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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 __u8 cmsg_mask;
70 struct sco_conn *conn;
71};
72
73/* ---- SCO timers ---- */
74#define SCO_CONN_TIMEOUT (HZ * 40)
75#define SCO_DISCONN_TIMEOUT (HZ * 2)
76
77static void sco_sock_timeout(struct timer_list *t)
78{
79 struct sock *sk = from_timer(sk, t, sk_timer);
80
81 BT_DBG("sock %p state %d", sk, sk->sk_state);
82
83 bh_lock_sock(sk);
84 sk->sk_err = ETIMEDOUT;
85 sk->sk_state_change(sk);
86 bh_unlock_sock(sk);
87
88 sco_sock_kill(sk);
89 sock_put(sk);
90}
91
92static void sco_sock_set_timer(struct sock *sk, long timeout)
93{
94 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
95 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
96}
97
98static void sco_sock_clear_timer(struct sock *sk)
99{
100 BT_DBG("sock %p state %d", sk, sk->sk_state);
101 sk_stop_timer(sk, &sk->sk_timer);
102}
103
104/* ---- SCO connections ---- */
105static struct sco_conn *sco_conn_add(struct hci_conn *hcon)
106{
107 struct hci_dev *hdev = hcon->hdev;
108 struct sco_conn *conn = hcon->sco_data;
109
110 if (conn)
111 return conn;
112
113 conn = kzalloc(sizeof(struct sco_conn), GFP_KERNEL);
114 if (!conn)
115 return NULL;
116
117 spin_lock_init(&conn->lock);
118
119 hcon->sco_data = conn;
120 conn->hcon = hcon;
121
122 if (hdev->sco_mtu > 0)
123 conn->mtu = hdev->sco_mtu;
124 else
125 conn->mtu = 60;
126
127 BT_DBG("hcon %p conn %p", hcon, conn);
128
129 return conn;
130}
131
132/* Delete channel.
133 * Must be called on the locked socket. */
134static void sco_chan_del(struct sock *sk, int err)
135{
136 struct sco_conn *conn;
137
138 conn = sco_pi(sk)->conn;
139
140 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
141
142 if (conn) {
143 sco_conn_lock(conn);
144 conn->sk = NULL;
145 sco_pi(sk)->conn = NULL;
146 sco_conn_unlock(conn);
147
148 if (conn->hcon)
149 hci_conn_drop(conn->hcon);
150 }
151
152 sk->sk_state = BT_CLOSED;
153 sk->sk_err = err;
154 sk->sk_state_change(sk);
155
156 sock_set_flag(sk, SOCK_ZAPPED);
157}
158
159static void sco_conn_del(struct hci_conn *hcon, int err)
160{
161 struct sco_conn *conn = hcon->sco_data;
162 struct sock *sk;
163
164 if (!conn)
165 return;
166
167 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
168
169 /* Kill socket */
170 sco_conn_lock(conn);
171 sk = conn->sk;
172 sco_conn_unlock(conn);
173
174 if (sk) {
175 sock_hold(sk);
176 bh_lock_sock(sk);
177 sco_sock_clear_timer(sk);
178 sco_chan_del(sk, err);
179 bh_unlock_sock(sk);
180 sco_sock_kill(sk);
181 sock_put(sk);
182 }
183
184 hcon->sco_data = NULL;
185 kfree(conn);
186}
187
188static void __sco_chan_add(struct sco_conn *conn, struct sock *sk,
189 struct sock *parent)
190{
191 BT_DBG("conn %p", conn);
192
193 sco_pi(sk)->conn = conn;
194 conn->sk = sk;
195
196 if (parent)
197 bt_accept_enqueue(parent, sk, true);
198}
199
200static int sco_chan_add(struct sco_conn *conn, struct sock *sk,
201 struct sock *parent)
202{
203 int err = 0;
204
205 sco_conn_lock(conn);
206 if (conn->sk)
207 err = -EBUSY;
208 else
209 __sco_chan_add(conn, sk, parent);
210
211 sco_conn_unlock(conn);
212 return err;
213}
214
215static int sco_connect(struct sock *sk)
216{
217 struct sco_conn *conn;
218 struct hci_conn *hcon;
219 struct hci_dev *hdev;
220 int err, type;
221
222 BT_DBG("%pMR -> %pMR", &sco_pi(sk)->src, &sco_pi(sk)->dst);
223
224 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src, BDADDR_BREDR);
225 if (!hdev)
226 return -EHOSTUNREACH;
227
228 hci_dev_lock(hdev);
229
230 if (lmp_esco_capable(hdev) && !disable_esco)
231 type = ESCO_LINK;
232 else
233 type = SCO_LINK;
234
235 if (sco_pi(sk)->setting == BT_VOICE_TRANSPARENT &&
236 (!lmp_transp_capable(hdev) || !lmp_esco_capable(hdev))) {
237 err = -EOPNOTSUPP;
238 goto done;
239 }
240
241 hcon = hci_connect_sco(hdev, type, &sco_pi(sk)->dst,
242 sco_pi(sk)->setting);
243 if (IS_ERR(hcon)) {
244 err = PTR_ERR(hcon);
245 goto done;
246 }
247
248 conn = sco_conn_add(hcon);
249 if (!conn) {
250 hci_conn_drop(hcon);
251 err = -ENOMEM;
252 goto done;
253 }
254
255 /* Update source addr of the socket */
256 bacpy(&sco_pi(sk)->src, &hcon->src);
257
258 err = sco_chan_add(conn, sk, NULL);
259 if (err)
260 goto done;
261
262 if (hcon->state == BT_CONNECTED) {
263 sco_sock_clear_timer(sk);
264 sk->sk_state = BT_CONNECTED;
265 } else {
266 sk->sk_state = BT_CONNECT;
267 sco_sock_set_timer(sk, sk->sk_sndtimeo);
268 }
269
270done:
271 hci_dev_unlock(hdev);
272 hci_dev_put(hdev);
273 return err;
274}
275
276static int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
277{
278 struct sco_conn *conn = sco_pi(sk)->conn;
279 struct sk_buff *skb;
280 int err;
281
282 /* Check outgoing MTU */
283 if (len > conn->mtu)
284 return -EINVAL;
285
286 BT_DBG("sk %p len %d", sk, len);
287
288 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
289 if (!skb)
290 return err;
291
292 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
293 kfree_skb(skb);
294 return -EFAULT;
295 }
296
297 hci_send_sco(conn->hcon, skb);
298
299 return len;
300}
301
302static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
303{
304 struct sock *sk;
305
306 sco_conn_lock(conn);
307 sk = conn->sk;
308 sco_conn_unlock(conn);
309
310 if (!sk)
311 goto drop;
312
313 BT_DBG("sk %p len %d", sk, skb->len);
314
315 if (sk->sk_state != BT_CONNECTED)
316 goto drop;
317
318 if (!sock_queue_rcv_skb(sk, skb))
319 return;
320
321drop:
322 kfree_skb(skb);
323}
324
325/* -------- Socket interface ---------- */
326static struct sock *__sco_get_sock_listen_by_addr(bdaddr_t *ba)
327{
328 struct sock *sk;
329
330 sk_for_each(sk, &sco_sk_list.head) {
331 if (sk->sk_state != BT_LISTEN)
332 continue;
333
334 if (!bacmp(&sco_pi(sk)->src, ba))
335 return sk;
336 }
337
338 return NULL;
339}
340
341/* Find socket listening on source bdaddr.
342 * Returns closest match.
343 */
344static struct sock *sco_get_sock_listen(bdaddr_t *src)
345{
346 struct sock *sk = NULL, *sk1 = NULL;
347
348 read_lock(&sco_sk_list.lock);
349
350 sk_for_each(sk, &sco_sk_list.head) {
351 if (sk->sk_state != BT_LISTEN)
352 continue;
353
354 /* Exact match. */
355 if (!bacmp(&sco_pi(sk)->src, src))
356 break;
357
358 /* Closest match */
359 if (!bacmp(&sco_pi(sk)->src, BDADDR_ANY))
360 sk1 = sk;
361 }
362
363 read_unlock(&sco_sk_list.lock);
364
365 return sk ? sk : sk1;
366}
367
368static void sco_sock_destruct(struct sock *sk)
369{
370 BT_DBG("sk %p", sk);
371
372 skb_queue_purge(&sk->sk_receive_queue);
373 skb_queue_purge(&sk->sk_write_queue);
374}
375
376static void sco_sock_cleanup_listen(struct sock *parent)
377{
378 struct sock *sk;
379
380 BT_DBG("parent %p", parent);
381
382 /* Close not yet accepted channels */
383 while ((sk = bt_accept_dequeue(parent, NULL))) {
384 sco_sock_close(sk);
385 sco_sock_kill(sk);
386 }
387
388 parent->sk_state = BT_CLOSED;
389 sock_set_flag(parent, SOCK_ZAPPED);
390}
391
392/* Kill socket (only if zapped and orphan)
393 * Must be called on unlocked socket.
394 */
395static void sco_sock_kill(struct sock *sk)
396{
397 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||
398 sock_flag(sk, SOCK_DEAD))
399 return;
400
401 BT_DBG("sk %p state %d", sk, sk->sk_state);
402
403 /* Kill poor orphan */
404 bt_sock_unlink(&sco_sk_list, sk);
405 sock_set_flag(sk, SOCK_DEAD);
406 sock_put(sk);
407}
408
409static void __sco_sock_close(struct sock *sk)
410{
411 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
412
413 switch (sk->sk_state) {
414 case BT_LISTEN:
415 sco_sock_cleanup_listen(sk);
416 break;
417
418 case BT_CONNECTED:
419 case BT_CONFIG:
420 if (sco_pi(sk)->conn->hcon) {
421 sk->sk_state = BT_DISCONN;
422 sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
423 sco_conn_lock(sco_pi(sk)->conn);
424 hci_conn_drop(sco_pi(sk)->conn->hcon);
425 sco_pi(sk)->conn->hcon = NULL;
426 sco_conn_unlock(sco_pi(sk)->conn);
427 } else
428 sco_chan_del(sk, ECONNRESET);
429 break;
430
431 case BT_CONNECT2:
432 case BT_CONNECT:
433 case BT_DISCONN:
434 sco_chan_del(sk, ECONNRESET);
435 break;
436
437 default:
438 sock_set_flag(sk, SOCK_ZAPPED);
439 break;
440 }
441}
442
443/* Must be called on unlocked socket. */
444static void sco_sock_close(struct sock *sk)
445{
446 sco_sock_clear_timer(sk);
447 lock_sock(sk);
448 __sco_sock_close(sk);
449 release_sock(sk);
450 sco_sock_kill(sk);
451}
452
453static void sco_skb_put_cmsg(struct sk_buff *skb, struct msghdr *msg,
454 struct sock *sk)
455{
456 if (sco_pi(sk)->cmsg_mask & SCO_CMSG_PKT_STATUS)
457 put_cmsg(msg, SOL_BLUETOOTH, BT_SCM_PKT_STATUS,
458 sizeof(bt_cb(skb)->sco.pkt_status),
459 &bt_cb(skb)->sco.pkt_status);
460}
461
462static void sco_sock_init(struct sock *sk, struct sock *parent)
463{
464 BT_DBG("sk %p", sk);
465
466 if (parent) {
467 sk->sk_type = parent->sk_type;
468 bt_sk(sk)->flags = bt_sk(parent)->flags;
469 security_sk_clone(parent, sk);
470 } else {
471 bt_sk(sk)->skb_put_cmsg = sco_skb_put_cmsg;
472 }
473}
474
475static struct proto sco_proto = {
476 .name = "SCO",
477 .owner = THIS_MODULE,
478 .obj_size = sizeof(struct sco_pinfo)
479};
480
481static struct sock *sco_sock_alloc(struct net *net, struct socket *sock,
482 int proto, gfp_t prio, int kern)
483{
484 struct sock *sk;
485
486 sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto, kern);
487 if (!sk)
488 return NULL;
489
490 sock_init_data(sock, sk);
491 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
492
493 sk->sk_destruct = sco_sock_destruct;
494 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
495
496 sock_reset_flag(sk, SOCK_ZAPPED);
497
498 sk->sk_protocol = proto;
499 sk->sk_state = BT_OPEN;
500
501 sco_pi(sk)->setting = BT_VOICE_CVSD_16BIT;
502
503 timer_setup(&sk->sk_timer, sco_sock_timeout, 0);
504
505 bt_sock_link(&sco_sk_list, sk);
506 return sk;
507}
508
509static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
510 int kern)
511{
512 struct sock *sk;
513
514 BT_DBG("sock %p", sock);
515
516 sock->state = SS_UNCONNECTED;
517
518 if (sock->type != SOCK_SEQPACKET)
519 return -ESOCKTNOSUPPORT;
520
521 sock->ops = &sco_sock_ops;
522
523 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
524 if (!sk)
525 return -ENOMEM;
526
527 sco_sock_init(sk, NULL);
528 return 0;
529}
530
531static int sco_sock_bind(struct socket *sock, struct sockaddr *addr,
532 int addr_len)
533{
534 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
535 struct sock *sk = sock->sk;
536 int err = 0;
537
538 if (!addr || addr_len < sizeof(struct sockaddr_sco) ||
539 addr->sa_family != AF_BLUETOOTH)
540 return -EINVAL;
541
542 BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
543
544 lock_sock(sk);
545
546 if (sk->sk_state != BT_OPEN) {
547 err = -EBADFD;
548 goto done;
549 }
550
551 if (sk->sk_type != SOCK_SEQPACKET) {
552 err = -EINVAL;
553 goto done;
554 }
555
556 bacpy(&sco_pi(sk)->src, &sa->sco_bdaddr);
557
558 sk->sk_state = BT_BOUND;
559
560done:
561 release_sock(sk);
562 return err;
563}
564
565static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
566{
567 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
568 struct sock *sk = sock->sk;
569 int err;
570
571 BT_DBG("sk %p", sk);
572
573 if (alen < sizeof(struct sockaddr_sco) ||
574 addr->sa_family != AF_BLUETOOTH)
575 return -EINVAL;
576
577 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
578 return -EBADFD;
579
580 if (sk->sk_type != SOCK_SEQPACKET)
581 return -EINVAL;
582
583 lock_sock(sk);
584
585 /* Set destination address and psm */
586 bacpy(&sco_pi(sk)->dst, &sa->sco_bdaddr);
587
588 err = sco_connect(sk);
589 if (err)
590 goto done;
591
592 err = bt_sock_wait_state(sk, BT_CONNECTED,
593 sock_sndtimeo(sk, flags & O_NONBLOCK));
594
595done:
596 release_sock(sk);
597 return err;
598}
599
600static int sco_sock_listen(struct socket *sock, int backlog)
601{
602 struct sock *sk = sock->sk;
603 bdaddr_t *src = &sco_pi(sk)->src;
604 int err = 0;
605
606 BT_DBG("sk %p backlog %d", sk, backlog);
607
608 lock_sock(sk);
609
610 if (sk->sk_state != BT_BOUND) {
611 err = -EBADFD;
612 goto done;
613 }
614
615 if (sk->sk_type != SOCK_SEQPACKET) {
616 err = -EINVAL;
617 goto done;
618 }
619
620 write_lock(&sco_sk_list.lock);
621
622 if (__sco_get_sock_listen_by_addr(src)) {
623 err = -EADDRINUSE;
624 goto unlock;
625 }
626
627 sk->sk_max_ack_backlog = backlog;
628 sk->sk_ack_backlog = 0;
629
630 sk->sk_state = BT_LISTEN;
631
632unlock:
633 write_unlock(&sco_sk_list.lock);
634
635done:
636 release_sock(sk);
637 return err;
638}
639
640static int sco_sock_accept(struct socket *sock, struct socket *newsock,
641 int flags, bool kern)
642{
643 DEFINE_WAIT_FUNC(wait, woken_wake_function);
644 struct sock *sk = sock->sk, *ch;
645 long timeo;
646 int err = 0;
647
648 lock_sock(sk);
649
650 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
651
652 BT_DBG("sk %p timeo %ld", sk, timeo);
653
654 /* Wait for an incoming connection. (wake-one). */
655 add_wait_queue_exclusive(sk_sleep(sk), &wait);
656 while (1) {
657 if (sk->sk_state != BT_LISTEN) {
658 err = -EBADFD;
659 break;
660 }
661
662 ch = bt_accept_dequeue(sk, newsock);
663 if (ch)
664 break;
665
666 if (!timeo) {
667 err = -EAGAIN;
668 break;
669 }
670
671 if (signal_pending(current)) {
672 err = sock_intr_errno(timeo);
673 break;
674 }
675
676 release_sock(sk);
677
678 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
679 lock_sock(sk);
680 }
681 remove_wait_queue(sk_sleep(sk), &wait);
682
683 if (err)
684 goto done;
685
686 newsock->state = SS_CONNECTED;
687
688 BT_DBG("new socket %p", ch);
689
690done:
691 release_sock(sk);
692 return err;
693}
694
695static int sco_sock_getname(struct socket *sock, struct sockaddr *addr,
696 int peer)
697{
698 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
699 struct sock *sk = sock->sk;
700
701 BT_DBG("sock %p, sk %p", sock, sk);
702
703 addr->sa_family = AF_BLUETOOTH;
704
705 if (peer)
706 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->dst);
707 else
708 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->src);
709
710 return sizeof(struct sockaddr_sco);
711}
712
713static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
714 size_t len)
715{
716 struct sock *sk = sock->sk;
717 int err;
718
719 BT_DBG("sock %p, sk %p", sock, sk);
720
721 err = sock_error(sk);
722 if (err)
723 return err;
724
725 if (msg->msg_flags & MSG_OOB)
726 return -EOPNOTSUPP;
727
728 lock_sock(sk);
729
730 if (sk->sk_state == BT_CONNECTED)
731 err = sco_send_frame(sk, msg, len);
732 else
733 err = -ENOTCONN;
734
735 release_sock(sk);
736 return err;
737}
738
739static void sco_conn_defer_accept(struct hci_conn *conn, u16 setting)
740{
741 struct hci_dev *hdev = conn->hdev;
742
743 BT_DBG("conn %p", conn);
744
745 conn->state = BT_CONFIG;
746
747 if (!lmp_esco_capable(hdev)) {
748 struct hci_cp_accept_conn_req cp;
749
750 bacpy(&cp.bdaddr, &conn->dst);
751 cp.role = 0x00; /* Ignored */
752
753 hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp);
754 } else {
755 struct hci_cp_accept_sync_conn_req cp;
756
757 bacpy(&cp.bdaddr, &conn->dst);
758 cp.pkt_type = cpu_to_le16(conn->pkt_type);
759
760 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
761 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
762 cp.content_format = cpu_to_le16(setting);
763
764 switch (setting & SCO_AIRMODE_MASK) {
765 case SCO_AIRMODE_TRANSP:
766 if (conn->pkt_type & ESCO_2EV3)
767 cp.max_latency = cpu_to_le16(0x0008);
768 else
769 cp.max_latency = cpu_to_le16(0x000D);
770 cp.retrans_effort = 0x02;
771 break;
772 case SCO_AIRMODE_CVSD:
773 cp.max_latency = cpu_to_le16(0xffff);
774 cp.retrans_effort = 0xff;
775 break;
776 }
777
778 hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ,
779 sizeof(cp), &cp);
780 }
781}
782
783static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
784 size_t len, int flags)
785{
786 struct sock *sk = sock->sk;
787 struct sco_pinfo *pi = sco_pi(sk);
788
789 lock_sock(sk);
790
791 if (sk->sk_state == BT_CONNECT2 &&
792 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
793 sco_conn_defer_accept(pi->conn->hcon, pi->setting);
794 sk->sk_state = BT_CONFIG;
795
796 release_sock(sk);
797 return 0;
798 }
799
800 release_sock(sk);
801
802 return bt_sock_recvmsg(sock, msg, len, flags);
803}
804
805static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
806 sockptr_t optval, unsigned int optlen)
807{
808 struct sock *sk = sock->sk;
809 int len, err = 0;
810 struct bt_voice voice;
811 u32 opt;
812
813 BT_DBG("sk %p", sk);
814
815 lock_sock(sk);
816
817 switch (optname) {
818
819 case BT_DEFER_SETUP:
820 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
821 err = -EINVAL;
822 break;
823 }
824
825 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
826 err = -EFAULT;
827 break;
828 }
829
830 if (opt)
831 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
832 else
833 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
834 break;
835
836 case BT_VOICE:
837 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
838 sk->sk_state != BT_CONNECT2) {
839 err = -EINVAL;
840 break;
841 }
842
843 voice.setting = sco_pi(sk)->setting;
844
845 len = min_t(unsigned int, sizeof(voice), optlen);
846 if (copy_from_sockptr(&voice, optval, len)) {
847 err = -EFAULT;
848 break;
849 }
850
851 /* Explicitly check for these values */
852 if (voice.setting != BT_VOICE_TRANSPARENT &&
853 voice.setting != BT_VOICE_CVSD_16BIT) {
854 err = -EINVAL;
855 break;
856 }
857
858 sco_pi(sk)->setting = voice.setting;
859 break;
860
861 case BT_PKT_STATUS:
862 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
863 err = -EFAULT;
864 break;
865 }
866
867 if (opt)
868 sco_pi(sk)->cmsg_mask |= SCO_CMSG_PKT_STATUS;
869 else
870 sco_pi(sk)->cmsg_mask &= SCO_CMSG_PKT_STATUS;
871 break;
872
873 default:
874 err = -ENOPROTOOPT;
875 break;
876 }
877
878 release_sock(sk);
879 return err;
880}
881
882static int sco_sock_getsockopt_old(struct socket *sock, int optname,
883 char __user *optval, int __user *optlen)
884{
885 struct sock *sk = sock->sk;
886 struct sco_options opts;
887 struct sco_conninfo cinfo;
888 int len, err = 0;
889
890 BT_DBG("sk %p", sk);
891
892 if (get_user(len, optlen))
893 return -EFAULT;
894
895 lock_sock(sk);
896
897 switch (optname) {
898 case SCO_OPTIONS:
899 if (sk->sk_state != BT_CONNECTED &&
900 !(sk->sk_state == BT_CONNECT2 &&
901 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
902 err = -ENOTCONN;
903 break;
904 }
905
906 opts.mtu = sco_pi(sk)->conn->mtu;
907
908 BT_DBG("mtu %d", opts.mtu);
909
910 len = min_t(unsigned int, len, sizeof(opts));
911 if (copy_to_user(optval, (char *)&opts, len))
912 err = -EFAULT;
913
914 break;
915
916 case SCO_CONNINFO:
917 if (sk->sk_state != BT_CONNECTED &&
918 !(sk->sk_state == BT_CONNECT2 &&
919 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
920 err = -ENOTCONN;
921 break;
922 }
923
924 memset(&cinfo, 0, sizeof(cinfo));
925 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
926 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
927
928 len = min_t(unsigned int, len, sizeof(cinfo));
929 if (copy_to_user(optval, (char *)&cinfo, len))
930 err = -EFAULT;
931
932 break;
933
934 default:
935 err = -ENOPROTOOPT;
936 break;
937 }
938
939 release_sock(sk);
940 return err;
941}
942
943static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
944 char __user *optval, int __user *optlen)
945{
946 struct sock *sk = sock->sk;
947 int len, err = 0;
948 struct bt_voice voice;
949 u32 phys;
950 int pkt_status;
951
952 BT_DBG("sk %p", sk);
953
954 if (level == SOL_SCO)
955 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
956
957 if (get_user(len, optlen))
958 return -EFAULT;
959
960 lock_sock(sk);
961
962 switch (optname) {
963
964 case BT_DEFER_SETUP:
965 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
966 err = -EINVAL;
967 break;
968 }
969
970 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
971 (u32 __user *)optval))
972 err = -EFAULT;
973
974 break;
975
976 case BT_VOICE:
977 voice.setting = sco_pi(sk)->setting;
978
979 len = min_t(unsigned int, len, sizeof(voice));
980 if (copy_to_user(optval, (char *)&voice, len))
981 err = -EFAULT;
982
983 break;
984
985 case BT_PHY:
986 if (sk->sk_state != BT_CONNECTED) {
987 err = -ENOTCONN;
988 break;
989 }
990
991 phys = hci_conn_get_phy(sco_pi(sk)->conn->hcon);
992
993 if (put_user(phys, (u32 __user *) optval))
994 err = -EFAULT;
995 break;
996
997 case BT_PKT_STATUS:
998 pkt_status = (sco_pi(sk)->cmsg_mask & SCO_CMSG_PKT_STATUS);
999
1000 if (put_user(pkt_status, (int __user *)optval))
1001 err = -EFAULT;
1002 break;
1003
1004 default:
1005 err = -ENOPROTOOPT;
1006 break;
1007 }
1008
1009 release_sock(sk);
1010 return err;
1011}
1012
1013static int sco_sock_shutdown(struct socket *sock, int how)
1014{
1015 struct sock *sk = sock->sk;
1016 int err = 0;
1017
1018 BT_DBG("sock %p, sk %p", sock, sk);
1019
1020 if (!sk)
1021 return 0;
1022
1023 sock_hold(sk);
1024 lock_sock(sk);
1025
1026 if (!sk->sk_shutdown) {
1027 sk->sk_shutdown = SHUTDOWN_MASK;
1028 sco_sock_clear_timer(sk);
1029 __sco_sock_close(sk);
1030
1031 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1032 !(current->flags & PF_EXITING))
1033 err = bt_sock_wait_state(sk, BT_CLOSED,
1034 sk->sk_lingertime);
1035 }
1036
1037 release_sock(sk);
1038 sock_put(sk);
1039
1040 return err;
1041}
1042
1043static int sco_sock_release(struct socket *sock)
1044{
1045 struct sock *sk = sock->sk;
1046 int err = 0;
1047
1048 BT_DBG("sock %p, sk %p", sock, sk);
1049
1050 if (!sk)
1051 return 0;
1052
1053 sco_sock_close(sk);
1054
1055 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1056 !(current->flags & PF_EXITING)) {
1057 lock_sock(sk);
1058 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1059 release_sock(sk);
1060 }
1061
1062 sock_orphan(sk);
1063 sco_sock_kill(sk);
1064 return err;
1065}
1066
1067static void sco_conn_ready(struct sco_conn *conn)
1068{
1069 struct sock *parent;
1070 struct sock *sk = conn->sk;
1071
1072 BT_DBG("conn %p", conn);
1073
1074 if (sk) {
1075 sco_sock_clear_timer(sk);
1076 bh_lock_sock(sk);
1077 sk->sk_state = BT_CONNECTED;
1078 sk->sk_state_change(sk);
1079 bh_unlock_sock(sk);
1080 } else {
1081 sco_conn_lock(conn);
1082
1083 if (!conn->hcon) {
1084 sco_conn_unlock(conn);
1085 return;
1086 }
1087
1088 parent = sco_get_sock_listen(&conn->hcon->src);
1089 if (!parent) {
1090 sco_conn_unlock(conn);
1091 return;
1092 }
1093
1094 bh_lock_sock(parent);
1095
1096 sk = sco_sock_alloc(sock_net(parent), NULL,
1097 BTPROTO_SCO, GFP_ATOMIC, 0);
1098 if (!sk) {
1099 bh_unlock_sock(parent);
1100 sco_conn_unlock(conn);
1101 return;
1102 }
1103
1104 sco_sock_init(sk, parent);
1105
1106 bacpy(&sco_pi(sk)->src, &conn->hcon->src);
1107 bacpy(&sco_pi(sk)->dst, &conn->hcon->dst);
1108
1109 hci_conn_hold(conn->hcon);
1110 __sco_chan_add(conn, sk, parent);
1111
1112 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1113 sk->sk_state = BT_CONNECT2;
1114 else
1115 sk->sk_state = BT_CONNECTED;
1116
1117 /* Wake up parent */
1118 parent->sk_data_ready(parent);
1119
1120 bh_unlock_sock(parent);
1121
1122 sco_conn_unlock(conn);
1123 }
1124}
1125
1126/* ----- SCO interface with lower layer (HCI) ----- */
1127int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1128{
1129 struct sock *sk;
1130 int lm = 0;
1131
1132 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1133
1134 /* Find listening sockets */
1135 read_lock(&sco_sk_list.lock);
1136 sk_for_each(sk, &sco_sk_list.head) {
1137 if (sk->sk_state != BT_LISTEN)
1138 continue;
1139
1140 if (!bacmp(&sco_pi(sk)->src, &hdev->bdaddr) ||
1141 !bacmp(&sco_pi(sk)->src, BDADDR_ANY)) {
1142 lm |= HCI_LM_ACCEPT;
1143
1144 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1145 *flags |= HCI_PROTO_DEFER;
1146 break;
1147 }
1148 }
1149 read_unlock(&sco_sk_list.lock);
1150
1151 return lm;
1152}
1153
1154static void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
1155{
1156 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1157 return;
1158
1159 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1160
1161 if (!status) {
1162 struct sco_conn *conn;
1163
1164 conn = sco_conn_add(hcon);
1165 if (conn)
1166 sco_conn_ready(conn);
1167 } else
1168 sco_conn_del(hcon, bt_to_errno(status));
1169}
1170
1171static void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1172{
1173 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1174 return;
1175
1176 BT_DBG("hcon %p reason %d", hcon, reason);
1177
1178 sco_conn_del(hcon, bt_to_errno(reason));
1179}
1180
1181void sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
1182{
1183 struct sco_conn *conn = hcon->sco_data;
1184
1185 if (!conn)
1186 goto drop;
1187
1188 BT_DBG("conn %p len %d", conn, skb->len);
1189
1190 if (skb->len) {
1191 sco_recv_frame(conn, skb);
1192 return;
1193 }
1194
1195drop:
1196 kfree_skb(skb);
1197}
1198
1199static struct hci_cb sco_cb = {
1200 .name = "SCO",
1201 .connect_cfm = sco_connect_cfm,
1202 .disconn_cfm = sco_disconn_cfm,
1203};
1204
1205static int sco_debugfs_show(struct seq_file *f, void *p)
1206{
1207 struct sock *sk;
1208
1209 read_lock(&sco_sk_list.lock);
1210
1211 sk_for_each(sk, &sco_sk_list.head) {
1212 seq_printf(f, "%pMR %pMR %d\n", &sco_pi(sk)->src,
1213 &sco_pi(sk)->dst, sk->sk_state);
1214 }
1215
1216 read_unlock(&sco_sk_list.lock);
1217
1218 return 0;
1219}
1220
1221DEFINE_SHOW_ATTRIBUTE(sco_debugfs);
1222
1223static struct dentry *sco_debugfs;
1224
1225static const struct proto_ops sco_sock_ops = {
1226 .family = PF_BLUETOOTH,
1227 .owner = THIS_MODULE,
1228 .release = sco_sock_release,
1229 .bind = sco_sock_bind,
1230 .connect = sco_sock_connect,
1231 .listen = sco_sock_listen,
1232 .accept = sco_sock_accept,
1233 .getname = sco_sock_getname,
1234 .sendmsg = sco_sock_sendmsg,
1235 .recvmsg = sco_sock_recvmsg,
1236 .poll = bt_sock_poll,
1237 .ioctl = bt_sock_ioctl,
1238 .gettstamp = sock_gettstamp,
1239 .mmap = sock_no_mmap,
1240 .socketpair = sock_no_socketpair,
1241 .shutdown = sco_sock_shutdown,
1242 .setsockopt = sco_sock_setsockopt,
1243 .getsockopt = sco_sock_getsockopt
1244};
1245
1246static const struct net_proto_family sco_sock_family_ops = {
1247 .family = PF_BLUETOOTH,
1248 .owner = THIS_MODULE,
1249 .create = sco_sock_create,
1250};
1251
1252int __init sco_init(void)
1253{
1254 int err;
1255
1256 BUILD_BUG_ON(sizeof(struct sockaddr_sco) > sizeof(struct sockaddr));
1257
1258 err = proto_register(&sco_proto, 0);
1259 if (err < 0)
1260 return err;
1261
1262 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1263 if (err < 0) {
1264 BT_ERR("SCO socket registration failed");
1265 goto error;
1266 }
1267
1268 err = bt_procfs_init(&init_net, "sco", &sco_sk_list, NULL);
1269 if (err < 0) {
1270 BT_ERR("Failed to create SCO proc file");
1271 bt_sock_unregister(BTPROTO_SCO);
1272 goto error;
1273 }
1274
1275 BT_INFO("SCO socket layer initialized");
1276
1277 hci_register_cb(&sco_cb);
1278
1279 if (IS_ERR_OR_NULL(bt_debugfs))
1280 return 0;
1281
1282 sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs,
1283 NULL, &sco_debugfs_fops);
1284
1285 return 0;
1286
1287error:
1288 proto_unregister(&sco_proto);
1289 return err;
1290}
1291
1292void sco_exit(void)
1293{
1294 bt_procfs_cleanup(&init_net, "sco");
1295
1296 debugfs_remove(sco_debugfs);
1297
1298 hci_unregister_cb(&sco_cb);
1299
1300 bt_sock_unregister(BTPROTO_SCO);
1301
1302 proto_unregister(&sco_proto);
1303}
1304
1305module_param(disable_esco, bool, 0644);
1306MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");