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net: Fix IPv6 PMTU disc. w/ asymmetric routes

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Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Maciej Żenczykowski 2010-10-03 14:49:00 -07:00 • committed by David S. Miller
parent 173e79fb70
commit ae878ae280
1 changed files with 24 additions and 4 deletions
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28
net/ipv6/route.c
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@ -1556,14 +1556,13 @@ out:
* i.e. Path MTU discovery * i.e. Path MTU discovery
*/ */
void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, static void rt6_do_pmtu_disc(struct in6_addr *daddr, struct in6_addr *saddr,
struct net_device *dev, u32 pmtu) struct net *net, u32 pmtu, int ifindex)
{ {
struct rt6_info *rt, *nrt; struct rt6_info *rt, *nrt;
struct net *net = dev_net(dev);
int allfrag = 0; int allfrag = 0;
rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); rt = rt6_lookup(net, daddr, saddr, ifindex, 0);
if (rt == NULL) if (rt == NULL)
return; return;
@ -1631,6 +1630,27 @@ out:
dst_release(&rt->dst); 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 * Misc support functions
*/ */