Fixup configure.ac for gtplab use / debian bullseye

Related: SYS#5599
Change-Id: Ie8c1b1fa50cd4f1569f0fcb02d42c713e6e49cad

COPYING

@@ -1,661 +0,0 @@
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-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
-THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
-GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
-USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
-DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
-PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
-EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
-SUCH DAMAGES.
-
-  17. Interpretation of Sections 15 and 16.
-
-  If the disclaimer of warranty and limitation of liability provided
-above cannot be given local legal effect according to their terms,
-reviewing courts shall apply local law that most closely approximates
-an absolute waiver of all civil liability in connection with the
-Program, unless a warranty or assumption of liability accompanies a
-copy of the Program in return for a fee.
-
-                     END OF TERMS AND CONDITIONS
-
-            How to Apply These Terms to Your New Programs
-
-  If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
-  To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-state the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the program's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    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/>.
-
-Also add information on how to contact you by electronic and paper mail.
-
-  If your software can interact with users remotely through a computer
-network, you should also make sure that it provides a way for users to
-get its source.  For example, if your program is a web application, its
-interface could display a "Source" link that leads users to an archive
-of the code.  There are many ways you could offer source, and different
-solutions will be better for different programs; see section 13 for the
-specific requirements.
-
-  You should also get your employer (if you work as a programmer) or school,
-if any, to sign a "copyright disclaimer" for the program, if necessary.
-For more information on this, and how to apply and follow the GNU AGPL, see
-<http://www.gnu.org/licenses/>.

README.md

@@ -5,7 +5,7 @@ Homepage
 --------
 
 The official homepage of the project is
-https://osmocom.org/projects/osmo-upf/wiki
+https://osmocom.org/projects/osmoupf/wiki
 
 GIT Repository
 --------------

configure.ac

@@ -21,6 +21,7 @@ dnl checks for programs
 AC_PROG_MAKE_SET
 AC_PROG_CC
 AC_PROG_INSTALL
+AC_PROG_RANLIB
 LT_INIT
 
 dnl patching ${archive_cmds} to affect generation of file "libtool" to fix linking with clang
@@ -36,12 +37,15 @@ fi
 PKG_PROG_PKG_CONFIG([0.20])
 
 dnl checks for libraries
-PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 1.6.0)
-PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 1.6.0)
-PKG_CHECK_MODULES(LIBOSMOCTRL, libosmoctrl >= 1.6.0)
-PKG_CHECK_MODULES(LIBOSMOPFCP, libosmo-pfcp >= 0.1.0)
+AC_SEARCH_LIBS([dlopen], [dl dld], [LIBRARY_DL="$LIBS";LIBS=""])
+AC_SUBST(LIBRARY_DL)
+
+PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 1.5.0)
+PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 1.5.0)
+PKG_CHECK_MODULES(LIBOSMOCTRL, libosmoctrl >= 1.5.0)
 PKG_CHECK_MODULES(LIBGTPNL, libgtpnl >= 1.2.0)
-PKG_CHECK_MODULES(LIBNFTABLES, libnftables >= 1.0.2)
+PKG_CHECK_MODULES(LIBNFTNL, libnftnl >= 1.1.9)
+PKG_CHECK_MODULES(LIBNFTABLES, libnftables >= 0.9.8)
 
 dnl checks for header files
 AC_HEADER_STDC
@@ -197,12 +201,20 @@ AM_CONFIG_HEADER(config.h)
 AC_OUTPUT(
     include/Makefile
     include/osmocom/Makefile
+    include/osmocom/gtlv/Makefile
+    include/osmocom/pfcp/Makefile
     include/osmocom/upf/Makefile
     src/Makefile
+    src/libosmo-gtlv/Makefile
+    src/libosmo-pfcp/Makefile
     src/osmo-upf/Makefile
     src/osmo-pfcp-tool/Makefile
     tests/Makefile
     tests/atlocal
+    tests/libosmo-gtlv/Makefile
+    tests/libosmo-gtlv/test_gtlv_gen/Makefile
+    tests/libosmo-gtlv/test_tliv/Makefile
+    tests/libosmo-pfcp/Makefile
     doc/Makefile
     doc/examples/Makefile
     doc/manuals/Makefile

contrib/jenkins.sh

@@ -30,32 +30,6 @@ export LD_LIBRARY_PATH="$inst/lib"
 export PATH="$inst/bin:$PATH"
 
 osmo-build-dep.sh libosmocore "" --disable-doxygen
-osmo-build-dep.sh libosmo-pfcp
-osmo-build-dep.sh libgtpnl
-
-# build libnftnl and libnftables from git.netfilter.org
-build_from_netfilter() {
-###  TODO: enable osmo-build-dep.sh to build from git.netfilter.org URL?
-	project="$1"
-	set +x
-	echo
-	echo
-	echo
-	echo " =============================== $project ==============================="
-	echo
-	set -x
-	if [ -d "./$project" ]; then
-		rm -rf "./$project"
-	fi
-	git clone "git://git.netfilter.org/$project" "$project"
-	cd "$project"
-	autoreconf --install --force
-	./configure --prefix="$inst/stow/$project" --without-cli --disable-man-doc
-	$MAKE install
-	STOW_DIR="$inst/stow" stow --restow $project
-}
-build_from_netfilter libnftnl
-build_from_netfilter nftables
 
 # Additional configure options and depends
 CONFIG=""

contrib/osmo-upf.spec.in

@@ -22,7 +22,7 @@ Release:        0
 Summary:        OsmoUPF: Osmocom User Plane Function
 License:        AGPL-3.0-or-later AND GPL-2.0-or-later
 Group:          Hardware/Mobile
-URL:            https://osmocom.org/projects/osmo-upf
+URL:            https://osmocom.org/projects/osmoupf
 Source:         %{name}-%{version}.tar.xz
 BuildRequires:  autoconf-archive
 BuildRequires:  automake >= 1.9
@@ -33,11 +33,9 @@ BuildRequires:  pkgconfig >= 0.20
 BuildRequires:  systemd-rpm-macros
 %endif
 BuildRequires:  pkgconfig(libgtpnl) >= 1.2.0
-BuildRequires:  pkgconfig(libnftables) >= 1.0.2
 BuildRequires:  pkgconfig(libosmocore) >= 1.6.0
 BuildRequires:  pkgconfig(libosmoctrl) >= 1.6.0
 BuildRequires:  pkgconfig(libosmovty) >= 1.6.0
-BuildRequires:  pkgconfig(libosmo-pfcp) >= 0.1.0
 BuildRequires:  pkgconfig(talloc)
 %{?systemd_requires}
 
@@ -79,12 +77,9 @@ make %{?_smp_mflags} check || (find . -name testsuite.log -exec cat {} +)
 %license COPYING
 %doc AUTHORS README.md
 %{_bindir}/osmo-upf
-%{_bindir}/osmo-pfcp-tool
 %dir %{_docdir}/%{name}/examples
 %dir %{_docdir}/%{name}/examples/osmo-upf
 %{_docdir}/%{name}/examples/osmo-upf/osmo-upf.cfg
-%{_docdir}/%{name}/examples/osmo-upf/osmo-upf-create-dev.cfg
-%{_docdir}/%{name}/examples/osmo-upf/osmo-upf-mockup.cfg
 %dir %{_sysconfdir}/osmocom
 %config(noreplace) %{_sysconfdir}/osmocom/osmo-upf.cfg
 %{_unitdir}/%{name}.service

debian/changelog

@@ -1,23 +0,0 @@
-osmo-upf (0.1.1) unstable; urgency=medium
-
-  [ Vadim Yanitskiy ]
-  * configure.ac: do not require unused dlopen
-  * Fix missing dash in Redmine project URL
-
-  [ Harald Welte ]
-  * add missing dependencies to libosmo-{gtlv,pfcp} to rpm + dpkg
-
-  [ Neels Hofmeyr ]
-  * add missing COPYING file
-  * debian,RPM,configure: fix packaging (deps etc)
-
-  [ Neels Janosch Hofmeyr ]
-  * configure: set libosmocore >= 1.6.0 like in packaging
-
- -- Neels Janosch Hofmeyr <nhofmeyr@sysmocom.de>  Wed, 24 Aug 2022 16:50:56 +0200
-
-osmo-upf (0.1.0) testing; urgency=low
-
-  Create new Debian package.
-
- -- Neels Hofmeyr <nhofmeyr@sysmocom.de>  Tue, 16 Aug 2022 23:17:05 +0200

debian/control

@@ -13,9 +13,7 @@ Build-Depends: debhelper (>=9),
                python3-minimal,
                libtalloc-dev,
                libgtpnl-dev (>= 1.2.0),
-               libnftables-dev (>= 1.0.2),
                libosmocore-dev (>= 1.6.0),
-               libosmo-pfcp-dev (>= 0.1.0),
                osmo-gsm-manuals-dev (>= 1.2.0)
 Standards-Version: 3.9.8
 Vcs-Git: git://git.osmocom.org/osmo-upf.git

doc/charts/Makefile.am

@@ -19,6 +19,10 @@ $(builddir)/%.png: $(srcdir)/%.msc
 $(builddir)/%.png: $(srcdir)/%.dot
 	dot -Tpng $< > $@
 
+$(srcdir)/%.msc: $(srcdir)/%.ladder
+	@which ladder_to_msc.py || (echo 'PLEASE POINT YOUR $$PATH AT libosmocore/contrib/ladder_to_msc.py' && false)
+	ladder_to_msc.py -i $< -o $@
+
 .PHONY: poll
 poll:
 	while true; do $(MAKE) msc dot; sleep 1; done

doc/charts/pfcp_msgs.ladder

@@ -0,0 +1,73 @@
+{hscale=1}
+upf = User Plane function
+cpf = Control Plane function
+
+cpf () .	Look up UPF,
+		pick any one of the available
+		IP addrs for the UPF
+
+...
+upf <> cpf	not yet associated
+upf () cpf	reject any session related msgs
+...
+
+upf < cpf	PFCP Association Setup Request
+		CP function Node Id, features
+upf > cpf	PFCP Association Setup Response
+		UP function Node Id, features
+upf <> cpf	associated
+upf () cpf	start Heartbeat checking
+...
+upf < cpf	Heartbeat Request
+upf > cpf	Heartbeat Response
+...
+upf > cpf	Heartbeat Request
+upf < cpf	Heartbeat Response
+...
+
+upf < cpf	Session Establishment Request
+		CP Node-Id
+		CP F-SEID
+		1+ Packet Detection Rule(s)
+		1+ Forward Action Rule(s)
+upf > cpf	Session Establishment Response
+
+upf < cpf	Session Modification Request
+upf > cpf	Session Modification Response
+
+upf < cpf	Session Deletion Request
+upf > cpf	Session Deletion Response
+
+...
+upf () cpf	F-SEID: accept any other IP addrs than peer's Node Id
+...
+
+---		Graceful release initiated by CP
+
+upf < cpf	Association Update Request
+		with PFCP Association Release Preparation Start = 1
+upf > cpf	Association Update Response
+upf > cpf	Session Report Request
+		to report non-zero usage reports,
+		at least one message per PFCP Session
+upf < cpf	Association Release Request
+upf > cpf	Association Release Response
+
+---		Graceful release initiated by UP
+
+upf > cpf	Association Update Request
+		with PFCP Association Release Preparation = 1
+cpf <> .	refrain from establishing sessions
+upf < cpf	Association Update Response
+upf < cpf	Session Deletion Request(s)
+		to collect usage reports
+		per session
+upf > cpf	Session Deletion Response(s)
+cpf () .	wait Graceful Release Period
+upf < cpf	Association Release Request
+upf > cpf	Association Release Response
+
+---		Release (immediate)
+
+upf < cpf	Association Release Request
+upf > cpf	Association Release Response

doc/charts/pfcp_msgs_gtp.ladder

@@ -0,0 +1,142 @@
+{hscale=1}
+sgsn =	SGSN
+	123.44.0.9
+sgwc =	SGW-C
+	123.44.0.5
+sgwu =	SGW-U
+	123.44.0.6
+pgwc =	PGW-C
+	123.44.0.7
+pgwu =	PGW-U
+	123.44.0.8
+
+sgsn <-> sgwc	S4-C GTPv2-C
+sgwc <-> sgwu	Sxa PFCP
+sgsn <-> sgwu	S4-U GTPv1-U
+sgwc <-> pgwc	S5-C GTPv2-C
+pgwc <-> pgwu	Sxb PFCP
+sgwu <-> pgwu	S5-U GTPv1-U
+
+...
+
+sgsn -> sgwc	GTP Create Session Request
+sgsn [] sgwc	F-TEID S11 = 123.44.0.9,0x004
+		F-TEID S5 = 123.44.0.7,0x000
+		PDN addr alloc = IPv4 192.168.100.2
+
+|||
+|||
+
+sgwc -> sgwu	PFCP Session Establishment Request
+sgwc [] sgwu	2x Create PDR
+		F-TEID = CHOOSE
+		FAR = NOCP,BUFF
+
+|||
+|||
+
+sgwc <- sgwu	PFCP Session Establishment Response
+sgwc [] sgwu	Created PDR F-TEID 123.44.0.6,0x015
+		Created PDR F-TEID 123.44.0.6,0x016
+
+|||
+|||
+
+sgwc -> pgwc	GTP Create Session Request
+sgwc [] pgwc	F-TEID S5 = 123.44.0.5,0x00b
+		PDN addr alloc = IPv4 192.168.100.2
+		Bearer Ctx: F-TEID S5 = 123.44.0.6,0x015
+
+|||
+|||
+
+pgwc -> pgwu	PFCP Session Establishment Request
+pgwc [] pgwu	Create PDR 1:
+		PDI: src-iface Core, UE IPv4 192.168.100.2
+		FAR-1: FORW, dst-iface Access,
+		hdr creation: GTP-U 123.44.0.6,0x015
+
+		Create PDR 2:
+		PDI: src-iface Access, F-TEID = CHOOSE id:05
+		hdr removal: GTP-U
+		FAR-2: FORW, dst-iface Core
+
+		Create PDR 3:
+		PDI: src-iface CP-function, F-TEID = CHOOSE
+		hdr removal: GTP-U
+		FAR-1
+
+		Create PDR 4:
+		PDI: src-iface Access, F-TEID = CHOOSE id:05, SDF Filter
+		hdr removal: GTP-U
+		FAR-3: FORW, dst-iface CP-Function,
+		hdr creation: GTP-U 123.44.0.7,0x00b
+
+|||
+
+pgwc <- pgwu	PFCP Session Establishment Response
+pgwc [] pgwu	Created PDR-1
+		Created PDR-2: F-TEID = 123.44.0.8,0x01e
+		Created PDR-3: F-TEID = 123.44.0.8,0x01f
+		Created PDR-4: F-TEID = 123.44.0.8,0x01e
+
+|||
+|||
+
+sgwc <- pgwc	GTP Create Session Response
+sgwc [] pgwc	TEID: 0x00b
+		F-TEID: 123.44.0.7,0x00b
+		PDN Addr: 192.168.100.2
+		Bearer Ctx: F-TEID S5 123.44.0.8,0x01e
+
+|||
+|||
+
+sgwc -> sgwu	PFCP Session Modification Request
+sgwc [] sgwu	Update FAR-2: FORW, dst-iface Core,
+		hdr creation GTP-U 123.44.0.8,0x01e
+
+|||
+
+sgwc <- sgwu	PFCP Session Modification Response
+
+|||
+|||
+
+sgsn <- sgwc	GTP Create Session Response
+sgsn [] sgwc	TEID: 0x004
+		F-TEID S11/S4: 123.44.0.5,0x007
+		F-TEID S5/S8: 123.44.0.7,0x00b
+		PDN Addr: 192.168.100.2
+		Bearer Ctx:
+		F-TEID S1-U: 123.44.0.6,0x016
+		F-TEID S5/S8: 123.44.0.8,0x01e
+
+|||
+|||
+
+sgsn -> sgwc	GTP Modify Bearer Request
+sgsn [] sgwc	TEID: 0x007
+		Bearer Ctx:
+		F-TEID S1-U: 192.168.104.167,0x32adb2ad
+
+|||
+|||
+
+sgwc -> sgwu	PFCP Session Modification Request
+sgwc [] sgwu	Update FAR-1: FORW, dst-iface Access,
+		hdr creation: GTP-U 192.168.104.167,0x32adb2ad
+
+|||
+|||
+
+
+sgwc <- sgwu	PFCP Session Modification Response
+
+|||
+
+sgsn <- sgwc	GTP Modify Bearer Response
+sgsn [] sgwc	TEID: 0x004
+		Bearer Ctx:
+		F-TEID S1-U: 192.168.104.167,0x32adb2ad
+

doc/examples/osmo-upf/osmo-upf-mockup.cfg

@@ -1,19 +0,0 @@
-log stderr
- logging filter all 1
- logging color 1
- logging print level 1
- logging print category 1
- logging print category-hex 0
- logging print file basename last
- logging print extended-timestamp 1
- logging level set-all debug
- logging level set-all notice
- logging level set-all info
-
-timer pfcp x24 5000
-pfcp
- local-addr 127.0.0.1
-gtp
- mockup
-nft
- mockup

include/osmocom/Makefile.am

@@ -1,3 +1,5 @@
 SUBDIRS = \
+	gtlv \
+	pfcp \
 	upf \
 	$(NULL)

include/osmocom/gtlv/Makefile.am

@@ -0,0 +1,7 @@
+tlv_HEADERS = \
+	gtlv.h \
+	gtlv_dec_enc.h \
+	gtlv_gen.h \
+	$(NULL)
+
+tlvdir = $(includedir)/osmocom/gtlv

include/osmocom/gtlv/gtlv.h

@@ -0,0 +1,157 @@
+/*
+ * (C) 2021-2022 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 <stdint.h>
+#include <stdio.h>
+#include <stdbool.h>
+
+struct msgb;
+struct osmo_gtlv_load;
+struct osmo_gtlv_put;
+struct value_string;
+
+struct osmo_gtlv_tag_inst {
+	unsigned int tag;
+	bool instance_present;
+	unsigned int instance;
+};
+
+int osmo_gtlv_tag_inst_cmp(const struct osmo_gtlv_tag_inst *a, const struct osmo_gtlv_tag_inst *b);
+
+int osmo_gtlv_tag_inst_to_str_buf(char *buf, size_t buflen, const struct osmo_gtlv_tag_inst *ti,
+				 const struct value_string *tag_names);
+char *osmo_gtlv_tag_inst_to_str_c(void *ctx, const struct osmo_gtlv_tag_inst *ti,
+				 const struct value_string *tag_names);
+
+/*! TL configuration for osmo_gtlv_load*() and osmo_gtlv_put*(). Depending on these implementations provided by the caller,
+ * osmo_gtlv can load any sizes of tag and length fields (that don't surpass the value range of unsigned int and size_t,
+ * respectively), as well as TV (fixed-length) or TvLV (variable-sized length).
+ *
+ * See osmo_t8l8v_cfg and osmo_t16l16v_cfg, ready implementations for plain 8bit and 16bit TLV protocols.
+ *
+ * libosmo-pfcp serves as example for using this entire TLV API, uncluding de/encoding to structs and generating parts
+ * of the TLV parsing code based on message definitions. It uses osmo_t16l16v_cfg.
+ */
+struct osmo_gtlv_cfg {
+	/*! The length in bytes of the shortest possible TL header (e.g. 4 for T16L16V, or 1 for 8bit tags where TV IEs
+	 * without a length exist). A src_data_len passed to store_tl() below is guaranteed to be >= this value. If at
+	 * any point there is remaining message data smaller than this value, a parsing error is returned.
+	 */
+	size_t tl_min_size;
+
+	/*! Read one TL from the start of src_data.
+	 * \param gtlv  Return the T (tag) value read from src_data in gtlv->tag.
+	 *             Return the L (length) value read from src_data in gtlv->len.
+	 *             Return the I (instance) value read from src_data in gtlv->len; ignore if there is no I.
+	 *             Return the position just after the TL in gtlv->*val. If there is V data, point at the start of the
+	 *             V data in src_data. If there is no V data, point at the byte just after the TL part in src_data.
+	 * \param src_data  Part of raw message being decoded.
+	 * \param src_data_len  Remaining message data length at src_data.
+	 * \return 0 on success, negative on error.
+	 */
+	int (*load_tl)(struct osmo_gtlv_load *gtlv, const uint8_t *src_data, size_t src_data_len);
+
+	/*! Write a TL to dst_data, and return the size of the TL written.
+	 * This is also invoked by osmo_gtlv_put_update_tl() to overwrite a previous TL header. If the TL part's size
+	 * can be different than the first time (e.g. due to a large L value in a TvLV protocol), an implementation can
+	 * use the 'gtlv' arg to figure out how to memmove the message data:
+	 * When invoked by osmo_gtlv_put_tl(), dst_data == gtlv->dst->tail and dst_data_avail == msgb_tailroom().
+	 * When invoked by osmo_gtlv_put_update_tl(), dst_data < gtlv->dst->tail, dst_data points at the start of the
+	 * TL section written earlier by osmo_gtlv_put_tl() and dst_data_avail == the size of the TL written earlier.
+	 *
+	 * \param dst_data  Write TL data to the start of this buffer.
+	 * \param dst_data_avail  Remaining available space in dst_data.
+	 * \param tag  The T value to store in dst_data.
+	 * \param instance  The I value to store in dst_data (if this tag is a TLIV); ignore when not a TLIV.
+	 * \param len  The L value to store in dst_data.
+	 * \param gtlv  Backpointer to the osmo_gtlv_put struct, including gtlv->dst, the underlying msgb.
+	 * \return the size of the TL part in bytes on success, -EINVAL if tag is invalid, -EMSGSIZE if len is too large
+	 * or dst_data_avail is too small for the TL.
+	 */
+	int (*store_tl)(uint8_t *dst_data, size_t dst_data_avail, const struct osmo_gtlv_tag_inst *ti, size_t len,
+			struct osmo_gtlv_put *gtlv);
+};
+
+/*! Configuration that allows parsing an 8bit tag and 8bit length TLV. */
+extern const struct osmo_gtlv_cfg osmo_t8l8v_cfg;
+
+/*! Configuration that allows parsing a 16bit tag and 16bit length TLV (see for example PFCP). */
+extern const struct osmo_gtlv_cfg osmo_t16l16v_cfg;
+
+/*! State for loading a TLV structure from raw data. */
+struct osmo_gtlv_load {
+	/*! Caller-defined context pointer available for use by load_tl() and store_tl() implementations. */
+	void *priv;
+
+	/*! Definition of tag and length sizes (by function pointers). */
+	const struct osmo_gtlv_cfg *cfg;
+
+	/*! Overall message buffer being parsed. */
+	struct {
+		const uint8_t *data;
+		size_t len;
+	} src;
+
+	/*! Return value from last invocation of osmo_gtlv_load_next*(): tag value of parsed IE. */
+	struct osmo_gtlv_tag_inst ti;
+	/*! Return value from last invocation of osmo_gtlv_load_next*(): Start of the IE's payload data (after tag and
+	 * length). If the end of the src buffer is reached, val == NULL. If a TLV contained no value part, len == 0,
+	 * but this still points just after the TL. */
+	const uint8_t *val;
+	/*! Return value from last invocation of osmo_gtlv_load_next*(): Length of the IE's payload data (without tag and
+	 * length) */
+	size_t len;
+};
+
+/* Start or restart the gtlv from the first IE in the overall TLV data. */
+static inline void osmo_gtlv_load_start(struct osmo_gtlv_load *gtlv)
+{
+	gtlv->val = NULL;
+}
+
+int osmo_gtlv_load_next(struct osmo_gtlv_load *gtlv);
+int osmo_gtlv_load_peek_tag(const struct osmo_gtlv_load *gtlv, struct osmo_gtlv_tag_inst *ti);
+int osmo_gtlv_load_next_by_tag(struct osmo_gtlv_load *gtlv, unsigned int tag);
+int osmo_gtlv_load_next_by_tag_inst(struct osmo_gtlv_load *gtlv, const struct osmo_gtlv_tag_inst *ti);
+
+/* State for storing a TLV structure into a msgb. */
+struct osmo_gtlv_put {
+	/*! Caller-defined context pointer available for use by load_tl() and store_tl() implementations. */
+	void *priv;
+
+	/* Definition of tag and length sizes (by function pointers). */
+	const struct osmo_gtlv_cfg *cfg;
+
+	/* msgb to append new TL to */
+	struct msgb *dst;
+	/* What was the last TL written and where are its TL and V */
+	struct osmo_gtlv_tag_inst last_ti;
+	uint8_t *last_tl;
+	uint8_t *last_val;
+};
+
+int osmo_gtlv_put_tl(struct osmo_gtlv_put *gtlv, unsigned int tag, size_t len);
+int osmo_gtlv_put_tli(struct osmo_gtlv_put *gtlv, const struct osmo_gtlv_tag_inst *ti, size_t len);
+int osmo_gtlv_put_update_tl(struct osmo_gtlv_put *gtlv);

include/osmocom/gtlv/gtlv_dec_enc.h

@@ -0,0 +1,201 @@
+/* Decode and encode the value parts of a TLV structure */
+/*
+ * (C) 2021-2022 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 <stdbool.h>
+
+#include <osmocom/gtlv/gtlv.h>
+
+struct value_string;
+
+/* User defined function to decode a single TLV value part. See struct osmo_gtlv_coding.
+ * \param decoded_struct  Pointer to the root struct, as context information, e.g. for logging.
+ * \param decode_to  Pointer to the struct member, write the decoded value here.
+ * \param gtlv  TLV loader, pointing at a gtlv->val of gtlv->len bytes.
+ * \return 0 on success, nonzero on error, e.g. -EINVAL if the gtlv->val is invalid.
+ */
+typedef int (*osmo_gtlv_dec_func)(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv);
+
+/* User defined function to encode a single TLV value part. See struct osmo_gtlv_coding.
+ * \param gtlv  TLV writer, pointing at a gtlv->dst to msgb_put() data in.
+ * \param decoded_struct  Pointer to the root struct, as context information, e.g. for logging.
+ * \param encode_from  Pointer to the struct member, obtain the value to encode from here.
+ * \return 0 on success, nonzero on error, e.g. -EINVAL if encode_from has an un-encodable value.
+ */
+typedef int (*osmo_gtlv_enc_func)(struct osmo_gtlv_put *gtlv, const void *decoded_struct, const void *encode_from);
+
+/* Optional user defined function to convert a decoded IE struct (the Value part stored as C struct) to string. See
+ * struct osmo_gtlv_coding.
+ * \param buf  Return string in this buffer.
+ * \param buflen  Size of buf.
+ * \param str_of  Pointer to the struct member described by an osmo_gtlv_coding, obtain the value to encode from here.
+ * \return number of characters that would be written if the buffer is large enough, like snprintf().
+ */
+typedef int (*osmo_gtlv_enc_to_str_func)(char *buf, size_t buflen, const void *str_of);
+
+/* Whether TLV structures nested inside the value data of an outer IE should be parsed in the same order. */
+enum osmo_gtlv_coding_nested_ies_ordered {
+	/*! When stepping into nested IEs, keep the same ordering requirement as the outer IE. */
+	OSMO_GTLV_NESTED_IES_ORDERING_SAME = 0,
+	/*! Require IEs in a PDU to appear exactly in the order defined by osmo_gtlv_coding arrays. Causes a parsing
+	 * failure if the TLVs appear in a different order. Does much less iterating looking for matching tags when
+	 * decoding (faster). */
+	OSMO_GTLV_NESTED_IES_ORDERED,
+	/*! Do not require IEs to be in the defined order in decoded PDUs. When encoding a TLV, IEs will always be
+	 * encoded in the order they are defined. This has an effect on decoding only. */
+	OSMO_GTLV_NESTED_IES_UNORDERED,
+};
+
+#define OSMO_ARRAY_PITCH(arr) ((char *)(&(arr)[1]) - (char *)(arr))
+#define OSMO_MEMB_ARRAY_PITCH(obj_type, arr_memb) OSMO_ARRAY_PITCH(((obj_type *)0)->arr_memb)
+
+/*! Definition of how to decode/encode a IE to/from a struct.
+ * Kept in lists describing TLV structures, and nestable.
+ *
+ * Instance lists of this can be composed manually, or auto-generated using gtlv_gen.c. Auto-generating has the benefit
+ * that the decoded structs to match the IEs are also generated at the same time and thus always match the message
+ * definitions. For an example, see tests/libosmo-gtlv/test_gtlv_gen/. */
+struct osmo_gtlv_coding {
+	/*! the IEI discriminator, and optional instance number */
+	struct osmo_gtlv_tag_inst ti;
+
+	/*! Decoding function callback. Invoked for each defined and present IE encountered in the message.
+	 * Return 0 on success, negative on failure. */
+	osmo_gtlv_dec_func dec_func;
+	/*! Encoding function callback. Invoked for each defined and present IE encountered in the message.
+	 * Return 0 on success, negative on failure. */
+	osmo_gtlv_enc_func enc_func;
+
+	/*! Means to output the decoded value to a human readable string, optional. */
+	osmo_gtlv_enc_to_str_func enc_to_str_func;
+
+	/*! offsetof(decoded_struct_type, member_var): how far into the base struct you find a specific field for decoded
+	 * value. For example, memb_ofs = offsetof(struct foo_msg, ies.bar_response.cause).
+	 * When decoding, the decoded value is written here, when encoding it is read from here. */
+	unsigned int memb_ofs;
+	/*! For repeated IEs (.has_count = true), the array pitch / the offset to add to get to the next array index. */
+	unsigned int memb_array_pitch;
+
+	/*! True for optional/conditional IEs. */
+	bool has_presence_flag;
+	/* For optional/conditional IEs (has_presence_flag = true), the offset of the bool foo_present flag,
+	 * For example, if there are
+	 *
+	 * struct foo_msg {
+	 *         struct baz baz;
+	 *         bool baz_present;
+	 * };
+	 *
+	 * then set
+	 * memb_ofs = offsetof(struct foo_msg, baz);
+	 * has_presence_flag = true;
+	 * presence_flag_ofs = offsetof(struct foo_msg, baz_present);
+	 */
+	unsigned int presence_flag_ofs;
+
+	/*! True for repeated IEs, for array members:
+	 *
+	 * struct foo_msg {
+	 *         struct moo moo[10];
+	 *         unsigned int moo_count;
+	 * };
+	 *
+	 * memb_ofs = offsetof(struct foo_msg, moo);
+	 * has_count = true;
+	 * count_ofs = offsetof(struct foo_msg, moo_count);
+	 * count_max = 10;
+	 */
+	bool has_count;
+	/*! For repeated IEs, the offset of the unsigned int foo_count indicator of how many array indexes are
+	 * in use. See has_count. */
+	unsigned int count_ofs;
+	/*! Maximum array size for member_var[]. See has_count. */
+	unsigned int count_max;
+	/*! If nonzero, it is an error when less than this amount of the repeated IE have been decoded. */
+	unsigned int count_mandatory;
+
+	/*! For nested TLVs: if this IE's value part is itself a separate TLV structure, point this at the list of IE
+	 * coding definitions for the inner IEs.
+	 * In this example, the nested IEs decode/encode to different sub structs depending on the tag value.
+	 *
+	 *     struct bar {
+	 *             int aaa;
+	 *             int bbb;
+	 *     };
+	 *
+	 *     struct foo_msg {
+	 *             struct bar bar;
+	 *             struct bar other_bar;
+	 *     };
+	 *
+	 *     struct osmo_gtlv_coding bar_nested_ies[] = {
+	 *             { FOO_IEI_AAA, .memb_ofs = offsetof(struct bar, aaa), },
+	 *             { FOO_IEI_BBB, .memb_ofs = offsetof(struct bar, bbb), },
+	 *             {}
+	 *     };
+	 *
+	 *     struct osmo_gtlv_coding foo_msg_ies[] = {
+	 *             { FOO_IEI_GOO, .memb_ofs = offsetof(struct foo_msg, bar), .nested_ies = bar_nested_ies, },
+	 *             { FOO_IEI_OTHER_GOO, .memb_ofs = offsetof(struct foo_msg, other_bar), .nested_ies = bar_nested_ies, },
+	 *             {}
+	 *     };
+	 */
+	const struct osmo_gtlv_coding *nested_ies;
+
+	/*! If the nested TLV has a different tag/length size than the outer TLV structure, provide a different config
+	 * here. If they are the same, just keep this NULL. */
+	const struct osmo_gtlv_cfg *nested_ies_cfg;
+
+	/*! When stepping into nested IEs, what is the ordering requirement for the nested TLV structure? */
+	enum osmo_gtlv_coding_nested_ies_ordered nested_ies_ordered;
+};
+
+
+/*! User defined hook for error logging during TLV and value decoding.
+ * \param decoded_struct  Pointer to the base struct describing this message, for context.
+ * \param file  Source file of where the error occurred.
+ * \param line  Source file line of where the error occurred.
+ * \param fmt  Error message string format.
+ * \param ...  Error message string args.
+ */
+typedef void (*osmo_gtlv_err_cb)(void *data, void *decoded_struct, const char *file, int line, const char *fmt, ...);
+
+int osmo_gtlvs_decode(void *decoded_struct, unsigned int obj_ofs, struct osmo_gtlv_load *gtlv, bool tlv_ordered,
+		     const struct osmo_gtlv_coding *ie_coding,
+		     osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs);
+
+int osmo_gtlvs_encode(struct osmo_gtlv_put *gtlv, const void *decoded_struct, unsigned int obj_ofs,
+		     const struct osmo_gtlv_coding *ie_coding,
+		     osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs);
+
+int osmo_gtlvs_encode_to_str_buf(char *buf, size_t buflen, const void *decoded_struct, unsigned int obj_ofs,
+				const struct osmo_gtlv_coding *ie_coding, const struct value_string *iei_strs);
+char *osmo_gtlvs_encode_to_str_c(void *ctx, const void *decoded_struct, unsigned int obj_ofs,
+				const struct osmo_gtlv_coding *ie_coding, const struct value_string *iei_strs);
+
+static inline bool osmo_gtlv_coding_end(const struct osmo_gtlv_coding *iec)
+{
+	return iec->dec_func == NULL && iec->enc_func == NULL && iec->nested_ies == NULL;
+}

include/osmocom/gtlv/gtlv_gen.h

@@ -0,0 +1,176 @@
+/* Write h and c source files for TLV protocol definitions, based on very sparse TLV definitions.
+ * For a usage example see tests/libosmo-gtlv/test_gtlv_gen/. */
+/*
+ * (C) 2021-2022 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 <stdbool.h>
+
+struct osmo_gtlv_gen_ie;
+
+/* O means optional, M means mandatory.
+ * If all of the IE struct, tag name and functions can be derived from the name, just pass osmo_gtlv_gen_ie_auto as
+ * TLV_GEN_IE. */
+#define OSMO_GTLV_GEN_O(TLV_GEN_IE, MEMB_NAME) { MEMB_NAME, .optional = true, .ie = &(TLV_GEN_IE) }
+#define OSMO_GTLV_GEN_M(TLV_GEN_IE, MEMB_NAME) { MEMB_NAME, .ie = &(TLV_GEN_IE) }
+#define OSMO_GTLV_GEN_O_MULTI(MAX, TLV_GEN_IE, MEMB_NAME) { MEMB_NAME, .multi = MAX, .ie = &(TLV_GEN_IE) }
+#define OSMO_GTLV_GEN_M_MULTI(MAX, MAND_COUNT, TLV_GEN_IE, MEMB_NAME) \
+	{ MEMB_NAME, .multi = MAX, .multi_mandatory = MAND_COUNT, .ie = &(TLV_GEN_IE) }
+#define OSMO_GTLV_GEN_O_INST(INSTANCE, TLV_GEN_IE, MEMB_NAME) { MEMB_NAME, .optional = true, .instance = INSTANCE, .ie = &TLV_GEN_IE }
+#define OSMO_GTLV_GEN_M_INST(INSTANCE, TLV_GEN_IE, MEMB_NAME) { MEMB_NAME, .instance = INSTANCE, .ie = &(TLV_GEN_IE) }
+
+#define OSMO_GTLV_GEN_NO_INSTANCE INT_MAX
+
+/*! osmo_gtlv_gen_ie with all members == NULL, so that all are derived from the member name. */
+extern const struct osmo_gtlv_gen_ie osmo_gtlv_gen_ie_auto;
+
+/*! Modifier for Mandatory/Optional/Multiple around an osmo_gtlv_gen_ie. */
+struct osmo_gtlv_gen_ie_o {
+	/*! The C name of the member in a decoded struct, to be of the type defined by .ie.
+	 * All parts of .ie, if NULL, are derived from this name.
+	 *
+	 * For example, simply this
+	 *
+	 *   struct osmo_gtlv_gen_ie_o foo[] = {
+	 *       OSMO_GTLV_GEN_O("bar", NULL),
+	 *   };
+	 *
+	 * Generates
+	 *
+	 *   struct myproto_msg_foo {
+	 *       struct myproto_ie_bar bar;
+	 *   }
+	 *
+	 * and an osmo_gtlv_coding entry of
+	 *
+	 * { MYPROTO_IEI_BAR,
+	 *   .memb_ofs = offsetof(struct myproto_msg_foo, bar),
+	 *   .dec_func = myproto_dec_bar,
+	 *   .enc_func = myproto_enc_bar,
+	 *   .enc_to_str_func = myproto_enc_to_str_bar,
+	 * }
+	 *
+	 * See also osmo_gtlv_gen_cfg.add_enc_to_str.
+	 */
+	const char *name;
+
+	/*! Whether to add a bool foo_present, and to skip encoding/decoding if false.
+	 * Only useful for non-multi IEs (compare OSMO_GTLV_GEN_O_MULTI() vs OSMO_GTLV_GEN_M_MULTI()). */
+	bool optional;
+
+	/*! If non-NULL, the member is an array: foo[123] with an unsigned int foo_count.
+	 * Set to the maximum number of array elements; for foo[123] set .multi = 123. */
+	unsigned int multi;
+	/*! Number of mandatory occurences of the IE, only has an effect if .multi > 0. */
+	unsigned int multi_mandatory;
+
+	/* If any, the instance nr to match, in C that yields an unsigned int.
+	 * e.g. "1" or "MYPROTO_FOO_INST_ONE". */
+	const char *instance;
+
+	/*! IE decoding / encoding instructions. If NULL, the entire IE definition is derived from .name.
+	 * 'MYPROTO_IEI_NAME', 'myproto_dec_name()', 'myproto_enc_name()', 'myproto_enc_to_str_name()'.
+	 * Your myproto_ies_custom.h needs to define an enum value MYPROTO_IEI_NAME and*/
+	const struct osmo_gtlv_gen_ie *ie;
+};
+
+/*! Define decoding and encoding of a single IE, i.e. one full TLV. */
+struct osmo_gtlv_gen_ie {
+	/*! like "uint32_t" or "struct foo".
+	 * If NULL, use "struct myproto_ie_<name>" instead, where <name> comes from the osmo_gtlv_gen_ie_o.
+	 * When there are nested IEs, the struct definition is auto-generated, deriving the struct members from the
+	 * nested_ies list.
+	 * When there are no nested IEs, the type needs to be defined manually by a myproto_ies_custom.h. */
+	const char *decoded_type;
+
+	/*! C name of this tag value, e.g. "foo" to use tag "MYPROTO_IEI_FOO".
+	 * If NULL, take "MYPROTO_IEI_"+upper(memb_name) instead, where memb_name comes from the osmo_gtlv_gen_ie_o.
+	 * decoded_type and/or dec_enc may be derived from this, if they are NULL. */
+	const char *tag_name;
+
+	/*! Name suffix of the dec/enc functions. "foo" -> myproto_dec_foo(), myproto_enc_foo(),
+	 * myproto_enc_to_str_foo().
+	 * These functions need to be implemented manually in a myproto_ies_custom.c.
+	 * When osmo_gtlv_gen_cfg.add_enc_to_str is false, the myproto_enc_to_str_foo() is not required. */
+	const char *dec_enc;
+
+	/*! List of inner IEs terminated by {}. If non-NULL, this is a "Grouped IE" with an inner TLV structure inside
+	 * this IE's V part. */
+	const struct osmo_gtlv_gen_ie_o *nested_ies;
+
+	/*! To place a spec comment in the generated code. */
+	const char *spec_ref;
+};
+
+/*! General TLV decoding and encoding definitions applying to all IEs (and nested IEs). */
+struct osmo_gtlv_gen_cfg {
+	/*! Name of the protocol for use in C type or function names, like "myproto". */
+	const char *proto_name;
+
+	/*! When placing comments to spec references, prefix with this. For example, "3GPP TS 12.345 ". */
+	const char *spec_ref_prefix;
+
+	/*! The type to pass a message discriminator as, like 'enum myproto_message_types' */
+	const char *message_type_enum;
+	/*! To reference a message type discriminator like MYPROTO_MSGT_FOO, this would be "MYPROTO_MSGT_". */
+	const char *message_type_prefix;
+
+	/*! Type to use to represent tag IEI in decoded form.
+	 * For example "enum foo_msg_iei". */
+	const char *tag_enum;
+	/*! The tag IEI enum value is uppercase(tag_prefix + (iedef->tag_name or iedef->name)).
+	 * For example, with tag_prefix = "OSMO_FOO_IEI_", we would generate code like
+	 * enum osmo_foo_iei tag = OSMO_FOO_IEI_BAR; */
+	const char *tag_prefix;
+
+	/*! When an osmo_gtlv_gen_ie provides no decoded_type string, it is derived from .name and this prefix is
+	 * added. For example, with decoded_type_prefix = "struct foo_ie_", the decoded_type defaults to
+	 * struct foo_ie_bar for an IE definition with name = "bar". */
+	const char *decoded_type_prefix;
+
+	/*! To include user defined headers, set to something like "#include <osmocom/foo/foo_tlv_devs.h". This is put at
+	 * the head of the generated .h file. */
+	const char *h_header;
+
+	/*! To include user defined headers, set to something like "#include <osmocom/foo/foo_msg.h". This is put at
+	 * the head of the generated .c file. */
+	const char *c_header;
+
+	/*! Array of message IE definitions, indexed by message type. */
+	const struct osmo_gtlv_gen_msg *msg_defs;
+
+	/*! Whether to add to_str functions. When true, every automatically derived IE (that has no nested IEs) needs to
+	 * have a myproto_enc_to_str_foo() defined by a myproto_ies_custom.c. When false, osmo_gtlvs_encode_to_str_buf()
+	 * will print '?' instead of the IE contents. */
+	bool add_enc_to_str;
+};
+
+/*! For generating the outer union that composes a protocol's PDU variants, an entry of the list of message names and
+ * IEs in each message. */
+struct osmo_gtlv_gen_msg {
+	const char *name;
+	const struct osmo_gtlv_gen_ie_o *ies;
+};
+
+int osmo_gtlv_gen_main(const struct osmo_gtlv_gen_cfg *cfg, int argc, const char **argv);

include/osmocom/pfcp/Makefile.am

@@ -0,0 +1,25 @@
+pfcp_HEADERS = \
+	pfcp_endpoint.h \
+	pfcp_heartbeat_fsm.h \
+	pfcp_ies_custom.h \
+	pfcp_msg.h \
+	pfcp_proto.h \
+	pfcp_strs.h \
+	$(NULL)
+
+pfcpdir = $(includedir)/osmocom/pfcp
+
+BUILT_SOURCES = \
+	pfcp_ies_auto.h \
+	$(NULL)
+
+CLEANFILES = \
+	pfcp_ies_auto.h \
+	$(NULL)
+
+pfcp_ies_auto.h: $(top_srcdir)/src/libosmo-pfcp/gen__pfcp_ies_auto.c \
+		 $(top_srcdir)/src/libosmo-gtlv/gtlv_gen.c \
+		 $(top_srcdir)/include/osmocom/gtlv/gtlv_gen.h
+	$(MAKE) -C $(top_builddir)/src/libosmo-gtlv
+	$(MAKE) -C $(top_builddir)/src/libosmo-pfcp gen__pfcp_ies_auto
+	$(top_builddir)/src/libosmo-pfcp/gen__pfcp_ies_auto h > $(builddir)/pfcp_ies_auto.h

include/osmocom/pfcp/pfcp_endpoint.h

@@ -0,0 +1,100 @@
+/*
+ * (C) 2021-2022 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 <osmocom/core/socket.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/tdef.h>
+
+#include <osmocom/pfcp/pfcp_msg.h>
+
+struct osmo_pfcp_endpoint;
+struct osmo_fsm_inst;
+
+#define OSMO_PFCP_TIMER_T1 -22
+#define OSMO_PFCP_TIMER_N1 -23
+#define OSMO_PFCP_TIMER_KEEP_RESP -24
+
+extern struct osmo_tdef osmo_pfcp_tdefs[];
+
+typedef void (*osmo_pfcp_endpoint_cb)(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m);
+
+/* Send/receive PFCP messages to/from remote PFCP endpoints. */
+struct osmo_pfcp_endpoint {
+	struct {
+		/* Local address */
+		struct osmo_sockaddr local_addr;
+		/* Local PFCP Node ID, as sent in outgoing messages' Node ID IE */
+		struct osmo_pfcp_ie_node_id local_node_id;
+
+		/* Timer definitions to use, if any. See t1_ms, keep_resp_ms. Use osmo_pfcp_tdefs by default. It is
+		 * convenient to add osmo_pfcp_tdefs as one of your program's osmo_tdef_group entries and call
+		 * osmo_tdef_vty_init() to expose PFCP timers on the VTY. */
+		const struct osmo_tdef *tdefs;
+	} cfg;
+
+	/* PFCP socket */
+	struct osmo_fd pfcp_fd;
+
+	/* The time at which this endpoint last restarted, as seconds since unix epoch. */
+	uint32_t recovery_time_stamp;
+
+	/* State for determining the next sequence number for transmitting a request message */
+	uint32_t seq_nr_state;
+
+	/* Callback to enrich the osmo_pfcp_msg->ctx information before decoding, for logging context.
+	 * The osmo_pfcp_msg argument will have a ctx.remote set. The header and IEs may or may not be parsed yet:
+	 * This function is called twice:
+	 * - just after receiving, before decoding; ctx.remote is set.
+	 * - just after decoding the message header; ctx.remote is set and the header is decoded.
+	 * This function may set ctx.peer_fi and ctx.session_fi, used for logging context during message decoding.
+	 * The caller may also use these fi pointers to reduce lookup iterations.
+	 */
+	osmo_pfcp_endpoint_cb set_msg_ctx;
+
+	/* Callback to receive single incoming PFCP messages from a remote peer, already decoded. */
+	osmo_pfcp_endpoint_cb rx_msg;
+
+	/* application-private data */
+	void *priv;
+
+	/* All transmitted messages that are still pending, list of osmo_pfcp_queue_entry.
+	 * For a transmitted Request message, wait for a matching Response from a remote peer; if none arrives,
+	 * retransmit (see n1 and t1_ms).
+	 * For a transmitted Response message, keep it in the queue for a fixed amount of time. If the peer retransmits
+	 * the original Request, do not dispatch the Request, but respond with the queued message directly.
+	 */
+	struct llist_head retrans_queue;
+};
+
+struct osmo_pfcp_endpoint *osmo_pfcp_endpoint_create(void *ctx, void *priv);
+int osmo_pfcp_endpoint_bind(struct osmo_pfcp_endpoint *ep);
+void osmo_pfcp_endpoint_close(struct osmo_pfcp_endpoint *ep);
+void osmo_pfcp_endpoint_free(struct osmo_pfcp_endpoint **ep);
+
+uint32_t osmo_pfcp_endpoint_next_seq_nr(struct osmo_pfcp_endpoint *ep);
+
+int osmo_pfcp_endpoint_tx(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m);
+int osmo_pfcp_endpoint_tx_data(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m);
+int osmo_pfcp_endpoint_tx_heartbeat_req(struct osmo_pfcp_endpoint *ep, const struct osmo_sockaddr *remote_addr);

include/osmocom/pfcp/pfcp_heartbeat_fsm.h

@@ -0,0 +1,40 @@
+/*
+ * (C) 2021-2022 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
+
+struct osmo_fsm_inst;
+struct osmo_tdef;
+
+enum osmo_pfcp_heartbeat_fsm_event {
+	/* Dispatch this with a struct osmo_pfcp_msg* as data argument whenever a Heartbeat Response matching this
+	 * instance is received. Typically a PFCP Peer responds to a request sent from here. */
+	OSMO_PFCP_HEARTBEAT_EV_RX_RESP,
+	/* Dispatch this with a struct osmo_pfcp_msg* as data argument whenever a Heartbeat Request matching this
+	 * instance is received. Typically a PFCP Peer on its own accord sent a Heartbeat Request. */
+	OSMO_PFCP_HEARTBEAT_EV_RX_REQ,
+};
+
+struct osmo_fsm_inst *osmo_pfcp_heartbeat_alloc(struct osmo_fsm_inst *parent_fi,
+						uint32_t parent_event_tx_heartbeat, uint32_t parent_event_term,
+						struct osmo_tdef *tdefs);

include/osmocom/pfcp/pfcp_ies_custom.h

@@ -0,0 +1,163 @@
+/* Definitions for decoded PFCP IEs, to be used by the auto-generated pfcp_ies_auto.c. */
+/*
+ * (C) 2021-2022 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 <osmocom/core/socket.h>
+
+#include <osmocom/pfcp/pfcp_proto.h>
+
+/* Common pattern used in various PFCP IEs. */
+struct osmo_pfcp_ip_addrs {
+	bool v4_present;
+	struct osmo_sockaddr v4;
+	bool v6_present;
+	struct osmo_sockaddr v6;
+};
+
+int osmo_pfcp_ip_addrs_set(struct osmo_pfcp_ip_addrs *dst, const struct osmo_sockaddr *addr);
+
+/* 3GPP TS 29.244 8.2.38, IETF RFC 1035 3.1 */
+struct osmo_pfcp_ie_node_id {
+	enum osmo_pfcp_node_id_type type;
+	union {
+		struct osmo_sockaddr ip;
+		/* Fully qualified domain name in "dot" notation ("host.example.com") */
+		char fqdn[254];
+	};
+};
+
+bool osmo_pfcp_bits_get(const uint8_t *bits, unsigned int bitpos);
+void osmo_pfcp_bits_set(uint8_t *bits, unsigned int bitpos, bool val);
+int osmo_pfcp_bits_to_str_buf(char *buf, size_t buflen, const uint8_t *bits, const struct value_string *bit_strs);
+char *osmo_pfcp_bits_to_str_c(void *ctx, const uint8_t *bits, const struct value_string *bit_str);
+
+/* 3GPP TS 29.244 8.2.25
+ * Usage:
+ *     struct osmo_pfcp_ie_up_function_features x;
+ *     osmo_pfcp_bits_set(x.bits, OSMO_PFCP_UP_FEAT_BUNDL, true);
+ *     if (osmo_pfcp_bits_get(x.bits, OSMO_PFCP_UP_FEAT_BUNDL))
+ *             foo();
+ *     printf("%s\n", osmo_pfcp_bits_to_str_c(x.bits, osmo_pfcp_up_feature_strs));
+ */
+struct osmo_pfcp_ie_up_function_features {
+	uint8_t bits[6];
+};
+
+/* 3GPP TS 29.244 8.2.58
+ *     struct osmo_pfcp_ie_cp_function_features x;
+ *     osmo_pfcp_bits_set(x.bits, OSMO_PFCP_CP_FEAT_BUNDL, true);
+ *     if (osmo_pfcp_bits_get(x.bits, OSMO_PFCP_CP_FEAT_BUNDL))
+ *             foo();
+ *     printf("%s\n", osmo_pfcp_bits_to_str_c(x.bits, osmo_pfcp_cp_feature_strs));
+ */
+struct osmo_pfcp_ie_cp_function_features {
+	uint8_t bits[3];
+};
+
+/* 3GPP TS 29.244 8.2.37 */
+struct osmo_pfcp_ie_f_seid {
+	uint64_t seid;
+	struct osmo_pfcp_ip_addrs ip_addr;
+};
+
+void osmo_pfcp_ie_f_seid_set(struct osmo_pfcp_ie_f_seid *f_seid, uint64_t seid,
+			     const struct osmo_sockaddr *remote_addr);
+
+/* 3GPP TS 29.244 8.3.2 */
+struct osmo_pfcp_ie_f_teid {
+	bool choose_flag;
+	union {
+		struct {
+			uint32_t teid;
+			struct osmo_pfcp_ip_addrs ip_addr;
+		} fixed;
+		struct {
+			bool ipv4_addr;
+			bool ipv6_addr;
+			bool choose_id_present;
+			uint8_t choose_id;
+		} choose;
+	};
+};
+
+/* 3GPP TS 29.244 8.2.62 */
+struct osmo_pfcp_ie_ue_ip_address {
+	bool chv6;
+	bool chv4;
+	bool ip_is_destination;
+	struct osmo_pfcp_ip_addrs ip_addr;
+	bool ipv6_prefix_delegation_bits_present;
+	uint8_t ipv6_prefix_delegation_bits;
+	bool ipv6_prefix_length_present;
+	uint8_t ipv6_prefix_length;
+};
+
+/* 3GPP TS 29.244 8.2.26.
+ * Usage:
+ *     struct osmo_pfcp_ie_apply_action x;
+ *     osmo_pfcp_bits_set(x.bits, OSMO_PFCP_APPLY_ACTION_FORW, true);
+ *     if (osmo_pfcp_bits_get(x.bits, OSMO_PFCP_APPLY_ACTION_FORW))
+ *             foo();
+ *     printf("%s\n", osmo_pfcp_bits_to_str_c(x.bits, osmo_pfcp_apply_action_strs));
+ */
+struct osmo_pfcp_ie_apply_action {
+	uint8_t bits[2];
+};
+
+struct osmo_pfcp_ie_network_inst {
+	/* A domain name may have up to 253 characters; plus nul. */
+	char str[253+1];
+};
+
+struct osmo_pfcp_ie_activate_predefined_rules {
+	char str[256];
+};
+
+/* 3GPP TS 29.244 8.2.56 */
+struct osmo_pfcp_ie_outer_header_creation {
+	/* desc_bits Usage:
+	 *     osmo_pfcp_bits_set(x.desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_GTP_U_UDP_IPV4, true);
+	 *     if (osmo_pfcp_bits_get(x.desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_GTP_U_UDP_IPV4))
+	 *             foo();
+	 *     printf("%s\n", osmo_pfcp_bits_to_str_c(x.desc_bits, osmo_pfcp_outer_header_creation_strs));
+	 */
+	uint8_t desc_bits[2];
+	bool teid_present;
+	uint32_t teid;
+	struct osmo_pfcp_ip_addrs ip_addr;
+	bool port_number_present;
+	uint16_t port_number;
+	bool c_tag_present;
+	uint32_t c_tag;
+	bool s_tag_present;
+	uint32_t s_tag;
+};
+
+/* 3GPP TS 29.244 8.2.64. */
+struct osmo_pfcp_ie_outer_header_removal {
+	enum osmo_pfcp_outer_header_removal_desc desc;
+	bool gtp_u_extension_header_del_present;
+	uint8_t gtp_u_extension_header_del_bits[1];
+};

include/osmocom/pfcp/pfcp_msg.h

@@ -0,0 +1,165 @@
+/* PFCP message encoding and decoding */
+/*
+ * (C) 2021-2022 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 <stdint.h>
+#include <stdbool.h>
+#include <inttypes.h>
+
+#include <osmocom/core/socket.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/fsm.h>
+
+#include <osmocom/pfcp/pfcp_proto.h>
+#include <osmocom/pfcp/pfcp_ies_auto.h>
+#include <osmocom/pfcp/pfcp_strs.h>
+
+struct msgb;
+struct osmo_t16l16v_ie;
+
+#define OSMO_PFCP_MSGB_ALLOC_SIZE 2048
+
+#define OSMO_LOG_PFCP_MSG_SRC(M, LEVEL, file, line, FMT, ARGS...) do { \
+		struct osmo_fsm_inst *_fi = (M) ? ( (M)->ctx.session_fi ?: (M)->ctx.peer_fi ) : NULL; \
+		enum osmo_pfcp_cause *cause = osmo_pfcp_msg_cause(M); \
+		if ((M)->h.seid_present) { \
+			LOGPFSMSLSRC(_fi, DLPFCP, LEVEL, file, line, \
+				     "%s%s PFCP seq-%u SEID-0x%"PRIx64" %s%s%s: " FMT, \
+				     _fi ? "" : osmo_sockaddr_to_str_c(OTC_SELECT, &(M)->remote_addr), \
+				     (M)->rx ? "-rx->" : "<-tx-", (M)->h.sequence_nr, \
+				     (M)->h.seid, \
+				     osmo_pfcp_message_type_str((M)->h.message_type), cause ? ": " : "", \
+				     cause ? osmo_pfcp_cause_str(*cause) : "", ##ARGS); \
+		} else { \
+			LOGPFSMSLSRC(_fi, DLPFCP, LEVEL, file, line, \
+				     "%s%s PFCP seq-%u %s%s%s: " FMT, \
+				     _fi ? "" : osmo_sockaddr_to_str_c(OTC_SELECT, &(M)->remote_addr), \
+				     (M)->rx ? "-rx->" : "<-tx-", (M)->h.sequence_nr, \
+				     osmo_pfcp_message_type_str((M)->h.message_type), cause ? ": " : "", \
+				     cause ? osmo_pfcp_cause_str(*cause) : "", ##ARGS); \
+		} \
+	} while(0)
+
+#define OSMO_LOG_PFCP_MSG(M, LEVEL, FMT, ARGS...) \
+	OSMO_LOG_PFCP_MSG_SRC(M, LEVEL, __FILE__, __LINE__, FMT, ##ARGS)
+
+/* Return the next PFCP transmit sequence number based on the given sequence state var. */
+static inline uint32_t osmo_pfcp_next_seq(uint32_t *seq_state)
+{
+	(*seq_state)++;
+	(*seq_state) &= 0xffffff;
+	return *seq_state;
+}
+
+struct osmo_pfcp_header_parsed {
+	uint8_t version;
+	enum osmo_pfcp_message_type message_type;
+	uint32_t sequence_nr;
+	bool priority_present;
+	uint8_t priority;
+	bool seid_present;
+	uint64_t seid;
+};
+
+struct osmo_pfcp_msg {
+	/* Peer's remote address. Received from this peer, or should be sent to this peer. */
+	struct osmo_sockaddr remote_addr;
+	/* True when this message was received from a remote; false when this message is going to be sent. */
+	bool rx;
+	/* True when this message is a Response message type; false if Request. This is set by
+	 * osmo_pfcp_msg_decode() for received messages, and by osmo_pfcp_msg_alloc_tx */
+	bool is_response;
+
+	struct osmo_pfcp_header_parsed h;
+
+	int ofs_cause;
+	int ofs_node_id;
+
+	/* The union of decoded IEs from all supported PFCP message types.  The union and its structure is defined in
+	 * pfcp_ies_auto.h, which is generated by gen__pfcp_ies_auto.c.
+	 */
+	union osmo_pfcp_ies ies;
+
+	/* Context information about this message, used for logging */
+	struct {
+		/* Peer FSM instance that this message is received from / sent to. This can be set in the
+		 * osmo_pfcp_endpoint->set_msg_ctx() implementation, up to the caller. If present, this is used for
+		 * logging context, and can also be used by the caller to reduce lookup iterations. */
+		struct osmo_fsm_inst *peer_fi;
+		struct osmo_use_count *peer_use_count;
+		const char *peer_use_token;
+
+		/* Session FSM instance that this message is received from / sent to. This can be set in the
+		 * osmo_pfcp_endpoint->set_msg_ctx() implementation, up to the caller. If present, this is used for
+		 * logging context, and can also be used by the caller to reduce lookup iterations. */
+		struct osmo_fsm_inst *session_fi;
+		struct osmo_use_count *session_use_count;
+		const char *session_use_token;
+	} ctx;
+};
+
+#define OSMO_PFCP_MSG_FOR_IES(IES_P) ((struct osmo_pfcp_msg*)((char*)IES_P - offsetof(struct osmo_pfcp_msg, ies)))
+
+bool osmo_pfcp_msgtype_is_response(enum osmo_pfcp_message_type message_type);
+
+int osmo_pfcp_ie_f_teid_to_str_buf(char *buf, size_t len, const struct osmo_pfcp_ie_f_teid *ft);
+char *osmo_pfcp_ie_f_teid_to_str_c(void *ctx, const struct osmo_pfcp_ie_f_teid *ft);
+
+int osmo_pfcp_msg_encode(struct msgb *msg, const struct osmo_pfcp_msg *pfcp_msg);
+
+int osmo_pfcp_msg_decode_header(struct osmo_gtlv_load *tlv, struct osmo_pfcp_msg *m,
+				const struct msgb *msg);
+int osmo_pfcp_msg_decode_tlv(struct osmo_pfcp_msg *m, struct osmo_gtlv_load *tlv);
+
+struct osmo_pfcp_msg *osmo_pfcp_msg_alloc_rx(void *ctx, const struct osmo_sockaddr *remote_addr);
+struct osmo_pfcp_msg *osmo_pfcp_msg_alloc_tx(void *ctx, const struct osmo_sockaddr *remote_addr,
+					     const struct osmo_pfcp_ie_node_id *local_node_id,
+					     const struct osmo_pfcp_msg *in_reply_to,
+					     enum osmo_pfcp_message_type msg_type);
+
+void osmo_pfcp_msg_invalidate_ctx(struct osmo_pfcp_msg *m, struct osmo_fsm_inst *deleted_fi);
+
+void osmo_pfcp_msg_free(struct osmo_pfcp_msg *m);
+
+int osmo_pfcp_ie_node_id_from_osmo_sockaddr(struct osmo_pfcp_ie_node_id *node_id, const struct osmo_sockaddr *os);
+int osmo_pfcp_ie_node_id_to_osmo_sockaddr(const struct osmo_pfcp_ie_node_id *node_id, struct osmo_sockaddr *os);
+
+#define OSMO_PFCP_MSG_MEMB(M, OFS) ((OFS) <= 0 ? NULL : (void*)((uint8_t*)(M) + OFS))
+
+static inline enum osmo_pfcp_cause *osmo_pfcp_msg_cause(const struct osmo_pfcp_msg *m)
+{
+	return OSMO_PFCP_MSG_MEMB(m, m->ofs_cause);
+}
+
+static inline struct osmo_pfcp_ie_node_id *osmo_pfcp_msg_node_id(const struct osmo_pfcp_msg *m)
+{
+	return OSMO_PFCP_MSG_MEMB(m, m->ofs_node_id);
+}
+
+int osmo_pfcp_ie_f_seid_cmp(const struct osmo_pfcp_ie_f_seid *a, const struct osmo_pfcp_ie_f_seid *b);
+void osmo_pfcp_ie_f_seid_set_addr(struct osmo_pfcp_ie_f_seid *f_seid, const struct osmo_sockaddr *addr);
+
+int osmo_pfcp_msg_to_str_buf(char *buf, size_t buflen, const struct osmo_pfcp_msg *m);
+char *osmo_pfcp_msg_to_str_c(void *ctx, const struct osmo_pfcp_msg *m);

include/osmocom/pfcp/pfcp_proto.h

@@ -0,0 +1,528 @@
+/* 3GPP TS 29.244: Packet Forwarding Control Protocol */
+/*
+ * (C) 2021-2022 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
+
+#define OSMO_PFCP_PORT 8805
+
+/* Section 7.3 / Table 7.3-1 */
+enum osmo_pfcp_message_type {
+	OSMO_PFCP_MSGT_NONE = 0,
+
+	/* Node related messages */
+	OSMO_PFCP_MSGT_HEARTBEAT_REQ = 1,
+	OSMO_PFCP_MSGT_HEARTBEAT_RESP = 2,
+	OSMO_PFCP_MSGT_PFD_MGMT_REQ = 3,
+	OSMO_PFCP_MSGT_PFD_MGMT_RESP = 4,
+	OSMO_PFCP_MSGT_ASSOC_SETUP_REQ = 5,
+	OSMO_PFCP_MSGT_ASSOC_SETUP_RESP = 6,
+	OSMO_PFCP_MSGT_ASSOC_UPDATE_REQ = 7,
+	OSMO_PFCP_MSGT_ASSOC_UPDATE_RESP = 8,
+	OSMO_PFCP_MSGT_ASSOC_RELEASE_REQ = 9,
+	OSMO_PFCP_MSGT_ASSOC_RELEASE_RESP = 10,
+	OSMO_PFCP_MSGT_VERSION_NOT_SUPP_RESP = 11,
+	OSMO_PFCP_MSGT_NODE_REPORT_REQ = 12,
+	OSMO_PFCP_MSGT_NODE_REPORT_RESP = 13,
+	OSMO_PFCP_MSGT_SESSION_SET_DEL_REQ = 14,
+	OSMO_PFCP_MSGT_SESSION_SET_DEL_RESP = 15,
+
+	/* Session related messages */
+	OSMO_PFCP_MSGT_SESSION_EST_REQ = 50,
+	OSMO_PFCP_MSGT_SESSION_EST_RESP = 51,
+	OSMO_PFCP_MSGT_SESSION_MOD_REQ = 52,
+	OSMO_PFCP_MSGT_SESSION_MOD_RESP = 53,
+	OSMO_PFCP_MSGT_SESSION_DEL_REQ = 54,
+	OSMO_PFCP_MSGT_SESSION_DEL_RESP = 55,
+	OSMO_PFCP_MSGT_SESSION_REP_REQ = 56,
+	OSMO_PFCP_MSGT_SESSION_REP_RESP = 57,
+};
+
+/* Section 8.1.2 / Table 8.1.2-1 */
+enum osmo_pfcp_iei {
+	OSMO_PFCP_INVALID_IEI = 0,
+	OSMO_PFCP_IEI_CREATE_PDR = 1,
+	OSMO_PFCP_IEI_PDI = 2,
+	OSMO_PFCP_IEI_CREATE_FAR = 3,
+	OSMO_PFCP_IEI_FORW_PARAMS = 4,
+	OSMO_PFCP_IEI_DUPL_PARAMS = 5,
+	OSMO_PFCP_IEI_CREATE_URR = 6,
+	OSMO_PFCP_IEI_CREATE_QER = 7,
+	OSMO_PFCP_IEI_CREATED_PDR = 8,
+	OSMO_PFCP_IEI_UPD_PDR = 9,
+	OSMO_PFCP_IEI_UPD_FAR = 10,
+	OSMO_PFCP_IEI_UPD_FORW_PARAMS = 11,
+	OSMO_PFCP_IEI_UPD_BAR_SESS_REP_RESP = 12,
+	OSMO_PFCP_IEI_UPD_URR = 13,
+	OSMO_PFCP_IEI_UPD_QER = 14,
+	OSMO_PFCP_IEI_REMOVE_PDR = 15,
+	OSMO_PFCP_IEI_REMOVE_FAR = 16,
+	OSMO_PFCP_IEI_REMOVE_URR = 17,
+	OSMO_PFCP_IEI_REMOVE_QER = 18,
+	OSMO_PFCP_IEI_CAUSE = 19,
+	OSMO_PFCP_IEI_SOURCE_IFACE = 20,
+	OSMO_PFCP_IEI_F_TEID = 21,
+	OSMO_PFCP_IEI_NETWORK_INST = 22,
+	OSMO_PFCP_IEI_SDF_FILTER = 23,
+	OSMO_PFCP_IEI_APPLICATION_ID = 24,
+	OSMO_PFCP_IEI_GATE_STATUS = 25,
+	OSMO_PFCP_IEI_MBR = 26,
+	OSMO_PFCP_IEI_GBR = 27,
+	OSMO_PFCP_IEI_QER_CORRELATION_ID = 28,
+	OSMO_PFCP_IEI_PRECEDENCE = 29,
+	OSMO_PFCP_IEI_TRANSPORT_LEVEL_MARKING = 30,
+	OSMO_PFCP_IEI_VOLUME_THRESH = 31,
+	OSMO_PFCP_IEI_TIME_THRESH = 32,
+	OSMO_PFCP_IEI_MONITORING_TIME = 33,
+	OSMO_PFCP_IEI_SUBSEQUENT_VOLUME_THRESH = 34,
+	OSMO_PFCP_IEI_SUBSEQUENT_TIME_THRESH = 35,
+	OSMO_PFCP_IEI_INACT_DETECTION_TIME = 36,
+	OSMO_PFCP_IEI_REPORTING_TRIGGERS = 37,
+	OSMO_PFCP_IEI_REDIRECT_INFO = 38,
+	OSMO_PFCP_IEI_REP_TYPE = 39,
+	OSMO_PFCP_IEI_OFFENDING_IE = 40,
+	OSMO_PFCP_IEI_FORW_POLICY = 41,
+	OSMO_PFCP_IEI_DESTINATION_IFACE = 42,
+	OSMO_PFCP_IEI_UP_FUNCTION_FEATURES = 43,
+	OSMO_PFCP_IEI_APPLY_ACTION = 44,
+	OSMO_PFCP_IEI_DL_DATA_SERVICE_INFO = 45,
+	OSMO_PFCP_IEI_DL_DATA_NOTIFICATION_DELAY = 46,
+	OSMO_PFCP_IEI_DL_BUFF_DURATION = 47,
+	OSMO_PFCP_IEI_DL_BUFF_SUGGESTED_PACKET_COUNT = 48,
+	OSMO_PFCP_IEI_PFCPSMREQ_FLAGS = 49,
+	OSMO_PFCP_IEI_PFCPSRRSP_FLAGS = 50,
+	OSMO_PFCP_IEI_LOAD_CTRL_INFO = 51,
+	OSMO_PFCP_IEI_SEQUENCE_NUMBER = 52,
+	OSMO_PFCP_IEI_METRIC = 53,
+	OSMO_PFCP_IEI_OVERLOAD_CTRL_INFO = 54,
+	OSMO_PFCP_IEI_TIMER = 55,
+	OSMO_PFCP_IEI_PDR_ID = 56,
+	OSMO_PFCP_IEI_F_SEID = 57,
+	OSMO_PFCP_IEI_APPLICATION_IDS_PFDS = 58,
+	OSMO_PFCP_IEI_PFD_CONTEXT = 59,
+	OSMO_PFCP_IEI_NODE_ID = 60,
+	OSMO_PFCP_IEI_PFD_CONTENTS = 61,
+	OSMO_PFCP_IEI_MEAS_METHOD = 62,
+	OSMO_PFCP_IEI_USAGE_REP_TRIGGER = 63,
+	OSMO_PFCP_IEI_MEAS_PERIOD = 64,
+	OSMO_PFCP_IEI_FQ_CSID = 65,
+	OSMO_PFCP_IEI_VOLUME_MEAS = 66,
+	OSMO_PFCP_IEI_DURATION_MEAS = 67,
+	OSMO_PFCP_IEI_APPLICATION_DETECTION_INFO = 68,
+	OSMO_PFCP_IEI_TIME_OF_FIRST_PACKET = 69,
+	OSMO_PFCP_IEI_TIME_OF_LAST_PACKET = 70,
+	OSMO_PFCP_IEI_QUOTA_HOLDING_TIME = 71,
+	OSMO_PFCP_IEI_DROPPED_DL_TRAFFIC_THRESH = 72,
+	OSMO_PFCP_IEI_VOLUME_QUOTA = 73,
+	OSMO_PFCP_IEI_TIME_QUOTA = 74,
+	OSMO_PFCP_IEI_START_TIME = 75,
+	OSMO_PFCP_IEI_END_TIME = 76,
+	OSMO_PFCP_IEI_QUERY_URR = 77,
+	OSMO_PFCP_IEI_USAGE_REP_SESS_MOD_RESP = 78,
+	OSMO_PFCP_IEI_USAGE_REP_SESS_DEL_RESP = 79,
+	OSMO_PFCP_IEI_USAGE_REP_SESS_REP_REQ = 80,
+	OSMO_PFCP_IEI_URR_ID = 81,
+	OSMO_PFCP_IEI_LINKED_URR_ID = 82,
+	OSMO_PFCP_IEI_DL_DATA_REP = 83,
+	OSMO_PFCP_IEI_OUTER_HEADER_CREATION = 84,
+	OSMO_PFCP_IEI_CREATE_BAR = 85,
+	OSMO_PFCP_IEI_UPD_BAR_SESS_MOD_REQ = 86,
+	OSMO_PFCP_IEI_REMOVE_BAR = 87,
+	OSMO_PFCP_IEI_BAR_ID = 88,
+	OSMO_PFCP_IEI_CP_FUNCTION_FEATURES = 89,
+	OSMO_PFCP_IEI_USAGE_INFO = 90,
+	OSMO_PFCP_IEI_APPLICATION_INST_ID = 91,
+	OSMO_PFCP_IEI_FLOW_INFO = 92,
+	OSMO_PFCP_IEI_UE_IP_ADDRESS = 93,
+	OSMO_PFCP_IEI_PACKET_RATE = 94,
+	OSMO_PFCP_IEI_OUTER_HEADER_REMOVAL = 95,
+	OSMO_PFCP_IEI_RECOVERY_TIME_STAMP = 96,
+	OSMO_PFCP_IEI_DL_FLOW_LEVEL_MARKING = 97,
+	OSMO_PFCP_IEI_HEADER_ENRICHMENT = 98,
+	OSMO_PFCP_IEI_ERROR_IND_REP = 99,
+	OSMO_PFCP_IEI_MEAS_INFO = 100,
+	OSMO_PFCP_IEI_NODE_REP_TYPE = 101,
+	OSMO_PFCP_IEI_USER_PLANE_PATH_FAILURE_REP = 102,
+	OSMO_PFCP_IEI_REMOTE_GTP_U_PEER = 103,
+	OSMO_PFCP_IEI_UR_SEQN = 104,
+	OSMO_PFCP_IEI_UPD_DUPL_PARAMS = 105,
+	OSMO_PFCP_IEI_ACTIVATE_PREDEFINED_RULES = 106,
+	OSMO_PFCP_IEI_DEACTIVATE_PREDEFINED_RULES = 107,
+	OSMO_PFCP_IEI_FAR_ID = 108,
+	OSMO_PFCP_IEI_QER_ID = 109,
+	OSMO_PFCP_IEI_OCI_FLAGS = 110,
+	OSMO_PFCP_IEI_PFCP_ASSOC_RELEASE_REQ = 111,
+	OSMO_PFCP_IEI_GRACEFUL_RELEASE_PERIOD = 112,
+	OSMO_PFCP_IEI_PDN_TYPE = 113,
+	OSMO_PFCP_IEI_FAILED_RULE_ID = 114,
+	OSMO_PFCP_IEI_TIME_QUOTA_MECHANISM = 115,
+	OSMO_PFCP_IEI_RESERVED = 116,
+	OSMO_PFCP_IEI_USER_PLANE_INACT_TIMER = 117,
+	OSMO_PFCP_IEI_AGGREGATED_URRS = 118,
+	OSMO_PFCP_IEI_MULTIPLIER = 119,
+	OSMO_PFCP_IEI_AGGREGATED_URR_ID = 120,
+	OSMO_PFCP_IEI_SUBSEQUENT_VOLUME_QUOTA = 121,
+	OSMO_PFCP_IEI_SUBSEQUENT_TIME_QUOTA = 122,
+	OSMO_PFCP_IEI_RQI = 123,
+	OSMO_PFCP_IEI_QFI = 124,
+	OSMO_PFCP_IEI_QUERY_URR_REFERENCE = 125,
+	OSMO_PFCP_IEI_ADDITIONAL_USAGE_REPS_INFO = 126,
+	OSMO_PFCP_IEI_CREATE_TRAFFIC_ENDPOINT = 127,
+	OSMO_PFCP_IEI_CREATED_TRAFFIC_ENDPOINT = 128,
+	OSMO_PFCP_IEI_UPD_TRAFFIC_ENDPOINT = 129,
+	OSMO_PFCP_IEI_REMOVE_TRAFFIC_ENDPOINT = 130,
+	OSMO_PFCP_IEI_TRAFFIC_ENDPOINT_ID = 131,
+	OSMO_PFCP_IEI_ETHERNET_PACKET_FILTER = 132,
+	OSMO_PFCP_IEI_MAC_ADDRESS = 133,
+	OSMO_PFCP_IEI_C_TAG = 134,
+	OSMO_PFCP_IEI_S_TAG = 135,
+	OSMO_PFCP_IEI_ETHERTYPE = 136,
+	OSMO_PFCP_IEI_PROXYING = 137,
+	OSMO_PFCP_IEI_ETHERNET_FILTER_ID = 138,
+	OSMO_PFCP_IEI_ETHERNET_FILTER_PROPERTIES = 139,
+	OSMO_PFCP_IEI_SUGGESTED_BUFF_PACKETS_COUNT = 140,
+	OSMO_PFCP_IEI_USER_ID = 141,
+	OSMO_PFCP_IEI_ETHERNET_PDU_SESS_INFO = 142,
+	OSMO_PFCP_IEI_ETHERNET_TRAFFIC_INFO = 143,
+	OSMO_PFCP_IEI_MAC_ADDRS_DETECTED = 144,
+	OSMO_PFCP_IEI_MAC_ADDRS_REMOVED = 145,
+	OSMO_PFCP_IEI_ETHERNET_INACT_TIMER = 146,
+	OSMO_PFCP_IEI_ADDITIONAL_MONITORING_TIME = 147,
+	OSMO_PFCP_IEI_EVENT_QUOTA = 148,
+	OSMO_PFCP_IEI_EVENT_THRESH = 149,
+	OSMO_PFCP_IEI_SUBSEQUENT_EVENT_QUOTA = 150,
+	OSMO_PFCP_IEI_SUBSEQUENT_EVENT_THRESH = 151,
+	OSMO_PFCP_IEI_TRACE_INFO = 152,
+	OSMO_PFCP_IEI_FRAMED_ROUTE = 153,
+	OSMO_PFCP_IEI_FRAMED_ROUTING = 154,
+	OSMO_PFCP_IEI_FRAMED_IPV6_ROUTE = 155,
+	OSMO_PFCP_IEI_TIME_STAMP = 156,
+	OSMO_PFCP_IEI_AVERAGING_WINDOW = 157,
+	OSMO_PFCP_IEI_PAGING_POLICY_INDICATOR = 158,
+	OSMO_PFCP_IEI_APN_DNN = 159,
+	OSMO_PFCP_IEI_3GPP_IFACE_TYPE = 160,
+	OSMO_PFCP_IEI_PFCPSRREQ_FLAGS = 161,
+	OSMO_PFCP_IEI_PFCPAUREQ_FLAGS = 162,
+	OSMO_PFCP_IEI_ACTIVATION_TIME = 163,
+	OSMO_PFCP_IEI_DEACTIVATION_TIME = 164,
+	OSMO_PFCP_IEI_CREATE_MAR = 165,
+	OSMO_PFCP_IEI_3GPP_ACCESS_FORW_ACTION_INFO = 166,
+	OSMO_PFCP_IEI_NON_3GPP_ACCESS_FORW_ACTION_INFO = 167,
+	OSMO_PFCP_IEI_REMOVE_MAR = 168,
+	OSMO_PFCP_IEI_UPD_MAR = 169,
+	OSMO_PFCP_IEI_MAR_ID = 170,
+	OSMO_PFCP_IEI_STEERING_FUNCTIONALITY = 171,
+	OSMO_PFCP_IEI_STEERING_MODE = 172,
+	OSMO_PFCP_IEI_WEIGHT = 173,
+	OSMO_PFCP_IEI_PRIORITY = 174,
+	OSMO_PFCP_IEI_UPD_3GPP_ACCESS_FORW_ACTION_INFO = 175,
+	OSMO_PFCP_IEI_UPD_NON_3GPP_ACCESS_FORW_ACTION_INFO = 176,
+	OSMO_PFCP_IEI_UE_IP_ADDRESS_POOL_IDENTITY = 177,
+	OSMO_PFCP_IEI_ALTERNATIVE_SMF_IP_ADDRESS = 178,
+	OSMO_PFCP_IEI_PACKET_REPLICATION_AND_DETECTION_CARRY_ON_INFO = 179,
+	OSMO_PFCP_IEI_SMF_SET_ID = 180,
+	OSMO_PFCP_IEI_QUOTA_VALIDITY_TIME = 181,
+	OSMO_PFCP_IEI_NUMBER_OF_REPS = 182,
+	OSMO_PFCP_IEI_PFCP_SESS_RETENTION_INFO_IN_ASSOC_SETUP_REQ = 183,
+	OSMO_PFCP_IEI_PFCPASRSP_FLAGS = 184,
+	OSMO_PFCP_IEI_CP_ENTITY_IP_ADDRESS = 185,
+	OSMO_PFCP_IEI_PFCPSEREQ_FLAGS = 186,
+	OSMO_PFCP_IEI_USER_PLANE_PATH_RECOVERY_REP = 187,
+	OSMO_PFCP_IEI_IP_MULTICAST_ADDR_INFO_IN_SESS_EST_REQ = 188,
+	OSMO_PFCP_IEI_JOIN_IP_MULTICAST_INFO_IE_IN_USAGE_REP = 189,
+	OSMO_PFCP_IEI_LEAVE_IP_MULTICAST_INFO_IE_IN_USAGE_REP = 190,
+	OSMO_PFCP_IEI_IP_MULTICAST_ADDRESS = 191,
+	OSMO_PFCP_IEI_SOURCE_IP_ADDRESS = 192,
+	OSMO_PFCP_IEI_PACKET_RATE_STATUS = 193,
+	OSMO_PFCP_IEI_CREATE_BRIDGE_INFO_FOR_TSC = 194,
+	OSMO_PFCP_IEI_CREATED_BRIDGE_INFO_FOR_TSC = 195,
+	OSMO_PFCP_IEI_DS_TT_PORT_NUMBER = 196,
+	OSMO_PFCP_IEI_NW_TT_PORT_NUMBER = 197,
+	OSMO_PFCP_IEI_TSN_BRIDGE_ID = 198,
+	OSMO_PFCP_IEI_TSC_MGMT_INFO_IE_IN_SESS_MOD_REQ = 199,
+	OSMO_PFCP_IEI_TSC_MGMT_INFO_IE_IN_SESS_MOD_RESP = 200,
+	OSMO_PFCP_IEI_TSC_MGMT_INFO_IE_IN_SESS_REP_REQ = 201,
+	OSMO_PFCP_IEI_PORT_MGMT_INFO_CONTAINER = 202,
+	OSMO_PFCP_IEI_CLOCK_DRIFT_CTRL_INFO = 203,
+	OSMO_PFCP_IEI_REQUESTED_CLOCK_DRIFT_INFO = 204,
+	OSMO_PFCP_IEI_CLOCK_DRIFT_REP = 205,
+	OSMO_PFCP_IEI_TSN_TIME_DOMAIN_NUMBER = 206,
+	OSMO_PFCP_IEI_TIME_OFFSET_THRESH = 207,
+	OSMO_PFCP_IEI_CUMULATIVE_RATERATIO_THRESH = 208,
+	OSMO_PFCP_IEI_TIME_OFFSET_MEAS = 209,
+	OSMO_PFCP_IEI_CUMULATIVE_RATERATIO_MEAS = 210,
+	OSMO_PFCP_IEI_REMOVE_SRR = 211,
+	OSMO_PFCP_IEI_CREATE_SRR = 212,
+	OSMO_PFCP_IEI_UPD_SRR = 213,
+	OSMO_PFCP_IEI_SESS_REP = 214,
+	OSMO_PFCP_IEI_SRR_ID = 215,
+	OSMO_PFCP_IEI_ACCESS_AVAIL_CTRL_INFO = 216,
+	OSMO_PFCP_IEI_REQUESTED_ACCESS_AVAIL_INFO = 217,
+	OSMO_PFCP_IEI_ACCESS_AVAIL_REP = 218,
+	OSMO_PFCP_IEI_ACCESS_AVAIL_INFO = 219,
+	OSMO_PFCP_IEI_PROVIDE_ATSSS_CTRL_INFO = 220,
+	OSMO_PFCP_IEI_ATSSS_CTRL_PARAMS = 221,
+	OSMO_PFCP_IEI_MPTCP_CTRL_INFO = 222,
+	OSMO_PFCP_IEI_ATSSS_LL_CTRL_INFO = 223,
+	OSMO_PFCP_IEI_PMF_CTRL_INFO = 224,
+	OSMO_PFCP_IEI_MPTCP_PARAMS = 225,
+	OSMO_PFCP_IEI_ATSSS_LL_PARAMS = 226,
+	OSMO_PFCP_IEI_PMF_PARAMS = 227,
+	OSMO_PFCP_IEI_MPTCP_ADDRESS_INFO = 228,
+	OSMO_PFCP_IEI_UE_LINK_SPECIFIC_IP_ADDRESS = 229,
+	OSMO_PFCP_IEI_PMF_ADDRESS_INFO = 230,
+	OSMO_PFCP_IEI_ATSSS_LL_INFO = 231,
+	OSMO_PFCP_IEI_DATA_NETWORK_ACCESS_IDENTIFIER = 232,
+	OSMO_PFCP_IEI_UE_IP_ADDRESS_POOL_INFO = 233,
+	OSMO_PFCP_IEI_AVERAGE_PACKET_DELAY = 234,
+	OSMO_PFCP_IEI_MIN_PACKET_DELAY = 235,
+	OSMO_PFCP_IEI_MAX_PACKET_DELAY = 236,
+	OSMO_PFCP_IEI_QOS_REP_TRIGGER = 237,
+	OSMO_PFCP_IEI_GTP_U_PATH_QOS_CTRL_INFO = 238,
+	OSMO_PFCP_IEI_GTP_U_PATH_QOS_REP_NODE_REP_REQ = 239,
+	OSMO_PFCP_IEI_QOS_INFO_IN_GTP_U_PATH_QOS_REP = 240,
+	OSMO_PFCP_IEI_GTP_U_PATH_IFACE_TYPE = 241,
+	OSMO_PFCP_IEI_QOS_MONITORING_PER_QOS_FLOW_CTRL_INFO = 242,
+	OSMO_PFCP_IEI_REQUESTED_QOS_MONITORING = 243,
+	OSMO_PFCP_IEI_REPORTING_FREQUENCY = 244,
+	OSMO_PFCP_IEI_PACKET_DELAY_THRESHOLDS = 245,
+	OSMO_PFCP_IEI_MIN_WAIT_TIME = 246,
+	OSMO_PFCP_IEI_QOS_MONITORING_REP = 247,
+	OSMO_PFCP_IEI_QOS_MONITORING_MEAS = 248,
+	OSMO_PFCP_IEI_MT_EDT_CTRL_INFO = 249,
+	OSMO_PFCP_IEI_DL_DATA_PACKETS_SIZE = 250,
+	OSMO_PFCP_IEI_QER_CTRL_INDICATIONS = 251,
+	OSMO_PFCP_IEI_PACKET_RATE_STATUS_REP = 252,
+	OSMO_PFCP_IEI_NF_INST_ID = 253,
+	OSMO_PFCP_IEI_ETHERNET_CONTEXT_INFO = 254,
+	OSMO_PFCP_IEI_REDUNDANT_TRANSMISSION_PARAMS = 255,
+	OSMO_PFCP_IEI_UPDATED_PDR = 256,
+	OSMO_PFCP_IEI_S_NSSAI = 257,
+	OSMO_PFCP_IEI_IP_VERSION = 258,
+	OSMO_PFCP_IEI_PFCPASREQ_FLAGS = 259,
+	OSMO_PFCP_IEI_DATA_STATUS = 260,
+	OSMO_PFCP_IEI_PROVIDE_RDS_CONF_INFO = 261,
+	OSMO_PFCP_IEI_RDS_CONF_INFO = 262,
+	OSMO_PFCP_IEI_QUERY_PACKET_RATE_STATUS_IE_IN_SESS_MOD_REQ = 263,
+	OSMO_PFCP_IEI_PACKET_RATE_STATUS_REP_IE_IN_SESS_MOD_RESP = 264,
+	OSMO_PFCP_IEI_MPTCP_APPLICABLE_IND = 265,
+	OSMO_PFCP_IEI_BRIDGE_MGMT_INFO_CONTAINER = 266,
+	OSMO_PFCP_IEI_UE_IP_ADDRESS_USAGE_INFO = 267,
+	OSMO_PFCP_IEI_NUMBER_OF_UE_IP_ADDRS = 268,
+	OSMO_PFCP_IEI_VALIDITY_TIMER = 269,
+	OSMO_PFCP_IEI_REDUNDANT_TRANSMISSION_FORW_PARAMS = 270,
+	OSMO_PFCP_IEI_TRANSPORT_DELAY_REPORTING = 271,
+};
+
+/* Section 8.2.1 / Table 8.2.1-1 */
+enum osmo_pfcp_cause {
+	OSMO_PFCP_CAUSE_RESERVED = 0,
+	OSMO_PFCP_CAUSE_REQUEST_ACCEPTED = 1,
+	OSMO_PFCP_CAUSE_MORE_USAGE_REPORT_TO_SEND = 2,
+	OSMO_PFCP_CAUSE_REQUEST_REJECTED = 64,
+	OSMO_PFCP_CAUSE_SESSION_CTX_NOT_FOUND = 65,
+	OSMO_PFCP_CAUSE_MANDATORY_IE_MISSING = 66,
+	OSMO_PFCP_CAUSE_CONDITIONAL_IE_MISSING = 67,
+	OSMO_PFCP_CAUSE_INVALID_LENGTH = 68,
+	OSMO_PFCP_CAUSE_MANDATORY_IE_INCORRECT = 69,
+	OSMO_PFCP_CAUSE_INVALID_FORW_POLICY = 70,
+	OSMO_PFCP_CAUSE_INVALID_F_TEID_ALLOC_OPTION = 71,
+	OSMO_PFCP_CAUSE_NO_ESTABLISHED_PFCP_ASSOC = 72,
+	OSMO_PFCP_CAUSE_RULE_CREATION_MOD_FAILURE = 73,
+	OSMO_PFCP_CAUSE_PFCP_ENTITY_IN_CONGESTION = 74,
+	OSMO_PFCP_CAUSE_NO_RESOURCES_AVAILABLE = 75,
+	OSMO_PFCP_CAUSE_SERVICE_NOT_SUPPORTED = 76,
+	OSMO_PFCP_CAUSE_SYSTEM_FAILURE = 77,
+	OSMO_PFCP_CAUSE_REDIRECTION_REQUESTED = 78,
+	OSMO_PFCP_CAUSE_ALL_DYNAMIC_ADDRESSES_ARE_OCCUPIED = 79,
+};
+
+/* Section 8.2.38 */
+enum osmo_pfcp_node_id_type {
+	OSMO_PFCP_NODE_ID_T_IPV4 = 0,
+	OSMO_PFCP_NODE_ID_T_IPV6 = 1,
+	OSMO_PFCP_NODE_ID_T_FQDN = 2,
+};
+
+enum osmo_pfcp_3gpp_iface_type {
+	OSMO_PFCP_3GPP_IFACE_TYPE_S1_U = 0,
+	OSMO_PFCP_3GPP_IFACE_TYPE_S5_S8_U = 1,
+	OSMO_PFCP_3GPP_IFACE_TYPE_S4_U = 2,
+	OSMO_PFCP_3GPP_IFACE_TYPE_S11_U = 3,
+	OSMO_PFCP_3GPP_IFACE_TYPE_S12_U = 4,
+	OSMO_PFCP_3GPP_IFACE_TYPE_GN_GP_U = 5,
+	OSMO_PFCP_3GPP_IFACE_TYPE_S2A_U = 6,
+	OSMO_PFCP_3GPP_IFACE_TYPE_S2B_U = 7,
+	OSMO_PFCP_3GPP_IFACE_TYPE_ENODEB_GTP_U_INTERFACE_FOR_DL_DATA_FORWARDING = 8,
+	OSMO_PFCP_3GPP_IFACE_TYPE_ENODEB_GTP_U_INTERFACE_FOR_UL_DATA_FORWARDING = 9,
+	OSMO_PFCP_3GPP_IFACE_TYPE_SGW_UPF_GTP_U_INTERFACE_FOR_DL_DATA_FORWARDING = 10,
+	OSMO_PFCP_3GPP_IFACE_TYPE_N3_3GPP_ACCESS = 11,
+	OSMO_PFCP_3GPP_IFACE_TYPE_N3_TRUSTED_NON_3GPP_ACCESS = 12,
+	OSMO_PFCP_3GPP_IFACE_TYPE_N3_UNTRUSTED_NON_3GPP_ACCESS = 13,
+	OSMO_PFCP_3GPP_IFACE_TYPE_N3_FOR_DATA_FORWARDING = 14,
+	OSMO_PFCP_3GPP_IFACE_TYPE_N9 = 15,
+	OSMO_PFCP_3GPP_IFACE_TYPE_SGI = 16,
+	OSMO_PFCP_3GPP_IFACE_TYPE_N6 = 17,
+	OSMO_PFCP_3GPP_IFACE_TYPE_N19 = 18,
+	OSMO_PFCP_3GPP_IFACE_TYPE_S8_U = 19,
+	OSMO_PFCP_3GPP_IFACE_TYPE_GP_U = 20,
+};
+
+enum osmo_pfcp_source_iface {
+	OSMO_PFCP_SOURCE_IFACE_ACCESS = 0,
+	OSMO_PFCP_SOURCE_IFACE_CORE = 1,
+	OSMO_PFCP_SOURCE_IFACE_SGI_LAN_N6_LAN = 2,
+	OSMO_PFCP_SOURCE_IFACE_CP_FUNCTION = 3,
+	OSMO_PFCP_SOURCE_IFACE_5G_VN_INTERNAL = 4,
+};
+
+enum osmo_pfcp_dest_iface {
+	OSMO_PFCP_DEST_IFACE_ACCESS = 0,
+	OSMO_PFCP_DEST_IFACE_CORE = 1,
+	OSMO_PFCP_DEST_IFACE_SGI_LAN_N6_LAN = 2,
+	OSMO_PFCP_DEST_IFACE_CP_FUNCTION = 3,
+	OSMO_PFCP_DEST_IFACE_LI_FUNCTION = 4,
+	OSMO_PFCP_DEST_IFACE_5G_VN_INTERNAL = 5,
+};
+
+/* The enum values correspond to the bit index in the supported features bitmask in the PFCP UP Function Features IE.
+ * 0 means first octet and first bit, "Octet 5 Bit 1" as in spec;
+ * 7 means first octet last bit, "Octet 5 Bit 8";
+ * 8 means second octet first bit, "Octet 6 Bit 1";
+ * and so on.
+ * Intended for use with osmo_pfcp_bits_get(), osmo_pfcp_bits_set(), osmo_pfcp_bits_to_str_c().
+ */
+enum osmo_pfcp_up_feature {
+	OSMO_PFCP_UP_FEAT_BUCP = 0,
+	OSMO_PFCP_UP_FEAT_DDND,
+	OSMO_PFCP_UP_FEAT_DLBD,
+	OSMO_PFCP_UP_FEAT_TRST,
+	OSMO_PFCP_UP_FEAT_FTUP,
+	OSMO_PFCP_UP_FEAT_PFDM,
+	OSMO_PFCP_UP_FEAT_HEEU,
+	OSMO_PFCP_UP_FEAT_TREU,
+	OSMO_PFCP_UP_FEAT_EMPU,
+	OSMO_PFCP_UP_FEAT_PDIU,
+	OSMO_PFCP_UP_FEAT_UDBC,
+	OSMO_PFCP_UP_FEAT_QUOAC,
+	OSMO_PFCP_UP_FEAT_TRACE,
+	OSMO_PFCP_UP_FEAT_FRRT,
+	OSMO_PFCP_UP_FEAT_PFDE,
+	OSMO_PFCP_UP_FEAT_EPFAR,
+	OSMO_PFCP_UP_FEAT_DPDRA,
+	OSMO_PFCP_UP_FEAT_ADPDP,
+	OSMO_PFCP_UP_FEAT_UEIP,
+	OSMO_PFCP_UP_FEAT_SSET,
+	OSMO_PFCP_UP_FEAT_MNOP,
+	OSMO_PFCP_UP_FEAT_MTE,
+	OSMO_PFCP_UP_FEAT_BUNDL,
+	OSMO_PFCP_UP_FEAT_GCOM,
+	OSMO_PFCP_UP_FEAT_MPAS,
+	OSMO_PFCP_UP_FEAT_RTTL,
+	OSMO_PFCP_UP_FEAT_VTIME,
+	OSMO_PFCP_UP_FEAT_NORP,
+	OSMO_PFCP_UP_FEAT_IP6PL,
+	OSMO_PFCP_UP_FEAT_TSCU,
+	OSMO_PFCP_UP_FEAT_MPTCP,
+	OSMO_PFCP_UP_FEAT_ATSSSLL,
+	OSMO_PFCP_UP_FEAT_QFQM,
+	OSMO_PFCP_UP_FEAT_GPQM,
+	OSMO_PFCP_UP_FEAT_MTEDT,
+	OSMO_PFCP_UP_FEAT_CIOT,
+	OSMO_PFCP_UP_FEAT_ETHAR,
+	OSMO_PFCP_UP_FEAT_DDDS,
+	OSMO_PFCP_UP_FEAT_RDS,
+	OSMO_PFCP_UP_FEAT_RTTWP,
+};
+
+/* The enum values correspond to the bit index in the supported features bitmask in the PFCP CP Function Features IE.
+ * 0 means first octet and first bit, "Octet 5 Bit 1" as in spec;
+ * 7 means first octet last bit, "Octet 5 Bit 8";
+ * 8 means second octet first bit, "Octet 6 Bit 1";
+ * and so on.
+ * Intended for use with osmo_pfcp_bits_get(), osmo_pfcp_bits_set(), osmo_pfcp_bits_to_str_c().
+ */
+enum osmo_pfcp_cp_feature {
+	OSMO_PFCP_CP_FEAT_LOAD = 0,
+	OSMO_PFCP_CP_FEAT_OVRL,
+	OSMO_PFCP_CP_FEAT_EPFAR,
+	OSMO_PFCP_CP_FEAT_SSET,
+	OSMO_PFCP_CP_FEAT_BUNDL,
+	OSMO_PFCP_CP_FEAT_MPAS,
+	OSMO_PFCP_CP_FEAT_ARDR,
+	OSMO_PFCP_CP_FEAT_UIAUR,
+};
+
+/* The enum values correspond to the bit index in the PFCP Apply Action IE.
+ * 0 means first octet and first bit, "Octet 5 Bit 1" as in spec;
+ * 7 means first octet last bit, "Octet 5 Bit 8";
+ * 8 means second octet first bit, "Octet 6 Bit 1";
+ * and so on.
+ * Intended for use with osmo_pfcp_bits_get(), osmo_pfcp_bits_set(), osmo_pfcp_bits_to_str_c().
+ */
+enum osmo_pfcp_apply_action {
+	OSMO_PFCP_APPLY_ACTION_DROP = 0,
+	OSMO_PFCP_APPLY_ACTION_FORW,
+	OSMO_PFCP_APPLY_ACTION_BUFF,
+	OSMO_PFCP_APPLY_ACTION_NOCP,
+	OSMO_PFCP_APPLY_ACTION_DUPL,
+	OSMO_PFCP_APPLY_ACTION_IPMA,
+	OSMO_PFCP_APPLY_ACTION_IPMD,
+	OSMO_PFCP_APPLY_ACTION_DFRT,
+	OSMO_PFCP_APPLY_ACTION_EDRT,
+	OSMO_PFCP_APPLY_ACTION_BDPN,
+	OSMO_PFCP_APPLY_ACTION_DDPN,
+};
+
+/* The enum values correspond to the bit index in the description bitmask in the PFCP Outer Header Creation IE.
+ * 0 means first octet and first bit, "Octet 5 Bit 1" as in spec;
+ * 7 means first octet last bit, "Octet 5 Bit 8";
+ * 8 means second octet first bit, "Octet 6 Bit 1";
+ * and so on.
+ * Intended for use with osmo_pfcp_bits_get(), osmo_pfcp_bits_set(), osmo_pfcp_bits_to_str_c().
+ */
+enum osmo_pfcp_outer_header_creation {
+	OSMO_PFCP_OUTER_HEADER_CREATION_GTP_U_UDP_IPV4 = 0,
+	OSMO_PFCP_OUTER_HEADER_CREATION_GTP_U_UDP_IPV6,
+	OSMO_PFCP_OUTER_HEADER_CREATION_UDP_IPV4,
+	OSMO_PFCP_OUTER_HEADER_CREATION_UDP_IPV6,
+	OSMO_PFCP_OUTER_HEADER_CREATION_IPV4,
+	OSMO_PFCP_OUTER_HEADER_CREATION_IPV6,
+	OSMO_PFCP_OUTER_HEADER_CREATION_C_TAG,
+	OSMO_PFCP_OUTER_HEADER_CREATION_S_TAG,
+	OSMO_PFCP_OUTER_HEADER_CREATION_N19_INDICATION,
+	OSMO_PFCP_OUTER_HEADER_CREATION_N6_INDICATION,
+};
+
+/* 3GPP TS 29.244 8.2.64 */
+enum osmo_pfcp_outer_header_removal_desc {
+	OSMO_PFCP_OUTER_HEADER_REMOVAL_GTP_U_UDP_IPV4 = 0,
+	OSMO_PFCP_OUTER_HEADER_REMOVAL_GTP_U_UDP_IPV6 = 1,
+	OSMO_PFCP_OUTER_HEADER_REMOVAL_UDP_IPV4 = 2,
+	OSMO_PFCP_OUTER_HEADER_REMOVAL_UDP_IPV6 = 3,
+	OSMO_PFCP_OUTER_HEADER_REMOVAL_IPV4 = 4,
+	OSMO_PFCP_OUTER_HEADER_REMOVAL_IPV6 = 5,
+	OSMO_PFCP_OUTER_HEADER_REMOVAL_GTP_U_UDP_IP = 6,
+	OSMO_PFCP_OUTER_HEADER_REMOVAL_VLAN_S_TAG = 7,
+	OSMO_PFCP_OUTER_HEADER_REMOVAL_S_TAG_AND_C_TAG = 8,
+};

include/osmocom/pfcp/pfcp_strs.h

@@ -0,0 +1,94 @@
+/*
+ * (C) 2021-2022 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 <osmocom/core/utils.h>
+
+#include <osmocom/pfcp/pfcp_proto.h>
+
+extern const struct value_string osmo_pfcp_message_type_strs[];
+static inline const char *osmo_pfcp_message_type_str(enum osmo_pfcp_message_type val)
+{
+	return get_value_string(osmo_pfcp_message_type_strs, val);
+}
+
+extern const struct value_string osmo_pfcp_iei_strs[];
+static inline const char *osmo_pfcp_iei_str(enum osmo_pfcp_iei val)
+{
+	return get_value_string(osmo_pfcp_iei_strs, val);
+}
+
+extern const struct value_string osmo_pfcp_cause_strs[];
+static inline const char *osmo_pfcp_cause_str(enum osmo_pfcp_cause val)
+{
+	return get_value_string(osmo_pfcp_cause_strs, val);
+}
+
+extern const struct value_string osmo_pfcp_up_feature_strs[];
+static inline const char *osmo_pfcp_up_feature_str(enum osmo_pfcp_up_feature val)
+{
+	return get_value_string(osmo_pfcp_up_feature_strs, val);
+}
+
+extern const struct value_string osmo_pfcp_cp_feature_strs[];
+static inline const char *osmo_pfcp_cp_feature_str(enum osmo_pfcp_cp_feature val)
+{
+	return get_value_string(osmo_pfcp_cp_feature_strs, val);
+}
+
+extern const struct value_string osmo_pfcp_apply_action_strs[];
+static inline const char *osmo_pfcp_apply_action_str(enum osmo_pfcp_apply_action val)
+{
+	return get_value_string(osmo_pfcp_apply_action_strs, val);
+}
+
+extern const struct value_string osmo_pfcp_outer_header_creation_strs[];
+static inline const char *osmo_pfcp_outer_header_creation_str(enum osmo_pfcp_outer_header_creation val)
+{
+	return get_value_string(osmo_pfcp_outer_header_creation_strs, val);
+}
+
+extern const struct value_string osmo_pfcp_outer_header_removal_desc_strs[];
+static inline const char *osmo_pfcp_outer_header_removal_desc_str(enum osmo_pfcp_outer_header_removal_desc val)
+{
+	return get_value_string(osmo_pfcp_outer_header_removal_desc_strs, val);
+}
+
+extern const struct value_string osmo_pfcp_source_iface_strs[];
+static inline const char *osmo_pfcp_source_iface_str(enum osmo_pfcp_source_iface val)
+{
+	return get_value_string(osmo_pfcp_source_iface_strs, val);
+}
+
+extern const struct value_string osmo_pfcp_dest_iface_strs[];
+static inline const char *osmo_pfcp_dest_iface_str(enum osmo_pfcp_dest_iface val)
+{
+	return get_value_string(osmo_pfcp_dest_iface_strs, val);
+}
+
+extern const struct value_string osmo_pfcp_3gpp_iface_type_strs[];
+static inline const char *osmo_pfcp_3gpp_iface_type_str(enum osmo_pfcp_3gpp_iface_type val)
+{
+	return get_value_string(osmo_pfcp_3gpp_iface_type_strs, val);
+}

include/osmocom/upf/upf.h

@@ -76,9 +76,6 @@ struct g_upf {
 
 	/* Tunnel encaps decaps via GTP kernel module */
 	struct {
-		/* if true, don't actually send commands to the GTP kernel module, just return success. */
-		bool mockup;
-
 		/* GTP devices as in osmo-upf.cfg */
 		struct gtp_vty_cfg vty_cfg;
 
@@ -93,9 +90,6 @@ struct g_upf {
 
 	/* Tunnel forwarding via linux netfilter */
 	struct {
-		/* if true, don't actually send commands to nftables, just return success. */
-		bool mockup;
-
 		struct nft_ctx *nft_ctx;
 		char *table_name;
 		int priority;

osmoappdesc.py

@@ -15,13 +15,13 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>
 
 app_configs = {
-    "osmo-upf": ["doc/examples/osmo-upf/osmo-upf-mockup.cfg"]
+    "osmo-upf": ["doc/examples/osmo-upf/osmo-upf.cfg"]
 }
 
 apps = [(4275, "src/osmo-upf/osmo-upf", "OsmoUPF", "osmo-upf")
         ]
 
 vty_command = ["./src/osmo-upf/osmo-upf", "-c",
-               "doc/examples/osmo-upf/osmo-upf-mockup.cfg"]
+               "doc/examples/osmo-upf/osmo-upf.cfg"]
 
 vty_app = apps[0]

src/Makefile.am

@@ -1,4 +1,6 @@
 SUBDIRS = \
+	libosmo-gtlv \
+	libosmo-pfcp \
 	osmo-upf \
 	osmo-pfcp-tool \
 	$(NULL)

src/libosmo-gtlv/Makefile.am

@@ -0,0 +1,27 @@
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	-I$(builddir) \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
+
+AM_LDFLAGS = \
+	$(LIBOSMOCORE_LIBS) \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
+
+noinst_LIBRARIES = \
+	libosmo-gtlv.a \
+	$(NULL)
+
+libosmo_gtlv_a_SOURCES = \
+	gtlv.c \
+	gtlv_dec_enc.c \
+	gtlv_gen.c \
+	$(NULL)

src/libosmo-gtlv/gtlv.c

@@ -0,0 +1,342 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <errno.h>
+
+#include <osmocom/core/bits.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/gtlv/gtlv.h>
+
+int osmo_gtlv_tag_inst_cmp(const struct osmo_gtlv_tag_inst *a, const struct osmo_gtlv_tag_inst *b)
+{
+	int cmp;
+	if (a == b)
+		return 0;
+	if (!a)
+		return -1;
+	if (!b)
+		return 1;
+	cmp = OSMO_CMP(a->tag, b->tag);
+	if (cmp)
+		return cmp;
+	cmp = OSMO_CMP(a->instance_present ? 1 : 0, b->instance_present ? 1 : 0);
+	if (cmp)
+		return cmp;
+	if (a->instance_present)
+		return OSMO_CMP(a->instance, b->instance);
+	return 0;
+}
+
+int osmo_gtlv_tag_inst_to_str_buf(char *buf, size_t buflen, const struct osmo_gtlv_tag_inst *ti,
+				 const struct value_string *tag_names)
+{
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+	if (!tag_names)
+		OSMO_STRBUF_PRINTF(sb, "%u", ti->tag);
+	else
+		OSMO_STRBUF_PRINTF(sb, "%s", get_value_string(tag_names, ti->tag));
+	if (ti->instance_present)
+		OSMO_STRBUF_PRINTF(sb, "[%u]", ti->instance);
+	return sb.chars_needed;
+}
+
+char *osmo_gtlv_tag_inst_to_str_c(void *ctx, const struct osmo_gtlv_tag_inst *ti,
+				 const struct value_string *tag_names)
+{
+	OSMO_NAME_C_IMPL(ctx, 64, "ERROR", osmo_gtlv_tag_inst_to_str_buf, ti, tag_names)
+}
+
+static int next_tl_valid(const struct osmo_gtlv_load *gtlv, const uint8_t **ie_start_p, size_t *buflen_left_p)
+{
+	const uint8_t *ie_start;
+	size_t buflen_left;
+
+	/* Start of next IE, or first IE for first invocation. */
+	if (!gtlv->val)
+		ie_start = gtlv->src.data;
+	else
+		ie_start = gtlv->val + gtlv->len;
+
+	/* Sanity */
+	if (ie_start < gtlv->src.data || ie_start > gtlv->src.data + gtlv->src.len)
+		return -ENOSPC;
+
+	buflen_left = gtlv->src.len - (ie_start - gtlv->src.data);
+
+	/* Too short for parsing an IE? Check also against integer overflow. */
+	if (buflen_left && ((buflen_left < gtlv->cfg->tl_min_size) || (buflen_left > gtlv->src.len)))
+		return -EBADMSG;
+
+	*ie_start_p = ie_start;
+	*buflen_left_p = buflen_left;
+	return 0;
+}
+
+/* Return a TLV IE from a message buffer.
+ *
+ * Return the first or next TLV data found in the data buffer, based on the state of the gtlv parameter.
+ * When gtlv->val is NULL, return the first IE in the data buffer.
+ * Otherwise assume that gtlv points at a valid IE in the data structure, and return the subsequent IE.
+ *
+ * Usage example:
+ *
+ *   struct osmo_gtlv gtlv = {
+ *           .cfg = osmo_t16l16v_cfg,
+ *           .src = { .data = msgb_l3(msg), .len = msgb_l3len(msg) },
+ *   };
+ *   for (;;) {
+ *           if (osmo_gtlv_next(&gtlv)) {
+ *                   printf("Error\n");
+ *                   break;
+ *           }
+ *           if (!gtlv.val) {
+ *                   printf("End\n");
+ *                   break;
+ *           }
+ *           printf("Tag %u: %zu octets: %s\n", gtlv.tag, gtlv.len, osmo_hexdump(gtlv.val, gtlv.len));
+ *   }
+ *
+ * \param[inout] gtlv  Buffer to return the IE data, and state for TLV parsing position. gtlv->msg should indicate the
+ *                   overall message buffer. The other gtlv members should be zero initialized before the first call, and
+ *                   remain unchanged between invocations of this function.
+ * \returns 0 on success, negative on TLV parsing error. The IE data is returned in gtlv->tag, gtlv->len and gtlv->val;
+ *          gtlv->val == NULL if no more IEs remain in the buffer.
+ */
+int osmo_gtlv_load_next(struct osmo_gtlv_load *gtlv)
+{
+	const uint8_t *ie_start;
+	const uint8_t *ie_end;
+	size_t buflen_left;
+	int rc;
+
+	rc = next_tl_valid(gtlv, &ie_start, &buflen_left);
+	if (rc)
+		return rc;
+
+	/* No more IEs? */
+	if (!buflen_left) {
+		gtlv->val = NULL;
+		return 0;
+	}
+
+	/* Locate next IE */
+	OSMO_ASSERT(gtlv->cfg->load_tl);
+	gtlv->ti = (struct osmo_gtlv_tag_inst){};
+	rc = gtlv->cfg->load_tl(gtlv, ie_start, buflen_left);
+	if (rc)
+		return rc;
+
+	/* Sanity */
+	ie_end = gtlv->val + gtlv->len;
+	if (ie_end < gtlv->src.data || ie_end > gtlv->src.data + gtlv->src.len)
+		return -EBADMSG;
+
+	return 0;
+}
+
+/* Return the tag of the IE that osmo_gtlv_next() would yield, do not change the gtlv state.
+ *
+ * \param[in] gtlv  state for TLV parsing position; is not modified.
+ * \param[out] tag  the tag number on success, if NULL don't return the tag.
+ * \param[out] instance  the instance number or OSMO_GTLV_NO_INSTANCE if there is no instance value,
+ *                       if NULL don't return the instance value.
+ * \returns 0 on success, negative on TLV parsing error, -ENOENT when no more tags follow.
+ */
+int osmo_gtlv_load_peek_tag(const struct osmo_gtlv_load *gtlv, struct osmo_gtlv_tag_inst *ti)
+{
+	const uint8_t *ie_start;
+	size_t buflen_left;
+	int rc;
+	/* Guard against modification by load_tl(). */
+	struct osmo_gtlv_load mtlv = *gtlv;
+	mtlv.ti = (struct osmo_gtlv_tag_inst){};
+
+	rc = next_tl_valid(&mtlv, &ie_start, &buflen_left);
+	if (rc)
+		return rc;
+
+	if (!buflen_left)
+		return -ENOENT;
+
+	/* Return next IE tag*/
+	OSMO_ASSERT(mtlv.cfg->load_tl);
+	rc = gtlv->cfg->load_tl(&mtlv, ie_start, buflen_left);
+	if (rc)
+		return -EBADMSG;
+	if (ti)
+		*ti = mtlv.ti;
+	return 0;
+}
+
+/* Same as osmo_gtlv_load_next(), but skip any IEs until the given tag is reached. Change the gtlv state only when success
+ * is returned.
+ * \param[out] gtlv  Return the next IE's TLV info.
+ * \param[in] tag  Tag value to match.
+ * \param[in] instance  Instance value to match; For IEs that have no instance value (no TLIV), pass
+ *                      OSMO_GTLV_NO_INSTANCE.
+ * \return 0 when the tag is found. Return -ENOENT when no such tag follows and keep the gtlv unchanged. */
+int osmo_gtlv_load_next_by_tag(struct osmo_gtlv_load *gtlv, unsigned int tag)
+{
+	struct osmo_gtlv_tag_inst ti = { .tag = tag };
+	return osmo_gtlv_load_next_by_tag_inst(gtlv, &ti);
+}
+
+int osmo_gtlv_load_next_by_tag_inst(struct osmo_gtlv_load *gtlv, const struct osmo_gtlv_tag_inst *ti)
+{
+	struct osmo_gtlv_load work = *gtlv;
+	for (;;) {
+		int rc = osmo_gtlv_load_next(&work);
+		if (rc)
+			return rc;
+		if (!work.val)
+			return -ENOENT;
+		if (!osmo_gtlv_tag_inst_cmp(&work.ti, ti)) {
+			*gtlv = work;
+			return 0;
+		}
+	}
+}
+
+/* Put tag header and length at the end of the msgb, according to gtlv->cfg->store_tl().
+ * If the length is not known yet, it can be passed as 0 at first, and osmo_gtlv_put_update_tl() can determine the
+ * resulting length after the value part was put into the msgb.
+ *
+ * Usage example:
+ *
+ *     struct msgb *msg = msgb_alloc(1024, "foo"),
+ *     struct osmo_gtlv_put gtlv = {
+ *             .cfg = osmo_t16l16v_cfg,
+ *             .dst = msg,
+ *     }
+ *
+ *     osmo_gtlv_put_tl(gtlv, 23, 0); // tag 23, length 0 = not known yet
+ *
+ *     msgb_put(msg, 42);
+ *     ...
+ *     msgb_put(msg, 42);
+ *     ...
+ *     msgb_put(msg, 42);
+ *
+ *     osmo_gtlv_put_update_tl(gtlv);
+ *
+ * Return 0 on success, -EINVAL if the tag value is invalid, -EMSGSIZE if len is too large.
+ */
+int osmo_gtlv_put_tl(struct osmo_gtlv_put *gtlv, unsigned int tag, size_t len)
+{
+	struct osmo_gtlv_tag_inst ti = { .tag = tag };
+	return osmo_gtlv_put_tli(gtlv, &ti, len);
+}
+
+/* Put tag header, instance value and length at the end of the msgb, according to gtlv->cfg->store_tl().
+ * This is the same as osmo_gtlv_put_tl(), only osmo_gtlv_put_tl() passes instance = 0.
+ */
+int osmo_gtlv_put_tli(struct osmo_gtlv_put *gtlv, const struct osmo_gtlv_tag_inst *ti, size_t len)
+{
+	int rc;
+	uint8_t *last_tl;
+	OSMO_ASSERT(gtlv->cfg->store_tl);
+	last_tl = gtlv->dst->tail;
+	rc = gtlv->cfg->store_tl(gtlv->dst->tail, msgb_tailroom(gtlv->dst), ti, len, gtlv);
+	if (rc < 0)
+		return rc;
+	if (rc > 0)
+		msgb_put(gtlv->dst, rc);
+	gtlv->last_ti = *ti;
+	gtlv->last_tl = last_tl;
+	gtlv->last_val = gtlv->dst->tail;
+	return 0;
+}
+
+/* Update the length of the last put IE header (last call to osmo_gtlv_put_tl()) to match with the current
+ * gtlv->dst->tail.
+ * Return 0 on success, -EMSGSIZE if the amount of data written since osmo_gtlv_put_tl() is too large.
+ */
+int osmo_gtlv_put_update_tl(struct osmo_gtlv_put *gtlv)
+{
+	size_t len = gtlv->dst->tail - gtlv->last_val;
+	int rc = gtlv->cfg->store_tl(gtlv->last_tl, gtlv->last_val - gtlv->last_tl, &gtlv->last_ti, len, gtlv);
+	if (rc < 0)
+		return rc;
+	/* In case the TL has changed in size, hopefully the implementation has moved the msgb data. Make sure last_val
+	 * points at the right place now. */
+	gtlv->last_val = gtlv->last_tl + rc;
+	return 0;
+}
+
+static int t8l8v_load_tl(struct osmo_gtlv_load *gtlv, const uint8_t *src_data, size_t src_data_len)
+{
+	/* already validated in next_tl_valid(): src_data_len >= cfg->tl_min_size == 2. */
+	gtlv->ti.tag = src_data[0];
+	gtlv->len = src_data[1];
+	gtlv->val = src_data + 2;
+	return 0;
+}
+
+static int t8l8v_store_tl(uint8_t *dst_data, size_t dst_data_avail, const struct osmo_gtlv_tag_inst *ti, size_t len,
+			  struct osmo_gtlv_put *gtlv)
+{
+	if (ti->tag > UINT8_MAX)
+		return -EINVAL;
+	if (len > UINT8_MAX)
+		return -EMSGSIZE;
+	if (dst_data_avail < 2)
+		return -ENOSPC;
+	dst_data[0] = ti->tag;
+	dst_data[1] = len;
+	return 2;
+}
+
+const struct osmo_gtlv_cfg osmo_t8l8v_cfg = {
+	.tl_min_size = 2,
+	.load_tl = t8l8v_load_tl,
+	.store_tl = t8l8v_store_tl,
+};
+
+static int t16l16v_load_tl(struct osmo_gtlv_load *gtlv, const uint8_t *src_data, size_t src_data_len)
+{
+	/* already validated in next_tl_valid(): src_data_len >= cfg->tl_min_size == 4. */
+	gtlv->ti.tag = osmo_load16be(src_data);
+	gtlv->len = osmo_load16be(src_data + 2);
+	gtlv->val = src_data + 4;
+	return 0;
+}
+
+static int t16l16v_store_tl(uint8_t *dst_data, size_t dst_data_avail, const struct osmo_gtlv_tag_inst *ti, size_t len,
+			    struct osmo_gtlv_put *gtlv)
+{
+	if (ti->tag > UINT16_MAX)
+		return -EINVAL;
+	if (len > UINT16_MAX)
+		return -EMSGSIZE;
+	if (dst_data_avail < 4)
+		return -ENOSPC;
+	osmo_store16be(ti->tag, dst_data);
+	osmo_store16be(len, dst_data + 2);
+	return 4;
+}
+
+const struct osmo_gtlv_cfg osmo_t16l16v_cfg = {
+	.tl_min_size = 4,
+	.load_tl = t16l16v_load_tl,
+	.store_tl = t16l16v_store_tl,
+};

src/libosmo-gtlv/gtlv_dec_enc.c

@@ -0,0 +1,530 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <errno.h>
+#include <string.h>
+
+#include <osmocom/core/utils.h>
+
+#include <osmocom/gtlv/gtlv_dec_enc.h>
+
+/* Reverse offsetof(): return the address of the struct member for a given osmo_gtlv_msg and member ofs_foo value. */
+#define MEMB(M, MEMB_OFS) ((void *)((char *)(M) + (MEMB_OFS)))
+
+#define RETURN_ERROR(RC, TAG_INST, FMT, ARGS...) \
+	do {\
+		if (err_cb) { \
+			if ((TAG_INST).instance_present) \
+				err_cb(err_cb_data, (void *)decoded_struct, __FILE__, __LINE__, \
+				       "tag 0x%x = %s instance %u: " FMT " (%d: %s)\n", \
+				       (TAG_INST).tag, get_value_string(iei_strs, (TAG_INST).tag), \
+				       (TAG_INST).instance, ##ARGS, \
+				       RC, strerror((RC) > 0 ? (RC) : -(RC))); \
+			else \
+				err_cb(err_cb_data, (void *)decoded_struct, __FILE__, __LINE__, \
+				       "tag 0x%x = %s: " FMT " (%d: %s)\n", \
+				       (TAG_INST).tag, get_value_string(iei_strs, (TAG_INST).tag), ##ARGS, \
+				       RC, strerror((RC) > 0 ? (RC) : -(RC))); \
+		} \
+		return RC; \
+	} while (0)
+
+
+/*! Decode a TLV structure from raw data to a decoded struct, for unordered TLV IEs.
+ * How to decode IE values and where to place them in the decoded struct, is defined by ie_coding, an array terminated
+ * by a '{}' entry.
+ * The IEs may appear in any ordering in the TLV data.
+ * For unordered decoding, only IEs with has_presence_flag == true or has_count == true may repeat. Other IE definitions
+ * cause the last read TLV to overwrite all previous decodings, all into the first occurrence in ie_coding.
+ * \param[out] decoded_struct  Pointer to the struct to write parsed IE data to.
+ * \param[in] obj_ofs  Pass as zero. Used for nested IEs: offset added to decoded_struct to get to a sub-struct.
+ * \param[in] gtlv  TLV data to parse, as given in gtlv->msg.*. Must be ready for osmo_gtlv_load_start().
+ * \param[in] ie_coding  A list of permitted/expected IEI tags and instructions for decoding.
+ * \param[in] err_cb  Function to call to report an error message, or NULL.
+ * \param[in] err_cb_data  Caller supplied context to pass to the err_cb as 'data' argument.
+ * \param[in] iei_strs  value_string array to give IEI names in error messages passed to err_cb(), or NULL.
+ * \return 0 on success, negative on error.
+ */
+static int osmo_gtlvs_decode_unordered(void *decoded_struct, unsigned int obj_ofs, struct osmo_gtlv_load *gtlv,
+				      const struct osmo_gtlv_coding *ie_coding,
+				      osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs)
+{
+	void *obj = MEMB(decoded_struct, obj_ofs);
+	const struct osmo_gtlv_coding *iec;
+	unsigned int *multi_count_p;
+
+	/* To check for presence of mandatory IEs, need to keep a flag stack of seen ie_coding entries. This array has
+	 * to have at least the nr of entries that the ie_coding array has. Let's allow up to this many ie_coding
+	 * entries to avoid dynamic allocation. Seems like enough. */
+	bool seen_ie_coding_entries[4096] = {};
+	bool *seen_p;
+#define CHECK_SEEN(IEC) do { \
+			unsigned int ie_coding_idx = (IEC) - ie_coding; \
+			if (ie_coding_idx >= ARRAY_SIZE(seen_ie_coding_entries)) \
+				RETURN_ERROR(-ENOTSUP, gtlv->ti, \
+					     "Too many IE definitions for decoding an unordered TLV structure"); \
+			seen_p = &seen_ie_coding_entries[ie_coding_idx]; \
+		} while (0)
+
+
+	osmo_gtlv_load_start(gtlv);
+
+	/* IEs are allowed to come in any order.  So traverse the TLV structure once, and find an IE parser for each (if
+	 * any). */
+	for (;;) {
+		int rc;
+		bool *presence_flag_p;
+		unsigned int memb_next_array_idx;
+		unsigned int memb_ofs;
+		unsigned int ie_max_allowed_count;
+
+		rc = osmo_gtlv_load_next(gtlv);
+		if (rc)
+			RETURN_ERROR(rc, gtlv->ti, "Decoding IEs failed on or after this tag");
+		if (!gtlv->val) {
+			/* End of the TLV structure */
+			break;
+		}
+
+		/* ie_max_allowed_count counts how often the same IEI may appear in a message until all struct members
+		 * that can store them are filled up. */
+		ie_max_allowed_count = 0;
+
+		do {
+			/* Find the IE coding for this tag */
+			for (iec = ie_coding;
+			     !osmo_gtlv_coding_end(iec) && osmo_gtlv_tag_inst_cmp(&iec->ti, &gtlv->ti);
+			     iec++);
+			/* No such IE coding found. */
+			if (osmo_gtlv_coding_end(iec))
+				break;
+
+			/* Keep track how often this tag can occur */
+			ie_max_allowed_count += iec->has_count ? iec->count_max : 1;
+
+			/* Was this iec instance already decoded? Then skip to the next one, if any. */
+			presence_flag_p = iec->has_presence_flag ? MEMB(obj, iec->presence_flag_ofs) : NULL;
+			multi_count_p = iec->has_count ? MEMB(obj, iec->count_ofs) : NULL;
+			if ((presence_flag_p && *presence_flag_p)
+			    || (multi_count_p && *multi_count_p >= iec->count_max))
+				continue;
+			/* For IEs with a presence flag or a multi count, the decoded struct provides the information
+			 * whether the IE has already been decoded. Do the same for mandatory IEs, using local state in
+			 * seen_ie_coding_entries[]. */
+			CHECK_SEEN(iec);
+			if (*seen_p)
+				continue;
+		} while (0);
+		if (osmo_gtlv_coding_end(iec)) {
+			if (ie_max_allowed_count) {
+				/* There have been IE definitions for this IEI, but all slots to decode it are already
+				 * filled. */
+				RETURN_ERROR(-ENOTSUP, gtlv->ti, "Only %u instances of this IE are supported per message",
+					     ie_max_allowed_count);
+			}
+			/* No such IE defined in ie_coding, just skip the TLV. */
+			continue;
+		}
+
+		/* If this is a repeated IE, decode into the correct array index memb[idx],
+		 * next idx == (*multi_count_p). We've already guaranteed above that *multi_count_p < count_max. */
+		memb_next_array_idx = multi_count_p ? *multi_count_p : 0;
+		memb_ofs = iec->memb_ofs + memb_next_array_idx * iec->memb_array_pitch;
+
+		/* Decode IE value part */
+		if (iec->nested_ies) {
+			/* A nested IE: the value part of this TLV is in turn a TLV structure. Decode the inner
+			 * IEs. */
+			struct osmo_gtlv_load inner_tlv = {
+				.cfg = iec->nested_ies_cfg ? : gtlv->cfg,
+				.src = {
+					.data = gtlv->val,
+					.len = gtlv->len,
+				}
+			};
+			bool ordered;
+			switch (iec->nested_ies_ordered) {
+			case OSMO_GTLV_NESTED_IES_ORDERED:
+				ordered = true;
+				break;
+			case OSMO_GTLV_NESTED_IES_ORDERING_SAME:
+			case OSMO_GTLV_NESTED_IES_UNORDERED:
+				ordered = false;
+				break;
+			default:
+				OSMO_ASSERT(0);
+			}
+			rc = osmo_gtlvs_decode(decoded_struct, obj_ofs + memb_ofs, &inner_tlv, ordered, iec->nested_ies,
+					      err_cb, err_cb_data, iei_strs);
+			if (rc)
+				RETURN_ERROR(rc, gtlv->ti, "Error while decoding TLV structure nested inside this IE");
+		} else {
+			/* Normal IE, decode the specific IE data. */
+			if (!iec->dec_func)
+				RETURN_ERROR(-EIO, gtlv->ti, "IE definition lacks a dec_func()");
+			rc = iec->dec_func(decoded_struct, MEMB(obj, memb_ofs), gtlv);
+			if (rc)
+				RETURN_ERROR(rc, gtlv->ti, "Error while decoding this IE");
+		}
+
+		if (multi_count_p) {
+			/* A repeated IE, record that we've added one entry. This increments the foo_count value in the
+			 * decoded osmo_gtlv_msg.ies.*.
+			 * For example, multi_count_p points at osmo_gtlv_msg_session_est_req.create_pdr_count,
+			 * and memb_ofs points at osmo_gtlv_msg_session_est_req.create_pdr. */
+			(*multi_count_p)++;
+		}
+		if (presence_flag_p) {
+			*presence_flag_p = true;
+		}
+		CHECK_SEEN(iec);
+		*seen_p = true;
+	}
+
+	/* Check presence of mandatory IEs */
+	for (iec = ie_coding; !osmo_gtlv_coding_end(iec); iec++) {
+		if (iec->has_presence_flag)
+			continue;
+		multi_count_p = iec->has_count ? MEMB(obj, iec->count_ofs) : NULL;
+		if (multi_count_p) {
+			if (*multi_count_p < iec->count_mandatory)
+				RETURN_ERROR(-EINVAL, iec->ti, "%u instances of this IE are mandatory, got %u",
+					     iec->count_mandatory, *multi_count_p);
+			continue;
+		}
+		/* Neither an optional nor a multi member, hence it must be mandatory. */
+		CHECK_SEEN(iec);
+		if (!*seen_p)
+			RETURN_ERROR(-EINVAL, iec->ti, "Missing mandatory IE");
+	}
+	return 0;
+}
+
+/*! Decode a TLV structure from raw data to a decoded struct, for ordered TLV IEs.
+ * How to decode IE values and where to place them in the decoded struct, is defined by ie_coding, an array terminated
+ * by a '{}' entry.
+ * The IEs in the TLV structure must appear in the same order as they are defined in ie_coding.
+ * cause the last read TLV to overwrite all previous decodings, all into the first occurrence in ie_coding.
+ * \param[out] decoded_struct  Pointer to the struct to write parsed IE data to.
+ * \param[in] obj_ofs  Pass as zero. Used for nested IEs: offset added to decoded_struct to get to a sub-struct.
+ * \param[in] gtlv  TLV data to parse, as given in gtlv->msg.*. Must be ready for osmo_gtlv_load_start().
+ * \param[in] ie_coding  A list of permitted/expected IEI tags and instructions for decoding.
+ * \param[in] err_cb  Function to call to report an error message, or NULL.
+ * \param[in] err_cb_data  Caller supplied context to pass to the err_cb as 'data' argument.
+ * \param[in] iei_strs  value_string array to give IEI names in error messages passed to err_cb(), or NULL.
+ * \return 0 on success, negative on error.
+ */
+static int osmo_gtlvs_decode_ordered(void *decoded_struct, unsigned int obj_ofs, struct osmo_gtlv_load *gtlv,
+				    const struct osmo_gtlv_coding *ie_coding,
+				    osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs)
+{
+	void *obj = MEMB(decoded_struct, obj_ofs);
+
+	osmo_gtlv_load_start(gtlv);
+
+	for (; !osmo_gtlv_coding_end(ie_coding); ie_coding++) {
+		int rc;
+		bool *presence_flag = ie_coding->has_presence_flag ? MEMB(obj, ie_coding->presence_flag_ofs) : NULL;
+		unsigned int *multi_count = ie_coding->has_count ? MEMB(obj, ie_coding->count_ofs) : NULL;
+		struct osmo_gtlv_tag_inst peek_ti;
+
+		rc = osmo_gtlv_load_next_by_tag_inst(gtlv, &ie_coding->ti);
+		switch (rc) {
+		case 0:
+			break;
+		case -ENOENT:
+			if (!presence_flag && (!multi_count || *multi_count < ie_coding->count_mandatory))
+				RETURN_ERROR(rc, ie_coding->ti, "Missing mandatory IE");
+			if (presence_flag)
+				*presence_flag = false;
+			continue;
+		default:
+			RETURN_ERROR(rc, ie_coding->ti, "Error in TLV structure");
+		}
+
+		for (;;) {
+			/* If this is a repeated IE, decode into the correct array index memb[idx],
+			 * next idx == (*multi_count) */
+			unsigned int memb_next_array_idx = multi_count ? *multi_count : 0;
+			unsigned int memb_ofs = ie_coding->memb_ofs + memb_next_array_idx * ie_coding->memb_array_pitch;
+
+			if (multi_count && memb_next_array_idx >= ie_coding->count_max)
+				RETURN_ERROR(-ENOTSUP, ie_coding->ti, "Only %u instances of this IE are supported per message",
+					     ie_coding->count_max);
+
+			/* Decode IE value part */
+			if (ie_coding->nested_ies) {
+				/* A nested IE: the value part of this TLV is in turn a TLV structure. Decode the inner
+				 * IEs. */
+				struct osmo_gtlv_load inner_tlv = {
+					.cfg = ie_coding->nested_ies_cfg ? : gtlv->cfg,
+					.src = {
+						.data = gtlv->val,
+						.len = gtlv->len,
+					}
+				};
+				bool ordered;
+				switch (ie_coding->nested_ies_ordered) {
+				case OSMO_GTLV_NESTED_IES_ORDERING_SAME:
+				case OSMO_GTLV_NESTED_IES_ORDERED:
+					ordered = true;
+					break;
+				case OSMO_GTLV_NESTED_IES_UNORDERED:
+					ordered = false;
+					break;
+				default:
+					OSMO_ASSERT(0);
+				}
+				rc = osmo_gtlvs_decode(decoded_struct, obj_ofs + memb_ofs, &inner_tlv, ordered,
+						      ie_coding->nested_ies, err_cb, err_cb_data, iei_strs);
+				if (rc)
+					RETURN_ERROR(rc, ie_coding->ti,
+						     "Error while decoding TLV structure nested inside this IE");
+			} else {
+				/* Normal IE, decode the specific IE data. */
+				if (!ie_coding->dec_func)
+					RETURN_ERROR(-EIO, ie_coding->ti, "IE definition lacks a dec_func()");
+				rc = ie_coding->dec_func(decoded_struct, MEMB(obj, memb_ofs), gtlv);
+				if (rc)
+					RETURN_ERROR(rc, ie_coding->ti, "Error while decoding this IE");
+			}
+
+			if (presence_flag)
+				*presence_flag = true;
+
+			if (!multi_count) {
+				/* Not a repeated IE. */
+				break;
+			}
+
+			/* A repeated IE, record that we've added one entry. This increments the foo_count value in the
+			 * decoded osmo_pfcp_msg.ies.*.
+			 * For example, multi_count points at osmo_pfcp_msg_session_est_req.create_pdr_count,
+			 * and memb_ofs points at osmo_pfcp_msg_session_est_req.create_pdr. */
+			(*multi_count)++;
+
+			/* Does another one of these IEs follow? */
+			if (osmo_gtlv_load_peek_tag(gtlv, &peek_ti)
+			    || osmo_gtlv_tag_inst_cmp(&peek_ti, &gtlv->ti)) {
+				/* Next tag is a different IE, end the repetition. */
+				break;
+			}
+
+			/* continue, parsing the next repetition of this tag. */
+			rc = osmo_gtlv_load_next(gtlv);
+			if (rc)
+				return rc;
+		}
+		/* continue parsing the next tag. */
+	}
+	return 0;
+}
+
+/*! Decode an entire TLV message from raw data to decoded struct.
+ * How to decode IE values and where to put them in the decoded struct is defined by ie_coding, an array terminated by
+ * a '{}' entry.
+ * \param[out] decoded_struct  Pointer to the struct to write parsed IE data to.
+ * \param[in] obj_ofs  Pass as zero. Used for nested IEs: offset added to decoded_struct to get to a sub-struct.
+ * \param[in] gtlv  TLV data to parse, as given in gtlv->msg.*. Must be ready for osmo_gtlv_load_start().
+ * \param[in] ie_coding  A list of permitted/expected IEI tags and instructions for decoding.
+ * \param[in] err_cb  Function to call to report an error message, or NULL.
+ * \param[in] err_cb_data  Caller supplied context to pass to the err_cb as 'data' argument.
+ * \param[in] iei_strs  value_string array to give IEI names in error messages passed to err_cb(), or NULL.
+ * \return 0 on success, negative on error.
+ */
+int osmo_gtlvs_decode(void *decoded_struct, unsigned int obj_ofs, struct osmo_gtlv_load *gtlv, bool tlv_ordered,
+		     const struct osmo_gtlv_coding *ie_coding,
+		     osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs)
+{
+	if (!ie_coding)
+		return -ENOTSUP;
+	if (tlv_ordered)
+		return osmo_gtlvs_decode_ordered(decoded_struct, obj_ofs, gtlv, ie_coding, err_cb, err_cb_data, iei_strs);
+	else
+		return osmo_gtlvs_decode_unordered(decoded_struct, obj_ofs, gtlv, ie_coding, err_cb, err_cb_data,
+						  iei_strs);
+}
+
+/*! Encode a TLV structure from decoded struct to raw data.
+ * How to encode IE values and where to read them in the decoded struct is defined by ie_coding, an array terminated by
+ * a '{}' entry.
+ * The IEs will be encoded in the order they appear in ie_coding.
+ * \param[out] gtlv  Write data using this TLV definition to gtlv->dst.
+ * \param[in] decoded_struct  C struct data to encode.
+ * \param[in] obj_ofs  Nesting offset, pass as 0.
+ * \param[in] ie_coding  A {} terminated list of IEI tags to encode (if present) and instructions for encoding.
+ * \param[in] err_cb  Function to call to report an error message, or NULL.
+ * \param[in] err_cb_data  Caller supplied context to pass to the err_cb as 'data' argument.
+ * \param[in] iei_strs  value_string array to give IEI names in error messages passed to err_cb(), or NULL.
+ * \return 0 on success, negative on error.
+ */
+int osmo_gtlvs_encode(struct osmo_gtlv_put *gtlv, const void *decoded_struct, unsigned int obj_ofs,
+		     const struct osmo_gtlv_coding *ie_coding,
+		     osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs)
+{
+	void *obj = MEMB(decoded_struct, obj_ofs);
+
+	if (!ie_coding)
+		return -ENOTSUP;
+
+	for (; !osmo_gtlv_coding_end(ie_coding); ie_coding++) {
+		int rc;
+		bool *presence_flag_p = ie_coding->has_presence_flag ? MEMB(obj, ie_coding->presence_flag_ofs) : NULL;
+		unsigned int *multi_count_p = ie_coding->has_count ? MEMB(obj, ie_coding->count_ofs) : NULL;
+		unsigned int n;
+		unsigned int i;
+
+		if (presence_flag_p && !*presence_flag_p)
+			continue;
+
+		if (multi_count_p) {
+			n = *multi_count_p;
+			if (!ie_coding->memb_array_pitch)
+				RETURN_ERROR(-EFAULT, ie_coding->ti,
+					     "Error in protocol definition: The ie_coding lacks a memb_array_pitch"
+					     " value, cannot be used as multi-IE\n");
+		} else {
+			n = 1;
+		}
+
+		for (i = 0; i < n; i++) {
+			unsigned int memb_ofs;
+
+			osmo_gtlv_put_tli(gtlv, &ie_coding->ti, 0);
+
+			/* If this is a repeated IE, encode from the correct array index */
+			if (multi_count_p && i >= ie_coding->count_max)
+				RETURN_ERROR(-ENOTSUP, ie_coding->ti,
+					     "Only %u instances of this IE are supported per message", ie_coding->count_max);
+			memb_ofs = ie_coding->memb_ofs + i * ie_coding->memb_array_pitch;
+
+			if (ie_coding->nested_ies) {
+				struct osmo_gtlv_put nested_tlv = {
+					.cfg = ie_coding->nested_ies_cfg ? : gtlv->cfg,
+					.dst = gtlv->dst,
+				};
+				rc = osmo_gtlvs_encode(&nested_tlv, decoded_struct, obj_ofs + memb_ofs,
+						      ie_coding->nested_ies, err_cb, err_cb_data, iei_strs);
+				if (rc)
+					RETURN_ERROR(rc, ie_coding->ti,
+						     "Error while encoding TLV structure nested inside this IE");
+			} else {
+				rc = ie_coding->enc_func(gtlv, decoded_struct, MEMB(obj, memb_ofs));
+				if (rc)
+					RETURN_ERROR(rc, ie_coding->ti, "Error while encoding this IE");
+			}
+
+			osmo_gtlv_put_update_tl(gtlv);
+		}
+	}
+	return 0;
+}
+
+/*! Compose a human readable string describing a decoded struct.
+ * How to encode IE values and where to read them in the decoded struct is defined by ie_coding, an array terminated by
+ * a '{}' entry.
+ * The IEs will be encoded in the order they appear in ie_coding.
+ * \param[out] buf  Return the string in this buffer.
+ * \param[in] buflen  Size of buf.
+ * \param[in] decoded_struct  C struct data to encode.
+ * \param[in] obj_ofs  Nesting offset, pass as 0.
+ * \param[in] ie_coding  A {} terminated list of IEI tags to encode (if present) and instructions for encoding.
+ * \param[in] iei_strs  value_string array to give IEI names in tag headers, or NULL.
+ * \return number of characters that would be written if the buffer is large enough, like snprintf().
+ */
+int osmo_gtlvs_encode_to_str_buf(char *buf, size_t buflen, const void *decoded_struct, unsigned int obj_ofs,
+				const struct osmo_gtlv_coding *ie_coding, const struct value_string *iei_strs)
+{
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+
+	void *obj = MEMB(decoded_struct, obj_ofs);
+
+	if (!ie_coding)
+		return -ENOTSUP;
+
+	for (; !osmo_gtlv_coding_end(ie_coding); ie_coding++) {
+		bool *presence_flag_p = ie_coding->has_presence_flag ? MEMB(obj, ie_coding->presence_flag_ofs) : NULL;
+		unsigned int *multi_count_p = ie_coding->has_count ? MEMB(obj, ie_coding->count_ofs) : NULL;
+		unsigned int n;
+		unsigned int i;
+
+		if (presence_flag_p && !*presence_flag_p)
+			continue;
+
+		if (multi_count_p) {
+			n = *multi_count_p;
+		} else {
+			n = 1;
+		}
+
+		if (!n)
+			continue;
+
+		OSMO_STRBUF_PRINTF(sb, " '%s'=", get_value_string(iei_strs, ie_coding->ti.tag));
+		if (multi_count_p)
+			OSMO_STRBUF_PRINTF(sb, "{ ");
+
+		for (i = 0; i < n; i++) {
+			unsigned int memb_ofs;
+
+			/* If this is a repeated IE, encode from the correct array index */
+			if (multi_count_p && i >= ie_coding->count_max)
+				return -ENOTSUP;
+			if (i > 0)
+				OSMO_STRBUF_PRINTF(sb, ", ");
+
+			memb_ofs = ie_coding->memb_ofs + i * ie_coding->memb_array_pitch;
+
+			if (ie_coding->nested_ies) {
+				OSMO_STRBUF_PRINTF(sb, "{");
+				OSMO_STRBUF_APPEND(sb, osmo_gtlvs_encode_to_str_buf, decoded_struct, obj_ofs + memb_ofs,
+						   ie_coding->nested_ies, iei_strs);
+				OSMO_STRBUF_PRINTF(sb, " }");
+			} else {
+				if (ie_coding->enc_to_str_func)
+					OSMO_STRBUF_APPEND(sb, ie_coding->enc_to_str_func, MEMB(obj, memb_ofs));
+				else
+					OSMO_STRBUF_PRINTF(sb, "(enc_to_str_func==NULL)");
+			}
+		}
+
+		if (multi_count_p)
+			OSMO_STRBUF_PRINTF(sb, " }");
+	}
+	return sb.chars_needed;
+}
+
+/*! Compose a human readable string describing a decoded struct.
+ * Like osmo_gtlvs_encode_to_str_buf() but returns a talloc allocated string.
+ * \param[in] ctx  talloc context to allocate from, e.g. OTC_SELECT.
+ * \param[in] decoded_struct  C struct data to encode.
+ * \param[in] obj_ofs  Nesting offset, pass as 0.
+ * \param[in] ie_coding  A {} terminated list of IEI tags to encode (if present) and instructions for encoding.
+ * \param[in] iei_strs  value_string array to give IEI names in tag headers, or NULL.
+ * \return human readable string.
+ */
+char *osmo_gtlvs_encode_to_str_c(void *ctx, const void *decoded_struct, unsigned int obj_ofs,
+				const struct osmo_gtlv_coding *ie_coding, const struct value_string *iei_strs)
+{
+	OSMO_NAME_C_IMPL(ctx, 256, "ERROR", osmo_gtlvs_encode_to_str_buf, decoded_struct, obj_ofs, ie_coding, iei_strs)
+}

src/libosmo-gtlv/gtlv_gen.c

@@ -0,0 +1,420 @@
+/* Write h and c source files for TLV protocol definitions, based on very sparse TLV definitions.
+ * For a usage example see tests/libosmo-gtlv/test_gtlv_gen/. */
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <string.h>
+
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/utils.h>
+
+#include <osmocom/gtlv/gtlv_gen.h>
+
+static const struct osmo_gtlv_gen_cfg *g_cfg = NULL;
+
+const struct osmo_gtlv_gen_ie osmo_gtlv_gen_ie_auto = {};
+
+/* Helps avoid redundant definitions of the same type. */
+struct seen_entry {
+	struct llist_head entry;
+	char str[256];
+	const void *from_def;
+};
+static LLIST_HEAD(seen_list);
+
+static bool seen(const char *str, const void *from_def)
+{
+	struct seen_entry *s;
+	llist_for_each_entry(s, &seen_list, entry) {
+		if (!strcmp(s->str, str)) {
+			if (from_def != s->from_def) {
+				fprintf(stderr, "ERROR: %s: multiple definitions use the same name: '%s'\n",
+					g_cfg->proto_name, str);
+				exit(1);
+			}
+			return true;
+		}
+	}
+	s = talloc_zero(NULL, struct seen_entry);
+	OSMO_STRLCPY_ARRAY(s->str, str);
+	s->from_def = from_def;
+	llist_add(&s->entry, &seen_list);
+	return false;
+}
+static void clear_seen()
+{
+	struct seen_entry *s;
+	while ((s = llist_first_entry_or_null(&seen_list, struct seen_entry, entry))) {
+		llist_del(&s->entry);
+		talloc_free(s);
+	}
+}
+
+/* Return "struct foo_ie_bar" from g_cfg->decoded_type_prefix and ie. */
+static inline const char *decoded_type(const struct osmo_gtlv_gen_ie_o *ie_o)
+{
+	static char b[255];
+	const struct osmo_gtlv_gen_ie *ie = ie_o->ie;
+	const char *tag_name;
+	if (ie && ie->decoded_type)
+		return ie->decoded_type;
+	/* "struct foo_ie_" + "bar" = struct foo_ie_bar*/
+	tag_name = ie ? ie->tag_name : NULL;
+	snprintf(b, sizeof(b), "%s%s", g_cfg->decoded_type_prefix, tag_name ? : ie_o->name);
+	return b;
+}
+
+/* --- .h file --- */
+
+/* Write a listing of struct members like
+ *     bool foo_present;
+ *     int foo;
+ *     struct myproto_ie_bar bar;
+ *     struct abc abc[10];
+ *     int abc_count;
+ */
+static void write_ie_members(const struct osmo_gtlv_gen_ie_o ies[])
+{
+	const struct osmo_gtlv_gen_ie_o *ie_o;
+	for (ie_o = ies; ie_o->ie; ie_o++) {
+		if (ie_o->optional)
+			printf("\tbool %s_present;\n", ie_o->name);
+		printf("\t%s %s", decoded_type(ie_o), ie_o->name);
+		if (ie_o->multi) {
+			printf("[%u];\n", ie_o->multi);
+			printf("\tunsigned int %s_count", ie_o->name);
+		}
+		printf(";\n");
+	}
+}
+
+/* Traverse nesting levels in the message definitions and generate the structs for all as needed. */
+static void write_ie_auto_structs(const struct osmo_gtlv_gen_ie_o ies[])
+{
+	const struct osmo_gtlv_gen_ie_o *ie_o;
+	if (!ies)
+		return;
+	for (ie_o = ies; ie_o->ie; ie_o++) {
+		const struct osmo_gtlv_gen_ie *ie = ie_o->ie;
+		if (!ie || !ie->nested_ies)
+			continue;
+		/* Recurse to write inner layers first, so that they can be referenced in outer layers. */
+		write_ie_auto_structs(ie->nested_ies);
+
+		/* Various IE definitions can use the same underlying type. Only generate each type once. */
+		if (seen(decoded_type(ie_o), NULL))
+			continue;
+
+		/* Print:
+		 *
+		 * \* spec ref *\
+		 * struct myproto_ie_goo {
+		 *     bool foo_present;
+		 *     int foo;
+		 *     struct myproto_ie_bar bar;
+		 *     struct abc abc[10];
+		 *     int abc_count;
+		 * };
+		 */
+		printf("\n");
+		if (ie->spec_ref)
+			printf("/* %s%s */\n", g_cfg->spec_ref_prefix, ie->spec_ref);
+		printf("%s {\n", decoded_type(ie_o));
+		write_ie_members(ie->nested_ies);
+		printf("};\n");
+	}
+}
+
+/* Write all auto-generated structs, starting with the outer message definitions and nesting into all contained IE
+ * definitions. */
+static void write_auto_structs()
+{
+	const struct osmo_gtlv_gen_msg *gen_msg;
+	clear_seen();
+	for (gen_msg = g_cfg->msg_defs; gen_msg->name; gen_msg++) {
+		write_ie_auto_structs(gen_msg->ies);
+	}
+}
+
+/* Write the struct definitions for each message, i.e. for each entry in the outer PDU's message union, as well as the
+ * union itself.
+ *
+ * struct myproto_msg_foo {
+ *    ...
+ * }:
+ * struct myproto_msg_goo {
+ *    ...
+ * };
+ * union myproto_ies {
+ *        myproto_msg_foo foo;
+ *        myproto_msg_goo goo;
+ * };
+ */
+static void write_msg_union()
+{
+	const struct osmo_gtlv_gen_msg *gen_msg;
+	for (gen_msg = g_cfg->msg_defs; gen_msg->name; gen_msg++) {
+		/* "struct foo_msg" + "_%s" { *
+		 * struct foo_msg_goo_request { ... }; */
+		printf("\nstruct %s_msg_%s {\n",
+		       g_cfg->proto_name,
+		       gen_msg->name);
+		write_ie_members(gen_msg->ies);
+		printf("};\n");
+	}
+
+	printf("\nunion %s_ies {\n", g_cfg->proto_name);
+	for (gen_msg = g_cfg->msg_defs; gen_msg->name; gen_msg++) {
+		printf("\tstruct %s_msg_%s %s;\n", g_cfg->proto_name,
+		       gen_msg->name, gen_msg->name);
+	}
+	printf("};\n");
+}
+
+/* Write the C header, myproto_ies_auto.h */
+static void write_h()
+{
+	printf("/* THIS FILE IS GENERATED FROM %s */\n", __FILE__);
+	printf("#include <stdint.h>\n");
+	printf("#include <osmocom/gtlv/gtlv_dec_enc.h>\n");
+	if (g_cfg->h_header)
+		printf("\n%s\n", g_cfg->h_header);
+	write_auto_structs();
+	write_msg_union();
+	printf("\nconst struct osmo_gtlv_coding *%s_get_msg_coding(%s message_type);\n",
+	       g_cfg->proto_name, g_cfg->message_type_enum ? : "int");
+	printf("\n"
+		"int %s_ies_decode(union %s_ies *dst, struct osmo_gtlv_load *gtlv, bool tlv_ordered,\n"
+		"	%s message_type, osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs);\n",
+		g_cfg->proto_name, g_cfg->proto_name, g_cfg->message_type_enum ? : "int");
+	printf("\n"
+		"int %s_ies_encode(struct osmo_gtlv_put *gtlv, const union %s_ies *src,\n"
+		"	%s message_type, osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs);\n",
+		g_cfg->proto_name, g_cfg->proto_name, g_cfg->message_type_enum ? : "int");
+	printf("\n"
+		"int %s_ies_encode_to_str(char *buf, size_t buflen, const union %s_ies *src,\n"
+		"	%s message_type, const struct value_string *iei_strs);\n",
+		g_cfg->proto_name, g_cfg->proto_name, g_cfg->message_type_enum ? : "int");
+}
+
+/* --- .c file --- */
+
+/* Write a listing of:
+ * extern int myproto_dec_foo(...);
+ * extern int myproto_enc_foo(...);
+ */
+static void write_extern_dec_enc(const struct osmo_gtlv_gen_ie_o *ies)
+{
+	const struct osmo_gtlv_gen_ie_o *ie_o;
+	for (ie_o = ies; ie_o->ie; ie_o++) {
+		const struct osmo_gtlv_gen_ie *ie = ie_o->ie;
+		const char *dec_enc = ie_o->name;
+		if (ie)
+			dec_enc = ie->dec_enc ? : (ie->tag_name ? : ie_o->name);
+		if (ie && ie->nested_ies) {
+			write_extern_dec_enc(ie->nested_ies);
+			continue;
+		}
+		if (seen(dec_enc, NULL))
+			continue;
+		printf("extern int %s_dec_%s(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv);\n",
+		       g_cfg->proto_name, dec_enc);
+		printf("extern int %s_enc_%s(struct osmo_gtlv_put *gtlv, const void *decoded_struct, const void *encode_from);\n",
+		       g_cfg->proto_name, dec_enc);
+		if (g_cfg->add_enc_to_str)
+			printf("extern int %s_enc_to_str_%s(char *buf, size_t buflen, const void *encode_from);\n",
+			       g_cfg->proto_name, dec_enc);
+	}
+}
+
+/* For a nested IE, write the struct osmo_gtlv_coding array of the inner IEs.
+ * { { MYPROTO_IEI_BAR },
+ *   .memb_ofs = offsetof(struct myproto_foo, bar),
+ *   .dec_func = myproto_dec_bar,
+ *   .enc_func = myproto_enc_bar,
+ * },
+ */
+static void write_ies_array(const char *indent, const struct osmo_gtlv_gen_ie_o *ies, const char *obj_type, const char *substruct)
+{
+#define printi(FMT, ARGS...) printf("%s" FMT, indent, ##ARGS)
+
+	const struct osmo_gtlv_gen_ie_o *ie_o;
+	for (ie_o = ies; ie_o->ie; ie_o++) {
+		const struct osmo_gtlv_gen_ie *ie = ie_o->ie;
+		const char *tag_name = (ie && ie->tag_name) ? ie->tag_name : ie_o->name;
+		printi("{ { %s%s", g_cfg->tag_prefix, osmo_str_toupper(tag_name));
+		if (ie_o->instance)
+			printf(", true, %s", ie_o->instance);
+		printf(" },\n");
+		printi("  .memb_ofs = offsetof(%s, %s%s),\n", obj_type, substruct, ie_o->name);
+		if (ie->nested_ies) {
+			printi("  .nested_ies = ies_in_%s,\n", tag_name);
+		} else {
+			const char *dec_enc = ie->dec_enc ? : (ie->tag_name ? : ie_o->name);
+			printi("  .dec_func = %s_dec_%s,\n", g_cfg->proto_name, dec_enc);
+			printi("  .enc_func = %s_enc_%s,\n", g_cfg->proto_name, dec_enc);
+			if (g_cfg->add_enc_to_str)
+				printi("  .enc_to_str_func = %s_enc_to_str_%s,\n", g_cfg->proto_name, dec_enc);
+		}
+		if (ie_o->multi) {
+			printi("  .memb_array_pitch = OSMO_MEMB_ARRAY_PITCH(%s, %s%s),\n",
+			       obj_type, substruct, ie_o->name);
+			printi("  .has_count = true, .count_max = %u,\n", ie_o->multi);
+			printi("  .count_mandatory = %u,\n", ie_o->multi_mandatory);
+			printi("  .count_ofs = offsetof(%s, %s%s_count),\n", obj_type, substruct, ie_o->name);
+		}
+		if (ie_o->optional) {
+			printi("  .has_presence_flag = true,\n");
+			printi("  .presence_flag_ofs = offsetof(%s, %s%s_present),\n", obj_type, substruct, ie_o->name);
+		}
+		printi("},\n");
+	}
+}
+
+/* For a nested IE, write the struct osmo_gtlv_coding array of the inner IEs.
+ * static const struct osmo_gtlv_coding ies_in_foo[] = {
+ *         { {MYPROTO_IEI_BAR},
+ *           .memb_ofs = offsetof(struct myproto_foo, bar),
+ *           .dec_func = myproto_dec_bar,
+ *           .enc_func = myproto_enc_bar,
+ *         },
+ *         ...
+ * };
+ */
+static void write_nested_ies_array(const struct osmo_gtlv_gen_ie_o *ies)
+{
+	const char *indent = "\t";
+	const struct osmo_gtlv_gen_ie_o *ie_o;
+	for (ie_o = ies; ie_o->ie; ie_o++) {
+		const struct osmo_gtlv_gen_ie *ie = ie_o->ie;
+		if (!ie || !ie->nested_ies)
+			continue;
+		write_nested_ies_array(ie->nested_ies);
+
+		const char *ies_in_name = ie->tag_name ? : ie_o->name;
+		if (seen(ies_in_name, ie))
+			continue;
+
+		printf("\nstatic const struct osmo_gtlv_coding ies_in_%s[] = {\n", ies_in_name);
+		write_ies_array(indent, ie->nested_ies, decoded_type(ie_o), "");
+		printi("{}\n");
+		printf("};\n");
+	}
+}
+
+/* Write the bulk of the C code: on the basis of the list of messages (g_cfg->msg_defs), write all dec/enc function
+ * declarations, all IEs arrays as well as the list of message types, first triggering to write the C code for any inner
+ * layers. */
+static void write_c()
+{
+	const struct osmo_gtlv_gen_msg *gen_msg;
+
+	printf("/* THIS FILE IS GENERATED FROM %s */\n", __FILE__);
+	printf("#include <stddef.h>\n");
+	printf("#include <errno.h>\n");
+	printf("#include <osmocom/core/utils.h>\n");
+	printf("#include <osmocom/gtlv/gtlv.h>\n");
+	printf("#include <osmocom/gtlv/gtlv_dec_enc.h>\n");
+	printf("#include <osmocom/gtlv/gtlv_gen.h>\n");
+	if (g_cfg->c_header)
+		printf("\n%s\n", g_cfg->c_header);
+
+	printf("\n");
+	clear_seen();
+	for (gen_msg = g_cfg->msg_defs; gen_msg->name; gen_msg++) {
+		write_extern_dec_enc(gen_msg->ies);
+	}
+
+	clear_seen();
+	for (gen_msg = g_cfg->msg_defs; gen_msg->name; gen_msg++) {
+		write_nested_ies_array(gen_msg->ies);
+	}
+
+	for (gen_msg = g_cfg->msg_defs; gen_msg->name; gen_msg++) {
+		char *obj_type = talloc_asprintf(NULL, "union %s_ies", g_cfg->proto_name);
+		char *substruct = talloc_asprintf(NULL, "%s.", gen_msg->name);
+		printf("\nstatic const struct osmo_gtlv_coding ies_in_msg_%s[] = {\n", gen_msg->name);
+		write_ies_array("\t", gen_msg->ies, obj_type, substruct);
+		printf("\t{}\n};\n");
+		talloc_free(substruct);
+		talloc_free(obj_type);
+	}
+	printf("\nstatic const struct osmo_gtlv_coding *msg_defs[] = {\n");
+	for (gen_msg = g_cfg->msg_defs; gen_msg->name; gen_msg++) {
+		printf("\t[%s%s] = ies_in_msg_%s,\n", g_cfg->message_type_prefix, osmo_str_toupper(gen_msg->name), gen_msg->name);
+	}
+	printf("};\n");
+
+	/* print this code snippet into the .c file, because only there can we do ARRAY_SIZE(foo_msg_coding). */
+	printf("\n"
+		"const struct osmo_gtlv_coding *%s_get_msg_coding(%s message_type)\n"
+		"{\n"
+		"	if (message_type >= ARRAY_SIZE(msg_defs))\n"
+		"		return NULL;\n"
+		"	return msg_defs[message_type];\n"
+		"}\n",
+		g_cfg->proto_name, g_cfg->message_type_enum ? : "int");
+
+	printf("\n"
+		"int %s_ies_decode(union %s_ies *dst, struct osmo_gtlv_load *gtlv, bool tlv_ordered,\n"
+		"	%s message_type,\n"
+		"	osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs)\n"
+		"{\n"
+		"	return osmo_gtlvs_decode(dst, 0, gtlv, tlv_ordered, %s_get_msg_coding(message_type), err_cb, err_cb_data, iei_strs);\n"
+		"}\n",
+		g_cfg->proto_name, g_cfg->proto_name, g_cfg->message_type_enum ? : "int", g_cfg->proto_name);
+	printf("\n"
+		"int %s_ies_encode(struct osmo_gtlv_put *gtlv, const union %s_ies *src,\n"
+		"	%s message_type, osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs)\n"
+		"{\n"
+		"	return osmo_gtlvs_encode(gtlv, src, 0, %s_get_msg_coding(message_type), err_cb, err_cb_data, iei_strs);\n"
+		"}\n",
+		g_cfg->proto_name, g_cfg->proto_name, g_cfg->message_type_enum ? : "int", g_cfg->proto_name);
+	printf("\n"
+		"int %s_ies_encode_to_str(char *buf, size_t buflen, const union %s_ies *src,\n"
+		"	%s message_type, const struct value_string *iei_strs)\n"
+		"{\n"
+		"	return osmo_gtlvs_encode_to_str_buf(buf, buflen, src, 0, %s_get_msg_coding(message_type), iei_strs);\n"
+		"}\n",
+		g_cfg->proto_name, g_cfg->proto_name, g_cfg->message_type_enum ? : "int", g_cfg->proto_name);
+}
+
+/* Call this from your main(). */
+int osmo_gtlv_gen_main(const struct osmo_gtlv_gen_cfg *cfg, int argc, const char **argv)
+{
+	if (argc < 2)
+		return 1;
+
+	g_cfg = cfg;
+
+	if (strcmp(argv[1], "h") == 0)
+		write_h();
+	else if (strcmp(argv[1], "c") == 0)
+		write_c();
+	else
+		return 1;
+
+	clear_seen();
+	return 0;
+}

src/libosmo-pfcp/Makefile.am

@@ -0,0 +1,63 @@
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir)/include \
+	-I$(top_builddir) \
+	-I$(builddir) \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(NULL)
+
+AM_LDFLAGS = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)
+
+noinst_LIBRARIES = \
+	libosmo-pfcp.a \
+	$(NULL)
+
+libosmo_pfcp_a_SOURCES = \
+	pfcp_endpoint.c \
+	pfcp_heartbeat_fsm.c \
+	pfcp_ies_custom.c \
+	pfcp_msg.c \
+	pfcp_strs.c \
+	\
+	pfcp_ies_auto.c \
+	$(NULL)
+
+BUILT_SOURCES = \
+	pfcp_ies_auto.c \
+	$(NULL)
+
+CLEANFILES = \
+	pfcp_ies_auto.c \
+	$(NULL)
+
+pfcp_ies_auto.c: $(srcdir)/gen__pfcp_ies_auto.c \
+		 $(top_srcdir)/src/libosmo-gtlv/gtlv_gen.c \
+		 $(top_srcdir)/include/osmocom/gtlv/gtlv_gen.h
+	$(MAKE) -C $(top_builddir)/src/libosmo-gtlv
+	$(MAKE) gen__pfcp_ies_auto
+	$(builddir)/gen__pfcp_ies_auto c > $(builddir)/pfcp_ies_auto.c
+
+noinst_PROGRAMS = \
+	gen__pfcp_ies_auto \
+	$(NULL)
+
+gen__pfcp_ies_auto_SOURCES = \
+	gen__pfcp_ies_auto.c \
+	$(NULL)
+
+gen__pfcp_ies_auto_LDADD = \
+	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)

src/libosmo-pfcp/gen__pfcp_ies_auto.c

@@ -0,0 +1,365 @@
+/* Tool to generate C source code of structs and IE arrays for de- and encoding PFCP messages. */
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/gtlv/gtlv_gen.h>
+
+#define O OSMO_GTLV_GEN_O
+#define M OSMO_GTLV_GEN_M
+#define O_MULTI OSMO_GTLV_GEN_O_MULTI
+#define M_MULTI OSMO_GTLV_GEN_M_MULTI
+#define ALL_FROM_NAME osmo_gtlv_gen_ie_auto
+
+#define Ms(MEMB_NAME) M(MEMB_NAME, #MEMB_NAME)
+#define Os(MEMB_NAME) O(MEMB_NAME, #MEMB_NAME)
+#define O_MULTIs(N, MEMB_NAME) O_MULTI(N, MEMB_NAME, #MEMB_NAME)
+#define M_MULTIs(N, M, MEMB_NAME) M_MULTI(N, M, MEMB_NAME, #MEMB_NAME)
+
+static const struct osmo_gtlv_gen_ie recovery_time_stamp = {
+	"uint32_t",
+	.dec_enc = "32be",
+	.spec_ref = "7.4.2",
+};
+
+static const struct osmo_gtlv_gen_ie cause = {
+	"enum osmo_pfcp_cause",
+	.spec_ref = "8.2.1",
+};
+
+static const struct osmo_gtlv_gen_ie offending_ie = {
+	.decoded_type = "enum osmo_pfcp_iei",
+	.spec_ref = "8.2.22",
+};
+
+static const struct osmo_gtlv_gen_ie f_seid = {
+	.tag_name = "f_seid",
+	.spec_ref = "8.2.37",
+};
+
+static const struct osmo_gtlv_gen_ie pdr_id = {
+	.decoded_type = "uint16_t",
+	.dec_enc = "16be",
+	.spec_ref = "8.2.36",
+};
+
+static const struct osmo_gtlv_gen_ie precedence = {
+	.decoded_type = "uint32_t",
+	.dec_enc = "32be",
+	.spec_ref = "8.2.11",
+};
+
+static const struct osmo_gtlv_gen_ie source_iface = {
+	.decoded_type = "enum osmo_pfcp_source_iface",
+	.spec_ref = "8.2.2",
+};
+
+static const struct osmo_gtlv_gen_ie f_teid = {
+	.tag_name = "f_teid",
+	.spec_ref = "8.2.3",
+};
+
+static const struct osmo_gtlv_gen_ie traffic_endpoint_id = {
+	.tag_name = "traffic_endpoint_id",
+	.decoded_type = "uint8_t",
+	.dec_enc = "8",
+	.spec_ref = "8.2.92",
+};
+
+static const struct osmo_gtlv_gen_ie iface_type = {
+	.decoded_type = "enum osmo_pfcp_3gpp_iface_type",
+	.tag_name = "3gpp_iface_type",
+	.spec_ref = "8.2.118",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_pdi[] = {
+	Ms(source_iface),
+	O(f_teid, "local_f_teid"),
+	O(ALL_FROM_NAME, "ue_ip_address"),
+	Os(traffic_endpoint_id),
+	O(iface_type, "source_iface_type"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie pdi = {
+	.nested_ies = ies_in_pdi,
+	.spec_ref = "7.5.2.2-2",
+};
+
+static const struct osmo_gtlv_gen_ie far_id = {
+	.decoded_type = "uint32_t",
+	.dec_enc = "32be",
+	.spec_ref = "8.2.74",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_create_pdr[] = {
+	Ms(pdr_id),
+	Ms(precedence),
+	Ms(pdi),
+	O(ALL_FROM_NAME, "outer_header_removal"),
+	Os(far_id),
+	O(ALL_FROM_NAME, "activate_predefined_rules"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie create_pdr = {
+	.nested_ies = ies_in_create_pdr,
+	.spec_ref = "7.5.2.2",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_created_pdr[] = {
+	Ms(pdr_id),
+	O(f_teid, "local_f_teid"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie created_pdr = {
+	.nested_ies = ies_in_created_pdr,
+	.spec_ref = "7.5.3.2",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_upd_pdr[] = {
+	Ms(pdr_id),
+	O(ALL_FROM_NAME, "outer_header_removal"),
+	Os(pdi),
+	Os(far_id),
+	O(ALL_FROM_NAME, "activate_predefined_rules"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie upd_pdr = {
+	.nested_ies = ies_in_upd_pdr,
+	.spec_ref = "7.5.4.2",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_updated_pdr[] = {
+	Ms(pdr_id),
+	O(f_teid, "local_f_teid"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie updated_pdr = {
+	.nested_ies = ies_in_updated_pdr,
+	.spec_ref = "7.5.9.3",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_remove_pdr[] = {
+	Ms(pdr_id),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie remove_pdr = {
+	.nested_ies = ies_in_remove_pdr,
+	.spec_ref = "7.5.4.6",
+};
+
+static const struct osmo_gtlv_gen_ie destination_iface = {
+	.decoded_type = "enum osmo_pfcp_dest_iface",
+	.dec_enc = "dest_iface",
+	.spec_ref = "8.2.24",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_forw_params[] = {
+	Ms(destination_iface),
+	O(ALL_FROM_NAME, "network_inst"),
+	O(ALL_FROM_NAME, "outer_header_creation"),
+	O(traffic_endpoint_id, "linked_te_id"),
+	O(iface_type, "destination_iface_type"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie forw_params = {
+	.nested_ies = ies_in_forw_params,
+	.spec_ref = "7.5.2.3-2",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_upd_forw_params[] = {
+	Os(destination_iface),
+	O(ALL_FROM_NAME, "network_inst"),
+	O(ALL_FROM_NAME, "outer_header_creation"),
+	O(traffic_endpoint_id, "linked_te_id"),
+	O(iface_type, "destination_iface_type"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie upd_forw_params = {
+	.nested_ies = ies_in_upd_forw_params,
+	.spec_ref = "7.5.4.3-2",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_create_far[] = {
+	Ms(far_id),
+	M(ALL_FROM_NAME, "apply_action"),
+	Os(forw_params),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie create_far = {
+	.nested_ies = ies_in_create_far,
+	.spec_ref = "7.5.2.3",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_remove_far[] = {
+	Ms(far_id),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie remove_far = {
+	.nested_ies = ies_in_remove_far,
+	.spec_ref = "7.5.4.6",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_upd_far[] = {
+	Ms(far_id),
+	O(ALL_FROM_NAME, "apply_action"),
+	Os(upd_forw_params),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie upd_far = {
+	.nested_ies = ies_in_upd_far,
+	.spec_ref = "7.5.4.3",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_heartbeat_req[] = {
+	Ms(recovery_time_stamp),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_heartbeat_resp[] = {
+	Ms(recovery_time_stamp),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_assoc_setup_req[] = {
+	M(ALL_FROM_NAME, "node_id"),
+	Ms(recovery_time_stamp),
+	O(ALL_FROM_NAME, "up_function_features"),
+	O(ALL_FROM_NAME, "cp_function_features"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_assoc_setup_resp[] = {
+	M(ALL_FROM_NAME, "node_id"),
+	Ms(cause),
+	Ms(recovery_time_stamp),
+	O(ALL_FROM_NAME, "up_function_features"),
+	O(ALL_FROM_NAME, "cp_function_features"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_assoc_release_req[] = {
+	M(ALL_FROM_NAME, "node_id"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_assoc_release_resp[] = {
+	M(ALL_FROM_NAME, "node_id"),
+	Ms(cause),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_session_est_req[] = {
+	M(ALL_FROM_NAME, "node_id"),
+	O(f_seid, "cp_f_seid"),
+	M_MULTIs(32, 1, create_pdr),
+	M_MULTI(32, 1, create_far, "create_far"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_session_est_resp[] = {
+	M(ALL_FROM_NAME, "node_id"),
+	Ms(cause),
+	Os(offending_ie),
+	O(f_seid, "up_f_seid"),
+	O_MULTIs(32, created_pdr),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_session_mod_req[] = {
+	O(f_seid, "cp_f_seid"),
+	O_MULTIs(32, remove_pdr),
+	O_MULTIs(32, remove_far),
+	O_MULTIs(32, create_pdr),
+	O_MULTIs(32, create_far),
+	O_MULTIs(32, upd_pdr),
+	O_MULTIs(32, upd_far),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_session_mod_resp[] = {
+	Ms(cause),
+	Os(offending_ie),
+	O_MULTIs(32, created_pdr),
+	O_MULTIs(32, updated_pdr),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_session_del_req[] = {
+	/* no IEs */
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_msg_session_del_resp[] = {
+	Ms(cause),
+	{}
+};
+
+#define MSG(NAME) { #NAME, ies_in_msg_##NAME }
+static const struct osmo_gtlv_gen_msg pfcp_msg_defs[] = {
+	MSG(heartbeat_req),
+	MSG(heartbeat_resp),
+	MSG(assoc_setup_req),
+	MSG(assoc_setup_resp),
+	MSG(assoc_release_req),
+	MSG(assoc_release_resp),
+	MSG(session_est_req),
+	MSG(session_est_resp),
+	MSG(session_mod_req),
+	MSG(session_mod_resp),
+	MSG(session_del_req),
+	MSG(session_del_resp),
+	{}
+};
+
+int main(int argc, const char **argv)
+{
+	struct osmo_gtlv_gen_cfg cfg = {
+		.proto_name = "osmo_pfcp",
+		.spec_ref_prefix = "3GPP TS 29.244 ",
+		.message_type_enum = "enum osmo_pfcp_message_type",
+		.message_type_prefix = "OSMO_PFCP_MSGT_",
+		.tag_enum = "enum osmo_pfcp_iei",
+		.tag_prefix = "OSMO_PFCP_IEI_",
+		.decoded_type_prefix = "struct osmo_pfcp_ie_",
+		.h_header = "#include <osmocom/pfcp/pfcp_ies_custom.h>",
+		.c_header = "#include <osmocom/pfcp/pfcp_ies_auto.h>",
+		.msg_defs = pfcp_msg_defs,
+		.add_enc_to_str = true,
+	};
+	return osmo_gtlv_gen_main(&cfg, argc, argv);
+}

src/libosmo-pfcp/pfcp_endpoint.c

@@ -0,0 +1,416 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <errno.h>
+#include <unistd.h>
+#include <time.h>
+
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/tdef.h>
+
+#include <osmocom/pfcp/pfcp_endpoint.h>
+#include <osmocom/pfcp/pfcp_msg.h>
+
+/*! Entry of pfcp_endpoint message queue of PFCP messages, for re-transsions. */
+struct osmo_pfcp_queue_entry {
+	/* entry in per-peer list of messages waiting for a response */
+	struct llist_head entry;
+	/* back-pointer */
+	struct osmo_pfcp_endpoint *ep;
+	/* message we have transmitted */
+	struct osmo_pfcp_msg *m;
+	/* T1 timer: How long to wait for response before retransmitting */
+	struct osmo_timer_list t1;
+	/* N1: number of pending re-transmissions */
+	unsigned int n1_remaining;
+};
+
+/* find a matching osmo_pfcp_queue_entry for given rx_hdr */
+static struct osmo_pfcp_queue_entry *
+osmo_pfcp_queue_find(struct llist_head *queue, const struct osmo_pfcp_msg *rx)
+{
+	struct osmo_pfcp_queue_entry *qe;
+	/* It's important to match only a Request to a Response and vice versa, because the remote peer makes its own
+	 * sequence_nr. There could be a collision of sequence_nr. But as long as all Requests look for a Response and
+	 * vice versa, the sequence_nr scopes don't overlap. */
+	llist_for_each_entry(qe, queue, entry) {
+		if (qe->m->is_response != rx->is_response
+		    && qe->m->h.sequence_nr == rx->h.sequence_nr)
+			return qe;
+	}
+	return NULL;
+}
+
+/* clean up and deallocate the given osmo_pfcp_queue_entry */
+static void osmo_pfcp_queue_del(struct osmo_pfcp_queue_entry *qe)
+{
+	/* see also the talloc destructor */
+	talloc_free(qe);
+}
+
+int osmo_pfcp_queue_destructor(struct osmo_pfcp_queue_entry *qe)
+{
+	osmo_timer_del(&qe->t1);
+	llist_del(&qe->entry);
+	return 0;
+}
+
+struct osmo_tdef osmo_pfcp_tdefs[] = {
+	{ .T = -19, .default_val = 15, .unit = OSMO_TDEF_S,
+	  .desc = "PFCP Heartbeat Request period, how long to wait between issuing requests"
+	},
+	{ .T = -20, .default_val = 15, .unit = OSMO_TDEF_S,
+	  .desc = "PFCP Heartbeat Response timeout, the time after which to regard a non-responding peer as disconnected"
+	},
+	{ .T = -21, .default_val = 15, .unit = OSMO_TDEF_S,
+	  .desc = "PFCP peer graceful shutdown timeout, how long to keep the peer's state after a peer requested"
+		  " graceful shutdown"
+	},
+	{ .T = OSMO_PFCP_TIMER_T1, .default_val = 3000, .unit = OSMO_TDEF_MS,
+	  .desc = "PFCP request timeout, how long after a missing response to retransmit a PFCP request"
+	},
+	{ .T = OSMO_PFCP_TIMER_N1, .default_val = 3, .unit = OSMO_TDEF_CUSTOM,
+	  .desc = "Number of PFCP request retransmission attempts"
+	},
+	{ .T = OSMO_PFCP_TIMER_KEEP_RESP, .default_val = 10000, .unit = OSMO_TDEF_MS,
+	  .desc = "PFCP response timeout, how long to keep a response, in case its same request is retransmitted by the peer"
+	},
+	{}
+};
+
+
+struct osmo_pfcp_endpoint *osmo_pfcp_endpoint_create(void *ctx, void *priv)
+{
+	struct osmo_pfcp_endpoint *ep = talloc_zero(ctx, struct osmo_pfcp_endpoint);
+	uint32_t unix_time;
+	if (!ep)
+		return NULL;
+
+	INIT_LLIST_HEAD(&ep->retrans_queue);
+
+	ep->cfg.tdefs = osmo_pfcp_tdefs;
+	ep->priv = priv;
+	ep->pfcp_fd.fd = -1;
+
+	/* time() returns seconds since 1970 (UNIX epoch), but the recovery_time_stamp is coded in the NTP format, which is
+	 * seconds since 1900, the NTP era 0. 2208988800L is the offset between UNIX epoch and NTP era 0.
+	 * TODO: what happens when we enter NTP era 1? Is it sufficient to integer-wrap? */
+	unix_time = time(NULL);
+	ep->recovery_time_stamp = unix_time + 2208988800L;
+	LOGP(DLPFCP, LOGL_NOTICE, "PFCP endpoint: recovery timestamp = 0x%08x (%u seconds since UNIX epoch,"
+	     " which is %u seconds since NTP era 0; IETF RFC 5905)\n",
+	     ep->recovery_time_stamp, unix_time, ep->recovery_time_stamp);
+
+	return ep;
+}
+
+uint32_t osmo_pfcp_endpoint_next_seq_nr(struct osmo_pfcp_endpoint *ep)
+{
+	ep->seq_nr_state++;
+	ep->seq_nr_state &= 0xffffff;
+	return ep->seq_nr_state;
+}
+
+static unsigned int ep_n1(struct osmo_pfcp_endpoint *ep)
+{
+	return osmo_tdef_get(ep->cfg.tdefs, OSMO_PFCP_TIMER_N1, OSMO_TDEF_CUSTOM, -1);
+}
+
+unsigned int ep_t1(struct osmo_pfcp_endpoint *ep)
+{
+	return osmo_tdef_get(ep->cfg.tdefs, OSMO_PFCP_TIMER_T1, OSMO_TDEF_MS, -1);
+}
+
+unsigned int ep_keep_resp(struct osmo_pfcp_endpoint *ep)
+{
+	return osmo_tdef_get(ep->cfg.tdefs, OSMO_PFCP_TIMER_KEEP_RESP, OSMO_TDEF_MS, -1);
+}
+
+/* Return true to keep the message in the queue, false for dropping from the queue. */
+static bool pfcp_queue_retrans(struct osmo_pfcp_queue_entry *qe)
+{
+	struct osmo_pfcp_endpoint *endpoint = qe->ep;
+	unsigned int t1_ms = ep_t1(endpoint);
+	struct osmo_pfcp_msg *m = qe->m;
+	int rc;
+
+	/* re-transmit */
+	if (qe->n1_remaining)
+		qe->n1_remaining--;
+	OSMO_LOG_PFCP_MSG(m, LOGL_DEBUG, "re-sending (%u attempts remaining)\n", qe->n1_remaining);
+
+	rc = osmo_pfcp_endpoint_tx_data(endpoint, m);
+	/* If encoding failed, it cannot ever succeed. Drop the queue entry. */
+	if (rc)
+		return false;
+	/* if no more attempts remaining, drop from queue */
+	if (!qe->n1_remaining)
+		return false;
+	/* re-schedule timer, keep in queue */
+	osmo_timer_schedule(&qe->t1, t1_ms/1000, t1_ms%1000);
+	return true;
+}
+
+/* T1 for a given queue entry has expired */
+static void pfcp_queue_timer_cb(void *data)
+{
+	struct osmo_pfcp_queue_entry *qe = data;
+	bool keep;
+
+	if (qe->m->is_response) {
+		/* The response has waited in the queue for any retransmissions of its initiating request. Now that time
+		 * has passed and the response can be dropped from the queue. */
+		keep = false;
+	} else {
+		/* The request is still here, which means it has not received a response from the remote side.
+		 * Retransmit the request. */
+		keep = pfcp_queue_retrans(qe);
+	}
+
+	if (keep)
+		return;
+	/* Drop the queue entry. No more retransmissions. */
+	/* FIXME: notify user */
+	osmo_pfcp_queue_del(qe);
+}
+
+/* Directly encode and transmit the message, without storing in the retrans_queue. */
+int osmo_pfcp_endpoint_tx_data_no_logging(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m)
+{
+	struct msgb *msg;
+	int rc;
+
+	msg = msgb_alloc_c(OTC_SELECT, OSMO_PFCP_MSGB_ALLOC_SIZE, "PFCP-tx");
+	rc = osmo_pfcp_msg_encode(msg, m);
+	if (rc)
+		return rc;
+
+	rc = sendto(ep->pfcp_fd.fd, msgb_data(msg), msgb_length(msg), 0,
+		    (struct sockaddr*)&m->remote_addr, sizeof(m->remote_addr));
+	if (rc != msgb_length(msg))
+		return -EIO;
+	return 0;
+}
+
+int osmo_pfcp_endpoint_tx_data(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m)
+{
+	OSMO_LOG_PFCP_MSG(m, LOGL_INFO, "sending\n");
+	return osmo_pfcp_endpoint_tx_data_no_logging(ep, m);
+}
+
+
+int osmo_pfcp_endpoint_tx_heartbeat_req(struct osmo_pfcp_endpoint *ep, const struct osmo_sockaddr *remote_addr)
+{
+	struct osmo_pfcp_msg *tx = osmo_pfcp_msg_alloc_tx(OTC_SELECT, remote_addr, NULL, NULL,
+							  OSMO_PFCP_MSGT_HEARTBEAT_REQ);
+	tx->ies.heartbeat_req.recovery_time_stamp = ep->recovery_time_stamp;
+	tx->h.sequence_nr = osmo_pfcp_endpoint_next_seq_nr(ep);
+	return osmo_pfcp_endpoint_tx_data(ep, tx);
+}
+
+/* add a given msgb to the queue of per-peer messages waiting for a response */
+static int osmo_pfcp_endpoint_retrans_queue_add(struct osmo_pfcp_endpoint *endpoint, struct osmo_pfcp_msg *m)
+{
+	struct osmo_pfcp_queue_entry *qe;
+	unsigned int n1 = ep_n1(endpoint);
+	unsigned int t1_ms = ep_t1(endpoint);
+	unsigned int keep_resp_ms = ep_keep_resp(endpoint);
+	unsigned int timeout = m->is_response ? keep_resp_ms : t1_ms;
+
+	LOGP(DLPFCP, LOGL_DEBUG, "retransmit unanswered Requests %u x %ums; keep sent Responses for %ums\n",
+	     n1, t1_ms, keep_resp_ms);
+	/* If there are no retransmissions or no timeout, it makes no sense to add to the queue. */
+	if (!n1 || !t1_ms)
+		return 0;
+
+	qe = talloc(endpoint, struct osmo_pfcp_queue_entry);
+	OSMO_ASSERT(qe);
+	*qe = (struct osmo_pfcp_queue_entry){
+		.ep = endpoint,
+		.m = m,
+		.n1_remaining = m->is_response ? 0 : n1,
+	};
+	talloc_steal(qe, m);
+	llist_add_tail(&qe->entry, &endpoint->retrans_queue);
+	talloc_set_destructor(qe, osmo_pfcp_queue_destructor);
+
+	osmo_timer_setup(&qe->t1, pfcp_queue_timer_cb, qe);
+	osmo_timer_schedule(&qe->t1, timeout/1000, timeout%1000);
+	return 0;
+}
+
+/* Transmit a PFCP message.
+ * Store the message in the local message queue for possible retransmissions. */
+int osmo_pfcp_endpoint_tx(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m)
+{
+	struct osmo_pfcp_ie_node_id *node_id;
+	if (!m->is_response)
+		m->h.sequence_nr = osmo_pfcp_endpoint_next_seq_nr(ep);
+	node_id = osmo_pfcp_msg_node_id(m);
+	if (node_id)
+		*node_id = ep->cfg.local_node_id;
+
+	osmo_pfcp_endpoint_retrans_queue_add(ep, m);
+	return osmo_pfcp_endpoint_tx_data(ep, m);
+}
+
+static void osmo_pfcp_endpoint_handle_rx(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m)
+{
+	bool dispatch_rx = true;
+	struct osmo_pfcp_queue_entry *prev_msg;
+
+	OSMO_LOG_PFCP_MSG(m, LOGL_INFO, "received\n");
+
+	if (m->h.message_type == OSMO_PFCP_MSGT_HEARTBEAT_REQ) {
+		/* Directly answer with a Heartbeat Response. Still also dispatch the Rx event to the peer. */
+		struct osmo_pfcp_msg *resp = osmo_pfcp_msg_alloc_tx(OTC_SELECT, NULL, NULL, m, OSMO_PFCP_MSGT_HEARTBEAT_RESP);
+		resp->ies.heartbeat_resp.recovery_time_stamp = ep->recovery_time_stamp;
+		osmo_pfcp_endpoint_tx_data(ep, resp);
+	}
+
+	/* If this is receiving a response, search for matching request that is now completed.
+	 * If this is receiving a request, search for a matching response that can be retransmitted.
+	 * Either way see if a matching sequence_nr is already in the queue. */
+	prev_msg = osmo_pfcp_queue_find(&ep->retrans_queue, m);
+	if (prev_msg) {
+		if (m->is_response && !prev_msg->m->is_response) {
+			/* Got a response, the original request is now ACKed and can be dropped from the retransmission
+			 * queue. */
+			osmo_pfcp_queue_del(prev_msg);
+		} else if (!m->is_response && prev_msg->m->is_response) {
+			/* Got a request, but we have already sent a response to this same request earlier. Retransmit
+			 * the same response, and don't dispatch the msg rx. Keep our response queued in case the
+			 * request is retransmitted yet another time. */
+
+			OSMO_LOG_PFCP_MSG(prev_msg->m, LOGL_INFO, "re-sending cached response\n");
+			osmo_pfcp_endpoint_tx_data_no_logging(ep, prev_msg->m);
+			dispatch_rx = false;
+		}
+	}
+
+	if (dispatch_rx)
+		ep->rx_msg(ep, m);
+}
+
+/* call-back for PFCP socket file descriptor */
+static int osmo_pfcp_fd_cb(struct osmo_fd *ofd, unsigned int what)
+{
+	int rc;
+	struct osmo_pfcp_endpoint *ep = ofd->data;
+
+	if (what & OSMO_FD_READ) {
+		struct osmo_sockaddr remote;
+		socklen_t remote_len = sizeof(remote);
+		struct msgb *msg = msgb_alloc_c(OTC_SELECT, OSMO_PFCP_MSGB_ALLOC_SIZE, "PFCP-rx");
+		if (!msg)
+			return -ENOMEM;
+
+		msg->l3h = msg->tail;
+		rc = recvfrom(ofd->fd, msg->tail, msgb_tailroom(msg), 0, (struct sockaddr *)&remote, &remote_len);
+		if (rc <= 0)
+			return -EIO;
+		msgb_put(msg, rc);
+
+		OSMO_ASSERT(ep->rx_msg);
+
+		/* This may be a bundle of PFCP messages. Parse and receive each message received, by shifting l4h
+		 * through the message bundle. */
+		msg->l4h = msg->l3h;
+		while (msgb_l4len(msg)) {
+			struct osmo_gtlv_load tlv;
+			struct osmo_pfcp_msg *m = osmo_pfcp_msg_alloc_rx(OTC_SELECT, &remote);
+
+			rc = osmo_pfcp_msg_decode_header(&tlv, m, msg);
+			if (rc < 0)
+				break;
+			msg->l4h += rc;
+
+			rc = osmo_pfcp_msg_decode_tlv(m, &tlv);
+			if (rc)
+				break;
+
+			/* Populate message context to point at peer and session, if applicable */
+			if (ep->set_msg_ctx)
+				ep->set_msg_ctx(ep, m);
+
+			osmo_pfcp_endpoint_handle_rx(ep, m);
+		}
+	}
+	return 0;
+}
+
+/*! bind a PFCP endpoint to its configured address (ep->cfg.local_addr).
+ * \return 0 on success, negative on error. */
+int osmo_pfcp_endpoint_bind(struct osmo_pfcp_endpoint *ep)
+{
+	int rc;
+	/* close the existing socket, if any */
+	osmo_pfcp_endpoint_close(ep);
+
+	if (!ep->rx_msg) {
+		LOGP(DLPFCP, LOGL_ERROR, "missing rx_msg cb at osmo_pfcp_endpoint\n");
+		return -EINVAL;
+	}
+
+	/* create the new socket, binding to configured local address */
+	ep->pfcp_fd.cb = osmo_pfcp_fd_cb;
+	ep->pfcp_fd.data = ep;
+	rc = osmo_sock_init_osa_ofd(&ep->pfcp_fd, SOCK_DGRAM, IPPROTO_UDP, &ep->cfg.local_addr, NULL, OSMO_SOCK_F_BIND);
+	if (rc < 0)
+		return rc;
+	return 0;
+}
+
+void osmo_pfcp_endpoint_close(struct osmo_pfcp_endpoint *ep)
+{
+	struct osmo_pfcp_queue_entry *qe;
+	while ((qe = llist_first_entry_or_null(&ep->retrans_queue, struct osmo_pfcp_queue_entry, entry))) {
+		osmo_pfcp_queue_del(qe);
+	}
+
+	if (ep->pfcp_fd.fd != -1) {
+		osmo_fd_unregister(&ep->pfcp_fd);
+		close(ep->pfcp_fd.fd);
+		ep->pfcp_fd.fd = -1;
+	}
+}
+
+void osmo_pfcp_endpoint_free(struct osmo_pfcp_endpoint **ep)
+{
+	if (!*ep)
+		return;
+	osmo_pfcp_endpoint_close(*ep);
+	talloc_free(*ep);
+	*ep = NULL;
+}
+
+#if 0
+void osmo_pfcp_endpoint_invalidate_ctx(struct osmo_pfcp_endpoint *ep, struct osmo_fsm_inst *deleted_fi)
+{
+	struct osmo_pfcp_queue_entry *qe;
+	llist_for_each_entry(qe, &ep->retrans_queue, entry) {
+		osmo_pfcp_msg_invalidate_ctx(qe->m, deleted_fi);
+	}
+}
+#endif

src/libosmo-pfcp/pfcp_heartbeat_fsm.c

@@ -0,0 +1,179 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <osmocom/core/utils.h>
+#include <osmocom/core/fsm.h>
+#include <osmocom/core/tdef.h>
+
+#include <osmocom/pfcp/pfcp_heartbeat_fsm.h>
+
+enum heartbeat_fsm_state {
+	HEARTBEAT_ST_IDLE,
+	HEARTBEAT_ST_WAIT_RESP,
+};
+
+static const struct value_string heartbeat_fsm_event_names[] = {
+	OSMO_VALUE_STRING(OSMO_PFCP_HEARTBEAT_EV_RX_RESP),
+	OSMO_VALUE_STRING(OSMO_PFCP_HEARTBEAT_EV_RX_REQ),
+	{}
+};
+
+static struct osmo_fsm heartbeat_fsm;
+
+static const struct osmo_tdef_state_timeout heartbeat_fsm_timeouts[32] = {
+	[HEARTBEAT_ST_IDLE] = { .T = 0 },
+	[HEARTBEAT_ST_WAIT_RESP] = { .T = 0 },
+};
+
+/* Transition to a state, using the T timer defined in heartbeat_fsm_timeouts.
+ * Assumes local variable fi exists. */
+#define heartbeat_state_chg(state) \
+	osmo_tdef_fsm_inst_state_chg(fi, state, \
+				     heartbeat_fsm_timeouts, \
+				     ((struct heartbeat*)(fi->priv))->tdefs, \
+				     5)
+
+struct heartbeat {
+	struct osmo_fsm_inst *fi;
+	uint32_t parent_event_tx_heartbeat;
+	struct osmo_tdef *tdefs;
+};
+
+struct osmo_fsm_inst *osmo_pfcp_heartbeat_alloc(struct osmo_fsm_inst *parent_fi,
+						uint32_t parent_event_tx_heartbeat, uint32_t parent_event_term,
+						struct osmo_tdef *tdefs)
+{
+	struct heartbeat *heartbeat;
+
+	struct osmo_fsm_inst *fi = osmo_fsm_inst_alloc_child(&heartbeat_fsm, parent_fi, parent_event_term);
+	OSMO_ASSERT(fi);
+
+	heartbeat = talloc(fi, struct heartbeat);
+	OSMO_ASSERT(heartbeat);
+	fi->priv = heartbeat;
+	*heartbeat = (struct heartbeat){
+		.fi = fi,
+		.parent_event_tx_heartbeat = parent_event_tx_heartbeat,
+		.tdefs = tdefs,
+	};
+
+	return heartbeat->fi;
+}
+
+static int heartbeat_fsm_timer_cb(struct osmo_fsm_inst *fi)
+{
+	/* Return 1 to terminate FSM instance, 0 to keep running */
+	switch (fi->state) {
+	case HEARTBEAT_ST_IDLE:
+		/* Time for another heartbeat request */
+		heartbeat_state_chg(HEARTBEAT_ST_WAIT_RESP);
+		return 0;
+	case HEARTBEAT_ST_WAIT_RESP:
+		/* Response did not arrive. Emit parent_event_term to the parent_fi. */
+		return 1;
+	default:
+		OSMO_ASSERT(false);
+	}
+}
+
+static void pfcp_heartbeat_idle_action(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+	switch (event) {
+
+	case OSMO_PFCP_HEARTBEAT_EV_RX_RESP:
+		/* A retransmission? */
+	case OSMO_PFCP_HEARTBEAT_EV_RX_REQ:
+		/* Either way, if we've seen any Heartbeat message from the peer, consider a Heartbeat to have succeeded
+		 * and restart the idle timeout. */
+		heartbeat_state_chg(HEARTBEAT_ST_IDLE);
+		return;
+
+	default:
+		OSMO_ASSERT(false);
+	}
+}
+
+static void pfcp_heartbeat_wait_resp_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
+{
+	struct heartbeat *heartbeat = fi->priv;
+	/* Let the caller's implementation figure out how exactly to encode the Heartbeat Request and send it.
+	 * Just dispatching events here. */
+	osmo_fsm_inst_dispatch(fi->proc.parent, heartbeat->parent_event_tx_heartbeat, NULL);
+}
+
+static void pfcp_heartbeat_wait_resp_action(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+	switch (event) {
+
+	case OSMO_PFCP_HEARTBEAT_EV_RX_RESP:
+		heartbeat_state_chg(HEARTBEAT_ST_IDLE);
+		break;
+
+	case OSMO_PFCP_HEARTBEAT_EV_RX_REQ:
+		/* Doesn't matter whether the peer is also requesting, still waiting for the response to our own
+		 * request. */
+		break;
+
+	default:
+		OSMO_ASSERT(false);
+	}
+}
+
+#define S(x)    (1 << (x))
+
+static const struct osmo_fsm_state heartbeat_fsm_states[] = {
+	[HEARTBEAT_ST_IDLE] = {
+		.name = "idle",
+		.in_event_mask = 0
+			,
+		.out_state_mask = 0
+			| S(HEARTBEAT_ST_WAIT_RESP)
+			,
+		.action = pfcp_heartbeat_idle_action,
+	},
+	[HEARTBEAT_ST_WAIT_RESP] = {
+		.name = "wait_resp",
+		.in_event_mask = 0
+			| S(OSMO_PFCP_HEARTBEAT_EV_RX_RESP)
+			| S(OSMO_PFCP_HEARTBEAT_EV_RX_REQ)
+			,
+		.out_state_mask = 0
+			,
+		.onenter = pfcp_heartbeat_wait_resp_onenter,
+		.action = pfcp_heartbeat_wait_resp_action,
+	},
+};
+
+static struct osmo_fsm pfcp_heartbeat_fsm = {
+	.name = "pfcp_heartbeat",
+	.states = heartbeat_fsm_states,
+	.num_states = ARRAY_SIZE(heartbeat_fsm_states),
+	.log_subsys = DLPFCP,
+	.event_names = heartbeat_fsm_event_names,
+	.timer_cb = heartbeat_fsm_timer_cb,
+};
+
+static __attribute__((constructor)) void pfcp_heartbeat_fsm_register(void)
+{
+	OSMO_ASSERT(osmo_fsm_register(&pfcp_heartbeat_fsm) == 0);
+}

src/libosmo-pfcp/pfcp_ies_custom.c

@@ -0,0 +1,990 @@
+/* Decoded PFCP IEs, to be used by the auto-generated pfcp_ies_auto.c. */
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <errno.h>
+#include <inttypes.h>
+
+#include <osmocom/core/socket.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
+
+#include <osmocom/gtlv/gtlv.h>
+
+#include <osmocom/pfcp/pfcp_ies_custom.h>
+#include <osmocom/pfcp/pfcp_strs.h>
+#include <osmocom/pfcp/pfcp_msg.h>
+
+/* Assumes presence of local variable osmo_pfcp_msg *m. m->log_ctx may be NULL. */
+#define RETURN_ERROR(RC, FMT, ARGS...) \
+	do {\
+		OSMO_ASSERT(decoded_struct); \
+		OSMO_LOG_PFCP_MSG(OSMO_PFCP_MSG_FOR_IES(decoded_struct), LOGL_ERROR, FMT " (%d: %s)\n", ##ARGS, RC, \
+				  strerror((RC) > 0 ? (RC) : -(RC))); \
+		return RC; \
+	} while (0)
+
+/* Assumes presence of local variable osmo_gtlv_load *tlv. Usage:
+ *   ENSURE_LENGTH_IS_EXACTLY(2);
+ */
+#define ENSURE_LENGTH_IS_EXACTLY(VAL) \
+	do { \
+		if (!(tlv->len == VAL)) \
+			RETURN_ERROR(-EINVAL, "IE has length = %zu, expected length == " #VAL, tlv->len); \
+	} while (0)
+
+/* Assumes presence of local variable osmo_gtlv_load *tlv. Usage:
+ *   ENSURE_LENGTH_IS_AT_LEAST(1);
+ */
+#define ENSURE_LENGTH_IS_AT_LEAST(VAL) \
+	do { \
+		if (!(tlv->len >= VAL)) \
+			RETURN_ERROR(-EINVAL, "IE has length = %zu, expected length >= " #VAL, tlv->len); \
+	} while (0)
+
+/* Assumes presence of local variable osmo_gtlv_load *tlv. Usage:
+ *   const uint8_t *pos = tlv->val;
+ *   ENSURE_REMAINING_LENGTH_IS_AT_LEAST("first part", pos, 23);
+ *   <parse first part>
+ *   pos += 23;
+ *   ENSURE_REMAINING_LENGTH_IS_AT_LEAST("very long part", pos, 235);
+ *   <parse very long part>
+ *   pos += 235;
+ */
+#define ENSURE_REMAINING_LENGTH_IS_AT_LEAST(NAME, POS, MIN_VAL) \
+	do { \
+		if (!((tlv->len - ((POS) - tlv->val)) >= MIN_VAL)) \
+			RETURN_ERROR(-EINVAL, \
+				     "at value octet %d: %zu octets remaining, but " #NAME " requires length >= " #MIN_VAL, \
+				     (int)((POS) - tlv->val), \
+				     tlv->len - ((POS) - tlv->val)); \
+	} while (0)
+
+void osmo_pfcp_ie_f_seid_set(struct osmo_pfcp_ie_f_seid *f_seid, uint64_t seid, const struct osmo_sockaddr *remote_addr)
+{
+	*f_seid = (struct osmo_pfcp_ie_f_seid) {
+		.seid = seid,
+	};
+	osmo_pfcp_ip_addrs_set(&f_seid->ip_addr, remote_addr);
+}
+
+int osmo_pfcp_dec_cause(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	enum osmo_pfcp_cause *cause = decode_to;
+	ENSURE_LENGTH_IS_EXACTLY(1);
+	*cause = *tlv->val;
+	return 0;
+}
+
+int osmo_pfcp_enc_cause(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const enum osmo_pfcp_cause *cause = encode_from;
+	msgb_put_u8(tlv->dst, *cause);
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_cause(char *buf, size_t buflen, const void *encode_from)
+{
+	const enum osmo_pfcp_cause *cause = encode_from;
+	return snprintf(buf, buflen, "%s", osmo_pfcp_cause_str(*cause));
+}
+
+int osmo_pfcp_dec_offending_ie(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	enum osmo_pfcp_iei *offending_ie = decode_to;
+	ENSURE_LENGTH_IS_EXACTLY(2);
+	*offending_ie = osmo_load16be(tlv->val);
+	return 0;
+}
+
+int osmo_pfcp_enc_offending_ie(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const enum osmo_pfcp_iei *offending_ie = encode_from;
+	msgb_put_u16(tlv->dst, *offending_ie);
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_offending_ie(char *buf, size_t buflen, const void *encode_from)
+{
+	const enum osmo_pfcp_iei *offending_ie = encode_from;
+	return snprintf(buf, buflen, "%s", osmo_pfcp_iei_str(*offending_ie));
+}
+
+int osmo_pfcp_dec_8(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	uint8_t *u8 = decode_to;
+	ENSURE_LENGTH_IS_AT_LEAST(1);
+	*u8 = tlv->val[0];
+	return 0;
+}
+
+int osmo_pfcp_enc_8(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const uint8_t *u8 = encode_from;
+	msgb_put_u8(tlv->dst, *u8);
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_8(char *buf, size_t buflen, const void *encode_from)
+{
+	const uint8_t *u8 = encode_from;
+	return snprintf(buf, buflen, "%u", *u8);
+}
+
+int osmo_pfcp_dec_16be(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	uint16_t *u16 = decode_to;
+	ENSURE_LENGTH_IS_AT_LEAST(2);
+	*u16 = osmo_load16be(tlv->val);
+	return 0;
+}
+
+int osmo_pfcp_enc_16be(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const uint16_t *u16 = encode_from;
+	msgb_put_u16(tlv->dst, *u16);
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_16be(char *buf, size_t buflen, const void *encode_from)
+{
+	const uint16_t *u16 = encode_from;
+	return snprintf(buf, buflen, "%u", *u16);
+}
+
+int osmo_pfcp_dec_32be(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	uint32_t *u32 = decode_to;
+	ENSURE_LENGTH_IS_AT_LEAST(4);
+	*u32 = osmo_load32be(tlv->val);
+	return 0;
+}
+
+int osmo_pfcp_enc_32be(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const uint32_t *u32 = encode_from;
+	msgb_put_u32(tlv->dst, *u32);
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_32be(char *buf, size_t buflen, const void *encode_from)
+{
+	const uint32_t *u32 = encode_from;
+	return snprintf(buf, buflen, "%u", *u32);
+}
+
+int osmo_pfcp_dec_3gpp_iface_type(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	enum osmo_pfcp_3gpp_iface_type *_3gpp_iface_type = decode_to;
+	ENSURE_LENGTH_IS_AT_LEAST(1);
+	*_3gpp_iface_type = tlv->val[0] & 0x3f;
+	return 0;
+}
+
+int osmo_pfcp_enc_3gpp_iface_type(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const enum osmo_pfcp_3gpp_iface_type *_3gpp_iface_type = encode_from;
+	msgb_put_u8(tlv->dst, (uint8_t)(*_3gpp_iface_type) & 0x3f);
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_3gpp_iface_type(char *buf, size_t buflen, const void *encode_from)
+{
+	const enum osmo_pfcp_3gpp_iface_type *_3gpp_iface_type = encode_from;
+	return snprintf(buf, buflen, "%s", osmo_pfcp_3gpp_iface_type_str(*_3gpp_iface_type));
+}
+
+int osmo_pfcp_dec_source_iface(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	enum osmo_pfcp_source_iface *source_iface = decode_to;
+	ENSURE_LENGTH_IS_AT_LEAST(1);
+	*source_iface = tlv->val[0] & 0xf;
+	return 0;
+}
+
+int osmo_pfcp_enc_source_iface(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const enum osmo_pfcp_source_iface *source_iface = encode_from;
+	msgb_put_u8(tlv->dst, (uint8_t)(*source_iface) & 0xf);
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_source_iface(char *buf, size_t buflen, const void *encode_from)
+{
+	const enum osmo_pfcp_source_iface *source_iface = encode_from;
+	return snprintf(buf, buflen, "%s", osmo_pfcp_source_iface_str(*source_iface));
+}
+
+int osmo_pfcp_dec_dest_iface(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	enum osmo_pfcp_dest_iface *dest_interface = decode_to;
+	ENSURE_LENGTH_IS_AT_LEAST(1);
+	*dest_interface = tlv->val[0] & 0xf;
+	return 0;
+}
+
+int osmo_pfcp_enc_dest_iface(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const enum osmo_pfcp_dest_iface *dest_interface = encode_from;
+	msgb_put_u8(tlv->dst, (uint8_t)(*dest_interface) & 0xf);
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_dest_iface(char *buf, size_t buflen, const void *encode_from)
+{
+	const enum osmo_pfcp_dest_iface *dest_iface = encode_from;
+	return snprintf(buf, buflen, "%s", osmo_pfcp_dest_iface_str(*dest_iface));
+}
+
+int osmo_pfcp_dec_node_id(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	struct osmo_pfcp_ie_node_id *node_id = decode_to;
+	const void *ip;
+	unsigned int ip_len;
+	unsigned int want_len;
+	ENSURE_LENGTH_IS_AT_LEAST(1);
+	node_id->type = *(uint8_t *)tlv->val;
+	ip = &tlv->val[1];
+	ip_len = tlv->len - 1;
+
+	switch (node_id->type) {
+	case OSMO_PFCP_NODE_ID_T_IPV4:
+		want_len = sizeof(node_id->ip.u.sin.sin_addr);
+		if (ip_len != want_len)
+			RETURN_ERROR(-EINVAL, "Node ID: wrong IPv4 address value length %u, expected %u",
+				     ip_len, want_len);
+		osmo_sockaddr_from_octets(&node_id->ip, ip, ip_len);
+		break;
+	case OSMO_PFCP_NODE_ID_T_IPV6:
+		want_len = sizeof(node_id->ip.u.sin6.sin6_addr);
+		if (ip_len != want_len)
+			RETURN_ERROR(-EINVAL, "Node ID: wrong IPv6 address value length %u, expected %u",
+				     ip_len, want_len);
+		osmo_sockaddr_from_octets(&node_id->ip, ip, ip_len);
+		break;
+	case OSMO_PFCP_NODE_ID_T_FQDN:
+		/* Copy and add a trailing nul */
+		OSMO_STRLCPY_ARRAY(node_id->fqdn, ip);
+		break;
+	default:
+		RETURN_ERROR(-EINVAL, "Invalid Node ID Type: %d", node_id->type);
+	}
+	return 0;
+}
+
+int osmo_pfcp_enc_node_id(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	unsigned int l;
+	const struct osmo_pfcp_ie_node_id *node_id = encode_from;
+	msgb_put_u8(tlv->dst, node_id->type);
+	switch (node_id->type) {
+	case OSMO_PFCP_NODE_ID_T_IPV4:
+		l = sizeof(node_id->ip.u.sin.sin_addr);
+		osmo_sockaddr_to_octets(msgb_put(tlv->dst, l), l, &node_id->ip);
+		break;
+	case OSMO_PFCP_NODE_ID_T_IPV6:
+		l = sizeof(node_id->ip.u.sin6.sin6_addr);
+		osmo_sockaddr_to_octets(msgb_put(tlv->dst, l), l, &node_id->ip);
+		break;
+	case OSMO_PFCP_NODE_ID_T_FQDN:
+		l = strnlen(node_id->fqdn, sizeof(node_id->fqdn));
+		/* Copy without trailing nul */
+		memcpy((char *)msgb_put(tlv->dst, l), node_id->fqdn, l);
+		break;
+	default:
+		RETURN_ERROR(-EINVAL, "Invalid Node ID Type: %d", node_id->type);
+	}
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_node_id(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_node_id *node_id = encode_from;
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+
+	switch (node_id->type) {
+	case OSMO_PFCP_NODE_ID_T_IPV4:
+		OSMO_STRBUF_PRINTF(sb, "v4:");
+		break;
+	case OSMO_PFCP_NODE_ID_T_IPV6:
+		OSMO_STRBUF_PRINTF(sb, "v6:");
+		break;
+	case OSMO_PFCP_NODE_ID_T_FQDN:
+		OSMO_STRBUF_PRINTF(sb, "fqdn:");
+		OSMO_STRBUF_APPEND(sb, osmo_quote_str_buf3,
+				   node_id->fqdn, strnlen(node_id->fqdn, sizeof(node_id->fqdn)));
+		return sb.chars_needed;
+	default:
+		OSMO_STRBUF_PRINTF(sb, "unknown-node-id-type-%u", node_id->type);
+		return sb.chars_needed;
+	}
+
+	OSMO_STRBUF_APPEND(sb, osmo_sockaddr_to_str_buf2, &node_id->ip);
+	return sb.chars_needed;
+}
+
+bool osmo_pfcp_bits_get(const uint8_t *bits, unsigned int bitpos)
+{
+	unsigned int bytenum = bitpos / 8;
+	unsigned int bitmask = 1 << (bitpos % 8);
+
+	return (bool)(bits[bytenum] & bitmask);
+}
+
+void osmo_pfcp_bits_set(uint8_t *bits, unsigned int bitpos, bool val)
+{
+	unsigned int bytenum = bitpos / 8;
+	unsigned int bitmask = 1 << (bitpos % 8);
+
+	if (val)
+		bits[bytenum] |= bitmask;
+	else
+		bits[bytenum] &= ~bitmask;
+}
+
+int osmo_pfcp_bits_to_str_buf(char *buf, size_t buflen, const uint8_t *bits, const struct value_string *bit_strs)
+{
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+	OSMO_STRBUF_PRINTF(sb, "(");
+	for (; bit_strs->str; bit_strs++) {
+		if (osmo_pfcp_bits_get(bits, bit_strs->value)) {
+			OSMO_STRBUF_PRINTF(sb, " %s", bit_strs->str);
+		}
+	}
+	OSMO_STRBUF_PRINTF(sb, " )");
+	return sb.chars_needed;
+}
+
+char *osmo_pfcp_bits_to_str_c(void *ctx, const uint8_t *bits, const struct value_string *bit_str)
+{
+	OSMO_NAME_C_IMPL(ctx, 64, "ERROR", osmo_pfcp_bits_to_str_buf, bits, bit_str)
+}
+
+int osmo_pfcp_dec_up_function_features(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	struct osmo_pfcp_ie_up_function_features *up_function_features = decode_to;
+	ENSURE_LENGTH_IS_AT_LEAST(6);
+	memcpy(up_function_features->bits, tlv->val, 6);
+	return 0;
+}
+
+int osmo_pfcp_enc_up_function_features(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_up_function_features *up_function_features = encode_from;
+	memcpy(msgb_put(tlv->dst, 6), up_function_features->bits, 6);
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_up_function_features(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_up_function_features *up_function_features = encode_from;
+	return osmo_pfcp_bits_to_str_buf(buf, buflen, up_function_features->bits, osmo_pfcp_up_feature_strs);
+}
+
+int osmo_pfcp_dec_cp_function_features(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	struct osmo_pfcp_ie_cp_function_features *cp_function_features = decode_to;
+	ENSURE_LENGTH_IS_AT_LEAST(sizeof(cp_function_features->bits));
+	memcpy(cp_function_features->bits, tlv->val, sizeof(cp_function_features->bits));
+	return 0;
+}
+
+int osmo_pfcp_enc_cp_function_features(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_cp_function_features *cp_function_features = encode_from;
+	memcpy(msgb_put(tlv->dst, sizeof(cp_function_features->bits)),
+	       cp_function_features->bits, sizeof(cp_function_features->bits));
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_cp_function_features(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_cp_function_features *cp_function_features = encode_from;
+	return osmo_pfcp_bits_to_str_buf(buf, buflen, cp_function_features->bits, osmo_pfcp_cp_feature_strs);
+}
+
+int osmo_pfcp_dec_f_seid(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	struct osmo_pfcp_ie_f_seid *f_seid = decode_to;
+	uint8_t flags;
+	uint8_t pos;
+	unsigned int l;
+	/* flags and 8 octet seid */
+	ENSURE_LENGTH_IS_AT_LEAST(9);
+	flags = tlv->val[0];
+	f_seid->ip_addr.v6_present = flags & 1;
+	f_seid->ip_addr.v4_present = flags & 2;
+	f_seid->seid = osmo_load64be(&tlv->val[1]);
+	pos = 9;
+	if (f_seid->ip_addr.v4_present) {
+		l = sizeof(f_seid->ip_addr.v4.u.sin.sin_addr);
+		if (pos + l > tlv->len)
+			RETURN_ERROR(-EINVAL, "F-SEID IE is too short for the IPv4 address: %zu", tlv->len);
+		osmo_sockaddr_from_octets(&f_seid->ip_addr.v4, &tlv->val[pos], l);
+		pos += l;
+	}
+	if (f_seid->ip_addr.v6_present) {
+		l = sizeof(f_seid->ip_addr.v4.u.sin6.sin6_addr);
+		if (pos + l > tlv->len)
+			RETURN_ERROR(-EINVAL, "F-SEID IE is too short for the IPv6 address: %zu", tlv->len);
+		osmo_sockaddr_from_octets(&f_seid->ip_addr.v6, &tlv->val[pos], l);
+		pos += l;
+	}
+	return 0;
+}
+
+int osmo_pfcp_enc_f_seid(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_f_seid *f_seid = encode_from;
+	unsigned int l;
+	uint8_t flags = (f_seid->ip_addr.v6_present ? 1 : 0) + (f_seid->ip_addr.v4_present ? 2 : 0);
+	/* flags and 8 octet seid */
+	msgb_put_u8(tlv->dst, flags);
+	osmo_store64be(f_seid->seid, msgb_put(tlv->dst, 8));
+
+	if (f_seid->ip_addr.v4_present) {
+		if (f_seid->ip_addr.v4.u.sin.sin_family != AF_INET)
+			RETURN_ERROR(-EINVAL,
+				     "f_seid IE indicates IPv4 address, but there is no ipv4_addr");
+		l = sizeof(f_seid->ip_addr.v4.u.sin.sin_addr);
+		osmo_sockaddr_to_octets(msgb_put(tlv->dst, l), l, &f_seid->ip_addr.v4);
+	}
+	if (f_seid->ip_addr.v6_present) {
+		if (f_seid->ip_addr.v6.u.sin6.sin6_family != AF_INET6)
+			RETURN_ERROR(-EINVAL,
+				     "f_seid IE indicates IPv6 address, but there is no ipv6_addr");
+		l = sizeof(f_seid->ip_addr.v6.u.sin6.sin6_addr);
+		osmo_sockaddr_to_octets(msgb_put(tlv->dst, l), l, &f_seid->ip_addr.v6);
+	}
+	return 0;
+}
+
+static int ip_addrs_to_str_buf(char *buf, size_t buflen, const struct osmo_pfcp_ip_addrs *addrs)
+{
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+	if (addrs->v4_present) {
+		OSMO_STRBUF_PRINTF(sb, ",v4:");
+		OSMO_STRBUF_APPEND(sb, osmo_sockaddr_to_str_buf2, &addrs->v4);
+	}
+	if (addrs->v6_present) {
+		OSMO_STRBUF_PRINTF(sb, ",v6:");
+		OSMO_STRBUF_APPEND(sb, osmo_sockaddr_to_str_buf2, &addrs->v6);
+	}
+	return sb.chars_needed;
+}
+
+int osmo_pfcp_enc_to_str_f_seid(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_f_seid *f_seid = encode_from;
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+	OSMO_STRBUF_PRINTF(sb, "0x%"PRIx64, f_seid->seid);
+	OSMO_STRBUF_APPEND(sb, ip_addrs_to_str_buf, &f_seid->ip_addr);
+	return sb.chars_needed;
+}
+
+int osmo_pfcp_dec_f_teid(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	struct osmo_pfcp_ie_f_teid *f_teid = decode_to;
+	uint8_t flags;
+	const uint8_t *pos;
+
+	*f_teid = (struct osmo_pfcp_ie_f_teid){};
+
+	pos = tlv->val;
+
+	ENSURE_REMAINING_LENGTH_IS_AT_LEAST("flags", pos, 1);
+	flags = *pos;
+	pos++;
+	f_teid->choose_flag = flags & 4;
+
+	if (!f_teid->choose_flag) {
+		/* A fixed TEID and address are provided */
+		f_teid->fixed.ip_addr.v4_present = flags & 1;
+		f_teid->fixed.ip_addr.v6_present = flags & 2;
+
+		ENSURE_REMAINING_LENGTH_IS_AT_LEAST("TEID", pos, 4);
+		f_teid->fixed.teid = osmo_load32be(pos);
+		pos += 4;
+
+		if (f_teid->fixed.ip_addr.v4_present) {
+			osmo_static_assert(sizeof(f_teid->fixed.ip_addr.v4.u.sin.sin_addr) == 4, sin_addr_size_is_4);
+			ENSURE_REMAINING_LENGTH_IS_AT_LEAST("IPv4 address", pos, 4);
+			osmo_sockaddr_from_octets(&f_teid->fixed.ip_addr.v4, pos, 4);
+			pos += 4;
+		}
+		if (f_teid->fixed.ip_addr.v6_present) {
+			osmo_static_assert(sizeof(f_teid->fixed.ip_addr.v6.u.sin6.sin6_addr) == 16, sin6_addr_size_is_16);
+			ENSURE_REMAINING_LENGTH_IS_AT_LEAST("IPv6 address", pos, 16);
+			osmo_sockaddr_from_octets(&f_teid->fixed.ip_addr.v6, pos, 16);
+			pos += 16;
+		}
+	} else {
+		/* CH flag is 1, choose an F-TEID. */
+		f_teid->choose.ipv4_addr = flags & 1;
+		f_teid->choose.ipv6_addr = flags & 2;
+		f_teid->choose.choose_id_present = flags & 8;
+
+		if (f_teid->choose.choose_id_present) {
+			ENSURE_REMAINING_LENGTH_IS_AT_LEAST("CHOOSE ID", pos, 1);
+			f_teid->choose.choose_id = *pos;
+			pos++;
+		}
+	}
+	return 0;
+}
+
+int osmo_pfcp_enc_f_teid(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_f_teid *f_teid = encode_from;
+	uint8_t flags;
+
+	flags = (f_teid->choose_flag ? 4 : 0);
+
+	if (!f_teid->choose_flag) {
+		/* A fixed TEID and address are provided */
+		flags |= (f_teid->fixed.ip_addr.v4_present ? 1 : 0)
+			 + (f_teid->fixed.ip_addr.v6_present ? 2 : 0);
+
+		msgb_put_u8(tlv->dst, flags);
+		msgb_put_u32(tlv->dst, f_teid->fixed.teid);
+
+		if (f_teid->fixed.ip_addr.v4_present) {
+			if (f_teid->fixed.ip_addr.v4.u.sin.sin_family != AF_INET)
+				RETURN_ERROR(-EINVAL,
+					     "f_teid IE indicates IPv4 address, but there is no ipv4_addr"
+					     " (sin_family = %d != AF_INET)", f_teid->fixed.ip_addr.v4.u.sin.sin_family);
+			osmo_sockaddr_to_octets(msgb_put(tlv->dst, 4), 4, &f_teid->fixed.ip_addr.v4);
+		}
+		if (f_teid->fixed.ip_addr.v6_present) {
+			if (f_teid->fixed.ip_addr.v6.u.sin6.sin6_family != AF_INET6)
+				RETURN_ERROR(-EINVAL,
+					     "f_teid IE indicates IPv6 address, but there is no ipv6_addr"
+					     " (sin6_family = %d != AF_INET6)", f_teid->fixed.ip_addr.v6.u.sin6.sin6_family);
+			osmo_sockaddr_to_octets(msgb_put(tlv->dst, 16), 16, &f_teid->fixed.ip_addr.v6);
+		}
+	} else {
+		flags |= (f_teid->choose.ipv4_addr ? 1 : 0)
+			 + (f_teid->choose.ipv6_addr ? 2 : 0)
+			 + (f_teid->choose.choose_id_present ? 8 : 0);
+		msgb_put_u8(tlv->dst, flags);
+		if (f_teid->choose.choose_id_present)
+			msgb_put_u8(tlv->dst, f_teid->choose.choose_id);
+	}
+	return 0;
+}
+
+int osmo_pfcp_ie_f_teid_to_str_buf(char *buf, size_t buflen, const struct osmo_pfcp_ie_f_teid *ft)
+{
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+	if (ft->choose_flag) {
+		OSMO_STRBUF_PRINTF(sb, "CHOOSE");
+		if (ft->choose.ipv4_addr)
+			OSMO_STRBUF_PRINTF(sb, "-v4");
+		if (ft->choose.ipv6_addr)
+			OSMO_STRBUF_PRINTF(sb, "-v6");
+		if (ft->choose.choose_id_present)
+			OSMO_STRBUF_PRINTF(sb, "-id%u", ft->choose.choose_id);
+	} else {
+		OSMO_STRBUF_PRINTF(sb, "TEID-0x%x", ft->fixed.teid);
+		OSMO_STRBUF_APPEND(sb, ip_addrs_to_str_buf, &ft->fixed.ip_addr);
+	}
+	return sb.chars_needed;
+}
+
+char *osmo_pfcp_ie_f_teid_to_str_c(void *ctx, const struct osmo_pfcp_ie_f_teid *ft)
+{
+	OSMO_NAME_C_IMPL(ctx, 64, "ERROR", osmo_pfcp_ie_f_teid_to_str_buf, ft)
+}
+
+int osmo_pfcp_enc_to_str_f_teid(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_f_teid *f_teid = encode_from;
+	return osmo_pfcp_ie_f_teid_to_str_buf(buf, buflen, f_teid);
+}
+
+int osmo_pfcp_dec_apply_action(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	struct osmo_pfcp_ie_apply_action *apply_action = decode_to;
+	ENSURE_LENGTH_IS_AT_LEAST(1);
+	*apply_action = (struct osmo_pfcp_ie_apply_action){};
+	memcpy(apply_action->bits, tlv->val, OSMO_MIN(tlv->len, sizeof(apply_action->bits)));
+	return 0;
+}
+
+int osmo_pfcp_enc_apply_action(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_apply_action *apply_action = encode_from;
+	memcpy(msgb_put(tlv->dst, sizeof(apply_action->bits)),
+	       apply_action->bits, sizeof(apply_action->bits));
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_apply_action(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_apply_action *apply_action = encode_from;
+	return osmo_pfcp_bits_to_str_buf(buf, buflen, apply_action->bits, osmo_pfcp_apply_action_strs);
+}
+
+int osmo_pfcp_dec_network_inst(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	struct osmo_pfcp_ie_network_inst *network_inst = decode_to;
+	osmo_strlcpy(network_inst->str, (const char *)tlv->val, OSMO_MIN(sizeof(network_inst->str), tlv->len+1));
+	return 0;
+}
+
+int osmo_pfcp_enc_network_inst(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_network_inst *network_inst = encode_from;
+	unsigned int l = strlen(network_inst->str);
+	if (l)
+		memcpy(msgb_put(tlv->dst, l), network_inst->str, l);
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_network_inst(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_network_inst *network_inst = encode_from;
+	return osmo_quote_str_buf3(buf, buflen, network_inst->str,
+				   strnlen(network_inst->str, sizeof(network_inst->str)));
+}
+
+int osmo_pfcp_dec_outer_header_creation(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	struct osmo_pfcp_ie_outer_header_creation *ohc = decode_to;
+	const uint8_t *pos;
+	bool gtp_u_udp_ipv4;
+	bool gtp_u_udp_ipv6;
+	bool udp_ipv4;
+	bool udp_ipv6;
+	bool ipv4;
+	bool ipv6;
+	bool c_tag;
+	bool s_tag;
+
+	*ohc = (struct osmo_pfcp_ie_outer_header_creation){};
+
+	ENSURE_LENGTH_IS_AT_LEAST(2);
+
+	memcpy(ohc->desc_bits, tlv->val, 2);
+
+	gtp_u_udp_ipv4 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_GTP_U_UDP_IPV4);
+	udp_ipv4 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_UDP_IPV4);
+	ipv4 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_IPV4);
+	gtp_u_udp_ipv6 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_GTP_U_UDP_IPV6);
+	udp_ipv6 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_UDP_IPV6);
+	ipv6 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_IPV6);
+	c_tag = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_C_TAG);
+	s_tag = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_S_TAG);
+
+	pos = tlv->val + 2;
+	if (gtp_u_udp_ipv4 || gtp_u_udp_ipv6) {
+		ENSURE_REMAINING_LENGTH_IS_AT_LEAST("TEID", pos, 4);
+		ohc->teid_present = true;
+		ohc->teid = osmo_load32be(pos);
+		pos += 4;
+	}
+	if (gtp_u_udp_ipv4 || udp_ipv4 || ipv4) {
+		ENSURE_REMAINING_LENGTH_IS_AT_LEAST("IPv4 address", pos, 4);
+		ohc->ip_addr.v4_present = true;
+		osmo_sockaddr_from_octets(&ohc->ip_addr.v4, pos, 4);
+		pos += 4;
+	}
+	if (gtp_u_udp_ipv6 || udp_ipv6 || ipv6) {
+		ENSURE_REMAINING_LENGTH_IS_AT_LEAST("IPv6 address", pos, 16);
+		ohc->ip_addr.v6_present = true;
+		osmo_sockaddr_from_octets(&ohc->ip_addr.v6, pos, 16);
+		pos += 16;
+	}
+	if (udp_ipv4 || udp_ipv6) {
+		ENSURE_REMAINING_LENGTH_IS_AT_LEAST("UDP port number", pos, 2);
+		ohc->port_number_present = true;
+		ohc->port_number = osmo_load16be(pos);
+		pos += 2;
+	}
+	if (c_tag) {
+		ohc->c_tag_present = true;
+		ENSURE_REMAINING_LENGTH_IS_AT_LEAST("C-TAG", pos, 3);
+		ohc->c_tag_present = true;
+		ohc->c_tag = osmo_load32be_ext_2(pos, 3);
+		pos += 3;
+	}
+	if (s_tag) {
+		ohc->s_tag_present = true;
+		ENSURE_REMAINING_LENGTH_IS_AT_LEAST("S-TAG", pos, 3);
+		ohc->s_tag_present = true;
+		ohc->s_tag = osmo_load32be_ext_2(pos, 3);
+		pos += 3;
+	}
+
+	return 0;
+}
+
+int osmo_pfcp_enc_outer_header_creation(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_outer_header_creation *ohc = encode_from;
+	bool gtp_u_udp_ipv4;
+	bool gtp_u_udp_ipv6;
+	bool udp_ipv4;
+	bool udp_ipv6;
+	bool ipv4;
+	bool ipv6;
+	bool c_tag;
+	bool s_tag;
+
+	memcpy(msgb_put(tlv->dst, sizeof(ohc->desc_bits)), ohc->desc_bits, sizeof(ohc->desc_bits));
+
+	gtp_u_udp_ipv4 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_GTP_U_UDP_IPV4);
+	udp_ipv4 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_UDP_IPV4);
+	ipv4 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_IPV4);
+	gtp_u_udp_ipv6 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_GTP_U_UDP_IPV6);
+	udp_ipv6 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_UDP_IPV6);
+	ipv6 = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_IPV6);
+	c_tag = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_C_TAG);
+	s_tag = osmo_pfcp_bits_get(ohc->desc_bits, OSMO_PFCP_OUTER_HEADER_CREATION_S_TAG);
+
+	if ((gtp_u_udp_ipv4 || gtp_u_udp_ipv6) != (ohc->teid_present))
+		RETURN_ERROR(-EINVAL, "teid_present = %s does not match the description bits 0x%02x\n",
+			     ohc->teid_present ? "true" : "false",
+			     ohc->desc_bits[0]);
+	if (ohc->teid_present)
+		msgb_put_u32(tlv->dst, ohc->teid);
+
+	if ((gtp_u_udp_ipv4 || udp_ipv4 || ipv4) != ohc->ip_addr.v4_present)
+		RETURN_ERROR(-EINVAL, "ipv4_addr_present = %s does not match the description bits 0x%02x\n",
+			     ohc->ip_addr.v4_present ? "true" : "false",
+			     ohc->desc_bits[0]);
+	if (ohc->ip_addr.v4_present)
+		osmo_sockaddr_to_octets(msgb_put(tlv->dst, 4), 4, &ohc->ip_addr.v4);
+
+	if ((gtp_u_udp_ipv6 || udp_ipv6 || ipv6) != ohc->ip_addr.v6_present)
+		RETURN_ERROR(-EINVAL, "ipv6_addr_present = %s does not match the description bits 0x%02x\n",
+			     ohc->ip_addr.v6_present ? "true" : "false",
+			     ohc->desc_bits[0]);
+	if (ohc->ip_addr.v6_present)
+		osmo_sockaddr_to_octets(msgb_put(tlv->dst, 16), 16, &ohc->ip_addr.v6);
+
+	if ((udp_ipv4 || udp_ipv6) != ohc->port_number_present)
+		RETURN_ERROR(-EINVAL, "port_number_present = %s does not match the description bits 0x%02x\n",
+			     ohc->port_number_present ? "true" : "false",
+			     ohc->desc_bits[0]);
+	if (ohc->port_number_present)
+		msgb_put_u16(tlv->dst, ohc->port_number);
+
+	if (c_tag != ohc->c_tag_present)
+		RETURN_ERROR(-EINVAL, "c_tag_present = %s does not match the description bits 0x%02x%02x\n",
+			     ohc->c_tag_present ? "true" : "false",
+			     ohc->desc_bits[1], ohc->desc_bits[0]);
+	if (ohc->c_tag_present)
+		osmo_store32be_ext(ohc->c_tag, msgb_put(tlv->dst, 3), 3);
+
+	if (s_tag != ohc->s_tag_present)
+		RETURN_ERROR(-EINVAL, "s_tag_present = %s does not match the description bits 0x%02x%02x\n",
+			     ohc->s_tag_present ? "true" : "false",
+			     ohc->desc_bits[1], ohc->desc_bits[0]);
+	if (ohc->s_tag_present)
+		osmo_store32be_ext(ohc->s_tag, msgb_put(tlv->dst, 3), 3);
+
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_outer_header_creation(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_outer_header_creation *ohc = encode_from;
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+	OSMO_STRBUF_APPEND(sb, osmo_pfcp_bits_to_str_buf, ohc->desc_bits, osmo_pfcp_outer_header_creation_strs);
+	if (ohc->teid_present)
+		OSMO_STRBUF_PRINTF(sb, ",TEID:0x%x", ohc->teid);
+	OSMO_STRBUF_APPEND(sb, ip_addrs_to_str_buf, &ohc->ip_addr);
+	if (ohc->port_number_present)
+		OSMO_STRBUF_PRINTF(sb, ",port:%u", ohc->port_number);
+	if (ohc->c_tag_present)
+		OSMO_STRBUF_PRINTF(sb, ",c-tag:%u", ohc->c_tag);
+	if (ohc->s_tag_present)
+		OSMO_STRBUF_PRINTF(sb, ",s-tag:%u", ohc->s_tag);
+	return sb.chars_needed;
+}
+
+int osmo_pfcp_dec_activate_predefined_rules(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	struct osmo_pfcp_ie_activate_predefined_rules *activate_predefined_rules = decode_to;
+	osmo_strlcpy(activate_predefined_rules->str, (const char *)tlv->val, OSMO_MIN(sizeof(activate_predefined_rules->str), tlv->len+1));
+	return 0;
+}
+
+int osmo_pfcp_enc_activate_predefined_rules(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_activate_predefined_rules *activate_predefined_rules = encode_from;
+	unsigned int l = strlen(activate_predefined_rules->str);
+	if (l)
+		memcpy(msgb_put(tlv->dst, l), activate_predefined_rules->str, l);
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_activate_predefined_rules(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_activate_predefined_rules *activate_predefined_rules = encode_from;
+	return osmo_quote_str_buf3(buf, buflen, activate_predefined_rules->str,
+				   strnlen(activate_predefined_rules->str, sizeof(activate_predefined_rules->str)));
+}
+
+int osmo_pfcp_dec_outer_header_removal(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	struct osmo_pfcp_ie_outer_header_removal *outer_header_removal = decode_to;
+	ENSURE_LENGTH_IS_AT_LEAST(1);
+	outer_header_removal->desc = tlv->val[0];
+
+	if (tlv->len > 1) {
+		outer_header_removal->gtp_u_extension_header_del_present = true;
+		memcpy(outer_header_removal->gtp_u_extension_header_del_bits, &tlv->val[1],
+		       sizeof(outer_header_removal->gtp_u_extension_header_del_bits));
+	}
+	return 0;
+}
+
+int osmo_pfcp_enc_outer_header_removal(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_outer_header_removal *outer_header_removal = encode_from;
+	msgb_put_u8(tlv->dst, outer_header_removal->desc);
+	if (outer_header_removal->gtp_u_extension_header_del_present) {
+		memcpy(msgb_put(tlv->dst, sizeof(outer_header_removal->gtp_u_extension_header_del_bits)),
+		       outer_header_removal->gtp_u_extension_header_del_bits,
+		       sizeof(outer_header_removal->gtp_u_extension_header_del_bits));
+	}
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_outer_header_removal(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_outer_header_removal *outer_header_removal = encode_from;
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+	OSMO_STRBUF_PRINTF(sb, "%s", osmo_pfcp_outer_header_removal_desc_str(outer_header_removal->desc));
+	if (outer_header_removal->gtp_u_extension_header_del_present)
+		OSMO_STRBUF_PRINTF(sb, ",ext-hdr-del:0x%x", outer_header_removal->gtp_u_extension_header_del_bits[0]);
+	return sb.chars_needed;
+}
+
+int osmo_pfcp_dec_ue_ip_address(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *tlv)
+{
+	struct osmo_pfcp_ie_ue_ip_address *ue_ip_address = decode_to;
+	const uint8_t *pos;
+	uint8_t flags;
+
+	pos = tlv->val;
+
+	ENSURE_REMAINING_LENGTH_IS_AT_LEAST("flags", pos, 1);
+	flags = *pos;
+	pos++;
+
+	ue_ip_address->ipv6_prefix_length_present = flags & (1 << 6);
+	ue_ip_address->chv6 = flags & (1 << 5);
+	ue_ip_address->chv4 = flags & (1 << 4);
+	ue_ip_address->ipv6_prefix_delegation_bits_present = flags & (1 << 3);
+	ue_ip_address->ip_is_destination = flags & (1 << 2);
+	ue_ip_address->ip_addr.v4_present = flags & (1 << 1);
+	ue_ip_address->ip_addr.v6_present = flags & (1 << 0);
+
+	if (ue_ip_address->ip_addr.v4_present) {
+		ENSURE_REMAINING_LENGTH_IS_AT_LEAST("IPv4 address", pos, 4);
+		osmo_sockaddr_from_octets(&ue_ip_address->ip_addr.v4, pos, 4);
+		pos += 4;
+	}
+	if (ue_ip_address->ip_addr.v6_present) {
+		ENSURE_REMAINING_LENGTH_IS_AT_LEAST("IPv6 address", pos, 16);
+		osmo_sockaddr_from_octets(&ue_ip_address->ip_addr.v6, pos, 16);
+		pos += 16;
+	}
+
+	if (ue_ip_address->ipv6_prefix_delegation_bits_present) {
+		ENSURE_REMAINING_LENGTH_IS_AT_LEAST("IPv6 prefix delegation bits", pos, 1);
+		ue_ip_address->ipv6_prefix_delegation_bits = *pos;
+		pos++;
+	}
+	if (ue_ip_address->ipv6_prefix_length_present) {
+		ENSURE_REMAINING_LENGTH_IS_AT_LEAST("IPv6 prefix length", pos, 1);
+		ue_ip_address->ipv6_prefix_length = *pos;
+		pos++;
+	}
+
+	return 0;
+}
+
+int osmo_pfcp_enc_ue_ip_address(struct osmo_gtlv_put *tlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_ue_ip_address *ue_ip_address = encode_from;
+	unsigned int l;
+	uint8_t flags;
+
+	flags = 0
+		| (ue_ip_address->ipv6_prefix_length_present ? (1 << 6) : 0)
+		| (ue_ip_address->chv6 ? (1 << 5) : 0)
+		| (ue_ip_address->chv4 ? (1 << 4) : 0)
+		| (ue_ip_address->ipv6_prefix_delegation_bits_present ? (1 << 3) : 0)
+		| (ue_ip_address->ip_is_destination ? (1 << 2) : 0)
+		| (ue_ip_address->ip_addr.v4_present ? (1 << 1) : 0)
+		| (ue_ip_address->ip_addr.v6_present ? (1 << 0) : 0)
+		;
+
+	msgb_put_u8(tlv->dst, flags);
+
+	if (ue_ip_address->ip_addr.v4_present) {
+		if (ue_ip_address->ip_addr.v4.u.sin.sin_family != AF_INET)
+			RETURN_ERROR(-EINVAL,
+				     "ue_ip_address IE indicates IPv4 address, but there is no ipv4_addr");
+		l = sizeof(ue_ip_address->ip_addr.v4.u.sin.sin_addr);
+		osmo_sockaddr_to_octets(msgb_put(tlv->dst, l), l, &ue_ip_address->ip_addr.v4);
+	}
+	if (ue_ip_address->ip_addr.v6_present) {
+		if (ue_ip_address->ip_addr.v6.u.sin6.sin6_family != AF_INET6)
+			RETURN_ERROR(-EINVAL,
+				     "ue_ip_address IE indicates IPv6 address, but there is no ipv6_addr");
+		l = sizeof(ue_ip_address->ip_addr.v6.u.sin6.sin6_addr);
+		osmo_sockaddr_to_octets(msgb_put(tlv->dst, l), l, &ue_ip_address->ip_addr.v6);
+	}
+
+	if (ue_ip_address->ipv6_prefix_delegation_bits_present)
+		msgb_put_u8(tlv->dst, ue_ip_address->ipv6_prefix_delegation_bits);
+
+	if (ue_ip_address->ipv6_prefix_length_present)
+		msgb_put_u8(tlv->dst, ue_ip_address->ipv6_prefix_length);
+
+	return 0;
+}
+
+int osmo_pfcp_enc_to_str_ue_ip_address(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct osmo_pfcp_ie_ue_ip_address *uia = encode_from;
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+	if (uia->chv4)
+		OSMO_STRBUF_PRINTF(sb, "chv4");
+	if (uia->chv6)
+		OSMO_STRBUF_PRINTF(sb, "%schv4", sb.pos ? "," : "");
+	if (uia->ip_is_destination)
+		OSMO_STRBUF_PRINTF(sb, "%sdst", sb.pos ? "," : "");
+	OSMO_STRBUF_APPEND(sb, ip_addrs_to_str_buf, &uia->ip_addr);
+	if (uia->ipv6_prefix_delegation_bits_present)
+		OSMO_STRBUF_PRINTF(sb, ",ipv6-prefix-deleg:%x", uia->ipv6_prefix_delegation_bits);
+	if (uia->ipv6_prefix_length_present)
+		OSMO_STRBUF_PRINTF(sb, ",ipv6-prefix-len:%u", uia->ipv6_prefix_length);
+	return sb.chars_needed;
+}

src/libosmo-pfcp/pfcp_msg.c

@@ -0,0 +1,553 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <errno.h>
+#include <string.h>
+
+#include <osmocom/core/endian.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/fsm.h>
+#include <osmocom/core/use_count.h>
+#include <osmocom/core/bitvec.h>
+
+#include <osmocom/pfcp/pfcp_msg.h>
+#include <osmocom/gtlv/gtlv_dec_enc.h>
+
+/* Assumes presence of local variable osmo_pfcp_msg *m. m->log_ctx may be NULL. */
+#define RETURN_ERROR(RC, FMT, ARGS...) \
+	do {\
+		OSMO_ASSERT(m); \
+		OSMO_LOG_PFCP_MSG(m, LOGL_ERROR, FMT " (%d: %s)\n", ##ARGS, RC, strerror((RC) > 0? (RC) : -(RC))); \
+		return RC; \
+	} while (0)
+
+bool osmo_pfcp_msgtype_is_response(enum osmo_pfcp_message_type message_type)
+{
+	switch (message_type) {
+	case OSMO_PFCP_MSGT_HEARTBEAT_RESP:
+	case OSMO_PFCP_MSGT_PFD_MGMT_RESP:
+	case OSMO_PFCP_MSGT_ASSOC_SETUP_RESP:
+	case OSMO_PFCP_MSGT_ASSOC_UPDATE_RESP:
+	case OSMO_PFCP_MSGT_ASSOC_RELEASE_RESP:
+	case OSMO_PFCP_MSGT_VERSION_NOT_SUPP_RESP:
+	case OSMO_PFCP_MSGT_NODE_REPORT_RESP:
+	case OSMO_PFCP_MSGT_SESSION_SET_DEL_RESP:
+	case OSMO_PFCP_MSGT_SESSION_EST_RESP:
+	case OSMO_PFCP_MSGT_SESSION_MOD_RESP:
+	case OSMO_PFCP_MSGT_SESSION_DEL_RESP:
+	case OSMO_PFCP_MSGT_SESSION_REP_RESP:
+		return true;
+	default:
+		return false;
+	}
+}
+
+struct osmo_pfcp_header_common {
+	uint8_t seid_present:1,
+		message_priority_present:1,
+		follow_on:1,
+		spare:2,
+		version:3;
+	uint8_t message_type;
+	uint16_t message_length;
+} __attribute__ ((packed));
+
+struct osmo_pfcp_header_no_seid {
+	struct osmo_pfcp_header_common c;
+	uint8_t sequence_nr[3];
+	uint8_t spare;
+} __attribute__ ((packed));
+
+struct osmo_pfcp_header_seid {
+	struct osmo_pfcp_header_common c;
+	uint64_t session_endpoint_identifier;
+	uint8_t sequence_nr[3];
+	uint8_t message_priority:4,
+		spare:4;
+} __attribute__ ((packed));
+
+int osmo_pfcp_ie_node_id_from_osmo_sockaddr(struct osmo_pfcp_ie_node_id *node_id, const struct osmo_sockaddr *os)
+{
+	switch (os->u.sa.sa_family) {
+	case AF_INET:
+		node_id->type = OSMO_PFCP_NODE_ID_T_IPV4;
+		break;
+	case AF_INET6:
+		node_id->type = OSMO_PFCP_NODE_ID_T_IPV6;
+		break;
+	default:
+		return -ENOTSUP;
+	}
+	node_id->ip = *os;
+	return 0;
+}
+
+int osmo_pfcp_ie_node_id_to_osmo_sockaddr(const struct osmo_pfcp_ie_node_id *node_id, struct osmo_sockaddr *os)
+{
+	switch (node_id->type) {
+	case OSMO_PFCP_NODE_ID_T_IPV4:
+		if (os->u.sa.sa_family != AF_INET)
+			return -EINVAL;
+		break;
+	case OSMO_PFCP_NODE_ID_T_IPV6:
+		if (os->u.sa.sa_family != AF_INET6)
+			return -EINVAL;
+		break;
+	default:
+		return -ENOTSUP;
+	}
+	*os = node_id->ip;
+	return 0;
+}
+
+static int pfcp_header_set_message_length(struct osmo_pfcp_header_common *c, unsigned int header_and_payload_len)
+{
+	if (header_and_payload_len < sizeof(struct osmo_pfcp_header_common))
+		return -EINVAL;
+	if (header_and_payload_len - sizeof(struct osmo_pfcp_header_common) > UINT16_MAX)
+		return -EMSGSIZE;
+	osmo_store16be(header_and_payload_len - sizeof(struct osmo_pfcp_header_common),
+		       &c->message_length);
+	return 0;
+}
+
+static unsigned int pfcp_header_get_message_length(const struct osmo_pfcp_header_common *c)
+{
+	unsigned int len = osmo_load16be(&c->message_length);
+	return len + sizeof(struct osmo_pfcp_header_common);
+}
+
+/*! Encode and append the given PFCP header to a msgb.
+ * \param[out] msg message buffer to which to push the header.
+ * \param[in] to-be-encoded representation of PFCP header. */
+static int enc_pfcp_header(struct msgb *msg, const struct osmo_pfcp_msg *m)
+{
+	const struct osmo_pfcp_header_parsed *parsed = &m->h;
+	struct osmo_pfcp_header_seid *h_seid;
+	struct osmo_pfcp_header_no_seid *h_no_seid;
+	struct osmo_pfcp_header_common *c;
+	int rc;
+
+	if (!parsed->seid_present) {
+		h_no_seid = (struct osmo_pfcp_header_no_seid*)msgb_put(msg, sizeof(struct osmo_pfcp_header_no_seid));
+		c = &h_no_seid->c;
+	} else {
+		h_seid = (struct osmo_pfcp_header_seid*)msgb_put(msg, sizeof(struct osmo_pfcp_header_seid));
+		c = &h_seid->c;
+	}
+
+	*c = (struct osmo_pfcp_header_common){
+		.version = parsed->version,
+		.message_priority_present = (parsed->priority_present ? 1 : 0),
+		.seid_present = (parsed->seid_present ? 1 : 0),
+		.message_type = parsed->message_type,
+	};
+
+	/* Put a preliminary length reflecting only the header, until it is updated later in osmo_pfcp_msg_encode(). */
+	rc = pfcp_header_set_message_length(c, parsed->seid_present ? sizeof(struct osmo_pfcp_header_seid)
+								    : sizeof(struct osmo_pfcp_header_no_seid));
+	if (rc)
+		RETURN_ERROR(rc, "Problem with PFCP message length");
+
+	if (!parsed->seid_present) {
+		osmo_store32be_ext(parsed->sequence_nr, h_no_seid->sequence_nr, 3);
+		if (parsed->priority_present)
+			RETURN_ERROR(-EINVAL, "Message Priority can only be present when the SEID is also present");
+	} else {
+		osmo_store64be(parsed->seid, &h_seid->session_endpoint_identifier);
+		osmo_store32be_ext(parsed->sequence_nr, h_seid->sequence_nr, 3);
+		if (parsed->priority_present)
+			h_seid->message_priority = parsed->priority;
+	}
+
+	return 0;
+}
+
+static void osmo_pfcp_msg_set_memb_ofs(struct osmo_pfcp_msg *m)
+{
+	const struct osmo_gtlv_coding *mc = osmo_pfcp_get_msg_coding(m->h.message_type);
+	m->ofs_cause = 0;
+	m->ofs_node_id = 0;
+	if (!mc)
+		return;
+	for (; !osmo_gtlv_coding_end(mc) && (m->ofs_cause == 0 || m->ofs_node_id == 0); mc++) {
+		if (mc->ti.tag == OSMO_PFCP_IEI_CAUSE)
+			m->ofs_cause = offsetof(struct osmo_pfcp_msg, ies) + mc->memb_ofs;
+		if (mc->ti.tag == OSMO_PFCP_IEI_NODE_ID)
+			m->ofs_node_id = offsetof(struct osmo_pfcp_msg, ies) + mc->memb_ofs;
+	}
+
+#if 0
+	switch (m->h.message_type) {
+	case OSMO_PFCP_MSGT_ASSOC_SETUP_REQ:
+		m->ofs_node_id = offsetof(struct osmo_pfcp_msg, ies.assoc_setup_req.node_id);
+		break;
+	case OSMO_PFCP_MSGT_ASSOC_SETUP_RESP:
+		m->ofs_cause = offsetof(struct osmo_pfcp_msg, ies.assoc_setup_resp.cause);
+		m->ofs_node_id = offsetof(struct osmo_pfcp_msg, ies.assoc_setup_resp.node_id);
+		break;
+	case OSMO_PFCP_MSGT_SESSION_EST_REQ:
+		m->ofs_node_id = offsetof(struct osmo_pfcp_msg, ies.session_est_req.node_id);
+		break;
+	case OSMO_PFCP_MSGT_SESSION_EST_RESP:
+		m->ofs_cause = offsetof(struct osmo_pfcp_msg, ies.session_est_resp.cause);
+		m->ofs_node_id = offsetof(struct osmo_pfcp_msg, ies.session_est_resp.node_id);
+		break;
+	default:
+		m->ofs_cause = 0;
+		m->ofs_node_id = 0;
+		break;
+	}
+#endif
+};
+
+/*! Decode a single PFCP message's header.
+ *
+ * If msg->l4h is non-NULL, decode at msgb_l4(msg). If l4h is NULL, decode at msgb_l3(msg).
+ * In case of bundled PFCP messages, decode only one message and return the offset to the next message in the buffer.
+ * Hence, to decode a message bundle, increment msg->l4h until all messages are decoded:
+ *
+ *   msg->l4h = msg->l3h;
+ *   while (msgb_l4len(msg)) {
+ *           struct osmo_pfcp_msg m;
+ *           struct osmo_gtlv_load tlv;
+ *           int rc;
+ *           rc = osmo_pfcp_msg_decode_header(&tlv, &m, msg);
+ *           if (rc < 0)
+ *                  error();
+ *           msg->l4h += rc;
+ *
+ *           if (osmo_pfcp_msg_decode_tlv(&m, &tlv))
+ *                  error();
+ *           handle(&m);
+ *   }
+ *
+ * \param[out] tlv  Return TLV start pointer and length in tlv->src.*.
+ * \param[inout] m  Place the decoded data in m->h; use m->ctx.* as logging context.
+ * \param[in] msg  PFCP data to parse, possibly containing a PFCP message bundle.
+ * \return total single PFCP message length (<= data_len) on success, negative on error.
+ */
+int osmo_pfcp_msg_decode_header(struct osmo_gtlv_load *tlv, struct osmo_pfcp_msg *m,
+				const struct msgb *msg)
+{
+	struct osmo_pfcp_header_parsed *parsed = &m->h;
+	const uint8_t *pfcp_msg_data;
+	unsigned int pfcp_msg_data_len;
+	unsigned int header_len;
+	unsigned int message_length;
+	const struct osmo_pfcp_header_common *c;
+
+	if (msg->l4h) {
+		pfcp_msg_data = msgb_l4(msg);
+		pfcp_msg_data_len = msgb_l4len(msg);
+	} else {
+		pfcp_msg_data = msgb_l3(msg);
+		pfcp_msg_data_len = msgb_l3len(msg);
+	}
+
+	if (!pfcp_msg_data || !pfcp_msg_data_len)
+		RETURN_ERROR(-EINVAL, "No Layer 3 data in this message buffer");
+
+	if (pfcp_msg_data_len < sizeof(struct osmo_pfcp_header_common))
+		RETURN_ERROR(-EINVAL, "Message too short for PFCP header: %u", pfcp_msg_data_len);
+
+	c = (void*)pfcp_msg_data;
+
+	header_len = (c->seid_present ? sizeof(struct osmo_pfcp_header_seid) : sizeof(struct osmo_pfcp_header_no_seid));
+	if (pfcp_msg_data_len < header_len)
+		RETURN_ERROR(-EINVAL, "Message too short for PFCP header: %u", pfcp_msg_data_len);
+
+	*parsed = (struct osmo_pfcp_header_parsed){
+		.version = c->version,
+		.priority_present = (bool)c->message_priority_present,
+		.seid_present = (bool)c->seid_present,
+		.message_type = c->message_type,
+	};
+
+	m->is_response = osmo_pfcp_msgtype_is_response(parsed->message_type);
+	osmo_pfcp_msg_set_memb_ofs(m);
+
+	message_length = pfcp_header_get_message_length(c);
+	if (message_length > pfcp_msg_data_len)
+		RETURN_ERROR(-EMSGSIZE,
+			     "The header's indicated total message length %u is larger than the received data %u",
+			     message_length, pfcp_msg_data_len);
+
+	/* T16L16V payload data and len */
+	*tlv = (struct osmo_gtlv_load){
+		.cfg = &osmo_t16l16v_cfg,
+		.src = {
+			.data = pfcp_msg_data + header_len,
+			.len = message_length - header_len,
+		},
+	};
+
+	if (c->follow_on) {
+		/* Another PFCP message should follow */
+		if (pfcp_msg_data_len - message_length < sizeof(struct osmo_pfcp_header_common))
+			OSMO_LOG_PFCP_MSG(m, LOGL_INFO,
+					  "PFCP message indicates more messages should follow in the bundle,"
+					  " but remaining size %u is too short", pfcp_msg_data_len - message_length);
+	} else {
+		/* No more PFCP message should follow in the bundle */
+		if (pfcp_msg_data_len > message_length)
+			OSMO_LOG_PFCP_MSG(m, LOGL_INFO, "Surplus data after PFCP message: %u",
+					  pfcp_msg_data_len - message_length);
+	}
+
+	if (!parsed->seid_present) {
+		const struct osmo_pfcp_header_no_seid *h_no_seid = (void*)pfcp_msg_data;
+		parsed->sequence_nr = osmo_load32be_ext_2(h_no_seid->sequence_nr, 3);
+		if (parsed->priority_present)
+			RETURN_ERROR(-EINVAL, "Message Priority can only be present when the SEID is also present");
+	} else {
+		const struct osmo_pfcp_header_seid *h_seid = (void*)pfcp_msg_data;
+		parsed->seid = osmo_load64be(&h_seid->session_endpoint_identifier);
+		parsed->sequence_nr = osmo_load32be_ext_2(h_seid->sequence_nr, 3);
+		if (parsed->priority_present)
+			parsed->priority = h_seid->message_priority;
+	}
+
+	return message_length;
+}
+
+void osmo_pfcp_msg_err_cb(void *data, void *decoded_struct, const char *file, int line, const char *fmt, ...)
+{
+	va_list ap;
+	if (log_check_level(DLPFCP, LOGL_ERROR)) {
+		char *errmsg;
+
+		va_start(ap, fmt);
+		errmsg = talloc_vasprintf(OTC_SELECT, fmt, ap);
+		va_end(ap);
+		OSMO_LOG_PFCP_MSG_SRC((struct osmo_pfcp_msg *)data, LOGL_ERROR, file, line, "%s", errmsg);
+	}
+}
+
+int osmo_pfcp_msg_decode_tlv(struct osmo_pfcp_msg *m, struct osmo_gtlv_load *tlv)
+{
+	return osmo_pfcp_ies_decode(&m->ies, tlv, false, m->h.message_type, osmo_pfcp_msg_err_cb, m, osmo_pfcp_iei_strs);
+}
+
+static int osmo_pfcp_msg_encode_tlv(struct msgb *msg, const struct osmo_pfcp_msg *m)
+{
+	struct osmo_gtlv_put tlv = {
+		.cfg = &osmo_t16l16v_cfg,
+		.dst = msg,
+	};
+	return osmo_pfcp_ies_encode(&tlv, &m->ies, m->h.message_type, osmo_pfcp_msg_err_cb, (void*)m, osmo_pfcp_iei_strs);
+}
+
+/* Append the encoded PFCP message to the message buffer.
+ *
+ * If msg->l3h is NULL, point it at the start of the encoded message.
+ * Always point msg->l4h at the start of the newly encoded message.
+ * Hence, in a message bundle, msg->l3h always points at the first PFCP message, while msg->l4h always points at the
+ * last PFCP message.
+ *
+ * When adding a PFCP message to a bundle, set the Follow On (FO) flag of the previously last message to 1, and of the
+ * newly encoded, now last message as 0.
+ *
+ * To log errors to a specific osmo_fsm_inst, point m->log_ctx to that instance before calling this function. Otherwise
+ * set log_ctx = NULL.
+ *
+ * \return 0 on success, negative on error. */
+int osmo_pfcp_msg_encode(struct msgb *msg, const struct osmo_pfcp_msg *m)
+{
+	struct osmo_pfcp_header_common *c;
+	int rc;
+
+	/* Forming a bundle? If yes, set the Follow On flag of the currently last message to 1 */
+	if (msg->l4h && msgb_l4len(msg)) {
+		c = msgb_l4(msg);
+		c->follow_on = 1;
+	}
+	/* Make sure l3h points at the first PFCP message in a message bundle */
+	if (!msg->l3h)
+		msg->l3h = msg->tail;
+	/* Make sure l4h points at the last PFCP message in a message bundle */
+	msg->l4h = msg->tail;
+	c = (void*)msg->tail;
+
+	rc = enc_pfcp_header(msg, m);
+	if (rc)
+		return rc;
+
+	rc = osmo_pfcp_msg_encode_tlv(msg, m);
+	if (rc)
+		return rc;
+
+	/* Update the header's message_length */
+	rc = pfcp_header_set_message_length(c, msgb_l4len(msg));
+	if (rc)
+		RETURN_ERROR(rc, "Problem with PFCP message length");
+	return 0;
+}
+
+static int osmo_pfcp_msg_destructor(struct osmo_pfcp_msg *m);
+
+static struct osmo_pfcp_msg *_osmo_pfcp_msg_alloc(void *ctx, const struct osmo_sockaddr *remote_addr)
+{
+	struct osmo_pfcp_msg *m = talloc(ctx, struct osmo_pfcp_msg);
+	*m = (struct osmo_pfcp_msg){
+		.remote_addr = *remote_addr,
+		.h = {
+			.version = 1,
+		},
+	};
+	talloc_set_destructor(m, osmo_pfcp_msg_destructor);
+	return m;
+}
+
+struct osmo_pfcp_msg *osmo_pfcp_msg_alloc_rx(void *ctx, const struct osmo_sockaddr *remote_addr)
+{
+	struct osmo_pfcp_msg *rx = _osmo_pfcp_msg_alloc(ctx, remote_addr);
+	rx->rx = true;
+	return rx;
+}
+
+struct osmo_pfcp_msg *osmo_pfcp_msg_alloc_tx(void *ctx, const struct osmo_sockaddr *remote_addr,
+					     const struct osmo_pfcp_ie_node_id *node_id,
+					     const struct osmo_pfcp_msg *in_reply_to,
+					     enum osmo_pfcp_message_type msg_type)
+{
+	struct osmo_pfcp_msg *tx;
+	if (!remote_addr && in_reply_to)
+		remote_addr = &in_reply_to->remote_addr;
+	OSMO_ASSERT(remote_addr);
+	tx = _osmo_pfcp_msg_alloc(ctx, remote_addr);
+	tx->is_response = osmo_pfcp_msgtype_is_response(msg_type);
+	tx->h.message_type = msg_type;
+	if (in_reply_to)
+		tx->h.sequence_nr = in_reply_to->h.sequence_nr;
+	osmo_pfcp_msg_set_memb_ofs(tx);
+
+	/* Write the local node id data to the correct tx->ies.* member. */
+	if (node_id) {
+		struct osmo_pfcp_ie_node_id *tx_node_id = osmo_pfcp_msg_node_id(tx);
+		if (tx_node_id)
+			*tx_node_id = *node_id;
+	}
+	return tx;
+}
+
+static int osmo_pfcp_msg_destructor(struct osmo_pfcp_msg *m)
+{
+	OSMO_LOG_PFCP_MSG(m, LOGL_DEBUG, "discarding\n");
+	if (m->ctx.session_use_count)
+		osmo_use_count_get_put(m->ctx.session_use_count, m->ctx.session_use_token, -1);
+	m->ctx.session_fi = NULL;
+	m->ctx.session_use_count = NULL;
+	m->ctx.session_use_token = NULL;
+
+	if (m->ctx.peer_use_count)
+		osmo_use_count_get_put(m->ctx.peer_use_count, m->ctx.peer_use_token, -1);
+	m->ctx.peer_fi = NULL;
+	m->ctx.peer_use_count = NULL;
+	m->ctx.peer_use_token = NULL;
+	return 0;
+}
+
+void osmo_pfcp_msg_free(struct osmo_pfcp_msg *m)
+{
+	if (!m)
+		return;
+	talloc_free(m);
+}
+
+int osmo_pfcp_ie_f_seid_cmp(const struct osmo_pfcp_ie_f_seid *a, const struct osmo_pfcp_ie_f_seid *b)
+{
+	int rc;
+	if (a == b)
+		return 0;
+	if (!a)
+		return -1;
+	if (!b)
+		return 1;
+	/* It suffices if one of the IP addresses match */
+	if (a->ip_addr.v4_present && b->ip_addr.v4_present)
+		rc = osmo_sockaddr_cmp(&a->ip_addr.v4, &b->ip_addr.v4);
+	else if (a->ip_addr.v6_present && b->ip_addr.v6_present)
+		rc = osmo_sockaddr_cmp(&a->ip_addr.v6, &b->ip_addr.v6);
+	else
+		rc = (a->ip_addr.v4_present ? -1 : 1);
+	if (rc)
+		return rc;
+	if (a->seid < b->seid)
+		return -1;
+	if (a->seid > b->seid)
+		return 1;
+	return 0;
+}
+
+int osmo_pfcp_ip_addrs_set(struct osmo_pfcp_ip_addrs *dst, const struct osmo_sockaddr *addr)
+{
+	switch (addr->u.sas.ss_family) {
+	case AF_INET:
+		dst->v4_present = true;
+		dst->v4 = *addr;
+		return 0;
+	case AF_INET6:
+		dst->v6_present = true;
+		dst->v6 = *addr;
+		return 0;
+	default:
+		return -ENOTSUP;
+	}
+}
+
+#if 0
+void osmo_pfcp_msg_invalidate_ctx(struct osmo_pfcp_msg *m, struct osmo_fsm_inst *deleted_fi)
+{
+	if (m->ctx.session_fi == deleted_fi) {
+		m->ctx.session_fi = NULL;
+		m->ctx.session_use_count = NULL;
+		m->ctx.session_use_token = NULL;
+	}
+	if (m->ctx.peer_fi == deleted_fi) {
+		m->ctx.peer_fi = NULL;
+		m->ctx.peer_use_count = NULL;
+		m->ctx.peer_use_token = NULL;
+	}
+}
+#endif
+
+int osmo_pfcp_msg_to_str_buf(char *buf, size_t buflen, const struct osmo_pfcp_msg *m)
+{
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+	OSMO_STRBUF_PRINTF(sb, "PFCPv%u %s hdr={seq=%u", m->h.version, osmo_pfcp_message_type_str(m->h.message_type),
+			   m->h.sequence_nr);
+	if (m->h.priority_present)
+		OSMO_STRBUF_PRINTF(sb, " prio=%u", m->h.priority);
+	if (m->h.seid_present)
+		OSMO_STRBUF_PRINTF(sb, " SEID=0x%"PRIx64, m->h.seid);
+	OSMO_STRBUF_PRINTF(sb, "} ies={");
+	OSMO_STRBUF_APPEND(sb, osmo_pfcp_ies_encode_to_str, &m->ies, m->h.message_type, osmo_pfcp_iei_strs);
+	OSMO_STRBUF_PRINTF(sb, " }");
+	return sb.chars_needed;
+}
+
+char *osmo_pfcp_msg_to_str_c(void *ctx, const struct osmo_pfcp_msg *m)
+{
+	OSMO_NAME_C_IMPL(ctx, 256, "ERROR", osmo_pfcp_msg_to_str_buf, m)
+}

src/libosmo-pfcp/pfcp_strs.c

@@ -0,0 +1,492 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <osmocom/pfcp/pfcp_strs.h>
+
+const struct value_string osmo_pfcp_message_type_strs[] = {
+	{ OSMO_PFCP_MSGT_HEARTBEAT_REQ, "HEARTBEAT_REQ" },
+	{ OSMO_PFCP_MSGT_HEARTBEAT_RESP, "HEARTBEAT_RESP" },
+	{ OSMO_PFCP_MSGT_PFD_MGMT_REQ, "PFD_MGMT_REQ" },
+	{ OSMO_PFCP_MSGT_PFD_MGMT_RESP, "PFD_MGMT_RESP" },
+	{ OSMO_PFCP_MSGT_ASSOC_SETUP_REQ, "ASSOC_SETUP_REQ" },
+	{ OSMO_PFCP_MSGT_ASSOC_SETUP_RESP, "ASSOC_SETUP_RESP" },
+	{ OSMO_PFCP_MSGT_ASSOC_UPDATE_REQ, "ASSOC_UPDATE_REQ" },
+	{ OSMO_PFCP_MSGT_ASSOC_UPDATE_RESP, "ASSOC_UPDATE_RESP" },
+	{ OSMO_PFCP_MSGT_ASSOC_RELEASE_REQ, "ASSOC_RELEASE_REQ" },
+	{ OSMO_PFCP_MSGT_ASSOC_RELEASE_RESP, "ASSOC_RELEASE_RESP" },
+	{ OSMO_PFCP_MSGT_VERSION_NOT_SUPP_RESP, "VERSION_NOT_SUPP_RESP" },
+	{ OSMO_PFCP_MSGT_NODE_REPORT_REQ, "NODE_REPORT_REQ" },
+	{ OSMO_PFCP_MSGT_NODE_REPORT_RESP, "NODE_REPORT_RESP" },
+	{ OSMO_PFCP_MSGT_SESSION_SET_DEL_REQ, "SESSION_SET_DEL_REQ" },
+	{ OSMO_PFCP_MSGT_SESSION_SET_DEL_RESP, "SESSION_SET_DEL_RESP" },
+	{ OSMO_PFCP_MSGT_SESSION_EST_REQ, "SESSION_EST_REQ" },
+	{ OSMO_PFCP_MSGT_SESSION_EST_RESP, "SESSION_EST_RESP" },
+	{ OSMO_PFCP_MSGT_SESSION_MOD_REQ, "SESSION_MOD_REQ" },
+	{ OSMO_PFCP_MSGT_SESSION_MOD_RESP, "SESSION_MOD_RESP" },
+	{ OSMO_PFCP_MSGT_SESSION_DEL_REQ, "SESSION_DEL_REQ" },
+	{ OSMO_PFCP_MSGT_SESSION_DEL_RESP, "SESSION_DEL_RESP" },
+	{ OSMO_PFCP_MSGT_SESSION_REP_REQ, "SESSION_REP_REQ" },
+	{ OSMO_PFCP_MSGT_SESSION_REP_RESP, "SESSION_REP_RESP" },
+	{ 0 }
+};
+
+const struct value_string osmo_pfcp_iei_strs[] = {
+	{ OSMO_PFCP_IEI_CREATE_PDR, "Create PDR" },
+	{ OSMO_PFCP_IEI_PDI, "PDI" },
+	{ OSMO_PFCP_IEI_CREATE_FAR, "Create FAR" },
+	{ OSMO_PFCP_IEI_FORW_PARAMS, "Forwarding Parameters" },
+	{ OSMO_PFCP_IEI_DUPL_PARAMS, "Duplicating Parameters" },
+	{ OSMO_PFCP_IEI_CREATE_URR, "Create URR" },
+	{ OSMO_PFCP_IEI_CREATE_QER, "Create QER" },
+	{ OSMO_PFCP_IEI_CREATED_PDR, "Created PDR" },
+	{ OSMO_PFCP_IEI_UPD_PDR, "Update PDR" },
+	{ OSMO_PFCP_IEI_UPD_FAR, "Update FAR" },
+	{ OSMO_PFCP_IEI_UPD_FORW_PARAMS, "Update Forwarding Parameters" },
+	{ OSMO_PFCP_IEI_UPD_BAR_SESS_REP_RESP, "Update BAR (PFCP Session Report Response)" },
+	{ OSMO_PFCP_IEI_UPD_URR, "Update URR" },
+	{ OSMO_PFCP_IEI_UPD_QER, "Update QER" },
+	{ OSMO_PFCP_IEI_REMOVE_PDR, "Remove PDR" },
+	{ OSMO_PFCP_IEI_REMOVE_FAR, "Remove FAR" },
+	{ OSMO_PFCP_IEI_REMOVE_URR, "Remove URR" },
+	{ OSMO_PFCP_IEI_REMOVE_QER, "Remove QER" },
+	{ OSMO_PFCP_IEI_CAUSE, "Cause" },
+	{ OSMO_PFCP_IEI_SOURCE_IFACE, "Source Interface" },
+	{ OSMO_PFCP_IEI_F_TEID, "F-TEID" },
+	{ OSMO_PFCP_IEI_NETWORK_INST, "Network Instance" },
+	{ OSMO_PFCP_IEI_SDF_FILTER, "SDF Filter" },
+	{ OSMO_PFCP_IEI_APPLICATION_ID, "Application ID" },
+	{ OSMO_PFCP_IEI_GATE_STATUS, "Gate Status" },
+	{ OSMO_PFCP_IEI_MBR, "MBR" },
+	{ OSMO_PFCP_IEI_GBR, "GBR" },
+	{ OSMO_PFCP_IEI_QER_CORRELATION_ID, "QER Correlation ID" },
+	{ OSMO_PFCP_IEI_PRECEDENCE, "Precedence" },
+	{ OSMO_PFCP_IEI_TRANSPORT_LEVEL_MARKING, "Transport Level Marking" },
+	{ OSMO_PFCP_IEI_VOLUME_THRESH, "Volume Threshold" },
+	{ OSMO_PFCP_IEI_TIME_THRESH, "Time Threshold" },
+	{ OSMO_PFCP_IEI_MONITORING_TIME, "Monitoring Time" },
+	{ OSMO_PFCP_IEI_SUBSEQUENT_VOLUME_THRESH, "Subsequent Volume Threshold" },
+	{ OSMO_PFCP_IEI_SUBSEQUENT_TIME_THRESH, "Subsequent Time Threshold" },
+	{ OSMO_PFCP_IEI_INACT_DETECTION_TIME, "Inactivity Detection Time" },
+	{ OSMO_PFCP_IEI_REPORTING_TRIGGERS, "Reporting Triggers" },
+	{ OSMO_PFCP_IEI_REDIRECT_INFO, "Redirect Information" },
+	{ OSMO_PFCP_IEI_REP_TYPE, "Report Type" },
+	{ OSMO_PFCP_IEI_OFFENDING_IE, "Offending IE" },
+	{ OSMO_PFCP_IEI_FORW_POLICY, "Forwarding Policy" },
+	{ OSMO_PFCP_IEI_DESTINATION_IFACE, "Destination Interface" },
+	{ OSMO_PFCP_IEI_UP_FUNCTION_FEATURES, "UP Function Features" },
+	{ OSMO_PFCP_IEI_APPLY_ACTION, "Apply Action" },
+	{ OSMO_PFCP_IEI_DL_DATA_SERVICE_INFO, "Downlink Data Service Information" },
+	{ OSMO_PFCP_IEI_DL_DATA_NOTIFICATION_DELAY, "Downlink Data Notification Delay" },
+	{ OSMO_PFCP_IEI_DL_BUFF_DURATION, "DL Buffering Duration" },
+	{ OSMO_PFCP_IEI_DL_BUFF_SUGGESTED_PACKET_COUNT, "DL Buffering Suggested Packet Count" },
+	{ OSMO_PFCP_IEI_PFCPSMREQ_FLAGS, "PFCPSMReq-Flags" },
+	{ OSMO_PFCP_IEI_PFCPSRRSP_FLAGS, "PFCPSRRsp-Flags" },
+	{ OSMO_PFCP_IEI_LOAD_CTRL_INFO, "Load Control Information" },
+	{ OSMO_PFCP_IEI_SEQUENCE_NUMBER, "Sequence Number" },
+	{ OSMO_PFCP_IEI_METRIC, "Metric" },
+	{ OSMO_PFCP_IEI_OVERLOAD_CTRL_INFO, "Overload Control Information" },
+	{ OSMO_PFCP_IEI_TIMER, "Timer" },
+	{ OSMO_PFCP_IEI_PDR_ID, "PDR ID" },
+	{ OSMO_PFCP_IEI_F_SEID, "F-SEID" },
+	{ OSMO_PFCP_IEI_APPLICATION_IDS_PFDS, "Application ID's PFDs" },
+	{ OSMO_PFCP_IEI_PFD_CONTEXT, "PFD context" },
+	{ OSMO_PFCP_IEI_NODE_ID, "Node ID" },
+	{ OSMO_PFCP_IEI_PFD_CONTENTS, "PFD contents" },
+	{ OSMO_PFCP_IEI_MEAS_METHOD, "Measurement Method" },
+	{ OSMO_PFCP_IEI_USAGE_REP_TRIGGER, "Usage Report Trigger" },
+	{ OSMO_PFCP_IEI_MEAS_PERIOD, "Measurement Period" },
+	{ OSMO_PFCP_IEI_FQ_CSID, "FQ-CSID" },
+	{ OSMO_PFCP_IEI_VOLUME_MEAS, "Volume Measurement" },
+	{ OSMO_PFCP_IEI_DURATION_MEAS, "Duration Measurement" },
+	{ OSMO_PFCP_IEI_APPLICATION_DETECTION_INFO, "Application Detection Information" },
+	{ OSMO_PFCP_IEI_TIME_OF_FIRST_PACKET, "Time of First Packet" },
+	{ OSMO_PFCP_IEI_TIME_OF_LAST_PACKET, "Time of Last Packet" },
+	{ OSMO_PFCP_IEI_QUOTA_HOLDING_TIME, "Quota Holding Time" },
+	{ OSMO_PFCP_IEI_DROPPED_DL_TRAFFIC_THRESH, "Dropped DL Traffic Threshold" },
+	{ OSMO_PFCP_IEI_VOLUME_QUOTA, "Volume Quota" },
+	{ OSMO_PFCP_IEI_TIME_QUOTA, "Time Quota" },
+	{ OSMO_PFCP_IEI_START_TIME, "Start Time" },
+	{ OSMO_PFCP_IEI_END_TIME, "End Time" },
+	{ OSMO_PFCP_IEI_QUERY_URR, "Query URR" },
+	{ OSMO_PFCP_IEI_USAGE_REP_SESS_MOD_RESP, "Usage Report (Session Modification Response)" },
+	{ OSMO_PFCP_IEI_USAGE_REP_SESS_DEL_RESP, "Usage Report (Session Deletion Response)" },
+	{ OSMO_PFCP_IEI_USAGE_REP_SESS_REP_REQ, "Usage Report (Session Report Request)" },
+	{ OSMO_PFCP_IEI_URR_ID, "URR ID" },
+	{ OSMO_PFCP_IEI_LINKED_URR_ID, "Linked URR ID" },
+	{ OSMO_PFCP_IEI_DL_DATA_REP, "Downlink Data Report" },
+	{ OSMO_PFCP_IEI_OUTER_HEADER_CREATION, "Outer Header Creation" },
+	{ OSMO_PFCP_IEI_CREATE_BAR, "Create BAR" },
+	{ OSMO_PFCP_IEI_UPD_BAR_SESS_MOD_REQ, "Update BAR (Session Modification Request)" },
+	{ OSMO_PFCP_IEI_REMOVE_BAR, "Remove BAR" },
+	{ OSMO_PFCP_IEI_BAR_ID, "BAR ID" },
+	{ OSMO_PFCP_IEI_CP_FUNCTION_FEATURES, "CP Function Features" },
+	{ OSMO_PFCP_IEI_USAGE_INFO, "Usage Information" },
+	{ OSMO_PFCP_IEI_APPLICATION_INST_ID, "Application Instance ID" },
+	{ OSMO_PFCP_IEI_FLOW_INFO, "Flow Information" },
+	{ OSMO_PFCP_IEI_UE_IP_ADDRESS, "UE IP Address" },
+	{ OSMO_PFCP_IEI_PACKET_RATE, "Packet Rate" },
+	{ OSMO_PFCP_IEI_OUTER_HEADER_REMOVAL, "Outer Header Removal" },
+	{ OSMO_PFCP_IEI_RECOVERY_TIME_STAMP, "Recovery Time Stamp" },
+	{ OSMO_PFCP_IEI_DL_FLOW_LEVEL_MARKING, "DL Flow Level Marking" },
+	{ OSMO_PFCP_IEI_HEADER_ENRICHMENT, "Header Enrichment" },
+	{ OSMO_PFCP_IEI_ERROR_IND_REP, "Error Indication Report" },
+	{ OSMO_PFCP_IEI_MEAS_INFO, "Measurement Information" },
+	{ OSMO_PFCP_IEI_NODE_REP_TYPE, "Node Report Type" },
+	{ OSMO_PFCP_IEI_USER_PLANE_PATH_FAILURE_REP, "User Plane Path Failure Report" },
+	{ OSMO_PFCP_IEI_REMOTE_GTP_U_PEER, "Remote GTP-U Peer" },
+	{ OSMO_PFCP_IEI_UR_SEQN, "UR-SEQN" },
+	{ OSMO_PFCP_IEI_UPD_DUPL_PARAMS, "Update Duplicating Parameters" },
+	{ OSMO_PFCP_IEI_ACTIVATE_PREDEFINED_RULES, "Activate Predefined Rules" },
+	{ OSMO_PFCP_IEI_DEACTIVATE_PREDEFINED_RULES, "Deactivate Predefined Rules" },
+	{ OSMO_PFCP_IEI_FAR_ID, "FAR ID" },
+	{ OSMO_PFCP_IEI_QER_ID, "QER ID" },
+	{ OSMO_PFCP_IEI_OCI_FLAGS, "OCI Flags" },
+	{ OSMO_PFCP_IEI_PFCP_ASSOC_RELEASE_REQ, "PFCP Association Release Request" },
+	{ OSMO_PFCP_IEI_GRACEFUL_RELEASE_PERIOD, "Graceful Release Period" },
+	{ OSMO_PFCP_IEI_PDN_TYPE, "PDN Type" },
+	{ OSMO_PFCP_IEI_FAILED_RULE_ID, "Failed Rule ID" },
+	{ OSMO_PFCP_IEI_TIME_QUOTA_MECHANISM, "Time Quota Mechanism" },
+	{ OSMO_PFCP_IEI_RESERVED, "Reserved" },
+	{ OSMO_PFCP_IEI_USER_PLANE_INACT_TIMER, "User Plane Inactivity Timer" },
+	{ OSMO_PFCP_IEI_AGGREGATED_URRS, "Aggregated URRs" },
+	{ OSMO_PFCP_IEI_MULTIPLIER, "Multiplier" },
+	{ OSMO_PFCP_IEI_AGGREGATED_URR_ID, "Aggregated URR ID" },
+	{ OSMO_PFCP_IEI_SUBSEQUENT_VOLUME_QUOTA, "Subsequent Volume Quota" },
+	{ OSMO_PFCP_IEI_SUBSEQUENT_TIME_QUOTA, "Subsequent Time Quota" },
+	{ OSMO_PFCP_IEI_RQI, "RQI" },
+	{ OSMO_PFCP_IEI_QFI, "QFI" },
+	{ OSMO_PFCP_IEI_QUERY_URR_REFERENCE, "Query URR Reference" },
+	{ OSMO_PFCP_IEI_ADDITIONAL_USAGE_REPS_INFO, "Additional Usage Reports Information" },
+	{ OSMO_PFCP_IEI_CREATE_TRAFFIC_ENDPOINT, "Create Traffic Endpoint" },
+	{ OSMO_PFCP_IEI_CREATED_TRAFFIC_ENDPOINT, "Created Traffic Endpoint" },
+	{ OSMO_PFCP_IEI_UPD_TRAFFIC_ENDPOINT, "Update Traffic Endpoint" },
+	{ OSMO_PFCP_IEI_REMOVE_TRAFFIC_ENDPOINT, "Remove Traffic Endpoint" },
+	{ OSMO_PFCP_IEI_TRAFFIC_ENDPOINT_ID, "Traffic Endpoint ID" },
+	{ OSMO_PFCP_IEI_ETHERNET_PACKET_FILTER, "Ethernet Packet Filter" },
+	{ OSMO_PFCP_IEI_MAC_ADDRESS, "MAC address" },
+	{ OSMO_PFCP_IEI_C_TAG, "C-TAG" },
+	{ OSMO_PFCP_IEI_S_TAG, "S-TAG" },
+	{ OSMO_PFCP_IEI_ETHERTYPE, "Ethertype" },
+	{ OSMO_PFCP_IEI_PROXYING, "Proxying" },
+	{ OSMO_PFCP_IEI_ETHERNET_FILTER_ID, "Ethernet Filter ID" },
+	{ OSMO_PFCP_IEI_ETHERNET_FILTER_PROPERTIES, "Ethernet Filter Properties" },
+	{ OSMO_PFCP_IEI_SUGGESTED_BUFF_PACKETS_COUNT, "Suggested Buffering Packets Count" },
+	{ OSMO_PFCP_IEI_USER_ID, "User ID" },
+	{ OSMO_PFCP_IEI_ETHERNET_PDU_SESS_INFO, "Ethernet PDU Session Information" },
+	{ OSMO_PFCP_IEI_ETHERNET_TRAFFIC_INFO, "Ethernet Traffic Information" },
+	{ OSMO_PFCP_IEI_MAC_ADDRS_DETECTED, "MAC Addresses Detected" },
+	{ OSMO_PFCP_IEI_MAC_ADDRS_REMOVED, "MAC Addresses Removed" },
+	{ OSMO_PFCP_IEI_ETHERNET_INACT_TIMER, "Ethernet Inactivity Timer" },
+	{ OSMO_PFCP_IEI_ADDITIONAL_MONITORING_TIME, "Additional Monitoring Time" },
+	{ OSMO_PFCP_IEI_EVENT_QUOTA, "Event Quota" },
+	{ OSMO_PFCP_IEI_EVENT_THRESH, "Event Threshold" },
+	{ OSMO_PFCP_IEI_SUBSEQUENT_EVENT_QUOTA, "Subsequent Event Quota" },
+	{ OSMO_PFCP_IEI_SUBSEQUENT_EVENT_THRESH, "Subsequent Event Threshold" },
+	{ OSMO_PFCP_IEI_TRACE_INFO, "Trace Information" },
+	{ OSMO_PFCP_IEI_FRAMED_ROUTE, "Framed-Route" },
+	{ OSMO_PFCP_IEI_FRAMED_ROUTING, "Framed-Routing" },
+	{ OSMO_PFCP_IEI_FRAMED_IPV6_ROUTE, "Framed-IPv6-Route" },
+	{ OSMO_PFCP_IEI_TIME_STAMP, "Time Stamp" },
+	{ OSMO_PFCP_IEI_AVERAGING_WINDOW, "Averaging Window" },
+	{ OSMO_PFCP_IEI_PAGING_POLICY_INDICATOR, "Paging Policy Indicator" },
+	{ OSMO_PFCP_IEI_APN_DNN, "APN/DNN" },
+	{ OSMO_PFCP_IEI_3GPP_IFACE_TYPE, "3GPP Interface Type" },
+	{ OSMO_PFCP_IEI_PFCPSRREQ_FLAGS, "PFCPSRReq-Flags" },
+	{ OSMO_PFCP_IEI_PFCPAUREQ_FLAGS, "PFCPAUReq-Flags" },
+	{ OSMO_PFCP_IEI_ACTIVATION_TIME, "Activation Time" },
+	{ OSMO_PFCP_IEI_DEACTIVATION_TIME, "Deactivation Time" },
+	{ OSMO_PFCP_IEI_CREATE_MAR, "Create MAR" },
+	{ OSMO_PFCP_IEI_3GPP_ACCESS_FORW_ACTION_INFO, "3GPP Access Forwarding Action Information" },
+	{ OSMO_PFCP_IEI_NON_3GPP_ACCESS_FORW_ACTION_INFO, "Non-3GPP Access Forwarding Action Information" },
+	{ OSMO_PFCP_IEI_REMOVE_MAR, "Remove MAR" },
+	{ OSMO_PFCP_IEI_UPD_MAR, "Update MAR" },
+	{ OSMO_PFCP_IEI_MAR_ID, "MAR ID" },
+	{ OSMO_PFCP_IEI_STEERING_FUNCTIONALITY, "Steering Functionality" },
+	{ OSMO_PFCP_IEI_STEERING_MODE, "Steering Mode" },
+	{ OSMO_PFCP_IEI_WEIGHT, "Weight" },
+	{ OSMO_PFCP_IEI_PRIORITY, "Priority" },
+	{ OSMO_PFCP_IEI_UPD_3GPP_ACCESS_FORW_ACTION_INFO, "Update 3GPP Access Forwarding Action Information" },
+	{ OSMO_PFCP_IEI_UPD_NON_3GPP_ACCESS_FORW_ACTION_INFO, "Update Non 3GPP Access Forwarding Action Information" },
+	{ OSMO_PFCP_IEI_UE_IP_ADDRESS_POOL_IDENTITY, "UE IP address Pool Identity" },
+	{ OSMO_PFCP_IEI_ALTERNATIVE_SMF_IP_ADDRESS, "Alternative SMF IP Address" },
+	{ OSMO_PFCP_IEI_PACKET_REPLICATION_AND_DETECTION_CARRY_ON_INFO, "Packet Replication and Detection Carry-On Information" },
+	{ OSMO_PFCP_IEI_SMF_SET_ID, "SMF Set ID" },
+	{ OSMO_PFCP_IEI_QUOTA_VALIDITY_TIME, "Quota Validity Time" },
+	{ OSMO_PFCP_IEI_NUMBER_OF_REPS, "Number of Reports" },
+	{ OSMO_PFCP_IEI_PFCP_SESS_RETENTION_INFO_IN_ASSOC_SETUP_REQ, "PFCP Session Retention Information (within PFCP Association Setup Request)" },
+	{ OSMO_PFCP_IEI_PFCPASRSP_FLAGS, "PFCPASRsp-Flags" },
+	{ OSMO_PFCP_IEI_CP_ENTITY_IP_ADDRESS, "CP PFCP Entity IP Address" },
+	{ OSMO_PFCP_IEI_PFCPSEREQ_FLAGS, "PFCPSEReq-Flags" },
+	{ OSMO_PFCP_IEI_USER_PLANE_PATH_RECOVERY_REP, "User Plane Path Recovery Report" },
+	{ OSMO_PFCP_IEI_IP_MULTICAST_ADDR_INFO_IN_SESS_EST_REQ, "IP Multicast Addressing Info within PFCP Session Establishment Request" },
+	{ OSMO_PFCP_IEI_JOIN_IP_MULTICAST_INFO_IE_IN_USAGE_REP, "Join IP Multicast Information IE within Usage Report" },
+	{ OSMO_PFCP_IEI_LEAVE_IP_MULTICAST_INFO_IE_IN_USAGE_REP, "Leave IP Multicast Information IE within Usage Report" },
+	{ OSMO_PFCP_IEI_IP_MULTICAST_ADDRESS, "IP Multicast Address" },
+	{ OSMO_PFCP_IEI_SOURCE_IP_ADDRESS, "Source IP Address" },
+	{ OSMO_PFCP_IEI_PACKET_RATE_STATUS, "Packet Rate Status" },
+	{ OSMO_PFCP_IEI_CREATE_BRIDGE_INFO_FOR_TSC, "Create Bridge Info for TSC" },
+	{ OSMO_PFCP_IEI_CREATED_BRIDGE_INFO_FOR_TSC, "Created Bridge Info for TSC" },
+	{ OSMO_PFCP_IEI_DS_TT_PORT_NUMBER, "DS-TT Port Number" },
+	{ OSMO_PFCP_IEI_NW_TT_PORT_NUMBER, "NW-TT Port Number" },
+	{ OSMO_PFCP_IEI_TSN_BRIDGE_ID, "TSN Bridge ID" },
+	{ OSMO_PFCP_IEI_TSC_MGMT_INFO_IE_IN_SESS_MOD_REQ, "TSC Management Information IE within PFCP Session Modification Request" },
+	{ OSMO_PFCP_IEI_TSC_MGMT_INFO_IE_IN_SESS_MOD_RESP, "TSC Management Information IE within PFCP Session Modification Response" },
+	{ OSMO_PFCP_IEI_TSC_MGMT_INFO_IE_IN_SESS_REP_REQ, "TSC Management Information IE within PFCP Session Report Request" },
+	{ OSMO_PFCP_IEI_PORT_MGMT_INFO_CONTAINER, "Port Management Information Container" },
+	{ OSMO_PFCP_IEI_CLOCK_DRIFT_CTRL_INFO, "Clock Drift Control Information" },
+	{ OSMO_PFCP_IEI_REQUESTED_CLOCK_DRIFT_INFO, "Requested Clock Drift Information" },
+	{ OSMO_PFCP_IEI_CLOCK_DRIFT_REP, "Clock Drift Report" },
+	{ OSMO_PFCP_IEI_TSN_TIME_DOMAIN_NUMBER, "TSN Time Domain Number" },
+	{ OSMO_PFCP_IEI_TIME_OFFSET_THRESH, "Time Offset Threshold" },
+	{ OSMO_PFCP_IEI_CUMULATIVE_RATERATIO_THRESH, "Cumulative rateRatio Threshold" },
+	{ OSMO_PFCP_IEI_TIME_OFFSET_MEAS, "Time Offset Measurement" },
+	{ OSMO_PFCP_IEI_CUMULATIVE_RATERATIO_MEAS, "Cumulative rateRatio Measurement" },
+	{ OSMO_PFCP_IEI_REMOVE_SRR, "Remove SRR" },
+	{ OSMO_PFCP_IEI_CREATE_SRR, "Create SRR" },
+	{ OSMO_PFCP_IEI_UPD_SRR, "Update SRR" },
+	{ OSMO_PFCP_IEI_SESS_REP, "Session Report" },
+	{ OSMO_PFCP_IEI_SRR_ID, "SRR ID" },
+	{ OSMO_PFCP_IEI_ACCESS_AVAIL_CTRL_INFO, "Access Availability Control Information" },
+	{ OSMO_PFCP_IEI_REQUESTED_ACCESS_AVAIL_INFO, "Requested Access Availability Information" },
+	{ OSMO_PFCP_IEI_ACCESS_AVAIL_REP, "Access Availability Report" },
+	{ OSMO_PFCP_IEI_ACCESS_AVAIL_INFO, "Access Availability Information" },
+	{ OSMO_PFCP_IEI_PROVIDE_ATSSS_CTRL_INFO, "Provide ATSSS Control Information" },
+	{ OSMO_PFCP_IEI_ATSSS_CTRL_PARAMS, "ATSSS Control Parameters" },
+	{ OSMO_PFCP_IEI_MPTCP_CTRL_INFO, "MPTCP Control Information" },
+	{ OSMO_PFCP_IEI_ATSSS_LL_CTRL_INFO, "ATSSS-LL Control Information" },
+	{ OSMO_PFCP_IEI_PMF_CTRL_INFO, "PMF Control Information" },
+	{ OSMO_PFCP_IEI_MPTCP_PARAMS, "MPTCP Parameters" },
+	{ OSMO_PFCP_IEI_ATSSS_LL_PARAMS, "ATSSS-LL Parameters" },
+	{ OSMO_PFCP_IEI_PMF_PARAMS, "PMF Parameters" },
+	{ OSMO_PFCP_IEI_MPTCP_ADDRESS_INFO, "MPTCP Address Information" },
+	{ OSMO_PFCP_IEI_UE_LINK_SPECIFIC_IP_ADDRESS, "UE Link-Specific IP Address" },
+	{ OSMO_PFCP_IEI_PMF_ADDRESS_INFO, "PMF Address Information" },
+	{ OSMO_PFCP_IEI_ATSSS_LL_INFO, "ATSSS-LL Information" },
+	{ OSMO_PFCP_IEI_DATA_NETWORK_ACCESS_IDENTIFIER, "Data Network Access Identifier" },
+	{ OSMO_PFCP_IEI_UE_IP_ADDRESS_POOL_INFO, "UE IP address Pool Information" },
+	{ OSMO_PFCP_IEI_AVERAGE_PACKET_DELAY, "Average Packet Delay" },
+	{ OSMO_PFCP_IEI_MIN_PACKET_DELAY, "Minimum Packet Delay" },
+	{ OSMO_PFCP_IEI_MAX_PACKET_DELAY, "Maximum Packet Delay" },
+	{ OSMO_PFCP_IEI_QOS_REP_TRIGGER, "QoS Report Trigger" },
+	{ OSMO_PFCP_IEI_GTP_U_PATH_QOS_CTRL_INFO, "GTP-U Path QoS Control Information" },
+	{ OSMO_PFCP_IEI_GTP_U_PATH_QOS_REP_NODE_REP_REQ, "GTP-U Path QoS Report (PFCP Node Report Request)" },
+	{ OSMO_PFCP_IEI_QOS_INFO_IN_GTP_U_PATH_QOS_REP, "QoS Information in GTP-U Path QoS Report" },
+	{ OSMO_PFCP_IEI_GTP_U_PATH_IFACE_TYPE, "GTP-U Path Interface Type" },
+	{ OSMO_PFCP_IEI_QOS_MONITORING_PER_QOS_FLOW_CTRL_INFO, "QoS Monitoring per QoS flow Control Information" },
+	{ OSMO_PFCP_IEI_REQUESTED_QOS_MONITORING, "Requested QoS Monitoring" },
+	{ OSMO_PFCP_IEI_REPORTING_FREQUENCY, "Reporting Frequency" },
+	{ OSMO_PFCP_IEI_PACKET_DELAY_THRESHOLDS, "Packet Delay Thresholds" },
+	{ OSMO_PFCP_IEI_MIN_WAIT_TIME, "Minimum Wait Time" },
+	{ OSMO_PFCP_IEI_QOS_MONITORING_REP, "QoS Monitoring Report" },
+	{ OSMO_PFCP_IEI_QOS_MONITORING_MEAS, "QoS Monitoring Measurement" },
+	{ OSMO_PFCP_IEI_MT_EDT_CTRL_INFO, "MT-EDT Control Information" },
+	{ OSMO_PFCP_IEI_DL_DATA_PACKETS_SIZE, "DL Data Packets Size" },
+	{ OSMO_PFCP_IEI_QER_CTRL_INDICATIONS, "QER Control Indications" },
+	{ OSMO_PFCP_IEI_PACKET_RATE_STATUS_REP, "Packet Rate Status Report" },
+	{ OSMO_PFCP_IEI_NF_INST_ID, "NF Instance ID" },
+	{ OSMO_PFCP_IEI_ETHERNET_CONTEXT_INFO, "Ethernet Context Information" },
+	{ OSMO_PFCP_IEI_REDUNDANT_TRANSMISSION_PARAMS, "Redundant Transmission Parameters" },
+	{ OSMO_PFCP_IEI_UPDATED_PDR, "Updated PDR" },
+	{ OSMO_PFCP_IEI_S_NSSAI, "S-NSSAI" },
+	{ OSMO_PFCP_IEI_IP_VERSION, "IP version" },
+	{ OSMO_PFCP_IEI_PFCPASREQ_FLAGS, "PFCPASReq-Flags" },
+	{ OSMO_PFCP_IEI_DATA_STATUS, "Data Status" },
+	{ OSMO_PFCP_IEI_PROVIDE_RDS_CONF_INFO, "Provide RDS configuration information" },
+	{ OSMO_PFCP_IEI_RDS_CONF_INFO, "RDS configuration information" },
+	{ OSMO_PFCP_IEI_QUERY_PACKET_RATE_STATUS_IE_IN_SESS_MOD_REQ, "Query Packet Rate Status IE within PFCP Session Modification Request" },
+	{ OSMO_PFCP_IEI_PACKET_RATE_STATUS_REP_IE_IN_SESS_MOD_RESP, "Packet Rate Status Report IE within PFCP Session Modification Response" },
+	{ OSMO_PFCP_IEI_MPTCP_APPLICABLE_IND, "MPTCP Applicable Indication" },
+	{ OSMO_PFCP_IEI_BRIDGE_MGMT_INFO_CONTAINER, "Bridge Management Information Container" },
+	{ OSMO_PFCP_IEI_UE_IP_ADDRESS_USAGE_INFO, "UE IP Address Usage Information" },
+	{ OSMO_PFCP_IEI_NUMBER_OF_UE_IP_ADDRS, "Number of UE IP Addresses" },
+	{ OSMO_PFCP_IEI_VALIDITY_TIMER, "Validity Timer" },
+	{ OSMO_PFCP_IEI_REDUNDANT_TRANSMISSION_FORW_PARAMS, "Redundant Transmission Forwarding Parameters" },
+	{ OSMO_PFCP_IEI_TRANSPORT_DELAY_REPORTING, "Transport Delay Reporting" },
+	{ 0 }
+};
+
+const struct value_string osmo_pfcp_cause_strs[] = {
+	{ OSMO_PFCP_CAUSE_RESERVED, "0" },
+	{ OSMO_PFCP_CAUSE_REQUEST_ACCEPTED, "Request accepted (success)" },
+	{ OSMO_PFCP_CAUSE_MORE_USAGE_REPORT_TO_SEND, "More Usage Report to send" },
+	{ OSMO_PFCP_CAUSE_REQUEST_REJECTED, "Request rejected (reason not specified)" },
+	{ OSMO_PFCP_CAUSE_SESSION_CTX_NOT_FOUND, "Session context not found" },
+	{ OSMO_PFCP_CAUSE_MANDATORY_IE_MISSING, "Mandatory IE missing" },
+	{ OSMO_PFCP_CAUSE_CONDITIONAL_IE_MISSING, "Conditional IE missing" },
+	{ OSMO_PFCP_CAUSE_INVALID_LENGTH, "Invalid length" },
+	{ OSMO_PFCP_CAUSE_MANDATORY_IE_INCORRECT, "Mandatory IE incorrect" },
+	{ OSMO_PFCP_CAUSE_INVALID_FORW_POLICY, "Invalid Forwarding Policy" },
+	{ OSMO_PFCP_CAUSE_INVALID_F_TEID_ALLOC_OPTION, "Invalid F-TEID allocation option" },
+	{ OSMO_PFCP_CAUSE_NO_ESTABLISHED_PFCP_ASSOC, "No established PFCP Association" },
+	{ OSMO_PFCP_CAUSE_RULE_CREATION_MOD_FAILURE, "Rule creation/modification Failure" },
+	{ OSMO_PFCP_CAUSE_PFCP_ENTITY_IN_CONGESTION, "PFCP entity in congestion" },
+	{ OSMO_PFCP_CAUSE_NO_RESOURCES_AVAILABLE, "No resources available" },
+	{ OSMO_PFCP_CAUSE_SERVICE_NOT_SUPPORTED, "Service not supported" },
+	{ OSMO_PFCP_CAUSE_SYSTEM_FAILURE, "System failure" },
+	{ OSMO_PFCP_CAUSE_REDIRECTION_REQUESTED, "Redirection Requested" },
+	{ OSMO_PFCP_CAUSE_ALL_DYNAMIC_ADDRESSES_ARE_OCCUPIED, "All dynamic addresses are occupied" },
+	{ 0 }
+};
+
+const struct value_string osmo_pfcp_up_feature_strs[] = {
+	{ OSMO_PFCP_UP_FEAT_BUCP, "BUCP" },
+	{ OSMO_PFCP_UP_FEAT_DDND, "DDND" },
+	{ OSMO_PFCP_UP_FEAT_DLBD, "DLBD" },
+	{ OSMO_PFCP_UP_FEAT_TRST, "TRST" },
+	{ OSMO_PFCP_UP_FEAT_FTUP, "FTUP" },
+	{ OSMO_PFCP_UP_FEAT_PFDM, "PFDM" },
+	{ OSMO_PFCP_UP_FEAT_HEEU, "HEEU" },
+	{ OSMO_PFCP_UP_FEAT_TREU, "TREU" },
+	{ OSMO_PFCP_UP_FEAT_EMPU, "EMPU" },
+	{ OSMO_PFCP_UP_FEAT_PDIU, "PDIU" },
+	{ OSMO_PFCP_UP_FEAT_UDBC, "UDBC" },
+	{ OSMO_PFCP_UP_FEAT_QUOAC, "QUOAC" },
+	{ OSMO_PFCP_UP_FEAT_TRACE, "TRACE" },
+	{ OSMO_PFCP_UP_FEAT_FRRT, "FRRT" },
+	{ OSMO_PFCP_UP_FEAT_PFDE, "PFDE" },
+	{ OSMO_PFCP_UP_FEAT_EPFAR, "EPFAR" },
+	{ OSMO_PFCP_UP_FEAT_DPDRA, "DPDRA" },
+	{ OSMO_PFCP_UP_FEAT_ADPDP, "ADPDP" },
+	{ OSMO_PFCP_UP_FEAT_UEIP, "UEIP" },
+	{ OSMO_PFCP_UP_FEAT_SSET, "SSET" },
+	{ OSMO_PFCP_UP_FEAT_MNOP, "MNOP" },
+	{ OSMO_PFCP_UP_FEAT_MTE, "MTE" },
+	{ OSMO_PFCP_UP_FEAT_BUNDL, "BUNDL" },
+	{ OSMO_PFCP_UP_FEAT_GCOM, "GCOM" },
+	{ OSMO_PFCP_UP_FEAT_MPAS, "MPAS" },
+	{ OSMO_PFCP_UP_FEAT_RTTL, "RTTL" },
+	{ OSMO_PFCP_UP_FEAT_VTIME, "VTIME" },
+	{ OSMO_PFCP_UP_FEAT_NORP, "NORP" },
+	{ OSMO_PFCP_UP_FEAT_IP6PL, "IP6PL" },
+	{ OSMO_PFCP_UP_FEAT_TSCU, "TSCU" },
+	{ OSMO_PFCP_UP_FEAT_MPTCP, "MPTCP" },
+	{ OSMO_PFCP_UP_FEAT_ATSSSLL, "ATSSSLL" },
+	{ OSMO_PFCP_UP_FEAT_QFQM, "QFQM" },
+	{ OSMO_PFCP_UP_FEAT_GPQM, "GPQM" },
+	{ OSMO_PFCP_UP_FEAT_MTEDT, "MTEDT" },
+	{ OSMO_PFCP_UP_FEAT_CIOT, "CIOT" },
+	{ OSMO_PFCP_UP_FEAT_ETHAR, "ETHAR" },
+	{ OSMO_PFCP_UP_FEAT_DDDS, "DDDS" },
+	{ OSMO_PFCP_UP_FEAT_RDS, "RDS" },
+	{ OSMO_PFCP_UP_FEAT_RTTWP, "RTTWP" },
+	{}
+};
+
+
+const struct value_string osmo_pfcp_cp_feature_strs[] = {
+	{ OSMO_PFCP_CP_FEAT_LOAD, "LOAD" },
+	{ OSMO_PFCP_CP_FEAT_OVRL, "OVRL" },
+	{ OSMO_PFCP_CP_FEAT_EPFAR, "EPFAR" },
+	{ OSMO_PFCP_CP_FEAT_SSET, "SSET" },
+	{ OSMO_PFCP_CP_FEAT_BUNDL, "BUNDL" },
+	{ OSMO_PFCP_CP_FEAT_MPAS, "MPAS" },
+	{ OSMO_PFCP_CP_FEAT_ARDR, "ARDR" },
+	{ OSMO_PFCP_CP_FEAT_UIAUR, "UIAUR" },
+	{}
+};
+
+const struct value_string osmo_pfcp_apply_action_strs[] = {
+	{ OSMO_PFCP_APPLY_ACTION_DROP, "DROP" },
+	{ OSMO_PFCP_APPLY_ACTION_FORW, "FORW" },
+	{ OSMO_PFCP_APPLY_ACTION_BUFF, "BUFF" },
+	{ OSMO_PFCP_APPLY_ACTION_NOCP, "NOCP" },
+	{ OSMO_PFCP_APPLY_ACTION_DUPL, "DUPL" },
+	{ OSMO_PFCP_APPLY_ACTION_IPMA, "IPMA" },
+	{ OSMO_PFCP_APPLY_ACTION_IPMD, "IPMD" },
+	{ OSMO_PFCP_APPLY_ACTION_DFRT, "DFRT" },
+	{ OSMO_PFCP_APPLY_ACTION_EDRT, "EDRT" },
+	{ OSMO_PFCP_APPLY_ACTION_BDPN, "BDPN" },
+	{ OSMO_PFCP_APPLY_ACTION_DDPN, "DDPN" },
+	{}
+};
+
+const struct value_string osmo_pfcp_outer_header_creation_strs[] = {
+	{ OSMO_PFCP_OUTER_HEADER_CREATION_GTP_U_UDP_IPV4, "GTP_U_UDP_IPV4" },
+	{ OSMO_PFCP_OUTER_HEADER_CREATION_GTP_U_UDP_IPV6, "GTP_U_UDP_IPV6" },
+	{ OSMO_PFCP_OUTER_HEADER_CREATION_UDP_IPV4, "UDP_IPV4" },
+	{ OSMO_PFCP_OUTER_HEADER_CREATION_UDP_IPV6, "UDP_IPV6" },
+	{ OSMO_PFCP_OUTER_HEADER_CREATION_IPV4, "IPV4" },
+	{ OSMO_PFCP_OUTER_HEADER_CREATION_IPV6, "IPV6" },
+	{ OSMO_PFCP_OUTER_HEADER_CREATION_C_TAG, "C_TAG" },
+	{ OSMO_PFCP_OUTER_HEADER_CREATION_S_TAG, "S_TAG" },
+	{ OSMO_PFCP_OUTER_HEADER_CREATION_N19_INDICATION, "N19_INDICATION" },
+	{ OSMO_PFCP_OUTER_HEADER_CREATION_N6_INDICATION, "N6_INDICATION" },
+	{}
+};
+
+const struct value_string osmo_pfcp_outer_header_removal_desc_strs[] = {
+	{ OSMO_PFCP_OUTER_HEADER_REMOVAL_GTP_U_UDP_IPV4, "GTP_U_UDP_IPV4" },
+	{ OSMO_PFCP_OUTER_HEADER_REMOVAL_GTP_U_UDP_IPV6, "GTP_U_UDP_IPV6" },
+	{ OSMO_PFCP_OUTER_HEADER_REMOVAL_UDP_IPV4, "UDP_IPV4" },
+	{ OSMO_PFCP_OUTER_HEADER_REMOVAL_UDP_IPV6, "UDP_IPV6" },
+	{ OSMO_PFCP_OUTER_HEADER_REMOVAL_IPV4, "IPV4" },
+	{ OSMO_PFCP_OUTER_HEADER_REMOVAL_IPV6, "IPV6" },
+	{ OSMO_PFCP_OUTER_HEADER_REMOVAL_GTP_U_UDP_IP, "GTP_U_UDP_IP" },
+	{ OSMO_PFCP_OUTER_HEADER_REMOVAL_VLAN_S_TAG, "VLAN_S_TAG" },
+	{ OSMO_PFCP_OUTER_HEADER_REMOVAL_S_TAG_AND_C_TAG, "S_TAG_AND_C_TAG" },
+	{}
+};
+
+const struct value_string osmo_pfcp_source_iface_strs[] = {
+	{ OSMO_PFCP_SOURCE_IFACE_ACCESS, "Access" },
+	{ OSMO_PFCP_SOURCE_IFACE_CORE, "Core" },
+	{ OSMO_PFCP_SOURCE_IFACE_SGI_LAN_N6_LAN, "SGi-LAN/N6-LAN" },
+	{ OSMO_PFCP_SOURCE_IFACE_CP_FUNCTION, "CP-function" },
+	{ OSMO_PFCP_SOURCE_IFACE_5G_VN_INTERNAL, "5G-VN-Internal" },
+	{}
+};
+
+const struct value_string osmo_pfcp_dest_iface_strs[] = {
+	{ OSMO_PFCP_DEST_IFACE_ACCESS, "Access" },
+	{ OSMO_PFCP_DEST_IFACE_CORE, "Core" },
+	{ OSMO_PFCP_DEST_IFACE_SGI_LAN_N6_LAN, "SGi-LAN/N6-LAN" },
+	{ OSMO_PFCP_DEST_IFACE_CP_FUNCTION, "CP-function" },
+	{ OSMO_PFCP_DEST_IFACE_LI_FUNCTION, "LI-function" },
+	{ OSMO_PFCP_DEST_IFACE_5G_VN_INTERNAL, "5G-VN-Internal" },
+	{}
+};
+
+const struct value_string osmo_pfcp_3gpp_iface_type_strs[] = {
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_S1_U, "S1_U" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_S5_S8_U, "S5_S8_U" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_S4_U, "S4_U" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_S11_U, "S11_U" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_S12_U, "S12_U" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_GN_GP_U, "GN_GP_U" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_S2A_U, "S2A_U" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_S2B_U, "S2B_U" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_ENODEB_GTP_U_INTERFACE_FOR_DL_DATA_FORWARDING, "ENODEB_GTP_U_INTERFACE_FOR_DL_DATA_FORWARDING" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_ENODEB_GTP_U_INTERFACE_FOR_UL_DATA_FORWARDING, "ENODEB_GTP_U_INTERFACE_FOR_UL_DATA_FORWARDING" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_SGW_UPF_GTP_U_INTERFACE_FOR_DL_DATA_FORWARDING, "SGW_UPF_GTP_U_INTERFACE_FOR_DL_DATA_FORWARDING" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_N3_3GPP_ACCESS, "N3_3GPP_ACCESS" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_N3_TRUSTED_NON_3GPP_ACCESS, "N3_TRUSTED_NON_3GPP_ACCESS" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_N3_UNTRUSTED_NON_3GPP_ACCESS, "N3_UNTRUSTED_NON_3GPP_ACCESS" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_N3_FOR_DATA_FORWARDING, "N3_FOR_DATA_FORWARDING" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_N9, "N9" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_SGI, "SGI" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_N6, "N6" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_N19, "N19" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_S8_U, "S8_U" },
+	{ OSMO_PFCP_3GPP_IFACE_TYPE_GP_U, "GP_U" },
+	{}
+};

src/osmo-pfcp-tool/Makefile.am

@@ -10,17 +10,10 @@ AM_CFLAGS = \
 	$(LIBOSMOCORE_CFLAGS) \
 	$(LIBOSMOVTY_CFLAGS) \
 	$(LIBOSMOCTRL_CFLAGS) \
-	$(LIBOSMOGTLV_CFLAGS) \
-	$(LIBOSMOPFCP_CFLAGS) \
 	$(COVERAGE_CFLAGS) \
 	$(NULL)
 
 AM_LDFLAGS = \
-	$(LIBOSMOCORE_LIBS) \
-	$(LIBOSMOVTY_LIBS) \
-	$(LIBOSMOCTRL_LIBS) \
-	$(LIBOSMOGTLV_LIBS) \
-	$(LIBOSMOPFCP_LIBS) \
 	$(COVERAGE_LDFLAGS) \
 	$(NULL)
 
@@ -37,3 +30,12 @@ osmo_pfcp_tool_SOURCES = \
 	pfcp_tool.c \
 	pfcp_tool_vty.c \
 	$(NULL)
+
+osmo_pfcp_tool_LDADD = \
+	$(top_builddir)/src/libosmo-pfcp/libosmo-pfcp.a \
+	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBOSMOCTRL_LIBS) \
+	$(COVERAGE_LDFLAGS) \
+	$(NULL)

src/osmo-pfcp-tool/osmo_pfcp_tool_main.c

@@ -344,7 +344,7 @@ int main(int argc, char **argv)
 		do {
 			if (pfcp_tool_mainloop())
 				break;
-		} while (osmo_pfcp_endpoint_retrans_queue_is_busy(g_pfcp_tool->ep));
+		} while (!llist_empty(&g_pfcp_tool->ep->retrans_queue));
 		printf("Done\n");
 	} else {
 		printf("Listening for commands on VTY...\n");

src/osmo-pfcp-tool/pfcp_tool.c

@@ -146,7 +146,7 @@ static void rx_session_est_resp(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_
 	session->up_f_seid = m->ies.session_est_resp.up_f_seid;
 }
 
-void pfcp_tool_rx_msg(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m, struct osmo_pfcp_msg *req)
+void pfcp_tool_rx_msg(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m)
 {
 	switch (m->h.message_type) {
 	case OSMO_PFCP_MSGT_ASSOC_SETUP_RESP:

src/osmo-pfcp-tool/pfcp_tool.h

@@ -100,7 +100,7 @@ int pfcp_tool_mainloop();
 struct pfcp_tool_peer *pfcp_tool_peer_find_or_create(const struct osmo_sockaddr *remote_addr);
 struct pfcp_tool_session *pfcp_tool_session_find_or_create(struct pfcp_tool_peer *peer, uint64_t cp_seid,
 							   enum up_gtp_action_kind kind);
-void pfcp_tool_rx_msg(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m, struct osmo_pfcp_msg *req);
+void pfcp_tool_rx_msg(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m);
 
 int peer_tx(struct pfcp_tool_peer *peer, struct osmo_pfcp_msg *m);
 uint64_t peer_new_seid(struct pfcp_tool_peer *peer);

src/osmo-pfcp-tool/pfcp_tool_vty.c

@@ -48,7 +48,7 @@ DEFUN(c_local_addr, c_local_addr_cmd,
 {
 	if (g_pfcp_tool->ep != NULL) {
 		vty_out(vty, "Already listening on %s%s",
-			osmo_sockaddr_to_str_c(OTC_SELECT, osmo_pfcp_endpoint_get_local_addr(g_pfcp_tool->ep)),
+			osmo_sockaddr_to_str_c(OTC_SELECT, &g_pfcp_tool->ep->cfg.local_addr),
 			VTY_NEWLINE);
 		return CMD_WARNING;
 	}
@@ -63,43 +63,38 @@ DEFUN(c_listen, c_listen_cmd,
       "Bind local PFCP port and listen; see also 'local-addr'\n")
 {
 	struct osmo_sockaddr_str local_addr;
-	struct osmo_pfcp_endpoint_cfg cfg;
 	int rc;
 
 	OSMO_ASSERT(g_pfcp_tool);
 	if (g_pfcp_tool->ep != NULL) {
 		vty_out(vty, "Already listening on %s%s",
-			osmo_sockaddr_to_str_c(OTC_SELECT, osmo_pfcp_endpoint_get_local_addr(g_pfcp_tool->ep)),
+			osmo_sockaddr_to_str_c(OTC_SELECT, &g_pfcp_tool->ep->cfg.local_addr),
 			VTY_NEWLINE);
 		return CMD_WARNING;
 	}
 
-	cfg = (struct osmo_pfcp_endpoint_cfg){
-		.rx_msg_cb = pfcp_tool_rx_msg,
-	};
+	g_pfcp_tool->ep = osmo_pfcp_endpoint_create(g_pfcp_tool, g_pfcp_tool);
+	if (!g_pfcp_tool->ep) {
+		vty_out(vty, "Failed to allocate PFCP endpoint.%s", VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+	g_pfcp_tool->ep->rx_msg = pfcp_tool_rx_msg;
+	g_pfcp_tool->ep->seq_nr_state = rand();
 
 	/* Translate address string from VTY config to osmo_sockaddr: first read into osmo_sockaddr_str, then write to
 	 * osmo_sockaddr. */
 	osmo_sockaddr_str_from_str(&local_addr, g_pfcp_tool->vty_cfg.local_ip,
 				   g_pfcp_tool->vty_cfg.local_port);
-	osmo_sockaddr_str_to_sockaddr(&local_addr, &cfg.local_addr.u.sas);
+	osmo_sockaddr_str_to_sockaddr(&local_addr, &g_pfcp_tool->ep->cfg.local_addr.u.sas);
 
-	/* Also use this address as the local PFCP Node Id */
-	osmo_pfcp_ie_node_id_from_osmo_sockaddr(&cfg.local_node_id, &cfg.local_addr);
-
-	g_pfcp_tool->ep = osmo_pfcp_endpoint_create(g_pfcp_tool, &cfg);
-	if (!g_pfcp_tool->ep) {
-		vty_out(vty, "Failed to allocate PFCP endpoint.%s", VTY_NEWLINE);
-		return CMD_WARNING;
-	}
-
-	osmo_pfcp_endpoint_set_seq_nr_state(g_pfcp_tool->ep, rand());
+	/* Store this address as the local PFCP Node Id */
+	osmo_pfcp_ie_node_id_from_osmo_sockaddr(&g_pfcp_tool->ep->cfg.local_node_id, &g_pfcp_tool->ep->cfg.local_addr);
 
 	rc = osmo_pfcp_endpoint_bind(g_pfcp_tool->ep);
 	if (rc) {
 		vty_out(vty, "Failed to bind PFCP endpoint on %s: %s%s\n",
-			osmo_sockaddr_to_str_c(OTC_SELECT, osmo_pfcp_endpoint_get_local_addr(g_pfcp_tool->ep)),
-			strerror(rc), VTY_NEWLINE);
+			osmo_sockaddr_to_str_c(OTC_SELECT, &g_pfcp_tool->ep->cfg.local_addr), strerror(rc),
+			VTY_NEWLINE);
 		return CMD_WARNING;
 	}
 	return CMD_SUCCESS;
@@ -150,7 +145,7 @@ DEFUN(peer, peer_cmd,
 	struct osmo_sockaddr remote_addr;
 
 	osmo_sockaddr_str_from_str(&remote_addr_str, argv[0], OSMO_PFCP_PORT);
-	osmo_sockaddr_str_to_sockaddr(&remote_addr_str, (struct sockaddr_storage *)&remote_addr);
+	osmo_sockaddr_str_to_sockaddr(&remote_addr_str, (struct sockaddr_storage*)&remote_addr);
 
 	peer = pfcp_tool_peer_find_or_create(&remote_addr);
 
@@ -198,8 +193,9 @@ DEFUN(peer_tx_assoc_setup_req, peer_tx_assoc_setup_req_cmd,
 		return CMD_WARNING;
 	}
 
-	m = osmo_pfcp_msg_alloc_tx_req(OTC_SELECT, &peer->remote_addr, OSMO_PFCP_MSGT_ASSOC_SETUP_REQ);
-	m->ies.assoc_setup_req.recovery_time_stamp = osmo_pfcp_endpoint_get_recovery_timestamp(g_pfcp_tool->ep);
+	m = osmo_pfcp_msg_alloc_tx(OTC_SELECT, &peer->remote_addr, &g_pfcp_tool->ep->cfg.local_node_id, NULL,
+				   OSMO_PFCP_MSGT_ASSOC_SETUP_REQ);
+	m->ies.assoc_setup_req.recovery_time_stamp = g_pfcp_tool->ep->recovery_time_stamp;
 
 	m->ies.assoc_setup_req.cp_function_features_present = true;
 	osmo_pfcp_bits_set(m->ies.assoc_setup_req.cp_function_features.bits, OSMO_PFCP_CP_FEAT_BUNDL, true);
@@ -226,9 +222,7 @@ DEFUN(peer_retrans_req, peer_retrans_req_cmd,
 		return CMD_WARNING;
 	}
 
-	/* Allocate using API function to have the usual talloc destructor set up, then copy the last request or
-	 * response over it. */
-	m = osmo_pfcp_msg_alloc_rx(OTC_SELECT, &peer->remote_addr);
+	m = osmo_pfcp_msg_alloc_tx(OTC_SELECT, &peer->remote_addr, &g_pfcp_tool->ep->cfg.local_node_id, NULL, 0);
 	if (strcmp(argv[0], "req") == 0)
 		*m = peer->last_req;
 	else
@@ -372,7 +366,7 @@ int session_endecaps_tx_est_req(struct vty *vty, const char **argv, int argc)
 				.teid = session->access.teid.local,
 				.ip_addr = {
 					.v4_present = true,
-					.v4 = osmo_pfcp_endpoint_get_cfg(g_pfcp_tool->ep)->local_addr,
+					.v4 = g_pfcp_tool->ep->cfg.local_addr,
 				},
 			},
 		};
@@ -396,9 +390,10 @@ int session_endecaps_tx_est_req(struct vty *vty, const char **argv, int argc)
 	cp_f_seid = (struct osmo_pfcp_ie_f_seid){
 		.seid = session->cp_seid,
 	};
-	osmo_pfcp_ip_addrs_set(&cp_f_seid.ip_addr, osmo_pfcp_endpoint_get_local_addr(g_pfcp_tool->ep));
+	osmo_pfcp_ip_addrs_set(&cp_f_seid.ip_addr, &g_pfcp_tool->ep->cfg.local_addr);
 
-	m = osmo_pfcp_msg_alloc_tx_req(OTC_SELECT, &peer->remote_addr, OSMO_PFCP_MSGT_SESSION_EST_REQ);
+	m = osmo_pfcp_msg_alloc_tx(OTC_SELECT, &peer->remote_addr, &g_pfcp_tool->ep->cfg.local_node_id, NULL,
+				   OSMO_PFCP_MSGT_SESSION_EST_REQ);
 	m->h.seid_present = true;
 	/* the UPF has yet to assign a SEID for itself, no matter what SEID we (the CPF) use for this session */
 	m->h.seid = 0;
@@ -513,7 +508,7 @@ int session_tunmap_tx_est_req(struct vty *vty, const char **argv, int argc)
 				.teid = session->access.teid.local,
 				.ip_addr = {
 					.v4_present = true,
-					.v4 = osmo_pfcp_endpoint_get_cfg(g_pfcp_tool->ep)->local_addr,
+					.v4 = g_pfcp_tool->ep->cfg.local_addr,
 				},
 			},
 		};
@@ -547,7 +542,7 @@ int session_tunmap_tx_est_req(struct vty *vty, const char **argv, int argc)
 				.teid = session->core.teid.local,
 				.ip_addr = {
 					.v4_present = true,
-					.v4 = osmo_pfcp_endpoint_get_cfg(g_pfcp_tool->ep)->local_addr,
+					.v4 = g_pfcp_tool->ep->cfg.local_addr,
 				},
 			},
 		};
@@ -570,9 +565,10 @@ int session_tunmap_tx_est_req(struct vty *vty, const char **argv, int argc)
 	cp_f_seid = (struct osmo_pfcp_ie_f_seid){
 		.seid = session->cp_seid,
 	};
-	osmo_pfcp_ip_addrs_set(&cp_f_seid.ip_addr, osmo_pfcp_endpoint_get_local_addr(g_pfcp_tool->ep));
+	osmo_pfcp_ip_addrs_set(&cp_f_seid.ip_addr, &g_pfcp_tool->ep->cfg.local_addr);
 
-	m = osmo_pfcp_msg_alloc_tx_req(OTC_SELECT, &peer->remote_addr, OSMO_PFCP_MSGT_SESSION_EST_REQ);
+	m = osmo_pfcp_msg_alloc_tx(OTC_SELECT, &peer->remote_addr, &g_pfcp_tool->ep->cfg.local_node_id, NULL,
+				   OSMO_PFCP_MSGT_SESSION_EST_REQ);
 	m->h.seid_present = true;
 	m->h.seid = 0;
 	/* GTP tunmap: remove header from both directions, and add header in both directions */
@@ -690,9 +686,10 @@ DEFUN(session_tx_mod_req, session_tx_mod_req_cmd,
 	cp_f_seid = (struct osmo_pfcp_ie_f_seid){
 		.seid = session->cp_seid,
 	};
-	osmo_pfcp_ip_addrs_set(&cp_f_seid.ip_addr, osmo_pfcp_endpoint_get_local_addr(g_pfcp_tool->ep));
+	osmo_pfcp_ip_addrs_set(&cp_f_seid.ip_addr, &g_pfcp_tool->ep->cfg.local_addr);
 
-	m = osmo_pfcp_msg_alloc_tx_req(OTC_SELECT, &peer->remote_addr, OSMO_PFCP_MSGT_SESSION_MOD_REQ);
+	m = osmo_pfcp_msg_alloc_tx(OTC_SELECT, &peer->remote_addr, &g_pfcp_tool->ep->cfg.local_node_id, NULL,
+				   OSMO_PFCP_MSGT_SESSION_MOD_REQ);
 	m->h.seid_present = true;
 	m->h.seid = session->up_f_seid.seid;
 	m->ies.session_mod_req = (struct osmo_pfcp_msg_session_mod_req){
@@ -735,7 +732,8 @@ DEFUN(session_tx_del_req, session_tx_del_req_cmd,
 		return CMD_WARNING;
 	}
 
-	m = osmo_pfcp_msg_alloc_tx_req(OTC_SELECT, &peer->remote_addr, OSMO_PFCP_MSGT_SESSION_DEL_REQ);
+	m = osmo_pfcp_msg_alloc_tx(OTC_SELECT, &peer->remote_addr, &g_pfcp_tool->ep->cfg.local_node_id, NULL,
+				   OSMO_PFCP_MSGT_SESSION_DEL_REQ);
 	m->h.seid_present = true;
 	m->h.seid = session->up_f_seid.seid;
 

src/osmo-upf/Makefile.am

@@ -10,8 +10,6 @@ AM_CFLAGS = \
 	$(LIBOSMOCORE_CFLAGS) \
 	$(LIBOSMOVTY_CFLAGS) \
 	$(LIBOSMOCTRL_CFLAGS) \
-	$(LIBOSMOGTLV_CFLAGS) \
-	$(LIBOSMOPFCP_CFLAGS) \
 	$(LIBGTPNL_CFLAGS) \
 	$(LIBNFTNL_CFLAGS) \
 	$(LIBNFTABLES_CFLAGS) \
@@ -43,11 +41,11 @@ osmo_upf_SOURCES = \
 	$(NULL)
 
 osmo_upf_LDADD = \
+	$(top_builddir)/src/libosmo-pfcp/libosmo-pfcp.a \
+	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.a \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOVTY_LIBS) \
 	$(LIBOSMOCTRL_LIBS) \
-	$(LIBOSMOGTLV_LIBS) \
-	$(LIBOSMOPFCP_LIBS) \
 	$(LIBGTPNL_LIBS) \
 	$(LIBNFTNL_LIBS) \
 	$(LIBNFTABLES_LIBS) \

src/osmo-upf/osmo_upf_main.c

@@ -185,7 +185,7 @@ static void signal_handler(int signum)
 		 * return, but program wouldn't exit if an external SIGABRT is
 		 * received.
 		 */
-		talloc_report(tall_vty_ctx, stderr);
+		//talloc_report(tall_vty_ctx, stderr);
 		talloc_report_full(tall_upf_ctx, stderr);
 		signal(SIGABRT, SIG_DFL);
 		raise(SIGABRT);
@@ -348,7 +348,7 @@ int main(int argc, char **argv)
 		osmo_select_main_ctx(0);
 
 		/* If the user hits Ctrl-C the third time, just terminate immediately. */
-		if (quit >= 3)
+		if (quit >= 1) //3)
 			break;
 
 		/* Has SIGTERM been received (and not yet been handled)? */
@@ -377,10 +377,10 @@ int main(int argc, char **argv)
 	talloc_report_full(tall_infra_ctx, stderr);
 	talloc_free(tall_infra_ctx);
 
-	talloc_report(tall_vty_ctx, stderr);
+	//talloc_report_full(tall_vty_ctx, stderr);
 	talloc_free(tall_vty_ctx);
 
-	talloc_report_full(NULL, stderr);
+	//talloc_report_full(NULL, stderr);
 	talloc_disable_null_tracking();
 	return 0;
 }

src/osmo-upf/up_endpoint.c

@@ -23,25 +23,17 @@
 
 #include <osmocom/pfcp/pfcp_endpoint.h>
 #include <osmocom/pfcp/pfcp_msg.h>
+#include <osmocom/pfcp/pfcp_heartbeat_fsm.h>
 
 #include <osmocom/upf/up_endpoint.h>
 #include <osmocom/upf/up_peer.h>
 #include <osmocom/upf/up_session.h>
 
-static void up_endpoint_set_msg_ctx(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m, struct osmo_pfcp_msg *req)
+static void up_endpoint_set_msg_ctx(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m)
 {
-	struct up_endpoint *up_ep = osmo_pfcp_endpoint_get_cfg(ep)->priv;
+	struct up_endpoint *up_ep = ep->priv;
 	struct up_peer *peer;
 
-	/* If this is a response to an earlier request, just take the msg context from the request message. */
-	if (req) {
-		if (!m->ctx.peer_fi && req->ctx.peer_fi)
-			up_peer_set_msg_ctx(req->ctx.peer_fi->priv, m);
-		if (!m->ctx.session_fi && req->ctx.session_fi)
-			up_session_set_msg_ctx(req->ctx.peer_fi->priv, m);
-	}
-
-	/* From the remote address, find the matching peer instance */
 	if (!m->ctx.peer_fi) {
 		peer = up_peer_find(up_ep, &m->remote_addr);
 		if (peer) {
@@ -62,21 +54,50 @@ static void up_endpoint_set_msg_ctx(struct osmo_pfcp_endpoint *ep, struct osmo_p
 }
 
 static void up_ep_rx_not_impl_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m,
-				  enum osmo_pfcp_message_type resp_msgt, enum osmo_pfcp_cause cause)
+				  enum osmo_pfcp_message_type resp_msgt,
+				  const struct osmo_pfcp_ie_node_id *node_id, enum osmo_pfcp_cause cause)
 {
 	struct osmo_pfcp_msg *tx;
 	enum osmo_pfcp_cause *tx_cause;
 	OSMO_LOG_PFCP_MSG(m, LOGL_ERROR, "message type not implemented\n");
-	tx = osmo_pfcp_msg_alloc_tx_resp(OTC_SELECT, m, resp_msgt);
+	tx = osmo_pfcp_msg_alloc_tx(OTC_SELECT, NULL, &up_ep->pfcp_ep->cfg.local_node_id, m, resp_msgt);
 	tx_cause = osmo_pfcp_msg_cause(tx);
 	if (tx_cause)
 		*tx_cause = cause;
 	osmo_pfcp_endpoint_tx(up_ep->pfcp_ep, tx);
+	return;
+}
+
+static void up_ep_rx_heartbeat_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
+{
+	struct up_peer *peer = m->ctx.peer_fi ? m->ctx.peer_fi->priv : NULL;
+	/* osmo_pfcp_endpoint_handle_rx() has already taken care of the heartbeat response. Just dispatch the event
+	 * here. */
+	/* If the peer is not associated / not known, we don't care that a heartbeat happened. */
+	if (!peer || !peer->heartbeat_fi)
+		return;
+	osmo_fsm_inst_dispatch(peer->heartbeat_fi, OSMO_PFCP_HEARTBEAT_EV_RX_REQ, (void*)m);
+}
+
+static void up_ep_rx_heartbeat_resp(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
+{
+	struct up_peer *peer = m->ctx.peer_fi ? m->ctx.peer_fi->priv : NULL;
+	if (!peer) {
+		OSMO_LOG_PFCP_MSG(m, LOGL_INFO, "Heartbeat response from unknown peer %s\n",
+				  osmo_sockaddr_to_str_c(OTC_SELECT, &m->remote_addr));
+		return;
+	}
+	if (!peer->heartbeat_fi) {
+		OSMO_LOG_PFCP_MSG(m, LOGL_INFO, "Heartbeat response, but peer is not associated %s\n",
+				  osmo_sockaddr_to_str_c(OTC_SELECT, &m->remote_addr));
+		return;
+	}
+	osmo_fsm_inst_dispatch(peer->heartbeat_fi, OSMO_PFCP_HEARTBEAT_EV_RX_RESP, (void*)m);
 }
 
 static void up_ep_rx_pfd_mgmt_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
 {
-	up_ep_rx_not_impl_req(up_ep, m, OSMO_PFCP_MSGT_PFD_MGMT_RESP, OSMO_PFCP_CAUSE_SERVICE_NOT_SUPPORTED);
+	up_ep_rx_not_impl_req(up_ep, m, OSMO_PFCP_MSGT_PFD_MGMT_RESP, NULL, OSMO_PFCP_CAUSE_SERVICE_NOT_SUPPORTED);
 }
 
 static void up_ep_rx_assoc_setup_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
@@ -86,7 +107,7 @@ static void up_ep_rx_assoc_setup_req(struct up_endpoint *up_ep, const struct osm
 		peer = up_peer_find_or_add(up_ep, &m->remote_addr);
 		OSMO_ASSERT(peer);
 	}
-	osmo_fsm_inst_dispatch(peer->fi, UP_PEER_EV_RX_ASSOC_SETUP_REQ, (void *)m);
+	osmo_fsm_inst_dispatch(peer->fi, UP_PEER_EV_RX_ASSOC_SETUP_REQ, (void*)m);
 }
 
 static void up_ep_rx_assoc_upd_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
@@ -94,11 +115,12 @@ static void up_ep_rx_assoc_upd_req(struct up_endpoint *up_ep, const struct osmo_
 	if (!m->ctx.peer_fi) {
 		struct osmo_pfcp_msg *tx;
 		OSMO_LOG_PFCP_MSG(m, LOGL_ERROR, "Peer is not associated, cannot update association\n");
-		tx = osmo_pfcp_msg_alloc_tx_resp(OTC_SELECT, m, OSMO_PFCP_MSGT_ASSOC_UPDATE_RESP);
+		tx = osmo_pfcp_msg_alloc_tx(OTC_SELECT, NULL, &up_ep->pfcp_ep->cfg.local_node_id, m, OSMO_PFCP_MSGT_ASSOC_UPDATE_RESP);
+		/* FIXME set node_id, cause */
 		osmo_pfcp_endpoint_tx(up_ep->pfcp_ep, tx);
 		return;
 	}
-	osmo_fsm_inst_dispatch(m->ctx.peer_fi, UP_PEER_EV_RX_ASSOC_UPD_REQ, (void *)m);
+	osmo_fsm_inst_dispatch(m->ctx.peer_fi, UP_PEER_EV_RX_ASSOC_UPD_REQ, (void*)m);
 }
 
 static void up_ep_rx_assoc_rel_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
@@ -106,22 +128,24 @@ static void up_ep_rx_assoc_rel_req(struct up_endpoint *up_ep, const struct osmo_
 	if (!m->ctx.peer_fi) {
 		struct osmo_pfcp_msg *tx;
 		OSMO_LOG_PFCP_MSG(m, LOGL_ERROR, "Peer is not associated. Sending ACK response anyway\n");
-		tx = osmo_pfcp_msg_alloc_tx_resp(OTC_SELECT, m, OSMO_PFCP_MSGT_ASSOC_RELEASE_RESP);
+		tx = osmo_pfcp_msg_alloc_tx(OTC_SELECT, NULL, &up_ep->pfcp_ep->cfg.local_node_id, m, OSMO_PFCP_MSGT_ASSOC_RELEASE_RESP);
+		/* FIXME set node_id, cause */
 		osmo_pfcp_endpoint_tx(up_ep->pfcp_ep, tx);
 		return;
 	}
-	osmo_fsm_inst_dispatch(m->ctx.peer_fi, UP_PEER_EV_RX_ASSOC_REL_REQ, (void *)m);
+	osmo_fsm_inst_dispatch(m->ctx.peer_fi, UP_PEER_EV_RX_ASSOC_REL_REQ, (void*)m);
 }
 
 static void up_ep_rx_node_report_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
 {
-	up_ep_rx_not_impl_req(up_ep, m, OSMO_PFCP_MSGT_NODE_REPORT_RESP, OSMO_PFCP_CAUSE_SERVICE_NOT_SUPPORTED);
+	up_ep_rx_not_impl_req(up_ep, m, OSMO_PFCP_MSGT_NODE_REPORT_RESP, NULL /* FIXME? */,
+			      OSMO_PFCP_CAUSE_SERVICE_NOT_SUPPORTED);
 }
 
 static void up_ep_rx_session_set_del_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
 {
 	up_ep_rx_not_impl_req(up_ep, m, OSMO_PFCP_MSGT_SESSION_SET_DEL_RESP,
-			      OSMO_PFCP_CAUSE_SERVICE_NOT_SUPPORTED);
+			      &up_ep->pfcp_ep->cfg.local_node_id, OSMO_PFCP_CAUSE_SERVICE_NOT_SUPPORTED);
 }
 
 static void up_ep_rx_session_est_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
@@ -129,12 +153,12 @@ static void up_ep_rx_session_est_req(struct up_endpoint *up_ep, const struct osm
 	if (!m->ctx.peer_fi) {
 		struct osmo_pfcp_msg *tx;
 		OSMO_LOG_PFCP_MSG(m, LOGL_ERROR, "Peer is not associated, cannot establish session\n");
-		tx = osmo_pfcp_msg_alloc_tx_resp(OTC_SELECT, m, OSMO_PFCP_MSGT_SESSION_EST_RESP);
+		tx = osmo_pfcp_msg_alloc_tx(OTC_SELECT, NULL, &up_ep->pfcp_ep->cfg.local_node_id, m, OSMO_PFCP_MSGT_SESSION_EST_RESP);
 		tx->ies.session_est_resp.cause = OSMO_PFCP_CAUSE_NO_ESTABLISHED_PFCP_ASSOC;
 		osmo_pfcp_endpoint_tx(up_ep->pfcp_ep, tx);
 		return;
 	}
-	osmo_fsm_inst_dispatch(m->ctx.peer_fi, UP_PEER_EV_RX_SESSION_EST_REQ, (void *)m);
+	osmo_fsm_inst_dispatch(m->ctx.peer_fi, UP_PEER_EV_RX_SESSION_EST_REQ, (void*)m);
 }
 
 static void up_ep_rx_session_mod_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
@@ -142,7 +166,8 @@ static void up_ep_rx_session_mod_req(struct up_endpoint *up_ep, const struct osm
 	if (!m->ctx.session_fi) {
 		/* Session not found. */
 		struct osmo_pfcp_msg *tx;
-		tx = osmo_pfcp_msg_alloc_tx_resp(OTC_SELECT, m, OSMO_PFCP_MSGT_SESSION_MOD_RESP);
+		tx = osmo_pfcp_msg_alloc_tx(OTC_SELECT, NULL, &up_ep->pfcp_ep->cfg.local_node_id, m,
+					    OSMO_PFCP_MSGT_SESSION_MOD_RESP);
 		if (!m->ctx.peer_fi) {
 			/* Not even the peer is associated. */
 			OSMO_LOG_PFCP_MSG(m, LOGL_ERROR, "Peer is not associated, cannot modify session\n");
@@ -156,7 +181,7 @@ static void up_ep_rx_session_mod_req(struct up_endpoint *up_ep, const struct osm
 		osmo_pfcp_endpoint_tx(up_ep->pfcp_ep, tx);
 		return;
 	}
-	osmo_fsm_inst_dispatch(m->ctx.session_fi, UP_SESSION_EV_RX_SESSION_MOD_REQ, (void *)m);
+	osmo_fsm_inst_dispatch(m->ctx.session_fi, UP_SESSION_EV_RX_SESSION_MOD_REQ, (void*)m);
 }
 
 static void up_ep_rx_session_del_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
@@ -164,7 +189,7 @@ static void up_ep_rx_session_del_req(struct up_endpoint *up_ep, const struct osm
 	if (!m->ctx.session_fi) {
 		/* Session not found. */
 		struct osmo_pfcp_msg *tx;
-		tx = osmo_pfcp_msg_alloc_tx_resp(OTC_SELECT, m, OSMO_PFCP_MSGT_SESSION_DEL_RESP);
+		tx = osmo_pfcp_msg_alloc_tx(OTC_SELECT, NULL, &up_ep->pfcp_ep->cfg.local_node_id, m, OSMO_PFCP_MSGT_SESSION_DEL_RESP);
 		if (!m->ctx.peer_fi) {
 			/* Not even the peer is associated. */
 			OSMO_LOG_PFCP_MSG(m, LOGL_ERROR, "Peer is not associated, cannot delete session\n");
@@ -178,19 +203,25 @@ static void up_ep_rx_session_del_req(struct up_endpoint *up_ep, const struct osm
 		osmo_pfcp_endpoint_tx(up_ep->pfcp_ep, tx);
 		return;
 	}
-	osmo_fsm_inst_dispatch(m->ctx.session_fi, UP_SESSION_EV_RX_SESSION_DEL_REQ, (void *)m);
+	osmo_fsm_inst_dispatch(m->ctx.session_fi, UP_SESSION_EV_RX_SESSION_DEL_REQ, (void*)m);
 }
 
 static void up_ep_rx_session_rep_req(struct up_endpoint *up_ep, const struct osmo_pfcp_msg *m)
 {
-	up_ep_rx_not_impl_req(up_ep, m, OSMO_PFCP_MSGT_SESSION_REP_RESP, OSMO_PFCP_CAUSE_SERVICE_NOT_SUPPORTED);
+	up_ep_rx_not_impl_req(up_ep, m, OSMO_PFCP_MSGT_SESSION_REP_RESP, NULL, OSMO_PFCP_CAUSE_SERVICE_NOT_SUPPORTED);
 }
 
-static void up_endpoint_rx_cb(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m, struct osmo_pfcp_msg *req)
+static void up_endpoint_rx_cb(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_msg *m)
 {
-	struct up_endpoint *up_ep = osmo_pfcp_endpoint_get_priv(ep);
+	struct up_endpoint *up_ep = ep->priv;
 
 	switch (m->h.message_type) {
+	case OSMO_PFCP_MSGT_HEARTBEAT_REQ:
+		up_ep_rx_heartbeat_req(up_ep, m);
+		return;
+	case OSMO_PFCP_MSGT_HEARTBEAT_RESP:
+		up_ep_rx_heartbeat_resp(up_ep, m);
+		return;
 	case OSMO_PFCP_MSGT_PFD_MGMT_REQ:
 		up_ep_rx_pfd_mgmt_req(up_ep, m);
 		return;
@@ -230,21 +261,17 @@ static void up_endpoint_rx_cb(struct osmo_pfcp_endpoint *ep, struct osmo_pfcp_ms
 struct up_endpoint *up_endpoint_init(void *ctx, const struct osmo_sockaddr *local_addr)
 {
 	int rc;
-	struct osmo_pfcp_endpoint_cfg cfg;
 	struct up_endpoint *up_ep;
 	up_ep = talloc_zero(ctx, struct up_endpoint);
 	INIT_LLIST_HEAD(&up_ep->peers);
 
-	cfg = (struct osmo_pfcp_endpoint_cfg){
-		.local_addr = *local_addr,
-		.set_msg_ctx_cb = up_endpoint_set_msg_ctx,
-		.rx_msg_cb = up_endpoint_rx_cb,
-		.priv = up_ep,
-	};
-	osmo_pfcp_ie_node_id_from_osmo_sockaddr(&cfg.local_node_id, local_addr);
+	up_ep->pfcp_ep = osmo_pfcp_endpoint_create(up_ep, up_ep);
+	up_ep->pfcp_ep->cfg.local_addr = *local_addr;
 
-	up_ep->pfcp_ep = osmo_pfcp_endpoint_create(up_ep, &cfg);
-	OSMO_ASSERT(up_ep->pfcp_ep);
+	up_ep->pfcp_ep->set_msg_ctx = up_endpoint_set_msg_ctx;
+	up_ep->pfcp_ep->rx_msg = up_endpoint_rx_cb;
+
+	osmo_pfcp_ie_node_id_from_osmo_sockaddr(&up_ep->pfcp_ep->cfg.local_node_id, local_addr);
 
 	rc = osmo_pfcp_endpoint_bind(up_ep->pfcp_ep);
 	if (rc) {
@@ -276,11 +303,19 @@ static struct up_session *up_endpoint_find_session_by_local_teid(struct up_endpo
 		return NULL;
 }
 
+static uint64_t up_endpoint_inc_seid(struct up_endpoint *ep)
+{
+	ep->next_seid_state++;
+	if (!ep->next_seid_state)
+		ep->next_seid_state++;
+	return ep->next_seid_state;
+}
+
 uint64_t up_endpoint_next_seid(struct up_endpoint *ep)
 {
 	uint64_t sanity;
 	for (sanity = 2342; sanity; sanity--) {
-		uint64_t next_seid = osmo_pfcp_next_seid(&ep->next_seid_state);
+		uint64_t next_seid = up_endpoint_inc_seid(ep);
 		if (up_endpoint_find_session(ep, next_seid))
 			continue;
 		return next_seid;

src/osmo-upf/up_gtp_action.c

@@ -41,17 +41,18 @@ int up_gtp_action_cmp(const struct up_gtp_action *a, const struct up_gtp_action
 	if (!b)
 		return 1;
 
-#define CMP_MEMB(MEMB) OSMO_CMP(a->MEMB, b->MEMB)
+#define CMP_RET(MEMB) do { \
+		int _cmp = OSMO_CMP(a->MEMB, b->MEMB); \
+		if (_cmp) \
+			return _cmp; \
+	} while (0)
 
-	if ((cmp = CMP_MEMB(kind)))
-		return cmp;
+	CMP_RET(kind);
 
 	switch (a->kind) {
 	case UP_GTP_U_ENDECAPS:
-		if ((cmp = CMP_MEMB(endecaps.local_teid)))
-			return cmp;
-		if ((cmp = CMP_MEMB(endecaps.remote_teid)))
-			return cmp;
+		CMP_RET(endecaps.local_teid);
+		CMP_RET(endecaps.remote_teid);
 		cmp = osmo_sockaddr_cmp(&a->endecaps.gtp_remote_addr, &b->endecaps.gtp_remote_addr);
 		if (cmp)
 			return cmp;
@@ -61,14 +62,10 @@ int up_gtp_action_cmp(const struct up_gtp_action *a, const struct up_gtp_action
 		break;
 
 	case UP_GTP_U_TUNMAP:
-		if ((cmp = CMP_MEMB(tunmap.access.local_teid)))
-			return cmp;
-		if ((cmp = CMP_MEMB(tunmap.access.remote_teid)))
-			return cmp;
-		if ((cmp = CMP_MEMB(tunmap.core.local_teid)))
-			return cmp;
-		if ((cmp = CMP_MEMB(tunmap.core.remote_teid)))
-			return cmp;
+		CMP_RET(tunmap.access.local_teid);
+		CMP_RET(tunmap.access.remote_teid);
+		CMP_RET(tunmap.core.local_teid);
+		CMP_RET(tunmap.core.remote_teid);
 		break;
 	default:
 		break;
@@ -83,12 +80,6 @@ static int up_gtp_action_enable_disable(struct up_gtp_action *a, bool enable)
 
 	switch (a->kind) {
 	case UP_GTP_U_ENDECAPS:
-		if (g_upf->gtp.mockup) {
-			LOG_UP_GTP_ACTION(a, LOGL_NOTICE, "gtp/mockup active, skipping GTP action %s\n",
-					  enable ? "enable" : "disable");
-			return 0;
-		}
-
 		/* use the first available GTP device.
 		 * TODO: select by interface name?
 		 */
@@ -111,12 +102,6 @@ static int up_gtp_action_enable_disable(struct up_gtp_action *a, bool enable)
 		return 0;
 
 	case UP_GTP_U_TUNMAP:
-		if (g_upf->nft.mockup) {
-			LOG_UP_GTP_ACTION(a, LOGL_NOTICE, "nft/mockup active, skipping nftables ruleset %s\n",
-					  enable ? "enable" : "disable");
-			return 0;
-		}
-
 		if (enable && a->tunmap.id != 0) {
 			LOG_UP_GTP_ACTION(a, LOGL_ERROR,
 					  "Cannot enable: nft GTP tunnel mapping rule has been enabled before"

src/osmo-upf/up_peer.c

@@ -87,7 +87,7 @@ static int up_peer_use_cb(struct osmo_use_count_entry *e, int32_t old_use_count,
 
 	LOGPFSMSLSRC(peer->fi, DREF, level, file, line,
 		     "%s %s: now used by %s\n",
-		     (e->count - old_use_count) > 0 ? "+" : "-", e->use,
+		     (e->count - old_use_count) > 0? "+" : "-", e->use,
 		     osmo_use_count_to_str_c(OTC_SELECT, &peer->use_count));
 
 	if (e->count < 0)
@@ -101,11 +101,11 @@ static int up_peer_use_cb(struct osmo_use_count_entry *e, int32_t old_use_count,
 char *up_peer_remote_addr_str(struct up_peer *peer)
 {
 	struct osmo_sockaddr remote_addr = peer->remote_addr;
-
+#if 1
 	/* Zero the port, it is not interesting information. The port for PFCP is defined fixed, and there is no use
 	 * printing it in the logs */
 	osmo_sockaddr_set_port(&remote_addr.u.sa, 0);
-
+#endif
 	return osmo_sockaddr_to_str_c(OTC_SELECT, &remote_addr);
 }
 
@@ -194,11 +194,9 @@ void up_peer_set_msg_ctx(struct up_peer *peer, struct osmo_pfcp_msg *m)
 struct osmo_pfcp_msg *up_peer_init_tx(struct up_peer *peer, struct osmo_pfcp_msg *in_reply_to,
 				      enum osmo_pfcp_message_type message_type)
 {
-	struct osmo_pfcp_msg *tx;
-	if (in_reply_to)
-		tx = osmo_pfcp_msg_alloc_tx_resp(OTC_SELECT, in_reply_to, message_type);
-	else
-		tx = osmo_pfcp_msg_alloc_tx_req(OTC_SELECT, &peer->remote_addr, message_type);
+	struct osmo_pfcp_msg *tx = osmo_pfcp_msg_alloc_tx(OTC_SELECT, &peer->remote_addr,
+							  &peer->up_endpoint->pfcp_ep->cfg.local_node_id,
+							  in_reply_to, message_type);
 	up_peer_set_msg_ctx(peer, tx);
 	return tx;
 }
@@ -211,10 +209,11 @@ static int up_peer_tx_assoc_setup_resp(struct up_peer *peer, struct osmo_pfcp_ms
 
 	resp->ies.assoc_setup_resp = (struct osmo_pfcp_msg_assoc_setup_resp) {
 		.cause = cause,
-		.recovery_time_stamp = osmo_pfcp_endpoint_get_recovery_timestamp(g_upf->pfcp.ep->pfcp_ep),
+		.recovery_time_stamp = g_upf->pfcp.ep->pfcp_ep->recovery_time_stamp,
 		.up_function_features_present = true,
 		.up_function_features = peer->local_up_features,
 	};
+	resp->ies.assoc_setup_resp.recovery_time_stamp = g_upf->pfcp.ep->pfcp_ep->recovery_time_stamp;
 
 	if (osmo_pfcp_endpoint_tx(peer->up_endpoint->pfcp_ep, resp)) {
 		OSMO_LOG_PFCP_MSG(resp, LOGL_ERROR, "Error sending response, cannot associate with peer\n");
@@ -258,6 +257,9 @@ static void up_peer_rx_assoc_setup_req(struct up_peer *peer, struct osmo_pfcp_ms
 	struct osmo_fsm_inst *fi = peer->fi;
 	enum osmo_pfcp_cause cause = OSMO_PFCP_CAUSE_REQUEST_ACCEPTED;
 
+	if (m->ies.assoc_setup_req.cp_function_features_present)
+		peer->peer_cp_features = m->ies.assoc_setup_req.cp_function_features;
+
 	if (fi->state == UP_PEER_ST_ASSOCIATED) {
 		/* Retransmissions of the ACK response happen in pfcp_endpoint.c. So if we get this, it is a genuine
 		 * duplicate association setup request. We could reject it. But why. Just "replace" with the new
@@ -271,25 +273,23 @@ static void up_peer_rx_assoc_setup_req(struct up_peer *peer, struct osmo_pfcp_ms
 			LOGPFSML(fi, LOGL_NOTICE, "another Association Setup Request, with same Recovery Timestamp."
 				 " Keeping sessions, sending ACK.\n");
 		}
-	} else if (up_peer_fsm_state_chg(UP_PEER_ST_ASSOCIATED)) {
+	}
+
+	peer->remote_recovery_timestamp = m->ies.assoc_setup_req.recovery_time_stamp;
+
+	if (up_peer_fsm_state_chg(UP_PEER_ST_ASSOCIATED)) {
 		/* Not allowed to transition to ST_ASSOCIATED */
 		cause = OSMO_PFCP_CAUSE_REQUEST_REJECTED;
 	} else {
-		/* Successfully transitioned to ST_ASSOCIATED */
-		peer->remote_recovery_timestamp = m->ies.assoc_setup_req.recovery_time_stamp;
-		peer->remote_node_id = m->ies.assoc_setup_req.node_id;
-		if (m->ies.assoc_setup_req.cp_function_features_present)
-			peer->peer_cp_features = m->ies.assoc_setup_req.cp_function_features;
+		/* Remember the Node ID that the peer sent */
+		struct osmo_pfcp_ie_node_id *m_node_id = osmo_pfcp_msg_node_id(m);
+		OSMO_ASSERT(m_node_id);
+		peer->remote_node_id = *m_node_id;
 	}
 
 	if (up_peer_tx_assoc_setup_resp(peer, m, cause)
 	    || cause != OSMO_PFCP_CAUSE_REQUEST_ACCEPTED)
 		up_peer_fsm_state_chg(UP_PEER_ST_WAIT_USE_COUNT);
-
-	LOGPFSML(fi, LOGL_NOTICE, "Peer associated, Node-Id=%s. Local UP features: [%s]; Peer CP features: [%s]\n",
-		 osmo_pfcp_ie_node_id_to_str_c(OTC_SELECT, &peer->remote_node_id),
-		 osmo_pfcp_bits_to_str_c(OTC_SELECT, peer->local_up_features.bits, osmo_pfcp_up_feature_strs),
-		 osmo_pfcp_bits_to_str_c(OTC_SELECT, peer->peer_cp_features.bits, osmo_pfcp_cp_feature_strs));
 }
 
 static void up_peer_rx_assoc_rel_req(struct up_peer *peer, struct osmo_pfcp_msg *m)
@@ -348,6 +348,14 @@ static void up_peer_not_associated_action(struct osmo_fsm_inst *fi, uint32_t eve
 	}
 }
 
+static void up_peer_associated_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
+{
+	struct up_peer *peer = fi->priv;
+	LOGPFSML(fi, LOGL_NOTICE, "Peer associated. Local UP features: [%s]; Peer CP features: [%s]\n",
+		 osmo_pfcp_bits_to_str_c(OTC_SELECT, peer->local_up_features.bits, osmo_pfcp_up_feature_strs),
+		 osmo_pfcp_bits_to_str_c(OTC_SELECT, peer->peer_cp_features.bits, osmo_pfcp_cp_feature_strs));
+}
+
 static void up_peer_associated_action(struct osmo_fsm_inst *fi, uint32_t event, void *data)
 {
 	struct up_peer *peer = fi->priv;
@@ -381,10 +389,8 @@ static void up_peer_associated_action(struct osmo_fsm_inst *fi, uint32_t event,
 
 static void up_peer_associated_onleave(struct osmo_fsm_inst *fi, uint32_t next_state)
 {
-	struct up_peer *peer = fi->priv;
 	if (next_state != UP_PEER_ST_ASSOCIATED)
-		LOGPFSML(fi, LOGL_NOTICE, "Peer %s released\n",
-			 osmo_pfcp_ie_node_id_to_str_c(OTC_SELECT, &peer->remote_node_id));
+		LOGPFSML(fi, LOGL_NOTICE, "Peer released\n");
 }
 
 static void up_peer_graceful_release_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
@@ -470,6 +476,7 @@ static const struct osmo_fsm_state up_peer_fsm_states[] = {
 			| S(UP_PEER_ST_GRACEFUL_RELEASE)
 			| S(UP_PEER_ST_WAIT_USE_COUNT)
 			,
+		.onenter = up_peer_associated_onenter,
 		.action = up_peer_associated_action,
 		.onleave = up_peer_associated_onleave,
 	},

src/osmo-upf/up_session.c

@@ -84,6 +84,7 @@ static const struct osmo_tdef_state_timeout up_session_fsm_timeouts[32] = {
 
 static int up_session_fsm_timer_cb(struct osmo_fsm_inst *fi)
 {
+	//struct up_session *up_session = fi->priv;
 	/* Return 1 to terminate FSM instance, 0 to keep running */
 	return 1;
 }
@@ -141,8 +142,7 @@ static enum osmo_pfcp_cause up_session_choose_f_teid(struct up_session *session,
 		}
 		LOGPFSML(session->fi, LOGL_INFO, "Allocated new local TEID 0x%x\n", dst->fixed.teid);
 
-		if (osmo_pfcp_ip_addrs_set(&dst->fixed.ip_addr,
-					   osmo_pfcp_endpoint_get_local_addr(up_ep->pfcp_ep))) {
+		if (osmo_pfcp_ip_addrs_set(&dst->fixed.ip_addr, &up_ep->pfcp_ep->cfg.local_addr)) {
 			LOGPFSML(session->fi, LOGL_ERROR, "Invalid local address in pfcp_endpoint cfg\n");
 			return OSMO_PFCP_CAUSE_PFCP_ENTITY_IN_CONGESTION;
 		}
@@ -551,8 +551,7 @@ static void up_session_est(struct up_session *session, struct osmo_pfcp_msg *m)
 		goto nack_response;
 
 	/* Success, send ACK */
-	osmo_pfcp_ie_f_seid_set(&resp->up_f_seid, session->up_seid,
-				osmo_pfcp_endpoint_get_local_addr(peer->up_endpoint->pfcp_ep));
+	osmo_pfcp_ie_f_seid_set(&resp->up_f_seid, session->up_seid, &peer->up_endpoint->pfcp_ep->cfg.local_addr);
 	resp->up_f_seid_present = true;
 
 	rc = osmo_pfcp_endpoint_tx(peer->up_endpoint->pfcp_ep, tx);
@@ -833,6 +832,8 @@ static const struct osmo_fsm_state up_session_fsm_states[] = {
 		.in_event_mask = 0
 			| S(UP_SESSION_EV_USE_COUNT_ZERO)
 			,
+		.out_state_mask = 0
+			,
 		.onenter = up_session_wait_use_count_onenter,
 		.action = up_session_wait_use_count_action,
 	},
@@ -872,7 +873,7 @@ static int up_session_use_cb(struct osmo_use_count_entry *e, int32_t old_use_cou
 
 	LOGPFSMSLSRC(session->fi, DREF, level, file, line,
 		     "%s %s: now used by %s\n",
-		     (e->count - old_use_count) > 0 ? "+" : "-", e->use,
+		     (e->count - old_use_count) > 0? "+" : "-", e->use,
 		     osmo_use_count_to_str_c(OTC_SELECT, &session->use_count));
 
 	if (e->count < 0)

src/osmo-upf/upf.c

@@ -77,7 +77,7 @@ int upf_pfcp_listen()
 	osmo_sockaddr_str_to_sockaddr(&local_addr_str, &local_addr.u.sas);
 	LOGP(DLPFCP, LOGL_NOTICE, "PFCP: Listening on %s\n", osmo_sockaddr_to_str_c(OTC_SELECT, &local_addr));
 
-	g_upf->pfcp.ep = up_endpoint_init(g_upf, &local_addr);
+	g_upf->pfcp.ep = up_endpoint_init(g_upf, &local_addr);;
 	if (!g_upf->pfcp.ep) {
 		fprintf(stderr, "Failed to allocate PFCP endpoint.\n");
 		return -1;

src/osmo-upf/upf_gtp.c

@@ -96,8 +96,6 @@ static int upf_gtp_dev_delete(struct upf_gtp_dev *dev)
 
 static int upf_gtp_dev_destruct(struct upf_gtp_dev *dev);
 
-/* Allocate state for one GTP device, add to g_upf->gtp.devs and return the created device. If state for the device of
- * that name already exists, do nothing and return NULL. */
 static struct upf_gtp_dev *upf_gtp_dev_alloc(const char *name, const char *local_addr)
 {
 	struct upf_gtp_dev *dev = upf_gtp_dev_find_by_name(name);
@@ -160,7 +158,7 @@ static int dev_resolve_ifidx(struct upf_gtp_dev *dev)
 
 int upf_gtp_dev_open(const char *name, bool create_gtp_dev, const char *local_addr, bool listen_for_gtpv0, bool sgsn_mode)
 {
-	const struct osmo_sockaddr any = {
+	struct osmo_sockaddr any = {
 		.u.sin = {
 			.sin_family = AF_INET,
 			.sin_port = 0,
@@ -170,14 +168,7 @@ int upf_gtp_dev_open(const char *name, bool create_gtp_dev, const char *local_ad
 		},
 	};
 	int rc;
-	struct upf_gtp_dev *dev;
-
-	if (g_upf->gtp.mockup) {
-		LOGP(DGTP, LOGL_NOTICE, "gtp/mockup active: not opening GTP device '%s'\n", name);
-		return 0;
-	}
-
-	dev = upf_gtp_dev_alloc(name, local_addr);
+	struct upf_gtp_dev *dev = upf_gtp_dev_alloc(name, local_addr);
 	if (!dev)
 		return -EIO;
 
@@ -257,16 +248,9 @@ void upf_gtp_genl_close()
 /* Open an MNL socket which allows to create and remove GTP devices (requires CAP_NET_ADMIN). */
 int upf_gtp_genl_open()
 {
-	if (g_upf->gtp.mockup) {
-		LOGP(DGTP, LOGL_NOTICE, "gtp/mockup active: not opening mnl_socket\n");
-		return 0;
-	}
-
-	/* Already open? */
 	if (g_upf->gtp.nl && g_upf->gtp.genl_id >= 0)
 		return 0;
 
-	/* sanity / paranoia: if re-opening, make sure the previous socket is closed */
 	if (g_upf->gtp.nl)
 		upf_gtp_genl_close();
 
@@ -449,7 +433,6 @@ static int upf_gtp_dev_destruct(struct upf_gtp_dev *dev)
 	while ((t = llist_first_entry_or_null(&dev->tunnels, struct upf_gtp_tun, entry)))
 		talloc_free(t);
 	llist_del(&dev->entry);
-	/* osmo_fd_close() is a noop if ofd.fd == -1 */
 	osmo_fd_close(&dev->gtpv0.ofd);
 	osmo_fd_close(&dev->gtpv1.ofd);
 	if (dev->created)
@@ -459,8 +442,6 @@ static int upf_gtp_dev_destruct(struct upf_gtp_dev *dev)
 
 int upf_gtp_tun_desc_cmp(const struct upf_gtp_tun_desc *a, const struct upf_gtp_tun_desc *b)
 {
-	int r;
-
 	if (a == b)
 		return 0;
 	if (!a)
@@ -468,10 +449,13 @@ int upf_gtp_tun_desc_cmp(const struct upf_gtp_tun_desc *a, const struct upf_gtp_
 	if (!b)
 		return 1;
 
-#define CMP_MEMB(MEMB) OSMO_CMP(a->MEMB, b->MEMB)
-	if ((r = CMP_MEMB(local_teid)))
-		return r;
-	if ((r = CMP_MEMB(remote_teid)))
-		return r;
+#define CMP_RET(MEMB) do { \
+		int _cmp = OSMO_CMP(a->MEMB, b->MEMB); \
+		if (_cmp) \
+			return _cmp; \
+	} while (0)
+
+	CMP_RET(local_teid);
+	CMP_RET(remote_teid);
 	return osmo_sockaddr_cmp(&a->gtp_remote_addr, &b->gtp_remote_addr);
 }

src/osmo-upf/upf_gtpu_echo.c

@@ -47,26 +47,19 @@ struct gtp1u_hdr {
 	uint8_t data2[0];
 } __attribute__((packed));
 
-static int tx_echo_resp(struct upf_gtp_dev *dev, const struct osmo_sockaddr *remote, uint16_t seq_nr);
-
 static int rx_echo_req(struct upf_gtp_dev *dev, const struct osmo_sockaddr *remote, const struct gtp1u_hdr *rx_h)
-{
-	if (!rx_h->s) {
-		LOG_GTP_DEV(dev, LOGL_ERROR, "rx GTPv1-U ECHO REQ without sequence nr\n");
-		return -1;
-	}
-
-	return tx_echo_resp(dev, remote, rx_h->ext.seq_nr);
-}
-
-static int tx_echo_resp(struct upf_gtp_dev *dev, const struct osmo_sockaddr *remote, uint16_t seq_nr)
 {
 	struct msgb *msg;
 	struct gtp1u_hdr *tx_h;
 	int rc;
 
+	if (!rx_h->s) {
+		LOG_GTP_DEV(dev, LOGL_ERROR, "rx GTPv1-U ECHO REQ without sequence nr\n");
+		return -1;
+	}
+
 	msg = msgb_alloc_headroom(1024, 128, "GTP-echo-resp");
-	tx_h = (void *)msgb_put(msg, sizeof(*tx_h));
+	tx_h = (void*)msgb_put(msg, sizeof(*tx_h));
 
 	*tx_h = (struct gtp1u_hdr){
 		/* 3GPP TS 29.281 5.1 defines that the ECHO REQ & RESP shall contain a sequence nr */
@@ -75,7 +68,7 @@ static int tx_echo_resp(struct upf_gtp_dev *dev, const struct osmo_sockaddr *rem
 		.version = 1,
 		.msg_type = GTP1U_MSGTYPE_ECHO_RSP,
 		.ext = {
-			.seq_nr = seq_nr,
+			.seq_nr = rx_h->ext.seq_nr,
 		},
 	};
 

src/osmo-upf/upf_nft.c

@@ -38,12 +38,6 @@ static char *upf_nft_ruleset_table_create(void *ctx, const char *table_name)
 static int upf_nft_run(const char *ruleset)
 {
 	int rc;
-
-	if (g_upf->nft.mockup) {
-		LOGP(DNFT, LOGL_NOTICE, "nft/mockup active: not running nft ruleset: '%s'\n", ruleset);
-		return 0;
-	}
-
 	if (!g_upf->nft.nft_ctx) {
 		rc = upf_nft_init();
 		if (rc)
@@ -62,12 +56,6 @@ static int upf_nft_run(const char *ruleset)
 int upf_nft_init()
 {
 	int rc;
-	if (g_upf->nft.mockup) {
-		LOGP(DNFT, LOGL_NOTICE,
-		     "nft/mockup active: not allocating libnftables nft_ctx. FOR TESTING PURPOSES ONLY.\n");
-		return 0;
-	}
-
 	g_upf->nft.nft_ctx = nft_ctx_new(NFT_CTX_DEFAULT);
 	if (!g_upf->nft.nft_ctx) {
 		LOGP(DNFT, LOGL_ERROR, "cannot allocate libnftables nft_ctx\n");

src/osmo-upf/upf_vty.c

@@ -86,7 +86,7 @@ static struct cmd_node cfg_gtp_node = {
 
 DEFUN(cfg_gtp, cfg_gtp_cmd,
       "gtp",
-      "Enter the 'gtp' node to configure Linux GTP kernel module usage\n")
+      "Enter the 'gtp' node to configure GTP kernel module usage\n")
 {
 	vty->node = GTP_NODE;
 	return CMD_SUCCESS;
@@ -97,9 +97,6 @@ static int config_write_gtp(struct vty *vty)
 	struct gtp_vty_cfg_dev *d;
 	vty_out(vty, "gtp%s", VTY_NEWLINE);
 
-	if (g_upf->gtp.mockup)
-		vty_out(vty, " mockup%s", VTY_NEWLINE);
-
 	llist_for_each_entry(d, &gtp_vty.devs, entry) {
 		if (d->create) {
 			vty_out(vty, " dev create %s", d->dev_name);
@@ -115,28 +112,10 @@ static int config_write_gtp(struct vty *vty)
 
 #define DEV_STR "Configure the GTP device to use for encaps/decaps.\n"
 
-DEFUN(cfg_gtp_mockup, cfg_gtp_mockup_cmd,
-      "mockup",
-      "don't actually send commands to the GTP kernel module, just return success\n")
-{
-	g_upf->gtp.mockup = true;
-	return CMD_SUCCESS;
-}
-
-DEFUN(cfg_gtp_no_mockup, cfg_gtp_no_mockup_cmd,
-      "no mockup",
-      NO_STR
-      "operate GTP kernel module normally\n")
-{
-	g_upf->gtp.mockup = false;
-	return CMD_SUCCESS;
-}
-
 DEFUN(cfg_gtp_dev_create, cfg_gtp_dev_create_cmd,
       "dev create DEVNAME [LISTEN_ADDR]",
       DEV_STR
-      "Add GTP device, creating a new Linux kernel GTP device. Will listen on GTPv1 port "
-      OSMO_STRINGIFY_VAL(PORT_GTP1_U)
+      "create a new GTP device. Will listen on GTPv1 port " OSMO_STRINGIFY_VAL(PORT_GTP1_U)
       " and GTPv0 port " OSMO_STRINGIFY_VAL(PORT_GTP0_U) " on the specified interface, or on ANY if LISTEN_ADDR is"
       " omitted.\n"
       "device name, e.g. 'apn0'\n"
@@ -155,7 +134,7 @@ DEFUN(cfg_gtp_dev_create, cfg_gtp_dev_create_cmd,
 DEFUN(cfg_gtp_dev_use, cfg_gtp_dev_use_cmd,
       "dev use DEVNAME",
       DEV_STR
-      "Add GTP device, using an existing Linux kernel GTP device, e.g. created by 'gtp-link'\n"
+      "use an existing GTP device, e.g. created by 'gtp-link'\n"
       "device name, e.g. 'apn0'\n")
 {
 	struct gtp_vty_cfg_dev *d = talloc_zero(g_upf, struct gtp_vty_cfg_dev);
@@ -169,7 +148,7 @@ DEFUN(cfg_gtp_dev_use, cfg_gtp_dev_use_cmd,
 DEFUN(cfg_gtp_dev_del, cfg_gtp_dev_del_cmd,
       "dev delete DEVNAME",
       DEV_STR
-      "Remove a GTP device from the configuration, and delete the Linux kernel GTP device if it was created here.\n"
+      "Remove a GTP device from the configuration, and delete the device if it was created here.\n"
       "device name, e.g. 'apn0'\n")
 {
 	const char *dev_name = argv[0];
@@ -209,31 +188,11 @@ static int config_write_nft(struct vty *vty)
 {
 	vty_out(vty, "nft%s", VTY_NEWLINE);
 
-	if (g_upf->nft.mockup)
-		vty_out(vty, " mockup%s", VTY_NEWLINE);
-
 	if (g_upf->nft.table_name && strcmp(g_upf->nft.table_name, "osmo-upf"))
 		vty_out(vty, " table-name %s%s", g_upf->nft.table_name, VTY_NEWLINE);
 	return CMD_SUCCESS;
 }
 
-DEFUN(cfg_nft_mockup, cfg_nft_mockup_cmd,
-      "mockup",
-      "don't actually send rulesets to nftables, just return success\n")
-{
-	g_upf->nft.mockup = true;
-	return CMD_SUCCESS;
-}
-
-DEFUN(cfg_nft_no_mockup, cfg_nft_no_mockup_cmd,
-      "no mockup",
-      NO_STR
-      "operate nftables rulesets normally\n")
-{
-	g_upf->nft.mockup = false;
-	return CMD_SUCCESS;
-}
-
 DEFUN(cfg_nft_table_name, cfg_nft_table_name_cmd,
       "table-name TABLE_NAME",
       "Set the nft inet table name to create and place GTP tunnel forwarding chains in"
@@ -355,8 +314,6 @@ void upf_vty_init()
 	install_node(&cfg_gtp_node, config_write_gtp);
 	install_element(CONFIG_NODE, &cfg_gtp_cmd);
 
-	install_element(GTP_NODE, &cfg_gtp_mockup_cmd);
-	install_element(GTP_NODE, &cfg_gtp_no_mockup_cmd);
 	install_element(GTP_NODE, &cfg_gtp_dev_create_cmd);
 	install_element(GTP_NODE, &cfg_gtp_dev_use_cmd);
 	install_element(GTP_NODE, &cfg_gtp_dev_del_cmd);
@@ -364,7 +321,6 @@ void upf_vty_init()
 	install_node(&cfg_nft_node, config_write_nft);
 	install_element(CONFIG_NODE, &cfg_nft_cmd);
 
-	install_element(NFT_NODE, &cfg_nft_mockup_cmd);
-	install_element(NFT_NODE, &cfg_nft_no_mockup_cmd);
 	install_element(NFT_NODE, &cfg_nft_table_name_cmd);
 }
+

tests/Makefile.am

@@ -1,3 +1,8 @@
+SUBDIRS = \
+	libosmo-gtlv \
+	libosmo-pfcp \
+	$(NULL)
+
 # The `:;' works around a Bash 3.2 bug when the output is not writeable.
 $(srcdir)/package.m4: $(top_srcdir)/configure.ac
 	:;{ \
@@ -48,7 +53,7 @@ VTY_TEST ?= *.vty
 vty-test:
 	osmo_verify_transcript_vty.py -v \
 		-n OsmoUPF -p 4275 \
-		-r "$(top_builddir)/src/osmo-upf/osmo-upf -c $(top_srcdir)/doc/examples/osmo-upf/osmo-upf-mockup.cfg" \
+		-r "$(top_builddir)/src/osmo-upf/osmo-upf -c $(top_srcdir)/doc/examples/osmo-upf/osmo-upf.cfg" \
 		$(U) $(srcdir)/$(VTY_TEST)
 
 check-local: atconfig $(TESTSUITE)

tests/libosmo-gtlv/Makefile.am

@@ -0,0 +1,49 @@
+SUBDIRS = \
+	test_gtlv_gen \
+	test_tliv \
+	$(NULL)
+
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	gtlv_test \
+	gtlv_dec_enc_test \
+	$(NULL)
+
+EXTRA_DIST = \
+	gtlv_test.ok \
+	gtlv_dec_enc_test.ok \
+	$(NULL)
+
+gtlv_test_SOURCES = \
+	gtlv_test.c \
+	$(NULL)
+
+gtlv_test_LDADD = \
+	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(NULL)
+
+gtlv_dec_enc_test_SOURCES = \
+	gtlv_dec_enc_test.c \
+	$(NULL)
+
+gtlv_dec_enc_test_LDADD = \
+	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(NULL)
+
+.PHONY: update_exp
+update_exp:
+	$(builddir)/gtlv_test >$(srcdir)/gtlv_test.ok
+	$(builddir)/gtlv_dec_enc_test >$(srcdir)/gtlv_dec_enc_test.ok
+	$(MAKE) -C test_gtlv_gen update_exp
+	$(MAKE) -C test_tliv update_exp

tests/libosmo-gtlv/gtlv_dec_enc_test.c

@@ -0,0 +1,422 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <assert.h>
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
+
+#include <osmocom/gtlv/gtlv_dec_enc.h>
+
+void *ctx;
+
+enum tags {
+	TAG_FOO = 1,
+	TAG_BAR,
+	TAG_BAZ,
+	TAG_REPEAT_INT,
+	TAG_REPEAT_STRUCT,
+	TAG_NEST,
+};
+
+const struct value_string tag_names[] = {
+	{ TAG_FOO, "FOO" },
+	{ TAG_BAR, "BAR" },
+	{ TAG_BAZ, "BAZ" },
+	{ TAG_REPEAT_INT, "REPEAT_INT" },
+	{ TAG_REPEAT_STRUCT, "REPEAT_STRUCT" },
+	{ TAG_NEST, "NEST" },
+	{}
+};
+
+struct bar {
+	char str[23];
+};
+
+struct baz {
+	int v_int;
+	bool v_bool;
+};
+
+enum repeat_enum {
+	R_A,
+	R_B,
+	R_C,
+};
+
+const struct value_string repeat_enum_names[] = {
+	OSMO_VALUE_STRING(R_A),
+	OSMO_VALUE_STRING(R_B),
+	OSMO_VALUE_STRING(R_C),
+	{}
+};
+
+struct repeat {
+	int v_int;
+	bool v_bool;
+	enum repeat_enum v_enum;
+};
+
+struct nested_inner_msg {
+	int foo;
+	struct bar bar;
+	struct baz baz;
+};
+
+struct decoded_msg {
+	int foo;
+	struct bar bar;
+
+	bool baz_present;
+	struct baz baz;
+
+	unsigned int repeat_int_count;
+	int repeat_int[32];
+
+	unsigned int repeat_struct_count;
+	struct repeat repeat_struct[32];
+
+	bool nest_present;
+	struct nested_inner_msg nest;
+};
+
+int dec_u16(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv)
+{
+	int *foo = decode_to;
+	if (gtlv->len != 2)
+		return -EINVAL;
+	*foo = osmo_load16be(gtlv->val);
+	return 0;
+}
+
+int enc_u16(struct osmo_gtlv_put *gtlv, const void *decoded_struct, const void *encode_from)
+{
+	const int *foo = encode_from;
+	if (*foo > INT16_MAX)
+		return -EINVAL;
+	msgb_put_u16(gtlv->dst, *foo);
+	return 0;
+}
+
+int enc_to_str_u16(char *buf, size_t buflen, const void *encode_from)
+{
+	const int *foo = encode_from;
+	return snprintf(buf, buflen, "%d", *foo);
+}
+
+int dec_bar(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv)
+{
+	struct bar *bar = decode_to;
+	if (gtlv->len > sizeof(bar->str) - 1)
+		return -EINVAL;
+	osmo_strlcpy(bar->str, (const char *)gtlv->val, OSMO_MIN(gtlv->len + 1, sizeof(bar->str)));
+	return 0;
+}
+
+int enc_bar(struct osmo_gtlv_put *gtlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct bar *bar = encode_from;
+	int len = strnlen(bar->str, sizeof(bar->str));
+	memcpy(msgb_put(gtlv->dst, len), bar, len);
+	return 0;
+}
+
+int enc_to_str_bar(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct bar *bar = encode_from;
+	return osmo_quote_str_buf3(buf, buflen, bar->str, -1);
+}
+
+int dec_baz(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv)
+{
+	struct baz *baz = decode_to;
+	uint16_t l;
+	if (gtlv->len != 2)
+		return -EINVAL;
+	l = osmo_load16be(gtlv->val);
+	baz->v_int = l & 0x7fff;
+	baz->v_bool = (l & 0x8000) ? true : false;
+	return 0;
+}
+
+int enc_baz(struct osmo_gtlv_put *gtlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct baz *baz = encode_from;
+	if (baz->v_int > 0x7fff)
+		return -EINVAL;
+	msgb_put_u16(gtlv->dst, (baz->v_bool ? 0x8000 : 0) + (baz->v_int & 0x7fff));
+	return 0;
+}
+
+int enc_to_str_baz(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct baz *baz = encode_from;
+	return snprintf(buf, buflen, "{%d,%s}", baz->v_int, baz->v_bool ? "true" : "false");
+}
+
+int dec_repeat_struct(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv)
+{
+	struct repeat *repeat_struct = decode_to;
+	if (gtlv->len != 3)
+		return -EINVAL;
+	repeat_struct->v_int = osmo_load16be(gtlv->val);
+	repeat_struct->v_bool = gtlv->val[2] & 0x80;
+	repeat_struct->v_enum = gtlv->val[2] & 0x7f;
+	return 0;
+}
+
+int enc_repeat_struct(struct osmo_gtlv_put *gtlv, const void *decoded_struct, const void *encode_from)
+{
+	const struct repeat *repeat_struct = encode_from;
+	msgb_put_u16(gtlv->dst, repeat_struct->v_int);
+	msgb_put_u8(gtlv->dst, (repeat_struct->v_bool ? 0x80 : 0) + (repeat_struct->v_enum & 0x7f));
+	return 0;
+}
+
+int enc_to_str_repeat_struct(char *buf, size_t buflen, const void *encode_from)
+{
+	const struct repeat *repeat_struct = encode_from;
+	return snprintf(buf, buflen, "{%d,%s,%s}", repeat_struct->v_int, repeat_struct->v_bool ? "true" : "false",
+			get_value_string(repeat_enum_names, repeat_struct->v_enum));
+}
+
+struct osmo_gtlv_coding nested_inner_msg_ies[] = {
+	{
+		.ti = { TAG_FOO },
+		.dec_func = dec_u16,
+		.enc_func = enc_u16,
+		.enc_to_str_func = enc_to_str_u16,
+		.memb_ofs = offsetof(struct nested_inner_msg, foo),
+	},
+	{
+		.ti = { TAG_BAR },
+		.dec_func = dec_bar,
+		.enc_func = enc_bar,
+		.enc_to_str_func = enc_to_str_bar,
+		.memb_ofs = offsetof(struct nested_inner_msg, bar),
+	},
+	{
+		.ti = { TAG_BAZ },
+		.dec_func = dec_baz,
+		.enc_func = enc_baz,
+		.enc_to_str_func = enc_to_str_baz,
+		.memb_ofs = offsetof(struct nested_inner_msg, baz),
+	},
+	{}
+};
+
+struct osmo_gtlv_coding msg_ie_coding[] = {
+	{
+		.ti = { TAG_FOO },
+		.dec_func = dec_u16,
+		.enc_func = enc_u16,
+		.enc_to_str_func = enc_to_str_u16,
+		.memb_ofs = offsetof(struct decoded_msg, foo),
+	},
+	{
+		.ti = { TAG_BAR },
+		.dec_func = dec_bar,
+		.enc_func = enc_bar,
+		.enc_to_str_func = enc_to_str_bar,
+		.memb_ofs = offsetof(struct decoded_msg, bar),
+	},
+	{
+		.ti = { TAG_BAZ },
+		.dec_func = dec_baz,
+		.enc_func = enc_baz,
+		.enc_to_str_func = enc_to_str_baz,
+		.memb_ofs = offsetof(struct decoded_msg, baz),
+		.has_presence_flag = true,
+		.presence_flag_ofs = offsetof(struct decoded_msg, baz_present),
+	},
+	{
+		.ti = { TAG_REPEAT_INT },
+		.dec_func = dec_u16,
+		.enc_func = enc_u16,
+		.enc_to_str_func = enc_to_str_u16,
+		.memb_ofs = offsetof(struct decoded_msg, repeat_int),
+		.memb_array_pitch = OSMO_MEMB_ARRAY_PITCH(struct decoded_msg, repeat_int),
+		.has_count = true,
+		.count_ofs = offsetof(struct decoded_msg, repeat_int_count),
+		.count_max = ARRAY_SIZE(((struct decoded_msg *)0)->repeat_int),
+	},
+	{
+		.ti = { TAG_REPEAT_STRUCT },
+		.dec_func = dec_repeat_struct,
+		.enc_func = enc_repeat_struct,
+		.enc_to_str_func = enc_to_str_repeat_struct,
+		.memb_ofs = offsetof(struct decoded_msg, repeat_struct),
+		.memb_array_pitch = OSMO_MEMB_ARRAY_PITCH(struct decoded_msg, repeat_struct),
+		.has_count = true,
+		.count_ofs = offsetof(struct decoded_msg, repeat_struct_count),
+		.count_max = ARRAY_SIZE(((struct decoded_msg *)0)->repeat_struct),
+	},
+	{
+		.ti = { TAG_NEST },
+		.memb_ofs = offsetof(struct decoded_msg, nest),
+		.nested_ies = nested_inner_msg_ies,
+		.has_presence_flag = true,
+		.presence_flag_ofs = offsetof(struct decoded_msg, nest_present),
+	},
+	{}
+};
+
+char *decoded_msg_to_str(const struct decoded_msg *m)
+{
+	return osmo_gtlvs_encode_to_str_c(ctx, m, 0, msg_ie_coding, tag_names);
+}
+
+
+const struct decoded_msg enc_dec_tests[] = {
+	{
+		.foo = 23,
+		.bar = { "twentythree" },
+	},
+	{
+		.foo = 23,
+		.bar = { "twentythree" },
+
+		.baz_present = true,
+		.baz = {
+			.v_int = 2323,
+			.v_bool = true,
+		},
+	},
+	{
+		.foo = 23,
+		.bar = { "twentythree" },
+
+		.baz_present = true,
+		.baz = {
+			.v_int = 2323,
+			.v_bool = true,
+		},
+
+		.repeat_int_count = 3,
+		.repeat_int = { 1, 2, 0x7fff },
+	},
+	{
+		.foo = 23,
+		.bar = { "twentythree" },
+
+		.baz_present = true,
+		.baz = {
+			.v_int = 2323,
+			.v_bool = true,
+		},
+
+		.repeat_int_count = 3,
+		.repeat_int = { 1, 2, 0x7fff },
+
+		.repeat_struct_count = 2,
+		.repeat_struct = {
+			{
+				.v_int = 1001,
+				.v_bool = true,
+				.v_enum = R_A,
+			},
+			{
+				.v_int = 1002,
+				.v_bool = false,
+				.v_enum = R_B,
+			},
+		},
+
+		.nest_present = true,
+		.nest = {
+			.foo = 42,
+			.bar = { "fortytwo" },
+			.baz = {
+				.v_int = 4242,
+				.v_bool = false,
+			},
+		},
+	},
+};
+
+static int verify_err_cb_data;
+
+void err_cb(void *data, void *decoded_struct, const char *file, int line, const char *fmt, ...)
+{
+	assert(data == &verify_err_cb_data);
+	va_list args;
+	va_start(args, fmt);
+	//printf("ERR: %s:%d ", file, line);
+	printf("ERR: ");
+	vprintf(fmt, args);
+	va_end(args);
+}
+
+void test_enc_dec(const char *label, const struct osmo_gtlv_cfg *cfg, bool ordered)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(enc_dec_tests); i++) {
+		int rc;
+		const struct decoded_msg *orig = &enc_dec_tests[i];
+		struct decoded_msg parsed = {};
+		struct osmo_gtlv_load load;
+		struct osmo_gtlv_put put;
+
+		printf("\n=== start %s %s[%d]\n", label, __func__, i);
+		printf("encoded: %s\n", decoded_msg_to_str(orig));
+
+		put = (struct osmo_gtlv_put){
+			.cfg = cfg,
+			.dst = msgb_alloc(1024, __func__),
+		};
+		rc = osmo_gtlvs_encode(&put, (void *)orig, 0, msg_ie_coding, err_cb, &verify_err_cb_data, tag_names);
+		printf("osmo_gtlvs_encode() rc = %d\n", rc);
+		printf("%s.\n", osmo_hexdump(put.dst->data, put.dst->len));
+
+		load = (struct osmo_gtlv_load){
+			.cfg = cfg,
+			.src = { put.dst->data, put.dst->len },
+		};
+		rc = osmo_gtlvs_decode(&parsed, 0, &load, ordered, msg_ie_coding, err_cb, &verify_err_cb_data, tag_names);
+		printf("osmo_gtlvs_decode() rc = %d\n", rc);
+		printf("decoded: %s\n", decoded_msg_to_str(&parsed));
+		if (strcmp(decoded_msg_to_str(orig), decoded_msg_to_str(&parsed))) {
+			printf(" ERROR: parsed != orig\n");
+			exit(1);
+		}
+		printf("=== end %s %s[%d]\n", label, __func__, i);
+	}
+}
+
+int main()
+{
+	ctx = talloc_named_const(NULL, 0, "gtlv_test");
+	msgb_talloc_ctx_init(ctx, 0);
+
+	test_enc_dec("t8l8v ordered", &osmo_t8l8v_cfg, true);
+	test_enc_dec("t8l8v unordered", &osmo_t8l8v_cfg, false);
+
+	test_enc_dec("t16l16v ordered", &osmo_t16l16v_cfg, true);
+	test_enc_dec("t16l16v unordered", &osmo_t16l16v_cfg, false);
+
+	talloc_free(ctx);
+	return 0;
+}

tests/libosmo-gtlv/gtlv_dec_enc_test.ok

@@ -0,0 +1,128 @@
+
+=== start t8l8v ordered test_enc_dec[0]
+encoded:  'FOO'=23 'BAR'="twentythree"
+osmo_gtlvs_encode() rc = 0
+01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree"
+=== end t8l8v ordered test_enc_dec[0]
+
+=== start t8l8v ordered test_enc_dec[1]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true}
+osmo_gtlvs_encode() rc = 0
+01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true}
+=== end t8l8v ordered test_enc_dec[1]
+
+=== start t8l8v ordered test_enc_dec[2]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 }
+osmo_gtlvs_encode() rc = 0
+01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 04 02 00 01 04 02 00 02 04 02 7f ff .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 }
+=== end t8l8v ordered test_enc_dec[2]
+
+=== start t8l8v ordered test_enc_dec[3]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} }
+osmo_gtlvs_encode() rc = 0
+01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 04 02 00 01 04 02 00 02 04 02 7f ff 05 03 03 e9 80 05 03 03 ea 01 06 12 01 02 00 2a 02 08 66 6f 72 74 79 74 77 6f 03 02 10 92 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} }
+=== end t8l8v ordered test_enc_dec[3]
+
+=== start t8l8v unordered test_enc_dec[0]
+encoded:  'FOO'=23 'BAR'="twentythree"
+osmo_gtlvs_encode() rc = 0
+01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree"
+=== end t8l8v unordered test_enc_dec[0]
+
+=== start t8l8v unordered test_enc_dec[1]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true}
+osmo_gtlvs_encode() rc = 0
+01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true}
+=== end t8l8v unordered test_enc_dec[1]
+
+=== start t8l8v unordered test_enc_dec[2]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 }
+osmo_gtlvs_encode() rc = 0
+01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 04 02 00 01 04 02 00 02 04 02 7f ff .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 }
+=== end t8l8v unordered test_enc_dec[2]
+
+=== start t8l8v unordered test_enc_dec[3]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} }
+osmo_gtlvs_encode() rc = 0
+01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 04 02 00 01 04 02 00 02 04 02 7f ff 05 03 03 e9 80 05 03 03 ea 01 06 12 01 02 00 2a 02 08 66 6f 72 74 79 74 77 6f 03 02 10 92 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} }
+=== end t8l8v unordered test_enc_dec[3]
+
+=== start t16l16v ordered test_enc_dec[0]
+encoded:  'FOO'=23 'BAR'="twentythree"
+osmo_gtlvs_encode() rc = 0
+00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree"
+=== end t16l16v ordered test_enc_dec[0]
+
+=== start t16l16v ordered test_enc_dec[1]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true}
+osmo_gtlvs_encode() rc = 0
+00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true}
+=== end t16l16v ordered test_enc_dec[1]
+
+=== start t16l16v ordered test_enc_dec[2]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 }
+osmo_gtlvs_encode() rc = 0
+00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 00 04 00 02 00 01 00 04 00 02 00 02 00 04 00 02 7f ff .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 }
+=== end t16l16v ordered test_enc_dec[2]
+
+=== start t16l16v ordered test_enc_dec[3]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} }
+osmo_gtlvs_encode() rc = 0
+00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 00 04 00 02 00 01 00 04 00 02 00 02 00 04 00 02 7f ff 00 05 00 03 03 e9 80 00 05 00 03 03 ea 01 00 06 00 18 00 01 00 02 00 2a 00 02 00 08 66 6f 72 74 79 74 77 6f 00 03 00 02 10 92 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} }
+=== end t16l16v ordered test_enc_dec[3]
+
+=== start t16l16v unordered test_enc_dec[0]
+encoded:  'FOO'=23 'BAR'="twentythree"
+osmo_gtlvs_encode() rc = 0
+00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree"
+=== end t16l16v unordered test_enc_dec[0]
+
+=== start t16l16v unordered test_enc_dec[1]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true}
+osmo_gtlvs_encode() rc = 0
+00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true}
+=== end t16l16v unordered test_enc_dec[1]
+
+=== start t16l16v unordered test_enc_dec[2]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 }
+osmo_gtlvs_encode() rc = 0
+00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 00 04 00 02 00 01 00 04 00 02 00 02 00 04 00 02 7f ff .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 }
+=== end t16l16v unordered test_enc_dec[2]
+
+=== start t16l16v unordered test_enc_dec[3]
+encoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} }
+osmo_gtlvs_encode() rc = 0
+00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 00 04 00 02 00 01 00 04 00 02 00 02 00 04 00 02 7f ff 00 05 00 03 03 e9 80 00 05 00 03 03 ea 01 00 06 00 18 00 01 00 02 00 2a 00 02 00 08 66 6f 72 74 79 74 77 6f 00 03 00 02 10 92 .
+osmo_gtlvs_decode() rc = 0
+decoded:  'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} }
+=== end t16l16v unordered test_enc_dec[3]

tests/libosmo-gtlv/gtlv_test.c

@@ -0,0 +1,629 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
+
+#include <osmocom/gtlv/gtlv.h>
+
+void *ctx;
+
+struct ie {
+	struct osmo_gtlv_tag_inst ti;
+	const char *val;
+};
+
+/* write all IEs to a msgb */
+struct msgb *test_tlv_enc(const struct osmo_gtlv_cfg *cfg, const struct ie *ies)
+{
+	const struct ie *ie;
+	struct osmo_gtlv_put gtlv = {
+		.cfg = cfg,
+		.dst = msgb_alloc(1024, __func__),
+	};
+
+	for (ie = ies; ie->val; ie++) {
+		/* put header without knowing length yet */
+		OSMO_ASSERT(osmo_gtlv_put_tli(&gtlv, &ie->ti, 0) == 0);
+		/* put value data, as much as desired */
+		msgb_put(gtlv.dst, osmo_hexparse(ie->val, gtlv.dst->tail, msgb_tailroom(gtlv.dst)));
+		/* update header len from amount of written data */
+		OSMO_ASSERT(osmo_gtlv_put_update_tl(&gtlv) == 0);
+	}
+
+	printf("- encoded: %s.\n", osmo_hexdump(gtlv.dst->data, gtlv.dst->len));
+	return gtlv.dst;
+}
+
+/* read all IEs from the msgb, and verify that it matches the given list of IEs */
+void test_tlv_dec(const struct osmo_gtlv_cfg *cfg, const struct ie *ies, struct msgb *msg)
+{
+	const struct ie *ie;
+	struct osmo_gtlv_load gtlv = {
+		.cfg = cfg,
+		.src = { msg->data, msg->len },
+	};
+
+	printf("- decoding:\n");
+	osmo_gtlv_load_start(&gtlv);
+
+	for (ie = ies; ie->val; ie++) {
+		int rc = osmo_gtlv_load_next(&gtlv);
+		if (rc) {
+			printf("  ERROR loading TLV structure: osmo_gtlv_load_next() rc = %d\n", rc);
+			exit(1);
+		}
+		/* end of TLV structure? */
+		if (!gtlv.val)
+			break;
+		printf("  T=%s L=%zu", osmo_gtlv_tag_inst_to_str_c(ctx, &gtlv.ti, NULL), gtlv.len);
+		printf(" v=%s\n", osmo_hexdump_nospc(gtlv.val, gtlv.len));
+		if (gtlv.ti.tag != ie->ti.tag) {
+			printf("  ERROR loading TLV structure: expected tag %u, got tag %u\n", ie->ti.tag, gtlv.ti.tag);
+			exit(1);
+		}
+		if (strcmp(ie->val, osmo_hexdump_nospc(gtlv.val, gtlv.len))) {
+			printf("  ERROR loading TLV structure: expected val %s, got val %s\n", ie->val,
+			       osmo_hexdump_nospc(gtlv.val, gtlv.len));
+			exit(1);
+		}
+	}
+}
+
+void test_tlv_peek(const struct osmo_gtlv_cfg *cfg, const struct ie *ies, struct msgb *msg)
+{
+	const struct ie *ie;
+	struct osmo_gtlv_load gtlv = {
+		.cfg = cfg,
+		.src = { msg->data, msg->len },
+	};
+
+	printf("- peeking:\n");
+	osmo_gtlv_load_start(&gtlv);
+
+	ie = ies;
+	while (1) {
+		int rc;
+		struct osmo_gtlv_tag_inst next_tag;
+		rc = osmo_gtlv_load_peek_tag(&gtlv, &next_tag);
+		if (rc == -ENOENT) {
+			printf("  peek rc=-ENOENT\n");
+		} else {
+			printf("  peek T=%s", osmo_gtlv_tag_inst_to_str_c(ctx, &next_tag, NULL));
+			printf("\n");
+		}
+
+		if (ie->val && osmo_gtlv_tag_inst_cmp(&next_tag, &ie->ti)) {
+			printf("  ERROR peeking tag: expected tag %s, got tag %s\n",
+			       osmo_gtlv_tag_inst_to_str_c(ctx, &ie->ti, NULL),
+			       osmo_gtlv_tag_inst_to_str_c(ctx, &next_tag, NULL));
+			exit(1);
+		}
+		if (!ie->val && rc != -ENOENT) {
+			printf("  ERROR peeking tag: expected -ENOENT, got rc=%d, tag %s\n", rc,
+			       osmo_gtlv_tag_inst_to_str_c(ctx, &next_tag, NULL));
+			exit(1);
+		}
+
+		if (rc == -ENOENT)
+			break;
+
+		/* go to the next TLV */
+		rc = osmo_gtlv_load_next(&gtlv);
+		if (rc) {
+			printf("  ERROR loading TLV structure: osmo_gtlv_load_next() rc = %d\n", rc);
+			exit(1);
+		}
+		if (ie->val)
+			ie++;
+	}
+}
+
+/* Decode TLV in random order, each time searching for a tag in the raw data */
+void test_tlv_dec_by_tag(const struct osmo_gtlv_cfg *cfg, const struct ie *ies, struct msgb *msg)
+{
+	const struct ie *last_ie;
+	const struct ie *ie;
+	int rc;
+	struct osmo_gtlv_load gtlv = {
+		.cfg = cfg,
+		.src = { msg->data, msg->len },
+	};
+
+	printf("- decoding in reverse order:\n");
+
+	last_ie = ies;
+	while (last_ie->val) last_ie++;
+	last_ie--;
+
+	for (ie = last_ie; ie >= ies; ie--) {
+		/* each time, look from the beginning */
+		osmo_gtlv_load_start(&gtlv);
+		rc = osmo_gtlv_load_next_by_tag_inst(&gtlv, &ie->ti);
+		if (rc) {
+			printf("  ERROR loading TLV structure: osmo_gtlv_load_next_by_tag_inst(%s) rc = %d\n",
+			       osmo_gtlv_tag_inst_to_str_c(ctx, &ie->ti, NULL), rc);
+			exit(1);
+		}
+		if (!gtlv.val) {
+			printf("  ERROR loading TLV structure: osmo_gtlv_load_next_by_tag_inst(%s) returned NULL val\n",
+			       osmo_gtlv_tag_inst_to_str_c(ctx, &ie->ti, NULL));
+			exit(1);
+		}
+		if (osmo_gtlv_tag_inst_cmp(&gtlv.ti, &ie->ti)) {
+			printf("  ERROR loading TLV structure: expected tag %s, got tag %s\n",
+			       osmo_gtlv_tag_inst_to_str_c(ctx, &ie->ti, NULL),
+			       osmo_gtlv_tag_inst_to_str_c(ctx, &gtlv.ti, NULL));
+			exit(1);
+		}
+		if (strcmp(ie->val, osmo_hexdump_nospc(gtlv.val, gtlv.len))) {
+			while (1) {
+				printf("   (mismatch: T=%s L=%zu v=%s, checking for another occurrence of T=%s)\n",
+				       osmo_gtlv_tag_inst_to_str_c(ctx, &gtlv.ti, NULL),
+				       gtlv.len,
+				       osmo_hexdump_nospc(gtlv.val, gtlv.len),
+				       osmo_gtlv_tag_inst_to_str_c(ctx, &gtlv.ti, NULL));
+
+				rc = osmo_gtlv_load_next_by_tag_inst(&gtlv, &ie->ti);
+				if (rc || !gtlv.val) {
+					printf("  ERROR val not found\n");
+					exit(1);
+				}
+				if (strcmp(ie->val, osmo_hexdump_nospc(gtlv.val, gtlv.len)) == 0) {
+					break;
+				}
+			}
+		}
+		printf("  T=%s L=%zu v=%s\n",
+		       osmo_gtlv_tag_inst_to_str_c(ctx, &gtlv.ti, NULL),
+		       gtlv.len, osmo_hexdump_nospc(gtlv.val, gtlv.len));
+	}
+
+	printf("- decoding every second tag:\n");
+
+	osmo_gtlv_load_start(&gtlv);
+	for (ie = ies; ie->val; ie++) {
+		/* skip one tag */
+		ie++;
+		if (!ie->val)
+			break;
+
+		rc = osmo_gtlv_load_next_by_tag_inst(&gtlv, &ie->ti);
+		if (rc) {
+			printf("  ERROR loading TLV structure: osmo_gtlv_load_next_by_tag_inst(%s) rc = %d\n",
+			       osmo_gtlv_tag_inst_to_str_c(ctx, &ie->ti, NULL), rc);
+			exit(1);
+		}
+		if (!gtlv.val) {
+			printf("  ERROR loading TLV structure: osmo_gtlv_load_next_by_tag_inst(%s) returned NULL val\n",
+			       osmo_gtlv_tag_inst_to_str_c(ctx, &ie->ti, NULL));
+			exit(1);
+		}
+		if (osmo_gtlv_tag_inst_cmp(&gtlv.ti, &ie->ti)) {
+			printf("  ERROR loading TLV structure: expected tag %s, got tag %s\n",
+			       osmo_gtlv_tag_inst_to_str_c(ctx, &ie->ti, NULL),
+			       osmo_gtlv_tag_inst_to_str_c(ctx, &gtlv.ti, NULL));
+			exit(1);
+		}
+		if (strcmp(ie->val, osmo_hexdump_nospc(gtlv.val, gtlv.len))) {
+			while (1) {
+				printf("   (mismatch: T=%s L=%zu v=%s, checking for another occurrence of T=%s)\n",
+				       osmo_gtlv_tag_inst_to_str_c(ctx, &gtlv.ti, NULL),
+				       gtlv.len,
+				       osmo_hexdump_nospc(gtlv.val, gtlv.len),
+				       osmo_gtlv_tag_inst_to_str_c(ctx, &gtlv.ti, NULL));
+
+				rc = osmo_gtlv_load_next_by_tag_inst(&gtlv, &ie->ti);
+				if (rc || !gtlv.val) {
+					printf("  ERROR val not found\n");
+					exit(1);
+				}
+				if (strcmp(ie->val, osmo_hexdump_nospc(gtlv.val, gtlv.len)) == 0) {
+					break;
+				}
+			}
+		}
+		printf("  T=%s L=%zu v=%s\n",
+		       osmo_gtlv_tag_inst_to_str_c(ctx, &gtlv.ti, NULL),
+		       gtlv.len, osmo_hexdump_nospc(gtlv.val, gtlv.len));
+	}
+
+	printf("- enforcing order: without restart, a past tag is not parsed again:\n");
+	/* Try to read the first tag, expect that it isn't found because we're already halfway in the message data */
+	ie = ies;
+	rc = osmo_gtlv_load_next_by_tag_inst(&gtlv, &ie->ti);
+	printf("  osmo_gtlv_load_next_by_tag_inst(%s) rc=", osmo_gtlv_tag_inst_to_str_c(ctx, &ie->ti, NULL));
+	if (rc == -ENOENT) {
+		printf("-ENOENT\n");
+	} else {
+		printf("%d\n", rc);
+		printf("  ERROR: expected -ENOENT\n");
+		exit(1);
+	}
+}
+
+void test_tlv(const char *label, struct ie *tests[], size_t tests_len, const struct osmo_gtlv_cfg *cfg)
+{
+	int i;
+	for (i = 0; i < tests_len; i++) {
+		const struct ie *ies = tests[i];
+		struct msgb *msg;
+		printf("\n=== start: %s[%d]\n", label, i);
+
+		msg = test_tlv_enc(cfg, ies);
+		test_tlv_dec(cfg, ies, msg);
+		test_tlv_peek(cfg, ies, msg);
+		test_tlv_dec_by_tag(cfg, ies, msg);
+
+		msgb_free(msg);
+
+		printf("=== end: %s[%d]\n", label, i);
+	}
+}
+
+struct ie t8l8v_test1[] = {
+	/* smallest T */
+	{ {}, "2342" },
+	/* largest T */
+	{ {255}, "2342" },
+
+	/* smallest V (no V data) */
+	{ {1}, "" },
+	/* largest V, 255 bytes is the largest that an 8bit size length can express. */
+	{ {123}, "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+	       "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+	       "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+	       "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+	       "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+	       "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+	       "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+	       "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+	},
+
+	/* arbitrary test data */
+	{ {101}, "11" },
+	{ {102}, "2222" },
+	{ {103}, "333333" },
+	{}
+};
+
+struct ie t8l8v_test_multi[] = {
+	{ {42}, "42" },
+	{ {2}, "0101" },
+	{ {2}, "2222" },
+	{ {3}, "11" },
+	{ {3}, "2222" },
+	{ {3}, "333333" },
+	{ {23}, "23" },
+	{ {42}, "666f72747974776f" },
+	{ {23}, "7477656e74797468726565" },
+	{}
+};
+
+struct ie *t8l8v_tests[] = {
+	t8l8v_test1,
+	t8l8v_test_multi,
+};
+
+void test_t8l8v()
+{
+	test_tlv(__func__, t8l8v_tests, ARRAY_SIZE(t8l8v_tests), &osmo_t8l8v_cfg);
+}
+
+struct ie t16l16v_test1[] = {
+	/* smallest T */
+	{ {}, "2342" },
+	/* largest T */
+	{ {65535}, "2342" },
+
+	/* smallest V (no V data) */
+	{ {1}, "" },
+	/* 256 bytes is one more than an 8bit size length can express. */
+	{ {123}, "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	},
+
+	/* arbitrary test data */
+	{ {1001}, "11" },
+	{ {1002}, "2222" },
+	{ {1003}, "333333" },
+	{}
+};
+
+struct ie t16l16v_test_multi[] = {
+	{ {1042}, "42" },
+	{ {102}, "0101" },
+	{ {102}, "2222" },
+	{ {103}, "11" },
+	{ {103}, "2222" },
+	{ {103}, "333333" },
+	{ {1023}, "23" },
+	{ {1042}, "666f72747974776f" },
+	{ {1023}, "7477656e74797468726565" },
+	{}
+};
+
+struct ie *t16l16v_tests[] = {
+	t16l16v_test1,
+	t16l16v_test_multi,
+};
+
+void test_t16l16v()
+{
+	test_tlv(__func__, t16l16v_tests, ARRAY_SIZE(t16l16v_tests), &osmo_t16l16v_cfg);
+}
+
+struct ie txlxv_test1[] = {
+	/* smallest T */
+	{ {}, "2342" },
+	/* largest T that still fits in one encoded octet (highest bit serves as flag) */
+	{ {0x7f}, "2342" },
+	/* smallest T that needs two octets to be encoded (first octet = 0x80 flag + 0, second octet = 0x1) */
+	{ {0x80}, "2342" },
+	/* largest T that can be encoded in 16bit - one flag bit. */
+	{ {0x7fff}, "2342" },
+
+	/* smallest V (no V data) */
+	{ {1}, "" },
+	/* 256 bytes is one more than an 8bit size length can express. */
+	{ {123}, "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	       "0000000000000000000000000000000000000000000000000000000000000000"
+	},
+
+	/* arbitrary test data */
+	{ {1002}, "2222" },
+	{ {1003}, "333333" },
+	{}
+};
+
+struct ie txlxv_test_multi[] = {
+	{ {1042}, "42" },
+	{ {1002}, "0101" },
+	{ {1002}, "2222" },
+	{ {103}, "11" },
+	{ {103}, "2222" },
+	{ {103}, "333333" },
+	{ {1023}, "23" },
+	{ {1042}, "666f72747974776f" },
+	{ {1023}, "7477656e74797468726565" },
+	{}
+};
+
+struct ie *txlxv_tests[] = {
+	txlxv_test1,
+	txlxv_test_multi,
+};
+
+/* Example of defining a variable TL, where size of T and L depend on the actual tag and length values: load. */
+int txlxv_load_tl(struct osmo_gtlv_load *gtlv, const uint8_t *src_data, size_t src_data_len)
+{
+	const uint8_t *pos = src_data;
+	const uint8_t *end = src_data + src_data_len;
+	if (pos[0] & 0x80) {
+		if (pos + 2 > end)
+			return -EINVAL;
+		gtlv->ti.tag = (((int)pos[1]) << 7) + (pos[0] & 0x7f);
+		pos += 2;
+	} else {
+		gtlv->ti.tag = pos[0];
+		pos++;
+	}
+
+	switch (gtlv->ti.tag) {
+	case 1002:
+		/* fixed-length IE */
+		gtlv->len = 2;
+		break;
+	case 123:
+		/* 16bit length IE */
+		if (pos + 2 > end)
+			return -EINVAL;
+		gtlv->len = osmo_load16be(pos);
+		pos += 2;
+		break;
+	default:
+		/* 8bit length IE */
+		if (pos + 1 > end)
+			return -EINVAL;
+		gtlv->len = *pos;
+		pos++;
+		break;
+	}
+	gtlv->val = pos;
+	return 0;
+}
+
+/* Example of defining a variable TL, where size of T and L depend on the actual tag and length values: store. */
+int txlxv_store_tl(uint8_t *dst_data, size_t dst_data_avail, const struct osmo_gtlv_tag_inst *ti, size_t len,
+		   struct osmo_gtlv_put *gtlv)
+{
+	uint8_t *pos = dst_data;
+	uint8_t *end = dst_data + dst_data_avail;
+	unsigned int tag = ti->tag;
+	if (tag < 0x80) {
+		if (pos + 1 > end)
+			return -ENOSPC;
+		pos[0] = tag;
+		pos++;
+	} else {
+		if (pos + 2 > end)
+			return -ENOSPC;
+		pos[0] = 0x80 + (tag & 0x7f);
+		pos[1] = tag >> 7;
+		pos += 2;
+	}
+
+	switch (tag) {
+	case 1002:
+		/* fixed-length IE, write no len */
+		break;
+	case 123:
+		/* 16bit length IE */
+		if (len > UINT16_MAX)
+			return -ERANGE;
+		if (pos + 2 > end)
+			return -ENOSPC;
+		osmo_store16be(len, pos);
+		pos += 2;
+		break;
+	default:
+		/* 8bit length IE */
+		if (len > UINT8_MAX)
+			return -ERANGE;
+		if (pos + 1 > end)
+			return -ENOSPC;
+		pos[0] = len;
+		pos++;
+		break;
+	}
+	return pos - dst_data;
+}
+
+const struct osmo_gtlv_cfg txlxv_cfg = {
+	.tl_min_size = 1,
+	.load_tl = txlxv_load_tl,
+	.store_tl = txlxv_store_tl,
+};
+
+void test_txlxv()
+{
+	test_tlv(__func__, txlxv_tests, ARRAY_SIZE(txlxv_tests), &txlxv_cfg);
+}
+
+/* Example of defining a TLI, with an instance indicator */
+static int tliv_load_tl(struct osmo_gtlv_load *gtlv, const uint8_t *src_data, size_t src_data_len)
+{
+	/* already validated in next_tl_valid(): src_data_len >= cfg->tl_min_size == 2. */
+	gtlv->ti.tag = src_data[0];
+	gtlv->len = src_data[1];
+
+	switch (gtlv->ti.tag) {
+	/* All tags that are TLIV go here */
+	case 5:
+	case 7:
+	case 9:
+		if (src_data_len < 3)
+			return -ENOSPC;
+		gtlv->ti.instance_present = true;
+		gtlv->ti.instance = src_data[2];
+		gtlv->val = src_data + 3;
+		return 0;
+	default:
+		gtlv->val = src_data + 2;
+		return 0;
+	}
+}
+
+static int tliv_store_tl(uint8_t *dst_data, size_t dst_data_avail, const struct osmo_gtlv_tag_inst *ti, size_t len,
+			 struct osmo_gtlv_put *gtlv)
+{
+	if (ti->tag > UINT8_MAX)
+		return -EINVAL;
+	if (len > UINT8_MAX)
+		return -EMSGSIZE;
+	if (dst_data_avail < 2)
+		return -ENOSPC;
+
+	dst_data[0] = ti->tag;
+	dst_data[1] = len;
+
+	switch (ti->tag) {
+	/* All tags that are TLIV go here */
+	case 5:
+	case 7:
+	case 9:
+		if (dst_data_avail < 3)
+			return -ENOSPC;
+		if (!ti->instance_present)
+			return -EINVAL;
+		if (ti->instance > UINT8_MAX)
+			return -EINVAL;
+		dst_data[2] = ti->instance;
+		return 3;
+	default:
+		return 2;
+	}
+}
+
+const struct osmo_gtlv_cfg osmo_tliv_cfg = {
+	.tl_min_size = 2,
+	.load_tl = tliv_load_tl,
+	.store_tl = tliv_store_tl,
+};
+
+struct ie tliv_test1[] = {
+	/* TLV */
+	{ {1}, "0002" },
+	/* TLIV */
+	{ {5, true, 1}, "0017" },
+	/* TLIV */
+	{ {5, true, 2}, "0018" },
+	/* TLIV */
+	{ {5, true, 3}, "0019" },
+	/* TLV */
+	{ {6}, "001a" },
+	/* TLIV */
+	{ {7, true, 1}, "001b" },
+	/* TLIV */
+	{ {9, true, 1}, "001c" },
+	{}
+};
+
+struct ie *tliv_tests[] = {
+	tliv_test1,
+};
+
+void test_tliv()
+{
+	test_tlv(__func__, tliv_tests, ARRAY_SIZE(tliv_tests), &osmo_tliv_cfg);
+}
+
+int main()
+{
+	ctx = talloc_named_const(NULL, 0, "gtlv_test");
+	msgb_talloc_ctx_init(ctx, 0);
+
+	test_t8l8v();
+	test_t16l16v();
+	test_txlxv();
+	test_tliv();
+
+	talloc_free(ctx);
+	return 0;
+}

tests/libosmo-gtlv/gtlv_test.ok

@@ -0,0 +1,291 @@
+
+=== start: test_t8l8v[0]
+- encoded: 00 02 23 42 ff 02 23 42 01 00 7b ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 65 01 11 66 02 22 22 67 03 33 33 33 .
+- decoding:
+  T=0 L=2 v=2342
+  T=255 L=2 v=2342
+  T=1 L=0 v=
+  T=123 L=255 v=ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
+  T=101 L=1 v=11
+  T=102 L=2 v=2222
+  T=103 L=3 v=333333
+- peeking:
+  peek T=0
+  peek T=255
+  peek T=1
+  peek T=123
+  peek T=101
+  peek T=102
+  peek T=103
+  peek rc=-ENOENT
+- decoding in reverse order:
+  T=103 L=3 v=333333
+  T=102 L=2 v=2222
+  T=101 L=1 v=11
+  T=123 L=255 v=ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
+  T=1 L=0 v=
+  T=255 L=2 v=2342
+  T=0 L=2 v=2342
+- decoding every second tag:
+  T=255 L=2 v=2342
+  T=123 L=255 v=ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
+  T=102 L=2 v=2222
+- enforcing order: without restart, a past tag is not parsed again:
+  osmo_gtlv_load_next_by_tag_inst(0) rc=-ENOENT
+=== end: test_t8l8v[0]
+
+=== start: test_t8l8v[1]
+- encoded: 2a 01 42 02 02 01 01 02 02 22 22 03 01 11 03 02 22 22 03 03 33 33 33 17 01 23 2a 08 66 6f 72 74 79 74 77 6f 17 0b 74 77 65 6e 74 79 74 68 72 65 65 .
+- decoding:
+  T=42 L=1 v=42
+  T=2 L=2 v=0101
+  T=2 L=2 v=2222
+  T=3 L=1 v=11
+  T=3 L=2 v=2222
+  T=3 L=3 v=333333
+  T=23 L=1 v=23
+  T=42 L=8 v=666f72747974776f
+  T=23 L=11 v=7477656e74797468726565
+- peeking:
+  peek T=42
+  peek T=2
+  peek T=2
+  peek T=3
+  peek T=3
+  peek T=3
+  peek T=23
+  peek T=42
+  peek T=23
+  peek rc=-ENOENT
+- decoding in reverse order:
+   (mismatch: T=23 L=1 v=23, checking for another occurrence of T=23)
+  T=23 L=11 v=7477656e74797468726565
+   (mismatch: T=42 L=1 v=42, checking for another occurrence of T=42)
+  T=42 L=8 v=666f72747974776f
+  T=23 L=1 v=23
+   (mismatch: T=3 L=1 v=11, checking for another occurrence of T=3)
+   (mismatch: T=3 L=2 v=2222, checking for another occurrence of T=3)
+  T=3 L=3 v=333333
+   (mismatch: T=3 L=1 v=11, checking for another occurrence of T=3)
+  T=3 L=2 v=2222
+  T=3 L=1 v=11
+   (mismatch: T=2 L=2 v=0101, checking for another occurrence of T=2)
+  T=2 L=2 v=2222
+  T=2 L=2 v=0101
+  T=42 L=1 v=42
+- decoding every second tag:
+  T=2 L=2 v=0101
+  T=3 L=1 v=11
+   (mismatch: T=3 L=2 v=2222, checking for another occurrence of T=3)
+  T=3 L=3 v=333333
+  T=42 L=8 v=666f72747974776f
+- enforcing order: without restart, a past tag is not parsed again:
+  osmo_gtlv_load_next_by_tag_inst(42) rc=-ENOENT
+=== end: test_t8l8v[1]
+
+=== start: test_t16l16v[0]
+- encoded: 00 00 00 02 23 42 ff ff 00 02 23 42 00 01 00 00 00 7b 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 e9 00 01 11 03 ea 00 02 22 22 03 eb 00 03 33 33 33 .
+- decoding:
+  T=0 L=2 v=2342
+  T=65535 L=2 v=2342
+  T=1 L=0 v=
+  T=123 L=256 v=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+  T=1001 L=1 v=11
+  T=1002 L=2 v=2222
+  T=1003 L=3 v=333333
+- peeking:
+  peek T=0
+  peek T=65535
+  peek T=1
+  peek T=123
+  peek T=1001
+  peek T=1002
+  peek T=1003
+  peek rc=-ENOENT
+- decoding in reverse order:
+  T=1003 L=3 v=333333
+  T=1002 L=2 v=2222
+  T=1001 L=1 v=11
+  T=123 L=256 v=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+  T=1 L=0 v=
+  T=65535 L=2 v=2342
+  T=0 L=2 v=2342
+- decoding every second tag:
+  T=65535 L=2 v=2342
+  T=123 L=256 v=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+  T=1002 L=2 v=2222
+- enforcing order: without restart, a past tag is not parsed again:
+  osmo_gtlv_load_next_by_tag_inst(0) rc=-ENOENT
+=== end: test_t16l16v[0]
+
+=== start: test_t16l16v[1]
+- encoded: 04 12 00 01 42 00 66 00 02 01 01 00 66 00 02 22 22 00 67 00 01 11 00 67 00 02 22 22 00 67 00 03 33 33 33 03 ff 00 01 23 04 12 00 08 66 6f 72 74 79 74 77 6f 03 ff 00 0b 74 77 65 6e 74 79 74 68 72 65 65 .
+- decoding:
+  T=1042 L=1 v=42
+  T=102 L=2 v=0101
+  T=102 L=2 v=2222
+  T=103 L=1 v=11
+  T=103 L=2 v=2222
+  T=103 L=3 v=333333
+  T=1023 L=1 v=23
+  T=1042 L=8 v=666f72747974776f
+  T=1023 L=11 v=7477656e74797468726565
+- peeking:
+  peek T=1042
+  peek T=102
+  peek T=102
+  peek T=103
+  peek T=103
+  peek T=103
+  peek T=1023
+  peek T=1042
+  peek T=1023
+  peek rc=-ENOENT
+- decoding in reverse order:
+   (mismatch: T=1023 L=1 v=23, checking for another occurrence of T=1023)
+  T=1023 L=11 v=7477656e74797468726565
+   (mismatch: T=1042 L=1 v=42, checking for another occurrence of T=1042)
+  T=1042 L=8 v=666f72747974776f
+  T=1023 L=1 v=23
+   (mismatch: T=103 L=1 v=11, checking for another occurrence of T=103)
+   (mismatch: T=103 L=2 v=2222, checking for another occurrence of T=103)
+  T=103 L=3 v=333333
+   (mismatch: T=103 L=1 v=11, checking for another occurrence of T=103)
+  T=103 L=2 v=2222
+  T=103 L=1 v=11
+   (mismatch: T=102 L=2 v=0101, checking for another occurrence of T=102)
+  T=102 L=2 v=2222
+  T=102 L=2 v=0101
+  T=1042 L=1 v=42
+- decoding every second tag:
+  T=102 L=2 v=0101
+  T=103 L=1 v=11
+   (mismatch: T=103 L=2 v=2222, checking for another occurrence of T=103)
+  T=103 L=3 v=333333
+  T=1042 L=8 v=666f72747974776f
+- enforcing order: without restart, a past tag is not parsed again:
+  osmo_gtlv_load_next_by_tag_inst(1042) rc=-ENOENT
+=== end: test_t16l16v[1]
+
+=== start: test_txlxv[0]
+- encoded: 00 02 23 42 7f 02 23 42 80 01 02 23 42 ff ff 02 23 42 01 00 7b 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ea 07 22 22 eb 07 03 33 33 33 .
+- decoding:
+  T=0 L=2 v=2342
+  T=127 L=2 v=2342
+  T=128 L=2 v=2342
+  T=32767 L=2 v=2342
+  T=1 L=0 v=
+  T=123 L=256 v=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+  T=1002 L=2 v=2222
+  T=1003 L=3 v=333333
+- peeking:
+  peek T=0
+  peek T=127
+  peek T=128
+  peek T=32767
+  peek T=1
+  peek T=123
+  peek T=1002
+  peek T=1003
+  peek rc=-ENOENT
+- decoding in reverse order:
+  T=1003 L=3 v=333333
+  T=1002 L=2 v=2222
+  T=123 L=256 v=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+  T=1 L=0 v=
+  T=32767 L=2 v=2342
+  T=128 L=2 v=2342
+  T=127 L=2 v=2342
+  T=0 L=2 v=2342
+- decoding every second tag:
+  T=127 L=2 v=2342
+  T=32767 L=2 v=2342
+  T=123 L=256 v=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+  T=1003 L=3 v=333333
+- enforcing order: without restart, a past tag is not parsed again:
+  osmo_gtlv_load_next_by_tag_inst(0) rc=-ENOENT
+=== end: test_txlxv[0]
+
+=== start: test_txlxv[1]
+- encoded: 92 08 01 42 ea 07 01 01 ea 07 22 22 67 01 11 67 02 22 22 67 03 33 33 33 ff 07 01 23 92 08 08 66 6f 72 74 79 74 77 6f ff 07 0b 74 77 65 6e 74 79 74 68 72 65 65 .
+- decoding:
+  T=1042 L=1 v=42
+  T=1002 L=2 v=0101
+  T=1002 L=2 v=2222
+  T=103 L=1 v=11
+  T=103 L=2 v=2222
+  T=103 L=3 v=333333
+  T=1023 L=1 v=23
+  T=1042 L=8 v=666f72747974776f
+  T=1023 L=11 v=7477656e74797468726565
+- peeking:
+  peek T=1042
+  peek T=1002
+  peek T=1002
+  peek T=103
+  peek T=103
+  peek T=103
+  peek T=1023
+  peek T=1042
+  peek T=1023
+  peek rc=-ENOENT
+- decoding in reverse order:
+   (mismatch: T=1023 L=1 v=23, checking for another occurrence of T=1023)
+  T=1023 L=11 v=7477656e74797468726565
+   (mismatch: T=1042 L=1 v=42, checking for another occurrence of T=1042)
+  T=1042 L=8 v=666f72747974776f
+  T=1023 L=1 v=23
+   (mismatch: T=103 L=1 v=11, checking for another occurrence of T=103)
+   (mismatch: T=103 L=2 v=2222, checking for another occurrence of T=103)
+  T=103 L=3 v=333333
+   (mismatch: T=103 L=1 v=11, checking for another occurrence of T=103)
+  T=103 L=2 v=2222
+  T=103 L=1 v=11
+   (mismatch: T=1002 L=2 v=0101, checking for another occurrence of T=1002)
+  T=1002 L=2 v=2222
+  T=1002 L=2 v=0101
+  T=1042 L=1 v=42
+- decoding every second tag:
+  T=1002 L=2 v=0101
+  T=103 L=1 v=11
+   (mismatch: T=103 L=2 v=2222, checking for another occurrence of T=103)
+  T=103 L=3 v=333333
+  T=1042 L=8 v=666f72747974776f
+- enforcing order: without restart, a past tag is not parsed again:
+  osmo_gtlv_load_next_by_tag_inst(1042) rc=-ENOENT
+=== end: test_txlxv[1]
+
+=== start: test_tliv[0]
+- encoded: 01 02 00 02 05 02 01 00 17 05 02 02 00 18 05 02 03 00 19 06 02 00 1a 07 02 01 00 1b 09 02 01 00 1c .
+- decoding:
+  T=1 L=2 v=0002
+  T=5[1] L=2 v=0017
+  T=5[2] L=2 v=0018
+  T=5[3] L=2 v=0019
+  T=6 L=2 v=001a
+  T=7[1] L=2 v=001b
+  T=9[1] L=2 v=001c
+- peeking:
+  peek T=1
+  peek T=5[1]
+  peek T=5[2]
+  peek T=5[3]
+  peek T=6
+  peek T=7[1]
+  peek T=9[1]
+  peek rc=-ENOENT
+- decoding in reverse order:
+  T=9[1] L=2 v=001c
+  T=7[1] L=2 v=001b
+  T=6 L=2 v=001a
+  T=5[3] L=2 v=0019
+  T=5[2] L=2 v=0018
+  T=5[1] L=2 v=0017
+  T=1 L=2 v=0002
+- decoding every second tag:
+  T=5[1] L=2 v=0017
+  T=5[3] L=2 v=0019
+  T=7[1] L=2 v=001b
+- enforcing order: without restart, a past tag is not parsed again:
+  osmo_gtlv_load_next_by_tag_inst(1) rc=-ENOENT
+=== end: test_tliv[0]

tests/libosmo-gtlv/test_gtlv_gen/Makefile.am

@@ -0,0 +1,60 @@
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(bulddir) \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	gen__myproto_ies_auto \
+	gtlv_gen_test \
+	$(NULL)
+
+EXTRA_DIST = \
+	myproto_ies_custom.h \
+	gtlv_gen_test.ok \
+	$(NULL)
+
+BUILT_SOURCES = \
+	myproto_ies_auto.h \
+	myproto_ies_auto.c \
+	$(NULL)
+
+CLEANFILES = \
+	myproto_ies_auto.h \
+	myproto_ies_auto.c \
+	$(NULL)
+
+gen__myproto_ies_auto_SOURCES = \
+	gen__myproto_ies_auto.c \
+	myproto_ies_custom.c \
+	$(NULL)
+
+gen__myproto_ies_auto_LDADD = \
+	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(NULL)
+
+myproto_ies_auto.h: $(builddir)/gen__myproto_ies_auto
+	$(builddir)/gen__myproto_ies_auto h > $(builddir)/myproto_ies_auto.h
+myproto_ies_auto.c: $(builddir)/gen__myproto_ies_auto
+	$(builddir)/gen__myproto_ies_auto c > $(builddir)/myproto_ies_auto.c
+
+gtlv_gen_test_SOURCES = \
+	gtlv_gen_test.c \
+	myproto_ies_custom.c \
+	myproto_ies_auto.c \
+	$(NULL)
+
+gtlv_gen_test_LDADD = \
+	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(NULL)
+
+.PHONY: update_exp
+update_exp:
+	$(builddir)/gtlv_gen_test >$(srcdir)/gtlv_gen_test.ok

tests/libosmo-gtlv/test_gtlv_gen/gen__myproto_ies_auto.c

@@ -0,0 +1,114 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/gtlv/gtlv_gen.h>
+
+#define O OSMO_GTLV_GEN_O
+#define M OSMO_GTLV_GEN_M
+#define O_MULTI OSMO_GTLV_GEN_O_MULTI
+#define M_MULTI OSMO_GTLV_GEN_M_MULTI
+
+#define ALL_FROM_NAME osmo_gtlv_gen_ie_auto
+
+/* An IE where the type is not a 'struct myproto_ie_${name}'. */
+static const struct osmo_gtlv_gen_ie number = {
+	.decoded_type =	"int", /* add 'int foo;' to the struct */
+	.dec_enc = "u16", /* use myproto_dec_u16() and myproto_enc_u16() for the TLV value part */
+	.spec_ref = "an int coded as uint16_t",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_moo_nest[] = {
+	/* Mandatory member xxx.foo of the type defined in 'number' above. */
+	M(number, "foo"),
+	/* Mandatory member xxx.bar of type 'struct myproto_ie_bar', using myproto_ie_dec_bar(), myproto_ie_enc_bar(),
+	 * myproto_ie_enc_to_str_bar(), all defined in myproto_ies_custom.h/c. */
+	M(ALL_FROM_NAME, "bar"),
+	M(ALL_FROM_NAME, "baz"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie huge_number = {
+	.decoded_type =	"uint64_t",
+	.dec_enc = "u64",
+};
+
+static const struct osmo_gtlv_gen_ie moo_nest = {
+	.tag_name = "moo_nest",
+	.nested_ies = ies_in_moo_nest,
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_goo_nest[] = {
+	O(huge_number, "val"),
+	M(moo_nest, "nest"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie goo_nest = {
+	.tag_name = "goo_nest",
+	.nested_ies = ies_in_goo_nest,
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_moo_msg[] = {
+	M(number, "foo"),
+	M(ALL_FROM_NAME, "bar"),
+	O(ALL_FROM_NAME, "baz"),
+	O_MULTI(32, number, "repeat_int"),
+	O_MULTI(32, ALL_FROM_NAME, "repeat_struct"),
+	O(moo_nest, "nest"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_goo_msg[] = {
+	M(number, "foo"),
+	O(ALL_FROM_NAME, "bar"),
+	O_MULTI(8, goo_nest, "nest"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_msg msg_defs[] = {
+	{ "moo", ies_in_moo_msg },
+	{ "goo", ies_in_goo_msg },
+	{}
+};
+
+int main(int argc, const char **argv)
+{
+	struct osmo_gtlv_gen_cfg cfg = {
+		.proto_name = "myproto",
+		.message_type_enum = "enum myproto_msg_type",
+		.message_type_prefix = "MYPROTO_MSGT_",
+		.tag_enum = "enum myproto_iei",
+		.tag_prefix = "MYPROTO_IEI_",
+		.decoded_type_prefix = "struct myproto_ie_",
+		.h_header = "#include \"myproto_ies_custom.h\"",
+		.c_header = "#include <myproto_ies_auto.h>",
+		.msg_defs = msg_defs,
+		.add_enc_to_str = true,
+	};
+	return osmo_gtlv_gen_main(&cfg, argc, argv);
+}

tests/libosmo-gtlv/test_gtlv_gen/gtlv_gen_test.c

@@ -0,0 +1,261 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
+
+#include <osmocom/gtlv/gtlv.h>
+
+#include <myproto_ies_auto.h>
+
+struct myproto_msg {
+	enum myproto_msg_type type;
+	union myproto_ies ies;
+};
+
+static void err_cb(void *data, void *decoded_struct, const char *file, int line, const char *fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	//printf("ERR: %s:%d ", file, line);
+	printf("ERR: ");
+	vprintf(fmt, args);
+	va_end(args);
+}
+
+static int myproto_msg_enc(struct msgb *dst, const struct myproto_msg *msg, const struct osmo_gtlv_cfg *cfg)
+{
+	struct osmo_gtlv_put gtlv = {
+		.cfg = cfg,
+		.dst = dst,
+	};
+
+	msgb_put_u8(gtlv.dst, msg->type);
+	return myproto_ies_encode(&gtlv, (void *)&msg->ies, msg->type, err_cb, NULL, myproto_iei_names);
+}
+
+static int myproto_msg_dec(struct myproto_msg *msg, const uint8_t *data, size_t data_len,
+			   const struct osmo_gtlv_cfg *cfg, bool ordered)
+{
+	struct osmo_gtlv_load gtlv;
+	if (data_len < 1)
+		return -EINVAL;
+	msg->type = data[0];
+	gtlv = (struct osmo_gtlv_load){
+		.cfg = cfg,
+		.src = { data + 1, data_len - 1 },
+	};
+	return myproto_ies_decode(&msg->ies, &gtlv, ordered, msg->type, err_cb, NULL, myproto_iei_names);
+}
+
+void *ctx;
+
+struct myproto_msg tests[] = {
+	{
+		MYPROTO_MSGT_MOO,
+		{
+			.moo = {
+				.foo = 23,
+				.bar = { "twentythree" },
+			},
+		},
+	},
+	{
+		MYPROTO_MSGT_MOO,
+		{
+			.moo = {
+				.foo = 23,
+				.bar = { "twentythree" },
+
+				.baz_present = true,
+				.baz = {
+					.v_int = 2323,
+					.v_bool = true,
+				},
+			},
+		},
+	},
+	{
+		MYPROTO_MSGT_MOO,
+		{
+			.moo = {
+				.foo = 23,
+				.bar = { "twentythree" },
+
+				.baz_present = true,
+				.baz = {
+					.v_int = 2323,
+					.v_bool = true,
+				},
+
+				.repeat_int_count = 3,
+				.repeat_int = { 1, 2, 0x7fff },
+			},
+		},
+	},
+	{
+		MYPROTO_MSGT_MOO,
+		{
+			.moo = {
+				.foo = 23,
+				.bar = { "twentythree" },
+
+				.baz_present = true,
+				.baz = {
+					.v_int = 2323,
+					.v_bool = true,
+				},
+
+				.repeat_int_count = 3,
+				.repeat_int = { 1, 2, 0x7fff },
+
+				.repeat_struct_count = 2,
+				.repeat_struct = {
+					{
+						.v_int = 1001,
+						.v_bool = true,
+						.v_enum = R_A,
+					},
+					{
+						.v_int = 1002,
+						.v_bool = false,
+						.v_enum = R_B,
+					},
+				},
+
+				.nest_present = true,
+				.nest = {
+					.foo = 42,
+					.bar = { "fortytwo" },
+					.baz = {
+						.v_int = 4242,
+						.v_bool = false,
+					},
+				},
+			},
+		},
+	},
+	{
+		MYPROTO_MSGT_GOO,
+		{
+			.goo = {
+				.foo = 17,
+
+				.bar_present = true,
+				.bar = { "gooei" },
+
+				.nest_count = 2,
+				.nest = {
+					{
+						.val_present = true,
+						.val = 0x0123456789abcdef,
+						.nest = {
+							.foo = 11,
+							.bar = { "eleven" },
+							.baz = {
+								.v_int = 1111,
+								.v_bool = true,
+							},
+						},
+					},
+					{
+						.val_present = false,
+						.nest = {
+							.foo = 12,
+							.bar = { "twelve" },
+							.baz = {
+								.v_int = 1212,
+								.v_bool = false,
+							},
+						},
+					},
+				},
+			},
+		},
+	},
+};
+
+int myproto_msg_to_str_buf(char *buf, size_t buflen, const struct myproto_msg *m)
+{
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+	OSMO_STRBUF_PRINTF(sb, "%s={", get_value_string(myproto_msg_type_names, m->type));
+	OSMO_STRBUF_APPEND(sb, osmo_gtlvs_encode_to_str_buf, &m->ies, 0, myproto_get_msg_coding(m->type),
+			   myproto_iei_names);
+	OSMO_STRBUF_PRINTF(sb, " }");
+	return sb.chars_needed;
+
+}
+
+char *myproto_msg_to_str(const struct myproto_msg *m)
+{
+	OSMO_NAME_C_IMPL(ctx, 256, "ERROR", myproto_msg_to_str_buf, m)
+}
+
+void test_enc_dec(const char *label, const struct osmo_gtlv_cfg *cfg, bool ordered)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(tests); i++) {
+		int rc;
+		const struct myproto_msg *orig = &tests[i];
+		struct myproto_msg parsed = {};
+		struct msgb *msg;
+
+		printf("\n=== start %s %s[%d]\n", label, __func__, i);
+		printf("encoded: %s\n", myproto_msg_to_str(orig));
+
+		msg = msgb_alloc(1024, __func__);
+		rc = myproto_msg_enc(msg, orig, cfg);
+		printf("myproto_msg_enc() rc = %d\n", rc);
+		printf("%s.\n", osmo_hexdump(msg->data, msg->len));
+
+		rc = myproto_msg_dec(&parsed, msg->data, msg->len, cfg, ordered);
+		printf("myproto_msg_dec() rc = %d\n", rc);
+		printf("decoded: %s\n", myproto_msg_to_str(&parsed));
+		if (strcmp(myproto_msg_to_str(orig), myproto_msg_to_str(&parsed))) {
+			printf(" ERROR: parsed != orig\n");
+			exit(1);
+		}
+
+		msgb_free(msg);
+		printf("=== end %s %s[%d]\n", label, __func__, i);
+	}
+}
+
+int main()
+{
+	ctx = talloc_named_const(NULL, 0, "test_gen_tlv");
+	msgb_talloc_ctx_init(ctx, 0);
+
+	test_enc_dec("t8l8v ordered", &osmo_t8l8v_cfg, true);
+	test_enc_dec("t8l8v unordered", &osmo_t8l8v_cfg, false);
+
+	test_enc_dec("t16l16v ordered", &osmo_t16l16v_cfg, true);
+	test_enc_dec("t16l16v unordered", &osmo_t16l16v_cfg, false);
+
+	talloc_free(ctx);
+	return 0;
+}

tests/libosmo-gtlv/test_gtlv_gen/gtlv_gen_test.ok

@@ -0,0 +1,160 @@
+
+=== start t8l8v ordered test_enc_dec[0]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" }
+myproto_msg_enc() rc = 0
+01 01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" }
+=== end t8l8v ordered test_enc_dec[0]
+
+=== start t8l8v ordered test_enc_dec[1]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} }
+myproto_msg_enc() rc = 0
+01 01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} }
+=== end t8l8v ordered test_enc_dec[1]
+
+=== start t8l8v ordered test_enc_dec[2]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } }
+myproto_msg_enc() rc = 0
+01 01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 04 02 00 01 04 02 00 02 04 02 7f ff .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } }
+=== end t8l8v ordered test_enc_dec[2]
+
+=== start t8l8v ordered test_enc_dec[3]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'MOO_NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} } }
+myproto_msg_enc() rc = 0
+01 01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 04 02 00 01 04 02 00 02 04 02 7f ff 05 03 03 e9 80 05 03 03 ea 01 06 12 01 02 00 2a 02 08 66 6f 72 74 79 74 77 6f 03 02 10 92 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'MOO_NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} } }
+=== end t8l8v ordered test_enc_dec[3]
+
+=== start t8l8v ordered test_enc_dec[4]
+encoded: GOO={ 'FOO'=17 'BAR'="gooei" 'GOO_NEST'={ { 'VAL'=0x123456789abcdef 'MOO_NEST'={ 'FOO'=11 'BAR'="eleven" 'BAZ'={1111,true} } }, { 'MOO_NEST'={ 'FOO'=12 'BAR'="twelve" 'BAZ'={1212,false} } } } }
+myproto_msg_enc() rc = 0
+07 01 02 00 11 02 05 67 6f 6f 65 69 08 1c 07 08 01 23 45 67 89 ab cd ef 06 10 01 02 00 0b 02 06 65 6c 65 76 65 6e 03 02 84 57 08 12 06 10 01 02 00 0c 02 06 74 77 65 6c 76 65 03 02 04 bc .
+myproto_msg_dec() rc = 0
+decoded: GOO={ 'FOO'=17 'BAR'="gooei" 'GOO_NEST'={ { 'VAL'=0x123456789abcdef 'MOO_NEST'={ 'FOO'=11 'BAR'="eleven" 'BAZ'={1111,true} } }, { 'MOO_NEST'={ 'FOO'=12 'BAR'="twelve" 'BAZ'={1212,false} } } } }
+=== end t8l8v ordered test_enc_dec[4]
+
+=== start t8l8v unordered test_enc_dec[0]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" }
+myproto_msg_enc() rc = 0
+01 01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" }
+=== end t8l8v unordered test_enc_dec[0]
+
+=== start t8l8v unordered test_enc_dec[1]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} }
+myproto_msg_enc() rc = 0
+01 01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} }
+=== end t8l8v unordered test_enc_dec[1]
+
+=== start t8l8v unordered test_enc_dec[2]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } }
+myproto_msg_enc() rc = 0
+01 01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 04 02 00 01 04 02 00 02 04 02 7f ff .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } }
+=== end t8l8v unordered test_enc_dec[2]
+
+=== start t8l8v unordered test_enc_dec[3]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'MOO_NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} } }
+myproto_msg_enc() rc = 0
+01 01 02 00 17 02 0b 74 77 65 6e 74 79 74 68 72 65 65 03 02 89 13 04 02 00 01 04 02 00 02 04 02 7f ff 05 03 03 e9 80 05 03 03 ea 01 06 12 01 02 00 2a 02 08 66 6f 72 74 79 74 77 6f 03 02 10 92 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'MOO_NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} } }
+=== end t8l8v unordered test_enc_dec[3]
+
+=== start t8l8v unordered test_enc_dec[4]
+encoded: GOO={ 'FOO'=17 'BAR'="gooei" 'GOO_NEST'={ { 'VAL'=0x123456789abcdef 'MOO_NEST'={ 'FOO'=11 'BAR'="eleven" 'BAZ'={1111,true} } }, { 'MOO_NEST'={ 'FOO'=12 'BAR'="twelve" 'BAZ'={1212,false} } } } }
+myproto_msg_enc() rc = 0
+07 01 02 00 11 02 05 67 6f 6f 65 69 08 1c 07 08 01 23 45 67 89 ab cd ef 06 10 01 02 00 0b 02 06 65 6c 65 76 65 6e 03 02 84 57 08 12 06 10 01 02 00 0c 02 06 74 77 65 6c 76 65 03 02 04 bc .
+myproto_msg_dec() rc = 0
+decoded: GOO={ 'FOO'=17 'BAR'="gooei" 'GOO_NEST'={ { 'VAL'=0x123456789abcdef 'MOO_NEST'={ 'FOO'=11 'BAR'="eleven" 'BAZ'={1111,true} } }, { 'MOO_NEST'={ 'FOO'=12 'BAR'="twelve" 'BAZ'={1212,false} } } } }
+=== end t8l8v unordered test_enc_dec[4]
+
+=== start t16l16v ordered test_enc_dec[0]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" }
+myproto_msg_enc() rc = 0
+01 00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" }
+=== end t16l16v ordered test_enc_dec[0]
+
+=== start t16l16v ordered test_enc_dec[1]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} }
+myproto_msg_enc() rc = 0
+01 00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} }
+=== end t16l16v ordered test_enc_dec[1]
+
+=== start t16l16v ordered test_enc_dec[2]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } }
+myproto_msg_enc() rc = 0
+01 00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 00 04 00 02 00 01 00 04 00 02 00 02 00 04 00 02 7f ff .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } }
+=== end t16l16v ordered test_enc_dec[2]
+
+=== start t16l16v ordered test_enc_dec[3]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'MOO_NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} } }
+myproto_msg_enc() rc = 0
+01 00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 00 04 00 02 00 01 00 04 00 02 00 02 00 04 00 02 7f ff 00 05 00 03 03 e9 80 00 05 00 03 03 ea 01 00 06 00 18 00 01 00 02 00 2a 00 02 00 08 66 6f 72 74 79 74 77 6f 00 03 00 02 10 92 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'MOO_NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} } }
+=== end t16l16v ordered test_enc_dec[3]
+
+=== start t16l16v ordered test_enc_dec[4]
+encoded: GOO={ 'FOO'=17 'BAR'="gooei" 'GOO_NEST'={ { 'VAL'=0x123456789abcdef 'MOO_NEST'={ 'FOO'=11 'BAR'="eleven" 'BAZ'={1111,true} } }, { 'MOO_NEST'={ 'FOO'=12 'BAR'="twelve" 'BAZ'={1212,false} } } } }
+myproto_msg_enc() rc = 0
+07 00 01 00 02 00 11 00 02 00 05 67 6f 6f 65 69 00 08 00 26 00 07 00 08 01 23 45 67 89 ab cd ef 00 06 00 16 00 01 00 02 00 0b 00 02 00 06 65 6c 65 76 65 6e 00 03 00 02 84 57 00 08 00 1a 00 06 00 16 00 01 00 02 00 0c 00 02 00 06 74 77 65 6c 76 65 00 03 00 02 04 bc .
+myproto_msg_dec() rc = 0
+decoded: GOO={ 'FOO'=17 'BAR'="gooei" 'GOO_NEST'={ { 'VAL'=0x123456789abcdef 'MOO_NEST'={ 'FOO'=11 'BAR'="eleven" 'BAZ'={1111,true} } }, { 'MOO_NEST'={ 'FOO'=12 'BAR'="twelve" 'BAZ'={1212,false} } } } }
+=== end t16l16v ordered test_enc_dec[4]
+
+=== start t16l16v unordered test_enc_dec[0]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" }
+myproto_msg_enc() rc = 0
+01 00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" }
+=== end t16l16v unordered test_enc_dec[0]
+
+=== start t16l16v unordered test_enc_dec[1]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} }
+myproto_msg_enc() rc = 0
+01 00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} }
+=== end t16l16v unordered test_enc_dec[1]
+
+=== start t16l16v unordered test_enc_dec[2]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } }
+myproto_msg_enc() rc = 0
+01 00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 00 04 00 02 00 01 00 04 00 02 00 02 00 04 00 02 7f ff .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } }
+=== end t16l16v unordered test_enc_dec[2]
+
+=== start t16l16v unordered test_enc_dec[3]
+encoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'MOO_NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} } }
+myproto_msg_enc() rc = 0
+01 00 01 00 02 00 17 00 02 00 0b 74 77 65 6e 74 79 74 68 72 65 65 00 03 00 02 89 13 00 04 00 02 00 01 00 04 00 02 00 02 00 04 00 02 7f ff 00 05 00 03 03 e9 80 00 05 00 03 03 ea 01 00 06 00 18 00 01 00 02 00 2a 00 02 00 08 66 6f 72 74 79 74 77 6f 00 03 00 02 10 92 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'FOO'=23 'BAR'="twentythree" 'BAZ'={2323,true} 'REPEAT_INT'={ 1, 2, 32767 } 'REPEAT_STRUCT'={ {1001,true,R_A}, {1002,false,R_B} } 'MOO_NEST'={ 'FOO'=42 'BAR'="fortytwo" 'BAZ'={4242,false} } }
+=== end t16l16v unordered test_enc_dec[3]
+
+=== start t16l16v unordered test_enc_dec[4]
+encoded: GOO={ 'FOO'=17 'BAR'="gooei" 'GOO_NEST'={ { 'VAL'=0x123456789abcdef 'MOO_NEST'={ 'FOO'=11 'BAR'="eleven" 'BAZ'={1111,true} } }, { 'MOO_NEST'={ 'FOO'=12 'BAR'="twelve" 'BAZ'={1212,false} } } } }
+myproto_msg_enc() rc = 0
+07 00 01 00 02 00 11 00 02 00 05 67 6f 6f 65 69 00 08 00 26 00 07 00 08 01 23 45 67 89 ab cd ef 00 06 00 16 00 01 00 02 00 0b 00 02 00 06 65 6c 65 76 65 6e 00 03 00 02 84 57 00 08 00 1a 00 06 00 16 00 01 00 02 00 0c 00 02 00 06 74 77 65 6c 76 65 00 03 00 02 04 bc .
+myproto_msg_dec() rc = 0
+decoded: GOO={ 'FOO'=17 'BAR'="gooei" 'GOO_NEST'={ { 'VAL'=0x123456789abcdef 'MOO_NEST'={ 'FOO'=11 'BAR'="eleven" 'BAZ'={1111,true} } }, { 'MOO_NEST'={ 'FOO'=12 'BAR'="twelve" 'BAZ'={1212,false} } } } }
+=== end t16l16v unordered test_enc_dec[4]

tests/libosmo-gtlv/test_gtlv_gen/myproto_ies_custom.c

@@ -0,0 +1,180 @@
+/* Example for defining custom IES for gtlv_gen. */
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <errno.h>
+#include <inttypes.h>
+
+#include <osmocom/core/bits.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/gtlv/gtlv.h>
+
+#include <myproto_ies_custom.h>
+
+int myproto_dec_u16(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv)
+{
+	int *foo = decode_to;
+	if (gtlv->len != 2)
+		return -EINVAL;
+	*foo = osmo_load16be(gtlv->val);
+	return 0;
+}
+
+int myproto_enc_u16(struct osmo_gtlv_put *gtlv, void *decoded_struct, void *encode_from)
+{
+	int *foo = encode_from;
+	if (*foo > INT16_MAX)
+		return -EINVAL;
+	msgb_put_u16(gtlv->dst, *foo);
+	return 0;
+}
+
+int myproto_enc_to_str_u16(char *buf, size_t buflen, void *encode_from)
+{
+	int *foo = encode_from;
+	return snprintf(buf, buflen, "%d", *foo);
+}
+
+int myproto_dec_u64(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv)
+{
+	uint64_t *val = decode_to;
+	if (gtlv->len != sizeof(uint64_t))
+		return -EINVAL;
+	*val = osmo_load64be(gtlv->val);
+	return 0;
+}
+
+int myproto_enc_u64(struct osmo_gtlv_put *gtlv, void *decoded_struct, void *encode_from)
+{
+	uint64_t *val = encode_from;
+	osmo_store64be(*val, msgb_put(gtlv->dst, sizeof(*val)));
+	return 0;
+}
+
+int myproto_enc_to_str_u64(char *buf, size_t buflen, void *encode_from)
+{
+	uint64_t *val = encode_from;
+	return snprintf(buf, buflen, "0x%"PRIx64, *val);
+}
+
+int myproto_dec_bar(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv)
+{
+	struct myproto_ie_bar *bar = decode_to;
+	if (gtlv->len > sizeof(bar->str) - 1)
+		return -EINVAL;
+	osmo_strlcpy(bar->str, (const char *)gtlv->val, OSMO_MIN(gtlv->len + 1, sizeof(bar->str)));
+	return 0;
+}
+
+int myproto_enc_bar(struct osmo_gtlv_put *gtlv, void *decoded_struct, void *encode_from)
+{
+	struct myproto_ie_bar *bar = encode_from;
+	int len = strnlen(bar->str, sizeof(bar->str));
+	memcpy(msgb_put(gtlv->dst, len), bar, len);
+	return 0;
+}
+
+int myproto_enc_to_str_bar(char *buf, size_t buflen, void *encode_from)
+{
+	struct myproto_ie_bar *bar = encode_from;
+	return osmo_quote_str_buf3(buf, buflen, bar->str, -1);
+}
+
+int myproto_dec_baz(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv)
+{
+	struct myproto_ie_baz *baz = decode_to;
+	uint16_t l;
+	if (gtlv->len != 2)
+		return -EINVAL;
+	l = osmo_load16be(gtlv->val);
+	baz->v_int = l & 0x7fff;
+	baz->v_bool = (l & 0x8000) ? true : false;
+	return 0;
+}
+
+int myproto_enc_baz(struct osmo_gtlv_put *gtlv, void *decoded_struct, void *encode_from)
+{
+	struct myproto_ie_baz *baz = encode_from;
+	if (baz->v_int > 0x7fff)
+		return -EINVAL;
+	msgb_put_u16(gtlv->dst, (baz->v_bool ? 0x8000 : 0) + (baz->v_int & 0x7fff));
+	return 0;
+}
+
+int myproto_enc_to_str_baz(char *buf, size_t buflen, void *encode_from)
+{
+	struct myproto_ie_baz *baz = encode_from;
+	return snprintf(buf, buflen, "{%d,%s}", baz->v_int, baz->v_bool ? "true" : "false");
+}
+
+int myproto_dec_repeat_struct(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv)
+{
+	struct myproto_ie_repeat_struct *repeat_struct = decode_to;
+	if (gtlv->len != 3)
+		return -EINVAL;
+	repeat_struct->v_int = osmo_load16be(gtlv->val);
+	repeat_struct->v_bool = gtlv->val[2] & 0x80;
+	repeat_struct->v_enum = gtlv->val[2] & 0x7f;
+	return 0;
+}
+
+int myproto_enc_repeat_struct(struct osmo_gtlv_put *gtlv, void *decoded_struct, void *encode_from)
+{
+	struct myproto_ie_repeat_struct *repeat_struct = encode_from;
+	msgb_put_u16(gtlv->dst, repeat_struct->v_int);
+	msgb_put_u8(gtlv->dst, (repeat_struct->v_bool ? 0x80 : 0) + (repeat_struct->v_enum & 0x7f));
+	return 0;
+}
+
+int myproto_enc_to_str_repeat_struct(char *buf, size_t buflen, void *encode_from)
+{
+	struct myproto_ie_repeat_struct *repeat_struct = encode_from;
+	return snprintf(buf, buflen, "{%d,%s,%s}",
+			repeat_struct->v_int, repeat_struct->v_bool ?  "true" : "false",
+			get_value_string(myproto_repeat_enum_names, repeat_struct->v_enum));
+}
+
+const struct value_string myproto_msg_type_names[] = {
+	{ MYPROTO_MSGT_MOO, "MOO" },
+	{ MYPROTO_MSGT_GOO, "GOO" },
+	{}
+};
+
+const struct value_string myproto_iei_names[] = {
+	{ MYPROTO_IEI_FOO, "FOO" },
+	{ MYPROTO_IEI_BAR, "BAR" },
+	{ MYPROTO_IEI_BAZ, "BAZ" },
+	{ MYPROTO_IEI_REPEAT_INT, "REPEAT_INT" },
+	{ MYPROTO_IEI_REPEAT_STRUCT, "REPEAT_STRUCT" },
+	{ MYPROTO_IEI_MOO_NEST, "MOO_NEST" },
+	{ MYPROTO_IEI_VAL, "VAL" },
+	{ MYPROTO_IEI_GOO_NEST, "GOO_NEST" },
+	{}
+};
+
+const struct value_string myproto_repeat_enum_names[] = {
+	OSMO_VALUE_STRING(R_A),
+	OSMO_VALUE_STRING(R_B),
+	OSMO_VALUE_STRING(R_C),
+	{}
+};

tests/libosmo-gtlv/test_gtlv_gen/myproto_ies_custom.h

@@ -0,0 +1,70 @@
+/* Definitions for decoded message IEs, to be used by the auto-generated myproto_ies_auto.c. */
+/*
+ * (C) 2021-2022 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 <osmocom/core/utils.h>
+
+enum myproto_msg_type {
+	MYPROTO_MSGT_MOO = 1,
+	MYPROTO_MSGT_GOO = 7,
+};
+
+extern const struct value_string myproto_msg_type_names[];
+
+enum myproto_iei {
+	MYPROTO_IEI_FOO = 1,
+	MYPROTO_IEI_BAR,
+	MYPROTO_IEI_BAZ,
+	MYPROTO_IEI_REPEAT_INT,
+	MYPROTO_IEI_REPEAT_STRUCT,
+	MYPROTO_IEI_MOO_NEST,
+	MYPROTO_IEI_VAL,
+	MYPROTO_IEI_GOO_NEST,
+};
+
+extern const struct value_string myproto_iei_names[];
+
+struct myproto_ie_bar {
+	char str[23];
+};
+
+struct myproto_ie_baz {
+	int v_int;
+	bool v_bool;
+};
+
+enum myproto_repeat_enum {
+	R_A,
+	R_B,
+	R_C,
+};
+
+extern const struct value_string myproto_repeat_enum_names[];
+
+struct myproto_ie_repeat_struct {
+	int v_int;
+	bool v_bool;
+	enum myproto_repeat_enum v_enum;
+};

tests/libosmo-gtlv/test_tliv/Makefile.am

@@ -0,0 +1,60 @@
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(bulddir) \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	gen__myproto_ies_auto \
+	tliv_test \
+	$(NULL)
+
+EXTRA_DIST = \
+	myproto_ies_custom.h \
+	tliv_test.ok \
+	$(NULL)
+
+BUILT_SOURCES = \
+	myproto_ies_auto.h \
+	myproto_ies_auto.c \
+	$(NULL)
+
+CLEANFILES = \
+	myproto_ies_auto.h \
+	myproto_ies_auto.c \
+	$(NULL)
+
+gen__myproto_ies_auto_SOURCES = \
+	gen__myproto_ies_auto.c \
+	myproto_ies_custom.c \
+	$(NULL)
+
+gen__myproto_ies_auto_LDADD = \
+	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(NULL)
+
+myproto_ies_auto.h: $(builddir)/gen__myproto_ies_auto
+	$(builddir)/gen__myproto_ies_auto h > $(builddir)/myproto_ies_auto.h
+myproto_ies_auto.c: $(builddir)/gen__myproto_ies_auto
+	$(builddir)/gen__myproto_ies_auto c > $(builddir)/myproto_ies_auto.c
+
+tliv_test_SOURCES = \
+	tliv_test.c \
+	myproto_ies_custom.c \
+	myproto_ies_auto.c \
+	$(NULL)
+
+tliv_test_LDADD = \
+	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(NULL)
+
+.PHONY: update_exp
+update_exp:
+	$(builddir)/tliv_test >$(srcdir)/tliv_test.ok

tests/libosmo-gtlv/test_tliv/gen__myproto_ies_auto.c

@@ -0,0 +1,71 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/gtlv/gtlv_gen.h>
+
+#define O OSMO_GTLV_GEN_O
+#define M OSMO_GTLV_GEN_M
+#define O_MULTI OSMO_GTLV_GEN_O_MULTI
+#define M_MULTI OSMO_GTLV_GEN_M_MULTI
+#define O_INST OSMO_GTLV_GEN_O_INST
+#define M_INST OSMO_GTLV_GEN_M_INST
+
+#define AUTO osmo_gtlv_gen_ie_auto
+
+static const struct osmo_gtlv_gen_ie bar = {
+	.tag_name = "bar",
+};
+
+static const struct osmo_gtlv_gen_ie_o ies_in_moo_msg[] = {
+	M_INST("MYPROTO_IEI_BAR_ALPHA", bar, "bar_alpha"),
+	O_INST("MYPROTO_IEI_BAR_BETA", bar, "bar_beta"),
+	M_INST("MYPROTO_IEI_BAR_GAMMA", bar, "bar_gamma"),
+	{}
+};
+
+static const struct osmo_gtlv_gen_msg msg_defs[] = {
+	{ "moo", ies_in_moo_msg },
+	{}
+};
+
+int main(int argc, const char **argv)
+{
+	struct osmo_gtlv_gen_cfg cfg = {
+		.proto_name = "myproto",
+		.message_type_enum = "enum myproto_msg_type",
+		.message_type_prefix = "MYPROTO_MSGT_",
+		.tag_enum = "enum myproto_iei",
+		.tag_prefix = "MYPROTO_IEI_",
+		.decoded_type_prefix = "struct myproto_ie_",
+		.h_header = "#include \"myproto_ies_custom.h\"",
+		.c_header = "#include <myproto_ies_auto.h>",
+		.msg_defs = msg_defs,
+		.add_enc_to_str = true,
+	};
+	return osmo_gtlv_gen_main(&cfg, argc, argv);
+}

tests/libosmo-gtlv/test_tliv/myproto_ies_custom.c

@@ -0,0 +1,68 @@
+/* Example for defining custom IES for gtlv_gen. */
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <errno.h>
+#include <inttypes.h>
+
+#include <osmocom/core/bits.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/gtlv/gtlv.h>
+
+#include <myproto_ies_custom.h>
+
+int myproto_dec_bar(void *decoded_struct, void *decode_to, const struct osmo_gtlv_load *gtlv)
+{
+	struct myproto_ie_bar *bar = decode_to;
+	if (gtlv->len < 2)
+		return -EINVAL;
+	*bar = (struct myproto_ie_bar){
+		.a = gtlv->val[0],
+		.b = (gtlv->val[1] == 1),
+	};
+	return 0;
+}
+
+int myproto_enc_bar(struct osmo_gtlv_put *gtlv, void *decoded_struct, void *encode_from)
+{
+	struct myproto_ie_bar *bar = encode_from;
+	msgb_put_u8(gtlv->dst, bar->a);
+	msgb_put_u8(gtlv->dst, bar->b ? 1 : 0);
+	return 0;
+}
+
+int myproto_enc_to_str_bar(char *buf, size_t buflen, void *encode_from)
+{
+	struct myproto_ie_bar *bar = encode_from;
+	return snprintf(buf, buflen, "%d,%s", bar->a, bar->b ? "true" : "false");
+}
+
+const struct value_string myproto_msg_type_names[] = {
+	{ MYPROTO_MSGT_MOO, "MOO" },
+	{}
+};
+
+const struct value_string myproto_iei_names[] = {
+	{ MYPROTO_IEI_BAR, "BAR" },
+	{}
+};

tests/libosmo-gtlv/test_tliv/myproto_ies_custom.h

@@ -0,0 +1,50 @@
+/* Definitions for decoded message IEs, to be used by the auto-generated myproto_ies_auto.c. */
+/*
+ * (C) 2021-2022 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 <osmocom/core/utils.h>
+
+enum myproto_msg_type {
+	MYPROTO_MSGT_MOO = 1,
+};
+
+extern const struct value_string myproto_msg_type_names[];
+
+enum myproto_iei {
+	MYPROTO_IEI_BAR = 1,
+};
+
+enum myproto_iei_bar_inst {
+	MYPROTO_IEI_BAR_ALPHA = 2,
+	MYPROTO_IEI_BAR_BETA = 3,
+	MYPROTO_IEI_BAR_GAMMA = 5,
+};
+
+extern const struct value_string myproto_iei_names[];
+
+struct myproto_ie_bar {
+	int a;
+	bool b;
+};

tests/libosmo-gtlv/test_tliv/tliv_test.c

@@ -0,0 +1,217 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
+
+#include <osmocom/gtlv/gtlv.h>
+
+#include <myproto_ies_auto.h>
+
+struct myproto_msg {
+	enum myproto_msg_type type;
+	union myproto_ies ies;
+};
+
+static void err_cb(void *data, void *decoded_struct, const char *file, int line, const char *fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	//printf("ERR: %s:%d ", file, line);
+	printf("ERR: ");
+	vprintf(fmt, args);
+	va_end(args);
+}
+
+static int myproto_msg_enc(struct msgb *dst, const struct myproto_msg *msg, const struct osmo_gtlv_cfg *cfg)
+{
+	struct osmo_gtlv_put gtlv = {
+		.cfg = cfg,
+		.dst = dst,
+	};
+
+	msgb_put_u8(gtlv.dst, msg->type);
+	return myproto_ies_encode(&gtlv, (void *)&msg->ies, msg->type, err_cb, NULL, myproto_iei_names);
+}
+
+static int myproto_msg_dec(struct myproto_msg *msg, const uint8_t *data, size_t data_len,
+			   const struct osmo_gtlv_cfg *cfg, bool ordered)
+{
+	struct osmo_gtlv_load gtlv;
+	if (data_len < 1)
+		return -EINVAL;
+	msg->type = data[0];
+	gtlv = (struct osmo_gtlv_load){
+		.cfg = cfg,
+		.src = { data + 1, data_len - 1 },
+	};
+	return myproto_ies_decode(&msg->ies, &gtlv, ordered, msg->type, err_cb, NULL, myproto_iei_names);
+}
+
+void *ctx;
+
+struct myproto_msg tests[] = {
+	{
+		MYPROTO_MSGT_MOO,
+		{
+			.moo = {
+				.bar_alpha = { 23, true },
+				.bar_gamma = { 42, false },
+			},
+		},
+	},
+	{
+		MYPROTO_MSGT_MOO,
+		{
+			.moo = {
+				.bar_alpha = { 11, true },
+				.bar_beta_present = true,
+				.bar_beta = { 22, false },
+				.bar_gamma = { 33, true },
+			},
+		},
+	},
+};
+
+int myproto_msg_to_str_buf(char *buf, size_t buflen, const struct myproto_msg *m)
+{
+	struct osmo_strbuf sb = { .buf = buf, .len = buflen };
+	OSMO_STRBUF_PRINTF(sb, "%s={", get_value_string(myproto_msg_type_names, m->type));
+	OSMO_STRBUF_APPEND(sb, osmo_gtlvs_encode_to_str_buf, &m->ies, 0, myproto_get_msg_coding(m->type),
+			   myproto_iei_names);
+	OSMO_STRBUF_PRINTF(sb, " }");
+	return sb.chars_needed;
+
+}
+
+char *myproto_msg_to_str(const struct myproto_msg *m)
+{
+	OSMO_NAME_C_IMPL(ctx, 256, "ERROR", myproto_msg_to_str_buf, m)
+}
+
+void test_enc_dec(const char *label, const struct osmo_gtlv_cfg *cfg, bool ordered)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(tests); i++) {
+		int rc;
+		const struct myproto_msg *orig = &tests[i];
+		struct myproto_msg parsed = {};
+		struct msgb *msg;
+
+		printf("\n=== start %s %s[%d]\n", label, __func__, i);
+		printf("encoded: %s\n", myproto_msg_to_str(orig));
+
+		msg = msgb_alloc(1024, __func__);
+		rc = myproto_msg_enc(msg, orig, cfg);
+		printf("myproto_msg_enc() rc = %d\n", rc);
+		printf("%s.\n", osmo_hexdump(msg->data, msg->len));
+
+		rc = myproto_msg_dec(&parsed, msg->data, msg->len, cfg, ordered);
+		printf("myproto_msg_dec() rc = %d\n", rc);
+		printf("decoded: %s\n", myproto_msg_to_str(&parsed));
+		if (strcmp(myproto_msg_to_str(orig), myproto_msg_to_str(&parsed))) {
+			printf(" ERROR: parsed != orig\n");
+			exit(1);
+		}
+
+		msgb_free(msg);
+		printf("=== end %s %s[%d]\n", label, __func__, i);
+	}
+}
+
+/* Example of defining a TLI, with an instance indicator */
+static int tliv_load_tl(struct osmo_gtlv_load *gtlv, const uint8_t *src_data, size_t src_data_len)
+{
+	/* already validated in next_tl_valid(): src_data_len >= cfg->tl_min_size == 2. */
+	gtlv->ti.tag = src_data[0];
+	gtlv->len = src_data[1];
+
+	switch (gtlv->ti.tag) {
+	/* All tags that are TLIV go here */
+	case MYPROTO_IEI_BAR:
+		if (src_data_len < 3)
+			return -ENOSPC;
+		gtlv->ti.instance_present = true;
+		gtlv->ti.instance = src_data[2];
+		gtlv->val = src_data + 3;
+		/* In this example, the I is part of the len */
+		gtlv->len--;
+		return 0;
+	default:
+		gtlv->val = src_data + 2;
+		return 0;
+	}
+}
+
+static int tliv_store_tl(uint8_t *dst_data, size_t dst_data_avail, const struct osmo_gtlv_tag_inst *ti, size_t len,
+			 struct osmo_gtlv_put *gtlv)
+{
+	if (ti->tag > UINT8_MAX)
+		return -EINVAL;
+	if (len > UINT8_MAX)
+		return -EMSGSIZE;
+	if (dst_data_avail < 2)
+		return -ENOSPC;
+
+	dst_data[0] = ti->tag;
+
+	switch (ti->tag) {
+	/* All tags that are TLIV go here */
+	case MYPROTO_IEI_BAR:
+		if (dst_data_avail < 3)
+			return -ENOSPC;
+		if (!ti->instance_present)
+			return -EINVAL;
+		if (ti->instance > UINT8_MAX)
+			return -EINVAL;
+		/* here, I is part of the len in L; the passed len reflects only the value, so add 1 for I */
+		dst_data[1] = len + 1;
+		dst_data[2] = ti->instance;
+		return 3;
+	default:
+		dst_data[1] = len;
+		return 2;
+	}
+}
+
+const struct osmo_gtlv_cfg osmo_tliv_cfg = {
+	.tl_min_size = 2,
+	.load_tl = tliv_load_tl,
+	.store_tl = tliv_store_tl,
+};
+
+int main()
+{
+	ctx = talloc_named_const(NULL, 0, "test_gen_tlv");
+	msgb_talloc_ctx_init(ctx, 0);
+
+	test_enc_dec("tliv ordered", &osmo_tliv_cfg, true);
+	test_enc_dec("tliv unordered", &osmo_tliv_cfg, false);
+
+	talloc_free(ctx);
+	return 0;
+}

tests/libosmo-gtlv/test_tliv/tliv_test.ok

@@ -0,0 +1,32 @@
+
+=== start tliv ordered test_enc_dec[0]
+encoded: MOO={ 'BAR'=23,true 'BAR'=42,false }
+myproto_msg_enc() rc = 0
+01 01 03 02 17 01 01 03 05 2a 00 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'BAR'=23,true 'BAR'=42,false }
+=== end tliv ordered test_enc_dec[0]
+
+=== start tliv ordered test_enc_dec[1]
+encoded: MOO={ 'BAR'=11,true 'BAR'=22,false 'BAR'=33,true }
+myproto_msg_enc() rc = 0
+01 01 03 02 0b 01 01 03 03 16 00 01 03 05 21 01 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'BAR'=11,true 'BAR'=22,false 'BAR'=33,true }
+=== end tliv ordered test_enc_dec[1]
+
+=== start tliv unordered test_enc_dec[0]
+encoded: MOO={ 'BAR'=23,true 'BAR'=42,false }
+myproto_msg_enc() rc = 0
+01 01 03 02 17 01 01 03 05 2a 00 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'BAR'=23,true 'BAR'=42,false }
+=== end tliv unordered test_enc_dec[0]
+
+=== start tliv unordered test_enc_dec[1]
+encoded: MOO={ 'BAR'=11,true 'BAR'=22,false 'BAR'=33,true }
+myproto_msg_enc() rc = 0
+01 01 03 02 0b 01 01 03 03 16 00 01 03 05 21 01 .
+myproto_msg_dec() rc = 0
+decoded: MOO={ 'BAR'=11,true 'BAR'=22,false 'BAR'=33,true }
+=== end tliv unordered test_enc_dec[1]

tests/libosmo-pfcp/Makefile.am

@@ -0,0 +1,32 @@
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir)/include \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	pfcp_test \
+	$(NULL)
+
+EXTRA_DIST = \
+	pfcp_test.ok \
+	$(NULL)
+
+pfcp_test_SOURCES = \
+	pfcp_test.c \
+	$(NULL)
+
+pfcp_test_LDADD = \
+	$(top_builddir)/src/libosmo-pfcp/libosmo-pfcp.a \
+	$(top_builddir)/src/libosmo-gtlv/libosmo-gtlv.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(NULL)
+
+.PHONY: update_exp
+update_exp:
+	$(builddir)/pfcp_test >$(srcdir)/pfcp_test.ok

tests/libosmo-pfcp/pfcp_test.c

@@ -0,0 +1,505 @@
+/*
+ * (C) 2021-2022 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/>.
+ *
+ */
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
+
+#include <osmocom/pfcp/pfcp_msg.h>
+
+void *ctx;
+
+static const struct osmo_sockaddr v4_ue = {
+	.u.sin = {
+		.sin_family = AF_INET,
+		.sin_addr = { 0x1700a8c0 },
+	}
+};
+
+static const struct osmo_sockaddr v4_gtp = {
+	.u.sin = {
+		.sin_family = AF_INET,
+		.sin_addr = { 0x0708090a },
+	}
+};
+
+static const struct osmo_pfcp_ie_f_teid f_teid_access_local = {
+	.choose_flag = true,
+	.choose = {
+		.ipv4_addr = true,
+	},
+};
+
+static const struct osmo_pfcp_ie_f_teid f_teid_created = {
+	.fixed = {
+		.teid = 1234,
+		.ip_addr = {
+			.v4_present = true,
+			.v4 = v4_gtp,
+		},
+	},
+};
+
+static const struct osmo_pfcp_ie_outer_header_creation ohc_access = {
+	.desc_bits = { 0x01 },
+	.teid_present = true,
+	.teid = 0xabcdef,
+	.ip_addr = {
+		.v4_present = true,
+		.v4 = v4_gtp,
+	},
+};
+
+static const struct osmo_pfcp_ie_apply_action aa_forw = {
+	.bits = { 0x02 },
+};
+
+static const struct osmo_pfcp_ie_f_seid f_seid = {
+	.seid = 0x1234567890abcdef,
+	.ip_addr = {
+		.v4_present = true,
+		.v4 = v4_gtp,
+	},
+};
+
+struct osmo_pfcp_msg tests[] = {
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_HEARTBEAT_REQ,
+			.sequence_nr = 1,
+		},
+		.ies.heartbeat_req = {
+			.recovery_time_stamp = 1234,
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_HEARTBEAT_RESP,
+			.sequence_nr = 2,
+		},
+		.ies.heartbeat_resp = {
+			.recovery_time_stamp = 5678,
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_ASSOC_SETUP_REQ,
+			.sequence_nr = 3,
+		},
+		.ies.assoc_setup_req = {
+			.node_id = {
+				.type = OSMO_PFCP_NODE_ID_T_IPV4,
+				.ip.u.sin = {
+					.sin_family = AF_INET,
+					.sin_addr = { 0x01020304 },
+				},
+			},
+			.recovery_time_stamp = 0x2b2b2b2b,
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_ASSOC_SETUP_RESP,
+			.sequence_nr = 4,
+		},
+		.ies.assoc_setup_resp = {
+			.node_id = {
+				.type = OSMO_PFCP_NODE_ID_T_FQDN,
+				.fqdn = "example.com",
+			},
+			.cause = OSMO_PFCP_CAUSE_REQUEST_ACCEPTED,
+			.recovery_time_stamp = 0x2b2b2b2b,
+			.up_function_features_present = true,
+			.up_function_features.bits = { 1, 2 },
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_ASSOC_RELEASE_REQ,
+			.sequence_nr = 5,
+		},
+		.ies.assoc_release_req = {
+			.node_id = {
+				.type = OSMO_PFCP_NODE_ID_T_IPV6,
+				.ip.u.sin6 = {
+					.sin6_family = AF_INET6,
+					.sin6_addr = {{{ 1, 2, 3, 4 }}},
+				},
+			},
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_ASSOC_RELEASE_RESP,
+			.sequence_nr = 6,
+		},
+		.ies.assoc_release_resp = {
+			.node_id = {
+				.type = OSMO_PFCP_NODE_ID_T_IPV4,
+				.ip.u.sin = {
+					.sin_family = AF_INET,
+					.sin_addr = { 0x01020304 },
+				},
+			},
+			.cause = OSMO_PFCP_CAUSE_REQUEST_REJECTED,
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_SESSION_EST_REQ,
+			.sequence_nr = 7,
+			.seid_present = true,
+			.seid = 0,
+		},
+		.ies.session_est_req = {
+			.node_id = {
+				.type = OSMO_PFCP_NODE_ID_T_IPV4,
+				.ip.u.sin = {
+					.sin_family = AF_INET,
+					.sin_addr = { 0x0100007f },
+				},
+			},
+			.cp_f_seid_present = true,
+			.cp_f_seid = f_seid,
+			.create_pdr_count = 2,
+			.create_pdr = {
+				{
+					.pdr_id = 1,
+					.precedence = 255,
+					.pdi = {
+						.source_iface = OSMO_PFCP_SOURCE_IFACE_CORE,
+						.ue_ip_address_present = true,
+						.ue_ip_address = {
+							.ip_is_destination = true,
+							.ip_addr = {
+								.v4_present = true,
+								.v4 = v4_ue,
+							},
+						},
+					},
+					.far_id_present = true,
+					.far_id = 1,
+				},
+				{
+					.pdr_id = 2,
+					.precedence = 255,
+					.pdi = {
+						.source_iface = OSMO_PFCP_SOURCE_IFACE_ACCESS,
+						.local_f_teid_present = true,
+						.local_f_teid = f_teid_access_local,
+					},
+					.outer_header_removal_present = true,
+					.outer_header_removal = {
+						.desc = OSMO_PFCP_OUTER_HEADER_REMOVAL_GTP_U_UDP_IPV4,
+					},
+					.far_id_present = true,
+					.far_id = 2,
+				},
+			},
+			.create_far_count = 2,
+			.create_far = {
+				{
+					.far_id = 1,
+					.forw_params_present = true,
+					.forw_params = {
+						.destination_iface = OSMO_PFCP_DEST_IFACE_ACCESS,
+						.outer_header_creation_present = true,
+						.outer_header_creation = ohc_access,
+					},
+					.apply_action = aa_forw,
+				},
+				{
+					.far_id = 2,
+					.forw_params_present = true,
+					.forw_params = {
+						.destination_iface = OSMO_PFCP_DEST_IFACE_CORE,
+					},
+					.apply_action = aa_forw,
+				},
+			},
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_SESSION_EST_RESP,
+			.sequence_nr = 8,
+			.seid_present = true,
+			.seid = 0x0123456789abcdef,
+		},
+		.ies.session_est_resp = {
+			.node_id = {
+				.type = OSMO_PFCP_NODE_ID_T_IPV4,
+				.ip.u.sin = {
+					.sin_family = AF_INET,
+					.sin_addr = { 0x0200007f },
+				},
+			},
+			.cause = OSMO_PFCP_CAUSE_REQUEST_ACCEPTED,
+			.up_f_seid_present = true,
+			.up_f_seid = f_seid,
+			.created_pdr_count = 2,
+			.created_pdr = {
+				{
+					.pdr_id = 1,
+				},
+				{
+					.pdr_id = 2,
+					.local_f_teid_present = true,
+					.local_f_teid = f_teid_created,
+				},
+			},
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_SESSION_MOD_REQ,
+			.sequence_nr = 9,
+			.seid_present = true,
+			.seid = 0,
+		},
+		.ies.session_mod_req = {
+			.remove_pdr_count = 1,
+			.remove_pdr = {
+				{
+					.pdr_id = 1,
+				},
+			},
+			.remove_far_count = 1,
+			.remove_far = {
+				{
+					.far_id = 1,
+				},
+			},
+			.create_pdr_count = 1,
+			.create_pdr = {
+				{
+					.pdr_id = 3,
+					.precedence = 255,
+					.pdi = {
+						.source_iface = OSMO_PFCP_SOURCE_IFACE_ACCESS,
+						.local_f_teid_present = true,
+						.local_f_teid = f_teid_access_local,
+					},
+					.outer_header_removal_present = true,
+					.outer_header_removal = {
+						.desc = OSMO_PFCP_OUTER_HEADER_REMOVAL_GTP_U_UDP_IPV4,
+					},
+					.far_id_present = true,
+					.far_id = 3,
+				},
+			},
+			.create_far_count = 1,
+			.create_far = {
+				{
+					.far_id = 3,
+					.forw_params_present = true,
+					.forw_params = {
+						.destination_iface = OSMO_PFCP_DEST_IFACE_ACCESS,
+						.outer_header_creation_present = true,
+						.outer_header_creation = ohc_access,
+					},
+					.apply_action = aa_forw,
+				},
+			},
+			.upd_pdr_count = 1,
+			.upd_pdr = {
+				{
+					.pdr_id = 1,
+					.pdi = {
+						.source_iface = OSMO_PFCP_SOURCE_IFACE_ACCESS,
+						.local_f_teid_present = true,
+						.local_f_teid = f_teid_access_local,
+					},
+					.outer_header_removal_present = true,
+					.outer_header_removal = {
+						.desc = OSMO_PFCP_OUTER_HEADER_REMOVAL_GTP_U_UDP_IPV4,
+					},
+					.far_id_present = true,
+					.far_id = 1,
+				},
+			},
+			.upd_far_count = 1,
+			.upd_far = {
+				{
+					.far_id = 1,
+					.upd_forw_params_present = true,
+					.upd_forw_params = {
+						.destination_iface = OSMO_PFCP_DEST_IFACE_CORE,
+						.network_inst_present = true,
+						.network_inst = {
+							.str = "internet",
+						},
+					},
+					.apply_action = aa_forw,
+				},
+			},
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_SESSION_MOD_RESP,
+			.sequence_nr = 10,
+			.seid_present = true,
+			.seid = 0x0123456789abcdef,
+		},
+		.ies.session_mod_resp = {
+			.cause = OSMO_PFCP_CAUSE_REQUEST_ACCEPTED,
+			.created_pdr_count = 1,
+			.created_pdr = {
+				{
+					.pdr_id = 3,
+					.local_f_teid_present = true,
+					.local_f_teid = f_teid_created,
+				},
+			},
+			.updated_pdr_count = 1,
+			.updated_pdr = {
+				{
+					.pdr_id = 1,
+					.local_f_teid_present = true,
+					.local_f_teid = f_teid_created,
+				},
+			},
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_SESSION_MOD_RESP,
+			.sequence_nr = 11,
+			.seid_present = true,
+			.seid = 0x0123456789abcdef,
+		},
+		.ies.session_mod_resp = {
+			.cause = OSMO_PFCP_CAUSE_MANDATORY_IE_MISSING,
+			.offending_ie_present = true,
+			.offending_ie = OSMO_PFCP_IEI_APPLY_ACTION,
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_SESSION_DEL_REQ,
+			.sequence_nr = 12,
+			.seid_present = true,
+			.seid = 0x0123456789abcdef,
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_SESSION_DEL_RESP,
+			.sequence_nr = 13,
+			.seid_present = true,
+			.seid = 0x0123456789abcdef,
+		},
+		.ies.session_del_resp = {
+			.cause = OSMO_PFCP_CAUSE_NO_ESTABLISHED_PFCP_ASSOC,
+		},
+	},
+	{
+		.h = {
+			.version = 1,
+			.message_type = OSMO_PFCP_MSGT_SESSION_DEL_RESP,
+			.sequence_nr = 13,
+			.seid_present = true,
+			.seid = 0x0123456789abcdef,
+		},
+		.ies.session_del_resp = {
+			.cause = OSMO_PFCP_CAUSE_REQUEST_ACCEPTED,
+		},
+	},
+};
+
+void test_enc_dec()
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(tests); i++) {
+		void *loop_ctx = talloc_named_const(ctx, 0, "loop");
+		int rc;
+		const struct osmo_pfcp_msg *orig = &tests[i];
+		struct osmo_pfcp_msg parsed = {};
+		struct msgb *msg;
+		struct osmo_gtlv_load tlv;
+
+		printf("\n=== start %s[%d]\n", __func__, i);
+		printf("encoding: %s\n", osmo_pfcp_message_type_str(orig->h.message_type));
+		printf("%s\n", osmo_pfcp_msg_to_str_c(loop_ctx, orig));
+		msg = msgb_alloc(1024, __func__),
+		rc = osmo_pfcp_msg_encode(msg, orig);
+		printf("osmo_pfcp_msg_encode() rc = %d\n", rc);
+		printf("%s.\n", osmo_hexdump(msg->data, msg->len));
+
+		rc = osmo_pfcp_msg_decode_header(&tlv, &parsed, msg);
+		printf("osmo_pfcp_msg_decode_header() rc = %d\n", rc);
+		if (rc != msgb_length(msg)) {
+			printf("ERROR: expected rc = %d\n", msgb_length(msg));
+			exit(1);
+		} else {
+			printf("rc == msgb_length()\n");
+		}
+
+		rc = osmo_pfcp_msg_decode_tlv(&parsed, &tlv);
+		printf("osmo_pfcp_msg_decode_tlv() rc = %d\n", rc);
+
+		if (strcmp(osmo_pfcp_msg_to_str_c(loop_ctx, orig),
+			   osmo_pfcp_msg_to_str_c(loop_ctx, &parsed))) {
+			printf(" ERROR: parsed != orig\n");
+			printf("   orig: %s\n",
+			       osmo_pfcp_msg_to_str_c(loop_ctx, orig));
+			printf(" parsed: %s\n",
+			       osmo_pfcp_msg_to_str_c(loop_ctx, &parsed));
+			exit(1);
+		} else {
+			printf("parsed == orig\n");
+		}
+
+		msgb_free(msg);
+		printf("=== end %s[%d]\n", __func__, i);
+		talloc_free(loop_ctx);
+	}
+}
+
+int main()
+{
+	ctx = talloc_named_const(NULL, 0, "pfcp_test");
+	msgb_talloc_ctx_init(ctx, 0);
+
+	test_enc_dec();
+
+	talloc_free(ctx);
+	return 0;
+}

tests/libosmo-pfcp/pfcp_test.ok

@@ -0,0 +1,154 @@
+
+=== start test_enc_dec[0]
+encoding: HEARTBEAT_REQ
+PFCPv1 HEARTBEAT_REQ hdr={seq=1} ies={ 'Recovery Time Stamp'=1234 }
+osmo_pfcp_msg_encode() rc = 0
+20 01 00 0c 00 00 01 00 00 60 00 04 00 00 04 d2 .
+osmo_pfcp_msg_decode_header() rc = 16
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[0]
+
+=== start test_enc_dec[1]
+encoding: HEARTBEAT_RESP
+PFCPv1 HEARTBEAT_RESP hdr={seq=2} ies={ 'Recovery Time Stamp'=5678 }
+osmo_pfcp_msg_encode() rc = 0
+20 02 00 0c 00 00 02 00 00 60 00 04 00 00 16 2e .
+osmo_pfcp_msg_decode_header() rc = 16
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[1]
+
+=== start test_enc_dec[2]
+encoding: ASSOC_SETUP_REQ
+PFCPv1 ASSOC_SETUP_REQ hdr={seq=3} ies={ 'Node ID'=v4:4.3.2.1 'Recovery Time Stamp'=724249387 }
+osmo_pfcp_msg_encode() rc = 0
+20 05 00 15 00 00 03 00 00 3c 00 05 00 04 03 02 01 00 60 00 04 2b 2b 2b 2b .
+osmo_pfcp_msg_decode_header() rc = 25
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[2]
+
+=== start test_enc_dec[3]
+encoding: ASSOC_SETUP_RESP
+PFCPv1 ASSOC_SETUP_RESP hdr={seq=4} ies={ 'Node ID'=fqdn:"example.com" 'Cause'=Request accepted (success) 'Recovery Time Stamp'=724249387 'UP Function Features'=( BUCP PDIU ) }
+osmo_pfcp_msg_encode() rc = 0
+20 06 00 2b 00 00 04 00 00 3c 00 0c 02 65 78 61 6d 70 6c 65 2e 63 6f 6d 00 13 00 01 01 00 60 00 04 2b 2b 2b 2b 00 2b 00 06 01 02 00 00 00 00 .
+osmo_pfcp_msg_decode_header() rc = 47
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[3]
+
+=== start test_enc_dec[4]
+encoding: ASSOC_RELEASE_REQ
+PFCPv1 ASSOC_RELEASE_REQ hdr={seq=5} ies={ 'Node ID'=v6:[102:304::] }
+osmo_pfcp_msg_encode() rc = 0
+20 09 00 19 00 00 05 00 00 3c 00 11 01 01 02 03 04 00 00 00 00 00 00 00 00 00 00 00 00 .
+osmo_pfcp_msg_decode_header() rc = 29
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[4]
+
+=== start test_enc_dec[5]
+encoding: ASSOC_RELEASE_RESP
+PFCPv1 ASSOC_RELEASE_RESP hdr={seq=6} ies={ 'Node ID'=v4:4.3.2.1 'Cause'=Request rejected (reason not specified) }
+osmo_pfcp_msg_encode() rc = 0
+20 0a 00 12 00 00 06 00 00 3c 00 05 00 04 03 02 01 00 13 00 01 40 .
+osmo_pfcp_msg_decode_header() rc = 22
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[5]
+
+=== start test_enc_dec[6]
+encoding: SESSION_EST_REQ
+PFCPv1 SESSION_EST_REQ hdr={seq=7 SEID=0x0} ies={ 'Node ID'=v4:127.0.0.1 'F-SEID'=0x1234567890abcdef,v4:10.9.8.7 'Create PDR'={ { 'PDR ID'=1 'Precedence'=255 'PDI'={ 'Source Interface'=Core 'UE IP Address'=,dst,v4:192.168.0.23 } 'FAR ID'=1 }, { 'PDR ID'=2 'Precedence'=255 'PDI'={ 'Source Interface'=Access 'F-TEID'=CHOOSE-v4 } 'Outer Header Removal'=GTP_U_UDP_IPV4 'FAR ID'=2 } } 'Create FAR'={ { 'FAR ID'=1 'Apply Action'=( FORW ) 'Forwarding Parameters'={ 'Destination Interface'=Access 'Outer Header Creation'=( GTP_U_UDP_IPV4 ),TEID:0xabcdef,v4:10.9.8.7 } }, { 'FAR ID'=2 'Apply Action'=( FORW ) 'Forwarding Parameters'={ 'Destination Interface'=Core } } } }
+osmo_pfcp_msg_encode() rc = 0
+21 32 00 c3 00 00 00 00 00 00 00 00 00 00 07 00 00 3c 00 05 00 7f 00 00 01 00 39 00 0d 02 12 34 56 78 90 ab cd ef 0a 09 08 07 00 01 00 28 00 38 00 02 00 01 00 1d 00 04 00 00 00 ff 00 02 00 0e 00 14 00 01 01 00 5d 00 05 06 c0 a8 00 17 00 6c 00 04 00 00 00 01 00 01 00 29 00 38 00 02 00 02 00 1d 00 04 00 00 00 ff 00 02 00 0a 00 14 00 01 00 00 15 00 01 05 00 5f 00 01 00 00 6c 00 04 00 00 00 02 00 03 00 25 00 6c 00 04 00 00 00 01 00 2c 00 02 02 00 00 04 00 13 00 2a 00 01 00 00 54 00 0a 01 00 00 ab cd ef 0a 09 08 07 00 03 00 17 00 6c 00 04 00 00 00 02 00 2c 00 02 02 00 00 04 00 05 00 2a 00 01 01 .
+osmo_pfcp_msg_decode_header() rc = 199
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[6]
+
+=== start test_enc_dec[7]
+encoding: SESSION_EST_RESP
+PFCPv1 SESSION_EST_RESP hdr={seq=8 SEID=0x123456789abcdef} ies={ 'Node ID'=v4:127.0.0.2 'Cause'=Request accepted (success) 'F-SEID'=0x1234567890abcdef,v4:10.9.8.7 'Created PDR'={ { 'PDR ID'=1 }, { 'PDR ID'=2 'F-TEID'=TEID-0x4d2,v4:10.9.8.7 } } }
+osmo_pfcp_msg_encode() rc = 0
+21 33 00 4c 01 23 45 67 89 ab cd ef 00 00 08 00 00 3c 00 05 00 7f 00 00 02 00 13 00 01 01 00 39 00 0d 02 12 34 56 78 90 ab cd ef 0a 09 08 07 00 08 00 06 00 38 00 02 00 01 00 08 00 13 00 38 00 02 00 02 00 15 00 09 01 00 00 04 d2 0a 09 08 07 .
+osmo_pfcp_msg_decode_header() rc = 80
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[7]
+
+=== start test_enc_dec[8]
+encoding: SESSION_MOD_REQ
+PFCPv1 SESSION_MOD_REQ hdr={seq=9 SEID=0x0} ies={ 'Remove PDR'={ { 'PDR ID'=1 } } 'Remove FAR'={ { 'FAR ID'=1 } } 'Create PDR'={ { 'PDR ID'=3 'Precedence'=255 'PDI'={ 'Source Interface'=Access 'F-TEID'=CHOOSE-v4 } 'Outer Header Removal'=GTP_U_UDP_IPV4 'FAR ID'=3 } } 'Create FAR'={ { 'FAR ID'=3 'Apply Action'=( FORW ) 'Forwarding Parameters'={ 'Destination Interface'=Access 'Outer Header Creation'=( GTP_U_UDP_IPV4 ),TEID:0xabcdef,v4:10.9.8.7 } } } 'Update PDR'={ { 'PDR ID'=1 'Outer Header Removal'=GTP_U_UDP_IPV4 'FAR ID'=1 } } 'Update FAR'={ { 'FAR ID'=1 'Update Forwarding Parameters'={ 'Network Instance'="internet" } } } }
+osmo_pfcp_msg_encode() rc = 0
+21 34 00 ab 00 00 00 00 00 00 00 00 00 00 09 00 00 0f 00 06 00 38 00 02 00 01 00 10 00 08 00 6c 00 04 00 00 00 01 00 01 00 29 00 38 00 02 00 03 00 1d 00 04 00 00 00 ff 00 02 00 0a 00 14 00 01 00 00 15 00 01 05 00 5f 00 01 00 00 6c 00 04 00 00 00 03 00 03 00 25 00 6c 00 04 00 00 00 03 00 2c 00 02 02 00 00 04 00 13 00 2a 00 01 00 00 54 00 0a 01 00 00 ab cd ef 0a 09 08 07 00 09 00 13 00 38 00 02 00 01 00 5f 00 01 00 00 6c 00 04 00 00 00 01 00 0a 00 18 00 6c 00 04 00 00 00 01 00 0b 00 0c 00 16 00 08 69 6e 74 65 72 6e 65 74 .
+osmo_pfcp_msg_decode_header() rc = 175
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[8]
+
+=== start test_enc_dec[9]
+encoding: SESSION_MOD_RESP
+PFCPv1 SESSION_MOD_RESP hdr={seq=10 SEID=0x123456789abcdef} ies={ 'Cause'=Request accepted (success) 'Created PDR'={ { 'PDR ID'=3 'F-TEID'=TEID-0x4d2,v4:10.9.8.7 } } 'Updated PDR'={ { 'PDR ID'=1 'F-TEID'=TEID-0x4d2,v4:10.9.8.7 } } }
+osmo_pfcp_msg_encode() rc = 0
+21 35 00 3f 01 23 45 67 89 ab cd ef 00 00 0a 00 00 13 00 01 01 00 08 00 13 00 38 00 02 00 03 00 15 00 09 01 00 00 04 d2 0a 09 08 07 01 00 00 13 00 38 00 02 00 01 00 15 00 09 01 00 00 04 d2 0a 09 08 07 .
+osmo_pfcp_msg_decode_header() rc = 67
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[9]
+
+=== start test_enc_dec[10]
+encoding: SESSION_MOD_RESP
+PFCPv1 SESSION_MOD_RESP hdr={seq=11 SEID=0x123456789abcdef} ies={ 'Cause'=Mandatory IE missing 'Offending IE'=Apply Action }
+osmo_pfcp_msg_encode() rc = 0
+21 35 00 17 01 23 45 67 89 ab cd ef 00 00 0b 00 00 13 00 01 42 00 28 00 02 00 2c .
+osmo_pfcp_msg_decode_header() rc = 27
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[10]
+
+=== start test_enc_dec[11]
+encoding: SESSION_DEL_REQ
+PFCPv1 SESSION_DEL_REQ hdr={seq=12 SEID=0x123456789abcdef} ies={ }
+osmo_pfcp_msg_encode() rc = 0
+21 36 00 0c 01 23 45 67 89 ab cd ef 00 00 0c 00 .
+osmo_pfcp_msg_decode_header() rc = 16
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[11]
+
+=== start test_enc_dec[12]
+encoding: SESSION_DEL_RESP
+PFCPv1 SESSION_DEL_RESP hdr={seq=13 SEID=0x123456789abcdef} ies={ 'Cause'=No established PFCP Association }
+osmo_pfcp_msg_encode() rc = 0
+21 37 00 11 01 23 45 67 89 ab cd ef 00 00 0d 00 00 13 00 01 48 .
+osmo_pfcp_msg_decode_header() rc = 21
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[12]
+
+=== start test_enc_dec[13]
+encoding: SESSION_DEL_RESP
+PFCPv1 SESSION_DEL_RESP hdr={seq=13 SEID=0x123456789abcdef} ies={ 'Cause'=Request accepted (success) }
+osmo_pfcp_msg_encode() rc = 0
+21 37 00 11 01 23 45 67 89 ab cd ef 00 00 0d 00 00 13 00 01 01 .
+osmo_pfcp_msg_decode_header() rc = 21
+rc == msgb_length()
+osmo_pfcp_msg_decode_tlv() rc = 0
+parsed == orig
+=== end test_enc_dec[13]

tests/testsuite.at

@@ -1,2 +1,32 @@
 AT_INIT
 AT_BANNER([Regression tests.])
+
+AT_SETUP([gtlv])
+AT_KEYWORDS([gtlv])
+cat $abs_srcdir/libosmo-gtlv/gtlv_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/libosmo-gtlv/gtlv_test], [], [expout], [ignore])
+AT_CLEANUP
+
+AT_SETUP([gtlv_dec_enc])
+AT_KEYWORDS([gtlv_dec_enc])
+cat $abs_srcdir/libosmo-gtlv/gtlv_dec_enc_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/libosmo-gtlv/gtlv_dec_enc_test], [], [expout], [ignore])
+AT_CLEANUP
+
+AT_SETUP([gtlv_gen])
+AT_KEYWORDS([gtlv_gen])
+cat $abs_srcdir/libosmo-gtlv/test_gtlv_gen/gtlv_gen_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/libosmo-gtlv/test_gtlv_gen/gtlv_gen_test], [], [expout], [ignore])
+AT_CLEANUP
+
+AT_SETUP([tliv])
+AT_KEYWORDS([tliv])
+cat $abs_srcdir/libosmo-gtlv/test_tliv/tliv_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/libosmo-gtlv/test_tliv/tliv_test], [], [expout], [ignore])
+AT_CLEANUP
+
+AT_SETUP([pfcp])
+AT_KEYWORDS([pfcp])
+cat $abs_srcdir/libosmo-pfcp/pfcp_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/libosmo-pfcp/pfcp_test], [], [expout], [ignore])
+AT_CLEANUP

tests/upf.vty

@@ -23,13 +23,13 @@ OsmoUPF(config-gtp)# list
 OsmoUPF(config-gtp)# dev?
   dev  Configure the GTP device to use for encaps/decaps.
 OsmoUPF(config-gtp)# dev ?
-  create  Add GTP device, creating a new Linux kernel GTP device. Will listen on GTPv1 port 2152 and GTPv0 port 3386 on the specified interface, or on ANY if LISTEN_ADDR is omitted.
-  use     Add GTP device, using an existing Linux kernel GTP device, e.g. created by 'gtp-link'
-  delete  Remove a GTP device from the configuration, and delete the Linux kernel GTP device if it was created here.
+  create  create a new GTP device. Will listen on GTPv1 port 2152 and GTPv0 port 3386 on the specified interface, or on ANY if LISTEN_ADDR is omitted.
+  use     use an existing GTP device, e.g. created by 'gtp-link'
+  delete  Remove a GTP device from the configuration, and delete the device if it was created here.
 OsmoUPF(config-gtp)# dev create ?
   DEVNAME  device name, e.g. 'apn0'
 OsmoUPF(config-gtp)# dev create foo ?
-  [LISTEN_ADDR]  IPv4 or IPv6 address to listen on, omit for ANY
+  [LISTEN_ADDR]  IPv4 or IPv6 address to listen on, omit for any
 OsmoUPF(config-gtp)# dev delete ?
   DEVNAME  device name, e.g. 'apn0'
 OsmoUPF(config-gtp)# exit