From: Steffen Klassert <steffen.klassert@secunet.com>
Date: Wed, 16 Jan 2013 20:58:10 +0000 (+0000)
Subject: ipv4: Don't update the pmtu on mtu locked routes
X-Git-Tag: firefly_0821_release~3680^2~1198^2~46
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=fa1e492aa3cbafba9f8fc6d05e5b08a3091daf4a;p=firefly-linux-kernel-4.4.55.git

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@ssi.bg>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 6e4a89c5e27e..259cbeee9a8b 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;