Commit 7f92d334 authored Oct 07, 2012 by Steffen Klassert Committed by David S. Miller Oct 08, 2012

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>

parent d851c12b

net/ipv4/route.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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;