netdev - [PATCH] IPv6: fix Mobile IPv6 regression

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Date:	Fri, 28 May 2010 14:17:43 -0400
From:	Brian Haley <brian.haley@...com>
To:	David Miller <davem@...emloft.net>
CC:	Arnaud Ebalard <arno@...isbad.org>,
	Scott C Otto <otts@...atel-lucent.com>,
	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>, Jiri Olsa <jolsa@...hat.com>,
	netdev@...r.kernel.org
Subject: [PATCH] IPv6: fix Mobile IPv6 regression

Commit f4f914b5 (net: ipv6 bind to device issue) caused
a regression with Mobile IPv6 when it changed the meaning
of fl->oif to become a strict requirement of the route
lookup.  Instead, only force strict mode when
sk->sk_bound_dev_if is set on the calling socket, getting
the intended behavior and fixing the regression.

Tested-by: Arnaud Ebalard <arno@...isbad.org>
Signed-off-by: Brian Haley <brian.haley@...com>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 294cbe8..252d761 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -814,7 +814,7 @@ struct dst_entry * ip6_route_output(struct net *net, struct sock *sk,
 {
 	int flags = 0;
 
-	if (fl->oif || rt6_need_strict(&fl->fl6_dst))
+	if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl->fl6_dst))
 		flags |= RT6_LOOKUP_F_IFACE;
 
 	if (!ipv6_addr_any(&fl->fl6_src))
--
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