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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 *
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -08008 * Authors: Lotsa people, from code originally in tcp, generalised here
9 * by Arnaldo Carvalho de Melo <acme@mandriva.com>
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030010 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030017#include <linux/module.h>
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -080018#include <linux/random.h>
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030019
20#include <net/inet_connection_sock.h>
21#include <net/inet_hashtables.h>
22#include <net/inet6_hashtables.h>
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -080023#include <net/ip.h>
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -030024
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080025void __inet6_hash(struct sock *sk)
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070026{
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080027 struct inet_hashinfo *hashinfo = sk->sk_prot->hashinfo;
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070028 struct hlist_head *list;
29 rwlock_t *lock;
30
31 BUG_TRAP(sk_unhashed(sk));
32
33 if (sk->sk_state == TCP_LISTEN) {
34 list = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
35 lock = &hashinfo->lhash_lock;
36 inet_listen_wlock(hashinfo);
37 } else {
38 unsigned int hash;
39 sk->sk_hash = hash = inet6_sk_ehashfn(sk);
Eric Dumazet230140c2007-11-07 02:40:20 -080040 list = &inet_ehash_bucket(hashinfo, hash)->chain;
41 lock = inet_ehash_lockp(hashinfo, hash);
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070042 write_lock(lock);
43 }
44
45 __sk_add_node(sk, list);
Eric Dumazet65f76512008-01-03 20:46:48 -080046 sock_prot_inuse_add(sk->sk_prot, 1);
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070047 write_unlock(lock);
48}
49EXPORT_SYMBOL(__inet6_hash);
50
51/*
52 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
53 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
54 *
55 * The sockhash lock must be held as a reader here.
56 */
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -080057struct sock *__inet6_lookup_established(struct net *net,
58 struct inet_hashinfo *hashinfo,
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070059 const struct in6_addr *saddr,
Al Virod2ecd9c2006-11-08 00:20:00 -080060 const __be16 sport,
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070061 const struct in6_addr *daddr,
62 const u16 hnum,
63 const int dif)
64{
65 struct sock *sk;
66 const struct hlist_node *node;
Al Viro4f765d82006-09-27 18:43:07 -070067 const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070068 /* Optimize here for direct hit, only listening connections can
69 * have wildcards anyways.
70 */
71 unsigned int hash = inet6_ehashfn(daddr, hnum, saddr, sport);
72 struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash);
Eric Dumazet230140c2007-11-07 02:40:20 -080073 rwlock_t *lock = inet_ehash_lockp(hashinfo, hash);
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070074
75 prefetch(head->chain.first);
Eric Dumazet230140c2007-11-07 02:40:20 -080076 read_lock(lock);
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070077 sk_for_each(sk, node, &head->chain) {
78 /* For IPV6 do the cheaper port and family tests first. */
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -080079 if (INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif))
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070080 goto hit; /* You sunk my battleship! */
81 }
82 /* Must check for a TIME_WAIT'er before going to listener hash. */
Eric Dumazetdbca9b2752007-02-08 14:16:46 -080083 sk_for_each(sk, node, &head->twchain) {
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -080084 if (INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif))
Pavel Emelyanov535174e2008-01-31 05:03:27 -080085 goto hit;
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070086 }
Eric Dumazet230140c2007-11-07 02:40:20 -080087 read_unlock(lock);
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070088 return NULL;
89
90hit:
91 sock_hold(sk);
Eric Dumazet230140c2007-11-07 02:40:20 -080092 read_unlock(lock);
Denis Vlasenkob1a7ffc2006-04-09 22:48:59 -070093 return sk;
94}
95EXPORT_SYMBOL(__inet6_lookup_established);
96
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -080097struct sock *inet6_lookup_listener(struct net *net,
98 struct inet_hashinfo *hashinfo, const struct in6_addr *daddr,
99 const unsigned short hnum, const int dif)
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -0300100{
101 struct sock *sk;
102 const struct hlist_node *node;
103 struct sock *result = NULL;
104 int score, hiscore = 0;
105
106 read_lock(&hashinfo->lhash_lock);
107 sk_for_each(sk, node, &hashinfo->listening_hash[inet_lhashfn(hnum)]) {
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800108 if (sk->sk_net == net && inet_sk(sk)->num == hnum &&
109 sk->sk_family == PF_INET6) {
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -0300110 const struct ipv6_pinfo *np = inet6_sk(sk);
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900111
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -0300112 score = 1;
113 if (!ipv6_addr_any(&np->rcv_saddr)) {
114 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
115 continue;
116 score++;
117 }
118 if (sk->sk_bound_dev_if) {
119 if (sk->sk_bound_dev_if != dif)
120 continue;
121 score++;
122 }
123 if (score == 3) {
124 result = sk;
125 break;
126 }
127 if (score > hiscore) {
128 hiscore = score;
129 result = sk;
130 }
131 }
132 }
133 if (result)
134 sock_hold(result);
135 read_unlock(&hashinfo->lhash_lock);
136 return result;
137}
138
139EXPORT_SYMBOL_GPL(inet6_lookup_listener);
140
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800141struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
Al Virod2ecd9c2006-11-08 00:20:00 -0800142 const struct in6_addr *saddr, const __be16 sport,
143 const struct in6_addr *daddr, const __be16 dport,
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -0300144 const int dif)
145{
146 struct sock *sk;
147
148 local_bh_disable();
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800149 sk = __inet6_lookup(net, hashinfo, saddr, sport, daddr, ntohs(dport), dif);
Arnaldo Carvalho de Melo5324a042005-08-12 09:26:18 -0300150 local_bh_enable();
151
152 return sk;
153}
154
155EXPORT_SYMBOL_GPL(inet6_lookup);
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800156
157static int __inet6_check_established(struct inet_timewait_death_row *death_row,
158 struct sock *sk, const __u16 lport,
159 struct inet_timewait_sock **twp)
160{
161 struct inet_hashinfo *hinfo = death_row->hashinfo;
Herbert Xu3759fa92006-03-13 14:26:12 -0800162 struct inet_sock *inet = inet_sk(sk);
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800163 const struct ipv6_pinfo *np = inet6_sk(sk);
164 const struct in6_addr *daddr = &np->rcv_saddr;
165 const struct in6_addr *saddr = &np->daddr;
166 const int dif = sk->sk_bound_dev_if;
Al Viro4f765d82006-09-27 18:43:07 -0700167 const __portpair ports = INET_COMBINED_PORTS(inet->dport, lport);
YOSHIFUJI Hideaki6e1d9d02007-02-12 20:26:39 -0800168 const unsigned int hash = inet6_ehashfn(daddr, lport, saddr,
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800169 inet->dport);
170 struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
Eric Dumazet230140c2007-11-07 02:40:20 -0800171 rwlock_t *lock = inet_ehash_lockp(hinfo, hash);
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800172 struct sock *sk2;
173 const struct hlist_node *node;
174 struct inet_timewait_sock *tw;
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800175 struct net *net = sk->sk_net;
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800176
177 prefetch(head->chain.first);
Eric Dumazet230140c2007-11-07 02:40:20 -0800178 write_lock(lock);
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800179
180 /* Check TIME-WAIT sockets first. */
Eric Dumazetdbca9b2752007-02-08 14:16:46 -0800181 sk_for_each(sk2, node, &head->twchain) {
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800182 tw = inet_twsk(sk2);
183
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800184 if (INET6_TW_MATCH(sk2, net, hash, saddr, daddr, ports, dif)) {
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800185 if (twsk_unique(sk, sk2, twp))
186 goto unique;
187 else
188 goto not_unique;
189 }
190 }
191 tw = NULL;
192
193 /* And established part... */
194 sk_for_each(sk2, node, &head->chain) {
Pavel Emelyanovd86e0da2008-01-31 05:07:21 -0800195 if (INET6_MATCH(sk2, net, hash, saddr, daddr, ports, dif))
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800196 goto not_unique;
197 }
198
199unique:
Herbert Xu3759fa92006-03-13 14:26:12 -0800200 /* Must record num and sport now. Otherwise we will see
201 * in hash table socket with a funny identity. */
202 inet->num = lport;
203 inet->sport = htons(lport);
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800204 BUG_TRAP(sk_unhashed(sk));
205 __sk_add_node(sk, &head->chain);
206 sk->sk_hash = hash;
Eric Dumazet65f76512008-01-03 20:46:48 -0800207 sock_prot_inuse_add(sk->sk_prot, 1);
Eric Dumazet230140c2007-11-07 02:40:20 -0800208 write_unlock(lock);
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800209
210 if (twp != NULL) {
211 *twp = tw;
212 NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
213 } else if (tw != NULL) {
214 /* Silly. Should hash-dance instead... */
215 inet_twsk_deschedule(tw, death_row);
216 NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
217
218 inet_twsk_put(tw);
219 }
220 return 0;
221
222not_unique:
Eric Dumazet230140c2007-11-07 02:40:20 -0800223 write_unlock(lock);
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800224 return -EADDRNOTAVAIL;
225}
226
227static inline u32 inet6_sk_port_offset(const struct sock *sk)
228{
229 const struct inet_sock *inet = inet_sk(sk);
230 const struct ipv6_pinfo *np = inet6_sk(sk);
231 return secure_ipv6_port_ephemeral(np->rcv_saddr.s6_addr32,
232 np->daddr.s6_addr32,
233 inet->dport);
234}
235
236int inet6_hash_connect(struct inet_timewait_death_row *death_row,
237 struct sock *sk)
238{
Pavel Emelyanov5d8c0aa2008-02-05 03:14:44 -0800239 return __inet_hash_connect(death_row, sk, inet6_sk_port_offset(sk),
Pavel Emelyanov5ee31fc2008-01-31 05:04:45 -0800240 __inet6_check_established, __inet6_hash);
Arnaldo Carvalho de Melod8313f52005-12-13 23:25:44 -0800241}
242
243EXPORT_SYMBOL_GPL(inet6_hash_connect);