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) 104 105 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 } 128 129 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 } 152 153 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 } 165 166 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 } 173 174 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 } 183 184 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 } 199 200 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 } 212 213 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 } 218 219 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 ---- */ 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. */ 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 } 297 298 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 } 339 340 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 } 367 368 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 } 379 380 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 } 387 388 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 } 491 492 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 } 596 597 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 } 604 605 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 } 635 636 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 ---------- */ 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 } 681 682 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 */ 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 } 771 772 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 } 810 811 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 static void iso_sock_cleanup_listen(struct sock *parent) 823 { 824 struct sock *sk; 825 826 BT_DBG("parent %p", parent); 827 828 /* Close not yet accepted channels */ 829 while ((sk = bt_accept_dequeue(parent, NULL))) { 830 iso_sock_close(sk); 831 iso_sock_kill(sk); 832 /* Drop the reference handed back by bt_accept_dequeue(). */ 833 sock_put(sk); 834 } 835 836 /* If listening socket has a hcon, properly disconnect it */ 837 if (iso_pi(parent)->conn && iso_pi(parent)->conn->hcon) { 838 iso_sock_disconn(parent); 839 return; 840 } 841 842 parent->sk_state = BT_CLOSED; 843 sock_set_flag(parent, SOCK_ZAPPED); 844 } 845 846 /* Kill socket (only if zapped and orphan) 847 * Must be called on unlocked socket. 848 */ 849 static void iso_sock_kill(struct sock *sk) 850 { 851 iso_sock_disable_timer(sk); 852 853 lock_sock(sk); 854 855 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket || 856 test_bit(BT_SK_KILLED, &iso_pi(sk)->flags)) { 857 release_sock(sk); 858 return; 859 } 860 861 BT_DBG("sk %p state %d", sk, sk->sk_state); 862 863 /* Sock is dead, so set conn->sk to NULL to avoid possible UAF */ 864 if (iso_pi(sk)->conn) { 865 iso_conn_lock(iso_pi(sk)->conn); 866 iso_pi(sk)->conn->sk = NULL; 867 iso_conn_unlock(iso_pi(sk)->conn); 868 } 869 870 /* Kill poor orphan */ 871 bt_sock_unlink(&iso_sk_list, sk); 872 sock_set_flag(sk, SOCK_DEAD); 873 set_bit(BT_SK_KILLED, &iso_pi(sk)->flags); 874 875 release_sock(sk); 876 sock_put(sk); 877 } 878 879 static void iso_sock_disconn(struct sock *sk) 880 { 881 struct sock *bis_sk; 882 struct hci_conn *hcon = iso_pi(sk)->conn->hcon; 883 884 if (test_bit(HCI_CONN_BIG_CREATED, &hcon->flags)) { 885 bis_sk = iso_get_sock_big(sk, &iso_pi(sk)->src, 886 &iso_pi(sk)->dst, 887 iso_pi(sk)->qos.bcast.big); 888 889 /* If there are any other connected sockets for the 890 * same BIG, just delete the sk and leave the bis 891 * hcon active, in case later rebinding is needed. 892 */ 893 if (bis_sk) { 894 hcon->state = BT_OPEN; 895 set_bit(ISO_CONN_DROPPED, iso_pi(sk)->conn->flags); 896 897 iso_sock_clear_timer(sk); 898 iso_chan_del(sk, bt_to_errno(hcon->abort_reason)); 899 sock_put(bis_sk); 900 return; 901 } 902 } 903 904 sk->sk_state = BT_DISCONN; 905 if (!test_and_set_bit(ISO_CONN_DROPPED, iso_pi(sk)->conn->flags)) 906 hci_conn_drop(iso_pi(sk)->conn->hcon); 907 } 908 909 static void __iso_sock_close(struct sock *sk) 910 { 911 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); 912 913 switch (sk->sk_state) { 914 case BT_LISTEN: 915 iso_sock_cleanup_listen(sk); 916 break; 917 918 case BT_CONNECT: 919 case BT_CONNECTED: 920 case BT_CONFIG: 921 if (iso_pi(sk)->conn->hcon) 922 iso_sock_disconn(sk); 923 else 924 iso_chan_del(sk, ECONNRESET); 925 break; 926 927 case BT_CONNECT2: 928 if (iso_pi(sk)->conn->hcon && 929 (test_bit(HCI_CONN_PA_SYNC, &iso_pi(sk)->conn->hcon->flags) || 930 test_bit(HCI_CONN_PA_SYNC_FAILED, &iso_pi(sk)->conn->hcon->flags))) 931 iso_sock_disconn(sk); 932 else 933 iso_chan_del(sk, ECONNRESET); 934 break; 935 case BT_DISCONN: 936 iso_chan_del(sk, ECONNRESET); 937 break; 938 939 default: 940 sock_set_flag(sk, SOCK_ZAPPED); 941 break; 942 } 943 } 944 945 /* Must be called on unlocked socket. */ 946 static void iso_sock_close(struct sock *sk) 947 { 948 iso_sock_disable_timer(sk); 949 950 lock_sock(sk); 951 __iso_sock_close(sk); 952 release_sock(sk); 953 } 954 955 static void iso_sock_init(struct sock *sk, struct sock *parent) 956 { 957 BT_DBG("sk %p", sk); 958 959 if (parent) { 960 sk->sk_type = parent->sk_type; 961 bt_sk(sk)->flags = bt_sk(parent)->flags; 962 security_sk_clone(parent, sk); 963 } 964 } 965 966 static struct proto iso_proto = { 967 .name = "ISO", 968 .owner = THIS_MODULE, 969 .obj_size = sizeof(struct iso_pinfo) 970 }; 971 972 #define DEFAULT_IO_QOS \ 973 { \ 974 .interval = 10000u, \ 975 .latency = 10u, \ 976 .sdu = 40u, \ 977 .phys = BT_ISO_PHY_2M, \ 978 .rtn = 2u, \ 979 } 980 981 static struct bt_iso_qos default_qos = { 982 .bcast = { 983 .big = BT_ISO_QOS_BIG_UNSET, 984 .bis = BT_ISO_QOS_BIS_UNSET, 985 .sync_factor = 0x01, 986 .packing = 0x00, 987 .framing = 0x00, 988 .in = DEFAULT_IO_QOS, 989 .out = DEFAULT_IO_QOS, 990 .encryption = 0x00, 991 .bcode = {0x00}, 992 .options = 0x00, 993 .skip = 0x0000, 994 .sync_timeout = BT_ISO_SYNC_TIMEOUT, 995 .sync_cte_type = 0x00, 996 .mse = 0x00, 997 .timeout = BT_ISO_SYNC_TIMEOUT, 998 }, 999 }; 1000 1001 static struct sock *iso_sock_alloc(struct net *net, struct socket *sock, 1002 int proto, gfp_t prio, int kern) 1003 { 1004 struct sock *sk; 1005 1006 sk = bt_sock_alloc(net, sock, &iso_proto, proto, prio, kern); 1007 if (!sk) 1008 return NULL; 1009 1010 sk->sk_destruct = iso_sock_destruct; 1011 sk->sk_sndtimeo = ISO_CONN_TIMEOUT; 1012 1013 /* Set address type as public as default src address is BDADDR_ANY */ 1014 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC; 1015 1016 iso_pi(sk)->qos = default_qos; 1017 iso_pi(sk)->sync_handle = -1; 1018 1019 INIT_DELAYED_WORK(&iso_pi(sk)->timeout_work, iso_sock_timeout); 1020 1021 bt_sock_link(&iso_sk_list, sk); 1022 return sk; 1023 } 1024 1025 static int iso_sock_create(struct net *net, struct socket *sock, int protocol, 1026 int kern) 1027 { 1028 struct sock *sk; 1029 1030 BT_DBG("sock %p", sock); 1031 1032 sock->state = SS_UNCONNECTED; 1033 1034 if (sock->type != SOCK_SEQPACKET) 1035 return -ESOCKTNOSUPPORT; 1036 1037 sock->ops = &iso_sock_ops; 1038 1039 sk = iso_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern); 1040 if (!sk) 1041 return -ENOMEM; 1042 1043 iso_sock_init(sk, NULL); 1044 return 0; 1045 } 1046 1047 static int iso_sock_bind_bc(struct socket *sock, struct sockaddr_unsized *addr, 1048 int addr_len) 1049 { 1050 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr; 1051 struct sock *sk = sock->sk; 1052 int i; 1053 1054 BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid, 1055 sa->iso_bc->bc_num_bis); 1056 1057 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc)) 1058 return -EINVAL; 1059 1060 bacpy(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr); 1061 1062 /* Check if the address type is of LE type */ 1063 if (!bdaddr_type_is_le(sa->iso_bc->bc_bdaddr_type)) 1064 return -EINVAL; 1065 1066 iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type; 1067 1068 if (sa->iso_bc->bc_sid > 0x0f && sa->iso_bc->bc_sid != HCI_SID_INVALID) 1069 return -EINVAL; 1070 1071 iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid; 1072 1073 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS) 1074 return -EINVAL; 1075 1076 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis; 1077 1078 for (i = 0; i < iso_pi(sk)->bc_num_bis; i++) 1079 if (sa->iso_bc->bc_bis[i] < 0x01 || 1080 sa->iso_bc->bc_bis[i] > 0x1f) 1081 return -EINVAL; 1082 1083 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis, 1084 iso_pi(sk)->bc_num_bis); 1085 1086 return 0; 1087 } 1088 1089 /* Must be called on the locked socket. */ 1090 static int iso_sock_rebind_bis(struct sock *sk, struct sockaddr_iso *sa, 1091 int addr_len) 1092 { 1093 int err = 0; 1094 1095 if (!test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) 1096 return -EBADFD; 1097 1098 if (sa->iso_bc->bc_num_bis > ISO_MAX_NUM_BIS) { 1099 err = -EINVAL; 1100 goto done; 1101 } 1102 1103 for (int i = 0; i < sa->iso_bc->bc_num_bis; i++) 1104 if (sa->iso_bc->bc_bis[i] < 0x01 || 1105 sa->iso_bc->bc_bis[i] > 0x1f) { 1106 err = -EINVAL; 1107 goto done; 1108 } 1109 1110 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis; 1111 1112 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis, 1113 iso_pi(sk)->bc_num_bis); 1114 1115 done: 1116 return err; 1117 } 1118 1119 static struct hci_dev *iso_conn_get_hdev(struct iso_conn *conn) 1120 { 1121 struct hci_dev *hdev = NULL; 1122 1123 iso_conn_lock(conn); 1124 if (conn->hcon) 1125 hdev = hci_dev_hold(conn->hcon->hdev); 1126 iso_conn_unlock(conn); 1127 1128 return hdev; 1129 } 1130 1131 /* Must be called on the locked socket. */ 1132 static int iso_sock_rebind_bc(struct sock *sk, struct sockaddr_iso *sa, 1133 int addr_len) 1134 { 1135 struct hci_dev *hdev; 1136 struct hci_conn *bis; 1137 int err; 1138 1139 if (sk->sk_type != SOCK_SEQPACKET || !iso_pi(sk)->conn) 1140 return -EINVAL; 1141 1142 /* Check if it is really a Broadcast address being requested */ 1143 if (addr_len != sizeof(*sa) + sizeof(*sa->iso_bc)) 1144 return -EINVAL; 1145 1146 /* Check if the address hasn't changed then perhaps only the number of 1147 * bis has changed. 1148 */ 1149 if (!bacmp(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr) || 1150 !bacmp(&sa->iso_bc->bc_bdaddr, BDADDR_ANY)) 1151 return iso_sock_rebind_bis(sk, sa, addr_len); 1152 1153 /* Check if the address type is of LE type */ 1154 if (!bdaddr_type_is_le(sa->iso_bc->bc_bdaddr_type)) 1155 return -EINVAL; 1156 1157 hdev = iso_conn_get_hdev(iso_pi(sk)->conn); 1158 if (!hdev) 1159 return -EINVAL; 1160 1161 bis = iso_pi(sk)->conn->hcon; 1162 1163 /* Release the socket before lookups since that requires hci_dev_lock 1164 * which shall not be acquired while holding sock_lock for proper 1165 * ordering. 1166 */ 1167 release_sock(sk); 1168 hci_dev_lock(hdev); 1169 lock_sock(sk); 1170 1171 if (!iso_pi(sk)->conn || iso_pi(sk)->conn->hcon != bis) { 1172 /* raced with iso_conn_del() or iso_disconn_sock() */ 1173 err = -ENOTCONN; 1174 goto unlock; 1175 } 1176 1177 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bc->bc_bdaddr, 1178 sa->iso_bc->bc_bdaddr_type); 1179 1180 err = hci_past_bis(bis, &sa->iso_bc->bc_bdaddr, 1181 le_addr_type(sa->iso_bc->bc_bdaddr_type)); 1182 1183 unlock: 1184 hci_dev_unlock(hdev); 1185 hci_dev_put(hdev); 1186 1187 return err; 1188 } 1189 1190 static int iso_sock_bind(struct socket *sock, struct sockaddr_unsized *addr, 1191 int addr_len) 1192 { 1193 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr; 1194 struct sock *sk = sock->sk; 1195 int err = 0; 1196 1197 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type); 1198 1199 if (!addr || addr_len < sizeof(struct sockaddr_iso) || 1200 addr->sa_family != AF_BLUETOOTH) 1201 return -EINVAL; 1202 1203 lock_sock(sk); 1204 1205 if ((sk->sk_state == BT_CONNECT2 || sk->sk_state == BT_CONNECTED) && 1206 addr_len > sizeof(*sa)) { 1207 /* Allow the user to rebind to a different address using 1208 * PAST procedures. 1209 */ 1210 err = iso_sock_rebind_bc(sk, sa, addr_len); 1211 goto done; 1212 } 1213 1214 if (sk->sk_state != BT_OPEN) { 1215 err = -EBADFD; 1216 goto done; 1217 } 1218 1219 if (sk->sk_type != SOCK_SEQPACKET) { 1220 err = -EINVAL; 1221 goto done; 1222 } 1223 1224 /* Check if the address type is of LE type */ 1225 if (!bdaddr_type_is_le(sa->iso_bdaddr_type)) { 1226 err = -EINVAL; 1227 goto done; 1228 } 1229 1230 bacpy(&iso_pi(sk)->src, &sa->iso_bdaddr); 1231 iso_pi(sk)->src_type = sa->iso_bdaddr_type; 1232 1233 /* Check for Broadcast address */ 1234 if (addr_len > sizeof(*sa)) { 1235 err = iso_sock_bind_bc(sock, addr, addr_len); 1236 if (err) 1237 goto done; 1238 } 1239 1240 sk->sk_state = BT_BOUND; 1241 1242 done: 1243 release_sock(sk); 1244 return err; 1245 } 1246 1247 static int iso_sock_connect(struct socket *sock, struct sockaddr_unsized *addr, 1248 int alen, int flags) 1249 { 1250 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr; 1251 struct sock *sk = sock->sk; 1252 int err; 1253 1254 BT_DBG("sk %p", sk); 1255 1256 if (alen < sizeof(struct sockaddr_iso) || 1257 addr->sa_family != AF_BLUETOOTH) 1258 return -EINVAL; 1259 1260 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) 1261 return -EBADFD; 1262 1263 if (sk->sk_type != SOCK_SEQPACKET) 1264 return -EINVAL; 1265 1266 /* Check if the address type is of LE type */ 1267 if (!bdaddr_type_is_le(sa->iso_bdaddr_type)) 1268 return -EINVAL; 1269 1270 lock_sock(sk); 1271 1272 bacpy(&iso_pi(sk)->dst, &sa->iso_bdaddr); 1273 iso_pi(sk)->dst_type = sa->iso_bdaddr_type; 1274 1275 release_sock(sk); 1276 1277 if (bacmp(&sa->iso_bdaddr, BDADDR_ANY)) 1278 err = iso_connect_cis(sk); 1279 else 1280 err = iso_connect_bis(sk); 1281 1282 if (err) 1283 return err; 1284 1285 lock_sock(sk); 1286 1287 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { 1288 err = bt_sock_wait_state(sk, BT_CONNECTED, 1289 sock_sndtimeo(sk, flags & O_NONBLOCK)); 1290 } 1291 1292 release_sock(sk); 1293 return err; 1294 } 1295 1296 static int iso_listen_bis(struct sock *sk) 1297 { 1298 struct iso_conn *conn; 1299 struct hci_conn *hcon; 1300 struct hci_dev *hdev; 1301 bdaddr_t src, dst; 1302 u8 src_type, bc_sid; 1303 int err = 0; 1304 1305 lock_sock(sk); 1306 bacpy(&src, &iso_pi(sk)->src); 1307 bacpy(&dst, &iso_pi(sk)->dst); 1308 src_type = iso_pi(sk)->src_type; 1309 bc_sid = iso_pi(sk)->bc_sid; 1310 release_sock(sk); 1311 1312 BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &src, &dst, bc_sid); 1313 1314 write_lock(&iso_sk_list.lock); 1315 1316 if (__iso_get_sock_listen_by_sid(&src, &dst, bc_sid)) 1317 err = -EADDRINUSE; 1318 1319 write_unlock(&iso_sk_list.lock); 1320 1321 if (err) 1322 return err; 1323 1324 hdev = hci_get_route(&dst, &src, src_type); 1325 if (!hdev) 1326 return -EHOSTUNREACH; 1327 1328 hci_dev_lock(hdev); 1329 lock_sock(sk); 1330 1331 /* Fail if user set invalid QoS */ 1332 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(&iso_pi(sk)->qos)) { 1333 iso_pi(sk)->qos = default_qos; 1334 err = -EINVAL; 1335 goto unlock; 1336 } 1337 1338 hcon = hci_pa_create_sync(hdev, &iso_pi(sk)->dst, 1339 le_addr_type(iso_pi(sk)->dst_type), 1340 iso_pi(sk)->bc_sid, &iso_pi(sk)->qos); 1341 if (IS_ERR(hcon)) { 1342 err = PTR_ERR(hcon); 1343 goto unlock; 1344 } 1345 1346 lockdep_assert_held(&hcon->hdev->lock); 1347 1348 conn = iso_conn_add(hcon); 1349 if (!conn) { 1350 hci_conn_drop(hcon); 1351 err = -ENOMEM; 1352 goto unlock; 1353 } 1354 1355 err = iso_chan_add(conn, sk, NULL); 1356 iso_conn_put(conn); 1357 if (err) 1358 goto unlock; 1359 1360 unlock: 1361 release_sock(sk); 1362 hci_dev_unlock(hdev); 1363 hci_dev_put(hdev); 1364 return err; 1365 } 1366 1367 static int iso_listen_cis(struct sock *sk) 1368 { 1369 int err = 0; 1370 1371 BT_DBG("%pMR", &iso_pi(sk)->src); 1372 1373 write_lock(&iso_sk_list.lock); 1374 1375 if (__iso_get_sock_listen_by_addr(&iso_pi(sk)->src, &iso_pi(sk)->dst)) 1376 err = -EADDRINUSE; 1377 1378 write_unlock(&iso_sk_list.lock); 1379 1380 return err; 1381 } 1382 1383 static int iso_sock_listen(struct socket *sock, int backlog) 1384 { 1385 struct sock *sk = sock->sk; 1386 int err = 0; 1387 1388 BT_DBG("sk %p backlog %d", sk, backlog); 1389 1390 sock_hold(sk); 1391 lock_sock(sk); 1392 1393 if (sk->sk_state != BT_BOUND) { 1394 err = -EBADFD; 1395 goto done; 1396 } 1397 1398 if (sk->sk_type != SOCK_SEQPACKET) { 1399 err = -EINVAL; 1400 goto done; 1401 } 1402 1403 if (!bacmp(&iso_pi(sk)->dst, BDADDR_ANY)) { 1404 err = iso_listen_cis(sk); 1405 } else { 1406 /* Drop sock lock to avoid potential 1407 * deadlock with the hdev lock. 1408 */ 1409 release_sock(sk); 1410 err = iso_listen_bis(sk); 1411 lock_sock(sk); 1412 } 1413 1414 if (err) 1415 goto done; 1416 1417 sk->sk_max_ack_backlog = backlog; 1418 sk->sk_ack_backlog = 0; 1419 1420 sk->sk_state = BT_LISTEN; 1421 1422 done: 1423 release_sock(sk); 1424 sock_put(sk); 1425 return err; 1426 } 1427 1428 static int iso_sock_accept(struct socket *sock, struct socket *newsock, 1429 struct proto_accept_arg *arg) 1430 { 1431 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1432 struct sock *sk = sock->sk, *ch; 1433 long timeo; 1434 int err = 0; 1435 1436 /* Use explicit nested locking to avoid lockdep warnings generated 1437 * because the parent socket and the child socket are locked on the 1438 * same thread. 1439 */ 1440 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 1441 1442 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK); 1443 1444 BT_DBG("sk %p timeo %ld", sk, timeo); 1445 1446 /* Wait for an incoming connection. (wake-one). */ 1447 add_wait_queue_exclusive(sk_sleep(sk), &wait); 1448 while (1) { 1449 if (sk->sk_state != BT_LISTEN) { 1450 err = -EBADFD; 1451 break; 1452 } 1453 1454 ch = bt_accept_dequeue(sk, newsock); 1455 if (ch) { 1456 /* Drop the bridging ref from bt_accept_dequeue(); 1457 * the grafted socket keeps ch alive from here. 1458 */ 1459 sock_put(ch); 1460 break; 1461 } 1462 1463 if (!timeo) { 1464 err = -EAGAIN; 1465 break; 1466 } 1467 1468 if (signal_pending(current)) { 1469 err = sock_intr_errno(timeo); 1470 break; 1471 } 1472 1473 release_sock(sk); 1474 1475 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 1476 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 1477 } 1478 remove_wait_queue(sk_sleep(sk), &wait); 1479 1480 if (err) 1481 goto done; 1482 1483 newsock->state = SS_CONNECTED; 1484 1485 BT_DBG("new socket %p", ch); 1486 1487 /* A Broadcast Sink might require BIG sync to be terminated 1488 * and re-established multiple times, while keeping the same 1489 * PA sync handle active. To allow this, once all BIS 1490 * connections have been accepted on a PA sync parent socket, 1491 * "reset" socket state, to allow future BIG re-sync procedures. 1492 */ 1493 if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) { 1494 /* Iterate through the list of bound BIS indices 1495 * and clear each BIS as they are accepted by the 1496 * user space, one by one. 1497 */ 1498 for (int i = 0; i < iso_pi(sk)->bc_num_bis; i++) { 1499 if (iso_pi(sk)->bc_bis[i] > 0) { 1500 iso_pi(sk)->bc_bis[i] = 0; 1501 iso_pi(sk)->bc_num_bis--; 1502 break; 1503 } 1504 } 1505 1506 if (iso_pi(sk)->bc_num_bis == 0) { 1507 /* Once the last BIS was accepted, reset parent 1508 * socket parameters to mark that the listening 1509 * process for BIS connections has been completed: 1510 * 1511 * 1. Reset the DEFER setup flag on the parent sk. 1512 * 2. Clear the flag marking that the BIG create 1513 * sync command is pending. 1514 * 3. Transition socket state from BT_LISTEN to 1515 * BT_CONNECTED. 1516 */ 1517 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 1518 clear_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags); 1519 sk->sk_state = BT_CONNECTED; 1520 } 1521 } 1522 1523 done: 1524 release_sock(sk); 1525 return err; 1526 } 1527 1528 static int iso_sock_getname(struct socket *sock, struct sockaddr *addr, 1529 int peer) 1530 { 1531 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr; 1532 struct sock *sk = sock->sk; 1533 int len = sizeof(struct sockaddr_iso); 1534 1535 BT_DBG("sock %p, sk %p", sock, sk); 1536 1537 lock_sock(sk); 1538 1539 memset(sa, 0, sizeof(struct sockaddr_iso)); 1540 addr->sa_family = AF_BLUETOOTH; 1541 1542 if (peer) { 1543 struct hci_conn *hcon = iso_pi(sk)->conn ? 1544 iso_pi(sk)->conn->hcon : NULL; 1545 1546 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->dst); 1547 sa->iso_bdaddr_type = iso_pi(sk)->dst_type; 1548 1549 if (hcon && (hcon->type == BIS_LINK || hcon->type == PA_LINK)) { 1550 memset(sa->iso_bc, 0, sizeof(struct sockaddr_iso_bc)); 1551 sa->iso_bc->bc_sid = iso_pi(sk)->bc_sid; 1552 sa->iso_bc->bc_num_bis = iso_pi(sk)->bc_num_bis; 1553 memcpy(sa->iso_bc->bc_bis, iso_pi(sk)->bc_bis, 1554 ISO_MAX_NUM_BIS); 1555 len += sizeof(struct sockaddr_iso_bc); 1556 } 1557 } else { 1558 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->src); 1559 sa->iso_bdaddr_type = iso_pi(sk)->src_type; 1560 } 1561 1562 release_sock(sk); 1563 1564 return len; 1565 } 1566 1567 static int iso_sock_sendmsg(struct socket *sock, struct msghdr *msg, 1568 size_t len) 1569 { 1570 struct sock *sk = sock->sk; 1571 struct sk_buff *skb, **frag; 1572 struct sockcm_cookie sockc; 1573 size_t mtu; 1574 int err; 1575 1576 BT_DBG("sock %p, sk %p", sock, sk); 1577 1578 err = sock_error(sk); 1579 if (err) 1580 return err; 1581 1582 if (msg->msg_flags & MSG_OOB) 1583 return -EOPNOTSUPP; 1584 1585 hci_sockcm_init(&sockc, sk); 1586 1587 if (msg->msg_controllen) { 1588 err = sock_cmsg_send(sk, msg, &sockc); 1589 if (err) 1590 return err; 1591 } 1592 1593 lock_sock(sk); 1594 1595 if (sk->sk_state != BT_CONNECTED) { 1596 release_sock(sk); 1597 return -ENOTCONN; 1598 } 1599 1600 mtu = iso_pi(sk)->conn->hcon->mtu; 1601 1602 release_sock(sk); 1603 1604 skb = bt_skb_sendmsg(sk, msg, len, mtu, HCI_ISO_DATA_HDR_SIZE, 0); 1605 if (IS_ERR(skb)) 1606 return PTR_ERR(skb); 1607 1608 len -= skb->len; 1609 1610 BT_DBG("skb %p len %d", sk, skb->len); 1611 1612 /* Continuation fragments */ 1613 frag = &skb_shinfo(skb)->frag_list; 1614 while (len) { 1615 struct sk_buff *tmp; 1616 1617 tmp = bt_skb_sendmsg(sk, msg, len, mtu, 0, 0); 1618 if (IS_ERR(tmp)) { 1619 kfree_skb(skb); 1620 return PTR_ERR(tmp); 1621 } 1622 1623 *frag = tmp; 1624 1625 len -= tmp->len; 1626 1627 skb->len += tmp->len; 1628 skb->data_len += tmp->len; 1629 1630 BT_DBG("frag %p len %d", *frag, tmp->len); 1631 1632 frag = &(*frag)->next; 1633 } 1634 1635 lock_sock(sk); 1636 1637 if (sk->sk_state == BT_CONNECTED) 1638 err = iso_send_frame(sk, skb, &sockc); 1639 else 1640 err = -ENOTCONN; 1641 1642 release_sock(sk); 1643 1644 if (err < 0) 1645 kfree_skb(skb); 1646 return err; 1647 } 1648 1649 static void iso_conn_defer_accept(struct hci_conn *conn) 1650 { 1651 struct hci_cp_le_accept_cis cp; 1652 struct hci_dev *hdev = conn->hdev; 1653 1654 BT_DBG("conn %p", conn); 1655 1656 conn->state = BT_CONFIG; 1657 1658 cp.handle = cpu_to_le16(conn->handle); 1659 1660 hci_send_cmd(hdev, HCI_OP_LE_ACCEPT_CIS, sizeof(cp), &cp); 1661 } 1662 1663 static int iso_conn_big_sync(struct sock *sk) 1664 { 1665 int err = 0; 1666 struct hci_dev *hdev; 1667 struct iso_conn *conn; 1668 bdaddr_t src, dst; 1669 u8 src_type; 1670 1671 lock_sock(sk); 1672 bacpy(&src, &iso_pi(sk)->src); 1673 bacpy(&dst, &iso_pi(sk)->dst); 1674 src_type = iso_pi(sk)->src_type; 1675 release_sock(sk); 1676 1677 hdev = hci_get_route(&dst, &src, src_type); 1678 1679 if (!hdev) 1680 return -EHOSTUNREACH; 1681 1682 /* hci_le_big_create_sync requires hdev lock to be held, since 1683 * it enqueues the HCI LE BIG Create Sync command via 1684 * hci_cmd_sync_queue_once, which checks hdev flags that might 1685 * change. 1686 */ 1687 hci_dev_lock(hdev); 1688 lock_sock(sk); 1689 1690 /* The socket lock was dropped for hci_get_route(), so the connection 1691 * may have been torn down meanwhile: iso_chan_del() clears conn and 1692 * the broadcast teardown path can clear conn->hcon on its own. Check 1693 * both before dereferencing conn->hcon. 1694 */ 1695 conn = iso_pi(sk)->conn; 1696 if (!conn || !conn->hcon) { 1697 err = -ENOTCONN; 1698 goto unlock; 1699 } 1700 1701 if (!test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags)) { 1702 err = hci_conn_big_create_sync(hdev, conn->hcon, 1703 &iso_pi(sk)->qos, 1704 iso_pi(sk)->sync_handle, 1705 iso_pi(sk)->bc_num_bis, 1706 iso_pi(sk)->bc_bis); 1707 if (err) 1708 bt_dev_err(hdev, "hci_big_create_sync: %d", err); 1709 } 1710 1711 unlock: 1712 release_sock(sk); 1713 hci_dev_unlock(hdev); 1714 hci_dev_put(hdev); 1715 1716 return err; 1717 } 1718 1719 static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1720 size_t len, int flags) 1721 { 1722 struct sock *sk = sock->sk; 1723 struct iso_pinfo *pi = iso_pi(sk); 1724 bool early_ret = false; 1725 int err = 0; 1726 1727 BT_DBG("sk %p", sk); 1728 1729 if (unlikely(flags & MSG_ERRQUEUE)) 1730 return sock_recv_errqueue(sk, msg, len, SOL_BLUETOOTH, 1731 BT_SCM_ERROR); 1732 1733 if (test_and_clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { 1734 sock_hold(sk); 1735 lock_sock(sk); 1736 1737 switch (sk->sk_state) { 1738 case BT_CONNECT2: 1739 if (test_bit(BT_SK_PA_SYNC, &pi->flags)) { 1740 release_sock(sk); 1741 err = iso_conn_big_sync(sk); 1742 lock_sock(sk); 1743 1744 /* The socket lock was dropped, so the 1745 * connection may have been torn down 1746 * meanwhile and iso_chan_del() may have 1747 * already moved the socket to BT_CLOSED. 1748 * Only move on to BT_LISTEN if the BIG sync 1749 * was actually started and nothing else has 1750 * changed the state. 1751 */ 1752 if (!err && sk->sk_state == BT_CONNECT2) 1753 sk->sk_state = BT_LISTEN; 1754 } else { 1755 iso_conn_defer_accept(pi->conn->hcon); 1756 sk->sk_state = BT_CONFIG; 1757 } 1758 1759 early_ret = true; 1760 break; 1761 case BT_CONNECTED: 1762 if (test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags)) { 1763 release_sock(sk); 1764 err = iso_conn_big_sync(sk); 1765 lock_sock(sk); 1766 1767 if (!err && sk->sk_state == BT_CONNECTED) 1768 sk->sk_state = BT_LISTEN; 1769 early_ret = true; 1770 } 1771 1772 break; 1773 case BT_CONNECT: 1774 release_sock(sk); 1775 err = iso_connect_cis(sk); 1776 lock_sock(sk); 1777 1778 early_ret = true; 1779 break; 1780 default: 1781 break; 1782 } 1783 1784 release_sock(sk); 1785 sock_put(sk); 1786 1787 if (early_ret) 1788 return err; 1789 } 1790 1791 return bt_sock_recvmsg(sock, msg, len, flags); 1792 } 1793 1794 static bool check_io_qos(struct bt_iso_io_qos *qos) 1795 { 1796 /* If no PHY is enable SDU must be 0 */ 1797 if (!qos->phys && qos->sdu) 1798 return false; 1799 1800 if (qos->interval && (qos->interval < 0xff || qos->interval > 0xfffff)) 1801 return false; 1802 1803 if (qos->latency && (qos->latency < 0x05 || qos->latency > 0xfa0)) 1804 return false; 1805 1806 if (qos->phys > BT_ISO_PHY_ANY) 1807 return false; 1808 1809 return true; 1810 } 1811 1812 static bool check_ucast_qos(struct bt_iso_qos *qos) 1813 { 1814 if (qos->ucast.cig > 0xef && qos->ucast.cig != BT_ISO_QOS_CIG_UNSET) 1815 return false; 1816 1817 if (qos->ucast.cis > 0xef && qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) 1818 return false; 1819 1820 if (qos->ucast.sca > 0x07) 1821 return false; 1822 1823 if (qos->ucast.packing > 0x01) 1824 return false; 1825 1826 if (qos->ucast.framing > 0x01) 1827 return false; 1828 1829 if (!check_io_qos(&qos->ucast.in)) 1830 return false; 1831 1832 if (!check_io_qos(&qos->ucast.out)) 1833 return false; 1834 1835 return true; 1836 } 1837 1838 static bool check_bcast_qos(struct bt_iso_qos *qos) 1839 { 1840 if (!qos->bcast.sync_factor) 1841 qos->bcast.sync_factor = 0x01; 1842 1843 if (qos->bcast.packing > 0x01) 1844 return false; 1845 1846 if (qos->bcast.framing > 0x01) 1847 return false; 1848 1849 if (!check_io_qos(&qos->bcast.in)) 1850 return false; 1851 1852 if (!check_io_qos(&qos->bcast.out)) 1853 return false; 1854 1855 if (qos->bcast.encryption > 0x01) 1856 return false; 1857 1858 if (qos->bcast.options > 0x07) 1859 return false; 1860 1861 if (qos->bcast.skip > 0x01f3) 1862 return false; 1863 1864 if (!qos->bcast.sync_timeout) 1865 qos->bcast.sync_timeout = BT_ISO_SYNC_TIMEOUT; 1866 1867 if (qos->bcast.sync_timeout < 0x000a || qos->bcast.sync_timeout > 0x4000) 1868 return false; 1869 1870 if (qos->bcast.sync_cte_type > 0x1f) 1871 return false; 1872 1873 if (qos->bcast.mse > 0x1f) 1874 return false; 1875 1876 if (!qos->bcast.timeout) 1877 qos->bcast.timeout = BT_ISO_SYNC_TIMEOUT; 1878 1879 if (qos->bcast.timeout < 0x000a || qos->bcast.timeout > 0x4000) 1880 return false; 1881 1882 return true; 1883 } 1884 1885 static int iso_sock_setsockopt(struct socket *sock, int level, int optname, 1886 sockptr_t optval, unsigned int optlen) 1887 { 1888 struct sock *sk = sock->sk; 1889 int err = 0; 1890 struct bt_iso_qos qos = default_qos; 1891 u32 opt; 1892 1893 BT_DBG("sk %p", sk); 1894 1895 lock_sock(sk); 1896 1897 switch (optname) { 1898 case BT_DEFER_SETUP: 1899 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { 1900 err = -EINVAL; 1901 break; 1902 } 1903 1904 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen); 1905 if (err) 1906 break; 1907 1908 if (opt) 1909 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 1910 else 1911 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 1912 break; 1913 1914 case BT_PKT_STATUS: 1915 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen); 1916 if (err) 1917 break; 1918 1919 if (opt) 1920 set_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags); 1921 else 1922 clear_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags); 1923 break; 1924 1925 case BT_PKT_SEQNUM: 1926 err = copy_safe_from_sockptr(&opt, sizeof(opt), optval, optlen); 1927 if (err) 1928 break; 1929 1930 if (opt) 1931 set_bit(BT_SK_PKT_SEQNUM, &bt_sk(sk)->flags); 1932 else 1933 clear_bit(BT_SK_PKT_SEQNUM, &bt_sk(sk)->flags); 1934 break; 1935 1936 case BT_ISO_QOS: 1937 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND && 1938 sk->sk_state != BT_CONNECT2 && 1939 (!test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags) || 1940 sk->sk_state != BT_CONNECTED)) { 1941 err = -EINVAL; 1942 break; 1943 } 1944 1945 err = copy_safe_from_sockptr(&qos, sizeof(qos), optval, optlen); 1946 if (err) 1947 break; 1948 1949 iso_pi(sk)->qos = qos; 1950 iso_pi(sk)->qos_user_set = true; 1951 1952 break; 1953 1954 case BT_ISO_BASE: 1955 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND && 1956 sk->sk_state != BT_CONNECT2) { 1957 err = -EINVAL; 1958 break; 1959 } 1960 1961 if (optlen > sizeof(iso_pi(sk)->base)) { 1962 err = -EINVAL; 1963 break; 1964 } 1965 1966 err = copy_safe_from_sockptr(iso_pi(sk)->base, optlen, optval, 1967 optlen); 1968 if (err) 1969 break; 1970 1971 iso_pi(sk)->base_len = optlen; 1972 1973 break; 1974 1975 default: 1976 err = -ENOPROTOOPT; 1977 break; 1978 } 1979 1980 release_sock(sk); 1981 return err; 1982 } 1983 1984 static int iso_sock_getsockopt(struct socket *sock, int level, int optname, 1985 sockopt_t *opt) 1986 { 1987 struct sock *sk = sock->sk; 1988 struct bt_iso_qos *qos; 1989 int len, val, err = 0; 1990 u8 base_len; 1991 u8 *base; 1992 1993 BT_DBG("sk %p", sk); 1994 1995 len = opt->optlen; 1996 1997 lock_sock(sk); 1998 1999 switch (optname) { 2000 case BT_DEFER_SETUP: 2001 if (sk->sk_state == BT_CONNECTED) { 2002 err = -EINVAL; 2003 break; 2004 } 2005 2006 val = test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 2007 if (copy_to_iter(&val, sizeof(val), &opt->iter_out) != 2008 sizeof(val)) 2009 err = -EFAULT; 2010 2011 break; 2012 2013 case BT_PKT_STATUS: 2014 val = test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags); 2015 if (copy_to_iter(&val, sizeof(val), &opt->iter_out) != 2016 sizeof(val)) 2017 err = -EFAULT; 2018 break; 2019 2020 case BT_ISO_QOS: 2021 qos = iso_sock_get_qos(sk); 2022 2023 len = min_t(unsigned int, len, sizeof(*qos)); 2024 if (copy_to_iter(qos, len, &opt->iter_out) != len) 2025 err = -EFAULT; 2026 2027 break; 2028 2029 case BT_ISO_BASE: 2030 if (sk->sk_state == BT_CONNECTED && 2031 !bacmp(&iso_pi(sk)->dst, BDADDR_ANY)) { 2032 base_len = iso_pi(sk)->conn->hcon->le_per_adv_data_len; 2033 base = iso_pi(sk)->conn->hcon->le_per_adv_data; 2034 } else { 2035 base_len = iso_pi(sk)->base_len; 2036 base = iso_pi(sk)->base; 2037 } 2038 2039 len = min_t(unsigned int, len, base_len); 2040 opt->optlen = len; 2041 if (copy_to_iter(base, len, &opt->iter_out) != len) 2042 err = -EFAULT; 2043 2044 break; 2045 2046 default: 2047 err = -ENOPROTOOPT; 2048 break; 2049 } 2050 2051 release_sock(sk); 2052 return err; 2053 } 2054 2055 static int iso_sock_shutdown(struct socket *sock, int how) 2056 { 2057 struct sock *sk = sock->sk; 2058 int err = 0; 2059 2060 BT_DBG("sock %p, sk %p, how %d", sock, sk, how); 2061 2062 if (!sk) 2063 return 0; 2064 2065 sock_hold(sk); 2066 lock_sock(sk); 2067 2068 switch (how) { 2069 case SHUT_RD: 2070 if (sk->sk_shutdown & RCV_SHUTDOWN) 2071 goto unlock; 2072 sk->sk_shutdown |= RCV_SHUTDOWN; 2073 break; 2074 case SHUT_WR: 2075 if (sk->sk_shutdown & SEND_SHUTDOWN) 2076 goto unlock; 2077 sk->sk_shutdown |= SEND_SHUTDOWN; 2078 break; 2079 case SHUT_RDWR: 2080 if (sk->sk_shutdown & SHUTDOWN_MASK) 2081 goto unlock; 2082 sk->sk_shutdown |= SHUTDOWN_MASK; 2083 break; 2084 } 2085 2086 iso_sock_clear_timer(sk); 2087 __iso_sock_close(sk); 2088 2089 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime && 2090 !(current->flags & PF_EXITING)) 2091 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime); 2092 2093 unlock: 2094 release_sock(sk); 2095 sock_put(sk); 2096 2097 return err; 2098 } 2099 2100 static int iso_sock_release(struct socket *sock) 2101 { 2102 struct sock *sk = sock->sk; 2103 int err = 0; 2104 2105 BT_DBG("sock %p, sk %p", sock, sk); 2106 2107 if (!sk) 2108 return 0; 2109 2110 iso_sock_close(sk); 2111 2112 if (sock_flag(sk, SOCK_LINGER) && READ_ONCE(sk->sk_lingertime) && 2113 !(current->flags & PF_EXITING)) { 2114 lock_sock(sk); 2115 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime); 2116 release_sock(sk); 2117 } 2118 2119 /* Make sure sk is valid even if iso_conn_del() is concurrent */ 2120 sock_hold(sk); 2121 2122 lock_sock(sk); 2123 sock_orphan(sk); 2124 release_sock(sk); 2125 2126 iso_sock_kill(sk); 2127 2128 sock_put(sk); 2129 return err; 2130 } 2131 2132 static void iso_sock_ready(struct sock *sk) 2133 { 2134 BT_DBG("sk %p", sk); 2135 2136 lockdep_assert(lockdep_sock_is_held(sk)); 2137 2138 switch (sk->sk_state) { 2139 case BT_DISCONN: 2140 case BT_CLOSED: 2141 return; 2142 } 2143 2144 iso_sock_clear_timer(sk); 2145 sk->sk_state = BT_CONNECTED; 2146 sk->sk_state_change(sk); 2147 } 2148 2149 static bool iso_match_big(struct sock *sk, void *data) 2150 { 2151 struct hci_evt_le_big_sync_established *ev = data; 2152 2153 return ev->handle == iso_pi(sk)->qos.bcast.big; 2154 } 2155 2156 static bool iso_match_big_hcon(struct sock *sk, void *data) 2157 { 2158 struct hci_conn *hcon = data; 2159 2160 return hcon->iso_qos.bcast.big == iso_pi(sk)->qos.bcast.big; 2161 } 2162 2163 static bool iso_match_pa_sync_flag(struct sock *sk, void *data) 2164 { 2165 return test_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags); 2166 } 2167 2168 static bool iso_match_dst(struct sock *sk, void *data) 2169 { 2170 return !bacmp(&iso_pi(sk)->dst, (bdaddr_t *)data); 2171 } 2172 2173 static void iso_conn_ready(struct iso_conn *conn) 2174 { 2175 struct sock *parent = NULL; 2176 struct sock *sk; 2177 struct hci_ev_le_big_sync_established *ev = NULL; 2178 struct hci_ev_le_pa_sync_established *ev2 = NULL; 2179 struct hci_ev_le_per_adv_report *ev3 = NULL; 2180 struct hci_conn *hcon; 2181 struct hci_dev *hdev; 2182 2183 BT_DBG("conn %p", conn); 2184 2185 iso_conn_lock(conn); 2186 sk = iso_sock_hold(conn); 2187 iso_conn_unlock(conn); 2188 2189 if (sk) { 2190 lock_sock(sk); 2191 2192 /* conn->sk may have become NULL if racing with sk close, but 2193 * due to held hdev->lock, it can't become different sk. 2194 */ 2195 if (!conn->sk) { 2196 release_sock(sk); 2197 sock_put(sk); 2198 return; 2199 } 2200 2201 /* Attempt to update source address in case of BIS Sender if 2202 * the advertisement is using a random address. 2203 */ 2204 if (conn->hcon->type == BIS_LINK && 2205 conn->hcon->role == HCI_ROLE_MASTER && 2206 !bacmp(&conn->hcon->dst, BDADDR_ANY)) { 2207 struct hci_conn *bis = conn->hcon; 2208 struct adv_info *adv; 2209 2210 adv = hci_find_adv_instance(bis->hdev, 2211 bis->iso_qos.bcast.bis); 2212 if (adv && bacmp(&adv->random_addr, BDADDR_ANY)) { 2213 iso_pi(sk)->src_type = BDADDR_LE_RANDOM; 2214 bacpy(&iso_pi(sk)->src, &adv->random_addr); 2215 } 2216 } 2217 2218 iso_sock_ready(sk); 2219 2220 release_sock(sk); 2221 sock_put(sk); 2222 } else { 2223 hcon = conn->hcon; 2224 if (!hcon) 2225 return; 2226 2227 hdev = hcon->hdev; 2228 2229 if (test_bit(HCI_CONN_BIG_SYNC, &hcon->flags)) { 2230 /* A BIS slave hcon is notified to the ISO layer 2231 * after the Command Complete for the LE Setup 2232 * ISO Data Path command is received. Get the 2233 * parent socket that matches the hcon BIG handle. 2234 */ 2235 parent = iso_get_sock(hdev, &hcon->src, &hcon->dst, 2236 BT_LISTEN, iso_match_big_hcon, 2237 hcon); 2238 } else if (test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags)) { 2239 ev = hci_recv_event_data(hcon->hdev, 2240 HCI_EVT_LE_BIG_SYNC_ESTABLISHED); 2241 2242 /* Get reference to PA sync parent socket, if it exists */ 2243 parent = iso_get_sock(hdev, &hcon->src, &hcon->dst, 2244 BT_LISTEN, 2245 iso_match_pa_sync_flag, 2246 NULL); 2247 if (!parent && ev) 2248 parent = iso_get_sock(hdev, &hcon->src, 2249 &hcon->dst, 2250 BT_LISTEN, 2251 iso_match_big, ev); 2252 } else if (test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) { 2253 ev2 = hci_recv_event_data(hcon->hdev, 2254 HCI_EV_LE_PA_SYNC_ESTABLISHED); 2255 if (ev2) 2256 parent = iso_get_sock(hdev, &hcon->src, 2257 &hcon->dst, 2258 BT_LISTEN, 2259 iso_match_sid, ev2); 2260 } else if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) { 2261 ev3 = hci_recv_event_data(hcon->hdev, 2262 HCI_EV_LE_PER_ADV_REPORT); 2263 if (ev3) 2264 parent = iso_get_sock(hdev, &hcon->src, 2265 &hcon->dst, 2266 BT_LISTEN, 2267 iso_match_sync_handle_pa_report, 2268 ev3); 2269 } 2270 2271 if (!parent) 2272 parent = iso_get_sock(hdev, &hcon->src, BDADDR_ANY, 2273 BT_LISTEN, iso_match_dst, BDADDR_ANY); 2274 2275 if (!parent) 2276 return; 2277 2278 lock_sock(parent); 2279 2280 sk = iso_sock_alloc(sock_net(parent), NULL, 2281 BTPROTO_ISO, GFP_ATOMIC, 0); 2282 if (!sk) { 2283 release_sock(parent); 2284 return; 2285 } 2286 2287 iso_sock_init(sk, parent); 2288 2289 bacpy(&iso_pi(sk)->src, &hcon->src); 2290 2291 /* Convert from HCI to three-value type */ 2292 if (hcon->src_type == ADDR_LE_DEV_PUBLIC) 2293 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC; 2294 else 2295 iso_pi(sk)->src_type = BDADDR_LE_RANDOM; 2296 2297 /* If hcon has no destination address (BDADDR_ANY) it means it 2298 * was created by HCI_EV_LE_BIG_SYNC_ESTABILISHED or 2299 * HCI_EV_LE_PA_SYNC_ESTABLISHED so we need to initialize using 2300 * the parent socket destination address. 2301 */ 2302 if (!bacmp(&hcon->dst, BDADDR_ANY)) { 2303 bacpy(&hcon->dst, &iso_pi(parent)->dst); 2304 hcon->dst_type = le_addr_type(iso_pi(parent)->dst_type); 2305 } 2306 2307 if (test_bit(HCI_CONN_PA_SYNC, &hcon->flags)) { 2308 iso_pi(sk)->qos = iso_pi(parent)->qos; 2309 hcon->iso_qos = iso_pi(sk)->qos; 2310 iso_pi(sk)->bc_sid = iso_pi(parent)->bc_sid; 2311 iso_pi(sk)->bc_num_bis = iso_pi(parent)->bc_num_bis; 2312 memcpy(iso_pi(sk)->bc_bis, iso_pi(parent)->bc_bis, 2313 ISO_MAX_NUM_BIS); 2314 set_bit(BT_SK_PA_SYNC, &iso_pi(sk)->flags); 2315 } 2316 2317 bacpy(&iso_pi(sk)->dst, &hcon->dst); 2318 2319 /* Convert from HCI to three-value type */ 2320 if (hcon->dst_type == ADDR_LE_DEV_PUBLIC) 2321 iso_pi(sk)->dst_type = BDADDR_LE_PUBLIC; 2322 else 2323 iso_pi(sk)->dst_type = BDADDR_LE_RANDOM; 2324 2325 iso_pi(sk)->sync_handle = iso_pi(parent)->sync_handle; 2326 memcpy(iso_pi(sk)->base, iso_pi(parent)->base, iso_pi(parent)->base_len); 2327 iso_pi(sk)->base_len = iso_pi(parent)->base_len; 2328 2329 hci_conn_hold(hcon); 2330 iso_chan_add(conn, sk, parent); 2331 2332 if ((ev && ((struct hci_evt_le_big_sync_established *)ev)->status) || 2333 (ev2 && ev2->status)) { 2334 /* Trigger error signal on child socket */ 2335 sk->sk_err = ECONNREFUSED; 2336 sk->sk_error_report(sk); 2337 } 2338 2339 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) 2340 sk->sk_state = BT_CONNECT2; 2341 else 2342 sk->sk_state = BT_CONNECTED; 2343 2344 /* Wake up parent */ 2345 parent->sk_data_ready(parent); 2346 2347 release_sock(parent); 2348 sock_put(parent); 2349 } 2350 } 2351 2352 static bool iso_match_sid(struct sock *sk, void *data) 2353 { 2354 struct hci_ev_le_pa_sync_established *ev = data; 2355 2356 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID) 2357 return true; 2358 2359 return ev->sid == iso_pi(sk)->bc_sid; 2360 } 2361 2362 static bool iso_match_sid_past(struct sock *sk, void *data) 2363 { 2364 struct hci_ev_le_past_received *ev = data; 2365 2366 if (iso_pi(sk)->bc_sid == HCI_SID_INVALID) 2367 return true; 2368 2369 return ev->sid == iso_pi(sk)->bc_sid; 2370 } 2371 2372 static bool iso_match_sync_handle(struct sock *sk, void *data) 2373 { 2374 struct hci_evt_le_big_info_adv_report *ev = data; 2375 2376 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle; 2377 } 2378 2379 static bool iso_match_sync_handle_pa_report(struct sock *sk, void *data) 2380 { 2381 struct hci_ev_le_per_adv_report *ev = data; 2382 2383 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle; 2384 } 2385 2386 /* ----- ISO interface with lower layer (HCI) ----- */ 2387 2388 int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags) 2389 { 2390 struct hci_ev_le_pa_sync_established *ev1; 2391 struct hci_ev_le_past_received *ev1a; 2392 struct hci_evt_le_big_info_adv_report *ev2; 2393 struct hci_ev_le_per_adv_report *ev3; 2394 struct sock *sk; 2395 2396 bt_dev_dbg(hdev, "bdaddr %pMR", bdaddr); 2397 2398 /* Broadcast receiver requires handling of some events before it can 2399 * proceed to establishing a BIG sync: 2400 * 2401 * 1. HCI_EV_LE_PA_SYNC_ESTABLISHED: The socket may specify a specific 2402 * SID to listen to and once sync is established its handle needs to 2403 * be stored in iso_pi(sk)->sync_handle so it can be matched once 2404 * receiving the BIG Info. 2405 * 1a. HCI_EV_LE_PAST_RECEIVED: alternative to 1. 2406 * 2. HCI_EVT_LE_BIG_INFO_ADV_REPORT: When connect_ind is triggered by a 2407 * a BIG Info it attempts to check if there any listening socket with 2408 * the same sync_handle and if it does then attempt to create a sync. 2409 * 3. HCI_EV_LE_PER_ADV_REPORT: When a PA report is received, it is stored 2410 * in iso_pi(sk)->base so it can be passed up to user, in the case of a 2411 * broadcast sink. 2412 */ 2413 ev1 = hci_recv_event_data(hdev, HCI_EV_LE_PA_SYNC_ESTABLISHED); 2414 if (ev1) { 2415 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN, 2416 iso_match_sid, ev1); 2417 if (sk && !ev1->status) { 2418 lock_sock(sk); 2419 iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle); 2420 iso_pi(sk)->bc_sid = ev1->sid; 2421 release_sock(sk); 2422 } 2423 2424 goto done; 2425 } 2426 2427 ev1a = hci_recv_event_data(hdev, HCI_EV_LE_PAST_RECEIVED); 2428 if (ev1a) { 2429 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN, 2430 iso_match_sid_past, ev1a); 2431 if (sk && !ev1a->status) { 2432 lock_sock(sk); 2433 iso_pi(sk)->sync_handle = le16_to_cpu(ev1a->sync_handle); 2434 iso_pi(sk)->bc_sid = ev1a->sid; 2435 release_sock(sk); 2436 } 2437 2438 goto done; 2439 } 2440 2441 ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT); 2442 if (ev2) { 2443 /* Check if BIGInfo report has already been handled */ 2444 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_CONNECTED, 2445 iso_match_sync_handle, ev2); 2446 if (sk) { 2447 sock_put(sk); 2448 sk = NULL; 2449 goto done; 2450 } 2451 2452 /* Try to get PA sync socket, if it exists */ 2453 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_CONNECT2, 2454 iso_match_sync_handle, ev2); 2455 if (!sk) 2456 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, 2457 BT_LISTEN, 2458 iso_match_sync_handle, 2459 ev2); 2460 2461 if (sk) { 2462 int err = 0; 2463 bool big_sync; 2464 struct hci_conn *hcon; 2465 2466 lock_sock(sk); 2467 2468 hcon = iso_pi(sk)->conn ? iso_pi(sk)->conn->hcon : NULL; 2469 iso_pi(sk)->qos.bcast.encryption = ev2->encryption; 2470 2471 if (ev2->num_bis < iso_pi(sk)->bc_num_bis) 2472 iso_pi(sk)->bc_num_bis = ev2->num_bis; 2473 2474 big_sync = !test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags) && 2475 !test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags); 2476 2477 if (big_sync) 2478 err = hci_conn_big_create_sync(hdev, hcon, 2479 &iso_pi(sk)->qos, 2480 iso_pi(sk)->sync_handle, 2481 iso_pi(sk)->bc_num_bis, 2482 iso_pi(sk)->bc_bis); 2483 2484 release_sock(sk); 2485 2486 if (big_sync && err) { 2487 bt_dev_err(hdev, "hci_le_big_create_sync: %d", 2488 err); 2489 sock_put(sk); 2490 sk = NULL; 2491 } 2492 } 2493 2494 goto done; 2495 } 2496 2497 ev3 = hci_recv_event_data(hdev, HCI_EV_LE_PER_ADV_REPORT); 2498 if (ev3) { 2499 size_t base_len = 0; 2500 u8 *base; 2501 struct hci_conn *hcon; 2502 2503 sk = iso_get_sock(hdev, &hdev->bdaddr, bdaddr, BT_LISTEN, 2504 iso_match_sync_handle_pa_report, ev3); 2505 if (!sk) 2506 goto done; 2507 2508 lock_sock(sk); 2509 2510 hcon = iso_pi(sk)->conn ? iso_pi(sk)->conn->hcon : NULL; 2511 if (!hcon) 2512 goto release3; 2513 2514 if (ev3->data_status == LE_PA_DATA_TRUNCATED) { 2515 /* The controller was unable to retrieve PA data. */ 2516 memset(hcon->le_per_adv_data, 0, 2517 HCI_MAX_PER_AD_TOT_LEN); 2518 hcon->le_per_adv_data_len = 0; 2519 hcon->le_per_adv_data_offset = 0; 2520 goto release3; 2521 } 2522 2523 if (hcon->le_per_adv_data_offset + ev3->length > 2524 HCI_MAX_PER_AD_TOT_LEN) 2525 goto release3; 2526 2527 memcpy(hcon->le_per_adv_data + hcon->le_per_adv_data_offset, 2528 ev3->data, ev3->length); 2529 hcon->le_per_adv_data_offset += ev3->length; 2530 2531 if (ev3->data_status == LE_PA_DATA_COMPLETE) { 2532 /* All PA data has been received. */ 2533 hcon->le_per_adv_data_len = 2534 hcon->le_per_adv_data_offset; 2535 hcon->le_per_adv_data_offset = 0; 2536 2537 /* Extract BASE */ 2538 base = eir_get_service_data(hcon->le_per_adv_data, 2539 hcon->le_per_adv_data_len, 2540 EIR_BAA_SERVICE_UUID, 2541 &base_len); 2542 2543 if (!base || base_len > BASE_MAX_LENGTH) 2544 goto release3; 2545 2546 memcpy(iso_pi(sk)->base, base, base_len); 2547 iso_pi(sk)->base_len = base_len; 2548 } else { 2549 /* This is a PA data fragment. Keep pa_data_len set to 0 2550 * until all data has been reassembled. 2551 */ 2552 hcon->le_per_adv_data_len = 0; 2553 } 2554 2555 release3: 2556 release_sock(sk); 2557 } else { 2558 sk = iso_get_sock(hdev, &hdev->bdaddr, BDADDR_ANY, 2559 BT_LISTEN, iso_match_dst, BDADDR_ANY); 2560 } 2561 2562 done: 2563 if (!sk) 2564 return 0; 2565 2566 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) 2567 *flags |= HCI_PROTO_DEFER; 2568 2569 sock_put(sk); 2570 2571 return HCI_LM_ACCEPT; 2572 } 2573 2574 static void iso_connect_cfm(struct hci_conn *hcon, __u8 status) 2575 __must_hold(&hcon->hdev->lock) 2576 { 2577 if (hcon->type != CIS_LINK && hcon->type != BIS_LINK && 2578 hcon->type != PA_LINK) { 2579 if (hcon->type != LE_LINK) 2580 return; 2581 2582 /* Check if LE link has failed */ 2583 if (status) { 2584 struct hci_link *link, *t; 2585 2586 list_for_each_entry_safe(link, t, &hcon->link_list, 2587 list) { 2588 lockdep_assert_held(&link->conn->hdev->lock); 2589 iso_conn_del(link->conn, bt_to_errno(status)); 2590 } 2591 2592 return; 2593 } 2594 2595 /* Create CIS if pending */ 2596 hci_le_create_cis_pending(hcon->hdev); 2597 return; 2598 } 2599 2600 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); 2601 2602 /* Similar to the success case, if HCI_CONN_BIG_SYNC_FAILED or 2603 * HCI_CONN_PA_SYNC_FAILED is set, queue the failed connection 2604 * into the accept queue of the listening socket and wake up 2605 * userspace, to inform the user about the event. 2606 */ 2607 if (!status || test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags) || 2608 test_bit(HCI_CONN_PA_SYNC_FAILED, &hcon->flags)) { 2609 struct iso_conn *conn; 2610 2611 conn = iso_conn_add(hcon); 2612 if (conn) { 2613 iso_conn_ready(conn); 2614 iso_conn_put(conn); 2615 } 2616 } else { 2617 iso_conn_del(hcon, bt_to_errno(status)); 2618 } 2619 } 2620 2621 static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason) 2622 __must_hold(&hcon->hdev->lock) 2623 { 2624 if (hcon->type != CIS_LINK && hcon->type != BIS_LINK && 2625 hcon->type != PA_LINK) 2626 return; 2627 2628 BT_DBG("hcon %p reason %d", hcon, reason); 2629 2630 iso_conn_del(hcon, bt_to_errno(reason)); 2631 } 2632 2633 int iso_recv(struct hci_dev *hdev, u16 handle, struct sk_buff *skb, u16 flags) 2634 { 2635 struct hci_conn *hcon; 2636 struct iso_conn *conn; 2637 struct skb_shared_hwtstamps *hwts; 2638 __u16 pb, ts, len, sn; 2639 2640 hci_dev_lock(hdev); 2641 2642 hcon = hci_conn_hash_lookup_handle(hdev, handle); 2643 if (!hcon) { 2644 hci_dev_unlock(hdev); 2645 kfree_skb(skb); 2646 return -ENOENT; 2647 } 2648 2649 spin_lock(&hcon->proto_lock); 2650 conn = iso_conn_hold_unless_zero(hcon->iso_data); 2651 spin_unlock(&hcon->proto_lock); 2652 2653 hcon = NULL; 2654 2655 hci_dev_unlock(hdev); 2656 2657 if (!conn) { 2658 kfree_skb(skb); 2659 return -EINVAL; 2660 } 2661 2662 pb = hci_iso_flags_pb(flags); 2663 ts = hci_iso_flags_ts(flags); 2664 2665 BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts); 2666 2667 switch (pb) { 2668 case ISO_START: 2669 case ISO_SINGLE: 2670 if (conn->rx_skb || conn->rx_len) { 2671 BT_ERR("Unexpected start frame (len %d)", skb->len); 2672 kfree_skb(conn->rx_skb); 2673 conn->rx_skb = NULL; 2674 conn->rx_len = 0; 2675 } 2676 2677 if (ts) { 2678 struct hci_iso_ts_data_hdr *hdr; 2679 2680 hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE); 2681 if (!hdr) { 2682 BT_ERR("Frame is too short (len %d)", skb->len); 2683 goto drop; 2684 } 2685 2686 /* Record the timestamp to skb */ 2687 hwts = skb_hwtstamps(skb); 2688 hwts->hwtstamp = us_to_ktime(le32_to_cpu(hdr->ts)); 2689 2690 sn = __le16_to_cpu(hdr->sn); 2691 len = __le16_to_cpu(hdr->slen); 2692 } else { 2693 struct hci_iso_data_hdr *hdr; 2694 2695 hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE); 2696 if (!hdr) { 2697 BT_ERR("Frame is too short (len %d)", skb->len); 2698 goto drop; 2699 } 2700 2701 sn = __le16_to_cpu(hdr->sn); 2702 len = __le16_to_cpu(hdr->slen); 2703 } 2704 2705 flags = hci_iso_data_flags(len); 2706 len = hci_iso_data_len(len); 2707 2708 BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x sn %d", 2709 len, skb->len, flags, sn); 2710 2711 if (len == skb->len) { 2712 /* Complete frame received */ 2713 hci_skb_pkt_status(skb) = flags & 0x03; 2714 hci_skb_pkt_seqnum(skb) = sn; 2715 iso_recv_frame(conn, skb); 2716 goto done; 2717 } 2718 2719 if (pb == ISO_SINGLE) { 2720 BT_ERR("Frame malformed (len %d, expected len %d)", 2721 skb->len, len); 2722 goto drop; 2723 } 2724 2725 if (skb->len > len) { 2726 BT_ERR("Frame is too long (len %d, expected len %d)", 2727 skb->len, len); 2728 goto drop; 2729 } 2730 2731 /* Allocate skb for the complete frame (with header) */ 2732 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL); 2733 if (!conn->rx_skb) 2734 goto drop; 2735 2736 hci_skb_pkt_status(conn->rx_skb) = flags & 0x03; 2737 hci_skb_pkt_seqnum(conn->rx_skb) = sn; 2738 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 2739 skb->len); 2740 conn->rx_len = len - skb->len; 2741 2742 /* Copy hw timestamp from skb to rx_skb if present */ 2743 if (ts) { 2744 hwts = skb_hwtstamps(conn->rx_skb); 2745 hwts->hwtstamp = skb_hwtstamps(skb)->hwtstamp; 2746 } 2747 2748 break; 2749 2750 case ISO_CONT: 2751 case ISO_END: 2752 BT_DBG("%s: frag len %d (expecting %d)", 2753 (pb == ISO_END) ? "End" : "Cont", skb->len, 2754 conn->rx_len); 2755 2756 if (!conn->rx_skb) { 2757 BT_ERR("Unexpected ISO %s frame (len %d)", 2758 (pb == ISO_END) ? "End" : "Cont", skb->len); 2759 goto drop; 2760 } 2761 2762 if (skb->len > conn->rx_len) { 2763 BT_ERR("Fragment is too long (len %d, expected %d)", 2764 skb->len, conn->rx_len); 2765 kfree_skb(conn->rx_skb); 2766 conn->rx_skb = NULL; 2767 conn->rx_len = 0; 2768 goto drop; 2769 } 2770 2771 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), 2772 skb->len); 2773 conn->rx_len -= skb->len; 2774 2775 if (pb == ISO_CONT) 2776 break; 2777 2778 if (!conn->rx_len) { 2779 struct sk_buff *rx_skb = conn->rx_skb; 2780 2781 /* Complete frame received. iso_recv_frame 2782 * takes ownership of the skb so set the global 2783 * rx_skb pointer to NULL first. 2784 */ 2785 conn->rx_skb = NULL; 2786 iso_recv_frame(conn, rx_skb); 2787 } else { 2788 BT_ERR("ISO fragment incomplete (len %d, expected %d)", 2789 skb->len, conn->rx_len); 2790 kfree_skb(conn->rx_skb); 2791 conn->rx_skb = NULL; 2792 conn->rx_len = 0; 2793 goto drop; 2794 } 2795 break; 2796 } 2797 2798 drop: 2799 kfree_skb(skb); 2800 done: 2801 iso_conn_put(conn); 2802 return 0; 2803 } 2804 2805 static struct hci_cb iso_cb = { 2806 .name = "ISO", 2807 .connect_cfm = iso_connect_cfm, 2808 .disconn_cfm = iso_disconn_cfm, 2809 }; 2810 2811 static int iso_debugfs_show(struct seq_file *f, void *p) 2812 { 2813 struct sock *sk; 2814 2815 read_lock(&iso_sk_list.lock); 2816 2817 sk_for_each(sk, &iso_sk_list.head) { 2818 seq_printf(f, "%pMR %pMR %d\n", &iso_pi(sk)->src, 2819 &iso_pi(sk)->dst, sk->sk_state); 2820 } 2821 2822 read_unlock(&iso_sk_list.lock); 2823 2824 return 0; 2825 } 2826 2827 DEFINE_SHOW_ATTRIBUTE(iso_debugfs); 2828 2829 static struct dentry *iso_debugfs; 2830 2831 static const struct proto_ops iso_sock_ops = { 2832 .family = PF_BLUETOOTH, 2833 .owner = THIS_MODULE, 2834 .release = iso_sock_release, 2835 .bind = iso_sock_bind, 2836 .connect = iso_sock_connect, 2837 .listen = iso_sock_listen, 2838 .accept = iso_sock_accept, 2839 .getname = iso_sock_getname, 2840 .sendmsg = iso_sock_sendmsg, 2841 .recvmsg = iso_sock_recvmsg, 2842 .poll = bt_sock_poll, 2843 .ioctl = bt_sock_ioctl, 2844 .mmap = sock_no_mmap, 2845 .socketpair = sock_no_socketpair, 2846 .shutdown = iso_sock_shutdown, 2847 .setsockopt = iso_sock_setsockopt, 2848 .getsockopt_iter = iso_sock_getsockopt 2849 }; 2850 2851 static const struct net_proto_family iso_sock_family_ops = { 2852 .family = PF_BLUETOOTH, 2853 .owner = THIS_MODULE, 2854 .create = iso_sock_create, 2855 }; 2856 2857 static bool inited; 2858 2859 bool iso_inited(void) 2860 { 2861 return inited; 2862 } 2863 2864 int iso_init(void) 2865 { 2866 int err; 2867 2868 BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr)); 2869 2870 if (inited) 2871 return -EALREADY; 2872 2873 err = proto_register(&iso_proto, 0); 2874 if (err < 0) 2875 return err; 2876 2877 err = bt_sock_register(BTPROTO_ISO, &iso_sock_family_ops); 2878 if (err < 0) { 2879 BT_ERR("ISO socket registration failed"); 2880 goto error; 2881 } 2882 2883 err = bt_procfs_init(&init_net, "iso", &iso_sk_list, NULL); 2884 if (err < 0) { 2885 BT_ERR("Failed to create ISO proc file"); 2886 bt_sock_unregister(BTPROTO_ISO); 2887 goto error; 2888 } 2889 2890 BT_INFO("ISO socket layer initialized"); 2891 2892 hci_register_cb(&iso_cb); 2893 2894 if (!IS_ERR_OR_NULL(bt_debugfs)) 2895 iso_debugfs = debugfs_create_file("iso", 0444, bt_debugfs, 2896 NULL, &iso_debugfs_fops); 2897 2898 inited = true; 2899 2900 return 0; 2901 2902 error: 2903 proto_unregister(&iso_proto); 2904 return err; 2905 } 2906 2907 int iso_exit(void) 2908 { 2909 if (!inited) 2910 return -EALREADY; 2911 2912 bt_procfs_cleanup(&init_net, "iso"); 2913 2914 debugfs_remove(iso_debugfs); 2915 iso_debugfs = NULL; 2916 2917 hci_unregister_cb(&iso_cb); 2918 2919 bt_sock_unregister(BTPROTO_ISO); 2920 2921 proto_unregister(&iso_proto); 2922 2923 inited = false; 2924 2925 return 0; 2926 } 2927