Commit | Line | Data |
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77d8bf9c 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 INET transport hashtables | |
7 | * | |
8 | * Authors: Lotsa people, from code originally in tcp | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
2d8c4ce5 | 16 | #include <linux/module.h> |
a7f5e7f1 | 17 | #include <linux/random.h> |
f3f05f70 | 18 | #include <linux/sched.h> |
77d8bf9c | 19 | #include <linux/slab.h> |
f3f05f70 | 20 | #include <linux/wait.h> |
77d8bf9c | 21 | |
463c84b9 | 22 | #include <net/inet_connection_sock.h> |
77d8bf9c | 23 | #include <net/inet_hashtables.h> |
6e5714ea | 24 | #include <net/secure_seq.h> |
a7f5e7f1 | 25 | #include <net/ip.h> |
77d8bf9c | 26 | |
6eada011 ED |
27 | static u32 inet_ehashfn(const struct net *net, const __be32 laddr, |
28 | const __u16 lport, const __be32 faddr, | |
29 | const __be16 fport) | |
65cd8033 | 30 | { |
1bbdceef HFS |
31 | static u32 inet_ehash_secret __read_mostly; |
32 | ||
33 | net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret)); | |
34 | ||
65cd8033 HFS |
35 | return __inet_ehashfn(laddr, lport, faddr, fport, |
36 | inet_ehash_secret + net_hash_mix(net)); | |
37 | } | |
38 | ||
d1e559d0 ED |
39 | /* This function handles inet_sock, but also timewait and request sockets |
40 | * for IPv4/IPv6. | |
41 | */ | |
5b441f76 | 42 | u32 sk_ehashfn(const struct sock *sk) |
65cd8033 | 43 | { |
d1e559d0 ED |
44 | #if IS_ENABLED(CONFIG_IPV6) |
45 | if (sk->sk_family == AF_INET6 && | |
46 | !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
47 | return inet6_ehashfn(sock_net(sk), | |
48 | &sk->sk_v6_rcv_saddr, sk->sk_num, | |
49 | &sk->sk_v6_daddr, sk->sk_dport); | |
50 | #endif | |
5b441f76 ED |
51 | return inet_ehashfn(sock_net(sk), |
52 | sk->sk_rcv_saddr, sk->sk_num, | |
53 | sk->sk_daddr, sk->sk_dport); | |
65cd8033 HFS |
54 | } |
55 | ||
77d8bf9c ACM |
56 | /* |
57 | * Allocate and initialize a new local port bind bucket. | |
58 | * The bindhash mutex for snum's hash chain must be held here. | |
59 | */ | |
e18b890b | 60 | struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep, |
941b1d22 | 61 | struct net *net, |
77d8bf9c ACM |
62 | struct inet_bind_hashbucket *head, |
63 | const unsigned short snum) | |
64 | { | |
54e6ecb2 | 65 | struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC); |
77d8bf9c | 66 | |
00db4124 | 67 | if (tb) { |
efd7ef1c | 68 | write_pnet(&tb->ib_net, net); |
77d8bf9c ACM |
69 | tb->port = snum; |
70 | tb->fastreuse = 0; | |
da5e3630 | 71 | tb->fastreuseport = 0; |
a9d8f911 | 72 | tb->num_owners = 0; |
77d8bf9c ACM |
73 | INIT_HLIST_HEAD(&tb->owners); |
74 | hlist_add_head(&tb->node, &head->chain); | |
75 | } | |
76 | return tb; | |
77 | } | |
78 | ||
77d8bf9c ACM |
79 | /* |
80 | * Caller must hold hashbucket lock for this tb with local BH disabled | |
81 | */ | |
e18b890b | 82 | void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb) |
77d8bf9c ACM |
83 | { |
84 | if (hlist_empty(&tb->owners)) { | |
85 | __hlist_del(&tb->node); | |
86 | kmem_cache_free(cachep, tb); | |
87 | } | |
88 | } | |
2d8c4ce5 ACM |
89 | |
90 | void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb, | |
91 | const unsigned short snum) | |
92 | { | |
c720c7e8 | 93 | inet_sk(sk)->inet_num = snum; |
2d8c4ce5 | 94 | sk_add_bind_node(sk, &tb->owners); |
a9d8f911 | 95 | tb->num_owners++; |
463c84b9 | 96 | inet_csk(sk)->icsk_bind_hash = tb; |
2d8c4ce5 ACM |
97 | } |
98 | ||
2d8c4ce5 ACM |
99 | /* |
100 | * Get rid of any references to a local port held by the given sock. | |
101 | */ | |
ab1e0a13 | 102 | static void __inet_put_port(struct sock *sk) |
2d8c4ce5 | 103 | { |
39d8cda7 | 104 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
c720c7e8 | 105 | const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->inet_num, |
7f635ab7 | 106 | hashinfo->bhash_size); |
2d8c4ce5 ACM |
107 | struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash]; |
108 | struct inet_bind_bucket *tb; | |
109 | ||
110 | spin_lock(&head->lock); | |
463c84b9 | 111 | tb = inet_csk(sk)->icsk_bind_hash; |
2d8c4ce5 | 112 | __sk_del_bind_node(sk); |
a9d8f911 | 113 | tb->num_owners--; |
463c84b9 | 114 | inet_csk(sk)->icsk_bind_hash = NULL; |
c720c7e8 | 115 | inet_sk(sk)->inet_num = 0; |
2d8c4ce5 ACM |
116 | inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb); |
117 | spin_unlock(&head->lock); | |
118 | } | |
119 | ||
ab1e0a13 | 120 | void inet_put_port(struct sock *sk) |
2d8c4ce5 ACM |
121 | { |
122 | local_bh_disable(); | |
ab1e0a13 | 123 | __inet_put_port(sk); |
2d8c4ce5 ACM |
124 | local_bh_enable(); |
125 | } | |
2d8c4ce5 | 126 | EXPORT_SYMBOL(inet_put_port); |
f3f05f70 | 127 | |
093d2823 | 128 | int __inet_inherit_port(struct sock *sk, struct sock *child) |
53083773 PE |
129 | { |
130 | struct inet_hashinfo *table = sk->sk_prot->h.hashinfo; | |
093d2823 BS |
131 | unsigned short port = inet_sk(child)->inet_num; |
132 | const int bhash = inet_bhashfn(sock_net(sk), port, | |
7f635ab7 | 133 | table->bhash_size); |
53083773 PE |
134 | struct inet_bind_hashbucket *head = &table->bhash[bhash]; |
135 | struct inet_bind_bucket *tb; | |
136 | ||
137 | spin_lock(&head->lock); | |
138 | tb = inet_csk(sk)->icsk_bind_hash; | |
093d2823 BS |
139 | if (tb->port != port) { |
140 | /* NOTE: using tproxy and redirecting skbs to a proxy | |
141 | * on a different listener port breaks the assumption | |
142 | * that the listener socket's icsk_bind_hash is the same | |
143 | * as that of the child socket. We have to look up or | |
144 | * create a new bind bucket for the child here. */ | |
b67bfe0d | 145 | inet_bind_bucket_for_each(tb, &head->chain) { |
093d2823 BS |
146 | if (net_eq(ib_net(tb), sock_net(sk)) && |
147 | tb->port == port) | |
148 | break; | |
149 | } | |
b67bfe0d | 150 | if (!tb) { |
093d2823 BS |
151 | tb = inet_bind_bucket_create(table->bind_bucket_cachep, |
152 | sock_net(sk), head, port); | |
153 | if (!tb) { | |
154 | spin_unlock(&head->lock); | |
155 | return -ENOMEM; | |
156 | } | |
157 | } | |
158 | } | |
b4ff3c90 | 159 | inet_bind_hash(child, tb, port); |
53083773 | 160 | spin_unlock(&head->lock); |
093d2823 BS |
161 | |
162 | return 0; | |
53083773 | 163 | } |
53083773 PE |
164 | EXPORT_SYMBOL_GPL(__inet_inherit_port); |
165 | ||
c25eb3bf ED |
166 | static inline int compute_score(struct sock *sk, struct net *net, |
167 | const unsigned short hnum, const __be32 daddr, | |
168 | const int dif) | |
169 | { | |
170 | int score = -1; | |
171 | struct inet_sock *inet = inet_sk(sk); | |
172 | ||
c720c7e8 | 173 | if (net_eq(sock_net(sk), net) && inet->inet_num == hnum && |
c25eb3bf | 174 | !ipv6_only_sock(sk)) { |
c720c7e8 | 175 | __be32 rcv_saddr = inet->inet_rcv_saddr; |
da5e3630 | 176 | score = sk->sk_family == PF_INET ? 2 : 1; |
c25eb3bf ED |
177 | if (rcv_saddr) { |
178 | if (rcv_saddr != daddr) | |
179 | return -1; | |
da5e3630 | 180 | score += 4; |
c25eb3bf ED |
181 | } |
182 | if (sk->sk_bound_dev_if) { | |
183 | if (sk->sk_bound_dev_if != dif) | |
184 | return -1; | |
da5e3630 | 185 | score += 4; |
c25eb3bf ED |
186 | } |
187 | } | |
188 | return score; | |
189 | } | |
190 | ||
33b62231 ACM |
191 | /* |
192 | * Don't inline this cruft. Here are some nice properties to exploit here. The | |
193 | * BSD API does not allow a listening sock to specify the remote port nor the | |
194 | * remote address for the connection. So always assume those are both | |
195 | * wildcarded during the search since they can never be otherwise. | |
196 | */ | |
e48c414e | 197 | |
c25eb3bf | 198 | |
c67499c0 PE |
199 | struct sock *__inet_lookup_listener(struct net *net, |
200 | struct inet_hashinfo *hashinfo, | |
da5e3630 | 201 | const __be32 saddr, __be16 sport, |
fb99c848 | 202 | const __be32 daddr, const unsigned short hnum, |
8f491069 | 203 | const int dif) |
99a92ff5 | 204 | { |
c25eb3bf ED |
205 | struct sock *sk, *result; |
206 | struct hlist_nulls_node *node; | |
207 | unsigned int hash = inet_lhashfn(net, hnum); | |
208 | struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash]; | |
da5e3630 TH |
209 | int score, hiscore, matches = 0, reuseport = 0; |
210 | u32 phash = 0; | |
99a92ff5 | 211 | |
c25eb3bf ED |
212 | rcu_read_lock(); |
213 | begin: | |
214 | result = NULL; | |
da5e3630 | 215 | hiscore = 0; |
c25eb3bf ED |
216 | sk_nulls_for_each_rcu(sk, node, &ilb->head) { |
217 | score = compute_score(sk, net, hnum, daddr, dif); | |
218 | if (score > hiscore) { | |
219 | result = sk; | |
220 | hiscore = score; | |
da5e3630 TH |
221 | reuseport = sk->sk_reuseport; |
222 | if (reuseport) { | |
223 | phash = inet_ehashfn(net, daddr, hnum, | |
224 | saddr, sport); | |
225 | matches = 1; | |
226 | } | |
227 | } else if (score == hiscore && reuseport) { | |
228 | matches++; | |
8fc54f68 | 229 | if (reciprocal_scale(phash, matches) == 0) |
da5e3630 TH |
230 | result = sk; |
231 | phash = next_pseudo_random32(phash); | |
c25eb3bf | 232 | } |
99a92ff5 | 233 | } |
c25eb3bf ED |
234 | /* |
235 | * if the nulls value we got at the end of this lookup is | |
236 | * not the expected one, we must restart lookup. | |
237 | * We probably met an item that was moved to another chain. | |
238 | */ | |
239 | if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE) | |
240 | goto begin; | |
241 | if (result) { | |
242 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) | |
243 | result = NULL; | |
244 | else if (unlikely(compute_score(result, net, hnum, daddr, | |
245 | dif) < hiscore)) { | |
246 | sock_put(result); | |
247 | goto begin; | |
248 | } | |
99a92ff5 | 249 | } |
c25eb3bf ED |
250 | rcu_read_unlock(); |
251 | return result; | |
99a92ff5 | 252 | } |
8f491069 | 253 | EXPORT_SYMBOL_GPL(__inet_lookup_listener); |
a7f5e7f1 | 254 | |
05dbc7b5 ED |
255 | /* All sockets share common refcount, but have different destructors */ |
256 | void sock_gen_put(struct sock *sk) | |
257 | { | |
258 | if (!atomic_dec_and_test(&sk->sk_refcnt)) | |
259 | return; | |
260 | ||
261 | if (sk->sk_state == TCP_TIME_WAIT) | |
262 | inet_twsk_free(inet_twsk(sk)); | |
41b822c5 ED |
263 | else if (sk->sk_state == TCP_NEW_SYN_RECV) |
264 | reqsk_free(inet_reqsk(sk)); | |
05dbc7b5 ED |
265 | else |
266 | sk_free(sk); | |
267 | } | |
268 | EXPORT_SYMBOL_GPL(sock_gen_put); | |
269 | ||
2c13270b ED |
270 | void sock_edemux(struct sk_buff *skb) |
271 | { | |
272 | sock_gen_put(skb->sk); | |
273 | } | |
274 | EXPORT_SYMBOL(sock_edemux); | |
275 | ||
5e73ea1a | 276 | struct sock *__inet_lookup_established(struct net *net, |
c67499c0 | 277 | struct inet_hashinfo *hashinfo, |
77a5ba55 PE |
278 | const __be32 saddr, const __be16 sport, |
279 | const __be32 daddr, const u16 hnum, | |
280 | const int dif) | |
281 | { | |
c7228317 | 282 | INET_ADDR_COOKIE(acookie, saddr, daddr); |
77a5ba55 PE |
283 | const __portpair ports = INET_COMBINED_PORTS(sport, hnum); |
284 | struct sock *sk; | |
3ab5aee7 | 285 | const struct hlist_nulls_node *node; |
77a5ba55 PE |
286 | /* Optimize here for direct hit, only listening connections can |
287 | * have wildcards anyways. | |
288 | */ | |
9f26b3ad | 289 | unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport); |
f373b53b | 290 | unsigned int slot = hash & hashinfo->ehash_mask; |
3ab5aee7 | 291 | struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; |
77a5ba55 | 292 | |
3ab5aee7 ED |
293 | rcu_read_lock(); |
294 | begin: | |
295 | sk_nulls_for_each_rcu(sk, node, &head->chain) { | |
ce43b03e ED |
296 | if (sk->sk_hash != hash) |
297 | continue; | |
298 | if (likely(INET_MATCH(sk, net, acookie, | |
299 | saddr, daddr, ports, dif))) { | |
3ab5aee7 | 300 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) |
05dbc7b5 | 301 | goto out; |
ce43b03e ED |
302 | if (unlikely(!INET_MATCH(sk, net, acookie, |
303 | saddr, daddr, ports, dif))) { | |
05dbc7b5 | 304 | sock_gen_put(sk); |
3ab5aee7 ED |
305 | goto begin; |
306 | } | |
05dbc7b5 | 307 | goto found; |
3ab5aee7 | 308 | } |
77a5ba55 | 309 | } |
3ab5aee7 ED |
310 | /* |
311 | * if the nulls value we got at the end of this lookup is | |
312 | * not the expected one, we must restart lookup. | |
313 | * We probably met an item that was moved to another chain. | |
314 | */ | |
315 | if (get_nulls_value(node) != slot) | |
316 | goto begin; | |
77a5ba55 | 317 | out: |
05dbc7b5 ED |
318 | sk = NULL; |
319 | found: | |
3ab5aee7 | 320 | rcu_read_unlock(); |
77a5ba55 | 321 | return sk; |
77a5ba55 PE |
322 | } |
323 | EXPORT_SYMBOL_GPL(__inet_lookup_established); | |
324 | ||
a7f5e7f1 ACM |
325 | /* called with local bh disabled */ |
326 | static int __inet_check_established(struct inet_timewait_death_row *death_row, | |
327 | struct sock *sk, __u16 lport, | |
328 | struct inet_timewait_sock **twp) | |
329 | { | |
330 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
331 | struct inet_sock *inet = inet_sk(sk); | |
c720c7e8 ED |
332 | __be32 daddr = inet->inet_rcv_saddr; |
333 | __be32 saddr = inet->inet_daddr; | |
a7f5e7f1 | 334 | int dif = sk->sk_bound_dev_if; |
c7228317 | 335 | INET_ADDR_COOKIE(acookie, saddr, daddr); |
c720c7e8 | 336 | const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport); |
9f26b3ad | 337 | struct net *net = sock_net(sk); |
c720c7e8 ED |
338 | unsigned int hash = inet_ehashfn(net, daddr, lport, |
339 | saddr, inet->inet_dport); | |
a7f5e7f1 | 340 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); |
9db66bdc | 341 | spinlock_t *lock = inet_ehash_lockp(hinfo, hash); |
a7f5e7f1 | 342 | struct sock *sk2; |
3ab5aee7 | 343 | const struct hlist_nulls_node *node; |
05dbc7b5 | 344 | struct inet_timewait_sock *tw = NULL; |
13475a30 | 345 | int twrefcnt = 0; |
a7f5e7f1 | 346 | |
9db66bdc | 347 | spin_lock(lock); |
a7f5e7f1 | 348 | |
3ab5aee7 | 349 | sk_nulls_for_each(sk2, node, &head->chain) { |
ce43b03e ED |
350 | if (sk2->sk_hash != hash) |
351 | continue; | |
05dbc7b5 | 352 | |
ce43b03e | 353 | if (likely(INET_MATCH(sk2, net, acookie, |
05dbc7b5 ED |
354 | saddr, daddr, ports, dif))) { |
355 | if (sk2->sk_state == TCP_TIME_WAIT) { | |
356 | tw = inet_twsk(sk2); | |
357 | if (twsk_unique(sk, sk2, twp)) | |
358 | break; | |
359 | } | |
a7f5e7f1 | 360 | goto not_unique; |
05dbc7b5 | 361 | } |
a7f5e7f1 ACM |
362 | } |
363 | ||
a7f5e7f1 | 364 | /* Must record num and sport now. Otherwise we will see |
05dbc7b5 ED |
365 | * in hash table socket with a funny identity. |
366 | */ | |
c720c7e8 ED |
367 | inet->inet_num = lport; |
368 | inet->inet_sport = htons(lport); | |
a7f5e7f1 | 369 | sk->sk_hash = hash; |
547b792c | 370 | WARN_ON(!sk_unhashed(sk)); |
3ab5aee7 | 371 | __sk_nulls_add_node_rcu(sk, &head->chain); |
13475a30 ED |
372 | if (tw) { |
373 | twrefcnt = inet_twsk_unhash(tw); | |
374 | NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); | |
375 | } | |
9db66bdc | 376 | spin_unlock(lock); |
13475a30 ED |
377 | if (twrefcnt) |
378 | inet_twsk_put(tw); | |
c29a0bc4 | 379 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
a7f5e7f1 ACM |
380 | |
381 | if (twp) { | |
382 | *twp = tw; | |
a7f5e7f1 ACM |
383 | } else if (tw) { |
384 | /* Silly. Should hash-dance instead... */ | |
789f558c | 385 | inet_twsk_deschedule(tw); |
a7f5e7f1 ACM |
386 | |
387 | inet_twsk_put(tw); | |
388 | } | |
a7f5e7f1 ACM |
389 | return 0; |
390 | ||
391 | not_unique: | |
9db66bdc | 392 | spin_unlock(lock); |
a7f5e7f1 ACM |
393 | return -EADDRNOTAVAIL; |
394 | } | |
395 | ||
396 | static inline u32 inet_sk_port_offset(const struct sock *sk) | |
397 | { | |
398 | const struct inet_sock *inet = inet_sk(sk); | |
c720c7e8 ED |
399 | return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr, |
400 | inet->inet_daddr, | |
401 | inet->inet_dport); | |
a7f5e7f1 ACM |
402 | } |
403 | ||
9327f705 | 404 | int __inet_hash_nolisten(struct sock *sk, struct inet_timewait_sock *tw) |
152da81d | 405 | { |
39d8cda7 | 406 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
3ab5aee7 | 407 | struct hlist_nulls_head *list; |
152da81d | 408 | struct inet_ehash_bucket *head; |
5b441f76 | 409 | spinlock_t *lock; |
9327f705 | 410 | int twrefcnt = 0; |
152da81d | 411 | |
547b792c | 412 | WARN_ON(!sk_unhashed(sk)); |
152da81d | 413 | |
5b441f76 | 414 | sk->sk_hash = sk_ehashfn(sk); |
152da81d PE |
415 | head = inet_ehash_bucket(hashinfo, sk->sk_hash); |
416 | list = &head->chain; | |
417 | lock = inet_ehash_lockp(hashinfo, sk->sk_hash); | |
418 | ||
9db66bdc | 419 | spin_lock(lock); |
3ab5aee7 | 420 | __sk_nulls_add_node_rcu(sk, list); |
9327f705 ED |
421 | if (tw) { |
422 | WARN_ON(sk->sk_hash != tw->tw_hash); | |
423 | twrefcnt = inet_twsk_unhash(tw); | |
424 | } | |
9db66bdc | 425 | spin_unlock(lock); |
c29a0bc4 | 426 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
9327f705 | 427 | return twrefcnt; |
152da81d PE |
428 | } |
429 | EXPORT_SYMBOL_GPL(__inet_hash_nolisten); | |
430 | ||
77a6a471 | 431 | int __inet_hash(struct sock *sk, struct inet_timewait_sock *tw) |
152da81d | 432 | { |
39d8cda7 | 433 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
5caea4ea | 434 | struct inet_listen_hashbucket *ilb; |
152da81d | 435 | |
77a6a471 ED |
436 | if (sk->sk_state != TCP_LISTEN) |
437 | return __inet_hash_nolisten(sk, tw); | |
152da81d | 438 | |
547b792c | 439 | WARN_ON(!sk_unhashed(sk)); |
5caea4ea | 440 | ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; |
152da81d | 441 | |
5caea4ea | 442 | spin_lock(&ilb->lock); |
c25eb3bf | 443 | __sk_nulls_add_node_rcu(sk, &ilb->head); |
c29a0bc4 | 444 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
5caea4ea | 445 | spin_unlock(&ilb->lock); |
77a6a471 | 446 | return 0; |
152da81d | 447 | } |
77a6a471 | 448 | EXPORT_SYMBOL(__inet_hash); |
ab1e0a13 ACM |
449 | |
450 | void inet_hash(struct sock *sk) | |
451 | { | |
452 | if (sk->sk_state != TCP_CLOSE) { | |
453 | local_bh_disable(); | |
77a6a471 | 454 | __inet_hash(sk, NULL); |
ab1e0a13 ACM |
455 | local_bh_enable(); |
456 | } | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(inet_hash); | |
459 | ||
460 | void inet_unhash(struct sock *sk) | |
461 | { | |
39d8cda7 | 462 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
c25eb3bf ED |
463 | spinlock_t *lock; |
464 | int done; | |
ab1e0a13 ACM |
465 | |
466 | if (sk_unhashed(sk)) | |
5caea4ea | 467 | return; |
ab1e0a13 | 468 | |
c25eb3bf ED |
469 | if (sk->sk_state == TCP_LISTEN) |
470 | lock = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)].lock; | |
471 | else | |
472 | lock = inet_ehash_lockp(hashinfo, sk->sk_hash); | |
5caea4ea | 473 | |
c25eb3bf | 474 | spin_lock_bh(lock); |
3b8ccd44 | 475 | done = __sk_nulls_del_node_init_rcu(sk); |
c25eb3bf ED |
476 | if (done) |
477 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
920de804 | 478 | spin_unlock_bh(lock); |
ab1e0a13 ACM |
479 | } |
480 | EXPORT_SYMBOL_GPL(inet_unhash); | |
152da81d | 481 | |
5ee31fc1 | 482 | int __inet_hash_connect(struct inet_timewait_death_row *death_row, |
5d8c0aa9 | 483 | struct sock *sk, u32 port_offset, |
5ee31fc1 | 484 | int (*check_established)(struct inet_timewait_death_row *, |
b4d6444e | 485 | struct sock *, __u16, struct inet_timewait_sock **)) |
a7f5e7f1 ACM |
486 | { |
487 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
c720c7e8 | 488 | const unsigned short snum = inet_sk(sk)->inet_num; |
e905a9ed YH |
489 | struct inet_bind_hashbucket *head; |
490 | struct inet_bind_bucket *tb; | |
a7f5e7f1 | 491 | int ret; |
3b1e0a65 | 492 | struct net *net = sock_net(sk); |
9327f705 | 493 | int twrefcnt = 1; |
a7f5e7f1 | 494 | |
e905a9ed | 495 | if (!snum) { |
227b60f5 | 496 | int i, remaining, low, high, port; |
a7f5e7f1 | 497 | static u32 hint; |
5d8c0aa9 | 498 | u32 offset = hint + port_offset; |
e905a9ed | 499 | struct inet_timewait_sock *tw = NULL; |
a7f5e7f1 | 500 | |
0bbf87d8 | 501 | inet_get_local_port_range(net, &low, &high); |
a25de534 | 502 | remaining = (high - low) + 1; |
227b60f5 | 503 | |
e905a9ed | 504 | local_bh_disable(); |
227b60f5 SH |
505 | for (i = 1; i <= remaining; i++) { |
506 | port = low + (i + offset) % remaining; | |
122ff243 | 507 | if (inet_is_local_reserved_port(net, port)) |
e3826f1e | 508 | continue; |
7f635ab7 PE |
509 | head = &hinfo->bhash[inet_bhashfn(net, port, |
510 | hinfo->bhash_size)]; | |
e905a9ed | 511 | spin_lock(&head->lock); |
a7f5e7f1 | 512 | |
e905a9ed YH |
513 | /* Does not bother with rcv_saddr checks, |
514 | * because the established check is already | |
515 | * unique enough. | |
516 | */ | |
b67bfe0d | 517 | inet_bind_bucket_for_each(tb, &head->chain) { |
09ad9bc7 OP |
518 | if (net_eq(ib_net(tb), net) && |
519 | tb->port == port) { | |
da5e3630 TH |
520 | if (tb->fastreuse >= 0 || |
521 | tb->fastreuseport >= 0) | |
e905a9ed | 522 | goto next_port; |
a9d8f911 | 523 | WARN_ON(hlist_empty(&tb->owners)); |
5ee31fc1 PE |
524 | if (!check_established(death_row, sk, |
525 | port, &tw)) | |
e905a9ed YH |
526 | goto ok; |
527 | goto next_port; | |
528 | } | |
529 | } | |
530 | ||
941b1d22 PE |
531 | tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep, |
532 | net, head, port); | |
e905a9ed YH |
533 | if (!tb) { |
534 | spin_unlock(&head->lock); | |
535 | break; | |
536 | } | |
537 | tb->fastreuse = -1; | |
da5e3630 | 538 | tb->fastreuseport = -1; |
e905a9ed YH |
539 | goto ok; |
540 | ||
541 | next_port: | |
542 | spin_unlock(&head->lock); | |
543 | } | |
544 | local_bh_enable(); | |
545 | ||
546 | return -EADDRNOTAVAIL; | |
a7f5e7f1 ACM |
547 | |
548 | ok: | |
549 | hint += i; | |
550 | ||
e905a9ed YH |
551 | /* Head lock still held and bh's disabled */ |
552 | inet_bind_hash(sk, tb, port); | |
a7f5e7f1 | 553 | if (sk_unhashed(sk)) { |
c720c7e8 | 554 | inet_sk(sk)->inet_sport = htons(port); |
b4d6444e | 555 | twrefcnt += __inet_hash_nolisten(sk, tw); |
e905a9ed | 556 | } |
3cdaedae ED |
557 | if (tw) |
558 | twrefcnt += inet_twsk_bind_unhash(tw, hinfo); | |
e905a9ed | 559 | spin_unlock(&head->lock); |
a7f5e7f1 | 560 | |
e905a9ed | 561 | if (tw) { |
789f558c | 562 | inet_twsk_deschedule(tw); |
9327f705 ED |
563 | while (twrefcnt) { |
564 | twrefcnt--; | |
565 | inet_twsk_put(tw); | |
566 | } | |
e905a9ed | 567 | } |
a7f5e7f1 ACM |
568 | |
569 | ret = 0; | |
570 | goto out; | |
e905a9ed | 571 | } |
a7f5e7f1 | 572 | |
7f635ab7 | 573 | head = &hinfo->bhash[inet_bhashfn(net, snum, hinfo->bhash_size)]; |
e905a9ed | 574 | tb = inet_csk(sk)->icsk_bind_hash; |
a7f5e7f1 ACM |
575 | spin_lock_bh(&head->lock); |
576 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
b4d6444e | 577 | __inet_hash_nolisten(sk, NULL); |
a7f5e7f1 ACM |
578 | spin_unlock_bh(&head->lock); |
579 | return 0; | |
580 | } else { | |
581 | spin_unlock(&head->lock); | |
582 | /* No definite answer... Walk to established hash table */ | |
5ee31fc1 | 583 | ret = check_established(death_row, sk, snum, NULL); |
a7f5e7f1 ACM |
584 | out: |
585 | local_bh_enable(); | |
586 | return ret; | |
587 | } | |
588 | } | |
5ee31fc1 PE |
589 | |
590 | /* | |
591 | * Bind a port for a connect operation and hash it. | |
592 | */ | |
593 | int inet_hash_connect(struct inet_timewait_death_row *death_row, | |
594 | struct sock *sk) | |
595 | { | |
5d8c0aa9 | 596 | return __inet_hash_connect(death_row, sk, inet_sk_port_offset(sk), |
b4d6444e | 597 | __inet_check_established); |
5ee31fc1 | 598 | } |
a7f5e7f1 | 599 | EXPORT_SYMBOL_GPL(inet_hash_connect); |
5caea4ea ED |
600 | |
601 | void inet_hashinfo_init(struct inet_hashinfo *h) | |
602 | { | |
603 | int i; | |
604 | ||
c25eb3bf | 605 | for (i = 0; i < INET_LHTABLE_SIZE; i++) { |
5caea4ea | 606 | spin_lock_init(&h->listening_hash[i].lock); |
c25eb3bf ED |
607 | INIT_HLIST_NULLS_HEAD(&h->listening_hash[i].head, |
608 | i + LISTENING_NULLS_BASE); | |
609 | } | |
5caea4ea | 610 | } |
5caea4ea | 611 | EXPORT_SYMBOL_GPL(inet_hashinfo_init); |