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