1 files changed, 63 insertions, 0 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index b46ad53044ba..1324b06796c0 100644
--- 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
  */
@@ -2495,6 +2556,8 @@ void __init ip6_route_init(void)
         ip6_dst_ops.kmem_cachep =
                 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
                                   SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, 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);