Commit ae878ae2 authored by Maciej Żenczykowski's avatar Maciej Żenczykowski Committed by David S. Miller
Browse files

net: Fix IPv6 PMTU disc. w/ asymmetric routes



Signed-off-by: default avatarMaciej Żenczykowski <maze@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 173e79fb
......@@ -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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