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Diffstat (limited to 'net/ipv6/route.c')
-rw-r--r--net/ipv6/route.c63
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);