svn commit: r242263 - head/sys/netinet

[Andre Oppermann]

Author: andre
Date: Sun Oct 28 19:20:23 2012
New Revision: 242263
URL: http://svn.freebsd.org/changeset/base/242263

Log:
  Add SACK_PERMIT to the list of TCP options that are switched off after
  retransmitting a SYN three times.
  
  MFC after:	2 weeks

Modified:
  head/sys/netinet/tcp_timer.c

Modified: head/sys/netinet/tcp_timer.c
==============================================================================
--- head/sys/netinet/tcp_timer.c	Sun Oct 28 19:16:22 2012	(r242262)
+++ head/sys/netinet/tcp_timer.c	Sun Oct 28 19:20:23 2012	(r242263)
@@ -585,7 +585,7 @@ tcp_timer_rexmt(void * xtp)
 	 * 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);
+		tp->t_flags &= ~(TF_REQ_SCALE|TF_REQ_TSTMP|TF_SACK_PERMIT);
 	/*
 	 * If we backed off this far, our srtt estimate is probably bogus.
 	 * Clobber it so we'll take the next rtt measurement as our srtt;