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/slab.h>
  34 #include <linux/poll.h>
  35 #include <linux/fcntl.h>
  36 #include <linux/init.h>
  37 #include <linux/skbuff.h>
  38 #include <linux/workqueue.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/compat.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, 0x00000000, 0x00 },
  75                 /* OGF_LINK_POLICY */
  76                 { 0x00005200, 0x00000000, 0x00000000, 0x00 },
  77                 /* OGF_HOST_CTL */
  78                 { 0xaab00200, 0x2b402aaa, 0x05220154, 0x00 },
  79                 /* OGF_INFO_PARAM */
  80                 { 0x000002be, 0x00000000, 0x00000000, 0x00 },
  81                 /* OGF_STATUS_PARAM */
  82                 { 0x000000ea, 0x00000000, 0x00000000, 0x00 }
  83         }
  84 };
  85
  86 static struct bt_sock_list hci_sk_list = {
  87         .lock = __RW_LOCK_UNLOCKED(hci_sk_list.lock)
  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 &&
 124                             ((evt == HCI_EV_CMD_COMPLETE &&
 125                               flt->opcode !=
 126                               get_unaligned((__le16 *)(skb->data + 3))) ||
 127                              (evt == HCI_EV_CMD_STATUS &&
 128                               flt->opcode !=
 129                               get_unaligned((__le16 *)(skb->data + 4)))))
 130                                 continue;
 131                 }
 132
 133                 if (!(nskb = skb_clone(skb, GFP_ATOMIC)))
 134                         continue;
 135
 136                 /* Put type byte before the data */
 137                 memcpy(skb_push(nskb, 1), &bt_cb(nskb)->pkt_type, 1);
 138
 139                 if (sock_queue_rcv_skb(sk, nskb))
 140                         kfree_skb(nskb);
 141         }
 142         read_unlock(&hci_sk_list.lock);
 143 }
 144
 145 static int hci_sock_release(struct socket *sock)
 146 {
 147         struct sock *sk = sock->sk;
 148         struct hci_dev *hdev;
 149
 150         BT_DBG("sock %p sk %p", sock, sk);
 151
 152         if (!sk)
 153                 return 0;
 154
 155         hdev = hci_pi(sk)->hdev;
 156
 157         bt_sock_unlink(&hci_sk_list, sk);
 158
 159         if (hdev) {
 160                 atomic_dec(&hdev->promisc);
 161                 hci_dev_put(hdev);
 162         }
 163
 164         sock_orphan(sk);
 165
 166         skb_queue_purge(&sk->sk_receive_queue);
 167         skb_queue_purge(&sk->sk_write_queue);
 168
 169         sock_put(sk);
 170         return 0;
 171 }
 172
 173 /* Ioctls that require bound socket */
 174 static inline int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
 175 {
 176         struct hci_dev *hdev = hci_pi(sk)->hdev;
 177
 178         if (!hdev)
 179                 return -EBADFD;
 180
 181         switch (cmd) {
 182         case HCISETRAW:
 183                 if (!capable(CAP_NET_ADMIN))
 184                         return -EACCES;
 185
 186                 if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
 187                         return -EPERM;
 188
 189                 if (arg)
 190                         set_bit(HCI_RAW, &hdev->flags);
 191                 else
 192                         clear_bit(HCI_RAW, &hdev->flags);
 193
 194                 return 0;
 195
 196         case HCISETSECMGR:
 197                 if (!capable(CAP_NET_ADMIN))
 198                         return -EACCES;
 199
 200                 if (arg)
 201                         set_bit(HCI_SECMGR, &hdev->flags);
 202                 else
 203                         clear_bit(HCI_SECMGR, &hdev->flags);
 204
 205                 return 0;
 206
 207         case HCIGETCONNINFO:
 208                 return hci_get_conn_info(hdev, (void __user *)arg);
 209
 210         default:
 211                 if (hdev->ioctl)
 212                         return hdev->ioctl(hdev, cmd, arg);
 213                 return -EINVAL;
 214         }
 215 }
 216
 217 static int hci_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 218 {
 219         struct sock *sk = sock->sk;
 220         void __user *argp = (void __user *)arg;
 221         int err;
 222
 223         BT_DBG("cmd %x arg %lx", cmd, arg);
 224
 225         switch (cmd) {
 226         case HCIGETDEVLIST:
 227                 return hci_get_dev_list(argp);
 228
 229         case HCIGETDEVINFO:
 230                 return hci_get_dev_info(argp);
 231
 232         case HCIGETCONNLIST:
 233                 return hci_get_conn_list(argp);
 234
 235         case HCIDEVUP:
 236                 if (!capable(CAP_NET_ADMIN))
 237                         return -EACCES;
 238                 return hci_dev_open(arg);
 239
 240         case HCIDEVDOWN:
 241                 if (!capable(CAP_NET_ADMIN))
 242                         return -EACCES;
 243                 return hci_dev_close(arg);
 244
 245         case HCIDEVRESET:
 246                 if (!capable(CAP_NET_ADMIN))
 247                         return -EACCES;
 248                 return hci_dev_reset(arg);
 249
 250         case HCIDEVRESTAT:
 251                 if (!capable(CAP_NET_ADMIN))
 252                         return -EACCES;
 253                 return hci_dev_reset_stat(arg);
 254
 255         case HCISETSCAN:
 256         case HCISETAUTH:
 257         case HCISETENCRYPT:
 258         case HCISETPTYPE:
 259         case HCISETLINKPOL:
 260         case HCISETLINKMODE:
 261         case HCISETACLMTU:
 262         case HCISETSCOMTU:
 263                 if (!capable(CAP_NET_ADMIN))
 264                         return -EACCES;
 265                 return hci_dev_cmd(cmd, argp);
 266
 267         case HCIINQUIRY:
 268                 return hci_inquiry(argp);
 269
 270         default:
 271                 lock_sock(sk);
 272                 err = hci_sock_bound_ioctl(sk, cmd, arg);
 273                 release_sock(sk);
 274                 return err;
 275         }
 276 }
 277
 278 static int hci_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 279 {
 280         struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
 281         struct sock *sk = sock->sk;
 282         struct hci_dev *hdev = NULL;
 283         int err = 0;
 284
 285         BT_DBG("sock %p sk %p", sock, sk);
 286
 287         if (!haddr || haddr->hci_family != AF_BLUETOOTH)
 288                 return -EINVAL;
 289
 290         lock_sock(sk);
 291
 292         if (hci_pi(sk)->hdev) {
 293                 err = -EALREADY;
 294                 goto done;
 295         }
 296
 297         if (haddr->hci_dev != HCI_DEV_NONE) {
 298                 if (!(hdev = hci_dev_get(haddr->hci_dev))) {
 299                         err = -ENODEV;
 300                         goto done;
 301                 }
 302
 303                 atomic_inc(&hdev->promisc);
 304         }
 305
 306         hci_pi(sk)->hdev = hdev;
 307         sk->sk_state = BT_BOUND;
 308
 309 done:
 310         release_sock(sk);
 311         return err;
 312 }
 313
 314 static int hci_sock_getname(struct socket *sock, struct sockaddr *addr, int *addr_len, int peer)
 315 {
 316         struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
 317         struct sock *sk = sock->sk;
 318         struct hci_dev *hdev = hci_pi(sk)->hdev;
 319
 320         BT_DBG("sock %p sk %p", sock, sk);
 321
 322         if (!hdev)
 323                 return -EBADFD;
 324
 325         lock_sock(sk);
 326
 327         *addr_len = sizeof(*haddr);
 328         haddr->hci_family = AF_BLUETOOTH;
 329         haddr->hci_dev    = hdev->id;
 330
 331         release_sock(sk);
 332         return 0;
 333 }
 334
 335 static inline void hci_sock_cmsg(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
 336 {
 337         __u32 mask = hci_pi(sk)->cmsg_mask;
 338
 339         if (mask & HCI_CMSG_DIR) {
 340                 int incoming = bt_cb(skb)->incoming;
 341                 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming), &incoming);
 342         }
 343
 344         if (mask & HCI_CMSG_TSTAMP) {
 345                 struct timeval tv;
 346                 void *data;
 347                 int len;
 348
 349                 skb_get_timestamp(skb, &tv);
 350
 351                 data = &tv;
 352                 len = sizeof(tv);
 353 #ifdef CONFIG_COMPAT
 354                 if (msg->msg_flags & MSG_CMSG_COMPAT) {
 355                         struct compat_timeval ctv;
 356                         ctv.tv_sec = tv.tv_sec;
 357                         ctv.tv_usec = tv.tv_usec;
 358                         data = &ctv;
 359                         len = sizeof(ctv);
 360                 }
 361 #endif
 362
 363                 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
 364         }
 365 }
 366
 367 static int hci_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 368                                 struct msghdr *msg, size_t len, int flags)
 369 {
 370         int noblock = flags & MSG_DONTWAIT;
 371         struct sock *sk = sock->sk;
 372         struct sk_buff *skb;
 373         int copied, err;
 374
 375         BT_DBG("sock %p, sk %p", sock, sk);
 376
 377         if (flags & (MSG_OOB))
 378                 return -EOPNOTSUPP;
 379
 380         if (sk->sk_state == BT_CLOSED)
 381                 return 0;
 382
 383         if (!(skb = skb_recv_datagram(sk, flags, noblock, &err)))
 384                 return err;
 385
 386         msg->msg_namelen = 0;
 387
 388         copied = skb->len;
 389         if (len < copied) {
 390                 msg->msg_flags |= MSG_TRUNC;
 391                 copied = len;
 392         }
 393
 394         skb_reset_transport_header(skb);
 395         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 396
 397         hci_sock_cmsg(sk, msg, skb);
 398
 399         skb_free_datagram(sk, skb);
 400
 401         return err ? : copied;
 402 }
 403
 404 static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 405                             struct msghdr *msg, size_t len)
 406 {
 407         struct sock *sk = sock->sk;
 408         struct hci_dev *hdev;
 409         struct sk_buff *skb;
 410         int err;
 411
 412         BT_DBG("sock %p sk %p", sock, sk);
 413
 414         if (msg->msg_flags & MSG_OOB)
 415                 return -EOPNOTSUPP;
 416
 417         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
 418                 return -EINVAL;
 419
 420         if (len < 4 || len > HCI_MAX_FRAME_SIZE)
 421                 return -EINVAL;
 422
 423         lock_sock(sk);
 424
 425         if (!(hdev = hci_pi(sk)->hdev)) {
 426                 err = -EBADFD;
 427                 goto done;
 428         }
 429
 430         if (!(skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err)))
 431                 goto done;
 432
 433         if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
 434                 err = -EFAULT;
 435                 goto drop;
 436         }
 437
 438         bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
 439         skb_pull(skb, 1);
 440         skb->dev = (void *) hdev;
 441
 442         if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
 443                 u16 opcode = __le16_to_cpu(get_unaligned((__le16 *) skb->data));
 444                 u16 ogf = hci_opcode_ogf(opcode);
 445                 u16 ocf = hci_opcode_ocf(opcode);
 446
 447                 if (((ogf > HCI_SFLT_MAX_OGF) ||
 448                                 !hci_test_bit(ocf & HCI_FLT_OCF_BITS, &hci_sec_filter.ocf_mask[ogf])) &&
 449                                         !capable(CAP_NET_RAW)) {
 450                         err = -EPERM;
 451                         goto drop;
 452                 }
 453
 454                 if (test_bit(HCI_RAW, &hdev->flags) || (ogf == 0x3f)) {
 455                         skb_queue_tail(&hdev->raw_q, skb);
 456                         hci_sched_tx(hdev);
 457                 } else {
 458                         skb_queue_tail(&hdev->cmd_q, skb);
 459                         hci_sched_cmd(hdev);
 460                 }
 461         } else {
 462                 if (!capable(CAP_NET_RAW)) {
 463                         err = -EPERM;
 464                         goto drop;
 465                 }
 466
 467                 skb_queue_tail(&hdev->raw_q, skb);
 468                 hci_sched_tx(hdev);
 469         }
 470
 471         err = len;
 472
 473 done:
 474         release_sock(sk);
 475         return err;
 476
 477 drop:
 478         kfree_skb(skb);
 479         goto done;
 480 }
 481
 482 static int hci_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int len)
 483 {
 484         struct hci_ufilter uf = { .opcode = 0 };
 485         struct sock *sk = sock->sk;
 486         int err = 0, opt = 0;
 487
 488         BT_DBG("sk %p, opt %d", sk, optname);
 489
 490         lock_sock(sk);
 491
 492         switch (optname) {
 493         case HCI_DATA_DIR:
 494                 if (get_user(opt, (int __user *)optval)) {
 495                         err = -EFAULT;
 496                         break;
 497                 }
 498
 499                 if (opt)
 500                         hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
 501                 else
 502                         hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
 503                 break;
 504
 505         case HCI_TIME_STAMP:
 506                 if (get_user(opt, (int __user *)optval)) {
 507                         err = -EFAULT;
 508                         break;
 509                 }
 510
 511                 if (opt)
 512                         hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
 513                 else
 514                         hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
 515                 break;
 516
 517         case HCI_FILTER:
 518                 {
 519                         struct hci_filter *f = &hci_pi(sk)->filter;
 520
 521                         uf.type_mask = f->type_mask;
 522                         uf.opcode    = f->opcode;
 523                         uf.event_mask[0] = *((u32 *) f->event_mask + 0);
 524                         uf.event_mask[1] = *((u32 *) f->event_mask + 1);
 525                 }
 526
 527                 len = min_t(unsigned int, len, sizeof(uf));
 528                 if (copy_from_user(&uf, optval, len)) {
 529                         err = -EFAULT;
 530                         break;
 531                 }
 532
 533                 if (!capable(CAP_NET_RAW)) {
 534                         uf.type_mask &= hci_sec_filter.type_mask;
 535                         uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
 536                         uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
 537                 }
 538
 539                 {
 540                         struct hci_filter *f = &hci_pi(sk)->filter;
 541
 542                         f->type_mask = uf.type_mask;
 543                         f->opcode    = uf.opcode;
 544                         *((u32 *) f->event_mask + 0) = uf.event_mask[0];
 545                         *((u32 *) f->event_mask + 1) = uf.event_mask[1];
 546                 }
 547                 break;
 548
 549         default:
 550                 err = -ENOPROTOOPT;
 551                 break;
 552         }
 553
 554         release_sock(sk);
 555         return err;
 556 }
 557
 558 static int hci_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
 559 {
 560         struct hci_ufilter uf;
 561         struct sock *sk = sock->sk;
 562         int len, opt;
 563
 564         if (get_user(len, optlen))
 565                 return -EFAULT;
 566
 567         switch (optname) {
 568         case HCI_DATA_DIR:
 569                 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
 570                         opt = 1;
 571                 else
 572                         opt = 0;
 573
 574                 if (put_user(opt, optval))
 575                         return -EFAULT;
 576                 break;
 577
 578         case HCI_TIME_STAMP:
 579                 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
 580                         opt = 1;
 581                 else
 582                         opt = 0;
 583
 584                 if (put_user(opt, optval))
 585                         return -EFAULT;
 586                 break;
 587
 588         case HCI_FILTER:
 589                 {
 590                         struct hci_filter *f = &hci_pi(sk)->filter;
 591
 592                         uf.type_mask = f->type_mask;
 593                         uf.opcode    = f->opcode;
 594                         uf.event_mask[0] = *((u32 *) f->event_mask + 0);
 595                         uf.event_mask[1] = *((u32 *) f->event_mask + 1);
 596                 }
 597
 598                 len = min_t(unsigned int, len, sizeof(uf));
 599                 if (copy_to_user(optval, &uf, len))
 600                         return -EFAULT;
 601                 break;
 602
 603         default:
 604                 return -ENOPROTOOPT;
 605                 break;
 606         }
 607
 608         return 0;
 609 }
 610
 611 static const struct proto_ops hci_sock_ops = {
 612         .family         = PF_BLUETOOTH,
 613         .owner          = THIS_MODULE,
 614         .release        = hci_sock_release,
 615         .bind           = hci_sock_bind,
 616         .getname        = hci_sock_getname,
 617         .sendmsg        = hci_sock_sendmsg,
 618         .recvmsg        = hci_sock_recvmsg,
 619         .ioctl          = hci_sock_ioctl,
 620         .poll           = datagram_poll,
 621         .listen         = sock_no_listen,
 622         .shutdown       = sock_no_shutdown,
 623         .setsockopt     = hci_sock_setsockopt,
 624         .getsockopt     = hci_sock_getsockopt,
 625         .connect        = sock_no_connect,
 626         .socketpair     = sock_no_socketpair,
 627         .accept         = sock_no_accept,
 628         .mmap           = sock_no_mmap
 629 };
 630
 631 static struct proto hci_sk_proto = {
 632         .name           = "HCI",
 633         .owner          = THIS_MODULE,
 634         .obj_size       = sizeof(struct hci_pinfo)
 635 };
 636
 637 static int hci_sock_create(struct net *net, struct socket *sock, int protocol)
 638 {
 639         struct sock *sk;
 640
 641         BT_DBG("sock %p", sock);
 642
 643         if (sock->type != SOCK_RAW)
 644                 return -ESOCKTNOSUPPORT;
 645
 646         sock->ops = &hci_sock_ops;
 647
 648         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto);
 649         if (!sk)
 650                 return -ENOMEM;
 651
 652         sock_init_data(sock, sk);
 653
 654         sock_reset_flag(sk, SOCK_ZAPPED);
 655
 656         sk->sk_protocol = protocol;
 657
 658         sock->state = SS_UNCONNECTED;
 659         sk->sk_state = BT_OPEN;
 660
 661         bt_sock_link(&hci_sk_list, sk);
 662         return 0;
 663 }
 664
 665 static int hci_sock_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
 666 {
 667         struct hci_dev *hdev = (struct hci_dev *) ptr;
 668         struct hci_ev_si_device ev;
 669
 670         BT_DBG("hdev %s event %ld", hdev->name, event);
 671
 672         /* Send event to sockets */
 673         ev.event  = event;
 674         ev.dev_id = hdev->id;
 675         hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);
 676
 677         if (event == HCI_DEV_UNREG) {
 678                 struct sock *sk;
 679                 struct hlist_node *node;
 680
 681                 /* Detach sockets from device */
 682                 read_lock(&hci_sk_list.lock);
 683                 sk_for_each(sk, node, &hci_sk_list.head) {
 684                         local_bh_disable();
 685                         bh_lock_sock_nested(sk);
 686                         if (hci_pi(sk)->hdev == hdev) {
 687                                 hci_pi(sk)->hdev = NULL;
 688                                 sk->sk_err = EPIPE;
 689                                 sk->sk_state = BT_OPEN;
 690                                 sk->sk_state_change(sk);
 691
 692                                 hci_dev_put(hdev);
 693                         }
 694                         bh_unlock_sock(sk);
 695                         local_bh_enable();
 696                 }
 697                 read_unlock(&hci_sk_list.lock);
 698         }
 699
 700         return NOTIFY_DONE;
 701 }
 702
 703 static struct net_proto_family hci_sock_family_ops = {
 704         .family = PF_BLUETOOTH,
 705         .owner  = THIS_MODULE,
 706         .create = hci_sock_create,
 707 };
 708
 709 static struct notifier_block hci_sock_nblock = {
 710         .notifier_call = hci_sock_dev_event
 711 };
 712
 713 int __init hci_sock_init(void)
 714 {
 715         int err;
 716
 717         err = proto_register(&hci_sk_proto, 0);
 718         if (err < 0)
 719                 return err;
 720
 721         err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
 722         if (err < 0)
 723                 goto error;
 724
 725         hci_register_notifier(&hci_sock_nblock);
 726
 727         BT_INFO("HCI socket layer initialized");
 728
 729         return 0;
 730
 731 error:
 732         BT_ERR("HCI socket registration failed");
 733         proto_unregister(&hci_sk_proto);
 734         return err;
 735 }
 736
 737 void __exit hci_sock_cleanup(void)
 738 {
 739         if (bt_sock_unregister(BTPROTO_HCI) < 0)
 740                 BT_ERR("HCI socket unregistration failed");
 741
 742         hci_unregister_notifier(&hci_sock_nblock);
 743
 744         proto_unregister(&hci_sk_proto);
 745 }