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WIP FPC-III support
[linux/fpc-iii.git] / net / bluetooth / l2cap_sock.c
blobf1b1edd0b6974319dedd22cdc9948bfd99109b2d
1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5 Copyright (C) 2010 Google Inc.
6 Copyright (C) 2011 ProFUSION Embedded Systems
7
8 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License version 2 as
12 published by the Free Software Foundation;
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
17 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
18 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22
23 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
25 SOFTWARE IS DISCLAIMED.
26 */
27
28 /* Bluetooth L2CAP sockets. */
29
30 #include <linux/module.h>
31 #include <linux/export.h>
32 #include <linux/sched/signal.h>
33
34 #include <net/bluetooth/bluetooth.h>
35 #include <net/bluetooth/hci_core.h>
36 #include <net/bluetooth/l2cap.h>
37
38 #include "smp.h"
39
40 static struct bt_sock_list l2cap_sk_list = {
41 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
42 };
43
44 static const struct proto_ops l2cap_sock_ops;
45 static void l2cap_sock_init(struct sock *sk, struct sock *parent);
46 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
47 int proto, gfp_t prio, int kern);
48
49 bool l2cap_is_socket(struct socket *sock)
50 {
51 return sock && sock->ops == &l2cap_sock_ops;
52 }
53 EXPORT_SYMBOL(l2cap_is_socket);
54
55 static int l2cap_validate_bredr_psm(u16 psm)
56 {
57 /* PSM must be odd and lsb of upper byte must be 0 */
58 if ((psm & 0x0101) != 0x0001)
59 return -EINVAL;
60
61 /* Restrict usage of well-known PSMs */
62 if (psm < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE))
63 return -EACCES;
64
65 return 0;
66 }
67
68 static int l2cap_validate_le_psm(u16 psm)
69 {
70 /* Valid LE_PSM ranges are defined only until 0x00ff */
71 if (psm > L2CAP_PSM_LE_DYN_END)
72 return -EINVAL;
73
74 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
75 if (psm < L2CAP_PSM_LE_DYN_START && !capable(CAP_NET_BIND_SERVICE))
76 return -EACCES;
77
78 return 0;
79 }
80
81 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
82 {
83 struct sock *sk = sock->sk;
84 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
85 struct sockaddr_l2 la;
86 int len, err = 0;
87
88 BT_DBG("sk %p", sk);
89
90 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
91 addr->sa_family != AF_BLUETOOTH)
92 return -EINVAL;
93
94 memset(&la, 0, sizeof(la));
95 len = min_t(unsigned int, sizeof(la), alen);
96 memcpy(&la, addr, len);
97
98 if (la.l2_cid && la.l2_psm)
99 return -EINVAL;
100
101 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
102 return -EINVAL;
103
104 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
105 /* We only allow ATT user space socket */
106 if (la.l2_cid &&
107 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
108 return -EINVAL;
109 }
110
111 lock_sock(sk);
112
113 if (sk->sk_state != BT_OPEN) {
114 err = -EBADFD;
115 goto done;
116 }
117
118 if (la.l2_psm) {
119 __u16 psm = __le16_to_cpu(la.l2_psm);
120
121 if (la.l2_bdaddr_type == BDADDR_BREDR)
122 err = l2cap_validate_bredr_psm(psm);
123 else
124 err = l2cap_validate_le_psm(psm);
125
126 if (err)
127 goto done;
128 }
129
130 bacpy(&chan->src, &la.l2_bdaddr);
131 chan->src_type = la.l2_bdaddr_type;
132
133 if (la.l2_cid)
134 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
135 else
136 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
137
138 if (err < 0)
139 goto done;
140
141 switch (chan->chan_type) {
142 case L2CAP_CHAN_CONN_LESS:
143 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP)
144 chan->sec_level = BT_SECURITY_SDP;
145 break;
146 case L2CAP_CHAN_CONN_ORIENTED:
147 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP ||
148 __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM)
149 chan->sec_level = BT_SECURITY_SDP;
150 break;
151 case L2CAP_CHAN_RAW:
152 chan->sec_level = BT_SECURITY_SDP;
153 break;
154 case L2CAP_CHAN_FIXED:
155 /* Fixed channels default to the L2CAP core not holding a
156 * hci_conn reference for them. For fixed channels mapping to
157 * L2CAP sockets we do want to hold a reference so set the
158 * appropriate flag to request it.
159 */
160 set_bit(FLAG_HOLD_HCI_CONN, &chan->flags);
161 break;
162 }
163
164 if (chan->psm && bdaddr_type_is_le(chan->src_type))
165 chan->mode = L2CAP_MODE_LE_FLOWCTL;
166
167 chan->state = BT_BOUND;
168 sk->sk_state = BT_BOUND;
169
170 done:
171 release_sock(sk);
172 return err;
173 }
174
175 static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
176 int alen, int flags)
177 {
178 struct sock *sk = sock->sk;
179 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
180 struct sockaddr_l2 la;
181 int len, err = 0;
182
183 BT_DBG("sk %p", sk);
184
185 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
186 addr->sa_family != AF_BLUETOOTH)
187 return -EINVAL;
188
189 memset(&la, 0, sizeof(la));
190 len = min_t(unsigned int, sizeof(la), alen);
191 memcpy(&la, addr, len);
192
193 if (la.l2_cid && la.l2_psm)
194 return -EINVAL;
195
196 if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
197 return -EINVAL;
198
199 /* Check that the socket wasn't bound to something that
200 * conflicts with the address given to connect(). If chan->src
201 * is BDADDR_ANY it means bind() was never used, in which case
202 * chan->src_type and la.l2_bdaddr_type do not need to match.
203 */
204 if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
205 bdaddr_type_is_le(la.l2_bdaddr_type)) {
206 /* Old user space versions will try to incorrectly bind
207 * the ATT socket using BDADDR_BREDR. We need to accept
208 * this and fix up the source address type only when
209 * both the source CID and destination CID indicate
210 * ATT. Anything else is an invalid combination.
211 */
212 if (chan->scid != L2CAP_CID_ATT ||
213 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
214 return -EINVAL;
215
216 /* We don't have the hdev available here to make a
217 * better decision on random vs public, but since all
218 * user space versions that exhibit this issue anyway do
219 * not support random local addresses assuming public
220 * here is good enough.
221 */
222 chan->src_type = BDADDR_LE_PUBLIC;
223 }
224
225 if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
226 return -EINVAL;
227
228 if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
229 /* We only allow ATT user space socket */
230 if (la.l2_cid &&
231 la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
232 return -EINVAL;
233 }
234
235 if (chan->psm && bdaddr_type_is_le(chan->src_type) && !chan->mode)
236 chan->mode = L2CAP_MODE_LE_FLOWCTL;
237
238 err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
239 &la.l2_bdaddr, la.l2_bdaddr_type);
240 if (err)
241 return err;
242
243 lock_sock(sk);
244
245 err = bt_sock_wait_state(sk, BT_CONNECTED,
246 sock_sndtimeo(sk, flags & O_NONBLOCK));
247
248 release_sock(sk);
249
250 return err;
251 }
252
253 static int l2cap_sock_listen(struct socket *sock, int backlog)
254 {
255 struct sock *sk = sock->sk;
256 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
257 int err = 0;
258
259 BT_DBG("sk %p backlog %d", sk, backlog);
260
261 lock_sock(sk);
262
263 if (sk->sk_state != BT_BOUND) {
264 err = -EBADFD;
265 goto done;
266 }
267
268 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
269 err = -EINVAL;
270 goto done;
271 }
272
273 switch (chan->mode) {
274 case L2CAP_MODE_BASIC:
275 case L2CAP_MODE_LE_FLOWCTL:
276 break;
277 case L2CAP_MODE_EXT_FLOWCTL:
278 if (!enable_ecred) {
279 err = -EOPNOTSUPP;
280 goto done;
281 }
282 break;
283 case L2CAP_MODE_ERTM:
284 case L2CAP_MODE_STREAMING:
285 if (!disable_ertm)
286 break;
287 fallthrough;
288 default:
289 err = -EOPNOTSUPP;
290 goto done;
291 }
292
293 sk->sk_max_ack_backlog = backlog;
294 sk->sk_ack_backlog = 0;
295
296 /* Listening channels need to use nested locking in order not to
297 * cause lockdep warnings when the created child channels end up
298 * being locked in the same thread as the parent channel.
299 */
300 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
301
302 chan->state = BT_LISTEN;
303 sk->sk_state = BT_LISTEN;
304
305 done:
306 release_sock(sk);
307 return err;
308 }
309
310 static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
311 int flags, bool kern)
312 {
313 DEFINE_WAIT_FUNC(wait, woken_wake_function);
314 struct sock *sk = sock->sk, *nsk;
315 long timeo;
316 int err = 0;
317
318 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
319
320 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
321
322 BT_DBG("sk %p timeo %ld", sk, timeo);
323
324 /* Wait for an incoming connection. (wake-one). */
325 add_wait_queue_exclusive(sk_sleep(sk), &wait);
326 while (1) {
327 if (sk->sk_state != BT_LISTEN) {
328 err = -EBADFD;
329 break;
330 }
331
332 nsk = bt_accept_dequeue(sk, newsock);
333 if (nsk)
334 break;
335
336 if (!timeo) {
337 err = -EAGAIN;
338 break;
339 }
340
341 if (signal_pending(current)) {
342 err = sock_intr_errno(timeo);
343 break;
344 }
345
346 release_sock(sk);
347
348 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
349
350 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
351 }
352 remove_wait_queue(sk_sleep(sk), &wait);
353
354 if (err)
355 goto done;
356
357 newsock->state = SS_CONNECTED;
358
359 BT_DBG("new socket %p", nsk);
360
361 done:
362 release_sock(sk);
363 return err;
364 }
365
366 static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
367 int peer)
368 {
369 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
370 struct sock *sk = sock->sk;
371 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
372
373 BT_DBG("sock %p, sk %p", sock, sk);
374
375 if (peer && sk->sk_state != BT_CONNECTED &&
376 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 &&
377 sk->sk_state != BT_CONFIG)
378 return -ENOTCONN;
379
380 memset(la, 0, sizeof(struct sockaddr_l2));
381 addr->sa_family = AF_BLUETOOTH;
382
383 la->l2_psm = chan->psm;
384
385 if (peer) {
386 bacpy(&la->l2_bdaddr, &chan->dst);
387 la->l2_cid = cpu_to_le16(chan->dcid);
388 la->l2_bdaddr_type = chan->dst_type;
389 } else {
390 bacpy(&la->l2_bdaddr, &chan->src);
391 la->l2_cid = cpu_to_le16(chan->scid);
392 la->l2_bdaddr_type = chan->src_type;
393 }
394
395 return sizeof(struct sockaddr_l2);
396 }
397
398 static int l2cap_get_mode(struct l2cap_chan *chan)
399 {
400 switch (chan->mode) {
401 case L2CAP_MODE_BASIC:
402 return BT_MODE_BASIC;
403 case L2CAP_MODE_ERTM:
404 return BT_MODE_ERTM;
405 case L2CAP_MODE_STREAMING:
406 return BT_MODE_STREAMING;
407 case L2CAP_MODE_LE_FLOWCTL:
408 return BT_MODE_LE_FLOWCTL;
409 case L2CAP_MODE_EXT_FLOWCTL:
410 return BT_MODE_EXT_FLOWCTL;
411 }
412
413 return -EINVAL;
414 }
415
416 static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
417 char __user *optval, int __user *optlen)
418 {
419 struct sock *sk = sock->sk;
420 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
421 struct l2cap_options opts;
422 struct l2cap_conninfo cinfo;
423 int len, err = 0;
424 u32 opt;
425
426 BT_DBG("sk %p", sk);
427
428 if (get_user(len, optlen))
429 return -EFAULT;
430
431 lock_sock(sk);
432
433 switch (optname) {
434 case L2CAP_OPTIONS:
435 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
436 * legacy ATT code depends on getsockopt for
437 * L2CAP_OPTIONS we need to let this pass.
438 */
439 if (bdaddr_type_is_le(chan->src_type) &&
440 chan->scid != L2CAP_CID_ATT) {
441 err = -EINVAL;
442 break;
443 }
444
445 /* Only BR/EDR modes are supported here */
446 switch (chan->mode) {
447 case L2CAP_MODE_BASIC:
448 case L2CAP_MODE_ERTM:
449 case L2CAP_MODE_STREAMING:
450 break;
451 default:
452 err = -EINVAL;
453 break;
454 }
455
456 if (err < 0)
457 break;
458
459 memset(&opts, 0, sizeof(opts));
460 opts.imtu = chan->imtu;
461 opts.omtu = chan->omtu;
462 opts.flush_to = chan->flush_to;
463 opts.mode = chan->mode;
464 opts.fcs = chan->fcs;
465 opts.max_tx = chan->max_tx;
466 opts.txwin_size = chan->tx_win;
467
468 BT_DBG("mode 0x%2.2x", chan->mode);
469
470 len = min_t(unsigned int, len, sizeof(opts));
471 if (copy_to_user(optval, (char *) &opts, len))
472 err = -EFAULT;
473
474 break;
475
476 case L2CAP_LM:
477 switch (chan->sec_level) {
478 case BT_SECURITY_LOW:
479 opt = L2CAP_LM_AUTH;
480 break;
481 case BT_SECURITY_MEDIUM:
482 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
483 break;
484 case BT_SECURITY_HIGH:
485 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
486 L2CAP_LM_SECURE;
487 break;
488 case BT_SECURITY_FIPS:
489 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
490 L2CAP_LM_SECURE | L2CAP_LM_FIPS;
491 break;
492 default:
493 opt = 0;
494 break;
495 }
496
497 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
498 opt |= L2CAP_LM_MASTER;
499
500 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
501 opt |= L2CAP_LM_RELIABLE;
502
503 if (put_user(opt, (u32 __user *) optval))
504 err = -EFAULT;
505
506 break;
507
508 case L2CAP_CONNINFO:
509 if (sk->sk_state != BT_CONNECTED &&
510 !(sk->sk_state == BT_CONNECT2 &&
511 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
512 err = -ENOTCONN;
513 break;
514 }
515
516 memset(&cinfo, 0, sizeof(cinfo));
517 cinfo.hci_handle = chan->conn->hcon->handle;
518 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
519
520 len = min_t(unsigned int, len, sizeof(cinfo));
521 if (copy_to_user(optval, (char *) &cinfo, len))
522 err = -EFAULT;
523
524 break;
525
526 default:
527 err = -ENOPROTOOPT;
528 break;
529 }
530
531 release_sock(sk);
532 return err;
533 }
534
535 static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
536 char __user *optval, int __user *optlen)
537 {
538 struct sock *sk = sock->sk;
539 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
540 struct bt_security sec;
541 struct bt_power pwr;
542 u32 phys;
543 int len, mode, err = 0;
544
545 BT_DBG("sk %p", sk);
546
547 if (level == SOL_L2CAP)
548 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
549
550 if (level != SOL_BLUETOOTH)
551 return -ENOPROTOOPT;
552
553 if (get_user(len, optlen))
554 return -EFAULT;
555
556 lock_sock(sk);
557
558 switch (optname) {
559 case BT_SECURITY:
560 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
561 chan->chan_type != L2CAP_CHAN_FIXED &&
562 chan->chan_type != L2CAP_CHAN_RAW) {
563 err = -EINVAL;
564 break;
565 }
566
567 memset(&sec, 0, sizeof(sec));
568 if (chan->conn) {
569 sec.level = chan->conn->hcon->sec_level;
570
571 if (sk->sk_state == BT_CONNECTED)
572 sec.key_size = chan->conn->hcon->enc_key_size;
573 } else {
574 sec.level = chan->sec_level;
575 }
576
577 len = min_t(unsigned int, len, sizeof(sec));
578 if (copy_to_user(optval, (char *) &sec, len))
579 err = -EFAULT;
580
581 break;
582
583 case BT_DEFER_SETUP:
584 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
585 err = -EINVAL;
586 break;
587 }
588
589 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
590 (u32 __user *) optval))
591 err = -EFAULT;
592
593 break;
594
595 case BT_FLUSHABLE:
596 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
597 (u32 __user *) optval))
598 err = -EFAULT;
599
600 break;
601
602 case BT_POWER:
603 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
604 && sk->sk_type != SOCK_RAW) {
605 err = -EINVAL;
606 break;
607 }
608
609 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
610
611 len = min_t(unsigned int, len, sizeof(pwr));
612 if (copy_to_user(optval, (char *) &pwr, len))
613 err = -EFAULT;
614
615 break;
616
617 case BT_CHANNEL_POLICY:
618 if (put_user(chan->chan_policy, (u32 __user *) optval))
619 err = -EFAULT;
620 break;
621
622 case BT_SNDMTU:
623 if (!bdaddr_type_is_le(chan->src_type)) {
624 err = -EINVAL;
625 break;
626 }
627
628 if (sk->sk_state != BT_CONNECTED) {
629 err = -ENOTCONN;
630 break;
631 }
632
633 if (put_user(chan->omtu, (u16 __user *) optval))
634 err = -EFAULT;
635 break;
636
637 case BT_RCVMTU:
638 if (!bdaddr_type_is_le(chan->src_type)) {
639 err = -EINVAL;
640 break;
641 }
642
643 if (put_user(chan->imtu, (u16 __user *) optval))
644 err = -EFAULT;
645 break;
646
647 case BT_PHY:
648 if (sk->sk_state != BT_CONNECTED) {
649 err = -ENOTCONN;
650 break;
651 }
652
653 phys = hci_conn_get_phy(chan->conn->hcon);
654
655 if (put_user(phys, (u32 __user *) optval))
656 err = -EFAULT;
657 break;
658
659 case BT_MODE:
660 if (!enable_ecred) {
661 err = -ENOPROTOOPT;
662 break;
663 }
664
665 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
666 err = -EINVAL;
667 break;
668 }
669
670 mode = l2cap_get_mode(chan);
671 if (mode < 0) {
672 err = mode;
673 break;
674 }
675
676 if (put_user(mode, (u8 __user *) optval))
677 err = -EFAULT;
678 break;
679
680 default:
681 err = -ENOPROTOOPT;
682 break;
683 }
684
685 release_sock(sk);
686 return err;
687 }
688
689 static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
690 {
691 switch (chan->scid) {
692 case L2CAP_CID_ATT:
693 if (mtu < L2CAP_LE_MIN_MTU)
694 return false;
695 break;
696
697 default:
698 if (mtu < L2CAP_DEFAULT_MIN_MTU)
699 return false;
700 }
701
702 return true;
703 }
704
705 static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
706 sockptr_t optval, unsigned int optlen)
707 {
708 struct sock *sk = sock->sk;
709 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
710 struct l2cap_options opts;
711 int len, err = 0;
712 u32 opt;
713
714 BT_DBG("sk %p", sk);
715
716 lock_sock(sk);
717
718 switch (optname) {
719 case L2CAP_OPTIONS:
720 if (bdaddr_type_is_le(chan->src_type)) {
721 err = -EINVAL;
722 break;
723 }
724
725 if (sk->sk_state == BT_CONNECTED) {
726 err = -EINVAL;
727 break;
728 }
729
730 opts.imtu = chan->imtu;
731 opts.omtu = chan->omtu;
732 opts.flush_to = chan->flush_to;
733 opts.mode = chan->mode;
734 opts.fcs = chan->fcs;
735 opts.max_tx = chan->max_tx;
736 opts.txwin_size = chan->tx_win;
737
738 len = min_t(unsigned int, sizeof(opts), optlen);
739 if (copy_from_sockptr(&opts, optval, len)) {
740 err = -EFAULT;
741 break;
742 }
743
744 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
745 err = -EINVAL;
746 break;
747 }
748
749 if (!l2cap_valid_mtu(chan, opts.imtu)) {
750 err = -EINVAL;
751 break;
752 }
753
754 /* Only BR/EDR modes are supported here */
755 switch (opts.mode) {
756 case L2CAP_MODE_BASIC:
757 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
758 break;
759 case L2CAP_MODE_ERTM:
760 case L2CAP_MODE_STREAMING:
761 if (!disable_ertm)
762 break;
763 fallthrough;
764 default:
765 err = -EINVAL;
766 break;
767 }
768
769 if (err < 0)
770 break;
771
772 chan->mode = opts.mode;
773
774 BT_DBG("mode 0x%2.2x", chan->mode);
775
776 chan->imtu = opts.imtu;
777 chan->omtu = opts.omtu;
778 chan->fcs = opts.fcs;
779 chan->max_tx = opts.max_tx;
780 chan->tx_win = opts.txwin_size;
781 chan->flush_to = opts.flush_to;
782 break;
783
784 case L2CAP_LM:
785 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
786 err = -EFAULT;
787 break;
788 }
789
790 if (opt & L2CAP_LM_FIPS) {
791 err = -EINVAL;
792 break;
793 }
794
795 if (opt & L2CAP_LM_AUTH)
796 chan->sec_level = BT_SECURITY_LOW;
797 if (opt & L2CAP_LM_ENCRYPT)
798 chan->sec_level = BT_SECURITY_MEDIUM;
799 if (opt & L2CAP_LM_SECURE)
800 chan->sec_level = BT_SECURITY_HIGH;
801
802 if (opt & L2CAP_LM_MASTER)
803 set_bit(FLAG_ROLE_SWITCH, &chan->flags);
804 else
805 clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
806
807 if (opt & L2CAP_LM_RELIABLE)
808 set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
809 else
810 clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
811 break;
812
813 default:
814 err = -ENOPROTOOPT;
815 break;
816 }
817
818 release_sock(sk);
819 return err;
820 }
821
822 static int l2cap_set_mode(struct l2cap_chan *chan, u8 mode)
823 {
824 switch (mode) {
825 case BT_MODE_BASIC:
826 if (bdaddr_type_is_le(chan->src_type))
827 return -EINVAL;
828 mode = L2CAP_MODE_BASIC;
829 clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
830 break;
831 case BT_MODE_ERTM:
832 if (!disable_ertm || bdaddr_type_is_le(chan->src_type))
833 return -EINVAL;
834 mode = L2CAP_MODE_ERTM;
835 break;
836 case BT_MODE_STREAMING:
837 if (!disable_ertm || bdaddr_type_is_le(chan->src_type))
838 return -EINVAL;
839 mode = L2CAP_MODE_STREAMING;
840 break;
841 case BT_MODE_LE_FLOWCTL:
842 if (!bdaddr_type_is_le(chan->src_type))
843 return -EINVAL;
844 mode = L2CAP_MODE_LE_FLOWCTL;
845 break;
846 case BT_MODE_EXT_FLOWCTL:
847 /* TODO: Add support for ECRED PDUs to BR/EDR */
848 if (!bdaddr_type_is_le(chan->src_type))
849 return -EINVAL;
850 mode = L2CAP_MODE_EXT_FLOWCTL;
851 break;
852 default:
853 return -EINVAL;
854 }
855
856 chan->mode = mode;
857
858 return 0;
859 }
860
861 static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
862 sockptr_t optval, unsigned int optlen)
863 {
864 struct sock *sk = sock->sk;
865 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
866 struct bt_security sec;
867 struct bt_power pwr;
868 struct l2cap_conn *conn;
869 int len, err = 0;
870 u32 opt;
871
872 BT_DBG("sk %p", sk);
873
874 if (level == SOL_L2CAP)
875 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
876
877 if (level != SOL_BLUETOOTH)
878 return -ENOPROTOOPT;
879
880 lock_sock(sk);
881
882 switch (optname) {
883 case BT_SECURITY:
884 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
885 chan->chan_type != L2CAP_CHAN_FIXED &&
886 chan->chan_type != L2CAP_CHAN_RAW) {
887 err = -EINVAL;
888 break;
889 }
890
891 sec.level = BT_SECURITY_LOW;
892
893 len = min_t(unsigned int, sizeof(sec), optlen);
894 if (copy_from_sockptr(&sec, optval, len)) {
895 err = -EFAULT;
896 break;
897 }
898
899 if (sec.level < BT_SECURITY_LOW ||
900 sec.level > BT_SECURITY_FIPS) {
901 err = -EINVAL;
902 break;
903 }
904
905 chan->sec_level = sec.level;
906
907 if (!chan->conn)
908 break;
909
910 conn = chan->conn;
911
912 /* change security for LE channels */
913 if (chan->scid == L2CAP_CID_ATT) {
914 if (smp_conn_security(conn->hcon, sec.level)) {
915 err = -EINVAL;
916 break;
917 }
918
919 set_bit(FLAG_PENDING_SECURITY, &chan->flags);
920 sk->sk_state = BT_CONFIG;
921 chan->state = BT_CONFIG;
922
923 /* or for ACL link */
924 } else if ((sk->sk_state == BT_CONNECT2 &&
925 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
926 sk->sk_state == BT_CONNECTED) {
927 if (!l2cap_chan_check_security(chan, true))
928 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
929 else
930 sk->sk_state_change(sk);
931 } else {
932 err = -EINVAL;
933 }
934 break;
935
936 case BT_DEFER_SETUP:
937 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
938 err = -EINVAL;
939 break;
940 }
941
942 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
943 err = -EFAULT;
944 break;
945 }
946
947 if (opt) {
948 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
949 set_bit(FLAG_DEFER_SETUP, &chan->flags);
950 } else {
951 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
952 clear_bit(FLAG_DEFER_SETUP, &chan->flags);
953 }
954 break;
955
956 case BT_FLUSHABLE:
957 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
958 err = -EFAULT;
959 break;
960 }
961
962 if (opt > BT_FLUSHABLE_ON) {
963 err = -EINVAL;
964 break;
965 }
966
967 if (opt == BT_FLUSHABLE_OFF) {
968 conn = chan->conn;
969 /* proceed further only when we have l2cap_conn and
970 No Flush support in the LM */
971 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
972 err = -EINVAL;
973 break;
974 }
975 }
976
977 if (opt)
978 set_bit(FLAG_FLUSHABLE, &chan->flags);
979 else
980 clear_bit(FLAG_FLUSHABLE, &chan->flags);
981 break;
982
983 case BT_POWER:
984 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
985 chan->chan_type != L2CAP_CHAN_RAW) {
986 err = -EINVAL;
987 break;
988 }
989
990 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
991
992 len = min_t(unsigned int, sizeof(pwr), optlen);
993 if (copy_from_sockptr(&pwr, optval, len)) {
994 err = -EFAULT;
995 break;
996 }
997
998 if (pwr.force_active)
999 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1000 else
1001 clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
1002 break;
1003
1004 case BT_CHANNEL_POLICY:
1005 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
1006 err = -EFAULT;
1007 break;
1008 }
1009
1010 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
1011 err = -EINVAL;
1012 break;
1013 }
1014
1015 if (chan->mode != L2CAP_MODE_ERTM &&
1016 chan->mode != L2CAP_MODE_STREAMING) {
1017 err = -EOPNOTSUPP;
1018 break;
1019 }
1020
1021 chan->chan_policy = (u8) opt;
1022
1023 if (sk->sk_state == BT_CONNECTED &&
1024 chan->move_role == L2CAP_MOVE_ROLE_NONE)
1025 l2cap_move_start(chan);
1026
1027 break;
1028
1029 case BT_SNDMTU:
1030 if (!bdaddr_type_is_le(chan->src_type)) {
1031 err = -EINVAL;
1032 break;
1033 }
1034
1035 /* Setting is not supported as it's the remote side that
1036 * decides this.
1037 */
1038 err = -EPERM;
1039 break;
1040
1041 case BT_RCVMTU:
1042 if (!bdaddr_type_is_le(chan->src_type)) {
1043 err = -EINVAL;
1044 break;
1045 }
1046
1047 if (chan->mode == L2CAP_MODE_LE_FLOWCTL &&
1048 sk->sk_state == BT_CONNECTED) {
1049 err = -EISCONN;
1050 break;
1051 }
1052
1053 if (copy_from_sockptr(&opt, optval, sizeof(u16))) {
1054 err = -EFAULT;
1055 break;
1056 }
1057
1058 if (chan->mode == L2CAP_MODE_EXT_FLOWCTL &&
1059 sk->sk_state == BT_CONNECTED)
1060 err = l2cap_chan_reconfigure(chan, opt);
1061 else
1062 chan->imtu = opt;
1063
1064 break;
1065
1066 case BT_MODE:
1067 if (!enable_ecred) {
1068 err = -ENOPROTOOPT;
1069 break;
1070 }
1071
1072 BT_DBG("sk->sk_state %u", sk->sk_state);
1073
1074 if (sk->sk_state != BT_BOUND) {
1075 err = -EINVAL;
1076 break;
1077 }
1078
1079 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1080 err = -EINVAL;
1081 break;
1082 }
1083
1084 if (copy_from_sockptr(&opt, optval, sizeof(u8))) {
1085 err = -EFAULT;
1086 break;
1087 }
1088
1089 BT_DBG("opt %u", opt);
1090
1091 err = l2cap_set_mode(chan, opt);
1092 if (err)
1093 break;
1094
1095 BT_DBG("mode 0x%2.2x", chan->mode);
1096
1097 break;
1098
1099 default:
1100 err = -ENOPROTOOPT;
1101 break;
1102 }
1103
1104 release_sock(sk);
1105 return err;
1106 }
1107
1108 static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1109 size_t len)
1110 {
1111 struct sock *sk = sock->sk;
1112 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1113 int err;
1114
1115 BT_DBG("sock %p, sk %p", sock, sk);
1116
1117 err = sock_error(sk);
1118 if (err)
1119 return err;
1120
1121 if (msg->msg_flags & MSG_OOB)
1122 return -EOPNOTSUPP;
1123
1124 if (sk->sk_state != BT_CONNECTED)
1125 return -ENOTCONN;
1126
1127 lock_sock(sk);
1128 err = bt_sock_wait_ready(sk, msg->msg_flags);
1129 release_sock(sk);
1130 if (err)
1131 return err;
1132
1133 l2cap_chan_lock(chan);
1134 err = l2cap_chan_send(chan, msg, len);
1135 l2cap_chan_unlock(chan);
1136
1137 return err;
1138 }
1139
1140 static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1141 size_t len, int flags)
1142 {
1143 struct sock *sk = sock->sk;
1144 struct l2cap_pinfo *pi = l2cap_pi(sk);
1145 int err;
1146
1147 lock_sock(sk);
1148
1149 if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
1150 &bt_sk(sk)->flags)) {
1151 if (pi->chan->mode == L2CAP_MODE_EXT_FLOWCTL) {
1152 sk->sk_state = BT_CONNECTED;
1153 pi->chan->state = BT_CONNECTED;
1154 __l2cap_ecred_conn_rsp_defer(pi->chan);
1155 } else if (bdaddr_type_is_le(pi->chan->src_type)) {
1156 sk->sk_state = BT_CONNECTED;
1157 pi->chan->state = BT_CONNECTED;
1158 __l2cap_le_connect_rsp_defer(pi->chan);
1159 } else {
1160 sk->sk_state = BT_CONFIG;
1161 pi->chan->state = BT_CONFIG;
1162 __l2cap_connect_rsp_defer(pi->chan);
1163 }
1164
1165 err = 0;
1166 goto done;
1167 }
1168
1169 release_sock(sk);
1170
1171 if (sock->type == SOCK_STREAM)
1172 err = bt_sock_stream_recvmsg(sock, msg, len, flags);
1173 else
1174 err = bt_sock_recvmsg(sock, msg, len, flags);
1175
1176 if (pi->chan->mode != L2CAP_MODE_ERTM)
1177 return err;
1178
1179 /* Attempt to put pending rx data in the socket buffer */
1180
1181 lock_sock(sk);
1182
1183 if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
1184 goto done;
1185
1186 if (pi->rx_busy_skb) {
1187 if (!__sock_queue_rcv_skb(sk, pi->rx_busy_skb))
1188 pi->rx_busy_skb = NULL;
1189 else
1190 goto done;
1191 }
1192
1193 /* Restore data flow when half of the receive buffer is
1194 * available. This avoids resending large numbers of
1195 * frames.
1196 */
1197 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1198 l2cap_chan_busy(pi->chan, 0);
1199
1200 done:
1201 release_sock(sk);
1202 return err;
1203 }
1204
1205 /* Kill socket (only if zapped and orphan)
1206 * Must be called on unlocked socket, with l2cap channel lock.
1207 */
1208 static void l2cap_sock_kill(struct sock *sk)
1209 {
1210 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1211 return;
1212
1213 BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
1214
1215 /* Kill poor orphan */
1216
1217 l2cap_chan_put(l2cap_pi(sk)->chan);
1218 sock_set_flag(sk, SOCK_DEAD);
1219 sock_put(sk);
1220 }
1221
1222 static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
1223 {
1224 DECLARE_WAITQUEUE(wait, current);
1225 int err = 0;
1226 int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1227 /* Timeout to prevent infinite loop */
1228 unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
1229
1230 add_wait_queue(sk_sleep(sk), &wait);
1231 set_current_state(TASK_INTERRUPTIBLE);
1232 do {
1233 BT_DBG("Waiting for %d ACKs, timeout %04d ms",
1234 chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
1235 jiffies_to_msecs(timeout - jiffies));
1236
1237 if (!timeo)
1238 timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1239
1240 if (signal_pending(current)) {
1241 err = sock_intr_errno(timeo);
1242 break;
1243 }
1244
1245 release_sock(sk);
1246 timeo = schedule_timeout(timeo);
1247 lock_sock(sk);
1248 set_current_state(TASK_INTERRUPTIBLE);
1249
1250 err = sock_error(sk);
1251 if (err)
1252 break;
1253
1254 if (time_after(jiffies, timeout)) {
1255 err = -ENOLINK;
1256 break;
1257 }
1258
1259 } while (chan->unacked_frames > 0 &&
1260 chan->state == BT_CONNECTED);
1261
1262 set_current_state(TASK_RUNNING);
1263 remove_wait_queue(sk_sleep(sk), &wait);
1264 return err;
1265 }
1266
1267 static int l2cap_sock_shutdown(struct socket *sock, int how)
1268 {
1269 struct sock *sk = sock->sk;
1270 struct l2cap_chan *chan;
1271 struct l2cap_conn *conn;
1272 int err = 0;
1273
1274 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1275
1276 /* 'how' parameter is mapped to sk_shutdown as follows:
1277 * SHUT_RD (0) --> RCV_SHUTDOWN (1)
1278 * SHUT_WR (1) --> SEND_SHUTDOWN (2)
1279 * SHUT_RDWR (2) --> SHUTDOWN_MASK (3)
1280 */
1281 how++;
1282
1283 if (!sk)
1284 return 0;
1285
1286 lock_sock(sk);
1287
1288 if ((sk->sk_shutdown & how) == how)
1289 goto shutdown_already;
1290
1291 BT_DBG("Handling sock shutdown");
1292
1293 /* prevent sk structure from being freed whilst unlocked */
1294 sock_hold(sk);
1295
1296 chan = l2cap_pi(sk)->chan;
1297 /* prevent chan structure from being freed whilst unlocked */
1298 l2cap_chan_hold(chan);
1299
1300 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1301
1302 if (chan->mode == L2CAP_MODE_ERTM &&
1303 chan->unacked_frames > 0 &&
1304 chan->state == BT_CONNECTED) {
1305 err = __l2cap_wait_ack(sk, chan);
1306
1307 /* After waiting for ACKs, check whether shutdown
1308 * has already been actioned to close the L2CAP
1309 * link such as by l2cap_disconnection_req().
1310 */
1311 if ((sk->sk_shutdown & how) == how)
1312 goto shutdown_matched;
1313 }
1314
1315 /* Try setting the RCV_SHUTDOWN bit, return early if SEND_SHUTDOWN
1316 * is already set
1317 */
1318 if ((how & RCV_SHUTDOWN) && !(sk->sk_shutdown & RCV_SHUTDOWN)) {
1319 sk->sk_shutdown |= RCV_SHUTDOWN;
1320 if ((sk->sk_shutdown & how) == how)
1321 goto shutdown_matched;
1322 }
1323
1324 sk->sk_shutdown |= SEND_SHUTDOWN;
1325 release_sock(sk);
1326
1327 l2cap_chan_lock(chan);
1328 conn = chan->conn;
1329 if (conn)
1330 /* prevent conn structure from being freed */
1331 l2cap_conn_get(conn);
1332 l2cap_chan_unlock(chan);
1333
1334 if (conn)
1335 /* mutex lock must be taken before l2cap_chan_lock() */
1336 mutex_lock(&conn->chan_lock);
1337
1338 l2cap_chan_lock(chan);
1339 l2cap_chan_close(chan, 0);
1340 l2cap_chan_unlock(chan);
1341
1342 if (conn) {
1343 mutex_unlock(&conn->chan_lock);
1344 l2cap_conn_put(conn);
1345 }
1346
1347 lock_sock(sk);
1348
1349 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1350 !(current->flags & PF_EXITING))
1351 err = bt_sock_wait_state(sk, BT_CLOSED,
1352 sk->sk_lingertime);
1353
1354 shutdown_matched:
1355 l2cap_chan_put(chan);
1356 sock_put(sk);
1357
1358 shutdown_already:
1359 if (!err && sk->sk_err)
1360 err = -sk->sk_err;
1361
1362 release_sock(sk);
1363
1364 BT_DBG("Sock shutdown complete err: %d", err);
1365
1366 return err;
1367 }
1368
1369 static int l2cap_sock_release(struct socket *sock)
1370 {
1371 struct sock *sk = sock->sk;
1372 int err;
1373 struct l2cap_chan *chan;
1374
1375 BT_DBG("sock %p, sk %p", sock, sk);
1376
1377 if (!sk)
1378 return 0;
1379
1380 bt_sock_unlink(&l2cap_sk_list, sk);
1381
1382 err = l2cap_sock_shutdown(sock, SHUT_RDWR);
1383 chan = l2cap_pi(sk)->chan;
1384
1385 l2cap_chan_hold(chan);
1386 l2cap_chan_lock(chan);
1387
1388 sock_orphan(sk);
1389 l2cap_sock_kill(sk);
1390
1391 l2cap_chan_unlock(chan);
1392 l2cap_chan_put(chan);
1393
1394 return err;
1395 }
1396
1397 static void l2cap_sock_cleanup_listen(struct sock *parent)
1398 {
1399 struct sock *sk;
1400
1401 BT_DBG("parent %p state %s", parent,
1402 state_to_string(parent->sk_state));
1403
1404 /* Close not yet accepted channels */
1405 while ((sk = bt_accept_dequeue(parent, NULL))) {
1406 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1407
1408 BT_DBG("child chan %p state %s", chan,
1409 state_to_string(chan->state));
1410
1411 l2cap_chan_hold(chan);
1412 l2cap_chan_lock(chan);
1413
1414 __clear_chan_timer(chan);
1415 l2cap_chan_close(chan, ECONNRESET);
1416 l2cap_sock_kill(sk);
1417
1418 l2cap_chan_unlock(chan);
1419 l2cap_chan_put(chan);
1420 }
1421 }
1422
1423 static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1424 {
1425 struct sock *sk, *parent = chan->data;
1426
1427 lock_sock(parent);
1428
1429 /* Check for backlog size */
1430 if (sk_acceptq_is_full(parent)) {
1431 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1432 release_sock(parent);
1433 return NULL;
1434 }
1435
1436 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1437 GFP_ATOMIC, 0);
1438 if (!sk) {
1439 release_sock(parent);
1440 return NULL;
1441 }
1442
1443 bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1444
1445 l2cap_sock_init(sk, parent);
1446
1447 bt_accept_enqueue(parent, sk, false);
1448
1449 release_sock(parent);
1450
1451 return l2cap_pi(sk)->chan;
1452 }
1453
1454 static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1455 {
1456 struct sock *sk = chan->data;
1457 int err;
1458
1459 lock_sock(sk);
1460
1461 if (l2cap_pi(sk)->rx_busy_skb) {
1462 err = -ENOMEM;
1463 goto done;
1464 }
1465
1466 if (chan->mode != L2CAP_MODE_ERTM &&
1467 chan->mode != L2CAP_MODE_STREAMING) {
1468 /* Even if no filter is attached, we could potentially
1469 * get errors from security modules, etc.
1470 */
1471 err = sk_filter(sk, skb);
1472 if (err)
1473 goto done;
1474 }
1475
1476 err = __sock_queue_rcv_skb(sk, skb);
1477
1478 /* For ERTM, handle one skb that doesn't fit into the recv
1479 * buffer. This is important to do because the data frames
1480 * have already been acked, so the skb cannot be discarded.
1481 *
1482 * Notify the l2cap core that the buffer is full, so the
1483 * LOCAL_BUSY state is entered and no more frames are
1484 * acked and reassembled until there is buffer space
1485 * available.
1486 */
1487 if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1488 l2cap_pi(sk)->rx_busy_skb = skb;
1489 l2cap_chan_busy(chan, 1);
1490 err = 0;
1491 }
1492
1493 done:
1494 release_sock(sk);
1495
1496 return err;
1497 }
1498
1499 static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1500 {
1501 struct sock *sk = chan->data;
1502
1503 l2cap_sock_kill(sk);
1504 }
1505
1506 static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1507 {
1508 struct sock *sk = chan->data;
1509 struct sock *parent;
1510
1511 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1512
1513 /* This callback can be called both for server (BT_LISTEN)
1514 * sockets as well as "normal" ones. To avoid lockdep warnings
1515 * with child socket locking (through l2cap_sock_cleanup_listen)
1516 * we need separation into separate nesting levels. The simplest
1517 * way to accomplish this is to inherit the nesting level used
1518 * for the channel.
1519 */
1520 lock_sock_nested(sk, atomic_read(&chan->nesting));
1521
1522 parent = bt_sk(sk)->parent;
1523
1524 switch (chan->state) {
1525 case BT_OPEN:
1526 case BT_BOUND:
1527 case BT_CLOSED:
1528 break;
1529 case BT_LISTEN:
1530 l2cap_sock_cleanup_listen(sk);
1531 sk->sk_state = BT_CLOSED;
1532 chan->state = BT_CLOSED;
1533
1534 break;
1535 default:
1536 sk->sk_state = BT_CLOSED;
1537 chan->state = BT_CLOSED;
1538
1539 sk->sk_err = err;
1540
1541 if (parent) {
1542 bt_accept_unlink(sk);
1543 parent->sk_data_ready(parent);
1544 } else {
1545 sk->sk_state_change(sk);
1546 }
1547
1548 break;
1549 }
1550 release_sock(sk);
1551
1552 /* Only zap after cleanup to avoid use after free race */
1553 sock_set_flag(sk, SOCK_ZAPPED);
1554
1555 }
1556
1557 static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1558 int err)
1559 {
1560 struct sock *sk = chan->data;
1561
1562 sk->sk_state = state;
1563
1564 if (err)
1565 sk->sk_err = err;
1566 }
1567
1568 static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1569 unsigned long hdr_len,
1570 unsigned long len, int nb)
1571 {
1572 struct sock *sk = chan->data;
1573 struct sk_buff *skb;
1574 int err;
1575
1576 l2cap_chan_unlock(chan);
1577 skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1578 l2cap_chan_lock(chan);
1579
1580 if (!skb)
1581 return ERR_PTR(err);
1582
1583 skb->priority = sk->sk_priority;
1584
1585 bt_cb(skb)->l2cap.chan = chan;
1586
1587 return skb;
1588 }
1589
1590 static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1591 {
1592 struct sock *sk = chan->data;
1593 struct sock *parent;
1594
1595 lock_sock(sk);
1596
1597 parent = bt_sk(sk)->parent;
1598
1599 BT_DBG("sk %p, parent %p", sk, parent);
1600
1601 sk->sk_state = BT_CONNECTED;
1602 sk->sk_state_change(sk);
1603
1604 if (parent)
1605 parent->sk_data_ready(parent);
1606
1607 release_sock(sk);
1608 }
1609
1610 static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1611 {
1612 struct sock *parent, *sk = chan->data;
1613
1614 lock_sock(sk);
1615
1616 parent = bt_sk(sk)->parent;
1617 if (parent)
1618 parent->sk_data_ready(parent);
1619
1620 release_sock(sk);
1621 }
1622
1623 static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1624 {
1625 struct sock *sk = chan->data;
1626
1627 if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1628 sk->sk_state = BT_CONNECTED;
1629 chan->state = BT_CONNECTED;
1630 }
1631
1632 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1633 sk->sk_state_change(sk);
1634 }
1635
1636 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1637 {
1638 struct sock *sk = chan->data;
1639
1640 lock_sock(sk);
1641 sk->sk_shutdown = SHUTDOWN_MASK;
1642 release_sock(sk);
1643 }
1644
1645 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1646 {
1647 struct sock *sk = chan->data;
1648
1649 return sk->sk_sndtimeo;
1650 }
1651
1652 static struct pid *l2cap_sock_get_peer_pid_cb(struct l2cap_chan *chan)
1653 {
1654 struct sock *sk = chan->data;
1655
1656 return sk->sk_peer_pid;
1657 }
1658
1659 static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1660 {
1661 struct sock *sk = chan->data;
1662
1663 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1664 sk->sk_state_change(sk);
1665 }
1666
1667 static int l2cap_sock_filter(struct l2cap_chan *chan, struct sk_buff *skb)
1668 {
1669 struct sock *sk = chan->data;
1670
1671 switch (chan->mode) {
1672 case L2CAP_MODE_ERTM:
1673 case L2CAP_MODE_STREAMING:
1674 return sk_filter(sk, skb);
1675 }
1676
1677 return 0;
1678 }
1679
1680 static const struct l2cap_ops l2cap_chan_ops = {
1681 .name = "L2CAP Socket Interface",
1682 .new_connection = l2cap_sock_new_connection_cb,
1683 .recv = l2cap_sock_recv_cb,
1684 .close = l2cap_sock_close_cb,
1685 .teardown = l2cap_sock_teardown_cb,
1686 .state_change = l2cap_sock_state_change_cb,
1687 .ready = l2cap_sock_ready_cb,
1688 .defer = l2cap_sock_defer_cb,
1689 .resume = l2cap_sock_resume_cb,
1690 .suspend = l2cap_sock_suspend_cb,
1691 .set_shutdown = l2cap_sock_set_shutdown_cb,
1692 .get_sndtimeo = l2cap_sock_get_sndtimeo_cb,
1693 .get_peer_pid = l2cap_sock_get_peer_pid_cb,
1694 .alloc_skb = l2cap_sock_alloc_skb_cb,
1695 .filter = l2cap_sock_filter,
1696 };
1697
1698 static void l2cap_sock_destruct(struct sock *sk)
1699 {
1700 BT_DBG("sk %p", sk);
1701
1702 if (l2cap_pi(sk)->chan)
1703 l2cap_chan_put(l2cap_pi(sk)->chan);
1704
1705 if (l2cap_pi(sk)->rx_busy_skb) {
1706 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1707 l2cap_pi(sk)->rx_busy_skb = NULL;
1708 }
1709
1710 skb_queue_purge(&sk->sk_receive_queue);
1711 skb_queue_purge(&sk->sk_write_queue);
1712 }
1713
1714 static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1715 int *msg_namelen)
1716 {
1717 DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1718
1719 memset(la, 0, sizeof(struct sockaddr_l2));
1720 la->l2_family = AF_BLUETOOTH;
1721 la->l2_psm = bt_cb(skb)->l2cap.psm;
1722 bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr);
1723
1724 *msg_namelen = sizeof(struct sockaddr_l2);
1725 }
1726
1727 static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1728 {
1729 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1730
1731 BT_DBG("sk %p", sk);
1732
1733 if (parent) {
1734 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1735
1736 sk->sk_type = parent->sk_type;
1737 bt_sk(sk)->flags = bt_sk(parent)->flags;
1738
1739 chan->chan_type = pchan->chan_type;
1740 chan->imtu = pchan->imtu;
1741 chan->omtu = pchan->omtu;
1742 chan->conf_state = pchan->conf_state;
1743 chan->mode = pchan->mode;
1744 chan->fcs = pchan->fcs;
1745 chan->max_tx = pchan->max_tx;
1746 chan->tx_win = pchan->tx_win;
1747 chan->tx_win_max = pchan->tx_win_max;
1748 chan->sec_level = pchan->sec_level;
1749 chan->flags = pchan->flags;
1750 chan->tx_credits = pchan->tx_credits;
1751 chan->rx_credits = pchan->rx_credits;
1752
1753 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1754 chan->scid = pchan->scid;
1755 chan->dcid = pchan->scid;
1756 }
1757
1758 security_sk_clone(parent, sk);
1759 } else {
1760 switch (sk->sk_type) {
1761 case SOCK_RAW:
1762 chan->chan_type = L2CAP_CHAN_RAW;
1763 break;
1764 case SOCK_DGRAM:
1765 chan->chan_type = L2CAP_CHAN_CONN_LESS;
1766 bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1767 break;
1768 case SOCK_SEQPACKET:
1769 case SOCK_STREAM:
1770 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1771 break;
1772 }
1773
1774 chan->imtu = L2CAP_DEFAULT_MTU;
1775 chan->omtu = 0;
1776 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1777 chan->mode = L2CAP_MODE_ERTM;
1778 set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1779 } else {
1780 chan->mode = L2CAP_MODE_BASIC;
1781 }
1782
1783 l2cap_chan_set_defaults(chan);
1784 }
1785
1786 /* Default config options */
1787 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1788
1789 chan->data = sk;
1790 chan->ops = &l2cap_chan_ops;
1791 }
1792
1793 static struct proto l2cap_proto = {
1794 .name = "L2CAP",
1795 .owner = THIS_MODULE,
1796 .obj_size = sizeof(struct l2cap_pinfo)
1797 };
1798
1799 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1800 int proto, gfp_t prio, int kern)
1801 {
1802 struct sock *sk;
1803 struct l2cap_chan *chan;
1804
1805 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, kern);
1806 if (!sk)
1807 return NULL;
1808
1809 sock_init_data(sock, sk);
1810 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1811
1812 sk->sk_destruct = l2cap_sock_destruct;
1813 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1814
1815 sock_reset_flag(sk, SOCK_ZAPPED);
1816
1817 sk->sk_protocol = proto;
1818 sk->sk_state = BT_OPEN;
1819
1820 chan = l2cap_chan_create();
1821 if (!chan) {
1822 sk_free(sk);
1823 return NULL;
1824 }
1825
1826 l2cap_chan_hold(chan);
1827
1828 l2cap_pi(sk)->chan = chan;
1829
1830 return sk;
1831 }
1832
1833 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1834 int kern)
1835 {
1836 struct sock *sk;
1837
1838 BT_DBG("sock %p", sock);
1839
1840 sock->state = SS_UNCONNECTED;
1841
1842 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1843 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1844 return -ESOCKTNOSUPPORT;
1845
1846 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1847 return -EPERM;
1848
1849 sock->ops = &l2cap_sock_ops;
1850
1851 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
1852 if (!sk)
1853 return -ENOMEM;
1854
1855 l2cap_sock_init(sk, NULL);
1856 bt_sock_link(&l2cap_sk_list, sk);
1857 return 0;
1858 }
1859
1860 static const struct proto_ops l2cap_sock_ops = {
1861 .family = PF_BLUETOOTH,
1862 .owner = THIS_MODULE,
1863 .release = l2cap_sock_release,
1864 .bind = l2cap_sock_bind,
1865 .connect = l2cap_sock_connect,
1866 .listen = l2cap_sock_listen,
1867 .accept = l2cap_sock_accept,
1868 .getname = l2cap_sock_getname,
1869 .sendmsg = l2cap_sock_sendmsg,
1870 .recvmsg = l2cap_sock_recvmsg,
1871 .poll = bt_sock_poll,
1872 .ioctl = bt_sock_ioctl,
1873 .gettstamp = sock_gettstamp,
1874 .mmap = sock_no_mmap,
1875 .socketpair = sock_no_socketpair,
1876 .shutdown = l2cap_sock_shutdown,
1877 .setsockopt = l2cap_sock_setsockopt,
1878 .getsockopt = l2cap_sock_getsockopt
1879 };
1880
1881 static const struct net_proto_family l2cap_sock_family_ops = {
1882 .family = PF_BLUETOOTH,
1883 .owner = THIS_MODULE,
1884 .create = l2cap_sock_create,
1885 };
1886
1887 int __init l2cap_init_sockets(void)
1888 {
1889 int err;
1890
1891 BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1892
1893 err = proto_register(&l2cap_proto, 0);
1894 if (err < 0)
1895 return err;
1896
1897 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1898 if (err < 0) {
1899 BT_ERR("L2CAP socket registration failed");
1900 goto error;
1901 }
1902
1903 err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1904 NULL);
1905 if (err < 0) {
1906 BT_ERR("Failed to create L2CAP proc file");
1907 bt_sock_unregister(BTPROTO_L2CAP);
1908 goto error;
1909 }
1910
1911 BT_INFO("L2CAP socket layer initialized");
1912
1913 return 0;
1914
1915 error:
1916 proto_unregister(&l2cap_proto);
1917 return err;
1918 }
1919
1920 void l2cap_cleanup_sockets(void)
1921 {
1922 bt_procfs_cleanup(&init_net, "l2cap");
1923 bt_sock_unregister(BTPROTO_L2CAP);
1924 proto_unregister(&l2cap_proto);
1925 }
Linux with added FPC-III support