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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/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);
49
50bool l2cap_is_socket(struct socket *sock)
51{
52 return sock && sock->ops == &l2cap_sock_ops;
53}
54EXPORT_SYMBOL(l2cap_is_socket);
55
56static int l2cap_validate_bredr_psm(u16 psm)
57{
58 /* PSM must be odd and lsb of upper byte must be 0 */
59 if ((psm & 0x0101) != 0x0001)
60 return -EINVAL;
61
62 /* Restrict usage of well-known PSMs */
63 if (psm < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE))
64 return -EACCES;
65
66 return 0;
67}
68
69static int l2cap_validate_le_psm(u16 psm)
70{
71 /* Valid LE_PSM ranges are defined only until 0x00ff */
72 if (psm > L2CAP_PSM_LE_DYN_END)
73 return -EINVAL;
74
75 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
76 if (psm < L2CAP_PSM_LE_DYN_START && !capable(CAP_NET_BIND_SERVICE))
77 return -EACCES;
78
79 return 0;
80}
81
82static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
83{
84 struct sock *sk = sock->sk;
85 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
86 struct sockaddr_l2 la;
87 int len, err = 0;
88
89 BT_DBG("sk %p", sk);
90
91 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
92 addr->sa_family != AF_BLUETOOTH)
93 return -EINVAL;
94
95 memset(&la, 0, sizeof(la));
96 len = min_t(unsigned int, sizeof(la), alen);
97 memcpy(&la, addr, len);
98
99 if (la.l2_cid && la.l2_psm)
100 return -EINVAL;
101
102 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
103 return -EINVAL;
104
105 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
106 /* We only allow ATT user space socket */
107 if (la.l2_cid &&
108 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
109 return -EINVAL;
110 }
111
112 lock_sock(sk);
113
114 if (sk->sk_state != BT_OPEN) {
115 err = -EBADFD;
116 goto done;
117 }
118
119 if (la.l2_psm) {
120 __u16 psm = __le16_to_cpu(la.l2_psm);
121
122 if (la.l2_bdaddr_type == BDADDR_BREDR)
123 err = l2cap_validate_bredr_psm(psm);
124 else
125 err = l2cap_validate_le_psm(psm);
126
127 if (err)
128 goto done;
129 }
130
131 bacpy(&chan->src, &la.l2_bdaddr);
132 chan->src_type = la.l2_bdaddr_type;
133
134 if (la.l2_cid)
135 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
136 else
137 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
138
139 if (err < 0)
140 goto done;
141
142 switch (chan->chan_type) {
143 case L2CAP_CHAN_CONN_LESS:
144 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP)
145 chan->sec_level = BT_SECURITY_SDP;
146 break;
147 case L2CAP_CHAN_CONN_ORIENTED:
148 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP ||
149 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM)
150 chan->sec_level = BT_SECURITY_SDP;
151 break;
152 case L2CAP_CHAN_RAW:
153 chan->sec_level = BT_SECURITY_SDP;
154 break;
155 case L2CAP_CHAN_FIXED:
156 /* Fixed channels default to the L2CAP core not holding a
157 * hci_conn reference for them. For fixed channels mapping to
158 * L2CAP sockets we do want to hold a reference so set the
159 * appropriate flag to request it.
160 */
161 set_bit(FLAG_HOLD_HCI_CONN, &chan->flags);
162 break;
163 }
164
165 /* Use L2CAP_MODE_LE_FLOWCTL (CoC) in case of LE address and
166 * L2CAP_MODE_EXT_FLOWCTL (ECRED) has not been set.
167 */
168 if (chan->psm && bdaddr_type_is_le(chan->src_type) &&
169 chan->mode != L2CAP_MODE_EXT_FLOWCTL)
170 chan->mode = L2CAP_MODE_LE_FLOWCTL;
171
172 chan->state = BT_BOUND;
173 sk->sk_state = BT_BOUND;
174
175done:
176 release_sock(sk);
177 return err;
178}
179
180static void l2cap_sock_init_pid(struct sock *sk)
181{
182 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
183
184 /* Only L2CAP_MODE_EXT_FLOWCTL ever need to access the PID in order to
185 * group the channels being requested.
186 */
187 if (chan->mode != L2CAP_MODE_EXT_FLOWCTL)
188 return;
189
190 spin_lock(&sk->sk_peer_lock);
191 sk->sk_peer_pid = get_pid(task_tgid(current));
192 spin_unlock(&sk->sk_peer_lock);
193}
194
195static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
196 int alen, int flags)
197{
198 struct sock *sk = sock->sk;
199 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
200 struct sockaddr_l2 la;
201 int len, err = 0;
202 bool zapped;
203
204 BT_DBG("sk %p", sk);
205
206 lock_sock(sk);
207 zapped = sock_flag(sk, SOCK_ZAPPED);
208 release_sock(sk);
209
210 if (zapped)
211 return -EINVAL;
212
213 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
214 addr->sa_family != AF_BLUETOOTH)
215 return -EINVAL;
216
217 memset(&la, 0, sizeof(la));
218 len = min_t(unsigned int, sizeof(la), alen);
219 memcpy(&la, addr, len);
220
221 if (la.l2_cid && la.l2_psm)
222 return -EINVAL;
223
224 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
225 return -EINVAL;
226
227 /* Check that the socket wasn't bound to something that
228 * conflicts with the address given to connect(). If chan->src
229 * is BDADDR_ANY it means bind() was never used, in which case
230 * chan->src_type and la.l2_bdaddr_type do not need to match.
231 */
232 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
233 bdaddr_type_is_le(la.l2_bdaddr_type)) {
234 /* Old user space versions will try to incorrectly bind
235 * the ATT socket using BDADDR_BREDR. We need to accept
236 * this and fix up the source address type only when
237 * both the source CID and destination CID indicate
238 * ATT. Anything else is an invalid combination.
239 */
240 if (chan->scid != L2CAP_CID_ATT ||
241 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
242 return -EINVAL;
243
244 /* We don't have the hdev available here to make a
245 * better decision on random vs public, but since all
246 * user space versions that exhibit this issue anyway do
247 * not support random local addresses assuming public
248 * here is good enough.
249 */
250 chan->src_type = BDADDR_LE_PUBLIC;
251 }
252
253 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
254 return -EINVAL;
255
256 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
257 /* We only allow ATT user space socket */
258 if (la.l2_cid &&
259 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
260 return -EINVAL;
261 }
262
263 /* Use L2CAP_MODE_LE_FLOWCTL (CoC) in case of LE address and
264 * L2CAP_MODE_EXT_FLOWCTL (ECRED) has not been set.
265 */
266 if (chan->psm && bdaddr_type_is_le(chan->src_type) &&
267 chan->mode != L2CAP_MODE_EXT_FLOWCTL)
268 chan->mode = L2CAP_MODE_LE_FLOWCTL;
269
270 l2cap_sock_init_pid(sk);
271
272 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
273 &la.l2_bdaddr, la.l2_bdaddr_type);
274 if (err)
275 return err;
276
277 lock_sock(sk);
278
279 err = bt_sock_wait_state(sk, BT_CONNECTED,
280 sock_sndtimeo(sk, flags & O_NONBLOCK));
281
282 release_sock(sk);
283
284 return err;
285}
286
287static int l2cap_sock_listen(struct socket *sock, int backlog)
288{
289 struct sock *sk = sock->sk;
290 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
291 int err = 0;
292
293 BT_DBG("sk %p backlog %d", sk, backlog);
294
295 lock_sock(sk);
296
297 if (sk->sk_state != BT_BOUND) {
298 err = -EBADFD;
299 goto done;
300 }
301
302 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
303 err = -EINVAL;
304 goto done;
305 }
306
307 switch (chan->mode) {
308 case L2CAP_MODE_BASIC:
309 case L2CAP_MODE_LE_FLOWCTL:
310 break;
311 case L2CAP_MODE_EXT_FLOWCTL:
312 if (!enable_ecred) {
313 err = -EOPNOTSUPP;
314 goto done;
315 }
316 break;
317 case L2CAP_MODE_ERTM:
318 case L2CAP_MODE_STREAMING:
319 if (!disable_ertm)
320 break;
321 fallthrough;
322 default:
323 err = -EOPNOTSUPP;
324 goto done;
325 }
326
327 l2cap_sock_init_pid(sk);
328
329 sk->sk_max_ack_backlog = backlog;
330 sk->sk_ack_backlog = 0;
331
332 /* Listening channels need to use nested locking in order not to
333 * cause lockdep warnings when the created child channels end up
334 * being locked in the same thread as the parent channel.
335 */
336 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
337
338 chan->state = BT_LISTEN;
339 sk->sk_state = BT_LISTEN;
340
341done:
342 release_sock(sk);
343 return err;
344}
345
346static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
347 int flags, bool kern)
348{
349 DEFINE_WAIT_FUNC(wait, woken_wake_function);
350 struct sock *sk = sock->sk, *nsk;
351 long timeo;
352 int err = 0;
353
354 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
355
356 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
357
358 BT_DBG("sk %p timeo %ld", sk, timeo);
359
360 /* Wait for an incoming connection. (wake-one). */
361 add_wait_queue_exclusive(sk_sleep(sk), &wait);
362 while (1) {
363 if (sk->sk_state != BT_LISTEN) {
364 err = -EBADFD;
365 break;
366 }
367
368 nsk = bt_accept_dequeue(sk, newsock);
369 if (nsk)
370 break;
371
372 if (!timeo) {
373 err = -EAGAIN;
374 break;
375 }
376
377 if (signal_pending(current)) {
378 err = sock_intr_errno(timeo);
379 break;
380 }
381
382 release_sock(sk);
383
384 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
385
386 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
387 }
388 remove_wait_queue(sk_sleep(sk), &wait);
389
390 if (err)
391 goto done;
392
393 newsock->state = SS_CONNECTED;
394
395 BT_DBG("new socket %p", nsk);
396
397done:
398 release_sock(sk);
399 return err;
400}
401
402static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
403 int peer)
404{
405 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
406 struct sock *sk = sock->sk;
407 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
408
409 BT_DBG("sock %p, sk %p", sock, sk);
410
411 if (peer && sk->sk_state != BT_CONNECTED &&
412 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 &&
413 sk->sk_state != BT_CONFIG)
414 return -ENOTCONN;
415
416 memset(la, 0, sizeof(struct sockaddr_l2));
417 addr->sa_family = AF_BLUETOOTH;
418
419 la->l2_psm = chan->psm;
420
421 if (peer) {
422 bacpy(&la->l2_bdaddr, &chan->dst);
423 la->l2_cid = cpu_to_le16(chan->dcid);
424 la->l2_bdaddr_type = chan->dst_type;
425 } else {
426 bacpy(&la->l2_bdaddr, &chan->src);
427 la->l2_cid = cpu_to_le16(chan->scid);
428 la->l2_bdaddr_type = chan->src_type;
429 }
430
431 return sizeof(struct sockaddr_l2);
432}
433
434static int l2cap_get_mode(struct l2cap_chan *chan)
435{
436 switch (chan->mode) {
437 case L2CAP_MODE_BASIC:
438 return BT_MODE_BASIC;
439 case L2CAP_MODE_ERTM:
440 return BT_MODE_ERTM;
441 case L2CAP_MODE_STREAMING:
442 return BT_MODE_STREAMING;
443 case L2CAP_MODE_LE_FLOWCTL:
444 return BT_MODE_LE_FLOWCTL;
445 case L2CAP_MODE_EXT_FLOWCTL:
446 return BT_MODE_EXT_FLOWCTL;
447 }
448
449 return -EINVAL;
450}
451
452static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
453 char __user *optval, int __user *optlen)
454{
455 struct sock *sk = sock->sk;
456 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
457 struct l2cap_options opts;
458 struct l2cap_conninfo cinfo;
459 int len, err = 0;
460 u32 opt;
461
462 BT_DBG("sk %p", sk);
463
464 if (get_user(len, optlen))
465 return -EFAULT;
466
467 lock_sock(sk);
468
469 switch (optname) {
470 case L2CAP_OPTIONS:
471 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
472 * legacy ATT code depends on getsockopt for
473 * L2CAP_OPTIONS we need to let this pass.
474 */
475 if (bdaddr_type_is_le(chan->src_type) &&
476 chan->scid != L2CAP_CID_ATT) {
477 err = -EINVAL;
478 break;
479 }
480
481 /* Only BR/EDR modes are supported here */
482 switch (chan->mode) {
483 case L2CAP_MODE_BASIC:
484 case L2CAP_MODE_ERTM:
485 case L2CAP_MODE_STREAMING:
486 break;
487 default:
488 err = -EINVAL;
489 break;
490 }
491
492 if (err < 0)
493 break;
494
495 memset(&opts, 0, sizeof(opts));
496 opts.imtu = chan->imtu;
497 opts.omtu = chan->omtu;
498 opts.flush_to = chan->flush_to;
499 opts.mode = chan->mode;
500 opts.fcs = chan->fcs;
501 opts.max_tx = chan->max_tx;
502 opts.txwin_size = chan->tx_win;
503
504 BT_DBG("mode 0x%2.2x", chan->mode);
505
506 len = min_t(unsigned int, len, sizeof(opts));
507 if (copy_to_user(optval, (char *) &opts, len))
508 err = -EFAULT;
509
510 break;
511
512 case L2CAP_LM:
513 switch (chan->sec_level) {
514 case BT_SECURITY_LOW:
515 opt = L2CAP_LM_AUTH;
516 break;
517 case BT_SECURITY_MEDIUM:
518 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
519 break;
520 case BT_SECURITY_HIGH:
521 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
522 L2CAP_LM_SECURE;
523 break;
524 case BT_SECURITY_FIPS:
525 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
526 L2CAP_LM_SECURE | L2CAP_LM_FIPS;
527 break;
528 default:
529 opt = 0;
530 break;
531 }
532
533 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
534 opt |= L2CAP_LM_MASTER;
535
536 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
537 opt |= L2CAP_LM_RELIABLE;
538
539 if (put_user(opt, (u32 __user *) optval))
540 err = -EFAULT;
541
542 break;
543
544 case L2CAP_CONNINFO:
545 if (sk->sk_state != BT_CONNECTED &&
546 !(sk->sk_state == BT_CONNECT2 &&
547 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
548 err = -ENOTCONN;
549 break;
550 }
551
552 memset(&cinfo, 0, sizeof(cinfo));
553 cinfo.hci_handle = chan->conn->hcon->handle;
554 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
555
556 len = min_t(unsigned int, len, sizeof(cinfo));
557 if (copy_to_user(optval, (char *) &cinfo, len))
558 err = -EFAULT;
559
560 break;
561
562 default:
563 err = -ENOPROTOOPT;
564 break;
565 }
566
567 release_sock(sk);
568 return err;
569}
570
571static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
572 char __user *optval, int __user *optlen)
573{
574 struct sock *sk = sock->sk;
575 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
576 struct bt_security sec;
577 struct bt_power pwr;
578 u32 phys;
579 int len, mode, err = 0;
580
581 BT_DBG("sk %p", sk);
582
583 if (level == SOL_L2CAP)
584 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
585
586 if (level != SOL_BLUETOOTH)
587 return -ENOPROTOOPT;
588
589 if (get_user(len, optlen))
590 return -EFAULT;
591
592 lock_sock(sk);
593
594 switch (optname) {
595 case BT_SECURITY:
596 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
597 chan->chan_type != L2CAP_CHAN_FIXED &&
598 chan->chan_type != L2CAP_CHAN_RAW) {
599 err = -EINVAL;
600 break;
601 }
602
603 memset(&sec, 0, sizeof(sec));
604 if (chan->conn) {
605 sec.level = chan->conn->hcon->sec_level;
606
607 if (sk->sk_state == BT_CONNECTED)
608 sec.key_size = chan->conn->hcon->enc_key_size;
609 } else {
610 sec.level = chan->sec_level;
611 }
612
613 len = min_t(unsigned int, len, sizeof(sec));
614 if (copy_to_user(optval, (char *) &sec, len))
615 err = -EFAULT;
616
617 break;
618
619 case BT_DEFER_SETUP:
620 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
621 err = -EINVAL;
622 break;
623 }
624
625 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
626 (u32 __user *) optval))
627 err = -EFAULT;
628
629 break;
630
631 case BT_FLUSHABLE:
632 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
633 (u32 __user *) optval))
634 err = -EFAULT;
635
636 break;
637
638 case BT_POWER:
639 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
640 && sk->sk_type != SOCK_RAW) {
641 err = -EINVAL;
642 break;
643 }
644
645 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
646
647 len = min_t(unsigned int, len, sizeof(pwr));
648 if (copy_to_user(optval, (char *) &pwr, len))
649 err = -EFAULT;
650
651 break;
652
653 case BT_CHANNEL_POLICY:
654 if (put_user(chan->chan_policy, (u32 __user *) optval))
655 err = -EFAULT;
656 break;
657
658 case BT_SNDMTU:
659 if (!bdaddr_type_is_le(chan->src_type)) {
660 err = -EINVAL;
661 break;
662 }
663
664 if (sk->sk_state != BT_CONNECTED) {
665 err = -ENOTCONN;
666 break;
667 }
668
669 if (put_user(chan->omtu, (u16 __user *) optval))
670 err = -EFAULT;
671 break;
672
673 case BT_RCVMTU:
674 if (!bdaddr_type_is_le(chan->src_type)) {
675 err = -EINVAL;
676 break;
677 }
678
679 if (put_user(chan->imtu, (u16 __user *) optval))
680 err = -EFAULT;
681 break;
682
683 case BT_PHY:
684 if (sk->sk_state != BT_CONNECTED) {
685 err = -ENOTCONN;
686 break;
687 }
688
689 phys = hci_conn_get_phy(chan->conn->hcon);
690
691 if (put_user(phys, (u32 __user *) optval))
692 err = -EFAULT;
693 break;
694
695 case BT_MODE:
696 if (!enable_ecred) {
697 err = -ENOPROTOOPT;
698 break;
699 }
700
701 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
702 err = -EINVAL;
703 break;
704 }
705
706 mode = l2cap_get_mode(chan);
707 if (mode < 0) {
708 err = mode;
709 break;
710 }
711
712 if (put_user(mode, (u8 __user *) optval))
713 err = -EFAULT;
714 break;
715
716 default:
717 err = -ENOPROTOOPT;
718 break;
719 }
720
721 release_sock(sk);
722 return err;
723}
724
725static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
726{
727 switch (chan->scid) {
728 case L2CAP_CID_ATT:
729 if (mtu < L2CAP_LE_MIN_MTU)
730 return false;
731 break;
732
733 default:
734 if (mtu < L2CAP_DEFAULT_MIN_MTU)
735 return false;
736 }
737
738 return true;
739}
740
741static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
742 sockptr_t optval, unsigned int optlen)
743{
744 struct sock *sk = sock->sk;
745 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
746 struct l2cap_options opts;
747 int len, err = 0;
748 u32 opt;
749
750 BT_DBG("sk %p", sk);
751
752 lock_sock(sk);
753
754 switch (optname) {
755 case L2CAP_OPTIONS:
756 if (bdaddr_type_is_le(chan->src_type)) {
757 err = -EINVAL;
758 break;
759 }
760
761 if (sk->sk_state == BT_CONNECTED) {
762 err = -EINVAL;
763 break;
764 }
765
766 opts.imtu = chan->imtu;
767 opts.omtu = chan->omtu;
768 opts.flush_to = chan->flush_to;
769 opts.mode = chan->mode;
770 opts.fcs = chan->fcs;
771 opts.max_tx = chan->max_tx;
772 opts.txwin_size = chan->tx_win;
773
774 len = min_t(unsigned int, sizeof(opts), optlen);
775 if (copy_from_sockptr(&opts, optval, len)) {
776 err = -EFAULT;
777 break;
778 }
779
780 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
781 err = -EINVAL;
782 break;
783 }
784
785 if (!l2cap_valid_mtu(chan, opts.imtu)) {
786 err = -EINVAL;
787 break;
788 }
789
790 /* Only BR/EDR modes are supported here */
791 switch (opts.mode) {
792 case L2CAP_MODE_BASIC:
793 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
794 break;
795 case L2CAP_MODE_ERTM:
796 case L2CAP_MODE_STREAMING:
797 if (!disable_ertm)
798 break;
799 fallthrough;
800 default:
801 err = -EINVAL;
802 break;
803 }
804
805 if (err < 0)
806 break;
807
808 chan->mode = opts.mode;
809
810 BT_DBG("mode 0x%2.2x", chan->mode);
811
812 chan->imtu = opts.imtu;
813 chan->omtu = opts.omtu;
814 chan->fcs = opts.fcs;
815 chan->max_tx = opts.max_tx;
816 chan->tx_win = opts.txwin_size;
817 chan->flush_to = opts.flush_to;
818 break;
819
820 case L2CAP_LM:
821 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
822 err = -EFAULT;
823 break;
824 }
825
826 if (opt & L2CAP_LM_FIPS) {
827 err = -EINVAL;
828 break;
829 }
830
831 if (opt & L2CAP_LM_AUTH)
832 chan->sec_level = BT_SECURITY_LOW;
833 if (opt & L2CAP_LM_ENCRYPT)
834 chan->sec_level = BT_SECURITY_MEDIUM;
835 if (opt & L2CAP_LM_SECURE)
836 chan->sec_level = BT_SECURITY_HIGH;
837
838 if (opt & L2CAP_LM_MASTER)
839 set_bit(FLAG_ROLE_SWITCH, &chan->flags);
840 else
841 clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
842
843 if (opt & L2CAP_LM_RELIABLE)
844 set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
845 else
846 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
847 break;
848
849 default:
850 err = -ENOPROTOOPT;
851 break;
852 }
853
854 release_sock(sk);
855 return err;
856}
857
858static int l2cap_set_mode(struct l2cap_chan *chan, u8 mode)
859{
860 switch (mode) {
861 case BT_MODE_BASIC:
862 if (bdaddr_type_is_le(chan->src_type))
863 return -EINVAL;
864 mode = L2CAP_MODE_BASIC;
865 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
866 break;
867 case BT_MODE_ERTM:
868 if (!disable_ertm || bdaddr_type_is_le(chan->src_type))
869 return -EINVAL;
870 mode = L2CAP_MODE_ERTM;
871 break;
872 case BT_MODE_STREAMING:
873 if (!disable_ertm || bdaddr_type_is_le(chan->src_type))
874 return -EINVAL;
875 mode = L2CAP_MODE_STREAMING;
876 break;
877 case BT_MODE_LE_FLOWCTL:
878 if (!bdaddr_type_is_le(chan->src_type))
879 return -EINVAL;
880 mode = L2CAP_MODE_LE_FLOWCTL;
881 break;
882 case BT_MODE_EXT_FLOWCTL:
883 /* TODO: Add support for ECRED PDUs to BR/EDR */
884 if (!bdaddr_type_is_le(chan->src_type))
885 return -EINVAL;
886 mode = L2CAP_MODE_EXT_FLOWCTL;
887 break;
888 default:
889 return -EINVAL;
890 }
891
892 chan->mode = mode;
893
894 return 0;
895}
896
897static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
898 sockptr_t optval, unsigned int optlen)
899{
900 struct sock *sk = sock->sk;
901 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
902 struct bt_security sec;
903 struct bt_power pwr;
904 struct l2cap_conn *conn;
905 int len, err = 0;
906 u32 opt;
907 u16 mtu;
908 u8 mode;
909
910 BT_DBG("sk %p", sk);
911
912 if (level == SOL_L2CAP)
913 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
914
915 if (level != SOL_BLUETOOTH)
916 return -ENOPROTOOPT;
917
918 lock_sock(sk);
919
920 switch (optname) {
921 case BT_SECURITY:
922 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
923 chan->chan_type != L2CAP_CHAN_FIXED &&
924 chan->chan_type != L2CAP_CHAN_RAW) {
925 err = -EINVAL;
926 break;
927 }
928
929 sec.level = BT_SECURITY_LOW;
930
931 len = min_t(unsigned int, sizeof(sec), optlen);
932 if (copy_from_sockptr(&sec, optval, len)) {
933 err = -EFAULT;
934 break;
935 }
936
937 if (sec.level < BT_SECURITY_LOW ||
938 sec.level > BT_SECURITY_FIPS) {
939 err = -EINVAL;
940 break;
941 }
942
943 chan->sec_level = sec.level;
944
945 if (!chan->conn)
946 break;
947
948 conn = chan->conn;
949
950 /* change security for LE channels */
951 if (chan->scid == L2CAP_CID_ATT) {
952 if (smp_conn_security(conn->hcon, sec.level)) {
953 err = -EINVAL;
954 break;
955 }
956
957 set_bit(FLAG_PENDING_SECURITY, &chan->flags);
958 sk->sk_state = BT_CONFIG;
959 chan->state = BT_CONFIG;
960
961 /* or for ACL link */
962 } else if ((sk->sk_state == BT_CONNECT2 &&
963 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
964 sk->sk_state == BT_CONNECTED) {
965 if (!l2cap_chan_check_security(chan, true))
966 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
967 else
968 sk->sk_state_change(sk);
969 } else {
970 err = -EINVAL;
971 }
972 break;
973
974 case BT_DEFER_SETUP:
975 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
976 err = -EINVAL;
977 break;
978 }
979
980 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
981 err = -EFAULT;
982 break;
983 }
984
985 if (opt) {
986 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
987 set_bit(FLAG_DEFER_SETUP, &chan->flags);
988 } else {
989 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
990 clear_bit(FLAG_DEFER_SETUP, &chan->flags);
991 }
992 break;
993
994 case BT_FLUSHABLE:
995 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
996 err = -EFAULT;
997 break;
998 }
999
1000 if (opt > BT_FLUSHABLE_ON) {
1001 err = -EINVAL;
1002 break;
1003 }
1004
1005 if (opt == BT_FLUSHABLE_OFF) {
1006 conn = chan->conn;
1007 /* proceed further only when we have l2cap_conn and
1008 No Flush support in the LM */
1009 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
1010 err = -EINVAL;
1011 break;
1012 }
1013 }
1014
1015 if (opt)
1016 set_bit(FLAG_FLUSHABLE, &chan->flags);
1017 else
1018 clear_bit(FLAG_FLUSHABLE, &chan->flags);
1019 break;
1020
1021 case BT_POWER:
1022 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
1023 chan->chan_type != L2CAP_CHAN_RAW) {
1024 err = -EINVAL;
1025 break;
1026 }
1027
1028 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
1029
1030 len = min_t(unsigned int, sizeof(pwr), optlen);
1031 if (copy_from_sockptr(&pwr, optval, len)) {
1032 err = -EFAULT;
1033 break;
1034 }
1035
1036 if (pwr.force_active)
1037 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1038 else
1039 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1040 break;
1041
1042 case BT_CHANNEL_POLICY:
1043 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
1044 err = -EFAULT;
1045 break;
1046 }
1047
1048 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
1049 err = -EINVAL;
1050 break;
1051 }
1052
1053 if (chan->mode != L2CAP_MODE_ERTM &&
1054 chan->mode != L2CAP_MODE_STREAMING) {
1055 err = -EOPNOTSUPP;
1056 break;
1057 }
1058
1059 chan->chan_policy = (u8) opt;
1060
1061 if (sk->sk_state == BT_CONNECTED &&
1062 chan->move_role == L2CAP_MOVE_ROLE_NONE)
1063 l2cap_move_start(chan);
1064
1065 break;
1066
1067 case BT_SNDMTU:
1068 if (!bdaddr_type_is_le(chan->src_type)) {
1069 err = -EINVAL;
1070 break;
1071 }
1072
1073 /* Setting is not supported as it's the remote side that
1074 * decides this.
1075 */
1076 err = -EPERM;
1077 break;
1078
1079 case BT_RCVMTU:
1080 if (!bdaddr_type_is_le(chan->src_type)) {
1081 err = -EINVAL;
1082 break;
1083 }
1084
1085 if (chan->mode == L2CAP_MODE_LE_FLOWCTL &&
1086 sk->sk_state == BT_CONNECTED) {
1087 err = -EISCONN;
1088 break;
1089 }
1090
1091 if (copy_from_sockptr(&mtu, optval, sizeof(u16))) {
1092 err = -EFAULT;
1093 break;
1094 }
1095
1096 if (chan->mode == L2CAP_MODE_EXT_FLOWCTL &&
1097 sk->sk_state == BT_CONNECTED)
1098 err = l2cap_chan_reconfigure(chan, mtu);
1099 else
1100 chan->imtu = mtu;
1101
1102 break;
1103
1104 case BT_MODE:
1105 if (!enable_ecred) {
1106 err = -ENOPROTOOPT;
1107 break;
1108 }
1109
1110 BT_DBG("sk->sk_state %u", sk->sk_state);
1111
1112 if (sk->sk_state != BT_BOUND) {
1113 err = -EINVAL;
1114 break;
1115 }
1116
1117 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1118 err = -EINVAL;
1119 break;
1120 }
1121
1122 if (copy_from_sockptr(&mode, optval, sizeof(u8))) {
1123 err = -EFAULT;
1124 break;
1125 }
1126
1127 BT_DBG("mode %u", mode);
1128
1129 err = l2cap_set_mode(chan, mode);
1130 if (err)
1131 break;
1132
1133 BT_DBG("mode 0x%2.2x", chan->mode);
1134
1135 break;
1136
1137 default:
1138 err = -ENOPROTOOPT;
1139 break;
1140 }
1141
1142 release_sock(sk);
1143 return err;
1144}
1145
1146static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1147 size_t len)
1148{
1149 struct sock *sk = sock->sk;
1150 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1151 int err;
1152
1153 BT_DBG("sock %p, sk %p", sock, sk);
1154
1155 err = sock_error(sk);
1156 if (err)
1157 return err;
1158
1159 if (msg->msg_flags & MSG_OOB)
1160 return -EOPNOTSUPP;
1161
1162 if (sk->sk_state != BT_CONNECTED)
1163 return -ENOTCONN;
1164
1165 lock_sock(sk);
1166 err = bt_sock_wait_ready(sk, msg->msg_flags);
1167 release_sock(sk);
1168 if (err)
1169 return err;
1170
1171 l2cap_chan_lock(chan);
1172 err = l2cap_chan_send(chan, msg, len);
1173 l2cap_chan_unlock(chan);
1174
1175 return err;
1176}
1177
1178static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1179 size_t len, int flags)
1180{
1181 struct sock *sk = sock->sk;
1182 struct l2cap_pinfo *pi = l2cap_pi(sk);
1183 int err;
1184
1185 lock_sock(sk);
1186
1187 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
1188 &bt_sk(sk)->flags)) {
1189 if (pi->chan->mode == L2CAP_MODE_EXT_FLOWCTL) {
1190 sk->sk_state = BT_CONNECTED;
1191 pi->chan->state = BT_CONNECTED;
1192 __l2cap_ecred_conn_rsp_defer(pi->chan);
1193 } else if (bdaddr_type_is_le(pi->chan->src_type)) {
1194 sk->sk_state = BT_CONNECTED;
1195 pi->chan->state = BT_CONNECTED;
1196 __l2cap_le_connect_rsp_defer(pi->chan);
1197 } else {
1198 sk->sk_state = BT_CONFIG;
1199 pi->chan->state = BT_CONFIG;
1200 __l2cap_connect_rsp_defer(pi->chan);
1201 }
1202
1203 err = 0;
1204 goto done;
1205 }
1206
1207 release_sock(sk);
1208
1209 if (sock->type == SOCK_STREAM)
1210 err = bt_sock_stream_recvmsg(sock, msg, len, flags);
1211 else
1212 err = bt_sock_recvmsg(sock, msg, len, flags);
1213
1214 if (pi->chan->mode != L2CAP_MODE_ERTM)
1215 return err;
1216
1217 /* Attempt to put pending rx data in the socket buffer */
1218
1219 lock_sock(sk);
1220
1221 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
1222 goto done;
1223
1224 if (pi->rx_busy_skb) {
1225 if (!__sock_queue_rcv_skb(sk, pi->rx_busy_skb))
1226 pi->rx_busy_skb = NULL;
1227 else
1228 goto done;
1229 }
1230
1231 /* Restore data flow when half of the receive buffer is
1232 * available. This avoids resending large numbers of
1233 * frames.
1234 */
1235 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1236 l2cap_chan_busy(pi->chan, 0);
1237
1238done:
1239 release_sock(sk);
1240 return err;
1241}
1242
1243/* Kill socket (only if zapped and orphan)
1244 * Must be called on unlocked socket, with l2cap channel lock.
1245 */
1246static void l2cap_sock_kill(struct sock *sk)
1247{
1248 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1249 return;
1250
1251 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
1252
1253 /* Kill poor orphan */
1254
1255 l2cap_chan_put(l2cap_pi(sk)->chan);
1256 sock_set_flag(sk, SOCK_DEAD);
1257 sock_put(sk);
1258}
1259
1260static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
1261{
1262 DECLARE_WAITQUEUE(wait, current);
1263 int err = 0;
1264 int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1265 /* Timeout to prevent infinite loop */
1266 unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
1267
1268 add_wait_queue(sk_sleep(sk), &wait);
1269 set_current_state(TASK_INTERRUPTIBLE);
1270 do {
1271 BT_DBG("Waiting for %d ACKs, timeout %04d ms",
1272 chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
1273 jiffies_to_msecs(timeout - jiffies));
1274
1275 if (!timeo)
1276 timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1277
1278 if (signal_pending(current)) {
1279 err = sock_intr_errno(timeo);
1280 break;
1281 }
1282
1283 release_sock(sk);
1284 timeo = schedule_timeout(timeo);
1285 lock_sock(sk);
1286 set_current_state(TASK_INTERRUPTIBLE);
1287
1288 err = sock_error(sk);
1289 if (err)
1290 break;
1291
1292 if (time_after(jiffies, timeout)) {
1293 err = -ENOLINK;
1294 break;
1295 }
1296
1297 } while (chan->unacked_frames > 0 &&
1298 chan->state == BT_CONNECTED);
1299
1300 set_current_state(TASK_RUNNING);
1301 remove_wait_queue(sk_sleep(sk), &wait);
1302 return err;
1303}
1304
1305static int l2cap_sock_shutdown(struct socket *sock, int how)
1306{
1307 struct sock *sk = sock->sk;
1308 struct l2cap_chan *chan;
1309 struct l2cap_conn *conn;
1310 int err = 0;
1311
1312 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1313
1314 /* 'how' parameter is mapped to sk_shutdown as follows:
1315 * SHUT_RD (0) --> RCV_SHUTDOWN (1)
1316 * SHUT_WR (1) --> SEND_SHUTDOWN (2)
1317 * SHUT_RDWR (2) --> SHUTDOWN_MASK (3)
1318 */
1319 how++;
1320
1321 if (!sk)
1322 return 0;
1323
1324 lock_sock(sk);
1325
1326 if ((sk->sk_shutdown & how) == how)
1327 goto shutdown_already;
1328
1329 BT_DBG("Handling sock shutdown");
1330
1331 /* prevent sk structure from being freed whilst unlocked */
1332 sock_hold(sk);
1333
1334 chan = l2cap_pi(sk)->chan;
1335 /* prevent chan structure from being freed whilst unlocked */
1336 l2cap_chan_hold(chan);
1337
1338 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1339
1340 if (chan->mode == L2CAP_MODE_ERTM &&
1341 chan->unacked_frames > 0 &&
1342 chan->state == BT_CONNECTED) {
1343 err = __l2cap_wait_ack(sk, chan);
1344
1345 /* After waiting for ACKs, check whether shutdown
1346 * has already been actioned to close the L2CAP
1347 * link such as by l2cap_disconnection_req().
1348 */
1349 if ((sk->sk_shutdown & how) == how)
1350 goto shutdown_matched;
1351 }
1352
1353 /* Try setting the RCV_SHUTDOWN bit, return early if SEND_SHUTDOWN
1354 * is already set
1355 */
1356 if ((how & RCV_SHUTDOWN) && !(sk->sk_shutdown & RCV_SHUTDOWN)) {
1357 sk->sk_shutdown |= RCV_SHUTDOWN;
1358 if ((sk->sk_shutdown & how) == how)
1359 goto shutdown_matched;
1360 }
1361
1362 sk->sk_shutdown |= SEND_SHUTDOWN;
1363 release_sock(sk);
1364
1365 l2cap_chan_lock(chan);
1366 conn = chan->conn;
1367 if (conn)
1368 /* prevent conn structure from being freed */
1369 l2cap_conn_get(conn);
1370 l2cap_chan_unlock(chan);
1371
1372 if (conn)
1373 /* mutex lock must be taken before l2cap_chan_lock() */
1374 mutex_lock(&conn->chan_lock);
1375
1376 l2cap_chan_lock(chan);
1377 l2cap_chan_close(chan, 0);
1378 l2cap_chan_unlock(chan);
1379
1380 if (conn) {
1381 mutex_unlock(&conn->chan_lock);
1382 l2cap_conn_put(conn);
1383 }
1384
1385 lock_sock(sk);
1386
1387 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1388 !(current->flags & PF_EXITING))
1389 err = bt_sock_wait_state(sk, BT_CLOSED,
1390 sk->sk_lingertime);
1391
1392shutdown_matched:
1393 l2cap_chan_put(chan);
1394 sock_put(sk);
1395
1396shutdown_already:
1397 if (!err && sk->sk_err)
1398 err = -sk->sk_err;
1399
1400 release_sock(sk);
1401
1402 BT_DBG("Sock shutdown complete err: %d", err);
1403
1404 return err;
1405}
1406
1407static int l2cap_sock_release(struct socket *sock)
1408{
1409 struct sock *sk = sock->sk;
1410 int err;
1411 struct l2cap_chan *chan;
1412
1413 BT_DBG("sock %p, sk %p", sock, sk);
1414
1415 if (!sk)
1416 return 0;
1417
1418 bt_sock_unlink(&l2cap_sk_list, sk);
1419
1420 err = l2cap_sock_shutdown(sock, SHUT_RDWR);
1421 chan = l2cap_pi(sk)->chan;
1422
1423 l2cap_chan_hold(chan);
1424 l2cap_chan_lock(chan);
1425
1426 sock_orphan(sk);
1427 l2cap_sock_kill(sk);
1428
1429 l2cap_chan_unlock(chan);
1430 l2cap_chan_put(chan);
1431
1432 return err;
1433}
1434
1435static void l2cap_sock_cleanup_listen(struct sock *parent)
1436{
1437 struct sock *sk;
1438
1439 BT_DBG("parent %p state %s", parent,
1440 state_to_string(parent->sk_state));
1441
1442 /* Close not yet accepted channels */
1443 while ((sk = bt_accept_dequeue(parent, NULL))) {
1444 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1445
1446 BT_DBG("child chan %p state %s", chan,
1447 state_to_string(chan->state));
1448
1449 l2cap_chan_hold(chan);
1450 l2cap_chan_lock(chan);
1451
1452 __clear_chan_timer(chan);
1453 l2cap_chan_close(chan, ECONNRESET);
1454 l2cap_sock_kill(sk);
1455
1456 l2cap_chan_unlock(chan);
1457 l2cap_chan_put(chan);
1458 }
1459}
1460
1461static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1462{
1463 struct sock *sk, *parent = chan->data;
1464
1465 lock_sock(parent);
1466
1467 /* Check for backlog size */
1468 if (sk_acceptq_is_full(parent)) {
1469 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1470 release_sock(parent);
1471 return NULL;
1472 }
1473
1474 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1475 GFP_ATOMIC, 0);
1476 if (!sk) {
1477 release_sock(parent);
1478 return NULL;
1479 }
1480
1481 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1482
1483 l2cap_sock_init(sk, parent);
1484
1485 bt_accept_enqueue(parent, sk, false);
1486
1487 release_sock(parent);
1488
1489 return l2cap_pi(sk)->chan;
1490}
1491
1492static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1493{
1494 struct sock *sk = chan->data;
1495 int err;
1496
1497 lock_sock(sk);
1498
1499 if (l2cap_pi(sk)->rx_busy_skb) {
1500 err = -ENOMEM;
1501 goto done;
1502 }
1503
1504 if (chan->mode != L2CAP_MODE_ERTM &&
1505 chan->mode != L2CAP_MODE_STREAMING) {
1506 /* Even if no filter is attached, we could potentially
1507 * get errors from security modules, etc.
1508 */
1509 err = sk_filter(sk, skb);
1510 if (err)
1511 goto done;
1512 }
1513
1514 err = __sock_queue_rcv_skb(sk, skb);
1515
1516 /* For ERTM, handle one skb that doesn't fit into the recv
1517 * buffer. This is important to do because the data frames
1518 * have already been acked, so the skb cannot be discarded.
1519 *
1520 * Notify the l2cap core that the buffer is full, so the
1521 * LOCAL_BUSY state is entered and no more frames are
1522 * acked and reassembled until there is buffer space
1523 * available.
1524 */
1525 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1526 l2cap_pi(sk)->rx_busy_skb = skb;
1527 l2cap_chan_busy(chan, 1);
1528 err = 0;
1529 }
1530
1531done:
1532 release_sock(sk);
1533
1534 return err;
1535}
1536
1537static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1538{
1539 struct sock *sk = chan->data;
1540
1541 if (!sk)
1542 return;
1543
1544 l2cap_sock_kill(sk);
1545}
1546
1547static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1548{
1549 struct sock *sk = chan->data;
1550 struct sock *parent;
1551
1552 if (!sk)
1553 return;
1554
1555 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1556
1557 /* This callback can be called both for server (BT_LISTEN)
1558 * sockets as well as "normal" ones. To avoid lockdep warnings
1559 * with child socket locking (through l2cap_sock_cleanup_listen)
1560 * we need separation into separate nesting levels. The simplest
1561 * way to accomplish this is to inherit the nesting level used
1562 * for the channel.
1563 */
1564 lock_sock_nested(sk, atomic_read(&chan->nesting));
1565
1566 parent = bt_sk(sk)->parent;
1567
1568 switch (chan->state) {
1569 case BT_OPEN:
1570 case BT_BOUND:
1571 case BT_CLOSED:
1572 break;
1573 case BT_LISTEN:
1574 l2cap_sock_cleanup_listen(sk);
1575 sk->sk_state = BT_CLOSED;
1576 chan->state = BT_CLOSED;
1577
1578 break;
1579 default:
1580 sk->sk_state = BT_CLOSED;
1581 chan->state = BT_CLOSED;
1582
1583 sk->sk_err = err;
1584
1585 if (parent) {
1586 bt_accept_unlink(sk);
1587 parent->sk_data_ready(parent);
1588 } else {
1589 sk->sk_state_change(sk);
1590 }
1591
1592 break;
1593 }
1594 release_sock(sk);
1595
1596 /* Only zap after cleanup to avoid use after free race */
1597 sock_set_flag(sk, SOCK_ZAPPED);
1598
1599}
1600
1601static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1602 int err)
1603{
1604 struct sock *sk = chan->data;
1605
1606 sk->sk_state = state;
1607
1608 if (err)
1609 sk->sk_err = err;
1610}
1611
1612static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1613 unsigned long hdr_len,
1614 unsigned long len, int nb)
1615{
1616 struct sock *sk = chan->data;
1617 struct sk_buff *skb;
1618 int err;
1619
1620 l2cap_chan_unlock(chan);
1621 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1622 l2cap_chan_lock(chan);
1623
1624 if (!skb)
1625 return ERR_PTR(err);
1626
1627 skb->priority = sk->sk_priority;
1628
1629 bt_cb(skb)->l2cap.chan = chan;
1630
1631 return skb;
1632}
1633
1634static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1635{
1636 struct sock *sk = chan->data;
1637 struct sock *parent;
1638
1639 lock_sock(sk);
1640
1641 parent = bt_sk(sk)->parent;
1642
1643 BT_DBG("sk %p, parent %p", sk, parent);
1644
1645 sk->sk_state = BT_CONNECTED;
1646 sk->sk_state_change(sk);
1647
1648 if (parent)
1649 parent->sk_data_ready(parent);
1650
1651 release_sock(sk);
1652}
1653
1654static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1655{
1656 struct sock *parent, *sk = chan->data;
1657
1658 lock_sock(sk);
1659
1660 parent = bt_sk(sk)->parent;
1661 if (parent)
1662 parent->sk_data_ready(parent);
1663
1664 release_sock(sk);
1665}
1666
1667static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1668{
1669 struct sock *sk = chan->data;
1670
1671 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1672 sk->sk_state = BT_CONNECTED;
1673 chan->state = BT_CONNECTED;
1674 }
1675
1676 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1677 sk->sk_state_change(sk);
1678}
1679
1680static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1681{
1682 struct sock *sk = chan->data;
1683
1684 lock_sock(sk);
1685 sk->sk_shutdown = SHUTDOWN_MASK;
1686 release_sock(sk);
1687}
1688
1689static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1690{
1691 struct sock *sk = chan->data;
1692
1693 return sk->sk_sndtimeo;
1694}
1695
1696static struct pid *l2cap_sock_get_peer_pid_cb(struct l2cap_chan *chan)
1697{
1698 struct sock *sk = chan->data;
1699
1700 return sk->sk_peer_pid;
1701}
1702
1703static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1704{
1705 struct sock *sk = chan->data;
1706
1707 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1708 sk->sk_state_change(sk);
1709}
1710
1711static int l2cap_sock_filter(struct l2cap_chan *chan, struct sk_buff *skb)
1712{
1713 struct sock *sk = chan->data;
1714
1715 switch (chan->mode) {
1716 case L2CAP_MODE_ERTM:
1717 case L2CAP_MODE_STREAMING:
1718 return sk_filter(sk, skb);
1719 }
1720
1721 return 0;
1722}
1723
1724static const struct l2cap_ops l2cap_chan_ops = {
1725 .name = "L2CAP Socket Interface",
1726 .new_connection = l2cap_sock_new_connection_cb,
1727 .recv = l2cap_sock_recv_cb,
1728 .close = l2cap_sock_close_cb,
1729 .teardown = l2cap_sock_teardown_cb,
1730 .state_change = l2cap_sock_state_change_cb,
1731 .ready = l2cap_sock_ready_cb,
1732 .defer = l2cap_sock_defer_cb,
1733 .resume = l2cap_sock_resume_cb,
1734 .suspend = l2cap_sock_suspend_cb,
1735 .set_shutdown = l2cap_sock_set_shutdown_cb,
1736 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1737 .get_peer_pid = l2cap_sock_get_peer_pid_cb,
1738 .alloc_skb = l2cap_sock_alloc_skb_cb,
1739 .filter = l2cap_sock_filter,
1740};
1741
1742static void l2cap_sock_destruct(struct sock *sk)
1743{
1744 BT_DBG("sk %p", sk);
1745
1746 if (l2cap_pi(sk)->chan) {
1747 l2cap_pi(sk)->chan->data = NULL;
1748 l2cap_chan_put(l2cap_pi(sk)->chan);
1749 }
1750
1751 if (l2cap_pi(sk)->rx_busy_skb) {
1752 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1753 l2cap_pi(sk)->rx_busy_skb = NULL;
1754 }
1755
1756 skb_queue_purge(&sk->sk_receive_queue);
1757 skb_queue_purge(&sk->sk_write_queue);
1758}
1759
1760static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1761 int *msg_namelen)
1762{
1763 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1764
1765 memset(la, 0, sizeof(struct sockaddr_l2));
1766 la->l2_family = AF_BLUETOOTH;
1767 la->l2_psm = bt_cb(skb)->l2cap.psm;
1768 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr);
1769
1770 *msg_namelen = sizeof(struct sockaddr_l2);
1771}
1772
1773static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1774{
1775 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1776
1777 BT_DBG("sk %p", sk);
1778
1779 if (parent) {
1780 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1781
1782 sk->sk_type = parent->sk_type;
1783 bt_sk(sk)->flags = bt_sk(parent)->flags;
1784
1785 chan->chan_type = pchan->chan_type;
1786 chan->imtu = pchan->imtu;
1787 chan->omtu = pchan->omtu;
1788 chan->conf_state = pchan->conf_state;
1789 chan->mode = pchan->mode;
1790 chan->fcs = pchan->fcs;
1791 chan->max_tx = pchan->max_tx;
1792 chan->tx_win = pchan->tx_win;
1793 chan->tx_win_max = pchan->tx_win_max;
1794 chan->sec_level = pchan->sec_level;
1795 chan->flags = pchan->flags;
1796 chan->tx_credits = pchan->tx_credits;
1797 chan->rx_credits = pchan->rx_credits;
1798
1799 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1800 chan->scid = pchan->scid;
1801 chan->dcid = pchan->scid;
1802 }
1803
1804 security_sk_clone(parent, sk);
1805 } else {
1806 switch (sk->sk_type) {
1807 case SOCK_RAW:
1808 chan->chan_type = L2CAP_CHAN_RAW;
1809 break;
1810 case SOCK_DGRAM:
1811 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1812 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1813 break;
1814 case SOCK_SEQPACKET:
1815 case SOCK_STREAM:
1816 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1817 break;
1818 }
1819
1820 chan->imtu = L2CAP_DEFAULT_MTU;
1821 chan->omtu = 0;
1822 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1823 chan->mode = L2CAP_MODE_ERTM;
1824 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1825 } else {
1826 chan->mode = L2CAP_MODE_BASIC;
1827 }
1828
1829 l2cap_chan_set_defaults(chan);
1830 }
1831
1832 /* Default config options */
1833 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1834
1835 chan->data = sk;
1836 chan->ops = &l2cap_chan_ops;
1837}
1838
1839static struct proto l2cap_proto = {
1840 .name = "L2CAP",
1841 .owner = THIS_MODULE,
1842 .obj_size = sizeof(struct l2cap_pinfo)
1843};
1844
1845static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1846 int proto, gfp_t prio, int kern)
1847{
1848 struct sock *sk;
1849 struct l2cap_chan *chan;
1850
1851 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, kern);
1852 if (!sk)
1853 return NULL;
1854
1855 sock_init_data(sock, sk);
1856 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1857
1858 sk->sk_destruct = l2cap_sock_destruct;
1859 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1860
1861 sock_reset_flag(sk, SOCK_ZAPPED);
1862
1863 sk->sk_protocol = proto;
1864 sk->sk_state = BT_OPEN;
1865
1866 chan = l2cap_chan_create();
1867 if (!chan) {
1868 sk_free(sk);
1869 return NULL;
1870 }
1871
1872 l2cap_chan_hold(chan);
1873
1874 l2cap_pi(sk)->chan = chan;
1875
1876 return sk;
1877}
1878
1879static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1880 int kern)
1881{
1882 struct sock *sk;
1883
1884 BT_DBG("sock %p", sock);
1885
1886 sock->state = SS_UNCONNECTED;
1887
1888 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1889 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1890 return -ESOCKTNOSUPPORT;
1891
1892 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1893 return -EPERM;
1894
1895 sock->ops = &l2cap_sock_ops;
1896
1897 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
1898 if (!sk)
1899 return -ENOMEM;
1900
1901 l2cap_sock_init(sk, NULL);
1902 bt_sock_link(&l2cap_sk_list, sk);
1903 return 0;
1904}
1905
1906static const struct proto_ops l2cap_sock_ops = {
1907 .family = PF_BLUETOOTH,
1908 .owner = THIS_MODULE,
1909 .release = l2cap_sock_release,
1910 .bind = l2cap_sock_bind,
1911 .connect = l2cap_sock_connect,
1912 .listen = l2cap_sock_listen,
1913 .accept = l2cap_sock_accept,
1914 .getname = l2cap_sock_getname,
1915 .sendmsg = l2cap_sock_sendmsg,
1916 .recvmsg = l2cap_sock_recvmsg,
1917 .poll = bt_sock_poll,
1918 .ioctl = bt_sock_ioctl,
1919 .gettstamp = sock_gettstamp,
1920 .mmap = sock_no_mmap,
1921 .socketpair = sock_no_socketpair,
1922 .shutdown = l2cap_sock_shutdown,
1923 .setsockopt = l2cap_sock_setsockopt,
1924 .getsockopt = l2cap_sock_getsockopt
1925};
1926
1927static const struct net_proto_family l2cap_sock_family_ops = {
1928 .family = PF_BLUETOOTH,
1929 .owner = THIS_MODULE,
1930 .create = l2cap_sock_create,
1931};
1932
1933int __init l2cap_init_sockets(void)
1934{
1935 int err;
1936
1937 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1938
1939 err = proto_register(&l2cap_proto, 0);
1940 if (err < 0)
1941 return err;
1942
1943 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1944 if (err < 0) {
1945 BT_ERR("L2CAP socket registration failed");
1946 goto error;
1947 }
1948
1949 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1950 NULL);
1951 if (err < 0) {
1952 BT_ERR("Failed to create L2CAP proc file");
1953 bt_sock_unregister(BTPROTO_L2CAP);
1954 goto error;
1955 }
1956
1957 BT_INFO("L2CAP socket layer initialized");
1958
1959 return 0;
1960
1961error:
1962 proto_unregister(&l2cap_proto);
1963 return err;
1964}
1965
1966void l2cap_cleanup_sockets(void)
1967{
1968 bt_procfs_cleanup(&init_net, "l2cap");
1969 bt_sock_unregister(BTPROTO_L2CAP);
1970 proto_unregister(&l2cap_proto);
1971}