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(skb, 1, GFP_ATOMIC);
 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(skb, HCI_MON_HDR_SIZE,
 251                                                GFP_ATOMIC);
 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_blacklist_add(hdev, &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_blacklist_del(hdev, &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 (hdev->dev_type != HCI_BREDR)
 521                 return -EOPNOTSUPP;
 522
 523         switch (cmd) {
 524         case HCISETRAW:
 525                 if (!capable(CAP_NET_ADMIN))
 526                         return -EPERM;
 527
 528                 if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
 529                         return -EPERM;
 530
 531                 if (arg)
 532                         set_bit(HCI_RAW, &hdev->flags);
 533                 else
 534                         clear_bit(HCI_RAW, &hdev->flags);
 535
 536                 return 0;
 537
 538         case HCIGETCONNINFO:
 539                 return hci_get_conn_info(hdev, (void __user *) arg);
 540
 541         case HCIGETAUTHINFO:
 542                 return hci_get_auth_info(hdev, (void __user *) arg);
 543
 544         case HCIBLOCKADDR:
 545                 if (!capable(CAP_NET_ADMIN))
 546                         return -EPERM;
 547                 return hci_sock_blacklist_add(hdev, (void __user *) arg);
 548
 549         case HCIUNBLOCKADDR:
 550                 if (!capable(CAP_NET_ADMIN))
 551                         return -EPERM;
 552                 return hci_sock_blacklist_del(hdev, (void __user *) arg);
 553         }
 554
 555         return -ENOIOCTLCMD;
 556 }
 557
 558 static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
 559                           unsigned long arg)
 560 {
 561         void __user *argp = (void __user *) arg;
 562         struct sock *sk = sock->sk;
 563         int err;
 564
 565         BT_DBG("cmd %x arg %lx", cmd, arg);
 566
 567         lock_sock(sk);
 568
 569         if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
 570                 err = -EBADFD;
 571                 goto done;
 572         }
 573
 574         release_sock(sk);
 575
 576         switch (cmd) {
 577         case HCIGETDEVLIST:
 578                 return hci_get_dev_list(argp);
 579
 580         case HCIGETDEVINFO:
 581                 return hci_get_dev_info(argp);
 582
 583         case HCIGETCONNLIST:
 584                 return hci_get_conn_list(argp);
 585
 586         case HCIDEVUP:
 587                 if (!capable(CAP_NET_ADMIN))
 588                         return -EPERM;
 589                 return hci_dev_open(arg);
 590
 591         case HCIDEVDOWN:
 592                 if (!capable(CAP_NET_ADMIN))
 593                         return -EPERM;
 594                 return hci_dev_close(arg);
 595
 596         case HCIDEVRESET:
 597                 if (!capable(CAP_NET_ADMIN))
 598                         return -EPERM;
 599                 return hci_dev_reset(arg);
 600
 601         case HCIDEVRESTAT:
 602                 if (!capable(CAP_NET_ADMIN))
 603                         return -EPERM;
 604                 return hci_dev_reset_stat(arg);
 605
 606         case HCISETSCAN:
 607         case HCISETAUTH:
 608         case HCISETENCRYPT:
 609         case HCISETPTYPE:
 610         case HCISETLINKPOL:
 611         case HCISETLINKMODE:
 612         case HCISETACLMTU:
 613         case HCISETSCOMTU:
 614                 if (!capable(CAP_NET_ADMIN))
 615                         return -EPERM;
 616                 return hci_dev_cmd(cmd, argp);
 617
 618         case HCIINQUIRY:
 619                 return hci_inquiry(argp);
 620         }
 621
 622         lock_sock(sk);
 623
 624         err = hci_sock_bound_ioctl(sk, cmd, arg);
 625
 626 done:
 627         release_sock(sk);
 628         return err;
 629 }
 630
 631 static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
 632                          int addr_len)
 633 {
 634         struct sockaddr_hci haddr;
 635         struct sock *sk = sock->sk;
 636         struct hci_dev *hdev = NULL;
 637         int len, err = 0;
 638
 639         BT_DBG("sock %p sk %p", sock, sk);
 640
 641         if (!addr)
 642                 return -EINVAL;
 643
 644         memset(&haddr, 0, sizeof(haddr));
 645         len = min_t(unsigned int, sizeof(haddr), addr_len);
 646         memcpy(&haddr, addr, len);
 647
 648         if (haddr.hci_family != AF_BLUETOOTH)
 649                 return -EINVAL;
 650
 651         lock_sock(sk);
 652
 653         if (sk->sk_state == BT_BOUND) {
 654                 err = -EALREADY;
 655                 goto done;
 656         }
 657
 658         switch (haddr.hci_channel) {
 659         case HCI_CHANNEL_RAW:
 660                 if (hci_pi(sk)->hdev) {
 661                         err = -EALREADY;
 662                         goto done;
 663                 }
 664
 665                 if (haddr.hci_dev != HCI_DEV_NONE) {
 666                         hdev = hci_dev_get(haddr.hci_dev);
 667                         if (!hdev) {
 668                                 err = -ENODEV;
 669                                 goto done;
 670                         }
 671
 672                         atomic_inc(&hdev->promisc);
 673                 }
 674
 675                 hci_pi(sk)->hdev = hdev;
 676                 break;
 677
 678         case HCI_CHANNEL_USER:
 679                 if (hci_pi(sk)->hdev) {
 680                         err = -EALREADY;
 681                         goto done;
 682                 }
 683
 684                 if (haddr.hci_dev == HCI_DEV_NONE) {
 685                         err = -EINVAL;
 686                         goto done;
 687                 }
 688
 689                 if (!capable(CAP_NET_ADMIN)) {
 690                         err = -EPERM;
 691                         goto done;
 692                 }
 693
 694                 hdev = hci_dev_get(haddr.hci_dev);
 695                 if (!hdev) {
 696                         err = -ENODEV;
 697                         goto done;
 698                 }
 699
 700                 if (test_bit(HCI_UP, &hdev->flags) ||
 701                     test_bit(HCI_INIT, &hdev->flags) ||
 702                     test_bit(HCI_SETUP, &hdev->dev_flags)) {
 703                         err = -EBUSY;
 704                         hci_dev_put(hdev);
 705                         goto done;
 706                 }
 707
 708                 if (test_and_set_bit(HCI_USER_CHANNEL, &hdev->dev_flags)) {
 709                         err = -EUSERS;
 710                         hci_dev_put(hdev);
 711                         goto done;
 712                 }
 713
 714                 mgmt_index_removed(hdev);
 715
 716                 err = hci_dev_open(hdev->id);
 717                 if (err) {
 718                         clear_bit(HCI_USER_CHANNEL, &hdev->dev_flags);
 719                         mgmt_index_added(hdev);
 720                         hci_dev_put(hdev);
 721                         goto done;
 722                 }
 723
 724                 atomic_inc(&hdev->promisc);
 725
 726                 hci_pi(sk)->hdev = hdev;
 727                 break;
 728
 729         case HCI_CHANNEL_CONTROL:
 730                 if (haddr.hci_dev != HCI_DEV_NONE) {
 731                         err = -EINVAL;
 732                         goto done;
 733                 }
 734
 735                 if (!capable(CAP_NET_ADMIN)) {
 736                         err = -EPERM;
 737                         goto done;
 738                 }
 739
 740                 break;
 741
 742         case HCI_CHANNEL_MONITOR:
 743                 if (haddr.hci_dev != HCI_DEV_NONE) {
 744                         err = -EINVAL;
 745                         goto done;
 746                 }
 747
 748                 if (!capable(CAP_NET_RAW)) {
 749                         err = -EPERM;
 750                         goto done;
 751                 }
 752
 753                 send_monitor_replay(sk);
 754
 755                 atomic_inc(&monitor_promisc);
 756                 break;
 757
 758         default:
 759                 err = -EINVAL;
 760                 goto done;
 761         }
 762
 763
 764         hci_pi(sk)->channel = haddr.hci_channel;
 765         sk->sk_state = BT_BOUND;
 766
 767 done:
 768         release_sock(sk);
 769         return err;
 770 }
 771
 772 static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
 773                             int *addr_len, int peer)
 774 {
 775         struct sockaddr_hci *haddr = (struct sockaddr_hci *) addr;
 776         struct sock *sk = sock->sk;
 777         struct hci_dev *hdev;
 778         int err = 0;
 779
 780         BT_DBG("sock %p sk %p", sock, sk);
 781
 782         if (peer)
 783                 return -EOPNOTSUPP;
 784
 785         lock_sock(sk);
 786
 787         hdev = hci_pi(sk)->hdev;
 788         if (!hdev) {
 789                 err = -EBADFD;
 790                 goto done;
 791         }
 792
 793         *addr_len = sizeof(*haddr);
 794         haddr->hci_family = AF_BLUETOOTH;
 795         haddr->hci_dev    = hdev->id;
 796         haddr->hci_channel= hci_pi(sk)->channel;
 797
 798 done:
 799         release_sock(sk);
 800         return err;
 801 }
 802
 803 static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
 804                           struct sk_buff *skb)
 805 {
 806         __u32 mask = hci_pi(sk)->cmsg_mask;
 807
 808         if (mask & HCI_CMSG_DIR) {
 809                 int incoming = bt_cb(skb)->incoming;
 810                 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
 811                          &incoming);
 812         }
 813
 814         if (mask & HCI_CMSG_TSTAMP) {
 815 #ifdef CONFIG_COMPAT
 816                 struct compat_timeval ctv;
 817 #endif
 818                 struct timeval tv;
 819                 void *data;
 820                 int len;
 821
 822                 skb_get_timestamp(skb, &tv);
 823
 824                 data = &tv;
 825                 len = sizeof(tv);
 826 #ifdef CONFIG_COMPAT
 827                 if (!COMPAT_USE_64BIT_TIME &&
 828                     (msg->msg_flags & MSG_CMSG_COMPAT)) {
 829                         ctv.tv_sec = tv.tv_sec;
 830                         ctv.tv_usec = tv.tv_usec;
 831                         data = &ctv;
 832                         len = sizeof(ctv);
 833                 }
 834 #endif
 835
 836                 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
 837         }
 838 }
 839
 840 static int hci_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 841                             struct msghdr *msg, size_t len, int flags)
 842 {
 843         int noblock = flags & MSG_DONTWAIT;
 844         struct sock *sk = sock->sk;
 845         struct sk_buff *skb;
 846         int copied, err;
 847
 848         BT_DBG("sock %p, sk %p", sock, sk);
 849
 850         if (flags & (MSG_OOB))
 851                 return -EOPNOTSUPP;
 852
 853         if (sk->sk_state == BT_CLOSED)
 854                 return 0;
 855
 856         skb = skb_recv_datagram(sk, flags, noblock, &err);
 857         if (!skb)
 858                 return err;
 859
 860         copied = skb->len;
 861         if (len < copied) {
 862                 msg->msg_flags |= MSG_TRUNC;
 863                 copied = len;
 864         }
 865
 866         skb_reset_transport_header(skb);
 867         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 868
 869         switch (hci_pi(sk)->channel) {
 870         case HCI_CHANNEL_RAW:
 871                 hci_sock_cmsg(sk, msg, skb);
 872                 break;
 873         case HCI_CHANNEL_USER:
 874         case HCI_CHANNEL_CONTROL:
 875         case HCI_CHANNEL_MONITOR:
 876                 sock_recv_timestamp(msg, sk, skb);
 877                 break;
 878         }
 879
 880         skb_free_datagram(sk, skb);
 881
 882         return err ? : copied;
 883 }
 884
 885 static int hci_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 886                             struct msghdr *msg, size_t len)
 887 {
 888         struct sock *sk = sock->sk;
 889         struct hci_dev *hdev;
 890         struct sk_buff *skb;
 891         int err;
 892
 893         BT_DBG("sock %p sk %p", sock, sk);
 894
 895         if (msg->msg_flags & MSG_OOB)
 896                 return -EOPNOTSUPP;
 897
 898         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
 899                 return -EINVAL;
 900
 901         if (len < 4 || len > HCI_MAX_FRAME_SIZE)
 902                 return -EINVAL;
 903
 904         lock_sock(sk);
 905
 906         switch (hci_pi(sk)->channel) {
 907         case HCI_CHANNEL_RAW:
 908         case HCI_CHANNEL_USER:
 909                 break;
 910         case HCI_CHANNEL_CONTROL:
 911                 err = mgmt_control(sk, msg, len);
 912                 goto done;
 913         case HCI_CHANNEL_MONITOR:
 914                 err = -EOPNOTSUPP;
 915                 goto done;
 916         default:
 917                 err = -EINVAL;
 918                 goto done;
 919         }
 920
 921         hdev = hci_pi(sk)->hdev;
 922         if (!hdev) {
 923                 err = -EBADFD;
 924                 goto done;
 925         }
 926
 927         if (!test_bit(HCI_UP, &hdev->flags)) {
 928                 err = -ENETDOWN;
 929                 goto done;
 930         }
 931
 932         skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
 933         if (!skb)
 934                 goto done;
 935
 936         if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
 937                 err = -EFAULT;
 938                 goto drop;
 939         }
 940
 941         bt_cb(skb)->pkt_type = *((unsigned char *) skb->data);
 942         skb_pull(skb, 1);
 943
 944         if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
 945                 /* No permission check is needed for user channel
 946                  * since that gets enforced when binding the socket.
 947                  *
 948                  * However check that the packet type is valid.
 949                  */
 950                 if (bt_cb(skb)->pkt_type != HCI_COMMAND_PKT &&
 951                     bt_cb(skb)->pkt_type != HCI_ACLDATA_PKT &&
 952                     bt_cb(skb)->pkt_type != HCI_SCODATA_PKT) {
 953                         err = -EINVAL;
 954                         goto drop;
 955                 }
 956
 957                 skb_queue_tail(&hdev->raw_q, skb);
 958                 queue_work(hdev->workqueue, &hdev->tx_work);
 959         } else if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
 960                 u16 opcode = get_unaligned_le16(skb->data);
 961                 u16 ogf = hci_opcode_ogf(opcode);
 962                 u16 ocf = hci_opcode_ocf(opcode);
 963
 964                 if (((ogf > HCI_SFLT_MAX_OGF) ||
 965                      !hci_test_bit(ocf & HCI_FLT_OCF_BITS,
 966                                    &hci_sec_filter.ocf_mask[ogf])) &&
 967                     !capable(CAP_NET_RAW)) {
 968                         err = -EPERM;
 969                         goto drop;
 970                 }
 971
 972                 if (test_bit(HCI_RAW, &hdev->flags) || (ogf == 0x3f)) {
 973                         skb_queue_tail(&hdev->raw_q, skb);
 974                         queue_work(hdev->workqueue, &hdev->tx_work);
 975                 } else {
 976                         /* Stand-alone HCI commands must be flaged as
 977                          * single-command requests.
 978                          */
 979                         bt_cb(skb)->req.start = true;
 980
 981                         skb_queue_tail(&hdev->cmd_q, skb);
 982                         queue_work(hdev->workqueue, &hdev->cmd_work);
 983                 }
 984         } else {
 985                 if (!capable(CAP_NET_RAW)) {
 986                         err = -EPERM;
 987                         goto drop;
 988                 }
 989
 990                 skb_queue_tail(&hdev->raw_q, skb);
 991                 queue_work(hdev->workqueue, &hdev->tx_work);
 992         }
 993
 994         err = len;
 995
 996 done:
 997         release_sock(sk);
 998         return err;
 999
1000 drop:
1001         kfree_skb(skb);
1002         goto done;
1003 }
1004
1005 static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
1006                                char __user *optval, unsigned int len)
1007 {
1008         struct hci_ufilter uf = { .opcode = 0 };
1009         struct sock *sk = sock->sk;
1010         int err = 0, opt = 0;
1011
1012         BT_DBG("sk %p, opt %d", sk, optname);
1013
1014         lock_sock(sk);
1015
1016         if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1017                 err = -EBADFD;
1018                 goto done;
1019         }
1020
1021         switch (optname) {
1022         case HCI_DATA_DIR:
1023                 if (get_user(opt, (int __user *)optval)) {
1024                         err = -EFAULT;
1025                         break;
1026                 }
1027
1028                 if (opt)
1029                         hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
1030                 else
1031                         hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
1032                 break;
1033
1034         case HCI_TIME_STAMP:
1035                 if (get_user(opt, (int __user *)optval)) {
1036                         err = -EFAULT;
1037                         break;
1038                 }
1039
1040                 if (opt)
1041                         hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
1042                 else
1043                         hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
1044                 break;
1045
1046         case HCI_FILTER:
1047                 {
1048                         struct hci_filter *f = &hci_pi(sk)->filter;
1049
1050                         uf.type_mask = f->type_mask;
1051                         uf.opcode    = f->opcode;
1052                         uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1053                         uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1054                 }
1055
1056                 len = min_t(unsigned int, len, sizeof(uf));
1057                 if (copy_from_user(&uf, optval, len)) {
1058                         err = -EFAULT;
1059                         break;
1060                 }
1061
1062                 if (!capable(CAP_NET_RAW)) {
1063                         uf.type_mask &= hci_sec_filter.type_mask;
1064                         uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
1065                         uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
1066                 }
1067
1068                 {
1069                         struct hci_filter *f = &hci_pi(sk)->filter;
1070
1071                         f->type_mask = uf.type_mask;
1072                         f->opcode    = uf.opcode;
1073                         *((u32 *) f->event_mask + 0) = uf.event_mask[0];
1074                         *((u32 *) f->event_mask + 1) = uf.event_mask[1];
1075                 }
1076                 break;
1077
1078         default:
1079                 err = -ENOPROTOOPT;
1080                 break;
1081         }
1082
1083 done:
1084         release_sock(sk);
1085         return err;
1086 }
1087
1088 static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
1089                                char __user *optval, int __user *optlen)
1090 {
1091         struct hci_ufilter uf;
1092         struct sock *sk = sock->sk;
1093         int len, opt, err = 0;
1094
1095         BT_DBG("sk %p, opt %d", sk, optname);
1096
1097         if (get_user(len, optlen))
1098                 return -EFAULT;
1099
1100         lock_sock(sk);
1101
1102         if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1103                 err = -EBADFD;
1104                 goto done;
1105         }
1106
1107         switch (optname) {
1108         case HCI_DATA_DIR:
1109                 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
1110                         opt = 1;
1111                 else
1112                         opt = 0;
1113
1114                 if (put_user(opt, optval))
1115                         err = -EFAULT;
1116                 break;
1117
1118         case HCI_TIME_STAMP:
1119                 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
1120                         opt = 1;
1121                 else
1122                         opt = 0;
1123
1124                 if (put_user(opt, optval))
1125                         err = -EFAULT;
1126                 break;
1127
1128         case HCI_FILTER:
1129                 {
1130                         struct hci_filter *f = &hci_pi(sk)->filter;
1131
1132                         memset(&uf, 0, sizeof(uf));
1133                         uf.type_mask = f->type_mask;
1134                         uf.opcode    = f->opcode;
1135                         uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1136                         uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1137                 }
1138
1139                 len = min_t(unsigned int, len, sizeof(uf));
1140                 if (copy_to_user(optval, &uf, len))
1141                         err = -EFAULT;
1142                 break;
1143
1144         default:
1145                 err = -ENOPROTOOPT;
1146                 break;
1147         }
1148
1149 done:
1150         release_sock(sk);
1151         return err;
1152 }
1153
1154 static const struct proto_ops hci_sock_ops = {
1155         .family         = PF_BLUETOOTH,
1156         .owner          = THIS_MODULE,
1157         .release        = hci_sock_release,
1158         .bind           = hci_sock_bind,
1159         .getname        = hci_sock_getname,
1160         .sendmsg        = hci_sock_sendmsg,
1161         .recvmsg        = hci_sock_recvmsg,
1162         .ioctl          = hci_sock_ioctl,
1163         .poll           = datagram_poll,
1164         .listen         = sock_no_listen,
1165         .shutdown       = sock_no_shutdown,
1166         .setsockopt     = hci_sock_setsockopt,
1167         .getsockopt     = hci_sock_getsockopt,
1168         .connect        = sock_no_connect,
1169         .socketpair     = sock_no_socketpair,
1170         .accept         = sock_no_accept,
1171         .mmap           = sock_no_mmap
1172 };
1173
1174 static struct proto hci_sk_proto = {
1175         .name           = "HCI",
1176         .owner          = THIS_MODULE,
1177         .obj_size       = sizeof(struct hci_pinfo)
1178 };
1179
1180 static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
1181                            int kern)
1182 {
1183         struct sock *sk;
1184
1185         BT_DBG("sock %p", sock);
1186
1187         if (sock->type != SOCK_RAW)
1188                 return -ESOCKTNOSUPPORT;
1189
1190         sock->ops = &hci_sock_ops;
1191
1192         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto);
1193         if (!sk)
1194                 return -ENOMEM;
1195
1196         sock_init_data(sock, sk);
1197
1198         sock_reset_flag(sk, SOCK_ZAPPED);
1199
1200         sk->sk_protocol = protocol;
1201
1202         sock->state = SS_UNCONNECTED;
1203         sk->sk_state = BT_OPEN;
1204
1205         bt_sock_link(&hci_sk_list, sk);
1206         return 0;
1207 }
1208
1209 static const struct net_proto_family hci_sock_family_ops = {
1210         .family = PF_BLUETOOTH,
1211         .owner  = THIS_MODULE,
1212         .create = hci_sock_create,
1213 };
1214
1215 int __init hci_sock_init(void)
1216 {
1217         int err;
1218
1219         err = proto_register(&hci_sk_proto, 0);
1220         if (err < 0)
1221                 return err;
1222
1223         err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
1224         if (err < 0) {
1225                 BT_ERR("HCI socket registration failed");
1226                 goto error;
1227         }
1228
1229         err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
1230         if (err < 0) {
1231                 BT_ERR("Failed to create HCI proc file");
1232                 bt_sock_unregister(BTPROTO_HCI);
1233                 goto error;
1234         }
1235
1236         BT_INFO("HCI socket layer initialized");
1237
1238         return 0;
1239
1240 error:
1241         proto_unregister(&hci_sk_proto);
1242         return err;
1243 }
1244
1245 void hci_sock_cleanup(void)
1246 {
1247         bt_procfs_cleanup(&init_net, "hci");
1248         bt_sock_unregister(BTPROTO_HCI);
1249         proto_unregister(&hci_sk_proto);
1250 }