From d59e8e14cd2b84d6d268a21f40d6ec0b32baf5f7 Mon Sep 17 00:00:00 2001
From: yasuoka <yasuoka@openbsd.org>
Date: Sat, 8 Sep 2018 01:03:59 +0000
Subject: [PATCH] Don't cause an error when setting the same rdomain. Found by
 asou at soum.co.jp.

ok claudio mpi akoshibe benno
---
 sys/net/if.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sys/net/if.c b/sys/net/if.c
index 7097eb278ef..a78b53db9bc 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if.c,v 1.559 2018/08/09 03:35:19 akoshibe Exp $	*/
+/*	$OpenBSD: if.c,v 1.560 2018/09/08 01:03:59 yasuoka Exp $	*/
 /*	$NetBSD: if.c,v 1.35 1996/05/07 05:26:04 thorpej Exp $	*/
 
 /*
@@ -1743,7 +1743,8 @@ if_setrdomain(struct ifnet *ifp, int rdomain)
 	if (rdomain < 0 || rdomain > RT_TABLEID_MAX)
 		return (EINVAL);
 
-	if ((ifp->if_flags & IFF_LOOPBACK) &&
+	if (rdomain != ifp->if_rdomain &&
+	    (ifp->if_flags & IFF_LOOPBACK) &&
 	    (ifp->if_index == rtable_loindex(ifp->if_rdomain)))
 		return (EPERM);
 
-- 
2.20.1