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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#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 (BTPROTO_LAST + 1)
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 "sk_lock-AF_BLUETOOTH-BTPROTO_ISO",
56};
57
58static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
59static const char *const bt_slock_key_strings[BT_MAX_PROTO] = {
60 "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
61 "slock-AF_BLUETOOTH-BTPROTO_HCI",
62 "slock-AF_BLUETOOTH-BTPROTO_SCO",
63 "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
64 "slock-AF_BLUETOOTH-BTPROTO_BNEP",
65 "slock-AF_BLUETOOTH-BTPROTO_CMTP",
66 "slock-AF_BLUETOOTH-BTPROTO_HIDP",
67 "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
68 "slock-AF_BLUETOOTH-BTPROTO_ISO",
69};
70
71void bt_sock_reclassify_lock(struct sock *sk, int proto)
72{
73 BUG_ON(!sk);
74 BUG_ON(!sock_allow_reclassification(sk));
75
76 sock_lock_init_class_and_name(sk,
77 bt_slock_key_strings[proto], &bt_slock_key[proto],
78 bt_key_strings[proto], &bt_lock_key[proto]);
79}
80EXPORT_SYMBOL(bt_sock_reclassify_lock);
81
82int bt_sock_register(int proto, const struct net_proto_family *ops)
83{
84 int err = 0;
85
86 if (proto < 0 || proto >= BT_MAX_PROTO)
87 return -EINVAL;
88
89 write_lock(&bt_proto_lock);
90
91 if (bt_proto[proto])
92 err = -EEXIST;
93 else
94 bt_proto[proto] = ops;
95
96 write_unlock(&bt_proto_lock);
97
98 return err;
99}
100EXPORT_SYMBOL(bt_sock_register);
101
102void bt_sock_unregister(int proto)
103{
104 if (proto < 0 || proto >= BT_MAX_PROTO)
105 return;
106
107 write_lock(&bt_proto_lock);
108 bt_proto[proto] = NULL;
109 write_unlock(&bt_proto_lock);
110}
111EXPORT_SYMBOL(bt_sock_unregister);
112
113static int bt_sock_create(struct net *net, struct socket *sock, int proto,
114 int kern)
115{
116 int err;
117
118 if (net != &init_net)
119 return -EAFNOSUPPORT;
120
121 if (proto < 0 || proto >= BT_MAX_PROTO)
122 return -EINVAL;
123
124 if (!bt_proto[proto])
125 request_module("bt-proto-%d", proto);
126
127 err = -EPROTONOSUPPORT;
128
129 read_lock(&bt_proto_lock);
130
131 if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
132 err = bt_proto[proto]->create(net, sock, proto, kern);
133 if (!err)
134 bt_sock_reclassify_lock(sock->sk, proto);
135 module_put(bt_proto[proto]->owner);
136 }
137
138 read_unlock(&bt_proto_lock);
139
140 return err;
141}
142
143struct sock *bt_sock_alloc(struct net *net, struct socket *sock,
144 struct proto *prot, int proto, gfp_t prio, int kern)
145{
146 struct sock *sk;
147
148 sk = sk_alloc(net, PF_BLUETOOTH, prio, prot, kern);
149 if (!sk)
150 return NULL;
151
152 sock_init_data(sock, sk);
153 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
154
155 sock_reset_flag(sk, SOCK_ZAPPED);
156
157 sk->sk_protocol = proto;
158 sk->sk_state = BT_OPEN;
159
160 /* Init peer information so it can be properly monitored */
161 if (!kern) {
162 spin_lock(&sk->sk_peer_lock);
163 sk->sk_peer_pid = get_pid(task_tgid(current));
164 sk->sk_peer_cred = get_current_cred();
165 spin_unlock(&sk->sk_peer_lock);
166 }
167
168 return sk;
169}
170EXPORT_SYMBOL(bt_sock_alloc);
171
172void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
173{
174 write_lock(&l->lock);
175 sk_add_node(sk, &l->head);
176 write_unlock(&l->lock);
177}
178EXPORT_SYMBOL(bt_sock_link);
179
180void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
181{
182 write_lock(&l->lock);
183 sk_del_node_init(sk);
184 write_unlock(&l->lock);
185}
186EXPORT_SYMBOL(bt_sock_unlink);
187
188bool bt_sock_linked(struct bt_sock_list *l, struct sock *s)
189{
190 struct sock *sk;
191
192 if (!l || !s)
193 return false;
194
195 read_lock(&l->lock);
196
197 sk_for_each(sk, &l->head) {
198 if (s == sk) {
199 read_unlock(&l->lock);
200 return true;
201 }
202 }
203
204 read_unlock(&l->lock);
205
206 return false;
207}
208EXPORT_SYMBOL(bt_sock_linked);
209
210void bt_accept_enqueue(struct sock *parent, struct sock *sk, bool bh)
211{
212 const struct cred *old_cred;
213 struct pid *old_pid;
214
215 BT_DBG("parent %p, sk %p", parent, sk);
216
217 sock_hold(sk);
218
219 if (bh)
220 bh_lock_sock_nested(sk);
221 else
222 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
223
224 list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
225 bt_sk(sk)->parent = parent;
226
227 /* Copy credentials from parent since for incoming connections the
228 * socket is allocated by the kernel.
229 */
230 spin_lock(&sk->sk_peer_lock);
231 old_pid = sk->sk_peer_pid;
232 old_cred = sk->sk_peer_cred;
233 sk->sk_peer_pid = get_pid(parent->sk_peer_pid);
234 sk->sk_peer_cred = get_cred(parent->sk_peer_cred);
235 spin_unlock(&sk->sk_peer_lock);
236
237 put_pid(old_pid);
238 put_cred(old_cred);
239
240 if (bh)
241 bh_unlock_sock(sk);
242 else
243 release_sock(sk);
244
245 sk_acceptq_added(parent);
246}
247EXPORT_SYMBOL(bt_accept_enqueue);
248
249/* Calling function must hold the sk lock.
250 * bt_sk(sk)->parent must be non-NULL meaning sk is in the parent list.
251 */
252void bt_accept_unlink(struct sock *sk)
253{
254 BT_DBG("sk %p state %d", sk, sk->sk_state);
255
256 list_del_init(&bt_sk(sk)->accept_q);
257 sk_acceptq_removed(bt_sk(sk)->parent);
258 bt_sk(sk)->parent = NULL;
259 sock_put(sk);
260}
261EXPORT_SYMBOL(bt_accept_unlink);
262
263struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
264{
265 struct bt_sock *s, *n;
266 struct sock *sk;
267
268 BT_DBG("parent %p", parent);
269
270restart:
271 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
272 sk = (struct sock *)s;
273
274 /* Prevent early freeing of sk due to unlink and sock_kill */
275 sock_hold(sk);
276 lock_sock(sk);
277
278 /* Check sk has not already been unlinked via
279 * bt_accept_unlink() due to serialisation caused by sk locking
280 */
281 if (!bt_sk(sk)->parent) {
282 BT_DBG("sk %p, already unlinked", sk);
283 release_sock(sk);
284 sock_put(sk);
285
286 /* Restart the loop as sk is no longer in the list
287 * and also avoid a potential infinite loop because
288 * list_for_each_entry_safe() is not thread safe.
289 */
290 goto restart;
291 }
292
293 /* sk is safely in the parent list so reduce reference count */
294 sock_put(sk);
295
296 /* FIXME: Is this check still needed */
297 if (sk->sk_state == BT_CLOSED) {
298 bt_accept_unlink(sk);
299 release_sock(sk);
300 continue;
301 }
302
303 if (sk->sk_state == BT_CONNECTED || !newsock ||
304 test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) {
305 bt_accept_unlink(sk);
306 if (newsock)
307 sock_graft(sk, newsock);
308
309 release_sock(sk);
310 return sk;
311 }
312
313 release_sock(sk);
314 }
315
316 return NULL;
317}
318EXPORT_SYMBOL(bt_accept_dequeue);
319
320int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
321 int flags)
322{
323 struct sock *sk = sock->sk;
324 struct sk_buff *skb;
325 size_t copied;
326 size_t skblen;
327 int err;
328
329 BT_DBG("sock %p sk %p len %zu", sock, sk, len);
330
331 if (flags & MSG_OOB)
332 return -EOPNOTSUPP;
333
334 skb = skb_recv_datagram(sk, flags, &err);
335 if (!skb) {
336 if (sk->sk_shutdown & RCV_SHUTDOWN)
337 err = 0;
338
339 return err;
340 }
341
342 skblen = skb->len;
343 copied = skb->len;
344 if (len < copied) {
345 msg->msg_flags |= MSG_TRUNC;
346 copied = len;
347 }
348
349 skb_reset_transport_header(skb);
350 err = skb_copy_datagram_msg(skb, 0, msg, copied);
351 if (err == 0) {
352 sock_recv_cmsgs(msg, sk, skb);
353
354 if (msg->msg_name && bt_sk(sk)->skb_msg_name)
355 bt_sk(sk)->skb_msg_name(skb, msg->msg_name,
356 &msg->msg_namelen);
357
358 if (test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags)) {
359 u8 pkt_status = hci_skb_pkt_status(skb);
360
361 put_cmsg(msg, SOL_BLUETOOTH, BT_SCM_PKT_STATUS,
362 sizeof(pkt_status), &pkt_status);
363 }
364 }
365
366 skb_free_datagram(sk, skb);
367
368 if (flags & MSG_TRUNC)
369 copied = skblen;
370
371 return err ? : copied;
372}
373EXPORT_SYMBOL(bt_sock_recvmsg);
374
375static long bt_sock_data_wait(struct sock *sk, long timeo)
376{
377 DECLARE_WAITQUEUE(wait, current);
378
379 add_wait_queue(sk_sleep(sk), &wait);
380 for (;;) {
381 set_current_state(TASK_INTERRUPTIBLE);
382
383 if (!skb_queue_empty(&sk->sk_receive_queue))
384 break;
385
386 if (sk->sk_err || (sk->sk_shutdown & RCV_SHUTDOWN))
387 break;
388
389 if (signal_pending(current) || !timeo)
390 break;
391
392 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
393 release_sock(sk);
394 timeo = schedule_timeout(timeo);
395 lock_sock(sk);
396 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
397 }
398
399 __set_current_state(TASK_RUNNING);
400 remove_wait_queue(sk_sleep(sk), &wait);
401 return timeo;
402}
403
404int bt_sock_stream_recvmsg(struct socket *sock, struct msghdr *msg,
405 size_t size, int flags)
406{
407 struct sock *sk = sock->sk;
408 int err = 0;
409 size_t target, copied = 0;
410 long timeo;
411
412 if (flags & MSG_OOB)
413 return -EOPNOTSUPP;
414
415 BT_DBG("sk %p size %zu", sk, size);
416
417 lock_sock(sk);
418
419 target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
420 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
421
422 do {
423 struct sk_buff *skb;
424 int chunk;
425
426 skb = skb_dequeue(&sk->sk_receive_queue);
427 if (!skb) {
428 if (copied >= target)
429 break;
430
431 err = sock_error(sk);
432 if (err)
433 break;
434 if (sk->sk_shutdown & RCV_SHUTDOWN)
435 break;
436
437 err = -EAGAIN;
438 if (!timeo)
439 break;
440
441 timeo = bt_sock_data_wait(sk, timeo);
442
443 if (signal_pending(current)) {
444 err = sock_intr_errno(timeo);
445 goto out;
446 }
447 continue;
448 }
449
450 chunk = min_t(unsigned int, skb->len, size);
451 if (skb_copy_datagram_msg(skb, 0, msg, chunk)) {
452 skb_queue_head(&sk->sk_receive_queue, skb);
453 if (!copied)
454 copied = -EFAULT;
455 break;
456 }
457 copied += chunk;
458 size -= chunk;
459
460 sock_recv_cmsgs(msg, sk, skb);
461
462 if (!(flags & MSG_PEEK)) {
463 int skb_len = skb_headlen(skb);
464
465 if (chunk <= skb_len) {
466 __skb_pull(skb, chunk);
467 } else {
468 struct sk_buff *frag;
469
470 __skb_pull(skb, skb_len);
471 chunk -= skb_len;
472
473 skb_walk_frags(skb, frag) {
474 if (chunk <= frag->len) {
475 /* Pulling partial data */
476 skb->len -= chunk;
477 skb->data_len -= chunk;
478 __skb_pull(frag, chunk);
479 break;
480 } else if (frag->len) {
481 /* Pulling all frag data */
482 chunk -= frag->len;
483 skb->len -= frag->len;
484 skb->data_len -= frag->len;
485 __skb_pull(frag, frag->len);
486 }
487 }
488 }
489
490 if (skb->len) {
491 skb_queue_head(&sk->sk_receive_queue, skb);
492 break;
493 }
494 kfree_skb(skb);
495
496 } else {
497 /* put message back and return */
498 skb_queue_head(&sk->sk_receive_queue, skb);
499 break;
500 }
501 } while (size);
502
503out:
504 release_sock(sk);
505 return copied ? : err;
506}
507EXPORT_SYMBOL(bt_sock_stream_recvmsg);
508
509static inline __poll_t bt_accept_poll(struct sock *parent)
510{
511 struct bt_sock *s, *n;
512 struct sock *sk;
513
514 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
515 sk = (struct sock *)s;
516 if (sk->sk_state == BT_CONNECTED ||
517 (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags) &&
518 sk->sk_state == BT_CONNECT2))
519 return EPOLLIN | EPOLLRDNORM;
520 }
521
522 return 0;
523}
524
525__poll_t bt_sock_poll(struct file *file, struct socket *sock,
526 poll_table *wait)
527{
528 struct sock *sk = sock->sk;
529 __poll_t mask = 0;
530
531 poll_wait(file, sk_sleep(sk), wait);
532
533 if (sk->sk_state == BT_LISTEN)
534 return bt_accept_poll(sk);
535
536 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
537 mask |= EPOLLERR |
538 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
539
540 if (sk->sk_shutdown & RCV_SHUTDOWN)
541 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
542
543 if (sk->sk_shutdown == SHUTDOWN_MASK)
544 mask |= EPOLLHUP;
545
546 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
547 mask |= EPOLLIN | EPOLLRDNORM;
548
549 if (sk->sk_state == BT_CLOSED)
550 mask |= EPOLLHUP;
551
552 if (sk->sk_state == BT_CONNECT ||
553 sk->sk_state == BT_CONNECT2 ||
554 sk->sk_state == BT_CONFIG)
555 return mask;
556
557 if (!test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags) && sock_writeable(sk))
558 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
559 else
560 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
561
562 return mask;
563}
564EXPORT_SYMBOL(bt_sock_poll);
565
566int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
567{
568 struct sock *sk = sock->sk;
569 struct sk_buff *skb;
570 long amount;
571 int err;
572
573 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
574
575 switch (cmd) {
576 case TIOCOUTQ:
577 if (sk->sk_state == BT_LISTEN)
578 return -EINVAL;
579
580 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
581 if (amount < 0)
582 amount = 0;
583 err = put_user(amount, (int __user *)arg);
584 break;
585
586 case TIOCINQ:
587 if (sk->sk_state == BT_LISTEN)
588 return -EINVAL;
589
590 spin_lock(&sk->sk_receive_queue.lock);
591 skb = skb_peek(&sk->sk_receive_queue);
592 amount = skb ? skb->len : 0;
593 spin_unlock(&sk->sk_receive_queue.lock);
594
595 err = put_user(amount, (int __user *)arg);
596 break;
597
598 default:
599 err = -ENOIOCTLCMD;
600 break;
601 }
602
603 return err;
604}
605EXPORT_SYMBOL(bt_sock_ioctl);
606
607/* This function expects the sk lock to be held when called */
608int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
609{
610 DECLARE_WAITQUEUE(wait, current);
611 int err = 0;
612
613 BT_DBG("sk %p", sk);
614
615 add_wait_queue(sk_sleep(sk), &wait);
616 set_current_state(TASK_INTERRUPTIBLE);
617 while (sk->sk_state != state) {
618 if (!timeo) {
619 err = -EINPROGRESS;
620 break;
621 }
622
623 if (signal_pending(current)) {
624 err = sock_intr_errno(timeo);
625 break;
626 }
627
628 release_sock(sk);
629 timeo = schedule_timeout(timeo);
630 lock_sock(sk);
631 set_current_state(TASK_INTERRUPTIBLE);
632
633 err = sock_error(sk);
634 if (err)
635 break;
636 }
637 __set_current_state(TASK_RUNNING);
638 remove_wait_queue(sk_sleep(sk), &wait);
639 return err;
640}
641EXPORT_SYMBOL(bt_sock_wait_state);
642
643/* This function expects the sk lock to be held when called */
644int bt_sock_wait_ready(struct sock *sk, unsigned int msg_flags)
645{
646 DECLARE_WAITQUEUE(wait, current);
647 unsigned long timeo;
648 int err = 0;
649
650 BT_DBG("sk %p", sk);
651
652 timeo = sock_sndtimeo(sk, !!(msg_flags & MSG_DONTWAIT));
653
654 add_wait_queue(sk_sleep(sk), &wait);
655 set_current_state(TASK_INTERRUPTIBLE);
656 while (test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags)) {
657 if (!timeo) {
658 err = -EAGAIN;
659 break;
660 }
661
662 if (signal_pending(current)) {
663 err = sock_intr_errno(timeo);
664 break;
665 }
666
667 release_sock(sk);
668 timeo = schedule_timeout(timeo);
669 lock_sock(sk);
670 set_current_state(TASK_INTERRUPTIBLE);
671
672 err = sock_error(sk);
673 if (err)
674 break;
675 }
676 __set_current_state(TASK_RUNNING);
677 remove_wait_queue(sk_sleep(sk), &wait);
678
679 return err;
680}
681EXPORT_SYMBOL(bt_sock_wait_ready);
682
683#ifdef CONFIG_PROC_FS
684static void *bt_seq_start(struct seq_file *seq, loff_t *pos)
685 __acquires(seq->private->l->lock)
686{
687 struct bt_sock_list *l = pde_data(file_inode(seq->file));
688
689 read_lock(&l->lock);
690 return seq_hlist_start_head(&l->head, *pos);
691}
692
693static void *bt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
694{
695 struct bt_sock_list *l = pde_data(file_inode(seq->file));
696
697 return seq_hlist_next(v, &l->head, pos);
698}
699
700static void bt_seq_stop(struct seq_file *seq, void *v)
701 __releases(seq->private->l->lock)
702{
703 struct bt_sock_list *l = pde_data(file_inode(seq->file));
704
705 read_unlock(&l->lock);
706}
707
708static int bt_seq_show(struct seq_file *seq, void *v)
709{
710 struct bt_sock_list *l = pde_data(file_inode(seq->file));
711
712 if (v == SEQ_START_TOKEN) {
713 seq_puts(seq, "sk RefCnt Rmem Wmem User Inode Parent");
714
715 if (l->custom_seq_show) {
716 seq_putc(seq, ' ');
717 l->custom_seq_show(seq, v);
718 }
719
720 seq_putc(seq, '\n');
721 } else {
722 struct sock *sk = sk_entry(v);
723 struct bt_sock *bt = bt_sk(sk);
724
725 seq_printf(seq,
726 "%pK %-6d %-6u %-6u %-6u %-6lu %-6lu",
727 sk,
728 refcount_read(&sk->sk_refcnt),
729 sk_rmem_alloc_get(sk),
730 sk_wmem_alloc_get(sk),
731 from_kuid(seq_user_ns(seq), sock_i_uid(sk)),
732 sock_i_ino(sk),
733 bt->parent ? sock_i_ino(bt->parent) : 0LU);
734
735 if (l->custom_seq_show) {
736 seq_putc(seq, ' ');
737 l->custom_seq_show(seq, v);
738 }
739
740 seq_putc(seq, '\n');
741 }
742 return 0;
743}
744
745static const struct seq_operations bt_seq_ops = {
746 .start = bt_seq_start,
747 .next = bt_seq_next,
748 .stop = bt_seq_stop,
749 .show = bt_seq_show,
750};
751
752int bt_procfs_init(struct net *net, const char *name,
753 struct bt_sock_list *sk_list,
754 int (*seq_show)(struct seq_file *, void *))
755{
756 sk_list->custom_seq_show = seq_show;
757
758 if (!proc_create_seq_data(name, 0, net->proc_net, &bt_seq_ops, sk_list))
759 return -ENOMEM;
760 return 0;
761}
762
763void bt_procfs_cleanup(struct net *net, const char *name)
764{
765 remove_proc_entry(name, net->proc_net);
766}
767#else
768int bt_procfs_init(struct net *net, const char *name,
769 struct bt_sock_list *sk_list,
770 int (*seq_show)(struct seq_file *, void *))
771{
772 return 0;
773}
774
775void bt_procfs_cleanup(struct net *net, const char *name)
776{
777}
778#endif
779EXPORT_SYMBOL(bt_procfs_init);
780EXPORT_SYMBOL(bt_procfs_cleanup);
781
782static const struct net_proto_family bt_sock_family_ops = {
783 .owner = THIS_MODULE,
784 .family = PF_BLUETOOTH,
785 .create = bt_sock_create,
786};
787
788struct dentry *bt_debugfs;
789EXPORT_SYMBOL_GPL(bt_debugfs);
790
791#define VERSION __stringify(BT_SUBSYS_VERSION) "." \
792 __stringify(BT_SUBSYS_REVISION)
793
794static int __init bt_init(void)
795{
796 int err;
797
798 sock_skb_cb_check_size(sizeof(struct bt_skb_cb));
799
800 BT_INFO("Core ver %s", VERSION);
801
802 err = bt_selftest();
803 if (err < 0)
804 return err;
805
806 bt_debugfs = debugfs_create_dir("bluetooth", NULL);
807
808 bt_leds_init();
809
810 err = bt_sysfs_init();
811 if (err < 0)
812 goto cleanup_led;
813
814 err = sock_register(&bt_sock_family_ops);
815 if (err)
816 goto cleanup_sysfs;
817
818 BT_INFO("HCI device and connection manager initialized");
819
820 err = hci_sock_init();
821 if (err)
822 goto unregister_socket;
823
824 err = l2cap_init();
825 if (err)
826 goto cleanup_socket;
827
828 err = sco_init();
829 if (err)
830 goto cleanup_cap;
831
832 err = mgmt_init();
833 if (err)
834 goto cleanup_sco;
835
836 return 0;
837
838cleanup_sco:
839 sco_exit();
840cleanup_cap:
841 l2cap_exit();
842cleanup_socket:
843 hci_sock_cleanup();
844unregister_socket:
845 sock_unregister(PF_BLUETOOTH);
846cleanup_sysfs:
847 bt_sysfs_cleanup();
848cleanup_led:
849 bt_leds_cleanup();
850 debugfs_remove_recursive(bt_debugfs);
851 return err;
852}
853
854static void __exit bt_exit(void)
855{
856 iso_exit();
857
858 mgmt_exit();
859
860 sco_exit();
861
862 l2cap_exit();
863
864 hci_sock_cleanup();
865
866 sock_unregister(PF_BLUETOOTH);
867
868 bt_sysfs_cleanup();
869
870 bt_leds_cleanup();
871
872 debugfs_remove_recursive(bt_debugfs);
873}
874
875subsys_initcall(bt_init);
876module_exit(bt_exit);
877
878MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
879MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
880MODULE_VERSION(VERSION);
881MODULE_LICENSE("GPL");
882MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);