Don't cause an error when setting the same rdomain.

Found by asou at soum.co.jp.

ok claudio mpi akoshibe benno

diff --git a/sys/net/if.c b/sys/net/if.c
index 7097eb2..a78b53d 100644 (file)
--- 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);