diff options
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/inet_hashtables.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h index 6731df2cea6..1c4fa0065a8 100644 --- 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 */ |