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