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 #include <linux/uio.h>
14
15 #include <net/bluetooth/bluetooth.h>
16 #include <net/bluetooth/hci_core.h>
17 #include <net/bluetooth/iso.h>
18 #include "eir.h"
19
20 static const struct proto_ops iso_sock_ops;
21
22 static struct bt_sock_list iso_sk_list = {
23 .lock = __RW_LOCK_UNLOCKED(iso_sk_list.lock)
24 };
25
26 /* ---- ISO connections ---- */
27 enum {
28 ISO_CONN_DROPPED,
29 __ISO_CONN_NUM_FLAGS
30 };
31
32 struct iso_conn {
33 struct hci_conn *hcon;
34 DECLARE_BITMAP(flags, __ISO_CONN_NUM_FLAGS);
35
36 /* @lock: spinlock protecting changes to iso_conn fields */
37 spinlock_t lock;
38 struct sock *sk;
39
40 struct sk_buff *rx_skb;
41 __u32 rx_len;
42 __u16 tx_sn;
43 struct kref ref;
44 };
45
46 #define iso_conn_lock(c) spin_lock(&(c)->lock)
47 #define iso_conn_unlock(c) spin_unlock(&(c)->lock)
48
49 static void iso_sock_close(struct sock *sk);
50 static void iso_sock_kill(struct sock *sk);
51
52 /* ----- ISO socket info ----- */
53 #define iso_pi(sk) ((struct iso_pinfo *)sk)
54
55 #define EIR_SERVICE_DATA_LENGTH 4
56 #define BASE_MAX_LENGTH (HCI_MAX_PER_AD_LENGTH - EIR_SERVICE_DATA_LENGTH)
57 #define EIR_BAA_SERVICE_UUID 0x1851
58
59 /* iso_pinfo flags values */
60 enum {
61 BT_SK_BIG_SYNC,
62 BT_SK_PA_SYNC,
63 BT_SK_KILLED,
64 };
65
66 struct iso_pinfo {
67 struct bt_sock bt;
68 bdaddr_t src;
69 __u8 src_type;
70 bdaddr_t dst;
71 __u8 dst_type;
72 __u8 bc_sid;
73 __u8 bc_num_bis;
74 __u8 bc_bis[ISO_MAX_NUM_BIS];
75 __u16 sync_handle;
76 unsigned long flags;
77 struct bt_iso_qos qos;
78 bool qos_user_set;
79 __u8 base_len;
80 __u8 base[BASE_MAX_LENGTH];
81 struct iso_conn *conn;
82 struct delayed_work timeout_work;
83 };
84
85 static struct bt_iso_qos default_qos;
86
87 static bool check_ucast_qos(struct bt_iso_qos *qos);
88 static bool check_bcast_qos(struct bt_iso_qos *qos);
89 static bool iso_match_sid(struct sock *sk, void *data);
90 static bool iso_match_sid_past(struct sock *sk, void *data);
91 static bool iso_match_sync_handle(struct sock *sk, void *data);
92 static bool iso_match_sync_handle_pa_report(struct sock *sk, void *data);
93 static void iso_sock_disconn(struct sock *sk);
94
95 typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);
96
97 static struct sock *iso_get_sock(struct hci_dev *hdev, bdaddr_t *src,
98 bdaddr_t *dst, enum bt_sock_state state,
99 iso_sock_match_t match, void *data);
100
101 /* ---- ISO timers ---- */
102 #define ISO_CONN_TIMEOUT secs_to_jiffies(20)
103 #define ISO_DISCONN_TIMEOUT secs_to_jiffies(2)
104
iso_conn_free(struct kref * ref)105 static void iso_conn_free(struct kref *ref)
106 {
107 struct iso_conn *conn = container_of(ref, struct iso_conn, ref);
108
109 BT_DBG("conn %p", conn);
110
111 if (conn->hcon) {
112 spin_lock(&conn->hcon->proto_lock);
113
114 /* Check we are not racing with iso_conn_add */
115 if (conn->hcon->iso_data == conn) {
116 conn->hcon->iso_data = NULL;
117 if (!test_and_set_bit(ISO_CONN_DROPPED, conn->flags))
118 hci_conn_drop(conn->hcon);
119 }
120
121 spin_unlock(&conn->hcon->proto_lock);
122 }
123
124 kfree_skb(conn->rx_skb);
125
126 kfree(conn);
127 }
128
iso_conn_put(struct iso_conn * conn)129 static void iso_conn_put(struct iso_conn *conn)
130 {
131 if (!conn)
132 return;
133
134 BT_DBG("conn %p refcnt %d", conn, kref_read(&conn->ref));
135
136 /* The following race vs. iso_conn_del() is possible:
137 *
138 * 1. conn->hcon != NULL here
139 * 2. kref_put puts the last reference
140 * 3. concurrent iso_conn_del() gets iso_conn_hold_unless_zero() -> NULL
141 * and returns immediately, so conn->hcon is not cleared
142 * 4. iso_conn_free() dereferences conn->hcon
143 *
144 * To avoid UAF in step 4, take RCU before decrementing the refcount.
145 */
146 rcu_read_lock();
147
148 kref_put(&conn->ref, iso_conn_free);
149
150 rcu_read_unlock();
151 }
152
iso_conn_hold_unless_zero(struct iso_conn * conn)153 static struct iso_conn *iso_conn_hold_unless_zero(struct iso_conn *conn)
154 {
155 if (!conn)
156 return NULL;
157
158 BT_DBG("conn %p refcnt %u", conn, kref_read(&conn->ref));
159
160 if (!kref_get_unless_zero(&conn->ref))
161 return NULL;
162
163 return conn;
164 }
165
iso_conn_hold(struct iso_conn * conn)166 static struct iso_conn *iso_conn_hold(struct iso_conn *conn)
167 {
168 BT_DBG("conn %p refcnt %u", conn, kref_read(&conn->ref));
169
170 kref_get(&conn->ref);
171 return conn;
172 }
173
iso_sock_hold(struct iso_conn * conn)174 static struct sock *iso_sock_hold(struct iso_conn *conn)
175 {
176 if (!conn || !bt_sock_linked(&iso_sk_list, conn->sk))
177 return NULL;
178
179 sock_hold(conn->sk);
180
181 return conn->sk;
182 }
183
iso_sock_timeout(struct work_struct * work)184 static void iso_sock_timeout(struct work_struct *work)
185 {
186 struct iso_pinfo *pi = container_of(work, struct iso_pinfo,
187 timeout_work.work);
188 struct sock *sk = &pi->bt.sk;
189
190 BT_DBG("sock %p state %d", sk, sk->sk_state);
191
192 lock_sock(sk);
193 if (!sock_flag(sk, SOCK_ZAPPED)) {
194 sk->sk_err = ETIMEDOUT;
195 sk->sk_state_change(sk);
196 }
197 release_sock(sk);
198 }
199
iso_sock_set_timer(struct sock * sk,long timeout)200 static void iso_sock_set_timer(struct sock *sk, long timeout)
201 {
202 lockdep_assert(lockdep_sock_is_held(sk));
203
204 cancel_delayed_work(&iso_pi(sk)->timeout_work);
205
206 if (!iso_pi(sk)->conn)
207 return;
208
209 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
210 schedule_delayed_work(&iso_pi(sk)->timeout_work, timeout);
211 }
212
iso_sock_clear_timer(struct sock * sk)213 static void iso_sock_clear_timer(struct sock *sk)
214 {
215 BT_DBG("sock %p state %d", sk, sk->sk_state);
216 cancel_delayed_work(&iso_pi(sk)->timeout_work);
217 }
218
iso_sock_disable_timer(struct sock * sk)219 static void iso_sock_disable_timer(struct sock *sk)
220 {
221 lockdep_assert(!lockdep_sock_is_held(sk));
222
223 BT_DBG("sock %p state %d", sk, sk->sk_state);
224 disable_delayed_work_sync(&iso_pi(sk)->timeout_work);
225 }
226
227 /* ---- ISO connections ---- */
iso_conn_add(struct hci_conn * hcon)228 static struct iso_conn *iso_conn_add(struct hci_conn *hcon)
229 __must_hold(&hcon->hdev->lock)
230 {
231 struct iso_conn *conn;
232
233 spin_lock(&hcon->proto_lock);
234
235 conn = iso_conn_hold_unless_zero(hcon->iso_data);
236 if (conn) {
237 if (!conn->hcon) {
238 iso_conn_lock(conn);
239 conn->hcon = hcon;
240 iso_conn_unlock(conn);
241 }
242 spin_unlock(&hcon->proto_lock);
243 return conn;
244 }
245
246 conn = kzalloc_obj(*conn, GFP_ATOMIC);
247 if (!conn) {
248 spin_unlock(&hcon->proto_lock);
249 return NULL;
250 }
251
252 kref_init(&conn->ref);
253 spin_lock_init(&conn->lock);
254
255 hcon->iso_data = conn;
256 conn->hcon = hcon;
257 conn->tx_sn = 0;
258
259 spin_unlock(&hcon->proto_lock);
260
261 BT_DBG("hcon %p conn %p", hcon, conn);
262
263 return conn;
264 }
265
266 /* Delete channel. Must be called on the locked socket. */
iso_chan_del(struct sock * sk,int err)267 static void iso_chan_del(struct sock *sk, int err)
268 {
269 struct iso_conn *conn;
270 struct sock *parent;
271
272 conn = iso_pi(sk)->conn;
273 iso_pi(sk)->conn = NULL;
274
275 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
276
277 if (conn) {
278 iso_conn_lock(conn);
279 conn->sk = NULL;
280 iso_conn_unlock(conn);
281 iso_conn_put(conn);
282 }
283
284 sk->sk_state = BT_CLOSED;
285 sk->sk_err = err;
286
287 parent = bt_sk(sk)->parent;
288 if (parent) {
289 bt_accept_unlink(sk);
290 parent->sk_data_ready(parent);
291 } else {
292 sk->sk_state_change(sk);
293 }
294
295 sock_set_flag(sk, SOCK_ZAPPED);
296 }
297
iso_conn_del(struct hci_conn * hcon,int err)298 static void iso_conn_del(struct hci_conn *hcon, int err)
299 __must_hold(&hcon->hdev->lock)
300 {
301 struct iso_conn *conn;
302 struct sock *sk;
303
304 spin_lock(&hcon->proto_lock);
305 conn = iso_conn_hold_unless_zero(hcon->iso_data);
306 spin_unlock(&hcon->proto_lock);
307 if (!conn)
308 return;
309
310 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
311
312 /* Kill socket */
313 iso_conn_lock(conn);
314 sk = iso_sock_hold(conn);
315 iso_conn_unlock(conn);
316
317 if (!sk)
318 goto done;
319
320 iso_sock_disable_timer(sk);
321
322 lock_sock(sk);
323 iso_chan_del(sk, err);
324 release_sock(sk);
325 iso_sock_kill(sk);
326 sock_put(sk);
327
328 done:
329 /* No sk access to conn->hcon any more (lock_sock + hdev->lock) */
330 spin_lock(&hcon->proto_lock);
331 iso_conn_lock(conn);
332 conn->hcon = NULL;
333 hcon->iso_data = NULL;
334 iso_conn_unlock(conn);
335 spin_unlock(&hcon->proto_lock);
336
337 iso_conn_put(conn);
338 }
339
__iso_chan_add(struct iso_conn * conn,struct sock * sk,struct sock * parent)340 static int __iso_chan_add(struct iso_conn *conn, struct sock *sk,
341 struct sock *parent)
342 {
343 BT_DBG("conn %p", conn);
344
345 if (iso_pi(sk)->conn == conn && conn->sk == sk)
346 return 0;
347
348 if (conn->sk) {
349 BT_ERR("conn->sk already set");
350 return -EBUSY;
351 }
352
353 if (!conn->hcon) {
354 BT_ERR("conn->hcon missing");
355 return -EIO;
356 }
357
358 iso_pi(sk)->conn = iso_conn_hold(conn);
359 conn->sk = sk;
360 clear_bit(ISO_CONN_DROPPED, conn->flags);
361
362 if (parent)
363 bt_accept_enqueue(parent, sk, true);
364
365 return 0;
366 }
367
iso_chan_add(struct iso_conn * conn,struct sock * sk,struct sock * parent)368 static int iso_chan_add(struct iso_conn *conn, struct sock *sk,
369 struct sock *parent)
370 {
371 int err;
372
373 iso_conn_lock(conn);
374 err = __iso_chan_add(conn, sk, parent);
375 iso_conn_unlock(conn);
376
377 return err;
378 }
379
le_addr_type(u8 bdaddr_type)380 static inline u8 le_addr_type(u8 bdaddr_type)
381 {
382 if (bdaddr_type == BDADDR_LE_PUBLIC)
383 return ADDR_LE_DEV_PUBLIC;
384 else
385 return ADDR_LE_DEV_RANDOM;
386 }
387
iso_connect_bis(struct sock * sk)388 static int iso_connect_bis(struct sock *sk)
389 {
390 struct iso_conn *conn;
391 struct hci_conn *hcon;
392 struct hci_dev *hdev;
393 bdaddr_t src, dst;
394 u8 src_type, bc_sid;
395 int err;
396
397 lock_sock(sk);
398 bacpy(&src, &iso_pi(sk)->src);
399 bacpy(&dst, &iso_pi(sk)->dst);
400 src_type = iso_pi(sk)->src_type;
401 bc_sid = iso_pi(sk)->bc_sid;
402 release_sock(sk);
403
404 BT_DBG("%pMR (SID 0x%2.2x)", &src, bc_sid);
405
406 hdev = hci_get_route(&dst, &src, src_type);
407 if (!hdev)
408 return -EHOSTUNREACH;
409
410 hci_dev_lock(hdev);
411 lock_sock(sk);
412
413 if (!bis_capable(hdev)) {
414 err = -EOPNOTSUPP;
415 goto unlock;
416 }
417
418 /* Fail if user set invalid QoS */
419 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(&iso_pi(sk)->qos)) {
420 iso_pi(sk)->qos = default_qos;
421 err = -EINVAL;
422 goto unlock;
423 }
424
425 /* Fail if out PHYs are marked as disabled */
426 if (!iso_pi(sk)->qos.bcast.out.phys) {
427 err = -EINVAL;
428 goto unlock;
429 }
430
431 /* Just bind if DEFER_SETUP has been set */
432 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
433 hcon = hci_bind_bis(hdev, &iso_pi(sk)->dst, iso_pi(sk)->bc_sid,
434 &iso_pi(sk)->qos, iso_pi(sk)->base_len,
435 iso_pi(sk)->base,
436 READ_ONCE(sk->sk_sndtimeo));
437 if (IS_ERR(hcon)) {
438 err = PTR_ERR(hcon);
439 goto unlock;
440 }
441 } else {
442 hcon = hci_connect_bis(hdev, &iso_pi(sk)->dst,
443 le_addr_type(iso_pi(sk)->dst_type),
444 iso_pi(sk)->bc_sid, &iso_pi(sk)->qos,
445 iso_pi(sk)->base_len, iso_pi(sk)->base,
446 READ_ONCE(sk->sk_sndtimeo));
447 if (IS_ERR(hcon)) {
448 err = PTR_ERR(hcon);
449 goto unlock;
450 }
451
452 /* Update SID if it was not set */
453 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID)
454 iso_pi(sk)->bc_sid = hcon->sid;
455 }
456
457 lockdep_assert_held(&hcon->hdev->lock);
458
459 conn = iso_conn_add(hcon);
460 if (!conn) {
461 hci_conn_drop(hcon);
462 err = -ENOMEM;
463 goto unlock;
464 }
465
466 err = iso_chan_add(conn, sk, NULL);
467 iso_conn_put(conn);
468 if (err)
469 goto unlock;
470
471 /* Update source addr of the socket */
472 bacpy(&iso_pi(sk)->src, &hcon->src);
473
474 if (hcon->state == BT_CONNECTED) {
475 iso_sock_clear_timer(sk);
476 sk->sk_state = BT_CONNECTED;
477 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
478 iso_sock_clear_timer(sk);
479 sk->sk_state = BT_CONNECT;
480 } else {
481 sk->sk_state = BT_CONNECT;
482 iso_sock_set_timer(sk, READ_ONCE(sk->sk_sndtimeo));
483 }
484
485 unlock:
486 release_sock(sk);
487 hci_dev_unlock(hdev);
488 hci_dev_put(hdev);
489 return err;
490 }
491
iso_connect_cis(struct sock * sk)492 static int iso_connect_cis(struct sock *sk)
493 {
494 struct iso_conn *conn;
495 struct hci_conn *hcon;
496 struct hci_dev *hdev;
497 bdaddr_t src, dst;
498 u8 src_type;
499 bool already_attached;
500 int err;
501
502 lock_sock(sk);
503 bacpy(&src, &iso_pi(sk)->src);
504 bacpy(&dst, &iso_pi(sk)->dst);
505 src_type = iso_pi(sk)->src_type;
506 release_sock(sk);
507
508 BT_DBG("%pMR -> %pMR", &src, &dst);
509
510 hdev = hci_get_route(&dst, &src, src_type);
511 if (!hdev)
512 return -EHOSTUNREACH;
513
514 hci_dev_lock(hdev);
515 lock_sock(sk);
516
517 if (!cis_central_capable(hdev)) {
518 err = -EOPNOTSUPP;
519 goto unlock;
520 }
521
522 /* Fail if user set invalid QoS */
523 if (iso_pi(sk)->qos_user_set && !check_ucast_qos(&iso_pi(sk)->qos)) {
524 iso_pi(sk)->qos = default_qos;
525 err = -EINVAL;
526 goto unlock;
527 }
528
529 /* Fail if either PHYs are marked as disabled */
530 if (!iso_pi(sk)->qos.ucast.in.phys && !iso_pi(sk)->qos.ucast.out.phys) {
531 err = -EINVAL;
532 goto unlock;
533 }
534
535 /* Check if there are available buffers for output/TX. */
536 if (iso_pi(sk)->qos.ucast.out.sdu && !hci_iso_count(hdev) &&
537 (hdev->iso_pkts && !hdev->iso_cnt)) {
538 err = -ENOBUFS;
539 goto unlock;
540 }
541
542 /* Just bind if DEFER_SETUP has been set */
543 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
544 hcon = hci_bind_cis(hdev, &iso_pi(sk)->dst,
545 le_addr_type(iso_pi(sk)->dst_type),
546 &iso_pi(sk)->qos,
547 READ_ONCE(sk->sk_sndtimeo));
548 if (IS_ERR(hcon)) {
549 err = PTR_ERR(hcon);
550 goto unlock;
551 }
552 } else {
553 hcon = hci_connect_cis(hdev, &iso_pi(sk)->dst,
554 le_addr_type(iso_pi(sk)->dst_type),
555 &iso_pi(sk)->qos,
556 READ_ONCE(sk->sk_sndtimeo));
557 if (IS_ERR(hcon)) {
558 err = PTR_ERR(hcon);
559 goto unlock;
560 }
561 }
562
563 lockdep_assert_held(&hcon->hdev->lock);
564
565 conn = iso_conn_add(hcon);
566 if (!conn) {
567 hci_conn_drop(hcon);
568 err = -ENOMEM;
569 goto unlock;
570 }
571
572 iso_conn_lock(conn);
573 already_attached = iso_pi(sk)->conn == conn && conn->sk == sk;
574 iso_conn_unlock(conn);
575
576 err = iso_chan_add(conn, sk, NULL);
577 iso_conn_put(conn);
578 if (already_attached || err == -EBUSY)
579 hci_conn_drop(hcon);
580 if (err)
581 goto unlock;
582
583 /* Update source addr of the socket */
584 bacpy(&iso_pi(sk)->src, &hcon->src);
585
586 if (hcon->state == BT_CONNECTED) {
587 iso_sock_clear_timer(sk);
588 sk->sk_state = BT_CONNECTED;
589 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
590 iso_sock_clear_timer(sk);
591 sk->sk_state = BT_CONNECT;
592 } else {
593 sk->sk_state = BT_CONNECT;
594 iso_sock_set_timer(sk, READ_ONCE(sk->sk_sndtimeo));
595 }
596
597 unlock:
598 release_sock(sk);
599 hci_dev_unlock(hdev);
600 hci_dev_put(hdev);
601 return err;
602 }
603
iso_sock_get_qos(struct sock * sk)604 static struct bt_iso_qos *iso_sock_get_qos(struct sock *sk)
605 {
606 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
607 return &iso_pi(sk)->conn->hcon->iso_qos;
608
609 return &iso_pi(sk)->qos;
610 }
611
iso_send_frame(struct sock * sk,struct sk_buff * skb,const struct sockcm_cookie * sockc)612 static int iso_send_frame(struct sock *sk, struct sk_buff *skb,
613 const struct sockcm_cookie *sockc)
614 {
615 struct iso_conn *conn = iso_pi(sk)->conn;
616 struct bt_iso_qos *qos = iso_sock_get_qos(sk);
617 struct hci_iso_data_hdr *hdr;
618 int len = 0;
619
620 BT_DBG("sk %p len %d", sk, skb->len);
621
622 if (skb->len > qos->ucast.out.sdu)
623 return -EMSGSIZE;
624
625 len = skb->len;
626
627 /* Push ISO data header */
628 hdr = skb_push(skb, HCI_ISO_DATA_HDR_SIZE);
629 hdr->sn = cpu_to_le16(conn->tx_sn++);
630 hdr->slen = cpu_to_le16(hci_iso_data_len_pack(len,
631 HCI_ISO_STATUS_VALID));
632
633 if (sk->sk_state == BT_CONNECTED) {
634 hci_setup_tx_timestamp(skb, 1, sockc);
635 hci_send_iso(conn->hcon, skb);
636 } else {
637 len = -ENOTCONN;
638 }
639
640 return len;
641 }
642
iso_recv_frame(struct iso_conn * conn,struct sk_buff * skb)643 static void iso_recv_frame(struct iso_conn *conn, struct sk_buff *skb)
644 {
645 struct sock *sk;
646
647 iso_conn_lock(conn);
648 sk = iso_sock_hold(conn);
649 iso_conn_unlock(conn);
650
651 if (!sk)
652 goto drop;
653
654 BT_DBG("sk %p len %d", sk, skb->len);
655
656 if (sk->sk_state != BT_CONNECTED)
657 goto drop_put;
658
659 if (!sock_queue_rcv_skb(sk, skb)) {
660 sock_put(sk);
661 return;
662 }
663
664 drop_put:
665 sock_put(sk);
666 drop:
667 kfree_skb(skb);
668 }
669
670 /* -------- Socket interface ---------- */
__iso_get_sock_listen_by_addr(bdaddr_t * src,bdaddr_t * dst)671 static struct sock *__iso_get_sock_listen_by_addr(bdaddr_t *src, bdaddr_t *dst)
672 {
673 struct sock *sk;
674
675 sk_for_each(sk, &iso_sk_list.head) {
676 if (sk->sk_state != BT_LISTEN)
677 continue;
678
679 if (bacmp(&iso_pi(sk)->dst, dst))
680 continue;
681
682 if (!bacmp(&iso_pi(sk)->src, src))
683 return sk;
684 }
685
686 return NULL;
687 }
688
__iso_get_sock_listen_by_sid(bdaddr_t * ba,bdaddr_t * bc,__u8 sid)689 static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
690 __u8 sid)
691 {
692 struct sock *sk;
693
694 sk_for_each(sk, &iso_sk_list.head) {
695 if (sk->sk_state != BT_LISTEN)
696 continue;
697
698 if (bacmp(&iso_pi(sk)->src, ba))
699 continue;
700
701 if (bacmp(&iso_pi(sk)->dst, bc))
702 continue;
703
704 if (iso_pi(sk)->bc_sid == sid)
705 return sk;
706 }
707
708 return NULL;
709 }
710
711 /* Find socket in given state:
712 * source bdaddr (Unicast)
713 * destination bdaddr (Broadcast only)
714 * match func - pass NULL to ignore
715 * match func data - pass -1 to ignore
716 * Returns closest match.
717 */
iso_get_sock(struct hci_dev * hdev,bdaddr_t * src,bdaddr_t * dst,enum bt_sock_state state,iso_sock_match_t match,void * data)718 static struct sock *iso_get_sock(struct hci_dev *hdev, bdaddr_t *src,
719 bdaddr_t *dst, enum bt_sock_state state,
720 iso_sock_match_t match, void *data)
721 {
722 struct sock *sk = NULL, *sk1 = NULL;
723
724 read_lock(&iso_sk_list.lock);
725
726 sk_for_each(sk, &iso_sk_list.head) {
727 if (sk->sk_state != state)
728 continue;
729
730 /* Match Broadcast destination */
731 if (bacmp(dst, BDADDR_ANY) && bacmp(&iso_pi(sk)->dst, dst)) {
732 struct smp_irk *irk1, *irk2;
733
734 /* Check if destination is an RPA that we can resolve */
735 irk1 = hci_find_irk_by_rpa(hdev, dst);
736 if (!irk1)
737 continue;
738
739 /* Match with identity address */
740 if (bacmp(&iso_pi(sk)->dst, &irk1->bdaddr)) {
741 /* Check if socket destination address is also
742 * an RPA and if the IRK matches.
743 */
744 irk2 = hci_find_irk_by_rpa(hdev,
745 &iso_pi(sk)->dst);
746 if (!irk2 || irk1 != irk2)
747 continue;
748 }
749 }
750
751 /* Use Match function if provided */
752 if (match && !match(sk, data))
753 continue;
754
755 /* Exact match. */
756 if (!bacmp(&iso_pi(sk)->src, src)) {
757 sock_hold(sk);
758 break;
759 }
760
761 /* Closest match */
762 if (!bacmp(&iso_pi(sk)->src, BDADDR_ANY)) {
763 if (sk1)
764 sock_put(sk1);
765
766 sk1 = sk;
767 sock_hold(sk1);
768 }
769 }
770
771 if (sk && sk1)
772 sock_put(sk1);
773
774 read_unlock(&iso_sk_list.lock);
775
776 return sk ? sk : sk1;
777 }
778
iso_get_sock_big(struct sock * match_sk,bdaddr_t * src,bdaddr_t * dst,uint8_t big)779 static struct sock *iso_get_sock_big(struct sock *match_sk, bdaddr_t *src,
780 bdaddr_t *dst, uint8_t big)
781 {
782 struct sock *sk = NULL;
783
784 read_lock(&iso_sk_list.lock);
785
786 sk_for_each(sk, &iso_sk_list.head) {
787 if (match_sk == sk)
788 continue;
789
790 /* Look for sockets that have already been
791 * connected to the BIG
792 */
793 if (sk->sk_state != BT_CONNECTED &&
794 sk->sk_state != BT_CONNECT)
795 continue;
796
797 /* Match Broadcast destination */
798 if (bacmp(&iso_pi(sk)->dst, dst))
799 continue;
800
801 /* Match BIG handle */
802 if (iso_pi(sk)->qos.bcast.big != big)
803 continue;
804
805 /* Match source address */
806 if (bacmp(&iso_pi(sk)->src, src))
807 continue;
808
809 sock_hold(sk);
810 break;
811 }
812
813 read_unlock(&iso_sk_list.lock);
814
815 return sk;
816 }
817
iso_sock_destruct(struct sock * sk)818 static void iso_sock_destruct(struct sock *sk)
819 {
820 BT_DBG("sk %p", sk);
821
822 iso_conn_put(iso_pi(sk)->conn);
823
824 skb_queue_purge(&sk->sk_receive_queue);
825 skb_queue_purge(&sk->sk_write_queue);
826 skb_queue_purge(&sk->sk_error_queue);
827 }
828
829 /* Close not yet accepted channels */
iso_sock_flush_accept_q(struct sock * parent)830 static void iso_sock_flush_accept_q(struct sock *parent)
831 {
832 struct sock *sk;
833
834 while ((sk = bt_accept_dequeue(parent, NULL))) {
835 iso_sock_close(sk);
836 iso_sock_kill(sk);
837 /* Drop the reference handed back by bt_accept_dequeue(). */
838 sock_put(sk);
839 }
840 }
841
iso_sock_cleanup_listen(struct sock * parent)842 static void iso_sock_cleanup_listen(struct sock *parent)
843 {
844 BT_DBG("parent %p", parent);
845
846 iso_sock_flush_accept_q(parent);
847
848 /* If listening socket has a hcon, properly disconnect it */
849 if (iso_pi(parent)->conn && iso_pi(parent)->conn->hcon) {
850 iso_sock_disconn(parent);
851 return;
852 }
853
854 parent->sk_state = BT_CLOSED;
855 sock_set_flag(parent, SOCK_ZAPPED);
856 }
857
858 /* Kill socket (only if zapped and orphan)
859 * Must be called on unlocked socket.
860 */
iso_sock_kill(struct sock * sk)861 static void iso_sock_kill(struct sock *sk)
862 {
863 iso_sock_disable_timer(sk);
864
865 lock_sock(sk);
866
867 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||
868 test_bit(BT_SK_KILLED, &iso_pi(sk)->flags)) {
869 release_sock(sk);
870 return;
871 }
872
873 BT_DBG("sk %p state %d", sk, sk->sk_state);
874
875 /* Sock is dead, so set conn->sk to NULL to avoid possible UAF */
876 if (iso_pi(sk)->conn) {
877 iso_conn_lock(iso_pi(sk)->conn);
878 iso_pi(sk)->conn->sk = NULL;
879 iso_conn_unlock(iso_pi(sk)->conn);
880 }
881
882 /* Kill poor orphan */
883 bt_sock_unlink(&iso_sk_list, sk);
884 sock_set_flag(sk, SOCK_DEAD);
885 set_bit(BT_SK_KILLED, &iso_pi(sk)->flags);
886
887 release_sock(sk);
888 sock_put(sk);
889 }
890
iso_sock_disconn(struct sock * sk)891 static void iso_sock_disconn(struct sock *sk)
892 {
893 struct sock *bis_sk;
894 struct hci_conn *hcon = iso_pi(sk)->conn->hcon;
895
896 if (test_bit(HCI_CONN_BIG_CREATED, &hcon->flags)) {
897 bis_sk = iso_get_sock_big(sk, &iso_pi(sk)->src,
898 &iso_pi(sk)->dst,
899 iso_pi(sk)->qos.bcast.big);
900
901 /* If there are any other connected sockets for the
902 * same BIG, just delete the sk and leave the bis
903 * hcon active, in case later rebinding is needed.
904 */
905 if (bis_sk) {
906 hcon->state = BT_OPEN;
907 set_bit(ISO_CONN_DROPPED, iso_pi(sk)->conn->flags);
908
909 iso_sock_clear_timer(sk);
910 iso_chan_del(sk, bt_to_errno(hcon->abort_reason));
911 sock_put(bis_sk);
912 return;
913 }
914 }
915
916 sk->sk_state = BT_DISCONN;
917 if (!test_and_set_bit(ISO_CONN_DROPPED, iso_pi(sk)->conn->flags))
918 hci_conn_drop(iso_pi(sk)->conn->hcon);
919 }
920
__iso_sock_close(struct sock * sk)921 static void __iso_sock_close(struct sock *sk)
922 {
923 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
924
925 switch (sk->sk_state) {
926 case BT_LISTEN:
927 iso_sock_cleanup_listen(sk);
928 break;
929
930 case BT_CONNECT:
931 case BT_CONNECTED:
932 case BT_CONFIG:
933 if (iso_pi(sk)->conn->hcon)
934 iso_sock_disconn(sk);
935 else
936 iso_chan_del(sk, ECONNRESET);
937 break;
938
939 case BT_CONNECT2:
940 if (iso_pi(sk)->conn->hcon &&
941 (test_bit(HCI_CONN_PA_SYNC, &iso_pi(sk)->conn->hcon->flags) ||
942 test_bit(HCI_CONN_PA_SYNC_FAILED, &iso_pi(sk)->conn->hcon->flags)))
943 iso_sock_disconn(sk);
944 else
945 iso_chan_del(sk, ECONNRESET);
946 break;
947 case BT_DISCONN:
948 iso_chan_del(sk, ECONNRESET);
949 break;
950
951 default:
952 sock_set_flag(sk, SOCK_ZAPPED);
953 break;
954 }
955 }
956
957 /* Must be called on unlocked socket. */
iso_sock_close(struct sock * sk)958 static void iso_sock_close(struct sock *sk)
959 {
960 iso_sock_disable_timer(sk);
961
962 lock_sock(sk);
963 __iso_sock_close(sk);
964 release_sock(sk);
965 }
966
iso_sock_init(struct sock * sk,struct sock * parent)967 static void iso_sock_init(struct sock *sk, struct sock *parent)
968 {
969 BT_DBG("sk %p", sk);
970
971 if (parent) {
972 sk->sk_type = parent->sk_type;
973 bt_sk(sk)->flags = bt_sk(parent)->flags;
974 security_sk_clone(parent, sk);
975 }
976 }
977
978 static struct proto iso_proto = {
979 .name = "ISO",
980 .owner = THIS_MODULE,
981 .obj_size = sizeof(struct iso_pinfo)
982 };
983
984 #define DEFAULT_IO_QOS \
985 { \
986 .interval = 10000u, \
987 .latency = 10u, \
988 .sdu = 40u, \
989 .phys = BT_ISO_PHY_2M, \
990 .rtn = 2u, \
991 }
992
993 static struct bt_iso_qos default_qos = {
994 .bcast = {
995 .big = BT_ISO_QOS_BIG_UNSET,
996 .bis = BT_ISO_QOS_BIS_UNSET,
997 .sync_factor = 0x01,
998 .packing = 0x00,
999 .framing = 0x00,
1000 .in = DEFAULT_IO_QOS,
1001 .out = DEFAULT_IO_QOS,
1002 .encryption = 0x00,
1003 .bcode = {0x00},
1004 .options = 0x00,
1005 .skip = 0x0000,
1006 .sync_timeout = BT_ISO_SYNC_TIMEOUT,
1007 .sync_cte_type = 0x00,
1008 .mse = 0x00,
1009 .timeout = BT_ISO_SYNC_TIMEOUT,
1010 },
1011 };
1012
iso_sock_alloc(struct net * net,struct socket * sock,int proto,gfp_t prio,int kern)1013 static struct sock *iso_sock_alloc(struct net *net, struct socket *sock,
1014 int proto, gfp_t prio, int kern)
1015 {
1016 struct sock *sk;
1017
1018 sk = bt_sock_alloc(net, sock, &iso_proto, proto, prio, kern);
1019 if (!sk)
1020 return NULL;
1021
1022 sk->sk_destruct = iso_sock_destruct;
1023 sk->sk_sndtimeo = ISO_CONN_TIMEOUT;
1024
1025 /* Set address type as public as default src address is BDADDR_ANY */
1026 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
1027
1028 iso_pi(sk)->qos = default_qos;
1029 iso_pi(sk)->sync_handle = -1;
1030
1031 INIT_DELAYED_WORK(&iso_pi(sk)->timeout_work, iso_sock_timeout);
1032
1033 bt_sock_link(&iso_sk_list, sk);
1034 return sk;
1035 }
1036
iso_sock_create(struct net * net,struct socket * sock,int protocol,int kern)1037 static int iso_sock_create(struct net *net, struct socket *sock, int protocol,
1038 int kern)
1039 {
1040 struct sock *sk;
1041
1042 BT_DBG("sock %p", sock);
1043
1044 sock->state = SS_UNCONNECTED;
1045
1046 if (sock->type != SOCK_SEQPACKET)
1047 return -ESOCKTNOSUPPORT;
1048
1049 sock->ops = &iso_sock_ops;
1050
1051 sk = iso_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
1052 if (!sk)
1053 return -ENOMEM;
1054
1055 iso_sock_init(sk, NULL);
1056 return 0;
1057 }
1058
iso_sock_bind_bc(struct socket * sock,struct sockaddr_unsized * addr,int addr_len)1059 static int iso_sock_bind_bc(struct socket *sock, struct sockaddr_unsized *addr,
1060 int addr_len)
1061 {
1062 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1063 struct sock *sk = sock->sk;
1064 int i;
1065
1066 BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid,
1067 sa->iso_bc->bc_num_bis);
1068
1069 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc))
1070 return -EINVAL;
1071
1072 bacpy(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr);
1073
1074 /* Check if the address type is of LE type */
1075 if (!bdaddr_type_is_le(sa->iso_bc->bc_bdaddr_type))
1076 return -EINVAL;
1077
1078 iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
1079
1080 if (sa->iso_bc->bc_sid > 0x0f && sa->iso_bc->bc_sid != HCI_SID_INVALID)
1081 return -EINVAL;
1082
1083 iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
1084
1085 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS)
1086 return -EINVAL;
1087
1088 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
1089
1090 for (i = 0; i < iso_pi(sk)->bc_num_bis; i++)
1091 if (sa->iso_bc->bc_bis[i] < 0x01 ||
1092 sa->iso_bc->bc_bis[i] > 0x1f)
1093 return -EINVAL;
1094
1095 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
1096 iso_pi(sk)->bc_num_bis);
1097
1098 return 0;
1099 }
1100
1101 /* Must be called on the locked socket. */
iso_sock_rebind_bis(struct sock * sk,struct sockaddr_iso * sa,int addr_len)1102 static int iso_sock_rebind_bis(struct sock *sk, struct sockaddr_iso *sa,
1103 int addr_len)
1104 {
1105 int err = 0;
1106
1107 if (!test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags))
1108 return -EBADFD;
1109
1110 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS) {
1111 err = -EINVAL;
1112 goto done;
1113 }
1114
1115 for (int i = 0; i < sa->iso_bc->bc_num_bis; i++)
1116 if (sa->iso_bc->bc_bis[i] < 0x01 ||
1117 sa->iso_bc->bc_bis[i] > 0x1f) {
1118 err = -EINVAL;
1119 goto done;
1120 }
1121
1122 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
1123
1124 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
1125 iso_pi(sk)->bc_num_bis);
1126
1127 done:
1128 return err;
1129 }
1130
iso_conn_get_hdev(struct iso_conn * conn)1131 static struct hci_dev *iso_conn_get_hdev(struct iso_conn *conn)
1132 {
1133 struct hci_dev *hdev = NULL;
1134
1135 iso_conn_lock(conn);
1136 if (conn->hcon)
1137 hdev = hci_dev_hold(conn->hcon->hdev);
1138 iso_conn_unlock(conn);
1139
1140 return hdev;
1141 }
1142
1143 /* Must be called on the locked socket. */
iso_sock_rebind_bc(struct sock * sk,struct sockaddr_iso * sa,int addr_len)1144 static int iso_sock_rebind_bc(struct sock *sk, struct sockaddr_iso *sa,
1145 int addr_len)
1146 {
1147 struct hci_dev *hdev;
1148 struct hci_conn *bis;
1149 int err;
1150
1151 if (sk->sk_type != SOCK_SEQPACKET || !iso_pi(sk)->conn)
1152 return -EINVAL;
1153
1154 /* Check if it is really a Broadcast address being requested */
1155 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc))
1156 return -EINVAL;
1157
1158 /* Check if the address hasn't changed then perhaps only the number of
1159 * bis has changed.
1160 */
1161 if (!bacmp(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr) ||
1162 !bacmp(&sa->iso_bc->bc_bdaddr, BDADDR_ANY))
1163 return iso_sock_rebind_bis(sk, sa, addr_len);
1164
1165 /* Check if the address type is of LE type */
1166 if (!bdaddr_type_is_le(sa->iso_bc->bc_bdaddr_type))
1167 return -EINVAL;
1168
1169 hdev = iso_conn_get_hdev(iso_pi(sk)->conn);
1170 if (!hdev)
1171 return -EINVAL;
1172
1173 bis = iso_pi(sk)->conn->hcon;
1174
1175 /* Release the socket before lookups since that requires hci_dev_lock
1176 * which shall not be acquired while holding sock_lock for proper
1177 * ordering.
1178 */
1179 release_sock(sk);
1180 hci_dev_lock(hdev);
1181 lock_sock(sk);
1182
1183 if (!iso_pi(sk)->conn || iso_pi(sk)->conn->hcon != bis) {
1184 /* raced with iso_conn_del() or iso_disconn_sock() */
1185 err = -ENOTCONN;
1186 goto unlock;
1187 }
1188
1189 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bc->bc_bdaddr,
1190 sa->iso_bc->bc_bdaddr_type);
1191
1192 err = hci_past_bis(bis, &sa->iso_bc->bc_bdaddr,
1193 le_addr_type(sa->iso_bc->bc_bdaddr_type));
1194
1195 unlock:
1196 hci_dev_unlock(hdev);
1197 hci_dev_put(hdev);
1198
1199 return err;
1200 }
1201
iso_sock_bind(struct socket * sock,struct sockaddr_unsized * addr,int addr_len)1202 static int iso_sock_bind(struct socket *sock, struct sockaddr_unsized *addr,
1203 int addr_len)
1204 {
1205 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1206 struct sock *sk = sock->sk;
1207 int err = 0;
1208
1209 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type);
1210
1211 if (!addr || addr_len < sizeof(struct sockaddr_iso) ||
1212 addr->sa_family != AF_BLUETOOTH)
1213 return -EINVAL;
1214
1215 lock_sock(sk);
1216
1217 if ((sk->sk_state == BT_CONNECT2 || sk->sk_state == BT_CONNECTED) &&
1218 addr_len > sizeof(*sa)) {
1219 /* Allow the user to rebind to a different address using
1220 * PAST procedures.
1221 */
1222 err = iso_sock_rebind_bc(sk, sa, addr_len);
1223 goto done;
1224 }
1225
1226 if (sk->sk_state != BT_OPEN) {
1227 err = -EBADFD;
1228 goto done;
1229 }
1230
1231 if (sk->sk_type != SOCK_SEQPACKET) {
1232 err = -EINVAL;
1233 goto done;
1234 }
1235
1236 /* Check if the address type is of LE type */
1237 if (!bdaddr_type_is_le(sa->iso_bdaddr_type)) {
1238 err = -EINVAL;
1239 goto done;
1240 }
1241
1242 bacpy(&iso_pi(sk)->src, &sa->iso_bdaddr);
1243 iso_pi(sk)->src_type = sa->iso_bdaddr_type;
1244
1245 /* Check for Broadcast address */
1246 if (addr_len > sizeof(*sa)) {
1247 err = iso_sock_bind_bc(sock, addr, addr_len);
1248 if (err)
1249 goto done;
1250 }
1251
1252 sk->sk_state = BT_BOUND;
1253
1254 done:
1255 release_sock(sk);
1256 return err;
1257 }
1258
iso_sock_connect(struct socket * sock,struct sockaddr_unsized * addr,int alen,int flags)1259 static int iso_sock_connect(struct socket *sock, struct sockaddr_unsized *addr,
1260 int alen, int flags)
1261 {
1262 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1263 struct sock *sk = sock->sk;
1264 int err;
1265
1266 BT_DBG("sk %p", sk);
1267
1268 if (alen < sizeof(struct sockaddr_iso) ||
1269 addr->sa_family != AF_BLUETOOTH)
1270 return -EINVAL;
1271
1272 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
1273 return -EBADFD;
1274
1275 if (sk->sk_type != SOCK_SEQPACKET)
1276 return -EINVAL;
1277
1278 /* Check if the address type is of LE type */
1279 if (!bdaddr_type_is_le(sa->iso_bdaddr_type))
1280 return -EINVAL;
1281
1282 lock_sock(sk);
1283
1284 bacpy(&iso_pi(sk)->dst, &sa->iso_bdaddr);
1285 iso_pi(sk)->dst_type = sa->iso_bdaddr_type;
1286
1287 release_sock(sk);
1288
1289 if (bacmp(&sa->iso_bdaddr, BDADDR_ANY))
1290 err = iso_connect_cis(sk);
1291 else
1292 err = iso_connect_bis(sk);
1293
1294 if (err)
1295 return err;
1296
1297 lock_sock(sk);
1298
1299 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1300 err = bt_sock_wait_state(sk, BT_CONNECTED,
1301 sock_sndtimeo(sk, flags & O_NONBLOCK));
1302 }
1303
1304 release_sock(sk);
1305 return err;
1306 }
1307
iso_listen_bis(struct sock * sk)1308 static int iso_listen_bis(struct sock *sk)
1309 {
1310 struct iso_conn *conn;
1311 struct hci_conn *hcon;
1312 struct hci_dev *hdev;
1313 bdaddr_t src, dst;
1314 u8 src_type, bc_sid;
1315 int err = 0;
1316
1317 lock_sock(sk);
1318 bacpy(&src, &iso_pi(sk)->src);
1319 bacpy(&dst, &iso_pi(sk)->dst);
1320 src_type = iso_pi(sk)->src_type;
1321 bc_sid = iso_pi(sk)->bc_sid;
1322 release_sock(sk);
1323
1324 BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &src, &dst, bc_sid);
1325
1326 write_lock(&iso_sk_list.lock);
1327
1328 if (__iso_get_sock_listen_by_sid(&src, &dst, bc_sid))
1329 err = -EADDRINUSE;
1330
1331 write_unlock(&iso_sk_list.lock);
1332
1333 if (err)
1334 return err;
1335
1336 hdev = hci_get_route(&dst, &src, src_type);
1337 if (!hdev)
1338 return -EHOSTUNREACH;
1339
1340 hci_dev_lock(hdev);
1341 lock_sock(sk);
1342
1343 /* Fail if user set invalid QoS */
1344 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(&iso_pi(sk)->qos)) {
1345 iso_pi(sk)->qos = default_qos;
1346 err = -EINVAL;
1347 goto unlock;
1348 }
1349
1350 hcon = hci_pa_create_sync(hdev, &iso_pi(sk)->dst,
1351 le_addr_type(iso_pi(sk)->dst_type),
1352 iso_pi(sk)->bc_sid, &iso_pi(sk)->qos);
1353 if (IS_ERR(hcon)) {
1354 err = PTR_ERR(hcon);
1355 goto unlock;
1356 }
1357
1358 lockdep_assert_held(&hcon->hdev->lock);
1359
1360 conn = iso_conn_add(hcon);
1361 if (!conn) {
1362 hci_conn_drop(hcon);
1363 err = -ENOMEM;
1364 goto unlock;
1365 }
1366
1367 err = iso_chan_add(conn, sk, NULL);
1368 iso_conn_put(conn);
1369 if (err)
1370 goto unlock;
1371
1372 unlock:
1373 release_sock(sk);
1374 hci_dev_unlock(hdev);
1375 hci_dev_put(hdev);
1376 return err;
1377 }
1378
iso_listen_cis(struct sock * sk)1379 static int iso_listen_cis(struct sock *sk)
1380 {
1381 int err = 0;
1382
1383 BT_DBG("%pMR", &iso_pi(sk)->src);
1384
1385 write_lock(&iso_sk_list.lock);
1386
1387 if (__iso_get_sock_listen_by_addr(&iso_pi(sk)->src, &iso_pi(sk)->dst))
1388 err = -EADDRINUSE;
1389
1390 write_unlock(&iso_sk_list.lock);
1391
1392 return err;
1393 }
1394
iso_sock_listen(struct socket * sock,int backlog)1395 static int iso_sock_listen(struct socket *sock, int backlog)
1396 {
1397 struct sock *sk = sock->sk;
1398 int err = 0;
1399
1400 BT_DBG("sk %p backlog %d", sk, backlog);
1401
1402 sock_hold(sk);
1403 lock_sock(sk);
1404
1405 if (sk->sk_state != BT_BOUND) {
1406 err = -EBADFD;
1407 goto done;
1408 }
1409
1410 if (sk->sk_type != SOCK_SEQPACKET) {
1411 err = -EINVAL;
1412 goto done;
1413 }
1414
1415 if (!bacmp(&iso_pi(sk)->dst, BDADDR_ANY)) {
1416 err = iso_listen_cis(sk);
1417 } else {
1418 /* Drop sock lock to avoid potential
1419 * deadlock with the hdev lock.
1420 */
1421 release_sock(sk);
1422 err = iso_listen_bis(sk);
1423 lock_sock(sk);
1424 }
1425
1426 if (err)
1427 goto done;
1428
1429 sk->sk_max_ack_backlog = backlog;
1430 sk->sk_ack_backlog = 0;
1431
1432 sk->sk_state = BT_LISTEN;
1433
1434 done:
1435 release_sock(sk);
1436 sock_put(sk);
1437 return err;
1438 }
1439
iso_sock_accept(struct socket * sock,struct socket * newsock,struct proto_accept_arg * arg)1440 static int iso_sock_accept(struct socket *sock, struct socket *newsock,
1441 struct proto_accept_arg *arg)
1442 {
1443 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1444 struct sock *sk = sock->sk, *ch;
1445 long timeo;
1446 int err = 0;
1447
1448 /* Use explicit nested locking to avoid lockdep warnings generated
1449 * because the parent socket and the child socket are locked on the
1450 * same thread.
1451 */
1452 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1453
1454 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
1455
1456 BT_DBG("sk %p timeo %ld", sk, timeo);
1457
1458 /* Wait for an incoming connection. (wake-one). */
1459 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1460 while (1) {
1461 if (sk->sk_state != BT_LISTEN) {
1462 err = -EBADFD;
1463 break;
1464 }
1465
1466 ch = bt_accept_dequeue(sk, newsock);
1467 if (ch) {
1468 /* Drop the bridging ref from bt_accept_dequeue();
1469 * the grafted socket keeps ch alive from here.
1470 */
1471 sock_put(ch);
1472 break;
1473 }
1474
1475 if (!timeo) {
1476 err = -EAGAIN;
1477 break;
1478 }
1479
1480 if (signal_pending(current)) {
1481 err = sock_intr_errno(timeo);
1482 break;
1483 }
1484
1485 release_sock(sk);
1486
1487 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1488 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1489 }
1490 remove_wait_queue(sk_sleep(sk), &wait);
1491
1492 if (err)
1493 goto done;
1494
1495 newsock->state = SS_CONNECTED;
1496
1497 BT_DBG("new socket %p", ch);
1498
1499 /* A Broadcast Sink might require BIG sync to be terminated
1500 * and re-established multiple times, while keeping the same
1501 * PA sync handle active. To allow this, once all BIS
1502 * connections have been accepted on a PA sync parent socket,
1503 * "reset" socket state, to allow future BIG re-sync procedures.
1504 */
1505 if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) {
1506 /* Iterate through the list of bound BIS indices
1507 * and clear each BIS as they are accepted by the
1508 * user space, one by one.
1509 */
1510 for (int i = 0; i < iso_pi(sk)->bc_num_bis; i++) {
1511 if (iso_pi(sk)->bc_bis[i] > 0) {
1512 iso_pi(sk)->bc_bis[i] = 0;
1513 iso_pi(sk)->bc_num_bis--;
1514 break;
1515 }
1516 }
1517
1518 if (iso_pi(sk)->bc_num_bis == 0) {
1519 /* Once the last BIS was accepted, reset parent
1520 * socket parameters to mark that the listening
1521 * process for BIS connections has been completed:
1522 *
1523 * 1. Reset the DEFER setup flag on the parent sk.
1524 * 2. Clear the flag marking that the BIG create
1525 * sync command is pending.
1526 * 3. Transition socket state from BT_LISTEN to
1527 * BT_CONNECTED.
1528 */
1529 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1530 clear_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags);
1531 sk->sk_state = BT_CONNECTED;
1532 }
1533 }
1534
1535 done:
1536 release_sock(sk);
1537 return err;
1538 }
1539
iso_sock_getname(struct socket * sock,struct sockaddr * addr,int peer)1540 static int iso_sock_getname(struct socket *sock, struct sockaddr *addr,
1541 int peer)
1542 {
1543 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1544 struct sock *sk = sock->sk;
1545 int len = sizeof(struct sockaddr_iso);
1546
1547 BT_DBG("sock %p, sk %p", sock, sk);
1548
1549 lock_sock(sk);
1550
1551 memset(sa, 0, sizeof(struct sockaddr_iso));
1552 addr->sa_family = AF_BLUETOOTH;
1553
1554 if (peer) {
1555 struct hci_conn *hcon = iso_pi(sk)->conn ?
1556 iso_pi(sk)->conn->hcon : NULL;
1557
1558 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->dst);
1559 sa->iso_bdaddr_type = iso_pi(sk)->dst_type;
1560
1561 if (hcon && (hcon->type == BIS_LINK || hcon->type == PA_LINK)) {
1562 memset(sa->iso_bc, 0, sizeof(struct sockaddr_iso_bc));
1563 sa->iso_bc->bc_sid = iso_pi(sk)->bc_sid;
1564 sa->iso_bc->bc_num_bis = iso_pi(sk)->bc_num_bis;
1565 memcpy(sa->iso_bc->bc_bis, iso_pi(sk)->bc_bis,
1566 ISO_MAX_NUM_BIS);
1567 len += sizeof(struct sockaddr_iso_bc);
1568 }
1569 } else {
1570 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->src);
1571 sa->iso_bdaddr_type = iso_pi(sk)->src_type;
1572 }
1573
1574 release_sock(sk);
1575
1576 return len;
1577 }
1578
iso_sock_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)1579 static int iso_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1580 size_t len)
1581 {
1582 struct sock *sk = sock->sk;
1583 struct sk_buff *skb, **frag;
1584 struct sockcm_cookie sockc;
1585 size_t mtu;
1586 int err;
1587
1588 BT_DBG("sock %p, sk %p", sock, sk);
1589
1590 err = sock_error(sk);
1591 if (err)
1592 return err;
1593
1594 if (msg->msg_flags & MSG_OOB)
1595 return -EOPNOTSUPP;
1596
1597 hci_sockcm_init(&sockc, sk);
1598
1599 if (msg->msg_controllen) {
1600 err = sock_cmsg_send(sk, msg, &sockc);
1601 if (err)
1602 return err;
1603 }
1604
1605 lock_sock(sk);
1606
1607 if (sk->sk_state != BT_CONNECTED) {
1608 release_sock(sk);
1609 return -ENOTCONN;
1610 }
1611
1612 mtu = iso_pi(sk)->conn->hcon->mtu;
1613
1614 release_sock(sk);
1615
1616 skb = bt_skb_sendmsg(sk, msg, len, mtu, HCI_ISO_DATA_HDR_SIZE, 0);
1617 if (IS_ERR(skb))
1618 return PTR_ERR(skb);
1619
1620 len -= skb->len;
1621
1622 BT_DBG("skb %p len %d", sk, skb->len);
1623
1624 /* Continuation fragments */
1625 frag = &skb_shinfo(skb)->frag_list;
1626 while (len) {
1627 struct sk_buff *tmp;
1628
1629 tmp = bt_skb_sendmsg(sk, msg, len, mtu, 0, 0);
1630 if (IS_ERR(tmp)) {
1631 kfree_skb(skb);
1632 return PTR_ERR(tmp);
1633 }
1634
1635 *frag = tmp;
1636
1637 len -= tmp->len;
1638
1639 skb->len += tmp->len;
1640 skb->data_len += tmp->len;
1641
1642 BT_DBG("frag %p len %d", *frag, tmp->len);
1643
1644 frag = &(*frag)->next;
1645 }
1646
1647 lock_sock(sk);
1648
1649 if (sk->sk_state == BT_CONNECTED)
1650 err = iso_send_frame(sk, skb, &sockc);
1651 else
1652 err = -ENOTCONN;
1653
1654 release_sock(sk);
1655
1656 if (err < 0)
1657 kfree_skb(skb);
1658 return err;
1659 }
1660
iso_conn_defer_accept(struct hci_conn * conn)1661 static void iso_conn_defer_accept(struct hci_conn *conn)
1662 {
1663 struct hci_cp_le_accept_cis cp;
1664 struct hci_dev *hdev = conn->hdev;
1665
1666 BT_DBG("conn %p", conn);
1667
1668 conn->state = BT_CONFIG;
1669
1670 cp.handle = cpu_to_le16(conn->handle);
1671
1672 hci_send_cmd(hdev, HCI_OP_LE_ACCEPT_CIS, sizeof(cp), &cp);
1673 }
1674
iso_conn_big_sync(struct sock * sk)1675 static int iso_conn_big_sync(struct sock *sk)
1676 {
1677 int err = 0;
1678 struct hci_dev *hdev;
1679 struct iso_conn *conn;
1680 bdaddr_t src, dst;
1681 u8 src_type;
1682
1683 lock_sock(sk);
1684 bacpy(&src, &iso_pi(sk)->src);
1685 bacpy(&dst, &iso_pi(sk)->dst);
1686 src_type = iso_pi(sk)->src_type;
1687 release_sock(sk);
1688
1689 hdev = hci_get_route(&dst, &src, src_type);
1690
1691 if (!hdev)
1692 return -EHOSTUNREACH;
1693
1694 /* hci_le_big_create_sync requires hdev lock to be held, since
1695 * it enqueues the HCI LE BIG Create Sync command via
1696 * hci_cmd_sync_queue_once, which checks hdev flags that might
1697 * change.
1698 */
1699 hci_dev_lock(hdev);
1700 lock_sock(sk);
1701
1702 /* The socket lock was dropped for hci_get_route(), so the connection
1703 * may have been torn down meanwhile: iso_chan_del() clears conn and
1704 * the broadcast teardown path can clear conn->hcon on its own. Check
1705 * both before dereferencing conn->hcon.
1706 */
1707 conn = iso_pi(sk)->conn;
1708 if (!conn || !conn->hcon) {
1709 err = -ENOTCONN;
1710 goto unlock;
1711 }
1712
1713 if (!test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags)) {
1714 err = hci_conn_big_create_sync(hdev, conn->hcon,
1715 &iso_pi(sk)->qos,
1716 iso_pi(sk)->sync_handle,
1717 iso_pi(sk)->bc_num_bis,
1718 iso_pi(sk)->bc_bis);
1719 if (err)
1720 bt_dev_err(hdev, "hci_big_create_sync: %d", err);
1721 }
1722
1723 unlock:
1724 release_sock(sk);
1725 hci_dev_unlock(hdev);
1726 hci_dev_put(hdev);
1727
1728 return err;
1729 }
1730
iso_sock_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)1731 static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1732 size_t len, int flags)
1733 {
1734 struct sock *sk = sock->sk;
1735 struct iso_pinfo *pi = iso_pi(sk);
1736 bool early_ret = false;
1737 int err = 0;
1738
1739 BT_DBG("sk %p", sk);
1740
1741 if (unlikely(flags & MSG_ERRQUEUE))
1742 return sock_recv_errqueue(sk, msg, len, SOL_BLUETOOTH,
1743 BT_SCM_ERROR);
1744
1745 if (test_and_clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1746 sock_hold(sk);
1747 lock_sock(sk);
1748
1749 switch (sk->sk_state) {
1750 case BT_CONNECT2:
1751 if (test_bit(BT_SK_PA_SYNC, &pi->flags)) {
1752 /* Move to BT_LISTEN before requesting the BIG
1753 * sync: the BIS connections are matched to a
1754 * parent socket in BT_LISTEN state, and they
1755 * may be notified before the request returns.
1756 */
1757 sk->sk_state = BT_LISTEN;
1758
1759 release_sock(sk);
1760 err = iso_conn_big_sync(sk);
1761 lock_sock(sk);
1762
1763 /* The socket lock was dropped, so the
1764 * connection may have been torn down
1765 * meanwhile and iso_chan_del() may have
1766 * already moved the socket to BT_CLOSED.
1767 * Only move back if the BIG sync could not be
1768 * started and nothing else has changed the
1769 * state.
1770 */
1771 if (err && sk->sk_state == BT_LISTEN) {
1772 /* Discard any child socket that may
1773 * have been queued while the socket
1774 * was in BT_LISTEN, as the cleanup of
1775 * BT_CONNECT2 doesn't drain the
1776 * accept queue.
1777 */
1778 iso_sock_flush_accept_q(sk);
1779 sk->sk_state = BT_CONNECT2;
1780 }
1781 } else {
1782 iso_conn_defer_accept(pi->conn->hcon);
1783 sk->sk_state = BT_CONFIG;
1784 }
1785
1786 early_ret = true;
1787 break;
1788 case BT_CONNECTED:
1789 if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) {
1790 /* As above, the BIS connections may be
1791 * notified before the request returns.
1792 */
1793 sk->sk_state = BT_LISTEN;
1794
1795 release_sock(sk);
1796 err = iso_conn_big_sync(sk);
1797 lock_sock(sk);
1798
1799 if (err && sk->sk_state == BT_LISTEN) {
1800 /* As above, don't leave any child
1801 * socket behind in the accept queue.
1802 */
1803 iso_sock_flush_accept_q(sk);
1804 sk->sk_state = BT_CONNECTED;
1805 }
1806 early_ret = true;
1807 }
1808
1809 break;
1810 case BT_CONNECT:
1811 release_sock(sk);
1812 err = iso_connect_cis(sk);
1813 lock_sock(sk);
1814
1815 early_ret = true;
1816 break;
1817 default:
1818 break;
1819 }
1820
1821 release_sock(sk);
1822 sock_put(sk);
1823
1824 if (early_ret)
1825 return err;
1826 }
1827
1828 return bt_sock_recvmsg(sock, msg, len, flags);
1829 }
1830
check_io_qos(struct bt_iso_io_qos * qos)1831 static bool check_io_qos(struct bt_iso_io_qos *qos)
1832 {
1833 /* If no PHY is enable SDU must be 0 */
1834 if (!qos->phys && qos->sdu)
1835 return false;
1836
1837 if (qos->interval && (qos->interval < 0xff || qos->interval > 0xfffff))
1838 return false;
1839
1840 if (qos->latency && (qos->latency < 0x05 || qos->latency > 0xfa0))
1841 return false;
1842
1843 if (qos->phys > BT_ISO_PHY_ANY)
1844 return false;
1845
1846 return true;
1847 }
1848
check_ucast_qos(struct bt_iso_qos * qos)1849 static bool check_ucast_qos(struct bt_iso_qos *qos)
1850 {
1851 if (qos->ucast.cig > 0xef && qos->ucast.cig != BT_ISO_QOS_CIG_UNSET)
1852 return false;
1853
1854 if (qos->ucast.cis > 0xef && qos->ucast.cis != BT_ISO_QOS_CIS_UNSET)
1855 return false;
1856
1857 if (qos->ucast.sca > 0x07)
1858 return false;
1859
1860 if (qos->ucast.packing > 0x01)
1861 return false;
1862
1863 if (qos->ucast.framing > 0x01)
1864 return false;
1865
1866 if (!check_io_qos(&qos->ucast.in))
1867 return false;
1868
1869 if (!check_io_qos(&qos->ucast.out))
1870 return false;
1871
1872 return true;
1873 }
1874
check_bcast_qos(struct bt_iso_qos * qos)1875 static bool check_bcast_qos(struct bt_iso_qos *qos)
1876 {
1877 if (!qos->bcast.sync_factor)
1878 qos->bcast.sync_factor = 0x01;
1879
1880 if (qos->bcast.packing > 0x01)
1881 return false;
1882
1883 if (qos->bcast.framing > 0x01)
1884 return false;
1885
1886 if (!check_io_qos(&qos->bcast.in))
1887 return false;
1888
1889 if (!check_io_qos(&qos->bcast.out))
1890 return false;
1891
1892 if (qos->bcast.encryption > 0x01)
1893 return false;
1894
1895 if (qos->bcast.options > 0x07)
1896 return false;
1897
1898 if (qos->bcast.skip > 0x01f3)
1899 return false;
1900
1901 if (!qos->bcast.sync_timeout)
1902 qos->bcast.sync_timeout = BT_ISO_SYNC_TIMEOUT;
1903
1904 if (qos->bcast.sync_timeout < 0x000a || qos->bcast.sync_timeout > 0x4000)
1905 return false;
1906
1907 if (qos->bcast.sync_cte_type > 0x1f)
1908 return false;
1909
1910 if (qos->bcast.mse > 0x1f)
1911 return false;
1912
1913 if (!qos->bcast.timeout)
1914 qos->bcast.timeout = BT_ISO_SYNC_TIMEOUT;
1915
1916 if (qos->bcast.timeout < 0x000a || qos->bcast.timeout > 0x4000)
1917 return false;
1918
1919 return true;
1920 }
1921
iso_sock_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)1922 static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
1923 sockptr_t optval, unsigned int optlen)
1924 {
1925 struct sock *sk = sock->sk;
1926 int err = 0;
1927 struct bt_iso_qos qos = default_qos;
1928 u32 opt;
1929
1930 BT_DBG("sk %p", sk);
1931
1932 lock_sock(sk);
1933
1934 switch (optname) {
1935 case BT_DEFER_SETUP:
1936 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1937 err = -EINVAL;
1938 break;
1939 }
1940
1941 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
1942 if (err)
1943 break;
1944
1945 if (opt)
1946 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1947 else
1948 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1949 break;
1950
1951 case BT_PKT_STATUS:
1952 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
1953 if (err)
1954 break;
1955
1956 if (opt)
1957 set_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
1958 else
1959 clear_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
1960 break;
1961
1962 case BT_PKT_SEQNUM:
1963 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen);
1964 if (err)
1965 break;
1966
1967 if (opt)
1968 set_bit(BT_SK_PKT_SEQNUM, &bt_sk(sk)->flags);
1969 else
1970 clear_bit(BT_SK_PKT_SEQNUM, &bt_sk(sk)->flags);
1971 break;
1972
1973 case BT_ISO_QOS:
1974 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1975 sk->sk_state != BT_CONNECT2 &&
1976 (!test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags) ||
1977 sk->sk_state != BT_CONNECTED)) {
1978 err = -EINVAL;
1979 break;
1980 }
1981
1982 err = copy_safe_from_sockptr(&qos, sizeof(qos), optval, optlen);
1983 if (err)
1984 break;
1985
1986 iso_pi(sk)->qos = qos;
1987 iso_pi(sk)->qos_user_set = true;
1988
1989 break;
1990
1991 case BT_ISO_BASE:
1992 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1993 sk->sk_state != BT_CONNECT2) {
1994 err = -EINVAL;
1995 break;
1996 }
1997
1998 if (optlen > sizeof(iso_pi(sk)->base)) {
1999 err = -EINVAL;
2000 break;
2001 }
2002
2003 err = copy_safe_from_sockptr(iso_pi(sk)->base, optlen, optval,
2004 optlen);
2005 if (err)
2006 break;
2007
2008 iso_pi(sk)->base_len = optlen;
2009
2010 break;
2011
2012 default:
2013 err = -ENOPROTOOPT;
2014 break;
2015 }
2016
2017 release_sock(sk);
2018 return err;
2019 }
2020
iso_sock_getsockopt(struct socket * sock,int level,int optname,sockopt_t * opt)2021 static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
2022 sockopt_t *opt)
2023 {
2024 struct sock *sk = sock->sk;
2025 struct bt_iso_qos *qos;
2026 int len, val, err = 0;
2027 u8 base_len;
2028 u8 *base;
2029
2030 BT_DBG("sk %p", sk);
2031
2032 len = opt->optlen;
2033
2034 lock_sock(sk);
2035
2036 switch (optname) {
2037 case BT_DEFER_SETUP:
2038 if (sk->sk_state == BT_CONNECTED) {
2039 err = -EINVAL;
2040 break;
2041 }
2042
2043 val = test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
2044 if (copy_to_iter(&val, sizeof(val), &opt->iter_out) !=
2045 sizeof(val))
2046 err = -EFAULT;
2047
2048 break;
2049
2050 case BT_PKT_STATUS:
2051 val = test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
2052 if (copy_to_iter(&val, sizeof(val), &opt->iter_out) !=
2053 sizeof(val))
2054 err = -EFAULT;
2055 break;
2056
2057 case BT_ISO_QOS:
2058 qos = iso_sock_get_qos(sk);
2059
2060 len = min_t(unsigned int, len, sizeof(*qos));
2061 if (copy_to_iter(qos, len, &opt->iter_out) != len)
2062 err = -EFAULT;
2063
2064 break;
2065
2066 case BT_ISO_BASE:
2067 if (sk->sk_state == BT_CONNECTED &&
2068 !bacmp(&iso_pi(sk)->dst, BDADDR_ANY)) {
2069 base_len = iso_pi(sk)->conn->hcon->le_per_adv_data_len;
2070 base = iso_pi(sk)->conn->hcon->le_per_adv_data;
2071 } else {
2072 base_len = iso_pi(sk)->base_len;
2073 base = iso_pi(sk)->base;
2074 }
2075
2076 len = min_t(unsigned int, len, base_len);
2077 opt->optlen = len;
2078 if (copy_to_iter(base, len, &opt->iter_out) != len)
2079 err = -EFAULT;
2080
2081 break;
2082
2083 default:
2084 err = -ENOPROTOOPT;
2085 break;
2086 }
2087
2088 release_sock(sk);
2089 return err;
2090 }
2091
iso_sock_shutdown(struct socket * sock,int how)2092 static int iso_sock_shutdown(struct socket *sock, int how)
2093 {
2094 struct sock *sk = sock->sk;
2095 int err = 0;
2096
2097 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
2098
2099 if (!sk)
2100 return 0;
2101
2102 sock_hold(sk);
2103 lock_sock(sk);
2104
2105 switch (how) {
2106 case SHUT_RD:
2107 if (sk->sk_shutdown & RCV_SHUTDOWN)
2108 goto unlock;
2109 sk->sk_shutdown |= RCV_SHUTDOWN;
2110 break;
2111 case SHUT_WR:
2112 if (sk->sk_shutdown & SEND_SHUTDOWN)
2113 goto unlock;
2114 sk->sk_shutdown |= SEND_SHUTDOWN;
2115 break;
2116 case SHUT_RDWR:
2117 if (sk->sk_shutdown & SHUTDOWN_MASK)
2118 goto unlock;
2119 sk->sk_shutdown |= SHUTDOWN_MASK;
2120 break;
2121 }
2122
2123 iso_sock_clear_timer(sk);
2124 __iso_sock_close(sk);
2125
2126 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
2127 !(current->flags & PF_EXITING))
2128 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
2129
2130 unlock:
2131 release_sock(sk);
2132 sock_put(sk);
2133
2134 return err;
2135 }
2136
iso_sock_release(struct socket * sock)2137 static int iso_sock_release(struct socket *sock)
2138 {
2139 struct sock *sk = sock->sk;
2140 int err = 0;
2141
2142 BT_DBG("sock %p, sk %p", sock, sk);
2143
2144 if (!sk)
2145 return 0;
2146
2147 iso_sock_close(sk);
2148
2149 if (sock_flag(sk, SOCK_LINGER) && READ_ONCE(sk->sk_lingertime) &&
2150 !(current->flags & PF_EXITING)) {
2151 lock_sock(sk);
2152 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
2153 release_sock(sk);
2154 }
2155
2156 /* Make sure sk is valid even if iso_conn_del() is concurrent */
2157 sock_hold(sk);
2158
2159 lock_sock(sk);
2160 sock_orphan(sk);
2161 release_sock(sk);
2162
2163 iso_sock_kill(sk);
2164
2165 sock_put(sk);
2166 return err;
2167 }
2168
iso_sock_ready(struct sock * sk)2169 static void iso_sock_ready(struct sock *sk)
2170 {
2171 BT_DBG("sk %p", sk);
2172
2173 lockdep_assert(lockdep_sock_is_held(sk));
2174
2175 switch (sk->sk_state) {
2176 case BT_DISCONN:
2177 case BT_CLOSED:
2178 return;
2179 }
2180
2181 iso_sock_clear_timer(sk);
2182 sk->sk_state = BT_CONNECTED;
2183 sk->sk_state_change(sk);
2184 }
2185
iso_match_big(struct sock * sk,void * data)2186 static bool iso_match_big(struct sock *sk, void *data)
2187 {
2188 struct hci_evt_le_big_sync_established *ev = data;
2189
2190 return ev->handle == iso_pi(sk)->qos.bcast.big;
2191 }
2192
iso_match_big_hcon(struct sock * sk,void * data)2193 static bool iso_match_big_hcon(struct sock *sk, void *data)
2194 {
2195 struct hci_conn *hcon = data;
2196
2197 return hcon->iso_qos.bcast.big == iso_pi(sk)->qos.bcast.big;
2198 }
2199
iso_match_pa_sync_flag(struct sock * sk,void * data)2200 static bool iso_match_pa_sync_flag(struct sock *sk, void *data)
2201 {
2202 return test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags);
2203 }
2204
iso_match_dst(struct sock * sk,void * data)2205 static bool iso_match_dst(struct sock *sk, void *data)
2206 {
2207 return !bacmp(&iso_pi(sk)->dst, (bdaddr_t *)data);
2208 }
2209
iso_conn_ready(struct iso_conn * conn)2210 static void iso_conn_ready(struct iso_conn *conn)
2211 {
2212 struct sock *parent = NULL;
2213 struct sock *sk;
2214 struct hci_ev_le_big_sync_established *ev = NULL;
2215 struct hci_ev_le_pa_sync_established *ev2 = NULL;
2216 struct hci_ev_le_per_adv_report *ev3 = NULL;
2217 struct hci_conn *hcon;
2218 struct hci_dev *hdev;
2219
2220 BT_DBG("conn %p", conn);
2221
2222 iso_conn_lock(conn);
2223 sk = iso_sock_hold(conn);
2224 iso_conn_unlock(conn);
2225
2226 if (sk) {
2227 lock_sock(sk);
2228
2229 /* conn->sk may have become NULL if racing with sk close, but
2230 * due to held hdev->lock, it can't become different sk.
2231 */
2232 if (!conn->sk) {
2233 release_sock(sk);
2234 sock_put(sk);
2235 return;
2236 }
2237
2238 /* Attempt to update source address in case of BIS Sender if
2239 * the advertisement is using a random address.
2240 */
2241 if (conn->hcon->type == BIS_LINK &&
2242 conn->hcon->role == HCI_ROLE_MASTER &&
2243 !bacmp(&conn->hcon->dst, BDADDR_ANY)) {
2244 struct hci_conn *bis = conn->hcon;
2245 struct adv_info *adv;
2246
2247 adv = hci_find_adv_instance(bis->hdev,
2248 bis->iso_qos.bcast.bis);
2249 if (adv && bacmp(&adv->random_addr, BDADDR_ANY)) {
2250 iso_pi(sk)->src_type = BDADDR_LE_RANDOM;
2251 bacpy(&iso_pi(sk)->src, &adv->random_addr);
2252 }
2253 }
2254
2255 iso_sock_ready(sk);
2256
2257 release_sock(sk);
2258 sock_put(sk);
2259 } else {
2260 hcon = conn->hcon;
2261 if (!hcon)
2262 return;
2263
2264 hdev = hcon->hdev;
2265
2266 if (test_bit(HCI_CONN_BIG_SYNC, &hcon->flags)) {
2267 /* A BIS slave hcon is notified to the ISO layer
2268 * after the Command Complete for the LE Setup
2269 * ISO Data Path command is received. Get the
2270 * parent socket that matches the hcon BIG handle.
2271 */
2272 parent = iso_get_sock(hdev, &hcon->src, &hcon->dst,
2273 BT_LISTEN, iso_match_big_hcon,
2274 hcon);
2275 } else if (test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags)) {
2276 ev = hci_recv_event_data(hcon->hdev,
2277 HCI_EVT_LE_BIG_SYNC_ESTABLISHED);
2278
2279 /* Get reference to PA sync parent socket, if it exists */
2280 parent = iso_get_sock(hdev, &hcon->src, &hcon->dst,
2281 BT_LISTEN,
2282 iso_match_pa_sync_flag,
2283 NULL);
2284 if (!parent && ev)
2285 parent = iso_get_sock(hdev, &hcon->src,
2286 &hcon->dst,
2287 BT_LISTEN,
2288 iso_match_big, ev);
2289 } else if (test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
2290 ev2 = hci_recv_event_data(hcon->hdev,
2291 HCI_EV_LE_PA_SYNC_ESTABLISHED);
2292 if (ev2)
2293 parent = iso_get_sock(hdev, &hcon->src,
2294 &hcon->dst,
2295 BT_LISTEN,
2296 iso_match_sid, ev2);
2297 } else if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) {
2298 ev3 = hci_recv_event_data(hcon->hdev,
2299 HCI_EV_LE_PER_ADV_REPORT);
2300 if (ev3)
2301 parent = iso_get_sock(hdev, &hcon->src,
2302 &hcon->dst,
2303 BT_LISTEN,
2304 iso_match_sync_handle_pa_report,
2305 ev3);
2306 }
2307
2308 if (!parent)
2309 parent = iso_get_sock(hdev, &hcon->src, BDADDR_ANY,
2310 BT_LISTEN, iso_match_dst, BDADDR_ANY);
2311
2312 if (!parent)
2313 return;
2314
2315 lock_sock(parent);
2316
2317 /* The listener may have been closed concurrently. */
2318 if (parent->sk_state != BT_LISTEN ||
2319 sock_flag(parent, SOCK_ZAPPED)) {
2320 release_sock(parent);
2321 sock_put(parent);
2322 return;
2323 }
2324
2325 sk = iso_sock_alloc(sock_net(parent), NULL,
2326 BTPROTO_ISO, GFP_ATOMIC, 0);
2327 if (!sk) {
2328 release_sock(parent);
2329 sock_put(parent);
2330 return;
2331 }
2332
2333 iso_sock_init(sk, parent);
2334
2335 bacpy(&iso_pi(sk)->src, &hcon->src);
2336
2337 /* Convert from HCI to three-value type */
2338 if (hcon->src_type == ADDR_LE_DEV_PUBLIC)
2339 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
2340 else
2341 iso_pi(sk)->src_type = BDADDR_LE_RANDOM;
2342
2343 /* If hcon has no destination address (BDADDR_ANY) it means it
2344 * was created by HCI_EV_LE_BIG_SYNC_ESTABILISHED or
2345 * HCI_EV_LE_PA_SYNC_ESTABLISHED so we need to initialize using
2346 * the parent socket destination address.
2347 */
2348 if (!bacmp(&hcon->dst, BDADDR_ANY)) {
2349 bacpy(&hcon->dst, &iso_pi(parent)->dst);
2350 hcon->dst_type = le_addr_type(iso_pi(parent)->dst_type);
2351 }
2352
2353 if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) {
2354 iso_pi(sk)->qos = iso_pi(parent)->qos;
2355 hcon->iso_qos = iso_pi(sk)->qos;
2356 iso_pi(sk)->bc_sid = iso_pi(parent)->bc_sid;
2357 iso_pi(sk)->bc_num_bis = iso_pi(parent)->bc_num_bis;
2358 memcpy(iso_pi(sk)->bc_bis, iso_pi(parent)->bc_bis,
2359 ISO_MAX_NUM_BIS);
2360 set_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags);
2361 }
2362
2363 bacpy(&iso_pi(sk)->dst, &hcon->dst);
2364
2365 /* Convert from HCI to three-value type */
2366 if (hcon->dst_type == ADDR_LE_DEV_PUBLIC)
2367 iso_pi(sk)->dst_type = BDADDR_LE_PUBLIC;
2368 else
2369 iso_pi(sk)->dst_type = BDADDR_LE_RANDOM;
2370
2371 iso_pi(sk)->sync_handle = iso_pi(parent)->sync_handle;
2372 memcpy(iso_pi(sk)->base, iso_pi(parent)->base, iso_pi(parent)->base_len);
2373 iso_pi(sk)->base_len = iso_pi(parent)->base_len;
2374
2375 hci_conn_hold(hcon);
2376 iso_chan_add(conn, sk, parent);
2377
2378 if ((ev && ((struct hci_evt_le_big_sync_established *)ev)->status) ||
2379 (ev2 && ev2->status)) {
2380 /* Trigger error signal on child socket */
2381 sk->sk_err = ECONNREFUSED;
2382 sk->sk_error_report(sk);
2383 }
2384
2385 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
2386 sk->sk_state = BT_CONNECT2;
2387 else
2388 sk->sk_state = BT_CONNECTED;
2389
2390 /* Wake up parent */
2391 parent->sk_data_ready(parent);
2392
2393 release_sock(parent);
2394 sock_put(parent);
2395 }
2396 }
2397
iso_match_sid(struct sock * sk,void * data)2398 static bool iso_match_sid(struct sock *sk, void *data)
2399 {
2400 struct hci_ev_le_pa_sync_established *ev = data;
2401
2402 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID)
2403 return true;
2404
2405 return ev->sid == iso_pi(sk)->bc_sid;
2406 }
2407
iso_match_sid_past(struct sock * sk,void * data)2408 static bool iso_match_sid_past(struct sock *sk, void *data)
2409 {
2410 struct hci_ev_le_past_received *ev = data;
2411
2412 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID)
2413 return true;
2414
2415 return ev->sid == iso_pi(sk)->bc_sid;
2416 }
2417
iso_match_sync_handle(struct sock * sk,void * data)2418 static bool iso_match_sync_handle(struct sock *sk, void *data)
2419 {
2420 struct hci_evt_le_big_info_adv_report *ev = data;
2421
2422 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
2423 }
2424
iso_match_sync_handle_pa_report(struct sock * sk,void * data)2425 static bool iso_match_sync_handle_pa_report(struct sock *sk, void *data)
2426 {
2427 struct hci_ev_le_per_adv_report *ev = data;
2428
2429 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
2430 }
2431
2432 /* ----- ISO interface with lower layer (HCI) ----- */
2433
iso_connect_ind(struct hci_dev * hdev,bdaddr_t * bdaddr,__u8 * flags)2434 int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
2435 {
2436 struct hci_ev_le_pa_sync_established *ev1;
2437 struct hci_ev_le_past_received *ev1a;
2438 struct hci_evt_le_big_info_adv_report *ev2;
2439 struct hci_ev_le_per_adv_report *ev3;
2440 struct sock *sk;
2441
2442 bt_dev_dbg(hdev, "bdaddr %pMR", bdaddr);
2443
2444 /* Broadcast receiver requires handling of some events before it can
2445 * proceed to establishing a BIG sync:
2446 *
2447 * 1. HCI_EV_LE_PA_SYNC_ESTABLISHED: The socket may specify a specific
2448 * SID to listen to and once sync is established its handle needs to
2449 * be stored in iso_pi(sk)->sync_handle so it can be matched once
2450 * receiving the BIG Info.
2451 * 1a. HCI_EV_LE_PAST_RECEIVED: alternative to 1.
2452 * 2. HCI_EVT_LE_BIG_INFO_ADV_REPORT: When connect_ind is triggered by a
2453 * a BIG Info it attempts to check if there any listening socket with
2454 * the same sync_handle and if it does then attempt to create a sync.
2455 * 3. HCI_EV_LE_PER_ADV_REPORT: When a PA report is received, it is stored
2456 * in iso_pi(sk)->base so it can be passed up to user, in the case of a
2457 * broadcast sink.
2458 */
2459 ev1 = hci_recv_event_data(hdev, HCI_EV_LE_PA_SYNC_ESTABLISHED);
2460 if (ev1) {
2461 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN,
2462 iso_match_sid, ev1);
2463 if (sk && !ev1->status) {
2464 lock_sock(sk);
2465 iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);
2466 iso_pi(sk)->bc_sid = ev1->sid;
2467 release_sock(sk);
2468 }
2469
2470 goto done;
2471 }
2472
2473 ev1a = hci_recv_event_data(hdev, HCI_EV_LE_PAST_RECEIVED);
2474 if (ev1a) {
2475 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN,
2476 iso_match_sid_past, ev1a);
2477 if (sk && !ev1a->status) {
2478 lock_sock(sk);
2479 iso_pi(sk)->sync_handle = le16_to_cpu(ev1a->sync_handle);
2480 iso_pi(sk)->bc_sid = ev1a->sid;
2481 release_sock(sk);
2482 }
2483
2484 goto done;
2485 }
2486
2487 ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT);
2488 if (ev2) {
2489 /* Check if BIGInfo report has already been handled */
2490 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_CONNECTED,
2491 iso_match_sync_handle, ev2);
2492 if (sk) {
2493 sock_put(sk);
2494 sk = NULL;
2495 goto done;
2496 }
2497
2498 /* Try to get PA sync socket, if it exists */
2499 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_CONNECT2,
2500 iso_match_sync_handle, ev2);
2501 if (!sk)
2502 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr,
2503 BT_LISTEN,
2504 iso_match_sync_handle,
2505 ev2);
2506
2507 if (sk) {
2508 int err = 0;
2509 bool big_sync;
2510 struct hci_conn *hcon;
2511
2512 lock_sock(sk);
2513
2514 hcon = iso_pi(sk)->conn ? iso_pi(sk)->conn->hcon : NULL;
2515 iso_pi(sk)->qos.bcast.encryption = ev2->encryption;
2516
2517 if (ev2->num_bis < iso_pi(sk)->bc_num_bis)
2518 iso_pi(sk)->bc_num_bis = ev2->num_bis;
2519
2520 big_sync = !test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags) &&
2521 !test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags);
2522
2523 if (big_sync)
2524 err = hci_conn_big_create_sync(hdev, hcon,
2525 &iso_pi(sk)->qos,
2526 iso_pi(sk)->sync_handle,
2527 iso_pi(sk)->bc_num_bis,
2528 iso_pi(sk)->bc_bis);
2529
2530 release_sock(sk);
2531
2532 if (big_sync && err) {
2533 bt_dev_err(hdev, "hci_le_big_create_sync: %d",
2534 err);
2535 sock_put(sk);
2536 sk = NULL;
2537 }
2538 }
2539
2540 goto done;
2541 }
2542
2543 ev3 = hci_recv_event_data(hdev, HCI_EV_LE_PER_ADV_REPORT);
2544 if (ev3) {
2545 size_t base_len = 0;
2546 u8 *base;
2547 struct hci_conn *hcon;
2548
2549 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN,
2550 iso_match_sync_handle_pa_report, ev3);
2551 if (!sk)
2552 goto done;
2553
2554 lock_sock(sk);
2555
2556 hcon = iso_pi(sk)->conn ? iso_pi(sk)->conn->hcon : NULL;
2557 if (!hcon)
2558 goto release3;
2559
2560 if (ev3->data_status == LE_PA_DATA_TRUNCATED) {
2561 /* The controller was unable to retrieve PA data. */
2562 memset(hcon->le_per_adv_data, 0,
2563 HCI_MAX_PER_AD_TOT_LEN);
2564 hcon->le_per_adv_data_len = 0;
2565 hcon->le_per_adv_data_offset = 0;
2566 goto release3;
2567 }
2568
2569 if (hcon->le_per_adv_data_offset + ev3->length >
2570 HCI_MAX_PER_AD_TOT_LEN)
2571 goto release3;
2572
2573 memcpy(hcon->le_per_adv_data + hcon->le_per_adv_data_offset,
2574 ev3->data, ev3->length);
2575 hcon->le_per_adv_data_offset += ev3->length;
2576
2577 if (ev3->data_status == LE_PA_DATA_COMPLETE) {
2578 /* All PA data has been received. */
2579 hcon->le_per_adv_data_len =
2580 hcon->le_per_adv_data_offset;
2581 hcon->le_per_adv_data_offset = 0;
2582
2583 /* Extract BASE */
2584 base = eir_get_service_data(hcon->le_per_adv_data,
2585 hcon->le_per_adv_data_len,
2586 EIR_BAA_SERVICE_UUID,
2587 &base_len);
2588
2589 if (!base || base_len > BASE_MAX_LENGTH)
2590 goto release3;
2591
2592 memcpy(iso_pi(sk)->base, base, base_len);
2593 iso_pi(sk)->base_len = base_len;
2594 } else {
2595 /* This is a PA data fragment. Keep pa_data_len set to 0
2596 * until all data has been reassembled.
2597 */
2598 hcon->le_per_adv_data_len = 0;
2599 }
2600
2601 release3:
2602 release_sock(sk);
2603 } else {
2604 sk = iso_get_sock(hdev, &hdev->bdaddr, BDADDR_ANY,
2605 BT_LISTEN, iso_match_dst, BDADDR_ANY);
2606 }
2607
2608 done:
2609 if (!sk)
2610 return 0;
2611
2612 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
2613 *flags |= HCI_PROTO_DEFER;
2614
2615 sock_put(sk);
2616
2617 return HCI_LM_ACCEPT;
2618 }
2619
iso_connect_cfm(struct hci_conn * hcon,__u8 status)2620 static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
2621 __must_hold(&hcon->hdev->lock)
2622 {
2623 if (hcon->type != CIS_LINK && hcon->type != BIS_LINK &&
2624 hcon->type != PA_LINK) {
2625 if (hcon->type != LE_LINK)
2626 return;
2627
2628 /* Check if LE link has failed */
2629 if (status) {
2630 struct hci_link *link, *t;
2631
2632 list_for_each_entry_safe(link, t, &hcon->link_list,
2633 list) {
2634 lockdep_assert_held(&link->conn->hdev->lock);
2635 iso_conn_del(link->conn, bt_to_errno(status));
2636 }
2637
2638 return;
2639 }
2640
2641 /* Create CIS if pending */
2642 hci_le_create_cis_pending(hcon->hdev);
2643 return;
2644 }
2645
2646 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
2647
2648 /* Similar to the success case, if HCI_CONN_BIG_SYNC_FAILED or
2649 * HCI_CONN_PA_SYNC_FAILED is set, queue the failed connection
2650 * into the accept queue of the listening socket and wake up
2651 * userspace, to inform the user about the event.
2652 */
2653 if (!status || test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags) ||
2654 test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) {
2655 struct iso_conn *conn;
2656
2657 conn = iso_conn_add(hcon);
2658 if (conn) {
2659 iso_conn_ready(conn);
2660 iso_conn_put(conn);
2661 }
2662 } else {
2663 iso_conn_del(hcon, bt_to_errno(status));
2664 }
2665 }
2666
iso_disconn_cfm(struct hci_conn * hcon,__u8 reason)2667 static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
2668 __must_hold(&hcon->hdev->lock)
2669 {
2670 if (hcon->type != CIS_LINK && hcon->type != BIS_LINK &&
2671 hcon->type != PA_LINK)
2672 return;
2673
2674 BT_DBG("hcon %p reason %d", hcon, reason);
2675
2676 iso_conn_del(hcon, bt_to_errno(reason));
2677 }
2678
iso_recv(struct hci_dev * hdev,u16 handle,struct sk_buff * skb,u16 flags)2679 int iso_recv(struct hci_dev *hdev, u16 handle, struct sk_buff *skb, u16 flags)
2680 {
2681 struct hci_conn *hcon;
2682 struct iso_conn *conn;
2683 struct skb_shared_hwtstamps *hwts;
2684 __u16 pb, ts, len, sn;
2685
2686 hci_dev_lock(hdev);
2687
2688 hcon = hci_conn_hash_lookup_handle(hdev, handle);
2689 if (!hcon) {
2690 hci_dev_unlock(hdev);
2691 kfree_skb(skb);
2692 return -ENOENT;
2693 }
2694
2695 spin_lock(&hcon->proto_lock);
2696 conn = iso_conn_hold_unless_zero(hcon->iso_data);
2697 spin_unlock(&hcon->proto_lock);
2698
2699 hcon = NULL;
2700
2701 hci_dev_unlock(hdev);
2702
2703 if (!conn) {
2704 kfree_skb(skb);
2705 return -EINVAL;
2706 }
2707
2708 pb = hci_iso_flags_pb(flags);
2709 ts = hci_iso_flags_ts(flags);
2710
2711 BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);
2712
2713 switch (pb) {
2714 case ISO_START:
2715 case ISO_SINGLE:
2716 if (conn->rx_skb || conn->rx_len) {
2717 BT_ERR("Unexpected start frame (len %d)", skb->len);
2718 kfree_skb(conn->rx_skb);
2719 conn->rx_skb = NULL;
2720 conn->rx_len = 0;
2721 }
2722
2723 if (ts) {
2724 struct hci_iso_ts_data_hdr *hdr;
2725
2726 hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
2727 if (!hdr) {
2728 BT_ERR("Frame is too short (len %d)", skb->len);
2729 goto drop;
2730 }
2731
2732 /* Record the timestamp to skb */
2733 hwts = skb_hwtstamps(skb);
2734 hwts->hwtstamp = us_to_ktime(le32_to_cpu(hdr->ts));
2735
2736 sn = __le16_to_cpu(hdr->sn);
2737 len = __le16_to_cpu(hdr->slen);
2738 } else {
2739 struct hci_iso_data_hdr *hdr;
2740
2741 hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
2742 if (!hdr) {
2743 BT_ERR("Frame is too short (len %d)", skb->len);
2744 goto drop;
2745 }
2746
2747 sn = __le16_to_cpu(hdr->sn);
2748 len = __le16_to_cpu(hdr->slen);
2749 }
2750
2751 flags = hci_iso_data_flags(len);
2752 len = hci_iso_data_len(len);
2753
2754 BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x sn %d",
2755 len, skb->len, flags, sn);
2756
2757 if (len == skb->len) {
2758 /* Complete frame received */
2759 hci_skb_pkt_status(skb) = flags & 0x03;
2760 hci_skb_pkt_seqnum(skb) = sn;
2761 iso_recv_frame(conn, skb);
2762 goto done;
2763 }
2764
2765 if (pb == ISO_SINGLE) {
2766 BT_ERR("Frame malformed (len %d, expected len %d)",
2767 skb->len, len);
2768 goto drop;
2769 }
2770
2771 if (skb->len > len) {
2772 BT_ERR("Frame is too long (len %d, expected len %d)",
2773 skb->len, len);
2774 goto drop;
2775 }
2776
2777 /* Allocate skb for the complete frame (with header) */
2778 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
2779 if (!conn->rx_skb)
2780 goto drop;
2781
2782 hci_skb_pkt_status(conn->rx_skb) = flags & 0x03;
2783 hci_skb_pkt_seqnum(conn->rx_skb) = sn;
2784 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2785 skb->len);
2786 conn->rx_len = len - skb->len;
2787
2788 /* Copy hw timestamp from skb to rx_skb if present */
2789 if (ts) {
2790 hwts = skb_hwtstamps(conn->rx_skb);
2791 hwts->hwtstamp = skb_hwtstamps(skb)->hwtstamp;
2792 }
2793
2794 break;
2795
2796 case ISO_CONT:
2797 case ISO_END:
2798 BT_DBG("%s: frag len %d (expecting %d)",
2799 (pb == ISO_END) ? "End" : "Cont", skb->len,
2800 conn->rx_len);
2801
2802 if (!conn->rx_skb) {
2803 BT_ERR("Unexpected ISO %s frame (len %d)",
2804 (pb == ISO_END) ? "End" : "Cont", skb->len);
2805 goto drop;
2806 }
2807
2808 if (skb->len > conn->rx_len) {
2809 BT_ERR("Fragment is too long (len %d, expected %d)",
2810 skb->len, conn->rx_len);
2811 kfree_skb(conn->rx_skb);
2812 conn->rx_skb = NULL;
2813 conn->rx_len = 0;
2814 goto drop;
2815 }
2816
2817 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2818 skb->len);
2819 conn->rx_len -= skb->len;
2820
2821 if (pb == ISO_CONT)
2822 break;
2823
2824 if (!conn->rx_len) {
2825 struct sk_buff *rx_skb = conn->rx_skb;
2826
2827 /* Complete frame received. iso_recv_frame
2828 * takes ownership of the skb so set the global
2829 * rx_skb pointer to NULL first.
2830 */
2831 conn->rx_skb = NULL;
2832 iso_recv_frame(conn, rx_skb);
2833 } else {
2834 BT_ERR("ISO fragment incomplete (len %d, expected %d)",
2835 skb->len, conn->rx_len);
2836 kfree_skb(conn->rx_skb);
2837 conn->rx_skb = NULL;
2838 conn->rx_len = 0;
2839 goto drop;
2840 }
2841 break;
2842 }
2843
2844 drop:
2845 kfree_skb(skb);
2846 done:
2847 iso_conn_put(conn);
2848 return 0;
2849 }
2850
2851 static struct hci_cb iso_cb = {
2852 .name = "ISO",
2853 .connect_cfm = iso_connect_cfm,
2854 .disconn_cfm = iso_disconn_cfm,
2855 };
2856
iso_debugfs_show(struct seq_file * f,void * p)2857 static int iso_debugfs_show(struct seq_file *f, void *p)
2858 {
2859 struct sock *sk;
2860
2861 read_lock(&iso_sk_list.lock);
2862
2863 sk_for_each(sk, &iso_sk_list.head) {
2864 seq_printf(f, "%pMR %pMR %d\n", &iso_pi(sk)->src,
2865 &iso_pi(sk)->dst, sk->sk_state);
2866 }
2867
2868 read_unlock(&iso_sk_list.lock);
2869
2870 return 0;
2871 }
2872
2873 DEFINE_SHOW_ATTRIBUTE(iso_debugfs);
2874
2875 static struct dentry *iso_debugfs;
2876
2877 static const struct proto_ops iso_sock_ops = {
2878 .family = PF_BLUETOOTH,
2879 .owner = THIS_MODULE,
2880 .release = iso_sock_release,
2881 .bind = iso_sock_bind,
2882 .connect = iso_sock_connect,
2883 .listen = iso_sock_listen,
2884 .accept = iso_sock_accept,
2885 .getname = iso_sock_getname,
2886 .sendmsg = iso_sock_sendmsg,
2887 .recvmsg = iso_sock_recvmsg,
2888 .poll = bt_sock_poll,
2889 .ioctl = bt_sock_ioctl,
2890 .mmap = sock_no_mmap,
2891 .socketpair = sock_no_socketpair,
2892 .shutdown = iso_sock_shutdown,
2893 .setsockopt = iso_sock_setsockopt,
2894 .getsockopt_iter = iso_sock_getsockopt
2895 };
2896
2897 static const struct net_proto_family iso_sock_family_ops = {
2898 .family = PF_BLUETOOTH,
2899 .owner = THIS_MODULE,
2900 .create = iso_sock_create,
2901 };
2902
2903 static bool inited;
2904
iso_inited(void)2905 bool iso_inited(void)
2906 {
2907 return inited;
2908 }
2909
iso_init(void)2910 int iso_init(void)
2911 {
2912 int err;
2913
2914 BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr));
2915
2916 if (inited)
2917 return -EALREADY;
2918
2919 err = proto_register(&iso_proto, 0);
2920 if (err < 0)
2921 return err;
2922
2923 err = bt_sock_register(BTPROTO_ISO, &iso_sock_family_ops);
2924 if (err < 0) {
2925 BT_ERR("ISO socket registration failed");
2926 goto error;
2927 }
2928
2929 err = bt_procfs_init(&init_net, "iso", &iso_sk_list, NULL);
2930 if (err < 0) {
2931 BT_ERR("Failed to create ISO proc file");
2932 bt_sock_unregister(BTPROTO_ISO);
2933 goto error;
2934 }
2935
2936 BT_INFO("ISO socket layer initialized");
2937
2938 hci_register_cb(&iso_cb);
2939
2940 if (!IS_ERR_OR_NULL(bt_debugfs))
2941 iso_debugfs = debugfs_create_file("iso", 0444, bt_debugfs,
2942 NULL, &iso_debugfs_fops);
2943
2944 inited = true;
2945
2946 return 0;
2947
2948 error:
2949 proto_unregister(&iso_proto);
2950 return err;
2951 }
2952
iso_exit(void)2953 int iso_exit(void)
2954 {
2955 if (!inited)
2956 return -EALREADY;
2957
2958 bt_procfs_cleanup(&init_net, "iso");
2959
2960 debugfs_remove(iso_debugfs);
2961 iso_debugfs = NULL;
2962
2963 hci_unregister_cb(&iso_cb);
2964
2965 bt_sock_unregister(BTPROTO_ISO);
2966
2967 proto_unregister(&iso_proto);
2968
2969 inited = false;
2970
2971 return 0;
2972 }
2973