1 files changed, 63 insertions, 0 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index b46ad53044b..1324b06796c 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);