Attention is currently required from: neels, laforge.

neels uploaded patch set #9 to this change.

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implement GTP tunnel mapping via netfilter

Implement support for PFCP rulesets that ask for mapping a GTP tunnel:
forwarding GTP payload between two GTP tunnels.

For a GTP tunnel mapping, dispatch netfilter rules that detect GTP
packets with a given source address and TEID, and replace the TEID and
destination address according to the PFCP ruleset.

The netfilter implementation is chosen to effect the packet rewriting
and forwarding to take place directly in the kernel, for high throughput
of GTP packets.

Related: SYS#5599
Change-Id: Ic0d319eb4f98cd51a5999c804c4203ab0bdda650
---
M doc/examples/osmo-upf/osmo-upf-mockup.cfg
M include/osmocom/upf/upf.h
M include/osmocom/upf/upf_nft.h
M src/osmo-upf/Makefile.am
M src/osmo-upf/osmo_upf_main.c
M src/osmo-upf/up_gtp_action.c
M src/osmo-upf/up_session.c
M src/osmo-upf/upf.c
A src/osmo-upf/upf_nft.c
M src/osmo-upf/upf_vty.c
10 files changed, 455 insertions(+), 7 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-upf refs/changes/09/28309/9

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