8fb6ca23700aa8de4c446879b19186e626dfa396
[linux-2.6.git] / net / ipv4 / inet_connection_sock.c
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
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>
25 #include <net/xfrm.h>
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.
34  */
35 int sysctl_local_port_range[2] = { 32768, 61000 };
36 DEFINE_SEQLOCK(sysctl_port_range_lock);
37
38 void inet_get_local_port_range(int *low, int *high)
39 {
40         unsigned seq;
41         do {
42                 seq = read_seqbegin(&sysctl_port_range_lock);
43
44                 *low = sysctl_local_port_range[0];
45                 *high = sysctl_local_port_range[1];
46         } while (read_seqretry(&sysctl_port_range_lock, seq));
47 }
48 EXPORT_SYMBOL(inet_get_local_port_range);
49
50 int inet_csk_bind_conflict(const struct sock *sk,
51                            const struct inet_bind_bucket *tb)
52 {
53         const __be32 sk_rcv_saddr = inet_rcv_saddr(sk);
54         struct sock *sk2;
55         struct hlist_node *node;
56         int reuse = sk->sk_reuse;
57
58         sk_for_each_bound(sk2, node, &tb->owners) {
59                 if (sk != sk2 &&
60                     !inet_v6_ipv6only(sk2) &&
61                     (!sk->sk_bound_dev_if ||
62                      !sk2->sk_bound_dev_if ||
63                      sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
64                         if (!reuse || !sk2->sk_reuse ||
65                             sk2->sk_state == TCP_LISTEN) {
66                                 const __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
67                                 if (!sk2_rcv_saddr || !sk_rcv_saddr ||
68                                     sk2_rcv_saddr == sk_rcv_saddr)
69                                         break;
70                         }
71                 }
72         }
73         return node != NULL;
74 }
75
76 EXPORT_SYMBOL_GPL(inet_csk_bind_conflict);
77
78 /* Obtain a reference to a local port for the given sock,
79  * if snum is zero it means select any available local port.
80  */
81 int inet_csk_get_port(struct inet_hashinfo *hashinfo,
82                       struct sock *sk, unsigned short snum,
83                       int (*bind_conflict)(const struct sock *sk,
84                                            const struct inet_bind_bucket *tb))
85 {
86         struct inet_bind_hashbucket *head;
87         struct hlist_node *node;
88         struct inet_bind_bucket *tb;
89         int ret;
90
91         local_bh_disable();
92         if (!snum) {
93                 int remaining, rover, low, high;
94
95                 inet_get_local_port_range(&low, &high);
96                 remaining = (high - low) + 1;
97                 rover = net_random() % remaining + low;
98
99                 do {
100                         head = &hashinfo->bhash[inet_bhashfn(rover, hashinfo->bhash_size)];
101                         spin_lock(&head->lock);
102                         inet_bind_bucket_for_each(tb, node, &head->chain)
103                                 if (tb->port == rover)
104                                         goto next;
105                         break;
106                 next:
107                         spin_unlock(&head->lock);
108                         if (++rover > high)
109                                 rover = low;
110                 } while (--remaining > 0);
111
112                 /* Exhausted local port range during search?  It is not
113                  * possible for us to be holding one of the bind hash
114                  * locks if this test triggers, because if 'remaining'
115                  * drops to zero, we broke out of the do/while loop at
116                  * the top level, not from the 'break;' statement.
117                  */
118                 ret = 1;
119                 if (remaining <= 0)
120                         goto fail;
121
122                 /* OK, here is the one we will use.  HEAD is
123                  * non-NULL and we hold it's mutex.
124                  */
125                 snum = rover;
126         } else {
127                 head = &hashinfo->bhash[inet_bhashfn(snum, hashinfo->bhash_size)];
128                 spin_lock(&head->lock);
129                 inet_bind_bucket_for_each(tb, node, &head->chain)
130                         if (tb->port == snum)
131                                 goto tb_found;
132         }
133         tb = NULL;
134         goto tb_not_found;
135 tb_found:
136         if (!hlist_empty(&tb->owners)) {
137                 if (sk->sk_reuse > 1)
138                         goto success;
139                 if (tb->fastreuse > 0 &&
140                     sk->sk_reuse && sk->sk_state != TCP_LISTEN) {
141                         goto success;
142                 } else {
143                         ret = 1;
144                         if (bind_conflict(sk, tb))
145                                 goto fail_unlock;
146                 }
147         }
148 tb_not_found:
149         ret = 1;
150         if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, head, snum)) == NULL)
151                 goto fail_unlock;
152         if (hlist_empty(&tb->owners)) {
153                 if (sk->sk_reuse && sk->sk_state != TCP_LISTEN)
154                         tb->fastreuse = 1;
155                 else
156                         tb->fastreuse = 0;
157         } else if (tb->fastreuse &&
158                    (!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
159                 tb->fastreuse = 0;
160 success:
161         if (!inet_csk(sk)->icsk_bind_hash)
162                 inet_bind_hash(sk, tb, snum);
163         BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb);
164         ret = 0;
165
166 fail_unlock:
167         spin_unlock(&head->lock);
168 fail:
169         local_bh_enable();
170         return ret;
171 }
172
173 EXPORT_SYMBOL_GPL(inet_csk_get_port);
174
175 /*
176  * Wait for an incoming connection, avoid race conditions. This must be called
177  * with the socket locked.
178  */
179 static int inet_csk_wait_for_connect(struct sock *sk, long timeo)
180 {
181         struct inet_connection_sock *icsk = inet_csk(sk);
182         DEFINE_WAIT(wait);
183         int err;
184
185         /*
186          * True wake-one mechanism for incoming connections: only
187          * one process gets woken up, not the 'whole herd'.
188          * Since we do not 'race & poll' for established sockets
189          * anymore, the common case will execute the loop only once.
190          *
191          * Subtle issue: "add_wait_queue_exclusive()" will be added
192          * after any current non-exclusive waiters, and we know that
193          * it will always _stay_ after any new non-exclusive waiters
194          * because all non-exclusive waiters are added at the
195          * beginning of the wait-queue. As such, it's ok to "drop"
196          * our exclusiveness temporarily when we get woken up without
197          * having to remove and re-insert us on the wait queue.
198          */
199         for (;;) {
200                 prepare_to_wait_exclusive(sk->sk_sleep, &wait,
201                                           TASK_INTERRUPTIBLE);
202                 release_sock(sk);
203                 if (reqsk_queue_empty(&icsk->icsk_accept_queue))
204                         timeo = schedule_timeout(timeo);
205                 lock_sock(sk);
206                 err = 0;
207                 if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
208                         break;
209                 err = -EINVAL;
210                 if (sk->sk_state != TCP_LISTEN)
211                         break;
212                 err = sock_intr_errno(timeo);
213                 if (signal_pending(current))
214                         break;
215                 err = -EAGAIN;
216                 if (!timeo)
217                         break;
218         }
219         finish_wait(sk->sk_sleep, &wait);
220         return err;
221 }
222
223 /*
224  * This will accept the next outstanding connection.
225  */
226 struct sock *inet_csk_accept(struct sock *sk, int flags, int *err)
227 {
228         struct inet_connection_sock *icsk = inet_csk(sk);
229         struct sock *newsk;
230         int error;
231
232         lock_sock(sk);
233
234         /* We need to make sure that this socket is listening,
235          * and that it has something pending.
236          */
237         error = -EINVAL;
238         if (sk->sk_state != TCP_LISTEN)
239                 goto out_err;
240
241         /* Find already established connection */
242         if (reqsk_queue_empty(&icsk->icsk_accept_queue)) {
243                 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
244
245                 /* If this is a non blocking socket don't sleep */
246                 error = -EAGAIN;
247                 if (!timeo)
248                         goto out_err;
249
250                 error = inet_csk_wait_for_connect(sk, timeo);
251                 if (error)
252                         goto out_err;
253         }
254
255         newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk);
256         BUG_TRAP(newsk->sk_state != TCP_SYN_RECV);
257 out:
258         release_sock(sk);
259         return newsk;
260 out_err:
261         newsk = NULL;
262         *err = error;
263         goto out;
264 }
265
266 EXPORT_SYMBOL(inet_csk_accept);
267
268 /*
269  * Using different timers for retransmit, delayed acks and probes
270  * We may wish use just one timer maintaining a list of expire jiffies
271  * to optimize.
272  */
273 void inet_csk_init_xmit_timers(struct sock *sk,
274                                void (*retransmit_handler)(unsigned long),
275                                void (*delack_handler)(unsigned long),
276                                void (*keepalive_handler)(unsigned long))
277 {
278         struct inet_connection_sock *icsk = inet_csk(sk);
279
280         init_timer(&icsk->icsk_retransmit_timer);
281         init_timer(&icsk->icsk_delack_timer);
282         init_timer(&sk->sk_timer);
283
284         icsk->icsk_retransmit_timer.function = retransmit_handler;
285         icsk->icsk_delack_timer.function     = delack_handler;
286         sk->sk_timer.function                = keepalive_handler;
287
288         icsk->icsk_retransmit_timer.data =
289                 icsk->icsk_delack_timer.data =
290                         sk->sk_timer.data  = (unsigned long)sk;
291
292         icsk->icsk_pending = icsk->icsk_ack.pending = 0;
293 }
294
295 EXPORT_SYMBOL(inet_csk_init_xmit_timers);
296
297 void inet_csk_clear_xmit_timers(struct sock *sk)
298 {
299         struct inet_connection_sock *icsk = inet_csk(sk);
300
301         icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0;
302
303         sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
304         sk_stop_timer(sk, &icsk->icsk_delack_timer);
305         sk_stop_timer(sk, &sk->sk_timer);
306 }
307
308 EXPORT_SYMBOL(inet_csk_clear_xmit_timers);
309
310 void inet_csk_delete_keepalive_timer(struct sock *sk)
311 {
312         sk_stop_timer(sk, &sk->sk_timer);
313 }
314
315 EXPORT_SYMBOL(inet_csk_delete_keepalive_timer);
316
317 void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len)
318 {
319         sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
320 }
321
322 EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);
323
324 struct dst_entry* inet_csk_route_req(struct sock *sk,
325                                      const struct request_sock *req)
326 {
327         struct rtable *rt;
328         const struct inet_request_sock *ireq = inet_rsk(req);
329         struct ip_options *opt = inet_rsk(req)->opt;
330         struct flowi fl = { .oif = sk->sk_bound_dev_if,
331                             .nl_u = { .ip4_u =
332                                       { .daddr = ((opt && opt->srr) ?
333                                                   opt->faddr :
334                                                   ireq->rmt_addr),
335                                         .saddr = ireq->loc_addr,
336                                         .tos = RT_CONN_FLAGS(sk) } },
337                             .proto = sk->sk_protocol,
338                             .uli_u = { .ports =
339                                        { .sport = inet_sk(sk)->sport,
340                                          .dport = ireq->rmt_port } } };
341
342         security_req_classify_flow(req, &fl);
343         if (ip_route_output_flow(&rt, &fl, sk, 0)) {
344                 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
345                 return NULL;
346         }
347         if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) {
348                 ip_rt_put(rt);
349                 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
350                 return NULL;
351         }
352         return &rt->u.dst;
353 }
354
355 EXPORT_SYMBOL_GPL(inet_csk_route_req);
356
357 static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport,
358                                  const u32 rnd, const u32 synq_hsize)
359 {
360         return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1);
361 }
362
363 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
364 #define AF_INET_FAMILY(fam) ((fam) == AF_INET)
365 #else
366 #define AF_INET_FAMILY(fam) 1
367 #endif
368
369 struct request_sock *inet_csk_search_req(const struct sock *sk,
370                                          struct request_sock ***prevp,
371                                          const __be16 rport, const __be32 raddr,
372                                          const __be32 laddr)
373 {
374         const struct inet_connection_sock *icsk = inet_csk(sk);
375         struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
376         struct request_sock *req, **prev;
377
378         for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd,
379                                                     lopt->nr_table_entries)];
380              (req = *prev) != NULL;
381              prev = &req->dl_next) {
382                 const struct inet_request_sock *ireq = inet_rsk(req);
383
384                 if (ireq->rmt_port == rport &&
385                     ireq->rmt_addr == raddr &&
386                     ireq->loc_addr == laddr &&
387                     AF_INET_FAMILY(req->rsk_ops->family)) {
388                         BUG_TRAP(!req->sk);
389                         *prevp = prev;
390                         break;
391                 }
392         }
393
394         return req;
395 }
396
397 EXPORT_SYMBOL_GPL(inet_csk_search_req);
398
399 void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
400                                    unsigned long timeout)
401 {
402         struct inet_connection_sock *icsk = inet_csk(sk);
403         struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
404         const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port,
405                                      lopt->hash_rnd, lopt->nr_table_entries);
406
407         reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
408         inet_csk_reqsk_queue_added(sk, timeout);
409 }
410
411 /* Only thing we need from tcp.h */
412 extern int sysctl_tcp_synack_retries;
413
414 EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
415
416 void inet_csk_reqsk_queue_prune(struct sock *parent,
417                                 const unsigned long interval,
418                                 const unsigned long timeout,
419                                 const unsigned long max_rto)
420 {
421         struct inet_connection_sock *icsk = inet_csk(parent);
422         struct request_sock_queue *queue = &icsk->icsk_accept_queue;
423         struct listen_sock *lopt = queue->listen_opt;
424         int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries;
425         int thresh = max_retries;
426         unsigned long now = jiffies;
427         struct request_sock **reqp, *req;
428         int i, budget;
429
430         if (lopt == NULL || lopt->qlen == 0)
431                 return;
432
433         /* Normally all the openreqs are young and become mature
434          * (i.e. converted to established socket) for first timeout.
435          * If synack was not acknowledged for 3 seconds, it means
436          * one of the following things: synack was lost, ack was lost,
437          * rtt is high or nobody planned to ack (i.e. synflood).
438          * When server is a bit loaded, queue is populated with old
439          * open requests, reducing effective size of queue.
440          * When server is well loaded, queue size reduces to zero
441          * after several minutes of work. It is not synflood,
442          * it is normal operation. The solution is pruning
443          * too old entries overriding normal timeout, when
444          * situation becomes dangerous.
445          *
446          * Essentially, we reserve half of room for young
447          * embrions; and abort old ones without pity, if old
448          * ones are about to clog our table.
449          */
450         if (lopt->qlen>>(lopt->max_qlen_log-1)) {
451                 int young = (lopt->qlen_young<<1);
452
453                 while (thresh > 2) {
454                         if (lopt->qlen < young)
455                                 break;
456                         thresh--;
457                         young <<= 1;
458                 }
459         }
460
461         if (queue->rskq_defer_accept)
462                 max_retries = queue->rskq_defer_accept;
463
464         budget = 2 * (lopt->nr_table_entries / (timeout / interval));
465         i = lopt->clock_hand;
466
467         do {
468                 reqp=&lopt->syn_table[i];
469                 while ((req = *reqp) != NULL) {
470                         if (time_after_eq(now, req->expires)) {
471                                 if ((req->retrans < thresh ||
472                                      (inet_rsk(req)->acked && req->retrans < max_retries))
473                                     && !req->rsk_ops->rtx_syn_ack(parent, req, NULL)) {
474                                         unsigned long timeo;
475
476                                         if (req->retrans++ == 0)
477                                                 lopt->qlen_young--;
478                                         timeo = min((timeout << req->retrans), max_rto);
479                                         req->expires = now + timeo;
480                                         reqp = &req->dl_next;
481                                         continue;
482                                 }
483
484                                 /* Drop this request */
485                                 inet_csk_reqsk_queue_unlink(parent, req, reqp);
486                                 reqsk_queue_removed(queue, req);
487                                 reqsk_free(req);
488                                 continue;
489                         }
490                         reqp = &req->dl_next;
491                 }
492
493                 i = (i + 1) & (lopt->nr_table_entries - 1);
494
495         } while (--budget > 0);
496
497         lopt->clock_hand = i;
498
499         if (lopt->qlen)
500                 inet_csk_reset_keepalive_timer(parent, interval);
501 }
502
503 EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune);
504
505 struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req,
506                             const gfp_t priority)
507 {
508         struct sock *newsk = sk_clone(sk, priority);
509
510         if (newsk != NULL) {
511                 struct inet_connection_sock *newicsk = inet_csk(newsk);
512
513                 newsk->sk_state = TCP_SYN_RECV;
514                 newicsk->icsk_bind_hash = NULL;
515
516                 inet_sk(newsk)->dport = inet_rsk(req)->rmt_port;
517                 newsk->sk_write_space = sk_stream_write_space;
518
519                 newicsk->icsk_retransmits = 0;
520                 newicsk->icsk_backoff     = 0;
521                 newicsk->icsk_probes_out  = 0;
522
523                 /* Deinitialize accept_queue to trap illegal accesses. */
524                 memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
525
526                 security_inet_csk_clone(newsk, req);
527         }
528         return newsk;
529 }
530
531 EXPORT_SYMBOL_GPL(inet_csk_clone);
532
533 /*
534  * At this point, there should be no process reference to this
535  * socket, and thus no user references at all.  Therefore we
536  * can assume the socket waitqueue is inactive and nobody will
537  * try to jump onto it.
538  */
539 void inet_csk_destroy_sock(struct sock *sk)
540 {
541         BUG_TRAP(sk->sk_state == TCP_CLOSE);
542         BUG_TRAP(sock_flag(sk, SOCK_DEAD));
543
544         /* It cannot be in hash table! */
545         BUG_TRAP(sk_unhashed(sk));
546
547         /* If it has not 0 inet_sk(sk)->num, it must be bound */
548         BUG_TRAP(!inet_sk(sk)->num || inet_csk(sk)->icsk_bind_hash);
549
550         sk->sk_prot->destroy(sk);
551
552         sk_stream_kill_queues(sk);
553
554         xfrm_sk_free_policy(sk);
555
556         sk_refcnt_debug_release(sk);
557
558         atomic_dec(sk->sk_prot->orphan_count);
559         sock_put(sk);
560 }
561
562 EXPORT_SYMBOL(inet_csk_destroy_sock);
563
564 int inet_csk_listen_start(struct sock *sk, const int nr_table_entries)
565 {
566         struct inet_sock *inet = inet_sk(sk);
567         struct inet_connection_sock *icsk = inet_csk(sk);
568         int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries);
569
570         if (rc != 0)
571                 return rc;
572
573         sk->sk_max_ack_backlog = 0;
574         sk->sk_ack_backlog = 0;
575         inet_csk_delack_init(sk);
576
577         /* There is race window here: we announce ourselves listening,
578          * but this transition is still not validated by get_port().
579          * It is OK, because this socket enters to hash table only
580          * after validation is complete.
581          */
582         sk->sk_state = TCP_LISTEN;
583         if (!sk->sk_prot->get_port(sk, inet->num)) {
584                 inet->sport = htons(inet->num);
585
586                 sk_dst_reset(sk);
587                 sk->sk_prot->hash(sk);
588
589                 return 0;
590         }
591
592         sk->sk_state = TCP_CLOSE;
593         __reqsk_queue_destroy(&icsk->icsk_accept_queue);
594         return -EADDRINUSE;
595 }
596
597 EXPORT_SYMBOL_GPL(inet_csk_listen_start);
598
599 /*
600  *      This routine closes sockets which have been at least partially
601  *      opened, but not yet accepted.
602  */
603 void inet_csk_listen_stop(struct sock *sk)
604 {
605         struct inet_connection_sock *icsk = inet_csk(sk);
606         struct request_sock *acc_req;
607         struct request_sock *req;
608
609         inet_csk_delete_keepalive_timer(sk);
610
611         /* make all the listen_opt local to us */
612         acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue);
613
614         /* Following specs, it would be better either to send FIN
615          * (and enter FIN-WAIT-1, it is normal close)
616          * or to send active reset (abort).
617          * Certainly, it is pretty dangerous while synflood, but it is
618          * bad justification for our negligence 8)
619          * To be honest, we are not able to make either
620          * of the variants now.                 --ANK
621          */
622         reqsk_queue_destroy(&icsk->icsk_accept_queue);
623
624         while ((req = acc_req) != NULL) {
625                 struct sock *child = req->sk;
626
627                 acc_req = req->dl_next;
628
629                 local_bh_disable();
630                 bh_lock_sock(child);
631                 BUG_TRAP(!sock_owned_by_user(child));
632                 sock_hold(child);
633
634                 sk->sk_prot->disconnect(child, O_NONBLOCK);
635
636                 sock_orphan(child);
637
638                 atomic_inc(sk->sk_prot->orphan_count);
639
640                 inet_csk_destroy_sock(child);
641
642                 bh_unlock_sock(child);
643                 local_bh_enable();
644                 sock_put(child);
645
646                 sk_acceptq_removed(sk);
647                 __reqsk_free(req);
648         }
649         BUG_TRAP(!sk->sk_ack_backlog);
650 }
651
652 EXPORT_SYMBOL_GPL(inet_csk_listen_stop);
653
654 void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
655 {
656         struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
657         const struct inet_sock *inet = inet_sk(sk);
658
659         sin->sin_family         = AF_INET;
660         sin->sin_addr.s_addr    = inet->daddr;
661         sin->sin_port           = inet->dport;
662 }
663
664 EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr);
665
666 int inet_csk_ctl_sock_create(struct socket **sock, unsigned short family,
667                              unsigned short type, unsigned char protocol)
668 {
669         int rc = sock_create_kern(family, type, protocol, sock);
670
671         if (rc == 0) {
672                 (*sock)->sk->sk_allocation = GFP_ATOMIC;
673                 inet_sk((*sock)->sk)->uc_ttl = -1;
674                 /*
675                  * Unhash it so that IP input processing does not even see it,
676                  * we do not wish this socket to see incoming packets.
677                  */
678                 (*sock)->sk->sk_prot->unhash((*sock)->sk);
679         }
680         return rc;
681 }
682
683 EXPORT_SYMBOL_GPL(inet_csk_ctl_sock_create);
684
685 #ifdef CONFIG_COMPAT
686 int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
687                                char __user *optval, int __user *optlen)
688 {
689         const struct inet_connection_sock *icsk = inet_csk(sk);
690
691         if (icsk->icsk_af_ops->compat_getsockopt != NULL)
692                 return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname,
693                                                             optval, optlen);
694         return icsk->icsk_af_ops->getsockopt(sk, level, optname,
695                                              optval, optlen);
696 }
697
698 EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt);
699
700 int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
701                                char __user *optval, int optlen)
702 {
703         const struct inet_connection_sock *icsk = inet_csk(sk);
704
705         if (icsk->icsk_af_ops->compat_setsockopt != NULL)
706                 return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname,
707                                                             optval, optlen);
708         return icsk->icsk_af_ops->setsockopt(sk, level, optname,
709                                              optval, optlen);
710 }
711
712 EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt);
713 #endif