net/bluetooth/sco.c

   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, true);
 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             sock_flag(sk, SOCK_DEAD))
 398                 return;
 399
 400         BT_DBG("sk %p state %d", sk, sk->sk_state);
 401
 402         /* Kill poor orphan */
 403         bt_sock_unlink(&sco_sk_list, sk);
 404         sock_set_flag(sk, SOCK_DEAD);
 405         sock_put(sk);
 406 }
 407
 408 static void __sco_sock_close(struct sock *sk)
 409 {
 410         BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
 411
 412         switch (sk->sk_state) {
 413         case BT_LISTEN:
 414                 sco_sock_cleanup_listen(sk);
 415                 break;
 416
 417         case BT_CONNECTED:
 418         case BT_CONFIG:
 419                 if (sco_pi(sk)->conn->hcon) {
 420                         sk->sk_state = BT_DISCONN;
 421                         sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
 422                         sco_conn_lock(sco_pi(sk)->conn);
 423                         hci_conn_drop(sco_pi(sk)->conn->hcon);
 424                         sco_pi(sk)->conn->hcon = NULL;
 425                         sco_conn_unlock(sco_pi(sk)->conn);
 426                 } else
 427                         sco_chan_del(sk, ECONNRESET);
 428                 break;
 429
 430         case BT_CONNECT2:
 431         case BT_CONNECT:
 432         case BT_DISCONN:
 433                 sco_chan_del(sk, ECONNRESET);
 434                 break;
 435
 436         default:
 437                 sock_set_flag(sk, SOCK_ZAPPED);
 438                 break;
 439         }
 440 }
 441
 442 /* Must be called on unlocked socket. */
 443 static void sco_sock_close(struct sock *sk)
 444 {
 445         sco_sock_clear_timer(sk);
 446         lock_sock(sk);
 447         __sco_sock_close(sk);
 448         release_sock(sk);
 449         sco_sock_kill(sk);
 450 }
 451
 452 static void sco_sock_init(struct sock *sk, struct sock *parent)
 453 {
 454         BT_DBG("sk %p", sk);
 455
 456         if (parent) {
 457                 sk->sk_type = parent->sk_type;
 458                 bt_sk(sk)->flags = bt_sk(parent)->flags;
 459                 security_sk_clone(parent, sk);
 460         }
 461 }
 462
 463 static struct proto sco_proto = {
 464         .name           = "SCO",
 465         .owner          = THIS_MODULE,
 466         .obj_size       = sizeof(struct sco_pinfo)
 467 };
 468
 469 static struct sock *sco_sock_alloc(struct net *net, struct socket *sock,
 470                                    int proto, gfp_t prio, int kern)
 471 {
 472         struct sock *sk;
 473
 474         sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto, kern);
 475         if (!sk)
 476                 return NULL;
 477
 478         sock_init_data(sock, sk);
 479         INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
 480
 481         sk->sk_destruct = sco_sock_destruct;
 482         sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
 483
 484         sock_reset_flag(sk, SOCK_ZAPPED);
 485
 486         sk->sk_protocol = proto;
 487         sk->sk_state    = BT_OPEN;
 488
 489         sco_pi(sk)->setting = BT_VOICE_CVSD_16BIT;
 490
 491         setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk);
 492
 493         bt_sock_link(&sco_sk_list, sk);
 494         return sk;
 495 }
 496
 497 static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
 498                            int kern)
 499 {
 500         struct sock *sk;
 501
 502         BT_DBG("sock %p", sock);
 503
 504         sock->state = SS_UNCONNECTED;
 505
 506         if (sock->type != SOCK_SEQPACKET)
 507                 return -ESOCKTNOSUPPORT;
 508
 509         sock->ops = &sco_sock_ops;
 510
 511         sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
 512         if (!sk)
 513                 return -ENOMEM;
 514
 515         sco_sock_init(sk, NULL);
 516         return 0;
 517 }
 518
 519 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr,
 520                          int addr_len)
 521 {
 522         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
 523         struct sock *sk = sock->sk;
 524         int err = 0;
 525
 526         BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
 527
 528         if (!addr || addr_len < sizeof(struct sockaddr_sco) ||
 529             addr->sa_family != AF_BLUETOOTH)
 530                 return -EINVAL;
 531
 532         lock_sock(sk);
 533
 534         if (sk->sk_state != BT_OPEN) {
 535                 err = -EBADFD;
 536                 goto done;
 537         }
 538
 539         if (sk->sk_type != SOCK_SEQPACKET) {
 540                 err = -EINVAL;
 541                 goto done;
 542         }
 543
 544         bacpy(&sco_pi(sk)->src, &sa->sco_bdaddr);
 545
 546         sk->sk_state = BT_BOUND;
 547
 548 done:
 549         release_sock(sk);
 550         return err;
 551 }
 552
 553 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
 554 {
 555         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
 556         struct sock *sk = sock->sk;
 557         int err;
 558
 559         BT_DBG("sk %p", sk);
 560
 561         if (alen < sizeof(struct sockaddr_sco) ||
 562             addr->sa_family != AF_BLUETOOTH)
 563                 return -EINVAL;
 564
 565         if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
 566                 return -EBADFD;
 567
 568         if (sk->sk_type != SOCK_SEQPACKET)
 569                 return -EINVAL;
 570
 571         lock_sock(sk);
 572
 573         /* Set destination address and psm */
 574         bacpy(&sco_pi(sk)->dst, &sa->sco_bdaddr);
 575
 576         err = sco_connect(sk);
 577         if (err)
 578                 goto done;
 579
 580         err = bt_sock_wait_state(sk, BT_CONNECTED,
 581                                  sock_sndtimeo(sk, flags & O_NONBLOCK));
 582
 583 done:
 584         release_sock(sk);
 585         return err;
 586 }
 587
 588 static int sco_sock_listen(struct socket *sock, int backlog)
 589 {
 590         struct sock *sk = sock->sk;
 591         bdaddr_t *src = &sco_pi(sk)->src;
 592         int err = 0;
 593
 594         BT_DBG("sk %p backlog %d", sk, backlog);
 595
 596         lock_sock(sk);
 597
 598         if (sk->sk_state != BT_BOUND) {
 599                 err = -EBADFD;
 600                 goto done;
 601         }
 602
 603         if (sk->sk_type != SOCK_SEQPACKET) {
 604                 err = -EINVAL;
 605                 goto done;
 606         }
 607
 608         write_lock(&sco_sk_list.lock);
 609
 610         if (__sco_get_sock_listen_by_addr(src)) {
 611                 err = -EADDRINUSE;
 612                 goto unlock;
 613         }
 614
 615         sk->sk_max_ack_backlog = backlog;
 616         sk->sk_ack_backlog = 0;
 617
 618         sk->sk_state = BT_LISTEN;
 619
 620 unlock:
 621         write_unlock(&sco_sk_list.lock);
 622
 623 done:
 624         release_sock(sk);
 625         return err;
 626 }
 627
 628 static int sco_sock_accept(struct socket *sock, struct socket *newsock,
 629                            int flags, bool kern)
 630 {
 631         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 632         struct sock *sk = sock->sk, *ch;
 633         long timeo;
 634         int err = 0;
 635
 636         lock_sock(sk);
 637
 638         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 639
 640         BT_DBG("sk %p timeo %ld", sk, timeo);
 641
 642         /* Wait for an incoming connection. (wake-one). */
 643         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 644         while (1) {
 645                 if (sk->sk_state != BT_LISTEN) {
 646                         err = -EBADFD;
 647                         break;
 648                 }
 649
 650                 ch = bt_accept_dequeue(sk, newsock);
 651                 if (ch)
 652                         break;
 653
 654                 if (!timeo) {
 655                         err = -EAGAIN;
 656                         break;
 657                 }
 658
 659                 if (signal_pending(current)) {
 660                         err = sock_intr_errno(timeo);
 661                         break;
 662                 }
 663
 664                 release_sock(sk);
 665
 666                 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
 667                 lock_sock(sk);
 668         }
 669         remove_wait_queue(sk_sleep(sk), &wait);
 670
 671         if (err)
 672                 goto done;
 673
 674         newsock->state = SS_CONNECTED;
 675
 676         BT_DBG("new socket %p", ch);
 677
 678 done:
 679         release_sock(sk);
 680         return err;
 681 }
 682
 683 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr,
 684                             int *len, int peer)
 685 {
 686         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
 687         struct sock *sk = sock->sk;
 688
 689         BT_DBG("sock %p, sk %p", sock, sk);
 690
 691         addr->sa_family = AF_BLUETOOTH;
 692         *len = sizeof(struct sockaddr_sco);
 693
 694         if (peer)
 695                 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->dst);
 696         else
 697                 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->src);
 698
 699         return 0;
 700 }
 701
 702 static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
 703                             size_t len)
 704 {
 705         struct sock *sk = sock->sk;
 706         int err;
 707
 708         BT_DBG("sock %p, sk %p", sock, sk);
 709
 710         err = sock_error(sk);
 711         if (err)
 712                 return err;
 713
 714         if (msg->msg_flags & MSG_OOB)
 715                 return -EOPNOTSUPP;
 716
 717         lock_sock(sk);
 718
 719         if (sk->sk_state == BT_CONNECTED)
 720                 err = sco_send_frame(sk, msg, len);
 721         else
 722                 err = -ENOTCONN;
 723
 724         release_sock(sk);
 725         return err;
 726 }
 727
 728 static void sco_conn_defer_accept(struct hci_conn *conn, u16 setting)
 729 {
 730         struct hci_dev *hdev = conn->hdev;
 731
 732         BT_DBG("conn %p", conn);
 733
 734         conn->state = BT_CONFIG;
 735
 736         if (!lmp_esco_capable(hdev)) {
 737                 struct hci_cp_accept_conn_req cp;
 738
 739                 bacpy(&cp.bdaddr, &conn->dst);
 740                 cp.role = 0x00; /* Ignored */
 741
 742                 hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp);
 743         } else {
 744                 struct hci_cp_accept_sync_conn_req cp;
 745
 746                 bacpy(&cp.bdaddr, &conn->dst);
 747                 cp.pkt_type = cpu_to_le16(conn->pkt_type);
 748
 749                 cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
 750                 cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
 751                 cp.content_format = cpu_to_le16(setting);
 752
 753                 switch (setting & SCO_AIRMODE_MASK) {
 754                 case SCO_AIRMODE_TRANSP:
 755                         if (conn->pkt_type & ESCO_2EV3)
 756                                 cp.max_latency = cpu_to_le16(0x0008);
 757                         else
 758                                 cp.max_latency = cpu_to_le16(0x000D);
 759                         cp.retrans_effort = 0x02;
 760                         break;
 761                 case SCO_AIRMODE_CVSD:
 762                         cp.max_latency = cpu_to_le16(0xffff);
 763                         cp.retrans_effort = 0xff;
 764                         break;
 765                 }
 766
 767                 hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ,
 768                              sizeof(cp), &cp);
 769         }
 770 }
 771
 772 static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
 773                             size_t len, int flags)
 774 {
 775         struct sock *sk = sock->sk;
 776         struct sco_pinfo *pi = sco_pi(sk);
 777
 778         lock_sock(sk);
 779
 780         if (sk->sk_state == BT_CONNECT2 &&
 781             test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
 782                 sco_conn_defer_accept(pi->conn->hcon, pi->setting);
 783                 sk->sk_state = BT_CONFIG;
 784
 785                 release_sock(sk);
 786                 return 0;
 787         }
 788
 789         release_sock(sk);
 790
 791         return bt_sock_recvmsg(sock, msg, len, flags);
 792 }
 793
 794 static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
 795                                char __user *optval, unsigned int optlen)
 796 {
 797         struct sock *sk = sock->sk;
 798         int len, err = 0;
 799         struct bt_voice voice;
 800         u32 opt;
 801
 802         BT_DBG("sk %p", sk);
 803
 804         lock_sock(sk);
 805
 806         switch (optname) {
 807
 808         case BT_DEFER_SETUP:
 809                 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
 810                         err = -EINVAL;
 811                         break;
 812                 }
 813
 814                 if (get_user(opt, (u32 __user *) optval)) {
 815                         err = -EFAULT;
 816                         break;
 817                 }
 818
 819                 if (opt)
 820                         set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
 821                 else
 822                         clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
 823                 break;
 824
 825         case BT_VOICE:
 826                 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
 827                     sk->sk_state != BT_CONNECT2) {
 828                         err = -EINVAL;
 829                         break;
 830                 }
 831
 832                 voice.setting = sco_pi(sk)->setting;
 833
 834                 len = min_t(unsigned int, sizeof(voice), optlen);
 835                 if (copy_from_user((char *)&voice, optval, len)) {
 836                         err = -EFAULT;
 837                         break;
 838                 }
 839
 840                 /* Explicitly check for these values */
 841                 if (voice.setting != BT_VOICE_TRANSPARENT &&
 842                     voice.setting != BT_VOICE_CVSD_16BIT) {
 843                         err = -EINVAL;
 844                         break;
 845                 }
 846
 847                 sco_pi(sk)->setting = voice.setting;
 848                 break;
 849
 850         default:
 851                 err = -ENOPROTOOPT;
 852                 break;
 853         }
 854
 855         release_sock(sk);
 856         return err;
 857 }
 858
 859 static int sco_sock_getsockopt_old(struct socket *sock, int optname,
 860                                    char __user *optval, int __user *optlen)
 861 {
 862         struct sock *sk = sock->sk;
 863         struct sco_options opts;
 864         struct sco_conninfo cinfo;
 865         int len, err = 0;
 866
 867         BT_DBG("sk %p", sk);
 868
 869         if (get_user(len, optlen))
 870                 return -EFAULT;
 871
 872         lock_sock(sk);
 873
 874         switch (optname) {
 875         case SCO_OPTIONS:
 876                 if (sk->sk_state != BT_CONNECTED &&
 877                     !(sk->sk_state == BT_CONNECT2 &&
 878                       test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
 879                         err = -ENOTCONN;
 880                         break;
 881                 }
 882
 883                 opts.mtu = sco_pi(sk)->conn->mtu;
 884
 885                 BT_DBG("mtu %d", opts.mtu);
 886
 887                 len = min_t(unsigned int, len, sizeof(opts));
 888                 if (copy_to_user(optval, (char *)&opts, len))
 889                         err = -EFAULT;
 890
 891                 break;
 892
 893         case SCO_CONNINFO:
 894                 if (sk->sk_state != BT_CONNECTED &&
 895                     !(sk->sk_state == BT_CONNECT2 &&
 896                       test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
 897                         err = -ENOTCONN;
 898                         break;
 899                 }
 900
 901                 memset(&cinfo, 0, sizeof(cinfo));
 902                 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
 903                 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
 904
 905                 len = min_t(unsigned int, len, sizeof(cinfo));
 906                 if (copy_to_user(optval, (char *)&cinfo, len))
 907                         err = -EFAULT;
 908
 909                 break;
 910
 911         default:
 912                 err = -ENOPROTOOPT;
 913                 break;
 914         }
 915
 916         release_sock(sk);
 917         return err;
 918 }
 919
 920 static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
 921                                char __user *optval, int __user *optlen)
 922 {
 923         struct sock *sk = sock->sk;
 924         int len, err = 0;
 925         struct bt_voice voice;
 926
 927         BT_DBG("sk %p", sk);
 928
 929         if (level == SOL_SCO)
 930                 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
 931
 932         if (get_user(len, optlen))
 933                 return -EFAULT;
 934
 935         lock_sock(sk);
 936
 937         switch (optname) {
 938
 939         case BT_DEFER_SETUP:
 940                 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
 941                         err = -EINVAL;
 942                         break;
 943                 }
 944
 945                 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
 946                              (u32 __user *)optval))
 947                         err = -EFAULT;
 948
 949                 break;
 950
 951         case BT_VOICE:
 952                 voice.setting = sco_pi(sk)->setting;
 953
 954                 len = min_t(unsigned int, len, sizeof(voice));
 955                 if (copy_to_user(optval, (char *)&voice, len))
 956                         err = -EFAULT;
 957
 958                 break;
 959
 960         default:
 961                 err = -ENOPROTOOPT;
 962                 break;
 963         }
 964
 965         release_sock(sk);
 966         return err;
 967 }
 968
 969 static int sco_sock_shutdown(struct socket *sock, int how)
 970 {
 971         struct sock *sk = sock->sk;
 972         int err = 0;
 973
 974         BT_DBG("sock %p, sk %p", sock, sk);
 975
 976         if (!sk)
 977                 return 0;
 978
 979         sock_hold(sk);
 980         lock_sock(sk);
 981
 982         if (!sk->sk_shutdown) {
 983                 sk->sk_shutdown = SHUTDOWN_MASK;
 984                 sco_sock_clear_timer(sk);
 985                 __sco_sock_close(sk);
 986
 987                 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
 988                     !(current->flags & PF_EXITING))
 989                         err = bt_sock_wait_state(sk, BT_CLOSED,
 990                                                  sk->sk_lingertime);
 991         }
 992
 993         release_sock(sk);
 994         sock_put(sk);
 995
 996         return err;
 997 }
 998
 999 static int sco_sock_release(struct socket *sock)
1000 {
1001         struct sock *sk = sock->sk;
1002         int err = 0;
1003
1004         BT_DBG("sock %p, sk %p", sock, sk);
1005
1006         if (!sk)
1007                 return 0;
1008
1009         sco_sock_close(sk);
1010
1011         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1012             !(current->flags & PF_EXITING)) {
1013                 lock_sock(sk);
1014                 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1015                 release_sock(sk);
1016         }
1017
1018         sock_orphan(sk);
1019         sco_sock_kill(sk);
1020         return err;
1021 }
1022
1023 static void sco_conn_ready(struct sco_conn *conn)
1024 {
1025         struct sock *parent;
1026         struct sock *sk = conn->sk;
1027
1028         BT_DBG("conn %p", conn);
1029
1030         if (sk) {
1031                 sco_sock_clear_timer(sk);
1032                 bh_lock_sock(sk);
1033                 sk->sk_state = BT_CONNECTED;
1034                 sk->sk_state_change(sk);
1035                 bh_unlock_sock(sk);
1036         } else {
1037                 sco_conn_lock(conn);
1038
1039                 if (!conn->hcon) {
1040                         sco_conn_unlock(conn);
1041                         return;
1042                 }
1043
1044                 parent = sco_get_sock_listen(&conn->hcon->src);
1045                 if (!parent) {
1046                         sco_conn_unlock(conn);
1047                         return;
1048                 }
1049
1050                 bh_lock_sock(parent);
1051
1052                 sk = sco_sock_alloc(sock_net(parent), NULL,
1053                                     BTPROTO_SCO, GFP_ATOMIC, 0);
1054                 if (!sk) {
1055                         bh_unlock_sock(parent);
1056                         sco_conn_unlock(conn);
1057                         return;
1058                 }
1059
1060                 sco_sock_init(sk, parent);
1061
1062                 bacpy(&sco_pi(sk)->src, &conn->hcon->src);
1063                 bacpy(&sco_pi(sk)->dst, &conn->hcon->dst);
1064
1065                 hci_conn_hold(conn->hcon);
1066                 __sco_chan_add(conn, sk, parent);
1067
1068                 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1069                         sk->sk_state = BT_CONNECT2;
1070                 else
1071                         sk->sk_state = BT_CONNECTED;
1072
1073                 /* Wake up parent */
1074                 parent->sk_data_ready(parent);
1075
1076                 bh_unlock_sock(parent);
1077
1078                 sco_conn_unlock(conn);
1079         }
1080 }
1081
1082 /* ----- SCO interface with lower layer (HCI) ----- */
1083 int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1084 {
1085         struct sock *sk;
1086         int lm = 0;
1087
1088         BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1089
1090         /* Find listening sockets */
1091         read_lock(&sco_sk_list.lock);
1092         sk_for_each(sk, &sco_sk_list.head) {
1093                 if (sk->sk_state != BT_LISTEN)
1094                         continue;
1095
1096                 if (!bacmp(&sco_pi(sk)->src, &hdev->bdaddr) ||
1097                     !bacmp(&sco_pi(sk)->src, BDADDR_ANY)) {
1098                         lm |= HCI_LM_ACCEPT;
1099
1100                         if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1101                                 *flags |= HCI_PROTO_DEFER;
1102                         break;
1103                 }
1104         }
1105         read_unlock(&sco_sk_list.lock);
1106
1107         return lm;
1108 }
1109
1110 static void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
1111 {
1112         if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1113                 return;
1114
1115         BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1116
1117         if (!status) {
1118                 struct sco_conn *conn;
1119
1120                 conn = sco_conn_add(hcon);
1121                 if (conn)
1122                         sco_conn_ready(conn);
1123         } else
1124                 sco_conn_del(hcon, bt_to_errno(status));
1125 }
1126
1127 static void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1128 {
1129         if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1130                 return;
1131
1132         BT_DBG("hcon %p reason %d", hcon, reason);
1133
1134         sco_conn_del(hcon, bt_to_errno(reason));
1135 }
1136
1137 void sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
1138 {
1139         struct sco_conn *conn = hcon->sco_data;
1140
1141         if (!conn)
1142                 goto drop;
1143
1144         BT_DBG("conn %p len %d", conn, skb->len);
1145
1146         if (skb->len) {
1147                 sco_recv_frame(conn, skb);
1148                 return;
1149         }
1150
1151 drop:
1152         kfree_skb(skb);
1153 }
1154
1155 static struct hci_cb sco_cb = {
1156         .name           = "SCO",
1157         .connect_cfm    = sco_connect_cfm,
1158         .disconn_cfm    = sco_disconn_cfm,
1159 };
1160
1161 static int sco_debugfs_show(struct seq_file *f, void *p)
1162 {
1163         struct sock *sk;
1164
1165         read_lock(&sco_sk_list.lock);
1166
1167         sk_for_each(sk, &sco_sk_list.head) {
1168                 seq_printf(f, "%pMR %pMR %d\n", &sco_pi(sk)->src,
1169                            &sco_pi(sk)->dst, sk->sk_state);
1170         }
1171
1172         read_unlock(&sco_sk_list.lock);
1173
1174         return 0;
1175 }
1176
1177 static int sco_debugfs_open(struct inode *inode, struct file *file)
1178 {
1179         return single_open(file, sco_debugfs_show, inode->i_private);
1180 }
1181
1182 static const struct file_operations sco_debugfs_fops = {
1183         .open           = sco_debugfs_open,
1184         .read           = seq_read,
1185         .llseek         = seq_lseek,
1186         .release        = single_release,
1187 };
1188
1189 static struct dentry *sco_debugfs;
1190
1191 static const struct proto_ops sco_sock_ops = {
1192         .family         = PF_BLUETOOTH,
1193         .owner          = THIS_MODULE,
1194         .release        = sco_sock_release,
1195         .bind           = sco_sock_bind,
1196         .connect        = sco_sock_connect,
1197         .listen         = sco_sock_listen,
1198         .accept         = sco_sock_accept,
1199         .getname        = sco_sock_getname,
1200         .sendmsg        = sco_sock_sendmsg,
1201         .recvmsg        = sco_sock_recvmsg,
1202         .poll           = bt_sock_poll,
1203         .ioctl          = bt_sock_ioctl,
1204         .mmap           = sock_no_mmap,
1205         .socketpair     = sock_no_socketpair,
1206         .shutdown       = sco_sock_shutdown,
1207         .setsockopt     = sco_sock_setsockopt,
1208         .getsockopt     = sco_sock_getsockopt
1209 };
1210
1211 static const struct net_proto_family sco_sock_family_ops = {
1212         .family = PF_BLUETOOTH,
1213         .owner  = THIS_MODULE,
1214         .create = sco_sock_create,
1215 };
1216
1217 int __init sco_init(void)
1218 {
1219         int err;
1220
1221         BUILD_BUG_ON(sizeof(struct sockaddr_sco) > sizeof(struct sockaddr));
1222
1223         err = proto_register(&sco_proto, 0);
1224         if (err < 0)
1225                 return err;
1226
1227         err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1228         if (err < 0) {
1229                 BT_ERR("SCO socket registration failed");
1230                 goto error;
1231         }
1232
1233         err = bt_procfs_init(&init_net, "sco", &sco_sk_list, NULL);
1234         if (err < 0) {
1235                 BT_ERR("Failed to create SCO proc file");
1236                 bt_sock_unregister(BTPROTO_SCO);
1237                 goto error;
1238         }
1239
1240         BT_INFO("SCO socket layer initialized");
1241
1242         hci_register_cb(&sco_cb);
1243
1244         if (IS_ERR_OR_NULL(bt_debugfs))
1245                 return 0;
1246
1247         sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs,
1248                                           NULL, &sco_debugfs_fops);
1249
1250         return 0;
1251
1252 error:
1253         proto_unregister(&sco_proto);
1254         return err;
1255 }
1256
1257 void sco_exit(void)
1258 {
1259         bt_procfs_cleanup(&init_net, "sco");
1260
1261         debugfs_remove(sco_debugfs);
1262
1263         hci_unregister_cb(&sco_cb);
1264
1265         bt_sock_unregister(BTPROTO_SCO);
1266
1267         proto_unregister(&sco_proto);
1268 }
1269
1270 module_param(disable_esco, bool, 0644);
1271 MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");