From 5c00ec94510f80a57114389fc674a445b12b04d1 Mon Sep 17 00:00:00 2001
From: provos <provos@openbsd.org>
Date: Mon, 24 May 1999 17:46:40 +0000
Subject: instead of dropping out of window SYNs, send an ACK and drop
 afterwards. fixes a problem with NFS over TCP reported by Jason Thorpe, fix
 from klm@netbsd.org

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

(limited to 'sys/netinet/tcp_input.c')

diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
index e9d4d1277de..15b0a09daa4 100644
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tcp_input.c,v 1.34 1999/04/21 21:38:58 provos Exp $	*/
+/*	$OpenBSD: tcp_input.c,v 1.35 1999/05/24 17:46:40 provos Exp $	*/
 /*	$NetBSD: tcp_input.c,v 1.23 1996/02/13 23:43:44 christos Exp $	*/
 
 /*
@@ -1481,8 +1481,12 @@ trimthenstep6:
 	/*
 	 * 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.
-- 
cgit v1.2.3-59-g8ed1b