[Bug 217637] One TCP connection accepted TWO times

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Fri Mar 17 15:53:44 UTC 2017


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217637

--- Comment #27 from Michael Tuexen <tuexen at freebsd.org> ---
(In reply to slw from comment #24)
Consider a client doing a connect() call followed by a send() call. The connect
call triggers the three way handshake. Assume that the third message is lost.
So the send call triggers the sending of a TCP segment with the same sequence
number as the third message of the handshake and it contains data. From the
server perspective this TCP segment passes the syncookie checks.

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