Commit cb6ccf09 authored Apr 28, 2015 by Herbert Xu Committed by David S. Miller Apr 29, 2015

route: Use ipv4_mtu instead of raw rt_pmtu



The commit 3cdaa5be ("ipv4: Don't
increase PMTU with Datagram Too Big message") broke PMTU in cases
where the rt_pmtu value has expired but is smaller than the new
PMTU value.

This obsolete rt_pmtu then prevents the new PMTU value from being
installed.

Fixes: 3cdaa5be ("ipv4: Don't increase PMTU with Datagram Too Big message")
Reported-by: Gerd v. Egidy <gerd.von.egidy@intra2net.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 39376ccb

net/ipv4/route.c

+1 −4

Original line number	Diff line number	Diff line
		@@ -962,10 +962,7 @@ static void __ip_rt_update_pmtu(struct rtable rt, struct flowi4 fl4, u32 mtu)
		if (dst_metric_locked(dst, RTAX_MTU))
		return;

		if (dst->dev->mtu < mtu)
		return;

		if (rt->rt_pmtu && rt->rt_pmtu < mtu)
		if (ipv4_mtu(dst) < mtu)
		return;

		if (mtu < ip_rt_min_pmtu)