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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
7 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License version 2 as
11 published by the Free Software Foundation;
12
13 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
14 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
16 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
17 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
18 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21
22 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
23 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
24 SOFTWARE IS DISCLAIMED.
25*/
26
27/* Bluetooth L2CAP sockets. */
28
29#include <linux/security.h>
30
31#include <net/bluetooth/bluetooth.h>
32#include <net/bluetooth/hci_core.h>
33#include <net/bluetooth/l2cap.h>
34#include <net/bluetooth/smp.h>
35
36static const struct proto_ops l2cap_sock_ops;
37static void l2cap_sock_init(struct sock *sk, struct sock *parent);
38static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio);
39
40static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
41{
42 struct sock *sk = sock->sk;
43 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
44 struct sockaddr_l2 la;
45 int len, err = 0;
46
47 BT_DBG("sk %p", sk);
48
49 if (!addr || addr->sa_family != AF_BLUETOOTH)
50 return -EINVAL;
51
52 memset(&la, 0, sizeof(la));
53 len = min_t(unsigned int, sizeof(la), alen);
54 memcpy(&la, addr, len);
55
56 if (la.l2_cid && la.l2_psm)
57 return -EINVAL;
58
59 lock_sock(sk);
60
61 if (sk->sk_state != BT_OPEN) {
62 err = -EBADFD;
63 goto done;
64 }
65
66 if (la.l2_psm) {
67 __u16 psm = __le16_to_cpu(la.l2_psm);
68
69 /* PSM must be odd and lsb of upper byte must be 0 */
70 if ((psm & 0x0101) != 0x0001) {
71 err = -EINVAL;
72 goto done;
73 }
74
75 /* Restrict usage of well-known PSMs */
76 if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) {
77 err = -EACCES;
78 goto done;
79 }
80 }
81
82 if (la.l2_cid)
83 err = l2cap_add_scid(chan, la.l2_cid);
84 else
85 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
86
87 if (err < 0)
88 goto done;
89
90 if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
91 __le16_to_cpu(la.l2_psm) == 0x0003)
92 chan->sec_level = BT_SECURITY_SDP;
93
94 bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
95
96 chan->state = BT_BOUND;
97 sk->sk_state = BT_BOUND;
98
99done:
100 release_sock(sk);
101 return err;
102}
103
104static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
105{
106 struct sock *sk = sock->sk;
107 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
108 struct sockaddr_l2 la;
109 int len, err = 0;
110
111 BT_DBG("sk %p", sk);
112
113 if (!addr || alen < sizeof(addr->sa_family) ||
114 addr->sa_family != AF_BLUETOOTH)
115 return -EINVAL;
116
117 memset(&la, 0, sizeof(la));
118 len = min_t(unsigned int, sizeof(la), alen);
119 memcpy(&la, addr, len);
120
121 if (la.l2_cid && la.l2_psm)
122 return -EINVAL;
123
124 lock_sock(sk);
125
126 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED
127 && !(la.l2_psm || la.l2_cid)) {
128 err = -EINVAL;
129 goto done;
130 }
131
132 switch (chan->mode) {
133 case L2CAP_MODE_BASIC:
134 break;
135 case L2CAP_MODE_ERTM:
136 case L2CAP_MODE_STREAMING:
137 if (!disable_ertm)
138 break;
139 /* fall through */
140 default:
141 err = -ENOTSUPP;
142 goto done;
143 }
144
145 switch (sk->sk_state) {
146 case BT_CONNECT:
147 case BT_CONNECT2:
148 case BT_CONFIG:
149 /* Already connecting */
150 goto wait;
151
152 case BT_CONNECTED:
153 /* Already connected */
154 err = -EISCONN;
155 goto done;
156
157 case BT_OPEN:
158 case BT_BOUND:
159 /* Can connect */
160 break;
161
162 default:
163 err = -EBADFD;
164 goto done;
165 }
166
167 /* PSM must be odd and lsb of upper byte must be 0 */
168 if ((__le16_to_cpu(la.l2_psm) & 0x0101) != 0x0001 && !la.l2_cid &&
169 chan->chan_type != L2CAP_CHAN_RAW) {
170 err = -EINVAL;
171 goto done;
172 }
173
174 /* Set destination address and psm */
175 bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
176 chan->psm = la.l2_psm;
177 chan->dcid = la.l2_cid;
178
179 err = l2cap_chan_connect(l2cap_pi(sk)->chan);
180 if (err)
181 goto done;
182
183wait:
184 err = bt_sock_wait_state(sk, BT_CONNECTED,
185 sock_sndtimeo(sk, flags & O_NONBLOCK));
186done:
187 release_sock(sk);
188 return err;
189}
190
191static int l2cap_sock_listen(struct socket *sock, int backlog)
192{
193 struct sock *sk = sock->sk;
194 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
195 int err = 0;
196
197 BT_DBG("sk %p backlog %d", sk, backlog);
198
199 lock_sock(sk);
200
201 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
202 || sk->sk_state != BT_BOUND) {
203 err = -EBADFD;
204 goto done;
205 }
206
207 switch (chan->mode) {
208 case L2CAP_MODE_BASIC:
209 break;
210 case L2CAP_MODE_ERTM:
211 case L2CAP_MODE_STREAMING:
212 if (!disable_ertm)
213 break;
214 /* fall through */
215 default:
216 err = -ENOTSUPP;
217 goto done;
218 }
219
220 sk->sk_max_ack_backlog = backlog;
221 sk->sk_ack_backlog = 0;
222
223 chan->state = BT_LISTEN;
224 sk->sk_state = BT_LISTEN;
225
226done:
227 release_sock(sk);
228 return err;
229}
230
231static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
232{
233 DECLARE_WAITQUEUE(wait, current);
234 struct sock *sk = sock->sk, *nsk;
235 long timeo;
236 int err = 0;
237
238 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
239
240 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
241
242 BT_DBG("sk %p timeo %ld", sk, timeo);
243
244 /* Wait for an incoming connection. (wake-one). */
245 add_wait_queue_exclusive(sk_sleep(sk), &wait);
246 while (1) {
247 set_current_state(TASK_INTERRUPTIBLE);
248
249 if (sk->sk_state != BT_LISTEN) {
250 err = -EBADFD;
251 break;
252 }
253
254 nsk = bt_accept_dequeue(sk, newsock);
255 if (nsk)
256 break;
257
258 if (!timeo) {
259 err = -EAGAIN;
260 break;
261 }
262
263 if (signal_pending(current)) {
264 err = sock_intr_errno(timeo);
265 break;
266 }
267
268 release_sock(sk);
269 timeo = schedule_timeout(timeo);
270 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
271 }
272 __set_current_state(TASK_RUNNING);
273 remove_wait_queue(sk_sleep(sk), &wait);
274
275 if (err)
276 goto done;
277
278 newsock->state = SS_CONNECTED;
279
280 BT_DBG("new socket %p", nsk);
281
282done:
283 release_sock(sk);
284 return err;
285}
286
287static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
288{
289 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
290 struct sock *sk = sock->sk;
291 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
292
293 BT_DBG("sock %p, sk %p", sock, sk);
294
295 addr->sa_family = AF_BLUETOOTH;
296 *len = sizeof(struct sockaddr_l2);
297
298 if (peer) {
299 la->l2_psm = chan->psm;
300 bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
301 la->l2_cid = cpu_to_le16(chan->dcid);
302 } else {
303 la->l2_psm = chan->sport;
304 bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
305 la->l2_cid = cpu_to_le16(chan->scid);
306 }
307
308 return 0;
309}
310
311static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
312{
313 struct sock *sk = sock->sk;
314 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
315 struct l2cap_options opts;
316 struct l2cap_conninfo cinfo;
317 int len, err = 0;
318 u32 opt;
319
320 BT_DBG("sk %p", sk);
321
322 if (get_user(len, optlen))
323 return -EFAULT;
324
325 lock_sock(sk);
326
327 switch (optname) {
328 case L2CAP_OPTIONS:
329 memset(&opts, 0, sizeof(opts));
330 opts.imtu = chan->imtu;
331 opts.omtu = chan->omtu;
332 opts.flush_to = chan->flush_to;
333 opts.mode = chan->mode;
334 opts.fcs = chan->fcs;
335 opts.max_tx = chan->max_tx;
336 opts.txwin_size = (__u16)chan->tx_win;
337
338 len = min_t(unsigned int, len, sizeof(opts));
339 if (copy_to_user(optval, (char *) &opts, len))
340 err = -EFAULT;
341
342 break;
343
344 case L2CAP_LM:
345 switch (chan->sec_level) {
346 case BT_SECURITY_LOW:
347 opt = L2CAP_LM_AUTH;
348 break;
349 case BT_SECURITY_MEDIUM:
350 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
351 break;
352 case BT_SECURITY_HIGH:
353 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
354 L2CAP_LM_SECURE;
355 break;
356 default:
357 opt = 0;
358 break;
359 }
360
361 if (chan->role_switch)
362 opt |= L2CAP_LM_MASTER;
363
364 if (chan->force_reliable)
365 opt |= L2CAP_LM_RELIABLE;
366
367 if (put_user(opt, (u32 __user *) optval))
368 err = -EFAULT;
369 break;
370
371 case L2CAP_CONNINFO:
372 if (sk->sk_state != BT_CONNECTED &&
373 !(sk->sk_state == BT_CONNECT2 &&
374 bt_sk(sk)->defer_setup)) {
375 err = -ENOTCONN;
376 break;
377 }
378
379 memset(&cinfo, 0, sizeof(cinfo));
380 cinfo.hci_handle = chan->conn->hcon->handle;
381 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
382
383 len = min_t(unsigned int, len, sizeof(cinfo));
384 if (copy_to_user(optval, (char *) &cinfo, len))
385 err = -EFAULT;
386
387 break;
388
389 default:
390 err = -ENOPROTOOPT;
391 break;
392 }
393
394 release_sock(sk);
395 return err;
396}
397
398static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
399{
400 struct sock *sk = sock->sk;
401 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
402 struct bt_security sec;
403 struct bt_power pwr;
404 int len, err = 0;
405
406 BT_DBG("sk %p", sk);
407
408 if (level == SOL_L2CAP)
409 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
410
411 if (level != SOL_BLUETOOTH)
412 return -ENOPROTOOPT;
413
414 if (get_user(len, optlen))
415 return -EFAULT;
416
417 lock_sock(sk);
418
419 switch (optname) {
420 case BT_SECURITY:
421 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
422 chan->chan_type != L2CAP_CHAN_RAW) {
423 err = -EINVAL;
424 break;
425 }
426
427 memset(&sec, 0, sizeof(sec));
428 sec.level = chan->sec_level;
429
430 if (sk->sk_state == BT_CONNECTED)
431 sec.key_size = chan->conn->hcon->enc_key_size;
432
433 len = min_t(unsigned int, len, sizeof(sec));
434 if (copy_to_user(optval, (char *) &sec, len))
435 err = -EFAULT;
436
437 break;
438
439 case BT_DEFER_SETUP:
440 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
441 err = -EINVAL;
442 break;
443 }
444
445 if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
446 err = -EFAULT;
447
448 break;
449
450 case BT_FLUSHABLE:
451 if (put_user(chan->flushable, (u32 __user *) optval))
452 err = -EFAULT;
453
454 break;
455
456 case BT_POWER:
457 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
458 && sk->sk_type != SOCK_RAW) {
459 err = -EINVAL;
460 break;
461 }
462
463 pwr.force_active = chan->force_active;
464
465 len = min_t(unsigned int, len, sizeof(pwr));
466 if (copy_to_user(optval, (char *) &pwr, len))
467 err = -EFAULT;
468
469 break;
470
471 default:
472 err = -ENOPROTOOPT;
473 break;
474 }
475
476 release_sock(sk);
477 return err;
478}
479
480static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
481{
482 struct sock *sk = sock->sk;
483 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
484 struct l2cap_options opts;
485 int len, err = 0;
486 u32 opt;
487
488 BT_DBG("sk %p", sk);
489
490 lock_sock(sk);
491
492 switch (optname) {
493 case L2CAP_OPTIONS:
494 if (sk->sk_state == BT_CONNECTED) {
495 err = -EINVAL;
496 break;
497 }
498
499 opts.imtu = chan->imtu;
500 opts.omtu = chan->omtu;
501 opts.flush_to = chan->flush_to;
502 opts.mode = chan->mode;
503 opts.fcs = chan->fcs;
504 opts.max_tx = chan->max_tx;
505 opts.txwin_size = (__u16)chan->tx_win;
506
507 len = min_t(unsigned int, sizeof(opts), optlen);
508 if (copy_from_user((char *) &opts, optval, len)) {
509 err = -EFAULT;
510 break;
511 }
512
513 if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) {
514 err = -EINVAL;
515 break;
516 }
517
518 chan->mode = opts.mode;
519 switch (chan->mode) {
520 case L2CAP_MODE_BASIC:
521 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
522 break;
523 case L2CAP_MODE_ERTM:
524 case L2CAP_MODE_STREAMING:
525 if (!disable_ertm)
526 break;
527 /* fall through */
528 default:
529 err = -EINVAL;
530 break;
531 }
532
533 chan->imtu = opts.imtu;
534 chan->omtu = opts.omtu;
535 chan->fcs = opts.fcs;
536 chan->max_tx = opts.max_tx;
537 chan->tx_win = (__u8)opts.txwin_size;
538 break;
539
540 case L2CAP_LM:
541 if (get_user(opt, (u32 __user *) optval)) {
542 err = -EFAULT;
543 break;
544 }
545
546 if (opt & L2CAP_LM_AUTH)
547 chan->sec_level = BT_SECURITY_LOW;
548 if (opt & L2CAP_LM_ENCRYPT)
549 chan->sec_level = BT_SECURITY_MEDIUM;
550 if (opt & L2CAP_LM_SECURE)
551 chan->sec_level = BT_SECURITY_HIGH;
552
553 chan->role_switch = (opt & L2CAP_LM_MASTER);
554 chan->force_reliable = (opt & L2CAP_LM_RELIABLE);
555 break;
556
557 default:
558 err = -ENOPROTOOPT;
559 break;
560 }
561
562 release_sock(sk);
563 return err;
564}
565
566static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
567{
568 struct sock *sk = sock->sk;
569 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
570 struct bt_security sec;
571 struct bt_power pwr;
572 struct l2cap_conn *conn;
573 int len, err = 0;
574 u32 opt;
575
576 BT_DBG("sk %p", sk);
577
578 if (level == SOL_L2CAP)
579 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
580
581 if (level != SOL_BLUETOOTH)
582 return -ENOPROTOOPT;
583
584 lock_sock(sk);
585
586 switch (optname) {
587 case BT_SECURITY:
588 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
589 chan->chan_type != L2CAP_CHAN_RAW) {
590 err = -EINVAL;
591 break;
592 }
593
594 sec.level = BT_SECURITY_LOW;
595
596 len = min_t(unsigned int, sizeof(sec), optlen);
597 if (copy_from_user((char *) &sec, optval, len)) {
598 err = -EFAULT;
599 break;
600 }
601
602 if (sec.level < BT_SECURITY_LOW ||
603 sec.level > BT_SECURITY_HIGH) {
604 err = -EINVAL;
605 break;
606 }
607
608 chan->sec_level = sec.level;
609
610 conn = chan->conn;
611 if (conn && chan->scid == L2CAP_CID_LE_DATA) {
612 if (!conn->hcon->out) {
613 err = -EINVAL;
614 break;
615 }
616
617 if (smp_conn_security(conn, sec.level))
618 break;
619
620 err = 0;
621 sk->sk_state = BT_CONFIG;
622 }
623 break;
624
625 case BT_DEFER_SETUP:
626 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
627 err = -EINVAL;
628 break;
629 }
630
631 if (get_user(opt, (u32 __user *) optval)) {
632 err = -EFAULT;
633 break;
634 }
635
636 bt_sk(sk)->defer_setup = opt;
637 break;
638
639 case BT_FLUSHABLE:
640 if (get_user(opt, (u32 __user *) optval)) {
641 err = -EFAULT;
642 break;
643 }
644
645 if (opt > BT_FLUSHABLE_ON) {
646 err = -EINVAL;
647 break;
648 }
649
650 if (opt == BT_FLUSHABLE_OFF) {
651 struct l2cap_conn *conn = chan->conn;
652 /* proceed further only when we have l2cap_conn and
653 No Flush support in the LM */
654 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
655 err = -EINVAL;
656 break;
657 }
658 }
659
660 chan->flushable = opt;
661 break;
662
663 case BT_POWER:
664 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
665 chan->chan_type != L2CAP_CHAN_RAW) {
666 err = -EINVAL;
667 break;
668 }
669
670 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
671
672 len = min_t(unsigned int, sizeof(pwr), optlen);
673 if (copy_from_user((char *) &pwr, optval, len)) {
674 err = -EFAULT;
675 break;
676 }
677 chan->force_active = pwr.force_active;
678 break;
679
680 default:
681 err = -ENOPROTOOPT;
682 break;
683 }
684
685 release_sock(sk);
686 return err;
687}
688
689static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
690{
691 struct sock *sk = sock->sk;
692 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
693 int err;
694
695 BT_DBG("sock %p, sk %p", sock, sk);
696
697 err = sock_error(sk);
698 if (err)
699 return err;
700
701 if (msg->msg_flags & MSG_OOB)
702 return -EOPNOTSUPP;
703
704 lock_sock(sk);
705
706 if (sk->sk_state != BT_CONNECTED) {
707 release_sock(sk);
708 return -ENOTCONN;
709 }
710
711 err = l2cap_chan_send(chan, msg, len);
712
713 release_sock(sk);
714 return err;
715}
716
717static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
718{
719 struct sock *sk = sock->sk;
720 struct l2cap_pinfo *pi = l2cap_pi(sk);
721 int err;
722
723 lock_sock(sk);
724
725 if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
726 sk->sk_state = BT_CONFIG;
727
728 __l2cap_connect_rsp_defer(pi->chan);
729 release_sock(sk);
730 return 0;
731 }
732
733 release_sock(sk);
734
735 if (sock->type == SOCK_STREAM)
736 err = bt_sock_stream_recvmsg(iocb, sock, msg, len, flags);
737 else
738 err = bt_sock_recvmsg(iocb, sock, msg, len, flags);
739
740 if (pi->chan->mode != L2CAP_MODE_ERTM)
741 return err;
742
743 /* Attempt to put pending rx data in the socket buffer */
744
745 lock_sock(sk);
746
747 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
748 goto done;
749
750 if (pi->rx_busy_skb) {
751 if (!sock_queue_rcv_skb(sk, pi->rx_busy_skb))
752 pi->rx_busy_skb = NULL;
753 else
754 goto done;
755 }
756
757 /* Restore data flow when half of the receive buffer is
758 * available. This avoids resending large numbers of
759 * frames.
760 */
761 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
762 l2cap_chan_busy(pi->chan, 0);
763
764done:
765 release_sock(sk);
766 return err;
767}
768
769/* Kill socket (only if zapped and orphan)
770 * Must be called on unlocked socket.
771 */
772static void l2cap_sock_kill(struct sock *sk)
773{
774 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
775 return;
776
777 BT_DBG("sk %p state %d", sk, sk->sk_state);
778
779 /* Kill poor orphan */
780
781 l2cap_chan_destroy(l2cap_pi(sk)->chan);
782 sock_set_flag(sk, SOCK_DEAD);
783 sock_put(sk);
784}
785
786static int l2cap_sock_shutdown(struct socket *sock, int how)
787{
788 struct sock *sk = sock->sk;
789 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
790 int err = 0;
791
792 BT_DBG("sock %p, sk %p", sock, sk);
793
794 if (!sk)
795 return 0;
796
797 lock_sock(sk);
798 if (!sk->sk_shutdown) {
799 if (chan->mode == L2CAP_MODE_ERTM)
800 err = __l2cap_wait_ack(sk);
801
802 sk->sk_shutdown = SHUTDOWN_MASK;
803 l2cap_chan_close(chan, 0);
804
805 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
806 err = bt_sock_wait_state(sk, BT_CLOSED,
807 sk->sk_lingertime);
808 }
809
810 if (!err && sk->sk_err)
811 err = -sk->sk_err;
812
813 release_sock(sk);
814 return err;
815}
816
817static int l2cap_sock_release(struct socket *sock)
818{
819 struct sock *sk = sock->sk;
820 int err;
821
822 BT_DBG("sock %p, sk %p", sock, sk);
823
824 if (!sk)
825 return 0;
826
827 err = l2cap_sock_shutdown(sock, 2);
828
829 sock_orphan(sk);
830 l2cap_sock_kill(sk);
831 return err;
832}
833
834static struct l2cap_chan *l2cap_sock_new_connection_cb(void *data)
835{
836 struct sock *sk, *parent = data;
837
838 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
839 GFP_ATOMIC);
840 if (!sk)
841 return NULL;
842
843 l2cap_sock_init(sk, parent);
844
845 return l2cap_pi(sk)->chan;
846}
847
848static int l2cap_sock_recv_cb(void *data, struct sk_buff *skb)
849{
850 int err;
851 struct sock *sk = data;
852 struct l2cap_pinfo *pi = l2cap_pi(sk);
853
854 if (pi->rx_busy_skb)
855 return -ENOMEM;
856
857 err = sock_queue_rcv_skb(sk, skb);
858
859 /* For ERTM, handle one skb that doesn't fit into the recv
860 * buffer. This is important to do because the data frames
861 * have already been acked, so the skb cannot be discarded.
862 *
863 * Notify the l2cap core that the buffer is full, so the
864 * LOCAL_BUSY state is entered and no more frames are
865 * acked and reassembled until there is buffer space
866 * available.
867 */
868 if (err < 0 && pi->chan->mode == L2CAP_MODE_ERTM) {
869 pi->rx_busy_skb = skb;
870 l2cap_chan_busy(pi->chan, 1);
871 err = 0;
872 }
873
874 return err;
875}
876
877static void l2cap_sock_close_cb(void *data)
878{
879 struct sock *sk = data;
880
881 l2cap_sock_kill(sk);
882}
883
884static void l2cap_sock_state_change_cb(void *data, int state)
885{
886 struct sock *sk = data;
887
888 sk->sk_state = state;
889}
890
891static struct l2cap_ops l2cap_chan_ops = {
892 .name = "L2CAP Socket Interface",
893 .new_connection = l2cap_sock_new_connection_cb,
894 .recv = l2cap_sock_recv_cb,
895 .close = l2cap_sock_close_cb,
896 .state_change = l2cap_sock_state_change_cb,
897};
898
899static void l2cap_sock_destruct(struct sock *sk)
900{
901 BT_DBG("sk %p", sk);
902
903 if (l2cap_pi(sk)->rx_busy_skb) {
904 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
905 l2cap_pi(sk)->rx_busy_skb = NULL;
906 }
907
908 skb_queue_purge(&sk->sk_receive_queue);
909 skb_queue_purge(&sk->sk_write_queue);
910}
911
912static void l2cap_sock_init(struct sock *sk, struct sock *parent)
913{
914 struct l2cap_pinfo *pi = l2cap_pi(sk);
915 struct l2cap_chan *chan = pi->chan;
916
917 BT_DBG("sk %p", sk);
918
919 if (parent) {
920 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
921
922 sk->sk_type = parent->sk_type;
923 bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
924
925 chan->chan_type = pchan->chan_type;
926 chan->imtu = pchan->imtu;
927 chan->omtu = pchan->omtu;
928 chan->conf_state = pchan->conf_state;
929 chan->mode = pchan->mode;
930 chan->fcs = pchan->fcs;
931 chan->max_tx = pchan->max_tx;
932 chan->tx_win = pchan->tx_win;
933 chan->sec_level = pchan->sec_level;
934 chan->role_switch = pchan->role_switch;
935 chan->force_reliable = pchan->force_reliable;
936 chan->flushable = pchan->flushable;
937 chan->force_active = pchan->force_active;
938
939 security_sk_clone(parent, sk);
940 } else {
941
942 switch (sk->sk_type) {
943 case SOCK_RAW:
944 chan->chan_type = L2CAP_CHAN_RAW;
945 break;
946 case SOCK_DGRAM:
947 chan->chan_type = L2CAP_CHAN_CONN_LESS;
948 break;
949 case SOCK_SEQPACKET:
950 case SOCK_STREAM:
951 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
952 break;
953 }
954
955 chan->imtu = L2CAP_DEFAULT_MTU;
956 chan->omtu = 0;
957 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
958 chan->mode = L2CAP_MODE_ERTM;
959 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
960 } else {
961 chan->mode = L2CAP_MODE_BASIC;
962 }
963 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
964 chan->fcs = L2CAP_FCS_CRC16;
965 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
966 chan->sec_level = BT_SECURITY_LOW;
967 chan->role_switch = 0;
968 chan->force_reliable = 0;
969 chan->flushable = BT_FLUSHABLE_OFF;
970 chan->force_active = BT_POWER_FORCE_ACTIVE_ON;
971
972 }
973
974 /* Default config options */
975 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
976
977 chan->data = sk;
978 chan->ops = &l2cap_chan_ops;
979}
980
981static struct proto l2cap_proto = {
982 .name = "L2CAP",
983 .owner = THIS_MODULE,
984 .obj_size = sizeof(struct l2cap_pinfo)
985};
986
987static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
988{
989 struct sock *sk;
990 struct l2cap_chan *chan;
991
992 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
993 if (!sk)
994 return NULL;
995
996 sock_init_data(sock, sk);
997 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
998
999 sk->sk_destruct = l2cap_sock_destruct;
1000 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1001
1002 sock_reset_flag(sk, SOCK_ZAPPED);
1003
1004 sk->sk_protocol = proto;
1005 sk->sk_state = BT_OPEN;
1006
1007 chan = l2cap_chan_create(sk);
1008 if (!chan) {
1009 l2cap_sock_kill(sk);
1010 return NULL;
1011 }
1012
1013 l2cap_pi(sk)->chan = chan;
1014
1015 return sk;
1016}
1017
1018static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1019 int kern)
1020{
1021 struct sock *sk;
1022
1023 BT_DBG("sock %p", sock);
1024
1025 sock->state = SS_UNCONNECTED;
1026
1027 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1028 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1029 return -ESOCKTNOSUPPORT;
1030
1031 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1032 return -EPERM;
1033
1034 sock->ops = &l2cap_sock_ops;
1035
1036 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
1037 if (!sk)
1038 return -ENOMEM;
1039
1040 l2cap_sock_init(sk, NULL);
1041 return 0;
1042}
1043
1044static const struct proto_ops l2cap_sock_ops = {
1045 .family = PF_BLUETOOTH,
1046 .owner = THIS_MODULE,
1047 .release = l2cap_sock_release,
1048 .bind = l2cap_sock_bind,
1049 .connect = l2cap_sock_connect,
1050 .listen = l2cap_sock_listen,
1051 .accept = l2cap_sock_accept,
1052 .getname = l2cap_sock_getname,
1053 .sendmsg = l2cap_sock_sendmsg,
1054 .recvmsg = l2cap_sock_recvmsg,
1055 .poll = bt_sock_poll,
1056 .ioctl = bt_sock_ioctl,
1057 .mmap = sock_no_mmap,
1058 .socketpair = sock_no_socketpair,
1059 .shutdown = l2cap_sock_shutdown,
1060 .setsockopt = l2cap_sock_setsockopt,
1061 .getsockopt = l2cap_sock_getsockopt
1062};
1063
1064static const struct net_proto_family l2cap_sock_family_ops = {
1065 .family = PF_BLUETOOTH,
1066 .owner = THIS_MODULE,
1067 .create = l2cap_sock_create,
1068};
1069
1070int __init l2cap_init_sockets(void)
1071{
1072 int err;
1073
1074 err = proto_register(&l2cap_proto, 0);
1075 if (err < 0)
1076 return err;
1077
1078 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1079 if (err < 0)
1080 goto error;
1081
1082 BT_INFO("L2CAP socket layer initialized");
1083
1084 return 0;
1085
1086error:
1087 BT_ERR("L2CAP socket registration failed");
1088 proto_unregister(&l2cap_proto);
1089 return err;
1090}
1091
1092void l2cap_cleanup_sockets(void)
1093{
1094 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
1095 BT_ERR("L2CAP socket unregistration failed");
1096
1097 proto_unregister(&l2cap_proto);
1098}