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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};
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");
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
29#include <linux/types.h>
30#include <linux/errno.h>
31#include <linux/kernel.h>
32#include <linux/sched.h>
33#include <linux/slab.h>
34#include <linux/poll.h>
35#include <linux/fcntl.h>
36#include <linux/init.h>
37#include <linux/interrupt.h>
38#include <linux/socket.h>
39#include <linux/skbuff.h>
40#include <linux/device.h>
41#include <linux/debugfs.h>
42#include <linux/seq_file.h>
43#include <linux/list.h>
44#include <linux/security.h>
45#include <net/sock.h>
46
47#include <asm/system.h>
48#include <linux/uaccess.h>
49
50#include <net/bluetooth/bluetooth.h>
51#include <net/bluetooth/hci_core.h>
52#include <net/bluetooth/sco.h>
53
54static int disable_esco;
55
56static const struct proto_ops sco_sock_ops;
57
58static struct bt_sock_list sco_sk_list = {
59 .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
60};
61
62static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent);
63static void sco_chan_del(struct sock *sk, int err);
64
65static int sco_conn_del(struct hci_conn *conn, int err);
66
67static void sco_sock_close(struct sock *sk);
68static void sco_sock_kill(struct sock *sk);
69
70/* ---- SCO timers ---- */
71static void sco_sock_timeout(unsigned long arg)
72{
73 struct sock *sk = (struct sock *) arg;
74
75 BT_DBG("sock %p state %d", sk, sk->sk_state);
76
77 bh_lock_sock(sk);
78 sk->sk_err = ETIMEDOUT;
79 sk->sk_state_change(sk);
80 bh_unlock_sock(sk);
81
82 sco_sock_kill(sk);
83 sock_put(sk);
84}
85
86static void sco_sock_set_timer(struct sock *sk, long timeout)
87{
88 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
89 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
90}
91
92static void sco_sock_clear_timer(struct sock *sk)
93{
94 BT_DBG("sock %p state %d", sk, sk->sk_state);
95 sk_stop_timer(sk, &sk->sk_timer);
96}
97
98/* ---- SCO connections ---- */
99static struct sco_conn *sco_conn_add(struct hci_conn *hcon, __u8 status)
100{
101 struct hci_dev *hdev = hcon->hdev;
102 struct sco_conn *conn = hcon->sco_data;
103
104 if (conn || status)
105 return conn;
106
107 conn = kzalloc(sizeof(struct sco_conn), GFP_ATOMIC);
108 if (!conn)
109 return NULL;
110
111 spin_lock_init(&conn->lock);
112
113 hcon->sco_data = conn;
114 conn->hcon = hcon;
115
116 conn->src = &hdev->bdaddr;
117 conn->dst = &hcon->dst;
118
119 if (hdev->sco_mtu > 0)
120 conn->mtu = hdev->sco_mtu;
121 else
122 conn->mtu = 60;
123
124 BT_DBG("hcon %p conn %p", hcon, conn);
125
126 return conn;
127}
128
129static inline struct sock *sco_chan_get(struct sco_conn *conn)
130{
131 struct sock *sk = NULL;
132 sco_conn_lock(conn);
133 sk = conn->sk;
134 sco_conn_unlock(conn);
135 return sk;
136}
137
138static int sco_conn_del(struct hci_conn *hcon, int err)
139{
140 struct sco_conn *conn = hcon->sco_data;
141 struct sock *sk;
142
143 if (!conn)
144 return 0;
145
146 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
147
148 /* Kill socket */
149 sk = sco_chan_get(conn);
150 if (sk) {
151 bh_lock_sock(sk);
152 sco_sock_clear_timer(sk);
153 sco_chan_del(sk, err);
154 bh_unlock_sock(sk);
155 sco_sock_kill(sk);
156 }
157
158 hcon->sco_data = NULL;
159 kfree(conn);
160 return 0;
161}
162
163static inline int sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
164{
165 int err = 0;
166
167 sco_conn_lock(conn);
168 if (conn->sk)
169 err = -EBUSY;
170 else
171 __sco_chan_add(conn, sk, parent);
172
173 sco_conn_unlock(conn);
174 return err;
175}
176
177static int sco_connect(struct sock *sk)
178{
179 bdaddr_t *src = &bt_sk(sk)->src;
180 bdaddr_t *dst = &bt_sk(sk)->dst;
181 struct sco_conn *conn;
182 struct hci_conn *hcon;
183 struct hci_dev *hdev;
184 int err, type;
185
186 BT_DBG("%s -> %s", batostr(src), batostr(dst));
187
188 hdev = hci_get_route(dst, src);
189 if (!hdev)
190 return -EHOSTUNREACH;
191
192 hci_dev_lock_bh(hdev);
193
194 if (lmp_esco_capable(hdev) && !disable_esco)
195 type = ESCO_LINK;
196 else
197 type = SCO_LINK;
198
199 hcon = hci_connect(hdev, type, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
200 if (IS_ERR(hcon)) {
201 err = PTR_ERR(hcon);
202 goto done;
203 }
204
205 conn = sco_conn_add(hcon, 0);
206 if (!conn) {
207 hci_conn_put(hcon);
208 err = -ENOMEM;
209 goto done;
210 }
211
212 /* Update source addr of the socket */
213 bacpy(src, conn->src);
214
215 err = sco_chan_add(conn, sk, NULL);
216 if (err)
217 goto done;
218
219 if (hcon->state == BT_CONNECTED) {
220 sco_sock_clear_timer(sk);
221 sk->sk_state = BT_CONNECTED;
222 } else {
223 sk->sk_state = BT_CONNECT;
224 sco_sock_set_timer(sk, sk->sk_sndtimeo);
225 }
226
227done:
228 hci_dev_unlock_bh(hdev);
229 hci_dev_put(hdev);
230 return err;
231}
232
233static inline int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
234{
235 struct sco_conn *conn = sco_pi(sk)->conn;
236 struct sk_buff *skb;
237 int err, count;
238
239 /* Check outgoing MTU */
240 if (len > conn->mtu)
241 return -EINVAL;
242
243 BT_DBG("sk %p len %d", sk, len);
244
245 count = min_t(unsigned int, conn->mtu, len);
246 skb = bt_skb_send_alloc(sk, count,
247 msg->msg_flags & MSG_DONTWAIT, &err);
248 if (!skb)
249 return err;
250
251 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
252 kfree_skb(skb);
253 return -EFAULT;
254 }
255
256 hci_send_sco(conn->hcon, skb);
257
258 return count;
259}
260
261static inline void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
262{
263 struct sock *sk = sco_chan_get(conn);
264
265 if (!sk)
266 goto drop;
267
268 BT_DBG("sk %p len %d", sk, skb->len);
269
270 if (sk->sk_state != BT_CONNECTED)
271 goto drop;
272
273 if (!sock_queue_rcv_skb(sk, skb))
274 return;
275
276drop:
277 kfree_skb(skb);
278}
279
280/* -------- Socket interface ---------- */
281static struct sock *__sco_get_sock_by_addr(bdaddr_t *ba)
282{
283 struct sock *sk;
284 struct hlist_node *node;
285
286 sk_for_each(sk, node, &sco_sk_list.head)
287 if (!bacmp(&bt_sk(sk)->src, ba))
288 goto found;
289 sk = NULL;
290found:
291 return sk;
292}
293
294/* Find socket listening on source bdaddr.
295 * Returns closest match.
296 */
297static struct sock *sco_get_sock_listen(bdaddr_t *src)
298{
299 struct sock *sk = NULL, *sk1 = NULL;
300 struct hlist_node *node;
301
302 read_lock(&sco_sk_list.lock);
303
304 sk_for_each(sk, node, &sco_sk_list.head) {
305 if (sk->sk_state != BT_LISTEN)
306 continue;
307
308 /* Exact match. */
309 if (!bacmp(&bt_sk(sk)->src, src))
310 break;
311
312 /* Closest match */
313 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
314 sk1 = sk;
315 }
316
317 read_unlock(&sco_sk_list.lock);
318
319 return node ? sk : sk1;
320}
321
322static void sco_sock_destruct(struct sock *sk)
323{
324 BT_DBG("sk %p", sk);
325
326 skb_queue_purge(&sk->sk_receive_queue);
327 skb_queue_purge(&sk->sk_write_queue);
328}
329
330static void sco_sock_cleanup_listen(struct sock *parent)
331{
332 struct sock *sk;
333
334 BT_DBG("parent %p", parent);
335
336 /* Close not yet accepted channels */
337 while ((sk = bt_accept_dequeue(parent, NULL))) {
338 sco_sock_close(sk);
339 sco_sock_kill(sk);
340 }
341
342 parent->sk_state = BT_CLOSED;
343 sock_set_flag(parent, SOCK_ZAPPED);
344}
345
346/* Kill socket (only if zapped and orphan)
347 * Must be called on unlocked socket.
348 */
349static void sco_sock_kill(struct sock *sk)
350{
351 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
352 return;
353
354 BT_DBG("sk %p state %d", sk, sk->sk_state);
355
356 /* Kill poor orphan */
357 bt_sock_unlink(&sco_sk_list, sk);
358 sock_set_flag(sk, SOCK_DEAD);
359 sock_put(sk);
360}
361
362static void __sco_sock_close(struct sock *sk)
363{
364 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
365
366 switch (sk->sk_state) {
367 case BT_LISTEN:
368 sco_sock_cleanup_listen(sk);
369 break;
370
371 case BT_CONNECTED:
372 case BT_CONFIG:
373 if (sco_pi(sk)->conn) {
374 sk->sk_state = BT_DISCONN;
375 sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
376 hci_conn_put(sco_pi(sk)->conn->hcon);
377 sco_pi(sk)->conn->hcon = NULL;
378 } else
379 sco_chan_del(sk, ECONNRESET);
380 break;
381
382 case BT_CONNECT:
383 case BT_DISCONN:
384 sco_chan_del(sk, ECONNRESET);
385 break;
386
387 default:
388 sock_set_flag(sk, SOCK_ZAPPED);
389 break;
390 }
391}
392
393/* Must be called on unlocked socket. */
394static void sco_sock_close(struct sock *sk)
395{
396 sco_sock_clear_timer(sk);
397 lock_sock(sk);
398 __sco_sock_close(sk);
399 release_sock(sk);
400 sco_sock_kill(sk);
401}
402
403static void sco_sock_init(struct sock *sk, struct sock *parent)
404{
405 BT_DBG("sk %p", sk);
406
407 if (parent) {
408 sk->sk_type = parent->sk_type;
409 security_sk_clone(parent, sk);
410 }
411}
412
413static struct proto sco_proto = {
414 .name = "SCO",
415 .owner = THIS_MODULE,
416 .obj_size = sizeof(struct sco_pinfo)
417};
418
419static struct sock *sco_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
420{
421 struct sock *sk;
422
423 sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto);
424 if (!sk)
425 return NULL;
426
427 sock_init_data(sock, sk);
428 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
429
430 sk->sk_destruct = sco_sock_destruct;
431 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
432
433 sock_reset_flag(sk, SOCK_ZAPPED);
434
435 sk->sk_protocol = proto;
436 sk->sk_state = BT_OPEN;
437
438 setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk);
439
440 bt_sock_link(&sco_sk_list, sk);
441 return sk;
442}
443
444static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
445 int kern)
446{
447 struct sock *sk;
448
449 BT_DBG("sock %p", sock);
450
451 sock->state = SS_UNCONNECTED;
452
453 if (sock->type != SOCK_SEQPACKET)
454 return -ESOCKTNOSUPPORT;
455
456 sock->ops = &sco_sock_ops;
457
458 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC);
459 if (!sk)
460 return -ENOMEM;
461
462 sco_sock_init(sk, NULL);
463 return 0;
464}
465
466static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
467{
468 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
469 struct sock *sk = sock->sk;
470 bdaddr_t *src = &sa->sco_bdaddr;
471 int err = 0;
472
473 BT_DBG("sk %p %s", sk, batostr(&sa->sco_bdaddr));
474
475 if (!addr || addr->sa_family != AF_BLUETOOTH)
476 return -EINVAL;
477
478 lock_sock(sk);
479
480 if (sk->sk_state != BT_OPEN) {
481 err = -EBADFD;
482 goto done;
483 }
484
485 write_lock_bh(&sco_sk_list.lock);
486
487 if (bacmp(src, BDADDR_ANY) && __sco_get_sock_by_addr(src)) {
488 err = -EADDRINUSE;
489 } else {
490 /* Save source address */
491 bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
492 sk->sk_state = BT_BOUND;
493 }
494
495 write_unlock_bh(&sco_sk_list.lock);
496
497done:
498 release_sock(sk);
499 return err;
500}
501
502static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
503{
504 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
505 struct sock *sk = sock->sk;
506 int err = 0;
507
508
509 BT_DBG("sk %p", sk);
510
511 if (alen < sizeof(struct sockaddr_sco) ||
512 addr->sa_family != AF_BLUETOOTH)
513 return -EINVAL;
514
515 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
516 return -EBADFD;
517
518 if (sk->sk_type != SOCK_SEQPACKET)
519 return -EINVAL;
520
521 lock_sock(sk);
522
523 /* Set destination address and psm */
524 bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
525
526 err = sco_connect(sk);
527 if (err)
528 goto done;
529
530 err = bt_sock_wait_state(sk, BT_CONNECTED,
531 sock_sndtimeo(sk, flags & O_NONBLOCK));
532
533done:
534 release_sock(sk);
535 return err;
536}
537
538static int sco_sock_listen(struct socket *sock, int backlog)
539{
540 struct sock *sk = sock->sk;
541 int err = 0;
542
543 BT_DBG("sk %p backlog %d", sk, backlog);
544
545 lock_sock(sk);
546
547 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
548 err = -EBADFD;
549 goto done;
550 }
551
552 sk->sk_max_ack_backlog = backlog;
553 sk->sk_ack_backlog = 0;
554 sk->sk_state = BT_LISTEN;
555
556done:
557 release_sock(sk);
558 return err;
559}
560
561static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
562{
563 DECLARE_WAITQUEUE(wait, current);
564 struct sock *sk = sock->sk, *ch;
565 long timeo;
566 int err = 0;
567
568 lock_sock(sk);
569
570 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
571
572 BT_DBG("sk %p timeo %ld", sk, timeo);
573
574 /* Wait for an incoming connection. (wake-one). */
575 add_wait_queue_exclusive(sk_sleep(sk), &wait);
576 while (1) {
577 set_current_state(TASK_INTERRUPTIBLE);
578
579 if (sk->sk_state != BT_LISTEN) {
580 err = -EBADFD;
581 break;
582 }
583
584 ch = bt_accept_dequeue(sk, newsock);
585 if (ch)
586 break;
587
588 if (!timeo) {
589 err = -EAGAIN;
590 break;
591 }
592
593 if (signal_pending(current)) {
594 err = sock_intr_errno(timeo);
595 break;
596 }
597
598 release_sock(sk);
599 timeo = schedule_timeout(timeo);
600 lock_sock(sk);
601 }
602 __set_current_state(TASK_RUNNING);
603 remove_wait_queue(sk_sleep(sk), &wait);
604
605 if (err)
606 goto done;
607
608 newsock->state = SS_CONNECTED;
609
610 BT_DBG("new socket %p", ch);
611
612done:
613 release_sock(sk);
614 return err;
615}
616
617static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
618{
619 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
620 struct sock *sk = sock->sk;
621
622 BT_DBG("sock %p, sk %p", sock, sk);
623
624 addr->sa_family = AF_BLUETOOTH;
625 *len = sizeof(struct sockaddr_sco);
626
627 if (peer)
628 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
629 else
630 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);
631
632 return 0;
633}
634
635static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
636 struct msghdr *msg, size_t len)
637{
638 struct sock *sk = sock->sk;
639 int err;
640
641 BT_DBG("sock %p, sk %p", sock, sk);
642
643 err = sock_error(sk);
644 if (err)
645 return err;
646
647 if (msg->msg_flags & MSG_OOB)
648 return -EOPNOTSUPP;
649
650 lock_sock(sk);
651
652 if (sk->sk_state == BT_CONNECTED)
653 err = sco_send_frame(sk, msg, len);
654 else
655 err = -ENOTCONN;
656
657 release_sock(sk);
658 return err;
659}
660
661static int sco_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
662{
663 struct sock *sk = sock->sk;
664 int err = 0;
665
666 BT_DBG("sk %p", sk);
667
668 lock_sock(sk);
669
670 switch (optname) {
671 default:
672 err = -ENOPROTOOPT;
673 break;
674 }
675
676 release_sock(sk);
677 return err;
678}
679
680static int sco_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
681{
682 struct sock *sk = sock->sk;
683 struct sco_options opts;
684 struct sco_conninfo cinfo;
685 int len, err = 0;
686
687 BT_DBG("sk %p", sk);
688
689 if (get_user(len, optlen))
690 return -EFAULT;
691
692 lock_sock(sk);
693
694 switch (optname) {
695 case SCO_OPTIONS:
696 if (sk->sk_state != BT_CONNECTED) {
697 err = -ENOTCONN;
698 break;
699 }
700
701 opts.mtu = sco_pi(sk)->conn->mtu;
702
703 BT_DBG("mtu %d", opts.mtu);
704
705 len = min_t(unsigned int, len, sizeof(opts));
706 if (copy_to_user(optval, (char *)&opts, len))
707 err = -EFAULT;
708
709 break;
710
711 case SCO_CONNINFO:
712 if (sk->sk_state != BT_CONNECTED) {
713 err = -ENOTCONN;
714 break;
715 }
716
717 memset(&cinfo, 0, sizeof(cinfo));
718 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
719 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
720
721 len = min_t(unsigned int, len, sizeof(cinfo));
722 if (copy_to_user(optval, (char *)&cinfo, len))
723 err = -EFAULT;
724
725 break;
726
727 default:
728 err = -ENOPROTOOPT;
729 break;
730 }
731
732 release_sock(sk);
733 return err;
734}
735
736static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
737{
738 struct sock *sk = sock->sk;
739 int len, err = 0;
740
741 BT_DBG("sk %p", sk);
742
743 if (level == SOL_SCO)
744 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
745
746 if (get_user(len, optlen))
747 return -EFAULT;
748
749 lock_sock(sk);
750
751 switch (optname) {
752 default:
753 err = -ENOPROTOOPT;
754 break;
755 }
756
757 release_sock(sk);
758 return err;
759}
760
761static int sco_sock_shutdown(struct socket *sock, int how)
762{
763 struct sock *sk = sock->sk;
764 int err = 0;
765
766 BT_DBG("sock %p, sk %p", sock, sk);
767
768 if (!sk)
769 return 0;
770
771 lock_sock(sk);
772 if (!sk->sk_shutdown) {
773 sk->sk_shutdown = SHUTDOWN_MASK;
774 sco_sock_clear_timer(sk);
775 __sco_sock_close(sk);
776
777 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
778 err = bt_sock_wait_state(sk, BT_CLOSED,
779 sk->sk_lingertime);
780 }
781 release_sock(sk);
782 return err;
783}
784
785static int sco_sock_release(struct socket *sock)
786{
787 struct sock *sk = sock->sk;
788 int err = 0;
789
790 BT_DBG("sock %p, sk %p", sock, sk);
791
792 if (!sk)
793 return 0;
794
795 sco_sock_close(sk);
796
797 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
798 lock_sock(sk);
799 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
800 release_sock(sk);
801 }
802
803 sock_orphan(sk);
804 sco_sock_kill(sk);
805 return err;
806}
807
808static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
809{
810 BT_DBG("conn %p", conn);
811
812 sco_pi(sk)->conn = conn;
813 conn->sk = sk;
814
815 if (parent)
816 bt_accept_enqueue(parent, sk);
817}
818
819/* Delete channel.
820 * Must be called on the locked socket. */
821static void sco_chan_del(struct sock *sk, int err)
822{
823 struct sco_conn *conn;
824
825 conn = sco_pi(sk)->conn;
826
827 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
828
829 if (conn) {
830 sco_conn_lock(conn);
831 conn->sk = NULL;
832 sco_pi(sk)->conn = NULL;
833 sco_conn_unlock(conn);
834
835 if (conn->hcon)
836 hci_conn_put(conn->hcon);
837 }
838
839 sk->sk_state = BT_CLOSED;
840 sk->sk_err = err;
841 sk->sk_state_change(sk);
842
843 sock_set_flag(sk, SOCK_ZAPPED);
844}
845
846static void sco_conn_ready(struct sco_conn *conn)
847{
848 struct sock *parent;
849 struct sock *sk = conn->sk;
850
851 BT_DBG("conn %p", conn);
852
853 sco_conn_lock(conn);
854
855 if (sk) {
856 sco_sock_clear_timer(sk);
857 bh_lock_sock(sk);
858 sk->sk_state = BT_CONNECTED;
859 sk->sk_state_change(sk);
860 bh_unlock_sock(sk);
861 } else {
862 parent = sco_get_sock_listen(conn->src);
863 if (!parent)
864 goto done;
865
866 bh_lock_sock(parent);
867
868 sk = sco_sock_alloc(sock_net(parent), NULL,
869 BTPROTO_SCO, GFP_ATOMIC);
870 if (!sk) {
871 bh_unlock_sock(parent);
872 goto done;
873 }
874
875 sco_sock_init(sk, parent);
876
877 bacpy(&bt_sk(sk)->src, conn->src);
878 bacpy(&bt_sk(sk)->dst, conn->dst);
879
880 hci_conn_hold(conn->hcon);
881 __sco_chan_add(conn, sk, parent);
882
883 sk->sk_state = BT_CONNECTED;
884
885 /* Wake up parent */
886 parent->sk_data_ready(parent, 1);
887
888 bh_unlock_sock(parent);
889 }
890
891done:
892 sco_conn_unlock(conn);
893}
894
895/* ----- SCO interface with lower layer (HCI) ----- */
896static int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 type)
897{
898 register struct sock *sk;
899 struct hlist_node *node;
900 int lm = 0;
901
902 if (type != SCO_LINK && type != ESCO_LINK)
903 return -EINVAL;
904
905 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
906
907 /* Find listening sockets */
908 read_lock(&sco_sk_list.lock);
909 sk_for_each(sk, node, &sco_sk_list.head) {
910 if (sk->sk_state != BT_LISTEN)
911 continue;
912
913 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr) ||
914 !bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
915 lm |= HCI_LM_ACCEPT;
916 break;
917 }
918 }
919 read_unlock(&sco_sk_list.lock);
920
921 return lm;
922}
923
924static int sco_connect_cfm(struct hci_conn *hcon, __u8 status)
925{
926 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
927
928 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
929 return -EINVAL;
930
931 if (!status) {
932 struct sco_conn *conn;
933
934 conn = sco_conn_add(hcon, status);
935 if (conn)
936 sco_conn_ready(conn);
937 } else
938 sco_conn_del(hcon, bt_to_errno(status));
939
940 return 0;
941}
942
943static int sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
944{
945 BT_DBG("hcon %p reason %d", hcon, reason);
946
947 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
948 return -EINVAL;
949
950 sco_conn_del(hcon, bt_to_errno(reason));
951
952 return 0;
953}
954
955static int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
956{
957 struct sco_conn *conn = hcon->sco_data;
958
959 if (!conn)
960 goto drop;
961
962 BT_DBG("conn %p len %d", conn, skb->len);
963
964 if (skb->len) {
965 sco_recv_frame(conn, skb);
966 return 0;
967 }
968
969drop:
970 kfree_skb(skb);
971 return 0;
972}
973
974static int sco_debugfs_show(struct seq_file *f, void *p)
975{
976 struct sock *sk;
977 struct hlist_node *node;
978
979 read_lock_bh(&sco_sk_list.lock);
980
981 sk_for_each(sk, node, &sco_sk_list.head) {
982 seq_printf(f, "%s %s %d\n", batostr(&bt_sk(sk)->src),
983 batostr(&bt_sk(sk)->dst), sk->sk_state);
984 }
985
986 read_unlock_bh(&sco_sk_list.lock);
987
988 return 0;
989}
990
991static int sco_debugfs_open(struct inode *inode, struct file *file)
992{
993 return single_open(file, sco_debugfs_show, inode->i_private);
994}
995
996static const struct file_operations sco_debugfs_fops = {
997 .open = sco_debugfs_open,
998 .read = seq_read,
999 .llseek = seq_lseek,
1000 .release = single_release,
1001};
1002
1003static struct dentry *sco_debugfs;
1004
1005static const struct proto_ops sco_sock_ops = {
1006 .family = PF_BLUETOOTH,
1007 .owner = THIS_MODULE,
1008 .release = sco_sock_release,
1009 .bind = sco_sock_bind,
1010 .connect = sco_sock_connect,
1011 .listen = sco_sock_listen,
1012 .accept = sco_sock_accept,
1013 .getname = sco_sock_getname,
1014 .sendmsg = sco_sock_sendmsg,
1015 .recvmsg = bt_sock_recvmsg,
1016 .poll = bt_sock_poll,
1017 .ioctl = bt_sock_ioctl,
1018 .mmap = sock_no_mmap,
1019 .socketpair = sock_no_socketpair,
1020 .shutdown = sco_sock_shutdown,
1021 .setsockopt = sco_sock_setsockopt,
1022 .getsockopt = sco_sock_getsockopt
1023};
1024
1025static const struct net_proto_family sco_sock_family_ops = {
1026 .family = PF_BLUETOOTH,
1027 .owner = THIS_MODULE,
1028 .create = sco_sock_create,
1029};
1030
1031static struct hci_proto sco_hci_proto = {
1032 .name = "SCO",
1033 .id = HCI_PROTO_SCO,
1034 .connect_ind = sco_connect_ind,
1035 .connect_cfm = sco_connect_cfm,
1036 .disconn_cfm = sco_disconn_cfm,
1037 .recv_scodata = sco_recv_scodata
1038};
1039
1040int __init sco_init(void)
1041{
1042 int err;
1043
1044 err = proto_register(&sco_proto, 0);
1045 if (err < 0)
1046 return err;
1047
1048 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1049 if (err < 0) {
1050 BT_ERR("SCO socket registration failed");
1051 goto error;
1052 }
1053
1054 err = hci_register_proto(&sco_hci_proto);
1055 if (err < 0) {
1056 BT_ERR("SCO protocol registration failed");
1057 bt_sock_unregister(BTPROTO_SCO);
1058 goto error;
1059 }
1060
1061 if (bt_debugfs) {
1062 sco_debugfs = debugfs_create_file("sco", 0444,
1063 bt_debugfs, NULL, &sco_debugfs_fops);
1064 if (!sco_debugfs)
1065 BT_ERR("Failed to create SCO debug file");
1066 }
1067
1068 BT_INFO("SCO socket layer initialized");
1069
1070 return 0;
1071
1072error:
1073 proto_unregister(&sco_proto);
1074 return err;
1075}
1076
1077void __exit sco_exit(void)
1078{
1079 debugfs_remove(sco_debugfs);
1080
1081 if (bt_sock_unregister(BTPROTO_SCO) < 0)
1082 BT_ERR("SCO socket unregistration failed");
1083
1084 if (hci_unregister_proto(&sco_hci_proto) < 0)
1085 BT_ERR("SCO protocol unregistration failed");
1086
1087 proto_unregister(&sco_proto);
1088}
1089
1090module_param(disable_esco, bool, 0644);
1091MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");