diff options
| author | Steffen Klassert <steffen.klassert@secunet.com> | 2012-10-07 22:48:18 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-28 10:56:16 -0700 |
| commit | 2db8263a627414aa2f6a60f80ec99178f12f757b (patch) | |
| tree | eb06ebf818c18a144b229e14bc8f72d78cb5d8c8 /net/ipv4/route.c | |
| parent | b434571cec084eb0798fd160073d4b66937892ab (diff) | |
ipv4: Don't create nh exeption when the device mtu is smaller than the reported pmtu
[ Upstream commit 7f92d334ba19a0d8e96f8f8f092219553367d921 ]
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4/route.c')
| -rw-r--r-- | net/ipv4/route.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 09e85c74e872..11814ad59fa6 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; |