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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 | * |
8 | * Authors: Lotsa people, from code originally in tcp, generalised here |
9 | * by Arnaldo Carvalho de Melo <acme@mandriva.com> |
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 | |
17 | #include <linux/module.h> |
18 | #include <linux/random.h> |
19 | |
20 | #include <net/inet_connection_sock.h> |
21 | #include <net/inet_hashtables.h> |
22 | #include <net/inet6_hashtables.h> |
23 | #include <net/ip.h> |
24 | |
25 | int __inet6_hash(struct sock *sk, struct inet_timewait_sock *tw) |
26 | { |
27 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
28 | int twrefcnt = 0; |
29 | |
30 | WARN_ON(!sk_unhashed(sk)); |
31 | |
32 | if (sk->sk_state == TCP_LISTEN) { |
33 | struct inet_listen_hashbucket *ilb; |
34 | |
35 | ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; |
36 | spin_lock(&ilb->lock); |
37 | __sk_nulls_add_node_rcu(sk, &ilb->head); |
38 | spin_unlock(&ilb->lock); |
39 | } else { |
40 | unsigned int hash; |
41 | struct hlist_nulls_head *list; |
42 | spinlock_t *lock; |
43 | |
44 | sk->sk_hash = hash = inet6_sk_ehashfn(sk); |
45 | list = &inet_ehash_bucket(hashinfo, hash)->chain; |
46 | lock = inet_ehash_lockp(hashinfo, hash); |
47 | spin_lock(lock); |
48 | __sk_nulls_add_node_rcu(sk, list); |
49 | if (tw) { |
50 | WARN_ON(sk->sk_hash != tw->tw_hash); |
51 | twrefcnt = inet_twsk_unhash(tw); |
52 | } |
53 | spin_unlock(lock); |
54 | } |
55 | |
56 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
57 | return twrefcnt; |
58 | } |
59 | EXPORT_SYMBOL(__inet6_hash); |
60 | |
61 | /* |
62 | * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so |
63 | * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM |
64 | * |
65 | * The sockhash lock must be held as a reader here. |
66 | */ |
67 | struct sock *__inet6_lookup_established(struct net *net, |
68 | struct inet_hashinfo *hashinfo, |
69 | const struct in6_addr *saddr, |
70 | const __be16 sport, |
71 | const struct in6_addr *daddr, |
72 | const u16 hnum, |
73 | const int dif) |
74 | { |
75 | struct sock *sk; |
76 | const struct hlist_nulls_node *node; |
77 | const __portpair ports = INET_COMBINED_PORTS(sport, hnum); |
78 | /* Optimize here for direct hit, only listening connections can |
79 | * have wildcards anyways. |
80 | */ |
81 | unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport); |
82 | unsigned int slot = hash & hashinfo->ehash_mask; |
83 | struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; |
84 | |
85 | |
86 | rcu_read_lock(); |
87 | begin: |
88 | sk_nulls_for_each_rcu(sk, node, &head->chain) { |
89 | /* For IPV6 do the cheaper port and family tests first. */ |
90 | if (INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { |
91 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) |
92 | goto begintw; |
93 | if (!INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { |
94 | sock_put(sk); |
95 | goto begin; |
96 | } |
97 | goto out; |
98 | } |
99 | } |
100 | if (get_nulls_value(node) != slot) |
101 | goto begin; |
102 | |
103 | begintw: |
104 | /* Must check for a TIME_WAIT'er before going to listener hash. */ |
105 | sk_nulls_for_each_rcu(sk, node, &head->twchain) { |
106 | if (INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { |
107 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) { |
108 | sk = NULL; |
109 | goto out; |
110 | } |
111 | if (!INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { |
112 | sock_put(sk); |
113 | goto begintw; |
114 | } |
115 | goto out; |
116 | } |
117 | } |
118 | if (get_nulls_value(node) != slot) |
119 | goto begintw; |
120 | sk = NULL; |
121 | out: |
122 | rcu_read_unlock(); |
123 | return sk; |
124 | } |
125 | EXPORT_SYMBOL(__inet6_lookup_established); |
126 | |
127 | static int inline compute_score(struct sock *sk, struct net *net, |
128 | const unsigned short hnum, |
129 | const struct in6_addr *daddr, |
130 | const int dif) |
131 | { |
132 | int score = -1; |
133 | |
134 | if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum && |
135 | sk->sk_family == PF_INET6) { |
136 | const struct ipv6_pinfo *np = inet6_sk(sk); |
137 | |
138 | score = 1; |
139 | if (!ipv6_addr_any(&np->rcv_saddr)) { |
140 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) |
141 | return -1; |
142 | score++; |
143 | } |
144 | if (sk->sk_bound_dev_if) { |
145 | if (sk->sk_bound_dev_if != dif) |
146 | return -1; |
147 | score++; |
148 | } |
149 | } |
150 | return score; |
151 | } |
152 | |
153 | struct sock *inet6_lookup_listener(struct net *net, |
154 | struct inet_hashinfo *hashinfo, const struct in6_addr *daddr, |
155 | const unsigned short hnum, const int dif) |
156 | { |
157 | struct sock *sk; |
158 | const struct hlist_nulls_node *node; |
159 | struct sock *result; |
160 | int score, hiscore; |
161 | unsigned int hash = inet_lhashfn(net, hnum); |
162 | struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash]; |
163 | |
164 | rcu_read_lock(); |
165 | begin: |
166 | result = NULL; |
167 | hiscore = -1; |
168 | sk_nulls_for_each(sk, node, &ilb->head) { |
169 | score = compute_score(sk, net, hnum, daddr, dif); |
170 | if (score > hiscore) { |
171 | hiscore = score; |
172 | result = sk; |
173 | } |
174 | } |
175 | /* |
176 | * if the nulls value we got at the end of this lookup is |
177 | * not the expected one, we must restart lookup. |
178 | * We probably met an item that was moved to another chain. |
179 | */ |
180 | if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE) |
181 | goto begin; |
182 | if (result) { |
183 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) |
184 | result = NULL; |
185 | else if (unlikely(compute_score(result, net, hnum, daddr, |
186 | dif) < hiscore)) { |
187 | sock_put(result); |
188 | goto begin; |
189 | } |
190 | } |
191 | rcu_read_unlock(); |
192 | return result; |
193 | } |
194 | |
195 | EXPORT_SYMBOL_GPL(inet6_lookup_listener); |
196 | |
197 | struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
198 | const struct in6_addr *saddr, const __be16 sport, |
199 | const struct in6_addr *daddr, const __be16 dport, |
200 | const int dif) |
201 | { |
202 | struct sock *sk; |
203 | |
204 | local_bh_disable(); |
205 | sk = __inet6_lookup(net, hashinfo, saddr, sport, daddr, ntohs(dport), dif); |
206 | local_bh_enable(); |
207 | |
208 | return sk; |
209 | } |
210 | |
211 | EXPORT_SYMBOL_GPL(inet6_lookup); |
212 | |
213 | static int __inet6_check_established(struct inet_timewait_death_row *death_row, |
214 | struct sock *sk, const __u16 lport, |
215 | struct inet_timewait_sock **twp) |
216 | { |
217 | struct inet_hashinfo *hinfo = death_row->hashinfo; |
218 | struct inet_sock *inet = inet_sk(sk); |
219 | const struct ipv6_pinfo *np = inet6_sk(sk); |
220 | const struct in6_addr *daddr = &np->rcv_saddr; |
221 | const struct in6_addr *saddr = &np->daddr; |
222 | const int dif = sk->sk_bound_dev_if; |
223 | const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport); |
224 | struct net *net = sock_net(sk); |
225 | const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr, |
226 | inet->inet_dport); |
227 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); |
228 | spinlock_t *lock = inet_ehash_lockp(hinfo, hash); |
229 | struct sock *sk2; |
230 | const struct hlist_nulls_node *node; |
231 | struct inet_timewait_sock *tw; |
232 | int twrefcnt = 0; |
233 | |
234 | spin_lock(lock); |
235 | |
236 | /* Check TIME-WAIT sockets first. */ |
237 | sk_nulls_for_each(sk2, node, &head->twchain) { |
238 | tw = inet_twsk(sk2); |
239 | |
240 | if (INET6_TW_MATCH(sk2, net, hash, saddr, daddr, ports, dif)) { |
241 | if (twsk_unique(sk, sk2, twp)) |
242 | goto unique; |
243 | else |
244 | goto not_unique; |
245 | } |
246 | } |
247 | tw = NULL; |
248 | |
249 | /* And established part... */ |
250 | sk_nulls_for_each(sk2, node, &head->chain) { |
251 | if (INET6_MATCH(sk2, net, hash, saddr, daddr, ports, dif)) |
252 | goto not_unique; |
253 | } |
254 | |
255 | unique: |
256 | /* Must record num and sport now. Otherwise we will see |
257 | * in hash table socket with a funny identity. */ |
258 | inet->inet_num = lport; |
259 | inet->inet_sport = htons(lport); |
260 | sk->sk_hash = hash; |
261 | WARN_ON(!sk_unhashed(sk)); |
262 | __sk_nulls_add_node_rcu(sk, &head->chain); |
263 | if (tw) { |
264 | twrefcnt = inet_twsk_unhash(tw); |
265 | NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); |
266 | } |
267 | spin_unlock(lock); |
268 | if (twrefcnt) |
269 | inet_twsk_put(tw); |
270 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
271 | |
272 | if (twp) { |
273 | *twp = tw; |
274 | } else if (tw) { |
275 | /* Silly. Should hash-dance instead... */ |
276 | inet_twsk_deschedule(tw, death_row); |
277 | |
278 | inet_twsk_put(tw); |
279 | } |
280 | return 0; |
281 | |
282 | not_unique: |
283 | spin_unlock(lock); |
284 | return -EADDRNOTAVAIL; |
285 | } |
286 | |
287 | static inline u32 inet6_sk_port_offset(const struct sock *sk) |
288 | { |
289 | const struct inet_sock *inet = inet_sk(sk); |
290 | const struct ipv6_pinfo *np = inet6_sk(sk); |
291 | return secure_ipv6_port_ephemeral(np->rcv_saddr.s6_addr32, |
292 | np->daddr.s6_addr32, |
293 | inet->inet_dport); |
294 | } |
295 | |
296 | int inet6_hash_connect(struct inet_timewait_death_row *death_row, |
297 | struct sock *sk) |
298 | { |
299 | return __inet_hash_connect(death_row, sk, inet6_sk_port_offset(sk), |
300 | __inet6_check_established, __inet6_hash); |
301 | } |
302 | |
303 | EXPORT_SYMBOL_GPL(inet6_hash_connect); |
304 |
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