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4b075b6cb85f93dff1378aabddf7c1d4959feb72
osmo-ggsn/configure.ac
Pablo Neira Ayuso 4b075b6cb8 ggsn: add support for GTP kernel data encapsulation 
This patch adds the -g, --gtpnl=device option that allows you to
enable the GTP kernel tunneling mode in openggsn. You have to specify
the real downlink device that will be used to tunnel traffic, eg.

	-g=eth0

This means that the gtp0 device will be created and it will use eth0
as the real device to encapsulate packet coming from the Internet that
are addressed to the MS (so the tunnel devuce encapsulates these IP
packets in GTP packets when traveling to the SGSN).

Alternatively, you can also add this to the ggsn.conf configuration file:

	gtpnl eth0

The device has to be the real device that can route packets to the SGSN,
if you select the wrong device, the kernel routing code may not find a
way to reach the SSGN, you've been warned.

Therefore, if this option is set, the operational becomes the following:

1) A gtp0 device is created via rtnetlink and configure the socket
   encapsulation infrastructure in the kernel.
2) Whenever a PDP context is created, this adds the necessary tunnel
   configuration via genetlink GTP interface.
3) Whenever a PDP context is destroyed, this deletes the tunnel via
   genetlink GTP interface.
4) Destroy the gtp0 device if ggsn is stopped, including all of the
   existing tunnels.

You require the osmo-ggsn.git tree, which contains the kernel module
gtp.ko and the libgtpnl library that you have to compile and install.
Make sure you have loaded the gtp.ko kernel module before launching
the ggsn daemon using the kernel driver mode, otherwise you will get
a nice "operation not supported" error message ;-).

This patch also adds supports for "ipup" configuration option to invoke
an external script after the gtp0 device has been brought up. Typical
command to add the route to reach the MS behind the GGSN is required,
eg. ip route add 10.0.0.0/8 dev gtp0.

The (horrible) ggsn parser has been manually extended to support the
new configuration option. That code doesn't look nice, but it just
mimics what we already have there for consistency, please don't blame
me for that.

If you want to run in debugging mode, I suggest you to use:

	sudo ggsn -c ggsn.conf -f -d

Note that you do have to run openggsn as root to bring up the gtp0
device. You have to see this message that announce that the GTP kernel
mode is enabled.

openggsn[1106]: ggsn.c: 656: Using the GTP kernel mode (genl ID is 25)

This patch also automagically sets up route to reach MS from Internet
just like tun mode does. This is fundamental to get this working,
better don't leave to the admin, he may forget to add this route.

In this patch, I tried to encapsulate this new feature as much as
possible as Harald initially suggested.

To compile this feature, you have to pass --enable-gtp-kernel, ie.

./configire --enable-gtp-kernel

Otherwise, the code to interact with the gtp kernel part is not compiled.

Signed-off-by: Andreas Schultz <aschultz@tpip.net>
2015-12-21 08:37:11 +01:00

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# Process this file with autoconf to produce a configure script.
AC_INIT(openggsn, 0.92, laforge@gnumonks.org)
AC_CONFIG_SRCDIR([gtp/gtp.c])
AM_CONFIG_HEADER([config.h])
#AC_CONFIG_HEADER([config.h])
AC_CANONICAL_SYSTEM
dnl kernel style compile messages
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
# Checks for programs.
AC_PROG_CC
AC_PROG_INSTALL
AC_PROG_AWK
AC_PROG_CPP
AC_PROG_CXX
LT_INIT
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_LIBOBJ_DIR([lib])
AC_ARG_ENABLE(static-exec,
[ --enable-static-exec Enable static linking of executables],
[ EXEC_LDFLAGS="-all-static"])
AC_SUBST(EXEC_LDFLAGS)
case "${host}" in
i*86-*-linux-gnu*)
EXEC_LDADD="" ;;
*solaris*)
EXEC_LDADD="-lresolv -lsocket -lnsl" ;;
esac
AC_SUBST(EXEC_LDADD)
# Checks for libraries.
# FIXME: Replace `main' with a function in `-le':
#AC_CHECK_LIB([e], [main])
# FIXME: Replace `main' with a function in `-lgtp':
#AC_CHECK_LIB([gtp], [main])
# FIXME: Replace `main' with a function in `-links':
#AC_CHECK_LIB([inks], [main])
dnl GTP kernel dependencies
AC_ARG_ENABLE([gtp-kernel],
AS_HELP_STRING([--enable-gtp-kernel], [Build GTP tunneling kernel]),
[enable_gtp_kernel="$enableval"], [enable_gtp_kernel="no"])
if test "x$enable_gtp_kernel" = "xyes"; then
PKG_CHECK_MODULES([LIBGTPNL], [libgtpnl >= 1.0.0])
fi
AM_CONDITIONAL([ENABLE_GTP_KERNEL], [test "$enable_gtp_kernel" = "yes"])
# Checks for header files.
AC_HEADER_STDC
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS([arpa/inet.h fcntl.h netdb.h netinet/in.h stdint.h stdlib.h string.h sys/ioctl.h sys/socket.h sys/time.h unistd.h])
# Check for if header
AC_CHECK_HEADERS([linux/if.h net/if.h])
# Check for tun header
AC_CHECK_HEADERS([linux/if_tun.h net/if_tun.h])
# Check for netlink and rtnetlink headers
AC_CHECK_HEADERS([linux/netlink.h linux/rtnetlink.h])
# Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_MODE_T
AC_TYPE_SIZE_T
AC_HEADER_TIME
# check for ifaliasreq
AC_MSG_CHECKING(whether struct ifaliasreq exist)
AH_TEMPLATE(HAVE_IFALIASREQ)
AC_EGREP_HEADER(ifaliasreq, net/if.h,
[AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_IFALIASREQ])],
AC_MSG_RESULT(no))
# check for ifreq.ifru_netmask
AC_MSG_CHECKING(whether struct ifreq.ifru_netmask exist)
AH_TEMPLATE(HAVE_IFREQ_IFRU_NETMASK)
AC_EGREP_HEADER(ifru_netmask, linux/if.h,
[AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_IFREQ_IFRU_NETMASK])],
AC_MSG_RESULT(no))
# check for rt_msghdr
AC_MSG_CHECKING(whether struct rt_msghdr exist)
AH_TEMPLATE(HAVE_RT_MSGHDR)
AC_EGREP_HEADER(rt_msghdr, net/route.h,
[AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_RT_MSGHDR])],
AC_MSG_RESULT(no))
# Checks for library functions.
AC_PROG_GCC_TRADITIONAL
# AC_FUNC_MALLOC
# AC_FUNC_MEMCMP
AC_CHECK_FUNCS([gethostbyname inet_ntoa memset select socket strdup strerror strtol])
AC_CHECK_FUNCS(inet_aton inet_addr, break)
# check for getopt in standard library
adl_FUNC_GETOPT_LONG
AM_INIT_AUTOMAKE()
PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 0.6.4)
PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 0.3.0)
AC_CONFIG_FILES([Makefile
doc/Makefile
ggsn/Makefile
gtp/Makefile
lib/Makefile
intl/Makefile
po/Makefile
sgsnemu/Makefile
tests/Makefile
libgtp.pc
openggsn.spec])
AC_OUTPUT
echo "
openggsn Configuration:
GTP kernel support: ${enable_gtp_kernel}"
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