netdev - [PATCH 2/2] ipv4: Don't update the pmtu on mtu locked routes

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Message-ID: <20130117065810.GH18940@secunet.com>
Date:	Thu, 17 Jan 2013 07:58:10 +0100
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	David Miller <davem@...emloft.net>
Cc:	Julian Anastasov <ja@....bg>, timo.teras@....fi,
	luky-37@...mail.com, pupilla@...ero.it, netdev@...r.kernel.org
Subject: [PATCH 2/2] ipv4: Don't update the pmtu on mtu locked routes

Routes with locked mtu should not use learned pmtu informations,
so do not update the pmtu on these routes.

Reported-by: Julian Anastasov <ja@....bg>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/ipv4/route.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 6e4a89c..259cbee 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -912,6 +912,9 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
 	struct dst_entry *dst = &rt->dst;
 	struct fib_result res;
 
+	if (dst_metric_locked(dst, RTAX_MTU))
+		return;
+
 	if (dst->dev->mtu < mtu)
 		return;
 
-- 
1.7.9.5

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