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If the user has closed the socket then drop a persisting connection

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after a much reduced timeout.

Typically web servers close their sockets quickly under the assumption
that the TCP connections goes away as well.  That is not entirely true
however.  If the peer closed the window we're going to wait for a long
time with lots of data in the send buffer.

MFC after:	2 weeks
This commit is contained in:
Andre Oppermann 2012-10-28 19:58:20 +00:00
parent 09440655fe
commit 322181c98e
1 changed files with 10 additions and 0 deletions
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10
sys/netinet/tcp_timer.c
View file

@ -447,6 +447,16 @@ tcp_timer_persist(void *xtp)
tp = tcp_drop(tp, ETIMEDOUT);
goto out;
}
/*
* If the user has closed the socket then drop a persisting
* connection after a much reduced timeout.
*/
if (tp->t_state > TCPS_CLOSE_WAIT &&
(ticks - tp->t_rcvtime) >= TCPTV_PERSMAX) {
TCPSTAT_INC(tcps_persistdrop);
tp = tcp_drop(tp, ETIMEDOUT);
goto out;
}
tcp_setpersist(tp);
tp->t_flags |= TF_FORCEDATA;
(void) tcp_output(tp);