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route: Use ipv4_mtu instead of raw rt_pmtu 

The commit 3cdaa5be9e ("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: 3cdaa5be9e ("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>
hifive-unleashed-5.1
Herbert Xu 2015-04-28 11:43:15 +08:00 committed by David S. Miller
parent 39376ccb19
commit cb6ccf09d6
1 changed files with 1 additions and 4 deletions
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5
net/ipv4/route.c
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@ -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)