tree 464bb5997e48299eac0bcd2cb249e4af2985aba5
parent dea76a00691b85e91c04fb4d3aef3d8325e5fb9a
author Pablo Neira Ayuso <pablo@gnumonks.org> 1393238332 +0100
committer Pablo Neira Ayuso <pablo@gnumonks.org> 1393238511 +0100

allow to specify the interface name for the GTP device

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.