- struct inet_bind_hashbucket *head;
- struct inet_bind_bucket *tb;
- struct hlist_node *node;
- int ret;
-
- local_bh_disable();
- if (snum == 0) {
- int low = sysctl_local_port_range[0];
- int high = sysctl_local_port_range[1];
- int remaining = (high - low) + 1;
- int rover;
-
- spin_lock(&tcp_hashinfo.portalloc_lock);
- if (tcp_hashinfo.port_rover < low)
- rover = low;
- else
- rover = tcp_hashinfo.port_rover;
- do { rover++;
- if (rover > high)
- rover = low;
- head = &tcp_hashinfo.bhash[inet_bhashfn(rover, tcp_hashinfo.bhash_size)];
- spin_lock(&head->lock);
- inet_bind_bucket_for_each(tb, node, &head->chain)
- if (tb->port == rover)
- goto next;
- break;
- next:
- spin_unlock(&head->lock);
- } while (--remaining > 0);
- tcp_hashinfo.port_rover = rover;
- spin_unlock(&tcp_hashinfo.portalloc_lock);
-
- /* Exhausted local port range during search? It is not
- * possible for us to be holding one of the bind hash
- * locks if this test triggers, because if 'remaining'
- * drops to zero, we broke out of the do/while loop at
- * the top level, not from the 'break;' statement.
- */
- ret = 1;
- if (unlikely(remaining <= 0))
- goto fail;
-
- /* OK, here is the one we will use. */
- snum = rover;
- } else {
- head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)];
- spin_lock(&head->lock);
- inet_bind_bucket_for_each(tb, node, &head->chain)
- if (tb->port == snum)
- goto tb_found;
- }
- tb = NULL;
- goto tb_not_found;
-tb_found:
- if (tb && !hlist_empty(&tb->owners)) {
- if (tb->fastreuse > 0 && sk->sk_reuse &&
- sk->sk_state != TCP_LISTEN) {
- goto success;
- } else {
- ret = 1;
- if (tcp_v6_bind_conflict(sk, tb))
- goto fail_unlock;
- }
- }
-tb_not_found:
- ret = 1;
- if (tb == NULL) {
- tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, head, snum);
- if (tb == NULL)
- goto fail_unlock;
- }
- if (hlist_empty(&tb->owners)) {
- if (sk->sk_reuse && sk->sk_state != TCP_LISTEN)
- tb->fastreuse = 1;
- else
- tb->fastreuse = 0;
- } else if (tb->fastreuse &&
- (!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
- tb->fastreuse = 0;
-
-success:
- if (!inet_csk(sk)->icsk_bind_hash)
- inet_bind_hash(sk, tb, snum);
- BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb);
- ret = 0;
-
-fail_unlock:
- spin_unlock(&head->lock);
-fail:
- local_bh_enable();
- return ret;
-}
-
-static __inline__ void __tcp_v6_hash(struct sock *sk)
-{
- struct hlist_head *list;
- rwlock_t *lock;
-
- BUG_TRAP(sk_unhashed(sk));
-
- if (sk->sk_state == TCP_LISTEN) {
- list = &tcp_hashinfo.listening_hash[inet_sk_listen_hashfn(sk)];
- lock = &tcp_hashinfo.lhash_lock;
- inet_listen_wlock(&tcp_hashinfo);
- } else {
- unsigned int hash;
- sk->sk_hash = hash = inet6_sk_ehashfn(sk);
- hash &= (tcp_hashinfo.ehash_size - 1);
- list = &tcp_hashinfo.ehash[hash].chain;
- lock = &tcp_hashinfo.ehash[hash].lock;
- write_lock(lock);
- }
-
- __sk_add_node(sk, list);
- sock_prot_inc_use(sk->sk_prot);
- write_unlock(lock);