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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
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);
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);