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