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
  31 #include <net/bluetooth/bluetooth.h>
  32 #include <net/bluetooth/hci_core.h>
  33 #include <net/bluetooth/sco.h>
  34
  35 static bool disable_esco;
  36
  37 static const struct proto_ops sco_sock_ops;
  38
  39 static struct bt_sock_list sco_sk_list = {
  40         .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
  41 };
  42
  43 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent);
  44 static void sco_chan_del(struct sock *sk, int err);
  45
  46 static void sco_sock_close(struct sock *sk);
  47 static void sco_sock_kill(struct sock *sk);
  48
  49 /* ---- SCO timers ---- */
  50 static void sco_sock_timeout(unsigned long arg)
  51 {
  52         struct sock *sk = (struct sock *) arg;
  53
  54         BT_DBG("sock %p state %d", sk, sk->sk_state);
  55
  56         bh_lock_sock(sk);
  57         sk->sk_err = ETIMEDOUT;
  58         sk->sk_state_change(sk);
  59         bh_unlock_sock(sk);
  60
  61         sco_sock_kill(sk);
  62         sock_put(sk);
  63 }
  64
  65 static void sco_sock_set_timer(struct sock *sk, long timeout)
  66 {
  67         BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
  68         sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
  69 }
  70
  71 static void sco_sock_clear_timer(struct sock *sk)
  72 {
  73         BT_DBG("sock %p state %d", sk, sk->sk_state);
  74         sk_stop_timer(sk, &sk->sk_timer);
  75 }
  76
  77 /* ---- SCO connections ---- */
  78 static struct sco_conn *sco_conn_add(struct hci_conn *hcon)
  79 {
  80         struct hci_dev *hdev = hcon->hdev;
  81         struct sco_conn *conn = hcon->sco_data;
  82
  83         if (conn)
  84                 return conn;
  85
  86         conn = kzalloc(sizeof(struct sco_conn), GFP_KERNEL);
  87         if (!conn)
  88                 return NULL;
  89
  90         spin_lock_init(&conn->lock);
  91
  92         hcon->sco_data = conn;
  93         conn->hcon = hcon;
  94
  95         conn->src = &hdev->bdaddr;
  96         conn->dst = &hcon->dst;
  97
  98         if (hdev->sco_mtu > 0)
  99                 conn->mtu = hdev->sco_mtu;
 100         else
 101                 conn->mtu = 60;
 102
 103         BT_DBG("hcon %p conn %p", hcon, conn);
 104
 105         return conn;
 106 }
 107
 108 static struct sock *sco_chan_get(struct sco_conn *conn)
 109 {
 110         struct sock *sk = NULL;
 111         sco_conn_lock(conn);
 112         sk = conn->sk;
 113         sco_conn_unlock(conn);
 114         return sk;
 115 }
 116
 117 static int sco_conn_del(struct hci_conn *hcon, int err)
 118 {
 119         struct sco_conn *conn = hcon->sco_data;
 120         struct sock *sk;
 121
 122         if (!conn)
 123                 return 0;
 124
 125         BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
 126
 127         /* Kill socket */
 128         sk = sco_chan_get(conn);
 129         if (sk) {
 130                 bh_lock_sock(sk);
 131                 sco_sock_clear_timer(sk);
 132                 sco_chan_del(sk, err);
 133                 bh_unlock_sock(sk);
 134                 sco_sock_kill(sk);
 135         }
 136
 137         hcon->sco_data = NULL;
 138         kfree(conn);
 139         return 0;
 140 }
 141
 142 static int sco_chan_add(struct sco_conn *conn, struct sock *sk,
 143                         struct sock *parent)
 144 {
 145         int err = 0;
 146
 147         sco_conn_lock(conn);
 148         if (conn->sk)
 149                 err = -EBUSY;
 150         else
 151                 __sco_chan_add(conn, sk, parent);
 152
 153         sco_conn_unlock(conn);
 154         return err;
 155 }
 156
 157 static int sco_connect(struct sock *sk)
 158 {
 159         bdaddr_t *src = &bt_sk(sk)->src;
 160         bdaddr_t *dst = &bt_sk(sk)->dst;
 161         struct sco_conn *conn;
 162         struct hci_conn *hcon;
 163         struct hci_dev  *hdev;
 164         int err, type;
 165
 166         BT_DBG("%pMR -> %pMR", src, dst);
 167
 168         hdev = hci_get_route(dst, src);
 169         if (!hdev)
 170                 return -EHOSTUNREACH;
 171
 172         hci_dev_lock(hdev);
 173
 174         if (lmp_esco_capable(hdev) && !disable_esco)
 175                 type = ESCO_LINK;
 176         else
 177                 type = SCO_LINK;
 178
 179         hcon = hci_connect(hdev, type, dst, BDADDR_BREDR, BT_SECURITY_LOW,
 180                            HCI_AT_NO_BONDING);
 181         if (IS_ERR(hcon)) {
 182                 err = PTR_ERR(hcon);
 183                 goto done;
 184         }
 185
 186         conn = sco_conn_add(hcon);
 187         if (!conn) {
 188                 hci_conn_drop(hcon);
 189                 err = -ENOMEM;
 190                 goto done;
 191         }
 192
 193         /* Update source addr of the socket */
 194         bacpy(src, conn->src);
 195
 196         err = sco_chan_add(conn, sk, NULL);
 197         if (err)
 198                 goto done;
 199
 200         if (hcon->state == BT_CONNECTED) {
 201                 sco_sock_clear_timer(sk);
 202                 sk->sk_state = BT_CONNECTED;
 203         } else {
 204                 sk->sk_state = BT_CONNECT;
 205                 sco_sock_set_timer(sk, sk->sk_sndtimeo);
 206         }
 207
 208 done:
 209         hci_dev_unlock(hdev);
 210         hci_dev_put(hdev);
 211         return err;
 212 }
 213
 214 static int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
 215 {
 216         struct sco_conn *conn = sco_pi(sk)->conn;
 217         struct sk_buff *skb;
 218         int err;
 219
 220         /* Check outgoing MTU */
 221         if (len > conn->mtu)
 222                 return -EINVAL;
 223
 224         BT_DBG("sk %p len %d", sk, len);
 225
 226         skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
 227         if (!skb)
 228                 return err;
 229
 230         if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
 231                 kfree_skb(skb);
 232                 return -EFAULT;
 233         }
 234
 235         hci_send_sco(conn->hcon, skb);
 236
 237         return len;
 238 }
 239
 240 static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
 241 {
 242         struct sock *sk = sco_chan_get(conn);
 243
 244         if (!sk)
 245                 goto drop;
 246
 247         BT_DBG("sk %p len %d", sk, skb->len);
 248
 249         if (sk->sk_state != BT_CONNECTED)
 250                 goto drop;
 251
 252         if (!sock_queue_rcv_skb(sk, skb))
 253                 return;
 254
 255 drop:
 256         kfree_skb(skb);
 257 }
 258
 259 /* -------- Socket interface ---------- */
 260 static struct sock *__sco_get_sock_listen_by_addr(bdaddr_t *ba)
 261 {
 262         struct sock *sk;
 263
 264         sk_for_each(sk, &sco_sk_list.head) {
 265                 if (sk->sk_state != BT_LISTEN)
 266                         continue;
 267
 268                 if (!bacmp(&bt_sk(sk)->src, ba))
 269                         return sk;
 270         }
 271
 272         return NULL;
 273 }
 274
 275 /* Find socket listening on source bdaddr.
 276  * Returns closest match.
 277  */
 278 static struct sock *sco_get_sock_listen(bdaddr_t *src)
 279 {
 280         struct sock *sk = NULL, *sk1 = NULL;
 281
 282         read_lock(&sco_sk_list.lock);
 283
 284         sk_for_each(sk, &sco_sk_list.head) {
 285                 if (sk->sk_state != BT_LISTEN)
 286                         continue;
 287
 288                 /* Exact match. */
 289                 if (!bacmp(&bt_sk(sk)->src, src))
 290                         break;
 291
 292                 /* Closest match */
 293                 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
 294                         sk1 = sk;
 295         }
 296
 297         read_unlock(&sco_sk_list.lock);
 298
 299         return sk ? sk : sk1;
 300 }
 301
 302 static void sco_sock_destruct(struct sock *sk)
 303 {
 304         BT_DBG("sk %p", sk);
 305
 306         skb_queue_purge(&sk->sk_receive_queue);
 307         skb_queue_purge(&sk->sk_write_queue);
 308 }
 309
 310 static void sco_sock_cleanup_listen(struct sock *parent)
 311 {
 312         struct sock *sk;
 313
 314         BT_DBG("parent %p", parent);
 315
 316         /* Close not yet accepted channels */
 317         while ((sk = bt_accept_dequeue(parent, NULL))) {
 318                 sco_sock_close(sk);
 319                 sco_sock_kill(sk);
 320         }
 321
 322         parent->sk_state  = BT_CLOSED;
 323         sock_set_flag(parent, SOCK_ZAPPED);
 324 }
 325
 326 /* Kill socket (only if zapped and orphan)
 327  * Must be called on unlocked socket.
 328  */
 329 static void sco_sock_kill(struct sock *sk)
 330 {
 331         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 332                 return;
 333
 334         BT_DBG("sk %p state %d", sk, sk->sk_state);
 335
 336         /* Kill poor orphan */
 337         bt_sock_unlink(&sco_sk_list, sk);
 338         sock_set_flag(sk, SOCK_DEAD);
 339         sock_put(sk);
 340 }
 341
 342 static void __sco_sock_close(struct sock *sk)
 343 {
 344         BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
 345
 346         switch (sk->sk_state) {
 347         case BT_LISTEN:
 348                 sco_sock_cleanup_listen(sk);
 349                 break;
 350
 351         case BT_CONNECTED:
 352         case BT_CONFIG:
 353                 if (sco_pi(sk)->conn->hcon) {
 354                         sk->sk_state = BT_DISCONN;
 355                         sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
 356                         hci_conn_drop(sco_pi(sk)->conn->hcon);
 357                         sco_pi(sk)->conn->hcon = NULL;
 358                 } else
 359                         sco_chan_del(sk, ECONNRESET);
 360                 break;
 361
 362         case BT_CONNECT2:
 363         case BT_CONNECT:
 364         case BT_DISCONN:
 365                 sco_chan_del(sk, ECONNRESET);
 366                 break;
 367
 368         default:
 369                 sock_set_flag(sk, SOCK_ZAPPED);
 370                 break;
 371         }
 372 }
 373
 374 /* Must be called on unlocked socket. */
 375 static void sco_sock_close(struct sock *sk)
 376 {
 377         sco_sock_clear_timer(sk);
 378         lock_sock(sk);
 379         __sco_sock_close(sk);
 380         release_sock(sk);
 381         sco_sock_kill(sk);
 382 }
 383
 384 static void sco_sock_init(struct sock *sk, struct sock *parent)
 385 {
 386         BT_DBG("sk %p", sk);
 387
 388         if (parent) {
 389                 sk->sk_type = parent->sk_type;
 390                 bt_sk(sk)->flags = bt_sk(parent)->flags;
 391                 security_sk_clone(parent, sk);
 392         }
 393 }
 394
 395 static struct proto sco_proto = {
 396         .name           = "SCO",
 397         .owner          = THIS_MODULE,
 398         .obj_size       = sizeof(struct sco_pinfo)
 399 };
 400
 401 static struct sock *sco_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
 402 {
 403         struct sock *sk;
 404
 405         sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto);
 406         if (!sk)
 407                 return NULL;
 408
 409         sock_init_data(sock, sk);
 410         INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
 411
 412         sk->sk_destruct = sco_sock_destruct;
 413         sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
 414
 415         sock_reset_flag(sk, SOCK_ZAPPED);
 416
 417         sk->sk_protocol = proto;
 418         sk->sk_state    = BT_OPEN;
 419
 420         setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk);
 421
 422         bt_sock_link(&sco_sk_list, sk);
 423         return sk;
 424 }
 425
 426 static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
 427                            int kern)
 428 {
 429         struct sock *sk;
 430
 431         BT_DBG("sock %p", sock);
 432
 433         sock->state = SS_UNCONNECTED;
 434
 435         if (sock->type != SOCK_SEQPACKET)
 436                 return -ESOCKTNOSUPPORT;
 437
 438         sock->ops = &sco_sock_ops;
 439
 440         sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC);
 441         if (!sk)
 442                 return -ENOMEM;
 443
 444         sco_sock_init(sk, NULL);
 445         return 0;
 446 }
 447
 448 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 449 {
 450         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
 451         struct sock *sk = sock->sk;
 452         int err = 0;
 453
 454         BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
 455
 456         if (!addr || addr->sa_family != AF_BLUETOOTH)
 457                 return -EINVAL;
 458
 459         lock_sock(sk);
 460
 461         if (sk->sk_state != BT_OPEN) {
 462                 err = -EBADFD;
 463                 goto done;
 464         }
 465
 466         if (sk->sk_type != SOCK_SEQPACKET) {
 467                 err = -EINVAL;
 468                 goto done;
 469         }
 470
 471         bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
 472
 473         sk->sk_state = BT_BOUND;
 474
 475 done:
 476         release_sock(sk);
 477         return err;
 478 }
 479
 480 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
 481 {
 482         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
 483         struct sock *sk = sock->sk;
 484         int err;
 485
 486         BT_DBG("sk %p", sk);
 487
 488         if (alen < sizeof(struct sockaddr_sco) ||
 489             addr->sa_family != AF_BLUETOOTH)
 490                 return -EINVAL;
 491
 492         if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
 493                 return -EBADFD;
 494
 495         if (sk->sk_type != SOCK_SEQPACKET)
 496                 return -EINVAL;
 497
 498         lock_sock(sk);
 499
 500         /* Set destination address and psm */
 501         bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
 502
 503         err = sco_connect(sk);
 504         if (err)
 505                 goto done;
 506
 507         err = bt_sock_wait_state(sk, BT_CONNECTED,
 508                                  sock_sndtimeo(sk, flags & O_NONBLOCK));
 509
 510 done:
 511         release_sock(sk);
 512         return err;
 513 }
 514
 515 static int sco_sock_listen(struct socket *sock, int backlog)
 516 {
 517         struct sock *sk = sock->sk;
 518         bdaddr_t *src = &bt_sk(sk)->src;
 519         int err = 0;
 520
 521         BT_DBG("sk %p backlog %d", sk, backlog);
 522
 523         lock_sock(sk);
 524
 525         if (sk->sk_state != BT_BOUND) {
 526                 err = -EBADFD;
 527                 goto done;
 528         }
 529
 530         if (sk->sk_type != SOCK_SEQPACKET) {
 531                 err = -EINVAL;
 532                 goto done;
 533         }
 534
 535         write_lock(&sco_sk_list.lock);
 536
 537         if (__sco_get_sock_listen_by_addr(src)) {
 538                 err = -EADDRINUSE;
 539                 goto unlock;
 540         }
 541
 542         sk->sk_max_ack_backlog = backlog;
 543         sk->sk_ack_backlog = 0;
 544
 545         sk->sk_state = BT_LISTEN;
 546
 547 unlock:
 548         write_unlock(&sco_sk_list.lock);
 549
 550 done:
 551         release_sock(sk);
 552         return err;
 553 }
 554
 555 static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
 556 {
 557         DECLARE_WAITQUEUE(wait, current);
 558         struct sock *sk = sock->sk, *ch;
 559         long timeo;
 560         int err = 0;
 561
 562         lock_sock(sk);
 563
 564         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 565
 566         BT_DBG("sk %p timeo %ld", sk, timeo);
 567
 568         /* Wait for an incoming connection. (wake-one). */
 569         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 570         while (1) {
 571                 set_current_state(TASK_INTERRUPTIBLE);
 572
 573                 if (sk->sk_state != BT_LISTEN) {
 574                         err = -EBADFD;
 575                         break;
 576                 }
 577
 578                 ch = bt_accept_dequeue(sk, newsock);
 579                 if (ch)
 580                         break;
 581
 582                 if (!timeo) {
 583                         err = -EAGAIN;
 584                         break;
 585                 }
 586
 587                 if (signal_pending(current)) {
 588                         err = sock_intr_errno(timeo);
 589                         break;
 590                 }
 591
 592                 release_sock(sk);
 593                 timeo = schedule_timeout(timeo);
 594                 lock_sock(sk);
 595         }
 596         __set_current_state(TASK_RUNNING);
 597         remove_wait_queue(sk_sleep(sk), &wait);
 598
 599         if (err)
 600                 goto done;
 601
 602         newsock->state = SS_CONNECTED;
 603
 604         BT_DBG("new socket %p", ch);
 605
 606 done:
 607         release_sock(sk);
 608         return err;
 609 }
 610
 611 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
 612 {
 613         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
 614         struct sock *sk = sock->sk;
 615
 616         BT_DBG("sock %p, sk %p", sock, sk);
 617
 618         addr->sa_family = AF_BLUETOOTH;
 619         *len = sizeof(struct sockaddr_sco);
 620
 621         if (peer)
 622                 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
 623         else
 624                 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);
 625
 626         return 0;
 627 }
 628
 629 static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 630                             struct msghdr *msg, size_t len)
 631 {
 632         struct sock *sk = sock->sk;
 633         int err;
 634
 635         BT_DBG("sock %p, sk %p", sock, sk);
 636
 637         err = sock_error(sk);
 638         if (err)
 639                 return err;
 640
 641         if (msg->msg_flags & MSG_OOB)
 642                 return -EOPNOTSUPP;
 643
 644         lock_sock(sk);
 645
 646         if (sk->sk_state == BT_CONNECTED)
 647                 err = sco_send_frame(sk, msg, len);
 648         else
 649                 err = -ENOTCONN;
 650
 651         release_sock(sk);
 652         return err;
 653 }
 654
 655 static void sco_conn_defer_accept(struct hci_conn *conn, int mask)
 656 {
 657         struct hci_dev *hdev = conn->hdev;
 658
 659         BT_DBG("conn %p", conn);
 660
 661         conn->state = BT_CONFIG;
 662
 663         if (!lmp_esco_capable(hdev)) {
 664                 struct hci_cp_accept_conn_req cp;
 665
 666                 bacpy(&cp.bdaddr, &conn->dst);
 667
 668                 if (lmp_rswitch_capable(hdev) && (mask & HCI_LM_MASTER))
 669                         cp.role = 0x00; /* Become master */
 670                 else
 671                         cp.role = 0x01; /* Remain slave */
 672
 673                 hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp);
 674         } else {
 675                 struct hci_cp_accept_sync_conn_req cp;
 676
 677                 bacpy(&cp.bdaddr, &conn->dst);
 678                 cp.pkt_type = cpu_to_le16(conn->pkt_type);
 679
 680                 cp.tx_bandwidth   = __constant_cpu_to_le32(0x00001f40);
 681                 cp.rx_bandwidth   = __constant_cpu_to_le32(0x00001f40);
 682                 cp.max_latency    = __constant_cpu_to_le16(0xffff);
 683                 cp.content_format = cpu_to_le16(hdev->voice_setting);
 684                 cp.retrans_effort = 0xff;
 685
 686                 hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ,
 687                              sizeof(cp), &cp);
 688         }
 689 }
 690
 691 static int sco_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 692                             struct msghdr *msg, size_t len, int flags)
 693 {
 694         struct sock *sk = sock->sk;
 695         struct sco_pinfo *pi = sco_pi(sk);
 696
 697         lock_sock(sk);
 698
 699         if (sk->sk_state == BT_CONNECT2 &&
 700             test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
 701                 sco_conn_defer_accept(pi->conn->hcon, 0);
 702                 sk->sk_state = BT_CONFIG;
 703                 msg->msg_namelen = 0;
 704
 705                 release_sock(sk);
 706                 return 0;
 707         }
 708
 709         release_sock(sk);
 710
 711         return bt_sock_recvmsg(iocb, sock, msg, len, flags);
 712 }
 713
 714 static int sco_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
 715 {
 716         struct sock *sk = sock->sk;
 717         int err = 0;
 718         u32 opt;
 719
 720         BT_DBG("sk %p", sk);
 721
 722         lock_sock(sk);
 723
 724         switch (optname) {
 725
 726         case BT_DEFER_SETUP:
 727                 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
 728                         err = -EINVAL;
 729                         break;
 730                 }
 731
 732                 if (get_user(opt, (u32 __user *) optval)) {
 733                         err = -EFAULT;
 734                         break;
 735                 }
 736
 737                 if (opt)
 738                         set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
 739                 else
 740                         clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
 741                 break;
 742
 743         default:
 744                 err = -ENOPROTOOPT;
 745                 break;
 746         }
 747
 748         release_sock(sk);
 749         return err;
 750 }
 751
 752 static int sco_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
 753 {
 754         struct sock *sk = sock->sk;
 755         struct sco_options opts;
 756         struct sco_conninfo cinfo;
 757         int len, err = 0;
 758
 759         BT_DBG("sk %p", sk);
 760
 761         if (get_user(len, optlen))
 762                 return -EFAULT;
 763
 764         lock_sock(sk);
 765
 766         switch (optname) {
 767         case SCO_OPTIONS:
 768                 if (sk->sk_state != BT_CONNECTED) {
 769                         err = -ENOTCONN;
 770                         break;
 771                 }
 772
 773                 opts.mtu = sco_pi(sk)->conn->mtu;
 774
 775                 BT_DBG("mtu %d", opts.mtu);
 776
 777                 len = min_t(unsigned int, len, sizeof(opts));
 778                 if (copy_to_user(optval, (char *)&opts, len))
 779                         err = -EFAULT;
 780
 781                 break;
 782
 783         case SCO_CONNINFO:
 784                 if (sk->sk_state != BT_CONNECTED) {
 785                         err = -ENOTCONN;
 786                         break;
 787                 }
 788
 789                 memset(&cinfo, 0, sizeof(cinfo));
 790                 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
 791                 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
 792
 793                 len = min_t(unsigned int, len, sizeof(cinfo));
 794                 if (copy_to_user(optval, (char *)&cinfo, len))
 795                         err = -EFAULT;
 796
 797                 break;
 798
 799         default:
 800                 err = -ENOPROTOOPT;
 801                 break;
 802         }
 803
 804         release_sock(sk);
 805         return err;
 806 }
 807
 808 static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
 809 {
 810         struct sock *sk = sock->sk;
 811         int len, err = 0;
 812
 813         BT_DBG("sk %p", sk);
 814
 815         if (level == SOL_SCO)
 816                 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
 817
 818         if (get_user(len, optlen))
 819                 return -EFAULT;
 820
 821         lock_sock(sk);
 822
 823         switch (optname) {
 824
 825         case BT_DEFER_SETUP:
 826                 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
 827                         err = -EINVAL;
 828                         break;
 829                 }
 830
 831                 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
 832                              (u32 __user *) optval))
 833                         err = -EFAULT;
 834
 835                 break;
 836
 837         default:
 838                 err = -ENOPROTOOPT;
 839                 break;
 840         }
 841
 842         release_sock(sk);
 843         return err;
 844 }
 845
 846 static int sco_sock_shutdown(struct socket *sock, int how)
 847 {
 848         struct sock *sk = sock->sk;
 849         int err = 0;
 850
 851         BT_DBG("sock %p, sk %p", sock, sk);
 852
 853         if (!sk)
 854                 return 0;
 855
 856         lock_sock(sk);
 857         if (!sk->sk_shutdown) {
 858                 sk->sk_shutdown = SHUTDOWN_MASK;
 859                 sco_sock_clear_timer(sk);
 860                 __sco_sock_close(sk);
 861
 862                 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 863                         err = bt_sock_wait_state(sk, BT_CLOSED,
 864                                                  sk->sk_lingertime);
 865         }
 866         release_sock(sk);
 867         return err;
 868 }
 869
 870 static int sco_sock_release(struct socket *sock)
 871 {
 872         struct sock *sk = sock->sk;
 873         int err = 0;
 874
 875         BT_DBG("sock %p, sk %p", sock, sk);
 876
 877         if (!sk)
 878                 return 0;
 879
 880         sco_sock_close(sk);
 881
 882         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
 883                 lock_sock(sk);
 884                 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
 885                 release_sock(sk);
 886         }
 887
 888         sock_orphan(sk);
 889         sco_sock_kill(sk);
 890         return err;
 891 }
 892
 893 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
 894 {
 895         BT_DBG("conn %p", conn);
 896
 897         sco_pi(sk)->conn = conn;
 898         conn->sk = sk;
 899
 900         if (parent)
 901                 bt_accept_enqueue(parent, sk);
 902 }
 903
 904 /* Delete channel.
 905  * Must be called on the locked socket. */
 906 static void sco_chan_del(struct sock *sk, int err)
 907 {
 908         struct sco_conn *conn;
 909
 910         conn = sco_pi(sk)->conn;
 911
 912         BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
 913
 914         if (conn) {
 915                 sco_conn_lock(conn);
 916                 conn->sk = NULL;
 917                 sco_pi(sk)->conn = NULL;
 918                 sco_conn_unlock(conn);
 919
 920                 if (conn->hcon)
 921                         hci_conn_drop(conn->hcon);
 922         }
 923
 924         sk->sk_state = BT_CLOSED;
 925         sk->sk_err   = err;
 926         sk->sk_state_change(sk);
 927
 928         sock_set_flag(sk, SOCK_ZAPPED);
 929 }
 930
 931 static void sco_conn_ready(struct sco_conn *conn)
 932 {
 933         struct sock *parent;
 934         struct sock *sk = conn->sk;
 935
 936         BT_DBG("conn %p", conn);
 937
 938         if (sk) {
 939                 sco_sock_clear_timer(sk);
 940                 bh_lock_sock(sk);
 941                 sk->sk_state = BT_CONNECTED;
 942                 sk->sk_state_change(sk);
 943                 bh_unlock_sock(sk);
 944         } else {
 945                 sco_conn_lock(conn);
 946
 947                 parent = sco_get_sock_listen(conn->src);
 948                 if (!parent) {
 949                         sco_conn_unlock(conn);
 950                         return;
 951                 }
 952
 953                 bh_lock_sock(parent);
 954
 955                 sk = sco_sock_alloc(sock_net(parent), NULL,
 956                                     BTPROTO_SCO, GFP_ATOMIC);
 957                 if (!sk) {
 958                         bh_unlock_sock(parent);
 959                         sco_conn_unlock(conn);
 960                         return;
 961                 }
 962
 963                 sco_sock_init(sk, parent);
 964
 965                 bacpy(&bt_sk(sk)->src, conn->src);
 966                 bacpy(&bt_sk(sk)->dst, conn->dst);
 967
 968                 hci_conn_hold(conn->hcon);
 969                 __sco_chan_add(conn, sk, parent);
 970
 971                 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
 972                         sk->sk_state = BT_CONNECT2;
 973                 else
 974                         sk->sk_state = BT_CONNECTED;
 975
 976                 /* Wake up parent */
 977                 parent->sk_data_ready(parent, 1);
 978
 979                 bh_unlock_sock(parent);
 980
 981                 sco_conn_unlock(conn);
 982         }
 983 }
 984
 985 /* ----- SCO interface with lower layer (HCI) ----- */
 986 int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
 987 {
 988         struct sock *sk;
 989         int lm = 0;
 990
 991         BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
 992
 993         /* Find listening sockets */
 994         read_lock(&sco_sk_list.lock);
 995         sk_for_each(sk, &sco_sk_list.head) {
 996                 if (sk->sk_state != BT_LISTEN)
 997                         continue;
 998
 999                 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr) ||
1000                     !bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
1001                         lm |= HCI_LM_ACCEPT;
1002
1003                         if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1004                                 *flags |= HCI_PROTO_DEFER;
1005                         break;
1006                 }
1007         }
1008         read_unlock(&sco_sk_list.lock);
1009
1010         return lm;
1011 }
1012
1013 void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
1014 {
1015         BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1016         if (!status) {
1017                 struct sco_conn *conn;
1018
1019                 conn = sco_conn_add(hcon);
1020                 if (conn)
1021                         sco_conn_ready(conn);
1022         } else
1023                 sco_conn_del(hcon, bt_to_errno(status));
1024 }
1025
1026 void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1027 {
1028         BT_DBG("hcon %p reason %d", hcon, reason);
1029
1030         sco_conn_del(hcon, bt_to_errno(reason));
1031 }
1032
1033 int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
1034 {
1035         struct sco_conn *conn = hcon->sco_data;
1036
1037         if (!conn)
1038                 goto drop;
1039
1040         BT_DBG("conn %p len %d", conn, skb->len);
1041
1042         if (skb->len) {
1043                 sco_recv_frame(conn, skb);
1044                 return 0;
1045         }
1046
1047 drop:
1048         kfree_skb(skb);
1049         return 0;
1050 }
1051
1052 static int sco_debugfs_show(struct seq_file *f, void *p)
1053 {
1054         struct sock *sk;
1055
1056         read_lock(&sco_sk_list.lock);
1057
1058         sk_for_each(sk, &sco_sk_list.head) {
1059                 seq_printf(f, "%pMR %pMR %d\n", &bt_sk(sk)->src,
1060                            &bt_sk(sk)->dst, sk->sk_state);
1061         }
1062
1063         read_unlock(&sco_sk_list.lock);
1064
1065         return 0;
1066 }
1067
1068 static int sco_debugfs_open(struct inode *inode, struct file *file)
1069 {
1070         return single_open(file, sco_debugfs_show, inode->i_private);
1071 }
1072
1073 static const struct file_operations sco_debugfs_fops = {
1074         .open           = sco_debugfs_open,
1075         .read           = seq_read,
1076         .llseek         = seq_lseek,
1077         .release        = single_release,
1078 };
1079
1080 static struct dentry *sco_debugfs;
1081
1082 static const struct proto_ops sco_sock_ops = {
1083         .family         = PF_BLUETOOTH,
1084         .owner          = THIS_MODULE,
1085         .release        = sco_sock_release,
1086         .bind           = sco_sock_bind,
1087         .connect        = sco_sock_connect,
1088         .listen         = sco_sock_listen,
1089         .accept         = sco_sock_accept,
1090         .getname        = sco_sock_getname,
1091         .sendmsg        = sco_sock_sendmsg,
1092         .recvmsg        = sco_sock_recvmsg,
1093         .poll           = bt_sock_poll,
1094         .ioctl          = bt_sock_ioctl,
1095         .mmap           = sock_no_mmap,
1096         .socketpair     = sock_no_socketpair,
1097         .shutdown       = sco_sock_shutdown,
1098         .setsockopt     = sco_sock_setsockopt,
1099         .getsockopt     = sco_sock_getsockopt
1100 };
1101
1102 static const struct net_proto_family sco_sock_family_ops = {
1103         .family = PF_BLUETOOTH,
1104         .owner  = THIS_MODULE,
1105         .create = sco_sock_create,
1106 };
1107
1108 int __init sco_init(void)
1109 {
1110         int err;
1111
1112         err = proto_register(&sco_proto, 0);
1113         if (err < 0)
1114                 return err;
1115
1116         err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1117         if (err < 0) {
1118                 BT_ERR("SCO socket registration failed");
1119                 goto error;
1120         }
1121
1122         err = bt_procfs_init(&init_net, "sco", &sco_sk_list, NULL);
1123         if (err < 0) {
1124                 BT_ERR("Failed to create SCO proc file");
1125                 bt_sock_unregister(BTPROTO_SCO);
1126                 goto error;
1127         }
1128
1129         if (bt_debugfs) {
1130                 sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs,
1131                                                   NULL, &sco_debugfs_fops);
1132                 if (!sco_debugfs)
1133                         BT_ERR("Failed to create SCO debug file");
1134         }
1135
1136         BT_INFO("SCO socket layer initialized");
1137
1138         return 0;
1139
1140 error:
1141         proto_unregister(&sco_proto);
1142         return err;
1143 }
1144
1145 void __exit sco_exit(void)
1146 {
1147         bt_procfs_cleanup(&init_net, "sco");
1148
1149         debugfs_remove(sco_debugfs);
1150
1151         bt_sock_unregister(BTPROTO_SCO);
1152
1153         proto_unregister(&sco_proto);
1154 }
1155
1156 module_param(disable_esco, bool, 0644);
1157 MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");