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[INET]: Generalise tcp_v4_lookup_listener

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[acme@toy net-2.6.14]$ grep built-in /tmp/before /tmp/after
/tmp/before: 282560       13122    9312  304994   4a762 net/ipv4/built-in.o
/tmp/after:  282560       13122    9312  304994   4a762 net/ipv4/built-in.o

Will be used in DCCP, not exporting it right now not to get in Adrian
Bunk's exported-but-not-used-on-modules radar 8)

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo
2005-08-09 20:09:06 -07:00
committed by David S. Miller
parent 81849d106b
commit 33b6223190
3 changed files with 82 additions and 76 deletions
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36
include/net/inet_hashtables.h
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@@ -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 */