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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
39static struct bt_sock_list l2cap_sk_list = {
40 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
41};
42
43static const struct proto_ops l2cap_sock_ops;
44static void l2cap_sock_init(struct sock *sk, struct sock *parent);
45static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
46 int proto, gfp_t prio, int kern);
47
48bool l2cap_is_socket(struct socket *sock)
49{
50 return sock && sock->ops == &l2cap_sock_ops;
51}
52EXPORT_SYMBOL(l2cap_is_socket);
53
54static 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 < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE))
62 return -EACCES;
63
64 return 0;
65}
66
67static int l2cap_validate_le_psm(u16 psm)
68{
69 /* Valid LE_PSM ranges are defined only until 0x00ff */
70 if (psm > L2CAP_PSM_LE_DYN_END)
71 return -EINVAL;
72
73 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
74 if (psm < L2CAP_PSM_LE_DYN_START && !capable(CAP_NET_BIND_SERVICE))
75 return -EACCES;
76
77 return 0;
78}
79
80static 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 bacpy(&chan->src, &la.l2_bdaddr);
129 chan->src_type = la.l2_bdaddr_type;
130
131 if (la.l2_cid)
132 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
133 else
134 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
135
136 if (err < 0)
137 goto done;
138
139 switch (chan->chan_type) {
140 case L2CAP_CHAN_CONN_LESS:
141 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP)
142 chan->sec_level = BT_SECURITY_SDP;
143 break;
144 case L2CAP_CHAN_CONN_ORIENTED:
145 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP ||
146 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM)
147 chan->sec_level = BT_SECURITY_SDP;
148 break;
149 case L2CAP_CHAN_RAW:
150 chan->sec_level = BT_SECURITY_SDP;
151 break;
152 case L2CAP_CHAN_FIXED:
153 /* Fixed channels default to the L2CAP core not holding a
154 * hci_conn reference for them. For fixed channels mapping to
155 * L2CAP sockets we do want to hold a reference so set the
156 * appropriate flag to request it.
157 */
158 set_bit(FLAG_HOLD_HCI_CONN, &chan->flags);
159 break;
160 }
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
168done:
169 release_sock(sk);
170 return err;
171}
172
173static 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
251static 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
297done:
298 release_sock(sk);
299 return err;
300}
301
302static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
303 int flags)
304{
305 DEFINE_WAIT_FUNC(wait, woken_wake_function);
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 if (sk->sk_state != BT_LISTEN) {
320 err = -EBADFD;
321 break;
322 }
323
324 nsk = bt_accept_dequeue(sk, newsock);
325 if (nsk)
326 break;
327
328 if (!timeo) {
329 err = -EAGAIN;
330 break;
331 }
332
333 if (signal_pending(current)) {
334 err = sock_intr_errno(timeo);
335 break;
336 }
337
338 release_sock(sk);
339
340 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
341
342 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
343 }
344 remove_wait_queue(sk_sleep(sk), &wait);
345
346 if (err)
347 goto done;
348
349 newsock->state = SS_CONNECTED;
350
351 BT_DBG("new socket %p", nsk);
352
353done:
354 release_sock(sk);
355 return err;
356}
357
358static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
359 int *len, int peer)
360{
361 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
362 struct sock *sk = sock->sk;
363 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
364
365 BT_DBG("sock %p, sk %p", sock, sk);
366
367 if (peer && sk->sk_state != BT_CONNECTED &&
368 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 &&
369 sk->sk_state != BT_CONFIG)
370 return -ENOTCONN;
371
372 memset(la, 0, sizeof(struct sockaddr_l2));
373 addr->sa_family = AF_BLUETOOTH;
374 *len = sizeof(struct sockaddr_l2);
375
376 la->l2_psm = chan->psm;
377
378 if (peer) {
379 bacpy(&la->l2_bdaddr, &chan->dst);
380 la->l2_cid = cpu_to_le16(chan->dcid);
381 la->l2_bdaddr_type = chan->dst_type;
382 } else {
383 bacpy(&la->l2_bdaddr, &chan->src);
384 la->l2_cid = cpu_to_le16(chan->scid);
385 la->l2_bdaddr_type = chan->src_type;
386 }
387
388 return 0;
389}
390
391static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
392 char __user *optval, int __user *optlen)
393{
394 struct sock *sk = sock->sk;
395 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
396 struct l2cap_options opts;
397 struct l2cap_conninfo cinfo;
398 int len, err = 0;
399 u32 opt;
400
401 BT_DBG("sk %p", sk);
402
403 if (get_user(len, optlen))
404 return -EFAULT;
405
406 lock_sock(sk);
407
408 switch (optname) {
409 case L2CAP_OPTIONS:
410 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
411 * legacy ATT code depends on getsockopt for
412 * L2CAP_OPTIONS we need to let this pass.
413 */
414 if (bdaddr_type_is_le(chan->src_type) &&
415 chan->scid != L2CAP_CID_ATT) {
416 err = -EINVAL;
417 break;
418 }
419
420 memset(&opts, 0, sizeof(opts));
421 opts.imtu = chan->imtu;
422 opts.omtu = chan->omtu;
423 opts.flush_to = chan->flush_to;
424 opts.mode = chan->mode;
425 opts.fcs = chan->fcs;
426 opts.max_tx = chan->max_tx;
427 opts.txwin_size = chan->tx_win;
428
429 len = min_t(unsigned int, len, sizeof(opts));
430 if (copy_to_user(optval, (char *) &opts, len))
431 err = -EFAULT;
432
433 break;
434
435 case L2CAP_LM:
436 switch (chan->sec_level) {
437 case BT_SECURITY_LOW:
438 opt = L2CAP_LM_AUTH;
439 break;
440 case BT_SECURITY_MEDIUM:
441 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
442 break;
443 case BT_SECURITY_HIGH:
444 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
445 L2CAP_LM_SECURE;
446 break;
447 case BT_SECURITY_FIPS:
448 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
449 L2CAP_LM_SECURE | L2CAP_LM_FIPS;
450 break;
451 default:
452 opt = 0;
453 break;
454 }
455
456 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
457 opt |= L2CAP_LM_MASTER;
458
459 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
460 opt |= L2CAP_LM_RELIABLE;
461
462 if (put_user(opt, (u32 __user *) optval))
463 err = -EFAULT;
464
465 break;
466
467 case L2CAP_CONNINFO:
468 if (sk->sk_state != BT_CONNECTED &&
469 !(sk->sk_state == BT_CONNECT2 &&
470 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
471 err = -ENOTCONN;
472 break;
473 }
474
475 memset(&cinfo, 0, sizeof(cinfo));
476 cinfo.hci_handle = chan->conn->hcon->handle;
477 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
478
479 len = min_t(unsigned int, len, sizeof(cinfo));
480 if (copy_to_user(optval, (char *) &cinfo, len))
481 err = -EFAULT;
482
483 break;
484
485 default:
486 err = -ENOPROTOOPT;
487 break;
488 }
489
490 release_sock(sk);
491 return err;
492}
493
494static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
495 char __user *optval, int __user *optlen)
496{
497 struct sock *sk = sock->sk;
498 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
499 struct bt_security sec;
500 struct bt_power pwr;
501 int len, err = 0;
502
503 BT_DBG("sk %p", sk);
504
505 if (level == SOL_L2CAP)
506 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
507
508 if (level != SOL_BLUETOOTH)
509 return -ENOPROTOOPT;
510
511 if (get_user(len, optlen))
512 return -EFAULT;
513
514 lock_sock(sk);
515
516 switch (optname) {
517 case BT_SECURITY:
518 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
519 chan->chan_type != L2CAP_CHAN_FIXED &&
520 chan->chan_type != L2CAP_CHAN_RAW) {
521 err = -EINVAL;
522 break;
523 }
524
525 memset(&sec, 0, sizeof(sec));
526 if (chan->conn) {
527 sec.level = chan->conn->hcon->sec_level;
528
529 if (sk->sk_state == BT_CONNECTED)
530 sec.key_size = chan->conn->hcon->enc_key_size;
531 } else {
532 sec.level = chan->sec_level;
533 }
534
535 len = min_t(unsigned int, len, sizeof(sec));
536 if (copy_to_user(optval, (char *) &sec, len))
537 err = -EFAULT;
538
539 break;
540
541 case BT_DEFER_SETUP:
542 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
543 err = -EINVAL;
544 break;
545 }
546
547 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
548 (u32 __user *) optval))
549 err = -EFAULT;
550
551 break;
552
553 case BT_FLUSHABLE:
554 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
555 (u32 __user *) optval))
556 err = -EFAULT;
557
558 break;
559
560 case BT_POWER:
561 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
562 && sk->sk_type != SOCK_RAW) {
563 err = -EINVAL;
564 break;
565 }
566
567 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
568
569 len = min_t(unsigned int, len, sizeof(pwr));
570 if (copy_to_user(optval, (char *) &pwr, len))
571 err = -EFAULT;
572
573 break;
574
575 case BT_CHANNEL_POLICY:
576 if (put_user(chan->chan_policy, (u32 __user *) optval))
577 err = -EFAULT;
578 break;
579
580 case BT_SNDMTU:
581 if (!bdaddr_type_is_le(chan->src_type)) {
582 err = -EINVAL;
583 break;
584 }
585
586 if (sk->sk_state != BT_CONNECTED) {
587 err = -ENOTCONN;
588 break;
589 }
590
591 if (put_user(chan->omtu, (u16 __user *) optval))
592 err = -EFAULT;
593 break;
594
595 case BT_RCVMTU:
596 if (!bdaddr_type_is_le(chan->src_type)) {
597 err = -EINVAL;
598 break;
599 }
600
601 if (put_user(chan->imtu, (u16 __user *) optval))
602 err = -EFAULT;
603 break;
604
605 default:
606 err = -ENOPROTOOPT;
607 break;
608 }
609
610 release_sock(sk);
611 return err;
612}
613
614static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
615{
616 switch (chan->scid) {
617 case L2CAP_CID_ATT:
618 if (mtu < L2CAP_LE_MIN_MTU)
619 return false;
620 break;
621
622 default:
623 if (mtu < L2CAP_DEFAULT_MIN_MTU)
624 return false;
625 }
626
627 return true;
628}
629
630static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
631 char __user *optval, unsigned int optlen)
632{
633 struct sock *sk = sock->sk;
634 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
635 struct l2cap_options opts;
636 int len, err = 0;
637 u32 opt;
638
639 BT_DBG("sk %p", sk);
640
641 lock_sock(sk);
642
643 switch (optname) {
644 case L2CAP_OPTIONS:
645 if (bdaddr_type_is_le(chan->src_type)) {
646 err = -EINVAL;
647 break;
648 }
649
650 if (sk->sk_state == BT_CONNECTED) {
651 err = -EINVAL;
652 break;
653 }
654
655 opts.imtu = chan->imtu;
656 opts.omtu = chan->omtu;
657 opts.flush_to = chan->flush_to;
658 opts.mode = chan->mode;
659 opts.fcs = chan->fcs;
660 opts.max_tx = chan->max_tx;
661 opts.txwin_size = chan->tx_win;
662
663 len = min_t(unsigned int, sizeof(opts), optlen);
664 if (copy_from_user((char *) &opts, optval, len)) {
665 err = -EFAULT;
666 break;
667 }
668
669 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
670 err = -EINVAL;
671 break;
672 }
673
674 if (!l2cap_valid_mtu(chan, opts.imtu)) {
675 err = -EINVAL;
676 break;
677 }
678
679 chan->mode = opts.mode;
680 switch (chan->mode) {
681 case L2CAP_MODE_LE_FLOWCTL:
682 break;
683 case L2CAP_MODE_BASIC:
684 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
685 break;
686 case L2CAP_MODE_ERTM:
687 case L2CAP_MODE_STREAMING:
688 if (!disable_ertm)
689 break;
690 /* fall through */
691 default:
692 err = -EINVAL;
693 break;
694 }
695
696 chan->imtu = opts.imtu;
697 chan->omtu = opts.omtu;
698 chan->fcs = opts.fcs;
699 chan->max_tx = opts.max_tx;
700 chan->tx_win = opts.txwin_size;
701 chan->flush_to = opts.flush_to;
702 break;
703
704 case L2CAP_LM:
705 if (get_user(opt, (u32 __user *) optval)) {
706 err = -EFAULT;
707 break;
708 }
709
710 if (opt & L2CAP_LM_FIPS) {
711 err = -EINVAL;
712 break;
713 }
714
715 if (opt & L2CAP_LM_AUTH)
716 chan->sec_level = BT_SECURITY_LOW;
717 if (opt & L2CAP_LM_ENCRYPT)
718 chan->sec_level = BT_SECURITY_MEDIUM;
719 if (opt & L2CAP_LM_SECURE)
720 chan->sec_level = BT_SECURITY_HIGH;
721
722 if (opt & L2CAP_LM_MASTER)
723 set_bit(FLAG_ROLE_SWITCH, &chan->flags);
724 else
725 clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
726
727 if (opt & L2CAP_LM_RELIABLE)
728 set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
729 else
730 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
731 break;
732
733 default:
734 err = -ENOPROTOOPT;
735 break;
736 }
737
738 release_sock(sk);
739 return err;
740}
741
742static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
743 char __user *optval, unsigned int optlen)
744{
745 struct sock *sk = sock->sk;
746 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
747 struct bt_security sec;
748 struct bt_power pwr;
749 struct l2cap_conn *conn;
750 int len, err = 0;
751 u32 opt;
752
753 BT_DBG("sk %p", sk);
754
755 if (level == SOL_L2CAP)
756 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
757
758 if (level != SOL_BLUETOOTH)
759 return -ENOPROTOOPT;
760
761 lock_sock(sk);
762
763 switch (optname) {
764 case BT_SECURITY:
765 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
766 chan->chan_type != L2CAP_CHAN_FIXED &&
767 chan->chan_type != L2CAP_CHAN_RAW) {
768 err = -EINVAL;
769 break;
770 }
771
772 sec.level = BT_SECURITY_LOW;
773
774 len = min_t(unsigned int, sizeof(sec), optlen);
775 if (copy_from_user((char *) &sec, optval, len)) {
776 err = -EFAULT;
777 break;
778 }
779
780 if (sec.level < BT_SECURITY_LOW ||
781 sec.level > BT_SECURITY_HIGH) {
782 err = -EINVAL;
783 break;
784 }
785
786 chan->sec_level = sec.level;
787
788 if (!chan->conn)
789 break;
790
791 conn = chan->conn;
792
793 /*change security for LE channels */
794 if (chan->scid == L2CAP_CID_ATT) {
795 if (smp_conn_security(conn->hcon, sec.level))
796 break;
797 set_bit(FLAG_PENDING_SECURITY, &chan->flags);
798 sk->sk_state = BT_CONFIG;
799 chan->state = BT_CONFIG;
800
801 /* or for ACL link */
802 } else if ((sk->sk_state == BT_CONNECT2 &&
803 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
804 sk->sk_state == BT_CONNECTED) {
805 if (!l2cap_chan_check_security(chan, true))
806 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
807 else
808 sk->sk_state_change(sk);
809 } else {
810 err = -EINVAL;
811 }
812 break;
813
814 case BT_DEFER_SETUP:
815 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
816 err = -EINVAL;
817 break;
818 }
819
820 if (get_user(opt, (u32 __user *) optval)) {
821 err = -EFAULT;
822 break;
823 }
824
825 if (opt) {
826 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
827 set_bit(FLAG_DEFER_SETUP, &chan->flags);
828 } else {
829 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
830 clear_bit(FLAG_DEFER_SETUP, &chan->flags);
831 }
832 break;
833
834 case BT_FLUSHABLE:
835 if (get_user(opt, (u32 __user *) optval)) {
836 err = -EFAULT;
837 break;
838 }
839
840 if (opt > BT_FLUSHABLE_ON) {
841 err = -EINVAL;
842 break;
843 }
844
845 if (opt == BT_FLUSHABLE_OFF) {
846 conn = chan->conn;
847 /* proceed further only when we have l2cap_conn and
848 No Flush support in the LM */
849 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
850 err = -EINVAL;
851 break;
852 }
853 }
854
855 if (opt)
856 set_bit(FLAG_FLUSHABLE, &chan->flags);
857 else
858 clear_bit(FLAG_FLUSHABLE, &chan->flags);
859 break;
860
861 case BT_POWER:
862 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
863 chan->chan_type != L2CAP_CHAN_RAW) {
864 err = -EINVAL;
865 break;
866 }
867
868 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
869
870 len = min_t(unsigned int, sizeof(pwr), optlen);
871 if (copy_from_user((char *) &pwr, optval, len)) {
872 err = -EFAULT;
873 break;
874 }
875
876 if (pwr.force_active)
877 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
878 else
879 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
880 break;
881
882 case BT_CHANNEL_POLICY:
883 if (get_user(opt, (u32 __user *) optval)) {
884 err = -EFAULT;
885 break;
886 }
887
888 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
889 err = -EINVAL;
890 break;
891 }
892
893 if (chan->mode != L2CAP_MODE_ERTM &&
894 chan->mode != L2CAP_MODE_STREAMING) {
895 err = -EOPNOTSUPP;
896 break;
897 }
898
899 chan->chan_policy = (u8) opt;
900
901 if (sk->sk_state == BT_CONNECTED &&
902 chan->move_role == L2CAP_MOVE_ROLE_NONE)
903 l2cap_move_start(chan);
904
905 break;
906
907 case BT_SNDMTU:
908 if (!bdaddr_type_is_le(chan->src_type)) {
909 err = -EINVAL;
910 break;
911 }
912
913 /* Setting is not supported as it's the remote side that
914 * decides this.
915 */
916 err = -EPERM;
917 break;
918
919 case BT_RCVMTU:
920 if (!bdaddr_type_is_le(chan->src_type)) {
921 err = -EINVAL;
922 break;
923 }
924
925 if (sk->sk_state == BT_CONNECTED) {
926 err = -EISCONN;
927 break;
928 }
929
930 if (get_user(opt, (u32 __user *) optval)) {
931 err = -EFAULT;
932 break;
933 }
934
935 chan->imtu = opt;
936 break;
937
938 default:
939 err = -ENOPROTOOPT;
940 break;
941 }
942
943 release_sock(sk);
944 return err;
945}
946
947static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg,
948 size_t len)
949{
950 struct sock *sk = sock->sk;
951 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
952 int err;
953
954 BT_DBG("sock %p, sk %p", sock, sk);
955
956 err = sock_error(sk);
957 if (err)
958 return err;
959
960 if (msg->msg_flags & MSG_OOB)
961 return -EOPNOTSUPP;
962
963 if (sk->sk_state != BT_CONNECTED)
964 return -ENOTCONN;
965
966 lock_sock(sk);
967 err = bt_sock_wait_ready(sk, msg->msg_flags);
968 release_sock(sk);
969 if (err)
970 return err;
971
972 l2cap_chan_lock(chan);
973 err = l2cap_chan_send(chan, msg, len);
974 l2cap_chan_unlock(chan);
975
976 return err;
977}
978
979static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg,
980 size_t len, int flags)
981{
982 struct sock *sk = sock->sk;
983 struct l2cap_pinfo *pi = l2cap_pi(sk);
984 int err;
985
986 lock_sock(sk);
987
988 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
989 &bt_sk(sk)->flags)) {
990 if (bdaddr_type_is_le(pi->chan->src_type)) {
991 sk->sk_state = BT_CONNECTED;
992 pi->chan->state = BT_CONNECTED;
993 __l2cap_le_connect_rsp_defer(pi->chan);
994 } else {
995 sk->sk_state = BT_CONFIG;
996 pi->chan->state = BT_CONFIG;
997 __l2cap_connect_rsp_defer(pi->chan);
998 }
999
1000 err = 0;
1001 goto done;
1002 }
1003
1004 release_sock(sk);
1005
1006 if (sock->type == SOCK_STREAM)
1007 err = bt_sock_stream_recvmsg(sock, msg, len, flags);
1008 else
1009 err = bt_sock_recvmsg(sock, msg, len, flags);
1010
1011 if (pi->chan->mode != L2CAP_MODE_ERTM)
1012 return err;
1013
1014 /* Attempt to put pending rx data in the socket buffer */
1015
1016 lock_sock(sk);
1017
1018 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
1019 goto done;
1020
1021 if (pi->rx_busy_skb) {
1022 if (!sock_queue_rcv_skb(sk, pi->rx_busy_skb))
1023 pi->rx_busy_skb = NULL;
1024 else
1025 goto done;
1026 }
1027
1028 /* Restore data flow when half of the receive buffer is
1029 * available. This avoids resending large numbers of
1030 * frames.
1031 */
1032 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1033 l2cap_chan_busy(pi->chan, 0);
1034
1035done:
1036 release_sock(sk);
1037 return err;
1038}
1039
1040/* Kill socket (only if zapped and orphan)
1041 * Must be called on unlocked socket.
1042 */
1043static void l2cap_sock_kill(struct sock *sk)
1044{
1045 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1046 return;
1047
1048 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
1049
1050 /* Kill poor orphan */
1051
1052 l2cap_chan_put(l2cap_pi(sk)->chan);
1053 sock_set_flag(sk, SOCK_DEAD);
1054 sock_put(sk);
1055}
1056
1057static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
1058{
1059 DECLARE_WAITQUEUE(wait, current);
1060 int err = 0;
1061 int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1062 /* Timeout to prevent infinite loop */
1063 unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
1064
1065 add_wait_queue(sk_sleep(sk), &wait);
1066 set_current_state(TASK_INTERRUPTIBLE);
1067 do {
1068 BT_DBG("Waiting for %d ACKs, timeout %04d ms",
1069 chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
1070 jiffies_to_msecs(timeout - jiffies));
1071
1072 if (!timeo)
1073 timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1074
1075 if (signal_pending(current)) {
1076 err = sock_intr_errno(timeo);
1077 break;
1078 }
1079
1080 release_sock(sk);
1081 timeo = schedule_timeout(timeo);
1082 lock_sock(sk);
1083 set_current_state(TASK_INTERRUPTIBLE);
1084
1085 err = sock_error(sk);
1086 if (err)
1087 break;
1088
1089 if (time_after(jiffies, timeout)) {
1090 err = -ENOLINK;
1091 break;
1092 }
1093
1094 } while (chan->unacked_frames > 0 &&
1095 chan->state == BT_CONNECTED);
1096
1097 set_current_state(TASK_RUNNING);
1098 remove_wait_queue(sk_sleep(sk), &wait);
1099 return err;
1100}
1101
1102static int l2cap_sock_shutdown(struct socket *sock, int how)
1103{
1104 struct sock *sk = sock->sk;
1105 struct l2cap_chan *chan;
1106 struct l2cap_conn *conn;
1107 int err = 0;
1108
1109 BT_DBG("sock %p, sk %p", sock, sk);
1110
1111 if (!sk)
1112 return 0;
1113
1114 lock_sock(sk);
1115
1116 if (sk->sk_shutdown)
1117 goto shutdown_already;
1118
1119 BT_DBG("Handling sock shutdown");
1120
1121 /* prevent sk structure from being freed whilst unlocked */
1122 sock_hold(sk);
1123
1124 chan = l2cap_pi(sk)->chan;
1125 /* prevent chan structure from being freed whilst unlocked */
1126 l2cap_chan_hold(chan);
1127
1128 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1129
1130 if (chan->mode == L2CAP_MODE_ERTM &&
1131 chan->unacked_frames > 0 &&
1132 chan->state == BT_CONNECTED) {
1133 err = __l2cap_wait_ack(sk, chan);
1134
1135 /* After waiting for ACKs, check whether shutdown
1136 * has already been actioned to close the L2CAP
1137 * link such as by l2cap_disconnection_req().
1138 */
1139 if (sk->sk_shutdown)
1140 goto has_shutdown;
1141 }
1142
1143 sk->sk_shutdown = SHUTDOWN_MASK;
1144 release_sock(sk);
1145
1146 l2cap_chan_lock(chan);
1147 conn = chan->conn;
1148 if (conn)
1149 /* prevent conn structure from being freed */
1150 l2cap_conn_get(conn);
1151 l2cap_chan_unlock(chan);
1152
1153 if (conn)
1154 /* mutex lock must be taken before l2cap_chan_lock() */
1155 mutex_lock(&conn->chan_lock);
1156
1157 l2cap_chan_lock(chan);
1158 l2cap_chan_close(chan, 0);
1159 l2cap_chan_unlock(chan);
1160
1161 if (conn) {
1162 mutex_unlock(&conn->chan_lock);
1163 l2cap_conn_put(conn);
1164 }
1165
1166 lock_sock(sk);
1167
1168 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1169 !(current->flags & PF_EXITING))
1170 err = bt_sock_wait_state(sk, BT_CLOSED,
1171 sk->sk_lingertime);
1172
1173has_shutdown:
1174 l2cap_chan_put(chan);
1175 sock_put(sk);
1176
1177shutdown_already:
1178 if (!err && sk->sk_err)
1179 err = -sk->sk_err;
1180
1181 release_sock(sk);
1182
1183 BT_DBG("Sock shutdown complete err: %d", err);
1184
1185 return err;
1186}
1187
1188static int l2cap_sock_release(struct socket *sock)
1189{
1190 struct sock *sk = sock->sk;
1191 int err;
1192
1193 BT_DBG("sock %p, sk %p", sock, sk);
1194
1195 if (!sk)
1196 return 0;
1197
1198 bt_sock_unlink(&l2cap_sk_list, sk);
1199
1200 err = l2cap_sock_shutdown(sock, 2);
1201
1202 sock_orphan(sk);
1203 l2cap_sock_kill(sk);
1204 return err;
1205}
1206
1207static void l2cap_sock_cleanup_listen(struct sock *parent)
1208{
1209 struct sock *sk;
1210
1211 BT_DBG("parent %p state %s", parent,
1212 state_to_string(parent->sk_state));
1213
1214 /* Close not yet accepted channels */
1215 while ((sk = bt_accept_dequeue(parent, NULL))) {
1216 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1217
1218 BT_DBG("child chan %p state %s", chan,
1219 state_to_string(chan->state));
1220
1221 l2cap_chan_lock(chan);
1222 __clear_chan_timer(chan);
1223 l2cap_chan_close(chan, ECONNRESET);
1224 l2cap_chan_unlock(chan);
1225
1226 l2cap_sock_kill(sk);
1227 }
1228}
1229
1230static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1231{
1232 struct sock *sk, *parent = chan->data;
1233
1234 lock_sock(parent);
1235
1236 /* Check for backlog size */
1237 if (sk_acceptq_is_full(parent)) {
1238 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1239 release_sock(parent);
1240 return NULL;
1241 }
1242
1243 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1244 GFP_ATOMIC, 0);
1245 if (!sk) {
1246 release_sock(parent);
1247 return NULL;
1248 }
1249
1250 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1251
1252 l2cap_sock_init(sk, parent);
1253
1254 bt_accept_enqueue(parent, sk);
1255
1256 release_sock(parent);
1257
1258 return l2cap_pi(sk)->chan;
1259}
1260
1261static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1262{
1263 struct sock *sk = chan->data;
1264 int err;
1265
1266 lock_sock(sk);
1267
1268 if (l2cap_pi(sk)->rx_busy_skb) {
1269 err = -ENOMEM;
1270 goto done;
1271 }
1272
1273 err = sock_queue_rcv_skb(sk, skb);
1274
1275 /* For ERTM, handle one skb that doesn't fit into the recv
1276 * buffer. This is important to do because the data frames
1277 * have already been acked, so the skb cannot be discarded.
1278 *
1279 * Notify the l2cap core that the buffer is full, so the
1280 * LOCAL_BUSY state is entered and no more frames are
1281 * acked and reassembled until there is buffer space
1282 * available.
1283 */
1284 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1285 l2cap_pi(sk)->rx_busy_skb = skb;
1286 l2cap_chan_busy(chan, 1);
1287 err = 0;
1288 }
1289
1290done:
1291 release_sock(sk);
1292
1293 return err;
1294}
1295
1296static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1297{
1298 struct sock *sk = chan->data;
1299
1300 l2cap_sock_kill(sk);
1301}
1302
1303static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1304{
1305 struct sock *sk = chan->data;
1306 struct sock *parent;
1307
1308 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1309
1310 /* This callback can be called both for server (BT_LISTEN)
1311 * sockets as well as "normal" ones. To avoid lockdep warnings
1312 * with child socket locking (through l2cap_sock_cleanup_listen)
1313 * we need separation into separate nesting levels. The simplest
1314 * way to accomplish this is to inherit the nesting level used
1315 * for the channel.
1316 */
1317 lock_sock_nested(sk, atomic_read(&chan->nesting));
1318
1319 parent = bt_sk(sk)->parent;
1320
1321 sock_set_flag(sk, SOCK_ZAPPED);
1322
1323 switch (chan->state) {
1324 case BT_OPEN:
1325 case BT_BOUND:
1326 case BT_CLOSED:
1327 break;
1328 case BT_LISTEN:
1329 l2cap_sock_cleanup_listen(sk);
1330 sk->sk_state = BT_CLOSED;
1331 chan->state = BT_CLOSED;
1332
1333 break;
1334 default:
1335 sk->sk_state = BT_CLOSED;
1336 chan->state = BT_CLOSED;
1337
1338 sk->sk_err = err;
1339
1340 if (parent) {
1341 bt_accept_unlink(sk);
1342 parent->sk_data_ready(parent);
1343 } else {
1344 sk->sk_state_change(sk);
1345 }
1346
1347 break;
1348 }
1349
1350 release_sock(sk);
1351}
1352
1353static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1354 int err)
1355{
1356 struct sock *sk = chan->data;
1357
1358 sk->sk_state = state;
1359
1360 if (err)
1361 sk->sk_err = err;
1362}
1363
1364static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1365 unsigned long hdr_len,
1366 unsigned long len, int nb)
1367{
1368 struct sock *sk = chan->data;
1369 struct sk_buff *skb;
1370 int err;
1371
1372 l2cap_chan_unlock(chan);
1373 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1374 l2cap_chan_lock(chan);
1375
1376 if (!skb)
1377 return ERR_PTR(err);
1378
1379 skb->priority = sk->sk_priority;
1380
1381 bt_cb(skb)->l2cap.chan = chan;
1382
1383 return skb;
1384}
1385
1386static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1387{
1388 struct sock *sk = chan->data;
1389 struct sock *parent;
1390
1391 lock_sock(sk);
1392
1393 parent = bt_sk(sk)->parent;
1394
1395 BT_DBG("sk %p, parent %p", sk, parent);
1396
1397 sk->sk_state = BT_CONNECTED;
1398 sk->sk_state_change(sk);
1399
1400 if (parent)
1401 parent->sk_data_ready(parent);
1402
1403 release_sock(sk);
1404}
1405
1406static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1407{
1408 struct sock *parent, *sk = chan->data;
1409
1410 lock_sock(sk);
1411
1412 parent = bt_sk(sk)->parent;
1413 if (parent)
1414 parent->sk_data_ready(parent);
1415
1416 release_sock(sk);
1417}
1418
1419static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1420{
1421 struct sock *sk = chan->data;
1422
1423 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1424 sk->sk_state = BT_CONNECTED;
1425 chan->state = BT_CONNECTED;
1426 }
1427
1428 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1429 sk->sk_state_change(sk);
1430}
1431
1432static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1433{
1434 struct sock *sk = chan->data;
1435
1436 lock_sock(sk);
1437 sk->sk_shutdown = SHUTDOWN_MASK;
1438 release_sock(sk);
1439}
1440
1441static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1442{
1443 struct sock *sk = chan->data;
1444
1445 return sk->sk_sndtimeo;
1446}
1447
1448static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1449{
1450 struct sock *sk = chan->data;
1451
1452 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1453 sk->sk_state_change(sk);
1454}
1455
1456static const struct l2cap_ops l2cap_chan_ops = {
1457 .name = "L2CAP Socket Interface",
1458 .new_connection = l2cap_sock_new_connection_cb,
1459 .recv = l2cap_sock_recv_cb,
1460 .close = l2cap_sock_close_cb,
1461 .teardown = l2cap_sock_teardown_cb,
1462 .state_change = l2cap_sock_state_change_cb,
1463 .ready = l2cap_sock_ready_cb,
1464 .defer = l2cap_sock_defer_cb,
1465 .resume = l2cap_sock_resume_cb,
1466 .suspend = l2cap_sock_suspend_cb,
1467 .set_shutdown = l2cap_sock_set_shutdown_cb,
1468 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1469 .alloc_skb = l2cap_sock_alloc_skb_cb,
1470};
1471
1472static void l2cap_sock_destruct(struct sock *sk)
1473{
1474 BT_DBG("sk %p", sk);
1475
1476 if (l2cap_pi(sk)->chan)
1477 l2cap_chan_put(l2cap_pi(sk)->chan);
1478
1479 if (l2cap_pi(sk)->rx_busy_skb) {
1480 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1481 l2cap_pi(sk)->rx_busy_skb = NULL;
1482 }
1483
1484 skb_queue_purge(&sk->sk_receive_queue);
1485 skb_queue_purge(&sk->sk_write_queue);
1486}
1487
1488static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1489 int *msg_namelen)
1490{
1491 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1492
1493 memset(la, 0, sizeof(struct sockaddr_l2));
1494 la->l2_family = AF_BLUETOOTH;
1495 la->l2_psm = bt_cb(skb)->l2cap.psm;
1496 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr);
1497
1498 *msg_namelen = sizeof(struct sockaddr_l2);
1499}
1500
1501static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1502{
1503 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1504
1505 BT_DBG("sk %p", sk);
1506
1507 if (parent) {
1508 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1509
1510 sk->sk_type = parent->sk_type;
1511 bt_sk(sk)->flags = bt_sk(parent)->flags;
1512
1513 chan->chan_type = pchan->chan_type;
1514 chan->imtu = pchan->imtu;
1515 chan->omtu = pchan->omtu;
1516 chan->conf_state = pchan->conf_state;
1517 chan->mode = pchan->mode;
1518 chan->fcs = pchan->fcs;
1519 chan->max_tx = pchan->max_tx;
1520 chan->tx_win = pchan->tx_win;
1521 chan->tx_win_max = pchan->tx_win_max;
1522 chan->sec_level = pchan->sec_level;
1523 chan->flags = pchan->flags;
1524 chan->tx_credits = pchan->tx_credits;
1525 chan->rx_credits = pchan->rx_credits;
1526
1527 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1528 chan->scid = pchan->scid;
1529 chan->dcid = pchan->scid;
1530 }
1531
1532 security_sk_clone(parent, sk);
1533 } else {
1534 switch (sk->sk_type) {
1535 case SOCK_RAW:
1536 chan->chan_type = L2CAP_CHAN_RAW;
1537 break;
1538 case SOCK_DGRAM:
1539 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1540 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1541 break;
1542 case SOCK_SEQPACKET:
1543 case SOCK_STREAM:
1544 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1545 break;
1546 }
1547
1548 chan->imtu = L2CAP_DEFAULT_MTU;
1549 chan->omtu = 0;
1550 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1551 chan->mode = L2CAP_MODE_ERTM;
1552 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1553 } else {
1554 chan->mode = L2CAP_MODE_BASIC;
1555 }
1556
1557 l2cap_chan_set_defaults(chan);
1558 }
1559
1560 /* Default config options */
1561 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1562
1563 chan->data = sk;
1564 chan->ops = &l2cap_chan_ops;
1565}
1566
1567static struct proto l2cap_proto = {
1568 .name = "L2CAP",
1569 .owner = THIS_MODULE,
1570 .obj_size = sizeof(struct l2cap_pinfo)
1571};
1572
1573static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1574 int proto, gfp_t prio, int kern)
1575{
1576 struct sock *sk;
1577 struct l2cap_chan *chan;
1578
1579 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, kern);
1580 if (!sk)
1581 return NULL;
1582
1583 sock_init_data(sock, sk);
1584 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1585
1586 sk->sk_destruct = l2cap_sock_destruct;
1587 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1588
1589 sock_reset_flag(sk, SOCK_ZAPPED);
1590
1591 sk->sk_protocol = proto;
1592 sk->sk_state = BT_OPEN;
1593
1594 chan = l2cap_chan_create();
1595 if (!chan) {
1596 sk_free(sk);
1597 return NULL;
1598 }
1599
1600 l2cap_chan_hold(chan);
1601
1602 l2cap_pi(sk)->chan = chan;
1603
1604 return sk;
1605}
1606
1607static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1608 int kern)
1609{
1610 struct sock *sk;
1611
1612 BT_DBG("sock %p", sock);
1613
1614 sock->state = SS_UNCONNECTED;
1615
1616 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1617 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1618 return -ESOCKTNOSUPPORT;
1619
1620 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1621 return -EPERM;
1622
1623 sock->ops = &l2cap_sock_ops;
1624
1625 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
1626 if (!sk)
1627 return -ENOMEM;
1628
1629 l2cap_sock_init(sk, NULL);
1630 bt_sock_link(&l2cap_sk_list, sk);
1631 return 0;
1632}
1633
1634static const struct proto_ops l2cap_sock_ops = {
1635 .family = PF_BLUETOOTH,
1636 .owner = THIS_MODULE,
1637 .release = l2cap_sock_release,
1638 .bind = l2cap_sock_bind,
1639 .connect = l2cap_sock_connect,
1640 .listen = l2cap_sock_listen,
1641 .accept = l2cap_sock_accept,
1642 .getname = l2cap_sock_getname,
1643 .sendmsg = l2cap_sock_sendmsg,
1644 .recvmsg = l2cap_sock_recvmsg,
1645 .poll = bt_sock_poll,
1646 .ioctl = bt_sock_ioctl,
1647 .mmap = sock_no_mmap,
1648 .socketpair = sock_no_socketpair,
1649 .shutdown = l2cap_sock_shutdown,
1650 .setsockopt = l2cap_sock_setsockopt,
1651 .getsockopt = l2cap_sock_getsockopt
1652};
1653
1654static const struct net_proto_family l2cap_sock_family_ops = {
1655 .family = PF_BLUETOOTH,
1656 .owner = THIS_MODULE,
1657 .create = l2cap_sock_create,
1658};
1659
1660int __init l2cap_init_sockets(void)
1661{
1662 int err;
1663
1664 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1665
1666 err = proto_register(&l2cap_proto, 0);
1667 if (err < 0)
1668 return err;
1669
1670 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1671 if (err < 0) {
1672 BT_ERR("L2CAP socket registration failed");
1673 goto error;
1674 }
1675
1676 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1677 NULL);
1678 if (err < 0) {
1679 BT_ERR("Failed to create L2CAP proc file");
1680 bt_sock_unregister(BTPROTO_L2CAP);
1681 goto error;
1682 }
1683
1684 BT_INFO("L2CAP socket layer initialized");
1685
1686 return 0;
1687
1688error:
1689 proto_unregister(&l2cap_proto);
1690 return err;
1691}
1692
1693void l2cap_cleanup_sockets(void)
1694{
1695 bt_procfs_cleanup(&init_net, "l2cap");
1696 bt_sock_unregister(BTPROTO_L2CAP);
1697 proto_unregister(&l2cap_proto);
1698}
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/security.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#include <net/bluetooth/smp.h>
37
38static const struct proto_ops l2cap_sock_ops;
39static void l2cap_sock_init(struct sock *sk, struct sock *parent);
40static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio);
41
42static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
43{
44 struct sock *sk = sock->sk;
45 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
46 struct sockaddr_l2 la;
47 int len, err = 0;
48
49 BT_DBG("sk %p", sk);
50
51 if (!addr || addr->sa_family != AF_BLUETOOTH)
52 return -EINVAL;
53
54 memset(&la, 0, sizeof(la));
55 len = min_t(unsigned int, sizeof(la), alen);
56 memcpy(&la, addr, len);
57
58 if (la.l2_cid && la.l2_psm)
59 return -EINVAL;
60
61 lock_sock(sk);
62
63 if (sk->sk_state != BT_OPEN) {
64 err = -EBADFD;
65 goto done;
66 }
67
68 if (la.l2_psm) {
69 __u16 psm = __le16_to_cpu(la.l2_psm);
70
71 /* PSM must be odd and lsb of upper byte must be 0 */
72 if ((psm & 0x0101) != 0x0001) {
73 err = -EINVAL;
74 goto done;
75 }
76
77 /* Restrict usage of well-known PSMs */
78 if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) {
79 err = -EACCES;
80 goto done;
81 }
82 }
83
84 if (la.l2_cid)
85 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
86 else
87 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
88
89 if (err < 0)
90 goto done;
91
92 if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
93 __le16_to_cpu(la.l2_psm) == 0x0003)
94 chan->sec_level = BT_SECURITY_SDP;
95
96 bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
97
98 chan->state = BT_BOUND;
99 sk->sk_state = BT_BOUND;
100
101done:
102 release_sock(sk);
103 return err;
104}
105
106static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
107{
108 struct sock *sk = sock->sk;
109 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
110 struct sockaddr_l2 la;
111 int len, err = 0;
112
113 BT_DBG("sk %p", sk);
114
115 if (!addr || alen < sizeof(addr->sa_family) ||
116 addr->sa_family != AF_BLUETOOTH)
117 return -EINVAL;
118
119 memset(&la, 0, sizeof(la));
120 len = min_t(unsigned int, sizeof(la), alen);
121 memcpy(&la, addr, len);
122
123 if (la.l2_cid && la.l2_psm)
124 return -EINVAL;
125
126 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
127 &la.l2_bdaddr, la.l2_bdaddr_type);
128 if (err)
129 return err;
130
131 lock_sock(sk);
132
133 err = bt_sock_wait_state(sk, BT_CONNECTED,
134 sock_sndtimeo(sk, flags & O_NONBLOCK));
135
136 release_sock(sk);
137
138 return err;
139}
140
141static int l2cap_sock_listen(struct socket *sock, int backlog)
142{
143 struct sock *sk = sock->sk;
144 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
145 int err = 0;
146
147 BT_DBG("sk %p backlog %d", sk, backlog);
148
149 lock_sock(sk);
150
151 if (sk->sk_state != BT_BOUND) {
152 err = -EBADFD;
153 goto done;
154 }
155
156 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
157 err = -EINVAL;
158 goto done;
159 }
160
161 switch (chan->mode) {
162 case L2CAP_MODE_BASIC:
163 break;
164 case L2CAP_MODE_ERTM:
165 case L2CAP_MODE_STREAMING:
166 if (!disable_ertm)
167 break;
168 /* fall through */
169 default:
170 err = -ENOTSUPP;
171 goto done;
172 }
173
174 sk->sk_max_ack_backlog = backlog;
175 sk->sk_ack_backlog = 0;
176
177 chan->state = BT_LISTEN;
178 sk->sk_state = BT_LISTEN;
179
180done:
181 release_sock(sk);
182 return err;
183}
184
185static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
186{
187 DECLARE_WAITQUEUE(wait, current);
188 struct sock *sk = sock->sk, *nsk;
189 long timeo;
190 int err = 0;
191
192 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
193
194 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
195
196 BT_DBG("sk %p timeo %ld", sk, timeo);
197
198 /* Wait for an incoming connection. (wake-one). */
199 add_wait_queue_exclusive(sk_sleep(sk), &wait);
200 while (1) {
201 set_current_state(TASK_INTERRUPTIBLE);
202
203 if (sk->sk_state != BT_LISTEN) {
204 err = -EBADFD;
205 break;
206 }
207
208 nsk = bt_accept_dequeue(sk, newsock);
209 if (nsk)
210 break;
211
212 if (!timeo) {
213 err = -EAGAIN;
214 break;
215 }
216
217 if (signal_pending(current)) {
218 err = sock_intr_errno(timeo);
219 break;
220 }
221
222 release_sock(sk);
223 timeo = schedule_timeout(timeo);
224 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
225 }
226 __set_current_state(TASK_RUNNING);
227 remove_wait_queue(sk_sleep(sk), &wait);
228
229 if (err)
230 goto done;
231
232 newsock->state = SS_CONNECTED;
233
234 BT_DBG("new socket %p", nsk);
235
236done:
237 release_sock(sk);
238 return err;
239}
240
241static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
242{
243 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
244 struct sock *sk = sock->sk;
245 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
246
247 BT_DBG("sock %p, sk %p", sock, sk);
248
249 memset(la, 0, sizeof(struct sockaddr_l2));
250 addr->sa_family = AF_BLUETOOTH;
251 *len = sizeof(struct sockaddr_l2);
252
253 if (peer) {
254 la->l2_psm = chan->psm;
255 bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
256 la->l2_cid = cpu_to_le16(chan->dcid);
257 } else {
258 la->l2_psm = chan->sport;
259 bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
260 la->l2_cid = cpu_to_le16(chan->scid);
261 }
262
263 return 0;
264}
265
266static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
267{
268 struct sock *sk = sock->sk;
269 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
270 struct l2cap_options opts;
271 struct l2cap_conninfo cinfo;
272 int len, err = 0;
273 u32 opt;
274
275 BT_DBG("sk %p", sk);
276
277 if (get_user(len, optlen))
278 return -EFAULT;
279
280 lock_sock(sk);
281
282 switch (optname) {
283 case L2CAP_OPTIONS:
284 memset(&opts, 0, sizeof(opts));
285 opts.imtu = chan->imtu;
286 opts.omtu = chan->omtu;
287 opts.flush_to = chan->flush_to;
288 opts.mode = chan->mode;
289 opts.fcs = chan->fcs;
290 opts.max_tx = chan->max_tx;
291 opts.txwin_size = chan->tx_win;
292
293 len = min_t(unsigned int, len, sizeof(opts));
294 if (copy_to_user(optval, (char *) &opts, len))
295 err = -EFAULT;
296
297 break;
298
299 case L2CAP_LM:
300 switch (chan->sec_level) {
301 case BT_SECURITY_LOW:
302 opt = L2CAP_LM_AUTH;
303 break;
304 case BT_SECURITY_MEDIUM:
305 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
306 break;
307 case BT_SECURITY_HIGH:
308 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
309 L2CAP_LM_SECURE;
310 break;
311 default:
312 opt = 0;
313 break;
314 }
315
316 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
317 opt |= L2CAP_LM_MASTER;
318
319 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
320 opt |= L2CAP_LM_RELIABLE;
321
322 if (put_user(opt, (u32 __user *) optval))
323 err = -EFAULT;
324 break;
325
326 case L2CAP_CONNINFO:
327 if (sk->sk_state != BT_CONNECTED &&
328 !(sk->sk_state == BT_CONNECT2 &&
329 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
330 err = -ENOTCONN;
331 break;
332 }
333
334 memset(&cinfo, 0, sizeof(cinfo));
335 cinfo.hci_handle = chan->conn->hcon->handle;
336 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
337
338 len = min_t(unsigned int, len, sizeof(cinfo));
339 if (copy_to_user(optval, (char *) &cinfo, len))
340 err = -EFAULT;
341
342 break;
343
344 default:
345 err = -ENOPROTOOPT;
346 break;
347 }
348
349 release_sock(sk);
350 return err;
351}
352
353static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
354{
355 struct sock *sk = sock->sk;
356 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
357 struct bt_security sec;
358 struct bt_power pwr;
359 int len, err = 0;
360
361 BT_DBG("sk %p", sk);
362
363 if (level == SOL_L2CAP)
364 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
365
366 if (level != SOL_BLUETOOTH)
367 return -ENOPROTOOPT;
368
369 if (get_user(len, optlen))
370 return -EFAULT;
371
372 lock_sock(sk);
373
374 switch (optname) {
375 case BT_SECURITY:
376 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
377 chan->chan_type != L2CAP_CHAN_RAW) {
378 err = -EINVAL;
379 break;
380 }
381
382 memset(&sec, 0, sizeof(sec));
383 if (chan->conn)
384 sec.level = chan->conn->hcon->sec_level;
385 else
386 sec.level = chan->sec_level;
387
388 if (sk->sk_state == BT_CONNECTED)
389 sec.key_size = chan->conn->hcon->enc_key_size;
390
391 len = min_t(unsigned int, len, sizeof(sec));
392 if (copy_to_user(optval, (char *) &sec, len))
393 err = -EFAULT;
394
395 break;
396
397 case BT_DEFER_SETUP:
398 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
399 err = -EINVAL;
400 break;
401 }
402
403 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
404 (u32 __user *) optval))
405 err = -EFAULT;
406
407 break;
408
409 case BT_FLUSHABLE:
410 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
411 (u32 __user *) optval))
412 err = -EFAULT;
413
414 break;
415
416 case BT_POWER:
417 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
418 && sk->sk_type != SOCK_RAW) {
419 err = -EINVAL;
420 break;
421 }
422
423 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
424
425 len = min_t(unsigned int, len, sizeof(pwr));
426 if (copy_to_user(optval, (char *) &pwr, len))
427 err = -EFAULT;
428
429 break;
430
431 case BT_CHANNEL_POLICY:
432 if (!enable_hs) {
433 err = -ENOPROTOOPT;
434 break;
435 }
436
437 if (put_user(chan->chan_policy, (u32 __user *) optval))
438 err = -EFAULT;
439 break;
440
441 default:
442 err = -ENOPROTOOPT;
443 break;
444 }
445
446 release_sock(sk);
447 return err;
448}
449
450static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
451{
452 struct sock *sk = sock->sk;
453 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
454 struct l2cap_options opts;
455 int len, err = 0;
456 u32 opt;
457
458 BT_DBG("sk %p", sk);
459
460 lock_sock(sk);
461
462 switch (optname) {
463 case L2CAP_OPTIONS:
464 if (sk->sk_state == BT_CONNECTED) {
465 err = -EINVAL;
466 break;
467 }
468
469 opts.imtu = chan->imtu;
470 opts.omtu = chan->omtu;
471 opts.flush_to = chan->flush_to;
472 opts.mode = chan->mode;
473 opts.fcs = chan->fcs;
474 opts.max_tx = chan->max_tx;
475 opts.txwin_size = chan->tx_win;
476
477 len = min_t(unsigned int, sizeof(opts), optlen);
478 if (copy_from_user((char *) &opts, optval, len)) {
479 err = -EFAULT;
480 break;
481 }
482
483 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
484 err = -EINVAL;
485 break;
486 }
487
488 chan->mode = opts.mode;
489 switch (chan->mode) {
490 case L2CAP_MODE_BASIC:
491 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
492 break;
493 case L2CAP_MODE_ERTM:
494 case L2CAP_MODE_STREAMING:
495 if (!disable_ertm)
496 break;
497 /* fall through */
498 default:
499 err = -EINVAL;
500 break;
501 }
502
503 chan->imtu = opts.imtu;
504 chan->omtu = opts.omtu;
505 chan->fcs = opts.fcs;
506 chan->max_tx = opts.max_tx;
507 chan->tx_win = opts.txwin_size;
508 break;
509
510 case L2CAP_LM:
511 if (get_user(opt, (u32 __user *) optval)) {
512 err = -EFAULT;
513 break;
514 }
515
516 if (opt & L2CAP_LM_AUTH)
517 chan->sec_level = BT_SECURITY_LOW;
518 if (opt & L2CAP_LM_ENCRYPT)
519 chan->sec_level = BT_SECURITY_MEDIUM;
520 if (opt & L2CAP_LM_SECURE)
521 chan->sec_level = BT_SECURITY_HIGH;
522
523 if (opt & L2CAP_LM_MASTER)
524 set_bit(FLAG_ROLE_SWITCH, &chan->flags);
525 else
526 clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
527
528 if (opt & L2CAP_LM_RELIABLE)
529 set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
530 else
531 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
532 break;
533
534 default:
535 err = -ENOPROTOOPT;
536 break;
537 }
538
539 release_sock(sk);
540 return err;
541}
542
543static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
544{
545 struct sock *sk = sock->sk;
546 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
547 struct bt_security sec;
548 struct bt_power pwr;
549 struct l2cap_conn *conn;
550 int len, err = 0;
551 u32 opt;
552
553 BT_DBG("sk %p", sk);
554
555 if (level == SOL_L2CAP)
556 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
557
558 if (level != SOL_BLUETOOTH)
559 return -ENOPROTOOPT;
560
561 lock_sock(sk);
562
563 switch (optname) {
564 case BT_SECURITY:
565 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
566 chan->chan_type != L2CAP_CHAN_RAW) {
567 err = -EINVAL;
568 break;
569 }
570
571 sec.level = BT_SECURITY_LOW;
572
573 len = min_t(unsigned int, sizeof(sec), optlen);
574 if (copy_from_user((char *) &sec, optval, len)) {
575 err = -EFAULT;
576 break;
577 }
578
579 if (sec.level < BT_SECURITY_LOW ||
580 sec.level > BT_SECURITY_HIGH) {
581 err = -EINVAL;
582 break;
583 }
584
585 chan->sec_level = sec.level;
586
587 if (!chan->conn)
588 break;
589
590 conn = chan->conn;
591
592 /*change security for LE channels */
593 if (chan->scid == L2CAP_CID_LE_DATA) {
594 if (!conn->hcon->out) {
595 err = -EINVAL;
596 break;
597 }
598
599 if (smp_conn_security(conn->hcon, sec.level))
600 break;
601 sk->sk_state = BT_CONFIG;
602 chan->state = BT_CONFIG;
603
604 /* or for ACL link */
605 } else if ((sk->sk_state == BT_CONNECT2 &&
606 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
607 sk->sk_state == BT_CONNECTED) {
608 if (!l2cap_chan_check_security(chan))
609 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
610 else
611 sk->sk_state_change(sk);
612 } else {
613 err = -EINVAL;
614 }
615 break;
616
617 case BT_DEFER_SETUP:
618 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
619 err = -EINVAL;
620 break;
621 }
622
623 if (get_user(opt, (u32 __user *) optval)) {
624 err = -EFAULT;
625 break;
626 }
627
628 if (opt)
629 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
630 else
631 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
632 break;
633
634 case BT_FLUSHABLE:
635 if (get_user(opt, (u32 __user *) optval)) {
636 err = -EFAULT;
637 break;
638 }
639
640 if (opt > BT_FLUSHABLE_ON) {
641 err = -EINVAL;
642 break;
643 }
644
645 if (opt == BT_FLUSHABLE_OFF) {
646 struct l2cap_conn *conn = chan->conn;
647 /* proceed further only when we have l2cap_conn and
648 No Flush support in the LM */
649 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
650 err = -EINVAL;
651 break;
652 }
653 }
654
655 if (opt)
656 set_bit(FLAG_FLUSHABLE, &chan->flags);
657 else
658 clear_bit(FLAG_FLUSHABLE, &chan->flags);
659 break;
660
661 case BT_POWER:
662 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
663 chan->chan_type != L2CAP_CHAN_RAW) {
664 err = -EINVAL;
665 break;
666 }
667
668 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
669
670 len = min_t(unsigned int, sizeof(pwr), optlen);
671 if (copy_from_user((char *) &pwr, optval, len)) {
672 err = -EFAULT;
673 break;
674 }
675
676 if (pwr.force_active)
677 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
678 else
679 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
680 break;
681
682 case BT_CHANNEL_POLICY:
683 if (!enable_hs) {
684 err = -ENOPROTOOPT;
685 break;
686 }
687
688 if (get_user(opt, (u32 __user *) optval)) {
689 err = -EFAULT;
690 break;
691 }
692
693 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
694 err = -EINVAL;
695 break;
696 }
697
698 if (chan->mode != L2CAP_MODE_ERTM &&
699 chan->mode != L2CAP_MODE_STREAMING) {
700 err = -EOPNOTSUPP;
701 break;
702 }
703
704 chan->chan_policy = (u8) opt;
705 break;
706
707 default:
708 err = -ENOPROTOOPT;
709 break;
710 }
711
712 release_sock(sk);
713 return err;
714}
715
716static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
717{
718 struct sock *sk = sock->sk;
719 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
720 int err;
721
722 BT_DBG("sock %p, sk %p", sock, sk);
723
724 err = sock_error(sk);
725 if (err)
726 return err;
727
728 if (msg->msg_flags & MSG_OOB)
729 return -EOPNOTSUPP;
730
731 if (sk->sk_state != BT_CONNECTED)
732 return -ENOTCONN;
733
734 l2cap_chan_lock(chan);
735 err = l2cap_chan_send(chan, msg, len, sk->sk_priority);
736 l2cap_chan_unlock(chan);
737
738 return err;
739}
740
741static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
742{
743 struct sock *sk = sock->sk;
744 struct l2cap_pinfo *pi = l2cap_pi(sk);
745 int err;
746
747 lock_sock(sk);
748
749 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
750 &bt_sk(sk)->flags)) {
751 sk->sk_state = BT_CONFIG;
752 pi->chan->state = BT_CONFIG;
753
754 __l2cap_connect_rsp_defer(pi->chan);
755 release_sock(sk);
756 return 0;
757 }
758
759 release_sock(sk);
760
761 if (sock->type == SOCK_STREAM)
762 err = bt_sock_stream_recvmsg(iocb, sock, msg, len, flags);
763 else
764 err = bt_sock_recvmsg(iocb, sock, msg, len, flags);
765
766 if (pi->chan->mode != L2CAP_MODE_ERTM)
767 return err;
768
769 /* Attempt to put pending rx data in the socket buffer */
770
771 lock_sock(sk);
772
773 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
774 goto done;
775
776 if (pi->rx_busy_skb) {
777 if (!sock_queue_rcv_skb(sk, pi->rx_busy_skb))
778 pi->rx_busy_skb = NULL;
779 else
780 goto done;
781 }
782
783 /* Restore data flow when half of the receive buffer is
784 * available. This avoids resending large numbers of
785 * frames.
786 */
787 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
788 l2cap_chan_busy(pi->chan, 0);
789
790done:
791 release_sock(sk);
792 return err;
793}
794
795/* Kill socket (only if zapped and orphan)
796 * Must be called on unlocked socket.
797 */
798static void l2cap_sock_kill(struct sock *sk)
799{
800 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
801 return;
802
803 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
804
805 /* Kill poor orphan */
806
807 l2cap_chan_destroy(l2cap_pi(sk)->chan);
808 sock_set_flag(sk, SOCK_DEAD);
809 sock_put(sk);
810}
811
812static int l2cap_sock_shutdown(struct socket *sock, int how)
813{
814 struct sock *sk = sock->sk;
815 struct l2cap_chan *chan;
816 struct l2cap_conn *conn;
817 int err = 0;
818
819 BT_DBG("sock %p, sk %p", sock, sk);
820
821 if (!sk)
822 return 0;
823
824 chan = l2cap_pi(sk)->chan;
825 conn = chan->conn;
826
827 if (conn)
828 mutex_lock(&conn->chan_lock);
829
830 l2cap_chan_lock(chan);
831 lock_sock(sk);
832
833 if (!sk->sk_shutdown) {
834 if (chan->mode == L2CAP_MODE_ERTM)
835 err = __l2cap_wait_ack(sk);
836
837 sk->sk_shutdown = SHUTDOWN_MASK;
838
839 release_sock(sk);
840 l2cap_chan_close(chan, 0);
841 lock_sock(sk);
842
843 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
844 err = bt_sock_wait_state(sk, BT_CLOSED,
845 sk->sk_lingertime);
846 }
847
848 if (!err && sk->sk_err)
849 err = -sk->sk_err;
850
851 release_sock(sk);
852 l2cap_chan_unlock(chan);
853
854 if (conn)
855 mutex_unlock(&conn->chan_lock);
856
857 return err;
858}
859
860static int l2cap_sock_release(struct socket *sock)
861{
862 struct sock *sk = sock->sk;
863 int err;
864
865 BT_DBG("sock %p, sk %p", sock, sk);
866
867 if (!sk)
868 return 0;
869
870 err = l2cap_sock_shutdown(sock, 2);
871
872 sock_orphan(sk);
873 l2cap_sock_kill(sk);
874 return err;
875}
876
877static struct l2cap_chan *l2cap_sock_new_connection_cb(void *data)
878{
879 struct sock *sk, *parent = data;
880
881 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
882 GFP_ATOMIC);
883 if (!sk)
884 return NULL;
885
886 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
887
888 l2cap_sock_init(sk, parent);
889
890 return l2cap_pi(sk)->chan;
891}
892
893static int l2cap_sock_recv_cb(void *data, struct sk_buff *skb)
894{
895 int err;
896 struct sock *sk = data;
897 struct l2cap_pinfo *pi = l2cap_pi(sk);
898
899 lock_sock(sk);
900
901 if (pi->rx_busy_skb) {
902 err = -ENOMEM;
903 goto done;
904 }
905
906 err = sock_queue_rcv_skb(sk, skb);
907
908 /* For ERTM, handle one skb that doesn't fit into the recv
909 * buffer. This is important to do because the data frames
910 * have already been acked, so the skb cannot be discarded.
911 *
912 * Notify the l2cap core that the buffer is full, so the
913 * LOCAL_BUSY state is entered and no more frames are
914 * acked and reassembled until there is buffer space
915 * available.
916 */
917 if (err < 0 && pi->chan->mode == L2CAP_MODE_ERTM) {
918 pi->rx_busy_skb = skb;
919 l2cap_chan_busy(pi->chan, 1);
920 err = 0;
921 }
922
923done:
924 release_sock(sk);
925
926 return err;
927}
928
929static void l2cap_sock_close_cb(void *data)
930{
931 struct sock *sk = data;
932
933 l2cap_sock_kill(sk);
934}
935
936static void l2cap_sock_state_change_cb(void *data, int state)
937{
938 struct sock *sk = data;
939
940 sk->sk_state = state;
941}
942
943static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
944 unsigned long len, int nb)
945{
946 struct sk_buff *skb;
947 int err;
948
949 l2cap_chan_unlock(chan);
950 skb = bt_skb_send_alloc(chan->sk, len, nb, &err);
951 l2cap_chan_lock(chan);
952
953 if (!skb)
954 return ERR_PTR(err);
955
956 return skb;
957}
958
959static struct l2cap_ops l2cap_chan_ops = {
960 .name = "L2CAP Socket Interface",
961 .new_connection = l2cap_sock_new_connection_cb,
962 .recv = l2cap_sock_recv_cb,
963 .close = l2cap_sock_close_cb,
964 .state_change = l2cap_sock_state_change_cb,
965 .alloc_skb = l2cap_sock_alloc_skb_cb,
966};
967
968static void l2cap_sock_destruct(struct sock *sk)
969{
970 BT_DBG("sk %p", sk);
971
972 l2cap_chan_put(l2cap_pi(sk)->chan);
973 if (l2cap_pi(sk)->rx_busy_skb) {
974 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
975 l2cap_pi(sk)->rx_busy_skb = NULL;
976 }
977
978 skb_queue_purge(&sk->sk_receive_queue);
979 skb_queue_purge(&sk->sk_write_queue);
980}
981
982static void l2cap_sock_init(struct sock *sk, struct sock *parent)
983{
984 struct l2cap_pinfo *pi = l2cap_pi(sk);
985 struct l2cap_chan *chan = pi->chan;
986
987 BT_DBG("sk %p", sk);
988
989 if (parent) {
990 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
991
992 sk->sk_type = parent->sk_type;
993 bt_sk(sk)->flags = bt_sk(parent)->flags;
994
995 chan->chan_type = pchan->chan_type;
996 chan->imtu = pchan->imtu;
997 chan->omtu = pchan->omtu;
998 chan->conf_state = pchan->conf_state;
999 chan->mode = pchan->mode;
1000 chan->fcs = pchan->fcs;
1001 chan->max_tx = pchan->max_tx;
1002 chan->tx_win = pchan->tx_win;
1003 chan->tx_win_max = pchan->tx_win_max;
1004 chan->sec_level = pchan->sec_level;
1005 chan->flags = pchan->flags;
1006
1007 security_sk_clone(parent, sk);
1008 } else {
1009
1010 switch (sk->sk_type) {
1011 case SOCK_RAW:
1012 chan->chan_type = L2CAP_CHAN_RAW;
1013 break;
1014 case SOCK_DGRAM:
1015 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1016 break;
1017 case SOCK_SEQPACKET:
1018 case SOCK_STREAM:
1019 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1020 break;
1021 }
1022
1023 chan->imtu = L2CAP_DEFAULT_MTU;
1024 chan->omtu = 0;
1025 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1026 chan->mode = L2CAP_MODE_ERTM;
1027 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1028 } else {
1029 chan->mode = L2CAP_MODE_BASIC;
1030 }
1031
1032 l2cap_chan_set_defaults(chan);
1033 }
1034
1035 /* Default config options */
1036 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1037
1038 chan->data = sk;
1039 chan->ops = &l2cap_chan_ops;
1040}
1041
1042static struct proto l2cap_proto = {
1043 .name = "L2CAP",
1044 .owner = THIS_MODULE,
1045 .obj_size = sizeof(struct l2cap_pinfo)
1046};
1047
1048static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
1049{
1050 struct sock *sk;
1051 struct l2cap_chan *chan;
1052
1053 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
1054 if (!sk)
1055 return NULL;
1056
1057 sock_init_data(sock, sk);
1058 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1059
1060 sk->sk_destruct = l2cap_sock_destruct;
1061 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1062
1063 sock_reset_flag(sk, SOCK_ZAPPED);
1064
1065 sk->sk_protocol = proto;
1066 sk->sk_state = BT_OPEN;
1067
1068 chan = l2cap_chan_create();
1069 if (!chan) {
1070 l2cap_sock_kill(sk);
1071 return NULL;
1072 }
1073
1074 l2cap_chan_hold(chan);
1075
1076 chan->sk = sk;
1077
1078 l2cap_pi(sk)->chan = chan;
1079
1080 return sk;
1081}
1082
1083static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1084 int kern)
1085{
1086 struct sock *sk;
1087
1088 BT_DBG("sock %p", sock);
1089
1090 sock->state = SS_UNCONNECTED;
1091
1092 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1093 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1094 return -ESOCKTNOSUPPORT;
1095
1096 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1097 return -EPERM;
1098
1099 sock->ops = &l2cap_sock_ops;
1100
1101 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
1102 if (!sk)
1103 return -ENOMEM;
1104
1105 l2cap_sock_init(sk, NULL);
1106 return 0;
1107}
1108
1109static const struct proto_ops l2cap_sock_ops = {
1110 .family = PF_BLUETOOTH,
1111 .owner = THIS_MODULE,
1112 .release = l2cap_sock_release,
1113 .bind = l2cap_sock_bind,
1114 .connect = l2cap_sock_connect,
1115 .listen = l2cap_sock_listen,
1116 .accept = l2cap_sock_accept,
1117 .getname = l2cap_sock_getname,
1118 .sendmsg = l2cap_sock_sendmsg,
1119 .recvmsg = l2cap_sock_recvmsg,
1120 .poll = bt_sock_poll,
1121 .ioctl = bt_sock_ioctl,
1122 .mmap = sock_no_mmap,
1123 .socketpair = sock_no_socketpair,
1124 .shutdown = l2cap_sock_shutdown,
1125 .setsockopt = l2cap_sock_setsockopt,
1126 .getsockopt = l2cap_sock_getsockopt
1127};
1128
1129static const struct net_proto_family l2cap_sock_family_ops = {
1130 .family = PF_BLUETOOTH,
1131 .owner = THIS_MODULE,
1132 .create = l2cap_sock_create,
1133};
1134
1135int __init l2cap_init_sockets(void)
1136{
1137 int err;
1138
1139 err = proto_register(&l2cap_proto, 0);
1140 if (err < 0)
1141 return err;
1142
1143 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1144 if (err < 0)
1145 goto error;
1146
1147 BT_INFO("L2CAP socket layer initialized");
1148
1149 return 0;
1150
1151error:
1152 BT_ERR("L2CAP socket registration failed");
1153 proto_unregister(&l2cap_proto);
1154 return err;
1155}
1156
1157void l2cap_cleanup_sockets(void)
1158{
1159 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
1160 BT_ERR("L2CAP socket unregistration failed");
1161
1162 proto_unregister(&l2cap_proto);
1163}