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)
42 static const struct net_proto_family *bt_proto[BT_MAX_PROTO];
43 static DEFINE_RWLOCK(bt_proto_lock);
44
45 static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
46 static 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
58 static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
59 static 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
bt_sock_reclassify_lock(struct sock * sk,int proto)71 void 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 }
80 EXPORT_SYMBOL(bt_sock_reclassify_lock);
81
bt_sock_register(int proto,const struct net_proto_family * ops)82 int 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 }
100 EXPORT_SYMBOL(bt_sock_register);
101
bt_sock_unregister(int proto)102 void 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 }
111 EXPORT_SYMBOL(bt_sock_unregister);
112
bt_sock_create(struct net * net,struct socket * sock,int proto,int kern)113 static 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
bt_sock_alloc(struct net * net,struct socket * sock,struct proto * prot,int proto,gfp_t prio,int kern)143 struct 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 }
170 EXPORT_SYMBOL(bt_sock_alloc);
171
bt_sock_link(struct bt_sock_list * l,struct sock * sk)172 void 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 }
178 EXPORT_SYMBOL(bt_sock_link);
179
bt_sock_unlink(struct bt_sock_list * l,struct sock * sk)180 void 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 }
186 EXPORT_SYMBOL(bt_sock_unlink);
187
bt_sock_linked(struct bt_sock_list * l,struct sock * s)188 bool 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 }
208 EXPORT_SYMBOL(bt_sock_linked);
209
bt_accept_enqueue(struct sock * parent,struct sock * sk,bool bh)210 void 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 }
247 EXPORT_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 */
bt_accept_unlink(struct sock * sk)252 void 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 }
261 EXPORT_SYMBOL(bt_accept_unlink);
262
bt_accept_dequeue(struct sock * parent,struct socket * newsock)263 struct 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
270 restart:
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 }
318 EXPORT_SYMBOL(bt_accept_dequeue);
319
bt_sock_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)320 int 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 }
373 EXPORT_SYMBOL(bt_sock_recvmsg);
374
bt_sock_data_wait(struct sock * sk,long timeo)375 static 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
bt_sock_stream_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)404 int 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
503 out:
504 release_sock(sk);
505 return copied ? : err;
506 }
507 EXPORT_SYMBOL(bt_sock_stream_recvmsg);
508
bt_accept_poll(struct sock * parent)509 static 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
bt_sock_poll(struct file * file,struct socket * sock,poll_table * wait)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 }
564 EXPORT_SYMBOL(bt_sock_poll);
565
bt_sock_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)566 int 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 }
605 EXPORT_SYMBOL(bt_sock_ioctl);
606
607 /* This function expects the sk lock to be held when called */
bt_sock_wait_state(struct sock * sk,int state,unsigned long timeo)608 int 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 }
641 EXPORT_SYMBOL(bt_sock_wait_state);
642
643 /* This function expects the sk lock to be held when called */
bt_sock_wait_ready(struct sock * sk,unsigned int msg_flags)644 int 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 }
681 EXPORT_SYMBOL(bt_sock_wait_ready);
682
683 #ifdef CONFIG_PROC_FS
bt_seq_start(struct seq_file * seq,loff_t * pos)684 static 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
bt_seq_next(struct seq_file * seq,void * v,loff_t * pos)693 static 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
bt_seq_stop(struct seq_file * seq,void * v)700 static 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
bt_seq_show(struct seq_file * seq,void * v)708 static 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
745 static 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
bt_procfs_init(struct net * net,const char * name,struct bt_sock_list * sk_list,int (* seq_show)(struct seq_file *,void *))752 int 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
bt_procfs_cleanup(struct net * net,const char * name)763 void bt_procfs_cleanup(struct net *net, const char *name)
764 {
765 remove_proc_entry(name, net->proc_net);
766 }
767 #else
bt_procfs_init(struct net * net,const char * name,struct bt_sock_list * sk_list,int (* seq_show)(struct seq_file *,void *))768 int 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
bt_procfs_cleanup(struct net * net,const char * name)775 void bt_procfs_cleanup(struct net *net, const char *name)
776 {
777 }
778 #endif
779 EXPORT_SYMBOL(bt_procfs_init);
780 EXPORT_SYMBOL(bt_procfs_cleanup);
781
782 static const struct net_proto_family bt_sock_family_ops = {
783 .owner = THIS_MODULE,
784 .family = PF_BLUETOOTH,
785 .create = bt_sock_create,
786 };
787
788 struct dentry *bt_debugfs;
789 EXPORT_SYMBOL_GPL(bt_debugfs);
790
791 #define VERSION __stringify(BT_SUBSYS_VERSION) "." \
792 __stringify(BT_SUBSYS_REVISION)
793
bt_init(void)794 static 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
838 cleanup_sco:
839 sco_exit();
840 cleanup_cap:
841 l2cap_exit();
842 cleanup_socket:
843 hci_sock_cleanup();
844 unregister_socket:
845 sock_unregister(PF_BLUETOOTH);
846 cleanup_sysfs:
847 bt_sysfs_cleanup();
848 cleanup_led:
849 bt_leds_cleanup();
850 debugfs_remove_recursive(bt_debugfs);
851 return err;
852 }
853
bt_exit(void)854 static 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
875 subsys_initcall(bt_init);
876 module_exit(bt_exit);
877
878 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
879 MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
880 MODULE_VERSION(VERSION);
881 MODULE_LICENSE("GPL");
882 MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);
883