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Disable rfc1323 and rfc1644 TCP extensions if we havn't got

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any response to our third SYN to work-around some broken
terminal servers (most of which have hopefully been retired)
that have bad VJ header compression code which trashes TCP
segments containing unknown-to-them TCP options.

PR:		kern/1689
Submitted by:	jesper
Reviewed by:	wollman
MFC after:	2 weeks
This commit is contained in:
Jesper Skriver 2001-05-31 19:24:49 +00:00
parent 80cbb3c13a
commit 7ceb778366
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=77539
1 changed files with 9 additions and 0 deletions
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9
sys/netinet/tcp_timer.c
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@ -387,6 +387,15 @@ tcp_timer_rexmt(xtp)
rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
TCPT_RANGESET(tp->t_rxtcur, rexmt,
tp->t_rttmin, TCPTV_REXMTMAX);
/*
* Disable rfc1323 and rfc1644 if we havn't got any response to
* our third SYN to work-around some broken terminal servers
* (most of which have hopefully been retired) that have bad VJ
* header compression code which trashes TCP segments containing
* unknown-to-them TCP options.
*/
if ((tp->t_state == TCPS_SYN_SENT) && (tp->t_rxtshift == 3))
tp->t_flags &= ~(TF_REQ_SCALE|TF_REQ_TSTMP|TF_REQ_CC);
/*
* If losing, let the lower level know and try for
* a better route. Also, if we backed off this far,