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authorMaciej ┼╗enczykowski <maze@google.com>2010-10-03 14:49:00 -0700
committerDavid S. Miller <davem@davemloft.net>2010-10-03 14:49:00 -0700
commitae878ae280bea286ff2b1e1cb6e609dd8cb4501d (patch)
tree06aee50c978db50558ef9b0d80790d75156b1feb /net
parent173e79fb70a98b5b223f8dc09c22990d777bdd78 (diff)
net: Fix IPv6 PMTU disc. w/ asymmetric routes
Signed-off-by: Maciej ┼╗enczykowski <maze@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/route.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 8323136bdc54..a275c6e1e25c 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1556,14 +1556,13 @@ 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;
@@ -1631,6 +1630,27 @@ out:
dst_release(&rt->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
*/

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