net/bluetooth/hci_sock.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 HCI sockets. */
  26
  27 #include <linux/module.h>
  28
  29 #include <linux/types.h>
  30 #include <linux/capability.h>
  31 #include <linux/errno.h>
  32 #include <linux/kernel.h>
  33 #include <linux/sched.h>
  34 #include <linux/slab.h>
  35 #include <linux/poll.h>
  36 #include <linux/fcntl.h>
  37 #include <linux/init.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/workqueue.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/socket.h>
  42 #include <linux/ioctl.h>
  43 #include <net/sock.h>
  44
  45 #include <asm/system.h>
  46 #include <asm/uaccess.h>
  47 #include <asm/unaligned.h>
  48
  49 #include <net/bluetooth/bluetooth.h>
  50 #include <net/bluetooth/hci_core.h>
  51
  52 #ifndef CONFIG_BT_HCI_SOCK_DEBUG
  53 #undef  BT_DBG
  54 #define BT_DBG(D...)
  55 #endif
  56
  57 /* ----- HCI socket interface ----- */
  58
  59 static inline int hci_test_bit(int nr, void *addr)
  60 {
  61         return *((__u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));
  62 }
  63
  64 /* Security filter */
  65 static struct hci_sec_filter hci_sec_filter = {
  66         /* Packet types */
  67         0x10,
  68         /* Events */
  69         { 0x1000d9fe, 0x0000b00c },
  70         /* Commands */
  71         {
  72                 { 0x0 },
  73                 /* OGF_LINK_CTL */
  74                 { 0xbe000006, 0x00000001, 0x000000, 0x00 },
  75                 /* OGF_LINK_POLICY */
  76                 { 0x00005200, 0x00000000, 0x000000, 0x00 },
  77                 /* OGF_HOST_CTL */
  78                 { 0xaab00200, 0x2b402aaa, 0x020154, 0x00 },
  79                 /* OGF_INFO_PARAM */
  80                 { 0x000002be, 0x00000000, 0x000000, 0x00 },
  81                 /* OGF_STATUS_PARAM */
  82                 { 0x000000ea, 0x00000000, 0x000000, 0x00 }
  83         }
  84 };
  85
  86 static struct bt_sock_list hci_sk_list = {
  87         .lock = RW_LOCK_UNLOCKED
  88 };
  89
  90 /* Send frame to RAW socket */
  91 void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
  92 {
  93         struct sock *sk;
  94         struct hlist_node *node;
  95
  96         BT_DBG("hdev %p len %d", hdev, skb->len);
  97
  98         read_lock(&hci_sk_list.lock);
  99         sk_for_each(sk, node, &hci_sk_list.head) {
 100                 struct hci_filter *flt;
 101                 struct sk_buff *nskb;
 102
 103                 if (sk->sk_state != BT_BOUND || hci_pi(sk)->hdev != hdev)
 104                         continue;
 105
 106                 /* Don't send frame to the socket it came from */
 107                 if (skb->sk == sk)
 108                         continue;
 109
 110                 /* Apply filter */
 111                 flt = &hci_pi(sk)->filter;
 112
 113                 if (!test_bit((bt_cb(skb)->pkt_type == HCI_VENDOR_PKT) ?
 114                                 0 : (bt_cb(skb)->pkt_type & HCI_FLT_TYPE_BITS), &flt->type_mask))
 115                         continue;
 116
 117                 if (bt_cb(skb)->pkt_type == HCI_EVENT_PKT) {
 118                         register int evt = (*(__u8 *)skb->data & HCI_FLT_EVENT_BITS);
 119
 120                         if (!hci_test_bit(evt, &flt->event_mask))
 121                                 continue;
 122
 123                         if (flt->opcode && ((evt == HCI_EV_CMD_COMPLETE &&
 124                                         flt->opcode != *(__u16 *)(skb->data + 3)) ||
 125                                         (evt == HCI_EV_CMD_STATUS &&
 126                                         flt->opcode != *(__u16 *)(skb->data + 4))))
 127                                 continue;
 128                 }
 129
 130                 if (!(nskb = skb_clone(skb, GFP_ATOMIC)))
 131                         continue;
 132
 133                 /* Put type byte before the data */
 134                 memcpy(skb_push(nskb, 1), &bt_cb(nskb)->pkt_type, 1);
 135
 136                 if (sock_queue_rcv_skb(sk, nskb))
 137                         kfree_skb(nskb);
 138         }
 139         read_unlock(&hci_sk_list.lock);
 140 }
 141
 142 static int hci_sock_release(struct socket *sock)
 143 {
 144         struct sock *sk = sock->sk;
 145         struct hci_dev *hdev;
 146
 147         BT_DBG("sock %p sk %p", sock, sk);
 148
 149         if (!sk)
 150                 return 0;
 151
 152         hdev = hci_pi(sk)->hdev;
 153
 154         bt_sock_unlink(&hci_sk_list, sk);
 155
 156         if (hdev) {
 157                 atomic_dec(&hdev->promisc);
 158                 hci_dev_put(hdev);
 159         }
 160
 161         sock_orphan(sk);
 162
 163         skb_queue_purge(&sk->sk_receive_queue);
 164         skb_queue_purge(&sk->sk_write_queue);
 165
 166         sock_put(sk);
 167         return 0;
 168 }
 169
 170 /* Ioctls that require bound socket */
 171 static inline int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
 172 {
 173         struct hci_dev *hdev = hci_pi(sk)->hdev;
 174
 175         if (!hdev)
 176                 return -EBADFD;
 177
 178         switch (cmd) {
 179         case HCISETRAW:
 180                 if (!capable(CAP_NET_ADMIN))
 181                         return -EACCES;
 182
 183                 if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
 184                         return -EPERM;
 185
 186                 if (arg)
 187                         set_bit(HCI_RAW, &hdev->flags);
 188                 else
 189                         clear_bit(HCI_RAW, &hdev->flags);
 190
 191                 return 0;
 192
 193         case HCISETSECMGR:
 194                 if (!capable(CAP_NET_ADMIN))
 195                         return -EACCES;
 196
 197                 if (arg)
 198                         set_bit(HCI_SECMGR, &hdev->flags);
 199                 else
 200                         clear_bit(HCI_SECMGR, &hdev->flags);
 201
 202                 return 0;
 203
 204         case HCIGETCONNINFO:
 205                 return hci_get_conn_info(hdev, (void __user *)arg);
 206
 207         default:
 208                 if (hdev->ioctl)
 209                         return hdev->ioctl(hdev, cmd, arg);
 210                 return -EINVAL;
 211         }
 212 }
 213
 214 static int hci_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 215 {
 216         struct sock *sk = sock->sk;
 217         void __user *argp = (void __user *)arg;
 218         int err;
 219
 220         BT_DBG("cmd %x arg %lx", cmd, arg);
 221
 222         switch (cmd) {
 223         case HCIGETDEVLIST:
 224                 return hci_get_dev_list(argp);
 225
 226         case HCIGETDEVINFO:
 227                 return hci_get_dev_info(argp);
 228
 229         case HCIGETCONNLIST:
 230                 return hci_get_conn_list(argp);
 231
 232         case HCIDEVUP:
 233                 if (!capable(CAP_NET_ADMIN))
 234                         return -EACCES;
 235                 return hci_dev_open(arg);
 236
 237         case HCIDEVDOWN:
 238                 if (!capable(CAP_NET_ADMIN))
 239                         return -EACCES;
 240                 return hci_dev_close(arg);
 241
 242         case HCIDEVRESET:
 243                 if (!capable(CAP_NET_ADMIN))
 244                         return -EACCES;
 245                 return hci_dev_reset(arg);
 246
 247         case HCIDEVRESTAT:
 248                 if (!capable(CAP_NET_ADMIN))
 249                         return -EACCES;
 250                 return hci_dev_reset_stat(arg);
 251
 252         case HCISETSCAN:
 253         case HCISETAUTH:
 254         case HCISETENCRYPT:
 255         case HCISETPTYPE:
 256         case HCISETLINKPOL:
 257         case HCISETLINKMODE:
 258         case HCISETACLMTU:
 259         case HCISETSCOMTU:
 260                 if (!capable(CAP_NET_ADMIN))
 261                         return -EACCES;
 262                 return hci_dev_cmd(cmd, argp);
 263
 264         case HCIINQUIRY:
 265                 return hci_inquiry(argp);
 266
 267         default:
 268                 lock_sock(sk);
 269                 err = hci_sock_bound_ioctl(sk, cmd, arg);
 270                 release_sock(sk);
 271                 return err;
 272         }
 273 }
 274
 275 static int hci_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 276 {
 277         struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
 278         struct sock *sk = sock->sk;
 279         struct hci_dev *hdev = NULL;
 280         int err = 0;
 281
 282         BT_DBG("sock %p sk %p", sock, sk);
 283
 284         if (!haddr || haddr->hci_family != AF_BLUETOOTH)
 285                 return -EINVAL;
 286
 287         lock_sock(sk);
 288
 289         if (hci_pi(sk)->hdev) {
 290                 err = -EALREADY;
 291                 goto done;
 292         }
 293
 294         if (haddr->hci_dev != HCI_DEV_NONE) {
 295                 if (!(hdev = hci_dev_get(haddr->hci_dev))) {
 296                         err = -ENODEV;
 297                         goto done;
 298                 }
 299
 300                 atomic_inc(&hdev->promisc);
 301         }
 302
 303         hci_pi(sk)->hdev = hdev;
 304         sk->sk_state = BT_BOUND;
 305
 306 done:
 307         release_sock(sk);
 308         return err;
 309 }
 310
 311 static int hci_sock_getname(struct socket *sock, struct sockaddr *addr, int *addr_len, int peer)
 312 {
 313         struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
 314         struct sock *sk = sock->sk;
 315         struct hci_dev *hdev = hci_pi(sk)->hdev;
 316
 317         BT_DBG("sock %p sk %p", sock, sk);
 318
 319         if (!hdev)
 320                 return -EBADFD;
 321
 322         lock_sock(sk);
 323
 324         *addr_len = sizeof(*haddr);
 325         haddr->hci_family = AF_BLUETOOTH;
 326         haddr->hci_dev    = hdev->id;
 327
 328         release_sock(sk);
 329         return 0;
 330 }
 331
 332 static inline void hci_sock_cmsg(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
 333 {
 334         __u32 mask = hci_pi(sk)->cmsg_mask;
 335
 336         if (mask & HCI_CMSG_DIR) {
 337                 int incoming = bt_cb(skb)->incoming;
 338                 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming), &incoming);
 339         }
 340
 341         if (mask & HCI_CMSG_TSTAMP) {
 342                 struct timeval tv;
 343
 344                 skb_get_timestamp(skb, &tv);
 345                 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, sizeof(tv), &tv);
 346         }
 347 }
 348
 349 static int hci_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 350                                 struct msghdr *msg, size_t len, int flags)
 351 {
 352         int noblock = flags & MSG_DONTWAIT;
 353         struct sock *sk = sock->sk;
 354         struct sk_buff *skb;
 355         int copied, err;
 356
 357         BT_DBG("sock %p, sk %p", sock, sk);
 358
 359         if (flags & (MSG_OOB))
 360                 return -EOPNOTSUPP;
 361
 362         if (sk->sk_state == BT_CLOSED)
 363                 return 0;
 364
 365         if (!(skb = skb_recv_datagram(sk, flags, noblock, &err)))
 366                 return err;
 367
 368         msg->msg_namelen = 0;
 369
 370         copied = skb->len;
 371         if (len < copied) {
 372                 msg->msg_flags |= MSG_TRUNC;
 373                 copied = len;
 374         }
 375
 376         skb->h.raw = skb->data;
 377         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 378
 379         hci_sock_cmsg(sk, msg, skb);
 380
 381         skb_free_datagram(sk, skb);
 382
 383         return err ? : copied;
 384 }
 385
 386 static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 387                             struct msghdr *msg, size_t len)
 388 {
 389         struct sock *sk = sock->sk;
 390         struct hci_dev *hdev;
 391         struct sk_buff *skb;
 392         int err;
 393
 394         BT_DBG("sock %p sk %p", sock, sk);
 395
 396         if (msg->msg_flags & MSG_OOB)
 397                 return -EOPNOTSUPP;
 398
 399         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
 400                 return -EINVAL;
 401
 402         if (len < 4 || len > HCI_MAX_FRAME_SIZE)
 403                 return -EINVAL;
 404
 405         lock_sock(sk);
 406
 407         if (!(hdev = hci_pi(sk)->hdev)) {
 408                 err = -EBADFD;
 409                 goto done;
 410         }
 411
 412         if (!(skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err)))
 413                 goto done;
 414
 415         if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
 416                 err = -EFAULT;
 417                 goto drop;
 418         }
 419
 420         bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
 421         skb_pull(skb, 1);
 422         skb->dev = (void *) hdev;
 423
 424         if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
 425                 u16 opcode = __le16_to_cpu(get_unaligned((__le16 *) skb->data));
 426                 u16 ogf = hci_opcode_ogf(opcode);
 427                 u16 ocf = hci_opcode_ocf(opcode);
 428
 429                 if (((ogf > HCI_SFLT_MAX_OGF) ||
 430                                 !hci_test_bit(ocf & HCI_FLT_OCF_BITS, &hci_sec_filter.ocf_mask[ogf])) &&
 431                                         !capable(CAP_NET_RAW)) {
 432                         err = -EPERM;
 433                         goto drop;
 434                 }
 435
 436                 if (test_bit(HCI_RAW, &hdev->flags) || (ogf == OGF_VENDOR_CMD)) {
 437                         skb_queue_tail(&hdev->raw_q, skb);
 438                         hci_sched_tx(hdev);
 439                 } else {
 440                         skb_queue_tail(&hdev->cmd_q, skb);
 441                         hci_sched_cmd(hdev);
 442                 }
 443         } else {
 444                 if (!capable(CAP_NET_RAW)) {
 445                         err = -EPERM;
 446                         goto drop;
 447                 }
 448
 449                 skb_queue_tail(&hdev->raw_q, skb);
 450                 hci_sched_tx(hdev);
 451         }
 452
 453         err = len;
 454
 455 done:
 456         release_sock(sk);
 457         return err;
 458
 459 drop:
 460         kfree_skb(skb);
 461         goto done;
 462 }
 463
 464 static int hci_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int len)
 465 {
 466         struct hci_ufilter uf = { .opcode = 0 };
 467         struct sock *sk = sock->sk;
 468         int err = 0, opt = 0;
 469
 470         BT_DBG("sk %p, opt %d", sk, optname);
 471
 472         lock_sock(sk);
 473
 474         switch (optname) {
 475         case HCI_DATA_DIR:
 476                 if (get_user(opt, (int __user *)optval)) {
 477                         err = -EFAULT;
 478                         break;
 479                 }
 480
 481                 if (opt)
 482                         hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
 483                 else
 484                         hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
 485                 break;
 486
 487         case HCI_TIME_STAMP:
 488                 if (get_user(opt, (int __user *)optval)) {
 489                         err = -EFAULT;
 490                         break;
 491                 }
 492
 493                 if (opt)
 494                         hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
 495                 else
 496                         hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
 497                 break;
 498
 499         case HCI_FILTER:
 500                 len = min_t(unsigned int, len, sizeof(uf));
 501                 if (copy_from_user(&uf, optval, len)) {
 502                         err = -EFAULT;
 503                         break;
 504                 }
 505
 506                 if (!capable(CAP_NET_RAW)) {
 507                         uf.type_mask &= hci_sec_filter.type_mask;
 508                         uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
 509                         uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
 510                 }
 511
 512                 {
 513                         struct hci_filter *f = &hci_pi(sk)->filter;
 514
 515                         f->type_mask = uf.type_mask;
 516                         f->opcode    = uf.opcode;
 517                         *((u32 *) f->event_mask + 0) = uf.event_mask[0];
 518                         *((u32 *) f->event_mask + 1) = uf.event_mask[1];
 519                 }
 520                 break;
 521
 522         default:
 523                 err = -ENOPROTOOPT;
 524                 break;
 525         }
 526
 527         release_sock(sk);
 528         return err;
 529 }
 530
 531 static int hci_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
 532 {
 533         struct hci_ufilter uf;
 534         struct sock *sk = sock->sk;
 535         int len, opt;
 536
 537         if (get_user(len, optlen))
 538                 return -EFAULT;
 539
 540         switch (optname) {
 541         case HCI_DATA_DIR:
 542                 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
 543                         opt = 1;
 544                 else
 545                         opt = 0;
 546
 547                 if (put_user(opt, optval))
 548                         return -EFAULT;
 549                 break;
 550
 551         case HCI_TIME_STAMP:
 552                 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
 553                         opt = 1;
 554                 else
 555                         opt = 0;
 556
 557                 if (put_user(opt, optval))
 558                         return -EFAULT;
 559                 break;
 560
 561         case HCI_FILTER:
 562                 {
 563                         struct hci_filter *f = &hci_pi(sk)->filter;
 564
 565                         uf.type_mask = f->type_mask;
 566                         uf.opcode    = f->opcode;
 567                         uf.event_mask[0] = *((u32 *) f->event_mask + 0);
 568                         uf.event_mask[1] = *((u32 *) f->event_mask + 1);
 569                 }
 570
 571                 len = min_t(unsigned int, len, sizeof(uf));
 572                 if (copy_to_user(optval, &uf, len))
 573                         return -EFAULT;
 574                 break;
 575
 576         default:
 577                 return -ENOPROTOOPT;
 578                 break;
 579         }
 580
 581         return 0;
 582 }
 583
 584 static const struct proto_ops hci_sock_ops = {
 585         .family         = PF_BLUETOOTH,
 586         .owner          = THIS_MODULE,
 587         .release        = hci_sock_release,
 588         .bind           = hci_sock_bind,
 589         .getname        = hci_sock_getname,
 590         .sendmsg        = hci_sock_sendmsg,
 591         .recvmsg        = hci_sock_recvmsg,
 592         .ioctl          = hci_sock_ioctl,
 593         .poll           = datagram_poll,
 594         .listen         = sock_no_listen,
 595         .shutdown       = sock_no_shutdown,
 596         .setsockopt     = hci_sock_setsockopt,
 597         .getsockopt     = hci_sock_getsockopt,
 598         .connect        = sock_no_connect,
 599         .socketpair     = sock_no_socketpair,
 600         .accept         = sock_no_accept,
 601         .mmap           = sock_no_mmap
 602 };
 603
 604 static struct proto hci_sk_proto = {
 605         .name           = "HCI",
 606         .owner          = THIS_MODULE,
 607         .obj_size       = sizeof(struct hci_pinfo)
 608 };
 609
 610 static int hci_sock_create(struct socket *sock, int protocol)
 611 {
 612         struct sock *sk;
 613
 614         BT_DBG("sock %p", sock);
 615
 616         if (sock->type != SOCK_RAW)
 617                 return -ESOCKTNOSUPPORT;
 618
 619         sock->ops = &hci_sock_ops;
 620
 621         sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &hci_sk_proto, 1);
 622         if (!sk)
 623                 return -ENOMEM;
 624
 625         sock_init_data(sock, sk);
 626
 627         sock_reset_flag(sk, SOCK_ZAPPED);
 628
 629         sk->sk_protocol = protocol;
 630
 631         sock->state = SS_UNCONNECTED;
 632         sk->sk_state = BT_OPEN;
 633
 634         bt_sock_link(&hci_sk_list, sk);
 635         return 0;
 636 }
 637
 638 static int hci_sock_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
 639 {
 640         struct hci_dev *hdev = (struct hci_dev *) ptr;
 641         struct hci_ev_si_device ev;
 642
 643         BT_DBG("hdev %s event %ld", hdev->name, event);
 644
 645         /* Send event to sockets */
 646         ev.event  = event;
 647         ev.dev_id = hdev->id;
 648         hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);
 649
 650         if (event == HCI_DEV_UNREG) {
 651                 struct sock *sk;
 652                 struct hlist_node *node;
 653
 654                 /* Detach sockets from device */
 655                 read_lock(&hci_sk_list.lock);
 656                 sk_for_each(sk, node, &hci_sk_list.head) {
 657                         bh_lock_sock(sk);
 658                         if (hci_pi(sk)->hdev == hdev) {
 659                                 hci_pi(sk)->hdev = NULL;
 660                                 sk->sk_err = EPIPE;
 661                                 sk->sk_state = BT_OPEN;
 662                                 sk->sk_state_change(sk);
 663
 664                                 hci_dev_put(hdev);
 665                         }
 666                         bh_unlock_sock(sk);
 667                 }
 668                 read_unlock(&hci_sk_list.lock);
 669         }
 670
 671         return NOTIFY_DONE;
 672 }
 673
 674 static struct net_proto_family hci_sock_family_ops = {
 675         .family = PF_BLUETOOTH,
 676         .owner  = THIS_MODULE,
 677         .create = hci_sock_create,
 678 };
 679
 680 static struct notifier_block hci_sock_nblock = {
 681         .notifier_call = hci_sock_dev_event
 682 };
 683
 684 int __init hci_sock_init(void)
 685 {
 686         int err;
 687
 688         err = proto_register(&hci_sk_proto, 0);
 689         if (err < 0)
 690                 return err;
 691
 692         err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
 693         if (err < 0)
 694                 goto error;
 695
 696         hci_register_notifier(&hci_sock_nblock);
 697
 698         BT_INFO("HCI socket layer initialized");
 699
 700         return 0;
 701
 702 error:
 703         BT_ERR("HCI socket registration failed");
 704         proto_unregister(&hci_sk_proto);
 705         return err;
 706 }
 707
 708 int __exit hci_sock_cleanup(void)
 709 {
 710         if (bt_sock_unregister(BTPROTO_HCI) < 0)
 711                 BT_ERR("HCI socket unregistration failed");
 712
 713         hci_unregister_notifier(&hci_sock_nblock);
 714
 715         proto_unregister(&hci_sk_proto);
 716
 717         return 0;
 718 }