tree 15f033e2ef882a7e374852f34843c833719dbc19
parent 41ff538fb43e7c5c64bc00eabc5d388179f4662a
author Pablo Neira Ayuso <pablo@gnumonks.org> 1393188942 +0100
committer Pablo Neira Ayuso <pablo@netfilter.org> 1393193399 +0100

gtp: create socket from userspace and pass them as configuration

openggsn already sets up the UDP sockets that we need for the control
and user planes of GTP. Since we cannot bind two UDP sockets (one from
userspace and another from the kernel) to the same port, change the
current code to pass the socket descriptors that has been allocated
by openggsn (or whatever daemon which uses the GTP kernel
infrastructure).

Two new attributes are added to set up the tunnel device: IFLA_GTP_FD0
(for GTP0) and IFLA_GTP_FD1 (for GTP1u), which specify the UDP socket
created from userspace. Thus, the GTP kernel code only takes care of
enabling the kernel UDP encapsulation routine.