tcp: disable Fast Open on timeouts after handshake
Some middle-boxes black-hole the data after the Fast Open handshake (https://www.ietf.org/proceedings/94/slides/slides-94-tcpm-13.pdf). The exact reason is unknown. The work-around is to disable Fast Open temporarily after multiple recurring timeouts with few or no data delivered in the established state. Signed-off-by: NYuchung Cheng <ycheng@google.com> Signed-off-by: NEric Dumazet <edumazet@google.com> Reported-by: NChristoph Paasch <cpaasch@apple.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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