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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#include <linux/filter.h>
33#include <linux/sched/signal.h>
34
35#include <net/bluetooth/bluetooth.h>
36#include <net/bluetooth/hci_core.h>
37#include <net/bluetooth/l2cap.h>
38
39#include "smp.h"
40
41static struct bt_sock_list l2cap_sk_list = {
42 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
43};
44
45static const struct proto_ops l2cap_sock_ops;
46static void l2cap_sock_init(struct sock *sk, struct sock *parent);
47static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
48 int proto, gfp_t prio, int kern);
49static void l2cap_sock_cleanup_listen(struct sock *parent);
50
51bool l2cap_is_socket(struct socket *sock)
52{
53 return sock && sock->ops == &l2cap_sock_ops;
54}
55EXPORT_SYMBOL(l2cap_is_socket);
56
57static int l2cap_validate_bredr_psm(u16 psm)
58{
59 /* PSM must be odd and lsb of upper byte must be 0 */
60 if ((psm & 0x0101) != 0x0001)
61 return -EINVAL;
62
63 /* Restrict usage of well-known PSMs */
64 if (psm < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE))
65 return -EACCES;
66
67 return 0;
68}
69
70static int l2cap_validate_le_psm(u16 psm)
71{
72 /* Valid LE_PSM ranges are defined only until 0x00ff */
73 if (psm > L2CAP_PSM_LE_DYN_END)
74 return -EINVAL;
75
76 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
77 if (psm < L2CAP_PSM_LE_DYN_START && !capable(CAP_NET_BIND_SERVICE))
78 return -EACCES;
79
80 return 0;
81}
82
83static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
84{
85 struct sock *sk = sock->sk;
86 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
87 struct sockaddr_l2 la;
88 int len, err = 0;
89
90 BT_DBG("sk %p", sk);
91
92 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
93 addr->sa_family != AF_BLUETOOTH)
94 return -EINVAL;
95
96 memset(&la, 0, sizeof(la));
97 len = min_t(unsigned int, sizeof(la), alen);
98 memcpy(&la, addr, len);
99
100 if (la.l2_cid && la.l2_psm)
101 return -EINVAL;
102
103 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
104 return -EINVAL;
105
106 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
107 /* We only allow ATT user space socket */
108 if (la.l2_cid &&
109 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
110 return -EINVAL;
111 }
112
113 lock_sock(sk);
114
115 if (sk->sk_state != BT_OPEN) {
116 err = -EBADFD;
117 goto done;
118 }
119
120 if (la.l2_psm) {
121 __u16 psm = __le16_to_cpu(la.l2_psm);
122
123 if (la.l2_bdaddr_type == BDADDR_BREDR)
124 err = l2cap_validate_bredr_psm(psm);
125 else
126 err = l2cap_validate_le_psm(psm);
127
128 if (err)
129 goto done;
130 }
131
132 bacpy(&chan->src, &la.l2_bdaddr);
133 chan->src_type = la.l2_bdaddr_type;
134
135 if (la.l2_cid)
136 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
137 else
138 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
139
140 if (err < 0)
141 goto done;
142
143 switch (chan->chan_type) {
144 case L2CAP_CHAN_CONN_LESS:
145 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP)
146 chan->sec_level = BT_SECURITY_SDP;
147 break;
148 case L2CAP_CHAN_CONN_ORIENTED:
149 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP ||
150 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM)
151 chan->sec_level = BT_SECURITY_SDP;
152 break;
153 case L2CAP_CHAN_RAW:
154 chan->sec_level = BT_SECURITY_SDP;
155 break;
156 case L2CAP_CHAN_FIXED:
157 /* Fixed channels default to the L2CAP core not holding a
158 * hci_conn reference for them. For fixed channels mapping to
159 * L2CAP sockets we do want to hold a reference so set the
160 * appropriate flag to request it.
161 */
162 set_bit(FLAG_HOLD_HCI_CONN, &chan->flags);
163 break;
164 }
165
166 /* Use L2CAP_MODE_LE_FLOWCTL (CoC) in case of LE address and
167 * L2CAP_MODE_EXT_FLOWCTL (ECRED) has not been set.
168 */
169 if (chan->psm && bdaddr_type_is_le(chan->src_type) &&
170 chan->mode != L2CAP_MODE_EXT_FLOWCTL)
171 chan->mode = L2CAP_MODE_LE_FLOWCTL;
172
173 chan->state = BT_BOUND;
174 sk->sk_state = BT_BOUND;
175
176done:
177 release_sock(sk);
178 return err;
179}
180
181static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
182 int alen, int flags)
183{
184 struct sock *sk = sock->sk;
185 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
186 struct sockaddr_l2 la;
187 int len, err = 0;
188 bool zapped;
189
190 BT_DBG("sk %p", sk);
191
192 lock_sock(sk);
193 zapped = sock_flag(sk, SOCK_ZAPPED);
194 release_sock(sk);
195
196 if (zapped)
197 return -EINVAL;
198
199 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
200 addr->sa_family != AF_BLUETOOTH)
201 return -EINVAL;
202
203 memset(&la, 0, sizeof(la));
204 len = min_t(unsigned int, sizeof(la), alen);
205 memcpy(&la, addr, len);
206
207 if (la.l2_cid && la.l2_psm)
208 return -EINVAL;
209
210 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
211 return -EINVAL;
212
213 /* Check that the socket wasn't bound to something that
214 * conflicts with the address given to connect(). If chan->src
215 * is BDADDR_ANY it means bind() was never used, in which case
216 * chan->src_type and la.l2_bdaddr_type do not need to match.
217 */
218 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
219 bdaddr_type_is_le(la.l2_bdaddr_type)) {
220 /* Old user space versions will try to incorrectly bind
221 * the ATT socket using BDADDR_BREDR. We need to accept
222 * this and fix up the source address type only when
223 * both the source CID and destination CID indicate
224 * ATT. Anything else is an invalid combination.
225 */
226 if (chan->scid != L2CAP_CID_ATT ||
227 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
228 return -EINVAL;
229
230 /* We don't have the hdev available here to make a
231 * better decision on random vs public, but since all
232 * user space versions that exhibit this issue anyway do
233 * not support random local addresses assuming public
234 * here is good enough.
235 */
236 chan->src_type = BDADDR_LE_PUBLIC;
237 }
238
239 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
240 return -EINVAL;
241
242 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
243 /* We only allow ATT user space socket */
244 if (la.l2_cid &&
245 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
246 return -EINVAL;
247 }
248
249 /* Use L2CAP_MODE_LE_FLOWCTL (CoC) in case of LE address and
250 * L2CAP_MODE_EXT_FLOWCTL (ECRED) has not been set.
251 */
252 if (chan->psm && bdaddr_type_is_le(chan->src_type) &&
253 chan->mode != L2CAP_MODE_EXT_FLOWCTL)
254 chan->mode = L2CAP_MODE_LE_FLOWCTL;
255
256 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
257 &la.l2_bdaddr, la.l2_bdaddr_type);
258 if (err)
259 return err;
260
261 lock_sock(sk);
262
263 err = bt_sock_wait_state(sk, BT_CONNECTED,
264 sock_sndtimeo(sk, flags & O_NONBLOCK));
265
266 release_sock(sk);
267
268 return err;
269}
270
271static int l2cap_sock_listen(struct socket *sock, int backlog)
272{
273 struct sock *sk = sock->sk;
274 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
275 int err = 0;
276
277 BT_DBG("sk %p backlog %d", sk, backlog);
278
279 lock_sock(sk);
280
281 if (sk->sk_state != BT_BOUND) {
282 err = -EBADFD;
283 goto done;
284 }
285
286 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
287 err = -EINVAL;
288 goto done;
289 }
290
291 switch (chan->mode) {
292 case L2CAP_MODE_BASIC:
293 case L2CAP_MODE_LE_FLOWCTL:
294 break;
295 case L2CAP_MODE_EXT_FLOWCTL:
296 if (!enable_ecred) {
297 err = -EOPNOTSUPP;
298 goto done;
299 }
300 break;
301 case L2CAP_MODE_ERTM:
302 case L2CAP_MODE_STREAMING:
303 if (!disable_ertm)
304 break;
305 fallthrough;
306 default:
307 err = -EOPNOTSUPP;
308 goto done;
309 }
310
311 sk->sk_max_ack_backlog = backlog;
312 sk->sk_ack_backlog = 0;
313
314 /* Listening channels need to use nested locking in order not to
315 * cause lockdep warnings when the created child channels end up
316 * being locked in the same thread as the parent channel.
317 */
318 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
319
320 chan->state = BT_LISTEN;
321 sk->sk_state = BT_LISTEN;
322
323done:
324 release_sock(sk);
325 return err;
326}
327
328static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
329 int flags, bool kern)
330{
331 DEFINE_WAIT_FUNC(wait, woken_wake_function);
332 struct sock *sk = sock->sk, *nsk;
333 long timeo;
334 int err = 0;
335
336 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
337
338 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
339
340 BT_DBG("sk %p timeo %ld", sk, timeo);
341
342 /* Wait for an incoming connection. (wake-one). */
343 add_wait_queue_exclusive(sk_sleep(sk), &wait);
344 while (1) {
345 if (sk->sk_state != BT_LISTEN) {
346 err = -EBADFD;
347 break;
348 }
349
350 nsk = bt_accept_dequeue(sk, newsock);
351 if (nsk)
352 break;
353
354 if (!timeo) {
355 err = -EAGAIN;
356 break;
357 }
358
359 if (signal_pending(current)) {
360 err = sock_intr_errno(timeo);
361 break;
362 }
363
364 release_sock(sk);
365
366 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
367
368 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
369 }
370 remove_wait_queue(sk_sleep(sk), &wait);
371
372 if (err)
373 goto done;
374
375 newsock->state = SS_CONNECTED;
376
377 BT_DBG("new socket %p", nsk);
378
379done:
380 release_sock(sk);
381 return err;
382}
383
384static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
385 int peer)
386{
387 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
388 struct sock *sk = sock->sk;
389 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
390
391 BT_DBG("sock %p, sk %p", sock, sk);
392
393 if (peer && sk->sk_state != BT_CONNECTED &&
394 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 &&
395 sk->sk_state != BT_CONFIG)
396 return -ENOTCONN;
397
398 memset(la, 0, sizeof(struct sockaddr_l2));
399 addr->sa_family = AF_BLUETOOTH;
400
401 la->l2_psm = chan->psm;
402
403 if (peer) {
404 bacpy(&la->l2_bdaddr, &chan->dst);
405 la->l2_cid = cpu_to_le16(chan->dcid);
406 la->l2_bdaddr_type = chan->dst_type;
407 } else {
408 bacpy(&la->l2_bdaddr, &chan->src);
409 la->l2_cid = cpu_to_le16(chan->scid);
410 la->l2_bdaddr_type = chan->src_type;
411 }
412
413 return sizeof(struct sockaddr_l2);
414}
415
416static int l2cap_get_mode(struct l2cap_chan *chan)
417{
418 switch (chan->mode) {
419 case L2CAP_MODE_BASIC:
420 return BT_MODE_BASIC;
421 case L2CAP_MODE_ERTM:
422 return BT_MODE_ERTM;
423 case L2CAP_MODE_STREAMING:
424 return BT_MODE_STREAMING;
425 case L2CAP_MODE_LE_FLOWCTL:
426 return BT_MODE_LE_FLOWCTL;
427 case L2CAP_MODE_EXT_FLOWCTL:
428 return BT_MODE_EXT_FLOWCTL;
429 }
430
431 return -EINVAL;
432}
433
434static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
435 char __user *optval, int __user *optlen)
436{
437 struct sock *sk = sock->sk;
438 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
439 struct l2cap_options opts;
440 struct l2cap_conninfo cinfo;
441 int len, err = 0;
442 u32 opt;
443
444 BT_DBG("sk %p", sk);
445
446 if (get_user(len, optlen))
447 return -EFAULT;
448
449 lock_sock(sk);
450
451 switch (optname) {
452 case L2CAP_OPTIONS:
453 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
454 * legacy ATT code depends on getsockopt for
455 * L2CAP_OPTIONS we need to let this pass.
456 */
457 if (bdaddr_type_is_le(chan->src_type) &&
458 chan->scid != L2CAP_CID_ATT) {
459 err = -EINVAL;
460 break;
461 }
462
463 /* Only BR/EDR modes are supported here */
464 switch (chan->mode) {
465 case L2CAP_MODE_BASIC:
466 case L2CAP_MODE_ERTM:
467 case L2CAP_MODE_STREAMING:
468 break;
469 default:
470 err = -EINVAL;
471 break;
472 }
473
474 if (err < 0)
475 break;
476
477 memset(&opts, 0, sizeof(opts));
478 opts.imtu = chan->imtu;
479 opts.omtu = chan->omtu;
480 opts.flush_to = chan->flush_to;
481 opts.mode = chan->mode;
482 opts.fcs = chan->fcs;
483 opts.max_tx = chan->max_tx;
484 opts.txwin_size = chan->tx_win;
485
486 BT_DBG("mode 0x%2.2x", chan->mode);
487
488 len = min_t(unsigned int, len, sizeof(opts));
489 if (copy_to_user(optval, (char *) &opts, len))
490 err = -EFAULT;
491
492 break;
493
494 case L2CAP_LM:
495 switch (chan->sec_level) {
496 case BT_SECURITY_LOW:
497 opt = L2CAP_LM_AUTH;
498 break;
499 case BT_SECURITY_MEDIUM:
500 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
501 break;
502 case BT_SECURITY_HIGH:
503 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
504 L2CAP_LM_SECURE;
505 break;
506 case BT_SECURITY_FIPS:
507 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
508 L2CAP_LM_SECURE | L2CAP_LM_FIPS;
509 break;
510 default:
511 opt = 0;
512 break;
513 }
514
515 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
516 opt |= L2CAP_LM_MASTER;
517
518 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
519 opt |= L2CAP_LM_RELIABLE;
520
521 if (put_user(opt, (u32 __user *) optval))
522 err = -EFAULT;
523
524 break;
525
526 case L2CAP_CONNINFO:
527 if (sk->sk_state != BT_CONNECTED &&
528 !(sk->sk_state == BT_CONNECT2 &&
529 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
530 err = -ENOTCONN;
531 break;
532 }
533
534 memset(&cinfo, 0, sizeof(cinfo));
535 cinfo.hci_handle = chan->conn->hcon->handle;
536 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
537
538 len = min_t(unsigned int, len, sizeof(cinfo));
539 if (copy_to_user(optval, (char *) &cinfo, len))
540 err = -EFAULT;
541
542 break;
543
544 default:
545 err = -ENOPROTOOPT;
546 break;
547 }
548
549 release_sock(sk);
550 return err;
551}
552
553static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
554 char __user *optval, int __user *optlen)
555{
556 struct sock *sk = sock->sk;
557 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
558 struct bt_security sec;
559 struct bt_power pwr;
560 u32 phys;
561 int len, mode, err = 0;
562
563 BT_DBG("sk %p", sk);
564
565 if (level == SOL_L2CAP)
566 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
567
568 if (level != SOL_BLUETOOTH)
569 return -ENOPROTOOPT;
570
571 if (get_user(len, optlen))
572 return -EFAULT;
573
574 lock_sock(sk);
575
576 switch (optname) {
577 case BT_SECURITY:
578 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
579 chan->chan_type != L2CAP_CHAN_FIXED &&
580 chan->chan_type != L2CAP_CHAN_RAW) {
581 err = -EINVAL;
582 break;
583 }
584
585 memset(&sec, 0, sizeof(sec));
586 if (chan->conn) {
587 sec.level = chan->conn->hcon->sec_level;
588
589 if (sk->sk_state == BT_CONNECTED)
590 sec.key_size = chan->conn->hcon->enc_key_size;
591 } else {
592 sec.level = chan->sec_level;
593 }
594
595 len = min_t(unsigned int, len, sizeof(sec));
596 if (copy_to_user(optval, (char *) &sec, len))
597 err = -EFAULT;
598
599 break;
600
601 case BT_DEFER_SETUP:
602 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
603 err = -EINVAL;
604 break;
605 }
606
607 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
608 (u32 __user *) optval))
609 err = -EFAULT;
610
611 break;
612
613 case BT_FLUSHABLE:
614 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
615 (u32 __user *) optval))
616 err = -EFAULT;
617
618 break;
619
620 case BT_POWER:
621 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
622 && sk->sk_type != SOCK_RAW) {
623 err = -EINVAL;
624 break;
625 }
626
627 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
628
629 len = min_t(unsigned int, len, sizeof(pwr));
630 if (copy_to_user(optval, (char *) &pwr, len))
631 err = -EFAULT;
632
633 break;
634
635 case BT_CHANNEL_POLICY:
636 if (put_user(chan->chan_policy, (u32 __user *) optval))
637 err = -EFAULT;
638 break;
639
640 case BT_SNDMTU:
641 if (!bdaddr_type_is_le(chan->src_type)) {
642 err = -EINVAL;
643 break;
644 }
645
646 if (sk->sk_state != BT_CONNECTED) {
647 err = -ENOTCONN;
648 break;
649 }
650
651 if (put_user(chan->omtu, (u16 __user *) optval))
652 err = -EFAULT;
653 break;
654
655 case BT_RCVMTU:
656 if (!bdaddr_type_is_le(chan->src_type)) {
657 err = -EINVAL;
658 break;
659 }
660
661 if (put_user(chan->imtu, (u16 __user *) optval))
662 err = -EFAULT;
663 break;
664
665 case BT_PHY:
666 if (sk->sk_state != BT_CONNECTED) {
667 err = -ENOTCONN;
668 break;
669 }
670
671 phys = hci_conn_get_phy(chan->conn->hcon);
672
673 if (put_user(phys, (u32 __user *) optval))
674 err = -EFAULT;
675 break;
676
677 case BT_MODE:
678 if (!enable_ecred) {
679 err = -ENOPROTOOPT;
680 break;
681 }
682
683 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
684 err = -EINVAL;
685 break;
686 }
687
688 mode = l2cap_get_mode(chan);
689 if (mode < 0) {
690 err = mode;
691 break;
692 }
693
694 if (put_user(mode, (u8 __user *) optval))
695 err = -EFAULT;
696 break;
697
698 default:
699 err = -ENOPROTOOPT;
700 break;
701 }
702
703 release_sock(sk);
704 return err;
705}
706
707static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
708{
709 switch (chan->scid) {
710 case L2CAP_CID_ATT:
711 if (mtu < L2CAP_LE_MIN_MTU)
712 return false;
713 break;
714
715 default:
716 if (mtu < L2CAP_DEFAULT_MIN_MTU)
717 return false;
718 }
719
720 return true;
721}
722
723static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
724 sockptr_t optval, unsigned int optlen)
725{
726 struct sock *sk = sock->sk;
727 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
728 struct l2cap_options opts;
729 int len, err = 0;
730 u32 opt;
731
732 BT_DBG("sk %p", sk);
733
734 lock_sock(sk);
735
736 switch (optname) {
737 case L2CAP_OPTIONS:
738 if (bdaddr_type_is_le(chan->src_type)) {
739 err = -EINVAL;
740 break;
741 }
742
743 if (sk->sk_state == BT_CONNECTED) {
744 err = -EINVAL;
745 break;
746 }
747
748 opts.imtu = chan->imtu;
749 opts.omtu = chan->omtu;
750 opts.flush_to = chan->flush_to;
751 opts.mode = chan->mode;
752 opts.fcs = chan->fcs;
753 opts.max_tx = chan->max_tx;
754 opts.txwin_size = chan->tx_win;
755
756 len = min_t(unsigned int, sizeof(opts), optlen);
757 if (copy_from_sockptr(&opts, optval, len)) {
758 err = -EFAULT;
759 break;
760 }
761
762 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
763 err = -EINVAL;
764 break;
765 }
766
767 if (!l2cap_valid_mtu(chan, opts.imtu)) {
768 err = -EINVAL;
769 break;
770 }
771
772 /* Only BR/EDR modes are supported here */
773 switch (opts.mode) {
774 case L2CAP_MODE_BASIC:
775 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
776 break;
777 case L2CAP_MODE_ERTM:
778 case L2CAP_MODE_STREAMING:
779 if (!disable_ertm)
780 break;
781 fallthrough;
782 default:
783 err = -EINVAL;
784 break;
785 }
786
787 if (err < 0)
788 break;
789
790 chan->mode = opts.mode;
791
792 BT_DBG("mode 0x%2.2x", chan->mode);
793
794 chan->imtu = opts.imtu;
795 chan->omtu = opts.omtu;
796 chan->fcs = opts.fcs;
797 chan->max_tx = opts.max_tx;
798 chan->tx_win = opts.txwin_size;
799 chan->flush_to = opts.flush_to;
800 break;
801
802 case L2CAP_LM:
803 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
804 err = -EFAULT;
805 break;
806 }
807
808 if (opt & L2CAP_LM_FIPS) {
809 err = -EINVAL;
810 break;
811 }
812
813 if (opt & L2CAP_LM_AUTH)
814 chan->sec_level = BT_SECURITY_LOW;
815 if (opt & L2CAP_LM_ENCRYPT)
816 chan->sec_level = BT_SECURITY_MEDIUM;
817 if (opt & L2CAP_LM_SECURE)
818 chan->sec_level = BT_SECURITY_HIGH;
819
820 if (opt & L2CAP_LM_MASTER)
821 set_bit(FLAG_ROLE_SWITCH, &chan->flags);
822 else
823 clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
824
825 if (opt & L2CAP_LM_RELIABLE)
826 set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
827 else
828 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
829 break;
830
831 default:
832 err = -ENOPROTOOPT;
833 break;
834 }
835
836 release_sock(sk);
837 return err;
838}
839
840static int l2cap_set_mode(struct l2cap_chan *chan, u8 mode)
841{
842 switch (mode) {
843 case BT_MODE_BASIC:
844 if (bdaddr_type_is_le(chan->src_type))
845 return -EINVAL;
846 mode = L2CAP_MODE_BASIC;
847 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
848 break;
849 case BT_MODE_ERTM:
850 if (!disable_ertm || bdaddr_type_is_le(chan->src_type))
851 return -EINVAL;
852 mode = L2CAP_MODE_ERTM;
853 break;
854 case BT_MODE_STREAMING:
855 if (!disable_ertm || bdaddr_type_is_le(chan->src_type))
856 return -EINVAL;
857 mode = L2CAP_MODE_STREAMING;
858 break;
859 case BT_MODE_LE_FLOWCTL:
860 if (!bdaddr_type_is_le(chan->src_type))
861 return -EINVAL;
862 mode = L2CAP_MODE_LE_FLOWCTL;
863 break;
864 case BT_MODE_EXT_FLOWCTL:
865 /* TODO: Add support for ECRED PDUs to BR/EDR */
866 if (!bdaddr_type_is_le(chan->src_type))
867 return -EINVAL;
868 mode = L2CAP_MODE_EXT_FLOWCTL;
869 break;
870 default:
871 return -EINVAL;
872 }
873
874 chan->mode = mode;
875
876 return 0;
877}
878
879static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
880 sockptr_t optval, unsigned int optlen)
881{
882 struct sock *sk = sock->sk;
883 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
884 struct bt_security sec;
885 struct bt_power pwr;
886 struct l2cap_conn *conn;
887 int len, err = 0;
888 u32 opt;
889 u16 mtu;
890 u8 mode;
891
892 BT_DBG("sk %p", sk);
893
894 if (level == SOL_L2CAP)
895 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
896
897 if (level != SOL_BLUETOOTH)
898 return -ENOPROTOOPT;
899
900 lock_sock(sk);
901
902 switch (optname) {
903 case BT_SECURITY:
904 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
905 chan->chan_type != L2CAP_CHAN_FIXED &&
906 chan->chan_type != L2CAP_CHAN_RAW) {
907 err = -EINVAL;
908 break;
909 }
910
911 sec.level = BT_SECURITY_LOW;
912
913 len = min_t(unsigned int, sizeof(sec), optlen);
914 if (copy_from_sockptr(&sec, optval, len)) {
915 err = -EFAULT;
916 break;
917 }
918
919 if (sec.level < BT_SECURITY_LOW ||
920 sec.level > BT_SECURITY_FIPS) {
921 err = -EINVAL;
922 break;
923 }
924
925 chan->sec_level = sec.level;
926
927 if (!chan->conn)
928 break;
929
930 conn = chan->conn;
931
932 /* change security for LE channels */
933 if (chan->scid == L2CAP_CID_ATT) {
934 if (smp_conn_security(conn->hcon, sec.level)) {
935 err = -EINVAL;
936 break;
937 }
938
939 set_bit(FLAG_PENDING_SECURITY, &chan->flags);
940 sk->sk_state = BT_CONFIG;
941 chan->state = BT_CONFIG;
942
943 /* or for ACL link */
944 } else if ((sk->sk_state == BT_CONNECT2 &&
945 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
946 sk->sk_state == BT_CONNECTED) {
947 if (!l2cap_chan_check_security(chan, true))
948 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
949 else
950 sk->sk_state_change(sk);
951 } else {
952 err = -EINVAL;
953 }
954 break;
955
956 case BT_DEFER_SETUP:
957 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
958 err = -EINVAL;
959 break;
960 }
961
962 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
963 err = -EFAULT;
964 break;
965 }
966
967 if (opt) {
968 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
969 set_bit(FLAG_DEFER_SETUP, &chan->flags);
970 } else {
971 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
972 clear_bit(FLAG_DEFER_SETUP, &chan->flags);
973 }
974 break;
975
976 case BT_FLUSHABLE:
977 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
978 err = -EFAULT;
979 break;
980 }
981
982 if (opt > BT_FLUSHABLE_ON) {
983 err = -EINVAL;
984 break;
985 }
986
987 if (opt == BT_FLUSHABLE_OFF) {
988 conn = chan->conn;
989 /* proceed further only when we have l2cap_conn and
990 No Flush support in the LM */
991 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
992 err = -EINVAL;
993 break;
994 }
995 }
996
997 if (opt)
998 set_bit(FLAG_FLUSHABLE, &chan->flags);
999 else
1000 clear_bit(FLAG_FLUSHABLE, &chan->flags);
1001 break;
1002
1003 case BT_POWER:
1004 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
1005 chan->chan_type != L2CAP_CHAN_RAW) {
1006 err = -EINVAL;
1007 break;
1008 }
1009
1010 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
1011
1012 len = min_t(unsigned int, sizeof(pwr), optlen);
1013 if (copy_from_sockptr(&pwr, optval, len)) {
1014 err = -EFAULT;
1015 break;
1016 }
1017
1018 if (pwr.force_active)
1019 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1020 else
1021 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1022 break;
1023
1024 case BT_CHANNEL_POLICY:
1025 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
1026 err = -EFAULT;
1027 break;
1028 }
1029
1030 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
1031 err = -EINVAL;
1032 break;
1033 }
1034
1035 if (chan->mode != L2CAP_MODE_ERTM &&
1036 chan->mode != L2CAP_MODE_STREAMING) {
1037 err = -EOPNOTSUPP;
1038 break;
1039 }
1040
1041 chan->chan_policy = (u8) opt;
1042
1043 if (sk->sk_state == BT_CONNECTED &&
1044 chan->move_role == L2CAP_MOVE_ROLE_NONE)
1045 l2cap_move_start(chan);
1046
1047 break;
1048
1049 case BT_SNDMTU:
1050 if (!bdaddr_type_is_le(chan->src_type)) {
1051 err = -EINVAL;
1052 break;
1053 }
1054
1055 /* Setting is not supported as it's the remote side that
1056 * decides this.
1057 */
1058 err = -EPERM;
1059 break;
1060
1061 case BT_RCVMTU:
1062 if (!bdaddr_type_is_le(chan->src_type)) {
1063 err = -EINVAL;
1064 break;
1065 }
1066
1067 if (chan->mode == L2CAP_MODE_LE_FLOWCTL &&
1068 sk->sk_state == BT_CONNECTED) {
1069 err = -EISCONN;
1070 break;
1071 }
1072
1073 if (copy_from_sockptr(&mtu, optval, sizeof(u16))) {
1074 err = -EFAULT;
1075 break;
1076 }
1077
1078 if (chan->mode == L2CAP_MODE_EXT_FLOWCTL &&
1079 sk->sk_state == BT_CONNECTED)
1080 err = l2cap_chan_reconfigure(chan, mtu);
1081 else
1082 chan->imtu = mtu;
1083
1084 break;
1085
1086 case BT_MODE:
1087 if (!enable_ecred) {
1088 err = -ENOPROTOOPT;
1089 break;
1090 }
1091
1092 BT_DBG("sk->sk_state %u", sk->sk_state);
1093
1094 if (sk->sk_state != BT_BOUND) {
1095 err = -EINVAL;
1096 break;
1097 }
1098
1099 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1100 err = -EINVAL;
1101 break;
1102 }
1103
1104 if (copy_from_sockptr(&mode, optval, sizeof(u8))) {
1105 err = -EFAULT;
1106 break;
1107 }
1108
1109 BT_DBG("mode %u", mode);
1110
1111 err = l2cap_set_mode(chan, mode);
1112 if (err)
1113 break;
1114
1115 BT_DBG("mode 0x%2.2x", chan->mode);
1116
1117 break;
1118
1119 default:
1120 err = -ENOPROTOOPT;
1121 break;
1122 }
1123
1124 release_sock(sk);
1125 return err;
1126}
1127
1128static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1129 size_t len)
1130{
1131 struct sock *sk = sock->sk;
1132 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1133 int err;
1134
1135 BT_DBG("sock %p, sk %p", sock, sk);
1136
1137 err = sock_error(sk);
1138 if (err)
1139 return err;
1140
1141 if (msg->msg_flags & MSG_OOB)
1142 return -EOPNOTSUPP;
1143
1144 if (sk->sk_state != BT_CONNECTED)
1145 return -ENOTCONN;
1146
1147 lock_sock(sk);
1148 err = bt_sock_wait_ready(sk, msg->msg_flags);
1149 release_sock(sk);
1150 if (err)
1151 return err;
1152
1153 l2cap_chan_lock(chan);
1154 err = l2cap_chan_send(chan, msg, len);
1155 l2cap_chan_unlock(chan);
1156
1157 return err;
1158}
1159
1160static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1161 size_t len, int flags)
1162{
1163 struct sock *sk = sock->sk;
1164 struct l2cap_pinfo *pi = l2cap_pi(sk);
1165 int err;
1166
1167 lock_sock(sk);
1168
1169 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
1170 &bt_sk(sk)->flags)) {
1171 if (pi->chan->mode == L2CAP_MODE_EXT_FLOWCTL) {
1172 sk->sk_state = BT_CONNECTED;
1173 pi->chan->state = BT_CONNECTED;
1174 __l2cap_ecred_conn_rsp_defer(pi->chan);
1175 } else if (bdaddr_type_is_le(pi->chan->src_type)) {
1176 sk->sk_state = BT_CONNECTED;
1177 pi->chan->state = BT_CONNECTED;
1178 __l2cap_le_connect_rsp_defer(pi->chan);
1179 } else {
1180 sk->sk_state = BT_CONFIG;
1181 pi->chan->state = BT_CONFIG;
1182 __l2cap_connect_rsp_defer(pi->chan);
1183 }
1184
1185 err = 0;
1186 goto done;
1187 }
1188
1189 release_sock(sk);
1190
1191 if (sock->type == SOCK_STREAM)
1192 err = bt_sock_stream_recvmsg(sock, msg, len, flags);
1193 else
1194 err = bt_sock_recvmsg(sock, msg, len, flags);
1195
1196 if (pi->chan->mode != L2CAP_MODE_ERTM)
1197 return err;
1198
1199 /* Attempt to put pending rx data in the socket buffer */
1200
1201 lock_sock(sk);
1202
1203 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
1204 goto done;
1205
1206 if (pi->rx_busy_skb) {
1207 if (!__sock_queue_rcv_skb(sk, pi->rx_busy_skb))
1208 pi->rx_busy_skb = NULL;
1209 else
1210 goto done;
1211 }
1212
1213 /* Restore data flow when half of the receive buffer is
1214 * available. This avoids resending large numbers of
1215 * frames.
1216 */
1217 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1218 l2cap_chan_busy(pi->chan, 0);
1219
1220done:
1221 release_sock(sk);
1222 return err;
1223}
1224
1225/* Kill socket (only if zapped and orphan)
1226 * Must be called on unlocked socket, with l2cap channel lock.
1227 */
1228static void l2cap_sock_kill(struct sock *sk)
1229{
1230 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1231 return;
1232
1233 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
1234
1235 /* Kill poor orphan */
1236
1237 l2cap_chan_put(l2cap_pi(sk)->chan);
1238 sock_set_flag(sk, SOCK_DEAD);
1239 sock_put(sk);
1240}
1241
1242static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
1243{
1244 DECLARE_WAITQUEUE(wait, current);
1245 int err = 0;
1246 int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1247 /* Timeout to prevent infinite loop */
1248 unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
1249
1250 add_wait_queue(sk_sleep(sk), &wait);
1251 set_current_state(TASK_INTERRUPTIBLE);
1252 do {
1253 BT_DBG("Waiting for %d ACKs, timeout %04d ms",
1254 chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
1255 jiffies_to_msecs(timeout - jiffies));
1256
1257 if (!timeo)
1258 timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1259
1260 if (signal_pending(current)) {
1261 err = sock_intr_errno(timeo);
1262 break;
1263 }
1264
1265 release_sock(sk);
1266 timeo = schedule_timeout(timeo);
1267 lock_sock(sk);
1268 set_current_state(TASK_INTERRUPTIBLE);
1269
1270 err = sock_error(sk);
1271 if (err)
1272 break;
1273
1274 if (time_after(jiffies, timeout)) {
1275 err = -ENOLINK;
1276 break;
1277 }
1278
1279 } while (chan->unacked_frames > 0 &&
1280 chan->state == BT_CONNECTED);
1281
1282 set_current_state(TASK_RUNNING);
1283 remove_wait_queue(sk_sleep(sk), &wait);
1284 return err;
1285}
1286
1287static int l2cap_sock_shutdown(struct socket *sock, int how)
1288{
1289 struct sock *sk = sock->sk;
1290 struct l2cap_chan *chan;
1291 struct l2cap_conn *conn;
1292 int err = 0;
1293
1294 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1295
1296 /* 'how' parameter is mapped to sk_shutdown as follows:
1297 * SHUT_RD (0) --> RCV_SHUTDOWN (1)
1298 * SHUT_WR (1) --> SEND_SHUTDOWN (2)
1299 * SHUT_RDWR (2) --> SHUTDOWN_MASK (3)
1300 */
1301 how++;
1302
1303 if (!sk)
1304 return 0;
1305
1306 lock_sock(sk);
1307
1308 if ((sk->sk_shutdown & how) == how)
1309 goto shutdown_already;
1310
1311 BT_DBG("Handling sock shutdown");
1312
1313 /* prevent sk structure from being freed whilst unlocked */
1314 sock_hold(sk);
1315
1316 chan = l2cap_pi(sk)->chan;
1317 /* prevent chan structure from being freed whilst unlocked */
1318 l2cap_chan_hold(chan);
1319
1320 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1321
1322 if (chan->mode == L2CAP_MODE_ERTM &&
1323 chan->unacked_frames > 0 &&
1324 chan->state == BT_CONNECTED) {
1325 err = __l2cap_wait_ack(sk, chan);
1326
1327 /* After waiting for ACKs, check whether shutdown
1328 * has already been actioned to close the L2CAP
1329 * link such as by l2cap_disconnection_req().
1330 */
1331 if ((sk->sk_shutdown & how) == how)
1332 goto shutdown_matched;
1333 }
1334
1335 /* Try setting the RCV_SHUTDOWN bit, return early if SEND_SHUTDOWN
1336 * is already set
1337 */
1338 if ((how & RCV_SHUTDOWN) && !(sk->sk_shutdown & RCV_SHUTDOWN)) {
1339 sk->sk_shutdown |= RCV_SHUTDOWN;
1340 if ((sk->sk_shutdown & how) == how)
1341 goto shutdown_matched;
1342 }
1343
1344 sk->sk_shutdown |= SEND_SHUTDOWN;
1345 release_sock(sk);
1346
1347 l2cap_chan_lock(chan);
1348 conn = chan->conn;
1349 if (conn)
1350 /* prevent conn structure from being freed */
1351 l2cap_conn_get(conn);
1352 l2cap_chan_unlock(chan);
1353
1354 if (conn)
1355 /* mutex lock must be taken before l2cap_chan_lock() */
1356 mutex_lock(&conn->chan_lock);
1357
1358 l2cap_chan_lock(chan);
1359 l2cap_chan_close(chan, 0);
1360 l2cap_chan_unlock(chan);
1361
1362 if (conn) {
1363 mutex_unlock(&conn->chan_lock);
1364 l2cap_conn_put(conn);
1365 }
1366
1367 lock_sock(sk);
1368
1369 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1370 !(current->flags & PF_EXITING))
1371 err = bt_sock_wait_state(sk, BT_CLOSED,
1372 sk->sk_lingertime);
1373
1374shutdown_matched:
1375 l2cap_chan_put(chan);
1376 sock_put(sk);
1377
1378shutdown_already:
1379 if (!err && sk->sk_err)
1380 err = -sk->sk_err;
1381
1382 release_sock(sk);
1383
1384 BT_DBG("Sock shutdown complete err: %d", err);
1385
1386 return err;
1387}
1388
1389static int l2cap_sock_release(struct socket *sock)
1390{
1391 struct sock *sk = sock->sk;
1392 int err;
1393 struct l2cap_chan *chan;
1394
1395 BT_DBG("sock %p, sk %p", sock, sk);
1396
1397 if (!sk)
1398 return 0;
1399
1400 l2cap_sock_cleanup_listen(sk);
1401 bt_sock_unlink(&l2cap_sk_list, sk);
1402
1403 err = l2cap_sock_shutdown(sock, SHUT_RDWR);
1404 chan = l2cap_pi(sk)->chan;
1405
1406 l2cap_chan_hold(chan);
1407 l2cap_chan_lock(chan);
1408
1409 sock_orphan(sk);
1410 l2cap_sock_kill(sk);
1411
1412 l2cap_chan_unlock(chan);
1413 l2cap_chan_put(chan);
1414
1415 return err;
1416}
1417
1418static void l2cap_sock_cleanup_listen(struct sock *parent)
1419{
1420 struct sock *sk;
1421
1422 BT_DBG("parent %p state %s", parent,
1423 state_to_string(parent->sk_state));
1424
1425 /* Close not yet accepted channels */
1426 while ((sk = bt_accept_dequeue(parent, NULL))) {
1427 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1428
1429 BT_DBG("child chan %p state %s", chan,
1430 state_to_string(chan->state));
1431
1432 l2cap_chan_hold(chan);
1433 l2cap_chan_lock(chan);
1434
1435 __clear_chan_timer(chan);
1436 l2cap_chan_close(chan, ECONNRESET);
1437 l2cap_sock_kill(sk);
1438
1439 l2cap_chan_unlock(chan);
1440 l2cap_chan_put(chan);
1441 }
1442}
1443
1444static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1445{
1446 struct sock *sk, *parent = chan->data;
1447
1448 lock_sock(parent);
1449
1450 /* Check for backlog size */
1451 if (sk_acceptq_is_full(parent)) {
1452 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1453 release_sock(parent);
1454 return NULL;
1455 }
1456
1457 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1458 GFP_ATOMIC, 0);
1459 if (!sk) {
1460 release_sock(parent);
1461 return NULL;
1462 }
1463
1464 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1465
1466 l2cap_sock_init(sk, parent);
1467
1468 bt_accept_enqueue(parent, sk, false);
1469
1470 release_sock(parent);
1471
1472 return l2cap_pi(sk)->chan;
1473}
1474
1475static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1476{
1477 struct sock *sk = chan->data;
1478 int err;
1479
1480 lock_sock(sk);
1481
1482 if (l2cap_pi(sk)->rx_busy_skb) {
1483 err = -ENOMEM;
1484 goto done;
1485 }
1486
1487 if (chan->mode != L2CAP_MODE_ERTM &&
1488 chan->mode != L2CAP_MODE_STREAMING) {
1489 /* Even if no filter is attached, we could potentially
1490 * get errors from security modules, etc.
1491 */
1492 err = sk_filter(sk, skb);
1493 if (err)
1494 goto done;
1495 }
1496
1497 err = __sock_queue_rcv_skb(sk, skb);
1498
1499 /* For ERTM, handle one skb that doesn't fit into the recv
1500 * buffer. This is important to do because the data frames
1501 * have already been acked, so the skb cannot be discarded.
1502 *
1503 * Notify the l2cap core that the buffer is full, so the
1504 * LOCAL_BUSY state is entered and no more frames are
1505 * acked and reassembled until there is buffer space
1506 * available.
1507 */
1508 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1509 l2cap_pi(sk)->rx_busy_skb = skb;
1510 l2cap_chan_busy(chan, 1);
1511 err = 0;
1512 }
1513
1514done:
1515 release_sock(sk);
1516
1517 return err;
1518}
1519
1520static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1521{
1522 struct sock *sk = chan->data;
1523
1524 if (!sk)
1525 return;
1526
1527 l2cap_sock_kill(sk);
1528}
1529
1530static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1531{
1532 struct sock *sk = chan->data;
1533 struct sock *parent;
1534
1535 if (!sk)
1536 return;
1537
1538 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1539
1540 /* This callback can be called both for server (BT_LISTEN)
1541 * sockets as well as "normal" ones. To avoid lockdep warnings
1542 * with child socket locking (through l2cap_sock_cleanup_listen)
1543 * we need separation into separate nesting levels. The simplest
1544 * way to accomplish this is to inherit the nesting level used
1545 * for the channel.
1546 */
1547 lock_sock_nested(sk, atomic_read(&chan->nesting));
1548
1549 parent = bt_sk(sk)->parent;
1550
1551 switch (chan->state) {
1552 case BT_OPEN:
1553 case BT_BOUND:
1554 case BT_CLOSED:
1555 break;
1556 case BT_LISTEN:
1557 l2cap_sock_cleanup_listen(sk);
1558 sk->sk_state = BT_CLOSED;
1559 chan->state = BT_CLOSED;
1560
1561 break;
1562 default:
1563 sk->sk_state = BT_CLOSED;
1564 chan->state = BT_CLOSED;
1565
1566 sk->sk_err = err;
1567
1568 if (parent) {
1569 bt_accept_unlink(sk);
1570 parent->sk_data_ready(parent);
1571 } else {
1572 sk->sk_state_change(sk);
1573 }
1574
1575 break;
1576 }
1577 release_sock(sk);
1578
1579 /* Only zap after cleanup to avoid use after free race */
1580 sock_set_flag(sk, SOCK_ZAPPED);
1581
1582}
1583
1584static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1585 int err)
1586{
1587 struct sock *sk = chan->data;
1588
1589 sk->sk_state = state;
1590
1591 if (err)
1592 sk->sk_err = err;
1593}
1594
1595static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1596 unsigned long hdr_len,
1597 unsigned long len, int nb)
1598{
1599 struct sock *sk = chan->data;
1600 struct sk_buff *skb;
1601 int err;
1602
1603 l2cap_chan_unlock(chan);
1604 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1605 l2cap_chan_lock(chan);
1606
1607 if (!skb)
1608 return ERR_PTR(err);
1609
1610 /* Channel lock is released before requesting new skb and then
1611 * reacquired thus we need to recheck channel state.
1612 */
1613 if (chan->state != BT_CONNECTED) {
1614 kfree_skb(skb);
1615 return ERR_PTR(-ENOTCONN);
1616 }
1617
1618 skb->priority = READ_ONCE(sk->sk_priority);
1619
1620 bt_cb(skb)->l2cap.chan = chan;
1621
1622 return skb;
1623}
1624
1625static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1626{
1627 struct sock *sk = chan->data;
1628 struct sock *parent;
1629
1630 lock_sock(sk);
1631
1632 parent = bt_sk(sk)->parent;
1633
1634 BT_DBG("sk %p, parent %p", sk, parent);
1635
1636 sk->sk_state = BT_CONNECTED;
1637 sk->sk_state_change(sk);
1638
1639 if (parent)
1640 parent->sk_data_ready(parent);
1641
1642 release_sock(sk);
1643}
1644
1645static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1646{
1647 struct sock *parent, *sk = chan->data;
1648
1649 lock_sock(sk);
1650
1651 parent = bt_sk(sk)->parent;
1652 if (parent)
1653 parent->sk_data_ready(parent);
1654
1655 release_sock(sk);
1656}
1657
1658static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1659{
1660 struct sock *sk = chan->data;
1661
1662 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1663 sk->sk_state = BT_CONNECTED;
1664 chan->state = BT_CONNECTED;
1665 }
1666
1667 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1668 sk->sk_state_change(sk);
1669}
1670
1671static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1672{
1673 struct sock *sk = chan->data;
1674
1675 lock_sock(sk);
1676 sk->sk_shutdown = SHUTDOWN_MASK;
1677 release_sock(sk);
1678}
1679
1680static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1681{
1682 struct sock *sk = chan->data;
1683
1684 return sk->sk_sndtimeo;
1685}
1686
1687static struct pid *l2cap_sock_get_peer_pid_cb(struct l2cap_chan *chan)
1688{
1689 struct sock *sk = chan->data;
1690
1691 return sk->sk_peer_pid;
1692}
1693
1694static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1695{
1696 struct sock *sk = chan->data;
1697
1698 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1699 sk->sk_state_change(sk);
1700}
1701
1702static int l2cap_sock_filter(struct l2cap_chan *chan, struct sk_buff *skb)
1703{
1704 struct sock *sk = chan->data;
1705
1706 switch (chan->mode) {
1707 case L2CAP_MODE_ERTM:
1708 case L2CAP_MODE_STREAMING:
1709 return sk_filter(sk, skb);
1710 }
1711
1712 return 0;
1713}
1714
1715static const struct l2cap_ops l2cap_chan_ops = {
1716 .name = "L2CAP Socket Interface",
1717 .new_connection = l2cap_sock_new_connection_cb,
1718 .recv = l2cap_sock_recv_cb,
1719 .close = l2cap_sock_close_cb,
1720 .teardown = l2cap_sock_teardown_cb,
1721 .state_change = l2cap_sock_state_change_cb,
1722 .ready = l2cap_sock_ready_cb,
1723 .defer = l2cap_sock_defer_cb,
1724 .resume = l2cap_sock_resume_cb,
1725 .suspend = l2cap_sock_suspend_cb,
1726 .set_shutdown = l2cap_sock_set_shutdown_cb,
1727 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1728 .get_peer_pid = l2cap_sock_get_peer_pid_cb,
1729 .alloc_skb = l2cap_sock_alloc_skb_cb,
1730 .filter = l2cap_sock_filter,
1731};
1732
1733static void l2cap_sock_destruct(struct sock *sk)
1734{
1735 BT_DBG("sk %p", sk);
1736
1737 if (l2cap_pi(sk)->chan) {
1738 l2cap_pi(sk)->chan->data = NULL;
1739 l2cap_chan_put(l2cap_pi(sk)->chan);
1740 }
1741
1742 if (l2cap_pi(sk)->rx_busy_skb) {
1743 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1744 l2cap_pi(sk)->rx_busy_skb = NULL;
1745 }
1746
1747 skb_queue_purge(&sk->sk_receive_queue);
1748 skb_queue_purge(&sk->sk_write_queue);
1749}
1750
1751static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1752 int *msg_namelen)
1753{
1754 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1755
1756 memset(la, 0, sizeof(struct sockaddr_l2));
1757 la->l2_family = AF_BLUETOOTH;
1758 la->l2_psm = bt_cb(skb)->l2cap.psm;
1759 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr);
1760
1761 *msg_namelen = sizeof(struct sockaddr_l2);
1762}
1763
1764static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1765{
1766 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1767
1768 BT_DBG("sk %p", sk);
1769
1770 if (parent) {
1771 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1772
1773 sk->sk_type = parent->sk_type;
1774 bt_sk(sk)->flags = bt_sk(parent)->flags;
1775
1776 chan->chan_type = pchan->chan_type;
1777 chan->imtu = pchan->imtu;
1778 chan->omtu = pchan->omtu;
1779 chan->conf_state = pchan->conf_state;
1780 chan->mode = pchan->mode;
1781 chan->fcs = pchan->fcs;
1782 chan->max_tx = pchan->max_tx;
1783 chan->tx_win = pchan->tx_win;
1784 chan->tx_win_max = pchan->tx_win_max;
1785 chan->sec_level = pchan->sec_level;
1786 chan->flags = pchan->flags;
1787 chan->tx_credits = pchan->tx_credits;
1788 chan->rx_credits = pchan->rx_credits;
1789
1790 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1791 chan->scid = pchan->scid;
1792 chan->dcid = pchan->scid;
1793 }
1794
1795 security_sk_clone(parent, sk);
1796 } else {
1797 switch (sk->sk_type) {
1798 case SOCK_RAW:
1799 chan->chan_type = L2CAP_CHAN_RAW;
1800 break;
1801 case SOCK_DGRAM:
1802 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1803 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1804 break;
1805 case SOCK_SEQPACKET:
1806 case SOCK_STREAM:
1807 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1808 break;
1809 }
1810
1811 chan->imtu = L2CAP_DEFAULT_MTU;
1812 chan->omtu = 0;
1813 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1814 chan->mode = L2CAP_MODE_ERTM;
1815 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1816 } else {
1817 chan->mode = L2CAP_MODE_BASIC;
1818 }
1819
1820 l2cap_chan_set_defaults(chan);
1821 }
1822
1823 /* Default config options */
1824 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1825
1826 chan->data = sk;
1827 chan->ops = &l2cap_chan_ops;
1828}
1829
1830static struct proto l2cap_proto = {
1831 .name = "L2CAP",
1832 .owner = THIS_MODULE,
1833 .obj_size = sizeof(struct l2cap_pinfo)
1834};
1835
1836static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1837 int proto, gfp_t prio, int kern)
1838{
1839 struct sock *sk;
1840 struct l2cap_chan *chan;
1841
1842 sk = bt_sock_alloc(net, sock, &l2cap_proto, proto, prio, kern);
1843 if (!sk)
1844 return NULL;
1845
1846 sk->sk_destruct = l2cap_sock_destruct;
1847 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1848
1849 chan = l2cap_chan_create();
1850 if (!chan) {
1851 sk_free(sk);
1852 return NULL;
1853 }
1854
1855 l2cap_chan_hold(chan);
1856
1857 l2cap_pi(sk)->chan = chan;
1858
1859 return sk;
1860}
1861
1862static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1863 int kern)
1864{
1865 struct sock *sk;
1866
1867 BT_DBG("sock %p", sock);
1868
1869 sock->state = SS_UNCONNECTED;
1870
1871 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1872 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1873 return -ESOCKTNOSUPPORT;
1874
1875 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1876 return -EPERM;
1877
1878 sock->ops = &l2cap_sock_ops;
1879
1880 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
1881 if (!sk)
1882 return -ENOMEM;
1883
1884 l2cap_sock_init(sk, NULL);
1885 bt_sock_link(&l2cap_sk_list, sk);
1886 return 0;
1887}
1888
1889static const struct proto_ops l2cap_sock_ops = {
1890 .family = PF_BLUETOOTH,
1891 .owner = THIS_MODULE,
1892 .release = l2cap_sock_release,
1893 .bind = l2cap_sock_bind,
1894 .connect = l2cap_sock_connect,
1895 .listen = l2cap_sock_listen,
1896 .accept = l2cap_sock_accept,
1897 .getname = l2cap_sock_getname,
1898 .sendmsg = l2cap_sock_sendmsg,
1899 .recvmsg = l2cap_sock_recvmsg,
1900 .poll = bt_sock_poll,
1901 .ioctl = bt_sock_ioctl,
1902 .gettstamp = sock_gettstamp,
1903 .mmap = sock_no_mmap,
1904 .socketpair = sock_no_socketpair,
1905 .shutdown = l2cap_sock_shutdown,
1906 .setsockopt = l2cap_sock_setsockopt,
1907 .getsockopt = l2cap_sock_getsockopt
1908};
1909
1910static const struct net_proto_family l2cap_sock_family_ops = {
1911 .family = PF_BLUETOOTH,
1912 .owner = THIS_MODULE,
1913 .create = l2cap_sock_create,
1914};
1915
1916int __init l2cap_init_sockets(void)
1917{
1918 int err;
1919
1920 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1921
1922 err = proto_register(&l2cap_proto, 0);
1923 if (err < 0)
1924 return err;
1925
1926 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1927 if (err < 0) {
1928 BT_ERR("L2CAP socket registration failed");
1929 goto error;
1930 }
1931
1932 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1933 NULL);
1934 if (err < 0) {
1935 BT_ERR("Failed to create L2CAP proc file");
1936 bt_sock_unregister(BTPROTO_L2CAP);
1937 goto error;
1938 }
1939
1940 BT_INFO("L2CAP socket layer initialized");
1941
1942 return 0;
1943
1944error:
1945 proto_unregister(&l2cap_proto);
1946 return err;
1947}
1948
1949void l2cap_cleanup_sockets(void)
1950{
1951 bt_procfs_cleanup(&init_net, "l2cap");
1952 bt_sock_unregister(BTPROTO_L2CAP);
1953 proto_unregister(&l2cap_proto);
1954}
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 bool zapped;
183
184 BT_DBG("sk %p", sk);
185
186 lock_sock(sk);
187 zapped = sock_flag(sk, SOCK_ZAPPED);
188 release_sock(sk);
189
190 if (zapped)
191 return -EINVAL;
192
193 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
194 addr->sa_family != AF_BLUETOOTH)
195 return -EINVAL;
196
197 memset(&la, 0, sizeof(la));
198 len = min_t(unsigned int, sizeof(la), alen);
199 memcpy(&la, addr, len);
200
201 if (la.l2_cid && la.l2_psm)
202 return -EINVAL;
203
204 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
205 return -EINVAL;
206
207 /* Check that the socket wasn't bound to something that
208 * conflicts with the address given to connect(). If chan->src
209 * is BDADDR_ANY it means bind() was never used, in which case
210 * chan->src_type and la.l2_bdaddr_type do not need to match.
211 */
212 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
213 bdaddr_type_is_le(la.l2_bdaddr_type)) {
214 /* Old user space versions will try to incorrectly bind
215 * the ATT socket using BDADDR_BREDR. We need to accept
216 * this and fix up the source address type only when
217 * both the source CID and destination CID indicate
218 * ATT. Anything else is an invalid combination.
219 */
220 if (chan->scid != L2CAP_CID_ATT ||
221 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
222 return -EINVAL;
223
224 /* We don't have the hdev available here to make a
225 * better decision on random vs public, but since all
226 * user space versions that exhibit this issue anyway do
227 * not support random local addresses assuming public
228 * here is good enough.
229 */
230 chan->src_type = BDADDR_LE_PUBLIC;
231 }
232
233 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
234 return -EINVAL;
235
236 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
237 /* We only allow ATT user space socket */
238 if (la.l2_cid &&
239 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
240 return -EINVAL;
241 }
242
243 if (chan->psm && bdaddr_type_is_le(chan->src_type) && !chan->mode)
244 chan->mode = L2CAP_MODE_LE_FLOWCTL;
245
246 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
247 &la.l2_bdaddr, la.l2_bdaddr_type);
248 if (err)
249 return err;
250
251 lock_sock(sk);
252
253 err = bt_sock_wait_state(sk, BT_CONNECTED,
254 sock_sndtimeo(sk, flags & O_NONBLOCK));
255
256 release_sock(sk);
257
258 return err;
259}
260
261static int l2cap_sock_listen(struct socket *sock, int backlog)
262{
263 struct sock *sk = sock->sk;
264 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
265 int err = 0;
266
267 BT_DBG("sk %p backlog %d", sk, backlog);
268
269 lock_sock(sk);
270
271 if (sk->sk_state != BT_BOUND) {
272 err = -EBADFD;
273 goto done;
274 }
275
276 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
277 err = -EINVAL;
278 goto done;
279 }
280
281 switch (chan->mode) {
282 case L2CAP_MODE_BASIC:
283 case L2CAP_MODE_LE_FLOWCTL:
284 break;
285 case L2CAP_MODE_EXT_FLOWCTL:
286 if (!enable_ecred) {
287 err = -EOPNOTSUPP;
288 goto done;
289 }
290 break;
291 case L2CAP_MODE_ERTM:
292 case L2CAP_MODE_STREAMING:
293 if (!disable_ertm)
294 break;
295 fallthrough;
296 default:
297 err = -EOPNOTSUPP;
298 goto done;
299 }
300
301 sk->sk_max_ack_backlog = backlog;
302 sk->sk_ack_backlog = 0;
303
304 /* Listening channels need to use nested locking in order not to
305 * cause lockdep warnings when the created child channels end up
306 * being locked in the same thread as the parent channel.
307 */
308 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
309
310 chan->state = BT_LISTEN;
311 sk->sk_state = BT_LISTEN;
312
313done:
314 release_sock(sk);
315 return err;
316}
317
318static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
319 int flags, bool kern)
320{
321 DEFINE_WAIT_FUNC(wait, woken_wake_function);
322 struct sock *sk = sock->sk, *nsk;
323 long timeo;
324 int err = 0;
325
326 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
327
328 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
329
330 BT_DBG("sk %p timeo %ld", sk, timeo);
331
332 /* Wait for an incoming connection. (wake-one). */
333 add_wait_queue_exclusive(sk_sleep(sk), &wait);
334 while (1) {
335 if (sk->sk_state != BT_LISTEN) {
336 err = -EBADFD;
337 break;
338 }
339
340 nsk = bt_accept_dequeue(sk, newsock);
341 if (nsk)
342 break;
343
344 if (!timeo) {
345 err = -EAGAIN;
346 break;
347 }
348
349 if (signal_pending(current)) {
350 err = sock_intr_errno(timeo);
351 break;
352 }
353
354 release_sock(sk);
355
356 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
357
358 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
359 }
360 remove_wait_queue(sk_sleep(sk), &wait);
361
362 if (err)
363 goto done;
364
365 newsock->state = SS_CONNECTED;
366
367 BT_DBG("new socket %p", nsk);
368
369done:
370 release_sock(sk);
371 return err;
372}
373
374static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
375 int peer)
376{
377 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
378 struct sock *sk = sock->sk;
379 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
380
381 BT_DBG("sock %p, sk %p", sock, sk);
382
383 if (peer && sk->sk_state != BT_CONNECTED &&
384 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 &&
385 sk->sk_state != BT_CONFIG)
386 return -ENOTCONN;
387
388 memset(la, 0, sizeof(struct sockaddr_l2));
389 addr->sa_family = AF_BLUETOOTH;
390
391 la->l2_psm = chan->psm;
392
393 if (peer) {
394 bacpy(&la->l2_bdaddr, &chan->dst);
395 la->l2_cid = cpu_to_le16(chan->dcid);
396 la->l2_bdaddr_type = chan->dst_type;
397 } else {
398 bacpy(&la->l2_bdaddr, &chan->src);
399 la->l2_cid = cpu_to_le16(chan->scid);
400 la->l2_bdaddr_type = chan->src_type;
401 }
402
403 return sizeof(struct sockaddr_l2);
404}
405
406static int l2cap_get_mode(struct l2cap_chan *chan)
407{
408 switch (chan->mode) {
409 case L2CAP_MODE_BASIC:
410 return BT_MODE_BASIC;
411 case L2CAP_MODE_ERTM:
412 return BT_MODE_ERTM;
413 case L2CAP_MODE_STREAMING:
414 return BT_MODE_STREAMING;
415 case L2CAP_MODE_LE_FLOWCTL:
416 return BT_MODE_LE_FLOWCTL;
417 case L2CAP_MODE_EXT_FLOWCTL:
418 return BT_MODE_EXT_FLOWCTL;
419 }
420
421 return -EINVAL;
422}
423
424static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
425 char __user *optval, int __user *optlen)
426{
427 struct sock *sk = sock->sk;
428 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
429 struct l2cap_options opts;
430 struct l2cap_conninfo cinfo;
431 int len, err = 0;
432 u32 opt;
433
434 BT_DBG("sk %p", sk);
435
436 if (get_user(len, optlen))
437 return -EFAULT;
438
439 lock_sock(sk);
440
441 switch (optname) {
442 case L2CAP_OPTIONS:
443 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
444 * legacy ATT code depends on getsockopt for
445 * L2CAP_OPTIONS we need to let this pass.
446 */
447 if (bdaddr_type_is_le(chan->src_type) &&
448 chan->scid != L2CAP_CID_ATT) {
449 err = -EINVAL;
450 break;
451 }
452
453 /* Only BR/EDR modes are supported here */
454 switch (chan->mode) {
455 case L2CAP_MODE_BASIC:
456 case L2CAP_MODE_ERTM:
457 case L2CAP_MODE_STREAMING:
458 break;
459 default:
460 err = -EINVAL;
461 break;
462 }
463
464 if (err < 0)
465 break;
466
467 memset(&opts, 0, sizeof(opts));
468 opts.imtu = chan->imtu;
469 opts.omtu = chan->omtu;
470 opts.flush_to = chan->flush_to;
471 opts.mode = chan->mode;
472 opts.fcs = chan->fcs;
473 opts.max_tx = chan->max_tx;
474 opts.txwin_size = chan->tx_win;
475
476 BT_DBG("mode 0x%2.2x", chan->mode);
477
478 len = min_t(unsigned int, len, sizeof(opts));
479 if (copy_to_user(optval, (char *) &opts, len))
480 err = -EFAULT;
481
482 break;
483
484 case L2CAP_LM:
485 switch (chan->sec_level) {
486 case BT_SECURITY_LOW:
487 opt = L2CAP_LM_AUTH;
488 break;
489 case BT_SECURITY_MEDIUM:
490 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
491 break;
492 case BT_SECURITY_HIGH:
493 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
494 L2CAP_LM_SECURE;
495 break;
496 case BT_SECURITY_FIPS:
497 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
498 L2CAP_LM_SECURE | L2CAP_LM_FIPS;
499 break;
500 default:
501 opt = 0;
502 break;
503 }
504
505 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
506 opt |= L2CAP_LM_MASTER;
507
508 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
509 opt |= L2CAP_LM_RELIABLE;
510
511 if (put_user(opt, (u32 __user *) optval))
512 err = -EFAULT;
513
514 break;
515
516 case L2CAP_CONNINFO:
517 if (sk->sk_state != BT_CONNECTED &&
518 !(sk->sk_state == BT_CONNECT2 &&
519 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
520 err = -ENOTCONN;
521 break;
522 }
523
524 memset(&cinfo, 0, sizeof(cinfo));
525 cinfo.hci_handle = chan->conn->hcon->handle;
526 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
527
528 len = min_t(unsigned int, len, sizeof(cinfo));
529 if (copy_to_user(optval, (char *) &cinfo, len))
530 err = -EFAULT;
531
532 break;
533
534 default:
535 err = -ENOPROTOOPT;
536 break;
537 }
538
539 release_sock(sk);
540 return err;
541}
542
543static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
544 char __user *optval, int __user *optlen)
545{
546 struct sock *sk = sock->sk;
547 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
548 struct bt_security sec;
549 struct bt_power pwr;
550 u32 phys;
551 int len, mode, err = 0;
552
553 BT_DBG("sk %p", sk);
554
555 if (level == SOL_L2CAP)
556 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
557
558 if (level != SOL_BLUETOOTH)
559 return -ENOPROTOOPT;
560
561 if (get_user(len, optlen))
562 return -EFAULT;
563
564 lock_sock(sk);
565
566 switch (optname) {
567 case BT_SECURITY:
568 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
569 chan->chan_type != L2CAP_CHAN_FIXED &&
570 chan->chan_type != L2CAP_CHAN_RAW) {
571 err = -EINVAL;
572 break;
573 }
574
575 memset(&sec, 0, sizeof(sec));
576 if (chan->conn) {
577 sec.level = chan->conn->hcon->sec_level;
578
579 if (sk->sk_state == BT_CONNECTED)
580 sec.key_size = chan->conn->hcon->enc_key_size;
581 } else {
582 sec.level = chan->sec_level;
583 }
584
585 len = min_t(unsigned int, len, sizeof(sec));
586 if (copy_to_user(optval, (char *) &sec, len))
587 err = -EFAULT;
588
589 break;
590
591 case BT_DEFER_SETUP:
592 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
593 err = -EINVAL;
594 break;
595 }
596
597 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
598 (u32 __user *) optval))
599 err = -EFAULT;
600
601 break;
602
603 case BT_FLUSHABLE:
604 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
605 (u32 __user *) optval))
606 err = -EFAULT;
607
608 break;
609
610 case BT_POWER:
611 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
612 && sk->sk_type != SOCK_RAW) {
613 err = -EINVAL;
614 break;
615 }
616
617 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
618
619 len = min_t(unsigned int, len, sizeof(pwr));
620 if (copy_to_user(optval, (char *) &pwr, len))
621 err = -EFAULT;
622
623 break;
624
625 case BT_CHANNEL_POLICY:
626 if (put_user(chan->chan_policy, (u32 __user *) optval))
627 err = -EFAULT;
628 break;
629
630 case BT_SNDMTU:
631 if (!bdaddr_type_is_le(chan->src_type)) {
632 err = -EINVAL;
633 break;
634 }
635
636 if (sk->sk_state != BT_CONNECTED) {
637 err = -ENOTCONN;
638 break;
639 }
640
641 if (put_user(chan->omtu, (u16 __user *) optval))
642 err = -EFAULT;
643 break;
644
645 case BT_RCVMTU:
646 if (!bdaddr_type_is_le(chan->src_type)) {
647 err = -EINVAL;
648 break;
649 }
650
651 if (put_user(chan->imtu, (u16 __user *) optval))
652 err = -EFAULT;
653 break;
654
655 case BT_PHY:
656 if (sk->sk_state != BT_CONNECTED) {
657 err = -ENOTCONN;
658 break;
659 }
660
661 phys = hci_conn_get_phy(chan->conn->hcon);
662
663 if (put_user(phys, (u32 __user *) optval))
664 err = -EFAULT;
665 break;
666
667 case BT_MODE:
668 if (!enable_ecred) {
669 err = -ENOPROTOOPT;
670 break;
671 }
672
673 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
674 err = -EINVAL;
675 break;
676 }
677
678 mode = l2cap_get_mode(chan);
679 if (mode < 0) {
680 err = mode;
681 break;
682 }
683
684 if (put_user(mode, (u8 __user *) optval))
685 err = -EFAULT;
686 break;
687
688 default:
689 err = -ENOPROTOOPT;
690 break;
691 }
692
693 release_sock(sk);
694 return err;
695}
696
697static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
698{
699 switch (chan->scid) {
700 case L2CAP_CID_ATT:
701 if (mtu < L2CAP_LE_MIN_MTU)
702 return false;
703 break;
704
705 default:
706 if (mtu < L2CAP_DEFAULT_MIN_MTU)
707 return false;
708 }
709
710 return true;
711}
712
713static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
714 sockptr_t optval, unsigned int optlen)
715{
716 struct sock *sk = sock->sk;
717 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
718 struct l2cap_options opts;
719 int len, err = 0;
720 u32 opt;
721
722 BT_DBG("sk %p", sk);
723
724 lock_sock(sk);
725
726 switch (optname) {
727 case L2CAP_OPTIONS:
728 if (bdaddr_type_is_le(chan->src_type)) {
729 err = -EINVAL;
730 break;
731 }
732
733 if (sk->sk_state == BT_CONNECTED) {
734 err = -EINVAL;
735 break;
736 }
737
738 opts.imtu = chan->imtu;
739 opts.omtu = chan->omtu;
740 opts.flush_to = chan->flush_to;
741 opts.mode = chan->mode;
742 opts.fcs = chan->fcs;
743 opts.max_tx = chan->max_tx;
744 opts.txwin_size = chan->tx_win;
745
746 len = min_t(unsigned int, sizeof(opts), optlen);
747 if (copy_from_sockptr(&opts, optval, len)) {
748 err = -EFAULT;
749 break;
750 }
751
752 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
753 err = -EINVAL;
754 break;
755 }
756
757 if (!l2cap_valid_mtu(chan, opts.imtu)) {
758 err = -EINVAL;
759 break;
760 }
761
762 /* Only BR/EDR modes are supported here */
763 switch (opts.mode) {
764 case L2CAP_MODE_BASIC:
765 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
766 break;
767 case L2CAP_MODE_ERTM:
768 case L2CAP_MODE_STREAMING:
769 if (!disable_ertm)
770 break;
771 fallthrough;
772 default:
773 err = -EINVAL;
774 break;
775 }
776
777 if (err < 0)
778 break;
779
780 chan->mode = opts.mode;
781
782 BT_DBG("mode 0x%2.2x", chan->mode);
783
784 chan->imtu = opts.imtu;
785 chan->omtu = opts.omtu;
786 chan->fcs = opts.fcs;
787 chan->max_tx = opts.max_tx;
788 chan->tx_win = opts.txwin_size;
789 chan->flush_to = opts.flush_to;
790 break;
791
792 case L2CAP_LM:
793 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
794 err = -EFAULT;
795 break;
796 }
797
798 if (opt & L2CAP_LM_FIPS) {
799 err = -EINVAL;
800 break;
801 }
802
803 if (opt & L2CAP_LM_AUTH)
804 chan->sec_level = BT_SECURITY_LOW;
805 if (opt & L2CAP_LM_ENCRYPT)
806 chan->sec_level = BT_SECURITY_MEDIUM;
807 if (opt & L2CAP_LM_SECURE)
808 chan->sec_level = BT_SECURITY_HIGH;
809
810 if (opt & L2CAP_LM_MASTER)
811 set_bit(FLAG_ROLE_SWITCH, &chan->flags);
812 else
813 clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
814
815 if (opt & L2CAP_LM_RELIABLE)
816 set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
817 else
818 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
819 break;
820
821 default:
822 err = -ENOPROTOOPT;
823 break;
824 }
825
826 release_sock(sk);
827 return err;
828}
829
830static int l2cap_set_mode(struct l2cap_chan *chan, u8 mode)
831{
832 switch (mode) {
833 case BT_MODE_BASIC:
834 if (bdaddr_type_is_le(chan->src_type))
835 return -EINVAL;
836 mode = L2CAP_MODE_BASIC;
837 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
838 break;
839 case BT_MODE_ERTM:
840 if (!disable_ertm || bdaddr_type_is_le(chan->src_type))
841 return -EINVAL;
842 mode = L2CAP_MODE_ERTM;
843 break;
844 case BT_MODE_STREAMING:
845 if (!disable_ertm || bdaddr_type_is_le(chan->src_type))
846 return -EINVAL;
847 mode = L2CAP_MODE_STREAMING;
848 break;
849 case BT_MODE_LE_FLOWCTL:
850 if (!bdaddr_type_is_le(chan->src_type))
851 return -EINVAL;
852 mode = L2CAP_MODE_LE_FLOWCTL;
853 break;
854 case BT_MODE_EXT_FLOWCTL:
855 /* TODO: Add support for ECRED PDUs to BR/EDR */
856 if (!bdaddr_type_is_le(chan->src_type))
857 return -EINVAL;
858 mode = L2CAP_MODE_EXT_FLOWCTL;
859 break;
860 default:
861 return -EINVAL;
862 }
863
864 chan->mode = mode;
865
866 return 0;
867}
868
869static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
870 sockptr_t optval, unsigned int optlen)
871{
872 struct sock *sk = sock->sk;
873 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
874 struct bt_security sec;
875 struct bt_power pwr;
876 struct l2cap_conn *conn;
877 int len, err = 0;
878 u32 opt;
879
880 BT_DBG("sk %p", sk);
881
882 if (level == SOL_L2CAP)
883 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
884
885 if (level != SOL_BLUETOOTH)
886 return -ENOPROTOOPT;
887
888 lock_sock(sk);
889
890 switch (optname) {
891 case BT_SECURITY:
892 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
893 chan->chan_type != L2CAP_CHAN_FIXED &&
894 chan->chan_type != L2CAP_CHAN_RAW) {
895 err = -EINVAL;
896 break;
897 }
898
899 sec.level = BT_SECURITY_LOW;
900
901 len = min_t(unsigned int, sizeof(sec), optlen);
902 if (copy_from_sockptr(&sec, optval, len)) {
903 err = -EFAULT;
904 break;
905 }
906
907 if (sec.level < BT_SECURITY_LOW ||
908 sec.level > BT_SECURITY_FIPS) {
909 err = -EINVAL;
910 break;
911 }
912
913 chan->sec_level = sec.level;
914
915 if (!chan->conn)
916 break;
917
918 conn = chan->conn;
919
920 /* change security for LE channels */
921 if (chan->scid == L2CAP_CID_ATT) {
922 if (smp_conn_security(conn->hcon, sec.level)) {
923 err = -EINVAL;
924 break;
925 }
926
927 set_bit(FLAG_PENDING_SECURITY, &chan->flags);
928 sk->sk_state = BT_CONFIG;
929 chan->state = BT_CONFIG;
930
931 /* or for ACL link */
932 } else if ((sk->sk_state == BT_CONNECT2 &&
933 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
934 sk->sk_state == BT_CONNECTED) {
935 if (!l2cap_chan_check_security(chan, true))
936 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
937 else
938 sk->sk_state_change(sk);
939 } else {
940 err = -EINVAL;
941 }
942 break;
943
944 case BT_DEFER_SETUP:
945 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
946 err = -EINVAL;
947 break;
948 }
949
950 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
951 err = -EFAULT;
952 break;
953 }
954
955 if (opt) {
956 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
957 set_bit(FLAG_DEFER_SETUP, &chan->flags);
958 } else {
959 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
960 clear_bit(FLAG_DEFER_SETUP, &chan->flags);
961 }
962 break;
963
964 case BT_FLUSHABLE:
965 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
966 err = -EFAULT;
967 break;
968 }
969
970 if (opt > BT_FLUSHABLE_ON) {
971 err = -EINVAL;
972 break;
973 }
974
975 if (opt == BT_FLUSHABLE_OFF) {
976 conn = chan->conn;
977 /* proceed further only when we have l2cap_conn and
978 No Flush support in the LM */
979 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
980 err = -EINVAL;
981 break;
982 }
983 }
984
985 if (opt)
986 set_bit(FLAG_FLUSHABLE, &chan->flags);
987 else
988 clear_bit(FLAG_FLUSHABLE, &chan->flags);
989 break;
990
991 case BT_POWER:
992 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
993 chan->chan_type != L2CAP_CHAN_RAW) {
994 err = -EINVAL;
995 break;
996 }
997
998 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
999
1000 len = min_t(unsigned int, sizeof(pwr), optlen);
1001 if (copy_from_sockptr(&pwr, optval, len)) {
1002 err = -EFAULT;
1003 break;
1004 }
1005
1006 if (pwr.force_active)
1007 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1008 else
1009 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1010 break;
1011
1012 case BT_CHANNEL_POLICY:
1013 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
1014 err = -EFAULT;
1015 break;
1016 }
1017
1018 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
1019 err = -EINVAL;
1020 break;
1021 }
1022
1023 if (chan->mode != L2CAP_MODE_ERTM &&
1024 chan->mode != L2CAP_MODE_STREAMING) {
1025 err = -EOPNOTSUPP;
1026 break;
1027 }
1028
1029 chan->chan_policy = (u8) opt;
1030
1031 if (sk->sk_state == BT_CONNECTED &&
1032 chan->move_role == L2CAP_MOVE_ROLE_NONE)
1033 l2cap_move_start(chan);
1034
1035 break;
1036
1037 case BT_SNDMTU:
1038 if (!bdaddr_type_is_le(chan->src_type)) {
1039 err = -EINVAL;
1040 break;
1041 }
1042
1043 /* Setting is not supported as it's the remote side that
1044 * decides this.
1045 */
1046 err = -EPERM;
1047 break;
1048
1049 case BT_RCVMTU:
1050 if (!bdaddr_type_is_le(chan->src_type)) {
1051 err = -EINVAL;
1052 break;
1053 }
1054
1055 if (chan->mode == L2CAP_MODE_LE_FLOWCTL &&
1056 sk->sk_state == BT_CONNECTED) {
1057 err = -EISCONN;
1058 break;
1059 }
1060
1061 if (copy_from_sockptr(&opt, optval, sizeof(u16))) {
1062 err = -EFAULT;
1063 break;
1064 }
1065
1066 if (chan->mode == L2CAP_MODE_EXT_FLOWCTL &&
1067 sk->sk_state == BT_CONNECTED)
1068 err = l2cap_chan_reconfigure(chan, opt);
1069 else
1070 chan->imtu = opt;
1071
1072 break;
1073
1074 case BT_MODE:
1075 if (!enable_ecred) {
1076 err = -ENOPROTOOPT;
1077 break;
1078 }
1079
1080 BT_DBG("sk->sk_state %u", sk->sk_state);
1081
1082 if (sk->sk_state != BT_BOUND) {
1083 err = -EINVAL;
1084 break;
1085 }
1086
1087 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1088 err = -EINVAL;
1089 break;
1090 }
1091
1092 if (copy_from_sockptr(&opt, optval, sizeof(u8))) {
1093 err = -EFAULT;
1094 break;
1095 }
1096
1097 BT_DBG("opt %u", opt);
1098
1099 err = l2cap_set_mode(chan, opt);
1100 if (err)
1101 break;
1102
1103 BT_DBG("mode 0x%2.2x", chan->mode);
1104
1105 break;
1106
1107 default:
1108 err = -ENOPROTOOPT;
1109 break;
1110 }
1111
1112 release_sock(sk);
1113 return err;
1114}
1115
1116static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1117 size_t len)
1118{
1119 struct sock *sk = sock->sk;
1120 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1121 int err;
1122
1123 BT_DBG("sock %p, sk %p", sock, sk);
1124
1125 err = sock_error(sk);
1126 if (err)
1127 return err;
1128
1129 if (msg->msg_flags & MSG_OOB)
1130 return -EOPNOTSUPP;
1131
1132 if (sk->sk_state != BT_CONNECTED)
1133 return -ENOTCONN;
1134
1135 lock_sock(sk);
1136 err = bt_sock_wait_ready(sk, msg->msg_flags);
1137 release_sock(sk);
1138 if (err)
1139 return err;
1140
1141 l2cap_chan_lock(chan);
1142 err = l2cap_chan_send(chan, msg, len);
1143 l2cap_chan_unlock(chan);
1144
1145 return err;
1146}
1147
1148static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1149 size_t len, int flags)
1150{
1151 struct sock *sk = sock->sk;
1152 struct l2cap_pinfo *pi = l2cap_pi(sk);
1153 int err;
1154
1155 lock_sock(sk);
1156
1157 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
1158 &bt_sk(sk)->flags)) {
1159 if (pi->chan->mode == L2CAP_MODE_EXT_FLOWCTL) {
1160 sk->sk_state = BT_CONNECTED;
1161 pi->chan->state = BT_CONNECTED;
1162 __l2cap_ecred_conn_rsp_defer(pi->chan);
1163 } else if (bdaddr_type_is_le(pi->chan->src_type)) {
1164 sk->sk_state = BT_CONNECTED;
1165 pi->chan->state = BT_CONNECTED;
1166 __l2cap_le_connect_rsp_defer(pi->chan);
1167 } else {
1168 sk->sk_state = BT_CONFIG;
1169 pi->chan->state = BT_CONFIG;
1170 __l2cap_connect_rsp_defer(pi->chan);
1171 }
1172
1173 err = 0;
1174 goto done;
1175 }
1176
1177 release_sock(sk);
1178
1179 if (sock->type == SOCK_STREAM)
1180 err = bt_sock_stream_recvmsg(sock, msg, len, flags);
1181 else
1182 err = bt_sock_recvmsg(sock, msg, len, flags);
1183
1184 if (pi->chan->mode != L2CAP_MODE_ERTM)
1185 return err;
1186
1187 /* Attempt to put pending rx data in the socket buffer */
1188
1189 lock_sock(sk);
1190
1191 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
1192 goto done;
1193
1194 if (pi->rx_busy_skb) {
1195 if (!__sock_queue_rcv_skb(sk, pi->rx_busy_skb))
1196 pi->rx_busy_skb = NULL;
1197 else
1198 goto done;
1199 }
1200
1201 /* Restore data flow when half of the receive buffer is
1202 * available. This avoids resending large numbers of
1203 * frames.
1204 */
1205 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1206 l2cap_chan_busy(pi->chan, 0);
1207
1208done:
1209 release_sock(sk);
1210 return err;
1211}
1212
1213/* Kill socket (only if zapped and orphan)
1214 * Must be called on unlocked socket, with l2cap channel lock.
1215 */
1216static void l2cap_sock_kill(struct sock *sk)
1217{
1218 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1219 return;
1220
1221 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
1222
1223 /* Kill poor orphan */
1224
1225 l2cap_chan_put(l2cap_pi(sk)->chan);
1226 sock_set_flag(sk, SOCK_DEAD);
1227 sock_put(sk);
1228}
1229
1230static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
1231{
1232 DECLARE_WAITQUEUE(wait, current);
1233 int err = 0;
1234 int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1235 /* Timeout to prevent infinite loop */
1236 unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
1237
1238 add_wait_queue(sk_sleep(sk), &wait);
1239 set_current_state(TASK_INTERRUPTIBLE);
1240 do {
1241 BT_DBG("Waiting for %d ACKs, timeout %04d ms",
1242 chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
1243 jiffies_to_msecs(timeout - jiffies));
1244
1245 if (!timeo)
1246 timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1247
1248 if (signal_pending(current)) {
1249 err = sock_intr_errno(timeo);
1250 break;
1251 }
1252
1253 release_sock(sk);
1254 timeo = schedule_timeout(timeo);
1255 lock_sock(sk);
1256 set_current_state(TASK_INTERRUPTIBLE);
1257
1258 err = sock_error(sk);
1259 if (err)
1260 break;
1261
1262 if (time_after(jiffies, timeout)) {
1263 err = -ENOLINK;
1264 break;
1265 }
1266
1267 } while (chan->unacked_frames > 0 &&
1268 chan->state == BT_CONNECTED);
1269
1270 set_current_state(TASK_RUNNING);
1271 remove_wait_queue(sk_sleep(sk), &wait);
1272 return err;
1273}
1274
1275static int l2cap_sock_shutdown(struct socket *sock, int how)
1276{
1277 struct sock *sk = sock->sk;
1278 struct l2cap_chan *chan;
1279 struct l2cap_conn *conn;
1280 int err = 0;
1281
1282 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1283
1284 /* 'how' parameter is mapped to sk_shutdown as follows:
1285 * SHUT_RD (0) --> RCV_SHUTDOWN (1)
1286 * SHUT_WR (1) --> SEND_SHUTDOWN (2)
1287 * SHUT_RDWR (2) --> SHUTDOWN_MASK (3)
1288 */
1289 how++;
1290
1291 if (!sk)
1292 return 0;
1293
1294 lock_sock(sk);
1295
1296 if ((sk->sk_shutdown & how) == how)
1297 goto shutdown_already;
1298
1299 BT_DBG("Handling sock shutdown");
1300
1301 /* prevent sk structure from being freed whilst unlocked */
1302 sock_hold(sk);
1303
1304 chan = l2cap_pi(sk)->chan;
1305 /* prevent chan structure from being freed whilst unlocked */
1306 l2cap_chan_hold(chan);
1307
1308 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1309
1310 if (chan->mode == L2CAP_MODE_ERTM &&
1311 chan->unacked_frames > 0 &&
1312 chan->state == BT_CONNECTED) {
1313 err = __l2cap_wait_ack(sk, chan);
1314
1315 /* After waiting for ACKs, check whether shutdown
1316 * has already been actioned to close the L2CAP
1317 * link such as by l2cap_disconnection_req().
1318 */
1319 if ((sk->sk_shutdown & how) == how)
1320 goto shutdown_matched;
1321 }
1322
1323 /* Try setting the RCV_SHUTDOWN bit, return early if SEND_SHUTDOWN
1324 * is already set
1325 */
1326 if ((how & RCV_SHUTDOWN) && !(sk->sk_shutdown & RCV_SHUTDOWN)) {
1327 sk->sk_shutdown |= RCV_SHUTDOWN;
1328 if ((sk->sk_shutdown & how) == how)
1329 goto shutdown_matched;
1330 }
1331
1332 sk->sk_shutdown |= SEND_SHUTDOWN;
1333 release_sock(sk);
1334
1335 l2cap_chan_lock(chan);
1336 conn = chan->conn;
1337 if (conn)
1338 /* prevent conn structure from being freed */
1339 l2cap_conn_get(conn);
1340 l2cap_chan_unlock(chan);
1341
1342 if (conn)
1343 /* mutex lock must be taken before l2cap_chan_lock() */
1344 mutex_lock(&conn->chan_lock);
1345
1346 l2cap_chan_lock(chan);
1347 l2cap_chan_close(chan, 0);
1348 l2cap_chan_unlock(chan);
1349
1350 if (conn) {
1351 mutex_unlock(&conn->chan_lock);
1352 l2cap_conn_put(conn);
1353 }
1354
1355 lock_sock(sk);
1356
1357 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1358 !(current->flags & PF_EXITING))
1359 err = bt_sock_wait_state(sk, BT_CLOSED,
1360 sk->sk_lingertime);
1361
1362shutdown_matched:
1363 l2cap_chan_put(chan);
1364 sock_put(sk);
1365
1366shutdown_already:
1367 if (!err && sk->sk_err)
1368 err = -sk->sk_err;
1369
1370 release_sock(sk);
1371
1372 BT_DBG("Sock shutdown complete err: %d", err);
1373
1374 return err;
1375}
1376
1377static int l2cap_sock_release(struct socket *sock)
1378{
1379 struct sock *sk = sock->sk;
1380 int err;
1381 struct l2cap_chan *chan;
1382
1383 BT_DBG("sock %p, sk %p", sock, sk);
1384
1385 if (!sk)
1386 return 0;
1387
1388 bt_sock_unlink(&l2cap_sk_list, sk);
1389
1390 err = l2cap_sock_shutdown(sock, SHUT_RDWR);
1391 chan = l2cap_pi(sk)->chan;
1392
1393 l2cap_chan_hold(chan);
1394 l2cap_chan_lock(chan);
1395
1396 sock_orphan(sk);
1397 l2cap_sock_kill(sk);
1398
1399 l2cap_chan_unlock(chan);
1400 l2cap_chan_put(chan);
1401
1402 return err;
1403}
1404
1405static void l2cap_sock_cleanup_listen(struct sock *parent)
1406{
1407 struct sock *sk;
1408
1409 BT_DBG("parent %p state %s", parent,
1410 state_to_string(parent->sk_state));
1411
1412 /* Close not yet accepted channels */
1413 while ((sk = bt_accept_dequeue(parent, NULL))) {
1414 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1415
1416 BT_DBG("child chan %p state %s", chan,
1417 state_to_string(chan->state));
1418
1419 l2cap_chan_hold(chan);
1420 l2cap_chan_lock(chan);
1421
1422 __clear_chan_timer(chan);
1423 l2cap_chan_close(chan, ECONNRESET);
1424 l2cap_sock_kill(sk);
1425
1426 l2cap_chan_unlock(chan);
1427 l2cap_chan_put(chan);
1428 }
1429}
1430
1431static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1432{
1433 struct sock *sk, *parent = chan->data;
1434
1435 lock_sock(parent);
1436
1437 /* Check for backlog size */
1438 if (sk_acceptq_is_full(parent)) {
1439 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1440 release_sock(parent);
1441 return NULL;
1442 }
1443
1444 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1445 GFP_ATOMIC, 0);
1446 if (!sk) {
1447 release_sock(parent);
1448 return NULL;
1449 }
1450
1451 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1452
1453 l2cap_sock_init(sk, parent);
1454
1455 bt_accept_enqueue(parent, sk, false);
1456
1457 release_sock(parent);
1458
1459 return l2cap_pi(sk)->chan;
1460}
1461
1462static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1463{
1464 struct sock *sk = chan->data;
1465 int err;
1466
1467 lock_sock(sk);
1468
1469 if (l2cap_pi(sk)->rx_busy_skb) {
1470 err = -ENOMEM;
1471 goto done;
1472 }
1473
1474 if (chan->mode != L2CAP_MODE_ERTM &&
1475 chan->mode != L2CAP_MODE_STREAMING) {
1476 /* Even if no filter is attached, we could potentially
1477 * get errors from security modules, etc.
1478 */
1479 err = sk_filter(sk, skb);
1480 if (err)
1481 goto done;
1482 }
1483
1484 err = __sock_queue_rcv_skb(sk, skb);
1485
1486 /* For ERTM, handle one skb that doesn't fit into the recv
1487 * buffer. This is important to do because the data frames
1488 * have already been acked, so the skb cannot be discarded.
1489 *
1490 * Notify the l2cap core that the buffer is full, so the
1491 * LOCAL_BUSY state is entered and no more frames are
1492 * acked and reassembled until there is buffer space
1493 * available.
1494 */
1495 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1496 l2cap_pi(sk)->rx_busy_skb = skb;
1497 l2cap_chan_busy(chan, 1);
1498 err = 0;
1499 }
1500
1501done:
1502 release_sock(sk);
1503
1504 return err;
1505}
1506
1507static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1508{
1509 struct sock *sk = chan->data;
1510
1511 l2cap_sock_kill(sk);
1512}
1513
1514static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1515{
1516 struct sock *sk = chan->data;
1517 struct sock *parent;
1518
1519 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1520
1521 /* This callback can be called both for server (BT_LISTEN)
1522 * sockets as well as "normal" ones. To avoid lockdep warnings
1523 * with child socket locking (through l2cap_sock_cleanup_listen)
1524 * we need separation into separate nesting levels. The simplest
1525 * way to accomplish this is to inherit the nesting level used
1526 * for the channel.
1527 */
1528 lock_sock_nested(sk, atomic_read(&chan->nesting));
1529
1530 parent = bt_sk(sk)->parent;
1531
1532 switch (chan->state) {
1533 case BT_OPEN:
1534 case BT_BOUND:
1535 case BT_CLOSED:
1536 break;
1537 case BT_LISTEN:
1538 l2cap_sock_cleanup_listen(sk);
1539 sk->sk_state = BT_CLOSED;
1540 chan->state = BT_CLOSED;
1541
1542 break;
1543 default:
1544 sk->sk_state = BT_CLOSED;
1545 chan->state = BT_CLOSED;
1546
1547 sk->sk_err = err;
1548
1549 if (parent) {
1550 bt_accept_unlink(sk);
1551 parent->sk_data_ready(parent);
1552 } else {
1553 sk->sk_state_change(sk);
1554 }
1555
1556 break;
1557 }
1558 release_sock(sk);
1559
1560 /* Only zap after cleanup to avoid use after free race */
1561 sock_set_flag(sk, SOCK_ZAPPED);
1562
1563}
1564
1565static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1566 int err)
1567{
1568 struct sock *sk = chan->data;
1569
1570 sk->sk_state = state;
1571
1572 if (err)
1573 sk->sk_err = err;
1574}
1575
1576static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1577 unsigned long hdr_len,
1578 unsigned long len, int nb)
1579{
1580 struct sock *sk = chan->data;
1581 struct sk_buff *skb;
1582 int err;
1583
1584 l2cap_chan_unlock(chan);
1585 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1586 l2cap_chan_lock(chan);
1587
1588 if (!skb)
1589 return ERR_PTR(err);
1590
1591 skb->priority = sk->sk_priority;
1592
1593 bt_cb(skb)->l2cap.chan = chan;
1594
1595 return skb;
1596}
1597
1598static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1599{
1600 struct sock *sk = chan->data;
1601 struct sock *parent;
1602
1603 lock_sock(sk);
1604
1605 parent = bt_sk(sk)->parent;
1606
1607 BT_DBG("sk %p, parent %p", sk, parent);
1608
1609 sk->sk_state = BT_CONNECTED;
1610 sk->sk_state_change(sk);
1611
1612 if (parent)
1613 parent->sk_data_ready(parent);
1614
1615 release_sock(sk);
1616}
1617
1618static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1619{
1620 struct sock *parent, *sk = chan->data;
1621
1622 lock_sock(sk);
1623
1624 parent = bt_sk(sk)->parent;
1625 if (parent)
1626 parent->sk_data_ready(parent);
1627
1628 release_sock(sk);
1629}
1630
1631static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1632{
1633 struct sock *sk = chan->data;
1634
1635 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1636 sk->sk_state = BT_CONNECTED;
1637 chan->state = BT_CONNECTED;
1638 }
1639
1640 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1641 sk->sk_state_change(sk);
1642}
1643
1644static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1645{
1646 struct sock *sk = chan->data;
1647
1648 lock_sock(sk);
1649 sk->sk_shutdown = SHUTDOWN_MASK;
1650 release_sock(sk);
1651}
1652
1653static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1654{
1655 struct sock *sk = chan->data;
1656
1657 return sk->sk_sndtimeo;
1658}
1659
1660static struct pid *l2cap_sock_get_peer_pid_cb(struct l2cap_chan *chan)
1661{
1662 struct sock *sk = chan->data;
1663
1664 return sk->sk_peer_pid;
1665}
1666
1667static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1668{
1669 struct sock *sk = chan->data;
1670
1671 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1672 sk->sk_state_change(sk);
1673}
1674
1675static int l2cap_sock_filter(struct l2cap_chan *chan, struct sk_buff *skb)
1676{
1677 struct sock *sk = chan->data;
1678
1679 switch (chan->mode) {
1680 case L2CAP_MODE_ERTM:
1681 case L2CAP_MODE_STREAMING:
1682 return sk_filter(sk, skb);
1683 }
1684
1685 return 0;
1686}
1687
1688static const struct l2cap_ops l2cap_chan_ops = {
1689 .name = "L2CAP Socket Interface",
1690 .new_connection = l2cap_sock_new_connection_cb,
1691 .recv = l2cap_sock_recv_cb,
1692 .close = l2cap_sock_close_cb,
1693 .teardown = l2cap_sock_teardown_cb,
1694 .state_change = l2cap_sock_state_change_cb,
1695 .ready = l2cap_sock_ready_cb,
1696 .defer = l2cap_sock_defer_cb,
1697 .resume = l2cap_sock_resume_cb,
1698 .suspend = l2cap_sock_suspend_cb,
1699 .set_shutdown = l2cap_sock_set_shutdown_cb,
1700 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1701 .get_peer_pid = l2cap_sock_get_peer_pid_cb,
1702 .alloc_skb = l2cap_sock_alloc_skb_cb,
1703 .filter = l2cap_sock_filter,
1704};
1705
1706static void l2cap_sock_destruct(struct sock *sk)
1707{
1708 BT_DBG("sk %p", sk);
1709
1710 if (l2cap_pi(sk)->chan)
1711 l2cap_chan_put(l2cap_pi(sk)->chan);
1712
1713 if (l2cap_pi(sk)->rx_busy_skb) {
1714 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1715 l2cap_pi(sk)->rx_busy_skb = NULL;
1716 }
1717
1718 skb_queue_purge(&sk->sk_receive_queue);
1719 skb_queue_purge(&sk->sk_write_queue);
1720}
1721
1722static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1723 int *msg_namelen)
1724{
1725 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1726
1727 memset(la, 0, sizeof(struct sockaddr_l2));
1728 la->l2_family = AF_BLUETOOTH;
1729 la->l2_psm = bt_cb(skb)->l2cap.psm;
1730 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr);
1731
1732 *msg_namelen = sizeof(struct sockaddr_l2);
1733}
1734
1735static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1736{
1737 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1738
1739 BT_DBG("sk %p", sk);
1740
1741 if (parent) {
1742 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1743
1744 sk->sk_type = parent->sk_type;
1745 bt_sk(sk)->flags = bt_sk(parent)->flags;
1746
1747 chan->chan_type = pchan->chan_type;
1748 chan->imtu = pchan->imtu;
1749 chan->omtu = pchan->omtu;
1750 chan->conf_state = pchan->conf_state;
1751 chan->mode = pchan->mode;
1752 chan->fcs = pchan->fcs;
1753 chan->max_tx = pchan->max_tx;
1754 chan->tx_win = pchan->tx_win;
1755 chan->tx_win_max = pchan->tx_win_max;
1756 chan->sec_level = pchan->sec_level;
1757 chan->flags = pchan->flags;
1758 chan->tx_credits = pchan->tx_credits;
1759 chan->rx_credits = pchan->rx_credits;
1760
1761 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1762 chan->scid = pchan->scid;
1763 chan->dcid = pchan->scid;
1764 }
1765
1766 security_sk_clone(parent, sk);
1767 } else {
1768 switch (sk->sk_type) {
1769 case SOCK_RAW:
1770 chan->chan_type = L2CAP_CHAN_RAW;
1771 break;
1772 case SOCK_DGRAM:
1773 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1774 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1775 break;
1776 case SOCK_SEQPACKET:
1777 case SOCK_STREAM:
1778 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1779 break;
1780 }
1781
1782 chan->imtu = L2CAP_DEFAULT_MTU;
1783 chan->omtu = 0;
1784 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1785 chan->mode = L2CAP_MODE_ERTM;
1786 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1787 } else {
1788 chan->mode = L2CAP_MODE_BASIC;
1789 }
1790
1791 l2cap_chan_set_defaults(chan);
1792 }
1793
1794 /* Default config options */
1795 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1796
1797 chan->data = sk;
1798 chan->ops = &l2cap_chan_ops;
1799}
1800
1801static struct proto l2cap_proto = {
1802 .name = "L2CAP",
1803 .owner = THIS_MODULE,
1804 .obj_size = sizeof(struct l2cap_pinfo)
1805};
1806
1807static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1808 int proto, gfp_t prio, int kern)
1809{
1810 struct sock *sk;
1811 struct l2cap_chan *chan;
1812
1813 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, kern);
1814 if (!sk)
1815 return NULL;
1816
1817 sock_init_data(sock, sk);
1818 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1819
1820 sk->sk_destruct = l2cap_sock_destruct;
1821 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1822
1823 sock_reset_flag(sk, SOCK_ZAPPED);
1824
1825 sk->sk_protocol = proto;
1826 sk->sk_state = BT_OPEN;
1827
1828 chan = l2cap_chan_create();
1829 if (!chan) {
1830 sk_free(sk);
1831 return NULL;
1832 }
1833
1834 l2cap_chan_hold(chan);
1835
1836 l2cap_pi(sk)->chan = chan;
1837
1838 return sk;
1839}
1840
1841static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1842 int kern)
1843{
1844 struct sock *sk;
1845
1846 BT_DBG("sock %p", sock);
1847
1848 sock->state = SS_UNCONNECTED;
1849
1850 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1851 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1852 return -ESOCKTNOSUPPORT;
1853
1854 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1855 return -EPERM;
1856
1857 sock->ops = &l2cap_sock_ops;
1858
1859 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
1860 if (!sk)
1861 return -ENOMEM;
1862
1863 l2cap_sock_init(sk, NULL);
1864 bt_sock_link(&l2cap_sk_list, sk);
1865 return 0;
1866}
1867
1868static const struct proto_ops l2cap_sock_ops = {
1869 .family = PF_BLUETOOTH,
1870 .owner = THIS_MODULE,
1871 .release = l2cap_sock_release,
1872 .bind = l2cap_sock_bind,
1873 .connect = l2cap_sock_connect,
1874 .listen = l2cap_sock_listen,
1875 .accept = l2cap_sock_accept,
1876 .getname = l2cap_sock_getname,
1877 .sendmsg = l2cap_sock_sendmsg,
1878 .recvmsg = l2cap_sock_recvmsg,
1879 .poll = bt_sock_poll,
1880 .ioctl = bt_sock_ioctl,
1881 .gettstamp = sock_gettstamp,
1882 .mmap = sock_no_mmap,
1883 .socketpair = sock_no_socketpair,
1884 .shutdown = l2cap_sock_shutdown,
1885 .setsockopt = l2cap_sock_setsockopt,
1886 .getsockopt = l2cap_sock_getsockopt
1887};
1888
1889static const struct net_proto_family l2cap_sock_family_ops = {
1890 .family = PF_BLUETOOTH,
1891 .owner = THIS_MODULE,
1892 .create = l2cap_sock_create,
1893};
1894
1895int __init l2cap_init_sockets(void)
1896{
1897 int err;
1898
1899 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1900
1901 err = proto_register(&l2cap_proto, 0);
1902 if (err < 0)
1903 return err;
1904
1905 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1906 if (err < 0) {
1907 BT_ERR("L2CAP socket registration failed");
1908 goto error;
1909 }
1910
1911 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1912 NULL);
1913 if (err < 0) {
1914 BT_ERR("Failed to create L2CAP proc file");
1915 bt_sock_unregister(BTPROTO_L2CAP);
1916 goto error;
1917 }
1918
1919 BT_INFO("L2CAP socket layer initialized");
1920
1921 return 0;
1922
1923error:
1924 proto_unregister(&l2cap_proto);
1925 return err;
1926}
1927
1928void l2cap_cleanup_sockets(void)
1929{
1930 bt_procfs_cleanup(&init_net, "l2cap");
1931 bt_sock_unregister(BTPROTO_L2CAP);
1932 proto_unregister(&l2cap_proto);
1933}