mgcp-client: MGCP response: pass fmtp to caller

When receiving MGCP responses, so far libosmo-mgcp-client completely
ignored a=fmtp: parameters (like 'octet-align'). Add fmtp parsing to
pass the fmtp string to the caller as-is.

Since the responses so far never included the octet_aligned flags, do
not bother to parse fmtp to populate the legacy items. New callers
should use the fmtp string.

Change-Id: If8ca5c3880cad9e41b80e9d1c821439b0d7b7e23

.clang-format

@@ -0,0 +1,118 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# clang-format configuration file. Intended for clang-format >= 4.
+#
+# For more information, see:
+#
+#   Documentation/process/clang-format.rst
+#   https://clang.llvm.org/docs/ClangFormat.html
+#   https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+#
+---
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+#AlignEscapedNewlines: Left # Unknown to clang-format-4.0
+AlignOperands: true
+AlignTrailingComments: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: false
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterClass: false
+  AfterControlStatement: false
+  AfterEnum: false
+  AfterFunction: true
+  AfterNamespace: true
+  AfterObjCDeclaration: false
+  AfterStruct: false
+  AfterUnion: false
+  #AfterExternBlock: false # Unknown to clang-format-5.0
+  BeforeCatch: false
+  BeforeElse: false
+  IndentBraces: false
+  #SplitEmptyFunction: true # Unknown to clang-format-4.0
+  #SplitEmptyRecord: true # Unknown to clang-format-4.0
+  #SplitEmptyNamespace: true # Unknown to clang-format-4.0
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+#BreakBeforeInheritanceComma: false # Unknown to clang-format-4.0
+BreakBeforeTernaryOperators: false
+BreakConstructorInitializersBeforeComma: false
+#BreakConstructorInitializers: BeforeComma # Unknown to clang-format-4.0
+BreakAfterJavaFieldAnnotations: false
+BreakStringLiterals: false
+ColumnLimit: 120
+CommentPragmas: '^ IWYU pragma:'
+#CompactNamespaces: false # Unknown to clang-format-4.0
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 8
+ContinuationIndentWidth: 8
+Cpp11BracedListStyle: false
+DerivePointerAlignment: false
+DisableFormat: false
+ExperimentalAutoDetectBinPacking: false
+#FixNamespaceComments: false # Unknown to clang-format-4.0
+
+#IncludeBlocks: Preserve # Unknown to clang-format-5.0
+IncludeCategories:
+  - Regex: '.*'
+    Priority: 1
+IncludeIsMainRegex: '(Test)?$'
+IndentCaseLabels: false
+#IndentPPDirectives: None # Unknown to clang-format-5.0
+IndentWidth: 8
+IndentWrappedFunctionNames: false
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: ''
+MacroBlockEnd: ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+#ObjCBinPackProtocolList: Auto # Unknown to clang-format-5.0
+ObjCBlockIndentWidth: 8
+ObjCSpaceAfterProperty: true
+ObjCSpaceBeforeProtocolList: true
+
+# Taken from git's rules
+#PenaltyBreakAssignment: 10 # Unknown to clang-format-4.0
+PenaltyBreakBeforeFirstCallParameter: 30
+PenaltyBreakComment: 10
+PenaltyBreakFirstLessLess: 0
+PenaltyBreakString: 10
+PenaltyExcessCharacter: 100
+PenaltyReturnTypeOnItsOwnLine: 60
+
+PointerAlignment: Right
+ReflowComments: false
+SortIncludes: false
+#SortUsingDeclarations: false # Unknown to clang-format-4.0
+SpaceAfterCStyleCast: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+#SpaceBeforeCtorInitializerColon: true # Unknown to clang-format-5.0
+#SpaceBeforeInheritanceColon: true # Unknown to clang-format-5.0
+SpaceBeforeParens: ControlStatements
+#SpaceBeforeRangeBasedForLoopColon: true # Unknown to clang-format-5.0
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: false
+SpacesInContainerLiterals: false
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard: Cpp03
+TabWidth: 8
+UseTab: Always
+...

.gitignore

@@ -2,20 +2,13 @@ debian/*.log
 *.o
 *.lo
 *.a
+*.la
 .deps
 Makefile
 Makefile.in
 bscconfig.h
 bscconfig.h.in
-openbsc.pc
-src/osmo-nitb/osmo-nitb
-src/osmo-bsc_mgcp/osmo-bsc_mgcp
-src/osmo-bsc/osmo-bsc
-src/utils/meas_vis
-src/utils/meas_json
-src/utils/osmo-meas-pcap2db
-src/utils/osmo-meas-udp2db
-src/utils/smpp_mirror
+src/osmo-mgw/osmo-mgw
 *.*~
 *.sw?
 .libs
@@ -23,6 +16,7 @@ src/utils/smpp_mirror
 *.gcda
 *.gcno
 *.pc
+*~
 
 #configure
 aclocal.m4
@@ -46,32 +40,9 @@ m4/*.m4
 .version
 
 
-# apps and app data
-hlr.sqlite3
-src/utils/bs11_config
-src/ipaccess/ipaccess-config
-src/ipaccess/abisip-find
-src/ipaccess/ipaccess-firmware
-src/ipaccess/ipaccess-proxy
-src/utils/isdnsync
-src/nat/bsc_nat
-src/gprs/osmo-sgsn
-src/gprs/osmo-gbproxy
-src/gprs/osmo-gtphub
-src/osmo-bsc_nat/osmo-bsc_nat
-src/libcommon/gsup_test_client
-src/osmo-msc/osmo-msc
-
 #tests
 tests/testsuite.dir
 tests/*/*_test
-# ignore compiled binaries like msc_vlr_test_foo; do not ignore
-# msc_vlr_test_foo.{c,ok,err}, but do still ignore the corresponding .o object
-# files:
-tests/msc_vlr/msc_vlr_test_*
-!tests/msc_vlr/msc_vlr_test_*.*
-tests/msc_vlr/msc_vlr_test_*.o
-
 
 tests/atconfig
 tests/atlocal
@@ -79,10 +50,7 @@ tests/package.m4
 tests/testsuite
 tests/testsuite.log
 
-gsn_restart
-src/openbsc.cfg*
 writtenconfig/
-gtphub_restart_count
 
 # manuals
 doc/manuals/*.html
@@ -94,3 +62,10 @@ doc/manuals/generated/
 doc/manuals/osmomsc-usermanual.xml
 doc/manuals/common
 doc/manuals/build
+
+contrib/osmo-mgw.spec
+
+#vs code
+.cache
+.vscode
+

Makefile.am

@@ -9,10 +9,10 @@ AM_CPPFLAGS = \
 	$(NULL)
 
 SUBDIRS = \
-	doc \
 	include \
 	src \
 	tests \
+	doc \
 	contrib \
 	$(NULL)
 
@@ -22,7 +22,14 @@ pkgconfig_DATA = \
 	$(NULL)
 
 BUILT_SOURCES = $(top_srcdir)/.version
-EXTRA_DIST = git-version-gen osmoappdesc.py .version
+EXTRA_DIST = \
+	     .version \
+	     README.md \
+	     contrib/osmo-mgw.spec.in \
+	     debian \
+	     git-version-gen \
+	     osmoappdesc.py \
+	     $(NULL)
 
 AM_DISTCHECK_CONFIGURE_FLAGS = \
 	--with-systemdsystemunitdir=$$dc_install_base/$(systemdsystemunitdir)

README

@@ -1,24 +0,0 @@
-About OsmoMGW
-=============
-
-OsmoMGW originated from the OpenBSC project, which started as a minimalistic
-all-in-one implementation of the GSM Network. In 2017, OpenBSC had reached
-maturity and diversity (including M3UA SIGTRAN and 3G support in the form of
-IuCS and IuPS interfaces) that naturally lead to a separation of the all-in-one
-approach to fully independent separate programs as in typical GSM networks.
-
-OsmoMGW was one of the parts split off from the old openbsc.git. It originated
-as a solution to merely navigate RTP streams through a NAT, but has since
-matured to a Media Gateway implementation that is capable of streaming RTP for
-2G (AoIP) and 3G (IuCS) GSM networks as well as (still not implemented at time
-of writing) transcoding between TRAU, various RTP payloads and IuUP.
-
-The OsmoMGW program exposes an MGCP interface towards clients like OsmoMSC and
-OsmoBSC, and receives and sends RTP streams as configured via MGCP.
-
-The libosmo-mgcp-client library exposes utilities used by e.g. OsmoMSC (found
-in osmo-msc.git) to instruct OsmoMGW via its MGCP service.
-
-Find OsmoMGW issue tracker and wiki online at
-https://osmocom.org/projects/osmo-mgw
-https://osmocom.org/projects/osmo-mgw/wiki

README.md

@@ -0,0 +1,102 @@
+osmo-mgw - Osmocom MGW (Media GateWay) Implementation
+=====================================================
+
+This repository contains a C-language implementation of an MGW (Media
+GateWay) for use [not only] within the 2G (GSM) and/or 3G (UMTS)
+Cellular Network built using Osmocom CNI (Cellular Network
+Infrastructure) software.
+
+The OsmoMGW program provides an MGCP interface towards an MGCP call agent
+(client) like OsmoMSC and OsmoBSC, and receives and sends RTP streams as
+configured via the MGCP control plane.
+
+This Media Gateway implementation is capable of
+
+* streaming RTP for 2G (3GPP AoIP and Abis-over-IP)
+* streaming RTP for 3G (IuCS including the IuFP protocol)
+* TDM (E1/T1) based Abis interface with TRAU frames on 16k sub-slots
+* basic support for LCLS (Local Call, Local Switch) related features
+* various built-in translation capabilities
+  * between Abis TRAU frames and RTP formats
+  * between 2G AMR/RTP and 3G AMR/IuFP/RTP
+  * between bandwidth-efficient and octet-aligned AMR
+  * between different standards for encapsulating GSM HR codec frames in RTP
+
+osmo-mgw is typically co-located with
+
+ * osmo-bsc (GSM BSC)
+ * osmo-msc (GSM/UMTS MSC)
+ * osmo-hnbgw (UMTS HNBGW); osmo-mgw implements RTP relay between Iuh
+   and IuCS interfaces
+
+The libosmo-mgcp-client library exposes utilities used by e.g. OsmoMSC
+(found in osmo-msc.git) to instruct OsmoMGW via its MGCP service.
+
+Homepage
+--------
+
+You can find the OsmoMGW issue tracker and wiki online at
+<https://osmocom.org/projects/osmo-mgw> and <https://osmocom.org/projects/osmo-mgw/wiki>.
+
+
+GIT Repository
+--------------
+
+You can clone from the official osmo-mgw.git repository using
+
+        git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-mgw
+
+There is a web interface at <https://gitea.osmocom.org/cellular-infrastructure/osmo-mgw>
+
+
+Documentation
+-------------
+
+User Manuals and VTY reference manuals are [optionally] built in PDF form
+as part of the build process.
+
+Pre-rendered PDF version of the current "master" can be found at
+[User Manual](https://ftp.osmocom.org/docs/latest/osmomgw-usermanual.pdf)
+as well as the [VTY Reference Manual](https://ftp.osmocom.org/docs/latest/osmomgw-vty-reference.pdf)
+
+
+Mailing List
+------------
+
+Discussions related to osmo-mgw are happening on the
+openbsc@lists.osmocom.org mailing list, please see
+<https://lists.osmocom.org/mailman/listinfo/openbsc> for subscription
+options and the list archive.
+
+Please observe the [Osmocom Mailing List
+Rules](https://osmocom.org/projects/cellular-infrastructure/wiki/Mailing_List_Rules)
+when posting.
+
+
+Contributing
+------------
+
+Our coding standards are described at
+<https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards>
+
+We use a gerrit based patch submission/review process for managing
+contributions.  Please see
+<https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit> for
+more details
+
+The current patch queue for osmo-mgw can be seen at
+<https://gerrit.osmocom.org/#/q/project:osmo-mgw+status:open>
+
+
+History
+-------
+
+OsmoMGW originated from the OpenBSC project, which started as a minimalistic
+all-in-one implementation of the GSM Network. In 2017, OpenBSC had reached
+maturity and diversity (including M3UA SIGTRAN and 3G support in the form of
+IuCS and IuPS interfaces) that naturally lead to a separation of the all-in-one
+approach to fully independent separate programs as in typical GSM networks.
+
+OsmoMGW was one of the parts split off from the old openbsc.git. It originated
+as a solution to merely navigate RTP streams through a NAT, but has since
+matured.

README.vty-tests

@@ -1,6 +1,6 @@
 To run the configuration parsing and output (VTY) test suite, first install
 
-  git://git.osmocom.org/python/osmo-python-tests
+  https://gitea.osmocom.org/cellular-infrastructure/osmo-python-tests
 
 and pass the following configure options here:
 

TODO-RELEASE

@@ -24,3 +24,18 @@
 # If any interfaces have been removed or changed since the last public release, a=0.
 #
 #library		what		description / commit summary line
+libosmo-mgcp-client	remove public API	These public API items have not been called by any of our osmo-programs
+						for many years. Any sane caller of libosmo-mgcp-client should use the
+						higher level osmo_mgcpc_* API instead. Move these to a private header:
+						struct mgcp_response_head
+						struct mgcp_response
+						struct mgcp_msg
+						mgcp_response_parse_params()
+						mgcp_client_tx()
+						mgcp_client_cancel()
+						mgcp_msg_gen()
+						mgcp_msg_trans_id()
+libosmo-mgcp-client	deprecate public API	New code should no longer use codecs[], instead use ptmap[].codec. There
+						is backwards compat code that moves codecs[] entries, if any, over to
+						ptmap[], so callers may migrate at own leisure.
+osmo-mgw		remove cfg		Remove VTY config item 'sdp audio fmtp-extra' (see OS#6313)

configure.ac

@@ -9,6 +9,8 @@ AC_CONFIG_AUX_DIR([.])
 AM_INIT_AUTOMAKE([dist-bzip2])
 AC_CONFIG_TESTDIR(tests)
 
+CFLAGS="$CFLAGS -std=gnu11"
+
 dnl kernel style compile messages
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
@@ -22,6 +24,11 @@ AC_PROG_CC
 AC_PROG_INSTALL
 LT_INIT
 
+dnl patching ${archive_cmds} to affect generation of file "libtool" to fix linking with clang
+AS_CASE(["$LD"],[*clang*],
+  [AS_CASE(["${host_os}"],
+     [*linux*],[archive_cmds='$CC -shared $pic_flag $libobjs $deplibs $compiler_flags $wl-soname $wl$soname -o $lib'])])
+
 dnl check for pkg-config (explained in detail in libosmocore/configure.ac)
 AC_PATH_PROG(PKG_CONFIG_INSTALLED, pkg-config, no)
 if test "x$PKG_CONFIG_INSTALLED" = "xno"; then
@@ -29,20 +36,25 @@ if test "x$PKG_CONFIG_INSTALLED" = "xno"; then
 fi
 PKG_PROG_PKG_CONFIG([0.20])
 
-dnl check for AX_CHECK_COMPILE_FLAG
-m4_ifdef([AX_CHECK_COMPILE_FLAG], [], [
-	AC_MSG_ERROR([Please install autoconf-archive; re-run 'autoreconf -fi' for it to take effect.])
-	])
-
 dnl checks for libraries
 AC_SEARCH_LIBS([dlopen], [dl dld], [LIBRARY_DL="$LIBS";LIBS=""])
 AC_SUBST(LIBRARY_DL)
 
+AC_SEARCH_LIBS([dlsym], [dl dld], [LIBRARY_DLSYM="$LIBS";LIBS=""])
+AC_SUBST(LIBRARY_DLSYM)
 
-PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 1.0.0)
-PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm >= 1.0.0)
-PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 1.0.0)
-PKG_CHECK_MODULES(LIBOSMONETIF, libosmo-netif >= 0.4.0)
+
+PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 1.9.0)
+PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm >= 1.9.0)
+PKG_CHECK_MODULES(LIBOSMOCTRL, libosmoctrl >= 1.9.0)
+PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 1.9.0)
+PKG_CHECK_MODULES(LIBOSMONETIF, libosmo-netif >= 1.4.0)
+PKG_CHECK_MODULES(LIBOSMOABIS, libosmoabis >= 1.5.0)
+PKG_CHECK_MODULES(LIBOSMOTRAU, libosmotrau >= 1.5.0)
+
+CFLAGS="$CFLAGS -DBUILDING_LIBOSMOMGCPCLIENT -pthread"
+CPPFLAGS="$CPPFLAGS -DBUILDING_LIBOSMOMGCPCLIENT -pthread"
+LDFLAGS="$LDFLAGS -pthread"
 
 AC_ARG_ENABLE(sanitize,
 	[AS_HELP_STRING(
@@ -68,32 +80,13 @@ AC_ARG_ENABLE(werror,
 if test x"$werror" = x"yes"
 then
 	WERROR_FLAGS="-Werror"
+	WERROR_FLAGS+=" -Werror=implicit-int -Werror=int-conversion -Werror=old-style-definition"
 	WERROR_FLAGS+=" -Wno-error=deprecated -Wno-error=deprecated-declarations"
 	WERROR_FLAGS+=" -Wno-error=cpp" # "#warning"
 	CFLAGS="$CFLAGS $WERROR_FLAGS"
 	CPPFLAGS="$CPPFLAGS $WERROR_FLAGS"
 fi
 
-dnl Checks for typedefs, structures and compiler characteristics
-
-# The following test is taken from WebKit's webkit.m4
-saved_CFLAGS="$CFLAGS"
-CFLAGS="$CFLAGS -fvisibility=hidden "
-AC_MSG_CHECKING([if ${CC} supports -fvisibility=hidden])
-AC_COMPILE_IFELSE([AC_LANG_SOURCE([char foo;])],
-      [ AC_MSG_RESULT([yes])
-        SYMBOL_VISIBILITY="-fvisibility=hidden"],
-        AC_MSG_RESULT([no]))
-CFLAGS="$saved_CFLAGS"
-AC_SUBST(SYMBOL_VISIBILITY)
-
-AX_CHECK_COMPILE_FLAG([-Werror=implicit], [CFLAGS="$CFLAGS -Werror=implicit"])
-AX_CHECK_COMPILE_FLAG([-Werror=maybe-uninitialized], [CFLAGS="$CFLAGS -Werror=maybe-uninitialized"])
-AX_CHECK_COMPILE_FLAG([-Werror=memset-transposed-args], [CFLAGS="$CFLAGS -Werror=memset-transposed-args"])
-AX_CHECK_COMPILE_FLAG([-Werror=null-dereference], [CFLAGS="$CFLAGS -Werror=null-dereference"])
-AX_CHECK_COMPILE_FLAG([-Werror=sizeof-array-argument], [CFLAGS="$CFLAGS -Werror=sizeof-array-argument"])
-AX_CHECK_COMPILE_FLAG([-Werror=sizeof-pointer-memaccess], [CFLAGS="$CFLAGS -Werror=sizeof-pointer-memaccess"])
-
 # Coverage build taken from WebKit's configure.in
 AC_MSG_CHECKING([whether to enable code coverage support])
 AC_ARG_ENABLE(coverage,
@@ -121,7 +114,7 @@ if test "x$enable_ext_tests" = "xyes" ; then
 	AM_PATH_PYTHON
 	AC_CHECK_PROG(OSMOTESTEXT_CHECK,osmotestvty.py,yes)
 	 if test "x$OSMOTESTEXT_CHECK" != "xyes" ; then
-		AC_MSG_ERROR([Please install git://osmocom.org/python/osmo-python-tests to run the VTY/CTRL tests.])
+		AC_MSG_ERROR([Please install https://gitea.osmocom.org/cellular-infrastructure/osmo-python-tests to run the VTY/CTRL tests.])
 	fi
 fi
 AC_MSG_CHECKING([whether to enable VTY/CTRL tests])
@@ -196,9 +189,11 @@ AC_OUTPUT(
     libosmo-mgcp-client.pc
     include/Makefile
     include/osmocom/Makefile
+    include/osmocom/sdp/Makefile
     include/osmocom/mgcp_client/Makefile
     include/osmocom/mgcp/Makefile
     src/Makefile
+    src/libosmo-sdp/Makefile
     src/libosmo-mgcp-client/Makefile
     src/libosmo-mgcp/Makefile
     src/osmo-mgw/Makefile
@@ -206,9 +201,11 @@ AC_OUTPUT(
     tests/atlocal
     tests/mgcp_client/Makefile
     tests/mgcp/Makefile
+    tests/sdp/Makefile
     doc/Makefile
     doc/examples/Makefile
     doc/manuals/Makefile
     contrib/Makefile
     contrib/systemd/Makefile
+    contrib/osmo-mgw.spec
     Makefile)

contrib/ipa.py

@@ -15,10 +15,6 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 """
 

contrib/jenkins.sh

@@ -36,7 +36,6 @@ osmo-build-dep.sh libosmo-netif
 # Additional configure options and depends
 CONFIG=""
 if [ "$WITH_MANUALS" = "1" ]; then
-	osmo-build-dep.sh osmo-gsm-manuals
 	CONFIG="--enable-manuals"
 fi
 
@@ -50,17 +49,18 @@ set -x
 
 cd "$base"
 autoreconf --install --force
-./configure --enable-vty-tests --enable-external-tests --enable-werror $CONFIG
+./configure --enable-sanitize --enable-vty-tests --enable-external-tests --enable-werror $CONFIG
 $MAKE $PARALLEL_MAKE
 LD_LIBRARY_PATH="$inst/lib" $MAKE check \
   || cat-testlogs.sh
 LD_LIBRARY_PATH="$inst/lib" \
   DISTCHECK_CONFIGURE_FLAGS="--enable-vty-tests --enable-external-tests $CONFIG" \
-  $MAKE distcheck \
+  $MAKE $PARALLEL_MAKE distcheck \
   || cat-testlogs.sh
 
 if [ "$WITH_MANUALS" = "1" ] && [ "$PUBLISH" = "1" ]; then
 	make -C "$base/doc/manuals" publish
 fi
 
+$MAKE $PARALLEL_MAKE maintainer-clean
 osmo-clean-workspace.sh

contrib/osmo-mgw.spec.in

@@ -0,0 +1,122 @@
+#
+# spec file for package osmo-mgw
+#
+# Copyright (c) 2017, Martin Hauke <mardnh@gmx.de>
+#
+# All modifications and additions to the file contributed by third parties
+# remain the property of their copyright owners, unless otherwise agreed
+# upon. The license for this file, and modifications and additions to the
+# file, is the same license as for the pristine package itself (unless the
+# license for the pristine package is not an Open Source License, in which
+# case the license is the MIT License). An "Open Source License" is a
+# license that conforms to the Open Source Definition (Version 1.9)
+# published by the Open Source Initiative.
+
+# Please submit bugfixes or comments via http://bugs.opensuse.org/
+#
+
+Name:           osmo-mgw
+Version:        @VERSION@
+Release:        0
+Summary:        Osmocom's Media Gateway for 2G and 3G circuit-switched mobile networks
+License:        AGPL-3.0-or-later AND GPL-2.0-or-later
+Group:          Hardware/Mobile
+URL:            https://osmocom.org/projects/osmo-mgw
+Source:         %{name}-%{version}.tar.xz
+BuildRequires:  automake >= 1.9
+BuildRequires:  libtool >= 2
+BuildRequires:  pkgconfig >= 0.20
+%if 0%{?suse_version}
+BuildRequires:  systemd-rpm-macros
+%endif
+BuildRequires:  pkgconfig(libosmo-netif) >= 1.4.0
+BuildRequires:  pkgconfig(libosmocore) >= 1.9.0
+BuildRequires:  pkgconfig(libosmoctrl) >= 1.9.0
+BuildRequires:  pkgconfig(libosmogsm) >= 1.9.0
+BuildRequires:  pkgconfig(libosmovty) >= 1.9.0
+BuildRequires:  pkgconfig(libosmocoding) >= 1.9.0
+BuildRequires:  pkgconfig(libosmoabis) >= 1.5.0
+BuildRequires:  pkgconfig(libosmotrau) >= 1.5.0
+%{?systemd_requires}
+
+%description
+OsmoMGW is Osmocom's Media Gateway for 2G and 3G circuit-switched mobile networks.
+
+%package -n libosmo-mgcp-client12
+Summary:        Osmocom's Media Gateway Control Protocol client library
+Group:          System/Libraries
+
+%description -n libosmo-mgcp-client12
+Osmocom's Media Gateway Control Protocol client library.
+
+%package -n libosmo-mgcp-client-devel
+Summary:        Development files for Osmocom's Media Gateway Control Protocol client library
+Group:          Development/Libraries/C and C++
+Requires:       libosmo-mgcp-client12 = %{version}
+
+%description -n libosmo-mgcp-client-devel
+Osmocom's Media Gateway Control Protocol client librarary.
+
+This subpackage contains libraries and header files for developing
+applications that want to make use of libosmo-mgcp-client.
+
+%prep
+%setup -q
+
+%build
+echo "%{version}" >.tarball-version
+autoreconf -fi
+%configure \
+  --disable-static \
+  --docdir=%{_docdir}/%{name} \
+  --with-systemdsystemunitdir=%{_unitdir}
+
+make %{?_smp_mflags}
+
+%install
+%make_install
+find %{buildroot} -type f -name "*.la" -delete -print
+
+%check
+make %{?_smp_mflags} check || (find . -name testsuite.log -exec cat {} +)
+
+%post   -n libosmo-mgcp-client12 -p /sbin/ldconfig
+%postun -n libosmo-mgcp-client12 -p /sbin/ldconfig
+
+%if 0%{?suse_version}
+%preun
+%service_del_preun osmo-mgw.service
+
+%postun
+%service_del_postun osmo-mgw.service
+
+%pre
+%service_add_pre osmo-mgw.service
+
+%post
+%service_add_post osmo-mgw.service
+%endif
+
+%files
+%license COPYING
+%doc AUTHORS README.md
+%dir %{_docdir}/%{name}/examples
+%dir %{_docdir}/%{name}/examples/osmo-mgw
+%{_docdir}/%{name}/examples/osmo-mgw/osmo-mgw.cfg
+%{_docdir}/%{name}/examples/osmo-mgw/osmo-mgw-abis_e1.cfg
+%{_bindir}/osmo-mgw
+%{_unitdir}/osmo-mgw.service
+%dir %{_sysconfdir}/osmocom
+%config(noreplace) %{_sysconfdir}/osmocom/osmo-mgw.cfg
+
+%files -n libosmo-mgcp-client12
+%{_libdir}/libosmo-mgcp-client.so.12*
+
+%files -n libosmo-mgcp-client-devel
+%{_libdir}/libosmo-mgcp-client.so
+%{_libdir}/pkgconfig/libosmo-mgcp-client.pc
+%dir %{_includedir}/osmocom
+%dir %{_includedir}/osmocom/mgcp_client
+%{_includedir}/osmocom/mgcp_client/*.h
+
+%changelog

contrib/systemd/osmo-mgw.service

@@ -1,11 +1,21 @@
 [Unit]
 Description=Osmocom Media Gateway (MGW)
+After=network-online.target
+Wants=network-online.target
 
 [Service]
 Type=simple
+LimitNOFILE=65536
+StateDirectory=osmocom
+WorkingDirectory=%S/osmocom
 Restart=always
 ExecStart=/usr/bin/osmo-mgw -s -c /etc/osmocom/osmo-mgw.cfg
 RestartSec=2
+# CPU scheduling policy:
+CPUSchedulingPolicy=rr
+# For real-time scheduling policies an integer between 1 (lowest priority) and 99 (highest priority):
+CPUSchedulingPriority=1
+# See sched(7) for further details on real-time policies and priorities
 
 [Install]
 WantedBy=multi-user.target

debian/changelog

@@ -1,3 +1,690 @@
+osmo-mgw (1.12.1) unstable; urgency=medium
+
+  [ Pau Espin Pedrol ]
+  * mgcp-client: Fix missing include in mgcp_client_pool.h
+  * mgcp-client: Introduce API osmo_mgcpc_ep_local_name()
+  * mgw: Configure IuUP if codec set during MDCX
+
+ -- Oliver Smith <osmith@sysmocom.de>  Thu, 28 Sep 2023 15:58:17 +0200
+
+osmo-mgw (1.12.0) unstable; urgency=medium
+
+  [ Philipp Maier ]
+  * mgcp_sdp: add spec reference
+  * mgcp_sdp: cosmetic: remove newline
+  * mgcp_endp: cosmetic move mgcp_endp_release to the end
+  * mgcp_endp: cosmetic: remove unnecessary new line
+  * mgcp_e1: fix log output
+  * mgcp_e1: be more frugal withe E1 line resources
+  * mgcp_client: fix sourcecode formatting
+  * mgcp_e1: fix typo
+  * mgcp_e1: rewrite comment
+  * mgcp_e1: rename e1_send to e1_send_ts_frame
+  * mgcp_e1: cosmetic: rewrite comment
+  * Revert "mgcp_codec: do not differentiate between oa and bwe when comparing codec"
+  * mgcp_codec: fix oa/bwe comparison in mgcp_codec_pt_translate()
+  * mgcp_codec: refactor payload type converstion
+  * mgcp_codec: cosmetic: remove line break in api-doc
+  * mgcp_network: fix apidoc
+  * mgcp_vty: add warnings for deprecated config options
+  * mgcp_codec: move mgcp_codec_decide down
+  * mgcp_codec: fix codec decision
+  * mgcp_network: do not deliver RTP packets with unpatched PT
+  * mgcp_codec: be sensitive about IuFP when checking codecs
+  * mgcp_client.h: also add spec ref to the other 3gpp defined payload types
+
+  [ Harald Welte ]
+  * cosmetic: Fix grammar suggesting reading _the_ user manual
+
+  [ arehbein ]
+  * Transition to use of 'telnet_init_default'
+
+  [ Oliver Smith ]
+  * mgcp_client: mgcp_msg_gen: add more error logs
+  * mgcp_client_pool: add mgcp_client_pool_empty()
+  * Cosmetic: mgcp_client: fix typo
+  * debian: set compat level to 10
+  * systemd: depend on networking-online.target
+  * Cosmetic: fix a typo
+  * mgcp_client: check rc of map_str_to_codec
+
+  [ Pau Espin Pedrol ]
+  * mgcp_network: Unregister osmo_fd before closing fd
+  * mgcp-client: Call osmo_fd_unregister() before closing and changing bfd->fd
+  * mgcp-client: Drop unused struct mgcp_client field
+  * mgcp_client: Introduce mgcp_client_conf_alloc(), deprecate mgcp_client_conf_init()
+  * mgcp-client: Move some static functions further above
+  * mgw: Allow auditing speciall 'null' endpoint
+  * mgcp-client: Add keepalive feature
+  * mgcp_client: pool: Only pick clients with an MGCP link considered to be UP
+  * mgcp-client: Always mark client as UP if keepalive request-interval disabled
+  * mgcp-client: Mark client as UP when keepalive request-interval/timeout is disabled through VTY
+
+  [ Vadim Yanitskiy ]
+  * */Makefile.am: libraries shall not be in AM_LDFLAGS
+  * tests: use -no-install libtool flag to avoid ./lt-* scripts
+  * tests: $(BUILT_SOURCES) is not defined, depend on osmo-mgw
+  * copyright: fix typo: sysmocom s/s.m.f.c./s.f.m.c./ GmbH
+
+  [ Neels Hofmeyr ]
+  * mgcp_find_section_end(): skip spaces at start of SDP
+  * mgcp_client: simpler error handling
+  * mgcp: fix "L: a:" header parsing: heed ";" separator
+  * mgcp_client: tweak extract_codec_name() implementation
+
+  [ Andreas Eversberg ]
+  * ASCI: Add new mode for voice group/broadcast call
+  * ASCI: Support conference briding with 1..n connections
+
+ -- Pau Espin Pedrol <pespin@sysmocom.de>  Tue, 12 Sep 2023 14:48:51 +0200
+
+osmo-mgw (1.11.0) unstable; urgency=medium
+
+  [ Pau Espin Pedrol ]
+  * mgcp-client: Remove impossible code path
+  * mgcp_osmux: Drop duplicated conn_osmux_release_cid() in code path
+  * Use Osmux default port define from libosmo-netif
+  * osmux: Use new osmux APIs to let libosmo-netif alloc struct osmux_out_handle
+  * mgw: Fix osmux conn local IP selection
+  * cosmetic: osmux: Fix wrong indentation
+  * mgw: Use X-Osmux string define
+  * Add Osmux log category
+  * cosmetic: main: Properly format log_info_cat
+  * osmux: Use better name for function which may allocate a new struct
+  * osmux: Use osmo_sockaddr wherever possible
+  * osmux: Log refcounting of osmux_handle_list
+  * osmux: Fix memleak on error code path
+  * osmux: don't store conn ptr inside shared osmux_handle
+  * osmux: set log level of expected code path to INFO
+  * cosmetic: vty: Fix indentation whitespace
+  * osmux: Log sendto() error
+  * cosmetic: mgcp_conn.h: fix indentation whitespace
+  * osmux: Attach osmux to virtual trunk
+  * osmux: Clean up helper macro osmux_chunk_length()
+  * osmux: Get rid of static NULL talloc context
+  * Fix typo in ratectr description
+  * mgcp_conn: rename field s/rate_ctr_group/ctrg/g
+  * Use 'static const' instead of 'const static' everywhere
+  * osmux: Add connection and global rate counters
+  * cosmetic: osmux: Fix formatting of if-else brackets
+  * osmux: Rename field osmux usage policy and define it with proper type
+  * Use bool type instead of int in config field
+  * osmux: Support local CID != remote CID
+  * osmux: Fix incorrect rate_ctr_group used in mgcp_osmux.c
+  * osmux: Improve per-conn tx rate counters
+  * vty: show per-connection Osmux VTY stats
+  * osmux: Rename field s/init/initialized
+  * osmux: Allocate rate counters during initialization of osmux conn
+  * cosmetic: osmux: Drop extra empty line
+  * osmux: Drop unneeded comment block
+  * osmux: Lower log level when osmux batch received for unknown CID
+  * osmux: Keep decoding osmux pkt if a batch contains an unknown CID
+  * Allocate struct osmux_in_handle through new libosmo-netif APIs
+  * osmux: Drop logging of osmux internal counters
+  * osmux: cleanup misleading code calling rtp_bridge_cb
+  * osmux: Unify rtp_conn osmux type into a single type
+  * osmux: Match remote address in osmux_conn_lookup()
+  * osmux: Fill in from_addr in struct osmo_rtp_msg_ctx
+  * osmux: Log remote address upon rx of osmux pkt
+  * send_dummy: Use proper condition to test if conn is osmux
+  * Fix regression in detection of legacy dummy packets
+  * Use new libosmocore API osmo_sockaddr_is_any()
+  * Get rid of separate rtp_port field
+  * osmux: Use available API to check if remote end is known
+  * Add Osmux IPv6 support
+  * Clean up local var pointers in mgcp_get_local_addr()
+  * osmux: Change couple log lines to OSMUX category
+  * osmux: Add square brackets around IPv6 address to distinguish port in log line
+  * osmux: Drop unused role parameter
+  * osmux: cosmetic: Fix indentation
+  * Check once if remote addr is available when sending dummy packet
+  * osmux: Simplify and constify param passing
+  * osmux: Set conn->type during osmux_init_conn()
+  * osmux: Make conn_osmux_{allocate,release}_local_cid() APIs static
+  * osmux: Define osmux_dummy cfg as boolean
+  * osmux: Move setting OSMUX_STATE_DISABLED to initializer function
+  * osmux: Erase references to bsc-nat
+  * mgcp_conn_dump(): Separate dump for osmux and iuup connections
+  * osmux: Introduce osmux peer-behind-nat (on|off) and rework conn activation
+  * osmux: Clean up mgcp_config osmux fields
+  * cosmetic: Fix typo in comment
+  * mgcp-client: pool: Improve documentation of some internal fields
+  * mgcp-client: Avoid double iteration picking client from pool
+  * mgcp-client: Fix typo in internal function name
+  * mgcp-client: Rename internal field in mgcp_client_pool
+  * mgcp-client: Move & rename helper function outside of vty code
+  * mgcp-client: Create alloc() and free() internal APIs for mgcp_client_pool_member
+  * mgcp-client: Move internal API acting on mgcp_client_pool to the correct file section
+  * mgcp-client: Refactor reinit of mgcp clients
+  * mgcp-client: Rearrange order of structs and APIs in header
+  * mgcp-client: Rearrange internal backpointers
+  * mgcp-client: Introduce APIs to manually select mgcp_client from pool
+  * mgcp-client: vty: Write deprecation warning using non-mgw nodes
+  * mgcp-client: Use random free local port by default
+  * mgcp-client: Convert users supporting new MGW Pool VTY node during write-config
+  * mgcp-client: Introduce API mgcp_client_pool_config_write
+  * mgcp-client: Add new VTY commands under mgw node without mgw prefix
+  * mgcp-client: Fix 'mgw endpoint-range' command dropped from old VTY node
+  * mgcp-client: Refactor system keeping old users not calling mgcp_client_pool_config_write() working
+  * mgcp-client: Fix no 'mgw ' prefix written in old VTY node
+  * Fix misleading error log
+  * mgcp_send: Use mgcp_conn_rtp_is_iuup() helper
+  * cosmetic: Clarify and fix typos in comment
+  * mgw: Log unexpected RTP AMR OA-vs-BE payload
+  * Rename and move func checking if amr mode is explicitly configured
+  * mgw: rx_rtp(): reorder checks and handlings
+  * mgw: Rename s/mgcp_send_rtp/mgcp_conn_rtp_dispatch_rtp/
+  * osmux: Rename function and pass msgb directly to it
+  * osmux: Make sure RTP AMR feed to osmux is in octet-aligned mode
+  * Improve logging on AMR OA<->BWE conversion failure
+  * osmux: Rotate over available Osmux CID when allocating a new one
+  * osmux: Use new osmux_xfrm_input API to set name on each link
+  * iuup: Use osmo_amr_ft_valid() API
+
+  [ Vadim Yanitskiy ]
+  * libosmo-mgcp-client: add -no-undefined to *_la_LDFLAGS
+
+  [ Philipp Maier ]
+  * mgcp_e1: fix apidoc
+  * mgcp_network: improve coment
+
+  [ Max ]
+  * Set working directory in systemd service file
+  * Add realtime scheduling and set priority in service file
+  * ctrl: take both address and port from vty config
+
+  [ Harald Welte ]
+  * Make osmo_mgcpc_ep_fsm_pre_term() static
+  * Support building with -Werror=strict-prototypes / -Werror=old-style-definition
+  * Add -Werror=implicit-int -Werror=int-conversion -Werror=old-style-definition
+  * update outdated vty copyright statement
+
+  [ Oliver Smith ]
+  * mgcp_client_pool.h: add missing stdbool include
+  * Fix various typos
+  * mgcp_client: add new clearmode codec
+
+  [ Neels Hofmeyr ]
+  * AMR->IuUP: do not crash on AMR data before IuUP Init
+  * AMR->IuUP: properly translate Q -> FQC
+  * IuUP->AMR: do not patch payload type a second time
+  * IuUP->AMR: log whether converting to AMR OA or BE
+  * AMR->IuUP: log conversion, like for the flipside
+
+ -- Pau Espin Pedrol <pespin@sysmocom.de>  Tue, 07 Feb 2023 16:58:41 +0100
+
+osmo-mgw (1.10.0) unstable; urgency=medium
+
+  [ Eric ]
+  * adjust mgcp response context
+  * rework message handling
+  * add a lock-free bounded spsc interthread queue
+  * clang-format: remove foreach macros
+  * fix mgcp_conn_free_all ubsan complaints
+
+  [ Philipp Maier ]
+  * configuration: point out difference between trunk-nr and e1 line nr
+  * mgcp_client: add new codec IUFP as VND.3GPP.IUFP
+  * mgcp_codec: do not differentiate between oa and bwe when comparing codec
+  * mgcp_network: do not try to convert RTCP packets
+  * mgcp_network: fix typo RTPC -> RTCP
+
+  [ Oliver Smith ]
+  * treewide: remove FSF address
+
+  [ Pau Espin Pedrol ]
+  * mgcp_network.c: Set proper CRC Header for ACK Initialization
+  * cosmetic: Rename variable payload=>payload_type
+  * mgcp_network.c: Fix byte alignment of CRC Header for ACK Initialization
+  * Define mgcp_rtp_end.output_enabled as bool
+  * cosmetic: mgcp_codec.c: Fix typo in comment
+  * Drop unneeded ax_check_compile_flag.m4
+  * Make function amr_is_octet_aligned publicly available
+  * Initial IuUP support using proper FSMs
+  * IuUP: Support RFCI ID != RFCI Index
+  * iuup: Fix caps in logging message
+  * iuup: Check for IuUP Initialization retrans
+
+  [ Alexander Couzens ]
+  * doc/overview: fix wrong project page link
+
+  [ Vadim Yanitskiy ]
+  * tests: use 'check_PROGRAMS' instead of 'noinst_PROGRAMS'
+  * libosmo-mgcp: e1: fix memleaks in e1_recv_cb()
+
+  [ Harald Welte ]
+  * update git URLs (git -> https; gitea)
+
+ -- Pau Espin Pedrol <pespin@sysmocom.de>  Tue, 28 Jun 2022 18:50:25 +0200
+
+osmo-mgw (1.9.0) unstable; urgency=medium
+
+  [ Harald Welte ]
+  * TOS bits != DSCP
+  * manual: don't define fig-bsc twice
+  * switch from osmo_sock_set_dscp() to OSMO_SOCK_F_DSCP()
+  * mgw: Add support for setting socket priority from VTY
+  * manual: Include QoS chapter and add osmo-mgw specific example
+
+  [ Keith ]
+  * Add vty command 'show mgcp active'
+  * Log some useful messages at ERROR/INFO instead of DEBUG
+
+  [ Neels Hofmeyr ]
+  * send DLCX only once
+  * tweak termination DLCX log msg
+  * add osmo_mgcpc_ep_ci_get_remote_rtp_info()
+  * check_rtp_destin(): clarify log msg
+  * mgcp_client_fsm delete: set mgcp_client as ctx, not NULL
+  * mgcp_client_endpoint_fsm: on term, still let conns wait for DLCX OK
+  * mgcp_client_fsm: add missing log_subsys
+  * mgcp_client: add logging on received MGCP messages
+
+  [ Philipp Maier ]
+  * mgcp_network: fix implicit address loopback
+  * mgcp_common, mgcp_udp_send: make parameter buf const
+  * mgcp_network: refactor MGCP_DUMMY_LOAD
+  * mgcp_client: drop nunnecessary else statement
+  * mgcp_client: fix error handling in mgcp message generation
+  * mgcp_protocol: fix loop that sends dummy RTP packets
+  * mgw_main: fix loop that resets all endpoints
+  * mgcp_trunk: drop ws line
+  * mgcp_ratectr: drop ws line
+  * mgcp_ratectr: fix sourcecode formatting
+  * mgcp_trunk: add value string for trunk type.
+  * mgcp_ratectr: refactor rate counter and set group name
+  * mgcp_protocol: forward declare mgcp_endpoint
+  * mgcp_endp: make wildcarded detection separate
+  * mgcp_protocol: refactor request handler array
+  * mgcp_trunk: use unsigned int instead of int as trunk_nr
+  * mgcp_protocol: refactor MGCP request handling
+  * mgcp_ratectr: add stats items to monitor trunk usage
+  * mgcp_msg: add trunk parameter to mgcp_check_param for logging
+  * mgcp_protocol: refactor function create_response_with_sdp
+  * mgcp_protocol: add support for wildcarded DLCX
+  * remove struct member wildcarded_req from struct mgcp_endpoint
+  * mgcp_lient: remove unsubstantial FIXME note
+  * mgcp_protocol: assert endp when it becomes mandatory
+  * mgcp_trunk: check MGW domain name earlier
+  * mgcp_ratectr: add stats items to monitor trunk usage
+  * mgcp_client: fix typo Initalize -> Initialize
+  * mgcp_protocol: get rid of policy_cb and change_cb
+  * mgcp_ratectr: do not set talloc destructor on library allocated item
+  * mgcp_client: allow to reset endpoints on startup
+  * mgcp_client_vty: remove unnecessary checks
+  * mgcp_client: do not print (null) when address is ANY
+  * mgcp_client: refactor function init_socket
+  * libosmo-mgcp-client: extend the mgcp_client for MGW pooling
+  * mgcp_client_vty: add missing docstrings
+  * mgcp_client_vty: add OSMO_ASSERT on pool parameter
+  * mgcp_client_vty: fix docstrings for mgw-pool
+  * mgcp_client_vty: cosmetic: doc string should terminated with \n
+  * mgcp_client_vty: fixing docstring
+  * mgcp_ratectr: remove unusued rate counters
+  * mgcp_client: fix typo in doxygen comment
+  * mgcp_client: add MGW name as logging context
+
+  [ Pau Espin Pedrol ]
+  * Use new stat item/ctr getter APIs
+  * constify arg in addr_is_any()
+  * Define patch_ssrc as bool type
+  * constify some function arg pointers
+  * mgcp_network.c: Reorder some functions in file
+  * mgcp_send_dummy: Check RTP destination is available before attempt tx
+  * mgw: rx CRCX: Avoid sending dummy rtp if remote address not provided
+  * Fail rx MDCX sendrecv with invalid remote addr
+  * Take into account Marker bit when patching RTP stream
+  * Use DLMGCP instead of DLGLOBAL in log lines
+  * Fix attribute parsing on gcc 11.1.0
+
+  [ neels ]
+  * Revert "mgcp_ratectr: add stats items to monitor trunk usage"
+
+  [ Daniel Willmann ]
+  * contrib/jenkins: Use ASAN for osmo-mgw
+
+  [ Oliver Smith ]
+  * mgcp_client_vty: add missing NO_STR
+  * Revert "Turn some compiler warnings into errors"
+
+  [ Eric ]
+  * add vscode stuff to gitignore
+  * configure.ac: fix maybe-uninitialized for clang
+  * fix missing includes and forward declarations
+  * rename do_retransmission
+  * mgcp_sdp: fix potential leak
+  * stats: make sanitizers happy
+  * libosmo-mgcp: cleanup audio codex alloc
+  * libosmo-mgcp: atomic rate counter group indexes
+  * libosmo-mgcp: do not use the default msgb talloc context
+  * globally lock the portrange when trying to grab a port to prep for multithreading
+  * embed strings into structs
+  * adjust talloc context
+  * endp: do not cache cfg pointer
+  * add modified .clang-format
+  * rename strip_epname and find_specific_endpoint and make them available
+  * fix mgcp_conn_free_all
+  * fix up some docstrings that lost their dot
+
+  [ Vadim Yanitskiy ]
+  * libosmo-mgcp: use OSMO_STRLCPY_ARRAY in mgcp_codec_add()
+
+ -- Pau Espin Pedrol <pespin@sysmocom.de>  Tue, 16 Nov 2021 16:59:21 +0100
+
+osmo-mgw (1.8.1) unstable; urgency=medium
+
+  * attempt to fix RPM spec file after recent soversion bump
+
+ -- Harald Welte <laforge@osmocom.org>  Wed, 24 Feb 2021 10:56:17 +0100
+
+osmo-mgw (1.8.0) unstable; urgency=medium
+
+  [ Harald Welte ]
+  * Fix number of endpoints of default trunk
+  * Add CTRL interface to osmo-mgw
+  * Update per-trunk global packet/byte counters in real-time
+  * remove accidential TODO-RELEASE entry
+  * mgcp_protocol: Avoid code duplication between virtual + other trunks
+  * osmo-mgw.spec.in: Use %config(noreplace) to retain current config file
+  * mgcp_client_init(): consider "talloc returns NULL" case
+  * mgcp_client_pending_add(): Consider "talloc returns NULL" case
+  * libosmo-mgcp-client: fix memleak in case if no response is received
+  * debian/control + SPEC: Add missing build dependency to libosmo-abis
+  * osmo-mgw.spec.in: Fix dependency to libosmoabis
+  * osmo-mgw.spec.in: Add missing dependency to libosmotrau
+  * Add example osmo-mgw configuration file for Abis/E1
+  * use osmo_fd_setup() whenever applicable
+
+  [ Neels Hofmeyr ]
+  * fix vty dump_trunk: start from zero, do not omit first CONN
+  * allow larger MGCP client wqueue: 10 -> 1024
+  * add osmo-mgw --vty-ref-xml: dump VTY ref XML to stdout
+  * manuals: generate vty reference xml at build time
+  * refactor: use msgb to receive, pass and send RTP packets
+  * change timer T2427001 to X2427
+
+  [ Philipp Maier ]
+  * doc: do not bind osmo-mgw to random ip-address
+  * cosmetic: remove excess newlines
+  * mgcp: remove unused callback pointer
+  * mgcp: find better locations for LOGPCONN and LOGPENDP
+  * vty: fix unreachable code (error msg on trunk alloc fail)
+  * mgcp_vty: fix indentation
+  * osmo-mgw: rename struct mgcp_trunk_config and symbol tcfg
+  * mgcp_vty: fix indentation in VTY config write
+  * osmo-mgw: refactor endpoint and trunk handling
+  * mgcp_trunk: remove audio_name and audio_payload
+  * ratectr: move rate counter definitions into mgcp_ratectr.h
+  * cosmetic: fix doxygen
+  * cosmetic: fix doxygen
+  * cosmetic: fix doxygen for mgcp_cleanup_rtp_bridge_cb()
+  * trunk: get rid of virt_trunk pointer
+  * cosmetic: remove excess space
+  * endp: move endpoint name generation into mgcp_endp.c
+  * endp: add name generator function for E1 endpoints
+  * mgcp_client: add docstring for mgcp_client_rtpbridge_wildcard()
+  * mgcp_trunk: fix docstring for mgcp_trunk_alloc()
+  * mgcp_osmux: remove unused define constants
+  * mgcp_trunk: move enum mgcp_trunk_type to mgcp_trunk.h
+  * mgcp_trunk: use enum type for trunk type variable
+  * trunk: parse E1 trunk number
+  * endp: add typeset for e1-endpoints
+  * mgcp_conn: move struct mgcp_conn mgcp_conn.h
+  * mgcp_internal: remove forward declaration struct mgcp_endpoint_type
+  * endp: add E1 endpoint interlocking
+  * endp: require domain name also for E1 endpoints
+  * mgcp_trunk: pick trunk by number and type
+  * mgcp_client: add function to generate e1-endpoint names
+  * mgcp_endp: use define constant to define max number of E1 subslots
+  * mgcp_endp.c: cosmetic: fix sourcecode formatting
+  * mgcp_trunk: remove double check
+  * mgcp_test: do not access endpoint array elements directly
+  * mgcp_vty: fix endpoint number configuration
+  * mgcp_test: remove trunk2 from unit-test
+  * mgcp_trunk: use talloc_zero_array instead of _talloc_zero_array
+  * mgcp_protocol: remove unused variable
+  * mgcp_e1: finish E1 support, add E1 support from libosmoabis
+  * get rid of mgcp_internal.h
+  * mgcp_ratectr: fix comments in header file
+  * mgcp_e1: use return value of e1inp_line_update()
+  * mgcp_protocol: log when endpoint is unavailable
+  * cosmetic: add missing new-line
+  * mgcp_trunk: drop "trunk 0" limitation
+  * mgcp_e1: make E1 ts initalization more debugable
+  * mgcp_e1: remove unused struct member trunk->e1.line
+  * mgcp_endp: use NUM_E1_TS from e1_input.h
+  * mgcp_trunk: increase default number of virtual endpoints
+  * cosmetic: mgcp_client_fsm: change error message.
+  * mgcp_vty: remove remains of loopback functionality
+  * mgcp_vty: deprecate bind early command
+  * mgcp_e1: do not expose function  mgcp_e1_init()
+  * mgcp_vty: add user attributes to configuration commands
+  * overview: update section limitations.
+  * overview: fix graph "OsmoMGW used with OsmoBSC"
+  * overview: fix graph "OsmoMGW used with OsmoMSC"
+  * overview: add graph to show E1 integration
+  * configuration: remove hint towards trunk 0 limit
+  * configuration: drop note about lackin E1 support
+  * configuration: add note that changes to trunks need a restart
+  * mgcp_vty: fix config write for trunk 0
+  * mgcp_vty: add missing VTY commands for E1 trunks
+  * mgcp_trunk: get rid of magic numbers for E1 slots
+  * configuration: add section about E1 trunks
+  * usermanual: add chapter about mgcp endpoints
+  * mgcp_client: get rid of magic numbers for E1 slots
+
+  [ Eric ]
+  * tests: dlopen does not imply availability of dlsym..
+  * configure.ac: fix libtool issue with clang and sanitizer
+
+  [ Alexander Chemeris ]
+  * vty: Prepend VTY output of counters for better visual separation.
+  * counters: Implement more useful counters.
+  * mgcp_network: Fix a typo in the comment bahviour -> behaviour
+  * rtp_bridge: Demote a chatty ERROR log message to DEBUG level.
+
+  [ Pau Espin Pedrol ]
+  * Use OSMO_FD_* instead of deprecated BSC_FD_*
+  * Support setting rt-prio and cpu-affinity mask through VTY
+  * cosmetic: Rename main talloc ctx
+  * mgcp-client: Support IPv6 in osmo_mgcpc_ep_ci_get_crcx_info_to_sockaddr() implementation
+  * mgcp-client: Fix trailing whitespace in mgcp_client_fsm.h
+  * mgcp_client: Use INET6_ADDRSTRLEN to store addresses in str format
+  * mgcp_client: Allow submitting and parsing IPv6 addr in SDP
+  * mgcp_client: Allow setting IPv6 addresses
+  * mgcp_client: Make MGCP_CLIENT_LOCAL_ADDR_DEFAULT IPv6 compatible
+  * mgcp_client: Support validating IPv6 addresses in CRCX and MDCX commands
+  * mgcp_client: Deprecate unused IPv4-only API
+  * mgcp_client: copy back Connection Information from MDCX ACK
+  * mgw: Fix mgcp_rtp_end field description comment
+  * mgw: Initial IPv6 support
+  * mgw: Introduce VTY cmd 'rtp bind-ip-v6' command
+  * mgw: Find and store RTP conn local_addr once during CRCX handling
+  * mgw: Announce and rebind new local address if change required during MDCX
+  * mgw: osmux: Avoid sending packets on recvonly connection
+  * mgw: Release endpoint after last conn times out
+  * mgw: osmux: Fix conn watchdog timeout not updated
+  * mgw: Don't be case-sensitive when parsing X-Osmo-IGN param
+  * cosmetic: Fix typo in comment
+  * mgw: Avoid logging notice message each time we receive nt param in LCO
+  * mgw: Fix return value documentation for API mgcp_verify_call_id
+  * cosmetic: Fix typo in comment
+  * contrib/jenkins: Enable parallel make in make distcheck
+  * .gitignore: Ignore new autofoo tmp files
+  * tests: Replace deprecated API log_set_print_filename
+
+  [ Oliver Smith ]
+  * contrib: import RPM spec
+  * contrib: integrate RPM spec
+  * Makefile.am: EXTRA_DIST: debian, contrib/*.spec.in
+  * contrib/jenkins: don't build osmo-gsm-manuals
+  * configure.ac: set -std=gnu11
+
+  [ Vadim Yanitskiy ]
+  * libosmo-mgcp-client: fix use-after-free in mgcp_client_tx()
+  * libosmo-mgcp-client: fix use-after-free in mgcp_msg_gen()
+  * libosmo-mgcp: fix unsigned compared against 0 in mgcp_trunk_by_name()
+  * libosmo-mgcp: fix unused extra argument to printf() in add_fmtp()
+  * libosmo-mgcp: always check result of msgb_printf() in add_fmtp()
+  * libosmo-mgcp-client: mgcp_client_tx(): return rc on error
+  * debian/control: change maintainer to the Osmocom team / mailing list
+  * vty: use install_lib_element() and install_lib_element_ve()
+  * main: add --vty-ref-mode, use vty_dump_xml_ref_mode()
+  * fixup mgcp_trunk: increase default number of virtual endpoints
+
+  [ Alexander Couzens ]
+  * configure.ac: require libosmoabis + libosmotrau >= 1.0.0
+
+ -- Pau Espin Pedrol <pespin@sysmocom.de>  Tue, 23 Feb 2021 18:28:45 +0100
+
+osmo-mgw (1.7.0) unstable; urgency=medium
+
+  [ Neels Hofmeyr ]
+  * rename codecs_cmp() to codecs_same()
+  * mgcp_codec: constify 'param' arg
+  * fix crashes: don't assert on incoming RTP packet size
+  * mgcp_send(): stop looping on conversion error
+  * mgcp_codec: split codec_free() off of codec_init()
+  * fix memleak: actually free strings in mgcp_codec_reset_all()
+  * mgcp_test: extend / rewrite test_mgcp_codec_pt_translate()
+  * test_mgcp_codec_pt_translate(): more tests
+  * differentiate AMR octet-aligned=0 vs =1
+  * ptmap: implicitly match  '/8000' and '/8000/1'
+  * mgcp_codec: codec_set(): log about all possible errors
+  * mgcp_codec_add: fix audio_name size check
+  * explicitly free codecs in mgcp_rtp_conn_cleanup()
+  * tweak mgcp_parse_audio_ptime_rtpmap()
+  * SDP: store all ptmap entries
+  * mgcp_client_fsm cleanup: Do not assert on DLCX failure
+  * clear pending requests on MGCP failure
+  * client: endp fsm: add notify struct, prep for cancel-notify
+  * client: endp fsm: clear ci[] before dispatching DLCX success
+  * client: endp fsm: allow cancelling a notify event
+  * client: endp fsm: add osmo_mgcpc_ep_ci_ep()
+  * accept MGCP without SDP
+  * fix use-after-free: require new fsm deferred dealloc, check for term
+
+  [ Pau Espin Pedrol ]
+  * mgcp_test: Correctly release all endpoints allocated
+  * mgw: Allocate mgcp_conn instance under tcfg->endpoints
+
+  [ Harald Welte ]
+  * manual: Fix copy+paste error
+  * mgcp_client: Check for osmo_fsm_register() error return value
+  * Move fsm_mgcp_client regstration to __attribute__((contructor))
+  * exit(2) on unsupported positional arguments on command line
+
+  [ Oliver Smith ]
+  * osmoappdesc.py: switch to python 3
+
+ -- Pau Espin Pedrol <pespin@sysmocom.de>  Fri, 03 Jan 2020 13:35:09 +0100
+
+osmo-mgw (1.6.0) unstable; urgency=medium
+
+  [ Oliver Smith ]
+  * Cosmetic: fix spaces/tabs in mgcp_requests[]
+  * Inactive connection cleanup (disabled by default)
+  * debian: create -doc subpackage with pdf manuals
+  * vty: allow 0 as conn-timeout to disable it
+  * vty: update desc of conn-timeout
+  * manuals: update VTY documentation
+  * "make dist" fix for: no rule to make mgcp_common.h
+  * contrib/jenkins.sh: run "make maintainer-clean"
+
+  [ Philipp Maier ]
+  * Add option to GSM HR frames to RFC5593 representation
+  * mgcp_sdp: cosmetic: correct typo in comment
+  * mgco_client: cosmetic: remove excess whitespace
+  * mgcp_sdp: mgcp_sdp.c does not include own header file
+  * mgcp_sdp: untangle parsing of a= parameters
+  * mgcp_network: use mgcp_rtp_codec in downlink format callback
+  * AMR: Add function to convert between bw-effient and octet aligned mode
+
+  [ Neels Hofmeyr ]
+  * log: don't spam with "can not patch PT" messages
+  * mgcp client: allow setting conn mode for CRCX and MDCX
+  * make codec_table public as osmo_mgcpc_codec_names
+  * move MGW endpoint FSM from osmo-bsc to here
+  * fix: multiple initial CRCX
+  * constify map_codec_to_pt() ptmap arg
+
+  [ Pau Espin Pedrol ]
+  * mgcp-client: whitespace cleanup in mgcp_client.c
+  * mgcp-client: Sanitize implementation of mgcp_client_rtpbridge_wildcard
+  * libosmo-mgcp: Use trunk type during endpoint allocation
+  * cosmetic: Fix typos in comment
+  * cosmetic: tests: mgcp_client_test: clean trailing whitespace
+  * mgcp_msg: Log faulty line on Osmux parsing error
+  * cosmetic: handle_modify_con: Fix indentation level
+  * Introduce log fmt helpers LOGPENDP and LOGPCONN
+  * create_response_with_sdp: Fix inclusion of X-Osmux
+  * osmux: Cleanup of CID alloc pool APIs
+  * mgcp_osmux.c: osmux_enable_endpoint: Fix incorrect return check
+  * osmux: Log osmux socket during osmux_init
+  * mgcp-cli: Change osmo_mgcpc_ep_fsm name to avoid collision with old osmo-bsc
+  * osmux: Document func and return different rc upon osmux init failure
+  * osmux: Fix reception of legacy dummy payloads
+  * osmux: Use LOGPCONN in several log calls
+  * cosmetic: mgcp_udp_send: Document port param is in network byte order
+  * cosmetic: osmux: Document network byte order in port variable
+  * vty: Allow enabling Osmux
+  * osmux: Allocate CID during CRCX
+  * osmux: Introduce mgcp_conn_rtp_is_osmux() helper
+  * osmux: Mark conn_rtp->type as osmux during CRCX
+  * mgcp-cli: Allow submitting X-Osmux on CRCX request
+  * mgcp-cli: Parse X-Osmux on CRCX response
+  * osmux: Handle Osmux MGCP extension in MDCX messages
+  * mgcp-cli: Allow submitting X-Osmux on MDCX request
+  * mgcp-cli: Parse X-Osmux on MDCX response
+  * osmux: Drop unneeded OSMUX_STATE_NEGOTIATING
+  * mgcp-cli: endpoint_fsm: Add API to retrieve Osmux CID from MGW
+  * osmux: Provide correct local port during mgcp resp
+  * osmux: Use remote port to send osmux frames
+  * osmux: Improve logging around osmux enabling events
+  * osmux: Delay osmux enable of conn until remote addr is configured by MDCX
+  * osmux: Redo read/write osmux glue code to have data routed correctly
+  * mgw, mgcp-li: Handle X-Osmux param name as case insensitive
+  * osmux: Use DUMMY ft msg as per Osmux spec
+  * osmux: Fix loopback for Osmux connections
+  * osmux: Fix CID release for non-enabled connections
+  * osmux: Fix hardcoded rtp payload_type 98 in osmux conn
+  * mgcp-cli: Validate osmux cid value during mgcp_msg_gen
+  * mgw: Support uppercase LCO options
+  * mgw: Support lowercase header parameters
+  * mgcp-cli: Support lowercase header parameters
+  * mgw: Support receiving uppercase connection mode
+  * mgw: Support receiving lowercase LCO codec
+  * mgw: Make check of duplicated LCO fields case insensitive
+  * mgw: Allow receiving lowercase MGCP header keyword
+  * mgw: Allow receiving lowercase X-Osmo-Ign Callid field
+  * mgw: Allow receiving uppercase noanswer keyword
+  * doc: X-Osmo-IGN: small formatting and typo fixes
+  * doc: Add Osmux documentation to OsmoMGW User Manual
+  * Catch unsigned integer MGCP parsing errors with strtoul
+  * Fix return variable of strtoul()
+  * Remove undefined param passed to {logging,osmo_stats}_vty_add_cmds
+  * configure.ac: Require libosmo-netif 0.6.0
+
+  [ Alexander Couzens ]
+  * mgcp_internal: LOGPENDP: ensure *endp is not NULL
+
+  [ Harald Welte ]
+  * handle NULL return of rate_ctr_group_alloc()
+  * update .gitignore
+  * mgcp_sdp: Don't check if an unsigned int is below 0
+
+  [ Vadim Yanitskiy ]
+  * configure.ac: drop useless check for -fvisibility=hidden
+
+  [ Daniel Willmann ]
+  * manuals: Add script to regenerate vty/counter documentation
+  * manuals: Update vty/counter documentation
+
+  [ Hoernchen ]
+  * turn -Werror=null-dereference into a warning
+
+ -- Pau Espin Pedrol <pespin@sysmocom.de>  Wed, 07 Aug 2019 16:52:58 +0200
+
 osmo-mgw (1.5.0) unstable; urgency=medium
 
   [ Pau Espin Pedrol ]

debian/compat

@@ -1 +1 @@
-9
+10

debian/control

@@ -1,16 +1,18 @@
 Source: osmo-mgw
 Section: net
 Priority: extra
-Maintainer: Alexander Couzens <lynxis@fe80.eu>
-Build-Depends: debhelper (>=9),
+Maintainer: Osmocom team <openbsc@lists.osmocom.org>
+Build-Depends: debhelper (>= 10),
                dh-autoreconf,
                pkg-config,
                autotools-dev,
-               libosmocore-dev,
-               libosmo-netif-dev
+               libosmocore-dev (>= 1.9.0),
+               libosmo-netif-dev (>= 1.4.0),
+               libosmo-abis-dev (>= 1.5.0),
+               osmo-gsm-manuals-dev (>= 1.5.0)
 Standards-Version: 3.9.8
-Vcs-Git: git://git.osmocom.org/osmo-mgw.git
-Vcs-Browser: https://git.osmocom.org/osmo-mgw/
+Vcs-Git: https://gitea.osmocom.org/cellular-infrastructure/osmo-mgw
+Vcs-Browser: https://gitea.osmocom.org/cellular-infrastructure/osmo-mgw
 Homepage: https://osmocom.org/projects/osmo-mgw
 
 Package: osmo-mgw
@@ -19,7 +21,7 @@ Multi-Arch: foreign
 Depends: ${misc:Depends}, ${shlibs:Depends}
 Description: OsmoMGW: Osmocom's Media Gateway for 2G and 3G circuit-switched mobile networks
 
-Package: libosmo-mgcp-client5
+Package: libosmo-mgcp-client12
 Section: libs
 Architecture: any
 Multi-Arch: same
@@ -31,5 +33,14 @@ Package: libosmo-mgcp-client-dev
 Section: libdevel
 Architecture: any
 Multi-Arch: same
-Depends: libosmo-mgcp-client5 (= ${binary:Version}), ${misc:Depends}
+Depends: libosmo-mgcp-client12 (= ${binary:Version}), ${misc:Depends}
 Description: libosmo-mgcp-client: Osmocom's Media Gateway Control Protocol client utilities
+
+Package: osmo-mgw-doc
+Architecture: all
+Section: doc
+Priority: optional
+Depends: ${misc:Depends}
+Description: ${misc:Package} PDF documentation
+ Various manuals: user manual, VTY reference manual and/or
+ protocol/interface manuals.

debian/copyright

@@ -1,12 +1,12 @@
 Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: osmo-mgw
-Source: git://git.osmocom.org/osmo-mgw
+Source: https://gitea.osmocom.org/cellular-infrastructure/osmo-mgw
 
 Files:     *
 Copyright: 2009-2014 On-Waves
            2009-2015 Holger Hans Peter Freyther <zecke@selfish.org>
            2013 Jacob Erlbeck <jerlbeck@sysmocom.de>
-           2016-2017 sysmocom s.m.f.c. GmbH <info@sysmocom.de>
+           2016-2017 sysmocom s.f.m.c. GmbH <info@sysmocom.de>
 License:   AGPL-3.0+
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as published by
@@ -22,7 +22,7 @@ License:   AGPL-3.0+
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 Files:     src/libosmo-mgcp-client/* include/osmocom/mgcp_client/*
-Copyright: 2016 by sysmocom s.m.f.c. GmbH <info@sysmocom.de>
+Copyright: 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
            Based on OpenBSC interface to quagga VTY (libmsc/vty_interface_layer3.c)
            2009 by Harald Welte <laforge@gnumonks.org>
            2009-2011 by Holger Hans Peter Freyther

debian/osmo-mgw-doc.install

@@ -0,0 +1 @@
+usr/share/doc/osmo-mgw-doc/*.pdf

debian/osmo-mgw.install

@@ -2,3 +2,4 @@ etc/osmocom/osmo-mgw.cfg
 lib/systemd/system/osmo-mgw.service
 usr/bin/osmo-mgw
 usr/share/doc/osmo-mgw/examples/osmo-mgw/osmo-mgw.cfg
+usr/share/doc/osmo-mgw/examples/osmo-mgw/osmo-mgw-abis_e1.cfg

debian/rules

@@ -30,6 +30,10 @@ override_dh_auto_test:
 	dh_auto_test || (find . -name testsuite.log -exec cat {} \; ; false)
 
 override_dh_auto_configure:
-	dh_auto_configure -- --with-systemdsystemunitdir=/lib/systemd/system
+	dh_auto_configure -- --with-systemdsystemunitdir=/lib/systemd/system --enable-manuals
+
+# Don't create .pdf.gz files (barely saves space and they can't be opened directly by most pdf readers)
+override_dh_compress:
+	dh_compress -X.pdf
 
 # See https://www.debian.org/doc/manuals/developers-reference/best-pkging-practices.html#bpp-dbg

doc/examples/osmo-mgw/osmo-mgw-abis_e1.cfg

@@ -0,0 +1,33 @@
+!
+! MGCP configuration example
+!
+log stderr
+ logging color 1
+ logging print category-hex 0
+ logging print category 1
+ logging timestamp 0
+ logging print file basename last
+ logging print level 1
+
+e1_input
+ e1_line 0 driver dahdi
+ e1_line 0 port 0
+mgcp
+  bind ip 127.0.0.1
+  rtp port-range 4002 16000
+  rtp bind-ip 127.0.0.1
+  rtp ip-probing
+  rtp ip-dscp 46
+  bind port 2427
+  sdp audio payload number 98
+  sdp audio payload name GSM
+  number endpoints 512
+  loop 0
+  force-realloc 1
+  rtcp-omit
+  rtp-patch ssrc
+  rtp-patch timestamp
+  trunk 1
+   rtp keep-alive once
+   no rtp keep-alive
+   line 0

doc/examples/osmo-mgw/osmo-mgw.cfg

@@ -1,16 +1,24 @@
 !
 ! MGCP configuration example
 !
+log stderr
+ logging color 1
+ logging print category-hex 0
+ logging print category 1
+ logging timestamp 0
+ logging print file basename last
+ logging print level 1
+
 mgcp
   bind ip 127.0.0.1
   rtp port-range 4002 16000
-  rtp bind-ip 10.9.1.122
+  rtp bind-ip 127.0.0.1
   rtp ip-probing
-  rtp ip-tos 184
+  rtp ip-dscp 46
   bind port 2427
   sdp audio payload number 98
   sdp audio payload name GSM
-  number endpoints 31
+  number endpoints 512
   loop 0
   force-realloc 1
   rtcp-omit

doc/manuals/Makefile.am

@@ -1,6 +1,7 @@
 EXTRA_DIST = osmomgw-usermanual.adoc \
     osmomgw-usermanual-docinfo.xml \
     osmomgw-vty-reference.xml \
+    regen_doc.sh \
     chapters \
     vty
 
@@ -12,5 +13,11 @@ if BUILD_MANUALS
   VTY_REFERENCE = osmomgw-vty-reference.xml
   include $(OSMO_GSM_MANUALS_DIR)/build/Makefile.vty-reference.inc
 
+  BUILT_REFERENCE_XML = $(builddir)/vty/mgw_vty_reference.xml
+  $(builddir)/vty/mgw_vty_reference.xml: $(top_builddir)/src/osmo-mgw/osmo-mgw
+	mkdir -p $(builddir)/vty
+	$(top_builddir)/src/osmo-mgw/osmo-mgw --vty-ref-xml > $@
+
+  OSMO_REPOSITORY = osmo-mgw
   include $(OSMO_GSM_MANUALS_DIR)/build/Makefile.common.inc
 endif

doc/manuals/chapters/configuration.adoc

@@ -23,14 +23,13 @@ OsmoMGW(config-mgcp)# local ip 127.0.0.1
 
 === Configuring the trunk
 
-The first trunk (trunk 0) is considered a virtual trunk in OsmoMGW. All
+The first trunk is considered a virtual trunk in OsmoMGW. All
 endpoints of type "rtpbridge" are routed here. The virtual trunk is configured
 in the config-mgcp context.
 
 All other trunks are configured in the config-mgcp-trunk context, but the
-commands used are identical. Right now trunks are considered only for ds/e1
-type endpoints which are not yet implemented. Don't use trunks other than the
-"virtual" trunk 0.
+commands used are identical. Right now trunks are considered only for "ds/e1"
+type endpoints.
 
 .Example: MGCP trunk configuration
 ----
@@ -54,4 +53,77 @@ OsmoMGW(config-mgcp)# rtp-patch timestamp <3>
 <2> Hide SSRC changes
 <3> Ensure RTP timestamp is aligned with frame duration
 
+NOTE: Changes to trunks that affect resource allocation, such as newly created
+trunks or a change of the number of available endpoints, require a full restart
+of osmo-mgw!
 
+=== E1 trunk considerations
+
+While the RTP bridge trunks are natively based on IP no special considerations
+are required during setup. E1 trunks are mapped on a physical E1 line, which has
+to be configured as shown below.
+
+.Example: E1 line setup
+----
+OsmoMGW(config-e1_input)# e1_line 0 driver dahdi <1>
+OsmoMGW(config-e1_input)# e1_line 0 port 2 <2>
+----
+<1> Name of the libosmo-abis driver implementation ("dahdi")
+<2> Port number of the physical E1 port to use (2)
+
+In osmo-mgw the e1_input node is used to configure the physical E1 line. The
+line number will be used internally to identify the configured E1 line. The
+port number is the physical E1 connector (sometimes called 'span') at the E1
+hardware. Per trunk an individual E1 line will be needed. Beware that the E1
+driver may also need configuration settings that are not discussed here.
+
+.Example: E1 trunk setup
+----
+OsmoMGW(config-mgcp)# trunk 0 <1>
+OsmoMGW(config-mgcp-trunk)# line 0 <2>
+----
+<1> Creation of a trunk (0)
+<2> Reference to the E1 line to use (0)
+
+The E1 trunk is created along with a number, typically starting at 0, but if
+required any number from 0-64 is allowed. The E1 trunk configuration concerning
+the IP related aspects is nearly identical to the configuration of the virtual
+trunk. However, it is important that the user assigns one of the E1 line numbers
+that were configured under the e1_input node.
+
+NOTE: The endpoint name that is used on MGCP level will include the trunk number,
+not the E1 line number. For simplicity (and compatibility with OsmoBSC) it is
+recommended to use equal numbers for trunk and E1 line. However, if required any
+E1 line can be mapped flexible on any trunk as long as the mapping is bijective.
+
+.Example: A typical configuration with one E1 trunk
+----
+e1_input
+ e1_line 0 driver dahdi
+ e1_line 0 port 2
+mgcp
+ bind ip 127.0.0.1
+ rtp net-range 6000 6011
+ rtp net-bind-ip 192.168.100.130
+ rtp ip-probing
+ rtp ip-dscp 46
+ no rtp keep-alive
+ bind port 2428
+ number endpoints 30
+ loop 0
+ force-realloc 1
+ osmux off
+ rtp-patch rfc5993hr
+ trunk 0
+  rtp keep-alive once
+  no rtp keep-alive
+  line 0
+----
+
+NOTE: One E1 trunk always covers a whole E1 line. All subslots (I.640) will be mapped
+to individual MGCP endpoints. As long as the endpoints remain unused the
+underlying E1 timeslot is not used.
+
+NOTE: The E1 trunk implementation also works with T1 lines, however since T1 has
+24 instead of 31 usable timeslots only the endpoints that fall into that 1-24 timeslot
+range will be useable.

doc/manuals/chapters/counters_generated.adoc

@@ -1,10 +1,79 @@
 
 // autogenerated by show asciidoc counters
-These counters and their description based on OsmoMGW 1.3.0.34-9cd52 (OsmoMGW).
+These counters and their description based on OsmoMGW 1.5.0.64-189f (OsmoMGW).
 
 === Rate Counters
 
 // generating tables for rate_ctr_group
+// rate_ctr_group table aggregated statistics for all rtp connections
+.all_rtp_conn - aggregated statistics for all rtp connections
+[options="header"]
+|===
+| Name | Reference | Description
+| all_rtp:err_tstmp_in | <<all_rtp_conn_all_rtp:err_tstmp_in>> | Total inbound rtp-stream timestamp errors.
+| all_rtp:err_tstmp_out | <<all_rtp_conn_all_rtp:err_tstmp_out>> | Total outbound rtp-stream timestamp errors.
+| all_rtp:packets_rx | <<all_rtp_conn_all_rtp:packets_rx>> | Total inbound rtp packets.
+| all_rtp:octets_rx | <<all_rtp_conn_all_rtp:octets_rx>> | Total inbound rtp octets.
+| all_rtp:packets_tx | <<all_rtp_conn_all_rtp:packets_tx>> | Total outbound rtp packets.
+| all_rtp:octets_tx | <<all_rtp_conn_all_rtp:octets_tx>> | Total outbound rtp octets.
+| all_rtp:dropped | <<all_rtp_conn_all_rtp:dropped>> | Total dropped rtp packets.
+| all_rtp:num_closed_conns | <<all_rtp_conn_all_rtp:num_closed_conns>> | Total number of rtp connections closed.
+|===
+// rate_ctr_group table dlcx statistics
+.dlcx - dlcx statistics
+[options="header"]
+|===
+| Name | Reference | Description
+| dlcx:success | <<dlcx_dlcx:success>> | DLCX command processed successfully.
+| dlcx:wildcard | <<dlcx_dlcx:wildcard>> | wildcard names in DLCX commands are unsupported.
+| dlcx:no_conn | <<dlcx_dlcx:no_conn>> | endpoint specified in DLCX command has no active connections.
+| dlcx:callid | <<dlcx_dlcx:callid>> | CallId specified in DLCX command mismatches endpoint's CallId .
+| dlcx:connid | <<dlcx_dlcx:connid>> | connection ID specified in DLCX command does not exist on endpoint.
+| dlcx:unhandled_param | <<dlcx_dlcx:unhandled_param>> | unhandled parameter in DLCX command.
+| dlcx:rejected | <<dlcx_dlcx:rejected>> | connection deletion rejected by policy.
+| dlcx:deferred | <<dlcx_dlcx:deferred>> | connection deletion deferred by policy.
+|===
+// rate_ctr_group table mdcx statistics
+.mdcx - mdcx statistics
+[options="header"]
+|===
+| Name | Reference | Description
+| mdcx:success | <<mdcx_mdcx:success>> | MDCX command processed successfully.
+| mdcx:wildcard | <<mdcx_mdcx:wildcard>> | wildcard endpoint names in MDCX commands are unsupported.
+| mdcx:no_conn | <<mdcx_mdcx:no_conn>> | endpoint specified in MDCX command has no active connections.
+| mdcx:callid | <<mdcx_mdcx:callid>> | invalid CallId specified in MDCX command.
+| mdcx:connid | <<mdcx_mdcx:connid>> | invalid connection ID specified in MDCX command.
+| crcx:unhandled_param | <<mdcx_crcx:unhandled_param>> | unhandled parameter in MDCX command.
+| mdcx:no_connid | <<mdcx_mdcx:no_connid>> | no connection ID specified in MDCX command.
+| mdcx:conn_not_found | <<mdcx_mdcx:conn_not_found>> | connection specified in MDCX command does not exist.
+| mdcx:invalid_mode | <<mdcx_mdcx:invalid_mode>> | invalid connection mode in MDCX command.
+| mdcx:conn_opt | <<mdcx_mdcx:conn_opt>> | connection options invalid.
+| mdcx:no_remote_conn_desc | <<mdcx_mdcx:no_remote_conn_desc>> | no opposite end specified for connection.
+| mdcx:start_rtp_failure | <<mdcx_mdcx:start_rtp_failure>> | failure to start RTP processing.
+| mdcx:conn_rejected | <<mdcx_mdcx:conn_rejected>> | connection rejected by policy.
+| mdcx:conn_deferred | <<mdcx_mdcx:conn_deferred>> | connection deferred by policy.
+|===
+// rate_ctr_group table crxc statistics
+.crcx - crxc statistics
+[options="header"]
+|===
+| Name | Reference | Description
+| crcx:success | <<crcx_crcx:success>> | CRCX command processed successfully.
+| crcx:bad_action | <<crcx_crcx:bad_action>> | bad action in CRCX command.
+| crcx:unhandled_param | <<crcx_crcx:unhandled_param>> | unhandled parameter in CRCX command.
+| crcx:missing_callid | <<crcx_crcx:missing_callid>> | missing CallId in CRCX command.
+| crcx:invalid_mode | <<crcx_crcx:invalid_mode>> | invalid connection mode in CRCX command.
+| crcx:limit_exceeded | <<crcx_crcx:limit_exceeded>> | limit of concurrent connections was reached.
+| crcx:unkown_callid | <<crcx_crcx:unkown_callid>> | unknown CallId in CRCX command.
+| crcx:alloc_conn_fail | <<crcx_crcx:alloc_conn_fail>> | connection allocation failure.
+| crcx:no_remote_conn_desc | <<crcx_crcx:no_remote_conn_desc>> | no opposite end specified for connection.
+| crcx:start_rtp_failure | <<crcx_crcx:start_rtp_failure>> | failure to start RTP processing.
+| crcx:conn_rejected | <<crcx_crcx:conn_rejected>> | connection rejected by policy.
+| crcx:no_osmux | <<crcx_crcx:no_osmux>> | no osmux offered by peer.
+| crcx:conn_opt | <<crcx_crcx:conn_opt>> | connection options invalid.
+| crcx:codec_nego | <<crcx_crcx:codec_nego>> | codec negotiation failure.
+| crcx:bind_port | <<crcx_crcx:bind_port>> | port bind failure.
+|===
 == Osmo Stat Items
 
 // generating tables for osmo_stat_items

doc/manuals/chapters/mgcp_endpoints.adoc

@@ -0,0 +1,100 @@
+== MGCP Endpoints
+
+MGCP organizes the switching resources in so called endpoints. Each endpoint is
+referenced by its unique identifier. While RFC 3435 specifies a naming scheme, the
+actual identifier naming is subject to the implementation and configuration.
+
+=== RTP proxy / RTP bridge endpoints
+
+OsmoMGW implements a freely configurable number of `rtpbridge` endpoints. Those
+endpoints are able to host two connections at a time to model the functionality
+of a tandem switch.
+
+RTP bridge endpoint identifiers are referenced by the string `rtpbridge/`, a
+hexadecimal number without leading zeros and a domain name (configurable).
+
+----
+rtpbridge/<number>@<domain>
+----
+
+.Example: List of virtual endpoints
+----
+rtpbridge/1@mgw
+rtpbridge/2@mgw
+rtpbridge/3@mgw
+rtpbridge/4@mgw
+rtpbridge/5@mgw
+rtpbridge/6@mgw
+rtpbridge/7@mgw
+rtpbridge/8@mgw
+rtpbridge/9@mgw
+rtpbridge/a@mgw
+rtpbridge/b@mgw
+rtpbridge/c@mgw
+rtpbridge/d@mgw
+rtpbridge/e@mgw
+rtpbridge/f@mgw
+rtpbridge/10@mgw
+----
+
+=== E1/T1 endpoints
+
+OsmoMGW supports E1 subslot multiplexing as specified by I.460. All possible
+subslot combinations are mapped on individual endpoints. The endpoint names
+are prefixed with `ds/e1-` followed by the trunk number and the E1 timeslot.
+The subslot is defined by a bit rate and a bit offset.
+
+----
+ds/e1-<trunk>/s-<timeslot>/su<bitrate>-<bitoffset>@<domain>
+----
+
+.Example: List of endpoints on E1 trunk 0 at E1 timeslot 2
+----
+ds/e1-0/s-2/su64-0@mgw
+ds/e1-0/s-2/su32-0@mgw
+ds/e1-0/s-2/su32-4@mgw
+ds/e1-0/s-2/su16-0@mgw
+ds/e1-0/s-2/su16-2@mgw
+ds/e1-0/s-2/su16-4@mgw
+ds/e1-0/s-2/su16-6@mgw
+ds/e1-0/s-2/su8-0@mgw
+ds/e1-0/s-2/su8-1@mgw
+ds/e1-0/s-2/su8-2@mgw
+ds/e1-0/s-2/su8-3@mgw
+ds/e1-0/s-2/su8-4@mgw
+ds/e1-0/s-2/su8-5@mgw
+ds/e1-0/s-2/su8-6@mgw
+ds/e1-0/s-2/su8-7@mgw
+----
+
+When creating connections on endpoints that reside in one E1 timeslot the call
+agent must make sure that no overlapping endpoints are used. It is for example
+not possible to use `ds/e1-0/s-2/su16-2@mgw` and `ds/e1-0/s-2/su8-3@mgw` at the
+same time because they overlap.
+
+.Subslot overlapping
+[options="header"]
+|===
+| Bit offset  4+| Subslots
+| 0 | 8k .2+| 16k .4+| 32k .8+| 64k
+| 1 | 8k
+| 2 | 8k .2+| 16k
+| 3 | 8k
+| 4 | 8k .2+| 16k .4+| 32k
+| 5 | 8k
+| 6 | 8k .2+| 16k
+| 7 | 8k
+|===
+
+NOTE: The current implementation (December 2020) only implements TRAU frame
+encoding/decoding for 16K and 8K subslots. Endpoints with other bitrates are
+not yet useable.
+
+NOTE: the VTY command "show mgcp" can be used to get a list of all available
+endpoints (including identifiers)
+
+=== The `null` endpoint
+
+OsmoMGW offers a special `null@<domain>` endpoint which can be audited at all times.
+This is useful for MGCP clients who wish to submit requests to OsmoMGW
+periodically to find out whether it is still reachable and in a working state.

doc/manuals/chapters/mgcp_extensions.adoc

@@ -11,7 +11,7 @@ indicate collisions or configuration errors.
 
 ==== `X-Osmo-IGN` Format
 
-The value part of X-Osmo-IGN must be one or more items separated by one or more
+The value part of `X-Osmo-IGN` must be one or more items separated by one or more
 spaces. Each item consists of one or more non-whitespace characters.
 
 .Example: `X-Osmo-IGN` format with three ficticious items "X", "abc" and "123".
@@ -19,7 +19,7 @@ spaces. Each item consists of one or more non-whitespace characters.
 X-Osmo-IGN: X abc 123
 ----
 
-`X-Osmo-IGN` must be issued in the MGCP section (typically as its last item),
+`X-Osmo-IGN` must be issued in the MGCP header section (typically as its last item),
 before the SDP section starts.
 
 ==== Supported `X-Osmo-IGN` Items
@@ -66,3 +66,7 @@ m=audio 5904 RTP/AVP 97
 a=rtpmap:97 GSM-EFR/8000
 a=ptime:40
 ----
+
+=== `X-Osmux`
+
+See <<mgcp-extension-osmux>>

doc/manuals/chapters/overview.adoc

@@ -21,10 +21,10 @@ Protocol.
 digraph G {
     rankdir = LR;
     OsmoBTS -> OsmoBSC [label="Abis/IP"];
-    OsmoBSC -> OsmoMSC [label="3GPP AoIP"];
+    OsmoBSC -> "core-network" [label="3GPP AoIP"];
     OsmoBSC -> OsmoMGW [label="MGCP"];
     OsmoBTS -> OsmoMGW [label="RTP",dir=both];
-    OsmoMGW -> OsmoMSC [label="RTP",dir=both];
+    OsmoMGW -> "core-network" [label="RTP",dir=both];
     {rank=same OsmoBSC OsmoMGW}
     OsmoMGW [color=red];
 }
@@ -36,10 +36,9 @@ digraph G {
 ----
 digraph G {
     rankdir = LR;
-    BTS -> BSC [label="Abis"];
-    BSC -> OsmoMSC [label="3GPP AoIP"];
+    "2G BSS" -> OsmoMSC [label="3GPP AoIP"];
     OsmoMSC -> OsmoMGW [label="MGCP"];
-    BSC -> OsmoMGW [label="RTP",dir=both];
+    "2G BSS" -> OsmoMGW [label="RTP",dir=both];
     OsmoMSC -> OsmoSIP [label="MNCC"];
     OsmoSIP -> PBX [label="SIP Trunk"];
     OsmoMGW -> PBX [label="RTP",dir=both];
@@ -53,6 +52,22 @@ digraph G {
 }
 ----
 
+[[fig-bsc-e1]]
+.Integration of legacy E1 BTS in AoIP network
+[graphviz]
+----
+digraph G {
+    rankdir = LR;
+    BTS -> OsmoBSC [label="Abis/E1"];
+    OsmoBSC -> "core-network" [label="3GPP AoIP"];
+    OsmoBSC -> OsmoMGW [label="MGCP"];
+    BTS -> OsmoMGW [label="TRAU/E1",dir=both];
+    OsmoMGW -> "core-network" [label="RTP",dir=both];
+    {rank=same OsmoBSC OsmoMGW}
+    OsmoMGW [color=red];
+}
+----
+
 === Software Components
 
 OsmoMGW contains a variety of different software components, which we’ll
@@ -77,14 +92,14 @@ Transcoding is currently not supported in OsmoMGW.
 
 === Limitations
 
-Osmux is not yet supported in OsmoMGW.
-
-At the moment (July 2018), OsmoMGW only implements RTP proxy / RTP bridge
-type endpoints, to each of which two RTP connections can be established.
-We are planning to add endpoint types for:
+At the moment (November 2020), OsmoMGW implements RTP proxy / RTP bridge
+type endpoints and E1/T1 16k/8k sub-slots with TRAU frames for classic BTS
+support. To the RTP proxy / RTP bridge endpoints two RTP connections can
+be established, which then work as a tandem. E1/T1 endpoints support one
+RTP connection at a time that is associated with a sub-slot on an E1 line.
+We are planning to add further endpoint types for:
 
 - classic E1/T1 timeslots (64kBps alaw/ulaw)
-- classic E1/T1 16k sub-slots with TRAU frames for classic BTS support
 - announcement/playout end-points
 - conference endpoints
 
@@ -92,8 +107,8 @@ We are planning to add endpoint types for:
 
 You can find the OsmoMGW issue tracker and wiki online at
 
-- https://osmocom.org/projects/osmomgw
-- https://osmocom.org/projects/osmomgw/wiki
+- https://osmocom.org/projects/osmo-mgw
+- https://osmocom.org/projects/osmo-mgw/wiki
 
 RFC 3435 for MGCP is located at
 

doc/manuals/chapters/qos-example.adoc

@@ -0,0 +1,42 @@
+==== Full example of QoS for osmo-mgw
+
+In the below example we will show the full set of configuration required
+for both DSCP and PCP differentiation of RTP traffic by osmo-mgw.
+
+What we want to achieve in this example is the following configuration:
+
+.DSCP and PCP assignments for osmo-mgw Abis downlink traffic in this example
+[options="header",width="30%",cols="2,1,1"]
+|===
+|Traffic      |DSCP|PCP
+|RTP    |  46|  6
+|===
+
+. configure the osmo-mgw program to set the DSCP value
+. configure an egrees QoS map to map from priority to PCP
+
+.Example Step 1: add related VTY configuration to `osmo-mgw.cfg`
+----
+...
+mgcp
+ rtp ip-dscp 46
+ rtp socket-priority 6
+...
+----
+
+.Example Step 2: egress QoS map to map from socket priority to PCP values
+----
+$ sudo ip link set dev eth0.9<1> type vlan egress-qos-map 0:0 5:5 6:6 7:7 <2>
+----
+<1> make sure to specify your specific VLAN interface name here instead of `eth0.9`.
+<2> create a egress QoS map that maps the priority value 1:1 to the PCP. We also include the
+    mapping 5:5 and 7:7 from the osmo-bsc example (see <<userman-osmobsc>>) here.
+
+NOTE:: The settings of the `ip` command are volatile and only active until
+the next reboot (or the network device or VLAN is removed).  Please refer to
+the documentation of your specific Linux distribution in order to find out how
+to make such settings persistent by means of an `ifup` hook whenever the interface
+comes up.  For CentOS/RHEL 8 this can e.g. be achieved by means of an `/sbin/ifup-local
+script` (when using `network-scripts` and not NetworkManager).  For Debian or Ubuntu,
+this typically involves adding `up` lines to `/etc/network/interfaces` or a `/etc/network/if-up.d`
+script.

doc/manuals/chapters/running.adoc

@@ -12,7 +12,7 @@ arguments:
 *-h, --help*::
 	Print a short help message about the supported options
 *-V, --version*::
-	Print the compile-time version number of the OsmoBTS program
+	Print the compile-time version number of the program
 *-D, --daemonize*::
 	Fork the process as a daemon into background.
 *-c, --config-file 'CONFIGFILE'*::
@@ -23,3 +23,20 @@ arguments:
 	Disable colors for logging to stderr. This has mostly been
 	deprecated by VTY based logging configuration, see <<logging>>
 	for more information.
+
+
+=== Configure limits
+
+When servicing hundreds of media endpoints, it may be necessary to adjust the
+operating system's limit on open file descriptors for the osmo-mgw process. A
+typical default limit imposed by operating systems is 1024; this would be
+exceeded by, for example, about 256 active voice calls with 4 RTP/RTPC ports
+each, sockets for other interfaces not considered yet.
+
+It should be ok to set an OS limit on open file descriptors as high as 65536
+for osmo-mgw, which practically rules out failure from running out of file
+descriptors anywhere (<16,000 active calls).
+
+When using systemd, the file descriptor limit may be adjusted in the service
+file by the `LimitNOFILE` setting ("Number of Open FILE descriptors"). OsmoMGW
+ships a systemd service file with a high LimitNOFILE setting.

doc/manuals/osmomgw-usermanual.adoc

@@ -18,10 +18,18 @@ include::./common/chapters/logging.adoc[]
 
 include::{srcdir}/chapters/configuration.adoc[]
 
+include::{srcdir}/chapters/mgcp_endpoints.adoc[]
+
 include::{srcdir}/chapters/mgcp_extensions.adoc[]
 
+include::./common/chapters/osmux/osmux.adoc[]
+
+include::./common/chapters/qos-dscp-pcp.adoc[]
+
 //include::{srcdir}/chapters/counters.adoc[]
 
+include::./common/chapters/vty_cpu_sched.adoc[]
+
 include::./common/chapters/port_numbers.adoc[]
 
 include::./common/chapters/bibliography.adoc[]
@@ -29,5 +37,3 @@ include::./common/chapters/bibliography.adoc[]
 include::./common/chapters/glossary.adoc[]
 
 include::./common/chapters/gfdl.adoc[]
-
-

doc/manuals/regen_doc.sh

@@ -0,0 +1,17 @@
+#!/bin/sh -x
+
+if [ -z "$DOCKER_PLAYGROUND" ]; then
+	echo "You need to set DOCKER_PLAYGROUND"
+	exit 1
+fi
+
+SCRIPT=$(realpath "$0")
+MANUAL_DIR=$(dirname "$SCRIPT")
+
+COMMIT=${COMMIT:-$(git log -1 --format=format:%H)}
+
+cd "$DOCKER_PLAYGROUND/scripts" || exit 1
+
+OSMO_MGW_BRANCH=$COMMIT ./regen_doc.sh osmo-mgw 4243 \
+	"$MANUAL_DIR/chapters/counters_generated.adoc" \
+	"$MANUAL_DIR/vty/mgw_vty_reference.xml"

include/Makefile.am

@@ -3,11 +3,23 @@ SUBDIRS = \
 	$(NULL)
 
 nobase_include_HEADERS = \
+	osmocom/mgcp_client/defs.h \
 	osmocom/mgcp_client/mgcp_client.h \
+	osmocom/mgcp_client/mgcp_client_endpoint_fsm.h \
 	osmocom/mgcp_client/mgcp_client_fsm.h \
-	osmocom/mgcp_client/mgcp_common.h \
+	osmocom/mgcp_client/mgcp_client_pool.h \
+	osmocom/sdp/fmtp.h \
+	osmocom/sdp/sdp_strings.h \
+	$(NULL)
+
+noinst_HEADERS = \
 	osmocom/mgcp/mgcp.h \
 	osmocom/mgcp/mgcp_common.h \
-	osmocom/mgcp/mgcp_internal.h \
 	osmocom/mgcp/osmux.h \
 	$(NULL)
+
+# This gets copied during make from osmocom/mgcp/mgcp_common.h. Therefore it is not included in the source tree and we
+# don't need to distribute it (OS#4084).
+nobase_nodist_include_HEADERS = \
+	osmocom/mgcp_client/mgcp_common.h \
+	$(NULL)

include/osmocom/Makefile.am

@@ -1,4 +1,5 @@
 SUBDIRS = \
+	sdp \
 	mgcp_client \
 	mgcp \
 	$(NULL)

include/osmocom/mgcp/Makefile.am

@@ -6,5 +6,11 @@ noinst_HEADERS = \
 	mgcp_endp.h \
 	mgcp_sdp.h \
 	mgcp_codec.h \
+	mgcp_trunk.h \
 	debug.h \
+	mgcp_ratectr.h \
+	mgcp_e1.h \
+	mgcp_network.h \
+	mgcp_protocol.h \
+	mgcp_iuup.h \
 	$(NULL)

include/osmocom/mgcp/debug.h

@@ -29,6 +29,8 @@
 /* Debug Areas of the code */
 enum {
 	DRTP,
+	DE1,
+	DOSMUX,
 	Debug_LastEntry,
 };
 

include/osmocom/mgcp/mgcp.h

@@ -23,16 +23,21 @@
 #pragma once
 
 #include <osmocom/core/msgb.h>
+#include <osmocom/core/socket.h>
 #include <osmocom/core/write_queue.h>
 #include <osmocom/core/timer.h>
 #include <osmocom/core/logging.h>
 
 #include <osmocom/mgcp/mgcp_common.h>
+#include <osmocom/mgcp/osmux.h>
 
 #include <arpa/inet.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
+#include <pthread.h>
+
+#include "mgcp_ratectr.h"
 
 #define RTP_PORT_DEFAULT_RANGE_START 16002
 #define RTP_PORT_DEFAULT_RANGE_END RTP_PORT_DEFAULT_RANGE_START + 64
@@ -42,7 +47,7 @@
  */
 struct mgcp_endpoint;
 struct mgcp_config;
-struct mgcp_trunk_config;
+struct mgcp_trunk;
 struct mgcp_rtp_end;
 
 #define MGCP_ENDP_CRCX 1
@@ -59,10 +64,7 @@ struct mgcp_rtp_end;
 #define MGCP_POLICY_REJECT	5
 #define MGCP_POLICY_DEFER	6
 
-typedef int (*mgcp_realloc)(struct mgcp_trunk_config *cfg, int endpoint);
-typedef int (*mgcp_change)(struct mgcp_trunk_config *cfg, int endpoint, int state);
-typedef int (*mgcp_policy)(struct mgcp_trunk_config *cfg, int endpoint, int state, const char *transactio_id);
-typedef int (*mgcp_reset)(struct mgcp_trunk_config *cfg);
+typedef int (*mgcp_reset)(struct mgcp_trunk *cfg);
 typedef int (*mgcp_rqnt)(struct mgcp_endpoint *endp, char tone);
 
 /**
@@ -81,18 +83,21 @@ typedef int (*mgcp_processing_setup)(struct mgcp_endpoint *endp,
 				     struct mgcp_conn_rtp *conn_dst,
 				     struct mgcp_conn_rtp *conn_src);
 
+struct mgcp_rtp_codec;
+
 typedef void (*mgcp_get_format)(struct mgcp_endpoint *endp,
-				int *payload_type,
-				const char**subtype_name,
-				const char**fmtp_extra,
+				const struct mgcp_rtp_codec **codec,
+				const char **fmtp_extra,
 				struct mgcp_conn_rtp *conn);
 
 /**
  * This holds information on how to allocate ports
  */
 struct mgcp_port_range {
+	pthread_mutex_t lock;
 	/* addr or NULL to fall-back to default */
-	char *bind_addr;
+	char bind_addr_v4[INET6_ADDRSTRLEN];
+	char bind_addr_v6[INET6_ADDRSTRLEN];
 
 	/* dynamically allocated */
 	int range_start;
@@ -118,103 +123,6 @@ struct mgcp_port_range {
 #define MGCP_KEEPALIVE_ONCE (-1)
 #define MGCP_KEEPALIVE_NEVER 0
 
-/* Global MCGP CRCX related rate counters */
-enum {
-	MGCP_CRCX_SUCCESS,
-	MGCP_CRCX_FAIL_BAD_ACTION,
-	MGCP_CRCX_FAIL_UNHANDLED_PARAM,
-	MGCP_CRCX_FAIL_MISSING_CALLID,
-	MGCP_CRCX_FAIL_INVALID_MODE,
-	MGCP_CRCX_FAIL_LIMIT_EXCEEDED,
-	MGCP_CRCX_FAIL_UNKNOWN_CALLID,
-	MGCP_CRCX_FAIL_ALLOC_CONN,
-	MGCP_CRCX_FAIL_NO_REMOTE_CONN_DESC,
-	MGCP_CRCX_FAIL_START_RTP,
-	MGCP_CRCX_FAIL_REJECTED_BY_POLICY,
-	MGCP_CRCX_FAIL_NO_OSMUX,
-	MGCP_CRCX_FAIL_INVALID_CONN_OPTIONS,
-	MGCP_CRCX_FAIL_CODEC_NEGOTIATION,
-	MGCP_CRCX_FAIL_BIND_PORT,
-};
-
-/* Global MCGP MDCX related rate counters */
-enum {
-	MGCP_MDCX_SUCCESS,
-	MGCP_MDCX_FAIL_WILDCARD,
-	MGCP_MDCX_FAIL_NO_CONN,
-	MGCP_MDCX_FAIL_INVALID_CALLID,
-	MGCP_MDCX_FAIL_INVALID_CONNID,
-	MGCP_MDCX_FAIL_UNHANDLED_PARAM,
-	MGCP_MDCX_FAIL_NO_CONNID,
-	MGCP_MDCX_FAIL_CONN_NOT_FOUND,
-	MGCP_MDCX_FAIL_INVALID_MODE,
-	MGCP_MDCX_FAIL_INVALID_CONN_OPTIONS,
-	MGCP_MDCX_FAIL_NO_REMOTE_CONN_DESC,
-	MGCP_MDCX_FAIL_START_RTP,
-	MGCP_MDCX_FAIL_REJECTED_BY_POLICY,
-	MGCP_MDCX_DEFERRED_BY_POLICY
-};
-
-/* Global MCGP DLCX related rate counters */
-enum {
-	MGCP_DLCX_SUCCESS,
-	MGCP_DLCX_FAIL_WILDCARD,
-	MGCP_DLCX_FAIL_NO_CONN,
-	MGCP_DLCX_FAIL_INVALID_CALLID,
-	MGCP_DLCX_FAIL_INVALID_CONNID,
-	MGCP_DLCX_FAIL_UNHANDLED_PARAM,
-	MGCP_DLCX_FAIL_REJECTED_BY_POLICY,
-	MGCP_DLCX_DEFERRED_BY_POLICY,
-};
-
-struct mgcp_trunk_config {
-	struct llist_head entry;
-
-	struct mgcp_config *cfg;
-
-	int trunk_nr;
-	int trunk_type;
-
-	char *audio_fmtp_extra;
-	char *audio_name;
-	int audio_payload;
-	int audio_send_ptime;
-	int audio_send_name;
-	int audio_loop;
-
-	int no_audio_transcoding;
-
-	int omit_rtcp;
-	int keepalive_interval;
-
-	/* RTP patching */
-	int force_constant_ssrc; /* 0: don't, 1: once */
-	int force_aligned_timing;
-
-	/* spec handling */
-	int force_realloc;
-
-	/* timer */
-	struct osmo_timer_list keepalive_timer;
-
-	/* When set, incoming RTP packets are not filtered
-	 * when ports and ip-address do not match (debug) */
-	int rtp_accept_all;
-
-	unsigned int number_endpoints;
-	int vty_number_endpoints;
-	struct mgcp_endpoint *endpoints;
-
-	/* Rate counter group which contains stats for processed CRCX commands. */
-	struct rate_ctr_group *mgcp_crcx_ctr_group;
-	/* Rate counter group which contains stats for processed MDCX commands. */
-	struct rate_ctr_group *mgcp_mdcx_ctr_group;
-	/* Rate counter group which contains stats for processed DLCX commands. */
-	struct rate_ctr_group *mgcp_dlcx_ctr_group;
-	/* Rate counter group which aggregates stats of individual RTP connections. */
-	struct rate_ctr_group *all_rtp_conn_stats;
-};
-
 enum mgcp_role {
 	MGCP_BSC = 0,
 	MGCP_BSC_NAT,
@@ -222,58 +130,63 @@ enum mgcp_role {
 
 struct mgcp_config {
 	int source_port;
-	char *local_ip;
-	char *source_addr;
-	char *call_agent_addr;
+	char local_ip[INET6_ADDRSTRLEN];
+	char source_addr[INET6_ADDRSTRLEN];
+	char call_agent_addr[INET6_ADDRSTRLEN];
 
 	/* RTP processing */
 	mgcp_processing rtp_processing_cb;
 	mgcp_processing_setup setup_rtp_processing_cb;
 
-	mgcp_get_format get_net_downlink_format_cb;
-
 	struct osmo_wqueue gw_fd;
 
 	struct mgcp_port_range net_ports;
 	int endp_dscp;
+	int endp_priority;
 
 	int force_ptime;
 
-	mgcp_change change_cb;
-	mgcp_policy policy_cb;
 	mgcp_reset reset_cb;
-	mgcp_realloc realloc_cb;
 	mgcp_rqnt rqnt_cb;
 	void *data;
 
-	uint32_t last_call_id;
-
-	/* trunk handling */
-	struct mgcp_trunk_config trunk;
+	/* list holding the trunks */
 	struct llist_head trunks;
 
 	enum mgcp_role role;
 
-	/* osmux translator: 0 means disabled, 1 means enabled */
-	int osmux;
-	/* addr to bind the server to */
-	char *osmux_addr;
-	/* The BSC-NAT may ask for enabling osmux on demand. This tells us if
-	 * the osmux socket is already initialized.
-	 */
-	int osmux_init;
-	/* osmux batch factor: from 1 to 4 maximum */
-	int osmux_batch;
-	/* osmux batch size (in bytes) */
-	int osmux_batch_size;
-	/* osmux port */
-	uint16_t osmux_port;
-	/* Pad circuit with dummy messages until we see the first voice
-	 * message.
-	 */
-	uint16_t osmux_dummy;
+	struct {
+		/* Osmux usage policy: */
+		enum osmux_usage usage;
+		/* addr to bind the server to */
+		char *local_addr_v4;
+		char *local_addr_v6;
+		/* osmux port */
+		uint16_t local_port;
+		/* The osmux socket is allocated on demand (1st time used).
+		* This tells us if the osmux socket is already initialized.  */
+		bool initialized;
+		/* osmux batch factor: from 1 to 4 maximum */
+		int batch_factor;
+		/* osmux batch size (in bytes) */
+		int batch_size;
+		/* Pad circuit with dummy AMR frames if no payload to transmit is available */
+		bool dummy_padding;
+		/* Whether peer is behind NAT (Retrieve remote addr from 1st received Osmux packet) */
+		bool peer_behind_nat;
+	} osmux;
 	/* domain name of the media gateway */
 	char domain[255+1];
+
+	/* time after which inactive connections (CIs) get closed */
+	int conn_timeout;
+
+	/* osmocom CTRL interface */
+	struct ctrl_handle *ctrl;
+
+	/* global rate counters to measure the MGWs overall performance and
+	 * health */
+	struct mgcp_ratectr_global ratectr;
 };
 
 /* config management */
@@ -281,8 +194,7 @@ struct mgcp_config *mgcp_config_alloc(void);
 int mgcp_parse_config(const char *config_file, struct mgcp_config *cfg,
 		      enum mgcp_role role);
 int mgcp_vty_init(void);
-int mgcp_endpoints_allocate(struct mgcp_trunk_config *cfg);
-void mgcp_trunk_set_keepalive(struct mgcp_trunk_config *tcfg, int interval);
+void mgcp_trunk_set_keepalive(struct mgcp_trunk *trunk, int interval);
 
 /*
  * format helper functions
@@ -290,9 +202,10 @@ void mgcp_trunk_set_keepalive(struct mgcp_trunk_config *tcfg, int interval);
 struct msgb *mgcp_handle_message(struct mgcp_config *cfg, struct msgb *msg);
 
 
-int mgcp_send_reset_ep(struct mgcp_endpoint *endp, int endpoint);
+int mgcp_send_reset_ep(struct mgcp_endpoint *endp);
 int mgcp_send_reset_all(struct mgcp_config *cfg);
 
 
-int mgcp_create_bind(const char *source_addr, struct osmo_fd *fd, int port);
-int mgcp_udp_send(int fd, struct in_addr *addr, int port, char *buf, int len);
+int mgcp_create_bind(const char *source_addr, struct osmo_fd *fd, int port, uint8_t dscp,
+		     uint8_t prio);
+int mgcp_udp_send(int fd, const struct osmo_sockaddr *addr, const char *buf, int len);

include/osmocom/mgcp/mgcp_codec.h

@@ -1,7 +1,22 @@
 #pragma once
 
+#define DEFAULT_RTP_AUDIO_FRAME_DUR_NUM 20
+#define DEFAULT_RTP_AUDIO_FRAME_DUR_DEN 1000
+#define DEFAULT_RTP_AUDIO_PACKET_DURATION_MS 20
+#define DEFAULT_RTP_AUDIO_DEFAULT_RATE  8000
+#define DEFAULT_RTP_AUDIO_DEFAULT_CHANNELS 1
+
+#define PTYPE_UNDEFINED (-1)
+
+struct mgcp_conn_rtp;
+
 void mgcp_codec_summary(struct mgcp_conn_rtp *conn);
 void mgcp_codec_reset_all(struct mgcp_conn_rtp *conn);
-int mgcp_codec_add(struct mgcp_conn_rtp *conn, int payload_type, const char *audio_name);
-int mgcp_codec_decide(struct mgcp_conn_rtp *conn);
-int mgcp_codec_pt_translate(struct mgcp_conn_rtp *conn_src, struct mgcp_conn_rtp *conn_dst, int payload_type);
+int mgcp_codec_add(struct mgcp_conn_rtp *conn, int payload_type, const char *audio_name, const struct mgcp_codec_param *param);
+int mgcp_codec_add2(struct mgcp_conn_rtp *conn, int payload_type, const char *audio_name, const char *fmtp);
+int mgcp_codec_decide(struct mgcp_conn_rtp *conn_src, struct mgcp_conn_rtp *conn_dst);
+const struct mgcp_rtp_codec *mgcp_codec_pt_find_by_subtype_name(struct mgcp_conn_rtp *conn,
+								const char *subtype_name, unsigned int match_nr);
+bool mgcp_codec_amr_align_mode_is_indicated(const struct mgcp_rtp_codec *codec);
+bool mgcp_codec_amr_is_octet_aligned(const struct mgcp_rtp_codec *codec);
+struct mgcp_rtp_codec *mgcp_codec_from_pt(struct mgcp_conn_rtp *conn, int payload_type);

include/osmocom/mgcp/mgcp_common.h

@@ -47,9 +47,11 @@ enum mgcp_connection_mode {
 	MGCP_CONN_SEND_ONLY = 2,
 	MGCP_CONN_RECV_SEND = MGCP_CONN_RECV_ONLY | MGCP_CONN_SEND_ONLY,
 	MGCP_CONN_LOOPBACK  = 4 | MGCP_CONN_RECV_SEND,
+	MGCP_CONN_CONFECHO  = 8 | MGCP_CONN_RECV_SEND,
 };
 
 #define MGCP_X_OSMO_IGN_HEADER "X-Osmo-IGN:"
+#define MGCP_X_OSMO_OSMUX_HEADER "X-Osmux:"
 
 /* Values should be bitwise-OR-able */
 enum mgcp_x_osmo_ign {
@@ -57,14 +59,20 @@ enum mgcp_x_osmo_ign {
 	MGCP_X_OSMO_IGN_CALLID = 1,
 };
 
+/* Deprecated. Use the new fmtp string instead. */
+struct mgcp_codec_param {
+	bool amr_octet_aligned_present;
+	bool amr_octet_aligned;
+};
+
 /* Ensure that the msg->l2h is NUL terminated. */
 static inline int mgcp_msg_terminate_nul(struct msgb *msg)
 {
-	unsigned char *tail = msg->l2h + msgb_l2len(msg); /* char after l2 data */
+	unsigned char *tail = msg->tail; /* char after l2 data */
 	if (tail[-1] == '\0')
 		/* nothing to do */;
 	else if (msgb_tailroom(msg) > 0)
-		tail[0] = '\0';
+		msgb_put_u8(msg, (uint8_t)'\0');
 	else if (tail[-1] == '\r' || tail[-1] == '\n')
 		tail[-1] = '\0';
 	else {
@@ -93,6 +101,10 @@ static inline int mgcp_msg_terminate_nul(struct msgb *msg)
 /* A prefix to denote the virtual trunk (RTP on both ends) */
 #define MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK "rtpbridge/"
 
+/* A prefix to denote the e1 trunk
+ * (see also RFC3435 section E.2) */
+#define MGCP_ENDPOINT_PREFIX_E1_TRUNK "ds/e1-"
+
 /* Maximal number of payload types / codecs that can be negotiated via SDP at
  * at once. */
 #define MGCP_MAX_CODECS 10

include/osmocom/mgcp/mgcp_conn.h

@@ -23,21 +23,139 @@
 
 #pragma once
 
-#include <osmocom/mgcp/mgcp_internal.h>
+#include <osmocom/mgcp/mgcp.h>
+#include <osmocom/mgcp/mgcp_network.h>
+#include <osmocom/mgcp/osmux.h>
 #include <osmocom/core/linuxlist.h>
 #include <osmocom/core/rate_ctr.h>
+#include <osmocom/gsm/iuup.h>
 #include <inttypes.h>
 
+#define LOGPCONN(conn, cat, level, fmt, args...) \
+LOGPENDP((conn)->endp, cat, level, "CI:%s " fmt, \
+         (conn)->id, \
+         ## args)
+
+#define LOG_CONN(conn, level, fmt, args...) \
+	LOGP(DRTP, level, "(%s I:%s) " fmt, \
+	     (conn)->endp ? (conn)->endp->name : "none", (conn)->id, ## args)
+
+#define LOG_CONN_RTP(conn_rtp, level, fmt, args...) \
+	LOG_CONN((conn_rtp)->conn, level, fmt, ## args)
+
+/* Specific rtp connection type (see struct mgcp_conn_rtp) */
+enum mgcp_conn_rtp_type {
+	MGCP_RTP_DEFAULT	= 0,
+	MGCP_RTP_OSMUX,
+	MGCP_RTP_IUUP,
+};
+extern const struct value_string mgcp_conn_rtp_type_names[];
+static inline const char *mgcp_conn_rtp_type_name(enum mgcp_conn_rtp_type val)
+{
+	return get_value_string(mgcp_conn_rtp_type_names, val);
+}
+
+/*! Connection type, specifies which member of the union "u" in mgcp_conn
+ *  contains a useful connection description (currently only RTP) */
+enum mgcp_conn_type {
+	MGCP_CONN_TYPE_RTP,
+};
+
+/* MGCP connection (RTP) */
+struct mgcp_conn_rtp {
+
+	/* Backpointer to conn struct */
+	struct mgcp_conn *conn;
+
+	/* Specific connection type */
+	enum mgcp_conn_rtp_type type;
+
+	/* Port status */
+	struct mgcp_rtp_end end;
+
+	/* Sequence bits */
+	struct mgcp_rtp_state state;
+
+	/* taps for the rtp connection; one per direction */
+	struct mgcp_rtp_tap tap_in;
+	struct mgcp_rtp_tap tap_out;
+
+	/* Osmux states (optional) */
+	struct {
+		/* Osmux state: disabled, activating, active */
+		enum osmux_state state;
+		/* Is local_cid holding valid data? is it allocated from pool? */
+		bool local_cid_allocated;
+		/* Allocated local Osmux circuit ID for this conn */
+		uint8_t local_cid;
+		/* Is remote_cid holding valid data? was it already received from client? */
+		bool remote_cid_present;
+		/* Received remote Osmux circuit ID for this conn */
+		uint8_t remote_cid;
+		/* handle to batch messages, shared (refcounted) among several conns */
+		struct osmux_in_handle *in;
+		/* handle to unbatch messages, one allocated and owned per conn */
+		struct osmux_out_handle *out;
+		/* statistics: */
+		struct rate_ctr_group *ctrg;
+	} osmux;
+
+	struct {
+		struct osmo_iuup_instance *iui;
+		bool active_init; /* true: Send IuUP Init */
+		int rfci_id_no_data; /* RFCI Id for RFCI NO_DATA (-1 if not available) */
+		bool configured;
+		struct osmo_iuup_rnl_prim *init_ind;
+	} iuup;
+
+	struct rate_ctr_group *ctrg;
+};
+
+/*! MGCP connection (untyped) */
+struct mgcp_conn {
+	/*! list head */
+	struct llist_head entry;
+
+	/*! Backpointer to the endpoint where the conn belongs to */
+	struct mgcp_endpoint *endp;
+
+	/*! type of the connection (union) */
+	enum mgcp_conn_type type;
+
+	/*! mode of the connection */
+	enum mgcp_connection_mode mode;
+
+	/*! copy of the mode to restore the original setting (VTY) */
+	enum mgcp_connection_mode mode_orig;
+
+	/*! connection id to identify the connection */
+	char id[MGCP_CONN_ID_MAXLEN];
+
+	/*! human readable name (vty, logging) */
+	char name[256];
+
+	/*! activity tracker (for cleaning up inactive connections) */
+	struct osmo_timer_list watchdog;
+
+	/*! union with connection description */
+	union {
+		struct mgcp_conn_rtp rtp;
+	} u;
+
+	/*! pointer to optional private data */
+	void *priv;
+};
+
 /* RTP connection related counters */
 enum {
 	IN_STREAM_ERR_TSTMP_CTR,
 	OUT_STREAM_ERR_TSTMP_CTR,
-        RTP_PACKETS_RX_CTR,
-        RTP_OCTETS_RX_CTR,
-        RTP_PACKETS_TX_CTR,
-        RTP_OCTETS_TX_CTR,
-        RTP_DROPPED_PACKETS_CTR,
-        RTP_NUM_CONNECTIONS,
+	RTP_PACKETS_RX_CTR,
+	RTP_OCTETS_RX_CTR,
+	RTP_PACKETS_TX_CTR,
+	RTP_OCTETS_TX_CTR,
+	RTP_DROPPED_PACKETS_CTR,
+	RTP_NUM_CONNECTIONS,
 };
 
 /* RTP per-connection statistics. Instances of the corresponding rate counter group
@@ -50,7 +168,7 @@ static const struct rate_ctr_desc mgcp_conn_rate_ctr_desc[] = {
 	[RTP_OCTETS_RX_CTR] = {"rtp:octets_rx", "Inbound rtp octets."},
 	[RTP_PACKETS_TX_CTR] = {"rtp:packets_tx", "Outbound rtp packets."},
 	[RTP_OCTETS_TX_CTR] = {"rtp:octets_tx", "Outbound rtp octets."},
-	[RTP_DROPPED_PACKETS_CTR] = {"rtp:dropped", "dropped rtp packets."}
+	[RTP_DROPPED_PACKETS_CTR] = {"rtp:dropped", "Dropped rtp packets."}
 };
 
 /* Aggregated RTP connection stats. These are updated when an RTP connection is freed.
@@ -68,6 +186,57 @@ static const struct rate_ctr_desc all_rtp_conn_rate_ctr_desc[] = {
 	[RTP_NUM_CONNECTIONS] = {"all_rtp:num_closed_conns", "Total number of rtp connections closed."}
 };
 
+/* Osmux connection related counters */
+enum {
+	OSMUX_CHUNKS_RX_CTR,
+	OSMUX_OCTETS_RX_CTR,
+	OSMUX_RTP_PACKETS_TX_CTR,
+	OSMUX_RTP_PACKETS_TX_DROPPED_CTR,
+	OSMUX_AMR_OCTETS_TX_CTR,
+	/* Only available in global stats: */
+	OSMUX_NUM_CONNECTIONS,
+	OSMUX_PACKETS_RX_CTR,
+	OSMUX_PACKETS_TX_CTR,
+	OSMUX_DROPPED_PACKETS_CTR,
+};
+
+/* RTP per-connection statistics. Instances of the corresponding rate counter group
+ * exist for the lifetime of an RTP connection.
+ * Must be kept in sync with all_rtp_conn_rate_ctr_desc below */
+static const struct rate_ctr_desc mgcp_conn_osmux_rate_ctr_desc[] = {
+	[OSMUX_CHUNKS_RX_CTR] = {"osmux:chunks_rx", "Inbound Osmux chunks."},
+	[OSMUX_OCTETS_RX_CTR] = {"osmux:octets_rx", "Inbound Osmux octets."},
+	[OSMUX_RTP_PACKETS_TX_CTR] = {"osmux:rtp_packets_tx", "Tx outbound RTP packets to encode as Osmux."},
+	[OSMUX_RTP_PACKETS_TX_DROPPED_CTR] = {"osmux:rtp_packets_tx_dropped", "Dropped Tx outbound RTP packets to encode as Osmux."},
+	[OSMUX_AMR_OCTETS_TX_CTR] = {"osmux:amr_octets_tx", "Tx outbound AMD payload octets."},
+};
+
+/* Aggregated Osmux connection stats. These are updated when an Osmux connection is freed.
+ * Must be kept in sync with mgcp_conn_osmux_rate_ctr_desc above */
+static const struct rate_ctr_desc all_osmux_conn_rate_ctr_desc[] = {
+	[OSMUX_CHUNKS_RX_CTR] = {"all_osmux:chunks_rx", "Inbound Osmux chunks."},
+	[OSMUX_OCTETS_RX_CTR] = {"all_osmux:octets_rx", "Inbound Osmux octets."},
+	[OSMUX_RTP_PACKETS_TX_CTR] = {"all_osmux:rtp_packets_tx", "Tx outbound RTP packets to encode as Osmux."},
+	[OSMUX_RTP_PACKETS_TX_DROPPED_CTR] = {"all_osmux:rtp_packets_tx_dropped", "Dropped Tx outbound RTP packets to encode as Osmux."},
+	[OSMUX_AMR_OCTETS_TX_CTR] = {"all_osmux:amr_octets_tx", "Tx outbound AMD payload octets."},
+	/* These last counters below do not exist in per-connection stats, only here: */
+	[OSMUX_NUM_CONNECTIONS] = {"all_osmux:num_closed_conns", "Total number of osmux connections closed."},
+	[OSMUX_PACKETS_RX_CTR] = {"all_osmux:packets_rx", "Total inbound UDP/Osmux packets."},
+	[OSMUX_PACKETS_TX_CTR] = {"all_osmux:packets_tx", "Total outbound UDP/Osmux packets."},
+	[OSMUX_DROPPED_PACKETS_CTR] = {"all_osmux:dropped_packets", "Dropped outbound UDP/Osmux packets."}
+};
+
+/* Was conn configured to handle Osmux? */
+static inline bool mgcp_conn_rtp_is_osmux(const struct mgcp_conn_rtp *conn) {
+	return conn->type == MGCP_RTP_OSMUX;
+}
+
+/* Was conn configured to handle Osmux? */
+static inline bool mgcp_conn_rtp_is_iuup(const struct mgcp_conn_rtp *conn)
+{
+	return conn->type == MGCP_RTP_IUUP;
+}
+
 struct mgcp_conn *mgcp_conn_alloc(void *ctx, struct mgcp_endpoint *endp,
 				  enum mgcp_conn_type type, char *name);
 struct mgcp_conn *mgcp_conn_get(struct mgcp_endpoint *endp, const char *id);
@@ -78,3 +247,5 @@ void mgcp_conn_free_oldest(struct mgcp_endpoint *endp);
 void mgcp_conn_free_all(struct mgcp_endpoint *endp);
 char *mgcp_conn_dump(struct mgcp_conn *conn);
 struct mgcp_conn *mgcp_find_dst_conn(struct mgcp_conn *conn);
+struct mgcp_conn *mgcp_conn_get_oldest(struct mgcp_endpoint *endp);
+void mgcp_conn_watchdog_kick(struct mgcp_conn *conn);

include/osmocom/mgcp/mgcp_e1.h

@@ -0,0 +1,27 @@
+#pragma once
+
+/* A 64k timeslot on an E1 line can be subdevied into the following
+ * subslot combinations:
+ *
+ * subslot:                                          offset:
+ * [          ][          ][   16k    ][8k_subslot]  0
+ * [          ][   32k    ][_subslot__][8k_subslot]  1
+ * [          ][ subslot  ][   16k    ][8k_subslot]  2
+ * [   64k    ][__________][_subslot__][8k_subslot]  3
+ * [ timeslot ][          ][   16k    ][8k_subslot]  4
+ * [          ][   32K    ][_subslot__][8k_subslot]  5
+ * [          ][ subslot  ][   16k    ][8k_subslot]  6
+ * [          ][          ][ subslot  ][8k_subslot]  7
+ *
+ * Since overlapping assignment of subslots is not possible there is a limited
+ * set of subslot assignments possible. The e1_rates array lists the possible
+ * assignments as depicted above. Also each subslot assignment comes along with
+ * a bit offset in the E1 bitstream. The e1_offsets arrays lists the bit
+ * offsets. */
+static const uint8_t e1_rates[] = { 64, 32, 32, 16, 16, 16, 16, 8, 8, 8, 8, 8, 8, 8, 8 };
+static const uint8_t e1_offsets[] = { 0, 0, 4, 0, 2, 4, 6, 0, 1, 2, 3, 4, 5, 6, 7 };
+
+int mgcp_e1_endp_equip(struct mgcp_endpoint *endp, uint8_t ts, uint8_t ss, uint8_t offs);
+void mgcp_e1_endp_update(struct mgcp_endpoint *endp);
+void mgcp_e1_endp_release(struct mgcp_endpoint *endp, uint8_t ts);
+int mgcp_e1_send_rtp(struct mgcp_endpoint *endp, struct mgcp_rtp_codec *codec, struct msgb *msg);

include/osmocom/mgcp/mgcp_endp.h

@@ -23,15 +23,41 @@
 
 #pragma once
 
-struct sockaddr_in;
+#include <osmocom/core/msgb.h>
+#include <osmocom/gsm/i460_mux.h>
+#include <osmocom/mgcp/mgcp_protocol.h>
+
+struct sockaddr;
 struct mgcp_conn;
+struct mgcp_conn_rtp;
 struct mgcp_endpoint;
 
-/* Callback type for RTP dispatcher functions
-   (e.g mgcp_dispatch_rtp_bridge_cb, see below) */
-typedef int (*mgcp_dispatch_rtp_cb) (int proto, struct sockaddr_in *addr,
-				     char *buf, unsigned int buf_size,
-				     struct mgcp_conn *conn);
+/* Number of E1 subslots (different variants, not all useable at the same time) */
+#define MGCP_ENDP_E1_SUBSLOTS 15
+
+#define LOGPENDP(endp, cat, level, fmt, args...) \
+LOGP(cat, level, "endpoint:%s " fmt, \
+     endp ? endp->name : "none", \
+     ## args)
+
+enum rtp_proto {
+	MGCP_PROTO_RTP,
+	MGCP_PROTO_RTCP,
+};
+
+struct osmo_rtp_msg_ctx {
+	enum rtp_proto proto;
+	struct mgcp_conn_rtp *conn_src;
+	struct osmo_sockaddr *from_addr;
+};
+
+#define OSMO_RTP_MSG_CTX(MSGB) ((struct osmo_rtp_msg_ctx*)(MSGB)->cb)
+
+osmo_static_assert(sizeof(((struct msgb*)0)->cb) >= sizeof(struct osmo_rtp_msg_ctx), osmo_rtp_msg_ctx_fits_in_msgb_cb);
+
+/* Callback type for RTP dispatcher functions (e.g mgcp_dispatch_rtp_bridge_cb, see below).
+ * The OSMO_RTP_MSG_CTX() should be set appropriately on the msg. */
+typedef int (*mgcp_dispatch_rtp_cb) (struct msgb *msg);
 
 /* Callback type for endpoint specific cleanup actions. This function
  * is automatically executed when a connection is freed (see mgcp_conn_free()
@@ -55,6 +81,7 @@ struct mgcp_endpoint_type {
 /*! MGCP endpoint typeset */
 struct mgcp_endpoint_typeset {
 	struct mgcp_endpoint_type rtp;
+	struct mgcp_endpoint_type e1;
 };
 
 /*! static MGCP endpoint typeset (pre-initalized, read-only) */
@@ -63,6 +90,9 @@ extern const struct mgcp_endpoint_typeset ep_typeset;
 /*! MGCP endpoint model */
 struct mgcp_endpoint {
 
+	/*! Unique endpoint name, used for addressing via MGCP */
+	char *name;
+
 	/*! Call identifier string (as supplied by the call agant) */
 	char *callid;
 
@@ -72,11 +102,8 @@ struct mgcp_endpoint {
 	/*! List of struct mgcp_conn, of the connections active on this endpoint */
 	struct llist_head conns;
 
-	/*! Backpointer to the MGW configuration */
-	struct mgcp_config *cfg;
-
-	/*! Backpointer to the Trunk specific configuration */
-	struct mgcp_trunk_config *tcfg;
+	/*! Backpointer to the trunk this endpoint belongs to */
+	struct mgcp_trunk *trunk;
 
 	/*! Endpoint properties (see above) */
 	const struct mgcp_endpoint_type *type;
@@ -87,16 +114,35 @@ struct mgcp_endpoint {
 	/*! Last MGCP response (in case re-transmission is required) */
 	char *last_response;
 
-	/*! Memorize if this endpoint was choosen by the MGW (wildcarded, true)
-	 *   or if the user has choosen the particular endpoint explicitly. */
-	bool wildcarded_req;
-
 	/*! MGCP_X_OSMO_IGN_* flags from 'X-Osmo-IGN:' header */
 	uint32_t x_osmo_ign;
+
+	/* E1 specific */
+	struct {
+		struct osmo_i460_schan_desc scd;
+		struct osmo_i460_subchan *schan;
+		struct osmo_fsm_inst *trau_sync_fi;
+		struct osmo_trau2rtp_state *trau_rtp_st;
+		uint8_t last_amr_ft;
+		struct mgcp_rtp_codec *last_codec;
+	} e1;
+
 };
 
-/*! Extract endpoint number for a given endpoint */
-#define ENDPOINT_NUMBER(endp) abs((int)(endp - endp->tcfg->endpoints))
-
+struct mgcp_endpoint *mgcp_endp_alloc(struct mgcp_trunk *trunk, unsigned int index);
+int mgcp_endp_claim(struct mgcp_endpoint *endp, const char *callid);
+void mgcp_endp_update(struct mgcp_endpoint *endp);
+bool mgcp_endp_is_wildcarded(const char *epname);
+bool mgcp_endp_is_null(const char *epname);
+struct mgcp_endpoint *mgcp_endp_by_name_trunk(int *cause, const char *epname,
+					      const struct mgcp_trunk *trunk);
+struct mgcp_endpoint *mgcp_endp_by_name(int *cause, const char *epname,
+					struct mgcp_config *cfg);
+bool mgcp_endp_avail(struct mgcp_endpoint *endp);
+void mgcp_endp_add_conn(struct mgcp_endpoint *endp, struct mgcp_conn *conn);
+void mgcp_endp_remove_conn(struct mgcp_endpoint *endp, struct mgcp_conn *conn);
+void mgcp_endp_strip_name(char *epname_stripped, const char *epname,
+			 const struct mgcp_trunk *trunk);
+struct mgcp_endpoint *mgcp_endp_find_specific(const char *epname,
+			const struct mgcp_trunk *trunk);
 void mgcp_endp_release(struct mgcp_endpoint *endp);
-

include/osmocom/mgcp/mgcp_internal.h

@@ -1,330 +0,0 @@
-/* MGCP Private Data */
-
-/*
- * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
- * (C) 2009-2012 by On-Waves
- * All Rights Reserved
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
- * the Free Software Foundation; either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#pragma once
-
-#include <string.h>
-#include <inttypes.h>
-#include <osmocom/core/select.h>
-#include <osmocom/mgcp/mgcp.h>
-#include <osmocom/core/linuxlist.h>
-#include <osmocom/core/counter.h>
-#include <osmocom/core/rate_ctr.h>
-
-#define CI_UNUSED 0
-
-/* FIXME: This this is only needed to compile the currently
- * broken OSMUX support. Remove when fixed */
-#define CONN_ID_BTS "0"
-#define CONN_ID_NET "1"
-
-enum mgcp_trunk_type {
-	MGCP_TRUNK_VIRTUAL,
-	MGCP_TRUNK_E1,
-};
-
-struct mgcp_rtp_stream_state {
-	uint32_t ssrc;
-	uint16_t last_seq;
-	uint32_t last_timestamp;
-	struct rate_ctr *err_ts_ctr;
-	int32_t last_tsdelta;
-	uint32_t last_arrival_time;
-};
-
-struct mgcp_rtp_state {
-	/* has this state structure been initialized? */
-	int initialized;
-
-	struct {
-		/* are we patching the SSRC value? */
-		int patch_ssrc;
-		/* original SSRC (to which we shall patch any different SSRC) */
-		uint32_t orig_ssrc;
-		/* offset to apply on the sequence number */
-		int seq_offset;
-		/* offset to apply on the timestamp number */
-		int32_t timestamp_offset;
-	} patch;
-
-	/* duration of a packet (FIXME: in which unit?) */
-	uint32_t packet_duration;
-
-	struct mgcp_rtp_stream_state in_stream;
-	struct mgcp_rtp_stream_state out_stream;
-
-	/* jitter and packet loss calculation */
-	struct {
-		int initialized;
-		uint16_t base_seq;
-		uint16_t max_seq;
-		uint32_t ssrc;
-		uint32_t jitter;
-		int32_t transit;
-		int cycles;
-	} stats;
-
-	bool patched_first_rtp_payload; /* FIXME: drop this, see OS#2459 */
-};
-
-struct mgcp_rtp_codec {
-	uint32_t rate;
-	int channels;
-	uint32_t frame_duration_num;
-	uint32_t frame_duration_den;
-
-	int payload_type;
-	char *audio_name;
-	char *subtype_name;
-};
-
-/* 'mgcp_rtp_end': basically a wrapper around the RTP+RTCP ports */
-struct mgcp_rtp_end {
-	/* local IP address of the RTP socket */
-	struct in_addr addr;
-
-	/* in network byte order */
-	int rtp_port, rtcp_port;
-
-	/* currently selected audio codec */
-	struct mgcp_rtp_codec *codec;
-
-	/* array with assigned audio codecs to choose from (SDP) */
-	struct mgcp_rtp_codec codecs[MGCP_MAX_CODECS];
-
-	/* number of assigned audio codecs (SDP) */
-	unsigned int codecs_assigned;
-
-	/* per endpoint data */
-	int  frames_per_packet;
-	uint32_t packet_duration_ms;
-	int maximum_packet_time; /* -1: not set */
-	char *fmtp_extra;
-	/* are we transmitting packets (1) or dropping (0) outbound packets */
-	int output_enabled;
-	/* FIXME: This parameter can be set + printed, but is nowhere used! */
-	int force_output_ptime;
-
-	/* RTP patching */
-	int force_constant_ssrc; /* -1: always, 0: don't, 1: once */
-	/* should we perform align_rtp_timestamp_offset() (1) or not (0) */
-	int force_aligned_timing;
-
-	/* Each end has a separate socket for RTP and RTCP */
-	struct osmo_fd rtp;
-	struct osmo_fd rtcp;
-
-	/* local UDP port number of the RTP socket; RTCP is +1 */
-	int local_port;
-};
-
-struct mgcp_rtp_tap {
-	/* is this tap active (1) or not (0) */
-	int enabled;
-	/* IP/port to which we're forwarding the tapped data */
-	struct sockaddr_in forward;
-};
-
-struct mgcp_lco {
-	char *string;
-	char *codec;
-	int pkt_period_min; /* time in ms */
-	int pkt_period_max; /* time in ms */
-};
-
-/* Specific rtp connection type (see struct mgcp_conn_rtp) */
-enum mgcp_conn_rtp_type {
-	MGCP_RTP_DEFAULT	= 0,
-	MGCP_OSMUX_BSC,
-	MGCP_OSMUX_BSC_NAT,
-};
-
-#include <osmocom/mgcp/osmux.h>
-struct mgcp_conn;
-
-/* MGCP connection (RTP) */
-struct mgcp_conn_rtp {
-
-	/* Backpointer to conn struct */
-	struct mgcp_conn *conn;
-
-	/* Specific connection type */
-	enum mgcp_conn_rtp_type type;
-
-	/* Port status */
-	struct mgcp_rtp_end end;
-
-	/* Sequence bits */
-	struct mgcp_rtp_state state;
-
-	/* taps for the rtp connection; one per direction */
-	struct mgcp_rtp_tap tap_in;
-	struct mgcp_rtp_tap tap_out;
-
-	/* Osmux states (optional) */
-	struct {
-		/* Osmux state: disabled, activating, active */
-		enum osmux_state state;
-		/* Allocated Osmux circuit ID for this endpoint */
-		int allocated_cid;
-		/* Used Osmux circuit ID for this endpoint */
-		uint8_t cid;
-		/* handle to batch messages */
-		struct osmux_in_handle *in;
-		/* handle to unbatch messages */
-		struct osmux_out_handle out;
-		/* statistics */
-		struct {
-			uint32_t chunks;
-			uint32_t octets;
-		} stats;
-	} osmux;
-
-	struct rate_ctr_group *rate_ctr_group;
-};
-
-/*! Connection type, specifies which member of the union "u" in mgcp_conn
- *  contains a useful connection description (currently only RTP) */
-enum mgcp_conn_type {
-	MGCP_CONN_TYPE_RTP,
-};
-
-/*! MGCP connection (untyped) */
-struct mgcp_conn {
-	/*! list head */
-	struct llist_head entry;
-
-	/*! Backpointer to the endpoint where the conn belongs to */
-	struct mgcp_endpoint *endp;
-
-	/*! type of the connection (union) */
-	enum mgcp_conn_type type;
-
-	/*! mode of the connection */
-	enum mgcp_connection_mode mode;
-
-	/*! copy of the mode to restore the original setting (VTY) */
-	enum mgcp_connection_mode mode_orig;
-
-	/*! connection id to identify the connection */
-	char id[MGCP_CONN_ID_MAXLEN];
-
-	/*! human readable name (vty, logging) */
-	char name[256];
-
-	/*! union with connection description */
-	union {
-		struct mgcp_conn_rtp rtp;
-	} u;
-
-	/*! pointer to optional private data */
-	void *priv;
-};
-
-#include <osmocom/mgcp/mgcp_conn.h>
-
-struct mgcp_endpoint_type;
-
-
-
-
-
-/**
- * Internal structure while parsing a request
- */
-struct mgcp_parse_data {
-	struct mgcp_config *cfg;
-	struct mgcp_endpoint *endp;
-	char *trans;
-	char *save;
-};
-
-int mgcp_send(struct mgcp_endpoint *endp, int is_rtp, struct sockaddr_in *addr,
-	      char *buf, int rc, struct mgcp_conn_rtp *conn_src,
-	      struct mgcp_conn_rtp *conn_dst);
-int mgcp_send_dummy(struct mgcp_endpoint *endp, struct mgcp_conn_rtp *conn);
-int mgcp_dispatch_rtp_bridge_cb(int proto, struct sockaddr_in *addr, char *buf,
-				unsigned int buf_size, struct mgcp_conn *conn);
-void mgcp_cleanup_rtp_bridge_cb(struct mgcp_endpoint *endp, struct mgcp_conn *conn);
-int mgcp_bind_net_rtp_port(struct mgcp_endpoint *endp, int rtp_port,
-			   struct mgcp_conn_rtp *conn);
-void mgcp_free_rtp_port(struct mgcp_rtp_end *end);
-
-/* For transcoding we need to manage an in and an output that are connected */
-static inline int endp_back_channel(int endpoint)
-{
-	return endpoint + 60;
-}
-
-struct mgcp_trunk_config *mgcp_trunk_alloc(struct mgcp_config *cfg, int index);
-struct mgcp_trunk_config *mgcp_trunk_num(struct mgcp_config *cfg, int index);
-
-char *get_lco_identifier(const char *options);
-int check_local_cx_options(void *ctx, const char *options);
-void mgcp_rtp_end_config(struct mgcp_endpoint *endp, int expect_ssrc_change,
-			 struct mgcp_rtp_end *rtp);
-uint32_t mgcp_rtp_packet_duration(struct mgcp_endpoint *endp,
-				  struct mgcp_rtp_end *rtp);
-
-/* payload processing default functions */
-int mgcp_rtp_processing_default(struct mgcp_endpoint *endp, struct mgcp_rtp_end *dst_end,
-				char *data, int *len, int buf_size);
-
-int mgcp_setup_rtp_processing_default(struct mgcp_endpoint *endp,
-				      struct mgcp_conn_rtp *conn_dst,
-				      struct mgcp_conn_rtp *conn_src);
-
-void mgcp_get_net_downlink_format_default(struct mgcp_endpoint *endp,
-					  int *payload_type,
-					  const char**audio_name,
-					  const char**fmtp_extra,
-					  struct mgcp_conn_rtp *conn);
-
-/* internal RTP Annex A counting */
-void mgcp_rtp_annex_count(struct mgcp_endpoint *endp, struct mgcp_rtp_state *state,
-			const uint16_t seq, const int32_t transit,
-			const uint32_t ssrc);
-
-int mgcp_set_ip_tos(int fd, int tos);
-
-enum {
-	MGCP_DEST_NET = 0,
-	MGCP_DEST_BTS,
-};
-
-
-#define MGCP_DUMMY_LOAD 0x23
-
-
-/**
- * SDP related information
- */
-/* Assume audio frame length of 20ms */
-#define DEFAULT_RTP_AUDIO_FRAME_DUR_NUM 20
-#define DEFAULT_RTP_AUDIO_FRAME_DUR_DEN 1000
-#define DEFAULT_RTP_AUDIO_PACKET_DURATION_MS 20
-#define DEFAULT_RTP_AUDIO_DEFAULT_RATE  8000
-#define DEFAULT_RTP_AUDIO_DEFAULT_CHANNELS 1
-
-#define PTYPE_UNDEFINED (-1)
-
-void mgcp_get_local_addr(char *addr, struct mgcp_conn_rtp *conn);

include/osmocom/mgcp/mgcp_iuup.h

@@ -0,0 +1,33 @@
+/* IuUP connection functionalitites */
+
+/*
+ * (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Pau Espin Pedrol
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include <osmocom/core/msgb.h>
+
+struct mgcp_conn_rtp;
+
+int mgcp_conn_iuup_init(struct mgcp_conn_rtp *conn_rtp);
+void mgcp_conn_iuup_cleanup(struct mgcp_conn_rtp *conn_rtp);
+int mgcp_conn_iuup_dispatch_rtp(struct msgb *msg);
+int mgcp_conn_iuup_send_rtp(struct mgcp_conn_rtp *conn_src_rtp, struct mgcp_conn_rtp *conn_dest_rtp, struct msgb *msg);
+int mgcp_conn_iuup_send_dummy(struct mgcp_conn_rtp *conn_rtp);

include/osmocom/mgcp/mgcp_msg.h

@@ -25,10 +25,12 @@
 #pragma once
 
 #include <stdint.h>
+#include <stdbool.h>
 
 struct mgcp_conn;
 struct mgcp_parse_data;
 struct mgcp_endpoint;
+struct mgcp_trunk;
 
 void mgcp_disp_msg(unsigned char *message, unsigned int len, char *preamble);
 
@@ -39,7 +41,7 @@ int mgcp_parse_header(struct mgcp_parse_data *pdata, char *data);
 
 int mgcp_parse_osmux_cid(const char *line);
 
-int mgcp_check_param(const struct mgcp_endpoint *endp, const char *line);
+bool mgcp_check_param(const struct mgcp_endpoint *endp, struct mgcp_trunk *trunk, const char *line);
 
 int mgcp_verify_call_id(struct mgcp_endpoint *endp, const char *callid);
 

include/osmocom/mgcp/mgcp_network.h

@@ -0,0 +1,189 @@
+#pragma once
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+#include <osmocom/core/socket.h>
+
+#include <osmocom/mgcp/mgcp.h>
+
+/* The following constant defines an RTP dummy payload that is used for
+ * "UDP Hole Punching" (NAT) */
+#define MGCP_DUMMY_LOAD 0x23
+static const char rtp_dummy_payload[] = { MGCP_DUMMY_LOAD };
+
+/* Check if the data in a given message buffer matches the rtp dummy payload
+ * defined above */
+#define mgcp_is_rtp_dummy_payload(msg) \
+	(msgb_length(msg) == sizeof(rtp_dummy_payload) && \
+	memcmp(msgb_data(msg), rtp_dummy_payload, sizeof(rtp_dummy_payload)) == 0)
+
+#define RTP_BUF_SIZE	4096
+
+struct mgcp_rtp_stream_state {
+	uint32_t ssrc;
+	uint16_t last_seq;
+	uint32_t last_timestamp;
+	struct rate_ctr *err_ts_ctr;
+	int32_t last_tsdelta;
+	uint32_t last_arrival_time;
+};
+
+struct mgcp_rtp_state {
+	/* has this state structure been initialized? */
+	int initialized;
+
+	struct {
+		/* are we patching the SSRC value? */
+		bool patch_ssrc;
+		/* original SSRC (to which we shall patch any different SSRC) */
+		uint32_t orig_ssrc;
+		/* offset to apply on the sequence number */
+		int seq_offset;
+		/* offset to apply on the timestamp number */
+		int32_t timestamp_offset;
+	} patch;
+
+	/* duration of a packet (FIXME: in which unit?) */
+	uint32_t packet_duration;
+
+	/* Note: These states are not continuously updated, they serve as an
+	 * information source to patch certain values in the RTP header. Do
+	 * not use this state if constantly updated data about the RTP stream
+	 * is needed. (see also mgcp_patch_and_count() */
+	struct mgcp_rtp_stream_state in_stream;
+	struct mgcp_rtp_stream_state out_stream;
+
+	/* jitter and packet loss calculation */
+	struct {
+		int initialized;
+		uint16_t base_seq;
+		uint16_t max_seq;
+		uint32_t ssrc;
+		uint32_t jitter;
+		int32_t transit;
+		int cycles;
+	} stats;
+
+	/* Alternative values for RTP tx, in case no sufficient header
+	 * information is available so the header needs to be generated
+	 * locally (when just forwarding packets, the header of incoming
+	 * data is just re-used) */
+	uint16_t alt_rtp_tx_sequence;
+	uint32_t alt_rtp_tx_ssrc;
+};
+
+struct mgcp_rtp_codec {
+	uint32_t rate;
+	int channels;
+	uint32_t frame_duration_num;
+	uint32_t frame_duration_den;
+
+	int payload_type;
+	char audio_name[64];
+	char subtype_name[64];
+
+	/* Deprecated. Use the new fmtp string instead. */
+	bool param_present;
+	struct mgcp_codec_param param;
+
+	char fmtp[256];
+};
+
+/* 'mgcp_rtp_end': basically a wrapper around the RTP+RTCP ports */
+struct mgcp_rtp_end {
+	/* remote IP address of the RTP socket */
+	struct osmo_sockaddr addr;
+
+	/* in network byte order */
+	int rtcp_port;
+
+	/* currently selected audio codec */
+	struct mgcp_rtp_codec *codec;
+
+	/* array with assigned audio codecs to choose from (SDP) */
+	struct mgcp_rtp_codec codecs[MGCP_MAX_CODECS];
+
+	/* number of assigned audio codecs (SDP) */
+	unsigned int codecs_assigned;
+
+	/* per endpoint data */
+	int  frames_per_packet;
+	uint32_t packet_duration_ms;
+	int maximum_packet_time; /* -1: not set */
+	/* are we transmitting packets (true) or dropping (false) outbound packets */
+	bool output_enabled;
+	/* FIXME: This parameter can be set + printed, but is nowhere used! */
+	int force_output_ptime;
+
+	/* RTP patching */
+	int force_constant_ssrc; /* -1: always, 0: don't, 1: once */
+	/* should we perform align_rtp_timestamp_offset() (1) or not (0) */
+	int force_aligned_timing;
+	bool rfc5993_hr_convert;
+
+	/* Each end has a separate socket for RTP and RTCP */
+	struct osmo_fd rtp;
+	struct osmo_fd rtcp;
+
+	/* local UDP port number of the RTP socket; RTCP is +1 */
+	int local_port;
+	/* where the endpoint RTP connection binds to, set during CRCX and
+	 * possibly updated during MDCX */
+	char local_addr[INET6_ADDRSTRLEN];
+};
+
+bool mgcp_rtp_end_remote_addr_available(const struct mgcp_rtp_end *rtp_end);
+
+struct mgcp_rtp_tap {
+	/* is this tap active (1) or not (0) */
+	int enabled;
+	/* IP/port to which we're forwarding the tapped data */
+	struct osmo_sockaddr forward;
+};
+
+struct mgcp_conn;
+
+int mgcp_send(struct mgcp_endpoint *endp, int is_rtp, struct osmo_sockaddr *addr,
+	      struct msgb *msg, struct mgcp_conn_rtp *conn_src,
+	      struct mgcp_conn_rtp *conn_dst);
+int mgcp_send_dummy(struct mgcp_endpoint *endp, struct mgcp_conn_rtp *conn);
+int mgcp_dispatch_rtp_bridge_cb(struct msgb *msg);
+void mgcp_cleanup_rtp_bridge_cb(struct mgcp_endpoint *endp, struct mgcp_conn *conn);
+int mgcp_dispatch_e1_bridge_cb(struct msgb *msg);
+void mgcp_cleanup_e1_bridge_cb(struct mgcp_endpoint *endp, struct mgcp_conn *conn);
+int mgcp_bind_net_rtp_port(struct mgcp_endpoint *endp, int rtp_port,
+			   struct mgcp_conn_rtp *conn);
+void mgcp_free_rtp_port(struct mgcp_rtp_end *end);
+void mgcp_patch_and_count(const struct mgcp_endpoint *endp,
+			  struct mgcp_rtp_state *state,
+			  struct mgcp_rtp_end *rtp_end,
+			  struct osmo_sockaddr *addr, struct msgb *msg);
+int mgcp_get_local_addr(char *addr, struct mgcp_conn_rtp *conn);
+
+/* payload processing default functions */
+int mgcp_rtp_processing_default(struct mgcp_endpoint *endp, struct mgcp_rtp_end *dst_end,
+				char *data, int *len, int buf_size);
+
+int mgcp_setup_rtp_processing_default(struct mgcp_endpoint *endp,
+				      struct mgcp_conn_rtp *conn_dst,
+				      struct mgcp_conn_rtp *conn_src);
+
+void mgcp_get_net_downlink_format_default(struct mgcp_endpoint *endp,
+					  const struct mgcp_rtp_codec **codec,
+					  const char **fmtp_extra,
+					  struct mgcp_conn_rtp *conn);
+
+/* internal RTP Annex A counting */
+void mgcp_rtp_annex_count(const struct mgcp_endpoint *endp, struct mgcp_rtp_state *state,
+			const uint16_t seq, const int32_t transit,
+			const uint32_t ssrc, const bool marker_bit);
+
+void rtpconn_rate_ctr_add(struct mgcp_conn_rtp *conn_rtp, struct mgcp_endpoint *endp,
+				 int id, int inc);
+void rtpconn_rate_ctr_inc(struct mgcp_conn_rtp *conn_rtp, struct mgcp_endpoint *endp,
+				 int id);
+void forward_data_tap(int fd, struct mgcp_rtp_tap *tap, struct msgb *msg);
+uint32_t mgcp_get_current_ts(unsigned codec_rate);
+
+int amr_oa_bwe_convert(struct mgcp_endpoint *endp, struct msgb *msg, bool target_is_oa);

include/osmocom/mgcp/mgcp_protocol.h

@@ -0,0 +1,30 @@
+#pragma once
+
+/* Internal structure while parsing a request */
+struct mgcp_parse_data {
+	struct mgcp_config *cfg;
+	char *epname;
+	char *trans;
+	char *save;
+};
+
+/* Local connection options */
+struct mgcp_lco {
+	char *string;
+	char *codec;
+	int pkt_period_min; /* time in ms */
+	int pkt_period_max; /* time in ms */
+};
+
+char *mgcp_debug_get_last_endpoint_name(void);
+
+char *get_lco_identifier(const char *options);
+int check_local_cx_options(void *ctx, const char *options);
+
+struct mgcp_rtp_end;
+struct mgcp_endpoint;
+void mgcp_rtp_end_config(struct mgcp_endpoint *endp, int expect_ssrc_change,
+			 struct mgcp_rtp_end *rtp);
+
+uint32_t mgcp_rtp_packet_duration(const struct mgcp_endpoint *endp,
+				  const struct mgcp_rtp_end *rtp);

include/osmocom/mgcp/mgcp_ratectr.h

@@ -0,0 +1,109 @@
+#pragma once
+
+/* Global MCGP general rate counters */
+enum {
+	MGCP_GENERAL_RX_MSGS_TOTAL,
+	MGCP_GENERAL_RX_MSGS_RETRANSMITTED,
+	MGCP_GENERAL_RX_MSGS_HANDLED,
+	MGCP_GENERAL_RX_MSGS_UNHANDLED,
+	MGCP_GENERAL_RX_FAIL_MSG_PARSE,
+	MGCP_GENERAL_RX_FAIL_NO_ENDPOINT,
+};
+
+/* Trunk-global MCGP CRCX related rate counters */
+enum {
+	MGCP_CRCX_SUCCESS,
+	MGCP_CRCX_FAIL_BAD_ACTION,
+	MGCP_CRCX_FAIL_UNHANDLED_PARAM,
+	MGCP_CRCX_FAIL_MISSING_CALLID,
+	MGCP_CRCX_FAIL_INVALID_MODE,
+	MGCP_CRCX_FAIL_LIMIT_EXCEEDED,
+	MGCP_CRCX_FAIL_UNKNOWN_CALLID,
+	MGCP_CRCX_FAIL_ALLOC_CONN,
+	MGCP_CRCX_FAIL_NO_REMOTE_CONN_DESC,
+	MGCP_CRCX_FAIL_START_RTP,
+	MGCP_CRCX_FAIL_NO_OSMUX,
+	MGCP_CRCX_FAIL_INVALID_CONN_OPTIONS,
+	MGCP_CRCX_FAIL_CODEC_NEGOTIATION,
+	MGCP_CRCX_FAIL_BIND_PORT,
+	MGCP_CRCX_FAIL_AVAIL,
+	MGCP_CRCX_FAIL_CLAIM,
+};
+
+/* Trunk-global MCGP MDCX related rate counters */
+enum {
+	MGCP_MDCX_SUCCESS,
+	MGCP_MDCX_FAIL_WILDCARD,
+	MGCP_MDCX_FAIL_NO_CONN,
+	MGCP_MDCX_FAIL_INVALID_CALLID,
+	MGCP_MDCX_FAIL_INVALID_CONNID,
+	MGCP_MDCX_FAIL_UNHANDLED_PARAM,
+	MGCP_MDCX_FAIL_NO_CONNID,
+	MGCP_MDCX_FAIL_CONN_NOT_FOUND,
+	MGCP_MDCX_FAIL_INVALID_MODE,
+	MGCP_MDCX_FAIL_INVALID_CONN_OPTIONS,
+	MGCP_MDCX_FAIL_NO_REMOTE_CONN_DESC,
+	MGCP_MDCX_FAIL_START_RTP,
+	MGCP_MDCX_FAIL_AVAIL,
+};
+
+/* Trunk-global MCGP DLCX related rate counters */
+enum {
+	MGCP_DLCX_SUCCESS,
+	MGCP_DLCX_FAIL_NO_CONN,
+	MGCP_DLCX_FAIL_INVALID_CALLID,
+	MGCP_DLCX_FAIL_INVALID_CONNID,
+	MGCP_DLCX_FAIL_UNHANDLED_PARAM,
+	MGCP_DLCX_FAIL_AVAIL,
+};
+
+/* Trunk-global E1 related counters */
+enum {
+        E1_I460_TRAU_RX_FAIL_CTR,
+        E1_I460_TRAU_TX_FAIL_CTR,
+        E1_I460_TRAU_MUX_EMPTY_CTR,
+};
+
+/* NOTE: When adding counters, also the dump_ratectr_* routines in vty.c must be updated. */
+
+struct mgcp_ratectr_global {
+	/* Rate counter group which contains stats for generic MGCP events. */
+	struct rate_ctr_group *mgcp_general_ctr_group;
+};
+
+struct mgcp_ratectr_trunk {
+	/* Rate counter group which contains stats for processed CRCX commands. */
+	struct rate_ctr_group *mgcp_crcx_ctr_group;
+	/* Rate counter group which contains stats for processed MDCX commands. */
+	struct rate_ctr_group *mgcp_mdcx_ctr_group;
+	/* Rate counter group which contains stats for processed DLCX commands. */
+	struct rate_ctr_group *mgcp_dlcx_ctr_group;
+	/* Rate counter group which aggregates stats of individual RTP connections. */
+	struct rate_ctr_group *all_rtp_conn_stats;
+	/* Rate counter group which aggregates stats of individual Osmux connections. */
+	struct rate_ctr_group *all_osmux_conn_stats;
+	/* Rate counter group which contains stats for E1 events (only valid for E1 trunks) */
+	struct rate_ctr_group *e1_stats;
+};
+
+struct mgcp_config;
+struct mgcp_trunk;
+
+int mgcp_ratectr_global_alloc(struct mgcp_config *cfg);
+void mgcp_ratectr_global_free(struct mgcp_config *cfg);
+int mgcp_ratectr_trunk_alloc(struct mgcp_trunk *trunk);
+void mgcp_ratectr_trunk_free(struct mgcp_trunk *trunk);
+
+/* Trunk-global common stat items */
+enum {
+	TRUNK_STAT_ENDPOINTS_TOTAL,
+	TRUNK_STAT_ENDPOINTS_USED,
+};
+
+struct mgcp_stat_trunk {
+	/* Stat item group which contains general status values of the trunk. */
+	struct osmo_stat_item_group *common;
+};
+
+int mgcp_stat_trunk_alloc(struct mgcp_trunk *trunk);
+void mgcp_stat_trunk_free(struct mgcp_trunk *trunk);

include/osmocom/mgcp/mgcp_stat.h

@@ -24,7 +24,6 @@
 
 #pragma once
 
-#include <osmocom/mgcp/mgcp_internal.h>
 #include <inttypes.h>
 
 void mgcp_format_stats(char *str, size_t str_len,  struct mgcp_conn *conn);

include/osmocom/mgcp/mgcp_threads_queue.h

@@ -0,0 +1,52 @@
+/*
+ * (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <stdatomic.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+struct spsc {
+	atomic_uint readptr;
+	atomic_uint writeptr;
+
+	int efd_r, efd_w; /* eventfds used to block/notify readers/writers */
+
+	int count;
+	int size_per_buf;
+
+	void *buf; /* buffer size count*size_per_buf */
+	uintptr_t data[0]; /* count sized array of pointers to size_per_buf chunks in buf array*/
+};
+
+struct qchan {
+	struct spsc *a;
+	struct spsc *b;
+};
+
+bool spsc_push(struct spsc *q, void *elem);
+bool spsc_pop(struct spsc *q, void *elem);
+ssize_t spsc_prep_pop(struct spsc *q);
+int spsc_get_a_rdfd(struct qchan *q);
+
+struct qchan spsc_chan_init(void *talloc_ctx, unsigned int count, unsigned int size_per_buf);
+struct qchan spsc_chan_init_ex(void *talloc_ctx, unsigned int count, unsigned int size_per_buf, bool blockr_a,
+			       bool blockw_a, bool blockr_b, bool blockw_b);
+void spsc_chan_close(struct qchan *q);

include/osmocom/mgcp/mgcp_trunk.h

@@ -0,0 +1,85 @@
+#pragma once
+
+#include <osmocom/gsm/i460_mux.h>
+#include <osmocom/abis/e1_input.h>
+#include <osmocom/mgcp/mgcp_ratectr.h>
+
+
+#define LOGPTRUNK(trunk, cat, level, fmt, args...) \
+LOGP(cat, level, "trunk:%u " fmt, \
+     trunk ? trunk->trunk_nr : 0, \
+     ## args)
+
+enum mgcp_trunk_type {
+	MGCP_TRUNK_VIRTUAL,
+	MGCP_TRUNK_E1,
+};
+
+extern const struct value_string mgcp_trunk_type_strs[];
+static inline const char *mgcp_trunk_type_strs_str(enum mgcp_trunk_type val)
+{ return get_value_string(mgcp_trunk_type_strs, val); }
+
+struct mgcp_trunk {
+	struct llist_head entry;
+
+	struct mgcp_config *cfg;
+
+	unsigned int trunk_nr;
+	enum mgcp_trunk_type trunk_type;
+
+	int audio_send_ptime;
+	int audio_send_name;
+
+	int omit_rtcp;
+	int keepalive_interval;
+
+	/* RTP patching */
+	int force_constant_ssrc; /* 0: don't, 1: once */
+	int force_aligned_timing;
+	bool rfc5993_hr_convert;
+
+	/* spec handling */
+	int force_realloc;
+
+	/* timer */
+	struct osmo_timer_list keepalive_timer;
+
+	/* When set, incoming RTP packets are not filtered
+	 * when ports and ip-address do not match (debug) */
+	int rtp_accept_all;
+
+	unsigned int number_endpoints;
+	struct mgcp_endpoint **endpoints;
+
+	/* rate counters and stat items to measure the trunks overall performance and health */
+	struct mgcp_ratectr_trunk ratectr;
+	struct mgcp_stat_trunk stats;
+
+	union {
+		/* Virtual trunk specific */
+		struct {
+			unsigned int vty_number_endpoints;
+		} v;
+		/* E1 specific */
+		struct {
+			unsigned int vty_line_nr;
+			uint8_t ts_usecount[NUM_E1_TS-1];
+			struct osmo_i460_timeslot i460_ts[NUM_E1_TS-1];
+			/* Note: on an E1 line TS 0 is devoted to framing and
+			 * alignment and therefore only NUM_E1_TS-1 timeslots
+			 * are available for traffic. */
+		} e1;
+	};
+};
+
+struct mgcp_trunk *mgcp_trunk_alloc(struct mgcp_config *cfg, enum mgcp_trunk_type ttype, unsigned int nr);
+int mgcp_trunk_equip(struct mgcp_trunk *trunk);
+struct mgcp_trunk *mgcp_trunk_by_num(const struct mgcp_config *cfg, enum mgcp_trunk_type ttype, unsigned int nr);
+struct mgcp_trunk *mgcp_trunk_by_name(const struct mgcp_config *cfg, const char *epname);
+int e1_trunk_nr_from_epname(unsigned int *trunk_nr, const char *epname);
+struct mgcp_trunk *mgcp_trunk_by_line_num(const struct mgcp_config *cfg, unsigned int num);
+
+/* The virtual trunk is always created on trunk id 0 for historical reasons,
+ * use this define constant as ID when allocating a virtual trunk. Other
+ * trunks may be assigned with arbritrary id numbers */
+#define MGCP_VIRT_TRUNK_ID 0

include/osmocom/mgcp/osmux.h

@@ -1,35 +1,39 @@
 #pragma once
 
+#include <stdint.h>
+
+#include <osmocom/core/socket.h>
 
 #include <osmocom/netif/osmux.h>
 struct mgcp_conn_rtp;
+struct mgcp_trunk;
+struct mgcp_endpoint;
+struct mgcp_conn_rtp;
 
-#define OSMUX_PORT	1984
+int osmux_init(struct mgcp_trunk *trunk);
+int osmux_init_conn(struct mgcp_conn_rtp *conn);
+int conn_osmux_enable(struct mgcp_conn_rtp *conn);
+void conn_osmux_disable(struct mgcp_conn_rtp *conn);
+int conn_osmux_event_rx_crcx_mdcx(struct mgcp_conn_rtp *conn);
+int conn_osmux_send_rtp(struct mgcp_conn_rtp *conn, struct msgb *msg);
+int osmux_send_dummy(struct mgcp_conn_rtp *conn);
 
-enum {
-	OSMUX_ROLE_BSC = 0,
-	OSMUX_ROLE_BSC_NAT,
-};
-
-int osmux_init(int role, struct mgcp_config *cfg);
-int osmux_enable_conn(struct mgcp_endpoint *endp, struct mgcp_conn_rtp *conn,
-		      struct in_addr *addr, uint16_t port);
-void osmux_disable_conn(struct mgcp_conn_rtp *conn);
-void osmux_allocate_cid(struct mgcp_conn_rtp *conn);
-void osmux_release_cid(struct mgcp_conn_rtp *conn);
-int osmux_xfrm_to_osmux(char *buf, int buf_len, struct mgcp_conn_rtp *conn);
-int osmux_send_dummy(struct mgcp_endpoint *endp, struct mgcp_conn_rtp *conn);
-int osmux_get_cid(void);
-void osmux_put_cid(uint8_t osmux_cid);
-int osmux_used_cid(void);
+void osmux_cid_pool_get(uint8_t osmux_cid);
+int osmux_cid_pool_get_next(void);
+void osmux_cid_pool_put(uint8_t osmux_cid);
+bool osmux_cid_pool_allocated(uint8_t osmux_cid);
+int osmux_cid_pool_count_used(void);
 
 enum osmux_state {
 	OSMUX_STATE_DISABLED = 0, /* Osmux not being currently used by endp */
-	OSMUX_STATE_NEGOTIATING,  /* Osmux was locally requested in MGCP CRCX */
-	OSMUX_STATE_ACTIVATING,   /* Osmux was accepted in MGCP CRCX ACK. It can now be enabled by \ref osmux_enable_endpoint. */
-	OSMUX_STATE_ENABLED,	  /* Osmux was initialized by \ref osmux_enable_endpoint and can process frames */
+	OSMUX_STATE_ACTIVATING,   /* Osmux was accepted in MGCP CRCX ACK. It can now be enabled by \ref conn_osmux_enable. */
+	OSMUX_STATE_ENABLED,	  /* Osmux was initialized by \ref conn_osmux_enable and can process frames */
 };
 
+extern const struct value_string osmux_state_strs[];
+static inline const char *osmux_state_str(enum osmux_state val)
+{ return get_value_string(osmux_state_strs, val); }
+
 enum osmux_usage {
 	OSMUX_USAGE_OFF = 0,
 	OSMUX_USAGE_ON = 1,

include/osmocom/mgcp/vty.h

@@ -6,3 +6,7 @@ enum mgcp_vty_node {
 	MGCP_NODE = _LAST_OSMOVTY_NODE + 1,
 	TRUNK_NODE,
 };
+
+enum mgw_vty_cmd_attr {
+	MGW_CMD_ATTR_NEWCONN = 0,
+};

include/osmocom/mgcp_client/Makefile.am

@@ -4,6 +4,7 @@ BUILT_SOURCES = \
 
 noinst_HEADERS = \
 	mgcp_client_internal.h \
+	mgcp_client_pool_internal.h \
 	$(NULL)
 
 mgcp_common.h: $(top_srcdir)/include/osmocom/mgcp/mgcp_common.h

include/osmocom/mgcp_client/defs.h

@@ -0,0 +1,7 @@
+#include <osmocom/core/defs.h>
+
+#if BUILDING_LIBOSMOMGCPCLIENT
+# define OSMO_DEPRECATED_OUTSIDE_LIBOSMOMGCPCLIENT(text)
+#else
+# define OSMO_DEPRECATED_OUTSIDE_LIBOSMOMGCPCLIENT(text) OSMO_DEPRECATED(text)
+#endif

include/osmocom/mgcp_client/mgcp_client.h

@@ -3,14 +3,15 @@
 #include <stdint.h>
 #include <arpa/inet.h>
 
+#include <osmocom/mgcp_client/defs.h>
 #include <osmocom/mgcp_client/mgcp_common.h>
 
 /* See also: RFC 3435, chapter 3.5 Transmission over UDP */
-#define MGCP_CLIENT_LOCAL_ADDR_DEFAULT "0.0.0.0"
-#define MGCP_CLIENT_LOCAL_PORT_DEFAULT 2727
+#define MGCP_CLIENT_LOCAL_ADDR_DEFAULT NULL /* INADDR(6)_ANY */
+#define MGCP_CLIENT_LOCAL_PORT_DEFAULT 0
 #define MGCP_CLIENT_REMOTE_ADDR_DEFAULT "127.0.0.1"
 #define MGCP_CLIENT_REMOTE_PORT_DEFAULT 2427
-
+#define MGCP_CLIENT_KEEPALIVE_DEFAULT_ENDP "null"
 #define MGCP_CLIENT_MGW_STR "Configure MGCP connection to Media Gateway\n"
 
 struct msgb;
@@ -26,6 +27,21 @@ struct mgcp_client_conf {
 	/* By default, we are always addressing the MGW with e.g. 'rtpbridge/123@mgw'.
 	 * If this is nonempty, the contained name will be used instead of 'mgw'. */
 	char endpoint_domain_name[MGCP_ENDPOINT_MAXLEN];
+
+	/* The user may configure certain endpoint names that are reset via DLCX
+	 * on startup. Usually this will be one wildcarded endpoint e.g.
+	 * 'rtpbridge/(wildcard)' or a number of specific E1 like e.g.
+	 * 'ds/e1-0/s-3/su16-4' */
+	struct llist_head reset_epnames;
+
+	/* human readable name / description */
+	char *description;
+
+	struct {
+		uint32_t timeout_sec;
+		uint32_t req_interval_sec;
+		char req_endpoint_name[MGCP_ENDPOINT_MAXLEN];
+	} keepalive;
 };
 
 typedef unsigned int mgcp_trans_id_t;
@@ -36,10 +52,12 @@ enum mgcp_codecs {
 	CODEC_GSM_8000_1 = 3,
 	CODEC_PCMA_8000_1 = 8,
 	CODEC_G729_8000_1 = 18,
-	CODEC_GSMEFR_8000_1 = 110,
-	CODEC_GSMHR_8000_1 = 111,	
-	CODEC_AMR_8000_1 = 112,
-	CODEC_AMRWB_16000_1 = 113,
+	CODEC_GSMEFR_8000_1 = 110,	/* 3GPP TS 48.103 table 5.4.2.2.1 */
+	CODEC_GSMHR_8000_1 = 111,	/* 3GPP TS 48.103 table 5.4.2.2.1 */
+	CODEC_AMR_8000_1 = 112,		/* 3GPP TS 48.103 table 5.4.2.2.1 */
+	CODEC_AMRWB_16000_1 = 113,	/* 3GPP TS 48.103 table 5.4.2.2.1 */
+	CODEC_IUFP = 96,
+	CODEC_CLEARMODE = 120,		/* 3GPP TS 48.103 table 5.4.2.2.1 */
 };
 /* Note: when new codec types are added, the corresponding value strings
  * in mgcp_client.c (codec_table) must be updated as well. Enumerations
@@ -47,6 +65,10 @@ enum mgcp_codecs {
  * this is an internal assumption that is made to avoid lookup tables.
  * The API-User should not rely on this coincidence! */
 
+extern const struct value_string osmo_mgcpc_codec_names[];
+static inline const char *osmo_mgcpc_codec_name(enum mgcp_codecs val)
+{ return get_value_string(osmo_mgcpc_codec_names, val); }
+
 /*! Structure to build a payload type map to allow the defiition custom payload
  *  types. */
 struct ptmap {
@@ -55,27 +77,12 @@ struct ptmap {
 
 	/*! payload type number (96-127) */
 	unsigned int pt;
+
+	/*! the MGCP 'a=fmtp:N <...>' string, e.g. "mode-set=1,2,3;octet-align=0". */
+	char fmtp[256];
 };
 
-struct mgcp_response_head {
-	int response_code;
-	mgcp_trans_id_t trans_id;
-	char comment[MGCP_COMMENT_MAXLEN];
-	char conn_id[MGCP_CONN_ID_MAXLEN];
-	char endpoint[MGCP_ENDPOINT_MAXLEN];
-};
-
-struct mgcp_response {
-	char *body;
-	struct mgcp_response_head head;
-	uint16_t audio_port;
-	char audio_ip[INET_ADDRSTRLEN];
-	unsigned int ptime;
-	enum mgcp_codecs codecs[MGCP_MAX_CODECS];
-	unsigned int codecs_len;
-	struct ptmap ptmap[MGCP_MAX_CODECS];
-	unsigned int ptmap_len;	
-};
+int ptmap_cmp(const struct ptmap *a, const struct ptmap *b);
 
 enum mgcp_verb {
 	MGCP_VERB_CRCX,
@@ -85,33 +92,8 @@ enum mgcp_verb {
 	MGCP_VERB_RSIP,
 };
 
-#define MGCP_MSG_PRESENCE_ENDPOINT	0x0001
-#define MGCP_MSG_PRESENCE_CALL_ID	0x0002
-#define MGCP_MSG_PRESENCE_CONN_ID	0x0004
-#define MGCP_MSG_PRESENCE_AUDIO_IP	0x0008
-#define MGCP_MSG_PRESENCE_AUDIO_PORT	0x0010
-#define MGCP_MSG_PRESENCE_CONN_MODE	0x0020
-#define MGCP_MSG_PRESENCE_X_OSMO_IGN	0x8000
-
-struct mgcp_msg {
-	enum mgcp_verb verb;
-	/* See MGCP_MSG_PRESENCE_* constants */
-	uint32_t presence;
-	char endpoint[MGCP_ENDPOINT_MAXLEN];
-	unsigned int call_id;
-	char *conn_id;
-	uint16_t audio_port;
-	char *audio_ip;
-	enum mgcp_connection_mode conn_mode;
-	unsigned int ptime;
-	enum mgcp_codecs codecs[MGCP_MAX_CODECS];
-	unsigned int codecs_len;
-	struct ptmap ptmap[MGCP_MAX_CODECS];
-	unsigned int ptmap_len;
-	uint32_t x_osmo_ign;
-};
-
-void mgcp_client_conf_init(struct mgcp_client_conf *conf);
+struct mgcp_client_conf *mgcp_client_conf_alloc(void *ctx);
+void mgcp_client_conf_init(struct mgcp_client_conf *conf) OSMO_DEPRECATED_OUTSIDE_LIBOSMOMGCPCLIENT("use mgcp_client_conf_alloc() (or even better, switch to the mgcp_client_pool API!)");
 void mgcp_client_vty_init(void *talloc_ctx, int node, struct mgcp_client_conf *conf);
 int mgcp_client_config_write(struct vty *vty, const char *indent);
 struct mgcp_client_conf *mgcp_client_conf_actual(struct mgcp_client *mgcp);
@@ -119,28 +101,20 @@ struct mgcp_client_conf *mgcp_client_conf_actual(struct mgcp_client *mgcp);
 struct mgcp_client *mgcp_client_init(void *ctx,
 				     struct mgcp_client_conf *conf);
 int mgcp_client_connect(struct mgcp_client *mgcp);
+int mgcp_client_connect2(struct mgcp_client *mgcp, unsigned int retry_n_ports) OSMO_DEPRECATED("Use mgcp_client_connect() instead");
+void mgcp_client_disconnect(struct mgcp_client *mgcp);
 
 const char *mgcp_client_remote_addr_str(struct mgcp_client *mgcp);
 uint16_t mgcp_client_remote_port(struct mgcp_client *mgcp);
-uint32_t mgcp_client_remote_addr_n(struct mgcp_client *mgcp);
+uint32_t mgcp_client_remote_addr_n(struct mgcp_client *mgcp) OSMO_DEPRECATED("deprecated, returns 0");
 
 const char *mgcp_client_endpoint_domain(const struct mgcp_client *mgcp);
 const char *mgcp_client_rtpbridge_wildcard(const struct mgcp_client *mgcp);
-
-/* Invoked when an MGCP response is received or sending failed.  When the
- * response is passed as NULL, this indicates failure during transmission. */
-typedef void (* mgcp_response_cb_t )(struct mgcp_response *response, void *priv);
-int mgcp_response_parse_params(struct mgcp_response *r);
-
-int mgcp_client_tx(struct mgcp_client *mgcp, struct msgb *msg,
-		   mgcp_response_cb_t response_cb, void *priv);
-int mgcp_client_cancel(struct mgcp_client *mgcp, mgcp_trans_id_t trans_id);
+const char *mgcp_client_e1_epname(void *ctx, const struct mgcp_client *mgcp, uint8_t trunk_id, uint8_t ts,
+				  uint8_t rate, uint8_t offset);
 
 enum mgcp_connection_mode;
 
-struct msgb *mgcp_msg_gen(struct mgcp_client *mgcp, struct mgcp_msg *mgcp_msg);
-mgcp_trans_id_t mgcp_msg_trans_id(struct msgb *msg);
-
 extern const struct value_string mgcp_client_connection_mode_strs[];
 static inline const char *mgcp_client_cmode_name(enum mgcp_connection_mode mode)
 {
@@ -148,7 +122,9 @@ static inline const char *mgcp_client_cmode_name(enum mgcp_connection_mode mode)
 }
 
 enum mgcp_codecs map_str_to_codec(const char *str);
-unsigned int map_codec_to_pt(struct ptmap *ptmap, unsigned int ptmap_len,
+unsigned int map_codec_to_pt(const struct ptmap *ptmap, unsigned int ptmap_len,
 			     enum mgcp_codecs codec);
 enum mgcp_codecs map_pt_to_codec(struct ptmap *ptmap, unsigned int ptmap_len,
 				 unsigned int pt);
+
+const char *mgcp_client_name(const struct mgcp_client *mgcp);

include/osmocom/mgcp_client/mgcp_client_endpoint_fsm.h

@@ -0,0 +1,55 @@
+/* FSM to manage multiple connections of an MGW endpoint */
+#pragma once
+
+#include <osmocom/mgcp_client/mgcp_client_fsm.h>
+
+#define LOG_MGCPC_EP(ep, level, fmt, args...) do { \
+	LOGPFSML(ep->fi, level, "%s " fmt, \
+		 osmo_mgcpc_ep_name(ep), ## args); \
+	} while(0)
+
+struct osmo_mgcpc_ep;
+struct osmo_mgcpc_ep_ci;
+struct osmo_tdef;
+
+struct osmo_mgcpc_ep *osmo_mgcpc_ep_alloc(struct osmo_fsm_inst *parent, uint32_t parent_term_event,
+					  struct mgcp_client *mgcp_client,
+					  const struct osmo_tdef *T_defs,
+					  const char *fsm_id,
+					  const char *endpoint_str_fmt, ...);
+
+struct osmo_mgcpc_ep_ci *osmo_mgcpc_ep_ci_add(struct osmo_mgcpc_ep *ep, const char *label_fmt, ...);
+const struct mgcp_conn_peer *osmo_mgcpc_ep_ci_get_rtp_info(const struct osmo_mgcpc_ep_ci *ci);
+bool osmo_mgcpc_ep_ci_get_crcx_info_to_sockaddr(const struct osmo_mgcpc_ep_ci *ci, struct sockaddr_storage *dest);
+bool osmo_mgcpc_ep_ci_get_crcx_info_to_osmux_cid(const struct osmo_mgcpc_ep_ci *ci, uint8_t* cid);
+
+const struct mgcp_conn_peer *osmo_mgcpc_ep_ci_get_remote_rtp_info(const struct osmo_mgcpc_ep_ci *ci);
+
+void osmo_mgcpc_ep_ci_request(struct osmo_mgcpc_ep_ci *ci,
+			      enum mgcp_verb verb, const struct mgcp_conn_peer *verb_info,
+			      struct osmo_fsm_inst *notify,
+			      uint32_t event_success, uint32_t event_failure,
+			      void *notify_data);
+
+void osmo_mgcpc_ep_cancel_notify(struct osmo_mgcpc_ep *ep, struct osmo_fsm_inst *notify);
+struct osmo_mgcpc_ep *osmo_mgcpc_ep_ci_ep(struct osmo_mgcpc_ep_ci *ci);
+
+/*! Dispatch a DLCX for the given connection.
+ * \param ci  Connection identifier as obtained from osmo_mgcpc_ep_ci_add().
+ */
+static inline void osmo_mgcpc_ep_ci_dlcx(struct osmo_mgcpc_ep_ci *ci)
+{
+	osmo_mgcpc_ep_ci_request(ci, MGCP_VERB_DLCX, NULL, NULL, 0, 0, NULL);
+}
+
+void osmo_mgcpc_ep_clear(struct osmo_mgcpc_ep *ep);
+
+const char *osmo_mgcpc_ep_name(const struct osmo_mgcpc_ep *ep);
+const char *osmo_mgcpc_ep_local_name(const struct osmo_mgcpc_ep *ep);
+const char *osmo_mgcpc_ep_ci_name(const struct osmo_mgcpc_ep_ci *ci);
+const char *osmo_mgcpc_ep_ci_id(const struct osmo_mgcpc_ep_ci *ci);
+struct mgcp_client *osmo_mgcpc_ep_client(const struct osmo_mgcpc_ep *ep);
+
+extern const struct value_string osmo_mgcp_verb_names[];
+static inline const char *osmo_mgcp_verb_name(enum mgcp_verb val)
+{ return get_value_string(osmo_mgcp_verb_names, val); }

include/osmocom/mgcp_client/mgcp_client_fsm.h

@@ -8,14 +8,14 @@
  *  (either remote or local). It is used to pass parameters (local) to the FSM
  *  and get responses (remote) from the FSM as pointer attached to the FSM
  *  event.
- * 
+ *
  *  When modifiying a connection, the endpoint and call_id members may be left
  *  unpopulated. The call_id field is ignored in this case. If an endpoint
  *  identifier is supplied it is checked against the internal state to make
  *  sure it is correct. */
 struct mgcp_conn_peer {
 	/*! RTP connection IP-Address (optional, string e.g. "127.0.0.1") */
-	char addr[INET_ADDRSTRLEN];
+	char addr[INET6_ADDRSTRLEN];
 
 	/*! RTP connection IP-Port (optional)  */
 	uint16_t port;
@@ -29,11 +29,11 @@ struct mgcp_conn_peer {
 	/*! RTP packetization interval (optional) */
 	unsigned int ptime;
 
-	/*! RTP codec list (optional) */
-	enum mgcp_codecs codecs[MGCP_MAX_CODECS];
-
-	/*! Number of codecs in RTP codec list (optional) */
-	unsigned int codecs_len;
+	/*! Deprecated. Use only ptmap[].codec in new code. */
+	enum mgcp_codecs codecs[MGCP_MAX_CODECS]
+		OSMO_DEPRECATED_OUTSIDE_LIBOSMOMGCPCLIENT("use ptmap[i].codec instead");
+	unsigned int codecs_len
+		OSMO_DEPRECATED_OUTSIDE_LIBOSMOMGCPCLIENT("use ptmap[] and ptmap_len instead");
 
 	/*! RTP payload type map (optional, only needed when payload types are
 	 * used that differ from what IANA/3GPP defines) */
@@ -47,11 +47,33 @@ struct mgcp_conn_peer {
 	 * known to issue incoherent or unknown CallIDs / to issue CRCX commands with a different domain
 	 * name than the BSC. An OsmoMGW will then ignore these and not fail on mismatches. */
 	uint32_t x_osmo_ign;
+
+	/*! send 'X-Osmux: %d' header (or "*" as wildcard). */
+	bool x_osmo_osmux_use;
+	/*! -1 means send wildcard. */
+	int x_osmo_osmux_cid;
+
+	/*! If left MGCP_CONN_NONE, use MGCP_CONN_RECV_ONLY or MGCP_CONN_RECV_SEND, depending on whether an audio RTP
+	 * address is set. If != MGCP_CONN_NONE, force this conn mode. */
+	enum mgcp_connection_mode conn_mode;
+
+	/*! Deprectated, use ptmap[].fmtp instead.
+	 * Global codec params. In case the codec requires additional format parameters (fmtp), those can be set
+	 * here, see also mgcp_common.h. The format parameters will be applied on all codecs where applicable. */
+	bool param_present OSMO_DEPRECATED_OUTSIDE_LIBOSMOMGCPCLIENT("use ptmap[].fmtp instead");
+	struct mgcp_codec_param param OSMO_DEPRECATED_OUTSIDE_LIBOSMOMGCPCLIENT("use ptmap[].fmtp instead");
 };
 
 struct osmo_fsm_inst *mgcp_conn_create(struct mgcp_client *mgcp, struct osmo_fsm_inst *parent_fi, uint32_t parent_term_evt,
-				       uint32_t parent_evt, struct mgcp_conn_peer *conn_peer);
-int mgcp_conn_modify(struct osmo_fsm_inst *fi, uint32_t parent_evt, struct mgcp_conn_peer *conn_peer);
-void mgcp_conn_delete(struct osmo_fsm_inst *fi);
+				       uint32_t parent_evt, struct mgcp_conn_peer *conn_peer)
+	OSMO_DEPRECATED_OUTSIDE_LIBOSMOMGCPCLIENT("use osmo_mgcpc_ep_alloc() and osmo_mgcpc_ep_ci_add() instead");
+int mgcp_conn_modify(struct osmo_fsm_inst *fi, uint32_t parent_evt, struct mgcp_conn_peer *conn_peer)
+	OSMO_DEPRECATED_OUTSIDE_LIBOSMOMGCPCLIENT("use osmo_mgcpc_ep_ci_request() instead");
+void mgcp_conn_delete(struct osmo_fsm_inst *fi)
+	OSMO_DEPRECATED_OUTSIDE_LIBOSMOMGCPCLIENT("use osmo_mgcpc_ep_ci_dlcx() instead");
 
-const char *mgcp_conn_get_ci(struct osmo_fsm_inst *fi);
+const char *mgcp_conn_get_ci(struct osmo_fsm_inst *fi)
+	OSMO_DEPRECATED_OUTSIDE_LIBOSMOMGCPCLIENT("use osmo_mgcpc_ep_ci.mgcp_ci_str instead");
+struct mgcp_client *mgcp_conn_get_client(struct osmo_fsm_inst *fi);
+
+const char *osmo_mgcpc_conn_peer_name(const struct mgcp_conn_peer *info);

include/osmocom/mgcp_client/mgcp_client_internal.h

@@ -1,23 +1,51 @@
 #pragma once
 
 #include <osmocom/core/write_queue.h>
+#include <osmocom/core/timer.h>
 
 #define MSGB_CB_MGCP_TRANS_ID 0
 
+/* Struct that holds one endpoint name */
+struct reset_ep {
+	struct llist_head list;
+	char name[MGCP_ENDPOINT_MAXLEN];
+};
+
 struct mgcp_client {
 	struct mgcp_client_conf actual;
-	uint32_t remote_addr;
 	struct osmo_wqueue wq;
 	mgcp_trans_id_t next_trans_id;
 	struct llist_head responses_pending;
-	struct llist_head inuse_endpoints;
+	struct mgcp_client_pool_member *pool_member;
+	struct osmo_timer_list keepalive_tx_timer;
+	struct osmo_timer_list keepalive_rx_timer;
+	bool conn_up;
 };
 
-struct mgcp_inuse_endpoint {
-	struct llist_head entry;
-	uint16_t id;
+struct mgcp_response_head {
+	int response_code;
+	mgcp_trans_id_t trans_id;
+	char comment[MGCP_COMMENT_MAXLEN];
+	char conn_id[MGCP_CONN_ID_MAXLEN];
+	char endpoint[MGCP_ENDPOINT_MAXLEN];
+	bool x_osmo_osmux_use;
+	uint8_t x_osmo_osmux_cid;
 };
 
+struct mgcp_response {
+	char *body;
+	struct mgcp_response_head head;
+	uint16_t audio_port;
+	char audio_ip[INET6_ADDRSTRLEN];
+	unsigned int ptime;
+	struct ptmap ptmap[MGCP_MAX_CODECS];
+	unsigned int ptmap_len;
+};
+
+/* Invoked when an MGCP response is received or sending failed.  When the
+ * response is passed as NULL, this indicates failure during transmission. */
+typedef void (*mgcp_response_cb_t)(struct mgcp_response *response, void *priv);
+
 struct mgcp_response_pending {
 	struct llist_head entry;
 
@@ -33,3 +61,41 @@ struct mgcp_response_pending * mgcp_client_pending_add(
 					mgcp_trans_id_t trans_id,
 					mgcp_response_cb_t response_cb,
 					void *priv);
+
+#define MGCP_MSG_PRESENCE_ENDPOINT	0x0001
+#define MGCP_MSG_PRESENCE_CALL_ID	0x0002
+#define MGCP_MSG_PRESENCE_CONN_ID	0x0004
+#define MGCP_MSG_PRESENCE_AUDIO_IP	0x0008
+#define MGCP_MSG_PRESENCE_AUDIO_PORT	0x0010
+#define MGCP_MSG_PRESENCE_CONN_MODE	0x0020
+#define MGCP_MSG_PRESENCE_X_OSMO_OSMUX_CID 0x4000
+#define MGCP_MSG_PRESENCE_X_OSMO_IGN	0x8000
+
+struct mgcp_msg {
+	enum mgcp_verb verb;
+	/* See MGCP_MSG_PRESENCE_* constants */
+	uint32_t presence;
+	char endpoint[MGCP_ENDPOINT_MAXLEN];
+	unsigned int call_id;
+	char *conn_id;
+	uint16_t audio_port;
+	char *audio_ip;
+	enum mgcp_connection_mode conn_mode;
+	unsigned int ptime;
+	struct ptmap ptmap[MGCP_MAX_CODECS];
+	unsigned int ptmap_len;
+	uint32_t x_osmo_ign;
+	bool x_osmo_osmux_use;
+	int x_osmo_osmux_cid; /* -1 is wildcard */
+	bool param_present;
+	struct mgcp_codec_param param;
+};
+
+int mgcp_response_parse_params(struct mgcp_response *r);
+
+int mgcp_client_tx(struct mgcp_client *mgcp, struct msgb *msg,
+		   mgcp_response_cb_t response_cb, void *priv);
+int mgcp_client_cancel(struct mgcp_client *mgcp, mgcp_trans_id_t trans_id);
+
+struct msgb *mgcp_msg_gen(struct mgcp_client *mgcp, struct mgcp_msg *mgcp_msg);
+mgcp_trans_id_t mgcp_msg_trans_id(struct msgb *msg);

include/osmocom/mgcp_client/mgcp_client_pool.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <stdbool.h>
+
+#include <osmocom/vty/vty.h>
+
+struct mgcp_client;
+struct mgcp_client_pool;
+struct mgcp_client_pool_member;
+
+struct mgcp_client_pool *mgcp_client_pool_alloc(void *talloc_ctx);
+
+void mgcp_client_pool_vty_init(int parent_node, int mgw_node, const char *indent, struct mgcp_client_pool *pool);
+int mgcp_client_pool_config_write(struct vty *vty, const char *indent);
+unsigned int mgcp_client_pool_connect(struct mgcp_client_pool *pool);
+void mgcp_client_pool_register_single(struct mgcp_client_pool *pool, struct mgcp_client *mgcp_client);
+bool mgcp_client_pool_empty(const struct mgcp_client_pool *pool);
+
+struct mgcp_client *mgcp_client_pool_get(struct mgcp_client_pool *pool);
+void mgcp_client_pool_put(struct mgcp_client *mgcp_client);
+
+struct mgcp_client_pool_member *mgcp_client_pool_find_member_by_nr(struct mgcp_client_pool *pool, unsigned int nr);
+struct mgcp_client *mgcp_client_pool_member_get(struct mgcp_client_pool_member *pool_member);
+bool mgcp_client_pool_member_is_blocked(const struct mgcp_client_pool_member *pool_member);

include/osmocom/mgcp_client/mgcp_client_pool_internal.h

@@ -0,0 +1,52 @@
+#pragma once
+
+/* Struct to handle a pool of MGWs. (Use _pool functions) */
+struct mgcp_client_pool {
+
+	/* A pointer to a 'single' mgcp client. This is a non-pooled MGCP client that is configured using
+	 * mgcp_client_vty_init() and actively registered by the API user using mgcp_client_pool_register_single() */
+	struct mgcp_client *mgcp_client_single;
+
+	/* A list that manages the pool members (see mgcp_client_pool_member->list above) */
+	struct llist_head member_list;
+
+	/* String to use for indentation when writing the configuration file to the VTY. This field is populated by
+	 * mgcp_client_pool_vty_init() */
+	char *vty_indent;
+
+	/* VTY node specification used with this pool. This field is populated by mgcp_client_pool_vty_init() */
+	struct cmd_node *vty_node;
+};
+
+/* Struct to handle a member of a pool of MGWs. */
+struct mgcp_client_pool_member {
+	/* Entry in llist mgcp_client_pool->pool. */
+	struct llist_head list;
+
+	/* The pool managing this object: */
+	struct mgcp_client_pool *pool;
+
+	/* Reference number assinged by VTY. This number is used to manage the pool from the VTY and to identify it in
+	 * the log. */
+	unsigned int nr;
+
+	/* MGCP client configuration, this is not the running configuration, when mgcp_client_init() is executed, a
+	 * copy of this config is created. */
+	struct mgcp_client_conf conf;
+
+	/* MGCP client descriptor, will be automatically allocated when mgcp_client_pool_connect() is called. (the MGCP
+	 * client is connected when this pointer is populated) */
+	struct mgcp_client *client;
+
+	/* A pool member may be set as 'blocked' from the VTY, this means that the pool member may still work and serve
+	 * ongoing calls, but it won't be picked from the pool anymore. */
+	bool blocked;
+
+	/* Reference counter to count how often this pool member is currently picked. */
+	unsigned int refcount;
+};
+
+struct mgcp_client_pool_member *mgcp_client_pool_member_alloc(struct mgcp_client_pool *pool, unsigned int nr);
+void mgcp_client_pool_member_free(struct mgcp_client_pool_member *pool_member);
+int mgcp_client_pool_member_reinit_client(struct mgcp_client_pool_member *pool_member);
+const char *mgcp_client_pool_member_name(const struct mgcp_client_pool_member *pool_member);

include/osmocom/sdp/fmtp.h

@@ -0,0 +1,33 @@
+/* Public API for codec management in SDP messages: managing SDP fmtp strings. */
+/*
+ * (C) 2024 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved.
+ *
+ * Author: Neels Janosch Hofmeyr <nhofmeyr@sysmocom.de>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include <stddef.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+bool osmo_sdp_fmtp_get_val(char *val, size_t val_size, const char *fmtp, const char *option_name);
+int64_t osmo_sdp_fmtp_get_int(const char *fmtp, const char *option_name, int64_t default_value);
+
+bool osmo_sdp_fmtp_amr_is_octet_aligned(const char *fmtp);

include/osmocom/sdp/sdp_strings.h

@@ -0,0 +1,36 @@
+/* Central definition of string tokens used for parsing and composing SDP messages */
+#pragma once
+
+#define OSMO_SDP_STR_MEDIA "m"
+#define OSMO_SDP_STR_ATTRIB "a"
+#define OSMO_SDP_STR_TIME_ACTIVE "t"
+
+#define OSMO_SDP_STR_RTPMAP "rtpmap"
+#define OSMO_SDP_STR_FMTP "fmtp"
+#define OSMO_SDP_STR_PTIME "ptime"
+
+/*! "a=foo:" */
+#define OSMO_SDP_A_PREFIX(STR) OSMO_SDP_STR_ATTRIB "=" STR ":"
+
+/* Media Direction Attributes "a=recvonly", "a=sendrecv", "a=sendonly", "a=inactive" RFC-8866 6.7. */
+#define OSMO_SDP_STR_RECVONLY "recvonly"
+#define OSMO_SDP_STR_SENDRECV "sendrecv"
+#define OSMO_SDP_STR_SENDONLY "sendonly"
+#define OSMO_SDP_STR_INACTIVE "inactive"
+
+/* AMR related tokens */
+
+#define OSMO_SDP_STR_AMR_OCTET_ALIGN "octet-align"
+
+/*! "octet-align=1" */
+#define OSMO_SDP_STR_AMR_OCTET_ALIGN_1  OSMO_SDP_STR_AMR_OCTET_ALIGN "=1"
+
+/*! "octet-align=0".
+ * According to spec [1], "octet-align=0" is identical to omitting 'octet-align' entirely. In Osmocom practice, whether
+ * or not "octet-align=0" is present can make a big difference for osmo-mgw versions 1.12 and older, which do not heed
+ * [1].
+ *
+ * spec [1]: RFC4867, see details in description of osmo_sdp_fmtp_amr_is_octet_aligned().
+ */
+#define OSMO_SDP_STR_AMR_OCTET_ALIGN_0  OSMO_SDP_STR_AMR_OCTET_ALIGN "=0"
+

m4/ax_check_compile_flag.m4

@@ -1,74 +0,0 @@
-# ===========================================================================
-#   http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
-#
-# DESCRIPTION
-#
-#   Check whether the given FLAG works with the current language's compiler
-#   or gives an error.  (Warnings, however, are ignored)
-#
-#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
-#   success/failure.
-#
-#   If EXTRA-FLAGS is defined, it is added to the current language's default
-#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
-#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
-#   force the compiler to issue an error when a bad flag is given.
-#
-#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
-#
-#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
-#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
-#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
-#
-#   This program is free software: you can redistribute it and/or modify it
-#   under the terms of the GNU General Public License as published by the
-#   Free Software Foundation, either version 3 of the License, or (at your
-#   option) any later version.
-#
-#   This program is distributed in the hope that it will be useful, but
-#   WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-#   Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
-
-#serial 4
-
-AC_DEFUN([AX_CHECK_COMPILE_FLAG],
-[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
-AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
-AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
-  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
-  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
-  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
-    [AS_VAR_SET(CACHEVAR,[yes])],
-    [AS_VAR_SET(CACHEVAR,[no])])
-  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
-AS_VAR_IF(CACHEVAR,yes,
-  [m4_default([$2], :)],
-  [m4_default([$3], :)])
-AS_VAR_POPDEF([CACHEVAR])dnl
-])dnl AX_CHECK_COMPILE_FLAGS

osmoappdesc.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # (C) 2013 by Katerina Barone-Adesi <kat.obsc@gmail.com>
 # This program is free software: you can redistribute it and/or modify

src/Makefile.am

@@ -13,14 +13,9 @@ AM_CFLAGS = \
 	$(COVERAGE_CFLAGS) \
 	$(NULL)
 
-AM_LDFLAGS = \
-	$(LIBOSMOCORE_LIBS) \
-	$(LIBOSMOGSM_LIBS) \
-	$(COVERAGE_LDFLAGS) \
-	$(NULL)
-
 # Libraries
 SUBDIRS = \
+	libosmo-sdp \
 	libosmo-mgcp-client \
 	libosmo-mgcp \
 	$(NULL)

src/libosmo-mgcp-client/Makefile.am

@@ -9,18 +9,17 @@ AM_CFLAGS = \
 	-Wall \
 	$(LIBOSMOCORE_CFLAGS) \
 	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
 	$(COVERAGE_CFLAGS) \
 	$(NULL)
 
 AM_LDFLAGS = \
-	$(LIBOSMOCORE_LIBS) \
-	$(LIBOSMOVTY_LIBS) \
 	$(COVERAGE_LDFLAGS) \
 	$(NULL)
 
 # This is not at all related to the release version, but a range of supported
 # API versions. Read TODO_RELEASE in the source tree's root!
-MGCP_CLIENT_LIBVERSION=5:0:0
+MGCP_CLIENT_LIBVERSION=13:0:1
 
 lib_LTLIBRARIES = \
 	libosmo-mgcp-client.la \
@@ -30,6 +29,18 @@ libosmo_mgcp_client_la_SOURCES = \
 	mgcp_client.c \
 	mgcp_client_vty.c \
 	mgcp_client_fsm.c \
+	mgcp_client_endpoint_fsm.c \
+	mgcp_client_pool.c \
 	$(NULL)
 
-libosmo_mgcp_client_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(MGCP_CLIENT_LIBVERSION)
+libosmo_mgcp_client_la_LDFLAGS = \
+	$(AM_LDFLAGS) \
+	-version-info $(MGCP_CLIENT_LIBVERSION) \
+	-no-undefined \
+	$(NULL)
+
+libosmo_mgcp_client_la_LIBADD = \
+	$(top_builddir)/src/libosmo-sdp/libosmo-sdp.la \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(NULL)

src/libosmo-mgcp-client/mgcp_client_fsm.c

@@ -19,12 +19,14 @@
  */
 
 #include <osmocom/mgcp_client/mgcp_client.h>
+#include <osmocom/mgcp_client/mgcp_client_internal.h>
 #include <osmocom/mgcp_client/mgcp_client_fsm.h>
 #include <osmocom/core/utils.h>
 #include <osmocom/core/fsm.h>
 #include <osmocom/core/byteswap.h>
 #include <arpa/inet.h>
 #include <osmocom/core/logging.h>
+#include <osmocom/core/sockaddr_str.h>
 
 /* Context information, this is attached to the priv pointer of the FSM and
  * is also handed back when dispatcheing events to the parent FSM. This is
@@ -113,25 +115,46 @@ static void make_crcx_msg(struct mgcp_msg *mgcp_msg, struct mgcp_conn_peer *info
 		.call_id = info->call_id,
 		.conn_mode = MGCP_CONN_RECV_ONLY,
 		.ptime = info->ptime,
-		.codecs_len = info->codecs_len,
-		.ptmap_len = info->ptmap_len
+		.ptmap_len = info->ptmap_len,
+		.param_present = info->param_present
 	};
 	osmo_strlcpy(mgcp_msg->endpoint, info->endpoint, MGCP_ENDPOINT_MAXLEN);
-	memcpy(mgcp_msg->codecs, info->codecs, sizeof(mgcp_msg->codecs));
 	memcpy(mgcp_msg->ptmap, info->ptmap, sizeof(mgcp_msg->ptmap));
+	memcpy(&mgcp_msg->param, &info->param, sizeof(mgcp_msg->param));
 
 	if (info->x_osmo_ign) {
 		mgcp_msg->x_osmo_ign = info->x_osmo_ign;
 		mgcp_msg->presence |= MGCP_MSG_PRESENCE_X_OSMO_IGN;
 	}
+
+	if (info->x_osmo_osmux_use) {
+		mgcp_msg->x_osmo_osmux_cid = info->x_osmo_osmux_cid;
+		mgcp_msg->presence |= MGCP_MSG_PRESENCE_X_OSMO_OSMUX_CID;
+	}
 }
 
 static void add_audio(struct mgcp_msg *mgcp_msg, struct mgcp_conn_peer *info)
 {
-	mgcp_msg->presence |= MGCP_MSG_PRESENCE_AUDIO_IP | MGCP_MSG_PRESENCE_AUDIO_PORT;
-	mgcp_msg->audio_ip = info->addr;
-	mgcp_msg->audio_port = info->port;
-	mgcp_msg->conn_mode = MGCP_CONN_RECV_SEND;
+	bool ip_is_set = info->addr[0] != '\0' &&
+			 strncmp(info->addr, "::", sizeof(info->addr)) != 0 &&
+			 strncmp(info->addr, "0.0.0.0", sizeof(info->addr)) != 0;
+	if (ip_is_set) {
+		mgcp_msg->presence |= MGCP_MSG_PRESENCE_AUDIO_IP;
+		mgcp_msg->audio_ip = info->addr;
+	}
+	if (info->port) {
+		mgcp_msg->presence |= MGCP_MSG_PRESENCE_AUDIO_PORT;
+		mgcp_msg->audio_port = info->port;
+	}
+	if (ip_is_set && info->port)
+		mgcp_msg->conn_mode = MGCP_CONN_RECV_SEND;
+}
+
+static void set_conn_mode(struct mgcp_msg *mgcp_msg, struct mgcp_conn_peer *peer)
+{
+	enum mgcp_connection_mode conn_mode = peer->conn_mode;
+	if (conn_mode != MGCP_CONN_NONE)
+		mgcp_msg->conn_mode = conn_mode;
 }
 
 static struct msgb *make_mdcx_msg(struct mgcp_ctx *mgcp_ctx)
@@ -148,12 +171,19 @@ static struct msgb *make_mdcx_msg(struct mgcp_ctx *mgcp_ctx)
 		.audio_ip = mgcp_ctx->conn_peer_local.addr,
 		.audio_port = mgcp_ctx->conn_peer_local.port,
 		.ptime = mgcp_ctx->conn_peer_local.ptime,
-		.codecs_len = mgcp_ctx->conn_peer_local.codecs_len,
-		.ptmap_len = mgcp_ctx->conn_peer_local.ptmap_len
+		.ptmap_len = mgcp_ctx->conn_peer_local.ptmap_len,
+		.param_present = mgcp_ctx->conn_peer_local.param_present
 	};
 	osmo_strlcpy(mgcp_msg.endpoint, mgcp_ctx->conn_peer_remote.endpoint, MGCP_ENDPOINT_MAXLEN);
-	memcpy(mgcp_msg.codecs, mgcp_ctx->conn_peer_local.codecs, sizeof(mgcp_msg.codecs));
 	memcpy(mgcp_msg.ptmap, mgcp_ctx->conn_peer_local.ptmap, sizeof(mgcp_msg.ptmap));
+	memcpy(&mgcp_msg.param, &mgcp_ctx->conn_peer_local.param, sizeof(mgcp_ctx->conn_peer_local.param));
+
+	set_conn_mode(&mgcp_msg, &mgcp_ctx->conn_peer_local);
+
+	if (mgcp_ctx->conn_peer_local.x_osmo_osmux_use) {
+		mgcp_msg.x_osmo_osmux_cid = mgcp_ctx->conn_peer_local.x_osmo_osmux_cid;
+		mgcp_msg.presence |= MGCP_MSG_PRESENCE_X_OSMO_OSMUX_CID;
+	}
 
 	/* Note: We take the endpoint and the call_id from the remote
 	 * connection info, because we can be confident that the
@@ -197,8 +227,9 @@ static void fsm_crcx_cb(struct osmo_fsm_inst *fi, uint32_t event, void *data)
 			 mgcp_ctx->conn_peer_local.endpoint);
 
 		make_crcx_msg(&mgcp_msg, &mgcp_ctx->conn_peer_local);
-		if (mgcp_ctx->conn_peer_local.port)
-			add_audio(&mgcp_msg, &mgcp_ctx->conn_peer_local);
+		add_audio(&mgcp_msg, &mgcp_ctx->conn_peer_local);
+		set_conn_mode(&mgcp_msg, &mgcp_ctx->conn_peer_local);
+
 		msg = mgcp_msg_gen(mgcp_ctx->mgcp, &mgcp_msg);
 		OSMO_ASSERT(msg);
 
@@ -226,6 +257,18 @@ const char *mgcp_conn_get_ci(struct osmo_fsm_inst *fi)
 	return mgcp_ctx->conn_id;
 }
 
+/* Get the mgcp_client that is used with this mgcp_client_fsm instance */
+struct mgcp_client *mgcp_conn_get_client(struct osmo_fsm_inst *fi)
+{
+	struct mgcp_ctx *mgcp_ctx;
+
+	if (!fi)
+		return NULL;
+
+	mgcp_ctx = fi->priv;
+	return mgcp_ctx->mgcp;
+}
+
 static void mgw_crcx_resp_cb(struct mgcp_response *r, void *priv)
 {
 	struct osmo_fsm_inst *fi = priv;
@@ -255,6 +298,11 @@ static void mgw_crcx_resp_cb(struct mgcp_response *r, void *priv)
 		return;
 	}
 	LOGPFSML(fi, LOGL_DEBUG, "MGW/CRCX: MGW responded with address %s:%u\n", r->audio_ip, r->audio_port);
+	if (r->head.x_osmo_osmux_use) {
+		LOGPFSML(fi, LOGL_DEBUG, "MGW/CRCX: MGW responded using Osmux %u\n", r->head.x_osmo_osmux_cid);
+		mgcp_ctx->conn_peer_remote.x_osmo_osmux_use = true;
+		mgcp_ctx->conn_peer_remote.x_osmo_osmux_cid = r->head.x_osmo_osmux_cid;
+	}
 
 	osmo_strlcpy(mgcp_ctx->conn_peer_remote.addr, r->audio_ip, sizeof(mgcp_ctx->conn_peer_remote.addr));
 	mgcp_ctx->conn_peer_remote.port = r->audio_port;
@@ -321,13 +369,21 @@ static void fsm_ready_cb(struct osmo_fsm_inst *fi, uint32_t event, void *data)
 	switch (event) {
 	case EV_MDCX:
 		msg = make_mdcx_msg(mgcp_ctx);
-		OSMO_ASSERT(msg);
+		if (!msg) {
+			/* make_mdcx_msg() should already have logged the error */
+			osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL);
+			return;
+		}
 		rc = mgcp_client_tx(mgcp, msg, mgw_mdcx_resp_cb, fi);
 		new_state = ST_MDCX_RESP;
 		break;
 	case EV_DLCX:
 		msg = make_dlcx_msg(mgcp_ctx);
-		OSMO_ASSERT(msg);
+		if (!msg) {
+			/* make_dlcx_msg() should already have logged the error */
+			osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL);
+			return;
+		}
 		rc = mgcp_client_tx(mgcp, msg, mgw_dlcx_resp_cb, fi);
 		new_state = ST_DLCX_RESP;
 		break;
@@ -374,6 +430,12 @@ static void mgw_mdcx_resp_cb(struct mgcp_response *r, void *priv)
 	}
 	LOGPFSML(fi, LOGL_DEBUG, "MGW/MDCX: MGW responded with address %s:%u\n", r->audio_ip, r->audio_port);
 
+	if (r->head.x_osmo_osmux_use) {
+		LOGPFSML(fi, LOGL_DEBUG, "MGW/CRCX: MGW responded using Osmux %u\n", r->head.x_osmo_osmux_cid);
+		mgcp_ctx->conn_peer_remote.x_osmo_osmux_use = true;
+		mgcp_ctx->conn_peer_remote.x_osmo_osmux_cid = r->head.x_osmo_osmux_cid;
+	}
+
 	osmo_strlcpy(mgcp_ctx->conn_peer_remote.addr, r->audio_ip, sizeof(mgcp_ctx->conn_peer_remote.addr));
 	mgcp_ctx->conn_peer_remote.port = r->audio_port;
 
@@ -484,13 +546,17 @@ static void fsm_cleanup_cb(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause ca
 	/* Should the FSM be terminated while there are still open connections
 	 * on the MGW, we send an unconditional DLCX to terminate the
 	 * connection. This is not the normal case. The user should always use
-	 * mgcp_conn_delete() to instruct the FSM to perform a graceful exit */
-	if (strlen(mgcp_ctx->conn_id)) {
-		LOGPFSML(fi, LOGL_ERROR,
-			 "MGW/DLCX: abrupt FSM termination with connections still present, sending unconditional DLCX...\n");
+	 * mgcp_conn_delete() to instruct the FSM to perform a graceful exit.
+	 * If in ST_DLCX_RESP, a DLCX was already sent and we did not get a
+	 * response. No point in sending another one. */
+	if (fi->state != ST_DLCX_RESP && strlen(mgcp_ctx->conn_id)) {
+		LOGPFSML(fi, LOGL_INFO, "Conn cleanup, sending DLCX for %s %s\n", mgcp_ctx->conn_peer_remote.endpoint,
+			 mgcp_ctx->conn_id);
 		msg = make_dlcx_msg(mgcp_ctx);
-		OSMO_ASSERT(msg);
-		mgcp_client_tx(mgcp, msg, NULL, NULL);
+		if (!msg)
+			LOGPFSML(fi, LOGL_ERROR, "MGW/DLCX: Error composing DLCX message\n");
+		else
+			mgcp_client_tx(mgcp, msg, NULL, NULL);
 	}
 
 	talloc_free(mgcp_ctx);
@@ -555,8 +621,75 @@ static struct osmo_fsm fsm_mgcp_client = {
 	.timer_cb = fsm_timeout_cb,
 	.cleanup = fsm_cleanup_cb,
 	.event_names = fsm_mgcp_client_evt_names,
+	.log_subsys = DLMGCP,
 };
 
+/* Provide backwards compat for deprecated conn_peer->codecs[]: when the caller passes in an mgcp_conn_peer instance
+ * that has codecs[] set, apply it to ptmap[] instead. */
+static void mgcp_conn_peer_compat(struct mgcp_conn_peer *conn_peer)
+{
+	struct ptmap ptmap[MGCP_MAX_CODECS];
+	unsigned int ptmap_len;
+
+	if (!conn_peer->codecs_len)
+		return;
+
+	/* Before dropping codecs[], codecs[] would indicate the order in which the codecs should appear in SDP. ptmap[]
+	 * would indicate payload type numbers when not using a default payload type number (may omit entries).
+	 * Now, ptmap[] just indicates both at the same time; codecs[] should be empty, and ptmap[] lists all codecs.
+	 * So if any codecs[] are present, recreate ptmap[] in the order of codecs[]. */
+
+	ptmap_len = 0;
+	for (int i = 0; i < conn_peer->codecs_len; i++) {
+		enum mgcp_codecs codec = conn_peer->codecs[i];
+		struct ptmap *found = NULL;
+
+		/* Look up whether a specific pt was indicated for this codec */
+		for (int p = 0; p < conn_peer->ptmap_len; p++) {
+			if (conn_peer->ptmap[p].codec != codec)
+				continue;
+			found = &conn_peer->ptmap[p];
+			break;
+		}
+		if (found) {
+			ptmap[ptmap_len] = *found;
+		} else {
+			ptmap[ptmap_len] = (struct ptmap){
+				.codec = codec,
+				/* some enum mgcp_codecs correspond to their standard PT nr, so for compat: */
+				.pt = codec,
+			};
+		}
+		ptmap_len++;
+	}
+
+	/* Are there any entries in the old ptmap that were omitted by codecs[]? */
+	for (int p = 0; p < conn_peer->ptmap_len; p++) {
+		bool exists = false;
+		for (int i = 0; i < ptmap_len; i++) {
+			if (ptmap_cmp(&ptmap[i], &conn_peer->ptmap[p]))
+				continue;
+			exists = true;
+			break;
+		}
+
+		if (exists)
+			continue;
+
+		if (ptmap_len >= ARRAY_SIZE(ptmap))
+			break;
+
+		/* Not present yet, add it to the end */
+		ptmap[ptmap_len] = conn_peer->ptmap[p];
+		ptmap_len++;
+	}
+
+	/* Use the new ptmap[], and clear out legacy codecs[]. */
+	memcpy(conn_peer->ptmap, ptmap, sizeof(conn_peer->ptmap));
+	conn_peer->ptmap_len = ptmap_len;
+	conn_peer->codecs_len = 0;
+}
+
 /*! allocate FSM, and create a new connection on the MGW.
  *  \param[in] mgcp MGCP client descriptor.
  *  \param[in] parent_fi Parent FSM instance.
@@ -568,24 +701,20 @@ struct osmo_fsm_inst *mgcp_conn_create(struct mgcp_client *mgcp, struct osmo_fsm
 				       uint32_t parent_term_evt, uint32_t parent_evt, struct mgcp_conn_peer *conn_peer)
 {
 	struct mgcp_ctx *mgcp_ctx;
-	static bool fsm_registered = false;
 	struct osmo_fsm_inst *fi;
-	struct in_addr ip_test;
+	struct in6_addr ip_test;
+
+	mgcp_conn_peer_compat(conn_peer);
 
 	OSMO_ASSERT(parent_fi);
 	OSMO_ASSERT(mgcp);
 	OSMO_ASSERT(conn_peer);
 
 	/* Check if IP/Port information in conn info makes sense */
-	if (conn_peer->port && inet_aton(conn_peer->addr, &ip_test) == 0)
+	if (conn_peer->port && inet_pton(osmo_ip_str_type(conn_peer->addr),
+					 conn_peer->addr, &ip_test) != 1)
 		return NULL;
 
-	/* Register the fsm description (if not already done) */
-	if (fsm_registered == false) {
-		osmo_fsm_register(&fsm_mgcp_client);
-		fsm_registered = true;
-	}
-
 	/* Allocate and configure a new fsm instance */
 	fi = osmo_fsm_inst_alloc_child(&fsm_mgcp_client, parent_fi, parent_term_evt);
 	OSMO_ASSERT(fi);
@@ -613,7 +742,9 @@ int mgcp_conn_modify(struct osmo_fsm_inst *fi, uint32_t parent_evt, struct mgcp_
 {
 	OSMO_ASSERT(fi);
 	struct mgcp_ctx *mgcp_ctx = fi->priv;
-	struct in_addr ip_test;
+	struct in6_addr ip_test;
+
+	mgcp_conn_peer_compat(conn_peer);
 
 	OSMO_ASSERT(mgcp_ctx);
 	OSMO_ASSERT(conn_peer);
@@ -637,8 +768,8 @@ int mgcp_conn_modify(struct osmo_fsm_inst *fi, uint32_t parent_evt, struct mgcp_
 		LOGPFSML(fi, LOGL_ERROR, "Cannot MDCX, port == 0\n");
 		return -EINVAL;
 	}
-	if (inet_aton(conn_peer->addr, &ip_test) == 0) {
-		LOGPFSML(fi, LOGL_ERROR, "Cannot MDCX, IP address == 0.0.0.0\n");
+	if (inet_pton(osmo_ip_str_type(conn_peer->addr), conn_peer->addr, &ip_test) != 1) {
+		LOGPFSML(fi, LOGL_ERROR, "Cannot MDCX, IP address %s\n", conn_peer->addr);
 		return -EINVAL;
 	}
 
@@ -670,8 +801,11 @@ void mgcp_conn_delete(struct osmo_fsm_inst *fi)
 
 	OSMO_ASSERT(mgcp_ctx);
 
-	/* Unlink FSM from parent */
-	osmo_fsm_inst_unlink_parent(fi, NULL);
+	if (fi->proc.terminating)
+		return;
+
+	/* Unlink FSM from parent, set the struct mgcp_client as new talloc ctx. */
+	osmo_fsm_inst_unlink_parent(fi, mgcp_ctx->mgcp);
 
 	/* An error situation where the parent FSM must be killed immediately
 	 * may lead into a situation where the DLCX can not be executed right
@@ -685,3 +819,30 @@ void mgcp_conn_delete(struct osmo_fsm_inst *fi)
 	}
 	osmo_fsm_inst_dispatch(fi, EV_DLCX, mgcp_ctx);
 }
+
+const char *osmo_mgcpc_conn_peer_name(const struct mgcp_conn_peer *info)
+{
+	/* I'd be fine with a smaller buffer and accept truncation, but gcc possibly refuses to build if
+	 * this buffer is too small. */
+	static char buf[1024];
+
+	if (!info)
+		return "NULL";
+
+	if (info->endpoint[0]
+	    && info->addr[0])
+		snprintf(buf, sizeof(buf), "%s:%s:%u",
+			 info->endpoint, info->addr, info->port);
+	else if (info->endpoint[0])
+		snprintf(buf, sizeof(buf), "%s", info->endpoint);
+	else if (info->addr[0])
+		snprintf(buf, sizeof(buf), "%s:%u", info->addr, info->port);
+	else
+		return "empty";
+	return buf;
+}
+
+static __attribute__((constructor)) void osmo_mgcp_client_fsm_init(void)
+{
+	OSMO_ASSERT(osmo_fsm_register(&fsm_mgcp_client) == 0);
+}

src/libosmo-mgcp-client/mgcp_client_pool.c

@@ -0,0 +1,298 @@
+/* (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Philipp Maier
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <asm-generic/errno.h>
+#include <osmocom/mgcp_client/mgcp_client.h>
+#include <osmocom/mgcp_client/mgcp_client_internal.h>
+#include <osmocom/mgcp_client/mgcp_client_pool_internal.h>
+#include <osmocom/mgcp_client/mgcp_client_pool.h>
+#include <stddef.h>
+
+#define LOGPPMGW(pool_member, level, fmt, args...) \
+LOGP(DLMGCP, level, "MGW-pool(%s) " fmt, mgcp_client_pool_member_name(pool_member), ## args)
+
+/*! Allocate MGCP client pool. This is called once on startup and before the pool is used with
+ *  mgcp_client_pool_vty_init(). Since the pool is linked with the VTY it must exist througout the entire runtime.
+ *  \param[in] talloc_ctx talloc context. */
+struct mgcp_client_pool *mgcp_client_pool_alloc(void *talloc_ctx)
+{
+	struct mgcp_client_pool *pool;
+
+	pool = talloc_zero(talloc_ctx, struct mgcp_client_pool);
+	if (!pool)
+		return NULL;
+
+	INIT_LLIST_HEAD(&pool->member_list);
+
+	return pool;
+}
+
+/*! Initialize and connect an mcgp client pool.
+ *  \param[in,out] mgcp MGCP client pool descriptor.
+ *  \returns number of successfully initialized pool members. */
+unsigned int mgcp_client_pool_connect(struct mgcp_client_pool *pool)
+{
+	struct mgcp_client_pool_member *pool_member;
+	unsigned int pool_members_initialized = 0;
+
+	llist_for_each_entry(pool_member, &pool->member_list, list) {
+
+		/* Initialize client */
+		if (mgcp_client_pool_member_reinit_client(pool_member) == 0)
+			pool_members_initialized++;
+	}
+
+	return pool_members_initialized;
+}
+
+/*! register a single mgcp_client instance to the pool.
+ *  \param[out] pool MGCP client pool descriptor.
+ *  \param[in] mgcp MGCP client descriptor. */
+void mgcp_client_pool_register_single(struct mgcp_client_pool *pool, struct mgcp_client *mgcp_client)
+{
+	/*! Some applications still support the non-pooled MGW VTY configuration variant provided by
+	 *  mgcp_client_vty_init(). If this is the case the mgcp_client instance created by mgcp_client_init()
+	 *  can be registered here so that it will appear as if it were part of the pool. When the user actively
+	 *  configures MGW pool members, the MGCP client registered here will be ignored. (The registration of
+	 *  multiple singe mgcp_client instances is not possible.) */
+	pool->mgcp_client_single = mgcp_client;
+}
+
+bool mgcp_client_pool_empty(const struct mgcp_client_pool *pool)
+{
+	return llist_empty(&pool->member_list);
+}
+
+/*! Lookup the selected MGCP client config by its reference number */
+struct mgcp_client_pool_member *mgcp_client_pool_find_member_by_nr(struct mgcp_client_pool *pool, unsigned int nr)
+{
+	struct mgcp_client_pool_member *pool_member;
+
+	llist_for_each_entry(pool_member, &pool->member_list, list) {
+		if (pool_member->nr == nr)
+			return pool_member;
+	}
+
+	return NULL;
+}
+
+/* Not every pool member may have a functional MGCP client, we will run through the pool once until we meet a
+ * pool member that is suitable (is not blocked, has a client with a working link, has a low load). */
+static struct mgcp_client_pool_member *mgcp_client_pool_pick(struct mgcp_client_pool *pool)
+{
+	struct mgcp_client_pool_member *pool_member;
+	struct mgcp_client_pool_member *pool_member_picked = NULL;
+	unsigned int n_pool_members = 0;
+
+	llist_for_each_entry(pool_member, &pool->member_list, list) {
+		n_pool_members++;
+		bool conn_up = pool_member->client && pool_member->client->conn_up;
+		if (pool_member->blocked == false && conn_up) {
+			if (!pool_member_picked)
+				pool_member_picked = pool_member;
+			else if (pool_member_picked->refcount > pool_member->refcount)
+				pool_member_picked = pool_member;
+		} else {
+			LOGPPMGW(pool_member, LOGL_DEBUG, "%s -- MGW %u is unusable (blocked=%u, cli=%u, link=%u)\n",
+				 __func__, pool_member->nr, pool_member->blocked, !!pool_member->client, conn_up);
+		}
+	}
+
+	if (pool_member_picked) {
+		LOGPPMGW(pool_member_picked, LOGL_DEBUG, "MGW pool has %u members -- using MGW %u (active calls: %u)\n",
+			 n_pool_members, pool_member_picked->nr, pool_member_picked->refcount);
+		return pool_member_picked;
+	}
+
+	LOGP(DLMGCP, LOGL_ERROR,
+	     "MGW pool has %u members, but no functional MGW pool member found -- check configuration!\n",
+	     n_pool_members);
+
+	return NULL;
+}
+
+/*! get an MGCP client from the pool (increment reference counter).
+ *  \param[in,out] pool MGCP client pool descriptor.
+ *  \returns MGCP client descriptor, NULL if no member was found (empty pool). */
+struct mgcp_client *mgcp_client_pool_get(struct mgcp_client_pool *pool)
+{
+	struct mgcp_client_pool_member *pool_member;
+
+	/*! When an MGCP client is taken from the pool it is still available for other calls. In fact only a reference
+	 *  counter is incremented to keep track on how many references to a specific MGCP client are currently used
+	 *  by the application code. */
+
+	/* When the pool is empty, return a single MGCP client if it is registered. */
+	if (llist_empty(&pool->member_list) && pool->mgcp_client_single) {
+		LOGP(DLMGCP, LOGL_DEBUG, "MGW pool is empty -- using (single) MGW %s\n",
+		     mgcp_client_name(pool->mgcp_client_single));
+		return pool->mgcp_client_single;
+	}
+
+	/* Abort when the pool is empty */
+	if (llist_empty(&pool->member_list)) {
+		LOGP(DLMGCP, LOGL_ERROR, "MGW pool is empty -- no MGW available!\n");
+		return NULL;
+	}
+
+	/* Pick a suitable pool member */
+	pool_member = mgcp_client_pool_pick(pool);
+	if (!pool_member)
+		return NULL;
+
+	return mgcp_client_pool_member_get(pool_member);
+}
+
+/*! put an MGCP client back into the pool (decrement reference counter).
+ *  \param[in,out] pool MGCP client pool descriptor.
+ *  \param[in] mgcp MGCP client descriptor.
+ *
+ * This function is able to detect automatically to which pool the mgcp_client belongs. If the mgcp_client does
+ * not belong to a pool at all, the function call will have no effect. */
+void mgcp_client_pool_put(struct mgcp_client *mgcp_client)
+{
+	struct mgcp_client_pool_member *pool_member;
+
+	if (!mgcp_client)
+		return;
+
+	if (!mgcp_client->pool_member)
+		return;
+	pool_member = mgcp_client->pool_member;
+
+	if (pool_member->refcount == 0) {
+		LOGPPMGW(pool_member, LOGL_ERROR, "MGW pool member has invalid refcount\n");
+		return;
+	}
+	pool_member->refcount--;
+}
+
+/***************************
+ * mgcp_client_pool_member:
+ ***************************/
+
+/*! Allocate an mgcp_client_pool_member.
+ *  \param[in] pool MGCP client pool descriptor.
+ *  \param[in] nr Reference number of the pool member.
+ */
+struct mgcp_client_pool_member *mgcp_client_pool_member_alloc(struct mgcp_client_pool *pool, unsigned int nr)
+{
+	struct mgcp_client_pool_member *pool_member;
+
+	pool_member = talloc_zero(pool, struct mgcp_client_pool_member);
+	OSMO_ASSERT(pool_member);
+	mgcp_client_conf_init(&pool_member->conf);
+	pool_member->pool = pool;
+	pool_member->nr = nr;
+	llist_add_tail(&pool_member->list, &pool->member_list);
+	return pool_member;
+}
+
+/*! Free an mgcp_client_pool_member allocated through mgcp_client_pool_member_alloc().
+ *  \param[in] pool_member MGCP client pool descriptor.
+ *
+ * It also frees the associated MGCP client if present.
+ */
+void mgcp_client_pool_member_free(struct mgcp_client_pool_member *pool_member)
+{
+	llist_del(&pool_member->list);
+	if (pool_member->client) {
+		mgcp_client_disconnect(pool_member->client);
+		talloc_free(pool_member->client);
+	}
+	talloc_free(pool_member);
+}
+
+/*! Recreate and reconnect the MGCP client associated to the pool descriptor.
+ *  \param[in] pool_member MGCP client pool descriptor.
+ */
+int mgcp_client_pool_member_reinit_client(struct mgcp_client_pool_member *pool_member)
+{
+	/* Get rid of a possibly existing old MGCP client instance first */
+	if (pool_member->client) {
+		mgcp_client_disconnect(pool_member->client);
+		talloc_free(pool_member->client);
+	}
+
+	/* Initialize client */
+	pool_member->client = mgcp_client_init(pool_member, &pool_member->conf);
+	if (!pool_member->client) {
+		LOGPPMGW(pool_member, LOGL_ERROR, "MGCP client initialization failed\n");
+		return -EINVAL;
+	}
+
+	/* Set backpointer so that we can detect later that this MGCP client is managed by this pool. */
+	pool_member->client->pool_member = pool_member;
+
+	/* Connect client */
+	if (mgcp_client_connect(pool_member->client)) {
+		LOGPPMGW(pool_member, LOGL_ERROR, "MGCP client connect failed at (%s:%u)\n",
+				pool_member->conf.remote_addr, pool_member->conf.remote_port);
+		talloc_free(pool_member->client);
+		pool_member->client = NULL;
+		return -ECONNABORTED;
+	}
+	return 0;
+}
+
+/* Get a human readable name for a given pool member. */
+const char *mgcp_client_pool_member_name(const struct mgcp_client_pool_member *pool_member)
+{
+	const struct mgcp_client *mpcp_client;
+	struct mgcp_client mpcp_client_dummy;
+	static char name[512];
+	const char *description;
+
+	if (!pool_member)
+		return "(null)";
+
+	/* It is not guranteed that a pool_member has an MGCP client. The client may not yet be initialized or the
+	 * initalization may have been failed. In this case we will generate a dummy MGCP client to work with. */
+	if (!pool_member->client) {
+		memcpy(&mpcp_client_dummy.actual, &pool_member->conf, sizeof(mpcp_client_dummy.actual));
+		mpcp_client = &mpcp_client_dummy;
+	} else {
+		mpcp_client = pool_member->client;
+	}
+
+	description = mgcp_client_name(mpcp_client);
+	snprintf(name, sizeof(name), "%d:%s", pool_member->nr, description);
+
+	return name;
+}
+
+/*! Get the MGCP client associated with the pool reference from the pool (increment reference counter).
+ *  \param[in] pool_member MGCP client pool descriptor.
+ *  \returns MGCP client descriptor, NULL if no member was not ready.
+ */
+struct mgcp_client *mgcp_client_pool_member_get(struct mgcp_client_pool_member *pool_member)
+{
+	pool_member->refcount++;
+	return pool_member->client;
+}
+
+/*! Get whether the MGCP client associated with the pool reference is blocked by policy.
+ *  \param[in] pool_member MGCP client pool descriptor.
+ *  \returns true if blocked, false otherwise
+ */
+bool mgcp_client_pool_member_is_blocked(const struct mgcp_client_pool_member *pool_member)
+{
+	return pool_member->blocked;
+}

src/libosmo-mgcp-client/mgcp_client_vty.c

@@ -1,5 +1,5 @@
 /* MGCP client interface to quagga VTY */
-/* (C) 2016 by sysmocom s.m.f.c. GmbH <info@sysmocom.de>
+/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
  * Based on OpenBSC interface to quagga VTY (libmsc/vty_interface_layer3.c)
  * (C) 2009 by Harald Welte <laforge@gnumonks.org>
  * (C) 2009-2011 by Holger Hans Peter Freyther
@@ -24,27 +24,78 @@
 #include <stdlib.h>
 #include <talloc.h>
 
+#include <osmocom/vty/vty.h>
 #include <osmocom/vty/command.h>
 #include <osmocom/vty/misc.h>
 #include <osmocom/core/utils.h>
+#include <osmocom/core/timer.h>
 
 #include <osmocom/mgcp_client/mgcp_client.h>
+#include <osmocom/mgcp_client/mgcp_client_internal.h>
+#include <osmocom/mgcp_client/mgcp_client_pool_internal.h>
+#include <osmocom/mgcp_client/mgcp_client_pool.h>
 
 #define MGW_STR MGCP_CLIENT_MGW_STR
 
-void *global_mgcp_client_ctx = NULL;
-struct mgcp_client_conf *global_mgcp_client_conf = NULL;
+/* Only common (non-pooled) VTY commands will use this talloc context. All
+ * pooled VTY commands will use the pool (global_mgcp_client_pool) as
+ * talloc context. */
+static void *global_mgcp_client_ctx = NULL;
+
+/* MGCP Client configuration used with mgcp_client_vty_init(). (This pointer
+ * points to user provided memory, so it cannot be used as talloc context.) */
+static struct mgcp_client_conf *global_mgcp_client_conf = NULL;
+
+/* Pointer to the MGCP pool that is managed by mgcp_client_pool_vty_init() */
+static struct mgcp_client_pool *global_mgcp_client_pool = NULL;
+
+static struct mgcp_client_conf *get_mgcp_client_config(struct vty *vty)
+{
+	if (global_mgcp_client_pool && vty->node == global_mgcp_client_pool->vty_node->node)
+		return vty->index;
+
+	/* Global single MGCP config, deprecated: */
+	vty_out(vty, "%% MGCP commands outside of 'mgw' nodes are deprecated. "
+		"You should consider reading the User Manual and migrating to 'mgw' node.%s",
+		VTY_NEWLINE);
+
+	return global_mgcp_client_conf;
+}
+
+static struct mgcp_client *get_mgcp_client(struct vty *vty)
+{
+	struct mgcp_client_conf *conf = get_mgcp_client_config(vty);
+	struct mgcp_client_pool_member *pool_member;
+
+	if (global_mgcp_client_pool && vty->node == global_mgcp_client_pool->vty_node->node) {
+		llist_for_each_entry(pool_member, &global_mgcp_client_pool->member_list, list) {
+			/* Find matching the conf pointer: */
+			if (&pool_member->conf != conf)
+				continue;
+			return pool_member->client;
+		}
+	}
+
+	/* Global single MGCP config, deprecated: */
+	vty_out(vty, "%% MGCP commands outside of 'mgw' nodes are deprecated. "
+		"You should consider reading the User Manual and migrating to 'mgw' node.%s",
+		VTY_NEWLINE);
+
+	/* There's no way to obtain the struct mgcp_client in old interface, but anyway it's deprecated. */
+	return NULL;
+}
+
 
 DEFUN(cfg_mgw_local_ip, cfg_mgw_local_ip_cmd,
-      "mgw local-ip A.B.C.D",
-      MGW_STR "local bind to connect to MGW from\n"
-      "local bind IP address\n")
+      "local-ip " VTY_IPV46_CMD,
+      "local bind to connect to MGW from\n"
+      "local bind IPv4 address\n"
+      "local bind IPv6 address\n")
 {
-	if (!global_mgcp_client_conf)
-		return CMD_ERR_NOTHING_TODO;
-	OSMO_ASSERT(global_mgcp_client_ctx);
+	struct mgcp_client_conf *conf = get_mgcp_client_config(vty);
+
 	osmo_talloc_replace_string(global_mgcp_client_ctx,
-				   (char**)&global_mgcp_client_conf->local_addr,
+				   (char **)&conf->local_addr,
 				   argv[0]);
 	return CMD_SUCCESS;
 }
@@ -52,56 +103,77 @@ ALIAS_DEPRECATED(cfg_mgw_local_ip, cfg_mgcpgw_local_ip_cmd,
 		 "mgcpgw local-ip A.B.C.D",
 		 MGW_STR "local bind to connect to MGCP gateway with\n"
 		 "local bind IP address\n")
+ALIAS_DEPRECATED(cfg_mgw_local_ip,
+		 cfg_mgw_mgw_local_ip_cmd,
+		 "mgw local-ip " VTY_IPV46_CMD,
+		 MGW_STR "local bind to connect to MGW from\n"
+		 "local bind IPv4 address\n"
+		 "local bind IPv6 address\n")
 
 DEFUN(cfg_mgw_local_port, cfg_mgw_local_port_cmd,
-      "mgw local-port <0-65535>",
-      MGW_STR "local port to connect to MGW from\n"
+      "local-port <0-65535>",
+      "local port to connect to MGW from\n"
       "local bind port\n")
 {
-	if (!global_mgcp_client_conf)
-		return CMD_ERR_NOTHING_TODO;
-	global_mgcp_client_conf->local_port = atoi(argv[0]);
+	struct mgcp_client_conf *conf = get_mgcp_client_config(vty);
+
+	conf->local_port = atoi(argv[0]);
 	return CMD_SUCCESS;
 }
 ALIAS_DEPRECATED(cfg_mgw_local_port, cfg_mgcpgw_local_port_cmd,
 		 "mgcpgw local-port <0-65535>",
 		 MGW_STR "local bind to connect to MGCP gateway with\n"
 		 "local bind port\n")
+ALIAS_DEPRECATED(cfg_mgw_local_port,
+		 cfg_mgw_mgw_local_port_cmd,
+		 "mgw local-port <0-65535>",
+		 MGW_STR "local port to connect to MGW from\n"
+		 "local bind port\n")
 
 DEFUN(cfg_mgw_remote_ip, cfg_mgw_remote_ip_cmd,
-      "mgw remote-ip A.B.C.D",
-      MGW_STR "remote IP address to reach the MGW at\n"
-      "remote IP address\n")
+      "remote-ip " VTY_IPV46_CMD,
+      "remote IP address to reach the MGW at\n"
+      "remote IPv4 address\n"
+      "remote IPv6 address\n")
 {
-	if (!global_mgcp_client_conf)
-		return CMD_ERR_NOTHING_TODO;
-	OSMO_ASSERT(global_mgcp_client_ctx);
+	struct mgcp_client_conf *conf = get_mgcp_client_config(vty);
+
 	osmo_talloc_replace_string(global_mgcp_client_ctx,
-				   (char**)&global_mgcp_client_conf->remote_addr,
-				   argv[0]);
+				   (char **)&conf->remote_addr, argv[0]);
 	return CMD_SUCCESS;
 }
 ALIAS_DEPRECATED(cfg_mgw_remote_ip, cfg_mgcpgw_remote_ip_cmd,
 		 "mgcpgw remote-ip A.B.C.D",
 		 MGW_STR "remote bind to connect to MGCP gateway with\n"
 		 "remote bind IP address\n")
+ALIAS_DEPRECATED(cfg_mgw_remote_ip,
+		 cfg_mgw_mgw_remote_ip_cmd,
+		 "mgw remote-ip " VTY_IPV46_CMD,
+		 MGW_STR "remote IP address to reach the MGW at\n"
+		 "remote IPv4 address\n"
+		 "remote IPv6 address\n")
 
 DEFUN(cfg_mgw_remote_port, cfg_mgw_remote_port_cmd,
-      "mgw remote-port <0-65535>",
-      MGW_STR "remote port to reach the MGW at\n"
+      "remote-port <0-65535>",
+      "remote port to reach the MGW at\n"
       "remote port\n")
 {
-	if (!global_mgcp_client_conf)
-		return CMD_ERR_NOTHING_TODO;
-	global_mgcp_client_conf->remote_port = atoi(argv[0]);
+	struct mgcp_client_conf *conf = get_mgcp_client_config(vty);
+
+	conf->remote_port = atoi(argv[0]);
 	return CMD_SUCCESS;
 }
 ALIAS_DEPRECATED(cfg_mgw_remote_port, cfg_mgcpgw_remote_port_cmd,
 		 "mgcpgw remote-port <0-65535>",
 		 MGW_STR "remote bind to connect to MGCP gateway with\n"
 		 "remote bind port\n")
+ALIAS_DEPRECATED(cfg_mgw_remote_port,
+		 cfg_mgw_mgw_remote_port_cmd,
+		 "mgw remote-port <0-65535>",
+		 MGW_STR "remote port to reach the MGW at\n"
+		 "remote port\n")
 
-DEFUN_DEPRECATED(cfg_mgw_endpoint_range, cfg_mgw_endpoint_range_cmd,
+DEFUN_DEPRECATED(cfg_mgw_mgw_endpoint_range, cfg_mgw_mgw_endpoint_range_cmd,
       "mgw endpoint-range <1-65534> <1-65534>",
       MGW_STR "DEPRECATED: the endpoint range cannot be defined by the client\n"
       "-\n" "-\n")
@@ -111,7 +183,7 @@ DEFUN_DEPRECATED(cfg_mgw_endpoint_range, cfg_mgw_endpoint_range_cmd,
 		VTY_NEWLINE);
 	return CMD_SUCCESS;
 }
-ALIAS_DEPRECATED(cfg_mgw_endpoint_range, cfg_mgcpgw_endpoint_range_cmd,
+ALIAS_DEPRECATED(cfg_mgw_mgw_endpoint_range, cfg_mgcpgw_endpoint_range_cmd,
       "mgcpgw endpoint-range <1-65534> <1-65534>",
       MGW_STR "usable range of endpoint identifiers\n"
       "set first useable endpoint identifier\n"
@@ -139,70 +211,535 @@ ALIAS_DEPRECATED(cfg_mgw_rtp_bts_base_port,
 
 DEFUN(cfg_mgw_endpoint_domain_name,
       cfg_mgw_endpoint_domain_name_cmd,
-      "mgw endpoint-domain NAME",
-      MGW_STR "Set the domain name to send in MGCP messages, e.g. the part 'foo' in 'rtpbridge/*@foo'.\n"
+      "endpoint-domain NAME",
+      "Set the domain name to send in MGCP messages, e.g. the part 'foo' in 'rtpbridge/*@foo'.\n"
       "Domain name, should be alphanumeric.\n")
 {
-	if (osmo_strlcpy(global_mgcp_client_conf->endpoint_domain_name, argv[0],
-			 sizeof(global_mgcp_client_conf->endpoint_domain_name))
-	    >= sizeof(global_mgcp_client_conf->endpoint_domain_name)) {
+	struct mgcp_client_conf *conf = get_mgcp_client_config(vty);
+
+	if (osmo_strlcpy(conf->endpoint_domain_name, argv[0], sizeof(conf->endpoint_domain_name))
+	    >= sizeof(conf->endpoint_domain_name)) {
 		vty_out(vty, "%% Error: 'mgw endpoint-domain' name too long, max length is %zu: '%s'%s",
-			sizeof(global_mgcp_client_conf->endpoint_domain_name) - 1, argv[0], VTY_NEWLINE);
+			sizeof(conf->endpoint_domain_name) - 1, argv[0], VTY_NEWLINE);
 		return CMD_WARNING;
 	}
 	return CMD_SUCCESS;
 }
+ALIAS_DEPRECATED(cfg_mgw_endpoint_domain_name,
+      cfg_mgw_mgw_endpoint_domain_name_cmd,
+      "mgw endpoint-domain NAME",
+      MGW_STR "Set the domain name to send in MGCP messages, e.g. the part 'foo' in 'rtpbridge/*@foo'.\n"
+      "Domain name, should be alphanumeric.\n")
 
-int mgcp_client_config_write(struct vty *vty, const char *indent)
+DEFUN(cfg_mgw_reset_ep_name,
+      cfg_mgw_reset_ep_name_cmd,
+      "reset-endpoint NAME",
+      "Add an endpoint name that should be reset (DLCX) on connect to the reset-endpoint list,"
+      "e.g. 'rtpbridge/*'\n"
+      "Endpoint name, e.g. 'rtpbridge/*' or 'ds/e1-0/s-3/su16-4'.\n")
 {
-	const char *addr;
-	int port;
+	int rc;
+	struct reset_ep *reset_ep;
+	struct mgcp_client_conf *conf = get_mgcp_client_config(vty);
 
-	addr = global_mgcp_client_conf->local_addr;
-	if (addr)
-		vty_out(vty, "%smgw local-ip %s%s", indent, addr,
-			VTY_NEWLINE);
-	port = global_mgcp_client_conf->local_port;
-	if (port >= 0)
-		vty_out(vty, "%smgw local-port %u%s", indent,
-			(uint16_t)port, VTY_NEWLINE);
+	/* stop when the address is already in the list */
+	llist_for_each_entry(reset_ep, &conf->reset_epnames, list) {
+		if (strcmp(argv[0], reset_ep->name) == 0) {
+			vty_out(vty, "%% duplicate endpoint name configured ('%s')%s", argv[0], VTY_NEWLINE);
+			return CMD_WARNING;
+		}
+	}
 
-	addr = global_mgcp_client_conf->remote_addr;
-	if (addr)
-		vty_out(vty, "%smgw remote-ip %s%s", indent, addr,
-			VTY_NEWLINE);
-	port = global_mgcp_client_conf->remote_port;
-	if (port >= 0)
-		vty_out(vty, "%smgw remote-port %u%s", indent,
-			(uint16_t)port, VTY_NEWLINE);
+	/* the domain name is not part of the actual endpoint name */
+	if (strchr(argv[0], '@')) {
+		vty_out(vty, "%% the endpoint name must be given without domain name ('%s')%s",
+			argv[0], VTY_NEWLINE);
+		return CMD_WARNING;
+	}
 
-	if (global_mgcp_client_conf->endpoint_domain_name[0])
-		vty_out(vty, "%smgw endpoint-domain %s%s", indent,
-			global_mgcp_client_conf->endpoint_domain_name, VTY_NEWLINE);
+	reset_ep = talloc_zero(global_mgcp_client_ctx, struct reset_ep);
+	OSMO_ASSERT(reset_ep);
+
+	rc = osmo_strlcpy(reset_ep->name, argv[0], sizeof(reset_ep->name));
+	if (rc >= sizeof(reset_ep->name)) {
+		vty_out(vty, "%% Error: 'mgw reset-endpoint' name too long, max length is %zu: '%s'%s",
+			sizeof(reset_ep->name) - 1, argv[0], VTY_NEWLINE);
+		talloc_free(reset_ep);
+		return CMD_WARNING;
+	}
+
+	llist_add_tail(&reset_ep->list, &conf->reset_epnames);
+
+	return CMD_SUCCESS;
+}
+ALIAS_DEPRECATED(cfg_mgw_reset_ep_name,
+      cfg_mgw_mgw_reset_ep_name_cmd,
+      "mgw reset-endpoint NAME",
+      MGW_STR "Add an endpoint name that should be reset (DLCX) on connect to the reset-endpoint list,"
+      "e.g. 'rtpbridge/*'\n"
+      "Endpoint name, e.g. 'rtpbridge/*' or 'ds/e1-0/s-3/su16-4'.\n")
+
+DEFUN(cfg_mgw_no_reset_ep_name,
+      cfg_mgw_no_reset_ep_name_cmd,
+      "no reset-endpoint NAME",
+      NO_STR "remove an endpoint name from the reset-endpoint list, e.g. 'rtpbridge/*'\n"
+      "Endpoint name, e.g. 'rtpbridge/*' or 'ds/e1-0/s-3/su16-4'.\n")
+{
+	struct reset_ep *reset_ep;
+	struct mgcp_client_conf *conf = get_mgcp_client_config(vty);
+
+	llist_for_each_entry(reset_ep, &conf->reset_epnames, list) {
+		if (strcmp(argv[0], reset_ep->name) == 0) {
+			llist_del(&reset_ep->list);
+			talloc_free(reset_ep);
+			return CMD_SUCCESS;
+		}
+	}
+
+	vty_out(vty, "%% no such endpoint name configured ('%s')%s", argv[0], VTY_NEWLINE);
+	return CMD_WARNING;
+}
+ALIAS_DEPRECATED(cfg_mgw_no_reset_ep_name,
+      cfg_mgw_mgw_no_reset_ep_name_cmd,
+      "no mgw reset-endpoint NAME",
+      NO_STR MGW_STR "remove an endpoint name from the reset-endpoint list, e.g. 'rtpbridge/*'\n"
+      "Endpoint name, e.g. 'rtpbridge/*' or 'ds/e1-0/s-3/su16-4'.\n")
+
+DEFUN(cfg_mgw_mgw_keepalive_req_interval,
+      cfg_mgw_mgw_keepalive_req_interval_cmd,
+      "keepalive request-interval <0-4294967295>",
+      "Monitor if the MGCP link against MGW is still usable\n"
+      "Send an MGCP command to the MGW at given interval if no other commands are sent\n"
+      "The interval at which send MGCP commands (s), 0 to disable\n")
+{
+	struct mgcp_client_conf *conf = get_mgcp_client_config(vty);
+	struct mgcp_client *mgcp = get_mgcp_client(vty);
+
+	conf->keepalive.req_interval_sec = atoi(argv[0]);
+
+	if (!mgcp)
+		return CMD_SUCCESS;
+
+	/* If client already exists, apply the change immediately if possible: */
+	mgcp->actual.keepalive.req_interval_sec = atoi(argv[0]);
+	if (mgcp->wq.bfd.fd != -1) { /* UDP MGCP socket connected */
+		if (mgcp->actual.keepalive.req_interval_sec > 0) {
+			/* Re-schedule: */
+			osmo_timer_schedule(&mgcp->keepalive_tx_timer, mgcp->actual.keepalive.req_interval_sec, 0);
+		} else {
+			if (osmo_timer_pending(&mgcp->keepalive_tx_timer))
+				osmo_timer_del(&mgcp->keepalive_tx_timer);
+			/* Assume link is UP by default, so that this MGW can be selected: */
+			mgcp->conn_up = true;
+		}
+	} /* else: wait until connect() to do first scheduling */
 
 	return CMD_SUCCESS;
 }
 
-void mgcp_client_vty_init(void *talloc_ctx, int node, struct mgcp_client_conf *conf)
+DEFUN(cfg_mgw_mgw_keepalive_req_endpoint,
+      cfg_mgw_mgw_keepalive_req_endpoint_cmd,
+      "keepalive request-endpoint NAME",
+      "Monitor if the MGCP link against MGW is still usable\n"
+      "Use a given endpoint name when sending an MGCP command to the MGW for keepalive purposes\n"
+      "The name of the endpoint to use\n")
+{
+	struct mgcp_client_conf *conf = get_mgcp_client_config(vty);
+	struct mgcp_client *mgcp = get_mgcp_client(vty);
+
+	OSMO_STRLCPY_ARRAY(conf->keepalive.req_endpoint_name, argv[0]);
+
+	if (!mgcp)
+		return CMD_SUCCESS;
+
+	/* If client already exists, apply the change immediately if possible: */
+	OSMO_STRLCPY_ARRAY(mgcp->actual.keepalive.req_endpoint_name, argv[0]);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_mgw_mgw_keepalive_timeout,
+      cfg_mgw_mgw_keepalive_timeout_cmd,
+      "keepalive timeout <0-4294967295>",
+      "Monitor if the MGCP link against MGW is still usable\n"
+      "Consider the link to the MGW to be down after time without receiving any message from it\n"
+      "The timeout (s), 0 to disable\n")
+{
+	struct mgcp_client_conf *conf = get_mgcp_client_config(vty);
+	struct mgcp_client *mgcp = get_mgcp_client(vty);
+
+	conf->keepalive.timeout_sec = atoi(argv[0]);
+
+	if (!mgcp)
+		return CMD_SUCCESS;
+
+	/* If client already exists, apply the change immediately if possible: */
+	mgcp->actual.keepalive.timeout_sec = atoi(argv[0]);
+	if (mgcp->wq.bfd.fd != -1) { /* UDP MGCP socket connected */
+		if (mgcp->actual.keepalive.timeout_sec > 0) {
+			/* Re-schedule: */
+			osmo_timer_schedule(&mgcp->keepalive_rx_timer, mgcp->actual.keepalive.timeout_sec, 0);
+		} else {
+			if (osmo_timer_pending(&mgcp->keepalive_rx_timer))
+				osmo_timer_del(&mgcp->keepalive_rx_timer);
+			/* Assume link is UP by default, so that this MGW can be selected: */
+			mgcp->conn_up = true;
+		}
+	} /* else: wait until connect() to do first scheduling */
+
+	return CMD_SUCCESS;
+}
+
+static int config_write(struct vty *vty, const char *indent, struct mgcp_client_conf *conf)
+{
+	const char *addr;
+	int port;
+	struct reset_ep *reset_ep;
+
+	/* If caller doesn't the MGW pool API (mgcp_client_pool_vty_init was never called),
+	 * then the "mgw" cmd prefix must be added since the old node always contained it.
+	 */
+	const char *mgw_prefix = global_mgcp_client_pool ? "" : "mgw ";
+
+	if (conf->description) /* description never had "mgw" prefix even on old node: */
+		vty_out(vty, "%sdescription %s%s", indent, conf->description, VTY_NEWLINE);
+
+	addr = conf->local_addr;
+	if (addr)
+		vty_out(vty, "%s%slocal-ip %s%s", indent, mgw_prefix, addr, VTY_NEWLINE);
+	port = conf->local_port;
+	if (port >= 0)
+		vty_out(vty, "%s%slocal-port %u%s", indent, mgw_prefix,
+			(uint16_t)port, VTY_NEWLINE);
+
+	addr = conf->remote_addr;
+	if (addr)
+		vty_out(vty, "%s%sremote-ip %s%s", indent, mgw_prefix, addr, VTY_NEWLINE);
+	port = conf->remote_port;
+	if (port >= 0)
+		vty_out(vty, "%s%sremote-port %u%s", indent, mgw_prefix,
+			(uint16_t)port, VTY_NEWLINE);
+
+	if (conf->endpoint_domain_name[0])
+		vty_out(vty, "%s%sendpoint-domain %s%s", indent, mgw_prefix,
+			conf->endpoint_domain_name, VTY_NEWLINE);
+
+	llist_for_each_entry(reset_ep, &conf->reset_epnames, list)
+		vty_out(vty, "%s%sreset-endpoint %s%s", indent, mgw_prefix, reset_ep->name, VTY_NEWLINE);
+
+	if (conf->keepalive.req_interval_sec != 0)
+		vty_out(vty, "%s%skeepalive request-interval %u%s", indent, mgw_prefix,
+			conf->keepalive.req_interval_sec, VTY_NEWLINE);
+	if (strncmp(conf->keepalive.req_endpoint_name, MGCP_CLIENT_KEEPALIVE_DEFAULT_ENDP,
+		    sizeof(conf->keepalive.req_endpoint_name)) != 0)
+		vty_out(vty, "%s%skeepalive request-endpoint %s%s", indent,  mgw_prefix,
+			conf->keepalive.req_endpoint_name, VTY_NEWLINE);
+	if (conf->keepalive.timeout_sec != 0)
+		vty_out(vty, "%s%skeepalive timeout %u%s", indent,  mgw_prefix,
+			conf->keepalive.timeout_sec, VTY_NEWLINE);
+
+	return CMD_SUCCESS;
+}
+
+/*! Write out MGCP client config to VTY.
+ *  \param[in] vty VTY to which we should print.
+ *  \param[in] string used for indentation (e.g. " ").
+ *  \returns CMD_SUCCESS on success, CMD_WARNING on error */
+int mgcp_client_config_write(struct vty *vty, const char *indent)
+{
+	/* If caller supports MGW pool API (mgcp_client_pool_vty_init was
+	 * called), then skip printing any config in this node and print it when
+	 * the whole 'mgw' node is printed. */
+	if (global_mgcp_client_pool)
+		return CMD_SUCCESS;
+	return config_write(vty, indent, global_mgcp_client_conf);
+}
+
+static void vty_init_common(void *talloc_ctx, int node)
 {
 	global_mgcp_client_ctx = talloc_ctx;
-	global_mgcp_client_conf = conf;
 
-	install_element(node, &cfg_mgw_local_ip_cmd);
-	install_element(node, &cfg_mgw_local_port_cmd);
-	install_element(node, &cfg_mgw_remote_ip_cmd);
-	install_element(node, &cfg_mgw_remote_port_cmd);
-	install_element(node, &cfg_mgw_endpoint_range_cmd);
-	install_element(node, &cfg_mgw_rtp_bts_base_port_cmd);
-	install_element(node, &cfg_mgw_endpoint_domain_name_cmd);
-
-	/* deprecated 'mgcpgw' commands */
-	install_element(node, &cfg_mgcpgw_local_ip_cmd);
-	install_element(node, &cfg_mgcpgw_local_port_cmd);
-	install_element(node, &cfg_mgcpgw_remote_ip_cmd);
-	install_element(node, &cfg_mgcpgw_remote_port_cmd);
-	install_element(node, &cfg_mgcpgw_endpoint_range_cmd);
-	install_element(node, &cfg_mgcpgw_rtp_bts_base_port_cmd);
+	/* deprecated 'mgw' commands ('mgw' prepended as first arg) */
+	install_lib_element(node, &cfg_mgw_mgw_local_ip_cmd);
+	install_lib_element(node, &cfg_mgw_mgw_local_port_cmd);
+	install_lib_element(node, &cfg_mgw_mgw_remote_ip_cmd);
+	install_lib_element(node, &cfg_mgw_mgw_remote_port_cmd);
+	install_lib_element(node, &cfg_mgw_mgw_endpoint_range_cmd);
+	install_lib_element(node, &cfg_mgw_mgw_endpoint_domain_name_cmd);
+	install_lib_element(node, &cfg_mgw_mgw_reset_ep_name_cmd);
+	install_lib_element(node, &cfg_mgw_mgw_no_reset_ep_name_cmd);
+	install_lib_element(node, &cfg_mgw_mgw_keepalive_req_interval_cmd);
+	install_lib_element(node, &cfg_mgw_mgw_keepalive_req_endpoint_cmd);
+	install_lib_element(node, &cfg_mgw_mgw_keepalive_timeout_cmd);
 
 	osmo_fsm_vty_add_cmds();
 }
+
+/*! Set up MGCP client VTY
+ *  (called once at startup by the application process).
+ *  \param[in] talloc_ctx talloc context to be used by the VTY for allocating memory.
+ *  \param[in] node identifier of the node on which the VTY commands should be installed.
+ *  \param[in] conf user provided memory to to store the MGCP client configuration data. */
+void mgcp_client_vty_init(void *talloc_ctx, int node, struct mgcp_client_conf *conf)
+{
+	global_mgcp_client_conf = conf;
+
+	/* deprecated 'mgcpgw' commands */
+	install_lib_element(node, &cfg_mgcpgw_local_ip_cmd);
+	install_lib_element(node, &cfg_mgcpgw_local_port_cmd);
+	install_lib_element(node, &cfg_mgcpgw_remote_ip_cmd);
+	install_lib_element(node, &cfg_mgcpgw_remote_port_cmd);
+	install_lib_element(node, &cfg_mgcpgw_endpoint_range_cmd);
+	install_lib_element(node, &cfg_mgcpgw_rtp_bts_base_port_cmd);
+
+	vty_init_common(talloc_ctx, node);
+}
+
+/* Mark whether user called mgcp_client_pool_config_write() and hence support new API */
+static bool mgcp_client_pool_config_write_called = false;
+
+static int _mgcp_client_pool_config_write(struct vty *vty, const char *indent)
+{
+	struct mgcp_client_pool *pool = global_mgcp_client_pool;
+	struct mgcp_client_pool_member *pool_member;
+	unsigned int subindent_buf_len;
+	char *subindent;
+
+	if (!indent)
+		indent = pool->vty_indent ? : "";
+	subindent_buf_len = strlen(indent) + 1 + 1;
+	subindent = talloc_zero_size(vty, subindent_buf_len);
+
+	snprintf(subindent, subindent_buf_len, "%s ", indent);
+
+	llist_for_each_entry(pool_member, &pool->member_list, list) {
+		vty_out(vty, "%smgw %u%s", indent, pool_member->nr, VTY_NEWLINE);
+		config_write(vty, subindent, &pool_member->conf);
+	}
+
+	/* MGW pool API is supported by user (global_mgcp_client_pool is set
+	 * because mgcp_client_pool_vty_init was called). If single MGW was
+	 * configured through old VTY and no mgw in the new MGW pool VTY is
+	 * replacing it, then output the single MGW converted to the new MGW
+	 * pool VTY. */
+	if (llist_empty(&pool->member_list) && pool->mgcp_client_single) {
+		vty_out(vty, "%smgw 0%s", indent, VTY_NEWLINE);
+		config_write(vty, subindent, global_mgcp_client_conf);
+	}
+
+	talloc_free(subindent);
+	return CMD_SUCCESS;
+}
+
+/* Deprecated, used for backward compatibility with older users which didn't call
+ * mgcp_client_pool_config_write(): */
+static int config_write_pool(struct vty *vty)
+{
+	if (mgcp_client_pool_config_write_called)
+		return CMD_SUCCESS;
+
+	return _mgcp_client_pool_config_write(vty, NULL);
+}
+
+/*! Write out MGCP client config to VTY.
+ *  \param[in] vty VTY to which we should print.
+ *  \param[in] indent string used for indentation (e.g. " ").
+	       If NULL, indentation passed during mgcp_client_pool_vty_init() will be used.
+ *  \returns CMD_SUCCESS on success, CMD_WARNING on error */
+int mgcp_client_pool_config_write(struct vty *vty, const char *indent)
+{
+	/* Tell internal node write function that the user supports calling proper API: */
+	mgcp_client_pool_config_write_called = true;
+	return _mgcp_client_pool_config_write(vty, indent);
+}
+
+DEFUN_ATTR(cfg_mgw,
+	   cfg_mgw_cmd, "mgw <0-255>", "Select a MGCP client config to setup\n" "reference number\n", CMD_ATTR_IMMEDIATE)
+{
+	int nr = atoi(argv[0]);
+	struct mgcp_client_pool_member *pool_member;
+
+	pool_member = mgcp_client_pool_find_member_by_nr(global_mgcp_client_pool, nr);
+	if (!pool_member) {
+		pool_member = mgcp_client_pool_member_alloc(global_mgcp_client_pool, nr);
+		OSMO_ASSERT(pool_member);
+	}
+
+	vty->index = &pool_member->conf;
+	vty->index_sub = &pool_member->conf.description;
+	vty->node = global_mgcp_client_pool->vty_node->node;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN_ATTR(cfg_no_mgw,
+	   cfg_no_mgw_cmd,
+	   "no mgw <0-255>", NO_STR "Select a MGCP client config to remove\n" "reference number\n", CMD_ATTR_IMMEDIATE)
+{
+	int nr = atoi(argv[0]);
+	struct mgcp_client_pool_member *pool_member;
+
+	pool_member = mgcp_client_pool_find_member_by_nr(global_mgcp_client_pool, nr);
+	if (!pool_member) {
+		vty_out(vty, "%% no such MGCP client configured ('%s')%s", argv[0], VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	/* Make sure that there are no ongoing calls */
+	if (pool_member->refcount > 0) {
+		vty_out(vty, "%% MGCP client (MGW %s) is still serving ongoing calls -- can't remove it now!%s",
+			mgcp_client_pool_member_name(pool_member), VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	mgcp_client_pool_member_free(pool_member);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN_ATTR(mgw_reconnect, mgw_reconnect_cmd,
+	   "mgw <0-255> reconnect",
+	   MGW_STR "reference number\n" "reconfigure and reconnect MGCP client\n", CMD_ATTR_IMMEDIATE)
+{
+	int nr = atoi(argv[0]);
+	struct mgcp_client_pool_member *pool_member = NULL;
+
+	pool_member = mgcp_client_pool_find_member_by_nr(global_mgcp_client_pool, nr);
+	if (!pool_member) {
+		vty_out(vty, "%% no such MGCP client configured ('%s')%s", argv[0], VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	/* Make sure that there are no ongoing calls */
+	if (pool_member->refcount > 0) {
+		vty_out(vty, "%% MGCP client (MGW %s) is still serving ongoing calls -- can't reconnect it now!%s",
+			mgcp_client_pool_member_name(pool_member), VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	if (mgcp_client_pool_member_reinit_client(pool_member) < 0) {
+		LOGP(DLMGCP, LOGL_ERROR, "(manual) MGW %s connect failed at (%s:%u)\n",
+		     mgcp_client_pool_member_name(pool_member), pool_member->conf.remote_addr,
+		     pool_member->conf.remote_port);
+		vty_out(vty, "%% MGCP client (MGW %s) initalization failed ('%s')%s",
+			mgcp_client_pool_member_name(pool_member), argv[0], VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN_ATTR(mgw_block, mgw_block_cmd,
+	   "mgw <0-255> block",
+	   MGW_STR "reference number\n" "block MGCP client so that it won't be used for new calls\n", CMD_ATTR_IMMEDIATE)
+{
+	int nr = atoi(argv[0]);
+	struct mgcp_client_pool_member *pool_member = NULL;
+
+	pool_member = mgcp_client_pool_find_member_by_nr(global_mgcp_client_pool, nr);
+	if (!pool_member) {
+		vty_out(vty, "%% no such MGCP client configured ('%s')%s", argv[0], VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	pool_member->blocked = true;
+	return CMD_SUCCESS;
+}
+
+DEFUN_ATTR(mgw_unblock, mgw_unblock_cmd,
+	   "mgw <0-255> unblock",
+	   MGW_STR "reference number\n" "unblock MGCP client so that it will be available for new calls\n", CMD_ATTR_IMMEDIATE)
+{
+	int nr = atoi(argv[0]);
+	struct mgcp_client_pool_member *pool_member = NULL;
+
+	pool_member = mgcp_client_pool_find_member_by_nr(global_mgcp_client_pool, nr);
+	if (!pool_member) {
+		vty_out(vty, "%% no such MGCP client configured ('%s')%s", argv[0], VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	pool_member->blocked = false;
+	return CMD_SUCCESS;
+}
+
+DEFUN(mgw_show, mgw_show_cmd, "show mgw-pool", SHOW_STR "Display information about the MGW-Pool\n")
+{
+	vty_out(vty, "%% MGW-Pool:%s", VTY_NEWLINE);
+	struct mgcp_client_pool_member *pool_member;
+
+	if (llist_empty(&global_mgcp_client_pool->member_list) && global_mgcp_client_pool->mgcp_client_single) {
+		vty_out(vty, "%%  (pool is empty, single MGCP client will be used)%s", VTY_NEWLINE);
+		return CMD_SUCCESS;
+	} else if (llist_empty(&global_mgcp_client_pool->member_list)) {
+		vty_out(vty, "%%  (pool is empty)%s", VTY_NEWLINE);
+		return CMD_SUCCESS;
+	}
+
+	llist_for_each_entry(pool_member, &global_mgcp_client_pool->member_list, list) {
+		const struct mgcp_client *cli = pool_member->client;
+		vty_out(vty, "%%  MGW %s%s", mgcp_client_pool_member_name(pool_member), VTY_NEWLINE);
+		vty_out(vty, "%%   MGCP link:     %s,%s%s",
+			cli && cli->wq.bfd.fd != -1 ? "connected" : "disconnected",
+			cli && cli->conn_up ?
+				((cli->actual.keepalive.timeout_sec > 0) ? "UP" : "MAYBE") :
+				"DOWN",
+			VTY_NEWLINE);
+		vty_out(vty, "%%   service:       %s%s", pool_member->blocked ? "blocked" : "unblocked", VTY_NEWLINE);
+		vty_out(vty, "%%   ongoing calls: %u%s", pool_member->refcount, VTY_NEWLINE);
+	}
+	return CMD_SUCCESS;
+}
+
+/*! Set up MGCP client VTY (pooled)
+ *  (called once at startup by the application process).
+ *  \param[in] parent_node identifier of the parent node on which the mgw node appears.
+ *  \param[in] mgw_node identifier that should be used with the newly installed MGW node.
+ *  \param[in] indent indentation string to match the indentation in the VTY config.
+	       If NULL, it must be passed explicitly each time mgcp_client_pool_config_write() is called.
+ *  \param[in] pool user provided memory to store the configured MGCP client (MGW) pool. */
+void mgcp_client_pool_vty_init(int parent_node, int mgw_node, const char *indent, struct mgcp_client_pool *pool)
+{
+	/* A pool must be allocated before this function can be called */
+	OSMO_ASSERT(pool);
+
+	/* Never allow this function to be called twice on the same pool */
+	OSMO_ASSERT(!pool->vty_node);
+
+	if (indent) {
+		pool->vty_indent = talloc_strdup(pool, indent);
+		OSMO_ASSERT(pool->vty_indent);
+	}
+	pool->vty_node = talloc_zero(pool, struct cmd_node);
+	OSMO_ASSERT(pool->vty_node);
+	pool->vty_node->node = mgw_node;
+	pool->vty_node->vtysh = 1;
+	pool->vty_node->prompt = talloc_strdup(pool->vty_node, "%s(config-mgw)# ");
+
+	install_lib_element(parent_node, &cfg_mgw_cmd);
+	install_lib_element(parent_node, &cfg_no_mgw_cmd);
+
+	/* Note: config_write_pool is deprecated and user is expected to
+	 * manually call mgcp_client_pool_config_write() when printing the VTY
+	 * config */
+	install_node(pool->vty_node, config_write_pool);
+	vty_init_common(pool, mgw_node);
+	install_lib_element(mgw_node, &cfg_mgw_local_ip_cmd);
+	install_lib_element(mgw_node, &cfg_mgw_local_port_cmd);
+	install_lib_element(mgw_node, &cfg_mgw_remote_ip_cmd);
+	install_lib_element(mgw_node, &cfg_mgw_remote_port_cmd);
+	install_lib_element(mgw_node, &cfg_mgw_rtp_bts_base_port_cmd);
+	install_lib_element(mgw_node, &cfg_mgw_endpoint_domain_name_cmd);
+	install_lib_element(mgw_node, &cfg_mgw_reset_ep_name_cmd);
+	install_lib_element(mgw_node, &cfg_mgw_no_reset_ep_name_cmd);
+
+	install_element(mgw_node, &cfg_description_cmd);
+
+	install_lib_element(ENABLE_NODE, &mgw_reconnect_cmd);
+	install_lib_element(ENABLE_NODE, &mgw_block_cmd);
+	install_lib_element(ENABLE_NODE, &mgw_unblock_cmd);
+
+	install_lib_element_ve(&mgw_show_cmd);
+
+	global_mgcp_client_pool = pool;
+}

src/libosmo-mgcp/Makefile.am

@@ -10,26 +10,24 @@ AM_CFLAGS = \
 	$(LIBOSMOGSM_CFLAGS) \
 	$(LIBOSMOVTY_CFLAGS) \
 	$(LIBOSMONETIF_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMOTRAU_CFLAGS) \
 	$(COVERAGE_CFLAGS) \
 	$(NULL)
 
 AM_LDFLAGS = \
-	$(LIBOSMOCORE_LIBS) \
-	$(LIBOSMOGSM_LIBS) \
-	$(LIBOSMOVTY_LIBS) \
-	$(LIBOSMONETIF_LIBS) \
 	$(COVERAGE_LDFLAGS) \
 	$(NULL)
 
-noinst_LIBRARIES = \
-	libosmo-mgcp.a \
+noinst_LTLIBRARIES = \
+	libosmo-mgcp.la \
 	$(NULL)
 
 noinst_HEADERS = \
 	g711common.h \
 	$(NULL)
 
-libosmo_mgcp_a_SOURCES = \
+libosmo_mgcp_la_SOURCES = \
 	mgcp_protocol.c \
 	mgcp_network.c \
 	mgcp_vty.c \
@@ -40,4 +38,18 @@ libosmo_mgcp_a_SOURCES = \
 	mgcp_conn.c \
 	mgcp_stat.c \
 	mgcp_endp.c \
+	mgcp_trunk.c \
+	mgcp_ratectr.c \
+	mgcp_e1.c \
+	mgcp_iuup.c \
+	$(NULL)
+
+libosmo_mgcp_la_LIBADD = \
+	$(top_builddir)/src/libosmo-sdp/libosmo-sdp.la \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBOSMONETIF_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBOSMOTRAU_LIBS) \
 	$(NULL)

src/libosmo-mgcp/g711common.h

@@ -14,10 +14,6 @@
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
 static inline int val_seg(int val)

src/libosmo-mgcp/mgcp_codec.c

@@ -17,8 +17,17 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-#include <osmocom/mgcp/mgcp_internal.h>
+#include <osmocom/mgcp/mgcp.h>
+#include <osmocom/mgcp/osmux.h>
+#include <osmocom/mgcp/mgcp_conn.h>
+#include <osmocom/mgcp/mgcp_protocol.h>
 #include <osmocom/mgcp/mgcp_endp.h>
+#include <osmocom/mgcp/mgcp_trunk.h>
+#include <osmocom/mgcp/mgcp_codec.h>
+
+#include <osmocom/sdp/sdp_strings.h>
+#include <osmocom/sdp/fmtp.h>
+
 #include <errno.h>
 
 /* Helper function to dump codec information of a specified codec to a printable
@@ -56,8 +65,8 @@ void mgcp_codec_summary(struct mgcp_conn_rtp *conn)
 	endp = conn->conn->endp;
 
 	if (rtp->codecs_assigned == 0) {
-		LOGP(DLMGCP, LOGL_ERROR, "endpoint:0x%x conn:%s no codecs available\n", ENDPOINT_NUMBER(endp),
-		     mgcp_conn_dump(conn->conn));
+		LOGPENDP(endp, DLMGCP, LOGL_ERROR, "conn:%s no codecs available\n",
+			 mgcp_conn_dump(conn->conn));
 		return;
 	}
 
@@ -65,8 +74,8 @@ void mgcp_codec_summary(struct mgcp_conn_rtp *conn)
 	for (i = 0; i < rtp->codecs_assigned; i++) {
 		codec = &rtp->codecs[i];
 
-		LOGP(DLMGCP, LOGL_DEBUG, "endpoint:0x%x conn:%s codecs[%u]:%s", ENDPOINT_NUMBER(endp),
-		     mgcp_conn_dump(conn->conn), i, dump_codec(codec));
+		LOGPENDP(endp, DLMGCP, LOGL_DEBUG, "conn:%s codecs[%u]:%s",
+			 mgcp_conn_dump(conn->conn), i, dump_codec(codec));
 
 		if (codec == rtp->codec)
 			LOGPC(DLMGCP, LOGL_DEBUG, " [selected]");
@@ -76,36 +85,57 @@ void mgcp_codec_summary(struct mgcp_conn_rtp *conn)
 }
 
 /* Initalize or reset codec information with default data. */
-void codec_init(struct mgcp_rtp_codec *codec)
+static void codec_init(struct mgcp_rtp_codec *codec)
 {
-	if (codec->subtype_name)
-		talloc_free(codec->subtype_name);
-	if (codec->audio_name)
-		talloc_free(codec->audio_name);
-	memset(codec, 0, sizeof(*codec));
-	codec->payload_type = -1;
-	codec->frame_duration_num = DEFAULT_RTP_AUDIO_FRAME_DUR_NUM;
-	codec->frame_duration_den = DEFAULT_RTP_AUDIO_FRAME_DUR_DEN;
-	codec->rate = DEFAULT_RTP_AUDIO_DEFAULT_RATE;
-	codec->channels = DEFAULT_RTP_AUDIO_DEFAULT_CHANNELS;
+	*codec = (struct mgcp_rtp_codec){
+		.payload_type = -1,
+		.frame_duration_num = DEFAULT_RTP_AUDIO_FRAME_DUR_NUM,
+		.frame_duration_den = DEFAULT_RTP_AUDIO_FRAME_DUR_DEN,
+		.rate = DEFAULT_RTP_AUDIO_DEFAULT_RATE,
+		.channels = DEFAULT_RTP_AUDIO_DEFAULT_CHANNELS,
+		.subtype_name = "",
+		.audio_name = "",
+	};
+}
+
+static void codec_free(struct mgcp_rtp_codec *codec)
+{
+	*codec = (struct mgcp_rtp_codec){};
 }
 
 /*! Initalize or reset codec information with default data.
  *  \param[out] conn related rtp-connection. */
 void mgcp_codec_reset_all(struct mgcp_conn_rtp *conn)
 {
-	memset(conn->end.codecs, 0, sizeof(conn->end.codecs));
+	int i;
+	for (i = 0; i < conn->end.codecs_assigned; i++)
+		codec_free(&conn->end.codecs[i]);
 	conn->end.codecs_assigned = 0;
 	conn->end.codec = NULL;
 }
 
-/* Set members of struct mgcp_rtp_codec, extrapolate in missing information */
-static int codec_set(void *ctx, struct mgcp_rtp_codec *codec,
-		     int payload_type, const char *audio_name, unsigned int pt_offset)
+/*! Add codec configuration depending on payload type and/or codec name. This
+ *  function uses the input parameters to extrapolate the full codec information.
+ *  \param[out] codec configuration (caller provided memory).
+ *  \param[out] conn related rtp-connection.
+ *  \param[in] payload_type codec type id (e.g. 3 for GSM, -1 when undefined).
+ *  \param[in] audio_name audio codec name, in uppercase (e.g. "GSM/8000/1").
+ *  \param[in] fmtp optional codec parameters (set to NULL when unused).
+ *  \returns 0 on success, -EINVAL on failure. */
+int mgcp_codec_add2(struct mgcp_conn_rtp *conn, int payload_type, const char *audio_name, const char *fmtp)
 {
 	int rate;
 	int channels;
-	char audio_codec[64];
+	struct mgcp_rtp_codec *codec;
+	unsigned int pt_offset = conn->end.codecs_assigned;
+
+	/* The amount of codecs we can store is limited, make sure we do not
+	 * overrun this limit. */
+	if (conn->end.codecs_assigned >= MGCP_MAX_CODECS)
+		return -EINVAL;
+
+	/* First unused entry */
+	codec = &conn->end.codecs[conn->end.codecs_assigned];
 
 	/* Initalize the codec struct with some default data to begin with */
 	codec_init(codec);
@@ -113,12 +143,13 @@ static int codec_set(void *ctx, struct mgcp_rtp_codec *codec,
 	if (payload_type != PTYPE_UNDEFINED) {
 		/* Make sure we do not get any reserved or undefined type numbers */
 		/* See also: https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml */
-		if (payload_type == 1 || payload_type == 2 || payload_type == 19)
-			goto error;
-		if (payload_type >= 72 && payload_type <= 76)
-			goto error;
-		if (payload_type >= 127)
+		if ((payload_type == 1 || payload_type == 2 || payload_type == 19)
+		    || (payload_type >= 72 && payload_type <= 76)
+		    || (payload_type >= 127)) {
+			LOGP(DLMGCP, LOGL_ERROR, "Cannot add codec, payload type number %d is reserved\n",
+			     payload_type);
 			goto error;
+		}
 
 		codec->payload_type = payload_type;
 	}
@@ -129,46 +160,55 @@ static int codec_set(void *ctx, struct mgcp_rtp_codec *codec,
 	if (!audio_name) {
 		switch (payload_type) {
 		case 0:
-			audio_name = talloc_strdup(ctx, "PCMU/8000/1");
+			strcpy(codec->audio_name, "PCMU/8000/1");
 			break;
 		case 3:
-			audio_name = talloc_strdup(ctx, "GSM/8000/1");
+			strcpy(codec->audio_name, "GSM/8000/1");
 			break;
 		case 8:
-			audio_name = talloc_strdup(ctx, "PCMA/8000/1");
+			strcpy(codec->audio_name, "PCMA/8000/1");
 			break;
 		case 18:
-			audio_name = talloc_strdup(ctx, "G729/8000/1");
+			strcpy(codec->audio_name, "G729/8000/1");
 			break;
 		default:
 			/* The given payload type is not known to us, or it
 			 * it is a dynamic payload type for which we do not
 			 * know the audio name. We must give up here */
+			LOGP(DLMGCP, LOGL_ERROR, "No audio codec name given, and payload type %d unknown\n",
+			     payload_type);
 			goto error;
 		}
+	} else {
+		OSMO_STRLCPY_ARRAY(codec->audio_name, audio_name);
 	}
 
 	/* Now we extract the codec subtype name, rate and channels. The latter
 	 * two are optional. If they are not present we use the safe defaults
 	 * above. */
-	if (strlen(audio_name) > sizeof(audio_codec))
+	if (strlen(codec->audio_name) >= sizeof(codec->subtype_name)) {
+		LOGP(DLMGCP, LOGL_ERROR, "Audio codec too long: %s\n", osmo_quote_str(codec->audio_name, -1));
 		goto error;
+	}
 	channels = DEFAULT_RTP_AUDIO_DEFAULT_CHANNELS;
 	rate = DEFAULT_RTP_AUDIO_DEFAULT_RATE;
-	if (sscanf(audio_name, "%63[^/]/%d/%d", audio_codec, &rate, &channels) < 1)
+	if (sscanf(codec->audio_name, "%63[^/]/%d/%d", codec->subtype_name, &rate, &channels) < 1) {
+		LOGP(DLMGCP, LOGL_ERROR, "Invalid audio codec: %s\n", osmo_quote_str(codec->audio_name, -1));
 		goto error;
+	}
 
 	/* Note: We only accept configurations with one audio channel! */
-	if (channels != 1)
+	if (channels != 1) {
+		LOGP(DLMGCP, LOGL_ERROR, "Cannot handle audio codec with more than one channel: %s\n",
+		     osmo_quote_str(codec->audio_name, -1));
 		goto error;
+	}
 
 	codec->rate = rate;
 	codec->channels = channels;
-	codec->subtype_name = talloc_strdup(ctx, audio_codec);
-	codec->audio_name = talloc_strdup(ctx, audio_name);
 	codec->payload_type = payload_type;
 
-	if (!strcmp(audio_codec, "G729")) {
+	if (!strcmp(codec->subtype_name, "G729")) {
 		codec->frame_duration_num = 10;
 		codec->frame_duration_den = 1000;
 	} else {
@@ -178,6 +218,7 @@ static int codec_set(void *ctx, struct mgcp_rtp_codec *codec,
 
 	/* Derive the payload type if it is unknown */
 	if (codec->payload_type == PTYPE_UNDEFINED) {
+		/* TODO: This is semi dead code, see OS#4150 */
 
 		/* For the known codecs from the static range we restore
 		 * the IANA or 3GPP assigned payload type number */
@@ -213,139 +254,74 @@ static int codec_set(void *ctx, struct mgcp_rtp_codec *codec,
 		 * 110 onwards 3gpp defines prefered codec types, which are
 		 * also fixed, see above)  */
 		if (codec->payload_type < 0) {
+			/* FIXME: pt_offset is completely unrelated and useless here, any of those numbers may already
+			 * have been added to the codecs. Instead, there should be an iterator checking for an actually
+			 * unused dynamic payload type number. */
 			codec->payload_type = 96 + pt_offset;
-			if (codec->payload_type > 109)
+			if (codec->payload_type > 109) {
+				LOGP(DLMGCP, LOGL_ERROR, "Ran out of payload type numbers to assign dynamically\n");
 				goto error;
+			}
 		}
 	}
 
+	if (fmtp) {
+		OSMO_STRLCPY_ARRAY(codec->fmtp, fmtp);
+		if (strlen(codec->fmtp) != strlen(fmtp)) {
+			LOGP(DLMGCP, LOGL_ERROR, "fmtp too long: %zu > %zu\n", strlen(fmtp), strlen(codec->fmtp));
+			/* let's just hope what is there is still useful, worst case the call's audio doesn't work */
+		}
+	}
+
+	/* legacy */
+	codec->param_present = false;
+
+	conn->end.codecs_assigned++;
 	return 0;
 error:
 	/* Make sure we leave a clean codec entry on error. */
-	codec_init(codec);
-	memset(codec, 0, sizeof(*codec));
+	codec_free(codec);
 	return -EINVAL;
 }
 
-/*! Add codec configuration depending on payload type and/or codec name. This
+/*! Legacy compat, use mgcp_codec_add2() instead to be able to pass any fmtp besides AMR octet-align=1.
+ * Add codec configuration depending on payload type and/or codec name. This
  *  function uses the input parameters to extrapolate the full codec information.
  *  \param[out] codec configuration (caller provided memory).
  *  \param[out] conn related rtp-connection.
  *  \param[in] payload_type codec type id (e.g. 3 for GSM, -1 when undefined).
- *  \param[in] audio_name audio codec name (e.g. "GSM/8000/1").
+ *  \param[in] audio_name audio codec name, in uppercase (e.g. "GSM/8000/1").
+ *  \param[in] param optional codec parameters (set to NULL when unused).
  *  \returns 0 on success, -EINVAL on failure. */
-int mgcp_codec_add(struct mgcp_conn_rtp *conn, int payload_type, const char *audio_name)
+int mgcp_codec_add(struct mgcp_conn_rtp *conn, int payload_type, const char *audio_name, const struct mgcp_codec_param *param)
 {
-	int rc;
+	const char *fmtp = NULL;
+	if (param && param->amr_octet_aligned_present)
+		fmtp = (param->amr_octet_aligned ? OSMO_SDP_STR_AMR_OCTET_ALIGN_1 : OSMO_SDP_STR_AMR_OCTET_ALIGN_0);
 
-	/* The amount of codecs we can store is limited, make sure we do not
-	 * overrun this limit. */
-	if (conn->end.codecs_assigned >= MGCP_MAX_CODECS)
-		return -EINVAL;
-
-	rc = codec_set(conn->conn, &conn->end.codecs[conn->end.codecs_assigned], payload_type, audio_name,
-		       conn->end.codecs_assigned);
-	if (rc != 0)
-		return -EINVAL;
-
-	conn->end.codecs_assigned++;
-
-	return 0;
+	return mgcp_codec_add2(conn, payload_type, audio_name, fmtp);
 }
 
-/* Check if the given codec is applicable on the specified endpoint
- * Helper function for mgcp_codec_decide() */
-static bool is_codec_compatible(const struct mgcp_endpoint *endp, const struct mgcp_rtp_codec *codec)
+bool mgcp_codec_amr_is_octet_aligned(const struct mgcp_rtp_codec *codec)
 {
-	char codec_name[64];
+	/* Legacy */
+	if (!codec->fmtp[0]
+	    && codec->param_present
+	    && codec->param.amr_octet_aligned_present)
+		return codec->param.amr_octet_aligned;
 
-	/* A codec name must be set, if not, this might mean that the codec
-	 * (payload type) that was assigned is unknown to us so we must stop
-	 * here. */
-	if (!codec->subtype_name)
+	return osmo_sdp_fmtp_amr_is_octet_aligned(codec->fmtp);
+}
+
+/* Compare two codecs, all parameters must match up */
+static bool codecs_same(struct mgcp_rtp_codec *codec_a, struct mgcp_rtp_codec *codec_b)
+{
+	/* All codec properties must match up, except the payload type number. Even though standardisd payload numbers
+	 * exist for certain situations, the call agent may still assign them freely. Hence we must not insist on equal
+	 * payload type numbers. Also the audio_name is not checked since it is already parsed into subtype_name, rate,
+	 * and channels, which are checked. */
+	if (strcmp(codec_a->subtype_name, codec_b->subtype_name))
 		return false;
-
-	/* We now extract the codec_name (letters before the /, e.g. "GSM"
-	 * from the audio name that is stored in the trunk configuration.
-	 * We do not compare to the full audio_name because we expect that
-	 * "GSM", "GSM/8000" and "GSM/8000/1" are all compatible when the
-	 * audio name of the codec is set to "GSM" */
-	if (sscanf(endp->tcfg->audio_name, "%63[^/]/%*d/%*d", codec_name) < 1)
-		return false;
-
-	/* Finally we check if the subtype_name we have generated from the
-	 * audio_name in the trunc struct patches the codec_name of the
-	 * given codec */
-	if (strcasecmp(codec_name, codec->subtype_name) == 0)
-		return true;
-
-	/* FIXME: It is questinable that the method to pick a compatible
-	 * codec can work properly. Since this useses tcfg->audio_name, as
-	 * a reference, which is set to "AMR/8000" permanently.
-	 * tcfg->audio_name must be updated by the first connection that
-	 * has been made on an endpoint, so that the second connection
-	 * can make a meaningful decision here */
-
-	return false;
-}
-
-/*! Decide for one suitable codec
- *  \param[in] conn related rtp-connection.
- *  \returns 0 on success, -EINVAL on failure. */
-int mgcp_codec_decide(struct mgcp_conn_rtp *conn)
-{
-	struct mgcp_rtp_end *rtp;
-	unsigned int i;
-	struct mgcp_endpoint *endp;
-	bool codec_assigned = false;
-
-	endp = conn->conn->endp;
-	rtp = &conn->end;
-
-	/* This function works on the results the SDP/LCO parser has extracted
-	 * from the MGCP message. The goal is to select a suitable codec for
-	 * the given connection. When transcoding is available, the first codec
-	 * from the codec list is taken without further checking. When
-	 * transcoding is not available, then the choice must be made more
-	 * carefully. Each codec in the list is checked until one is found that
-	 * is rated compatible. The rating is done by the helper function
-	 * is_codec_compatible(), which does the actual checking. */
-	for (i = 0; i < rtp->codecs_assigned; i++) {
-		/* When no transcoding is available, avoid codecs that would
-		 * require transcoding. */
-		if (endp->tcfg->no_audio_transcoding && !is_codec_compatible(endp, &rtp->codecs[i])) {
-			LOGP(DLMGCP, LOGL_NOTICE, "transcoding not available, skipping codec: %d/%s\n",
-			     rtp->codecs[i].payload_type, rtp->codecs[i].subtype_name);
-			continue;
-		}
-
-		rtp->codec = &rtp->codecs[i];
-		codec_assigned = true;
-		break;
-	}
-
-	/* FIXME: To the reviewes: This is problematic. I do not get why we
-	 * need to reset the packet_duration_ms depending on the codec
-	 * selection. I thought it were all 20ms? Is this to address some
-	 * cornercase. (This piece of code was in the code path before,
-	 * together with the note: "TODO/XXX: Store this per codec and derive
-	 * it on use" */
-	if (codec_assigned) {
-		if (rtp->maximum_packet_time >= 0
-		    && rtp->maximum_packet_time * rtp->codec->frame_duration_den >
-		    rtp->codec->frame_duration_num * 1500)
-			rtp->packet_duration_ms = 0;
-
-		return 0;
-	}
-
-	return -EINVAL;
-}
-
-/* Compare two codecs, all parameters must match up, except for the payload type
- * number. */
-static bool codecs_cmp(struct mgcp_rtp_codec *codec_a, struct mgcp_rtp_codec *codec_b)
-{
 	if (codec_a->rate != codec_b->rate)
 		return false;
 	if (codec_a->channels != codec_b->channels)
@@ -354,57 +330,217 @@ static bool codecs_cmp(struct mgcp_rtp_codec *codec_a, struct mgcp_rtp_codec *co
 		return false;
 	if (codec_a->frame_duration_den != codec_b->frame_duration_den)
 		return false;
-	if (strcmp(codec_a->audio_name, codec_b->audio_name))
-		return false;
+
+	/* AMR payload may be formatted in two different payload formats, it is still the same codec but since the
+	 * formatting of the payload is different, conversation is required, so we must treat it as a different
+	 * codec here. */
+	if (strcmp(codec_a->subtype_name, "AMR") == 0) {
+		if (mgcp_codec_amr_is_octet_aligned(codec_a) != mgcp_codec_amr_is_octet_aligned(codec_b))
+			return false;
+	}
+
+	return true;
+}
+
+/* Compare two codecs, all parameters must match up, except parameters related to payload formatting (not checked). */
+static bool codecs_convertible(struct mgcp_rtp_codec *codec_a, struct mgcp_rtp_codec *codec_b)
+{
+	/* OsmoMGW currently has no ability to transcode from one codec to another. However OsmoMGW is still able to
+	 * translate between different payload formats as long as the encoded voice data itself does not change.
+	 * Therefore we must insist on equal codecs but still allow different payload formatting. */
+
+	/* In 3G IuUP, AMR may be encapsulated in IuFP, this means even though the codec name and negotiated rate is
+	 * different, the formatting can still be converted by OsmoMGW. Therefore we won't insist on equal
+	 * subtype_name and rate if we detect IuFP and AMR is used on the same tandem. */
+	if (strcmp(codec_a->subtype_name, "AMR") == 0 && strcmp(codec_b->subtype_name, "VND.3GPP.IUFP") == 0)
+		goto iufp;
+	if (strcmp(codec_a->subtype_name, "VND.3GPP.IUFP") == 0 && strcmp(codec_b->subtype_name, "AMR") == 0)
+		goto iufp;
+
 	if (strcmp(codec_a->subtype_name, codec_b->subtype_name))
 		return false;
+	if (codec_a->rate != codec_b->rate)
+		return false;
+iufp:
+	if (codec_a->channels != codec_b->channels)
+		return false;
+	if (codec_a->frame_duration_num != codec_b->frame_duration_num)
+		return false;
+	if (codec_a->frame_duration_den != codec_b->frame_duration_den)
+		return false;
 
 	return true;
 }
 
-/*! Translate a given payload type number that belongs to the packet of a
- *  source connection to the equivalent payload type number that matches the
- *  configuration of a destination connection.
- *  \param[in] conn_src related source rtp-connection.
- *  \param[in] conn_dst related destination rtp-connection.
- *  \param[in] payload_type number from the source packet or source connection.
- *  \returns translated payload type number on success, -EINVAL on failure. */
-int mgcp_codec_pt_translate(struct mgcp_conn_rtp *conn_src, struct mgcp_conn_rtp *conn_dst, int payload_type)
+struct mgcp_rtp_codec *mgcp_codec_find_same(struct mgcp_conn_rtp *conn, struct mgcp_rtp_codec *codec)
 {
-	struct mgcp_rtp_end *rtp_src;
-	struct mgcp_rtp_end *rtp_dst;
-	struct mgcp_rtp_codec *codec_src = NULL;
-	struct mgcp_rtp_codec *codec_dst = NULL;
+	struct mgcp_rtp_end *rtp_end;
 	unsigned int i;
 	unsigned int codecs_assigned;
 
-	rtp_src = &conn_src->end;
-	rtp_dst = &conn_dst->end;
+	rtp_end = &conn->end;
 
-	/* Find the codec information that is used on the source side */
-	codecs_assigned = rtp_src->codecs_assigned;
+	/* Use the codec information from the source and try to find the equivalent of it on the destination side. In
+	 * the first run we will look for an exact match. */
+	codecs_assigned = rtp_end->codecs_assigned;
 	OSMO_ASSERT(codecs_assigned <= MGCP_MAX_CODECS);
 	for (i = 0; i < codecs_assigned; i++) {
-		if (payload_type == rtp_src->codecs[i].payload_type) {
-			codec_src = &rtp_src->codecs[i];
+		if (codecs_same(codec, &rtp_end->codecs[i])) {
+			return &rtp_end->codecs[i];
 			break;
 		}
 	}
-	if (!codec_src)
-		return -EINVAL;
 
-	/* Use the codec infrmation from the source and try to find the
-	 * equivalent of it on the destination side */
-	codecs_assigned = rtp_dst->codecs_assigned;
-	OSMO_ASSERT(codecs_assigned <= MGCP_MAX_CODECS);
-	for (i = 0; i < codecs_assigned; i++) {
-		if (codecs_cmp(codec_src, &rtp_dst->codecs[i])) {
-			codec_dst = &rtp_dst->codecs[i];
-			break;
-		}
-	}
-	if (!codec_dst)
-		return -EINVAL;
-
-	return codec_dst->payload_type;
+	return NULL;
+}
+
+/* For a given codec, find a convertible codec in the given connection. */
+static struct mgcp_rtp_codec *codec_find_convertible(struct mgcp_conn_rtp *conn, struct mgcp_rtp_codec *codec)
+{
+	struct mgcp_rtp_end *rtp_end;
+	unsigned int i;
+	unsigned int codecs_assigned;
+	struct mgcp_rtp_codec *codec_convertible = NULL;
+
+	rtp_end = &conn->end;
+
+	/* Use the codec information from the source and try to find the equivalent of it on the destination side. In
+	 * the first run we will look for an exact match. */
+	codec_convertible = mgcp_codec_find_same(conn, codec);
+	if (codec_convertible)
+		return codec_convertible;
+
+	/* In case we weren't able to find an exact match, we will try to find a match that is the same codec, but the
+	 * payload format may be different. This alternative will require a frame format conversion (i.e. AMR bwe->oe) */
+	codecs_assigned = rtp_end->codecs_assigned;
+	OSMO_ASSERT(codecs_assigned <= MGCP_MAX_CODECS);
+	for (i = 0; i < codecs_assigned; i++) {
+		if (codecs_convertible(codec, &rtp_end->codecs[i])) {
+			codec_convertible = &rtp_end->codecs[i];
+			break;
+		}
+	}
+
+	return codec_convertible;
+}
+
+/*! Decide for one suitable codec on both of the given connections. In case a destination connection is not available,
+ *  a tentative decision is made.
+ *  \param[inout] conn_src related rtp-connection.
+ *  \param[inout] conn_dst related destination rtp-connection (NULL if not present).
+ *  \returns 0 on success, -EINVAL on failure. */
+int mgcp_codec_decide(struct mgcp_conn_rtp *conn_src, struct mgcp_conn_rtp *conn_dst)
+{
+	unsigned int i;
+
+	/* In case no destination connection is available (yet), or in case the destination connection exists but has
+	 * no codecs assigned, we are forced to make a simple tentative decision:
+	 * We just use the first codec of the source connection (conn_src) */
+	OSMO_ASSERT(conn_src->end.codecs_assigned <= MGCP_MAX_CODECS);
+	if (!conn_dst || conn_dst->end.codecs_assigned == 0) {
+		if (conn_src->end.codecs_assigned >= 1) {
+			conn_src->end.codec = &conn_src->end.codecs[0];
+			return 0;
+		} else
+			return -EINVAL;
+	}
+
+	/* Compare all codecs of the source connection (conn_src) to the codecs of the destination connection (conn_dst). In case
+	 * of a match set this codec on both connections. This would be an ideal selection since no codec conversion would be
+	 * required. */
+	for (i = 0; i < conn_src->end.codecs_assigned; i++) {
+		struct mgcp_rtp_codec *codec_conn_src = &conn_src->end.codecs[i];
+		struct mgcp_rtp_codec *codec_conn_dst = mgcp_codec_find_same(conn_dst, codec_conn_src);
+		if (codec_conn_dst) {
+			/* We found the a codec that is exactly the same (same codec, same payload format etc.) on both
+			 * sides. We now set this codec on both connections. */
+			conn_dst->end.codec = codec_conn_dst;
+			conn_src->end.codec = codec_conn_src;
+			return 0;
+		}
+	}
+
+	/* In case we could not find a codec that is exactly the same, let's at least try to find a codec that we are able
+	 * to convert. */
+	for (i = 0; i < conn_src->end.codecs_assigned; i++) {
+		struct mgcp_rtp_codec *codec_conn_src = &conn_src->end.codecs[i];
+		struct mgcp_rtp_codec *codec_conn_dst = codec_find_convertible(conn_dst, codec_conn_src);
+		if (codec_conn_dst) {
+			/* We found the a codec that we can convert to. Set each side to its codec. */
+			conn_dst->end.codec = codec_conn_dst;
+			conn_src->end.codec = codec_conn_src;
+			return 0;
+		}
+	}
+
+	if (conn_dst->end.codecs_assigned)
+		conn_dst->end.codec = &conn_dst->end.codecs[0];
+	else
+		return -EINVAL;
+
+	if (conn_src->end.codecs_assigned)
+		conn_src->end.codec = &conn_src->end.codecs[0];
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+/* Check if the codec has a specific AMR mode (octet-aligned or bandwith-efficient) set. */
+bool mgcp_codec_amr_align_mode_is_indicated(const struct mgcp_rtp_codec *codec)
+{
+	if (!codec->fmtp[0]) {
+		/* Legacy */
+		return codec->param_present && codec->param.amr_octet_aligned_present;
+	}
+
+	/* Just check for presence, not the actual value. */
+	return osmo_sdp_fmtp_get_val(NULL, 0, codec->fmtp, OSMO_SDP_STR_AMR_OCTET_ALIGN);
+}
+
+/* Find the payload type number configured for a specific codec by SDP.
+ * For example, IuUP gets assigned a payload type number, and the endpoint needs to translate that to the number
+ * assigned to "AMR" on the other conn (by a=rtpmap:N).
+ * \param conn  The side of an endpoint to get the payload type number for (to translate the payload type number to).
+ * \param subtype_name  SDP codec name without parameters (e.g. "AMR").
+ * \param match_nr  Index for the match found, first being match_nr == 0. Iterate all matches by calling multiple times
+ *                  with incrementing match_nr.
+ * \return codec definition for that conn matching the subtype_name, or NULL if no such match_nr is found. */
+const struct mgcp_rtp_codec *mgcp_codec_pt_find_by_subtype_name(struct mgcp_conn_rtp *conn,
+								const char *subtype_name, unsigned int match_nr)
+{
+	int i;
+	for (i = 0; i < conn->end.codecs_assigned; i++) {
+		if (!strcmp(conn->end.codecs[i].subtype_name, subtype_name)) {
+			if (match_nr) {
+				match_nr--;
+				continue;
+			}
+			return &conn->end.codecs[i];
+		}
+	}
+	return NULL;
+}
+
+/*! Lookup a codec that is assigned to a connection by its payload type number.
+ *  \param[in] conn related rtp-connection.
+ *  \param[in] payload_type number of the codec to look up.
+ *  \returns pointer to codec struct on success, NULL on failure. */
+struct mgcp_rtp_codec *mgcp_codec_from_pt(struct mgcp_conn_rtp *conn, int payload_type)
+{
+	struct mgcp_rtp_end *rtp_end = &conn->end;
+	unsigned int codecs_assigned = rtp_end->codecs_assigned;
+	struct mgcp_rtp_codec *codec = NULL;
+	size_t i;
+
+	OSMO_ASSERT(codecs_assigned <= MGCP_MAX_CODECS);
+
+	for (i = 0; i < codecs_assigned; i++) {
+		if (payload_type == rtp_end->codecs[i].payload_type) {
+			codec = &rtp_end->codecs[i];
+			break;
+		}
+	}
+
+	return codec;
 }

src/libosmo-mgcp/mgcp_conn.c

@@ -21,17 +21,23 @@
  *
  */
 
+#include <stdatomic.h>
 #include <osmocom/mgcp/mgcp_conn.h>
-#include <osmocom/mgcp/mgcp_internal.h>
+#include <osmocom/mgcp/mgcp_network.h>
+#include <osmocom/mgcp/mgcp_protocol.h>
 #include <osmocom/mgcp/mgcp_common.h>
 #include <osmocom/mgcp/mgcp_endp.h>
+#include <osmocom/mgcp/mgcp_trunk.h>
 #include <osmocom/mgcp/mgcp_sdp.h>
 #include <osmocom/mgcp/mgcp_codec.h>
+#include <osmocom/mgcp/mgcp_iuup.h>
+
 #include <osmocom/gsm/gsm_utils.h>
 #include <osmocom/core/rate_ctr.h>
+#include <osmocom/core/timer.h>
 #include <ctype.h>
 
-const static struct rate_ctr_group_desc rate_ctr_group_desc = {
+static const struct rate_ctr_group_desc rate_ctr_group_desc = {
 	.group_name_prefix = "conn_rtp",
 	.group_description = "rtp connection statistics",
 	.class_id = 1,
@@ -74,55 +80,83 @@ static int mgcp_alloc_id(struct mgcp_endpoint *endp, char *id)
 		}
 	}
 
-	LOGP(DLMGCP, LOGL_ERROR, "endpoint:0x%x, unable to generate a unique connectionIdentifier\n",
-	     ENDPOINT_NUMBER(endp));
+	LOGPENDP(endp, DLMGCP, LOGL_ERROR, "unable to generate a unique connectionIdentifier\n");
 
 	return -1;
 }
 
 /* Initialize rtp connection struct with default values */
-static void mgcp_rtp_conn_init(struct mgcp_conn_rtp *conn_rtp, struct mgcp_conn *conn)
+static int mgcp_rtp_conn_init(struct mgcp_conn_rtp *conn_rtp, struct mgcp_conn *conn)
 {
 	struct mgcp_rtp_end *end = &conn_rtp->end;
 	/* FIXME: Each new rate counter group requires an unique index. At the
 	 * moment we generate this index using this counter, but perhaps there
 	 * is a more concious way to assign the indexes. */
-	static unsigned int rate_ctr_index = 0;
+	static atomic_uint rate_ctr_index = 0;
 
 	conn_rtp->type = MGCP_RTP_DEFAULT;
-	conn_rtp->osmux.allocated_cid = -1;
+
+	/* Osmux specific defaults, only used if conn is later on Osmux-enabled: */
+	conn_rtp->osmux.state = OSMUX_STATE_DISABLED;
+	conn_rtp->osmux.local_cid_allocated = false;
+	conn_rtp->osmux.local_cid = 0;
+	conn_rtp->osmux.remote_cid_present = false;
+	conn_rtp->osmux.remote_cid = 0;
 
 	/* backpointer to the generic part of the connection */
 	conn->u.rtp.conn = conn;
 
 	end->rtp.fd = -1;
 	end->rtcp.fd = -1;
-	end->rtp_port = end->rtcp_port = 0;
-	talloc_free(end->fmtp_extra);
-	end->fmtp_extra = NULL;
+	memset(&end->addr, 0, sizeof(end->addr));
+	end->rtcp_port = 0;
 
 	/* Set default values */
 	end->frames_per_packet = 0;	/* unknown */
 	end->packet_duration_ms = DEFAULT_RTP_AUDIO_PACKET_DURATION_MS;
-	end->output_enabled = 0;
+	end->output_enabled = false;
 	end->maximum_packet_time = -1;
 
-	conn_rtp->rate_ctr_group = rate_ctr_group_alloc(conn, &rate_ctr_group_desc, rate_ctr_index);
-	conn_rtp->state.in_stream.err_ts_ctr = &conn_rtp->rate_ctr_group->ctr[IN_STREAM_ERR_TSTMP_CTR];
-	conn_rtp->state.out_stream.err_ts_ctr = &conn_rtp->rate_ctr_group->ctr[OUT_STREAM_ERR_TSTMP_CTR];
-	rate_ctr_index++;
+	conn_rtp->ctrg = rate_ctr_group_alloc(conn, &rate_ctr_group_desc, rate_ctr_index++);
+	if (!conn_rtp->ctrg)
+		return -1;
+
+	conn_rtp->state.in_stream.err_ts_ctr = rate_ctr_group_get_ctr(conn_rtp->ctrg, IN_STREAM_ERR_TSTMP_CTR);
+	conn_rtp->state.out_stream.err_ts_ctr = rate_ctr_group_get_ctr(conn_rtp->ctrg, OUT_STREAM_ERR_TSTMP_CTR);
 
 	/* Make sure codec table is reset */
 	mgcp_codec_reset_all(conn_rtp);
+
+	return 0;
 }
 
 /* Cleanup rtp connection struct */
 static void mgcp_rtp_conn_cleanup(struct mgcp_conn_rtp *conn_rtp)
 {
-	osmux_disable_conn(conn_rtp);
-	osmux_release_cid(conn_rtp);
+	if (mgcp_conn_rtp_is_osmux(conn_rtp))
+		conn_osmux_disable(conn_rtp);
+	if (mgcp_conn_rtp_is_iuup(conn_rtp))
+		mgcp_conn_iuup_cleanup(conn_rtp);
 	mgcp_free_rtp_port(&conn_rtp->end);
-	rate_ctr_group_free(conn_rtp->rate_ctr_group);
+	rate_ctr_group_free(conn_rtp->ctrg);
+	mgcp_codec_reset_all(conn_rtp);
+}
+
+void mgcp_conn_watchdog_cb(void *data)
+{
+	struct mgcp_conn *conn = data;
+	LOGPCONN(conn, DLMGCP, LOGL_ERROR, "connection timed out!\n");
+	mgcp_conn_free(conn->endp, conn->id);
+}
+
+void mgcp_conn_watchdog_kick(struct mgcp_conn *conn)
+{
+	int timeout = conn->endp->trunk->cfg->conn_timeout;
+	if (!timeout)
+		return;
+
+	LOGPCONN(conn, DLMGCP, LOGL_DEBUG, "watchdog kicked\n");
+	osmo_timer_schedule(&conn->watchdog, timeout, 0);
 }
 
 /*! allocate a new connection list entry.
@@ -137,8 +171,8 @@ struct mgcp_conn *mgcp_conn_alloc(void *ctx, struct mgcp_endpoint *endp,
 	struct mgcp_conn *conn;
 	int rc;
 
-	/* Do not allow more then two connections */
-	if (llist_count(&endp->conns) >= endp->type->max_conns)
+	/* Do not allow more than the maximum number of connections */
+	if (endp->type->max_conns > 0 && llist_count(&endp->conns) >= endp->type->max_conns)
 		return NULL;
 
 	/* Create new connection and add it to the list */
@@ -158,7 +192,10 @@ struct mgcp_conn *mgcp_conn_alloc(void *ctx, struct mgcp_endpoint *endp,
 
 	switch (type) {
 	case MGCP_CONN_TYPE_RTP:
-		mgcp_rtp_conn_init(&conn->u.rtp, conn);
+		if (mgcp_rtp_conn_init(&conn->u.rtp, conn) < 0) {
+			talloc_free(conn);
+			return NULL;
+		}
 		break;
 	default:
 		/* NOTE: This should never be called with an
@@ -167,7 +204,10 @@ struct mgcp_conn *mgcp_conn_alloc(void *ctx, struct mgcp_endpoint *endp,
 		OSMO_ASSERT(false);
 	}
 
-	llist_add(&conn->entry, &endp->conns);
+	/* Initialize watchdog */
+	osmo_timer_setup(&conn->watchdog, mgcp_conn_watchdog_cb, conn);
+	mgcp_conn_watchdog_kick(conn);
+	mgcp_endp_add_conn(endp, conn);
 
 	return conn;
 }
@@ -224,12 +264,10 @@ struct mgcp_conn_rtp *mgcp_conn_get_rtp(struct mgcp_endpoint *endp,
 	return NULL;
 }
 
-static void
-aggregate_rtp_conn_stats(struct mgcp_trunk_config *trunk, struct mgcp_conn_rtp *conn_rtp)
+static void aggregate_rtp_conn_stats(struct mgcp_endpoint *endp, struct mgcp_conn_rtp *conn_rtp)
 {
-	struct rate_ctr_group *all_stats = trunk->all_rtp_conn_stats;
-	struct rate_ctr_group *conn_stats = conn_rtp->rate_ctr_group;
-	int i;
+	struct rate_ctr_group *all_stats = endp->trunk->ratectr.all_rtp_conn_stats;
+	struct rate_ctr_group *conn_stats = conn_rtp->ctrg;
 
 	if (all_stats == NULL || conn_stats == NULL)
 		return;
@@ -239,10 +277,13 @@ aggregate_rtp_conn_stats(struct mgcp_trunk_config *trunk, struct mgcp_conn_rtp *
 	 * All other counters in both counter groups correspond to each other. */
 	OSMO_ASSERT(conn_stats->desc->num_ctr + 1 == all_stats->desc->num_ctr);
 
-	for (i = 0; i < conn_stats->desc->num_ctr; i++)
-		rate_ctr_add(&all_stats->ctr[i], conn_stats->ctr[i].current);
+	/* all other counters are [now] updated in real-time */
+	rate_ctr_add(rate_ctr_group_get_ctr(all_stats, IN_STREAM_ERR_TSTMP_CTR),
+		     rate_ctr_group_get_ctr(conn_stats, IN_STREAM_ERR_TSTMP_CTR)->current);
+	rate_ctr_add(rate_ctr_group_get_ctr(all_stats, OUT_STREAM_ERR_TSTMP_CTR),
+		     rate_ctr_group_get_ctr(conn_stats, OUT_STREAM_ERR_TSTMP_CTR)->current);
 
-	rate_ctr_inc(&all_stats->ctr[RTP_NUM_CONNECTIONS]);
+	rate_ctr_inc(rate_ctr_group_get_ctr(all_stats, RTP_NUM_CONNECTIONS));
 }
 
 /*! free a connection by its ID.
@@ -256,15 +297,9 @@ void mgcp_conn_free(struct mgcp_endpoint *endp, const char *id)
 	if (!conn)
 		return;
 
-	/* Run endpoint cleanup action. By this we inform the endpoint about
-	 * the removal of the connection and allow it to clean up its inner
-	 * state accordingly */
-	if (endp->type->cleanup_cb)
-		endp->type->cleanup_cb(endp, conn);
-
 	switch (conn->type) {
 	case MGCP_CONN_TYPE_RTP:
-		aggregate_rtp_conn_stats(endp->tcfg, &conn->u.rtp);
+		aggregate_rtp_conn_stats(endp, &conn->u.rtp);
 		mgcp_rtp_conn_cleanup(&conn->u.rtp);
 		break;
 	default:
@@ -274,7 +309,9 @@ void mgcp_conn_free(struct mgcp_endpoint *endp, const char *id)
 		OSMO_ASSERT(false);
 	}
 
-	llist_del(&conn->entry);
+	osmo_timer_del(&conn->watchdog);
+	mgcp_endp_remove_conn(endp, conn);
+	/* WARN: endp may have be freed after call to mgcp_endp_remove_conn */
 	talloc_free(conn);
 }
 
@@ -296,15 +333,18 @@ void mgcp_conn_free_oldest(struct mgcp_endpoint *endp)
 
 /*! free all connections at once.
  *  \param[in] endp associated endpoint */
+#if defined(__has_attribute)
+#if __has_attribute(no_sanitize)
+__attribute__((no_sanitize("undefined"))) /* ubsan detects a misaligned load */
+#endif
+#endif
 void mgcp_conn_free_all(struct mgcp_endpoint *endp)
 {
 	struct mgcp_conn *conn;
-	struct mgcp_conn *conn_tmp;
 
-	/* Drop all items in the list */
-	llist_for_each_entry_safe(conn, conn_tmp, &endp->conns, entry) {
+	/* Drop all items in the list, might be consecutive! */
+	while ((conn = llist_first_entry_or_null(&endp->conns, struct mgcp_conn, entry)))
 		mgcp_conn_free(endp, conn->id);
-	}
 
 	return;
 }
@@ -315,29 +355,38 @@ void mgcp_conn_free_all(struct mgcp_endpoint *endp)
 char *mgcp_conn_dump(struct mgcp_conn *conn)
 {
 	static char str[sizeof(conn->name)+sizeof(conn->id)+256];
+	char ipbuf[INET6_ADDRSTRLEN];
+	struct osmo_strbuf sb = { .buf = str, .len = sizeof(str) };
 
-	if (!conn) {
-		snprintf(str, sizeof(str), "(null connection)");
-		return str;
-	}
+	if (!conn)
+		return "NULL";
 
 	switch (conn->type) {
 	case MGCP_CONN_TYPE_RTP:
-		/* Dump RTP connection */
-		snprintf(str, sizeof(str), "(%s/rtp, id:0x%s, ip:%s, "
-			 "rtp:%u rtcp:%u)",
-			 conn->name,
-			 conn->id,
-			 inet_ntoa(conn->u.rtp.end.addr),
-			 ntohs(conn->u.rtp.end.rtp_port),
-			 ntohs(conn->u.rtp.end.rtcp_port));
+		OSMO_STRBUF_PRINTF(sb, "(%s/%s C:%s r=%s:%u<->l=%s:%u",
+				   conn->name,
+				   mgcp_conn_rtp_type_name(conn->type),
+				   conn->id,
+				   osmo_sockaddr_ntop(&conn->u.rtp.end.addr.u.sa, ipbuf) ? : "NULL",
+				   osmo_sockaddr_port(&conn->u.rtp.end.addr.u.sa),
+				   conn->u.rtp.end.local_addr ? : "NULL",
+				   conn->u.rtp.end.local_port);
+
+		switch (conn->u.rtp.type) {
+		case MGCP_RTP_OSMUX:
+			OSMO_STRBUF_PRINTF(sb, " CID=%u", conn->u.rtp.osmux.local_cid);
+			break;
+		default:
+			break;
+		}
+
+		OSMO_STRBUF_PRINTF(sb, ")");
 		break;
 
 	default:
 		/* Should not happen, we should be able to dump
 		 * every possible connection type. */
-		snprintf(str, sizeof(str), "(unknown connection type)");
-		break;
+		return "(unknown connection type)";
 	}
 
 	return str;
@@ -364,3 +413,20 @@ struct mgcp_conn *mgcp_find_dst_conn(struct mgcp_conn *conn)
 
 	return NULL;
 }
+
+/*! get oldest connection in the list.
+ *  \param[in] endp associated endpoint */
+struct mgcp_conn *mgcp_conn_get_oldest(struct mgcp_endpoint *endp)
+{
+	if (llist_empty(&endp->conns))
+		return NULL;
+
+	return llist_last_entry(&endp->conns, struct mgcp_conn, entry);
+}
+
+const struct value_string mgcp_conn_rtp_type_names[] = {
+	{ MGCP_RTP_DEFAULT, "rtp" },
+	{ MGCP_RTP_OSMUX, "osmux" },
+	{ MGCP_RTP_IUUP, "iuup" },
+	{}
+};

src/libosmo-mgcp/mgcp_e1.c

@@ -0,0 +1,746 @@
+/* E1 traffic handling */
+
+/*
+ * (C) 2020 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Philipp Maier
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <inttypes.h>
+
+#include <osmocom/mgcp/mgcp_protocol.h>
+#include <osmocom/mgcp/mgcp.h>
+#include <osmocom/mgcp/mgcp_endp.h>
+#include <osmocom/mgcp/mgcp_trunk.h>
+#include <osmocom/mgcp/mgcp_conn.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/abis/e1_input.h>
+#include <osmocom/abis/abis.h>
+
+#include <osmocom/trau/trau_sync.h>
+#include <osmocom/trau/trau_frame.h>
+#include <osmocom/trau/trau_rtp.h>
+#include <osmocom/mgcp/mgcp_conn.h>
+#include <osmocom/netif/rtp.h>
+#include <osmocom/mgcp/debug.h>
+#include <osmocom/mgcp/mgcp_e1.h>
+#include <osmocom/codec/codec.h>
+
+#define DEBUG_BITS_MAX 80
+#define DEBUG_BYTES_MAX 40
+#define DEBUG_E1_TS 0
+#define E1_TS_BYTES 160
+#define E1_TRAU_BITS 320
+#define E1_TRAU_BITS_MSGB 2048
+
+static struct mgcp_config *cfg;
+
+static const struct e1inp_line_ops dummy_e1_line_ops = {
+	.sign_link_up = NULL,
+	.sign_link_down = NULL,
+	.sign_link = NULL,
+};
+
+/* EFR idle frame */
+static const ubit_t idle_tf_efr[] = { 0, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 1, 1, 0, 1, 0, 0, 0,
+				      0, 0, 0, 0, 1, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0, 0,
+				      1, 0, 0, 0, 0, 0, 1, 0,
+				      1, 1, 1, 1, 1, 1, 1, 1,
+};
+
+/* FR idle frame */
+static const ubit_t idle_tf_fr[] = { 0, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 1, 1, 1, 0, 0, 0, 0,
+				     0, 0, 0, 0, 1, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 0, 0,
+				     0, 0, 0, 0, 0, 0, 0, 0,
+				     1, 0, 0, 0, 0, 0, 1, 0,
+				     1, 1, 1, 1, 1, 1, 1, 1,
+};
+
+/* Idle speech frame, see also GSM 08.60, chapter 3.4 */
+static const ubit_t idle_tf_spch[] = { 0, 0, 0, 0, 0, 0, 0, 0,
+				       0, 0, 0, 0, 0, 0, 0, 0,
+				       1, 0, 1, 1, 1, 0, 0, 0,
+				       0, 0, 0, 0, 1, 0, 0, 0,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+				       1, 1, 1, 1, 1, 1, 1, 0,
+				       1, 1, 1, 1, 1, 1, 1, 1,
+};
+
+/* If the RTP transmission has dropouts for some reason the I.460 TX-Queue may
+ * run empty. In order to make sure that the TRAU frame transmission continues
+ * we generate idle TRAU frames here. */
+static void e1_i460_mux_empty_cb(struct osmo_i460_subchan *schan, void *user_data)
+{
+	struct mgcp_endpoint *endp = user_data;
+	struct rate_ctr_group *rate_ctrs = endp->trunk->ratectr.e1_stats;
+	struct msgb *msg = msgb_alloc_c(endp->trunk, E1_TRAU_BITS_MSGB, "E1-I.460-IDLE-TX-TRAU-frame");
+	uint8_t *ptr;
+	const uint8_t *ptr_ft;
+	enum osmo_trau_frame_type ft;
+
+	rate_ctr_inc(rate_ctr_group_get_ctr(rate_ctrs, E1_I460_TRAU_MUX_EMPTY_CTR));
+
+	/* Choose an appropiate idle frame type */
+	ft = endp->e1.trau_rtp_st->type;
+	switch (ft) {
+	case OSMO_TRAU16_FT_FR:
+		ptr_ft = idle_tf_fr;
+		break;
+	case OSMO_TRAU16_FT_EFR:
+		ptr_ft = idle_tf_efr;
+		break;
+	default:
+		/* FIXME: What about 8k subslots and AMR frames? */
+		ptr_ft = idle_tf_spch;
+	}
+
+	/* Put the replacement into a message buffer and enqueue it into the
+	 * I.460 multiplexer */
+	ptr = msgb_put(msg, E1_TRAU_BITS);
+	memcpy(ptr, ptr_ft, E1_TRAU_BITS);
+	LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-IDLE-TX: enquing %u trau frame bits: %s...\n", msgb_length(msg),
+		 osmo_ubit_dump(msgb_data(msg), msgb_length(msg) > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : msgb_length(msg)));
+	osmo_i460_mux_enqueue(endp->e1.schan, msg);
+}
+
+/* called by I.460 de-multiplexer; feed output of I.460 demux into TRAU frame sync */
+static void e1_i460_demux_bits_cb(struct osmo_i460_subchan *schan, void *user_data, const ubit_t *bits,
+				  unsigned int num_bits)
+{
+	struct mgcp_endpoint *endp = user_data;
+	LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: receiving %u bits from subslot: %s...\n", num_bits,
+		 osmo_ubit_dump(bits, num_bits > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : num_bits));
+
+	OSMO_ASSERT(endp->e1.trau_sync_fi);
+	osmo_trau_sync_rx_ubits(endp->e1.trau_sync_fi, bits, num_bits);
+}
+
+/* called for each synchronized TRAU frame received; decode frame + convert to RTP
+ * (the resulting frame will be prepended with an all-zero (12-byte) rtp header) */
+static void sync_frame_out_cb(void *user_data, const ubit_t *bits, unsigned int num_bits)
+{
+	unsigned int rtp_hdr_len = sizeof(struct rtp_hdr);
+	struct mgcp_endpoint *endp = user_data;
+	struct msgb *msg = msgb_alloc_c(endp->trunk, RTP_BUF_SIZE, "RTP-rx-from-E1");
+	struct rate_ctr_group *rate_ctrs = endp->trunk->ratectr.e1_stats;
+	struct mgcp_conn *conn_dst;
+	struct osmo_trau_frame fr;
+	int rc;
+
+	if (!bits || num_bits == 0)
+		goto skip;
+
+	LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: receiving %u TRAU frame bits from E1 subslot: %s...\n",
+		 num_bits, osmo_ubit_dump(bits, num_bits > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : num_bits));
+
+	/* Decode TRAU frame */
+	switch (endp->e1.scd.rate) {
+	case OSMO_I460_RATE_8k:
+		LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: decoding 8k trau frame...\n");
+		rc = osmo_trau_frame_decode_8k(&fr, bits, OSMO_TRAU_DIR_UL);
+		break;
+	case OSMO_I460_RATE_16k:
+		LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: decoding 16k trau frame...\n");
+		rc = osmo_trau_frame_decode_16k(&fr, bits, OSMO_TRAU_DIR_UL);
+		break;
+	default:
+		/* TRAU frames only exist in 8K or 16K subslots. */
+		OSMO_ASSERT(false);
+		break;
+	}
+	if (rc != 0) {
+		LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: unable to decode trau frame\n");
+		goto skip;
+	}
+
+	/* Check if the payload type is supported and what the expected lenth
+	 * of the RTP payload will be. */
+	LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: decoded trau frame type: %s\n",
+		 osmo_trau_frame_type_name(fr.type));
+
+	/* Convert decoded trau frame to RTP frame */
+	struct osmo_trau2rtp_state t2rs = {
+		.type = fr.type,
+	};
+	rc = osmo_trau2rtp(msgb_data(msg) + rtp_hdr_len, msg->data_len - rtp_hdr_len, &fr, &t2rs);
+	if (rc <= 0) {
+		LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: unable to convert trau frame to RTP audio\n");
+		goto skip;
+	}
+	msgb_put(msg, rtp_hdr_len + rc);
+	LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: encoded %u bytes of RTP audio: %s\n", rc,
+		 osmo_hexdump(msgb_data(msg) + rtp_hdr_len, msgb_length(msg) - rtp_hdr_len));
+
+	/* Forward RTP data to IP */
+	conn_dst = llist_first_entry(&endp->conns, struct mgcp_conn, entry);
+	if (!conn_dst) {
+		LOGPENDP(endp, DE1, LOGL_DEBUG,
+			 "E1-I.460-RX: unable to forward RTP audio data from E1: no connection to forward an incoming RTP packet to\n");
+		goto skip;
+	}
+	OSMO_ASSERT(conn_dst->type == MGCP_CONN_TYPE_RTP);
+
+	mgcp_send(endp, 1, NULL, msg, &conn_dst->u.rtp, &conn_dst->u.rtp);
+
+	msgb_free(msg);
+	return;
+skip:
+	rate_ctr_inc(rate_ctr_group_get_ctr(rate_ctrs, E1_I460_TRAU_RX_FAIL_CTR));
+	msgb_free(msg);
+	return;
+}
+
+/* handle outgoing E1 traffic */
+static void e1_send_ts_frame(struct e1inp_ts *ts, struct mgcp_trunk *trunk)
+{
+	struct msgb *msg = msgb_alloc_c(trunk, E1_TS_BYTES, "E1-TX-timeslot-bytes");
+	uint8_t *ptr;
+
+	/* Get E1 frame from I.460 multiplexer */
+	ptr = msgb_put(msg, E1_TS_BYTES);
+	osmo_i460_mux_out(&trunk->e1.i460_ts[ts->num - 1], ptr, E1_TS_BYTES);
+
+#if DEBUG_E1_TS == 1
+	LOGPTRUNK(trunk, DE1, LOGL_DEBUG, "E1-TX: (ts:%u) sending %u bytes: %s...\n", ts->num, msgb_length(msg),
+		  osmo_hexdump_nospc(msgb_data(msg),
+				     msgb_length(msg) > DEBUG_BYTES_MAX ? DEBUG_BYTES_MAX : msgb_length(msg)));
+#endif
+	/* Hand data over to the E1 stack */
+	msgb_enqueue(&ts->raw.tx_queue, msg);
+	return;
+}
+
+/* Callback function to handle incoming E1 traffic */
+static void e1_recv_cb(struct e1inp_ts *ts, struct msgb *msg)
+{
+	struct mgcp_trunk *trunk;
+
+	/* Find associated trunk */
+	trunk = mgcp_trunk_by_line_num(cfg, ts->line->num);
+	if (!trunk) {
+		LOGP(DE1, LOGL_ERROR, "E1-RX: unable to find a trunk for E1-line %u!\n", ts->line->num);
+		msgb_free(msg);
+		return;
+	}
+
+	/* Check if the incoming data looks sane */
+	if (msgb_length(msg) != E1_TS_BYTES) {
+		LOGPTRUNK(trunk, DE1, LOGL_NOTICE,
+			  "E1-RX: (ts:%u) expected length is %u, actual length is %u!\n", ts->num, E1_TS_BYTES,
+			  msgb_length(msg));
+	}
+#if DEBUG_E1_TS == 1
+	LOGPTRUNK(trunk, DE1, LOGL_DEBUG, "E1-RX: (ts:%u) receiving %u bytes: %s...\n", ts->num,
+		  msgb_length(msg), osmo_hexdump_nospc(msgb_data(msg),
+						       msgb_length(msg) >
+						       DEBUG_BYTES_MAX ? DEBUG_BYTES_MAX : msgb_length(msg)));
+#endif
+
+	/* Hand data over to the I.460 demultiplexer. */
+	osmo_i460_demux_in(&trunk->e1.i460_ts[ts->num - 1], msgb_data(msg), msgb_length(msg));
+
+	/* Trigger sending of pending E1 traffic */
+	e1_send_ts_frame(ts, trunk);
+
+	/* e1inp_rx_ts(), the caller of this callback does not free() msgb. */
+	msgb_free(msg);
+}
+
+static int e1_open(struct mgcp_trunk *trunk, uint8_t ts_nr)
+{
+	/*! One E1 timeslot may serve multiple I.460 subslots. The timeslot is opened as soon as an I.460 subslot is
+	 *  opened and will stay open until the last I.460 subslot is closed (see e1_close below). This function must
+	 *  be called any time a new I.460 subslot is opened in order to maintain constancy of the ts_usecount counter. */
+
+	struct e1inp_line *e1_line;
+	int rc;
+
+	OSMO_ASSERT(ts_nr > 0 || ts_nr < NUM_E1_TS);
+	cfg = trunk->cfg;
+
+	if (trunk->e1.ts_usecount[ts_nr - 1] > 0) {
+		LOGPTRUNK(trunk, DE1, LOGL_INFO, "E1 timeslot %u already set up and in use by %u subslot(s), using it as it is...\n",
+			  ts_nr, trunk->e1.ts_usecount[ts_nr - 1]);
+		trunk->e1.ts_usecount[ts_nr - 1]++;
+		return 0;
+	}
+
+	/* Find E1 line */
+	e1_line = e1inp_line_find(trunk->e1.vty_line_nr);
+	if (!e1_line) {
+		LOGPTRUNK(trunk, DE1, LOGL_ERROR, "no such E1 line %u - check VTY config!\n",
+			  trunk->e1.vty_line_nr);
+		return -EINVAL;
+	}
+	e1inp_line_bind_ops(e1_line, &dummy_e1_line_ops);
+
+	/* Configure E1 timeslot */
+	rc = e1inp_ts_config_raw(&e1_line->ts[ts_nr - 1], e1_line, e1_recv_cb);
+	if (rc < 0) {
+		LOGPTRUNK(trunk, DE1, LOGL_ERROR, "failed to put E1 timeslot %u in raw mode.\n", ts_nr);
+		return -EINVAL;
+	}
+	rc = e1inp_line_update(e1_line);
+	if (rc < 0) {
+		LOGPTRUNK(trunk, DE1, LOGL_ERROR, "failed to update E1 line %u.\n", ts_nr);
+		return -EINVAL;
+	}
+
+	LOGPTRUNK(trunk, DE1, LOGL_INFO, "E1 timeslot %u set up successfully.\n", ts_nr);
+	trunk->e1.ts_usecount[ts_nr - 1]++;
+	OSMO_ASSERT(trunk->e1.ts_usecount[ts_nr - 1] == 1);
+
+	return 0;
+}
+
+static int e1_close(struct mgcp_trunk *trunk, uint8_t ts_nr)
+{
+	/* See also comment above (e1_open). This function must be called any time an I.460 subslot is closed */
+
+	struct e1inp_line *e1_line;
+	int rc;
+
+	OSMO_ASSERT(ts_nr > 0 || ts_nr < NUM_E1_TS);
+	cfg = trunk->cfg;
+
+	if (trunk->e1.ts_usecount[ts_nr - 1] > 1) {
+		trunk->e1.ts_usecount[ts_nr - 1]--;
+		LOGPTRUNK(trunk, DE1, LOGL_INFO, "E1 timeslot %u still in use by %u other subslot(s), leaving it open...\n",
+			  ts_nr, trunk->e1.ts_usecount[ts_nr - 1]);
+		return 0;
+	} else if (trunk->e1.ts_usecount[ts_nr - 1] == 0) {
+		/* This should not be as it means we close the timeslot too often. */
+		LOGPTRUNK(trunk, DE1, LOGL_ERROR, "E1 timeslot %u already closed, leaving it as it is...\n", ts_nr);
+		return -EINVAL;
+	}
+
+	/* Find E1 line */
+	e1_line = e1inp_line_find(trunk->e1.vty_line_nr);
+	if (!e1_line) {
+		LOGPTRUNK(trunk, DE1, LOGL_ERROR, "no such E1 line %u - check VTY config!\n",
+			  trunk->e1.vty_line_nr);
+		return -EINVAL;
+	}
+
+	/* Release E1 timeslot */
+	rc = e1inp_ts_config_none(&e1_line->ts[ts_nr - 1], e1_line);
+	if (rc < 0) {
+		LOGPTRUNK(trunk, DE1, LOGL_ERROR, "failed to disable E1 timeslot %u.\n", ts_nr);
+		return -EINVAL;
+	}
+	rc = e1inp_line_update(e1_line);
+	if (rc < 0) {
+		LOGPTRUNK(trunk, DE1, LOGL_ERROR, "failed to update E1 line %u.\n", trunk->e1.vty_line_nr);
+		return -EINVAL;
+	}
+
+	LOGPTRUNK(trunk, DE1, LOGL_INFO, "E1 timeslot %u closed.\n", ts_nr);
+	trunk->e1.ts_usecount[ts_nr - 1]--;
+	OSMO_ASSERT(trunk->e1.ts_usecount[ts_nr - 1] == 0);
+
+	return 0;
+}
+
+/* Determine a suitable TRAU frame type for a given codec */
+static enum osmo_trau_frame_type determine_trau_fr_type(char *sdp_subtype_name, enum osmo_i460_rate i460_rate,
+							uint8_t amr_ft, struct mgcp_endpoint *endp)
+{
+	if (strcmp(sdp_subtype_name, "GSM") == 0)
+		return OSMO_TRAU16_FT_FR;
+	else if (strcmp(sdp_subtype_name, "GSM-EFR") == 0)
+		return OSMO_TRAU16_FT_EFR;
+	else if (strcmp(sdp_subtype_name, "GSM-HR-08") == 0)
+		return OSMO_TRAU16_FT_HR;
+	else if (strcmp(sdp_subtype_name, "AMR") == 0) {
+		if (i460_rate == OSMO_I460_RATE_8k) {
+			switch (amr_ft) {
+			case AMR_4_75:
+			case AMR_5_15:
+			case AMR_5_90:
+				return OSMO_TRAU8_AMR_LOW;
+			case AMR_6_70:
+				return OSMO_TRAU8_AMR_6k7;
+			case AMR_7_40:
+				return OSMO_TRAU8_AMR_7k4;
+			default:
+				LOGPENDP(endp, DE1, LOGL_ERROR,
+					 "E1-TRAU-TX: unsupported or illegal AMR frame type: %u\n", amr_ft);
+				return OSMO_TRAU_FT_NONE;
+			}
+		}
+		return OSMO_TRAU16_FT_AMR;
+	} else {
+		LOGPENDP(endp, DE1, LOGL_ERROR, "E1-TRAU-TX: unsupported or illegal codec subtype name: %s\n",
+			 sdp_subtype_name);
+		return OSMO_TRAU_FT_NONE;
+	}
+}
+
+/* Determine a suitable TRAU frame type for a given codec */
+static enum osmo_tray_sync_pat_id determine_trau_sync_pat(char *sdp_subtype_name, enum osmo_i460_rate i460_rate,
+							  uint8_t amr_ft, struct mgcp_endpoint *endp)
+{
+	if (strcmp(sdp_subtype_name, "GSM") == 0)
+		return OSMO_TRAU_SYNCP_16_FR_EFR;
+	else if (strcmp(sdp_subtype_name, "GSM-EFR") == 0)
+		return OSMO_TRAU_SYNCP_16_FR_EFR;
+	else if (strcmp(sdp_subtype_name, "GSM-HR-08") == 0)
+		return OSMO_TRAU_SYNCP_8_HR;
+	else if (strcmp(sdp_subtype_name, "AMR") == 0) {
+		if (i460_rate == OSMO_I460_RATE_8k) {
+			switch (amr_ft) {
+			case AMR_4_75:
+			case AMR_5_15:
+			case AMR_5_90:
+				return OSMO_TRAU_SYNCP_8_AMR_LOW;
+			case AMR_6_70:
+				return OSMO_TRAU_SYNCP_8_AMR_6K7;
+			case AMR_7_40:
+				return OSMO_TRAU_SYNCP_8_AMR_7K4;
+			default:
+				LOGPENDP(endp, DE1, LOGL_ERROR,
+					 "E1-TRAU-TX: unsupported or illegal AMR frame type: %u\n", amr_ft);
+				return OSMO_TRAU_SYNCP_16_FR_EFR;
+			}
+		}
+		return OSMO_TRAU_SYNCP_16_FR_EFR;
+	} else {
+		LOGPENDP(endp, DE1, LOGL_ERROR, "E1-TRAU-TX: unsupported or illegal codec subtype name: %s\n",
+			 sdp_subtype_name);
+		return OSMO_TRAU_SYNCP_16_FR_EFR;
+	}
+}
+
+/* Find out if a given TRAU frame type is AMR */
+static bool tf_type_is_amr(enum osmo_trau_frame_type ft)
+{
+
+	switch (ft) {
+	case OSMO_TRAU16_FT_AMR:
+	case OSMO_TRAU8_AMR_LOW:
+	case OSMO_TRAU8_AMR_6k7:
+	case OSMO_TRAU8_AMR_7k4:
+		return true;
+	default:
+		return false;
+	}
+}
+
+/*! Equip E1 endpoint with I.460 mux and E1 timeslot resources.
+ *  \param[in] endp endpoint to equip
+ *  \param[in] ts E1 timeslot number.
+ *  \param[in] ss E1 subslot number.
+ *  \param[in] offset E1 bit offset.
+ *  \returns 0 on success, -EINVAL on error. */
+int mgcp_e1_endp_equip(struct mgcp_endpoint *endp, uint8_t ts, uint8_t ss, uint8_t offs)
+{
+	int rc;
+	enum osmo_tray_sync_pat_id sync_pat_id = OSMO_TRAU_SYNCP_16_FR_EFR;
+
+	OSMO_ASSERT(ts != 0);
+	OSMO_ASSERT(ts != 0xFF);
+	OSMO_ASSERT(ss != 0xFF);
+	OSMO_ASSERT(offs != 0xFF);
+
+	memset(&endp->e1, 0, sizeof(endp->e1));
+
+	endp->e1.last_amr_ft = AMR_4_75;
+
+	/* Set up E1 line / timeslot */
+	rc = e1_open(endp->trunk, ts);
+	if (rc != 0)
+		return -EINVAL;
+
+	/* Set up I.460 mux */
+	switch (e1_rates[ss]) {
+	case 64:
+		endp->e1.scd.rate = OSMO_I460_RATE_64k;
+		endp->e1.scd.demux.num_bits = 160 * 8;
+		break;
+	case 32:
+		endp->e1.scd.rate = OSMO_I460_RATE_32k;
+		endp->e1.scd.demux.num_bits = 80 * 8;
+		break;
+	case 16:
+		endp->e1.scd.rate = OSMO_I460_RATE_16k;
+		endp->e1.scd.demux.num_bits = 40 * 8;
+		sync_pat_id = OSMO_TRAU_SYNCP_16_FR_EFR;
+		break;
+	case 8:
+		endp->e1.scd.rate = OSMO_I460_RATE_8k;
+		endp->e1.scd.demux.num_bits = 20 * 8;
+		sync_pat_id = OSMO_TRAU_SYNCP_8_HR;
+		break;
+	}
+	endp->e1.scd.bit_offset = offs;
+	endp->e1.scd.demux.out_cb_bits = e1_i460_demux_bits_cb;
+	endp->e1.scd.demux.out_cb_bytes = NULL;
+	endp->e1.scd.demux.user_data = endp;
+	endp->e1.scd.mux.in_cb_queue_empty = e1_i460_mux_empty_cb;
+	endp->e1.scd.mux.user_data = endp;
+
+	LOGPENDP(endp, DE1, LOGL_INFO, "adding I.460 subchannel: ts=%u, bit_offset=%u, rate=%uk, num_bits=%lu\n", ts,
+		 offs, e1_rates[ss], endp->e1.scd.demux.num_bits);
+	endp->e1.schan = osmo_i460_subchan_add(endp, &endp->trunk->e1.i460_ts[ts - 1], &endp->e1.scd);
+	if (!endp->e1.schan) {
+		LOGPENDP(endp, DE1, LOGL_ERROR, "adding I.460 subchannel: failed!\n");
+		return -EINVAL;
+	}
+
+	if (endp->e1.scd.rate == OSMO_I460_RATE_16k || endp->e1.scd.rate == OSMO_I460_RATE_8k) {
+		/* TRAU frames are only specified for 16k and 8k subslots. For all other subslot
+		 * types the concept of TRAU frames does not apply. However, at the moment this
+		 * is the only format we currently support in osmo-mgw */
+		endp->e1.trau_sync_fi = osmo_trau_sync_alloc(endp, "trau-sync", sync_frame_out_cb, sync_pat_id, endp);
+		if (!endp->e1.trau_sync_fi) {
+			LOGPENDP(endp, DE1, LOGL_ERROR, "adding I.460 TRAU frame sync: failed!\n");
+			return -EINVAL;
+		}
+		endp->e1.trau_rtp_st = talloc_zero(endp->e1.trau_sync_fi, struct osmo_trau2rtp_state);
+		endp->e1.trau_rtp_st->type = OSMO_TRAU_FT_NONE;
+	} else {
+		LOGPENDP(endp, DE1, LOGL_ERROR,
+			 "osmo-mgw currently only supports 16K and 8K subslots (TRAU frames)!\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*! Update E1 related parameters (codec and sync pattern).
+ *  \param[in] endp endpoint to update. */
+void mgcp_e1_endp_update(struct mgcp_endpoint *endp)
+{
+	struct mgcp_conn *conn;
+	struct mgcp_rtp_codec *codec;
+	enum osmo_tray_sync_pat_id sync_pat_id;
+
+	/* In order to determine the codec, find the oldest connection on
+	 * the endpoint and use its codec information. Normally on an E1
+	 * endpoint no more than one connection should exist. */
+	conn = mgcp_conn_get_oldest(endp);
+	OSMO_ASSERT(conn);
+	codec = conn->u.rtp.end.codec;
+	OSMO_ASSERT(codec);
+
+	/* Update codec information */
+	endp->e1.trau_rtp_st->type =
+	    determine_trau_fr_type(codec->subtype_name, endp->e1.scd.rate, endp->e1.last_amr_ft, endp);
+	endp->e1.last_codec = codec;
+
+	/* Update sync pattern */
+	sync_pat_id = determine_trau_sync_pat(codec->subtype_name, endp->e1.scd.rate, endp->e1.last_amr_ft, endp);
+	osmo_trau_sync_set_pat(endp->e1.trau_sync_fi, sync_pat_id);
+}
+
+/*! Remove E1 resources from endpoint
+ *  \param[in] endp endpoint to release.
+ *  \param[in] ts E1 timeslot number. */
+void mgcp_e1_endp_release(struct mgcp_endpoint *endp, uint8_t ts)
+{
+	/* Guard against multiple calls. In case we don't see a subchannel anymore we can safely assume that all work
+	 * is done. */
+	if (!(endp->e1.schan || endp->e1.trau_rtp_st || endp->e1.trau_sync_fi))
+		return;
+
+	LOGPENDP(endp, DE1, LOGL_DEBUG, "removing I.460 subchannel and sync...\n");
+
+	if (endp->e1.schan)
+		osmo_i460_subchan_del(endp->e1.schan);
+	if (endp->e1.trau_rtp_st)
+		talloc_free(endp->e1.trau_rtp_st);
+	if (endp->e1.trau_sync_fi)
+		osmo_fsm_inst_term(endp->e1.trau_sync_fi, OSMO_FSM_TERM_REGULAR, NULL);
+	memset(&endp->e1, 0, sizeof(endp->e1));
+
+	/* Close E1 timeslot */
+	e1_close(endp->trunk, ts);
+}
+
+/*! Accept RTP message buffer with RTP data and enqueue voice data for E1 transmit.
+ *  \param[in] endp related endpoint (does not take ownership).
+ *  \param[in] codec configuration.
+ *  \param[in] msg RTP message buffer (including RTP header).
+ *  \returns 0 on success, -1 on ERROR. */
+int mgcp_e1_send_rtp(struct mgcp_endpoint *endp, struct mgcp_rtp_codec *codec, struct msgb *msg)
+{
+	struct msgb *msg_tf = msgb_alloc_c(endp->trunk, E1_TRAU_BITS_MSGB, "E1-I.460-TX-TRAU-frame");
+	struct rate_ctr_group *rate_ctrs = endp->trunk->ratectr.e1_stats;
+	unsigned int rtp_hdr_len = sizeof(struct rtp_hdr);
+	struct osmo_trau_frame tf;
+	uint8_t amr_ft;
+	int rc;
+
+	/* Extract AMR frame type from AMR head (if AMR is used) */
+	if (tf_type_is_amr(endp->e1.trau_rtp_st->type))
+		amr_ft = (msgb_data(msg)[rtp_hdr_len + 1] >> 3) & 0xf;
+	else
+		amr_ft = 0xff;
+
+	/* Adapt TRAU frame type on codec changes */
+	OSMO_ASSERT(endp->e1.last_codec);
+	if (codec != endp->e1.last_codec || (amr_ft != 0xff && amr_ft != endp->e1.last_amr_ft)) {
+		endp->e1.trau_rtp_st->type =
+		    determine_trau_fr_type(codec->subtype_name, endp->e1.scd.rate, amr_ft, endp);
+		endp->e1.last_codec = codec;
+		endp->e1.last_amr_ft = amr_ft;
+	}
+	if (endp->e1.trau_rtp_st->type == OSMO_TRAU_FT_NONE)
+		goto skip;
+	LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: using trau frame type for encoding: %s\n",
+		 osmo_trau_frame_type_name(endp->e1.trau_rtp_st->type));
+
+	/* Convert from RTP to TRAU format */
+	msg->l2h = msgb_data(msg) + rtp_hdr_len;
+	LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: decoding %u bytes of RTP audio to TRAU format: %s\n",
+		 msgb_length(msg), osmo_hexdump(msgb_l2(msg), msgb_l2len(msg)));
+	memset(&tf, 0, sizeof(tf));
+	tf.dir = OSMO_TRAU_DIR_DL;
+	rc = osmo_rtp2trau(&tf, msgb_l2(msg), msgb_l2len(msg), endp->e1.trau_rtp_st);
+	if (rc < 0) {
+		LOGPENDP(endp, DE1, LOGL_DEBUG,
+			 "E1-I.460-TX: failed to decode from RTP payload format to TRAU format\n");
+		goto skip;
+	}
+	rc = osmo_trau_frame_encode(msgb_data(msg_tf), msg_tf->data_len, &tf);
+	if (rc < 0) {
+		LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: failed to encode TRAU frame\n");
+		goto skip;
+	}
+	msgb_put(msg_tf, rc);
+	LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: enquing %u trau frame bits: %s...\n", msgb_length(msg_tf),
+		 osmo_ubit_dump(msgb_data(msg_tf),
+				msgb_length(msg_tf) > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : msgb_length(msg_tf)));
+
+	/* Enqueue data to I.460 multiplexer */
+	OSMO_ASSERT(endp->e1.schan);
+	OSMO_ASSERT(endp->e1.trau_sync_fi);
+
+	osmo_i460_mux_enqueue(endp->e1.schan, msg_tf);
+	LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: %u bits of audio enqued for E1 tx\n", msgb_length(msg_tf));
+
+	return 0;
+skip:
+	rate_ctr_inc(rate_ctr_group_get_ctr(rate_ctrs, E1_I460_TRAU_TX_FAIL_CTR));
+	msgb_free(msg_tf);
+	return -1;
+}

src/libosmo-mgcp/mgcp_endp.c

@@ -1,7 +1,7 @@
 /* Endpoint types */
 
 /*
- * (C) 2017 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * (C) 2017-2020 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
  * All Rights Reserved
  *
  * Author: Philipp Maier
@@ -21,23 +21,645 @@
  *
  */
 
-#include <osmocom/mgcp/mgcp_internal.h>
+#include <osmocom/mgcp/mgcp.h>
+#include <osmocom/mgcp/mgcp_protocol.h>
+#include <osmocom/mgcp/mgcp_conn.h>
 #include <osmocom/mgcp/mgcp_endp.h>
+#include <osmocom/mgcp/mgcp_trunk.h>
+
+#include <osmocom/abis/e1_input.h>
+#include <osmocom/mgcp/mgcp_e1.h>
+#include <osmocom/core/stat_item.h>
+
+#define E1_RATE_MAX 64
+#define E1_OFFS_MAX 8
 
 /* Endpoint typeset definition */
 const struct mgcp_endpoint_typeset ep_typeset = {
 	/* Specify endpoint properties for RTP endpoint */
-	.rtp.max_conns = 2,
-	.rtp.dispatch_rtp_cb = mgcp_dispatch_rtp_bridge_cb,
-	.rtp.cleanup_cb = mgcp_cleanup_rtp_bridge_cb
+	.rtp = {
+		.dispatch_rtp_cb = mgcp_dispatch_rtp_bridge_cb,
+		.cleanup_cb = mgcp_cleanup_rtp_bridge_cb,
+	},
+	/* Specify endpoint properties for E1 endpoint */
+	.e1 = {
+		.max_conns = 1,
+		.dispatch_rtp_cb = mgcp_dispatch_e1_bridge_cb,
+		.cleanup_cb = mgcp_cleanup_e1_bridge_cb,
+	},
 };
 
+/* Generate virtual endpoint name from given parameters */
+static char *gen_virtual_epname(void *ctx, const char *domain,
+			       unsigned int index)
+{
+	return talloc_asprintf(ctx, "%s%x@%s",
+		 MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK, index, domain);
+}
+
+/* Generate E1 endpoint name from given numeric parameters */
+static char *gen_e1_epname(void *ctx, const char *domain, unsigned int trunk_nr,
+			   uint8_t ts_nr, uint8_t ss_nr)
+{
+	unsigned int rate;
+	unsigned int offset;
+
+	OSMO_ASSERT(ss_nr < sizeof(e1_rates));
+
+	rate = e1_rates[ss_nr];
+	offset = e1_offsets[ss_nr];
+
+	return talloc_asprintf(ctx, "%s%u/s-%u/su%u-%u@%s",
+			       MGCP_ENDPOINT_PREFIX_E1_TRUNK, trunk_nr, ts_nr,
+			       rate, offset, domain);
+}
+
+/*! allocate an endpoint and set default values.
+ *  \param[in] trunk configuration.
+ *  \param[in] name endpoint index.
+ *  \returns endpoint on success, NULL on failure. */
+struct mgcp_endpoint *mgcp_endp_alloc(struct mgcp_trunk *trunk,
+				      unsigned int index)
+{
+	struct mgcp_endpoint *endp;
+
+	endp = talloc_zero(trunk->endpoints, struct mgcp_endpoint);
+	if (!endp)
+		return NULL;
+
+	INIT_LLIST_HEAD(&endp->conns);
+	endp->trunk = trunk;
+
+	switch (trunk->trunk_type) {
+	case MGCP_TRUNK_VIRTUAL:
+		endp->type = &ep_typeset.rtp;
+		endp->name = gen_virtual_epname(endp, trunk->cfg->domain, index);
+		break;
+	case MGCP_TRUNK_E1:
+		endp->type = &ep_typeset.e1;
+		endp->name = gen_e1_epname(endp, trunk->cfg->domain,
+					   trunk->trunk_nr,
+					   index / MGCP_ENDP_E1_SUBSLOTS, index % MGCP_ENDP_E1_SUBSLOTS);
+		break;
+	default:
+		osmo_panic("Cannot allocate unimplemented trunk type %d! %s:%d\n",
+			   trunk->trunk_type, __FILE__, __LINE__);
+	}
+
+	return endp;
+}
+
+/* Check if the endpoint name contains the prefix (e.g. "rtpbridge/" or
+ * "ds/e1-") and write the epname without the prefix back to the memory
+ * pointed at by epname. (per trunk the prefix is the same for all endpoints,
+ * so no ambiguity is introduced) */
+static void chop_epname_prefix(char *epname, const struct mgcp_trunk *trunk)
+{
+	size_t prefix_len;
+	switch (trunk->trunk_type) {
+	case MGCP_TRUNK_VIRTUAL:
+		prefix_len = sizeof(MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK) - 1;
+		if (strncmp
+		    (epname, MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK,
+		     prefix_len) == 0)
+			memmove(epname, epname + prefix_len,
+				strlen(epname) - prefix_len + 1);
+		return;
+	case MGCP_TRUNK_E1:
+		prefix_len = sizeof(MGCP_ENDPOINT_PREFIX_E1_TRUNK) - 1;
+		if (strncmp
+		    (epname, MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK,
+		     prefix_len) == 0)
+			memmove(epname, epname + prefix_len,
+				strlen(epname) - prefix_len + 1);
+		return;
+	default:
+		OSMO_ASSERT(false);
+	}
+}
+
+/* Check if the endpoint name contains a suffix (e.g. "@mgw") and truncate
+ * epname by writing a '\0' char where the suffix starts. */
+static void chop_epname_suffix(char *epname, const struct mgcp_trunk *trunk)
+{
+	char *suffix_begin;
+
+	/* Endpoints on the virtual trunk may have a domain name that is
+	 * followed after an @ character, this can be chopped off. All
+	 * other supported trunk types do not have any suffixes that may
+	 * be chopped off */
+	if (trunk->trunk_type == MGCP_TRUNK_VIRTUAL) {
+		suffix_begin = strchr(epname, '@');
+		if (!suffix_begin)
+			return;
+		*suffix_begin = '\0';
+	}
+}
+
+ /*! Convert all characters in epname to lowercase and strip trunk prefix and
+ * endpoint name suffix (domain name) from epname. The result is written to
+ * to the memory pointed at by epname_stripped. The expected size of the
+ * result is either equal or lower then the length of the input string
+ * (epname)
+ *  \param[out] epname_stripped pointer to store the stripped ep name.
+ *  \param[in] epname endpoint name to lookup.
+ *  \param[in] trunk where the endpoint is located. */
+void mgcp_endp_strip_name(char *epname_stripped, const char *epname,
+			 const struct mgcp_trunk *trunk)
+{
+	osmo_str_tolower_buf(epname_stripped, MGCP_ENDPOINT_MAXLEN, epname);
+	chop_epname_prefix(epname_stripped, trunk);
+	chop_epname_suffix(epname_stripped, trunk);
+}
+
+/* Go through the trunk and find a random free (no active calls) endpoint,
+ * this function is called when a wildcarded request is carried out, which
+ * means that it is up to the MGW to choose a random free endpoint. */
+static struct mgcp_endpoint *find_free_endpoint(const struct mgcp_trunk *trunk)
+{
+	struct mgcp_endpoint *endp;
+	unsigned int i;
+
+	for (i = 0; i < trunk->number_endpoints; i++) {
+		endp = trunk->endpoints[i];
+		/* A free endpoint must not serve a call already and it must
+		 * be available. */
+		if (endp->callid == NULL && mgcp_endp_avail(endp))
+			return endp;
+	}
+
+	return NULL;
+}
+
+/*! Find an endpoint of a trunk specified by its name.
+ *  \param[in] epname endpoint name to check.
+ *  \param[in] trunk mgcp_trunk that might have this endpoint.
+ *  \returns NULL if no ep found, else endpoint. */
+struct mgcp_endpoint *mgcp_endp_find_specific(const char *epname,
+						    const struct mgcp_trunk *trunk)
+{
+	char epname_stripped[MGCP_ENDPOINT_MAXLEN];
+	char epname_stripped_endp[MGCP_ENDPOINT_MAXLEN];
+	struct mgcp_endpoint *endp;
+	unsigned int i;
+
+	/* Strip irrelevant information from the endpoint name */
+	mgcp_endp_strip_name(epname_stripped, epname, trunk);
+
+	for (i = 0; i < trunk->number_endpoints; i++) {
+		endp = trunk->endpoints[i];
+		mgcp_endp_strip_name(epname_stripped_endp, endp->name, trunk);
+		if (strcmp(epname_stripped_endp, epname_stripped) == 0)
+			return endp;
+	}
+
+	return NULL;
+}
+
+/*! Check if the given epname refers to a wildcarded request or to a specific
+ *  endpoint.
+ *  \param[in] epname endpoint name to check
+ *  \returns true if epname refers to wildcarded request, else false. */
+bool mgcp_endp_is_wildcarded(const char *epname)
+{
+	if (strstr(epname, "*"))
+		return true;
+
+	return false;
+}
+
+/*! Check if the given epname refers to a "null" endpoint.
+ *  \param[in] epname endpoint name to check
+ *  \returns true if epname refers to "null"" endpoint, else false. */
+bool mgcp_endp_is_null(const char *epname)
+{
+	if (strncasecmp(epname, "null@", 5) == 0)
+		return true;
+
+	return false;
+}
+
+/*! Find an endpoint by its name on a specified trunk.
+ *  \param[out] cause pointer to store cause code, can be NULL.
+ *  \param[in] epname endpoint name to lookup.
+ *  \param[in] trunk where the endpoint is located.
+ *  \returns endpoint or NULL if endpoint was not found. */
+struct mgcp_endpoint *mgcp_endp_by_name_trunk(int *cause, const char *epname,
+					      const struct mgcp_trunk *trunk)
+{
+	struct mgcp_endpoint *endp;
+
+	if (cause)
+		*cause = 0;
+
+	/* At the moment we only support a primitive ('*'-only) method of
+	 * wildcarded endpoint searches that picks the next free endpoint on
+	 * a trunk. */
+	if (mgcp_endp_is_wildcarded(epname)) {
+		endp = find_free_endpoint(trunk);
+		if (endp) {
+			LOGPENDP(endp, DLMGCP, LOGL_DEBUG,
+				 "(trunk:%d) found free endpoint: %s\n",
+				 trunk->trunk_nr, endp->name);
+			return endp;
+		}
+
+		LOGP(DLMGCP, LOGL_ERROR,
+		     "(trunk:%d) Not able to find a free endpoint\n",
+		     trunk->trunk_nr);
+		if (cause)
+			*cause = -403;
+		return NULL;
+	}
+
+	/* Find an endpoint by its name (if wildcarded request is not
+	 * applicable) */
+	endp = mgcp_endp_find_specific(epname, trunk);
+	if (endp) {
+		LOGPENDP(endp, DLMGCP, LOGL_DEBUG,
+			 "(trunk:%d) found endpoint: %s\n",
+			 trunk->trunk_nr, endp->name);
+		return endp;
+	}
+
+	LOGP(DLMGCP, LOGL_ERROR,
+	     "(trunk:%d) Not able to find specified endpoint: %s\n",
+	     trunk->trunk_nr, epname);
+	if (cause)
+		*cause = -500;
+
+	return NULL;
+}
+
+/*! Find an endpoint by its name, search at all trunks.
+ *  \param[out] cause, pointer to store cause code, can be NULL.
+ *  \param[in] epname, must contain trunk prefix.
+ *  \param[in] cfg, mgcp configuration (trunks).
+ *  \returns endpoint or NULL if endpoint was not found. */
+struct mgcp_endpoint *mgcp_endp_by_name(int *cause, const char *epname,
+					struct mgcp_config *cfg)
+{
+	struct mgcp_trunk *trunk;
+	struct mgcp_endpoint *endp;
+	char epname_lc[MGCP_ENDPOINT_MAXLEN];
+
+	osmo_str_tolower_buf(epname_lc, sizeof(epname_lc), epname);
+	epname = epname_lc;
+
+	if (cause)
+		*cause = -500;
+
+	/* Identify the trunk where the endpoint is located */
+	trunk = mgcp_trunk_by_name(cfg, epname);
+	if (!trunk)
+		return NULL;
+
+	/* Identify the endpoint on the trunk */
+        endp = mgcp_endp_by_name_trunk(cause, epname, trunk);
+	if (!endp) {
+		return NULL;
+	}
+
+	if (cause)
+		*cause = 0;
+	return endp;
+}
+
+/* Get the E1 timeslot number from a given E1 endpoint name
+ * (e.g. ds/e1-0/s-30/su16-4), returns 0xff on error. */
+static uint8_t e1_ts_nr_from_epname(const char *epname)
+{
+	char buf[MGCP_ENDPOINT_MAXLEN + 1];
+	char *save_ptr = NULL;
+	char *buf_ptr = buf;
+	char *token;
+	unsigned long int res = 0;
+
+	strncpy(buf, epname, MGCP_ENDPOINT_MAXLEN);
+
+	while (1) {
+		token = strtok_r(buf_ptr, "/", &save_ptr);
+		buf_ptr = NULL;
+		if (!token)
+			break;
+		if (strncmp(token, "s-", 2) == 0) {
+			errno = 0;
+			res = strtoul(token + 2, NULL, 10);
+			if (errno == ERANGE || res > NUM_E1_TS)
+				return 0xff;
+			return (uint8_t) res;
+		}
+	}
+
+	return 0xff;
+}
+
+/* Get the E1 timeslot number from a given E1 endpoint name
+ * (e.g. ds/e1-0/s-30/su16-4), returns 0xff on error. */
+static uint8_t e1_rate_from_epname(const char *epname)
+{
+	char buf[MGCP_ENDPOINT_MAXLEN + 1];
+	char *save_ptr = NULL;
+	char *buf_ptr = buf;
+	char *token;
+	unsigned long int res = 0;
+	unsigned int i;
+
+	strncpy(buf, epname, MGCP_ENDPOINT_MAXLEN);
+
+	while (1) {
+		token = strtok_r(buf_ptr, "/", &save_ptr);
+		buf_ptr = NULL;
+		if (!token)
+			break;
+		if (strncmp(token, "su", 2) == 0) {
+			errno = 0;
+			res = strtoul(token + 2, NULL, 10);
+			if (errno == ERANGE || res > E1_RATE_MAX)
+				return 0xff;
+			/* Make sure the rate is a valid rate */
+			for (i = 0; i < sizeof(e1_rates); i++) {
+				if (res == e1_rates[i])
+					return (uint8_t) res;
+			}
+			return 0xff;
+		}
+	}
+
+	return 0xff;
+}
+
+/* Get the E1 bitstream offset from a given E1 endpoint name
+ * (e.g. ds/e1-0/s-30/su16-4), returns 0xff on error. */
+static uint8_t e1_offs_from_epname(const char *epname)
+{
+	char buf[MGCP_ENDPOINT_MAXLEN + 1];
+	char *save_ptr = NULL;
+	char *buf_ptr = buf;
+	char *token;
+	unsigned long int res = 0;
+
+	strncpy(buf, epname, MGCP_ENDPOINT_MAXLEN);
+
+	while (1) {
+		token = strtok_r(buf_ptr, "/", &save_ptr);
+		buf_ptr = NULL;
+		if (!token)
+			break;
+		if (strncmp(token, "su", 2) == 0) {
+			token = strstr(token, "-");
+			if (!token)
+				return 0xff;
+			token += 1;
+			errno = 0;
+			res = strtoul(token, NULL, 10);
+			if (errno == ERANGE || res > E1_OFFS_MAX)
+				return 0xff;
+			return (uint8_t) res;
+		}
+	}
+
+	return 0xff;
+}
+
+/* Get the E1 subslot number (internal) from a given E1 endpoint name
+ * (e.g. ds/e1-0/s-30/su16-4), returns 0xff on error. */
+static uint8_t e1_ss_nr_from_epname(const char *epname)
+{
+	uint8_t rate;
+	uint8_t offs;
+	unsigned int i;
+
+	rate = e1_rate_from_epname(epname);
+	offs = e1_offs_from_epname(epname);
+
+	osmo_static_assert(sizeof(e1_rates) == sizeof(e1_offsets), e1_rates_e1_offsets_size);
+
+	for (i = 0; i < sizeof(e1_rates); i++) {
+		if ((e1_rates[i] == rate) && (e1_offsets[i] == offs))
+			return i;
+	}
+
+	return 0xff;
+}
+
+/* Check if the selected E1 endpoint is avalable, which means that none of
+ * the overlapping endpoints are currently serving a call. (if the system
+ * is properly configured such a situation should never ocurr!) */
+static bool endp_avail_e1(struct mgcp_endpoint *endp)
+{
+	/* The following map shows the overlapping of the subslots and their
+	 * respective rates. The numbers on the right running from top to bottom
+	 * are the bit offsets in the whole 64k timeslot. The numbers inside the
+	 * boxes symbolize the internal subslot number (array index) and the
+	 * rate in the form: i:r where i is the subslot number and r the
+	 * respective rate.
+	 *
+	 * +--------+--------+--------+--------+ 0
+	 * |        |        |        |  7:8k  |
+	 * |        |        + 3:16k  +--------+ 1
+	 * |        |        |        |  8:8k  |
+	 * |        | 1:32k  +--------+--------+ 2
+	 * |        |        |        |  9:8k  |
+	 * |        |        + 4:16k  +--------+ 3
+	 * |        |        |        | 10:8k  |
+	 * | 0:64k  +--------+--------+--------+ 4
+	 * |        |        |        | 11:8k  |
+	 * |        |        + 5:16k  +--------+ 5
+	 * |        |        |        | 12:8k  |
+	 * |        | 2:32k  +--------+--------+ 6
+	 * |        |        |        | 13:8k  |
+	 * |        |        + 6:16k  +--------+ 7
+	 * |        |        |        | 14:8k  |
+	 * +--------+--------+--------+--------+ 8
+	 *
+	 * The following array contains tables with the subslot numbers that must be
+	 * unused for each subslot. During this test we do not have to check the
+	 * endpoint we need to verify, only the overlaps need to be checked. This is
+	 * also the reason why the related subslot number is missing from each each
+	 * line. */
+	const int8_t interlock_tab[MGCP_ENDP_E1_SUBSLOTS][15] = {
+		{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, -1 },
+		{ 0, 3, 4, 7, 8, 9, 10, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 5, 6, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 1, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 1, 9, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 2, 11, 12, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 2, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 1, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 1, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 1, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 1, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 2, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 2, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 2, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+		{ 0, 2, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } };
+
+	const int8_t *interlock;
+	unsigned int i;
+	uint8_t ts_nr = 0;
+	uint8_t ss_nr = 0;
+	char *epname_check;
+	struct mgcp_endpoint *endp_check;
+	bool available = true;
+
+	/* This function must only be used with E1 type endpoints! */
+	OSMO_ASSERT(endp->trunk->trunk_type == MGCP_TRUNK_E1);
+
+	ts_nr = e1_ts_nr_from_epname(endp->name);
+	ss_nr = e1_ss_nr_from_epname(endp->name);
+	if (ts_nr == 0xff || ss_nr == 0xff) {
+		LOGPENDP(endp, DLMGCP, LOGL_ERROR,
+			 "cannot check endpoint availability, endpoint name not parseable!\n");
+		return false;
+	}
+
+	interlock = interlock_tab[ss_nr];
+
+	for (i = 0; i < sizeof(interlock_tab[0]); i++) {
+		/* Detect row end */
+		if (interlock[i] == -1)
+			break;
+
+		/* Pick overlapping endpoint to check */
+		epname_check = gen_e1_epname(endp, endp->trunk->cfg->domain,
+					     endp->trunk->trunk_nr, ts_nr,
+					     interlock[i]);
+		endp_check = mgcp_endp_find_specific(epname_check, endp->trunk);
+		if (!endp_check) {
+			LOGPENDP(endp, DLMGCP, LOGL_ERROR,
+				 "cannot check endpoint availability, overlapping endpoint:%s not found!\n",
+				 epname_check);
+			talloc_free(epname_check);
+			continue;
+		}
+		talloc_free(epname_check);
+
+		/* Check if overlapping endpoint currently serves another call
+		 * (This is an exceptional situation, that should not occur
+		 * in a properly configured environment!) */
+		if (endp_check->callid) {
+			LOGPENDP(endp, DLMGCP, LOGL_ERROR,
+				 "endpoint unavailable - overlapping endpoint:%s already serves a call!\n",
+				 endp_check->name);
+			available = false;
+		}
+	}
+
+	return available;
+}
+
+/*! check if an endpoint is available for any kind of operation.
+ *  \param[in] endp endpoint to check.
+ *  \returns true if endpoint is avalable, false it is blocked for any reason. */
+bool mgcp_endp_avail(struct mgcp_endpoint *endp)
+{
+	switch (endp->trunk->trunk_type) {
+	case MGCP_TRUNK_VIRTUAL:
+		/* There are no obstacles that may render a virtual trunk
+		 * endpoint unusable, so virtual trunk endpoints are always
+		 * available */
+		return true;
+	case MGCP_TRUNK_E1:
+		return endp_avail_e1(endp);
+	default:
+		OSMO_ASSERT(false);
+	}
+
+	return false;
+}
+
+/*! claim endpoint, sets callid and activates endpoint, should be called at the
+ *  beginning of the CRCX procedure when it is clear that a new call should be
+ *  created.
+ *  \param[in] endp endpoint to claim.
+ *  \param[in] callid that is assingned to this endpoint. */
+int mgcp_endp_claim(struct mgcp_endpoint *endp, const char *callid)
+{
+	int rc = 0;
+	uint8_t ts;
+	uint8_t ss;
+	uint8_t offs;
+
+	/* TODO: Make this function more intelligent, it should run the
+	 * call id checks we currently have in protocol.c directly here. */
+
+	/* Set the callid, creation of another connection will only be possible
+	 * when the callid matches up. (Connections are distinguished by their
+	 * connection ids) */
+	endp->callid = talloc_strdup(endp, callid);
+	OSMO_ASSERT(endp->callid);
+	osmo_stat_item_inc(osmo_stat_item_group_get_item(endp->trunk->stats.common,
+							 TRUNK_STAT_ENDPOINTS_USED), 1);
+
+	/* Allocate resources */
+	switch (endp->trunk->trunk_type) {
+	case MGCP_TRUNK_VIRTUAL:
+		/* No additional initaliziation required here, virtual
+		 * endpoints will open/close network sockets themselves
+		 * on demand. */
+		break;
+	case MGCP_TRUNK_E1:
+		ts = e1_ts_nr_from_epname(endp->name);
+		ss = e1_ss_nr_from_epname(endp->name);
+		offs = e1_offs_from_epname(endp->name);
+		OSMO_ASSERT(ts != 0xFF);
+		OSMO_ASSERT(ts != 0);
+		OSMO_ASSERT(ss != 0xFF);
+		OSMO_ASSERT(offs != 0xFF);
+		rc = mgcp_e1_endp_equip(endp, ts, ss, offs);
+		break;
+	default:
+		OSMO_ASSERT(false);
+	}
+
+	/* Make sure the endpoint is released when claiming the endpoint fails. */
+	if (rc < 0)
+		mgcp_endp_release(endp);
+
+	return rc;
+}
+
+/*! update endpoint, updates internal endpoint specific data, should be
+ *  after when MDCX or CRCX has been executed successuflly.
+ *  \param[in] endp endpoint to update. */
+void mgcp_endp_update(struct mgcp_endpoint *endp)
+{
+	/* Allocate resources */
+	switch (endp->trunk->trunk_type) {
+	case MGCP_TRUNK_VIRTUAL:
+		/* No updating initaliziation required for virtual endpoints. */
+		break;
+	case MGCP_TRUNK_E1:
+		mgcp_e1_endp_update(endp);
+		break;
+	default:
+		OSMO_ASSERT(false);
+	}
+}
+
+void mgcp_endp_add_conn(struct mgcp_endpoint *endp, struct mgcp_conn *conn)
+{
+	llist_add(&conn->entry, &endp->conns);
+}
+
+void mgcp_endp_remove_conn(struct mgcp_endpoint *endp, struct mgcp_conn *conn)
+{
+	/* Run endpoint cleanup action. By this we inform the endpoint about
+	 * the removal of the connection and allow it to clean up its inner
+	 * state accordingly */
+	if (endp->type->cleanup_cb)
+		endp->type->cleanup_cb(endp, conn);
+	llist_del(&conn->entry);
+	if (llist_empty(&endp->conns))
+		mgcp_endp_release(endp);
+}
+
 /*! release endpoint, all open connections are closed.
  *  \param[in] endp endpoint to release */
 void mgcp_endp_release(struct mgcp_endpoint *endp)
 {
-	LOGP(DLMGCP, LOGL_DEBUG, "Releasing endpoint:0x%x\n",
-	     ENDPOINT_NUMBER(endp));
+	LOGPENDP(endp, DLMGCP, LOGL_DEBUG, "Releasing endpoint\n");
 
 	/* Normally this function should only be called when
 	 * all connections have been removed already. In case
@@ -45,6 +667,12 @@ void mgcp_endp_release(struct mgcp_endpoint *endp)
 	 * RSIP is executed), free them all at once. */
 	mgcp_conn_free_all(endp);
 
+	/* We must only decrement the stat item when the endpoint as actually
+	 * claimed. An endpoint is claimed when a call-id is set */
+	if (endp->callid)
+		osmo_stat_item_dec(osmo_stat_item_group_get_item(endp->trunk->stats.common,
+								 TRUNK_STAT_ENDPOINTS_USED), 1);
+
 	/* Reset endpoint parameters and states */
 	talloc_free(endp->callid);
 	endp->callid = NULL;
@@ -52,5 +680,10 @@ void mgcp_endp_release(struct mgcp_endpoint *endp)
 	endp->local_options.string = NULL;
 	talloc_free(endp->local_options.codec);
 	endp->local_options.codec = NULL;
-	endp->wildcarded_req = false;
+
+	if (endp->trunk->trunk_type == MGCP_TRUNK_E1) {
+		uint8_t ts = e1_ts_nr_from_epname(endp->name);
+		mgcp_e1_endp_release(endp, ts);
+	}
 }
+

src/libosmo-mgcp/mgcp_iuup.c

@@ -0,0 +1,753 @@
+/*
+ * (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All rights not specifically granted under this license are reserved.
+ *
+ * Author: Pau Espin Pedrol
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by the
+ * Free Software Foundation; either version 3 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <stdint.h>
+
+#include <osmocom/core/byteswap.h>
+
+#include <osmocom/gsm/iuup.h>
+
+#include <osmocom/netif/rtp.h>
+#include <osmocom/netif/amr.h>
+
+#include <osmocom/mgcp/mgcp_conn.h>
+#include <osmocom/mgcp/mgcp_iuup.h>
+#include <osmocom/mgcp/mgcp_endp.h>
+#include <osmocom/mgcp/mgcp_codec.h>
+#include <osmocom/mgcp/mgcp_network.h>
+#include <osmocom/mgcp/debug.h>
+
+#define MGW_IUUP_MSGB_SIZE 4096
+
+static const struct osmo_iuup_rnl_config def_configure_req = {
+	.transparent = false,
+	.active = true,
+	.supported_versions_mask = 0x0003,
+	.num_rfci = 0,
+	.num_subflows = 0,
+	.IPTIs_present = false,
+	.t_init = { .t_ms = IUUP_TIMER_INIT_T_DEFAULT, .n_max = IUUP_TIMER_INIT_N_DEFAULT },
+	.t_ta = { .t_ms = IUUP_TIMER_TA_T_DEFAULT, .n_max = IUUP_TIMER_TA_N_DEFAULT },
+	.t_rc = { .t_ms = IUUP_TIMER_RC_T_DEFAULT, .n_max = IUUP_TIMER_RC_N_DEFAULT },
+};
+
+/* Find a destination connection. */
+static struct mgcp_conn *_find_dst_conn(struct mgcp_conn *conn)
+{
+	/* NOTE: This code path runs every time an RTP packet is received. The
+	 * function mgcp_find_dst_conn() we use to determine the detination
+	 * connection will iterate the connection list inside the endpoint.
+	 * Since list iterations are quite costly, we will figure out the
+	 * destination only once and use the optional private data pointer of
+	 * the connection to cache the destination connection pointer. */
+
+	struct mgcp_conn *conn_dst;
+	if (!conn->priv) {
+		conn_dst = mgcp_find_dst_conn(conn);
+		conn->priv = conn_dst;
+	} else {
+		conn_dst = (struct mgcp_conn *)conn->priv;
+	}
+	return conn_dst;
+}
+
+/* Find RFCI containing all 0 sizes, -1 if not found. irp is an Initialization.ind prim */
+static int _find_rfci_no_data(struct osmo_iuup_rnl_prim *irp)
+{
+	int i;
+	uint8_t rfci_cnt = 0;
+	/* Find RFCI containing NO_DATA: */
+	for (i = 0; i < ARRAY_SIZE(irp->u.status.u.initialization.rfci); i++) {
+		struct osmo_iuup_rfci *rfci = &irp->u.status.u.initialization.rfci[i];
+		int j;
+		bool is_no_data;
+		if (!rfci->used)
+			continue;
+		rfci_cnt++;
+
+		is_no_data = true;
+		for (j = 0; j < irp->u.status.u.initialization.num_subflows; j++) {
+			if (rfci->subflow_sizes[j]) {
+				is_no_data = false;
+				break;
+			}
+		}
+		if (is_no_data)
+			return rfci->id;
+
+		/* early loop termination: */
+		if (rfci_cnt == irp->u.status.u.initialization.num_subflows)
+			break;
+	}
+	return -1;
+}
+
+/* Lookup RFCI to use for specific AMR codec type. -1 if none found */
+static int8_t _conn_iuup_amr_ft_2_rfci(struct mgcp_conn_rtp *conn_rtp, uint8_t ft)
+{
+	int8_t i;
+	uint8_t rfci_cnt = 0;
+	unsigned match_bytes = (unsigned)osmo_amr_bytes(ft);
+	struct osmo_iuup_rnl_prim *irp = conn_rtp->iuup.init_ind;
+	if (!irp) {
+		/* No IuUP Initialization has occured on the IuUP side yet. Return error and drop the RTP data, until
+		 * the IuUP Initialization has configured the link. */
+		return -1;
+	}
+
+	/* TODO: cache this somehow */
+	for (i = 0; i < ARRAY_SIZE(irp->u.status.u.initialization.rfci); i++) {
+		struct osmo_iuup_rfci *rfci = &irp->u.status.u.initialization.rfci[i];
+		int j;
+		unsigned num_bits;
+		if (!rfci->used)
+			continue;
+		rfci_cnt++;
+
+		num_bits = 0;
+		for (j = 0; j < irp->u.status.u.initialization.num_subflows; j++)
+			num_bits += rfci->subflow_sizes[j];
+		if (match_bytes == (num_bits + 7)/8)
+			return rfci->id;
+
+		/* early loop termination: */
+		if (rfci_cnt == irp->u.status.u.initialization.num_subflows)
+			break;
+	}
+	return -1;
+}
+
+/* Helper function to configure IuUP layer FSM as Init-Passive, based on default config */
+static int _conn_iuup_configure_as_passive(struct mgcp_conn_rtp *conn_rtp)
+{
+	struct osmo_iuup_rnl_prim *irp;
+	int rc;
+
+	conn_rtp->iuup.active_init = false;
+
+	/* Tx CONFIG.req */
+	irp = osmo_iuup_rnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_RNL_CONFIG, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE);
+	irp->u.config = def_configure_req;
+	irp->u.config.active = conn_rtp->iuup.active_init;
+	if ((rc = osmo_iuup_rnl_prim_down(conn_rtp->iuup.iui, irp)) == 0)
+		conn_rtp->iuup.configured = true;
+	else
+		LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed configuring IuUP layer\n");
+	return rc;
+}
+
+/* Helper function to configure IuUP layer FSM as Init-Active, based on received
+ * RNL Status-Init primitive from the sister IuUP connection we will bridge to. */
+static int _conn_iuup_configure_as_active(struct mgcp_conn_rtp *conn_rtp, struct osmo_iuup_rnl_prim *init_ind)
+{
+	struct osmo_iuup_rnl_prim *irp = init_ind;
+	struct osmo_iuup_rnl_prim *irp2;
+	struct msgb *msg;
+	bool prev_output_enabled;
+	int rc;
+
+	conn_rtp->iuup.active_init = true;
+
+	/* Find RFCI containing NO_DATA: */
+	conn_rtp->iuup.rfci_id_no_data = _find_rfci_no_data(init_ind);
+
+	/* Copy over the rfci_id_no_data, since we reuse the same subflow set: */
+	msg = msgb_copy_c(conn_rtp->conn, irp->oph.msg, "iuup-init-copy");
+	conn_rtp->iuup.init_ind = (struct osmo_iuup_rnl_prim *)msgb_data(msg);
+	conn_rtp->iuup.init_ind->oph.msg = msg;
+
+	/* Tx CONFIG.req */
+	irp2 = osmo_iuup_rnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_RNL_CONFIG, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE);
+	irp2->u.config.transparent = false;
+	irp2->u.config.active = conn_rtp->iuup.active_init;
+	irp2->u.config.data_pdu_type = irp->u.status.u.initialization.data_pdu_type;
+	irp2->u.config.supported_versions_mask = def_configure_req.supported_versions_mask;
+	irp2->u.config.num_rfci = irp->u.status.u.initialization.num_rfci;
+	irp2->u.config.num_subflows = irp->u.status.u.initialization.num_subflows;
+	irp2->u.config.IPTIs_present = irp->u.status.u.initialization.IPTIs_present;
+	memcpy(irp2->u.config.rfci, irp->u.status.u.initialization.rfci, sizeof(irp2->u.config.rfci));
+	irp2->u.config.t_init = def_configure_req.t_init;
+	irp2->u.config.t_ta = def_configure_req.t_ta;
+	irp2->u.config.t_rc = def_configure_req.t_rc;
+
+	/* We need to force allowance of RTP containing Init-ACK back: */
+	prev_output_enabled = conn_rtp->end.output_enabled;
+	conn_rtp->end.output_enabled = true;
+
+	if ((rc = osmo_iuup_rnl_prim_down(conn_rtp->iuup.iui, irp2)) == 0)
+		conn_rtp->iuup.configured = true;
+	else
+		LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed configuring IuUP layer\n");
+
+	conn_rtp->end.output_enabled = prev_output_enabled;
+	return rc;
+}
+
+/* Helper function to push an RTP+IuUP pkt up to the IuUP layer FSM through the
+ * TNL primitive interface. */
+static int _conn_iuup_rtp_pl_up(struct mgcp_conn_rtp *conn_rtp, struct msgb *msg)
+{
+	/* Send RTP payload (IuUP) up the stack: */
+	struct osmo_iuup_tnl_prim *itp;
+	int rc;
+
+	msg->l2h = msgb_data(msg) + sizeof(struct rtp_hdr);
+
+	itp = osmo_iuup_tnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_TNL_UNITDATA, PRIM_OP_INDICATION, MGW_IUUP_MSGB_SIZE);
+	itp->oph.msg->l2h = msgb_put(itp->oph.msg, msgb_l2len(msg));
+	memcpy(itp->oph.msg->l2h, msgb_l2(msg), msgb_l2len(msg));
+	if ((rc = osmo_iuup_tnl_prim_up(conn_rtp->iuup.iui, itp)) != 0) {
+		LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed passing IuUP-Init to IuUP layer\n");
+	}
+	return rc;
+}
+
+static int check_rtp_iuup(const struct mgcp_conn_rtp *conn_rtp, struct msgb *msg)
+{
+	size_t min_size = sizeof(struct rtp_hdr);
+	/* Check there's at least 2 bytes of RTP payload (IuUP header). This is
+	 ** mainly to avoid 0-byte payload copy cases */
+	if (msgb_length(msg) < sizeof(struct rtp_hdr) + 2) {
+		LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "RTP-IuUP packet too short (%u < %zu)\n",
+			     msgb_length(msg), min_size);
+		return -1;
+	}
+	return 0;
+}
+
+/* Bridge received IuUP packet in conn_rtp_src to conn_rtp_dst, an IuUP sister
+ * conn in the endpoint. The function takes ownsership of the irp */
+static int bridge_iuup_to_iuup_peer(struct mgcp_conn_rtp *conn_rtp_src, struct mgcp_conn_rtp *conn_rtp_dst, struct osmo_iuup_rnl_prim *irp)
+{
+	int rc;
+
+	/* If we are not configured and we received bridged data, it means
+	 * conn_rtp_src is already configured and INITed, and we can infer
+	 * conn_rtp_src is Init-passive (RNC side), so conn_rtp_dst needs to be
+	 * configured as INIT-active: */
+	if (!conn_rtp_dst->iuup.configured) {
+		OSMO_ASSERT(conn_rtp_src->iuup.init_ind);
+		rc = _conn_iuup_configure_as_active(conn_rtp_dst, conn_rtp_src->iuup.init_ind);
+		if (rc < 0) {
+			msgb_free(irp->oph.msg);
+			return rc;
+		}
+	}
+
+	/* We simply forward the msg, without freeing it: */
+	talloc_steal(conn_rtp_dst->conn, irp->oph.msg);
+	irp->oph.operation = PRIM_OP_REQUEST;
+	if ((rc = osmo_iuup_rnl_prim_down(conn_rtp_dst->iuup.iui, irp)) != 0)
+		LOG_CONN_RTP(conn_rtp_dst, LOGL_ERROR, "Failed Tx data down to IuUP layer\n");
+	return rc;
+}
+
+/* Bridge received IuUP packet in conn_rtp_src to conn_rtp_dst, an RTP (no IuUP)
+ * sister conn in the endpoint. The function takes ownsership of the irp */
+static int bridge_iuup_to_rtp_peer(struct mgcp_conn_rtp *conn_rtp_src, struct mgcp_conn_rtp *conn_rtp_dst, struct osmo_iuup_rnl_prim *irp)
+{
+	/* FIXME: We probably need transcoding here?! Or at least look up AMR modes and translate to related RFCI */
+	uint8_t frame_nr = irp->u.data.frame_nr;
+	uint8_t fqc = irp->u.data.fqc;
+	struct msgb *msg = irp->oph.msg;
+	ssize_t amr_length = 0;
+	int ft;
+	uint8_t *amr_data;
+	struct rtp_hdr *rtp_hdr;
+	struct amr_hdr *amr_hdr;
+	int rc;
+
+	ft = osmo_amr_bytes_to_ft(msgb_l3len(msg));
+	if (ft < 0) {
+		LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR,
+			 "Unknown AMR format for size %u\n", msgb_l3len(msg));
+		msgb_free(msg);
+		return ft;
+	}
+	msgb_pull_to_l3(msg);
+
+	if (mgcp_codec_amr_is_octet_aligned(conn_rtp_dst->end.codec)) {
+		LOGP(DLMGCP, LOGL_DEBUG, "Convert IuUP -> AMR OA: ft %d, len %d\n", ft, msgb_length(msg));
+		amr_hdr = (struct amr_hdr *) msgb_push(msg, sizeof(struct amr_hdr));
+		amr_hdr->cmr = 15; /* no change */
+		amr_hdr->f = 0;
+		amr_hdr->q = !fqc;
+		amr_hdr->ft = ft & 0xff;
+		amr_hdr->pad1 = 0;
+		amr_hdr->pad2 = 0;
+	} else {
+		OSMO_ASSERT(msgb_tailroom(msg) >= 2);
+		msgb_put(msg, 2);
+		osmo_amr_iuup_to_bwe(msgb_data(msg), msgb_length(msg) - 2, msgb_length(msg) + 2);
+		/* fill bwe header */
+		amr_data = msgb_data(msg);
+		/* CMR no change      | follow bit | ft (3 of 4 bits) */
+		amr_data[0] = 15 << 4 | (0 << 3) | (ft >> 1);
+		amr_data[1] |= ((ft & 0x1) << 7) | (((!fqc) & 0x1) << 6);
+		amr_length = (osmo_amr_bits(ft) + 10 + 7) / 8;
+		msgb_trim(msg, amr_length);
+		LOGP(DLMGCP, LOGL_DEBUG, "Convert IuUP -> AMR BE: ft %d, len %zd\n", ft, amr_length);
+	}
+	rtp_hdr = (struct rtp_hdr *) msgb_push(msg, sizeof(*rtp_hdr));
+	*rtp_hdr = (struct rtp_hdr){
+		.csrc_count = 0,
+		.extension = 0,
+		.padding = 0,
+		.version = 0,
+		.payload_type = conn_rtp_dst->end.codec->payload_type,
+		.marker = 0,
+		.sequence = frame_nr,
+		.timestamp = 0,
+		.ssrc = 0
+	};
+
+	rc = mgcp_send(conn_rtp_dst->conn->endp, true, NULL, msg, conn_rtp_src, conn_rtp_dst);
+	msgb_free(msg);
+	return rc;
+}
+
+/* Handle RNL Data primitive received from the IuUP layer FSM: Bridge it to the
+ * sister connection in the endpoint: */
+static int _conn_iuup_rx_rnl_data(struct mgcp_conn_rtp *conn_rtp_src, struct osmo_iuup_rnl_prim *irp)
+{
+	struct mgcp_conn *conn_dst;
+	struct mgcp_conn_rtp *conn_rtp_dst;
+	int rc;
+
+	conn_dst = _find_dst_conn(conn_rtp_src->conn);
+
+	/* There is no destination conn, stop here */
+	if (!conn_dst) {
+		LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_DEBUG,
+			 "no connection to forward an incoming IuUP payload to\n");
+		rc = -1;
+		goto free_ret;
+	}
+
+	/* The destination conn is not an RTP/IuUP connection */
+	if (conn_dst->type != MGCP_CONN_TYPE_RTP) {
+		LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR,
+			 "unable to find suitable destination conn\n");
+		 rc = -1;
+		goto free_ret;
+	}
+	conn_rtp_dst = &conn_dst->u.rtp;
+
+	switch (conn_rtp_dst->type) {
+	case MGCP_RTP_IUUP:
+		return bridge_iuup_to_iuup_peer(conn_rtp_src, conn_rtp_dst, irp);
+	case MGCP_RTP_DEFAULT:
+		return bridge_iuup_to_rtp_peer(conn_rtp_src, conn_rtp_dst, irp);
+	case MGCP_RTP_OSMUX:
+	default:
+		LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_ERROR,
+			 "Forward of IuUP payload to RTP connection type %u not supported!\n",
+			 conn_rtp_dst->type);
+		rc = 0;
+	}
+
+free_ret:
+	msgb_free(irp->oph.msg);
+	return rc;
+}
+
+/* Handle RNL Status-Init primitive received from the IuUP layer FSM.
+ * Potentially configure sister conn as IuUP Init-Active: */
+static int _conn_iuup_rx_rnl_status_init(struct mgcp_conn_rtp *conn_rtp_src, struct osmo_iuup_rnl_prim *irp)
+{
+	struct mgcp_conn *conn_dst;
+	struct mgcp_conn_rtp *conn_rtp_dst;
+	int rc = 0;
+	struct msgb *msg;
+
+	if (conn_rtp_src->iuup.init_ind) {
+		/* We received more than one IuUP Initialization. It's probably
+		 * a retransmission, so simply ignore it (lower layers take care
+		 * of ACKing it). */
+		LOGPCONN(conn_rtp_src->conn, DRTP, LOGL_INFO,
+		  "Ignoring potential IuUP Initialization retrans\n");
+		return 0;
+	}
+
+	msg = msgb_copy_c(conn_rtp_src->conn, irp->oph.msg, "iuup-init-copy");
+	conn_rtp_src->iuup.init_ind = (struct osmo_iuup_rnl_prim *)msgb_data(msg);
+	conn_rtp_src->iuup.init_ind->oph.msg = msg;
+
+	/* Find RFCI containing NO_DATA: */
+	conn_rtp_src->iuup.rfci_id_no_data = _find_rfci_no_data(irp);
+
+	conn_dst = _find_dst_conn(conn_rtp_src->conn);
+	/* If not yet there, peer will potentially be IuUP-Initialized later
+	 * when we attempt to bridge audio towards it. See bridge_iuup_to_iuup_peer() */
+	if (!conn_dst)
+		return 0;
+	conn_rtp_dst = &conn_dst->u.rtp;
+	if (!mgcp_conn_rtp_is_iuup(conn_rtp_dst))
+		return 0; /* Nothing to do */
+
+	/* We received IuUP parameters on the peer (RNC), Init actively this conn (against CN): */
+	if (!conn_rtp_dst->iuup.configured)
+		rc = _conn_iuup_configure_as_active(conn_rtp_dst, irp);
+
+	return rc;
+}
+
+/* Handle RNL Status primitives received from the IuUP layer FSM: */
+static int _conn_iuup_rx_rnl_status(struct mgcp_conn_rtp *conn_rtp_src, struct osmo_iuup_rnl_prim *irp)
+{
+	int rc;
+
+	switch (irp->u.status.procedure) {
+	case IUUP_PROC_INIT:
+		rc = _conn_iuup_rx_rnl_status_init(conn_rtp_src, irp);
+		break;
+	case IUUP_PROC_RATE_CTRL:
+	case IUUP_PROC_TIME_ALIGN:
+	case IUUP_PROC_ERR_EVENT:
+	default:
+		LOG_CONN_RTP(conn_rtp_src, LOGL_ERROR,
+			     "Received IuUP RNL STATUS procedure type %u not handled\n",
+			     irp->u.status.procedure);
+		rc = 0;
+	}
+
+	return rc;
+}
+
+/* Received RNL primitive from the IuUP layer FSM containing IuUP Status or
+ * data. Continue pushing it up the stack, either IuUP Status or Data: */
+static int _conn_iuup_user_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
+{
+	struct mgcp_conn_rtp *conn_rtp_src = ctx;
+	struct osmo_iuup_rnl_prim *irp = (struct osmo_iuup_rnl_prim *)oph;
+	struct msgb *msg = oph->msg;
+	int rc;
+
+	switch (OSMO_PRIM_HDR(&irp->oph)) {
+	case OSMO_PRIM(OSMO_IUUP_RNL_DATA, PRIM_OP_INDICATION):
+		/* we pass ownsership of msg here: */
+		rc = _conn_iuup_rx_rnl_data(conn_rtp_src, irp);
+		break;
+	case OSMO_PRIM(OSMO_IUUP_RNL_STATUS, PRIM_OP_INDICATION):
+		rc = _conn_iuup_rx_rnl_status(conn_rtp_src, irp);
+		msgb_free(msg);
+		break;
+	default:
+		msgb_free(msg);
+		OSMO_ASSERT(false);
+	}
+
+	return rc;
+}
+
+/*! Send |RTP+IuUP| data down the stack of the specified destination connection.
+ *  \param[in] endp associated endpoint (for configuration, logging).
+ *  \param[in] buf buffer that contains the |RTP+IuUP| data.
+ *  \param[in] len length of the buffer that contains the |RTP+IuUP| data.
+ *  \param[in] conn_src associated source connection.
+ *  \param[in] conn_dst associated destination connection.
+ *  \returns 0 on success, -1 on ERROR. */
+static int mgcp_send_iuup(struct mgcp_endpoint *endp, struct msgb *msg,
+		   struct mgcp_conn_rtp *conn_src, struct mgcp_conn_rtp *conn_dst)
+{
+	/*! When no destination connection is available (e.g. when only one
+	 *  connection in loopback mode exists), then the source connection
+	 *  shall be specified as destination connection */
+
+	struct mgcp_rtp_end *rtp_end;
+	struct mgcp_rtp_state *rtp_state;
+	char ipbuf[INET6_ADDRSTRLEN];
+	struct rtp_hdr *hdr = (struct rtp_hdr *)msgb_data(msg);
+	int buflen = msgb_length(msg);
+	char *dest_name;
+	int len;
+
+	OSMO_ASSERT(conn_src);
+	OSMO_ASSERT(conn_dst);
+
+	LOGPENDP(endp, DRTP, LOGL_DEBUG, "delivering IuUP packet...\n");
+
+	/* Note: In case of loopback configuration, both, the source and the
+	 * destination will point to the same connection. */
+	rtp_end = &conn_dst->end;
+	rtp_state = &conn_src->state;
+	dest_name = conn_dst->conn->name;
+
+	/* Ensure we have an alternative SSRC in case we need it, see also
+	 * gen_rtp_header() */
+	if (rtp_state->alt_rtp_tx_ssrc == 0)
+		rtp_state->alt_rtp_tx_ssrc = rand();
+
+	if (!rtp_end->output_enabled) {
+		rtpconn_rate_ctr_add(conn_dst, endp, RTP_DROPPED_PACKETS_CTR, 1);
+		LOGPENDP(endp, DRTP, LOGL_DEBUG,
+			 "output disabled, drop to %s %s "
+			 "rtp_port:%u rtcp_port:%u\n",
+			 dest_name,
+			 osmo_sockaddr_ntop(&rtp_end->addr.u.sa, ipbuf),
+			 osmo_sockaddr_port(&rtp_end->addr.u.sa), ntohs(rtp_end->rtcp_port)
+			);
+		return 0;
+	}
+
+	/* Specs say, in IuUP, the RTP seqnum and timestamp should actually be
+	 * ignored by the receiver, but still it's useful for debug purposes
+	 * to set it. Moreover, it seems ip.access nano3g produces much worse
+	 * audio output on the air side if timestamp is not set properly. */
+	hdr->timestamp = osmo_htonl(mgcp_get_current_ts(rtp_end->codec->rate));
+	hdr->sequence = osmo_htons(rtp_state->alt_rtp_tx_sequence);
+	hdr->ssrc = rtp_state->alt_rtp_tx_ssrc;
+
+	LOGPENDP(endp, DRTP, LOGL_DEBUG,
+		 "process/send IuUP to %s %s rtp_port:%u rtcp_port:%u\n",
+		 dest_name, osmo_sockaddr_ntop(&rtp_end->addr.u.sa, ipbuf),
+		 osmo_sockaddr_port(&rtp_end->addr.u.sa), ntohs(rtp_end->rtcp_port));
+
+	/* Forward a copy of the RTP data to a debug ip/port */
+	forward_data_tap(rtp_end->rtp.fd, &conn_src->tap_out,
+		     msg);
+
+	len = mgcp_udp_send(rtp_end->rtp.fd, &rtp_end->addr, (char *)hdr, buflen);
+
+	if (len <= 0)
+		return len;
+
+	rtpconn_rate_ctr_add(conn_dst, endp, RTP_PACKETS_TX_CTR, 1);
+	rtpconn_rate_ctr_add(conn_dst, endp, RTP_OCTETS_TX_CTR, len);
+	rtp_state->alt_rtp_tx_sequence++;
+
+	return len;
+}
+
+/* Received TNL primitive from IuUP layer FSM, transmit it further down to the
+ * socket towards destination peer. */
+static int _conn_iuup_transport_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
+{
+	struct mgcp_conn_rtp *conn_rtp_dst = ctx;
+	struct mgcp_conn *conn_dst = conn_rtp_dst->conn;
+	struct osmo_iuup_tnl_prim *itp = (struct osmo_iuup_tnl_prim *)oph;
+	struct mgcp_conn *conn_src;
+	struct msgb *msg;
+	struct rtp_hdr *rtph;
+
+	OSMO_ASSERT(OSMO_PRIM_HDR(&itp->oph) == OSMO_PRIM(OSMO_IUUP_TNL_UNITDATA, PRIM_OP_REQUEST));
+
+	msg = oph->msg;
+	talloc_steal(conn_rtp_dst->conn, msg);
+
+	msgb_pull_to_l2(msg);
+	rtph = (struct rtp_hdr *)msgb_push(msg, sizeof(*rtph));
+	/* TODO: fill rtph properly: */
+	*rtph = (struct rtp_hdr){
+		.csrc_count = 0,
+		.extension = 0,
+		.padding = 0,
+		.version = 2,
+		.payload_type = conn_rtp_dst->end.codec->payload_type,
+		.marker = 0,
+		.sequence = 0,
+		.timestamp = 0,
+		.ssrc = 0
+	};
+
+	/* The destination of the destination conn is the source conn, right? */
+	conn_src = _find_dst_conn(conn_dst);
+	if (!conn_src) {
+		LOG_CONN_RTP(conn_rtp_dst, LOGL_NOTICE,
+			     "Couldn't find source conn for IuUP dst conn\n");
+		/* If there's no sister connection we are either still
+		 * initializing (so we want to send back Init (ACK)), or we are
+		 * probably in loopback mode anyway, so use dst as src. */
+		conn_src = conn_dst;
+	}
+
+	return mgcp_send_iuup(conn_dst->endp, msg, &conn_src->u.rtp, conn_rtp_dst);
+}
+
+/* Used to upgrade a regular RTP connection (MGCP_RTP_DEFAULT) to become a IuUP
+ * connection (MGCP_RTP_IUUP) */
+int mgcp_conn_iuup_init(struct mgcp_conn_rtp *conn_rtp)
+{
+	conn_rtp->type = MGCP_RTP_IUUP;
+	conn_rtp->iuup.iui = osmo_iuup_instance_alloc(conn_rtp->conn, conn_rtp->conn->id);
+	OSMO_ASSERT(conn_rtp->iuup.iui);
+	osmo_iuup_instance_set_user_prim_cb(conn_rtp->iuup.iui, _conn_iuup_user_prim_cb, conn_rtp);
+	osmo_iuup_instance_set_transport_prim_cb(conn_rtp->iuup.iui, _conn_iuup_transport_prim_cb, conn_rtp);
+	conn_rtp->iuup.rfci_id_no_data = -1;
+	return 0;
+}
+
+/* Cleanup specific IuUP connection (MGCP_RTP_IUUP) state, allocated by mgcp_conn_iuup_init() */
+void mgcp_conn_iuup_cleanup(struct mgcp_conn_rtp *conn_rtp)
+{
+	osmo_iuup_instance_free(conn_rtp->iuup.iui);
+	conn_rtp->iuup.iui = NULL;
+}
+
+/* Received RTP+IuUP pkt from socket of conn_rtp_src, build a TNL primitive to
+ * push it further up the stack to the IuUP layer FSM to handle and/or bridge it */
+int mgcp_conn_iuup_dispatch_rtp(struct msgb *msg)
+{
+	struct osmo_rtp_msg_ctx *mc = OSMO_RTP_MSG_CTX(msg);
+	struct mgcp_conn_rtp *conn_rtp_src = mc->conn_src;
+	int rc = 0;
+	bool force_output_enabled = false;
+	bool prev_output_enabled;
+	struct osmo_sockaddr prev_rem_addr;
+	uint16_t prev_rem_rtp_port;
+
+	OSMO_ASSERT(mgcp_conn_rtp_is_iuup(conn_rtp_src));
+
+	if ((rc = check_rtp_iuup(conn_rtp_src, msg)) < 0)
+		goto free_ret;
+
+	if (!conn_rtp_src->iuup.configured) {
+		/* We received the first message without sending any, the peer is the active side (RNC). */
+		rc = _conn_iuup_configure_as_passive(conn_rtp_src);
+		if (rc < 0)
+			goto free_ret;
+		/* We need to force allowance of RTP containing Init-ACK back: */
+		prev_output_enabled = conn_rtp_src->end.output_enabled;
+		conn_rtp_src->end.output_enabled = true;
+		force_output_enabled = true;
+		/* Fill in the peer address so that we can send Init-ACK back: */
+		prev_rem_addr = conn_rtp_src->end.addr;
+		prev_rem_rtp_port = osmo_sockaddr_port(&conn_rtp_src->end.addr.u.sa);
+		conn_rtp_src->end.addr = *mc->from_addr;
+	}
+
+	rc = _conn_iuup_rtp_pl_up(conn_rtp_src, msg);
+
+	if (force_output_enabled) {
+		conn_rtp_src->end.output_enabled = prev_output_enabled;
+		conn_rtp_src->end.addr = prev_rem_addr;
+		osmo_sockaddr_set_port(&conn_rtp_src->end.addr.u.sa, prev_rem_rtp_port);
+	}
+
+	return rc;
+free_ret:
+	msgb_free(msg);
+	return rc;
+}
+
+/* Build IuUP RNL Data primitive from msg containing an incoming RTP pkt from
+ * peer and send it down the IuUP layer towards the destination as IuUP/RTP: */
+int mgcp_conn_iuup_send_rtp(struct mgcp_conn_rtp *conn_src_rtp, struct mgcp_conn_rtp *conn_dest_rtp, struct msgb *msg)
+{
+	struct osmo_iuup_rnl_prim *irp;
+	struct rtp_hdr *rtph;
+	int rc = -1;
+	int iuup_length = 0;
+	int8_t rfci;
+
+	/* Tx RNL-DATA.req */
+	rtph = (struct rtp_hdr *)msgb_data(msg);
+	msgb_pull(msg, sizeof(*rtph));
+
+	/* FIXME: validate amr packets */
+	irp = osmo_iuup_rnl_prim_alloc(conn_dest_rtp->conn, OSMO_IUUP_RNL_DATA, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE);
+	irp->u.data.frame_nr = htons(rtph->sequence) % 16;
+
+	/* TODO: CMR handling & multiple frames handling */
+
+	if (strcmp(conn_src_rtp->end.codec->subtype_name, "AMR") != 0) {
+		LOG_CONN_RTP(conn_src_rtp, LOGL_ERROR,
+			     "Bridge RTP=>IuUP: Bridging src codec %s to IuUP AMR not supported\n",
+			     conn_src_rtp->end.codec->subtype_name);
+		goto free_ret;
+	}
+	if (mgcp_codec_amr_is_octet_aligned(conn_src_rtp->end.codec)) {
+		struct amr_hdr *amr_hdr = (struct amr_hdr *) msgb_data(msg);
+		if (msgb_length(msg) < (sizeof(*amr_hdr))) {
+			LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE,
+				     "Bridge RTP=>IuUP: too short for AMR OA hdr (%u)\n", msgb_length(msg));
+			goto free_ret;
+		}
+		if (!osmo_amr_ft_valid(amr_hdr->ft)) {
+			LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: wrong AMR OA ft=%u\n", amr_hdr->ft);
+			goto free_ret;
+		}
+		if ((rfci =  _conn_iuup_amr_ft_2_rfci(conn_dest_rtp, amr_hdr->ft)) < 0) {
+			LOG_CONN_RTP(conn_dest_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: No RFCI found for AMR OA ft=%u\n", amr_hdr->ft);
+			goto free_ret;
+		}
+		irp->u.data.fqc = amr_hdr->q ? IUUP_FQC_FRAME_GOOD : IUUP_FQC_FRAME_BAD;
+		irp->u.data.rfci = rfci;
+		msgb_pull(msg, 2);
+		LOGP(DLMGCP, LOGL_DEBUG, "Convert AMR OA -> IuUP: ft %d -> rfci %d len %d\n",
+		     amr_hdr->ft, rfci, msgb_length(msg));
+	} else {
+		uint8_t *amr_bwe_hdr = (uint8_t *) msgb_data(msg);
+		int8_t ft;
+		uint8_t q;
+		if (msgb_length(msg) < 2) {
+			LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE,
+				     "Bridge RTP=>IuUP: too short for AMR BE hdr (%u)\n", msgb_length(msg));
+			goto free_ret;
+		}
+		ft = ((amr_bwe_hdr[0] & 0x07) << 1) | ((amr_bwe_hdr[1] & 0x80) >> 7);
+		if (!osmo_amr_ft_valid(ft)) {
+			LOG_CONN_RTP(conn_src_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: wrong AMR BE ft=%u\n", ft);
+			goto free_ret;
+		}
+		if ((rfci =  _conn_iuup_amr_ft_2_rfci(conn_dest_rtp, ft)) < 0) {
+			LOG_CONN_RTP(conn_dest_rtp, LOGL_NOTICE, "Bridge RTP=>IuUP: No RFCI found for AMR BE ft=%u\n", ft);
+			goto free_ret;
+		}
+		q = amr_bwe_hdr[1] & 0x40;
+		irp->u.data.fqc = q ? IUUP_FQC_FRAME_GOOD : IUUP_FQC_FRAME_BAD;
+		irp->u.data.rfci = rfci;
+		rc = iuup_length = osmo_amr_bwe_to_iuup(msgb_data(msg), msgb_length(msg));
+		if (rc < 0) {
+			LOG_CONN_RTP(conn_dest_rtp, LOGL_ERROR, "Bridge RTP=>IuUP: Failed convert the RTP/AMR to IuUP payload\n");
+			return rc;
+		}
+		msgb_trim(msg, iuup_length);
+		LOGP(DLMGCP, LOGL_DEBUG, "Convert AMR BE -> IuUP: ft %d -> rfci %d len %d\n",
+		     ft, rfci, msgb_length(msg));
+	}
+
+	irp->oph.msg->l3h = msgb_put(irp->oph.msg, msgb_length(msg));
+	memcpy(irp->oph.msg->l3h, msgb_data(msg), msgb_length(msg));
+	if ((rc = osmo_iuup_rnl_prim_down(conn_dest_rtp->iuup.iui, irp)) != 0)
+		LOG_CONN_RTP(conn_dest_rtp, LOGL_ERROR, "Bridge RTP=>IuUP: Failed Tx RTP payload down the IuUP layer\n");
+	return rc;
+
+free_ret:
+	msgb_free(irp->oph.msg);
+	return -1;
+}
+
+/* Build IuUP RNL Data primitive from msg containing dummy content and send it
+ * down the IuUP layer towards the destination as IuUP/RTP: */
+int mgcp_conn_iuup_send_dummy(struct mgcp_conn_rtp *conn_rtp)
+{
+	struct osmo_iuup_rnl_prim *irp;
+	int rc;
+
+	if (conn_rtp->iuup.rfci_id_no_data == -1) {
+		LOG_CONN_RTP(conn_rtp, LOGL_NOTICE, "No RFCI NO_DATA found, unable to send dummy packet\n");
+		return -ENOTSUP;
+	}
+
+	irp = osmo_iuup_rnl_prim_alloc(conn_rtp->conn, OSMO_IUUP_RNL_DATA, PRIM_OP_REQUEST, MGW_IUUP_MSGB_SIZE);
+	irp->u.data.frame_nr = 0;
+	irp->u.data.fqc = IUUP_FQC_FRAME_GOOD;
+	irp->u.data.rfci = conn_rtp->iuup.rfci_id_no_data;
+	irp->oph.msg->l3h = irp->oph.msg->tail;
+	if ((rc = osmo_iuup_rnl_prim_down(conn_rtp->iuup.iui, irp)) != 0) {
+		LOG_CONN_RTP(conn_rtp, LOGL_ERROR, "Failed Tx RTP dummy payload down the IuUP layer\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}

src/libosmo-mgcp/mgcp_msg.c

@@ -24,11 +24,14 @@
 
 #include <limits.h>
 
-#include <osmocom/mgcp/mgcp_internal.h>
+#include <osmocom/mgcp/mgcp.h>
+#include <osmocom/mgcp/osmux.h>
+#include <osmocom/mgcp/mgcp_protocol.h>
 #include <osmocom/mgcp/mgcp_common.h>
 #include <osmocom/mgcp/mgcp_msg.h>
 #include <osmocom/mgcp/mgcp_conn.h>
 #include <osmocom/mgcp/mgcp_endp.h>
+#include <osmocom/mgcp/mgcp_trunk.h>
 
 /*! Display an mgcp message on the log output.
  *  \param[in] message mgcp message string
@@ -72,7 +75,7 @@ void mgcp_disp_msg(unsigned char *message, unsigned int len, char *preamble)
 }
 
 /*! Parse connection mode.
- *  \param[in] mode as string (recvonly, sendrecv, sendonly or loopback)
+ *  \param[in] mode as string (recvonly, sendrecv, sendonly confecho or loopback)
  *  \param[in] endp pointer to endpoint (only used for log output)
  *  \param[out] associated connection to be modified accordingly
  *  \returns 0 on success, -1 on error */
@@ -82,9 +85,8 @@ int mgcp_parse_conn_mode(const char *mode, struct mgcp_endpoint *endp,
 	int ret = 0;
 
 	if (!mode) {
-		LOGP(DLMGCP, LOGL_ERROR,
-		     "endpoint:0x%x missing connection mode\n",
-		     ENDPOINT_NUMBER(endp));
+		LOGPCONN(conn, DLMGCP, LOGL_ERROR,
+			 "missing connection mode\n");
 		return -1;
 	}
 	if (!conn)
@@ -92,39 +94,36 @@ int mgcp_parse_conn_mode(const char *mode, struct mgcp_endpoint *endp,
 	if (!endp)
 		return -1;
 
-	if (strcmp(mode, "recvonly") == 0)
+	if (strcasecmp(mode, "recvonly") == 0)
 		conn->mode = MGCP_CONN_RECV_ONLY;
-	else if (strcmp(mode, "sendrecv") == 0)
+	else if (strcasecmp(mode, "sendrecv") == 0)
 		conn->mode = MGCP_CONN_RECV_SEND;
-	else if (strcmp(mode, "sendonly") == 0)
+	else if (strcasecmp(mode, "sendonly") == 0)
 		conn->mode = MGCP_CONN_SEND_ONLY;
-	else if (strcmp(mode, "loopback") == 0)
+	else if (strcasecmp(mode, "confecho") == 0)
+		conn->mode = MGCP_CONN_CONFECHO;
+	else if (strcasecmp(mode, "loopback") == 0)
 		conn->mode = MGCP_CONN_LOOPBACK;
 	else {
-		LOGP(DLMGCP, LOGL_ERROR,
-		     "endpoint:0x%x unknown connection mode: '%s'\n",
-		     ENDPOINT_NUMBER(endp), mode);
+		LOGPCONN(conn, DLMGCP, LOGL_ERROR,
+			 "unknown connection mode: '%s'\n", mode);
 		ret = -1;
 	}
 
-	/* Special handling für RTP connections */
+	/* Special handling for RTP connections */
 	if (conn->type == MGCP_CONN_TYPE_RTP) {
-		conn->u.rtp.end.output_enabled =
-		    conn->mode & MGCP_CONN_SEND_ONLY ? 1 : 0;
+		conn->u.rtp.end.output_enabled = !!(conn->mode & MGCP_CONN_SEND_ONLY);
 	}
 
-	LOGP(DLMGCP, LOGL_DEBUG,
-	     "endpoint:0x%x conn:%s\n",
-	     ENDPOINT_NUMBER(endp), mgcp_conn_dump(conn));
+	LOGPENDP(endp, DLMGCP, LOGL_DEBUG, "conn:%s\n", mgcp_conn_dump(conn));
 
-	LOGP(DLMGCP, LOGL_DEBUG,
-	     "endpoint:0x%x connection mode '%s' %d\n",
-	     ENDPOINT_NUMBER(endp), mode, conn->mode);
+	LOGPCONN(conn, DLMGCP, LOGL_DEBUG, "connection mode '%s' %d\n",
+		 mode, conn->mode);
 
 	/* Special handling für RTP connections */
 	if (conn->type == MGCP_CONN_TYPE_RTP) {
-		LOGP(DLMGCP, LOGL_DEBUG, "endpoint:0x%x output_enabled %d\n",
-		     ENDPOINT_NUMBER(endp), conn->u.rtp.end.output_enabled);
+		LOGPCONN(conn, DLMGCP, LOGL_DEBUG, "output_enabled %u\n",
+			 conn->u.rtp.end.output_enabled);
 	}
 
 	/* The VTY might change the connection mode at any time, so we have
@@ -134,186 +133,20 @@ int mgcp_parse_conn_mode(const char *mode, struct mgcp_endpoint *endp,
 	return ret;
 }
 
-/* We have a null terminated string with the endpoint name here. We only
- * support two kinds. Simple ones as seen on the BSC level and the ones
- * seen on the trunk side. (helper function for find_endpoint()) */
-static struct mgcp_endpoint *find_e1_endpoint(struct mgcp_config *cfg,
-					      const char *mgcp)
-{
-	char *rest = NULL;
-	struct mgcp_trunk_config *tcfg;
-	int trunk, endp;
-	struct mgcp_endpoint *endp_ptr;
-
-	trunk = strtoul(mgcp + 6, &rest, 10);
-	if (rest == NULL || rest[0] != '/' || trunk < 1) {
-		LOGP(DLMGCP, LOGL_ERROR, "Wrong trunk name '%s'\n", mgcp);
-		return NULL;
-	}
-
-	endp = strtoul(rest + 1, &rest, 10);
-	if (rest == NULL || rest[0] != '@') {
-		LOGP(DLMGCP, LOGL_ERROR, "Wrong endpoint name '%s'\n", mgcp);
-		return NULL;
-	}
-
-	/* signalling is on timeslot 1 */
-	if (endp == 1)
-		return NULL;
-
-	tcfg = mgcp_trunk_num(cfg, trunk);
-	if (!tcfg) {
-		LOGP(DLMGCP, LOGL_ERROR, "The trunk %d is not declared.\n",
-		     trunk);
-		return NULL;
-	}
-
-	if (!tcfg->endpoints) {
-		LOGP(DLMGCP, LOGL_ERROR,
-		     "Endpoints of trunk %d not allocated.\n", trunk);
-		return NULL;
-	}
-
-	if (endp < 1 || endp >= tcfg->number_endpoints) {
-		LOGP(DLMGCP, LOGL_ERROR, "Failed to find endpoint '%s'\n",
-		     mgcp);
-		return NULL;
-	}
-
-	endp_ptr = &tcfg->endpoints[endp];
-	endp_ptr->wildcarded_req = false;
-	return endp_ptr;
-}
-
-/* Find an endpoint that is not in use. Do this by going through the endpoint
- * array, check the callid. A callid nullpointer indicates that the endpoint
- * is free */
-static struct mgcp_endpoint *find_free_endpoint(struct mgcp_endpoint *endpoints,
-						unsigned int number_endpoints)
-{
-	struct mgcp_endpoint *endp;
-	unsigned int i;
-
-	for (i = 0; i < number_endpoints; i++) {
-		if (endpoints[i].callid == NULL) {
-			endp = &endpoints[i];
-			LOGP(DLMGCP, LOGL_DEBUG,
-			     "endpoint:0x%x found free endpoint\n",
-			     ENDPOINT_NUMBER(endp));
-			endp->wildcarded_req = true;
-			return endp;
-		}
-	}
-
-	LOGP(DLMGCP, LOGL_ERROR, "Not able to find a free endpoint\n");
-	return NULL;
-}
-
-/* Check if the domain name, which is supplied with the endpoint name
- * matches the configuration. */
-static int check_domain_name(struct mgcp_config *cfg, const char *mgcp)
-{
-	char *domain_to_check;
-
-	domain_to_check = strstr(mgcp, "@");
-	if (!domain_to_check)
-		return -EINVAL;
-
-	/* Accept any domain if configured as "*" */
-	if (!strcmp(cfg->domain, "*"))
-		return 0;
-
-	if (strcmp(domain_to_check+1, cfg->domain) != 0) {
-		LOGP(DLMGCP, LOGL_ERROR, "Wrong domain name '%s', expecting '%s'\n", mgcp, cfg->domain);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-/* Search the endpoint pool for the endpoint that had been selected via the
- * MGCP message (helper function for mgcp_analyze_header()) */
-static struct mgcp_endpoint *find_endpoint(struct mgcp_config *cfg,
-					   const char *mgcp,
-					   int *cause)
-{
-	char *endptr = NULL;
-	unsigned int gw = INT_MAX;
-	const char *endpoint_number_str;
-	struct mgcp_endpoint *endp;
-
-	*cause = 0;
-
-	/* Check if the domainname in the request is correct */
-	if (check_domain_name(cfg, mgcp)) {
-		*cause = -500;
-		return NULL;
-	}
-
-	/* Check if the E1 trunk is requested */
-	if (strncmp(mgcp, "ds/e1", 5) == 0) {
-		endp = find_e1_endpoint(cfg, mgcp);
-		if (!endp)
-			*cause = -500;
-		return endp;
-	}
-
-	/* Check if the virtual trunk is addressed (new, correct way with prefix) */
-	if (strncmp
-	    (mgcp, MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK,
-	     strlen(MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK)) == 0) {
-		endpoint_number_str =
-		    mgcp + strlen(MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK);
-		if (endpoint_number_str[0] == '*') {
-			endp = find_free_endpoint(cfg->trunk.endpoints,
-						  cfg->trunk.number_endpoints);
-			if (!endp)
-				*cause = -403;
-			return endp;
-		}
-		gw = strtoul(endpoint_number_str, &endptr, 16);
-		if (gw < cfg->trunk.number_endpoints && endptr[0] == '@') {
-			endp = &cfg->trunk.endpoints[gw];
-			endp->wildcarded_req = false;
-			return endp;
-		}
-	}
-
-	/* Deprecated method without prefix */
-	LOGP(DLMGCP, LOGL_NOTICE,
-	     "Addressing virtual trunk without prefix (deprecated), please use %s: '%s'\n",
-	     MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK, mgcp);
-	gw = strtoul(mgcp, &endptr, 16);
-	if (gw < cfg->trunk.number_endpoints && endptr[0] == '@') {
-		endp = &cfg->trunk.endpoints[gw];
-		endp->wildcarded_req = false;
-		return endp;
-	}
-
-	LOGP(DLMGCP, LOGL_ERROR, "Not able to find the endpoint: '%s'\n", mgcp);
-	*cause = -500;
-	return NULL;
-}
-
 /*! Analyze and parse the the hader of an MGCP messeage string.
- *  \param[out] pdata caller provided memory to store the parsing results
- *  \param[in] data mgcp message string
- *  \returns when the status line was complete and transaction_id and
- *  endp out parameters are set, -1 on error */
+ *  \param[out] pdata caller provided memory to store the parsing results.
+ *  \param[in] data mgcp message string.
+ *  \returns 0 when the status line was complete and parseable, negative (MGCP
+ *  cause code) on error. */
 int mgcp_parse_header(struct mgcp_parse_data *pdata, char *data)
 {
 	int i = 0;
 	char *elem, *save = NULL;
-	int cause;
 
 	/*! This function will parse the header part of the received
-	 *  MGCP message. The parsing results are stored in pdata.
-	 *  The function will also automatically search the pool with
-	 *  available endpoints in order to find an endpoint that matches
-	 *  the endpoint string in in the header */
+	 *  MGCP message. The parsing results are stored in pdata. */
 
 	OSMO_ASSERT(data);
-	pdata->trans = "000000";
 
 	for (elem = strtok_r(data, " ", &save); elem;
 	     elem = strtok_r(NULL, " ", &save)) {
@@ -322,27 +155,18 @@ int mgcp_parse_header(struct mgcp_parse_data *pdata, char *data)
 			pdata->trans = elem;
 			break;
 		case 1:
-			pdata->endp = find_endpoint(pdata->cfg, elem, &cause);
-			if (!pdata->endp) {
-				LOGP(DLMGCP, LOGL_ERROR,
-				     "Unable to find Endpoint `%s'\n", elem);
-				OSMO_ASSERT(cause < 0);
-				return cause;
-			}
+			pdata->epname = elem;
 			break;
 		case 2:
-			if (strcmp("MGCP", elem)) {
+			if (strcasecmp("MGCP", elem)) {
 				LOGP(DLMGCP, LOGL_ERROR,
 				     "MGCP header parsing error\n");
 				return -510;
 			}
 			break;
 		case 3:
-			if (strcmp("1.0", elem)) {
-				LOGP(DLMGCP, LOGL_ERROR, "MGCP version `%s' "
-				     "not supported\n", elem);
+			if (strcmp("1.0", elem))
 				return -528;
-			}
 			break;
 		}
 		i++;
@@ -350,8 +174,6 @@ int mgcp_parse_header(struct mgcp_parse_data *pdata, char *data)
 
 	if (i != 4) {
 		LOGP(DLMGCP, LOGL_ERROR, "MGCP status line too short.\n");
-		pdata->trans = "000000";
-		pdata->endp = NULL;
 		return -510;
 	}
 
@@ -360,47 +182,58 @@ int mgcp_parse_header(struct mgcp_parse_data *pdata, char *data)
 
 /*! Extract OSMUX CID from an MGCP parameter line (string).
  *  \param[in] line single parameter line from the MGCP message
- *  \returns OSMUX CID, -1 on error */
+ *  \returns OSMUX CID, -1 wildcard, -2 on error */
 int mgcp_parse_osmux_cid(const char *line)
 {
 	int osmux_cid;
 
-	if (sscanf(line + 2, "Osmux: %u", &osmux_cid) != 1)
+
+	if (strcasecmp(line + 2, "Osmux: *") == 0) {
+		LOGP(DLMGCP, LOGL_DEBUG, "Parsed wilcard Osmux CID\n");
 		return -1;
+	}
+
+	if (sscanf(line + 2 + 7, "%u", &osmux_cid) != 1) {
+		LOGP(DLMGCP, LOGL_ERROR, "Failed parsing Osmux in MGCP msg line: %s\n",
+		     line);
+		return -2;
+	}
 
 	if (osmux_cid > OSMUX_CID_MAX) {
 		LOGP(DLMGCP, LOGL_ERROR, "Osmux ID too large: %u > %u\n",
 		     osmux_cid, OSMUX_CID_MAX);
-		return -1;
+		return -2;
 	}
-	LOGP(DLMGCP, LOGL_DEBUG, "bsc-nat offered Osmux CID %u\n", osmux_cid);
+	LOGP(DLMGCP, LOGL_DEBUG, "MGCP client offered Osmux CID %u\n", osmux_cid);
 
 	return osmux_cid;
 }
 
 /*! Check MGCP parameter line (string) for plausibility.
- *  \param[in] endp pointer to endpoint (only used for log output)
+ *  \param[in] endp pointer to endpoint (only used for log output, may be NULL)
+ *  \param[in] trunk pointer to trunk (only used for log output, may be NULL if endp is not NULL)
  *  \param[in] line single parameter line from the MGCP message
- *  \returns 1 when line seems plausible, 0 on error */
-int mgcp_check_param(const struct mgcp_endpoint *endp, const char *line)
+ *  \returns true when line seems plausible, false on error */
+bool mgcp_check_param(const struct mgcp_endpoint *endp, struct mgcp_trunk *trunk, const char *line)
 {
 	const size_t line_len = strlen(line);
 	if (line[0] != '\0' && line_len < 2) {
-		LOGP(DLMGCP, LOGL_ERROR,
-		     "Wrong MGCP option format: '%s' on 0x%x\n",
-		     line, ENDPOINT_NUMBER(endp));
-		return 0;
+		if (endp)
+			LOGPENDP(endp, DLMGCP, LOGL_NOTICE, "wrong MGCP option format: '%s'\n", line);
+		else
+			LOGPTRUNK(trunk, DLMGCP, LOGL_NOTICE, "wrong MGCP option format: '%s'\n", line);
+		return false;
 	}
 
 	/* FIXME: A couple more checks wouldn't hurt... */
 
-	return 1;
+	return true;
 }
 
 /*! Check if the specified callid seems plausible.
   * \param[in] endp pointer to endpoint
   * \param{in] callid to verify
-  * \returns 1 when callid seems plausible, 0 on error */
+  * \returns 0 when callid seems plausible, -1 on error */
 int mgcp_verify_call_id(struct mgcp_endpoint *endp, const char *callid)
 {
 	/*! This function compares the supplied callid with the called that is
@@ -419,9 +252,9 @@ int mgcp_verify_call_id(struct mgcp_endpoint *endp, const char *callid)
 		return -1;
 
 	if (strcmp(endp->callid, callid) != 0) {
-		LOGP(DLMGCP, LOGL_ERROR,
-		     "endpoint:0x%x CallIDs mismatch: '%s' != '%s'\n",
-		     ENDPOINT_NUMBER(endp), endp->callid, callid);
+		LOGPENDP(endp, DLMGCP, LOGL_ERROR,
+			 "CallIDs mismatch: '%s' != '%s'\n",
+			 endp->callid, callid);
 		return -1;
 	}
 
@@ -440,25 +273,23 @@ int mgcp_verify_ci(struct mgcp_endpoint *endp, const char *conn_id)
 
 	/* Check for null identifiers */
 	if (!conn_id) {
-		LOGP(DLMGCP, LOGL_ERROR,
-		     "endpoint:0x%x invalid ConnectionIdentifier (missing)\n",
-		     ENDPOINT_NUMBER(endp));
+		LOGPENDP(endp, DLMGCP, LOGL_ERROR,
+			 "invalid ConnectionIdentifier (missing)\n");
 		return 510;
 	}
 
 	/* Check for empty connection identifiers */
 	if (strlen(conn_id) == 0) {
-		LOGP(DLMGCP, LOGL_ERROR,
-		     "endpoint:0x%x invalid ConnectionIdentifier (empty)\n",
-		     ENDPOINT_NUMBER(endp));
+		LOGPENDP(endp, DLMGCP, LOGL_ERROR,
+			 "invalid ConnectionIdentifier (empty)\n");
 		return 510;
 	}
 
 	/* Check for over long connection identifiers */
 	if (strlen(conn_id) > (MGCP_CONN_ID_MAXLEN-1)) {
-		LOGP(DLMGCP, LOGL_ERROR,
-		     "endpoint:0x%x invalid ConnectionIdentifier (too long: %zu > %d) 0x%s\n",
-		     ENDPOINT_NUMBER(endp), strlen(conn_id), MGCP_CONN_ID_MAXLEN-1, conn_id);
+		LOGPENDP(endp, DLMGCP, LOGL_ERROR,
+			"invalid ConnectionIdentifier (too long: %zu > %d) 0x%s\n",
+			 strlen(conn_id), MGCP_CONN_ID_MAXLEN-1, conn_id);
 		return 510;
 	}
 
@@ -466,9 +297,8 @@ int mgcp_verify_ci(struct mgcp_endpoint *endp, const char *conn_id)
 	if (mgcp_conn_get(endp, conn_id))
 		return 0;
 
-	LOGP(DLMGCP, LOGL_ERROR,
-	     "endpoint:0x%x no connection found under ConnectionIdentifier 0x%s\n",
-	     ENDPOINT_NUMBER(endp), conn_id);
+	LOGPENDP(endp, DLMGCP, LOGL_ERROR,
+	     "no connection found under ConnectionIdentifier 0x%s\n", conn_id);
 
 	/* When the conn_id was not found, return error code 515 "The transaction refers to an incorrect
 	 * connection-id (may have been already deleted)." */

src/libosmo-mgcp/mgcp_ratectr.c

@@ -0,0 +1,347 @@
+/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
+/* rate-counter implementation */
+
+/*
+ * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2009-2012 by On-Waves
+ * (C) 2017-2020 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <stdatomic.h>
+#include <errno.h>
+#include <osmocom/core/stats.h>
+#include <osmocom/core/stat_item.h>
+#include <osmocom/mgcp/mgcp_conn.h>
+#include <osmocom/mgcp/mgcp_trunk.h>
+#include <osmocom/mgcp/mgcp_protocol.h>
+#include <osmocom/mgcp/mgcp_endp.h>
+#include <osmocom/mgcp/mgcp_ratectr.h>
+
+static const struct rate_ctr_desc mgcp_general_ctr_desc[] = {
+	/* rx_msgs = rx_msgs_retransmitted + rx_msgs_handled + rx_msgs_unhandled + err_rx_msg_parse + err_rx_no_endpoint */
+	[MGCP_GENERAL_RX_MSGS_TOTAL] = { "mgcp:rx_msgs", "total number of MGCP messages received." },
+	[MGCP_GENERAL_RX_MSGS_RETRANSMITTED] = { "mgcp:rx_msgs_retransmitted", "number of received retransmissions." },
+	[MGCP_GENERAL_RX_MSGS_HANDLED] = { "mgcp:rx_msgs_handled", "number of handled MGCP messages." },
+	[MGCP_GENERAL_RX_MSGS_UNHANDLED] = { "mgcp:rx_msgs_unhandled", "number of unhandled MGCP messages." },
+	[MGCP_GENERAL_RX_FAIL_MSG_PARSE] = { "mgcp:err_rx_msg_parse", "error parsing MGCP message." },
+	[MGCP_GENERAL_RX_FAIL_NO_ENDPOINT] =
+	    { "mgcp:err_rx_no_endpoint", "can't find MGCP endpoint, probably we've used all allocated endpoints." },
+};
+
+static const struct rate_ctr_group_desc mgcp_general_ctr_group_desc = {
+	.group_name_prefix = "mgcp",
+	.group_description = "mgcp general statistics",
+	.class_id = OSMO_STATS_CLASS_GLOBAL,
+	.num_ctr = ARRAY_SIZE(mgcp_general_ctr_desc),
+	.ctr_desc = mgcp_general_ctr_desc
+};
+
+static const struct rate_ctr_desc mgcp_crcx_ctr_desc[] = {
+	[MGCP_CRCX_SUCCESS] = { "crcx:success", "CRCX command processed successfully." },
+	[MGCP_CRCX_FAIL_BAD_ACTION] = { "crcx:bad_action", "bad action in CRCX command." },
+	[MGCP_CRCX_FAIL_UNHANDLED_PARAM] = { "crcx:unhandled_param", "unhandled parameter in CRCX command." },
+	[MGCP_CRCX_FAIL_MISSING_CALLID] = { "crcx:missing_callid", "missing CallId in CRCX command." },
+	[MGCP_CRCX_FAIL_INVALID_MODE] = { "crcx:invalid_mode", "invalid connection mode in CRCX command." },
+	[MGCP_CRCX_FAIL_LIMIT_EXCEEDED] = { "crcx:limit_exceeded", "limit of concurrent connections was reached." },
+	[MGCP_CRCX_FAIL_UNKNOWN_CALLID] = { "crcx:unkown_callid", "unknown CallId in CRCX command." },
+	[MGCP_CRCX_FAIL_ALLOC_CONN] = { "crcx:alloc_conn_fail", "connection allocation failure." },
+	[MGCP_CRCX_FAIL_NO_REMOTE_CONN_DESC] =
+	    { "crcx:no_remote_conn_desc", "no opposite end specified for connection." },
+	[MGCP_CRCX_FAIL_START_RTP] = { "crcx:start_rtp_failure", "failure to start RTP processing." },
+	[MGCP_CRCX_FAIL_NO_OSMUX] = { "crcx:no_osmux", "no osmux offered by peer." },
+	[MGCP_CRCX_FAIL_INVALID_CONN_OPTIONS] = { "crcx:conn_opt", "connection options invalid." },
+	[MGCP_CRCX_FAIL_CODEC_NEGOTIATION] = { "crcx:codec_nego", "codec negotiation failure." },
+	[MGCP_CRCX_FAIL_BIND_PORT] = { "crcx:bind_port", "port bind failure." },
+	[MGCP_CRCX_FAIL_AVAIL] = { "crcx:unavailable", "endpoint unavailable." },
+	[MGCP_CRCX_FAIL_CLAIM] = { "crcx:claim", "endpoint can not be claimed." },
+};
+
+static const struct rate_ctr_group_desc mgcp_crcx_ctr_group_desc = {
+	.group_name_prefix = "crcx",
+	.group_description = "crxc statistics",
+	.class_id = OSMO_STATS_CLASS_GLOBAL,
+	.num_ctr = ARRAY_SIZE(mgcp_crcx_ctr_desc),
+	.ctr_desc = mgcp_crcx_ctr_desc
+};
+
+static const struct rate_ctr_desc mgcp_mdcx_ctr_desc[] = {
+	[MGCP_MDCX_SUCCESS] = { "mdcx:success", "MDCX command processed successfully." },
+	[MGCP_MDCX_FAIL_WILDCARD] = { "mdcx:wildcard", "wildcard endpoint names in MDCX commands are unsupported." },
+	[MGCP_MDCX_FAIL_NO_CONN] = { "mdcx:no_conn", "endpoint specified in MDCX command has no active connections." },
+	[MGCP_MDCX_FAIL_INVALID_CALLID] = { "mdcx:callid", "invalid CallId specified in MDCX command." },
+	[MGCP_MDCX_FAIL_INVALID_CONNID] = { "mdcx:connid", "invalid connection ID specified in MDCX command." },
+	[MGCP_MDCX_FAIL_UNHANDLED_PARAM] = { "crcx:unhandled_param", "unhandled parameter in MDCX command." },
+	[MGCP_MDCX_FAIL_NO_CONNID] = { "mdcx:no_connid", "no connection ID specified in MDCX command." },
+	[MGCP_MDCX_FAIL_CONN_NOT_FOUND] =
+	    { "mdcx:conn_not_found", "connection specified in MDCX command does not exist." },
+	[MGCP_MDCX_FAIL_INVALID_MODE] = { "mdcx:invalid_mode", "invalid connection mode in MDCX command." },
+	[MGCP_MDCX_FAIL_INVALID_CONN_OPTIONS] = { "mdcx:conn_opt", "connection options invalid." },
+	[MGCP_MDCX_FAIL_NO_REMOTE_CONN_DESC] =
+	    { "mdcx:no_remote_conn_desc", "no opposite end specified for connection." },
+	[MGCP_MDCX_FAIL_START_RTP] = { "mdcx:start_rtp_failure", "failure to start RTP processing." },
+	[MGCP_MDCX_FAIL_AVAIL] = { "mdcx:unavailable", "endpoint unavailable." },
+};
+
+static const struct rate_ctr_group_desc mgcp_mdcx_ctr_group_desc = {
+	.group_name_prefix = "mdcx",
+	.group_description = "mdcx statistics",
+	.class_id = OSMO_STATS_CLASS_GLOBAL,
+	.num_ctr = ARRAY_SIZE(mgcp_mdcx_ctr_desc),
+	.ctr_desc = mgcp_mdcx_ctr_desc
+};
+
+static const struct rate_ctr_desc mgcp_dlcx_ctr_desc[] = {
+	[MGCP_DLCX_SUCCESS] = { "dlcx:success", "DLCX command processed successfully." },
+	[MGCP_DLCX_FAIL_NO_CONN] = { "dlcx:no_conn", "endpoint specified in DLCX command has no active connections." },
+	[MGCP_DLCX_FAIL_INVALID_CALLID] =
+	    { "dlcx:callid", "CallId specified in DLCX command mismatches endpoint's CallId ." },
+	[MGCP_DLCX_FAIL_INVALID_CONNID] =
+	    { "dlcx:connid", "connection ID specified in DLCX command does not exist on endpoint." },
+	[MGCP_DLCX_FAIL_UNHANDLED_PARAM] = { "dlcx:unhandled_param", "unhandled parameter in DLCX command." },
+	[MGCP_DLCX_FAIL_AVAIL] = { "dlcx:unavailable", "endpoint unavailable." },
+};
+
+static const struct rate_ctr_group_desc mgcp_dlcx_ctr_group_desc = {
+	.group_name_prefix = "dlcx",
+	.group_description = "dlcx statistics",
+	.class_id = OSMO_STATS_CLASS_GLOBAL,
+	.num_ctr = ARRAY_SIZE(mgcp_dlcx_ctr_desc),
+	.ctr_desc = mgcp_dlcx_ctr_desc
+};
+
+static const struct rate_ctr_desc e1_rate_ctr_desc[] = {
+	[E1_I460_TRAU_RX_FAIL_CTR] = { "e1:rx_fail", "Inbound I.460 TRAU failures." },
+	[E1_I460_TRAU_TX_FAIL_CTR] = { "e1:tx_fail", "Outbound I.460 TRAU failures." },
+	[E1_I460_TRAU_MUX_EMPTY_CTR] = { "e1:i460", "Outbound I.460 MUX queue empty." }
+};
+
+static const struct rate_ctr_group_desc e1_rate_ctr_group_desc = {
+	.group_name_prefix = "e1",
+	.group_description = "e1 statistics",
+	.class_id = OSMO_STATS_CLASS_GLOBAL,
+	.num_ctr = ARRAY_SIZE(e1_rate_ctr_desc),
+	.ctr_desc = e1_rate_ctr_desc
+};
+
+static const struct rate_ctr_group_desc all_rtp_conn_rate_ctr_group_desc = {
+	.group_name_prefix = "all_rtp_conn",
+	.group_description = "aggregated statistics for all rtp connections",
+	.class_id = 1,
+	.num_ctr = ARRAY_SIZE(all_rtp_conn_rate_ctr_desc),
+	.ctr_desc = all_rtp_conn_rate_ctr_desc
+};
+
+static const struct rate_ctr_group_desc all_osmux_conn_rate_ctr_group_desc = {
+	.group_name_prefix = "all_osmux_conn",
+	.group_description = "aggregated statistics for all osmux connections",
+	.class_id = 1,
+	.num_ctr = ARRAY_SIZE(all_osmux_conn_rate_ctr_desc),
+	.ctr_desc = all_osmux_conn_rate_ctr_desc
+};
+
+/*! allocate global rate counters
+ *  (called once at startup).
+ *  \param[in] cfg mgw configuration for which the rate counters are allocated.
+ *  \returns 0 on success, -EINVAL on failure. */
+int mgcp_ratectr_global_alloc(struct mgcp_config *cfg)
+{
+	struct mgcp_ratectr_global *ratectr = &cfg->ratectr;
+	static atomic_uint general_rate_ctr_index = 0;
+	char ctr_name[512];
+
+	if (ratectr->mgcp_general_ctr_group == NULL) {
+		ratectr->mgcp_general_ctr_group =
+		    rate_ctr_group_alloc(cfg, &mgcp_general_ctr_group_desc, general_rate_ctr_index++);
+		if (!ratectr->mgcp_general_ctr_group)
+			return -EINVAL;
+		snprintf(ctr_name, sizeof(ctr_name), "%s:general", cfg->domain);
+		rate_ctr_group_set_name(ratectr->mgcp_general_ctr_group, ctr_name);
+	}
+	return 0;
+}
+
+/*! free global rate counters
+ *  (called once at process shutdown).
+ *  \param[in] cfg mgw configuration for which the rate counters are allocated. */
+void mgcp_ratectr_global_free(struct mgcp_config *cfg)
+{
+	struct mgcp_ratectr_global *ratectr = &cfg->ratectr;
+
+	if (ratectr->mgcp_general_ctr_group) {
+		rate_ctr_group_free(ratectr->mgcp_general_ctr_group);
+		ratectr->mgcp_general_ctr_group = NULL;
+	}
+}
+
+/*! allocate trunk specific rate counters
+ *  (called once on trunk initialization).
+ *  \param[in] trunk mgw trunk for which the rate counters are allocated.
+ *  \returns 0 on success, -EINVAL on failure */
+int mgcp_ratectr_trunk_alloc(struct mgcp_trunk *trunk)
+{
+	struct mgcp_ratectr_trunk *ratectr = &trunk->ratectr;
+	static atomic_uint crcx_rate_ctr_index = 0;
+	static atomic_uint mdcx_rate_ctr_index = 0;
+	static atomic_uint dlcx_rate_ctr_index = 0;
+	static atomic_uint all_rtp_conn_rate_ctr_index = 0;
+	static atomic_uint all_osmux_conn_rate_ctr_index = 0;
+	char ctr_name[256];
+
+	if (ratectr->mgcp_crcx_ctr_group == NULL) {
+		ratectr->mgcp_crcx_ctr_group =
+		    rate_ctr_group_alloc(trunk, &mgcp_crcx_ctr_group_desc, crcx_rate_ctr_index++);
+		if (!ratectr->mgcp_crcx_ctr_group)
+			return -EINVAL;
+		snprintf(ctr_name, sizeof(ctr_name), "%s-%u:crcx", mgcp_trunk_type_strs_str(trunk->trunk_type),
+			 trunk->trunk_nr);
+		rate_ctr_group_set_name(ratectr->mgcp_crcx_ctr_group, ctr_name);
+	}
+	if (ratectr->mgcp_mdcx_ctr_group == NULL) {
+		ratectr->mgcp_mdcx_ctr_group =
+		    rate_ctr_group_alloc(trunk, &mgcp_mdcx_ctr_group_desc, mdcx_rate_ctr_index++);
+		if (!ratectr->mgcp_mdcx_ctr_group)
+			return -EINVAL;
+		snprintf(ctr_name, sizeof(ctr_name), "%s-%u:mdcx", mgcp_trunk_type_strs_str(trunk->trunk_type),
+			 trunk->trunk_nr);
+		rate_ctr_group_set_name(ratectr->mgcp_mdcx_ctr_group, ctr_name);
+	}
+	if (ratectr->mgcp_dlcx_ctr_group == NULL) {
+		ratectr->mgcp_dlcx_ctr_group =
+		    rate_ctr_group_alloc(trunk, &mgcp_dlcx_ctr_group_desc, dlcx_rate_ctr_index++);
+		if (!ratectr->mgcp_dlcx_ctr_group)
+			return -EINVAL;
+		snprintf(ctr_name, sizeof(ctr_name), "%s-%u:dlcx", mgcp_trunk_type_strs_str(trunk->trunk_type),
+			 trunk->trunk_nr);
+		rate_ctr_group_set_name(ratectr->mgcp_dlcx_ctr_group, ctr_name);
+	}
+	if (ratectr->all_rtp_conn_stats == NULL) {
+		ratectr->all_rtp_conn_stats = rate_ctr_group_alloc(trunk, &all_rtp_conn_rate_ctr_group_desc,
+								   all_rtp_conn_rate_ctr_index++);
+		if (!ratectr->all_rtp_conn_stats)
+			return -EINVAL;
+		snprintf(ctr_name, sizeof(ctr_name), "%s-%u:rtp_conn", mgcp_trunk_type_strs_str(trunk->trunk_type),
+			 trunk->trunk_nr);
+		rate_ctr_group_set_name(ratectr->all_rtp_conn_stats, ctr_name);
+	}
+	if (ratectr->all_osmux_conn_stats == NULL) {
+		ratectr->all_osmux_conn_stats = rate_ctr_group_alloc(trunk, &all_osmux_conn_rate_ctr_group_desc,
+								   all_osmux_conn_rate_ctr_index++);
+		if (!ratectr->all_osmux_conn_stats)
+			return -EINVAL;
+		snprintf(ctr_name, sizeof(ctr_name), "%s-%u:osmux_conn", mgcp_trunk_type_strs_str(trunk->trunk_type),
+			 trunk->trunk_nr);
+		rate_ctr_group_set_name(ratectr->all_osmux_conn_stats, ctr_name);
+	}
+
+	/* E1 specific */
+	if (trunk->trunk_type == MGCP_TRUNK_E1 && ratectr->e1_stats == NULL) {
+		ratectr->e1_stats = rate_ctr_group_alloc(trunk, &e1_rate_ctr_group_desc, mdcx_rate_ctr_index++);
+		if (!ratectr->e1_stats)
+			return -EINVAL;
+		snprintf(ctr_name, sizeof(ctr_name), "%s-%u:e1", mgcp_trunk_type_strs_str(trunk->trunk_type),
+			 trunk->trunk_nr);
+		rate_ctr_group_set_name(ratectr->e1_stats, ctr_name);
+	}
+	return 0;
+}
+
+/*! free trunk specific rate counters
+ *  (called once when trunk is freed).
+ *  \param[in] trunk mgw trunk on which the rate counters are allocated. */
+void mgcp_ratectr_trunk_free(struct mgcp_trunk *trunk)
+{
+	struct mgcp_ratectr_trunk *ratectr = &trunk->ratectr;
+
+	if (ratectr->mgcp_crcx_ctr_group) {
+		rate_ctr_group_free(ratectr->mgcp_crcx_ctr_group);
+		ratectr->mgcp_crcx_ctr_group = NULL;
+	}
+	if (ratectr->mgcp_mdcx_ctr_group) {
+		rate_ctr_group_free(ratectr->mgcp_mdcx_ctr_group);
+		ratectr->mgcp_mdcx_ctr_group = NULL;
+	}
+	if (ratectr->mgcp_dlcx_ctr_group) {
+		rate_ctr_group_free(ratectr->mgcp_dlcx_ctr_group);
+		ratectr->mgcp_dlcx_ctr_group = NULL;
+	}
+	if (ratectr->all_rtp_conn_stats) {
+		rate_ctr_group_free(ratectr->all_rtp_conn_stats);
+		ratectr->all_rtp_conn_stats = NULL;
+	}
+	if (ratectr->all_osmux_conn_stats) {
+		rate_ctr_group_free(ratectr->all_osmux_conn_stats);
+		ratectr->all_osmux_conn_stats = NULL;
+	}
+
+	/* E1 specific */
+	if (ratectr->e1_stats) {
+		rate_ctr_group_free(ratectr->e1_stats);
+		ratectr->e1_stats = NULL;
+	}
+}
+
+const struct osmo_stat_item_desc trunk_stat_desc[] = {
+	[TRUNK_STAT_ENDPOINTS_TOTAL] = { "endpoints:total",
+					 "Number of endpoints that exist on the trunk",
+					 "", 60, 0 },
+	[TRUNK_STAT_ENDPOINTS_USED] = { "endpoints:used",
+					"Number of endpoints in use",
+					"", 60, 0 },
+};
+
+const struct osmo_stat_item_group_desc trunk_statg_desc = {
+	.group_name_prefix = "trunk",
+	.group_description = "mgw trunk",
+	.class_id = OSMO_STATS_CLASS_GLOBAL,
+	.num_items = ARRAY_SIZE(trunk_stat_desc),
+	.item_desc = trunk_stat_desc,
+};
+
+/*! allocate trunk specific stat items
+ *  (called once on trunk initialization).
+ *  \param[in] trunk for which the stat items are allocated.
+ *  \returns 0 on success, -EINVAL on failure. */
+int mgcp_stat_trunk_alloc(struct mgcp_trunk *trunk)
+{
+	struct mgcp_stat_trunk *stats = &trunk->stats;
+	static unsigned int common_stat_index = 0;
+	char stat_name[256];
+
+	stats->common = osmo_stat_item_group_alloc(trunk, &trunk_statg_desc, common_stat_index);
+	if (!stats->common)
+		return -EINVAL;
+	snprintf(stat_name, sizeof(stat_name), "%s-%u:common", mgcp_trunk_type_strs_str(trunk->trunk_type),
+		 trunk->trunk_nr);
+	osmo_stat_item_group_set_name(stats->common, stat_name);
+	common_stat_index++;
+
+	return 0;
+}
+
+/*! free trunk specific stat items
+ *  (called once when trunk is freed).
+ *  \param[in] trunk on which the stat items are allocated. */
+void mgcp_stat_trunk_free(struct mgcp_trunk *trunk)
+{
+	struct mgcp_stat_trunk *stats = &trunk->stats;
+
+	if (stats->common) {
+		osmo_stat_item_group_free(stats->common);
+		stats->common = NULL;
+	}
+}

src/libosmo-mgcp/mgcp_sdp.c

@@ -21,17 +21,30 @@
  */
 
 #include <osmocom/core/msgb.h>
+#include <osmocom/core/socket.h>
+#include <osmocom/core/sockaddr_str.h>
+
 #include <osmocom/mgcp/mgcp.h>
-#include <osmocom/mgcp/mgcp_internal.h>
+#include <osmocom/mgcp/osmux.h>
+#include <osmocom/mgcp/mgcp_conn.h>
+#include <osmocom/mgcp/mgcp_protocol.h>
 #include <osmocom/mgcp/mgcp_msg.h>
 #include <osmocom/mgcp/mgcp_endp.h>
+#include <osmocom/mgcp/mgcp_trunk.h>
 #include <osmocom/mgcp/mgcp_codec.h>
+#include <osmocom/mgcp/mgcp_sdp.h>
+#include <osmocom/mgcp/mgcp_protocol.h>
+
+#include <osmocom/sdp/fmtp.h>
+#include <osmocom/sdp/sdp_strings.h>
 
 #include <errno.h>
+#include <stdlib.h>
+#include <limits.h>
 
-/* A struct to store intermediate parsing results. The function
- * mgcp_parse_sdp_data() is using it as temporary storage for parsing the SDP
- * codec information. */
+/* Two structs to store intermediate parsing results. The function
+ * mgcp_parse_sdp_data() is using the following two structs as temporary
+ * storage for parsing the SDP codec information. */
 struct sdp_rtp_map {
 	/* the type */
 	int payload_type;
@@ -43,6 +56,11 @@ struct sdp_rtp_map {
 	int rate;
 	int channels;
 };
+struct sdp_fmtp_param {
+	int payload_type;
+	const char *fmtp;
+};
+
 
 /* Helper function to extrapolate missing codec parameters in a codec mao from
  * an already filled in payload_type, called from: mgcp_parse_sdp_data() */
@@ -83,7 +101,7 @@ static void codecs_initialize(void *ctx, struct sdp_rtp_map *codecs, int used)
 /* Helper function to update codec map information with additional data from
  * SDP, called from: mgcp_parse_sdp_data() */
 static void codecs_update(void *ctx, struct sdp_rtp_map *codecs, int used,
-			  int payload, const char *audio_name)
+			  int payload_type, const char *audio_name)
 {
 	int i;
 
@@ -95,7 +113,7 @@ static void codecs_update(void *ctx, struct sdp_rtp_map *codecs, int used,
 		/* Note: We can only update payload codecs that already exist
 		 * in our codec list. If we get an unexpected payload type,
 		 * we just drop it */
-		if (codecs[i].payload_type != payload)
+		if (codecs[i].payload_type != payload_type)
 			continue;
 
 		if (sscanf(audio_name, "%63[^/]/%d/%d",
@@ -112,7 +130,7 @@ static void codecs_update(void *ctx, struct sdp_rtp_map *codecs, int used,
 		return;
 	}
 
-	LOGP(DLMGCP, LOGL_ERROR, "Unconfigured PT(%d) with %s\n", payload,
+	LOGP(DLMGCP, LOGL_ERROR, "Unconfigured PT(%d) with %s\n", payload_type,
 	     audio_name);
 }
 
@@ -123,7 +141,8 @@ static int pt_from_sdp(void *ctx, struct sdp_rtp_map *codecs,
 	char *str;
 	char *str_ptr;
 	char *pt_str;
-	unsigned int pt;
+	char *pt_end;
+	unsigned long int pt;
 	unsigned int count = 0;
 	unsigned int i;
 
@@ -148,7 +167,14 @@ static int pt_from_sdp(void *ctx, struct sdp_rtp_map *codecs,
 		if (!pt_str)
 			break;
 
-		pt = atoi(pt_str);
+		errno = 0;
+		pt = strtoul(pt_str, &pt_end, 0);
+		if ((errno == ERANGE && pt == ULONG_MAX) || (errno && !pt) ||
+		    pt_str == pt_end)
+			goto error;
+
+		if (pt >> 7) /* PT is 7 bit field, higher values not allowed */
+			goto error;
 
 		/* Do not allow duplicate payload types */
 		for (i = 0; i < count; i++)
@@ -167,6 +193,96 @@ error:
 	return -EINVAL;
 }
 
+/* Extract fmtp parameters from SDP, called from: mgcp_parse_sdp_data() */
+static int fmtp_from_sdp(void *ctx, struct sdp_fmtp_param *fmtp_param, char *sdp)
+{
+	char *str;
+	char *str_ptr;
+	unsigned int pt;
+
+	memset(fmtp_param, 0, sizeof(*fmtp_param));
+
+	str = talloc_zero_size(ctx, strlen(sdp) + 1);
+	str_ptr = str;
+	strcpy(str_ptr, sdp);
+
+	/* Check if the input string begins with an fmtp token */
+	str_ptr = strstr(str_ptr, "fmtp:");
+	if (!str_ptr)
+		goto exit;
+	str_ptr += 5;
+
+	/* Extract payload type */
+	if (sscanf(str_ptr, "%u ", &pt) != 1)
+		goto error;
+	fmtp_param->payload_type = pt;
+
+	/* Advance pointer to the beginning of the parameter section */
+	str_ptr = strstr(str_ptr, " ");
+	if (!str_ptr)
+		goto error;
+	str_ptr++;
+
+	fmtp_param->fmtp = talloc_strdup(ctx, str_ptr);
+
+exit:
+	talloc_free(str);
+	return 0;
+error:
+	talloc_free(str);
+	return -EINVAL;
+}
+
+
+static int audio_ip_from_sdp(struct osmo_sockaddr *dst_addr, char *sdp)
+{
+	bool is_ipv6;
+	char ipbuf[INET6_ADDRSTRLEN];
+	if (strncmp("c=IN IP", sdp, 7) != 0)
+		return -1;
+	sdp += 7;
+	if (*sdp == '6')
+	       is_ipv6 = true;
+	else if (*sdp == '4')
+	       is_ipv6 = false;
+	else
+	       return -1;
+	sdp++;
+	if (*sdp != ' ')
+		return -1;
+	sdp++;
+	if (is_ipv6) {
+		/* 45 = INET6_ADDRSTRLEN -1 */
+		if (sscanf(sdp, "%45s", ipbuf) != 1)
+			return -1;
+		if (inet_pton(AF_INET6, ipbuf, &dst_addr->u.sin6.sin6_addr) != 1)
+			return -1;
+		dst_addr->u.sa.sa_family = AF_INET6;
+	} else {
+		/* 15 = INET_ADDRSTRLEN -1 */
+		if (sscanf(sdp, "%15s", ipbuf) != 1)
+			return -1;
+		if (inet_pton(AF_INET, ipbuf, &dst_addr->u.sin.sin_addr) != 1)
+			return -1;
+		dst_addr->u.sa.sa_family = AF_INET;
+	}
+	return 0;
+}
+
+/* Pick optional fmtp parameters by payload type, if there are no fmtp
+ * parameters, a nullpointer is returned */
+static const char *param_by_pt(int pt, struct sdp_fmtp_param *fmtp_params, unsigned int fmtp_params_len)
+{
+	unsigned int i;
+
+	for (i = 0; i < fmtp_params_len; i++) {
+		if (fmtp_params[i].payload_type == pt)
+			return fmtp_params[i].fmtp;
+	}
+
+	return NULL;
+}
+
 /*! Analyze SDP input string.
  *  \param[in] endp trunk endpoint.
  *  \param[out] conn associated rtp connection.
@@ -180,16 +296,18 @@ int mgcp_parse_sdp_data(const struct mgcp_endpoint *endp,
 {
 	struct sdp_rtp_map codecs[MGCP_MAX_CODECS];
 	unsigned int codecs_used = 0;
+	struct sdp_fmtp_param fmtp_params[MGCP_MAX_CODECS];
+	unsigned int fmtp_used = 0;
+	char ipbuf[INET6_ADDRSTRLEN];
 	char *line;
 	unsigned int i;
 	void *tmp_ctx = talloc_new(NULL);
 	struct mgcp_rtp_end *rtp;
 
-	int payload;
+	int payload_type;
 	int ptime, ptime2 = 0;
 	char audio_name[64];
 	int port, rc;
-	char ipv4[16];
 
 	OSMO_ASSERT(endp);
 	OSMO_ASSERT(conn);
@@ -207,25 +325,36 @@ int mgcp_parse_sdp_data(const struct mgcp_endpoint *endp,
 			/* skip these SDP attributes */
 			break;
 		case 'a':
-			if (sscanf(line, "a=rtpmap:%d %63s",
-				   &payload, audio_name) == 2) {
-				codecs_update(tmp_ctx, codecs,
-					      codecs_used, payload, audio_name);
-			} else
-			    if (sscanf
-				(line, "a=ptime:%d-%d", &ptime, &ptime2) >= 1) {
+			if (sscanf(line, "a=rtpmap:%d %63s", &payload_type, audio_name) == 2) {
+				codecs_update(tmp_ctx, codecs, codecs_used, payload_type, audio_name);
+				break;
+			}
+
+			if (sscanf(line, "a=ptime:%d-%d", &ptime, &ptime2) >= 1) {
 				if (ptime2 > 0 && ptime2 != ptime)
 					rtp->packet_duration_ms = 0;
 				else
 					rtp->packet_duration_ms = ptime;
-			} else if (sscanf(line, "a=maxptime:%d", &ptime2) == 1) {
-				rtp->maximum_packet_time = ptime2;
+				break;
 			}
+
+			if (sscanf(line, "a=maxptime:%d", &ptime2) == 1) {
+				rtp->maximum_packet_time = ptime2;
+				break;
+			}
+
+			if (strncmp("a=fmtp:", line, 6) == 0) {
+				rc = fmtp_from_sdp(conn->conn, &fmtp_params[fmtp_used], line);
+				if (rc >= 0)
+					fmtp_used++;
+				break;
+			}
+
 			break;
 		case 'm':
 			rc = sscanf(line, "m=audio %d RTP/AVP", &port);
 			if (rc == 1) {
-				rtp->rtp_port = htons(port);
+				osmo_sockaddr_set_port(&rtp->addr.u.sa, port);
 				rtp->rtcp_port = htons(port + 1);
 			}
 
@@ -235,17 +364,18 @@ int mgcp_parse_sdp_data(const struct mgcp_endpoint *endp,
 				codecs_used = rc;
 			break;
 		case 'c':
-
-			if (sscanf(line, "c=IN IP4 %15s", ipv4) == 1) {
-				inet_aton(ipv4, &rtp->addr);
+			if (audio_ip_from_sdp(&rtp->addr, line) < 0) {
+				talloc_free(tmp_ctx);
+				return -1;
 			}
 			break;
 		default:
-			if (p->endp)
+			if (endp)
+				/* TODO: Check spec: We used the bare endpoint number before,
+				 * now we use the endpoint name as a whole? Is this allowed? */
 				LOGP(DLMGCP, LOGL_NOTICE,
-				     "Unhandled SDP option: '%c'/%d on 0x%x\n",
-				     line[0], line[0],
-				     ENDPOINT_NUMBER(p->endp));
+				     "Unhandled SDP option: '%c'/%d on %s\n",
+				     line[0], line[0], endp->name);
 			else
 				LOGP(DLMGCP, LOGL_NOTICE,
 				     "Unhandled SDP option: '%c'/%d\n",
@@ -262,24 +392,27 @@ int mgcp_parse_sdp_data(const struct mgcp_endpoint *endp,
 
 	/* Store parsed codec information */
 	for (i = 0; i < codecs_used; i++) {
-		rc = mgcp_codec_add(conn, codecs[i].payload_type, codecs[i].map_line);
+		const char *fmtp = param_by_pt(codecs[i].payload_type, fmtp_params, fmtp_used);
+		rc = mgcp_codec_add2(conn, codecs[i].payload_type, codecs[i].map_line, fmtp);
 		if (rc < 0)
-			LOGP(DLMGCP, LOGL_NOTICE, "endpoint:0x%x, failed to add codec\n", ENDPOINT_NUMBER(p->endp));
+			LOGPENDP(endp, DLMGCP, LOGL_NOTICE, "failed to add codec\n");
 	}
 
 	talloc_free(tmp_ctx);
 
-	LOGP(DLMGCP, LOGL_NOTICE,
+	LOGPCONN(conn->conn, DLMGCP, LOGL_NOTICE,
 	     "Got media info via SDP: port:%d, addr:%s, duration:%d, payload-types:",
-	     ntohs(rtp->rtp_port), inet_ntoa(rtp->addr),
+	     osmo_sockaddr_port(&rtp->addr.u.sa), osmo_sockaddr_ntop(&rtp->addr.u.sa, ipbuf),
 	     rtp->packet_duration_ms);
 	if (codecs_used == 0)
 		LOGPC(DLMGCP, LOGL_NOTICE, "none");
 	for (i = 0; i < codecs_used; i++) {
-		LOGPC(DLMGCP, LOGL_NOTICE, "%d=%s",
+		LOGPC(DLMGCP, LOGL_NOTICE, " %d=%s%s%s%s",
 		      rtp->codecs[i].payload_type,
-		      rtp->codecs[i].subtype_name ? rtp-> codecs[i].subtype_name : "unknown");
-		LOGPC(DLMGCP, LOGL_NOTICE, " ");
+		      strlen(rtp->codecs[i].subtype_name) ? rtp->codecs[i].subtype_name : "unknown",
+		      rtp->codecs[i].fmtp[0] ? ",fmtp='" : "",
+		      rtp->codecs[i].fmtp,
+		      rtp->codecs[i].fmtp[0] ? "'" : "");
 	}
 	LOGPC(DLMGCP, LOGL_NOTICE, "\n");
 
@@ -304,15 +437,12 @@ static int add_rtpmap(struct msgb *sdp, int payload_type, const char *audio_name
 	return 0;
 }
 
-/* Add audio string to sdp payload */
+/* Add audio strings to sdp payload */
 static int add_audio(struct msgb *sdp, int *payload_types, unsigned int payload_types_len, int local_port)
 {
 	int rc;
 	unsigned int i;
 
-	if (payload_types_len < 0)
-		return -EINVAL;
-
 	rc = msgb_printf(sdp, "m=audio %d RTP/AVP", local_port);
 	if (rc < 0)
 		return -EINVAL;
@@ -330,6 +460,32 @@ static int add_audio(struct msgb *sdp, int *payload_types, unsigned int payload_
 	return 0;
 }
 
+/* Add fmtp strings to sdp payload */
+static int add_fmtp(struct msgb *sdp, struct sdp_fmtp_param *fmtp_params, unsigned int fmtp_params_len)
+{
+	unsigned int i;
+	int rc;
+
+	for (i = 0; i < fmtp_params_len; i++) {
+		bool first = true;
+		rc = msgb_printf(sdp, "a=fmtp:%u", fmtp_params[i].payload_type);
+		if (rc < 0)
+			return -EINVAL;
+
+		/* Add amr octet align parameter */
+		if (fmtp_params[i].fmtp) {
+			msgb_printf(sdp, "%s%s", first ? " " : ";", fmtp_params[i].fmtp);
+			first = false;
+		}
+
+		rc = msgb_printf(sdp, "\r\n");
+		if (rc < 0)
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
 /*! Generate SDP response string.
  *  \param[in] endp trunk endpoint.
  *  \param[in] conn associated rtp connection.
@@ -340,29 +496,36 @@ int mgcp_write_response_sdp(const struct mgcp_endpoint *endp,
 			    const struct mgcp_conn_rtp *conn, struct msgb *sdp,
 			    const char *addr)
 {
-	const char *fmtp_extra;
+	const struct mgcp_rtp_codec *codec;
 	const char *audio_name;
 	int payload_type;
 	int rc;
 	int payload_types[1];
+	int local_port;
+	struct sdp_fmtp_param fmtp_params[1];
+        unsigned int fmtp_params_len = 0;
+	bool addr_is_v6;
 
 	OSMO_ASSERT(endp);
 	OSMO_ASSERT(conn);
 	OSMO_ASSERT(sdp);
 	OSMO_ASSERT(addr);
 
-	/* FIXME: constify endp and conn args in get_net_donwlink_format_cb() */
-	endp->cfg->get_net_downlink_format_cb((struct mgcp_endpoint *)endp,
-					      &payload_type, &audio_name,
-					      &fmtp_extra,
-					      (struct mgcp_conn_rtp *)conn);
+	codec = conn->end.codec;
+
+	audio_name = codec->audio_name;
+	payload_type = codec->payload_type;
+
+	addr_is_v6 = osmo_ip_str_type(addr) == AF_INET6;
 
 	rc = msgb_printf(sdp,
 			 "v=0\r\n"
-			 "o=- %s 23 IN IP4 %s\r\n"
+			 "o=- %s 23 IN IP%c %s\r\n"
 			 "s=-\r\n"
-			 "c=IN IP4 %s\r\n"
-			 "t=0 0\r\n", conn->conn->id, addr, addr);
+			 "c=IN IP%c %s\r\n"
+			 "t=0 0\r\n", conn->conn->id,
+			 addr_is_v6 ? '6' : '4', addr,
+			 addr_is_v6 ? '6' : '4', addr);
 
 	if (rc < 0)
 		goto buffer_too_small;
@@ -370,24 +533,41 @@ int mgcp_write_response_sdp(const struct mgcp_endpoint *endp,
 	if (payload_type >= 0) {
 
 		payload_types[0] = payload_type;
-		rc = add_audio(sdp, payload_types, 1, conn->end.local_port);
+		if (mgcp_conn_rtp_is_osmux(conn))
+			local_port = endp->trunk->cfg->osmux.local_port;
+		else
+			local_port = conn->end.local_port;
+		rc = add_audio(sdp, payload_types, 1, local_port);
 		if (rc < 0)
 			goto buffer_too_small;
 
-		if (endp->tcfg->audio_send_name) {
+		if (endp->trunk->audio_send_name) {
 			rc = add_rtpmap(sdp, payload_type, audio_name);
 			if (rc < 0)
 				goto buffer_too_small;
 		}
 
-		if (fmtp_extra) {
-			rc = msgb_printf(sdp, "%s\r\n", fmtp_extra);
-
-			if (rc < 0)
-				goto buffer_too_small;
+		if (codec->fmtp[0]) {
+			fmtp_params[0] = (struct sdp_fmtp_param){
+				.payload_type = payload_type,
+				.fmtp = codec->fmtp,
+			};
+			fmtp_params_len = 1;
+		} else if (codec->param_present) {
+			/* Legacy */
+			fmtp_params[0] = (struct sdp_fmtp_param){
+				.payload_type = payload_type,
+			};
+			fmtp_params_len = 1;
+			fmtp_params[0].fmtp = (codec->param.amr_octet_aligned ?
+					       OSMO_SDP_STR_AMR_OCTET_ALIGN_1 : OSMO_SDP_STR_AMR_OCTET_ALIGN_0);
 		}
+
+		rc = add_fmtp(sdp, fmtp_params, fmtp_params_len);
+		if (rc < 0)
+			goto buffer_too_small;
 	}
-	if (conn->end.packet_duration_ms > 0 && endp->tcfg->audio_send_ptime) {
+	if (conn->end.packet_duration_ms > 0 && endp->trunk->audio_send_ptime) {
 		rc = msgb_printf(sdp, "a=ptime:%u\r\n",
 				 conn->end.packet_duration_ms);
 		if (rc < 0)
@@ -397,6 +577,6 @@ int mgcp_write_response_sdp(const struct mgcp_endpoint *endp,
 	return 0;
 
 buffer_too_small:
-	LOGP(DLMGCP, LOGL_ERROR, "SDP messagebuffer too small\n");
+	LOGPCONN(conn->conn, DLMGCP, LOGL_ERROR, "SDP messagebuffer too small\n");
 	return -1;
 }

src/libosmo-mgcp/mgcp_stat.c

@@ -22,16 +22,24 @@
  *
  */
 
-#include <osmocom/mgcp/mgcp_stat.h>
-#include <osmocom/mgcp/mgcp_endp.h>
 #include <limits.h>
 #include <inttypes.h>
+#include <osmocom/mgcp/mgcp_protocol.h>
+#include <osmocom/mgcp/mgcp_conn.h>
+#include <osmocom/mgcp/mgcp_stat.h>
+#include <osmocom/mgcp/mgcp_endp.h>
+#include <osmocom/mgcp/mgcp_trunk.h>
 
 /* Helper function for mgcp_format_stats_rtp() to calculate packet loss */
+#if defined(__has_attribute)
+#if __has_attribute(no_sanitize)
+__attribute__((no_sanitize("undefined")))
+#endif
+#endif
 void calc_loss(struct mgcp_conn_rtp *conn, uint32_t *expected, int *loss)
 {
 	struct mgcp_rtp_state *state = &conn->state;
-	struct rate_ctr *packets_rx = &conn->rate_ctr_group->ctr[RTP_PACKETS_RX_CTR];
+	struct rate_ctr *packets_rx = rate_ctr_group_get_ctr(conn->ctrg, RTP_PACKETS_RX_CTR);
 
 	*expected = state->stats.cycles + state->stats.max_seq;
 	*expected = *expected - state->stats.base_seq + 1;
@@ -72,10 +80,10 @@ static void mgcp_format_stats_rtp(char *str, size_t str_len,
 	int ploss;
 	int nchars;
 
-	struct rate_ctr *packets_rx = &conn->rate_ctr_group->ctr[RTP_PACKETS_RX_CTR];
-	struct rate_ctr *octets_rx = &conn->rate_ctr_group->ctr[RTP_OCTETS_RX_CTR];
-	struct rate_ctr *packets_tx = &conn->rate_ctr_group->ctr[RTP_PACKETS_TX_CTR];
-	struct rate_ctr *octets_tx = &conn->rate_ctr_group->ctr[RTP_OCTETS_TX_CTR];
+	struct rate_ctr *packets_rx = rate_ctr_group_get_ctr(conn->ctrg, RTP_PACKETS_RX_CTR);
+	struct rate_ctr *octets_rx = rate_ctr_group_get_ctr(conn->ctrg, RTP_OCTETS_RX_CTR);
+	struct rate_ctr *packets_tx = rate_ctr_group_get_ctr(conn->ctrg, RTP_PACKETS_TX_CTR);
+	struct rate_ctr *octets_tx = rate_ctr_group_get_ctr(conn->ctrg, RTP_OCTETS_TX_CTR);
 
 	calc_loss(conn, &expected, &ploss);
 	jitter = calc_jitter(&conn->state);
@@ -91,7 +99,7 @@ static void mgcp_format_stats_rtp(char *str, size_t str_len,
 	str += nchars;
 	str_len -= nchars;
 
-	if (conn->conn->endp->cfg->osmux != OSMUX_USAGE_OFF) {
+	if (conn->conn->endp->trunk->cfg->osmux.usage != OSMUX_USAGE_OFF) {
 		/* Error Counter */
 		nchars = snprintf(str, str_len,
 				  "\r\nX-Osmo-CP: EC TI=%" PRIu64 ", TO=%" PRIu64,
@@ -104,9 +112,12 @@ static void mgcp_format_stats_rtp(char *str, size_t str_len,
 		str_len -= nchars;
 
 		if (conn->osmux.state == OSMUX_STATE_ENABLED) {
+			struct rate_ctr *osmux_chunks_rx, *osmux_octets_rx;
+			osmux_chunks_rx = rate_ctr_group_get_ctr(conn->ctrg, OSMUX_CHUNKS_RX_CTR);
+			osmux_octets_rx = rate_ctr_group_get_ctr(conn->ctrg, OSMUX_OCTETS_RX_CTR);
 			snprintf(str, str_len,
-				 "\r\nX-Osmux-ST: CR=%u, BR=%u",
-				 conn->osmux.stats.chunks, conn->osmux.stats.octets);
+				 "\r\nX-Osmux-ST: CR=%" PRIu64 ", BR=%" PRIu64,
+				 osmux_chunks_rx->current, osmux_octets_rx->current);
 		}
 	}
 

src/libosmo-mgcp/mgcp_threads_queue.c

@@ -0,0 +1,207 @@
+/*
+ * (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Eric Wild
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <inttypes.h>
+#include <stdatomic.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/eventfd.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <talloc.h>
+
+#include <osmocom/mgcp/mgcp_threads_queue.h>
+
+/*
+classic lamport circular lockfree spsc queue:
+every "side" only writes its own ptr, but may read the other sides ptr
+
+notify reader using eventfd as soon as element is added, reader then reads until
+read fails
+-> reader pops in a loop until FALSE and might get spurious events because it
+read before it was notified, which is fine
+-> writing pushes *the same data* in a loop until TRUE, blocks
+
+shutting this down requires
+1) to stop reading and pushing
+2) ONE side to take care of the eventfds
+*/
+
+static struct spsc *spsc_init(void *talloc_ctx, unsigned int count, unsigned int size_per_buf, bool blockr, bool blockw)
+{
+	struct spsc *q = talloc_zero_size(talloc_ctx, sizeof(struct spsc) + sizeof(uintptr_t) * count);
+	atomic_init(&q->readptr, 0);
+	atomic_init(&q->writeptr, 0);
+	q->efd_r = eventfd(0, blockr ? 0 : EFD_NONBLOCK);
+	q->efd_w = eventfd(1, blockw ? 0 : EFD_NONBLOCK);
+	q->count = count;
+	q->size_per_buf = size_per_buf;
+	q->buf = talloc_zero_size(q, size_per_buf * count);
+
+	for (int i = 0; i < count; i++)
+		q->data[i] = (uintptr_t)q->buf + i * size_per_buf;
+	return q;
+}
+
+static void spsc_deinit(struct spsc *q)
+{
+	talloc_free(q->buf);
+	close(q->efd_r);
+	close(q->efd_w);
+	talloc_free(q);
+}
+
+static ssize_t spsc_check_r(struct spsc *q)
+{
+	uint64_t efdr;
+	return read(q->efd_r, &efdr, sizeof(uint64_t));
+}
+static ssize_t spsc_check_w(struct spsc *q)
+{
+	uint64_t efdr;
+	return read(q->efd_w, &efdr, sizeof(uint64_t));
+}
+static void spsc_notify_r(struct spsc *q)
+{
+	uint64_t efdu = 1;
+	write(q->efd_r, &efdu, sizeof(uint64_t));
+}
+static void spsc_notify_w(struct spsc *q)
+{
+	uint64_t efdu = 1;
+	write(q->efd_w, &efdu, sizeof(uint64_t));
+}
+
+/*! Adds element to the queue by copying the data.
+ *  \param[in] q queue.
+ *  \param[in] elem input buffer, must match the originally configured queue buffer size!.
+ *  \returns true if queue was not full and element was successfully pushed */
+bool spsc_push(struct spsc *q, void *elem)
+{
+	size_t cur_wp, cur_rp;
+	cur_wp = atomic_load_explicit(&q->writeptr, memory_order_relaxed);
+	cur_rp = atomic_load_explicit(&q->readptr, memory_order_acquire);
+	if ((cur_wp + 1) % q->count == cur_rp) {
+		spsc_check_w(q); /* blocks, ensures next (!) call succeeds */
+		return false;
+	}
+	memcpy((void *)q->data[cur_wp], elem, q->size_per_buf);
+	atomic_store_explicit(&q->writeptr, (cur_wp + 1) % q->count, memory_order_release);
+	spsc_notify_r(q); /* fine after release */
+	return true;
+}
+
+/*! Reads the read-fd of the queue, which, depending on settings passed on queue creation, blocks.
+ * This function can be used to deliberately wait for a non-empty queue on the read side.
+ *  \param[in] q queue.
+ *  \returns result of reading the fd. */
+ssize_t spsc_prep_pop(struct spsc *q)
+{
+	return spsc_check_r(q);
+}
+
+/*! Removes element from the queue by copying the data.
+ *  \param[in] q queue.
+ *  \param[in] elem output buffer, must match the originally configured queue buffer size!.
+ *  \returns true if queue was not empty and element was successfully removed */
+bool spsc_pop(struct spsc *q, void *elem)
+{
+	size_t cur_wp, cur_rp;
+	cur_wp = atomic_load_explicit(&q->writeptr, memory_order_acquire);
+	cur_rp = atomic_load_explicit(&q->readptr, memory_order_relaxed);
+
+	if (cur_wp == cur_rp) /* blocks via prep_pop */
+		return false;
+	memcpy(elem, (void *)q->data[cur_rp], q->size_per_buf);
+	atomic_store_explicit(&q->readptr, (cur_rp + 1) % q->count, memory_order_release);
+	spsc_notify_w(q);
+	return true;
+}
+
+/*! Creates a bidirectional queue channel that consists of two queues, one in each direction,
+ *  commonly referred to as a and b side.
+ *  \param[in] talloc_ctx allocation context.
+ *  \param[in] count number of buffers per queue.
+ *  \param[in] size_per_buf size of buffers per queue.
+ *  \param[in] blockr_a should reading the a-side read fd block?.
+ *  \param[in] blockw_a should reading the a-side write fd block?.
+ *  \param[in] blockr_b should reading the b-side read fd block?.
+ *  \param[in] blockw_b should reading the b-side write fd block?.
+  *  \returns queue channel */
+struct qchan spsc_chan_init_ex(void *talloc_ctx, unsigned int count, unsigned int size_per_buf, bool blockr_a,
+			       bool blockw_a, bool blockr_b, bool blockw_b)
+{
+	struct qchan q;
+	q.a = spsc_init(talloc_ctx, count, size_per_buf, blockr_a, blockw_a);
+	q.b = spsc_init(talloc_ctx, count, size_per_buf, blockr_b, blockw_b);
+	return q;
+}
+
+/*! Creates a bidirectional queue channel that consists of two queues, one in each direction,
+ *  commonly referred to as a and b side.
+ *  \param[in] talloc_ctx allocation context.
+ *  \param[in] count number of buffers per queue.
+ *  \param[in] size_per_buf size of buffers per queue.
+ *  \returns queue channel */
+struct qchan spsc_chan_init(void *talloc_ctx, unsigned int count, unsigned int size_per_buf)
+{
+	return spsc_chan_init_ex(talloc_ctx, count, size_per_buf, false, true, false, true);
+}
+
+/*! Closes a bidirectional queue channel.
+ *  \param[in] q queue */
+void spsc_chan_close(struct qchan *q)
+{
+	spsc_deinit(q->a);
+	spsc_deinit(q->b);
+	free(q);
+}
+
+/*! Gets queue channel read/write fd for a/b side according to function name.
+ *  \param[in] q queue channel.
+ *  \returns fd */
+int spsc_get_a_rdfd(struct qchan *q)
+{
+	return q->a->efd_r;
+}
+/*! Gets queue channel read/write fd for a/b side according to function name.
+ *  \param[in] q queue channel.
+ *  \returns fd */
+int spsc_get_b_rdfd(struct qchan *q)
+{
+	return q->b->efd_r;
+}
+/*! Gets queue channel read/write fd for a/b side according to function name.
+ *  \param[in] q queue channel.
+ *  \returns fd */
+int spsc_get_a_wrfd(struct qchan *q)
+{
+	return q->a->efd_w;
+}
+/*! Gets queue channel read/write fd for a/b side according to function name.
+ *  \param[in] q queue channel.
+ *  \returns fd */
+int spsc_get_b_wrfd(struct qchan *q)
+{
+	return q->b->efd_w;
+}

src/libosmo-mgcp/mgcp_trunk.c

@@ -0,0 +1,308 @@
+/* Trunk handling */
+
+/*
+ * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2009-2012 by On-Waves
+ * (C) 2017-2020 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <osmocom/mgcp/mgcp.h>
+#include <osmocom/mgcp/mgcp_protocol.h>
+#include <osmocom/mgcp/mgcp_endp.h>
+#include <osmocom/mgcp/mgcp_trunk.h>
+#include <osmocom/mgcp/mgcp_e1.h>
+#include <osmocom/abis/e1_input.h>
+#include <osmocom/core/stat_item.h>
+
+const struct value_string mgcp_trunk_type_strs[] = {
+	{ MGCP_TRUNK_VIRTUAL,		"virtual" },
+	{ MGCP_TRUNK_E1,		"e1" },
+	{ 0, NULL }
+};
+
+/* Free trunk, this function is automatically called by talloc_free when the trunk is freed. It does not free the
+ * endpoints on the trunk, this must be done separately before freeing the trunk. */
+static int trunk_free_talloc_destructor(struct mgcp_trunk *trunk)
+{
+	llist_del(&trunk->entry);
+	mgcp_ratectr_trunk_free(trunk);
+	mgcp_stat_trunk_free(trunk);
+	return 0;
+}
+
+/*! allocate trunk and add it to the trunk list.
+ *  (called once at startup by VTY).
+ *  \param[in] cfg mgcp configuration.
+ *  \param[in] ttype trunk type.
+ *  \param[in] nr trunk number.
+ *  \returns pointer to allocated trunk, NULL on failure. */
+struct mgcp_trunk *mgcp_trunk_alloc(struct mgcp_config *cfg, enum mgcp_trunk_type ttype, unsigned int nr)
+{
+	struct mgcp_trunk *trunk;
+
+	trunk = talloc_zero(cfg, struct mgcp_trunk);
+	if (!trunk) {
+		LOGP(DLMGCP, LOGL_ERROR, "Failed to allocate.\n");
+		return NULL;
+	}
+
+	trunk->cfg = cfg;
+	trunk->trunk_type = ttype;
+	trunk->trunk_nr = nr;
+
+	trunk->audio_send_ptime = 1;
+	trunk->audio_send_name = 1;
+	trunk->v.vty_number_endpoints = 512;
+	trunk->omit_rtcp = 0;
+
+	mgcp_trunk_set_keepalive(trunk, MGCP_KEEPALIVE_ONCE);
+
+	llist_add_tail(&trunk->entry, &cfg->trunks);
+
+	mgcp_ratectr_trunk_alloc(trunk);
+	mgcp_stat_trunk_alloc(trunk);
+	talloc_set_destructor(trunk, trunk_free_talloc_destructor);
+
+	return trunk;
+}
+
+/*! allocate endpoints and set default values
+ *  (called once at startup by VTY).
+ *  \param[in] trunk trunk configuration.
+ *  \returns 0 on success, -1 on failure. */
+int mgcp_trunk_alloc_endpts(struct mgcp_trunk *trunk)
+{
+	int i;
+	struct mgcp_endpoint *endp;
+	unsigned int number_endpoints;
+	unsigned int first_endpoint_nr;
+
+	/* This function is called once on startup by the VTY to allocate the
+	 * endpoints. The number of endpoints must not change througout the
+	 * runtime of the MGW */
+	OSMO_ASSERT(trunk->number_endpoints == 0);
+	OSMO_ASSERT(trunk->endpoints == NULL);
+
+	switch (trunk->trunk_type) {
+	case MGCP_TRUNK_VIRTUAL:
+		/* Due to historical reasons the endpoints on the virtual
+		 * trunk start counting at 1. */
+		first_endpoint_nr = 1;
+		number_endpoints = trunk->v.vty_number_endpoints;
+		break;
+	case MGCP_TRUNK_E1:
+		/* The first timeslot on an E1 line is reserved for framing
+		 * and alignment and can not be used for audio transport */
+	        first_endpoint_nr = 1 * MGCP_ENDP_E1_SUBSLOTS;
+		number_endpoints = (NUM_E1_TS-1) * MGCP_ENDP_E1_SUBSLOTS;
+		break;
+	default:
+		OSMO_ASSERT(false);
+	}
+
+	/* Make sure the amount of requested endpoints does not execeed
+	 * sane limits. The VTY already limits the possible amount,
+	 * however miss-initialization of the struct or memory corruption
+	 * could still lead to an excessive allocation of endpoints, so
+	 * better stop early if that is the case. */
+	OSMO_ASSERT(number_endpoints < 65534);
+
+	/* allocate pointer array for the endpoints */
+	trunk->endpoints = talloc_zero_array(trunk, struct mgcp_endpoint*,
+					     number_endpoints);
+	if (!trunk->endpoints)
+		return -1;
+
+	/* create endpoints */
+	for (i = 0; i < number_endpoints; i++) {
+		endp = mgcp_endp_alloc(trunk, i + first_endpoint_nr);
+		if (!endp) {
+			talloc_free(trunk->endpoints);
+			return -1;
+		}
+		trunk->endpoints[i] = endp;
+	}
+
+	/* make the endpoints we just created available to the MGW code */
+	trunk->number_endpoints = number_endpoints;
+	osmo_stat_item_set(osmo_stat_item_group_get_item(trunk->stats.common, TRUNK_STAT_ENDPOINTS_TOTAL),
+			   trunk->number_endpoints);
+	return 0;
+}
+
+/*! Equip trunk with endpoints and resources
+ *  (called once at startup by VTY).
+ *  \param[in] trunk trunk configuration.
+ *  \returns 0 on success, -1 on failure. */
+int mgcp_trunk_equip(struct mgcp_trunk *trunk)
+{
+	unsigned int i;
+
+	/* Allocate endpoints */
+	if(mgcp_trunk_alloc_endpts(trunk) != 0)
+		return -1;
+
+	/* Allocate resources */
+	switch (trunk->trunk_type) {
+	case MGCP_TRUNK_VIRTUAL:
+		/* No additional initaliziation required here, virtual
+		 * endpoints will open/close network sockets themselves
+		 * on demand. */
+		break;
+	case MGCP_TRUNK_E1:
+		/* The TS initalization happens once on startup for all
+		 * timeslots. This only affects the i460 multiplexer. Until
+		 * now no E1 resources are claimed yet. This happens on demand
+		 * when the related endpoint is actually used */
+		memset(trunk->e1.i460_ts, 0, sizeof(trunk->e1.i460_ts));
+		for (i = 0; i < (NUM_E1_TS-1); i++)
+			osmo_i460_ts_init(&trunk->e1.i460_ts[i]);
+		break;
+	default:
+		OSMO_ASSERT(false);
+	}
+
+	return 0;
+}
+
+/*! get trunk configuration by trunk number (index).
+ *  \param[in] cfg mgcp configuration.
+ *  \param[in] ttype trunk type.
+ *  \param[in] nr trunk number.
+ *  \returns pointer to trunk configuration, NULL on error. */
+struct mgcp_trunk *mgcp_trunk_by_num(const struct mgcp_config *cfg, enum mgcp_trunk_type ttype, unsigned int nr)
+{
+	struct mgcp_trunk *trunk;
+
+	llist_for_each_entry(trunk, &cfg->trunks, entry) {
+		if (trunk->trunk_nr == nr && trunk->trunk_type == ttype)
+			return trunk;
+	}
+
+	return NULL;
+}
+
+/* Made public for unit-testing, do not use from outside this file */
+int e1_trunk_nr_from_epname(unsigned int *trunk_nr, const char *epname)
+{
+	unsigned long trunk_nr_temp;
+	size_t prefix_len;
+	char *str_trunk_nr_end;
+
+	prefix_len = sizeof(MGCP_ENDPOINT_PREFIX_E1_TRUNK) - 1;
+	if (strncmp(epname, MGCP_ENDPOINT_PREFIX_E1_TRUNK, prefix_len) != 0)
+		return -EINVAL;
+
+	errno = 0;
+	trunk_nr_temp = strtoul(epname + prefix_len, &str_trunk_nr_end, 10);
+	if (errno == ERANGE || trunk_nr_temp > 64
+	    || epname + prefix_len == str_trunk_nr_end
+	    || str_trunk_nr_end[0] != '/')
+		return -EINVAL;
+	else {
+		*trunk_nr = (unsigned int)trunk_nr_temp;
+		return 0;
+	}
+}
+
+/* Check if the domain name, which is supplied with the endpoint name
+ * matches the configuration. */
+static int check_domain_name(const char *epname, const struct mgcp_config *cfg)
+{
+	char *domain_to_check;
+
+	domain_to_check = strstr(epname, "@");
+	if (!domain_to_check) {
+		LOGP(DLMGCP, LOGL_ERROR, "missing domain name in endpoint name \"%s\", expecting \"%s\"\n",
+		     epname, cfg->domain);
+		return -EINVAL;
+	}
+
+	/* Accept any domain if configured as "*" */
+	if (!strcmp(cfg->domain, "*"))
+		return 0;
+
+	if (strcmp(domain_to_check+1, cfg->domain) != 0) {
+		LOGP(DLMGCP, LOGL_ERROR, "wrong domain name in endpoint name \"%s\", expecting \"%s\"\n",
+		     epname, cfg->domain);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*! Find a trunk by the trunk prefix in the endpoint name.
+ *  \param[in] epname endpoint name with trunk prefix to look up.
+ *  \param[in] cfg that contains the trunks where the endpoint is located.
+ *  \returns trunk or NULL if trunk was not found. */
+struct mgcp_trunk *mgcp_trunk_by_name(const struct mgcp_config *cfg, const char *epname)
+{
+	size_t prefix_len;
+	char epname_lc[MGCP_ENDPOINT_MAXLEN];
+	unsigned int trunk_nr;
+	int rc;
+
+	osmo_str_tolower_buf(epname_lc, sizeof(epname_lc), epname);
+	epname = epname_lc;
+
+	/* All endpoint names require a domain as suffix */
+	if (check_domain_name(epname, cfg))
+		return NULL;
+
+	prefix_len = sizeof(MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK) - 1;
+	if (strncmp(epname, MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK, prefix_len) == 0) {
+		return mgcp_trunk_by_num(cfg, MGCP_TRUNK_VIRTUAL, MGCP_VIRT_TRUNK_ID);
+	}
+
+	rc = e1_trunk_nr_from_epname(&trunk_nr, epname);
+	if (rc == 0)
+		return mgcp_trunk_by_num(cfg, MGCP_TRUNK_E1, trunk_nr);
+
+	/* Earlier versions of osmo-mgw were accepting endpoint names
+	 * without trunk prefix. This is normally not allowed, each MGCP
+	 * request should supply an endpoint name with trunk prefix.
+	 * However in order to stay compatible with old versions of
+	 * osmo-bsc and osmo-msc we still accept endpoint names without
+	 * trunk prefix and just assume that the virtual trunk should
+	 * be selected. There is even a TTCN3 test for this, see also:
+	 * MGCP_Test.TC_crcx_noprefix */
+	if ((epname[0] >= '0' && epname[0] <= '9') || (epname[0] >= 'a' && epname[0] <= 'f')) {
+		LOGP(DLMGCP, LOGL_ERROR, "missing trunk prefix in endpoint name \"%s\", assuming trunk \"%s\"!\n", epname,
+		     MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK);
+		return  mgcp_trunk_by_num(cfg, MGCP_TRUNK_VIRTUAL, MGCP_VIRT_TRUNK_ID);
+	}
+
+	LOGP(DLMGCP, LOGL_ERROR, "unable to find trunk for endpoint name \"%s\"!\n", epname);
+	return NULL;
+}
+
+/*! Find a trunk (E1) by its associated E1 line number.
+ *  \param[in] num e1 line number.
+ *  \returns trunk or NULL if trunk was not found. */
+struct mgcp_trunk *mgcp_trunk_by_line_num(const struct mgcp_config *cfg, unsigned int num)
+{
+	/*! When used on trunks other than E1, the result will always be NULL. */
+	struct mgcp_trunk *trunk;
+
+	llist_for_each_entry(trunk, &cfg->trunks, entry) {
+		if (trunk->trunk_type == MGCP_TRUNK_E1 && trunk->e1.vty_line_nr == num)
+			return trunk;
+	}
+
+	return NULL;
+}

src/libosmo-sdp/Makefile.am

@@ -0,0 +1,24 @@
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(TALLOC_CFLAGS) \
+	$(NULL)
+
+noinst_LTLIBRARIES = \
+	libosmo-sdp.la \
+	$(NULL)
+
+libosmo_sdp_la_SOURCES = \
+	fmtp.c \
+	$(NULL)
+
+libosmo_sdp_la_LIBADD = \
+	$(LIBOSMOCORE_LIBS) \
+	$(TALLOC_LIBS) \
+	$(NULL)

src/libosmo-sdp/fmtp.c

@@ -0,0 +1,150 @@
+/*
+ * (C) 2023-2024 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Neels Hofmeyr
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include <string.h>
+#include <ctype.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/logging.h>
+
+#include <osmocom/sdp/sdp_strings.h>
+#include <osmocom/sdp/fmtp.h>
+
+/* End of current fmtp parameter. Return a pointer to the next ';' character, if present, or the terminating '\0'. */
+static const char *osmo_sdp_fmtp_end(const char *fmtp)
+{
+	if (!fmtp)
+		return NULL;
+	for (; *fmtp && *fmtp != ';'; fmtp++);
+	return fmtp;
+}
+
+/* Start of next fmtp parameter. Return a pointer to the first character of the next fmtp parameter's name, or the
+ * terminating '\0'. */
+static const char *osmo_sdp_fmtp_next(const char *fmtp)
+{
+	if (!fmtp)
+		return NULL;
+	fmtp = osmo_sdp_fmtp_end(fmtp);
+	for (; *fmtp && (*fmtp == ';' || isspace(*fmtp)); fmtp++);
+	return fmtp;
+}
+
+/*! Parse a given SDP fmtp value string, returning the value of a specific option, if present.
+ *
+ * Example:
+ *
+ *   const char *fmtp_vals = "octet-align=1;mode-set=0,2,4,7";
+ *
+ *   char mode_set_str[23];
+ *   if (osmo_sdp_fmtp_get_val(mode_set_str, sizeof(mode_set_str), fmtp_vals, "mode-set")) {
+ *           // option 'mode-set' is present, now mode_set_str == "0,2,4,7"
+ *           use_modeset(mode_set_str);
+ *   } else {
+ *           // if 'mode-set' were not present...
+ *           use_modeset(MY_DEFAULT_MODESET);
+ *   }
+ *
+ * \param[out] val  Buffer to write the option's value to.
+ * \param[in] val_size  Space available in val.
+ * \param[in] fmtp  fmtp value string to parse -- must not contain the "a=fmtp:N " prefix, only the value part.
+ * \param[in] option_name  Which fmtp option to get the value for.
+ * \return true when the option was found, false when it was not present.
+ */
+bool osmo_sdp_fmtp_get_val(char *val, size_t val_size, const char *fmtp, const char *option_name)
+{
+	const char *pos = fmtp;
+	const char *end;
+	int option_name_len = strlen(option_name);
+	for (; pos && *pos; pos = osmo_sdp_fmtp_next(pos)) {
+		if (!osmo_str_startswith(pos, option_name))
+			continue;
+		pos += option_name_len;
+		if (*pos != '=')
+			continue;
+		pos++;
+		break;
+	}
+
+	if (!pos || !*pos)
+		return false;
+
+	end = osmo_sdp_fmtp_end(pos);
+	OSMO_ASSERT(end);
+	if (val && val_size)
+		osmo_strlcpy(val, pos, OSMO_MIN(val_size, end - pos + 1));
+	return true;
+}
+
+/*! Parse a given SDP fmtp value string, returning the value of a specific integer option, if present.
+ *
+ * Example:
+ *
+ *   const char *fmtp_vals = "octet-align=1;mode-set=0,2,4,7";
+ *   bool oa = osmo_sdp_fmtp_get_int(fmtp_vals, OSMO_SDP_AMR_OCTET_ALIGN_NAME, 1);
+ *
+ * \param[in] fmtp  fmtp value string to parse -- must not contain the "a=fmtp:N " prefix, only the value part.
+ * \param[in] option_name  Which fmtp option to get the value for.
+ * \param[in] default_value  If option_name is not present or cannot be parsed as integer, return this instead.
+ * \return the integer value when the option was found and actually an integer, default_value otherwise.
+ */
+int64_t osmo_sdp_fmtp_get_int(const char *fmtp, const char *option_name, int64_t default_value)
+{
+	char val[128];
+	if (!osmo_sdp_fmtp_get_val(val, sizeof(val), fmtp, option_name))
+		return default_value;
+	if (!val[0])
+		return default_value;
+	int64_t i;
+	if (osmo_str_to_int64(&i, val, 10, INT64_MIN, INT64_MAX)) {
+		/* error parsing number */
+		return default_value;
+	}
+	return i;
+}
+
+/*! Return true if octet-align is present and set to 1 in the given AMR related fmtp value.
+ * Default to octet-align=0, i.e. bandwidth-efficient mode.
+ *
+ * See RFC4867 "RTP Payload Format for AMR and AMR-WB" sections "8.1. AMR Media Type Registration" and "8.2. AMR-WB
+ * Media Type Registration":
+ *
+ *    octet-align: Permissible values are 0 and 1.  If 1, octet-align
+ *                 operation SHALL be used.  If 0 or if not present,
+ *                 bandwidth-efficient operation is employed.
+ *
+ * https://tools.ietf.org/html/rfc4867
+ */
+bool osmo_sdp_fmtp_amr_is_octet_aligned(const char *fmtp)
+{
+	return osmo_sdp_fmtp_get_int(fmtp, OSMO_SDP_STR_AMR_OCTET_ALIGN, 0) == 1;
+}
+
+static void strip_whitespace(char *str)
+{
+	char *i = str;
+	char *o = str;
+	for (; *i; i++, o++) {
+		while (isspace(*i))
+			i++;
+		*o = *i;
+		if (!*i)
+			break;
+	}
+}

src/osmo-mgw/Makefile.am

@@ -9,7 +9,10 @@ AM_CFLAGS = \
 	$(LIBOSMOCORE_CFLAGS) \
 	$(LIBOSMOVTY_CFLAGS) \
 	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOCTRL_CFLAGS) \
 	$(LIBOSMONETIF_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMOTRAU_CFLAGS) \
 	$(COVERAGE_CFLAGS) \
 	$(NULL)
 
@@ -22,9 +25,6 @@ osmo_mgw_SOURCES = \
 	$(NULL)
 
 osmo_mgw_LDADD = \
-	$(top_builddir)/src/libosmo-mgcp/libosmo-mgcp.a \
-	$(LIBOSMOCORE_LIBS) \
-	$(LIBOSMOVTY_LIBS) \
-	$(LIBOSMOGSM_LIBS) \
-	$(LIBOSMONETIF_LIBS) \
+	$(top_builddir)/src/libosmo-mgcp/libosmo-mgcp.la \
+	$(LIBOSMOCTRL_LIBS) \
 	$(NULL)

src/osmo-mgw/mgw_main.c

@@ -30,14 +30,17 @@
 #include <limits.h>
 #include <unistd.h>
 #include <errno.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/abis/e1_input.h>
 
 #include <sys/socket.h>
 
 #include <osmocom/mgcp/mgcp.h>
-#include <osmocom/mgcp/mgcp_internal.h>
+#include <osmocom/mgcp/mgcp_protocol.h>
 #include <osmocom/mgcp/vty.h>
 #include <osmocom/mgcp/debug.h>
 #include <osmocom/mgcp/mgcp_endp.h>
+#include <osmocom/mgcp/mgcp_trunk.h>
 
 #include <osmocom/core/application.h>
 #include <osmocom/core/msgb.h>
@@ -47,6 +50,8 @@
 #include <osmocom/core/rate_ctr.h>
 #include <osmocom/core/logging.h>
 #include <osmocom/core/socket.h>
+#include <osmocom/ctrl/control_if.h>
+#include <osmocom/ctrl/control_vty.h>
 
 #include <osmocom/vty/telnet_interface.h>
 #include <osmocom/vty/logging.h>
@@ -54,22 +59,30 @@
 #include <osmocom/vty/command.h>
 #include <osmocom/vty/stats.h>
 #include <osmocom/vty/misc.h>
+#include <osmocom/vty/cpu_sched_vty.h>
+
+#include <osmocom/abis/abis.h>
 
 #include "../../bscconfig.h"
 
 #define _GNU_SOURCE
 #include <getopt.h>
 
+/* can be changed once libosmocore 1.4.0 is released */
+#ifndef OSMO_CTRL_PORT_MGW
+#define OSMO_CTRL_PORT_MGW 4267
+#endif
+
 /* FIXME: Make use of the rtp proxy code */
 
 static struct mgcp_config *cfg;
-static struct mgcp_trunk_config *reset_trunk;
+static struct mgcp_trunk *reset_trunk;
 static int reset_endpoints = 0;
 static int daemonize = 0;
 
 const char *osmomgw_copyright =
 	"Copyright (C) 2009-2010 Holger Freyther and On-Waves\r\n"
-	"Copyright (C) 2017 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>\r\n"
+	"Copyright (C) 2017-2022 by sysmocom s.f.m.c. GmbH\r\n"
 	"Contributions by Pablo Neira Ayuso, Jacob Erlbeck, Neels Hofmeyr\r\n"
 	"Philipp Maier\r\n\r\n"
 	"License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>\r\n"
@@ -79,28 +92,60 @@ const char *osmomgw_copyright =
 static char *config_file = "osmo-mgw.cfg";
 
 /* used by msgb and mgcp */
-void *tall_bsc_ctx = NULL;
+void *tall_mgw_ctx = NULL;
 
-static void print_help()
+static void print_help(void)
 {
-	printf("Some useful help...\n");
+	printf("Some useful options:\n");
 	printf(" -h --help is printing this text.\n");
 	printf(" -c --config-file filename The config file to use.\n");
 	printf(" -s --disable-color\n");
 	printf(" -D --daemonize Fork the process into a background daemon\n");
 	printf(" -V --version Print the version number\n");
+
+	printf("\nVTY reference generation:\n");
+	printf("    --vty-ref-mode MODE		VTY reference generation mode (e.g. 'expert').\n");
+	printf("    --vty-ref-xml		Generate the VTY reference XML output and exit.\n");
+}
+
+static void handle_long_options(const char *prog_name, const int long_option)
+{
+	static int vty_ref_mode = VTY_REF_GEN_MODE_DEFAULT;
+
+	switch (long_option) {
+	case 1:
+		vty_ref_mode = get_string_value(vty_ref_gen_mode_names, optarg);
+		if (vty_ref_mode < 0) {
+			fprintf(stderr, "%s: Unknown VTY reference generation "
+				"mode '%s'\n", prog_name, optarg);
+			exit(2);
+		}
+		break;
+	case 2:
+		fprintf(stderr, "Generating the VTY reference in mode '%s' (%s)\n",
+			get_value_string(vty_ref_gen_mode_names, vty_ref_mode),
+			get_value_string(vty_ref_gen_mode_desc, vty_ref_mode));
+		vty_dump_xml_ref_mode(stdout, (enum vty_ref_gen_mode) vty_ref_mode);
+		exit(0);
+	default:
+		fprintf(stderr, "%s: error parsing cmdline options\n", prog_name);
+		exit(2);
+	}
 }
 
 static void handle_options(int argc, char **argv)
 {
 	while (1) {
 		int option_index = 0, c;
+		static int long_option = 0;
 		static struct option long_options[] = {
 			{"help", 0, 0, 'h'},
 			{"config-file", 1, 0, 'c'},
 			{"daemonize", 0, 0, 'D'},
 			{"version", 0, 0, 'V'},
 			{"disable-color", 0, 0, 's'},
+			{"vty-ref-mode", 1, &long_option, 1},
+			{"vty-ref-xml", 0, &long_option, 2},
 			{0, 0, 0, 0},
 		};
 
@@ -114,8 +159,11 @@ static void handle_options(int argc, char **argv)
 			print_help();
 			exit(0);
 			break;
+		case 0:
+			handle_long_options(argv[0], long_option);
+			break;
 		case 'c':
-			config_file = talloc_strdup(tall_bsc_ctx, optarg);
+			config_file = talloc_strdup(tall_mgw_ctx, optarg);
 			break;
 		case 's':
 			log_set_use_color(osmo_stderr_target, 0);
@@ -132,24 +180,28 @@ static void handle_options(int argc, char **argv)
 			break;
 		};
 	}
+	if (argc > optind) {
+		fprintf(stderr, "Unsupported positional arguments on command line\n");
+		exit(2);
+	}
 }
 
 /* Callback function to be called when the RSIP ("Reset in Progress") mgcp
  * command is received */
-static int mgcp_rsip_cb(struct mgcp_trunk_config *tcfg)
+static int mgcp_rsip_cb(struct mgcp_trunk *trunk)
 {
 	/* Set flag so that, when read_call_agent() is called next time
 	 * the reset can progress */
 	reset_endpoints = 1;
 
-	reset_trunk = tcfg;
+	reset_trunk = trunk;
 
 	return 0;
 }
 
 static int read_call_agent(struct osmo_fd *fd, unsigned int what)
 {
-	struct sockaddr_in addr;
+	struct osmo_sockaddr addr;
 	socklen_t slen = sizeof(addr);
 	struct msgb *msg;
 	struct msgb *resp;
@@ -175,14 +227,14 @@ static int read_call_agent(struct osmo_fd *fd, unsigned int what)
 	msgb_reset(msg);
 
 	if (resp) {
-		sendto(cfg->gw_fd.bfd.fd, resp->l2h, msgb_l2len(resp), 0, (struct sockaddr *) &addr, sizeof(addr));
+		sendto(cfg->gw_fd.bfd.fd, resp->l2h, msgb_l2len(resp), 0, &addr.u.sa, sizeof(addr));
 		msgb_free(resp);
 	}
 
 	/* reset endpoints */
 	if (reset_endpoints) {
 		LOGP(DLMGCP, LOGL_NOTICE,
-		     "Asked to reset endpoints: %d/%d\n",
+		     "Asked to reset endpoints: %u/%d\n",
 		     reset_trunk->trunk_nr, reset_trunk->trunk_type);
 
 		/* reset flag */
@@ -190,8 +242,8 @@ static int read_call_agent(struct osmo_fd *fd, unsigned int what)
 
 		/* Walk over all endpoints and trigger a release, this will release all
 		 * endpoints, possible open connections are forcefully dropped */
-		for (i = 1; i < reset_trunk->number_endpoints; ++i)
-			mgcp_endp_release(&reset_trunk->endpoints[i]);
+		for (i = 0; i < reset_trunk->number_endpoints; ++i)
+			mgcp_endp_release(reset_trunk->endpoints[i]);
 	}
 
 	return 0;
@@ -242,8 +294,23 @@ static const struct log_info_cat log_categories[] = {
 		  .name = "DRTP",
 		  .description = "RTP stream handling",
 		  .color = "\033[1;30m",
-		  .enabled = 1,.loglevel = LOGL_NOTICE,
-		  },
+		  .enabled = 1,
+		  .loglevel = LOGL_NOTICE,
+	},
+	[DE1] = {
+		  .name = "DE1",
+		  .description = "E1 line handling",
+		  .color = "\033[1;31m",
+		  .enabled = 1,
+		  .loglevel = LOGL_NOTICE,
+	},
+	[DOSMUX] = {
+		  .name = "DOSMUX",
+		  .description = "Osmux (Osmocom RTP multiplexing)",
+		  .color = "\033[1;32m",
+		  .enabled = 1,
+		  .loglevel = LOGL_NOTICE,
+	},
 };
 
 const struct log_info log_info = {
@@ -256,52 +323,65 @@ int main(int argc, char **argv)
 	unsigned int flags;
 	int rc;
 
-	tall_bsc_ctx = talloc_named_const(NULL, 1, "mgcp-callagent");
-	vty_info.tall_ctx = tall_bsc_ctx;
+	tall_mgw_ctx = talloc_named_const(NULL, 1, "mgcp-callagent");
+	vty_info.tall_ctx = tall_mgw_ctx;
 
-	msgb_talloc_ctx_init(tall_bsc_ctx, 0);
+	msgb_talloc_ctx_init(tall_mgw_ctx, 0);
 
 	osmo_init_ignore_signals();
-	osmo_init_logging2(tall_bsc_ctx, &log_info);
+	osmo_init_logging2(tall_mgw_ctx, &log_info);
+	libosmo_abis_init(tall_mgw_ctx);
 
 	cfg = mgcp_config_alloc();
 	if (!cfg)
 		return -1;
 
 	vty_info.copyright = osmomgw_copyright;
+	vty_info.usr_attr_desc[MGW_CMD_ATTR_NEWCONN] = \
+		"This command applies when a new connection is created";
+	vty_info.usr_attr_letters[MGW_CMD_ATTR_NEWCONN] = 'n';
+
 	vty_init(&vty_info);
-	logging_vty_add_cmds(NULL);
+	logging_vty_add_cmds();
 	osmo_talloc_vty_add_cmds();
-	osmo_stats_vty_add_cmds(&log_info);
+	osmo_stats_vty_add_cmds();
 	mgcp_vty_init();
+	ctrl_vty_init(cfg);
+	e1inp_vty_init();
+	osmo_cpu_sched_vty_init(tall_mgw_ctx);
 
 	handle_options(argc, argv);
 
-	rate_ctr_init(tall_bsc_ctx);
-	osmo_stats_init(tall_bsc_ctx);
+	rate_ctr_init(tall_mgw_ctx);
+	osmo_stats_init(tall_mgw_ctx);
 
 	rc = mgcp_parse_config(config_file, cfg, MGCP_BSC);
 	if (rc < 0)
 		return rc;
 
 	/* start telnet after reading config for vty_get_bind_addr() */
-	rc = telnet_init_dynif(tall_bsc_ctx, NULL,
-			       vty_get_bind_addr(), OSMO_VTY_PORT_MGW);
+	rc = telnet_init_default(tall_mgw_ctx, NULL, OSMO_VTY_PORT_MGW);
 	if (rc < 0)
 		return rc;
 
+	cfg->ctrl = ctrl_interface_setup(cfg, OSMO_CTRL_PORT_MGW, NULL);
+	if (!cfg->ctrl) {
+		fprintf(stderr, "Failed to init the control interface on %s:%u. Exiting\n",
+			ctrl_vty_get_bind_addr(), OSMO_CTRL_PORT_MGW);
+	}
+
 	/* Set the reset callback function. This functions is called when the
 	 * mgcp-command "RSIP" (Reset in Progress) is received */
 	cfg->reset_cb = mgcp_rsip_cb;
 
 	/* we need to bind a socket */
 	flags = OSMO_SOCK_F_BIND;
-	if (cfg->call_agent_addr)
+	if (strlen(cfg->call_agent_addr))
 		flags |= OSMO_SOCK_F_CONNECT;
 
-	rc = osmo_sock_init2_ofd(&cfg->gw_fd.bfd, AF_INET, SOCK_DGRAM, IPPROTO_UDP,
+	rc = osmo_sock_init2_ofd(&cfg->gw_fd.bfd, AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP,
 				cfg->source_addr, cfg->source_port,
-				cfg->call_agent_addr, cfg->call_agent_addr ? 2727 : 0, flags);
+				cfg->call_agent_addr, strlen(cfg->call_agent_addr) ? 2727 : 0, flags);
 	if (rc < 0) {
 		perror("Gateway failed to bind");
 		return -1;

tests/Makefile.am

@@ -1,6 +1,7 @@
 SUBDIRS = \
 	mgcp_client \
 	mgcp \
+	sdp \
 	$(NULL)
 
 # The `:;' works around a Bash 3.2 bug when the output is not writeable.
@@ -34,11 +35,11 @@ DISTCLEANFILES = \
 	$(NULL)
 
 if ENABLE_EXT_TESTS
-python-tests: $(BUILT_SOURCES)
+python-tests: $(top_builddir)/src/osmo-mgw/osmo-mgw
 	osmotestvty.py -p $(abs_top_srcdir) -w $(abs_top_builddir) -v
 	osmotestconfig.py -p $(abs_top_srcdir) -w $(abs_top_builddir) -v
 else
-python-tests: $(BUILT_SOURCES)
+python-tests:
 	echo "Not running python-based tests (determined at configure-time)"
 endif
 

tests/mgcp/Makefile.am

@@ -11,18 +11,21 @@ AM_CFLAGS = \
 	$(LIBOSMOVTY_CFLAGS) \
 	$(LIBOSMOGSM_CFLAGS) \
 	$(LIBOSMONETIF_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMOTRAU_CFLAGS) \
 	$(COVERAGE_CFLAGS) \
 	$(NULL)
 
 AM_LDFLAGS = \
 	$(COVERAGE_LDFLAGS) \
+	-no-install \
 	$(NULL)
 
 EXTRA_DIST = \
 	mgcp_test.ok \
 	$(NULL)
 
-noinst_PROGRAMS = \
+check_PROGRAMS = \
 	mgcp_test \
 	$(NULL)
 
@@ -31,11 +34,17 @@ mgcp_test_SOURCES = \
 	$(NULL)
 
 mgcp_test_LDADD = \
-	$(top_builddir)/src/libosmo-mgcp/libosmo-mgcp.a \
+	$(top_builddir)/src/libosmo-mgcp/libosmo-mgcp.la \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOVTY_LIBS) \
 	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBOSMOTRAU_LIBS) \
 	$(LIBRARY_DL) \
+	$(LIBRARY_DLSYM) \
 	$(LIBOSMONETIF_LIBS) \
 	-lm  \
 	$(NULL)
+
+update_exp:
+	$(builddir)/mgcp_test >$(srcdir)/mgcp_test.ok

tests/mgcp/mgcp_test.ok

@@ -65,7 +65,7 @@ Testing CRCX
 creating message from statically defined input:
 ---------8<---------
 CRCX 2 1@mgw MGCP 1.0
-M: recvonly
+m: recvonly
 C: 2
 L: p:20
 
@@ -97,7 +97,7 @@ Response matches our expectations.
 Dummy packets: 2
 
 ================================================
-Testing MDCX4
+Testing MDCX4_ADDR000
 creating message from statically defined input:
 ---------8<---------
 MDCX 18983216 1@mgw MGCP 1.0
@@ -113,6 +113,29 @@ m=audio 4441 RTP/AVP 99
 m=audio 4441 RTP/AVP 99
 a=rtpmap:99 AMR/8000
 a=ptime:40
+
+---------8<---------
+checking response:
+using message as statically defined for comparison
+Response matches our expectations.
+(response does not contain a connection id)
+
+================================================
+Testing MDCX4
+creating message from statically defined input:
+---------8<---------
+MDCX 18983217 1@mgw MGCP 1.0
+M: sendrecv
+C: 2
+I: %s
+L: p:20, a:AMR, nt:IN
+
+v=0
+o=- %s 23 IN IP4 5.6.7.8
+c=IN IP4 5.6.7.8
+t=0 0
+m=audio 4441 RTP/AVP 99
+a=rtpmap:99 AMR/8000
 a=ptime:40
 
 ---------8<---------
@@ -124,14 +147,14 @@ Dummy packets: 2
 
 ================================================
 Testing MDCX4_PT1
----------8<---------
-MDCX 18983217 1@mgw MGCP 1.0
+creating message from statically defined input:
+---------8<---------
 MDCX 18983218 1@mgw MGCP 1.0
 M: SENDRECV
 C: 2
 I: %s
-
-v=0
+L: p:20-40, a:AMR, nt:IN
+
 v=0
 o=- %s 23 IN IP4 5.6.7.8
 c=IN IP4 5.6.7.8
@@ -148,14 +171,14 @@ Dummy packets: 2
 Dummy packets: 2
 
 ================================================
-creating message from statically defined input:
+Testing MDCX4_PT2
 creating message from statically defined input:
 ---------8<---------
 MDCX 18983219 1@mgw MGCP 1.0
 M: sendrecv
 C: 2
-L: p:20-20, a:AMR, nt:IN
-
+I: %s
+L: p:20-20, a:AMR, nt:IN
 
 v=0
 o=- %s 23 IN IP4 5.6.7.8
@@ -172,14 +195,38 @@ Dummy packets: 2
 (response contains a connection id)
 Dummy packets: 2
 
-Testing MDCX4_PT3
+================================================
 Testing MDCX4_PT3
 creating message from statically defined input:
 ---------8<---------
 MDCX 18983220 1@mgw MGCP 1.0
 M: sendrecv
-I: %s
-L: a:AMR, nt:IN
+C: 2
+I: %s
+L: a:AMR, nt:IN
+
+v=0
+o=- %s 23 IN IP4 5.6.7.8
+c=IN IP4 5.6.7.8
+t=0 0
+m=audio 4441 RTP/AVP 99
+a=rtpmap:99 AMR/8000
+a=ptime:40
+
+---------8<---------
+checking response:
+using message with patched conn_id for comparison
+Response matches our expectations.
+(response contains a connection id)
+Dummy packets: 2
+
+================================================
+Testing MDCX4_PT4
+creating message from statically defined input:
+---------8<---------
+MDCX 18983221 1@mgw MGCP 1.0
+m: sendrecv
+c: 2
 i: %s
 l: A:amr, NT:IN
 
@@ -196,14 +243,14 @@ Dummy packets: 2
 using message with patched conn_id for comparison
 Response matches our expectations.
 (response contains a connection id)
-================================================
+Dummy packets: 2
 
 ================================================
 Testing MDCX4_SO
 creating message from statically defined input:
 ---------8<---------
-C: 2
-I: %s
+MDCX 18983222 1@mgw MGCP 1.0
+M: sendonly
 C: 2
 I: %s
 L: p:20, a:AMR, nt:IN
@@ -219,7 +266,7 @@ Response matches our expectations.
 ---------8<---------
 checking response:
 using message with patched conn_id for comparison
-
+Response matches our expectations.
 (response contains a connection id)
 
 ================================================
@@ -359,7 +406,7 @@ Testing CRCX
 ---------8<---------
 DLCX 7 1@mgw MGCP 1.0
 I: %s
----------8<---------
+C: 2
 
 ---------8<---------
 checking response:
@@ -417,7 +464,6 @@ checking response:
 Response matches our expectations.
 (response does not contain a connection id)
 
-creating message from statically defined input:
 ================================================
 Testing CRCX
 creating message from statically defined input:
@@ -446,7 +492,7 @@ Dummy packets: 2
 c=IN IP4 123.12.12.123
 m=audio 5904 RTP/AVP 97
 a=rtpmap:97 GSM-EFR/8000
----------8<---------
+a=ptime:40
 
 ---------8<---------
 checking response:
@@ -459,9 +505,107 @@ Response matches our expectations.
 Testing MDCX_TOO_LONG_CI
 creating message from statically defined input:
 ---------8<---------
-
+MDCX 18983224 1@mgw MGCP 1.0
 I: 123456789012345678901234567890123
 
+---------8<---------
+checking response:
+using message as statically defined for comparison
+Response matches our expectations.
+(response does not contain a connection id)
+
+================================================
+Testing CRCX
+creating message from statically defined input:
+---------8<---------
+CRCX 2 7@mgw MGCP 1.0
+M: recvonly
+C: 2
+X
+L: p:20
+
+v=0
+c=IN IP4 123.12.12.123
+m=audio 5904 RTP/AVP 111
+a=rtpmap:111 AMR/8000/1
+a=ptime:20
+a=fmtp:111 mode-change-capability=2; octet-align=1
+
+---------8<---------
+checking response:
+using message with patched conn_id for comparison
+Response matches our expectations.
+(response contains a connection id)
+Dummy packets: 2
+
+================================================
+Testing AUEP_NULL
+creating message from statically defined input:
+---------8<---------
+AUEP 18983215 null@mgw MGCP 1.0
+
+---------8<---------
+checking response:
+using message as statically defined for comparison
+Response matches our expectations.
+(response does not contain a connection id)
+
+================================================
+Testing CRCX_NULL
+creating message from statically defined input:
+---------8<---------
+CRCX 2 null@mgw MGCP 1.0
+m: recvonly
+C: 2
+L: p:20
+
+v=0
+c=IN IP4 123.12.12.123
+m=audio 5904 RTP/AVP 97
+a=rtpmap:97 GSM-EFR/8000
+a=ptime:40
+
+---------8<---------
+checking response:
+using message as statically defined for comparison
+Response matches our expectations.
+(response does not contain a connection id)
+
+================================================
+Testing MDCX_NULL
+creating message from statically defined input:
+---------8<---------
+MDCX 9 null@mgw MGCP 1.0
+I: %s
+
+---------8<---------
+checking response:
+using message as statically defined for comparison
+Response matches our expectations.
+(response does not contain a connection id)
+
+================================================
+Testing DLCX_NULL
+creating message from statically defined input:
+---------8<---------
+DLCX 8 null@mgw MGCP 1.0
+I: %s
+C: 2
+
+---------8<---------
+checking response:
+using message as statically defined for comparison
+Response matches our expectations.
+(response does not contain a connection id)
+
+================================================
+Testing RQNT_NULL
+creating message from statically defined input:
+---------8<---------
+RQNT 186908782 null@mgw MGCP 1.0
+X: B244F267488
+S: D/9
+
 ---------8<---------
 checking response:
 using message as statically defined for comparison
@@ -478,7 +622,7 @@ Re-transmitting CRCX
 L: p:20
 
 v=0
-a=rtpmap:97 GSM-EFR/8000
+c=IN IP4 123.12.12.123
 m=audio 5904 RTP/AVP 97
 a=rtpmap:97 GSM-EFR/8000
 a=ptime:40
@@ -590,7 +734,7 @@ Testing packet loss calculation.
 Response matches our expectations.
 Re-transmitting DLCX
 creating message from statically defined input:
-I: %s
+---------8<---------
 DLCX 7 1@mgw MGCP 1.0
 I: %s
 C: 2
@@ -722,6 +866,15 @@ Stats: Jitter = 0, Transit = -144000
 Stats: Jitter = 24, Transit = -32888
 In TS: 36728, dTS: 160, Seq: 24
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
+Stats: Jitter = 22, Transit = -32888
+In TS: 36888, dTS: 160, Seq: 25
+Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
+Stats: Jitter = 21, Transit = -32888
+In TS: 160000, dTS: 0, Seq: 1000
+Out TS change: 12000, dTS: 12000, Seq change: 1, TS Err change: in +0, out +0
+Stats: Jitter = 0, Transit = -144000
+In TS: 160160, dTS: 160, Seq: 1001
+Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
 Stats: Jitter = 0, Transit = -144000
 In TS: 160320, dTS: 160, Seq: 1002
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
@@ -816,6 +969,15 @@ Stats: Jitter = 0, Transit = -144000
 In TS: 36728, dTS: 160, Seq: 24
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
 Stats: Jitter = 22, Transit = -32888
+In TS: 36888, dTS: 160, Seq: 25
+Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
+Stats: Jitter = 21, Transit = -32888
+Output SSRC changed to 50607080
+In TS: 160000, dTS: 0, Seq: 1000
+Out TS change: 123112, dTS: 160, Seq change: 975, TS Err change: in +0, out +0
+Stats: Jitter = 0, Transit = -144000
+In TS: 160160, dTS: 160, Seq: 1001
+Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
 Stats: Jitter = 0, Transit = -144000
 In TS: 160320, dTS: 160, Seq: 1002
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
@@ -910,6 +1072,15 @@ Stats: Jitter = 0, Transit = -144000
 In TS: 36728, dTS: 160, Seq: 24
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
 Stats: Jitter = 22, Transit = -32888
+In TS: 36888, dTS: 160, Seq: 25
+Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
+Stats: Jitter = 21, Transit = -32888
+Output SSRC changed to 50607080
+In TS: 160000, dTS: 0, Seq: 1000
+Out TS change: 123112, dTS: 160, Seq change: 975, TS Err change: in +0, out +0
+Stats: Jitter = 0, Transit = -144000
+In TS: 160160, dTS: 160, Seq: 1001
+Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
 Stats: Jitter = 0, Transit = -144000
 In TS: 160320, dTS: 160, Seq: 1002
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
@@ -1002,6 +1173,15 @@ Stats: Jitter = 0, Transit = -144000
 Stats: Jitter = 24, Transit = -32888
 In TS: 36728, dTS: 160, Seq: 24
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
+Stats: Jitter = 22, Transit = -32888
+In TS: 36888, dTS: 160, Seq: 25
+Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
+Stats: Jitter = 21, Transit = -32888
+In TS: 160000, dTS: 0, Seq: 1000
+Out TS change: 12000, dTS: 12000, Seq change: 1, TS Err change: in +0, out +0
+Stats: Jitter = 0, Transit = -144000
+In TS: 160160, dTS: 160, Seq: 1001
+Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
 Stats: Jitter = 0, Transit = -144000
 In TS: 160320, dTS: 160, Seq: 1002
 Out TS change: 160, dTS: 160, Seq change: 1, TS Err change: in +0, out +0
@@ -1141,7 +1321,7 @@ Testing no rtpmap name
 a=fmtp:18 annexb=no
 a=rtpmap:4 G723/8000
 a=rtpmap:96 iLBC/8000
-a=fmtp:97 mode=30
+a=fmtp:96 mode=20
 a=rtpmap:97 iLBC/8000
 a=fmtp:97 mode=30
 a=rtpmap:101 telephone-event/8000
@@ -1170,6 +1350,245 @@ p:10, a:PCMU -> p:10, a:PCMU
 Response matches our expectations.
 Testing get_lco_identifier()
 p:10, a:PCMU -> p:10, a:PCMU
+p:10, a:PCMU -> p:10, a:PCMU
+'XXXX, p:10, a:PCMU' -> 'p:10, a:PCMU'
+'XXXX,p:10,a:PCMU' -> 'p:10,a:PCMU'
+'10,a:PCMU' -> 'a:PCMU'
+'10, a:PCMU' -> 'a:PCMU'
+'10,a: PCMU' -> 'a: PCMU'
+'10 ,a: PCMU' -> 'a: PCMU'
+', a:PCMU' -> 'a:PCMU'
+' a:PCMU' -> 'a:PCMU'
+'' -> '(null)'
+p10, aPCMU -> (null)
+'10,a :PCMU' -> '(null)'
+
+Testing mgcp_codec_find_convertible()
+#0: same order, but differing payload type numbers
+ - add codecs on conn0:
+    0: 112 AMR/8000/1 octet-aligned=1  -> rc=0
+    1:   0 PCMU/8000/1  -> rc=0
+    2: 111 GSM-HR-08/8000/1  -> rc=0
+ - add codecs on conn1:
+    0:  96 AMR/8000/1 octet-aligned=1  -> rc=0
+    1:   0 PCMU/8000/1  -> rc=0
+    2:  97 GSM-HR-08/8000/1  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:AMR, pt:112
+    conn[1]: codec:AMR, pt:96
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:AMR, pt:96
+    conn[0]: codec:AMR, pt:112
+ ===> SUCCESS: codec decision as expected!
+#1: different order and different payload type numbers
+ - add codecs on conn0:
+    0:   0 PCMU/8000/1  -> rc=0
+    1: 111 GSM-HR-08/8000/1  -> rc=0
+    2: 112 AMR/8000/1 octet-aligned=1  -> rc=0
+ - add codecs on conn1:
+    0:  97 GSM-HR-08/8000/1  -> rc=0
+    1:   0 PCMU/8000/1  -> rc=0
+    2:  96 AMR/8000/1 octet-aligned=1  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:PCMU, pt:0
+    conn[1]: codec:PCMU, pt:0
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:GSM-HR-08, pt:97
+    conn[0]: codec:GSM-HR-08, pt:111
+ ===> SUCCESS: codec decision as expected!
+#2: both sides have the same payload_type numbers assigned to differing codecs
+ - add codecs on conn0:
+    0:   0 PCMU/8000/1  -> rc=0
+    1:  96 GSM-HR-08/8000/1  -> rc=0
+    2:  97 AMR/8000/1 octet-aligned=1  -> rc=0
+ - add codecs on conn1:
+    0:  97 GSM-HR-08/8000/1  -> rc=0
+    1:   0 PCMU/8000/1  -> rc=0
+    2:  96 AMR/8000/1 octet-aligned=1  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:PCMU, pt:0
+    conn[1]: codec:PCMU, pt:0
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:GSM-HR-08, pt:97
+    conn[0]: codec:GSM-HR-08, pt:96
+ ===> SUCCESS: codec decision as expected!
+#3: conn0 has no codecs
+ - add codecs on conn0:
+    (none)
+ - add codecs on conn1:
+    0:  96 AMR/8000/1 octet-aligned=1  -> rc=0
+    1:   0 PCMU/8000/1  -> rc=0
+    2:  97 GSM-HR-08/8000/1  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    codec decision failed (expected)!
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:AMR, pt:96
+    conn[0]: codec:none, pt:none
+ ===> SUCCESS: codec decision as expected!
+#4: conn1 has no codecs
+ - add codecs on conn0:
+    0: 112 AMR/8000/1 octet-aligned=1  -> rc=0
+    1:   0 PCMU/8000/1  -> rc=0
+    2: 111 GSM-HR-08/8000/1  -> rc=0
+ - add codecs on conn1:
+    (none)
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:AMR, pt:112
+    conn[1]: codec:none, pt:none
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    codec decision failed (expected)!
+ ===> SUCCESS: codec decision as expected!
+#5: test AMR with differing octet-aligned settings (both <-> both)
+ - add codecs on conn0:
+    0: 111 AMR/8000 octet-aligned=1  -> rc=0
+    1: 112 AMR/8000 octet-aligned=0  -> rc=0
+ - add codecs on conn1:
+    0: 122 AMR/8000 octet-aligned=0  -> rc=0
+    1: 121 AMR/8000 octet-aligned=1  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:AMR, pt:111
+    conn[1]: codec:AMR, pt:121
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:AMR, pt:122
+    conn[0]: codec:AMR, pt:112
+ ===> SUCCESS: codec decision as expected!
+#6: test AMR with differing octet-aligned settings (oa <-> both)
+ - add codecs on conn0:
+    0: 111 AMR/8000 octet-aligned=1  -> rc=0
+ - add codecs on conn1:
+    0: 122 AMR/8000 octet-aligned=0  -> rc=0
+    1: 121 AMR/8000 octet-aligned=1  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:AMR, pt:111
+    conn[1]: codec:AMR, pt:121
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:AMR, pt:121
+    conn[0]: codec:AMR, pt:111
+ ===> SUCCESS: codec decision as expected!
+#7: test AMR with differing octet-aligned settings (bwe <-> both)
+ - add codecs on conn0:
+    0: 112 AMR/8000 octet-aligned=0  -> rc=0
+ - add codecs on conn1:
+    0: 122 AMR/8000 octet-aligned=0  -> rc=0
+    1: 121 AMR/8000 octet-aligned=1  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:AMR, pt:112
+    conn[1]: codec:AMR, pt:122
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:AMR, pt:122
+    conn[0]: codec:AMR, pt:112
+ ===> SUCCESS: codec decision as expected!
+#8: test AMR with missing octet-aligned settings (oa <-> unset)
+ - add codecs on conn0:
+    0: 111 AMR/8000 octet-aligned=1  -> rc=0
+ - add codecs on conn1:
+    0: 122 AMR/8000 octet-aligned=unset  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:AMR, pt:111
+    conn[1]: codec:AMR, pt:122
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:AMR, pt:122
+    conn[0]: codec:AMR, pt:111
+ ===> SUCCESS: codec decision as expected!
+#9: test AMR with missing octet-aligned settings (bwe <-> unset)
+ - add codecs on conn0:
+    0: 111 AMR/8000 octet-aligned=0  -> rc=0
+ - add codecs on conn1:
+    0: 122 AMR/8000 octet-aligned=unset  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:AMR, pt:111
+    conn[1]: codec:AMR, pt:122
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:AMR, pt:122
+    conn[0]: codec:AMR, pt:111
+ ===> SUCCESS: codec decision as expected!
+#10: test AMR with NULL param (oa <-> null)
+ - add codecs on conn0:
+    0: 112 AMR/8000 octet-aligned=1  -> rc=0
+ - add codecs on conn1:
+    0: 122 AMR/8000  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:AMR, pt:112
+    conn[1]: codec:AMR, pt:122
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:AMR, pt:122
+    conn[0]: codec:AMR, pt:112
+ ===> SUCCESS: codec decision as expected!
+#11: test AMR with NULL param (bwe <-> null)
+ - add codecs on conn0:
+    0: 112 AMR/8000 octet-aligned=0  -> rc=0
+ - add codecs on conn1:
+    0: 122 AMR/8000  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:AMR, pt:112
+    conn[1]: codec:AMR, pt:122
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:AMR, pt:122
+    conn[0]: codec:AMR, pt:112
+ ===> SUCCESS: codec decision as expected!
+#12: match FOO/8000/1 and FOO/8000 as identical, single channel is implicit
+ - add codecs on conn0:
+    0:   0 PCMU/8000/1  -> rc=0
+    1: 111 GSM-HR-08/8000/1  -> rc=0
+    2: 112 AMR/8000/1 octet-aligned=1  -> rc=0
+ - add codecs on conn1:
+    0:  97 GSM-HR-08/8000  -> rc=0
+    1:   0 PCMU/8000  -> rc=0
+    2:  96 AMR/8000 octet-aligned=1  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:PCMU, pt:0
+    conn[1]: codec:PCMU, pt:0
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:GSM-HR-08, pt:97
+    conn[0]: codec:GSM-HR-08, pt:111
+ ===> SUCCESS: codec decision as expected!
+#13: match FOO/8000/1 and FOO as identical, 8k and single channel are implicit
+ - add codecs on conn0:
+    0:   0 PCMU/8000/1  -> rc=0
+    1: 111 GSM-HR-08/8000/1  -> rc=0
+    2: 112 AMR/8000/1 octet-aligned=1  -> rc=0
+ - add codecs on conn1:
+    0:  97 GSM-HR-08  -> rc=0
+    1:   0 PCMU  -> rc=0
+    2:  96 AMR octet-aligned=1  -> rc=0
+ - mgcp_codec_decide(&conn[0], &conn[1]):
+    Codec decision result:
+    conn[0]: codec:PCMU, pt:0
+    conn[1]: codec:PCMU, pt:0
+ - mgcp_codec_decide(&conn[1], &conn[0]):
+    Codec decision result:
+    conn[1]: codec:GSM-HR-08, pt:97
+    conn[0]: codec:GSM-HR-08, pt:111
+ ===> SUCCESS: codec decision as expected!
+#14: test whether channel number matching is waterproof
+ - add codecs on conn0:
+    0: 111 GSM-HR-08/8000  -> rc=0
+    1: 112 GSM-HR-08/8000/2  -> rc=-22
+    2: 113 GSM-HR-08/8000/3  -> rc=-22
  - add codecs on conn1:
     0: 122 GSM-HR-08/8000/2  -> rc=-22
     1: 121 GSM-HR-08/8000/1  -> rc=0

tests/mgcp_client/Makefile.am

@@ -15,6 +15,7 @@ AM_CFLAGS = \
 
 AM_LDFLAGS = \
 	$(COVERAGE_LDFLAGS) \
+	-no-install \
 	$(NULL)
 
 EXTRA_DIST = \
@@ -22,7 +23,7 @@ EXTRA_DIST = \
 	mgcp_client_test.err \
 	$(NULL)
 
-noinst_PROGRAMS = \
+check_PROGRAMS = \
 	mgcp_client_test \
 	$(NULL)
 
@@ -35,6 +36,7 @@ mgcp_client_test_LDADD = \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOVTY_LIBS) \
 	$(LIBRARY_DL) \
+	$(LIBRARY_DLSYM) \
 	$(LIBOSMONETIF_LIBS) \
 	$(NULL)