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