From: Jianzhao Wang <jianzhao.wang@6wind.com>
Date: Wed, 8 Sep 2010 21:35:43 +0000 (-0700)
Subject: net: blackhole route should always be recalculated
X-Git-Tag: v2.6.32.25~21
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2aff10f56700674bcc5fcc015e3f8aee6c689065;p=karo-tx-linux.git

net: blackhole route should always be recalculated

[ Upstream commit ae2688d59b5f861dc70a091d003773975d2ae7fb ]

Blackhole routes are used when xfrm_lookup() returns -EREMOTE (error
triggered by IKE for example), hence this kind of route is always
temporary and so we should check if a better route exists for next
packets.
Bug has been introduced by commit d11a4dc18bf41719c9f0d7ed494d295dd2973b92.

Signed-off-by: Jianzhao Wang <jianzhao.wang@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 5b1050a5d874..6c8f6c9e5cdb 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2712,6 +2712,11 @@ slow_output:
 
 EXPORT_SYMBOL_GPL(__ip_route_output_key);
 
+static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie)
+{
+	return NULL;
+}
+
 static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
 {
 }
@@ -2720,7 +2725,7 @@ static struct dst_ops ipv4_dst_blackhole_ops = {
 	.family			=	AF_INET,
 	.protocol		=	cpu_to_be16(ETH_P_IP),
 	.destroy		=	ipv4_dst_destroy,
-	.check			=	ipv4_dst_check,
+	.check			=	ipv4_blackhole_dst_check,
 	.update_pmtu		=	ipv4_rt_blackhole_update_pmtu,
 	.entries		=	ATOMIC_INIT(0),
 };