From ef980ed66cafe544c740bf3411db2a71c0663b81 Mon Sep 17 00:00:00 2001
From: mpi <mpi@openbsd.org>
Date: Tue, 27 Jan 2015 10:20:31 +0000
Subject: [PATCH] Do not overwrite user-specified MTU.

Allow to use different size than the default of 32K.

ok henning@, stsp@, florian@, benno@ as part of a larger diff.
---
 sys/net/if_loop.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/net/if_loop.c b/sys/net/if_loop.c
index b1477bea6e7..de83df52460 100644
--- a/sys/net/if_loop.c
+++ b/sys/net/if_loop.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_loop.c,v 1.62 2014/12/19 17:14:39 tedu Exp $	*/
+/*	$OpenBSD: if_loop.c,v 1.63 2015/01/27 10:20:31 mpi Exp $	*/
 /*	$NetBSD: if_loop.c,v 1.15 1996/05/07 02:40:33 thorpej Exp $	*/
 
 /*
@@ -271,7 +271,7 @@ looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
 void
 lortrequest(int cmd, struct rtentry *rt)
 {
-	if (rt)
+	if (rt && rt->rt_rmx.rmx_mtu == 0)
 		rt->rt_rmx.rmx_mtu = LOMTU;
 }
 
-- 
2.20.1