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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> | |
6e5714ea | 23 | #include <net/secure_seq.h> |
d8313f5c | 24 | #include <net/ip.h> |
5324a040 | 25 | |
9327f705 | 26 | int __inet6_hash(struct sock *sk, struct inet_timewait_sock *tw) |
b1a7ffcb | 27 | { |
39d8cda7 | 28 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
9327f705 | 29 | int twrefcnt = 0; |
b1a7ffcb | 30 | |
547b792c | 31 | WARN_ON(!sk_unhashed(sk)); |
b1a7ffcb DV |
32 | |
33 | if (sk->sk_state == TCP_LISTEN) { | |
5caea4ea | 34 | struct inet_listen_hashbucket *ilb; |
3ab5aee7 | 35 | |
5caea4ea ED |
36 | ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; |
37 | spin_lock(&ilb->lock); | |
c25eb3bf | 38 | __sk_nulls_add_node_rcu(sk, &ilb->head); |
5caea4ea | 39 | spin_unlock(&ilb->lock); |
b1a7ffcb DV |
40 | } else { |
41 | unsigned int hash; | |
3ab5aee7 | 42 | struct hlist_nulls_head *list; |
9db66bdc | 43 | spinlock_t *lock; |
3ab5aee7 | 44 | |
b1a7ffcb | 45 | sk->sk_hash = hash = inet6_sk_ehashfn(sk); |
230140cf ED |
46 | list = &inet_ehash_bucket(hashinfo, hash)->chain; |
47 | lock = inet_ehash_lockp(hashinfo, hash); | |
9db66bdc | 48 | spin_lock(lock); |
3ab5aee7 | 49 | __sk_nulls_add_node_rcu(sk, list); |
9327f705 ED |
50 | if (tw) { |
51 | WARN_ON(sk->sk_hash != tw->tw_hash); | |
52 | twrefcnt = inet_twsk_unhash(tw); | |
53 | } | |
9db66bdc | 54 | spin_unlock(lock); |
b1a7ffcb DV |
55 | } |
56 | ||
c29a0bc4 | 57 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
9327f705 | 58 | return twrefcnt; |
b1a7ffcb DV |
59 | } |
60 | EXPORT_SYMBOL(__inet6_hash); | |
61 | ||
62 | /* | |
63 | * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so | |
64 | * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM | |
65 | * | |
66 | * The sockhash lock must be held as a reader here. | |
67 | */ | |
d86e0dac PE |
68 | struct sock *__inet6_lookup_established(struct net *net, |
69 | struct inet_hashinfo *hashinfo, | |
b1a7ffcb | 70 | const struct in6_addr *saddr, |
d2ecd9cc | 71 | const __be16 sport, |
b1a7ffcb DV |
72 | const struct in6_addr *daddr, |
73 | const u16 hnum, | |
74 | const int dif) | |
75 | { | |
76 | struct sock *sk; | |
3ab5aee7 | 77 | const struct hlist_nulls_node *node; |
4f765d84 | 78 | const __portpair ports = INET_COMBINED_PORTS(sport, hnum); |
b1a7ffcb DV |
79 | /* Optimize here for direct hit, only listening connections can |
80 | * have wildcards anyways. | |
81 | */ | |
33de014c | 82 | unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport); |
f373b53b | 83 | unsigned int slot = hash & hashinfo->ehash_mask; |
3ab5aee7 | 84 | struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; |
b1a7ffcb | 85 | |
3ab5aee7 ED |
86 | |
87 | rcu_read_lock(); | |
88 | begin: | |
89 | sk_nulls_for_each_rcu(sk, node, &head->chain) { | |
ce43b03e ED |
90 | if (sk->sk_hash != hash) |
91 | continue; | |
efe4208f ED |
92 | if (!INET6_MATCH(sk, net, saddr, daddr, ports, dif)) |
93 | continue; | |
05dbc7b5 ED |
94 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) |
95 | goto out; | |
96 | ||
efe4208f ED |
97 | if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif))) { |
98 | sock_gen_put(sk); | |
99 | goto begin; | |
3ab5aee7 | 100 | } |
efe4208f | 101 | goto found; |
b1a7ffcb | 102 | } |
3ab5aee7 ED |
103 | if (get_nulls_value(node) != slot) |
104 | goto begin; | |
3ab5aee7 | 105 | out: |
05dbc7b5 ED |
106 | sk = NULL; |
107 | found: | |
3ab5aee7 | 108 | rcu_read_unlock(); |
b1a7ffcb DV |
109 | return sk; |
110 | } | |
111 | EXPORT_SYMBOL(__inet6_lookup_established); | |
112 | ||
42b16b3f | 113 | static inline int compute_score(struct sock *sk, struct net *net, |
c25eb3bf ED |
114 | const unsigned short hnum, |
115 | const struct in6_addr *daddr, | |
116 | const int dif) | |
117 | { | |
118 | int score = -1; | |
119 | ||
c720c7e8 | 120 | if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum && |
c25eb3bf | 121 | sk->sk_family == PF_INET6) { |
c25eb3bf ED |
122 | |
123 | score = 1; | |
efe4208f ED |
124 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
125 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
c25eb3bf ED |
126 | return -1; |
127 | score++; | |
128 | } | |
129 | if (sk->sk_bound_dev_if) { | |
130 | if (sk->sk_bound_dev_if != dif) | |
131 | return -1; | |
132 | score++; | |
133 | } | |
134 | } | |
135 | return score; | |
136 | } | |
137 | ||
d86e0dac | 138 | struct sock *inet6_lookup_listener(struct net *net, |
5ba24953 TH |
139 | struct inet_hashinfo *hashinfo, const struct in6_addr *saddr, |
140 | const __be16 sport, const struct in6_addr *daddr, | |
d86e0dac | 141 | const unsigned short hnum, const int dif) |
5324a040 ACM |
142 | { |
143 | struct sock *sk; | |
c25eb3bf ED |
144 | const struct hlist_nulls_node *node; |
145 | struct sock *result; | |
5ba24953 TH |
146 | int score, hiscore, matches = 0, reuseport = 0; |
147 | u32 phash = 0; | |
c25eb3bf ED |
148 | unsigned int hash = inet_lhashfn(net, hnum); |
149 | struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash]; | |
150 | ||
151 | rcu_read_lock(); | |
152 | begin: | |
153 | result = NULL; | |
5ba24953 | 154 | hiscore = 0; |
c25eb3bf ED |
155 | sk_nulls_for_each(sk, node, &ilb->head) { |
156 | score = compute_score(sk, net, hnum, daddr, dif); | |
157 | if (score > hiscore) { | |
158 | hiscore = score; | |
159 | result = sk; | |
5ba24953 TH |
160 | reuseport = sk->sk_reuseport; |
161 | if (reuseport) { | |
162 | phash = inet6_ehashfn(net, daddr, hnum, | |
163 | saddr, sport); | |
164 | matches = 1; | |
165 | } | |
166 | } else if (score == hiscore && reuseport) { | |
167 | matches++; | |
168 | if (((u64)phash * matches) >> 32 == 0) | |
169 | result = sk; | |
170 | phash = next_pseudo_random32(phash); | |
5324a040 ACM |
171 | } |
172 | } | |
c25eb3bf ED |
173 | /* |
174 | * if the nulls value we got at the end of this lookup is | |
175 | * not the expected one, we must restart lookup. | |
176 | * We probably met an item that was moved to another chain. | |
177 | */ | |
178 | if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE) | |
179 | goto begin; | |
180 | if (result) { | |
181 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) | |
182 | result = NULL; | |
183 | else if (unlikely(compute_score(result, net, hnum, daddr, | |
184 | dif) < hiscore)) { | |
185 | sock_put(result); | |
186 | goto begin; | |
187 | } | |
188 | } | |
189 | rcu_read_unlock(); | |
5324a040 ACM |
190 | return result; |
191 | } | |
192 | ||
193 | EXPORT_SYMBOL_GPL(inet6_lookup_listener); | |
194 | ||
d86e0dac | 195 | struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
d2ecd9cc AV |
196 | const struct in6_addr *saddr, const __be16 sport, |
197 | const struct in6_addr *daddr, const __be16 dport, | |
5324a040 ACM |
198 | const int dif) |
199 | { | |
200 | struct sock *sk; | |
201 | ||
202 | local_bh_disable(); | |
d86e0dac | 203 | sk = __inet6_lookup(net, hashinfo, saddr, sport, daddr, ntohs(dport), dif); |
5324a040 ACM |
204 | local_bh_enable(); |
205 | ||
206 | return sk; | |
207 | } | |
208 | ||
209 | EXPORT_SYMBOL_GPL(inet6_lookup); | |
d8313f5c ACM |
210 | |
211 | static int __inet6_check_established(struct inet_timewait_death_row *death_row, | |
212 | struct sock *sk, const __u16 lport, | |
213 | struct inet_timewait_sock **twp) | |
214 | { | |
215 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
3759fa9c | 216 | struct inet_sock *inet = inet_sk(sk); |
efe4208f ED |
217 | const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr; |
218 | const struct in6_addr *saddr = &sk->sk_v6_daddr; | |
d8313f5c | 219 | const int dif = sk->sk_bound_dev_if; |
c720c7e8 | 220 | const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport); |
33de014c PE |
221 | struct net *net = sock_net(sk); |
222 | const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr, | |
c720c7e8 | 223 | inet->inet_dport); |
d8313f5c | 224 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); |
9db66bdc | 225 | spinlock_t *lock = inet_ehash_lockp(hinfo, hash); |
d8313f5c | 226 | struct sock *sk2; |
3ab5aee7 | 227 | const struct hlist_nulls_node *node; |
05dbc7b5 | 228 | struct inet_timewait_sock *tw = NULL; |
13475a30 | 229 | int twrefcnt = 0; |
d8313f5c | 230 | |
9db66bdc | 231 | spin_lock(lock); |
d8313f5c | 232 | |
05dbc7b5 | 233 | sk_nulls_for_each(sk2, node, &head->chain) { |
ce43b03e ED |
234 | if (sk2->sk_hash != hash) |
235 | continue; | |
d8313f5c | 236 | |
efe4208f ED |
237 | if (likely(INET6_MATCH(sk2, net, saddr, daddr, ports, dif))) { |
238 | if (sk2->sk_state == TCP_TIME_WAIT) { | |
05dbc7b5 ED |
239 | tw = inet_twsk(sk2); |
240 | if (twsk_unique(sk, sk2, twp)) | |
efe4208f | 241 | break; |
05dbc7b5 | 242 | } |
d8313f5c | 243 | goto not_unique; |
efe4208f | 244 | } |
d8313f5c ACM |
245 | } |
246 | ||
3759fa9c | 247 | /* Must record num and sport now. Otherwise we will see |
efe4208f ED |
248 | * in hash table socket with a funny identity. |
249 | */ | |
c720c7e8 ED |
250 | inet->inet_num = lport; |
251 | inet->inet_sport = htons(lport); | |
13475a30 | 252 | sk->sk_hash = hash; |
547b792c | 253 | WARN_ON(!sk_unhashed(sk)); |
3ab5aee7 | 254 | __sk_nulls_add_node_rcu(sk, &head->chain); |
13475a30 ED |
255 | if (tw) { |
256 | twrefcnt = inet_twsk_unhash(tw); | |
257 | NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); | |
258 | } | |
9db66bdc | 259 | spin_unlock(lock); |
13475a30 ED |
260 | if (twrefcnt) |
261 | inet_twsk_put(tw); | |
c29a0bc4 | 262 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
d8313f5c | 263 | |
13475a30 | 264 | if (twp) { |
d8313f5c | 265 | *twp = tw; |
13475a30 | 266 | } else if (tw) { |
d8313f5c ACM |
267 | /* Silly. Should hash-dance instead... */ |
268 | inet_twsk_deschedule(tw, death_row); | |
d8313f5c ACM |
269 | |
270 | inet_twsk_put(tw); | |
271 | } | |
272 | return 0; | |
273 | ||
274 | not_unique: | |
9db66bdc | 275 | spin_unlock(lock); |
d8313f5c ACM |
276 | return -EADDRNOTAVAIL; |
277 | } | |
278 | ||
279 | static inline u32 inet6_sk_port_offset(const struct sock *sk) | |
280 | { | |
281 | const struct inet_sock *inet = inet_sk(sk); | |
efe4208f ED |
282 | |
283 | return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32, | |
284 | sk->sk_v6_daddr.s6_addr32, | |
c720c7e8 | 285 | inet->inet_dport); |
d8313f5c ACM |
286 | } |
287 | ||
288 | int inet6_hash_connect(struct inet_timewait_death_row *death_row, | |
289 | struct sock *sk) | |
290 | { | |
5d8c0aa9 | 291 | return __inet_hash_connect(death_row, sk, inet6_sk_port_offset(sk), |
5ee31fc1 | 292 | __inet6_check_established, __inet6_hash); |
d8313f5c ACM |
293 | } |
294 | ||
295 | EXPORT_SYMBOL_GPL(inet6_hash_connect); |