[INET6_HASHTABLES]: Move inet6_lookup functions to net/ipv6/inet6_hashtables.c
[linux-2.6] / net / ipv6 / inet6_hashtables.c
1 /*
2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
3  *              operating system.  INET is implemented using the BSD Socket
4  *              interface as the means of communication with the user level.
5  *
6  *              Generic INET6 transport hashtables
7  *
8  * Authors:     Lotsa people, from code originally in tcp
9  *
10  *      This program is free software; you can redistribute it and/or
11  *      modify it under the terms of the GNU General Public License
12  *      as published by the Free Software Foundation; either version
13  *      2 of the License, or (at your option) any later version.
14  */
15
16 #include <linux/config.h>
17
18 #include <linux/module.h>
19
20 #include <net/inet_connection_sock.h>
21 #include <net/inet_hashtables.h>
22 #include <net/inet6_hashtables.h>
23
24 struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo,
25                                    const struct in6_addr *daddr,
26                                    const unsigned short hnum, const int dif)
27 {
28         struct sock *sk;
29         const struct hlist_node *node;
30         struct sock *result = NULL;
31         int score, hiscore = 0;
32
33         read_lock(&hashinfo->lhash_lock);
34         sk_for_each(sk, node, &hashinfo->listening_hash[inet_lhashfn(hnum)]) {
35                 if (inet_sk(sk)->num == hnum && sk->sk_family == PF_INET6) {
36                         const struct ipv6_pinfo *np = inet6_sk(sk);
37                         
38                         score = 1;
39                         if (!ipv6_addr_any(&np->rcv_saddr)) {
40                                 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
41                                         continue;
42                                 score++;
43                         }
44                         if (sk->sk_bound_dev_if) {
45                                 if (sk->sk_bound_dev_if != dif)
46                                         continue;
47                                 score++;
48                         }
49                         if (score == 3) {
50                                 result = sk;
51                                 break;
52                         }
53                         if (score > hiscore) {
54                                 hiscore = score;
55                                 result = sk;
56                         }
57                 }
58         }
59         if (result)
60                 sock_hold(result);
61         read_unlock(&hashinfo->lhash_lock);
62         return result;
63 }
64
65 EXPORT_SYMBOL_GPL(inet6_lookup_listener);
66
67 struct sock *inet6_lookup(struct inet_hashinfo *hashinfo,
68                           const struct in6_addr *saddr, const u16 sport,
69                           const struct in6_addr *daddr, const u16 dport,
70                           const int dif)
71 {
72         struct sock *sk;
73
74         local_bh_disable();
75         sk = __inet6_lookup(hashinfo, saddr, sport, daddr, ntohs(dport), dif);
76         local_bh_enable();
77
78         return sk;
79 }
80
81 EXPORT_SYMBOL_GPL(inet6_lookup);