1 /* 2 BlueZ - Bluetooth protocol stack for Linux 3 Copyright (C) 2000-2001 Qualcomm Incorporated 4 5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License version 2 as 9 published by the Free Software Foundation; 10 11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 22 SOFTWARE IS DISCLAIMED. 23 */ 24 25 /* Bluetooth SCO sockets. */ 26 27 #include <linux/module.h> 28 #include <linux/debugfs.h> 29 #include <linux/seq_file.h> 30 #include <linux/sched/signal.h> 31 32 #include <net/bluetooth/bluetooth.h> 33 #include <net/bluetooth/hci_core.h> 34 #include <net/bluetooth/sco.h> 35 36 static bool disable_esco; 37 38 static const struct proto_ops sco_sock_ops; 39 40 static struct bt_sock_list sco_sk_list = { 41 .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock) 42 }; 43 44 /* ---- SCO connections ---- */ 45 struct sco_conn { 46 struct hci_conn *hcon; 47 48 spinlock_t lock; 49 struct sock *sk; 50 51 unsigned int mtu; 52 }; 53 54 #define sco_conn_lock(c) spin_lock(&c->lock); 55 #define sco_conn_unlock(c) spin_unlock(&c->lock); 56 57 static void sco_sock_close(struct sock *sk); 58 static void sco_sock_kill(struct sock *sk); 59 60 /* ----- SCO socket info ----- */ 61 #define sco_pi(sk) ((struct sco_pinfo *) sk) 62 63 struct sco_pinfo { 64 struct bt_sock bt; 65 bdaddr_t src; 66 bdaddr_t dst; 67 __u32 flags; 68 __u16 setting; 69 struct sco_conn *conn; 70 }; 71 72 /* ---- SCO timers ---- */ 73 #define SCO_CONN_TIMEOUT (HZ * 40) 74 #define SCO_DISCONN_TIMEOUT (HZ * 2) 75 76 static void sco_sock_timeout(unsigned long arg) 77 { 78 struct sock *sk = (struct sock *)arg; 79 80 BT_DBG("sock %p state %d", sk, sk->sk_state); 81 82 bh_lock_sock(sk); 83 sk->sk_err = ETIMEDOUT; 84 sk->sk_state_change(sk); 85 bh_unlock_sock(sk); 86 87 sco_sock_kill(sk); 88 sock_put(sk); 89 } 90 91 static void sco_sock_set_timer(struct sock *sk, long timeout) 92 { 93 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout); 94 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); 95 } 96 97 static void sco_sock_clear_timer(struct sock *sk) 98 { 99 BT_DBG("sock %p state %d", sk, sk->sk_state); 100 sk_stop_timer(sk, &sk->sk_timer); 101 } 102 103 /* ---- SCO connections ---- */ 104 static struct sco_conn *sco_conn_add(struct hci_conn *hcon) 105 { 106 struct hci_dev *hdev = hcon->hdev; 107 struct sco_conn *conn = hcon->sco_data; 108 109 if (conn) 110 return conn; 111 112 conn = kzalloc(sizeof(struct sco_conn), GFP_KERNEL); 113 if (!conn) 114 return NULL; 115 116 spin_lock_init(&conn->lock); 117 118 hcon->sco_data = conn; 119 conn->hcon = hcon; 120 121 if (hdev->sco_mtu > 0) 122 conn->mtu = hdev->sco_mtu; 123 else 124 conn->mtu = 60; 125 126 BT_DBG("hcon %p conn %p", hcon, conn); 127 128 return conn; 129 } 130 131 /* Delete channel. 132 * Must be called on the locked socket. */ 133 static void sco_chan_del(struct sock *sk, int err) 134 { 135 struct sco_conn *conn; 136 137 conn = sco_pi(sk)->conn; 138 139 BT_DBG("sk %p, conn %p, err %d", sk, conn, err); 140 141 if (conn) { 142 sco_conn_lock(conn); 143 conn->sk = NULL; 144 sco_pi(sk)->conn = NULL; 145 sco_conn_unlock(conn); 146 147 if (conn->hcon) 148 hci_conn_drop(conn->hcon); 149 } 150 151 sk->sk_state = BT_CLOSED; 152 sk->sk_err = err; 153 sk->sk_state_change(sk); 154 155 sock_set_flag(sk, SOCK_ZAPPED); 156 } 157 158 static void sco_conn_del(struct hci_conn *hcon, int err) 159 { 160 struct sco_conn *conn = hcon->sco_data; 161 struct sock *sk; 162 163 if (!conn) 164 return; 165 166 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); 167 168 /* Kill socket */ 169 sco_conn_lock(conn); 170 sk = conn->sk; 171 sco_conn_unlock(conn); 172 173 if (sk) { 174 sock_hold(sk); 175 bh_lock_sock(sk); 176 sco_sock_clear_timer(sk); 177 sco_chan_del(sk, err); 178 bh_unlock_sock(sk); 179 sco_sock_kill(sk); 180 sock_put(sk); 181 } 182 183 hcon->sco_data = NULL; 184 kfree(conn); 185 } 186 187 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, 188 struct sock *parent) 189 { 190 BT_DBG("conn %p", conn); 191 192 sco_pi(sk)->conn = conn; 193 conn->sk = sk; 194 195 if (parent) 196 bt_accept_enqueue(parent, sk); 197 } 198 199 static int sco_chan_add(struct sco_conn *conn, struct sock *sk, 200 struct sock *parent) 201 { 202 int err = 0; 203 204 sco_conn_lock(conn); 205 if (conn->sk) 206 err = -EBUSY; 207 else 208 __sco_chan_add(conn, sk, parent); 209 210 sco_conn_unlock(conn); 211 return err; 212 } 213 214 static int sco_connect(struct sock *sk) 215 { 216 struct sco_conn *conn; 217 struct hci_conn *hcon; 218 struct hci_dev *hdev; 219 int err, type; 220 221 BT_DBG("%pMR -> %pMR", &sco_pi(sk)->src, &sco_pi(sk)->dst); 222 223 hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src, BDADDR_BREDR); 224 if (!hdev) 225 return -EHOSTUNREACH; 226 227 hci_dev_lock(hdev); 228 229 if (lmp_esco_capable(hdev) && !disable_esco) 230 type = ESCO_LINK; 231 else 232 type = SCO_LINK; 233 234 if (sco_pi(sk)->setting == BT_VOICE_TRANSPARENT && 235 (!lmp_transp_capable(hdev) || !lmp_esco_capable(hdev))) { 236 err = -EOPNOTSUPP; 237 goto done; 238 } 239 240 hcon = hci_connect_sco(hdev, type, &sco_pi(sk)->dst, 241 sco_pi(sk)->setting); 242 if (IS_ERR(hcon)) { 243 err = PTR_ERR(hcon); 244 goto done; 245 } 246 247 conn = sco_conn_add(hcon); 248 if (!conn) { 249 hci_conn_drop(hcon); 250 err = -ENOMEM; 251 goto done; 252 } 253 254 /* Update source addr of the socket */ 255 bacpy(&sco_pi(sk)->src, &hcon->src); 256 257 err = sco_chan_add(conn, sk, NULL); 258 if (err) 259 goto done; 260 261 if (hcon->state == BT_CONNECTED) { 262 sco_sock_clear_timer(sk); 263 sk->sk_state = BT_CONNECTED; 264 } else { 265 sk->sk_state = BT_CONNECT; 266 sco_sock_set_timer(sk, sk->sk_sndtimeo); 267 } 268 269 done: 270 hci_dev_unlock(hdev); 271 hci_dev_put(hdev); 272 return err; 273 } 274 275 static int sco_send_frame(struct sock *sk, struct msghdr *msg, int len) 276 { 277 struct sco_conn *conn = sco_pi(sk)->conn; 278 struct sk_buff *skb; 279 int err; 280 281 /* Check outgoing MTU */ 282 if (len > conn->mtu) 283 return -EINVAL; 284 285 BT_DBG("sk %p len %d", sk, len); 286 287 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err); 288 if (!skb) 289 return err; 290 291 if (memcpy_from_msg(skb_put(skb, len), msg, len)) { 292 kfree_skb(skb); 293 return -EFAULT; 294 } 295 296 hci_send_sco(conn->hcon, skb); 297 298 return len; 299 } 300 301 static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb) 302 { 303 struct sock *sk; 304 305 sco_conn_lock(conn); 306 sk = conn->sk; 307 sco_conn_unlock(conn); 308 309 if (!sk) 310 goto drop; 311 312 BT_DBG("sk %p len %d", sk, skb->len); 313 314 if (sk->sk_state != BT_CONNECTED) 315 goto drop; 316 317 if (!sock_queue_rcv_skb(sk, skb)) 318 return; 319 320 drop: 321 kfree_skb(skb); 322 } 323 324 /* -------- Socket interface ---------- */ 325 static struct sock *__sco_get_sock_listen_by_addr(bdaddr_t *ba) 326 { 327 struct sock *sk; 328 329 sk_for_each(sk, &sco_sk_list.head) { 330 if (sk->sk_state != BT_LISTEN) 331 continue; 332 333 if (!bacmp(&sco_pi(sk)->src, ba)) 334 return sk; 335 } 336 337 return NULL; 338 } 339 340 /* Find socket listening on source bdaddr. 341 * Returns closest match. 342 */ 343 static struct sock *sco_get_sock_listen(bdaddr_t *src) 344 { 345 struct sock *sk = NULL, *sk1 = NULL; 346 347 read_lock(&sco_sk_list.lock); 348 349 sk_for_each(sk, &sco_sk_list.head) { 350 if (sk->sk_state != BT_LISTEN) 351 continue; 352 353 /* Exact match. */ 354 if (!bacmp(&sco_pi(sk)->src, src)) 355 break; 356 357 /* Closest match */ 358 if (!bacmp(&sco_pi(sk)->src, BDADDR_ANY)) 359 sk1 = sk; 360 } 361 362 read_unlock(&sco_sk_list.lock); 363 364 return sk ? sk : sk1; 365 } 366 367 static void sco_sock_destruct(struct sock *sk) 368 { 369 BT_DBG("sk %p", sk); 370 371 skb_queue_purge(&sk->sk_receive_queue); 372 skb_queue_purge(&sk->sk_write_queue); 373 } 374 375 static void sco_sock_cleanup_listen(struct sock *parent) 376 { 377 struct sock *sk; 378 379 BT_DBG("parent %p", parent); 380 381 /* Close not yet accepted channels */ 382 while ((sk = bt_accept_dequeue(parent, NULL))) { 383 sco_sock_close(sk); 384 sco_sock_kill(sk); 385 } 386 387 parent->sk_state = BT_CLOSED; 388 sock_set_flag(parent, SOCK_ZAPPED); 389 } 390 391 /* Kill socket (only if zapped and orphan) 392 * Must be called on unlocked socket. 393 */ 394 static void sco_sock_kill(struct sock *sk) 395 { 396 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 397 return; 398 399 BT_DBG("sk %p state %d", sk, sk->sk_state); 400 401 /* Kill poor orphan */ 402 bt_sock_unlink(&sco_sk_list, sk); 403 sock_set_flag(sk, SOCK_DEAD); 404 sock_put(sk); 405 } 406 407 static void __sco_sock_close(struct sock *sk) 408 { 409 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); 410 411 switch (sk->sk_state) { 412 case BT_LISTEN: 413 sco_sock_cleanup_listen(sk); 414 break; 415 416 case BT_CONNECTED: 417 case BT_CONFIG: 418 if (sco_pi(sk)->conn->hcon) { 419 sk->sk_state = BT_DISCONN; 420 sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT); 421 sco_conn_lock(sco_pi(sk)->conn); 422 hci_conn_drop(sco_pi(sk)->conn->hcon); 423 sco_pi(sk)->conn->hcon = NULL; 424 sco_conn_unlock(sco_pi(sk)->conn); 425 } else 426 sco_chan_del(sk, ECONNRESET); 427 break; 428 429 case BT_CONNECT2: 430 case BT_CONNECT: 431 case BT_DISCONN: 432 sco_chan_del(sk, ECONNRESET); 433 break; 434 435 default: 436 sock_set_flag(sk, SOCK_ZAPPED); 437 break; 438 } 439 } 440 441 /* Must be called on unlocked socket. */ 442 static void sco_sock_close(struct sock *sk) 443 { 444 sco_sock_clear_timer(sk); 445 lock_sock(sk); 446 __sco_sock_close(sk); 447 release_sock(sk); 448 sco_sock_kill(sk); 449 } 450 451 static void sco_sock_init(struct sock *sk, struct sock *parent) 452 { 453 BT_DBG("sk %p", sk); 454 455 if (parent) { 456 sk->sk_type = parent->sk_type; 457 bt_sk(sk)->flags = bt_sk(parent)->flags; 458 security_sk_clone(parent, sk); 459 } 460 } 461 462 static struct proto sco_proto = { 463 .name = "SCO", 464 .owner = THIS_MODULE, 465 .obj_size = sizeof(struct sco_pinfo) 466 }; 467 468 static struct sock *sco_sock_alloc(struct net *net, struct socket *sock, 469 int proto, gfp_t prio, int kern) 470 { 471 struct sock *sk; 472 473 sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto, kern); 474 if (!sk) 475 return NULL; 476 477 sock_init_data(sock, sk); 478 INIT_LIST_HEAD(&bt_sk(sk)->accept_q); 479 480 sk->sk_destruct = sco_sock_destruct; 481 sk->sk_sndtimeo = SCO_CONN_TIMEOUT; 482 483 sock_reset_flag(sk, SOCK_ZAPPED); 484 485 sk->sk_protocol = proto; 486 sk->sk_state = BT_OPEN; 487 488 sco_pi(sk)->setting = BT_VOICE_CVSD_16BIT; 489 490 setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk); 491 492 bt_sock_link(&sco_sk_list, sk); 493 return sk; 494 } 495 496 static int sco_sock_create(struct net *net, struct socket *sock, int protocol, 497 int kern) 498 { 499 struct sock *sk; 500 501 BT_DBG("sock %p", sock); 502 503 sock->state = SS_UNCONNECTED; 504 505 if (sock->type != SOCK_SEQPACKET) 506 return -ESOCKTNOSUPPORT; 507 508 sock->ops = &sco_sock_ops; 509 510 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern); 511 if (!sk) 512 return -ENOMEM; 513 514 sco_sock_init(sk, NULL); 515 return 0; 516 } 517 518 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, 519 int addr_len) 520 { 521 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr; 522 struct sock *sk = sock->sk; 523 int err = 0; 524 525 BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr); 526 527 if (!addr || addr_len < sizeof(struct sockaddr_sco) || 528 addr->sa_family != AF_BLUETOOTH) 529 return -EINVAL; 530 531 lock_sock(sk); 532 533 if (sk->sk_state != BT_OPEN) { 534 err = -EBADFD; 535 goto done; 536 } 537 538 if (sk->sk_type != SOCK_SEQPACKET) { 539 err = -EINVAL; 540 goto done; 541 } 542 543 bacpy(&sco_pi(sk)->src, &sa->sco_bdaddr); 544 545 sk->sk_state = BT_BOUND; 546 547 done: 548 release_sock(sk); 549 return err; 550 } 551 552 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) 553 { 554 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr; 555 struct sock *sk = sock->sk; 556 int err; 557 558 BT_DBG("sk %p", sk); 559 560 if (alen < sizeof(struct sockaddr_sco) || 561 addr->sa_family != AF_BLUETOOTH) 562 return -EINVAL; 563 564 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) 565 return -EBADFD; 566 567 if (sk->sk_type != SOCK_SEQPACKET) 568 return -EINVAL; 569 570 lock_sock(sk); 571 572 /* Set destination address and psm */ 573 bacpy(&sco_pi(sk)->dst, &sa->sco_bdaddr); 574 575 err = sco_connect(sk); 576 if (err) 577 goto done; 578 579 err = bt_sock_wait_state(sk, BT_CONNECTED, 580 sock_sndtimeo(sk, flags & O_NONBLOCK)); 581 582 done: 583 release_sock(sk); 584 return err; 585 } 586 587 static int sco_sock_listen(struct socket *sock, int backlog) 588 { 589 struct sock *sk = sock->sk; 590 bdaddr_t *src = &sco_pi(sk)->src; 591 int err = 0; 592 593 BT_DBG("sk %p backlog %d", sk, backlog); 594 595 lock_sock(sk); 596 597 if (sk->sk_state != BT_BOUND) { 598 err = -EBADFD; 599 goto done; 600 } 601 602 if (sk->sk_type != SOCK_SEQPACKET) { 603 err = -EINVAL; 604 goto done; 605 } 606 607 write_lock(&sco_sk_list.lock); 608 609 if (__sco_get_sock_listen_by_addr(src)) { 610 err = -EADDRINUSE; 611 goto unlock; 612 } 613 614 sk->sk_max_ack_backlog = backlog; 615 sk->sk_ack_backlog = 0; 616 617 sk->sk_state = BT_LISTEN; 618 619 unlock: 620 write_unlock(&sco_sk_list.lock); 621 622 done: 623 release_sock(sk); 624 return err; 625 } 626 627 static int sco_sock_accept(struct socket *sock, struct socket *newsock, 628 int flags, bool kern) 629 { 630 DEFINE_WAIT_FUNC(wait, woken_wake_function); 631 struct sock *sk = sock->sk, *ch; 632 long timeo; 633 int err = 0; 634 635 lock_sock(sk); 636 637 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 638 639 BT_DBG("sk %p timeo %ld", sk, timeo); 640 641 /* Wait for an incoming connection. (wake-one). */ 642 add_wait_queue_exclusive(sk_sleep(sk), &wait); 643 while (1) { 644 if (sk->sk_state != BT_LISTEN) { 645 err = -EBADFD; 646 break; 647 } 648 649 ch = bt_accept_dequeue(sk, newsock); 650 if (ch) 651 break; 652 653 if (!timeo) { 654 err = -EAGAIN; 655 break; 656 } 657 658 if (signal_pending(current)) { 659 err = sock_intr_errno(timeo); 660 break; 661 } 662 663 release_sock(sk); 664 665 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); 666 lock_sock(sk); 667 } 668 remove_wait_queue(sk_sleep(sk), &wait); 669 670 if (err) 671 goto done; 672 673 newsock->state = SS_CONNECTED; 674 675 BT_DBG("new socket %p", ch); 676 677 done: 678 release_sock(sk); 679 return err; 680 } 681 682 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, 683 int *len, int peer) 684 { 685 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr; 686 struct sock *sk = sock->sk; 687 688 BT_DBG("sock %p, sk %p", sock, sk); 689 690 addr->sa_family = AF_BLUETOOTH; 691 *len = sizeof(struct sockaddr_sco); 692 693 if (peer) 694 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->dst); 695 else 696 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->src); 697 698 return 0; 699 } 700 701 static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg, 702 size_t len) 703 { 704 struct sock *sk = sock->sk; 705 int err; 706 707 BT_DBG("sock %p, sk %p", sock, sk); 708 709 err = sock_error(sk); 710 if (err) 711 return err; 712 713 if (msg->msg_flags & MSG_OOB) 714 return -EOPNOTSUPP; 715 716 lock_sock(sk); 717 718 if (sk->sk_state == BT_CONNECTED) 719 err = sco_send_frame(sk, msg, len); 720 else 721 err = -ENOTCONN; 722 723 release_sock(sk); 724 return err; 725 } 726 727 static void sco_conn_defer_accept(struct hci_conn *conn, u16 setting) 728 { 729 struct hci_dev *hdev = conn->hdev; 730 731 BT_DBG("conn %p", conn); 732 733 conn->state = BT_CONFIG; 734 735 if (!lmp_esco_capable(hdev)) { 736 struct hci_cp_accept_conn_req cp; 737 738 bacpy(&cp.bdaddr, &conn->dst); 739 cp.role = 0x00; /* Ignored */ 740 741 hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp); 742 } else { 743 struct hci_cp_accept_sync_conn_req cp; 744 745 bacpy(&cp.bdaddr, &conn->dst); 746 cp.pkt_type = cpu_to_le16(conn->pkt_type); 747 748 cp.tx_bandwidth = cpu_to_le32(0x00001f40); 749 cp.rx_bandwidth = cpu_to_le32(0x00001f40); 750 cp.content_format = cpu_to_le16(setting); 751 752 switch (setting & SCO_AIRMODE_MASK) { 753 case SCO_AIRMODE_TRANSP: 754 if (conn->pkt_type & ESCO_2EV3) 755 cp.max_latency = cpu_to_le16(0x0008); 756 else 757 cp.max_latency = cpu_to_le16(0x000D); 758 cp.retrans_effort = 0x02; 759 break; 760 case SCO_AIRMODE_CVSD: 761 cp.max_latency = cpu_to_le16(0xffff); 762 cp.retrans_effort = 0xff; 763 break; 764 } 765 766 hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ, 767 sizeof(cp), &cp); 768 } 769 } 770 771 static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg, 772 size_t len, int flags) 773 { 774 struct sock *sk = sock->sk; 775 struct sco_pinfo *pi = sco_pi(sk); 776 777 lock_sock(sk); 778 779 if (sk->sk_state == BT_CONNECT2 && 780 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) { 781 sco_conn_defer_accept(pi->conn->hcon, pi->setting); 782 sk->sk_state = BT_CONFIG; 783 784 release_sock(sk); 785 return 0; 786 } 787 788 release_sock(sk); 789 790 return bt_sock_recvmsg(sock, msg, len, flags); 791 } 792 793 static int sco_sock_setsockopt(struct socket *sock, int level, int optname, 794 char __user *optval, unsigned int optlen) 795 { 796 struct sock *sk = sock->sk; 797 int len, err = 0; 798 struct bt_voice voice; 799 u32 opt; 800 801 BT_DBG("sk %p", sk); 802 803 lock_sock(sk); 804 805 switch (optname) { 806 807 case BT_DEFER_SETUP: 808 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { 809 err = -EINVAL; 810 break; 811 } 812 813 if (get_user(opt, (u32 __user *) optval)) { 814 err = -EFAULT; 815 break; 816 } 817 818 if (opt) 819 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 820 else 821 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags); 822 break; 823 824 case BT_VOICE: 825 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND && 826 sk->sk_state != BT_CONNECT2) { 827 err = -EINVAL; 828 break; 829 } 830 831 voice.setting = sco_pi(sk)->setting; 832 833 len = min_t(unsigned int, sizeof(voice), optlen); 834 if (copy_from_user((char *)&voice, optval, len)) { 835 err = -EFAULT; 836 break; 837 } 838 839 /* Explicitly check for these values */ 840 if (voice.setting != BT_VOICE_TRANSPARENT && 841 voice.setting != BT_VOICE_CVSD_16BIT) { 842 err = -EINVAL; 843 break; 844 } 845 846 sco_pi(sk)->setting = voice.setting; 847 break; 848 849 default: 850 err = -ENOPROTOOPT; 851 break; 852 } 853 854 release_sock(sk); 855 return err; 856 } 857 858 static int sco_sock_getsockopt_old(struct socket *sock, int optname, 859 char __user *optval, int __user *optlen) 860 { 861 struct sock *sk = sock->sk; 862 struct sco_options opts; 863 struct sco_conninfo cinfo; 864 int len, err = 0; 865 866 BT_DBG("sk %p", sk); 867 868 if (get_user(len, optlen)) 869 return -EFAULT; 870 871 lock_sock(sk); 872 873 switch (optname) { 874 case SCO_OPTIONS: 875 if (sk->sk_state != BT_CONNECTED && 876 !(sk->sk_state == BT_CONNECT2 && 877 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) { 878 err = -ENOTCONN; 879 break; 880 } 881 882 opts.mtu = sco_pi(sk)->conn->mtu; 883 884 BT_DBG("mtu %d", opts.mtu); 885 886 len = min_t(unsigned int, len, sizeof(opts)); 887 if (copy_to_user(optval, (char *)&opts, len)) 888 err = -EFAULT; 889 890 break; 891 892 case SCO_CONNINFO: 893 if (sk->sk_state != BT_CONNECTED && 894 !(sk->sk_state == BT_CONNECT2 && 895 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) { 896 err = -ENOTCONN; 897 break; 898 } 899 900 memset(&cinfo, 0, sizeof(cinfo)); 901 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle; 902 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3); 903 904 len = min_t(unsigned int, len, sizeof(cinfo)); 905 if (copy_to_user(optval, (char *)&cinfo, len)) 906 err = -EFAULT; 907 908 break; 909 910 default: 911 err = -ENOPROTOOPT; 912 break; 913 } 914 915 release_sock(sk); 916 return err; 917 } 918 919 static int sco_sock_getsockopt(struct socket *sock, int level, int optname, 920 char __user *optval, int __user *optlen) 921 { 922 struct sock *sk = sock->sk; 923 int len, err = 0; 924 struct bt_voice voice; 925 926 BT_DBG("sk %p", sk); 927 928 if (level == SOL_SCO) 929 return sco_sock_getsockopt_old(sock, optname, optval, optlen); 930 931 if (get_user(len, optlen)) 932 return -EFAULT; 933 934 lock_sock(sk); 935 936 switch (optname) { 937 938 case BT_DEFER_SETUP: 939 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { 940 err = -EINVAL; 941 break; 942 } 943 944 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags), 945 (u32 __user *)optval)) 946 err = -EFAULT; 947 948 break; 949 950 case BT_VOICE: 951 voice.setting = sco_pi(sk)->setting; 952 953 len = min_t(unsigned int, len, sizeof(voice)); 954 if (copy_to_user(optval, (char *)&voice, len)) 955 err = -EFAULT; 956 957 break; 958 959 default: 960 err = -ENOPROTOOPT; 961 break; 962 } 963 964 release_sock(sk); 965 return err; 966 } 967 968 static int sco_sock_shutdown(struct socket *sock, int how) 969 { 970 struct sock *sk = sock->sk; 971 int err = 0; 972 973 BT_DBG("sock %p, sk %p", sock, sk); 974 975 if (!sk) 976 return 0; 977 978 sock_hold(sk); 979 lock_sock(sk); 980 981 if (!sk->sk_shutdown) { 982 sk->sk_shutdown = SHUTDOWN_MASK; 983 sco_sock_clear_timer(sk); 984 __sco_sock_close(sk); 985 986 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime && 987 !(current->flags & PF_EXITING)) 988 err = bt_sock_wait_state(sk, BT_CLOSED, 989 sk->sk_lingertime); 990 } 991 992 release_sock(sk); 993 sock_put(sk); 994 995 return err; 996 } 997 998 static int sco_sock_release(struct socket *sock) 999 { 1000 struct sock *sk = sock->sk; 1001 int err = 0; 1002 1003 BT_DBG("sock %p, sk %p", sock, sk); 1004 1005 if (!sk) 1006 return 0; 1007 1008 sco_sock_close(sk); 1009 1010 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime && 1011 !(current->flags & PF_EXITING)) { 1012 lock_sock(sk); 1013 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime); 1014 release_sock(sk); 1015 } 1016 1017 sock_orphan(sk); 1018 sco_sock_kill(sk); 1019 return err; 1020 } 1021 1022 static void sco_conn_ready(struct sco_conn *conn) 1023 { 1024 struct sock *parent; 1025 struct sock *sk = conn->sk; 1026 1027 BT_DBG("conn %p", conn); 1028 1029 if (sk) { 1030 sco_sock_clear_timer(sk); 1031 bh_lock_sock(sk); 1032 sk->sk_state = BT_CONNECTED; 1033 sk->sk_state_change(sk); 1034 bh_unlock_sock(sk); 1035 } else { 1036 sco_conn_lock(conn); 1037 1038 if (!conn->hcon) { 1039 sco_conn_unlock(conn); 1040 return; 1041 } 1042 1043 parent = sco_get_sock_listen(&conn->hcon->src); 1044 if (!parent) { 1045 sco_conn_unlock(conn); 1046 return; 1047 } 1048 1049 bh_lock_sock(parent); 1050 1051 sk = sco_sock_alloc(sock_net(parent), NULL, 1052 BTPROTO_SCO, GFP_ATOMIC, 0); 1053 if (!sk) { 1054 bh_unlock_sock(parent); 1055 sco_conn_unlock(conn); 1056 return; 1057 } 1058 1059 sco_sock_init(sk, parent); 1060 1061 bacpy(&sco_pi(sk)->src, &conn->hcon->src); 1062 bacpy(&sco_pi(sk)->dst, &conn->hcon->dst); 1063 1064 hci_conn_hold(conn->hcon); 1065 __sco_chan_add(conn, sk, parent); 1066 1067 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) 1068 sk->sk_state = BT_CONNECT2; 1069 else 1070 sk->sk_state = BT_CONNECTED; 1071 1072 /* Wake up parent */ 1073 parent->sk_data_ready(parent); 1074 1075 bh_unlock_sock(parent); 1076 1077 sco_conn_unlock(conn); 1078 } 1079 } 1080 1081 /* ----- SCO interface with lower layer (HCI) ----- */ 1082 int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags) 1083 { 1084 struct sock *sk; 1085 int lm = 0; 1086 1087 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr); 1088 1089 /* Find listening sockets */ 1090 read_lock(&sco_sk_list.lock); 1091 sk_for_each(sk, &sco_sk_list.head) { 1092 if (sk->sk_state != BT_LISTEN) 1093 continue; 1094 1095 if (!bacmp(&sco_pi(sk)->src, &hdev->bdaddr) || 1096 !bacmp(&sco_pi(sk)->src, BDADDR_ANY)) { 1097 lm |= HCI_LM_ACCEPT; 1098 1099 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) 1100 *flags |= HCI_PROTO_DEFER; 1101 break; 1102 } 1103 } 1104 read_unlock(&sco_sk_list.lock); 1105 1106 return lm; 1107 } 1108 1109 static void sco_connect_cfm(struct hci_conn *hcon, __u8 status) 1110 { 1111 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK) 1112 return; 1113 1114 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status); 1115 1116 if (!status) { 1117 struct sco_conn *conn; 1118 1119 conn = sco_conn_add(hcon); 1120 if (conn) 1121 sco_conn_ready(conn); 1122 } else 1123 sco_conn_del(hcon, bt_to_errno(status)); 1124 } 1125 1126 static void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason) 1127 { 1128 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK) 1129 return; 1130 1131 BT_DBG("hcon %p reason %d", hcon, reason); 1132 1133 sco_conn_del(hcon, bt_to_errno(reason)); 1134 } 1135 1136 void sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb) 1137 { 1138 struct sco_conn *conn = hcon->sco_data; 1139 1140 if (!conn) 1141 goto drop; 1142 1143 BT_DBG("conn %p len %d", conn, skb->len); 1144 1145 if (skb->len) { 1146 sco_recv_frame(conn, skb); 1147 return; 1148 } 1149 1150 drop: 1151 kfree_skb(skb); 1152 } 1153 1154 static struct hci_cb sco_cb = { 1155 .name = "SCO", 1156 .connect_cfm = sco_connect_cfm, 1157 .disconn_cfm = sco_disconn_cfm, 1158 }; 1159 1160 static int sco_debugfs_show(struct seq_file *f, void *p) 1161 { 1162 struct sock *sk; 1163 1164 read_lock(&sco_sk_list.lock); 1165 1166 sk_for_each(sk, &sco_sk_list.head) { 1167 seq_printf(f, "%pMR %pMR %d\n", &sco_pi(sk)->src, 1168 &sco_pi(sk)->dst, sk->sk_state); 1169 } 1170 1171 read_unlock(&sco_sk_list.lock); 1172 1173 return 0; 1174 } 1175 1176 static int sco_debugfs_open(struct inode *inode, struct file *file) 1177 { 1178 return single_open(file, sco_debugfs_show, inode->i_private); 1179 } 1180 1181 static const struct file_operations sco_debugfs_fops = { 1182 .open = sco_debugfs_open, 1183 .read = seq_read, 1184 .llseek = seq_lseek, 1185 .release = single_release, 1186 }; 1187 1188 static struct dentry *sco_debugfs; 1189 1190 static const struct proto_ops sco_sock_ops = { 1191 .family = PF_BLUETOOTH, 1192 .owner = THIS_MODULE, 1193 .release = sco_sock_release, 1194 .bind = sco_sock_bind, 1195 .connect = sco_sock_connect, 1196 .listen = sco_sock_listen, 1197 .accept = sco_sock_accept, 1198 .getname = sco_sock_getname, 1199 .sendmsg = sco_sock_sendmsg, 1200 .recvmsg = sco_sock_recvmsg, 1201 .poll = bt_sock_poll, 1202 .ioctl = bt_sock_ioctl, 1203 .mmap = sock_no_mmap, 1204 .socketpair = sock_no_socketpair, 1205 .shutdown = sco_sock_shutdown, 1206 .setsockopt = sco_sock_setsockopt, 1207 .getsockopt = sco_sock_getsockopt 1208 }; 1209 1210 static const struct net_proto_family sco_sock_family_ops = { 1211 .family = PF_BLUETOOTH, 1212 .owner = THIS_MODULE, 1213 .create = sco_sock_create, 1214 }; 1215 1216 int __init sco_init(void) 1217 { 1218 int err; 1219 1220 BUILD_BUG_ON(sizeof(struct sockaddr_sco) > sizeof(struct sockaddr)); 1221 1222 err = proto_register(&sco_proto, 0); 1223 if (err < 0) 1224 return err; 1225 1226 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops); 1227 if (err < 0) { 1228 BT_ERR("SCO socket registration failed"); 1229 goto error; 1230 } 1231 1232 err = bt_procfs_init(&init_net, "sco", &sco_sk_list, NULL); 1233 if (err < 0) { 1234 BT_ERR("Failed to create SCO proc file"); 1235 bt_sock_unregister(BTPROTO_SCO); 1236 goto error; 1237 } 1238 1239 BT_INFO("SCO socket layer initialized"); 1240 1241 hci_register_cb(&sco_cb); 1242 1243 if (IS_ERR_OR_NULL(bt_debugfs)) 1244 return 0; 1245 1246 sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs, 1247 NULL, &sco_debugfs_fops); 1248 1249 return 0; 1250 1251 error: 1252 proto_unregister(&sco_proto); 1253 return err; 1254 } 1255 1256 void sco_exit(void) 1257 { 1258 bt_procfs_cleanup(&init_net, "sco"); 1259 1260 debugfs_remove(sco_debugfs); 1261 1262 hci_unregister_cb(&sco_cb); 1263 1264 bt_sock_unregister(BTPROTO_SCO); 1265 1266 proto_unregister(&sco_proto); 1267 } 1268 1269 module_param(disable_esco, bool, 0644); 1270 MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation"); 1271