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ipv4: Don't create nh exeption when the device mtu is smaller than the reported pmtu

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When a local tool like tracepath tries to send packets bigger than
the device mtu, we create a nh exeption and set the pmtu to device
mtu. The device mtu does not expire, so check if the device mtu is
smaller than the reported pmtu and don't crerate a nh exeption in
that case.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steffen Klassert 2012-10-07 22:48:18 +00:00 committed by David S. Miller
parent d851c12b60
commit 7f92d334ba
1 changed files with 3 additions and 0 deletions
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3
net/ipv4/route.c
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@ -909,6 +909,9 @@ 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->dev->mtu < mtu)
return;
if (mtu < ip_rt_min_pmtu)
mtu = ip_rt_min_pmtu;