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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> | |
d8313f5c | 23 | #include <net/ip.h> |
5324a040 | 24 | |
b1a7ffcb DV |
25 | void __inet6_hash(struct inet_hashinfo *hashinfo, |
26 | struct sock *sk) | |
27 | { | |
28 | struct hlist_head *list; | |
29 | rwlock_t *lock; | |
30 | ||
31 | BUG_TRAP(sk_unhashed(sk)); | |
32 | ||
33 | if (sk->sk_state == TCP_LISTEN) { | |
34 | list = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; | |
35 | lock = &hashinfo->lhash_lock; | |
36 | inet_listen_wlock(hashinfo); | |
37 | } else { | |
38 | unsigned int hash; | |
39 | sk->sk_hash = hash = inet6_sk_ehashfn(sk); | |
230140cf ED |
40 | list = &inet_ehash_bucket(hashinfo, hash)->chain; |
41 | lock = inet_ehash_lockp(hashinfo, hash); | |
b1a7ffcb DV |
42 | write_lock(lock); |
43 | } | |
44 | ||
45 | __sk_add_node(sk, list); | |
65f76517 | 46 | sock_prot_inuse_add(sk->sk_prot, 1); |
b1a7ffcb DV |
47 | write_unlock(lock); |
48 | } | |
49 | EXPORT_SYMBOL(__inet6_hash); | |
50 | ||
51 | /* | |
52 | * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so | |
53 | * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM | |
54 | * | |
55 | * The sockhash lock must be held as a reader here. | |
56 | */ | |
57 | struct sock *__inet6_lookup_established(struct inet_hashinfo *hashinfo, | |
58 | const struct in6_addr *saddr, | |
d2ecd9cc | 59 | const __be16 sport, |
b1a7ffcb DV |
60 | const struct in6_addr *daddr, |
61 | const u16 hnum, | |
62 | const int dif) | |
63 | { | |
64 | struct sock *sk; | |
65 | const struct hlist_node *node; | |
4f765d84 | 66 | const __portpair ports = INET_COMBINED_PORTS(sport, hnum); |
b1a7ffcb DV |
67 | /* Optimize here for direct hit, only listening connections can |
68 | * have wildcards anyways. | |
69 | */ | |
70 | unsigned int hash = inet6_ehashfn(daddr, hnum, saddr, sport); | |
71 | struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash); | |
230140cf | 72 | rwlock_t *lock = inet_ehash_lockp(hashinfo, hash); |
b1a7ffcb DV |
73 | |
74 | prefetch(head->chain.first); | |
230140cf | 75 | read_lock(lock); |
b1a7ffcb DV |
76 | sk_for_each(sk, node, &head->chain) { |
77 | /* For IPV6 do the cheaper port and family tests first. */ | |
78 | if (INET6_MATCH(sk, hash, saddr, daddr, ports, dif)) | |
79 | goto hit; /* You sunk my battleship! */ | |
80 | } | |
81 | /* Must check for a TIME_WAIT'er before going to listener hash. */ | |
dbca9b27 | 82 | sk_for_each(sk, node, &head->twchain) { |
535174ef PE |
83 | if (INET6_TW_MATCH(sk, hash, saddr, daddr, ports, dif)) |
84 | goto hit; | |
b1a7ffcb | 85 | } |
230140cf | 86 | read_unlock(lock); |
b1a7ffcb DV |
87 | return NULL; |
88 | ||
89 | hit: | |
90 | sock_hold(sk); | |
230140cf | 91 | read_unlock(lock); |
b1a7ffcb DV |
92 | return sk; |
93 | } | |
94 | EXPORT_SYMBOL(__inet6_lookup_established); | |
95 | ||
5324a040 ACM |
96 | struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo, |
97 | const struct in6_addr *daddr, | |
98 | const unsigned short hnum, const int dif) | |
99 | { | |
100 | struct sock *sk; | |
101 | const struct hlist_node *node; | |
102 | struct sock *result = NULL; | |
103 | int score, hiscore = 0; | |
104 | ||
105 | read_lock(&hashinfo->lhash_lock); | |
106 | sk_for_each(sk, node, &hashinfo->listening_hash[inet_lhashfn(hnum)]) { | |
107 | if (inet_sk(sk)->num == hnum && sk->sk_family == PF_INET6) { | |
108 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
1ab1457c | 109 | |
5324a040 ACM |
110 | score = 1; |
111 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
112 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) | |
113 | continue; | |
114 | score++; | |
115 | } | |
116 | if (sk->sk_bound_dev_if) { | |
117 | if (sk->sk_bound_dev_if != dif) | |
118 | continue; | |
119 | score++; | |
120 | } | |
121 | if (score == 3) { | |
122 | result = sk; | |
123 | break; | |
124 | } | |
125 | if (score > hiscore) { | |
126 | hiscore = score; | |
127 | result = sk; | |
128 | } | |
129 | } | |
130 | } | |
131 | if (result) | |
132 | sock_hold(result); | |
133 | read_unlock(&hashinfo->lhash_lock); | |
134 | return result; | |
135 | } | |
136 | ||
137 | EXPORT_SYMBOL_GPL(inet6_lookup_listener); | |
138 | ||
139 | struct sock *inet6_lookup(struct inet_hashinfo *hashinfo, | |
d2ecd9cc AV |
140 | const struct in6_addr *saddr, const __be16 sport, |
141 | const struct in6_addr *daddr, const __be16 dport, | |
5324a040 ACM |
142 | const int dif) |
143 | { | |
144 | struct sock *sk; | |
145 | ||
146 | local_bh_disable(); | |
147 | sk = __inet6_lookup(hashinfo, saddr, sport, daddr, ntohs(dport), dif); | |
148 | local_bh_enable(); | |
149 | ||
150 | return sk; | |
151 | } | |
152 | ||
153 | EXPORT_SYMBOL_GPL(inet6_lookup); | |
d8313f5c ACM |
154 | |
155 | static int __inet6_check_established(struct inet_timewait_death_row *death_row, | |
156 | struct sock *sk, const __u16 lport, | |
157 | struct inet_timewait_sock **twp) | |
158 | { | |
159 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
3759fa9c | 160 | struct inet_sock *inet = inet_sk(sk); |
d8313f5c ACM |
161 | const struct ipv6_pinfo *np = inet6_sk(sk); |
162 | const struct in6_addr *daddr = &np->rcv_saddr; | |
163 | const struct in6_addr *saddr = &np->daddr; | |
164 | const int dif = sk->sk_bound_dev_if; | |
4f765d84 | 165 | const __portpair ports = INET_COMBINED_PORTS(inet->dport, lport); |
6e1d9d04 | 166 | const unsigned int hash = inet6_ehashfn(daddr, lport, saddr, |
d8313f5c ACM |
167 | inet->dport); |
168 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); | |
230140cf | 169 | rwlock_t *lock = inet_ehash_lockp(hinfo, hash); |
d8313f5c ACM |
170 | struct sock *sk2; |
171 | const struct hlist_node *node; | |
172 | struct inet_timewait_sock *tw; | |
173 | ||
174 | prefetch(head->chain.first); | |
230140cf | 175 | write_lock(lock); |
d8313f5c ACM |
176 | |
177 | /* Check TIME-WAIT sockets first. */ | |
dbca9b27 | 178 | sk_for_each(sk2, node, &head->twchain) { |
d8313f5c ACM |
179 | tw = inet_twsk(sk2); |
180 | ||
535174ef | 181 | if (INET6_TW_MATCH(sk2, hash, saddr, daddr, ports, dif)) { |
d8313f5c ACM |
182 | if (twsk_unique(sk, sk2, twp)) |
183 | goto unique; | |
184 | else | |
185 | goto not_unique; | |
186 | } | |
187 | } | |
188 | tw = NULL; | |
189 | ||
190 | /* And established part... */ | |
191 | sk_for_each(sk2, node, &head->chain) { | |
192 | if (INET6_MATCH(sk2, hash, saddr, daddr, ports, dif)) | |
193 | goto not_unique; | |
194 | } | |
195 | ||
196 | unique: | |
3759fa9c HX |
197 | /* Must record num and sport now. Otherwise we will see |
198 | * in hash table socket with a funny identity. */ | |
199 | inet->num = lport; | |
200 | inet->sport = htons(lport); | |
d8313f5c ACM |
201 | BUG_TRAP(sk_unhashed(sk)); |
202 | __sk_add_node(sk, &head->chain); | |
203 | sk->sk_hash = hash; | |
65f76517 | 204 | sock_prot_inuse_add(sk->sk_prot, 1); |
230140cf | 205 | write_unlock(lock); |
d8313f5c ACM |
206 | |
207 | if (twp != NULL) { | |
208 | *twp = tw; | |
209 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
210 | } else if (tw != NULL) { | |
211 | /* Silly. Should hash-dance instead... */ | |
212 | inet_twsk_deschedule(tw, death_row); | |
213 | NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED); | |
214 | ||
215 | inet_twsk_put(tw); | |
216 | } | |
217 | return 0; | |
218 | ||
219 | not_unique: | |
230140cf | 220 | write_unlock(lock); |
d8313f5c ACM |
221 | return -EADDRNOTAVAIL; |
222 | } | |
223 | ||
224 | static inline u32 inet6_sk_port_offset(const struct sock *sk) | |
225 | { | |
226 | const struct inet_sock *inet = inet_sk(sk); | |
227 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
228 | return secure_ipv6_port_ephemeral(np->rcv_saddr.s6_addr32, | |
229 | np->daddr.s6_addr32, | |
230 | inet->dport); | |
231 | } | |
232 | ||
233 | int inet6_hash_connect(struct inet_timewait_death_row *death_row, | |
234 | struct sock *sk) | |
235 | { | |
5ee31fc1 PE |
236 | return __inet_hash_connect(death_row, sk, |
237 | __inet6_check_established, __inet6_hash); | |
d8313f5c ACM |
238 | } |
239 | ||
240 | EXPORT_SYMBOL_GPL(inet6_hash_connect); |