Commit | Line | Data |
---|---|---|
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) { | |
8c5da49a | 38 | tb->ib_net = hold_net(net); |
77d8bf9c ACM |
39 | tb->port = snum; |
40 | tb->fastreuse = 0; | |
41 | INIT_HLIST_HEAD(&tb->owners); | |
42 | hlist_add_head(&tb->node, &head->chain); | |
43 | } | |
44 | return tb; | |
45 | } | |
46 | ||
77d8bf9c ACM |
47 | /* |
48 | * Caller must hold hashbucket lock for this tb with local BH disabled | |
49 | */ | |
e18b890b | 50 | void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb) |
77d8bf9c ACM |
51 | { |
52 | if (hlist_empty(&tb->owners)) { | |
53 | __hlist_del(&tb->node); | |
8c5da49a | 54 | release_net(tb->ib_net); |
77d8bf9c ACM |
55 | kmem_cache_free(cachep, tb); |
56 | } | |
57 | } | |
2d8c4ce5 ACM |
58 | |
59 | void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb, | |
60 | const unsigned short snum) | |
61 | { | |
463c84b9 | 62 | inet_sk(sk)->num = snum; |
2d8c4ce5 | 63 | sk_add_bind_node(sk, &tb->owners); |
463c84b9 | 64 | inet_csk(sk)->icsk_bind_hash = tb; |
2d8c4ce5 ACM |
65 | } |
66 | ||
2d8c4ce5 ACM |
67 | /* |
68 | * Get rid of any references to a local port held by the given sock. | |
69 | */ | |
ab1e0a13 | 70 | static void __inet_put_port(struct sock *sk) |
2d8c4ce5 | 71 | { |
39d8cda7 | 72 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
7f635ab7 PE |
73 | const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->num, |
74 | hashinfo->bhash_size); | |
2d8c4ce5 ACM |
75 | struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash]; |
76 | struct inet_bind_bucket *tb; | |
77 | ||
78 | spin_lock(&head->lock); | |
463c84b9 | 79 | tb = inet_csk(sk)->icsk_bind_hash; |
2d8c4ce5 | 80 | __sk_del_bind_node(sk); |
463c84b9 ACM |
81 | inet_csk(sk)->icsk_bind_hash = NULL; |
82 | inet_sk(sk)->num = 0; | |
2d8c4ce5 ACM |
83 | inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb); |
84 | spin_unlock(&head->lock); | |
85 | } | |
86 | ||
ab1e0a13 | 87 | void inet_put_port(struct sock *sk) |
2d8c4ce5 ACM |
88 | { |
89 | local_bh_disable(); | |
ab1e0a13 | 90 | __inet_put_port(sk); |
2d8c4ce5 ACM |
91 | local_bh_enable(); |
92 | } | |
93 | ||
94 | EXPORT_SYMBOL(inet_put_port); | |
f3f05f70 | 95 | |
53083773 PE |
96 | void __inet_inherit_port(struct sock *sk, struct sock *child) |
97 | { | |
98 | struct inet_hashinfo *table = sk->sk_prot->h.hashinfo; | |
7f635ab7 PE |
99 | const int bhash = inet_bhashfn(sock_net(sk), inet_sk(child)->num, |
100 | table->bhash_size); | |
53083773 PE |
101 | struct inet_bind_hashbucket *head = &table->bhash[bhash]; |
102 | struct inet_bind_bucket *tb; | |
103 | ||
104 | spin_lock(&head->lock); | |
105 | tb = inet_csk(sk)->icsk_bind_hash; | |
106 | sk_add_bind_node(child, &tb->owners); | |
107 | inet_csk(child)->icsk_bind_hash = tb; | |
108 | spin_unlock(&head->lock); | |
109 | } | |
110 | ||
111 | EXPORT_SYMBOL_GPL(__inet_inherit_port); | |
112 | ||
f3f05f70 ACM |
113 | /* |
114 | * This lock without WQ_FLAG_EXCLUSIVE is good on UP and it can be very bad on SMP. | |
115 | * Look, when several writers sleep and reader wakes them up, all but one | |
116 | * immediately hit write lock and grab all the cpus. Exclusive sleep solves | |
117 | * this, _but_ remember, it adds useless work on UP machines (wake up each | |
118 | * exclusive lock release). It should be ifdefed really. | |
119 | */ | |
120 | void inet_listen_wlock(struct inet_hashinfo *hashinfo) | |
9a429c49 | 121 | __acquires(hashinfo->lhash_lock) |
f3f05f70 ACM |
122 | { |
123 | write_lock(&hashinfo->lhash_lock); | |
124 | ||
125 | if (atomic_read(&hashinfo->lhash_users)) { | |
126 | DEFINE_WAIT(wait); | |
127 | ||
128 | for (;;) { | |
129 | prepare_to_wait_exclusive(&hashinfo->lhash_wait, | |
130 | &wait, TASK_UNINTERRUPTIBLE); | |
131 | if (!atomic_read(&hashinfo->lhash_users)) | |
132 | break; | |
133 | write_unlock_bh(&hashinfo->lhash_lock); | |
134 | schedule(); | |
135 | write_lock_bh(&hashinfo->lhash_lock); | |
136 | } | |
137 | ||
138 | finish_wait(&hashinfo->lhash_wait, &wait); | |
139 | } | |
140 | } | |
141 | ||
33b62231 ACM |
142 | /* |
143 | * Don't inline this cruft. Here are some nice properties to exploit here. The | |
144 | * BSD API does not allow a listening sock to specify the remote port nor the | |
145 | * remote address for the connection. So always assume those are both | |
146 | * wildcarded during the search since they can never be otherwise. | |
147 | */ | |
c67499c0 PE |
148 | static struct sock *inet_lookup_listener_slow(struct net *net, |
149 | const struct hlist_head *head, | |
fb99c848 | 150 | const __be32 daddr, |
8f491069 HX |
151 | const unsigned short hnum, |
152 | const int dif) | |
33b62231 ACM |
153 | { |
154 | struct sock *result = NULL, *sk; | |
155 | const struct hlist_node *node; | |
156 | int hiscore = -1; | |
157 | ||
158 | sk_for_each(sk, node, head) { | |
159 | const struct inet_sock *inet = inet_sk(sk); | |
160 | ||
878628fb | 161 | if (net_eq(sock_net(sk), net) && inet->num == hnum && |
c67499c0 | 162 | !ipv6_only_sock(sk)) { |
fb99c848 | 163 | const __be32 rcv_saddr = inet->rcv_saddr; |
33b62231 ACM |
164 | int score = sk->sk_family == PF_INET ? 1 : 0; |
165 | ||
166 | if (rcv_saddr) { | |
167 | if (rcv_saddr != daddr) | |
168 | continue; | |
169 | score += 2; | |
170 | } | |
171 | if (sk->sk_bound_dev_if) { | |
172 | if (sk->sk_bound_dev_if != dif) | |
173 | continue; | |
174 | score += 2; | |
175 | } | |
176 | if (score == 5) | |
177 | return sk; | |
178 | if (score > hiscore) { | |
179 | hiscore = score; | |
180 | result = sk; | |
181 | } | |
182 | } | |
183 | } | |
184 | return result; | |
185 | } | |
e48c414e | 186 | |
99a92ff5 | 187 | /* Optimize the common listener case. */ |
c67499c0 PE |
188 | struct sock *__inet_lookup_listener(struct net *net, |
189 | struct inet_hashinfo *hashinfo, | |
fb99c848 | 190 | const __be32 daddr, const unsigned short hnum, |
8f491069 | 191 | const int dif) |
99a92ff5 HX |
192 | { |
193 | struct sock *sk = NULL; | |
194 | const struct hlist_head *head; | |
195 | ||
196 | read_lock(&hashinfo->lhash_lock); | |
2086a650 | 197 | head = &hashinfo->listening_hash[inet_lhashfn(net, hnum)]; |
99a92ff5 HX |
198 | if (!hlist_empty(head)) { |
199 | const struct inet_sock *inet = inet_sk((sk = __sk_head(head))); | |
200 | ||
201 | if (inet->num == hnum && !sk->sk_node.next && | |
202 | (!inet->rcv_saddr || inet->rcv_saddr == daddr) && | |
203 | (sk->sk_family == PF_INET || !ipv6_only_sock(sk)) && | |
878628fb | 204 | !sk->sk_bound_dev_if && net_eq(sock_net(sk), net)) |
99a92ff5 | 205 | goto sherry_cache; |
c67499c0 | 206 | sk = inet_lookup_listener_slow(net, head, daddr, hnum, dif); |
99a92ff5 HX |
207 | } |
208 | if (sk) { | |
209 | sherry_cache: | |
210 | sock_hold(sk); | |
211 | } | |
212 | read_unlock(&hashinfo->lhash_lock); | |
213 | return sk; | |
214 | } | |
8f491069 | 215 | EXPORT_SYMBOL_GPL(__inet_lookup_listener); |
a7f5e7f1 | 216 | |
c67499c0 PE |
217 | struct sock * __inet_lookup_established(struct net *net, |
218 | struct inet_hashinfo *hashinfo, | |
77a5ba55 PE |
219 | const __be32 saddr, const __be16 sport, |
220 | const __be32 daddr, const u16 hnum, | |
221 | const int dif) | |
222 | { | |
223 | INET_ADDR_COOKIE(acookie, saddr, daddr) | |
224 | const __portpair ports = INET_COMBINED_PORTS(sport, hnum); | |
225 | struct sock *sk; | |
226 | const struct hlist_node *node; | |
227 | /* Optimize here for direct hit, only listening connections can | |
228 | * have wildcards anyways. | |
229 | */ | |
9f26b3ad | 230 | unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport); |
77a5ba55 PE |
231 | struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash); |
232 | rwlock_t *lock = inet_ehash_lockp(hashinfo, hash); | |
233 | ||
234 | prefetch(head->chain.first); | |
235 | read_lock(lock); | |
236 | sk_for_each(sk, node, &head->chain) { | |
c67499c0 PE |
237 | if (INET_MATCH(sk, net, hash, acookie, |
238 | saddr, daddr, ports, dif)) | |
77a5ba55 PE |
239 | goto hit; /* You sunk my battleship! */ |
240 | } | |
241 | ||
242 | /* Must check for a TIME_WAIT'er before going to listener hash. */ | |
243 | sk_for_each(sk, node, &head->twchain) { | |
c67499c0 PE |
244 | if (INET_TW_MATCH(sk, net, hash, acookie, |
245 | saddr, daddr, ports, dif)) | |
77a5ba55 PE |
246 | goto hit; |
247 | } | |
248 | sk = NULL; | |
249 | out: | |
250 | read_unlock(lock); | |
251 | return sk; | |
252 | hit: | |
253 | sock_hold(sk); | |
254 | goto out; | |
255 | } | |
256 | EXPORT_SYMBOL_GPL(__inet_lookup_established); | |
257 | ||
a7f5e7f1 ACM |
258 | /* called with local bh disabled */ |
259 | static int __inet_check_established(struct inet_timewait_death_row *death_row, | |
260 | struct sock *sk, __u16 lport, | |
261 | struct inet_timewait_sock **twp) | |
262 | { | |
263 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
264 | struct inet_sock *inet = inet_sk(sk); | |
fb99c848 AV |
265 | __be32 daddr = inet->rcv_saddr; |
266 | __be32 saddr = inet->daddr; | |
a7f5e7f1 ACM |
267 | int dif = sk->sk_bound_dev_if; |
268 | INET_ADDR_COOKIE(acookie, saddr, daddr) | |
4f765d84 | 269 | const __portpair ports = INET_COMBINED_PORTS(inet->dport, lport); |
9f26b3ad PE |
270 | struct net *net = sock_net(sk); |
271 | unsigned int hash = inet_ehashfn(net, daddr, lport, saddr, inet->dport); | |
a7f5e7f1 | 272 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); |
230140cf | 273 | rwlock_t *lock = inet_ehash_lockp(hinfo, hash); |
a7f5e7f1 ACM |
274 | struct sock *sk2; |
275 | const struct hlist_node *node; | |
276 | struct inet_timewait_sock *tw; | |
277 | ||
278 | prefetch(head->chain.first); | |
230140cf | 279 | write_lock(lock); |
a7f5e7f1 ACM |
280 | |
281 | /* Check TIME-WAIT sockets first. */ | |
dbca9b27 | 282 | sk_for_each(sk2, node, &head->twchain) { |
a7f5e7f1 ACM |
283 | tw = inet_twsk(sk2); |
284 | ||
c67499c0 PE |
285 | if (INET_TW_MATCH(sk2, net, hash, acookie, |
286 | saddr, daddr, ports, dif)) { | |
a7f5e7f1 ACM |
287 | if (twsk_unique(sk, sk2, twp)) |
288 | goto unique; | |
289 | else | |
290 | goto not_unique; | |
291 | } | |
292 | } | |
293 | tw = NULL; | |
294 | ||
295 | /* And established part... */ | |
296 | sk_for_each(sk2, node, &head->chain) { | |
c67499c0 PE |
297 | if (INET_MATCH(sk2, net, hash, acookie, |
298 | saddr, daddr, ports, dif)) | |
a7f5e7f1 ACM |
299 | goto not_unique; |
300 | } | |
301 | ||
302 | unique: | |
303 | /* Must record num and sport now. Otherwise we will see | |
304 | * in hash table socket with a funny identity. */ | |
305 | inet->num = lport; | |
306 | inet->sport = htons(lport); | |
307 | sk->sk_hash = hash; | |
547b792c | 308 | WARN_ON(!sk_unhashed(sk)); |
a7f5e7f1 | 309 | __sk_add_node(sk, &head->chain); |
c29a0bc4 | 310 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
230140cf | 311 | write_unlock(lock); |
a7f5e7f1 ACM |
312 | |
313 | if (twp) { | |
314 | *twp = tw; | |
de0744af | 315 | NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); |
a7f5e7f1 ACM |
316 | } else if (tw) { |
317 | /* Silly. Should hash-dance instead... */ | |
318 | inet_twsk_deschedule(tw, death_row); | |
de0744af | 319 | NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); |
a7f5e7f1 ACM |
320 | |
321 | inet_twsk_put(tw); | |
322 | } | |
323 | ||
324 | return 0; | |
325 | ||
326 | not_unique: | |
230140cf | 327 | write_unlock(lock); |
a7f5e7f1 ACM |
328 | return -EADDRNOTAVAIL; |
329 | } | |
330 | ||
331 | static inline u32 inet_sk_port_offset(const struct sock *sk) | |
332 | { | |
333 | const struct inet_sock *inet = inet_sk(sk); | |
e905a9ed | 334 | return secure_ipv4_port_ephemeral(inet->rcv_saddr, inet->daddr, |
a7f5e7f1 ACM |
335 | inet->dport); |
336 | } | |
337 | ||
ab1e0a13 | 338 | void __inet_hash_nolisten(struct sock *sk) |
152da81d | 339 | { |
39d8cda7 | 340 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
152da81d PE |
341 | struct hlist_head *list; |
342 | rwlock_t *lock; | |
343 | struct inet_ehash_bucket *head; | |
344 | ||
547b792c | 345 | WARN_ON(!sk_unhashed(sk)); |
152da81d PE |
346 | |
347 | sk->sk_hash = inet_sk_ehashfn(sk); | |
348 | head = inet_ehash_bucket(hashinfo, sk->sk_hash); | |
349 | list = &head->chain; | |
350 | lock = inet_ehash_lockp(hashinfo, sk->sk_hash); | |
351 | ||
352 | write_lock(lock); | |
353 | __sk_add_node(sk, list); | |
c29a0bc4 | 354 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
152da81d PE |
355 | write_unlock(lock); |
356 | } | |
357 | EXPORT_SYMBOL_GPL(__inet_hash_nolisten); | |
358 | ||
ab1e0a13 | 359 | static void __inet_hash(struct sock *sk) |
152da81d | 360 | { |
39d8cda7 | 361 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
152da81d PE |
362 | struct hlist_head *list; |
363 | rwlock_t *lock; | |
364 | ||
365 | if (sk->sk_state != TCP_LISTEN) { | |
ab1e0a13 | 366 | __inet_hash_nolisten(sk); |
152da81d PE |
367 | return; |
368 | } | |
369 | ||
547b792c | 370 | WARN_ON(!sk_unhashed(sk)); |
152da81d PE |
371 | list = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; |
372 | lock = &hashinfo->lhash_lock; | |
373 | ||
374 | inet_listen_wlock(hashinfo); | |
375 | __sk_add_node(sk, list); | |
c29a0bc4 | 376 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
152da81d PE |
377 | write_unlock(lock); |
378 | wake_up(&hashinfo->lhash_wait); | |
379 | } | |
ab1e0a13 ACM |
380 | |
381 | void inet_hash(struct sock *sk) | |
382 | { | |
383 | if (sk->sk_state != TCP_CLOSE) { | |
384 | local_bh_disable(); | |
385 | __inet_hash(sk); | |
386 | local_bh_enable(); | |
387 | } | |
388 | } | |
389 | EXPORT_SYMBOL_GPL(inet_hash); | |
390 | ||
391 | void inet_unhash(struct sock *sk) | |
392 | { | |
393 | rwlock_t *lock; | |
39d8cda7 | 394 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
ab1e0a13 ACM |
395 | |
396 | if (sk_unhashed(sk)) | |
397 | goto out; | |
398 | ||
399 | if (sk->sk_state == TCP_LISTEN) { | |
400 | local_bh_disable(); | |
401 | inet_listen_wlock(hashinfo); | |
402 | lock = &hashinfo->lhash_lock; | |
403 | } else { | |
404 | lock = inet_ehash_lockp(hashinfo, sk->sk_hash); | |
405 | write_lock_bh(lock); | |
406 | } | |
407 | ||
408 | if (__sk_del_node_init(sk)) | |
c29a0bc4 | 409 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
ab1e0a13 ACM |
410 | write_unlock_bh(lock); |
411 | out: | |
412 | if (sk->sk_state == TCP_LISTEN) | |
413 | wake_up(&hashinfo->lhash_wait); | |
414 | } | |
415 | EXPORT_SYMBOL_GPL(inet_unhash); | |
152da81d | 416 | |
5ee31fc1 | 417 | int __inet_hash_connect(struct inet_timewait_death_row *death_row, |
5d8c0aa9 | 418 | struct sock *sk, u32 port_offset, |
5ee31fc1 PE |
419 | int (*check_established)(struct inet_timewait_death_row *, |
420 | struct sock *, __u16, struct inet_timewait_sock **), | |
ab1e0a13 | 421 | void (*hash)(struct sock *sk)) |
a7f5e7f1 ACM |
422 | { |
423 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
424 | const unsigned short snum = inet_sk(sk)->num; | |
e905a9ed YH |
425 | struct inet_bind_hashbucket *head; |
426 | struct inet_bind_bucket *tb; | |
a7f5e7f1 | 427 | int ret; |
3b1e0a65 | 428 | struct net *net = sock_net(sk); |
a7f5e7f1 | 429 | |
e905a9ed | 430 | if (!snum) { |
227b60f5 | 431 | int i, remaining, low, high, port; |
a7f5e7f1 | 432 | static u32 hint; |
5d8c0aa9 | 433 | u32 offset = hint + port_offset; |
a7f5e7f1 | 434 | struct hlist_node *node; |
e905a9ed | 435 | struct inet_timewait_sock *tw = NULL; |
a7f5e7f1 | 436 | |
227b60f5 | 437 | inet_get_local_port_range(&low, &high); |
a25de534 | 438 | remaining = (high - low) + 1; |
227b60f5 | 439 | |
e905a9ed | 440 | local_bh_disable(); |
227b60f5 SH |
441 | for (i = 1; i <= remaining; i++) { |
442 | port = low + (i + offset) % remaining; | |
7f635ab7 PE |
443 | head = &hinfo->bhash[inet_bhashfn(net, port, |
444 | hinfo->bhash_size)]; | |
e905a9ed | 445 | spin_lock(&head->lock); |
a7f5e7f1 | 446 | |
e905a9ed YH |
447 | /* Does not bother with rcv_saddr checks, |
448 | * because the established check is already | |
449 | * unique enough. | |
450 | */ | |
a7f5e7f1 | 451 | inet_bind_bucket_for_each(tb, node, &head->chain) { |
941b1d22 | 452 | if (tb->ib_net == net && tb->port == port) { |
547b792c | 453 | WARN_ON(hlist_empty(&tb->owners)); |
e905a9ed YH |
454 | if (tb->fastreuse >= 0) |
455 | goto next_port; | |
5ee31fc1 PE |
456 | if (!check_established(death_row, sk, |
457 | port, &tw)) | |
e905a9ed YH |
458 | goto ok; |
459 | goto next_port; | |
460 | } | |
461 | } | |
462 | ||
941b1d22 PE |
463 | tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep, |
464 | net, head, port); | |
e905a9ed YH |
465 | if (!tb) { |
466 | spin_unlock(&head->lock); | |
467 | break; | |
468 | } | |
469 | tb->fastreuse = -1; | |
470 | goto ok; | |
471 | ||
472 | next_port: | |
473 | spin_unlock(&head->lock); | |
474 | } | |
475 | local_bh_enable(); | |
476 | ||
477 | return -EADDRNOTAVAIL; | |
a7f5e7f1 ACM |
478 | |
479 | ok: | |
480 | hint += i; | |
481 | ||
e905a9ed YH |
482 | /* Head lock still held and bh's disabled */ |
483 | inet_bind_hash(sk, tb, port); | |
a7f5e7f1 | 484 | if (sk_unhashed(sk)) { |
e905a9ed | 485 | inet_sk(sk)->sport = htons(port); |
ab1e0a13 | 486 | hash(sk); |
e905a9ed YH |
487 | } |
488 | spin_unlock(&head->lock); | |
a7f5e7f1 | 489 | |
e905a9ed YH |
490 | if (tw) { |
491 | inet_twsk_deschedule(tw, death_row); | |
492 | inet_twsk_put(tw); | |
493 | } | |
a7f5e7f1 ACM |
494 | |
495 | ret = 0; | |
496 | goto out; | |
e905a9ed | 497 | } |
a7f5e7f1 | 498 | |
7f635ab7 | 499 | head = &hinfo->bhash[inet_bhashfn(net, snum, hinfo->bhash_size)]; |
e905a9ed | 500 | tb = inet_csk(sk)->icsk_bind_hash; |
a7f5e7f1 ACM |
501 | spin_lock_bh(&head->lock); |
502 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
ab1e0a13 | 503 | hash(sk); |
a7f5e7f1 ACM |
504 | spin_unlock_bh(&head->lock); |
505 | return 0; | |
506 | } else { | |
507 | spin_unlock(&head->lock); | |
508 | /* No definite answer... Walk to established hash table */ | |
5ee31fc1 | 509 | ret = check_established(death_row, sk, snum, NULL); |
a7f5e7f1 ACM |
510 | out: |
511 | local_bh_enable(); | |
512 | return ret; | |
513 | } | |
514 | } | |
5ee31fc1 PE |
515 | |
516 | /* | |
517 | * Bind a port for a connect operation and hash it. | |
518 | */ | |
519 | int inet_hash_connect(struct inet_timewait_death_row *death_row, | |
520 | struct sock *sk) | |
521 | { | |
5d8c0aa9 | 522 | return __inet_hash_connect(death_row, sk, inet_sk_port_offset(sk), |
5ee31fc1 PE |
523 | __inet_check_established, __inet_hash_nolisten); |
524 | } | |
a7f5e7f1 ACM |
525 | |
526 | EXPORT_SYMBOL_GPL(inet_hash_connect); |