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_accept_enqueue(struct sock * parent,struct sock * sk,bool bh)188 void 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 }
225 EXPORT_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 */
bt_accept_unlink(struct sock * sk)230 void 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 }
239 EXPORT_SYMBOL(bt_accept_unlink);
240
bt_accept_dequeue(struct sock * parent,struct socket * newsock)241 struct 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
248 restart:
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 }
296 EXPORT_SYMBOL(bt_accept_dequeue);
297
bt_sock_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)298 int 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 }
351 EXPORT_SYMBOL(bt_sock_recvmsg);
352
bt_sock_data_wait(struct sock * sk,long timeo)353 static 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
bt_sock_stream_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)382 int 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
481 out:
482 release_sock(sk);
483 return copied ? : err;
484 }
485 EXPORT_SYMBOL(bt_sock_stream_recvmsg);
486
bt_accept_poll(struct sock * parent)487 static 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
bt_sock_poll(struct file * file,struct socket * sock,poll_table * wait)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 }
542 EXPORT_SYMBOL(bt_sock_poll);
543
bt_sock_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)544 int 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 }
583 EXPORT_SYMBOL(bt_sock_ioctl);
584
585 /* This function expects the sk lock to be held when called */
bt_sock_wait_state(struct sock * sk,int state,unsigned long timeo)586 int 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 }
619 EXPORT_SYMBOL(bt_sock_wait_state);
620
621 /* This function expects the sk lock to be held when called */
bt_sock_wait_ready(struct sock * sk,unsigned int msg_flags)622 int 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 }
659 EXPORT_SYMBOL(bt_sock_wait_ready);
660
661 #ifdef CONFIG_PROC_FS
bt_seq_start(struct seq_file * seq,loff_t * pos)662 static 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
bt_seq_next(struct seq_file * seq,void * v,loff_t * pos)671 static 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
bt_seq_stop(struct seq_file * seq,void * v)678 static 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
bt_seq_show(struct seq_file * seq,void * v)686 static 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
723 static 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
bt_procfs_init(struct net * net,const char * name,struct bt_sock_list * sk_list,int (* seq_show)(struct seq_file *,void *))730 int 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
bt_procfs_cleanup(struct net * net,const char * name)741 void bt_procfs_cleanup(struct net *net, const char *name)
742 {
743 remove_proc_entry(name, net->proc_net);
744 }
745 #else
bt_procfs_init(struct net * net,const char * name,struct bt_sock_list * sk_list,int (* seq_show)(struct seq_file *,void *))746 int 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
bt_procfs_cleanup(struct net * net,const char * name)753 void bt_procfs_cleanup(struct net *net, const char *name)
754 {
755 }
756 #endif
757 EXPORT_SYMBOL(bt_procfs_init);
758 EXPORT_SYMBOL(bt_procfs_cleanup);
759
760 static const struct net_proto_family bt_sock_family_ops = {
761 .owner = THIS_MODULE,
762 .family = PF_BLUETOOTH,
763 .create = bt_sock_create,
764 };
765
766 struct dentry *bt_debugfs;
767 EXPORT_SYMBOL_GPL(bt_debugfs);
768
769 #define VERSION __stringify(BT_SUBSYS_VERSION) "." \
770 __stringify(BT_SUBSYS_REVISION)
771
bt_init(void)772 static 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
816 cleanup_sco:
817 sco_exit();
818 cleanup_cap:
819 l2cap_exit();
820 cleanup_socket:
821 hci_sock_cleanup();
822 unregister_socket:
823 sock_unregister(PF_BLUETOOTH);
824 cleanup_sysfs:
825 bt_sysfs_cleanup();
826 cleanup_led:
827 bt_leds_cleanup();
828 return err;
829 }
830
bt_exit(void)831 static 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
850 subsys_initcall(bt_init);
851 module_exit(bt_exit);
852
853 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
854 MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
855 MODULE_VERSION(VERSION);
856 MODULE_LICENSE("GPL");
857 MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);
858