From 39b94094a22f24a827039933d795fcc2bc0bbe6c Mon Sep 17 00:00:00 2001
From: provos <provos@openbsd.org>
Date: Wed, 20 Sep 2000 17:00:22 +0000
Subject: correctly calculate mss

---
 sys/netinet/tcp_output.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

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

diff --git a/sys/netinet/tcp_output.c b/sys/netinet/tcp_output.c
index 8b6ad202982..f1ab4a5ab05 100644
--- a/sys/netinet/tcp_output.c
+++ b/sys/netinet/tcp_output.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tcp_output.c,v 1.32 2000/09/18 22:06:38 provos Exp $	*/
+/*	$OpenBSD: tcp_output.c,v 1.33 2000/09/20 17:00:22 provos Exp $	*/
 /*	$NetBSD: tcp_output.c,v 1.16 1997/06/03 16:17:09 kml Exp $	*/
 
 /*
@@ -512,9 +512,13 @@ send:
 
 			opt[0] = TCPOPT_MAXSEG;
 			opt[1] = 4;
-			mss = htons((u_int16_t) tcp_mss(tp, 0));
+			mss = htons((u_int16_t) tcp_mss(tp, flags & TH_ACK ? 
+							tp->t_maxopd : 0));
 			bcopy((caddr_t)&mss, (caddr_t)(opt + 2), sizeof(mss));
 			optlen = 4;
+
+			if (flags & TH_ACK)
+				tcp_mss_update(tp);
 #ifdef TCP_SACK
 			/* 
 			 * If this is the first SYN of connection (not a SYN 
-- 
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