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