[MPTCP] [PATCH 0/2] mptcp: fix some mp_join error paths

[Paolo Abeni <pabeni at redhat.com>]

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Currently we do not handle correctly MP_JOIN + syncookie and MP_JOIN
failure due to passive socket being already closed.

First patch place the infrastructure needed, the 2nd one addresses the issues.
Note: in such error path, we will end-up creating the child socket just to
reset the connection. I don't see an easy way to avoid such allocation and
doing differently (reset on syn) could be dangerous (attacker can use the mptcp
server to target a victim using spoofed bogus mp_join syn)

Paolo Abeni (2):
  mptcp: cache msk on MP_JOIN init_req
  mptcp: drop MP_JOIN request sock on syn cookies

 net/mptcp/protocol.h |  1 +
 net/mptcp/subflow.c  | 56 ++++++++++++++++++++------------------------
 2 files changed, 27 insertions(+), 30 deletions(-)

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2.21.3