net/bluetooth/hci_core.c

   1 /*
   2    BlueZ - Bluetooth protocol stack for Linux
   3    Copyright (C) 2000-2001 Qualcomm Incorporated
   4    Copyright (C) 2011 ProFUSION Embedded Systems
   5
   6    Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License version 2 as
  10    published by the Free Software Foundation;
  11
  12    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  13    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  14    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  15    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  16    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  17    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  19    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20
  21    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  22    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  23    SOFTWARE IS DISCLAIMED.
  24 */
  25
  26 /* Bluetooth HCI core. */
  27
  28 #include <linux/export.h>
  29 #include <linux/idr.h>
  30 #include <linux/rfkill.h>
  31 #include <linux/debugfs.h>
  32 #include <linux/crypto.h>
  33 #include <linux/property.h>
  34 #include <asm/unaligned.h>
  35
  36 #include <net/bluetooth/bluetooth.h>
  37 #include <net/bluetooth/hci_core.h>
  38 #include <net/bluetooth/l2cap.h>
  39 #include <net/bluetooth/mgmt.h>
  40
  41 #include "hci_request.h"
  42 #include "hci_debugfs.h"
  43 #include "smp.h"
  44 #include "leds.h"
  45
  46 static void hci_rx_work(struct work_struct *work);
  47 static void hci_cmd_work(struct work_struct *work);
  48 static void hci_tx_work(struct work_struct *work);
  49
  50 /* HCI device list */
  51 LIST_HEAD(hci_dev_list);
  52 DEFINE_RWLOCK(hci_dev_list_lock);
  53
  54 /* HCI callback list */
  55 LIST_HEAD(hci_cb_list);
  56 DEFINE_MUTEX(hci_cb_list_lock);
  57
  58 /* HCI ID Numbering */
  59 static DEFINE_IDA(hci_index_ida);
  60
  61 /* ---- HCI debugfs entries ---- */
  62
  63 static ssize_t dut_mode_read(struct file *file, char __user *user_buf,
  64                              size_t count, loff_t *ppos)
  65 {
  66         struct hci_dev *hdev = file->private_data;
  67         char buf[3];
  68
  69         buf[0] = hci_dev_test_flag(hdev, HCI_DUT_MODE) ? 'Y' : 'N';
  70         buf[1] = '\n';
  71         buf[2] = '\0';
  72         return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
  73 }
  74
  75 static ssize_t dut_mode_write(struct file *file, const char __user *user_buf,
  76                               size_t count, loff_t *ppos)
  77 {
  78         struct hci_dev *hdev = file->private_data;
  79         struct sk_buff *skb;
  80         bool enable;
  81         int err;
  82
  83         if (!test_bit(HCI_UP, &hdev->flags))
  84                 return -ENETDOWN;
  85
  86         err = kstrtobool_from_user(user_buf, count, &enable);
  87         if (err)
  88                 return err;
  89
  90         if (enable == hci_dev_test_flag(hdev, HCI_DUT_MODE))
  91                 return -EALREADY;
  92
  93         hci_req_sync_lock(hdev);
  94         if (enable)
  95                 skb = __hci_cmd_sync(hdev, HCI_OP_ENABLE_DUT_MODE, 0, NULL,
  96                                      HCI_CMD_TIMEOUT);
  97         else
  98                 skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL,
  99                                      HCI_CMD_TIMEOUT);
 100         hci_req_sync_unlock(hdev);
 101
 102         if (IS_ERR(skb))
 103                 return PTR_ERR(skb);
 104
 105         kfree_skb(skb);
 106
 107         hci_dev_change_flag(hdev, HCI_DUT_MODE);
 108
 109         return count;
 110 }
 111
 112 static const struct file_operations dut_mode_fops = {
 113         .open           = simple_open,
 114         .read           = dut_mode_read,
 115         .write          = dut_mode_write,
 116         .llseek         = default_llseek,
 117 };
 118
 119 static ssize_t vendor_diag_read(struct file *file, char __user *user_buf,
 120                                 size_t count, loff_t *ppos)
 121 {
 122         struct hci_dev *hdev = file->private_data;
 123         char buf[3];
 124
 125         buf[0] = hci_dev_test_flag(hdev, HCI_VENDOR_DIAG) ? 'Y' : 'N';
 126         buf[1] = '\n';
 127         buf[2] = '\0';
 128         return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
 129 }
 130
 131 static ssize_t vendor_diag_write(struct file *file, const char __user *user_buf,
 132                                  size_t count, loff_t *ppos)
 133 {
 134         struct hci_dev *hdev = file->private_data;
 135         bool enable;
 136         int err;
 137
 138         err = kstrtobool_from_user(user_buf, count, &enable);
 139         if (err)
 140                 return err;
 141
 142         /* When the diagnostic flags are not persistent and the transport
 143          * is not active or in user channel operation, then there is no need
 144          * for the vendor callback. Instead just store the desired value and
 145          * the setting will be programmed when the controller gets powered on.
 146          */
 147         if (test_bit(HCI_QUIRK_NON_PERSISTENT_DIAG, &hdev->quirks) &&
 148             (!test_bit(HCI_RUNNING, &hdev->flags) ||
 149              hci_dev_test_flag(hdev, HCI_USER_CHANNEL)))
 150                 goto done;
 151
 152         hci_req_sync_lock(hdev);
 153         err = hdev->set_diag(hdev, enable);
 154         hci_req_sync_unlock(hdev);
 155
 156         if (err < 0)
 157                 return err;
 158
 159 done:
 160         if (enable)
 161                 hci_dev_set_flag(hdev, HCI_VENDOR_DIAG);
 162         else
 163                 hci_dev_clear_flag(hdev, HCI_VENDOR_DIAG);
 164
 165         return count;
 166 }
 167
 168 static const struct file_operations vendor_diag_fops = {
 169         .open           = simple_open,
 170         .read           = vendor_diag_read,
 171         .write          = vendor_diag_write,
 172         .llseek         = default_llseek,
 173 };
 174
 175 static void hci_debugfs_create_basic(struct hci_dev *hdev)
 176 {
 177         debugfs_create_file("dut_mode", 0644, hdev->debugfs, hdev,
 178                             &dut_mode_fops);
 179
 180         if (hdev->set_diag)
 181                 debugfs_create_file("vendor_diag", 0644, hdev->debugfs, hdev,
 182                                     &vendor_diag_fops);
 183 }
 184
 185 static int hci_reset_req(struct hci_request *req, unsigned long opt)
 186 {
 187         BT_DBG("%s %ld", req->hdev->name, opt);
 188
 189         /* Reset device */
 190         set_bit(HCI_RESET, &req->hdev->flags);
 191         hci_req_add(req, HCI_OP_RESET, 0, NULL);
 192         return 0;
 193 }
 194
 195 static void bredr_init(struct hci_request *req)
 196 {
 197         req->hdev->flow_ctl_mode = HCI_FLOW_CTL_MODE_PACKET_BASED;
 198
 199         /* Read Local Supported Features */
 200         hci_req_add(req, HCI_OP_READ_LOCAL_FEATURES, 0, NULL);
 201
 202         /* Read Local Version */
 203         hci_req_add(req, HCI_OP_READ_LOCAL_VERSION, 0, NULL);
 204
 205         /* Read BD Address */
 206         hci_req_add(req, HCI_OP_READ_BD_ADDR, 0, NULL);
 207 }
 208
 209 static void amp_init1(struct hci_request *req)
 210 {
 211         req->hdev->flow_ctl_mode = HCI_FLOW_CTL_MODE_BLOCK_BASED;
 212
 213         /* Read Local Version */
 214         hci_req_add(req, HCI_OP_READ_LOCAL_VERSION, 0, NULL);
 215
 216         /* Read Local Supported Commands */
 217         hci_req_add(req, HCI_OP_READ_LOCAL_COMMANDS, 0, NULL);
 218
 219         /* Read Local AMP Info */
 220         hci_req_add(req, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
 221
 222         /* Read Data Blk size */
 223         hci_req_add(req, HCI_OP_READ_DATA_BLOCK_SIZE, 0, NULL);
 224
 225         /* Read Flow Control Mode */
 226         hci_req_add(req, HCI_OP_READ_FLOW_CONTROL_MODE, 0, NULL);
 227
 228         /* Read Location Data */
 229         hci_req_add(req, HCI_OP_READ_LOCATION_DATA, 0, NULL);
 230 }
 231
 232 static int amp_init2(struct hci_request *req)
 233 {
 234         /* Read Local Supported Features. Not all AMP controllers
 235          * support this so it's placed conditionally in the second
 236          * stage init.
 237          */
 238         if (req->hdev->commands[14] & 0x20)
 239                 hci_req_add(req, HCI_OP_READ_LOCAL_FEATURES, 0, NULL);
 240
 241         return 0;
 242 }
 243
 244 static int hci_init1_req(struct hci_request *req, unsigned long opt)
 245 {
 246         struct hci_dev *hdev = req->hdev;
 247
 248         BT_DBG("%s %ld", hdev->name, opt);
 249
 250         /* Reset */
 251         if (!test_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks))
 252                 hci_reset_req(req, 0);
 253
 254         switch (hdev->dev_type) {
 255         case HCI_PRIMARY:
 256                 bredr_init(req);
 257                 break;
 258         case HCI_AMP:
 259                 amp_init1(req);
 260                 break;
 261         default:
 262                 bt_dev_err(hdev, "Unknown device type %d", hdev->dev_type);
 263                 break;
 264         }
 265
 266         return 0;
 267 }
 268
 269 static void bredr_setup(struct hci_request *req)
 270 {
 271         __le16 param;
 272         __u8 flt_type;
 273
 274         /* Read Buffer Size (ACL mtu, max pkt, etc.) */
 275         hci_req_add(req, HCI_OP_READ_BUFFER_SIZE, 0, NULL);
 276
 277         /* Read Class of Device */
 278         hci_req_add(req, HCI_OP_READ_CLASS_OF_DEV, 0, NULL);
 279
 280         /* Read Local Name */
 281         hci_req_add(req, HCI_OP_READ_LOCAL_NAME, 0, NULL);
 282
 283         /* Read Voice Setting */
 284         hci_req_add(req, HCI_OP_READ_VOICE_SETTING, 0, NULL);
 285
 286         /* Read Number of Supported IAC */
 287         hci_req_add(req, HCI_OP_READ_NUM_SUPPORTED_IAC, 0, NULL);
 288
 289         /* Read Current IAC LAP */
 290         hci_req_add(req, HCI_OP_READ_CURRENT_IAC_LAP, 0, NULL);
 291
 292         /* Clear Event Filters */
 293         flt_type = HCI_FLT_CLEAR_ALL;
 294         hci_req_add(req, HCI_OP_SET_EVENT_FLT, 1, &flt_type);
 295
 296         /* Connection accept timeout ~20 secs */
 297         param = cpu_to_le16(0x7d00);
 298         hci_req_add(req, HCI_OP_WRITE_CA_TIMEOUT, 2, &param);
 299 }
 300
 301 static void le_setup(struct hci_request *req)
 302 {
 303         struct hci_dev *hdev = req->hdev;
 304
 305         /* Read LE Buffer Size */
 306         hci_req_add(req, HCI_OP_LE_READ_BUFFER_SIZE, 0, NULL);
 307
 308         /* Read LE Local Supported Features */
 309         hci_req_add(req, HCI_OP_LE_READ_LOCAL_FEATURES, 0, NULL);
 310
 311         /* Read LE Supported States */
 312         hci_req_add(req, HCI_OP_LE_READ_SUPPORTED_STATES, 0, NULL);
 313
 314         /* LE-only controllers have LE implicitly enabled */
 315         if (!lmp_bredr_capable(hdev))
 316                 hci_dev_set_flag(hdev, HCI_LE_ENABLED);
 317 }
 318
 319 static void hci_setup_event_mask(struct hci_request *req)
 320 {
 321         struct hci_dev *hdev = req->hdev;
 322
 323         /* The second byte is 0xff instead of 0x9f (two reserved bits
 324          * disabled) since a Broadcom 1.2 dongle doesn't respond to the
 325          * command otherwise.
 326          */
 327         u8 events[8] = { 0xff, 0xff, 0xfb, 0xff, 0x00, 0x00, 0x00, 0x00 };
 328
 329         /* CSR 1.1 dongles does not accept any bitfield so don't try to set
 330          * any event mask for pre 1.2 devices.
 331          */
 332         if (hdev->hci_ver < BLUETOOTH_VER_1_2)
 333                 return;
 334
 335         if (lmp_bredr_capable(hdev)) {
 336                 events[4] |= 0x01; /* Flow Specification Complete */
 337         } else {
 338                 /* Use a different default for LE-only devices */
 339                 memset(events, 0, sizeof(events));
 340                 events[1] |= 0x20; /* Command Complete */
 341                 events[1] |= 0x40; /* Command Status */
 342                 events[1] |= 0x80; /* Hardware Error */
 343
 344                 /* If the controller supports the Disconnect command, enable
 345                  * the corresponding event. In addition enable packet flow
 346                  * control related events.
 347                  */
 348                 if (hdev->commands[0] & 0x20) {
 349                         events[0] |= 0x10; /* Disconnection Complete */
 350                         events[2] |= 0x04; /* Number of Completed Packets */
 351                         events[3] |= 0x02; /* Data Buffer Overflow */
 352                 }
 353
 354                 /* If the controller supports the Read Remote Version
 355                  * Information command, enable the corresponding event.
 356                  */
 357                 if (hdev->commands[2] & 0x80)
 358                         events[1] |= 0x08; /* Read Remote Version Information
 359                                             * Complete
 360                                             */
 361
 362                 if (hdev->le_features[0] & HCI_LE_ENCRYPTION) {
 363                         events[0] |= 0x80; /* Encryption Change */
 364                         events[5] |= 0x80; /* Encryption Key Refresh Complete */
 365                 }
 366         }
 367
 368         if (lmp_inq_rssi_capable(hdev) ||
 369             test_bit(HCI_QUIRK_FIXUP_INQUIRY_MODE, &hdev->quirks))
 370                 events[4] |= 0x02; /* Inquiry Result with RSSI */
 371
 372         if (lmp_ext_feat_capable(hdev))
 373                 events[4] |= 0x04; /* Read Remote Extended Features Complete */
 374
 375         if (lmp_esco_capable(hdev)) {
 376                 events[5] |= 0x08; /* Synchronous Connection Complete */
 377                 events[5] |= 0x10; /* Synchronous Connection Changed */
 378         }
 379
 380         if (lmp_sniffsubr_capable(hdev))
 381                 events[5] |= 0x20; /* Sniff Subrating */
 382
 383         if (lmp_pause_enc_capable(hdev))
 384                 events[5] |= 0x80; /* Encryption Key Refresh Complete */
 385
 386         if (lmp_ext_inq_capable(hdev))
 387                 events[5] |= 0x40; /* Extended Inquiry Result */
 388
 389         if (lmp_no_flush_capable(hdev))
 390                 events[7] |= 0x01; /* Enhanced Flush Complete */
 391
 392         if (lmp_lsto_capable(hdev))
 393                 events[6] |= 0x80; /* Link Supervision Timeout Changed */
 394
 395         if (lmp_ssp_capable(hdev)) {
 396                 events[6] |= 0x01;      /* IO Capability Request */
 397                 events[6] |= 0x02;      /* IO Capability Response */
 398                 events[6] |= 0x04;      /* User Confirmation Request */
 399                 events[6] |= 0x08;      /* User Passkey Request */
 400                 events[6] |= 0x10;      /* Remote OOB Data Request */
 401                 events[6] |= 0x20;      /* Simple Pairing Complete */
 402                 events[7] |= 0x04;      /* User Passkey Notification */
 403                 events[7] |= 0x08;      /* Keypress Notification */
 404                 events[7] |= 0x10;      /* Remote Host Supported
 405                                          * Features Notification
 406                                          */
 407         }
 408
 409         if (lmp_le_capable(hdev))
 410                 events[7] |= 0x20;      /* LE Meta-Event */
 411
 412         hci_req_add(req, HCI_OP_SET_EVENT_MASK, sizeof(events), events);
 413 }
 414
 415 static int hci_init2_req(struct hci_request *req, unsigned long opt)
 416 {
 417         struct hci_dev *hdev = req->hdev;
 418
 419         if (hdev->dev_type == HCI_AMP)
 420                 return amp_init2(req);
 421
 422         if (lmp_bredr_capable(hdev))
 423                 bredr_setup(req);
 424         else
 425                 hci_dev_clear_flag(hdev, HCI_BREDR_ENABLED);
 426
 427         if (lmp_le_capable(hdev))
 428                 le_setup(req);
 429
 430         /* All Bluetooth 1.2 and later controllers should support the
 431          * HCI command for reading the local supported commands.
 432          *
 433          * Unfortunately some controllers indicate Bluetooth 1.2 support,
 434          * but do not have support for this command. If that is the case,
 435          * the driver can quirk the behavior and skip reading the local
 436          * supported commands.
 437          */
 438         if (hdev->hci_ver > BLUETOOTH_VER_1_1 &&
 439             !test_bit(HCI_QUIRK_BROKEN_LOCAL_COMMANDS, &hdev->quirks))
 440                 hci_req_add(req, HCI_OP_READ_LOCAL_COMMANDS, 0, NULL);
 441
 442         if (lmp_ssp_capable(hdev)) {
 443                 /* When SSP is available, then the host features page
 444                  * should also be available as well. However some
 445                  * controllers list the max_page as 0 as long as SSP
 446                  * has not been enabled. To achieve proper debugging
 447                  * output, force the minimum max_page to 1 at least.
 448                  */
 449                 hdev->max_page = 0x01;
 450
 451                 if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) {
 452                         u8 mode = 0x01;
 453
 454                         hci_req_add(req, HCI_OP_WRITE_SSP_MODE,
 455                                     sizeof(mode), &mode);
 456                 } else {
 457                         struct hci_cp_write_eir cp;
 458
 459                         memset(hdev->eir, 0, sizeof(hdev->eir));
 460                         memset(&cp, 0, sizeof(cp));
 461
 462                         hci_req_add(req, HCI_OP_WRITE_EIR, sizeof(cp), &cp);
 463                 }
 464         }
 465
 466         if (lmp_inq_rssi_capable(hdev) ||
 467             test_bit(HCI_QUIRK_FIXUP_INQUIRY_MODE, &hdev->quirks)) {
 468                 u8 mode;
 469
 470                 /* If Extended Inquiry Result events are supported, then
 471                  * they are clearly preferred over Inquiry Result with RSSI
 472                  * events.
 473                  */
 474                 mode = lmp_ext_inq_capable(hdev) ? 0x02 : 0x01;
 475
 476                 hci_req_add(req, HCI_OP_WRITE_INQUIRY_MODE, 1, &mode);
 477         }
 478
 479         if (lmp_inq_tx_pwr_capable(hdev))
 480                 hci_req_add(req, HCI_OP_READ_INQ_RSP_TX_POWER, 0, NULL);
 481
 482         if (lmp_ext_feat_capable(hdev)) {
 483                 struct hci_cp_read_local_ext_features cp;
 484
 485                 cp.page = 0x01;
 486                 hci_req_add(req, HCI_OP_READ_LOCAL_EXT_FEATURES,
 487                             sizeof(cp), &cp);
 488         }
 489
 490         if (hci_dev_test_flag(hdev, HCI_LINK_SECURITY)) {
 491                 u8 enable = 1;
 492                 hci_req_add(req, HCI_OP_WRITE_AUTH_ENABLE, sizeof(enable),
 493                             &enable);
 494         }
 495
 496         return 0;
 497 }
 498
 499 static void hci_setup_link_policy(struct hci_request *req)
 500 {
 501         struct hci_dev *hdev = req->hdev;
 502         struct hci_cp_write_def_link_policy cp;
 503         u16 link_policy = 0;
 504
 505         if (lmp_rswitch_capable(hdev))
 506                 link_policy |= HCI_LP_RSWITCH;
 507         if (lmp_hold_capable(hdev))
 508                 link_policy |= HCI_LP_HOLD;
 509         if (lmp_sniff_capable(hdev))
 510                 link_policy |= HCI_LP_SNIFF;
 511         if (lmp_park_capable(hdev))
 512                 link_policy |= HCI_LP_PARK;
 513
 514         cp.policy = cpu_to_le16(link_policy);
 515         hci_req_add(req, HCI_OP_WRITE_DEF_LINK_POLICY, sizeof(cp), &cp);
 516 }
 517
 518 static void hci_set_le_support(struct hci_request *req)
 519 {
 520         struct hci_dev *hdev = req->hdev;
 521         struct hci_cp_write_le_host_supported cp;
 522
 523         /* LE-only devices do not support explicit enablement */
 524         if (!lmp_bredr_capable(hdev))
 525                 return;
 526
 527         memset(&cp, 0, sizeof(cp));
 528
 529         if (hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
 530                 cp.le = 0x01;
 531                 cp.simul = 0x00;
 532         }
 533
 534         if (cp.le != lmp_host_le_capable(hdev))
 535                 hci_req_add(req, HCI_OP_WRITE_LE_HOST_SUPPORTED, sizeof(cp),
 536                             &cp);
 537 }
 538
 539 static void hci_set_event_mask_page_2(struct hci_request *req)
 540 {
 541         struct hci_dev *hdev = req->hdev;
 542         u8 events[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
 543         bool changed = false;
 544
 545         /* If Connectionless Slave Broadcast master role is supported
 546          * enable all necessary events for it.
 547          */
 548         if (lmp_csb_master_capable(hdev)) {
 549                 events[1] |= 0x40;      /* Triggered Clock Capture */
 550                 events[1] |= 0x80;      /* Synchronization Train Complete */
 551                 events[2] |= 0x10;      /* Slave Page Response Timeout */
 552                 events[2] |= 0x20;      /* CSB Channel Map Change */
 553                 changed = true;
 554         }
 555
 556         /* If Connectionless Slave Broadcast slave role is supported
 557          * enable all necessary events for it.
 558          */
 559         if (lmp_csb_slave_capable(hdev)) {
 560                 events[2] |= 0x01;      /* Synchronization Train Received */
 561                 events[2] |= 0x02;      /* CSB Receive */
 562                 events[2] |= 0x04;      /* CSB Timeout */
 563                 events[2] |= 0x08;      /* Truncated Page Complete */
 564                 changed = true;
 565         }
 566
 567         /* Enable Authenticated Payload Timeout Expired event if supported */
 568         if (lmp_ping_capable(hdev) || hdev->le_features[0] & HCI_LE_PING) {
 569                 events[2] |= 0x80;
 570                 changed = true;
 571         }
 572
 573         /* Some Broadcom based controllers indicate support for Set Event
 574          * Mask Page 2 command, but then actually do not support it. Since
 575          * the default value is all bits set to zero, the command is only
 576          * required if the event mask has to be changed. In case no change
 577          * to the event mask is needed, skip this command.
 578          */
 579         if (changed)
 580                 hci_req_add(req, HCI_OP_SET_EVENT_MASK_PAGE_2,
 581                             sizeof(events), events);
 582 }
 583
 584 static int hci_init3_req(struct hci_request *req, unsigned long opt)
 585 {
 586         struct hci_dev *hdev = req->hdev;
 587         u8 p;
 588
 589         hci_setup_event_mask(req);
 590
 591         if (hdev->commands[6] & 0x20 &&
 592             !test_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks)) {
 593                 struct hci_cp_read_stored_link_key cp;
 594
 595                 bacpy(&cp.bdaddr, BDADDR_ANY);
 596                 cp.read_all = 0x01;
 597                 hci_req_add(req, HCI_OP_READ_STORED_LINK_KEY, sizeof(cp), &cp);
 598         }
 599
 600         if (hdev->commands[5] & 0x10)
 601                 hci_setup_link_policy(req);
 602
 603         if (hdev->commands[8] & 0x01)
 604                 hci_req_add(req, HCI_OP_READ_PAGE_SCAN_ACTIVITY, 0, NULL);
 605
 606         /* Some older Broadcom based Bluetooth 1.2 controllers do not
 607          * support the Read Page Scan Type command. Check support for
 608          * this command in the bit mask of supported commands.
 609          */
 610         if (hdev->commands[13] & 0x01)
 611                 hci_req_add(req, HCI_OP_READ_PAGE_SCAN_TYPE, 0, NULL);
 612
 613         if (lmp_le_capable(hdev)) {
 614                 u8 events[8];
 615
 616                 memset(events, 0, sizeof(events));
 617
 618                 if (hdev->le_features[0] & HCI_LE_ENCRYPTION)
 619                         events[0] |= 0x10;      /* LE Long Term Key Request */
 620
 621                 /* If controller supports the Connection Parameters Request
 622                  * Link Layer Procedure, enable the corresponding event.
 623                  */
 624                 if (hdev->le_features[0] & HCI_LE_CONN_PARAM_REQ_PROC)
 625                         events[0] |= 0x20;      /* LE Remote Connection
 626                                                  * Parameter Request
 627                                                  */
 628
 629                 /* If the controller supports the Data Length Extension
 630                  * feature, enable the corresponding event.
 631                  */
 632                 if (hdev->le_features[0] & HCI_LE_DATA_LEN_EXT)
 633                         events[0] |= 0x40;      /* LE Data Length Change */
 634
 635                 /* If the controller supports Extended Scanner Filter
 636                  * Policies, enable the correspondig event.
 637                  */
 638                 if (hdev->le_features[0] & HCI_LE_EXT_SCAN_POLICY)
 639                         events[1] |= 0x04;      /* LE Direct Advertising
 640                                                  * Report
 641                                                  */
 642
 643                 /* If the controller supports Channel Selection Algorithm #2
 644                  * feature, enable the corresponding event.
 645                  */
 646                 if (hdev->le_features[1] & HCI_LE_CHAN_SEL_ALG2)
 647                         events[2] |= 0x08;      /* LE Channel Selection
 648                                                  * Algorithm
 649                                                  */
 650
 651                 /* If the controller supports the LE Set Scan Enable command,
 652                  * enable the corresponding advertising report event.
 653                  */
 654                 if (hdev->commands[26] & 0x08)
 655                         events[0] |= 0x02;      /* LE Advertising Report */
 656
 657                 /* If the controller supports the LE Create Connection
 658                  * command, enable the corresponding event.
 659                  */
 660                 if (hdev->commands[26] & 0x10)
 661                         events[0] |= 0x01;      /* LE Connection Complete */
 662
 663                 /* If the controller supports the LE Connection Update
 664                  * command, enable the corresponding event.
 665                  */
 666                 if (hdev->commands[27] & 0x04)
 667                         events[0] |= 0x04;      /* LE Connection Update
 668                                                  * Complete
 669                                                  */
 670
 671                 /* If the controller supports the LE Read Remote Used Features
 672                  * command, enable the corresponding event.
 673                  */
 674                 if (hdev->commands[27] & 0x20)
 675                         events[0] |= 0x08;      /* LE Read Remote Used
 676                                                  * Features Complete
 677                                                  */
 678
 679                 /* If the controller supports the LE Read Local P-256
 680                  * Public Key command, enable the corresponding event.
 681                  */
 682                 if (hdev->commands[34] & 0x02)
 683                         events[0] |= 0x80;      /* LE Read Local P-256
 684                                                  * Public Key Complete
 685                                                  */
 686
 687                 /* If the controller supports the LE Generate DHKey
 688                  * command, enable the corresponding event.
 689                  */
 690                 if (hdev->commands[34] & 0x04)
 691                         events[1] |= 0x01;      /* LE Generate DHKey Complete */
 692
 693                 /* If the controller supports the LE Set Default PHY or
 694                  * LE Set PHY commands, enable the corresponding event.
 695                  */
 696                 if (hdev->commands[35] & (0x20 | 0x40))
 697                         events[1] |= 0x08;        /* LE PHY Update Complete */
 698
 699                 /* If the controller supports LE Set Extended Scan Parameters
 700                  * and LE Set Extended Scan Enable commands, enable the
 701                  * corresponding event.
 702                  */
 703                 if (use_ext_scan(hdev))
 704                         events[1] |= 0x10;      /* LE Extended Advertising
 705                                                  * Report
 706                                                  */
 707
 708                 /* If the controller supports the LE Extended Create Connection
 709                  * command, enable the corresponding event.
 710                  */
 711                 if (use_ext_conn(hdev))
 712                         events[1] |= 0x02;      /* LE Enhanced Connection
 713                                                  * Complete
 714                                                  */
 715
 716                 /* If the controller supports the LE Extended Advertising
 717                  * command, enable the corresponding event.
 718                  */
 719                 if (ext_adv_capable(hdev))
 720                         events[2] |= 0x02;      /* LE Advertising Set
 721                                                  * Terminated
 722                                                  */
 723
 724                 hci_req_add(req, HCI_OP_LE_SET_EVENT_MASK, sizeof(events),
 725                             events);
 726
 727                 /* Read LE Advertising Channel TX Power */
 728                 if ((hdev->commands[25] & 0x40) && !ext_adv_capable(hdev)) {
 729                         /* HCI TS spec forbids mixing of legacy and extended
 730                          * advertising commands wherein READ_ADV_TX_POWER is
 731                          * also included. So do not call it if extended adv
 732                          * is supported otherwise controller will return
 733                          * COMMAND_DISALLOWED for extended commands.
 734                          */
 735                         hci_req_add(req, HCI_OP_LE_READ_ADV_TX_POWER, 0, NULL);
 736                 }
 737
 738                 if (hdev->commands[26] & 0x40) {
 739                         /* Read LE White List Size */
 740                         hci_req_add(req, HCI_OP_LE_READ_WHITE_LIST_SIZE,
 741                                     0, NULL);
 742                 }
 743
 744                 if (hdev->commands[26] & 0x80) {
 745                         /* Clear LE White List */
 746                         hci_req_add(req, HCI_OP_LE_CLEAR_WHITE_LIST, 0, NULL);
 747                 }
 748
 749                 if (hdev->commands[34] & 0x40) {
 750                         /* Read LE Resolving List Size */
 751                         hci_req_add(req, HCI_OP_LE_READ_RESOLV_LIST_SIZE,
 752                                     0, NULL);
 753                 }
 754
 755                 if (hdev->commands[34] & 0x20) {
 756                         /* Clear LE Resolving List */
 757                         hci_req_add(req, HCI_OP_LE_CLEAR_RESOLV_LIST, 0, NULL);
 758                 }
 759
 760                 if (hdev->le_features[0] & HCI_LE_DATA_LEN_EXT) {
 761                         /* Read LE Maximum Data Length */
 762                         hci_req_add(req, HCI_OP_LE_READ_MAX_DATA_LEN, 0, NULL);
 763
 764                         /* Read LE Suggested Default Data Length */
 765                         hci_req_add(req, HCI_OP_LE_READ_DEF_DATA_LEN, 0, NULL);
 766                 }
 767
 768                 if (ext_adv_capable(hdev)) {
 769                         /* Read LE Number of Supported Advertising Sets */
 770                         hci_req_add(req, HCI_OP_LE_READ_NUM_SUPPORTED_ADV_SETS,
 771                                     0, NULL);
 772                 }
 773
 774                 hci_set_le_support(req);
 775         }
 776
 777         /* Read features beyond page 1 if available */
 778         for (p = 2; p < HCI_MAX_PAGES && p <= hdev->max_page; p++) {
 779                 struct hci_cp_read_local_ext_features cp;
 780
 781                 cp.page = p;
 782                 hci_req_add(req, HCI_OP_READ_LOCAL_EXT_FEATURES,
 783                             sizeof(cp), &cp);
 784         }
 785
 786         return 0;
 787 }
 788
 789 static int hci_init4_req(struct hci_request *req, unsigned long opt)
 790 {
 791         struct hci_dev *hdev = req->hdev;
 792
 793         /* Some Broadcom based Bluetooth controllers do not support the
 794          * Delete Stored Link Key command. They are clearly indicating its
 795          * absence in the bit mask of supported commands.
 796          *
 797          * Check the supported commands and only if the the command is marked
 798          * as supported send it. If not supported assume that the controller
 799          * does not have actual support for stored link keys which makes this
 800          * command redundant anyway.
 801          *
 802          * Some controllers indicate that they support handling deleting
 803          * stored link keys, but they don't. The quirk lets a driver
 804          * just disable this command.
 805          */
 806         if (hdev->commands[6] & 0x80 &&
 807             !test_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks)) {
 808                 struct hci_cp_delete_stored_link_key cp;
 809
 810                 bacpy(&cp.bdaddr, BDADDR_ANY);
 811                 cp.delete_all = 0x01;
 812                 hci_req_add(req, HCI_OP_DELETE_STORED_LINK_KEY,
 813                             sizeof(cp), &cp);
 814         }
 815
 816         /* Set event mask page 2 if the HCI command for it is supported */
 817         if (hdev->commands[22] & 0x04)
 818                 hci_set_event_mask_page_2(req);
 819
 820         /* Read local codec list if the HCI command is supported */
 821         if (hdev->commands[29] & 0x20)
 822                 hci_req_add(req, HCI_OP_READ_LOCAL_CODECS, 0, NULL);
 823
 824         /* Get MWS transport configuration if the HCI command is supported */
 825         if (hdev->commands[30] & 0x08)
 826                 hci_req_add(req, HCI_OP_GET_MWS_TRANSPORT_CONFIG, 0, NULL);
 827
 828         /* Check for Synchronization Train support */
 829         if (lmp_sync_train_capable(hdev))
 830                 hci_req_add(req, HCI_OP_READ_SYNC_TRAIN_PARAMS, 0, NULL);
 831
 832         /* Enable Secure Connections if supported and configured */
 833         if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED) &&
 834             bredr_sc_enabled(hdev)) {
 835                 u8 support = 0x01;
 836
 837                 hci_req_add(req, HCI_OP_WRITE_SC_SUPPORT,
 838                             sizeof(support), &support);
 839         }
 840
 841         /* Set Suggested Default Data Length to maximum if supported */
 842         if (hdev->le_features[0] & HCI_LE_DATA_LEN_EXT) {
 843                 struct hci_cp_le_write_def_data_len cp;
 844
 845                 cp.tx_len = hdev->le_max_tx_len;
 846                 cp.tx_time = hdev->le_max_tx_time;
 847                 hci_req_add(req, HCI_OP_LE_WRITE_DEF_DATA_LEN, sizeof(cp), &cp);
 848         }
 849
 850         /* Set Default PHY parameters if command is supported */
 851         if (hdev->commands[35] & 0x20) {
 852                 struct hci_cp_le_set_default_phy cp;
 853
 854                 cp.all_phys = 0x00;
 855                 cp.tx_phys = hdev->le_tx_def_phys;
 856                 cp.rx_phys = hdev->le_rx_def_phys;
 857
 858                 hci_req_add(req, HCI_OP_LE_SET_DEFAULT_PHY, sizeof(cp), &cp);
 859         }
 860
 861         return 0;
 862 }
 863
 864 static int __hci_init(struct hci_dev *hdev)
 865 {
 866         int err;
 867
 868         err = __hci_req_sync(hdev, hci_init1_req, 0, HCI_INIT_TIMEOUT, NULL);
 869         if (err < 0)
 870                 return err;
 871
 872         if (hci_dev_test_flag(hdev, HCI_SETUP))
 873                 hci_debugfs_create_basic(hdev);
 874
 875         err = __hci_req_sync(hdev, hci_init2_req, 0, HCI_INIT_TIMEOUT, NULL);
 876         if (err < 0)
 877                 return err;
 878
 879         /* HCI_PRIMARY covers both single-mode LE, BR/EDR and dual-mode
 880          * BR/EDR/LE type controllers. AMP controllers only need the
 881          * first two stages of init.
 882          */
 883         if (hdev->dev_type != HCI_PRIMARY)
 884                 return 0;
 885
 886         err = __hci_req_sync(hdev, hci_init3_req, 0, HCI_INIT_TIMEOUT, NULL);
 887         if (err < 0)
 888                 return err;
 889
 890         err = __hci_req_sync(hdev, hci_init4_req, 0, HCI_INIT_TIMEOUT, NULL);
 891         if (err < 0)
 892                 return err;
 893
 894         /* This function is only called when the controller is actually in
 895          * configured state. When the controller is marked as unconfigured,
 896          * this initialization procedure is not run.
 897          *
 898          * It means that it is possible that a controller runs through its
 899          * setup phase and then discovers missing settings. If that is the
 900          * case, then this function will not be called. It then will only
 901          * be called during the config phase.
 902          *
 903          * So only when in setup phase or config phase, create the debugfs
 904          * entries and register the SMP channels.
 905          */
 906         if (!hci_dev_test_flag(hdev, HCI_SETUP) &&
 907             !hci_dev_test_flag(hdev, HCI_CONFIG))
 908                 return 0;
 909
 910         hci_debugfs_create_common(hdev);
 911
 912         if (lmp_bredr_capable(hdev))
 913                 hci_debugfs_create_bredr(hdev);
 914
 915         if (lmp_le_capable(hdev))
 916                 hci_debugfs_create_le(hdev);
 917
 918         return 0;
 919 }
 920
 921 static int hci_init0_req(struct hci_request *req, unsigned long opt)
 922 {
 923         struct hci_dev *hdev = req->hdev;
 924
 925         BT_DBG("%s %ld", hdev->name, opt);
 926
 927         /* Reset */
 928         if (!test_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks))
 929                 hci_reset_req(req, 0);
 930
 931         /* Read Local Version */
 932         hci_req_add(req, HCI_OP_READ_LOCAL_VERSION, 0, NULL);
 933
 934         /* Read BD Address */
 935         if (hdev->set_bdaddr)
 936                 hci_req_add(req, HCI_OP_READ_BD_ADDR, 0, NULL);
 937
 938         return 0;
 939 }
 940
 941 static int __hci_unconf_init(struct hci_dev *hdev)
 942 {
 943         int err;
 944
 945         if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
 946                 return 0;
 947
 948         err = __hci_req_sync(hdev, hci_init0_req, 0, HCI_INIT_TIMEOUT, NULL);
 949         if (err < 0)
 950                 return err;
 951
 952         if (hci_dev_test_flag(hdev, HCI_SETUP))
 953                 hci_debugfs_create_basic(hdev);
 954
 955         return 0;
 956 }
 957
 958 static int hci_scan_req(struct hci_request *req, unsigned long opt)
 959 {
 960         __u8 scan = opt;
 961
 962         BT_DBG("%s %x", req->hdev->name, scan);
 963
 964         /* Inquiry and Page scans */
 965         hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
 966         return 0;
 967 }
 968
 969 static int hci_auth_req(struct hci_request *req, unsigned long opt)
 970 {
 971         __u8 auth = opt;
 972
 973         BT_DBG("%s %x", req->hdev->name, auth);
 974
 975         /* Authentication */
 976         hci_req_add(req, HCI_OP_WRITE_AUTH_ENABLE, 1, &auth);
 977         return 0;
 978 }
 979
 980 static int hci_encrypt_req(struct hci_request *req, unsigned long opt)
 981 {
 982         __u8 encrypt = opt;
 983
 984         BT_DBG("%s %x", req->hdev->name, encrypt);
 985
 986         /* Encryption */
 987         hci_req_add(req, HCI_OP_WRITE_ENCRYPT_MODE, 1, &encrypt);
 988         return 0;
 989 }
 990
 991 static int hci_linkpol_req(struct hci_request *req, unsigned long opt)
 992 {
 993         __le16 policy = cpu_to_le16(opt);
 994
 995         BT_DBG("%s %x", req->hdev->name, policy);
 996
 997         /* Default link policy */
 998         hci_req_add(req, HCI_OP_WRITE_DEF_LINK_POLICY, 2, &policy);
 999         return 0;
1000 }
1001
1002 /* Get HCI device by index.
1003  * Device is held on return. */
1004 struct hci_dev *hci_dev_get(int index)
1005 {
1006         struct hci_dev *hdev = NULL, *d;
1007
1008         BT_DBG("%d", index);
1009
1010         if (index < 0)
1011                 return NULL;
1012
1013         read_lock(&hci_dev_list_lock);
1014         list_for_each_entry(d, &hci_dev_list, list) {
1015                 if (d->id == index) {
1016                         hdev = hci_dev_hold(d);
1017                         break;
1018                 }
1019         }
1020         read_unlock(&hci_dev_list_lock);
1021         return hdev;
1022 }
1023
1024 /* ---- Inquiry support ---- */
1025
1026 bool hci_discovery_active(struct hci_dev *hdev)
1027 {
1028         struct discovery_state *discov = &hdev->discovery;
1029
1030         switch (discov->state) {
1031         case DISCOVERY_FINDING:
1032         case DISCOVERY_RESOLVING:
1033                 return true;
1034
1035         default:
1036                 return false;
1037         }
1038 }
1039
1040 void hci_discovery_set_state(struct hci_dev *hdev, int state)
1041 {
1042         int old_state = hdev->discovery.state;
1043
1044         BT_DBG("%s state %u -> %u", hdev->name, hdev->discovery.state, state);
1045
1046         if (old_state == state)
1047                 return;
1048
1049         hdev->discovery.state = state;
1050
1051         switch (state) {
1052         case DISCOVERY_STOPPED:
1053                 hci_update_background_scan(hdev);
1054
1055                 if (old_state != DISCOVERY_STARTING)
1056                         mgmt_discovering(hdev, 0);
1057                 break;
1058         case DISCOVERY_STARTING:
1059                 break;
1060         case DISCOVERY_FINDING:
1061                 mgmt_discovering(hdev, 1);
1062                 break;
1063         case DISCOVERY_RESOLVING:
1064                 break;
1065         case DISCOVERY_STOPPING:
1066                 break;
1067         }
1068 }
1069
1070 void hci_inquiry_cache_flush(struct hci_dev *hdev)
1071 {
1072         struct discovery_state *cache = &hdev->discovery;
1073         struct inquiry_entry *p, *n;
1074
1075         list_for_each_entry_safe(p, n, &cache->all, all) {
1076                 list_del(&p->all);
1077                 kfree(p);
1078         }
1079
1080         INIT_LIST_HEAD(&cache->unknown);
1081         INIT_LIST_HEAD(&cache->resolve);
1082 }
1083
1084 struct inquiry_entry *hci_inquiry_cache_lookup(struct hci_dev *hdev,
1085                                                bdaddr_t *bdaddr)
1086 {
1087         struct discovery_state *cache = &hdev->discovery;
1088         struct inquiry_entry *e;
1089
1090         BT_DBG("cache %p, %pMR", cache, bdaddr);
1091
1092         list_for_each_entry(e, &cache->all, all) {
1093                 if (!bacmp(&e->data.bdaddr, bdaddr))
1094                         return e;
1095         }
1096
1097         return NULL;
1098 }
1099
1100 struct inquiry_entry *hci_inquiry_cache_lookup_unknown(struct hci_dev *hdev,
1101                                                        bdaddr_t *bdaddr)
1102 {
1103         struct discovery_state *cache = &hdev->discovery;
1104         struct inquiry_entry *e;
1105
1106         BT_DBG("cache %p, %pMR", cache, bdaddr);
1107
1108         list_for_each_entry(e, &cache->unknown, list) {
1109                 if (!bacmp(&e->data.bdaddr, bdaddr))
1110                         return e;
1111         }
1112
1113         return NULL;
1114 }
1115
1116 struct inquiry_entry *hci_inquiry_cache_lookup_resolve(struct hci_dev *hdev,
1117                                                        bdaddr_t *bdaddr,
1118                                                        int state)
1119 {
1120         struct discovery_state *cache = &hdev->discovery;
1121         struct inquiry_entry *e;
1122
1123         BT_DBG("cache %p bdaddr %pMR state %d", cache, bdaddr, state);
1124
1125         list_for_each_entry(e, &cache->resolve, list) {
1126                 if (!bacmp(bdaddr, BDADDR_ANY) && e->name_state == state)
1127                         return e;
1128                 if (!bacmp(&e->data.bdaddr, bdaddr))
1129                         return e;
1130         }
1131
1132         return NULL;
1133 }
1134
1135 void hci_inquiry_cache_update_resolve(struct hci_dev *hdev,
1136                                       struct inquiry_entry *ie)
1137 {
1138         struct discovery_state *cache = &hdev->discovery;
1139         struct list_head *pos = &cache->resolve;
1140         struct inquiry_entry *p;
1141
1142         list_del(&ie->list);
1143
1144         list_for_each_entry(p, &cache->resolve, list) {
1145                 if (p->name_state != NAME_PENDING &&
1146                     abs(p->data.rssi) >= abs(ie->data.rssi))
1147                         break;
1148                 pos = &p->list;
1149         }
1150
1151         list_add(&ie->list, pos);
1152 }
1153
1154 u32 hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data,
1155                              bool name_known)
1156 {
1157         struct discovery_state *cache = &hdev->discovery;
1158         struct inquiry_entry *ie;
1159         u32 flags = 0;
1160
1161         BT_DBG("cache %p, %pMR", cache, &data->bdaddr);
1162
1163         hci_remove_remote_oob_data(hdev, &data->bdaddr, BDADDR_BREDR);
1164
1165         if (!data->ssp_mode)
1166                 flags |= MGMT_DEV_FOUND_LEGACY_PAIRING;
1167
1168         ie = hci_inquiry_cache_lookup(hdev, &data->bdaddr);
1169         if (ie) {
1170                 if (!ie->data.ssp_mode)
1171                         flags |= MGMT_DEV_FOUND_LEGACY_PAIRING;
1172
1173                 if (ie->name_state == NAME_NEEDED &&
1174                     data->rssi != ie->data.rssi) {
1175                         ie->data.rssi = data->rssi;
1176                         hci_inquiry_cache_update_resolve(hdev, ie);
1177                 }
1178
1179                 goto update;
1180         }
1181
1182         /* Entry not in the cache. Add new one. */
1183         ie = kzalloc(sizeof(*ie), GFP_KERNEL);
1184         if (!ie) {
1185                 flags |= MGMT_DEV_FOUND_CONFIRM_NAME;
1186                 goto done;
1187         }
1188
1189         list_add(&ie->all, &cache->all);
1190
1191         if (name_known) {
1192                 ie->name_state = NAME_KNOWN;
1193         } else {
1194                 ie->name_state = NAME_NOT_KNOWN;
1195                 list_add(&ie->list, &cache->unknown);
1196         }
1197
1198 update:
1199         if (name_known && ie->name_state != NAME_KNOWN &&
1200             ie->name_state != NAME_PENDING) {
1201                 ie->name_state = NAME_KNOWN;
1202                 list_del(&ie->list);
1203         }
1204
1205         memcpy(&ie->data, data, sizeof(*data));
1206         ie->timestamp = jiffies;
1207         cache->timestamp = jiffies;
1208
1209         if (ie->name_state == NAME_NOT_KNOWN)
1210                 flags |= MGMT_DEV_FOUND_CONFIRM_NAME;
1211
1212 done:
1213         return flags;
1214 }
1215
1216 static int inquiry_cache_dump(struct hci_dev *hdev, int num, __u8 *buf)
1217 {
1218         struct discovery_state *cache = &hdev->discovery;
1219         struct inquiry_info *info = (struct inquiry_info *) buf;
1220         struct inquiry_entry *e;
1221         int copied = 0;
1222
1223         list_for_each_entry(e, &cache->all, all) {
1224                 struct inquiry_data *data = &e->data;
1225
1226                 if (copied >= num)
1227                         break;
1228
1229                 bacpy(&info->bdaddr, &data->bdaddr);
1230                 info->pscan_rep_mode    = data->pscan_rep_mode;
1231                 info->pscan_period_mode = data->pscan_period_mode;
1232                 info->pscan_mode        = data->pscan_mode;
1233                 memcpy(info->dev_class, data->dev_class, 3);
1234                 info->clock_offset      = data->clock_offset;
1235
1236                 info++;
1237                 copied++;
1238         }
1239
1240         BT_DBG("cache %p, copied %d", cache, copied);
1241         return copied;
1242 }
1243
1244 static int hci_inq_req(struct hci_request *req, unsigned long opt)
1245 {
1246         struct hci_inquiry_req *ir = (struct hci_inquiry_req *) opt;
1247         struct hci_dev *hdev = req->hdev;
1248         struct hci_cp_inquiry cp;
1249
1250         BT_DBG("%s", hdev->name);
1251
1252         if (test_bit(HCI_INQUIRY, &hdev->flags))
1253                 return 0;
1254
1255         /* Start Inquiry */
1256         memcpy(&cp.lap, &ir->lap, 3);
1257         cp.length  = ir->length;
1258         cp.num_rsp = ir->num_rsp;
1259         hci_req_add(req, HCI_OP_INQUIRY, sizeof(cp), &cp);
1260
1261         return 0;
1262 }
1263
1264 int hci_inquiry(void __user *arg)
1265 {
1266         __u8 __user *ptr = arg;
1267         struct hci_inquiry_req ir;
1268         struct hci_dev *hdev;
1269         int err = 0, do_inquiry = 0, max_rsp;
1270         long timeo;
1271         __u8 *buf;
1272
1273         if (copy_from_user(&ir, ptr, sizeof(ir)))
1274                 return -EFAULT;
1275
1276         hdev = hci_dev_get(ir.dev_id);
1277         if (!hdev)
1278                 return -ENODEV;
1279
1280         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1281                 err = -EBUSY;
1282                 goto done;
1283         }
1284
1285         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
1286                 err = -EOPNOTSUPP;
1287                 goto done;
1288         }
1289
1290         if (hdev->dev_type != HCI_PRIMARY) {
1291                 err = -EOPNOTSUPP;
1292                 goto done;
1293         }
1294
1295         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1296                 err = -EOPNOTSUPP;
1297                 goto done;
1298         }
1299
1300         hci_dev_lock(hdev);
1301         if (inquiry_cache_age(hdev) > INQUIRY_CACHE_AGE_MAX ||
1302             inquiry_cache_empty(hdev) || ir.flags & IREQ_CACHE_FLUSH) {
1303                 hci_inquiry_cache_flush(hdev);
1304                 do_inquiry = 1;
1305         }
1306         hci_dev_unlock(hdev);
1307
1308         timeo = ir.length * msecs_to_jiffies(2000);
1309
1310         if (do_inquiry) {
1311                 err = hci_req_sync(hdev, hci_inq_req, (unsigned long) &ir,
1312                                    timeo, NULL);
1313                 if (err < 0)
1314                         goto done;
1315
1316                 /* Wait until Inquiry procedure finishes (HCI_INQUIRY flag is
1317                  * cleared). If it is interrupted by a signal, return -EINTR.
1318                  */
1319                 if (wait_on_bit(&hdev->flags, HCI_INQUIRY,
1320                                 TASK_INTERRUPTIBLE))
1321                         return -EINTR;
1322         }
1323
1324         /* for unlimited number of responses we will use buffer with
1325          * 255 entries
1326          */
1327         max_rsp = (ir.num_rsp == 0) ? 255 : ir.num_rsp;
1328
1329         /* cache_dump can't sleep. Therefore we allocate temp buffer and then
1330          * copy it to the user space.
1331          */
1332         buf = kmalloc_array(max_rsp, sizeof(struct inquiry_info), GFP_KERNEL);
1333         if (!buf) {
1334                 err = -ENOMEM;
1335                 goto done;
1336         }
1337
1338         hci_dev_lock(hdev);
1339         ir.num_rsp = inquiry_cache_dump(hdev, max_rsp, buf);
1340         hci_dev_unlock(hdev);
1341
1342         BT_DBG("num_rsp %d", ir.num_rsp);
1343
1344         if (!copy_to_user(ptr, &ir, sizeof(ir))) {
1345                 ptr += sizeof(ir);
1346                 if (copy_to_user(ptr, buf, sizeof(struct inquiry_info) *
1347                                  ir.num_rsp))
1348                         err = -EFAULT;
1349         } else
1350                 err = -EFAULT;
1351
1352         kfree(buf);
1353
1354 done:
1355         hci_dev_put(hdev);
1356         return err;
1357 }
1358
1359 /**
1360  * hci_dev_get_bd_addr_from_property - Get the Bluetooth Device Address
1361  *                                     (BD_ADDR) for a HCI device from
1362  *                                     a firmware node property.
1363  * @hdev:       The HCI device
1364  *
1365  * Search the firmware node for 'local-bd-address'.
1366  *
1367  * All-zero BD addresses are rejected, because those could be properties
1368  * that exist in the firmware tables, but were not updated by the firmware. For
1369  * example, the DTS could define 'local-bd-address', with zero BD addresses.
1370  */
1371 static void hci_dev_get_bd_addr_from_property(struct hci_dev *hdev)
1372 {
1373         struct fwnode_handle *fwnode = dev_fwnode(hdev->dev.parent);
1374         bdaddr_t ba;
1375         int ret;
1376
1377         ret = fwnode_property_read_u8_array(fwnode, "local-bd-address",
1378                                             (u8 *)&ba, sizeof(ba));
1379         if (ret < 0 || !bacmp(&ba, BDADDR_ANY))
1380                 return;
1381
1382         bacpy(&hdev->public_addr, &ba);
1383 }
1384
1385 static int hci_dev_do_open(struct hci_dev *hdev)
1386 {
1387         int ret = 0;
1388
1389         BT_DBG("%s %p", hdev->name, hdev);
1390
1391         hci_req_sync_lock(hdev);
1392
1393         if (hci_dev_test_flag(hdev, HCI_UNREGISTER)) {
1394                 ret = -ENODEV;
1395                 goto done;
1396         }
1397
1398         if (!hci_dev_test_flag(hdev, HCI_SETUP) &&
1399             !hci_dev_test_flag(hdev, HCI_CONFIG)) {
1400                 /* Check for rfkill but allow the HCI setup stage to
1401                  * proceed (which in itself doesn't cause any RF activity).
1402                  */
1403                 if (hci_dev_test_flag(hdev, HCI_RFKILLED)) {
1404                         ret = -ERFKILL;
1405                         goto done;
1406                 }
1407
1408                 /* Check for valid public address or a configured static
1409                  * random adddress, but let the HCI setup proceed to
1410                  * be able to determine if there is a public address
1411                  * or not.
1412                  *
1413                  * In case of user channel usage, it is not important
1414                  * if a public address or static random address is
1415                  * available.
1416                  *
1417                  * This check is only valid for BR/EDR controllers
1418                  * since AMP controllers do not have an address.
1419                  */
1420                 if (!hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
1421                     hdev->dev_type == HCI_PRIMARY &&
1422                     !bacmp(&hdev->bdaddr, BDADDR_ANY) &&
1423                     !bacmp(&hdev->static_addr, BDADDR_ANY)) {
1424                         ret = -EADDRNOTAVAIL;
1425                         goto done;
1426                 }
1427         }
1428
1429         if (test_bit(HCI_UP, &hdev->flags)) {
1430                 ret = -EALREADY;
1431                 goto done;
1432         }
1433
1434         if (hdev->open(hdev)) {
1435                 ret = -EIO;
1436                 goto done;
1437         }
1438
1439         set_bit(HCI_RUNNING, &hdev->flags);
1440         hci_sock_dev_event(hdev, HCI_DEV_OPEN);
1441
1442         atomic_set(&hdev->cmd_cnt, 1);
1443         set_bit(HCI_INIT, &hdev->flags);
1444
1445         if (hci_dev_test_flag(hdev, HCI_SETUP) ||
1446             test_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks)) {
1447                 hci_sock_dev_event(hdev, HCI_DEV_SETUP);
1448
1449                 if (hdev->setup)
1450                         ret = hdev->setup(hdev);
1451
1452                 if (ret)
1453                         goto setup_failed;
1454
1455                 if (test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks)) {
1456                         if (!bacmp(&hdev->public_addr, BDADDR_ANY))
1457                                 hci_dev_get_bd_addr_from_property(hdev);
1458
1459                         if (bacmp(&hdev->public_addr, BDADDR_ANY) &&
1460                             hdev->set_bdaddr)
1461                                 ret = hdev->set_bdaddr(hdev,
1462                                                        &hdev->public_addr);
1463                 }
1464
1465 setup_failed:
1466                 /* The transport driver can set these quirks before
1467                  * creating the HCI device or in its setup callback.
1468                  *
1469                  * In case any of them is set, the controller has to
1470                  * start up as unconfigured.
1471                  */
1472                 if (test_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks) ||
1473                     test_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks))
1474                         hci_dev_set_flag(hdev, HCI_UNCONFIGURED);
1475
1476                 /* For an unconfigured controller it is required to
1477                  * read at least the version information provided by
1478                  * the Read Local Version Information command.
1479                  *
1480                  * If the set_bdaddr driver callback is provided, then
1481                  * also the original Bluetooth public device address
1482                  * will be read using the Read BD Address command.
1483                  */
1484                 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
1485                         ret = __hci_unconf_init(hdev);
1486         }
1487
1488         if (hci_dev_test_flag(hdev, HCI_CONFIG)) {
1489                 /* If public address change is configured, ensure that
1490                  * the address gets programmed. If the driver does not
1491                  * support changing the public address, fail the power
1492                  * on procedure.
1493                  */
1494                 if (bacmp(&hdev->public_addr, BDADDR_ANY) &&
1495                     hdev->set_bdaddr)
1496                         ret = hdev->set_bdaddr(hdev, &hdev->public_addr);
1497                 else
1498                         ret = -EADDRNOTAVAIL;
1499         }
1500
1501         if (!ret) {
1502                 if (!hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
1503                     !hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1504                         ret = __hci_init(hdev);
1505                         if (!ret && hdev->post_init)
1506                                 ret = hdev->post_init(hdev);
1507                 }
1508         }
1509
1510         /* If the HCI Reset command is clearing all diagnostic settings,
1511          * then they need to be reprogrammed after the init procedure
1512          * completed.
1513          */
1514         if (test_bit(HCI_QUIRK_NON_PERSISTENT_DIAG, &hdev->quirks) &&
1515             !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
1516             hci_dev_test_flag(hdev, HCI_VENDOR_DIAG) && hdev->set_diag)
1517                 ret = hdev->set_diag(hdev, true);
1518
1519         clear_bit(HCI_INIT, &hdev->flags);
1520
1521         if (!ret) {
1522                 hci_dev_hold(hdev);
1523                 hci_dev_set_flag(hdev, HCI_RPA_EXPIRED);
1524                 hci_adv_instances_set_rpa_expired(hdev, true);
1525                 set_bit(HCI_UP, &hdev->flags);
1526                 hci_sock_dev_event(hdev, HCI_DEV_UP);
1527                 hci_leds_update_powered(hdev, true);
1528                 if (!hci_dev_test_flag(hdev, HCI_SETUP) &&
1529                     !hci_dev_test_flag(hdev, HCI_CONFIG) &&
1530                     !hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
1531                     !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
1532                     hci_dev_test_flag(hdev, HCI_MGMT) &&
1533                     hdev->dev_type == HCI_PRIMARY) {
1534                         ret = __hci_req_hci_power_on(hdev);
1535                         mgmt_power_on(hdev, ret);
1536                 }
1537         } else {
1538                 /* Init failed, cleanup */
1539                 flush_work(&hdev->tx_work);
1540                 flush_work(&hdev->cmd_work);
1541                 flush_work(&hdev->rx_work);
1542
1543                 skb_queue_purge(&hdev->cmd_q);
1544                 skb_queue_purge(&hdev->rx_q);
1545
1546                 if (hdev->flush)
1547                         hdev->flush(hdev);
1548
1549                 if (hdev->sent_cmd) {
1550                         kfree_skb(hdev->sent_cmd);
1551                         hdev->sent_cmd = NULL;
1552                 }
1553
1554                 clear_bit(HCI_RUNNING, &hdev->flags);
1555                 hci_sock_dev_event(hdev, HCI_DEV_CLOSE);
1556
1557                 hdev->close(hdev);
1558                 hdev->flags &= BIT(HCI_RAW);
1559         }
1560
1561 done:
1562         hci_req_sync_unlock(hdev);
1563         return ret;
1564 }
1565
1566 /* ---- HCI ioctl helpers ---- */
1567
1568 int hci_dev_open(__u16 dev)
1569 {
1570         struct hci_dev *hdev;
1571         int err;
1572
1573         hdev = hci_dev_get(dev);
1574         if (!hdev)
1575                 return -ENODEV;
1576
1577         /* Devices that are marked as unconfigured can only be powered
1578          * up as user channel. Trying to bring them up as normal devices
1579          * will result into a failure. Only user channel operation is
1580          * possible.
1581          *
1582          * When this function is called for a user channel, the flag
1583          * HCI_USER_CHANNEL will be set first before attempting to
1584          * open the device.
1585          */
1586         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
1587             !hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1588                 err = -EOPNOTSUPP;
1589                 goto done;
1590         }
1591
1592         /* We need to ensure that no other power on/off work is pending
1593          * before proceeding to call hci_dev_do_open. This is
1594          * particularly important if the setup procedure has not yet
1595          * completed.
1596          */
1597         if (hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF))
1598                 cancel_delayed_work(&hdev->power_off);
1599
1600         /* After this call it is guaranteed that the setup procedure
1601          * has finished. This means that error conditions like RFKILL
1602          * or no valid public or static random address apply.
1603          */
1604         flush_workqueue(hdev->req_workqueue);
1605
1606         /* For controllers not using the management interface and that
1607          * are brought up using legacy ioctl, set the HCI_BONDABLE bit
1608          * so that pairing works for them. Once the management interface
1609          * is in use this bit will be cleared again and userspace has
1610          * to explicitly enable it.
1611          */
1612         if (!hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
1613             !hci_dev_test_flag(hdev, HCI_MGMT))
1614                 hci_dev_set_flag(hdev, HCI_BONDABLE);
1615
1616         err = hci_dev_do_open(hdev);
1617
1618 done:
1619         hci_dev_put(hdev);
1620         return err;
1621 }
1622
1623 /* This function requires the caller holds hdev->lock */
1624 static void hci_pend_le_actions_clear(struct hci_dev *hdev)
1625 {
1626         struct hci_conn_params *p;
1627
1628         list_for_each_entry(p, &hdev->le_conn_params, list) {
1629                 if (p->conn) {
1630                         hci_conn_drop(p->conn);
1631                         hci_conn_put(p->conn);
1632                         p->conn = NULL;
1633                 }
1634                 list_del_init(&p->action);
1635         }
1636
1637         BT_DBG("All LE pending actions cleared");
1638 }
1639
1640 int hci_dev_do_close(struct hci_dev *hdev)
1641 {
1642         bool auto_off;
1643
1644         BT_DBG("%s %p", hdev->name, hdev);
1645
1646         if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
1647             !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
1648             test_bit(HCI_UP, &hdev->flags)) {
1649                 /* Execute vendor specific shutdown routine */
1650                 if (hdev->shutdown)
1651                         hdev->shutdown(hdev);
1652         }
1653
1654         cancel_delayed_work(&hdev->power_off);
1655
1656         hci_request_cancel_all(hdev);
1657         hci_req_sync_lock(hdev);
1658
1659         if (!test_and_clear_bit(HCI_UP, &hdev->flags)) {
1660                 cancel_delayed_work_sync(&hdev->cmd_timer);
1661                 hci_req_sync_unlock(hdev);
1662                 return 0;
1663         }
1664
1665         hci_leds_update_powered(hdev, false);
1666
1667         /* Flush RX and TX works */
1668         flush_work(&hdev->tx_work);
1669         flush_work(&hdev->rx_work);
1670
1671         if (hdev->discov_timeout > 0) {
1672                 hdev->discov_timeout = 0;
1673                 hci_dev_clear_flag(hdev, HCI_DISCOVERABLE);
1674                 hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);
1675         }
1676
1677         if (hci_dev_test_and_clear_flag(hdev, HCI_SERVICE_CACHE))
1678                 cancel_delayed_work(&hdev->service_cache);
1679
1680         if (hci_dev_test_flag(hdev, HCI_MGMT)) {
1681                 struct adv_info *adv_instance;
1682
1683                 cancel_delayed_work_sync(&hdev->rpa_expired);
1684
1685                 list_for_each_entry(adv_instance, &hdev->adv_instances, list)
1686                         cancel_delayed_work_sync(&adv_instance->rpa_expired_cb);
1687         }
1688
1689         /* Avoid potential lockdep warnings from the *_flush() calls by
1690          * ensuring the workqueue is empty up front.
1691          */
1692         drain_workqueue(hdev->workqueue);
1693
1694         hci_dev_lock(hdev);
1695
1696         hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
1697
1698         auto_off = hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF);
1699
1700         if (!auto_off && hdev->dev_type == HCI_PRIMARY &&
1701             !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
1702             hci_dev_test_flag(hdev, HCI_MGMT))
1703                 __mgmt_power_off(hdev);
1704
1705         hci_inquiry_cache_flush(hdev);
1706         hci_pend_le_actions_clear(hdev);
1707         hci_conn_hash_flush(hdev);
1708         hci_dev_unlock(hdev);
1709
1710         smp_unregister(hdev);
1711
1712         hci_sock_dev_event(hdev, HCI_DEV_DOWN);
1713
1714         if (hdev->flush)
1715                 hdev->flush(hdev);
1716
1717         /* Reset device */
1718         skb_queue_purge(&hdev->cmd_q);
1719         atomic_set(&hdev->cmd_cnt, 1);
1720         if (test_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks) &&
1721             !auto_off && !hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
1722                 set_bit(HCI_INIT, &hdev->flags);
1723                 __hci_req_sync(hdev, hci_reset_req, 0, HCI_CMD_TIMEOUT, NULL);
1724                 clear_bit(HCI_INIT, &hdev->flags);
1725         }
1726
1727         /* flush cmd  work */
1728         flush_work(&hdev->cmd_work);
1729
1730         /* Drop queues */
1731         skb_queue_purge(&hdev->rx_q);
1732         skb_queue_purge(&hdev->cmd_q);
1733         skb_queue_purge(&hdev->raw_q);
1734
1735         /* Drop last sent command */
1736         if (hdev->sent_cmd) {
1737                 cancel_delayed_work_sync(&hdev->cmd_timer);
1738                 kfree_skb(hdev->sent_cmd);
1739                 hdev->sent_cmd = NULL;
1740         }
1741
1742         clear_bit(HCI_RUNNING, &hdev->flags);
1743         hci_sock_dev_event(hdev, HCI_DEV_CLOSE);
1744
1745         /* After this point our queues are empty
1746          * and no tasks are scheduled. */
1747         hdev->close(hdev);
1748
1749         /* Clear flags */
1750         hdev->flags &= BIT(HCI_RAW);
1751         hci_dev_clear_volatile_flags(hdev);
1752
1753         /* Controller radio is available but is currently powered down */
1754         hdev->amp_status = AMP_STATUS_POWERED_DOWN;
1755
1756         memset(hdev->eir, 0, sizeof(hdev->eir));
1757         memset(hdev->dev_class, 0, sizeof(hdev->dev_class));
1758         bacpy(&hdev->random_addr, BDADDR_ANY);
1759
1760         hci_req_sync_unlock(hdev);
1761
1762         hci_dev_put(hdev);
1763         return 0;
1764 }
1765
1766 int hci_dev_close(__u16 dev)
1767 {
1768         struct hci_dev *hdev;
1769         int err;
1770
1771         hdev = hci_dev_get(dev);
1772         if (!hdev)
1773                 return -ENODEV;
1774
1775         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1776                 err = -EBUSY;
1777                 goto done;
1778         }
1779
1780         if (hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF))
1781                 cancel_delayed_work(&hdev->power_off);
1782
1783         err = hci_dev_do_close(hdev);
1784
1785 done:
1786         hci_dev_put(hdev);
1787         return err;
1788 }
1789
1790 static int hci_dev_do_reset(struct hci_dev *hdev)
1791 {
1792         int ret;
1793
1794         BT_DBG("%s %p", hdev->name, hdev);
1795
1796         hci_req_sync_lock(hdev);
1797
1798         /* Drop queues */
1799         skb_queue_purge(&hdev->rx_q);
1800         skb_queue_purge(&hdev->cmd_q);
1801
1802         /* Avoid potential lockdep warnings from the *_flush() calls by
1803          * ensuring the workqueue is empty up front.
1804          */
1805         drain_workqueue(hdev->workqueue);
1806
1807         hci_dev_lock(hdev);
1808         hci_inquiry_cache_flush(hdev);
1809         hci_conn_hash_flush(hdev);
1810         hci_dev_unlock(hdev);
1811
1812         if (hdev->flush)
1813                 hdev->flush(hdev);
1814
1815         atomic_set(&hdev->cmd_cnt, 1);
1816         hdev->acl_cnt = 0; hdev->sco_cnt = 0; hdev->le_cnt = 0;
1817
1818         ret = __hci_req_sync(hdev, hci_reset_req, 0, HCI_INIT_TIMEOUT, NULL);
1819
1820         hci_req_sync_unlock(hdev);
1821         return ret;
1822 }
1823
1824 int hci_dev_reset(__u16 dev)
1825 {
1826         struct hci_dev *hdev;
1827         int err;
1828
1829         hdev = hci_dev_get(dev);
1830         if (!hdev)
1831                 return -ENODEV;
1832
1833         if (!test_bit(HCI_UP, &hdev->flags)) {
1834                 err = -ENETDOWN;
1835                 goto done;
1836         }
1837
1838         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1839                 err = -EBUSY;
1840                 goto done;
1841         }
1842
1843         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
1844                 err = -EOPNOTSUPP;
1845                 goto done;
1846         }
1847
1848         err = hci_dev_do_reset(hdev);
1849
1850 done:
1851         hci_dev_put(hdev);
1852         return err;
1853 }
1854
1855 int hci_dev_reset_stat(__u16 dev)
1856 {
1857         struct hci_dev *hdev;
1858         int ret = 0;
1859
1860         hdev = hci_dev_get(dev);
1861         if (!hdev)
1862                 return -ENODEV;
1863
1864         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1865                 ret = -EBUSY;
1866                 goto done;
1867         }
1868
1869         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
1870                 ret = -EOPNOTSUPP;
1871                 goto done;
1872         }
1873
1874         memset(&hdev->stat, 0, sizeof(struct hci_dev_stats));
1875
1876 done:
1877         hci_dev_put(hdev);
1878         return ret;
1879 }
1880
1881 static void hci_update_scan_state(struct hci_dev *hdev, u8 scan)
1882 {
1883         bool conn_changed, discov_changed;
1884
1885         BT_DBG("%s scan 0x%02x", hdev->name, scan);
1886
1887         if ((scan & SCAN_PAGE))
1888                 conn_changed = !hci_dev_test_and_set_flag(hdev,
1889                                                           HCI_CONNECTABLE);
1890         else
1891                 conn_changed = hci_dev_test_and_clear_flag(hdev,
1892                                                            HCI_CONNECTABLE);
1893
1894         if ((scan & SCAN_INQUIRY)) {
1895                 discov_changed = !hci_dev_test_and_set_flag(hdev,
1896                                                             HCI_DISCOVERABLE);
1897         } else {
1898                 hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);
1899                 discov_changed = hci_dev_test_and_clear_flag(hdev,
1900                                                              HCI_DISCOVERABLE);
1901         }
1902
1903         if (!hci_dev_test_flag(hdev, HCI_MGMT))
1904                 return;
1905
1906         if (conn_changed || discov_changed) {
1907                 /* In case this was disabled through mgmt */
1908                 hci_dev_set_flag(hdev, HCI_BREDR_ENABLED);
1909
1910                 if (hci_dev_test_flag(hdev, HCI_LE_ENABLED))
1911                         hci_req_update_adv_data(hdev, hdev->cur_adv_instance);
1912
1913                 mgmt_new_settings(hdev);
1914         }
1915 }
1916
1917 int hci_dev_cmd(unsigned int cmd, void __user *arg)
1918 {
1919         struct hci_dev *hdev;
1920         struct hci_dev_req dr;
1921         int err = 0;
1922
1923         if (copy_from_user(&dr, arg, sizeof(dr)))
1924                 return -EFAULT;
1925
1926         hdev = hci_dev_get(dr.dev_id);
1927         if (!hdev)
1928                 return -ENODEV;
1929
1930         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
1931                 err = -EBUSY;
1932                 goto done;
1933         }
1934
1935         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
1936                 err = -EOPNOTSUPP;
1937                 goto done;
1938         }
1939
1940         if (hdev->dev_type != HCI_PRIMARY) {
1941                 err = -EOPNOTSUPP;
1942                 goto done;
1943         }
1944
1945         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1946                 err = -EOPNOTSUPP;
1947                 goto done;
1948         }
1949
1950         switch (cmd) {
1951         case HCISETAUTH:
1952                 err = hci_req_sync(hdev, hci_auth_req, dr.dev_opt,
1953                                    HCI_INIT_TIMEOUT, NULL);
1954                 break;
1955
1956         case HCISETENCRYPT:
1957                 if (!lmp_encrypt_capable(hdev)) {
1958                         err = -EOPNOTSUPP;
1959                         break;
1960                 }
1961
1962                 if (!test_bit(HCI_AUTH, &hdev->flags)) {
1963                         /* Auth must be enabled first */
1964                         err = hci_req_sync(hdev, hci_auth_req, dr.dev_opt,
1965                                            HCI_INIT_TIMEOUT, NULL);
1966                         if (err)
1967                                 break;
1968                 }
1969
1970                 err = hci_req_sync(hdev, hci_encrypt_req, dr.dev_opt,
1971                                    HCI_INIT_TIMEOUT, NULL);
1972                 break;
1973
1974         case HCISETSCAN:
1975                 err = hci_req_sync(hdev, hci_scan_req, dr.dev_opt,
1976                                    HCI_INIT_TIMEOUT, NULL);
1977
1978                 /* Ensure that the connectable and discoverable states
1979                  * get correctly modified as this was a non-mgmt change.
1980                  */
1981                 if (!err)
1982                         hci_update_scan_state(hdev, dr.dev_opt);
1983                 break;
1984
1985         case HCISETLINKPOL:
1986                 err = hci_req_sync(hdev, hci_linkpol_req, dr.dev_opt,
1987                                    HCI_INIT_TIMEOUT, NULL);
1988                 break;
1989
1990         case HCISETLINKMODE:
1991                 hdev->link_mode = ((__u16) dr.dev_opt) &
1992                                         (HCI_LM_MASTER | HCI_LM_ACCEPT);
1993                 break;
1994
1995         case HCISETPTYPE:
1996                 if (hdev->pkt_type == (__u16) dr.dev_opt)
1997                         break;
1998
1999                 hdev->pkt_type = (__u16) dr.dev_opt;
2000                 mgmt_phy_configuration_changed(hdev, NULL);
2001                 break;
2002
2003         case HCISETACLMTU:
2004                 hdev->acl_mtu  = *((__u16 *) &dr.dev_opt + 1);
2005                 hdev->acl_pkts = *((__u16 *) &dr.dev_opt + 0);
2006                 break;
2007
2008         case HCISETSCOMTU:
2009                 hdev->sco_mtu  = *((__u16 *) &dr.dev_opt + 1);
2010                 hdev->sco_pkts = *((__u16 *) &dr.dev_opt + 0);
2011                 break;
2012
2013         default:
2014                 err = -EINVAL;
2015                 break;
2016         }
2017
2018 done:
2019         hci_dev_put(hdev);
2020         return err;
2021 }
2022
2023 int hci_get_dev_list(void __user *arg)
2024 {
2025         struct hci_dev *hdev;
2026         struct hci_dev_list_req *dl;
2027         struct hci_dev_req *dr;
2028         int n = 0, size, err;
2029         __u16 dev_num;
2030
2031         if (get_user(dev_num, (__u16 __user *) arg))
2032                 return -EFAULT;
2033
2034         if (!dev_num || dev_num > (PAGE_SIZE * 2) / sizeof(*dr))
2035                 return -EINVAL;
2036
2037         size = sizeof(*dl) + dev_num * sizeof(*dr);
2038
2039         dl = kzalloc(size, GFP_KERNEL);
2040         if (!dl)
2041                 return -ENOMEM;
2042
2043         dr = dl->dev_req;
2044
2045         read_lock(&hci_dev_list_lock);
2046         list_for_each_entry(hdev, &hci_dev_list, list) {
2047                 unsigned long flags = hdev->flags;
2048
2049                 /* When the auto-off is configured it means the transport
2050                  * is running, but in that case still indicate that the
2051                  * device is actually down.
2052                  */
2053                 if (hci_dev_test_flag(hdev, HCI_AUTO_OFF))
2054                         flags &= ~BIT(HCI_UP);
2055
2056                 (dr + n)->dev_id  = hdev->id;
2057                 (dr + n)->dev_opt = flags;
2058
2059                 if (++n >= dev_num)
2060                         break;
2061         }
2062         read_unlock(&hci_dev_list_lock);
2063
2064         dl->dev_num = n;
2065         size = sizeof(*dl) + n * sizeof(*dr);
2066
2067         err = copy_to_user(arg, dl, size);
2068         kfree(dl);
2069
2070         return err ? -EFAULT : 0;
2071 }
2072
2073 int hci_get_dev_info(void __user *arg)
2074 {
2075         struct hci_dev *hdev;
2076         struct hci_dev_info di;
2077         unsigned long flags;
2078         int err = 0;
2079
2080         if (copy_from_user(&di, arg, sizeof(di)))
2081                 return -EFAULT;
2082
2083         hdev = hci_dev_get(di.dev_id);
2084         if (!hdev)
2085                 return -ENODEV;
2086
2087         /* When the auto-off is configured it means the transport
2088          * is running, but in that case still indicate that the
2089          * device is actually down.
2090          */
2091         if (hci_dev_test_flag(hdev, HCI_AUTO_OFF))
2092                 flags = hdev->flags & ~BIT(HCI_UP);
2093         else
2094                 flags = hdev->flags;
2095
2096         strcpy(di.name, hdev->name);
2097         di.bdaddr   = hdev->bdaddr;
2098         di.type     = (hdev->bus & 0x0f) | ((hdev->dev_type & 0x03) << 4);
2099         di.flags    = flags;
2100         di.pkt_type = hdev->pkt_type;
2101         if (lmp_bredr_capable(hdev)) {
2102                 di.acl_mtu  = hdev->acl_mtu;
2103                 di.acl_pkts = hdev->acl_pkts;
2104                 di.sco_mtu  = hdev->sco_mtu;
2105                 di.sco_pkts = hdev->sco_pkts;
2106         } else {
2107                 di.acl_mtu  = hdev->le_mtu;
2108                 di.acl_pkts = hdev->le_pkts;
2109                 di.sco_mtu  = 0;
2110                 di.sco_pkts = 0;
2111         }
2112         di.link_policy = hdev->link_policy;
2113         di.link_mode   = hdev->link_mode;
2114
2115         memcpy(&di.stat, &hdev->stat, sizeof(di.stat));
2116         memcpy(&di.features, &hdev->features, sizeof(di.features));
2117
2118         if (copy_to_user(arg, &di, sizeof(di)))
2119                 err = -EFAULT;
2120
2121         hci_dev_put(hdev);
2122
2123         return err;
2124 }
2125
2126 /* ---- Interface to HCI drivers ---- */
2127
2128 static int hci_rfkill_set_block(void *data, bool blocked)
2129 {
2130         struct hci_dev *hdev = data;
2131
2132         BT_DBG("%p name %s blocked %d", hdev, hdev->name, blocked);
2133
2134         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
2135                 return -EBUSY;
2136
2137         if (blocked) {
2138                 hci_dev_set_flag(hdev, HCI_RFKILLED);
2139                 if (!hci_dev_test_flag(hdev, HCI_SETUP) &&
2140                     !hci_dev_test_flag(hdev, HCI_CONFIG))
2141                         hci_dev_do_close(hdev);
2142         } else {
2143                 hci_dev_clear_flag(hdev, HCI_RFKILLED);
2144         }
2145
2146         return 0;
2147 }
2148
2149 static const struct rfkill_ops hci_rfkill_ops = {
2150         .set_block = hci_rfkill_set_block,
2151 };
2152
2153 static void hci_power_on(struct work_struct *work)
2154 {
2155         struct hci_dev *hdev = container_of(work, struct hci_dev, power_on);
2156         int err;
2157
2158         BT_DBG("%s", hdev->name);
2159
2160         if (test_bit(HCI_UP, &hdev->flags) &&
2161             hci_dev_test_flag(hdev, HCI_MGMT) &&
2162             hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF)) {
2163                 cancel_delayed_work(&hdev->power_off);
2164                 hci_req_sync_lock(hdev);
2165                 err = __hci_req_hci_power_on(hdev);
2166                 hci_req_sync_unlock(hdev);
2167                 mgmt_power_on(hdev, err);
2168                 return;
2169         }
2170
2171         err = hci_dev_do_open(hdev);
2172         if (err < 0) {
2173                 hci_dev_lock(hdev);
2174                 mgmt_set_powered_failed(hdev, err);
2175                 hci_dev_unlock(hdev);
2176                 return;
2177         }
2178
2179         /* During the HCI setup phase, a few error conditions are
2180          * ignored and they need to be checked now. If they are still
2181          * valid, it is important to turn the device back off.
2182          */
2183         if (hci_dev_test_flag(hdev, HCI_RFKILLED) ||
2184             hci_dev_test_flag(hdev, HCI_UNCONFIGURED) ||
2185             (hdev->dev_type == HCI_PRIMARY &&
2186              !bacmp(&hdev->bdaddr, BDADDR_ANY) &&
2187              !bacmp(&hdev->static_addr, BDADDR_ANY))) {
2188                 hci_dev_clear_flag(hdev, HCI_AUTO_OFF);
2189                 hci_dev_do_close(hdev);
2190         } else if (hci_dev_test_flag(hdev, HCI_AUTO_OFF)) {
2191                 queue_delayed_work(hdev->req_workqueue, &hdev->power_off,
2192                                    HCI_AUTO_OFF_TIMEOUT);
2193         }
2194
2195         if (hci_dev_test_and_clear_flag(hdev, HCI_SETUP)) {
2196                 /* For unconfigured devices, set the HCI_RAW flag
2197                  * so that userspace can easily identify them.
2198                  */
2199                 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
2200                         set_bit(HCI_RAW, &hdev->flags);
2201
2202                 /* For fully configured devices, this will send
2203                  * the Index Added event. For unconfigured devices,
2204                  * it will send Unconfigued Index Added event.
2205                  *
2206                  * Devices with HCI_QUIRK_RAW_DEVICE are ignored
2207                  * and no event will be send.
2208                  */
2209                 mgmt_index_added(hdev);
2210         } else if (hci_dev_test_and_clear_flag(hdev, HCI_CONFIG)) {
2211                 /* When the controller is now configured, then it
2212                  * is important to clear the HCI_RAW flag.
2213                  */
2214                 if (!hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
2215                         clear_bit(HCI_RAW, &hdev->flags);
2216
2217                 /* Powering on the controller with HCI_CONFIG set only
2218                  * happens with the transition from unconfigured to
2219                  * configured. This will send the Index Added event.
2220                  */
2221                 mgmt_index_added(hdev);
2222         }
2223 }
2224
2225 static void hci_power_off(struct work_struct *work)
2226 {
2227         struct hci_dev *hdev = container_of(work, struct hci_dev,
2228                                             power_off.work);
2229
2230         BT_DBG("%s", hdev->name);
2231
2232         hci_dev_do_close(hdev);
2233 }
2234
2235 static void hci_error_reset(struct work_struct *work)
2236 {
2237         struct hci_dev *hdev = container_of(work, struct hci_dev, error_reset);
2238
2239         BT_DBG("%s", hdev->name);
2240
2241         if (hdev->hw_error)
2242                 hdev->hw_error(hdev, hdev->hw_error_code);
2243         else
2244                 bt_dev_err(hdev, "hardware error 0x%2.2x", hdev->hw_error_code);
2245
2246         if (hci_dev_do_close(hdev))
2247                 return;
2248
2249         hci_dev_do_open(hdev);
2250 }
2251
2252 void hci_uuids_clear(struct hci_dev *hdev)
2253 {
2254         struct bt_uuid *uuid, *tmp;
2255
2256         list_for_each_entry_safe(uuid, tmp, &hdev->uuids, list) {
2257                 list_del(&uuid->list);
2258                 kfree(uuid);
2259         }
2260 }
2261
2262 void hci_link_keys_clear(struct hci_dev *hdev)
2263 {
2264         struct link_key *key;
2265
2266         list_for_each_entry_rcu(key, &hdev->link_keys, list) {
2267                 list_del_rcu(&key->list);
2268                 kfree_rcu(key, rcu);
2269         }
2270 }
2271
2272 void hci_smp_ltks_clear(struct hci_dev *hdev)
2273 {
2274         struct smp_ltk *k;
2275
2276         list_for_each_entry_rcu(k, &hdev->long_term_keys, list) {
2277                 list_del_rcu(&k->list);
2278                 kfree_rcu(k, rcu);
2279         }
2280 }
2281
2282 void hci_smp_irks_clear(struct hci_dev *hdev)
2283 {
2284         struct smp_irk *k;
2285
2286         list_for_each_entry_rcu(k, &hdev->identity_resolving_keys, list) {
2287                 list_del_rcu(&k->list);
2288                 kfree_rcu(k, rcu);
2289         }
2290 }
2291
2292 struct link_key *hci_find_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)
2293 {
2294         struct link_key *k;
2295
2296         rcu_read_lock();
2297         list_for_each_entry_rcu(k, &hdev->link_keys, list) {
2298                 if (bacmp(bdaddr, &k->bdaddr) == 0) {
2299                         rcu_read_unlock();
2300                         return k;
2301                 }
2302         }
2303         rcu_read_unlock();
2304
2305         return NULL;
2306 }
2307
2308 static bool hci_persistent_key(struct hci_dev *hdev, struct hci_conn *conn,
2309                                u8 key_type, u8 old_key_type)
2310 {
2311         /* Legacy key */
2312         if (key_type < 0x03)
2313                 return true;
2314
2315         /* Debug keys are insecure so don't store them persistently */
2316         if (key_type == HCI_LK_DEBUG_COMBINATION)
2317                 return false;
2318
2319         /* Changed combination key and there's no previous one */
2320         if (key_type == HCI_LK_CHANGED_COMBINATION && old_key_type == 0xff)
2321                 return false;
2322
2323         /* Security mode 3 case */
2324         if (!conn)
2325                 return true;
2326
2327         /* BR/EDR key derived using SC from an LE link */
2328         if (conn->type == LE_LINK)
2329                 return true;
2330
2331         /* Neither local nor remote side had no-bonding as requirement */
2332         if (conn->auth_type > 0x01 && conn->remote_auth > 0x01)
2333                 return true;
2334
2335         /* Local side had dedicated bonding as requirement */
2336         if (conn->auth_type == 0x02 || conn->auth_type == 0x03)
2337                 return true;
2338
2339         /* Remote side had dedicated bonding as requirement */
2340         if (conn->remote_auth == 0x02 || conn->remote_auth == 0x03)
2341                 return true;
2342
2343         /* If none of the above criteria match, then don't store the key
2344          * persistently */
2345         return false;
2346 }
2347
2348 static u8 ltk_role(u8 type)
2349 {
2350         if (type == SMP_LTK)
2351                 return HCI_ROLE_MASTER;
2352
2353         return HCI_ROLE_SLAVE;
2354 }
2355
2356 struct smp_ltk *hci_find_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr,
2357                              u8 addr_type, u8 role)
2358 {
2359         struct smp_ltk *k;
2360
2361         rcu_read_lock();
2362         list_for_each_entry_rcu(k, &hdev->long_term_keys, list) {
2363                 if (addr_type != k->bdaddr_type || bacmp(bdaddr, &k->bdaddr))
2364                         continue;
2365
2366                 if (smp_ltk_is_sc(k) || ltk_role(k->type) == role) {
2367                         rcu_read_unlock();
2368                         return k;
2369                 }
2370         }
2371         rcu_read_unlock();
2372
2373         return NULL;
2374 }
2375
2376 struct smp_irk *hci_find_irk_by_rpa(struct hci_dev *hdev, bdaddr_t *rpa)
2377 {
2378         struct smp_irk *irk;
2379
2380         rcu_read_lock();
2381         list_for_each_entry_rcu(irk, &hdev->identity_resolving_keys, list) {
2382                 if (!bacmp(&irk->rpa, rpa)) {
2383                         rcu_read_unlock();
2384                         return irk;
2385                 }
2386         }
2387
2388         list_for_each_entry_rcu(irk, &hdev->identity_resolving_keys, list) {
2389                 if (smp_irk_matches(hdev, irk->val, rpa)) {
2390                         bacpy(&irk->rpa, rpa);
2391                         rcu_read_unlock();
2392                         return irk;
2393                 }
2394         }
2395         rcu_read_unlock();
2396
2397         return NULL;
2398 }
2399
2400 struct smp_irk *hci_find_irk_by_addr(struct hci_dev *hdev, bdaddr_t *bdaddr,
2401                                      u8 addr_type)
2402 {
2403         struct smp_irk *irk;
2404
2405         /* Identity Address must be public or static random */
2406         if (addr_type == ADDR_LE_DEV_RANDOM && (bdaddr->b[5] & 0xc0) != 0xc0)
2407                 return NULL;
2408
2409         rcu_read_lock();
2410         list_for_each_entry_rcu(irk, &hdev->identity_resolving_keys, list) {
2411                 if (addr_type == irk->addr_type &&
2412                     bacmp(bdaddr, &irk->bdaddr) == 0) {
2413                         rcu_read_unlock();
2414                         return irk;
2415                 }
2416         }
2417         rcu_read_unlock();
2418
2419         return NULL;
2420 }
2421
2422 struct link_key *hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn,
2423                                   bdaddr_t *bdaddr, u8 *val, u8 type,
2424                                   u8 pin_len, bool *persistent)
2425 {
2426         struct link_key *key, *old_key;
2427         u8 old_key_type;
2428
2429         old_key = hci_find_link_key(hdev, bdaddr);
2430         if (old_key) {
2431                 old_key_type = old_key->type;
2432                 key = old_key;
2433         } else {
2434                 old_key_type = conn ? conn->key_type : 0xff;
2435                 key = kzalloc(sizeof(*key), GFP_KERNEL);
2436                 if (!key)
2437                         return NULL;
2438                 list_add_rcu(&key->list, &hdev->link_keys);
2439         }
2440
2441         BT_DBG("%s key for %pMR type %u", hdev->name, bdaddr, type);
2442
2443         /* Some buggy controller combinations generate a changed
2444          * combination key for legacy pairing even when there's no
2445          * previous key */
2446         if (type == HCI_LK_CHANGED_COMBINATION &&
2447             (!conn || conn->remote_auth == 0xff) && old_key_type == 0xff) {
2448                 type = HCI_LK_COMBINATION;
2449                 if (conn)
2450                         conn->key_type = type;
2451         }
2452
2453         bacpy(&key->bdaddr, bdaddr);
2454         memcpy(key->val, val, HCI_LINK_KEY_SIZE);
2455         key->pin_len = pin_len;
2456
2457         if (type == HCI_LK_CHANGED_COMBINATION)
2458                 key->type = old_key_type;
2459         else
2460                 key->type = type;
2461
2462         if (persistent)
2463                 *persistent = hci_persistent_key(hdev, conn, type,
2464                                                  old_key_type);
2465
2466         return key;
2467 }
2468
2469 struct smp_ltk *hci_add_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr,
2470                             u8 addr_type, u8 type, u8 authenticated,
2471                             u8 tk[16], u8 enc_size, __le16 ediv, __le64 rand)
2472 {
2473         struct smp_ltk *key, *old_key;
2474         u8 role = ltk_role(type);
2475
2476         old_key = hci_find_ltk(hdev, bdaddr, addr_type, role);
2477         if (old_key)
2478                 key = old_key;
2479         else {
2480                 key = kzalloc(sizeof(*key), GFP_KERNEL);
2481                 if (!key)
2482                         return NULL;
2483                 list_add_rcu(&key->list, &hdev->long_term_keys);
2484         }
2485
2486         bacpy(&key->bdaddr, bdaddr);
2487         key->bdaddr_type = addr_type;
2488         memcpy(key->val, tk, sizeof(key->val));
2489         key->authenticated = authenticated;
2490         key->ediv = ediv;
2491         key->rand = rand;
2492         key->enc_size = enc_size;
2493         key->type = type;
2494
2495         return key;
2496 }
2497
2498 struct smp_irk *hci_add_irk(struct hci_dev *hdev, bdaddr_t *bdaddr,
2499                             u8 addr_type, u8 val[16], bdaddr_t *rpa)
2500 {
2501         struct smp_irk *irk;
2502
2503         irk = hci_find_irk_by_addr(hdev, bdaddr, addr_type);
2504         if (!irk) {
2505                 irk = kzalloc(sizeof(*irk), GFP_KERNEL);
2506                 if (!irk)
2507                         return NULL;
2508
2509                 bacpy(&irk->bdaddr, bdaddr);
2510                 irk->addr_type = addr_type;
2511
2512                 list_add_rcu(&irk->list, &hdev->identity_resolving_keys);
2513         }
2514
2515         memcpy(irk->val, val, 16);
2516         bacpy(&irk->rpa, rpa);
2517
2518         return irk;
2519 }
2520
2521 int hci_remove_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)
2522 {
2523         struct link_key *key;
2524
2525         key = hci_find_link_key(hdev, bdaddr);
2526         if (!key)
2527                 return -ENOENT;
2528
2529         BT_DBG("%s removing %pMR", hdev->name, bdaddr);
2530
2531         list_del_rcu(&key->list);
2532         kfree_rcu(key, rcu);
2533
2534         return 0;
2535 }
2536
2537 int hci_remove_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 bdaddr_type)
2538 {
2539         struct smp_ltk *k;
2540         int removed = 0;
2541
2542         list_for_each_entry_rcu(k, &hdev->long_term_keys, list) {
2543                 if (bacmp(bdaddr, &k->bdaddr) || k->bdaddr_type != bdaddr_type)
2544                         continue;
2545
2546                 BT_DBG("%s removing %pMR", hdev->name, bdaddr);
2547
2548                 list_del_rcu(&k->list);
2549                 kfree_rcu(k, rcu);
2550                 removed++;
2551         }
2552
2553         return removed ? 0 : -ENOENT;
2554 }
2555
2556 void hci_remove_irk(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 addr_type)
2557 {
2558         struct smp_irk *k;
2559
2560         list_for_each_entry_rcu(k, &hdev->identity_resolving_keys, list) {
2561                 if (bacmp(bdaddr, &k->bdaddr) || k->addr_type != addr_type)
2562                         continue;
2563
2564                 BT_DBG("%s removing %pMR", hdev->name, bdaddr);
2565
2566                 list_del_rcu(&k->list);
2567                 kfree_rcu(k, rcu);
2568         }
2569 }
2570
2571 bool hci_bdaddr_is_paired(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
2572 {
2573         struct smp_ltk *k;
2574         struct smp_irk *irk;
2575         u8 addr_type;
2576
2577         if (type == BDADDR_BREDR) {
2578                 if (hci_find_link_key(hdev, bdaddr))
2579                         return true;
2580                 return false;
2581         }
2582
2583         /* Convert to HCI addr type which struct smp_ltk uses */
2584         if (type == BDADDR_LE_PUBLIC)
2585                 addr_type = ADDR_LE_DEV_PUBLIC;
2586         else
2587                 addr_type = ADDR_LE_DEV_RANDOM;
2588
2589         irk = hci_get_irk(hdev, bdaddr, addr_type);
2590         if (irk) {
2591                 bdaddr = &irk->bdaddr;
2592                 addr_type = irk->addr_type;
2593         }
2594
2595         rcu_read_lock();
2596         list_for_each_entry_rcu(k, &hdev->long_term_keys, list) {
2597                 if (k->bdaddr_type == addr_type && !bacmp(bdaddr, &k->bdaddr)) {
2598                         rcu_read_unlock();
2599                         return true;
2600                 }
2601         }
2602         rcu_read_unlock();
2603
2604         return false;
2605 }
2606
2607 /* HCI command timer function */
2608 static void hci_cmd_timeout(struct work_struct *work)
2609 {
2610         struct hci_dev *hdev = container_of(work, struct hci_dev,
2611                                             cmd_timer.work);
2612
2613         if (hdev->sent_cmd) {
2614                 struct hci_command_hdr *sent = (void *) hdev->sent_cmd->data;
2615                 u16 opcode = __le16_to_cpu(sent->opcode);
2616
2617                 bt_dev_err(hdev, "command 0x%4.4x tx timeout", opcode);
2618         } else {
2619                 bt_dev_err(hdev, "command tx timeout");
2620         }
2621
2622         if (hdev->cmd_timeout)
2623                 hdev->cmd_timeout(hdev);
2624
2625         atomic_set(&hdev->cmd_cnt, 1);
2626         queue_work(hdev->workqueue, &hdev->cmd_work);
2627 }
2628
2629 struct oob_data *hci_find_remote_oob_data(struct hci_dev *hdev,
2630                                           bdaddr_t *bdaddr, u8 bdaddr_type)
2631 {
2632         struct oob_data *data;
2633
2634         list_for_each_entry(data, &hdev->remote_oob_data, list) {
2635                 if (bacmp(bdaddr, &data->bdaddr) != 0)
2636                         continue;
2637                 if (data->bdaddr_type != bdaddr_type)
2638                         continue;
2639                 return data;
2640         }
2641
2642         return NULL;
2643 }
2644
2645 int hci_remove_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr,
2646                                u8 bdaddr_type)
2647 {
2648         struct oob_data *data;
2649
2650         data = hci_find_remote_oob_data(hdev, bdaddr, bdaddr_type);
2651         if (!data)
2652                 return -ENOENT;
2653
2654         BT_DBG("%s removing %pMR (%u)", hdev->name, bdaddr, bdaddr_type);
2655
2656         list_del(&data->list);
2657         kfree(data);
2658
2659         return 0;
2660 }
2661
2662 void hci_remote_oob_data_clear(struct hci_dev *hdev)
2663 {
2664         struct oob_data *data, *n;
2665
2666         list_for_each_entry_safe(data, n, &hdev->remote_oob_data, list) {
2667                 list_del(&data->list);
2668                 kfree(data);
2669         }
2670 }
2671
2672 int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr,
2673                             u8 bdaddr_type, u8 *hash192, u8 *rand192,
2674                             u8 *hash256, u8 *rand256)
2675 {
2676         struct oob_data *data;
2677
2678         data = hci_find_remote_oob_data(hdev, bdaddr, bdaddr_type);
2679         if (!data) {
2680                 data = kmalloc(sizeof(*data), GFP_KERNEL);
2681                 if (!data)
2682                         return -ENOMEM;
2683
2684                 bacpy(&data->bdaddr, bdaddr);
2685                 data->bdaddr_type = bdaddr_type;
2686                 list_add(&data->list, &hdev->remote_oob_data);
2687         }
2688
2689         if (hash192 && rand192) {
2690                 memcpy(data->hash192, hash192, sizeof(data->hash192));
2691                 memcpy(data->rand192, rand192, sizeof(data->rand192));
2692                 if (hash256 && rand256)
2693                         data->present = 0x03;
2694         } else {
2695                 memset(data->hash192, 0, sizeof(data->hash192));
2696                 memset(data->rand192, 0, sizeof(data->rand192));
2697                 if (hash256 && rand256)
2698                         data->present = 0x02;
2699                 else
2700                         data->present = 0x00;
2701         }
2702
2703         if (hash256 && rand256) {
2704                 memcpy(data->hash256, hash256, sizeof(data->hash256));
2705                 memcpy(data->rand256, rand256, sizeof(data->rand256));
2706         } else {
2707                 memset(data->hash256, 0, sizeof(data->hash256));
2708                 memset(data->rand256, 0, sizeof(data->rand256));
2709                 if (hash192 && rand192)
2710                         data->present = 0x01;
2711         }
2712
2713         BT_DBG("%s for %pMR", hdev->name, bdaddr);
2714
2715         return 0;
2716 }
2717
2718 /* This function requires the caller holds hdev->lock */
2719 struct adv_info *hci_find_adv_instance(struct hci_dev *hdev, u8 instance)
2720 {
2721         struct adv_info *adv_instance;
2722
2723         list_for_each_entry(adv_instance, &hdev->adv_instances, list) {
2724                 if (adv_instance->instance == instance)
2725                         return adv_instance;
2726         }
2727
2728         return NULL;
2729 }
2730
2731 /* This function requires the caller holds hdev->lock */
2732 struct adv_info *hci_get_next_instance(struct hci_dev *hdev, u8 instance)
2733 {
2734         struct adv_info *cur_instance;
2735
2736         cur_instance = hci_find_adv_instance(hdev, instance);
2737         if (!cur_instance)
2738                 return NULL;
2739
2740         if (cur_instance == list_last_entry(&hdev->adv_instances,
2741                                             struct adv_info, list))
2742                 return list_first_entry(&hdev->adv_instances,
2743                                                  struct adv_info, list);
2744         else
2745                 return list_next_entry(cur_instance, list);
2746 }
2747
2748 /* This function requires the caller holds hdev->lock */
2749 int hci_remove_adv_instance(struct hci_dev *hdev, u8 instance)
2750 {
2751         struct adv_info *adv_instance;
2752
2753         adv_instance = hci_find_adv_instance(hdev, instance);
2754         if (!adv_instance)
2755                 return -ENOENT;
2756
2757         BT_DBG("%s removing %dMR", hdev->name, instance);
2758
2759         if (hdev->cur_adv_instance == instance) {
2760                 if (hdev->adv_instance_timeout) {
2761                         cancel_delayed_work(&hdev->adv_instance_expire);
2762                         hdev->adv_instance_timeout = 0;
2763                 }
2764                 hdev->cur_adv_instance = 0x00;
2765         }
2766
2767         cancel_delayed_work_sync(&adv_instance->rpa_expired_cb);
2768
2769         list_del(&adv_instance->list);
2770         kfree(adv_instance);
2771
2772         hdev->adv_instance_cnt--;
2773
2774         return 0;
2775 }
2776
2777 void hci_adv_instances_set_rpa_expired(struct hci_dev *hdev, bool rpa_expired)
2778 {
2779         struct adv_info *adv_instance, *n;
2780
2781         list_for_each_entry_safe(adv_instance, n, &hdev->adv_instances, list)
2782                 adv_instance->rpa_expired = rpa_expired;
2783 }
2784
2785 /* This function requires the caller holds hdev->lock */
2786 void hci_adv_instances_clear(struct hci_dev *hdev)
2787 {
2788         struct adv_info *adv_instance, *n;
2789
2790         if (hdev->adv_instance_timeout) {
2791                 cancel_delayed_work(&hdev->adv_instance_expire);
2792                 hdev->adv_instance_timeout = 0;
2793         }
2794
2795         list_for_each_entry_safe(adv_instance, n, &hdev->adv_instances, list) {
2796                 cancel_delayed_work_sync(&adv_instance->rpa_expired_cb);
2797                 list_del(&adv_instance->list);
2798                 kfree(adv_instance);
2799         }
2800
2801         hdev->adv_instance_cnt = 0;
2802         hdev->cur_adv_instance = 0x00;
2803 }
2804
2805 static void adv_instance_rpa_expired(struct work_struct *work)
2806 {
2807         struct adv_info *adv_instance = container_of(work, struct adv_info,
2808                                                      rpa_expired_cb.work);
2809
2810         BT_DBG("");
2811
2812         adv_instance->rpa_expired = true;
2813 }
2814
2815 /* This function requires the caller holds hdev->lock */
2816 int hci_add_adv_instance(struct hci_dev *hdev, u8 instance, u32 flags,
2817                          u16 adv_data_len, u8 *adv_data,
2818                          u16 scan_rsp_len, u8 *scan_rsp_data,
2819                          u16 timeout, u16 duration)
2820 {
2821         struct adv_info *adv_instance;
2822
2823         adv_instance = hci_find_adv_instance(hdev, instance);
2824         if (adv_instance) {
2825                 memset(adv_instance->adv_data, 0,
2826                        sizeof(adv_instance->adv_data));
2827                 memset(adv_instance->scan_rsp_data, 0,
2828                        sizeof(adv_instance->scan_rsp_data));
2829         } else {
2830                 if (hdev->adv_instance_cnt >= hdev->le_num_of_adv_sets ||
2831                     instance < 1 || instance > HCI_MAX_ADV_INSTANCES)
2832                         return -EOVERFLOW;
2833
2834                 adv_instance = kzalloc(sizeof(*adv_instance), GFP_KERNEL);
2835                 if (!adv_instance)
2836                         return -ENOMEM;
2837
2838                 adv_instance->pending = true;
2839                 adv_instance->instance = instance;
2840                 list_add(&adv_instance->list, &hdev->adv_instances);
2841                 hdev->adv_instance_cnt++;
2842         }
2843
2844         adv_instance->flags = flags;
2845         adv_instance->adv_data_len = adv_data_len;
2846         adv_instance->scan_rsp_len = scan_rsp_len;
2847
2848         if (adv_data_len)
2849                 memcpy(adv_instance->adv_data, adv_data, adv_data_len);
2850
2851         if (scan_rsp_len)
2852                 memcpy(adv_instance->scan_rsp_data,
2853                        scan_rsp_data, scan_rsp_len);
2854
2855         adv_instance->timeout = timeout;
2856         adv_instance->remaining_time = timeout;
2857
2858         if (duration == 0)
2859                 adv_instance->duration = HCI_DEFAULT_ADV_DURATION;
2860         else
2861                 adv_instance->duration = duration;
2862
2863         adv_instance->tx_power = HCI_TX_POWER_INVALID;
2864
2865         INIT_DELAYED_WORK(&adv_instance->rpa_expired_cb,
2866                           adv_instance_rpa_expired);
2867
2868         BT_DBG("%s for %dMR", hdev->name, instance);
2869
2870         return 0;
2871 }
2872
2873 struct bdaddr_list *hci_bdaddr_list_lookup(struct list_head *bdaddr_list,
2874                                          bdaddr_t *bdaddr, u8 type)
2875 {
2876         struct bdaddr_list *b;
2877
2878         list_for_each_entry(b, bdaddr_list, list) {
2879                 if (!bacmp(&b->bdaddr, bdaddr) && b->bdaddr_type == type)
2880                         return b;
2881         }
2882
2883         return NULL;
2884 }
2885
2886 struct bdaddr_list_with_irk *hci_bdaddr_list_lookup_with_irk(
2887                                 struct list_head *bdaddr_list, bdaddr_t *bdaddr,
2888                                 u8 type)
2889 {
2890         struct bdaddr_list_with_irk *b;
2891
2892         list_for_each_entry(b, bdaddr_list, list) {
2893                 if (!bacmp(&b->bdaddr, bdaddr) && b->bdaddr_type == type)
2894                         return b;
2895         }
2896
2897         return NULL;
2898 }
2899
2900 void hci_bdaddr_list_clear(struct list_head *bdaddr_list)
2901 {
2902         struct bdaddr_list *b, *n;
2903
2904         list_for_each_entry_safe(b, n, bdaddr_list, list) {
2905                 list_del(&b->list);
2906                 kfree(b);
2907         }
2908 }
2909
2910 int hci_bdaddr_list_add(struct list_head *list, bdaddr_t *bdaddr, u8 type)
2911 {
2912         struct bdaddr_list *entry;
2913
2914         if (!bacmp(bdaddr, BDADDR_ANY))
2915                 return -EBADF;
2916
2917         if (hci_bdaddr_list_lookup(list, bdaddr, type))
2918                 return -EEXIST;
2919
2920         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
2921         if (!entry)
2922                 return -ENOMEM;
2923
2924         bacpy(&entry->bdaddr, bdaddr);
2925         entry->bdaddr_type = type;
2926
2927         list_add(&entry->list, list);
2928
2929         return 0;
2930 }
2931
2932 int hci_bdaddr_list_add_with_irk(struct list_head *list, bdaddr_t *bdaddr,
2933                                         u8 type, u8 *peer_irk, u8 *local_irk)
2934 {
2935         struct bdaddr_list_with_irk *entry;
2936
2937         if (!bacmp(bdaddr, BDADDR_ANY))
2938                 return -EBADF;
2939
2940         if (hci_bdaddr_list_lookup(list, bdaddr, type))
2941                 return -EEXIST;
2942
2943         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
2944         if (!entry)
2945                 return -ENOMEM;
2946
2947         bacpy(&entry->bdaddr, bdaddr);
2948         entry->bdaddr_type = type;
2949
2950         if (peer_irk)
2951                 memcpy(entry->peer_irk, peer_irk, 16);
2952
2953         if (local_irk)
2954                 memcpy(entry->local_irk, local_irk, 16);
2955
2956         list_add(&entry->list, list);
2957
2958         return 0;
2959 }
2960
2961 int hci_bdaddr_list_del(struct list_head *list, bdaddr_t *bdaddr, u8 type)
2962 {
2963         struct bdaddr_list *entry;
2964
2965         if (!bacmp(bdaddr, BDADDR_ANY)) {
2966                 hci_bdaddr_list_clear(list);
2967                 return 0;
2968         }
2969
2970         entry = hci_bdaddr_list_lookup(list, bdaddr, type);
2971         if (!entry)
2972                 return -ENOENT;
2973
2974         list_del(&entry->list);
2975         kfree(entry);
2976
2977         return 0;
2978 }
2979
2980 int hci_bdaddr_list_del_with_irk(struct list_head *list, bdaddr_t *bdaddr,
2981                                                         u8 type)
2982 {
2983         struct bdaddr_list_with_irk *entry;
2984
2985         if (!bacmp(bdaddr, BDADDR_ANY)) {
2986                 hci_bdaddr_list_clear(list);
2987                 return 0;
2988         }
2989
2990         entry = hci_bdaddr_list_lookup_with_irk(list, bdaddr, type);
2991         if (!entry)
2992                 return -ENOENT;
2993
2994         list_del(&entry->list);
2995         kfree(entry);
2996
2997         return 0;
2998 }
2999
3000 /* This function requires the caller holds hdev->lock */
3001 struct hci_conn_params *hci_conn_params_lookup(struct hci_dev *hdev,
3002                                                bdaddr_t *addr, u8 addr_type)
3003 {
3004         struct hci_conn_params *params;
3005
3006         list_for_each_entry(params, &hdev->le_conn_params, list) {
3007                 if (bacmp(&params->addr, addr) == 0 &&
3008                     params->addr_type == addr_type) {
3009                         return params;
3010                 }
3011         }
3012
3013         return NULL;
3014 }
3015
3016 /* This function requires the caller holds hdev->lock */
3017 struct hci_conn_params *hci_pend_le_action_lookup(struct list_head *list,
3018                                                   bdaddr_t *addr, u8 addr_type)
3019 {
3020         struct hci_conn_params *param;
3021
3022         list_for_each_entry(param, list, action) {
3023                 if (bacmp(&param->addr, addr) == 0 &&
3024                     param->addr_type == addr_type)
3025                         return param;
3026         }
3027
3028         return NULL;
3029 }
3030
3031 /* This function requires the caller holds hdev->lock */
3032 struct hci_conn_params *hci_conn_params_add(struct hci_dev *hdev,
3033                                             bdaddr_t *addr, u8 addr_type)
3034 {
3035         struct hci_conn_params *params;
3036
3037         params = hci_conn_params_lookup(hdev, addr, addr_type);
3038         if (params)
3039                 return params;
3040
3041         params = kzalloc(sizeof(*params), GFP_KERNEL);
3042         if (!params) {
3043                 bt_dev_err(hdev, "out of memory");
3044                 return NULL;
3045         }
3046
3047         bacpy(&params->addr, addr);
3048         params->addr_type = addr_type;
3049
3050         list_add(&params->list, &hdev->le_conn_params);
3051         INIT_LIST_HEAD(&params->action);
3052
3053         params->conn_min_interval = hdev->le_conn_min_interval;
3054         params->conn_max_interval = hdev->le_conn_max_interval;
3055         params->conn_latency = hdev->le_conn_latency;
3056         params->supervision_timeout = hdev->le_supv_timeout;
3057         params->auto_connect = HCI_AUTO_CONN_DISABLED;
3058
3059         BT_DBG("addr %pMR (type %u)", addr, addr_type);
3060
3061         return params;
3062 }
3063
3064 static void hci_conn_params_free(struct hci_conn_params *params)
3065 {
3066         if (params->conn) {
3067                 hci_conn_drop(params->conn);
3068                 hci_conn_put(params->conn);
3069         }
3070
3071         list_del(&params->action);
3072         list_del(&params->list);
3073         kfree(params);
3074 }
3075
3076 /* This function requires the caller holds hdev->lock */
3077 void hci_conn_params_del(struct hci_dev *hdev, bdaddr_t *addr, u8 addr_type)
3078 {
3079         struct hci_conn_params *params;
3080
3081         params = hci_conn_params_lookup(hdev, addr, addr_type);
3082         if (!params)
3083                 return;
3084
3085         hci_conn_params_free(params);
3086
3087         hci_update_background_scan(hdev);
3088
3089         BT_DBG("addr %pMR (type %u)", addr, addr_type);
3090 }
3091
3092 /* This function requires the caller holds hdev->lock */
3093 void hci_conn_params_clear_disabled(struct hci_dev *hdev)
3094 {
3095         struct hci_conn_params *params, *tmp;
3096
3097         list_for_each_entry_safe(params, tmp, &hdev->le_conn_params, list) {
3098                 if (params->auto_connect != HCI_AUTO_CONN_DISABLED)
3099                         continue;
3100
3101                 /* If trying to estabilish one time connection to disabled
3102                  * device, leave the params, but mark them as just once.
3103                  */
3104                 if (params->explicit_connect) {
3105                         params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
3106                         continue;
3107                 }
3108
3109                 list_del(&params->list);
3110                 kfree(params);
3111         }
3112
3113         BT_DBG("All LE disabled connection parameters were removed");
3114 }
3115
3116 /* This function requires the caller holds hdev->lock */
3117 static void hci_conn_params_clear_all(struct hci_dev *hdev)
3118 {
3119         struct hci_conn_params *params, *tmp;
3120
3121         list_for_each_entry_safe(params, tmp, &hdev->le_conn_params, list)
3122                 hci_conn_params_free(params);
3123
3124         BT_DBG("All LE connection parameters were removed");
3125 }
3126
3127 /* Copy the Identity Address of the controller.
3128  *
3129  * If the controller has a public BD_ADDR, then by default use that one.
3130  * If this is a LE only controller without a public address, default to
3131  * the static random address.
3132  *
3133  * For debugging purposes it is possible to force controllers with a
3134  * public address to use the static random address instead.
3135  *
3136  * In case BR/EDR has been disabled on a dual-mode controller and
3137  * userspace has configured a static address, then that address
3138  * becomes the identity address instead of the public BR/EDR address.
3139  */
3140 void hci_copy_identity_address(struct hci_dev *hdev, bdaddr_t *bdaddr,
3141                                u8 *bdaddr_type)
3142 {
3143         if (hci_dev_test_flag(hdev, HCI_FORCE_STATIC_ADDR) ||
3144             !bacmp(&hdev->bdaddr, BDADDR_ANY) ||
3145             (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED) &&
3146              bacmp(&hdev->static_addr, BDADDR_ANY))) {
3147                 bacpy(bdaddr, &hdev->static_addr);
3148                 *bdaddr_type = ADDR_LE_DEV_RANDOM;
3149         } else {
3150                 bacpy(bdaddr, &hdev->bdaddr);
3151                 *bdaddr_type = ADDR_LE_DEV_PUBLIC;
3152         }
3153 }
3154
3155 /* Alloc HCI device */
3156 struct hci_dev *hci_alloc_dev(void)
3157 {
3158         struct hci_dev *hdev;
3159
3160         hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
3161         if (!hdev)
3162                 return NULL;
3163
3164         hdev->pkt_type  = (HCI_DM1 | HCI_DH1 | HCI_HV1);
3165         hdev->esco_type = (ESCO_HV1);
3166         hdev->link_mode = (HCI_LM_ACCEPT);
3167         hdev->num_iac = 0x01;           /* One IAC support is mandatory */
3168         hdev->io_capability = 0x03;     /* No Input No Output */
3169         hdev->manufacturer = 0xffff;    /* Default to internal use */
3170         hdev->inq_tx_power = HCI_TX_POWER_INVALID;
3171         hdev->adv_tx_power = HCI_TX_POWER_INVALID;
3172         hdev->adv_instance_cnt = 0;
3173         hdev->cur_adv_instance = 0x00;
3174         hdev->adv_instance_timeout = 0;
3175
3176         hdev->sniff_max_interval = 800;
3177         hdev->sniff_min_interval = 80;
3178
3179         hdev->le_adv_channel_map = 0x07;
3180         hdev->le_adv_min_interval = 0x0800;
3181         hdev->le_adv_max_interval = 0x0800;
3182         hdev->le_scan_interval = 0x0060;
3183         hdev->le_scan_window = 0x0030;
3184         hdev->le_conn_min_interval = 0x0018;
3185         hdev->le_conn_max_interval = 0x0028;
3186         hdev->le_conn_latency = 0x0000;
3187         hdev->le_supv_timeout = 0x002a;
3188         hdev->le_def_tx_len = 0x001b;
3189         hdev->le_def_tx_time = 0x0148;
3190         hdev->le_max_tx_len = 0x001b;
3191         hdev->le_max_tx_time = 0x0148;
3192         hdev->le_max_rx_len = 0x001b;
3193         hdev->le_max_rx_time = 0x0148;
3194         hdev->le_max_key_size = SMP_MAX_ENC_KEY_SIZE;
3195         hdev->le_min_key_size = SMP_MIN_ENC_KEY_SIZE;
3196         hdev->le_tx_def_phys = HCI_LE_SET_PHY_1M;
3197         hdev->le_rx_def_phys = HCI_LE_SET_PHY_1M;
3198         hdev->le_num_of_adv_sets = HCI_MAX_ADV_INSTANCES;
3199
3200         hdev->rpa_timeout = HCI_DEFAULT_RPA_TIMEOUT;
3201         hdev->discov_interleaved_timeout = DISCOV_INTERLEAVED_TIMEOUT;
3202         hdev->conn_info_min_age = DEFAULT_CONN_INFO_MIN_AGE;
3203         hdev->conn_info_max_age = DEFAULT_CONN_INFO_MAX_AGE;
3204         hdev->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
3205
3206         mutex_init(&hdev->lock);
3207         mutex_init(&hdev->req_lock);
3208
3209         INIT_LIST_HEAD(&hdev->mgmt_pending);
3210         INIT_LIST_HEAD(&hdev->blacklist);
3211         INIT_LIST_HEAD(&hdev->whitelist);
3212         INIT_LIST_HEAD(&hdev->uuids);
3213         INIT_LIST_HEAD(&hdev->link_keys);
3214         INIT_LIST_HEAD(&hdev->long_term_keys);
3215         INIT_LIST_HEAD(&hdev->identity_resolving_keys);
3216         INIT_LIST_HEAD(&hdev->remote_oob_data);
3217         INIT_LIST_HEAD(&hdev->le_white_list);
3218         INIT_LIST_HEAD(&hdev->le_resolv_list);
3219         INIT_LIST_HEAD(&hdev->le_conn_params);
3220         INIT_LIST_HEAD(&hdev->pend_le_conns);
3221         INIT_LIST_HEAD(&hdev->pend_le_reports);
3222         INIT_LIST_HEAD(&hdev->conn_hash.list);
3223         INIT_LIST_HEAD(&hdev->adv_instances);
3224
3225         INIT_WORK(&hdev->rx_work, hci_rx_work);
3226         INIT_WORK(&hdev->cmd_work, hci_cmd_work);
3227         INIT_WORK(&hdev->tx_work, hci_tx_work);
3228         INIT_WORK(&hdev->power_on, hci_power_on);
3229         INIT_WORK(&hdev->error_reset, hci_error_reset);
3230
3231         INIT_DELAYED_WORK(&hdev->power_off, hci_power_off);
3232
3233         skb_queue_head_init(&hdev->rx_q);
3234         skb_queue_head_init(&hdev->cmd_q);
3235         skb_queue_head_init(&hdev->raw_q);
3236
3237         init_waitqueue_head(&hdev->req_wait_q);
3238
3239         INIT_DELAYED_WORK(&hdev->cmd_timer, hci_cmd_timeout);
3240
3241         hci_request_setup(hdev);
3242
3243         hci_init_sysfs(hdev);
3244         discovery_init(hdev);
3245
3246         return hdev;
3247 }
3248 EXPORT_SYMBOL(hci_alloc_dev);
3249
3250 /* Free HCI device */
3251 void hci_free_dev(struct hci_dev *hdev)
3252 {
3253         /* will free via device release */
3254         put_device(&hdev->dev);
3255 }
3256 EXPORT_SYMBOL(hci_free_dev);
3257
3258 /* Register HCI device */
3259 int hci_register_dev(struct hci_dev *hdev)
3260 {
3261         int id, error;
3262
3263         if (!hdev->open || !hdev->close || !hdev->send)
3264                 return -EINVAL;
3265
3266         /* Do not allow HCI_AMP devices to register at index 0,
3267          * so the index can be used as the AMP controller ID.
3268          */
3269         switch (hdev->dev_type) {
3270         case HCI_PRIMARY:
3271                 id = ida_simple_get(&hci_index_ida, 0, 0, GFP_KERNEL);
3272                 break;
3273         case HCI_AMP:
3274                 id = ida_simple_get(&hci_index_ida, 1, 0, GFP_KERNEL);
3275                 break;
3276         default:
3277                 return -EINVAL;
3278         }
3279
3280         if (id < 0)
3281                 return id;
3282
3283         sprintf(hdev->name, "hci%d", id);
3284         hdev->id = id;
3285
3286         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
3287
3288         hdev->workqueue = alloc_ordered_workqueue("%s", WQ_HIGHPRI, hdev->name);
3289         if (!hdev->workqueue) {
3290                 error = -ENOMEM;
3291                 goto err;
3292         }
3293
3294         hdev->req_workqueue = alloc_ordered_workqueue("%s", WQ_HIGHPRI,
3295                                                       hdev->name);
3296         if (!hdev->req_workqueue) {
3297                 destroy_workqueue(hdev->workqueue);
3298                 error = -ENOMEM;
3299                 goto err;
3300         }
3301
3302         if (!IS_ERR_OR_NULL(bt_debugfs))
3303                 hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
3304
3305         dev_set_name(&hdev->dev, "%s", hdev->name);
3306
3307         error = device_add(&hdev->dev);
3308         if (error < 0)
3309                 goto err_wqueue;
3310
3311         hci_leds_init(hdev);
3312
3313         hdev->rfkill = rfkill_alloc(hdev->name, &hdev->dev,
3314                                     RFKILL_TYPE_BLUETOOTH, &hci_rfkill_ops,
3315                                     hdev);
3316         if (hdev->rfkill) {
3317                 if (rfkill_register(hdev->rfkill) < 0) {
3318                         rfkill_destroy(hdev->rfkill);
3319                         hdev->rfkill = NULL;
3320                 }
3321         }
3322
3323         if (hdev->rfkill && rfkill_blocked(hdev->rfkill))
3324                 hci_dev_set_flag(hdev, HCI_RFKILLED);
3325
3326         hci_dev_set_flag(hdev, HCI_SETUP);
3327         hci_dev_set_flag(hdev, HCI_AUTO_OFF);
3328
3329         if (hdev->dev_type == HCI_PRIMARY) {
3330                 /* Assume BR/EDR support until proven otherwise (such as
3331                  * through reading supported features during init.
3332                  */
3333                 hci_dev_set_flag(hdev, HCI_BREDR_ENABLED);
3334         }
3335
3336         write_lock(&hci_dev_list_lock);
3337         list_add(&hdev->list, &hci_dev_list);
3338         write_unlock(&hci_dev_list_lock);
3339
3340         /* Devices that are marked for raw-only usage are unconfigured
3341          * and should not be included in normal operation.
3342          */
3343         if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
3344                 hci_dev_set_flag(hdev, HCI_UNCONFIGURED);
3345
3346         hci_sock_dev_event(hdev, HCI_DEV_REG);
3347         hci_dev_hold(hdev);
3348
3349         queue_work(hdev->req_workqueue, &hdev->power_on);
3350
3351         return id;
3352
3353 err_wqueue:
3354         destroy_workqueue(hdev->workqueue);
3355         destroy_workqueue(hdev->req_workqueue);
3356 err:
3357         ida_simple_remove(&hci_index_ida, hdev->id);
3358
3359         return error;
3360 }
3361 EXPORT_SYMBOL(hci_register_dev);
3362
3363 /* Unregister HCI device */
3364 void hci_unregister_dev(struct hci_dev *hdev)
3365 {
3366         int id;
3367
3368         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
3369
3370         hci_dev_set_flag(hdev, HCI_UNREGISTER);
3371
3372         id = hdev->id;
3373
3374         write_lock(&hci_dev_list_lock);
3375         list_del(&hdev->list);
3376         write_unlock(&hci_dev_list_lock);
3377
3378         cancel_work_sync(&hdev->power_on);
3379
3380         hci_dev_do_close(hdev);
3381
3382         if (!test_bit(HCI_INIT, &hdev->flags) &&
3383             !hci_dev_test_flag(hdev, HCI_SETUP) &&
3384             !hci_dev_test_flag(hdev, HCI_CONFIG)) {
3385                 hci_dev_lock(hdev);
3386                 mgmt_index_removed(hdev);
3387                 hci_dev_unlock(hdev);
3388         }
3389
3390         /* mgmt_index_removed should take care of emptying the
3391          * pending list */
3392         BUG_ON(!list_empty(&hdev->mgmt_pending));
3393
3394         hci_sock_dev_event(hdev, HCI_DEV_UNREG);
3395
3396         if (hdev->rfkill) {
3397                 rfkill_unregister(hdev->rfkill);
3398                 rfkill_destroy(hdev->rfkill);
3399         }
3400
3401         device_del(&hdev->dev);
3402
3403         debugfs_remove_recursive(hdev->debugfs);
3404         kfree_const(hdev->hw_info);
3405         kfree_const(hdev->fw_info);
3406
3407         destroy_workqueue(hdev->workqueue);
3408         destroy_workqueue(hdev->req_workqueue);
3409
3410         hci_dev_lock(hdev);
3411         hci_bdaddr_list_clear(&hdev->blacklist);
3412         hci_bdaddr_list_clear(&hdev->whitelist);
3413         hci_uuids_clear(hdev);
3414         hci_link_keys_clear(hdev);
3415         hci_smp_ltks_clear(hdev);
3416         hci_smp_irks_clear(hdev);
3417         hci_remote_oob_data_clear(hdev);
3418         hci_adv_instances_clear(hdev);
3419         hci_bdaddr_list_clear(&hdev->le_white_list);
3420         hci_bdaddr_list_clear(&hdev->le_resolv_list);
3421         hci_conn_params_clear_all(hdev);
3422         hci_discovery_filter_clear(hdev);
3423         hci_dev_unlock(hdev);
3424
3425         hci_dev_put(hdev);
3426
3427         ida_simple_remove(&hci_index_ida, id);
3428 }
3429 EXPORT_SYMBOL(hci_unregister_dev);
3430
3431 /* Suspend HCI device */
3432 int hci_suspend_dev(struct hci_dev *hdev)
3433 {
3434         hci_sock_dev_event(hdev, HCI_DEV_SUSPEND);
3435         return 0;
3436 }
3437 EXPORT_SYMBOL(hci_suspend_dev);
3438
3439 /* Resume HCI device */
3440 int hci_resume_dev(struct hci_dev *hdev)
3441 {
3442         hci_sock_dev_event(hdev, HCI_DEV_RESUME);
3443         return 0;
3444 }
3445 EXPORT_SYMBOL(hci_resume_dev);
3446
3447 /* Reset HCI device */
3448 int hci_reset_dev(struct hci_dev *hdev)
3449 {
3450         static const u8 hw_err[] = { HCI_EV_HARDWARE_ERROR, 0x01, 0x00 };
3451         struct sk_buff *skb;
3452
3453         skb = bt_skb_alloc(3, GFP_ATOMIC);
3454         if (!skb)
3455                 return -ENOMEM;
3456
3457         hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
3458         skb_put_data(skb, hw_err, 3);
3459
3460         /* Send Hardware Error to upper stack */
3461         return hci_recv_frame(hdev, skb);
3462 }
3463 EXPORT_SYMBOL(hci_reset_dev);
3464
3465 /* Receive frame from HCI drivers */
3466 int hci_recv_frame(struct hci_dev *hdev, struct sk_buff *skb)
3467 {
3468         if (!hdev || (!test_bit(HCI_UP, &hdev->flags)
3469                       && !test_bit(HCI_INIT, &hdev->flags))) {
3470                 kfree_skb(skb);
3471                 return -ENXIO;
3472         }
3473
3474         if (hci_skb_pkt_type(skb) != HCI_EVENT_PKT &&
3475             hci_skb_pkt_type(skb) != HCI_ACLDATA_PKT &&
3476             hci_skb_pkt_type(skb) != HCI_SCODATA_PKT) {
3477                 kfree_skb(skb);
3478                 return -EINVAL;
3479         }
3480
3481         /* Incoming skb */
3482         bt_cb(skb)->incoming = 1;
3483
3484         /* Time stamp */
3485         __net_timestamp(skb);
3486
3487         skb_queue_tail(&hdev->rx_q, skb);
3488         queue_work(hdev->workqueue, &hdev->rx_work);
3489
3490         return 0;
3491 }
3492 EXPORT_SYMBOL(hci_recv_frame);
3493
3494 /* Receive diagnostic message from HCI drivers */
3495 int hci_recv_diag(struct hci_dev *hdev, struct sk_buff *skb)
3496 {
3497         /* Mark as diagnostic packet */
3498         hci_skb_pkt_type(skb) = HCI_DIAG_PKT;
3499
3500         /* Time stamp */
3501         __net_timestamp(skb);
3502
3503         skb_queue_tail(&hdev->rx_q, skb);
3504         queue_work(hdev->workqueue, &hdev->rx_work);
3505
3506         return 0;
3507 }
3508 EXPORT_SYMBOL(hci_recv_diag);
3509
3510 void hci_set_hw_info(struct hci_dev *hdev, const char *fmt, ...)
3511 {
3512         va_list vargs;
3513
3514         va_start(vargs, fmt);
3515         kfree_const(hdev->hw_info);
3516         hdev->hw_info = kvasprintf_const(GFP_KERNEL, fmt, vargs);
3517         va_end(vargs);
3518 }
3519 EXPORT_SYMBOL(hci_set_hw_info);
3520
3521 void hci_set_fw_info(struct hci_dev *hdev, const char *fmt, ...)
3522 {
3523         va_list vargs;
3524
3525         va_start(vargs, fmt);
3526         kfree_const(hdev->fw_info);
3527         hdev->fw_info = kvasprintf_const(GFP_KERNEL, fmt, vargs);
3528         va_end(vargs);
3529 }
3530 EXPORT_SYMBOL(hci_set_fw_info);
3531
3532 /* ---- Interface to upper protocols ---- */
3533
3534 int hci_register_cb(struct hci_cb *cb)
3535 {
3536         BT_DBG("%p name %s", cb, cb->name);
3537
3538         mutex_lock(&hci_cb_list_lock);
3539         list_add_tail(&cb->list, &hci_cb_list);
3540         mutex_unlock(&hci_cb_list_lock);
3541
3542         return 0;
3543 }
3544 EXPORT_SYMBOL(hci_register_cb);
3545
3546 int hci_unregister_cb(struct hci_cb *cb)
3547 {
3548         BT_DBG("%p name %s", cb, cb->name);
3549
3550         mutex_lock(&hci_cb_list_lock);
3551         list_del(&cb->list);
3552         mutex_unlock(&hci_cb_list_lock);
3553
3554         return 0;
3555 }
3556 EXPORT_SYMBOL(hci_unregister_cb);
3557
3558 static void hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
3559 {
3560         int err;
3561
3562         BT_DBG("%s type %d len %d", hdev->name, hci_skb_pkt_type(skb),
3563                skb->len);
3564
3565         /* Time stamp */
3566         __net_timestamp(skb);
3567
3568         /* Send copy to monitor */
3569         hci_send_to_monitor(hdev, skb);
3570
3571         if (atomic_read(&hdev->promisc)) {
3572                 /* Send copy to the sockets */
3573                 hci_send_to_sock(hdev, skb);
3574         }
3575
3576         /* Get rid of skb owner, prior to sending to the driver. */
3577         skb_orphan(skb);
3578
3579         if (!test_bit(HCI_RUNNING, &hdev->flags)) {
3580                 kfree_skb(skb);
3581                 return;
3582         }
3583
3584         err = hdev->send(hdev, skb);
3585         if (err < 0) {
3586                 bt_dev_err(hdev, "sending frame failed (%d)", err);
3587                 kfree_skb(skb);
3588         }
3589 }
3590
3591 /* Send HCI command */
3592 int hci_send_cmd(struct hci_dev *hdev, __u16 opcode, __u32 plen,
3593                  const void *param)
3594 {
3595         struct sk_buff *skb;
3596
3597         BT_DBG("%s opcode 0x%4.4x plen %d", hdev->name, opcode, plen);
3598
3599         skb = hci_prepare_cmd(hdev, opcode, plen, param);
3600         if (!skb) {
3601                 bt_dev_err(hdev, "no memory for command");
3602                 return -ENOMEM;
3603         }
3604
3605         /* Stand-alone HCI commands must be flagged as
3606          * single-command requests.
3607          */
3608         bt_cb(skb)->hci.req_flags |= HCI_REQ_START;
3609
3610         skb_queue_tail(&hdev->cmd_q, skb);
3611         queue_work(hdev->workqueue, &hdev->cmd_work);
3612
3613         return 0;
3614 }
3615
3616 int __hci_cmd_send(struct hci_dev *hdev, u16 opcode, u32 plen,
3617                    const void *param)
3618 {
3619         struct sk_buff *skb;
3620
3621         if (hci_opcode_ogf(opcode) != 0x3f) {
3622                 /* A controller receiving a command shall respond with either
3623                  * a Command Status Event or a Command Complete Event.
3624                  * Therefore, all standard HCI commands must be sent via the
3625                  * standard API, using hci_send_cmd or hci_cmd_sync helpers.
3626                  * Some vendors do not comply with this rule for vendor-specific
3627                  * commands and do not return any event. We want to support
3628                  * unresponded commands for such cases only.
3629                  */
3630                 bt_dev_err(hdev, "unresponded command not supported");
3631                 return -EINVAL;
3632         }
3633
3634         skb = hci_prepare_cmd(hdev, opcode, plen, param);
3635         if (!skb) {
3636                 bt_dev_err(hdev, "no memory for command (opcode 0x%4.4x)",
3637                            opcode);
3638                 return -ENOMEM;
3639         }
3640
3641         hci_send_frame(hdev, skb);
3642
3643         return 0;
3644 }
3645 EXPORT_SYMBOL(__hci_cmd_send);
3646
3647 /* Get data from the previously sent command */
3648 void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 opcode)
3649 {
3650         struct hci_command_hdr *hdr;
3651
3652         if (!hdev->sent_cmd)
3653                 return NULL;
3654
3655         hdr = (void *) hdev->sent_cmd->data;
3656
3657         if (hdr->opcode != cpu_to_le16(opcode))
3658                 return NULL;
3659
3660         BT_DBG("%s opcode 0x%4.4x", hdev->name, opcode);
3661
3662         return hdev->sent_cmd->data + HCI_COMMAND_HDR_SIZE;
3663 }
3664
3665 /* Send HCI command and wait for command commplete event */
3666 struct sk_buff *hci_cmd_sync(struct hci_dev *hdev, u16 opcode, u32 plen,
3667                              const void *param, u32 timeout)
3668 {
3669         struct sk_buff *skb;
3670
3671         if (!test_bit(HCI_UP, &hdev->flags))
3672                 return ERR_PTR(-ENETDOWN);
3673
3674         bt_dev_dbg(hdev, "opcode 0x%4.4x plen %d", opcode, plen);
3675
3676         hci_req_sync_lock(hdev);
3677         skb = __hci_cmd_sync(hdev, opcode, plen, param, timeout);
3678         hci_req_sync_unlock(hdev);
3679
3680         return skb;
3681 }
3682 EXPORT_SYMBOL(hci_cmd_sync);
3683
3684 /* Send ACL data */
3685 static void hci_add_acl_hdr(struct sk_buff *skb, __u16 handle, __u16 flags)
3686 {
3687         struct hci_acl_hdr *hdr;
3688         int len = skb->len;
3689
3690         skb_push(skb, HCI_ACL_HDR_SIZE);
3691         skb_reset_transport_header(skb);
3692         hdr = (struct hci_acl_hdr *)skb_transport_header(skb);
3693         hdr->handle = cpu_to_le16(hci_handle_pack(handle, flags));
3694         hdr->dlen   = cpu_to_le16(len);
3695 }
3696
3697 static void hci_queue_acl(struct hci_chan *chan, struct sk_buff_head *queue,
3698                           struct sk_buff *skb, __u16 flags)
3699 {
3700         struct hci_conn *conn = chan->conn;
3701         struct hci_dev *hdev = conn->hdev;
3702         struct sk_buff *list;
3703
3704         skb->len = skb_headlen(skb);
3705         skb->data_len = 0;
3706
3707         hci_skb_pkt_type(skb) = HCI_ACLDATA_PKT;
3708
3709         switch (hdev->dev_type) {
3710         case HCI_PRIMARY:
3711                 hci_add_acl_hdr(skb, conn->handle, flags);
3712                 break;
3713         case HCI_AMP:
3714                 hci_add_acl_hdr(skb, chan->handle, flags);
3715                 break;
3716         default:
3717                 bt_dev_err(hdev, "unknown dev_type %d", hdev->dev_type);
3718                 return;
3719         }
3720
3721         list = skb_shinfo(skb)->frag_list;
3722         if (!list) {
3723                 /* Non fragmented */
3724                 BT_DBG("%s nonfrag skb %p len %d", hdev->name, skb, skb->len);
3725
3726                 skb_queue_tail(queue, skb);
3727         } else {
3728                 /* Fragmented */
3729                 BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);
3730
3731                 skb_shinfo(skb)->frag_list = NULL;
3732
3733                 /* Queue all fragments atomically. We need to use spin_lock_bh
3734                  * here because of 6LoWPAN links, as there this function is
3735                  * called from softirq and using normal spin lock could cause
3736                  * deadlocks.
3737                  */
3738                 spin_lock_bh(&queue->lock);
3739
3740                 __skb_queue_tail(queue, skb);
3741
3742                 flags &= ~ACL_START;
3743                 flags |= ACL_CONT;
3744                 do {
3745                         skb = list; list = list->next;
3746
3747                         hci_skb_pkt_type(skb) = HCI_ACLDATA_PKT;
3748                         hci_add_acl_hdr(skb, conn->handle, flags);
3749
3750                         BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);
3751
3752                         __skb_queue_tail(queue, skb);
3753                 } while (list);
3754
3755                 spin_unlock_bh(&queue->lock);
3756         }
3757 }
3758
3759 void hci_send_acl(struct hci_chan *chan, struct sk_buff *skb, __u16 flags)
3760 {
3761         struct hci_dev *hdev = chan->conn->hdev;
3762
3763         BT_DBG("%s chan %p flags 0x%4.4x", hdev->name, chan, flags);
3764
3765         hci_queue_acl(chan, &chan->data_q, skb, flags);
3766
3767         queue_work(hdev->workqueue, &hdev->tx_work);
3768 }
3769
3770 /* Send SCO data */
3771 void hci_send_sco(struct hci_conn *conn, struct sk_buff *skb)
3772 {
3773         struct hci_dev *hdev = conn->hdev;
3774         struct hci_sco_hdr hdr;
3775
3776         BT_DBG("%s len %d", hdev->name, skb->len);
3777
3778         hdr.handle = cpu_to_le16(conn->handle);
3779         hdr.dlen   = skb->len;
3780
3781         skb_push(skb, HCI_SCO_HDR_SIZE);
3782         skb_reset_transport_header(skb);
3783         memcpy(skb_transport_header(skb), &hdr, HCI_SCO_HDR_SIZE);
3784
3785         hci_skb_pkt_type(skb) = HCI_SCODATA_PKT;
3786
3787         skb_queue_tail(&conn->data_q, skb);
3788         queue_work(hdev->workqueue, &hdev->tx_work);
3789 }
3790
3791 /* ---- HCI TX task (outgoing data) ---- */
3792
3793 /* HCI Connection scheduler */
3794 static struct hci_conn *hci_low_sent(struct hci_dev *hdev, __u8 type,
3795                                      int *quote)
3796 {
3797         struct hci_conn_hash *h = &hdev->conn_hash;
3798         struct hci_conn *conn = NULL, *c;
3799         unsigned int num = 0, min = ~0;
3800
3801         /* We don't have to lock device here. Connections are always
3802          * added and removed with TX task disabled. */
3803
3804         rcu_read_lock();
3805
3806         list_for_each_entry_rcu(c, &h->list, list) {
3807                 if (c->type != type || skb_queue_empty(&c->data_q))
3808                         continue;
3809
3810                 if (c->state != BT_CONNECTED && c->state != BT_CONFIG)
3811                         continue;
3812
3813                 num++;
3814
3815                 if (c->sent < min) {
3816                         min  = c->sent;
3817                         conn = c;
3818                 }
3819
3820                 if (hci_conn_num(hdev, type) == num)
3821                         break;
3822         }
3823
3824         rcu_read_unlock();
3825
3826         if (conn) {
3827                 int cnt, q;
3828
3829                 switch (conn->type) {
3830                 case ACL_LINK:
3831                         cnt = hdev->acl_cnt;
3832                         break;
3833                 case SCO_LINK:
3834                 case ESCO_LINK:
3835                         cnt = hdev->sco_cnt;
3836                         break;
3837                 case LE_LINK:
3838                         cnt = hdev->le_mtu ? hdev->le_cnt : hdev->acl_cnt;
3839                         break;
3840                 default:
3841                         cnt = 0;
3842                         bt_dev_err(hdev, "unknown link type %d", conn->type);
3843                 }
3844
3845                 q = cnt / num;
3846                 *quote = q ? q : 1;
3847         } else
3848                 *quote = 0;
3849
3850         BT_DBG("conn %p quote %d", conn, *quote);
3851         return conn;
3852 }
3853
3854 static void hci_link_tx_to(struct hci_dev *hdev, __u8 type)
3855 {
3856         struct hci_conn_hash *h = &hdev->conn_hash;
3857         struct hci_conn *c;
3858
3859         bt_dev_err(hdev, "link tx timeout");
3860
3861         rcu_read_lock();
3862
3863         /* Kill stalled connections */
3864         list_for_each_entry_rcu(c, &h->list, list) {
3865                 if (c->type == type && c->sent) {
3866                         bt_dev_err(hdev, "killing stalled connection %pMR",
3867                                    &c->dst);
3868                         hci_disconnect(c, HCI_ERROR_REMOTE_USER_TERM);
3869                 }
3870         }
3871
3872         rcu_read_unlock();
3873 }
3874
3875 static struct hci_chan *hci_chan_sent(struct hci_dev *hdev, __u8 type,
3876                                       int *quote)
3877 {
3878         struct hci_conn_hash *h = &hdev->conn_hash;
3879         struct hci_chan *chan = NULL;
3880         unsigned int num = 0, min = ~0, cur_prio = 0;
3881         struct hci_conn *conn;
3882         int cnt, q, conn_num = 0;
3883
3884         BT_DBG("%s", hdev->name);
3885
3886         rcu_read_lock();
3887
3888         list_for_each_entry_rcu(conn, &h->list, list) {
3889                 struct hci_chan *tmp;
3890
3891                 if (conn->type != type)
3892                         continue;
3893
3894                 if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG)
3895                         continue;
3896
3897                 conn_num++;
3898
3899                 list_for_each_entry_rcu(tmp, &conn->chan_list, list) {
3900                         struct sk_buff *skb;
3901
3902                         if (skb_queue_empty(&tmp->data_q))
3903                                 continue;
3904
3905                         skb = skb_peek(&tmp->data_q);
3906                         if (skb->priority < cur_prio)
3907                                 continue;
3908
3909                         if (skb->priority > cur_prio) {
3910                                 num = 0;
3911                                 min = ~0;
3912                                 cur_prio = skb->priority;
3913                         }
3914
3915                         num++;
3916
3917                         if (conn->sent < min) {
3918                                 min  = conn->sent;
3919                                 chan = tmp;
3920                         }
3921                 }
3922
3923                 if (hci_conn_num(hdev, type) == conn_num)
3924                         break;
3925         }
3926
3927         rcu_read_unlock();
3928
3929         if (!chan)
3930                 return NULL;
3931
3932         switch (chan->conn->type) {
3933         case ACL_LINK:
3934                 cnt = hdev->acl_cnt;
3935                 break;
3936         case AMP_LINK:
3937                 cnt = hdev->block_cnt;
3938                 break;
3939         case SCO_LINK:
3940         case ESCO_LINK:
3941                 cnt = hdev->sco_cnt;
3942                 break;
3943         case LE_LINK:
3944                 cnt = hdev->le_mtu ? hdev->le_cnt : hdev->acl_cnt;
3945                 break;
3946         default:
3947                 cnt = 0;
3948                 bt_dev_err(hdev, "unknown link type %d", chan->conn->type);
3949         }
3950
3951         q = cnt / num;
3952         *quote = q ? q : 1;
3953         BT_DBG("chan %p quote %d", chan, *quote);
3954         return chan;
3955 }
3956
3957 static void hci_prio_recalculate(struct hci_dev *hdev, __u8 type)
3958 {
3959         struct hci_conn_hash *h = &hdev->conn_hash;
3960         struct hci_conn *conn;
3961         int num = 0;
3962
3963         BT_DBG("%s", hdev->name);
3964
3965         rcu_read_lock();
3966
3967         list_for_each_entry_rcu(conn, &h->list, list) {
3968                 struct hci_chan *chan;
3969
3970                 if (conn->type != type)
3971                         continue;
3972
3973                 if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG)
3974                         continue;
3975
3976                 num++;
3977
3978                 list_for_each_entry_rcu(chan, &conn->chan_list, list) {
3979                         struct sk_buff *skb;
3980
3981                         if (chan->sent) {
3982                                 chan->sent = 0;
3983                                 continue;
3984                         }
3985
3986                         if (skb_queue_empty(&chan->data_q))
3987                                 continue;
3988
3989                         skb = skb_peek(&chan->data_q);
3990                         if (skb->priority >= HCI_PRIO_MAX - 1)
3991                                 continue;
3992
3993                         skb->priority = HCI_PRIO_MAX - 1;
3994
3995                         BT_DBG("chan %p skb %p promoted to %d", chan, skb,
3996                                skb->priority);
3997                 }
3998
3999                 if (hci_conn_num(hdev, type) == num)
4000                         break;
4001         }
4002
4003         rcu_read_unlock();
4004
4005 }
4006
4007 static inline int __get_blocks(struct hci_dev *hdev, struct sk_buff *skb)
4008 {
4009         /* Calculate count of blocks used by this packet */
4010         return DIV_ROUND_UP(skb->len - HCI_ACL_HDR_SIZE, hdev->block_len);
4011 }
4012
4013 static void __check_timeout(struct hci_dev *hdev, unsigned int cnt)
4014 {
4015         if (!hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
4016                 /* ACL tx timeout must be longer than maximum
4017                  * link supervision timeout (40.9 seconds) */
4018                 if (!cnt && time_after(jiffies, hdev->acl_last_tx +
4019                                        HCI_ACL_TX_TIMEOUT))
4020                         hci_link_tx_to(hdev, ACL_LINK);
4021         }
4022 }
4023
4024 static void hci_sched_acl_pkt(struct hci_dev *hdev)
4025 {
4026         unsigned int cnt = hdev->acl_cnt;
4027         struct hci_chan *chan;
4028         struct sk_buff *skb;
4029         int quote;
4030
4031         __check_timeout(hdev, cnt);
4032
4033         while (hdev->acl_cnt &&
4034                (chan = hci_chan_sent(hdev, ACL_LINK, &quote))) {
4035                 u32 priority = (skb_peek(&chan->data_q))->priority;
4036                 while (quote-- && (skb = skb_peek(&chan->data_q))) {
4037                         BT_DBG("chan %p skb %p len %d priority %u", chan, skb,
4038                                skb->len, skb->priority);
4039
4040                         /* Stop if priority has changed */
4041                         if (skb->priority < priority)
4042                                 break;
4043
4044                         skb = skb_dequeue(&chan->data_q);
4045
4046                         hci_conn_enter_active_mode(chan->conn,
4047                                                    bt_cb(skb)->force_active);
4048
4049                         hci_send_frame(hdev, skb);
4050                         hdev->acl_last_tx = jiffies;
4051
4052                         hdev->acl_cnt--;
4053                         chan->sent++;
4054                         chan->conn->sent++;
4055                 }
4056         }
4057
4058         if (cnt != hdev->acl_cnt)
4059                 hci_prio_recalculate(hdev, ACL_LINK);
4060 }
4061
4062 static void hci_sched_acl_blk(struct hci_dev *hdev)
4063 {
4064         unsigned int cnt = hdev->block_cnt;
4065         struct hci_chan *chan;
4066         struct sk_buff *skb;
4067         int quote;
4068         u8 type;
4069
4070         __check_timeout(hdev, cnt);
4071
4072         BT_DBG("%s", hdev->name);
4073
4074         if (hdev->dev_type == HCI_AMP)
4075                 type = AMP_LINK;
4076         else
4077                 type = ACL_LINK;
4078
4079         while (hdev->block_cnt > 0 &&
4080                (chan = hci_chan_sent(hdev, type, &quote))) {
4081                 u32 priority = (skb_peek(&chan->data_q))->priority;
4082                 while (quote > 0 && (skb = skb_peek(&chan->data_q))) {
4083                         int blocks;
4084
4085                         BT_DBG("chan %p skb %p len %d priority %u", chan, skb,
4086                                skb->len, skb->priority);
4087
4088                         /* Stop if priority has changed */
4089                         if (skb->priority < priority)
4090                                 break;
4091
4092                         skb = skb_dequeue(&chan->data_q);
4093
4094                         blocks = __get_blocks(hdev, skb);
4095                         if (blocks > hdev->block_cnt)
4096                                 return;
4097
4098                         hci_conn_enter_active_mode(chan->conn,
4099                                                    bt_cb(skb)->force_active);
4100
4101                         hci_send_frame(hdev, skb);
4102                         hdev->acl_last_tx = jiffies;
4103
4104                         hdev->block_cnt -= blocks;
4105                         quote -= blocks;
4106
4107                         chan->sent += blocks;
4108                         chan->conn->sent += blocks;
4109                 }
4110         }
4111
4112         if (cnt != hdev->block_cnt)
4113                 hci_prio_recalculate(hdev, type);
4114 }
4115
4116 static void hci_sched_acl(struct hci_dev *hdev)
4117 {
4118         BT_DBG("%s", hdev->name);
4119
4120         /* No ACL link over BR/EDR controller */
4121         if (!hci_conn_num(hdev, ACL_LINK) && hdev->dev_type == HCI_PRIMARY)
4122                 return;
4123
4124         /* No AMP link over AMP controller */
4125         if (!hci_conn_num(hdev, AMP_LINK) && hdev->dev_type == HCI_AMP)
4126                 return;
4127
4128         switch (hdev->flow_ctl_mode) {
4129         case HCI_FLOW_CTL_MODE_PACKET_BASED:
4130                 hci_sched_acl_pkt(hdev);
4131                 break;
4132
4133         case HCI_FLOW_CTL_MODE_BLOCK_BASED:
4134                 hci_sched_acl_blk(hdev);
4135                 break;
4136         }
4137 }
4138
4139 /* Schedule SCO */
4140 static void hci_sched_sco(struct hci_dev *hdev)
4141 {
4142         struct hci_conn *conn;
4143         struct sk_buff *skb;
4144         int quote;
4145
4146         BT_DBG("%s", hdev->name);
4147
4148         if (!hci_conn_num(hdev, SCO_LINK))
4149                 return;
4150
4151         while (hdev->sco_cnt && (conn = hci_low_sent(hdev, SCO_LINK, &quote))) {
4152                 while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
4153                         BT_DBG("skb %p len %d", skb, skb->len);
4154                         hci_send_frame(hdev, skb);
4155
4156                         conn->sent++;
4157                         if (conn->sent == ~0)
4158                                 conn->sent = 0;
4159                 }
4160         }
4161 }
4162
4163 static void hci_sched_esco(struct hci_dev *hdev)
4164 {
4165         struct hci_conn *conn;
4166         struct sk_buff *skb;
4167         int quote;
4168
4169         BT_DBG("%s", hdev->name);
4170
4171         if (!hci_conn_num(hdev, ESCO_LINK))
4172                 return;
4173
4174         while (hdev->sco_cnt && (conn = hci_low_sent(hdev, ESCO_LINK,
4175                                                      &quote))) {
4176                 while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
4177                         BT_DBG("skb %p len %d", skb, skb->len);
4178                         hci_send_frame(hdev, skb);
4179
4180                         conn->sent++;
4181                         if (conn->sent == ~0)
4182                                 conn->sent = 0;
4183                 }
4184         }
4185 }
4186
4187 static void hci_sched_le(struct hci_dev *hdev)
4188 {
4189         struct hci_chan *chan;
4190         struct sk_buff *skb;
4191         int quote, cnt, tmp;
4192
4193         BT_DBG("%s", hdev->name);
4194
4195         if (!hci_conn_num(hdev, LE_LINK))
4196                 return;
4197
4198         if (!hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
4199                 /* LE tx timeout must be longer than maximum
4200                  * link supervision timeout (40.9 seconds) */
4201                 if (!hdev->le_cnt && hdev->le_pkts &&
4202                     time_after(jiffies, hdev->le_last_tx + HZ * 45))
4203                         hci_link_tx_to(hdev, LE_LINK);
4204         }
4205
4206         cnt = hdev->le_pkts ? hdev->le_cnt : hdev->acl_cnt;
4207         tmp = cnt;
4208         while (cnt && (chan = hci_chan_sent(hdev, LE_LINK, &quote))) {
4209                 u32 priority = (skb_peek(&chan->data_q))->priority;
4210                 while (quote-- && (skb = skb_peek(&chan->data_q))) {
4211                         BT_DBG("chan %p skb %p len %d priority %u", chan, skb,
4212                                skb->len, skb->priority);
4213
4214                         /* Stop if priority has changed */
4215                         if (skb->priority < priority)
4216                                 break;
4217
4218                         skb = skb_dequeue(&chan->data_q);
4219
4220                         hci_send_frame(hdev, skb);
4221                         hdev->le_last_tx = jiffies;
4222
4223                         cnt--;
4224                         chan->sent++;
4225                         chan->conn->sent++;
4226                 }
4227         }
4228
4229         if (hdev->le_pkts)
4230                 hdev->le_cnt = cnt;
4231         else
4232                 hdev->acl_cnt = cnt;
4233
4234         if (cnt != tmp)
4235                 hci_prio_recalculate(hdev, LE_LINK);
4236 }
4237
4238 static void hci_tx_work(struct work_struct *work)
4239 {
4240         struct hci_dev *hdev = container_of(work, struct hci_dev, tx_work);
4241         struct sk_buff *skb;
4242
4243         BT_DBG("%s acl %d sco %d le %d", hdev->name, hdev->acl_cnt,
4244                hdev->sco_cnt, hdev->le_cnt);
4245
4246         if (!hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
4247                 /* Schedule queues and send stuff to HCI driver */
4248                 hci_sched_acl(hdev);
4249                 hci_sched_sco(hdev);
4250                 hci_sched_esco(hdev);
4251                 hci_sched_le(hdev);
4252         }
4253
4254         /* Send next queued raw (unknown type) packet */
4255         while ((skb = skb_dequeue(&hdev->raw_q)))
4256                 hci_send_frame(hdev, skb);
4257 }
4258
4259 /* ----- HCI RX task (incoming data processing) ----- */
4260
4261 /* ACL data packet */
4262 static void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb)
4263 {
4264         struct hci_acl_hdr *hdr = (void *) skb->data;
4265         struct hci_conn *conn;
4266         __u16 handle, flags;
4267
4268         skb_pull(skb, HCI_ACL_HDR_SIZE);
4269
4270         handle = __le16_to_cpu(hdr->handle);
4271         flags  = hci_flags(handle);
4272         handle = hci_handle(handle);
4273
4274         BT_DBG("%s len %d handle 0x%4.4x flags 0x%4.4x", hdev->name, skb->len,
4275                handle, flags);
4276
4277         hdev->stat.acl_rx++;
4278
4279         hci_dev_lock(hdev);
4280         conn = hci_conn_hash_lookup_handle(hdev, handle);
4281         hci_dev_unlock(hdev);
4282
4283         if (conn) {
4284                 hci_conn_enter_active_mode(conn, BT_POWER_FORCE_ACTIVE_OFF);
4285
4286                 /* Send to upper protocol */
4287                 l2cap_recv_acldata(conn, skb, flags);
4288                 return;
4289         } else {
4290                 bt_dev_err(hdev, "ACL packet for unknown connection handle %d",
4291                            handle);
4292         }
4293
4294         kfree_skb(skb);
4295 }
4296
4297 /* SCO data packet */
4298 static void hci_scodata_packet(struct hci_dev *hdev, struct sk_buff *skb)
4299 {
4300         struct hci_sco_hdr *hdr = (void *) skb->data;
4301         struct hci_conn *conn;
4302         __u16 handle;
4303
4304         skb_pull(skb, HCI_SCO_HDR_SIZE);
4305
4306         handle = __le16_to_cpu(hdr->handle);
4307
4308         BT_DBG("%s len %d handle 0x%4.4x", hdev->name, skb->len, handle);
4309
4310         hdev->stat.sco_rx++;
4311
4312         hci_dev_lock(hdev);
4313         conn = hci_conn_hash_lookup_handle(hdev, handle);
4314         hci_dev_unlock(hdev);
4315
4316         if (conn) {
4317                 /* Send to upper protocol */
4318                 sco_recv_scodata(conn, skb);
4319                 return;
4320         } else {
4321                 bt_dev_err(hdev, "SCO packet for unknown connection handle %d",
4322                            handle);
4323         }
4324
4325         kfree_skb(skb);
4326 }
4327
4328 static bool hci_req_is_complete(struct hci_dev *hdev)
4329 {
4330         struct sk_buff *skb;
4331
4332         skb = skb_peek(&hdev->cmd_q);
4333         if (!skb)
4334                 return true;
4335
4336         return (bt_cb(skb)->hci.req_flags & HCI_REQ_START);
4337 }
4338
4339 static void hci_resend_last(struct hci_dev *hdev)
4340 {
4341         struct hci_command_hdr *sent;
4342         struct sk_buff *skb;
4343         u16 opcode;
4344
4345         if (!hdev->sent_cmd)
4346                 return;
4347
4348         sent = (void *) hdev->sent_cmd->data;
4349         opcode = __le16_to_cpu(sent->opcode);
4350         if (opcode == HCI_OP_RESET)
4351                 return;
4352
4353         skb = skb_clone(hdev->sent_cmd, GFP_KERNEL);
4354         if (!skb)
4355                 return;
4356
4357         skb_queue_head(&hdev->cmd_q, skb);
4358         queue_work(hdev->workqueue, &hdev->cmd_work);
4359 }
4360
4361 void hci_req_cmd_complete(struct hci_dev *hdev, u16 opcode, u8 status,
4362                           hci_req_complete_t *req_complete,
4363                           hci_req_complete_skb_t *req_complete_skb)
4364 {
4365         struct sk_buff *skb;
4366         unsigned long flags;
4367
4368         BT_DBG("opcode 0x%04x status 0x%02x", opcode, status);
4369
4370         /* If the completed command doesn't match the last one that was
4371          * sent we need to do special handling of it.
4372          */
4373         if (!hci_sent_cmd_data(hdev, opcode)) {
4374                 /* Some CSR based controllers generate a spontaneous
4375                  * reset complete event during init and any pending
4376                  * command will never be completed. In such a case we
4377                  * need to resend whatever was the last sent
4378                  * command.
4379                  */
4380                 if (test_bit(HCI_INIT, &hdev->flags) && opcode == HCI_OP_RESET)
4381                         hci_resend_last(hdev);
4382
4383                 return;
4384         }
4385
4386         /* If we reach this point this event matches the last command sent */
4387         hci_dev_clear_flag(hdev, HCI_CMD_PENDING);
4388
4389         /* If the command succeeded and there's still more commands in
4390          * this request the request is not yet complete.
4391          */
4392         if (!status && !hci_req_is_complete(hdev))
4393                 return;
4394
4395         /* If this was the last command in a request the complete
4396          * callback would be found in hdev->sent_cmd instead of the
4397          * command queue (hdev->cmd_q).
4398          */
4399         if (bt_cb(hdev->sent_cmd)->hci.req_flags & HCI_REQ_SKB) {
4400                 *req_complete_skb = bt_cb(hdev->sent_cmd)->hci.req_complete_skb;
4401                 return;
4402         }
4403
4404         if (bt_cb(hdev->sent_cmd)->hci.req_complete) {
4405                 *req_complete = bt_cb(hdev->sent_cmd)->hci.req_complete;
4406                 return;
4407         }
4408
4409         /* Remove all pending commands belonging to this request */
4410         spin_lock_irqsave(&hdev->cmd_q.lock, flags);
4411         while ((skb = __skb_dequeue(&hdev->cmd_q))) {
4412                 if (bt_cb(skb)->hci.req_flags & HCI_REQ_START) {
4413                         __skb_queue_head(&hdev->cmd_q, skb);
4414                         break;
4415                 }
4416
4417                 if (bt_cb(skb)->hci.req_flags & HCI_REQ_SKB)
4418                         *req_complete_skb = bt_cb(skb)->hci.req_complete_skb;
4419                 else
4420                         *req_complete = bt_cb(skb)->hci.req_complete;
4421                 kfree_skb(skb);
4422         }
4423         spin_unlock_irqrestore(&hdev->cmd_q.lock, flags);
4424 }
4425
4426 static void hci_rx_work(struct work_struct *work)
4427 {
4428         struct hci_dev *hdev = container_of(work, struct hci_dev, rx_work);
4429         struct sk_buff *skb;
4430
4431         BT_DBG("%s", hdev->name);
4432
4433         while ((skb = skb_dequeue(&hdev->rx_q))) {
4434                 /* Send copy to monitor */
4435                 hci_send_to_monitor(hdev, skb);
4436
4437                 if (atomic_read(&hdev->promisc)) {
4438                         /* Send copy to the sockets */
4439                         hci_send_to_sock(hdev, skb);
4440                 }
4441
4442                 if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
4443                         kfree_skb(skb);
4444                         continue;
4445                 }
4446
4447                 if (test_bit(HCI_INIT, &hdev->flags)) {
4448                         /* Don't process data packets in this states. */
4449                         switch (hci_skb_pkt_type(skb)) {
4450                         case HCI_ACLDATA_PKT:
4451                         case HCI_SCODATA_PKT:
4452                                 kfree_skb(skb);
4453                                 continue;
4454                         }
4455                 }
4456
4457                 /* Process frame */
4458                 switch (hci_skb_pkt_type(skb)) {
4459                 case HCI_EVENT_PKT:
4460                         BT_DBG("%s Event packet", hdev->name);
4461                         hci_event_packet(hdev, skb);
4462                         break;
4463
4464                 case HCI_ACLDATA_PKT:
4465                         BT_DBG("%s ACL data packet", hdev->name);
4466                         hci_acldata_packet(hdev, skb);
4467                         break;
4468
4469                 case HCI_SCODATA_PKT:
4470                         BT_DBG("%s SCO data packet", hdev->name);
4471                         hci_scodata_packet(hdev, skb);
4472                         break;
4473
4474                 default:
4475                         kfree_skb(skb);
4476                         break;
4477                 }
4478         }
4479 }
4480
4481 static void hci_cmd_work(struct work_struct *work)
4482 {
4483         struct hci_dev *hdev = container_of(work, struct hci_dev, cmd_work);
4484         struct sk_buff *skb;
4485
4486         BT_DBG("%s cmd_cnt %d cmd queued %d", hdev->name,
4487                atomic_read(&hdev->cmd_cnt), skb_queue_len(&hdev->cmd_q));
4488
4489         /* Send queued commands */
4490         if (atomic_read(&hdev->cmd_cnt)) {
4491                 skb = skb_dequeue(&hdev->cmd_q);
4492                 if (!skb)
4493                         return;
4494
4495                 kfree_skb(hdev->sent_cmd);
4496
4497                 hdev->sent_cmd = skb_clone(skb, GFP_KERNEL);
4498                 if (hdev->sent_cmd) {
4499                         if (hci_req_status_pend(hdev))
4500                                 hci_dev_set_flag(hdev, HCI_CMD_PENDING);
4501                         atomic_dec(&hdev->cmd_cnt);
4502                         hci_send_frame(hdev, skb);
4503                         if (test_bit(HCI_RESET, &hdev->flags))
4504                                 cancel_delayed_work(&hdev->cmd_timer);
4505                         else
4506                                 schedule_delayed_work(&hdev->cmd_timer,
4507                                                       HCI_CMD_TIMEOUT);
4508                 } else {
4509                         skb_queue_head(&hdev->cmd_q, skb);
4510                         queue_work(hdev->workqueue, &hdev->cmd_work);
4511                 }
4512         }
4513 }