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
19static const struct proto_ops iso_sock_ops;
20
21static struct bt_sock_list iso_sk_list = {
22 .lock = __RW_LOCK_UNLOCKED(iso_sk_list.lock)
23};
24
25/* ---- ISO connections ---- */
26struct 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
44static void iso_sock_close(struct sock *sk);
45static 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 */
55enum {
56 BT_SK_BIG_SYNC,
57 BT_SK_PA_SYNC,
58};
59
60struct 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
78static struct bt_iso_qos default_qos;
79
80static bool check_ucast_qos(struct bt_iso_qos *qos);
81static bool check_bcast_qos(struct bt_iso_qos *qos);
82static bool iso_match_sid(struct sock *sk, void *data);
83static bool iso_match_sid_past(struct sock *sk, void *data);
84static bool iso_match_sync_handle(struct sock *sk, void *data);
85static bool iso_match_sync_handle_pa_report(struct sock *sk, void *data);
86static void iso_sock_disconn(struct sock *sk);
87
88typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);
89
90static 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
98static 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: conn->hcon);
110 }
111
112 /* Ensure no more work items will run since hci_conn has been dropped */
113 disable_delayed_work_sync(dwork: &conn->timeout_work);
114
115 kfree_skb(skb: conn->rx_skb);
116
117 kfree(objp: conn);
118}
119
120static 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(kref: &conn->ref, release: iso_conn_free);
128}
129
130static 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(kref: &conn->ref))
138 return NULL;
139
140 return conn;
141}
142
143static struct sock *iso_sock_hold(struct iso_conn *conn)
144{
145 if (!conn || !bt_sock_linked(l: &iso_sk_list, s: conn->sk))
146 return NULL;
147
148 sock_hold(sk: conn->sk);
149
150 return conn->sk;
151}
152
153static 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
180static 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(dwork: &iso_pi(sk)->conn->timeout_work);
187 schedule_delayed_work(dwork: &iso_pi(sk)->conn->timeout_work, delay: timeout);
188}
189
190static 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(dwork: &iso_pi(sk)->conn->timeout_work);
197}
198
199/* ---- ISO connections ---- */
200static 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(sizeof(*conn), GFP_KERNEL);
216 if (!conn)
217 return NULL;
218
219 kref_init(kref: &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. */
233static 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, flag: SOCK_ZAPPED);
262}
263
264static 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
293static 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, bh: true);
311
312 return 0;
313}
314
315static 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
327static 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
335static 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(dst: &iso_pi(sk)->dst, src: &iso_pi(sk)->src,
345 iso_pi(sk)->src_type);
346 if (!hdev)
347 return -EHOSTUNREACH;
348
349 hci_dev_lock(hdev);
350
351 if (!bis_capable(hdev)) {
352 err = -EOPNOTSUPP;
353 goto unlock;
354 }
355
356 /* Fail if user set invalid QoS */
357 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(qos: &iso_pi(sk)->qos)) {
358 iso_pi(sk)->qos = default_qos;
359 err = -EINVAL;
360 goto unlock;
361 }
362
363 /* Fail if out PHYs are marked as disabled */
364 if (!iso_pi(sk)->qos.bcast.out.phy) {
365 err = -EINVAL;
366 goto unlock;
367 }
368
369 /* Just bind if DEFER_SETUP has been set */
370 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
371 hcon = hci_bind_bis(hdev, dst: &iso_pi(sk)->dst, iso_pi(sk)->bc_sid,
372 qos: &iso_pi(sk)->qos, iso_pi(sk)->base_len,
373 iso_pi(sk)->base,
374 READ_ONCE(sk->sk_sndtimeo));
375 if (IS_ERR(ptr: hcon)) {
376 err = PTR_ERR(ptr: hcon);
377 goto unlock;
378 }
379 } else {
380 hcon = hci_connect_bis(hdev, dst: &iso_pi(sk)->dst,
381 dst_type: le_addr_type(iso_pi(sk)->dst_type),
382 iso_pi(sk)->bc_sid, qos: &iso_pi(sk)->qos,
383 iso_pi(sk)->base_len, iso_pi(sk)->base,
384 READ_ONCE(sk->sk_sndtimeo));
385 if (IS_ERR(ptr: hcon)) {
386 err = PTR_ERR(ptr: hcon);
387 goto unlock;
388 }
389
390 /* Update SID if it was not set */
391 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID)
392 iso_pi(sk)->bc_sid = hcon->sid;
393 }
394
395 conn = iso_conn_add(hcon);
396 if (!conn) {
397 hci_conn_drop(conn: hcon);
398 err = -ENOMEM;
399 goto unlock;
400 }
401
402 lock_sock(sk);
403
404 err = iso_chan_add(conn, sk, NULL);
405 if (err) {
406 release_sock(sk);
407 goto unlock;
408 }
409
410 /* Update source addr of the socket */
411 bacpy(dst: &iso_pi(sk)->src, src: &hcon->src);
412
413 if (hcon->state == BT_CONNECTED) {
414 iso_sock_clear_timer(sk);
415 sk->sk_state = BT_CONNECTED;
416 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
417 iso_sock_clear_timer(sk);
418 sk->sk_state = BT_CONNECT;
419 } else {
420 sk->sk_state = BT_CONNECT;
421 iso_sock_set_timer(sk, READ_ONCE(sk->sk_sndtimeo));
422 }
423
424 release_sock(sk);
425
426unlock:
427 hci_dev_unlock(hdev);
428 hci_dev_put(d: hdev);
429 return err;
430}
431
432static int iso_connect_cis(struct sock *sk)
433{
434 struct iso_conn *conn;
435 struct hci_conn *hcon;
436 struct hci_dev *hdev;
437 int err;
438
439 BT_DBG("%pMR -> %pMR", &iso_pi(sk)->src, &iso_pi(sk)->dst);
440
441 hdev = hci_get_route(dst: &iso_pi(sk)->dst, src: &iso_pi(sk)->src,
442 iso_pi(sk)->src_type);
443 if (!hdev)
444 return -EHOSTUNREACH;
445
446 hci_dev_lock(hdev);
447
448 if (!cis_central_capable(hdev)) {
449 err = -EOPNOTSUPP;
450 goto unlock;
451 }
452
453 /* Fail if user set invalid QoS */
454 if (iso_pi(sk)->qos_user_set && !check_ucast_qos(qos: &iso_pi(sk)->qos)) {
455 iso_pi(sk)->qos = default_qos;
456 err = -EINVAL;
457 goto unlock;
458 }
459
460 /* Fail if either PHYs are marked as disabled */
461 if (!iso_pi(sk)->qos.ucast.in.phy && !iso_pi(sk)->qos.ucast.out.phy) {
462 err = -EINVAL;
463 goto unlock;
464 }
465
466 /* Check if there are available buffers for output/TX. */
467 if (iso_pi(sk)->qos.ucast.out.sdu && !hci_iso_count(hdev) &&
468 (hdev->iso_pkts && !hdev->iso_cnt)) {
469 err = -ENOBUFS;
470 goto unlock;
471 }
472
473 /* Just bind if DEFER_SETUP has been set */
474 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
475 hcon = hci_bind_cis(hdev, dst: &iso_pi(sk)->dst,
476 dst_type: le_addr_type(iso_pi(sk)->dst_type),
477 qos: &iso_pi(sk)->qos,
478 READ_ONCE(sk->sk_sndtimeo));
479 if (IS_ERR(ptr: hcon)) {
480 err = PTR_ERR(ptr: hcon);
481 goto unlock;
482 }
483 } else {
484 hcon = hci_connect_cis(hdev, dst: &iso_pi(sk)->dst,
485 dst_type: le_addr_type(iso_pi(sk)->dst_type),
486 qos: &iso_pi(sk)->qos,
487 READ_ONCE(sk->sk_sndtimeo));
488 if (IS_ERR(ptr: hcon)) {
489 err = PTR_ERR(ptr: hcon);
490 goto unlock;
491 }
492 }
493
494 conn = iso_conn_add(hcon);
495 if (!conn) {
496 hci_conn_drop(conn: hcon);
497 err = -ENOMEM;
498 goto unlock;
499 }
500
501 lock_sock(sk);
502
503 err = iso_chan_add(conn, sk, NULL);
504 if (err) {
505 release_sock(sk);
506 goto unlock;
507 }
508
509 /* Update source addr of the socket */
510 bacpy(dst: &iso_pi(sk)->src, src: &hcon->src);
511
512 if (hcon->state == BT_CONNECTED) {
513 iso_sock_clear_timer(sk);
514 sk->sk_state = BT_CONNECTED;
515 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
516 iso_sock_clear_timer(sk);
517 sk->sk_state = BT_CONNECT;
518 } else {
519 sk->sk_state = BT_CONNECT;
520 iso_sock_set_timer(sk, READ_ONCE(sk->sk_sndtimeo));
521 }
522
523 release_sock(sk);
524
525unlock:
526 hci_dev_unlock(hdev);
527 hci_dev_put(d: hdev);
528 return err;
529}
530
531static struct bt_iso_qos *iso_sock_get_qos(struct sock *sk)
532{
533 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
534 return &iso_pi(sk)->conn->hcon->iso_qos;
535
536 return &iso_pi(sk)->qos;
537}
538
539static int iso_send_frame(struct sock *sk, struct sk_buff *skb,
540 const struct sockcm_cookie *sockc)
541{
542 struct iso_conn *conn = iso_pi(sk)->conn;
543 struct bt_iso_qos *qos = iso_sock_get_qos(sk);
544 struct hci_iso_data_hdr *hdr;
545 int len = 0;
546
547 BT_DBG("sk %p len %d", sk, skb->len);
548
549 if (skb->len > qos->ucast.out.sdu)
550 return -EMSGSIZE;
551
552 len = skb->len;
553
554 /* Push ISO data header */
555 hdr = skb_push(skb, HCI_ISO_DATA_HDR_SIZE);
556 hdr->sn = cpu_to_le16(conn->tx_sn++);
557 hdr->slen = cpu_to_le16(hci_iso_data_len_pack(len,
558 HCI_ISO_STATUS_VALID));
559
560 if (sk->sk_state == BT_CONNECTED) {
561 hci_setup_tx_timestamp(skb, key_offset: 1, sockc);
562 hci_send_iso(conn: conn->hcon, skb);
563 } else {
564 len = -ENOTCONN;
565 }
566
567 return len;
568}
569
570static void iso_recv_frame(struct iso_conn *conn, struct sk_buff *skb)
571{
572 struct sock *sk;
573
574 iso_conn_lock(conn);
575 sk = conn->sk;
576 iso_conn_unlock(conn);
577
578 if (!sk)
579 goto drop;
580
581 BT_DBG("sk %p len %d", sk, skb->len);
582
583 if (sk->sk_state != BT_CONNECTED)
584 goto drop;
585
586 if (!sock_queue_rcv_skb(sk, skb))
587 return;
588
589drop:
590 kfree_skb(skb);
591}
592
593/* -------- Socket interface ---------- */
594static struct sock *__iso_get_sock_listen_by_addr(bdaddr_t *src, bdaddr_t *dst)
595{
596 struct sock *sk;
597
598 sk_for_each(sk, &iso_sk_list.head) {
599 if (sk->sk_state != BT_LISTEN)
600 continue;
601
602 if (bacmp(ba1: &iso_pi(sk)->dst, ba2: dst))
603 continue;
604
605 if (!bacmp(ba1: &iso_pi(sk)->src, ba2: src))
606 return sk;
607 }
608
609 return NULL;
610}
611
612static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
613 __u8 sid)
614{
615 struct sock *sk;
616
617 sk_for_each(sk, &iso_sk_list.head) {
618 if (sk->sk_state != BT_LISTEN)
619 continue;
620
621 if (bacmp(ba1: &iso_pi(sk)->src, ba2: ba))
622 continue;
623
624 if (bacmp(ba1: &iso_pi(sk)->dst, ba2: bc))
625 continue;
626
627 if (iso_pi(sk)->bc_sid == sid)
628 return sk;
629 }
630
631 return NULL;
632}
633
634/* Find socket in given state:
635 * source bdaddr (Unicast)
636 * destination bdaddr (Broadcast only)
637 * match func - pass NULL to ignore
638 * match func data - pass -1 to ignore
639 * Returns closest match.
640 */
641static struct sock *iso_get_sock(struct hci_dev *hdev, bdaddr_t *src,
642 bdaddr_t *dst, enum bt_sock_state state,
643 iso_sock_match_t match, void *data)
644{
645 struct sock *sk = NULL, *sk1 = NULL;
646
647 read_lock(&iso_sk_list.lock);
648
649 sk_for_each(sk, &iso_sk_list.head) {
650 if (sk->sk_state != state)
651 continue;
652
653 /* Match Broadcast destination */
654 if (bacmp(ba1: dst, BDADDR_ANY) && bacmp(ba1: &iso_pi(sk)->dst, ba2: dst)) {
655 struct smp_irk *irk1, *irk2;
656
657 /* Check if destination is an RPA that we can resolve */
658 irk1 = hci_find_irk_by_rpa(hdev, rpa: dst);
659 if (!irk1)
660 continue;
661
662 /* Match with identity address */
663 if (bacmp(ba1: &iso_pi(sk)->dst, ba2: &irk1->bdaddr)) {
664 /* Check if socket destination address is also
665 * an RPA and if the IRK matches.
666 */
667 irk2 = hci_find_irk_by_rpa(hdev,
668 rpa: &iso_pi(sk)->dst);
669 if (!irk2 || irk1 != irk2)
670 continue;
671 }
672 }
673
674 /* Use Match function if provided */
675 if (match && !match(sk, data))
676 continue;
677
678 /* Exact match. */
679 if (!bacmp(ba1: &iso_pi(sk)->src, ba2: src)) {
680 sock_hold(sk);
681 break;
682 }
683
684 /* Closest match */
685 if (!bacmp(ba1: &iso_pi(sk)->src, BDADDR_ANY)) {
686 if (sk1)
687 sock_put(sk: sk1);
688
689 sk1 = sk;
690 sock_hold(sk: sk1);
691 }
692 }
693
694 if (sk && sk1)
695 sock_put(sk: sk1);
696
697 read_unlock(&iso_sk_list.lock);
698
699 return sk ? sk : sk1;
700}
701
702static struct sock *iso_get_sock_big(struct sock *match_sk, bdaddr_t *src,
703 bdaddr_t *dst, uint8_t big)
704{
705 struct sock *sk = NULL;
706
707 read_lock(&iso_sk_list.lock);
708
709 sk_for_each(sk, &iso_sk_list.head) {
710 if (match_sk == sk)
711 continue;
712
713 /* Look for sockets that have already been
714 * connected to the BIG
715 */
716 if (sk->sk_state != BT_CONNECTED &&
717 sk->sk_state != BT_CONNECT)
718 continue;
719
720 /* Match Broadcast destination */
721 if (bacmp(ba1: &iso_pi(sk)->dst, ba2: dst))
722 continue;
723
724 /* Match BIG handle */
725 if (iso_pi(sk)->qos.bcast.big != big)
726 continue;
727
728 /* Match source address */
729 if (bacmp(ba1: &iso_pi(sk)->src, ba2: src))
730 continue;
731
732 sock_hold(sk);
733 break;
734 }
735
736 read_unlock(&iso_sk_list.lock);
737
738 return sk;
739}
740
741static void iso_sock_destruct(struct sock *sk)
742{
743 BT_DBG("sk %p", sk);
744
745 iso_conn_put(iso_pi(sk)->conn);
746
747 skb_queue_purge(list: &sk->sk_receive_queue);
748 skb_queue_purge(list: &sk->sk_write_queue);
749}
750
751static void iso_sock_cleanup_listen(struct sock *parent)
752{
753 struct sock *sk;
754
755 BT_DBG("parent %p", parent);
756
757 /* Close not yet accepted channels */
758 while ((sk = bt_accept_dequeue(parent, NULL))) {
759 iso_sock_close(sk);
760 iso_sock_kill(sk);
761 }
762
763 /* If listening socket has a hcon, properly disconnect it */
764 if (iso_pi(parent)->conn && iso_pi(parent)->conn->hcon) {
765 iso_sock_disconn(sk: parent);
766 return;
767 }
768
769 parent->sk_state = BT_CLOSED;
770 sock_set_flag(sk: parent, flag: SOCK_ZAPPED);
771}
772
773/* Kill socket (only if zapped and orphan)
774 * Must be called on unlocked socket.
775 */
776static void iso_sock_kill(struct sock *sk)
777{
778 if (!sock_flag(sk, flag: SOCK_ZAPPED) || sk->sk_socket ||
779 sock_flag(sk, flag: SOCK_DEAD))
780 return;
781
782 BT_DBG("sk %p state %d", sk, sk->sk_state);
783
784 /* Sock is dead, so set conn->sk to NULL to avoid possible UAF */
785 if (iso_pi(sk)->conn) {
786 iso_conn_lock(iso_pi(sk)->conn);
787 iso_pi(sk)->conn->sk = NULL;
788 iso_conn_unlock(iso_pi(sk)->conn);
789 }
790
791 /* Kill poor orphan */
792 bt_sock_unlink(l: &iso_sk_list, s: sk);
793 sock_set_flag(sk, flag: SOCK_DEAD);
794 sock_put(sk);
795}
796
797static void iso_sock_disconn(struct sock *sk)
798{
799 struct sock *bis_sk;
800 struct hci_conn *hcon = iso_pi(sk)->conn->hcon;
801
802 if (test_bit(HCI_CONN_BIG_CREATED, &hcon->flags)) {
803 bis_sk = iso_get_sock_big(match_sk: sk, src: &iso_pi(sk)->src,
804 dst: &iso_pi(sk)->dst,
805 iso_pi(sk)->qos.bcast.big);
806
807 /* If there are any other connected sockets for the
808 * same BIG, just delete the sk and leave the bis
809 * hcon active, in case later rebinding is needed.
810 */
811 if (bis_sk) {
812 hcon->state = BT_OPEN;
813 hcon->iso_data = NULL;
814 iso_pi(sk)->conn->hcon = NULL;
815 iso_sock_clear_timer(sk);
816 iso_chan_del(sk, err: bt_to_errno(code: hcon->abort_reason));
817 sock_put(sk: bis_sk);
818 return;
819 }
820 }
821
822 sk->sk_state = BT_DISCONN;
823 iso_conn_lock(iso_pi(sk)->conn);
824 hci_conn_drop(iso_pi(sk)->conn->hcon);
825 iso_pi(sk)->conn->hcon = NULL;
826 iso_conn_unlock(iso_pi(sk)->conn);
827}
828
829static void __iso_sock_close(struct sock *sk)
830{
831 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
832
833 switch (sk->sk_state) {
834 case BT_LISTEN:
835 iso_sock_cleanup_listen(parent: sk);
836 break;
837
838 case BT_CONNECT:
839 case BT_CONNECTED:
840 case BT_CONFIG:
841 if (iso_pi(sk)->conn->hcon)
842 iso_sock_disconn(sk);
843 else
844 iso_chan_del(sk, ECONNRESET);
845 break;
846
847 case BT_CONNECT2:
848 if (iso_pi(sk)->conn->hcon &&
849 (test_bit(HCI_CONN_PA_SYNC, &iso_pi(sk)->conn->hcon->flags) ||
850 test_bit(HCI_CONN_PA_SYNC_FAILED, &iso_pi(sk)->conn->hcon->flags)))
851 iso_sock_disconn(sk);
852 else
853 iso_chan_del(sk, ECONNRESET);
854 break;
855 case BT_DISCONN:
856 iso_chan_del(sk, ECONNRESET);
857 break;
858
859 default:
860 sock_set_flag(sk, flag: SOCK_ZAPPED);
861 break;
862 }
863}
864
865/* Must be called on unlocked socket. */
866static void iso_sock_close(struct sock *sk)
867{
868 iso_sock_clear_timer(sk);
869 lock_sock(sk);
870 __iso_sock_close(sk);
871 release_sock(sk);
872 iso_sock_kill(sk);
873}
874
875static void iso_sock_init(struct sock *sk, struct sock *parent)
876{
877 BT_DBG("sk %p", sk);
878
879 if (parent) {
880 sk->sk_type = parent->sk_type;
881 bt_sk(sk)->flags = bt_sk(parent)->flags;
882 security_sk_clone(sk: parent, newsk: sk);
883 }
884}
885
886static struct proto iso_proto = {
887 .name = "ISO",
888 .owner = THIS_MODULE,
889 .obj_size = sizeof(struct iso_pinfo)
890};
891
892#define DEFAULT_IO_QOS \
893{ \
894 .interval = 10000u, \
895 .latency = 10u, \
896 .sdu = 40u, \
897 .phy = BT_ISO_PHY_2M, \
898 .rtn = 2u, \
899}
900
901static struct bt_iso_qos default_qos = {
902 .bcast = {
903 .big = BT_ISO_QOS_BIG_UNSET,
904 .bis = BT_ISO_QOS_BIS_UNSET,
905 .sync_factor = 0x01,
906 .packing = 0x00,
907 .framing = 0x00,
908 .in = DEFAULT_IO_QOS,
909 .out = DEFAULT_IO_QOS,
910 .encryption = 0x00,
911 .bcode = {0x00},
912 .options = 0x00,
913 .skip = 0x0000,
914 .sync_timeout = BT_ISO_SYNC_TIMEOUT,
915 .sync_cte_type = 0x00,
916 .mse = 0x00,
917 .timeout = BT_ISO_SYNC_TIMEOUT,
918 },
919};
920
921static struct sock *iso_sock_alloc(struct net *net, struct socket *sock,
922 int proto, gfp_t prio, int kern)
923{
924 struct sock *sk;
925
926 sk = bt_sock_alloc(net, sock, prot: &iso_proto, proto, prio, kern);
927 if (!sk)
928 return NULL;
929
930 sk->sk_destruct = iso_sock_destruct;
931 sk->sk_sndtimeo = ISO_CONN_TIMEOUT;
932
933 /* Set address type as public as default src address is BDADDR_ANY */
934 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
935
936 iso_pi(sk)->qos = default_qos;
937 iso_pi(sk)->sync_handle = -1;
938
939 bt_sock_link(l: &iso_sk_list, s: sk);
940 return sk;
941}
942
943static int iso_sock_create(struct net *net, struct socket *sock, int protocol,
944 int kern)
945{
946 struct sock *sk;
947
948 BT_DBG("sock %p", sock);
949
950 sock->state = SS_UNCONNECTED;
951
952 if (sock->type != SOCK_SEQPACKET)
953 return -ESOCKTNOSUPPORT;
954
955 sock->ops = &iso_sock_ops;
956
957 sk = iso_sock_alloc(net, sock, proto: protocol, GFP_ATOMIC, kern);
958 if (!sk)
959 return -ENOMEM;
960
961 iso_sock_init(sk, NULL);
962 return 0;
963}
964
965static int iso_sock_bind_bc(struct socket *sock, struct sockaddr_unsized *addr,
966 int addr_len)
967{
968 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
969 struct sock *sk = sock->sk;
970 int i;
971
972 BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid,
973 sa->iso_bc->bc_num_bis);
974
975 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc))
976 return -EINVAL;
977
978 bacpy(dst: &iso_pi(sk)->dst, src: &sa->iso_bc->bc_bdaddr);
979
980 /* Check if the address type is of LE type */
981 if (!bdaddr_type_is_le(type: sa->iso_bc->bc_bdaddr_type))
982 return -EINVAL;
983
984 iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
985
986 if (sa->iso_bc->bc_sid > 0x0f && sa->iso_bc->bc_sid != HCI_SID_INVALID)
987 return -EINVAL;
988
989 iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
990
991 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS)
992 return -EINVAL;
993
994 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
995
996 for (i = 0; i < iso_pi(sk)->bc_num_bis; i++)
997 if (sa->iso_bc->bc_bis[i] < 0x01 ||
998 sa->iso_bc->bc_bis[i] > 0x1f)
999 return -EINVAL;
1000
1001 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
1002 iso_pi(sk)->bc_num_bis);
1003
1004 return 0;
1005}
1006
1007/* Must be called on the locked socket. */
1008static int iso_sock_rebind_bis(struct sock *sk, struct sockaddr_iso *sa,
1009 int addr_len)
1010{
1011 int err = 0;
1012
1013 if (!test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags))
1014 return -EBADFD;
1015
1016 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS) {
1017 err = -EINVAL;
1018 goto done;
1019 }
1020
1021 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
1022
1023 for (int i = 0; i < iso_pi(sk)->bc_num_bis; i++)
1024 if (sa->iso_bc->bc_bis[i] < 0x01 ||
1025 sa->iso_bc->bc_bis[i] > 0x1f) {
1026 err = -EINVAL;
1027 goto done;
1028 }
1029
1030 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
1031 iso_pi(sk)->bc_num_bis);
1032
1033done:
1034 return err;
1035}
1036
1037static struct hci_dev *iso_conn_get_hdev(struct iso_conn *conn)
1038{
1039 struct hci_dev *hdev = NULL;
1040
1041 iso_conn_lock(conn);
1042 if (conn->hcon)
1043 hdev = hci_dev_hold(d: conn->hcon->hdev);
1044 iso_conn_unlock(conn);
1045
1046 return hdev;
1047}
1048
1049/* Must be called on the locked socket. */
1050static int iso_sock_rebind_bc(struct sock *sk, struct sockaddr_iso *sa,
1051 int addr_len)
1052{
1053 struct hci_dev *hdev;
1054 struct hci_conn *bis;
1055 int err;
1056
1057 if (sk->sk_type != SOCK_SEQPACKET || !iso_pi(sk)->conn)
1058 return -EINVAL;
1059
1060 /* Check if it is really a Broadcast address being requested */
1061 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc))
1062 return -EINVAL;
1063
1064 /* Check if the address hasn't changed then perhaps only the number of
1065 * bis has changed.
1066 */
1067 if (!bacmp(ba1: &iso_pi(sk)->dst, ba2: &sa->iso_bc->bc_bdaddr) ||
1068 !bacmp(ba1: &sa->iso_bc->bc_bdaddr, BDADDR_ANY))
1069 return iso_sock_rebind_bis(sk, sa, addr_len);
1070
1071 /* Check if the address type is of LE type */
1072 if (!bdaddr_type_is_le(type: sa->iso_bc->bc_bdaddr_type))
1073 return -EINVAL;
1074
1075 hdev = iso_conn_get_hdev(iso_pi(sk)->conn);
1076 if (!hdev)
1077 return -EINVAL;
1078
1079 bis = iso_pi(sk)->conn->hcon;
1080
1081 /* Release the socket before lookups since that requires hci_dev_lock
1082 * which shall not be acquired while holding sock_lock for proper
1083 * ordering.
1084 */
1085 release_sock(sk);
1086 hci_dev_lock(bis->hdev);
1087 lock_sock(sk);
1088
1089 if (!iso_pi(sk)->conn || iso_pi(sk)->conn->hcon != bis) {
1090 /* raced with iso_conn_del() or iso_disconn_sock() */
1091 err = -ENOTCONN;
1092 goto unlock;
1093 }
1094
1095 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bc->bc_bdaddr,
1096 sa->iso_bc->bc_bdaddr_type);
1097
1098 err = hci_past_bis(conn: bis, dst: &sa->iso_bc->bc_bdaddr,
1099 dst_type: le_addr_type(bdaddr_type: sa->iso_bc->bc_bdaddr_type));
1100
1101unlock:
1102 hci_dev_unlock(hdev);
1103 hci_dev_put(d: hdev);
1104
1105 return err;
1106}
1107
1108static int iso_sock_bind(struct socket *sock, struct sockaddr_unsized *addr,
1109 int addr_len)
1110{
1111 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1112 struct sock *sk = sock->sk;
1113 int err = 0;
1114
1115 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type);
1116
1117 if (!addr || addr_len < sizeof(struct sockaddr_iso) ||
1118 addr->sa_family != AF_BLUETOOTH)
1119 return -EINVAL;
1120
1121 lock_sock(sk);
1122
1123 if ((sk->sk_state == BT_CONNECT2 || sk->sk_state == BT_CONNECTED) &&
1124 addr_len > sizeof(*sa)) {
1125 /* Allow the user to rebind to a different address using
1126 * PAST procedures.
1127 */
1128 err = iso_sock_rebind_bc(sk, sa, addr_len);
1129 goto done;
1130 }
1131
1132 if (sk->sk_state != BT_OPEN) {
1133 err = -EBADFD;
1134 goto done;
1135 }
1136
1137 if (sk->sk_type != SOCK_SEQPACKET) {
1138 err = -EINVAL;
1139 goto done;
1140 }
1141
1142 /* Check if the address type is of LE type */
1143 if (!bdaddr_type_is_le(type: sa->iso_bdaddr_type)) {
1144 err = -EINVAL;
1145 goto done;
1146 }
1147
1148 bacpy(dst: &iso_pi(sk)->src, src: &sa->iso_bdaddr);
1149 iso_pi(sk)->src_type = sa->iso_bdaddr_type;
1150
1151 /* Check for Broadcast address */
1152 if (addr_len > sizeof(*sa)) {
1153 err = iso_sock_bind_bc(sock, addr, addr_len);
1154 if (err)
1155 goto done;
1156 }
1157
1158 sk->sk_state = BT_BOUND;
1159
1160done:
1161 release_sock(sk);
1162 return err;
1163}
1164
1165static int iso_sock_connect(struct socket *sock, struct sockaddr_unsized *addr,
1166 int alen, int flags)
1167{
1168 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1169 struct sock *sk = sock->sk;
1170 int err;
1171
1172 BT_DBG("sk %p", sk);
1173
1174 if (alen < sizeof(struct sockaddr_iso) ||
1175 addr->sa_family != AF_BLUETOOTH)
1176 return -EINVAL;
1177
1178 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
1179 return -EBADFD;
1180
1181 if (sk->sk_type != SOCK_SEQPACKET)
1182 return -EINVAL;
1183
1184 /* Check if the address type is of LE type */
1185 if (!bdaddr_type_is_le(type: sa->iso_bdaddr_type))
1186 return -EINVAL;
1187
1188 lock_sock(sk);
1189
1190 bacpy(dst: &iso_pi(sk)->dst, src: &sa->iso_bdaddr);
1191 iso_pi(sk)->dst_type = sa->iso_bdaddr_type;
1192
1193 release_sock(sk);
1194
1195 if (bacmp(ba1: &iso_pi(sk)->dst, BDADDR_ANY))
1196 err = iso_connect_cis(sk);
1197 else
1198 err = iso_connect_bis(sk);
1199
1200 if (err)
1201 return err;
1202
1203 lock_sock(sk);
1204
1205 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1206 err = bt_sock_wait_state(sk, state: BT_CONNECTED,
1207 timeo: sock_sndtimeo(sk, noblock: flags & O_NONBLOCK));
1208 }
1209
1210 release_sock(sk);
1211 return err;
1212}
1213
1214static int iso_listen_bis(struct sock *sk)
1215{
1216 struct hci_dev *hdev;
1217 int err = 0;
1218 struct iso_conn *conn;
1219 struct hci_conn *hcon;
1220
1221 BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &iso_pi(sk)->src,
1222 &iso_pi(sk)->dst, iso_pi(sk)->bc_sid);
1223
1224 write_lock(&iso_sk_list.lock);
1225
1226 if (__iso_get_sock_listen_by_sid(ba: &iso_pi(sk)->src, bc: &iso_pi(sk)->dst,
1227 iso_pi(sk)->bc_sid))
1228 err = -EADDRINUSE;
1229
1230 write_unlock(&iso_sk_list.lock);
1231
1232 if (err)
1233 return err;
1234
1235 hdev = hci_get_route(dst: &iso_pi(sk)->dst, src: &iso_pi(sk)->src,
1236 iso_pi(sk)->src_type);
1237 if (!hdev)
1238 return -EHOSTUNREACH;
1239
1240 hci_dev_lock(hdev);
1241 lock_sock(sk);
1242
1243 /* Fail if user set invalid QoS */
1244 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(qos: &iso_pi(sk)->qos)) {
1245 iso_pi(sk)->qos = default_qos;
1246 err = -EINVAL;
1247 goto unlock;
1248 }
1249
1250 hcon = hci_pa_create_sync(hdev, dst: &iso_pi(sk)->dst,
1251 dst_type: le_addr_type(iso_pi(sk)->dst_type),
1252 iso_pi(sk)->bc_sid, qos: &iso_pi(sk)->qos);
1253 if (IS_ERR(ptr: hcon)) {
1254 err = PTR_ERR(ptr: hcon);
1255 goto unlock;
1256 }
1257
1258 conn = iso_conn_add(hcon);
1259 if (!conn) {
1260 hci_conn_drop(conn: hcon);
1261 err = -ENOMEM;
1262 goto unlock;
1263 }
1264
1265 err = iso_chan_add(conn, sk, NULL);
1266 if (err) {
1267 hci_conn_drop(conn: hcon);
1268 goto unlock;
1269 }
1270
1271unlock:
1272 release_sock(sk);
1273 hci_dev_unlock(hdev);
1274 hci_dev_put(d: hdev);
1275 return err;
1276}
1277
1278static int iso_listen_cis(struct sock *sk)
1279{
1280 int err = 0;
1281
1282 BT_DBG("%pMR", &iso_pi(sk)->src);
1283
1284 write_lock(&iso_sk_list.lock);
1285
1286 if (__iso_get_sock_listen_by_addr(src: &iso_pi(sk)->src, dst: &iso_pi(sk)->dst))
1287 err = -EADDRINUSE;
1288
1289 write_unlock(&iso_sk_list.lock);
1290
1291 return err;
1292}
1293
1294static int iso_sock_listen(struct socket *sock, int backlog)
1295{
1296 struct sock *sk = sock->sk;
1297 int err = 0;
1298
1299 BT_DBG("sk %p backlog %d", sk, backlog);
1300
1301 sock_hold(sk);
1302 lock_sock(sk);
1303
1304 if (sk->sk_state != BT_BOUND) {
1305 err = -EBADFD;
1306 goto done;
1307 }
1308
1309 if (sk->sk_type != SOCK_SEQPACKET) {
1310 err = -EINVAL;
1311 goto done;
1312 }
1313
1314 if (!bacmp(ba1: &iso_pi(sk)->dst, BDADDR_ANY)) {
1315 err = iso_listen_cis(sk);
1316 } else {
1317 /* Drop sock lock to avoid potential
1318 * deadlock with the hdev lock.
1319 */
1320 release_sock(sk);
1321 err = iso_listen_bis(sk);
1322 lock_sock(sk);
1323 }
1324
1325 if (err)
1326 goto done;
1327
1328 sk->sk_max_ack_backlog = backlog;
1329 sk->sk_ack_backlog = 0;
1330
1331 sk->sk_state = BT_LISTEN;
1332
1333done:
1334 release_sock(sk);
1335 sock_put(sk);
1336 return err;
1337}
1338
1339static int iso_sock_accept(struct socket *sock, struct socket *newsock,
1340 struct proto_accept_arg *arg)
1341{
1342 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1343 struct sock *sk = sock->sk, *ch;
1344 long timeo;
1345 int err = 0;
1346
1347 /* Use explicit nested locking to avoid lockdep warnings generated
1348 * because the parent socket and the child socket are locked on the
1349 * same thread.
1350 */
1351 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1352
1353 timeo = sock_rcvtimeo(sk, noblock: arg->flags & O_NONBLOCK);
1354
1355 BT_DBG("sk %p timeo %ld", sk, timeo);
1356
1357 /* Wait for an incoming connection. (wake-one). */
1358 add_wait_queue_exclusive(wq_head: sk_sleep(sk), wq_entry: &wait);
1359 while (1) {
1360 if (sk->sk_state != BT_LISTEN) {
1361 err = -EBADFD;
1362 break;
1363 }
1364
1365 ch = bt_accept_dequeue(parent: sk, newsock);
1366 if (ch)
1367 break;
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(wq_entry: &wait, TASK_INTERRUPTIBLE, timeout: timeo);
1382 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1383 }
1384 remove_wait_queue(wq_head: sk_sleep(sk), wq_entry: &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(nr: BT_SK_DEFER_SETUP, addr: &bt_sk(sk)->flags);
1424 clear_bit(nr: BT_SK_BIG_SYNC, addr: &iso_pi(sk)->flags);
1425 sk->sk_state = BT_CONNECTED;
1426 }
1427 }
1428
1429done:
1430 release_sock(sk);
1431 return err;
1432}
1433
1434static 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(dst: &sa->iso_bdaddr, src: &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(dst: &sa->iso_bdaddr, src: &iso_pi(sk)->src);
1461 sa->iso_bdaddr_type = iso_pi(sk)->src_type;
1462 }
1463
1464 return len;
1465}
1466
1467static 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: &sockc, sk);
1486
1487 if (msg->msg_controllen) {
1488 err = sock_cmsg_send(sk, msg, sockc: &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, tailroom: 0);
1505 if (IS_ERR(ptr: skb))
1506 return PTR_ERR(ptr: 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, headroom: 0, tailroom: 0);
1518 if (IS_ERR(ptr: tmp)) {
1519 kfree_skb(skb);
1520 return PTR_ERR(ptr: 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: &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
1549static 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, plen: sizeof(cp), param: &cp);
1561}
1562
1563static void iso_conn_big_sync(struct sock *sk)
1564{
1565 int err;
1566 struct hci_dev *hdev;
1567
1568 hdev = hci_get_route(dst: &iso_pi(sk)->dst, src: &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(nr: BT_SK_BIG_SYNC, addr: &iso_pi(sk)->flags)) {
1583 err = hci_conn_big_create_sync(hdev, iso_pi(sk)->conn->hcon,
1584 qos: &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
1596static 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(nr: BT_SK_DEFER_SETUP, addr: &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(conn: 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
1661static bool check_io_qos(struct bt_iso_io_qos *qos)
1662{
1663 /* If no PHY is enable SDU must be 0 */
1664 if (!qos->phy && 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->phy > BT_ISO_PHY_ANY)
1674 return false;
1675
1676 return true;
1677}
1678
1679static 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: &qos->ucast.in))
1697 return false;
1698
1699 if (!check_io_qos(qos: &qos->ucast.out))
1700 return false;
1701
1702 return true;
1703}
1704
1705static 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: &qos->bcast.in))
1717 return false;
1718
1719 if (!check_io_qos(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
1752static 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(dst: &opt, ksize: sizeof(opt), optval, optlen);
1772 if (err)
1773 break;
1774
1775 if (opt)
1776 set_bit(nr: BT_SK_DEFER_SETUP, addr: &bt_sk(sk)->flags);
1777 else
1778 clear_bit(nr: BT_SK_DEFER_SETUP, addr: &bt_sk(sk)->flags);
1779 break;
1780
1781 case BT_PKT_STATUS:
1782 err = copy_safe_from_sockptr(dst: &opt, ksize: sizeof(opt), optval, optlen);
1783 if (err)
1784 break;
1785
1786 if (opt)
1787 set_bit(nr: BT_SK_PKT_STATUS, addr: &bt_sk(sk)->flags);
1788 else
1789 clear_bit(nr: BT_SK_PKT_STATUS, addr: &bt_sk(sk)->flags);
1790 break;
1791
1792 case BT_PKT_SEQNUM:
1793 err = copy_safe_from_sockptr(dst: &opt, ksize: sizeof(opt), optval, optlen);
1794 if (err)
1795 break;
1796
1797 if (opt)
1798 set_bit(nr: BT_SK_PKT_SEQNUM, addr: &bt_sk(sk)->flags);
1799 else
1800 clear_bit(nr: BT_SK_PKT_SEQNUM, addr: &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(dst: &qos, ksize: 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, ksize: 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
1851static 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(to: optval, from: qos, n: len))
1891 err = -EFAULT;
1892
1893 break;
1894
1895 case BT_ISO_BASE:
1896 if (sk->sk_state == BT_CONNECTED &&
1897 !bacmp(ba1: &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(to: optval, from: base, n: 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
1922static 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, flag: SOCK_LINGER) && sk->sk_lingertime &&
1957 !(current->flags & PF_EXITING))
1958 err = bt_sock_wait_state(sk, state: BT_CLOSED, timeo: sk->sk_lingertime);
1959
1960unlock:
1961 release_sock(sk);
1962 sock_put(sk);
1963
1964 return err;
1965}
1966
1967static 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, flag: SOCK_LINGER) && READ_ONCE(sk->sk_lingertime) &&
1980 !(current->flags & PF_EXITING)) {
1981 lock_sock(sk);
1982 err = bt_sock_wait_state(sk, state: BT_CLOSED, timeo: sk->sk_lingertime);
1983 release_sock(sk);
1984 }
1985
1986 sock_orphan(sk);
1987 iso_sock_kill(sk);
1988 return err;
1989}
1990
1991static 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
2005static 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
2012static 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
2019static 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
2024static bool iso_match_dst(struct sock *sk, void *data)
2025{
2026 return !bacmp(ba1: &iso_pi(sk)->dst, ba2: (bdaddr_t *)data);
2027}
2028
2029static 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(ba1: &conn->hcon->dst, BDADDR_ANY)) {
2048 struct hci_conn *bis = conn->hcon;
2049 struct adv_info *adv;
2050
2051 adv = hci_find_adv_instance(hdev: bis->hdev,
2052 instance: bis->iso_qos.bcast.bis);
2053 if (adv && bacmp(ba1: &adv->random_addr, BDADDR_ANY)) {
2054 lock_sock(sk);
2055 iso_pi(sk)->src_type = BDADDR_LE_RANDOM;
2056 bacpy(dst: &iso_pi(sk)->src, src: &adv->random_addr);
2057 release_sock(sk);
2058 }
2059 }
2060
2061 iso_sock_ready(sk: 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, src: &hcon->src, dst: &hcon->dst,
2076 state: BT_LISTEN, match: iso_match_big_hcon,
2077 data: hcon);
2078 } else if (test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags)) {
2079 ev = hci_recv_event_data(hdev: 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, src: &hcon->src, dst: &hcon->dst,
2084 state: BT_LISTEN,
2085 match: iso_match_pa_sync_flag,
2086 NULL);
2087 if (!parent && ev)
2088 parent = iso_get_sock(hdev, src: &hcon->src,
2089 dst: &hcon->dst,
2090 state: BT_LISTEN,
2091 match: iso_match_big, data: ev);
2092 } else if (test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
2093 ev2 = hci_recv_event_data(hdev: hcon->hdev,
2094 HCI_EV_LE_PA_SYNC_ESTABLISHED);
2095 if (ev2)
2096 parent = iso_get_sock(hdev, src: &hcon->src,
2097 dst: &hcon->dst,
2098 state: BT_LISTEN,
2099 match: iso_match_sid, data: ev2);
2100 } else if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) {
2101 ev3 = hci_recv_event_data(hdev: hcon->hdev,
2102 HCI_EV_LE_PER_ADV_REPORT);
2103 if (ev3)
2104 parent = iso_get_sock(hdev, src: &hcon->src,
2105 dst: &hcon->dst,
2106 state: BT_LISTEN,
2107 match: iso_match_sync_handle_pa_report,
2108 data: ev3);
2109 }
2110
2111 if (!parent)
2112 parent = iso_get_sock(hdev, src: &hcon->src, BDADDR_ANY,
2113 state: BT_LISTEN, match: iso_match_dst, BDADDR_ANY);
2114
2115 if (!parent)
2116 return;
2117
2118 lock_sock(sk: parent);
2119
2120 sk = iso_sock_alloc(net: sock_net(sk: parent), NULL,
2121 BTPROTO_ISO, GFP_ATOMIC, kern: 0);
2122 if (!sk) {
2123 release_sock(sk: parent);
2124 return;
2125 }
2126
2127 iso_sock_init(sk, parent);
2128
2129 bacpy(dst: &iso_pi(sk)->src, 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(ba1: &hcon->dst, BDADDR_ANY)) {
2143 bacpy(dst: &hcon->dst, src: &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(nr: BT_SK_PA_SYNC, addr: &iso_pi(sk)->flags);
2155 }
2156
2157 bacpy(dst: &iso_pi(sk)->dst, src: &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(conn: 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(sk: parent);
2188 sock_put(sk: parent);
2189 }
2190}
2191
2192static 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
2202static 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
2212static 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
2219static 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
2228int 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, src: &hdev->bdaddr, dst: bdaddr, state: BT_LISTEN,
2256 match: iso_match_sid, data: ev1);
2257 if (sk && !ev1->status) {
2258 iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);
2259 iso_pi(sk)->bc_sid = ev1->sid;
2260 }
2261
2262 goto done;
2263 }
2264
2265 ev1a = hci_recv_event_data(hdev, HCI_EV_LE_PAST_RECEIVED);
2266 if (ev1a) {
2267 sk = iso_get_sock(hdev, src: &hdev->bdaddr, dst: bdaddr, state: BT_LISTEN,
2268 match: iso_match_sid_past, data: ev1a);
2269 if (sk && !ev1a->status) {
2270 iso_pi(sk)->sync_handle = le16_to_cpu(ev1a->sync_handle);
2271 iso_pi(sk)->bc_sid = ev1a->sid;
2272 }
2273
2274 goto done;
2275 }
2276
2277 ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT);
2278 if (ev2) {
2279 /* Check if BIGInfo report has already been handled */
2280 sk = iso_get_sock(hdev, src: &hdev->bdaddr, dst: bdaddr, state: BT_CONNECTED,
2281 match: iso_match_sync_handle, data: ev2);
2282 if (sk) {
2283 sock_put(sk);
2284 sk = NULL;
2285 goto done;
2286 }
2287
2288 /* Try to get PA sync socket, if it exists */
2289 sk = iso_get_sock(hdev, src: &hdev->bdaddr, dst: bdaddr, state: BT_CONNECT2,
2290 match: iso_match_sync_handle, data: ev2);
2291 if (!sk)
2292 sk = iso_get_sock(hdev, src: &hdev->bdaddr, dst: bdaddr,
2293 state: BT_LISTEN,
2294 match: iso_match_sync_handle,
2295 data: ev2);
2296
2297 if (sk) {
2298 int err;
2299 struct hci_conn *hcon = iso_pi(sk)->conn->hcon;
2300
2301 iso_pi(sk)->qos.bcast.encryption = ev2->encryption;
2302
2303 if (ev2->num_bis < iso_pi(sk)->bc_num_bis)
2304 iso_pi(sk)->bc_num_bis = ev2->num_bis;
2305
2306 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags) &&
2307 !test_and_set_bit(nr: BT_SK_BIG_SYNC, addr: &iso_pi(sk)->flags)) {
2308 err = hci_conn_big_create_sync(hdev, hcon,
2309 qos: &iso_pi(sk)->qos,
2310 iso_pi(sk)->sync_handle,
2311 iso_pi(sk)->bc_num_bis,
2312 iso_pi(sk)->bc_bis);
2313 if (err) {
2314 bt_dev_err(hdev, "hci_le_big_create_sync: %d",
2315 err);
2316 sock_put(sk);
2317 sk = NULL;
2318 }
2319 }
2320 }
2321
2322 goto done;
2323 }
2324
2325 ev3 = hci_recv_event_data(hdev, HCI_EV_LE_PER_ADV_REPORT);
2326 if (ev3) {
2327 size_t base_len = 0;
2328 u8 *base;
2329 struct hci_conn *hcon;
2330
2331 sk = iso_get_sock(hdev, src: &hdev->bdaddr, dst: bdaddr, state: BT_LISTEN,
2332 match: iso_match_sync_handle_pa_report, data: ev3);
2333 if (!sk)
2334 goto done;
2335
2336 hcon = iso_pi(sk)->conn->hcon;
2337 if (!hcon)
2338 goto done;
2339
2340 if (ev3->data_status == LE_PA_DATA_TRUNCATED) {
2341 /* The controller was unable to retrieve PA data. */
2342 memset(hcon->le_per_adv_data, 0,
2343 HCI_MAX_PER_AD_TOT_LEN);
2344 hcon->le_per_adv_data_len = 0;
2345 hcon->le_per_adv_data_offset = 0;
2346 goto done;
2347 }
2348
2349 if (hcon->le_per_adv_data_offset + ev3->length >
2350 HCI_MAX_PER_AD_TOT_LEN)
2351 goto done;
2352
2353 memcpy(hcon->le_per_adv_data + hcon->le_per_adv_data_offset,
2354 ev3->data, ev3->length);
2355 hcon->le_per_adv_data_offset += ev3->length;
2356
2357 if (ev3->data_status == LE_PA_DATA_COMPLETE) {
2358 /* All PA data has been received. */
2359 hcon->le_per_adv_data_len =
2360 hcon->le_per_adv_data_offset;
2361 hcon->le_per_adv_data_offset = 0;
2362
2363 /* Extract BASE */
2364 base = eir_get_service_data(eir: hcon->le_per_adv_data,
2365 eir_len: hcon->le_per_adv_data_len,
2366 EIR_BAA_SERVICE_UUID,
2367 len: &base_len);
2368
2369 if (!base || base_len > BASE_MAX_LENGTH)
2370 goto done;
2371
2372 memcpy(iso_pi(sk)->base, base, base_len);
2373 iso_pi(sk)->base_len = base_len;
2374 } else {
2375 /* This is a PA data fragment. Keep pa_data_len set to 0
2376 * until all data has been reassembled.
2377 */
2378 hcon->le_per_adv_data_len = 0;
2379 }
2380 } else {
2381 sk = iso_get_sock(hdev, src: &hdev->bdaddr, BDADDR_ANY,
2382 state: BT_LISTEN, match: iso_match_dst, BDADDR_ANY);
2383 }
2384
2385done:
2386 if (!sk)
2387 return 0;
2388
2389 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
2390 *flags |= HCI_PROTO_DEFER;
2391
2392 sock_put(sk);
2393
2394 return HCI_LM_ACCEPT;
2395}
2396
2397static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
2398{
2399 if (hcon->type != CIS_LINK && hcon->type != BIS_LINK &&
2400 hcon->type != PA_LINK) {
2401 if (hcon->type != LE_LINK)
2402 return;
2403
2404 /* Check if LE link has failed */
2405 if (status) {
2406 struct hci_link *link, *t;
2407
2408 list_for_each_entry_safe(link, t, &hcon->link_list,
2409 list)
2410 iso_conn_del(hcon: link->conn, err: bt_to_errno(code: status));
2411
2412 return;
2413 }
2414
2415 /* Create CIS if pending */
2416 hci_le_create_cis_pending(hdev: hcon->hdev);
2417 return;
2418 }
2419
2420 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
2421
2422 /* Similar to the success case, if HCI_CONN_BIG_SYNC_FAILED or
2423 * HCI_CONN_PA_SYNC_FAILED is set, queue the failed connection
2424 * into the accept queue of the listening socket and wake up
2425 * userspace, to inform the user about the event.
2426 */
2427 if (!status || test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags) ||
2428 test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
2429 struct iso_conn *conn;
2430
2431 conn = iso_conn_add(hcon);
2432 if (conn)
2433 iso_conn_ready(conn);
2434 } else {
2435 iso_conn_del(hcon, err: bt_to_errno(code: status));
2436 }
2437}
2438
2439static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
2440{
2441 if (hcon->type != CIS_LINK && hcon->type != BIS_LINK &&
2442 hcon->type != PA_LINK)
2443 return;
2444
2445 BT_DBG("hcon %p reason %d", hcon, reason);
2446
2447 iso_conn_del(hcon, err: bt_to_errno(code: reason));
2448}
2449
2450int iso_recv(struct hci_dev *hdev, u16 handle, struct sk_buff *skb, u16 flags)
2451{
2452 struct hci_conn *hcon;
2453 struct iso_conn *conn;
2454 struct skb_shared_hwtstamps *hwts;
2455 __u16 pb, ts, len, sn;
2456
2457 hci_dev_lock(hdev);
2458
2459 hcon = hci_conn_hash_lookup_handle(hdev, handle);
2460 if (!hcon) {
2461 hci_dev_unlock(hdev);
2462 kfree_skb(skb);
2463 return -ENOENT;
2464 }
2465
2466 conn = iso_conn_hold_unless_zero(conn: hcon->iso_data);
2467 hcon = NULL;
2468
2469 hci_dev_unlock(hdev);
2470
2471 if (!conn) {
2472 kfree_skb(skb);
2473 return -EINVAL;
2474 }
2475
2476 pb = hci_iso_flags_pb(flags);
2477 ts = hci_iso_flags_ts(flags);
2478
2479 BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);
2480
2481 switch (pb) {
2482 case ISO_START:
2483 case ISO_SINGLE:
2484 if (conn->rx_len) {
2485 BT_ERR("Unexpected start frame (len %d)", skb->len);
2486 kfree_skb(skb: conn->rx_skb);
2487 conn->rx_skb = NULL;
2488 conn->rx_len = 0;
2489 }
2490
2491 if (ts) {
2492 struct hci_iso_ts_data_hdr *hdr;
2493
2494 hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
2495 if (!hdr) {
2496 BT_ERR("Frame is too short (len %d)", skb->len);
2497 goto drop;
2498 }
2499
2500 /* Record the timestamp to skb */
2501 hwts = skb_hwtstamps(skb);
2502 hwts->hwtstamp = us_to_ktime(le32_to_cpu(hdr->ts));
2503
2504 sn = __le16_to_cpu(hdr->sn);
2505 len = __le16_to_cpu(hdr->slen);
2506 } else {
2507 struct hci_iso_data_hdr *hdr;
2508
2509 hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
2510 if (!hdr) {
2511 BT_ERR("Frame is too short (len %d)", skb->len);
2512 goto drop;
2513 }
2514
2515 sn = __le16_to_cpu(hdr->sn);
2516 len = __le16_to_cpu(hdr->slen);
2517 }
2518
2519 flags = hci_iso_data_flags(len);
2520 len = hci_iso_data_len(len);
2521
2522 BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x sn %d",
2523 len, skb->len, flags, sn);
2524
2525 if (len == skb->len) {
2526 /* Complete frame received */
2527 hci_skb_pkt_status(skb) = flags & 0x03;
2528 hci_skb_pkt_seqnum(skb) = sn;
2529 iso_recv_frame(conn, skb);
2530 goto done;
2531 }
2532
2533 if (pb == ISO_SINGLE) {
2534 BT_ERR("Frame malformed (len %d, expected len %d)",
2535 skb->len, len);
2536 goto drop;
2537 }
2538
2539 if (skb->len > len) {
2540 BT_ERR("Frame is too long (len %d, expected len %d)",
2541 skb->len, len);
2542 goto drop;
2543 }
2544
2545 /* Allocate skb for the complete frame (with header) */
2546 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
2547 if (!conn->rx_skb)
2548 goto drop;
2549
2550 hci_skb_pkt_status(conn->rx_skb) = flags & 0x03;
2551 hci_skb_pkt_seqnum(conn->rx_skb) = sn;
2552 skb_copy_from_linear_data(skb, to: skb_put(skb: conn->rx_skb, len: skb->len),
2553 len: skb->len);
2554 conn->rx_len = len - skb->len;
2555
2556 /* Copy hw timestamp from skb to rx_skb if present */
2557 if (ts) {
2558 hwts = skb_hwtstamps(skb: conn->rx_skb);
2559 hwts->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
2560 }
2561
2562 break;
2563
2564 case ISO_CONT:
2565 BT_DBG("Cont: frag len %d (expecting %d)", skb->len,
2566 conn->rx_len);
2567
2568 if (!conn->rx_len) {
2569 BT_ERR("Unexpected continuation frame (len %d)",
2570 skb->len);
2571 goto drop;
2572 }
2573
2574 if (skb->len > conn->rx_len) {
2575 BT_ERR("Fragment is too long (len %d, expected %d)",
2576 skb->len, conn->rx_len);
2577 kfree_skb(skb: conn->rx_skb);
2578 conn->rx_skb = NULL;
2579 conn->rx_len = 0;
2580 goto drop;
2581 }
2582
2583 skb_copy_from_linear_data(skb, to: skb_put(skb: conn->rx_skb, len: skb->len),
2584 len: skb->len);
2585 conn->rx_len -= skb->len;
2586 break;
2587
2588 case ISO_END:
2589 skb_copy_from_linear_data(skb, to: skb_put(skb: conn->rx_skb, len: skb->len),
2590 len: skb->len);
2591 conn->rx_len -= skb->len;
2592
2593 if (!conn->rx_len) {
2594 struct sk_buff *rx_skb = conn->rx_skb;
2595
2596 /* Complete frame received. iso_recv_frame
2597 * takes ownership of the skb so set the global
2598 * rx_skb pointer to NULL first.
2599 */
2600 conn->rx_skb = NULL;
2601 iso_recv_frame(conn, skb: rx_skb);
2602 }
2603 break;
2604 }
2605
2606drop:
2607 kfree_skb(skb);
2608done:
2609 iso_conn_put(conn);
2610 return 0;
2611}
2612
2613static struct hci_cb iso_cb = {
2614 .name = "ISO",
2615 .connect_cfm = iso_connect_cfm,
2616 .disconn_cfm = iso_disconn_cfm,
2617};
2618
2619static int iso_debugfs_show(struct seq_file *f, void *p)
2620{
2621 struct sock *sk;
2622
2623 read_lock(&iso_sk_list.lock);
2624
2625 sk_for_each(sk, &iso_sk_list.head) {
2626 seq_printf(m: f, fmt: "%pMR %pMR %d\n", &iso_pi(sk)->src,
2627 &iso_pi(sk)->dst, sk->sk_state);
2628 }
2629
2630 read_unlock(&iso_sk_list.lock);
2631
2632 return 0;
2633}
2634
2635DEFINE_SHOW_ATTRIBUTE(iso_debugfs);
2636
2637static struct dentry *iso_debugfs;
2638
2639static const struct proto_ops iso_sock_ops = {
2640 .family = PF_BLUETOOTH,
2641 .owner = THIS_MODULE,
2642 .release = iso_sock_release,
2643 .bind = iso_sock_bind,
2644 .connect = iso_sock_connect,
2645 .listen = iso_sock_listen,
2646 .accept = iso_sock_accept,
2647 .getname = iso_sock_getname,
2648 .sendmsg = iso_sock_sendmsg,
2649 .recvmsg = iso_sock_recvmsg,
2650 .poll = bt_sock_poll,
2651 .ioctl = bt_sock_ioctl,
2652 .mmap = sock_no_mmap,
2653 .socketpair = sock_no_socketpair,
2654 .shutdown = iso_sock_shutdown,
2655 .setsockopt = iso_sock_setsockopt,
2656 .getsockopt = iso_sock_getsockopt
2657};
2658
2659static const struct net_proto_family iso_sock_family_ops = {
2660 .family = PF_BLUETOOTH,
2661 .owner = THIS_MODULE,
2662 .create = iso_sock_create,
2663};
2664
2665static bool inited;
2666
2667bool iso_inited(void)
2668{
2669 return inited;
2670}
2671
2672int iso_init(void)
2673{
2674 int err;
2675
2676 BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr));
2677
2678 if (inited)
2679 return -EALREADY;
2680
2681 err = proto_register(prot: &iso_proto, alloc_slab: 0);
2682 if (err < 0)
2683 return err;
2684
2685 err = bt_sock_register(BTPROTO_ISO, ops: &iso_sock_family_ops);
2686 if (err < 0) {
2687 BT_ERR("ISO socket registration failed");
2688 goto error;
2689 }
2690
2691 err = bt_procfs_init(net: &init_net, name: "iso", sk_list: &iso_sk_list, NULL);
2692 if (err < 0) {
2693 BT_ERR("Failed to create ISO proc file");
2694 bt_sock_unregister(BTPROTO_ISO);
2695 goto error;
2696 }
2697
2698 BT_INFO("ISO socket layer initialized");
2699
2700 hci_register_cb(hcb: &iso_cb);
2701
2702 if (!IS_ERR_OR_NULL(ptr: bt_debugfs))
2703 iso_debugfs = debugfs_create_file("iso", 0444, bt_debugfs,
2704 NULL, &iso_debugfs_fops);
2705
2706 inited = true;
2707
2708 return 0;
2709
2710error:
2711 proto_unregister(prot: &iso_proto);
2712 return err;
2713}
2714
2715int iso_exit(void)
2716{
2717 if (!inited)
2718 return -EALREADY;
2719
2720 bt_procfs_cleanup(net: &init_net, name: "iso");
2721
2722 debugfs_remove(dentry: iso_debugfs);
2723 iso_debugfs = NULL;
2724
2725 hci_unregister_cb(hcb: &iso_cb);
2726
2727 bt_sock_unregister(BTPROTO_ISO);
2728
2729 proto_unregister(prot: &iso_proto);
2730
2731 inited = false;
2732
2733 return 0;
2734}
2735

source code of linux/net/bluetooth/iso.c