Loading...
1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5 Copyright (C) 2010 Google Inc.
6 Copyright (C) 2011 ProFUSION Embedded Systems
7
8 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License version 2 as
12 published by the Free Software Foundation;
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
17 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
18 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22
23 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
25 SOFTWARE IS DISCLAIMED.
26*/
27
28/* Bluetooth L2CAP sockets. */
29
30#include <linux/module.h>
31#include <linux/export.h>
32#include <linux/sched/signal.h>
33
34#include <net/bluetooth/bluetooth.h>
35#include <net/bluetooth/hci_core.h>
36#include <net/bluetooth/l2cap.h>
37
38#include "smp.h"
39
40static struct bt_sock_list l2cap_sk_list = {
41 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
42};
43
44static const struct proto_ops l2cap_sock_ops;
45static void l2cap_sock_init(struct sock *sk, struct sock *parent);
46static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
47 int proto, gfp_t prio, int kern);
48
49bool l2cap_is_socket(struct socket *sock)
50{
51 return sock && sock->ops == &l2cap_sock_ops;
52}
53EXPORT_SYMBOL(l2cap_is_socket);
54
55static int l2cap_validate_bredr_psm(u16 psm)
56{
57 /* PSM must be odd and lsb of upper byte must be 0 */
58 if ((psm & 0x0101) != 0x0001)
59 return -EINVAL;
60
61 /* Restrict usage of well-known PSMs */
62 if (psm < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE))
63 return -EACCES;
64
65 return 0;
66}
67
68static int l2cap_validate_le_psm(u16 psm)
69{
70 /* Valid LE_PSM ranges are defined only until 0x00ff */
71 if (psm > L2CAP_PSM_LE_DYN_END)
72 return -EINVAL;
73
74 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
75 if (psm < L2CAP_PSM_LE_DYN_START && !capable(CAP_NET_BIND_SERVICE))
76 return -EACCES;
77
78 return 0;
79}
80
81static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
82{
83 struct sock *sk = sock->sk;
84 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
85 struct sockaddr_l2 la;
86 int len, err = 0;
87
88 BT_DBG("sk %p", sk);
89
90 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
91 addr->sa_family != AF_BLUETOOTH)
92 return -EINVAL;
93
94 memset(&la, 0, sizeof(la));
95 len = min_t(unsigned int, sizeof(la), alen);
96 memcpy(&la, addr, len);
97
98 if (la.l2_cid && la.l2_psm)
99 return -EINVAL;
100
101 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
102 return -EINVAL;
103
104 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
105 /* We only allow ATT user space socket */
106 if (la.l2_cid &&
107 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
108 return -EINVAL;
109 }
110
111 lock_sock(sk);
112
113 if (sk->sk_state != BT_OPEN) {
114 err = -EBADFD;
115 goto done;
116 }
117
118 if (la.l2_psm) {
119 __u16 psm = __le16_to_cpu(la.l2_psm);
120
121 if (la.l2_bdaddr_type == BDADDR_BREDR)
122 err = l2cap_validate_bredr_psm(psm);
123 else
124 err = l2cap_validate_le_psm(psm);
125
126 if (err)
127 goto done;
128 }
129
130 bacpy(&chan->src, &la.l2_bdaddr);
131 chan->src_type = la.l2_bdaddr_type;
132
133 if (la.l2_cid)
134 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
135 else
136 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
137
138 if (err < 0)
139 goto done;
140
141 switch (chan->chan_type) {
142 case L2CAP_CHAN_CONN_LESS:
143 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP)
144 chan->sec_level = BT_SECURITY_SDP;
145 break;
146 case L2CAP_CHAN_CONN_ORIENTED:
147 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP ||
148 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM)
149 chan->sec_level = BT_SECURITY_SDP;
150 break;
151 case L2CAP_CHAN_RAW:
152 chan->sec_level = BT_SECURITY_SDP;
153 break;
154 case L2CAP_CHAN_FIXED:
155 /* Fixed channels default to the L2CAP core not holding a
156 * hci_conn reference for them. For fixed channels mapping to
157 * L2CAP sockets we do want to hold a reference so set the
158 * appropriate flag to request it.
159 */
160 set_bit(FLAG_HOLD_HCI_CONN, &chan->flags);
161 break;
162 }
163
164 if (chan->psm && bdaddr_type_is_le(chan->src_type))
165 chan->mode = L2CAP_MODE_LE_FLOWCTL;
166
167 chan->state = BT_BOUND;
168 sk->sk_state = BT_BOUND;
169
170done:
171 release_sock(sk);
172 return err;
173}
174
175static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
176 int alen, int flags)
177{
178 struct sock *sk = sock->sk;
179 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
180 struct sockaddr_l2 la;
181 int len, err = 0;
182
183 BT_DBG("sk %p", sk);
184
185 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
186 addr->sa_family != AF_BLUETOOTH)
187 return -EINVAL;
188
189 memset(&la, 0, sizeof(la));
190 len = min_t(unsigned int, sizeof(la), alen);
191 memcpy(&la, addr, len);
192
193 if (la.l2_cid && la.l2_psm)
194 return -EINVAL;
195
196 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
197 return -EINVAL;
198
199 /* Check that the socket wasn't bound to something that
200 * conflicts with the address given to connect(). If chan->src
201 * is BDADDR_ANY it means bind() was never used, in which case
202 * chan->src_type and la.l2_bdaddr_type do not need to match.
203 */
204 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
205 bdaddr_type_is_le(la.l2_bdaddr_type)) {
206 /* Old user space versions will try to incorrectly bind
207 * the ATT socket using BDADDR_BREDR. We need to accept
208 * this and fix up the source address type only when
209 * both the source CID and destination CID indicate
210 * ATT. Anything else is an invalid combination.
211 */
212 if (chan->scid != L2CAP_CID_ATT ||
213 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
214 return -EINVAL;
215
216 /* We don't have the hdev available here to make a
217 * better decision on random vs public, but since all
218 * user space versions that exhibit this issue anyway do
219 * not support random local addresses assuming public
220 * here is good enough.
221 */
222 chan->src_type = BDADDR_LE_PUBLIC;
223 }
224
225 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
226 return -EINVAL;
227
228 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
229 /* We only allow ATT user space socket */
230 if (la.l2_cid &&
231 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
232 return -EINVAL;
233 }
234
235 if (chan->psm && bdaddr_type_is_le(chan->src_type))
236 chan->mode = L2CAP_MODE_LE_FLOWCTL;
237
238 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
239 &la.l2_bdaddr, la.l2_bdaddr_type);
240 if (err)
241 return err;
242
243 lock_sock(sk);
244
245 err = bt_sock_wait_state(sk, BT_CONNECTED,
246 sock_sndtimeo(sk, flags & O_NONBLOCK));
247
248 release_sock(sk);
249
250 return err;
251}
252
253static int l2cap_sock_listen(struct socket *sock, int backlog)
254{
255 struct sock *sk = sock->sk;
256 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
257 int err = 0;
258
259 BT_DBG("sk %p backlog %d", sk, backlog);
260
261 lock_sock(sk);
262
263 if (sk->sk_state != BT_BOUND) {
264 err = -EBADFD;
265 goto done;
266 }
267
268 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
269 err = -EINVAL;
270 goto done;
271 }
272
273 switch (chan->mode) {
274 case L2CAP_MODE_BASIC:
275 case L2CAP_MODE_LE_FLOWCTL:
276 break;
277 case L2CAP_MODE_ERTM:
278 case L2CAP_MODE_STREAMING:
279 if (!disable_ertm)
280 break;
281 /* fall through */
282 default:
283 err = -EOPNOTSUPP;
284 goto done;
285 }
286
287 sk->sk_max_ack_backlog = backlog;
288 sk->sk_ack_backlog = 0;
289
290 /* Listening channels need to use nested locking in order not to
291 * cause lockdep warnings when the created child channels end up
292 * being locked in the same thread as the parent channel.
293 */
294 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
295
296 chan->state = BT_LISTEN;
297 sk->sk_state = BT_LISTEN;
298
299done:
300 release_sock(sk);
301 return err;
302}
303
304static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
305 int flags, bool kern)
306{
307 DEFINE_WAIT_FUNC(wait, woken_wake_function);
308 struct sock *sk = sock->sk, *nsk;
309 long timeo;
310 int err = 0;
311
312 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
313
314 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
315
316 BT_DBG("sk %p timeo %ld", sk, timeo);
317
318 /* Wait for an incoming connection. (wake-one). */
319 add_wait_queue_exclusive(sk_sleep(sk), &wait);
320 while (1) {
321 if (sk->sk_state != BT_LISTEN) {
322 err = -EBADFD;
323 break;
324 }
325
326 nsk = bt_accept_dequeue(sk, newsock);
327 if (nsk)
328 break;
329
330 if (!timeo) {
331 err = -EAGAIN;
332 break;
333 }
334
335 if (signal_pending(current)) {
336 err = sock_intr_errno(timeo);
337 break;
338 }
339
340 release_sock(sk);
341
342 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
343
344 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
345 }
346 remove_wait_queue(sk_sleep(sk), &wait);
347
348 if (err)
349 goto done;
350
351 newsock->state = SS_CONNECTED;
352
353 BT_DBG("new socket %p", nsk);
354
355done:
356 release_sock(sk);
357 return err;
358}
359
360static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
361 int peer)
362{
363 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
364 struct sock *sk = sock->sk;
365 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
366
367 BT_DBG("sock %p, sk %p", sock, sk);
368
369 if (peer && sk->sk_state != BT_CONNECTED &&
370 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 &&
371 sk->sk_state != BT_CONFIG)
372 return -ENOTCONN;
373
374 memset(la, 0, sizeof(struct sockaddr_l2));
375 addr->sa_family = AF_BLUETOOTH;
376
377 la->l2_psm = chan->psm;
378
379 if (peer) {
380 bacpy(&la->l2_bdaddr, &chan->dst);
381 la->l2_cid = cpu_to_le16(chan->dcid);
382 la->l2_bdaddr_type = chan->dst_type;
383 } else {
384 bacpy(&la->l2_bdaddr, &chan->src);
385 la->l2_cid = cpu_to_le16(chan->scid);
386 la->l2_bdaddr_type = chan->src_type;
387 }
388
389 return sizeof(struct sockaddr_l2);
390}
391
392static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
393 char __user *optval, int __user *optlen)
394{
395 struct sock *sk = sock->sk;
396 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
397 struct l2cap_options opts;
398 struct l2cap_conninfo cinfo;
399 int len, err = 0;
400 u32 opt;
401
402 BT_DBG("sk %p", sk);
403
404 if (get_user(len, optlen))
405 return -EFAULT;
406
407 lock_sock(sk);
408
409 switch (optname) {
410 case L2CAP_OPTIONS:
411 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
412 * legacy ATT code depends on getsockopt for
413 * L2CAP_OPTIONS we need to let this pass.
414 */
415 if (bdaddr_type_is_le(chan->src_type) &&
416 chan->scid != L2CAP_CID_ATT) {
417 err = -EINVAL;
418 break;
419 }
420
421 memset(&opts, 0, sizeof(opts));
422 opts.imtu = chan->imtu;
423 opts.omtu = chan->omtu;
424 opts.flush_to = chan->flush_to;
425 opts.mode = chan->mode;
426 opts.fcs = chan->fcs;
427 opts.max_tx = chan->max_tx;
428 opts.txwin_size = chan->tx_win;
429
430 len = min_t(unsigned int, len, sizeof(opts));
431 if (copy_to_user(optval, (char *) &opts, len))
432 err = -EFAULT;
433
434 break;
435
436 case L2CAP_LM:
437 switch (chan->sec_level) {
438 case BT_SECURITY_LOW:
439 opt = L2CAP_LM_AUTH;
440 break;
441 case BT_SECURITY_MEDIUM:
442 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
443 break;
444 case BT_SECURITY_HIGH:
445 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
446 L2CAP_LM_SECURE;
447 break;
448 case BT_SECURITY_FIPS:
449 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
450 L2CAP_LM_SECURE | L2CAP_LM_FIPS;
451 break;
452 default:
453 opt = 0;
454 break;
455 }
456
457 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
458 opt |= L2CAP_LM_MASTER;
459
460 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
461 opt |= L2CAP_LM_RELIABLE;
462
463 if (put_user(opt, (u32 __user *) optval))
464 err = -EFAULT;
465
466 break;
467
468 case L2CAP_CONNINFO:
469 if (sk->sk_state != BT_CONNECTED &&
470 !(sk->sk_state == BT_CONNECT2 &&
471 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
472 err = -ENOTCONN;
473 break;
474 }
475
476 memset(&cinfo, 0, sizeof(cinfo));
477 cinfo.hci_handle = chan->conn->hcon->handle;
478 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
479
480 len = min_t(unsigned int, len, sizeof(cinfo));
481 if (copy_to_user(optval, (char *) &cinfo, len))
482 err = -EFAULT;
483
484 break;
485
486 default:
487 err = -ENOPROTOOPT;
488 break;
489 }
490
491 release_sock(sk);
492 return err;
493}
494
495static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
496 char __user *optval, int __user *optlen)
497{
498 struct sock *sk = sock->sk;
499 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
500 struct bt_security sec;
501 struct bt_power pwr;
502 int len, err = 0;
503
504 BT_DBG("sk %p", sk);
505
506 if (level == SOL_L2CAP)
507 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
508
509 if (level != SOL_BLUETOOTH)
510 return -ENOPROTOOPT;
511
512 if (get_user(len, optlen))
513 return -EFAULT;
514
515 lock_sock(sk);
516
517 switch (optname) {
518 case BT_SECURITY:
519 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
520 chan->chan_type != L2CAP_CHAN_FIXED &&
521 chan->chan_type != L2CAP_CHAN_RAW) {
522 err = -EINVAL;
523 break;
524 }
525
526 memset(&sec, 0, sizeof(sec));
527 if (chan->conn) {
528 sec.level = chan->conn->hcon->sec_level;
529
530 if (sk->sk_state == BT_CONNECTED)
531 sec.key_size = chan->conn->hcon->enc_key_size;
532 } else {
533 sec.level = chan->sec_level;
534 }
535
536 len = min_t(unsigned int, len, sizeof(sec));
537 if (copy_to_user(optval, (char *) &sec, len))
538 err = -EFAULT;
539
540 break;
541
542 case BT_DEFER_SETUP:
543 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
544 err = -EINVAL;
545 break;
546 }
547
548 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
549 (u32 __user *) optval))
550 err = -EFAULT;
551
552 break;
553
554 case BT_FLUSHABLE:
555 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
556 (u32 __user *) optval))
557 err = -EFAULT;
558
559 break;
560
561 case BT_POWER:
562 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
563 && sk->sk_type != SOCK_RAW) {
564 err = -EINVAL;
565 break;
566 }
567
568 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
569
570 len = min_t(unsigned int, len, sizeof(pwr));
571 if (copy_to_user(optval, (char *) &pwr, len))
572 err = -EFAULT;
573
574 break;
575
576 case BT_CHANNEL_POLICY:
577 if (put_user(chan->chan_policy, (u32 __user *) optval))
578 err = -EFAULT;
579 break;
580
581 case BT_SNDMTU:
582 if (!bdaddr_type_is_le(chan->src_type)) {
583 err = -EINVAL;
584 break;
585 }
586
587 if (sk->sk_state != BT_CONNECTED) {
588 err = -ENOTCONN;
589 break;
590 }
591
592 if (put_user(chan->omtu, (u16 __user *) optval))
593 err = -EFAULT;
594 break;
595
596 case BT_RCVMTU:
597 if (!bdaddr_type_is_le(chan->src_type)) {
598 err = -EINVAL;
599 break;
600 }
601
602 if (put_user(chan->imtu, (u16 __user *) optval))
603 err = -EFAULT;
604 break;
605
606 default:
607 err = -ENOPROTOOPT;
608 break;
609 }
610
611 release_sock(sk);
612 return err;
613}
614
615static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
616{
617 switch (chan->scid) {
618 case L2CAP_CID_ATT:
619 if (mtu < L2CAP_LE_MIN_MTU)
620 return false;
621 break;
622
623 default:
624 if (mtu < L2CAP_DEFAULT_MIN_MTU)
625 return false;
626 }
627
628 return true;
629}
630
631static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
632 char __user *optval, unsigned int optlen)
633{
634 struct sock *sk = sock->sk;
635 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
636 struct l2cap_options opts;
637 int len, err = 0;
638 u32 opt;
639
640 BT_DBG("sk %p", sk);
641
642 lock_sock(sk);
643
644 switch (optname) {
645 case L2CAP_OPTIONS:
646 if (bdaddr_type_is_le(chan->src_type)) {
647 err = -EINVAL;
648 break;
649 }
650
651 if (sk->sk_state == BT_CONNECTED) {
652 err = -EINVAL;
653 break;
654 }
655
656 opts.imtu = chan->imtu;
657 opts.omtu = chan->omtu;
658 opts.flush_to = chan->flush_to;
659 opts.mode = chan->mode;
660 opts.fcs = chan->fcs;
661 opts.max_tx = chan->max_tx;
662 opts.txwin_size = chan->tx_win;
663
664 len = min_t(unsigned int, sizeof(opts), optlen);
665 if (copy_from_user((char *) &opts, optval, len)) {
666 err = -EFAULT;
667 break;
668 }
669
670 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
671 err = -EINVAL;
672 break;
673 }
674
675 if (!l2cap_valid_mtu(chan, opts.imtu)) {
676 err = -EINVAL;
677 break;
678 }
679
680 chan->mode = opts.mode;
681 switch (chan->mode) {
682 case L2CAP_MODE_LE_FLOWCTL:
683 break;
684 case L2CAP_MODE_BASIC:
685 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
686 break;
687 case L2CAP_MODE_ERTM:
688 case L2CAP_MODE_STREAMING:
689 if (!disable_ertm)
690 break;
691 /* fall through */
692 default:
693 err = -EINVAL;
694 break;
695 }
696
697 chan->imtu = opts.imtu;
698 chan->omtu = opts.omtu;
699 chan->fcs = opts.fcs;
700 chan->max_tx = opts.max_tx;
701 chan->tx_win = opts.txwin_size;
702 chan->flush_to = opts.flush_to;
703 break;
704
705 case L2CAP_LM:
706 if (get_user(opt, (u32 __user *) optval)) {
707 err = -EFAULT;
708 break;
709 }
710
711 if (opt & L2CAP_LM_FIPS) {
712 err = -EINVAL;
713 break;
714 }
715
716 if (opt & L2CAP_LM_AUTH)
717 chan->sec_level = BT_SECURITY_LOW;
718 if (opt & L2CAP_LM_ENCRYPT)
719 chan->sec_level = BT_SECURITY_MEDIUM;
720 if (opt & L2CAP_LM_SECURE)
721 chan->sec_level = BT_SECURITY_HIGH;
722
723 if (opt & L2CAP_LM_MASTER)
724 set_bit(FLAG_ROLE_SWITCH, &chan->flags);
725 else
726 clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
727
728 if (opt & L2CAP_LM_RELIABLE)
729 set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
730 else
731 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
732 break;
733
734 default:
735 err = -ENOPROTOOPT;
736 break;
737 }
738
739 release_sock(sk);
740 return err;
741}
742
743static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
744 char __user *optval, unsigned int optlen)
745{
746 struct sock *sk = sock->sk;
747 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
748 struct bt_security sec;
749 struct bt_power pwr;
750 struct l2cap_conn *conn;
751 int len, err = 0;
752 u32 opt;
753
754 BT_DBG("sk %p", sk);
755
756 if (level == SOL_L2CAP)
757 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
758
759 if (level != SOL_BLUETOOTH)
760 return -ENOPROTOOPT;
761
762 lock_sock(sk);
763
764 switch (optname) {
765 case BT_SECURITY:
766 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
767 chan->chan_type != L2CAP_CHAN_FIXED &&
768 chan->chan_type != L2CAP_CHAN_RAW) {
769 err = -EINVAL;
770 break;
771 }
772
773 sec.level = BT_SECURITY_LOW;
774
775 len = min_t(unsigned int, sizeof(sec), optlen);
776 if (copy_from_user((char *) &sec, optval, len)) {
777 err = -EFAULT;
778 break;
779 }
780
781 if (sec.level < BT_SECURITY_LOW ||
782 sec.level > BT_SECURITY_FIPS) {
783 err = -EINVAL;
784 break;
785 }
786
787 chan->sec_level = sec.level;
788
789 if (!chan->conn)
790 break;
791
792 conn = chan->conn;
793
794 /* change security for LE channels */
795 if (chan->scid == L2CAP_CID_ATT) {
796 if (smp_conn_security(conn->hcon, sec.level)) {
797 err = -EINVAL;
798 break;
799 }
800
801 set_bit(FLAG_PENDING_SECURITY, &chan->flags);
802 sk->sk_state = BT_CONFIG;
803 chan->state = BT_CONFIG;
804
805 /* or for ACL link */
806 } else if ((sk->sk_state == BT_CONNECT2 &&
807 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
808 sk->sk_state == BT_CONNECTED) {
809 if (!l2cap_chan_check_security(chan, true))
810 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
811 else
812 sk->sk_state_change(sk);
813 } else {
814 err = -EINVAL;
815 }
816 break;
817
818 case BT_DEFER_SETUP:
819 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
820 err = -EINVAL;
821 break;
822 }
823
824 if (get_user(opt, (u32 __user *) optval)) {
825 err = -EFAULT;
826 break;
827 }
828
829 if (opt) {
830 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
831 set_bit(FLAG_DEFER_SETUP, &chan->flags);
832 } else {
833 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
834 clear_bit(FLAG_DEFER_SETUP, &chan->flags);
835 }
836 break;
837
838 case BT_FLUSHABLE:
839 if (get_user(opt, (u32 __user *) optval)) {
840 err = -EFAULT;
841 break;
842 }
843
844 if (opt > BT_FLUSHABLE_ON) {
845 err = -EINVAL;
846 break;
847 }
848
849 if (opt == BT_FLUSHABLE_OFF) {
850 conn = chan->conn;
851 /* proceed further only when we have l2cap_conn and
852 No Flush support in the LM */
853 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
854 err = -EINVAL;
855 break;
856 }
857 }
858
859 if (opt)
860 set_bit(FLAG_FLUSHABLE, &chan->flags);
861 else
862 clear_bit(FLAG_FLUSHABLE, &chan->flags);
863 break;
864
865 case BT_POWER:
866 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
867 chan->chan_type != L2CAP_CHAN_RAW) {
868 err = -EINVAL;
869 break;
870 }
871
872 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
873
874 len = min_t(unsigned int, sizeof(pwr), optlen);
875 if (copy_from_user((char *) &pwr, optval, len)) {
876 err = -EFAULT;
877 break;
878 }
879
880 if (pwr.force_active)
881 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
882 else
883 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
884 break;
885
886 case BT_CHANNEL_POLICY:
887 if (get_user(opt, (u32 __user *) optval)) {
888 err = -EFAULT;
889 break;
890 }
891
892 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
893 err = -EINVAL;
894 break;
895 }
896
897 if (chan->mode != L2CAP_MODE_ERTM &&
898 chan->mode != L2CAP_MODE_STREAMING) {
899 err = -EOPNOTSUPP;
900 break;
901 }
902
903 chan->chan_policy = (u8) opt;
904
905 if (sk->sk_state == BT_CONNECTED &&
906 chan->move_role == L2CAP_MOVE_ROLE_NONE)
907 l2cap_move_start(chan);
908
909 break;
910
911 case BT_SNDMTU:
912 if (!bdaddr_type_is_le(chan->src_type)) {
913 err = -EINVAL;
914 break;
915 }
916
917 /* Setting is not supported as it's the remote side that
918 * decides this.
919 */
920 err = -EPERM;
921 break;
922
923 case BT_RCVMTU:
924 if (!bdaddr_type_is_le(chan->src_type)) {
925 err = -EINVAL;
926 break;
927 }
928
929 if (sk->sk_state == BT_CONNECTED) {
930 err = -EISCONN;
931 break;
932 }
933
934 if (get_user(opt, (u16 __user *) optval)) {
935 err = -EFAULT;
936 break;
937 }
938
939 chan->imtu = opt;
940 break;
941
942 default:
943 err = -ENOPROTOOPT;
944 break;
945 }
946
947 release_sock(sk);
948 return err;
949}
950
951static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg,
952 size_t len)
953{
954 struct sock *sk = sock->sk;
955 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
956 int err;
957
958 BT_DBG("sock %p, sk %p", sock, sk);
959
960 err = sock_error(sk);
961 if (err)
962 return err;
963
964 if (msg->msg_flags & MSG_OOB)
965 return -EOPNOTSUPP;
966
967 if (sk->sk_state != BT_CONNECTED)
968 return -ENOTCONN;
969
970 lock_sock(sk);
971 err = bt_sock_wait_ready(sk, msg->msg_flags);
972 release_sock(sk);
973 if (err)
974 return err;
975
976 l2cap_chan_lock(chan);
977 err = l2cap_chan_send(chan, msg, len);
978 l2cap_chan_unlock(chan);
979
980 return err;
981}
982
983static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg,
984 size_t len, int flags)
985{
986 struct sock *sk = sock->sk;
987 struct l2cap_pinfo *pi = l2cap_pi(sk);
988 int err;
989
990 lock_sock(sk);
991
992 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
993 &bt_sk(sk)->flags)) {
994 if (bdaddr_type_is_le(pi->chan->src_type)) {
995 sk->sk_state = BT_CONNECTED;
996 pi->chan->state = BT_CONNECTED;
997 __l2cap_le_connect_rsp_defer(pi->chan);
998 } else {
999 sk->sk_state = BT_CONFIG;
1000 pi->chan->state = BT_CONFIG;
1001 __l2cap_connect_rsp_defer(pi->chan);
1002 }
1003
1004 err = 0;
1005 goto done;
1006 }
1007
1008 release_sock(sk);
1009
1010 if (sock->type == SOCK_STREAM)
1011 err = bt_sock_stream_recvmsg(sock, msg, len, flags);
1012 else
1013 err = bt_sock_recvmsg(sock, msg, len, flags);
1014
1015 if (pi->chan->mode != L2CAP_MODE_ERTM)
1016 return err;
1017
1018 /* Attempt to put pending rx data in the socket buffer */
1019
1020 lock_sock(sk);
1021
1022 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
1023 goto done;
1024
1025 if (pi->rx_busy_skb) {
1026 if (!__sock_queue_rcv_skb(sk, pi->rx_busy_skb))
1027 pi->rx_busy_skb = NULL;
1028 else
1029 goto done;
1030 }
1031
1032 /* Restore data flow when half of the receive buffer is
1033 * available. This avoids resending large numbers of
1034 * frames.
1035 */
1036 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1037 l2cap_chan_busy(pi->chan, 0);
1038
1039done:
1040 release_sock(sk);
1041 return err;
1042}
1043
1044/* Kill socket (only if zapped and orphan)
1045 * Must be called on unlocked socket.
1046 */
1047static void l2cap_sock_kill(struct sock *sk)
1048{
1049 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1050 return;
1051
1052 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
1053
1054 /* Kill poor orphan */
1055
1056 l2cap_chan_put(l2cap_pi(sk)->chan);
1057 sock_set_flag(sk, SOCK_DEAD);
1058 sock_put(sk);
1059}
1060
1061static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
1062{
1063 DECLARE_WAITQUEUE(wait, current);
1064 int err = 0;
1065 int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1066 /* Timeout to prevent infinite loop */
1067 unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
1068
1069 add_wait_queue(sk_sleep(sk), &wait);
1070 set_current_state(TASK_INTERRUPTIBLE);
1071 do {
1072 BT_DBG("Waiting for %d ACKs, timeout %04d ms",
1073 chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
1074 jiffies_to_msecs(timeout - jiffies));
1075
1076 if (!timeo)
1077 timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1078
1079 if (signal_pending(current)) {
1080 err = sock_intr_errno(timeo);
1081 break;
1082 }
1083
1084 release_sock(sk);
1085 timeo = schedule_timeout(timeo);
1086 lock_sock(sk);
1087 set_current_state(TASK_INTERRUPTIBLE);
1088
1089 err = sock_error(sk);
1090 if (err)
1091 break;
1092
1093 if (time_after(jiffies, timeout)) {
1094 err = -ENOLINK;
1095 break;
1096 }
1097
1098 } while (chan->unacked_frames > 0 &&
1099 chan->state == BT_CONNECTED);
1100
1101 set_current_state(TASK_RUNNING);
1102 remove_wait_queue(sk_sleep(sk), &wait);
1103 return err;
1104}
1105
1106static int l2cap_sock_shutdown(struct socket *sock, int how)
1107{
1108 struct sock *sk = sock->sk;
1109 struct l2cap_chan *chan;
1110 struct l2cap_conn *conn;
1111 int err = 0;
1112
1113 BT_DBG("sock %p, sk %p", sock, sk);
1114
1115 if (!sk)
1116 return 0;
1117
1118 lock_sock(sk);
1119
1120 if (sk->sk_shutdown)
1121 goto shutdown_already;
1122
1123 BT_DBG("Handling sock shutdown");
1124
1125 /* prevent sk structure from being freed whilst unlocked */
1126 sock_hold(sk);
1127
1128 chan = l2cap_pi(sk)->chan;
1129 /* prevent chan structure from being freed whilst unlocked */
1130 l2cap_chan_hold(chan);
1131
1132 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1133
1134 if (chan->mode == L2CAP_MODE_ERTM &&
1135 chan->unacked_frames > 0 &&
1136 chan->state == BT_CONNECTED) {
1137 err = __l2cap_wait_ack(sk, chan);
1138
1139 /* After waiting for ACKs, check whether shutdown
1140 * has already been actioned to close the L2CAP
1141 * link such as by l2cap_disconnection_req().
1142 */
1143 if (sk->sk_shutdown)
1144 goto has_shutdown;
1145 }
1146
1147 sk->sk_shutdown = SHUTDOWN_MASK;
1148 release_sock(sk);
1149
1150 l2cap_chan_lock(chan);
1151 conn = chan->conn;
1152 if (conn)
1153 /* prevent conn structure from being freed */
1154 l2cap_conn_get(conn);
1155 l2cap_chan_unlock(chan);
1156
1157 if (conn)
1158 /* mutex lock must be taken before l2cap_chan_lock() */
1159 mutex_lock(&conn->chan_lock);
1160
1161 l2cap_chan_lock(chan);
1162 l2cap_chan_close(chan, 0);
1163 l2cap_chan_unlock(chan);
1164
1165 if (conn) {
1166 mutex_unlock(&conn->chan_lock);
1167 l2cap_conn_put(conn);
1168 }
1169
1170 lock_sock(sk);
1171
1172 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1173 !(current->flags & PF_EXITING))
1174 err = bt_sock_wait_state(sk, BT_CLOSED,
1175 sk->sk_lingertime);
1176
1177has_shutdown:
1178 l2cap_chan_put(chan);
1179 sock_put(sk);
1180
1181shutdown_already:
1182 if (!err && sk->sk_err)
1183 err = -sk->sk_err;
1184
1185 release_sock(sk);
1186
1187 BT_DBG("Sock shutdown complete err: %d", err);
1188
1189 return err;
1190}
1191
1192static int l2cap_sock_release(struct socket *sock)
1193{
1194 struct sock *sk = sock->sk;
1195 int err;
1196
1197 BT_DBG("sock %p, sk %p", sock, sk);
1198
1199 if (!sk)
1200 return 0;
1201
1202 bt_sock_unlink(&l2cap_sk_list, sk);
1203
1204 err = l2cap_sock_shutdown(sock, 2);
1205
1206 sock_orphan(sk);
1207 l2cap_sock_kill(sk);
1208 return err;
1209}
1210
1211static void l2cap_sock_cleanup_listen(struct sock *parent)
1212{
1213 struct sock *sk;
1214
1215 BT_DBG("parent %p state %s", parent,
1216 state_to_string(parent->sk_state));
1217
1218 /* Close not yet accepted channels */
1219 while ((sk = bt_accept_dequeue(parent, NULL))) {
1220 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1221
1222 BT_DBG("child chan %p state %s", chan,
1223 state_to_string(chan->state));
1224
1225 l2cap_chan_lock(chan);
1226 __clear_chan_timer(chan);
1227 l2cap_chan_close(chan, ECONNRESET);
1228 l2cap_chan_unlock(chan);
1229
1230 l2cap_sock_kill(sk);
1231 }
1232}
1233
1234static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1235{
1236 struct sock *sk, *parent = chan->data;
1237
1238 lock_sock(parent);
1239
1240 /* Check for backlog size */
1241 if (sk_acceptq_is_full(parent)) {
1242 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1243 release_sock(parent);
1244 return NULL;
1245 }
1246
1247 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1248 GFP_ATOMIC, 0);
1249 if (!sk) {
1250 release_sock(parent);
1251 return NULL;
1252 }
1253
1254 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1255
1256 l2cap_sock_init(sk, parent);
1257
1258 bt_accept_enqueue(parent, sk, false);
1259
1260 release_sock(parent);
1261
1262 return l2cap_pi(sk)->chan;
1263}
1264
1265static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1266{
1267 struct sock *sk = chan->data;
1268 int err;
1269
1270 lock_sock(sk);
1271
1272 if (l2cap_pi(sk)->rx_busy_skb) {
1273 err = -ENOMEM;
1274 goto done;
1275 }
1276
1277 if (chan->mode != L2CAP_MODE_ERTM &&
1278 chan->mode != L2CAP_MODE_STREAMING) {
1279 /* Even if no filter is attached, we could potentially
1280 * get errors from security modules, etc.
1281 */
1282 err = sk_filter(sk, skb);
1283 if (err)
1284 goto done;
1285 }
1286
1287 err = __sock_queue_rcv_skb(sk, skb);
1288
1289 /* For ERTM, handle one skb that doesn't fit into the recv
1290 * buffer. This is important to do because the data frames
1291 * have already been acked, so the skb cannot be discarded.
1292 *
1293 * Notify the l2cap core that the buffer is full, so the
1294 * LOCAL_BUSY state is entered and no more frames are
1295 * acked and reassembled until there is buffer space
1296 * available.
1297 */
1298 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1299 l2cap_pi(sk)->rx_busy_skb = skb;
1300 l2cap_chan_busy(chan, 1);
1301 err = 0;
1302 }
1303
1304done:
1305 release_sock(sk);
1306
1307 return err;
1308}
1309
1310static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1311{
1312 struct sock *sk = chan->data;
1313
1314 l2cap_sock_kill(sk);
1315}
1316
1317static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1318{
1319 struct sock *sk = chan->data;
1320 struct sock *parent;
1321
1322 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1323
1324 /* This callback can be called both for server (BT_LISTEN)
1325 * sockets as well as "normal" ones. To avoid lockdep warnings
1326 * with child socket locking (through l2cap_sock_cleanup_listen)
1327 * we need separation into separate nesting levels. The simplest
1328 * way to accomplish this is to inherit the nesting level used
1329 * for the channel.
1330 */
1331 lock_sock_nested(sk, atomic_read(&chan->nesting));
1332
1333 parent = bt_sk(sk)->parent;
1334
1335 sock_set_flag(sk, SOCK_ZAPPED);
1336
1337 switch (chan->state) {
1338 case BT_OPEN:
1339 case BT_BOUND:
1340 case BT_CLOSED:
1341 break;
1342 case BT_LISTEN:
1343 l2cap_sock_cleanup_listen(sk);
1344 sk->sk_state = BT_CLOSED;
1345 chan->state = BT_CLOSED;
1346
1347 break;
1348 default:
1349 sk->sk_state = BT_CLOSED;
1350 chan->state = BT_CLOSED;
1351
1352 sk->sk_err = err;
1353
1354 if (parent) {
1355 bt_accept_unlink(sk);
1356 parent->sk_data_ready(parent);
1357 } else {
1358 sk->sk_state_change(sk);
1359 }
1360
1361 break;
1362 }
1363
1364 release_sock(sk);
1365}
1366
1367static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1368 int err)
1369{
1370 struct sock *sk = chan->data;
1371
1372 sk->sk_state = state;
1373
1374 if (err)
1375 sk->sk_err = err;
1376}
1377
1378static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1379 unsigned long hdr_len,
1380 unsigned long len, int nb)
1381{
1382 struct sock *sk = chan->data;
1383 struct sk_buff *skb;
1384 int err;
1385
1386 l2cap_chan_unlock(chan);
1387 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1388 l2cap_chan_lock(chan);
1389
1390 if (!skb)
1391 return ERR_PTR(err);
1392
1393 skb->priority = sk->sk_priority;
1394
1395 bt_cb(skb)->l2cap.chan = chan;
1396
1397 return skb;
1398}
1399
1400static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1401{
1402 struct sock *sk = chan->data;
1403 struct sock *parent;
1404
1405 lock_sock(sk);
1406
1407 parent = bt_sk(sk)->parent;
1408
1409 BT_DBG("sk %p, parent %p", sk, parent);
1410
1411 sk->sk_state = BT_CONNECTED;
1412 sk->sk_state_change(sk);
1413
1414 if (parent)
1415 parent->sk_data_ready(parent);
1416
1417 release_sock(sk);
1418}
1419
1420static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1421{
1422 struct sock *parent, *sk = chan->data;
1423
1424 lock_sock(sk);
1425
1426 parent = bt_sk(sk)->parent;
1427 if (parent)
1428 parent->sk_data_ready(parent);
1429
1430 release_sock(sk);
1431}
1432
1433static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1434{
1435 struct sock *sk = chan->data;
1436
1437 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1438 sk->sk_state = BT_CONNECTED;
1439 chan->state = BT_CONNECTED;
1440 }
1441
1442 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1443 sk->sk_state_change(sk);
1444}
1445
1446static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1447{
1448 struct sock *sk = chan->data;
1449
1450 lock_sock(sk);
1451 sk->sk_shutdown = SHUTDOWN_MASK;
1452 release_sock(sk);
1453}
1454
1455static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1456{
1457 struct sock *sk = chan->data;
1458
1459 return sk->sk_sndtimeo;
1460}
1461
1462static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1463{
1464 struct sock *sk = chan->data;
1465
1466 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1467 sk->sk_state_change(sk);
1468}
1469
1470static const struct l2cap_ops l2cap_chan_ops = {
1471 .name = "L2CAP Socket Interface",
1472 .new_connection = l2cap_sock_new_connection_cb,
1473 .recv = l2cap_sock_recv_cb,
1474 .close = l2cap_sock_close_cb,
1475 .teardown = l2cap_sock_teardown_cb,
1476 .state_change = l2cap_sock_state_change_cb,
1477 .ready = l2cap_sock_ready_cb,
1478 .defer = l2cap_sock_defer_cb,
1479 .resume = l2cap_sock_resume_cb,
1480 .suspend = l2cap_sock_suspend_cb,
1481 .set_shutdown = l2cap_sock_set_shutdown_cb,
1482 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1483 .alloc_skb = l2cap_sock_alloc_skb_cb,
1484};
1485
1486static void l2cap_sock_destruct(struct sock *sk)
1487{
1488 BT_DBG("sk %p", sk);
1489
1490 if (l2cap_pi(sk)->chan)
1491 l2cap_chan_put(l2cap_pi(sk)->chan);
1492
1493 if (l2cap_pi(sk)->rx_busy_skb) {
1494 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1495 l2cap_pi(sk)->rx_busy_skb = NULL;
1496 }
1497
1498 skb_queue_purge(&sk->sk_receive_queue);
1499 skb_queue_purge(&sk->sk_write_queue);
1500}
1501
1502static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1503 int *msg_namelen)
1504{
1505 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1506
1507 memset(la, 0, sizeof(struct sockaddr_l2));
1508 la->l2_family = AF_BLUETOOTH;
1509 la->l2_psm = bt_cb(skb)->l2cap.psm;
1510 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr);
1511
1512 *msg_namelen = sizeof(struct sockaddr_l2);
1513}
1514
1515static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1516{
1517 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1518
1519 BT_DBG("sk %p", sk);
1520
1521 if (parent) {
1522 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1523
1524 sk->sk_type = parent->sk_type;
1525 bt_sk(sk)->flags = bt_sk(parent)->flags;
1526
1527 chan->chan_type = pchan->chan_type;
1528 chan->imtu = pchan->imtu;
1529 chan->omtu = pchan->omtu;
1530 chan->conf_state = pchan->conf_state;
1531 chan->mode = pchan->mode;
1532 chan->fcs = pchan->fcs;
1533 chan->max_tx = pchan->max_tx;
1534 chan->tx_win = pchan->tx_win;
1535 chan->tx_win_max = pchan->tx_win_max;
1536 chan->sec_level = pchan->sec_level;
1537 chan->flags = pchan->flags;
1538 chan->tx_credits = pchan->tx_credits;
1539 chan->rx_credits = pchan->rx_credits;
1540
1541 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1542 chan->scid = pchan->scid;
1543 chan->dcid = pchan->scid;
1544 }
1545
1546 security_sk_clone(parent, sk);
1547 } else {
1548 switch (sk->sk_type) {
1549 case SOCK_RAW:
1550 chan->chan_type = L2CAP_CHAN_RAW;
1551 break;
1552 case SOCK_DGRAM:
1553 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1554 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1555 break;
1556 case SOCK_SEQPACKET:
1557 case SOCK_STREAM:
1558 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1559 break;
1560 }
1561
1562 chan->imtu = L2CAP_DEFAULT_MTU;
1563 chan->omtu = 0;
1564 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1565 chan->mode = L2CAP_MODE_ERTM;
1566 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1567 } else {
1568 chan->mode = L2CAP_MODE_BASIC;
1569 }
1570
1571 l2cap_chan_set_defaults(chan);
1572 }
1573
1574 /* Default config options */
1575 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1576
1577 chan->data = sk;
1578 chan->ops = &l2cap_chan_ops;
1579}
1580
1581static struct proto l2cap_proto = {
1582 .name = "L2CAP",
1583 .owner = THIS_MODULE,
1584 .obj_size = sizeof(struct l2cap_pinfo)
1585};
1586
1587static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1588 int proto, gfp_t prio, int kern)
1589{
1590 struct sock *sk;
1591 struct l2cap_chan *chan;
1592
1593 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, kern);
1594 if (!sk)
1595 return NULL;
1596
1597 sock_init_data(sock, sk);
1598 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1599
1600 sk->sk_destruct = l2cap_sock_destruct;
1601 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1602
1603 sock_reset_flag(sk, SOCK_ZAPPED);
1604
1605 sk->sk_protocol = proto;
1606 sk->sk_state = BT_OPEN;
1607
1608 chan = l2cap_chan_create();
1609 if (!chan) {
1610 sk_free(sk);
1611 return NULL;
1612 }
1613
1614 l2cap_chan_hold(chan);
1615
1616 l2cap_pi(sk)->chan = chan;
1617
1618 return sk;
1619}
1620
1621static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1622 int kern)
1623{
1624 struct sock *sk;
1625
1626 BT_DBG("sock %p", sock);
1627
1628 sock->state = SS_UNCONNECTED;
1629
1630 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1631 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1632 return -ESOCKTNOSUPPORT;
1633
1634 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1635 return -EPERM;
1636
1637 sock->ops = &l2cap_sock_ops;
1638
1639 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
1640 if (!sk)
1641 return -ENOMEM;
1642
1643 l2cap_sock_init(sk, NULL);
1644 bt_sock_link(&l2cap_sk_list, sk);
1645 return 0;
1646}
1647
1648static const struct proto_ops l2cap_sock_ops = {
1649 .family = PF_BLUETOOTH,
1650 .owner = THIS_MODULE,
1651 .release = l2cap_sock_release,
1652 .bind = l2cap_sock_bind,
1653 .connect = l2cap_sock_connect,
1654 .listen = l2cap_sock_listen,
1655 .accept = l2cap_sock_accept,
1656 .getname = l2cap_sock_getname,
1657 .sendmsg = l2cap_sock_sendmsg,
1658 .recvmsg = l2cap_sock_recvmsg,
1659 .poll = bt_sock_poll,
1660 .ioctl = bt_sock_ioctl,
1661 .gettstamp = sock_gettstamp,
1662 .mmap = sock_no_mmap,
1663 .socketpair = sock_no_socketpair,
1664 .shutdown = l2cap_sock_shutdown,
1665 .setsockopt = l2cap_sock_setsockopt,
1666 .getsockopt = l2cap_sock_getsockopt
1667};
1668
1669static const struct net_proto_family l2cap_sock_family_ops = {
1670 .family = PF_BLUETOOTH,
1671 .owner = THIS_MODULE,
1672 .create = l2cap_sock_create,
1673};
1674
1675int __init l2cap_init_sockets(void)
1676{
1677 int err;
1678
1679 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1680
1681 err = proto_register(&l2cap_proto, 0);
1682 if (err < 0)
1683 return err;
1684
1685 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1686 if (err < 0) {
1687 BT_ERR("L2CAP socket registration failed");
1688 goto error;
1689 }
1690
1691 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1692 NULL);
1693 if (err < 0) {
1694 BT_ERR("Failed to create L2CAP proc file");
1695 bt_sock_unregister(BTPROTO_L2CAP);
1696 goto error;
1697 }
1698
1699 BT_INFO("L2CAP socket layer initialized");
1700
1701 return 0;
1702
1703error:
1704 proto_unregister(&l2cap_proto);
1705 return err;
1706}
1707
1708void l2cap_cleanup_sockets(void)
1709{
1710 bt_procfs_cleanup(&init_net, "l2cap");
1711 bt_sock_unregister(BTPROTO_L2CAP);
1712 proto_unregister(&l2cap_proto);
1713}
1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5 Copyright (C) 2010 Google Inc.
6 Copyright (C) 2011 ProFUSION Embedded Systems
7
8 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License version 2 as
12 published by the Free Software Foundation;
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
17 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
18 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22
23 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
25 SOFTWARE IS DISCLAIMED.
26*/
27
28/* Bluetooth L2CAP sockets. */
29
30#include <linux/module.h>
31#include <linux/export.h>
32#include <linux/filter.h>
33#include <linux/sched/signal.h>
34
35#include <net/bluetooth/bluetooth.h>
36#include <net/bluetooth/hci_core.h>
37#include <net/bluetooth/l2cap.h>
38
39#include "smp.h"
40
41static struct bt_sock_list l2cap_sk_list = {
42 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
43};
44
45static const struct proto_ops l2cap_sock_ops;
46static void l2cap_sock_init(struct sock *sk, struct sock *parent);
47static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
48 int proto, gfp_t prio, int kern);
49static void l2cap_sock_cleanup_listen(struct sock *parent);
50
51bool l2cap_is_socket(struct socket *sock)
52{
53 return sock && sock->ops == &l2cap_sock_ops;
54}
55EXPORT_SYMBOL(l2cap_is_socket);
56
57static int l2cap_validate_bredr_psm(u16 psm)
58{
59 /* PSM must be odd and lsb of upper byte must be 0 */
60 if ((psm & 0x0101) != 0x0001)
61 return -EINVAL;
62
63 /* Restrict usage of well-known PSMs */
64 if (psm < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE))
65 return -EACCES;
66
67 return 0;
68}
69
70static int l2cap_validate_le_psm(u16 psm)
71{
72 /* Valid LE_PSM ranges are defined only until 0x00ff */
73 if (psm > L2CAP_PSM_LE_DYN_END)
74 return -EINVAL;
75
76 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
77 if (psm < L2CAP_PSM_LE_DYN_START && !capable(CAP_NET_BIND_SERVICE))
78 return -EACCES;
79
80 return 0;
81}
82
83static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
84{
85 struct sock *sk = sock->sk;
86 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
87 struct sockaddr_l2 la;
88 int len, err = 0;
89
90 BT_DBG("sk %p", sk);
91
92 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
93 addr->sa_family != AF_BLUETOOTH)
94 return -EINVAL;
95
96 memset(&la, 0, sizeof(la));
97 len = min_t(unsigned int, sizeof(la), alen);
98 memcpy(&la, addr, len);
99
100 if (la.l2_cid && la.l2_psm)
101 return -EINVAL;
102
103 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
104 return -EINVAL;
105
106 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
107 /* We only allow ATT user space socket */
108 if (la.l2_cid &&
109 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
110 return -EINVAL;
111 }
112
113 lock_sock(sk);
114
115 if (sk->sk_state != BT_OPEN) {
116 err = -EBADFD;
117 goto done;
118 }
119
120 if (la.l2_psm) {
121 __u16 psm = __le16_to_cpu(la.l2_psm);
122
123 if (la.l2_bdaddr_type == BDADDR_BREDR)
124 err = l2cap_validate_bredr_psm(psm);
125 else
126 err = l2cap_validate_le_psm(psm);
127
128 if (err)
129 goto done;
130 }
131
132 bacpy(&chan->src, &la.l2_bdaddr);
133 chan->src_type = la.l2_bdaddr_type;
134
135 if (la.l2_cid)
136 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
137 else
138 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
139
140 if (err < 0)
141 goto done;
142
143 switch (chan->chan_type) {
144 case L2CAP_CHAN_CONN_LESS:
145 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP)
146 chan->sec_level = BT_SECURITY_SDP;
147 break;
148 case L2CAP_CHAN_CONN_ORIENTED:
149 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP ||
150 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM)
151 chan->sec_level = BT_SECURITY_SDP;
152 break;
153 case L2CAP_CHAN_RAW:
154 chan->sec_level = BT_SECURITY_SDP;
155 break;
156 case L2CAP_CHAN_FIXED:
157 /* Fixed channels default to the L2CAP core not holding a
158 * hci_conn reference for them. For fixed channels mapping to
159 * L2CAP sockets we do want to hold a reference so set the
160 * appropriate flag to request it.
161 */
162 set_bit(FLAG_HOLD_HCI_CONN, &chan->flags);
163 break;
164 }
165
166 /* Use L2CAP_MODE_LE_FLOWCTL (CoC) in case of LE address and
167 * L2CAP_MODE_EXT_FLOWCTL (ECRED) has not been set.
168 */
169 if (chan->psm && bdaddr_type_is_le(chan->src_type) &&
170 chan->mode != L2CAP_MODE_EXT_FLOWCTL)
171 chan->mode = L2CAP_MODE_LE_FLOWCTL;
172
173 chan->state = BT_BOUND;
174 sk->sk_state = BT_BOUND;
175
176done:
177 release_sock(sk);
178 return err;
179}
180
181static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
182 int alen, int flags)
183{
184 struct sock *sk = sock->sk;
185 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
186 struct sockaddr_l2 la;
187 int len, err = 0;
188 bool zapped;
189
190 BT_DBG("sk %p", sk);
191
192 lock_sock(sk);
193 zapped = sock_flag(sk, SOCK_ZAPPED);
194 release_sock(sk);
195
196 if (zapped)
197 return -EINVAL;
198
199 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
200 addr->sa_family != AF_BLUETOOTH)
201 return -EINVAL;
202
203 memset(&la, 0, sizeof(la));
204 len = min_t(unsigned int, sizeof(la), alen);
205 memcpy(&la, addr, len);
206
207 if (la.l2_cid && la.l2_psm)
208 return -EINVAL;
209
210 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
211 return -EINVAL;
212
213 /* Check that the socket wasn't bound to something that
214 * conflicts with the address given to connect(). If chan->src
215 * is BDADDR_ANY it means bind() was never used, in which case
216 * chan->src_type and la.l2_bdaddr_type do not need to match.
217 */
218 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
219 bdaddr_type_is_le(la.l2_bdaddr_type)) {
220 /* Old user space versions will try to incorrectly bind
221 * the ATT socket using BDADDR_BREDR. We need to accept
222 * this and fix up the source address type only when
223 * both the source CID and destination CID indicate
224 * ATT. Anything else is an invalid combination.
225 */
226 if (chan->scid != L2CAP_CID_ATT ||
227 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
228 return -EINVAL;
229
230 /* We don't have the hdev available here to make a
231 * better decision on random vs public, but since all
232 * user space versions that exhibit this issue anyway do
233 * not support random local addresses assuming public
234 * here is good enough.
235 */
236 chan->src_type = BDADDR_LE_PUBLIC;
237 }
238
239 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
240 return -EINVAL;
241
242 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
243 /* We only allow ATT user space socket */
244 if (la.l2_cid &&
245 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
246 return -EINVAL;
247 }
248
249 /* Use L2CAP_MODE_LE_FLOWCTL (CoC) in case of LE address and
250 * L2CAP_MODE_EXT_FLOWCTL (ECRED) has not been set.
251 */
252 if (chan->psm && bdaddr_type_is_le(chan->src_type) &&
253 chan->mode != L2CAP_MODE_EXT_FLOWCTL)
254 chan->mode = L2CAP_MODE_LE_FLOWCTL;
255
256 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
257 &la.l2_bdaddr, la.l2_bdaddr_type);
258 if (err)
259 return err;
260
261 lock_sock(sk);
262
263 err = bt_sock_wait_state(sk, BT_CONNECTED,
264 sock_sndtimeo(sk, flags & O_NONBLOCK));
265
266 release_sock(sk);
267
268 return err;
269}
270
271static int l2cap_sock_listen(struct socket *sock, int backlog)
272{
273 struct sock *sk = sock->sk;
274 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
275 int err = 0;
276
277 BT_DBG("sk %p backlog %d", sk, backlog);
278
279 lock_sock(sk);
280
281 if (sk->sk_state != BT_BOUND) {
282 err = -EBADFD;
283 goto done;
284 }
285
286 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
287 err = -EINVAL;
288 goto done;
289 }
290
291 switch (chan->mode) {
292 case L2CAP_MODE_BASIC:
293 case L2CAP_MODE_LE_FLOWCTL:
294 break;
295 case L2CAP_MODE_EXT_FLOWCTL:
296 if (!enable_ecred) {
297 err = -EOPNOTSUPP;
298 goto done;
299 }
300 break;
301 case L2CAP_MODE_ERTM:
302 case L2CAP_MODE_STREAMING:
303 if (!disable_ertm)
304 break;
305 fallthrough;
306 default:
307 err = -EOPNOTSUPP;
308 goto done;
309 }
310
311 sk->sk_max_ack_backlog = backlog;
312 sk->sk_ack_backlog = 0;
313
314 /* Listening channels need to use nested locking in order not to
315 * cause lockdep warnings when the created child channels end up
316 * being locked in the same thread as the parent channel.
317 */
318 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
319
320 chan->state = BT_LISTEN;
321 sk->sk_state = BT_LISTEN;
322
323done:
324 release_sock(sk);
325 return err;
326}
327
328static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
329 int flags, bool kern)
330{
331 DEFINE_WAIT_FUNC(wait, woken_wake_function);
332 struct sock *sk = sock->sk, *nsk;
333 long timeo;
334 int err = 0;
335
336 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
337
338 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
339
340 BT_DBG("sk %p timeo %ld", sk, timeo);
341
342 /* Wait for an incoming connection. (wake-one). */
343 add_wait_queue_exclusive(sk_sleep(sk), &wait);
344 while (1) {
345 if (sk->sk_state != BT_LISTEN) {
346 err = -EBADFD;
347 break;
348 }
349
350 nsk = bt_accept_dequeue(sk, newsock);
351 if (nsk)
352 break;
353
354 if (!timeo) {
355 err = -EAGAIN;
356 break;
357 }
358
359 if (signal_pending(current)) {
360 err = sock_intr_errno(timeo);
361 break;
362 }
363
364 release_sock(sk);
365
366 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
367
368 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
369 }
370 remove_wait_queue(sk_sleep(sk), &wait);
371
372 if (err)
373 goto done;
374
375 newsock->state = SS_CONNECTED;
376
377 BT_DBG("new socket %p", nsk);
378
379done:
380 release_sock(sk);
381 return err;
382}
383
384static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
385 int peer)
386{
387 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
388 struct sock *sk = sock->sk;
389 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
390
391 BT_DBG("sock %p, sk %p", sock, sk);
392
393 if (peer && sk->sk_state != BT_CONNECTED &&
394 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 &&
395 sk->sk_state != BT_CONFIG)
396 return -ENOTCONN;
397
398 memset(la, 0, sizeof(struct sockaddr_l2));
399 addr->sa_family = AF_BLUETOOTH;
400
401 la->l2_psm = chan->psm;
402
403 if (peer) {
404 bacpy(&la->l2_bdaddr, &chan->dst);
405 la->l2_cid = cpu_to_le16(chan->dcid);
406 la->l2_bdaddr_type = chan->dst_type;
407 } else {
408 bacpy(&la->l2_bdaddr, &chan->src);
409 la->l2_cid = cpu_to_le16(chan->scid);
410 la->l2_bdaddr_type = chan->src_type;
411 }
412
413 return sizeof(struct sockaddr_l2);
414}
415
416static int l2cap_get_mode(struct l2cap_chan *chan)
417{
418 switch (chan->mode) {
419 case L2CAP_MODE_BASIC:
420 return BT_MODE_BASIC;
421 case L2CAP_MODE_ERTM:
422 return BT_MODE_ERTM;
423 case L2CAP_MODE_STREAMING:
424 return BT_MODE_STREAMING;
425 case L2CAP_MODE_LE_FLOWCTL:
426 return BT_MODE_LE_FLOWCTL;
427 case L2CAP_MODE_EXT_FLOWCTL:
428 return BT_MODE_EXT_FLOWCTL;
429 }
430
431 return -EINVAL;
432}
433
434static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
435 char __user *optval, int __user *optlen)
436{
437 struct sock *sk = sock->sk;
438 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
439 struct l2cap_options opts;
440 struct l2cap_conninfo cinfo;
441 int len, err = 0;
442 u32 opt;
443
444 BT_DBG("sk %p", sk);
445
446 if (get_user(len, optlen))
447 return -EFAULT;
448
449 lock_sock(sk);
450
451 switch (optname) {
452 case L2CAP_OPTIONS:
453 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
454 * legacy ATT code depends on getsockopt for
455 * L2CAP_OPTIONS we need to let this pass.
456 */
457 if (bdaddr_type_is_le(chan->src_type) &&
458 chan->scid != L2CAP_CID_ATT) {
459 err = -EINVAL;
460 break;
461 }
462
463 /* Only BR/EDR modes are supported here */
464 switch (chan->mode) {
465 case L2CAP_MODE_BASIC:
466 case L2CAP_MODE_ERTM:
467 case L2CAP_MODE_STREAMING:
468 break;
469 default:
470 err = -EINVAL;
471 break;
472 }
473
474 if (err < 0)
475 break;
476
477 memset(&opts, 0, sizeof(opts));
478 opts.imtu = chan->imtu;
479 opts.omtu = chan->omtu;
480 opts.flush_to = chan->flush_to;
481 opts.mode = chan->mode;
482 opts.fcs = chan->fcs;
483 opts.max_tx = chan->max_tx;
484 opts.txwin_size = chan->tx_win;
485
486 BT_DBG("mode 0x%2.2x", chan->mode);
487
488 len = min_t(unsigned int, len, sizeof(opts));
489 if (copy_to_user(optval, (char *) &opts, len))
490 err = -EFAULT;
491
492 break;
493
494 case L2CAP_LM:
495 switch (chan->sec_level) {
496 case BT_SECURITY_LOW:
497 opt = L2CAP_LM_AUTH;
498 break;
499 case BT_SECURITY_MEDIUM:
500 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
501 break;
502 case BT_SECURITY_HIGH:
503 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
504 L2CAP_LM_SECURE;
505 break;
506 case BT_SECURITY_FIPS:
507 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
508 L2CAP_LM_SECURE | L2CAP_LM_FIPS;
509 break;
510 default:
511 opt = 0;
512 break;
513 }
514
515 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
516 opt |= L2CAP_LM_MASTER;
517
518 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
519 opt |= L2CAP_LM_RELIABLE;
520
521 if (put_user(opt, (u32 __user *) optval))
522 err = -EFAULT;
523
524 break;
525
526 case L2CAP_CONNINFO:
527 if (sk->sk_state != BT_CONNECTED &&
528 !(sk->sk_state == BT_CONNECT2 &&
529 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
530 err = -ENOTCONN;
531 break;
532 }
533
534 memset(&cinfo, 0, sizeof(cinfo));
535 cinfo.hci_handle = chan->conn->hcon->handle;
536 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
537
538 len = min_t(unsigned int, len, sizeof(cinfo));
539 if (copy_to_user(optval, (char *) &cinfo, len))
540 err = -EFAULT;
541
542 break;
543
544 default:
545 err = -ENOPROTOOPT;
546 break;
547 }
548
549 release_sock(sk);
550 return err;
551}
552
553static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
554 char __user *optval, int __user *optlen)
555{
556 struct sock *sk = sock->sk;
557 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
558 struct bt_security sec;
559 struct bt_power pwr;
560 u32 phys;
561 int len, mode, err = 0;
562
563 BT_DBG("sk %p", sk);
564
565 if (level == SOL_L2CAP)
566 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
567
568 if (level != SOL_BLUETOOTH)
569 return -ENOPROTOOPT;
570
571 if (get_user(len, optlen))
572 return -EFAULT;
573
574 lock_sock(sk);
575
576 switch (optname) {
577 case BT_SECURITY:
578 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
579 chan->chan_type != L2CAP_CHAN_FIXED &&
580 chan->chan_type != L2CAP_CHAN_RAW) {
581 err = -EINVAL;
582 break;
583 }
584
585 memset(&sec, 0, sizeof(sec));
586 if (chan->conn) {
587 sec.level = chan->conn->hcon->sec_level;
588
589 if (sk->sk_state == BT_CONNECTED)
590 sec.key_size = chan->conn->hcon->enc_key_size;
591 } else {
592 sec.level = chan->sec_level;
593 }
594
595 len = min_t(unsigned int, len, sizeof(sec));
596 if (copy_to_user(optval, (char *) &sec, len))
597 err = -EFAULT;
598
599 break;
600
601 case BT_DEFER_SETUP:
602 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
603 err = -EINVAL;
604 break;
605 }
606
607 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
608 (u32 __user *) optval))
609 err = -EFAULT;
610
611 break;
612
613 case BT_FLUSHABLE:
614 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
615 (u32 __user *) optval))
616 err = -EFAULT;
617
618 break;
619
620 case BT_POWER:
621 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
622 && sk->sk_type != SOCK_RAW) {
623 err = -EINVAL;
624 break;
625 }
626
627 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
628
629 len = min_t(unsigned int, len, sizeof(pwr));
630 if (copy_to_user(optval, (char *) &pwr, len))
631 err = -EFAULT;
632
633 break;
634
635 case BT_CHANNEL_POLICY:
636 if (put_user(chan->chan_policy, (u32 __user *) optval))
637 err = -EFAULT;
638 break;
639
640 case BT_SNDMTU:
641 if (!bdaddr_type_is_le(chan->src_type)) {
642 err = -EINVAL;
643 break;
644 }
645
646 if (sk->sk_state != BT_CONNECTED) {
647 err = -ENOTCONN;
648 break;
649 }
650
651 if (put_user(chan->omtu, (u16 __user *) optval))
652 err = -EFAULT;
653 break;
654
655 case BT_RCVMTU:
656 if (!bdaddr_type_is_le(chan->src_type)) {
657 err = -EINVAL;
658 break;
659 }
660
661 if (put_user(chan->imtu, (u16 __user *) optval))
662 err = -EFAULT;
663 break;
664
665 case BT_PHY:
666 if (sk->sk_state != BT_CONNECTED) {
667 err = -ENOTCONN;
668 break;
669 }
670
671 phys = hci_conn_get_phy(chan->conn->hcon);
672
673 if (put_user(phys, (u32 __user *) optval))
674 err = -EFAULT;
675 break;
676
677 case BT_MODE:
678 if (!enable_ecred) {
679 err = -ENOPROTOOPT;
680 break;
681 }
682
683 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
684 err = -EINVAL;
685 break;
686 }
687
688 mode = l2cap_get_mode(chan);
689 if (mode < 0) {
690 err = mode;
691 break;
692 }
693
694 if (put_user(mode, (u8 __user *) optval))
695 err = -EFAULT;
696 break;
697
698 default:
699 err = -ENOPROTOOPT;
700 break;
701 }
702
703 release_sock(sk);
704 return err;
705}
706
707static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
708{
709 switch (chan->scid) {
710 case L2CAP_CID_ATT:
711 if (mtu < L2CAP_LE_MIN_MTU)
712 return false;
713 break;
714
715 default:
716 if (mtu < L2CAP_DEFAULT_MIN_MTU)
717 return false;
718 }
719
720 return true;
721}
722
723static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
724 sockptr_t optval, unsigned int optlen)
725{
726 struct sock *sk = sock->sk;
727 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
728 struct l2cap_options opts;
729 int len, err = 0;
730 u32 opt;
731
732 BT_DBG("sk %p", sk);
733
734 lock_sock(sk);
735
736 switch (optname) {
737 case L2CAP_OPTIONS:
738 if (bdaddr_type_is_le(chan->src_type)) {
739 err = -EINVAL;
740 break;
741 }
742
743 if (sk->sk_state == BT_CONNECTED) {
744 err = -EINVAL;
745 break;
746 }
747
748 opts.imtu = chan->imtu;
749 opts.omtu = chan->omtu;
750 opts.flush_to = chan->flush_to;
751 opts.mode = chan->mode;
752 opts.fcs = chan->fcs;
753 opts.max_tx = chan->max_tx;
754 opts.txwin_size = chan->tx_win;
755
756 len = min_t(unsigned int, sizeof(opts), optlen);
757 if (copy_from_sockptr(&opts, optval, len)) {
758 err = -EFAULT;
759 break;
760 }
761
762 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
763 err = -EINVAL;
764 break;
765 }
766
767 if (!l2cap_valid_mtu(chan, opts.imtu)) {
768 err = -EINVAL;
769 break;
770 }
771
772 /* Only BR/EDR modes are supported here */
773 switch (opts.mode) {
774 case L2CAP_MODE_BASIC:
775 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
776 break;
777 case L2CAP_MODE_ERTM:
778 case L2CAP_MODE_STREAMING:
779 if (!disable_ertm)
780 break;
781 fallthrough;
782 default:
783 err = -EINVAL;
784 break;
785 }
786
787 if (err < 0)
788 break;
789
790 chan->mode = opts.mode;
791
792 BT_DBG("mode 0x%2.2x", chan->mode);
793
794 chan->imtu = opts.imtu;
795 chan->omtu = opts.omtu;
796 chan->fcs = opts.fcs;
797 chan->max_tx = opts.max_tx;
798 chan->tx_win = opts.txwin_size;
799 chan->flush_to = opts.flush_to;
800 break;
801
802 case L2CAP_LM:
803 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
804 err = -EFAULT;
805 break;
806 }
807
808 if (opt & L2CAP_LM_FIPS) {
809 err = -EINVAL;
810 break;
811 }
812
813 if (opt & L2CAP_LM_AUTH)
814 chan->sec_level = BT_SECURITY_LOW;
815 if (opt & L2CAP_LM_ENCRYPT)
816 chan->sec_level = BT_SECURITY_MEDIUM;
817 if (opt & L2CAP_LM_SECURE)
818 chan->sec_level = BT_SECURITY_HIGH;
819
820 if (opt & L2CAP_LM_MASTER)
821 set_bit(FLAG_ROLE_SWITCH, &chan->flags);
822 else
823 clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
824
825 if (opt & L2CAP_LM_RELIABLE)
826 set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
827 else
828 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
829 break;
830
831 default:
832 err = -ENOPROTOOPT;
833 break;
834 }
835
836 release_sock(sk);
837 return err;
838}
839
840static int l2cap_set_mode(struct l2cap_chan *chan, u8 mode)
841{
842 switch (mode) {
843 case BT_MODE_BASIC:
844 if (bdaddr_type_is_le(chan->src_type))
845 return -EINVAL;
846 mode = L2CAP_MODE_BASIC;
847 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
848 break;
849 case BT_MODE_ERTM:
850 if (!disable_ertm || bdaddr_type_is_le(chan->src_type))
851 return -EINVAL;
852 mode = L2CAP_MODE_ERTM;
853 break;
854 case BT_MODE_STREAMING:
855 if (!disable_ertm || bdaddr_type_is_le(chan->src_type))
856 return -EINVAL;
857 mode = L2CAP_MODE_STREAMING;
858 break;
859 case BT_MODE_LE_FLOWCTL:
860 if (!bdaddr_type_is_le(chan->src_type))
861 return -EINVAL;
862 mode = L2CAP_MODE_LE_FLOWCTL;
863 break;
864 case BT_MODE_EXT_FLOWCTL:
865 /* TODO: Add support for ECRED PDUs to BR/EDR */
866 if (!bdaddr_type_is_le(chan->src_type))
867 return -EINVAL;
868 mode = L2CAP_MODE_EXT_FLOWCTL;
869 break;
870 default:
871 return -EINVAL;
872 }
873
874 chan->mode = mode;
875
876 return 0;
877}
878
879static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
880 sockptr_t optval, unsigned int optlen)
881{
882 struct sock *sk = sock->sk;
883 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
884 struct bt_security sec;
885 struct bt_power pwr;
886 struct l2cap_conn *conn;
887 int len, err = 0;
888 u32 opt;
889 u16 mtu;
890 u8 mode;
891
892 BT_DBG("sk %p", sk);
893
894 if (level == SOL_L2CAP)
895 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
896
897 if (level != SOL_BLUETOOTH)
898 return -ENOPROTOOPT;
899
900 lock_sock(sk);
901
902 switch (optname) {
903 case BT_SECURITY:
904 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
905 chan->chan_type != L2CAP_CHAN_FIXED &&
906 chan->chan_type != L2CAP_CHAN_RAW) {
907 err = -EINVAL;
908 break;
909 }
910
911 sec.level = BT_SECURITY_LOW;
912
913 len = min_t(unsigned int, sizeof(sec), optlen);
914 if (copy_from_sockptr(&sec, optval, len)) {
915 err = -EFAULT;
916 break;
917 }
918
919 if (sec.level < BT_SECURITY_LOW ||
920 sec.level > BT_SECURITY_FIPS) {
921 err = -EINVAL;
922 break;
923 }
924
925 chan->sec_level = sec.level;
926
927 if (!chan->conn)
928 break;
929
930 conn = chan->conn;
931
932 /* change security for LE channels */
933 if (chan->scid == L2CAP_CID_ATT) {
934 if (smp_conn_security(conn->hcon, sec.level)) {
935 err = -EINVAL;
936 break;
937 }
938
939 set_bit(FLAG_PENDING_SECURITY, &chan->flags);
940 sk->sk_state = BT_CONFIG;
941 chan->state = BT_CONFIG;
942
943 /* or for ACL link */
944 } else if ((sk->sk_state == BT_CONNECT2 &&
945 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
946 sk->sk_state == BT_CONNECTED) {
947 if (!l2cap_chan_check_security(chan, true))
948 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
949 else
950 sk->sk_state_change(sk);
951 } else {
952 err = -EINVAL;
953 }
954 break;
955
956 case BT_DEFER_SETUP:
957 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
958 err = -EINVAL;
959 break;
960 }
961
962 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
963 err = -EFAULT;
964 break;
965 }
966
967 if (opt) {
968 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
969 set_bit(FLAG_DEFER_SETUP, &chan->flags);
970 } else {
971 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
972 clear_bit(FLAG_DEFER_SETUP, &chan->flags);
973 }
974 break;
975
976 case BT_FLUSHABLE:
977 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
978 err = -EFAULT;
979 break;
980 }
981
982 if (opt > BT_FLUSHABLE_ON) {
983 err = -EINVAL;
984 break;
985 }
986
987 if (opt == BT_FLUSHABLE_OFF) {
988 conn = chan->conn;
989 /* proceed further only when we have l2cap_conn and
990 No Flush support in the LM */
991 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
992 err = -EINVAL;
993 break;
994 }
995 }
996
997 if (opt)
998 set_bit(FLAG_FLUSHABLE, &chan->flags);
999 else
1000 clear_bit(FLAG_FLUSHABLE, &chan->flags);
1001 break;
1002
1003 case BT_POWER:
1004 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
1005 chan->chan_type != L2CAP_CHAN_RAW) {
1006 err = -EINVAL;
1007 break;
1008 }
1009
1010 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
1011
1012 len = min_t(unsigned int, sizeof(pwr), optlen);
1013 if (copy_from_sockptr(&pwr, optval, len)) {
1014 err = -EFAULT;
1015 break;
1016 }
1017
1018 if (pwr.force_active)
1019 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1020 else
1021 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1022 break;
1023
1024 case BT_CHANNEL_POLICY:
1025 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
1026 err = -EFAULT;
1027 break;
1028 }
1029
1030 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
1031 err = -EINVAL;
1032 break;
1033 }
1034
1035 if (chan->mode != L2CAP_MODE_ERTM &&
1036 chan->mode != L2CAP_MODE_STREAMING) {
1037 err = -EOPNOTSUPP;
1038 break;
1039 }
1040
1041 chan->chan_policy = (u8) opt;
1042
1043 if (sk->sk_state == BT_CONNECTED &&
1044 chan->move_role == L2CAP_MOVE_ROLE_NONE)
1045 l2cap_move_start(chan);
1046
1047 break;
1048
1049 case BT_SNDMTU:
1050 if (!bdaddr_type_is_le(chan->src_type)) {
1051 err = -EINVAL;
1052 break;
1053 }
1054
1055 /* Setting is not supported as it's the remote side that
1056 * decides this.
1057 */
1058 err = -EPERM;
1059 break;
1060
1061 case BT_RCVMTU:
1062 if (!bdaddr_type_is_le(chan->src_type)) {
1063 err = -EINVAL;
1064 break;
1065 }
1066
1067 if (chan->mode == L2CAP_MODE_LE_FLOWCTL &&
1068 sk->sk_state == BT_CONNECTED) {
1069 err = -EISCONN;
1070 break;
1071 }
1072
1073 if (copy_from_sockptr(&mtu, optval, sizeof(u16))) {
1074 err = -EFAULT;
1075 break;
1076 }
1077
1078 if (chan->mode == L2CAP_MODE_EXT_FLOWCTL &&
1079 sk->sk_state == BT_CONNECTED)
1080 err = l2cap_chan_reconfigure(chan, mtu);
1081 else
1082 chan->imtu = mtu;
1083
1084 break;
1085
1086 case BT_MODE:
1087 if (!enable_ecred) {
1088 err = -ENOPROTOOPT;
1089 break;
1090 }
1091
1092 BT_DBG("sk->sk_state %u", sk->sk_state);
1093
1094 if (sk->sk_state != BT_BOUND) {
1095 err = -EINVAL;
1096 break;
1097 }
1098
1099 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1100 err = -EINVAL;
1101 break;
1102 }
1103
1104 if (copy_from_sockptr(&mode, optval, sizeof(u8))) {
1105 err = -EFAULT;
1106 break;
1107 }
1108
1109 BT_DBG("mode %u", mode);
1110
1111 err = l2cap_set_mode(chan, mode);
1112 if (err)
1113 break;
1114
1115 BT_DBG("mode 0x%2.2x", chan->mode);
1116
1117 break;
1118
1119 default:
1120 err = -ENOPROTOOPT;
1121 break;
1122 }
1123
1124 release_sock(sk);
1125 return err;
1126}
1127
1128static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1129 size_t len)
1130{
1131 struct sock *sk = sock->sk;
1132 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1133 int err;
1134
1135 BT_DBG("sock %p, sk %p", sock, sk);
1136
1137 err = sock_error(sk);
1138 if (err)
1139 return err;
1140
1141 if (msg->msg_flags & MSG_OOB)
1142 return -EOPNOTSUPP;
1143
1144 if (sk->sk_state != BT_CONNECTED)
1145 return -ENOTCONN;
1146
1147 lock_sock(sk);
1148 err = bt_sock_wait_ready(sk, msg->msg_flags);
1149 release_sock(sk);
1150 if (err)
1151 return err;
1152
1153 l2cap_chan_lock(chan);
1154 err = l2cap_chan_send(chan, msg, len);
1155 l2cap_chan_unlock(chan);
1156
1157 return err;
1158}
1159
1160static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1161 size_t len, int flags)
1162{
1163 struct sock *sk = sock->sk;
1164 struct l2cap_pinfo *pi = l2cap_pi(sk);
1165 int err;
1166
1167 lock_sock(sk);
1168
1169 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
1170 &bt_sk(sk)->flags)) {
1171 if (pi->chan->mode == L2CAP_MODE_EXT_FLOWCTL) {
1172 sk->sk_state = BT_CONNECTED;
1173 pi->chan->state = BT_CONNECTED;
1174 __l2cap_ecred_conn_rsp_defer(pi->chan);
1175 } else if (bdaddr_type_is_le(pi->chan->src_type)) {
1176 sk->sk_state = BT_CONNECTED;
1177 pi->chan->state = BT_CONNECTED;
1178 __l2cap_le_connect_rsp_defer(pi->chan);
1179 } else {
1180 sk->sk_state = BT_CONFIG;
1181 pi->chan->state = BT_CONFIG;
1182 __l2cap_connect_rsp_defer(pi->chan);
1183 }
1184
1185 err = 0;
1186 goto done;
1187 }
1188
1189 release_sock(sk);
1190
1191 if (sock->type == SOCK_STREAM)
1192 err = bt_sock_stream_recvmsg(sock, msg, len, flags);
1193 else
1194 err = bt_sock_recvmsg(sock, msg, len, flags);
1195
1196 if (pi->chan->mode != L2CAP_MODE_ERTM)
1197 return err;
1198
1199 /* Attempt to put pending rx data in the socket buffer */
1200
1201 lock_sock(sk);
1202
1203 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
1204 goto done;
1205
1206 if (pi->rx_busy_skb) {
1207 if (!__sock_queue_rcv_skb(sk, pi->rx_busy_skb))
1208 pi->rx_busy_skb = NULL;
1209 else
1210 goto done;
1211 }
1212
1213 /* Restore data flow when half of the receive buffer is
1214 * available. This avoids resending large numbers of
1215 * frames.
1216 */
1217 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1218 l2cap_chan_busy(pi->chan, 0);
1219
1220done:
1221 release_sock(sk);
1222 return err;
1223}
1224
1225/* Kill socket (only if zapped and orphan)
1226 * Must be called on unlocked socket, with l2cap channel lock.
1227 */
1228static void l2cap_sock_kill(struct sock *sk)
1229{
1230 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1231 return;
1232
1233 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
1234
1235 /* Kill poor orphan */
1236
1237 l2cap_chan_put(l2cap_pi(sk)->chan);
1238 sock_set_flag(sk, SOCK_DEAD);
1239 sock_put(sk);
1240}
1241
1242static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
1243{
1244 DECLARE_WAITQUEUE(wait, current);
1245 int err = 0;
1246 int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1247 /* Timeout to prevent infinite loop */
1248 unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
1249
1250 add_wait_queue(sk_sleep(sk), &wait);
1251 set_current_state(TASK_INTERRUPTIBLE);
1252 do {
1253 BT_DBG("Waiting for %d ACKs, timeout %04d ms",
1254 chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
1255 jiffies_to_msecs(timeout - jiffies));
1256
1257 if (!timeo)
1258 timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1259
1260 if (signal_pending(current)) {
1261 err = sock_intr_errno(timeo);
1262 break;
1263 }
1264
1265 release_sock(sk);
1266 timeo = schedule_timeout(timeo);
1267 lock_sock(sk);
1268 set_current_state(TASK_INTERRUPTIBLE);
1269
1270 err = sock_error(sk);
1271 if (err)
1272 break;
1273
1274 if (time_after(jiffies, timeout)) {
1275 err = -ENOLINK;
1276 break;
1277 }
1278
1279 } while (chan->unacked_frames > 0 &&
1280 chan->state == BT_CONNECTED);
1281
1282 set_current_state(TASK_RUNNING);
1283 remove_wait_queue(sk_sleep(sk), &wait);
1284 return err;
1285}
1286
1287static int l2cap_sock_shutdown(struct socket *sock, int how)
1288{
1289 struct sock *sk = sock->sk;
1290 struct l2cap_chan *chan;
1291 struct l2cap_conn *conn;
1292 int err = 0;
1293
1294 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1295
1296 /* 'how' parameter is mapped to sk_shutdown as follows:
1297 * SHUT_RD (0) --> RCV_SHUTDOWN (1)
1298 * SHUT_WR (1) --> SEND_SHUTDOWN (2)
1299 * SHUT_RDWR (2) --> SHUTDOWN_MASK (3)
1300 */
1301 how++;
1302
1303 if (!sk)
1304 return 0;
1305
1306 lock_sock(sk);
1307
1308 if ((sk->sk_shutdown & how) == how)
1309 goto shutdown_already;
1310
1311 BT_DBG("Handling sock shutdown");
1312
1313 /* prevent sk structure from being freed whilst unlocked */
1314 sock_hold(sk);
1315
1316 chan = l2cap_pi(sk)->chan;
1317 /* prevent chan structure from being freed whilst unlocked */
1318 l2cap_chan_hold(chan);
1319
1320 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1321
1322 if (chan->mode == L2CAP_MODE_ERTM &&
1323 chan->unacked_frames > 0 &&
1324 chan->state == BT_CONNECTED) {
1325 err = __l2cap_wait_ack(sk, chan);
1326
1327 /* After waiting for ACKs, check whether shutdown
1328 * has already been actioned to close the L2CAP
1329 * link such as by l2cap_disconnection_req().
1330 */
1331 if ((sk->sk_shutdown & how) == how)
1332 goto shutdown_matched;
1333 }
1334
1335 /* Try setting the RCV_SHUTDOWN bit, return early if SEND_SHUTDOWN
1336 * is already set
1337 */
1338 if ((how & RCV_SHUTDOWN) && !(sk->sk_shutdown & RCV_SHUTDOWN)) {
1339 sk->sk_shutdown |= RCV_SHUTDOWN;
1340 if ((sk->sk_shutdown & how) == how)
1341 goto shutdown_matched;
1342 }
1343
1344 sk->sk_shutdown |= SEND_SHUTDOWN;
1345 release_sock(sk);
1346
1347 l2cap_chan_lock(chan);
1348 conn = chan->conn;
1349 if (conn)
1350 /* prevent conn structure from being freed */
1351 l2cap_conn_get(conn);
1352 l2cap_chan_unlock(chan);
1353
1354 if (conn)
1355 /* mutex lock must be taken before l2cap_chan_lock() */
1356 mutex_lock(&conn->chan_lock);
1357
1358 l2cap_chan_lock(chan);
1359 l2cap_chan_close(chan, 0);
1360 l2cap_chan_unlock(chan);
1361
1362 if (conn) {
1363 mutex_unlock(&conn->chan_lock);
1364 l2cap_conn_put(conn);
1365 }
1366
1367 lock_sock(sk);
1368
1369 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1370 !(current->flags & PF_EXITING))
1371 err = bt_sock_wait_state(sk, BT_CLOSED,
1372 sk->sk_lingertime);
1373
1374shutdown_matched:
1375 l2cap_chan_put(chan);
1376 sock_put(sk);
1377
1378shutdown_already:
1379 if (!err && sk->sk_err)
1380 err = -sk->sk_err;
1381
1382 release_sock(sk);
1383
1384 BT_DBG("Sock shutdown complete err: %d", err);
1385
1386 return err;
1387}
1388
1389static int l2cap_sock_release(struct socket *sock)
1390{
1391 struct sock *sk = sock->sk;
1392 int err;
1393 struct l2cap_chan *chan;
1394
1395 BT_DBG("sock %p, sk %p", sock, sk);
1396
1397 if (!sk)
1398 return 0;
1399
1400 l2cap_sock_cleanup_listen(sk);
1401 bt_sock_unlink(&l2cap_sk_list, sk);
1402
1403 err = l2cap_sock_shutdown(sock, SHUT_RDWR);
1404 chan = l2cap_pi(sk)->chan;
1405
1406 l2cap_chan_hold(chan);
1407 l2cap_chan_lock(chan);
1408
1409 sock_orphan(sk);
1410 l2cap_sock_kill(sk);
1411
1412 l2cap_chan_unlock(chan);
1413 l2cap_chan_put(chan);
1414
1415 return err;
1416}
1417
1418static void l2cap_sock_cleanup_listen(struct sock *parent)
1419{
1420 struct sock *sk;
1421
1422 BT_DBG("parent %p state %s", parent,
1423 state_to_string(parent->sk_state));
1424
1425 /* Close not yet accepted channels */
1426 while ((sk = bt_accept_dequeue(parent, NULL))) {
1427 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1428
1429 BT_DBG("child chan %p state %s", chan,
1430 state_to_string(chan->state));
1431
1432 l2cap_chan_hold(chan);
1433 l2cap_chan_lock(chan);
1434
1435 __clear_chan_timer(chan);
1436 l2cap_chan_close(chan, ECONNRESET);
1437 l2cap_sock_kill(sk);
1438
1439 l2cap_chan_unlock(chan);
1440 l2cap_chan_put(chan);
1441 }
1442}
1443
1444static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1445{
1446 struct sock *sk, *parent = chan->data;
1447
1448 lock_sock(parent);
1449
1450 /* Check for backlog size */
1451 if (sk_acceptq_is_full(parent)) {
1452 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1453 release_sock(parent);
1454 return NULL;
1455 }
1456
1457 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1458 GFP_ATOMIC, 0);
1459 if (!sk) {
1460 release_sock(parent);
1461 return NULL;
1462 }
1463
1464 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1465
1466 l2cap_sock_init(sk, parent);
1467
1468 bt_accept_enqueue(parent, sk, false);
1469
1470 release_sock(parent);
1471
1472 return l2cap_pi(sk)->chan;
1473}
1474
1475static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1476{
1477 struct sock *sk = chan->data;
1478 int err;
1479
1480 lock_sock(sk);
1481
1482 if (l2cap_pi(sk)->rx_busy_skb) {
1483 err = -ENOMEM;
1484 goto done;
1485 }
1486
1487 if (chan->mode != L2CAP_MODE_ERTM &&
1488 chan->mode != L2CAP_MODE_STREAMING) {
1489 /* Even if no filter is attached, we could potentially
1490 * get errors from security modules, etc.
1491 */
1492 err = sk_filter(sk, skb);
1493 if (err)
1494 goto done;
1495 }
1496
1497 err = __sock_queue_rcv_skb(sk, skb);
1498
1499 /* For ERTM, handle one skb that doesn't fit into the recv
1500 * buffer. This is important to do because the data frames
1501 * have already been acked, so the skb cannot be discarded.
1502 *
1503 * Notify the l2cap core that the buffer is full, so the
1504 * LOCAL_BUSY state is entered and no more frames are
1505 * acked and reassembled until there is buffer space
1506 * available.
1507 */
1508 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1509 l2cap_pi(sk)->rx_busy_skb = skb;
1510 l2cap_chan_busy(chan, 1);
1511 err = 0;
1512 }
1513
1514done:
1515 release_sock(sk);
1516
1517 return err;
1518}
1519
1520static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1521{
1522 struct sock *sk = chan->data;
1523
1524 if (!sk)
1525 return;
1526
1527 l2cap_sock_kill(sk);
1528}
1529
1530static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1531{
1532 struct sock *sk = chan->data;
1533 struct sock *parent;
1534
1535 if (!sk)
1536 return;
1537
1538 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1539
1540 /* This callback can be called both for server (BT_LISTEN)
1541 * sockets as well as "normal" ones. To avoid lockdep warnings
1542 * with child socket locking (through l2cap_sock_cleanup_listen)
1543 * we need separation into separate nesting levels. The simplest
1544 * way to accomplish this is to inherit the nesting level used
1545 * for the channel.
1546 */
1547 lock_sock_nested(sk, atomic_read(&chan->nesting));
1548
1549 parent = bt_sk(sk)->parent;
1550
1551 switch (chan->state) {
1552 case BT_OPEN:
1553 case BT_BOUND:
1554 case BT_CLOSED:
1555 break;
1556 case BT_LISTEN:
1557 l2cap_sock_cleanup_listen(sk);
1558 sk->sk_state = BT_CLOSED;
1559 chan->state = BT_CLOSED;
1560
1561 break;
1562 default:
1563 sk->sk_state = BT_CLOSED;
1564 chan->state = BT_CLOSED;
1565
1566 sk->sk_err = err;
1567
1568 if (parent) {
1569 bt_accept_unlink(sk);
1570 parent->sk_data_ready(parent);
1571 } else {
1572 sk->sk_state_change(sk);
1573 }
1574
1575 break;
1576 }
1577 release_sock(sk);
1578
1579 /* Only zap after cleanup to avoid use after free race */
1580 sock_set_flag(sk, SOCK_ZAPPED);
1581
1582}
1583
1584static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1585 int err)
1586{
1587 struct sock *sk = chan->data;
1588
1589 sk->sk_state = state;
1590
1591 if (err)
1592 sk->sk_err = err;
1593}
1594
1595static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1596 unsigned long hdr_len,
1597 unsigned long len, int nb)
1598{
1599 struct sock *sk = chan->data;
1600 struct sk_buff *skb;
1601 int err;
1602
1603 l2cap_chan_unlock(chan);
1604 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1605 l2cap_chan_lock(chan);
1606
1607 if (!skb)
1608 return ERR_PTR(err);
1609
1610 /* Channel lock is released before requesting new skb and then
1611 * reacquired thus we need to recheck channel state.
1612 */
1613 if (chan->state != BT_CONNECTED) {
1614 kfree_skb(skb);
1615 return ERR_PTR(-ENOTCONN);
1616 }
1617
1618 skb->priority = READ_ONCE(sk->sk_priority);
1619
1620 bt_cb(skb)->l2cap.chan = chan;
1621
1622 return skb;
1623}
1624
1625static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1626{
1627 struct sock *sk = chan->data;
1628 struct sock *parent;
1629
1630 lock_sock(sk);
1631
1632 parent = bt_sk(sk)->parent;
1633
1634 BT_DBG("sk %p, parent %p", sk, parent);
1635
1636 sk->sk_state = BT_CONNECTED;
1637 sk->sk_state_change(sk);
1638
1639 if (parent)
1640 parent->sk_data_ready(parent);
1641
1642 release_sock(sk);
1643}
1644
1645static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1646{
1647 struct sock *parent, *sk = chan->data;
1648
1649 lock_sock(sk);
1650
1651 parent = bt_sk(sk)->parent;
1652 if (parent)
1653 parent->sk_data_ready(parent);
1654
1655 release_sock(sk);
1656}
1657
1658static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1659{
1660 struct sock *sk = chan->data;
1661
1662 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1663 sk->sk_state = BT_CONNECTED;
1664 chan->state = BT_CONNECTED;
1665 }
1666
1667 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1668 sk->sk_state_change(sk);
1669}
1670
1671static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1672{
1673 struct sock *sk = chan->data;
1674
1675 lock_sock(sk);
1676 sk->sk_shutdown = SHUTDOWN_MASK;
1677 release_sock(sk);
1678}
1679
1680static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1681{
1682 struct sock *sk = chan->data;
1683
1684 return sk->sk_sndtimeo;
1685}
1686
1687static struct pid *l2cap_sock_get_peer_pid_cb(struct l2cap_chan *chan)
1688{
1689 struct sock *sk = chan->data;
1690
1691 return sk->sk_peer_pid;
1692}
1693
1694static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1695{
1696 struct sock *sk = chan->data;
1697
1698 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1699 sk->sk_state_change(sk);
1700}
1701
1702static int l2cap_sock_filter(struct l2cap_chan *chan, struct sk_buff *skb)
1703{
1704 struct sock *sk = chan->data;
1705
1706 switch (chan->mode) {
1707 case L2CAP_MODE_ERTM:
1708 case L2CAP_MODE_STREAMING:
1709 return sk_filter(sk, skb);
1710 }
1711
1712 return 0;
1713}
1714
1715static const struct l2cap_ops l2cap_chan_ops = {
1716 .name = "L2CAP Socket Interface",
1717 .new_connection = l2cap_sock_new_connection_cb,
1718 .recv = l2cap_sock_recv_cb,
1719 .close = l2cap_sock_close_cb,
1720 .teardown = l2cap_sock_teardown_cb,
1721 .state_change = l2cap_sock_state_change_cb,
1722 .ready = l2cap_sock_ready_cb,
1723 .defer = l2cap_sock_defer_cb,
1724 .resume = l2cap_sock_resume_cb,
1725 .suspend = l2cap_sock_suspend_cb,
1726 .set_shutdown = l2cap_sock_set_shutdown_cb,
1727 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1728 .get_peer_pid = l2cap_sock_get_peer_pid_cb,
1729 .alloc_skb = l2cap_sock_alloc_skb_cb,
1730 .filter = l2cap_sock_filter,
1731};
1732
1733static void l2cap_sock_destruct(struct sock *sk)
1734{
1735 BT_DBG("sk %p", sk);
1736
1737 if (l2cap_pi(sk)->chan) {
1738 l2cap_pi(sk)->chan->data = NULL;
1739 l2cap_chan_put(l2cap_pi(sk)->chan);
1740 }
1741
1742 if (l2cap_pi(sk)->rx_busy_skb) {
1743 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1744 l2cap_pi(sk)->rx_busy_skb = NULL;
1745 }
1746
1747 skb_queue_purge(&sk->sk_receive_queue);
1748 skb_queue_purge(&sk->sk_write_queue);
1749}
1750
1751static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1752 int *msg_namelen)
1753{
1754 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1755
1756 memset(la, 0, sizeof(struct sockaddr_l2));
1757 la->l2_family = AF_BLUETOOTH;
1758 la->l2_psm = bt_cb(skb)->l2cap.psm;
1759 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr);
1760
1761 *msg_namelen = sizeof(struct sockaddr_l2);
1762}
1763
1764static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1765{
1766 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1767
1768 BT_DBG("sk %p", sk);
1769
1770 if (parent) {
1771 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1772
1773 sk->sk_type = parent->sk_type;
1774 bt_sk(sk)->flags = bt_sk(parent)->flags;
1775
1776 chan->chan_type = pchan->chan_type;
1777 chan->imtu = pchan->imtu;
1778 chan->omtu = pchan->omtu;
1779 chan->conf_state = pchan->conf_state;
1780 chan->mode = pchan->mode;
1781 chan->fcs = pchan->fcs;
1782 chan->max_tx = pchan->max_tx;
1783 chan->tx_win = pchan->tx_win;
1784 chan->tx_win_max = pchan->tx_win_max;
1785 chan->sec_level = pchan->sec_level;
1786 chan->flags = pchan->flags;
1787 chan->tx_credits = pchan->tx_credits;
1788 chan->rx_credits = pchan->rx_credits;
1789
1790 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1791 chan->scid = pchan->scid;
1792 chan->dcid = pchan->scid;
1793 }
1794
1795 security_sk_clone(parent, sk);
1796 } else {
1797 switch (sk->sk_type) {
1798 case SOCK_RAW:
1799 chan->chan_type = L2CAP_CHAN_RAW;
1800 break;
1801 case SOCK_DGRAM:
1802 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1803 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1804 break;
1805 case SOCK_SEQPACKET:
1806 case SOCK_STREAM:
1807 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1808 break;
1809 }
1810
1811 chan->imtu = L2CAP_DEFAULT_MTU;
1812 chan->omtu = 0;
1813 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1814 chan->mode = L2CAP_MODE_ERTM;
1815 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1816 } else {
1817 chan->mode = L2CAP_MODE_BASIC;
1818 }
1819
1820 l2cap_chan_set_defaults(chan);
1821 }
1822
1823 /* Default config options */
1824 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1825
1826 chan->data = sk;
1827 chan->ops = &l2cap_chan_ops;
1828}
1829
1830static struct proto l2cap_proto = {
1831 .name = "L2CAP",
1832 .owner = THIS_MODULE,
1833 .obj_size = sizeof(struct l2cap_pinfo)
1834};
1835
1836static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1837 int proto, gfp_t prio, int kern)
1838{
1839 struct sock *sk;
1840 struct l2cap_chan *chan;
1841
1842 sk = bt_sock_alloc(net, sock, &l2cap_proto, proto, prio, kern);
1843 if (!sk)
1844 return NULL;
1845
1846 sk->sk_destruct = l2cap_sock_destruct;
1847 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1848
1849 chan = l2cap_chan_create();
1850 if (!chan) {
1851 sk_free(sk);
1852 return NULL;
1853 }
1854
1855 l2cap_chan_hold(chan);
1856
1857 l2cap_pi(sk)->chan = chan;
1858
1859 return sk;
1860}
1861
1862static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1863 int kern)
1864{
1865 struct sock *sk;
1866
1867 BT_DBG("sock %p", sock);
1868
1869 sock->state = SS_UNCONNECTED;
1870
1871 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1872 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1873 return -ESOCKTNOSUPPORT;
1874
1875 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1876 return -EPERM;
1877
1878 sock->ops = &l2cap_sock_ops;
1879
1880 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
1881 if (!sk)
1882 return -ENOMEM;
1883
1884 l2cap_sock_init(sk, NULL);
1885 bt_sock_link(&l2cap_sk_list, sk);
1886 return 0;
1887}
1888
1889static const struct proto_ops l2cap_sock_ops = {
1890 .family = PF_BLUETOOTH,
1891 .owner = THIS_MODULE,
1892 .release = l2cap_sock_release,
1893 .bind = l2cap_sock_bind,
1894 .connect = l2cap_sock_connect,
1895 .listen = l2cap_sock_listen,
1896 .accept = l2cap_sock_accept,
1897 .getname = l2cap_sock_getname,
1898 .sendmsg = l2cap_sock_sendmsg,
1899 .recvmsg = l2cap_sock_recvmsg,
1900 .poll = bt_sock_poll,
1901 .ioctl = bt_sock_ioctl,
1902 .gettstamp = sock_gettstamp,
1903 .mmap = sock_no_mmap,
1904 .socketpair = sock_no_socketpair,
1905 .shutdown = l2cap_sock_shutdown,
1906 .setsockopt = l2cap_sock_setsockopt,
1907 .getsockopt = l2cap_sock_getsockopt
1908};
1909
1910static const struct net_proto_family l2cap_sock_family_ops = {
1911 .family = PF_BLUETOOTH,
1912 .owner = THIS_MODULE,
1913 .create = l2cap_sock_create,
1914};
1915
1916int __init l2cap_init_sockets(void)
1917{
1918 int err;
1919
1920 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1921
1922 err = proto_register(&l2cap_proto, 0);
1923 if (err < 0)
1924 return err;
1925
1926 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1927 if (err < 0) {
1928 BT_ERR("L2CAP socket registration failed");
1929 goto error;
1930 }
1931
1932 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1933 NULL);
1934 if (err < 0) {
1935 BT_ERR("Failed to create L2CAP proc file");
1936 bt_sock_unregister(BTPROTO_L2CAP);
1937 goto error;
1938 }
1939
1940 BT_INFO("L2CAP socket layer initialized");
1941
1942 return 0;
1943
1944error:
1945 proto_unregister(&l2cap_proto);
1946 return err;
1947}
1948
1949void l2cap_cleanup_sockets(void)
1950{
1951 bt_procfs_cleanup(&init_net, "l2cap");
1952 bt_sock_unregister(BTPROTO_L2CAP);
1953 proto_unregister(&l2cap_proto);
1954}