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