[PATCH net-next 00/11] ICMP error handling for UDP tunnels

[Stefano Brivio <sbrivio@redhat.com>]

This series introduces ICMP error handling for UDP tunnels and
encapsulations and related selftests. We need to handle ICMP errors to
support PMTU discovery and route redirection -- this support is entirely
missing right now:

- patch 1/11 adds a socket lookup for UDP tunnels that use, by design,
  the same destination port on both endpoints -- i.e. VxLAN and GENEVE
- patches 2/11 to 7/11 are specific to VxLAN and GENEVE
- patches 8/11 and 9/11 add infrastructure for lookup of encapsulations
  where sent packets cannot be matched via receiving socket lookup, i.e.
  FoU and GUE
- patches 10/11 and 11/11 are specific to FoU and GUE

Stefano Brivio (11):
  udp: Handle ICMP errors for tunnels with same destination port on both
    endpoints
  vxlan: ICMP error lookup handler
  vxlan: Allow configuration of DF behaviour
  selftests: pmtu: Introduce tests for IPv4/IPv6 over VxLAN over IPv6
  geneve: ICMP error lookup handler
  geneve: Allow configuration of DF behaviour
  selftests: pmtu: Introduce tests for IPv4/IPv6 over GENEVE over IPv6
  net: Convert protocol error handlers from void to int
  udp: Support for error handlers of tunnels with arbitrary destination
    port
  fou, fou6: ICMP error handlers for FoU and GUE
  selftests: pmtu: Introduce FoU and GUE PMTU exceptions tests

 drivers/net/geneve.c                | 104 ++++++++-
 drivers/net/vxlan.c                 |  58 +++++
 include/linux/udp.h                 |   1 +
 include/net/icmp.h                  |   2 +-
 include/net/ip6_tunnel.h            |   2 +
 include/net/ip_tunnels.h            |   1 +
 include/net/protocol.h              |   9 +-
 include/net/sctp/sctp.h             |   2 +-
 include/net/tcp.h                   |   2 +-
 include/net/udp.h                   |   2 +-
 include/net/udp_tunnel.h            |   3 +
 include/net/vxlan.h                 |   1 +
 include/uapi/linux/if_link.h        |  18 ++
 net/dccp/ipv4.c                     |  13 +-
 net/dccp/ipv6.c                     |  13 +-
 net/ipv4/fou.c                      |  68 ++++++
 net/ipv4/gre_demux.c                |   9 +-
 net/ipv4/icmp.c                     |   6 +-
 net/ipv4/ip_gre.c                   |  48 ++--
 net/ipv4/ipip.c                     |  14 +-
 net/ipv4/protocol.c                 |   1 +
 net/ipv4/tcp_ipv4.c                 |  22 +-
 net/ipv4/tunnel4.c                  |  18 +-
 net/ipv4/udp.c                      | 119 ++++++++--
 net/ipv4/udp_impl.h                 |   2 +-
 net/ipv4/udp_tunnel.c               |   1 +
 net/ipv4/udplite.c                  |   4 +-
 net/ipv4/xfrm4_protocol.c           |  18 +-
 net/ipv6/fou6.c                     |  74 +++++++
 net/ipv6/icmp.c                     |   4 +-
 net/ipv6/ip6_gre.c                  |  18 +-
 net/ipv6/tcp_ipv6.c                 |  13 +-
 net/ipv6/tunnel6.c                  |  12 +-
 net/ipv6/udp.c                      | 141 ++++++++++--
 net/ipv6/udp_impl.h                 |   4 +-
 net/ipv6/udplite.c                  |   5 +-
 net/ipv6/xfrm6_protocol.c           |  18 +-
 net/sctp/input.c                    |   5 +-
 net/sctp/ipv6.c                     |   7 +-
 tools/testing/selftests/net/pmtu.sh | 326 ++++++++++++++++++++++++++--
 40 files changed, 1025 insertions(+), 163 deletions(-)

-- 
2.19.1