This patch corresponds to a Linux kernel patch extending the kernel GTP
to also cover the SGSN role, not just the GGSN role. In order to keep
the API/behavior compatible, gtp_dev_create() will continue to create
GGSN-side tunnels, while a new gtp_dev_create_sgsn() is introduced to
create SGSN-side tunnels.
Signed-off-by: Harald Welte <laforge@gnumonks.org>
So we can fully test packet decapsulation without a full blown openggsn
setup by injecting packets and using this simple tool.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Andreas accidentally broke parsing, restore it.
Fixes: ba77a20 ("gtp-rtnl: Split TID handling for GTPv0 and GTPv1")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
gtp_list_tunnel() is exported through the library, so use it instead of
opencode. This is a left-over from the early stage of development of
libgtpnl.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
GTPv1 tunnel use separate 32bit Tunnel Endpoint Identifier's for each
direction while GTPv0 uses only one 64bit Tunnel IDentifier.
Signed-off-by: Andreas Schultz <aschultz@tpip.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
We can use this to specify 'gtp0' from openggsn, so we make sure that
it always uses the same tunnel device on creation. If it already exists,
it will return EEXIST. This is used to skip the problem of lacking
NLM_F_ECHO in the rtnetlink link interface that allows us to know the
name of the gtp device that has been dynamically allocated from the
kernel.
And, finally, I don't find any use case for having more than one tunnel
device when integrating this with openggsn.
This patch also adjusts tools/gtp-link-add.c which needs some care, since
it is not yet using any of the library functions. This tools are likely
to be useful for troubleshooting and debugging.
This patch adds the libgtpnl library. Harald mentioned that he wanted
that the specific code that is added is well encapsulated, so let's
start a small library to interact with the GTP kernel module via netlink
interface.
This was done a bit while in the rush, so the interfaces are not nice
at all and the tools need to be ported on top of this library.
This library will be used to integrate openggsn with the GTP kernel
module.
Harald Welte
Pablo Neira Ayuso