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H A Dprotocol.c76e2a55d Tue Jan 12 17:25:24 GMT 2021 Paolo Abeni <pabeni@redhat.com> mptcp: better msk-level shutdown.

Instead of re-implementing most of inet_shutdown, re-use
such helper, and implement the MPTCP-specific bits at the
'proto' level.

The msk-level disconnect() can now be invoked, lets provide a
suitable implementation.

As a side effect, this fixes bad state management for listener
sockets. The latter could lead to division by 0 oops since
commit ea4ca586b16f ("mptcp: refine MPTCP-level ack scheduling").

Fixes: 43b54c6ee382 ("mptcp: Use full MPTCP-level disconnect state machine")
Fixes: ea4ca586b16f ("mptcp: refine MPTCP-level ack scheduling")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>