kernel/net/bluetooth/hci_request.c

   1 /*
   2    BlueZ - Bluetooth protocol stack for Linux
   3
   4    Copyright (C) 2014 Intel Corporation
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License version 2 as
   8    published by the Free Software Foundation;
   9
  10    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  11    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  12    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  13    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  14    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  15    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18
  19    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  20    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  21    SOFTWARE IS DISCLAIMED.
  22 */
  23
  24 #include <net/bluetooth/bluetooth.h>
  25 #include <net/bluetooth/hci_core.h>
  26
  27 #include "smp.h"
  28 #include "hci_request.h"
  29
  30 void hci_req_init(struct hci_request *req, struct hci_dev *hdev)
  31 {
  32         skb_queue_head_init(&req->cmd_q);
  33         req->hdev = hdev;
  34         req->err = 0;
  35 }
  36
  37 static int req_run(struct hci_request *req, hci_req_complete_t complete,
  38                    hci_req_complete_skb_t complete_skb)
  39 {
  40         struct hci_dev *hdev = req->hdev;
  41         struct sk_buff *skb;
  42         unsigned long flags;
  43
  44         BT_DBG("length %u", skb_queue_len(&req->cmd_q));
  45
  46         /* If an error occurred during request building, remove all HCI
  47          * commands queued on the HCI request queue.
  48          */
  49         if (req->err) {
  50                 skb_queue_purge(&req->cmd_q);
  51                 return req->err;
  52         }
  53
  54         /* Do not allow empty requests */
  55         if (skb_queue_empty(&req->cmd_q))
  56                 return -ENODATA;
  57
  58         skb = skb_peek_tail(&req->cmd_q);
  59         bt_cb(skb)->hci.req_complete = complete;
  60         bt_cb(skb)->hci.req_complete_skb = complete_skb;
  61
  62         spin_lock_irqsave(&hdev->cmd_q.lock, flags);
  63         skb_queue_splice_tail(&req->cmd_q, &hdev->cmd_q);
  64         spin_unlock_irqrestore(&hdev->cmd_q.lock, flags);
  65
  66         queue_work(hdev->workqueue, &hdev->cmd_work);
  67
  68         return 0;
  69 }
  70
  71 int hci_req_run(struct hci_request *req, hci_req_complete_t complete)
  72 {
  73         return req_run(req, complete, NULL);
  74 }
  75
  76 int hci_req_run_skb(struct hci_request *req, hci_req_complete_skb_t complete)
  77 {
  78         return req_run(req, NULL, complete);
  79 }
  80
  81 struct sk_buff *hci_prepare_cmd(struct hci_dev *hdev, u16 opcode, u32 plen,
  82                                 const void *param)
  83 {
  84         int len = HCI_COMMAND_HDR_SIZE + plen;
  85         struct hci_command_hdr *hdr;
  86         struct sk_buff *skb;
  87
  88         skb = bt_skb_alloc(len, GFP_ATOMIC);
  89         if (!skb)
  90                 return NULL;
  91
  92         hdr = (struct hci_command_hdr *) skb_put(skb, HCI_COMMAND_HDR_SIZE);
  93         hdr->opcode = cpu_to_le16(opcode);
  94         hdr->plen   = plen;
  95
  96         if (plen)
  97                 memcpy(skb_put(skb, plen), param, plen);
  98
  99         BT_DBG("skb len %d", skb->len);
 100
 101         bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
 102         bt_cb(skb)->hci.opcode = opcode;
 103
 104         return skb;
 105 }
 106
 107 /* Queue a command to an asynchronous HCI request */
 108 void hci_req_add_ev(struct hci_request *req, u16 opcode, u32 plen,
 109                     const void *param, u8 event)
 110 {
 111         struct hci_dev *hdev = req->hdev;
 112         struct sk_buff *skb;
 113
 114         BT_DBG("%s opcode 0x%4.4x plen %d", hdev->name, opcode, plen);
 115
 116         /* If an error occurred during request building, there is no point in
 117          * queueing the HCI command. We can simply return.
 118          */
 119         if (req->err)
 120                 return;
 121
 122         skb = hci_prepare_cmd(hdev, opcode, plen, param);
 123         if (!skb) {
 124                 BT_ERR("%s no memory for command (opcode 0x%4.4x)",
 125                        hdev->name, opcode);
 126                 req->err = -ENOMEM;
 127                 return;
 128         }
 129
 130         if (skb_queue_empty(&req->cmd_q))
 131                 bt_cb(skb)->hci.req_start = true;
 132
 133         bt_cb(skb)->hci.req_event = event;
 134
 135         skb_queue_tail(&req->cmd_q, skb);
 136 }
 137
 138 void hci_req_add(struct hci_request *req, u16 opcode, u32 plen,
 139                  const void *param)
 140 {
 141         hci_req_add_ev(req, opcode, plen, param, 0);
 142 }
 143
 144 void hci_req_add_le_scan_disable(struct hci_request *req)
 145 {
 146         struct hci_cp_le_set_scan_enable cp;
 147
 148         memset(&cp, 0, sizeof(cp));
 149         cp.enable = LE_SCAN_DISABLE;
 150         hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);
 151 }
 152
 153 static void add_to_white_list(struct hci_request *req,
 154                               struct hci_conn_params *params)
 155 {
 156         struct hci_cp_le_add_to_white_list cp;
 157
 158         cp.bdaddr_type = params->addr_type;
 159         bacpy(&cp.bdaddr, &params->addr);
 160
 161         hci_req_add(req, HCI_OP_LE_ADD_TO_WHITE_LIST, sizeof(cp), &cp);
 162 }
 163
 164 static u8 update_white_list(struct hci_request *req)
 165 {
 166         struct hci_dev *hdev = req->hdev;
 167         struct hci_conn_params *params;
 168         struct bdaddr_list *b;
 169         uint8_t white_list_entries = 0;
 170
 171         /* Go through the current white list programmed into the
 172          * controller one by one and check if that address is still
 173          * in the list of pending connections or list of devices to
 174          * report. If not present in either list, then queue the
 175          * command to remove it from the controller.
 176          */
 177         list_for_each_entry(b, &hdev->le_white_list, list) {
 178                 /* If the device is neither in pend_le_conns nor
 179                  * pend_le_reports then remove it from the whitelist.
 180                  */
 181                 if (!hci_pend_le_action_lookup(&hdev->pend_le_conns,
 182                                                &b->bdaddr, b->bdaddr_type) &&
 183                     !hci_pend_le_action_lookup(&hdev->pend_le_reports,
 184                                                &b->bdaddr, b->bdaddr_type)) {
 185                         struct hci_cp_le_del_from_white_list cp;
 186
 187                         cp.bdaddr_type = b->bdaddr_type;
 188                         bacpy(&cp.bdaddr, &b->bdaddr);
 189
 190                         hci_req_add(req, HCI_OP_LE_DEL_FROM_WHITE_LIST,
 191                                     sizeof(cp), &cp);
 192                         continue;
 193                 }
 194
 195                 if (hci_find_irk_by_addr(hdev, &b->bdaddr, b->bdaddr_type)) {
 196                         /* White list can not be used with RPAs */
 197                         return 0x00;
 198                 }
 199
 200                 white_list_entries++;
 201         }
 202
 203         /* Since all no longer valid white list entries have been
 204          * removed, walk through the list of pending connections
 205          * and ensure that any new device gets programmed into
 206          * the controller.
 207          *
 208          * If the list of the devices is larger than the list of
 209          * available white list entries in the controller, then
 210          * just abort and return filer policy value to not use the
 211          * white list.
 212          */
 213         list_for_each_entry(params, &hdev->pend_le_conns, action) {
 214                 if (hci_bdaddr_list_lookup(&hdev->le_white_list,
 215                                            &params->addr, params->addr_type))
 216                         continue;
 217
 218                 if (white_list_entries >= hdev->le_white_list_size) {
 219                         /* Select filter policy to accept all advertising */
 220                         return 0x00;
 221                 }
 222
 223                 if (hci_find_irk_by_addr(hdev, &params->addr,
 224                                          params->addr_type)) {
 225                         /* White list can not be used with RPAs */
 226                         return 0x00;
 227                 }
 228
 229                 white_list_entries++;
 230                 add_to_white_list(req, params);
 231         }
 232
 233         /* After adding all new pending connections, walk through
 234          * the list of pending reports and also add these to the
 235          * white list if there is still space.
 236          */
 237         list_for_each_entry(params, &hdev->pend_le_reports, action) {
 238                 if (hci_bdaddr_list_lookup(&hdev->le_white_list,
 239                                            &params->addr, params->addr_type))
 240                         continue;
 241
 242                 if (white_list_entries >= hdev->le_white_list_size) {
 243                         /* Select filter policy to accept all advertising */
 244                         return 0x00;
 245                 }
 246
 247                 if (hci_find_irk_by_addr(hdev, &params->addr,
 248                                          params->addr_type)) {
 249                         /* White list can not be used with RPAs */
 250                         return 0x00;
 251                 }
 252
 253                 white_list_entries++;
 254                 add_to_white_list(req, params);
 255         }
 256
 257         /* Select filter policy to use white list */
 258         return 0x01;
 259 }
 260
 261 void hci_req_add_le_passive_scan(struct hci_request *req)
 262 {
 263         struct hci_cp_le_set_scan_param param_cp;
 264         struct hci_cp_le_set_scan_enable enable_cp;
 265         struct hci_dev *hdev = req->hdev;
 266         u8 own_addr_type;
 267         u8 filter_policy;
 268
 269         /* Set require_privacy to false since no SCAN_REQ are send
 270          * during passive scanning. Not using an non-resolvable address
 271          * here is important so that peer devices using direct
 272          * advertising with our address will be correctly reported
 273          * by the controller.
 274          */
 275         if (hci_update_random_address(req, false, &own_addr_type))
 276                 return;
 277
 278         /* Adding or removing entries from the white list must
 279          * happen before enabling scanning. The controller does
 280          * not allow white list modification while scanning.
 281          */
 282         filter_policy = update_white_list(req);
 283
 284         /* When the controller is using random resolvable addresses and
 285          * with that having LE privacy enabled, then controllers with
 286          * Extended Scanner Filter Policies support can now enable support
 287          * for handling directed advertising.
 288          *
 289          * So instead of using filter polices 0x00 (no whitelist)
 290          * and 0x01 (whitelist enabled) use the new filter policies
 291          * 0x02 (no whitelist) and 0x03 (whitelist enabled).
 292          */
 293         if (hci_dev_test_flag(hdev, HCI_PRIVACY) &&
 294             (hdev->le_features[0] & HCI_LE_EXT_SCAN_POLICY))
 295                 filter_policy |= 0x02;
 296
 297         memset(&param_cp, 0, sizeof(param_cp));
 298         param_cp.type = LE_SCAN_PASSIVE;
 299         param_cp.interval = cpu_to_le16(hdev->le_scan_interval);
 300         param_cp.window = cpu_to_le16(hdev->le_scan_window);
 301         param_cp.own_address_type = own_addr_type;
 302         param_cp.filter_policy = filter_policy;
 303         hci_req_add(req, HCI_OP_LE_SET_SCAN_PARAM, sizeof(param_cp),
 304                     &param_cp);
 305
 306         memset(&enable_cp, 0, sizeof(enable_cp));
 307         enable_cp.enable = LE_SCAN_ENABLE;
 308         enable_cp.filter_dup = LE_SCAN_FILTER_DUP_ENABLE;
 309         hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(enable_cp),
 310                     &enable_cp);
 311 }
 312
 313 static void set_random_addr(struct hci_request *req, bdaddr_t *rpa)
 314 {
 315         struct hci_dev *hdev = req->hdev;
 316
 317         /* If we're advertising or initiating an LE connection we can't
 318          * go ahead and change the random address at this time. This is
 319          * because the eventual initiator address used for the
 320          * subsequently created connection will be undefined (some
 321          * controllers use the new address and others the one we had
 322          * when the operation started).
 323          *
 324          * In this kind of scenario skip the update and let the random
 325          * address be updated at the next cycle.
 326          */
 327         if (hci_dev_test_flag(hdev, HCI_LE_ADV) ||
 328             hci_lookup_le_connect(hdev)) {
 329                 BT_DBG("Deferring random address update");
 330                 hci_dev_set_flag(hdev, HCI_RPA_EXPIRED);
 331                 return;
 332         }
 333
 334         hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6, rpa);
 335 }
 336
 337 int hci_update_random_address(struct hci_request *req, bool require_privacy,
 338                               u8 *own_addr_type)
 339 {
 340         struct hci_dev *hdev = req->hdev;
 341         int err;
 342
 343         /* If privacy is enabled use a resolvable private address. If
 344          * current RPA has expired or there is something else than
 345          * the current RPA in use, then generate a new one.
 346          */
 347         if (hci_dev_test_flag(hdev, HCI_PRIVACY)) {
 348                 int to;
 349
 350                 *own_addr_type = ADDR_LE_DEV_RANDOM;
 351
 352                 if (!hci_dev_test_and_clear_flag(hdev, HCI_RPA_EXPIRED) &&
 353                     !bacmp(&hdev->random_addr, &hdev->rpa))
 354                         return 0;
 355
 356                 err = smp_generate_rpa(hdev, hdev->irk, &hdev->rpa);
 357                 if (err < 0) {
 358                         BT_ERR("%s failed to generate new RPA", hdev->name);
 359                         return err;
 360                 }
 361
 362                 set_random_addr(req, &hdev->rpa);
 363
 364                 to = msecs_to_jiffies(hdev->rpa_timeout * 1000);
 365                 queue_delayed_work(hdev->workqueue, &hdev->rpa_expired, to);
 366
 367                 return 0;
 368         }
 369
 370         /* In case of required privacy without resolvable private address,
 371          * use an non-resolvable private address. This is useful for active
 372          * scanning and non-connectable advertising.
 373          */
 374         if (require_privacy) {
 375                 bdaddr_t nrpa;
 376
 377                 while (true) {
 378                         /* The non-resolvable private address is generated
 379                          * from random six bytes with the two most significant
 380                          * bits cleared.
 381                          */
 382                         get_random_bytes(&nrpa, 6);
 383                         nrpa.b[5] &= 0x3f;
 384
 385                         /* The non-resolvable private address shall not be
 386                          * equal to the public address.
 387                          */
 388                         if (bacmp(&hdev->bdaddr, &nrpa))
 389                                 break;
 390                 }
 391
 392                 *own_addr_type = ADDR_LE_DEV_RANDOM;
 393                 set_random_addr(req, &nrpa);
 394                 return 0;
 395         }
 396
 397         /* If forcing static address is in use or there is no public
 398          * address use the static address as random address (but skip
 399          * the HCI command if the current random address is already the
 400          * static one.
 401          *
 402          * In case BR/EDR has been disabled on a dual-mode controller
 403          * and a static address has been configured, then use that
 404          * address instead of the public BR/EDR address.
 405          */
 406         if (hci_dev_test_flag(hdev, HCI_FORCE_STATIC_ADDR) ||
 407             !bacmp(&hdev->bdaddr, BDADDR_ANY) ||
 408             (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED) &&
 409              bacmp(&hdev->static_addr, BDADDR_ANY))) {
 410                 *own_addr_type = ADDR_LE_DEV_RANDOM;
 411                 if (bacmp(&hdev->static_addr, &hdev->random_addr))
 412                         hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
 413                                     &hdev->static_addr);
 414                 return 0;
 415         }
 416
 417         /* Neither privacy nor static address is being used so use a
 418          * public address.
 419          */
 420         *own_addr_type = ADDR_LE_DEV_PUBLIC;
 421
 422         return 0;
 423 }
 424
 425 static bool disconnected_whitelist_entries(struct hci_dev *hdev)
 426 {
 427         struct bdaddr_list *b;
 428
 429         list_for_each_entry(b, &hdev->whitelist, list) {
 430                 struct hci_conn *conn;
 431
 432                 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &b->bdaddr);
 433                 if (!conn)
 434                         return true;
 435
 436                 if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG)
 437                         return true;
 438         }
 439
 440         return false;
 441 }
 442
 443 void __hci_update_page_scan(struct hci_request *req)
 444 {
 445         struct hci_dev *hdev = req->hdev;
 446         u8 scan;
 447
 448         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
 449                 return;
 450
 451         if (!hdev_is_powered(hdev))
 452                 return;
 453
 454         if (mgmt_powering_down(hdev))
 455                 return;
 456
 457         if (hci_dev_test_flag(hdev, HCI_CONNECTABLE) ||
 458             disconnected_whitelist_entries(hdev))
 459                 scan = SCAN_PAGE;
 460         else
 461                 scan = SCAN_DISABLED;
 462
 463         if (test_bit(HCI_PSCAN, &hdev->flags) == !!(scan & SCAN_PAGE))
 464                 return;
 465
 466         if (hci_dev_test_flag(hdev, HCI_DISCOVERABLE))
 467                 scan |= SCAN_INQUIRY;
 468
 469         hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
 470 }
 471
 472 void hci_update_page_scan(struct hci_dev *hdev)
 473 {
 474         struct hci_request req;
 475
 476         hci_req_init(&req, hdev);
 477         __hci_update_page_scan(&req);
 478         hci_req_run(&req, NULL);
 479 }
 480
 481 /* This function controls the background scanning based on hdev->pend_le_conns
 482  * list. If there are pending LE connection we start the background scanning,
 483  * otherwise we stop it.
 484  *
 485  * This function requires the caller holds hdev->lock.
 486  */
 487 void __hci_update_background_scan(struct hci_request *req)
 488 {
 489         struct hci_dev *hdev = req->hdev;
 490
 491         if (!test_bit(HCI_UP, &hdev->flags) ||
 492             test_bit(HCI_INIT, &hdev->flags) ||
 493             hci_dev_test_flag(hdev, HCI_SETUP) ||
 494             hci_dev_test_flag(hdev, HCI_CONFIG) ||
 495             hci_dev_test_flag(hdev, HCI_AUTO_OFF) ||
 496             hci_dev_test_flag(hdev, HCI_UNREGISTER))
 497                 return;
 498
 499         /* No point in doing scanning if LE support hasn't been enabled */
 500         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
 501                 return;
 502
 503         /* If discovery is active don't interfere with it */
 504         if (hdev->discovery.state != DISCOVERY_STOPPED)
 505                 return;
 506
 507         /* Reset RSSI and UUID filters when starting background scanning
 508          * since these filters are meant for service discovery only.
 509          *
 510          * The Start Discovery and Start Service Discovery operations
 511          * ensure to set proper values for RSSI threshold and UUID
 512          * filter list. So it is safe to just reset them here.
 513          */
 514         hci_discovery_filter_clear(hdev);
 515
 516         if (list_empty(&hdev->pend_le_conns) &&
 517             list_empty(&hdev->pend_le_reports)) {
 518                 /* If there is no pending LE connections or devices
 519                  * to be scanned for, we should stop the background
 520                  * scanning.
 521                  */
 522
 523                 /* If controller is not scanning we are done. */
 524                 if (!hci_dev_test_flag(hdev, HCI_LE_SCAN))
 525                         return;
 526
 527                 hci_req_add_le_scan_disable(req);
 528
 529                 BT_DBG("%s stopping background scanning", hdev->name);
 530         } else {
 531                 /* If there is at least one pending LE connection, we should
 532                  * keep the background scan running.
 533                  */
 534
 535                 /* If controller is connecting, we should not start scanning
 536                  * since some controllers are not able to scan and connect at
 537                  * the same time.
 538                  */
 539                 if (hci_lookup_le_connect(hdev))
 540                         return;
 541
 542                 /* If controller is currently scanning, we stop it to ensure we
 543                  * don't miss any advertising (due to duplicates filter).
 544                  */
 545                 if (hci_dev_test_flag(hdev, HCI_LE_SCAN))
 546                         hci_req_add_le_scan_disable(req);
 547
 548                 hci_req_add_le_passive_scan(req);
 549
 550                 BT_DBG("%s starting background scanning", hdev->name);
 551         }
 552 }
 553
 554 static void update_background_scan_complete(struct hci_dev *hdev, u8 status,
 555                                             u16 opcode)
 556 {
 557         if (status)
 558                 BT_DBG("HCI request failed to update background scanning: "
 559                        "status 0x%2.2x", status);
 560 }
 561
 562 void hci_update_background_scan(struct hci_dev *hdev)
 563 {
 564         int err;
 565         struct hci_request req;
 566
 567         hci_req_init(&req, hdev);
 568
 569         __hci_update_background_scan(&req);
 570
 571         err = hci_req_run(&req, update_background_scan_complete);
 572         if (err && err != -ENODATA)
 573                 BT_ERR("Failed to run HCI request: err %d", err);
 574 }
 575
 576 void __hci_abort_conn(struct hci_request *req, struct hci_conn *conn,
 577                       u8 reason)
 578 {
 579         switch (conn->state) {
 580         case BT_CONNECTED:
 581         case BT_CONFIG:
 582                 if (conn->type == AMP_LINK) {
 583                         struct hci_cp_disconn_phy_link cp;
 584
 585                         cp.phy_handle = HCI_PHY_HANDLE(conn->handle);
 586                         cp.reason = reason;
 587                         hci_req_add(req, HCI_OP_DISCONN_PHY_LINK, sizeof(cp),
 588                                     &cp);
 589                 } else {
 590                         struct hci_cp_disconnect dc;
 591
 592                         dc.handle = cpu_to_le16(conn->handle);
 593                         dc.reason = reason;
 594                         hci_req_add(req, HCI_OP_DISCONNECT, sizeof(dc), &dc);
 595                 }
 596
 597                 conn->state = BT_DISCONN;
 598
 599                 break;
 600         case BT_CONNECT:
 601                 if (conn->type == LE_LINK) {
 602                         if (test_bit(HCI_CONN_SCANNING, &conn->flags))
 603                                 break;
 604                         hci_req_add(req, HCI_OP_LE_CREATE_CONN_CANCEL,
 605                                     0, NULL);
 606                 } else if (conn->type == ACL_LINK) {
 607                         if (req->hdev->hci_ver < BLUETOOTH_VER_1_2)
 608                                 break;
 609                         hci_req_add(req, HCI_OP_CREATE_CONN_CANCEL,
 610                                     6, &conn->dst);
 611                 }
 612                 break;
 613         case BT_CONNECT2:
 614                 if (conn->type == ACL_LINK) {
 615                         struct hci_cp_reject_conn_req rej;
 616
 617                         bacpy(&rej.bdaddr, &conn->dst);
 618                         rej.reason = reason;
 619
 620                         hci_req_add(req, HCI_OP_REJECT_CONN_REQ,
 621                                     sizeof(rej), &rej);
 622                 } else if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
 623                         struct hci_cp_reject_sync_conn_req rej;
 624
 625                         bacpy(&rej.bdaddr, &conn->dst);
 626
 627                         /* SCO rejection has its own limited set of
 628                          * allowed error values (0x0D-0x0F) which isn't
 629                          * compatible with most values passed to this
 630                          * function. To be safe hard-code one of the
 631                          * values that's suitable for SCO.
 632                          */
 633                         rej.reason = HCI_ERROR_REMOTE_LOW_RESOURCES;
 634
 635                         hci_req_add(req, HCI_OP_REJECT_SYNC_CONN_REQ,
 636                                     sizeof(rej), &rej);
 637                 }
 638                 break;
 639         default:
 640                 conn->state = BT_CLOSED;
 641                 break;
 642         }
 643 }
 644
 645 static void abort_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 646 {
 647         if (status)
 648                 BT_DBG("Failed to abort connection: status 0x%2.2x", status);
 649 }
 650
 651 int hci_abort_conn(struct hci_conn *conn, u8 reason)
 652 {
 653         struct hci_request req;
 654         int err;
 655
 656         hci_req_init(&req, conn->hdev);
 657
 658         __hci_abort_conn(&req, conn, reason);
 659
 660         err = hci_req_run(&req, abort_conn_complete);
 661         if (err && err != -ENODATA) {
 662                 BT_ERR("Failed to run HCI request: err %d", err);
 663                 return err;
 664         }
 665
 666         return 0;
 667 }