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
  29 #include <linux/types.h>
  30 #include <linux/errno.h>
  31 #include <linux/kernel.h>
  32 #include <linux/sched.h>
  33 #include <linux/slab.h>
  34 #include <linux/poll.h>
  35 #include <linux/fcntl.h>
  36 #include <linux/init.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/socket.h>
  39 #include <linux/skbuff.h>
  40 #include <linux/device.h>
  41 #include <linux/list.h>
  42 #include <net/sock.h>
  43
  44 #include <asm/system.h>
  45 #include <asm/uaccess.h>
  46
  47 #include <net/bluetooth/bluetooth.h>
  48 #include <net/bluetooth/hci_core.h>
  49 #include <net/bluetooth/sco.h>
  50
  51 #define VERSION "0.6"
  52
  53 static int disable_esco = 0;
  54
  55 static const struct proto_ops sco_sock_ops;
  56
  57 static struct bt_sock_list sco_sk_list = {
  58         .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
  59 };
  60
  61 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent);
  62 static void sco_chan_del(struct sock *sk, int err);
  63
  64 static int  sco_conn_del(struct hci_conn *conn, int err);
  65
  66 static void sco_sock_close(struct sock *sk);
  67 static void sco_sock_kill(struct sock *sk);
  68
  69 /* ---- SCO timers ---- */
  70 static void sco_sock_timeout(unsigned long arg)
  71 {
  72         struct sock *sk = (struct sock *) arg;
  73
  74         BT_DBG("sock %p state %d", sk, sk->sk_state);
  75
  76         bh_lock_sock(sk);
  77         sk->sk_err = ETIMEDOUT;
  78         sk->sk_state_change(sk);
  79         bh_unlock_sock(sk);
  80
  81         sco_sock_kill(sk);
  82         sock_put(sk);
  83 }
  84
  85 static void sco_sock_set_timer(struct sock *sk, long timeout)
  86 {
  87         BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
  88         sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
  89 }
  90
  91 static void sco_sock_clear_timer(struct sock *sk)
  92 {
  93         BT_DBG("sock %p state %d", sk, sk->sk_state);
  94         sk_stop_timer(sk, &sk->sk_timer);
  95 }
  96
  97 /* ---- SCO connections ---- */
  98 static struct sco_conn *sco_conn_add(struct hci_conn *hcon, __u8 status)
  99 {
 100         struct hci_dev *hdev = hcon->hdev;
 101         struct sco_conn *conn = hcon->sco_data;
 102
 103         if (conn || status)
 104                 return conn;
 105
 106         conn = kzalloc(sizeof(struct sco_conn), GFP_ATOMIC);
 107         if (!conn)
 108                 return NULL;
 109
 110         spin_lock_init(&conn->lock);
 111
 112         hcon->sco_data = conn;
 113         conn->hcon = hcon;
 114
 115         conn->src = &hdev->bdaddr;
 116         conn->dst = &hcon->dst;
 117
 118         if (hdev->sco_mtu > 0)
 119                 conn->mtu = hdev->sco_mtu;
 120         else
 121                 conn->mtu = 60;
 122
 123         BT_DBG("hcon %p conn %p", hcon, conn);
 124
 125         return conn;
 126 }
 127
 128 static inline struct sock *sco_chan_get(struct sco_conn *conn)
 129 {
 130         struct sock *sk = NULL;
 131         sco_conn_lock(conn);
 132         sk = conn->sk;
 133         sco_conn_unlock(conn);
 134         return sk;
 135 }
 136
 137 static int sco_conn_del(struct hci_conn *hcon, int err)
 138 {
 139         struct sco_conn *conn;
 140         struct sock *sk;
 141
 142         if (!(conn = hcon->sco_data))
 143                 return 0;
 144
 145         BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
 146
 147         /* Kill socket */
 148         if ((sk = sco_chan_get(conn))) {
 149                 bh_lock_sock(sk);
 150                 sco_sock_clear_timer(sk);
 151                 sco_chan_del(sk, err);
 152                 bh_unlock_sock(sk);
 153                 sco_sock_kill(sk);
 154         }
 155
 156         hcon->sco_data = NULL;
 157         kfree(conn);
 158         return 0;
 159 }
 160
 161 static inline int sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
 162 {
 163         int err = 0;
 164
 165         sco_conn_lock(conn);
 166         if (conn->sk) {
 167                 err = -EBUSY;
 168         } else {
 169                 __sco_chan_add(conn, sk, parent);
 170         }
 171         sco_conn_unlock(conn);
 172         return err;
 173 }
 174
 175 static int sco_connect(struct sock *sk)
 176 {
 177         bdaddr_t *src = &bt_sk(sk)->src;
 178         bdaddr_t *dst = &bt_sk(sk)->dst;
 179         struct sco_conn *conn;
 180         struct hci_conn *hcon;
 181         struct hci_dev  *hdev;
 182         int err, type;
 183
 184         BT_DBG("%s -> %s", batostr(src), batostr(dst));
 185
 186         if (!(hdev = hci_get_route(dst, src)))
 187                 return -EHOSTUNREACH;
 188
 189         hci_dev_lock_bh(hdev);
 190
 191         err = -ENOMEM;
 192
 193         if (lmp_esco_capable(hdev) && !disable_esco)
 194                 type = ESCO_LINK;
 195         else
 196                 type = SCO_LINK;
 197
 198         hcon = hci_connect(hdev, type, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
 199         if (!hcon)
 200                 goto done;
 201
 202         conn = sco_conn_add(hcon, 0);
 203         if (!conn) {
 204                 hci_conn_put(hcon);
 205                 goto done;
 206         }
 207
 208         /* Update source addr of the socket */
 209         bacpy(src, conn->src);
 210
 211         err = sco_chan_add(conn, sk, NULL);
 212         if (err)
 213                 goto done;
 214
 215         if (hcon->state == BT_CONNECTED) {
 216                 sco_sock_clear_timer(sk);
 217                 sk->sk_state = BT_CONNECTED;
 218         } else {
 219                 sk->sk_state = BT_CONNECT;
 220                 sco_sock_set_timer(sk, sk->sk_sndtimeo);
 221         }
 222
 223 done:
 224         hci_dev_unlock_bh(hdev);
 225         hci_dev_put(hdev);
 226         return err;
 227 }
 228
 229 static inline int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
 230 {
 231         struct sco_conn *conn = sco_pi(sk)->conn;
 232         struct sk_buff *skb;
 233         int err, count;
 234
 235         /* Check outgoing MTU */
 236         if (len > conn->mtu)
 237                 return -EINVAL;
 238
 239         BT_DBG("sk %p len %d", sk, len);
 240
 241         count = min_t(unsigned int, conn->mtu, len);
 242         if (!(skb = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err)))
 243                 return err;
 244
 245         if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
 246                 err = -EFAULT;
 247                 goto fail;
 248         }
 249
 250         if ((err = hci_send_sco(conn->hcon, skb)) < 0)
 251                 return err;
 252
 253         return count;
 254
 255 fail:
 256         kfree_skb(skb);
 257         return err;
 258 }
 259
 260 static inline void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
 261 {
 262         struct sock *sk = sco_chan_get(conn);
 263
 264         if (!sk)
 265                 goto drop;
 266
 267         BT_DBG("sk %p len %d", sk, skb->len);
 268
 269         if (sk->sk_state != BT_CONNECTED)
 270                 goto drop;
 271
 272         if (!sock_queue_rcv_skb(sk, skb))
 273                 return;
 274
 275 drop:
 276         kfree_skb(skb);
 277         return;
 278 }
 279
 280 /* -------- Socket interface ---------- */
 281 static struct sock *__sco_get_sock_by_addr(bdaddr_t *ba)
 282 {
 283         struct sock *sk;
 284         struct hlist_node *node;
 285
 286         sk_for_each(sk, node, &sco_sk_list.head)
 287                 if (!bacmp(&bt_sk(sk)->src, ba))
 288                         goto found;
 289         sk = NULL;
 290 found:
 291         return sk;
 292 }
 293
 294 /* Find socket listening on source bdaddr.
 295  * Returns closest match.
 296  */
 297 static struct sock *sco_get_sock_listen(bdaddr_t *src)
 298 {
 299         struct sock *sk = NULL, *sk1 = NULL;
 300         struct hlist_node *node;
 301
 302         read_lock(&sco_sk_list.lock);
 303
 304         sk_for_each(sk, node, &sco_sk_list.head) {
 305                 if (sk->sk_state != BT_LISTEN)
 306                         continue;
 307
 308                 /* Exact match. */
 309                 if (!bacmp(&bt_sk(sk)->src, src))
 310                         break;
 311
 312                 /* Closest match */
 313                 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
 314                         sk1 = sk;
 315         }
 316
 317         read_unlock(&sco_sk_list.lock);
 318
 319         return node ? sk : sk1;
 320 }
 321
 322 static void sco_sock_destruct(struct sock *sk)
 323 {
 324         BT_DBG("sk %p", sk);
 325
 326         skb_queue_purge(&sk->sk_receive_queue);
 327         skb_queue_purge(&sk->sk_write_queue);
 328 }
 329
 330 static void sco_sock_cleanup_listen(struct sock *parent)
 331 {
 332         struct sock *sk;
 333
 334         BT_DBG("parent %p", parent);
 335
 336         /* Close not yet accepted channels */
 337         while ((sk = bt_accept_dequeue(parent, NULL))) {
 338                 sco_sock_close(sk);
 339                 sco_sock_kill(sk);
 340         }
 341
 342         parent->sk_state  = BT_CLOSED;
 343         sock_set_flag(parent, SOCK_ZAPPED);
 344 }
 345
 346 /* Kill socket (only if zapped and orphan)
 347  * Must be called on unlocked socket.
 348  */
 349 static void sco_sock_kill(struct sock *sk)
 350 {
 351         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 352                 return;
 353
 354         BT_DBG("sk %p state %d", sk, sk->sk_state);
 355
 356         /* Kill poor orphan */
 357         bt_sock_unlink(&sco_sk_list, sk);
 358         sock_set_flag(sk, SOCK_DEAD);
 359         sock_put(sk);
 360 }
 361
 362 static void __sco_sock_close(struct sock *sk)
 363 {
 364         BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
 365
 366         switch (sk->sk_state) {
 367         case BT_LISTEN:
 368                 sco_sock_cleanup_listen(sk);
 369                 break;
 370
 371         case BT_CONNECTED:
 372         case BT_CONFIG:
 373         case BT_CONNECT:
 374         case BT_DISCONN:
 375                 sco_chan_del(sk, ECONNRESET);
 376                 break;
 377
 378         default:
 379                 sock_set_flag(sk, SOCK_ZAPPED);
 380                 break;
 381         }
 382 }
 383
 384 /* Must be called on unlocked socket. */
 385 static void sco_sock_close(struct sock *sk)
 386 {
 387         sco_sock_clear_timer(sk);
 388         lock_sock(sk);
 389         __sco_sock_close(sk);
 390         release_sock(sk);
 391         sco_sock_kill(sk);
 392 }
 393
 394 static void sco_sock_init(struct sock *sk, struct sock *parent)
 395 {
 396         BT_DBG("sk %p", sk);
 397
 398         if (parent)
 399                 sk->sk_type = parent->sk_type;
 400 }
 401
 402 static struct proto sco_proto = {
 403         .name           = "SCO",
 404         .owner          = THIS_MODULE,
 405         .obj_size       = sizeof(struct sco_pinfo)
 406 };
 407
 408 static struct sock *sco_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
 409 {
 410         struct sock *sk;
 411
 412         sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto);
 413         if (!sk)
 414                 return NULL;
 415
 416         sock_init_data(sock, sk);
 417         INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
 418
 419         sk->sk_destruct = sco_sock_destruct;
 420         sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
 421
 422         sock_reset_flag(sk, SOCK_ZAPPED);
 423
 424         sk->sk_protocol = proto;
 425         sk->sk_state    = BT_OPEN;
 426
 427         setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk);
 428
 429         bt_sock_link(&sco_sk_list, sk);
 430         return sk;
 431 }
 432
 433 static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
 434                            int kern)
 435 {
 436         struct sock *sk;
 437
 438         BT_DBG("sock %p", sock);
 439
 440         sock->state = SS_UNCONNECTED;
 441
 442         if (sock->type != SOCK_SEQPACKET)
 443                 return -ESOCKTNOSUPPORT;
 444
 445         sock->ops = &sco_sock_ops;
 446
 447         sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC);
 448         if (!sk)
 449                 return -ENOMEM;
 450
 451         sco_sock_init(sk, NULL);
 452         return 0;
 453 }
 454
 455 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 456 {
 457         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
 458         struct sock *sk = sock->sk;
 459         bdaddr_t *src = &sa->sco_bdaddr;
 460         int err = 0;
 461
 462         BT_DBG("sk %p %s", sk, batostr(&sa->sco_bdaddr));
 463
 464         if (!addr || addr->sa_family != AF_BLUETOOTH)
 465                 return -EINVAL;
 466
 467         lock_sock(sk);
 468
 469         if (sk->sk_state != BT_OPEN) {
 470                 err = -EBADFD;
 471                 goto done;
 472         }
 473
 474         write_lock_bh(&sco_sk_list.lock);
 475
 476         if (bacmp(src, BDADDR_ANY) && __sco_get_sock_by_addr(src)) {
 477                 err = -EADDRINUSE;
 478         } else {
 479                 /* Save source address */
 480                 bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
 481                 sk->sk_state = BT_BOUND;
 482         }
 483
 484         write_unlock_bh(&sco_sk_list.lock);
 485
 486 done:
 487         release_sock(sk);
 488         return err;
 489 }
 490
 491 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
 492 {
 493         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
 494         struct sock *sk = sock->sk;
 495         int err = 0;
 496
 497
 498         BT_DBG("sk %p", sk);
 499
 500         if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_sco))
 501                 return -EINVAL;
 502
 503         if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
 504                 return -EBADFD;
 505
 506         if (sk->sk_type != SOCK_SEQPACKET)
 507                 return -EINVAL;
 508
 509         lock_sock(sk);
 510
 511         /* Set destination address and psm */
 512         bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
 513
 514         if ((err = sco_connect(sk)))
 515                 goto done;
 516
 517         err = bt_sock_wait_state(sk, BT_CONNECTED,
 518                         sock_sndtimeo(sk, flags & O_NONBLOCK));
 519
 520 done:
 521         release_sock(sk);
 522         return err;
 523 }
 524
 525 static int sco_sock_listen(struct socket *sock, int backlog)
 526 {
 527         struct sock *sk = sock->sk;
 528         int err = 0;
 529
 530         BT_DBG("sk %p backlog %d", sk, backlog);
 531
 532         lock_sock(sk);
 533
 534         if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
 535                 err = -EBADFD;
 536                 goto done;
 537         }
 538
 539         sk->sk_max_ack_backlog = backlog;
 540         sk->sk_ack_backlog = 0;
 541         sk->sk_state = BT_LISTEN;
 542
 543 done:
 544         release_sock(sk);
 545         return err;
 546 }
 547
 548 static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
 549 {
 550         DECLARE_WAITQUEUE(wait, current);
 551         struct sock *sk = sock->sk, *ch;
 552         long timeo;
 553         int err = 0;
 554
 555         lock_sock(sk);
 556
 557         if (sk->sk_state != BT_LISTEN) {
 558                 err = -EBADFD;
 559                 goto done;
 560         }
 561
 562         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 563
 564         BT_DBG("sk %p timeo %ld", sk, timeo);
 565
 566         /* Wait for an incoming connection. (wake-one). */
 567         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 568         while (!(ch = bt_accept_dequeue(sk, newsock))) {
 569                 set_current_state(TASK_INTERRUPTIBLE);
 570                 if (!timeo) {
 571                         err = -EAGAIN;
 572                         break;
 573                 }
 574
 575                 release_sock(sk);
 576                 timeo = schedule_timeout(timeo);
 577                 lock_sock(sk);
 578
 579                 if (sk->sk_state != BT_LISTEN) {
 580                         err = -EBADFD;
 581                         break;
 582                 }
 583
 584                 if (signal_pending(current)) {
 585                         err = sock_intr_errno(timeo);
 586                         break;
 587                 }
 588         }
 589         set_current_state(TASK_RUNNING);
 590         remove_wait_queue(sk->sk_sleep, &wait);
 591
 592         if (err)
 593                 goto done;
 594
 595         newsock->state = SS_CONNECTED;
 596
 597         BT_DBG("new socket %p", ch);
 598
 599 done:
 600         release_sock(sk);
 601         return err;
 602 }
 603
 604 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
 605 {
 606         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
 607         struct sock *sk = sock->sk;
 608
 609         BT_DBG("sock %p, sk %p", sock, sk);
 610
 611         addr->sa_family = AF_BLUETOOTH;
 612         *len = sizeof(struct sockaddr_sco);
 613
 614         if (peer)
 615                 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
 616         else
 617                 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);
 618
 619         return 0;
 620 }
 621
 622 static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 623                             struct msghdr *msg, size_t len)
 624 {
 625         struct sock *sk = sock->sk;
 626         int err = 0;
 627
 628         BT_DBG("sock %p, sk %p", sock, sk);
 629
 630         err = sock_error(sk);
 631         if (err)
 632                 return err;
 633
 634         if (msg->msg_flags & MSG_OOB)
 635                 return -EOPNOTSUPP;
 636
 637         lock_sock(sk);
 638
 639         if (sk->sk_state == BT_CONNECTED)
 640                 err = sco_send_frame(sk, msg, len);
 641         else
 642                 err = -ENOTCONN;
 643
 644         release_sock(sk);
 645         return err;
 646 }
 647
 648 static int sco_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
 649 {
 650         struct sock *sk = sock->sk;
 651         int err = 0;
 652
 653         BT_DBG("sk %p", sk);
 654
 655         lock_sock(sk);
 656
 657         switch (optname) {
 658         default:
 659                 err = -ENOPROTOOPT;
 660                 break;
 661         }
 662
 663         release_sock(sk);
 664         return err;
 665 }
 666
 667 static int sco_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
 668 {
 669         struct sock *sk = sock->sk;
 670         struct sco_options opts;
 671         struct sco_conninfo cinfo;
 672         int len, err = 0;
 673
 674         BT_DBG("sk %p", sk);
 675
 676         if (get_user(len, optlen))
 677                 return -EFAULT;
 678
 679         lock_sock(sk);
 680
 681         switch (optname) {
 682         case SCO_OPTIONS:
 683                 if (sk->sk_state != BT_CONNECTED) {
 684                         err = -ENOTCONN;
 685                         break;
 686                 }
 687
 688                 opts.mtu = sco_pi(sk)->conn->mtu;
 689
 690                 BT_DBG("mtu %d", opts.mtu);
 691
 692                 len = min_t(unsigned int, len, sizeof(opts));
 693                 if (copy_to_user(optval, (char *)&opts, len))
 694                         err = -EFAULT;
 695
 696                 break;
 697
 698         case SCO_CONNINFO:
 699                 if (sk->sk_state != BT_CONNECTED) {
 700                         err = -ENOTCONN;
 701                         break;
 702                 }
 703
 704                 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
 705                 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
 706
 707                 len = min_t(unsigned int, len, sizeof(cinfo));
 708                 if (copy_to_user(optval, (char *)&cinfo, len))
 709                         err = -EFAULT;
 710
 711                 break;
 712
 713         default:
 714                 err = -ENOPROTOOPT;
 715                 break;
 716         }
 717
 718         release_sock(sk);
 719         return err;
 720 }
 721
 722 static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
 723 {
 724         struct sock *sk = sock->sk;
 725         int len, err = 0;
 726
 727         BT_DBG("sk %p", sk);
 728
 729         if (level == SOL_SCO)
 730                 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
 731
 732         if (get_user(len, optlen))
 733                 return -EFAULT;
 734
 735         lock_sock(sk);
 736
 737         switch (optname) {
 738         default:
 739                 err = -ENOPROTOOPT;
 740                 break;
 741         }
 742
 743         release_sock(sk);
 744         return err;
 745 }
 746
 747 static int sco_sock_shutdown(struct socket *sock, int how)
 748 {
 749         struct sock *sk = sock->sk;
 750         int err = 0;
 751
 752         BT_DBG("sock %p, sk %p", sock, sk);
 753
 754         if (!sk)
 755                 return 0;
 756
 757         lock_sock(sk);
 758         if (!sk->sk_shutdown) {
 759                 sk->sk_shutdown = SHUTDOWN_MASK;
 760                 sco_sock_clear_timer(sk);
 761                 __sco_sock_close(sk);
 762
 763                 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 764                         err = bt_sock_wait_state(sk, BT_CLOSED,
 765                                                         sk->sk_lingertime);
 766         }
 767         release_sock(sk);
 768         return err;
 769 }
 770
 771 static int sco_sock_release(struct socket *sock)
 772 {
 773         struct sock *sk = sock->sk;
 774         int err = 0;
 775
 776         BT_DBG("sock %p, sk %p", sock, sk);
 777
 778         if (!sk)
 779                 return 0;
 780
 781         sco_sock_close(sk);
 782
 783         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
 784                 lock_sock(sk);
 785                 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
 786                 release_sock(sk);
 787         }
 788
 789         sock_orphan(sk);
 790         sco_sock_kill(sk);
 791         return err;
 792 }
 793
 794 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
 795 {
 796         BT_DBG("conn %p", conn);
 797
 798         sco_pi(sk)->conn = conn;
 799         conn->sk = sk;
 800
 801         if (parent)
 802                 bt_accept_enqueue(parent, sk);
 803 }
 804
 805 /* Delete channel.
 806  * Must be called on the locked socket. */
 807 static void sco_chan_del(struct sock *sk, int err)
 808 {
 809         struct sco_conn *conn;
 810
 811         conn = sco_pi(sk)->conn;
 812
 813         BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
 814
 815         if (conn) {
 816                 sco_conn_lock(conn);
 817                 conn->sk = NULL;
 818                 sco_pi(sk)->conn = NULL;
 819                 sco_conn_unlock(conn);
 820                 hci_conn_put(conn->hcon);
 821         }
 822
 823         sk->sk_state = BT_CLOSED;
 824         sk->sk_err   = err;
 825         sk->sk_state_change(sk);
 826
 827         sock_set_flag(sk, SOCK_ZAPPED);
 828 }
 829
 830 static void sco_conn_ready(struct sco_conn *conn)
 831 {
 832         struct sock *parent, *sk;
 833
 834         BT_DBG("conn %p", conn);
 835
 836         sco_conn_lock(conn);
 837
 838         if ((sk = conn->sk)) {
 839                 sco_sock_clear_timer(sk);
 840                 bh_lock_sock(sk);
 841                 sk->sk_state = BT_CONNECTED;
 842                 sk->sk_state_change(sk);
 843                 bh_unlock_sock(sk);
 844         } else {
 845                 parent = sco_get_sock_listen(conn->src);
 846                 if (!parent)
 847                         goto done;
 848
 849                 bh_lock_sock(parent);
 850
 851                 sk = sco_sock_alloc(sock_net(parent), NULL, BTPROTO_SCO, GFP_ATOMIC);
 852                 if (!sk) {
 853                         bh_unlock_sock(parent);
 854                         goto done;
 855                 }
 856
 857                 sco_sock_init(sk, parent);
 858
 859                 bacpy(&bt_sk(sk)->src, conn->src);
 860                 bacpy(&bt_sk(sk)->dst, conn->dst);
 861
 862                 hci_conn_hold(conn->hcon);
 863                 __sco_chan_add(conn, sk, parent);
 864
 865                 sk->sk_state = BT_CONNECTED;
 866
 867                 /* Wake up parent */
 868                 parent->sk_data_ready(parent, 1);
 869
 870                 bh_unlock_sock(parent);
 871         }
 872
 873 done:
 874         sco_conn_unlock(conn);
 875 }
 876
 877 /* ----- SCO interface with lower layer (HCI) ----- */
 878 static int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 type)
 879 {
 880         register struct sock *sk;
 881         struct hlist_node *node;
 882         int lm = 0;
 883
 884         if (type != SCO_LINK && type != ESCO_LINK)
 885                 return 0;
 886
 887         BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
 888
 889         /* Find listening sockets */
 890         read_lock(&sco_sk_list.lock);
 891         sk_for_each(sk, node, &sco_sk_list.head) {
 892                 if (sk->sk_state != BT_LISTEN)
 893                         continue;
 894
 895                 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr) ||
 896                                 !bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
 897                         lm |= HCI_LM_ACCEPT;
 898                         break;
 899                 }
 900         }
 901         read_unlock(&sco_sk_list.lock);
 902
 903         return lm;
 904 }
 905
 906 static int sco_connect_cfm(struct hci_conn *hcon, __u8 status)
 907 {
 908         BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
 909
 910         if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
 911                 return 0;
 912
 913         if (!status) {
 914                 struct sco_conn *conn;
 915
 916                 conn = sco_conn_add(hcon, status);
 917                 if (conn)
 918                         sco_conn_ready(conn);
 919         } else
 920                 sco_conn_del(hcon, bt_err(status));
 921
 922         return 0;
 923 }
 924
 925 static int sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
 926 {
 927         BT_DBG("hcon %p reason %d", hcon, reason);
 928
 929         if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
 930                 return 0;
 931
 932         sco_conn_del(hcon, bt_err(reason));
 933
 934         return 0;
 935 }
 936
 937 static int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
 938 {
 939         struct sco_conn *conn = hcon->sco_data;
 940
 941         if (!conn)
 942                 goto drop;
 943
 944         BT_DBG("conn %p len %d", conn, skb->len);
 945
 946         if (skb->len) {
 947                 sco_recv_frame(conn, skb);
 948                 return 0;
 949         }
 950
 951 drop:
 952         kfree_skb(skb);
 953         return 0;
 954 }
 955
 956 static ssize_t sco_sysfs_show(struct class *dev, char *buf)
 957 {
 958         struct sock *sk;
 959         struct hlist_node *node;
 960         char *str = buf;
 961
 962         read_lock_bh(&sco_sk_list.lock);
 963
 964         sk_for_each(sk, node, &sco_sk_list.head) {
 965                 str += sprintf(str, "%s %s %d\n",
 966                                 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
 967                                 sk->sk_state);
 968         }
 969
 970         read_unlock_bh(&sco_sk_list.lock);
 971
 972         return (str - buf);
 973 }
 974
 975 static CLASS_ATTR(sco, S_IRUGO, sco_sysfs_show, NULL);
 976
 977 static const struct proto_ops sco_sock_ops = {
 978         .family         = PF_BLUETOOTH,
 979         .owner          = THIS_MODULE,
 980         .release        = sco_sock_release,
 981         .bind           = sco_sock_bind,
 982         .connect        = sco_sock_connect,
 983         .listen         = sco_sock_listen,
 984         .accept         = sco_sock_accept,
 985         .getname        = sco_sock_getname,
 986         .sendmsg        = sco_sock_sendmsg,
 987         .recvmsg        = bt_sock_recvmsg,
 988         .poll           = bt_sock_poll,
 989         .ioctl          = bt_sock_ioctl,
 990         .mmap           = sock_no_mmap,
 991         .socketpair     = sock_no_socketpair,
 992         .shutdown       = sco_sock_shutdown,
 993         .setsockopt     = sco_sock_setsockopt,
 994         .getsockopt     = sco_sock_getsockopt
 995 };
 996
 997 static const struct net_proto_family sco_sock_family_ops = {
 998         .family = PF_BLUETOOTH,
 999         .owner  = THIS_MODULE,
1000         .create = sco_sock_create,
1001 };
1002
1003 static struct hci_proto sco_hci_proto = {
1004         .name           = "SCO",
1005         .id             = HCI_PROTO_SCO,
1006         .connect_ind    = sco_connect_ind,
1007         .connect_cfm    = sco_connect_cfm,
1008         .disconn_cfm    = sco_disconn_cfm,
1009         .recv_scodata   = sco_recv_scodata
1010 };
1011
1012 static int __init sco_init(void)
1013 {
1014         int err;
1015
1016         err = proto_register(&sco_proto, 0);
1017         if (err < 0)
1018                 return err;
1019
1020         err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1021         if (err < 0) {
1022                 BT_ERR("SCO socket registration failed");
1023                 goto error;
1024         }
1025
1026         err = hci_register_proto(&sco_hci_proto);
1027         if (err < 0) {
1028                 BT_ERR("SCO protocol registration failed");
1029                 bt_sock_unregister(BTPROTO_SCO);
1030                 goto error;
1031         }
1032
1033         if (class_create_file(bt_class, &class_attr_sco) < 0)
1034                 BT_ERR("Failed to create SCO info file");
1035
1036         BT_INFO("SCO (Voice Link) ver %s", VERSION);
1037         BT_INFO("SCO socket layer initialized");
1038
1039         return 0;
1040
1041 error:
1042         proto_unregister(&sco_proto);
1043         return err;
1044 }
1045
1046 static void __exit sco_exit(void)
1047 {
1048         class_remove_file(bt_class, &class_attr_sco);
1049
1050         if (bt_sock_unregister(BTPROTO_SCO) < 0)
1051                 BT_ERR("SCO socket unregistration failed");
1052
1053         if (hci_unregister_proto(&sco_hci_proto) < 0)
1054                 BT_ERR("SCO protocol unregistration failed");
1055
1056         proto_unregister(&sco_proto);
1057 }
1058
1059 module_init(sco_init);
1060 module_exit(sco_exit);
1061
1062 module_param(disable_esco, bool, 0644);
1063 MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");
1064
1065 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1066 MODULE_DESCRIPTION("Bluetooth SCO ver " VERSION);
1067 MODULE_VERSION(VERSION);
1068 MODULE_LICENSE("GPL");
1069 MODULE_ALIAS("bt-proto-2");