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Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -03001/*
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
24struct 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
65EXPORT_SYMBOL_GPL(inet6_lookup_listener);
66
67struct 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
81EXPORT_SYMBOL_GPL(inet6_lookup);