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/export.h>
  28 #include <asm/unaligned.h>
  29
  30 #include <net/bluetooth/bluetooth.h>
  31 #include <net/bluetooth/hci_core.h>
  32 #include <net/bluetooth/hci_mon.h>
  33
  34 static atomic_t monitor_promisc = ATOMIC_INIT(0);
  35
  36 /* ----- HCI socket interface ----- */
  37
  38 static inline int hci_test_bit(int nr, void *addr)
  39 {
  40         return *((__u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));
  41 }
  42
  43 /* Security filter */
  44 static struct hci_sec_filter hci_sec_filter = {
  45         /* Packet types */
  46         0x10,
  47         /* Events */
  48         { 0x1000d9fe, 0x0000b00c },
  49         /* Commands */
  50         {
  51                 { 0x0 },
  52                 /* OGF_LINK_CTL */
  53                 { 0xbe000006, 0x00000001, 0x00000000, 0x00 },
  54                 /* OGF_LINK_POLICY */
  55                 { 0x00005200, 0x00000000, 0x00000000, 0x00 },
  56                 /* OGF_HOST_CTL */
  57                 { 0xaab00200, 0x2b402aaa, 0x05220154, 0x00 },
  58                 /* OGF_INFO_PARAM */
  59                 { 0x000002be, 0x00000000, 0x00000000, 0x00 },
  60                 /* OGF_STATUS_PARAM */
  61                 { 0x000000ea, 0x00000000, 0x00000000, 0x00 }
  62         }
  63 };
  64
  65 static struct bt_sock_list hci_sk_list = {
  66         .lock = __RW_LOCK_UNLOCKED(hci_sk_list.lock)
  67 };
  68
  69 static bool is_filtered_packet(struct sock *sk, struct sk_buff *skb)
  70 {
  71         struct hci_filter *flt;
  72         int flt_type, flt_event;
  73
  74         /* Apply filter */
  75         flt = &hci_pi(sk)->filter;
  76
  77         if (bt_cb(skb)->pkt_type == HCI_VENDOR_PKT)
  78                 flt_type = 0;
  79         else
  80                 flt_type = bt_cb(skb)->pkt_type & HCI_FLT_TYPE_BITS;
  81
  82         if (!test_bit(flt_type, &flt->type_mask))
  83                 return true;
  84
  85         /* Extra filter for event packets only */
  86         if (bt_cb(skb)->pkt_type != HCI_EVENT_PKT)
  87                 return false;
  88
  89         flt_event = (*(__u8 *)skb->data & HCI_FLT_EVENT_BITS);
  90
  91         if (!hci_test_bit(flt_event, &flt->event_mask))
  92                 return true;
  93
  94         /* Check filter only when opcode is set */
  95         if (!flt->opcode)
  96                 return false;
  97
  98         if (flt_event == HCI_EV_CMD_COMPLETE &&
  99             flt->opcode != get_unaligned((__le16 *)(skb->data + 3)))
 100                 return true;
 101
 102         if (flt_event == HCI_EV_CMD_STATUS &&
 103             flt->opcode != get_unaligned((__le16 *)(skb->data + 4)))
 104                 return true;
 105
 106         return false;
 107 }
 108
 109 /* Send frame to RAW socket */
 110 void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
 111 {
 112         struct sock *sk;
 113         struct sk_buff *skb_copy = NULL;
 114
 115         BT_DBG("hdev %p len %d", hdev, skb->len);
 116
 117         read_lock(&hci_sk_list.lock);
 118
 119         sk_for_each(sk, &hci_sk_list.head) {
 120                 struct sk_buff *nskb;
 121
 122                 if (sk->sk_state != BT_BOUND || hci_pi(sk)->hdev != hdev)
 123                         continue;
 124
 125                 /* Don't send frame to the socket it came from */
 126                 if (skb->sk == sk)
 127                         continue;
 128
 129                 if (hci_pi(sk)->channel == HCI_CHANNEL_RAW) {
 130                         if (is_filtered_packet(sk, skb))
 131                                 continue;
 132                 } else if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
 133                         if (!bt_cb(skb)->incoming)
 134                                 continue;
 135                         if (bt_cb(skb)->pkt_type != HCI_EVENT_PKT &&
 136                             bt_cb(skb)->pkt_type != HCI_ACLDATA_PKT &&
 137                             bt_cb(skb)->pkt_type != HCI_SCODATA_PKT)
 138                                 continue;
 139                 } else {
 140                         /* Don't send frame to other channel types */
 141                         continue;
 142                 }
 143
 144                 if (!skb_copy) {
 145                         /* Create a private copy with headroom */
 146                         skb_copy = __pskb_copy_fclone(skb, 1, GFP_ATOMIC, true);
 147                         if (!skb_copy)
 148                                 continue;
 149
 150                         /* Put type byte before the data */
 151                         memcpy(skb_push(skb_copy, 1), &bt_cb(skb)->pkt_type, 1);
 152                 }
 153
 154                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 155                 if (!nskb)
 156                         continue;
 157
 158                 if (sock_queue_rcv_skb(sk, nskb))
 159                         kfree_skb(nskb);
 160         }
 161
 162         read_unlock(&hci_sk_list.lock);
 163
 164         kfree_skb(skb_copy);
 165 }
 166
 167 /* Send frame to control socket */
 168 void hci_send_to_control(struct sk_buff *skb, struct sock *skip_sk)
 169 {
 170         struct sock *sk;
 171
 172         BT_DBG("len %d", skb->len);
 173
 174         read_lock(&hci_sk_list.lock);
 175
 176         sk_for_each(sk, &hci_sk_list.head) {
 177                 struct sk_buff *nskb;
 178
 179                 /* Skip the original socket */
 180                 if (sk == skip_sk)
 181                         continue;
 182
 183                 if (sk->sk_state != BT_BOUND)
 184                         continue;
 185
 186                 if (hci_pi(sk)->channel != HCI_CHANNEL_CONTROL)
 187                         continue;
 188
 189                 nskb = skb_clone(skb, GFP_ATOMIC);
 190                 if (!nskb)
 191                         continue;
 192
 193                 if (sock_queue_rcv_skb(sk, nskb))
 194                         kfree_skb(nskb);
 195         }
 196
 197         read_unlock(&hci_sk_list.lock);
 198 }
 199
 200 /* Send frame to monitor socket */
 201 void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
 202 {
 203         struct sock *sk;
 204         struct sk_buff *skb_copy = NULL;
 205         __le16 opcode;
 206
 207         if (!atomic_read(&monitor_promisc))
 208                 return;
 209
 210         BT_DBG("hdev %p len %d", hdev, skb->len);
 211
 212         switch (bt_cb(skb)->pkt_type) {
 213         case HCI_COMMAND_PKT:
 214                 opcode = cpu_to_le16(HCI_MON_COMMAND_PKT);
 215                 break;
 216         case HCI_EVENT_PKT:
 217                 opcode = cpu_to_le16(HCI_MON_EVENT_PKT);
 218                 break;
 219         case HCI_ACLDATA_PKT:
 220                 if (bt_cb(skb)->incoming)
 221                         opcode = cpu_to_le16(HCI_MON_ACL_RX_PKT);
 222                 else
 223                         opcode = cpu_to_le16(HCI_MON_ACL_TX_PKT);
 224                 break;
 225         case HCI_SCODATA_PKT:
 226                 if (bt_cb(skb)->incoming)
 227                         opcode = cpu_to_le16(HCI_MON_SCO_RX_PKT);
 228                 else
 229                         opcode = cpu_to_le16(HCI_MON_SCO_TX_PKT);
 230                 break;
 231         default:
 232                 return;
 233         }
 234
 235         read_lock(&hci_sk_list.lock);
 236
 237         sk_for_each(sk, &hci_sk_list.head) {
 238                 struct sk_buff *nskb;
 239
 240                 if (sk->sk_state != BT_BOUND)
 241                         continue;
 242
 243                 if (hci_pi(sk)->channel != HCI_CHANNEL_MONITOR)
 244                         continue;
 245
 246                 if (!skb_copy) {
 247                         struct hci_mon_hdr *hdr;
 248
 249                         /* Create a private copy with headroom */
 250                         skb_copy = __pskb_copy_fclone(skb, HCI_MON_HDR_SIZE,
 251                                                       GFP_ATOMIC, true);
 252                         if (!skb_copy)
 253                                 continue;
 254
 255                         /* Put header before the data */
 256                         hdr = (void *) skb_push(skb_copy, HCI_MON_HDR_SIZE);
 257                         hdr->opcode = opcode;
 258                         hdr->index = cpu_to_le16(hdev->id);
 259                         hdr->len = cpu_to_le16(skb->len);
 260                 }
 261
 262                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 263                 if (!nskb)
 264                         continue;
 265
 266                 if (sock_queue_rcv_skb(sk, nskb))
 267                         kfree_skb(nskb);
 268         }
 269
 270         read_unlock(&hci_sk_list.lock);
 271
 272         kfree_skb(skb_copy);
 273 }
 274
 275 static void send_monitor_event(struct sk_buff *skb)
 276 {
 277         struct sock *sk;
 278
 279         BT_DBG("len %d", skb->len);
 280
 281         read_lock(&hci_sk_list.lock);
 282
 283         sk_for_each(sk, &hci_sk_list.head) {
 284                 struct sk_buff *nskb;
 285
 286                 if (sk->sk_state != BT_BOUND)
 287                         continue;
 288
 289                 if (hci_pi(sk)->channel != HCI_CHANNEL_MONITOR)
 290                         continue;
 291
 292                 nskb = skb_clone(skb, GFP_ATOMIC);
 293                 if (!nskb)
 294                         continue;
 295
 296                 if (sock_queue_rcv_skb(sk, nskb))
 297                         kfree_skb(nskb);
 298         }
 299
 300         read_unlock(&hci_sk_list.lock);
 301 }
 302
 303 static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
 304 {
 305         struct hci_mon_hdr *hdr;
 306         struct hci_mon_new_index *ni;
 307         struct sk_buff *skb;
 308         __le16 opcode;
 309
 310         switch (event) {
 311         case HCI_DEV_REG:
 312                 skb = bt_skb_alloc(HCI_MON_NEW_INDEX_SIZE, GFP_ATOMIC);
 313                 if (!skb)
 314                         return NULL;
 315
 316                 ni = (void *) skb_put(skb, HCI_MON_NEW_INDEX_SIZE);
 317                 ni->type = hdev->dev_type;
 318                 ni->bus = hdev->bus;
 319                 bacpy(&ni->bdaddr, &hdev->bdaddr);
 320                 memcpy(ni->name, hdev->name, 8);
 321
 322                 opcode = cpu_to_le16(HCI_MON_NEW_INDEX);
 323                 break;
 324
 325         case HCI_DEV_UNREG:
 326                 skb = bt_skb_alloc(0, GFP_ATOMIC);
 327                 if (!skb)
 328                         return NULL;
 329
 330                 opcode = cpu_to_le16(HCI_MON_DEL_INDEX);
 331                 break;
 332
 333         default:
 334                 return NULL;
 335         }
 336
 337         __net_timestamp(skb);
 338
 339         hdr = (void *) skb_push(skb, HCI_MON_HDR_SIZE);
 340         hdr->opcode = opcode;
 341         hdr->index = cpu_to_le16(hdev->id);
 342         hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
 343
 344         return skb;
 345 }
 346
 347 static void send_monitor_replay(struct sock *sk)
 348 {
 349         struct hci_dev *hdev;
 350
 351         read_lock(&hci_dev_list_lock);
 352
 353         list_for_each_entry(hdev, &hci_dev_list, list) {
 354                 struct sk_buff *skb;
 355
 356                 skb = create_monitor_event(hdev, HCI_DEV_REG);
 357                 if (!skb)
 358                         continue;
 359
 360                 if (sock_queue_rcv_skb(sk, skb))
 361                         kfree_skb(skb);
 362         }
 363
 364         read_unlock(&hci_dev_list_lock);
 365 }
 366
 367 /* Generate internal stack event */
 368 static void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data)
 369 {
 370         struct hci_event_hdr *hdr;
 371         struct hci_ev_stack_internal *ev;
 372         struct sk_buff *skb;
 373
 374         skb = bt_skb_alloc(HCI_EVENT_HDR_SIZE + sizeof(*ev) + dlen, GFP_ATOMIC);
 375         if (!skb)
 376                 return;
 377
 378         hdr = (void *) skb_put(skb, HCI_EVENT_HDR_SIZE);
 379         hdr->evt  = HCI_EV_STACK_INTERNAL;
 380         hdr->plen = sizeof(*ev) + dlen;
 381
 382         ev  = (void *) skb_put(skb, sizeof(*ev) + dlen);
 383         ev->type = type;
 384         memcpy(ev->data, data, dlen);
 385
 386         bt_cb(skb)->incoming = 1;
 387         __net_timestamp(skb);
 388
 389         bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
 390         hci_send_to_sock(hdev, skb);
 391         kfree_skb(skb);
 392 }
 393
 394 void hci_sock_dev_event(struct hci_dev *hdev, int event)
 395 {
 396         struct hci_ev_si_device ev;
 397
 398         BT_DBG("hdev %s event %d", hdev->name, event);
 399
 400         /* Send event to monitor */
 401         if (atomic_read(&monitor_promisc)) {
 402                 struct sk_buff *skb;
 403
 404                 skb = create_monitor_event(hdev, event);
 405                 if (skb) {
 406                         send_monitor_event(skb);
 407                         kfree_skb(skb);
 408                 }
 409         }
 410
 411         /* Send event to sockets */
 412         ev.event  = event;
 413         ev.dev_id = hdev->id;
 414         hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);
 415
 416         if (event == HCI_DEV_UNREG) {
 417                 struct sock *sk;
 418
 419                 /* Detach sockets from device */
 420                 read_lock(&hci_sk_list.lock);
 421                 sk_for_each(sk, &hci_sk_list.head) {
 422                         bh_lock_sock_nested(sk);
 423                         if (hci_pi(sk)->hdev == hdev) {
 424                                 hci_pi(sk)->hdev = NULL;
 425                                 sk->sk_err = EPIPE;
 426                                 sk->sk_state = BT_OPEN;
 427                                 sk->sk_state_change(sk);
 428
 429                                 hci_dev_put(hdev);
 430                         }
 431                         bh_unlock_sock(sk);
 432                 }
 433                 read_unlock(&hci_sk_list.lock);
 434         }
 435 }
 436
 437 static int hci_sock_release(struct socket *sock)
 438 {
 439         struct sock *sk = sock->sk;
 440         struct hci_dev *hdev;
 441
 442         BT_DBG("sock %p sk %p", sock, sk);
 443
 444         if (!sk)
 445                 return 0;
 446
 447         hdev = hci_pi(sk)->hdev;
 448
 449         if (hci_pi(sk)->channel == HCI_CHANNEL_MONITOR)
 450                 atomic_dec(&monitor_promisc);
 451
 452         bt_sock_unlink(&hci_sk_list, sk);
 453
 454         if (hdev) {
 455                 if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
 456                         mgmt_index_added(hdev);
 457                         clear_bit(HCI_USER_CHANNEL, &hdev->dev_flags);
 458                         hci_dev_close(hdev->id);
 459                 }
 460
 461                 atomic_dec(&hdev->promisc);
 462                 hci_dev_put(hdev);
 463         }
 464
 465         sock_orphan(sk);
 466
 467         skb_queue_purge(&sk->sk_receive_queue);
 468         skb_queue_purge(&sk->sk_write_queue);
 469
 470         sock_put(sk);
 471         return 0;
 472 }
 473
 474 static int hci_sock_blacklist_add(struct hci_dev *hdev, void __user *arg)
 475 {
 476         bdaddr_t bdaddr;
 477         int err;
 478
 479         if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
 480                 return -EFAULT;
 481
 482         hci_dev_lock(hdev);
 483
 484         err = hci_bdaddr_list_add(&hdev->blacklist, &bdaddr, BDADDR_BREDR);
 485
 486         hci_dev_unlock(hdev);
 487
 488         return err;
 489 }
 490
 491 static int hci_sock_blacklist_del(struct hci_dev *hdev, void __user *arg)
 492 {
 493         bdaddr_t bdaddr;
 494         int err;
 495
 496         if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
 497                 return -EFAULT;
 498
 499         hci_dev_lock(hdev);
 500
 501         err = hci_bdaddr_list_del(&hdev->blacklist, &bdaddr, BDADDR_BREDR);
 502
 503         hci_dev_unlock(hdev);
 504
 505         return err;
 506 }
 507
 508 /* Ioctls that require bound socket */
 509 static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd,
 510                                 unsigned long arg)
 511 {
 512         struct hci_dev *hdev = hci_pi(sk)->hdev;
 513
 514         if (!hdev)
 515                 return -EBADFD;
 516
 517         if (test_bit(HCI_USER_CHANNEL, &hdev->dev_flags))
 518                 return -EBUSY;
 519
 520         if (test_bit(HCI_UNCONFIGURED, &hdev->dev_flags))
 521                 return -EOPNOTSUPP;
 522
 523         if (hdev->dev_type != HCI_BREDR)
 524                 return -EOPNOTSUPP;
 525
 526         switch (cmd) {
 527         case HCISETRAW:
 528                 if (!capable(CAP_NET_ADMIN))
 529                         return -EPERM;
 530                 return -EOPNOTSUPP;
 531
 532         case HCIGETCONNINFO:
 533                 return hci_get_conn_info(hdev, (void __user *) arg);
 534
 535         case HCIGETAUTHINFO:
 536                 return hci_get_auth_info(hdev, (void __user *) arg);
 537
 538         case HCIBLOCKADDR:
 539                 if (!capable(CAP_NET_ADMIN))
 540                         return -EPERM;
 541                 return hci_sock_blacklist_add(hdev, (void __user *) arg);
 542
 543         case HCIUNBLOCKADDR:
 544                 if (!capable(CAP_NET_ADMIN))
 545                         return -EPERM;
 546                 return hci_sock_blacklist_del(hdev, (void __user *) arg);
 547         }
 548
 549         return -ENOIOCTLCMD;
 550 }
 551
 552 static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
 553                           unsigned long arg)
 554 {
 555         void __user *argp = (void __user *) arg;
 556         struct sock *sk = sock->sk;
 557         int err;
 558
 559         BT_DBG("cmd %x arg %lx", cmd, arg);
 560
 561         lock_sock(sk);
 562
 563         if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
 564                 err = -EBADFD;
 565                 goto done;
 566         }
 567
 568         release_sock(sk);
 569
 570         switch (cmd) {
 571         case HCIGETDEVLIST:
 572                 return hci_get_dev_list(argp);
 573
 574         case HCIGETDEVINFO:
 575                 return hci_get_dev_info(argp);
 576
 577         case HCIGETCONNLIST:
 578                 return hci_get_conn_list(argp);
 579
 580         case HCIDEVUP:
 581                 if (!capable(CAP_NET_ADMIN))
 582                         return -EPERM;
 583                 return hci_dev_open(arg);
 584
 585         case HCIDEVDOWN:
 586                 if (!capable(CAP_NET_ADMIN))
 587                         return -EPERM;
 588                 return hci_dev_close(arg);
 589
 590         case HCIDEVRESET:
 591                 if (!capable(CAP_NET_ADMIN))
 592                         return -EPERM;
 593                 return hci_dev_reset(arg);
 594
 595         case HCIDEVRESTAT:
 596                 if (!capable(CAP_NET_ADMIN))
 597                         return -EPERM;
 598                 return hci_dev_reset_stat(arg);
 599
 600         case HCISETSCAN:
 601         case HCISETAUTH:
 602         case HCISETENCRYPT:
 603         case HCISETPTYPE:
 604         case HCISETLINKPOL:
 605         case HCISETLINKMODE:
 606         case HCISETACLMTU:
 607         case HCISETSCOMTU:
 608                 if (!capable(CAP_NET_ADMIN))
 609                         return -EPERM;
 610                 return hci_dev_cmd(cmd, argp);
 611
 612         case HCIINQUIRY:
 613                 return hci_inquiry(argp);
 614         }
 615
 616         lock_sock(sk);
 617
 618         err = hci_sock_bound_ioctl(sk, cmd, arg);
 619
 620 done:
 621         release_sock(sk);
 622         return err;
 623 }
 624
 625 static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
 626                          int addr_len)
 627 {
 628         struct sockaddr_hci haddr;
 629         struct sock *sk = sock->sk;
 630         struct hci_dev *hdev = NULL;
 631         int len, err = 0;
 632
 633         BT_DBG("sock %p sk %p", sock, sk);
 634
 635         if (!addr)
 636                 return -EINVAL;
 637
 638         memset(&haddr, 0, sizeof(haddr));
 639         len = min_t(unsigned int, sizeof(haddr), addr_len);
 640         memcpy(&haddr, addr, len);
 641
 642         if (haddr.hci_family != AF_BLUETOOTH)
 643                 return -EINVAL;
 644
 645         lock_sock(sk);
 646
 647         if (sk->sk_state == BT_BOUND) {
 648                 err = -EALREADY;
 649                 goto done;
 650         }
 651
 652         switch (haddr.hci_channel) {
 653         case HCI_CHANNEL_RAW:
 654                 if (hci_pi(sk)->hdev) {
 655                         err = -EALREADY;
 656                         goto done;
 657                 }
 658
 659                 if (haddr.hci_dev != HCI_DEV_NONE) {
 660                         hdev = hci_dev_get(haddr.hci_dev);
 661                         if (!hdev) {
 662                                 err = -ENODEV;
 663                                 goto done;
 664                         }
 665
 666                         atomic_inc(&hdev->promisc);
 667                 }
 668
 669                 hci_pi(sk)->hdev = hdev;
 670                 break;
 671
 672         case HCI_CHANNEL_USER:
 673                 if (hci_pi(sk)->hdev) {
 674                         err = -EALREADY;
 675                         goto done;
 676                 }
 677
 678                 if (haddr.hci_dev == HCI_DEV_NONE) {
 679                         err = -EINVAL;
 680                         goto done;
 681                 }
 682
 683                 if (!capable(CAP_NET_ADMIN)) {
 684                         err = -EPERM;
 685                         goto done;
 686                 }
 687
 688                 hdev = hci_dev_get(haddr.hci_dev);
 689                 if (!hdev) {
 690                         err = -ENODEV;
 691                         goto done;
 692                 }
 693
 694                 if (test_bit(HCI_UP, &hdev->flags) ||
 695                     test_bit(HCI_INIT, &hdev->flags) ||
 696                     test_bit(HCI_SETUP, &hdev->dev_flags) ||
 697                     test_bit(HCI_CONFIG, &hdev->dev_flags)) {
 698                         err = -EBUSY;
 699                         hci_dev_put(hdev);
 700                         goto done;
 701                 }
 702
 703                 if (test_and_set_bit(HCI_USER_CHANNEL, &hdev->dev_flags)) {
 704                         err = -EUSERS;
 705                         hci_dev_put(hdev);
 706                         goto done;
 707                 }
 708
 709                 mgmt_index_removed(hdev);
 710
 711                 err = hci_dev_open(hdev->id);
 712                 if (err) {
 713                         clear_bit(HCI_USER_CHANNEL, &hdev->dev_flags);
 714                         mgmt_index_added(hdev);
 715                         hci_dev_put(hdev);
 716                         goto done;
 717                 }
 718
 719                 atomic_inc(&hdev->promisc);
 720
 721                 hci_pi(sk)->hdev = hdev;
 722                 break;
 723
 724         case HCI_CHANNEL_CONTROL:
 725                 if (haddr.hci_dev != HCI_DEV_NONE) {
 726                         err = -EINVAL;
 727                         goto done;
 728                 }
 729
 730                 if (!capable(CAP_NET_ADMIN)) {
 731                         err = -EPERM;
 732                         goto done;
 733                 }
 734
 735                 break;
 736
 737         case HCI_CHANNEL_MONITOR:
 738                 if (haddr.hci_dev != HCI_DEV_NONE) {
 739                         err = -EINVAL;
 740                         goto done;
 741                 }
 742
 743                 if (!capable(CAP_NET_RAW)) {
 744                         err = -EPERM;
 745                         goto done;
 746                 }
 747
 748                 send_monitor_replay(sk);
 749
 750                 atomic_inc(&monitor_promisc);
 751                 break;
 752
 753         default:
 754                 err = -EINVAL;
 755                 goto done;
 756         }
 757
 758
 759         hci_pi(sk)->channel = haddr.hci_channel;
 760         sk->sk_state = BT_BOUND;
 761
 762 done:
 763         release_sock(sk);
 764         return err;
 765 }
 766
 767 static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
 768                             int *addr_len, int peer)
 769 {
 770         struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
 771         struct sock *sk = sock->sk;
 772         struct hci_dev *hdev;
 773         int err = 0;
 774
 775         BT_DBG("sock %p sk %p", sock, sk);
 776
 777         if (peer)
 778                 return -EOPNOTSUPP;
 779
 780         lock_sock(sk);
 781
 782         hdev = hci_pi(sk)->hdev;
 783         if (!hdev) {
 784                 err = -EBADFD;
 785                 goto done;
 786         }
 787
 788         *addr_len = sizeof(*haddr);
 789         haddr->hci_family = AF_BLUETOOTH;
 790         haddr->hci_dev    = hdev->id;
 791         haddr->hci_channel= hci_pi(sk)->channel;
 792
 793 done:
 794         release_sock(sk);
 795         return err;
 796 }
 797
 798 static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
 799                           struct sk_buff *skb)
 800 {
 801         __u32 mask = hci_pi(sk)->cmsg_mask;
 802
 803         if (mask & HCI_CMSG_DIR) {
 804                 int incoming = bt_cb(skb)->incoming;
 805                 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
 806                          &incoming);
 807         }
 808
 809         if (mask & HCI_CMSG_TSTAMP) {
 810 #ifdef CONFIG_COMPAT
 811                 struct compat_timeval ctv;
 812 #endif
 813                 struct timeval tv;
 814                 void *data;
 815                 int len;
 816
 817                 skb_get_timestamp(skb, &tv);
 818
 819                 data = &tv;
 820                 len = sizeof(tv);
 821 #ifdef CONFIG_COMPAT
 822                 if (!COMPAT_USE_64BIT_TIME &&
 823                     (msg->msg_flags & MSG_CMSG_COMPAT)) {
 824                         ctv.tv_sec = tv.tv_sec;
 825                         ctv.tv_usec = tv.tv_usec;
 826                         data = &ctv;
 827                         len = sizeof(ctv);
 828                 }
 829 #endif
 830
 831                 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
 832         }
 833 }
 834
 835 static int hci_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 836                             struct msghdr *msg, size_t len, int flags)
 837 {
 838         int noblock = flags & MSG_DONTWAIT;
 839         struct sock *sk = sock->sk;
 840         struct sk_buff *skb;
 841         int copied, err;
 842
 843         BT_DBG("sock %p, sk %p", sock, sk);
 844
 845         if (flags & (MSG_OOB))
 846                 return -EOPNOTSUPP;
 847
 848         if (sk->sk_state == BT_CLOSED)
 849                 return 0;
 850
 851         skb = skb_recv_datagram(sk, flags, noblock, &err);
 852         if (!skb)
 853                 return err;
 854
 855         copied = skb->len;
 856         if (len < copied) {
 857                 msg->msg_flags |= MSG_TRUNC;
 858                 copied = len;
 859         }
 860
 861         skb_reset_transport_header(skb);
 862         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 863
 864         switch (hci_pi(sk)->channel) {
 865         case HCI_CHANNEL_RAW:
 866                 hci_sock_cmsg(sk, msg, skb);
 867                 break;
 868         case HCI_CHANNEL_USER:
 869         case HCI_CHANNEL_CONTROL:
 870         case HCI_CHANNEL_MONITOR:
 871                 sock_recv_timestamp(msg, sk, skb);
 872                 break;
 873         }
 874
 875         skb_free_datagram(sk, skb);
 876
 877         return err ? : copied;
 878 }
 879
 880 static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 881                             struct msghdr *msg, size_t len)
 882 {
 883         struct sock *sk = sock->sk;
 884         struct hci_dev *hdev;
 885         struct sk_buff *skb;
 886         int err;
 887
 888         BT_DBG("sock %p sk %p", sock, sk);
 889
 890         if (msg->msg_flags & MSG_OOB)
 891                 return -EOPNOTSUPP;
 892
 893         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
 894                 return -EINVAL;
 895
 896         if (len < 4 || len > HCI_MAX_FRAME_SIZE)
 897                 return -EINVAL;
 898
 899         lock_sock(sk);
 900
 901         switch (hci_pi(sk)->channel) {
 902         case HCI_CHANNEL_RAW:
 903         case HCI_CHANNEL_USER:
 904                 break;
 905         case HCI_CHANNEL_CONTROL:
 906                 err = mgmt_control(sk, msg, len);
 907                 goto done;
 908         case HCI_CHANNEL_MONITOR:
 909                 err = -EOPNOTSUPP;
 910                 goto done;
 911         default:
 912                 err = -EINVAL;
 913                 goto done;
 914         }
 915
 916         hdev = hci_pi(sk)->hdev;
 917         if (!hdev) {
 918                 err = -EBADFD;
 919                 goto done;
 920         }
 921
 922         if (!test_bit(HCI_UP, &hdev->flags)) {
 923                 err = -ENETDOWN;
 924                 goto done;
 925         }
 926
 927         skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
 928         if (!skb)
 929                 goto done;
 930
 931         if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
 932                 err = -EFAULT;
 933                 goto drop;
 934         }
 935
 936         bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
 937         skb_pull(skb, 1);
 938
 939         if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
 940                 /* No permission check is needed for user channel
 941                  * since that gets enforced when binding the socket.
 942                  *
 943                  * However check that the packet type is valid.
 944                  */
 945                 if (bt_cb(skb)->pkt_type != HCI_COMMAND_PKT &&
 946                     bt_cb(skb)->pkt_type != HCI_ACLDATA_PKT &&
 947                     bt_cb(skb)->pkt_type != HCI_SCODATA_PKT) {
 948                         err = -EINVAL;
 949                         goto drop;
 950                 }
 951
 952                 skb_queue_tail(&hdev->raw_q, skb);
 953                 queue_work(hdev->workqueue, &hdev->tx_work);
 954         } else if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
 955                 u16 opcode = get_unaligned_le16(skb->data);
 956                 u16 ogf = hci_opcode_ogf(opcode);
 957                 u16 ocf = hci_opcode_ocf(opcode);
 958
 959                 if (((ogf > HCI_SFLT_MAX_OGF) ||
 960                      !hci_test_bit(ocf & HCI_FLT_OCF_BITS,
 961                                    &hci_sec_filter.ocf_mask[ogf])) &&
 962                     !capable(CAP_NET_RAW)) {
 963                         err = -EPERM;
 964                         goto drop;
 965                 }
 966
 967                 if (ogf == 0x3f) {
 968                         skb_queue_tail(&hdev->raw_q, skb);
 969                         queue_work(hdev->workqueue, &hdev->tx_work);
 970                 } else {
 971                         /* Stand-alone HCI commands must be flaged as
 972                          * single-command requests.
 973                          */
 974                         bt_cb(skb)->req.start = true;
 975
 976                         skb_queue_tail(&hdev->cmd_q, skb);
 977                         queue_work(hdev->workqueue, &hdev->cmd_work);
 978                 }
 979         } else {
 980                 if (!capable(CAP_NET_RAW)) {
 981                         err = -EPERM;
 982                         goto drop;
 983                 }
 984
 985                 skb_queue_tail(&hdev->raw_q, skb);
 986                 queue_work(hdev->workqueue, &hdev->tx_work);
 987         }
 988
 989         err = len;
 990
 991 done:
 992         release_sock(sk);
 993         return err;
 994
 995 drop:
 996         kfree_skb(skb);
 997         goto done;
 998 }
 999
1000 static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
1001                                char __user *optval, unsigned int len)
1002 {
1003         struct hci_ufilter uf = { .opcode = 0 };
1004         struct sock *sk = sock->sk;
1005         int err = 0, opt = 0;
1006
1007         BT_DBG("sk %p, opt %d", sk, optname);
1008
1009         lock_sock(sk);
1010
1011         if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1012                 err = -EBADFD;
1013                 goto done;
1014         }
1015
1016         switch (optname) {
1017         case HCI_DATA_DIR:
1018                 if (get_user(opt, (int __user *)optval)) {
1019                         err = -EFAULT;
1020                         break;
1021                 }
1022
1023                 if (opt)
1024                         hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
1025                 else
1026                         hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
1027                 break;
1028
1029         case HCI_TIME_STAMP:
1030                 if (get_user(opt, (int __user *)optval)) {
1031                         err = -EFAULT;
1032                         break;
1033                 }
1034
1035                 if (opt)
1036                         hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
1037                 else
1038                         hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
1039                 break;
1040
1041         case HCI_FILTER:
1042                 {
1043                         struct hci_filter *f = &hci_pi(sk)->filter;
1044
1045                         uf.type_mask = f->type_mask;
1046                         uf.opcode    = f->opcode;
1047                         uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1048                         uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1049                 }
1050
1051                 len = min_t(unsigned int, len, sizeof(uf));
1052                 if (copy_from_user(&uf, optval, len)) {
1053                         err = -EFAULT;
1054                         break;
1055                 }
1056
1057                 if (!capable(CAP_NET_RAW)) {
1058                         uf.type_mask &= hci_sec_filter.type_mask;
1059                         uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
1060                         uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
1061                 }
1062
1063                 {
1064                         struct hci_filter *f = &hci_pi(sk)->filter;
1065
1066                         f->type_mask = uf.type_mask;
1067                         f->opcode    = uf.opcode;
1068                         *((u32 *) f->event_mask + 0) = uf.event_mask[0];
1069                         *((u32 *) f->event_mask + 1) = uf.event_mask[1];
1070                 }
1071                 break;
1072
1073         default:
1074                 err = -ENOPROTOOPT;
1075                 break;
1076         }
1077
1078 done:
1079         release_sock(sk);
1080         return err;
1081 }
1082
1083 static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
1084                                char __user *optval, int __user *optlen)
1085 {
1086         struct hci_ufilter uf;
1087         struct sock *sk = sock->sk;
1088         int len, opt, err = 0;
1089
1090         BT_DBG("sk %p, opt %d", sk, optname);
1091
1092         if (get_user(len, optlen))
1093                 return -EFAULT;
1094
1095         lock_sock(sk);
1096
1097         if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1098                 err = -EBADFD;
1099                 goto done;
1100         }
1101
1102         switch (optname) {
1103         case HCI_DATA_DIR:
1104                 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
1105                         opt = 1;
1106                 else
1107                         opt = 0;
1108
1109                 if (put_user(opt, optval))
1110                         err = -EFAULT;
1111                 break;
1112
1113         case HCI_TIME_STAMP:
1114                 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
1115                         opt = 1;
1116                 else
1117                         opt = 0;
1118
1119                 if (put_user(opt, optval))
1120                         err = -EFAULT;
1121                 break;
1122
1123         case HCI_FILTER:
1124                 {
1125                         struct hci_filter *f = &hci_pi(sk)->filter;
1126
1127                         memset(&uf, 0, sizeof(uf));
1128                         uf.type_mask = f->type_mask;
1129                         uf.opcode    = f->opcode;
1130                         uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1131                         uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1132                 }
1133
1134                 len = min_t(unsigned int, len, sizeof(uf));
1135                 if (copy_to_user(optval, &uf, len))
1136                         err = -EFAULT;
1137                 break;
1138
1139         default:
1140                 err = -ENOPROTOOPT;
1141                 break;
1142         }
1143
1144 done:
1145         release_sock(sk);
1146         return err;
1147 }
1148
1149 static const struct proto_ops hci_sock_ops = {
1150         .family         = PF_BLUETOOTH,
1151         .owner          = THIS_MODULE,
1152         .release        = hci_sock_release,
1153         .bind           = hci_sock_bind,
1154         .getname        = hci_sock_getname,
1155         .sendmsg        = hci_sock_sendmsg,
1156         .recvmsg        = hci_sock_recvmsg,
1157         .ioctl          = hci_sock_ioctl,
1158         .poll           = datagram_poll,
1159         .listen         = sock_no_listen,
1160         .shutdown       = sock_no_shutdown,
1161         .setsockopt     = hci_sock_setsockopt,
1162         .getsockopt     = hci_sock_getsockopt,
1163         .connect        = sock_no_connect,
1164         .socketpair     = sock_no_socketpair,
1165         .accept         = sock_no_accept,
1166         .mmap           = sock_no_mmap
1167 };
1168
1169 static struct proto hci_sk_proto = {
1170         .name           = "HCI",
1171         .owner          = THIS_MODULE,
1172         .obj_size       = sizeof(struct hci_pinfo)
1173 };
1174
1175 static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
1176                            int kern)
1177 {
1178         struct sock *sk;
1179
1180         BT_DBG("sock %p", sock);
1181
1182         if (sock->type != SOCK_RAW)
1183                 return -ESOCKTNOSUPPORT;
1184
1185         sock->ops = &hci_sock_ops;
1186
1187         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto);
1188         if (!sk)
1189                 return -ENOMEM;
1190
1191         sock_init_data(sock, sk);
1192
1193         sock_reset_flag(sk, SOCK_ZAPPED);
1194
1195         sk->sk_protocol = protocol;
1196
1197         sock->state = SS_UNCONNECTED;
1198         sk->sk_state = BT_OPEN;
1199
1200         bt_sock_link(&hci_sk_list, sk);
1201         return 0;
1202 }
1203
1204 static const struct net_proto_family hci_sock_family_ops = {
1205         .family = PF_BLUETOOTH,
1206         .owner  = THIS_MODULE,
1207         .create = hci_sock_create,
1208 };
1209
1210 int __init hci_sock_init(void)
1211 {
1212         int err;
1213
1214         err = proto_register(&hci_sk_proto, 0);
1215         if (err < 0)
1216                 return err;
1217
1218         err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
1219         if (err < 0) {
1220                 BT_ERR("HCI socket registration failed");
1221                 goto error;
1222         }
1223
1224         err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
1225         if (err < 0) {
1226                 BT_ERR("Failed to create HCI proc file");
1227                 bt_sock_unregister(BTPROTO_HCI);
1228                 goto error;
1229         }
1230
1231         BT_INFO("HCI socket layer initialized");
1232
1233         return 0;
1234
1235 error:
1236         proto_unregister(&hci_sk_proto);
1237         return err;
1238 }
1239
1240 void hci_sock_cleanup(void)
1241 {
1242         bt_procfs_cleanup(&init_net, "hci");
1243         bt_sock_unregister(BTPROTO_HCI);
1244         proto_unregister(&hci_sk_proto);
1245 }