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