[PATCH net-next 0/7] sctp: support vrf processing

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This patchset adds the VRF processing in SCTP. Simliar to TCP/UDP,
it includes socket bind and socket/association lookup changes.

For socket bind change, it allows sockets to bind to a VRF device
and allows multiple sockets with the same IP and PORT to bind to
different interfaces in patch 1-3.

For socket/association lookup change, it adds dif and sdif check
in both asoc and ep lookup in patch 4 and 5, and when binding to
nodev, users can decide if accept the packets received from one
l3mdev by setup a sysctl option in patch 6.

Note with VRF support, in a netns, an association will be decided
by src ip + src port + dst ip + dst port + bound_dev_if, and it's
possible for ss to have:

# ss --sctp -n
  State       Local Address:Port      Peer Address:Port
   `- ESTAB
   `- ESTAB

See the selftest in patch 7 for more usage.

Also, thanks Carlo for testing this patch series on their use.

Xin Long (7):
  sctp: verify the bind address with the tb_id from l3mdev
  sctp: check ipv6 addr with sk_bound_dev if set
  sctp: check sk_bound_dev_if when matching ep in get_port
  sctp: add skb_sdif in struct sctp_af
  sctp: add dif and sdif check in asoc and ep lookup
  sctp: add sysctl net.sctp.l3mdev_accept
  selftests: add a selftest for sctp vrf

 Documentation/networking/ip-sysctl.rst   |   9 ++
 include/net/netns/sctp.h                 |   4 +
 include/net/sctp/sctp.h                  |  16 ++-
 include/net/sctp/structs.h               |   9 +-
 net/sctp/diag.c                          |   3 +-
 net/sctp/endpointola.c                   |  13 +-
 net/sctp/input.c                         |  98 +++++++-------
 net/sctp/ipv6.c                          |  22 +++-
 net/sctp/protocol.c                      |  19 ++-
 net/sctp/socket.c                        |   9 +-
 net/sctp/sysctl.c                        |  11 ++
 tools/testing/selftests/net/Makefile     |   2 +
 tools/testing/selftests/net/sctp_hello.c | 139 ++++++++++++++++++++
 tools/testing/selftests/net/sctp_vrf.sh  | 160 +++++++++++++++++++++++
 14 files changed, 445 insertions(+), 69 deletions(-)
 create mode 100644 tools/testing/selftests/net/sctp_hello.c
 create mode 100755 tools/testing/selftests/net/sctp_vrf.sh


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