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[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);
47
48 bool l2cap_is_socket(struct socket *sock)
49 {
50 return sock && sock->ops == &l2cap_sock_ops;
51 }
52 EXPORT_SYMBOL(l2cap_is_socket);
53
54 static int l2cap_validate_bredr_psm(u16 psm)
55 {
56 /* PSM must be odd and lsb of upper byte must be 0 */
57 if ((psm & 0x0101) != 0x0001)
58 return -EINVAL;
59
60 /* Restrict usage of well-known PSMs */
61 if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE))
62 return -EACCES;
63
64 return 0;
65 }
66
67 static int l2cap_validate_le_psm(u16 psm)
68 {
69 /* Valid LE_PSM ranges are defined only until 0x00ff */
70 if (psm > 0x00ff)
71 return -EINVAL;
72
73 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
74 if (psm <= 0x007f && !capable(CAP_NET_BIND_SERVICE))
75 return -EACCES;
76
77 return 0;
78 }
79
80 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
81 {
82 struct sock *sk = sock->sk;
83 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
84 struct sockaddr_l2 la;
85 int len, err = 0;
86
87 BT_DBG("sk %p", sk);
88
89 if (!addr || addr->sa_family != AF_BLUETOOTH)
90 return -EINVAL;
91
92 memset(&la, 0, sizeof(la));
93 len = min_t(unsigned int, sizeof(la), alen);
94 memcpy(&la, addr, len);
95
96 if (la.l2_cid && la.l2_psm)
97 return -EINVAL;
98
99 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
100 return -EINVAL;
101
102 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
103 /* We only allow ATT user space socket */
104 if (la.l2_cid &&
105 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
106 return -EINVAL;
107 }
108
109 lock_sock(sk);
110
111 if (sk->sk_state != BT_OPEN) {
112 err = -EBADFD;
113 goto done;
114 }
115
116 if (la.l2_psm) {
117 __u16 psm = __le16_to_cpu(la.l2_psm);
118
119 if (la.l2_bdaddr_type == BDADDR_BREDR)
120 err = l2cap_validate_bredr_psm(psm);
121 else
122 err = l2cap_validate_le_psm(psm);
123
124 if (err)
125 goto done;
126 }
127
128 if (la.l2_cid)
129 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
130 else
131 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
132
133 if (err < 0)
134 goto done;
135
136 switch (chan->chan_type) {
137 case L2CAP_CHAN_CONN_LESS:
138 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP)
139 chan->sec_level = BT_SECURITY_SDP;
140 break;
141 case L2CAP_CHAN_CONN_ORIENTED:
142 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP ||
143 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM)
144 chan->sec_level = BT_SECURITY_SDP;
145 break;
146 case L2CAP_CHAN_RAW:
147 chan->sec_level = BT_SECURITY_SDP;
148 break;
149 case L2CAP_CHAN_FIXED:
150 /* Fixed channels default to the L2CAP core not holding a
151 * hci_conn reference for them. For fixed channels mapping to
152 * L2CAP sockets we do want to hold a reference so set the
153 * appropriate flag to request it.
154 */
155 set_bit(FLAG_HOLD_HCI_CONN, &chan->flags);
156 break;
157 }
158
159 bacpy(&chan->src, &la.l2_bdaddr);
160 chan->src_type = la.l2_bdaddr_type;
161
162 if (chan->psm && bdaddr_type_is_le(chan->src_type))
163 chan->mode = L2CAP_MODE_LE_FLOWCTL;
164
165 chan->state = BT_BOUND;
166 sk->sk_state = BT_BOUND;
167
168 done:
169 release_sock(sk);
170 return err;
171 }
172
173 static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
174 int alen, int flags)
175 {
176 struct sock *sk = sock->sk;
177 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
178 struct sockaddr_l2 la;
179 int len, err = 0;
180
181 BT_DBG("sk %p", sk);
182
183 if (!addr || alen < sizeof(addr->sa_family) ||
184 addr->sa_family != AF_BLUETOOTH)
185 return -EINVAL;
186
187 memset(&la, 0, sizeof(la));
188 len = min_t(unsigned int, sizeof(la), alen);
189 memcpy(&la, addr, len);
190
191 if (la.l2_cid && la.l2_psm)
192 return -EINVAL;
193
194 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
195 return -EINVAL;
196
197 /* Check that the socket wasn't bound to something that
198 * conflicts with the address given to connect(). If chan->src
199 * is BDADDR_ANY it means bind() was never used, in which case
200 * chan->src_type and la.l2_bdaddr_type do not need to match.
201 */
202 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
203 bdaddr_type_is_le(la.l2_bdaddr_type)) {
204 /* Old user space versions will try to incorrectly bind
205 * the ATT socket using BDADDR_BREDR. We need to accept
206 * this and fix up the source address type only when
207 * both the source CID and destination CID indicate
208 * ATT. Anything else is an invalid combination.
209 */
210 if (chan->scid != L2CAP_CID_ATT ||
211 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
212 return -EINVAL;
213
214 /* We don't have the hdev available here to make a
215 * better decision on random vs public, but since all
216 * user space versions that exhibit this issue anyway do
217 * not support random local addresses assuming public
218 * here is good enough.
219 */
220 chan->src_type = BDADDR_LE_PUBLIC;
221 }
222
223 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
224 return -EINVAL;
225
226 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
227 /* We only allow ATT user space socket */
228 if (la.l2_cid &&
229 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
230 return -EINVAL;
231 }
232
233 if (chan->psm && bdaddr_type_is_le(chan->src_type))
234 chan->mode = L2CAP_MODE_LE_FLOWCTL;
235
236 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
237 &la.l2_bdaddr, la.l2_bdaddr_type);
238 if (err)
239 return err;
240
241 lock_sock(sk);
242
243 err = bt_sock_wait_state(sk, BT_CONNECTED,
244 sock_sndtimeo(sk, flags & O_NONBLOCK));
245
246 release_sock(sk);
247
248 return err;
249 }
250
251 static int l2cap_sock_listen(struct socket *sock, int backlog)
252 {
253 struct sock *sk = sock->sk;
254 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
255 int err = 0;
256
257 BT_DBG("sk %p backlog %d", sk, backlog);
258
259 lock_sock(sk);
260
261 if (sk->sk_state != BT_BOUND) {
262 err = -EBADFD;
263 goto done;
264 }
265
266 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
267 err = -EINVAL;
268 goto done;
269 }
270
271 switch (chan->mode) {
272 case L2CAP_MODE_BASIC:
273 case L2CAP_MODE_LE_FLOWCTL:
274 break;
275 case L2CAP_MODE_ERTM:
276 case L2CAP_MODE_STREAMING:
277 if (!disable_ertm)
278 break;
279 /* fall through */
280 default:
281 err = -EOPNOTSUPP;
282 goto done;
283 }
284
285 sk->sk_max_ack_backlog = backlog;
286 sk->sk_ack_backlog = 0;
287
288 /* Listening channels need to use nested locking in order not to
289 * cause lockdep warnings when the created child channels end up
290 * being locked in the same thread as the parent channel.
291 */
292 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
293
294 chan->state = BT_LISTEN;
295 sk->sk_state = BT_LISTEN;
296
297 done:
298 release_sock(sk);
299 return err;
300 }
301
302 static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
303 int flags)
304 {
305 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_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
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)
1058 {
1059 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1060 DECLARE_WAITQUEUE(wait, current);
1061 int err = 0;
1062 int timeo = HZ/5;
1063
1064 add_wait_queue(sk_sleep(sk), &wait);
1065 set_current_state(TASK_INTERRUPTIBLE);
1066 while (chan->unacked_frames > 0 && chan->conn) {
1067 if (!timeo)
1068 timeo = HZ/5;
1069
1070 if (signal_pending(current)) {
1071 err = sock_intr_errno(timeo);
1072 break;
1073 }
1074
1075 release_sock(sk);
1076 timeo = schedule_timeout(timeo);
1077 lock_sock(sk);
1078 set_current_state(TASK_INTERRUPTIBLE);
1079
1080 err = sock_error(sk);
1081 if (err)
1082 break;
1083 }
1084 set_current_state(TASK_RUNNING);
1085 remove_wait_queue(sk_sleep(sk), &wait);
1086 return err;
1087 }
1088
1089 static int l2cap_sock_shutdown(struct socket *sock, int how)
1090 {
1091 struct sock *sk = sock->sk;
1092 struct l2cap_chan *chan;
1093 struct l2cap_conn *conn;
1094 int err = 0;
1095
1096 BT_DBG("sock %p, sk %p", sock, sk);
1097
1098 if (!sk)
1099 return 0;
1100
1101 chan = l2cap_pi(sk)->chan;
1102 conn = chan->conn;
1103
1104 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1105
1106 if (conn)
1107 mutex_lock(&conn->chan_lock);
1108
1109 l2cap_chan_lock(chan);
1110 lock_sock(sk);
1111
1112 if (!sk->sk_shutdown) {
1113 if (chan->mode == L2CAP_MODE_ERTM)
1114 err = __l2cap_wait_ack(sk);
1115
1116 sk->sk_shutdown = SHUTDOWN_MASK;
1117
1118 release_sock(sk);
1119 l2cap_chan_close(chan, 0);
1120 lock_sock(sk);
1121
1122 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1123 !(current->flags & PF_EXITING))
1124 err = bt_sock_wait_state(sk, BT_CLOSED,
1125 sk->sk_lingertime);
1126 }
1127
1128 if (!err && sk->sk_err)
1129 err = -sk->sk_err;
1130
1131 release_sock(sk);
1132 l2cap_chan_unlock(chan);
1133
1134 if (conn)
1135 mutex_unlock(&conn->chan_lock);
1136
1137 return err;
1138 }
1139
1140 static int l2cap_sock_release(struct socket *sock)
1141 {
1142 struct sock *sk = sock->sk;
1143 int err;
1144
1145 BT_DBG("sock %p, sk %p", sock, sk);
1146
1147 if (!sk)
1148 return 0;
1149
1150 bt_sock_unlink(&l2cap_sk_list, sk);
1151
1152 err = l2cap_sock_shutdown(sock, 2);
1153
1154 sock_orphan(sk);
1155 l2cap_sock_kill(sk);
1156 return err;
1157 }
1158
1159 static void l2cap_sock_cleanup_listen(struct sock *parent)
1160 {
1161 struct sock *sk;
1162
1163 BT_DBG("parent %p state %s", parent,
1164 state_to_string(parent->sk_state));
1165
1166 /* Close not yet accepted channels */
1167 while ((sk = bt_accept_dequeue(parent, NULL))) {
1168 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1169
1170 BT_DBG("child chan %p state %s", chan,
1171 state_to_string(chan->state));
1172
1173 l2cap_chan_lock(chan);
1174 __clear_chan_timer(chan);
1175 l2cap_chan_close(chan, ECONNRESET);
1176 l2cap_chan_unlock(chan);
1177
1178 l2cap_sock_kill(sk);
1179 }
1180 }
1181
1182 static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1183 {
1184 struct sock *sk, *parent = chan->data;
1185
1186 lock_sock(parent);
1187
1188 /* Check for backlog size */
1189 if (sk_acceptq_is_full(parent)) {
1190 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1191 release_sock(parent);
1192 return NULL;
1193 }
1194
1195 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1196 GFP_ATOMIC);
1197 if (!sk) {
1198 release_sock(parent);
1199 return NULL;
1200 }
1201
1202 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1203
1204 l2cap_sock_init(sk, parent);
1205
1206 bt_accept_enqueue(parent, sk);
1207
1208 release_sock(parent);
1209
1210 return l2cap_pi(sk)->chan;
1211 }
1212
1213 static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1214 {
1215 struct sock *sk = chan->data;
1216 int err;
1217
1218 lock_sock(sk);
1219
1220 if (l2cap_pi(sk)->rx_busy_skb) {
1221 err = -ENOMEM;
1222 goto done;
1223 }
1224
1225 err = sock_queue_rcv_skb(sk, skb);
1226
1227 /* For ERTM, handle one skb that doesn't fit into the recv
1228 * buffer. This is important to do because the data frames
1229 * have already been acked, so the skb cannot be discarded.
1230 *
1231 * Notify the l2cap core that the buffer is full, so the
1232 * LOCAL_BUSY state is entered and no more frames are
1233 * acked and reassembled until there is buffer space
1234 * available.
1235 */
1236 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1237 l2cap_pi(sk)->rx_busy_skb = skb;
1238 l2cap_chan_busy(chan, 1);
1239 err = 0;
1240 }
1241
1242 done:
1243 release_sock(sk);
1244
1245 return err;
1246 }
1247
1248 static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1249 {
1250 struct sock *sk = chan->data;
1251
1252 l2cap_sock_kill(sk);
1253 }
1254
1255 static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1256 {
1257 struct sock *sk = chan->data;
1258 struct sock *parent;
1259
1260 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1261
1262 /* This callback can be called both for server (BT_LISTEN)
1263 * sockets as well as "normal" ones. To avoid lockdep warnings
1264 * with child socket locking (through l2cap_sock_cleanup_listen)
1265 * we need separation into separate nesting levels. The simplest
1266 * way to accomplish this is to inherit the nesting level used
1267 * for the channel.
1268 */
1269 lock_sock_nested(sk, atomic_read(&chan->nesting));
1270
1271 parent = bt_sk(sk)->parent;
1272
1273 sock_set_flag(sk, SOCK_ZAPPED);
1274
1275 switch (chan->state) {
1276 case BT_OPEN:
1277 case BT_BOUND:
1278 case BT_CLOSED:
1279 break;
1280 case BT_LISTEN:
1281 l2cap_sock_cleanup_listen(sk);
1282 sk->sk_state = BT_CLOSED;
1283 chan->state = BT_CLOSED;
1284
1285 break;
1286 default:
1287 sk->sk_state = BT_CLOSED;
1288 chan->state = BT_CLOSED;
1289
1290 sk->sk_err = err;
1291
1292 if (parent) {
1293 bt_accept_unlink(sk);
1294 parent->sk_data_ready(parent);
1295 } else {
1296 sk->sk_state_change(sk);
1297 }
1298
1299 break;
1300 }
1301
1302 release_sock(sk);
1303 }
1304
1305 static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1306 int err)
1307 {
1308 struct sock *sk = chan->data;
1309
1310 sk->sk_state = state;
1311
1312 if (err)
1313 sk->sk_err = err;
1314 }
1315
1316 static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1317 unsigned long hdr_len,
1318 unsigned long len, int nb)
1319 {
1320 struct sock *sk = chan->data;
1321 struct sk_buff *skb;
1322 int err;
1323
1324 l2cap_chan_unlock(chan);
1325 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1326 l2cap_chan_lock(chan);
1327
1328 if (!skb)
1329 return ERR_PTR(err);
1330
1331 skb->priority = sk->sk_priority;
1332
1333 bt_cb(skb)->chan = chan;
1334
1335 return skb;
1336 }
1337
1338 static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1339 {
1340 struct sock *sk = chan->data;
1341 struct sock *parent;
1342
1343 lock_sock(sk);
1344
1345 parent = bt_sk(sk)->parent;
1346
1347 BT_DBG("sk %p, parent %p", sk, parent);
1348
1349 sk->sk_state = BT_CONNECTED;
1350 sk->sk_state_change(sk);
1351
1352 if (parent)
1353 parent->sk_data_ready(parent);
1354
1355 release_sock(sk);
1356 }
1357
1358 static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1359 {
1360 struct sock *parent, *sk = chan->data;
1361
1362 lock_sock(sk);
1363
1364 parent = bt_sk(sk)->parent;
1365 if (parent)
1366 parent->sk_data_ready(parent);
1367
1368 release_sock(sk);
1369 }
1370
1371 static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1372 {
1373 struct sock *sk = chan->data;
1374
1375 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1376 sk->sk_state = BT_CONNECTED;
1377 chan->state = BT_CONNECTED;
1378 }
1379
1380 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1381 sk->sk_state_change(sk);
1382 }
1383
1384 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1385 {
1386 struct sock *sk = chan->data;
1387
1388 lock_sock(sk);
1389 sk->sk_shutdown = SHUTDOWN_MASK;
1390 release_sock(sk);
1391 }
1392
1393 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1394 {
1395 struct sock *sk = chan->data;
1396
1397 return sk->sk_sndtimeo;
1398 }
1399
1400 static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1401 {
1402 struct sock *sk = chan->data;
1403
1404 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1405 sk->sk_state_change(sk);
1406 }
1407
1408 static const struct l2cap_ops l2cap_chan_ops = {
1409 .name = "L2CAP Socket Interface",
1410 .new_connection = l2cap_sock_new_connection_cb,
1411 .recv = l2cap_sock_recv_cb,
1412 .close = l2cap_sock_close_cb,
1413 .teardown = l2cap_sock_teardown_cb,
1414 .state_change = l2cap_sock_state_change_cb,
1415 .ready = l2cap_sock_ready_cb,
1416 .defer = l2cap_sock_defer_cb,
1417 .resume = l2cap_sock_resume_cb,
1418 .suspend = l2cap_sock_suspend_cb,
1419 .set_shutdown = l2cap_sock_set_shutdown_cb,
1420 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1421 .alloc_skb = l2cap_sock_alloc_skb_cb,
1422 };
1423
1424 static void l2cap_sock_destruct(struct sock *sk)
1425 {
1426 BT_DBG("sk %p", sk);
1427
1428 if (l2cap_pi(sk)->chan)
1429 l2cap_chan_put(l2cap_pi(sk)->chan);
1430
1431 if (l2cap_pi(sk)->rx_busy_skb) {
1432 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1433 l2cap_pi(sk)->rx_busy_skb = NULL;
1434 }
1435
1436 skb_queue_purge(&sk->sk_receive_queue);
1437 skb_queue_purge(&sk->sk_write_queue);
1438 }
1439
1440 static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1441 int *msg_namelen)
1442 {
1443 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1444
1445 memset(la, 0, sizeof(struct sockaddr_l2));
1446 la->l2_family = AF_BLUETOOTH;
1447 la->l2_psm = bt_cb(skb)->psm;
1448 bacpy(&la->l2_bdaddr, &bt_cb(skb)->bdaddr);
1449
1450 *msg_namelen = sizeof(struct sockaddr_l2);
1451 }
1452
1453 static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1454 {
1455 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1456
1457 BT_DBG("sk %p", sk);
1458
1459 if (parent) {
1460 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1461
1462 sk->sk_type = parent->sk_type;
1463 bt_sk(sk)->flags = bt_sk(parent)->flags;
1464
1465 chan->chan_type = pchan->chan_type;
1466 chan->imtu = pchan->imtu;
1467 chan->omtu = pchan->omtu;
1468 chan->conf_state = pchan->conf_state;
1469 chan->mode = pchan->mode;
1470 chan->fcs = pchan->fcs;
1471 chan->max_tx = pchan->max_tx;
1472 chan->tx_win = pchan->tx_win;
1473 chan->tx_win_max = pchan->tx_win_max;
1474 chan->sec_level = pchan->sec_level;
1475 chan->flags = pchan->flags;
1476 chan->tx_credits = pchan->tx_credits;
1477 chan->rx_credits = pchan->rx_credits;
1478
1479 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1480 chan->scid = pchan->scid;
1481 chan->dcid = pchan->scid;
1482 }
1483
1484 security_sk_clone(parent, sk);
1485 } else {
1486 switch (sk->sk_type) {
1487 case SOCK_RAW:
1488 chan->chan_type = L2CAP_CHAN_RAW;
1489 break;
1490 case SOCK_DGRAM:
1491 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1492 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1493 break;
1494 case SOCK_SEQPACKET:
1495 case SOCK_STREAM:
1496 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1497 break;
1498 }
1499
1500 chan->imtu = L2CAP_DEFAULT_MTU;
1501 chan->omtu = 0;
1502 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1503 chan->mode = L2CAP_MODE_ERTM;
1504 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1505 } else {
1506 chan->mode = L2CAP_MODE_BASIC;
1507 }
1508
1509 l2cap_chan_set_defaults(chan);
1510 }
1511
1512 /* Default config options */
1513 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1514
1515 chan->data = sk;
1516 chan->ops = &l2cap_chan_ops;
1517 }
1518
1519 static struct proto l2cap_proto = {
1520 .name = "L2CAP",
1521 .owner = THIS_MODULE,
1522 .obj_size = sizeof(struct l2cap_pinfo)
1523 };
1524
1525 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1526 int proto, gfp_t prio)
1527 {
1528 struct sock *sk;
1529 struct l2cap_chan *chan;
1530
1531 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
1532 if (!sk)
1533 return NULL;
1534
1535 sock_init_data(sock, sk);
1536 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1537
1538 sk->sk_destruct = l2cap_sock_destruct;
1539 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1540
1541 sock_reset_flag(sk, SOCK_ZAPPED);
1542
1543 sk->sk_protocol = proto;
1544 sk->sk_state = BT_OPEN;
1545
1546 chan = l2cap_chan_create();
1547 if (!chan) {
1548 sk_free(sk);
1549 return NULL;
1550 }
1551
1552 l2cap_chan_hold(chan);
1553
1554 l2cap_pi(sk)->chan = chan;
1555
1556 return sk;
1557 }
1558
1559 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1560 int kern)
1561 {
1562 struct sock *sk;
1563
1564 BT_DBG("sock %p", sock);
1565
1566 sock->state = SS_UNCONNECTED;
1567
1568 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1569 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1570 return -ESOCKTNOSUPPORT;
1571
1572 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1573 return -EPERM;
1574
1575 sock->ops = &l2cap_sock_ops;
1576
1577 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
1578 if (!sk)
1579 return -ENOMEM;
1580
1581 l2cap_sock_init(sk, NULL);
1582 bt_sock_link(&l2cap_sk_list, sk);
1583 return 0;
1584 }
1585
1586 static const struct proto_ops l2cap_sock_ops = {
1587 .family = PF_BLUETOOTH,
1588 .owner = THIS_MODULE,
1589 .release = l2cap_sock_release,
1590 .bind = l2cap_sock_bind,
1591 .connect = l2cap_sock_connect,
1592 .listen = l2cap_sock_listen,
1593 .accept = l2cap_sock_accept,
1594 .getname = l2cap_sock_getname,
1595 .sendmsg = l2cap_sock_sendmsg,
1596 .recvmsg = l2cap_sock_recvmsg,
1597 .poll = bt_sock_poll,
1598 .ioctl = bt_sock_ioctl,
1599 .mmap = sock_no_mmap,
1600 .socketpair = sock_no_socketpair,
1601 .shutdown = l2cap_sock_shutdown,
1602 .setsockopt = l2cap_sock_setsockopt,
1603 .getsockopt = l2cap_sock_getsockopt
1604 };
1605
1606 static const struct net_proto_family l2cap_sock_family_ops = {
1607 .family = PF_BLUETOOTH,
1608 .owner = THIS_MODULE,
1609 .create = l2cap_sock_create,
1610 };
1611
1612 int __init l2cap_init_sockets(void)
1613 {
1614 int err;
1615
1616 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1617
1618 err = proto_register(&l2cap_proto, 0);
1619 if (err < 0)
1620 return err;
1621
1622 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1623 if (err < 0) {
1624 BT_ERR("L2CAP socket registration failed");
1625 goto error;
1626 }
1627
1628 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1629 NULL);
1630 if (err < 0) {
1631 BT_ERR("Failed to create L2CAP proc file");
1632 bt_sock_unregister(BTPROTO_L2CAP);
1633 goto error;
1634 }
1635
1636 BT_INFO("L2CAP socket layer initialized");
1637
1638 return 0;
1639
1640 error:
1641 proto_unregister(&l2cap_proto);
1642 return err;
1643 }
1644
1645 void l2cap_cleanup_sockets(void)
1646 {
1647 bt_procfs_cleanup(&init_net, "l2cap");
1648 bt_sock_unregister(BTPROTO_L2CAP);
1649 proto_unregister(&l2cap_proto);
1650 }
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