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1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth address family and sockets. */
26
27#include <linux/module.h>
28#include <linux/debugfs.h>
29#include <asm/ioctls.h>
30
31#include <net/bluetooth/bluetooth.h>
32#include <linux/proc_fs.h>
33
34#include "selftest.h"
35
36/* Bluetooth sockets */
37#define BT_MAX_PROTO 8
38static const struct net_proto_family *bt_proto[BT_MAX_PROTO];
39static DEFINE_RWLOCK(bt_proto_lock);
40
41static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
42static const char *const bt_key_strings[BT_MAX_PROTO] = {
43 "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
44 "sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
45 "sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
46 "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
47 "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
48 "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
49 "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
50 "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
51};
52
53static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
54static const char *const bt_slock_key_strings[BT_MAX_PROTO] = {
55 "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
56 "slock-AF_BLUETOOTH-BTPROTO_HCI",
57 "slock-AF_BLUETOOTH-BTPROTO_SCO",
58 "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
59 "slock-AF_BLUETOOTH-BTPROTO_BNEP",
60 "slock-AF_BLUETOOTH-BTPROTO_CMTP",
61 "slock-AF_BLUETOOTH-BTPROTO_HIDP",
62 "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
63};
64
65void bt_sock_reclassify_lock(struct sock *sk, int proto)
66{
67 BUG_ON(!sk);
68 BUG_ON(sock_owned_by_user(sk));
69
70 sock_lock_init_class_and_name(sk,
71 bt_slock_key_strings[proto], &bt_slock_key[proto],
72 bt_key_strings[proto], &bt_lock_key[proto]);
73}
74EXPORT_SYMBOL(bt_sock_reclassify_lock);
75
76int bt_sock_register(int proto, const struct net_proto_family *ops)
77{
78 int err = 0;
79
80 if (proto < 0 || proto >= BT_MAX_PROTO)
81 return -EINVAL;
82
83 write_lock(&bt_proto_lock);
84
85 if (bt_proto[proto])
86 err = -EEXIST;
87 else
88 bt_proto[proto] = ops;
89
90 write_unlock(&bt_proto_lock);
91
92 return err;
93}
94EXPORT_SYMBOL(bt_sock_register);
95
96void bt_sock_unregister(int proto)
97{
98 if (proto < 0 || proto >= BT_MAX_PROTO)
99 return;
100
101 write_lock(&bt_proto_lock);
102 bt_proto[proto] = NULL;
103 write_unlock(&bt_proto_lock);
104}
105EXPORT_SYMBOL(bt_sock_unregister);
106
107static int bt_sock_create(struct net *net, struct socket *sock, int proto,
108 int kern)
109{
110 int err;
111
112 if (net != &init_net)
113 return -EAFNOSUPPORT;
114
115 if (proto < 0 || proto >= BT_MAX_PROTO)
116 return -EINVAL;
117
118 if (!bt_proto[proto])
119 request_module("bt-proto-%d", proto);
120
121 err = -EPROTONOSUPPORT;
122
123 read_lock(&bt_proto_lock);
124
125 if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
126 err = bt_proto[proto]->create(net, sock, proto, kern);
127 if (!err)
128 bt_sock_reclassify_lock(sock->sk, proto);
129 module_put(bt_proto[proto]->owner);
130 }
131
132 read_unlock(&bt_proto_lock);
133
134 return err;
135}
136
137void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
138{
139 write_lock(&l->lock);
140 sk_add_node(sk, &l->head);
141 write_unlock(&l->lock);
142}
143EXPORT_SYMBOL(bt_sock_link);
144
145void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
146{
147 write_lock(&l->lock);
148 sk_del_node_init(sk);
149 write_unlock(&l->lock);
150}
151EXPORT_SYMBOL(bt_sock_unlink);
152
153void bt_accept_enqueue(struct sock *parent, struct sock *sk)
154{
155 BT_DBG("parent %p, sk %p", parent, sk);
156
157 sock_hold(sk);
158 list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
159 bt_sk(sk)->parent = parent;
160 parent->sk_ack_backlog++;
161}
162EXPORT_SYMBOL(bt_accept_enqueue);
163
164void bt_accept_unlink(struct sock *sk)
165{
166 BT_DBG("sk %p state %d", sk, sk->sk_state);
167
168 list_del_init(&bt_sk(sk)->accept_q);
169 bt_sk(sk)->parent->sk_ack_backlog--;
170 bt_sk(sk)->parent = NULL;
171 sock_put(sk);
172}
173EXPORT_SYMBOL(bt_accept_unlink);
174
175struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
176{
177 struct bt_sock *s, *n;
178 struct sock *sk;
179
180 BT_DBG("parent %p", parent);
181
182 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
183 sk = (struct sock *)s;
184
185 lock_sock(sk);
186
187 /* FIXME: Is this check still needed */
188 if (sk->sk_state == BT_CLOSED) {
189 bt_accept_unlink(sk);
190 release_sock(sk);
191 continue;
192 }
193
194 if (sk->sk_state == BT_CONNECTED || !newsock ||
195 test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) {
196 bt_accept_unlink(sk);
197 if (newsock)
198 sock_graft(sk, newsock);
199
200 release_sock(sk);
201 return sk;
202 }
203
204 release_sock(sk);
205 }
206
207 return NULL;
208}
209EXPORT_SYMBOL(bt_accept_dequeue);
210
211int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
212 int flags)
213{
214 int noblock = flags & MSG_DONTWAIT;
215 struct sock *sk = sock->sk;
216 struct sk_buff *skb;
217 size_t copied;
218 int err;
219
220 BT_DBG("sock %p sk %p len %zu", sock, sk, len);
221
222 if (flags & MSG_OOB)
223 return -EOPNOTSUPP;
224
225 skb = skb_recv_datagram(sk, flags, noblock, &err);
226 if (!skb) {
227 if (sk->sk_shutdown & RCV_SHUTDOWN)
228 return 0;
229
230 return err;
231 }
232
233 copied = skb->len;
234 if (len < copied) {
235 msg->msg_flags |= MSG_TRUNC;
236 copied = len;
237 }
238
239 skb_reset_transport_header(skb);
240 err = skb_copy_datagram_msg(skb, 0, msg, copied);
241 if (err == 0) {
242 sock_recv_ts_and_drops(msg, sk, skb);
243
244 if (bt_sk(sk)->skb_msg_name)
245 bt_sk(sk)->skb_msg_name(skb, msg->msg_name,
246 &msg->msg_namelen);
247 }
248
249 skb_free_datagram(sk, skb);
250
251 return err ? : copied;
252}
253EXPORT_SYMBOL(bt_sock_recvmsg);
254
255static long bt_sock_data_wait(struct sock *sk, long timeo)
256{
257 DECLARE_WAITQUEUE(wait, current);
258
259 add_wait_queue(sk_sleep(sk), &wait);
260 for (;;) {
261 set_current_state(TASK_INTERRUPTIBLE);
262
263 if (!skb_queue_empty(&sk->sk_receive_queue))
264 break;
265
266 if (sk->sk_err || (sk->sk_shutdown & RCV_SHUTDOWN))
267 break;
268
269 if (signal_pending(current) || !timeo)
270 break;
271
272 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
273 release_sock(sk);
274 timeo = schedule_timeout(timeo);
275 lock_sock(sk);
276 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
277 }
278
279 __set_current_state(TASK_RUNNING);
280 remove_wait_queue(sk_sleep(sk), &wait);
281 return timeo;
282}
283
284int bt_sock_stream_recvmsg(struct socket *sock, struct msghdr *msg,
285 size_t size, int flags)
286{
287 struct sock *sk = sock->sk;
288 int err = 0;
289 size_t target, copied = 0;
290 long timeo;
291
292 if (flags & MSG_OOB)
293 return -EOPNOTSUPP;
294
295 BT_DBG("sk %p size %zu", sk, size);
296
297 lock_sock(sk);
298
299 target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
300 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
301
302 do {
303 struct sk_buff *skb;
304 int chunk;
305
306 skb = skb_dequeue(&sk->sk_receive_queue);
307 if (!skb) {
308 if (copied >= target)
309 break;
310
311 err = sock_error(sk);
312 if (err)
313 break;
314 if (sk->sk_shutdown & RCV_SHUTDOWN)
315 break;
316
317 err = -EAGAIN;
318 if (!timeo)
319 break;
320
321 timeo = bt_sock_data_wait(sk, timeo);
322
323 if (signal_pending(current)) {
324 err = sock_intr_errno(timeo);
325 goto out;
326 }
327 continue;
328 }
329
330 chunk = min_t(unsigned int, skb->len, size);
331 if (skb_copy_datagram_msg(skb, 0, msg, chunk)) {
332 skb_queue_head(&sk->sk_receive_queue, skb);
333 if (!copied)
334 copied = -EFAULT;
335 break;
336 }
337 copied += chunk;
338 size -= chunk;
339
340 sock_recv_ts_and_drops(msg, sk, skb);
341
342 if (!(flags & MSG_PEEK)) {
343 int skb_len = skb_headlen(skb);
344
345 if (chunk <= skb_len) {
346 __skb_pull(skb, chunk);
347 } else {
348 struct sk_buff *frag;
349
350 __skb_pull(skb, skb_len);
351 chunk -= skb_len;
352
353 skb_walk_frags(skb, frag) {
354 if (chunk <= frag->len) {
355 /* Pulling partial data */
356 skb->len -= chunk;
357 skb->data_len -= chunk;
358 __skb_pull(frag, chunk);
359 break;
360 } else if (frag->len) {
361 /* Pulling all frag data */
362 chunk -= frag->len;
363 skb->len -= frag->len;
364 skb->data_len -= frag->len;
365 __skb_pull(frag, frag->len);
366 }
367 }
368 }
369
370 if (skb->len) {
371 skb_queue_head(&sk->sk_receive_queue, skb);
372 break;
373 }
374 kfree_skb(skb);
375
376 } else {
377 /* put message back and return */
378 skb_queue_head(&sk->sk_receive_queue, skb);
379 break;
380 }
381 } while (size);
382
383out:
384 release_sock(sk);
385 return copied ? : err;
386}
387EXPORT_SYMBOL(bt_sock_stream_recvmsg);
388
389static inline unsigned int bt_accept_poll(struct sock *parent)
390{
391 struct bt_sock *s, *n;
392 struct sock *sk;
393
394 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
395 sk = (struct sock *)s;
396 if (sk->sk_state == BT_CONNECTED ||
397 (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags) &&
398 sk->sk_state == BT_CONNECT2))
399 return POLLIN | POLLRDNORM;
400 }
401
402 return 0;
403}
404
405unsigned int bt_sock_poll(struct file *file, struct socket *sock,
406 poll_table *wait)
407{
408 struct sock *sk = sock->sk;
409 unsigned int mask = 0;
410
411 BT_DBG("sock %p, sk %p", sock, sk);
412
413 poll_wait(file, sk_sleep(sk), wait);
414
415 if (sk->sk_state == BT_LISTEN)
416 return bt_accept_poll(sk);
417
418 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
419 mask |= POLLERR |
420 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
421
422 if (sk->sk_shutdown & RCV_SHUTDOWN)
423 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
424
425 if (sk->sk_shutdown == SHUTDOWN_MASK)
426 mask |= POLLHUP;
427
428 if (!skb_queue_empty(&sk->sk_receive_queue))
429 mask |= POLLIN | POLLRDNORM;
430
431 if (sk->sk_state == BT_CLOSED)
432 mask |= POLLHUP;
433
434 if (sk->sk_state == BT_CONNECT ||
435 sk->sk_state == BT_CONNECT2 ||
436 sk->sk_state == BT_CONFIG)
437 return mask;
438
439 if (!test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags) && sock_writeable(sk))
440 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
441 else
442 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
443
444 return mask;
445}
446EXPORT_SYMBOL(bt_sock_poll);
447
448int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
449{
450 struct sock *sk = sock->sk;
451 struct sk_buff *skb;
452 long amount;
453 int err;
454
455 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
456
457 switch (cmd) {
458 case TIOCOUTQ:
459 if (sk->sk_state == BT_LISTEN)
460 return -EINVAL;
461
462 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
463 if (amount < 0)
464 amount = 0;
465 err = put_user(amount, (int __user *) arg);
466 break;
467
468 case TIOCINQ:
469 if (sk->sk_state == BT_LISTEN)
470 return -EINVAL;
471
472 lock_sock(sk);
473 skb = skb_peek(&sk->sk_receive_queue);
474 amount = skb ? skb->len : 0;
475 release_sock(sk);
476 err = put_user(amount, (int __user *) arg);
477 break;
478
479 case SIOCGSTAMP:
480 err = sock_get_timestamp(sk, (struct timeval __user *) arg);
481 break;
482
483 case SIOCGSTAMPNS:
484 err = sock_get_timestampns(sk, (struct timespec __user *) arg);
485 break;
486
487 default:
488 err = -ENOIOCTLCMD;
489 break;
490 }
491
492 return err;
493}
494EXPORT_SYMBOL(bt_sock_ioctl);
495
496/* This function expects the sk lock to be held when called */
497int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
498{
499 DECLARE_WAITQUEUE(wait, current);
500 int err = 0;
501
502 BT_DBG("sk %p", sk);
503
504 add_wait_queue(sk_sleep(sk), &wait);
505 set_current_state(TASK_INTERRUPTIBLE);
506 while (sk->sk_state != state) {
507 if (!timeo) {
508 err = -EINPROGRESS;
509 break;
510 }
511
512 if (signal_pending(current)) {
513 err = sock_intr_errno(timeo);
514 break;
515 }
516
517 release_sock(sk);
518 timeo = schedule_timeout(timeo);
519 lock_sock(sk);
520 set_current_state(TASK_INTERRUPTIBLE);
521
522 err = sock_error(sk);
523 if (err)
524 break;
525 }
526 __set_current_state(TASK_RUNNING);
527 remove_wait_queue(sk_sleep(sk), &wait);
528 return err;
529}
530EXPORT_SYMBOL(bt_sock_wait_state);
531
532/* This function expects the sk lock to be held when called */
533int bt_sock_wait_ready(struct sock *sk, unsigned long flags)
534{
535 DECLARE_WAITQUEUE(wait, current);
536 unsigned long timeo;
537 int err = 0;
538
539 BT_DBG("sk %p", sk);
540
541 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
542
543 add_wait_queue(sk_sleep(sk), &wait);
544 set_current_state(TASK_INTERRUPTIBLE);
545 while (test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags)) {
546 if (!timeo) {
547 err = -EAGAIN;
548 break;
549 }
550
551 if (signal_pending(current)) {
552 err = sock_intr_errno(timeo);
553 break;
554 }
555
556 release_sock(sk);
557 timeo = schedule_timeout(timeo);
558 lock_sock(sk);
559 set_current_state(TASK_INTERRUPTIBLE);
560
561 err = sock_error(sk);
562 if (err)
563 break;
564 }
565 __set_current_state(TASK_RUNNING);
566 remove_wait_queue(sk_sleep(sk), &wait);
567
568 return err;
569}
570EXPORT_SYMBOL(bt_sock_wait_ready);
571
572#ifdef CONFIG_PROC_FS
573struct bt_seq_state {
574 struct bt_sock_list *l;
575};
576
577static void *bt_seq_start(struct seq_file *seq, loff_t *pos)
578 __acquires(seq->private->l->lock)
579{
580 struct bt_seq_state *s = seq->private;
581 struct bt_sock_list *l = s->l;
582
583 read_lock(&l->lock);
584 return seq_hlist_start_head(&l->head, *pos);
585}
586
587static void *bt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
588{
589 struct bt_seq_state *s = seq->private;
590 struct bt_sock_list *l = s->l;
591
592 return seq_hlist_next(v, &l->head, pos);
593}
594
595static void bt_seq_stop(struct seq_file *seq, void *v)
596 __releases(seq->private->l->lock)
597{
598 struct bt_seq_state *s = seq->private;
599 struct bt_sock_list *l = s->l;
600
601 read_unlock(&l->lock);
602}
603
604static int bt_seq_show(struct seq_file *seq, void *v)
605{
606 struct bt_seq_state *s = seq->private;
607 struct bt_sock_list *l = s->l;
608
609 if (v == SEQ_START_TOKEN) {
610 seq_puts(seq ,"sk RefCnt Rmem Wmem User Inode Parent");
611
612 if (l->custom_seq_show) {
613 seq_putc(seq, ' ');
614 l->custom_seq_show(seq, v);
615 }
616
617 seq_putc(seq, '\n');
618 } else {
619 struct sock *sk = sk_entry(v);
620 struct bt_sock *bt = bt_sk(sk);
621
622 seq_printf(seq,
623 "%pK %-6d %-6u %-6u %-6u %-6lu %-6lu",
624 sk,
625 atomic_read(&sk->sk_refcnt),
626 sk_rmem_alloc_get(sk),
627 sk_wmem_alloc_get(sk),
628 from_kuid(seq_user_ns(seq), sock_i_uid(sk)),
629 sock_i_ino(sk),
630 bt->parent? sock_i_ino(bt->parent): 0LU);
631
632 if (l->custom_seq_show) {
633 seq_putc(seq, ' ');
634 l->custom_seq_show(seq, v);
635 }
636
637 seq_putc(seq, '\n');
638 }
639 return 0;
640}
641
642static const struct seq_operations bt_seq_ops = {
643 .start = bt_seq_start,
644 .next = bt_seq_next,
645 .stop = bt_seq_stop,
646 .show = bt_seq_show,
647};
648
649static int bt_seq_open(struct inode *inode, struct file *file)
650{
651 struct bt_sock_list *sk_list;
652 struct bt_seq_state *s;
653
654 sk_list = PDE_DATA(inode);
655 s = __seq_open_private(file, &bt_seq_ops,
656 sizeof(struct bt_seq_state));
657 if (!s)
658 return -ENOMEM;
659
660 s->l = sk_list;
661 return 0;
662}
663
664static const struct file_operations bt_fops = {
665 .open = bt_seq_open,
666 .read = seq_read,
667 .llseek = seq_lseek,
668 .release = seq_release_private
669};
670
671int bt_procfs_init(struct net *net, const char *name,
672 struct bt_sock_list *sk_list,
673 int (* seq_show)(struct seq_file *, void *))
674{
675 sk_list->custom_seq_show = seq_show;
676
677 if (!proc_create_data(name, 0, net->proc_net, &bt_fops, sk_list))
678 return -ENOMEM;
679 return 0;
680}
681
682void bt_procfs_cleanup(struct net *net, const char *name)
683{
684 remove_proc_entry(name, net->proc_net);
685}
686#else
687int bt_procfs_init(struct net *net, const char *name,
688 struct bt_sock_list *sk_list,
689 int (* seq_show)(struct seq_file *, void *))
690{
691 return 0;
692}
693
694void bt_procfs_cleanup(struct net *net, const char *name)
695{
696}
697#endif
698EXPORT_SYMBOL(bt_procfs_init);
699EXPORT_SYMBOL(bt_procfs_cleanup);
700
701static struct net_proto_family bt_sock_family_ops = {
702 .owner = THIS_MODULE,
703 .family = PF_BLUETOOTH,
704 .create = bt_sock_create,
705};
706
707struct dentry *bt_debugfs;
708EXPORT_SYMBOL_GPL(bt_debugfs);
709
710static int __init bt_init(void)
711{
712 int err;
713
714 sock_skb_cb_check_size(sizeof(struct bt_skb_cb));
715
716 BT_INFO("Core ver %s", BT_SUBSYS_VERSION);
717
718 err = bt_selftest();
719 if (err < 0)
720 return err;
721
722 bt_debugfs = debugfs_create_dir("bluetooth", NULL);
723
724 err = bt_sysfs_init();
725 if (err < 0)
726 return err;
727
728 err = sock_register(&bt_sock_family_ops);
729 if (err < 0) {
730 bt_sysfs_cleanup();
731 return err;
732 }
733
734 BT_INFO("HCI device and connection manager initialized");
735
736 err = hci_sock_init();
737 if (err < 0)
738 goto error;
739
740 err = l2cap_init();
741 if (err < 0)
742 goto sock_err;
743
744 err = sco_init();
745 if (err < 0) {
746 l2cap_exit();
747 goto sock_err;
748 }
749
750 err = mgmt_init();
751 if (err < 0) {
752 sco_exit();
753 l2cap_exit();
754 goto sock_err;
755 }
756
757 return 0;
758
759sock_err:
760 hci_sock_cleanup();
761
762error:
763 sock_unregister(PF_BLUETOOTH);
764 bt_sysfs_cleanup();
765
766 return err;
767}
768
769static void __exit bt_exit(void)
770{
771 mgmt_exit();
772
773 sco_exit();
774
775 l2cap_exit();
776
777 hci_sock_cleanup();
778
779 sock_unregister(PF_BLUETOOTH);
780
781 bt_sysfs_cleanup();
782
783 debugfs_remove_recursive(bt_debugfs);
784}
785
786subsys_initcall(bt_init);
787module_exit(bt_exit);
788
789MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
790MODULE_DESCRIPTION("Bluetooth Core ver " BT_SUBSYS_VERSION);
791MODULE_VERSION(BT_SUBSYS_VERSION);
792MODULE_LICENSE("GPL");
793MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);
1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth address family and sockets. */
26
27#include <linux/module.h>
28
29#include <linux/types.h>
30#include <linux/list.h>
31#include <linux/errno.h>
32#include <linux/kernel.h>
33#include <linux/sched.h>
34#include <linux/skbuff.h>
35#include <linux/init.h>
36#include <linux/poll.h>
37#include <net/sock.h>
38#include <asm/ioctls.h>
39#include <linux/kmod.h>
40
41#include <net/bluetooth/bluetooth.h>
42
43#define VERSION "2.16"
44
45/* Bluetooth sockets */
46#define BT_MAX_PROTO 8
47static const struct net_proto_family *bt_proto[BT_MAX_PROTO];
48static DEFINE_RWLOCK(bt_proto_lock);
49
50static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
51static const char *const bt_key_strings[BT_MAX_PROTO] = {
52 "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
53 "sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
54 "sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
55 "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
56 "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
57 "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
58 "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
59 "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
60};
61
62static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
63static const char *const bt_slock_key_strings[BT_MAX_PROTO] = {
64 "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
65 "slock-AF_BLUETOOTH-BTPROTO_HCI",
66 "slock-AF_BLUETOOTH-BTPROTO_SCO",
67 "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
68 "slock-AF_BLUETOOTH-BTPROTO_BNEP",
69 "slock-AF_BLUETOOTH-BTPROTO_CMTP",
70 "slock-AF_BLUETOOTH-BTPROTO_HIDP",
71 "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
72};
73
74static inline void bt_sock_reclassify_lock(struct socket *sock, int proto)
75{
76 struct sock *sk = sock->sk;
77
78 if (!sk)
79 return;
80
81 BUG_ON(sock_owned_by_user(sk));
82
83 sock_lock_init_class_and_name(sk,
84 bt_slock_key_strings[proto], &bt_slock_key[proto],
85 bt_key_strings[proto], &bt_lock_key[proto]);
86}
87
88int bt_sock_register(int proto, const struct net_proto_family *ops)
89{
90 int err = 0;
91
92 if (proto < 0 || proto >= BT_MAX_PROTO)
93 return -EINVAL;
94
95 write_lock(&bt_proto_lock);
96
97 if (bt_proto[proto])
98 err = -EEXIST;
99 else
100 bt_proto[proto] = ops;
101
102 write_unlock(&bt_proto_lock);
103
104 return err;
105}
106EXPORT_SYMBOL(bt_sock_register);
107
108int bt_sock_unregister(int proto)
109{
110 int err = 0;
111
112 if (proto < 0 || proto >= BT_MAX_PROTO)
113 return -EINVAL;
114
115 write_lock(&bt_proto_lock);
116
117 if (!bt_proto[proto])
118 err = -ENOENT;
119 else
120 bt_proto[proto] = NULL;
121
122 write_unlock(&bt_proto_lock);
123
124 return err;
125}
126EXPORT_SYMBOL(bt_sock_unregister);
127
128static int bt_sock_create(struct net *net, struct socket *sock, int proto,
129 int kern)
130{
131 int err;
132
133 if (net != &init_net)
134 return -EAFNOSUPPORT;
135
136 if (proto < 0 || proto >= BT_MAX_PROTO)
137 return -EINVAL;
138
139 if (!bt_proto[proto])
140 request_module("bt-proto-%d", proto);
141
142 err = -EPROTONOSUPPORT;
143
144 read_lock(&bt_proto_lock);
145
146 if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
147 err = bt_proto[proto]->create(net, sock, proto, kern);
148 bt_sock_reclassify_lock(sock, proto);
149 module_put(bt_proto[proto]->owner);
150 }
151
152 read_unlock(&bt_proto_lock);
153
154 return err;
155}
156
157void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
158{
159 write_lock_bh(&l->lock);
160 sk_add_node(sk, &l->head);
161 write_unlock_bh(&l->lock);
162}
163EXPORT_SYMBOL(bt_sock_link);
164
165void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
166{
167 write_lock_bh(&l->lock);
168 sk_del_node_init(sk);
169 write_unlock_bh(&l->lock);
170}
171EXPORT_SYMBOL(bt_sock_unlink);
172
173void bt_accept_enqueue(struct sock *parent, struct sock *sk)
174{
175 BT_DBG("parent %p, sk %p", parent, sk);
176
177 sock_hold(sk);
178 list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
179 bt_sk(sk)->parent = parent;
180 parent->sk_ack_backlog++;
181}
182EXPORT_SYMBOL(bt_accept_enqueue);
183
184void bt_accept_unlink(struct sock *sk)
185{
186 BT_DBG("sk %p state %d", sk, sk->sk_state);
187
188 list_del_init(&bt_sk(sk)->accept_q);
189 bt_sk(sk)->parent->sk_ack_backlog--;
190 bt_sk(sk)->parent = NULL;
191 sock_put(sk);
192}
193EXPORT_SYMBOL(bt_accept_unlink);
194
195struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
196{
197 struct list_head *p, *n;
198 struct sock *sk;
199
200 BT_DBG("parent %p", parent);
201
202 local_bh_disable();
203 list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
204 sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
205
206 bh_lock_sock(sk);
207
208 /* FIXME: Is this check still needed */
209 if (sk->sk_state == BT_CLOSED) {
210 bh_unlock_sock(sk);
211 bt_accept_unlink(sk);
212 continue;
213 }
214
215 if (sk->sk_state == BT_CONNECTED || !newsock ||
216 bt_sk(parent)->defer_setup) {
217 bt_accept_unlink(sk);
218 if (newsock)
219 sock_graft(sk, newsock);
220
221 bh_unlock_sock(sk);
222 local_bh_enable();
223 return sk;
224 }
225
226 bh_unlock_sock(sk);
227 }
228 local_bh_enable();
229
230 return NULL;
231}
232EXPORT_SYMBOL(bt_accept_dequeue);
233
234int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
235 struct msghdr *msg, size_t len, int flags)
236{
237 int noblock = flags & MSG_DONTWAIT;
238 struct sock *sk = sock->sk;
239 struct sk_buff *skb;
240 size_t copied;
241 int err;
242
243 BT_DBG("sock %p sk %p len %zu", sock, sk, len);
244
245 if (flags & (MSG_OOB))
246 return -EOPNOTSUPP;
247
248 skb = skb_recv_datagram(sk, flags, noblock, &err);
249 if (!skb) {
250 if (sk->sk_shutdown & RCV_SHUTDOWN)
251 return 0;
252 return err;
253 }
254
255 msg->msg_namelen = 0;
256
257 copied = skb->len;
258 if (len < copied) {
259 msg->msg_flags |= MSG_TRUNC;
260 copied = len;
261 }
262
263 skb_reset_transport_header(skb);
264 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
265 if (err == 0)
266 sock_recv_ts_and_drops(msg, sk, skb);
267
268 skb_free_datagram(sk, skb);
269
270 return err ? : copied;
271}
272EXPORT_SYMBOL(bt_sock_recvmsg);
273
274static long bt_sock_data_wait(struct sock *sk, long timeo)
275{
276 DECLARE_WAITQUEUE(wait, current);
277
278 add_wait_queue(sk_sleep(sk), &wait);
279 for (;;) {
280 set_current_state(TASK_INTERRUPTIBLE);
281
282 if (!skb_queue_empty(&sk->sk_receive_queue))
283 break;
284
285 if (sk->sk_err || (sk->sk_shutdown & RCV_SHUTDOWN))
286 break;
287
288 if (signal_pending(current) || !timeo)
289 break;
290
291 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
292 release_sock(sk);
293 timeo = schedule_timeout(timeo);
294 lock_sock(sk);
295 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
296 }
297
298 __set_current_state(TASK_RUNNING);
299 remove_wait_queue(sk_sleep(sk), &wait);
300 return timeo;
301}
302
303int bt_sock_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
304 struct msghdr *msg, size_t size, int flags)
305{
306 struct sock *sk = sock->sk;
307 int err = 0;
308 size_t target, copied = 0;
309 long timeo;
310
311 if (flags & MSG_OOB)
312 return -EOPNOTSUPP;
313
314 msg->msg_namelen = 0;
315
316 BT_DBG("sk %p size %zu", sk, size);
317
318 lock_sock(sk);
319
320 target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
321 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
322
323 do {
324 struct sk_buff *skb;
325 int chunk;
326
327 skb = skb_dequeue(&sk->sk_receive_queue);
328 if (!skb) {
329 if (copied >= target)
330 break;
331
332 err = sock_error(sk);
333 if (err)
334 break;
335 if (sk->sk_shutdown & RCV_SHUTDOWN)
336 break;
337
338 err = -EAGAIN;
339 if (!timeo)
340 break;
341
342 timeo = bt_sock_data_wait(sk, timeo);
343
344 if (signal_pending(current)) {
345 err = sock_intr_errno(timeo);
346 goto out;
347 }
348 continue;
349 }
350
351 chunk = min_t(unsigned int, skb->len, size);
352 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
353 skb_queue_head(&sk->sk_receive_queue, skb);
354 if (!copied)
355 copied = -EFAULT;
356 break;
357 }
358 copied += chunk;
359 size -= chunk;
360
361 sock_recv_ts_and_drops(msg, sk, skb);
362
363 if (!(flags & MSG_PEEK)) {
364 skb_pull(skb, chunk);
365 if (skb->len) {
366 skb_queue_head(&sk->sk_receive_queue, skb);
367 break;
368 }
369 kfree_skb(skb);
370
371 } else {
372 /* put message back and return */
373 skb_queue_head(&sk->sk_receive_queue, skb);
374 break;
375 }
376 } while (size);
377
378out:
379 release_sock(sk);
380 return copied ? : err;
381}
382EXPORT_SYMBOL(bt_sock_stream_recvmsg);
383
384static inline unsigned int bt_accept_poll(struct sock *parent)
385{
386 struct list_head *p, *n;
387 struct sock *sk;
388
389 list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
390 sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
391 if (sk->sk_state == BT_CONNECTED ||
392 (bt_sk(parent)->defer_setup &&
393 sk->sk_state == BT_CONNECT2))
394 return POLLIN | POLLRDNORM;
395 }
396
397 return 0;
398}
399
400unsigned int bt_sock_poll(struct file *file, struct socket *sock, poll_table *wait)
401{
402 struct sock *sk = sock->sk;
403 unsigned int mask = 0;
404
405 BT_DBG("sock %p, sk %p", sock, sk);
406
407 poll_wait(file, sk_sleep(sk), wait);
408
409 if (sk->sk_state == BT_LISTEN)
410 return bt_accept_poll(sk);
411
412 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
413 mask |= POLLERR;
414
415 if (sk->sk_shutdown & RCV_SHUTDOWN)
416 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
417
418 if (sk->sk_shutdown == SHUTDOWN_MASK)
419 mask |= POLLHUP;
420
421 if (!skb_queue_empty(&sk->sk_receive_queue))
422 mask |= POLLIN | POLLRDNORM;
423
424 if (sk->sk_state == BT_CLOSED)
425 mask |= POLLHUP;
426
427 if (sk->sk_state == BT_CONNECT ||
428 sk->sk_state == BT_CONNECT2 ||
429 sk->sk_state == BT_CONFIG)
430 return mask;
431
432 if (sock_writeable(sk))
433 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
434 else
435 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
436
437 return mask;
438}
439EXPORT_SYMBOL(bt_sock_poll);
440
441int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
442{
443 struct sock *sk = sock->sk;
444 struct sk_buff *skb;
445 long amount;
446 int err;
447
448 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
449
450 switch (cmd) {
451 case TIOCOUTQ:
452 if (sk->sk_state == BT_LISTEN)
453 return -EINVAL;
454
455 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
456 if (amount < 0)
457 amount = 0;
458 err = put_user(amount, (int __user *) arg);
459 break;
460
461 case TIOCINQ:
462 if (sk->sk_state == BT_LISTEN)
463 return -EINVAL;
464
465 lock_sock(sk);
466 skb = skb_peek(&sk->sk_receive_queue);
467 amount = skb ? skb->len : 0;
468 release_sock(sk);
469 err = put_user(amount, (int __user *) arg);
470 break;
471
472 case SIOCGSTAMP:
473 err = sock_get_timestamp(sk, (struct timeval __user *) arg);
474 break;
475
476 case SIOCGSTAMPNS:
477 err = sock_get_timestampns(sk, (struct timespec __user *) arg);
478 break;
479
480 default:
481 err = -ENOIOCTLCMD;
482 break;
483 }
484
485 return err;
486}
487EXPORT_SYMBOL(bt_sock_ioctl);
488
489int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
490{
491 DECLARE_WAITQUEUE(wait, current);
492 int err = 0;
493
494 BT_DBG("sk %p", sk);
495
496 add_wait_queue(sk_sleep(sk), &wait);
497 set_current_state(TASK_INTERRUPTIBLE);
498 while (sk->sk_state != state) {
499 if (!timeo) {
500 err = -EINPROGRESS;
501 break;
502 }
503
504 if (signal_pending(current)) {
505 err = sock_intr_errno(timeo);
506 break;
507 }
508
509 release_sock(sk);
510 timeo = schedule_timeout(timeo);
511 lock_sock(sk);
512 set_current_state(TASK_INTERRUPTIBLE);
513
514 err = sock_error(sk);
515 if (err)
516 break;
517 }
518 __set_current_state(TASK_RUNNING);
519 remove_wait_queue(sk_sleep(sk), &wait);
520 return err;
521}
522EXPORT_SYMBOL(bt_sock_wait_state);
523
524static struct net_proto_family bt_sock_family_ops = {
525 .owner = THIS_MODULE,
526 .family = PF_BLUETOOTH,
527 .create = bt_sock_create,
528};
529
530static int __init bt_init(void)
531{
532 int err;
533
534 BT_INFO("Core ver %s", VERSION);
535
536 err = bt_sysfs_init();
537 if (err < 0)
538 return err;
539
540 err = sock_register(&bt_sock_family_ops);
541 if (err < 0) {
542 bt_sysfs_cleanup();
543 return err;
544 }
545
546 BT_INFO("HCI device and connection manager initialized");
547
548 err = hci_sock_init();
549 if (err < 0)
550 goto error;
551
552 err = l2cap_init();
553 if (err < 0)
554 goto sock_err;
555
556 err = sco_init();
557 if (err < 0) {
558 l2cap_exit();
559 goto sock_err;
560 }
561
562 return 0;
563
564sock_err:
565 hci_sock_cleanup();
566
567error:
568 sock_unregister(PF_BLUETOOTH);
569 bt_sysfs_cleanup();
570
571 return err;
572}
573
574static void __exit bt_exit(void)
575{
576
577 sco_exit();
578
579 l2cap_exit();
580
581 hci_sock_cleanup();
582
583 sock_unregister(PF_BLUETOOTH);
584
585 bt_sysfs_cleanup();
586}
587
588subsys_initcall(bt_init);
589module_exit(bt_exit);
590
591MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
592MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
593MODULE_VERSION(VERSION);
594MODULE_LICENSE("GPL");
595MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);