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); | |
c25eb3bf | 36 | __sk_nulls_add_node_rcu(sk, &ilb->head); |
5caea4ea | 37 | spin_unlock(&ilb->lock); |
b1a7ffcb DV |
38 | } else { |
39 | unsigned int hash; | |
3ab5aee7 | 40 | struct hlist_nulls_head *list; |
9db66bdc | 41 | spinlock_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); | |
9db66bdc | 46 | spin_lock(lock); |
3ab5aee7 | 47 | __sk_nulls_add_node_rcu(sk, list); |
9db66bdc | 48 | spin_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 | ||
c25eb3bf ED |
121 | static int inline compute_score(struct sock *sk, struct net *net, |
122 | const unsigned short hnum, | |
123 | const struct in6_addr *daddr, | |
124 | const int dif) | |
125 | { | |
126 | int score = -1; | |
127 | ||
128 | if (net_eq(sock_net(sk), net) && inet_sk(sk)->num == hnum && | |
129 | sk->sk_family == PF_INET6) { | |
130 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
131 | ||
132 | score = 1; | |
133 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
134 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) | |
135 | return -1; | |
136 | score++; | |
137 | } | |
138 | if (sk->sk_bound_dev_if) { | |
139 | if (sk->sk_bound_dev_if != dif) | |
140 | return -1; | |
141 | score++; | |
142 | } | |
143 | } | |
144 | return score; | |
145 | } | |
146 | ||
d86e0dac PE |
147 | struct sock *inet6_lookup_listener(struct net *net, |
148 | struct inet_hashinfo *hashinfo, const struct in6_addr *daddr, | |
149 | const unsigned short hnum, const int dif) | |
5324a040 ACM |
150 | { |
151 | struct sock *sk; | |
c25eb3bf ED |
152 | const struct hlist_nulls_node *node; |
153 | struct sock *result; | |
154 | int score, hiscore; | |
155 | unsigned int hash = inet_lhashfn(net, hnum); | |
156 | struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash]; | |
157 | ||
158 | rcu_read_lock(); | |
159 | begin: | |
160 | result = NULL; | |
161 | hiscore = -1; | |
162 | sk_nulls_for_each(sk, node, &ilb->head) { | |
163 | score = compute_score(sk, net, hnum, daddr, dif); | |
164 | if (score > hiscore) { | |
165 | hiscore = score; | |
166 | result = sk; | |
5324a040 ACM |
167 | } |
168 | } | |
c25eb3bf ED |
169 | /* |
170 | * if the nulls value we got at the end of this lookup is | |
171 | * not the expected one, we must restart lookup. | |
172 | * We probably met an item that was moved to another chain. | |
173 | */ | |
174 | if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE) | |
175 | goto begin; | |
176 | if (result) { | |
177 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) | |
178 | result = NULL; | |
179 | else if (unlikely(compute_score(result, net, hnum, daddr, | |
180 | dif) < hiscore)) { | |
181 | sock_put(result); | |
182 | goto begin; | |
183 | } | |
184 | } | |
185 | rcu_read_unlock(); | |
5324a040 ACM |
186 | return result; |
187 | } | |
188 | ||
189 | EXPORT_SYMBOL_GPL(inet6_lookup_listener); | |
190 | ||
d86e0dac | 191 | struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
d2ecd9cc AV |
192 | const struct in6_addr *saddr, const __be16 sport, |
193 | const struct in6_addr *daddr, const __be16 dport, | |
5324a040 ACM |
194 | const int dif) |
195 | { | |
196 | struct sock *sk; | |
197 | ||
198 | local_bh_disable(); | |
d86e0dac | 199 | sk = __inet6_lookup(net, hashinfo, saddr, sport, daddr, ntohs(dport), dif); |
5324a040 ACM |
200 | local_bh_enable(); |
201 | ||
202 | return sk; | |
203 | } | |
204 | ||
205 | EXPORT_SYMBOL_GPL(inet6_lookup); | |
d8313f5c ACM |
206 | |
207 | static int __inet6_check_established(struct inet_timewait_death_row *death_row, | |
208 | struct sock *sk, const __u16 lport, | |
209 | struct inet_timewait_sock **twp) | |
210 | { | |
211 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
3759fa9c | 212 | struct inet_sock *inet = inet_sk(sk); |
d8313f5c ACM |
213 | const struct ipv6_pinfo *np = inet6_sk(sk); |
214 | const struct in6_addr *daddr = &np->rcv_saddr; | |
215 | const struct in6_addr *saddr = &np->daddr; | |
216 | const int dif = sk->sk_bound_dev_if; | |
4f765d84 | 217 | const __portpair ports = INET_COMBINED_PORTS(inet->dport, lport); |
33de014c PE |
218 | struct net *net = sock_net(sk); |
219 | const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr, | |
d8313f5c ACM |
220 | inet->dport); |
221 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); | |
9db66bdc | 222 | spinlock_t *lock = inet_ehash_lockp(hinfo, hash); |
d8313f5c | 223 | struct sock *sk2; |
3ab5aee7 | 224 | const struct hlist_nulls_node *node; |
d8313f5c ACM |
225 | struct inet_timewait_sock *tw; |
226 | ||
9db66bdc | 227 | spin_lock(lock); |
d8313f5c ACM |
228 | |
229 | /* Check TIME-WAIT sockets first. */ | |
3ab5aee7 | 230 | sk_nulls_for_each(sk2, node, &head->twchain) { |
d8313f5c ACM |
231 | tw = inet_twsk(sk2); |
232 | ||
d86e0dac | 233 | if (INET6_TW_MATCH(sk2, net, hash, saddr, daddr, ports, dif)) { |
d8313f5c ACM |
234 | if (twsk_unique(sk, sk2, twp)) |
235 | goto unique; | |
236 | else | |
237 | goto not_unique; | |
238 | } | |
239 | } | |
240 | tw = NULL; | |
241 | ||
242 | /* And established part... */ | |
3ab5aee7 | 243 | sk_nulls_for_each(sk2, node, &head->chain) { |
d86e0dac | 244 | if (INET6_MATCH(sk2, net, hash, saddr, daddr, ports, dif)) |
d8313f5c ACM |
245 | goto not_unique; |
246 | } | |
247 | ||
248 | unique: | |
3759fa9c HX |
249 | /* Must record num and sport now. Otherwise we will see |
250 | * in hash table socket with a funny identity. */ | |
251 | inet->num = lport; | |
252 | inet->sport = htons(lport); | |
547b792c | 253 | WARN_ON(!sk_unhashed(sk)); |
3ab5aee7 | 254 | __sk_nulls_add_node_rcu(sk, &head->chain); |
d8313f5c | 255 | sk->sk_hash = hash; |
9db66bdc | 256 | spin_unlock(lock); |
c29a0bc4 | 257 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
d8313f5c ACM |
258 | |
259 | if (twp != NULL) { | |
260 | *twp = tw; | |
3f53a381 | 261 | NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); |
d8313f5c ACM |
262 | } else if (tw != NULL) { |
263 | /* Silly. Should hash-dance instead... */ | |
264 | inet_twsk_deschedule(tw, death_row); | |
3f53a381 | 265 | NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); |
d8313f5c ACM |
266 | |
267 | inet_twsk_put(tw); | |
268 | } | |
269 | return 0; | |
270 | ||
271 | not_unique: | |
9db66bdc | 272 | spin_unlock(lock); |
d8313f5c ACM |
273 | return -EADDRNOTAVAIL; |
274 | } | |
275 | ||
276 | static inline u32 inet6_sk_port_offset(const struct sock *sk) | |
277 | { | |
278 | const struct inet_sock *inet = inet_sk(sk); | |
279 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
280 | return secure_ipv6_port_ephemeral(np->rcv_saddr.s6_addr32, | |
281 | np->daddr.s6_addr32, | |
282 | inet->dport); | |
283 | } | |
284 | ||
285 | int inet6_hash_connect(struct inet_timewait_death_row *death_row, | |
286 | struct sock *sk) | |
287 | { | |
5d8c0aa9 | 288 | return __inet_hash_connect(death_row, sk, inet6_sk_port_offset(sk), |
5ee31fc1 | 289 | __inet6_check_established, __inet6_hash); |
d8313f5c ACM |
290 | } |
291 | ||
292 | EXPORT_SYMBOL_GPL(inet6_hash_connect); |