Loading...
1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth SCO sockets. */
26
27#include <linux/module.h>
28#include <linux/debugfs.h>
29#include <linux/seq_file.h>
30#include <linux/sched/signal.h>
31
32#include <net/bluetooth/bluetooth.h>
33#include <net/bluetooth/hci_core.h>
34#include <net/bluetooth/sco.h>
35
36static bool disable_esco;
37
38static const struct proto_ops sco_sock_ops;
39
40static struct bt_sock_list sco_sk_list = {
41 .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
42};
43
44/* ---- SCO connections ---- */
45struct sco_conn {
46 struct hci_conn *hcon;
47
48 spinlock_t lock;
49 struct sock *sk;
50
51 struct delayed_work timeout_work;
52
53 unsigned int mtu;
54 struct kref ref;
55};
56
57#define sco_conn_lock(c) spin_lock(&c->lock)
58#define sco_conn_unlock(c) spin_unlock(&c->lock)
59
60static void sco_sock_close(struct sock *sk);
61static void sco_sock_kill(struct sock *sk);
62
63/* ----- SCO socket info ----- */
64#define sco_pi(sk) ((struct sco_pinfo *) sk)
65
66struct sco_pinfo {
67 struct bt_sock bt;
68 bdaddr_t src;
69 bdaddr_t dst;
70 __u32 flags;
71 __u16 setting;
72 struct bt_codec codec;
73 struct sco_conn *conn;
74};
75
76/* ---- SCO timers ---- */
77#define SCO_CONN_TIMEOUT (HZ * 40)
78#define SCO_DISCONN_TIMEOUT (HZ * 2)
79
80static void sco_conn_free(struct kref *ref)
81{
82 struct sco_conn *conn = container_of(ref, struct sco_conn, ref);
83
84 BT_DBG("conn %p", conn);
85
86 if (conn->sk)
87 sco_pi(conn->sk)->conn = NULL;
88
89 if (conn->hcon) {
90 conn->hcon->sco_data = NULL;
91 hci_conn_drop(conn->hcon);
92 }
93
94 /* Ensure no more work items will run since hci_conn has been dropped */
95 disable_delayed_work_sync(&conn->timeout_work);
96
97 kfree(conn);
98}
99
100static void sco_conn_put(struct sco_conn *conn)
101{
102 if (!conn)
103 return;
104
105 BT_DBG("conn %p refcnt %d", conn, kref_read(&conn->ref));
106
107 kref_put(&conn->ref, sco_conn_free);
108}
109
110static struct sco_conn *sco_conn_hold_unless_zero(struct sco_conn *conn)
111{
112 if (!conn)
113 return NULL;
114
115 BT_DBG("conn %p refcnt %u", conn, kref_read(&conn->ref));
116
117 if (!kref_get_unless_zero(&conn->ref))
118 return NULL;
119
120 return conn;
121}
122
123static struct sock *sco_sock_hold(struct sco_conn *conn)
124{
125 if (!conn || !bt_sock_linked(&sco_sk_list, conn->sk))
126 return NULL;
127
128 sock_hold(conn->sk);
129
130 return conn->sk;
131}
132
133static void sco_sock_timeout(struct work_struct *work)
134{
135 struct sco_conn *conn = container_of(work, struct sco_conn,
136 timeout_work.work);
137 struct sock *sk;
138
139 conn = sco_conn_hold_unless_zero(conn);
140 if (!conn)
141 return;
142
143 sco_conn_lock(conn);
144 if (!conn->hcon) {
145 sco_conn_unlock(conn);
146 sco_conn_put(conn);
147 return;
148 }
149 sk = sco_sock_hold(conn);
150 sco_conn_unlock(conn);
151 sco_conn_put(conn);
152
153 if (!sk)
154 return;
155
156 BT_DBG("sock %p state %d", sk, sk->sk_state);
157
158 lock_sock(sk);
159 sk->sk_err = ETIMEDOUT;
160 sk->sk_state_change(sk);
161 release_sock(sk);
162 sock_put(sk);
163}
164
165static void sco_sock_set_timer(struct sock *sk, long timeout)
166{
167 if (!sco_pi(sk)->conn)
168 return;
169
170 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
171 cancel_delayed_work(&sco_pi(sk)->conn->timeout_work);
172 schedule_delayed_work(&sco_pi(sk)->conn->timeout_work, timeout);
173}
174
175static void sco_sock_clear_timer(struct sock *sk)
176{
177 if (!sco_pi(sk)->conn)
178 return;
179
180 BT_DBG("sock %p state %d", sk, sk->sk_state);
181 cancel_delayed_work(&sco_pi(sk)->conn->timeout_work);
182}
183
184/* ---- SCO connections ---- */
185static struct sco_conn *sco_conn_add(struct hci_conn *hcon)
186{
187 struct sco_conn *conn = hcon->sco_data;
188
189 conn = sco_conn_hold_unless_zero(conn);
190 if (conn) {
191 if (!conn->hcon) {
192 sco_conn_lock(conn);
193 conn->hcon = hcon;
194 sco_conn_unlock(conn);
195 }
196 return conn;
197 }
198
199 conn = kzalloc(sizeof(struct sco_conn), GFP_KERNEL);
200 if (!conn)
201 return NULL;
202
203 kref_init(&conn->ref);
204 spin_lock_init(&conn->lock);
205 INIT_DELAYED_WORK(&conn->timeout_work, sco_sock_timeout);
206
207 hcon->sco_data = conn;
208 conn->hcon = hcon;
209 conn->mtu = hcon->mtu;
210
211 if (hcon->mtu > 0)
212 conn->mtu = hcon->mtu;
213 else
214 conn->mtu = 60;
215
216 BT_DBG("hcon %p conn %p", hcon, conn);
217
218 return conn;
219}
220
221/* Delete channel.
222 * Must be called on the locked socket. */
223static void sco_chan_del(struct sock *sk, int err)
224{
225 struct sco_conn *conn;
226
227 conn = sco_pi(sk)->conn;
228 sco_pi(sk)->conn = NULL;
229
230 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
231
232 if (conn) {
233 sco_conn_lock(conn);
234 conn->sk = NULL;
235 sco_conn_unlock(conn);
236 sco_conn_put(conn);
237 }
238
239 sk->sk_state = BT_CLOSED;
240 sk->sk_err = err;
241 sk->sk_state_change(sk);
242
243 sock_set_flag(sk, SOCK_ZAPPED);
244}
245
246static void sco_conn_del(struct hci_conn *hcon, int err)
247{
248 struct sco_conn *conn = hcon->sco_data;
249 struct sock *sk;
250
251 conn = sco_conn_hold_unless_zero(conn);
252 if (!conn)
253 return;
254
255 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
256
257 sco_conn_lock(conn);
258 sk = sco_sock_hold(conn);
259 sco_conn_unlock(conn);
260 sco_conn_put(conn);
261
262 if (!sk) {
263 sco_conn_put(conn);
264 return;
265 }
266
267 /* Kill socket */
268 lock_sock(sk);
269 sco_sock_clear_timer(sk);
270 sco_chan_del(sk, err);
271 release_sock(sk);
272 sock_put(sk);
273}
274
275static void __sco_chan_add(struct sco_conn *conn, struct sock *sk,
276 struct sock *parent)
277{
278 BT_DBG("conn %p", conn);
279
280 sco_pi(sk)->conn = conn;
281 conn->sk = sk;
282
283 if (parent)
284 bt_accept_enqueue(parent, sk, true);
285}
286
287static int sco_chan_add(struct sco_conn *conn, struct sock *sk,
288 struct sock *parent)
289{
290 int err = 0;
291
292 sco_conn_lock(conn);
293 if (conn->sk)
294 err = -EBUSY;
295 else
296 __sco_chan_add(conn, sk, parent);
297
298 sco_conn_unlock(conn);
299 return err;
300}
301
302static int sco_connect(struct sock *sk)
303{
304 struct sco_conn *conn;
305 struct hci_conn *hcon;
306 struct hci_dev *hdev;
307 int err, type;
308
309 BT_DBG("%pMR -> %pMR", &sco_pi(sk)->src, &sco_pi(sk)->dst);
310
311 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src, BDADDR_BREDR);
312 if (!hdev)
313 return -EHOSTUNREACH;
314
315 hci_dev_lock(hdev);
316
317 if (lmp_esco_capable(hdev) && !disable_esco)
318 type = ESCO_LINK;
319 else
320 type = SCO_LINK;
321
322 switch (sco_pi(sk)->setting & SCO_AIRMODE_MASK) {
323 case SCO_AIRMODE_TRANSP:
324 if (!lmp_transp_capable(hdev) || !lmp_esco_capable(hdev)) {
325 err = -EOPNOTSUPP;
326 goto unlock;
327 }
328 break;
329 }
330
331 hcon = hci_connect_sco(hdev, type, &sco_pi(sk)->dst,
332 sco_pi(sk)->setting, &sco_pi(sk)->codec,
333 sk->sk_sndtimeo);
334 if (IS_ERR(hcon)) {
335 err = PTR_ERR(hcon);
336 goto unlock;
337 }
338
339 conn = sco_conn_add(hcon);
340 if (!conn) {
341 hci_conn_drop(hcon);
342 err = -ENOMEM;
343 goto unlock;
344 }
345
346 lock_sock(sk);
347
348 err = sco_chan_add(conn, sk, NULL);
349 if (err) {
350 release_sock(sk);
351 goto unlock;
352 }
353
354 /* Update source addr of the socket */
355 bacpy(&sco_pi(sk)->src, &hcon->src);
356
357 if (hcon->state == BT_CONNECTED) {
358 sco_sock_clear_timer(sk);
359 sk->sk_state = BT_CONNECTED;
360 } else {
361 sk->sk_state = BT_CONNECT;
362 sco_sock_set_timer(sk, sk->sk_sndtimeo);
363 }
364
365 release_sock(sk);
366
367unlock:
368 hci_dev_unlock(hdev);
369 hci_dev_put(hdev);
370 return err;
371}
372
373static int sco_send_frame(struct sock *sk, struct sk_buff *skb)
374{
375 struct sco_conn *conn = sco_pi(sk)->conn;
376 int len = skb->len;
377
378 /* Check outgoing MTU */
379 if (len > conn->mtu)
380 return -EINVAL;
381
382 BT_DBG("sk %p len %d", sk, len);
383
384 hci_send_sco(conn->hcon, skb);
385
386 return len;
387}
388
389static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
390{
391 struct sock *sk;
392
393 sco_conn_lock(conn);
394 sk = conn->sk;
395 sco_conn_unlock(conn);
396
397 if (!sk)
398 goto drop;
399
400 BT_DBG("sk %p len %u", sk, skb->len);
401
402 if (sk->sk_state != BT_CONNECTED)
403 goto drop;
404
405 if (!sock_queue_rcv_skb(sk, skb))
406 return;
407
408drop:
409 kfree_skb(skb);
410}
411
412/* -------- Socket interface ---------- */
413static struct sock *__sco_get_sock_listen_by_addr(bdaddr_t *ba)
414{
415 struct sock *sk;
416
417 sk_for_each(sk, &sco_sk_list.head) {
418 if (sk->sk_state != BT_LISTEN)
419 continue;
420
421 if (!bacmp(&sco_pi(sk)->src, ba))
422 return sk;
423 }
424
425 return NULL;
426}
427
428/* Find socket listening on source bdaddr.
429 * Returns closest match.
430 */
431static struct sock *sco_get_sock_listen(bdaddr_t *src)
432{
433 struct sock *sk = NULL, *sk1 = NULL;
434
435 read_lock(&sco_sk_list.lock);
436
437 sk_for_each(sk, &sco_sk_list.head) {
438 if (sk->sk_state != BT_LISTEN)
439 continue;
440
441 /* Exact match. */
442 if (!bacmp(&sco_pi(sk)->src, src))
443 break;
444
445 /* Closest match */
446 if (!bacmp(&sco_pi(sk)->src, BDADDR_ANY))
447 sk1 = sk;
448 }
449
450 read_unlock(&sco_sk_list.lock);
451
452 return sk ? sk : sk1;
453}
454
455static void sco_sock_destruct(struct sock *sk)
456{
457 BT_DBG("sk %p", sk);
458
459 sco_conn_put(sco_pi(sk)->conn);
460
461 skb_queue_purge(&sk->sk_receive_queue);
462 skb_queue_purge(&sk->sk_write_queue);
463}
464
465static void sco_sock_cleanup_listen(struct sock *parent)
466{
467 struct sock *sk;
468
469 BT_DBG("parent %p", parent);
470
471 /* Close not yet accepted channels */
472 while ((sk = bt_accept_dequeue(parent, NULL))) {
473 sco_sock_close(sk);
474 sco_sock_kill(sk);
475 }
476
477 parent->sk_state = BT_CLOSED;
478 sock_set_flag(parent, SOCK_ZAPPED);
479}
480
481/* Kill socket (only if zapped and orphan)
482 * Must be called on unlocked socket.
483 */
484static void sco_sock_kill(struct sock *sk)
485{
486 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
487 return;
488
489 BT_DBG("sk %p state %d", sk, sk->sk_state);
490
491 /* Kill poor orphan */
492 bt_sock_unlink(&sco_sk_list, sk);
493 sock_set_flag(sk, SOCK_DEAD);
494 sock_put(sk);
495}
496
497static void __sco_sock_close(struct sock *sk)
498{
499 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
500
501 switch (sk->sk_state) {
502 case BT_LISTEN:
503 sco_sock_cleanup_listen(sk);
504 break;
505
506 case BT_CONNECTED:
507 case BT_CONFIG:
508 case BT_CONNECT2:
509 case BT_CONNECT:
510 case BT_DISCONN:
511 sco_chan_del(sk, ECONNRESET);
512 break;
513
514 default:
515 sock_set_flag(sk, SOCK_ZAPPED);
516 break;
517 }
518
519}
520
521/* Must be called on unlocked socket. */
522static void sco_sock_close(struct sock *sk)
523{
524 lock_sock(sk);
525 sco_sock_clear_timer(sk);
526 __sco_sock_close(sk);
527 release_sock(sk);
528}
529
530static void sco_sock_init(struct sock *sk, struct sock *parent)
531{
532 BT_DBG("sk %p", sk);
533
534 if (parent) {
535 sk->sk_type = parent->sk_type;
536 bt_sk(sk)->flags = bt_sk(parent)->flags;
537 security_sk_clone(parent, sk);
538 }
539}
540
541static struct proto sco_proto = {
542 .name = "SCO",
543 .owner = THIS_MODULE,
544 .obj_size = sizeof(struct sco_pinfo)
545};
546
547static struct sock *sco_sock_alloc(struct net *net, struct socket *sock,
548 int proto, gfp_t prio, int kern)
549{
550 struct sock *sk;
551
552 sk = bt_sock_alloc(net, sock, &sco_proto, proto, prio, kern);
553 if (!sk)
554 return NULL;
555
556 sk->sk_destruct = sco_sock_destruct;
557 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
558
559 sco_pi(sk)->setting = BT_VOICE_CVSD_16BIT;
560 sco_pi(sk)->codec.id = BT_CODEC_CVSD;
561 sco_pi(sk)->codec.cid = 0xffff;
562 sco_pi(sk)->codec.vid = 0xffff;
563 sco_pi(sk)->codec.data_path = 0x00;
564
565 bt_sock_link(&sco_sk_list, sk);
566 return sk;
567}
568
569static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
570 int kern)
571{
572 struct sock *sk;
573
574 BT_DBG("sock %p", sock);
575
576 sock->state = SS_UNCONNECTED;
577
578 if (sock->type != SOCK_SEQPACKET)
579 return -ESOCKTNOSUPPORT;
580
581 sock->ops = &sco_sock_ops;
582
583 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
584 if (!sk)
585 return -ENOMEM;
586
587 sco_sock_init(sk, NULL);
588 return 0;
589}
590
591static int sco_sock_bind(struct socket *sock, struct sockaddr *addr,
592 int addr_len)
593{
594 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
595 struct sock *sk = sock->sk;
596 int err = 0;
597
598 if (!addr || addr_len < sizeof(struct sockaddr_sco) ||
599 addr->sa_family != AF_BLUETOOTH)
600 return -EINVAL;
601
602 BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
603
604 lock_sock(sk);
605
606 if (sk->sk_state != BT_OPEN) {
607 err = -EBADFD;
608 goto done;
609 }
610
611 if (sk->sk_type != SOCK_SEQPACKET) {
612 err = -EINVAL;
613 goto done;
614 }
615
616 bacpy(&sco_pi(sk)->src, &sa->sco_bdaddr);
617
618 sk->sk_state = BT_BOUND;
619
620done:
621 release_sock(sk);
622 return err;
623}
624
625static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
626{
627 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
628 struct sock *sk = sock->sk;
629 int err;
630
631 BT_DBG("sk %p", sk);
632
633 if (alen < sizeof(struct sockaddr_sco) ||
634 addr->sa_family != AF_BLUETOOTH)
635 return -EINVAL;
636
637 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
638 return -EBADFD;
639
640 if (sk->sk_type != SOCK_SEQPACKET)
641 err = -EINVAL;
642
643 lock_sock(sk);
644 /* Set destination address and psm */
645 bacpy(&sco_pi(sk)->dst, &sa->sco_bdaddr);
646 release_sock(sk);
647
648 err = sco_connect(sk);
649 if (err)
650 return err;
651
652 lock_sock(sk);
653
654 err = bt_sock_wait_state(sk, BT_CONNECTED,
655 sock_sndtimeo(sk, flags & O_NONBLOCK));
656
657 release_sock(sk);
658 return err;
659}
660
661static int sco_sock_listen(struct socket *sock, int backlog)
662{
663 struct sock *sk = sock->sk;
664 bdaddr_t *src = &sco_pi(sk)->src;
665 int err = 0;
666
667 BT_DBG("sk %p backlog %d", sk, backlog);
668
669 lock_sock(sk);
670
671 if (sk->sk_state != BT_BOUND) {
672 err = -EBADFD;
673 goto done;
674 }
675
676 if (sk->sk_type != SOCK_SEQPACKET) {
677 err = -EINVAL;
678 goto done;
679 }
680
681 write_lock(&sco_sk_list.lock);
682
683 if (__sco_get_sock_listen_by_addr(src)) {
684 err = -EADDRINUSE;
685 goto unlock;
686 }
687
688 sk->sk_max_ack_backlog = backlog;
689 sk->sk_ack_backlog = 0;
690
691 sk->sk_state = BT_LISTEN;
692
693unlock:
694 write_unlock(&sco_sk_list.lock);
695
696done:
697 release_sock(sk);
698 return err;
699}
700
701static int sco_sock_accept(struct socket *sock, struct socket *newsock,
702 struct proto_accept_arg *arg)
703{
704 DEFINE_WAIT_FUNC(wait, woken_wake_function);
705 struct sock *sk = sock->sk, *ch;
706 long timeo;
707 int err = 0;
708
709 lock_sock(sk);
710
711 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
712
713 BT_DBG("sk %p timeo %ld", sk, timeo);
714
715 /* Wait for an incoming connection. (wake-one). */
716 add_wait_queue_exclusive(sk_sleep(sk), &wait);
717 while (1) {
718 if (sk->sk_state != BT_LISTEN) {
719 err = -EBADFD;
720 break;
721 }
722
723 ch = bt_accept_dequeue(sk, newsock);
724 if (ch)
725 break;
726
727 if (!timeo) {
728 err = -EAGAIN;
729 break;
730 }
731
732 if (signal_pending(current)) {
733 err = sock_intr_errno(timeo);
734 break;
735 }
736
737 release_sock(sk);
738
739 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
740 lock_sock(sk);
741 }
742 remove_wait_queue(sk_sleep(sk), &wait);
743
744 if (err)
745 goto done;
746
747 newsock->state = SS_CONNECTED;
748
749 BT_DBG("new socket %p", ch);
750
751done:
752 release_sock(sk);
753 return err;
754}
755
756static int sco_sock_getname(struct socket *sock, struct sockaddr *addr,
757 int peer)
758{
759 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
760 struct sock *sk = sock->sk;
761
762 BT_DBG("sock %p, sk %p", sock, sk);
763
764 addr->sa_family = AF_BLUETOOTH;
765
766 if (peer)
767 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->dst);
768 else
769 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->src);
770
771 return sizeof(struct sockaddr_sco);
772}
773
774static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
775 size_t len)
776{
777 struct sock *sk = sock->sk;
778 struct sk_buff *skb;
779 int err;
780
781 BT_DBG("sock %p, sk %p", sock, sk);
782
783 err = sock_error(sk);
784 if (err)
785 return err;
786
787 if (msg->msg_flags & MSG_OOB)
788 return -EOPNOTSUPP;
789
790 skb = bt_skb_sendmsg(sk, msg, len, len, 0, 0);
791 if (IS_ERR(skb))
792 return PTR_ERR(skb);
793
794 lock_sock(sk);
795
796 if (sk->sk_state == BT_CONNECTED)
797 err = sco_send_frame(sk, skb);
798 else
799 err = -ENOTCONN;
800
801 release_sock(sk);
802
803 if (err < 0)
804 kfree_skb(skb);
805 return err;
806}
807
808static void sco_conn_defer_accept(struct hci_conn *conn, u16 setting)
809{
810 struct hci_dev *hdev = conn->hdev;
811
812 BT_DBG("conn %p", conn);
813
814 conn->state = BT_CONFIG;
815
816 if (!lmp_esco_capable(hdev)) {
817 struct hci_cp_accept_conn_req cp;
818
819 bacpy(&cp.bdaddr, &conn->dst);
820 cp.role = 0x00; /* Ignored */
821
822 hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp);
823 } else {
824 struct hci_cp_accept_sync_conn_req cp;
825
826 bacpy(&cp.bdaddr, &conn->dst);
827 cp.pkt_type = cpu_to_le16(conn->pkt_type);
828
829 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
830 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
831 cp.content_format = cpu_to_le16(setting);
832
833 switch (setting & SCO_AIRMODE_MASK) {
834 case SCO_AIRMODE_TRANSP:
835 if (conn->pkt_type & ESCO_2EV3)
836 cp.max_latency = cpu_to_le16(0x0008);
837 else
838 cp.max_latency = cpu_to_le16(0x000D);
839 cp.retrans_effort = 0x02;
840 break;
841 case SCO_AIRMODE_CVSD:
842 cp.max_latency = cpu_to_le16(0xffff);
843 cp.retrans_effort = 0xff;
844 break;
845 default:
846 /* use CVSD settings as fallback */
847 cp.max_latency = cpu_to_le16(0xffff);
848 cp.retrans_effort = 0xff;
849 break;
850 }
851
852 hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ,
853 sizeof(cp), &cp);
854 }
855}
856
857static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
858 size_t len, int flags)
859{
860 struct sock *sk = sock->sk;
861 struct sco_pinfo *pi = sco_pi(sk);
862
863 lock_sock(sk);
864
865 if (sk->sk_state == BT_CONNECT2 &&
866 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
867 sco_conn_defer_accept(pi->conn->hcon, pi->setting);
868 sk->sk_state = BT_CONFIG;
869
870 release_sock(sk);
871 return 0;
872 }
873
874 release_sock(sk);
875
876 return bt_sock_recvmsg(sock, msg, len, flags);
877}
878
879static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
880 sockptr_t optval, unsigned int optlen)
881{
882 struct sock *sk = sock->sk;
883 int err = 0;
884 struct bt_voice voice;
885 u32 opt;
886 struct bt_codecs *codecs;
887 struct hci_dev *hdev;
888 __u8 buffer[255];
889
890 BT_DBG("sk %p", sk);
891
892 lock_sock(sk);
893
894 switch (optname) {
895
896 case BT_DEFER_SETUP:
897 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
898 err = -EINVAL;
899 break;
900 }
901
902 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
903 if (err)
904 break;
905
906 if (opt)
907 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
908 else
909 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
910 break;
911
912 case BT_VOICE:
913 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
914 sk->sk_state != BT_CONNECT2) {
915 err = -EINVAL;
916 break;
917 }
918
919 voice.setting = sco_pi(sk)->setting;
920
921 err = copy_safe_from_sockptr(&voice, sizeof(voice), optval,
922 optlen);
923 if (err)
924 break;
925
926 sco_pi(sk)->setting = voice.setting;
927 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src,
928 BDADDR_BREDR);
929 if (!hdev) {
930 err = -EBADFD;
931 break;
932 }
933
934 switch (sco_pi(sk)->setting & SCO_AIRMODE_MASK) {
935 case SCO_AIRMODE_TRANSP:
936 if (enhanced_sync_conn_capable(hdev))
937 sco_pi(sk)->codec.id = BT_CODEC_TRANSPARENT;
938 break;
939 }
940
941 hci_dev_put(hdev);
942 break;
943
944 case BT_PKT_STATUS:
945 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
946 if (err)
947 break;
948
949 if (opt)
950 set_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
951 else
952 clear_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
953 break;
954
955 case BT_CODEC:
956 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
957 sk->sk_state != BT_CONNECT2) {
958 err = -EINVAL;
959 break;
960 }
961
962 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src,
963 BDADDR_BREDR);
964 if (!hdev) {
965 err = -EBADFD;
966 break;
967 }
968
969 if (!hci_dev_test_flag(hdev, HCI_OFFLOAD_CODECS_ENABLED)) {
970 hci_dev_put(hdev);
971 err = -EOPNOTSUPP;
972 break;
973 }
974
975 if (!hdev->get_data_path_id) {
976 hci_dev_put(hdev);
977 err = -EOPNOTSUPP;
978 break;
979 }
980
981 if (optlen < sizeof(struct bt_codecs) ||
982 optlen > sizeof(buffer)) {
983 hci_dev_put(hdev);
984 err = -EINVAL;
985 break;
986 }
987
988 err = copy_struct_from_sockptr(buffer, sizeof(buffer), optval,
989 optlen);
990 if (err) {
991 hci_dev_put(hdev);
992 break;
993 }
994
995 codecs = (void *)buffer;
996
997 if (codecs->num_codecs > 1) {
998 hci_dev_put(hdev);
999 err = -EINVAL;
1000 break;
1001 }
1002
1003 sco_pi(sk)->codec = codecs->codecs[0];
1004 hci_dev_put(hdev);
1005 break;
1006
1007 default:
1008 err = -ENOPROTOOPT;
1009 break;
1010 }
1011
1012 release_sock(sk);
1013 return err;
1014}
1015
1016static int sco_sock_getsockopt_old(struct socket *sock, int optname,
1017 char __user *optval, int __user *optlen)
1018{
1019 struct sock *sk = sock->sk;
1020 struct sco_options opts;
1021 struct sco_conninfo cinfo;
1022 int err = 0;
1023 size_t len;
1024
1025 BT_DBG("sk %p", sk);
1026
1027 if (get_user(len, optlen))
1028 return -EFAULT;
1029
1030 lock_sock(sk);
1031
1032 switch (optname) {
1033 case SCO_OPTIONS:
1034 if (sk->sk_state != BT_CONNECTED &&
1035 !(sk->sk_state == BT_CONNECT2 &&
1036 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
1037 err = -ENOTCONN;
1038 break;
1039 }
1040
1041 opts.mtu = sco_pi(sk)->conn->mtu;
1042
1043 BT_DBG("mtu %u", opts.mtu);
1044
1045 len = min(len, sizeof(opts));
1046 if (copy_to_user(optval, (char *)&opts, len))
1047 err = -EFAULT;
1048
1049 break;
1050
1051 case SCO_CONNINFO:
1052 if (sk->sk_state != BT_CONNECTED &&
1053 !(sk->sk_state == BT_CONNECT2 &&
1054 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
1055 err = -ENOTCONN;
1056 break;
1057 }
1058
1059 memset(&cinfo, 0, sizeof(cinfo));
1060 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
1061 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
1062
1063 len = min(len, sizeof(cinfo));
1064 if (copy_to_user(optval, (char *)&cinfo, len))
1065 err = -EFAULT;
1066
1067 break;
1068
1069 default:
1070 err = -ENOPROTOOPT;
1071 break;
1072 }
1073
1074 release_sock(sk);
1075 return err;
1076}
1077
1078static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
1079 char __user *optval, int __user *optlen)
1080{
1081 struct sock *sk = sock->sk;
1082 int len, err = 0;
1083 struct bt_voice voice;
1084 u32 phys;
1085 int buf_len;
1086 struct codec_list *c;
1087 u8 num_codecs, i, __user *ptr;
1088 struct hci_dev *hdev;
1089 struct hci_codec_caps *caps;
1090 struct bt_codec codec;
1091
1092 BT_DBG("sk %p", sk);
1093
1094 if (level == SOL_SCO)
1095 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
1096
1097 if (get_user(len, optlen))
1098 return -EFAULT;
1099
1100 lock_sock(sk);
1101
1102 switch (optname) {
1103
1104 case BT_DEFER_SETUP:
1105 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1106 err = -EINVAL;
1107 break;
1108 }
1109
1110 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
1111 (u32 __user *)optval))
1112 err = -EFAULT;
1113
1114 break;
1115
1116 case BT_VOICE:
1117 voice.setting = sco_pi(sk)->setting;
1118
1119 len = min_t(unsigned int, len, sizeof(voice));
1120 if (copy_to_user(optval, (char *)&voice, len))
1121 err = -EFAULT;
1122
1123 break;
1124
1125 case BT_PHY:
1126 if (sk->sk_state != BT_CONNECTED) {
1127 err = -ENOTCONN;
1128 break;
1129 }
1130
1131 phys = hci_conn_get_phy(sco_pi(sk)->conn->hcon);
1132
1133 if (put_user(phys, (u32 __user *) optval))
1134 err = -EFAULT;
1135 break;
1136
1137 case BT_PKT_STATUS:
1138 if (put_user(test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags),
1139 (int __user *)optval))
1140 err = -EFAULT;
1141 break;
1142
1143 case BT_SNDMTU:
1144 case BT_RCVMTU:
1145 if (sk->sk_state != BT_CONNECTED) {
1146 err = -ENOTCONN;
1147 break;
1148 }
1149
1150 if (put_user(sco_pi(sk)->conn->mtu, (u32 __user *)optval))
1151 err = -EFAULT;
1152 break;
1153
1154 case BT_CODEC:
1155 num_codecs = 0;
1156 buf_len = 0;
1157
1158 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src, BDADDR_BREDR);
1159 if (!hdev) {
1160 err = -EBADFD;
1161 break;
1162 }
1163
1164 if (!hci_dev_test_flag(hdev, HCI_OFFLOAD_CODECS_ENABLED)) {
1165 hci_dev_put(hdev);
1166 err = -EOPNOTSUPP;
1167 break;
1168 }
1169
1170 if (!hdev->get_data_path_id) {
1171 hci_dev_put(hdev);
1172 err = -EOPNOTSUPP;
1173 break;
1174 }
1175
1176 release_sock(sk);
1177
1178 /* find total buffer size required to copy codec + caps */
1179 hci_dev_lock(hdev);
1180 list_for_each_entry(c, &hdev->local_codecs, list) {
1181 if (c->transport != HCI_TRANSPORT_SCO_ESCO)
1182 continue;
1183 num_codecs++;
1184 for (i = 0, caps = c->caps; i < c->num_caps; i++) {
1185 buf_len += 1 + caps->len;
1186 caps = (void *)&caps->data[caps->len];
1187 }
1188 buf_len += sizeof(struct bt_codec);
1189 }
1190 hci_dev_unlock(hdev);
1191
1192 buf_len += sizeof(struct bt_codecs);
1193 if (buf_len > len) {
1194 hci_dev_put(hdev);
1195 return -ENOBUFS;
1196 }
1197 ptr = optval;
1198
1199 if (put_user(num_codecs, ptr)) {
1200 hci_dev_put(hdev);
1201 return -EFAULT;
1202 }
1203 ptr += sizeof(num_codecs);
1204
1205 /* Iterate all the codecs supported over SCO and populate
1206 * codec data
1207 */
1208 hci_dev_lock(hdev);
1209 list_for_each_entry(c, &hdev->local_codecs, list) {
1210 if (c->transport != HCI_TRANSPORT_SCO_ESCO)
1211 continue;
1212
1213 codec.id = c->id;
1214 codec.cid = c->cid;
1215 codec.vid = c->vid;
1216 err = hdev->get_data_path_id(hdev, &codec.data_path);
1217 if (err < 0)
1218 break;
1219 codec.num_caps = c->num_caps;
1220 if (copy_to_user(ptr, &codec, sizeof(codec))) {
1221 err = -EFAULT;
1222 break;
1223 }
1224 ptr += sizeof(codec);
1225
1226 /* find codec capabilities data length */
1227 len = 0;
1228 for (i = 0, caps = c->caps; i < c->num_caps; i++) {
1229 len += 1 + caps->len;
1230 caps = (void *)&caps->data[caps->len];
1231 }
1232
1233 /* copy codec capabilities data */
1234 if (len && copy_to_user(ptr, c->caps, len)) {
1235 err = -EFAULT;
1236 break;
1237 }
1238 ptr += len;
1239 }
1240
1241 hci_dev_unlock(hdev);
1242 hci_dev_put(hdev);
1243
1244 lock_sock(sk);
1245
1246 if (!err && put_user(buf_len, optlen))
1247 err = -EFAULT;
1248
1249 break;
1250
1251 default:
1252 err = -ENOPROTOOPT;
1253 break;
1254 }
1255
1256 release_sock(sk);
1257 return err;
1258}
1259
1260static int sco_sock_shutdown(struct socket *sock, int how)
1261{
1262 struct sock *sk = sock->sk;
1263 int err = 0;
1264
1265 BT_DBG("sock %p, sk %p", sock, sk);
1266
1267 if (!sk)
1268 return 0;
1269
1270 sock_hold(sk);
1271 lock_sock(sk);
1272
1273 if (!sk->sk_shutdown) {
1274 sk->sk_shutdown = SHUTDOWN_MASK;
1275 sco_sock_clear_timer(sk);
1276 __sco_sock_close(sk);
1277
1278 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1279 !(current->flags & PF_EXITING))
1280 err = bt_sock_wait_state(sk, BT_CLOSED,
1281 sk->sk_lingertime);
1282 }
1283
1284 release_sock(sk);
1285 sock_put(sk);
1286
1287 return err;
1288}
1289
1290static int sco_sock_release(struct socket *sock)
1291{
1292 struct sock *sk = sock->sk;
1293 int err = 0;
1294
1295 BT_DBG("sock %p, sk %p", sock, sk);
1296
1297 if (!sk)
1298 return 0;
1299
1300 sco_sock_close(sk);
1301
1302 if (sock_flag(sk, SOCK_LINGER) && READ_ONCE(sk->sk_lingertime) &&
1303 !(current->flags & PF_EXITING)) {
1304 lock_sock(sk);
1305 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1306 release_sock(sk);
1307 }
1308
1309 sock_orphan(sk);
1310 sco_sock_kill(sk);
1311 return err;
1312}
1313
1314static void sco_conn_ready(struct sco_conn *conn)
1315{
1316 struct sock *parent;
1317 struct sock *sk = conn->sk;
1318
1319 BT_DBG("conn %p", conn);
1320
1321 if (sk) {
1322 lock_sock(sk);
1323 sco_sock_clear_timer(sk);
1324 sk->sk_state = BT_CONNECTED;
1325 sk->sk_state_change(sk);
1326 release_sock(sk);
1327 } else {
1328 sco_conn_lock(conn);
1329
1330 if (!conn->hcon) {
1331 sco_conn_unlock(conn);
1332 return;
1333 }
1334
1335 parent = sco_get_sock_listen(&conn->hcon->src);
1336 if (!parent) {
1337 sco_conn_unlock(conn);
1338 return;
1339 }
1340
1341 lock_sock(parent);
1342
1343 sk = sco_sock_alloc(sock_net(parent), NULL,
1344 BTPROTO_SCO, GFP_ATOMIC, 0);
1345 if (!sk) {
1346 release_sock(parent);
1347 sco_conn_unlock(conn);
1348 return;
1349 }
1350
1351 sco_sock_init(sk, parent);
1352
1353 bacpy(&sco_pi(sk)->src, &conn->hcon->src);
1354 bacpy(&sco_pi(sk)->dst, &conn->hcon->dst);
1355
1356 hci_conn_hold(conn->hcon);
1357 __sco_chan_add(conn, sk, parent);
1358
1359 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1360 sk->sk_state = BT_CONNECT2;
1361 else
1362 sk->sk_state = BT_CONNECTED;
1363
1364 /* Wake up parent */
1365 parent->sk_data_ready(parent);
1366
1367 release_sock(parent);
1368
1369 sco_conn_unlock(conn);
1370 }
1371}
1372
1373/* ----- SCO interface with lower layer (HCI) ----- */
1374int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1375{
1376 struct sock *sk;
1377 int lm = 0;
1378
1379 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1380
1381 /* Find listening sockets */
1382 read_lock(&sco_sk_list.lock);
1383 sk_for_each(sk, &sco_sk_list.head) {
1384 if (sk->sk_state != BT_LISTEN)
1385 continue;
1386
1387 if (!bacmp(&sco_pi(sk)->src, &hdev->bdaddr) ||
1388 !bacmp(&sco_pi(sk)->src, BDADDR_ANY)) {
1389 lm |= HCI_LM_ACCEPT;
1390
1391 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1392 *flags |= HCI_PROTO_DEFER;
1393 break;
1394 }
1395 }
1396 read_unlock(&sco_sk_list.lock);
1397
1398 return lm;
1399}
1400
1401static bool sco_match(struct hci_conn *hcon)
1402{
1403 return hcon->type == SCO_LINK || hcon->type == ESCO_LINK;
1404}
1405
1406static void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
1407{
1408 BT_DBG("hcon %p bdaddr %pMR status %u", hcon, &hcon->dst, status);
1409
1410 if (!status) {
1411 struct sco_conn *conn;
1412
1413 conn = sco_conn_add(hcon);
1414 if (conn)
1415 sco_conn_ready(conn);
1416 } else
1417 sco_conn_del(hcon, bt_to_errno(status));
1418}
1419
1420static void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1421{
1422 BT_DBG("hcon %p reason %d", hcon, reason);
1423
1424 sco_conn_del(hcon, bt_to_errno(reason));
1425}
1426
1427void sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
1428{
1429 struct sco_conn *conn = hcon->sco_data;
1430
1431 if (!conn)
1432 goto drop;
1433
1434 BT_DBG("conn %p len %u", conn, skb->len);
1435
1436 if (skb->len) {
1437 sco_recv_frame(conn, skb);
1438 return;
1439 }
1440
1441drop:
1442 kfree_skb(skb);
1443}
1444
1445static struct hci_cb sco_cb = {
1446 .name = "SCO",
1447 .match = sco_match,
1448 .connect_cfm = sco_connect_cfm,
1449 .disconn_cfm = sco_disconn_cfm,
1450};
1451
1452static int sco_debugfs_show(struct seq_file *f, void *p)
1453{
1454 struct sock *sk;
1455
1456 read_lock(&sco_sk_list.lock);
1457
1458 sk_for_each(sk, &sco_sk_list.head) {
1459 seq_printf(f, "%pMR %pMR %d\n", &sco_pi(sk)->src,
1460 &sco_pi(sk)->dst, sk->sk_state);
1461 }
1462
1463 read_unlock(&sco_sk_list.lock);
1464
1465 return 0;
1466}
1467
1468DEFINE_SHOW_ATTRIBUTE(sco_debugfs);
1469
1470static struct dentry *sco_debugfs;
1471
1472static const struct proto_ops sco_sock_ops = {
1473 .family = PF_BLUETOOTH,
1474 .owner = THIS_MODULE,
1475 .release = sco_sock_release,
1476 .bind = sco_sock_bind,
1477 .connect = sco_sock_connect,
1478 .listen = sco_sock_listen,
1479 .accept = sco_sock_accept,
1480 .getname = sco_sock_getname,
1481 .sendmsg = sco_sock_sendmsg,
1482 .recvmsg = sco_sock_recvmsg,
1483 .poll = bt_sock_poll,
1484 .ioctl = bt_sock_ioctl,
1485 .gettstamp = sock_gettstamp,
1486 .mmap = sock_no_mmap,
1487 .socketpair = sock_no_socketpair,
1488 .shutdown = sco_sock_shutdown,
1489 .setsockopt = sco_sock_setsockopt,
1490 .getsockopt = sco_sock_getsockopt
1491};
1492
1493static const struct net_proto_family sco_sock_family_ops = {
1494 .family = PF_BLUETOOTH,
1495 .owner = THIS_MODULE,
1496 .create = sco_sock_create,
1497};
1498
1499int __init sco_init(void)
1500{
1501 int err;
1502
1503 BUILD_BUG_ON(sizeof(struct sockaddr_sco) > sizeof(struct sockaddr));
1504
1505 err = proto_register(&sco_proto, 0);
1506 if (err < 0)
1507 return err;
1508
1509 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1510 if (err < 0) {
1511 BT_ERR("SCO socket registration failed");
1512 goto error;
1513 }
1514
1515 err = bt_procfs_init(&init_net, "sco", &sco_sk_list, NULL);
1516 if (err < 0) {
1517 BT_ERR("Failed to create SCO proc file");
1518 bt_sock_unregister(BTPROTO_SCO);
1519 goto error;
1520 }
1521
1522 BT_INFO("SCO socket layer initialized");
1523
1524 hci_register_cb(&sco_cb);
1525
1526 if (IS_ERR_OR_NULL(bt_debugfs))
1527 return 0;
1528
1529 sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs,
1530 NULL, &sco_debugfs_fops);
1531
1532 return 0;
1533
1534error:
1535 proto_unregister(&sco_proto);
1536 return err;
1537}
1538
1539void sco_exit(void)
1540{
1541 bt_procfs_cleanup(&init_net, "sco");
1542
1543 debugfs_remove(sco_debugfs);
1544
1545 hci_unregister_cb(&sco_cb);
1546
1547 bt_sock_unregister(BTPROTO_SCO);
1548
1549 proto_unregister(&sco_proto);
1550}
1551
1552module_param(disable_esco, bool, 0644);
1553MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");
1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth SCO sockets. */
26
27#include <linux/module.h>
28#include <linux/debugfs.h>
29#include <linux/seq_file.h>
30#include <linux/sched/signal.h>
31
32#include <net/bluetooth/bluetooth.h>
33#include <net/bluetooth/hci_core.h>
34#include <net/bluetooth/sco.h>
35
36static bool disable_esco;
37
38static const struct proto_ops sco_sock_ops;
39
40static struct bt_sock_list sco_sk_list = {
41 .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
42};
43
44/* ---- SCO connections ---- */
45struct sco_conn {
46 struct hci_conn *hcon;
47
48 spinlock_t lock;
49 struct sock *sk;
50
51 struct delayed_work timeout_work;
52
53 unsigned int mtu;
54};
55
56#define sco_conn_lock(c) spin_lock(&c->lock)
57#define sco_conn_unlock(c) spin_unlock(&c->lock)
58
59static void sco_sock_close(struct sock *sk);
60static void sco_sock_kill(struct sock *sk);
61
62/* ----- SCO socket info ----- */
63#define sco_pi(sk) ((struct sco_pinfo *) sk)
64
65struct sco_pinfo {
66 struct bt_sock bt;
67 bdaddr_t src;
68 bdaddr_t dst;
69 __u32 flags;
70 __u16 setting;
71 struct bt_codec codec;
72 struct sco_conn *conn;
73};
74
75/* ---- SCO timers ---- */
76#define SCO_CONN_TIMEOUT (HZ * 40)
77#define SCO_DISCONN_TIMEOUT (HZ * 2)
78
79static void sco_sock_timeout(struct work_struct *work)
80{
81 struct sco_conn *conn = container_of(work, struct sco_conn,
82 timeout_work.work);
83 struct sock *sk;
84
85 sco_conn_lock(conn);
86 sk = conn->sk;
87 if (sk)
88 sock_hold(sk);
89 sco_conn_unlock(conn);
90
91 if (!sk)
92 return;
93
94 BT_DBG("sock %p state %d", sk, sk->sk_state);
95
96 lock_sock(sk);
97 sk->sk_err = ETIMEDOUT;
98 sk->sk_state_change(sk);
99 release_sock(sk);
100 sock_put(sk);
101}
102
103static void sco_sock_set_timer(struct sock *sk, long timeout)
104{
105 if (!sco_pi(sk)->conn)
106 return;
107
108 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
109 cancel_delayed_work(&sco_pi(sk)->conn->timeout_work);
110 schedule_delayed_work(&sco_pi(sk)->conn->timeout_work, timeout);
111}
112
113static void sco_sock_clear_timer(struct sock *sk)
114{
115 if (!sco_pi(sk)->conn)
116 return;
117
118 BT_DBG("sock %p state %d", sk, sk->sk_state);
119 cancel_delayed_work(&sco_pi(sk)->conn->timeout_work);
120}
121
122/* ---- SCO connections ---- */
123static struct sco_conn *sco_conn_add(struct hci_conn *hcon)
124{
125 struct hci_dev *hdev = hcon->hdev;
126 struct sco_conn *conn = hcon->sco_data;
127
128 if (conn) {
129 if (!conn->hcon)
130 conn->hcon = hcon;
131 return conn;
132 }
133
134 conn = kzalloc(sizeof(struct sco_conn), GFP_KERNEL);
135 if (!conn)
136 return NULL;
137
138 spin_lock_init(&conn->lock);
139 INIT_DELAYED_WORK(&conn->timeout_work, sco_sock_timeout);
140
141 hcon->sco_data = conn;
142 conn->hcon = hcon;
143
144 if (hdev->sco_mtu > 0)
145 conn->mtu = hdev->sco_mtu;
146 else
147 conn->mtu = 60;
148
149 BT_DBG("hcon %p conn %p", hcon, conn);
150
151 return conn;
152}
153
154/* Delete channel.
155 * Must be called on the locked socket. */
156static void sco_chan_del(struct sock *sk, int err)
157{
158 struct sco_conn *conn;
159
160 conn = sco_pi(sk)->conn;
161
162 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
163
164 if (conn) {
165 sco_conn_lock(conn);
166 conn->sk = NULL;
167 sco_pi(sk)->conn = NULL;
168 sco_conn_unlock(conn);
169
170 if (conn->hcon)
171 hci_conn_drop(conn->hcon);
172 }
173
174 sk->sk_state = BT_CLOSED;
175 sk->sk_err = err;
176 sk->sk_state_change(sk);
177
178 sock_set_flag(sk, SOCK_ZAPPED);
179}
180
181static void sco_conn_del(struct hci_conn *hcon, int err)
182{
183 struct sco_conn *conn = hcon->sco_data;
184 struct sock *sk;
185
186 if (!conn)
187 return;
188
189 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
190
191 /* Kill socket */
192 sco_conn_lock(conn);
193 sk = conn->sk;
194 if (sk)
195 sock_hold(sk);
196 sco_conn_unlock(conn);
197
198 if (sk) {
199 lock_sock(sk);
200 sco_sock_clear_timer(sk);
201 sco_chan_del(sk, err);
202 release_sock(sk);
203 sock_put(sk);
204 }
205
206 /* Ensure no more work items will run before freeing conn. */
207 cancel_delayed_work_sync(&conn->timeout_work);
208
209 hcon->sco_data = NULL;
210 kfree(conn);
211}
212
213static void __sco_chan_add(struct sco_conn *conn, struct sock *sk,
214 struct sock *parent)
215{
216 BT_DBG("conn %p", conn);
217
218 sco_pi(sk)->conn = conn;
219 conn->sk = sk;
220
221 if (parent)
222 bt_accept_enqueue(parent, sk, true);
223}
224
225static int sco_chan_add(struct sco_conn *conn, struct sock *sk,
226 struct sock *parent)
227{
228 int err = 0;
229
230 sco_conn_lock(conn);
231 if (conn->sk)
232 err = -EBUSY;
233 else
234 __sco_chan_add(conn, sk, parent);
235
236 sco_conn_unlock(conn);
237 return err;
238}
239
240static int sco_connect(struct sock *sk)
241{
242 struct sco_conn *conn;
243 struct hci_conn *hcon;
244 struct hci_dev *hdev;
245 int err, type;
246
247 BT_DBG("%pMR -> %pMR", &sco_pi(sk)->src, &sco_pi(sk)->dst);
248
249 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src, BDADDR_BREDR);
250 if (!hdev)
251 return -EHOSTUNREACH;
252
253 hci_dev_lock(hdev);
254
255 if (lmp_esco_capable(hdev) && !disable_esco)
256 type = ESCO_LINK;
257 else
258 type = SCO_LINK;
259
260 if (sco_pi(sk)->setting == BT_VOICE_TRANSPARENT &&
261 (!lmp_transp_capable(hdev) || !lmp_esco_capable(hdev))) {
262 err = -EOPNOTSUPP;
263 goto unlock;
264 }
265
266 hcon = hci_connect_sco(hdev, type, &sco_pi(sk)->dst,
267 sco_pi(sk)->setting, &sco_pi(sk)->codec);
268 if (IS_ERR(hcon)) {
269 err = PTR_ERR(hcon);
270 goto unlock;
271 }
272
273 conn = sco_conn_add(hcon);
274 if (!conn) {
275 hci_conn_drop(hcon);
276 err = -ENOMEM;
277 goto unlock;
278 }
279
280 lock_sock(sk);
281
282 err = sco_chan_add(conn, sk, NULL);
283 if (err) {
284 release_sock(sk);
285 goto unlock;
286 }
287
288 /* Update source addr of the socket */
289 bacpy(&sco_pi(sk)->src, &hcon->src);
290
291 if (hcon->state == BT_CONNECTED) {
292 sco_sock_clear_timer(sk);
293 sk->sk_state = BT_CONNECTED;
294 } else {
295 sk->sk_state = BT_CONNECT;
296 sco_sock_set_timer(sk, sk->sk_sndtimeo);
297 }
298
299 release_sock(sk);
300
301unlock:
302 hci_dev_unlock(hdev);
303 hci_dev_put(hdev);
304 return err;
305}
306
307static int sco_send_frame(struct sock *sk, struct sk_buff *skb)
308{
309 struct sco_conn *conn = sco_pi(sk)->conn;
310 int len = skb->len;
311
312 /* Check outgoing MTU */
313 if (len > conn->mtu)
314 return -EINVAL;
315
316 BT_DBG("sk %p len %d", sk, len);
317
318 hci_send_sco(conn->hcon, skb);
319
320 return len;
321}
322
323static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
324{
325 struct sock *sk;
326
327 sco_conn_lock(conn);
328 sk = conn->sk;
329 sco_conn_unlock(conn);
330
331 if (!sk)
332 goto drop;
333
334 BT_DBG("sk %p len %u", sk, skb->len);
335
336 if (sk->sk_state != BT_CONNECTED)
337 goto drop;
338
339 if (!sock_queue_rcv_skb(sk, skb))
340 return;
341
342drop:
343 kfree_skb(skb);
344}
345
346/* -------- Socket interface ---------- */
347static struct sock *__sco_get_sock_listen_by_addr(bdaddr_t *ba)
348{
349 struct sock *sk;
350
351 sk_for_each(sk, &sco_sk_list.head) {
352 if (sk->sk_state != BT_LISTEN)
353 continue;
354
355 if (!bacmp(&sco_pi(sk)->src, ba))
356 return sk;
357 }
358
359 return NULL;
360}
361
362/* Find socket listening on source bdaddr.
363 * Returns closest match.
364 */
365static struct sock *sco_get_sock_listen(bdaddr_t *src)
366{
367 struct sock *sk = NULL, *sk1 = NULL;
368
369 read_lock(&sco_sk_list.lock);
370
371 sk_for_each(sk, &sco_sk_list.head) {
372 if (sk->sk_state != BT_LISTEN)
373 continue;
374
375 /* Exact match. */
376 if (!bacmp(&sco_pi(sk)->src, src))
377 break;
378
379 /* Closest match */
380 if (!bacmp(&sco_pi(sk)->src, BDADDR_ANY))
381 sk1 = sk;
382 }
383
384 read_unlock(&sco_sk_list.lock);
385
386 return sk ? sk : sk1;
387}
388
389static void sco_sock_destruct(struct sock *sk)
390{
391 BT_DBG("sk %p", sk);
392
393 skb_queue_purge(&sk->sk_receive_queue);
394 skb_queue_purge(&sk->sk_write_queue);
395}
396
397static void sco_sock_cleanup_listen(struct sock *parent)
398{
399 struct sock *sk;
400
401 BT_DBG("parent %p", parent);
402
403 /* Close not yet accepted channels */
404 while ((sk = bt_accept_dequeue(parent, NULL))) {
405 sco_sock_close(sk);
406 sco_sock_kill(sk);
407 }
408
409 parent->sk_state = BT_CLOSED;
410 sock_set_flag(parent, SOCK_ZAPPED);
411}
412
413/* Kill socket (only if zapped and orphan)
414 * Must be called on unlocked socket.
415 */
416static void sco_sock_kill(struct sock *sk)
417{
418 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
419 return;
420
421 BT_DBG("sk %p state %d", sk, sk->sk_state);
422
423 /* Kill poor orphan */
424 bt_sock_unlink(&sco_sk_list, sk);
425 sock_set_flag(sk, SOCK_DEAD);
426 sock_put(sk);
427}
428
429static void __sco_sock_close(struct sock *sk)
430{
431 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
432
433 switch (sk->sk_state) {
434 case BT_LISTEN:
435 sco_sock_cleanup_listen(sk);
436 break;
437
438 case BT_CONNECTED:
439 case BT_CONFIG:
440 if (sco_pi(sk)->conn->hcon) {
441 sk->sk_state = BT_DISCONN;
442 sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
443 sco_conn_lock(sco_pi(sk)->conn);
444 hci_conn_drop(sco_pi(sk)->conn->hcon);
445 sco_pi(sk)->conn->hcon = NULL;
446 sco_conn_unlock(sco_pi(sk)->conn);
447 } else
448 sco_chan_del(sk, ECONNRESET);
449 break;
450
451 case BT_CONNECT2:
452 case BT_CONNECT:
453 case BT_DISCONN:
454 sco_chan_del(sk, ECONNRESET);
455 break;
456
457 default:
458 sock_set_flag(sk, SOCK_ZAPPED);
459 break;
460 }
461
462}
463
464/* Must be called on unlocked socket. */
465static void sco_sock_close(struct sock *sk)
466{
467 lock_sock(sk);
468 sco_sock_clear_timer(sk);
469 __sco_sock_close(sk);
470 release_sock(sk);
471}
472
473static void sco_sock_init(struct sock *sk, struct sock *parent)
474{
475 BT_DBG("sk %p", sk);
476
477 if (parent) {
478 sk->sk_type = parent->sk_type;
479 bt_sk(sk)->flags = bt_sk(parent)->flags;
480 security_sk_clone(parent, sk);
481 }
482}
483
484static struct proto sco_proto = {
485 .name = "SCO",
486 .owner = THIS_MODULE,
487 .obj_size = sizeof(struct sco_pinfo)
488};
489
490static struct sock *sco_sock_alloc(struct net *net, struct socket *sock,
491 int proto, gfp_t prio, int kern)
492{
493 struct sock *sk;
494
495 sk = bt_sock_alloc(net, sock, &sco_proto, proto, prio, kern);
496 if (!sk)
497 return NULL;
498
499 sk->sk_destruct = sco_sock_destruct;
500 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
501
502 sco_pi(sk)->setting = BT_VOICE_CVSD_16BIT;
503 sco_pi(sk)->codec.id = BT_CODEC_CVSD;
504 sco_pi(sk)->codec.cid = 0xffff;
505 sco_pi(sk)->codec.vid = 0xffff;
506 sco_pi(sk)->codec.data_path = 0x00;
507
508 bt_sock_link(&sco_sk_list, sk);
509 return sk;
510}
511
512static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
513 int kern)
514{
515 struct sock *sk;
516
517 BT_DBG("sock %p", sock);
518
519 sock->state = SS_UNCONNECTED;
520
521 if (sock->type != SOCK_SEQPACKET)
522 return -ESOCKTNOSUPPORT;
523
524 sock->ops = &sco_sock_ops;
525
526 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
527 if (!sk)
528 return -ENOMEM;
529
530 sco_sock_init(sk, NULL);
531 return 0;
532}
533
534static int sco_sock_bind(struct socket *sock, struct sockaddr *addr,
535 int addr_len)
536{
537 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
538 struct sock *sk = sock->sk;
539 int err = 0;
540
541 if (!addr || addr_len < sizeof(struct sockaddr_sco) ||
542 addr->sa_family != AF_BLUETOOTH)
543 return -EINVAL;
544
545 BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
546
547 lock_sock(sk);
548
549 if (sk->sk_state != BT_OPEN) {
550 err = -EBADFD;
551 goto done;
552 }
553
554 if (sk->sk_type != SOCK_SEQPACKET) {
555 err = -EINVAL;
556 goto done;
557 }
558
559 bacpy(&sco_pi(sk)->src, &sa->sco_bdaddr);
560
561 sk->sk_state = BT_BOUND;
562
563done:
564 release_sock(sk);
565 return err;
566}
567
568static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
569{
570 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
571 struct sock *sk = sock->sk;
572 int err;
573
574 BT_DBG("sk %p", sk);
575
576 if (alen < sizeof(struct sockaddr_sco) ||
577 addr->sa_family != AF_BLUETOOTH)
578 return -EINVAL;
579
580 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
581 return -EBADFD;
582
583 if (sk->sk_type != SOCK_SEQPACKET)
584 err = -EINVAL;
585
586 lock_sock(sk);
587 /* Set destination address and psm */
588 bacpy(&sco_pi(sk)->dst, &sa->sco_bdaddr);
589 release_sock(sk);
590
591 err = sco_connect(sk);
592 if (err)
593 return err;
594
595 lock_sock(sk);
596
597 err = bt_sock_wait_state(sk, BT_CONNECTED,
598 sock_sndtimeo(sk, flags & O_NONBLOCK));
599
600 release_sock(sk);
601 return err;
602}
603
604static int sco_sock_listen(struct socket *sock, int backlog)
605{
606 struct sock *sk = sock->sk;
607 bdaddr_t *src = &sco_pi(sk)->src;
608 int err = 0;
609
610 BT_DBG("sk %p backlog %d", sk, backlog);
611
612 lock_sock(sk);
613
614 if (sk->sk_state != BT_BOUND) {
615 err = -EBADFD;
616 goto done;
617 }
618
619 if (sk->sk_type != SOCK_SEQPACKET) {
620 err = -EINVAL;
621 goto done;
622 }
623
624 write_lock(&sco_sk_list.lock);
625
626 if (__sco_get_sock_listen_by_addr(src)) {
627 err = -EADDRINUSE;
628 goto unlock;
629 }
630
631 sk->sk_max_ack_backlog = backlog;
632 sk->sk_ack_backlog = 0;
633
634 sk->sk_state = BT_LISTEN;
635
636unlock:
637 write_unlock(&sco_sk_list.lock);
638
639done:
640 release_sock(sk);
641 return err;
642}
643
644static int sco_sock_accept(struct socket *sock, struct socket *newsock,
645 int flags, bool kern)
646{
647 DEFINE_WAIT_FUNC(wait, woken_wake_function);
648 struct sock *sk = sock->sk, *ch;
649 long timeo;
650 int err = 0;
651
652 lock_sock(sk);
653
654 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
655
656 BT_DBG("sk %p timeo %ld", sk, timeo);
657
658 /* Wait for an incoming connection. (wake-one). */
659 add_wait_queue_exclusive(sk_sleep(sk), &wait);
660 while (1) {
661 if (sk->sk_state != BT_LISTEN) {
662 err = -EBADFD;
663 break;
664 }
665
666 ch = bt_accept_dequeue(sk, newsock);
667 if (ch)
668 break;
669
670 if (!timeo) {
671 err = -EAGAIN;
672 break;
673 }
674
675 if (signal_pending(current)) {
676 err = sock_intr_errno(timeo);
677 break;
678 }
679
680 release_sock(sk);
681
682 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
683 lock_sock(sk);
684 }
685 remove_wait_queue(sk_sleep(sk), &wait);
686
687 if (err)
688 goto done;
689
690 newsock->state = SS_CONNECTED;
691
692 BT_DBG("new socket %p", ch);
693
694done:
695 release_sock(sk);
696 return err;
697}
698
699static int sco_sock_getname(struct socket *sock, struct sockaddr *addr,
700 int peer)
701{
702 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
703 struct sock *sk = sock->sk;
704
705 BT_DBG("sock %p, sk %p", sock, sk);
706
707 addr->sa_family = AF_BLUETOOTH;
708
709 if (peer)
710 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->dst);
711 else
712 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->src);
713
714 return sizeof(struct sockaddr_sco);
715}
716
717static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
718 size_t len)
719{
720 struct sock *sk = sock->sk;
721 struct sk_buff *skb;
722 int err;
723
724 BT_DBG("sock %p, sk %p", sock, sk);
725
726 err = sock_error(sk);
727 if (err)
728 return err;
729
730 if (msg->msg_flags & MSG_OOB)
731 return -EOPNOTSUPP;
732
733 skb = bt_skb_sendmsg(sk, msg, len, len, 0, 0);
734 if (IS_ERR(skb))
735 return PTR_ERR(skb);
736
737 lock_sock(sk);
738
739 if (sk->sk_state == BT_CONNECTED)
740 err = sco_send_frame(sk, skb);
741 else
742 err = -ENOTCONN;
743
744 release_sock(sk);
745
746 if (err < 0)
747 kfree_skb(skb);
748 return err;
749}
750
751static void sco_conn_defer_accept(struct hci_conn *conn, u16 setting)
752{
753 struct hci_dev *hdev = conn->hdev;
754
755 BT_DBG("conn %p", conn);
756
757 conn->state = BT_CONFIG;
758
759 if (!lmp_esco_capable(hdev)) {
760 struct hci_cp_accept_conn_req cp;
761
762 bacpy(&cp.bdaddr, &conn->dst);
763 cp.role = 0x00; /* Ignored */
764
765 hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp);
766 } else {
767 struct hci_cp_accept_sync_conn_req cp;
768
769 bacpy(&cp.bdaddr, &conn->dst);
770 cp.pkt_type = cpu_to_le16(conn->pkt_type);
771
772 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
773 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
774 cp.content_format = cpu_to_le16(setting);
775
776 switch (setting & SCO_AIRMODE_MASK) {
777 case SCO_AIRMODE_TRANSP:
778 if (conn->pkt_type & ESCO_2EV3)
779 cp.max_latency = cpu_to_le16(0x0008);
780 else
781 cp.max_latency = cpu_to_le16(0x000D);
782 cp.retrans_effort = 0x02;
783 break;
784 case SCO_AIRMODE_CVSD:
785 cp.max_latency = cpu_to_le16(0xffff);
786 cp.retrans_effort = 0xff;
787 break;
788 default:
789 /* use CVSD settings as fallback */
790 cp.max_latency = cpu_to_le16(0xffff);
791 cp.retrans_effort = 0xff;
792 break;
793 }
794
795 hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ,
796 sizeof(cp), &cp);
797 }
798}
799
800static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
801 size_t len, int flags)
802{
803 struct sock *sk = sock->sk;
804 struct sco_pinfo *pi = sco_pi(sk);
805
806 lock_sock(sk);
807
808 if (sk->sk_state == BT_CONNECT2 &&
809 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
810 sco_conn_defer_accept(pi->conn->hcon, pi->setting);
811 sk->sk_state = BT_CONFIG;
812
813 release_sock(sk);
814 return 0;
815 }
816
817 release_sock(sk);
818
819 return bt_sock_recvmsg(sock, msg, len, flags);
820}
821
822static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
823 sockptr_t optval, unsigned int optlen)
824{
825 struct sock *sk = sock->sk;
826 int len, err = 0;
827 struct bt_voice voice;
828 u32 opt;
829 struct bt_codecs *codecs;
830 struct hci_dev *hdev;
831 __u8 buffer[255];
832
833 BT_DBG("sk %p", sk);
834
835 lock_sock(sk);
836
837 switch (optname) {
838
839 case BT_DEFER_SETUP:
840 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
841 err = -EINVAL;
842 break;
843 }
844
845 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
846 err = -EFAULT;
847 break;
848 }
849
850 if (opt)
851 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
852 else
853 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
854 break;
855
856 case BT_VOICE:
857 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
858 sk->sk_state != BT_CONNECT2) {
859 err = -EINVAL;
860 break;
861 }
862
863 voice.setting = sco_pi(sk)->setting;
864
865 len = min_t(unsigned int, sizeof(voice), optlen);
866 if (copy_from_sockptr(&voice, optval, len)) {
867 err = -EFAULT;
868 break;
869 }
870
871 /* Explicitly check for these values */
872 if (voice.setting != BT_VOICE_TRANSPARENT &&
873 voice.setting != BT_VOICE_CVSD_16BIT) {
874 err = -EINVAL;
875 break;
876 }
877
878 sco_pi(sk)->setting = voice.setting;
879 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src,
880 BDADDR_BREDR);
881 if (!hdev) {
882 err = -EBADFD;
883 break;
884 }
885 if (enhanced_sync_conn_capable(hdev) &&
886 voice.setting == BT_VOICE_TRANSPARENT)
887 sco_pi(sk)->codec.id = BT_CODEC_TRANSPARENT;
888 hci_dev_put(hdev);
889 break;
890
891 case BT_PKT_STATUS:
892 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
893 err = -EFAULT;
894 break;
895 }
896
897 if (opt)
898 set_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
899 else
900 clear_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
901 break;
902
903 case BT_CODEC:
904 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
905 sk->sk_state != BT_CONNECT2) {
906 err = -EINVAL;
907 break;
908 }
909
910 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src,
911 BDADDR_BREDR);
912 if (!hdev) {
913 err = -EBADFD;
914 break;
915 }
916
917 if (!hci_dev_test_flag(hdev, HCI_OFFLOAD_CODECS_ENABLED)) {
918 hci_dev_put(hdev);
919 err = -EOPNOTSUPP;
920 break;
921 }
922
923 if (!hdev->get_data_path_id) {
924 hci_dev_put(hdev);
925 err = -EOPNOTSUPP;
926 break;
927 }
928
929 if (optlen < sizeof(struct bt_codecs) ||
930 optlen > sizeof(buffer)) {
931 hci_dev_put(hdev);
932 err = -EINVAL;
933 break;
934 }
935
936 if (copy_from_sockptr(buffer, optval, optlen)) {
937 hci_dev_put(hdev);
938 err = -EFAULT;
939 break;
940 }
941
942 codecs = (void *)buffer;
943
944 if (codecs->num_codecs > 1) {
945 hci_dev_put(hdev);
946 err = -EINVAL;
947 break;
948 }
949
950 sco_pi(sk)->codec = codecs->codecs[0];
951 hci_dev_put(hdev);
952 break;
953
954 default:
955 err = -ENOPROTOOPT;
956 break;
957 }
958
959 release_sock(sk);
960 return err;
961}
962
963static int sco_sock_getsockopt_old(struct socket *sock, int optname,
964 char __user *optval, int __user *optlen)
965{
966 struct sock *sk = sock->sk;
967 struct sco_options opts;
968 struct sco_conninfo cinfo;
969 int len, err = 0;
970
971 BT_DBG("sk %p", sk);
972
973 if (get_user(len, optlen))
974 return -EFAULT;
975
976 lock_sock(sk);
977
978 switch (optname) {
979 case SCO_OPTIONS:
980 if (sk->sk_state != BT_CONNECTED &&
981 !(sk->sk_state == BT_CONNECT2 &&
982 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
983 err = -ENOTCONN;
984 break;
985 }
986
987 opts.mtu = sco_pi(sk)->conn->mtu;
988
989 BT_DBG("mtu %u", opts.mtu);
990
991 len = min_t(unsigned int, len, sizeof(opts));
992 if (copy_to_user(optval, (char *)&opts, len))
993 err = -EFAULT;
994
995 break;
996
997 case SCO_CONNINFO:
998 if (sk->sk_state != BT_CONNECTED &&
999 !(sk->sk_state == BT_CONNECT2 &&
1000 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
1001 err = -ENOTCONN;
1002 break;
1003 }
1004
1005 memset(&cinfo, 0, sizeof(cinfo));
1006 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
1007 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
1008
1009 len = min_t(unsigned int, len, sizeof(cinfo));
1010 if (copy_to_user(optval, (char *)&cinfo, len))
1011 err = -EFAULT;
1012
1013 break;
1014
1015 default:
1016 err = -ENOPROTOOPT;
1017 break;
1018 }
1019
1020 release_sock(sk);
1021 return err;
1022}
1023
1024static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
1025 char __user *optval, int __user *optlen)
1026{
1027 struct sock *sk = sock->sk;
1028 int len, err = 0;
1029 struct bt_voice voice;
1030 u32 phys;
1031 int buf_len;
1032 struct codec_list *c;
1033 u8 num_codecs, i, __user *ptr;
1034 struct hci_dev *hdev;
1035 struct hci_codec_caps *caps;
1036 struct bt_codec codec;
1037
1038 BT_DBG("sk %p", sk);
1039
1040 if (level == SOL_SCO)
1041 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
1042
1043 if (get_user(len, optlen))
1044 return -EFAULT;
1045
1046 lock_sock(sk);
1047
1048 switch (optname) {
1049
1050 case BT_DEFER_SETUP:
1051 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1052 err = -EINVAL;
1053 break;
1054 }
1055
1056 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
1057 (u32 __user *)optval))
1058 err = -EFAULT;
1059
1060 break;
1061
1062 case BT_VOICE:
1063 voice.setting = sco_pi(sk)->setting;
1064
1065 len = min_t(unsigned int, len, sizeof(voice));
1066 if (copy_to_user(optval, (char *)&voice, len))
1067 err = -EFAULT;
1068
1069 break;
1070
1071 case BT_PHY:
1072 if (sk->sk_state != BT_CONNECTED) {
1073 err = -ENOTCONN;
1074 break;
1075 }
1076
1077 phys = hci_conn_get_phy(sco_pi(sk)->conn->hcon);
1078
1079 if (put_user(phys, (u32 __user *) optval))
1080 err = -EFAULT;
1081 break;
1082
1083 case BT_PKT_STATUS:
1084 if (put_user(test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags),
1085 (int __user *)optval))
1086 err = -EFAULT;
1087 break;
1088
1089 case BT_SNDMTU:
1090 case BT_RCVMTU:
1091 if (sk->sk_state != BT_CONNECTED) {
1092 err = -ENOTCONN;
1093 break;
1094 }
1095
1096 if (put_user(sco_pi(sk)->conn->mtu, (u32 __user *)optval))
1097 err = -EFAULT;
1098 break;
1099
1100 case BT_CODEC:
1101 num_codecs = 0;
1102 buf_len = 0;
1103
1104 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src, BDADDR_BREDR);
1105 if (!hdev) {
1106 err = -EBADFD;
1107 break;
1108 }
1109
1110 if (!hci_dev_test_flag(hdev, HCI_OFFLOAD_CODECS_ENABLED)) {
1111 hci_dev_put(hdev);
1112 err = -EOPNOTSUPP;
1113 break;
1114 }
1115
1116 if (!hdev->get_data_path_id) {
1117 hci_dev_put(hdev);
1118 err = -EOPNOTSUPP;
1119 break;
1120 }
1121
1122 release_sock(sk);
1123
1124 /* find total buffer size required to copy codec + caps */
1125 hci_dev_lock(hdev);
1126 list_for_each_entry(c, &hdev->local_codecs, list) {
1127 if (c->transport != HCI_TRANSPORT_SCO_ESCO)
1128 continue;
1129 num_codecs++;
1130 for (i = 0, caps = c->caps; i < c->num_caps; i++) {
1131 buf_len += 1 + caps->len;
1132 caps = (void *)&caps->data[caps->len];
1133 }
1134 buf_len += sizeof(struct bt_codec);
1135 }
1136 hci_dev_unlock(hdev);
1137
1138 buf_len += sizeof(struct bt_codecs);
1139 if (buf_len > len) {
1140 hci_dev_put(hdev);
1141 return -ENOBUFS;
1142 }
1143 ptr = optval;
1144
1145 if (put_user(num_codecs, ptr)) {
1146 hci_dev_put(hdev);
1147 return -EFAULT;
1148 }
1149 ptr += sizeof(num_codecs);
1150
1151 /* Iterate all the codecs supported over SCO and populate
1152 * codec data
1153 */
1154 hci_dev_lock(hdev);
1155 list_for_each_entry(c, &hdev->local_codecs, list) {
1156 if (c->transport != HCI_TRANSPORT_SCO_ESCO)
1157 continue;
1158
1159 codec.id = c->id;
1160 codec.cid = c->cid;
1161 codec.vid = c->vid;
1162 err = hdev->get_data_path_id(hdev, &codec.data_path);
1163 if (err < 0)
1164 break;
1165 codec.num_caps = c->num_caps;
1166 if (copy_to_user(ptr, &codec, sizeof(codec))) {
1167 err = -EFAULT;
1168 break;
1169 }
1170 ptr += sizeof(codec);
1171
1172 /* find codec capabilities data length */
1173 len = 0;
1174 for (i = 0, caps = c->caps; i < c->num_caps; i++) {
1175 len += 1 + caps->len;
1176 caps = (void *)&caps->data[caps->len];
1177 }
1178
1179 /* copy codec capabilities data */
1180 if (len && copy_to_user(ptr, c->caps, len)) {
1181 err = -EFAULT;
1182 break;
1183 }
1184 ptr += len;
1185 }
1186
1187 hci_dev_unlock(hdev);
1188 hci_dev_put(hdev);
1189
1190 lock_sock(sk);
1191
1192 if (!err && put_user(buf_len, optlen))
1193 err = -EFAULT;
1194
1195 break;
1196
1197 default:
1198 err = -ENOPROTOOPT;
1199 break;
1200 }
1201
1202 release_sock(sk);
1203 return err;
1204}
1205
1206static int sco_sock_shutdown(struct socket *sock, int how)
1207{
1208 struct sock *sk = sock->sk;
1209 int err = 0;
1210
1211 BT_DBG("sock %p, sk %p", sock, sk);
1212
1213 if (!sk)
1214 return 0;
1215
1216 sock_hold(sk);
1217 lock_sock(sk);
1218
1219 if (!sk->sk_shutdown) {
1220 sk->sk_shutdown = SHUTDOWN_MASK;
1221 sco_sock_clear_timer(sk);
1222 __sco_sock_close(sk);
1223
1224 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1225 !(current->flags & PF_EXITING))
1226 err = bt_sock_wait_state(sk, BT_CLOSED,
1227 sk->sk_lingertime);
1228 }
1229
1230 release_sock(sk);
1231 sock_put(sk);
1232
1233 return err;
1234}
1235
1236static int sco_sock_release(struct socket *sock)
1237{
1238 struct sock *sk = sock->sk;
1239 int err = 0;
1240
1241 BT_DBG("sock %p, sk %p", sock, sk);
1242
1243 if (!sk)
1244 return 0;
1245
1246 sco_sock_close(sk);
1247
1248 if (sock_flag(sk, SOCK_LINGER) && READ_ONCE(sk->sk_lingertime) &&
1249 !(current->flags & PF_EXITING)) {
1250 lock_sock(sk);
1251 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1252 release_sock(sk);
1253 }
1254
1255 sock_orphan(sk);
1256 sco_sock_kill(sk);
1257 return err;
1258}
1259
1260static void sco_conn_ready(struct sco_conn *conn)
1261{
1262 struct sock *parent;
1263 struct sock *sk = conn->sk;
1264
1265 BT_DBG("conn %p", conn);
1266
1267 if (sk) {
1268 lock_sock(sk);
1269 sco_sock_clear_timer(sk);
1270 sk->sk_state = BT_CONNECTED;
1271 sk->sk_state_change(sk);
1272 release_sock(sk);
1273 } else {
1274 sco_conn_lock(conn);
1275
1276 if (!conn->hcon) {
1277 sco_conn_unlock(conn);
1278 return;
1279 }
1280
1281 parent = sco_get_sock_listen(&conn->hcon->src);
1282 if (!parent) {
1283 sco_conn_unlock(conn);
1284 return;
1285 }
1286
1287 lock_sock(parent);
1288
1289 sk = sco_sock_alloc(sock_net(parent), NULL,
1290 BTPROTO_SCO, GFP_ATOMIC, 0);
1291 if (!sk) {
1292 release_sock(parent);
1293 sco_conn_unlock(conn);
1294 return;
1295 }
1296
1297 sco_sock_init(sk, parent);
1298
1299 bacpy(&sco_pi(sk)->src, &conn->hcon->src);
1300 bacpy(&sco_pi(sk)->dst, &conn->hcon->dst);
1301
1302 hci_conn_hold(conn->hcon);
1303 __sco_chan_add(conn, sk, parent);
1304
1305 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1306 sk->sk_state = BT_CONNECT2;
1307 else
1308 sk->sk_state = BT_CONNECTED;
1309
1310 /* Wake up parent */
1311 parent->sk_data_ready(parent);
1312
1313 release_sock(parent);
1314
1315 sco_conn_unlock(conn);
1316 }
1317}
1318
1319/* ----- SCO interface with lower layer (HCI) ----- */
1320int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1321{
1322 struct sock *sk;
1323 int lm = 0;
1324
1325 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1326
1327 /* Find listening sockets */
1328 read_lock(&sco_sk_list.lock);
1329 sk_for_each(sk, &sco_sk_list.head) {
1330 if (sk->sk_state != BT_LISTEN)
1331 continue;
1332
1333 if (!bacmp(&sco_pi(sk)->src, &hdev->bdaddr) ||
1334 !bacmp(&sco_pi(sk)->src, BDADDR_ANY)) {
1335 lm |= HCI_LM_ACCEPT;
1336
1337 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1338 *flags |= HCI_PROTO_DEFER;
1339 break;
1340 }
1341 }
1342 read_unlock(&sco_sk_list.lock);
1343
1344 return lm;
1345}
1346
1347static void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
1348{
1349 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1350 return;
1351
1352 BT_DBG("hcon %p bdaddr %pMR status %u", hcon, &hcon->dst, status);
1353
1354 if (!status) {
1355 struct sco_conn *conn;
1356
1357 conn = sco_conn_add(hcon);
1358 if (conn)
1359 sco_conn_ready(conn);
1360 } else
1361 sco_conn_del(hcon, bt_to_errno(status));
1362}
1363
1364static void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1365{
1366 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1367 return;
1368
1369 BT_DBG("hcon %p reason %d", hcon, reason);
1370
1371 sco_conn_del(hcon, bt_to_errno(reason));
1372}
1373
1374void sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
1375{
1376 struct sco_conn *conn = hcon->sco_data;
1377
1378 if (!conn)
1379 goto drop;
1380
1381 BT_DBG("conn %p len %u", conn, skb->len);
1382
1383 if (skb->len) {
1384 sco_recv_frame(conn, skb);
1385 return;
1386 }
1387
1388drop:
1389 kfree_skb(skb);
1390}
1391
1392static struct hci_cb sco_cb = {
1393 .name = "SCO",
1394 .connect_cfm = sco_connect_cfm,
1395 .disconn_cfm = sco_disconn_cfm,
1396};
1397
1398static int sco_debugfs_show(struct seq_file *f, void *p)
1399{
1400 struct sock *sk;
1401
1402 read_lock(&sco_sk_list.lock);
1403
1404 sk_for_each(sk, &sco_sk_list.head) {
1405 seq_printf(f, "%pMR %pMR %d\n", &sco_pi(sk)->src,
1406 &sco_pi(sk)->dst, sk->sk_state);
1407 }
1408
1409 read_unlock(&sco_sk_list.lock);
1410
1411 return 0;
1412}
1413
1414DEFINE_SHOW_ATTRIBUTE(sco_debugfs);
1415
1416static struct dentry *sco_debugfs;
1417
1418static const struct proto_ops sco_sock_ops = {
1419 .family = PF_BLUETOOTH,
1420 .owner = THIS_MODULE,
1421 .release = sco_sock_release,
1422 .bind = sco_sock_bind,
1423 .connect = sco_sock_connect,
1424 .listen = sco_sock_listen,
1425 .accept = sco_sock_accept,
1426 .getname = sco_sock_getname,
1427 .sendmsg = sco_sock_sendmsg,
1428 .recvmsg = sco_sock_recvmsg,
1429 .poll = bt_sock_poll,
1430 .ioctl = bt_sock_ioctl,
1431 .gettstamp = sock_gettstamp,
1432 .mmap = sock_no_mmap,
1433 .socketpair = sock_no_socketpair,
1434 .shutdown = sco_sock_shutdown,
1435 .setsockopt = sco_sock_setsockopt,
1436 .getsockopt = sco_sock_getsockopt
1437};
1438
1439static const struct net_proto_family sco_sock_family_ops = {
1440 .family = PF_BLUETOOTH,
1441 .owner = THIS_MODULE,
1442 .create = sco_sock_create,
1443};
1444
1445int __init sco_init(void)
1446{
1447 int err;
1448
1449 BUILD_BUG_ON(sizeof(struct sockaddr_sco) > sizeof(struct sockaddr));
1450
1451 err = proto_register(&sco_proto, 0);
1452 if (err < 0)
1453 return err;
1454
1455 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1456 if (err < 0) {
1457 BT_ERR("SCO socket registration failed");
1458 goto error;
1459 }
1460
1461 err = bt_procfs_init(&init_net, "sco", &sco_sk_list, NULL);
1462 if (err < 0) {
1463 BT_ERR("Failed to create SCO proc file");
1464 bt_sock_unregister(BTPROTO_SCO);
1465 goto error;
1466 }
1467
1468 BT_INFO("SCO socket layer initialized");
1469
1470 hci_register_cb(&sco_cb);
1471
1472 if (IS_ERR_OR_NULL(bt_debugfs))
1473 return 0;
1474
1475 sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs,
1476 NULL, &sco_debugfs_fops);
1477
1478 return 0;
1479
1480error:
1481 proto_unregister(&sco_proto);
1482 return err;
1483}
1484
1485void sco_exit(void)
1486{
1487 bt_procfs_cleanup(&init_net, "sco");
1488
1489 debugfs_remove(sco_debugfs);
1490
1491 hci_unregister_cb(&sco_cb);
1492
1493 bt_sock_unregister(BTPROTO_SCO);
1494
1495 proto_unregister(&sco_proto);
1496}
1497
1498module_param(disable_esco, bool, 0644);
1499MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");