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