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.
The evolution would be to introduce libosmocore and start using
the logging framework. But even then we can map this option to
the file target.
Fixes: SYS#263
cmdline.c: In function ‘cmdline_parser_internal’:
cmdline.c:588:7: warning: variable ‘check_required’ set but not used [-Wunused-but-set-variable]
int check_required;
^
struct gtp0_header needs __attribute__((packed)) to make sure that
gcc doesn't add a hole of 4 bytes to align the 64-bits teid, resulting
in 24 bytes instead of 20 bytes. This was breaking gtpv0 in my gprs
testbed with my x86_64 laptop.
While at it, add also attribute packed to other headers just to
make sure that gcc doesn't pad the structures with holes.
This is fixing various compiler warnings:
In file included from sgsn_libgtp.c:49:0:
include/gtp.h:397:48: warning: ‘struct ul66_t’ declared inside parameter list [enabled by default]
include/gtp.h:397:48: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
include/gtp.h:398:49: warning: ‘struct ul66_t’ declared inside parameter list [enabled by default]
include/gtp.h:399:53: warning: ‘struct ul16_t’ declared inside parameter list [enabled by default]
include/gtp.h:400:53: warning: ‘struct ul16_t’ declared inside parameter list [enabled by default]
include/gtp.h:397:48: warning: ‘struct ul66_t’ declared inside parameter list [enabled by default]
include/gtp.h:397:48: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
include/gtp.h:398:49: warning: ‘struct ul66_t’ declared inside parameter list [enabled by default]
include/gtp.h:399:53: warning: ‘struct ul16_t’ declared inside parameter list [enabled by default]
include/gtp.h:400:53: warning: ‘struct ul16_t’ declared inside parameter list [enabled by default]
We are not using this option in any of our projects and it is breaking
make distclean. Remove the option for now.
make[2]: Entering directory `/openggsn-0.91/_build/ggsn'
Makefile:307: ../lib/.deps/getopt.Po: No such file or directory
Makefile:308: ../lib/.deps/getopt1.Po: No such file or directory
make[2]: *** No rule to make target `../lib/.deps/getopt1.Po'. Stop.
Attached is a trivial patch to make
"dpkg-buildpackage -rfakeroot -uc -us"
work out of the box.
Tested on ubuntu 12.04 x86_64 but should work on any debian-based
distro.
After so many years of silence, we don't expect the original author to
return to the project. To make things a bit simpler for us, we convert
the coding style to what we are used to (Linux style).
The conversion was made using the 'Lindent' script which is part of the
Linux kernel.
According to 3GPP TS 29.060 recovery is optional, add command line option --norecovery to remove this field in sgsnemu
Signed-off-by: Yann BONNAMY <yann_bonnamy@yahoo.fr>
Signed-off-by: Harald Welte <laforge@gnumonks.org>
Routing Area Information is an optional Field described in 3GPP TS 29.060 7.7.3
it can be added with command line option rai, in the dot separated format MCC.MNC.LAC.RAC
example : --rai 208.10.65535.255
Signed-off-by: Yann BONNAMY <yann_bonnamy@yahoo.fr>
Signed-off-by: Harald Welte <laforge@gnumonks.org>
this patch allows to tweak any bit of the QoS field of the Create PDP context generated by sgsnemu , aligned with 10.5.6.5 of 3GPP TS 24.008 V10.0.0 (2010-09)
QoS field can be extended to "lenght 12" with option --qose1, as seen in real life on UMTS networks.
extension to lenght 13, 15 and 17 can be done with option --qose2, --qose3, --qose4, never seen IRL but allows to test 3GPP compliance of GGSN.
Signed-off-by: Yann BONNAMY <yann_bonnamy@yahoo.fr>
I use OpenGGSN to create/update/delete PDP context and I found a bug
in the implementation: when the sgsnemu sends an "update PDP context"
request, it receives back a "create PDP context" response. Below is
the correction I made, I hope it helps.
This adds support for the followng new GTP Information Elements:
RAT_TYPE, USER_LOC, MS_TZ, IMEI_SV
Furthermore, it allows to specify those fields as sgsnemu command line
arguments.
* Change arguments of tun_gifindex from:
int tun_gifindex(struct tun_t *this, int *index)
to
int tun_gifindex(struct tun_t *this, __u32 *index)
solves:
../lib/tun.c: In function ‘tun_addaddr’:
../lib/tun.c:265: warning: pointer targets in passing argument 2 of
‘tun_gifindex’ differ in signedness
../lib/tun.c:88: note: expected ‘int *’ but argument is of type ‘__u32
*’
* handle system return code and returns -1 if system failed
solves:
../lib/tun.c: In function ‘tun_runscript’:
../lib/tun.c:895: warning: ignoring return value of ‘system’, declared
with attribute warn_unused_result
* do not dereference a pointer cast and use it as an lvalue
see
http://www.mail-archive.com/svn-commits@lists.digium.com/msg50931.html
solves:
../lib/tun.c: In function ‘tun_route’:
../lib/tun.c:533: warning: dereferencing pointer ‘({anonymous})’ does
break strict-aliasing rules
../lib/tun.c:533: note: initialized from here
../lib/tun.c:534: warning: dereferencing pointer ‘({anonymous})’ does
break strict-aliasing rules
../lib/tun.c:534: note: initialized from here
../lib/tun.c:535: warning: dereferencing pointer ‘({anonymous})’ does
break strict-aliasing rules
../lib/tun.c:535: note: initialized from here
../lib/tun.c: In function ‘tun_setaddr’:
../lib/tun.c:435: warning: dereferencing pointer ‘({anonymous})’ does
break strict-aliasing rules
../lib/tun.c:435: note: initialized from here
../lib/tun.c:452: warning: dereferencing pointer ‘({anonymous})’ does
break strict-aliasing rules
../lib/tun.c:452: note: initialized from here
../lib/tun.c:465: warning: dereferencing pointer ‘({anonymous})’ does
break strict-aliasing rules
../lib/tun.c:465: note: initialized from here
Signed-off-by: Emmanuel Bretelle <chantra@debuntu.org>
Relevant output from make:
../lib/tun.c: In function ‘tun_new’:
../lib/tun.c:688: warning: array subscript is above array bounds
Caused by assignement:
(*tun)->devname[IFNAMSIZ] = 0;
while devname defined as:
char devname[IFNAMSIZ];
Signed-off-by: Emmanuel Bretelle <chantra@debuntu.org>
Some files like in sgsnemu and ggsn directory where exactly the same.
They are now moved to the same directory for easier maintenance
Signed-off-by: Emmanuel Bretelle <chantra@debuntu.org>
Relevant output of make:
sgsnemu.c: In function ‘process_options’:
sgsnemu.c:443: warning: pointer targets in passing argument 1 of
‘strncpy’ differ in signedness
/usr/include/bits/string3.h:120: note: expected ‘char * __restrict__’
but argument is of type ‘unsigned char *’
Signed-off-by: Emmanuel Bretelle <chantra@debuntu.org>
Relevant output of make:
ggsn.c: In function ‘main’:
ggsn.c:436: warning: ignoring return value of ‘freopen’, declared with
attribute warn_unused_result
ggsn.c:437: warning: ignoring return value of ‘freopen’, declared with
attribute warn_unused_result
ggsn.c:438: warning: ignoring return value of ‘freopen’, declared with
attribute warn_unused_result
ggsn.c:439: warning: ignoring return value of ‘daemon’, declared with
attribute warn_unused_result
Signed-off-by: Emmanuel Bretelle <chantra@debuntu.org>
Relevant output of make:
gtp.c: In function ‘log_restart’:
gtp.c:697: warning: ignoring return value of ‘fscanf’, declared with
attribute warn_unused_result
Signed-off-by: Emmanuel Bretelle <chantra@debuntu.org>
Pablo Neira Ayuso
Harald Welte
Sylvain Munaut