[RFC,net-next, 0/4] seg6: add support for SRv6 End.DT4 behavior

[Andrea Mayer]

This patchset adds support for the SRv6 End.DT4 behavior.

The SRv6 End.DT4 is used to implement multi-tenant IPv4 L3VPN. It decapsulates
the received packets and performs IPv4 routing lookup in the routing table of
the tenant. The SRv6 End.DT4 Linux implementation leverages a VRF device. SRv6
End.DT4 is defined in the SRv6 Network Programming [1].

- Patch 1/4 is needed to solve a pre-existing issue with tunneled packets
  when a sniffer is attached;

- Patch 2/4 introduces two callbacks used for customizing the
  creation/destruction of a SRv6 behavior;

- Patch 3/4 is the core patch that adds support for the SRv6 End.DT4 behavior;

- Patch 4/4 adds the selftest for SRv6 End.DT4.

I would like to thank David Ahern for his support during the development of
this patch set.

Comments, suggestions and improvements are very welcome!

Thanks,
Andrea Mayer

[1] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming

Andrea Mayer (4):
  vrf: push mac header for tunneled packets when sniffer is attached
  seg6: add callbacks for customizing the creation/destruction of a
    behavior
  seg6: add support for the SRv6 End.DT4 behavior
  add selftest for the SRv6 End.DT4 behavior

 drivers/net/vrf.c                             |  78 ++-
 net/ipv6/seg6_local.c                         | 261 ++++++++++
 .../selftests/net/srv6_end_dt4_l3vpn_test.sh  | 490 ++++++++++++++++++
 3 files changed, 823 insertions(+), 6 deletions(-)
 create mode 100755 tools/testing/selftests/net/srv6_end_dt4_l3vpn_test.sh

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2.20.1