ipv4: Don't create nh exeption when the device mtu is smaller than the reported pmtu
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>
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@ -909,6 +909,9 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
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struct dst_entry *dst = &rt->dst;
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struct fib_result res;
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if (dst->dev->mtu < mtu)
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return;
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if (mtu < ip_rt_min_pmtu)
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mtu = ip_rt_min_pmtu;
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