aboutsummaryrefslogtreecommitdiff
path: root/net/bluetooth/sco.c
blob: 2a5953b4405d05b6908439134e73179ece873483 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
/*
   BlueZ - Bluetooth protocol stack for Linux
   Copyright (C) 2000-2001 Qualcomm Incorporated

   Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
   SOFTWARE IS DISCLAIMED.
*/

/* Bluetooth SCO sockets. */

#include <linux/module.h>

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/socket.h>
#include <linux/skbuff.h>
#include <linux/device.h>
#include <linux/list.h>
#include <net/sock.h>

#include <asm/system.h>
#include <asm/uaccess.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/sco.h>

#ifndef CONFIG_BT_SCO_DEBUG
#undef  BT_DBG
#define BT_DBG(D...)
#endif

#define VERSION "0.5"

static const struct proto_ops sco_sock_ops;

static struct bt_sock_list sco_sk_list = {
	.lock = RW_LOCK_UNLOCKED
};

static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent);
static void sco_chan_del(struct sock *sk, int err);

static int  sco_conn_del(struct hci_conn *conn, int err);

static void sco_sock_close(struct sock *sk);
static void sco_sock_kill(struct sock *sk);

/* ---- SCO timers ---- */
static void sco_sock_timeout(unsigned long arg)
{
	struct sock *sk = (struct sock *) arg;

	BT_DBG("sock %p state %d", sk, sk->sk_state);

	bh_lock_sock(sk);
	sk->sk_err = ETIMEDOUT;
	sk->sk_state_change(sk);
	bh_unlock_sock(sk);

	sco_sock_kill(sk);
	sock_put(sk);
}

static void sco_sock_set_timer(struct sock *sk, long timeout)
{
	BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
	sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
}

static void sco_sock_clear_timer(struct sock *sk)
{
	BT_DBG("sock %p state %d", sk, sk->sk_state);
	sk_stop_timer(sk, &sk->sk_timer);
}

/* ---- SCO connections ---- */
static struct sco_conn *sco_conn_add(struct hci_conn *hcon, __u8 status)
{
	struct hci_dev *hdev = hcon->hdev;
	struct sco_conn *conn = hcon->sco_data;

	if (conn || status)
		return conn;

	conn = kzalloc(sizeof(struct sco_conn), GFP_ATOMIC);
	if (!conn)
		return NULL;

	spin_lock_init(&conn->lock);

	hcon->sco_data = conn;
	conn->hcon = hcon;

	conn->src = &hdev->bdaddr;
	conn->dst = &hcon->dst;

	if (hdev->sco_mtu > 0)
		conn->mtu = hdev->sco_mtu;
	else
		conn->mtu = 60;

	BT_DBG("hcon %p conn %p", hcon, conn);

	return conn;
}

static inline struct sock *sco_chan_get(struct sco_conn *conn)
{
	struct sock *sk = NULL;
	sco_conn_lock(conn);
	sk = conn->sk;
	sco_conn_unlock(conn);
	return sk;
}

static int sco_conn_del(struct hci_conn *hcon, int err)
{
	struct sco_conn *conn;
	struct sock *sk;

	if (!(conn = hcon->sco_data))
		return 0;

	BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);

	/* Kill socket */
	if ((sk = sco_chan_get(conn))) {
		bh_lock_sock(sk);
		sco_sock_clear_timer(sk);
		sco_chan_del(sk, err);
		bh_unlock_sock(sk);
		sco_sock_kill(sk);
	}

	hcon->sco_data = NULL;
	kfree(conn);
	return 0;
}

static inline int sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
{
	int err = 0;

	sco_conn_lock(conn);
	if (conn->sk) {
		err = -EBUSY;
	} else {
		__sco_chan_add(conn, sk, parent);
	}
	sco_conn_unlock(conn);
	return err;
}

static int sco_connect(struct sock *sk)
{
	bdaddr_t *src = &bt_sk(sk)->src;
	bdaddr_t *dst = &bt_sk(sk)->dst;
	struct sco_conn *conn;
	struct hci_conn *hcon;
	struct hci_dev  *hdev;
	int err, type;

	BT_DBG("%s -> %s", batostr(src), batostr(dst));

	if (!(hdev = hci_get_route(dst, src)))
		return -EHOSTUNREACH;

	hci_dev_lock_bh(hdev);

	err = -ENOMEM;

	type = lmp_esco_capable(hdev) ? ESCO_LINK : SCO_LINK;

	hcon = hci_connect(hdev, type, dst);
	if (!hcon)
		goto done;

	conn = sco_conn_add(hcon, 0);
	if (!conn) {
		hci_conn_put(hcon);
		goto done;
	}

	/* Update source addr of the socket */
	bacpy(src, conn->src);

	err = sco_chan_add(conn, sk, NULL);
	if (err)
		goto done;

	if (hcon->state == BT_CONNECTED) {
		sco_sock_clear_timer(sk);
		sk->sk_state = BT_CONNECTED;
	} else {
		sk->sk_state = BT_CONNECT;
		sco_sock_set_timer(sk, sk->sk_sndtimeo);
	}

done:
	hci_dev_unlock_bh(hdev);
	hci_dev_put(hdev);
	return err;
}

static inline int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
{
	struct sco_conn *conn = sco_pi(sk)->conn;
	struct sk_buff *skb;
	int err, count;

	/* Check outgoing MTU */
	if (len > conn->mtu)
		return -EINVAL;

	BT_DBG("sk %p len %d", sk, len);

	count = min_t(unsigned int, conn->mtu, len);
	if (!(skb = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err)))
		return err;

	if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
		err = -EFAULT;
		goto fail;
	}

	if ((err = hci_send_sco(conn->hcon, skb)) < 0)
		return err;

	return count;

fail:
	kfree_skb(skb);
	return err;
}

static inline void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
{
	struct sock *sk = sco_chan_get(conn);

	if (!sk)
		goto drop;

	BT_DBG("sk %p len %d", sk, skb->len);

	if (sk->sk_state != BT_CONNECTED)
		goto drop;

	if (!sock_queue_rcv_skb(sk, skb))
		return;

drop:
	kfree_skb(skb);
	return;
}

/* -------- Socket interface ---------- */
static struct sock *__sco_get_sock_by_addr(bdaddr_t *ba)
{
	struct sock *sk;
	struct hlist_node *node;

	sk_for_each(sk, node, &sco_sk_list.head)
		if (!bacmp(&bt_sk(sk)->src, ba))
			goto found;
	sk = NULL;
found:
	return sk;
}

/* Find socket listening on source bdaddr.
 * Returns closest match.
 */
static struct sock *sco_get_sock_listen(bdaddr_t *src)
{
	struct sock *sk = NULL, *sk1 = NULL;
	struct hlist_node *node;

	read_lock(&sco_sk_list.lock);

	sk_for_each(sk, node, &sco_sk_list.head) {
		if (sk->sk_state != BT_LISTEN)
			continue;

		/* Exact match. */
		if (!bacmp(&bt_sk(sk)->src, src))
			break;

		/* Closest match */
		if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
			sk1 = sk;
	}

	read_unlock(&sco_sk_list.lock);

	return node ? sk : sk1;
}

static void sco_sock_destruct(struct sock *sk)
{
	BT_DBG("sk %p", sk);

	skb_queue_purge(&sk->sk_receive_queue);
	skb_queue_purge(&sk->sk_write_queue);
}

static void sco_sock_cleanup_listen(struct sock *parent)
{
	struct sock *sk;

	BT_DBG("parent %p", parent);

	/* Close not yet accepted channels */
	while ((sk = bt_accept_dequeue(parent, NULL))) {
		sco_sock_close(sk);
		sco_sock_kill(sk);
	}

	parent->sk_state  = BT_CLOSED;
	sock_set_flag(parent, SOCK_ZAPPED);
}

/* Kill socket (only if zapped and orphan)
 * Must be called on unlocked socket.
 */
static void sco_sock_kill(struct sock *sk)
{
	if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
		return;

	BT_DBG("sk %p state %d", sk, sk->sk_state);

	/* Kill poor orphan */
	bt_sock_unlink(&sco_sk_list, sk);
	sock_set_flag(sk, SOCK_DEAD);
	sock_put(sk);
}

/* Close socket.
 * Must be called on unlocked socket.
 */
static void sco_sock_close(struct sock *sk)
{
	struct sco_conn *conn;

	sco_sock_clear_timer(sk);

	lock_sock(sk);

	conn = sco_pi(sk)->conn;

	BT_DBG("sk %p state %d conn %p socket %p", sk, sk->sk_state, conn, sk->sk_socket);

	switch (sk->sk_state) {
	case BT_LISTEN:
		sco_sock_cleanup_listen(sk);
		break;

	case BT_CONNECTED:
	case BT_CONFIG:
	case BT_CONNECT:
	case BT_DISCONN:
		sco_chan_del(sk, ECONNRESET);
		break;

	default:
		sock_set_flag(sk, SOCK_ZAPPED);
		break;
	}

	release_sock(sk);

	sco_sock_kill(sk);
}

static void sco_sock_init(struct sock *sk, struct sock *parent)
{
	BT_DBG("sk %p", sk);

	if (parent)
		sk->sk_type = parent->sk_type;
}

static struct proto sco_proto = {
	.name		= "SCO",
	.owner		= THIS_MODULE,
	.obj_size	= sizeof(struct sco_pinfo)
};

static struct sock *sco_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
{
	struct sock *sk;

	sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto);
	if (!sk)
		return NULL;

	sock_init_data(sock, sk);
	INIT_LIST_HEAD(&bt_sk(sk)->accept_q);

	sk->sk_destruct = sco_sock_destruct;
	sk->sk_sndtimeo = SCO_CONN_TIMEOUT;

	sock_reset_flag(sk, SOCK_ZAPPED);

	sk->sk_protocol = proto;
	sk->sk_state    = BT_OPEN;

	setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk);

	bt_sock_link(&sco_sk_list, sk);
	return sk;
}

static int sco_sock_create(struct net *net, struct socket *sock, int protocol)
{
	struct sock *sk;

	BT_DBG("sock %p", sock);

	sock->state = SS_UNCONNECTED;

	if (sock->type != SOCK_SEQPACKET)
		return -ESOCKTNOSUPPORT;

	sock->ops = &sco_sock_ops;

	sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC);
	if (!sk)
		return -ENOMEM;

	sco_sock_init(sk, NULL);
	return 0;
}

static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
{
	struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
	struct sock *sk = sock->sk;
	bdaddr_t *src = &sa->sco_bdaddr;
	int err = 0;

	BT_DBG("sk %p %s", sk, batostr(&sa->sco_bdaddr));

	if (!addr || addr->sa_family != AF_BLUETOOTH)
		return -EINVAL;

	lock_sock(sk);

	if (sk->sk_state != BT_OPEN) {
		err = -EBADFD;
		goto done;
	}

	write_lock_bh(&sco_sk_list.lock);

	if (bacmp(src, BDADDR_ANY) && __sco_get_sock_by_addr(src)) {
		err = -EADDRINUSE;
	} else {
		/* Save source address */
		bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
		sk->sk_state = BT_BOUND;
	}

	write_unlock_bh(&sco_sk_list.lock);

done:
	release_sock(sk);
	return err;
}

static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
{
	struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
	struct sock *sk = sock->sk;
	int err = 0;


	BT_DBG("sk %p", sk);

	if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_sco))
		return -EINVAL;

	if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
		return -EBADFD;

	if (sk->sk_type != SOCK_SEQPACKET)
		return -EINVAL;

	lock_sock(sk);

	/* Set destination address and psm */
	bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);

	if ((err = sco_connect(sk)))
		goto done;

	err = bt_sock_wait_state(sk, BT_CONNECTED,
			sock_sndtimeo(sk, flags & O_NONBLOCK));

done:
	release_sock(sk);
	return err;
}

static int sco_sock_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
	int err = 0;

	BT_DBG("sk %p backlog %d", sk, backlog);

	lock_sock(sk);

	if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
		err = -EBADFD;
		goto done;
	}

	sk->sk_max_ack_backlog = backlog;
	sk->sk_ack_backlog = 0;
	sk->sk_state = BT_LISTEN;

done:
	release_sock(sk);
	return err;
}

static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
{
	DECLARE_WAITQUEUE(wait, current);
	struct sock *sk = sock->sk, *ch;
	long timeo;
	int err = 0;

	lock_sock(sk);

	if (sk->sk_state != BT_LISTEN) {
		err = -EBADFD;
		goto done;
	}

	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);

	BT_DBG("sk %p timeo %ld", sk, timeo);

	/* Wait for an incoming connection. (wake-one). */
	add_wait_queue_exclusive(sk->sk_sleep, &wait);
	while (!(ch = bt_accept_dequeue(sk, newsock))) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (!timeo) {
			err = -EAGAIN;
			break;
		}

		release_sock(sk);
		timeo = schedule_timeout(timeo);
		lock_sock(sk);

		if (sk->sk_state != BT_LISTEN) {
			err = -EBADFD;
			break;
		}

		if (signal_pending(current)) {
			err = sock_intr_errno(timeo);
			break;
		}
	}
	set_current_state(TASK_RUNNING);
	remove_wait_queue(sk->sk_sleep, &wait);

	if (err)
		goto done;

	newsock->state = SS_CONNECTED;

	BT_DBG("new socket %p", ch);

done:
	release_sock(sk);
	return err;
}

static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
{
	struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
	struct sock *sk = sock->sk;

	BT_DBG("sock %p, sk %p", sock, sk);

	addr->sa_family = AF_BLUETOOTH;
	*len = sizeof(struct sockaddr_sco);

	if (peer)
		bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
	else
		bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);

	return 0;
}

static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
			    struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	int err = 0;

	BT_DBG("sock %p, sk %p", sock, sk);

	err = sock_error(sk);
	if (err)
		return err;

	if (msg->msg_flags & MSG_OOB)
		return -EOPNOTSUPP;

	lock_sock(sk);

	if (sk->sk_state == BT_CONNECTED)
		err = sco_send_frame(sk, msg, len);
	else
		err = -ENOTCONN;

	release_sock(sk);
	return err;
}

static int sco_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
{
	struct sock *sk = sock->sk;
	int err = 0;

	BT_DBG("sk %p", sk);

	lock_sock(sk);

	switch (optname) {
	default:
		err = -ENOPROTOOPT;
		break;
	}

	release_sock(sk);
	return err;
}

static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
	struct sco_options opts;
	struct sco_conninfo cinfo;
	int len, err = 0;

	BT_DBG("sk %p", sk);

	if (get_user(len, optlen))
		return -EFAULT;

	lock_sock(sk);

	switch (optname) {
	case SCO_OPTIONS:
		if (sk->sk_state != BT_CONNECTED) {
			err = -ENOTCONN;
			break;
		}

		opts.mtu = sco_pi(sk)->conn->mtu;

		BT_DBG("mtu %d", opts.mtu);

		len = min_t(unsigned int, len, sizeof(opts));
		if (copy_to_user(optval, (char *)&opts, len))
			err = -EFAULT;

		break;

	case SCO_CONNINFO:
		if (sk->sk_state != BT_CONNECTED) {
			err = -ENOTCONN;
			break;
		}

		cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
		memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);

		len = min_t(unsigned int, len, sizeof(cinfo));
		if (copy_to_user(optval, (char *)&cinfo, len))
			err = -EFAULT;

		break;

	default:
		err = -ENOPROTOOPT;
		break;
	}

	release_sock(sk);
	return err;
}

static int sco_sock_release(struct socket *sock)
{
	struct sock *sk = sock->sk;
	int err = 0;

	BT_DBG("sock %p, sk %p", sock, sk);

	if (!sk)
		return 0;

	sco_sock_close(sk);

	if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
		lock_sock(sk);
		err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
		release_sock(sk);
	}

	sock_orphan(sk);
	sco_sock_kill(sk);
	return err;
}

static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
{
	BT_DBG("conn %p", conn);

	sco_pi(sk)->conn = conn;
	conn->sk = sk;

	if (parent)
		bt_accept_enqueue(parent, sk);
}

/* Delete channel.
 * Must be called on the locked socket. */
static void sco_chan_del(struct sock *sk, int err)
{
	struct sco_conn *conn;

	conn = sco_pi(sk)->conn;

	BT_DBG("sk %p, conn %p, err %d", sk, conn, err);

	if (conn) {
		sco_conn_lock(conn);
		conn->sk = NULL;
		sco_pi(sk)->conn = NULL;
		sco_conn_unlock(conn);
		hci_conn_put(conn->hcon);
	}

	sk->sk_state = BT_CLOSED;
	sk->sk_err   = err;
	sk->sk_state_change(sk);

	sock_set_flag(sk, SOCK_ZAPPED);
}

static void sco_conn_ready(struct sco_conn *conn)
{
	struct sock *parent, *sk;

	BT_DBG("conn %p", conn);

	sco_conn_lock(conn);

	if ((sk = conn->sk)) {
		sco_sock_clear_timer(sk);
		bh_lock_sock(sk);
		sk->sk_state = BT_CONNECTED;
		sk->sk_state_change(sk);
		bh_unlock_sock(sk);
	} else {
		parent = sco_get_sock_listen(conn->src);
		if (!parent)
			goto done;

		bh_lock_sock(parent);

		sk = sco_sock_alloc(sock_net(parent), NULL, BTPROTO_SCO, GFP_ATOMIC);
		if (!sk) {
			bh_unlock_sock(parent);
			goto done;
		}

		sco_sock_init(sk, parent);

		bacpy(&bt_sk(sk)->src, conn->src);
		bacpy(&bt_sk(sk)->dst, conn->dst);

		hci_conn_hold(conn->hcon);
		__sco_chan_add(conn, sk, parent);

		sk->sk_state = BT_CONNECTED;

		/* Wake up parent */
		parent->sk_data_ready(parent, 1);

		bh_unlock_sock(parent);
	}

done:
	sco_conn_unlock(conn);
}

/* ----- SCO interface with lower layer (HCI) ----- */
static int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 type)
{
	BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));

	/* Always accept connection */
	return HCI_LM_ACCEPT;
}

static int sco_connect_cfm(struct hci_conn *hcon, __u8 status)
{
	BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);

	if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
		return 0;

	if (!status) {
		struct sco_conn *conn;

		conn = sco_conn_add(hcon, status);
		if (conn)
			sco_conn_ready(conn);
	} else
		sco_conn_del(hcon, bt_err(status));

	return 0;
}

static int sco_disconn_ind(struct hci_conn *hcon, __u8 reason)
{
	BT_DBG("hcon %p reason %d", hcon, reason);

	if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
		return 0;

	sco_conn_del(hcon, bt_err(reason));

	return 0;
}

static int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
{
	struct sco_conn *conn = hcon->sco_data;

	if (!conn)
		goto drop;

	BT_DBG("conn %p len %d", conn, skb->len);

	if (skb->len) {
		sco_recv_frame(conn, skb);
		return 0;
	}

drop:
	kfree_skb(skb);
	return 0;
}

static ssize_t sco_sysfs_show(struct class *dev, char *buf)
{
	struct sock *sk;
	struct hlist_node *node;
	char *str = buf;

	read_lock_bh(&sco_sk_list.lock);

	sk_for_each(sk, node, &sco_sk_list.head) {
		str += sprintf(str, "%s %s %d\n",
				batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
				sk->sk_state);
	}

	read_unlock_bh(&sco_sk_list.lock);

	return (str - buf);
}

static CLASS_ATTR(sco, S_IRUGO, sco_sysfs_show, NULL);

static const struct proto_ops sco_sock_ops = {
	.family		= PF_BLUETOOTH,
	.owner		= THIS_MODULE,
	.release	= sco_sock_release,
	.bind		= sco_sock_bind,
	.connect	= sco_sock_connect,
	.listen		= sco_sock_listen,
	.accept		= sco_sock_accept,
	.getname	= sco_sock_getname,
	.sendmsg	= sco_sock_sendmsg,
	.recvmsg	= bt_sock_recvmsg,
	.poll		= bt_sock_poll,
	.ioctl		= sock_no_ioctl,
	.mmap		= sock_no_mmap,
	.socketpair	= sock_no_socketpair,
	.shutdown	= sock_no_shutdown,
	.setsockopt	= sco_sock_setsockopt,
	.getsockopt	= sco_sock_getsockopt
};

static struct net_proto_family sco_sock_family_ops = {
	.family	= PF_BLUETOOTH,
	.owner	= THIS_MODULE,
	.create	= sco_sock_create,
};

static struct hci_proto sco_hci_proto = {
	.name		= "SCO",
	.id		= HCI_PROTO_SCO,
	.connect_ind	= sco_connect_ind,
	.connect_cfm	= sco_connect_cfm,
	.disconn_ind	= sco_disconn_ind,
	.recv_scodata	= sco_recv_scodata
};

static int __init sco_init(void)
{
	int err;

	err = proto_register(&sco_proto, 0);
	if (err < 0)
		return err;

	err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
	if (err < 0) {
		BT_ERR("SCO socket registration failed");
		goto error;
	}

	err = hci_register_proto(&sco_hci_proto);
	if (err < 0) {
		BT_ERR("SCO protocol registration failed");
		bt_sock_unregister(BTPROTO_SCO);
		goto error;
	}

	if (class_create_file(bt_class, &class_attr_sco) < 0)
		BT_ERR("Failed to create SCO info file");

	BT_INFO("SCO (Voice Link) ver %s", VERSION);
	BT_INFO("SCO socket layer initialized");

	return 0;

error:
	proto_unregister(&sco_proto);
	return err;
}

static void __exit sco_exit(void)
{
	class_remove_file(bt_class, &class_attr_sco);

	if (bt_sock_unregister(BTPROTO_SCO) < 0)
		BT_ERR("SCO socket unregistration failed");

	if (hci_unregister_proto(&sco_hci_proto) < 0)
		BT_ERR("SCO protocol unregistration failed");

	proto_unregister(&sco_proto);
}

module_init(sco_init);
module_exit(sco_exit);

MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("Bluetooth SCO ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS("bt-proto-2");