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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 sk->sk_sndtimeo);
259 if (err)
260 return err;
261
262 lock_sock(sk);
263
264 err = bt_sock_wait_state(sk, BT_CONNECTED,
265 sock_sndtimeo(sk, flags & O_NONBLOCK));
266
267 release_sock(sk);
268
269 return err;
270}
271
272static int l2cap_sock_listen(struct socket *sock, int backlog)
273{
274 struct sock *sk = sock->sk;
275 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
276 int err = 0;
277
278 BT_DBG("sk %p backlog %d", sk, backlog);
279
280 lock_sock(sk);
281
282 if (sk->sk_state != BT_BOUND) {
283 err = -EBADFD;
284 goto done;
285 }
286
287 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
288 err = -EINVAL;
289 goto done;
290 }
291
292 switch (chan->mode) {
293 case L2CAP_MODE_BASIC:
294 case L2CAP_MODE_LE_FLOWCTL:
295 break;
296 case L2CAP_MODE_EXT_FLOWCTL:
297 if (!enable_ecred) {
298 err = -EOPNOTSUPP;
299 goto done;
300 }
301 break;
302 case L2CAP_MODE_ERTM:
303 case L2CAP_MODE_STREAMING:
304 if (!disable_ertm)
305 break;
306 fallthrough;
307 default:
308 err = -EOPNOTSUPP;
309 goto done;
310 }
311
312 sk->sk_max_ack_backlog = backlog;
313 sk->sk_ack_backlog = 0;
314
315 /* Listening channels need to use nested locking in order not to
316 * cause lockdep warnings when the created child channels end up
317 * being locked in the same thread as the parent channel.
318 */
319 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
320
321 chan->state = BT_LISTEN;
322 sk->sk_state = BT_LISTEN;
323
324done:
325 release_sock(sk);
326 return err;
327}
328
329static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
330 struct proto_accept_arg *arg)
331{
332 DEFINE_WAIT_FUNC(wait, woken_wake_function);
333 struct sock *sk = sock->sk, *nsk;
334 long timeo;
335 int err = 0;
336
337 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
338
339 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
340
341 BT_DBG("sk %p timeo %ld", sk, timeo);
342
343 /* Wait for an incoming connection. (wake-one). */
344 add_wait_queue_exclusive(sk_sleep(sk), &wait);
345 while (1) {
346 if (sk->sk_state != BT_LISTEN) {
347 err = -EBADFD;
348 break;
349 }
350
351 nsk = bt_accept_dequeue(sk, newsock);
352 if (nsk)
353 break;
354
355 if (!timeo) {
356 err = -EAGAIN;
357 break;
358 }
359
360 if (signal_pending(current)) {
361 err = sock_intr_errno(timeo);
362 break;
363 }
364
365 release_sock(sk);
366
367 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
368
369 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
370 }
371 remove_wait_queue(sk_sleep(sk), &wait);
372
373 if (err)
374 goto done;
375
376 newsock->state = SS_CONNECTED;
377
378 BT_DBG("new socket %p", nsk);
379
380done:
381 release_sock(sk);
382 return err;
383}
384
385static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
386 int peer)
387{
388 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
389 struct sock *sk = sock->sk;
390 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
391
392 BT_DBG("sock %p, sk %p", sock, sk);
393
394 if (peer && sk->sk_state != BT_CONNECTED &&
395 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 &&
396 sk->sk_state != BT_CONFIG)
397 return -ENOTCONN;
398
399 memset(la, 0, sizeof(struct sockaddr_l2));
400 addr->sa_family = AF_BLUETOOTH;
401
402 la->l2_psm = chan->psm;
403
404 if (peer) {
405 bacpy(&la->l2_bdaddr, &chan->dst);
406 la->l2_cid = cpu_to_le16(chan->dcid);
407 la->l2_bdaddr_type = chan->dst_type;
408 } else {
409 bacpy(&la->l2_bdaddr, &chan->src);
410 la->l2_cid = cpu_to_le16(chan->scid);
411 la->l2_bdaddr_type = chan->src_type;
412 }
413
414 return sizeof(struct sockaddr_l2);
415}
416
417static int l2cap_get_mode(struct l2cap_chan *chan)
418{
419 switch (chan->mode) {
420 case L2CAP_MODE_BASIC:
421 return BT_MODE_BASIC;
422 case L2CAP_MODE_ERTM:
423 return BT_MODE_ERTM;
424 case L2CAP_MODE_STREAMING:
425 return BT_MODE_STREAMING;
426 case L2CAP_MODE_LE_FLOWCTL:
427 return BT_MODE_LE_FLOWCTL;
428 case L2CAP_MODE_EXT_FLOWCTL:
429 return BT_MODE_EXT_FLOWCTL;
430 }
431
432 return -EINVAL;
433}
434
435static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
436 char __user *optval, int __user *optlen)
437{
438 struct sock *sk = sock->sk;
439 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
440 struct l2cap_options opts;
441 struct l2cap_conninfo cinfo;
442 int err = 0;
443 size_t len;
444 u32 opt;
445
446 BT_DBG("sk %p", sk);
447
448 if (get_user(len, optlen))
449 return -EFAULT;
450
451 lock_sock(sk);
452
453 switch (optname) {
454 case L2CAP_OPTIONS:
455 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
456 * legacy ATT code depends on getsockopt for
457 * L2CAP_OPTIONS we need to let this pass.
458 */
459 if (bdaddr_type_is_le(chan->src_type) &&
460 chan->scid != L2CAP_CID_ATT) {
461 err = -EINVAL;
462 break;
463 }
464
465 /* Only BR/EDR modes are supported here */
466 switch (chan->mode) {
467 case L2CAP_MODE_BASIC:
468 case L2CAP_MODE_ERTM:
469 case L2CAP_MODE_STREAMING:
470 break;
471 default:
472 err = -EINVAL;
473 break;
474 }
475
476 if (err < 0)
477 break;
478
479 memset(&opts, 0, sizeof(opts));
480 opts.imtu = chan->imtu;
481 opts.omtu = chan->omtu;
482 opts.flush_to = chan->flush_to;
483 opts.mode = chan->mode;
484 opts.fcs = chan->fcs;
485 opts.max_tx = chan->max_tx;
486 opts.txwin_size = chan->tx_win;
487
488 BT_DBG("mode 0x%2.2x", chan->mode);
489
490 len = min(len, sizeof(opts));
491 if (copy_to_user(optval, (char *) &opts, len))
492 err = -EFAULT;
493
494 break;
495
496 case L2CAP_LM:
497 switch (chan->sec_level) {
498 case BT_SECURITY_LOW:
499 opt = L2CAP_LM_AUTH;
500 break;
501 case BT_SECURITY_MEDIUM:
502 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
503 break;
504 case BT_SECURITY_HIGH:
505 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
506 L2CAP_LM_SECURE;
507 break;
508 case BT_SECURITY_FIPS:
509 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
510 L2CAP_LM_SECURE | L2CAP_LM_FIPS;
511 break;
512 default:
513 opt = 0;
514 break;
515 }
516
517 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
518 opt |= L2CAP_LM_MASTER;
519
520 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
521 opt |= L2CAP_LM_RELIABLE;
522
523 if (put_user(opt, (u32 __user *) optval))
524 err = -EFAULT;
525
526 break;
527
528 case L2CAP_CONNINFO:
529 if (sk->sk_state != BT_CONNECTED &&
530 !(sk->sk_state == BT_CONNECT2 &&
531 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
532 err = -ENOTCONN;
533 break;
534 }
535
536 memset(&cinfo, 0, sizeof(cinfo));
537 cinfo.hci_handle = chan->conn->hcon->handle;
538 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
539
540 len = min(len, sizeof(cinfo));
541 if (copy_to_user(optval, (char *) &cinfo, len))
542 err = -EFAULT;
543
544 break;
545
546 default:
547 err = -ENOPROTOOPT;
548 break;
549 }
550
551 release_sock(sk);
552 return err;
553}
554
555static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
556 char __user *optval, int __user *optlen)
557{
558 struct sock *sk = sock->sk;
559 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
560 struct bt_security sec;
561 struct bt_power pwr;
562 u32 phys;
563 int len, mode, err = 0;
564
565 BT_DBG("sk %p", sk);
566
567 if (level == SOL_L2CAP)
568 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
569
570 if (level != SOL_BLUETOOTH)
571 return -ENOPROTOOPT;
572
573 if (get_user(len, optlen))
574 return -EFAULT;
575
576 lock_sock(sk);
577
578 switch (optname) {
579 case BT_SECURITY:
580 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
581 chan->chan_type != L2CAP_CHAN_FIXED &&
582 chan->chan_type != L2CAP_CHAN_RAW) {
583 err = -EINVAL;
584 break;
585 }
586
587 memset(&sec, 0, sizeof(sec));
588 if (chan->conn) {
589 sec.level = chan->conn->hcon->sec_level;
590
591 if (sk->sk_state == BT_CONNECTED)
592 sec.key_size = chan->conn->hcon->enc_key_size;
593 } else {
594 sec.level = chan->sec_level;
595 }
596
597 len = min_t(unsigned int, len, sizeof(sec));
598 if (copy_to_user(optval, (char *) &sec, len))
599 err = -EFAULT;
600
601 break;
602
603 case BT_DEFER_SETUP:
604 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
605 err = -EINVAL;
606 break;
607 }
608
609 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
610 (u32 __user *) optval))
611 err = -EFAULT;
612
613 break;
614
615 case BT_FLUSHABLE:
616 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
617 (u32 __user *) optval))
618 err = -EFAULT;
619
620 break;
621
622 case BT_POWER:
623 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
624 && sk->sk_type != SOCK_RAW) {
625 err = -EINVAL;
626 break;
627 }
628
629 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
630
631 len = min_t(unsigned int, len, sizeof(pwr));
632 if (copy_to_user(optval, (char *) &pwr, len))
633 err = -EFAULT;
634
635 break;
636
637 case BT_CHANNEL_POLICY:
638 if (put_user(chan->chan_policy, (u32 __user *) optval))
639 err = -EFAULT;
640 break;
641
642 case BT_SNDMTU:
643 if (!bdaddr_type_is_le(chan->src_type)) {
644 err = -EINVAL;
645 break;
646 }
647
648 if (sk->sk_state != BT_CONNECTED) {
649 err = -ENOTCONN;
650 break;
651 }
652
653 if (put_user(chan->omtu, (u16 __user *) optval))
654 err = -EFAULT;
655 break;
656
657 case BT_RCVMTU:
658 if (!bdaddr_type_is_le(chan->src_type)) {
659 err = -EINVAL;
660 break;
661 }
662
663 if (put_user(chan->imtu, (u16 __user *) optval))
664 err = -EFAULT;
665 break;
666
667 case BT_PHY:
668 if (sk->sk_state != BT_CONNECTED) {
669 err = -ENOTCONN;
670 break;
671 }
672
673 phys = hci_conn_get_phy(chan->conn->hcon);
674
675 if (put_user(phys, (u32 __user *) optval))
676 err = -EFAULT;
677 break;
678
679 case BT_MODE:
680 if (!enable_ecred) {
681 err = -ENOPROTOOPT;
682 break;
683 }
684
685 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
686 err = -EINVAL;
687 break;
688 }
689
690 mode = l2cap_get_mode(chan);
691 if (mode < 0) {
692 err = mode;
693 break;
694 }
695
696 if (put_user(mode, (u8 __user *) optval))
697 err = -EFAULT;
698 break;
699
700 default:
701 err = -ENOPROTOOPT;
702 break;
703 }
704
705 release_sock(sk);
706 return err;
707}
708
709static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
710{
711 switch (chan->scid) {
712 case L2CAP_CID_ATT:
713 if (mtu && mtu < L2CAP_LE_MIN_MTU)
714 return false;
715 break;
716
717 default:
718 if (mtu && mtu < L2CAP_DEFAULT_MIN_MTU)
719 return false;
720 }
721
722 return true;
723}
724
725static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
726 sockptr_t optval, unsigned int optlen)
727{
728 struct sock *sk = sock->sk;
729 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
730 struct l2cap_options opts;
731 int err = 0;
732 u32 opt;
733
734 BT_DBG("sk %p", sk);
735
736 lock_sock(sk);
737
738 switch (optname) {
739 case L2CAP_OPTIONS:
740 if (bdaddr_type_is_le(chan->src_type)) {
741 err = -EINVAL;
742 break;
743 }
744
745 if (sk->sk_state == BT_CONNECTED) {
746 err = -EINVAL;
747 break;
748 }
749
750 opts.imtu = chan->imtu;
751 opts.omtu = chan->omtu;
752 opts.flush_to = chan->flush_to;
753 opts.mode = chan->mode;
754 opts.fcs = chan->fcs;
755 opts.max_tx = chan->max_tx;
756 opts.txwin_size = chan->tx_win;
757
758 err = copy_safe_from_sockptr(&opts, sizeof(opts), optval,
759 optlen);
760 if (err)
761 break;
762
763 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
764 err = -EINVAL;
765 break;
766 }
767
768 if (!l2cap_valid_mtu(chan, opts.imtu)) {
769 err = -EINVAL;
770 break;
771 }
772
773 /* Only BR/EDR modes are supported here */
774 switch (opts.mode) {
775 case L2CAP_MODE_BASIC:
776 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
777 break;
778 case L2CAP_MODE_ERTM:
779 case L2CAP_MODE_STREAMING:
780 if (!disable_ertm)
781 break;
782 fallthrough;
783 default:
784 err = -EINVAL;
785 break;
786 }
787
788 if (err < 0)
789 break;
790
791 chan->mode = opts.mode;
792
793 BT_DBG("mode 0x%2.2x", chan->mode);
794
795 chan->imtu = opts.imtu;
796 chan->omtu = opts.omtu;
797 chan->fcs = opts.fcs;
798 chan->max_tx = opts.max_tx;
799 chan->tx_win = opts.txwin_size;
800 chan->flush_to = opts.flush_to;
801 break;
802
803 case L2CAP_LM:
804 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
805 if (err)
806 break;
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 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 err = copy_safe_from_sockptr(&sec, sizeof(sec), optval, optlen);
914 if (err)
915 break;
916
917 if (sec.level < BT_SECURITY_LOW ||
918 sec.level > BT_SECURITY_FIPS) {
919 err = -EINVAL;
920 break;
921 }
922
923 chan->sec_level = sec.level;
924
925 if (!chan->conn)
926 break;
927
928 conn = chan->conn;
929
930 /* change security for LE channels */
931 if (chan->scid == L2CAP_CID_ATT) {
932 if (smp_conn_security(conn->hcon, sec.level)) {
933 err = -EINVAL;
934 break;
935 }
936
937 set_bit(FLAG_PENDING_SECURITY, &chan->flags);
938 sk->sk_state = BT_CONFIG;
939 chan->state = BT_CONFIG;
940
941 /* or for ACL link */
942 } else if ((sk->sk_state == BT_CONNECT2 &&
943 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
944 sk->sk_state == BT_CONNECTED) {
945 if (!l2cap_chan_check_security(chan, true))
946 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
947 else
948 sk->sk_state_change(sk);
949 } else {
950 err = -EINVAL;
951 }
952 break;
953
954 case BT_DEFER_SETUP:
955 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
956 err = -EINVAL;
957 break;
958 }
959
960 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
961 if (err)
962 break;
963
964 if (opt) {
965 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
966 set_bit(FLAG_DEFER_SETUP, &chan->flags);
967 } else {
968 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
969 clear_bit(FLAG_DEFER_SETUP, &chan->flags);
970 }
971 break;
972
973 case BT_FLUSHABLE:
974 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
975 if (err)
976 break;
977
978 if (opt > BT_FLUSHABLE_ON) {
979 err = -EINVAL;
980 break;
981 }
982
983 if (opt == BT_FLUSHABLE_OFF) {
984 conn = chan->conn;
985 /* proceed further only when we have l2cap_conn and
986 No Flush support in the LM */
987 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
988 err = -EINVAL;
989 break;
990 }
991 }
992
993 if (opt)
994 set_bit(FLAG_FLUSHABLE, &chan->flags);
995 else
996 clear_bit(FLAG_FLUSHABLE, &chan->flags);
997 break;
998
999 case BT_POWER:
1000 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
1001 chan->chan_type != L2CAP_CHAN_RAW) {
1002 err = -EINVAL;
1003 break;
1004 }
1005
1006 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
1007
1008 err = copy_safe_from_sockptr(&pwr, sizeof(pwr), optval, optlen);
1009 if (err)
1010 break;
1011
1012 if (pwr.force_active)
1013 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1014 else
1015 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1016 break;
1017
1018 case BT_CHANNEL_POLICY:
1019 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
1020 if (err)
1021 break;
1022
1023 err = -EOPNOTSUPP;
1024 break;
1025
1026 case BT_SNDMTU:
1027 if (!bdaddr_type_is_le(chan->src_type)) {
1028 err = -EINVAL;
1029 break;
1030 }
1031
1032 /* Setting is not supported as it's the remote side that
1033 * decides this.
1034 */
1035 err = -EPERM;
1036 break;
1037
1038 case BT_RCVMTU:
1039 if (!bdaddr_type_is_le(chan->src_type)) {
1040 err = -EINVAL;
1041 break;
1042 }
1043
1044 if (chan->mode == L2CAP_MODE_LE_FLOWCTL &&
1045 sk->sk_state == BT_CONNECTED) {
1046 err = -EISCONN;
1047 break;
1048 }
1049
1050 err = copy_safe_from_sockptr(&mtu, sizeof(mtu), optval, optlen);
1051 if (err)
1052 break;
1053
1054 if (chan->mode == L2CAP_MODE_EXT_FLOWCTL &&
1055 sk->sk_state == BT_CONNECTED)
1056 err = l2cap_chan_reconfigure(chan, mtu);
1057 else
1058 chan->imtu = mtu;
1059
1060 break;
1061
1062 case BT_MODE:
1063 if (!enable_ecred) {
1064 err = -ENOPROTOOPT;
1065 break;
1066 }
1067
1068 BT_DBG("sk->sk_state %u", sk->sk_state);
1069
1070 if (sk->sk_state != BT_BOUND) {
1071 err = -EINVAL;
1072 break;
1073 }
1074
1075 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1076 err = -EINVAL;
1077 break;
1078 }
1079
1080 err = copy_safe_from_sockptr(&mode, sizeof(mode), optval,
1081 optlen);
1082 if (err)
1083 break;
1084
1085 BT_DBG("mode %u", mode);
1086
1087 err = l2cap_set_mode(chan, mode);
1088 if (err)
1089 break;
1090
1091 BT_DBG("mode 0x%2.2x", chan->mode);
1092
1093 break;
1094
1095 default:
1096 err = -ENOPROTOOPT;
1097 break;
1098 }
1099
1100 release_sock(sk);
1101 return err;
1102}
1103
1104static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1105 size_t len)
1106{
1107 struct sock *sk = sock->sk;
1108 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1109 int err;
1110
1111 BT_DBG("sock %p, sk %p", sock, sk);
1112
1113 err = sock_error(sk);
1114 if (err)
1115 return err;
1116
1117 if (msg->msg_flags & MSG_OOB)
1118 return -EOPNOTSUPP;
1119
1120 if (sk->sk_state != BT_CONNECTED)
1121 return -ENOTCONN;
1122
1123 lock_sock(sk);
1124 err = bt_sock_wait_ready(sk, msg->msg_flags);
1125 release_sock(sk);
1126 if (err)
1127 return err;
1128
1129 l2cap_chan_lock(chan);
1130 err = l2cap_chan_send(chan, msg, len);
1131 l2cap_chan_unlock(chan);
1132
1133 return err;
1134}
1135
1136static void l2cap_publish_rx_avail(struct l2cap_chan *chan)
1137{
1138 struct sock *sk = chan->data;
1139 ssize_t avail = sk->sk_rcvbuf - atomic_read(&sk->sk_rmem_alloc);
1140 int expected_skbs, skb_overhead;
1141
1142 if (avail <= 0) {
1143 l2cap_chan_rx_avail(chan, 0);
1144 return;
1145 }
1146
1147 if (!chan->mps) {
1148 l2cap_chan_rx_avail(chan, -1);
1149 return;
1150 }
1151
1152 /* Correct available memory by estimated sk_buff overhead.
1153 * This is significant due to small transfer sizes. However, accept
1154 * at least one full packet if receive space is non-zero.
1155 */
1156 expected_skbs = DIV_ROUND_UP(avail, chan->mps);
1157 skb_overhead = expected_skbs * sizeof(struct sk_buff);
1158 if (skb_overhead < avail)
1159 l2cap_chan_rx_avail(chan, avail - skb_overhead);
1160 else
1161 l2cap_chan_rx_avail(chan, -1);
1162}
1163
1164static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1165 size_t len, int flags)
1166{
1167 struct sock *sk = sock->sk;
1168 struct l2cap_pinfo *pi = l2cap_pi(sk);
1169 int err;
1170
1171 lock_sock(sk);
1172
1173 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
1174 &bt_sk(sk)->flags)) {
1175 if (pi->chan->mode == L2CAP_MODE_EXT_FLOWCTL) {
1176 sk->sk_state = BT_CONNECTED;
1177 pi->chan->state = BT_CONNECTED;
1178 __l2cap_ecred_conn_rsp_defer(pi->chan);
1179 } else if (bdaddr_type_is_le(pi->chan->src_type)) {
1180 sk->sk_state = BT_CONNECTED;
1181 pi->chan->state = BT_CONNECTED;
1182 __l2cap_le_connect_rsp_defer(pi->chan);
1183 } else {
1184 sk->sk_state = BT_CONFIG;
1185 pi->chan->state = BT_CONFIG;
1186 __l2cap_connect_rsp_defer(pi->chan);
1187 }
1188
1189 err = 0;
1190 goto done;
1191 }
1192
1193 release_sock(sk);
1194
1195 if (sock->type == SOCK_STREAM)
1196 err = bt_sock_stream_recvmsg(sock, msg, len, flags);
1197 else
1198 err = bt_sock_recvmsg(sock, msg, len, flags);
1199
1200 if (pi->chan->mode != L2CAP_MODE_ERTM &&
1201 pi->chan->mode != L2CAP_MODE_LE_FLOWCTL &&
1202 pi->chan->mode != L2CAP_MODE_EXT_FLOWCTL)
1203 return err;
1204
1205 lock_sock(sk);
1206
1207 l2cap_publish_rx_avail(pi->chan);
1208
1209 /* Attempt to put pending rx data in the socket buffer */
1210 while (!list_empty(&pi->rx_busy)) {
1211 struct l2cap_rx_busy *rx_busy =
1212 list_first_entry(&pi->rx_busy,
1213 struct l2cap_rx_busy,
1214 list);
1215 if (__sock_queue_rcv_skb(sk, rx_busy->skb) < 0)
1216 goto done;
1217 list_del(&rx_busy->list);
1218 kfree(rx_busy);
1219 }
1220
1221 /* Restore data flow when half of the receive buffer is
1222 * available. This avoids resending large numbers of
1223 * frames.
1224 */
1225 if (test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state) &&
1226 atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1227 l2cap_chan_busy(pi->chan, 0);
1228
1229done:
1230 release_sock(sk);
1231 return err;
1232}
1233
1234/* Kill socket (only if zapped and orphan)
1235 * Must be called on unlocked socket, with l2cap channel lock.
1236 */
1237static void l2cap_sock_kill(struct sock *sk)
1238{
1239 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1240 return;
1241
1242 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
1243
1244 /* Sock is dead, so set chan data to NULL, avoid other task use invalid
1245 * sock pointer.
1246 */
1247 l2cap_pi(sk)->chan->data = NULL;
1248 /* Kill poor orphan */
1249
1250 l2cap_chan_put(l2cap_pi(sk)->chan);
1251 sock_set_flag(sk, SOCK_DEAD);
1252 sock_put(sk);
1253}
1254
1255static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
1256{
1257 DECLARE_WAITQUEUE(wait, current);
1258 int err = 0;
1259 int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1260 /* Timeout to prevent infinite loop */
1261 unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
1262
1263 add_wait_queue(sk_sleep(sk), &wait);
1264 set_current_state(TASK_INTERRUPTIBLE);
1265 do {
1266 BT_DBG("Waiting for %d ACKs, timeout %04d ms",
1267 chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
1268 jiffies_to_msecs(timeout - jiffies));
1269
1270 if (!timeo)
1271 timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1272
1273 if (signal_pending(current)) {
1274 err = sock_intr_errno(timeo);
1275 break;
1276 }
1277
1278 release_sock(sk);
1279 timeo = schedule_timeout(timeo);
1280 lock_sock(sk);
1281 set_current_state(TASK_INTERRUPTIBLE);
1282
1283 err = sock_error(sk);
1284 if (err)
1285 break;
1286
1287 if (time_after(jiffies, timeout)) {
1288 err = -ENOLINK;
1289 break;
1290 }
1291
1292 } while (chan->unacked_frames > 0 &&
1293 chan->state == BT_CONNECTED);
1294
1295 set_current_state(TASK_RUNNING);
1296 remove_wait_queue(sk_sleep(sk), &wait);
1297 return err;
1298}
1299
1300static int l2cap_sock_shutdown(struct socket *sock, int how)
1301{
1302 struct sock *sk = sock->sk;
1303 struct l2cap_chan *chan;
1304 struct l2cap_conn *conn;
1305 int err = 0;
1306
1307 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1308
1309 /* 'how' parameter is mapped to sk_shutdown as follows:
1310 * SHUT_RD (0) --> RCV_SHUTDOWN (1)
1311 * SHUT_WR (1) --> SEND_SHUTDOWN (2)
1312 * SHUT_RDWR (2) --> SHUTDOWN_MASK (3)
1313 */
1314 how++;
1315
1316 if (!sk)
1317 return 0;
1318
1319 lock_sock(sk);
1320
1321 if ((sk->sk_shutdown & how) == how)
1322 goto shutdown_already;
1323
1324 BT_DBG("Handling sock shutdown");
1325
1326 /* prevent sk structure from being freed whilst unlocked */
1327 sock_hold(sk);
1328
1329 chan = l2cap_pi(sk)->chan;
1330 /* prevent chan structure from being freed whilst unlocked */
1331 l2cap_chan_hold(chan);
1332
1333 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1334
1335 if (chan->mode == L2CAP_MODE_ERTM &&
1336 chan->unacked_frames > 0 &&
1337 chan->state == BT_CONNECTED) {
1338 err = __l2cap_wait_ack(sk, chan);
1339
1340 /* After waiting for ACKs, check whether shutdown
1341 * has already been actioned to close the L2CAP
1342 * link such as by l2cap_disconnection_req().
1343 */
1344 if ((sk->sk_shutdown & how) == how)
1345 goto shutdown_matched;
1346 }
1347
1348 /* Try setting the RCV_SHUTDOWN bit, return early if SEND_SHUTDOWN
1349 * is already set
1350 */
1351 if ((how & RCV_SHUTDOWN) && !(sk->sk_shutdown & RCV_SHUTDOWN)) {
1352 sk->sk_shutdown |= RCV_SHUTDOWN;
1353 if ((sk->sk_shutdown & how) == how)
1354 goto shutdown_matched;
1355 }
1356
1357 sk->sk_shutdown |= SEND_SHUTDOWN;
1358 release_sock(sk);
1359
1360 l2cap_chan_lock(chan);
1361 conn = chan->conn;
1362 if (conn)
1363 /* prevent conn structure from being freed */
1364 l2cap_conn_get(conn);
1365 l2cap_chan_unlock(chan);
1366
1367 if (conn)
1368 /* mutex lock must be taken before l2cap_chan_lock() */
1369 mutex_lock(&conn->chan_lock);
1370
1371 l2cap_chan_lock(chan);
1372 l2cap_chan_close(chan, 0);
1373 l2cap_chan_unlock(chan);
1374
1375 if (conn) {
1376 mutex_unlock(&conn->chan_lock);
1377 l2cap_conn_put(conn);
1378 }
1379
1380 lock_sock(sk);
1381
1382 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1383 !(current->flags & PF_EXITING))
1384 err = bt_sock_wait_state(sk, BT_CLOSED,
1385 sk->sk_lingertime);
1386
1387shutdown_matched:
1388 l2cap_chan_put(chan);
1389 sock_put(sk);
1390
1391shutdown_already:
1392 if (!err && sk->sk_err)
1393 err = -sk->sk_err;
1394
1395 release_sock(sk);
1396
1397 BT_DBG("Sock shutdown complete err: %d", err);
1398
1399 return err;
1400}
1401
1402static int l2cap_sock_release(struct socket *sock)
1403{
1404 struct sock *sk = sock->sk;
1405 int err;
1406 struct l2cap_chan *chan;
1407
1408 BT_DBG("sock %p, sk %p", sock, sk);
1409
1410 if (!sk)
1411 return 0;
1412
1413 l2cap_sock_cleanup_listen(sk);
1414 bt_sock_unlink(&l2cap_sk_list, sk);
1415
1416 err = l2cap_sock_shutdown(sock, SHUT_RDWR);
1417 chan = l2cap_pi(sk)->chan;
1418
1419 l2cap_chan_hold(chan);
1420 l2cap_chan_lock(chan);
1421
1422 sock_orphan(sk);
1423 l2cap_sock_kill(sk);
1424
1425 l2cap_chan_unlock(chan);
1426 l2cap_chan_put(chan);
1427
1428 return err;
1429}
1430
1431static void l2cap_sock_cleanup_listen(struct sock *parent)
1432{
1433 struct sock *sk;
1434
1435 BT_DBG("parent %p state %s", parent,
1436 state_to_string(parent->sk_state));
1437
1438 /* Close not yet accepted channels */
1439 while ((sk = bt_accept_dequeue(parent, NULL))) {
1440 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1441
1442 BT_DBG("child chan %p state %s", chan,
1443 state_to_string(chan->state));
1444
1445 l2cap_chan_hold(chan);
1446 l2cap_chan_lock(chan);
1447
1448 __clear_chan_timer(chan);
1449 l2cap_chan_close(chan, ECONNRESET);
1450 l2cap_sock_kill(sk);
1451
1452 l2cap_chan_unlock(chan);
1453 l2cap_chan_put(chan);
1454 }
1455}
1456
1457static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1458{
1459 struct sock *sk, *parent = chan->data;
1460
1461 lock_sock(parent);
1462
1463 /* Check for backlog size */
1464 if (sk_acceptq_is_full(parent)) {
1465 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1466 release_sock(parent);
1467 return NULL;
1468 }
1469
1470 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1471 GFP_ATOMIC, 0);
1472 if (!sk) {
1473 release_sock(parent);
1474 return NULL;
1475 }
1476
1477 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1478
1479 l2cap_sock_init(sk, parent);
1480
1481 bt_accept_enqueue(parent, sk, false);
1482
1483 release_sock(parent);
1484
1485 return l2cap_pi(sk)->chan;
1486}
1487
1488static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1489{
1490 struct sock *sk;
1491 struct l2cap_pinfo *pi;
1492 int err;
1493
1494 sk = chan->data;
1495 if (!sk)
1496 return -ENXIO;
1497
1498 pi = l2cap_pi(sk);
1499 lock_sock(sk);
1500 if (chan->mode == L2CAP_MODE_ERTM && !list_empty(&pi->rx_busy)) {
1501 err = -ENOMEM;
1502 goto done;
1503 }
1504
1505 if (chan->mode != L2CAP_MODE_ERTM &&
1506 chan->mode != L2CAP_MODE_STREAMING &&
1507 chan->mode != L2CAP_MODE_LE_FLOWCTL &&
1508 chan->mode != L2CAP_MODE_EXT_FLOWCTL) {
1509 /* Even if no filter is attached, we could potentially
1510 * get errors from security modules, etc.
1511 */
1512 err = sk_filter(sk, skb);
1513 if (err)
1514 goto done;
1515 }
1516
1517 err = __sock_queue_rcv_skb(sk, skb);
1518
1519 l2cap_publish_rx_avail(chan);
1520
1521 /* For ERTM and LE, handle a skb that doesn't fit into the recv
1522 * buffer. This is important to do because the data frames
1523 * have already been acked, so the skb cannot be discarded.
1524 *
1525 * Notify the l2cap core that the buffer is full, so the
1526 * LOCAL_BUSY state is entered and no more frames are
1527 * acked and reassembled until there is buffer space
1528 * available.
1529 */
1530 if (err < 0 &&
1531 (chan->mode == L2CAP_MODE_ERTM ||
1532 chan->mode == L2CAP_MODE_LE_FLOWCTL ||
1533 chan->mode == L2CAP_MODE_EXT_FLOWCTL)) {
1534 struct l2cap_rx_busy *rx_busy =
1535 kmalloc(sizeof(*rx_busy), GFP_KERNEL);
1536 if (!rx_busy) {
1537 err = -ENOMEM;
1538 goto done;
1539 }
1540 rx_busy->skb = skb;
1541 list_add_tail(&rx_busy->list, &pi->rx_busy);
1542 l2cap_chan_busy(chan, 1);
1543 err = 0;
1544 }
1545
1546done:
1547 release_sock(sk);
1548
1549 return err;
1550}
1551
1552static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1553{
1554 struct sock *sk = chan->data;
1555
1556 if (!sk)
1557 return;
1558
1559 l2cap_sock_kill(sk);
1560}
1561
1562static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1563{
1564 struct sock *sk = chan->data;
1565 struct sock *parent;
1566
1567 if (!sk)
1568 return;
1569
1570 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1571
1572 /* This callback can be called both for server (BT_LISTEN)
1573 * sockets as well as "normal" ones. To avoid lockdep warnings
1574 * with child socket locking (through l2cap_sock_cleanup_listen)
1575 * we need separation into separate nesting levels. The simplest
1576 * way to accomplish this is to inherit the nesting level used
1577 * for the channel.
1578 */
1579 lock_sock_nested(sk, atomic_read(&chan->nesting));
1580
1581 parent = bt_sk(sk)->parent;
1582
1583 switch (chan->state) {
1584 case BT_OPEN:
1585 case BT_BOUND:
1586 case BT_CLOSED:
1587 break;
1588 case BT_LISTEN:
1589 l2cap_sock_cleanup_listen(sk);
1590 sk->sk_state = BT_CLOSED;
1591 chan->state = BT_CLOSED;
1592
1593 break;
1594 default:
1595 sk->sk_state = BT_CLOSED;
1596 chan->state = BT_CLOSED;
1597
1598 sk->sk_err = err;
1599
1600 if (parent) {
1601 bt_accept_unlink(sk);
1602 parent->sk_data_ready(parent);
1603 } else {
1604 sk->sk_state_change(sk);
1605 }
1606
1607 break;
1608 }
1609 release_sock(sk);
1610
1611 /* Only zap after cleanup to avoid use after free race */
1612 sock_set_flag(sk, SOCK_ZAPPED);
1613
1614}
1615
1616static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1617 int err)
1618{
1619 struct sock *sk = chan->data;
1620
1621 sk->sk_state = state;
1622
1623 if (err)
1624 sk->sk_err = err;
1625}
1626
1627static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1628 unsigned long hdr_len,
1629 unsigned long len, int nb)
1630{
1631 struct sock *sk = chan->data;
1632 struct sk_buff *skb;
1633 int err;
1634
1635 l2cap_chan_unlock(chan);
1636 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1637 l2cap_chan_lock(chan);
1638
1639 if (!skb)
1640 return ERR_PTR(err);
1641
1642 /* Channel lock is released before requesting new skb and then
1643 * reacquired thus we need to recheck channel state.
1644 */
1645 if (chan->state != BT_CONNECTED) {
1646 kfree_skb(skb);
1647 return ERR_PTR(-ENOTCONN);
1648 }
1649
1650 skb->priority = READ_ONCE(sk->sk_priority);
1651
1652 bt_cb(skb)->l2cap.chan = chan;
1653
1654 return skb;
1655}
1656
1657static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1658{
1659 struct sock *sk = chan->data;
1660 struct sock *parent;
1661
1662 lock_sock(sk);
1663
1664 parent = bt_sk(sk)->parent;
1665
1666 BT_DBG("sk %p, parent %p", sk, parent);
1667
1668 sk->sk_state = BT_CONNECTED;
1669 sk->sk_state_change(sk);
1670
1671 if (parent)
1672 parent->sk_data_ready(parent);
1673
1674 release_sock(sk);
1675}
1676
1677static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1678{
1679 struct sock *parent, *sk = chan->data;
1680
1681 lock_sock(sk);
1682
1683 parent = bt_sk(sk)->parent;
1684 if (parent)
1685 parent->sk_data_ready(parent);
1686
1687 release_sock(sk);
1688}
1689
1690static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1691{
1692 struct sock *sk = chan->data;
1693
1694 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1695 sk->sk_state = BT_CONNECTED;
1696 chan->state = BT_CONNECTED;
1697 }
1698
1699 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1700 sk->sk_state_change(sk);
1701}
1702
1703static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1704{
1705 struct sock *sk = chan->data;
1706
1707 lock_sock(sk);
1708 sk->sk_shutdown = SHUTDOWN_MASK;
1709 release_sock(sk);
1710}
1711
1712static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1713{
1714 struct sock *sk = chan->data;
1715
1716 return sk->sk_sndtimeo;
1717}
1718
1719static struct pid *l2cap_sock_get_peer_pid_cb(struct l2cap_chan *chan)
1720{
1721 struct sock *sk = chan->data;
1722
1723 return sk->sk_peer_pid;
1724}
1725
1726static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1727{
1728 struct sock *sk = chan->data;
1729
1730 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1731 sk->sk_state_change(sk);
1732}
1733
1734static int l2cap_sock_filter(struct l2cap_chan *chan, struct sk_buff *skb)
1735{
1736 struct sock *sk = chan->data;
1737
1738 switch (chan->mode) {
1739 case L2CAP_MODE_ERTM:
1740 case L2CAP_MODE_STREAMING:
1741 return sk_filter(sk, skb);
1742 }
1743
1744 return 0;
1745}
1746
1747static const struct l2cap_ops l2cap_chan_ops = {
1748 .name = "L2CAP Socket Interface",
1749 .new_connection = l2cap_sock_new_connection_cb,
1750 .recv = l2cap_sock_recv_cb,
1751 .close = l2cap_sock_close_cb,
1752 .teardown = l2cap_sock_teardown_cb,
1753 .state_change = l2cap_sock_state_change_cb,
1754 .ready = l2cap_sock_ready_cb,
1755 .defer = l2cap_sock_defer_cb,
1756 .resume = l2cap_sock_resume_cb,
1757 .suspend = l2cap_sock_suspend_cb,
1758 .set_shutdown = l2cap_sock_set_shutdown_cb,
1759 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1760 .get_peer_pid = l2cap_sock_get_peer_pid_cb,
1761 .alloc_skb = l2cap_sock_alloc_skb_cb,
1762 .filter = l2cap_sock_filter,
1763};
1764
1765static void l2cap_sock_destruct(struct sock *sk)
1766{
1767 struct l2cap_rx_busy *rx_busy, *next;
1768
1769 BT_DBG("sk %p", sk);
1770
1771 if (l2cap_pi(sk)->chan) {
1772 l2cap_pi(sk)->chan->data = NULL;
1773 l2cap_chan_put(l2cap_pi(sk)->chan);
1774 }
1775
1776 list_for_each_entry_safe(rx_busy, next, &l2cap_pi(sk)->rx_busy, list) {
1777 kfree_skb(rx_busy->skb);
1778 list_del(&rx_busy->list);
1779 kfree(rx_busy);
1780 }
1781
1782 skb_queue_purge(&sk->sk_receive_queue);
1783 skb_queue_purge(&sk->sk_write_queue);
1784}
1785
1786static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1787 int *msg_namelen)
1788{
1789 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1790
1791 memset(la, 0, sizeof(struct sockaddr_l2));
1792 la->l2_family = AF_BLUETOOTH;
1793 la->l2_psm = bt_cb(skb)->l2cap.psm;
1794 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr);
1795
1796 *msg_namelen = sizeof(struct sockaddr_l2);
1797}
1798
1799static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1800{
1801 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1802
1803 BT_DBG("sk %p", sk);
1804
1805 if (parent) {
1806 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1807
1808 sk->sk_type = parent->sk_type;
1809 bt_sk(sk)->flags = bt_sk(parent)->flags;
1810
1811 chan->chan_type = pchan->chan_type;
1812 chan->imtu = pchan->imtu;
1813 chan->omtu = pchan->omtu;
1814 chan->conf_state = pchan->conf_state;
1815 chan->mode = pchan->mode;
1816 chan->fcs = pchan->fcs;
1817 chan->max_tx = pchan->max_tx;
1818 chan->tx_win = pchan->tx_win;
1819 chan->tx_win_max = pchan->tx_win_max;
1820 chan->sec_level = pchan->sec_level;
1821 chan->flags = pchan->flags;
1822 chan->tx_credits = pchan->tx_credits;
1823 chan->rx_credits = pchan->rx_credits;
1824
1825 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1826 chan->scid = pchan->scid;
1827 chan->dcid = pchan->scid;
1828 }
1829
1830 security_sk_clone(parent, sk);
1831 } else {
1832 switch (sk->sk_type) {
1833 case SOCK_RAW:
1834 chan->chan_type = L2CAP_CHAN_RAW;
1835 break;
1836 case SOCK_DGRAM:
1837 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1838 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1839 break;
1840 case SOCK_SEQPACKET:
1841 case SOCK_STREAM:
1842 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1843 break;
1844 }
1845
1846 chan->imtu = L2CAP_DEFAULT_MTU;
1847 chan->omtu = 0;
1848 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1849 chan->mode = L2CAP_MODE_ERTM;
1850 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1851 } else {
1852 chan->mode = L2CAP_MODE_BASIC;
1853 }
1854
1855 l2cap_chan_set_defaults(chan);
1856 }
1857
1858 /* Default config options */
1859 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1860
1861 chan->data = sk;
1862 chan->ops = &l2cap_chan_ops;
1863
1864 l2cap_publish_rx_avail(chan);
1865}
1866
1867static struct proto l2cap_proto = {
1868 .name = "L2CAP",
1869 .owner = THIS_MODULE,
1870 .obj_size = sizeof(struct l2cap_pinfo)
1871};
1872
1873static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1874 int proto, gfp_t prio, int kern)
1875{
1876 struct sock *sk;
1877 struct l2cap_chan *chan;
1878
1879 sk = bt_sock_alloc(net, sock, &l2cap_proto, proto, prio, kern);
1880 if (!sk)
1881 return NULL;
1882
1883 sk->sk_destruct = l2cap_sock_destruct;
1884 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1885
1886 INIT_LIST_HEAD(&l2cap_pi(sk)->rx_busy);
1887
1888 chan = l2cap_chan_create();
1889 if (!chan) {
1890 sk_free(sk);
1891 if (sock)
1892 sock->sk = NULL;
1893 return NULL;
1894 }
1895
1896 l2cap_chan_hold(chan);
1897
1898 l2cap_pi(sk)->chan = chan;
1899
1900 return sk;
1901}
1902
1903static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1904 int kern)
1905{
1906 struct sock *sk;
1907
1908 BT_DBG("sock %p", sock);
1909
1910 sock->state = SS_UNCONNECTED;
1911
1912 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1913 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1914 return -ESOCKTNOSUPPORT;
1915
1916 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1917 return -EPERM;
1918
1919 sock->ops = &l2cap_sock_ops;
1920
1921 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
1922 if (!sk)
1923 return -ENOMEM;
1924
1925 l2cap_sock_init(sk, NULL);
1926 bt_sock_link(&l2cap_sk_list, sk);
1927 return 0;
1928}
1929
1930static const struct proto_ops l2cap_sock_ops = {
1931 .family = PF_BLUETOOTH,
1932 .owner = THIS_MODULE,
1933 .release = l2cap_sock_release,
1934 .bind = l2cap_sock_bind,
1935 .connect = l2cap_sock_connect,
1936 .listen = l2cap_sock_listen,
1937 .accept = l2cap_sock_accept,
1938 .getname = l2cap_sock_getname,
1939 .sendmsg = l2cap_sock_sendmsg,
1940 .recvmsg = l2cap_sock_recvmsg,
1941 .poll = bt_sock_poll,
1942 .ioctl = bt_sock_ioctl,
1943 .gettstamp = sock_gettstamp,
1944 .mmap = sock_no_mmap,
1945 .socketpair = sock_no_socketpair,
1946 .shutdown = l2cap_sock_shutdown,
1947 .setsockopt = l2cap_sock_setsockopt,
1948 .getsockopt = l2cap_sock_getsockopt
1949};
1950
1951static const struct net_proto_family l2cap_sock_family_ops = {
1952 .family = PF_BLUETOOTH,
1953 .owner = THIS_MODULE,
1954 .create = l2cap_sock_create,
1955};
1956
1957int __init l2cap_init_sockets(void)
1958{
1959 int err;
1960
1961 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1962
1963 err = proto_register(&l2cap_proto, 0);
1964 if (err < 0)
1965 return err;
1966
1967 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1968 if (err < 0) {
1969 BT_ERR("L2CAP socket registration failed");
1970 goto error;
1971 }
1972
1973 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1974 NULL);
1975 if (err < 0) {
1976 BT_ERR("Failed to create L2CAP proc file");
1977 bt_sock_unregister(BTPROTO_L2CAP);
1978 goto error;
1979 }
1980
1981 BT_INFO("L2CAP socket layer initialized");
1982
1983 return 0;
1984
1985error:
1986 proto_unregister(&l2cap_proto);
1987 return err;
1988}
1989
1990void l2cap_cleanup_sockets(void)
1991{
1992 bt_procfs_cleanup(&init_net, "l2cap");
1993 bt_sock_unregister(BTPROTO_L2CAP);
1994 proto_unregister(&l2cap_proto);
1995}
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}