[ 44/61] ipv4: Dont update the pmtu on mtu locked routes

From: Greg Kroah-Hartman
Date: Tue Feb 12 2013 - 15:36:13 EST

3.7-stable review patch. If anyone has any objections, please let me know.


From: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>

[ Upstream commit fa1e492aa3cbafba9f8fc6d05e5b08a3091daf4a ]

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

Reported-by: Julian Anastasov <ja@xxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/ipv4/route.c | 3 +++
1 file changed, 3 insertions(+)

--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -912,6 +912,9 @@ static void __ip_rt_update_pmtu(struct r
struct dst_entry *dst = &rt->dst;
struct fib_result res;

+ if (dst_metric_locked(dst, RTAX_MTU))
+ return;
if (dst->dev->mtu < mtu)

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