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ipv4: Don't increase PMTU with Datagram Too Big message.

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RFC 1191 said, "a host MUST not increase its estimate of the Path
MTU in response to the contents of a Datagram Too Big message."

Signed-off-by: Li Wei <lw@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Li Wei 2015-01-29 16:09:03 +08:00 committed by David S. Miller
parent a1a0b558ce
commit 3cdaa5be9e
1 changed files with 3 additions and 0 deletions
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net/ipv4/route.c
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@ -966,6 +966,9 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
if (dst->dev->mtu < mtu)
return;
if (rt->rt_pmtu && rt->rt_pmtu < mtu)
return;
if (mtu < ip_rt_min_pmtu)
mtu = ip_rt_min_pmtu;