[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>

1 files changed, 6 insertions, 2 deletions

diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index b93d40ff6ef4..db1e53a865c2 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -28,12 +28,14 @@
  * The bindhash mutex for snum's hash chain must be held here.
  */
 struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
+                                                 struct net *net,
                                                  struct inet_bind_hashbucket *head,
                                                  const unsigned short snum)
 {
         struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
 
         if (tb != NULL) {
+                tb->ib_net       = net;
                 tb->port      = snum;
                 tb->fastreuse = 0;
                 INIT_HLIST_HEAD(&tb->owners);
@@ -359,6 +361,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
         struct inet_bind_hashbucket *head;
         struct inet_bind_bucket *tb;
         int ret;
+        struct net *net = sk->sk_net;
 
         if (!snum) {
                 int i, remaining, low, high, port;
@@ -381,7 +384,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
                          * unique enough.
                          */
                         inet_bind_bucket_for_each(tb, node, &head->chain) {
-                                if (tb->port == port) {
+                                if (tb->ib_net == net && tb->port == port) {
                                         BUG_TRAP(!hlist_empty(&tb->owners));
                                         if (tb->fastreuse >= 0)
                                                 goto next_port;
@@ -392,7 +395,8 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
                                 }
                         }
 
-                        tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep, head, port);
+                        tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
+                                        net, head, port);
                         if (!tb) {
                                 spin_unlock(&head->lock);
                                 break;