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 /* Close not yet accepted channels */ 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 } 834 835 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 */ 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 } 883 884 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 } 913 914 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. */ 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 } 959 960 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 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 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 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. */ 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 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. */ 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 2198 static bool iso_match_dst(struct sock *sk, void *data) 2199 { 2200 return !bacmp(&iso_pi(sk)->dst, (bdaddr_t *)data); 2201 } 2202 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 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 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 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 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 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 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 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 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 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 2898 bool iso_inited(void) 2899 { 2900 return inited; 2901 } 2902 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 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