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