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.
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