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