mptcp: propagate fastclose error
When an mptcp socket is closed due to an incoming FASTCLOSE option, so specific sk_err is set and later syscall will fail usually with EPIPE. Align the current fastclose error handling with TCP reset, properly setting the socket error according to the current msk state and propagating such error. Additionally sendmsg() is currently not handling properly the sk_err, always returning EPIPE. Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net> Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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