Commit | Line | Data |
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3f421baa 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 | * Support for INET connection oriented protocols. | |
7 | * | |
8 | * Authors: See the TCP sources | |
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 | ||
3f421baa ACM |
16 | #include <linux/module.h> |
17 | #include <linux/jhash.h> | |
18 | ||
19 | #include <net/inet_connection_sock.h> | |
20 | #include <net/inet_hashtables.h> | |
21 | #include <net/inet_timewait_sock.h> | |
22 | #include <net/ip.h> | |
23 | #include <net/route.h> | |
24 | #include <net/tcp_states.h> | |
a019d6fe | 25 | #include <net/xfrm.h> |
3f421baa ACM |
26 | |
27 | #ifdef INET_CSK_DEBUG | |
28 | const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n"; | |
29 | EXPORT_SYMBOL(inet_csk_timer_bug_msg); | |
30 | #endif | |
31 | ||
32 | /* | |
33 | * This array holds the first and last local port number. | |
3f421baa | 34 | */ |
3f196eb5 | 35 | int sysctl_local_port_range[2] = { 32768, 61000 }; |
3f421baa | 36 | |
971af18b ACM |
37 | int inet_csk_bind_conflict(const struct sock *sk, |
38 | const struct inet_bind_bucket *tb) | |
3f421baa | 39 | { |
82103232 | 40 | const __be32 sk_rcv_saddr = inet_rcv_saddr(sk); |
3f421baa ACM |
41 | struct sock *sk2; |
42 | struct hlist_node *node; | |
43 | int reuse = sk->sk_reuse; | |
44 | ||
45 | sk_for_each_bound(sk2, node, &tb->owners) { | |
46 | if (sk != sk2 && | |
47 | !inet_v6_ipv6only(sk2) && | |
48 | (!sk->sk_bound_dev_if || | |
49 | !sk2->sk_bound_dev_if || | |
50 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { | |
51 | if (!reuse || !sk2->sk_reuse || | |
52 | sk2->sk_state == TCP_LISTEN) { | |
82103232 | 53 | const __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); |
3f421baa ACM |
54 | if (!sk2_rcv_saddr || !sk_rcv_saddr || |
55 | sk2_rcv_saddr == sk_rcv_saddr) | |
56 | break; | |
57 | } | |
58 | } | |
59 | } | |
60 | return node != NULL; | |
61 | } | |
62 | ||
971af18b ACM |
63 | EXPORT_SYMBOL_GPL(inet_csk_bind_conflict); |
64 | ||
3f421baa ACM |
65 | /* Obtain a reference to a local port for the given sock, |
66 | * if snum is zero it means select any available local port. | |
67 | */ | |
68 | int inet_csk_get_port(struct inet_hashinfo *hashinfo, | |
971af18b ACM |
69 | struct sock *sk, unsigned short snum, |
70 | int (*bind_conflict)(const struct sock *sk, | |
71 | const struct inet_bind_bucket *tb)) | |
3f421baa ACM |
72 | { |
73 | struct inet_bind_hashbucket *head; | |
74 | struct hlist_node *node; | |
75 | struct inet_bind_bucket *tb; | |
76 | int ret; | |
77 | ||
78 | local_bh_disable(); | |
79 | if (!snum) { | |
80 | int low = sysctl_local_port_range[0]; | |
81 | int high = sysctl_local_port_range[1]; | |
82 | int remaining = (high - low) + 1; | |
6df71634 | 83 | int rover = net_random() % (high - low) + low; |
3f421baa | 84 | |
3f421baa | 85 | do { |
3f421baa ACM |
86 | head = &hashinfo->bhash[inet_bhashfn(rover, hashinfo->bhash_size)]; |
87 | spin_lock(&head->lock); | |
88 | inet_bind_bucket_for_each(tb, node, &head->chain) | |
89 | if (tb->port == rover) | |
90 | goto next; | |
91 | break; | |
92 | next: | |
93 | spin_unlock(&head->lock); | |
6df71634 SH |
94 | if (++rover > high) |
95 | rover = low; | |
3f421baa | 96 | } while (--remaining > 0); |
3f421baa ACM |
97 | |
98 | /* Exhausted local port range during search? It is not | |
99 | * possible for us to be holding one of the bind hash | |
100 | * locks if this test triggers, because if 'remaining' | |
101 | * drops to zero, we broke out of the do/while loop at | |
102 | * the top level, not from the 'break;' statement. | |
103 | */ | |
104 | ret = 1; | |
105 | if (remaining <= 0) | |
106 | goto fail; | |
107 | ||
108 | /* OK, here is the one we will use. HEAD is | |
109 | * non-NULL and we hold it's mutex. | |
110 | */ | |
111 | snum = rover; | |
112 | } else { | |
113 | head = &hashinfo->bhash[inet_bhashfn(snum, hashinfo->bhash_size)]; | |
114 | spin_lock(&head->lock); | |
115 | inet_bind_bucket_for_each(tb, node, &head->chain) | |
116 | if (tb->port == snum) | |
117 | goto tb_found; | |
118 | } | |
119 | tb = NULL; | |
120 | goto tb_not_found; | |
121 | tb_found: | |
122 | if (!hlist_empty(&tb->owners)) { | |
123 | if (sk->sk_reuse > 1) | |
124 | goto success; | |
125 | if (tb->fastreuse > 0 && | |
126 | sk->sk_reuse && sk->sk_state != TCP_LISTEN) { | |
127 | goto success; | |
128 | } else { | |
129 | ret = 1; | |
971af18b | 130 | if (bind_conflict(sk, tb)) |
3f421baa ACM |
131 | goto fail_unlock; |
132 | } | |
133 | } | |
134 | tb_not_found: | |
135 | ret = 1; | |
136 | if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, head, snum)) == NULL) | |
137 | goto fail_unlock; | |
138 | if (hlist_empty(&tb->owners)) { | |
139 | if (sk->sk_reuse && sk->sk_state != TCP_LISTEN) | |
140 | tb->fastreuse = 1; | |
141 | else | |
142 | tb->fastreuse = 0; | |
143 | } else if (tb->fastreuse && | |
144 | (!sk->sk_reuse || sk->sk_state == TCP_LISTEN)) | |
145 | tb->fastreuse = 0; | |
146 | success: | |
147 | if (!inet_csk(sk)->icsk_bind_hash) | |
148 | inet_bind_hash(sk, tb, snum); | |
149 | BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb); | |
e905a9ed | 150 | ret = 0; |
3f421baa ACM |
151 | |
152 | fail_unlock: | |
153 | spin_unlock(&head->lock); | |
154 | fail: | |
155 | local_bh_enable(); | |
156 | return ret; | |
157 | } | |
158 | ||
159 | EXPORT_SYMBOL_GPL(inet_csk_get_port); | |
160 | ||
161 | /* | |
162 | * Wait for an incoming connection, avoid race conditions. This must be called | |
163 | * with the socket locked. | |
164 | */ | |
165 | static int inet_csk_wait_for_connect(struct sock *sk, long timeo) | |
166 | { | |
167 | struct inet_connection_sock *icsk = inet_csk(sk); | |
168 | DEFINE_WAIT(wait); | |
169 | int err; | |
170 | ||
171 | /* | |
172 | * True wake-one mechanism for incoming connections: only | |
173 | * one process gets woken up, not the 'whole herd'. | |
174 | * Since we do not 'race & poll' for established sockets | |
175 | * anymore, the common case will execute the loop only once. | |
176 | * | |
177 | * Subtle issue: "add_wait_queue_exclusive()" will be added | |
178 | * after any current non-exclusive waiters, and we know that | |
179 | * it will always _stay_ after any new non-exclusive waiters | |
180 | * because all non-exclusive waiters are added at the | |
181 | * beginning of the wait-queue. As such, it's ok to "drop" | |
182 | * our exclusiveness temporarily when we get woken up without | |
183 | * having to remove and re-insert us on the wait queue. | |
184 | */ | |
185 | for (;;) { | |
186 | prepare_to_wait_exclusive(sk->sk_sleep, &wait, | |
187 | TASK_INTERRUPTIBLE); | |
188 | release_sock(sk); | |
189 | if (reqsk_queue_empty(&icsk->icsk_accept_queue)) | |
190 | timeo = schedule_timeout(timeo); | |
191 | lock_sock(sk); | |
192 | err = 0; | |
193 | if (!reqsk_queue_empty(&icsk->icsk_accept_queue)) | |
194 | break; | |
195 | err = -EINVAL; | |
196 | if (sk->sk_state != TCP_LISTEN) | |
197 | break; | |
198 | err = sock_intr_errno(timeo); | |
199 | if (signal_pending(current)) | |
200 | break; | |
201 | err = -EAGAIN; | |
202 | if (!timeo) | |
203 | break; | |
204 | } | |
205 | finish_wait(sk->sk_sleep, &wait); | |
206 | return err; | |
207 | } | |
208 | ||
209 | /* | |
210 | * This will accept the next outstanding connection. | |
211 | */ | |
212 | struct sock *inet_csk_accept(struct sock *sk, int flags, int *err) | |
213 | { | |
214 | struct inet_connection_sock *icsk = inet_csk(sk); | |
215 | struct sock *newsk; | |
216 | int error; | |
217 | ||
218 | lock_sock(sk); | |
219 | ||
220 | /* We need to make sure that this socket is listening, | |
221 | * and that it has something pending. | |
222 | */ | |
223 | error = -EINVAL; | |
224 | if (sk->sk_state != TCP_LISTEN) | |
225 | goto out_err; | |
226 | ||
227 | /* Find already established connection */ | |
228 | if (reqsk_queue_empty(&icsk->icsk_accept_queue)) { | |
229 | long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
230 | ||
231 | /* If this is a non blocking socket don't sleep */ | |
232 | error = -EAGAIN; | |
233 | if (!timeo) | |
234 | goto out_err; | |
235 | ||
236 | error = inet_csk_wait_for_connect(sk, timeo); | |
237 | if (error) | |
238 | goto out_err; | |
239 | } | |
240 | ||
241 | newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk); | |
242 | BUG_TRAP(newsk->sk_state != TCP_SYN_RECV); | |
243 | out: | |
244 | release_sock(sk); | |
245 | return newsk; | |
246 | out_err: | |
247 | newsk = NULL; | |
248 | *err = error; | |
249 | goto out; | |
250 | } | |
251 | ||
252 | EXPORT_SYMBOL(inet_csk_accept); | |
253 | ||
254 | /* | |
255 | * Using different timers for retransmit, delayed acks and probes | |
e905a9ed | 256 | * We may wish use just one timer maintaining a list of expire jiffies |
3f421baa ACM |
257 | * to optimize. |
258 | */ | |
259 | void inet_csk_init_xmit_timers(struct sock *sk, | |
260 | void (*retransmit_handler)(unsigned long), | |
261 | void (*delack_handler)(unsigned long), | |
262 | void (*keepalive_handler)(unsigned long)) | |
263 | { | |
264 | struct inet_connection_sock *icsk = inet_csk(sk); | |
265 | ||
266 | init_timer(&icsk->icsk_retransmit_timer); | |
267 | init_timer(&icsk->icsk_delack_timer); | |
268 | init_timer(&sk->sk_timer); | |
269 | ||
270 | icsk->icsk_retransmit_timer.function = retransmit_handler; | |
271 | icsk->icsk_delack_timer.function = delack_handler; | |
272 | sk->sk_timer.function = keepalive_handler; | |
273 | ||
e905a9ed | 274 | icsk->icsk_retransmit_timer.data = |
3f421baa ACM |
275 | icsk->icsk_delack_timer.data = |
276 | sk->sk_timer.data = (unsigned long)sk; | |
277 | ||
278 | icsk->icsk_pending = icsk->icsk_ack.pending = 0; | |
279 | } | |
280 | ||
281 | EXPORT_SYMBOL(inet_csk_init_xmit_timers); | |
282 | ||
283 | void inet_csk_clear_xmit_timers(struct sock *sk) | |
284 | { | |
285 | struct inet_connection_sock *icsk = inet_csk(sk); | |
286 | ||
287 | icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0; | |
288 | ||
289 | sk_stop_timer(sk, &icsk->icsk_retransmit_timer); | |
290 | sk_stop_timer(sk, &icsk->icsk_delack_timer); | |
291 | sk_stop_timer(sk, &sk->sk_timer); | |
292 | } | |
293 | ||
294 | EXPORT_SYMBOL(inet_csk_clear_xmit_timers); | |
295 | ||
296 | void inet_csk_delete_keepalive_timer(struct sock *sk) | |
297 | { | |
298 | sk_stop_timer(sk, &sk->sk_timer); | |
299 | } | |
300 | ||
301 | EXPORT_SYMBOL(inet_csk_delete_keepalive_timer); | |
302 | ||
303 | void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len) | |
304 | { | |
305 | sk_reset_timer(sk, &sk->sk_timer, jiffies + len); | |
306 | } | |
307 | ||
308 | EXPORT_SYMBOL(inet_csk_reset_keepalive_timer); | |
309 | ||
310 | struct dst_entry* inet_csk_route_req(struct sock *sk, | |
311 | const struct request_sock *req) | |
312 | { | |
313 | struct rtable *rt; | |
314 | const struct inet_request_sock *ireq = inet_rsk(req); | |
315 | struct ip_options *opt = inet_rsk(req)->opt; | |
316 | struct flowi fl = { .oif = sk->sk_bound_dev_if, | |
317 | .nl_u = { .ip4_u = | |
318 | { .daddr = ((opt && opt->srr) ? | |
319 | opt->faddr : | |
320 | ireq->rmt_addr), | |
321 | .saddr = ireq->loc_addr, | |
322 | .tos = RT_CONN_FLAGS(sk) } }, | |
323 | .proto = sk->sk_protocol, | |
324 | .uli_u = { .ports = | |
325 | { .sport = inet_sk(sk)->sport, | |
326 | .dport = ireq->rmt_port } } }; | |
327 | ||
4237c75c | 328 | security_req_classify_flow(req, &fl); |
3f421baa ACM |
329 | if (ip_route_output_flow(&rt, &fl, sk, 0)) { |
330 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
331 | return NULL; | |
332 | } | |
333 | if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) { | |
334 | ip_rt_put(rt); | |
335 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
336 | return NULL; | |
337 | } | |
338 | return &rt->u.dst; | |
339 | } | |
340 | ||
341 | EXPORT_SYMBOL_GPL(inet_csk_route_req); | |
342 | ||
6b72977b | 343 | static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport, |
72a3effa | 344 | const u32 rnd, const u32 synq_hsize) |
3f421baa | 345 | { |
6b72977b | 346 | return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1); |
3f421baa ACM |
347 | } |
348 | ||
349 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
350 | #define AF_INET_FAMILY(fam) ((fam) == AF_INET) | |
351 | #else | |
352 | #define AF_INET_FAMILY(fam) 1 | |
353 | #endif | |
354 | ||
355 | struct request_sock *inet_csk_search_req(const struct sock *sk, | |
356 | struct request_sock ***prevp, | |
6b72977b | 357 | const __be16 rport, const __be32 raddr, |
7f25afbb | 358 | const __be32 laddr) |
3f421baa ACM |
359 | { |
360 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
361 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
362 | struct request_sock *req, **prev; | |
363 | ||
364 | for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd, | |
365 | lopt->nr_table_entries)]; | |
366 | (req = *prev) != NULL; | |
367 | prev = &req->dl_next) { | |
368 | const struct inet_request_sock *ireq = inet_rsk(req); | |
369 | ||
370 | if (ireq->rmt_port == rport && | |
371 | ireq->rmt_addr == raddr && | |
372 | ireq->loc_addr == laddr && | |
373 | AF_INET_FAMILY(req->rsk_ops->family)) { | |
374 | BUG_TRAP(!req->sk); | |
375 | *prevp = prev; | |
376 | break; | |
377 | } | |
378 | } | |
379 | ||
380 | return req; | |
381 | } | |
382 | ||
383 | EXPORT_SYMBOL_GPL(inet_csk_search_req); | |
384 | ||
385 | void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req, | |
c2977c22 | 386 | unsigned long timeout) |
3f421baa ACM |
387 | { |
388 | struct inet_connection_sock *icsk = inet_csk(sk); | |
389 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; | |
390 | const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port, | |
391 | lopt->hash_rnd, lopt->nr_table_entries); | |
392 | ||
393 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); | |
394 | inet_csk_reqsk_queue_added(sk, timeout); | |
395 | } | |
396 | ||
a019d6fe ACM |
397 | /* Only thing we need from tcp.h */ |
398 | extern int sysctl_tcp_synack_retries; | |
399 | ||
3f421baa | 400 | EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add); |
9f1d2604 | 401 | |
a019d6fe ACM |
402 | void inet_csk_reqsk_queue_prune(struct sock *parent, |
403 | const unsigned long interval, | |
404 | const unsigned long timeout, | |
405 | const unsigned long max_rto) | |
406 | { | |
407 | struct inet_connection_sock *icsk = inet_csk(parent); | |
408 | struct request_sock_queue *queue = &icsk->icsk_accept_queue; | |
409 | struct listen_sock *lopt = queue->listen_opt; | |
410 | int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries; | |
411 | int thresh = max_retries; | |
412 | unsigned long now = jiffies; | |
413 | struct request_sock **reqp, *req; | |
414 | int i, budget; | |
415 | ||
416 | if (lopt == NULL || lopt->qlen == 0) | |
417 | return; | |
418 | ||
419 | /* Normally all the openreqs are young and become mature | |
420 | * (i.e. converted to established socket) for first timeout. | |
421 | * If synack was not acknowledged for 3 seconds, it means | |
422 | * one of the following things: synack was lost, ack was lost, | |
423 | * rtt is high or nobody planned to ack (i.e. synflood). | |
424 | * When server is a bit loaded, queue is populated with old | |
425 | * open requests, reducing effective size of queue. | |
426 | * When server is well loaded, queue size reduces to zero | |
427 | * after several minutes of work. It is not synflood, | |
428 | * it is normal operation. The solution is pruning | |
429 | * too old entries overriding normal timeout, when | |
430 | * situation becomes dangerous. | |
431 | * | |
432 | * Essentially, we reserve half of room for young | |
433 | * embrions; and abort old ones without pity, if old | |
434 | * ones are about to clog our table. | |
435 | */ | |
436 | if (lopt->qlen>>(lopt->max_qlen_log-1)) { | |
437 | int young = (lopt->qlen_young<<1); | |
438 | ||
439 | while (thresh > 2) { | |
440 | if (lopt->qlen < young) | |
441 | break; | |
442 | thresh--; | |
443 | young <<= 1; | |
444 | } | |
445 | } | |
446 | ||
447 | if (queue->rskq_defer_accept) | |
448 | max_retries = queue->rskq_defer_accept; | |
449 | ||
450 | budget = 2 * (lopt->nr_table_entries / (timeout / interval)); | |
451 | i = lopt->clock_hand; | |
452 | ||
453 | do { | |
454 | reqp=&lopt->syn_table[i]; | |
455 | while ((req = *reqp) != NULL) { | |
456 | if (time_after_eq(now, req->expires)) { | |
457 | if ((req->retrans < thresh || | |
458 | (inet_rsk(req)->acked && req->retrans < max_retries)) | |
459 | && !req->rsk_ops->rtx_syn_ack(parent, req, NULL)) { | |
460 | unsigned long timeo; | |
461 | ||
462 | if (req->retrans++ == 0) | |
463 | lopt->qlen_young--; | |
464 | timeo = min((timeout << req->retrans), max_rto); | |
465 | req->expires = now + timeo; | |
466 | reqp = &req->dl_next; | |
467 | continue; | |
468 | } | |
469 | ||
470 | /* Drop this request */ | |
471 | inet_csk_reqsk_queue_unlink(parent, req, reqp); | |
472 | reqsk_queue_removed(queue, req); | |
473 | reqsk_free(req); | |
474 | continue; | |
475 | } | |
476 | reqp = &req->dl_next; | |
477 | } | |
478 | ||
479 | i = (i + 1) & (lopt->nr_table_entries - 1); | |
480 | ||
481 | } while (--budget > 0); | |
482 | ||
483 | lopt->clock_hand = i; | |
484 | ||
485 | if (lopt->qlen) | |
486 | inet_csk_reset_keepalive_timer(parent, interval); | |
487 | } | |
488 | ||
489 | EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune); | |
490 | ||
9f1d2604 | 491 | struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req, |
dd0fc66f | 492 | const gfp_t priority) |
9f1d2604 ACM |
493 | { |
494 | struct sock *newsk = sk_clone(sk, priority); | |
495 | ||
496 | if (newsk != NULL) { | |
497 | struct inet_connection_sock *newicsk = inet_csk(newsk); | |
498 | ||
499 | newsk->sk_state = TCP_SYN_RECV; | |
500 | newicsk->icsk_bind_hash = NULL; | |
501 | ||
502 | inet_sk(newsk)->dport = inet_rsk(req)->rmt_port; | |
503 | newsk->sk_write_space = sk_stream_write_space; | |
504 | ||
505 | newicsk->icsk_retransmits = 0; | |
6687e988 ACM |
506 | newicsk->icsk_backoff = 0; |
507 | newicsk->icsk_probes_out = 0; | |
9f1d2604 ACM |
508 | |
509 | /* Deinitialize accept_queue to trap illegal accesses. */ | |
510 | memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue)); | |
4237c75c VY |
511 | |
512 | security_inet_csk_clone(newsk, req); | |
9f1d2604 ACM |
513 | } |
514 | return newsk; | |
515 | } | |
516 | ||
517 | EXPORT_SYMBOL_GPL(inet_csk_clone); | |
a019d6fe ACM |
518 | |
519 | /* | |
520 | * At this point, there should be no process reference to this | |
521 | * socket, and thus no user references at all. Therefore we | |
522 | * can assume the socket waitqueue is inactive and nobody will | |
523 | * try to jump onto it. | |
524 | */ | |
525 | void inet_csk_destroy_sock(struct sock *sk) | |
526 | { | |
527 | BUG_TRAP(sk->sk_state == TCP_CLOSE); | |
528 | BUG_TRAP(sock_flag(sk, SOCK_DEAD)); | |
529 | ||
530 | /* It cannot be in hash table! */ | |
531 | BUG_TRAP(sk_unhashed(sk)); | |
532 | ||
533 | /* If it has not 0 inet_sk(sk)->num, it must be bound */ | |
534 | BUG_TRAP(!inet_sk(sk)->num || inet_csk(sk)->icsk_bind_hash); | |
535 | ||
536 | sk->sk_prot->destroy(sk); | |
537 | ||
538 | sk_stream_kill_queues(sk); | |
539 | ||
540 | xfrm_sk_free_policy(sk); | |
541 | ||
542 | sk_refcnt_debug_release(sk); | |
543 | ||
544 | atomic_dec(sk->sk_prot->orphan_count); | |
545 | sock_put(sk); | |
546 | } | |
547 | ||
548 | EXPORT_SYMBOL(inet_csk_destroy_sock); | |
549 | ||
550 | int inet_csk_listen_start(struct sock *sk, const int nr_table_entries) | |
551 | { | |
552 | struct inet_sock *inet = inet_sk(sk); | |
553 | struct inet_connection_sock *icsk = inet_csk(sk); | |
554 | int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries); | |
555 | ||
556 | if (rc != 0) | |
557 | return rc; | |
558 | ||
559 | sk->sk_max_ack_backlog = 0; | |
560 | sk->sk_ack_backlog = 0; | |
561 | inet_csk_delack_init(sk); | |
562 | ||
563 | /* There is race window here: we announce ourselves listening, | |
564 | * but this transition is still not validated by get_port(). | |
565 | * It is OK, because this socket enters to hash table only | |
566 | * after validation is complete. | |
567 | */ | |
568 | sk->sk_state = TCP_LISTEN; | |
569 | if (!sk->sk_prot->get_port(sk, inet->num)) { | |
570 | inet->sport = htons(inet->num); | |
571 | ||
572 | sk_dst_reset(sk); | |
573 | sk->sk_prot->hash(sk); | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | sk->sk_state = TCP_CLOSE; | |
579 | __reqsk_queue_destroy(&icsk->icsk_accept_queue); | |
580 | return -EADDRINUSE; | |
581 | } | |
582 | ||
583 | EXPORT_SYMBOL_GPL(inet_csk_listen_start); | |
584 | ||
585 | /* | |
586 | * This routine closes sockets which have been at least partially | |
587 | * opened, but not yet accepted. | |
588 | */ | |
589 | void inet_csk_listen_stop(struct sock *sk) | |
590 | { | |
591 | struct inet_connection_sock *icsk = inet_csk(sk); | |
592 | struct request_sock *acc_req; | |
593 | struct request_sock *req; | |
594 | ||
595 | inet_csk_delete_keepalive_timer(sk); | |
596 | ||
597 | /* make all the listen_opt local to us */ | |
598 | acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue); | |
599 | ||
600 | /* Following specs, it would be better either to send FIN | |
601 | * (and enter FIN-WAIT-1, it is normal close) | |
602 | * or to send active reset (abort). | |
603 | * Certainly, it is pretty dangerous while synflood, but it is | |
604 | * bad justification for our negligence 8) | |
605 | * To be honest, we are not able to make either | |
606 | * of the variants now. --ANK | |
607 | */ | |
608 | reqsk_queue_destroy(&icsk->icsk_accept_queue); | |
609 | ||
610 | while ((req = acc_req) != NULL) { | |
611 | struct sock *child = req->sk; | |
612 | ||
613 | acc_req = req->dl_next; | |
614 | ||
615 | local_bh_disable(); | |
616 | bh_lock_sock(child); | |
617 | BUG_TRAP(!sock_owned_by_user(child)); | |
618 | sock_hold(child); | |
619 | ||
620 | sk->sk_prot->disconnect(child, O_NONBLOCK); | |
621 | ||
622 | sock_orphan(child); | |
623 | ||
624 | atomic_inc(sk->sk_prot->orphan_count); | |
625 | ||
626 | inet_csk_destroy_sock(child); | |
627 | ||
628 | bh_unlock_sock(child); | |
629 | local_bh_enable(); | |
630 | sock_put(child); | |
631 | ||
632 | sk_acceptq_removed(sk); | |
633 | __reqsk_free(req); | |
634 | } | |
635 | BUG_TRAP(!sk->sk_ack_backlog); | |
636 | } | |
637 | ||
638 | EXPORT_SYMBOL_GPL(inet_csk_listen_stop); | |
af05dc93 ACM |
639 | |
640 | void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) | |
641 | { | |
642 | struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; | |
643 | const struct inet_sock *inet = inet_sk(sk); | |
644 | ||
645 | sin->sin_family = AF_INET; | |
646 | sin->sin_addr.s_addr = inet->daddr; | |
647 | sin->sin_port = inet->dport; | |
648 | } | |
649 | ||
650 | EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr); | |
c4d93909 ACM |
651 | |
652 | int inet_csk_ctl_sock_create(struct socket **sock, unsigned short family, | |
653 | unsigned short type, unsigned char protocol) | |
654 | { | |
655 | int rc = sock_create_kern(family, type, protocol, sock); | |
656 | ||
657 | if (rc == 0) { | |
658 | (*sock)->sk->sk_allocation = GFP_ATOMIC; | |
659 | inet_sk((*sock)->sk)->uc_ttl = -1; | |
660 | /* | |
661 | * Unhash it so that IP input processing does not even see it, | |
662 | * we do not wish this socket to see incoming packets. | |
663 | */ | |
664 | (*sock)->sk->sk_prot->unhash((*sock)->sk); | |
665 | } | |
666 | return rc; | |
667 | } | |
668 | ||
669 | EXPORT_SYMBOL_GPL(inet_csk_ctl_sock_create); | |
dec73ff0 ACM |
670 | |
671 | #ifdef CONFIG_COMPAT | |
672 | int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname, | |
673 | char __user *optval, int __user *optlen) | |
674 | { | |
dbeff12b | 675 | const struct inet_connection_sock *icsk = inet_csk(sk); |
dec73ff0 ACM |
676 | |
677 | if (icsk->icsk_af_ops->compat_getsockopt != NULL) | |
678 | return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname, | |
679 | optval, optlen); | |
680 | return icsk->icsk_af_ops->getsockopt(sk, level, optname, | |
681 | optval, optlen); | |
682 | } | |
683 | ||
684 | EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt); | |
685 | ||
686 | int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname, | |
687 | char __user *optval, int optlen) | |
688 | { | |
dbeff12b | 689 | const struct inet_connection_sock *icsk = inet_csk(sk); |
dec73ff0 ACM |
690 | |
691 | if (icsk->icsk_af_ops->compat_setsockopt != NULL) | |
692 | return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname, | |
693 | optval, optlen); | |
694 | return icsk->icsk_af_ops->setsockopt(sk, level, optname, | |
695 | optval, optlen); | |
696 | } | |
697 | ||
698 | EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt); | |
699 | #endif |