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