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Merge remote-tracking branches 'asoc/topic/sgtl5000', 'asoc/topic/simple', 'asoc...
[mirror_ubuntu-bionic-kernel.git] / net / bluetooth / l2cap_sock.c
1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5 Copyright (C) 2010 Google Inc.
6 Copyright (C) 2011 ProFUSION Embedded Systems
7
8 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License version 2 as
12 published by the Free Software Foundation;
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
17 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
18 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22
23 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
25 SOFTWARE IS DISCLAIMED.
26 */
27
28 /* Bluetooth L2CAP sockets. */
29
30 #include <linux/module.h>
31 #include <linux/export.h>
32
33 #include <net/bluetooth/bluetooth.h>
34 #include <net/bluetooth/hci_core.h>
35 #include <net/bluetooth/l2cap.h>
36
37 #include "smp.h"
38
39 static struct bt_sock_list l2cap_sk_list = {
40 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
41 };
42
43 static const struct proto_ops l2cap_sock_ops;
44 static void l2cap_sock_init(struct sock *sk, struct sock *parent);
45 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
46 int proto, gfp_t prio, int kern);
47
48 bool l2cap_is_socket(struct socket *sock)
49 {
50 return sock && sock->ops == &l2cap_sock_ops;
51 }
52 EXPORT_SYMBOL(l2cap_is_socket);
53
54 static int l2cap_validate_bredr_psm(u16 psm)
55 {
56 /* PSM must be odd and lsb of upper byte must be 0 */
57 if ((psm & 0x0101) != 0x0001)
58 return -EINVAL;
59
60 /* Restrict usage of well-known PSMs */
61 if (psm < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE))
62 return -EACCES;
63
64 return 0;
65 }
66
67 static int l2cap_validate_le_psm(u16 psm)
68 {
69 /* Valid LE_PSM ranges are defined only until 0x00ff */
70 if (psm > 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
80 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
81 {
82 struct sock *sk = sock->sk;
83 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
84 struct sockaddr_l2 la;
85 int len, err = 0;
86
87 BT_DBG("sk %p", sk);
88
89 if (!addr || addr->sa_family != AF_BLUETOOTH)
90 return -EINVAL;
91
92 memset(&la, 0, sizeof(la));
93 len = min_t(unsigned int, sizeof(la), alen);
94 memcpy(&la, addr, len);
95
96 if (la.l2_cid && la.l2_psm)
97 return -EINVAL;
98
99 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
100 return -EINVAL;
101
102 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
103 /* We only allow ATT user space socket */
104 if (la.l2_cid &&
105 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
106 return -EINVAL;
107 }
108
109 lock_sock(sk);
110
111 if (sk->sk_state != BT_OPEN) {
112 err = -EBADFD;
113 goto done;
114 }
115
116 if (la.l2_psm) {
117 __u16 psm = __le16_to_cpu(la.l2_psm);
118
119 if (la.l2_bdaddr_type == BDADDR_BREDR)
120 err = l2cap_validate_bredr_psm(psm);
121 else
122 err = l2cap_validate_le_psm(psm);
123
124 if (err)
125 goto done;
126 }
127
128 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
168 done:
169 release_sock(sk);
170 return err;
171 }
172
173 static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
174 int alen, int flags)
175 {
176 struct sock *sk = sock->sk;
177 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
178 struct sockaddr_l2 la;
179 int len, err = 0;
180
181 BT_DBG("sk %p", sk);
182
183 if (!addr || alen < sizeof(addr->sa_family) ||
184 addr->sa_family != AF_BLUETOOTH)
185 return -EINVAL;
186
187 memset(&la, 0, sizeof(la));
188 len = min_t(unsigned int, sizeof(la), alen);
189 memcpy(&la, addr, len);
190
191 if (la.l2_cid && la.l2_psm)
192 return -EINVAL;
193
194 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
195 return -EINVAL;
196
197 /* Check that the socket wasn't bound to something that
198 * conflicts with the address given to connect(). If chan->src
199 * is BDADDR_ANY it means bind() was never used, in which case
200 * chan->src_type and la.l2_bdaddr_type do not need to match.
201 */
202 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
203 bdaddr_type_is_le(la.l2_bdaddr_type)) {
204 /* Old user space versions will try to incorrectly bind
205 * the ATT socket using BDADDR_BREDR. We need to accept
206 * this and fix up the source address type only when
207 * both the source CID and destination CID indicate
208 * ATT. Anything else is an invalid combination.
209 */
210 if (chan->scid != L2CAP_CID_ATT ||
211 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
212 return -EINVAL;
213
214 /* We don't have the hdev available here to make a
215 * better decision on random vs public, but since all
216 * user space versions that exhibit this issue anyway do
217 * not support random local addresses assuming public
218 * here is good enough.
219 */
220 chan->src_type = BDADDR_LE_PUBLIC;
221 }
222
223 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
224 return -EINVAL;
225
226 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
227 /* We only allow ATT user space socket */
228 if (la.l2_cid &&
229 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
230 return -EINVAL;
231 }
232
233 if (chan->psm && bdaddr_type_is_le(chan->src_type))
234 chan->mode = L2CAP_MODE_LE_FLOWCTL;
235
236 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
237 &la.l2_bdaddr, la.l2_bdaddr_type);
238 if (err)
239 return err;
240
241 lock_sock(sk);
242
243 err = bt_sock_wait_state(sk, BT_CONNECTED,
244 sock_sndtimeo(sk, flags & O_NONBLOCK));
245
246 release_sock(sk);
247
248 return err;
249 }
250
251 static int l2cap_sock_listen(struct socket *sock, int backlog)
252 {
253 struct sock *sk = sock->sk;
254 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
255 int err = 0;
256
257 BT_DBG("sk %p backlog %d", sk, backlog);
258
259 lock_sock(sk);
260
261 if (sk->sk_state != BT_BOUND) {
262 err = -EBADFD;
263 goto done;
264 }
265
266 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
267 err = -EINVAL;
268 goto done;
269 }
270
271 switch (chan->mode) {
272 case L2CAP_MODE_BASIC:
273 case L2CAP_MODE_LE_FLOWCTL:
274 break;
275 case L2CAP_MODE_ERTM:
276 case L2CAP_MODE_STREAMING:
277 if (!disable_ertm)
278 break;
279 /* fall through */
280 default:
281 err = -EOPNOTSUPP;
282 goto done;
283 }
284
285 sk->sk_max_ack_backlog = backlog;
286 sk->sk_ack_backlog = 0;
287
288 /* Listening channels need to use nested locking in order not to
289 * cause lockdep warnings when the created child channels end up
290 * being locked in the same thread as the parent channel.
291 */
292 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
293
294 chan->state = BT_LISTEN;
295 sk->sk_state = BT_LISTEN;
296
297 done:
298 release_sock(sk);
299 return err;
300 }
301
302 static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
303 int flags)
304 {
305 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
353 done:
354 release_sock(sk);
355 return err;
356 }
357
358 static 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
391 static 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
494 static 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
614 static 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
630 static 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
742 static 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_FIPS) {
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, (u16 __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
947 static 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
979 static 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
1035 done:
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 */
1043 static 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
1057 static 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
1102 static 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
1173 has_shutdown:
1174 l2cap_chan_put(chan);
1175 sock_put(sk);
1176
1177 shutdown_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
1188 static 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
1207 static 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
1230 static 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
1261 static 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 if (chan->mode != L2CAP_MODE_ERTM &&
1274 chan->mode != L2CAP_MODE_STREAMING) {
1275 /* Even if no filter is attached, we could potentially
1276 * get errors from security modules, etc.
1277 */
1278 err = sk_filter(sk, skb);
1279 if (err)
1280 goto done;
1281 }
1282
1283 err = __sock_queue_rcv_skb(sk, skb);
1284
1285 /* For ERTM, handle one skb that doesn't fit into the recv
1286 * buffer. This is important to do because the data frames
1287 * have already been acked, so the skb cannot be discarded.
1288 *
1289 * Notify the l2cap core that the buffer is full, so the
1290 * LOCAL_BUSY state is entered and no more frames are
1291 * acked and reassembled until there is buffer space
1292 * available.
1293 */
1294 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1295 l2cap_pi(sk)->rx_busy_skb = skb;
1296 l2cap_chan_busy(chan, 1);
1297 err = 0;
1298 }
1299
1300 done:
1301 release_sock(sk);
1302
1303 return err;
1304 }
1305
1306 static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1307 {
1308 struct sock *sk = chan->data;
1309
1310 l2cap_sock_kill(sk);
1311 }
1312
1313 static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1314 {
1315 struct sock *sk = chan->data;
1316 struct sock *parent;
1317
1318 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1319
1320 /* This callback can be called both for server (BT_LISTEN)
1321 * sockets as well as "normal" ones. To avoid lockdep warnings
1322 * with child socket locking (through l2cap_sock_cleanup_listen)
1323 * we need separation into separate nesting levels. The simplest
1324 * way to accomplish this is to inherit the nesting level used
1325 * for the channel.
1326 */
1327 lock_sock_nested(sk, atomic_read(&chan->nesting));
1328
1329 parent = bt_sk(sk)->parent;
1330
1331 sock_set_flag(sk, SOCK_ZAPPED);
1332
1333 switch (chan->state) {
1334 case BT_OPEN:
1335 case BT_BOUND:
1336 case BT_CLOSED:
1337 break;
1338 case BT_LISTEN:
1339 l2cap_sock_cleanup_listen(sk);
1340 sk->sk_state = BT_CLOSED;
1341 chan->state = BT_CLOSED;
1342
1343 break;
1344 default:
1345 sk->sk_state = BT_CLOSED;
1346 chan->state = BT_CLOSED;
1347
1348 sk->sk_err = err;
1349
1350 if (parent) {
1351 bt_accept_unlink(sk);
1352 parent->sk_data_ready(parent);
1353 } else {
1354 sk->sk_state_change(sk);
1355 }
1356
1357 break;
1358 }
1359
1360 release_sock(sk);
1361 }
1362
1363 static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1364 int err)
1365 {
1366 struct sock *sk = chan->data;
1367
1368 sk->sk_state = state;
1369
1370 if (err)
1371 sk->sk_err = err;
1372 }
1373
1374 static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1375 unsigned long hdr_len,
1376 unsigned long len, int nb)
1377 {
1378 struct sock *sk = chan->data;
1379 struct sk_buff *skb;
1380 int err;
1381
1382 l2cap_chan_unlock(chan);
1383 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1384 l2cap_chan_lock(chan);
1385
1386 if (!skb)
1387 return ERR_PTR(err);
1388
1389 skb->priority = sk->sk_priority;
1390
1391 bt_cb(skb)->l2cap.chan = chan;
1392
1393 return skb;
1394 }
1395
1396 static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1397 {
1398 struct sock *sk = chan->data;
1399 struct sock *parent;
1400
1401 lock_sock(sk);
1402
1403 parent = bt_sk(sk)->parent;
1404
1405 BT_DBG("sk %p, parent %p", sk, parent);
1406
1407 sk->sk_state = BT_CONNECTED;
1408 sk->sk_state_change(sk);
1409
1410 if (parent)
1411 parent->sk_data_ready(parent);
1412
1413 release_sock(sk);
1414 }
1415
1416 static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1417 {
1418 struct sock *parent, *sk = chan->data;
1419
1420 lock_sock(sk);
1421
1422 parent = bt_sk(sk)->parent;
1423 if (parent)
1424 parent->sk_data_ready(parent);
1425
1426 release_sock(sk);
1427 }
1428
1429 static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1430 {
1431 struct sock *sk = chan->data;
1432
1433 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1434 sk->sk_state = BT_CONNECTED;
1435 chan->state = BT_CONNECTED;
1436 }
1437
1438 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1439 sk->sk_state_change(sk);
1440 }
1441
1442 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1443 {
1444 struct sock *sk = chan->data;
1445
1446 lock_sock(sk);
1447 sk->sk_shutdown = SHUTDOWN_MASK;
1448 release_sock(sk);
1449 }
1450
1451 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1452 {
1453 struct sock *sk = chan->data;
1454
1455 return sk->sk_sndtimeo;
1456 }
1457
1458 static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1459 {
1460 struct sock *sk = chan->data;
1461
1462 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1463 sk->sk_state_change(sk);
1464 }
1465
1466 static const struct l2cap_ops l2cap_chan_ops = {
1467 .name = "L2CAP Socket Interface",
1468 .new_connection = l2cap_sock_new_connection_cb,
1469 .recv = l2cap_sock_recv_cb,
1470 .close = l2cap_sock_close_cb,
1471 .teardown = l2cap_sock_teardown_cb,
1472 .state_change = l2cap_sock_state_change_cb,
1473 .ready = l2cap_sock_ready_cb,
1474 .defer = l2cap_sock_defer_cb,
1475 .resume = l2cap_sock_resume_cb,
1476 .suspend = l2cap_sock_suspend_cb,
1477 .set_shutdown = l2cap_sock_set_shutdown_cb,
1478 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1479 .alloc_skb = l2cap_sock_alloc_skb_cb,
1480 };
1481
1482 static void l2cap_sock_destruct(struct sock *sk)
1483 {
1484 BT_DBG("sk %p", sk);
1485
1486 if (l2cap_pi(sk)->chan)
1487 l2cap_chan_put(l2cap_pi(sk)->chan);
1488
1489 if (l2cap_pi(sk)->rx_busy_skb) {
1490 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1491 l2cap_pi(sk)->rx_busy_skb = NULL;
1492 }
1493
1494 skb_queue_purge(&sk->sk_receive_queue);
1495 skb_queue_purge(&sk->sk_write_queue);
1496 }
1497
1498 static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1499 int *msg_namelen)
1500 {
1501 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1502
1503 memset(la, 0, sizeof(struct sockaddr_l2));
1504 la->l2_family = AF_BLUETOOTH;
1505 la->l2_psm = bt_cb(skb)->l2cap.psm;
1506 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr);
1507
1508 *msg_namelen = sizeof(struct sockaddr_l2);
1509 }
1510
1511 static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1512 {
1513 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1514
1515 BT_DBG("sk %p", sk);
1516
1517 if (parent) {
1518 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1519
1520 sk->sk_type = parent->sk_type;
1521 bt_sk(sk)->flags = bt_sk(parent)->flags;
1522
1523 chan->chan_type = pchan->chan_type;
1524 chan->imtu = pchan->imtu;
1525 chan->omtu = pchan->omtu;
1526 chan->conf_state = pchan->conf_state;
1527 chan->mode = pchan->mode;
1528 chan->fcs = pchan->fcs;
1529 chan->max_tx = pchan->max_tx;
1530 chan->tx_win = pchan->tx_win;
1531 chan->tx_win_max = pchan->tx_win_max;
1532 chan->sec_level = pchan->sec_level;
1533 chan->flags = pchan->flags;
1534 chan->tx_credits = pchan->tx_credits;
1535 chan->rx_credits = pchan->rx_credits;
1536
1537 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1538 chan->scid = pchan->scid;
1539 chan->dcid = pchan->scid;
1540 }
1541
1542 security_sk_clone(parent, sk);
1543 } else {
1544 switch (sk->sk_type) {
1545 case SOCK_RAW:
1546 chan->chan_type = L2CAP_CHAN_RAW;
1547 break;
1548 case SOCK_DGRAM:
1549 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1550 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1551 break;
1552 case SOCK_SEQPACKET:
1553 case SOCK_STREAM:
1554 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1555 break;
1556 }
1557
1558 chan->imtu = L2CAP_DEFAULT_MTU;
1559 chan->omtu = 0;
1560 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1561 chan->mode = L2CAP_MODE_ERTM;
1562 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1563 } else {
1564 chan->mode = L2CAP_MODE_BASIC;
1565 }
1566
1567 l2cap_chan_set_defaults(chan);
1568 }
1569
1570 /* Default config options */
1571 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1572
1573 chan->data = sk;
1574 chan->ops = &l2cap_chan_ops;
1575 }
1576
1577 static struct proto l2cap_proto = {
1578 .name = "L2CAP",
1579 .owner = THIS_MODULE,
1580 .obj_size = sizeof(struct l2cap_pinfo)
1581 };
1582
1583 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1584 int proto, gfp_t prio, int kern)
1585 {
1586 struct sock *sk;
1587 struct l2cap_chan *chan;
1588
1589 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, kern);
1590 if (!sk)
1591 return NULL;
1592
1593 sock_init_data(sock, sk);
1594 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1595
1596 sk->sk_destruct = l2cap_sock_destruct;
1597 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1598
1599 sock_reset_flag(sk, SOCK_ZAPPED);
1600
1601 sk->sk_protocol = proto;
1602 sk->sk_state = BT_OPEN;
1603
1604 chan = l2cap_chan_create();
1605 if (!chan) {
1606 sk_free(sk);
1607 return NULL;
1608 }
1609
1610 l2cap_chan_hold(chan);
1611
1612 l2cap_pi(sk)->chan = chan;
1613
1614 return sk;
1615 }
1616
1617 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1618 int kern)
1619 {
1620 struct sock *sk;
1621
1622 BT_DBG("sock %p", sock);
1623
1624 sock->state = SS_UNCONNECTED;
1625
1626 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1627 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1628 return -ESOCKTNOSUPPORT;
1629
1630 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1631 return -EPERM;
1632
1633 sock->ops = &l2cap_sock_ops;
1634
1635 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
1636 if (!sk)
1637 return -ENOMEM;
1638
1639 l2cap_sock_init(sk, NULL);
1640 bt_sock_link(&l2cap_sk_list, sk);
1641 return 0;
1642 }
1643
1644 static const struct proto_ops l2cap_sock_ops = {
1645 .family = PF_BLUETOOTH,
1646 .owner = THIS_MODULE,
1647 .release = l2cap_sock_release,
1648 .bind = l2cap_sock_bind,
1649 .connect = l2cap_sock_connect,
1650 .listen = l2cap_sock_listen,
1651 .accept = l2cap_sock_accept,
1652 .getname = l2cap_sock_getname,
1653 .sendmsg = l2cap_sock_sendmsg,
1654 .recvmsg = l2cap_sock_recvmsg,
1655 .poll = bt_sock_poll,
1656 .ioctl = bt_sock_ioctl,
1657 .mmap = sock_no_mmap,
1658 .socketpair = sock_no_socketpair,
1659 .shutdown = l2cap_sock_shutdown,
1660 .setsockopt = l2cap_sock_setsockopt,
1661 .getsockopt = l2cap_sock_getsockopt
1662 };
1663
1664 static const struct net_proto_family l2cap_sock_family_ops = {
1665 .family = PF_BLUETOOTH,
1666 .owner = THIS_MODULE,
1667 .create = l2cap_sock_create,
1668 };
1669
1670 int __init l2cap_init_sockets(void)
1671 {
1672 int err;
1673
1674 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1675
1676 err = proto_register(&l2cap_proto, 0);
1677 if (err < 0)
1678 return err;
1679
1680 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1681 if (err < 0) {
1682 BT_ERR("L2CAP socket registration failed");
1683 goto error;
1684 }
1685
1686 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1687 NULL);
1688 if (err < 0) {
1689 BT_ERR("Failed to create L2CAP proc file");
1690 bt_sock_unregister(BTPROTO_L2CAP);
1691 goto error;
1692 }
1693
1694 BT_INFO("L2CAP socket layer initialized");
1695
1696 return 0;
1697
1698 error:
1699 proto_unregister(&l2cap_proto);
1700 return err;
1701 }
1702
1703 void l2cap_cleanup_sockets(void)
1704 {
1705 bt_procfs_cleanup(&init_net, "l2cap");
1706 bt_sock_unregister(BTPROTO_L2CAP);
1707 proto_unregister(&l2cap_proto);
1708 }
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