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> |
a7f5e7f1 | 24 | #include <net/ip.h> |
77d8bf9c ACM |
25 | |
26 | /* | |
27 | * Allocate and initialize a new local port bind bucket. | |
28 | * The bindhash mutex for snum's hash chain must be held here. | |
29 | */ | |
e18b890b | 30 | struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep, |
941b1d22 | 31 | struct net *net, |
77d8bf9c ACM |
32 | struct inet_bind_hashbucket *head, |
33 | const unsigned short snum) | |
34 | { | |
54e6ecb2 | 35 | struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC); |
77d8bf9c ACM |
36 | |
37 | if (tb != NULL) { | |
7a9546ee | 38 | write_pnet(&tb->ib_net, hold_net(net)); |
77d8bf9c ACM |
39 | tb->port = snum; |
40 | tb->fastreuse = 0; | |
a9d8f911 | 41 | tb->num_owners = 0; |
77d8bf9c ACM |
42 | INIT_HLIST_HEAD(&tb->owners); |
43 | hlist_add_head(&tb->node, &head->chain); | |
44 | } | |
45 | return tb; | |
46 | } | |
47 | ||
77d8bf9c ACM |
48 | /* |
49 | * Caller must hold hashbucket lock for this tb with local BH disabled | |
50 | */ | |
e18b890b | 51 | void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb) |
77d8bf9c ACM |
52 | { |
53 | if (hlist_empty(&tb->owners)) { | |
54 | __hlist_del(&tb->node); | |
7a9546ee | 55 | release_net(ib_net(tb)); |
77d8bf9c ACM |
56 | kmem_cache_free(cachep, tb); |
57 | } | |
58 | } | |
2d8c4ce5 ACM |
59 | |
60 | void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb, | |
61 | const unsigned short snum) | |
62 | { | |
a9d8f911 EP |
63 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
64 | ||
24dd1fa1 | 65 | atomic_inc(&hashinfo->bsockets); |
a9d8f911 | 66 | |
c720c7e8 | 67 | inet_sk(sk)->inet_num = snum; |
2d8c4ce5 | 68 | sk_add_bind_node(sk, &tb->owners); |
a9d8f911 | 69 | tb->num_owners++; |
463c84b9 | 70 | inet_csk(sk)->icsk_bind_hash = tb; |
2d8c4ce5 ACM |
71 | } |
72 | ||
2d8c4ce5 ACM |
73 | /* |
74 | * Get rid of any references to a local port held by the given sock. | |
75 | */ | |
ab1e0a13 | 76 | static void __inet_put_port(struct sock *sk) |
2d8c4ce5 | 77 | { |
39d8cda7 | 78 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
c720c7e8 | 79 | const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->inet_num, |
7f635ab7 | 80 | hashinfo->bhash_size); |
2d8c4ce5 ACM |
81 | struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash]; |
82 | struct inet_bind_bucket *tb; | |
83 | ||
24dd1fa1 | 84 | atomic_dec(&hashinfo->bsockets); |
a9d8f911 | 85 | |
2d8c4ce5 | 86 | spin_lock(&head->lock); |
463c84b9 | 87 | tb = inet_csk(sk)->icsk_bind_hash; |
2d8c4ce5 | 88 | __sk_del_bind_node(sk); |
a9d8f911 | 89 | tb->num_owners--; |
463c84b9 | 90 | inet_csk(sk)->icsk_bind_hash = NULL; |
c720c7e8 | 91 | inet_sk(sk)->inet_num = 0; |
2d8c4ce5 ACM |
92 | inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb); |
93 | spin_unlock(&head->lock); | |
94 | } | |
95 | ||
ab1e0a13 | 96 | void inet_put_port(struct sock *sk) |
2d8c4ce5 ACM |
97 | { |
98 | local_bh_disable(); | |
ab1e0a13 | 99 | __inet_put_port(sk); |
2d8c4ce5 ACM |
100 | local_bh_enable(); |
101 | } | |
2d8c4ce5 | 102 | EXPORT_SYMBOL(inet_put_port); |
f3f05f70 | 103 | |
53083773 PE |
104 | void __inet_inherit_port(struct sock *sk, struct sock *child) |
105 | { | |
106 | struct inet_hashinfo *table = sk->sk_prot->h.hashinfo; | |
c720c7e8 | 107 | const int bhash = inet_bhashfn(sock_net(sk), inet_sk(child)->inet_num, |
7f635ab7 | 108 | table->bhash_size); |
53083773 PE |
109 | struct inet_bind_hashbucket *head = &table->bhash[bhash]; |
110 | struct inet_bind_bucket *tb; | |
111 | ||
112 | spin_lock(&head->lock); | |
113 | tb = inet_csk(sk)->icsk_bind_hash; | |
114 | sk_add_bind_node(child, &tb->owners); | |
115 | inet_csk(child)->icsk_bind_hash = tb; | |
116 | spin_unlock(&head->lock); | |
117 | } | |
53083773 PE |
118 | EXPORT_SYMBOL_GPL(__inet_inherit_port); |
119 | ||
c25eb3bf ED |
120 | static inline int compute_score(struct sock *sk, struct net *net, |
121 | const unsigned short hnum, const __be32 daddr, | |
122 | const int dif) | |
123 | { | |
124 | int score = -1; | |
125 | struct inet_sock *inet = inet_sk(sk); | |
126 | ||
c720c7e8 | 127 | if (net_eq(sock_net(sk), net) && inet->inet_num == hnum && |
c25eb3bf | 128 | !ipv6_only_sock(sk)) { |
c720c7e8 | 129 | __be32 rcv_saddr = inet->inet_rcv_saddr; |
c25eb3bf ED |
130 | score = sk->sk_family == PF_INET ? 1 : 0; |
131 | if (rcv_saddr) { | |
132 | if (rcv_saddr != daddr) | |
133 | return -1; | |
134 | score += 2; | |
135 | } | |
136 | if (sk->sk_bound_dev_if) { | |
137 | if (sk->sk_bound_dev_if != dif) | |
138 | return -1; | |
139 | score += 2; | |
140 | } | |
141 | } | |
142 | return score; | |
143 | } | |
144 | ||
33b62231 ACM |
145 | /* |
146 | * Don't inline this cruft. Here are some nice properties to exploit here. The | |
147 | * BSD API does not allow a listening sock to specify the remote port nor the | |
148 | * remote address for the connection. So always assume those are both | |
149 | * wildcarded during the search since they can never be otherwise. | |
150 | */ | |
e48c414e | 151 | |
c25eb3bf | 152 | |
c67499c0 PE |
153 | struct sock *__inet_lookup_listener(struct net *net, |
154 | struct inet_hashinfo *hashinfo, | |
fb99c848 | 155 | const __be32 daddr, const unsigned short hnum, |
8f491069 | 156 | const int dif) |
99a92ff5 | 157 | { |
c25eb3bf ED |
158 | struct sock *sk, *result; |
159 | struct hlist_nulls_node *node; | |
160 | unsigned int hash = inet_lhashfn(net, hnum); | |
161 | struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash]; | |
162 | int score, hiscore; | |
99a92ff5 | 163 | |
c25eb3bf ED |
164 | rcu_read_lock(); |
165 | begin: | |
166 | result = NULL; | |
167 | hiscore = -1; | |
168 | sk_nulls_for_each_rcu(sk, node, &ilb->head) { | |
169 | score = compute_score(sk, net, hnum, daddr, dif); | |
170 | if (score > hiscore) { | |
171 | result = sk; | |
172 | hiscore = score; | |
173 | } | |
99a92ff5 | 174 | } |
c25eb3bf ED |
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 | } | |
99a92ff5 | 190 | } |
c25eb3bf ED |
191 | rcu_read_unlock(); |
192 | return result; | |
99a92ff5 | 193 | } |
8f491069 | 194 | EXPORT_SYMBOL_GPL(__inet_lookup_listener); |
a7f5e7f1 | 195 | |
c67499c0 PE |
196 | struct sock * __inet_lookup_established(struct net *net, |
197 | struct inet_hashinfo *hashinfo, | |
77a5ba55 PE |
198 | const __be32 saddr, const __be16 sport, |
199 | const __be32 daddr, const u16 hnum, | |
200 | const int dif) | |
201 | { | |
202 | INET_ADDR_COOKIE(acookie, saddr, daddr) | |
203 | const __portpair ports = INET_COMBINED_PORTS(sport, hnum); | |
204 | struct sock *sk; | |
3ab5aee7 | 205 | const struct hlist_nulls_node *node; |
77a5ba55 PE |
206 | /* Optimize here for direct hit, only listening connections can |
207 | * have wildcards anyways. | |
208 | */ | |
9f26b3ad | 209 | unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport); |
f373b53b | 210 | unsigned int slot = hash & hashinfo->ehash_mask; |
3ab5aee7 | 211 | struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; |
77a5ba55 | 212 | |
3ab5aee7 ED |
213 | rcu_read_lock(); |
214 | begin: | |
215 | sk_nulls_for_each_rcu(sk, node, &head->chain) { | |
c67499c0 | 216 | if (INET_MATCH(sk, net, hash, acookie, |
3ab5aee7 ED |
217 | saddr, daddr, ports, dif)) { |
218 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) | |
219 | goto begintw; | |
220 | if (unlikely(!INET_MATCH(sk, net, hash, acookie, | |
221 | saddr, daddr, ports, dif))) { | |
222 | sock_put(sk); | |
223 | goto begin; | |
224 | } | |
225 | goto out; | |
226 | } | |
77a5ba55 | 227 | } |
3ab5aee7 ED |
228 | /* |
229 | * if the nulls value we got at the end of this lookup is | |
230 | * not the expected one, we must restart lookup. | |
231 | * We probably met an item that was moved to another chain. | |
232 | */ | |
233 | if (get_nulls_value(node) != slot) | |
234 | goto begin; | |
77a5ba55 | 235 | |
3ab5aee7 | 236 | begintw: |
77a5ba55 | 237 | /* Must check for a TIME_WAIT'er before going to listener hash. */ |
3ab5aee7 | 238 | sk_nulls_for_each_rcu(sk, node, &head->twchain) { |
c67499c0 | 239 | if (INET_TW_MATCH(sk, net, hash, acookie, |
3ab5aee7 ED |
240 | saddr, daddr, ports, dif)) { |
241 | if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) { | |
242 | sk = NULL; | |
243 | goto out; | |
244 | } | |
245 | if (unlikely(!INET_TW_MATCH(sk, net, hash, acookie, | |
246 | saddr, daddr, ports, dif))) { | |
247 | sock_put(sk); | |
248 | goto begintw; | |
249 | } | |
250 | goto out; | |
251 | } | |
77a5ba55 | 252 | } |
3ab5aee7 ED |
253 | /* |
254 | * if the nulls value we got at the end of this lookup is | |
255 | * not the expected one, we must restart lookup. | |
256 | * We probably met an item that was moved to another chain. | |
257 | */ | |
258 | if (get_nulls_value(node) != slot) | |
259 | goto begintw; | |
77a5ba55 PE |
260 | sk = NULL; |
261 | out: | |
3ab5aee7 | 262 | rcu_read_unlock(); |
77a5ba55 | 263 | return sk; |
77a5ba55 PE |
264 | } |
265 | EXPORT_SYMBOL_GPL(__inet_lookup_established); | |
266 | ||
a7f5e7f1 ACM |
267 | /* called with local bh disabled */ |
268 | static int __inet_check_established(struct inet_timewait_death_row *death_row, | |
269 | struct sock *sk, __u16 lport, | |
270 | struct inet_timewait_sock **twp) | |
271 | { | |
272 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
273 | struct inet_sock *inet = inet_sk(sk); | |
c720c7e8 ED |
274 | __be32 daddr = inet->inet_rcv_saddr; |
275 | __be32 saddr = inet->inet_daddr; | |
a7f5e7f1 ACM |
276 | int dif = sk->sk_bound_dev_if; |
277 | INET_ADDR_COOKIE(acookie, saddr, daddr) | |
c720c7e8 | 278 | const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport); |
9f26b3ad | 279 | struct net *net = sock_net(sk); |
c720c7e8 ED |
280 | unsigned int hash = inet_ehashfn(net, daddr, lport, |
281 | saddr, inet->inet_dport); | |
a7f5e7f1 | 282 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); |
9db66bdc | 283 | spinlock_t *lock = inet_ehash_lockp(hinfo, hash); |
a7f5e7f1 | 284 | struct sock *sk2; |
3ab5aee7 | 285 | const struct hlist_nulls_node *node; |
a7f5e7f1 | 286 | struct inet_timewait_sock *tw; |
13475a30 | 287 | int twrefcnt = 0; |
a7f5e7f1 | 288 | |
9db66bdc | 289 | spin_lock(lock); |
a7f5e7f1 ACM |
290 | |
291 | /* Check TIME-WAIT sockets first. */ | |
3ab5aee7 | 292 | sk_nulls_for_each(sk2, node, &head->twchain) { |
a7f5e7f1 ACM |
293 | tw = inet_twsk(sk2); |
294 | ||
c67499c0 PE |
295 | if (INET_TW_MATCH(sk2, net, hash, acookie, |
296 | saddr, daddr, ports, dif)) { | |
a7f5e7f1 ACM |
297 | if (twsk_unique(sk, sk2, twp)) |
298 | goto unique; | |
299 | else | |
300 | goto not_unique; | |
301 | } | |
302 | } | |
303 | tw = NULL; | |
304 | ||
305 | /* And established part... */ | |
3ab5aee7 | 306 | sk_nulls_for_each(sk2, node, &head->chain) { |
c67499c0 PE |
307 | if (INET_MATCH(sk2, net, hash, acookie, |
308 | saddr, daddr, ports, dif)) | |
a7f5e7f1 ACM |
309 | goto not_unique; |
310 | } | |
311 | ||
312 | unique: | |
313 | /* Must record num and sport now. Otherwise we will see | |
314 | * in hash table socket with a funny identity. */ | |
c720c7e8 ED |
315 | inet->inet_num = lport; |
316 | inet->inet_sport = htons(lport); | |
a7f5e7f1 | 317 | sk->sk_hash = hash; |
547b792c | 318 | WARN_ON(!sk_unhashed(sk)); |
3ab5aee7 | 319 | __sk_nulls_add_node_rcu(sk, &head->chain); |
13475a30 ED |
320 | if (tw) { |
321 | twrefcnt = inet_twsk_unhash(tw); | |
322 | NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); | |
323 | } | |
9db66bdc | 324 | spin_unlock(lock); |
13475a30 ED |
325 | if (twrefcnt) |
326 | inet_twsk_put(tw); | |
c29a0bc4 | 327 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
a7f5e7f1 ACM |
328 | |
329 | if (twp) { | |
330 | *twp = tw; | |
a7f5e7f1 ACM |
331 | } else if (tw) { |
332 | /* Silly. Should hash-dance instead... */ | |
333 | inet_twsk_deschedule(tw, death_row); | |
a7f5e7f1 ACM |
334 | |
335 | inet_twsk_put(tw); | |
336 | } | |
a7f5e7f1 ACM |
337 | return 0; |
338 | ||
339 | not_unique: | |
9db66bdc | 340 | spin_unlock(lock); |
a7f5e7f1 ACM |
341 | return -EADDRNOTAVAIL; |
342 | } | |
343 | ||
344 | static inline u32 inet_sk_port_offset(const struct sock *sk) | |
345 | { | |
346 | const struct inet_sock *inet = inet_sk(sk); | |
c720c7e8 ED |
347 | return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr, |
348 | inet->inet_daddr, | |
349 | inet->inet_dport); | |
a7f5e7f1 ACM |
350 | } |
351 | ||
9327f705 | 352 | int __inet_hash_nolisten(struct sock *sk, struct inet_timewait_sock *tw) |
152da81d | 353 | { |
39d8cda7 | 354 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
3ab5aee7 | 355 | struct hlist_nulls_head *list; |
9db66bdc | 356 | spinlock_t *lock; |
152da81d | 357 | struct inet_ehash_bucket *head; |
9327f705 | 358 | int twrefcnt = 0; |
152da81d | 359 | |
547b792c | 360 | WARN_ON(!sk_unhashed(sk)); |
152da81d PE |
361 | |
362 | sk->sk_hash = inet_sk_ehashfn(sk); | |
363 | head = inet_ehash_bucket(hashinfo, sk->sk_hash); | |
364 | list = &head->chain; | |
365 | lock = inet_ehash_lockp(hashinfo, sk->sk_hash); | |
366 | ||
9db66bdc | 367 | spin_lock(lock); |
3ab5aee7 | 368 | __sk_nulls_add_node_rcu(sk, list); |
9327f705 ED |
369 | if (tw) { |
370 | WARN_ON(sk->sk_hash != tw->tw_hash); | |
371 | twrefcnt = inet_twsk_unhash(tw); | |
372 | } | |
9db66bdc | 373 | spin_unlock(lock); |
c29a0bc4 | 374 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
9327f705 | 375 | return twrefcnt; |
152da81d PE |
376 | } |
377 | EXPORT_SYMBOL_GPL(__inet_hash_nolisten); | |
378 | ||
ab1e0a13 | 379 | static void __inet_hash(struct sock *sk) |
152da81d | 380 | { |
39d8cda7 | 381 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
5caea4ea | 382 | struct inet_listen_hashbucket *ilb; |
152da81d PE |
383 | |
384 | if (sk->sk_state != TCP_LISTEN) { | |
9327f705 | 385 | __inet_hash_nolisten(sk, NULL); |
152da81d PE |
386 | return; |
387 | } | |
388 | ||
547b792c | 389 | WARN_ON(!sk_unhashed(sk)); |
5caea4ea | 390 | ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; |
152da81d | 391 | |
5caea4ea | 392 | spin_lock(&ilb->lock); |
c25eb3bf | 393 | __sk_nulls_add_node_rcu(sk, &ilb->head); |
c29a0bc4 | 394 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
5caea4ea | 395 | spin_unlock(&ilb->lock); |
152da81d | 396 | } |
ab1e0a13 ACM |
397 | |
398 | void inet_hash(struct sock *sk) | |
399 | { | |
400 | if (sk->sk_state != TCP_CLOSE) { | |
401 | local_bh_disable(); | |
402 | __inet_hash(sk); | |
403 | local_bh_enable(); | |
404 | } | |
405 | } | |
406 | EXPORT_SYMBOL_GPL(inet_hash); | |
407 | ||
408 | void inet_unhash(struct sock *sk) | |
409 | { | |
39d8cda7 | 410 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
c25eb3bf ED |
411 | spinlock_t *lock; |
412 | int done; | |
ab1e0a13 ACM |
413 | |
414 | if (sk_unhashed(sk)) | |
5caea4ea | 415 | return; |
ab1e0a13 | 416 | |
c25eb3bf ED |
417 | if (sk->sk_state == TCP_LISTEN) |
418 | lock = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)].lock; | |
419 | else | |
420 | lock = inet_ehash_lockp(hashinfo, sk->sk_hash); | |
5caea4ea | 421 | |
c25eb3bf ED |
422 | spin_lock_bh(lock); |
423 | done =__sk_nulls_del_node_init_rcu(sk); | |
c25eb3bf ED |
424 | if (done) |
425 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
920de804 | 426 | spin_unlock_bh(lock); |
ab1e0a13 ACM |
427 | } |
428 | EXPORT_SYMBOL_GPL(inet_unhash); | |
152da81d | 429 | |
5ee31fc1 | 430 | int __inet_hash_connect(struct inet_timewait_death_row *death_row, |
5d8c0aa9 | 431 | struct sock *sk, u32 port_offset, |
5ee31fc1 PE |
432 | int (*check_established)(struct inet_timewait_death_row *, |
433 | struct sock *, __u16, struct inet_timewait_sock **), | |
9327f705 | 434 | int (*hash)(struct sock *sk, struct inet_timewait_sock *twp)) |
a7f5e7f1 ACM |
435 | { |
436 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
c720c7e8 | 437 | const unsigned short snum = inet_sk(sk)->inet_num; |
e905a9ed YH |
438 | struct inet_bind_hashbucket *head; |
439 | struct inet_bind_bucket *tb; | |
a7f5e7f1 | 440 | int ret; |
3b1e0a65 | 441 | struct net *net = sock_net(sk); |
9327f705 | 442 | int twrefcnt = 1; |
a7f5e7f1 | 443 | |
e905a9ed | 444 | if (!snum) { |
227b60f5 | 445 | int i, remaining, low, high, port; |
a7f5e7f1 | 446 | static u32 hint; |
5d8c0aa9 | 447 | u32 offset = hint + port_offset; |
a7f5e7f1 | 448 | struct hlist_node *node; |
e905a9ed | 449 | struct inet_timewait_sock *tw = NULL; |
a7f5e7f1 | 450 | |
227b60f5 | 451 | inet_get_local_port_range(&low, &high); |
a25de534 | 452 | remaining = (high - low) + 1; |
227b60f5 | 453 | |
e905a9ed | 454 | local_bh_disable(); |
227b60f5 SH |
455 | for (i = 1; i <= remaining; i++) { |
456 | port = low + (i + offset) % remaining; | |
e3826f1e AW |
457 | if (inet_is_reserved_local_port(port)) |
458 | continue; | |
7f635ab7 PE |
459 | head = &hinfo->bhash[inet_bhashfn(net, port, |
460 | hinfo->bhash_size)]; | |
e905a9ed | 461 | spin_lock(&head->lock); |
a7f5e7f1 | 462 | |
e905a9ed YH |
463 | /* Does not bother with rcv_saddr checks, |
464 | * because the established check is already | |
465 | * unique enough. | |
466 | */ | |
a7f5e7f1 | 467 | inet_bind_bucket_for_each(tb, node, &head->chain) { |
09ad9bc7 OP |
468 | if (net_eq(ib_net(tb), net) && |
469 | tb->port == port) { | |
e905a9ed YH |
470 | if (tb->fastreuse >= 0) |
471 | goto next_port; | |
a9d8f911 | 472 | WARN_ON(hlist_empty(&tb->owners)); |
5ee31fc1 PE |
473 | if (!check_established(death_row, sk, |
474 | port, &tw)) | |
e905a9ed YH |
475 | goto ok; |
476 | goto next_port; | |
477 | } | |
478 | } | |
479 | ||
941b1d22 PE |
480 | tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep, |
481 | net, head, port); | |
e905a9ed YH |
482 | if (!tb) { |
483 | spin_unlock(&head->lock); | |
484 | break; | |
485 | } | |
486 | tb->fastreuse = -1; | |
487 | goto ok; | |
488 | ||
489 | next_port: | |
490 | spin_unlock(&head->lock); | |
491 | } | |
492 | local_bh_enable(); | |
493 | ||
494 | return -EADDRNOTAVAIL; | |
a7f5e7f1 ACM |
495 | |
496 | ok: | |
497 | hint += i; | |
498 | ||
e905a9ed YH |
499 | /* Head lock still held and bh's disabled */ |
500 | inet_bind_hash(sk, tb, port); | |
a7f5e7f1 | 501 | if (sk_unhashed(sk)) { |
c720c7e8 | 502 | inet_sk(sk)->inet_sport = htons(port); |
9327f705 | 503 | twrefcnt += hash(sk, tw); |
e905a9ed | 504 | } |
3cdaedae ED |
505 | if (tw) |
506 | twrefcnt += inet_twsk_bind_unhash(tw, hinfo); | |
e905a9ed | 507 | spin_unlock(&head->lock); |
a7f5e7f1 | 508 | |
e905a9ed YH |
509 | if (tw) { |
510 | inet_twsk_deschedule(tw, death_row); | |
9327f705 ED |
511 | while (twrefcnt) { |
512 | twrefcnt--; | |
513 | inet_twsk_put(tw); | |
514 | } | |
e905a9ed | 515 | } |
a7f5e7f1 ACM |
516 | |
517 | ret = 0; | |
518 | goto out; | |
e905a9ed | 519 | } |
a7f5e7f1 | 520 | |
7f635ab7 | 521 | head = &hinfo->bhash[inet_bhashfn(net, snum, hinfo->bhash_size)]; |
e905a9ed | 522 | tb = inet_csk(sk)->icsk_bind_hash; |
a7f5e7f1 ACM |
523 | spin_lock_bh(&head->lock); |
524 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
9327f705 | 525 | hash(sk, NULL); |
a7f5e7f1 ACM |
526 | spin_unlock_bh(&head->lock); |
527 | return 0; | |
528 | } else { | |
529 | spin_unlock(&head->lock); | |
530 | /* No definite answer... Walk to established hash table */ | |
5ee31fc1 | 531 | ret = check_established(death_row, sk, snum, NULL); |
a7f5e7f1 ACM |
532 | out: |
533 | local_bh_enable(); | |
534 | return ret; | |
535 | } | |
536 | } | |
5ee31fc1 PE |
537 | |
538 | /* | |
539 | * Bind a port for a connect operation and hash it. | |
540 | */ | |
541 | int inet_hash_connect(struct inet_timewait_death_row *death_row, | |
542 | struct sock *sk) | |
543 | { | |
5d8c0aa9 | 544 | return __inet_hash_connect(death_row, sk, inet_sk_port_offset(sk), |
5ee31fc1 PE |
545 | __inet_check_established, __inet_hash_nolisten); |
546 | } | |
a7f5e7f1 | 547 | EXPORT_SYMBOL_GPL(inet_hash_connect); |
5caea4ea ED |
548 | |
549 | void inet_hashinfo_init(struct inet_hashinfo *h) | |
550 | { | |
551 | int i; | |
552 | ||
24dd1fa1 | 553 | atomic_set(&h->bsockets, 0); |
c25eb3bf | 554 | for (i = 0; i < INET_LHTABLE_SIZE; i++) { |
5caea4ea | 555 | spin_lock_init(&h->listening_hash[i].lock); |
c25eb3bf ED |
556 | INIT_HLIST_NULLS_HEAD(&h->listening_hash[i].head, |
557 | i + LISTENING_NULLS_BASE); | |
558 | } | |
5caea4ea | 559 | } |
5caea4ea | 560 | EXPORT_SYMBOL_GPL(inet_hashinfo_init); |