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