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 | 8 | * Authors: Lotsa people, from code originally in tcp, generalised here |
67ba4152 | 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 | 19 | |
c125e80b | 20 | #include <net/addrconf.h> |
5324a040 ACM |
21 | #include <net/inet_connection_sock.h> |
22 | #include <net/inet_hashtables.h> | |
23 | #include <net/inet6_hashtables.h> | |
6e5714ea | 24 | #include <net/secure_seq.h> |
d8313f5c | 25 | #include <net/ip.h> |
c125e80b | 26 | #include <net/sock_reuseport.h> |
5324a040 | 27 | |
d1e559d0 ED |
28 | u32 inet6_ehashfn(const struct net *net, |
29 | const struct in6_addr *laddr, const u16 lport, | |
30 | const struct in6_addr *faddr, const __be16 fport) | |
b50026b5 | 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 | ||
b1a7ffcb DV |
47 | /* |
48 | * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so | |
49 | * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM | |
50 | * | |
51 | * The sockhash lock must be held as a reader here. | |
52 | */ | |
d86e0dac PE |
53 | struct sock *__inet6_lookup_established(struct net *net, |
54 | struct inet_hashinfo *hashinfo, | |
b1a7ffcb | 55 | const struct in6_addr *saddr, |
d2ecd9cc | 56 | const __be16 sport, |
b1a7ffcb DV |
57 | const struct in6_addr *daddr, |
58 | const u16 hnum, | |
4297a0ef | 59 | const int dif, const int sdif) |
b1a7ffcb DV |
60 | { |
61 | struct sock *sk; | |
3ab5aee7 | 62 | const struct hlist_nulls_node *node; |
4f765d84 | 63 | const __portpair ports = INET_COMBINED_PORTS(sport, hnum); |
b1a7ffcb DV |
64 | /* Optimize here for direct hit, only listening connections can |
65 | * have wildcards anyways. | |
66 | */ | |
33de014c | 67 | unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport); |
f373b53b | 68 | unsigned int slot = hash & hashinfo->ehash_mask; |
3ab5aee7 | 69 | struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; |
b1a7ffcb | 70 | |
3ab5aee7 | 71 | |
3ab5aee7 ED |
72 | begin: |
73 | sk_nulls_for_each_rcu(sk, node, &head->chain) { | |
ce43b03e ED |
74 | if (sk->sk_hash != hash) |
75 | continue; | |
4297a0ef | 76 | if (!INET6_MATCH(sk, net, saddr, daddr, ports, dif, sdif)) |
efe4208f | 77 | continue; |
41c6d650 | 78 | if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt))) |
05dbc7b5 ED |
79 | goto out; |
80 | ||
4297a0ef | 81 | if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif, sdif))) { |
efe4208f ED |
82 | sock_gen_put(sk); |
83 | goto begin; | |
3ab5aee7 | 84 | } |
efe4208f | 85 | goto found; |
b1a7ffcb | 86 | } |
3ab5aee7 ED |
87 | if (get_nulls_value(node) != slot) |
88 | goto begin; | |
3ab5aee7 | 89 | out: |
05dbc7b5 ED |
90 | sk = NULL; |
91 | found: | |
b1a7ffcb DV |
92 | return sk; |
93 | } | |
94 | EXPORT_SYMBOL(__inet6_lookup_established); | |
95 | ||
42b16b3f | 96 | static inline int compute_score(struct sock *sk, struct net *net, |
c25eb3bf ED |
97 | const unsigned short hnum, |
98 | const struct in6_addr *daddr, | |
4297a0ef | 99 | const int dif, const int sdif, bool exact_dif) |
c25eb3bf ED |
100 | { |
101 | int score = -1; | |
102 | ||
c720c7e8 | 103 | if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum && |
c25eb3bf | 104 | sk->sk_family == PF_INET6) { |
c25eb3bf ED |
105 | |
106 | score = 1; | |
efe4208f ED |
107 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
108 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
c25eb3bf ED |
109 | return -1; |
110 | score++; | |
111 | } | |
a04a480d | 112 | if (sk->sk_bound_dev_if || exact_dif) { |
4297a0ef DA |
113 | bool dev_match = (sk->sk_bound_dev_if == dif || |
114 | sk->sk_bound_dev_if == sdif); | |
115 | ||
8c43bd17 | 116 | if (!dev_match) |
c25eb3bf | 117 | return -1; |
8c43bd17 | 118 | if (sk->sk_bound_dev_if) |
4297a0ef | 119 | score++; |
c25eb3bf | 120 | } |
70da268b ED |
121 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
122 | score++; | |
c25eb3bf ED |
123 | } |
124 | return score; | |
125 | } | |
126 | ||
3b24d854 | 127 | /* called with rcu_read_lock() */ |
61b7c691 MKL |
128 | static struct sock *inet6_lhash2_lookup(struct net *net, |
129 | struct inet_listen_hashbucket *ilb2, | |
130 | struct sk_buff *skb, int doff, | |
131 | const struct in6_addr *saddr, | |
132 | const __be16 sport, const struct in6_addr *daddr, | |
133 | const unsigned short hnum, const int dif, const int sdif) | |
134 | { | |
135 | bool exact_dif = inet6_exact_dif_match(net, skb); | |
136 | struct inet_connection_sock *icsk; | |
137 | struct sock *sk, *result = NULL; | |
138 | int score, hiscore = 0; | |
139 | u32 phash = 0; | |
140 | ||
141 | inet_lhash2_for_each_icsk_rcu(icsk, &ilb2->head) { | |
142 | sk = (struct sock *)icsk; | |
143 | score = compute_score(sk, net, hnum, daddr, dif, sdif, | |
144 | exact_dif); | |
145 | if (score > hiscore) { | |
146 | if (sk->sk_reuseport) { | |
147 | phash = inet6_ehashfn(net, daddr, hnum, | |
148 | saddr, sport); | |
149 | result = reuseport_select_sock(sk, phash, | |
150 | skb, doff); | |
151 | if (result) | |
152 | return result; | |
153 | } | |
154 | result = sk; | |
155 | hiscore = score; | |
156 | } | |
157 | } | |
158 | ||
159 | return result; | |
160 | } | |
161 | ||
d86e0dac | 162 | struct sock *inet6_lookup_listener(struct net *net, |
a583636a CG |
163 | struct inet_hashinfo *hashinfo, |
164 | struct sk_buff *skb, int doff, | |
165 | const struct in6_addr *saddr, | |
5ba24953 | 166 | const __be16 sport, const struct in6_addr *daddr, |
4297a0ef | 167 | const unsigned short hnum, const int dif, const int sdif) |
5324a040 | 168 | { |
c25eb3bf ED |
169 | unsigned int hash = inet_lhashfn(net, hnum); |
170 | struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash]; | |
a04a480d | 171 | bool exact_dif = inet6_exact_dif_match(net, skb); |
61b7c691 | 172 | struct inet_listen_hashbucket *ilb2; |
3b24d854 | 173 | struct sock *sk, *result = NULL; |
e94a62f5 | 174 | int score, hiscore = 0; |
61b7c691 | 175 | unsigned int hash2; |
3b24d854 | 176 | u32 phash = 0; |
c25eb3bf | 177 | |
61b7c691 MKL |
178 | if (ilb->count <= 10 || !hashinfo->lhash2) |
179 | goto port_lookup; | |
180 | ||
181 | /* Too many sk in the ilb bucket (which is hashed by port alone). | |
182 | * Try lhash2 (which is hashed by port and addr) instead. | |
183 | */ | |
184 | ||
185 | hash2 = ipv6_portaddr_hash(net, daddr, hnum); | |
186 | ilb2 = inet_lhash2_bucket(hashinfo, hash2); | |
187 | if (ilb2->count > ilb->count) | |
188 | goto port_lookup; | |
189 | ||
190 | result = inet6_lhash2_lookup(net, ilb2, skb, doff, | |
191 | saddr, sport, daddr, hnum, | |
192 | dif, sdif); | |
193 | if (result) | |
8217ca65 | 194 | goto done; |
61b7c691 MKL |
195 | |
196 | /* Lookup lhash2 with in6addr_any */ | |
197 | ||
198 | hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); | |
199 | ilb2 = inet_lhash2_bucket(hashinfo, hash2); | |
200 | if (ilb2->count > ilb->count) | |
201 | goto port_lookup; | |
202 | ||
8217ca65 MKL |
203 | result = inet6_lhash2_lookup(net, ilb2, skb, doff, |
204 | saddr, sport, daddr, hnum, | |
205 | dif, sdif); | |
206 | goto done; | |
61b7c691 MKL |
207 | |
208 | port_lookup: | |
3b24d854 | 209 | sk_for_each(sk, &ilb->head) { |
4297a0ef | 210 | score = compute_score(sk, net, hnum, daddr, dif, sdif, exact_dif); |
c25eb3bf | 211 | if (score > hiscore) { |
e94a62f5 | 212 | if (sk->sk_reuseport) { |
5ba24953 TH |
213 | phash = inet6_ehashfn(net, daddr, hnum, |
214 | saddr, sport); | |
3b24d854 ED |
215 | result = reuseport_select_sock(sk, phash, |
216 | skb, doff); | |
217 | if (result) | |
8217ca65 | 218 | goto done; |
5ba24953 | 219 | } |
3b24d854 | 220 | result = sk; |
03c5b534 | 221 | hiscore = score; |
5324a040 ACM |
222 | } |
223 | } | |
8217ca65 MKL |
224 | done: |
225 | if (unlikely(IS_ERR(result))) | |
226 | return NULL; | |
5324a040 ACM |
227 | return result; |
228 | } | |
5324a040 ACM |
229 | EXPORT_SYMBOL_GPL(inet6_lookup_listener); |
230 | ||
d86e0dac | 231 | struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
a583636a | 232 | struct sk_buff *skb, int doff, |
d2ecd9cc AV |
233 | const struct in6_addr *saddr, const __be16 sport, |
234 | const struct in6_addr *daddr, const __be16 dport, | |
5324a040 ACM |
235 | const int dif) |
236 | { | |
237 | struct sock *sk; | |
3b24d854 | 238 | bool refcounted; |
5324a040 | 239 | |
a583636a | 240 | sk = __inet6_lookup(net, hashinfo, skb, doff, saddr, sport, daddr, |
4297a0ef | 241 | ntohs(dport), dif, 0, &refcounted); |
41c6d650 | 242 | if (sk && !refcounted && !refcount_inc_not_zero(&sk->sk_refcnt)) |
3b24d854 | 243 | sk = NULL; |
5324a040 ACM |
244 | return sk; |
245 | } | |
5324a040 | 246 | EXPORT_SYMBOL_GPL(inet6_lookup); |
d8313f5c ACM |
247 | |
248 | static int __inet6_check_established(struct inet_timewait_death_row *death_row, | |
249 | struct sock *sk, const __u16 lport, | |
250 | struct inet_timewait_sock **twp) | |
251 | { | |
252 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
3759fa9c | 253 | struct inet_sock *inet = inet_sk(sk); |
efe4208f ED |
254 | const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr; |
255 | const struct in6_addr *saddr = &sk->sk_v6_daddr; | |
d8313f5c | 256 | const int dif = sk->sk_bound_dev_if; |
33de014c | 257 | struct net *net = sock_net(sk); |
4297a0ef DA |
258 | const int sdif = l3mdev_master_ifindex_by_index(net, dif); |
259 | const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport); | |
33de014c | 260 | const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr, |
c720c7e8 | 261 | inet->inet_dport); |
d8313f5c | 262 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); |
9db66bdc | 263 | spinlock_t *lock = inet_ehash_lockp(hinfo, hash); |
d8313f5c | 264 | struct sock *sk2; |
3ab5aee7 | 265 | const struct hlist_nulls_node *node; |
05dbc7b5 | 266 | struct inet_timewait_sock *tw = NULL; |
d8313f5c | 267 | |
9db66bdc | 268 | spin_lock(lock); |
d8313f5c | 269 | |
05dbc7b5 | 270 | sk_nulls_for_each(sk2, node, &head->chain) { |
ce43b03e ED |
271 | if (sk2->sk_hash != hash) |
272 | continue; | |
d8313f5c | 273 | |
4297a0ef DA |
274 | if (likely(INET6_MATCH(sk2, net, saddr, daddr, ports, |
275 | dif, sdif))) { | |
efe4208f | 276 | if (sk2->sk_state == TCP_TIME_WAIT) { |
05dbc7b5 ED |
277 | tw = inet_twsk(sk2); |
278 | if (twsk_unique(sk, sk2, twp)) | |
efe4208f | 279 | break; |
05dbc7b5 | 280 | } |
d8313f5c | 281 | goto not_unique; |
efe4208f | 282 | } |
d8313f5c ACM |
283 | } |
284 | ||
3759fa9c | 285 | /* Must record num and sport now. Otherwise we will see |
efe4208f ED |
286 | * in hash table socket with a funny identity. |
287 | */ | |
c720c7e8 ED |
288 | inet->inet_num = lport; |
289 | inet->inet_sport = htons(lport); | |
13475a30 | 290 | sk->sk_hash = hash; |
547b792c | 291 | WARN_ON(!sk_unhashed(sk)); |
3ab5aee7 | 292 | __sk_nulls_add_node_rcu(sk, &head->chain); |
13475a30 | 293 | if (tw) { |
fc01538f | 294 | sk_nulls_del_node_init_rcu((struct sock *)tw); |
02a1d6e7 | 295 | __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED); |
13475a30 | 296 | } |
9db66bdc | 297 | spin_unlock(lock); |
c29a0bc4 | 298 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
d8313f5c | 299 | |
13475a30 | 300 | if (twp) { |
d8313f5c | 301 | *twp = tw; |
13475a30 | 302 | } else if (tw) { |
d8313f5c | 303 | /* Silly. Should hash-dance instead... */ |
dbe7faa4 | 304 | inet_twsk_deschedule_put(tw); |
d8313f5c ACM |
305 | } |
306 | return 0; | |
307 | ||
308 | not_unique: | |
9db66bdc | 309 | spin_unlock(lock); |
d8313f5c ACM |
310 | return -EADDRNOTAVAIL; |
311 | } | |
312 | ||
e2baad9e | 313 | static u32 inet6_sk_port_offset(const struct sock *sk) |
d8313f5c ACM |
314 | { |
315 | const struct inet_sock *inet = inet_sk(sk); | |
efe4208f ED |
316 | |
317 | return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32, | |
318 | sk->sk_v6_daddr.s6_addr32, | |
c720c7e8 | 319 | inet->inet_dport); |
d8313f5c ACM |
320 | } |
321 | ||
322 | int inet6_hash_connect(struct inet_timewait_death_row *death_row, | |
323 | struct sock *sk) | |
324 | { | |
e2baad9e ED |
325 | u32 port_offset = 0; |
326 | ||
327 | if (!inet_sk(sk)->inet_num) | |
328 | port_offset = inet6_sk_port_offset(sk); | |
329 | return __inet_hash_connect(death_row, sk, port_offset, | |
b4d6444e | 330 | __inet6_check_established); |
d8313f5c | 331 | } |
d8313f5c | 332 | EXPORT_SYMBOL_GPL(inet6_hash_connect); |
496611d7 CG |
333 | |
334 | int inet6_hash(struct sock *sk) | |
335 | { | |
e4cabca5 CG |
336 | int err = 0; |
337 | ||
496611d7 CG |
338 | if (sk->sk_state != TCP_CLOSE) { |
339 | local_bh_disable(); | |
fe38d2a1 | 340 | err = __inet_hash(sk, NULL); |
496611d7 CG |
341 | local_bh_enable(); |
342 | } | |
343 | ||
e4cabca5 | 344 | return err; |
496611d7 CG |
345 | } |
346 | EXPORT_SYMBOL_GPL(inet6_hash); |