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Matthieu Baerts says: ==================== mptcp: fix stalled connections Daire reported a few issues with MPTCP where some connections were stalled in different states. Paolo did a great job fixing them. Patch 1 fixes bogus receive window shrinkage with multiple subflows. Due to a race condition and unlucky circumstances, that may lead to TCP-level window shrinkage, and the connection being stalled on the sender end. Patch 2 is a preparation for patch 3 which processes pending subflow errors on close. Without that and under specific circumstances, the MPTCP-level socket might not switch to the CLOSE state and stall. Patch 4 is also a preparation patch for the next one. Patch 5 fixes MPTCP connections not switching to the CLOSE state when all subflows have been closed but no DATA_FIN have been exchanged to explicitly close the MPTCP connection. Now connections in such state will switch to the CLOSE state after a timeout, still allowing the "make-after-break" feature but making sure connections don't stall forever. It will be possible to modify this timeout -- currently matching TCP TIMEWAIT value (60 seconds) -- in a future version. ==================== Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Linux kernel
============
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