[NETNS]: Make bind buckets live in net namespaces.

This tags the inet_bind_bucket struct with net pointer,
initializes it during creation and makes a filtering
during lookup.

A better hashfn, that takes the net into account is to
be done in the future, but currently all bind buckets
with similar port will be in one hash chain.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index a34a8f2..55532b9 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -74,6 +74,7 @@
  * ports are created in O(1) time?  I thought so. ;-)	-DaveM
  */
 struct inet_bind_bucket {
+	struct net		*ib_net;
 	unsigned short		port;
 	signed short		fastreuse;
 	struct hlist_node	node;
@@ -194,6 +195,7 @@
 
 extern struct inet_bind_bucket *
 		    inet_bind_bucket_create(struct kmem_cache *cachep,
+					    struct net *net,
 					    struct inet_bind_hashbucket *head,
 					    const unsigned short snum);
 extern void inet_bind_bucket_destroy(struct kmem_cache *cachep,