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mptcp: use fastclose on more edge scenarios
Daire reported a user-space application hang-up when the peer is forcibly closed before the data transfer completion. The relevant application expects the peer to either do an application-level clean shutdown or a transport-level connection reset. We can accommodate a such user by extending the fastclose usage: at fd close time, if the msk socket has some unread data, and at FIN_WAIT timeout. Note that at MPTCP close time we must ensure that the TCP subflows will reset: set the linger socket option to a suitable value. 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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Paolo Abeni
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David S. Miller
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Oct 3, 2022
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