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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 <linux/stringify.h>
30#include <linux/sched/signal.h>
31
32#include <asm/ioctls.h>
33
34#include <net/bluetooth/bluetooth.h>
35#include <linux/proc_fs.h>
36
37#include "leds.h"
38#include "selftest.h"
39
40/* Bluetooth sockets */
41#define BT_MAX_PROTO 8
42static const struct net_proto_family *bt_proto[BT_MAX_PROTO];
43static DEFINE_RWLOCK(bt_proto_lock);
44
45static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
46static const char *const bt_key_strings[BT_MAX_PROTO] = {
47 "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
48 "sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
49 "sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
50 "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
51 "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
52 "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
53 "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
54 "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
55};
56
57static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
58static const char *const bt_slock_key_strings[BT_MAX_PROTO] = {
59 "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
60 "slock-AF_BLUETOOTH-BTPROTO_HCI",
61 "slock-AF_BLUETOOTH-BTPROTO_SCO",
62 "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
63 "slock-AF_BLUETOOTH-BTPROTO_BNEP",
64 "slock-AF_BLUETOOTH-BTPROTO_CMTP",
65 "slock-AF_BLUETOOTH-BTPROTO_HIDP",
66 "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
67};
68
69void bt_sock_reclassify_lock(struct sock *sk, int proto)
70{
71 BUG_ON(!sk);
72 BUG_ON(!sock_allow_reclassification(sk));
73
74 sock_lock_init_class_and_name(sk,
75 bt_slock_key_strings[proto], &bt_slock_key[proto],
76 bt_key_strings[proto], &bt_lock_key[proto]);
77}
78EXPORT_SYMBOL(bt_sock_reclassify_lock);
79
80int bt_sock_register(int proto, const struct net_proto_family *ops)
81{
82 int err = 0;
83
84 if (proto < 0 || proto >= BT_MAX_PROTO)
85 return -EINVAL;
86
87 write_lock(&bt_proto_lock);
88
89 if (bt_proto[proto])
90 err = -EEXIST;
91 else
92 bt_proto[proto] = ops;
93
94 write_unlock(&bt_proto_lock);
95
96 return err;
97}
98EXPORT_SYMBOL(bt_sock_register);
99
100void bt_sock_unregister(int proto)
101{
102 if (proto < 0 || proto >= BT_MAX_PROTO)
103 return;
104
105 write_lock(&bt_proto_lock);
106 bt_proto[proto] = NULL;
107 write_unlock(&bt_proto_lock);
108}
109EXPORT_SYMBOL(bt_sock_unregister);
110
111static int bt_sock_create(struct net *net, struct socket *sock, int proto,
112 int kern)
113{
114 int err;
115
116 if (net != &init_net)
117 return -EAFNOSUPPORT;
118
119 if (proto < 0 || proto >= BT_MAX_PROTO)
120 return -EINVAL;
121
122 if (!bt_proto[proto])
123 request_module("bt-proto-%d", proto);
124
125 err = -EPROTONOSUPPORT;
126
127 read_lock(&bt_proto_lock);
128
129 if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
130 err = bt_proto[proto]->create(net, sock, proto, kern);
131 if (!err)
132 bt_sock_reclassify_lock(sock->sk, proto);
133 module_put(bt_proto[proto]->owner);
134 }
135
136 read_unlock(&bt_proto_lock);
137
138 return err;
139}
140
141void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
142{
143 write_lock(&l->lock);
144 sk_add_node(sk, &l->head);
145 write_unlock(&l->lock);
146}
147EXPORT_SYMBOL(bt_sock_link);
148
149void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
150{
151 write_lock(&l->lock);
152 sk_del_node_init(sk);
153 write_unlock(&l->lock);
154}
155EXPORT_SYMBOL(bt_sock_unlink);
156
157void bt_accept_enqueue(struct sock *parent, struct sock *sk, bool bh)
158{
159 BT_DBG("parent %p, sk %p", parent, sk);
160
161 sock_hold(sk);
162
163 if (bh)
164 bh_lock_sock_nested(sk);
165 else
166 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
167
168 list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
169 bt_sk(sk)->parent = parent;
170
171 if (bh)
172 bh_unlock_sock(sk);
173 else
174 release_sock(sk);
175
176 parent->sk_ack_backlog++;
177}
178EXPORT_SYMBOL(bt_accept_enqueue);
179
180/* Calling function must hold the sk lock.
181 * bt_sk(sk)->parent must be non-NULL meaning sk is in the parent list.
182 */
183void bt_accept_unlink(struct sock *sk)
184{
185 BT_DBG("sk %p state %d", sk, sk->sk_state);
186
187 list_del_init(&bt_sk(sk)->accept_q);
188 bt_sk(sk)->parent->sk_ack_backlog--;
189 bt_sk(sk)->parent = NULL;
190 sock_put(sk);
191}
192EXPORT_SYMBOL(bt_accept_unlink);
193
194struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
195{
196 struct bt_sock *s, *n;
197 struct sock *sk;
198
199 BT_DBG("parent %p", parent);
200
201restart:
202 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
203 sk = (struct sock *)s;
204
205 /* Prevent early freeing of sk due to unlink and sock_kill */
206 sock_hold(sk);
207 lock_sock(sk);
208
209 /* Check sk has not already been unlinked via
210 * bt_accept_unlink() due to serialisation caused by sk locking
211 */
212 if (!bt_sk(sk)->parent) {
213 BT_DBG("sk %p, already unlinked", sk);
214 release_sock(sk);
215 sock_put(sk);
216
217 /* Restart the loop as sk is no longer in the list
218 * and also avoid a potential infinite loop because
219 * list_for_each_entry_safe() is not thread safe.
220 */
221 goto restart;
222 }
223
224 /* sk is safely in the parent list so reduce reference count */
225 sock_put(sk);
226
227 /* FIXME: Is this check still needed */
228 if (sk->sk_state == BT_CLOSED) {
229 bt_accept_unlink(sk);
230 release_sock(sk);
231 continue;
232 }
233
234 if (sk->sk_state == BT_CONNECTED || !newsock ||
235 test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) {
236 bt_accept_unlink(sk);
237 if (newsock)
238 sock_graft(sk, newsock);
239
240 release_sock(sk);
241 return sk;
242 }
243
244 release_sock(sk);
245 }
246
247 return NULL;
248}
249EXPORT_SYMBOL(bt_accept_dequeue);
250
251int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
252 int flags)
253{
254 int noblock = flags & MSG_DONTWAIT;
255 struct sock *sk = sock->sk;
256 struct sk_buff *skb;
257 size_t copied;
258 size_t skblen;
259 int err;
260
261 BT_DBG("sock %p sk %p len %zu", sock, sk, len);
262
263 if (flags & MSG_OOB)
264 return -EOPNOTSUPP;
265
266 skb = skb_recv_datagram(sk, flags, noblock, &err);
267 if (!skb) {
268 if (sk->sk_shutdown & RCV_SHUTDOWN)
269 return 0;
270
271 return err;
272 }
273
274 skblen = skb->len;
275 copied = skb->len;
276 if (len < copied) {
277 msg->msg_flags |= MSG_TRUNC;
278 copied = len;
279 }
280
281 skb_reset_transport_header(skb);
282 err = skb_copy_datagram_msg(skb, 0, msg, copied);
283 if (err == 0) {
284 sock_recv_ts_and_drops(msg, sk, skb);
285
286 if (msg->msg_name && bt_sk(sk)->skb_msg_name)
287 bt_sk(sk)->skb_msg_name(skb, msg->msg_name,
288 &msg->msg_namelen);
289 }
290
291 skb_free_datagram(sk, skb);
292
293 if (flags & MSG_TRUNC)
294 copied = skblen;
295
296 return err ? : copied;
297}
298EXPORT_SYMBOL(bt_sock_recvmsg);
299
300static long bt_sock_data_wait(struct sock *sk, long timeo)
301{
302 DECLARE_WAITQUEUE(wait, current);
303
304 add_wait_queue(sk_sleep(sk), &wait);
305 for (;;) {
306 set_current_state(TASK_INTERRUPTIBLE);
307
308 if (!skb_queue_empty(&sk->sk_receive_queue))
309 break;
310
311 if (sk->sk_err || (sk->sk_shutdown & RCV_SHUTDOWN))
312 break;
313
314 if (signal_pending(current) || !timeo)
315 break;
316
317 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
318 release_sock(sk);
319 timeo = schedule_timeout(timeo);
320 lock_sock(sk);
321 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
322 }
323
324 __set_current_state(TASK_RUNNING);
325 remove_wait_queue(sk_sleep(sk), &wait);
326 return timeo;
327}
328
329int bt_sock_stream_recvmsg(struct socket *sock, struct msghdr *msg,
330 size_t size, int flags)
331{
332 struct sock *sk = sock->sk;
333 int err = 0;
334 size_t target, copied = 0;
335 long timeo;
336
337 if (flags & MSG_OOB)
338 return -EOPNOTSUPP;
339
340 BT_DBG("sk %p size %zu", sk, size);
341
342 lock_sock(sk);
343
344 target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
345 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
346
347 do {
348 struct sk_buff *skb;
349 int chunk;
350
351 skb = skb_dequeue(&sk->sk_receive_queue);
352 if (!skb) {
353 if (copied >= target)
354 break;
355
356 err = sock_error(sk);
357 if (err)
358 break;
359 if (sk->sk_shutdown & RCV_SHUTDOWN)
360 break;
361
362 err = -EAGAIN;
363 if (!timeo)
364 break;
365
366 timeo = bt_sock_data_wait(sk, timeo);
367
368 if (signal_pending(current)) {
369 err = sock_intr_errno(timeo);
370 goto out;
371 }
372 continue;
373 }
374
375 chunk = min_t(unsigned int, skb->len, size);
376 if (skb_copy_datagram_msg(skb, 0, msg, chunk)) {
377 skb_queue_head(&sk->sk_receive_queue, skb);
378 if (!copied)
379 copied = -EFAULT;
380 break;
381 }
382 copied += chunk;
383 size -= chunk;
384
385 sock_recv_ts_and_drops(msg, sk, skb);
386
387 if (!(flags & MSG_PEEK)) {
388 int skb_len = skb_headlen(skb);
389
390 if (chunk <= skb_len) {
391 __skb_pull(skb, chunk);
392 } else {
393 struct sk_buff *frag;
394
395 __skb_pull(skb, skb_len);
396 chunk -= skb_len;
397
398 skb_walk_frags(skb, frag) {
399 if (chunk <= frag->len) {
400 /* Pulling partial data */
401 skb->len -= chunk;
402 skb->data_len -= chunk;
403 __skb_pull(frag, chunk);
404 break;
405 } else if (frag->len) {
406 /* Pulling all frag data */
407 chunk -= frag->len;
408 skb->len -= frag->len;
409 skb->data_len -= frag->len;
410 __skb_pull(frag, frag->len);
411 }
412 }
413 }
414
415 if (skb->len) {
416 skb_queue_head(&sk->sk_receive_queue, skb);
417 break;
418 }
419 kfree_skb(skb);
420
421 } else {
422 /* put message back and return */
423 skb_queue_head(&sk->sk_receive_queue, skb);
424 break;
425 }
426 } while (size);
427
428out:
429 release_sock(sk);
430 return copied ? : err;
431}
432EXPORT_SYMBOL(bt_sock_stream_recvmsg);
433
434static inline __poll_t bt_accept_poll(struct sock *parent)
435{
436 struct bt_sock *s, *n;
437 struct sock *sk;
438
439 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
440 sk = (struct sock *)s;
441 if (sk->sk_state == BT_CONNECTED ||
442 (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags) &&
443 sk->sk_state == BT_CONNECT2))
444 return EPOLLIN | EPOLLRDNORM;
445 }
446
447 return 0;
448}
449
450__poll_t bt_sock_poll(struct file *file, struct socket *sock,
451 poll_table *wait)
452{
453 struct sock *sk = sock->sk;
454 __poll_t mask = 0;
455
456 BT_DBG("sock %p, sk %p", sock, sk);
457
458 poll_wait(file, sk_sleep(sk), wait);
459
460 if (sk->sk_state == BT_LISTEN)
461 return bt_accept_poll(sk);
462
463 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
464 mask |= EPOLLERR |
465 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
466
467 if (sk->sk_shutdown & RCV_SHUTDOWN)
468 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
469
470 if (sk->sk_shutdown == SHUTDOWN_MASK)
471 mask |= EPOLLHUP;
472
473 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
474 mask |= EPOLLIN | EPOLLRDNORM;
475
476 if (sk->sk_state == BT_CLOSED)
477 mask |= EPOLLHUP;
478
479 if (sk->sk_state == BT_CONNECT ||
480 sk->sk_state == BT_CONNECT2 ||
481 sk->sk_state == BT_CONFIG)
482 return mask;
483
484 if (!test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags) && sock_writeable(sk))
485 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
486 else
487 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
488
489 return mask;
490}
491EXPORT_SYMBOL(bt_sock_poll);
492
493int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
494{
495 struct sock *sk = sock->sk;
496 struct sk_buff *skb;
497 long amount;
498 int err;
499
500 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
501
502 switch (cmd) {
503 case TIOCOUTQ:
504 if (sk->sk_state == BT_LISTEN)
505 return -EINVAL;
506
507 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
508 if (amount < 0)
509 amount = 0;
510 err = put_user(amount, (int __user *) arg);
511 break;
512
513 case TIOCINQ:
514 if (sk->sk_state == BT_LISTEN)
515 return -EINVAL;
516
517 lock_sock(sk);
518 skb = skb_peek(&sk->sk_receive_queue);
519 amount = skb ? skb->len : 0;
520 release_sock(sk);
521 err = put_user(amount, (int __user *) arg);
522 break;
523
524 default:
525 err = -ENOIOCTLCMD;
526 break;
527 }
528
529 return err;
530}
531EXPORT_SYMBOL(bt_sock_ioctl);
532
533/* This function expects the sk lock to be held when called */
534int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
535{
536 DECLARE_WAITQUEUE(wait, current);
537 int err = 0;
538
539 BT_DBG("sk %p", sk);
540
541 add_wait_queue(sk_sleep(sk), &wait);
542 set_current_state(TASK_INTERRUPTIBLE);
543 while (sk->sk_state != state) {
544 if (!timeo) {
545 err = -EINPROGRESS;
546 break;
547 }
548
549 if (signal_pending(current)) {
550 err = sock_intr_errno(timeo);
551 break;
552 }
553
554 release_sock(sk);
555 timeo = schedule_timeout(timeo);
556 lock_sock(sk);
557 set_current_state(TASK_INTERRUPTIBLE);
558
559 err = sock_error(sk);
560 if (err)
561 break;
562 }
563 __set_current_state(TASK_RUNNING);
564 remove_wait_queue(sk_sleep(sk), &wait);
565 return err;
566}
567EXPORT_SYMBOL(bt_sock_wait_state);
568
569/* This function expects the sk lock to be held when called */
570int bt_sock_wait_ready(struct sock *sk, unsigned long flags)
571{
572 DECLARE_WAITQUEUE(wait, current);
573 unsigned long timeo;
574 int err = 0;
575
576 BT_DBG("sk %p", sk);
577
578 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
579
580 add_wait_queue(sk_sleep(sk), &wait);
581 set_current_state(TASK_INTERRUPTIBLE);
582 while (test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags)) {
583 if (!timeo) {
584 err = -EAGAIN;
585 break;
586 }
587
588 if (signal_pending(current)) {
589 err = sock_intr_errno(timeo);
590 break;
591 }
592
593 release_sock(sk);
594 timeo = schedule_timeout(timeo);
595 lock_sock(sk);
596 set_current_state(TASK_INTERRUPTIBLE);
597
598 err = sock_error(sk);
599 if (err)
600 break;
601 }
602 __set_current_state(TASK_RUNNING);
603 remove_wait_queue(sk_sleep(sk), &wait);
604
605 return err;
606}
607EXPORT_SYMBOL(bt_sock_wait_ready);
608
609#ifdef CONFIG_PROC_FS
610static void *bt_seq_start(struct seq_file *seq, loff_t *pos)
611 __acquires(seq->private->l->lock)
612{
613 struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
614
615 read_lock(&l->lock);
616 return seq_hlist_start_head(&l->head, *pos);
617}
618
619static void *bt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
620{
621 struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
622
623 return seq_hlist_next(v, &l->head, pos);
624}
625
626static void bt_seq_stop(struct seq_file *seq, void *v)
627 __releases(seq->private->l->lock)
628{
629 struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
630
631 read_unlock(&l->lock);
632}
633
634static int bt_seq_show(struct seq_file *seq, void *v)
635{
636 struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
637
638 if (v == SEQ_START_TOKEN) {
639 seq_puts(seq ,"sk RefCnt Rmem Wmem User Inode Parent");
640
641 if (l->custom_seq_show) {
642 seq_putc(seq, ' ');
643 l->custom_seq_show(seq, v);
644 }
645
646 seq_putc(seq, '\n');
647 } else {
648 struct sock *sk = sk_entry(v);
649 struct bt_sock *bt = bt_sk(sk);
650
651 seq_printf(seq,
652 "%pK %-6d %-6u %-6u %-6u %-6lu %-6lu",
653 sk,
654 refcount_read(&sk->sk_refcnt),
655 sk_rmem_alloc_get(sk),
656 sk_wmem_alloc_get(sk),
657 from_kuid(seq_user_ns(seq), sock_i_uid(sk)),
658 sock_i_ino(sk),
659 bt->parent? sock_i_ino(bt->parent): 0LU);
660
661 if (l->custom_seq_show) {
662 seq_putc(seq, ' ');
663 l->custom_seq_show(seq, v);
664 }
665
666 seq_putc(seq, '\n');
667 }
668 return 0;
669}
670
671static const struct seq_operations bt_seq_ops = {
672 .start = bt_seq_start,
673 .next = bt_seq_next,
674 .stop = bt_seq_stop,
675 .show = bt_seq_show,
676};
677
678int bt_procfs_init(struct net *net, const char *name,
679 struct bt_sock_list *sk_list,
680 int (* seq_show)(struct seq_file *, void *))
681{
682 sk_list->custom_seq_show = seq_show;
683
684 if (!proc_create_seq_data(name, 0, net->proc_net, &bt_seq_ops, sk_list))
685 return -ENOMEM;
686 return 0;
687}
688
689void bt_procfs_cleanup(struct net *net, const char *name)
690{
691 remove_proc_entry(name, net->proc_net);
692}
693#else
694int bt_procfs_init(struct net *net, const char *name,
695 struct bt_sock_list *sk_list,
696 int (* seq_show)(struct seq_file *, void *))
697{
698 return 0;
699}
700
701void bt_procfs_cleanup(struct net *net, const char *name)
702{
703}
704#endif
705EXPORT_SYMBOL(bt_procfs_init);
706EXPORT_SYMBOL(bt_procfs_cleanup);
707
708static const struct net_proto_family bt_sock_family_ops = {
709 .owner = THIS_MODULE,
710 .family = PF_BLUETOOTH,
711 .create = bt_sock_create,
712};
713
714struct dentry *bt_debugfs;
715EXPORT_SYMBOL_GPL(bt_debugfs);
716
717#define VERSION __stringify(BT_SUBSYS_VERSION) "." \
718 __stringify(BT_SUBSYS_REVISION)
719
720static int __init bt_init(void)
721{
722 int err;
723
724 sock_skb_cb_check_size(sizeof(struct bt_skb_cb));
725
726 BT_INFO("Core ver %s", VERSION);
727
728 err = bt_selftest();
729 if (err < 0)
730 return err;
731
732 bt_debugfs = debugfs_create_dir("bluetooth", NULL);
733
734 bt_leds_init();
735
736 err = bt_sysfs_init();
737 if (err < 0)
738 return err;
739
740 err = sock_register(&bt_sock_family_ops);
741 if (err)
742 goto cleanup_sysfs;
743
744 BT_INFO("HCI device and connection manager initialized");
745
746 err = hci_sock_init();
747 if (err)
748 goto unregister_socket;
749
750 err = l2cap_init();
751 if (err)
752 goto cleanup_socket;
753
754 err = sco_init();
755 if (err)
756 goto cleanup_cap;
757
758 err = mgmt_init();
759 if (err)
760 goto cleanup_sco;
761
762 return 0;
763
764cleanup_sco:
765 sco_exit();
766cleanup_cap:
767 l2cap_exit();
768cleanup_socket:
769 hci_sock_cleanup();
770unregister_socket:
771 sock_unregister(PF_BLUETOOTH);
772cleanup_sysfs:
773 bt_sysfs_cleanup();
774 return err;
775}
776
777static void __exit bt_exit(void)
778{
779 mgmt_exit();
780
781 sco_exit();
782
783 l2cap_exit();
784
785 hci_sock_cleanup();
786
787 sock_unregister(PF_BLUETOOTH);
788
789 bt_sysfs_cleanup();
790
791 bt_leds_cleanup();
792
793 debugfs_remove_recursive(bt_debugfs);
794}
795
796subsys_initcall(bt_init);
797module_exit(bt_exit);
798
799MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
800MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
801MODULE_VERSION(VERSION);
802MODULE_LICENSE("GPL");
803MODULE_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);