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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
31#include <net/bluetooth/bluetooth.h>
32#include <net/bluetooth/hci_core.h>
33#include <net/bluetooth/sco.h>
34
35static bool disable_esco;
36
37static const struct proto_ops sco_sock_ops;
38
39static struct bt_sock_list sco_sk_list = {
40 .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
41};
42
43/* ---- SCO connections ---- */
44struct sco_conn {
45 struct hci_conn *hcon;
46
47 spinlock_t lock;
48 struct sock *sk;
49
50 unsigned int mtu;
51};
52
53#define sco_conn_lock(c) spin_lock(&c->lock);
54#define sco_conn_unlock(c) spin_unlock(&c->lock);
55
56static void sco_sock_close(struct sock *sk);
57static void sco_sock_kill(struct sock *sk);
58
59/* ----- SCO socket info ----- */
60#define sco_pi(sk) ((struct sco_pinfo *) sk)
61
62struct sco_pinfo {
63 struct bt_sock bt;
64 bdaddr_t src;
65 bdaddr_t dst;
66 __u32 flags;
67 __u16 setting;
68 struct sco_conn *conn;
69};
70
71/* ---- SCO timers ---- */
72#define SCO_CONN_TIMEOUT (HZ * 40)
73#define SCO_DISCONN_TIMEOUT (HZ * 2)
74
75static void sco_sock_timeout(unsigned long arg)
76{
77 struct sock *sk = (struct sock *)arg;
78
79 BT_DBG("sock %p state %d", sk, sk->sk_state);
80
81 bh_lock_sock(sk);
82 sk->sk_err = ETIMEDOUT;
83 sk->sk_state_change(sk);
84 bh_unlock_sock(sk);
85
86 sco_sock_kill(sk);
87 sock_put(sk);
88}
89
90static void sco_sock_set_timer(struct sock *sk, long timeout)
91{
92 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
93 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
94}
95
96static void sco_sock_clear_timer(struct sock *sk)
97{
98 BT_DBG("sock %p state %d", sk, sk->sk_state);
99 sk_stop_timer(sk, &sk->sk_timer);
100}
101
102/* ---- SCO connections ---- */
103static struct sco_conn *sco_conn_add(struct hci_conn *hcon)
104{
105 struct hci_dev *hdev = hcon->hdev;
106 struct sco_conn *conn = hcon->sco_data;
107
108 if (conn)
109 return conn;
110
111 conn = kzalloc(sizeof(struct sco_conn), GFP_KERNEL);
112 if (!conn)
113 return NULL;
114
115 spin_lock_init(&conn->lock);
116
117 hcon->sco_data = conn;
118 conn->hcon = hcon;
119
120 if (hdev->sco_mtu > 0)
121 conn->mtu = hdev->sco_mtu;
122 else
123 conn->mtu = 60;
124
125 BT_DBG("hcon %p conn %p", hcon, conn);
126
127 return conn;
128}
129
130/* Delete channel.
131 * Must be called on the locked socket. */
132static void sco_chan_del(struct sock *sk, int err)
133{
134 struct sco_conn *conn;
135
136 conn = sco_pi(sk)->conn;
137
138 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
139
140 if (conn) {
141 sco_conn_lock(conn);
142 conn->sk = NULL;
143 sco_pi(sk)->conn = NULL;
144 sco_conn_unlock(conn);
145
146 if (conn->hcon)
147 hci_conn_drop(conn->hcon);
148 }
149
150 sk->sk_state = BT_CLOSED;
151 sk->sk_err = err;
152 sk->sk_state_change(sk);
153
154 sock_set_flag(sk, SOCK_ZAPPED);
155}
156
157static void sco_conn_del(struct hci_conn *hcon, int err)
158{
159 struct sco_conn *conn = hcon->sco_data;
160 struct sock *sk;
161
162 if (!conn)
163 return;
164
165 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
166
167 /* Kill socket */
168 sco_conn_lock(conn);
169 sk = conn->sk;
170 sco_conn_unlock(conn);
171
172 if (sk) {
173 sock_hold(sk);
174 bh_lock_sock(sk);
175 sco_sock_clear_timer(sk);
176 sco_chan_del(sk, err);
177 bh_unlock_sock(sk);
178 sco_sock_kill(sk);
179 sock_put(sk);
180 }
181
182 hcon->sco_data = NULL;
183 kfree(conn);
184}
185
186static void __sco_chan_add(struct sco_conn *conn, struct sock *sk,
187 struct sock *parent)
188{
189 BT_DBG("conn %p", conn);
190
191 sco_pi(sk)->conn = conn;
192 conn->sk = sk;
193
194 if (parent)
195 bt_accept_enqueue(parent, sk);
196}
197
198static int sco_chan_add(struct sco_conn *conn, struct sock *sk,
199 struct sock *parent)
200{
201 int err = 0;
202
203 sco_conn_lock(conn);
204 if (conn->sk)
205 err = -EBUSY;
206 else
207 __sco_chan_add(conn, sk, parent);
208
209 sco_conn_unlock(conn);
210 return err;
211}
212
213static int sco_connect(struct sock *sk)
214{
215 struct sco_conn *conn;
216 struct hci_conn *hcon;
217 struct hci_dev *hdev;
218 int err, type;
219
220 BT_DBG("%pMR -> %pMR", &sco_pi(sk)->src, &sco_pi(sk)->dst);
221
222 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src);
223 if (!hdev)
224 return -EHOSTUNREACH;
225
226 hci_dev_lock(hdev);
227
228 if (lmp_esco_capable(hdev) && !disable_esco)
229 type = ESCO_LINK;
230 else
231 type = SCO_LINK;
232
233 if (sco_pi(sk)->setting == BT_VOICE_TRANSPARENT &&
234 (!lmp_transp_capable(hdev) || !lmp_esco_capable(hdev))) {
235 err = -EOPNOTSUPP;
236 goto done;
237 }
238
239 hcon = hci_connect_sco(hdev, type, &sco_pi(sk)->dst,
240 sco_pi(sk)->setting);
241 if (IS_ERR(hcon)) {
242 err = PTR_ERR(hcon);
243 goto done;
244 }
245
246 conn = sco_conn_add(hcon);
247 if (!conn) {
248 hci_conn_drop(hcon);
249 err = -ENOMEM;
250 goto done;
251 }
252
253 /* Update source addr of the socket */
254 bacpy(&sco_pi(sk)->src, &hcon->src);
255
256 err = sco_chan_add(conn, sk, NULL);
257 if (err)
258 goto done;
259
260 if (hcon->state == BT_CONNECTED) {
261 sco_sock_clear_timer(sk);
262 sk->sk_state = BT_CONNECTED;
263 } else {
264 sk->sk_state = BT_CONNECT;
265 sco_sock_set_timer(sk, sk->sk_sndtimeo);
266 }
267
268done:
269 hci_dev_unlock(hdev);
270 hci_dev_put(hdev);
271 return err;
272}
273
274static int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
275{
276 struct sco_conn *conn = sco_pi(sk)->conn;
277 struct sk_buff *skb;
278 int err;
279
280 /* Check outgoing MTU */
281 if (len > conn->mtu)
282 return -EINVAL;
283
284 BT_DBG("sk %p len %d", sk, len);
285
286 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
287 if (!skb)
288 return err;
289
290 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
291 kfree_skb(skb);
292 return -EFAULT;
293 }
294
295 hci_send_sco(conn->hcon, skb);
296
297 return len;
298}
299
300static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
301{
302 struct sock *sk;
303
304 sco_conn_lock(conn);
305 sk = conn->sk;
306 sco_conn_unlock(conn);
307
308 if (!sk)
309 goto drop;
310
311 BT_DBG("sk %p len %d", sk, skb->len);
312
313 if (sk->sk_state != BT_CONNECTED)
314 goto drop;
315
316 if (!sock_queue_rcv_skb(sk, skb))
317 return;
318
319drop:
320 kfree_skb(skb);
321}
322
323/* -------- Socket interface ---------- */
324static struct sock *__sco_get_sock_listen_by_addr(bdaddr_t *ba)
325{
326 struct sock *sk;
327
328 sk_for_each(sk, &sco_sk_list.head) {
329 if (sk->sk_state != BT_LISTEN)
330 continue;
331
332 if (!bacmp(&sco_pi(sk)->src, ba))
333 return sk;
334 }
335
336 return NULL;
337}
338
339/* Find socket listening on source bdaddr.
340 * Returns closest match.
341 */
342static struct sock *sco_get_sock_listen(bdaddr_t *src)
343{
344 struct sock *sk = NULL, *sk1 = NULL;
345
346 read_lock(&sco_sk_list.lock);
347
348 sk_for_each(sk, &sco_sk_list.head) {
349 if (sk->sk_state != BT_LISTEN)
350 continue;
351
352 /* Exact match. */
353 if (!bacmp(&sco_pi(sk)->src, src))
354 break;
355
356 /* Closest match */
357 if (!bacmp(&sco_pi(sk)->src, BDADDR_ANY))
358 sk1 = sk;
359 }
360
361 read_unlock(&sco_sk_list.lock);
362
363 return sk ? sk : sk1;
364}
365
366static void sco_sock_destruct(struct sock *sk)
367{
368 BT_DBG("sk %p", sk);
369
370 skb_queue_purge(&sk->sk_receive_queue);
371 skb_queue_purge(&sk->sk_write_queue);
372}
373
374static void sco_sock_cleanup_listen(struct sock *parent)
375{
376 struct sock *sk;
377
378 BT_DBG("parent %p", parent);
379
380 /* Close not yet accepted channels */
381 while ((sk = bt_accept_dequeue(parent, NULL))) {
382 sco_sock_close(sk);
383 sco_sock_kill(sk);
384 }
385
386 parent->sk_state = BT_CLOSED;
387 sock_set_flag(parent, SOCK_ZAPPED);
388}
389
390/* Kill socket (only if zapped and orphan)
391 * Must be called on unlocked socket.
392 */
393static void sco_sock_kill(struct sock *sk)
394{
395 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
396 return;
397
398 BT_DBG("sk %p state %d", sk, sk->sk_state);
399
400 /* Kill poor orphan */
401 bt_sock_unlink(&sco_sk_list, sk);
402 sock_set_flag(sk, SOCK_DEAD);
403 sock_put(sk);
404}
405
406static void __sco_sock_close(struct sock *sk)
407{
408 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
409
410 switch (sk->sk_state) {
411 case BT_LISTEN:
412 sco_sock_cleanup_listen(sk);
413 break;
414
415 case BT_CONNECTED:
416 case BT_CONFIG:
417 if (sco_pi(sk)->conn->hcon) {
418 sk->sk_state = BT_DISCONN;
419 sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
420 sco_conn_lock(sco_pi(sk)->conn);
421 hci_conn_drop(sco_pi(sk)->conn->hcon);
422 sco_pi(sk)->conn->hcon = NULL;
423 sco_conn_unlock(sco_pi(sk)->conn);
424 } else
425 sco_chan_del(sk, ECONNRESET);
426 break;
427
428 case BT_CONNECT2:
429 case BT_CONNECT:
430 case BT_DISCONN:
431 sco_chan_del(sk, ECONNRESET);
432 break;
433
434 default:
435 sock_set_flag(sk, SOCK_ZAPPED);
436 break;
437 }
438}
439
440/* Must be called on unlocked socket. */
441static void sco_sock_close(struct sock *sk)
442{
443 sco_sock_clear_timer(sk);
444 lock_sock(sk);
445 __sco_sock_close(sk);
446 release_sock(sk);
447 sco_sock_kill(sk);
448}
449
450static void sco_sock_init(struct sock *sk, struct sock *parent)
451{
452 BT_DBG("sk %p", sk);
453
454 if (parent) {
455 sk->sk_type = parent->sk_type;
456 bt_sk(sk)->flags = bt_sk(parent)->flags;
457 security_sk_clone(parent, sk);
458 }
459}
460
461static struct proto sco_proto = {
462 .name = "SCO",
463 .owner = THIS_MODULE,
464 .obj_size = sizeof(struct sco_pinfo)
465};
466
467static struct sock *sco_sock_alloc(struct net *net, struct socket *sock,
468 int proto, gfp_t prio, int kern)
469{
470 struct sock *sk;
471
472 sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto, kern);
473 if (!sk)
474 return NULL;
475
476 sock_init_data(sock, sk);
477 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
478
479 sk->sk_destruct = sco_sock_destruct;
480 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
481
482 sock_reset_flag(sk, SOCK_ZAPPED);
483
484 sk->sk_protocol = proto;
485 sk->sk_state = BT_OPEN;
486
487 sco_pi(sk)->setting = BT_VOICE_CVSD_16BIT;
488
489 setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk);
490
491 bt_sock_link(&sco_sk_list, sk);
492 return sk;
493}
494
495static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
496 int kern)
497{
498 struct sock *sk;
499
500 BT_DBG("sock %p", sock);
501
502 sock->state = SS_UNCONNECTED;
503
504 if (sock->type != SOCK_SEQPACKET)
505 return -ESOCKTNOSUPPORT;
506
507 sock->ops = &sco_sock_ops;
508
509 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
510 if (!sk)
511 return -ENOMEM;
512
513 sco_sock_init(sk, NULL);
514 return 0;
515}
516
517static int sco_sock_bind(struct socket *sock, struct sockaddr *addr,
518 int addr_len)
519{
520 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
521 struct sock *sk = sock->sk;
522 int err = 0;
523
524 BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
525
526 if (!addr || addr->sa_family != AF_BLUETOOTH)
527 return -EINVAL;
528
529 if (addr_len < sizeof(struct sockaddr_sco))
530 return -EINVAL;
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)
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 *len, 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 *len = sizeof(struct sockaddr_sco);
693
694 if (peer)
695 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->dst);
696 else
697 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->src);
698
699 return 0;
700}
701
702static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
703 size_t len)
704{
705 struct sock *sk = sock->sk;
706 int err;
707
708 BT_DBG("sock %p, sk %p", sock, sk);
709
710 err = sock_error(sk);
711 if (err)
712 return err;
713
714 if (msg->msg_flags & MSG_OOB)
715 return -EOPNOTSUPP;
716
717 lock_sock(sk);
718
719 if (sk->sk_state == BT_CONNECTED)
720 err = sco_send_frame(sk, msg, len);
721 else
722 err = -ENOTCONN;
723
724 release_sock(sk);
725 return err;
726}
727
728static void sco_conn_defer_accept(struct hci_conn *conn, u16 setting)
729{
730 struct hci_dev *hdev = conn->hdev;
731
732 BT_DBG("conn %p", conn);
733
734 conn->state = BT_CONFIG;
735
736 if (!lmp_esco_capable(hdev)) {
737 struct hci_cp_accept_conn_req cp;
738
739 bacpy(&cp.bdaddr, &conn->dst);
740 cp.role = 0x00; /* Ignored */
741
742 hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp);
743 } else {
744 struct hci_cp_accept_sync_conn_req cp;
745
746 bacpy(&cp.bdaddr, &conn->dst);
747 cp.pkt_type = cpu_to_le16(conn->pkt_type);
748
749 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
750 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
751 cp.content_format = cpu_to_le16(setting);
752
753 switch (setting & SCO_AIRMODE_MASK) {
754 case SCO_AIRMODE_TRANSP:
755 if (conn->pkt_type & ESCO_2EV3)
756 cp.max_latency = cpu_to_le16(0x0008);
757 else
758 cp.max_latency = cpu_to_le16(0x000D);
759 cp.retrans_effort = 0x02;
760 break;
761 case SCO_AIRMODE_CVSD:
762 cp.max_latency = cpu_to_le16(0xffff);
763 cp.retrans_effort = 0xff;
764 break;
765 }
766
767 hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ,
768 sizeof(cp), &cp);
769 }
770}
771
772static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
773 size_t len, int flags)
774{
775 struct sock *sk = sock->sk;
776 struct sco_pinfo *pi = sco_pi(sk);
777
778 lock_sock(sk);
779
780 if (sk->sk_state == BT_CONNECT2 &&
781 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
782 sco_conn_defer_accept(pi->conn->hcon, pi->setting);
783 sk->sk_state = BT_CONFIG;
784
785 release_sock(sk);
786 return 0;
787 }
788
789 release_sock(sk);
790
791 return bt_sock_recvmsg(sock, msg, len, flags);
792}
793
794static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
795 char __user *optval, unsigned int optlen)
796{
797 struct sock *sk = sock->sk;
798 int len, err = 0;
799 struct bt_voice voice;
800 u32 opt;
801
802 BT_DBG("sk %p", sk);
803
804 lock_sock(sk);
805
806 switch (optname) {
807
808 case BT_DEFER_SETUP:
809 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
810 err = -EINVAL;
811 break;
812 }
813
814 if (get_user(opt, (u32 __user *) optval)) {
815 err = -EFAULT;
816 break;
817 }
818
819 if (opt)
820 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
821 else
822 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
823 break;
824
825 case BT_VOICE:
826 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
827 sk->sk_state != BT_CONNECT2) {
828 err = -EINVAL;
829 break;
830 }
831
832 voice.setting = sco_pi(sk)->setting;
833
834 len = min_t(unsigned int, sizeof(voice), optlen);
835 if (copy_from_user((char *)&voice, optval, len)) {
836 err = -EFAULT;
837 break;
838 }
839
840 /* Explicitly check for these values */
841 if (voice.setting != BT_VOICE_TRANSPARENT &&
842 voice.setting != BT_VOICE_CVSD_16BIT) {
843 err = -EINVAL;
844 break;
845 }
846
847 sco_pi(sk)->setting = voice.setting;
848 break;
849
850 default:
851 err = -ENOPROTOOPT;
852 break;
853 }
854
855 release_sock(sk);
856 return err;
857}
858
859static int sco_sock_getsockopt_old(struct socket *sock, int optname,
860 char __user *optval, int __user *optlen)
861{
862 struct sock *sk = sock->sk;
863 struct sco_options opts;
864 struct sco_conninfo cinfo;
865 int len, err = 0;
866
867 BT_DBG("sk %p", sk);
868
869 if (get_user(len, optlen))
870 return -EFAULT;
871
872 lock_sock(sk);
873
874 switch (optname) {
875 case SCO_OPTIONS:
876 if (sk->sk_state != BT_CONNECTED &&
877 !(sk->sk_state == BT_CONNECT2 &&
878 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
879 err = -ENOTCONN;
880 break;
881 }
882
883 opts.mtu = sco_pi(sk)->conn->mtu;
884
885 BT_DBG("mtu %d", opts.mtu);
886
887 len = min_t(unsigned int, len, sizeof(opts));
888 if (copy_to_user(optval, (char *)&opts, len))
889 err = -EFAULT;
890
891 break;
892
893 case SCO_CONNINFO:
894 if (sk->sk_state != BT_CONNECTED &&
895 !(sk->sk_state == BT_CONNECT2 &&
896 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
897 err = -ENOTCONN;
898 break;
899 }
900
901 memset(&cinfo, 0, sizeof(cinfo));
902 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
903 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
904
905 len = min_t(unsigned int, len, sizeof(cinfo));
906 if (copy_to_user(optval, (char *)&cinfo, len))
907 err = -EFAULT;
908
909 break;
910
911 default:
912 err = -ENOPROTOOPT;
913 break;
914 }
915
916 release_sock(sk);
917 return err;
918}
919
920static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
921 char __user *optval, int __user *optlen)
922{
923 struct sock *sk = sock->sk;
924 int len, err = 0;
925 struct bt_voice voice;
926
927 BT_DBG("sk %p", sk);
928
929 if (level == SOL_SCO)
930 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
931
932 if (get_user(len, optlen))
933 return -EFAULT;
934
935 lock_sock(sk);
936
937 switch (optname) {
938
939 case BT_DEFER_SETUP:
940 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
941 err = -EINVAL;
942 break;
943 }
944
945 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
946 (u32 __user *)optval))
947 err = -EFAULT;
948
949 break;
950
951 case BT_VOICE:
952 voice.setting = sco_pi(sk)->setting;
953
954 len = min_t(unsigned int, len, sizeof(voice));
955 if (copy_to_user(optval, (char *)&voice, len))
956 err = -EFAULT;
957
958 break;
959
960 default:
961 err = -ENOPROTOOPT;
962 break;
963 }
964
965 release_sock(sk);
966 return err;
967}
968
969static int sco_sock_shutdown(struct socket *sock, int how)
970{
971 struct sock *sk = sock->sk;
972 int err = 0;
973
974 BT_DBG("sock %p, sk %p", sock, sk);
975
976 if (!sk)
977 return 0;
978
979 sock_hold(sk);
980 lock_sock(sk);
981
982 if (!sk->sk_shutdown) {
983 sk->sk_shutdown = SHUTDOWN_MASK;
984 sco_sock_clear_timer(sk);
985 __sco_sock_close(sk);
986
987 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
988 !(current->flags & PF_EXITING))
989 err = bt_sock_wait_state(sk, BT_CLOSED,
990 sk->sk_lingertime);
991 }
992
993 release_sock(sk);
994 sock_put(sk);
995
996 return err;
997}
998
999static int sco_sock_release(struct socket *sock)
1000{
1001 struct sock *sk = sock->sk;
1002 int err = 0;
1003
1004 BT_DBG("sock %p, sk %p", sock, sk);
1005
1006 if (!sk)
1007 return 0;
1008
1009 sco_sock_close(sk);
1010
1011 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1012 !(current->flags & PF_EXITING)) {
1013 lock_sock(sk);
1014 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1015 release_sock(sk);
1016 }
1017
1018 sock_orphan(sk);
1019 sco_sock_kill(sk);
1020 return err;
1021}
1022
1023static void sco_conn_ready(struct sco_conn *conn)
1024{
1025 struct sock *parent;
1026 struct sock *sk = conn->sk;
1027
1028 BT_DBG("conn %p", conn);
1029
1030 if (sk) {
1031 sco_sock_clear_timer(sk);
1032 bh_lock_sock(sk);
1033 sk->sk_state = BT_CONNECTED;
1034 sk->sk_state_change(sk);
1035 bh_unlock_sock(sk);
1036 } else {
1037 sco_conn_lock(conn);
1038
1039 if (!conn->hcon) {
1040 sco_conn_unlock(conn);
1041 return;
1042 }
1043
1044 parent = sco_get_sock_listen(&conn->hcon->src);
1045 if (!parent) {
1046 sco_conn_unlock(conn);
1047 return;
1048 }
1049
1050 bh_lock_sock(parent);
1051
1052 sk = sco_sock_alloc(sock_net(parent), NULL,
1053 BTPROTO_SCO, GFP_ATOMIC, 0);
1054 if (!sk) {
1055 bh_unlock_sock(parent);
1056 sco_conn_unlock(conn);
1057 return;
1058 }
1059
1060 sco_sock_init(sk, parent);
1061
1062 bacpy(&sco_pi(sk)->src, &conn->hcon->src);
1063 bacpy(&sco_pi(sk)->dst, &conn->hcon->dst);
1064
1065 hci_conn_hold(conn->hcon);
1066 __sco_chan_add(conn, sk, parent);
1067
1068 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1069 sk->sk_state = BT_CONNECT2;
1070 else
1071 sk->sk_state = BT_CONNECTED;
1072
1073 /* Wake up parent */
1074 parent->sk_data_ready(parent);
1075
1076 bh_unlock_sock(parent);
1077
1078 sco_conn_unlock(conn);
1079 }
1080}
1081
1082/* ----- SCO interface with lower layer (HCI) ----- */
1083int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1084{
1085 struct sock *sk;
1086 int lm = 0;
1087
1088 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1089
1090 /* Find listening sockets */
1091 read_lock(&sco_sk_list.lock);
1092 sk_for_each(sk, &sco_sk_list.head) {
1093 if (sk->sk_state != BT_LISTEN)
1094 continue;
1095
1096 if (!bacmp(&sco_pi(sk)->src, &hdev->bdaddr) ||
1097 !bacmp(&sco_pi(sk)->src, BDADDR_ANY)) {
1098 lm |= HCI_LM_ACCEPT;
1099
1100 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1101 *flags |= HCI_PROTO_DEFER;
1102 break;
1103 }
1104 }
1105 read_unlock(&sco_sk_list.lock);
1106
1107 return lm;
1108}
1109
1110static void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
1111{
1112 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1113 return;
1114
1115 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1116
1117 if (!status) {
1118 struct sco_conn *conn;
1119
1120 conn = sco_conn_add(hcon);
1121 if (conn)
1122 sco_conn_ready(conn);
1123 } else
1124 sco_conn_del(hcon, bt_to_errno(status));
1125}
1126
1127static void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1128{
1129 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1130 return;
1131
1132 BT_DBG("hcon %p reason %d", hcon, reason);
1133
1134 sco_conn_del(hcon, bt_to_errno(reason));
1135}
1136
1137void sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
1138{
1139 struct sco_conn *conn = hcon->sco_data;
1140
1141 if (!conn)
1142 goto drop;
1143
1144 BT_DBG("conn %p len %d", conn, skb->len);
1145
1146 if (skb->len) {
1147 sco_recv_frame(conn, skb);
1148 return;
1149 }
1150
1151drop:
1152 kfree_skb(skb);
1153}
1154
1155static struct hci_cb sco_cb = {
1156 .name = "SCO",
1157 .connect_cfm = sco_connect_cfm,
1158 .disconn_cfm = sco_disconn_cfm,
1159};
1160
1161static int sco_debugfs_show(struct seq_file *f, void *p)
1162{
1163 struct sock *sk;
1164
1165 read_lock(&sco_sk_list.lock);
1166
1167 sk_for_each(sk, &sco_sk_list.head) {
1168 seq_printf(f, "%pMR %pMR %d\n", &sco_pi(sk)->src,
1169 &sco_pi(sk)->dst, sk->sk_state);
1170 }
1171
1172 read_unlock(&sco_sk_list.lock);
1173
1174 return 0;
1175}
1176
1177static int sco_debugfs_open(struct inode *inode, struct file *file)
1178{
1179 return single_open(file, sco_debugfs_show, inode->i_private);
1180}
1181
1182static const struct file_operations sco_debugfs_fops = {
1183 .open = sco_debugfs_open,
1184 .read = seq_read,
1185 .llseek = seq_lseek,
1186 .release = single_release,
1187};
1188
1189static struct dentry *sco_debugfs;
1190
1191static const struct proto_ops sco_sock_ops = {
1192 .family = PF_BLUETOOTH,
1193 .owner = THIS_MODULE,
1194 .release = sco_sock_release,
1195 .bind = sco_sock_bind,
1196 .connect = sco_sock_connect,
1197 .listen = sco_sock_listen,
1198 .accept = sco_sock_accept,
1199 .getname = sco_sock_getname,
1200 .sendmsg = sco_sock_sendmsg,
1201 .recvmsg = sco_sock_recvmsg,
1202 .poll = bt_sock_poll,
1203 .ioctl = bt_sock_ioctl,
1204 .mmap = sock_no_mmap,
1205 .socketpair = sock_no_socketpair,
1206 .shutdown = sco_sock_shutdown,
1207 .setsockopt = sco_sock_setsockopt,
1208 .getsockopt = sco_sock_getsockopt
1209};
1210
1211static const struct net_proto_family sco_sock_family_ops = {
1212 .family = PF_BLUETOOTH,
1213 .owner = THIS_MODULE,
1214 .create = sco_sock_create,
1215};
1216
1217int __init sco_init(void)
1218{
1219 int err;
1220
1221 BUILD_BUG_ON(sizeof(struct sockaddr_sco) > sizeof(struct sockaddr));
1222
1223 err = proto_register(&sco_proto, 0);
1224 if (err < 0)
1225 return err;
1226
1227 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1228 if (err < 0) {
1229 BT_ERR("SCO socket registration failed");
1230 goto error;
1231 }
1232
1233 err = bt_procfs_init(&init_net, "sco", &sco_sk_list, NULL);
1234 if (err < 0) {
1235 BT_ERR("Failed to create SCO proc file");
1236 bt_sock_unregister(BTPROTO_SCO);
1237 goto error;
1238 }
1239
1240 BT_INFO("SCO socket layer initialized");
1241
1242 hci_register_cb(&sco_cb);
1243
1244 if (IS_ERR_OR_NULL(bt_debugfs))
1245 return 0;
1246
1247 sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs,
1248 NULL, &sco_debugfs_fops);
1249
1250 return 0;
1251
1252error:
1253 proto_unregister(&sco_proto);
1254 return err;
1255}
1256
1257void sco_exit(void)
1258{
1259 bt_procfs_cleanup(&init_net, "sco");
1260
1261 debugfs_remove(sco_debugfs);
1262
1263 hci_unregister_cb(&sco_cb);
1264
1265 bt_sock_unregister(BTPROTO_SCO);
1266
1267 proto_unregister(&sco_proto);
1268}
1269
1270module_param(disable_esco, bool, 0644);
1271MODULE_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");