[IPV6]: Don't update ADVMSS on routes where the MTU is not also updated

[pandora-kernel.git] / net / ipv6 / route.c

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index b46ad53..55ea80f 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -119,6 +119,19 @@ static struct dst_ops ip6_dst_ops = {
        .entry_size             =       sizeof(struct rt6_info),
 };
 
+static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
+{
+}
+
+static struct dst_ops ip6_dst_blackhole_ops = {
+       .family                 =       AF_INET6,
+       .protocol               =       __constant_htons(ETH_P_IPV6),
+       .destroy                =       ip6_dst_destroy,
+       .check                  =       ip6_dst_check,
+       .update_pmtu            =       ip6_rt_blackhole_update_pmtu,
+       .entry_size             =       sizeof(struct rt6_info),
+};
+
 struct rt6_info ip6_null_entry = {
        .u = {
                .dst = {
@@ -833,6 +846,54 @@ struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
 
 EXPORT_SYMBOL(ip6_route_output);
 
+static int ip6_blackhole_output(struct sk_buff *skb)
+{
+       kfree_skb(skb);
+       return 0;
+}
+
+int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl)
+{
+       struct rt6_info *ort = (struct rt6_info *) *dstp;
+       struct rt6_info *rt = (struct rt6_info *)
+               dst_alloc(&ip6_dst_blackhole_ops);
+       struct dst_entry *new = NULL;
+
+       if (rt) {
+               new = &rt->u.dst;
+
+               atomic_set(&new->__refcnt, 1);
+               new->__use = 1;
+               new->input = ip6_blackhole_output;
+               new->output = ip6_blackhole_output;
+
+               memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
+               new->dev = ort->u.dst.dev;
+               if (new->dev)
+                       dev_hold(new->dev);
+               rt->rt6i_idev = ort->rt6i_idev;
+               if (rt->rt6i_idev)
+                       in6_dev_hold(rt->rt6i_idev);
+               rt->rt6i_expires = 0;
+
+               ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
+               rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
+               rt->rt6i_metric = 0;
+
+               memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
+#ifdef CONFIG_IPV6_SUBTREES
+               memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
+#endif
+
+               dst_free(new);
+       }
+
+       dst_release(*dstp);
+       *dstp = new;
+       return (new ? 0 : -ENOMEM);
+}
+EXPORT_SYMBOL_GPL(ip6_dst_blackhole);
+
 /*
  *     Destination cache support functions
  */
@@ -1922,9 +1983,10 @@ static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
            !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
            (dst_mtu(&rt->u.dst) > arg->mtu ||
             (dst_mtu(&rt->u.dst) < arg->mtu &&
-             dst_mtu(&rt->u.dst) == idev->cnf.mtu6)))
+             dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) {
                rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
-       rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
+               rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
+       }
        return 0;
 }
 
@@ -1938,7 +2000,7 @@ void rt6_mtu_change(struct net_device *dev, unsigned mtu)
        fib6_clean_all(rt6_mtu_change_route, 0, &arg);
 }
 
-static struct nla_policy rtm_ipv6_policy[RTA_MAX+1] __read_mostly = {
+static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
        [RTA_GATEWAY]           = { .len = sizeof(struct in6_addr) },
        [RTA_OIF]               = { .type = NLA_U32 },
        [RTA_IIF]               = { .type = NLA_U32 },
@@ -2494,7 +2556,9 @@ void __init ip6_route_init(void)
 #endif
        ip6_dst_ops.kmem_cachep =
                kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
-                                 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+                                 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+       ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep;
+
        fib6_init();
 #ifdef         CONFIG_PROC_FS
        p = proc_net_create("ipv6_route", 0, rt6_proc_info);