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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 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 sk_acceptq_added(parent);
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 sk_acceptq_removed(bt_sk(sk)->parent);
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 if (bt_sk(sk)->skb_put_cmsg)
291 bt_sk(sk)->skb_put_cmsg(skb, msg, sk);
292 }
293
294 skb_free_datagram(sk, skb);
295
296 if (flags & MSG_TRUNC)
297 copied = skblen;
298
299 return err ? : copied;
300}
301EXPORT_SYMBOL(bt_sock_recvmsg);
302
303static long bt_sock_data_wait(struct sock *sk, long timeo)
304{
305 DECLARE_WAITQUEUE(wait, current);
306
307 add_wait_queue(sk_sleep(sk), &wait);
308 for (;;) {
309 set_current_state(TASK_INTERRUPTIBLE);
310
311 if (!skb_queue_empty(&sk->sk_receive_queue))
312 break;
313
314 if (sk->sk_err || (sk->sk_shutdown & RCV_SHUTDOWN))
315 break;
316
317 if (signal_pending(current) || !timeo)
318 break;
319
320 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
321 release_sock(sk);
322 timeo = schedule_timeout(timeo);
323 lock_sock(sk);
324 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
325 }
326
327 __set_current_state(TASK_RUNNING);
328 remove_wait_queue(sk_sleep(sk), &wait);
329 return timeo;
330}
331
332int bt_sock_stream_recvmsg(struct socket *sock, struct msghdr *msg,
333 size_t size, int flags)
334{
335 struct sock *sk = sock->sk;
336 int err = 0;
337 size_t target, copied = 0;
338 long timeo;
339
340 if (flags & MSG_OOB)
341 return -EOPNOTSUPP;
342
343 BT_DBG("sk %p size %zu", sk, size);
344
345 lock_sock(sk);
346
347 target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
348 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
349
350 do {
351 struct sk_buff *skb;
352 int chunk;
353
354 skb = skb_dequeue(&sk->sk_receive_queue);
355 if (!skb) {
356 if (copied >= target)
357 break;
358
359 err = sock_error(sk);
360 if (err)
361 break;
362 if (sk->sk_shutdown & RCV_SHUTDOWN)
363 break;
364
365 err = -EAGAIN;
366 if (!timeo)
367 break;
368
369 timeo = bt_sock_data_wait(sk, timeo);
370
371 if (signal_pending(current)) {
372 err = sock_intr_errno(timeo);
373 goto out;
374 }
375 continue;
376 }
377
378 chunk = min_t(unsigned int, skb->len, size);
379 if (skb_copy_datagram_msg(skb, 0, msg, chunk)) {
380 skb_queue_head(&sk->sk_receive_queue, skb);
381 if (!copied)
382 copied = -EFAULT;
383 break;
384 }
385 copied += chunk;
386 size -= chunk;
387
388 sock_recv_ts_and_drops(msg, sk, skb);
389
390 if (!(flags & MSG_PEEK)) {
391 int skb_len = skb_headlen(skb);
392
393 if (chunk <= skb_len) {
394 __skb_pull(skb, chunk);
395 } else {
396 struct sk_buff *frag;
397
398 __skb_pull(skb, skb_len);
399 chunk -= skb_len;
400
401 skb_walk_frags(skb, frag) {
402 if (chunk <= frag->len) {
403 /* Pulling partial data */
404 skb->len -= chunk;
405 skb->data_len -= chunk;
406 __skb_pull(frag, chunk);
407 break;
408 } else if (frag->len) {
409 /* Pulling all frag data */
410 chunk -= frag->len;
411 skb->len -= frag->len;
412 skb->data_len -= frag->len;
413 __skb_pull(frag, frag->len);
414 }
415 }
416 }
417
418 if (skb->len) {
419 skb_queue_head(&sk->sk_receive_queue, skb);
420 break;
421 }
422 kfree_skb(skb);
423
424 } else {
425 /* put message back and return */
426 skb_queue_head(&sk->sk_receive_queue, skb);
427 break;
428 }
429 } while (size);
430
431out:
432 release_sock(sk);
433 return copied ? : err;
434}
435EXPORT_SYMBOL(bt_sock_stream_recvmsg);
436
437static inline __poll_t bt_accept_poll(struct sock *parent)
438{
439 struct bt_sock *s, *n;
440 struct sock *sk;
441
442 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
443 sk = (struct sock *)s;
444 if (sk->sk_state == BT_CONNECTED ||
445 (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags) &&
446 sk->sk_state == BT_CONNECT2))
447 return EPOLLIN | EPOLLRDNORM;
448 }
449
450 return 0;
451}
452
453__poll_t bt_sock_poll(struct file *file, struct socket *sock,
454 poll_table *wait)
455{
456 struct sock *sk = sock->sk;
457 __poll_t mask = 0;
458
459 poll_wait(file, sk_sleep(sk), wait);
460
461 if (sk->sk_state == BT_LISTEN)
462 return bt_accept_poll(sk);
463
464 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
465 mask |= EPOLLERR |
466 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
467
468 if (sk->sk_shutdown & RCV_SHUTDOWN)
469 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
470
471 if (sk->sk_shutdown == SHUTDOWN_MASK)
472 mask |= EPOLLHUP;
473
474 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
475 mask |= EPOLLIN | EPOLLRDNORM;
476
477 if (sk->sk_state == BT_CLOSED)
478 mask |= EPOLLHUP;
479
480 if (sk->sk_state == BT_CONNECT ||
481 sk->sk_state == BT_CONNECT2 ||
482 sk->sk_state == BT_CONFIG)
483 return mask;
484
485 if (!test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags) && sock_writeable(sk))
486 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
487 else
488 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
489
490 return mask;
491}
492EXPORT_SYMBOL(bt_sock_poll);
493
494int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
495{
496 struct sock *sk = sock->sk;
497 struct sk_buff *skb;
498 long amount;
499 int err;
500
501 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
502
503 switch (cmd) {
504 case TIOCOUTQ:
505 if (sk->sk_state == BT_LISTEN)
506 return -EINVAL;
507
508 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
509 if (amount < 0)
510 amount = 0;
511 err = put_user(amount, (int __user *) arg);
512 break;
513
514 case TIOCINQ:
515 if (sk->sk_state == BT_LISTEN)
516 return -EINVAL;
517
518 lock_sock(sk);
519 skb = skb_peek(&sk->sk_receive_queue);
520 amount = skb ? skb->len : 0;
521 release_sock(sk);
522 err = put_user(amount, (int __user *) arg);
523 break;
524
525 default:
526 err = -ENOIOCTLCMD;
527 break;
528 }
529
530 return err;
531}
532EXPORT_SYMBOL(bt_sock_ioctl);
533
534/* This function expects the sk lock to be held when called */
535int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
536{
537 DECLARE_WAITQUEUE(wait, current);
538 int err = 0;
539
540 BT_DBG("sk %p", sk);
541
542 add_wait_queue(sk_sleep(sk), &wait);
543 set_current_state(TASK_INTERRUPTIBLE);
544 while (sk->sk_state != state) {
545 if (!timeo) {
546 err = -EINPROGRESS;
547 break;
548 }
549
550 if (signal_pending(current)) {
551 err = sock_intr_errno(timeo);
552 break;
553 }
554
555 release_sock(sk);
556 timeo = schedule_timeout(timeo);
557 lock_sock(sk);
558 set_current_state(TASK_INTERRUPTIBLE);
559
560 err = sock_error(sk);
561 if (err)
562 break;
563 }
564 __set_current_state(TASK_RUNNING);
565 remove_wait_queue(sk_sleep(sk), &wait);
566 return err;
567}
568EXPORT_SYMBOL(bt_sock_wait_state);
569
570/* This function expects the sk lock to be held when called */
571int bt_sock_wait_ready(struct sock *sk, unsigned long flags)
572{
573 DECLARE_WAITQUEUE(wait, current);
574 unsigned long timeo;
575 int err = 0;
576
577 BT_DBG("sk %p", sk);
578
579 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
580
581 add_wait_queue(sk_sleep(sk), &wait);
582 set_current_state(TASK_INTERRUPTIBLE);
583 while (test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags)) {
584 if (!timeo) {
585 err = -EAGAIN;
586 break;
587 }
588
589 if (signal_pending(current)) {
590 err = sock_intr_errno(timeo);
591 break;
592 }
593
594 release_sock(sk);
595 timeo = schedule_timeout(timeo);
596 lock_sock(sk);
597 set_current_state(TASK_INTERRUPTIBLE);
598
599 err = sock_error(sk);
600 if (err)
601 break;
602 }
603 __set_current_state(TASK_RUNNING);
604 remove_wait_queue(sk_sleep(sk), &wait);
605
606 return err;
607}
608EXPORT_SYMBOL(bt_sock_wait_ready);
609
610#ifdef CONFIG_PROC_FS
611static void *bt_seq_start(struct seq_file *seq, loff_t *pos)
612 __acquires(seq->private->l->lock)
613{
614 struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
615
616 read_lock(&l->lock);
617 return seq_hlist_start_head(&l->head, *pos);
618}
619
620static void *bt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
621{
622 struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
623
624 return seq_hlist_next(v, &l->head, pos);
625}
626
627static void bt_seq_stop(struct seq_file *seq, void *v)
628 __releases(seq->private->l->lock)
629{
630 struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
631
632 read_unlock(&l->lock);
633}
634
635static int bt_seq_show(struct seq_file *seq, void *v)
636{
637 struct bt_sock_list *l = PDE_DATA(file_inode(seq->file));
638
639 if (v == SEQ_START_TOKEN) {
640 seq_puts(seq ,"sk RefCnt Rmem Wmem User Inode Parent");
641
642 if (l->custom_seq_show) {
643 seq_putc(seq, ' ');
644 l->custom_seq_show(seq, v);
645 }
646
647 seq_putc(seq, '\n');
648 } else {
649 struct sock *sk = sk_entry(v);
650 struct bt_sock *bt = bt_sk(sk);
651
652 seq_printf(seq,
653 "%pK %-6d %-6u %-6u %-6u %-6lu %-6lu",
654 sk,
655 refcount_read(&sk->sk_refcnt),
656 sk_rmem_alloc_get(sk),
657 sk_wmem_alloc_get(sk),
658 from_kuid(seq_user_ns(seq), sock_i_uid(sk)),
659 sock_i_ino(sk),
660 bt->parent? sock_i_ino(bt->parent): 0LU);
661
662 if (l->custom_seq_show) {
663 seq_putc(seq, ' ');
664 l->custom_seq_show(seq, v);
665 }
666
667 seq_putc(seq, '\n');
668 }
669 return 0;
670}
671
672static const struct seq_operations bt_seq_ops = {
673 .start = bt_seq_start,
674 .next = bt_seq_next,
675 .stop = bt_seq_stop,
676 .show = bt_seq_show,
677};
678
679int bt_procfs_init(struct net *net, const char *name,
680 struct bt_sock_list *sk_list,
681 int (* seq_show)(struct seq_file *, void *))
682{
683 sk_list->custom_seq_show = seq_show;
684
685 if (!proc_create_seq_data(name, 0, net->proc_net, &bt_seq_ops, sk_list))
686 return -ENOMEM;
687 return 0;
688}
689
690void bt_procfs_cleanup(struct net *net, const char *name)
691{
692 remove_proc_entry(name, net->proc_net);
693}
694#else
695int bt_procfs_init(struct net *net, const char *name,
696 struct bt_sock_list *sk_list,
697 int (* seq_show)(struct seq_file *, void *))
698{
699 return 0;
700}
701
702void bt_procfs_cleanup(struct net *net, const char *name)
703{
704}
705#endif
706EXPORT_SYMBOL(bt_procfs_init);
707EXPORT_SYMBOL(bt_procfs_cleanup);
708
709static const struct net_proto_family bt_sock_family_ops = {
710 .owner = THIS_MODULE,
711 .family = PF_BLUETOOTH,
712 .create = bt_sock_create,
713};
714
715struct dentry *bt_debugfs;
716EXPORT_SYMBOL_GPL(bt_debugfs);
717
718#define VERSION __stringify(BT_SUBSYS_VERSION) "." \
719 __stringify(BT_SUBSYS_REVISION)
720
721static int __init bt_init(void)
722{
723 int err;
724
725 sock_skb_cb_check_size(sizeof(struct bt_skb_cb));
726
727 BT_INFO("Core ver %s", VERSION);
728
729 err = bt_selftest();
730 if (err < 0)
731 return err;
732
733 bt_debugfs = debugfs_create_dir("bluetooth", NULL);
734
735 bt_leds_init();
736
737 err = bt_sysfs_init();
738 if (err < 0)
739 return err;
740
741 err = sock_register(&bt_sock_family_ops);
742 if (err)
743 goto cleanup_sysfs;
744
745 BT_INFO("HCI device and connection manager initialized");
746
747 err = hci_sock_init();
748 if (err)
749 goto unregister_socket;
750
751 err = l2cap_init();
752 if (err)
753 goto cleanup_socket;
754
755 err = sco_init();
756 if (err)
757 goto cleanup_cap;
758
759 err = mgmt_init();
760 if (err)
761 goto cleanup_sco;
762
763 return 0;
764
765cleanup_sco:
766 sco_exit();
767cleanup_cap:
768 l2cap_exit();
769cleanup_socket:
770 hci_sock_cleanup();
771unregister_socket:
772 sock_unregister(PF_BLUETOOTH);
773cleanup_sysfs:
774 bt_sysfs_cleanup();
775 return err;
776}
777
778static void __exit bt_exit(void)
779{
780 mgmt_exit();
781
782 sco_exit();
783
784 l2cap_exit();
785
786 hci_sock_cleanup();
787
788 sock_unregister(PF_BLUETOOTH);
789
790 bt_sysfs_cleanup();
791
792 bt_leds_cleanup();
793
794 debugfs_remove_recursive(bt_debugfs);
795}
796
797subsys_initcall(bt_init);
798module_exit(bt_exit);
799
800MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
801MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
802MODULE_VERSION(VERSION);
803MODULE_LICENSE("GPL");
804MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);