[MPTCP][PATCH v2 mptcp-next 0/5] MP_FAIL support

[Geliang Tang <geliangtang@gmail.com>]

v2:
 - MP_FAIL logic:
   * Peer B send a DSS to peer A, and the data has been modify by the
  middleboxes, then peer A detects the bad checksum.
   * In the multiple subflows case, peer A sends MP_FAIL+RST back to peer B,
  and peer A discards the data following the bad data sequence number. Peer
  B receives this MP_FAIL+RST, and close this subflow.
   * In the single subflow case, using the simple implementation, peer A
  sends MP_FAIL back to peer B, and peer A fallback to a regular TCP. Peer
  B receives this MP_FAIL, and fallback to a regular TCP.
 - apply: export/20210624T054331

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/52

Geliang Tang (5):
  mptcp: MP_FAIL suboption sending
  mptcp: MP_FAIL suboption receiving
  mptcp: send out MP_FAIL when data checksum fail
  mptcp: add the mibs for MP_FAIL
  selftests: mptcp: add MP_FAIL mibs check

 include/net/mptcp.h                           |  1 +
 net/mptcp/mib.c                               |  2 +
 net/mptcp/mib.h                               |  2 +
 net/mptcp/options.c                           | 63 ++++++++++++++++++-
 net/mptcp/pm.c                                | 14 +++++
 net/mptcp/protocol.h                          | 19 ++++++
 net/mptcp/subflow.c                           | 16 +++++
 .../testing/selftests/net/mptcp/mptcp_join.sh | 38 +++++++++++
 8 files changed, 154 insertions(+), 1 deletion(-)

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2.31.1