Commit | Line | Data |
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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 | |
b50026b5 HFS |
26 | static unsigned int inet6_ehashfn(struct net *net, |
27 | const struct in6_addr *laddr, | |
28 | const u16 lport, | |
29 | const struct in6_addr *faddr, | |
30 | const __be16 fport) | |
31 | { | |
1bbdceef HFS |
32 | static u32 inet6_ehash_secret __read_mostly; |
33 | static u32 ipv6_hash_secret __read_mostly; | |
34 | ||
35 | u32 lhash, fhash; | |
36 | ||
37 | net_get_random_once(&inet6_ehash_secret, sizeof(inet6_ehash_secret)); | |
38 | net_get_random_once(&ipv6_hash_secret, sizeof(ipv6_hash_secret)); | |
39 | ||
40 | lhash = (__force u32)laddr->s6_addr32[3]; | |
41 | fhash = __ipv6_addr_jhash(faddr, ipv6_hash_secret); | |
42 | ||
b50026b5 | 43 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
1bbdceef | 44 | inet6_ehash_secret + net_hash_mix(net)); |
b50026b5 HFS |
45 | } |
46 | ||
47 | static int inet6_sk_ehashfn(const struct sock *sk) | |
48 | { | |
49 | const struct inet_sock *inet = inet_sk(sk); | |
50 | const struct in6_addr *laddr = &sk->sk_v6_rcv_saddr; | |
51 | const struct in6_addr *faddr = &sk->sk_v6_daddr; | |
52 | const __u16 lport = inet->inet_num; | |
53 | const __be16 fport = inet->inet_dport; | |
54 | struct net *net = sock_net(sk); | |
55 | ||
56 | return inet6_ehashfn(net, laddr, lport, faddr, fport); | |
57 | } | |
58 | ||
9327f705 | 59 | int __inet6_hash(struct sock *sk, struct inet_timewait_sock *tw) |
b1a7ffcb | 60 | { |
39d8cda7 | 61 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
9327f705 | 62 | int twrefcnt = 0; |
b1a7ffcb | 63 | |
547b792c | 64 | WARN_ON(!sk_unhashed(sk)); |
b1a7ffcb DV |
65 | |
66 | if (sk->sk_state == TCP_LISTEN) { | |
5caea4ea | 67 | struct inet_listen_hashbucket *ilb; |
3ab5aee7 | 68 | |
5caea4ea ED |
69 | ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; |
70 | spin_lock(&ilb->lock); | |
c25eb3bf | 71 | __sk_nulls_add_node_rcu(sk, &ilb->head); |
5caea4ea | 72 | spin_unlock(&ilb->lock); |
b1a7ffcb DV |
73 | } else { |
74 | unsigned int hash; | |
3ab5aee7 | 75 | struct hlist_nulls_head *list; |
9db66bdc | 76 | spinlock_t *lock; |
3ab5aee7 | 77 | |
b1a7ffcb | 78 | sk->sk_hash = hash = inet6_sk_ehashfn(sk); |
230140cf ED |
79 | list = &inet_ehash_bucket(hashinfo, hash)->chain; |
80 | lock = inet_ehash_lockp(hashinfo, hash); | |
9db66bdc | 81 | spin_lock(lock); |
3ab5aee7 | 82 | __sk_nulls_add_node_rcu(sk, list); |
9327f705 ED |
83 | if (tw) { |
84 | WARN_ON(sk->sk_hash != tw->tw_hash); | |
85 | twrefcnt = inet_twsk_unhash(tw); | |
86 | } | |
9db66bdc | 87 | spin_unlock(lock); |
b1a7ffcb DV |
88 | } |
89 | ||
c29a0bc4 | 90 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
9327f705 | 91 | return twrefcnt; |
b1a7ffcb DV |
92 | } |
93 | EXPORT_SYMBOL(__inet6_hash); | |
94 | ||
95 | /* | |
96 | * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so | |
97 | * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM | |
98 | * | |
99 | * The sockhash lock must be held as a reader here. | |
100 | */ | |
d86e0dac PE |
101 | struct sock *__inet6_lookup_established(struct net *net, |
102 | struct inet_hashinfo *hashinfo, | |
b1a7ffcb | 103 | const struct in6_addr *saddr, |
d2ecd9cc | 104 | const __be16 sport, |
b1a7ffcb DV |
105 | const struct in6_addr *daddr, |
106 | const u16 hnum, | |
107 | const int dif) | |
108 | { | |
109 | struct sock *sk; | |
3ab5aee7 | 110 | const struct hlist_nulls_node *node; |
4f765d84 | 111 | const __portpair ports = INET_COMBINED_PORTS(sport, hnum); |
b1a7ffcb DV |
112 | /* Optimize here for direct hit, only listening connections can |
113 | * have wildcards anyways. | |
114 | */ | |
33de014c | 115 | unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport); |
f373b53b | 116 | unsigned int slot = hash & hashinfo->ehash_mask; |
3ab5aee7 | 117 | struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; |
b1a7ffcb | 118 | |
3ab5aee7 ED |
119 | |
120 | rcu_read_lock(); | |
121 | begin: | |
122 | sk_nulls_for_each_rcu(sk, node, &head->chain) { | |
ce43b03e ED |
123 | if (sk->sk_hash != hash) |
124 | continue; | |
efe4208f ED |
125 | if (!INET6_MATCH(sk, net, saddr, daddr, ports, dif)) |
126 | continue; | |
05dbc7b5 ED |
127 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) |
128 | goto out; | |
129 | ||
efe4208f ED |
130 | if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif))) { |
131 | sock_gen_put(sk); | |
132 | goto begin; | |
3ab5aee7 | 133 | } |
efe4208f | 134 | goto found; |
b1a7ffcb | 135 | } |
3ab5aee7 ED |
136 | if (get_nulls_value(node) != slot) |
137 | goto begin; | |
3ab5aee7 | 138 | out: |
05dbc7b5 ED |
139 | sk = NULL; |
140 | found: | |
3ab5aee7 | 141 | rcu_read_unlock(); |
b1a7ffcb DV |
142 | return sk; |
143 | } | |
144 | EXPORT_SYMBOL(__inet6_lookup_established); | |
145 | ||
42b16b3f | 146 | static inline int compute_score(struct sock *sk, struct net *net, |
c25eb3bf ED |
147 | const unsigned short hnum, |
148 | const struct in6_addr *daddr, | |
149 | const int dif) | |
150 | { | |
151 | int score = -1; | |
152 | ||
c720c7e8 | 153 | if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum && |
c25eb3bf | 154 | sk->sk_family == PF_INET6) { |
c25eb3bf ED |
155 | |
156 | score = 1; | |
efe4208f ED |
157 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
158 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
c25eb3bf ED |
159 | return -1; |
160 | score++; | |
161 | } | |
162 | if (sk->sk_bound_dev_if) { | |
163 | if (sk->sk_bound_dev_if != dif) | |
164 | return -1; | |
165 | score++; | |
166 | } | |
167 | } | |
168 | return score; | |
169 | } | |
170 | ||
d86e0dac | 171 | struct sock *inet6_lookup_listener(struct net *net, |
5ba24953 TH |
172 | struct inet_hashinfo *hashinfo, const struct in6_addr *saddr, |
173 | const __be16 sport, const struct in6_addr *daddr, | |
d86e0dac | 174 | const unsigned short hnum, const int dif) |
5324a040 ACM |
175 | { |
176 | struct sock *sk; | |
c25eb3bf ED |
177 | const struct hlist_nulls_node *node; |
178 | struct sock *result; | |
5ba24953 TH |
179 | int score, hiscore, matches = 0, reuseport = 0; |
180 | u32 phash = 0; | |
c25eb3bf ED |
181 | unsigned int hash = inet_lhashfn(net, hnum); |
182 | struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash]; | |
183 | ||
184 | rcu_read_lock(); | |
185 | begin: | |
186 | result = NULL; | |
5ba24953 | 187 | hiscore = 0; |
c25eb3bf ED |
188 | sk_nulls_for_each(sk, node, &ilb->head) { |
189 | score = compute_score(sk, net, hnum, daddr, dif); | |
190 | if (score > hiscore) { | |
191 | hiscore = score; | |
192 | result = sk; | |
5ba24953 TH |
193 | reuseport = sk->sk_reuseport; |
194 | if (reuseport) { | |
195 | phash = inet6_ehashfn(net, daddr, hnum, | |
196 | saddr, sport); | |
197 | matches = 1; | |
198 | } | |
199 | } else if (score == hiscore && reuseport) { | |
200 | matches++; | |
201 | if (((u64)phash * matches) >> 32 == 0) | |
202 | result = sk; | |
203 | phash = next_pseudo_random32(phash); | |
5324a040 ACM |
204 | } |
205 | } | |
c25eb3bf ED |
206 | /* |
207 | * if the nulls value we got at the end of this lookup is | |
208 | * not the expected one, we must restart lookup. | |
209 | * We probably met an item that was moved to another chain. | |
210 | */ | |
211 | if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE) | |
212 | goto begin; | |
213 | if (result) { | |
214 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) | |
215 | result = NULL; | |
216 | else if (unlikely(compute_score(result, net, hnum, daddr, | |
217 | dif) < hiscore)) { | |
218 | sock_put(result); | |
219 | goto begin; | |
220 | } | |
221 | } | |
222 | rcu_read_unlock(); | |
5324a040 ACM |
223 | return result; |
224 | } | |
225 | ||
226 | EXPORT_SYMBOL_GPL(inet6_lookup_listener); | |
227 | ||
d86e0dac | 228 | struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
d2ecd9cc AV |
229 | const struct in6_addr *saddr, const __be16 sport, |
230 | const struct in6_addr *daddr, const __be16 dport, | |
5324a040 ACM |
231 | const int dif) |
232 | { | |
233 | struct sock *sk; | |
234 | ||
235 | local_bh_disable(); | |
d86e0dac | 236 | sk = __inet6_lookup(net, hashinfo, saddr, sport, daddr, ntohs(dport), dif); |
5324a040 ACM |
237 | local_bh_enable(); |
238 | ||
239 | return sk; | |
240 | } | |
241 | ||
242 | EXPORT_SYMBOL_GPL(inet6_lookup); | |
d8313f5c ACM |
243 | |
244 | static int __inet6_check_established(struct inet_timewait_death_row *death_row, | |
245 | struct sock *sk, const __u16 lport, | |
246 | struct inet_timewait_sock **twp) | |
247 | { | |
248 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
3759fa9c | 249 | struct inet_sock *inet = inet_sk(sk); |
efe4208f ED |
250 | const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr; |
251 | const struct in6_addr *saddr = &sk->sk_v6_daddr; | |
d8313f5c | 252 | const int dif = sk->sk_bound_dev_if; |
c720c7e8 | 253 | const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport); |
33de014c PE |
254 | struct net *net = sock_net(sk); |
255 | const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr, | |
c720c7e8 | 256 | inet->inet_dport); |
d8313f5c | 257 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); |
9db66bdc | 258 | spinlock_t *lock = inet_ehash_lockp(hinfo, hash); |
d8313f5c | 259 | struct sock *sk2; |
3ab5aee7 | 260 | const struct hlist_nulls_node *node; |
05dbc7b5 | 261 | struct inet_timewait_sock *tw = NULL; |
13475a30 | 262 | int twrefcnt = 0; |
d8313f5c | 263 | |
9db66bdc | 264 | spin_lock(lock); |
d8313f5c | 265 | |
05dbc7b5 | 266 | sk_nulls_for_each(sk2, node, &head->chain) { |
ce43b03e ED |
267 | if (sk2->sk_hash != hash) |
268 | continue; | |
d8313f5c | 269 | |
efe4208f ED |
270 | if (likely(INET6_MATCH(sk2, net, saddr, daddr, ports, dif))) { |
271 | if (sk2->sk_state == TCP_TIME_WAIT) { | |
05dbc7b5 ED |
272 | tw = inet_twsk(sk2); |
273 | if (twsk_unique(sk, sk2, twp)) | |
efe4208f | 274 | break; |
05dbc7b5 | 275 | } |
d8313f5c | 276 | goto not_unique; |
efe4208f | 277 | } |
d8313f5c ACM |
278 | } |
279 | ||
3759fa9c | 280 | /* Must record num and sport now. Otherwise we will see |
efe4208f ED |
281 | * in hash table socket with a funny identity. |
282 | */ | |
c720c7e8 ED |
283 | inet->inet_num = lport; |
284 | inet->inet_sport = htons(lport); | |
13475a30 | 285 | sk->sk_hash = hash; |
547b792c | 286 | WARN_ON(!sk_unhashed(sk)); |
3ab5aee7 | 287 | __sk_nulls_add_node_rcu(sk, &head->chain); |
13475a30 ED |
288 | if (tw) { |
289 | twrefcnt = inet_twsk_unhash(tw); | |
290 | NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); | |
291 | } | |
9db66bdc | 292 | spin_unlock(lock); |
13475a30 ED |
293 | if (twrefcnt) |
294 | inet_twsk_put(tw); | |
c29a0bc4 | 295 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
d8313f5c | 296 | |
13475a30 | 297 | if (twp) { |
d8313f5c | 298 | *twp = tw; |
13475a30 | 299 | } else if (tw) { |
d8313f5c ACM |
300 | /* Silly. Should hash-dance instead... */ |
301 | inet_twsk_deschedule(tw, death_row); | |
d8313f5c ACM |
302 | |
303 | inet_twsk_put(tw); | |
304 | } | |
305 | return 0; | |
306 | ||
307 | not_unique: | |
9db66bdc | 308 | spin_unlock(lock); |
d8313f5c ACM |
309 | return -EADDRNOTAVAIL; |
310 | } | |
311 | ||
312 | static inline u32 inet6_sk_port_offset(const struct sock *sk) | |
313 | { | |
314 | const struct inet_sock *inet = inet_sk(sk); | |
efe4208f ED |
315 | |
316 | return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32, | |
317 | sk->sk_v6_daddr.s6_addr32, | |
c720c7e8 | 318 | inet->inet_dport); |
d8313f5c ACM |
319 | } |
320 | ||
321 | int inet6_hash_connect(struct inet_timewait_death_row *death_row, | |
322 | struct sock *sk) | |
323 | { | |
5d8c0aa9 | 324 | return __inet_hash_connect(death_row, sk, inet6_sk_port_offset(sk), |
5ee31fc1 | 325 | __inet6_check_established, __inet6_hash); |
d8313f5c ACM |
326 | } |
327 | ||
328 | EXPORT_SYMBOL_GPL(inet6_hash_connect); |