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authorDavid S. Miller <davem@davemloft.net>2010-10-04 11:56:38 -0700
committerDavid S. Miller <davem@davemloft.net>2010-10-04 11:56:38 -0700
commit21a180cda012e1f93e362dd4a9b0bfd3d8c92940 (patch)
tree0e0d10baa3fdcd8ffbc6881076ff1695808dad9d /net/ipv6
parentc7d4426a98a5f6654cd0b4b33d9dab2e77192c18 (diff)
parent51e97a12bef19b7e43199fc153cf9bd5f2140362 (diff)
downloadop-kernel-dev-21a180cda012e1f93e362dd4a9b0bfd3d8c92940.zip
op-kernel-dev-21a180cda012e1f93e362dd4a9b0bfd3d8c92940.tar.gz
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Conflicts: net/ipv4/Kconfig net/ipv4/tcp_timer.c
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/route.c30
1 files changed, 25 insertions, 5 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 25476e7..17e2179 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -670,7 +670,7 @@ static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *dad
if (net_ratelimit())
printk(KERN_WARNING
- "Neighbour table overflow.\n");
+ "ipv6: Neighbour table overflow.\n");
dst_free(&rt->dst);
return NULL;
}
@@ -1559,14 +1559,13 @@ 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;
@@ -1634,6 +1633,27 @@ 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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