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From: Peter Wemm <peter@FreeBSD.org>
Date: Tue, 7 Jan 2014 23:01:34 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r260419 - stable/9/sys/netinet
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Author: peter
Date: Tue Jan  7 23:01:33 2014
New Revision: 260419
URL: http://svnweb.freebsd.org/changeset/base/260419

Log:
  MFC r258821 - fix tcp simultaneous close
  
  PR:             kern/99188

Modified:
  stable/9/sys/netinet/tcp_input.c

Modified: stable/9/sys/netinet/tcp_input.c
==============================================================================
--- stable/9/sys/netinet/tcp_input.c	Tue Jan  7 23:01:05 2014	(r260418)
+++ stable/9/sys/netinet/tcp_input.c	Tue Jan  7 23:01:33 2014	(r260419)
@@ -2407,13 +2407,15 @@ tcp_do_segment(struct mbuf *m, struct tc
 		hhook_run_tcp_est_in(tp, th, &to);
 
 		if (SEQ_LEQ(th->th_ack, tp->snd_una)) {
-			if (tlen == 0 && tiwin == tp->snd_wnd) {
+			if (tlen == 0 && tiwin == tp->snd_wnd &&
+			    !(thflags & TH_FIN)) {
 				TCPSTAT_INC(tcps_rcvdupack);
 				/*
 				 * If we have outstanding data (other than
 				 * a window probe), this is a completely
 				 * duplicate ack (ie, window info didn't
-				 * change), the ack is the biggest we've
+				 * change and FIN isn't set),
+				 * the ack is the biggest we've
 				 * seen and we've seen exactly our rexmt
 				 * threshhold of them, assume a packet
 				 * has been dropped and retransmit it.