[src/trunk]: src/sys/netinet Ensure that out of window SYNs receive an ACK in...

[kml <kml%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9c8690676c1f
branches:  trunk
changeset: 471742:9c8690676c1f
user:      kml <kml%NetBSD.org@localhost>
date:      Fri Apr 09 22:01:07 1999 +0000

description:
Ensure that out of window SYNs receive an ACK in responce, rather than
being dropped.  This fixes a bug reported by Jason Thorpe.

diffstat:

 sys/netinet/tcp_input.c |  10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diffs (24 lines):

diff -r 7700bf9f8690 -r 9c8690676c1f sys/netinet/tcp_input.c
--- a/sys/netinet/tcp_input.c   Fri Apr 09 21:29:21 1999 +0000
+++ b/sys/netinet/tcp_input.c   Fri Apr 09 22:01:07 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tcp_input.c,v 1.77 1999/02/05 22:37:24 matt Exp $      */
+/*     $NetBSD: tcp_input.c,v 1.78 1999/04/09 22:01:07 kml Exp $       */
 
 /*-
  * Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.
@@ -1104,8 +1104,12 @@
        /*
         * If the ACK bit is off we drop the segment and return.
         */
-       if ((tiflags & TH_ACK) == 0)
-               goto drop;
+       if ((tiflags & TH_ACK) == 0) {
+               if (tp->t_flags & TF_ACKNOW)
+                       goto dropafterack;
+               else
+                       goto drop;
+       }
        
        /*
         * Ack processing.