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Diffstat (limited to 'net/ipv4/inet_hashtables.c')
-rw-r--r--net/ipv4/inet_hashtables.c33
1 files changed, 31 insertions, 2 deletions
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 95fac5532994..fb296c9a7f3f 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -124,8 +124,10 @@ EXPORT_SYMBOL(inet_listen_wlock);
* remote address for the connection. So always assume those are both
* wildcarded during the search since they can never be otherwise.
*/
-struct sock *__inet_lookup_listener(const struct hlist_head *head, const u32 daddr,
- const unsigned short hnum, const int dif)
+static struct sock *inet_lookup_listener_slow(const struct hlist_head *head,
+ const u32 daddr,
+ const unsigned short hnum,
+ const int dif)
{
struct sock *result = NULL, *sk;
const struct hlist_node *node;
@@ -159,6 +161,33 @@ struct sock *__inet_lookup_listener(const struct hlist_head *head, const u32 dad
return result;
}
+/* Optimize the common listener case. */
+struct sock *__inet_lookup_listener(struct inet_hashinfo *hashinfo,
+ const u32 daddr, const unsigned short hnum,
+ const int dif)
+{
+ struct sock *sk = NULL;
+ const 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_slow(head, daddr, hnum, dif);
+ }
+ if (sk) {
+sherry_cache:
+ sock_hold(sk);
+ }
+ read_unlock(&hashinfo->lhash_lock);
+ return sk;
+}
EXPORT_SYMBOL_GPL(__inet_lookup_listener);
/* called with local bh disabled */