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Bluetooth: Add debug logs to help track locking issues
[deliverable/linux.git] / net / bluetooth / l2cap_sock.c
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
33 #include <net/bluetooth/bluetooth.h>
34 #include <net/bluetooth/hci_core.h>
35 #include <net/bluetooth/l2cap.h>
36
37 #include "smp.h"
38
39 static struct bt_sock_list l2cap_sk_list = {
40 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
41 };
42
43 static const struct proto_ops l2cap_sock_ops;
44 static void l2cap_sock_init(struct sock *sk, struct sock *parent);
45 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
46 int proto, gfp_t prio);
47
48 bool l2cap_is_socket(struct socket *sock)
49 {
50 return sock && sock->ops == &l2cap_sock_ops;
51 }
52 EXPORT_SYMBOL(l2cap_is_socket);
53
54 static int l2cap_validate_bredr_psm(u16 psm)
55 {
56 /* PSM must be odd and lsb of upper byte must be 0 */
57 if ((psm & 0x0101) != 0x0001)
58 return -EINVAL;
59
60 /* Restrict usage of well-known PSMs */
61 if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE))
62 return -EACCES;
63
64 return 0;
65 }
66
67 static int l2cap_validate_le_psm(u16 psm)
68 {
69 /* Valid LE_PSM ranges are defined only until 0x00ff */
70 if (psm > 0x00ff)
71 return -EINVAL;
72
73 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
74 if (psm <= 0x007f && !capable(CAP_NET_BIND_SERVICE))
75 return -EACCES;
76
77 return 0;
78 }
79
80 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
81 {
82 struct sock *sk = sock->sk;
83 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
84 struct sockaddr_l2 la;
85 int len, err = 0;
86
87 BT_DBG("sk %p", sk);
88
89 if (!addr || addr->sa_family != AF_BLUETOOTH)
90 return -EINVAL;
91
92 memset(&la, 0, sizeof(la));
93 len = min_t(unsigned int, sizeof(la), alen);
94 memcpy(&la, addr, len);
95
96 if (la.l2_cid && la.l2_psm)
97 return -EINVAL;
98
99 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
100 return -EINVAL;
101
102 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
103 /* We only allow ATT user space socket */
104 if (la.l2_cid &&
105 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
106 return -EINVAL;
107 }
108
109 lock_sock(sk);
110
111 if (sk->sk_state != BT_OPEN) {
112 err = -EBADFD;
113 goto done;
114 }
115
116 if (la.l2_psm) {
117 __u16 psm = __le16_to_cpu(la.l2_psm);
118
119 if (la.l2_bdaddr_type == BDADDR_BREDR)
120 err = l2cap_validate_bredr_psm(psm);
121 else
122 err = l2cap_validate_le_psm(psm);
123
124 if (err)
125 goto done;
126 }
127
128 if (la.l2_cid)
129 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
130 else
131 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
132
133 if (err < 0)
134 goto done;
135
136 switch (chan->chan_type) {
137 case L2CAP_CHAN_CONN_LESS:
138 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP)
139 chan->sec_level = BT_SECURITY_SDP;
140 break;
141 case L2CAP_CHAN_CONN_ORIENTED:
142 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP ||
143 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM)
144 chan->sec_level = BT_SECURITY_SDP;
145 break;
146 case L2CAP_CHAN_RAW:
147 chan->sec_level = BT_SECURITY_SDP;
148 break;
149 case L2CAP_CHAN_FIXED:
150 /* Fixed channels default to the L2CAP core not holding a
151 * hci_conn reference for them. For fixed channels mapping to
152 * L2CAP sockets we do want to hold a reference so set the
153 * appropriate flag to request it.
154 */
155 set_bit(FLAG_HOLD_HCI_CONN, &chan->flags);
156 break;
157 }
158
159 bacpy(&chan->src, &la.l2_bdaddr);
160 chan->src_type = la.l2_bdaddr_type;
161
162 if (chan->psm && bdaddr_type_is_le(chan->src_type))
163 chan->mode = L2CAP_MODE_LE_FLOWCTL;
164
165 chan->state = BT_BOUND;
166 sk->sk_state = BT_BOUND;
167
168 done:
169 release_sock(sk);
170 return err;
171 }
172
173 static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
174 int alen, int flags)
175 {
176 struct sock *sk = sock->sk;
177 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
178 struct sockaddr_l2 la;
179 int len, err = 0;
180
181 BT_DBG("sk %p", sk);
182
183 if (!addr || alen < sizeof(addr->sa_family) ||
184 addr->sa_family != AF_BLUETOOTH)
185 return -EINVAL;
186
187 memset(&la, 0, sizeof(la));
188 len = min_t(unsigned int, sizeof(la), alen);
189 memcpy(&la, addr, len);
190
191 if (la.l2_cid && la.l2_psm)
192 return -EINVAL;
193
194 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
195 return -EINVAL;
196
197 /* Check that the socket wasn't bound to something that
198 * conflicts with the address given to connect(). If chan->src
199 * is BDADDR_ANY it means bind() was never used, in which case
200 * chan->src_type and la.l2_bdaddr_type do not need to match.
201 */
202 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
203 bdaddr_type_is_le(la.l2_bdaddr_type)) {
204 /* Old user space versions will try to incorrectly bind
205 * the ATT socket using BDADDR_BREDR. We need to accept
206 * this and fix up the source address type only when
207 * both the source CID and destination CID indicate
208 * ATT. Anything else is an invalid combination.
209 */
210 if (chan->scid != L2CAP_CID_ATT ||
211 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
212 return -EINVAL;
213
214 /* We don't have the hdev available here to make a
215 * better decision on random vs public, but since all
216 * user space versions that exhibit this issue anyway do
217 * not support random local addresses assuming public
218 * here is good enough.
219 */
220 chan->src_type = BDADDR_LE_PUBLIC;
221 }
222
223 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
224 return -EINVAL;
225
226 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
227 /* We only allow ATT user space socket */
228 if (la.l2_cid &&
229 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
230 return -EINVAL;
231 }
232
233 if (chan->psm && bdaddr_type_is_le(chan->src_type))
234 chan->mode = L2CAP_MODE_LE_FLOWCTL;
235
236 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
237 &la.l2_bdaddr, la.l2_bdaddr_type);
238 if (err)
239 return err;
240
241 lock_sock(sk);
242
243 err = bt_sock_wait_state(sk, BT_CONNECTED,
244 sock_sndtimeo(sk, flags & O_NONBLOCK));
245
246 release_sock(sk);
247
248 return err;
249 }
250
251 static int l2cap_sock_listen(struct socket *sock, int backlog)
252 {
253 struct sock *sk = sock->sk;
254 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
255 int err = 0;
256
257 BT_DBG("sk %p backlog %d", sk, backlog);
258
259 lock_sock(sk);
260
261 if (sk->sk_state != BT_BOUND) {
262 err = -EBADFD;
263 goto done;
264 }
265
266 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
267 err = -EINVAL;
268 goto done;
269 }
270
271 switch (chan->mode) {
272 case L2CAP_MODE_BASIC:
273 case L2CAP_MODE_LE_FLOWCTL:
274 break;
275 case L2CAP_MODE_ERTM:
276 case L2CAP_MODE_STREAMING:
277 if (!disable_ertm)
278 break;
279 /* fall through */
280 default:
281 err = -EOPNOTSUPP;
282 goto done;
283 }
284
285 sk->sk_max_ack_backlog = backlog;
286 sk->sk_ack_backlog = 0;
287
288 /* Listening channels need to use nested locking in order not to
289 * cause lockdep warnings when the created child channels end up
290 * being locked in the same thread as the parent channel.
291 */
292 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
293
294 chan->state = BT_LISTEN;
295 sk->sk_state = BT_LISTEN;
296
297 done:
298 release_sock(sk);
299 return err;
300 }
301
302 static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
303 int flags)
304 {
305 DECLARE_WAITQUEUE(wait, current);
306 struct sock *sk = sock->sk, *nsk;
307 long timeo;
308 int err = 0;
309
310 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
311
312 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
313
314 BT_DBG("sk %p timeo %ld", sk, timeo);
315
316 /* Wait for an incoming connection. (wake-one). */
317 add_wait_queue_exclusive(sk_sleep(sk), &wait);
318 while (1) {
319 set_current_state(TASK_INTERRUPTIBLE);
320
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 timeo = schedule_timeout(timeo);
342 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
343 }
344 __set_current_state(TASK_RUNNING);
345 remove_wait_queue(sk_sleep(sk), &wait);
346
347 if (err)
348 goto done;
349
350 newsock->state = SS_CONNECTED;
351
352 BT_DBG("new socket %p", nsk);
353
354 done:
355 release_sock(sk);
356 return err;
357 }
358
359 static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
360 int *len, int peer)
361 {
362 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
363 struct sock *sk = sock->sk;
364 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
365
366 BT_DBG("sock %p, sk %p", sock, sk);
367
368 if (peer && sk->sk_state != BT_CONNECTED &&
369 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 &&
370 sk->sk_state != BT_CONFIG)
371 return -ENOTCONN;
372
373 memset(la, 0, sizeof(struct sockaddr_l2));
374 addr->sa_family = AF_BLUETOOTH;
375 *len = sizeof(struct sockaddr_l2);
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 0;
390 }
391
392 static 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
495 static 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
615 static 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
631 static 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
743 static 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_HIGH) {
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 break;
798 set_bit(FLAG_PENDING_SECURITY, &chan->flags);
799 sk->sk_state = BT_CONFIG;
800 chan->state = BT_CONFIG;
801
802 /* or for ACL link */
803 } else if ((sk->sk_state == BT_CONNECT2 &&
804 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
805 sk->sk_state == BT_CONNECTED) {
806 if (!l2cap_chan_check_security(chan, true))
807 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
808 else
809 sk->sk_state_change(sk);
810 } else {
811 err = -EINVAL;
812 }
813 break;
814
815 case BT_DEFER_SETUP:
816 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
817 err = -EINVAL;
818 break;
819 }
820
821 if (get_user(opt, (u32 __user *) optval)) {
822 err = -EFAULT;
823 break;
824 }
825
826 if (opt) {
827 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
828 set_bit(FLAG_DEFER_SETUP, &chan->flags);
829 } else {
830 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
831 clear_bit(FLAG_DEFER_SETUP, &chan->flags);
832 }
833 break;
834
835 case BT_FLUSHABLE:
836 if (get_user(opt, (u32 __user *) optval)) {
837 err = -EFAULT;
838 break;
839 }
840
841 if (opt > BT_FLUSHABLE_ON) {
842 err = -EINVAL;
843 break;
844 }
845
846 if (opt == BT_FLUSHABLE_OFF) {
847 conn = chan->conn;
848 /* proceed further only when we have l2cap_conn and
849 No Flush support in the LM */
850 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
851 err = -EINVAL;
852 break;
853 }
854 }
855
856 if (opt)
857 set_bit(FLAG_FLUSHABLE, &chan->flags);
858 else
859 clear_bit(FLAG_FLUSHABLE, &chan->flags);
860 break;
861
862 case BT_POWER:
863 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
864 chan->chan_type != L2CAP_CHAN_RAW) {
865 err = -EINVAL;
866 break;
867 }
868
869 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
870
871 len = min_t(unsigned int, sizeof(pwr), optlen);
872 if (copy_from_user((char *) &pwr, optval, len)) {
873 err = -EFAULT;
874 break;
875 }
876
877 if (pwr.force_active)
878 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
879 else
880 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
881 break;
882
883 case BT_CHANNEL_POLICY:
884 if (get_user(opt, (u32 __user *) optval)) {
885 err = -EFAULT;
886 break;
887 }
888
889 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
890 err = -EINVAL;
891 break;
892 }
893
894 if (chan->mode != L2CAP_MODE_ERTM &&
895 chan->mode != L2CAP_MODE_STREAMING) {
896 err = -EOPNOTSUPP;
897 break;
898 }
899
900 chan->chan_policy = (u8) opt;
901
902 if (sk->sk_state == BT_CONNECTED &&
903 chan->move_role == L2CAP_MOVE_ROLE_NONE)
904 l2cap_move_start(chan);
905
906 break;
907
908 case BT_SNDMTU:
909 if (!bdaddr_type_is_le(chan->src_type)) {
910 err = -EINVAL;
911 break;
912 }
913
914 /* Setting is not supported as it's the remote side that
915 * decides this.
916 */
917 err = -EPERM;
918 break;
919
920 case BT_RCVMTU:
921 if (!bdaddr_type_is_le(chan->src_type)) {
922 err = -EINVAL;
923 break;
924 }
925
926 if (sk->sk_state == BT_CONNECTED) {
927 err = -EISCONN;
928 break;
929 }
930
931 if (get_user(opt, (u32 __user *) optval)) {
932 err = -EFAULT;
933 break;
934 }
935
936 chan->imtu = opt;
937 break;
938
939 default:
940 err = -ENOPROTOOPT;
941 break;
942 }
943
944 release_sock(sk);
945 return err;
946 }
947
948 static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
949 struct msghdr *msg, size_t len)
950 {
951 struct sock *sk = sock->sk;
952 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
953 int err;
954
955 BT_DBG("sock %p, sk %p", sock, sk);
956
957 err = sock_error(sk);
958 if (err)
959 return err;
960
961 if (msg->msg_flags & MSG_OOB)
962 return -EOPNOTSUPP;
963
964 if (sk->sk_state != BT_CONNECTED)
965 return -ENOTCONN;
966
967 lock_sock(sk);
968 err = bt_sock_wait_ready(sk, msg->msg_flags);
969 release_sock(sk);
970 if (err)
971 return err;
972
973 l2cap_chan_lock(chan);
974 err = l2cap_chan_send(chan, msg, len);
975 l2cap_chan_unlock(chan);
976
977 return err;
978 }
979
980 static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
981 struct msghdr *msg, size_t len, int flags)
982 {
983 struct sock *sk = sock->sk;
984 struct l2cap_pinfo *pi = l2cap_pi(sk);
985 int err;
986
987 lock_sock(sk);
988
989 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
990 &bt_sk(sk)->flags)) {
991 if (bdaddr_type_is_le(pi->chan->src_type)) {
992 sk->sk_state = BT_CONNECTED;
993 pi->chan->state = BT_CONNECTED;
994 __l2cap_le_connect_rsp_defer(pi->chan);
995 } else {
996 sk->sk_state = BT_CONFIG;
997 pi->chan->state = BT_CONFIG;
998 __l2cap_connect_rsp_defer(pi->chan);
999 }
1000
1001 err = 0;
1002 goto done;
1003 }
1004
1005 release_sock(sk);
1006
1007 if (sock->type == SOCK_STREAM)
1008 err = bt_sock_stream_recvmsg(iocb, sock, msg, len, flags);
1009 else
1010 err = bt_sock_recvmsg(iocb, sock, msg, len, flags);
1011
1012 if (pi->chan->mode != L2CAP_MODE_ERTM)
1013 return err;
1014
1015 /* Attempt to put pending rx data in the socket buffer */
1016
1017 lock_sock(sk);
1018
1019 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
1020 goto done;
1021
1022 if (pi->rx_busy_skb) {
1023 if (!sock_queue_rcv_skb(sk, pi->rx_busy_skb))
1024 pi->rx_busy_skb = NULL;
1025 else
1026 goto done;
1027 }
1028
1029 /* Restore data flow when half of the receive buffer is
1030 * available. This avoids resending large numbers of
1031 * frames.
1032 */
1033 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1034 l2cap_chan_busy(pi->chan, 0);
1035
1036 done:
1037 release_sock(sk);
1038 return err;
1039 }
1040
1041 /* Kill socket (only if zapped and orphan)
1042 * Must be called on unlocked socket.
1043 */
1044 static void l2cap_sock_kill(struct sock *sk)
1045 {
1046 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1047 return;
1048
1049 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
1050
1051 /* Kill poor orphan */
1052
1053 l2cap_chan_put(l2cap_pi(sk)->chan);
1054 sock_set_flag(sk, SOCK_DEAD);
1055 sock_put(sk);
1056 }
1057
1058 static int __l2cap_wait_ack(struct sock *sk)
1059 {
1060 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1061 DECLARE_WAITQUEUE(wait, current);
1062 int err = 0;
1063 int timeo = HZ/5;
1064
1065 add_wait_queue(sk_sleep(sk), &wait);
1066 set_current_state(TASK_INTERRUPTIBLE);
1067 while (chan->unacked_frames > 0 && chan->conn) {
1068 if (!timeo)
1069 timeo = HZ/5;
1070
1071 if (signal_pending(current)) {
1072 err = sock_intr_errno(timeo);
1073 break;
1074 }
1075
1076 release_sock(sk);
1077 timeo = schedule_timeout(timeo);
1078 lock_sock(sk);
1079 set_current_state(TASK_INTERRUPTIBLE);
1080
1081 err = sock_error(sk);
1082 if (err)
1083 break;
1084 }
1085 set_current_state(TASK_RUNNING);
1086 remove_wait_queue(sk_sleep(sk), &wait);
1087 return err;
1088 }
1089
1090 static int l2cap_sock_shutdown(struct socket *sock, int how)
1091 {
1092 struct sock *sk = sock->sk;
1093 struct l2cap_chan *chan;
1094 struct l2cap_conn *conn;
1095 int err = 0;
1096
1097 BT_DBG("sock %p, sk %p", sock, sk);
1098
1099 if (!sk)
1100 return 0;
1101
1102 chan = l2cap_pi(sk)->chan;
1103 conn = chan->conn;
1104
1105 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1106
1107 if (conn)
1108 mutex_lock(&conn->chan_lock);
1109
1110 l2cap_chan_lock(chan);
1111 lock_sock(sk);
1112
1113 if (!sk->sk_shutdown) {
1114 if (chan->mode == L2CAP_MODE_ERTM)
1115 err = __l2cap_wait_ack(sk);
1116
1117 sk->sk_shutdown = SHUTDOWN_MASK;
1118
1119 release_sock(sk);
1120 l2cap_chan_close(chan, 0);
1121 lock_sock(sk);
1122
1123 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1124 !(current->flags & PF_EXITING))
1125 err = bt_sock_wait_state(sk, BT_CLOSED,
1126 sk->sk_lingertime);
1127 }
1128
1129 if (!err && sk->sk_err)
1130 err = -sk->sk_err;
1131
1132 release_sock(sk);
1133 l2cap_chan_unlock(chan);
1134
1135 if (conn)
1136 mutex_unlock(&conn->chan_lock);
1137
1138 return err;
1139 }
1140
1141 static int l2cap_sock_release(struct socket *sock)
1142 {
1143 struct sock *sk = sock->sk;
1144 int err;
1145
1146 BT_DBG("sock %p, sk %p", sock, sk);
1147
1148 if (!sk)
1149 return 0;
1150
1151 bt_sock_unlink(&l2cap_sk_list, sk);
1152
1153 err = l2cap_sock_shutdown(sock, 2);
1154
1155 sock_orphan(sk);
1156 l2cap_sock_kill(sk);
1157 return err;
1158 }
1159
1160 static void l2cap_sock_cleanup_listen(struct sock *parent)
1161 {
1162 struct sock *sk;
1163
1164 BT_DBG("parent %p state %s", parent,
1165 state_to_string(parent->sk_state));
1166
1167 /* Close not yet accepted channels */
1168 while ((sk = bt_accept_dequeue(parent, NULL))) {
1169 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1170
1171 BT_DBG("child chan %p state %s", chan,
1172 state_to_string(chan->state));
1173
1174 l2cap_chan_lock(chan);
1175 __clear_chan_timer(chan);
1176 l2cap_chan_close(chan, ECONNRESET);
1177 l2cap_chan_unlock(chan);
1178
1179 l2cap_sock_kill(sk);
1180 }
1181 }
1182
1183 static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1184 {
1185 struct sock *sk, *parent = chan->data;
1186
1187 lock_sock(parent);
1188
1189 /* Check for backlog size */
1190 if (sk_acceptq_is_full(parent)) {
1191 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1192 release_sock(parent);
1193 return NULL;
1194 }
1195
1196 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1197 GFP_ATOMIC);
1198 if (!sk) {
1199 release_sock(parent);
1200 return NULL;
1201 }
1202
1203 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1204
1205 l2cap_sock_init(sk, parent);
1206
1207 bt_accept_enqueue(parent, sk);
1208
1209 release_sock(parent);
1210
1211 return l2cap_pi(sk)->chan;
1212 }
1213
1214 static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1215 {
1216 struct sock *sk = chan->data;
1217 int err;
1218
1219 lock_sock(sk);
1220
1221 if (l2cap_pi(sk)->rx_busy_skb) {
1222 err = -ENOMEM;
1223 goto done;
1224 }
1225
1226 err = sock_queue_rcv_skb(sk, skb);
1227
1228 /* For ERTM, handle one skb that doesn't fit into the recv
1229 * buffer. This is important to do because the data frames
1230 * have already been acked, so the skb cannot be discarded.
1231 *
1232 * Notify the l2cap core that the buffer is full, so the
1233 * LOCAL_BUSY state is entered and no more frames are
1234 * acked and reassembled until there is buffer space
1235 * available.
1236 */
1237 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1238 l2cap_pi(sk)->rx_busy_skb = skb;
1239 l2cap_chan_busy(chan, 1);
1240 err = 0;
1241 }
1242
1243 done:
1244 release_sock(sk);
1245
1246 return err;
1247 }
1248
1249 static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1250 {
1251 struct sock *sk = chan->data;
1252
1253 l2cap_sock_kill(sk);
1254 }
1255
1256 static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1257 {
1258 struct sock *sk = chan->data;
1259 struct sock *parent;
1260
1261 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1262
1263 /* This callback can be called both for server (BT_LISTEN)
1264 * sockets as well as "normal" ones. To avoid lockdep warnings
1265 * with child socket locking (through l2cap_sock_cleanup_listen)
1266 * we need separation into separate nesting levels. The simplest
1267 * way to accomplish this is to inherit the nesting level used
1268 * for the channel.
1269 */
1270 lock_sock_nested(sk, atomic_read(&chan->nesting));
1271
1272 parent = bt_sk(sk)->parent;
1273
1274 sock_set_flag(sk, SOCK_ZAPPED);
1275
1276 switch (chan->state) {
1277 case BT_OPEN:
1278 case BT_BOUND:
1279 case BT_CLOSED:
1280 break;
1281 case BT_LISTEN:
1282 l2cap_sock_cleanup_listen(sk);
1283 sk->sk_state = BT_CLOSED;
1284 chan->state = BT_CLOSED;
1285
1286 break;
1287 default:
1288 sk->sk_state = BT_CLOSED;
1289 chan->state = BT_CLOSED;
1290
1291 sk->sk_err = err;
1292
1293 if (parent) {
1294 bt_accept_unlink(sk);
1295 parent->sk_data_ready(parent);
1296 } else {
1297 sk->sk_state_change(sk);
1298 }
1299
1300 break;
1301 }
1302
1303 release_sock(sk);
1304 }
1305
1306 static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1307 int err)
1308 {
1309 struct sock *sk = chan->data;
1310
1311 sk->sk_state = state;
1312
1313 if (err)
1314 sk->sk_err = err;
1315 }
1316
1317 static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1318 unsigned long hdr_len,
1319 unsigned long len, int nb)
1320 {
1321 struct sock *sk = chan->data;
1322 struct sk_buff *skb;
1323 int err;
1324
1325 l2cap_chan_unlock(chan);
1326 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1327 l2cap_chan_lock(chan);
1328
1329 if (!skb)
1330 return ERR_PTR(err);
1331
1332 skb->priority = sk->sk_priority;
1333
1334 bt_cb(skb)->chan = chan;
1335
1336 return skb;
1337 }
1338
1339 static int l2cap_sock_memcpy_fromiovec_cb(struct l2cap_chan *chan,
1340 unsigned char *kdata,
1341 struct iovec *iov, int len)
1342 {
1343 return memcpy_fromiovec(kdata, iov, len);
1344 }
1345
1346 static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1347 {
1348 struct sock *sk = chan->data;
1349 struct sock *parent;
1350
1351 lock_sock(sk);
1352
1353 parent = bt_sk(sk)->parent;
1354
1355 BT_DBG("sk %p, parent %p", sk, parent);
1356
1357 sk->sk_state = BT_CONNECTED;
1358 sk->sk_state_change(sk);
1359
1360 if (parent)
1361 parent->sk_data_ready(parent);
1362
1363 release_sock(sk);
1364 }
1365
1366 static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1367 {
1368 struct sock *parent, *sk = chan->data;
1369
1370 lock_sock(sk);
1371
1372 parent = bt_sk(sk)->parent;
1373 if (parent)
1374 parent->sk_data_ready(parent);
1375
1376 release_sock(sk);
1377 }
1378
1379 static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1380 {
1381 struct sock *sk = chan->data;
1382
1383 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1384 sk->sk_state = BT_CONNECTED;
1385 chan->state = BT_CONNECTED;
1386 }
1387
1388 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1389 sk->sk_state_change(sk);
1390 }
1391
1392 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1393 {
1394 struct sock *sk = chan->data;
1395
1396 lock_sock(sk);
1397 sk->sk_shutdown = SHUTDOWN_MASK;
1398 release_sock(sk);
1399 }
1400
1401 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1402 {
1403 struct sock *sk = chan->data;
1404
1405 return sk->sk_sndtimeo;
1406 }
1407
1408 static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1409 {
1410 struct sock *sk = chan->data;
1411
1412 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1413 sk->sk_state_change(sk);
1414 }
1415
1416 static const struct l2cap_ops l2cap_chan_ops = {
1417 .name = "L2CAP Socket Interface",
1418 .new_connection = l2cap_sock_new_connection_cb,
1419 .recv = l2cap_sock_recv_cb,
1420 .close = l2cap_sock_close_cb,
1421 .teardown = l2cap_sock_teardown_cb,
1422 .state_change = l2cap_sock_state_change_cb,
1423 .ready = l2cap_sock_ready_cb,
1424 .defer = l2cap_sock_defer_cb,
1425 .resume = l2cap_sock_resume_cb,
1426 .suspend = l2cap_sock_suspend_cb,
1427 .set_shutdown = l2cap_sock_set_shutdown_cb,
1428 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1429 .alloc_skb = l2cap_sock_alloc_skb_cb,
1430 .memcpy_fromiovec = l2cap_sock_memcpy_fromiovec_cb,
1431 };
1432
1433 static void l2cap_sock_destruct(struct sock *sk)
1434 {
1435 BT_DBG("sk %p", sk);
1436
1437 if (l2cap_pi(sk)->chan)
1438 l2cap_chan_put(l2cap_pi(sk)->chan);
1439
1440 if (l2cap_pi(sk)->rx_busy_skb) {
1441 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1442 l2cap_pi(sk)->rx_busy_skb = NULL;
1443 }
1444
1445 skb_queue_purge(&sk->sk_receive_queue);
1446 skb_queue_purge(&sk->sk_write_queue);
1447 }
1448
1449 static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1450 int *msg_namelen)
1451 {
1452 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1453
1454 memset(la, 0, sizeof(struct sockaddr_l2));
1455 la->l2_family = AF_BLUETOOTH;
1456 la->l2_psm = bt_cb(skb)->psm;
1457 bacpy(&la->l2_bdaddr, &bt_cb(skb)->bdaddr);
1458
1459 *msg_namelen = sizeof(struct sockaddr_l2);
1460 }
1461
1462 static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1463 {
1464 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1465
1466 BT_DBG("sk %p", sk);
1467
1468 if (parent) {
1469 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1470
1471 sk->sk_type = parent->sk_type;
1472 bt_sk(sk)->flags = bt_sk(parent)->flags;
1473
1474 chan->chan_type = pchan->chan_type;
1475 chan->imtu = pchan->imtu;
1476 chan->omtu = pchan->omtu;
1477 chan->conf_state = pchan->conf_state;
1478 chan->mode = pchan->mode;
1479 chan->fcs = pchan->fcs;
1480 chan->max_tx = pchan->max_tx;
1481 chan->tx_win = pchan->tx_win;
1482 chan->tx_win_max = pchan->tx_win_max;
1483 chan->sec_level = pchan->sec_level;
1484 chan->flags = pchan->flags;
1485 chan->tx_credits = pchan->tx_credits;
1486 chan->rx_credits = pchan->rx_credits;
1487
1488 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1489 chan->scid = pchan->scid;
1490 chan->dcid = pchan->scid;
1491 }
1492
1493 security_sk_clone(parent, sk);
1494 } else {
1495 switch (sk->sk_type) {
1496 case SOCK_RAW:
1497 chan->chan_type = L2CAP_CHAN_RAW;
1498 break;
1499 case SOCK_DGRAM:
1500 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1501 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1502 break;
1503 case SOCK_SEQPACKET:
1504 case SOCK_STREAM:
1505 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1506 break;
1507 }
1508
1509 chan->imtu = L2CAP_DEFAULT_MTU;
1510 chan->omtu = 0;
1511 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1512 chan->mode = L2CAP_MODE_ERTM;
1513 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1514 } else {
1515 chan->mode = L2CAP_MODE_BASIC;
1516 }
1517
1518 l2cap_chan_set_defaults(chan);
1519 }
1520
1521 /* Default config options */
1522 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1523
1524 chan->data = sk;
1525 chan->ops = &l2cap_chan_ops;
1526 }
1527
1528 static struct proto l2cap_proto = {
1529 .name = "L2CAP",
1530 .owner = THIS_MODULE,
1531 .obj_size = sizeof(struct l2cap_pinfo)
1532 };
1533
1534 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1535 int proto, gfp_t prio)
1536 {
1537 struct sock *sk;
1538 struct l2cap_chan *chan;
1539
1540 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
1541 if (!sk)
1542 return NULL;
1543
1544 sock_init_data(sock, sk);
1545 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1546
1547 sk->sk_destruct = l2cap_sock_destruct;
1548 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1549
1550 sock_reset_flag(sk, SOCK_ZAPPED);
1551
1552 sk->sk_protocol = proto;
1553 sk->sk_state = BT_OPEN;
1554
1555 chan = l2cap_chan_create();
1556 if (!chan) {
1557 sk_free(sk);
1558 return NULL;
1559 }
1560
1561 l2cap_chan_hold(chan);
1562
1563 l2cap_pi(sk)->chan = chan;
1564
1565 return sk;
1566 }
1567
1568 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1569 int kern)
1570 {
1571 struct sock *sk;
1572
1573 BT_DBG("sock %p", sock);
1574
1575 sock->state = SS_UNCONNECTED;
1576
1577 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1578 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1579 return -ESOCKTNOSUPPORT;
1580
1581 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1582 return -EPERM;
1583
1584 sock->ops = &l2cap_sock_ops;
1585
1586 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
1587 if (!sk)
1588 return -ENOMEM;
1589
1590 l2cap_sock_init(sk, NULL);
1591 bt_sock_link(&l2cap_sk_list, sk);
1592 return 0;
1593 }
1594
1595 static const struct proto_ops l2cap_sock_ops = {
1596 .family = PF_BLUETOOTH,
1597 .owner = THIS_MODULE,
1598 .release = l2cap_sock_release,
1599 .bind = l2cap_sock_bind,
1600 .connect = l2cap_sock_connect,
1601 .listen = l2cap_sock_listen,
1602 .accept = l2cap_sock_accept,
1603 .getname = l2cap_sock_getname,
1604 .sendmsg = l2cap_sock_sendmsg,
1605 .recvmsg = l2cap_sock_recvmsg,
1606 .poll = bt_sock_poll,
1607 .ioctl = bt_sock_ioctl,
1608 .mmap = sock_no_mmap,
1609 .socketpair = sock_no_socketpair,
1610 .shutdown = l2cap_sock_shutdown,
1611 .setsockopt = l2cap_sock_setsockopt,
1612 .getsockopt = l2cap_sock_getsockopt
1613 };
1614
1615 static const struct net_proto_family l2cap_sock_family_ops = {
1616 .family = PF_BLUETOOTH,
1617 .owner = THIS_MODULE,
1618 .create = l2cap_sock_create,
1619 };
1620
1621 int __init l2cap_init_sockets(void)
1622 {
1623 int err;
1624
1625 err = proto_register(&l2cap_proto, 0);
1626 if (err < 0)
1627 return err;
1628
1629 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1630 if (err < 0) {
1631 BT_ERR("L2CAP socket registration failed");
1632 goto error;
1633 }
1634
1635 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1636 NULL);
1637 if (err < 0) {
1638 BT_ERR("Failed to create L2CAP proc file");
1639 bt_sock_unregister(BTPROTO_L2CAP);
1640 goto error;
1641 }
1642
1643 BT_INFO("L2CAP socket layer initialized");
1644
1645 return 0;
1646
1647 error:
1648 proto_unregister(&l2cap_proto);
1649 return err;
1650 }
1651
1652 void l2cap_cleanup_sockets(void)
1653 {
1654 bt_procfs_cleanup(&init_net, "l2cap");
1655 bt_sock_unregister(BTPROTO_L2CAP);
1656 proto_unregister(&l2cap_proto);
1657 }
Linux kernel - Deliverables
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