Commit | Line | Data |
---|---|---|
5324a040 ACM |
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 | * | |
d8313f5c ACM |
8 | * Authors: Lotsa people, from code originally in tcp, generalised here |
9 | * by Arnaldo Carvalho de Melo <acme@mandriva.com> | |
5324a040 ACM |
10 | * |
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 | ||
5324a040 | 17 | #include <linux/module.h> |
d8313f5c | 18 | #include <linux/random.h> |
5324a040 ACM |
19 | |
20 | #include <net/inet_connection_sock.h> | |
21 | #include <net/inet_hashtables.h> | |
22 | #include <net/inet6_hashtables.h> | |
d8313f5c | 23 | #include <net/ip.h> |
5324a040 | 24 | |
ab1e0a13 | 25 | void __inet6_hash(struct sock *sk) |
b1a7ffcb | 26 | { |
39d8cda7 | 27 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
b1a7ffcb | 28 | |
547b792c | 29 | WARN_ON(!sk_unhashed(sk)); |
b1a7ffcb DV |
30 | |
31 | if (sk->sk_state == TCP_LISTEN) { | |
5caea4ea | 32 | struct inet_listen_hashbucket *ilb; |
3ab5aee7 | 33 | |
5caea4ea ED |
34 | ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; |
35 | spin_lock(&ilb->lock); | |
36 | __sk_add_node(sk, &ilb->head); | |
37 | spin_unlock(&ilb->lock); | |
b1a7ffcb DV |
38 | } else { |
39 | unsigned int hash; | |
3ab5aee7 | 40 | struct hlist_nulls_head *list; |
5caea4ea | 41 | rwlock_t *lock; |
3ab5aee7 | 42 | |
b1a7ffcb | 43 | sk->sk_hash = hash = inet6_sk_ehashfn(sk); |
230140cf ED |
44 | list = &inet_ehash_bucket(hashinfo, hash)->chain; |
45 | lock = inet_ehash_lockp(hashinfo, hash); | |
b1a7ffcb | 46 | write_lock(lock); |
3ab5aee7 | 47 | __sk_nulls_add_node_rcu(sk, list); |
5caea4ea | 48 | write_unlock(lock); |
b1a7ffcb DV |
49 | } |
50 | ||
c29a0bc4 | 51 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
b1a7ffcb DV |
52 | } |
53 | EXPORT_SYMBOL(__inet6_hash); | |
54 | ||
55 | /* | |
56 | * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so | |
57 | * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM | |
58 | * | |
59 | * The sockhash lock must be held as a reader here. | |
60 | */ | |
d86e0dac PE |
61 | struct sock *__inet6_lookup_established(struct net *net, |
62 | struct inet_hashinfo *hashinfo, | |
b1a7ffcb | 63 | const struct in6_addr *saddr, |
d2ecd9cc | 64 | const __be16 sport, |
b1a7ffcb DV |
65 | const struct in6_addr *daddr, |
66 | const u16 hnum, | |
67 | const int dif) | |
68 | { | |
69 | struct sock *sk; | |
3ab5aee7 | 70 | const struct hlist_nulls_node *node; |
4f765d84 | 71 | const __portpair ports = INET_COMBINED_PORTS(sport, hnum); |
b1a7ffcb DV |
72 | /* Optimize here for direct hit, only listening connections can |
73 | * have wildcards anyways. | |
74 | */ | |
33de014c | 75 | unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport); |
3ab5aee7 ED |
76 | unsigned int slot = hash & (hashinfo->ehash_size - 1); |
77 | struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; | |
b1a7ffcb | 78 | |
3ab5aee7 ED |
79 | |
80 | rcu_read_lock(); | |
81 | begin: | |
82 | sk_nulls_for_each_rcu(sk, node, &head->chain) { | |
b1a7ffcb | 83 | /* For IPV6 do the cheaper port and family tests first. */ |
3ab5aee7 ED |
84 | if (INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { |
85 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) | |
86 | goto begintw; | |
87 | if (!INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { | |
88 | sock_put(sk); | |
89 | goto begin; | |
90 | } | |
91 | goto out; | |
92 | } | |
b1a7ffcb | 93 | } |
3ab5aee7 ED |
94 | if (get_nulls_value(node) != slot) |
95 | goto begin; | |
96 | ||
97 | begintw: | |
b1a7ffcb | 98 | /* Must check for a TIME_WAIT'er before going to listener hash. */ |
3ab5aee7 ED |
99 | sk_nulls_for_each_rcu(sk, node, &head->twchain) { |
100 | if (INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { | |
101 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) { | |
102 | sk = NULL; | |
103 | goto out; | |
104 | } | |
105 | if (!INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { | |
106 | sock_put(sk); | |
107 | goto begintw; | |
108 | } | |
109 | goto out; | |
110 | } | |
b1a7ffcb | 111 | } |
3ab5aee7 ED |
112 | if (get_nulls_value(node) != slot) |
113 | goto begintw; | |
114 | sk = NULL; | |
115 | out: | |
116 | rcu_read_unlock(); | |
b1a7ffcb DV |
117 | return sk; |
118 | } | |
119 | EXPORT_SYMBOL(__inet6_lookup_established); | |
120 | ||
d86e0dac PE |
121 | struct sock *inet6_lookup_listener(struct net *net, |
122 | struct inet_hashinfo *hashinfo, const struct in6_addr *daddr, | |
123 | const unsigned short hnum, const int dif) | |
5324a040 ACM |
124 | { |
125 | struct sock *sk; | |
126 | const struct hlist_node *node; | |
127 | struct sock *result = NULL; | |
128 | int score, hiscore = 0; | |
5caea4ea | 129 | struct inet_listen_hashbucket *ilb; |
5324a040 | 130 | |
5caea4ea ED |
131 | ilb = &hashinfo->listening_hash[inet_lhashfn(net, hnum)]; |
132 | spin_lock(&ilb->lock); | |
133 | sk_for_each(sk, node, &ilb->head) { | |
878628fb | 134 | if (net_eq(sock_net(sk), net) && inet_sk(sk)->num == hnum && |
d86e0dac | 135 | sk->sk_family == PF_INET6) { |
5324a040 | 136 | const struct ipv6_pinfo *np = inet6_sk(sk); |
1ab1457c | 137 | |
5324a040 ACM |
138 | score = 1; |
139 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
140 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) | |
141 | continue; | |
142 | score++; | |
143 | } | |
144 | if (sk->sk_bound_dev_if) { | |
145 | if (sk->sk_bound_dev_if != dif) | |
146 | continue; | |
147 | score++; | |
148 | } | |
149 | if (score == 3) { | |
150 | result = sk; | |
151 | break; | |
152 | } | |
153 | if (score > hiscore) { | |
154 | hiscore = score; | |
155 | result = sk; | |
156 | } | |
157 | } | |
158 | } | |
159 | if (result) | |
160 | sock_hold(result); | |
5caea4ea | 161 | spin_unlock(&ilb->lock); |
5324a040 ACM |
162 | return result; |
163 | } | |
164 | ||
165 | EXPORT_SYMBOL_GPL(inet6_lookup_listener); | |
166 | ||
d86e0dac | 167 | struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
d2ecd9cc AV |
168 | const struct in6_addr *saddr, const __be16 sport, |
169 | const struct in6_addr *daddr, const __be16 dport, | |
5324a040 ACM |
170 | const int dif) |
171 | { | |
172 | struct sock *sk; | |
173 | ||
174 | local_bh_disable(); | |
d86e0dac | 175 | sk = __inet6_lookup(net, hashinfo, saddr, sport, daddr, ntohs(dport), dif); |
5324a040 ACM |
176 | local_bh_enable(); |
177 | ||
178 | return sk; | |
179 | } | |
180 | ||
181 | EXPORT_SYMBOL_GPL(inet6_lookup); | |
d8313f5c ACM |
182 | |
183 | static int __inet6_check_established(struct inet_timewait_death_row *death_row, | |
184 | struct sock *sk, const __u16 lport, | |
185 | struct inet_timewait_sock **twp) | |
186 | { | |
187 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
3759fa9c | 188 | struct inet_sock *inet = inet_sk(sk); |
d8313f5c ACM |
189 | const struct ipv6_pinfo *np = inet6_sk(sk); |
190 | const struct in6_addr *daddr = &np->rcv_saddr; | |
191 | const struct in6_addr *saddr = &np->daddr; | |
192 | const int dif = sk->sk_bound_dev_if; | |
4f765d84 | 193 | const __portpair ports = INET_COMBINED_PORTS(inet->dport, lport); |
33de014c PE |
194 | struct net *net = sock_net(sk); |
195 | const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr, | |
d8313f5c ACM |
196 | inet->dport); |
197 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); | |
230140cf | 198 | rwlock_t *lock = inet_ehash_lockp(hinfo, hash); |
d8313f5c | 199 | struct sock *sk2; |
3ab5aee7 | 200 | const struct hlist_nulls_node *node; |
d8313f5c ACM |
201 | struct inet_timewait_sock *tw; |
202 | ||
203 | prefetch(head->chain.first); | |
230140cf | 204 | write_lock(lock); |
d8313f5c ACM |
205 | |
206 | /* Check TIME-WAIT sockets first. */ | |
3ab5aee7 | 207 | sk_nulls_for_each(sk2, node, &head->twchain) { |
d8313f5c ACM |
208 | tw = inet_twsk(sk2); |
209 | ||
d86e0dac | 210 | if (INET6_TW_MATCH(sk2, net, hash, saddr, daddr, ports, dif)) { |
d8313f5c ACM |
211 | if (twsk_unique(sk, sk2, twp)) |
212 | goto unique; | |
213 | else | |
214 | goto not_unique; | |
215 | } | |
216 | } | |
217 | tw = NULL; | |
218 | ||
219 | /* And established part... */ | |
3ab5aee7 | 220 | sk_nulls_for_each(sk2, node, &head->chain) { |
d86e0dac | 221 | if (INET6_MATCH(sk2, net, hash, saddr, daddr, ports, dif)) |
d8313f5c ACM |
222 | goto not_unique; |
223 | } | |
224 | ||
225 | unique: | |
3759fa9c HX |
226 | /* Must record num and sport now. Otherwise we will see |
227 | * in hash table socket with a funny identity. */ | |
228 | inet->num = lport; | |
229 | inet->sport = htons(lport); | |
547b792c | 230 | WARN_ON(!sk_unhashed(sk)); |
3ab5aee7 | 231 | __sk_nulls_add_node_rcu(sk, &head->chain); |
d8313f5c | 232 | sk->sk_hash = hash; |
c29a0bc4 | 233 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
230140cf | 234 | write_unlock(lock); |
d8313f5c ACM |
235 | |
236 | if (twp != NULL) { | |
237 | *twp = tw; | |
de0744af | 238 | NET_INC_STATS_BH(twsk_net(tw), LINUX_MIB_TIMEWAITRECYCLED); |
d8313f5c ACM |
239 | } else if (tw != NULL) { |
240 | /* Silly. Should hash-dance instead... */ | |
241 | inet_twsk_deschedule(tw, death_row); | |
de0744af | 242 | NET_INC_STATS_BH(twsk_net(tw), LINUX_MIB_TIMEWAITRECYCLED); |
d8313f5c ACM |
243 | |
244 | inet_twsk_put(tw); | |
245 | } | |
246 | return 0; | |
247 | ||
248 | not_unique: | |
230140cf | 249 | write_unlock(lock); |
d8313f5c ACM |
250 | return -EADDRNOTAVAIL; |
251 | } | |
252 | ||
253 | static inline u32 inet6_sk_port_offset(const struct sock *sk) | |
254 | { | |
255 | const struct inet_sock *inet = inet_sk(sk); | |
256 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
257 | return secure_ipv6_port_ephemeral(np->rcv_saddr.s6_addr32, | |
258 | np->daddr.s6_addr32, | |
259 | inet->dport); | |
260 | } | |
261 | ||
262 | int inet6_hash_connect(struct inet_timewait_death_row *death_row, | |
263 | struct sock *sk) | |
264 | { | |
5d8c0aa9 | 265 | return __inet_hash_connect(death_row, sk, inet6_sk_port_offset(sk), |
5ee31fc1 | 266 | __inet6_check_established, __inet6_hash); |
d8313f5c ACM |
267 | } |
268 | ||
269 | EXPORT_SYMBOL_GPL(inet6_hash_connect); |