From fe8ae46b757275ea85c6c91e21a85cc276e18e55 Mon Sep 17 00:00:00 2001
From: ozaki-r <ozaki-r>
Date: Mon, 25 May 2015 07:17:17 +0000
Subject: [PATCH] Fix specifying an interface for IPV6_JOIN_GROUP

Using always an interface of index=1 is not good idea; it varies
depending on runtime environments. We can use index=0 instead,
which allows the kernel to pick an appropriate interface for mcast.
---
 tests/net/mcast/t_mcast.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tests/net/mcast/t_mcast.c b/tests/net/mcast/t_mcast.c
index 333d77297172f..995d90c68ff77 100644
--- a/tests/net/mcast/t_mcast.c
+++ b/tests/net/mcast/t_mcast.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: t_mcast.c,v 1.15 2015/05/19 04:14:04 ozaki-r Exp $	*/
+/*	$NetBSD: t_mcast.c,v 1.16 2015/05/25 07:17:17 ozaki-r Exp $	*/
 
 /*-
  * Copyright (c) 2014 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 #include <sys/cdefs.h>
 #ifdef __RCSID
-__RCSID("$NetBSD: t_mcast.c,v 1.15 2015/05/19 04:14:04 ozaki-r Exp $");
+__RCSID("$NetBSD: t_mcast.c,v 1.16 2015/05/25 07:17:17 ozaki-r Exp $");
 #else
 extern const char *__progname;
 #define getprogname() __progname
@@ -132,12 +132,12 @@ addmc(int s, struct addrinfo *ai, bool bug)
 		if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
 		    &ifc, sizeof(ifc)) == -1)
 			return -1;
-		ifc = 1;
+		ifc = 1; /* XXX should pick a proper interface */
 		if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_IF, &ifc,
 		    sizeof(ifc)) == -1)
 			return -1;
 #else
-		ifc = 1;
+		ifc = 0; /* Let pick an appropriate interface */
 #endif
 		m6.ipv6mr_interface = ifc;
 		m6.ipv6mr_multiaddr = s6->sin6_addr;