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};
39
40#define iso_conn_lock(c) spin_lock(&(c)->lock)
41#define iso_conn_unlock(c) spin_unlock(&(c)->lock)
42
43static void iso_sock_close(struct sock *sk);
44static void iso_sock_kill(struct sock *sk);
45
46/* ----- ISO socket info ----- */
47#define iso_pi(sk) ((struct iso_pinfo *)sk)
48
49#define EIR_SERVICE_DATA_LENGTH 4
50#define BASE_MAX_LENGTH (HCI_MAX_PER_AD_LENGTH - EIR_SERVICE_DATA_LENGTH)
51#define EIR_BAA_SERVICE_UUID 0x1851
52
53/* iso_pinfo flags values */
54enum {
55 BT_SK_BIG_SYNC,
56 BT_SK_PA_SYNC,
57 BT_SK_PA_SYNC_TERM,
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_sync_handle(struct sock *sk, void *data);
84static void iso_sock_disconn(struct sock *sk);
85
86typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);
87
88static struct sock *iso_get_sock_listen(bdaddr_t *src, bdaddr_t *dst,
89 iso_sock_match_t match, void *data);
90
91/* ---- ISO timers ---- */
92#define ISO_CONN_TIMEOUT (HZ * 40)
93#define ISO_DISCONN_TIMEOUT (HZ * 2)
94
95static void iso_sock_timeout(struct work_struct *work)
96{
97 struct iso_conn *conn = container_of(work, struct iso_conn,
98 timeout_work.work);
99 struct sock *sk;
100
101 iso_conn_lock(conn);
102 sk = conn->sk;
103 if (sk)
104 sock_hold(sk);
105 iso_conn_unlock(conn);
106
107 if (!sk)
108 return;
109
110 BT_DBG("sock %p state %d", sk, sk->sk_state);
111
112 lock_sock(sk);
113 sk->sk_err = ETIMEDOUT;
114 sk->sk_state_change(sk);
115 release_sock(sk);
116 sock_put(sk);
117}
118
119static void iso_sock_set_timer(struct sock *sk, long timeout)
120{
121 if (!iso_pi(sk)->conn)
122 return;
123
124 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
125 cancel_delayed_work(dwork: &iso_pi(sk)->conn->timeout_work);
126 schedule_delayed_work(dwork: &iso_pi(sk)->conn->timeout_work, delay: timeout);
127}
128
129static void iso_sock_clear_timer(struct sock *sk)
130{
131 if (!iso_pi(sk)->conn)
132 return;
133
134 BT_DBG("sock %p state %d", sk, sk->sk_state);
135 cancel_delayed_work(dwork: &iso_pi(sk)->conn->timeout_work);
136}
137
138/* ---- ISO connections ---- */
139static struct iso_conn *iso_conn_add(struct hci_conn *hcon)
140{
141 struct iso_conn *conn = hcon->iso_data;
142
143 if (conn) {
144 if (!conn->hcon)
145 conn->hcon = hcon;
146 return conn;
147 }
148
149 conn = kzalloc(size: sizeof(*conn), GFP_KERNEL);
150 if (!conn)
151 return NULL;
152
153 spin_lock_init(&conn->lock);
154 INIT_DELAYED_WORK(&conn->timeout_work, iso_sock_timeout);
155
156 hcon->iso_data = conn;
157 conn->hcon = hcon;
158 conn->tx_sn = 0;
159
160 BT_DBG("hcon %p conn %p", hcon, conn);
161
162 return conn;
163}
164
165/* Delete channel. Must be called on the locked socket. */
166static void iso_chan_del(struct sock *sk, int err)
167{
168 struct iso_conn *conn;
169 struct sock *parent;
170
171 conn = iso_pi(sk)->conn;
172
173 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
174
175 if (conn) {
176 iso_conn_lock(conn);
177 conn->sk = NULL;
178 iso_pi(sk)->conn = NULL;
179 iso_conn_unlock(conn);
180
181 if (conn->hcon)
182 hci_conn_drop(conn: conn->hcon);
183 }
184
185 sk->sk_state = BT_CLOSED;
186 sk->sk_err = err;
187
188 parent = bt_sk(sk)->parent;
189 if (parent) {
190 bt_accept_unlink(sk);
191 parent->sk_data_ready(parent);
192 } else {
193 sk->sk_state_change(sk);
194 }
195
196 sock_set_flag(sk, flag: SOCK_ZAPPED);
197}
198
199static bool iso_match_conn_sync_handle(struct sock *sk, void *data)
200{
201 struct hci_conn *hcon = data;
202
203 if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags))
204 return false;
205
206 return hcon->sync_handle == iso_pi(sk)->sync_handle;
207}
208
209static void iso_conn_del(struct hci_conn *hcon, int err)
210{
211 struct iso_conn *conn = hcon->iso_data;
212 struct sock *sk;
213 struct sock *parent;
214
215 if (!conn)
216 return;
217
218 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
219
220 /* Kill socket */
221 iso_conn_lock(conn);
222 sk = conn->sk;
223 if (sk)
224 sock_hold(sk);
225 iso_conn_unlock(conn);
226
227 if (sk) {
228 lock_sock(sk);
229
230 /* While a PA sync hcon is in the process of closing,
231 * mark parent socket with a flag, so that any residual
232 * BIGInfo adv reports that arrive before PA sync is
233 * terminated are not processed anymore.
234 */
235 if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) {
236 parent = iso_get_sock_listen(src: &hcon->src,
237 dst: &hcon->dst,
238 match: iso_match_conn_sync_handle,
239 data: hcon);
240
241 if (parent) {
242 set_bit(nr: BT_SK_PA_SYNC_TERM,
243 addr: &iso_pi(parent)->flags);
244 sock_put(sk: parent);
245 }
246 }
247
248 iso_sock_clear_timer(sk);
249 iso_chan_del(sk, err);
250 release_sock(sk);
251 sock_put(sk);
252 }
253
254 /* Ensure no more work items will run before freeing conn. */
255 cancel_delayed_work_sync(dwork: &conn->timeout_work);
256
257 hcon->iso_data = NULL;
258 kfree(objp: conn);
259}
260
261static int __iso_chan_add(struct iso_conn *conn, struct sock *sk,
262 struct sock *parent)
263{
264 BT_DBG("conn %p", conn);
265
266 if (iso_pi(sk)->conn == conn && conn->sk == sk)
267 return 0;
268
269 if (conn->sk) {
270 BT_ERR("conn->sk already set");
271 return -EBUSY;
272 }
273
274 iso_pi(sk)->conn = conn;
275 conn->sk = sk;
276
277 if (parent)
278 bt_accept_enqueue(parent, sk, bh: true);
279
280 return 0;
281}
282
283static int iso_chan_add(struct iso_conn *conn, struct sock *sk,
284 struct sock *parent)
285{
286 int err;
287
288 iso_conn_lock(conn);
289 err = __iso_chan_add(conn, sk, parent);
290 iso_conn_unlock(conn);
291
292 return err;
293}
294
295static inline u8 le_addr_type(u8 bdaddr_type)
296{
297 if (bdaddr_type == BDADDR_LE_PUBLIC)
298 return ADDR_LE_DEV_PUBLIC;
299 else
300 return ADDR_LE_DEV_RANDOM;
301}
302
303static int iso_connect_bis(struct sock *sk)
304{
305 struct iso_conn *conn;
306 struct hci_conn *hcon;
307 struct hci_dev *hdev;
308 int err;
309
310 BT_DBG("%pMR", &iso_pi(sk)->src);
311
312 hdev = hci_get_route(dst: &iso_pi(sk)->dst, src: &iso_pi(sk)->src,
313 iso_pi(sk)->src_type);
314 if (!hdev)
315 return -EHOSTUNREACH;
316
317 hci_dev_lock(hdev);
318
319 if (!bis_capable(hdev)) {
320 err = -EOPNOTSUPP;
321 goto unlock;
322 }
323
324 /* Fail if user set invalid QoS */
325 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(qos: &iso_pi(sk)->qos)) {
326 iso_pi(sk)->qos = default_qos;
327 err = -EINVAL;
328 goto unlock;
329 }
330
331 /* Fail if out PHYs are marked as disabled */
332 if (!iso_pi(sk)->qos.bcast.out.phy) {
333 err = -EINVAL;
334 goto unlock;
335 }
336
337 /* Just bind if DEFER_SETUP has been set */
338 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
339 hcon = hci_bind_bis(hdev, dst: &iso_pi(sk)->dst,
340 qos: &iso_pi(sk)->qos, iso_pi(sk)->base_len,
341 iso_pi(sk)->base);
342 if (IS_ERR(ptr: hcon)) {
343 err = PTR_ERR(ptr: hcon);
344 goto unlock;
345 }
346 } else {
347 hcon = hci_connect_bis(hdev, dst: &iso_pi(sk)->dst,
348 dst_type: le_addr_type(iso_pi(sk)->dst_type),
349 qos: &iso_pi(sk)->qos, iso_pi(sk)->base_len,
350 iso_pi(sk)->base);
351 if (IS_ERR(ptr: hcon)) {
352 err = PTR_ERR(ptr: hcon);
353 goto unlock;
354 }
355 }
356
357 conn = iso_conn_add(hcon);
358 if (!conn) {
359 hci_conn_drop(conn: hcon);
360 err = -ENOMEM;
361 goto unlock;
362 }
363
364 lock_sock(sk);
365
366 err = iso_chan_add(conn, sk, NULL);
367 if (err) {
368 release_sock(sk);
369 goto unlock;
370 }
371
372 /* Update source addr of the socket */
373 bacpy(dst: &iso_pi(sk)->src, src: &hcon->src);
374
375 if (hcon->state == BT_CONNECTED) {
376 iso_sock_clear_timer(sk);
377 sk->sk_state = BT_CONNECTED;
378 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
379 iso_sock_clear_timer(sk);
380 sk->sk_state = BT_CONNECT;
381 } else {
382 sk->sk_state = BT_CONNECT;
383 iso_sock_set_timer(sk, timeout: sk->sk_sndtimeo);
384 }
385
386 release_sock(sk);
387
388unlock:
389 hci_dev_unlock(hdev);
390 hci_dev_put(d: hdev);
391 return err;
392}
393
394static int iso_connect_cis(struct sock *sk)
395{
396 struct iso_conn *conn;
397 struct hci_conn *hcon;
398 struct hci_dev *hdev;
399 int err;
400
401 BT_DBG("%pMR -> %pMR", &iso_pi(sk)->src, &iso_pi(sk)->dst);
402
403 hdev = hci_get_route(dst: &iso_pi(sk)->dst, src: &iso_pi(sk)->src,
404 iso_pi(sk)->src_type);
405 if (!hdev)
406 return -EHOSTUNREACH;
407
408 hci_dev_lock(hdev);
409
410 if (!cis_central_capable(hdev)) {
411 err = -EOPNOTSUPP;
412 goto unlock;
413 }
414
415 /* Fail if user set invalid QoS */
416 if (iso_pi(sk)->qos_user_set && !check_ucast_qos(qos: &iso_pi(sk)->qos)) {
417 iso_pi(sk)->qos = default_qos;
418 err = -EINVAL;
419 goto unlock;
420 }
421
422 /* Fail if either PHYs are marked as disabled */
423 if (!iso_pi(sk)->qos.ucast.in.phy && !iso_pi(sk)->qos.ucast.out.phy) {
424 err = -EINVAL;
425 goto unlock;
426 }
427
428 /* Just bind if DEFER_SETUP has been set */
429 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
430 hcon = hci_bind_cis(hdev, dst: &iso_pi(sk)->dst,
431 dst_type: le_addr_type(iso_pi(sk)->dst_type),
432 qos: &iso_pi(sk)->qos);
433 if (IS_ERR(ptr: hcon)) {
434 err = PTR_ERR(ptr: hcon);
435 goto unlock;
436 }
437 } else {
438 hcon = hci_connect_cis(hdev, dst: &iso_pi(sk)->dst,
439 dst_type: le_addr_type(iso_pi(sk)->dst_type),
440 qos: &iso_pi(sk)->qos);
441 if (IS_ERR(ptr: hcon)) {
442 err = PTR_ERR(ptr: hcon);
443 goto unlock;
444 }
445 }
446
447 conn = iso_conn_add(hcon);
448 if (!conn) {
449 hci_conn_drop(conn: hcon);
450 err = -ENOMEM;
451 goto unlock;
452 }
453
454 lock_sock(sk);
455
456 err = iso_chan_add(conn, sk, NULL);
457 if (err) {
458 release_sock(sk);
459 goto unlock;
460 }
461
462 /* Update source addr of the socket */
463 bacpy(dst: &iso_pi(sk)->src, src: &hcon->src);
464
465 if (hcon->state == BT_CONNECTED) {
466 iso_sock_clear_timer(sk);
467 sk->sk_state = BT_CONNECTED;
468 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
469 iso_sock_clear_timer(sk);
470 sk->sk_state = BT_CONNECT;
471 } else {
472 sk->sk_state = BT_CONNECT;
473 iso_sock_set_timer(sk, timeout: sk->sk_sndtimeo);
474 }
475
476 release_sock(sk);
477
478unlock:
479 hci_dev_unlock(hdev);
480 hci_dev_put(d: hdev);
481 return err;
482}
483
484static struct bt_iso_qos *iso_sock_get_qos(struct sock *sk)
485{
486 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
487 return &iso_pi(sk)->conn->hcon->iso_qos;
488
489 return &iso_pi(sk)->qos;
490}
491
492static int iso_send_frame(struct sock *sk, struct sk_buff *skb)
493{
494 struct iso_conn *conn = iso_pi(sk)->conn;
495 struct bt_iso_qos *qos = iso_sock_get_qos(sk);
496 struct hci_iso_data_hdr *hdr;
497 int len = 0;
498
499 BT_DBG("sk %p len %d", sk, skb->len);
500
501 if (skb->len > qos->ucast.out.sdu)
502 return -EMSGSIZE;
503
504 len = skb->len;
505
506 /* Push ISO data header */
507 hdr = skb_push(skb, HCI_ISO_DATA_HDR_SIZE);
508 hdr->sn = cpu_to_le16(conn->tx_sn++);
509 hdr->slen = cpu_to_le16(hci_iso_data_len_pack(len,
510 HCI_ISO_STATUS_VALID));
511
512 if (sk->sk_state == BT_CONNECTED)
513 hci_send_iso(conn: conn->hcon, skb);
514 else
515 len = -ENOTCONN;
516
517 return len;
518}
519
520static void iso_recv_frame(struct iso_conn *conn, struct sk_buff *skb)
521{
522 struct sock *sk;
523
524 iso_conn_lock(conn);
525 sk = conn->sk;
526 iso_conn_unlock(conn);
527
528 if (!sk)
529 goto drop;
530
531 BT_DBG("sk %p len %d", sk, skb->len);
532
533 if (sk->sk_state != BT_CONNECTED)
534 goto drop;
535
536 if (!sock_queue_rcv_skb(sk, skb))
537 return;
538
539drop:
540 kfree_skb(skb);
541}
542
543/* -------- Socket interface ---------- */
544static struct sock *__iso_get_sock_listen_by_addr(bdaddr_t *src, bdaddr_t *dst)
545{
546 struct sock *sk;
547
548 sk_for_each(sk, &iso_sk_list.head) {
549 if (sk->sk_state != BT_LISTEN)
550 continue;
551
552 if (bacmp(ba1: &iso_pi(sk)->dst, ba2: dst))
553 continue;
554
555 if (!bacmp(ba1: &iso_pi(sk)->src, ba2: src))
556 return sk;
557 }
558
559 return NULL;
560}
561
562static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
563 __u8 sid)
564{
565 struct sock *sk;
566
567 sk_for_each(sk, &iso_sk_list.head) {
568 if (sk->sk_state != BT_LISTEN)
569 continue;
570
571 if (bacmp(ba1: &iso_pi(sk)->src, ba2: ba))
572 continue;
573
574 if (bacmp(ba1: &iso_pi(sk)->dst, ba2: bc))
575 continue;
576
577 if (iso_pi(sk)->bc_sid == sid)
578 return sk;
579 }
580
581 return NULL;
582}
583
584/* Find socket listening:
585 * source bdaddr (Unicast)
586 * destination bdaddr (Broadcast only)
587 * match func - pass NULL to ignore
588 * match func data - pass -1 to ignore
589 * Returns closest match.
590 */
591static struct sock *iso_get_sock_listen(bdaddr_t *src, bdaddr_t *dst,
592 iso_sock_match_t match, void *data)
593{
594 struct sock *sk = NULL, *sk1 = NULL;
595
596 read_lock(&iso_sk_list.lock);
597
598 sk_for_each(sk, &iso_sk_list.head) {
599 if (sk->sk_state != BT_LISTEN)
600 continue;
601
602 /* Match Broadcast destination */
603 if (bacmp(ba1: dst, BDADDR_ANY) && bacmp(ba1: &iso_pi(sk)->dst, ba2: dst))
604 continue;
605
606 /* Use Match function if provided */
607 if (match && !match(sk, data))
608 continue;
609
610 /* Exact match. */
611 if (!bacmp(ba1: &iso_pi(sk)->src, ba2: src)) {
612 sock_hold(sk);
613 break;
614 }
615
616 /* Closest match */
617 if (!bacmp(ba1: &iso_pi(sk)->src, BDADDR_ANY)) {
618 if (sk1)
619 sock_put(sk: sk1);
620
621 sk1 = sk;
622 sock_hold(sk: sk1);
623 }
624 }
625
626 if (sk && sk1)
627 sock_put(sk: sk1);
628
629 read_unlock(&iso_sk_list.lock);
630
631 return sk ? sk : sk1;
632}
633
634static struct sock *iso_get_sock_big(struct sock *match_sk, bdaddr_t *src,
635 bdaddr_t *dst, uint8_t big)
636{
637 struct sock *sk = NULL;
638
639 read_lock(&iso_sk_list.lock);
640
641 sk_for_each(sk, &iso_sk_list.head) {
642 if (match_sk == sk)
643 continue;
644
645 /* Look for sockets that have already been
646 * connected to the BIG
647 */
648 if (sk->sk_state != BT_CONNECTED &&
649 sk->sk_state != BT_CONNECT)
650 continue;
651
652 /* Match Broadcast destination */
653 if (bacmp(ba1: &iso_pi(sk)->dst, ba2: dst))
654 continue;
655
656 /* Match BIG handle */
657 if (iso_pi(sk)->qos.bcast.big != big)
658 continue;
659
660 /* Match source address */
661 if (bacmp(ba1: &iso_pi(sk)->src, ba2: src))
662 continue;
663
664 sock_hold(sk);
665 break;
666 }
667
668 read_unlock(&iso_sk_list.lock);
669
670 return sk;
671}
672
673static void iso_sock_destruct(struct sock *sk)
674{
675 BT_DBG("sk %p", sk);
676
677 skb_queue_purge(list: &sk->sk_receive_queue);
678 skb_queue_purge(list: &sk->sk_write_queue);
679}
680
681static void iso_sock_cleanup_listen(struct sock *parent)
682{
683 struct sock *sk;
684
685 BT_DBG("parent %p", parent);
686
687 /* Close not yet accepted channels */
688 while ((sk = bt_accept_dequeue(parent, NULL))) {
689 iso_sock_close(sk);
690 iso_sock_kill(sk);
691 }
692
693 /* If listening socket has a hcon, properly disconnect it */
694 if (iso_pi(parent)->conn && iso_pi(parent)->conn->hcon) {
695 iso_sock_disconn(sk: parent);
696 return;
697 }
698
699 parent->sk_state = BT_CLOSED;
700 sock_set_flag(sk: parent, flag: SOCK_ZAPPED);
701}
702
703/* Kill socket (only if zapped and orphan)
704 * Must be called on unlocked socket.
705 */
706static void iso_sock_kill(struct sock *sk)
707{
708 if (!sock_flag(sk, flag: SOCK_ZAPPED) || sk->sk_socket ||
709 sock_flag(sk, flag: SOCK_DEAD))
710 return;
711
712 BT_DBG("sk %p state %d", sk, sk->sk_state);
713
714 /* Kill poor orphan */
715 bt_sock_unlink(l: &iso_sk_list, s: sk);
716 sock_set_flag(sk, flag: SOCK_DEAD);
717 sock_put(sk);
718}
719
720static void iso_sock_disconn(struct sock *sk)
721{
722 struct sock *bis_sk;
723 struct hci_conn *hcon = iso_pi(sk)->conn->hcon;
724
725 if (test_bit(HCI_CONN_BIG_CREATED, &hcon->flags)) {
726 bis_sk = iso_get_sock_big(match_sk: sk, src: &iso_pi(sk)->src,
727 dst: &iso_pi(sk)->dst,
728 iso_pi(sk)->qos.bcast.big);
729
730 /* If there are any other connected sockets for the
731 * same BIG, just delete the sk and leave the bis
732 * hcon active, in case later rebinding is needed.
733 */
734 if (bis_sk) {
735 hcon->state = BT_OPEN;
736 iso_pi(sk)->conn->hcon = NULL;
737 iso_sock_clear_timer(sk);
738 iso_chan_del(sk, err: bt_to_errno(code: hcon->abort_reason));
739 sock_put(sk: bis_sk);
740 return;
741 }
742 }
743
744 sk->sk_state = BT_DISCONN;
745 iso_sock_set_timer(sk, ISO_DISCONN_TIMEOUT);
746 iso_conn_lock(iso_pi(sk)->conn);
747 hci_conn_drop(iso_pi(sk)->conn->hcon);
748 iso_pi(sk)->conn->hcon = NULL;
749 iso_conn_unlock(iso_pi(sk)->conn);
750}
751
752static void __iso_sock_close(struct sock *sk)
753{
754 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
755
756 switch (sk->sk_state) {
757 case BT_LISTEN:
758 iso_sock_cleanup_listen(parent: sk);
759 break;
760
761 case BT_CONNECT:
762 case BT_CONNECTED:
763 case BT_CONFIG:
764 if (iso_pi(sk)->conn->hcon)
765 iso_sock_disconn(sk);
766 else
767 iso_chan_del(sk, ECONNRESET);
768 break;
769
770 case BT_CONNECT2:
771 if (iso_pi(sk)->conn->hcon &&
772 (test_bit(HCI_CONN_PA_SYNC, &iso_pi(sk)->conn->hcon->flags) ||
773 test_bit(HCI_CONN_PA_SYNC_FAILED, &iso_pi(sk)->conn->hcon->flags)))
774 iso_sock_disconn(sk);
775 else
776 iso_chan_del(sk, ECONNRESET);
777 break;
778 case BT_DISCONN:
779 iso_chan_del(sk, ECONNRESET);
780 break;
781
782 default:
783 sock_set_flag(sk, flag: SOCK_ZAPPED);
784 break;
785 }
786}
787
788/* Must be called on unlocked socket. */
789static void iso_sock_close(struct sock *sk)
790{
791 iso_sock_clear_timer(sk);
792 lock_sock(sk);
793 __iso_sock_close(sk);
794 release_sock(sk);
795 iso_sock_kill(sk);
796}
797
798static void iso_sock_init(struct sock *sk, struct sock *parent)
799{
800 BT_DBG("sk %p", sk);
801
802 if (parent) {
803 sk->sk_type = parent->sk_type;
804 bt_sk(sk)->flags = bt_sk(parent)->flags;
805 security_sk_clone(sk: parent, newsk: sk);
806 }
807}
808
809static struct proto iso_proto = {
810 .name = "ISO",
811 .owner = THIS_MODULE,
812 .obj_size = sizeof(struct iso_pinfo)
813};
814
815#define DEFAULT_IO_QOS \
816{ \
817 .interval = 10000u, \
818 .latency = 10u, \
819 .sdu = 40u, \
820 .phy = BT_ISO_PHY_2M, \
821 .rtn = 2u, \
822}
823
824static struct bt_iso_qos default_qos = {
825 .bcast = {
826 .big = BT_ISO_QOS_BIG_UNSET,
827 .bis = BT_ISO_QOS_BIS_UNSET,
828 .sync_factor = 0x01,
829 .packing = 0x00,
830 .framing = 0x00,
831 .in = DEFAULT_IO_QOS,
832 .out = DEFAULT_IO_QOS,
833 .encryption = 0x00,
834 .bcode = {0x00},
835 .options = 0x00,
836 .skip = 0x0000,
837 .sync_timeout = BT_ISO_SYNC_TIMEOUT,
838 .sync_cte_type = 0x00,
839 .mse = 0x00,
840 .timeout = BT_ISO_SYNC_TIMEOUT,
841 },
842};
843
844static struct sock *iso_sock_alloc(struct net *net, struct socket *sock,
845 int proto, gfp_t prio, int kern)
846{
847 struct sock *sk;
848
849 sk = bt_sock_alloc(net, sock, prot: &iso_proto, proto, prio, kern);
850 if (!sk)
851 return NULL;
852
853 sk->sk_destruct = iso_sock_destruct;
854 sk->sk_sndtimeo = ISO_CONN_TIMEOUT;
855
856 /* Set address type as public as default src address is BDADDR_ANY */
857 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
858
859 iso_pi(sk)->qos = default_qos;
860
861 bt_sock_link(l: &iso_sk_list, s: sk);
862 return sk;
863}
864
865static int iso_sock_create(struct net *net, struct socket *sock, int protocol,
866 int kern)
867{
868 struct sock *sk;
869
870 BT_DBG("sock %p", sock);
871
872 sock->state = SS_UNCONNECTED;
873
874 if (sock->type != SOCK_SEQPACKET)
875 return -ESOCKTNOSUPPORT;
876
877 sock->ops = &iso_sock_ops;
878
879 sk = iso_sock_alloc(net, sock, proto: protocol, GFP_ATOMIC, kern);
880 if (!sk)
881 return -ENOMEM;
882
883 iso_sock_init(sk, NULL);
884 return 0;
885}
886
887static int iso_sock_bind_bc(struct socket *sock, struct sockaddr *addr,
888 int addr_len)
889{
890 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
891 struct sock *sk = sock->sk;
892 int i;
893
894 BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid,
895 sa->iso_bc->bc_num_bis);
896
897 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc))
898 return -EINVAL;
899
900 bacpy(dst: &iso_pi(sk)->dst, src: &sa->iso_bc->bc_bdaddr);
901
902 /* Check if the address type is of LE type */
903 if (!bdaddr_type_is_le(type: sa->iso_bc->bc_bdaddr_type))
904 return -EINVAL;
905
906 iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
907 iso_pi(sk)->sync_handle = -1;
908
909 if (sa->iso_bc->bc_sid > 0x0f)
910 return -EINVAL;
911
912 iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
913
914 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS)
915 return -EINVAL;
916
917 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
918
919 for (i = 0; i < iso_pi(sk)->bc_num_bis; i++)
920 if (sa->iso_bc->bc_bis[i] < 0x01 ||
921 sa->iso_bc->bc_bis[i] > 0x1f)
922 return -EINVAL;
923
924 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
925 iso_pi(sk)->bc_num_bis);
926
927 return 0;
928}
929
930static int iso_sock_bind_pa_sk(struct sock *sk, struct sockaddr_iso *sa,
931 int addr_len)
932{
933 int err = 0;
934
935 if (sk->sk_type != SOCK_SEQPACKET) {
936 err = -EINVAL;
937 goto done;
938 }
939
940 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc)) {
941 err = -EINVAL;
942 goto done;
943 }
944
945 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS) {
946 err = -EINVAL;
947 goto done;
948 }
949
950 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
951
952 for (int i = 0; i < iso_pi(sk)->bc_num_bis; i++)
953 if (sa->iso_bc->bc_bis[i] < 0x01 ||
954 sa->iso_bc->bc_bis[i] > 0x1f) {
955 err = -EINVAL;
956 goto done;
957 }
958
959 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
960 iso_pi(sk)->bc_num_bis);
961
962done:
963 return err;
964}
965
966static int iso_sock_bind(struct socket *sock, struct sockaddr *addr,
967 int addr_len)
968{
969 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
970 struct sock *sk = sock->sk;
971 int err = 0;
972
973 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type);
974
975 if (!addr || addr_len < sizeof(struct sockaddr_iso) ||
976 addr->sa_family != AF_BLUETOOTH)
977 return -EINVAL;
978
979 lock_sock(sk);
980
981 /* Allow the user to bind a PA sync socket to a number
982 * of BISes to sync to.
983 */
984 if (sk->sk_state == BT_CONNECT2 &&
985 test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) {
986 err = iso_sock_bind_pa_sk(sk, sa, addr_len);
987 goto done;
988 }
989
990 if (sk->sk_state != BT_OPEN) {
991 err = -EBADFD;
992 goto done;
993 }
994
995 if (sk->sk_type != SOCK_SEQPACKET) {
996 err = -EINVAL;
997 goto done;
998 }
999
1000 /* Check if the address type is of LE type */
1001 if (!bdaddr_type_is_le(type: sa->iso_bdaddr_type)) {
1002 err = -EINVAL;
1003 goto done;
1004 }
1005
1006 bacpy(dst: &iso_pi(sk)->src, src: &sa->iso_bdaddr);
1007 iso_pi(sk)->src_type = sa->iso_bdaddr_type;
1008
1009 /* Check for Broadcast address */
1010 if (addr_len > sizeof(*sa)) {
1011 err = iso_sock_bind_bc(sock, addr, addr_len);
1012 if (err)
1013 goto done;
1014 }
1015
1016 sk->sk_state = BT_BOUND;
1017
1018done:
1019 release_sock(sk);
1020 return err;
1021}
1022
1023static int iso_sock_connect(struct socket *sock, struct sockaddr *addr,
1024 int alen, int flags)
1025{
1026 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1027 struct sock *sk = sock->sk;
1028 int err;
1029
1030 BT_DBG("sk %p", sk);
1031
1032 if (alen < sizeof(struct sockaddr_iso) ||
1033 addr->sa_family != AF_BLUETOOTH)
1034 return -EINVAL;
1035
1036 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
1037 return -EBADFD;
1038
1039 if (sk->sk_type != SOCK_SEQPACKET)
1040 return -EINVAL;
1041
1042 /* Check if the address type is of LE type */
1043 if (!bdaddr_type_is_le(type: sa->iso_bdaddr_type))
1044 return -EINVAL;
1045
1046 lock_sock(sk);
1047
1048 bacpy(dst: &iso_pi(sk)->dst, src: &sa->iso_bdaddr);
1049 iso_pi(sk)->dst_type = sa->iso_bdaddr_type;
1050
1051 release_sock(sk);
1052
1053 if (bacmp(ba1: &iso_pi(sk)->dst, BDADDR_ANY))
1054 err = iso_connect_cis(sk);
1055 else
1056 err = iso_connect_bis(sk);
1057
1058 if (err)
1059 return err;
1060
1061 lock_sock(sk);
1062
1063 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1064 err = bt_sock_wait_state(sk, state: BT_CONNECTED,
1065 timeo: sock_sndtimeo(sk, noblock: flags & O_NONBLOCK));
1066 }
1067
1068 release_sock(sk);
1069 return err;
1070}
1071
1072static int iso_listen_bis(struct sock *sk)
1073{
1074 struct hci_dev *hdev;
1075 int err = 0;
1076 struct iso_conn *conn;
1077 struct hci_conn *hcon;
1078
1079 BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &iso_pi(sk)->src,
1080 &iso_pi(sk)->dst, iso_pi(sk)->bc_sid);
1081
1082 write_lock(&iso_sk_list.lock);
1083
1084 if (__iso_get_sock_listen_by_sid(ba: &iso_pi(sk)->src, bc: &iso_pi(sk)->dst,
1085 iso_pi(sk)->bc_sid))
1086 err = -EADDRINUSE;
1087
1088 write_unlock(&iso_sk_list.lock);
1089
1090 if (err)
1091 return err;
1092
1093 hdev = hci_get_route(dst: &iso_pi(sk)->dst, src: &iso_pi(sk)->src,
1094 iso_pi(sk)->src_type);
1095 if (!hdev)
1096 return -EHOSTUNREACH;
1097
1098 hci_dev_lock(hdev);
1099
1100 /* Fail if user set invalid QoS */
1101 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(qos: &iso_pi(sk)->qos)) {
1102 iso_pi(sk)->qos = default_qos;
1103 err = -EINVAL;
1104 goto unlock;
1105 }
1106
1107 hcon = hci_pa_create_sync(hdev, dst: &iso_pi(sk)->dst,
1108 dst_type: le_addr_type(iso_pi(sk)->dst_type),
1109 iso_pi(sk)->bc_sid, qos: &iso_pi(sk)->qos);
1110 if (IS_ERR(ptr: hcon)) {
1111 err = PTR_ERR(ptr: hcon);
1112 goto unlock;
1113 }
1114
1115 conn = iso_conn_add(hcon);
1116 if (!conn) {
1117 hci_conn_drop(conn: hcon);
1118 err = -ENOMEM;
1119 goto unlock;
1120 }
1121
1122 err = iso_chan_add(conn, sk, NULL);
1123 if (err) {
1124 hci_conn_drop(conn: hcon);
1125 goto unlock;
1126 }
1127
1128 hci_dev_put(d: hdev);
1129
1130unlock:
1131 hci_dev_unlock(hdev);
1132 return err;
1133}
1134
1135static int iso_listen_cis(struct sock *sk)
1136{
1137 int err = 0;
1138
1139 BT_DBG("%pMR", &iso_pi(sk)->src);
1140
1141 write_lock(&iso_sk_list.lock);
1142
1143 if (__iso_get_sock_listen_by_addr(src: &iso_pi(sk)->src, dst: &iso_pi(sk)->dst))
1144 err = -EADDRINUSE;
1145
1146 write_unlock(&iso_sk_list.lock);
1147
1148 return err;
1149}
1150
1151static int iso_sock_listen(struct socket *sock, int backlog)
1152{
1153 struct sock *sk = sock->sk;
1154 int err = 0;
1155
1156 BT_DBG("sk %p backlog %d", sk, backlog);
1157
1158 lock_sock(sk);
1159
1160 if (sk->sk_state != BT_BOUND) {
1161 err = -EBADFD;
1162 goto done;
1163 }
1164
1165 if (sk->sk_type != SOCK_SEQPACKET) {
1166 err = -EINVAL;
1167 goto done;
1168 }
1169
1170 if (!bacmp(ba1: &iso_pi(sk)->dst, BDADDR_ANY))
1171 err = iso_listen_cis(sk);
1172 else
1173 err = iso_listen_bis(sk);
1174
1175 if (err)
1176 goto done;
1177
1178 sk->sk_max_ack_backlog = backlog;
1179 sk->sk_ack_backlog = 0;
1180
1181 sk->sk_state = BT_LISTEN;
1182
1183done:
1184 release_sock(sk);
1185 return err;
1186}
1187
1188static int iso_sock_accept(struct socket *sock, struct socket *newsock,
1189 int flags, bool kern)
1190{
1191 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1192 struct sock *sk = sock->sk, *ch;
1193 long timeo;
1194 int err = 0;
1195
1196 lock_sock(sk);
1197
1198 timeo = sock_rcvtimeo(sk, noblock: flags & O_NONBLOCK);
1199
1200 BT_DBG("sk %p timeo %ld", sk, timeo);
1201
1202 /* Wait for an incoming connection. (wake-one). */
1203 add_wait_queue_exclusive(wq_head: sk_sleep(sk), wq_entry: &wait);
1204 while (1) {
1205 if (sk->sk_state != BT_LISTEN) {
1206 err = -EBADFD;
1207 break;
1208 }
1209
1210 ch = bt_accept_dequeue(parent: sk, newsock);
1211 if (ch)
1212 break;
1213
1214 if (!timeo) {
1215 err = -EAGAIN;
1216 break;
1217 }
1218
1219 if (signal_pending(current)) {
1220 err = sock_intr_errno(timeo);
1221 break;
1222 }
1223
1224 release_sock(sk);
1225
1226 timeo = wait_woken(wq_entry: &wait, TASK_INTERRUPTIBLE, timeout: timeo);
1227 lock_sock(sk);
1228 }
1229 remove_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait);
1230
1231 if (err)
1232 goto done;
1233
1234 newsock->state = SS_CONNECTED;
1235
1236 BT_DBG("new socket %p", ch);
1237
1238done:
1239 release_sock(sk);
1240 return err;
1241}
1242
1243static int iso_sock_getname(struct socket *sock, struct sockaddr *addr,
1244 int peer)
1245{
1246 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1247 struct sock *sk = sock->sk;
1248
1249 BT_DBG("sock %p, sk %p", sock, sk);
1250
1251 addr->sa_family = AF_BLUETOOTH;
1252
1253 if (peer) {
1254 bacpy(dst: &sa->iso_bdaddr, src: &iso_pi(sk)->dst);
1255 sa->iso_bdaddr_type = iso_pi(sk)->dst_type;
1256 } else {
1257 bacpy(dst: &sa->iso_bdaddr, src: &iso_pi(sk)->src);
1258 sa->iso_bdaddr_type = iso_pi(sk)->src_type;
1259 }
1260
1261 return sizeof(struct sockaddr_iso);
1262}
1263
1264static int iso_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1265 size_t len)
1266{
1267 struct sock *sk = sock->sk;
1268 struct sk_buff *skb, **frag;
1269 size_t mtu;
1270 int err;
1271
1272 BT_DBG("sock %p, sk %p", sock, sk);
1273
1274 err = sock_error(sk);
1275 if (err)
1276 return err;
1277
1278 if (msg->msg_flags & MSG_OOB)
1279 return -EOPNOTSUPP;
1280
1281 lock_sock(sk);
1282
1283 if (sk->sk_state != BT_CONNECTED) {
1284 release_sock(sk);
1285 return -ENOTCONN;
1286 }
1287
1288 mtu = iso_pi(sk)->conn->hcon->hdev->iso_mtu;
1289
1290 release_sock(sk);
1291
1292 skb = bt_skb_sendmsg(sk, msg, len, mtu, HCI_ISO_DATA_HDR_SIZE, tailroom: 0);
1293 if (IS_ERR(ptr: skb))
1294 return PTR_ERR(ptr: skb);
1295
1296 len -= skb->len;
1297
1298 BT_DBG("skb %p len %d", sk, skb->len);
1299
1300 /* Continuation fragments */
1301 frag = &skb_shinfo(skb)->frag_list;
1302 while (len) {
1303 struct sk_buff *tmp;
1304
1305 tmp = bt_skb_sendmsg(sk, msg, len, mtu, headroom: 0, tailroom: 0);
1306 if (IS_ERR(ptr: tmp)) {
1307 kfree_skb(skb);
1308 return PTR_ERR(ptr: tmp);
1309 }
1310
1311 *frag = tmp;
1312
1313 len -= tmp->len;
1314
1315 skb->len += tmp->len;
1316 skb->data_len += tmp->len;
1317
1318 BT_DBG("frag %p len %d", *frag, tmp->len);
1319
1320 frag = &(*frag)->next;
1321 }
1322
1323 lock_sock(sk);
1324
1325 if (sk->sk_state == BT_CONNECTED)
1326 err = iso_send_frame(sk, skb);
1327 else
1328 err = -ENOTCONN;
1329
1330 release_sock(sk);
1331
1332 if (err < 0)
1333 kfree_skb(skb);
1334 return err;
1335}
1336
1337static void iso_conn_defer_accept(struct hci_conn *conn)
1338{
1339 struct hci_cp_le_accept_cis cp;
1340 struct hci_dev *hdev = conn->hdev;
1341
1342 BT_DBG("conn %p", conn);
1343
1344 conn->state = BT_CONFIG;
1345
1346 cp.handle = cpu_to_le16(conn->handle);
1347
1348 hci_send_cmd(hdev, HCI_OP_LE_ACCEPT_CIS, plen: sizeof(cp), param: &cp);
1349}
1350
1351static void iso_conn_big_sync(struct sock *sk)
1352{
1353 int err;
1354 struct hci_dev *hdev;
1355
1356 hdev = hci_get_route(dst: &iso_pi(sk)->dst, src: &iso_pi(sk)->src,
1357 iso_pi(sk)->src_type);
1358
1359 if (!hdev)
1360 return;
1361
1362 if (!test_and_set_bit(nr: BT_SK_BIG_SYNC, addr: &iso_pi(sk)->flags)) {
1363 err = hci_le_big_create_sync(hdev, iso_pi(sk)->conn->hcon,
1364 qos: &iso_pi(sk)->qos,
1365 iso_pi(sk)->sync_handle,
1366 iso_pi(sk)->bc_num_bis,
1367 iso_pi(sk)->bc_bis);
1368 if (err)
1369 bt_dev_err(hdev, "hci_le_big_create_sync: %d",
1370 err);
1371 }
1372}
1373
1374static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1375 size_t len, int flags)
1376{
1377 struct sock *sk = sock->sk;
1378 struct iso_pinfo *pi = iso_pi(sk);
1379
1380 BT_DBG("sk %p", sk);
1381
1382 if (test_and_clear_bit(nr: BT_SK_DEFER_SETUP, addr: &bt_sk(sk)->flags)) {
1383 lock_sock(sk);
1384 switch (sk->sk_state) {
1385 case BT_CONNECT2:
1386 if (pi->conn->hcon &&
1387 test_bit(HCI_CONN_PA_SYNC, &pi->conn->hcon->flags)) {
1388 iso_conn_big_sync(sk);
1389 sk->sk_state = BT_LISTEN;
1390 } else {
1391 iso_conn_defer_accept(conn: pi->conn->hcon);
1392 sk->sk_state = BT_CONFIG;
1393 }
1394 release_sock(sk);
1395 return 0;
1396 case BT_CONNECT:
1397 release_sock(sk);
1398 return iso_connect_cis(sk);
1399 default:
1400 release_sock(sk);
1401 break;
1402 }
1403 }
1404
1405 return bt_sock_recvmsg(sock, msg, len, flags);
1406}
1407
1408static bool check_io_qos(struct bt_iso_io_qos *qos)
1409{
1410 /* If no PHY is enable SDU must be 0 */
1411 if (!qos->phy && qos->sdu)
1412 return false;
1413
1414 if (qos->interval && (qos->interval < 0xff || qos->interval > 0xfffff))
1415 return false;
1416
1417 if (qos->latency && (qos->latency < 0x05 || qos->latency > 0xfa0))
1418 return false;
1419
1420 if (qos->phy > BT_ISO_PHY_ANY)
1421 return false;
1422
1423 return true;
1424}
1425
1426static bool check_ucast_qos(struct bt_iso_qos *qos)
1427{
1428 if (qos->ucast.cig > 0xef && qos->ucast.cig != BT_ISO_QOS_CIG_UNSET)
1429 return false;
1430
1431 if (qos->ucast.cis > 0xef && qos->ucast.cis != BT_ISO_QOS_CIS_UNSET)
1432 return false;
1433
1434 if (qos->ucast.sca > 0x07)
1435 return false;
1436
1437 if (qos->ucast.packing > 0x01)
1438 return false;
1439
1440 if (qos->ucast.framing > 0x01)
1441 return false;
1442
1443 if (!check_io_qos(qos: &qos->ucast.in))
1444 return false;
1445
1446 if (!check_io_qos(qos: &qos->ucast.out))
1447 return false;
1448
1449 return true;
1450}
1451
1452static bool check_bcast_qos(struct bt_iso_qos *qos)
1453{
1454 if (!qos->bcast.sync_factor)
1455 qos->bcast.sync_factor = 0x01;
1456
1457 if (qos->bcast.packing > 0x01)
1458 return false;
1459
1460 if (qos->bcast.framing > 0x01)
1461 return false;
1462
1463 if (!check_io_qos(qos: &qos->bcast.in))
1464 return false;
1465
1466 if (!check_io_qos(qos: &qos->bcast.out))
1467 return false;
1468
1469 if (qos->bcast.encryption > 0x01)
1470 return false;
1471
1472 if (qos->bcast.options > 0x07)
1473 return false;
1474
1475 if (qos->bcast.skip > 0x01f3)
1476 return false;
1477
1478 if (!qos->bcast.sync_timeout)
1479 qos->bcast.sync_timeout = BT_ISO_SYNC_TIMEOUT;
1480
1481 if (qos->bcast.sync_timeout < 0x000a || qos->bcast.sync_timeout > 0x4000)
1482 return false;
1483
1484 if (qos->bcast.sync_cte_type > 0x1f)
1485 return false;
1486
1487 if (qos->bcast.mse > 0x1f)
1488 return false;
1489
1490 if (!qos->bcast.timeout)
1491 qos->bcast.sync_timeout = BT_ISO_SYNC_TIMEOUT;
1492
1493 if (qos->bcast.timeout < 0x000a || qos->bcast.timeout > 0x4000)
1494 return false;
1495
1496 return true;
1497}
1498
1499static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
1500 sockptr_t optval, unsigned int optlen)
1501{
1502 struct sock *sk = sock->sk;
1503 int err = 0;
1504 struct bt_iso_qos qos = default_qos;
1505 u32 opt;
1506
1507 BT_DBG("sk %p", sk);
1508
1509 lock_sock(sk);
1510
1511 switch (optname) {
1512 case BT_DEFER_SETUP:
1513 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1514 err = -EINVAL;
1515 break;
1516 }
1517
1518 err = bt_copy_from_sockptr(dst: &opt, dst_size: sizeof(opt), src: optval, src_size: optlen);
1519 if (err)
1520 break;
1521
1522 if (opt)
1523 set_bit(nr: BT_SK_DEFER_SETUP, addr: &bt_sk(sk)->flags);
1524 else
1525 clear_bit(nr: BT_SK_DEFER_SETUP, addr: &bt_sk(sk)->flags);
1526 break;
1527
1528 case BT_PKT_STATUS:
1529 err = bt_copy_from_sockptr(dst: &opt, dst_size: sizeof(opt), src: optval, src_size: optlen);
1530 if (err)
1531 break;
1532
1533 if (opt)
1534 set_bit(nr: BT_SK_PKT_STATUS, addr: &bt_sk(sk)->flags);
1535 else
1536 clear_bit(nr: BT_SK_PKT_STATUS, addr: &bt_sk(sk)->flags);
1537 break;
1538
1539 case BT_ISO_QOS:
1540 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1541 sk->sk_state != BT_CONNECT2) {
1542 err = -EINVAL;
1543 break;
1544 }
1545
1546 err = bt_copy_from_sockptr(dst: &qos, dst_size: sizeof(qos), src: optval, src_size: optlen);
1547 if (err)
1548 break;
1549
1550 iso_pi(sk)->qos = qos;
1551 iso_pi(sk)->qos_user_set = true;
1552
1553 break;
1554
1555 case BT_ISO_BASE:
1556 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1557 sk->sk_state != BT_CONNECT2) {
1558 err = -EINVAL;
1559 break;
1560 }
1561
1562 if (optlen > sizeof(iso_pi(sk)->base)) {
1563 err = -EINVAL;
1564 break;
1565 }
1566
1567 err = bt_copy_from_sockptr(iso_pi(sk)->base, dst_size: optlen, src: optval,
1568 src_size: optlen);
1569 if (err)
1570 break;
1571
1572 iso_pi(sk)->base_len = optlen;
1573
1574 break;
1575
1576 default:
1577 err = -ENOPROTOOPT;
1578 break;
1579 }
1580
1581 release_sock(sk);
1582 return err;
1583}
1584
1585static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
1586 char __user *optval, int __user *optlen)
1587{
1588 struct sock *sk = sock->sk;
1589 int len, err = 0;
1590 struct bt_iso_qos *qos;
1591 u8 base_len;
1592 u8 *base;
1593
1594 BT_DBG("sk %p", sk);
1595
1596 if (get_user(len, optlen))
1597 return -EFAULT;
1598
1599 lock_sock(sk);
1600
1601 switch (optname) {
1602 case BT_DEFER_SETUP:
1603 if (sk->sk_state == BT_CONNECTED) {
1604 err = -EINVAL;
1605 break;
1606 }
1607
1608 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
1609 (u32 __user *)optval))
1610 err = -EFAULT;
1611
1612 break;
1613
1614 case BT_PKT_STATUS:
1615 if (put_user(test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags),
1616 (int __user *)optval))
1617 err = -EFAULT;
1618 break;
1619
1620 case BT_ISO_QOS:
1621 qos = iso_sock_get_qos(sk);
1622
1623 len = min_t(unsigned int, len, sizeof(*qos));
1624 if (copy_to_user(to: optval, from: qos, n: len))
1625 err = -EFAULT;
1626
1627 break;
1628
1629 case BT_ISO_BASE:
1630 if (sk->sk_state == BT_CONNECTED &&
1631 !bacmp(ba1: &iso_pi(sk)->dst, BDADDR_ANY)) {
1632 base_len = iso_pi(sk)->conn->hcon->le_per_adv_data_len;
1633 base = iso_pi(sk)->conn->hcon->le_per_adv_data;
1634 } else {
1635 base_len = iso_pi(sk)->base_len;
1636 base = iso_pi(sk)->base;
1637 }
1638
1639 len = min_t(unsigned int, len, base_len);
1640 if (copy_to_user(to: optval, from: base, n: len))
1641 err = -EFAULT;
1642 if (put_user(len, optlen))
1643 err = -EFAULT;
1644
1645 break;
1646
1647 default:
1648 err = -ENOPROTOOPT;
1649 break;
1650 }
1651
1652 release_sock(sk);
1653 return err;
1654}
1655
1656static int iso_sock_shutdown(struct socket *sock, int how)
1657{
1658 struct sock *sk = sock->sk;
1659 int err = 0;
1660
1661 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1662
1663 if (!sk)
1664 return 0;
1665
1666 sock_hold(sk);
1667 lock_sock(sk);
1668
1669 switch (how) {
1670 case SHUT_RD:
1671 if (sk->sk_shutdown & RCV_SHUTDOWN)
1672 goto unlock;
1673 sk->sk_shutdown |= RCV_SHUTDOWN;
1674 break;
1675 case SHUT_WR:
1676 if (sk->sk_shutdown & SEND_SHUTDOWN)
1677 goto unlock;
1678 sk->sk_shutdown |= SEND_SHUTDOWN;
1679 break;
1680 case SHUT_RDWR:
1681 if (sk->sk_shutdown & SHUTDOWN_MASK)
1682 goto unlock;
1683 sk->sk_shutdown |= SHUTDOWN_MASK;
1684 break;
1685 }
1686
1687 iso_sock_clear_timer(sk);
1688 __iso_sock_close(sk);
1689
1690 if (sock_flag(sk, flag: SOCK_LINGER) && sk->sk_lingertime &&
1691 !(current->flags & PF_EXITING))
1692 err = bt_sock_wait_state(sk, state: BT_CLOSED, timeo: sk->sk_lingertime);
1693
1694unlock:
1695 release_sock(sk);
1696 sock_put(sk);
1697
1698 return err;
1699}
1700
1701static int iso_sock_release(struct socket *sock)
1702{
1703 struct sock *sk = sock->sk;
1704 int err = 0;
1705
1706 BT_DBG("sock %p, sk %p", sock, sk);
1707
1708 if (!sk)
1709 return 0;
1710
1711 iso_sock_close(sk);
1712
1713 if (sock_flag(sk, flag: SOCK_LINGER) && READ_ONCE(sk->sk_lingertime) &&
1714 !(current->flags & PF_EXITING)) {
1715 lock_sock(sk);
1716 err = bt_sock_wait_state(sk, state: BT_CLOSED, timeo: sk->sk_lingertime);
1717 release_sock(sk);
1718 }
1719
1720 sock_orphan(sk);
1721 iso_sock_kill(sk);
1722 return err;
1723}
1724
1725static void iso_sock_ready(struct sock *sk)
1726{
1727 BT_DBG("sk %p", sk);
1728
1729 if (!sk)
1730 return;
1731
1732 lock_sock(sk);
1733 iso_sock_clear_timer(sk);
1734 sk->sk_state = BT_CONNECTED;
1735 sk->sk_state_change(sk);
1736 release_sock(sk);
1737}
1738
1739struct iso_list_data {
1740 struct hci_conn *hcon;
1741 int count;
1742};
1743
1744static bool iso_match_big(struct sock *sk, void *data)
1745{
1746 struct hci_evt_le_big_sync_estabilished *ev = data;
1747
1748 return ev->handle == iso_pi(sk)->qos.bcast.big;
1749}
1750
1751static bool iso_match_pa_sync_flag(struct sock *sk, void *data)
1752{
1753 return test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags);
1754}
1755
1756static void iso_conn_ready(struct iso_conn *conn)
1757{
1758 struct sock *parent = NULL;
1759 struct sock *sk = conn->sk;
1760 struct hci_ev_le_big_sync_estabilished *ev = NULL;
1761 struct hci_ev_le_pa_sync_established *ev2 = NULL;
1762 struct hci_evt_le_big_info_adv_report *ev3 = NULL;
1763 struct hci_conn *hcon;
1764
1765 BT_DBG("conn %p", conn);
1766
1767 if (sk) {
1768 iso_sock_ready(sk: conn->sk);
1769 } else {
1770 hcon = conn->hcon;
1771 if (!hcon)
1772 return;
1773
1774 if (test_bit(HCI_CONN_BIG_SYNC, &hcon->flags) ||
1775 test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags)) {
1776 ev = hci_recv_event_data(hdev: hcon->hdev,
1777 HCI_EVT_LE_BIG_SYNC_ESTABILISHED);
1778
1779 /* Get reference to PA sync parent socket, if it exists */
1780 parent = iso_get_sock_listen(src: &hcon->src,
1781 dst: &hcon->dst,
1782 match: iso_match_pa_sync_flag, NULL);
1783 if (!parent && ev)
1784 parent = iso_get_sock_listen(src: &hcon->src,
1785 dst: &hcon->dst,
1786 match: iso_match_big, data: ev);
1787 } else if (test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
1788 ev2 = hci_recv_event_data(hdev: hcon->hdev,
1789 HCI_EV_LE_PA_SYNC_ESTABLISHED);
1790 if (ev2)
1791 parent = iso_get_sock_listen(src: &hcon->src,
1792 dst: &hcon->dst,
1793 match: iso_match_sid, data: ev2);
1794 } else if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) {
1795 ev3 = hci_recv_event_data(hdev: hcon->hdev,
1796 HCI_EVT_LE_BIG_INFO_ADV_REPORT);
1797 if (ev3)
1798 parent = iso_get_sock_listen(src: &hcon->src,
1799 dst: &hcon->dst,
1800 match: iso_match_sync_handle, data: ev3);
1801 }
1802
1803 if (!parent)
1804 parent = iso_get_sock_listen(src: &hcon->src,
1805 BDADDR_ANY, NULL, NULL);
1806
1807 if (!parent)
1808 return;
1809
1810 lock_sock(sk: parent);
1811
1812 sk = iso_sock_alloc(net: sock_net(sk: parent), NULL,
1813 BTPROTO_ISO, GFP_ATOMIC, kern: 0);
1814 if (!sk) {
1815 release_sock(sk: parent);
1816 return;
1817 }
1818
1819 iso_sock_init(sk, parent);
1820
1821 bacpy(dst: &iso_pi(sk)->src, src: &hcon->src);
1822
1823 /* Convert from HCI to three-value type */
1824 if (hcon->src_type == ADDR_LE_DEV_PUBLIC)
1825 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
1826 else
1827 iso_pi(sk)->src_type = BDADDR_LE_RANDOM;
1828
1829 /* If hcon has no destination address (BDADDR_ANY) it means it
1830 * was created by HCI_EV_LE_BIG_SYNC_ESTABILISHED or
1831 * HCI_EV_LE_PA_SYNC_ESTABLISHED so we need to initialize using
1832 * the parent socket destination address.
1833 */
1834 if (!bacmp(ba1: &hcon->dst, BDADDR_ANY)) {
1835 bacpy(dst: &hcon->dst, src: &iso_pi(parent)->dst);
1836 hcon->dst_type = iso_pi(parent)->dst_type;
1837 hcon->sync_handle = iso_pi(parent)->sync_handle;
1838 }
1839
1840 if (ev3) {
1841 iso_pi(sk)->qos = iso_pi(parent)->qos;
1842 iso_pi(sk)->qos.bcast.encryption = ev3->encryption;
1843 hcon->iso_qos = iso_pi(sk)->qos;
1844 iso_pi(sk)->bc_num_bis = iso_pi(parent)->bc_num_bis;
1845 memcpy(iso_pi(sk)->bc_bis, iso_pi(parent)->bc_bis, ISO_MAX_NUM_BIS);
1846 set_bit(nr: BT_SK_PA_SYNC, addr: &iso_pi(sk)->flags);
1847 }
1848
1849 bacpy(dst: &iso_pi(sk)->dst, src: &hcon->dst);
1850 iso_pi(sk)->dst_type = hcon->dst_type;
1851 iso_pi(sk)->sync_handle = iso_pi(parent)->sync_handle;
1852 memcpy(iso_pi(sk)->base, iso_pi(parent)->base, iso_pi(parent)->base_len);
1853 iso_pi(sk)->base_len = iso_pi(parent)->base_len;
1854
1855 hci_conn_hold(conn: hcon);
1856 iso_chan_add(conn, sk, parent);
1857
1858 if ((ev && ((struct hci_evt_le_big_sync_estabilished *)ev)->status) ||
1859 (ev2 && ev2->status)) {
1860 /* Trigger error signal on child socket */
1861 sk->sk_err = ECONNREFUSED;
1862 sk->sk_error_report(sk);
1863 }
1864
1865 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1866 sk->sk_state = BT_CONNECT2;
1867 else
1868 sk->sk_state = BT_CONNECTED;
1869
1870 /* Wake up parent */
1871 parent->sk_data_ready(parent);
1872
1873 release_sock(sk: parent);
1874 sock_put(sk: parent);
1875 }
1876}
1877
1878static bool iso_match_sid(struct sock *sk, void *data)
1879{
1880 struct hci_ev_le_pa_sync_established *ev = data;
1881
1882 return ev->sid == iso_pi(sk)->bc_sid;
1883}
1884
1885static bool iso_match_sync_handle(struct sock *sk, void *data)
1886{
1887 struct hci_evt_le_big_info_adv_report *ev = data;
1888
1889 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
1890}
1891
1892static bool iso_match_sync_handle_pa_report(struct sock *sk, void *data)
1893{
1894 struct hci_ev_le_per_adv_report *ev = data;
1895
1896 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
1897}
1898
1899/* ----- ISO interface with lower layer (HCI) ----- */
1900
1901int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1902{
1903 struct hci_ev_le_pa_sync_established *ev1;
1904 struct hci_evt_le_big_info_adv_report *ev2;
1905 struct hci_ev_le_per_adv_report *ev3;
1906 struct sock *sk;
1907
1908 bt_dev_dbg(hdev, "bdaddr %pMR", bdaddr);
1909
1910 /* Broadcast receiver requires handling of some events before it can
1911 * proceed to establishing a BIG sync:
1912 *
1913 * 1. HCI_EV_LE_PA_SYNC_ESTABLISHED: The socket may specify a specific
1914 * SID to listen to and once sync is estabilished its handle needs to
1915 * be stored in iso_pi(sk)->sync_handle so it can be matched once
1916 * receiving the BIG Info.
1917 * 2. HCI_EVT_LE_BIG_INFO_ADV_REPORT: When connect_ind is triggered by a
1918 * a BIG Info it attempts to check if there any listening socket with
1919 * the same sync_handle and if it does then attempt to create a sync.
1920 * 3. HCI_EV_LE_PER_ADV_REPORT: When a PA report is received, it is stored
1921 * in iso_pi(sk)->base so it can be passed up to user, in the case of a
1922 * broadcast sink.
1923 */
1924 ev1 = hci_recv_event_data(hdev, HCI_EV_LE_PA_SYNC_ESTABLISHED);
1925 if (ev1) {
1926 sk = iso_get_sock_listen(src: &hdev->bdaddr, dst: bdaddr, match: iso_match_sid,
1927 data: ev1);
1928 if (sk && !ev1->status)
1929 iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);
1930
1931 goto done;
1932 }
1933
1934 ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT);
1935 if (ev2) {
1936 /* Try to get PA sync listening socket, if it exists */
1937 sk = iso_get_sock_listen(src: &hdev->bdaddr, dst: bdaddr,
1938 match: iso_match_pa_sync_flag, NULL);
1939
1940 if (!sk) {
1941 sk = iso_get_sock_listen(src: &hdev->bdaddr, dst: bdaddr,
1942 match: iso_match_sync_handle, data: ev2);
1943
1944 /* If PA Sync is in process of terminating,
1945 * do not handle any more BIGInfo adv reports.
1946 */
1947
1948 if (sk && test_bit(BT_SK_PA_SYNC_TERM,
1949 &iso_pi(sk)->flags))
1950 return 0;
1951 }
1952
1953 if (sk) {
1954 int err;
1955
1956 if (ev2->num_bis < iso_pi(sk)->bc_num_bis)
1957 iso_pi(sk)->bc_num_bis = ev2->num_bis;
1958
1959 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags) &&
1960 !test_and_set_bit(nr: BT_SK_BIG_SYNC, addr: &iso_pi(sk)->flags)) {
1961 err = hci_le_big_create_sync(hdev, NULL,
1962 qos: &iso_pi(sk)->qos,
1963 iso_pi(sk)->sync_handle,
1964 iso_pi(sk)->bc_num_bis,
1965 iso_pi(sk)->bc_bis);
1966 if (err) {
1967 bt_dev_err(hdev, "hci_le_big_create_sync: %d",
1968 err);
1969 sock_put(sk);
1970 sk = NULL;
1971 }
1972 }
1973 }
1974 }
1975
1976 ev3 = hci_recv_event_data(hdev, HCI_EV_LE_PER_ADV_REPORT);
1977 if (ev3) {
1978 size_t base_len = 0;
1979 u8 *base;
1980 struct hci_conn *hcon;
1981
1982 sk = iso_get_sock_listen(src: &hdev->bdaddr, dst: bdaddr,
1983 match: iso_match_sync_handle_pa_report, data: ev3);
1984 if (!sk)
1985 goto done;
1986
1987 hcon = iso_pi(sk)->conn->hcon;
1988 if (!hcon)
1989 goto done;
1990
1991 if (ev3->data_status == LE_PA_DATA_TRUNCATED) {
1992 /* The controller was unable to retrieve PA data. */
1993 memset(hcon->le_per_adv_data, 0,
1994 HCI_MAX_PER_AD_TOT_LEN);
1995 hcon->le_per_adv_data_len = 0;
1996 hcon->le_per_adv_data_offset = 0;
1997 goto done;
1998 }
1999
2000 if (hcon->le_per_adv_data_offset + ev3->length >
2001 HCI_MAX_PER_AD_TOT_LEN)
2002 goto done;
2003
2004 memcpy(hcon->le_per_adv_data + hcon->le_per_adv_data_offset,
2005 ev3->data, ev3->length);
2006 hcon->le_per_adv_data_offset += ev3->length;
2007
2008 if (ev3->data_status == LE_PA_DATA_COMPLETE) {
2009 /* All PA data has been received. */
2010 hcon->le_per_adv_data_len =
2011 hcon->le_per_adv_data_offset;
2012 hcon->le_per_adv_data_offset = 0;
2013
2014 /* Extract BASE */
2015 base = eir_get_service_data(eir: hcon->le_per_adv_data,
2016 eir_len: hcon->le_per_adv_data_len,
2017 EIR_BAA_SERVICE_UUID,
2018 len: &base_len);
2019
2020 if (!base || base_len > BASE_MAX_LENGTH)
2021 goto done;
2022
2023 memcpy(iso_pi(sk)->base, base, base_len);
2024 iso_pi(sk)->base_len = base_len;
2025 } else {
2026 /* This is a PA data fragment. Keep pa_data_len set to 0
2027 * until all data has been reassembled.
2028 */
2029 hcon->le_per_adv_data_len = 0;
2030 }
2031 } else {
2032 sk = iso_get_sock_listen(src: &hdev->bdaddr, BDADDR_ANY, NULL, NULL);
2033 }
2034
2035done:
2036 if (!sk)
2037 return 0;
2038
2039 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
2040 *flags |= HCI_PROTO_DEFER;
2041
2042 sock_put(sk);
2043
2044 return HCI_LM_ACCEPT;
2045}
2046
2047static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
2048{
2049 if (hcon->type != ISO_LINK) {
2050 if (hcon->type != LE_LINK)
2051 return;
2052
2053 /* Check if LE link has failed */
2054 if (status) {
2055 struct hci_link *link, *t;
2056
2057 list_for_each_entry_safe(link, t, &hcon->link_list,
2058 list)
2059 iso_conn_del(hcon: link->conn, err: bt_to_errno(code: status));
2060
2061 return;
2062 }
2063
2064 /* Create CIS if pending */
2065 hci_le_create_cis_pending(hdev: hcon->hdev);
2066 return;
2067 }
2068
2069 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
2070
2071 /* Similar to the success case, if HCI_CONN_BIG_SYNC_FAILED or
2072 * HCI_CONN_PA_SYNC_FAILED is set, queue the failed connection
2073 * into the accept queue of the listening socket and wake up
2074 * userspace, to inform the user about the event.
2075 */
2076 if (!status || test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags) ||
2077 test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
2078 struct iso_conn *conn;
2079
2080 conn = iso_conn_add(hcon);
2081 if (conn)
2082 iso_conn_ready(conn);
2083 } else {
2084 iso_conn_del(hcon, err: bt_to_errno(code: status));
2085 }
2086}
2087
2088static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
2089{
2090 if (hcon->type != ISO_LINK)
2091 return;
2092
2093 BT_DBG("hcon %p reason %d", hcon, reason);
2094
2095 iso_conn_del(hcon, err: bt_to_errno(code: reason));
2096}
2097
2098void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
2099{
2100 struct iso_conn *conn = hcon->iso_data;
2101 __u16 pb, ts, len;
2102
2103 if (!conn)
2104 goto drop;
2105
2106 pb = hci_iso_flags_pb(flags);
2107 ts = hci_iso_flags_ts(flags);
2108
2109 BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);
2110
2111 switch (pb) {
2112 case ISO_START:
2113 case ISO_SINGLE:
2114 if (conn->rx_len) {
2115 BT_ERR("Unexpected start frame (len %d)", skb->len);
2116 kfree_skb(skb: conn->rx_skb);
2117 conn->rx_skb = NULL;
2118 conn->rx_len = 0;
2119 }
2120
2121 if (ts) {
2122 struct hci_iso_ts_data_hdr *hdr;
2123
2124 /* TODO: add timestamp to the packet? */
2125 hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
2126 if (!hdr) {
2127 BT_ERR("Frame is too short (len %d)", skb->len);
2128 goto drop;
2129 }
2130
2131 len = __le16_to_cpu(hdr->slen);
2132 } else {
2133 struct hci_iso_data_hdr *hdr;
2134
2135 hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
2136 if (!hdr) {
2137 BT_ERR("Frame is too short (len %d)", skb->len);
2138 goto drop;
2139 }
2140
2141 len = __le16_to_cpu(hdr->slen);
2142 }
2143
2144 flags = hci_iso_data_flags(len);
2145 len = hci_iso_data_len(len);
2146
2147 BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x", len,
2148 skb->len, flags);
2149
2150 if (len == skb->len) {
2151 /* Complete frame received */
2152 hci_skb_pkt_status(skb) = flags & 0x03;
2153 iso_recv_frame(conn, skb);
2154 return;
2155 }
2156
2157 if (pb == ISO_SINGLE) {
2158 BT_ERR("Frame malformed (len %d, expected len %d)",
2159 skb->len, len);
2160 goto drop;
2161 }
2162
2163 if (skb->len > len) {
2164 BT_ERR("Frame is too long (len %d, expected len %d)",
2165 skb->len, len);
2166 goto drop;
2167 }
2168
2169 /* Allocate skb for the complete frame (with header) */
2170 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
2171 if (!conn->rx_skb)
2172 goto drop;
2173
2174 hci_skb_pkt_status(conn->rx_skb) = flags & 0x03;
2175 skb_copy_from_linear_data(skb, to: skb_put(skb: conn->rx_skb, len: skb->len),
2176 len: skb->len);
2177 conn->rx_len = len - skb->len;
2178 break;
2179
2180 case ISO_CONT:
2181 BT_DBG("Cont: frag len %d (expecting %d)", skb->len,
2182 conn->rx_len);
2183
2184 if (!conn->rx_len) {
2185 BT_ERR("Unexpected continuation frame (len %d)",
2186 skb->len);
2187 goto drop;
2188 }
2189
2190 if (skb->len > conn->rx_len) {
2191 BT_ERR("Fragment is too long (len %d, expected %d)",
2192 skb->len, conn->rx_len);
2193 kfree_skb(skb: conn->rx_skb);
2194 conn->rx_skb = NULL;
2195 conn->rx_len = 0;
2196 goto drop;
2197 }
2198
2199 skb_copy_from_linear_data(skb, to: skb_put(skb: conn->rx_skb, len: skb->len),
2200 len: skb->len);
2201 conn->rx_len -= skb->len;
2202 return;
2203
2204 case ISO_END:
2205 skb_copy_from_linear_data(skb, to: skb_put(skb: conn->rx_skb, len: skb->len),
2206 len: skb->len);
2207 conn->rx_len -= skb->len;
2208
2209 if (!conn->rx_len) {
2210 struct sk_buff *rx_skb = conn->rx_skb;
2211
2212 /* Complete frame received. iso_recv_frame
2213 * takes ownership of the skb so set the global
2214 * rx_skb pointer to NULL first.
2215 */
2216 conn->rx_skb = NULL;
2217 iso_recv_frame(conn, skb: rx_skb);
2218 }
2219 break;
2220 }
2221
2222drop:
2223 kfree_skb(skb);
2224}
2225
2226static struct hci_cb iso_cb = {
2227 .name = "ISO",
2228 .connect_cfm = iso_connect_cfm,
2229 .disconn_cfm = iso_disconn_cfm,
2230};
2231
2232static int iso_debugfs_show(struct seq_file *f, void *p)
2233{
2234 struct sock *sk;
2235
2236 read_lock(&iso_sk_list.lock);
2237
2238 sk_for_each(sk, &iso_sk_list.head) {
2239 seq_printf(m: f, fmt: "%pMR %pMR %d\n", &iso_pi(sk)->src,
2240 &iso_pi(sk)->dst, sk->sk_state);
2241 }
2242
2243 read_unlock(&iso_sk_list.lock);
2244
2245 return 0;
2246}
2247
2248DEFINE_SHOW_ATTRIBUTE(iso_debugfs);
2249
2250static struct dentry *iso_debugfs;
2251
2252static const struct proto_ops iso_sock_ops = {
2253 .family = PF_BLUETOOTH,
2254 .owner = THIS_MODULE,
2255 .release = iso_sock_release,
2256 .bind = iso_sock_bind,
2257 .connect = iso_sock_connect,
2258 .listen = iso_sock_listen,
2259 .accept = iso_sock_accept,
2260 .getname = iso_sock_getname,
2261 .sendmsg = iso_sock_sendmsg,
2262 .recvmsg = iso_sock_recvmsg,
2263 .poll = bt_sock_poll,
2264 .ioctl = bt_sock_ioctl,
2265 .mmap = sock_no_mmap,
2266 .socketpair = sock_no_socketpair,
2267 .shutdown = iso_sock_shutdown,
2268 .setsockopt = iso_sock_setsockopt,
2269 .getsockopt = iso_sock_getsockopt
2270};
2271
2272static const struct net_proto_family iso_sock_family_ops = {
2273 .family = PF_BLUETOOTH,
2274 .owner = THIS_MODULE,
2275 .create = iso_sock_create,
2276};
2277
2278static bool iso_inited;
2279
2280bool iso_enabled(void)
2281{
2282 return iso_inited;
2283}
2284
2285int iso_init(void)
2286{
2287 int err;
2288
2289 BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr));
2290
2291 if (iso_inited)
2292 return -EALREADY;
2293
2294 err = proto_register(prot: &iso_proto, alloc_slab: 0);
2295 if (err < 0)
2296 return err;
2297
2298 err = bt_sock_register(BTPROTO_ISO, ops: &iso_sock_family_ops);
2299 if (err < 0) {
2300 BT_ERR("ISO socket registration failed");
2301 goto error;
2302 }
2303
2304 err = bt_procfs_init(net: &init_net, name: "iso", sk_list: &iso_sk_list, NULL);
2305 if (err < 0) {
2306 BT_ERR("Failed to create ISO proc file");
2307 bt_sock_unregister(BTPROTO_ISO);
2308 goto error;
2309 }
2310
2311 BT_INFO("ISO socket layer initialized");
2312
2313 hci_register_cb(hcb: &iso_cb);
2314
2315 if (IS_ERR_OR_NULL(ptr: bt_debugfs))
2316 return 0;
2317
2318 if (!iso_debugfs) {
2319 iso_debugfs = debugfs_create_file(name: "iso", mode: 0444, parent: bt_debugfs,
2320 NULL, fops: &iso_debugfs_fops);
2321 }
2322
2323 iso_inited = true;
2324
2325 return 0;
2326
2327error:
2328 proto_unregister(prot: &iso_proto);
2329 return err;
2330}
2331
2332int iso_exit(void)
2333{
2334 if (!iso_inited)
2335 return -EALREADY;
2336
2337 bt_procfs_cleanup(net: &init_net, name: "iso");
2338
2339 debugfs_remove(dentry: iso_debugfs);
2340 iso_debugfs = NULL;
2341
2342 hci_unregister_cb(hcb: &iso_cb);
2343
2344 bt_sock_unregister(BTPROTO_ISO);
2345
2346 proto_unregister(prot: &iso_proto);
2347
2348 iso_inited = false;
2349
2350 return 0;
2351}
2352

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