From a3e788a027651797a849e2d1f3ce39acb08ada95 Mon Sep 17 00:00:00 2001
From: provos <provos@openbsd.org>
Date: Sat, 23 Jun 2001 03:10:21 +0000
Subject: fix up mtu for routes and ongoing tcp connection when if mtu changes
 from FreeBSD; fixes pr/1878

---
 sys/netinet/tcp_output.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

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

diff --git a/sys/netinet/tcp_output.c b/sys/netinet/tcp_output.c
index a694cc0886d..37c2419b1ca 100644
--- a/sys/netinet/tcp_output.c
+++ b/sys/netinet/tcp_output.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tcp_output.c,v 1.37 2001/06/08 03:53:46 angelos Exp $	*/
+/*	$OpenBSD: tcp_output.c,v 1.38 2001/06/23 03:10:21 provos Exp $	*/
 /*	$NetBSD: tcp_output.c,v 1.16 1997/06/03 16:17:09 kml Exp $	*/
 
 /*
@@ -1102,6 +1102,16 @@ out:
 			tcp_quench(tp->t_inpcb, 0);
 			return (0);
 		}
+		if (error == EMSGSIZE) {
+			/*
+			 * ip_output() will have already fixed the route
+			 * for us.  tcp_mtudisc() will, as its last action,
+			 * initiate retransmission, so it is important to
+			 * not do so here.
+			 */
+			tcp_mtudisc(tp->t_inpcb, 0);
+			return (0);
+		}
 		if ((error == EHOSTUNREACH || error == ENETDOWN)
 		    && TCPS_HAVERCVDSYN(tp->t_state)) {
 			tp->t_softerror = error;
-- 
cgit v1.2.3-59-g8ed1b