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 lock_sock(sk);
351
352 if (!bis_capable(hdev)) {
353 err = -EOPNOTSUPP;
354 goto unlock;
355 }
356
357 /* Fail if user set invalid QoS */
358 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(&iso_pi(sk)->qos)) {
359 iso_pi(sk)->qos = default_qos;
360 err = -EINVAL;
361 goto unlock;
362 }
363
364 /* Fail if out PHYs are marked as disabled */
365 if (!iso_pi(sk)->qos.bcast.out.phys) {
366 err = -EINVAL;
367 goto unlock;
368 }
369
370 /* Just bind if DEFER_SETUP has been set */
371 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
372 hcon = hci_bind_bis(hdev, &iso_pi(sk)->dst, iso_pi(sk)->bc_sid,
373 &iso_pi(sk)->qos, iso_pi(sk)->base_len,
374 iso_pi(sk)->base,
375 READ_ONCE(sk->sk_sndtimeo));
376 if (IS_ERR(hcon)) {
377 err = PTR_ERR(hcon);
378 goto unlock;
379 }
380 } else {
381 hcon = hci_connect_bis(hdev, &iso_pi(sk)->dst,
382 le_addr_type(iso_pi(sk)->dst_type),
383 iso_pi(sk)->bc_sid, &iso_pi(sk)->qos,
384 iso_pi(sk)->base_len, iso_pi(sk)->base,
385 READ_ONCE(sk->sk_sndtimeo));
386 if (IS_ERR(hcon)) {
387 err = PTR_ERR(hcon);
388 goto unlock;
389 }
390
391 /* Update SID if it was not set */
392 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID)
393 iso_pi(sk)->bc_sid = hcon->sid;
394 }
395
396 conn = iso_conn_add(hcon);
397 if (!conn) {
398 hci_conn_drop(hcon);
399 err = -ENOMEM;
400 goto unlock;
401 }
402
403 err = iso_chan_add(conn, sk, NULL);
404 if (err)
405 goto unlock;
406
407 /* Update source addr of the socket */
408 bacpy(&iso_pi(sk)->src, &hcon->src);
409
410 if (hcon->state == BT_CONNECTED) {
411 iso_sock_clear_timer(sk);
412 sk->sk_state = BT_CONNECTED;
413 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
414 iso_sock_clear_timer(sk);
415 sk->sk_state = BT_CONNECT;
416 } else {
417 sk->sk_state = BT_CONNECT;
418 iso_sock_set_timer(sk, READ_ONCE(sk->sk_sndtimeo));
419 }
420
421 unlock:
422 release_sock(sk);
423 hci_dev_unlock(hdev);
424 hci_dev_put(hdev);
425 return err;
426 }
427
iso_connect_cis(struct sock * sk)428 static int iso_connect_cis(struct sock *sk)
429 {
430 struct iso_conn *conn;
431 struct hci_conn *hcon;
432 struct hci_dev *hdev;
433 int err;
434
435 BT_DBG("%pMR -> %pMR", &iso_pi(sk)->src, &iso_pi(sk)->dst);
436
437 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
438 iso_pi(sk)->src_type);
439 if (!hdev)
440 return -EHOSTUNREACH;
441
442 hci_dev_lock(hdev);
443 lock_sock(sk);
444
445 if (!cis_central_capable(hdev)) {
446 err = -EOPNOTSUPP;
447 goto unlock;
448 }
449
450 /* Fail if user set invalid QoS */
451 if (iso_pi(sk)->qos_user_set && !check_ucast_qos(&iso_pi(sk)->qos)) {
452 iso_pi(sk)->qos = default_qos;
453 err = -EINVAL;
454 goto unlock;
455 }
456
457 /* Fail if either PHYs are marked as disabled */
458 if (!iso_pi(sk)->qos.ucast.in.phys && !iso_pi(sk)->qos.ucast.out.phys) {
459 err = -EINVAL;
460 goto unlock;
461 }
462
463 /* Check if there are available buffers for output/TX. */
464 if (iso_pi(sk)->qos.ucast.out.sdu && !hci_iso_count(hdev) &&
465 (hdev->iso_pkts && !hdev->iso_cnt)) {
466 err = -ENOBUFS;
467 goto unlock;
468 }
469
470 /* Just bind if DEFER_SETUP has been set */
471 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
472 hcon = hci_bind_cis(hdev, &iso_pi(sk)->dst,
473 le_addr_type(iso_pi(sk)->dst_type),
474 &iso_pi(sk)->qos,
475 READ_ONCE(sk->sk_sndtimeo));
476 if (IS_ERR(hcon)) {
477 err = PTR_ERR(hcon);
478 goto unlock;
479 }
480 } else {
481 hcon = hci_connect_cis(hdev, &iso_pi(sk)->dst,
482 le_addr_type(iso_pi(sk)->dst_type),
483 &iso_pi(sk)->qos,
484 READ_ONCE(sk->sk_sndtimeo));
485 if (IS_ERR(hcon)) {
486 err = PTR_ERR(hcon);
487 goto unlock;
488 }
489 }
490
491 conn = iso_conn_add(hcon);
492 if (!conn) {
493 hci_conn_drop(hcon);
494 err = -ENOMEM;
495 goto unlock;
496 }
497
498 err = iso_chan_add(conn, sk, NULL);
499 if (err)
500 goto unlock;
501
502 /* Update source addr of the socket */
503 bacpy(&iso_pi(sk)->src, &hcon->src);
504
505 if (hcon->state == BT_CONNECTED) {
506 iso_sock_clear_timer(sk);
507 sk->sk_state = BT_CONNECTED;
508 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
509 iso_sock_clear_timer(sk);
510 sk->sk_state = BT_CONNECT;
511 } else {
512 sk->sk_state = BT_CONNECT;
513 iso_sock_set_timer(sk, READ_ONCE(sk->sk_sndtimeo));
514 }
515
516 unlock:
517 release_sock(sk);
518 hci_dev_unlock(hdev);
519 hci_dev_put(hdev);
520 return err;
521 }
522
iso_sock_get_qos(struct sock * sk)523 static struct bt_iso_qos *iso_sock_get_qos(struct sock *sk)
524 {
525 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
526 return &iso_pi(sk)->conn->hcon->iso_qos;
527
528 return &iso_pi(sk)->qos;
529 }
530
iso_send_frame(struct sock * sk,struct sk_buff * skb,const struct sockcm_cookie * sockc)531 static int iso_send_frame(struct sock *sk, struct sk_buff *skb,
532 const struct sockcm_cookie *sockc)
533 {
534 struct iso_conn *conn = iso_pi(sk)->conn;
535 struct bt_iso_qos *qos = iso_sock_get_qos(sk);
536 struct hci_iso_data_hdr *hdr;
537 int len = 0;
538
539 BT_DBG("sk %p len %d", sk, skb->len);
540
541 if (skb->len > qos->ucast.out.sdu)
542 return -EMSGSIZE;
543
544 len = skb->len;
545
546 /* Push ISO data header */
547 hdr = skb_push(skb, HCI_ISO_DATA_HDR_SIZE);
548 hdr->sn = cpu_to_le16(conn->tx_sn++);
549 hdr->slen = cpu_to_le16(hci_iso_data_len_pack(len,
550 HCI_ISO_STATUS_VALID));
551
552 if (sk->sk_state == BT_CONNECTED) {
553 hci_setup_tx_timestamp(skb, 1, sockc);
554 hci_send_iso(conn->hcon, skb);
555 } else {
556 len = -ENOTCONN;
557 }
558
559 return len;
560 }
561
iso_recv_frame(struct iso_conn * conn,struct sk_buff * skb)562 static void iso_recv_frame(struct iso_conn *conn, struct sk_buff *skb)
563 {
564 struct sock *sk;
565
566 iso_conn_lock(conn);
567 sk = iso_sock_hold(conn);
568 iso_conn_unlock(conn);
569
570 if (!sk)
571 goto drop;
572
573 BT_DBG("sk %p len %d", sk, skb->len);
574
575 if (sk->sk_state != BT_CONNECTED)
576 goto drop_put;
577
578 if (!sock_queue_rcv_skb(sk, skb)) {
579 sock_put(sk);
580 return;
581 }
582
583 drop_put:
584 sock_put(sk);
585 drop:
586 kfree_skb(skb);
587 }
588
589 /* -------- Socket interface ---------- */
__iso_get_sock_listen_by_addr(bdaddr_t * src,bdaddr_t * dst)590 static struct sock *__iso_get_sock_listen_by_addr(bdaddr_t *src, bdaddr_t *dst)
591 {
592 struct sock *sk;
593
594 sk_for_each(sk, &iso_sk_list.head) {
595 if (sk->sk_state != BT_LISTEN)
596 continue;
597
598 if (bacmp(&iso_pi(sk)->dst, dst))
599 continue;
600
601 if (!bacmp(&iso_pi(sk)->src, src))
602 return sk;
603 }
604
605 return NULL;
606 }
607
__iso_get_sock_listen_by_sid(bdaddr_t * ba,bdaddr_t * bc,__u8 sid)608 static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
609 __u8 sid)
610 {
611 struct sock *sk;
612
613 sk_for_each(sk, &iso_sk_list.head) {
614 if (sk->sk_state != BT_LISTEN)
615 continue;
616
617 if (bacmp(&iso_pi(sk)->src, ba))
618 continue;
619
620 if (bacmp(&iso_pi(sk)->dst, bc))
621 continue;
622
623 if (iso_pi(sk)->bc_sid == sid)
624 return sk;
625 }
626
627 return NULL;
628 }
629
630 /* Find socket in given state:
631 * source bdaddr (Unicast)
632 * destination bdaddr (Broadcast only)
633 * match func - pass NULL to ignore
634 * match func data - pass -1 to ignore
635 * Returns closest match.
636 */
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)637 static struct sock *iso_get_sock(struct hci_dev *hdev, bdaddr_t *src,
638 bdaddr_t *dst, enum bt_sock_state state,
639 iso_sock_match_t match, void *data)
640 {
641 struct sock *sk = NULL, *sk1 = NULL;
642
643 read_lock(&iso_sk_list.lock);
644
645 sk_for_each(sk, &iso_sk_list.head) {
646 if (sk->sk_state != state)
647 continue;
648
649 /* Match Broadcast destination */
650 if (bacmp(dst, BDADDR_ANY) && bacmp(&iso_pi(sk)->dst, dst)) {
651 struct smp_irk *irk1, *irk2;
652
653 /* Check if destination is an RPA that we can resolve */
654 irk1 = hci_find_irk_by_rpa(hdev, dst);
655 if (!irk1)
656 continue;
657
658 /* Match with identity address */
659 if (bacmp(&iso_pi(sk)->dst, &irk1->bdaddr)) {
660 /* Check if socket destination address is also
661 * an RPA and if the IRK matches.
662 */
663 irk2 = hci_find_irk_by_rpa(hdev,
664 &iso_pi(sk)->dst);
665 if (!irk2 || irk1 != irk2)
666 continue;
667 }
668 }
669
670 /* Use Match function if provided */
671 if (match && !match(sk, data))
672 continue;
673
674 /* Exact match. */
675 if (!bacmp(&iso_pi(sk)->src, src)) {
676 sock_hold(sk);
677 break;
678 }
679
680 /* Closest match */
681 if (!bacmp(&iso_pi(sk)->src, BDADDR_ANY)) {
682 if (sk1)
683 sock_put(sk1);
684
685 sk1 = sk;
686 sock_hold(sk1);
687 }
688 }
689
690 if (sk && sk1)
691 sock_put(sk1);
692
693 read_unlock(&iso_sk_list.lock);
694
695 return sk ? sk : sk1;
696 }
697
iso_get_sock_big(struct sock * match_sk,bdaddr_t * src,bdaddr_t * dst,uint8_t big)698 static struct sock *iso_get_sock_big(struct sock *match_sk, bdaddr_t *src,
699 bdaddr_t *dst, uint8_t big)
700 {
701 struct sock *sk = NULL;
702
703 read_lock(&iso_sk_list.lock);
704
705 sk_for_each(sk, &iso_sk_list.head) {
706 if (match_sk == sk)
707 continue;
708
709 /* Look for sockets that have already been
710 * connected to the BIG
711 */
712 if (sk->sk_state != BT_CONNECTED &&
713 sk->sk_state != BT_CONNECT)
714 continue;
715
716 /* Match Broadcast destination */
717 if (bacmp(&iso_pi(sk)->dst, dst))
718 continue;
719
720 /* Match BIG handle */
721 if (iso_pi(sk)->qos.bcast.big != big)
722 continue;
723
724 /* Match source address */
725 if (bacmp(&iso_pi(sk)->src, src))
726 continue;
727
728 sock_hold(sk);
729 break;
730 }
731
732 read_unlock(&iso_sk_list.lock);
733
734 return sk;
735 }
736
iso_sock_destruct(struct sock * sk)737 static void iso_sock_destruct(struct sock *sk)
738 {
739 BT_DBG("sk %p", sk);
740
741 iso_conn_put(iso_pi(sk)->conn);
742
743 skb_queue_purge(&sk->sk_receive_queue);
744 skb_queue_purge(&sk->sk_write_queue);
745 skb_queue_purge(&sk->sk_error_queue);
746 }
747
iso_sock_cleanup_listen(struct sock * parent)748 static void iso_sock_cleanup_listen(struct sock *parent)
749 {
750 struct sock *sk;
751
752 BT_DBG("parent %p", parent);
753
754 /* Close not yet accepted channels */
755 while ((sk = bt_accept_dequeue(parent, NULL))) {
756 iso_sock_close(sk);
757 iso_sock_kill(sk);
758 /* Drop the reference handed back by bt_accept_dequeue(). */
759 sock_put(sk);
760 }
761
762 /* If listening socket has a hcon, properly disconnect it */
763 if (iso_pi(parent)->conn && iso_pi(parent)->conn->hcon) {
764 iso_sock_disconn(parent);
765 return;
766 }
767
768 parent->sk_state = BT_CLOSED;
769 sock_set_flag(parent, SOCK_ZAPPED);
770 }
771
772 /* Kill socket (only if zapped and orphan)
773 * Must be called on unlocked socket.
774 */
iso_sock_kill(struct sock * sk)775 static void iso_sock_kill(struct sock *sk)
776 {
777 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||
778 sock_flag(sk, SOCK_DEAD))
779 return;
780
781 BT_DBG("sk %p state %d", sk, sk->sk_state);
782
783 /* Sock is dead, so set conn->sk to NULL to avoid possible UAF */
784 if (iso_pi(sk)->conn) {
785 iso_conn_lock(iso_pi(sk)->conn);
786 iso_pi(sk)->conn->sk = NULL;
787 iso_conn_unlock(iso_pi(sk)->conn);
788 }
789
790 /* Kill poor orphan */
791 bt_sock_unlink(&iso_sk_list, sk);
792 sock_set_flag(sk, SOCK_DEAD);
793 sock_put(sk);
794 }
795
iso_sock_disconn(struct sock * sk)796 static void iso_sock_disconn(struct sock *sk)
797 {
798 struct sock *bis_sk;
799 struct hci_conn *hcon = iso_pi(sk)->conn->hcon;
800
801 if (test_bit(HCI_CONN_BIG_CREATED, &hcon->flags)) {
802 bis_sk = iso_get_sock_big(sk, &iso_pi(sk)->src,
803 &iso_pi(sk)->dst,
804 iso_pi(sk)->qos.bcast.big);
805
806 /* If there are any other connected sockets for the
807 * same BIG, just delete the sk and leave the bis
808 * hcon active, in case later rebinding is needed.
809 */
810 if (bis_sk) {
811 hcon->state = BT_OPEN;
812 hcon->iso_data = NULL;
813 iso_pi(sk)->conn->hcon = NULL;
814 iso_sock_clear_timer(sk);
815 iso_chan_del(sk, bt_to_errno(hcon->abort_reason));
816 sock_put(bis_sk);
817 return;
818 }
819 }
820
821 sk->sk_state = BT_DISCONN;
822 iso_conn_lock(iso_pi(sk)->conn);
823 hci_conn_drop(iso_pi(sk)->conn->hcon);
824 iso_pi(sk)->conn->hcon = NULL;
825 iso_conn_unlock(iso_pi(sk)->conn);
826 }
827
__iso_sock_close(struct sock * sk)828 static void __iso_sock_close(struct sock *sk)
829 {
830 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
831
832 switch (sk->sk_state) {
833 case BT_LISTEN:
834 iso_sock_cleanup_listen(sk);
835 break;
836
837 case BT_CONNECT:
838 case BT_CONNECTED:
839 case BT_CONFIG:
840 if (iso_pi(sk)->conn->hcon)
841 iso_sock_disconn(sk);
842 else
843 iso_chan_del(sk, ECONNRESET);
844 break;
845
846 case BT_CONNECT2:
847 if (iso_pi(sk)->conn->hcon &&
848 (test_bit(HCI_CONN_PA_SYNC, &iso_pi(sk)->conn->hcon->flags) ||
849 test_bit(HCI_CONN_PA_SYNC_FAILED, &iso_pi(sk)->conn->hcon->flags)))
850 iso_sock_disconn(sk);
851 else
852 iso_chan_del(sk, ECONNRESET);
853 break;
854 case BT_DISCONN:
855 iso_chan_del(sk, ECONNRESET);
856 break;
857
858 default:
859 sock_set_flag(sk, SOCK_ZAPPED);
860 break;
861 }
862 }
863
864 /* Must be called on unlocked socket. */
iso_sock_close(struct sock * sk)865 static void iso_sock_close(struct sock *sk)
866 {
867 lock_sock(sk);
868 iso_sock_clear_timer(sk);
869 __iso_sock_close(sk);
870 release_sock(sk);
871 iso_sock_kill(sk);
872 }
873
iso_sock_init(struct sock * sk,struct sock * parent)874 static void iso_sock_init(struct sock *sk, struct sock *parent)
875 {
876 BT_DBG("sk %p", sk);
877
878 if (parent) {
879 sk->sk_type = parent->sk_type;
880 bt_sk(sk)->flags = bt_sk(parent)->flags;
881 security_sk_clone(parent, sk);
882 }
883 }
884
885 static struct proto iso_proto = {
886 .name = "ISO",
887 .owner = THIS_MODULE,
888 .obj_size = sizeof(struct iso_pinfo)
889 };
890
891 #define DEFAULT_IO_QOS \
892 { \
893 .interval = 10000u, \
894 .latency = 10u, \
895 .sdu = 40u, \
896 .phys = BT_ISO_PHY_2M, \
897 .rtn = 2u, \
898 }
899
900 static struct bt_iso_qos default_qos = {
901 .bcast = {
902 .big = BT_ISO_QOS_BIG_UNSET,
903 .bis = BT_ISO_QOS_BIS_UNSET,
904 .sync_factor = 0x01,
905 .packing = 0x00,
906 .framing = 0x00,
907 .in = DEFAULT_IO_QOS,
908 .out = DEFAULT_IO_QOS,
909 .encryption = 0x00,
910 .bcode = {0x00},
911 .options = 0x00,
912 .skip = 0x0000,
913 .sync_timeout = BT_ISO_SYNC_TIMEOUT,
914 .sync_cte_type = 0x00,
915 .mse = 0x00,
916 .timeout = BT_ISO_SYNC_TIMEOUT,
917 },
918 };
919
iso_sock_alloc(struct net * net,struct socket * sock,int proto,gfp_t prio,int kern)920 static struct sock *iso_sock_alloc(struct net *net, struct socket *sock,
921 int proto, gfp_t prio, int kern)
922 {
923 struct sock *sk;
924
925 sk = bt_sock_alloc(net, sock, &iso_proto, proto, prio, kern);
926 if (!sk)
927 return NULL;
928
929 sk->sk_destruct = iso_sock_destruct;
930 sk->sk_sndtimeo = ISO_CONN_TIMEOUT;
931
932 /* Set address type as public as default src address is BDADDR_ANY */
933 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
934
935 iso_pi(sk)->qos = default_qos;
936 iso_pi(sk)->sync_handle = -1;
937
938 bt_sock_link(&iso_sk_list, sk);
939 return sk;
940 }
941
iso_sock_create(struct net * net,struct socket * sock,int protocol,int kern)942 static int iso_sock_create(struct net *net, struct socket *sock, int protocol,
943 int kern)
944 {
945 struct sock *sk;
946
947 BT_DBG("sock %p", sock);
948
949 sock->state = SS_UNCONNECTED;
950
951 if (sock->type != SOCK_SEQPACKET)
952 return -ESOCKTNOSUPPORT;
953
954 sock->ops = &iso_sock_ops;
955
956 sk = iso_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
957 if (!sk)
958 return -ENOMEM;
959
960 iso_sock_init(sk, NULL);
961 return 0;
962 }
963
iso_sock_bind_bc(struct socket * sock,struct sockaddr_unsized * addr,int addr_len)964 static int iso_sock_bind_bc(struct socket *sock, struct sockaddr_unsized *addr,
965 int addr_len)
966 {
967 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
968 struct sock *sk = sock->sk;
969 int i;
970
971 BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid,
972 sa->iso_bc->bc_num_bis);
973
974 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc))
975 return -EINVAL;
976
977 bacpy(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr);
978
979 /* Check if the address type is of LE type */
980 if (!bdaddr_type_is_le(sa->iso_bc->bc_bdaddr_type))
981 return -EINVAL;
982
983 iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
984
985 if (sa->iso_bc->bc_sid > 0x0f && sa->iso_bc->bc_sid != HCI_SID_INVALID)
986 return -EINVAL;
987
988 iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
989
990 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS)
991 return -EINVAL;
992
993 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
994
995 for (i = 0; i < iso_pi(sk)->bc_num_bis; i++)
996 if (sa->iso_bc->bc_bis[i] < 0x01 ||
997 sa->iso_bc->bc_bis[i] > 0x1f)
998 return -EINVAL;
999
1000 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
1001 iso_pi(sk)->bc_num_bis);
1002
1003 return 0;
1004 }
1005
1006 /* Must be called on the locked socket. */
iso_sock_rebind_bis(struct sock * sk,struct sockaddr_iso * sa,int addr_len)1007 static int iso_sock_rebind_bis(struct sock *sk, struct sockaddr_iso *sa,
1008 int addr_len)
1009 {
1010 int err = 0;
1011
1012 if (!test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags))
1013 return -EBADFD;
1014
1015 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS) {
1016 err = -EINVAL;
1017 goto done;
1018 }
1019
1020 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
1021
1022 for (int i = 0; i < iso_pi(sk)->bc_num_bis; i++)
1023 if (sa->iso_bc->bc_bis[i] < 0x01 ||
1024 sa->iso_bc->bc_bis[i] > 0x1f) {
1025 err = -EINVAL;
1026 goto done;
1027 }
1028
1029 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
1030 iso_pi(sk)->bc_num_bis);
1031
1032 done:
1033 return err;
1034 }
1035
iso_conn_get_hdev(struct iso_conn * conn)1036 static struct hci_dev *iso_conn_get_hdev(struct iso_conn *conn)
1037 {
1038 struct hci_dev *hdev = NULL;
1039
1040 iso_conn_lock(conn);
1041 if (conn->hcon)
1042 hdev = hci_dev_hold(conn->hcon->hdev);
1043 iso_conn_unlock(conn);
1044
1045 return hdev;
1046 }
1047
1048 /* Must be called on the locked socket. */
iso_sock_rebind_bc(struct sock * sk,struct sockaddr_iso * sa,int addr_len)1049 static int iso_sock_rebind_bc(struct sock *sk, struct sockaddr_iso *sa,
1050 int addr_len)
1051 {
1052 struct hci_dev *hdev;
1053 struct hci_conn *bis;
1054 int err;
1055
1056 if (sk->sk_type != SOCK_SEQPACKET || !iso_pi(sk)->conn)
1057 return -EINVAL;
1058
1059 /* Check if it is really a Broadcast address being requested */
1060 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc))
1061 return -EINVAL;
1062
1063 /* Check if the address hasn't changed then perhaps only the number of
1064 * bis has changed.
1065 */
1066 if (!bacmp(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr) ||
1067 !bacmp(&sa->iso_bc->bc_bdaddr, BDADDR_ANY))
1068 return iso_sock_rebind_bis(sk, sa, addr_len);
1069
1070 /* Check if the address type is of LE type */
1071 if (!bdaddr_type_is_le(sa->iso_bc->bc_bdaddr_type))
1072 return -EINVAL;
1073
1074 hdev = iso_conn_get_hdev(iso_pi(sk)->conn);
1075 if (!hdev)
1076 return -EINVAL;
1077
1078 bis = iso_pi(sk)->conn->hcon;
1079
1080 /* Release the socket before lookups since that requires hci_dev_lock
1081 * which shall not be acquired while holding sock_lock for proper
1082 * ordering.
1083 */
1084 release_sock(sk);
1085 hci_dev_lock(bis->hdev);
1086 lock_sock(sk);
1087
1088 if (!iso_pi(sk)->conn || iso_pi(sk)->conn->hcon != bis) {
1089 /* raced with iso_conn_del() or iso_disconn_sock() */
1090 err = -ENOTCONN;
1091 goto unlock;
1092 }
1093
1094 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bc->bc_bdaddr,
1095 sa->iso_bc->bc_bdaddr_type);
1096
1097 err = hci_past_bis(bis, &sa->iso_bc->bc_bdaddr,
1098 le_addr_type(sa->iso_bc->bc_bdaddr_type));
1099
1100 unlock:
1101 hci_dev_unlock(hdev);
1102 hci_dev_put(hdev);
1103
1104 return err;
1105 }
1106
iso_sock_bind(struct socket * sock,struct sockaddr_unsized * addr,int addr_len)1107 static int iso_sock_bind(struct socket *sock, struct sockaddr_unsized *addr,
1108 int addr_len)
1109 {
1110 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1111 struct sock *sk = sock->sk;
1112 int err = 0;
1113
1114 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type);
1115
1116 if (!addr || addr_len < sizeof(struct sockaddr_iso) ||
1117 addr->sa_family != AF_BLUETOOTH)
1118 return -EINVAL;
1119
1120 lock_sock(sk);
1121
1122 if ((sk->sk_state == BT_CONNECT2 || sk->sk_state == BT_CONNECTED) &&
1123 addr_len > sizeof(*sa)) {
1124 /* Allow the user to rebind to a different address using
1125 * PAST procedures.
1126 */
1127 err = iso_sock_rebind_bc(sk, sa, addr_len);
1128 goto done;
1129 }
1130
1131 if (sk->sk_state != BT_OPEN) {
1132 err = -EBADFD;
1133 goto done;
1134 }
1135
1136 if (sk->sk_type != SOCK_SEQPACKET) {
1137 err = -EINVAL;
1138 goto done;
1139 }
1140
1141 /* Check if the address type is of LE type */
1142 if (!bdaddr_type_is_le(sa->iso_bdaddr_type)) {
1143 err = -EINVAL;
1144 goto done;
1145 }
1146
1147 bacpy(&iso_pi(sk)->src, &sa->iso_bdaddr);
1148 iso_pi(sk)->src_type = sa->iso_bdaddr_type;
1149
1150 /* Check for Broadcast address */
1151 if (addr_len > sizeof(*sa)) {
1152 err = iso_sock_bind_bc(sock, addr, addr_len);
1153 if (err)
1154 goto done;
1155 }
1156
1157 sk->sk_state = BT_BOUND;
1158
1159 done:
1160 release_sock(sk);
1161 return err;
1162 }
1163
iso_sock_connect(struct socket * sock,struct sockaddr_unsized * addr,int alen,int flags)1164 static int iso_sock_connect(struct socket *sock, struct sockaddr_unsized *addr,
1165 int alen, int flags)
1166 {
1167 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1168 struct sock *sk = sock->sk;
1169 int err;
1170
1171 BT_DBG("sk %p", sk);
1172
1173 if (alen < sizeof(struct sockaddr_iso) ||
1174 addr->sa_family != AF_BLUETOOTH)
1175 return -EINVAL;
1176
1177 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
1178 return -EBADFD;
1179
1180 if (sk->sk_type != SOCK_SEQPACKET)
1181 return -EINVAL;
1182
1183 /* Check if the address type is of LE type */
1184 if (!bdaddr_type_is_le(sa->iso_bdaddr_type))
1185 return -EINVAL;
1186
1187 lock_sock(sk);
1188
1189 bacpy(&iso_pi(sk)->dst, &sa->iso_bdaddr);
1190 iso_pi(sk)->dst_type = sa->iso_bdaddr_type;
1191
1192 release_sock(sk);
1193
1194 if (bacmp(&sa->iso_bdaddr, BDADDR_ANY))
1195 err = iso_connect_cis(sk);
1196 else
1197 err = iso_connect_bis(sk);
1198
1199 if (err)
1200 return err;
1201
1202 lock_sock(sk);
1203
1204 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1205 err = bt_sock_wait_state(sk, BT_CONNECTED,
1206 sock_sndtimeo(sk, flags & O_NONBLOCK));
1207 }
1208
1209 release_sock(sk);
1210 return err;
1211 }
1212
iso_listen_bis(struct sock * sk)1213 static int iso_listen_bis(struct sock *sk)
1214 {
1215 struct hci_dev *hdev;
1216 int err = 0;
1217 struct iso_conn *conn;
1218 struct hci_conn *hcon;
1219
1220 BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &iso_pi(sk)->src,
1221 &iso_pi(sk)->dst, iso_pi(sk)->bc_sid);
1222
1223 write_lock(&iso_sk_list.lock);
1224
1225 if (__iso_get_sock_listen_by_sid(&iso_pi(sk)->src, &iso_pi(sk)->dst,
1226 iso_pi(sk)->bc_sid))
1227 err = -EADDRINUSE;
1228
1229 write_unlock(&iso_sk_list.lock);
1230
1231 if (err)
1232 return err;
1233
1234 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
1235 iso_pi(sk)->src_type);
1236 if (!hdev)
1237 return -EHOSTUNREACH;
1238
1239 hci_dev_lock(hdev);
1240 lock_sock(sk);
1241
1242 /* Fail if user set invalid QoS */
1243 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(&iso_pi(sk)->qos)) {
1244 iso_pi(sk)->qos = default_qos;
1245 err = -EINVAL;
1246 goto unlock;
1247 }
1248
1249 hcon = hci_pa_create_sync(hdev, &iso_pi(sk)->dst,
1250 le_addr_type(iso_pi(sk)->dst_type),
1251 iso_pi(sk)->bc_sid, &iso_pi(sk)->qos);
1252 if (IS_ERR(hcon)) {
1253 err = PTR_ERR(hcon);
1254 goto unlock;
1255 }
1256
1257 conn = iso_conn_add(hcon);
1258 if (!conn) {
1259 hci_conn_drop(hcon);
1260 err = -ENOMEM;
1261 goto unlock;
1262 }
1263
1264 err = iso_chan_add(conn, sk, NULL);
1265 if (err) {
1266 hci_conn_drop(hcon);
1267 goto unlock;
1268 }
1269
1270 unlock:
1271 release_sock(sk);
1272 hci_dev_unlock(hdev);
1273 hci_dev_put(hdev);
1274 return err;
1275 }
1276
iso_listen_cis(struct sock * sk)1277 static int iso_listen_cis(struct sock *sk)
1278 {
1279 int err = 0;
1280
1281 BT_DBG("%pMR", &iso_pi(sk)->src);
1282
1283 write_lock(&iso_sk_list.lock);
1284
1285 if (__iso_get_sock_listen_by_addr(&iso_pi(sk)->src, &iso_pi(sk)->dst))
1286 err = -EADDRINUSE;
1287
1288 write_unlock(&iso_sk_list.lock);
1289
1290 return err;
1291 }
1292
iso_sock_listen(struct socket * sock,int backlog)1293 static int iso_sock_listen(struct socket *sock, int backlog)
1294 {
1295 struct sock *sk = sock->sk;
1296 int err = 0;
1297
1298 BT_DBG("sk %p backlog %d", sk, backlog);
1299
1300 sock_hold(sk);
1301 lock_sock(sk);
1302
1303 if (sk->sk_state != BT_BOUND) {
1304 err = -EBADFD;
1305 goto done;
1306 }
1307
1308 if (sk->sk_type != SOCK_SEQPACKET) {
1309 err = -EINVAL;
1310 goto done;
1311 }
1312
1313 if (!bacmp(&iso_pi(sk)->dst, BDADDR_ANY)) {
1314 err = iso_listen_cis(sk);
1315 } else {
1316 /* Drop sock lock to avoid potential
1317 * deadlock with the hdev lock.
1318 */
1319 release_sock(sk);
1320 err = iso_listen_bis(sk);
1321 lock_sock(sk);
1322 }
1323
1324 if (err)
1325 goto done;
1326
1327 sk->sk_max_ack_backlog = backlog;
1328 sk->sk_ack_backlog = 0;
1329
1330 sk->sk_state = BT_LISTEN;
1331
1332 done:
1333 release_sock(sk);
1334 sock_put(sk);
1335 return err;
1336 }
1337
iso_sock_accept(struct socket * sock,struct socket * newsock,struct proto_accept_arg * arg)1338 static int iso_sock_accept(struct socket *sock, struct socket *newsock,
1339 struct proto_accept_arg *arg)
1340 {
1341 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1342 struct sock *sk = sock->sk, *ch;
1343 long timeo;
1344 int err = 0;
1345
1346 /* Use explicit nested locking to avoid lockdep warnings generated
1347 * because the parent socket and the child socket are locked on the
1348 * same thread.
1349 */
1350 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1351
1352 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
1353
1354 BT_DBG("sk %p timeo %ld", sk, timeo);
1355
1356 /* Wait for an incoming connection. (wake-one). */
1357 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1358 while (1) {
1359 if (sk->sk_state != BT_LISTEN) {
1360 err = -EBADFD;
1361 break;
1362 }
1363
1364 ch = bt_accept_dequeue(sk, newsock);
1365 if (ch) {
1366 /* Drop the bridging ref from bt_accept_dequeue();
1367 * the grafted socket keeps ch alive from here.
1368 */
1369 sock_put(ch);
1370 break;
1371 }
1372
1373 if (!timeo) {
1374 err = -EAGAIN;
1375 break;
1376 }
1377
1378 if (signal_pending(current)) {
1379 err = sock_intr_errno(timeo);
1380 break;
1381 }
1382
1383 release_sock(sk);
1384
1385 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1386 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1387 }
1388 remove_wait_queue(sk_sleep(sk), &wait);
1389
1390 if (err)
1391 goto done;
1392
1393 newsock->state = SS_CONNECTED;
1394
1395 BT_DBG("new socket %p", ch);
1396
1397 /* A Broadcast Sink might require BIG sync to be terminated
1398 * and re-established multiple times, while keeping the same
1399 * PA sync handle active. To allow this, once all BIS
1400 * connections have been accepted on a PA sync parent socket,
1401 * "reset" socket state, to allow future BIG re-sync procedures.
1402 */
1403 if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) {
1404 /* Iterate through the list of bound BIS indices
1405 * and clear each BIS as they are accepted by the
1406 * user space, one by one.
1407 */
1408 for (int i = 0; i < iso_pi(sk)->bc_num_bis; i++) {
1409 if (iso_pi(sk)->bc_bis[i] > 0) {
1410 iso_pi(sk)->bc_bis[i] = 0;
1411 iso_pi(sk)->bc_num_bis--;
1412 break;
1413 }
1414 }
1415
1416 if (iso_pi(sk)->bc_num_bis == 0) {
1417 /* Once the last BIS was accepted, reset parent
1418 * socket parameters to mark that the listening
1419 * process for BIS connections has been completed:
1420 *
1421 * 1. Reset the DEFER setup flag on the parent sk.
1422 * 2. Clear the flag marking that the BIG create
1423 * sync command is pending.
1424 * 3. Transition socket state from BT_LISTEN to
1425 * BT_CONNECTED.
1426 */
1427 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1428 clear_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags);
1429 sk->sk_state = BT_CONNECTED;
1430 }
1431 }
1432
1433 done:
1434 release_sock(sk);
1435 return err;
1436 }
1437
iso_sock_getname(struct socket * sock,struct sockaddr * addr,int peer)1438 static int iso_sock_getname(struct socket *sock, struct sockaddr *addr,
1439 int peer)
1440 {
1441 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1442 struct sock *sk = sock->sk;
1443 int len = sizeof(struct sockaddr_iso);
1444
1445 BT_DBG("sock %p, sk %p", sock, sk);
1446
1447 addr->sa_family = AF_BLUETOOTH;
1448
1449 if (peer) {
1450 struct hci_conn *hcon = iso_pi(sk)->conn ?
1451 iso_pi(sk)->conn->hcon : NULL;
1452
1453 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->dst);
1454 sa->iso_bdaddr_type = iso_pi(sk)->dst_type;
1455
1456 if (hcon && (hcon->type == BIS_LINK || hcon->type == PA_LINK)) {
1457 sa->iso_bc->bc_sid = iso_pi(sk)->bc_sid;
1458 sa->iso_bc->bc_num_bis = iso_pi(sk)->bc_num_bis;
1459 memcpy(sa->iso_bc->bc_bis, iso_pi(sk)->bc_bis,
1460 ISO_MAX_NUM_BIS);
1461 len += sizeof(struct sockaddr_iso_bc);
1462 }
1463 } else {
1464 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->src);
1465 sa->iso_bdaddr_type = iso_pi(sk)->src_type;
1466 }
1467
1468 return len;
1469 }
1470
iso_sock_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1471 static int iso_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1472 size_t len)
1473 {
1474 struct sock *sk = sock->sk;
1475 struct sk_buff *skb, **frag;
1476 struct sockcm_cookie sockc;
1477 size_t mtu;
1478 int err;
1479
1480 BT_DBG("sock %p, sk %p", sock, sk);
1481
1482 err = sock_error(sk);
1483 if (err)
1484 return err;
1485
1486 if (msg->msg_flags & MSG_OOB)
1487 return -EOPNOTSUPP;
1488
1489 hci_sockcm_init(&sockc, sk);
1490
1491 if (msg->msg_controllen) {
1492 err = sock_cmsg_send(sk, msg, &sockc);
1493 if (err)
1494 return err;
1495 }
1496
1497 lock_sock(sk);
1498
1499 if (sk->sk_state != BT_CONNECTED) {
1500 release_sock(sk);
1501 return -ENOTCONN;
1502 }
1503
1504 mtu = iso_pi(sk)->conn->hcon->mtu;
1505
1506 release_sock(sk);
1507
1508 skb = bt_skb_sendmsg(sk, msg, len, mtu, HCI_ISO_DATA_HDR_SIZE, 0);
1509 if (IS_ERR(skb))
1510 return PTR_ERR(skb);
1511
1512 len -= skb->len;
1513
1514 BT_DBG("skb %p len %d", sk, skb->len);
1515
1516 /* Continuation fragments */
1517 frag = &skb_shinfo(skb)->frag_list;
1518 while (len) {
1519 struct sk_buff *tmp;
1520
1521 tmp = bt_skb_sendmsg(sk, msg, len, mtu, 0, 0);
1522 if (IS_ERR(tmp)) {
1523 kfree_skb(skb);
1524 return PTR_ERR(tmp);
1525 }
1526
1527 *frag = tmp;
1528
1529 len -= tmp->len;
1530
1531 skb->len += tmp->len;
1532 skb->data_len += tmp->len;
1533
1534 BT_DBG("frag %p len %d", *frag, tmp->len);
1535
1536 frag = &(*frag)->next;
1537 }
1538
1539 lock_sock(sk);
1540
1541 if (sk->sk_state == BT_CONNECTED)
1542 err = iso_send_frame(sk, skb, &sockc);
1543 else
1544 err = -ENOTCONN;
1545
1546 release_sock(sk);
1547
1548 if (err < 0)
1549 kfree_skb(skb);
1550 return err;
1551 }
1552
iso_conn_defer_accept(struct hci_conn * conn)1553 static void iso_conn_defer_accept(struct hci_conn *conn)
1554 {
1555 struct hci_cp_le_accept_cis cp;
1556 struct hci_dev *hdev = conn->hdev;
1557
1558 BT_DBG("conn %p", conn);
1559
1560 conn->state = BT_CONFIG;
1561
1562 cp.handle = cpu_to_le16(conn->handle);
1563
1564 hci_send_cmd(hdev, HCI_OP_LE_ACCEPT_CIS, sizeof(cp), &cp);
1565 }
1566
iso_conn_big_sync(struct sock * sk)1567 static void iso_conn_big_sync(struct sock *sk)
1568 {
1569 int err;
1570 struct hci_dev *hdev;
1571
1572 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
1573 iso_pi(sk)->src_type);
1574
1575 if (!hdev)
1576 return;
1577
1578 /* hci_le_big_create_sync requires hdev lock to be held, since
1579 * it enqueues the HCI LE BIG Create Sync command via
1580 * hci_cmd_sync_queue_once, which checks hdev flags that might
1581 * change.
1582 */
1583 hci_dev_lock(hdev);
1584 lock_sock(sk);
1585
1586 if (!test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags)) {
1587 err = hci_conn_big_create_sync(hdev, iso_pi(sk)->conn->hcon,
1588 &iso_pi(sk)->qos,
1589 iso_pi(sk)->sync_handle,
1590 iso_pi(sk)->bc_num_bis,
1591 iso_pi(sk)->bc_bis);
1592 if (err)
1593 bt_dev_err(hdev, "hci_big_create_sync: %d", err);
1594 }
1595
1596 release_sock(sk);
1597 hci_dev_unlock(hdev);
1598 }
1599
iso_sock_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)1600 static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1601 size_t len, int flags)
1602 {
1603 struct sock *sk = sock->sk;
1604 struct iso_pinfo *pi = iso_pi(sk);
1605 bool early_ret = false;
1606 int err = 0;
1607
1608 BT_DBG("sk %p", sk);
1609
1610 if (unlikely(flags & MSG_ERRQUEUE))
1611 return sock_recv_errqueue(sk, msg, len, SOL_BLUETOOTH,
1612 BT_SCM_ERROR);
1613
1614 if (test_and_clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1615 sock_hold(sk);
1616 lock_sock(sk);
1617
1618 switch (sk->sk_state) {
1619 case BT_CONNECT2:
1620 if (test_bit(BT_SK_PA_SYNC, &pi->flags)) {
1621 release_sock(sk);
1622 iso_conn_big_sync(sk);
1623 lock_sock(sk);
1624
1625 sk->sk_state = BT_LISTEN;
1626 } else {
1627 iso_conn_defer_accept(pi->conn->hcon);
1628 sk->sk_state = BT_CONFIG;
1629 }
1630
1631 early_ret = true;
1632 break;
1633 case BT_CONNECTED:
1634 if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) {
1635 release_sock(sk);
1636 iso_conn_big_sync(sk);
1637 lock_sock(sk);
1638
1639 sk->sk_state = BT_LISTEN;
1640 early_ret = true;
1641 }
1642
1643 break;
1644 case BT_CONNECT:
1645 release_sock(sk);
1646 err = iso_connect_cis(sk);
1647 lock_sock(sk);
1648
1649 early_ret = true;
1650 break;
1651 default:
1652 break;
1653 }
1654
1655 release_sock(sk);
1656 sock_put(sk);
1657
1658 if (early_ret)
1659 return err;
1660 }
1661
1662 return bt_sock_recvmsg(sock, msg, len, flags);
1663 }
1664
check_io_qos(struct bt_iso_io_qos * qos)1665 static bool check_io_qos(struct bt_iso_io_qos *qos)
1666 {
1667 /* If no PHY is enable SDU must be 0 */
1668 if (!qos->phys && qos->sdu)
1669 return false;
1670
1671 if (qos->interval && (qos->interval < 0xff || qos->interval > 0xfffff))
1672 return false;
1673
1674 if (qos->latency && (qos->latency < 0x05 || qos->latency > 0xfa0))
1675 return false;
1676
1677 if (qos->phys > BT_ISO_PHY_ANY)
1678 return false;
1679
1680 return true;
1681 }
1682
check_ucast_qos(struct bt_iso_qos * qos)1683 static bool check_ucast_qos(struct bt_iso_qos *qos)
1684 {
1685 if (qos->ucast.cig > 0xef && qos->ucast.cig != BT_ISO_QOS_CIG_UNSET)
1686 return false;
1687
1688 if (qos->ucast.cis > 0xef && qos->ucast.cis != BT_ISO_QOS_CIS_UNSET)
1689 return false;
1690
1691 if (qos->ucast.sca > 0x07)
1692 return false;
1693
1694 if (qos->ucast.packing > 0x01)
1695 return false;
1696
1697 if (qos->ucast.framing > 0x01)
1698 return false;
1699
1700 if (!check_io_qos(&qos->ucast.in))
1701 return false;
1702
1703 if (!check_io_qos(&qos->ucast.out))
1704 return false;
1705
1706 return true;
1707 }
1708
check_bcast_qos(struct bt_iso_qos * qos)1709 static bool check_bcast_qos(struct bt_iso_qos *qos)
1710 {
1711 if (!qos->bcast.sync_factor)
1712 qos->bcast.sync_factor = 0x01;
1713
1714 if (qos->bcast.packing > 0x01)
1715 return false;
1716
1717 if (qos->bcast.framing > 0x01)
1718 return false;
1719
1720 if (!check_io_qos(&qos->bcast.in))
1721 return false;
1722
1723 if (!check_io_qos(&qos->bcast.out))
1724 return false;
1725
1726 if (qos->bcast.encryption > 0x01)
1727 return false;
1728
1729 if (qos->bcast.options > 0x07)
1730 return false;
1731
1732 if (qos->bcast.skip > 0x01f3)
1733 return false;
1734
1735 if (!qos->bcast.sync_timeout)
1736 qos->bcast.sync_timeout = BT_ISO_SYNC_TIMEOUT;
1737
1738 if (qos->bcast.sync_timeout < 0x000a || qos->bcast.sync_timeout > 0x4000)
1739 return false;
1740
1741 if (qos->bcast.sync_cte_type > 0x1f)
1742 return false;
1743
1744 if (qos->bcast.mse > 0x1f)
1745 return false;
1746
1747 if (!qos->bcast.timeout)
1748 qos->bcast.sync_timeout = BT_ISO_SYNC_TIMEOUT;
1749
1750 if (qos->bcast.timeout < 0x000a || qos->bcast.timeout > 0x4000)
1751 return false;
1752
1753 return true;
1754 }
1755
iso_sock_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)1756 static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
1757 sockptr_t optval, unsigned int optlen)
1758 {
1759 struct sock *sk = sock->sk;
1760 int err = 0;
1761 struct bt_iso_qos qos = default_qos;
1762 u32 opt;
1763
1764 BT_DBG("sk %p", sk);
1765
1766 lock_sock(sk);
1767
1768 switch (optname) {
1769 case BT_DEFER_SETUP:
1770 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1771 err = -EINVAL;
1772 break;
1773 }
1774
1775 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
1776 if (err)
1777 break;
1778
1779 if (opt)
1780 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1781 else
1782 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1783 break;
1784
1785 case BT_PKT_STATUS:
1786 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
1787 if (err)
1788 break;
1789
1790 if (opt)
1791 set_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
1792 else
1793 clear_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
1794 break;
1795
1796 case BT_PKT_SEQNUM:
1797 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
1798 if (err)
1799 break;
1800
1801 if (opt)
1802 set_bit(BT_SK_PKT_SEQNUM, &bt_sk(sk)->flags);
1803 else
1804 clear_bit(BT_SK_PKT_SEQNUM, &bt_sk(sk)->flags);
1805 break;
1806
1807 case BT_ISO_QOS:
1808 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1809 sk->sk_state != BT_CONNECT2 &&
1810 (!test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags) ||
1811 sk->sk_state != BT_CONNECTED)) {
1812 err = -EINVAL;
1813 break;
1814 }
1815
1816 err = copy_safe_from_sockptr(&qos, sizeof(qos), optval, optlen);
1817 if (err)
1818 break;
1819
1820 iso_pi(sk)->qos = qos;
1821 iso_pi(sk)->qos_user_set = true;
1822
1823 break;
1824
1825 case BT_ISO_BASE:
1826 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1827 sk->sk_state != BT_CONNECT2) {
1828 err = -EINVAL;
1829 break;
1830 }
1831
1832 if (optlen > sizeof(iso_pi(sk)->base)) {
1833 err = -EINVAL;
1834 break;
1835 }
1836
1837 err = copy_safe_from_sockptr(iso_pi(sk)->base, optlen, optval,
1838 optlen);
1839 if (err)
1840 break;
1841
1842 iso_pi(sk)->base_len = optlen;
1843
1844 break;
1845
1846 default:
1847 err = -ENOPROTOOPT;
1848 break;
1849 }
1850
1851 release_sock(sk);
1852 return err;
1853 }
1854
iso_sock_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)1855 static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
1856 char __user *optval, int __user *optlen)
1857 {
1858 struct sock *sk = sock->sk;
1859 int len, err = 0;
1860 struct bt_iso_qos *qos;
1861 u8 base_len;
1862 u8 *base;
1863
1864 BT_DBG("sk %p", sk);
1865
1866 if (get_user(len, optlen))
1867 return -EFAULT;
1868
1869 lock_sock(sk);
1870
1871 switch (optname) {
1872 case BT_DEFER_SETUP:
1873 if (sk->sk_state == BT_CONNECTED) {
1874 err = -EINVAL;
1875 break;
1876 }
1877
1878 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
1879 (u32 __user *)optval))
1880 err = -EFAULT;
1881
1882 break;
1883
1884 case BT_PKT_STATUS:
1885 if (put_user(test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags),
1886 (int __user *)optval))
1887 err = -EFAULT;
1888 break;
1889
1890 case BT_ISO_QOS:
1891 qos = iso_sock_get_qos(sk);
1892
1893 len = min_t(unsigned int, len, sizeof(*qos));
1894 if (copy_to_user(optval, qos, len))
1895 err = -EFAULT;
1896
1897 break;
1898
1899 case BT_ISO_BASE:
1900 if (sk->sk_state == BT_CONNECTED &&
1901 !bacmp(&iso_pi(sk)->dst, BDADDR_ANY)) {
1902 base_len = iso_pi(sk)->conn->hcon->le_per_adv_data_len;
1903 base = iso_pi(sk)->conn->hcon->le_per_adv_data;
1904 } else {
1905 base_len = iso_pi(sk)->base_len;
1906 base = iso_pi(sk)->base;
1907 }
1908
1909 len = min_t(unsigned int, len, base_len);
1910 if (copy_to_user(optval, base, len))
1911 err = -EFAULT;
1912 if (put_user(len, optlen))
1913 err = -EFAULT;
1914
1915 break;
1916
1917 default:
1918 err = -ENOPROTOOPT;
1919 break;
1920 }
1921
1922 release_sock(sk);
1923 return err;
1924 }
1925
iso_sock_shutdown(struct socket * sock,int how)1926 static int iso_sock_shutdown(struct socket *sock, int how)
1927 {
1928 struct sock *sk = sock->sk;
1929 int err = 0;
1930
1931 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1932
1933 if (!sk)
1934 return 0;
1935
1936 sock_hold(sk);
1937 lock_sock(sk);
1938
1939 switch (how) {
1940 case SHUT_RD:
1941 if (sk->sk_shutdown & RCV_SHUTDOWN)
1942 goto unlock;
1943 sk->sk_shutdown |= RCV_SHUTDOWN;
1944 break;
1945 case SHUT_WR:
1946 if (sk->sk_shutdown & SEND_SHUTDOWN)
1947 goto unlock;
1948 sk->sk_shutdown |= SEND_SHUTDOWN;
1949 break;
1950 case SHUT_RDWR:
1951 if (sk->sk_shutdown & SHUTDOWN_MASK)
1952 goto unlock;
1953 sk->sk_shutdown |= SHUTDOWN_MASK;
1954 break;
1955 }
1956
1957 iso_sock_clear_timer(sk);
1958 __iso_sock_close(sk);
1959
1960 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1961 !(current->flags & PF_EXITING))
1962 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1963
1964 unlock:
1965 release_sock(sk);
1966 sock_put(sk);
1967
1968 return err;
1969 }
1970
iso_sock_release(struct socket * sock)1971 static int iso_sock_release(struct socket *sock)
1972 {
1973 struct sock *sk = sock->sk;
1974 int err = 0;
1975
1976 BT_DBG("sock %p, sk %p", sock, sk);
1977
1978 if (!sk)
1979 return 0;
1980
1981 iso_sock_close(sk);
1982
1983 if (sock_flag(sk, SOCK_LINGER) && READ_ONCE(sk->sk_lingertime) &&
1984 !(current->flags & PF_EXITING)) {
1985 lock_sock(sk);
1986 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1987 release_sock(sk);
1988 }
1989
1990 sock_orphan(sk);
1991 iso_sock_kill(sk);
1992 return err;
1993 }
1994
iso_sock_ready(struct sock * sk)1995 static void iso_sock_ready(struct sock *sk)
1996 {
1997 BT_DBG("sk %p", sk);
1998
1999 if (!sk)
2000 return;
2001
2002 lock_sock(sk);
2003 iso_sock_clear_timer(sk);
2004 sk->sk_state = BT_CONNECTED;
2005 sk->sk_state_change(sk);
2006 release_sock(sk);
2007 }
2008
iso_match_big(struct sock * sk,void * data)2009 static bool iso_match_big(struct sock *sk, void *data)
2010 {
2011 struct hci_evt_le_big_sync_established *ev = data;
2012
2013 return ev->handle == iso_pi(sk)->qos.bcast.big;
2014 }
2015
iso_match_big_hcon(struct sock * sk,void * data)2016 static bool iso_match_big_hcon(struct sock *sk, void *data)
2017 {
2018 struct hci_conn *hcon = data;
2019
2020 return hcon->iso_qos.bcast.big == iso_pi(sk)->qos.bcast.big;
2021 }
2022
iso_match_pa_sync_flag(struct sock * sk,void * data)2023 static bool iso_match_pa_sync_flag(struct sock *sk, void *data)
2024 {
2025 return test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags);
2026 }
2027
iso_match_dst(struct sock * sk,void * data)2028 static bool iso_match_dst(struct sock *sk, void *data)
2029 {
2030 return !bacmp(&iso_pi(sk)->dst, (bdaddr_t *)data);
2031 }
2032
iso_conn_ready(struct iso_conn * conn)2033 static void iso_conn_ready(struct iso_conn *conn)
2034 {
2035 struct sock *parent = NULL;
2036 struct sock *sk = conn->sk;
2037 struct hci_ev_le_big_sync_established *ev = NULL;
2038 struct hci_ev_le_pa_sync_established *ev2 = NULL;
2039 struct hci_ev_le_per_adv_report *ev3 = NULL;
2040 struct hci_conn *hcon;
2041 struct hci_dev *hdev;
2042
2043 BT_DBG("conn %p", conn);
2044
2045 if (sk) {
2046 /* Attempt to update source address in case of BIS Sender if
2047 * the advertisement is using a random address.
2048 */
2049 if (conn->hcon->type == BIS_LINK &&
2050 conn->hcon->role == HCI_ROLE_MASTER &&
2051 !bacmp(&conn->hcon->dst, BDADDR_ANY)) {
2052 struct hci_conn *bis = conn->hcon;
2053 struct adv_info *adv;
2054
2055 adv = hci_find_adv_instance(bis->hdev,
2056 bis->iso_qos.bcast.bis);
2057 if (adv && bacmp(&adv->random_addr, BDADDR_ANY)) {
2058 lock_sock(sk);
2059 iso_pi(sk)->src_type = BDADDR_LE_RANDOM;
2060 bacpy(&iso_pi(sk)->src, &adv->random_addr);
2061 release_sock(sk);
2062 }
2063 }
2064
2065 iso_sock_ready(conn->sk);
2066 } else {
2067 hcon = conn->hcon;
2068 if (!hcon)
2069 return;
2070
2071 hdev = hcon->hdev;
2072
2073 if (test_bit(HCI_CONN_BIG_SYNC, &hcon->flags)) {
2074 /* A BIS slave hcon is notified to the ISO layer
2075 * after the Command Complete for the LE Setup
2076 * ISO Data Path command is received. Get the
2077 * parent socket that matches the hcon BIG handle.
2078 */
2079 parent = iso_get_sock(hdev, &hcon->src, &hcon->dst,
2080 BT_LISTEN, iso_match_big_hcon,
2081 hcon);
2082 } else if (test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags)) {
2083 ev = hci_recv_event_data(hcon->hdev,
2084 HCI_EVT_LE_BIG_SYNC_ESTABLISHED);
2085
2086 /* Get reference to PA sync parent socket, if it exists */
2087 parent = iso_get_sock(hdev, &hcon->src, &hcon->dst,
2088 BT_LISTEN,
2089 iso_match_pa_sync_flag,
2090 NULL);
2091 if (!parent && ev)
2092 parent = iso_get_sock(hdev, &hcon->src,
2093 &hcon->dst,
2094 BT_LISTEN,
2095 iso_match_big, ev);
2096 } else if (test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
2097 ev2 = hci_recv_event_data(hcon->hdev,
2098 HCI_EV_LE_PA_SYNC_ESTABLISHED);
2099 if (ev2)
2100 parent = iso_get_sock(hdev, &hcon->src,
2101 &hcon->dst,
2102 BT_LISTEN,
2103 iso_match_sid, ev2);
2104 } else if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) {
2105 ev3 = hci_recv_event_data(hcon->hdev,
2106 HCI_EV_LE_PER_ADV_REPORT);
2107 if (ev3)
2108 parent = iso_get_sock(hdev, &hcon->src,
2109 &hcon->dst,
2110 BT_LISTEN,
2111 iso_match_sync_handle_pa_report,
2112 ev3);
2113 }
2114
2115 if (!parent)
2116 parent = iso_get_sock(hdev, &hcon->src, BDADDR_ANY,
2117 BT_LISTEN, iso_match_dst, BDADDR_ANY);
2118
2119 if (!parent)
2120 return;
2121
2122 lock_sock(parent);
2123
2124 sk = iso_sock_alloc(sock_net(parent), NULL,
2125 BTPROTO_ISO, GFP_ATOMIC, 0);
2126 if (!sk) {
2127 release_sock(parent);
2128 return;
2129 }
2130
2131 iso_sock_init(sk, parent);
2132
2133 bacpy(&iso_pi(sk)->src, &hcon->src);
2134
2135 /* Convert from HCI to three-value type */
2136 if (hcon->src_type == ADDR_LE_DEV_PUBLIC)
2137 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
2138 else
2139 iso_pi(sk)->src_type = BDADDR_LE_RANDOM;
2140
2141 /* If hcon has no destination address (BDADDR_ANY) it means it
2142 * was created by HCI_EV_LE_BIG_SYNC_ESTABILISHED or
2143 * HCI_EV_LE_PA_SYNC_ESTABLISHED so we need to initialize using
2144 * the parent socket destination address.
2145 */
2146 if (!bacmp(&hcon->dst, BDADDR_ANY)) {
2147 bacpy(&hcon->dst, &iso_pi(parent)->dst);
2148 hcon->dst_type = le_addr_type(iso_pi(parent)->dst_type);
2149 }
2150
2151 if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) {
2152 iso_pi(sk)->qos = iso_pi(parent)->qos;
2153 hcon->iso_qos = iso_pi(sk)->qos;
2154 iso_pi(sk)->bc_sid = iso_pi(parent)->bc_sid;
2155 iso_pi(sk)->bc_num_bis = iso_pi(parent)->bc_num_bis;
2156 memcpy(iso_pi(sk)->bc_bis, iso_pi(parent)->bc_bis,
2157 ISO_MAX_NUM_BIS);
2158 set_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags);
2159 }
2160
2161 bacpy(&iso_pi(sk)->dst, &hcon->dst);
2162
2163 /* Convert from HCI to three-value type */
2164 if (hcon->dst_type == ADDR_LE_DEV_PUBLIC)
2165 iso_pi(sk)->dst_type = BDADDR_LE_PUBLIC;
2166 else
2167 iso_pi(sk)->dst_type = BDADDR_LE_RANDOM;
2168
2169 iso_pi(sk)->sync_handle = iso_pi(parent)->sync_handle;
2170 memcpy(iso_pi(sk)->base, iso_pi(parent)->base, iso_pi(parent)->base_len);
2171 iso_pi(sk)->base_len = iso_pi(parent)->base_len;
2172
2173 hci_conn_hold(hcon);
2174 iso_chan_add(conn, sk, parent);
2175
2176 if ((ev && ((struct hci_evt_le_big_sync_established *)ev)->status) ||
2177 (ev2 && ev2->status)) {
2178 /* Trigger error signal on child socket */
2179 sk->sk_err = ECONNREFUSED;
2180 sk->sk_error_report(sk);
2181 }
2182
2183 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
2184 sk->sk_state = BT_CONNECT2;
2185 else
2186 sk->sk_state = BT_CONNECTED;
2187
2188 /* Wake up parent */
2189 parent->sk_data_ready(parent);
2190
2191 release_sock(parent);
2192 sock_put(parent);
2193 }
2194 }
2195
iso_match_sid(struct sock * sk,void * data)2196 static bool iso_match_sid(struct sock *sk, void *data)
2197 {
2198 struct hci_ev_le_pa_sync_established *ev = data;
2199
2200 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID)
2201 return true;
2202
2203 return ev->sid == iso_pi(sk)->bc_sid;
2204 }
2205
iso_match_sid_past(struct sock * sk,void * data)2206 static bool iso_match_sid_past(struct sock *sk, void *data)
2207 {
2208 struct hci_ev_le_past_received *ev = data;
2209
2210 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID)
2211 return true;
2212
2213 return ev->sid == iso_pi(sk)->bc_sid;
2214 }
2215
iso_match_sync_handle(struct sock * sk,void * data)2216 static bool iso_match_sync_handle(struct sock *sk, void *data)
2217 {
2218 struct hci_evt_le_big_info_adv_report *ev = data;
2219
2220 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
2221 }
2222
iso_match_sync_handle_pa_report(struct sock * sk,void * data)2223 static bool iso_match_sync_handle_pa_report(struct sock *sk, void *data)
2224 {
2225 struct hci_ev_le_per_adv_report *ev = data;
2226
2227 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
2228 }
2229
2230 /* ----- ISO interface with lower layer (HCI) ----- */
2231
iso_connect_ind(struct hci_dev * hdev,bdaddr_t * bdaddr,__u8 * flags)2232 int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
2233 {
2234 struct hci_ev_le_pa_sync_established *ev1;
2235 struct hci_ev_le_past_received *ev1a;
2236 struct hci_evt_le_big_info_adv_report *ev2;
2237 struct hci_ev_le_per_adv_report *ev3;
2238 struct sock *sk;
2239
2240 bt_dev_dbg(hdev, "bdaddr %pMR", bdaddr);
2241
2242 /* Broadcast receiver requires handling of some events before it can
2243 * proceed to establishing a BIG sync:
2244 *
2245 * 1. HCI_EV_LE_PA_SYNC_ESTABLISHED: The socket may specify a specific
2246 * SID to listen to and once sync is established its handle needs to
2247 * be stored in iso_pi(sk)->sync_handle so it can be matched once
2248 * receiving the BIG Info.
2249 * 1a. HCI_EV_LE_PAST_RECEIVED: alternative to 1.
2250 * 2. HCI_EVT_LE_BIG_INFO_ADV_REPORT: When connect_ind is triggered by a
2251 * a BIG Info it attempts to check if there any listening socket with
2252 * the same sync_handle and if it does then attempt to create a sync.
2253 * 3. HCI_EV_LE_PER_ADV_REPORT: When a PA report is received, it is stored
2254 * in iso_pi(sk)->base so it can be passed up to user, in the case of a
2255 * broadcast sink.
2256 */
2257 ev1 = hci_recv_event_data(hdev, HCI_EV_LE_PA_SYNC_ESTABLISHED);
2258 if (ev1) {
2259 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN,
2260 iso_match_sid, ev1);
2261 if (sk && !ev1->status) {
2262 lock_sock(sk);
2263 iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);
2264 iso_pi(sk)->bc_sid = ev1->sid;
2265 release_sock(sk);
2266 }
2267
2268 goto done;
2269 }
2270
2271 ev1a = hci_recv_event_data(hdev, HCI_EV_LE_PAST_RECEIVED);
2272 if (ev1a) {
2273 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN,
2274 iso_match_sid_past, ev1a);
2275 if (sk && !ev1a->status) {
2276 lock_sock(sk);
2277 iso_pi(sk)->sync_handle = le16_to_cpu(ev1a->sync_handle);
2278 iso_pi(sk)->bc_sid = ev1a->sid;
2279 release_sock(sk);
2280 }
2281
2282 goto done;
2283 }
2284
2285 ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT);
2286 if (ev2) {
2287 /* Check if BIGInfo report has already been handled */
2288 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_CONNECTED,
2289 iso_match_sync_handle, ev2);
2290 if (sk) {
2291 sock_put(sk);
2292 sk = NULL;
2293 goto done;
2294 }
2295
2296 /* Try to get PA sync socket, if it exists */
2297 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_CONNECT2,
2298 iso_match_sync_handle, ev2);
2299 if (!sk)
2300 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr,
2301 BT_LISTEN,
2302 iso_match_sync_handle,
2303 ev2);
2304
2305 if (sk) {
2306 int err = 0;
2307 bool big_sync;
2308 struct hci_conn *hcon;
2309
2310 lock_sock(sk);
2311
2312 hcon = iso_pi(sk)->conn->hcon;
2313 iso_pi(sk)->qos.bcast.encryption = ev2->encryption;
2314
2315 if (ev2->num_bis < iso_pi(sk)->bc_num_bis)
2316 iso_pi(sk)->bc_num_bis = ev2->num_bis;
2317
2318 big_sync = !test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags) &&
2319 !test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags);
2320
2321 if (big_sync)
2322 err = hci_conn_big_create_sync(hdev, hcon,
2323 &iso_pi(sk)->qos,
2324 iso_pi(sk)->sync_handle,
2325 iso_pi(sk)->bc_num_bis,
2326 iso_pi(sk)->bc_bis);
2327
2328 release_sock(sk);
2329
2330 if (big_sync && err) {
2331 bt_dev_err(hdev, "hci_le_big_create_sync: %d",
2332 err);
2333 sock_put(sk);
2334 sk = NULL;
2335 }
2336 }
2337
2338 goto done;
2339 }
2340
2341 ev3 = hci_recv_event_data(hdev, HCI_EV_LE_PER_ADV_REPORT);
2342 if (ev3) {
2343 size_t base_len = 0;
2344 u8 *base;
2345 struct hci_conn *hcon;
2346
2347 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN,
2348 iso_match_sync_handle_pa_report, ev3);
2349 if (!sk)
2350 goto done;
2351
2352 hcon = iso_pi(sk)->conn->hcon;
2353 if (!hcon)
2354 goto done;
2355
2356 if (ev3->data_status == LE_PA_DATA_TRUNCATED) {
2357 /* The controller was unable to retrieve PA data. */
2358 memset(hcon->le_per_adv_data, 0,
2359 HCI_MAX_PER_AD_TOT_LEN);
2360 hcon->le_per_adv_data_len = 0;
2361 hcon->le_per_adv_data_offset = 0;
2362 goto done;
2363 }
2364
2365 if (hcon->le_per_adv_data_offset + ev3->length >
2366 HCI_MAX_PER_AD_TOT_LEN)
2367 goto done;
2368
2369 memcpy(hcon->le_per_adv_data + hcon->le_per_adv_data_offset,
2370 ev3->data, ev3->length);
2371 hcon->le_per_adv_data_offset += ev3->length;
2372
2373 if (ev3->data_status == LE_PA_DATA_COMPLETE) {
2374 /* All PA data has been received. */
2375 hcon->le_per_adv_data_len =
2376 hcon->le_per_adv_data_offset;
2377 hcon->le_per_adv_data_offset = 0;
2378
2379 /* Extract BASE */
2380 base = eir_get_service_data(hcon->le_per_adv_data,
2381 hcon->le_per_adv_data_len,
2382 EIR_BAA_SERVICE_UUID,
2383 &base_len);
2384
2385 if (!base || base_len > BASE_MAX_LENGTH)
2386 goto done;
2387
2388 lock_sock(sk);
2389 memcpy(iso_pi(sk)->base, base, base_len);
2390 iso_pi(sk)->base_len = base_len;
2391 release_sock(sk);
2392 } else {
2393 /* This is a PA data fragment. Keep pa_data_len set to 0
2394 * until all data has been reassembled.
2395 */
2396 hcon->le_per_adv_data_len = 0;
2397 }
2398 } else {
2399 sk = iso_get_sock(hdev, &hdev->bdaddr, BDADDR_ANY,
2400 BT_LISTEN, iso_match_dst, BDADDR_ANY);
2401 }
2402
2403 done:
2404 if (!sk)
2405 return 0;
2406
2407 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
2408 *flags |= HCI_PROTO_DEFER;
2409
2410 sock_put(sk);
2411
2412 return HCI_LM_ACCEPT;
2413 }
2414
iso_connect_cfm(struct hci_conn * hcon,__u8 status)2415 static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
2416 {
2417 if (hcon->type != CIS_LINK && hcon->type != BIS_LINK &&
2418 hcon->type != PA_LINK) {
2419 if (hcon->type != LE_LINK)
2420 return;
2421
2422 /* Check if LE link has failed */
2423 if (status) {
2424 struct hci_link *link, *t;
2425
2426 list_for_each_entry_safe(link, t, &hcon->link_list,
2427 list)
2428 iso_conn_del(link->conn, bt_to_errno(status));
2429
2430 return;
2431 }
2432
2433 /* Create CIS if pending */
2434 hci_le_create_cis_pending(hcon->hdev);
2435 return;
2436 }
2437
2438 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
2439
2440 /* Similar to the success case, if HCI_CONN_BIG_SYNC_FAILED or
2441 * HCI_CONN_PA_SYNC_FAILED is set, queue the failed connection
2442 * into the accept queue of the listening socket and wake up
2443 * userspace, to inform the user about the event.
2444 */
2445 if (!status || test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags) ||
2446 test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
2447 struct iso_conn *conn;
2448
2449 conn = iso_conn_add(hcon);
2450 if (conn)
2451 iso_conn_ready(conn);
2452 } else {
2453 iso_conn_del(hcon, bt_to_errno(status));
2454 }
2455 }
2456
iso_disconn_cfm(struct hci_conn * hcon,__u8 reason)2457 static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
2458 {
2459 if (hcon->type != CIS_LINK && hcon->type != BIS_LINK &&
2460 hcon->type != PA_LINK)
2461 return;
2462
2463 BT_DBG("hcon %p reason %d", hcon, reason);
2464
2465 iso_conn_del(hcon, bt_to_errno(reason));
2466 }
2467
iso_recv(struct hci_dev * hdev,u16 handle,struct sk_buff * skb,u16 flags)2468 int iso_recv(struct hci_dev *hdev, u16 handle, struct sk_buff *skb, u16 flags)
2469 {
2470 struct hci_conn *hcon;
2471 struct iso_conn *conn;
2472 struct skb_shared_hwtstamps *hwts;
2473 __u16 pb, ts, len, sn;
2474
2475 hci_dev_lock(hdev);
2476
2477 hcon = hci_conn_hash_lookup_handle(hdev, handle);
2478 if (!hcon) {
2479 hci_dev_unlock(hdev);
2480 kfree_skb(skb);
2481 return -ENOENT;
2482 }
2483
2484 conn = iso_conn_hold_unless_zero(hcon->iso_data);
2485 hcon = NULL;
2486
2487 hci_dev_unlock(hdev);
2488
2489 if (!conn) {
2490 kfree_skb(skb);
2491 return -EINVAL;
2492 }
2493
2494 pb = hci_iso_flags_pb(flags);
2495 ts = hci_iso_flags_ts(flags);
2496
2497 BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);
2498
2499 switch (pb) {
2500 case ISO_START:
2501 case ISO_SINGLE:
2502 if (conn->rx_len) {
2503 BT_ERR("Unexpected start frame (len %d)", skb->len);
2504 kfree_skb(conn->rx_skb);
2505 conn->rx_skb = NULL;
2506 conn->rx_len = 0;
2507 }
2508
2509 if (ts) {
2510 struct hci_iso_ts_data_hdr *hdr;
2511
2512 hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
2513 if (!hdr) {
2514 BT_ERR("Frame is too short (len %d)", skb->len);
2515 goto drop;
2516 }
2517
2518 /* Record the timestamp to skb */
2519 hwts = skb_hwtstamps(skb);
2520 hwts->hwtstamp = us_to_ktime(le32_to_cpu(hdr->ts));
2521
2522 sn = __le16_to_cpu(hdr->sn);
2523 len = __le16_to_cpu(hdr->slen);
2524 } else {
2525 struct hci_iso_data_hdr *hdr;
2526
2527 hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
2528 if (!hdr) {
2529 BT_ERR("Frame is too short (len %d)", skb->len);
2530 goto drop;
2531 }
2532
2533 sn = __le16_to_cpu(hdr->sn);
2534 len = __le16_to_cpu(hdr->slen);
2535 }
2536
2537 flags = hci_iso_data_flags(len);
2538 len = hci_iso_data_len(len);
2539
2540 BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x sn %d",
2541 len, skb->len, flags, sn);
2542
2543 if (len == skb->len) {
2544 /* Complete frame received */
2545 hci_skb_pkt_status(skb) = flags & 0x03;
2546 hci_skb_pkt_seqnum(skb) = sn;
2547 iso_recv_frame(conn, skb);
2548 goto done;
2549 }
2550
2551 if (pb == ISO_SINGLE) {
2552 BT_ERR("Frame malformed (len %d, expected len %d)",
2553 skb->len, len);
2554 goto drop;
2555 }
2556
2557 if (skb->len > len) {
2558 BT_ERR("Frame is too long (len %d, expected len %d)",
2559 skb->len, len);
2560 goto drop;
2561 }
2562
2563 /* Allocate skb for the complete frame (with header) */
2564 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
2565 if (!conn->rx_skb)
2566 goto drop;
2567
2568 hci_skb_pkt_status(conn->rx_skb) = flags & 0x03;
2569 hci_skb_pkt_seqnum(conn->rx_skb) = sn;
2570 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2571 skb->len);
2572 conn->rx_len = len - skb->len;
2573
2574 /* Copy hw timestamp from skb to rx_skb if present */
2575 if (ts) {
2576 hwts = skb_hwtstamps(conn->rx_skb);
2577 hwts->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
2578 }
2579
2580 break;
2581
2582 case ISO_CONT:
2583 BT_DBG("Cont: frag len %d (expecting %d)", skb->len,
2584 conn->rx_len);
2585
2586 if (!conn->rx_len) {
2587 BT_ERR("Unexpected continuation frame (len %d)",
2588 skb->len);
2589 goto drop;
2590 }
2591
2592 if (skb->len > conn->rx_len) {
2593 BT_ERR("Fragment is too long (len %d, expected %d)",
2594 skb->len, conn->rx_len);
2595 kfree_skb(conn->rx_skb);
2596 conn->rx_skb = NULL;
2597 conn->rx_len = 0;
2598 goto drop;
2599 }
2600
2601 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2602 skb->len);
2603 conn->rx_len -= skb->len;
2604 break;
2605
2606 case ISO_END:
2607 if (!conn->rx_len) {
2608 BT_ERR("Unexpected end frame (len %d)", skb->len);
2609 goto drop;
2610 }
2611
2612 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2613 skb->len);
2614 conn->rx_len -= skb->len;
2615
2616 if (!conn->rx_len) {
2617 struct sk_buff *rx_skb = conn->rx_skb;
2618
2619 /* Complete frame received. iso_recv_frame
2620 * takes ownership of the skb so set the global
2621 * rx_skb pointer to NULL first.
2622 */
2623 conn->rx_skb = NULL;
2624 iso_recv_frame(conn, rx_skb);
2625 }
2626 break;
2627 }
2628
2629 drop:
2630 kfree_skb(skb);
2631 done:
2632 iso_conn_put(conn);
2633 return 0;
2634 }
2635
2636 static struct hci_cb iso_cb = {
2637 .name = "ISO",
2638 .connect_cfm = iso_connect_cfm,
2639 .disconn_cfm = iso_disconn_cfm,
2640 };
2641
iso_debugfs_show(struct seq_file * f,void * p)2642 static int iso_debugfs_show(struct seq_file *f, void *p)
2643 {
2644 struct sock *sk;
2645
2646 read_lock(&iso_sk_list.lock);
2647
2648 sk_for_each(sk, &iso_sk_list.head) {
2649 seq_printf(f, "%pMR %pMR %d\n", &iso_pi(sk)->src,
2650 &iso_pi(sk)->dst, sk->sk_state);
2651 }
2652
2653 read_unlock(&iso_sk_list.lock);
2654
2655 return 0;
2656 }
2657
2658 DEFINE_SHOW_ATTRIBUTE(iso_debugfs);
2659
2660 static struct dentry *iso_debugfs;
2661
2662 static const struct proto_ops iso_sock_ops = {
2663 .family = PF_BLUETOOTH,
2664 .owner = THIS_MODULE,
2665 .release = iso_sock_release,
2666 .bind = iso_sock_bind,
2667 .connect = iso_sock_connect,
2668 .listen = iso_sock_listen,
2669 .accept = iso_sock_accept,
2670 .getname = iso_sock_getname,
2671 .sendmsg = iso_sock_sendmsg,
2672 .recvmsg = iso_sock_recvmsg,
2673 .poll = bt_sock_poll,
2674 .ioctl = bt_sock_ioctl,
2675 .mmap = sock_no_mmap,
2676 .socketpair = sock_no_socketpair,
2677 .shutdown = iso_sock_shutdown,
2678 .setsockopt = iso_sock_setsockopt,
2679 .getsockopt = iso_sock_getsockopt
2680 };
2681
2682 static const struct net_proto_family iso_sock_family_ops = {
2683 .family = PF_BLUETOOTH,
2684 .owner = THIS_MODULE,
2685 .create = iso_sock_create,
2686 };
2687
2688 static bool inited;
2689
iso_inited(void)2690 bool iso_inited(void)
2691 {
2692 return inited;
2693 }
2694
iso_init(void)2695 int iso_init(void)
2696 {
2697 int err;
2698
2699 BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr));
2700
2701 if (inited)
2702 return -EALREADY;
2703
2704 err = proto_register(&iso_proto, 0);
2705 if (err < 0)
2706 return err;
2707
2708 err = bt_sock_register(BTPROTO_ISO, &iso_sock_family_ops);
2709 if (err < 0) {
2710 BT_ERR("ISO socket registration failed");
2711 goto error;
2712 }
2713
2714 err = bt_procfs_init(&init_net, "iso", &iso_sk_list, NULL);
2715 if (err < 0) {
2716 BT_ERR("Failed to create ISO proc file");
2717 bt_sock_unregister(BTPROTO_ISO);
2718 goto error;
2719 }
2720
2721 BT_INFO("ISO socket layer initialized");
2722
2723 hci_register_cb(&iso_cb);
2724
2725 if (!IS_ERR_OR_NULL(bt_debugfs))
2726 iso_debugfs = debugfs_create_file("iso", 0444, bt_debugfs,
2727 NULL, &iso_debugfs_fops);
2728
2729 inited = true;
2730
2731 return 0;
2732
2733 error:
2734 proto_unregister(&iso_proto);
2735 return err;
2736 }
2737
iso_exit(void)2738 int iso_exit(void)
2739 {
2740 if (!inited)
2741 return -EALREADY;
2742
2743 bt_procfs_cleanup(&init_net, "iso");
2744
2745 debugfs_remove(iso_debugfs);
2746 iso_debugfs = NULL;
2747
2748 hci_unregister_cb(&iso_cb);
2749
2750 bt_sock_unregister(BTPROTO_ISO);
2751
2752 proto_unregister(&iso_proto);
2753
2754 inited = false;
2755
2756 return 0;
2757 }
2758