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