summaryrefslogtreecommitdiff
path: root/net/bluetooth/iso.c
blob: 035bb5d25f850a7d427f87b2d5bc960526b3fe0f (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
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
// SPDX-License-Identifier: GPL-2.0
/*
 * BlueZ - Bluetooth protocol stack for Linux
 *
 * Copyright (C) 2022 Intel Corporation
 */

#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/sched/signal.h>

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

static const struct proto_ops iso_sock_ops;

static struct bt_sock_list iso_sk_list = {
	.lock = __RW_LOCK_UNLOCKED(iso_sk_list.lock)
};

/* ---- ISO connections ---- */
struct iso_conn {
	struct hci_conn	*hcon;

	/* @lock: spinlock protecting changes to iso_conn fields */
	spinlock_t	lock;
	struct sock	*sk;

	struct delayed_work	timeout_work;

	struct sk_buff	*rx_skb;
	__u32		rx_len;
	__u16		tx_sn;
};

#define iso_conn_lock(c)	spin_lock(&(c)->lock)
#define iso_conn_unlock(c)	spin_unlock(&(c)->lock)

static void iso_sock_close(struct sock *sk);
static void iso_sock_kill(struct sock *sk);

/* ----- ISO socket info ----- */
#define iso_pi(sk) ((struct iso_pinfo *)sk)

#define EIR_SERVICE_DATA_LENGTH 4
#define BASE_MAX_LENGTH (HCI_MAX_PER_AD_LENGTH - EIR_SERVICE_DATA_LENGTH)

struct iso_pinfo {
	struct bt_sock		bt;
	bdaddr_t		src;
	__u8			src_type;
	bdaddr_t		dst;
	__u8			dst_type;
	__u8			bc_sid;
	__u8			bc_num_bis;
	__u8			bc_bis[ISO_MAX_NUM_BIS];
	__u16			sync_handle;
	__u32			flags;
	struct bt_iso_qos	qos;
	__u8			base_len;
	__u8			base[BASE_MAX_LENGTH];
	struct iso_conn		*conn;
};

/* ---- ISO timers ---- */
#define ISO_CONN_TIMEOUT	(HZ * 40)
#define ISO_DISCONN_TIMEOUT	(HZ * 2)

static void iso_sock_timeout(struct work_struct *work)
{
	struct iso_conn *conn = container_of(work, struct iso_conn,
					     timeout_work.work);
	struct sock *sk;

	iso_conn_lock(conn);
	sk = conn->sk;
	if (sk)
		sock_hold(sk);
	iso_conn_unlock(conn);

	if (!sk)
		return;

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

	lock_sock(sk);
	sk->sk_err = ETIMEDOUT;
	sk->sk_state_change(sk);
	release_sock(sk);
	sock_put(sk);
}

static void iso_sock_set_timer(struct sock *sk, long timeout)
{
	if (!iso_pi(sk)->conn)
		return;

	BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
	cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
	schedule_delayed_work(&iso_pi(sk)->conn->timeout_work, timeout);
}

static void iso_sock_clear_timer(struct sock *sk)
{
	if (!iso_pi(sk)->conn)
		return;

	BT_DBG("sock %p state %d", sk, sk->sk_state);
	cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
}

/* ---- ISO connections ---- */
static struct iso_conn *iso_conn_add(struct hci_conn *hcon)
{
	struct iso_conn *conn = hcon->iso_data;

	if (conn)
		return conn;

	conn = kzalloc(sizeof(*conn), GFP_KERNEL);
	if (!conn)
		return NULL;

	spin_lock_init(&conn->lock);
	INIT_DELAYED_WORK(&conn->timeout_work, iso_sock_timeout);

	hcon->iso_data = conn;
	conn->hcon = hcon;
	conn->tx_sn = 0;

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

	return conn;
}

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

	conn = iso_pi(sk)->conn;

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

	if (conn) {
		iso_conn_lock(conn);
		conn->sk = NULL;
		iso_pi(sk)->conn = NULL;
		iso_conn_unlock(conn);

		if (conn->hcon)
			hci_conn_drop(conn->hcon);
	}

	sk->sk_state = BT_CLOSED;
	sk->sk_err   = err;

	parent = bt_sk(sk)->parent;
	if (parent) {
		bt_accept_unlink(sk);
		parent->sk_data_ready(parent);
	} else {
		sk->sk_state_change(sk);
	}

	sock_set_flag(sk, SOCK_ZAPPED);
}

static void iso_conn_del(struct hci_conn *hcon, int err)
{
	struct iso_conn *conn = hcon->iso_data;
	struct sock *sk;

	if (!conn)
		return;

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

	/* Kill socket */
	iso_conn_lock(conn);
	sk = conn->sk;
	if (sk)
		sock_hold(sk);
	iso_conn_unlock(conn);

	if (sk) {
		lock_sock(sk);
		iso_sock_clear_timer(sk);
		iso_chan_del(sk, err);
		release_sock(sk);
		sock_put(sk);
	}

	/* Ensure no more work items will run before freeing conn. */
	cancel_delayed_work_sync(&conn->timeout_work);

	hcon->iso_data = NULL;
	kfree(conn);
}

static int __iso_chan_add(struct iso_conn *conn, struct sock *sk,
			  struct sock *parent)
{
	BT_DBG("conn %p", conn);

	if (iso_pi(sk)->conn == conn && conn->sk == sk)
		return 0;

	if (conn->sk) {
		BT_ERR("conn->sk already set");
		return -EBUSY;
	}

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

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

	return 0;
}

static int iso_chan_add(struct iso_conn *conn, struct sock *sk,
			struct sock *parent)
{
	int err;

	iso_conn_lock(conn);
	err = __iso_chan_add(conn, sk, parent);
	iso_conn_unlock(conn);

	return err;
}

static inline u8 le_addr_type(u8 bdaddr_type)
{
	if (bdaddr_type == BDADDR_LE_PUBLIC)
		return ADDR_LE_DEV_PUBLIC;
	else
		return ADDR_LE_DEV_RANDOM;
}

static int iso_connect_bis(struct sock *sk)
{
	struct iso_conn *conn;
	struct hci_conn *hcon;
	struct hci_dev  *hdev;
	int err;

	BT_DBG("%pMR", &iso_pi(sk)->src);

	hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
			     iso_pi(sk)->src_type);
	if (!hdev)
		return -EHOSTUNREACH;

	hci_dev_lock(hdev);

	if (!bis_capable(hdev)) {
		err = -EOPNOTSUPP;
		goto unlock;
	}

	/* Fail if out PHYs are marked as disabled */
	if (!iso_pi(sk)->qos.out.phy) {
		err = -EINVAL;
		goto unlock;
	}

	hcon = hci_connect_bis(hdev, &iso_pi(sk)->dst,
			       le_addr_type(iso_pi(sk)->dst_type),
			       &iso_pi(sk)->qos, iso_pi(sk)->base_len,
			       iso_pi(sk)->base);
	if (IS_ERR(hcon)) {
		err = PTR_ERR(hcon);
		goto unlock;
	}

	conn = iso_conn_add(hcon);
	if (!conn) {
		hci_conn_drop(hcon);
		err = -ENOMEM;
		goto unlock;
	}

	hci_dev_unlock(hdev);
	hci_dev_put(hdev);

	lock_sock(sk);

	/* Update source addr of the socket */
	bacpy(&iso_pi(sk)->src, &hcon->src);

	err = iso_chan_add(conn, sk, NULL);
	if (err)
		goto release;

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

release:
	release_sock(sk);
	return err;

unlock:
	hci_dev_unlock(hdev);
	hci_dev_put(hdev);
	return err;
}

static int iso_connect_cis(struct sock *sk)
{
	struct iso_conn *conn;
	struct hci_conn *hcon;
	struct hci_dev  *hdev;
	int err;

	BT_DBG("%pMR -> %pMR", &iso_pi(sk)->src, &iso_pi(sk)->dst);

	hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
			     iso_pi(sk)->src_type);
	if (!hdev)
		return -EHOSTUNREACH;

	hci_dev_lock(hdev);

	if (!cis_central_capable(hdev)) {
		err = -EOPNOTSUPP;
		goto unlock;
	}

	/* Fail if either PHYs are marked as disabled */
	if (!iso_pi(sk)->qos.in.phy && !iso_pi(sk)->qos.out.phy) {
		err = -EINVAL;
		goto unlock;
	}

	/* Just bind if DEFER_SETUP has been set */
	if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
		hcon = hci_bind_cis(hdev, &iso_pi(sk)->dst,
				    le_addr_type(iso_pi(sk)->dst_type),
				    &iso_pi(sk)->qos);
		if (IS_ERR(hcon)) {
			err = PTR_ERR(hcon);
			goto unlock;
		}
	} else {
		hcon = hci_connect_cis(hdev, &iso_pi(sk)->dst,
				       le_addr_type(iso_pi(sk)->dst_type),
				       &iso_pi(sk)->qos);
		if (IS_ERR(hcon)) {
			err = PTR_ERR(hcon);
			goto unlock;
		}
	}

	conn = iso_conn_add(hcon);
	if (!conn) {
		hci_conn_drop(hcon);
		err = -ENOMEM;
		goto unlock;
	}

	hci_dev_unlock(hdev);
	hci_dev_put(hdev);

	lock_sock(sk);

	/* Update source addr of the socket */
	bacpy(&iso_pi(sk)->src, &hcon->src);

	err = iso_chan_add(conn, sk, NULL);
	if (err)
		goto release;

	if (hcon->state == BT_CONNECTED) {
		iso_sock_clear_timer(sk);
		sk->sk_state = BT_CONNECTED;
	} else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
		iso_sock_clear_timer(sk);
		sk->sk_state = BT_CONNECT;
	} else {
		sk->sk_state = BT_CONNECT;
		iso_sock_set_timer(sk, sk->sk_sndtimeo);
	}

release:
	release_sock(sk);
	return err;

unlock:
	hci_dev_unlock(hdev);
	hci_dev_put(hdev);
	return err;
}

static struct bt_iso_qos *iso_sock_get_qos(struct sock *sk)
{
	if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
		return &iso_pi(sk)->conn->hcon->iso_qos;

	return &iso_pi(sk)->qos;
}

static int iso_send_frame(struct sock *sk, struct sk_buff *skb)
{
	struct iso_conn *conn = iso_pi(sk)->conn;
	struct bt_iso_qos *qos = iso_sock_get_qos(sk);
	struct hci_iso_data_hdr *hdr;
	int len = 0;

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

	if (skb->len > qos->out.sdu)
		return -EMSGSIZE;

	len = skb->len;

	/* Push ISO data header */
	hdr = skb_push(skb, HCI_ISO_DATA_HDR_SIZE);
	hdr->sn = cpu_to_le16(conn->tx_sn++);
	hdr->slen = cpu_to_le16(hci_iso_data_len_pack(len,
						      HCI_ISO_STATUS_VALID));

	if (sk->sk_state == BT_CONNECTED)
		hci_send_iso(conn->hcon, skb);
	else
		len = -ENOTCONN;

	return len;
}

static void iso_recv_frame(struct iso_conn *conn, struct sk_buff *skb)
{
	struct sock *sk;

	iso_conn_lock(conn);
	sk = conn->sk;
	iso_conn_unlock(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);
}

/* -------- Socket interface ---------- */
static struct sock *__iso_get_sock_listen_by_addr(bdaddr_t *ba)
{
	struct sock *sk;

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

		if (!bacmp(&iso_pi(sk)->src, ba))
			return sk;
	}

	return NULL;
}

static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
						 __u8 sid)
{
	struct sock *sk;

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

		if (bacmp(&iso_pi(sk)->src, ba))
			continue;

		if (bacmp(&iso_pi(sk)->dst, bc))
			continue;

		if (iso_pi(sk)->bc_sid == sid)
			return sk;
	}

	return NULL;
}

typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);

/* Find socket listening:
 * source bdaddr (Unicast)
 * destination bdaddr (Broadcast only)
 * match func - pass NULL to ignore
 * match func data - pass -1 to ignore
 * Returns closest match.
 */
static struct sock *iso_get_sock_listen(bdaddr_t *src, bdaddr_t *dst,
					iso_sock_match_t match, void *data)
{
	struct sock *sk = NULL, *sk1 = NULL;

	read_lock(&iso_sk_list.lock);

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

		/* Match Broadcast destination */
		if (bacmp(dst, BDADDR_ANY) && bacmp(&iso_pi(sk)->dst, dst))
			continue;

		/* Use Match function if provided */
		if (match && !match(sk, data))
			continue;

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

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

	read_unlock(&iso_sk_list.lock);

	return sk ? sk : sk1;
}

static void iso_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 iso_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))) {
		iso_sock_close(sk);
		iso_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 iso_sock_kill(struct sock *sk)
{
	if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||
	    sock_flag(sk, SOCK_DEAD))
		return;

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

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

static void iso_conn_defer_reject(struct hci_conn *conn)
{
	struct hci_cp_le_reject_cis cp;

	BT_DBG("conn %p", conn);

	memset(&cp, 0, sizeof(cp));
	cp.handle = cpu_to_le16(conn->handle);
	cp.reason = HCI_ERROR_REJ_BAD_ADDR;
	hci_send_cmd(conn->hdev, HCI_OP_LE_REJECT_CIS, sizeof(cp), &cp);
}

static void __iso_sock_close(struct sock *sk)
{
	BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);

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

	case BT_CONNECTED:
	case BT_CONFIG:
		if (iso_pi(sk)->conn->hcon) {
			sk->sk_state = BT_DISCONN;
			iso_sock_set_timer(sk, ISO_DISCONN_TIMEOUT);
			iso_conn_lock(iso_pi(sk)->conn);
			hci_conn_drop(iso_pi(sk)->conn->hcon);
			iso_pi(sk)->conn->hcon = NULL;
			iso_conn_unlock(iso_pi(sk)->conn);
		} else {
			iso_chan_del(sk, ECONNRESET);
		}
		break;

	case BT_CONNECT2:
		if (iso_pi(sk)->conn->hcon)
			iso_conn_defer_reject(iso_pi(sk)->conn->hcon);
		iso_chan_del(sk, ECONNRESET);
		break;
	case BT_CONNECT:
		/* In case of DEFER_SETUP the hcon would be bound to CIG which
		 * needs to be removed so just call hci_conn_del so the cleanup
		 * callback do what is needed.
		 */
		if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags) &&
		    iso_pi(sk)->conn->hcon) {
			hci_conn_del(iso_pi(sk)->conn->hcon);
			iso_pi(sk)->conn->hcon = NULL;
		}

		iso_chan_del(sk, ECONNRESET);
		break;
	case BT_DISCONN:
		iso_chan_del(sk, ECONNRESET);
		break;

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

/* Must be called on unlocked socket. */
static void iso_sock_close(struct sock *sk)
{
	iso_sock_clear_timer(sk);
	lock_sock(sk);
	__iso_sock_close(sk);
	release_sock(sk);
	iso_sock_kill(sk);
}

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

	if (parent) {
		sk->sk_type = parent->sk_type;
		bt_sk(sk)->flags = bt_sk(parent)->flags;
		security_sk_clone(parent, sk);
	}
}

static struct proto iso_proto = {
	.name		= "ISO",
	.owner		= THIS_MODULE,
	.obj_size	= sizeof(struct iso_pinfo)
};

#define DEFAULT_IO_QOS \
{ \
	.interval	= 10000u, \
	.latency	= 10u, \
	.sdu		= 40u, \
	.phy		= BT_ISO_PHY_2M, \
	.rtn		= 2u, \
}

static struct bt_iso_qos default_qos = {
	.cig		= BT_ISO_QOS_CIG_UNSET,
	.cis		= BT_ISO_QOS_CIS_UNSET,
	.sca		= 0x00,
	.packing	= 0x00,
	.framing	= 0x00,
	.in		= DEFAULT_IO_QOS,
	.out		= DEFAULT_IO_QOS,
};

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

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

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

	sk->sk_destruct = iso_sock_destruct;
	sk->sk_sndtimeo = ISO_CONN_TIMEOUT;

	sock_reset_flag(sk, SOCK_ZAPPED);

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

	/* Set address type as public as default src address is BDADDR_ANY */
	iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;

	iso_pi(sk)->qos = default_qos;

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

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

	BT_DBG("sock %p", sock);

	sock->state = SS_UNCONNECTED;

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

	sock->ops = &iso_sock_ops;

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

	iso_sock_init(sk, NULL);
	return 0;
}

static int iso_sock_bind_bc(struct socket *sock, struct sockaddr *addr,
			    int addr_len)
{
	struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
	struct sock *sk = sock->sk;
	int i;

	BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid,
	       sa->iso_bc->bc_num_bis);

	if (addr_len > sizeof(*sa) + sizeof(*sa->iso_bc) ||
	    sa->iso_bc->bc_num_bis < 0x01 || sa->iso_bc->bc_num_bis > 0x1f)
		return -EINVAL;

	bacpy(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr);
	iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
	iso_pi(sk)->sync_handle = -1;
	iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
	iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;

	for (i = 0; i < iso_pi(sk)->bc_num_bis; i++) {
		if (sa->iso_bc->bc_bis[i] < 0x01 ||
		    sa->iso_bc->bc_bis[i] > 0x1f)
			return -EINVAL;

		memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
		       iso_pi(sk)->bc_num_bis);
	}

	return 0;
}

static int iso_sock_bind(struct socket *sock, struct sockaddr *addr,
			 int addr_len)
{
	struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
	struct sock *sk = sock->sk;
	int err = 0;

	BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type);

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

	lock_sock(sk);

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

	if (sk->sk_type != SOCK_SEQPACKET) {
		err = -EINVAL;
		goto done;
	}

	/* Check if the address type is of LE type */
	if (!bdaddr_type_is_le(sa->iso_bdaddr_type)) {
		err = -EINVAL;
		goto done;
	}

	bacpy(&iso_pi(sk)->src, &sa->iso_bdaddr);
	iso_pi(sk)->src_type = sa->iso_bdaddr_type;

	/* Check for Broadcast address */
	if (addr_len > sizeof(*sa)) {
		err = iso_sock_bind_bc(sock, addr, addr_len);
		if (err)
			goto done;
	}

	sk->sk_state = BT_BOUND;

done:
	release_sock(sk);
	return err;
}

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

	BT_DBG("sk %p", sk);

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

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

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

	/* Check if the address type is of LE type */
	if (!bdaddr_type_is_le(sa->iso_bdaddr_type))
		return -EINVAL;

	lock_sock(sk);

	bacpy(&iso_pi(sk)->dst, &sa->iso_bdaddr);
	iso_pi(sk)->dst_type = sa->iso_bdaddr_type;

	release_sock(sk);

	if (bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
		err = iso_connect_cis(sk);
	else
		err = iso_connect_bis(sk);

	if (err)
		return err;

	lock_sock(sk);

	if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
		err = bt_sock_wait_state(sk, BT_CONNECTED,
					 sock_sndtimeo(sk, flags & O_NONBLOCK));
	}

	release_sock(sk);
	return err;
}

static int iso_listen_bis(struct sock *sk)
{
	struct hci_dev *hdev;
	int err = 0;

	BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &iso_pi(sk)->src,
	       &iso_pi(sk)->dst, iso_pi(sk)->bc_sid);

	write_lock(&iso_sk_list.lock);

	if (__iso_get_sock_listen_by_sid(&iso_pi(sk)->src, &iso_pi(sk)->dst,
					 iso_pi(sk)->bc_sid))
		err = -EADDRINUSE;

	write_unlock(&iso_sk_list.lock);

	if (err)
		return err;

	hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
			     iso_pi(sk)->src_type);
	if (!hdev)
		return -EHOSTUNREACH;

	hci_dev_lock(hdev);

	err = hci_pa_create_sync(hdev, &iso_pi(sk)->dst,
				 le_addr_type(iso_pi(sk)->dst_type),
				 iso_pi(sk)->bc_sid);

	hci_dev_unlock(hdev);
	hci_dev_put(hdev);

	return err;
}

static int iso_listen_cis(struct sock *sk)
{
	int err = 0;

	BT_DBG("%pMR", &iso_pi(sk)->src);

	write_lock(&iso_sk_list.lock);

	if (__iso_get_sock_listen_by_addr(&iso_pi(sk)->src))
		err = -EADDRINUSE;

	write_unlock(&iso_sk_list.lock);

	return err;
}

static int iso_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) {
		err = -EBADFD;
		goto done;
	}

	if (sk->sk_type != SOCK_SEQPACKET) {
		err = -EINVAL;
		goto done;
	}

	if (!bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
		err = iso_listen_cis(sk);
	else
		err = iso_listen_bis(sk);

	if (err)
		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 iso_sock_accept(struct socket *sock, struct socket *newsock,
			   int flags, bool kern)
{
	DEFINE_WAIT_FUNC(wait, woken_wake_function);
	struct sock *sk = sock->sk, *ch;
	long timeo;
	int err = 0;

	lock_sock(sk);

	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_sleep(sk), &wait);
	while (1) {
		if (sk->sk_state != BT_LISTEN) {
			err = -EBADFD;
			break;
		}

		ch = bt_accept_dequeue(sk, newsock);
		if (ch)
			break;

		if (!timeo) {
			err = -EAGAIN;
			break;
		}

		if (signal_pending(current)) {
			err = sock_intr_errno(timeo);
			break;
		}

		release_sock(sk);

		timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
		lock_sock(sk);
	}
	remove_wait_queue(sk_sleep(sk), &wait);

	if (err)
		goto done;

	newsock->state = SS_CONNECTED;

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

done:
	release_sock(sk);
	return err;
}

static int iso_sock_getname(struct socket *sock, struct sockaddr *addr,
			    int peer)
{
	struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
	struct sock *sk = sock->sk;

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

	addr->sa_family = AF_BLUETOOTH;

	if (peer) {
		bacpy(&sa->iso_bdaddr, &iso_pi(sk)->dst);
		sa->iso_bdaddr_type = iso_pi(sk)->dst_type;
	} else {
		bacpy(&sa->iso_bdaddr, &iso_pi(sk)->src);
		sa->iso_bdaddr_type = iso_pi(sk)->src_type;
	}

	return sizeof(struct sockaddr_iso);
}

static int iso_sock_sendmsg(struct socket *sock, struct msghdr *msg,
			    size_t len)
{
	struct sock *sk = sock->sk;
	struct iso_conn *conn = iso_pi(sk)->conn;
	struct sk_buff *skb, **frag;
	int err;

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

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

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

	if (sk->sk_state != BT_CONNECTED)
		return -ENOTCONN;

	skb = bt_skb_sendmsg(sk, msg, len, conn->hcon->hdev->iso_mtu,
			     HCI_ISO_DATA_HDR_SIZE, 0);
	if (IS_ERR(skb))
		return PTR_ERR(skb);

	len -= skb->len;

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

	/* Continuation fragments */
	frag = &skb_shinfo(skb)->frag_list;
	while (len) {
		struct sk_buff *tmp;

		tmp = bt_skb_sendmsg(sk, msg, len, conn->hcon->hdev->iso_mtu,
				     0, 0);
		if (IS_ERR(tmp)) {
			kfree_skb(skb);
			return PTR_ERR(tmp);
		}

		*frag = tmp;

		len  -= tmp->len;

		skb->len += tmp->len;
		skb->data_len += tmp->len;

		BT_DBG("frag %p len %d", *frag, tmp->len);

		frag = &(*frag)->next;
	}

	lock_sock(sk);

	if (sk->sk_state == BT_CONNECTED)
		err = iso_send_frame(sk, skb);
	else
		err = -ENOTCONN;

	release_sock(sk);

	if (err < 0)
		kfree_skb(skb);
	return err;
}

static void iso_conn_defer_accept(struct hci_conn *conn)
{
	struct hci_cp_le_accept_cis cp;
	struct hci_dev *hdev = conn->hdev;

	BT_DBG("conn %p", conn);

	conn->state = BT_CONFIG;

	cp.handle = cpu_to_le16(conn->handle);

	hci_send_cmd(hdev, HCI_OP_LE_ACCEPT_CIS, sizeof(cp), &cp);
}

static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
			    size_t len, int flags)
{
	struct sock *sk = sock->sk;
	struct iso_pinfo *pi = iso_pi(sk);

	BT_DBG("sk %p", sk);

	if (test_and_clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
		switch (sk->sk_state) {
		case BT_CONNECT2:
			lock_sock(sk);
			iso_conn_defer_accept(pi->conn->hcon);
			sk->sk_state = BT_CONFIG;
			release_sock(sk);
			return 0;
		case BT_CONNECT:
			return iso_connect_cis(sk);
		}
	}

	return bt_sock_recvmsg(sock, msg, len, flags);
}

static bool check_io_qos(struct bt_iso_io_qos *qos)
{
	/* If no PHY is enable SDU must be 0 */
	if (!qos->phy && qos->sdu)
		return false;

	if (qos->interval && (qos->interval < 0xff || qos->interval > 0xfffff))
		return false;

	if (qos->latency && (qos->latency < 0x05 || qos->latency > 0xfa0))
		return false;

	if (qos->phy > BT_ISO_PHY_ANY)
		return false;

	return true;
}

static bool check_qos(struct bt_iso_qos *qos)
{
	if (qos->sca > 0x07)
		return false;

	if (qos->packing > 0x01)
		return false;

	if (qos->framing > 0x01)
		return false;

	if (!check_io_qos(&qos->in))
		return false;

	if (!check_io_qos(&qos->out))
		return false;

	return true;
}

static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
			       sockptr_t optval, unsigned int optlen)
{
	struct sock *sk = sock->sk;
	int len, err = 0;
	struct bt_iso_qos qos;
	u32 opt;

	BT_DBG("sk %p", sk);

	lock_sock(sk);

	switch (optname) {
	case BT_DEFER_SETUP:
		if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
			err = -EINVAL;
			break;
		}

		if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
			err = -EFAULT;
			break;
		}

		if (opt)
			set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
		else
			clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
		break;

	case BT_ISO_QOS:
		if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
		    sk->sk_state != BT_CONNECT2) {
			err = -EINVAL;
			break;
		}

		len = min_t(unsigned int, sizeof(qos), optlen);
		if (len != sizeof(qos)) {
			err = -EINVAL;
			break;
		}

		memset(&qos, 0, sizeof(qos));

		if (copy_from_sockptr(&qos, optval, len)) {
			err = -EFAULT;
			break;
		}

		if (!check_qos(&qos)) {
			err = -EINVAL;
			break;
		}

		iso_pi(sk)->qos = qos;

		break;

	case BT_ISO_BASE:
		if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
		    sk->sk_state != BT_CONNECT2) {
			err = -EINVAL;
			break;
		}

		if (optlen > sizeof(iso_pi(sk)->base)) {
			err = -EOVERFLOW;
			break;
		}

		len = min_t(unsigned int, sizeof(iso_pi(sk)->base), optlen);

		if (copy_from_sockptr(iso_pi(sk)->base, optval, len)) {
			err = -EFAULT;
			break;
		}

		iso_pi(sk)->base_len = len;

		break;

	default:
		err = -ENOPROTOOPT;
		break;
	}

	release_sock(sk);
	return err;
}

static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
			       char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
	int len, err = 0;
	struct bt_iso_qos *qos;
	u8 base_len;
	u8 *base;

	BT_DBG("sk %p", sk);

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

	lock_sock(sk);

	switch (optname) {
	case BT_DEFER_SETUP:
		if (sk->sk_state == BT_CONNECTED) {
			err = -EINVAL;
			break;
		}

		if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
			     (u32 __user *)optval))
			err = -EFAULT;

		break;

	case BT_ISO_QOS:
		qos = iso_sock_get_qos(sk);

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

		break;

	case BT_ISO_BASE:
		if (sk->sk_state == BT_CONNECTED) {
			base_len = iso_pi(sk)->conn->hcon->le_per_adv_data_len;
			base = iso_pi(sk)->conn->hcon->le_per_adv_data;
		} else {
			base_len = iso_pi(sk)->base_len;
			base = iso_pi(sk)->base;
		}

		len = min_t(unsigned int, len, base_len);
		if (copy_to_user(optval, base, len))
			err = -EFAULT;

		break;

	default:
		err = -ENOPROTOOPT;
		break;
	}

	release_sock(sk);
	return err;
}

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

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

	if (!sk)
		return 0;

	sock_hold(sk);
	lock_sock(sk);

	switch (how) {
	case SHUT_RD:
		if (sk->sk_shutdown & RCV_SHUTDOWN)
			goto unlock;
		sk->sk_shutdown |= RCV_SHUTDOWN;
		break;
	case SHUT_WR:
		if (sk->sk_shutdown & SEND_SHUTDOWN)
			goto unlock;
		sk->sk_shutdown |= SEND_SHUTDOWN;
		break;
	case SHUT_RDWR:
		if (sk->sk_shutdown & SHUTDOWN_MASK)
			goto unlock;
		sk->sk_shutdown |= SHUTDOWN_MASK;
		break;
	}

	iso_sock_clear_timer(sk);
	__iso_sock_close(sk);

	if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
	    !(current->flags & PF_EXITING))
		err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);

unlock:
	release_sock(sk);
	sock_put(sk);

	return err;
}

static int iso_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;

	iso_sock_close(sk);

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

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

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

	if (!sk)
		return;

	lock_sock(sk);
	iso_sock_clear_timer(sk);
	sk->sk_state = BT_CONNECTED;
	sk->sk_state_change(sk);
	release_sock(sk);
}

struct iso_list_data {
	struct hci_conn *hcon;
	int count;
};

static bool iso_match_big(struct sock *sk, void *data)
{
	struct hci_evt_le_big_sync_estabilished *ev = data;

	return ev->handle == iso_pi(sk)->qos.big;
}

static void iso_conn_ready(struct iso_conn *conn)
{
	struct sock *parent;
	struct sock *sk = conn->sk;
	struct hci_ev_le_big_sync_estabilished *ev;

	BT_DBG("conn %p", conn);

	if (sk) {
		iso_sock_ready(conn->sk);
	} else {
		iso_conn_lock(conn);

		if (!conn->hcon) {
			iso_conn_unlock(conn);
			return;
		}

		ev = hci_recv_event_data(conn->hcon->hdev,
					 HCI_EVT_LE_BIG_SYNC_ESTABILISHED);
		if (ev)
			parent = iso_get_sock_listen(&conn->hcon->src,
						     &conn->hcon->dst,
						     iso_match_big, ev);
		else
			parent = iso_get_sock_listen(&conn->hcon->src,
						     BDADDR_ANY, NULL, NULL);

		if (!parent) {
			iso_conn_unlock(conn);
			return;
		}

		lock_sock(parent);

		sk = iso_sock_alloc(sock_net(parent), NULL,
				    BTPROTO_ISO, GFP_ATOMIC, 0);
		if (!sk) {
			release_sock(parent);
			iso_conn_unlock(conn);
			return;
		}

		iso_sock_init(sk, parent);

		bacpy(&iso_pi(sk)->src, &conn->hcon->src);
		iso_pi(sk)->src_type = conn->hcon->src_type;

		/* If hcon has no destination address (BDADDR_ANY) it means it
		 * was created by HCI_EV_LE_BIG_SYNC_ESTABILISHED so we need to
		 * initialize using the parent socket destination address.
		 */
		if (!bacmp(&conn->hcon->dst, BDADDR_ANY)) {
			bacpy(&conn->hcon->dst, &iso_pi(parent)->dst);
			conn->hcon->dst_type = iso_pi(parent)->dst_type;
			conn->hcon->sync_handle = iso_pi(parent)->sync_handle;
		}

		bacpy(&iso_pi(sk)->dst, &conn->hcon->dst);
		iso_pi(sk)->dst_type = conn->hcon->dst_type;

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

		if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
			sk->sk_state = BT_CONNECT2;
		else
			sk->sk_state = BT_CONNECTED;

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

		release_sock(parent);

		iso_conn_unlock(conn);
	}
}

static bool iso_match_sid(struct sock *sk, void *data)
{
	struct hci_ev_le_pa_sync_established *ev = data;

	return ev->sid == iso_pi(sk)->bc_sid;
}

static bool iso_match_sync_handle(struct sock *sk, void *data)
{
	struct hci_evt_le_big_info_adv_report *ev = data;

	return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
}

/* ----- ISO interface with lower layer (HCI) ----- */

int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
{
	struct hci_ev_le_pa_sync_established *ev1;
	struct hci_evt_le_big_info_adv_report *ev2;
	struct sock *sk;
	int lm = 0;

	bt_dev_dbg(hdev, "bdaddr %pMR", bdaddr);

	/* Broadcast receiver requires handling of some events before it can
	 * proceed to establishing a BIG sync:
	 *
	 * 1. HCI_EV_LE_PA_SYNC_ESTABLISHED: The socket may specify a specific
	 * SID to listen to and once sync is estabilished its handle needs to
	 * be stored in iso_pi(sk)->sync_handle so it can be matched once
	 * receiving the BIG Info.
	 * 2. HCI_EVT_LE_BIG_INFO_ADV_REPORT: When connect_ind is triggered by a
	 * a BIG Info it attempts to check if there any listening socket with
	 * the same sync_handle and if it does then attempt to create a sync.
	 */
	ev1 = hci_recv_event_data(hdev, HCI_EV_LE_PA_SYNC_ESTABLISHED);
	if (ev1) {
		sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr, iso_match_sid,
					 ev1);
		if (sk)
			iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);

		goto done;
	}

	ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT);
	if (ev2) {
		sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr,
					 iso_match_sync_handle, ev2);
		if (sk) {
			int err;

			if (ev2->num_bis < iso_pi(sk)->bc_num_bis)
				iso_pi(sk)->bc_num_bis = ev2->num_bis;

			err = hci_le_big_create_sync(hdev,
						     &iso_pi(sk)->qos,
						     iso_pi(sk)->sync_handle,
						     iso_pi(sk)->bc_num_bis,
						     iso_pi(sk)->bc_bis);
			if (err) {
				bt_dev_err(hdev, "hci_le_big_create_sync: %d",
					   err);
				sk = NULL;
			}
		}
	} else {
		sk = iso_get_sock_listen(&hdev->bdaddr, BDADDR_ANY, NULL, NULL);
	}

done:
	if (!sk)
		return lm;

	lm |= HCI_LM_ACCEPT;

	if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
		*flags |= HCI_PROTO_DEFER;

	return lm;
}

static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
{
	if (hcon->type != ISO_LINK) {
		if (hcon->type != LE_LINK)
			return;

		/* Check if LE link has failed */
		if (status) {
			if (hcon->link)
				iso_conn_del(hcon->link, bt_to_errno(status));
			return;
		}

		/* Create CIS if pending */
		hci_le_create_cis(hcon);
		return;
	}

	BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);

	if (!status) {
		struct iso_conn *conn;

		conn = iso_conn_add(hcon);
		if (conn)
			iso_conn_ready(conn);
	} else {
		iso_conn_del(hcon, bt_to_errno(status));
	}
}

static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
{
	if (hcon->type != ISO_LINK)
		return;

	BT_DBG("hcon %p reason %d", hcon, reason);

	iso_conn_del(hcon, bt_to_errno(reason));
}

void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
{
	struct iso_conn *conn = hcon->iso_data;
	struct hci_iso_data_hdr *hdr;
	__u16 pb, ts, len;

	if (!conn)
		goto drop;

	pb     = hci_iso_flags_pb(flags);
	ts     = hci_iso_flags_ts(flags);

	BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);

	switch (pb) {
	case ISO_START:
	case ISO_SINGLE:
		if (conn->rx_len) {
			BT_ERR("Unexpected start frame (len %d)", skb->len);
			kfree_skb(conn->rx_skb);
			conn->rx_skb = NULL;
			conn->rx_len = 0;
		}

		if (ts) {
			/* TODO: add timestamp to the packet? */
			hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
			if (!hdr) {
				BT_ERR("Frame is too short (len %d)", skb->len);
				goto drop;
			}

		} else {
			hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
			if (!hdr) {
				BT_ERR("Frame is too short (len %d)", skb->len);
				goto drop;
			}
		}

		len    = __le16_to_cpu(hdr->slen);
		flags  = hci_iso_data_flags(len);
		len    = hci_iso_data_len(len);

		BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x", len,
		       skb->len, flags);

		if (len == skb->len) {
			/* Complete frame received */
			iso_recv_frame(conn, skb);
			return;
		}

		if (pb == ISO_SINGLE) {
			BT_ERR("Frame malformed (len %d, expected len %d)",
			       skb->len, len);
			goto drop;
		}

		if (skb->len > len) {
			BT_ERR("Frame is too long (len %d, expected len %d)",
			       skb->len, len);
			goto drop;
		}

		/* Allocate skb for the complete frame (with header) */
		conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
		if (!conn->rx_skb)
			goto drop;

		skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
					  skb->len);
		conn->rx_len = len - skb->len;
		break;

	case ISO_CONT:
		BT_DBG("Cont: frag len %d (expecting %d)", skb->len,
		       conn->rx_len);

		if (!conn->rx_len) {
			BT_ERR("Unexpected continuation frame (len %d)",
			       skb->len);
			goto drop;
		}

		if (skb->len > conn->rx_len) {
			BT_ERR("Fragment is too long (len %d, expected %d)",
			       skb->len, conn->rx_len);
			kfree_skb(conn->rx_skb);
			conn->rx_skb = NULL;
			conn->rx_len = 0;
			goto drop;
		}

		skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
					  skb->len);
		conn->rx_len -= skb->len;
		return;

	case ISO_END:
		skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
					  skb->len);
		conn->rx_len -= skb->len;

		if (!conn->rx_len) {
			struct sk_buff *rx_skb = conn->rx_skb;

			/* Complete frame received. iso_recv_frame
			 * takes ownership of the skb so set the global
			 * rx_skb pointer to NULL first.
			 */
			conn->rx_skb = NULL;
			iso_recv_frame(conn, rx_skb);
		}
		break;
	}

drop:
	kfree_skb(skb);
}

static struct hci_cb iso_cb = {
	.name		= "ISO",
	.connect_cfm	= iso_connect_cfm,
	.disconn_cfm	= iso_disconn_cfm,
};

static int iso_debugfs_show(struct seq_file *f, void *p)
{
	struct sock *sk;

	read_lock(&iso_sk_list.lock);

	sk_for_each(sk, &iso_sk_list.head) {
		seq_printf(f, "%pMR %pMR %d\n", &iso_pi(sk)->src,
			   &iso_pi(sk)->dst, sk->sk_state);
	}

	read_unlock(&iso_sk_list.lock);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(iso_debugfs);

static struct dentry *iso_debugfs;

static const struct proto_ops iso_sock_ops = {
	.family		= PF_BLUETOOTH,
	.owner		= THIS_MODULE,
	.release	= iso_sock_release,
	.bind		= iso_sock_bind,
	.connect	= iso_sock_connect,
	.listen		= iso_sock_listen,
	.accept		= iso_sock_accept,
	.getname	= iso_sock_getname,
	.sendmsg	= iso_sock_sendmsg,
	.recvmsg	= iso_sock_recvmsg,
	.poll		= bt_sock_poll,
	.ioctl		= bt_sock_ioctl,
	.mmap		= sock_no_mmap,
	.socketpair	= sock_no_socketpair,
	.shutdown	= iso_sock_shutdown,
	.setsockopt	= iso_sock_setsockopt,
	.getsockopt	= iso_sock_getsockopt
};

static const struct net_proto_family iso_sock_family_ops = {
	.family	= PF_BLUETOOTH,
	.owner	= THIS_MODULE,
	.create	= iso_sock_create,
};

static bool iso_inited;

bool iso_enabled(void)
{
	return iso_inited;
}

int iso_init(void)
{
	int err;

	BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr));

	if (iso_inited)
		return -EALREADY;

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

	err = bt_sock_register(BTPROTO_ISO, &iso_sock_family_ops);
	if (err < 0) {
		BT_ERR("ISO socket registration failed");
		goto error;
	}

	err = bt_procfs_init(&init_net, "iso", &iso_sk_list, NULL);
	if (err < 0) {
		BT_ERR("Failed to create ISO proc file");
		bt_sock_unregister(BTPROTO_ISO);
		goto error;
	}

	BT_INFO("ISO socket layer initialized");

	hci_register_cb(&iso_cb);

	if (IS_ERR_OR_NULL(bt_debugfs))
		return 0;

	if (!iso_debugfs) {
		iso_debugfs = debugfs_create_file("iso", 0444, bt_debugfs,
						  NULL, &iso_debugfs_fops);
	}

	iso_inited = true;

	return 0;

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

int iso_exit(void)
{
	if (!iso_inited)
		return -EALREADY;

	bt_procfs_cleanup(&init_net, "iso");

	debugfs_remove(iso_debugfs);
	iso_debugfs = NULL;

	hci_unregister_cb(&iso_cb);

	bt_sock_unregister(BTPROTO_ISO);

	proto_unregister(&iso_proto);

	iso_inited = false;

	return 0;
}