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authorSteffen Klassert <steffen.klassert@secunet.com>2012-10-07 22:48:18 +0000
committerDavid S. Miller <davem@davemloft.net>2012-10-08 14:46:35 -0400
commit7f92d334ba19a0d8e96f8f8f092219553367d921 (patch)
tree61974ee8b7c5b0428401e29836ce2cc1bbc9484e /net
parentd851c12b60471188e15e5c8405b289073e8dd025 (diff)
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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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/route.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 90ba8358a89..741df67a81e 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -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;