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tcp: Discard segments that ack data not yet sent
Discard incoming packets whose ack field iincludes data not yet sent. This is consistent with RFC 793 Section 3.9. Change tcp_ack() to distinguish between too-small and too-large ack field values. Keep segments with too-large ack fields out of the fast path, and change slow path to discard them. Reported-by: Oliver Zheng <email@example.com> Signed-off-by: John Dykstra <firstname.lastname@example.org> Signed-off-by: David S. Miller <email@example.com>
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