This is a note to let you know that I've just added the patch titled
ipv4: Always invalidate or update the route on pmtu events
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-always-invalidate-or-update-the-route-on-pmtu-events.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 42ca21062a7faeec9140494e39d1d3f931f459e9 Mon Sep 17 00:00:00 2001
From: Steffen Klassert <[email protected]>
Date: Sun, 7 Oct 2012 22:47:25 +0000
Subject: ipv4: Always invalidate or update the route on pmtu events
From: Steffen Klassert <[email protected]>
[ Upstream commit d851c12b60471188e15e5c8405b289073e8dd025 ]
Some protocols, like IPsec still cache routes. So we need to invalidate
the old route on pmtu events to avoid the reuse of stale routes.
We also need to update the mtu and expire time of the route if we already
use a nh exception route, otherwise we ignore newly learned pmtu values
after the first expiration.
With this patch we always invalidate or update the route on pmtu events.
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 | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -904,22 +904,29 @@ out: kfree_skb(skb);
return 0;
}
-static u32 __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
+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 (mtu < ip_rt_min_pmtu)
mtu = ip_rt_min_pmtu;
+ if (!rt->rt_pmtu) {
+ dst->obsolete = DST_OBSOLETE_KILL;
+ } else {
+ rt->rt_pmtu = mtu;
+ dst->expires = max(1UL, jiffies + ip_rt_mtu_expires);
+ }
+
rcu_read_lock();
- if (fib_lookup(dev_net(rt->dst.dev), fl4, &res) == 0) {
+ if (fib_lookup(dev_net(dst->dev), fl4, &res) == 0) {
struct fib_nh *nh = &FIB_RES_NH(res);
update_or_create_fnhe(nh, fl4->daddr, 0, mtu,
jiffies + ip_rt_mtu_expires);
}
rcu_read_unlock();
- return mtu;
}
static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
@@ -929,14 +936,7 @@ static void ip_rt_update_pmtu(struct dst
struct flowi4 fl4;
ip_rt_build_flow_key(&fl4, sk, skb);
- mtu = __ip_rt_update_pmtu(rt, &fl4, mtu);
-
- if (!rt->rt_pmtu) {
- dst->obsolete = DST_OBSOLETE_KILL;
- } else {
- rt->rt_pmtu = mtu;
- rt->dst.expires = max(1UL, jiffies + ip_rt_mtu_expires);
- }
+ __ip_rt_update_pmtu(rt, &fl4, mtu);
}
void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu,
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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