[INET]: Generalise tcp_v4_lookup_listener

[pandora-kernel.git] / include / net / inet_hashtables.h

diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 6731df2..1c4fa00 100644 (file)
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -16,8 +16,10 @@
 
 #include <linux/interrupt.h>
 #include <linux/ip.h>
+#include <linux/ipv6.h>
 #include <linux/list.h>
 #include <linux/slab.h>
+#include <linux/socket.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 #include <linux/wait.h>
@@ -274,4 +276,38 @@ out:
        if (sk->sk_state == TCP_LISTEN)
                wake_up(&hashinfo->lhash_wait);
 }
+
+extern struct sock *__inet_lookup_listener(const struct hlist_head *head,
+                                          const u32 daddr,
+                                          const unsigned short hnum,
+                                          const int dif);
+
+/* Optimize the common listener case. */
+static inline struct sock *inet_lookup_listener(struct inet_hashinfo *hashinfo,
+                                               const u32 daddr,
+                                               const unsigned short hnum,
+                                               const int dif)
+{
+       struct sock *sk = NULL;
+       struct hlist_head *head;
+
+       read_lock(&hashinfo->lhash_lock);
+       head = &hashinfo->listening_hash[inet_lhashfn(hnum)];
+       if (!hlist_empty(head)) {
+               const struct inet_sock *inet = inet_sk((sk = __sk_head(head)));
+
+               if (inet->num == hnum && !sk->sk_node.next &&
+                   (!inet->rcv_saddr || inet->rcv_saddr == daddr) &&
+                   (sk->sk_family == PF_INET || !ipv6_only_sock(sk)) &&
+                   !sk->sk_bound_dev_if)
+                       goto sherry_cache;
+               sk = __inet_lookup_listener(head, daddr, hnum, dif);
+       }
+       if (sk) {
+sherry_cache:
+               sock_hold(sk);
+       }
+       read_unlock(&hashinfo->lhash_lock);
+       return sk;
+}
 #endif /* _INET_HASHTABLES_H */