1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * BlueZ - Bluetooth protocol stack for Linux
4 *
5 * Copyright (C) 2022 Intel Corporation
6 * Copyright 2023-2024 NXP
7 */
8
9 #include <linux/module.h>
10 #include <linux/debugfs.h>
11 #include <linux/seq_file.h>
12 #include <linux/sched/signal.h>
13
14 #include <net/bluetooth/bluetooth.h>
15 #include <net/bluetooth/hci_core.h>
16 #include <net/bluetooth/iso.h>
17 #include "eir.h"
18
19 static const struct proto_ops iso_sock_ops;
20
21 static struct bt_sock_list iso_sk_list = {
22 .lock = __RW_LOCK_UNLOCKED(iso_sk_list.lock)
23 };
24
25 /* ---- ISO connections ---- */
26 struct iso_conn {
27 struct hci_conn *hcon;
28
29 /* @lock: spinlock protecting changes to iso_conn fields */
30 spinlock_t lock;
31 struct sock *sk;
32
33 struct delayed_work timeout_work;
34
35 struct sk_buff *rx_skb;
36 __u32 rx_len;
37 __u16 tx_sn;
38 struct kref ref;
39 };
40
41 #define iso_conn_lock(c) spin_lock(&(c)->lock)
42 #define iso_conn_unlock(c) spin_unlock(&(c)->lock)
43
44 static void iso_sock_close(struct sock *sk);
45 static void iso_sock_kill(struct sock *sk);
46
47 /* ----- ISO socket info ----- */
48 #define iso_pi(sk) ((struct iso_pinfo *)sk)
49
50 #define EIR_SERVICE_DATA_LENGTH 4
51 #define BASE_MAX_LENGTH (HCI_MAX_PER_AD_LENGTH - EIR_SERVICE_DATA_LENGTH)
52 #define EIR_BAA_SERVICE_UUID 0x1851
53
54 /* iso_pinfo flags values */
55 enum {
56 BT_SK_BIG_SYNC,
57 BT_SK_PA_SYNC,
58 };
59
60 struct iso_pinfo {
61 struct bt_sock bt;
62 bdaddr_t src;
63 __u8 src_type;
64 bdaddr_t dst;
65 __u8 dst_type;
66 __u8 bc_sid;
67 __u8 bc_num_bis;
68 __u8 bc_bis[ISO_MAX_NUM_BIS];
69 __u16 sync_handle;
70 unsigned long flags;
71 struct bt_iso_qos qos;
72 bool qos_user_set;
73 __u8 base_len;
74 __u8 base[BASE_MAX_LENGTH];
75 struct iso_conn *conn;
76 };
77
78 static struct bt_iso_qos default_qos;
79
80 static bool check_ucast_qos(struct bt_iso_qos *qos);
81 static bool check_bcast_qos(struct bt_iso_qos *qos);
82 static bool iso_match_sid(struct sock *sk, void *data);
83 static bool iso_match_sid_past(struct sock *sk, void *data);
84 static bool iso_match_sync_handle(struct sock *sk, void *data);
85 static bool iso_match_sync_handle_pa_report(struct sock *sk, void *data);
86 static void iso_sock_disconn(struct sock *sk);
87
88 typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);
89
90 static struct sock *iso_get_sock(struct hci_dev *hdev, bdaddr_t *src,
91 bdaddr_t *dst, enum bt_sock_state state,
92 iso_sock_match_t match, void *data);
93
94 /* ---- ISO timers ---- */
95 #define ISO_CONN_TIMEOUT secs_to_jiffies(20)
96 #define ISO_DISCONN_TIMEOUT secs_to_jiffies(2)
97
iso_conn_free(struct kref * ref)98 static void iso_conn_free(struct kref *ref)
99 {
100 struct iso_conn *conn = container_of(ref, struct iso_conn, ref);
101
102 BT_DBG("conn %p", conn);
103
104 if (conn->sk)
105 iso_pi(conn->sk)->conn = NULL;
106
107 if (conn->hcon) {
108 conn->hcon->iso_data = NULL;
109 hci_conn_drop(conn->hcon);
110 }
111
112 /* Ensure no more work items will run since hci_conn has been dropped */
113 disable_delayed_work_sync(&conn->timeout_work);
114
115 kfree_skb(conn->rx_skb);
116
117 kfree(conn);
118 }
119
iso_conn_put(struct iso_conn * conn)120 static void iso_conn_put(struct iso_conn *conn)
121 {
122 if (!conn)
123 return;
124
125 BT_DBG("conn %p refcnt %d", conn, kref_read(&conn->ref));
126
127 kref_put(&conn->ref, iso_conn_free);
128 }
129
iso_conn_hold_unless_zero(struct iso_conn * conn)130 static struct iso_conn *iso_conn_hold_unless_zero(struct iso_conn *conn)
131 {
132 if (!conn)
133 return NULL;
134
135 BT_DBG("conn %p refcnt %u", conn, kref_read(&conn->ref));
136
137 if (!kref_get_unless_zero(&conn->ref))
138 return NULL;
139
140 return conn;
141 }
142
iso_sock_hold(struct iso_conn * conn)143 static struct sock *iso_sock_hold(struct iso_conn *conn)
144 {
145 if (!conn || !bt_sock_linked(&iso_sk_list, conn->sk))
146 return NULL;
147
148 sock_hold(conn->sk);
149
150 return conn->sk;
151 }
152
iso_sock_timeout(struct work_struct * work)153 static void iso_sock_timeout(struct work_struct *work)
154 {
155 struct iso_conn *conn = container_of(work, struct iso_conn,
156 timeout_work.work);
157 struct sock *sk;
158
159 conn = iso_conn_hold_unless_zero(conn);
160 if (!conn)
161 return;
162
163 iso_conn_lock(conn);
164 sk = iso_sock_hold(conn);
165 iso_conn_unlock(conn);
166 iso_conn_put(conn);
167
168 if (!sk)
169 return;
170
171 BT_DBG("sock %p state %d", sk, sk->sk_state);
172
173 lock_sock(sk);
174 sk->sk_err = ETIMEDOUT;
175 sk->sk_state_change(sk);
176 release_sock(sk);
177 sock_put(sk);
178 }
179
iso_sock_set_timer(struct sock * sk,long timeout)180 static void iso_sock_set_timer(struct sock *sk, long timeout)
181 {
182 if (!iso_pi(sk)->conn)
183 return;
184
185 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
186 cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
187 schedule_delayed_work(&iso_pi(sk)->conn->timeout_work, timeout);
188 }
189
iso_sock_clear_timer(struct sock * sk)190 static void iso_sock_clear_timer(struct sock *sk)
191 {
192 if (!iso_pi(sk)->conn)
193 return;
194
195 BT_DBG("sock %p state %d", sk, sk->sk_state);
196 cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
197 }
198
199 /* ---- ISO connections ---- */
iso_conn_add(struct hci_conn * hcon)200 static struct iso_conn *iso_conn_add(struct hci_conn *hcon)
201 {
202 struct iso_conn *conn = hcon->iso_data;
203
204 conn = iso_conn_hold_unless_zero(conn);
205 if (conn) {
206 if (!conn->hcon) {
207 iso_conn_lock(conn);
208 conn->hcon = hcon;
209 iso_conn_unlock(conn);
210 }
211 iso_conn_put(conn);
212 return conn;
213 }
214
215 conn = kzalloc_obj(*conn);
216 if (!conn)
217 return NULL;
218
219 kref_init(&conn->ref);
220 spin_lock_init(&conn->lock);
221 INIT_DELAYED_WORK(&conn->timeout_work, iso_sock_timeout);
222
223 hcon->iso_data = conn;
224 conn->hcon = hcon;
225 conn->tx_sn = 0;
226
227 BT_DBG("hcon %p conn %p", hcon, conn);
228
229 return conn;
230 }
231
232 /* Delete channel. Must be called on the locked socket. */
iso_chan_del(struct sock * sk,int err)233 static void iso_chan_del(struct sock *sk, int err)
234 {
235 struct iso_conn *conn;
236 struct sock *parent;
237
238 conn = iso_pi(sk)->conn;
239 iso_pi(sk)->conn = NULL;
240
241 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
242
243 if (conn) {
244 iso_conn_lock(conn);
245 conn->sk = NULL;
246 iso_conn_unlock(conn);
247 iso_conn_put(conn);
248 }
249
250 sk->sk_state = BT_CLOSED;
251 sk->sk_err = err;
252
253 parent = bt_sk(sk)->parent;
254 if (parent) {
255 bt_accept_unlink(sk);
256 parent->sk_data_ready(parent);
257 } else {
258 sk->sk_state_change(sk);
259 }
260
261 sock_set_flag(sk, SOCK_ZAPPED);
262 }
263
iso_conn_del(struct hci_conn * hcon,int err)264 static void iso_conn_del(struct hci_conn *hcon, int err)
265 {
266 struct iso_conn *conn = hcon->iso_data;
267 struct sock *sk;
268
269 conn = iso_conn_hold_unless_zero(conn);
270 if (!conn)
271 return;
272
273 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
274
275 /* Kill socket */
276 iso_conn_lock(conn);
277 sk = iso_sock_hold(conn);
278 iso_conn_unlock(conn);
279 iso_conn_put(conn);
280
281 if (!sk) {
282 iso_conn_put(conn);
283 return;
284 }
285
286 lock_sock(sk);
287 iso_sock_clear_timer(sk);
288 iso_chan_del(sk, err);
289 release_sock(sk);
290 sock_put(sk);
291 }
292
__iso_chan_add(struct iso_conn * conn,struct sock * sk,struct sock * parent)293 static int __iso_chan_add(struct iso_conn *conn, struct sock *sk,
294 struct sock *parent)
295 {
296 BT_DBG("conn %p", conn);
297
298 if (iso_pi(sk)->conn == conn && conn->sk == sk)
299 return 0;
300
301 if (conn->sk) {
302 BT_ERR("conn->sk already set");
303 return -EBUSY;
304 }
305
306 iso_pi(sk)->conn = conn;
307 conn->sk = sk;
308
309 if (parent)
310 bt_accept_enqueue(parent, sk, true);
311
312 return 0;
313 }
314
iso_chan_add(struct iso_conn * conn,struct sock * sk,struct sock * parent)315 static int iso_chan_add(struct iso_conn *conn, struct sock *sk,
316 struct sock *parent)
317 {
318 int err;
319
320 iso_conn_lock(conn);
321 err = __iso_chan_add(conn, sk, parent);
322 iso_conn_unlock(conn);
323
324 return err;
325 }
326
le_addr_type(u8 bdaddr_type)327 static inline u8 le_addr_type(u8 bdaddr_type)
328 {
329 if (bdaddr_type == BDADDR_LE_PUBLIC)
330 return ADDR_LE_DEV_PUBLIC;
331 else
332 return ADDR_LE_DEV_RANDOM;
333 }
334
iso_connect_bis(struct sock * sk)335 static int iso_connect_bis(struct sock *sk)
336 {
337 struct iso_conn *conn;
338 struct hci_conn *hcon;
339 struct hci_dev *hdev;
340 int err;
341
342 BT_DBG("%pMR (SID 0x%2.2x)", &iso_pi(sk)->src, iso_pi(sk)->bc_sid);
343
344 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
345 iso_pi(sk)->src_type);
346 if (!hdev)
347 return -EHOSTUNREACH;
348
349 hci_dev_lock(hdev);
350
351 if (!bis_capable(hdev)) {
352 err = -EOPNOTSUPP;
353 goto unlock;
354 }
355
356 /* Fail if user set invalid QoS */
357 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(&iso_pi(sk)->qos)) {
358 iso_pi(sk)->qos = default_qos;
359 err = -EINVAL;
360 goto unlock;
361 }
362
363 /* Fail if out PHYs are marked as disabled */
364 if (!iso_pi(sk)->qos.bcast.out.phys) {
365 err = -EINVAL;
366 goto unlock;
367 }
368
369 /* Just bind if DEFER_SETUP has been set */
370 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
371 hcon = hci_bind_bis(hdev, &iso_pi(sk)->dst, iso_pi(sk)->bc_sid,
372 &iso_pi(sk)->qos, iso_pi(sk)->base_len,
373 iso_pi(sk)->base,
374 READ_ONCE(sk->sk_sndtimeo));
375 if (IS_ERR(hcon)) {
376 err = PTR_ERR(hcon);
377 goto unlock;
378 }
379 } else {
380 hcon = hci_connect_bis(hdev, &iso_pi(sk)->dst,
381 le_addr_type(iso_pi(sk)->dst_type),
382 iso_pi(sk)->bc_sid, &iso_pi(sk)->qos,
383 iso_pi(sk)->base_len, iso_pi(sk)->base,
384 READ_ONCE(sk->sk_sndtimeo));
385 if (IS_ERR(hcon)) {
386 err = PTR_ERR(hcon);
387 goto unlock;
388 }
389
390 /* Update SID if it was not set */
391 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID)
392 iso_pi(sk)->bc_sid = hcon->sid;
393 }
394
395 conn = iso_conn_add(hcon);
396 if (!conn) {
397 hci_conn_drop(hcon);
398 err = -ENOMEM;
399 goto unlock;
400 }
401
402 lock_sock(sk);
403
404 err = iso_chan_add(conn, sk, NULL);
405 if (err) {
406 release_sock(sk);
407 goto unlock;
408 }
409
410 /* Update source addr of the socket */
411 bacpy(&iso_pi(sk)->src, &hcon->src);
412
413 if (hcon->state == BT_CONNECTED) {
414 iso_sock_clear_timer(sk);
415 sk->sk_state = BT_CONNECTED;
416 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
417 iso_sock_clear_timer(sk);
418 sk->sk_state = BT_CONNECT;
419 } else {
420 sk->sk_state = BT_CONNECT;
421 iso_sock_set_timer(sk, READ_ONCE(sk->sk_sndtimeo));
422 }
423
424 release_sock(sk);
425
426 unlock:
427 hci_dev_unlock(hdev);
428 hci_dev_put(hdev);
429 return err;
430 }
431
iso_connect_cis(struct sock * sk)432 static int iso_connect_cis(struct sock *sk)
433 {
434 struct iso_conn *conn;
435 struct hci_conn *hcon;
436 struct hci_dev *hdev;
437 int err;
438
439 BT_DBG("%pMR -> %pMR", &iso_pi(sk)->src, &iso_pi(sk)->dst);
440
441 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
442 iso_pi(sk)->src_type);
443 if (!hdev)
444 return -EHOSTUNREACH;
445
446 hci_dev_lock(hdev);
447
448 if (!cis_central_capable(hdev)) {
449 err = -EOPNOTSUPP;
450 goto unlock;
451 }
452
453 /* Fail if user set invalid QoS */
454 if (iso_pi(sk)->qos_user_set && !check_ucast_qos(&iso_pi(sk)->qos)) {
455 iso_pi(sk)->qos = default_qos;
456 err = -EINVAL;
457 goto unlock;
458 }
459
460 /* Fail if either PHYs are marked as disabled */
461 if (!iso_pi(sk)->qos.ucast.in.phys && !iso_pi(sk)->qos.ucast.out.phys) {
462 err = -EINVAL;
463 goto unlock;
464 }
465
466 /* Check if there are available buffers for output/TX. */
467 if (iso_pi(sk)->qos.ucast.out.sdu && !hci_iso_count(hdev) &&
468 (hdev->iso_pkts && !hdev->iso_cnt)) {
469 err = -ENOBUFS;
470 goto unlock;
471 }
472
473 /* Just bind if DEFER_SETUP has been set */
474 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
475 hcon = hci_bind_cis(hdev, &iso_pi(sk)->dst,
476 le_addr_type(iso_pi(sk)->dst_type),
477 &iso_pi(sk)->qos,
478 READ_ONCE(sk->sk_sndtimeo));
479 if (IS_ERR(hcon)) {
480 err = PTR_ERR(hcon);
481 goto unlock;
482 }
483 } else {
484 hcon = hci_connect_cis(hdev, &iso_pi(sk)->dst,
485 le_addr_type(iso_pi(sk)->dst_type),
486 &iso_pi(sk)->qos,
487 READ_ONCE(sk->sk_sndtimeo));
488 if (IS_ERR(hcon)) {
489 err = PTR_ERR(hcon);
490 goto unlock;
491 }
492 }
493
494 conn = iso_conn_add(hcon);
495 if (!conn) {
496 hci_conn_drop(hcon);
497 err = -ENOMEM;
498 goto unlock;
499 }
500
501 lock_sock(sk);
502
503 err = iso_chan_add(conn, sk, NULL);
504 if (err) {
505 release_sock(sk);
506 goto unlock;
507 }
508
509 /* Update source addr of the socket */
510 bacpy(&iso_pi(sk)->src, &hcon->src);
511
512 if (hcon->state == BT_CONNECTED) {
513 iso_sock_clear_timer(sk);
514 sk->sk_state = BT_CONNECTED;
515 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
516 iso_sock_clear_timer(sk);
517 sk->sk_state = BT_CONNECT;
518 } else {
519 sk->sk_state = BT_CONNECT;
520 iso_sock_set_timer(sk, READ_ONCE(sk->sk_sndtimeo));
521 }
522
523 release_sock(sk);
524
525 unlock:
526 hci_dev_unlock(hdev);
527 hci_dev_put(hdev);
528 return err;
529 }
530
iso_sock_get_qos(struct sock * sk)531 static struct bt_iso_qos *iso_sock_get_qos(struct sock *sk)
532 {
533 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
534 return &iso_pi(sk)->conn->hcon->iso_qos;
535
536 return &iso_pi(sk)->qos;
537 }
538
iso_send_frame(struct sock * sk,struct sk_buff * skb,const struct sockcm_cookie * sockc)539 static int iso_send_frame(struct sock *sk, struct sk_buff *skb,
540 const struct sockcm_cookie *sockc)
541 {
542 struct iso_conn *conn = iso_pi(sk)->conn;
543 struct bt_iso_qos *qos = iso_sock_get_qos(sk);
544 struct hci_iso_data_hdr *hdr;
545 int len = 0;
546
547 BT_DBG("sk %p len %d", sk, skb->len);
548
549 if (skb->len > qos->ucast.out.sdu)
550 return -EMSGSIZE;
551
552 len = skb->len;
553
554 /* Push ISO data header */
555 hdr = skb_push(skb, HCI_ISO_DATA_HDR_SIZE);
556 hdr->sn = cpu_to_le16(conn->tx_sn++);
557 hdr->slen = cpu_to_le16(hci_iso_data_len_pack(len,
558 HCI_ISO_STATUS_VALID));
559
560 if (sk->sk_state == BT_CONNECTED) {
561 hci_setup_tx_timestamp(skb, 1, sockc);
562 hci_send_iso(conn->hcon, skb);
563 } else {
564 len = -ENOTCONN;
565 }
566
567 return len;
568 }
569
iso_recv_frame(struct iso_conn * conn,struct sk_buff * skb)570 static void iso_recv_frame(struct iso_conn *conn, struct sk_buff *skb)
571 {
572 struct sock *sk;
573
574 iso_conn_lock(conn);
575 sk = conn->sk;
576 iso_conn_unlock(conn);
577
578 if (!sk)
579 goto drop;
580
581 BT_DBG("sk %p len %d", sk, skb->len);
582
583 if (sk->sk_state != BT_CONNECTED)
584 goto drop;
585
586 if (!sock_queue_rcv_skb(sk, skb))
587 return;
588
589 drop:
590 kfree_skb(skb);
591 }
592
593 /* -------- Socket interface ---------- */
__iso_get_sock_listen_by_addr(bdaddr_t * src,bdaddr_t * dst)594 static struct sock *__iso_get_sock_listen_by_addr(bdaddr_t *src, bdaddr_t *dst)
595 {
596 struct sock *sk;
597
598 sk_for_each(sk, &iso_sk_list.head) {
599 if (sk->sk_state != BT_LISTEN)
600 continue;
601
602 if (bacmp(&iso_pi(sk)->dst, dst))
603 continue;
604
605 if (!bacmp(&iso_pi(sk)->src, src))
606 return sk;
607 }
608
609 return NULL;
610 }
611
__iso_get_sock_listen_by_sid(bdaddr_t * ba,bdaddr_t * bc,__u8 sid)612 static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
613 __u8 sid)
614 {
615 struct sock *sk;
616
617 sk_for_each(sk, &iso_sk_list.head) {
618 if (sk->sk_state != BT_LISTEN)
619 continue;
620
621 if (bacmp(&iso_pi(sk)->src, ba))
622 continue;
623
624 if (bacmp(&iso_pi(sk)->dst, bc))
625 continue;
626
627 if (iso_pi(sk)->bc_sid == sid)
628 return sk;
629 }
630
631 return NULL;
632 }
633
634 /* Find socket in given state:
635 * source bdaddr (Unicast)
636 * destination bdaddr (Broadcast only)
637 * match func - pass NULL to ignore
638 * match func data - pass -1 to ignore
639 * Returns closest match.
640 */
iso_get_sock(struct hci_dev * hdev,bdaddr_t * src,bdaddr_t * dst,enum bt_sock_state state,iso_sock_match_t match,void * data)641 static struct sock *iso_get_sock(struct hci_dev *hdev, bdaddr_t *src,
642 bdaddr_t *dst, enum bt_sock_state state,
643 iso_sock_match_t match, void *data)
644 {
645 struct sock *sk = NULL, *sk1 = NULL;
646
647 read_lock(&iso_sk_list.lock);
648
649 sk_for_each(sk, &iso_sk_list.head) {
650 if (sk->sk_state != state)
651 continue;
652
653 /* Match Broadcast destination */
654 if (bacmp(dst, BDADDR_ANY) && bacmp(&iso_pi(sk)->dst, dst)) {
655 struct smp_irk *irk1, *irk2;
656
657 /* Check if destination is an RPA that we can resolve */
658 irk1 = hci_find_irk_by_rpa(hdev, dst);
659 if (!irk1)
660 continue;
661
662 /* Match with identity address */
663 if (bacmp(&iso_pi(sk)->dst, &irk1->bdaddr)) {
664 /* Check if socket destination address is also
665 * an RPA and if the IRK matches.
666 */
667 irk2 = hci_find_irk_by_rpa(hdev,
668 &iso_pi(sk)->dst);
669 if (!irk2 || irk1 != irk2)
670 continue;
671 }
672 }
673
674 /* Use Match function if provided */
675 if (match && !match(sk, data))
676 continue;
677
678 /* Exact match. */
679 if (!bacmp(&iso_pi(sk)->src, src)) {
680 sock_hold(sk);
681 break;
682 }
683
684 /* Closest match */
685 if (!bacmp(&iso_pi(sk)->src, BDADDR_ANY)) {
686 if (sk1)
687 sock_put(sk1);
688
689 sk1 = sk;
690 sock_hold(sk1);
691 }
692 }
693
694 if (sk && sk1)
695 sock_put(sk1);
696
697 read_unlock(&iso_sk_list.lock);
698
699 return sk ? sk : sk1;
700 }
701
iso_get_sock_big(struct sock * match_sk,bdaddr_t * src,bdaddr_t * dst,uint8_t big)702 static struct sock *iso_get_sock_big(struct sock *match_sk, bdaddr_t *src,
703 bdaddr_t *dst, uint8_t big)
704 {
705 struct sock *sk = NULL;
706
707 read_lock(&iso_sk_list.lock);
708
709 sk_for_each(sk, &iso_sk_list.head) {
710 if (match_sk == sk)
711 continue;
712
713 /* Look for sockets that have already been
714 * connected to the BIG
715 */
716 if (sk->sk_state != BT_CONNECTED &&
717 sk->sk_state != BT_CONNECT)
718 continue;
719
720 /* Match Broadcast destination */
721 if (bacmp(&iso_pi(sk)->dst, dst))
722 continue;
723
724 /* Match BIG handle */
725 if (iso_pi(sk)->qos.bcast.big != big)
726 continue;
727
728 /* Match source address */
729 if (bacmp(&iso_pi(sk)->src, src))
730 continue;
731
732 sock_hold(sk);
733 break;
734 }
735
736 read_unlock(&iso_sk_list.lock);
737
738 return sk;
739 }
740
iso_sock_destruct(struct sock * sk)741 static void iso_sock_destruct(struct sock *sk)
742 {
743 BT_DBG("sk %p", sk);
744
745 iso_conn_put(iso_pi(sk)->conn);
746
747 skb_queue_purge(&sk->sk_receive_queue);
748 skb_queue_purge(&sk->sk_write_queue);
749 skb_queue_purge(&sk->sk_error_queue);
750 }
751
iso_sock_cleanup_listen(struct sock * parent)752 static void iso_sock_cleanup_listen(struct sock *parent)
753 {
754 struct sock *sk;
755
756 BT_DBG("parent %p", parent);
757
758 /* Close not yet accepted channels */
759 while ((sk = bt_accept_dequeue(parent, NULL))) {
760 iso_sock_close(sk);
761 iso_sock_kill(sk);
762 }
763
764 /* If listening socket has a hcon, properly disconnect it */
765 if (iso_pi(parent)->conn && iso_pi(parent)->conn->hcon) {
766 iso_sock_disconn(parent);
767 return;
768 }
769
770 parent->sk_state = BT_CLOSED;
771 sock_set_flag(parent, SOCK_ZAPPED);
772 }
773
774 /* Kill socket (only if zapped and orphan)
775 * Must be called on unlocked socket.
776 */
iso_sock_kill(struct sock * sk)777 static void iso_sock_kill(struct sock *sk)
778 {
779 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||
780 sock_flag(sk, SOCK_DEAD))
781 return;
782
783 BT_DBG("sk %p state %d", sk, sk->sk_state);
784
785 /* Sock is dead, so set conn->sk to NULL to avoid possible UAF */
786 if (iso_pi(sk)->conn) {
787 iso_conn_lock(iso_pi(sk)->conn);
788 iso_pi(sk)->conn->sk = NULL;
789 iso_conn_unlock(iso_pi(sk)->conn);
790 }
791
792 /* Kill poor orphan */
793 bt_sock_unlink(&iso_sk_list, sk);
794 sock_set_flag(sk, SOCK_DEAD);
795 sock_put(sk);
796 }
797
iso_sock_disconn(struct sock * sk)798 static void iso_sock_disconn(struct sock *sk)
799 {
800 struct sock *bis_sk;
801 struct hci_conn *hcon = iso_pi(sk)->conn->hcon;
802
803 if (test_bit(HCI_CONN_BIG_CREATED, &hcon->flags)) {
804 bis_sk = iso_get_sock_big(sk, &iso_pi(sk)->src,
805 &iso_pi(sk)->dst,
806 iso_pi(sk)->qos.bcast.big);
807
808 /* If there are any other connected sockets for the
809 * same BIG, just delete the sk and leave the bis
810 * hcon active, in case later rebinding is needed.
811 */
812 if (bis_sk) {
813 hcon->state = BT_OPEN;
814 hcon->iso_data = NULL;
815 iso_pi(sk)->conn->hcon = NULL;
816 iso_sock_clear_timer(sk);
817 iso_chan_del(sk, bt_to_errno(hcon->abort_reason));
818 sock_put(bis_sk);
819 return;
820 }
821 }
822
823 sk->sk_state = BT_DISCONN;
824 iso_conn_lock(iso_pi(sk)->conn);
825 hci_conn_drop(iso_pi(sk)->conn->hcon);
826 iso_pi(sk)->conn->hcon = NULL;
827 iso_conn_unlock(iso_pi(sk)->conn);
828 }
829
__iso_sock_close(struct sock * sk)830 static void __iso_sock_close(struct sock *sk)
831 {
832 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
833
834 switch (sk->sk_state) {
835 case BT_LISTEN:
836 iso_sock_cleanup_listen(sk);
837 break;
838
839 case BT_CONNECT:
840 case BT_CONNECTED:
841 case BT_CONFIG:
842 if (iso_pi(sk)->conn->hcon)
843 iso_sock_disconn(sk);
844 else
845 iso_chan_del(sk, ECONNRESET);
846 break;
847
848 case BT_CONNECT2:
849 if (iso_pi(sk)->conn->hcon &&
850 (test_bit(HCI_CONN_PA_SYNC, &iso_pi(sk)->conn->hcon->flags) ||
851 test_bit(HCI_CONN_PA_SYNC_FAILED, &iso_pi(sk)->conn->hcon->flags)))
852 iso_sock_disconn(sk);
853 else
854 iso_chan_del(sk, ECONNRESET);
855 break;
856 case BT_DISCONN:
857 iso_chan_del(sk, ECONNRESET);
858 break;
859
860 default:
861 sock_set_flag(sk, SOCK_ZAPPED);
862 break;
863 }
864 }
865
866 /* Must be called on unlocked socket. */
iso_sock_close(struct sock * sk)867 static void iso_sock_close(struct sock *sk)
868 {
869 iso_sock_clear_timer(sk);
870 lock_sock(sk);
871 __iso_sock_close(sk);
872 release_sock(sk);
873 iso_sock_kill(sk);
874 }
875
iso_sock_init(struct sock * sk,struct sock * parent)876 static void iso_sock_init(struct sock *sk, struct sock *parent)
877 {
878 BT_DBG("sk %p", sk);
879
880 if (parent) {
881 sk->sk_type = parent->sk_type;
882 bt_sk(sk)->flags = bt_sk(parent)->flags;
883 security_sk_clone(parent, sk);
884 }
885 }
886
887 static struct proto iso_proto = {
888 .name = "ISO",
889 .owner = THIS_MODULE,
890 .obj_size = sizeof(struct iso_pinfo)
891 };
892
893 #define DEFAULT_IO_QOS \
894 { \
895 .interval = 10000u, \
896 .latency = 10u, \
897 .sdu = 40u, \
898 .phys = BT_ISO_PHY_2M, \
899 .rtn = 2u, \
900 }
901
902 static struct bt_iso_qos default_qos = {
903 .bcast = {
904 .big = BT_ISO_QOS_BIG_UNSET,
905 .bis = BT_ISO_QOS_BIS_UNSET,
906 .sync_factor = 0x01,
907 .packing = 0x00,
908 .framing = 0x00,
909 .in = DEFAULT_IO_QOS,
910 .out = DEFAULT_IO_QOS,
911 .encryption = 0x00,
912 .bcode = {0x00},
913 .options = 0x00,
914 .skip = 0x0000,
915 .sync_timeout = BT_ISO_SYNC_TIMEOUT,
916 .sync_cte_type = 0x00,
917 .mse = 0x00,
918 .timeout = BT_ISO_SYNC_TIMEOUT,
919 },
920 };
921
iso_sock_alloc(struct net * net,struct socket * sock,int proto,gfp_t prio,int kern)922 static struct sock *iso_sock_alloc(struct net *net, struct socket *sock,
923 int proto, gfp_t prio, int kern)
924 {
925 struct sock *sk;
926
927 sk = bt_sock_alloc(net, sock, &iso_proto, proto, prio, kern);
928 if (!sk)
929 return NULL;
930
931 sk->sk_destruct = iso_sock_destruct;
932 sk->sk_sndtimeo = ISO_CONN_TIMEOUT;
933
934 /* Set address type as public as default src address is BDADDR_ANY */
935 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
936
937 iso_pi(sk)->qos = default_qos;
938 iso_pi(sk)->sync_handle = -1;
939
940 bt_sock_link(&iso_sk_list, sk);
941 return sk;
942 }
943
iso_sock_create(struct net * net,struct socket * sock,int protocol,int kern)944 static int iso_sock_create(struct net *net, struct socket *sock, int protocol,
945 int kern)
946 {
947 struct sock *sk;
948
949 BT_DBG("sock %p", sock);
950
951 sock->state = SS_UNCONNECTED;
952
953 if (sock->type != SOCK_SEQPACKET)
954 return -ESOCKTNOSUPPORT;
955
956 sock->ops = &iso_sock_ops;
957
958 sk = iso_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
959 if (!sk)
960 return -ENOMEM;
961
962 iso_sock_init(sk, NULL);
963 return 0;
964 }
965
iso_sock_bind_bc(struct socket * sock,struct sockaddr_unsized * addr,int addr_len)966 static int iso_sock_bind_bc(struct socket *sock, struct sockaddr_unsized *addr,
967 int addr_len)
968 {
969 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
970 struct sock *sk = sock->sk;
971 int i;
972
973 BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid,
974 sa->iso_bc->bc_num_bis);
975
976 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc))
977 return -EINVAL;
978
979 bacpy(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr);
980
981 /* Check if the address type is of LE type */
982 if (!bdaddr_type_is_le(sa->iso_bc->bc_bdaddr_type))
983 return -EINVAL;
984
985 iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
986
987 if (sa->iso_bc->bc_sid > 0x0f && sa->iso_bc->bc_sid != HCI_SID_INVALID)
988 return -EINVAL;
989
990 iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
991
992 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS)
993 return -EINVAL;
994
995 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
996
997 for (i = 0; i < iso_pi(sk)->bc_num_bis; i++)
998 if (sa->iso_bc->bc_bis[i] < 0x01 ||
999 sa->iso_bc->bc_bis[i] > 0x1f)
1000 return -EINVAL;
1001
1002 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
1003 iso_pi(sk)->bc_num_bis);
1004
1005 return 0;
1006 }
1007
1008 /* Must be called on the locked socket. */
iso_sock_rebind_bis(struct sock * sk,struct sockaddr_iso * sa,int addr_len)1009 static int iso_sock_rebind_bis(struct sock *sk, struct sockaddr_iso *sa,
1010 int addr_len)
1011 {
1012 int err = 0;
1013
1014 if (!test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags))
1015 return -EBADFD;
1016
1017 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS) {
1018 err = -EINVAL;
1019 goto done;
1020 }
1021
1022 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
1023
1024 for (int i = 0; i < iso_pi(sk)->bc_num_bis; i++)
1025 if (sa->iso_bc->bc_bis[i] < 0x01 ||
1026 sa->iso_bc->bc_bis[i] > 0x1f) {
1027 err = -EINVAL;
1028 goto done;
1029 }
1030
1031 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
1032 iso_pi(sk)->bc_num_bis);
1033
1034 done:
1035 return err;
1036 }
1037
iso_conn_get_hdev(struct iso_conn * conn)1038 static struct hci_dev *iso_conn_get_hdev(struct iso_conn *conn)
1039 {
1040 struct hci_dev *hdev = NULL;
1041
1042 iso_conn_lock(conn);
1043 if (conn->hcon)
1044 hdev = hci_dev_hold(conn->hcon->hdev);
1045 iso_conn_unlock(conn);
1046
1047 return hdev;
1048 }
1049
1050 /* Must be called on the locked socket. */
iso_sock_rebind_bc(struct sock * sk,struct sockaddr_iso * sa,int addr_len)1051 static int iso_sock_rebind_bc(struct sock *sk, struct sockaddr_iso *sa,
1052 int addr_len)
1053 {
1054 struct hci_dev *hdev;
1055 struct hci_conn *bis;
1056 int err;
1057
1058 if (sk->sk_type != SOCK_SEQPACKET || !iso_pi(sk)->conn)
1059 return -EINVAL;
1060
1061 /* Check if it is really a Broadcast address being requested */
1062 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc))
1063 return -EINVAL;
1064
1065 /* Check if the address hasn't changed then perhaps only the number of
1066 * bis has changed.
1067 */
1068 if (!bacmp(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr) ||
1069 !bacmp(&sa->iso_bc->bc_bdaddr, BDADDR_ANY))
1070 return iso_sock_rebind_bis(sk, sa, addr_len);
1071
1072 /* Check if the address type is of LE type */
1073 if (!bdaddr_type_is_le(sa->iso_bc->bc_bdaddr_type))
1074 return -EINVAL;
1075
1076 hdev = iso_conn_get_hdev(iso_pi(sk)->conn);
1077 if (!hdev)
1078 return -EINVAL;
1079
1080 bis = iso_pi(sk)->conn->hcon;
1081
1082 /* Release the socket before lookups since that requires hci_dev_lock
1083 * which shall not be acquired while holding sock_lock for proper
1084 * ordering.
1085 */
1086 release_sock(sk);
1087 hci_dev_lock(bis->hdev);
1088 lock_sock(sk);
1089
1090 if (!iso_pi(sk)->conn || iso_pi(sk)->conn->hcon != bis) {
1091 /* raced with iso_conn_del() or iso_disconn_sock() */
1092 err = -ENOTCONN;
1093 goto unlock;
1094 }
1095
1096 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bc->bc_bdaddr,
1097 sa->iso_bc->bc_bdaddr_type);
1098
1099 err = hci_past_bis(bis, &sa->iso_bc->bc_bdaddr,
1100 le_addr_type(sa->iso_bc->bc_bdaddr_type));
1101
1102 unlock:
1103 hci_dev_unlock(hdev);
1104 hci_dev_put(hdev);
1105
1106 return err;
1107 }
1108
iso_sock_bind(struct socket * sock,struct sockaddr_unsized * addr,int addr_len)1109 static int iso_sock_bind(struct socket *sock, struct sockaddr_unsized *addr,
1110 int addr_len)
1111 {
1112 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1113 struct sock *sk = sock->sk;
1114 int err = 0;
1115
1116 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type);
1117
1118 if (!addr || addr_len < sizeof(struct sockaddr_iso) ||
1119 addr->sa_family != AF_BLUETOOTH)
1120 return -EINVAL;
1121
1122 lock_sock(sk);
1123
1124 if ((sk->sk_state == BT_CONNECT2 || sk->sk_state == BT_CONNECTED) &&
1125 addr_len > sizeof(*sa)) {
1126 /* Allow the user to rebind to a different address using
1127 * PAST procedures.
1128 */
1129 err = iso_sock_rebind_bc(sk, sa, addr_len);
1130 goto done;
1131 }
1132
1133 if (sk->sk_state != BT_OPEN) {
1134 err = -EBADFD;
1135 goto done;
1136 }
1137
1138 if (sk->sk_type != SOCK_SEQPACKET) {
1139 err = -EINVAL;
1140 goto done;
1141 }
1142
1143 /* Check if the address type is of LE type */
1144 if (!bdaddr_type_is_le(sa->iso_bdaddr_type)) {
1145 err = -EINVAL;
1146 goto done;
1147 }
1148
1149 bacpy(&iso_pi(sk)->src, &sa->iso_bdaddr);
1150 iso_pi(sk)->src_type = sa->iso_bdaddr_type;
1151
1152 /* Check for Broadcast address */
1153 if (addr_len > sizeof(*sa)) {
1154 err = iso_sock_bind_bc(sock, addr, addr_len);
1155 if (err)
1156 goto done;
1157 }
1158
1159 sk->sk_state = BT_BOUND;
1160
1161 done:
1162 release_sock(sk);
1163 return err;
1164 }
1165
iso_sock_connect(struct socket * sock,struct sockaddr_unsized * addr,int alen,int flags)1166 static int iso_sock_connect(struct socket *sock, struct sockaddr_unsized *addr,
1167 int alen, int flags)
1168 {
1169 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1170 struct sock *sk = sock->sk;
1171 int err;
1172
1173 BT_DBG("sk %p", sk);
1174
1175 if (alen < sizeof(struct sockaddr_iso) ||
1176 addr->sa_family != AF_BLUETOOTH)
1177 return -EINVAL;
1178
1179 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
1180 return -EBADFD;
1181
1182 if (sk->sk_type != SOCK_SEQPACKET)
1183 return -EINVAL;
1184
1185 /* Check if the address type is of LE type */
1186 if (!bdaddr_type_is_le(sa->iso_bdaddr_type))
1187 return -EINVAL;
1188
1189 lock_sock(sk);
1190
1191 bacpy(&iso_pi(sk)->dst, &sa->iso_bdaddr);
1192 iso_pi(sk)->dst_type = sa->iso_bdaddr_type;
1193
1194 release_sock(sk);
1195
1196 if (bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
1197 err = iso_connect_cis(sk);
1198 else
1199 err = iso_connect_bis(sk);
1200
1201 if (err)
1202 return err;
1203
1204 lock_sock(sk);
1205
1206 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1207 err = bt_sock_wait_state(sk, BT_CONNECTED,
1208 sock_sndtimeo(sk, flags & O_NONBLOCK));
1209 }
1210
1211 release_sock(sk);
1212 return err;
1213 }
1214
iso_listen_bis(struct sock * sk)1215 static int iso_listen_bis(struct sock *sk)
1216 {
1217 struct hci_dev *hdev;
1218 int err = 0;
1219 struct iso_conn *conn;
1220 struct hci_conn *hcon;
1221
1222 BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &iso_pi(sk)->src,
1223 &iso_pi(sk)->dst, iso_pi(sk)->bc_sid);
1224
1225 write_lock(&iso_sk_list.lock);
1226
1227 if (__iso_get_sock_listen_by_sid(&iso_pi(sk)->src, &iso_pi(sk)->dst,
1228 iso_pi(sk)->bc_sid))
1229 err = -EADDRINUSE;
1230
1231 write_unlock(&iso_sk_list.lock);
1232
1233 if (err)
1234 return err;
1235
1236 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
1237 iso_pi(sk)->src_type);
1238 if (!hdev)
1239 return -EHOSTUNREACH;
1240
1241 hci_dev_lock(hdev);
1242 lock_sock(sk);
1243
1244 /* Fail if user set invalid QoS */
1245 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(&iso_pi(sk)->qos)) {
1246 iso_pi(sk)->qos = default_qos;
1247 err = -EINVAL;
1248 goto unlock;
1249 }
1250
1251 hcon = hci_pa_create_sync(hdev, &iso_pi(sk)->dst,
1252 le_addr_type(iso_pi(sk)->dst_type),
1253 iso_pi(sk)->bc_sid, &iso_pi(sk)->qos);
1254 if (IS_ERR(hcon)) {
1255 err = PTR_ERR(hcon);
1256 goto unlock;
1257 }
1258
1259 conn = iso_conn_add(hcon);
1260 if (!conn) {
1261 hci_conn_drop(hcon);
1262 err = -ENOMEM;
1263 goto unlock;
1264 }
1265
1266 err = iso_chan_add(conn, sk, NULL);
1267 if (err) {
1268 hci_conn_drop(hcon);
1269 goto unlock;
1270 }
1271
1272 unlock:
1273 release_sock(sk);
1274 hci_dev_unlock(hdev);
1275 hci_dev_put(hdev);
1276 return err;
1277 }
1278
iso_listen_cis(struct sock * sk)1279 static int iso_listen_cis(struct sock *sk)
1280 {
1281 int err = 0;
1282
1283 BT_DBG("%pMR", &iso_pi(sk)->src);
1284
1285 write_lock(&iso_sk_list.lock);
1286
1287 if (__iso_get_sock_listen_by_addr(&iso_pi(sk)->src, &iso_pi(sk)->dst))
1288 err = -EADDRINUSE;
1289
1290 write_unlock(&iso_sk_list.lock);
1291
1292 return err;
1293 }
1294
iso_sock_listen(struct socket * sock,int backlog)1295 static int iso_sock_listen(struct socket *sock, int backlog)
1296 {
1297 struct sock *sk = sock->sk;
1298 int err = 0;
1299
1300 BT_DBG("sk %p backlog %d", sk, backlog);
1301
1302 sock_hold(sk);
1303 lock_sock(sk);
1304
1305 if (sk->sk_state != BT_BOUND) {
1306 err = -EBADFD;
1307 goto done;
1308 }
1309
1310 if (sk->sk_type != SOCK_SEQPACKET) {
1311 err = -EINVAL;
1312 goto done;
1313 }
1314
1315 if (!bacmp(&iso_pi(sk)->dst, BDADDR_ANY)) {
1316 err = iso_listen_cis(sk);
1317 } else {
1318 /* Drop sock lock to avoid potential
1319 * deadlock with the hdev lock.
1320 */
1321 release_sock(sk);
1322 err = iso_listen_bis(sk);
1323 lock_sock(sk);
1324 }
1325
1326 if (err)
1327 goto done;
1328
1329 sk->sk_max_ack_backlog = backlog;
1330 sk->sk_ack_backlog = 0;
1331
1332 sk->sk_state = BT_LISTEN;
1333
1334 done:
1335 release_sock(sk);
1336 sock_put(sk);
1337 return err;
1338 }
1339
iso_sock_accept(struct socket * sock,struct socket * newsock,struct proto_accept_arg * arg)1340 static int iso_sock_accept(struct socket *sock, struct socket *newsock,
1341 struct proto_accept_arg *arg)
1342 {
1343 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1344 struct sock *sk = sock->sk, *ch;
1345 long timeo;
1346 int err = 0;
1347
1348 /* Use explicit nested locking to avoid lockdep warnings generated
1349 * because the parent socket and the child socket are locked on the
1350 * same thread.
1351 */
1352 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1353
1354 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
1355
1356 BT_DBG("sk %p timeo %ld", sk, timeo);
1357
1358 /* Wait for an incoming connection. (wake-one). */
1359 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1360 while (1) {
1361 if (sk->sk_state != BT_LISTEN) {
1362 err = -EBADFD;
1363 break;
1364 }
1365
1366 ch = bt_accept_dequeue(sk, newsock);
1367 if (ch)
1368 break;
1369
1370 if (!timeo) {
1371 err = -EAGAIN;
1372 break;
1373 }
1374
1375 if (signal_pending(current)) {
1376 err = sock_intr_errno(timeo);
1377 break;
1378 }
1379
1380 release_sock(sk);
1381
1382 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1383 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1384 }
1385 remove_wait_queue(sk_sleep(sk), &wait);
1386
1387 if (err)
1388 goto done;
1389
1390 newsock->state = SS_CONNECTED;
1391
1392 BT_DBG("new socket %p", ch);
1393
1394 /* A Broadcast Sink might require BIG sync to be terminated
1395 * and re-established multiple times, while keeping the same
1396 * PA sync handle active. To allow this, once all BIS
1397 * connections have been accepted on a PA sync parent socket,
1398 * "reset" socket state, to allow future BIG re-sync procedures.
1399 */
1400 if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) {
1401 /* Iterate through the list of bound BIS indices
1402 * and clear each BIS as they are accepted by the
1403 * user space, one by one.
1404 */
1405 for (int i = 0; i < iso_pi(sk)->bc_num_bis; i++) {
1406 if (iso_pi(sk)->bc_bis[i] > 0) {
1407 iso_pi(sk)->bc_bis[i] = 0;
1408 iso_pi(sk)->bc_num_bis--;
1409 break;
1410 }
1411 }
1412
1413 if (iso_pi(sk)->bc_num_bis == 0) {
1414 /* Once the last BIS was accepted, reset parent
1415 * socket parameters to mark that the listening
1416 * process for BIS connections has been completed:
1417 *
1418 * 1. Reset the DEFER setup flag on the parent sk.
1419 * 2. Clear the flag marking that the BIG create
1420 * sync command is pending.
1421 * 3. Transition socket state from BT_LISTEN to
1422 * BT_CONNECTED.
1423 */
1424 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1425 clear_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags);
1426 sk->sk_state = BT_CONNECTED;
1427 }
1428 }
1429
1430 done:
1431 release_sock(sk);
1432 return err;
1433 }
1434
iso_sock_getname(struct socket * sock,struct sockaddr * addr,int peer)1435 static int iso_sock_getname(struct socket *sock, struct sockaddr *addr,
1436 int peer)
1437 {
1438 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1439 struct sock *sk = sock->sk;
1440 int len = sizeof(struct sockaddr_iso);
1441
1442 BT_DBG("sock %p, sk %p", sock, sk);
1443
1444 addr->sa_family = AF_BLUETOOTH;
1445
1446 if (peer) {
1447 struct hci_conn *hcon = iso_pi(sk)->conn ?
1448 iso_pi(sk)->conn->hcon : NULL;
1449
1450 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->dst);
1451 sa->iso_bdaddr_type = iso_pi(sk)->dst_type;
1452
1453 if (hcon && (hcon->type == BIS_LINK || hcon->type == PA_LINK)) {
1454 sa->iso_bc->bc_sid = iso_pi(sk)->bc_sid;
1455 sa->iso_bc->bc_num_bis = iso_pi(sk)->bc_num_bis;
1456 memcpy(sa->iso_bc->bc_bis, iso_pi(sk)->bc_bis,
1457 ISO_MAX_NUM_BIS);
1458 len += sizeof(struct sockaddr_iso_bc);
1459 }
1460 } else {
1461 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->src);
1462 sa->iso_bdaddr_type = iso_pi(sk)->src_type;
1463 }
1464
1465 return len;
1466 }
1467
iso_sock_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1468 static int iso_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1469 size_t len)
1470 {
1471 struct sock *sk = sock->sk;
1472 struct sk_buff *skb, **frag;
1473 struct sockcm_cookie sockc;
1474 size_t mtu;
1475 int err;
1476
1477 BT_DBG("sock %p, sk %p", sock, sk);
1478
1479 err = sock_error(sk);
1480 if (err)
1481 return err;
1482
1483 if (msg->msg_flags & MSG_OOB)
1484 return -EOPNOTSUPP;
1485
1486 hci_sockcm_init(&sockc, sk);
1487
1488 if (msg->msg_controllen) {
1489 err = sock_cmsg_send(sk, msg, &sockc);
1490 if (err)
1491 return err;
1492 }
1493
1494 lock_sock(sk);
1495
1496 if (sk->sk_state != BT_CONNECTED) {
1497 release_sock(sk);
1498 return -ENOTCONN;
1499 }
1500
1501 mtu = iso_pi(sk)->conn->hcon->mtu;
1502
1503 release_sock(sk);
1504
1505 skb = bt_skb_sendmsg(sk, msg, len, mtu, HCI_ISO_DATA_HDR_SIZE, 0);
1506 if (IS_ERR(skb))
1507 return PTR_ERR(skb);
1508
1509 len -= skb->len;
1510
1511 BT_DBG("skb %p len %d", sk, skb->len);
1512
1513 /* Continuation fragments */
1514 frag = &skb_shinfo(skb)->frag_list;
1515 while (len) {
1516 struct sk_buff *tmp;
1517
1518 tmp = bt_skb_sendmsg(sk, msg, len, mtu, 0, 0);
1519 if (IS_ERR(tmp)) {
1520 kfree_skb(skb);
1521 return PTR_ERR(tmp);
1522 }
1523
1524 *frag = tmp;
1525
1526 len -= tmp->len;
1527
1528 skb->len += tmp->len;
1529 skb->data_len += tmp->len;
1530
1531 BT_DBG("frag %p len %d", *frag, tmp->len);
1532
1533 frag = &(*frag)->next;
1534 }
1535
1536 lock_sock(sk);
1537
1538 if (sk->sk_state == BT_CONNECTED)
1539 err = iso_send_frame(sk, skb, &sockc);
1540 else
1541 err = -ENOTCONN;
1542
1543 release_sock(sk);
1544
1545 if (err < 0)
1546 kfree_skb(skb);
1547 return err;
1548 }
1549
iso_conn_defer_accept(struct hci_conn * conn)1550 static void iso_conn_defer_accept(struct hci_conn *conn)
1551 {
1552 struct hci_cp_le_accept_cis cp;
1553 struct hci_dev *hdev = conn->hdev;
1554
1555 BT_DBG("conn %p", conn);
1556
1557 conn->state = BT_CONFIG;
1558
1559 cp.handle = cpu_to_le16(conn->handle);
1560
1561 hci_send_cmd(hdev, HCI_OP_LE_ACCEPT_CIS, sizeof(cp), &cp);
1562 }
1563
iso_conn_big_sync(struct sock * sk)1564 static void iso_conn_big_sync(struct sock *sk)
1565 {
1566 int err;
1567 struct hci_dev *hdev;
1568
1569 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
1570 iso_pi(sk)->src_type);
1571
1572 if (!hdev)
1573 return;
1574
1575 /* hci_le_big_create_sync requires hdev lock to be held, since
1576 * it enqueues the HCI LE BIG Create Sync command via
1577 * hci_cmd_sync_queue_once, which checks hdev flags that might
1578 * change.
1579 */
1580 hci_dev_lock(hdev);
1581 lock_sock(sk);
1582
1583 if (!test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags)) {
1584 err = hci_conn_big_create_sync(hdev, iso_pi(sk)->conn->hcon,
1585 &iso_pi(sk)->qos,
1586 iso_pi(sk)->sync_handle,
1587 iso_pi(sk)->bc_num_bis,
1588 iso_pi(sk)->bc_bis);
1589 if (err)
1590 bt_dev_err(hdev, "hci_big_create_sync: %d", err);
1591 }
1592
1593 release_sock(sk);
1594 hci_dev_unlock(hdev);
1595 }
1596
iso_sock_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)1597 static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1598 size_t len, int flags)
1599 {
1600 struct sock *sk = sock->sk;
1601 struct iso_pinfo *pi = iso_pi(sk);
1602 bool early_ret = false;
1603 int err = 0;
1604
1605 BT_DBG("sk %p", sk);
1606
1607 if (unlikely(flags & MSG_ERRQUEUE))
1608 return sock_recv_errqueue(sk, msg, len, SOL_BLUETOOTH,
1609 BT_SCM_ERROR);
1610
1611 if (test_and_clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1612 sock_hold(sk);
1613 lock_sock(sk);
1614
1615 switch (sk->sk_state) {
1616 case BT_CONNECT2:
1617 if (test_bit(BT_SK_PA_SYNC, &pi->flags)) {
1618 release_sock(sk);
1619 iso_conn_big_sync(sk);
1620 lock_sock(sk);
1621
1622 sk->sk_state = BT_LISTEN;
1623 } else {
1624 iso_conn_defer_accept(pi->conn->hcon);
1625 sk->sk_state = BT_CONFIG;
1626 }
1627
1628 early_ret = true;
1629 break;
1630 case BT_CONNECTED:
1631 if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) {
1632 release_sock(sk);
1633 iso_conn_big_sync(sk);
1634 lock_sock(sk);
1635
1636 sk->sk_state = BT_LISTEN;
1637 early_ret = true;
1638 }
1639
1640 break;
1641 case BT_CONNECT:
1642 release_sock(sk);
1643 err = iso_connect_cis(sk);
1644 lock_sock(sk);
1645
1646 early_ret = true;
1647 break;
1648 default:
1649 break;
1650 }
1651
1652 release_sock(sk);
1653 sock_put(sk);
1654
1655 if (early_ret)
1656 return err;
1657 }
1658
1659 return bt_sock_recvmsg(sock, msg, len, flags);
1660 }
1661
check_io_qos(struct bt_iso_io_qos * qos)1662 static bool check_io_qos(struct bt_iso_io_qos *qos)
1663 {
1664 /* If no PHY is enable SDU must be 0 */
1665 if (!qos->phys && qos->sdu)
1666 return false;
1667
1668 if (qos->interval && (qos->interval < 0xff || qos->interval > 0xfffff))
1669 return false;
1670
1671 if (qos->latency && (qos->latency < 0x05 || qos->latency > 0xfa0))
1672 return false;
1673
1674 if (qos->phys > BT_ISO_PHY_ANY)
1675 return false;
1676
1677 return true;
1678 }
1679
check_ucast_qos(struct bt_iso_qos * qos)1680 static bool check_ucast_qos(struct bt_iso_qos *qos)
1681 {
1682 if (qos->ucast.cig > 0xef && qos->ucast.cig != BT_ISO_QOS_CIG_UNSET)
1683 return false;
1684
1685 if (qos->ucast.cis > 0xef && qos->ucast.cis != BT_ISO_QOS_CIS_UNSET)
1686 return false;
1687
1688 if (qos->ucast.sca > 0x07)
1689 return false;
1690
1691 if (qos->ucast.packing > 0x01)
1692 return false;
1693
1694 if (qos->ucast.framing > 0x01)
1695 return false;
1696
1697 if (!check_io_qos(&qos->ucast.in))
1698 return false;
1699
1700 if (!check_io_qos(&qos->ucast.out))
1701 return false;
1702
1703 return true;
1704 }
1705
check_bcast_qos(struct bt_iso_qos * qos)1706 static bool check_bcast_qos(struct bt_iso_qos *qos)
1707 {
1708 if (!qos->bcast.sync_factor)
1709 qos->bcast.sync_factor = 0x01;
1710
1711 if (qos->bcast.packing > 0x01)
1712 return false;
1713
1714 if (qos->bcast.framing > 0x01)
1715 return false;
1716
1717 if (!check_io_qos(&qos->bcast.in))
1718 return false;
1719
1720 if (!check_io_qos(&qos->bcast.out))
1721 return false;
1722
1723 if (qos->bcast.encryption > 0x01)
1724 return false;
1725
1726 if (qos->bcast.options > 0x07)
1727 return false;
1728
1729 if (qos->bcast.skip > 0x01f3)
1730 return false;
1731
1732 if (!qos->bcast.sync_timeout)
1733 qos->bcast.sync_timeout = BT_ISO_SYNC_TIMEOUT;
1734
1735 if (qos->bcast.sync_timeout < 0x000a || qos->bcast.sync_timeout > 0x4000)
1736 return false;
1737
1738 if (qos->bcast.sync_cte_type > 0x1f)
1739 return false;
1740
1741 if (qos->bcast.mse > 0x1f)
1742 return false;
1743
1744 if (!qos->bcast.timeout)
1745 qos->bcast.sync_timeout = BT_ISO_SYNC_TIMEOUT;
1746
1747 if (qos->bcast.timeout < 0x000a || qos->bcast.timeout > 0x4000)
1748 return false;
1749
1750 return true;
1751 }
1752
iso_sock_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)1753 static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
1754 sockptr_t optval, unsigned int optlen)
1755 {
1756 struct sock *sk = sock->sk;
1757 int err = 0;
1758 struct bt_iso_qos qos = default_qos;
1759 u32 opt;
1760
1761 BT_DBG("sk %p", sk);
1762
1763 lock_sock(sk);
1764
1765 switch (optname) {
1766 case BT_DEFER_SETUP:
1767 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1768 err = -EINVAL;
1769 break;
1770 }
1771
1772 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
1773 if (err)
1774 break;
1775
1776 if (opt)
1777 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1778 else
1779 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1780 break;
1781
1782 case BT_PKT_STATUS:
1783 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
1784 if (err)
1785 break;
1786
1787 if (opt)
1788 set_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
1789 else
1790 clear_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
1791 break;
1792
1793 case BT_PKT_SEQNUM:
1794 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
1795 if (err)
1796 break;
1797
1798 if (opt)
1799 set_bit(BT_SK_PKT_SEQNUM, &bt_sk(sk)->flags);
1800 else
1801 clear_bit(BT_SK_PKT_SEQNUM, &bt_sk(sk)->flags);
1802 break;
1803
1804 case BT_ISO_QOS:
1805 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1806 sk->sk_state != BT_CONNECT2 &&
1807 (!test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags) ||
1808 sk->sk_state != BT_CONNECTED)) {
1809 err = -EINVAL;
1810 break;
1811 }
1812
1813 err = copy_safe_from_sockptr(&qos, sizeof(qos), optval, optlen);
1814 if (err)
1815 break;
1816
1817 iso_pi(sk)->qos = qos;
1818 iso_pi(sk)->qos_user_set = true;
1819
1820 break;
1821
1822 case BT_ISO_BASE:
1823 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1824 sk->sk_state != BT_CONNECT2) {
1825 err = -EINVAL;
1826 break;
1827 }
1828
1829 if (optlen > sizeof(iso_pi(sk)->base)) {
1830 err = -EINVAL;
1831 break;
1832 }
1833
1834 err = copy_safe_from_sockptr(iso_pi(sk)->base, optlen, optval,
1835 optlen);
1836 if (err)
1837 break;
1838
1839 iso_pi(sk)->base_len = optlen;
1840
1841 break;
1842
1843 default:
1844 err = -ENOPROTOOPT;
1845 break;
1846 }
1847
1848 release_sock(sk);
1849 return err;
1850 }
1851
iso_sock_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)1852 static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
1853 char __user *optval, int __user *optlen)
1854 {
1855 struct sock *sk = sock->sk;
1856 int len, err = 0;
1857 struct bt_iso_qos *qos;
1858 u8 base_len;
1859 u8 *base;
1860
1861 BT_DBG("sk %p", sk);
1862
1863 if (get_user(len, optlen))
1864 return -EFAULT;
1865
1866 lock_sock(sk);
1867
1868 switch (optname) {
1869 case BT_DEFER_SETUP:
1870 if (sk->sk_state == BT_CONNECTED) {
1871 err = -EINVAL;
1872 break;
1873 }
1874
1875 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
1876 (u32 __user *)optval))
1877 err = -EFAULT;
1878
1879 break;
1880
1881 case BT_PKT_STATUS:
1882 if (put_user(test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags),
1883 (int __user *)optval))
1884 err = -EFAULT;
1885 break;
1886
1887 case BT_ISO_QOS:
1888 qos = iso_sock_get_qos(sk);
1889
1890 len = min_t(unsigned int, len, sizeof(*qos));
1891 if (copy_to_user(optval, qos, len))
1892 err = -EFAULT;
1893
1894 break;
1895
1896 case BT_ISO_BASE:
1897 if (sk->sk_state == BT_CONNECTED &&
1898 !bacmp(&iso_pi(sk)->dst, BDADDR_ANY)) {
1899 base_len = iso_pi(sk)->conn->hcon->le_per_adv_data_len;
1900 base = iso_pi(sk)->conn->hcon->le_per_adv_data;
1901 } else {
1902 base_len = iso_pi(sk)->base_len;
1903 base = iso_pi(sk)->base;
1904 }
1905
1906 len = min_t(unsigned int, len, base_len);
1907 if (copy_to_user(optval, base, len))
1908 err = -EFAULT;
1909 if (put_user(len, optlen))
1910 err = -EFAULT;
1911
1912 break;
1913
1914 default:
1915 err = -ENOPROTOOPT;
1916 break;
1917 }
1918
1919 release_sock(sk);
1920 return err;
1921 }
1922
iso_sock_shutdown(struct socket * sock,int how)1923 static int iso_sock_shutdown(struct socket *sock, int how)
1924 {
1925 struct sock *sk = sock->sk;
1926 int err = 0;
1927
1928 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1929
1930 if (!sk)
1931 return 0;
1932
1933 sock_hold(sk);
1934 lock_sock(sk);
1935
1936 switch (how) {
1937 case SHUT_RD:
1938 if (sk->sk_shutdown & RCV_SHUTDOWN)
1939 goto unlock;
1940 sk->sk_shutdown |= RCV_SHUTDOWN;
1941 break;
1942 case SHUT_WR:
1943 if (sk->sk_shutdown & SEND_SHUTDOWN)
1944 goto unlock;
1945 sk->sk_shutdown |= SEND_SHUTDOWN;
1946 break;
1947 case SHUT_RDWR:
1948 if (sk->sk_shutdown & SHUTDOWN_MASK)
1949 goto unlock;
1950 sk->sk_shutdown |= SHUTDOWN_MASK;
1951 break;
1952 }
1953
1954 iso_sock_clear_timer(sk);
1955 __iso_sock_close(sk);
1956
1957 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1958 !(current->flags & PF_EXITING))
1959 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1960
1961 unlock:
1962 release_sock(sk);
1963 sock_put(sk);
1964
1965 return err;
1966 }
1967
iso_sock_release(struct socket * sock)1968 static int iso_sock_release(struct socket *sock)
1969 {
1970 struct sock *sk = sock->sk;
1971 int err = 0;
1972
1973 BT_DBG("sock %p, sk %p", sock, sk);
1974
1975 if (!sk)
1976 return 0;
1977
1978 iso_sock_close(sk);
1979
1980 if (sock_flag(sk, SOCK_LINGER) && READ_ONCE(sk->sk_lingertime) &&
1981 !(current->flags & PF_EXITING)) {
1982 lock_sock(sk);
1983 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1984 release_sock(sk);
1985 }
1986
1987 sock_orphan(sk);
1988 iso_sock_kill(sk);
1989 return err;
1990 }
1991
iso_sock_ready(struct sock * sk)1992 static void iso_sock_ready(struct sock *sk)
1993 {
1994 BT_DBG("sk %p", sk);
1995
1996 if (!sk)
1997 return;
1998
1999 lock_sock(sk);
2000 iso_sock_clear_timer(sk);
2001 sk->sk_state = BT_CONNECTED;
2002 sk->sk_state_change(sk);
2003 release_sock(sk);
2004 }
2005
iso_match_big(struct sock * sk,void * data)2006 static bool iso_match_big(struct sock *sk, void *data)
2007 {
2008 struct hci_evt_le_big_sync_established *ev = data;
2009
2010 return ev->handle == iso_pi(sk)->qos.bcast.big;
2011 }
2012
iso_match_big_hcon(struct sock * sk,void * data)2013 static bool iso_match_big_hcon(struct sock *sk, void *data)
2014 {
2015 struct hci_conn *hcon = data;
2016
2017 return hcon->iso_qos.bcast.big == iso_pi(sk)->qos.bcast.big;
2018 }
2019
iso_match_pa_sync_flag(struct sock * sk,void * data)2020 static bool iso_match_pa_sync_flag(struct sock *sk, void *data)
2021 {
2022 return test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags);
2023 }
2024
iso_match_dst(struct sock * sk,void * data)2025 static bool iso_match_dst(struct sock *sk, void *data)
2026 {
2027 return !bacmp(&iso_pi(sk)->dst, (bdaddr_t *)data);
2028 }
2029
iso_conn_ready(struct iso_conn * conn)2030 static void iso_conn_ready(struct iso_conn *conn)
2031 {
2032 struct sock *parent = NULL;
2033 struct sock *sk = conn->sk;
2034 struct hci_ev_le_big_sync_established *ev = NULL;
2035 struct hci_ev_le_pa_sync_established *ev2 = NULL;
2036 struct hci_ev_le_per_adv_report *ev3 = NULL;
2037 struct hci_conn *hcon;
2038 struct hci_dev *hdev;
2039
2040 BT_DBG("conn %p", conn);
2041
2042 if (sk) {
2043 /* Attempt to update source address in case of BIS Sender if
2044 * the advertisement is using a random address.
2045 */
2046 if (conn->hcon->type == BIS_LINK &&
2047 conn->hcon->role == HCI_ROLE_MASTER &&
2048 !bacmp(&conn->hcon->dst, BDADDR_ANY)) {
2049 struct hci_conn *bis = conn->hcon;
2050 struct adv_info *adv;
2051
2052 adv = hci_find_adv_instance(bis->hdev,
2053 bis->iso_qos.bcast.bis);
2054 if (adv && bacmp(&adv->random_addr, BDADDR_ANY)) {
2055 lock_sock(sk);
2056 iso_pi(sk)->src_type = BDADDR_LE_RANDOM;
2057 bacpy(&iso_pi(sk)->src, &adv->random_addr);
2058 release_sock(sk);
2059 }
2060 }
2061
2062 iso_sock_ready(conn->sk);
2063 } else {
2064 hcon = conn->hcon;
2065 if (!hcon)
2066 return;
2067
2068 hdev = hcon->hdev;
2069
2070 if (test_bit(HCI_CONN_BIG_SYNC, &hcon->flags)) {
2071 /* A BIS slave hcon is notified to the ISO layer
2072 * after the Command Complete for the LE Setup
2073 * ISO Data Path command is received. Get the
2074 * parent socket that matches the hcon BIG handle.
2075 */
2076 parent = iso_get_sock(hdev, &hcon->src, &hcon->dst,
2077 BT_LISTEN, iso_match_big_hcon,
2078 hcon);
2079 } else if (test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags)) {
2080 ev = hci_recv_event_data(hcon->hdev,
2081 HCI_EVT_LE_BIG_SYNC_ESTABLISHED);
2082
2083 /* Get reference to PA sync parent socket, if it exists */
2084 parent = iso_get_sock(hdev, &hcon->src, &hcon->dst,
2085 BT_LISTEN,
2086 iso_match_pa_sync_flag,
2087 NULL);
2088 if (!parent && ev)
2089 parent = iso_get_sock(hdev, &hcon->src,
2090 &hcon->dst,
2091 BT_LISTEN,
2092 iso_match_big, ev);
2093 } else if (test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
2094 ev2 = hci_recv_event_data(hcon->hdev,
2095 HCI_EV_LE_PA_SYNC_ESTABLISHED);
2096 if (ev2)
2097 parent = iso_get_sock(hdev, &hcon->src,
2098 &hcon->dst,
2099 BT_LISTEN,
2100 iso_match_sid, ev2);
2101 } else if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) {
2102 ev3 = hci_recv_event_data(hcon->hdev,
2103 HCI_EV_LE_PER_ADV_REPORT);
2104 if (ev3)
2105 parent = iso_get_sock(hdev, &hcon->src,
2106 &hcon->dst,
2107 BT_LISTEN,
2108 iso_match_sync_handle_pa_report,
2109 ev3);
2110 }
2111
2112 if (!parent)
2113 parent = iso_get_sock(hdev, &hcon->src, BDADDR_ANY,
2114 BT_LISTEN, iso_match_dst, BDADDR_ANY);
2115
2116 if (!parent)
2117 return;
2118
2119 lock_sock(parent);
2120
2121 sk = iso_sock_alloc(sock_net(parent), NULL,
2122 BTPROTO_ISO, GFP_ATOMIC, 0);
2123 if (!sk) {
2124 release_sock(parent);
2125 return;
2126 }
2127
2128 iso_sock_init(sk, parent);
2129
2130 bacpy(&iso_pi(sk)->src, &hcon->src);
2131
2132 /* Convert from HCI to three-value type */
2133 if (hcon->src_type == ADDR_LE_DEV_PUBLIC)
2134 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
2135 else
2136 iso_pi(sk)->src_type = BDADDR_LE_RANDOM;
2137
2138 /* If hcon has no destination address (BDADDR_ANY) it means it
2139 * was created by HCI_EV_LE_BIG_SYNC_ESTABILISHED or
2140 * HCI_EV_LE_PA_SYNC_ESTABLISHED so we need to initialize using
2141 * the parent socket destination address.
2142 */
2143 if (!bacmp(&hcon->dst, BDADDR_ANY)) {
2144 bacpy(&hcon->dst, &iso_pi(parent)->dst);
2145 hcon->dst_type = le_addr_type(iso_pi(parent)->dst_type);
2146 }
2147
2148 if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) {
2149 iso_pi(sk)->qos = iso_pi(parent)->qos;
2150 hcon->iso_qos = iso_pi(sk)->qos;
2151 iso_pi(sk)->bc_sid = iso_pi(parent)->bc_sid;
2152 iso_pi(sk)->bc_num_bis = iso_pi(parent)->bc_num_bis;
2153 memcpy(iso_pi(sk)->bc_bis, iso_pi(parent)->bc_bis,
2154 ISO_MAX_NUM_BIS);
2155 set_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags);
2156 }
2157
2158 bacpy(&iso_pi(sk)->dst, &hcon->dst);
2159
2160 /* Convert from HCI to three-value type */
2161 if (hcon->dst_type == ADDR_LE_DEV_PUBLIC)
2162 iso_pi(sk)->dst_type = BDADDR_LE_PUBLIC;
2163 else
2164 iso_pi(sk)->dst_type = BDADDR_LE_RANDOM;
2165
2166 iso_pi(sk)->sync_handle = iso_pi(parent)->sync_handle;
2167 memcpy(iso_pi(sk)->base, iso_pi(parent)->base, iso_pi(parent)->base_len);
2168 iso_pi(sk)->base_len = iso_pi(parent)->base_len;
2169
2170 hci_conn_hold(hcon);
2171 iso_chan_add(conn, sk, parent);
2172
2173 if ((ev && ((struct hci_evt_le_big_sync_established *)ev)->status) ||
2174 (ev2 && ev2->status)) {
2175 /* Trigger error signal on child socket */
2176 sk->sk_err = ECONNREFUSED;
2177 sk->sk_error_report(sk);
2178 }
2179
2180 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
2181 sk->sk_state = BT_CONNECT2;
2182 else
2183 sk->sk_state = BT_CONNECTED;
2184
2185 /* Wake up parent */
2186 parent->sk_data_ready(parent);
2187
2188 release_sock(parent);
2189 sock_put(parent);
2190 }
2191 }
2192
iso_match_sid(struct sock * sk,void * data)2193 static bool iso_match_sid(struct sock *sk, void *data)
2194 {
2195 struct hci_ev_le_pa_sync_established *ev = data;
2196
2197 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID)
2198 return true;
2199
2200 return ev->sid == iso_pi(sk)->bc_sid;
2201 }
2202
iso_match_sid_past(struct sock * sk,void * data)2203 static bool iso_match_sid_past(struct sock *sk, void *data)
2204 {
2205 struct hci_ev_le_past_received *ev = data;
2206
2207 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID)
2208 return true;
2209
2210 return ev->sid == iso_pi(sk)->bc_sid;
2211 }
2212
iso_match_sync_handle(struct sock * sk,void * data)2213 static bool iso_match_sync_handle(struct sock *sk, void *data)
2214 {
2215 struct hci_evt_le_big_info_adv_report *ev = data;
2216
2217 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
2218 }
2219
iso_match_sync_handle_pa_report(struct sock * sk,void * data)2220 static bool iso_match_sync_handle_pa_report(struct sock *sk, void *data)
2221 {
2222 struct hci_ev_le_per_adv_report *ev = data;
2223
2224 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
2225 }
2226
2227 /* ----- ISO interface with lower layer (HCI) ----- */
2228
iso_connect_ind(struct hci_dev * hdev,bdaddr_t * bdaddr,__u8 * flags)2229 int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
2230 {
2231 struct hci_ev_le_pa_sync_established *ev1;
2232 struct hci_ev_le_past_received *ev1a;
2233 struct hci_evt_le_big_info_adv_report *ev2;
2234 struct hci_ev_le_per_adv_report *ev3;
2235 struct sock *sk;
2236
2237 bt_dev_dbg(hdev, "bdaddr %pMR", bdaddr);
2238
2239 /* Broadcast receiver requires handling of some events before it can
2240 * proceed to establishing a BIG sync:
2241 *
2242 * 1. HCI_EV_LE_PA_SYNC_ESTABLISHED: The socket may specify a specific
2243 * SID to listen to and once sync is established its handle needs to
2244 * be stored in iso_pi(sk)->sync_handle so it can be matched once
2245 * receiving the BIG Info.
2246 * 1a. HCI_EV_LE_PAST_RECEIVED: alternative to 1.
2247 * 2. HCI_EVT_LE_BIG_INFO_ADV_REPORT: When connect_ind is triggered by a
2248 * a BIG Info it attempts to check if there any listening socket with
2249 * the same sync_handle and if it does then attempt to create a sync.
2250 * 3. HCI_EV_LE_PER_ADV_REPORT: When a PA report is received, it is stored
2251 * in iso_pi(sk)->base so it can be passed up to user, in the case of a
2252 * broadcast sink.
2253 */
2254 ev1 = hci_recv_event_data(hdev, HCI_EV_LE_PA_SYNC_ESTABLISHED);
2255 if (ev1) {
2256 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN,
2257 iso_match_sid, ev1);
2258 if (sk && !ev1->status) {
2259 iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);
2260 iso_pi(sk)->bc_sid = ev1->sid;
2261 }
2262
2263 goto done;
2264 }
2265
2266 ev1a = hci_recv_event_data(hdev, HCI_EV_LE_PAST_RECEIVED);
2267 if (ev1a) {
2268 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN,
2269 iso_match_sid_past, ev1a);
2270 if (sk && !ev1a->status) {
2271 iso_pi(sk)->sync_handle = le16_to_cpu(ev1a->sync_handle);
2272 iso_pi(sk)->bc_sid = ev1a->sid;
2273 }
2274
2275 goto done;
2276 }
2277
2278 ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT);
2279 if (ev2) {
2280 /* Check if BIGInfo report has already been handled */
2281 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_CONNECTED,
2282 iso_match_sync_handle, ev2);
2283 if (sk) {
2284 sock_put(sk);
2285 sk = NULL;
2286 goto done;
2287 }
2288
2289 /* Try to get PA sync socket, if it exists */
2290 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_CONNECT2,
2291 iso_match_sync_handle, ev2);
2292 if (!sk)
2293 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr,
2294 BT_LISTEN,
2295 iso_match_sync_handle,
2296 ev2);
2297
2298 if (sk) {
2299 int err;
2300 struct hci_conn *hcon = iso_pi(sk)->conn->hcon;
2301
2302 iso_pi(sk)->qos.bcast.encryption = ev2->encryption;
2303
2304 if (ev2->num_bis < iso_pi(sk)->bc_num_bis)
2305 iso_pi(sk)->bc_num_bis = ev2->num_bis;
2306
2307 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags) &&
2308 !test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags)) {
2309 err = hci_conn_big_create_sync(hdev, hcon,
2310 &iso_pi(sk)->qos,
2311 iso_pi(sk)->sync_handle,
2312 iso_pi(sk)->bc_num_bis,
2313 iso_pi(sk)->bc_bis);
2314 if (err) {
2315 bt_dev_err(hdev, "hci_le_big_create_sync: %d",
2316 err);
2317 sock_put(sk);
2318 sk = NULL;
2319 }
2320 }
2321 }
2322
2323 goto done;
2324 }
2325
2326 ev3 = hci_recv_event_data(hdev, HCI_EV_LE_PER_ADV_REPORT);
2327 if (ev3) {
2328 size_t base_len = 0;
2329 u8 *base;
2330 struct hci_conn *hcon;
2331
2332 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN,
2333 iso_match_sync_handle_pa_report, ev3);
2334 if (!sk)
2335 goto done;
2336
2337 hcon = iso_pi(sk)->conn->hcon;
2338 if (!hcon)
2339 goto done;
2340
2341 if (ev3->data_status == LE_PA_DATA_TRUNCATED) {
2342 /* The controller was unable to retrieve PA data. */
2343 memset(hcon->le_per_adv_data, 0,
2344 HCI_MAX_PER_AD_TOT_LEN);
2345 hcon->le_per_adv_data_len = 0;
2346 hcon->le_per_adv_data_offset = 0;
2347 goto done;
2348 }
2349
2350 if (hcon->le_per_adv_data_offset + ev3->length >
2351 HCI_MAX_PER_AD_TOT_LEN)
2352 goto done;
2353
2354 memcpy(hcon->le_per_adv_data + hcon->le_per_adv_data_offset,
2355 ev3->data, ev3->length);
2356 hcon->le_per_adv_data_offset += ev3->length;
2357
2358 if (ev3->data_status == LE_PA_DATA_COMPLETE) {
2359 /* All PA data has been received. */
2360 hcon->le_per_adv_data_len =
2361 hcon->le_per_adv_data_offset;
2362 hcon->le_per_adv_data_offset = 0;
2363
2364 /* Extract BASE */
2365 base = eir_get_service_data(hcon->le_per_adv_data,
2366 hcon->le_per_adv_data_len,
2367 EIR_BAA_SERVICE_UUID,
2368 &base_len);
2369
2370 if (!base || base_len > BASE_MAX_LENGTH)
2371 goto done;
2372
2373 memcpy(iso_pi(sk)->base, base, base_len);
2374 iso_pi(sk)->base_len = base_len;
2375 } else {
2376 /* This is a PA data fragment. Keep pa_data_len set to 0
2377 * until all data has been reassembled.
2378 */
2379 hcon->le_per_adv_data_len = 0;
2380 }
2381 } else {
2382 sk = iso_get_sock(hdev, &hdev->bdaddr, BDADDR_ANY,
2383 BT_LISTEN, iso_match_dst, BDADDR_ANY);
2384 }
2385
2386 done:
2387 if (!sk)
2388 return 0;
2389
2390 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
2391 *flags |= HCI_PROTO_DEFER;
2392
2393 sock_put(sk);
2394
2395 return HCI_LM_ACCEPT;
2396 }
2397
iso_connect_cfm(struct hci_conn * hcon,__u8 status)2398 static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
2399 {
2400 if (hcon->type != CIS_LINK && hcon->type != BIS_LINK &&
2401 hcon->type != PA_LINK) {
2402 if (hcon->type != LE_LINK)
2403 return;
2404
2405 /* Check if LE link has failed */
2406 if (status) {
2407 struct hci_link *link, *t;
2408
2409 list_for_each_entry_safe(link, t, &hcon->link_list,
2410 list)
2411 iso_conn_del(link->conn, bt_to_errno(status));
2412
2413 return;
2414 }
2415
2416 /* Create CIS if pending */
2417 hci_le_create_cis_pending(hcon->hdev);
2418 return;
2419 }
2420
2421 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
2422
2423 /* Similar to the success case, if HCI_CONN_BIG_SYNC_FAILED or
2424 * HCI_CONN_PA_SYNC_FAILED is set, queue the failed connection
2425 * into the accept queue of the listening socket and wake up
2426 * userspace, to inform the user about the event.
2427 */
2428 if (!status || test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags) ||
2429 test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
2430 struct iso_conn *conn;
2431
2432 conn = iso_conn_add(hcon);
2433 if (conn)
2434 iso_conn_ready(conn);
2435 } else {
2436 iso_conn_del(hcon, bt_to_errno(status));
2437 }
2438 }
2439
iso_disconn_cfm(struct hci_conn * hcon,__u8 reason)2440 static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
2441 {
2442 if (hcon->type != CIS_LINK && hcon->type != BIS_LINK &&
2443 hcon->type != PA_LINK)
2444 return;
2445
2446 BT_DBG("hcon %p reason %d", hcon, reason);
2447
2448 iso_conn_del(hcon, bt_to_errno(reason));
2449 }
2450
iso_recv(struct hci_dev * hdev,u16 handle,struct sk_buff * skb,u16 flags)2451 int iso_recv(struct hci_dev *hdev, u16 handle, struct sk_buff *skb, u16 flags)
2452 {
2453 struct hci_conn *hcon;
2454 struct iso_conn *conn;
2455 struct skb_shared_hwtstamps *hwts;
2456 __u16 pb, ts, len, sn;
2457
2458 hci_dev_lock(hdev);
2459
2460 hcon = hci_conn_hash_lookup_handle(hdev, handle);
2461 if (!hcon) {
2462 hci_dev_unlock(hdev);
2463 kfree_skb(skb);
2464 return -ENOENT;
2465 }
2466
2467 conn = iso_conn_hold_unless_zero(hcon->iso_data);
2468 hcon = NULL;
2469
2470 hci_dev_unlock(hdev);
2471
2472 if (!conn) {
2473 kfree_skb(skb);
2474 return -EINVAL;
2475 }
2476
2477 pb = hci_iso_flags_pb(flags);
2478 ts = hci_iso_flags_ts(flags);
2479
2480 BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);
2481
2482 switch (pb) {
2483 case ISO_START:
2484 case ISO_SINGLE:
2485 if (conn->rx_len) {
2486 BT_ERR("Unexpected start frame (len %d)", skb->len);
2487 kfree_skb(conn->rx_skb);
2488 conn->rx_skb = NULL;
2489 conn->rx_len = 0;
2490 }
2491
2492 if (ts) {
2493 struct hci_iso_ts_data_hdr *hdr;
2494
2495 hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
2496 if (!hdr) {
2497 BT_ERR("Frame is too short (len %d)", skb->len);
2498 goto drop;
2499 }
2500
2501 /* Record the timestamp to skb */
2502 hwts = skb_hwtstamps(skb);
2503 hwts->hwtstamp = us_to_ktime(le32_to_cpu(hdr->ts));
2504
2505 sn = __le16_to_cpu(hdr->sn);
2506 len = __le16_to_cpu(hdr->slen);
2507 } else {
2508 struct hci_iso_data_hdr *hdr;
2509
2510 hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
2511 if (!hdr) {
2512 BT_ERR("Frame is too short (len %d)", skb->len);
2513 goto drop;
2514 }
2515
2516 sn = __le16_to_cpu(hdr->sn);
2517 len = __le16_to_cpu(hdr->slen);
2518 }
2519
2520 flags = hci_iso_data_flags(len);
2521 len = hci_iso_data_len(len);
2522
2523 BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x sn %d",
2524 len, skb->len, flags, sn);
2525
2526 if (len == skb->len) {
2527 /* Complete frame received */
2528 hci_skb_pkt_status(skb) = flags & 0x03;
2529 hci_skb_pkt_seqnum(skb) = sn;
2530 iso_recv_frame(conn, skb);
2531 goto done;
2532 }
2533
2534 if (pb == ISO_SINGLE) {
2535 BT_ERR("Frame malformed (len %d, expected len %d)",
2536 skb->len, len);
2537 goto drop;
2538 }
2539
2540 if (skb->len > len) {
2541 BT_ERR("Frame is too long (len %d, expected len %d)",
2542 skb->len, len);
2543 goto drop;
2544 }
2545
2546 /* Allocate skb for the complete frame (with header) */
2547 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
2548 if (!conn->rx_skb)
2549 goto drop;
2550
2551 hci_skb_pkt_status(conn->rx_skb) = flags & 0x03;
2552 hci_skb_pkt_seqnum(conn->rx_skb) = sn;
2553 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2554 skb->len);
2555 conn->rx_len = len - skb->len;
2556
2557 /* Copy hw timestamp from skb to rx_skb if present */
2558 if (ts) {
2559 hwts = skb_hwtstamps(conn->rx_skb);
2560 hwts->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
2561 }
2562
2563 break;
2564
2565 case ISO_CONT:
2566 BT_DBG("Cont: frag len %d (expecting %d)", skb->len,
2567 conn->rx_len);
2568
2569 if (!conn->rx_len) {
2570 BT_ERR("Unexpected continuation frame (len %d)",
2571 skb->len);
2572 goto drop;
2573 }
2574
2575 if (skb->len > conn->rx_len) {
2576 BT_ERR("Fragment is too long (len %d, expected %d)",
2577 skb->len, conn->rx_len);
2578 kfree_skb(conn->rx_skb);
2579 conn->rx_skb = NULL;
2580 conn->rx_len = 0;
2581 goto drop;
2582 }
2583
2584 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2585 skb->len);
2586 conn->rx_len -= skb->len;
2587 break;
2588
2589 case ISO_END:
2590 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2591 skb->len);
2592 conn->rx_len -= skb->len;
2593
2594 if (!conn->rx_len) {
2595 struct sk_buff *rx_skb = conn->rx_skb;
2596
2597 /* Complete frame received. iso_recv_frame
2598 * takes ownership of the skb so set the global
2599 * rx_skb pointer to NULL first.
2600 */
2601 conn->rx_skb = NULL;
2602 iso_recv_frame(conn, rx_skb);
2603 }
2604 break;
2605 }
2606
2607 drop:
2608 kfree_skb(skb);
2609 done:
2610 iso_conn_put(conn);
2611 return 0;
2612 }
2613
2614 static struct hci_cb iso_cb = {
2615 .name = "ISO",
2616 .connect_cfm = iso_connect_cfm,
2617 .disconn_cfm = iso_disconn_cfm,
2618 };
2619
iso_debugfs_show(struct seq_file * f,void * p)2620 static int iso_debugfs_show(struct seq_file *f, void *p)
2621 {
2622 struct sock *sk;
2623
2624 read_lock(&iso_sk_list.lock);
2625
2626 sk_for_each(sk, &iso_sk_list.head) {
2627 seq_printf(f, "%pMR %pMR %d\n", &iso_pi(sk)->src,
2628 &iso_pi(sk)->dst, sk->sk_state);
2629 }
2630
2631 read_unlock(&iso_sk_list.lock);
2632
2633 return 0;
2634 }
2635
2636 DEFINE_SHOW_ATTRIBUTE(iso_debugfs);
2637
2638 static struct dentry *iso_debugfs;
2639
2640 static const struct proto_ops iso_sock_ops = {
2641 .family = PF_BLUETOOTH,
2642 .owner = THIS_MODULE,
2643 .release = iso_sock_release,
2644 .bind = iso_sock_bind,
2645 .connect = iso_sock_connect,
2646 .listen = iso_sock_listen,
2647 .accept = iso_sock_accept,
2648 .getname = iso_sock_getname,
2649 .sendmsg = iso_sock_sendmsg,
2650 .recvmsg = iso_sock_recvmsg,
2651 .poll = bt_sock_poll,
2652 .ioctl = bt_sock_ioctl,
2653 .mmap = sock_no_mmap,
2654 .socketpair = sock_no_socketpair,
2655 .shutdown = iso_sock_shutdown,
2656 .setsockopt = iso_sock_setsockopt,
2657 .getsockopt = iso_sock_getsockopt
2658 };
2659
2660 static const struct net_proto_family iso_sock_family_ops = {
2661 .family = PF_BLUETOOTH,
2662 .owner = THIS_MODULE,
2663 .create = iso_sock_create,
2664 };
2665
2666 static bool inited;
2667
iso_inited(void)2668 bool iso_inited(void)
2669 {
2670 return inited;
2671 }
2672
iso_init(void)2673 int iso_init(void)
2674 {
2675 int err;
2676
2677 BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr));
2678
2679 if (inited)
2680 return -EALREADY;
2681
2682 err = proto_register(&iso_proto, 0);
2683 if (err < 0)
2684 return err;
2685
2686 err = bt_sock_register(BTPROTO_ISO, &iso_sock_family_ops);
2687 if (err < 0) {
2688 BT_ERR("ISO socket registration failed");
2689 goto error;
2690 }
2691
2692 err = bt_procfs_init(&init_net, "iso", &iso_sk_list, NULL);
2693 if (err < 0) {
2694 BT_ERR("Failed to create ISO proc file");
2695 bt_sock_unregister(BTPROTO_ISO);
2696 goto error;
2697 }
2698
2699 BT_INFO("ISO socket layer initialized");
2700
2701 hci_register_cb(&iso_cb);
2702
2703 if (!IS_ERR_OR_NULL(bt_debugfs))
2704 iso_debugfs = debugfs_create_file("iso", 0444, bt_debugfs,
2705 NULL, &iso_debugfs_fops);
2706
2707 inited = true;
2708
2709 return 0;
2710
2711 error:
2712 proto_unregister(&iso_proto);
2713 return err;
2714 }
2715
iso_exit(void)2716 int iso_exit(void)
2717 {
2718 if (!inited)
2719 return -EALREADY;
2720
2721 bt_procfs_cleanup(&init_net, "iso");
2722
2723 debugfs_remove(iso_debugfs);
2724 iso_debugfs = NULL;
2725
2726 hci_unregister_cb(&iso_cb);
2727
2728 bt_sock_unregister(BTPROTO_ISO);
2729
2730 proto_unregister(&iso_proto);
2731
2732 inited = false;
2733
2734 return 0;
2735 }
2736