This is a note to let you know that I've just added the patch titled
net: Fix IPv6 PMTU disc. w/ asymmetric routes
to the 2.6.27-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:
net-fix-ipv6-pmtu-disc.-w-asymmetric-routes.patch
and it can be found in the queue-2.6.27 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
From 6c852c2dd993a7c13bf706af42ae697fcf094fae Mon Sep 17 00:00:00 2001
From: Maciej Żenczykowski <[email protected]>
Date: Sun, 3 Oct 2010 14:49:00 -0700
Subject: net: Fix IPv6 PMTU disc. w/ asymmetric routes
From: Maciej Żenczykowski <[email protected]>
[ Upstream commit ae878ae280bea286ff2b1e1cb6e609dd8cb4501d ]
Signed-off-by: Maciej Żenczykowski <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/ipv6/route.c | 28 ++++++++++++++++++++++++----
1 file changed, 24 insertions(+), 4 deletions(-)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1507,14 +1507,13 @@ out:
* i.e. Path MTU discovery
*/
-void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
- struct net_device *dev, u32 pmtu)
+static void rt6_do_pmtu_disc(struct in6_addr *daddr, struct in6_addr *saddr,
+ struct net *net, u32 pmtu, int ifindex)
{
struct rt6_info *rt, *nrt;
- struct net *net = dev_net(dev);
int allfrag = 0;
- rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0);
+ rt = rt6_lookup(net, daddr, saddr, ifindex, 0);
if (rt == NULL)
return;
@@ -1582,6 +1581,27 @@ out:
dst_release(&rt->u.dst);
}
+void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
+ struct net_device *dev, u32 pmtu)
+{
+ struct net *net = dev_net(dev);
+
+ /*
+ * RFC 1981 states that a node "MUST reduce the size of the packets it
+ * is sending along the path" that caused the Packet Too Big message.
+ * Since it's not possible in the general case to determine which
+ * interface was used to send the original packet, we update the MTU
+ * on the interface that will be used to send future packets. We also
+ * update the MTU on the interface that received the Packet Too Big in
+ * case the original packet was forced out that interface with
+ * SO_BINDTODEVICE or similar. This is the next best thing to the
+ * correct behaviour, which would be to update the MTU on all
+ * interfaces.
+ */
+ rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0);
+ rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex);
+}
+
/*
* Misc support functions
*/
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.27/net-fix-ipv6-pmtu-disc.-w-asymmetric-routes.patch
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