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, | |
59 | const int dif) | |
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; | |
efe4208f ED |
76 | if (!INET6_MATCH(sk, net, saddr, daddr, ports, dif)) |
77 | continue; | |
05dbc7b5 ED |
78 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) |
79 | goto out; | |
80 | ||
efe4208f ED |
81 | if (unlikely(!INET6_MATCH(sk, net, saddr, daddr, ports, dif))) { |
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, | |
99 | const int dif) | |
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 | } | |
112 | if (sk->sk_bound_dev_if) { | |
113 | if (sk->sk_bound_dev_if != dif) | |
114 | return -1; | |
115 | score++; | |
116 | } | |
70da268b ED |
117 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
118 | score++; | |
c25eb3bf ED |
119 | } |
120 | return score; | |
121 | } | |
122 | ||
3b24d854 | 123 | /* called with rcu_read_lock() */ |
d86e0dac | 124 | struct sock *inet6_lookup_listener(struct net *net, |
a583636a CG |
125 | struct inet_hashinfo *hashinfo, |
126 | struct sk_buff *skb, int doff, | |
127 | const struct in6_addr *saddr, | |
5ba24953 | 128 | const __be16 sport, const struct in6_addr *daddr, |
d86e0dac | 129 | const unsigned short hnum, const int dif) |
5324a040 | 130 | { |
c25eb3bf ED |
131 | unsigned int hash = inet_lhashfn(net, hnum); |
132 | struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash]; | |
3b24d854 ED |
133 | int score, hiscore = 0, matches = 0, reuseport = 0; |
134 | struct sock *sk, *result = NULL; | |
135 | u32 phash = 0; | |
c25eb3bf | 136 | |
3b24d854 | 137 | sk_for_each(sk, &ilb->head) { |
c25eb3bf ED |
138 | score = compute_score(sk, net, hnum, daddr, dif); |
139 | if (score > hiscore) { | |
03c5b534 | 140 | reuseport = sk->sk_reuseport; |
5ba24953 TH |
141 | if (reuseport) { |
142 | phash = inet6_ehashfn(net, daddr, hnum, | |
143 | saddr, sport); | |
3b24d854 ED |
144 | result = reuseport_select_sock(sk, phash, |
145 | skb, doff); | |
146 | if (result) | |
147 | return result; | |
5ba24953 TH |
148 | matches = 1; |
149 | } | |
3b24d854 | 150 | result = sk; |
03c5b534 | 151 | hiscore = score; |
5ba24953 TH |
152 | } else if (score == hiscore && reuseport) { |
153 | matches++; | |
8fc54f68 | 154 | if (reciprocal_scale(phash, matches) == 0) |
5ba24953 TH |
155 | result = sk; |
156 | phash = next_pseudo_random32(phash); | |
5324a040 ACM |
157 | } |
158 | } | |
5324a040 ACM |
159 | return result; |
160 | } | |
5324a040 ACM |
161 | EXPORT_SYMBOL_GPL(inet6_lookup_listener); |
162 | ||
d86e0dac | 163 | struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
a583636a | 164 | struct sk_buff *skb, int doff, |
d2ecd9cc AV |
165 | const struct in6_addr *saddr, const __be16 sport, |
166 | const struct in6_addr *daddr, const __be16 dport, | |
5324a040 ACM |
167 | const int dif) |
168 | { | |
169 | struct sock *sk; | |
3b24d854 | 170 | bool refcounted; |
5324a040 | 171 | |
a583636a | 172 | sk = __inet6_lookup(net, hashinfo, skb, doff, saddr, sport, daddr, |
3b24d854 ED |
173 | ntohs(dport), dif, &refcounted); |
174 | if (sk && !refcounted && !atomic_inc_not_zero(&sk->sk_refcnt)) | |
175 | sk = NULL; | |
5324a040 ACM |
176 | return sk; |
177 | } | |
5324a040 | 178 | EXPORT_SYMBOL_GPL(inet6_lookup); |
d8313f5c ACM |
179 | |
180 | static int __inet6_check_established(struct inet_timewait_death_row *death_row, | |
181 | struct sock *sk, const __u16 lport, | |
182 | struct inet_timewait_sock **twp) | |
183 | { | |
184 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
3759fa9c | 185 | struct inet_sock *inet = inet_sk(sk); |
efe4208f ED |
186 | const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr; |
187 | const struct in6_addr *saddr = &sk->sk_v6_daddr; | |
d8313f5c | 188 | const int dif = sk->sk_bound_dev_if; |
c720c7e8 | 189 | const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport); |
33de014c PE |
190 | struct net *net = sock_net(sk); |
191 | const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr, | |
c720c7e8 | 192 | inet->inet_dport); |
d8313f5c | 193 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); |
9db66bdc | 194 | spinlock_t *lock = inet_ehash_lockp(hinfo, hash); |
d8313f5c | 195 | struct sock *sk2; |
3ab5aee7 | 196 | const struct hlist_nulls_node *node; |
05dbc7b5 | 197 | struct inet_timewait_sock *tw = NULL; |
d8313f5c | 198 | |
9db66bdc | 199 | spin_lock(lock); |
d8313f5c | 200 | |
05dbc7b5 | 201 | sk_nulls_for_each(sk2, node, &head->chain) { |
ce43b03e ED |
202 | if (sk2->sk_hash != hash) |
203 | continue; | |
d8313f5c | 204 | |
efe4208f ED |
205 | if (likely(INET6_MATCH(sk2, net, saddr, daddr, ports, dif))) { |
206 | if (sk2->sk_state == TCP_TIME_WAIT) { | |
05dbc7b5 ED |
207 | tw = inet_twsk(sk2); |
208 | if (twsk_unique(sk, sk2, twp)) | |
efe4208f | 209 | break; |
05dbc7b5 | 210 | } |
d8313f5c | 211 | goto not_unique; |
efe4208f | 212 | } |
d8313f5c ACM |
213 | } |
214 | ||
3759fa9c | 215 | /* Must record num and sport now. Otherwise we will see |
efe4208f ED |
216 | * in hash table socket with a funny identity. |
217 | */ | |
c720c7e8 ED |
218 | inet->inet_num = lport; |
219 | inet->inet_sport = htons(lport); | |
13475a30 | 220 | sk->sk_hash = hash; |
547b792c | 221 | WARN_ON(!sk_unhashed(sk)); |
3ab5aee7 | 222 | __sk_nulls_add_node_rcu(sk, &head->chain); |
13475a30 | 223 | if (tw) { |
fc01538f | 224 | sk_nulls_del_node_init_rcu((struct sock *)tw); |
02a1d6e7 | 225 | __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED); |
13475a30 | 226 | } |
9db66bdc | 227 | spin_unlock(lock); |
c29a0bc4 | 228 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
d8313f5c | 229 | |
13475a30 | 230 | if (twp) { |
d8313f5c | 231 | *twp = tw; |
13475a30 | 232 | } else if (tw) { |
d8313f5c | 233 | /* Silly. Should hash-dance instead... */ |
dbe7faa4 | 234 | inet_twsk_deschedule_put(tw); |
d8313f5c ACM |
235 | } |
236 | return 0; | |
237 | ||
238 | not_unique: | |
9db66bdc | 239 | spin_unlock(lock); |
d8313f5c ACM |
240 | return -EADDRNOTAVAIL; |
241 | } | |
242 | ||
e2baad9e | 243 | static u32 inet6_sk_port_offset(const struct sock *sk) |
d8313f5c ACM |
244 | { |
245 | const struct inet_sock *inet = inet_sk(sk); | |
efe4208f ED |
246 | |
247 | return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32, | |
248 | sk->sk_v6_daddr.s6_addr32, | |
c720c7e8 | 249 | inet->inet_dport); |
d8313f5c ACM |
250 | } |
251 | ||
252 | int inet6_hash_connect(struct inet_timewait_death_row *death_row, | |
253 | struct sock *sk) | |
254 | { | |
e2baad9e ED |
255 | u32 port_offset = 0; |
256 | ||
257 | if (!inet_sk(sk)->inet_num) | |
258 | port_offset = inet6_sk_port_offset(sk); | |
259 | return __inet_hash_connect(death_row, sk, port_offset, | |
b4d6444e | 260 | __inet6_check_established); |
d8313f5c | 261 | } |
d8313f5c | 262 | EXPORT_SYMBOL_GPL(inet6_hash_connect); |
496611d7 CG |
263 | |
264 | int inet6_hash(struct sock *sk) | |
265 | { | |
266 | if (sk->sk_state != TCP_CLOSE) { | |
267 | local_bh_disable(); | |
c125e80b | 268 | __inet_hash(sk, NULL, ipv6_rcv_saddr_equal); |
496611d7 CG |
269 | local_bh_enable(); |
270 | } | |
271 | ||
272 | return 0; | |
273 | } | |
274 | EXPORT_SYMBOL_GPL(inet6_hash); | |
275 | ||
276 | /* match_wildcard == true: IPV6_ADDR_ANY equals to any IPv6 addresses if IPv6 | |
277 | * only, and any IPv4 addresses if not IPv6 only | |
278 | * match_wildcard == false: addresses must be exactly the same, i.e. | |
279 | * IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY, | |
280 | * and 0.0.0.0 equals to 0.0.0.0 only | |
281 | */ | |
282 | int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, | |
283 | bool match_wildcard) | |
284 | { | |
285 | const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); | |
286 | int sk2_ipv6only = inet_v6_ipv6only(sk2); | |
287 | int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr); | |
288 | int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; | |
289 | ||
290 | /* if both are mapped, treat as IPv4 */ | |
291 | if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) { | |
292 | if (!sk2_ipv6only) { | |
293 | if (sk->sk_rcv_saddr == sk2->sk_rcv_saddr) | |
294 | return 1; | |
295 | if (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr) | |
296 | return match_wildcard; | |
297 | } | |
298 | return 0; | |
299 | } | |
300 | ||
301 | if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY) | |
302 | return 1; | |
303 | ||
304 | if (addr_type2 == IPV6_ADDR_ANY && match_wildcard && | |
305 | !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) | |
306 | return 1; | |
307 | ||
308 | if (addr_type == IPV6_ADDR_ANY && match_wildcard && | |
309 | !(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED)) | |
310 | return 1; | |
311 | ||
312 | if (sk2_rcv_saddr6 && | |
313 | ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6)) | |
314 | return 1; | |
315 | ||
316 | return 0; | |
317 | } | |
318 | EXPORT_SYMBOL_GPL(ipv6_rcv_saddr_equal); |