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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 unsigned int mtu;
52};
53
54#define sco_conn_lock(c) spin_lock(&c->lock);
55#define sco_conn_unlock(c) spin_unlock(&c->lock);
56
57static void sco_sock_close(struct sock *sk);
58static void sco_sock_kill(struct sock *sk);
59
60/* ----- SCO socket info ----- */
61#define sco_pi(sk) ((struct sco_pinfo *) sk)
62
63struct sco_pinfo {
64 struct bt_sock bt;
65 bdaddr_t src;
66 bdaddr_t dst;
67 __u32 flags;
68 __u16 setting;
69 struct sco_conn *conn;
70};
71
72/* ---- SCO timers ---- */
73#define SCO_CONN_TIMEOUT (HZ * 40)
74#define SCO_DISCONN_TIMEOUT (HZ * 2)
75
76static void sco_sock_timeout(struct timer_list *t)
77{
78 struct sock *sk = from_timer(sk, t, sk_timer);
79
80 BT_DBG("sock %p state %d", sk, sk->sk_state);
81
82 bh_lock_sock(sk);
83 sk->sk_err = ETIMEDOUT;
84 sk->sk_state_change(sk);
85 bh_unlock_sock(sk);
86
87 sco_sock_kill(sk);
88 sock_put(sk);
89}
90
91static void sco_sock_set_timer(struct sock *sk, long timeout)
92{
93 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
94 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
95}
96
97static void sco_sock_clear_timer(struct sock *sk)
98{
99 BT_DBG("sock %p state %d", sk, sk->sk_state);
100 sk_stop_timer(sk, &sk->sk_timer);
101}
102
103/* ---- SCO connections ---- */
104static struct sco_conn *sco_conn_add(struct hci_conn *hcon)
105{
106 struct hci_dev *hdev = hcon->hdev;
107 struct sco_conn *conn = hcon->sco_data;
108
109 if (conn)
110 return conn;
111
112 conn = kzalloc(sizeof(struct sco_conn), GFP_KERNEL);
113 if (!conn)
114 return NULL;
115
116 spin_lock_init(&conn->lock);
117
118 hcon->sco_data = conn;
119 conn->hcon = hcon;
120
121 if (hdev->sco_mtu > 0)
122 conn->mtu = hdev->sco_mtu;
123 else
124 conn->mtu = 60;
125
126 BT_DBG("hcon %p conn %p", hcon, conn);
127
128 return conn;
129}
130
131/* Delete channel.
132 * Must be called on the locked socket. */
133static void sco_chan_del(struct sock *sk, int err)
134{
135 struct sco_conn *conn;
136
137 conn = sco_pi(sk)->conn;
138
139 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
140
141 if (conn) {
142 sco_conn_lock(conn);
143 conn->sk = NULL;
144 sco_pi(sk)->conn = NULL;
145 sco_conn_unlock(conn);
146
147 if (conn->hcon)
148 hci_conn_drop(conn->hcon);
149 }
150
151 sk->sk_state = BT_CLOSED;
152 sk->sk_err = err;
153 sk->sk_state_change(sk);
154
155 sock_set_flag(sk, SOCK_ZAPPED);
156}
157
158static void sco_conn_del(struct hci_conn *hcon, int err)
159{
160 struct sco_conn *conn = hcon->sco_data;
161 struct sock *sk;
162
163 if (!conn)
164 return;
165
166 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
167
168 /* Kill socket */
169 sco_conn_lock(conn);
170 sk = conn->sk;
171 sco_conn_unlock(conn);
172
173 if (sk) {
174 sock_hold(sk);
175 bh_lock_sock(sk);
176 sco_sock_clear_timer(sk);
177 sco_chan_del(sk, err);
178 bh_unlock_sock(sk);
179 sco_sock_kill(sk);
180 sock_put(sk);
181 }
182
183 hcon->sco_data = NULL;
184 kfree(conn);
185}
186
187static void __sco_chan_add(struct sco_conn *conn, struct sock *sk,
188 struct sock *parent)
189{
190 BT_DBG("conn %p", conn);
191
192 sco_pi(sk)->conn = conn;
193 conn->sk = sk;
194
195 if (parent)
196 bt_accept_enqueue(parent, sk);
197}
198
199static int sco_chan_add(struct sco_conn *conn, struct sock *sk,
200 struct sock *parent)
201{
202 int err = 0;
203
204 sco_conn_lock(conn);
205 if (conn->sk)
206 err = -EBUSY;
207 else
208 __sco_chan_add(conn, sk, parent);
209
210 sco_conn_unlock(conn);
211 return err;
212}
213
214static int sco_connect(struct sock *sk)
215{
216 struct sco_conn *conn;
217 struct hci_conn *hcon;
218 struct hci_dev *hdev;
219 int err, type;
220
221 BT_DBG("%pMR -> %pMR", &sco_pi(sk)->src, &sco_pi(sk)->dst);
222
223 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src, BDADDR_BREDR);
224 if (!hdev)
225 return -EHOSTUNREACH;
226
227 hci_dev_lock(hdev);
228
229 if (lmp_esco_capable(hdev) && !disable_esco)
230 type = ESCO_LINK;
231 else
232 type = SCO_LINK;
233
234 if (sco_pi(sk)->setting == BT_VOICE_TRANSPARENT &&
235 (!lmp_transp_capable(hdev) || !lmp_esco_capable(hdev))) {
236 err = -EOPNOTSUPP;
237 goto done;
238 }
239
240 hcon = hci_connect_sco(hdev, type, &sco_pi(sk)->dst,
241 sco_pi(sk)->setting);
242 if (IS_ERR(hcon)) {
243 err = PTR_ERR(hcon);
244 goto done;
245 }
246
247 conn = sco_conn_add(hcon);
248 if (!conn) {
249 hci_conn_drop(hcon);
250 err = -ENOMEM;
251 goto done;
252 }
253
254 /* Update source addr of the socket */
255 bacpy(&sco_pi(sk)->src, &hcon->src);
256
257 err = sco_chan_add(conn, sk, NULL);
258 if (err)
259 goto done;
260
261 if (hcon->state == BT_CONNECTED) {
262 sco_sock_clear_timer(sk);
263 sk->sk_state = BT_CONNECTED;
264 } else {
265 sk->sk_state = BT_CONNECT;
266 sco_sock_set_timer(sk, sk->sk_sndtimeo);
267 }
268
269done:
270 hci_dev_unlock(hdev);
271 hci_dev_put(hdev);
272 return err;
273}
274
275static int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
276{
277 struct sco_conn *conn = sco_pi(sk)->conn;
278 struct sk_buff *skb;
279 int err;
280
281 /* Check outgoing MTU */
282 if (len > conn->mtu)
283 return -EINVAL;
284
285 BT_DBG("sk %p len %d", sk, len);
286
287 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
288 if (!skb)
289 return err;
290
291 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
292 kfree_skb(skb);
293 return -EFAULT;
294 }
295
296 hci_send_sco(conn->hcon, skb);
297
298 return len;
299}
300
301static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
302{
303 struct sock *sk;
304
305 sco_conn_lock(conn);
306 sk = conn->sk;
307 sco_conn_unlock(conn);
308
309 if (!sk)
310 goto drop;
311
312 BT_DBG("sk %p len %d", sk, skb->len);
313
314 if (sk->sk_state != BT_CONNECTED)
315 goto drop;
316
317 if (!sock_queue_rcv_skb(sk, skb))
318 return;
319
320drop:
321 kfree_skb(skb);
322}
323
324/* -------- Socket interface ---------- */
325static struct sock *__sco_get_sock_listen_by_addr(bdaddr_t *ba)
326{
327 struct sock *sk;
328
329 sk_for_each(sk, &sco_sk_list.head) {
330 if (sk->sk_state != BT_LISTEN)
331 continue;
332
333 if (!bacmp(&sco_pi(sk)->src, ba))
334 return sk;
335 }
336
337 return NULL;
338}
339
340/* Find socket listening on source bdaddr.
341 * Returns closest match.
342 */
343static struct sock *sco_get_sock_listen(bdaddr_t *src)
344{
345 struct sock *sk = NULL, *sk1 = NULL;
346
347 read_lock(&sco_sk_list.lock);
348
349 sk_for_each(sk, &sco_sk_list.head) {
350 if (sk->sk_state != BT_LISTEN)
351 continue;
352
353 /* Exact match. */
354 if (!bacmp(&sco_pi(sk)->src, src))
355 break;
356
357 /* Closest match */
358 if (!bacmp(&sco_pi(sk)->src, BDADDR_ANY))
359 sk1 = sk;
360 }
361
362 read_unlock(&sco_sk_list.lock);
363
364 return sk ? sk : sk1;
365}
366
367static void sco_sock_destruct(struct sock *sk)
368{
369 BT_DBG("sk %p", sk);
370
371 skb_queue_purge(&sk->sk_receive_queue);
372 skb_queue_purge(&sk->sk_write_queue);
373}
374
375static void sco_sock_cleanup_listen(struct sock *parent)
376{
377 struct sock *sk;
378
379 BT_DBG("parent %p", parent);
380
381 /* Close not yet accepted channels */
382 while ((sk = bt_accept_dequeue(parent, NULL))) {
383 sco_sock_close(sk);
384 sco_sock_kill(sk);
385 }
386
387 parent->sk_state = BT_CLOSED;
388 sock_set_flag(parent, SOCK_ZAPPED);
389}
390
391/* Kill socket (only if zapped and orphan)
392 * Must be called on unlocked socket.
393 */
394static void sco_sock_kill(struct sock *sk)
395{
396 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
397 return;
398
399 BT_DBG("sk %p state %d", sk, sk->sk_state);
400
401 /* Kill poor orphan */
402 bt_sock_unlink(&sco_sk_list, sk);
403 sock_set_flag(sk, SOCK_DEAD);
404 sock_put(sk);
405}
406
407static void __sco_sock_close(struct sock *sk)
408{
409 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
410
411 switch (sk->sk_state) {
412 case BT_LISTEN:
413 sco_sock_cleanup_listen(sk);
414 break;
415
416 case BT_CONNECTED:
417 case BT_CONFIG:
418 if (sco_pi(sk)->conn->hcon) {
419 sk->sk_state = BT_DISCONN;
420 sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
421 sco_conn_lock(sco_pi(sk)->conn);
422 hci_conn_drop(sco_pi(sk)->conn->hcon);
423 sco_pi(sk)->conn->hcon = NULL;
424 sco_conn_unlock(sco_pi(sk)->conn);
425 } else
426 sco_chan_del(sk, ECONNRESET);
427 break;
428
429 case BT_CONNECT2:
430 case BT_CONNECT:
431 case BT_DISCONN:
432 sco_chan_del(sk, ECONNRESET);
433 break;
434
435 default:
436 sock_set_flag(sk, SOCK_ZAPPED);
437 break;
438 }
439}
440
441/* Must be called on unlocked socket. */
442static void sco_sock_close(struct sock *sk)
443{
444 sco_sock_clear_timer(sk);
445 lock_sock(sk);
446 __sco_sock_close(sk);
447 release_sock(sk);
448 sco_sock_kill(sk);
449}
450
451static void sco_sock_init(struct sock *sk, struct sock *parent)
452{
453 BT_DBG("sk %p", sk);
454
455 if (parent) {
456 sk->sk_type = parent->sk_type;
457 bt_sk(sk)->flags = bt_sk(parent)->flags;
458 security_sk_clone(parent, sk);
459 }
460}
461
462static struct proto sco_proto = {
463 .name = "SCO",
464 .owner = THIS_MODULE,
465 .obj_size = sizeof(struct sco_pinfo)
466};
467
468static struct sock *sco_sock_alloc(struct net *net, struct socket *sock,
469 int proto, gfp_t prio, int kern)
470{
471 struct sock *sk;
472
473 sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto, kern);
474 if (!sk)
475 return NULL;
476
477 sock_init_data(sock, sk);
478 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
479
480 sk->sk_destruct = sco_sock_destruct;
481 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
482
483 sock_reset_flag(sk, SOCK_ZAPPED);
484
485 sk->sk_protocol = proto;
486 sk->sk_state = BT_OPEN;
487
488 sco_pi(sk)->setting = BT_VOICE_CVSD_16BIT;
489
490 timer_setup(&sk->sk_timer, sco_sock_timeout, 0);
491
492 bt_sock_link(&sco_sk_list, sk);
493 return sk;
494}
495
496static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
497 int kern)
498{
499 struct sock *sk;
500
501 BT_DBG("sock %p", sock);
502
503 sock->state = SS_UNCONNECTED;
504
505 if (sock->type != SOCK_SEQPACKET)
506 return -ESOCKTNOSUPPORT;
507
508 sock->ops = &sco_sock_ops;
509
510 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
511 if (!sk)
512 return -ENOMEM;
513
514 sco_sock_init(sk, NULL);
515 return 0;
516}
517
518static int sco_sock_bind(struct socket *sock, struct sockaddr *addr,
519 int addr_len)
520{
521 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
522 struct sock *sk = sock->sk;
523 int err = 0;
524
525 BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
526
527 if (!addr || addr_len < sizeof(struct sockaddr_sco) ||
528 addr->sa_family != AF_BLUETOOTH)
529 return -EINVAL;
530
531 lock_sock(sk);
532
533 if (sk->sk_state != BT_OPEN) {
534 err = -EBADFD;
535 goto done;
536 }
537
538 if (sk->sk_type != SOCK_SEQPACKET) {
539 err = -EINVAL;
540 goto done;
541 }
542
543 bacpy(&sco_pi(sk)->src, &sa->sco_bdaddr);
544
545 sk->sk_state = BT_BOUND;
546
547done:
548 release_sock(sk);
549 return err;
550}
551
552static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
553{
554 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
555 struct sock *sk = sock->sk;
556 int err;
557
558 BT_DBG("sk %p", sk);
559
560 if (alen < sizeof(struct sockaddr_sco) ||
561 addr->sa_family != AF_BLUETOOTH)
562 return -EINVAL;
563
564 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
565 return -EBADFD;
566
567 if (sk->sk_type != SOCK_SEQPACKET)
568 return -EINVAL;
569
570 lock_sock(sk);
571
572 /* Set destination address and psm */
573 bacpy(&sco_pi(sk)->dst, &sa->sco_bdaddr);
574
575 err = sco_connect(sk);
576 if (err)
577 goto done;
578
579 err = bt_sock_wait_state(sk, BT_CONNECTED,
580 sock_sndtimeo(sk, flags & O_NONBLOCK));
581
582done:
583 release_sock(sk);
584 return err;
585}
586
587static int sco_sock_listen(struct socket *sock, int backlog)
588{
589 struct sock *sk = sock->sk;
590 bdaddr_t *src = &sco_pi(sk)->src;
591 int err = 0;
592
593 BT_DBG("sk %p backlog %d", sk, backlog);
594
595 lock_sock(sk);
596
597 if (sk->sk_state != BT_BOUND) {
598 err = -EBADFD;
599 goto done;
600 }
601
602 if (sk->sk_type != SOCK_SEQPACKET) {
603 err = -EINVAL;
604 goto done;
605 }
606
607 write_lock(&sco_sk_list.lock);
608
609 if (__sco_get_sock_listen_by_addr(src)) {
610 err = -EADDRINUSE;
611 goto unlock;
612 }
613
614 sk->sk_max_ack_backlog = backlog;
615 sk->sk_ack_backlog = 0;
616
617 sk->sk_state = BT_LISTEN;
618
619unlock:
620 write_unlock(&sco_sk_list.lock);
621
622done:
623 release_sock(sk);
624 return err;
625}
626
627static int sco_sock_accept(struct socket *sock, struct socket *newsock,
628 int flags, bool kern)
629{
630 DEFINE_WAIT_FUNC(wait, woken_wake_function);
631 struct sock *sk = sock->sk, *ch;
632 long timeo;
633 int err = 0;
634
635 lock_sock(sk);
636
637 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
638
639 BT_DBG("sk %p timeo %ld", sk, timeo);
640
641 /* Wait for an incoming connection. (wake-one). */
642 add_wait_queue_exclusive(sk_sleep(sk), &wait);
643 while (1) {
644 if (sk->sk_state != BT_LISTEN) {
645 err = -EBADFD;
646 break;
647 }
648
649 ch = bt_accept_dequeue(sk, newsock);
650 if (ch)
651 break;
652
653 if (!timeo) {
654 err = -EAGAIN;
655 break;
656 }
657
658 if (signal_pending(current)) {
659 err = sock_intr_errno(timeo);
660 break;
661 }
662
663 release_sock(sk);
664
665 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
666 lock_sock(sk);
667 }
668 remove_wait_queue(sk_sleep(sk), &wait);
669
670 if (err)
671 goto done;
672
673 newsock->state = SS_CONNECTED;
674
675 BT_DBG("new socket %p", ch);
676
677done:
678 release_sock(sk);
679 return err;
680}
681
682static int sco_sock_getname(struct socket *sock, struct sockaddr *addr,
683 int peer)
684{
685 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
686 struct sock *sk = sock->sk;
687
688 BT_DBG("sock %p, sk %p", sock, sk);
689
690 addr->sa_family = AF_BLUETOOTH;
691
692 if (peer)
693 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->dst);
694 else
695 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->src);
696
697 return sizeof(struct sockaddr_sco);
698}
699
700static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
701 size_t len)
702{
703 struct sock *sk = sock->sk;
704 int err;
705
706 BT_DBG("sock %p, sk %p", sock, sk);
707
708 err = sock_error(sk);
709 if (err)
710 return err;
711
712 if (msg->msg_flags & MSG_OOB)
713 return -EOPNOTSUPP;
714
715 lock_sock(sk);
716
717 if (sk->sk_state == BT_CONNECTED)
718 err = sco_send_frame(sk, msg, len);
719 else
720 err = -ENOTCONN;
721
722 release_sock(sk);
723 return err;
724}
725
726static void sco_conn_defer_accept(struct hci_conn *conn, u16 setting)
727{
728 struct hci_dev *hdev = conn->hdev;
729
730 BT_DBG("conn %p", conn);
731
732 conn->state = BT_CONFIG;
733
734 if (!lmp_esco_capable(hdev)) {
735 struct hci_cp_accept_conn_req cp;
736
737 bacpy(&cp.bdaddr, &conn->dst);
738 cp.role = 0x00; /* Ignored */
739
740 hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp);
741 } else {
742 struct hci_cp_accept_sync_conn_req cp;
743
744 bacpy(&cp.bdaddr, &conn->dst);
745 cp.pkt_type = cpu_to_le16(conn->pkt_type);
746
747 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
748 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
749 cp.content_format = cpu_to_le16(setting);
750
751 switch (setting & SCO_AIRMODE_MASK) {
752 case SCO_AIRMODE_TRANSP:
753 if (conn->pkt_type & ESCO_2EV3)
754 cp.max_latency = cpu_to_le16(0x0008);
755 else
756 cp.max_latency = cpu_to_le16(0x000D);
757 cp.retrans_effort = 0x02;
758 break;
759 case SCO_AIRMODE_CVSD:
760 cp.max_latency = cpu_to_le16(0xffff);
761 cp.retrans_effort = 0xff;
762 break;
763 }
764
765 hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ,
766 sizeof(cp), &cp);
767 }
768}
769
770static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
771 size_t len, int flags)
772{
773 struct sock *sk = sock->sk;
774 struct sco_pinfo *pi = sco_pi(sk);
775
776 lock_sock(sk);
777
778 if (sk->sk_state == BT_CONNECT2 &&
779 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
780 sco_conn_defer_accept(pi->conn->hcon, pi->setting);
781 sk->sk_state = BT_CONFIG;
782
783 release_sock(sk);
784 return 0;
785 }
786
787 release_sock(sk);
788
789 return bt_sock_recvmsg(sock, msg, len, flags);
790}
791
792static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
793 char __user *optval, unsigned int optlen)
794{
795 struct sock *sk = sock->sk;
796 int len, err = 0;
797 struct bt_voice voice;
798 u32 opt;
799
800 BT_DBG("sk %p", sk);
801
802 lock_sock(sk);
803
804 switch (optname) {
805
806 case BT_DEFER_SETUP:
807 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
808 err = -EINVAL;
809 break;
810 }
811
812 if (get_user(opt, (u32 __user *) optval)) {
813 err = -EFAULT;
814 break;
815 }
816
817 if (opt)
818 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
819 else
820 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
821 break;
822
823 case BT_VOICE:
824 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
825 sk->sk_state != BT_CONNECT2) {
826 err = -EINVAL;
827 break;
828 }
829
830 voice.setting = sco_pi(sk)->setting;
831
832 len = min_t(unsigned int, sizeof(voice), optlen);
833 if (copy_from_user((char *)&voice, optval, len)) {
834 err = -EFAULT;
835 break;
836 }
837
838 /* Explicitly check for these values */
839 if (voice.setting != BT_VOICE_TRANSPARENT &&
840 voice.setting != BT_VOICE_CVSD_16BIT) {
841 err = -EINVAL;
842 break;
843 }
844
845 sco_pi(sk)->setting = voice.setting;
846 break;
847
848 default:
849 err = -ENOPROTOOPT;
850 break;
851 }
852
853 release_sock(sk);
854 return err;
855}
856
857static int sco_sock_getsockopt_old(struct socket *sock, int optname,
858 char __user *optval, int __user *optlen)
859{
860 struct sock *sk = sock->sk;
861 struct sco_options opts;
862 struct sco_conninfo cinfo;
863 int len, err = 0;
864
865 BT_DBG("sk %p", sk);
866
867 if (get_user(len, optlen))
868 return -EFAULT;
869
870 lock_sock(sk);
871
872 switch (optname) {
873 case SCO_OPTIONS:
874 if (sk->sk_state != BT_CONNECTED &&
875 !(sk->sk_state == BT_CONNECT2 &&
876 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
877 err = -ENOTCONN;
878 break;
879 }
880
881 opts.mtu = sco_pi(sk)->conn->mtu;
882
883 BT_DBG("mtu %d", opts.mtu);
884
885 len = min_t(unsigned int, len, sizeof(opts));
886 if (copy_to_user(optval, (char *)&opts, len))
887 err = -EFAULT;
888
889 break;
890
891 case SCO_CONNINFO:
892 if (sk->sk_state != BT_CONNECTED &&
893 !(sk->sk_state == BT_CONNECT2 &&
894 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
895 err = -ENOTCONN;
896 break;
897 }
898
899 memset(&cinfo, 0, sizeof(cinfo));
900 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
901 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
902
903 len = min_t(unsigned int, len, sizeof(cinfo));
904 if (copy_to_user(optval, (char *)&cinfo, len))
905 err = -EFAULT;
906
907 break;
908
909 default:
910 err = -ENOPROTOOPT;
911 break;
912 }
913
914 release_sock(sk);
915 return err;
916}
917
918static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
919 char __user *optval, int __user *optlen)
920{
921 struct sock *sk = sock->sk;
922 int len, err = 0;
923 struct bt_voice voice;
924
925 BT_DBG("sk %p", sk);
926
927 if (level == SOL_SCO)
928 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
929
930 if (get_user(len, optlen))
931 return -EFAULT;
932
933 lock_sock(sk);
934
935 switch (optname) {
936
937 case BT_DEFER_SETUP:
938 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
939 err = -EINVAL;
940 break;
941 }
942
943 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
944 (u32 __user *)optval))
945 err = -EFAULT;
946
947 break;
948
949 case BT_VOICE:
950 voice.setting = sco_pi(sk)->setting;
951
952 len = min_t(unsigned int, len, sizeof(voice));
953 if (copy_to_user(optval, (char *)&voice, len))
954 err = -EFAULT;
955
956 break;
957
958 default:
959 err = -ENOPROTOOPT;
960 break;
961 }
962
963 release_sock(sk);
964 return err;
965}
966
967static int sco_sock_shutdown(struct socket *sock, int how)
968{
969 struct sock *sk = sock->sk;
970 int err = 0;
971
972 BT_DBG("sock %p, sk %p", sock, sk);
973
974 if (!sk)
975 return 0;
976
977 sock_hold(sk);
978 lock_sock(sk);
979
980 if (!sk->sk_shutdown) {
981 sk->sk_shutdown = SHUTDOWN_MASK;
982 sco_sock_clear_timer(sk);
983 __sco_sock_close(sk);
984
985 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
986 !(current->flags & PF_EXITING))
987 err = bt_sock_wait_state(sk, BT_CLOSED,
988 sk->sk_lingertime);
989 }
990
991 release_sock(sk);
992 sock_put(sk);
993
994 return err;
995}
996
997static int sco_sock_release(struct socket *sock)
998{
999 struct sock *sk = sock->sk;
1000 int err = 0;
1001
1002 BT_DBG("sock %p, sk %p", sock, sk);
1003
1004 if (!sk)
1005 return 0;
1006
1007 sco_sock_close(sk);
1008
1009 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1010 !(current->flags & PF_EXITING)) {
1011 lock_sock(sk);
1012 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1013 release_sock(sk);
1014 }
1015
1016 sock_orphan(sk);
1017 sco_sock_kill(sk);
1018 return err;
1019}
1020
1021static void sco_conn_ready(struct sco_conn *conn)
1022{
1023 struct sock *parent;
1024 struct sock *sk = conn->sk;
1025
1026 BT_DBG("conn %p", conn);
1027
1028 if (sk) {
1029 sco_sock_clear_timer(sk);
1030 bh_lock_sock(sk);
1031 sk->sk_state = BT_CONNECTED;
1032 sk->sk_state_change(sk);
1033 bh_unlock_sock(sk);
1034 } else {
1035 sco_conn_lock(conn);
1036
1037 if (!conn->hcon) {
1038 sco_conn_unlock(conn);
1039 return;
1040 }
1041
1042 parent = sco_get_sock_listen(&conn->hcon->src);
1043 if (!parent) {
1044 sco_conn_unlock(conn);
1045 return;
1046 }
1047
1048 bh_lock_sock(parent);
1049
1050 sk = sco_sock_alloc(sock_net(parent), NULL,
1051 BTPROTO_SCO, GFP_ATOMIC, 0);
1052 if (!sk) {
1053 bh_unlock_sock(parent);
1054 sco_conn_unlock(conn);
1055 return;
1056 }
1057
1058 sco_sock_init(sk, parent);
1059
1060 bacpy(&sco_pi(sk)->src, &conn->hcon->src);
1061 bacpy(&sco_pi(sk)->dst, &conn->hcon->dst);
1062
1063 hci_conn_hold(conn->hcon);
1064 __sco_chan_add(conn, sk, parent);
1065
1066 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1067 sk->sk_state = BT_CONNECT2;
1068 else
1069 sk->sk_state = BT_CONNECTED;
1070
1071 /* Wake up parent */
1072 parent->sk_data_ready(parent);
1073
1074 bh_unlock_sock(parent);
1075
1076 sco_conn_unlock(conn);
1077 }
1078}
1079
1080/* ----- SCO interface with lower layer (HCI) ----- */
1081int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1082{
1083 struct sock *sk;
1084 int lm = 0;
1085
1086 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1087
1088 /* Find listening sockets */
1089 read_lock(&sco_sk_list.lock);
1090 sk_for_each(sk, &sco_sk_list.head) {
1091 if (sk->sk_state != BT_LISTEN)
1092 continue;
1093
1094 if (!bacmp(&sco_pi(sk)->src, &hdev->bdaddr) ||
1095 !bacmp(&sco_pi(sk)->src, BDADDR_ANY)) {
1096 lm |= HCI_LM_ACCEPT;
1097
1098 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1099 *flags |= HCI_PROTO_DEFER;
1100 break;
1101 }
1102 }
1103 read_unlock(&sco_sk_list.lock);
1104
1105 return lm;
1106}
1107
1108static void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
1109{
1110 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1111 return;
1112
1113 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1114
1115 if (!status) {
1116 struct sco_conn *conn;
1117
1118 conn = sco_conn_add(hcon);
1119 if (conn)
1120 sco_conn_ready(conn);
1121 } else
1122 sco_conn_del(hcon, bt_to_errno(status));
1123}
1124
1125static void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1126{
1127 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1128 return;
1129
1130 BT_DBG("hcon %p reason %d", hcon, reason);
1131
1132 sco_conn_del(hcon, bt_to_errno(reason));
1133}
1134
1135void sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
1136{
1137 struct sco_conn *conn = hcon->sco_data;
1138
1139 if (!conn)
1140 goto drop;
1141
1142 BT_DBG("conn %p len %d", conn, skb->len);
1143
1144 if (skb->len) {
1145 sco_recv_frame(conn, skb);
1146 return;
1147 }
1148
1149drop:
1150 kfree_skb(skb);
1151}
1152
1153static struct hci_cb sco_cb = {
1154 .name = "SCO",
1155 .connect_cfm = sco_connect_cfm,
1156 .disconn_cfm = sco_disconn_cfm,
1157};
1158
1159static int sco_debugfs_show(struct seq_file *f, void *p)
1160{
1161 struct sock *sk;
1162
1163 read_lock(&sco_sk_list.lock);
1164
1165 sk_for_each(sk, &sco_sk_list.head) {
1166 seq_printf(f, "%pMR %pMR %d\n", &sco_pi(sk)->src,
1167 &sco_pi(sk)->dst, sk->sk_state);
1168 }
1169
1170 read_unlock(&sco_sk_list.lock);
1171
1172 return 0;
1173}
1174
1175static int sco_debugfs_open(struct inode *inode, struct file *file)
1176{
1177 return single_open(file, sco_debugfs_show, inode->i_private);
1178}
1179
1180static const struct file_operations sco_debugfs_fops = {
1181 .open = sco_debugfs_open,
1182 .read = seq_read,
1183 .llseek = seq_lseek,
1184 .release = single_release,
1185};
1186
1187static struct dentry *sco_debugfs;
1188
1189static const struct proto_ops sco_sock_ops = {
1190 .family = PF_BLUETOOTH,
1191 .owner = THIS_MODULE,
1192 .release = sco_sock_release,
1193 .bind = sco_sock_bind,
1194 .connect = sco_sock_connect,
1195 .listen = sco_sock_listen,
1196 .accept = sco_sock_accept,
1197 .getname = sco_sock_getname,
1198 .sendmsg = sco_sock_sendmsg,
1199 .recvmsg = sco_sock_recvmsg,
1200 .poll = bt_sock_poll,
1201 .ioctl = bt_sock_ioctl,
1202 .mmap = sock_no_mmap,
1203 .socketpair = sock_no_socketpair,
1204 .shutdown = sco_sock_shutdown,
1205 .setsockopt = sco_sock_setsockopt,
1206 .getsockopt = sco_sock_getsockopt
1207};
1208
1209static const struct net_proto_family sco_sock_family_ops = {
1210 .family = PF_BLUETOOTH,
1211 .owner = THIS_MODULE,
1212 .create = sco_sock_create,
1213};
1214
1215int __init sco_init(void)
1216{
1217 int err;
1218
1219 BUILD_BUG_ON(sizeof(struct sockaddr_sco) > sizeof(struct sockaddr));
1220
1221 err = proto_register(&sco_proto, 0);
1222 if (err < 0)
1223 return err;
1224
1225 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1226 if (err < 0) {
1227 BT_ERR("SCO socket registration failed");
1228 goto error;
1229 }
1230
1231 err = bt_procfs_init(&init_net, "sco", &sco_sk_list, NULL);
1232 if (err < 0) {
1233 BT_ERR("Failed to create SCO proc file");
1234 bt_sock_unregister(BTPROTO_SCO);
1235 goto error;
1236 }
1237
1238 BT_INFO("SCO socket layer initialized");
1239
1240 hci_register_cb(&sco_cb);
1241
1242 if (IS_ERR_OR_NULL(bt_debugfs))
1243 return 0;
1244
1245 sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs,
1246 NULL, &sco_debugfs_fops);
1247
1248 return 0;
1249
1250error:
1251 proto_unregister(&sco_proto);
1252 return err;
1253}
1254
1255void sco_exit(void)
1256{
1257 bt_procfs_cleanup(&init_net, "sco");
1258
1259 debugfs_remove(sco_debugfs);
1260
1261 hci_unregister_cb(&sco_cb);
1262
1263 bt_sock_unregister(BTPROTO_SCO);
1264
1265 proto_unregister(&sco_proto);
1266}
1267
1268module_param(disable_esco, bool, 0644);
1269MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");