This is a note to let you know that I've just added the patch titled
ipv4: Don't create nh exeption when the device mtu is smaller than the
reported pmtu
to the 3.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipv4-don-t-create-nh-exeption-when-the-device-mtu-is-smaller-than-the-reported-pmtu.patch
and it can be found in the queue-3.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 770f58d7866dfb0bc61a797ae601b7e481d741d5 Mon Sep 17 00:00:00 2001
From: Steffen Klassert <[email protected]>
Date: Sun, 7 Oct 2012 22:48:18 +0000
Subject: ipv4: Don't create nh exeption when the device mtu is smaller than the
reported pmtu
From: Steffen Klassert <[email protected]>
[ 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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/ipv4/route.c | 3 +++
1 file changed, 3 insertions(+)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -909,6 +909,9 @@ static void __ip_rt_update_pmtu(struct r
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;
Patches currently in stable-queue which might be from
[email protected] are
queue-3.6/ipv4-always-invalidate-or-update-the-route-on-pmtu-events.patch
queue-3.6/ipv4-don-t-report-stale-pmtu-values-to-userspace.patch
queue-3.6/ipv4-don-t-create-nh-exeption-when-the-device-mtu-is-smaller-than-the-reported-pmtu.patch
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