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