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 #include <linux/compat.h>
  27 #include <linux/export.h>
  28 #include <linux/utsname.h>
  29 #include <linux/sched.h>
  30 #include <asm/unaligned.h>
  31
  32 #include <net/bluetooth/bluetooth.h>
  33 #include <net/bluetooth/hci_core.h>
  34 #include <net/bluetooth/hci_mon.h>
  35 #include <net/bluetooth/mgmt.h>
  36
  37 #include "mgmt_util.h"
  38
  39 static LIST_HEAD(mgmt_chan_list);
  40 static DEFINE_MUTEX(mgmt_chan_list_lock);
  41
  42 static DEFINE_IDA(sock_cookie_ida);
  43
  44 static atomic_t monitor_promisc = ATOMIC_INIT(0);
  45
  46 /* ----- HCI socket interface ----- */
  47
  48 /* Socket info */
  49 #define hci_pi(sk) ((struct hci_pinfo *) sk)
  50
  51 struct hci_pinfo {
  52         struct bt_sock    bt;
  53         struct hci_dev    *hdev;
  54         struct hci_filter filter;
  55         __u8              cmsg_mask;
  56         unsigned short    channel;
  57         unsigned long     flags;
  58         __u32             cookie;
  59         char              comm[TASK_COMM_LEN];
  60         __u16             mtu;
  61 };
  62
  63 static struct hci_dev *hci_hdev_from_sock(struct sock *sk)
  64 {
  65         struct hci_dev *hdev = hci_pi(sk)->hdev;
  66
  67         if (!hdev)
  68                 return ERR_PTR(-EBADFD);
  69         if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
  70                 return ERR_PTR(-EPIPE);
  71         return hdev;
  72 }
  73
  74 void hci_sock_set_flag(struct sock *sk, int nr)
  75 {
  76         set_bit(nr, &hci_pi(sk)->flags);
  77 }
  78
  79 void hci_sock_clear_flag(struct sock *sk, int nr)
  80 {
  81         clear_bit(nr, &hci_pi(sk)->flags);
  82 }
  83
  84 int hci_sock_test_flag(struct sock *sk, int nr)
  85 {
  86         return test_bit(nr, &hci_pi(sk)->flags);
  87 }
  88
  89 unsigned short hci_sock_get_channel(struct sock *sk)
  90 {
  91         return hci_pi(sk)->channel;
  92 }
  93
  94 u32 hci_sock_get_cookie(struct sock *sk)
  95 {
  96         return hci_pi(sk)->cookie;
  97 }
  98
  99 static bool hci_sock_gen_cookie(struct sock *sk)
 100 {
 101         int id = hci_pi(sk)->cookie;
 102
 103         if (!id) {
 104                 id = ida_simple_get(&sock_cookie_ida, 1, 0, GFP_KERNEL);
 105                 if (id < 0)
 106                         id = 0xffffffff;
 107
 108                 hci_pi(sk)->cookie = id;
 109                 get_task_comm(hci_pi(sk)->comm, current);
 110                 return true;
 111         }
 112
 113         return false;
 114 }
 115
 116 static void hci_sock_free_cookie(struct sock *sk)
 117 {
 118         int id = hci_pi(sk)->cookie;
 119
 120         if (id) {
 121                 hci_pi(sk)->cookie = 0xffffffff;
 122                 ida_simple_remove(&sock_cookie_ida, id);
 123         }
 124 }
 125
 126 static inline int hci_test_bit(int nr, const void *addr)
 127 {
 128         return *((const __u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));
 129 }
 130
 131 /* Security filter */
 132 #define HCI_SFLT_MAX_OGF  5
 133
 134 struct hci_sec_filter {
 135         __u32 type_mask;
 136         __u32 event_mask[2];
 137         __u32 ocf_mask[HCI_SFLT_MAX_OGF + 1][4];
 138 };
 139
 140 static const struct hci_sec_filter hci_sec_filter = {
 141         /* Packet types */
 142         0x10,
 143         /* Events */
 144         { 0x1000d9fe, 0x0000b00c },
 145         /* Commands */
 146         {
 147                 { 0x0 },
 148                 /* OGF_LINK_CTL */
 149                 { 0xbe000006, 0x00000001, 0x00000000, 0x00 },
 150                 /* OGF_LINK_POLICY */
 151                 { 0x00005200, 0x00000000, 0x00000000, 0x00 },
 152                 /* OGF_HOST_CTL */
 153                 { 0xaab00200, 0x2b402aaa, 0x05220154, 0x00 },
 154                 /* OGF_INFO_PARAM */
 155                 { 0x000002be, 0x00000000, 0x00000000, 0x00 },
 156                 /* OGF_STATUS_PARAM */
 157                 { 0x000000ea, 0x00000000, 0x00000000, 0x00 }
 158         }
 159 };
 160
 161 static struct bt_sock_list hci_sk_list = {
 162         .lock = __RW_LOCK_UNLOCKED(hci_sk_list.lock)
 163 };
 164
 165 static bool is_filtered_packet(struct sock *sk, struct sk_buff *skb)
 166 {
 167         struct hci_filter *flt;
 168         int flt_type, flt_event;
 169
 170         /* Apply filter */
 171         flt = &hci_pi(sk)->filter;
 172
 173         flt_type = hci_skb_pkt_type(skb) & HCI_FLT_TYPE_BITS;
 174
 175         if (!test_bit(flt_type, &flt->type_mask))
 176                 return true;
 177
 178         /* Extra filter for event packets only */
 179         if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT)
 180                 return false;
 181
 182         flt_event = (*(__u8 *)skb->data & HCI_FLT_EVENT_BITS);
 183
 184         if (!hci_test_bit(flt_event, &flt->event_mask))
 185                 return true;
 186
 187         /* Check filter only when opcode is set */
 188         if (!flt->opcode)
 189                 return false;
 190
 191         if (flt_event == HCI_EV_CMD_COMPLETE &&
 192             flt->opcode != get_unaligned((__le16 *)(skb->data + 3)))
 193                 return true;
 194
 195         if (flt_event == HCI_EV_CMD_STATUS &&
 196             flt->opcode != get_unaligned((__le16 *)(skb->data + 4)))
 197                 return true;
 198
 199         return false;
 200 }
 201
 202 /* Send frame to RAW socket */
 203 void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
 204 {
 205         struct sock *sk;
 206         struct sk_buff *skb_copy = NULL;
 207
 208         BT_DBG("hdev %p len %d", hdev, skb->len);
 209
 210         read_lock(&hci_sk_list.lock);
 211
 212         sk_for_each(sk, &hci_sk_list.head) {
 213                 struct sk_buff *nskb;
 214
 215                 if (sk->sk_state != BT_BOUND || hci_pi(sk)->hdev != hdev)
 216                         continue;
 217
 218                 /* Don't send frame to the socket it came from */
 219                 if (skb->sk == sk)
 220                         continue;
 221
 222                 if (hci_pi(sk)->channel == HCI_CHANNEL_RAW) {
 223                         if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT &&
 224                             hci_skb_pkt_type(skb) != HCI_EVENT_PKT &&
 225                             hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
 226                             hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
 227                             hci_skb_pkt_type(skb) != HCI_ISODATA_PKT)
 228                                 continue;
 229                         if (is_filtered_packet(sk, skb))
 230                                 continue;
 231                 } else if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
 232                         if (!bt_cb(skb)->incoming)
 233                                 continue;
 234                         if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT &&
 235                             hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
 236                             hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
 237                             hci_skb_pkt_type(skb) != HCI_ISODATA_PKT)
 238                                 continue;
 239                 } else {
 240                         /* Don't send frame to other channel types */
 241                         continue;
 242                 }
 243
 244                 if (!skb_copy) {
 245                         /* Create a private copy with headroom */
 246                         skb_copy = __pskb_copy_fclone(skb, 1, GFP_ATOMIC, true);
 247                         if (!skb_copy)
 248                                 continue;
 249
 250                         /* Put type byte before the data */
 251                         memcpy(skb_push(skb_copy, 1), &hci_skb_pkt_type(skb), 1);
 252                 }
 253
 254                 nskb = skb_clone(skb_copy, GFP_ATOMIC);
 255                 if (!nskb)
 256                         continue;
 257
 258                 if (sock_queue_rcv_skb(sk, nskb))
 259                         kfree_skb(nskb);
 260         }
 261
 262         read_unlock(&hci_sk_list.lock);
 263
 264         kfree_skb(skb_copy);
 265 }
 266
 267 /* Send frame to sockets with specific channel */
 268 static void __hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
 269                                   int flag, struct sock *skip_sk)
 270 {
 271         struct sock *sk;
 272
 273         BT_DBG("channel %u len %d", channel, skb->len);
 274
 275         sk_for_each(sk, &hci_sk_list.head) {
 276                 struct sk_buff *nskb;
 277
 278                 /* Ignore socket without the flag set */
 279                 if (!hci_sock_test_flag(sk, flag))
 280                         continue;
 281
 282                 /* Skip the original socket */
 283                 if (sk == skip_sk)
 284                         continue;
 285
 286                 if (sk->sk_state != BT_BOUND)
 287                         continue;
 288
 289                 if (hci_pi(sk)->channel != channel)
 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 }
 301
 302 void hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
 303                          int flag, struct sock *skip_sk)
 304 {
 305         read_lock(&hci_sk_list.lock);
 306         __hci_send_to_channel(channel, skb, flag, skip_sk);
 307         read_unlock(&hci_sk_list.lock);
 308 }
 309
 310 /* Send frame to monitor socket */
 311 void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
 312 {
 313         struct sk_buff *skb_copy = NULL;
 314         struct hci_mon_hdr *hdr;
 315         __le16 opcode;
 316
 317         if (!atomic_read(&monitor_promisc))
 318                 return;
 319
 320         BT_DBG("hdev %p len %d", hdev, skb->len);
 321
 322         switch (hci_skb_pkt_type(skb)) {
 323         case HCI_COMMAND_PKT:
 324                 opcode = cpu_to_le16(HCI_MON_COMMAND_PKT);
 325                 break;
 326         case HCI_EVENT_PKT:
 327                 opcode = cpu_to_le16(HCI_MON_EVENT_PKT);
 328                 break;
 329         case HCI_ACLDATA_PKT:
 330                 if (bt_cb(skb)->incoming)
 331                         opcode = cpu_to_le16(HCI_MON_ACL_RX_PKT);
 332                 else
 333                         opcode = cpu_to_le16(HCI_MON_ACL_TX_PKT);
 334                 break;
 335         case HCI_SCODATA_PKT:
 336                 if (bt_cb(skb)->incoming)
 337                         opcode = cpu_to_le16(HCI_MON_SCO_RX_PKT);
 338                 else
 339                         opcode = cpu_to_le16(HCI_MON_SCO_TX_PKT);
 340                 break;
 341         case HCI_ISODATA_PKT:
 342                 if (bt_cb(skb)->incoming)
 343                         opcode = cpu_to_le16(HCI_MON_ISO_RX_PKT);
 344                 else
 345                         opcode = cpu_to_le16(HCI_MON_ISO_TX_PKT);
 346                 break;
 347         case HCI_DIAG_PKT:
 348                 opcode = cpu_to_le16(HCI_MON_VENDOR_DIAG);
 349                 break;
 350         default:
 351                 return;
 352         }
 353
 354         /* Create a private copy with headroom */
 355         skb_copy = __pskb_copy_fclone(skb, HCI_MON_HDR_SIZE, GFP_ATOMIC, true);
 356         if (!skb_copy)
 357                 return;
 358
 359         /* Put header before the data */
 360         hdr = skb_push(skb_copy, HCI_MON_HDR_SIZE);
 361         hdr->opcode = opcode;
 362         hdr->index = cpu_to_le16(hdev->id);
 363         hdr->len = cpu_to_le16(skb->len);
 364
 365         hci_send_to_channel(HCI_CHANNEL_MONITOR, skb_copy,
 366                             HCI_SOCK_TRUSTED, NULL);
 367         kfree_skb(skb_copy);
 368 }
 369
 370 void hci_send_monitor_ctrl_event(struct hci_dev *hdev, u16 event,
 371                                  void *data, u16 data_len, ktime_t tstamp,
 372                                  int flag, struct sock *skip_sk)
 373 {
 374         struct sock *sk;
 375         __le16 index;
 376
 377         if (hdev)
 378                 index = cpu_to_le16(hdev->id);
 379         else
 380                 index = cpu_to_le16(MGMT_INDEX_NONE);
 381
 382         read_lock(&hci_sk_list.lock);
 383
 384         sk_for_each(sk, &hci_sk_list.head) {
 385                 struct hci_mon_hdr *hdr;
 386                 struct sk_buff *skb;
 387
 388                 if (hci_pi(sk)->channel != HCI_CHANNEL_CONTROL)
 389                         continue;
 390
 391                 /* Ignore socket without the flag set */
 392                 if (!hci_sock_test_flag(sk, flag))
 393                         continue;
 394
 395                 /* Skip the original socket */
 396                 if (sk == skip_sk)
 397                         continue;
 398
 399                 skb = bt_skb_alloc(6 + data_len, GFP_ATOMIC);
 400                 if (!skb)
 401                         continue;
 402
 403                 put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
 404                 put_unaligned_le16(event, skb_put(skb, 2));
 405
 406                 if (data)
 407                         skb_put_data(skb, data, data_len);
 408
 409                 skb->tstamp = tstamp;
 410
 411                 hdr = skb_push(skb, HCI_MON_HDR_SIZE);
 412                 hdr->opcode = cpu_to_le16(HCI_MON_CTRL_EVENT);
 413                 hdr->index = index;
 414                 hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
 415
 416                 __hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
 417                                       HCI_SOCK_TRUSTED, NULL);
 418                 kfree_skb(skb);
 419         }
 420
 421         read_unlock(&hci_sk_list.lock);
 422 }
 423
 424 static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
 425 {
 426         struct hci_mon_hdr *hdr;
 427         struct hci_mon_new_index *ni;
 428         struct hci_mon_index_info *ii;
 429         struct sk_buff *skb;
 430         __le16 opcode;
 431
 432         switch (event) {
 433         case HCI_DEV_REG:
 434                 skb = bt_skb_alloc(HCI_MON_NEW_INDEX_SIZE, GFP_ATOMIC);
 435                 if (!skb)
 436                         return NULL;
 437
 438                 ni = skb_put(skb, HCI_MON_NEW_INDEX_SIZE);
 439                 ni->type = hdev->dev_type;
 440                 ni->bus = hdev->bus;
 441                 bacpy(&ni->bdaddr, &hdev->bdaddr);
 442                 memcpy(ni->name, hdev->name, 8);
 443
 444                 opcode = cpu_to_le16(HCI_MON_NEW_INDEX);
 445                 break;
 446
 447         case HCI_DEV_UNREG:
 448                 skb = bt_skb_alloc(0, GFP_ATOMIC);
 449                 if (!skb)
 450                         return NULL;
 451
 452                 opcode = cpu_to_le16(HCI_MON_DEL_INDEX);
 453                 break;
 454
 455         case HCI_DEV_SETUP:
 456                 if (hdev->manufacturer == 0xffff)
 457                         return NULL;
 458                 fallthrough;
 459
 460         case HCI_DEV_UP:
 461                 skb = bt_skb_alloc(HCI_MON_INDEX_INFO_SIZE, GFP_ATOMIC);
 462                 if (!skb)
 463                         return NULL;
 464
 465                 ii = skb_put(skb, HCI_MON_INDEX_INFO_SIZE);
 466                 bacpy(&ii->bdaddr, &hdev->bdaddr);
 467                 ii->manufacturer = cpu_to_le16(hdev->manufacturer);
 468
 469                 opcode = cpu_to_le16(HCI_MON_INDEX_INFO);
 470                 break;
 471
 472         case HCI_DEV_OPEN:
 473                 skb = bt_skb_alloc(0, GFP_ATOMIC);
 474                 if (!skb)
 475                         return NULL;
 476
 477                 opcode = cpu_to_le16(HCI_MON_OPEN_INDEX);
 478                 break;
 479
 480         case HCI_DEV_CLOSE:
 481                 skb = bt_skb_alloc(0, GFP_ATOMIC);
 482                 if (!skb)
 483                         return NULL;
 484
 485                 opcode = cpu_to_le16(HCI_MON_CLOSE_INDEX);
 486                 break;
 487
 488         default:
 489                 return NULL;
 490         }
 491
 492         __net_timestamp(skb);
 493
 494         hdr = skb_push(skb, HCI_MON_HDR_SIZE);
 495         hdr->opcode = opcode;
 496         hdr->index = cpu_to_le16(hdev->id);
 497         hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
 498
 499         return skb;
 500 }
 501
 502 static struct sk_buff *create_monitor_ctrl_open(struct sock *sk)
 503 {
 504         struct hci_mon_hdr *hdr;
 505         struct sk_buff *skb;
 506         u16 format;
 507         u8 ver[3];
 508         u32 flags;
 509
 510         /* No message needed when cookie is not present */
 511         if (!hci_pi(sk)->cookie)
 512                 return NULL;
 513
 514         switch (hci_pi(sk)->channel) {
 515         case HCI_CHANNEL_RAW:
 516                 format = 0x0000;
 517                 ver[0] = BT_SUBSYS_VERSION;
 518                 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
 519                 break;
 520         case HCI_CHANNEL_USER:
 521                 format = 0x0001;
 522                 ver[0] = BT_SUBSYS_VERSION;
 523                 put_unaligned_le16(BT_SUBSYS_REVISION, ver + 1);
 524                 break;
 525         case HCI_CHANNEL_CONTROL:
 526                 format = 0x0002;
 527                 mgmt_fill_version_info(ver);
 528                 break;
 529         default:
 530                 /* No message for unsupported format */
 531                 return NULL;
 532         }
 533
 534         skb = bt_skb_alloc(14 + TASK_COMM_LEN , GFP_ATOMIC);
 535         if (!skb)
 536                 return NULL;
 537
 538         flags = hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) ? 0x1 : 0x0;
 539
 540         put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
 541         put_unaligned_le16(format, skb_put(skb, 2));
 542         skb_put_data(skb, ver, sizeof(ver));
 543         put_unaligned_le32(flags, skb_put(skb, 4));
 544         skb_put_u8(skb, TASK_COMM_LEN);
 545         skb_put_data(skb, hci_pi(sk)->comm, TASK_COMM_LEN);
 546
 547         __net_timestamp(skb);
 548
 549         hdr = skb_push(skb, HCI_MON_HDR_SIZE);
 550         hdr->opcode = cpu_to_le16(HCI_MON_CTRL_OPEN);
 551         if (hci_pi(sk)->hdev)
 552                 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
 553         else
 554                 hdr->index = cpu_to_le16(HCI_DEV_NONE);
 555         hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
 556
 557         return skb;
 558 }
 559
 560 static struct sk_buff *create_monitor_ctrl_close(struct sock *sk)
 561 {
 562         struct hci_mon_hdr *hdr;
 563         struct sk_buff *skb;
 564
 565         /* No message needed when cookie is not present */
 566         if (!hci_pi(sk)->cookie)
 567                 return NULL;
 568
 569         switch (hci_pi(sk)->channel) {
 570         case HCI_CHANNEL_RAW:
 571         case HCI_CHANNEL_USER:
 572         case HCI_CHANNEL_CONTROL:
 573                 break;
 574         default:
 575                 /* No message for unsupported format */
 576                 return NULL;
 577         }
 578
 579         skb = bt_skb_alloc(4, GFP_ATOMIC);
 580         if (!skb)
 581                 return NULL;
 582
 583         put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
 584
 585         __net_timestamp(skb);
 586
 587         hdr = skb_push(skb, HCI_MON_HDR_SIZE);
 588         hdr->opcode = cpu_to_le16(HCI_MON_CTRL_CLOSE);
 589         if (hci_pi(sk)->hdev)
 590                 hdr->index = cpu_to_le16(hci_pi(sk)->hdev->id);
 591         else
 592                 hdr->index = cpu_to_le16(HCI_DEV_NONE);
 593         hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
 594
 595         return skb;
 596 }
 597
 598 static struct sk_buff *create_monitor_ctrl_command(struct sock *sk, u16 index,
 599                                                    u16 opcode, u16 len,
 600                                                    const void *buf)
 601 {
 602         struct hci_mon_hdr *hdr;
 603         struct sk_buff *skb;
 604
 605         skb = bt_skb_alloc(6 + len, GFP_ATOMIC);
 606         if (!skb)
 607                 return NULL;
 608
 609         put_unaligned_le32(hci_pi(sk)->cookie, skb_put(skb, 4));
 610         put_unaligned_le16(opcode, skb_put(skb, 2));
 611
 612         if (buf)
 613                 skb_put_data(skb, buf, len);
 614
 615         __net_timestamp(skb);
 616
 617         hdr = skb_push(skb, HCI_MON_HDR_SIZE);
 618         hdr->opcode = cpu_to_le16(HCI_MON_CTRL_COMMAND);
 619         hdr->index = cpu_to_le16(index);
 620         hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
 621
 622         return skb;
 623 }
 624
 625 static void __printf(2, 3)
 626 send_monitor_note(struct sock *sk, const char *fmt, ...)
 627 {
 628         size_t len;
 629         struct hci_mon_hdr *hdr;
 630         struct sk_buff *skb;
 631         va_list args;
 632
 633         va_start(args, fmt);
 634         len = vsnprintf(NULL, 0, fmt, args);
 635         va_end(args);
 636
 637         skb = bt_skb_alloc(len + 1, GFP_ATOMIC);
 638         if (!skb)
 639                 return;
 640
 641         va_start(args, fmt);
 642         vsprintf(skb_put(skb, len), fmt, args);
 643         *(u8 *)skb_put(skb, 1) = 0;
 644         va_end(args);
 645
 646         __net_timestamp(skb);
 647
 648         hdr = (void *)skb_push(skb, HCI_MON_HDR_SIZE);
 649         hdr->opcode = cpu_to_le16(HCI_MON_SYSTEM_NOTE);
 650         hdr->index = cpu_to_le16(HCI_DEV_NONE);
 651         hdr->len = cpu_to_le16(skb->len - HCI_MON_HDR_SIZE);
 652
 653         if (sock_queue_rcv_skb(sk, skb))
 654                 kfree_skb(skb);
 655 }
 656
 657 static void send_monitor_replay(struct sock *sk)
 658 {
 659         struct hci_dev *hdev;
 660
 661         read_lock(&hci_dev_list_lock);
 662
 663         list_for_each_entry(hdev, &hci_dev_list, list) {
 664                 struct sk_buff *skb;
 665
 666                 skb = create_monitor_event(hdev, HCI_DEV_REG);
 667                 if (!skb)
 668                         continue;
 669
 670                 if (sock_queue_rcv_skb(sk, skb))
 671                         kfree_skb(skb);
 672
 673                 if (!test_bit(HCI_RUNNING, &hdev->flags))
 674                         continue;
 675
 676                 skb = create_monitor_event(hdev, HCI_DEV_OPEN);
 677                 if (!skb)
 678                         continue;
 679
 680                 if (sock_queue_rcv_skb(sk, skb))
 681                         kfree_skb(skb);
 682
 683                 if (test_bit(HCI_UP, &hdev->flags))
 684                         skb = create_monitor_event(hdev, HCI_DEV_UP);
 685                 else if (hci_dev_test_flag(hdev, HCI_SETUP))
 686                         skb = create_monitor_event(hdev, HCI_DEV_SETUP);
 687                 else
 688                         skb = NULL;
 689
 690                 if (skb) {
 691                         if (sock_queue_rcv_skb(sk, skb))
 692                                 kfree_skb(skb);
 693                 }
 694         }
 695
 696         read_unlock(&hci_dev_list_lock);
 697 }
 698
 699 static void send_monitor_control_replay(struct sock *mon_sk)
 700 {
 701         struct sock *sk;
 702
 703         read_lock(&hci_sk_list.lock);
 704
 705         sk_for_each(sk, &hci_sk_list.head) {
 706                 struct sk_buff *skb;
 707
 708                 skb = create_monitor_ctrl_open(sk);
 709                 if (!skb)
 710                         continue;
 711
 712                 if (sock_queue_rcv_skb(mon_sk, skb))
 713                         kfree_skb(skb);
 714         }
 715
 716         read_unlock(&hci_sk_list.lock);
 717 }
 718
 719 /* Generate internal stack event */
 720 static void hci_si_event(struct hci_dev *hdev, int type, int dlen, void *data)
 721 {
 722         struct hci_event_hdr *hdr;
 723         struct hci_ev_stack_internal *ev;
 724         struct sk_buff *skb;
 725
 726         skb = bt_skb_alloc(HCI_EVENT_HDR_SIZE + sizeof(*ev) + dlen, GFP_ATOMIC);
 727         if (!skb)
 728                 return;
 729
 730         hdr = skb_put(skb, HCI_EVENT_HDR_SIZE);
 731         hdr->evt  = HCI_EV_STACK_INTERNAL;
 732         hdr->plen = sizeof(*ev) + dlen;
 733
 734         ev = skb_put(skb, sizeof(*ev) + dlen);
 735         ev->type = type;
 736         memcpy(ev->data, data, dlen);
 737
 738         bt_cb(skb)->incoming = 1;
 739         __net_timestamp(skb);
 740
 741         hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
 742         hci_send_to_sock(hdev, skb);
 743         kfree_skb(skb);
 744 }
 745
 746 void hci_sock_dev_event(struct hci_dev *hdev, int event)
 747 {
 748         BT_DBG("hdev %s event %d", hdev->name, event);
 749
 750         if (atomic_read(&monitor_promisc)) {
 751                 struct sk_buff *skb;
 752
 753                 /* Send event to monitor */
 754                 skb = create_monitor_event(hdev, event);
 755                 if (skb) {
 756                         hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
 757                                             HCI_SOCK_TRUSTED, NULL);
 758                         kfree_skb(skb);
 759                 }
 760         }
 761
 762         if (event <= HCI_DEV_DOWN) {
 763                 struct hci_ev_si_device ev;
 764
 765                 /* Send event to sockets */
 766                 ev.event  = event;
 767                 ev.dev_id = hdev->id;
 768                 hci_si_event(NULL, HCI_EV_SI_DEVICE, sizeof(ev), &ev);
 769         }
 770
 771         if (event == HCI_DEV_UNREG) {
 772                 struct sock *sk;
 773
 774                 /* Wake up sockets using this dead device */
 775                 read_lock(&hci_sk_list.lock);
 776                 sk_for_each(sk, &hci_sk_list.head) {
 777                         if (hci_pi(sk)->hdev == hdev) {
 778                                 sk->sk_err = EPIPE;
 779                                 sk->sk_state_change(sk);
 780                         }
 781                 }
 782                 read_unlock(&hci_sk_list.lock);
 783         }
 784 }
 785
 786 static struct hci_mgmt_chan *__hci_mgmt_chan_find(unsigned short channel)
 787 {
 788         struct hci_mgmt_chan *c;
 789
 790         list_for_each_entry(c, &mgmt_chan_list, list) {
 791                 if (c->channel == channel)
 792                         return c;
 793         }
 794
 795         return NULL;
 796 }
 797
 798 static struct hci_mgmt_chan *hci_mgmt_chan_find(unsigned short channel)
 799 {
 800         struct hci_mgmt_chan *c;
 801
 802         mutex_lock(&mgmt_chan_list_lock);
 803         c = __hci_mgmt_chan_find(channel);
 804         mutex_unlock(&mgmt_chan_list_lock);
 805
 806         return c;
 807 }
 808
 809 int hci_mgmt_chan_register(struct hci_mgmt_chan *c)
 810 {
 811         if (c->channel < HCI_CHANNEL_CONTROL)
 812                 return -EINVAL;
 813
 814         mutex_lock(&mgmt_chan_list_lock);
 815         if (__hci_mgmt_chan_find(c->channel)) {
 816                 mutex_unlock(&mgmt_chan_list_lock);
 817                 return -EALREADY;
 818         }
 819
 820         list_add_tail(&c->list, &mgmt_chan_list);
 821
 822         mutex_unlock(&mgmt_chan_list_lock);
 823
 824         return 0;
 825 }
 826 EXPORT_SYMBOL(hci_mgmt_chan_register);
 827
 828 void hci_mgmt_chan_unregister(struct hci_mgmt_chan *c)
 829 {
 830         mutex_lock(&mgmt_chan_list_lock);
 831         list_del(&c->list);
 832         mutex_unlock(&mgmt_chan_list_lock);
 833 }
 834 EXPORT_SYMBOL(hci_mgmt_chan_unregister);
 835
 836 static int hci_sock_release(struct socket *sock)
 837 {
 838         struct sock *sk = sock->sk;
 839         struct hci_dev *hdev;
 840         struct sk_buff *skb;
 841
 842         BT_DBG("sock %p sk %p", sock, sk);
 843
 844         if (!sk)
 845                 return 0;
 846
 847         lock_sock(sk);
 848
 849         switch (hci_pi(sk)->channel) {
 850         case HCI_CHANNEL_MONITOR:
 851                 atomic_dec(&monitor_promisc);
 852                 break;
 853         case HCI_CHANNEL_RAW:
 854         case HCI_CHANNEL_USER:
 855         case HCI_CHANNEL_CONTROL:
 856                 /* Send event to monitor */
 857                 skb = create_monitor_ctrl_close(sk);
 858                 if (skb) {
 859                         hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
 860                                             HCI_SOCK_TRUSTED, NULL);
 861                         kfree_skb(skb);
 862                 }
 863
 864                 hci_sock_free_cookie(sk);
 865                 break;
 866         }
 867
 868         bt_sock_unlink(&hci_sk_list, sk);
 869
 870         hdev = hci_pi(sk)->hdev;
 871         if (hdev) {
 872                 if (hci_pi(sk)->channel == HCI_CHANNEL_USER &&
 873                     !hci_dev_test_flag(hdev, HCI_UNREGISTER)) {
 874                         /* When releasing a user channel exclusive access,
 875                          * call hci_dev_do_close directly instead of calling
 876                          * hci_dev_close to ensure the exclusive access will
 877                          * be released and the controller brought back down.
 878                          *
 879                          * The checking of HCI_AUTO_OFF is not needed in this
 880                          * case since it will have been cleared already when
 881                          * opening the user channel.
 882                          *
 883                          * Make sure to also check that we haven't already
 884                          * unregistered since all the cleanup will have already
 885                          * been complete and hdev will get released when we put
 886                          * below.
 887                          */
 888                         hci_dev_do_close(hdev);
 889                         hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
 890                         mgmt_index_added(hdev);
 891                 }
 892
 893                 atomic_dec(&hdev->promisc);
 894                 hci_dev_put(hdev);
 895         }
 896
 897         sock_orphan(sk);
 898         release_sock(sk);
 899         sock_put(sk);
 900         return 0;
 901 }
 902
 903 static int hci_sock_reject_list_add(struct hci_dev *hdev, void __user *arg)
 904 {
 905         bdaddr_t bdaddr;
 906         int err;
 907
 908         if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
 909                 return -EFAULT;
 910
 911         hci_dev_lock(hdev);
 912
 913         err = hci_bdaddr_list_add(&hdev->reject_list, &bdaddr, BDADDR_BREDR);
 914
 915         hci_dev_unlock(hdev);
 916
 917         return err;
 918 }
 919
 920 static int hci_sock_reject_list_del(struct hci_dev *hdev, void __user *arg)
 921 {
 922         bdaddr_t bdaddr;
 923         int err;
 924
 925         if (copy_from_user(&bdaddr, arg, sizeof(bdaddr)))
 926                 return -EFAULT;
 927
 928         hci_dev_lock(hdev);
 929
 930         err = hci_bdaddr_list_del(&hdev->reject_list, &bdaddr, BDADDR_BREDR);
 931
 932         hci_dev_unlock(hdev);
 933
 934         return err;
 935 }
 936
 937 /* Ioctls that require bound socket */
 938 static int hci_sock_bound_ioctl(struct sock *sk, unsigned int cmd,
 939                                 unsigned long arg)
 940 {
 941         struct hci_dev *hdev = hci_hdev_from_sock(sk);
 942
 943         if (IS_ERR(hdev))
 944                 return PTR_ERR(hdev);
 945
 946         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
 947                 return -EBUSY;
 948
 949         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
 950                 return -EOPNOTSUPP;
 951
 952         if (hdev->dev_type != HCI_PRIMARY)
 953                 return -EOPNOTSUPP;
 954
 955         switch (cmd) {
 956         case HCISETRAW:
 957                 if (!capable(CAP_NET_ADMIN))
 958                         return -EPERM;
 959                 return -EOPNOTSUPP;
 960
 961         case HCIGETCONNINFO:
 962                 return hci_get_conn_info(hdev, (void __user *)arg);
 963
 964         case HCIGETAUTHINFO:
 965                 return hci_get_auth_info(hdev, (void __user *)arg);
 966
 967         case HCIBLOCKADDR:
 968                 if (!capable(CAP_NET_ADMIN))
 969                         return -EPERM;
 970                 return hci_sock_reject_list_add(hdev, (void __user *)arg);
 971
 972         case HCIUNBLOCKADDR:
 973                 if (!capable(CAP_NET_ADMIN))
 974                         return -EPERM;
 975                 return hci_sock_reject_list_del(hdev, (void __user *)arg);
 976         }
 977
 978         return -ENOIOCTLCMD;
 979 }
 980
 981 static int hci_sock_ioctl(struct socket *sock, unsigned int cmd,
 982                           unsigned long arg)
 983 {
 984         void __user *argp = (void __user *)arg;
 985         struct sock *sk = sock->sk;
 986         int err;
 987
 988         BT_DBG("cmd %x arg %lx", cmd, arg);
 989
 990         /* Make sure the cmd is valid before doing anything */
 991         switch (cmd) {
 992         case HCIGETDEVLIST:
 993         case HCIGETDEVINFO:
 994         case HCIGETCONNLIST:
 995         case HCIDEVUP:
 996         case HCIDEVDOWN:
 997         case HCIDEVRESET:
 998         case HCIDEVRESTAT:
 999         case HCISETSCAN:
1000         case HCISETAUTH:
1001         case HCISETENCRYPT:
1002         case HCISETPTYPE:
1003         case HCISETLINKPOL:
1004         case HCISETLINKMODE:
1005         case HCISETACLMTU:
1006         case HCISETSCOMTU:
1007         case HCIINQUIRY:
1008         case HCISETRAW:
1009         case HCIGETCONNINFO:
1010         case HCIGETAUTHINFO:
1011         case HCIBLOCKADDR:
1012         case HCIUNBLOCKADDR:
1013                 break;
1014         default:
1015                 return -ENOIOCTLCMD;
1016         }
1017
1018         lock_sock(sk);
1019
1020         if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1021                 err = -EBADFD;
1022                 goto done;
1023         }
1024
1025         /* When calling an ioctl on an unbound raw socket, then ensure
1026          * that the monitor gets informed. Ensure that the resulting event
1027          * is only send once by checking if the cookie exists or not. The
1028          * socket cookie will be only ever generated once for the lifetime
1029          * of a given socket.
1030          */
1031         if (hci_sock_gen_cookie(sk)) {
1032                 struct sk_buff *skb;
1033
1034                 /* Perform careful checks before setting the HCI_SOCK_TRUSTED
1035                  * flag. Make sure that not only the current task but also
1036                  * the socket opener has the required capability, since
1037                  * privileged programs can be tricked into making ioctl calls
1038                  * on HCI sockets, and the socket should not be marked as
1039                  * trusted simply because the ioctl caller is privileged.
1040                  */
1041                 if (sk_capable(sk, CAP_NET_ADMIN))
1042                         hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1043
1044                 /* Send event to monitor */
1045                 skb = create_monitor_ctrl_open(sk);
1046                 if (skb) {
1047                         hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1048                                             HCI_SOCK_TRUSTED, NULL);
1049                         kfree_skb(skb);
1050                 }
1051         }
1052
1053         release_sock(sk);
1054
1055         switch (cmd) {
1056         case HCIGETDEVLIST:
1057                 return hci_get_dev_list(argp);
1058
1059         case HCIGETDEVINFO:
1060                 return hci_get_dev_info(argp);
1061
1062         case HCIGETCONNLIST:
1063                 return hci_get_conn_list(argp);
1064
1065         case HCIDEVUP:
1066                 if (!capable(CAP_NET_ADMIN))
1067                         return -EPERM;
1068                 return hci_dev_open(arg);
1069
1070         case HCIDEVDOWN:
1071                 if (!capable(CAP_NET_ADMIN))
1072                         return -EPERM;
1073                 return hci_dev_close(arg);
1074
1075         case HCIDEVRESET:
1076                 if (!capable(CAP_NET_ADMIN))
1077                         return -EPERM;
1078                 return hci_dev_reset(arg);
1079
1080         case HCIDEVRESTAT:
1081                 if (!capable(CAP_NET_ADMIN))
1082                         return -EPERM;
1083                 return hci_dev_reset_stat(arg);
1084
1085         case HCISETSCAN:
1086         case HCISETAUTH:
1087         case HCISETENCRYPT:
1088         case HCISETPTYPE:
1089         case HCISETLINKPOL:
1090         case HCISETLINKMODE:
1091         case HCISETACLMTU:
1092         case HCISETSCOMTU:
1093                 if (!capable(CAP_NET_ADMIN))
1094                         return -EPERM;
1095                 return hci_dev_cmd(cmd, argp);
1096
1097         case HCIINQUIRY:
1098                 return hci_inquiry(argp);
1099         }
1100
1101         lock_sock(sk);
1102
1103         err = hci_sock_bound_ioctl(sk, cmd, arg);
1104
1105 done:
1106         release_sock(sk);
1107         return err;
1108 }
1109
1110 #ifdef CONFIG_COMPAT
1111 static int hci_sock_compat_ioctl(struct socket *sock, unsigned int cmd,
1112                                  unsigned long arg)
1113 {
1114         switch (cmd) {
1115         case HCIDEVUP:
1116         case HCIDEVDOWN:
1117         case HCIDEVRESET:
1118         case HCIDEVRESTAT:
1119                 return hci_sock_ioctl(sock, cmd, arg);
1120         }
1121
1122         return hci_sock_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
1123 }
1124 #endif
1125
1126 static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
1127                          int addr_len)
1128 {
1129         struct sockaddr_hci haddr;
1130         struct sock *sk = sock->sk;
1131         struct hci_dev *hdev = NULL;
1132         struct sk_buff *skb;
1133         int len, err = 0;
1134
1135         BT_DBG("sock %p sk %p", sock, sk);
1136
1137         if (!addr)
1138                 return -EINVAL;
1139
1140         memset(&haddr, 0, sizeof(haddr));
1141         len = min_t(unsigned int, sizeof(haddr), addr_len);
1142         memcpy(&haddr, addr, len);
1143
1144         if (haddr.hci_family != AF_BLUETOOTH)
1145                 return -EINVAL;
1146
1147         lock_sock(sk);
1148
1149         /* Allow detaching from dead device and attaching to alive device, if
1150          * the caller wants to re-bind (instead of close) this socket in
1151          * response to hci_sock_dev_event(HCI_DEV_UNREG) notification.
1152          */
1153         hdev = hci_pi(sk)->hdev;
1154         if (hdev && hci_dev_test_flag(hdev, HCI_UNREGISTER)) {
1155                 hci_pi(sk)->hdev = NULL;
1156                 sk->sk_state = BT_OPEN;
1157                 hci_dev_put(hdev);
1158         }
1159         hdev = NULL;
1160
1161         if (sk->sk_state == BT_BOUND) {
1162                 err = -EALREADY;
1163                 goto done;
1164         }
1165
1166         switch (haddr.hci_channel) {
1167         case HCI_CHANNEL_RAW:
1168                 if (hci_pi(sk)->hdev) {
1169                         err = -EALREADY;
1170                         goto done;
1171                 }
1172
1173                 if (haddr.hci_dev != HCI_DEV_NONE) {
1174                         hdev = hci_dev_get(haddr.hci_dev);
1175                         if (!hdev) {
1176                                 err = -ENODEV;
1177                                 goto done;
1178                         }
1179
1180                         atomic_inc(&hdev->promisc);
1181                 }
1182
1183                 hci_pi(sk)->channel = haddr.hci_channel;
1184
1185                 if (!hci_sock_gen_cookie(sk)) {
1186                         /* In the case when a cookie has already been assigned,
1187                          * then there has been already an ioctl issued against
1188                          * an unbound socket and with that triggered an open
1189                          * notification. Send a close notification first to
1190                          * allow the state transition to bounded.
1191                          */
1192                         skb = create_monitor_ctrl_close(sk);
1193                         if (skb) {
1194                                 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1195                                                     HCI_SOCK_TRUSTED, NULL);
1196                                 kfree_skb(skb);
1197                         }
1198                 }
1199
1200                 if (capable(CAP_NET_ADMIN))
1201                         hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1202
1203                 hci_pi(sk)->hdev = hdev;
1204
1205                 /* Send event to monitor */
1206                 skb = create_monitor_ctrl_open(sk);
1207                 if (skb) {
1208                         hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1209                                             HCI_SOCK_TRUSTED, NULL);
1210                         kfree_skb(skb);
1211                 }
1212                 break;
1213
1214         case HCI_CHANNEL_USER:
1215                 if (hci_pi(sk)->hdev) {
1216                         err = -EALREADY;
1217                         goto done;
1218                 }
1219
1220                 if (haddr.hci_dev == HCI_DEV_NONE) {
1221                         err = -EINVAL;
1222                         goto done;
1223                 }
1224
1225                 if (!capable(CAP_NET_ADMIN)) {
1226                         err = -EPERM;
1227                         goto done;
1228                 }
1229
1230                 hdev = hci_dev_get(haddr.hci_dev);
1231                 if (!hdev) {
1232                         err = -ENODEV;
1233                         goto done;
1234                 }
1235
1236                 if (test_bit(HCI_INIT, &hdev->flags) ||
1237                     hci_dev_test_flag(hdev, HCI_SETUP) ||
1238                     hci_dev_test_flag(hdev, HCI_CONFIG) ||
1239                     (!hci_dev_test_flag(hdev, HCI_AUTO_OFF) &&
1240                      test_bit(HCI_UP, &hdev->flags))) {
1241                         err = -EBUSY;
1242                         hci_dev_put(hdev);
1243                         goto done;
1244                 }
1245
1246                 if (hci_dev_test_and_set_flag(hdev, HCI_USER_CHANNEL)) {
1247                         err = -EUSERS;
1248                         hci_dev_put(hdev);
1249                         goto done;
1250                 }
1251
1252                 mgmt_index_removed(hdev);
1253
1254                 err = hci_dev_open(hdev->id);
1255                 if (err) {
1256                         if (err == -EALREADY) {
1257                                 /* In case the transport is already up and
1258                                  * running, clear the error here.
1259                                  *
1260                                  * This can happen when opening a user
1261                                  * channel and HCI_AUTO_OFF grace period
1262                                  * is still active.
1263                                  */
1264                                 err = 0;
1265                         } else {
1266                                 hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
1267                                 mgmt_index_added(hdev);
1268                                 hci_dev_put(hdev);
1269                                 goto done;
1270                         }
1271                 }
1272
1273                 hci_pi(sk)->channel = haddr.hci_channel;
1274
1275                 if (!hci_sock_gen_cookie(sk)) {
1276                         /* In the case when a cookie has already been assigned,
1277                          * this socket will transition from a raw socket into
1278                          * a user channel socket. For a clean transition, send
1279                          * the close notification first.
1280                          */
1281                         skb = create_monitor_ctrl_close(sk);
1282                         if (skb) {
1283                                 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1284                                                     HCI_SOCK_TRUSTED, NULL);
1285                                 kfree_skb(skb);
1286                         }
1287                 }
1288
1289                 /* The user channel is restricted to CAP_NET_ADMIN
1290                  * capabilities and with that implicitly trusted.
1291                  */
1292                 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1293
1294                 hci_pi(sk)->hdev = hdev;
1295
1296                 /* Send event to monitor */
1297                 skb = create_monitor_ctrl_open(sk);
1298                 if (skb) {
1299                         hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1300                                             HCI_SOCK_TRUSTED, NULL);
1301                         kfree_skb(skb);
1302                 }
1303
1304                 atomic_inc(&hdev->promisc);
1305                 break;
1306
1307         case HCI_CHANNEL_MONITOR:
1308                 if (haddr.hci_dev != HCI_DEV_NONE) {
1309                         err = -EINVAL;
1310                         goto done;
1311                 }
1312
1313                 if (!capable(CAP_NET_RAW)) {
1314                         err = -EPERM;
1315                         goto done;
1316                 }
1317
1318                 hci_pi(sk)->channel = haddr.hci_channel;
1319
1320                 /* The monitor interface is restricted to CAP_NET_RAW
1321                  * capabilities and with that implicitly trusted.
1322                  */
1323                 hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1324
1325                 send_monitor_note(sk, "Linux version %s (%s)",
1326                                   init_utsname()->release,
1327                                   init_utsname()->machine);
1328                 send_monitor_note(sk, "Bluetooth subsystem version %u.%u",
1329                                   BT_SUBSYS_VERSION, BT_SUBSYS_REVISION);
1330                 send_monitor_replay(sk);
1331                 send_monitor_control_replay(sk);
1332
1333                 atomic_inc(&monitor_promisc);
1334                 break;
1335
1336         case HCI_CHANNEL_LOGGING:
1337                 if (haddr.hci_dev != HCI_DEV_NONE) {
1338                         err = -EINVAL;
1339                         goto done;
1340                 }
1341
1342                 if (!capable(CAP_NET_ADMIN)) {
1343                         err = -EPERM;
1344                         goto done;
1345                 }
1346
1347                 hci_pi(sk)->channel = haddr.hci_channel;
1348                 break;
1349
1350         default:
1351                 if (!hci_mgmt_chan_find(haddr.hci_channel)) {
1352                         err = -EINVAL;
1353                         goto done;
1354                 }
1355
1356                 if (haddr.hci_dev != HCI_DEV_NONE) {
1357                         err = -EINVAL;
1358                         goto done;
1359                 }
1360
1361                 /* Users with CAP_NET_ADMIN capabilities are allowed
1362                  * access to all management commands and events. For
1363                  * untrusted users the interface is restricted and
1364                  * also only untrusted events are sent.
1365                  */
1366                 if (capable(CAP_NET_ADMIN))
1367                         hci_sock_set_flag(sk, HCI_SOCK_TRUSTED);
1368
1369                 hci_pi(sk)->channel = haddr.hci_channel;
1370
1371                 /* At the moment the index and unconfigured index events
1372                  * are enabled unconditionally. Setting them on each
1373                  * socket when binding keeps this functionality. They
1374                  * however might be cleared later and then sending of these
1375                  * events will be disabled, but that is then intentional.
1376                  *
1377                  * This also enables generic events that are safe to be
1378                  * received by untrusted users. Example for such events
1379                  * are changes to settings, class of device, name etc.
1380                  */
1381                 if (hci_pi(sk)->channel == HCI_CHANNEL_CONTROL) {
1382                         if (!hci_sock_gen_cookie(sk)) {
1383                                 /* In the case when a cookie has already been
1384                                  * assigned, this socket will transition from
1385                                  * a raw socket into a control socket. To
1386                                  * allow for a clean transition, send the
1387                                  * close notification first.
1388                                  */
1389                                 skb = create_monitor_ctrl_close(sk);
1390                                 if (skb) {
1391                                         hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1392                                                             HCI_SOCK_TRUSTED, NULL);
1393                                         kfree_skb(skb);
1394                                 }
1395                         }
1396
1397                         /* Send event to monitor */
1398                         skb = create_monitor_ctrl_open(sk);
1399                         if (skb) {
1400                                 hci_send_to_channel(HCI_CHANNEL_MONITOR, skb,
1401                                                     HCI_SOCK_TRUSTED, NULL);
1402                                 kfree_skb(skb);
1403                         }
1404
1405                         hci_sock_set_flag(sk, HCI_MGMT_INDEX_EVENTS);
1406                         hci_sock_set_flag(sk, HCI_MGMT_UNCONF_INDEX_EVENTS);
1407                         hci_sock_set_flag(sk, HCI_MGMT_OPTION_EVENTS);
1408                         hci_sock_set_flag(sk, HCI_MGMT_SETTING_EVENTS);
1409                         hci_sock_set_flag(sk, HCI_MGMT_DEV_CLASS_EVENTS);
1410                         hci_sock_set_flag(sk, HCI_MGMT_LOCAL_NAME_EVENTS);
1411                 }
1412                 break;
1413         }
1414
1415         /* Default MTU to HCI_MAX_FRAME_SIZE if not set */
1416         if (!hci_pi(sk)->mtu)
1417                 hci_pi(sk)->mtu = HCI_MAX_FRAME_SIZE;
1418
1419         sk->sk_state = BT_BOUND;
1420
1421 done:
1422         release_sock(sk);
1423         return err;
1424 }
1425
1426 static int hci_sock_getname(struct socket *sock, struct sockaddr *addr,
1427                             int peer)
1428 {
1429         struct sockaddr_hci *haddr = (struct sockaddr_hci *)addr;
1430         struct sock *sk = sock->sk;
1431         struct hci_dev *hdev;
1432         int err = 0;
1433
1434         BT_DBG("sock %p sk %p", sock, sk);
1435
1436         if (peer)
1437                 return -EOPNOTSUPP;
1438
1439         lock_sock(sk);
1440
1441         hdev = hci_hdev_from_sock(sk);
1442         if (IS_ERR(hdev)) {
1443                 err = PTR_ERR(hdev);
1444                 goto done;
1445         }
1446
1447         haddr->hci_family = AF_BLUETOOTH;
1448         haddr->hci_dev    = hdev->id;
1449         haddr->hci_channel= hci_pi(sk)->channel;
1450         err = sizeof(*haddr);
1451
1452 done:
1453         release_sock(sk);
1454         return err;
1455 }
1456
1457 static void hci_sock_cmsg(struct sock *sk, struct msghdr *msg,
1458                           struct sk_buff *skb)
1459 {
1460         __u8 mask = hci_pi(sk)->cmsg_mask;
1461
1462         if (mask & HCI_CMSG_DIR) {
1463                 int incoming = bt_cb(skb)->incoming;
1464                 put_cmsg(msg, SOL_HCI, HCI_CMSG_DIR, sizeof(incoming),
1465                          &incoming);
1466         }
1467
1468         if (mask & HCI_CMSG_TSTAMP) {
1469 #ifdef CONFIG_COMPAT
1470                 struct old_timeval32 ctv;
1471 #endif
1472                 struct __kernel_old_timeval tv;
1473                 void *data;
1474                 int len;
1475
1476                 skb_get_timestamp(skb, &tv);
1477
1478                 data = &tv;
1479                 len = sizeof(tv);
1480 #ifdef CONFIG_COMPAT
1481                 if (!COMPAT_USE_64BIT_TIME &&
1482                     (msg->msg_flags & MSG_CMSG_COMPAT)) {
1483                         ctv.tv_sec = tv.tv_sec;
1484                         ctv.tv_usec = tv.tv_usec;
1485                         data = &ctv;
1486                         len = sizeof(ctv);
1487                 }
1488 #endif
1489
1490                 put_cmsg(msg, SOL_HCI, HCI_CMSG_TSTAMP, len, data);
1491         }
1492 }
1493
1494 static int hci_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1495                             size_t len, int flags)
1496 {
1497         struct sock *sk = sock->sk;
1498         struct sk_buff *skb;
1499         int copied, err;
1500         unsigned int skblen;
1501
1502         BT_DBG("sock %p, sk %p", sock, sk);
1503
1504         if (flags & MSG_OOB)
1505                 return -EOPNOTSUPP;
1506
1507         if (hci_pi(sk)->channel == HCI_CHANNEL_LOGGING)
1508                 return -EOPNOTSUPP;
1509
1510         if (sk->sk_state == BT_CLOSED)
1511                 return 0;
1512
1513         skb = skb_recv_datagram(sk, flags, &err);
1514         if (!skb)
1515                 return err;
1516
1517         skblen = skb->len;
1518         copied = skb->len;
1519         if (len < copied) {
1520                 msg->msg_flags |= MSG_TRUNC;
1521                 copied = len;
1522         }
1523
1524         skb_reset_transport_header(skb);
1525         err = skb_copy_datagram_msg(skb, 0, msg, copied);
1526
1527         switch (hci_pi(sk)->channel) {
1528         case HCI_CHANNEL_RAW:
1529                 hci_sock_cmsg(sk, msg, skb);
1530                 break;
1531         case HCI_CHANNEL_USER:
1532         case HCI_CHANNEL_MONITOR:
1533                 sock_recv_timestamp(msg, sk, skb);
1534                 break;
1535         default:
1536                 if (hci_mgmt_chan_find(hci_pi(sk)->channel))
1537                         sock_recv_timestamp(msg, sk, skb);
1538                 break;
1539         }
1540
1541         skb_free_datagram(sk, skb);
1542
1543         if (flags & MSG_TRUNC)
1544                 copied = skblen;
1545
1546         return err ? : copied;
1547 }
1548
1549 static int hci_mgmt_cmd(struct hci_mgmt_chan *chan, struct sock *sk,
1550                         struct sk_buff *skb)
1551 {
1552         u8 *cp;
1553         struct mgmt_hdr *hdr;
1554         u16 opcode, index, len;
1555         struct hci_dev *hdev = NULL;
1556         const struct hci_mgmt_handler *handler;
1557         bool var_len, no_hdev;
1558         int err;
1559
1560         BT_DBG("got %d bytes", skb->len);
1561
1562         if (skb->len < sizeof(*hdr))
1563                 return -EINVAL;
1564
1565         hdr = (void *)skb->data;
1566         opcode = __le16_to_cpu(hdr->opcode);
1567         index = __le16_to_cpu(hdr->index);
1568         len = __le16_to_cpu(hdr->len);
1569
1570         if (len != skb->len - sizeof(*hdr)) {
1571                 err = -EINVAL;
1572                 goto done;
1573         }
1574
1575         if (chan->channel == HCI_CHANNEL_CONTROL) {
1576                 struct sk_buff *cmd;
1577
1578                 /* Send event to monitor */
1579                 cmd = create_monitor_ctrl_command(sk, index, opcode, len,
1580                                                   skb->data + sizeof(*hdr));
1581                 if (cmd) {
1582                         hci_send_to_channel(HCI_CHANNEL_MONITOR, cmd,
1583                                             HCI_SOCK_TRUSTED, NULL);
1584                         kfree_skb(cmd);
1585                 }
1586         }
1587
1588         if (opcode >= chan->handler_count ||
1589             chan->handlers[opcode].func == NULL) {
1590                 BT_DBG("Unknown op %u", opcode);
1591                 err = mgmt_cmd_status(sk, index, opcode,
1592                                       MGMT_STATUS_UNKNOWN_COMMAND);
1593                 goto done;
1594         }
1595
1596         handler = &chan->handlers[opcode];
1597
1598         if (!hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) &&
1599             !(handler->flags & HCI_MGMT_UNTRUSTED)) {
1600                 err = mgmt_cmd_status(sk, index, opcode,
1601                                       MGMT_STATUS_PERMISSION_DENIED);
1602                 goto done;
1603         }
1604
1605         if (index != MGMT_INDEX_NONE) {
1606                 hdev = hci_dev_get(index);
1607                 if (!hdev) {
1608                         err = mgmt_cmd_status(sk, index, opcode,
1609                                               MGMT_STATUS_INVALID_INDEX);
1610                         goto done;
1611                 }
1612
1613                 if (hci_dev_test_flag(hdev, HCI_SETUP) ||
1614                     hci_dev_test_flag(hdev, HCI_CONFIG) ||
1615                     hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1616                         err = mgmt_cmd_status(sk, index, opcode,
1617                                               MGMT_STATUS_INVALID_INDEX);
1618                         goto done;
1619                 }
1620
1621                 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
1622                     !(handler->flags & HCI_MGMT_UNCONFIGURED)) {
1623                         err = mgmt_cmd_status(sk, index, opcode,
1624                                               MGMT_STATUS_INVALID_INDEX);
1625                         goto done;
1626                 }
1627         }
1628
1629         if (!(handler->flags & HCI_MGMT_HDEV_OPTIONAL)) {
1630                 no_hdev = (handler->flags & HCI_MGMT_NO_HDEV);
1631                 if (no_hdev != !hdev) {
1632                         err = mgmt_cmd_status(sk, index, opcode,
1633                                               MGMT_STATUS_INVALID_INDEX);
1634                         goto done;
1635                 }
1636         }
1637
1638         var_len = (handler->flags & HCI_MGMT_VAR_LEN);
1639         if ((var_len && len < handler->data_len) ||
1640             (!var_len && len != handler->data_len)) {
1641                 err = mgmt_cmd_status(sk, index, opcode,
1642                                       MGMT_STATUS_INVALID_PARAMS);
1643                 goto done;
1644         }
1645
1646         if (hdev && chan->hdev_init)
1647                 chan->hdev_init(sk, hdev);
1648
1649         cp = skb->data + sizeof(*hdr);
1650
1651         err = handler->func(sk, hdev, cp, len);
1652         if (err < 0)
1653                 goto done;
1654
1655         err = skb->len;
1656
1657 done:
1658         if (hdev)
1659                 hci_dev_put(hdev);
1660
1661         return err;
1662 }
1663
1664 static int hci_logging_frame(struct sock *sk, struct sk_buff *skb,
1665                              unsigned int flags)
1666 {
1667         struct hci_mon_hdr *hdr;
1668         struct hci_dev *hdev;
1669         u16 index;
1670         int err;
1671
1672         /* The logging frame consists at minimum of the standard header,
1673          * the priority byte, the ident length byte and at least one string
1674          * terminator NUL byte. Anything shorter are invalid packets.
1675          */
1676         if (skb->len < sizeof(*hdr) + 3)
1677                 return -EINVAL;
1678
1679         hdr = (void *)skb->data;
1680
1681         if (__le16_to_cpu(hdr->len) != skb->len - sizeof(*hdr))
1682                 return -EINVAL;
1683
1684         if (__le16_to_cpu(hdr->opcode) == 0x0000) {
1685                 __u8 priority = skb->data[sizeof(*hdr)];
1686                 __u8 ident_len = skb->data[sizeof(*hdr) + 1];
1687
1688                 /* Only the priorities 0-7 are valid and with that any other
1689                  * value results in an invalid packet.
1690                  *
1691                  * The priority byte is followed by an ident length byte and
1692                  * the NUL terminated ident string. Check that the ident
1693                  * length is not overflowing the packet and also that the
1694                  * ident string itself is NUL terminated. In case the ident
1695                  * length is zero, the length value actually doubles as NUL
1696                  * terminator identifier.
1697                  *
1698                  * The message follows the ident string (if present) and
1699                  * must be NUL terminated. Otherwise it is not a valid packet.
1700                  */
1701                 if (priority > 7 || skb->data[skb->len - 1] != 0x00 ||
1702                     ident_len > skb->len - sizeof(*hdr) - 3 ||
1703                     skb->data[sizeof(*hdr) + ident_len + 1] != 0x00)
1704                         return -EINVAL;
1705         } else {
1706                 return -EINVAL;
1707         }
1708
1709         index = __le16_to_cpu(hdr->index);
1710
1711         if (index != MGMT_INDEX_NONE) {
1712                 hdev = hci_dev_get(index);
1713                 if (!hdev)
1714                         return -ENODEV;
1715         } else {
1716                 hdev = NULL;
1717         }
1718
1719         hdr->opcode = cpu_to_le16(HCI_MON_USER_LOGGING);
1720
1721         hci_send_to_channel(HCI_CHANNEL_MONITOR, skb, HCI_SOCK_TRUSTED, NULL);
1722         err = skb->len;
1723
1724         if (hdev)
1725                 hci_dev_put(hdev);
1726
1727         return err;
1728 }
1729
1730 static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1731                             size_t len)
1732 {
1733         struct sock *sk = sock->sk;
1734         struct hci_mgmt_chan *chan;
1735         struct hci_dev *hdev;
1736         struct sk_buff *skb;
1737         int err;
1738         const unsigned int flags = msg->msg_flags;
1739
1740         BT_DBG("sock %p sk %p", sock, sk);
1741
1742         if (flags & MSG_OOB)
1743                 return -EOPNOTSUPP;
1744
1745         if (flags & ~(MSG_DONTWAIT | MSG_NOSIGNAL | MSG_ERRQUEUE | MSG_CMSG_COMPAT))
1746                 return -EINVAL;
1747
1748         if (len < 4 || len > hci_pi(sk)->mtu)
1749                 return -EINVAL;
1750
1751         skb = bt_skb_sendmsg(sk, msg, len, len, 0, 0);
1752         if (IS_ERR(skb))
1753                 return PTR_ERR(skb);
1754
1755         lock_sock(sk);
1756
1757         switch (hci_pi(sk)->channel) {
1758         case HCI_CHANNEL_RAW:
1759         case HCI_CHANNEL_USER:
1760                 break;
1761         case HCI_CHANNEL_MONITOR:
1762                 err = -EOPNOTSUPP;
1763                 goto drop;
1764         case HCI_CHANNEL_LOGGING:
1765                 err = hci_logging_frame(sk, skb, flags);
1766                 goto drop;
1767         default:
1768                 mutex_lock(&mgmt_chan_list_lock);
1769                 chan = __hci_mgmt_chan_find(hci_pi(sk)->channel);
1770                 if (chan)
1771                         err = hci_mgmt_cmd(chan, sk, skb);
1772                 else
1773                         err = -EINVAL;
1774
1775                 mutex_unlock(&mgmt_chan_list_lock);
1776                 goto drop;
1777         }
1778
1779         hdev = hci_hdev_from_sock(sk);
1780         if (IS_ERR(hdev)) {
1781                 err = PTR_ERR(hdev);
1782                 goto drop;
1783         }
1784
1785         if (!test_bit(HCI_UP, &hdev->flags)) {
1786                 err = -ENETDOWN;
1787                 goto drop;
1788         }
1789
1790         hci_skb_pkt_type(skb) = skb->data[0];
1791         skb_pull(skb, 1);
1792
1793         if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
1794                 /* No permission check is needed for user channel
1795                  * since that gets enforced when binding the socket.
1796                  *
1797                  * However check that the packet type is valid.
1798                  */
1799                 if (hci_skb_pkt_type(skb) != HCI_COMMAND_PKT &&
1800                     hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1801                     hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
1802                     hci_skb_pkt_type(skb) != HCI_ISODATA_PKT) {
1803                         err = -EINVAL;
1804                         goto drop;
1805                 }
1806
1807                 skb_queue_tail(&hdev->raw_q, skb);
1808                 queue_work(hdev->workqueue, &hdev->tx_work);
1809         } else if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) {
1810                 u16 opcode = get_unaligned_le16(skb->data);
1811                 u16 ogf = hci_opcode_ogf(opcode);
1812                 u16 ocf = hci_opcode_ocf(opcode);
1813
1814                 if (((ogf > HCI_SFLT_MAX_OGF) ||
1815                      !hci_test_bit(ocf & HCI_FLT_OCF_BITS,
1816                                    &hci_sec_filter.ocf_mask[ogf])) &&
1817                     !capable(CAP_NET_RAW)) {
1818                         err = -EPERM;
1819                         goto drop;
1820                 }
1821
1822                 /* Since the opcode has already been extracted here, store
1823                  * a copy of the value for later use by the drivers.
1824                  */
1825                 hci_skb_opcode(skb) = opcode;
1826
1827                 if (ogf == 0x3f) {
1828                         skb_queue_tail(&hdev->raw_q, skb);
1829                         queue_work(hdev->workqueue, &hdev->tx_work);
1830                 } else {
1831                         /* Stand-alone HCI commands must be flagged as
1832                          * single-command requests.
1833                          */
1834                         bt_cb(skb)->hci.req_flags |= HCI_REQ_START;
1835
1836                         skb_queue_tail(&hdev->cmd_q, skb);
1837                         queue_work(hdev->workqueue, &hdev->cmd_work);
1838                 }
1839         } else {
1840                 if (!capable(CAP_NET_RAW)) {
1841                         err = -EPERM;
1842                         goto drop;
1843                 }
1844
1845                 if (hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
1846                     hci_skb_pkt_type(skb) != HCI_SCODATA_PKT &&
1847                     hci_skb_pkt_type(skb) != HCI_ISODATA_PKT) {
1848                         err = -EINVAL;
1849                         goto drop;
1850                 }
1851
1852                 skb_queue_tail(&hdev->raw_q, skb);
1853                 queue_work(hdev->workqueue, &hdev->tx_work);
1854         }
1855
1856         err = len;
1857
1858 done:
1859         release_sock(sk);
1860         return err;
1861
1862 drop:
1863         kfree_skb(skb);
1864         goto done;
1865 }
1866
1867 static int hci_sock_setsockopt_old(struct socket *sock, int level, int optname,
1868                                    sockptr_t optval, unsigned int len)
1869 {
1870         struct hci_ufilter uf = { .opcode = 0 };
1871         struct sock *sk = sock->sk;
1872         int err = 0, opt = 0;
1873
1874         BT_DBG("sk %p, opt %d", sk, optname);
1875
1876         lock_sock(sk);
1877
1878         if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
1879                 err = -EBADFD;
1880                 goto done;
1881         }
1882
1883         switch (optname) {
1884         case HCI_DATA_DIR:
1885                 if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
1886                         err = -EFAULT;
1887                         break;
1888                 }
1889
1890                 if (opt)
1891                         hci_pi(sk)->cmsg_mask |= HCI_CMSG_DIR;
1892                 else
1893                         hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_DIR;
1894                 break;
1895
1896         case HCI_TIME_STAMP:
1897                 if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
1898                         err = -EFAULT;
1899                         break;
1900                 }
1901
1902                 if (opt)
1903                         hci_pi(sk)->cmsg_mask |= HCI_CMSG_TSTAMP;
1904                 else
1905                         hci_pi(sk)->cmsg_mask &= ~HCI_CMSG_TSTAMP;
1906                 break;
1907
1908         case HCI_FILTER:
1909                 {
1910                         struct hci_filter *f = &hci_pi(sk)->filter;
1911
1912                         uf.type_mask = f->type_mask;
1913                         uf.opcode    = f->opcode;
1914                         uf.event_mask[0] = *((u32 *) f->event_mask + 0);
1915                         uf.event_mask[1] = *((u32 *) f->event_mask + 1);
1916                 }
1917
1918                 len = min_t(unsigned int, len, sizeof(uf));
1919                 if (copy_from_sockptr(&uf, optval, len)) {
1920                         err = -EFAULT;
1921                         break;
1922                 }
1923
1924                 if (!capable(CAP_NET_RAW)) {
1925                         uf.type_mask &= hci_sec_filter.type_mask;
1926                         uf.event_mask[0] &= *((u32 *) hci_sec_filter.event_mask + 0);
1927                         uf.event_mask[1] &= *((u32 *) hci_sec_filter.event_mask + 1);
1928                 }
1929
1930                 {
1931                         struct hci_filter *f = &hci_pi(sk)->filter;
1932
1933                         f->type_mask = uf.type_mask;
1934                         f->opcode    = uf.opcode;
1935                         *((u32 *) f->event_mask + 0) = uf.event_mask[0];
1936                         *((u32 *) f->event_mask + 1) = uf.event_mask[1];
1937                 }
1938                 break;
1939
1940         default:
1941                 err = -ENOPROTOOPT;
1942                 break;
1943         }
1944
1945 done:
1946         release_sock(sk);
1947         return err;
1948 }
1949
1950 static int hci_sock_setsockopt(struct socket *sock, int level, int optname,
1951                                sockptr_t optval, unsigned int len)
1952 {
1953         struct sock *sk = sock->sk;
1954         int err = 0;
1955         u16 opt;
1956
1957         BT_DBG("sk %p, opt %d", sk, optname);
1958
1959         if (level == SOL_HCI)
1960                 return hci_sock_setsockopt_old(sock, level, optname, optval,
1961                                                len);
1962
1963         if (level != SOL_BLUETOOTH)
1964                 return -ENOPROTOOPT;
1965
1966         lock_sock(sk);
1967
1968         switch (optname) {
1969         case BT_SNDMTU:
1970         case BT_RCVMTU:
1971                 switch (hci_pi(sk)->channel) {
1972                 /* Don't allow changing MTU for channels that are meant for HCI
1973                  * traffic only.
1974                  */
1975                 case HCI_CHANNEL_RAW:
1976                 case HCI_CHANNEL_USER:
1977                         err = -ENOPROTOOPT;
1978                         goto done;
1979                 }
1980
1981                 if (copy_from_sockptr(&opt, optval, sizeof(opt))) {
1982                         err = -EFAULT;
1983                         break;
1984                 }
1985
1986                 hci_pi(sk)->mtu = opt;
1987                 break;
1988
1989         default:
1990                 err = -ENOPROTOOPT;
1991                 break;
1992         }
1993
1994 done:
1995         release_sock(sk);
1996         return err;
1997 }
1998
1999 static int hci_sock_getsockopt_old(struct socket *sock, int level, int optname,
2000                                    char __user *optval, int __user *optlen)
2001 {
2002         struct hci_ufilter uf;
2003         struct sock *sk = sock->sk;
2004         int len, opt, err = 0;
2005
2006         BT_DBG("sk %p, opt %d", sk, optname);
2007
2008         if (get_user(len, optlen))
2009                 return -EFAULT;
2010
2011         lock_sock(sk);
2012
2013         if (hci_pi(sk)->channel != HCI_CHANNEL_RAW) {
2014                 err = -EBADFD;
2015                 goto done;
2016         }
2017
2018         switch (optname) {
2019         case HCI_DATA_DIR:
2020                 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_DIR)
2021                         opt = 1;
2022                 else
2023                         opt = 0;
2024
2025                 if (put_user(opt, optval))
2026                         err = -EFAULT;
2027                 break;
2028
2029         case HCI_TIME_STAMP:
2030                 if (hci_pi(sk)->cmsg_mask & HCI_CMSG_TSTAMP)
2031                         opt = 1;
2032                 else
2033                         opt = 0;
2034
2035                 if (put_user(opt, optval))
2036                         err = -EFAULT;
2037                 break;
2038
2039         case HCI_FILTER:
2040                 {
2041                         struct hci_filter *f = &hci_pi(sk)->filter;
2042
2043                         memset(&uf, 0, sizeof(uf));
2044                         uf.type_mask = f->type_mask;
2045                         uf.opcode    = f->opcode;
2046                         uf.event_mask[0] = *((u32 *) f->event_mask + 0);
2047                         uf.event_mask[1] = *((u32 *) f->event_mask + 1);
2048                 }
2049
2050                 len = min_t(unsigned int, len, sizeof(uf));
2051                 if (copy_to_user(optval, &uf, len))
2052                         err = -EFAULT;
2053                 break;
2054
2055         default:
2056                 err = -ENOPROTOOPT;
2057                 break;
2058         }
2059
2060 done:
2061         release_sock(sk);
2062         return err;
2063 }
2064
2065 static int hci_sock_getsockopt(struct socket *sock, int level, int optname,
2066                                char __user *optval, int __user *optlen)
2067 {
2068         struct sock *sk = sock->sk;
2069         int err = 0;
2070
2071         BT_DBG("sk %p, opt %d", sk, optname);
2072
2073         if (level == SOL_HCI)
2074                 return hci_sock_getsockopt_old(sock, level, optname, optval,
2075                                                optlen);
2076
2077         if (level != SOL_BLUETOOTH)
2078                 return -ENOPROTOOPT;
2079
2080         lock_sock(sk);
2081
2082         switch (optname) {
2083         case BT_SNDMTU:
2084         case BT_RCVMTU:
2085                 if (put_user(hci_pi(sk)->mtu, (u16 __user *)optval))
2086                         err = -EFAULT;
2087                 break;
2088
2089         default:
2090                 err = -ENOPROTOOPT;
2091                 break;
2092         }
2093
2094         release_sock(sk);
2095         return err;
2096 }
2097
2098 static void hci_sock_destruct(struct sock *sk)
2099 {
2100         mgmt_cleanup(sk);
2101         skb_queue_purge(&sk->sk_receive_queue);
2102         skb_queue_purge(&sk->sk_write_queue);
2103 }
2104
2105 static const struct proto_ops hci_sock_ops = {
2106         .family         = PF_BLUETOOTH,
2107         .owner          = THIS_MODULE,
2108         .release        = hci_sock_release,
2109         .bind           = hci_sock_bind,
2110         .getname        = hci_sock_getname,
2111         .sendmsg        = hci_sock_sendmsg,
2112         .recvmsg        = hci_sock_recvmsg,
2113         .ioctl          = hci_sock_ioctl,
2114 #ifdef CONFIG_COMPAT
2115         .compat_ioctl   = hci_sock_compat_ioctl,
2116 #endif
2117         .poll           = datagram_poll,
2118         .listen         = sock_no_listen,
2119         .shutdown       = sock_no_shutdown,
2120         .setsockopt     = hci_sock_setsockopt,
2121         .getsockopt     = hci_sock_getsockopt,
2122         .connect        = sock_no_connect,
2123         .socketpair     = sock_no_socketpair,
2124         .accept         = sock_no_accept,
2125         .mmap           = sock_no_mmap
2126 };
2127
2128 static struct proto hci_sk_proto = {
2129         .name           = "HCI",
2130         .owner          = THIS_MODULE,
2131         .obj_size       = sizeof(struct hci_pinfo)
2132 };
2133
2134 static int hci_sock_create(struct net *net, struct socket *sock, int protocol,
2135                            int kern)
2136 {
2137         struct sock *sk;
2138
2139         BT_DBG("sock %p", sock);
2140
2141         if (sock->type != SOCK_RAW)
2142                 return -ESOCKTNOSUPPORT;
2143
2144         sock->ops = &hci_sock_ops;
2145
2146         sk = sk_alloc(net, PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto, kern);
2147         if (!sk)
2148                 return -ENOMEM;
2149
2150         sock_init_data(sock, sk);
2151
2152         sock_reset_flag(sk, SOCK_ZAPPED);
2153
2154         sk->sk_protocol = protocol;
2155
2156         sock->state = SS_UNCONNECTED;
2157         sk->sk_state = BT_OPEN;
2158         sk->sk_destruct = hci_sock_destruct;
2159
2160         bt_sock_link(&hci_sk_list, sk);
2161         return 0;
2162 }
2163
2164 static const struct net_proto_family hci_sock_family_ops = {
2165         .family = PF_BLUETOOTH,
2166         .owner  = THIS_MODULE,
2167         .create = hci_sock_create,
2168 };
2169
2170 int __init hci_sock_init(void)
2171 {
2172         int err;
2173
2174         BUILD_BUG_ON(sizeof(struct sockaddr_hci) > sizeof(struct sockaddr));
2175
2176         err = proto_register(&hci_sk_proto, 0);
2177         if (err < 0)
2178                 return err;
2179
2180         err = bt_sock_register(BTPROTO_HCI, &hci_sock_family_ops);
2181         if (err < 0) {
2182                 BT_ERR("HCI socket registration failed");
2183                 goto error;
2184         }
2185
2186         err = bt_procfs_init(&init_net, "hci", &hci_sk_list, NULL);
2187         if (err < 0) {
2188                 BT_ERR("Failed to create HCI proc file");
2189                 bt_sock_unregister(BTPROTO_HCI);
2190                 goto error;
2191         }
2192
2193         BT_INFO("HCI socket layer initialized");
2194
2195         return 0;
2196
2197 error:
2198         proto_unregister(&hci_sk_proto);
2199         return err;
2200 }
2201
2202 void hci_sock_cleanup(void)
2203 {
2204         bt_procfs_cleanup(&init_net, "hci");
2205         bt_sock_unregister(BTPROTO_HCI);
2206         proto_unregister(&hci_sk_proto);
2207 }