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1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth address family and sockets. */
26
27#include <linux/module.h>
28#include <linux/debugfs.h>
29#include <linux/stringify.h>
30#include <linux/sched/signal.h>
31
32#include <asm/ioctls.h>
33
34#include <net/bluetooth/bluetooth.h>
35#include <linux/proc_fs.h>
36
37#include "leds.h"
38#include "selftest.h"
39
40/* Bluetooth sockets */
41#define BT_MAX_PROTO (BTPROTO_LAST + 1)
42static const struct net_proto_family *bt_proto[BT_MAX_PROTO];
43static DEFINE_RWLOCK(bt_proto_lock);
44
45static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
46static const char *const bt_key_strings[BT_MAX_PROTO] = {
47 "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
48 "sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
49 "sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
50 "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
51 "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
52 "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
53 "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
54 "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
55 "sk_lock-AF_BLUETOOTH-BTPROTO_ISO",
56};
57
58static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
59static const char *const bt_slock_key_strings[BT_MAX_PROTO] = {
60 "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
61 "slock-AF_BLUETOOTH-BTPROTO_HCI",
62 "slock-AF_BLUETOOTH-BTPROTO_SCO",
63 "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
64 "slock-AF_BLUETOOTH-BTPROTO_BNEP",
65 "slock-AF_BLUETOOTH-BTPROTO_CMTP",
66 "slock-AF_BLUETOOTH-BTPROTO_HIDP",
67 "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
68 "slock-AF_BLUETOOTH-BTPROTO_ISO",
69};
70
71void bt_sock_reclassify_lock(struct sock *sk, int proto)
72{
73 BUG_ON(!sk);
74 BUG_ON(!sock_allow_reclassification(sk));
75
76 sock_lock_init_class_and_name(sk,
77 bt_slock_key_strings[proto], &bt_slock_key[proto],
78 bt_key_strings[proto], &bt_lock_key[proto]);
79}
80EXPORT_SYMBOL(bt_sock_reclassify_lock);
81
82int bt_sock_register(int proto, const struct net_proto_family *ops)
83{
84 int err = 0;
85
86 if (proto < 0 || proto >= BT_MAX_PROTO)
87 return -EINVAL;
88
89 write_lock(&bt_proto_lock);
90
91 if (bt_proto[proto])
92 err = -EEXIST;
93 else
94 bt_proto[proto] = ops;
95
96 write_unlock(&bt_proto_lock);
97
98 return err;
99}
100EXPORT_SYMBOL(bt_sock_register);
101
102void bt_sock_unregister(int proto)
103{
104 if (proto < 0 || proto >= BT_MAX_PROTO)
105 return;
106
107 write_lock(&bt_proto_lock);
108 bt_proto[proto] = NULL;
109 write_unlock(&bt_proto_lock);
110}
111EXPORT_SYMBOL(bt_sock_unregister);
112
113static int bt_sock_create(struct net *net, struct socket *sock, int proto,
114 int kern)
115{
116 int err;
117
118 if (net != &init_net)
119 return -EAFNOSUPPORT;
120
121 if (proto < 0 || proto >= BT_MAX_PROTO)
122 return -EINVAL;
123
124 if (!bt_proto[proto])
125 request_module("bt-proto-%d", proto);
126
127 err = -EPROTONOSUPPORT;
128
129 read_lock(&bt_proto_lock);
130
131 if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
132 err = bt_proto[proto]->create(net, sock, proto, kern);
133 if (!err)
134 bt_sock_reclassify_lock(sock->sk, proto);
135 module_put(bt_proto[proto]->owner);
136 }
137
138 read_unlock(&bt_proto_lock);
139
140 return err;
141}
142
143struct sock *bt_sock_alloc(struct net *net, struct socket *sock,
144 struct proto *prot, int proto, gfp_t prio, int kern)
145{
146 struct sock *sk;
147
148 sk = sk_alloc(net, PF_BLUETOOTH, prio, prot, kern);
149 if (!sk)
150 return NULL;
151
152 sock_init_data(sock, sk);
153 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
154
155 sock_reset_flag(sk, SOCK_ZAPPED);
156
157 sk->sk_protocol = proto;
158 sk->sk_state = BT_OPEN;
159
160 /* Init peer information so it can be properly monitored */
161 if (!kern) {
162 spin_lock(&sk->sk_peer_lock);
163 sk->sk_peer_pid = get_pid(task_tgid(current));
164 sk->sk_peer_cred = get_current_cred();
165 spin_unlock(&sk->sk_peer_lock);
166 }
167
168 return sk;
169}
170EXPORT_SYMBOL(bt_sock_alloc);
171
172void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
173{
174 write_lock(&l->lock);
175 sk_add_node(sk, &l->head);
176 write_unlock(&l->lock);
177}
178EXPORT_SYMBOL(bt_sock_link);
179
180void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
181{
182 write_lock(&l->lock);
183 sk_del_node_init(sk);
184 write_unlock(&l->lock);
185}
186EXPORT_SYMBOL(bt_sock_unlink);
187
188bool bt_sock_linked(struct bt_sock_list *l, struct sock *s)
189{
190 struct sock *sk;
191
192 if (!l || !s)
193 return false;
194
195 read_lock(&l->lock);
196
197 sk_for_each(sk, &l->head) {
198 if (s == sk) {
199 read_unlock(&l->lock);
200 return true;
201 }
202 }
203
204 read_unlock(&l->lock);
205
206 return false;
207}
208EXPORT_SYMBOL(bt_sock_linked);
209
210void bt_accept_enqueue(struct sock *parent, struct sock *sk, bool bh)
211{
212 const struct cred *old_cred;
213 struct pid *old_pid;
214
215 BT_DBG("parent %p, sk %p", parent, sk);
216
217 sock_hold(sk);
218
219 if (bh)
220 bh_lock_sock_nested(sk);
221 else
222 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
223
224 list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
225 bt_sk(sk)->parent = parent;
226
227 /* Copy credentials from parent since for incoming connections the
228 * socket is allocated by the kernel.
229 */
230 spin_lock(&sk->sk_peer_lock);
231 old_pid = sk->sk_peer_pid;
232 old_cred = sk->sk_peer_cred;
233 sk->sk_peer_pid = get_pid(parent->sk_peer_pid);
234 sk->sk_peer_cred = get_cred(parent->sk_peer_cred);
235 spin_unlock(&sk->sk_peer_lock);
236
237 put_pid(old_pid);
238 put_cred(old_cred);
239
240 if (bh)
241 bh_unlock_sock(sk);
242 else
243 release_sock(sk);
244
245 sk_acceptq_added(parent);
246}
247EXPORT_SYMBOL(bt_accept_enqueue);
248
249/* Calling function must hold the sk lock.
250 * bt_sk(sk)->parent must be non-NULL meaning sk is in the parent list.
251 */
252void bt_accept_unlink(struct sock *sk)
253{
254 BT_DBG("sk %p state %d", sk, sk->sk_state);
255
256 list_del_init(&bt_sk(sk)->accept_q);
257 sk_acceptq_removed(bt_sk(sk)->parent);
258 bt_sk(sk)->parent = NULL;
259 sock_put(sk);
260}
261EXPORT_SYMBOL(bt_accept_unlink);
262
263struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
264{
265 struct bt_sock *s, *n;
266 struct sock *sk;
267
268 BT_DBG("parent %p", parent);
269
270restart:
271 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
272 sk = (struct sock *)s;
273
274 /* Prevent early freeing of sk due to unlink and sock_kill */
275 sock_hold(sk);
276 lock_sock(sk);
277
278 /* Check sk has not already been unlinked via
279 * bt_accept_unlink() due to serialisation caused by sk locking
280 */
281 if (!bt_sk(sk)->parent) {
282 BT_DBG("sk %p, already unlinked", sk);
283 release_sock(sk);
284 sock_put(sk);
285
286 /* Restart the loop as sk is no longer in the list
287 * and also avoid a potential infinite loop because
288 * list_for_each_entry_safe() is not thread safe.
289 */
290 goto restart;
291 }
292
293 /* sk is safely in the parent list so reduce reference count */
294 sock_put(sk);
295
296 /* FIXME: Is this check still needed */
297 if (sk->sk_state == BT_CLOSED) {
298 bt_accept_unlink(sk);
299 release_sock(sk);
300 continue;
301 }
302
303 if (sk->sk_state == BT_CONNECTED || !newsock ||
304 test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) {
305 bt_accept_unlink(sk);
306 if (newsock)
307 sock_graft(sk, newsock);
308
309 release_sock(sk);
310 return sk;
311 }
312
313 release_sock(sk);
314 }
315
316 return NULL;
317}
318EXPORT_SYMBOL(bt_accept_dequeue);
319
320int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
321 int flags)
322{
323 struct sock *sk = sock->sk;
324 struct sk_buff *skb;
325 size_t copied;
326 size_t skblen;
327 int err;
328
329 BT_DBG("sock %p sk %p len %zu", sock, sk, len);
330
331 if (flags & MSG_OOB)
332 return -EOPNOTSUPP;
333
334 skb = skb_recv_datagram(sk, flags, &err);
335 if (!skb) {
336 if (sk->sk_shutdown & RCV_SHUTDOWN)
337 err = 0;
338
339 return err;
340 }
341
342 skblen = skb->len;
343 copied = skb->len;
344 if (len < copied) {
345 msg->msg_flags |= MSG_TRUNC;
346 copied = len;
347 }
348
349 skb_reset_transport_header(skb);
350 err = skb_copy_datagram_msg(skb, 0, msg, copied);
351 if (err == 0) {
352 sock_recv_cmsgs(msg, sk, skb);
353
354 if (msg->msg_name && bt_sk(sk)->skb_msg_name)
355 bt_sk(sk)->skb_msg_name(skb, msg->msg_name,
356 &msg->msg_namelen);
357
358 if (test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags)) {
359 u8 pkt_status = hci_skb_pkt_status(skb);
360
361 put_cmsg(msg, SOL_BLUETOOTH, BT_SCM_PKT_STATUS,
362 sizeof(pkt_status), &pkt_status);
363 }
364 }
365
366 skb_free_datagram(sk, skb);
367
368 if (flags & MSG_TRUNC)
369 copied = skblen;
370
371 return err ? : copied;
372}
373EXPORT_SYMBOL(bt_sock_recvmsg);
374
375static long bt_sock_data_wait(struct sock *sk, long timeo)
376{
377 DECLARE_WAITQUEUE(wait, current);
378
379 add_wait_queue(sk_sleep(sk), &wait);
380 for (;;) {
381 set_current_state(TASK_INTERRUPTIBLE);
382
383 if (!skb_queue_empty(&sk->sk_receive_queue))
384 break;
385
386 if (sk->sk_err || (sk->sk_shutdown & RCV_SHUTDOWN))
387 break;
388
389 if (signal_pending(current) || !timeo)
390 break;
391
392 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
393 release_sock(sk);
394 timeo = schedule_timeout(timeo);
395 lock_sock(sk);
396 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
397 }
398
399 __set_current_state(TASK_RUNNING);
400 remove_wait_queue(sk_sleep(sk), &wait);
401 return timeo;
402}
403
404int bt_sock_stream_recvmsg(struct socket *sock, struct msghdr *msg,
405 size_t size, int flags)
406{
407 struct sock *sk = sock->sk;
408 int err = 0;
409 size_t target, copied = 0;
410 long timeo;
411
412 if (flags & MSG_OOB)
413 return -EOPNOTSUPP;
414
415 BT_DBG("sk %p size %zu", sk, size);
416
417 lock_sock(sk);
418
419 target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
420 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
421
422 do {
423 struct sk_buff *skb;
424 int chunk;
425
426 skb = skb_dequeue(&sk->sk_receive_queue);
427 if (!skb) {
428 if (copied >= target)
429 break;
430
431 err = sock_error(sk);
432 if (err)
433 break;
434 if (sk->sk_shutdown & RCV_SHUTDOWN)
435 break;
436
437 err = -EAGAIN;
438 if (!timeo)
439 break;
440
441 timeo = bt_sock_data_wait(sk, timeo);
442
443 if (signal_pending(current)) {
444 err = sock_intr_errno(timeo);
445 goto out;
446 }
447 continue;
448 }
449
450 chunk = min_t(unsigned int, skb->len, size);
451 if (skb_copy_datagram_msg(skb, 0, msg, chunk)) {
452 skb_queue_head(&sk->sk_receive_queue, skb);
453 if (!copied)
454 copied = -EFAULT;
455 break;
456 }
457 copied += chunk;
458 size -= chunk;
459
460 sock_recv_cmsgs(msg, sk, skb);
461
462 if (!(flags & MSG_PEEK)) {
463 int skb_len = skb_headlen(skb);
464
465 if (chunk <= skb_len) {
466 __skb_pull(skb, chunk);
467 } else {
468 struct sk_buff *frag;
469
470 __skb_pull(skb, skb_len);
471 chunk -= skb_len;
472
473 skb_walk_frags(skb, frag) {
474 if (chunk <= frag->len) {
475 /* Pulling partial data */
476 skb->len -= chunk;
477 skb->data_len -= chunk;
478 __skb_pull(frag, chunk);
479 break;
480 } else if (frag->len) {
481 /* Pulling all frag data */
482 chunk -= frag->len;
483 skb->len -= frag->len;
484 skb->data_len -= frag->len;
485 __skb_pull(frag, frag->len);
486 }
487 }
488 }
489
490 if (skb->len) {
491 skb_queue_head(&sk->sk_receive_queue, skb);
492 break;
493 }
494 kfree_skb(skb);
495
496 } else {
497 /* put message back and return */
498 skb_queue_head(&sk->sk_receive_queue, skb);
499 break;
500 }
501 } while (size);
502
503out:
504 release_sock(sk);
505 return copied ? : err;
506}
507EXPORT_SYMBOL(bt_sock_stream_recvmsg);
508
509static inline __poll_t bt_accept_poll(struct sock *parent)
510{
511 struct bt_sock *s, *n;
512 struct sock *sk;
513
514 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
515 sk = (struct sock *)s;
516 if (sk->sk_state == BT_CONNECTED ||
517 (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags) &&
518 sk->sk_state == BT_CONNECT2))
519 return EPOLLIN | EPOLLRDNORM;
520 }
521
522 return 0;
523}
524
525__poll_t bt_sock_poll(struct file *file, struct socket *sock,
526 poll_table *wait)
527{
528 struct sock *sk = sock->sk;
529 __poll_t mask = 0;
530
531 poll_wait(file, sk_sleep(sk), wait);
532
533 if (sk->sk_state == BT_LISTEN)
534 return bt_accept_poll(sk);
535
536 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
537 mask |= EPOLLERR |
538 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
539
540 if (sk->sk_shutdown & RCV_SHUTDOWN)
541 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
542
543 if (sk->sk_shutdown == SHUTDOWN_MASK)
544 mask |= EPOLLHUP;
545
546 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
547 mask |= EPOLLIN | EPOLLRDNORM;
548
549 if (sk->sk_state == BT_CLOSED)
550 mask |= EPOLLHUP;
551
552 if (sk->sk_state == BT_CONNECT ||
553 sk->sk_state == BT_CONNECT2 ||
554 sk->sk_state == BT_CONFIG)
555 return mask;
556
557 if (!test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags) && sock_writeable(sk))
558 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
559 else
560 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
561
562 return mask;
563}
564EXPORT_SYMBOL(bt_sock_poll);
565
566int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
567{
568 struct sock *sk = sock->sk;
569 struct sk_buff *skb;
570 long amount;
571 int err;
572
573 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
574
575 switch (cmd) {
576 case TIOCOUTQ:
577 if (sk->sk_state == BT_LISTEN)
578 return -EINVAL;
579
580 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
581 if (amount < 0)
582 amount = 0;
583 err = put_user(amount, (int __user *)arg);
584 break;
585
586 case TIOCINQ:
587 if (sk->sk_state == BT_LISTEN)
588 return -EINVAL;
589
590 spin_lock(&sk->sk_receive_queue.lock);
591 skb = skb_peek(&sk->sk_receive_queue);
592 amount = skb ? skb->len : 0;
593 spin_unlock(&sk->sk_receive_queue.lock);
594
595 err = put_user(amount, (int __user *)arg);
596 break;
597
598 default:
599 err = -ENOIOCTLCMD;
600 break;
601 }
602
603 return err;
604}
605EXPORT_SYMBOL(bt_sock_ioctl);
606
607/* This function expects the sk lock to be held when called */
608int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
609{
610 DECLARE_WAITQUEUE(wait, current);
611 int err = 0;
612
613 BT_DBG("sk %p", sk);
614
615 add_wait_queue(sk_sleep(sk), &wait);
616 set_current_state(TASK_INTERRUPTIBLE);
617 while (sk->sk_state != state) {
618 if (!timeo) {
619 err = -EINPROGRESS;
620 break;
621 }
622
623 if (signal_pending(current)) {
624 err = sock_intr_errno(timeo);
625 break;
626 }
627
628 release_sock(sk);
629 timeo = schedule_timeout(timeo);
630 lock_sock(sk);
631 set_current_state(TASK_INTERRUPTIBLE);
632
633 err = sock_error(sk);
634 if (err)
635 break;
636 }
637 __set_current_state(TASK_RUNNING);
638 remove_wait_queue(sk_sleep(sk), &wait);
639 return err;
640}
641EXPORT_SYMBOL(bt_sock_wait_state);
642
643/* This function expects the sk lock to be held when called */
644int bt_sock_wait_ready(struct sock *sk, unsigned int msg_flags)
645{
646 DECLARE_WAITQUEUE(wait, current);
647 unsigned long timeo;
648 int err = 0;
649
650 BT_DBG("sk %p", sk);
651
652 timeo = sock_sndtimeo(sk, !!(msg_flags & MSG_DONTWAIT));
653
654 add_wait_queue(sk_sleep(sk), &wait);
655 set_current_state(TASK_INTERRUPTIBLE);
656 while (test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags)) {
657 if (!timeo) {
658 err = -EAGAIN;
659 break;
660 }
661
662 if (signal_pending(current)) {
663 err = sock_intr_errno(timeo);
664 break;
665 }
666
667 release_sock(sk);
668 timeo = schedule_timeout(timeo);
669 lock_sock(sk);
670 set_current_state(TASK_INTERRUPTIBLE);
671
672 err = sock_error(sk);
673 if (err)
674 break;
675 }
676 __set_current_state(TASK_RUNNING);
677 remove_wait_queue(sk_sleep(sk), &wait);
678
679 return err;
680}
681EXPORT_SYMBOL(bt_sock_wait_ready);
682
683#ifdef CONFIG_PROC_FS
684static void *bt_seq_start(struct seq_file *seq, loff_t *pos)
685 __acquires(seq->private->l->lock)
686{
687 struct bt_sock_list *l = pde_data(file_inode(seq->file));
688
689 read_lock(&l->lock);
690 return seq_hlist_start_head(&l->head, *pos);
691}
692
693static void *bt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
694{
695 struct bt_sock_list *l = pde_data(file_inode(seq->file));
696
697 return seq_hlist_next(v, &l->head, pos);
698}
699
700static void bt_seq_stop(struct seq_file *seq, void *v)
701 __releases(seq->private->l->lock)
702{
703 struct bt_sock_list *l = pde_data(file_inode(seq->file));
704
705 read_unlock(&l->lock);
706}
707
708static int bt_seq_show(struct seq_file *seq, void *v)
709{
710 struct bt_sock_list *l = pde_data(file_inode(seq->file));
711
712 if (v == SEQ_START_TOKEN) {
713 seq_puts(seq, "sk RefCnt Rmem Wmem User Inode Parent");
714
715 if (l->custom_seq_show) {
716 seq_putc(seq, ' ');
717 l->custom_seq_show(seq, v);
718 }
719
720 seq_putc(seq, '\n');
721 } else {
722 struct sock *sk = sk_entry(v);
723 struct bt_sock *bt = bt_sk(sk);
724
725 seq_printf(seq,
726 "%pK %-6d %-6u %-6u %-6u %-6lu %-6lu",
727 sk,
728 refcount_read(&sk->sk_refcnt),
729 sk_rmem_alloc_get(sk),
730 sk_wmem_alloc_get(sk),
731 from_kuid(seq_user_ns(seq), sock_i_uid(sk)),
732 sock_i_ino(sk),
733 bt->parent ? sock_i_ino(bt->parent) : 0LU);
734
735 if (l->custom_seq_show) {
736 seq_putc(seq, ' ');
737 l->custom_seq_show(seq, v);
738 }
739
740 seq_putc(seq, '\n');
741 }
742 return 0;
743}
744
745static const struct seq_operations bt_seq_ops = {
746 .start = bt_seq_start,
747 .next = bt_seq_next,
748 .stop = bt_seq_stop,
749 .show = bt_seq_show,
750};
751
752int bt_procfs_init(struct net *net, const char *name,
753 struct bt_sock_list *sk_list,
754 int (*seq_show)(struct seq_file *, void *))
755{
756 sk_list->custom_seq_show = seq_show;
757
758 if (!proc_create_seq_data(name, 0, net->proc_net, &bt_seq_ops, sk_list))
759 return -ENOMEM;
760 return 0;
761}
762
763void bt_procfs_cleanup(struct net *net, const char *name)
764{
765 remove_proc_entry(name, net->proc_net);
766}
767#else
768int bt_procfs_init(struct net *net, const char *name,
769 struct bt_sock_list *sk_list,
770 int (*seq_show)(struct seq_file *, void *))
771{
772 return 0;
773}
774
775void bt_procfs_cleanup(struct net *net, const char *name)
776{
777}
778#endif
779EXPORT_SYMBOL(bt_procfs_init);
780EXPORT_SYMBOL(bt_procfs_cleanup);
781
782static const struct net_proto_family bt_sock_family_ops = {
783 .owner = THIS_MODULE,
784 .family = PF_BLUETOOTH,
785 .create = bt_sock_create,
786};
787
788struct dentry *bt_debugfs;
789EXPORT_SYMBOL_GPL(bt_debugfs);
790
791#define VERSION __stringify(BT_SUBSYS_VERSION) "." \
792 __stringify(BT_SUBSYS_REVISION)
793
794static int __init bt_init(void)
795{
796 int err;
797
798 sock_skb_cb_check_size(sizeof(struct bt_skb_cb));
799
800 BT_INFO("Core ver %s", VERSION);
801
802 err = bt_selftest();
803 if (err < 0)
804 return err;
805
806 bt_debugfs = debugfs_create_dir("bluetooth", NULL);
807
808 bt_leds_init();
809
810 err = bt_sysfs_init();
811 if (err < 0)
812 goto cleanup_led;
813
814 err = sock_register(&bt_sock_family_ops);
815 if (err)
816 goto cleanup_sysfs;
817
818 BT_INFO("HCI device and connection manager initialized");
819
820 err = hci_sock_init();
821 if (err)
822 goto unregister_socket;
823
824 err = l2cap_init();
825 if (err)
826 goto cleanup_socket;
827
828 err = sco_init();
829 if (err)
830 goto cleanup_cap;
831
832 err = mgmt_init();
833 if (err)
834 goto cleanup_sco;
835
836 return 0;
837
838cleanup_sco:
839 sco_exit();
840cleanup_cap:
841 l2cap_exit();
842cleanup_socket:
843 hci_sock_cleanup();
844unregister_socket:
845 sock_unregister(PF_BLUETOOTH);
846cleanup_sysfs:
847 bt_sysfs_cleanup();
848cleanup_led:
849 bt_leds_cleanup();
850 debugfs_remove_recursive(bt_debugfs);
851 return err;
852}
853
854static void __exit bt_exit(void)
855{
856 iso_exit();
857
858 mgmt_exit();
859
860 sco_exit();
861
862 l2cap_exit();
863
864 hci_sock_cleanup();
865
866 sock_unregister(PF_BLUETOOTH);
867
868 bt_sysfs_cleanup();
869
870 bt_leds_cleanup();
871
872 debugfs_remove_recursive(bt_debugfs);
873}
874
875subsys_initcall(bt_init);
876module_exit(bt_exit);
877
878MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
879MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
880MODULE_VERSION(VERSION);
881MODULE_LICENSE("GPL");
882MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);
1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth address family and sockets. */
26
27#include <linux/module.h>
28#include <linux/debugfs.h>
29#include <linux/stringify.h>
30#include <linux/sched/signal.h>
31
32#include <asm/ioctls.h>
33
34#include <net/bluetooth/bluetooth.h>
35#include <linux/proc_fs.h>
36
37#include "leds.h"
38#include "selftest.h"
39
40/* Bluetooth sockets */
41#define BT_MAX_PROTO (BTPROTO_LAST + 1)
42static const struct net_proto_family *bt_proto[BT_MAX_PROTO];
43static DEFINE_RWLOCK(bt_proto_lock);
44
45static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
46static const char *const bt_key_strings[BT_MAX_PROTO] = {
47 "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
48 "sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
49 "sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
50 "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
51 "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
52 "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
53 "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
54 "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
55 "sk_lock-AF_BLUETOOTH-BTPROTO_ISO",
56};
57
58static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
59static const char *const bt_slock_key_strings[BT_MAX_PROTO] = {
60 "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
61 "slock-AF_BLUETOOTH-BTPROTO_HCI",
62 "slock-AF_BLUETOOTH-BTPROTO_SCO",
63 "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
64 "slock-AF_BLUETOOTH-BTPROTO_BNEP",
65 "slock-AF_BLUETOOTH-BTPROTO_CMTP",
66 "slock-AF_BLUETOOTH-BTPROTO_HIDP",
67 "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
68 "slock-AF_BLUETOOTH-BTPROTO_ISO",
69};
70
71void bt_sock_reclassify_lock(struct sock *sk, int proto)
72{
73 BUG_ON(!sk);
74 BUG_ON(!sock_allow_reclassification(sk));
75
76 sock_lock_init_class_and_name(sk,
77 bt_slock_key_strings[proto], &bt_slock_key[proto],
78 bt_key_strings[proto], &bt_lock_key[proto]);
79}
80EXPORT_SYMBOL(bt_sock_reclassify_lock);
81
82int bt_sock_register(int proto, const struct net_proto_family *ops)
83{
84 int err = 0;
85
86 if (proto < 0 || proto >= BT_MAX_PROTO)
87 return -EINVAL;
88
89 write_lock(&bt_proto_lock);
90
91 if (bt_proto[proto])
92 err = -EEXIST;
93 else
94 bt_proto[proto] = ops;
95
96 write_unlock(&bt_proto_lock);
97
98 return err;
99}
100EXPORT_SYMBOL(bt_sock_register);
101
102void bt_sock_unregister(int proto)
103{
104 if (proto < 0 || proto >= BT_MAX_PROTO)
105 return;
106
107 write_lock(&bt_proto_lock);
108 bt_proto[proto] = NULL;
109 write_unlock(&bt_proto_lock);
110}
111EXPORT_SYMBOL(bt_sock_unregister);
112
113static int bt_sock_create(struct net *net, struct socket *sock, int proto,
114 int kern)
115{
116 int err;
117
118 if (net != &init_net)
119 return -EAFNOSUPPORT;
120
121 if (proto < 0 || proto >= BT_MAX_PROTO)
122 return -EINVAL;
123
124 if (!bt_proto[proto])
125 request_module("bt-proto-%d", proto);
126
127 err = -EPROTONOSUPPORT;
128
129 read_lock(&bt_proto_lock);
130
131 if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
132 err = bt_proto[proto]->create(net, sock, proto, kern);
133 if (!err)
134 bt_sock_reclassify_lock(sock->sk, proto);
135 module_put(bt_proto[proto]->owner);
136 }
137
138 read_unlock(&bt_proto_lock);
139
140 return err;
141}
142
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);