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 <[email protected]>
   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/rfkill.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/crypto.h>
  32 #include <linux/kcov.h>
  33 #include <linux/property.h>
  34 #include <linux/suspend.h>
  35 #include <linux/wait.h>
  36 #include <asm/unaligned.h>
  37
  38 #include <net/bluetooth/bluetooth.h>
  39 #include <net/bluetooth/hci_core.h>
  40 #include <net/bluetooth/l2cap.h>
  41 #include <net/bluetooth/mgmt.h>
  42
  43 #include "hci_request.h"
  44 #include "hci_debugfs.h"
  45 #include "smp.h"
  46 #include "leds.h"
  47 #include "msft.h"
  48 #include "aosp.h"
  49 #include "hci_codec.h"
  50
  51 static void hci_rx_work(struct work_struct *work);
  52 static void hci_cmd_work(struct work_struct *work);
  53 static void hci_tx_work(struct work_struct *work);
  54
  55 /* HCI device list */
  56 LIST_HEAD(hci_dev_list);
  57 DEFINE_RWLOCK(hci_dev_list_lock);
  58
  59 /* HCI callback list */
  60 LIST_HEAD(hci_cb_list);
  61 DEFINE_MUTEX(hci_cb_list_lock);
  62
  63 /* HCI ID Numbering */
  64 static DEFINE_IDA(hci_index_ida);
  65
  66 static int hci_scan_req(struct hci_request *req, unsigned long opt)
  67 {
  68         __u8 scan = opt;
  69
  70         BT_DBG("%s %x", req->hdev->name, scan);
  71
  72         /* Inquiry and Page scans */
  73         hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
  74         return 0;
  75 }
  76
  77 static int hci_auth_req(struct hci_request *req, unsigned long opt)
  78 {
  79         __u8 auth = opt;
  80
  81         BT_DBG("%s %x", req->hdev->name, auth);
  82
  83         /* Authentication */
  84         hci_req_add(req, HCI_OP_WRITE_AUTH_ENABLE, 1, &auth);
  85         return 0;
  86 }
  87
  88 static int hci_encrypt_req(struct hci_request *req, unsigned long opt)
  89 {
  90         __u8 encrypt = opt;
  91
  92         BT_DBG("%s %x", req->hdev->name, encrypt);
  93
  94         /* Encryption */
  95         hci_req_add(req, HCI_OP_WRITE_ENCRYPT_MODE, 1, &encrypt);
  96         return 0;
  97 }
  98
  99 static int hci_linkpol_req(struct hci_request *req, unsigned long opt)
 100 {
 101         __le16 policy = cpu_to_le16(opt);
 102
 103         BT_DBG("%s %x", req->hdev->name, policy);
 104
 105         /* Default link policy */
 106         hci_req_add(req, HCI_OP_WRITE_DEF_LINK_POLICY, 2, &policy);
 107         return 0;
 108 }
 109
 110 /* Get HCI device by index.
 111  * Device is held on return. */
 112 struct hci_dev *hci_dev_get(int index)
 113 {
 114         struct hci_dev *hdev = NULL, *d;
 115
 116         BT_DBG("%d", index);
 117
 118         if (index < 0)
 119                 return NULL;
 120
 121         read_lock(&hci_dev_list_lock);
 122         list_for_each_entry(d, &hci_dev_list, list) {
 123                 if (d->id == index) {
 124                         hdev = hci_dev_hold(d);
 125                         break;
 126                 }
 127         }
 128         read_unlock(&hci_dev_list_lock);
 129         return hdev;
 130 }
 131
 132 /* ---- Inquiry support ---- */
 133
 134 bool hci_discovery_active(struct hci_dev *hdev)
 135 {
 136         struct discovery_state *discov = &hdev->discovery;
 137
 138         switch (discov->state) {
 139         case DISCOVERY_FINDING:
 140         case DISCOVERY_RESOLVING:
 141                 return true;
 142
 143         default:
 144                 return false;
 145         }
 146 }
 147
 148 void hci_discovery_set_state(struct hci_dev *hdev, int state)
 149 {
 150         int old_state = hdev->discovery.state;
 151
 152         BT_DBG("%s state %u -> %u", hdev->name, hdev->discovery.state, state);
 153
 154         if (old_state == state)
 155                 return;
 156
 157         hdev->discovery.state = state;
 158
 159         switch (state) {
 160         case DISCOVERY_STOPPED:
 161                 hci_update_passive_scan(hdev);
 162
 163                 if (old_state != DISCOVERY_STARTING)
 164                         mgmt_discovering(hdev, 0);
 165                 break;
 166         case DISCOVERY_STARTING:
 167                 break;
 168         case DISCOVERY_FINDING:
 169                 mgmt_discovering(hdev, 1);
 170                 break;
 171         case DISCOVERY_RESOLVING:
 172                 break;
 173         case DISCOVERY_STOPPING:
 174                 break;
 175         }
 176 }
 177
 178 void hci_inquiry_cache_flush(struct hci_dev *hdev)
 179 {
 180         struct discovery_state *cache = &hdev->discovery;
 181         struct inquiry_entry *p, *n;
 182
 183         list_for_each_entry_safe(p, n, &cache->all, all) {
 184                 list_del(&p->all);
 185                 kfree(p);
 186         }
 187
 188         INIT_LIST_HEAD(&cache->unknown);
 189         INIT_LIST_HEAD(&cache->resolve);
 190 }
 191
 192 struct inquiry_entry *hci_inquiry_cache_lookup(struct hci_dev *hdev,
 193                                                bdaddr_t *bdaddr)
 194 {
 195         struct discovery_state *cache = &hdev->discovery;
 196         struct inquiry_entry *e;
 197
 198         BT_DBG("cache %p, %pMR", cache, bdaddr);
 199
 200         list_for_each_entry(e, &cache->all, all) {
 201                 if (!bacmp(&e->data.bdaddr, bdaddr))
 202                         return e;
 203         }
 204
 205         return NULL;
 206 }
 207
 208 struct inquiry_entry *hci_inquiry_cache_lookup_unknown(struct hci_dev *hdev,
 209                                                        bdaddr_t *bdaddr)
 210 {
 211         struct discovery_state *cache = &hdev->discovery;
 212         struct inquiry_entry *e;
 213
 214         BT_DBG("cache %p, %pMR", cache, bdaddr);
 215
 216         list_for_each_entry(e, &cache->unknown, list) {
 217                 if (!bacmp(&e->data.bdaddr, bdaddr))
 218                         return e;
 219         }
 220
 221         return NULL;
 222 }
 223
 224 struct inquiry_entry *hci_inquiry_cache_lookup_resolve(struct hci_dev *hdev,
 225                                                        bdaddr_t *bdaddr,
 226                                                        int state)
 227 {
 228         struct discovery_state *cache = &hdev->discovery;
 229         struct inquiry_entry *e;
 230
 231         BT_DBG("cache %p bdaddr %pMR state %d", cache, bdaddr, state);
 232
 233         list_for_each_entry(e, &cache->resolve, list) {
 234                 if (!bacmp(bdaddr, BDADDR_ANY) && e->name_state == state)
 235                         return e;
 236                 if (!bacmp(&e->data.bdaddr, bdaddr))
 237                         return e;
 238         }
 239
 240         return NULL;
 241 }
 242
 243 void hci_inquiry_cache_update_resolve(struct hci_dev *hdev,
 244                                       struct inquiry_entry *ie)
 245 {
 246         struct discovery_state *cache = &hdev->discovery;
 247         struct list_head *pos = &cache->resolve;
 248         struct inquiry_entry *p;
 249
 250         list_del(&ie->list);
 251
 252         list_for_each_entry(p, &cache->resolve, list) {
 253                 if (p->name_state != NAME_PENDING &&
 254                     abs(p->data.rssi) >= abs(ie->data.rssi))
 255                         break;
 256                 pos = &p->list;
 257         }
 258
 259         list_add(&ie->list, pos);
 260 }
 261
 262 u32 hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data,
 263                              bool name_known)
 264 {
 265         struct discovery_state *cache = &hdev->discovery;
 266         struct inquiry_entry *ie;
 267         u32 flags = 0;
 268
 269         BT_DBG("cache %p, %pMR", cache, &data->bdaddr);
 270
 271         hci_remove_remote_oob_data(hdev, &data->bdaddr, BDADDR_BREDR);
 272
 273         if (!data->ssp_mode)
 274                 flags |= MGMT_DEV_FOUND_LEGACY_PAIRING;
 275
 276         ie = hci_inquiry_cache_lookup(hdev, &data->bdaddr);
 277         if (ie) {
 278                 if (!ie->data.ssp_mode)
 279                         flags |= MGMT_DEV_FOUND_LEGACY_PAIRING;
 280
 281                 if (ie->name_state == NAME_NEEDED &&
 282                     data->rssi != ie->data.rssi) {
 283                         ie->data.rssi = data->rssi;
 284                         hci_inquiry_cache_update_resolve(hdev, ie);
 285                 }
 286
 287                 goto update;
 288         }
 289
 290         /* Entry not in the cache. Add new one. */
 291         ie = kzalloc(sizeof(*ie), GFP_KERNEL);
 292         if (!ie) {
 293                 flags |= MGMT_DEV_FOUND_CONFIRM_NAME;
 294                 goto done;
 295         }
 296
 297         list_add(&ie->all, &cache->all);
 298
 299         if (name_known) {
 300                 ie->name_state = NAME_KNOWN;
 301         } else {
 302                 ie->name_state = NAME_NOT_KNOWN;
 303                 list_add(&ie->list, &cache->unknown);
 304         }
 305
 306 update:
 307         if (name_known && ie->name_state != NAME_KNOWN &&
 308             ie->name_state != NAME_PENDING) {
 309                 ie->name_state = NAME_KNOWN;
 310                 list_del(&ie->list);
 311         }
 312
 313         memcpy(&ie->data, data, sizeof(*data));
 314         ie->timestamp = jiffies;
 315         cache->timestamp = jiffies;
 316
 317         if (ie->name_state == NAME_NOT_KNOWN)
 318                 flags |= MGMT_DEV_FOUND_CONFIRM_NAME;
 319
 320 done:
 321         return flags;
 322 }
 323
 324 static int inquiry_cache_dump(struct hci_dev *hdev, int num, __u8 *buf)
 325 {
 326         struct discovery_state *cache = &hdev->discovery;
 327         struct inquiry_info *info = (struct inquiry_info *) buf;
 328         struct inquiry_entry *e;
 329         int copied = 0;
 330
 331         list_for_each_entry(e, &cache->all, all) {
 332                 struct inquiry_data *data = &e->data;
 333
 334                 if (copied >= num)
 335                         break;
 336
 337                 bacpy(&info->bdaddr, &data->bdaddr);
 338                 info->pscan_rep_mode    = data->pscan_rep_mode;
 339                 info->pscan_period_mode = data->pscan_period_mode;
 340                 info->pscan_mode        = data->pscan_mode;
 341                 memcpy(info->dev_class, data->dev_class, 3);
 342                 info->clock_offset      = data->clock_offset;
 343
 344                 info++;
 345                 copied++;
 346         }
 347
 348         BT_DBG("cache %p, copied %d", cache, copied);
 349         return copied;
 350 }
 351
 352 static int hci_inq_req(struct hci_request *req, unsigned long opt)
 353 {
 354         struct hci_inquiry_req *ir = (struct hci_inquiry_req *) opt;
 355         struct hci_dev *hdev = req->hdev;
 356         struct hci_cp_inquiry cp;
 357
 358         BT_DBG("%s", hdev->name);
 359
 360         if (test_bit(HCI_INQUIRY, &hdev->flags))
 361                 return 0;
 362
 363         /* Start Inquiry */
 364         memcpy(&cp.lap, &ir->lap, 3);
 365         cp.length  = ir->length;
 366         cp.num_rsp = ir->num_rsp;
 367         hci_req_add(req, HCI_OP_INQUIRY, sizeof(cp), &cp);
 368
 369         return 0;
 370 }
 371
 372 int hci_inquiry(void __user *arg)
 373 {
 374         __u8 __user *ptr = arg;
 375         struct hci_inquiry_req ir;
 376         struct hci_dev *hdev;
 377         int err = 0, do_inquiry = 0, max_rsp;
 378         long timeo;
 379         __u8 *buf;
 380
 381         if (copy_from_user(&ir, ptr, sizeof(ir)))
 382                 return -EFAULT;
 383
 384         hdev = hci_dev_get(ir.dev_id);
 385         if (!hdev)
 386                 return -ENODEV;
 387
 388         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
 389                 err = -EBUSY;
 390                 goto done;
 391         }
 392
 393         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
 394                 err = -EOPNOTSUPP;
 395                 goto done;
 396         }
 397
 398         if (hdev->dev_type != HCI_PRIMARY) {
 399                 err = -EOPNOTSUPP;
 400                 goto done;
 401         }
 402
 403         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
 404                 err = -EOPNOTSUPP;
 405                 goto done;
 406         }
 407
 408         /* Restrict maximum inquiry length to 60 seconds */
 409         if (ir.length > 60) {
 410                 err = -EINVAL;
 411                 goto done;
 412         }
 413
 414         hci_dev_lock(hdev);
 415         if (inquiry_cache_age(hdev) > INQUIRY_CACHE_AGE_MAX ||
 416             inquiry_cache_empty(hdev) || ir.flags & IREQ_CACHE_FLUSH) {
 417                 hci_inquiry_cache_flush(hdev);
 418                 do_inquiry = 1;
 419         }
 420         hci_dev_unlock(hdev);
 421
 422         timeo = ir.length * msecs_to_jiffies(2000);
 423
 424         if (do_inquiry) {
 425                 err = hci_req_sync(hdev, hci_inq_req, (unsigned long) &ir,
 426                                    timeo, NULL);
 427                 if (err < 0)
 428                         goto done;
 429
 430                 /* Wait until Inquiry procedure finishes (HCI_INQUIRY flag is
 431                  * cleared). If it is interrupted by a signal, return -EINTR.
 432                  */
 433                 if (wait_on_bit(&hdev->flags, HCI_INQUIRY,
 434                                 TASK_INTERRUPTIBLE)) {
 435                         err = -EINTR;
 436                         goto done;
 437                 }
 438         }
 439
 440         /* for unlimited number of responses we will use buffer with
 441          * 255 entries
 442          */
 443         max_rsp = (ir.num_rsp == 0) ? 255 : ir.num_rsp;
 444
 445         /* cache_dump can't sleep. Therefore we allocate temp buffer and then
 446          * copy it to the user space.
 447          */
 448         buf = kmalloc_array(max_rsp, sizeof(struct inquiry_info), GFP_KERNEL);
 449         if (!buf) {
 450                 err = -ENOMEM;
 451                 goto done;
 452         }
 453
 454         hci_dev_lock(hdev);
 455         ir.num_rsp = inquiry_cache_dump(hdev, max_rsp, buf);
 456         hci_dev_unlock(hdev);
 457
 458         BT_DBG("num_rsp %d", ir.num_rsp);
 459
 460         if (!copy_to_user(ptr, &ir, sizeof(ir))) {
 461                 ptr += sizeof(ir);
 462                 if (copy_to_user(ptr, buf, sizeof(struct inquiry_info) *
 463                                  ir.num_rsp))
 464                         err = -EFAULT;
 465         } else
 466                 err = -EFAULT;
 467
 468         kfree(buf);
 469
 470 done:
 471         hci_dev_put(hdev);
 472         return err;
 473 }
 474
 475 static int hci_dev_do_open(struct hci_dev *hdev)
 476 {
 477         int ret = 0;
 478
 479         BT_DBG("%s %p", hdev->name, hdev);
 480
 481         hci_req_sync_lock(hdev);
 482
 483         ret = hci_dev_open_sync(hdev);
 484
 485         hci_req_sync_unlock(hdev);
 486         return ret;
 487 }
 488
 489 /* ---- HCI ioctl helpers ---- */
 490
 491 int hci_dev_open(__u16 dev)
 492 {
 493         struct hci_dev *hdev;
 494         int err;
 495
 496         hdev = hci_dev_get(dev);
 497         if (!hdev)
 498                 return -ENODEV;
 499
 500         /* Devices that are marked as unconfigured can only be powered
 501          * up as user channel. Trying to bring them up as normal devices
 502          * will result into a failure. Only user channel operation is
 503          * possible.
 504          *
 505          * When this function is called for a user channel, the flag
 506          * HCI_USER_CHANNEL will be set first before attempting to
 507          * open the device.
 508          */
 509         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
 510             !hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
 511                 err = -EOPNOTSUPP;
 512                 goto done;
 513         }
 514
 515         /* We need to ensure that no other power on/off work is pending
 516          * before proceeding to call hci_dev_do_open. This is
 517          * particularly important if the setup procedure has not yet
 518          * completed.
 519          */
 520         if (hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF))
 521                 cancel_delayed_work(&hdev->power_off);
 522
 523         /* After this call it is guaranteed that the setup procedure
 524          * has finished. This means that error conditions like RFKILL
 525          * or no valid public or static random address apply.
 526          */
 527         flush_workqueue(hdev->req_workqueue);
 528
 529         /* For controllers not using the management interface and that
 530          * are brought up using legacy ioctl, set the HCI_BONDABLE bit
 531          * so that pairing works for them. Once the management interface
 532          * is in use this bit will be cleared again and userspace has
 533          * to explicitly enable it.
 534          */
 535         if (!hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
 536             !hci_dev_test_flag(hdev, HCI_MGMT))
 537                 hci_dev_set_flag(hdev, HCI_BONDABLE);
 538
 539         err = hci_dev_do_open(hdev);
 540
 541 done:
 542         hci_dev_put(hdev);
 543         return err;
 544 }
 545
 546 int hci_dev_do_close(struct hci_dev *hdev)
 547 {
 548         int err;
 549
 550         BT_DBG("%s %p", hdev->name, hdev);
 551
 552         hci_req_sync_lock(hdev);
 553
 554         err = hci_dev_close_sync(hdev);
 555
 556         hci_req_sync_unlock(hdev);
 557
 558         return err;
 559 }
 560
 561 int hci_dev_close(__u16 dev)
 562 {
 563         struct hci_dev *hdev;
 564         int err;
 565
 566         hdev = hci_dev_get(dev);
 567         if (!hdev)
 568                 return -ENODEV;
 569
 570         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
 571                 err = -EBUSY;
 572                 goto done;
 573         }
 574
 575         cancel_work_sync(&hdev->power_on);
 576         if (hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF))
 577                 cancel_delayed_work(&hdev->power_off);
 578
 579         err = hci_dev_do_close(hdev);
 580
 581 done:
 582         hci_dev_put(hdev);
 583         return err;
 584 }
 585
 586 static int hci_dev_do_reset(struct hci_dev *hdev)
 587 {
 588         int ret;
 589
 590         BT_DBG("%s %p", hdev->name, hdev);
 591
 592         hci_req_sync_lock(hdev);
 593
 594         /* Drop queues */
 595         skb_queue_purge(&hdev->rx_q);
 596         skb_queue_purge(&hdev->cmd_q);
 597
 598         /* Cancel these to avoid queueing non-chained pending work */
 599         hci_dev_set_flag(hdev, HCI_CMD_DRAIN_WORKQUEUE);
 600         /* Wait for
 601          *
 602          *    if (!hci_dev_test_flag(hdev, HCI_CMD_DRAIN_WORKQUEUE))
 603          *        queue_delayed_work(&hdev->{cmd,ncmd}_timer)
 604          *
 605          * inside RCU section to see the flag or complete scheduling.
 606          */
 607         synchronize_rcu();
 608         /* Explicitly cancel works in case scheduled after setting the flag. */
 609         cancel_delayed_work(&hdev->cmd_timer);
 610         cancel_delayed_work(&hdev->ncmd_timer);
 611
 612         /* Avoid potential lockdep warnings from the *_flush() calls by
 613          * ensuring the workqueue is empty up front.
 614          */
 615         drain_workqueue(hdev->workqueue);
 616
 617         hci_dev_lock(hdev);
 618         hci_inquiry_cache_flush(hdev);
 619         hci_conn_hash_flush(hdev);
 620         hci_dev_unlock(hdev);
 621
 622         if (hdev->flush)
 623                 hdev->flush(hdev);
 624
 625         hci_dev_clear_flag(hdev, HCI_CMD_DRAIN_WORKQUEUE);
 626
 627         atomic_set(&hdev->cmd_cnt, 1);
 628         hdev->acl_cnt = 0;
 629         hdev->sco_cnt = 0;
 630         hdev->le_cnt = 0;
 631         hdev->iso_cnt = 0;
 632
 633         ret = hci_reset_sync(hdev);
 634
 635         hci_req_sync_unlock(hdev);
 636         return ret;
 637 }
 638
 639 int hci_dev_reset(__u16 dev)
 640 {
 641         struct hci_dev *hdev;
 642         int err;
 643
 644         hdev = hci_dev_get(dev);
 645         if (!hdev)
 646                 return -ENODEV;
 647
 648         if (!test_bit(HCI_UP, &hdev->flags)) {
 649                 err = -ENETDOWN;
 650                 goto done;
 651         }
 652
 653         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
 654                 err = -EBUSY;
 655                 goto done;
 656         }
 657
 658         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
 659                 err = -EOPNOTSUPP;
 660                 goto done;
 661         }
 662
 663         err = hci_dev_do_reset(hdev);
 664
 665 done:
 666         hci_dev_put(hdev);
 667         return err;
 668 }
 669
 670 int hci_dev_reset_stat(__u16 dev)
 671 {
 672         struct hci_dev *hdev;
 673         int ret = 0;
 674
 675         hdev = hci_dev_get(dev);
 676         if (!hdev)
 677                 return -ENODEV;
 678
 679         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
 680                 ret = -EBUSY;
 681                 goto done;
 682         }
 683
 684         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
 685                 ret = -EOPNOTSUPP;
 686                 goto done;
 687         }
 688
 689         memset(&hdev->stat, 0, sizeof(struct hci_dev_stats));
 690
 691 done:
 692         hci_dev_put(hdev);
 693         return ret;
 694 }
 695
 696 static void hci_update_passive_scan_state(struct hci_dev *hdev, u8 scan)
 697 {
 698         bool conn_changed, discov_changed;
 699
 700         BT_DBG("%s scan 0x%02x", hdev->name, scan);
 701
 702         if ((scan & SCAN_PAGE))
 703                 conn_changed = !hci_dev_test_and_set_flag(hdev,
 704                                                           HCI_CONNECTABLE);
 705         else
 706                 conn_changed = hci_dev_test_and_clear_flag(hdev,
 707                                                            HCI_CONNECTABLE);
 708
 709         if ((scan & SCAN_INQUIRY)) {
 710                 discov_changed = !hci_dev_test_and_set_flag(hdev,
 711                                                             HCI_DISCOVERABLE);
 712         } else {
 713                 hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);
 714                 discov_changed = hci_dev_test_and_clear_flag(hdev,
 715                                                              HCI_DISCOVERABLE);
 716         }
 717
 718         if (!hci_dev_test_flag(hdev, HCI_MGMT))
 719                 return;
 720
 721         if (conn_changed || discov_changed) {
 722                 /* In case this was disabled through mgmt */
 723                 hci_dev_set_flag(hdev, HCI_BREDR_ENABLED);
 724
 725                 if (hci_dev_test_flag(hdev, HCI_LE_ENABLED))
 726                         hci_update_adv_data(hdev, hdev->cur_adv_instance);
 727
 728                 mgmt_new_settings(hdev);
 729         }
 730 }
 731
 732 int hci_dev_cmd(unsigned int cmd, void __user *arg)
 733 {
 734         struct hci_dev *hdev;
 735         struct hci_dev_req dr;
 736         int err = 0;
 737
 738         if (copy_from_user(&dr, arg, sizeof(dr)))
 739                 return -EFAULT;
 740
 741         hdev = hci_dev_get(dr.dev_id);
 742         if (!hdev)
 743                 return -ENODEV;
 744
 745         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
 746                 err = -EBUSY;
 747                 goto done;
 748         }
 749
 750         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
 751                 err = -EOPNOTSUPP;
 752                 goto done;
 753         }
 754
 755         if (hdev->dev_type != HCI_PRIMARY) {
 756                 err = -EOPNOTSUPP;
 757                 goto done;
 758         }
 759
 760         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
 761                 err = -EOPNOTSUPP;
 762                 goto done;
 763         }
 764
 765         switch (cmd) {
 766         case HCISETAUTH:
 767                 err = hci_req_sync(hdev, hci_auth_req, dr.dev_opt,
 768                                    HCI_INIT_TIMEOUT, NULL);
 769                 break;
 770
 771         case HCISETENCRYPT:
 772                 if (!lmp_encrypt_capable(hdev)) {
 773                         err = -EOPNOTSUPP;
 774                         break;
 775                 }
 776
 777                 if (!test_bit(HCI_AUTH, &hdev->flags)) {
 778                         /* Auth must be enabled first */
 779                         err = hci_req_sync(hdev, hci_auth_req, dr.dev_opt,
 780                                            HCI_INIT_TIMEOUT, NULL);
 781                         if (err)
 782                                 break;
 783                 }
 784
 785                 err = hci_req_sync(hdev, hci_encrypt_req, dr.dev_opt,
 786                                    HCI_INIT_TIMEOUT, NULL);
 787                 break;
 788
 789         case HCISETSCAN:
 790                 err = hci_req_sync(hdev, hci_scan_req, dr.dev_opt,
 791                                    HCI_INIT_TIMEOUT, NULL);
 792
 793                 /* Ensure that the connectable and discoverable states
 794                  * get correctly modified as this was a non-mgmt change.
 795                  */
 796                 if (!err)
 797                         hci_update_passive_scan_state(hdev, dr.dev_opt);
 798                 break;
 799
 800         case HCISETLINKPOL:
 801                 err = hci_req_sync(hdev, hci_linkpol_req, dr.dev_opt,
 802                                    HCI_INIT_TIMEOUT, NULL);
 803                 break;
 804
 805         case HCISETLINKMODE:
 806                 hdev->link_mode = ((__u16) dr.dev_opt) &
 807                                         (HCI_LM_MASTER | HCI_LM_ACCEPT);
 808                 break;
 809
 810         case HCISETPTYPE:
 811                 if (hdev->pkt_type == (__u16) dr.dev_opt)
 812                         break;
 813
 814                 hdev->pkt_type = (__u16) dr.dev_opt;
 815                 mgmt_phy_configuration_changed(hdev, NULL);
 816                 break;
 817
 818         case HCISETACLMTU:
 819                 hdev->acl_mtu  = *((__u16 *) &dr.dev_opt + 1);
 820                 hdev->acl_pkts = *((__u16 *) &dr.dev_opt + 0);
 821                 break;
 822
 823         case HCISETSCOMTU:
 824                 hdev->sco_mtu  = *((__u16 *) &dr.dev_opt + 1);
 825                 hdev->sco_pkts = *((__u16 *) &dr.dev_opt + 0);
 826                 break;
 827
 828         default:
 829                 err = -EINVAL;
 830                 break;
 831         }
 832
 833 done:
 834         hci_dev_put(hdev);
 835         return err;
 836 }
 837
 838 int hci_get_dev_list(void __user *arg)
 839 {
 840         struct hci_dev *hdev;
 841         struct hci_dev_list_req *dl;
 842         struct hci_dev_req *dr;
 843         int n = 0, size, err;
 844         __u16 dev_num;
 845
 846         if (get_user(dev_num, (__u16 __user *) arg))
 847                 return -EFAULT;
 848
 849         if (!dev_num || dev_num > (PAGE_SIZE * 2) / sizeof(*dr))
 850                 return -EINVAL;
 851
 852         size = sizeof(*dl) + dev_num * sizeof(*dr);
 853
 854         dl = kzalloc(size, GFP_KERNEL);
 855         if (!dl)
 856                 return -ENOMEM;
 857
 858         dr = dl->dev_req;
 859
 860         read_lock(&hci_dev_list_lock);
 861         list_for_each_entry(hdev, &hci_dev_list, list) {
 862                 unsigned long flags = hdev->flags;
 863
 864                 /* When the auto-off is configured it means the transport
 865                  * is running, but in that case still indicate that the
 866                  * device is actually down.
 867                  */
 868                 if (hci_dev_test_flag(hdev, HCI_AUTO_OFF))
 869                         flags &= ~BIT(HCI_UP);
 870
 871                 (dr + n)->dev_id  = hdev->id;
 872                 (dr + n)->dev_opt = flags;
 873
 874                 if (++n >= dev_num)
 875                         break;
 876         }
 877         read_unlock(&hci_dev_list_lock);
 878
 879         dl->dev_num = n;
 880         size = sizeof(*dl) + n * sizeof(*dr);
 881
 882         err = copy_to_user(arg, dl, size);
 883         kfree(dl);
 884
 885         return err ? -EFAULT : 0;
 886 }
 887
 888 int hci_get_dev_info(void __user *arg)
 889 {
 890         struct hci_dev *hdev;
 891         struct hci_dev_info di;
 892         unsigned long flags;
 893         int err = 0;
 894
 895         if (copy_from_user(&di, arg, sizeof(di)))
 896                 return -EFAULT;
 897
 898         hdev = hci_dev_get(di.dev_id);
 899         if (!hdev)
 900                 return -ENODEV;
 901
 902         /* When the auto-off is configured it means the transport
 903          * is running, but in that case still indicate that the
 904          * device is actually down.
 905          */
 906         if (hci_dev_test_flag(hdev, HCI_AUTO_OFF))
 907                 flags = hdev->flags & ~BIT(HCI_UP);
 908         else
 909                 flags = hdev->flags;
 910
 911         strcpy(di.name, hdev->name);
 912         di.bdaddr   = hdev->bdaddr;
 913         di.type     = (hdev->bus & 0x0f) | ((hdev->dev_type & 0x03) << 4);
 914         di.flags    = flags;
 915         di.pkt_type = hdev->pkt_type;
 916         if (lmp_bredr_capable(hdev)) {
 917                 di.acl_mtu  = hdev->acl_mtu;
 918                 di.acl_pkts = hdev->acl_pkts;
 919                 di.sco_mtu  = hdev->sco_mtu;
 920                 di.sco_pkts = hdev->sco_pkts;
 921         } else {
 922                 di.acl_mtu  = hdev->le_mtu;
 923                 di.acl_pkts = hdev->le_pkts;
 924                 di.sco_mtu  = 0;
 925                 di.sco_pkts = 0;
 926         }
 927         di.link_policy = hdev->link_policy;
 928         di.link_mode   = hdev->link_mode;
 929
 930         memcpy(&di.stat, &hdev->stat, sizeof(di.stat));
 931         memcpy(&di.features, &hdev->features, sizeof(di.features));
 932
 933         if (copy_to_user(arg, &di, sizeof(di)))
 934                 err = -EFAULT;
 935
 936         hci_dev_put(hdev);
 937
 938         return err;
 939 }
 940
 941 /* ---- Interface to HCI drivers ---- */
 942
 943 static int hci_rfkill_set_block(void *data, bool blocked)
 944 {
 945         struct hci_dev *hdev = data;
 946
 947         BT_DBG("%p name %s blocked %d", hdev, hdev->name, blocked);
 948
 949         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
 950                 return -EBUSY;
 951
 952         if (blocked) {
 953                 hci_dev_set_flag(hdev, HCI_RFKILLED);
 954                 if (!hci_dev_test_flag(hdev, HCI_SETUP) &&
 955                     !hci_dev_test_flag(hdev, HCI_CONFIG))
 956                         hci_dev_do_close(hdev);
 957         } else {
 958                 hci_dev_clear_flag(hdev, HCI_RFKILLED);
 959         }
 960
 961         return 0;
 962 }
 963
 964 static const struct rfkill_ops hci_rfkill_ops = {
 965         .set_block = hci_rfkill_set_block,
 966 };
 967
 968 static void hci_power_on(struct work_struct *work)
 969 {
 970         struct hci_dev *hdev = container_of(work, struct hci_dev, power_on);
 971         int err;
 972
 973         BT_DBG("%s", hdev->name);
 974
 975         if (test_bit(HCI_UP, &hdev->flags) &&
 976             hci_dev_test_flag(hdev, HCI_MGMT) &&
 977             hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF)) {
 978                 cancel_delayed_work(&hdev->power_off);
 979                 err = hci_powered_update_sync(hdev);
 980                 mgmt_power_on(hdev, err);
 981                 return;
 982         }
 983
 984         err = hci_dev_do_open(hdev);
 985         if (err < 0) {
 986                 hci_dev_lock(hdev);
 987                 mgmt_set_powered_failed(hdev, err);
 988                 hci_dev_unlock(hdev);
 989                 return;
 990         }
 991
 992         /* During the HCI setup phase, a few error conditions are
 993          * ignored and they need to be checked now. If they are still
 994          * valid, it is important to turn the device back off.
 995          */
 996         if (hci_dev_test_flag(hdev, HCI_RFKILLED) ||
 997             hci_dev_test_flag(hdev, HCI_UNCONFIGURED) ||
 998             (hdev->dev_type == HCI_PRIMARY &&
 999              !bacmp(&hdev->bdaddr, BDADDR_ANY) &&
1000              !bacmp(&hdev->static_addr, BDADDR_ANY))) {
1001                 hci_dev_clear_flag(hdev, HCI_AUTO_OFF);
1002                 hci_dev_do_close(hdev);
1003         } else if (hci_dev_test_flag(hdev, HCI_AUTO_OFF)) {
1004                 queue_delayed_work(hdev->req_workqueue, &hdev->power_off,
1005                                    HCI_AUTO_OFF_TIMEOUT);
1006         }
1007
1008         if (hci_dev_test_and_clear_flag(hdev, HCI_SETUP)) {
1009                 /* For unconfigured devices, set the HCI_RAW flag
1010                  * so that userspace can easily identify them.
1011                  */
1012                 if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
1013                         set_bit(HCI_RAW, &hdev->flags);
1014
1015                 /* For fully configured devices, this will send
1016                  * the Index Added event. For unconfigured devices,
1017                  * it will send Unconfigued Index Added event.
1018                  *
1019                  * Devices with HCI_QUIRK_RAW_DEVICE are ignored
1020                  * and no event will be send.
1021                  */
1022                 mgmt_index_added(hdev);
1023         } else if (hci_dev_test_and_clear_flag(hdev, HCI_CONFIG)) {
1024                 /* When the controller is now configured, then it
1025                  * is important to clear the HCI_RAW flag.
1026                  */
1027                 if (!hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
1028                         clear_bit(HCI_RAW, &hdev->flags);
1029
1030                 /* Powering on the controller with HCI_CONFIG set only
1031                  * happens with the transition from unconfigured to
1032                  * configured. This will send the Index Added event.
1033                  */
1034                 mgmt_index_added(hdev);
1035         }
1036 }
1037
1038 static void hci_power_off(struct work_struct *work)
1039 {
1040         struct hci_dev *hdev = container_of(work, struct hci_dev,
1041                                             power_off.work);
1042
1043         BT_DBG("%s", hdev->name);
1044
1045         hci_dev_do_close(hdev);
1046 }
1047
1048 static void hci_error_reset(struct work_struct *work)
1049 {
1050         struct hci_dev *hdev = container_of(work, struct hci_dev, error_reset);
1051
1052         BT_DBG("%s", hdev->name);
1053
1054         if (hdev->hw_error)
1055                 hdev->hw_error(hdev, hdev->hw_error_code);
1056         else
1057                 bt_dev_err(hdev, "hardware error 0x%2.2x", hdev->hw_error_code);
1058
1059         if (hci_dev_do_close(hdev))
1060                 return;
1061
1062         hci_dev_do_open(hdev);
1063 }
1064
1065 void hci_uuids_clear(struct hci_dev *hdev)
1066 {
1067         struct bt_uuid *uuid, *tmp;
1068
1069         list_for_each_entry_safe(uuid, tmp, &hdev->uuids, list) {
1070                 list_del(&uuid->list);
1071                 kfree(uuid);
1072         }
1073 }
1074
1075 void hci_link_keys_clear(struct hci_dev *hdev)
1076 {
1077         struct link_key *key;
1078
1079         list_for_each_entry(key, &hdev->link_keys, list) {
1080                 list_del_rcu(&key->list);
1081                 kfree_rcu(key, rcu);
1082         }
1083 }
1084
1085 void hci_smp_ltks_clear(struct hci_dev *hdev)
1086 {
1087         struct smp_ltk *k;
1088
1089         list_for_each_entry(k, &hdev->long_term_keys, list) {
1090                 list_del_rcu(&k->list);
1091                 kfree_rcu(k, rcu);
1092         }
1093 }
1094
1095 void hci_smp_irks_clear(struct hci_dev *hdev)
1096 {
1097         struct smp_irk *k;
1098
1099         list_for_each_entry(k, &hdev->identity_resolving_keys, list) {
1100                 list_del_rcu(&k->list);
1101                 kfree_rcu(k, rcu);
1102         }
1103 }
1104
1105 void hci_blocked_keys_clear(struct hci_dev *hdev)
1106 {
1107         struct blocked_key *b;
1108
1109         list_for_each_entry(b, &hdev->blocked_keys, list) {
1110                 list_del_rcu(&b->list);
1111                 kfree_rcu(b, rcu);
1112         }
1113 }
1114
1115 bool hci_is_blocked_key(struct hci_dev *hdev, u8 type, u8 val[16])
1116 {
1117         bool blocked = false;
1118         struct blocked_key *b;
1119
1120         rcu_read_lock();
1121         list_for_each_entry_rcu(b, &hdev->blocked_keys, list) {
1122                 if (b->type == type && !memcmp(b->val, val, sizeof(b->val))) {
1123                         blocked = true;
1124                         break;
1125                 }
1126         }
1127
1128         rcu_read_unlock();
1129         return blocked;
1130 }
1131
1132 struct link_key *hci_find_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)
1133 {
1134         struct link_key *k;
1135
1136         rcu_read_lock();
1137         list_for_each_entry_rcu(k, &hdev->link_keys, list) {
1138                 if (bacmp(bdaddr, &k->bdaddr) == 0) {
1139                         rcu_read_unlock();
1140
1141                         if (hci_is_blocked_key(hdev,
1142                                                HCI_BLOCKED_KEY_TYPE_LINKKEY,
1143                                                k->val)) {
1144                                 bt_dev_warn_ratelimited(hdev,
1145                                                         "Link key blocked for %pMR",
1146                                                         &k->bdaddr);
1147                                 return NULL;
1148                         }
1149
1150                         return k;
1151                 }
1152         }
1153         rcu_read_unlock();
1154
1155         return NULL;
1156 }
1157
1158 static bool hci_persistent_key(struct hci_dev *hdev, struct hci_conn *conn,
1159                                u8 key_type, u8 old_key_type)
1160 {
1161         /* Legacy key */
1162         if (key_type < 0x03)
1163                 return true;
1164
1165         /* Debug keys are insecure so don't store them persistently */
1166         if (key_type == HCI_LK_DEBUG_COMBINATION)
1167                 return false;
1168
1169         /* Changed combination key and there's no previous one */
1170         if (key_type == HCI_LK_CHANGED_COMBINATION && old_key_type == 0xff)
1171                 return false;
1172
1173         /* Security mode 3 case */
1174         if (!conn)
1175                 return true;
1176
1177         /* BR/EDR key derived using SC from an LE link */
1178         if (conn->type == LE_LINK)
1179                 return true;
1180
1181         /* Neither local nor remote side had no-bonding as requirement */
1182         if (conn->auth_type > 0x01 && conn->remote_auth > 0x01)
1183                 return true;
1184
1185         /* Local side had dedicated bonding as requirement */
1186         if (conn->auth_type == 0x02 || conn->auth_type == 0x03)
1187                 return true;
1188
1189         /* Remote side had dedicated bonding as requirement */
1190         if (conn->remote_auth == 0x02 || conn->remote_auth == 0x03)
1191                 return true;
1192
1193         /* If none of the above criteria match, then don't store the key
1194          * persistently */
1195         return false;
1196 }
1197
1198 static u8 ltk_role(u8 type)
1199 {
1200         if (type == SMP_LTK)
1201                 return HCI_ROLE_MASTER;
1202
1203         return HCI_ROLE_SLAVE;
1204 }
1205
1206 struct smp_ltk *hci_find_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr,
1207                              u8 addr_type, u8 role)
1208 {
1209         struct smp_ltk *k;
1210
1211         rcu_read_lock();
1212         list_for_each_entry_rcu(k, &hdev->long_term_keys, list) {
1213                 if (addr_type != k->bdaddr_type || bacmp(bdaddr, &k->bdaddr))
1214                         continue;
1215
1216                 if (smp_ltk_is_sc(k) || ltk_role(k->type) == role) {
1217                         rcu_read_unlock();
1218
1219                         if (hci_is_blocked_key(hdev, HCI_BLOCKED_KEY_TYPE_LTK,
1220                                                k->val)) {
1221                                 bt_dev_warn_ratelimited(hdev,
1222                                                         "LTK blocked for %pMR",
1223                                                         &k->bdaddr);
1224                                 return NULL;
1225                         }
1226
1227                         return k;
1228                 }
1229         }
1230         rcu_read_unlock();
1231
1232         return NULL;
1233 }
1234
1235 struct smp_irk *hci_find_irk_by_rpa(struct hci_dev *hdev, bdaddr_t *rpa)
1236 {
1237         struct smp_irk *irk_to_return = NULL;
1238         struct smp_irk *irk;
1239
1240         rcu_read_lock();
1241         list_for_each_entry_rcu(irk, &hdev->identity_resolving_keys, list) {
1242                 if (!bacmp(&irk->rpa, rpa)) {
1243                         irk_to_return = irk;
1244                         goto done;
1245                 }
1246         }
1247
1248         list_for_each_entry_rcu(irk, &hdev->identity_resolving_keys, list) {
1249                 if (smp_irk_matches(hdev, irk->val, rpa)) {
1250                         bacpy(&irk->rpa, rpa);
1251                         irk_to_return = irk;
1252                         goto done;
1253                 }
1254         }
1255
1256 done:
1257         if (irk_to_return && hci_is_blocked_key(hdev, HCI_BLOCKED_KEY_TYPE_IRK,
1258                                                 irk_to_return->val)) {
1259                 bt_dev_warn_ratelimited(hdev, "Identity key blocked for %pMR",
1260                                         &irk_to_return->bdaddr);
1261                 irk_to_return = NULL;
1262         }
1263
1264         rcu_read_unlock();
1265
1266         return irk_to_return;
1267 }
1268
1269 struct smp_irk *hci_find_irk_by_addr(struct hci_dev *hdev, bdaddr_t *bdaddr,
1270                                      u8 addr_type)
1271 {
1272         struct smp_irk *irk_to_return = NULL;
1273         struct smp_irk *irk;
1274
1275         /* Identity Address must be public or static random */
1276         if (addr_type == ADDR_LE_DEV_RANDOM && (bdaddr->b[5] & 0xc0) != 0xc0)
1277                 return NULL;
1278
1279         rcu_read_lock();
1280         list_for_each_entry_rcu(irk, &hdev->identity_resolving_keys, list) {
1281                 if (addr_type == irk->addr_type &&
1282                     bacmp(bdaddr, &irk->bdaddr) == 0) {
1283                         irk_to_return = irk;
1284                         goto done;
1285                 }
1286         }
1287
1288 done:
1289
1290         if (irk_to_return && hci_is_blocked_key(hdev, HCI_BLOCKED_KEY_TYPE_IRK,
1291                                                 irk_to_return->val)) {
1292                 bt_dev_warn_ratelimited(hdev, "Identity key blocked for %pMR",
1293                                         &irk_to_return->bdaddr);
1294                 irk_to_return = NULL;
1295         }
1296
1297         rcu_read_unlock();
1298
1299         return irk_to_return;
1300 }
1301
1302 struct link_key *hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn,
1303                                   bdaddr_t *bdaddr, u8 *val, u8 type,
1304                                   u8 pin_len, bool *persistent)
1305 {
1306         struct link_key *key, *old_key;
1307         u8 old_key_type;
1308
1309         old_key = hci_find_link_key(hdev, bdaddr);
1310         if (old_key) {
1311                 old_key_type = old_key->type;
1312                 key = old_key;
1313         } else {
1314                 old_key_type = conn ? conn->key_type : 0xff;
1315                 key = kzalloc(sizeof(*key), GFP_KERNEL);
1316                 if (!key)
1317                         return NULL;
1318                 list_add_rcu(&key->list, &hdev->link_keys);
1319         }
1320
1321         BT_DBG("%s key for %pMR type %u", hdev->name, bdaddr, type);
1322
1323         /* Some buggy controller combinations generate a changed
1324          * combination key for legacy pairing even when there's no
1325          * previous key */
1326         if (type == HCI_LK_CHANGED_COMBINATION &&
1327             (!conn || conn->remote_auth == 0xff) && old_key_type == 0xff) {
1328                 type = HCI_LK_COMBINATION;
1329                 if (conn)
1330                         conn->key_type = type;
1331         }
1332
1333         bacpy(&key->bdaddr, bdaddr);
1334         memcpy(key->val, val, HCI_LINK_KEY_SIZE);
1335         key->pin_len = pin_len;
1336
1337         if (type == HCI_LK_CHANGED_COMBINATION)
1338                 key->type = old_key_type;
1339         else
1340                 key->type = type;
1341
1342         if (persistent)
1343                 *persistent = hci_persistent_key(hdev, conn, type,
1344                                                  old_key_type);
1345
1346         return key;
1347 }
1348
1349 struct smp_ltk *hci_add_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr,
1350                             u8 addr_type, u8 type, u8 authenticated,
1351                             u8 tk[16], u8 enc_size, __le16 ediv, __le64 rand)
1352 {
1353         struct smp_ltk *key, *old_key;
1354         u8 role = ltk_role(type);
1355
1356         old_key = hci_find_ltk(hdev, bdaddr, addr_type, role);
1357         if (old_key)
1358                 key = old_key;
1359         else {
1360                 key = kzalloc(sizeof(*key), GFP_KERNEL);
1361                 if (!key)
1362                         return NULL;
1363                 list_add_rcu(&key->list, &hdev->long_term_keys);
1364         }
1365
1366         bacpy(&key->bdaddr, bdaddr);
1367         key->bdaddr_type = addr_type;
1368         memcpy(key->val, tk, sizeof(key->val));
1369         key->authenticated = authenticated;
1370         key->ediv = ediv;
1371         key->rand = rand;
1372         key->enc_size = enc_size;
1373         key->type = type;
1374
1375         return key;
1376 }
1377
1378 struct smp_irk *hci_add_irk(struct hci_dev *hdev, bdaddr_t *bdaddr,
1379                             u8 addr_type, u8 val[16], bdaddr_t *rpa)
1380 {
1381         struct smp_irk *irk;
1382
1383         irk = hci_find_irk_by_addr(hdev, bdaddr, addr_type);
1384         if (!irk) {
1385                 irk = kzalloc(sizeof(*irk), GFP_KERNEL);
1386                 if (!irk)
1387                         return NULL;
1388
1389                 bacpy(&irk->bdaddr, bdaddr);
1390                 irk->addr_type = addr_type;
1391
1392                 list_add_rcu(&irk->list, &hdev->identity_resolving_keys);
1393         }
1394
1395         memcpy(irk->val, val, 16);
1396         bacpy(&irk->rpa, rpa);
1397
1398         return irk;
1399 }
1400
1401 int hci_remove_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)
1402 {
1403         struct link_key *key;
1404
1405         key = hci_find_link_key(hdev, bdaddr);
1406         if (!key)
1407                 return -ENOENT;
1408
1409         BT_DBG("%s removing %pMR", hdev->name, bdaddr);
1410
1411         list_del_rcu(&key->list);
1412         kfree_rcu(key, rcu);
1413
1414         return 0;
1415 }
1416
1417 int hci_remove_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 bdaddr_type)
1418 {
1419         struct smp_ltk *k;
1420         int removed = 0;
1421
1422         list_for_each_entry_rcu(k, &hdev->long_term_keys, list) {
1423                 if (bacmp(bdaddr, &k->bdaddr) || k->bdaddr_type != bdaddr_type)
1424                         continue;
1425
1426                 BT_DBG("%s removing %pMR", hdev->name, bdaddr);
1427
1428                 list_del_rcu(&k->list);
1429                 kfree_rcu(k, rcu);
1430                 removed++;
1431         }
1432
1433         return removed ? 0 : -ENOENT;
1434 }
1435
1436 void hci_remove_irk(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 addr_type)
1437 {
1438         struct smp_irk *k;
1439
1440         list_for_each_entry_rcu(k, &hdev->identity_resolving_keys, list) {
1441                 if (bacmp(bdaddr, &k->bdaddr) || k->addr_type != addr_type)
1442                         continue;
1443
1444                 BT_DBG("%s removing %pMR", hdev->name, bdaddr);
1445
1446                 list_del_rcu(&k->list);
1447                 kfree_rcu(k, rcu);
1448         }
1449 }
1450
1451 bool hci_bdaddr_is_paired(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
1452 {
1453         struct smp_ltk *k;
1454         struct smp_irk *irk;
1455         u8 addr_type;
1456
1457         if (type == BDADDR_BREDR) {
1458                 if (hci_find_link_key(hdev, bdaddr))
1459                         return true;
1460                 return false;
1461         }
1462
1463         /* Convert to HCI addr type which struct smp_ltk uses */
1464         if (type == BDADDR_LE_PUBLIC)
1465                 addr_type = ADDR_LE_DEV_PUBLIC;
1466         else
1467                 addr_type = ADDR_LE_DEV_RANDOM;
1468
1469         irk = hci_get_irk(hdev, bdaddr, addr_type);
1470         if (irk) {
1471                 bdaddr = &irk->bdaddr;
1472                 addr_type = irk->addr_type;
1473         }
1474
1475         rcu_read_lock();
1476         list_for_each_entry_rcu(k, &hdev->long_term_keys, list) {
1477                 if (k->bdaddr_type == addr_type && !bacmp(bdaddr, &k->bdaddr)) {
1478                         rcu_read_unlock();
1479                         return true;
1480                 }
1481         }
1482         rcu_read_unlock();
1483
1484         return false;
1485 }
1486
1487 /* HCI command timer function */
1488 static void hci_cmd_timeout(struct work_struct *work)
1489 {
1490         struct hci_dev *hdev = container_of(work, struct hci_dev,
1491                                             cmd_timer.work);
1492
1493         if (hdev->sent_cmd) {
1494                 struct hci_command_hdr *sent = (void *) hdev->sent_cmd->data;
1495                 u16 opcode = __le16_to_cpu(sent->opcode);
1496
1497                 bt_dev_err(hdev, "command 0x%4.4x tx timeout", opcode);
1498         } else {
1499                 bt_dev_err(hdev, "command tx timeout");
1500         }
1501
1502         if (hdev->cmd_timeout)
1503                 hdev->cmd_timeout(hdev);
1504
1505         atomic_set(&hdev->cmd_cnt, 1);
1506         queue_work(hdev->workqueue, &hdev->cmd_work);
1507 }
1508
1509 /* HCI ncmd timer function */
1510 static void hci_ncmd_timeout(struct work_struct *work)
1511 {
1512         struct hci_dev *hdev = container_of(work, struct hci_dev,
1513                                             ncmd_timer.work);
1514
1515         bt_dev_err(hdev, "Controller not accepting commands anymore: ncmd = 0");
1516
1517         /* During HCI_INIT phase no events can be injected if the ncmd timer
1518          * triggers since the procedure has its own timeout handling.
1519          */
1520         if (test_bit(HCI_INIT, &hdev->flags))
1521                 return;
1522
1523         /* This is an irrecoverable state, inject hardware error event */
1524         hci_reset_dev(hdev);
1525 }
1526
1527 struct oob_data *hci_find_remote_oob_data(struct hci_dev *hdev,
1528                                           bdaddr_t *bdaddr, u8 bdaddr_type)
1529 {
1530         struct oob_data *data;
1531
1532         list_for_each_entry(data, &hdev->remote_oob_data, list) {
1533                 if (bacmp(bdaddr, &data->bdaddr) != 0)
1534                         continue;
1535                 if (data->bdaddr_type != bdaddr_type)
1536                         continue;
1537                 return data;
1538         }
1539
1540         return NULL;
1541 }
1542
1543 int hci_remove_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr,
1544                                u8 bdaddr_type)
1545 {
1546         struct oob_data *data;
1547
1548         data = hci_find_remote_oob_data(hdev, bdaddr, bdaddr_type);
1549         if (!data)
1550                 return -ENOENT;
1551
1552         BT_DBG("%s removing %pMR (%u)", hdev->name, bdaddr, bdaddr_type);
1553
1554         list_del(&data->list);
1555         kfree(data);
1556
1557         return 0;
1558 }
1559
1560 void hci_remote_oob_data_clear(struct hci_dev *hdev)
1561 {
1562         struct oob_data *data, *n;
1563
1564         list_for_each_entry_safe(data, n, &hdev->remote_oob_data, list) {
1565                 list_del(&data->list);
1566                 kfree(data);
1567         }
1568 }
1569
1570 int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr,
1571                             u8 bdaddr_type, u8 *hash192, u8 *rand192,
1572                             u8 *hash256, u8 *rand256)
1573 {
1574         struct oob_data *data;
1575
1576         data = hci_find_remote_oob_data(hdev, bdaddr, bdaddr_type);
1577         if (!data) {
1578                 data = kmalloc(sizeof(*data), GFP_KERNEL);
1579                 if (!data)
1580                         return -ENOMEM;
1581
1582                 bacpy(&data->bdaddr, bdaddr);
1583                 data->bdaddr_type = bdaddr_type;
1584                 list_add(&data->list, &hdev->remote_oob_data);
1585         }
1586
1587         if (hash192 && rand192) {
1588                 memcpy(data->hash192, hash192, sizeof(data->hash192));
1589                 memcpy(data->rand192, rand192, sizeof(data->rand192));
1590                 if (hash256 && rand256)
1591                         data->present = 0x03;
1592         } else {
1593                 memset(data->hash192, 0, sizeof(data->hash192));
1594                 memset(data->rand192, 0, sizeof(data->rand192));
1595                 if (hash256 && rand256)
1596                         data->present = 0x02;
1597                 else
1598                         data->present = 0x00;
1599         }
1600
1601         if (hash256 && rand256) {
1602                 memcpy(data->hash256, hash256, sizeof(data->hash256));
1603                 memcpy(data->rand256, rand256, sizeof(data->rand256));
1604         } else {
1605                 memset(data->hash256, 0, sizeof(data->hash256));
1606                 memset(data->rand256, 0, sizeof(data->rand256));
1607                 if (hash192 && rand192)
1608                         data->present = 0x01;
1609         }
1610
1611         BT_DBG("%s for %pMR", hdev->name, bdaddr);
1612
1613         return 0;
1614 }
1615
1616 /* This function requires the caller holds hdev->lock */
1617 struct adv_info *hci_find_adv_instance(struct hci_dev *hdev, u8 instance)
1618 {
1619         struct adv_info *adv_instance;
1620
1621         list_for_each_entry(adv_instance, &hdev->adv_instances, list) {
1622                 if (adv_instance->instance == instance)
1623                         return adv_instance;
1624         }
1625
1626         return NULL;
1627 }
1628
1629 /* This function requires the caller holds hdev->lock */
1630 struct adv_info *hci_get_next_instance(struct hci_dev *hdev, u8 instance)
1631 {
1632         struct adv_info *cur_instance;
1633
1634         cur_instance = hci_find_adv_instance(hdev, instance);
1635         if (!cur_instance)
1636                 return NULL;
1637
1638         if (cur_instance == list_last_entry(&hdev->adv_instances,
1639                                             struct adv_info, list))
1640                 return list_first_entry(&hdev->adv_instances,
1641                                                  struct adv_info, list);
1642         else
1643                 return list_next_entry(cur_instance, list);
1644 }
1645
1646 /* This function requires the caller holds hdev->lock */
1647 int hci_remove_adv_instance(struct hci_dev *hdev, u8 instance)
1648 {
1649         struct adv_info *adv_instance;
1650
1651         adv_instance = hci_find_adv_instance(hdev, instance);
1652         if (!adv_instance)
1653                 return -ENOENT;
1654
1655         BT_DBG("%s removing %dMR", hdev->name, instance);
1656
1657         if (hdev->cur_adv_instance == instance) {
1658                 if (hdev->adv_instance_timeout) {
1659                         cancel_delayed_work(&hdev->adv_instance_expire);
1660                         hdev->adv_instance_timeout = 0;
1661                 }
1662                 hdev->cur_adv_instance = 0x00;
1663         }
1664
1665         cancel_delayed_work_sync(&adv_instance->rpa_expired_cb);
1666
1667         list_del(&adv_instance->list);
1668         kfree(adv_instance);
1669
1670         hdev->adv_instance_cnt--;
1671
1672         return 0;
1673 }
1674
1675 void hci_adv_instances_set_rpa_expired(struct hci_dev *hdev, bool rpa_expired)
1676 {
1677         struct adv_info *adv_instance, *n;
1678
1679         list_for_each_entry_safe(adv_instance, n, &hdev->adv_instances, list)
1680                 adv_instance->rpa_expired = rpa_expired;
1681 }
1682
1683 /* This function requires the caller holds hdev->lock */
1684 void hci_adv_instances_clear(struct hci_dev *hdev)
1685 {
1686         struct adv_info *adv_instance, *n;
1687
1688         if (hdev->adv_instance_timeout) {
1689                 cancel_delayed_work(&hdev->adv_instance_expire);
1690                 hdev->adv_instance_timeout = 0;
1691         }
1692
1693         list_for_each_entry_safe(adv_instance, n, &hdev->adv_instances, list) {
1694                 cancel_delayed_work_sync(&adv_instance->rpa_expired_cb);
1695                 list_del(&adv_instance->list);
1696                 kfree(adv_instance);
1697         }
1698
1699         hdev->adv_instance_cnt = 0;
1700         hdev->cur_adv_instance = 0x00;
1701 }
1702
1703 static void adv_instance_rpa_expired(struct work_struct *work)
1704 {
1705         struct adv_info *adv_instance = container_of(work, struct adv_info,
1706                                                      rpa_expired_cb.work);
1707
1708         BT_DBG("");
1709
1710         adv_instance->rpa_expired = true;
1711 }
1712
1713 /* This function requires the caller holds hdev->lock */
1714 struct adv_info *hci_add_adv_instance(struct hci_dev *hdev, u8 instance,
1715                                       u32 flags, u16 adv_data_len, u8 *adv_data,
1716                                       u16 scan_rsp_len, u8 *scan_rsp_data,
1717                                       u16 timeout, u16 duration, s8 tx_power,
1718                                       u32 min_interval, u32 max_interval,
1719                                       u8 mesh_handle)
1720 {
1721         struct adv_info *adv;
1722
1723         adv = hci_find_adv_instance(hdev, instance);
1724         if (adv) {
1725                 memset(adv->adv_data, 0, sizeof(adv->adv_data));
1726                 memset(adv->scan_rsp_data, 0, sizeof(adv->scan_rsp_data));
1727                 memset(adv->per_adv_data, 0, sizeof(adv->per_adv_data));
1728         } else {
1729                 if (hdev->adv_instance_cnt >= hdev->le_num_of_adv_sets ||
1730                     instance < 1 || instance > hdev->le_num_of_adv_sets + 1)
1731                         return ERR_PTR(-EOVERFLOW);
1732
1733                 adv = kzalloc(sizeof(*adv), GFP_KERNEL);
1734                 if (!adv)
1735                         return ERR_PTR(-ENOMEM);
1736
1737                 adv->pending = true;
1738                 adv->instance = instance;
1739                 list_add(&adv->list, &hdev->adv_instances);
1740                 hdev->adv_instance_cnt++;
1741         }
1742
1743         adv->flags = flags;
1744         adv->min_interval = min_interval;
1745         adv->max_interval = max_interval;
1746         adv->tx_power = tx_power;
1747         /* Defining a mesh_handle changes the timing units to ms,
1748          * rather than seconds, and ties the instance to the requested
1749          * mesh_tx queue.
1750          */
1751         adv->mesh = mesh_handle;
1752
1753         hci_set_adv_instance_data(hdev, instance, adv_data_len, adv_data,
1754                                   scan_rsp_len, scan_rsp_data);
1755
1756         adv->timeout = timeout;
1757         adv->remaining_time = timeout;
1758
1759         if (duration == 0)
1760                 adv->duration = hdev->def_multi_adv_rotation_duration;
1761         else
1762                 adv->duration = duration;
1763
1764         INIT_DELAYED_WORK(&adv->rpa_expired_cb, adv_instance_rpa_expired);
1765
1766         BT_DBG("%s for %dMR", hdev->name, instance);
1767
1768         return adv;
1769 }
1770
1771 /* This function requires the caller holds hdev->lock */
1772 struct adv_info *hci_add_per_instance(struct hci_dev *hdev, u8 instance,
1773                                       u32 flags, u8 data_len, u8 *data,
1774                                       u32 min_interval, u32 max_interval)
1775 {
1776         struct adv_info *adv;
1777
1778         adv = hci_add_adv_instance(hdev, instance, flags, 0, NULL, 0, NULL,
1779                                    0, 0, HCI_ADV_TX_POWER_NO_PREFERENCE,
1780                                    min_interval, max_interval, 0);
1781         if (IS_ERR(adv))
1782                 return adv;
1783
1784         adv->periodic = true;
1785         adv->per_adv_data_len = data_len;
1786
1787         if (data)
1788                 memcpy(adv->per_adv_data, data, data_len);
1789
1790         return adv;
1791 }
1792
1793 /* This function requires the caller holds hdev->lock */
1794 int hci_set_adv_instance_data(struct hci_dev *hdev, u8 instance,
1795                               u16 adv_data_len, u8 *adv_data,
1796                               u16 scan_rsp_len, u8 *scan_rsp_data)
1797 {
1798         struct adv_info *adv;
1799
1800         adv = hci_find_adv_instance(hdev, instance);
1801
1802         /* If advertisement doesn't exist, we can't modify its data */
1803         if (!adv)
1804                 return -ENOENT;
1805
1806         if (adv_data_len && ADV_DATA_CMP(adv, adv_data, adv_data_len)) {
1807                 memset(adv->adv_data, 0, sizeof(adv->adv_data));
1808                 memcpy(adv->adv_data, adv_data, adv_data_len);
1809                 adv->adv_data_len = adv_data_len;
1810                 adv->adv_data_changed = true;
1811         }
1812
1813         if (scan_rsp_len && SCAN_RSP_CMP(adv, scan_rsp_data, scan_rsp_len)) {
1814                 memset(adv->scan_rsp_data, 0, sizeof(adv->scan_rsp_data));
1815                 memcpy(adv->scan_rsp_data, scan_rsp_data, scan_rsp_len);
1816                 adv->scan_rsp_len = scan_rsp_len;
1817                 adv->scan_rsp_changed = true;
1818         }
1819
1820         /* Mark as changed if there are flags which would affect it */
1821         if (((adv->flags & MGMT_ADV_FLAG_APPEARANCE) && hdev->appearance) ||
1822             adv->flags & MGMT_ADV_FLAG_LOCAL_NAME)
1823                 adv->scan_rsp_changed = true;
1824
1825         return 0;
1826 }
1827
1828 /* This function requires the caller holds hdev->lock */
1829 u32 hci_adv_instance_flags(struct hci_dev *hdev, u8 instance)
1830 {
1831         u32 flags;
1832         struct adv_info *adv;
1833
1834         if (instance == 0x00) {
1835                 /* Instance 0 always manages the "Tx Power" and "Flags"
1836                  * fields
1837                  */
1838                 flags = MGMT_ADV_FLAG_TX_POWER | MGMT_ADV_FLAG_MANAGED_FLAGS;
1839
1840                 /* For instance 0, the HCI_ADVERTISING_CONNECTABLE setting
1841                  * corresponds to the "connectable" instance flag.
1842                  */
1843                 if (hci_dev_test_flag(hdev, HCI_ADVERTISING_CONNECTABLE))
1844                         flags |= MGMT_ADV_FLAG_CONNECTABLE;
1845
1846                 if (hci_dev_test_flag(hdev, HCI_LIMITED_DISCOVERABLE))
1847                         flags |= MGMT_ADV_FLAG_LIMITED_DISCOV;
1848                 else if (hci_dev_test_flag(hdev, HCI_DISCOVERABLE))
1849                         flags |= MGMT_ADV_FLAG_DISCOV;
1850
1851                 return flags;
1852         }
1853
1854         adv = hci_find_adv_instance(hdev, instance);
1855
1856         /* Return 0 when we got an invalid instance identifier. */
1857         if (!adv)
1858                 return 0;
1859
1860         return adv->flags;
1861 }
1862
1863 bool hci_adv_instance_is_scannable(struct hci_dev *hdev, u8 instance)
1864 {
1865         struct adv_info *adv;
1866
1867         /* Instance 0x00 always set local name */
1868         if (instance == 0x00)
1869                 return true;
1870
1871         adv = hci_find_adv_instance(hdev, instance);
1872         if (!adv)
1873                 return false;
1874
1875         if (adv->flags & MGMT_ADV_FLAG_APPEARANCE ||
1876             adv->flags & MGMT_ADV_FLAG_LOCAL_NAME)
1877                 return true;
1878
1879         return adv->scan_rsp_len ? true : false;
1880 }
1881
1882 /* This function requires the caller holds hdev->lock */
1883 void hci_adv_monitors_clear(struct hci_dev *hdev)
1884 {
1885         struct adv_monitor *monitor;
1886         int handle;
1887
1888         idr_for_each_entry(&hdev->adv_monitors_idr, monitor, handle)
1889                 hci_free_adv_monitor(hdev, monitor);
1890
1891         idr_destroy(&hdev->adv_monitors_idr);
1892 }
1893
1894 /* Frees the monitor structure and do some bookkeepings.
1895  * This function requires the caller holds hdev->lock.
1896  */
1897 void hci_free_adv_monitor(struct hci_dev *hdev, struct adv_monitor *monitor)
1898 {
1899         struct adv_pattern *pattern;
1900         struct adv_pattern *tmp;
1901
1902         if (!monitor)
1903                 return;
1904
1905         list_for_each_entry_safe(pattern, tmp, &monitor->patterns, list) {
1906                 list_del(&pattern->list);
1907                 kfree(pattern);
1908         }
1909
1910         if (monitor->handle)
1911                 idr_remove(&hdev->adv_monitors_idr, monitor->handle);
1912
1913         if (monitor->state != ADV_MONITOR_STATE_NOT_REGISTERED) {
1914                 hdev->adv_monitors_cnt--;
1915                 mgmt_adv_monitor_removed(hdev, monitor->handle);
1916         }
1917
1918         kfree(monitor);
1919 }
1920
1921 /* Assigns handle to a monitor, and if offloading is supported and power is on,
1922  * also attempts to forward the request to the controller.
1923  * This function requires the caller holds hci_req_sync_lock.
1924  */
1925 int hci_add_adv_monitor(struct hci_dev *hdev, struct adv_monitor *monitor)
1926 {
1927         int min, max, handle;
1928         int status = 0;
1929
1930         if (!monitor)
1931                 return -EINVAL;
1932
1933         hci_dev_lock(hdev);
1934
1935         min = HCI_MIN_ADV_MONITOR_HANDLE;
1936         max = HCI_MIN_ADV_MONITOR_HANDLE + HCI_MAX_ADV_MONITOR_NUM_HANDLES;
1937         handle = idr_alloc(&hdev->adv_monitors_idr, monitor, min, max,
1938                            GFP_KERNEL);
1939
1940         hci_dev_unlock(hdev);
1941
1942         if (handle < 0)
1943                 return handle;
1944
1945         monitor->handle = handle;
1946
1947         if (!hdev_is_powered(hdev))
1948                 return status;
1949
1950         switch (hci_get_adv_monitor_offload_ext(hdev)) {
1951         case HCI_ADV_MONITOR_EXT_NONE:
1952                 bt_dev_dbg(hdev, "%s add monitor %d status %d", hdev->name,
1953                            monitor->handle, status);
1954                 /* Message was not forwarded to controller - not an error */
1955                 break;
1956
1957         case HCI_ADV_MONITOR_EXT_MSFT:
1958                 status = msft_add_monitor_pattern(hdev, monitor);
1959                 bt_dev_dbg(hdev, "%s add monitor %d msft status %d", hdev->name,
1960                            monitor->handle, status);
1961                 break;
1962         }
1963
1964         return status;
1965 }
1966
1967 /* Attempts to tell the controller and free the monitor. If somehow the
1968  * controller doesn't have a corresponding handle, remove anyway.
1969  * This function requires the caller holds hci_req_sync_lock.
1970  */
1971 static int hci_remove_adv_monitor(struct hci_dev *hdev,
1972                                   struct adv_monitor *monitor)
1973 {
1974         int status = 0;
1975
1976         switch (hci_get_adv_monitor_offload_ext(hdev)) {
1977         case HCI_ADV_MONITOR_EXT_NONE: /* also goes here when powered off */
1978                 bt_dev_dbg(hdev, "%s remove monitor %d status %d", hdev->name,
1979                            monitor->handle, status);
1980                 goto free_monitor;
1981
1982         case HCI_ADV_MONITOR_EXT_MSFT:
1983                 status = msft_remove_monitor(hdev, monitor);
1984                 bt_dev_dbg(hdev, "%s remove monitor %d msft status %d",
1985                            hdev->name, monitor->handle, status);
1986                 break;
1987         }
1988
1989         /* In case no matching handle registered, just free the monitor */
1990         if (status == -ENOENT)
1991                 goto free_monitor;
1992
1993         return status;
1994
1995 free_monitor:
1996         if (status == -ENOENT)
1997                 bt_dev_warn(hdev, "Removing monitor with no matching handle %d",
1998                             monitor->handle);
1999         hci_free_adv_monitor(hdev, monitor);
2000
2001         return status;
2002 }
2003
2004 /* This function requires the caller holds hci_req_sync_lock */
2005 int hci_remove_single_adv_monitor(struct hci_dev *hdev, u16 handle)
2006 {
2007         struct adv_monitor *monitor = idr_find(&hdev->adv_monitors_idr, handle);
2008
2009         if (!monitor)
2010                 return -EINVAL;
2011
2012         return hci_remove_adv_monitor(hdev, monitor);
2013 }
2014
2015 /* This function requires the caller holds hci_req_sync_lock */
2016 int hci_remove_all_adv_monitor(struct hci_dev *hdev)
2017 {
2018         struct adv_monitor *monitor;
2019         int idr_next_id = 0;
2020         int status = 0;
2021
2022         while (1) {
2023                 monitor = idr_get_next(&hdev->adv_monitors_idr, &idr_next_id);
2024                 if (!monitor)
2025                         break;
2026
2027                 status = hci_remove_adv_monitor(hdev, monitor);
2028                 if (status)
2029                         return status;
2030
2031                 idr_next_id++;
2032         }
2033
2034         return status;
2035 }
2036
2037 /* This function requires the caller holds hdev->lock */
2038 bool hci_is_adv_monitoring(struct hci_dev *hdev)
2039 {
2040         return !idr_is_empty(&hdev->adv_monitors_idr);
2041 }
2042
2043 int hci_get_adv_monitor_offload_ext(struct hci_dev *hdev)
2044 {
2045         if (msft_monitor_supported(hdev))
2046                 return HCI_ADV_MONITOR_EXT_MSFT;
2047
2048         return HCI_ADV_MONITOR_EXT_NONE;
2049 }
2050
2051 struct bdaddr_list *hci_bdaddr_list_lookup(struct list_head *bdaddr_list,
2052                                          bdaddr_t *bdaddr, u8 type)
2053 {
2054         struct bdaddr_list *b;
2055
2056         list_for_each_entry(b, bdaddr_list, list) {
2057                 if (!bacmp(&b->bdaddr, bdaddr) && b->bdaddr_type == type)
2058                         return b;
2059         }
2060
2061         return NULL;
2062 }
2063
2064 struct bdaddr_list_with_irk *hci_bdaddr_list_lookup_with_irk(
2065                                 struct list_head *bdaddr_list, bdaddr_t *bdaddr,
2066                                 u8 type)
2067 {
2068         struct bdaddr_list_with_irk *b;
2069
2070         list_for_each_entry(b, bdaddr_list, list) {
2071                 if (!bacmp(&b->bdaddr, bdaddr) && b->bdaddr_type == type)
2072                         return b;
2073         }
2074
2075         return NULL;
2076 }
2077
2078 struct bdaddr_list_with_flags *
2079 hci_bdaddr_list_lookup_with_flags(struct list_head *bdaddr_list,
2080                                   bdaddr_t *bdaddr, u8 type)
2081 {
2082         struct bdaddr_list_with_flags *b;
2083
2084         list_for_each_entry(b, bdaddr_list, list) {
2085                 if (!bacmp(&b->bdaddr, bdaddr) && b->bdaddr_type == type)
2086                         return b;
2087         }
2088
2089         return NULL;
2090 }
2091
2092 void hci_bdaddr_list_clear(struct list_head *bdaddr_list)
2093 {
2094         struct bdaddr_list *b, *n;
2095
2096         list_for_each_entry_safe(b, n, bdaddr_list, list) {
2097                 list_del(&b->list);
2098                 kfree(b);
2099         }
2100 }
2101
2102 int hci_bdaddr_list_add(struct list_head *list, bdaddr_t *bdaddr, u8 type)
2103 {
2104         struct bdaddr_list *entry;
2105
2106         if (!bacmp(bdaddr, BDADDR_ANY))
2107                 return -EBADF;
2108
2109         if (hci_bdaddr_list_lookup(list, bdaddr, type))
2110                 return -EEXIST;
2111
2112         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
2113         if (!entry)
2114                 return -ENOMEM;
2115
2116         bacpy(&entry->bdaddr, bdaddr);
2117         entry->bdaddr_type = type;
2118
2119         list_add(&entry->list, list);
2120
2121         return 0;
2122 }
2123
2124 int hci_bdaddr_list_add_with_irk(struct list_head *list, bdaddr_t *bdaddr,
2125                                         u8 type, u8 *peer_irk, u8 *local_irk)
2126 {
2127         struct bdaddr_list_with_irk *entry;
2128
2129         if (!bacmp(bdaddr, BDADDR_ANY))
2130                 return -EBADF;
2131
2132         if (hci_bdaddr_list_lookup(list, bdaddr, type))
2133                 return -EEXIST;
2134
2135         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
2136         if (!entry)
2137                 return -ENOMEM;
2138
2139         bacpy(&entry->bdaddr, bdaddr);
2140         entry->bdaddr_type = type;
2141
2142         if (peer_irk)
2143                 memcpy(entry->peer_irk, peer_irk, 16);
2144
2145         if (local_irk)
2146                 memcpy(entry->local_irk, local_irk, 16);
2147
2148         list_add(&entry->list, list);
2149
2150         return 0;
2151 }
2152
2153 int hci_bdaddr_list_add_with_flags(struct list_head *list, bdaddr_t *bdaddr,
2154                                    u8 type, u32 flags)
2155 {
2156         struct bdaddr_list_with_flags *entry;
2157
2158         if (!bacmp(bdaddr, BDADDR_ANY))
2159                 return -EBADF;
2160
2161         if (hci_bdaddr_list_lookup(list, bdaddr, type))
2162                 return -EEXIST;
2163
2164         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
2165         if (!entry)
2166                 return -ENOMEM;
2167
2168         bacpy(&entry->bdaddr, bdaddr);
2169         entry->bdaddr_type = type;
2170         entry->flags = flags;
2171
2172         list_add(&entry->list, list);
2173
2174         return 0;
2175 }
2176
2177 int hci_bdaddr_list_del(struct list_head *list, bdaddr_t *bdaddr, u8 type)
2178 {
2179         struct bdaddr_list *entry;
2180
2181         if (!bacmp(bdaddr, BDADDR_ANY)) {
2182                 hci_bdaddr_list_clear(list);
2183                 return 0;
2184         }
2185
2186         entry = hci_bdaddr_list_lookup(list, bdaddr, type);
2187         if (!entry)
2188                 return -ENOENT;
2189
2190         list_del(&entry->list);
2191         kfree(entry);
2192
2193         return 0;
2194 }
2195
2196 int hci_bdaddr_list_del_with_irk(struct list_head *list, bdaddr_t *bdaddr,
2197                                                         u8 type)
2198 {
2199         struct bdaddr_list_with_irk *entry;
2200
2201         if (!bacmp(bdaddr, BDADDR_ANY)) {
2202                 hci_bdaddr_list_clear(list);
2203                 return 0;
2204         }
2205
2206         entry = hci_bdaddr_list_lookup_with_irk(list, bdaddr, type);
2207         if (!entry)
2208                 return -ENOENT;
2209
2210         list_del(&entry->list);
2211         kfree(entry);
2212
2213         return 0;
2214 }
2215
2216 int hci_bdaddr_list_del_with_flags(struct list_head *list, bdaddr_t *bdaddr,
2217                                    u8 type)
2218 {
2219         struct bdaddr_list_with_flags *entry;
2220
2221         if (!bacmp(bdaddr, BDADDR_ANY)) {
2222                 hci_bdaddr_list_clear(list);
2223                 return 0;
2224         }
2225
2226         entry = hci_bdaddr_list_lookup_with_flags(list, bdaddr, type);
2227         if (!entry)
2228                 return -ENOENT;
2229
2230         list_del(&entry->list);
2231         kfree(entry);
2232
2233         return 0;
2234 }
2235
2236 /* This function requires the caller holds hdev->lock */
2237 struct hci_conn_params *hci_conn_params_lookup(struct hci_dev *hdev,
2238                                                bdaddr_t *addr, u8 addr_type)
2239 {
2240         struct hci_conn_params *params;
2241
2242         list_for_each_entry(params, &hdev->le_conn_params, list) {
2243                 if (bacmp(&params->addr, addr) == 0 &&
2244                     params->addr_type == addr_type) {
2245                         return params;
2246                 }
2247         }
2248
2249         return NULL;
2250 }
2251
2252 /* This function requires the caller holds hdev->lock */
2253 struct hci_conn_params *hci_pend_le_action_lookup(struct list_head *list,
2254                                                   bdaddr_t *addr, u8 addr_type)
2255 {
2256         struct hci_conn_params *param;
2257
2258         list_for_each_entry(param, list, action) {
2259                 if (bacmp(&param->addr, addr) == 0 &&
2260                     param->addr_type == addr_type)
2261                         return param;
2262         }
2263
2264         return NULL;
2265 }
2266
2267 /* This function requires the caller holds hdev->lock */
2268 struct hci_conn_params *hci_conn_params_add(struct hci_dev *hdev,
2269                                             bdaddr_t *addr, u8 addr_type)
2270 {
2271         struct hci_conn_params *params;
2272
2273         params = hci_conn_params_lookup(hdev, addr, addr_type);
2274         if (params)
2275                 return params;
2276
2277         params = kzalloc(sizeof(*params), GFP_KERNEL);
2278         if (!params) {
2279                 bt_dev_err(hdev, "out of memory");
2280                 return NULL;
2281         }
2282
2283         bacpy(&params->addr, addr);
2284         params->addr_type = addr_type;
2285
2286         list_add(&params->list, &hdev->le_conn_params);
2287         INIT_LIST_HEAD(&params->action);
2288
2289         params->conn_min_interval = hdev->le_conn_min_interval;
2290         params->conn_max_interval = hdev->le_conn_max_interval;
2291         params->conn_latency = hdev->le_conn_latency;
2292         params->supervision_timeout = hdev->le_supv_timeout;
2293         params->auto_connect = HCI_AUTO_CONN_DISABLED;
2294
2295         BT_DBG("addr %pMR (type %u)", addr, addr_type);
2296
2297         return params;
2298 }
2299
2300 static void hci_conn_params_free(struct hci_conn_params *params)
2301 {
2302         if (params->conn) {
2303                 hci_conn_drop(params->conn);
2304                 hci_conn_put(params->conn);
2305         }
2306
2307         list_del(&params->action);
2308         list_del(&params->list);
2309         kfree(params);
2310 }
2311
2312 /* This function requires the caller holds hdev->lock */
2313 void hci_conn_params_del(struct hci_dev *hdev, bdaddr_t *addr, u8 addr_type)
2314 {
2315         struct hci_conn_params *params;
2316
2317         params = hci_conn_params_lookup(hdev, addr, addr_type);
2318         if (!params)
2319                 return;
2320
2321         hci_conn_params_free(params);
2322
2323         hci_update_passive_scan(hdev);
2324
2325         BT_DBG("addr %pMR (type %u)", addr, addr_type);
2326 }
2327
2328 /* This function requires the caller holds hdev->lock */
2329 void hci_conn_params_clear_disabled(struct hci_dev *hdev)
2330 {
2331         struct hci_conn_params *params, *tmp;
2332
2333         list_for_each_entry_safe(params, tmp, &hdev->le_conn_params, list) {
2334                 if (params->auto_connect != HCI_AUTO_CONN_DISABLED)
2335                         continue;
2336
2337                 /* If trying to establish one time connection to disabled
2338                  * device, leave the params, but mark them as just once.
2339                  */
2340                 if (params->explicit_connect) {
2341                         params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
2342                         continue;
2343                 }
2344
2345                 list_del(&params->list);
2346                 kfree(params);
2347         }
2348
2349         BT_DBG("All LE disabled connection parameters were removed");
2350 }
2351
2352 /* This function requires the caller holds hdev->lock */
2353 static void hci_conn_params_clear_all(struct hci_dev *hdev)
2354 {
2355         struct hci_conn_params *params, *tmp;
2356
2357         list_for_each_entry_safe(params, tmp, &hdev->le_conn_params, list)
2358                 hci_conn_params_free(params);
2359
2360         BT_DBG("All LE connection parameters were removed");
2361 }
2362
2363 /* Copy the Identity Address of the controller.
2364  *
2365  * If the controller has a public BD_ADDR, then by default use that one.
2366  * If this is a LE only controller without a public address, default to
2367  * the static random address.
2368  *
2369  * For debugging purposes it is possible to force controllers with a
2370  * public address to use the static random address instead.
2371  *
2372  * In case BR/EDR has been disabled on a dual-mode controller and
2373  * userspace has configured a static address, then that address
2374  * becomes the identity address instead of the public BR/EDR address.
2375  */
2376 void hci_copy_identity_address(struct hci_dev *hdev, bdaddr_t *bdaddr,
2377                                u8 *bdaddr_type)
2378 {
2379         if (hci_dev_test_flag(hdev, HCI_FORCE_STATIC_ADDR) ||
2380             !bacmp(&hdev->bdaddr, BDADDR_ANY) ||
2381             (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED) &&
2382              bacmp(&hdev->static_addr, BDADDR_ANY))) {
2383                 bacpy(bdaddr, &hdev->static_addr);
2384                 *bdaddr_type = ADDR_LE_DEV_RANDOM;
2385         } else {
2386                 bacpy(bdaddr, &hdev->bdaddr);
2387                 *bdaddr_type = ADDR_LE_DEV_PUBLIC;
2388         }
2389 }
2390
2391 static void hci_clear_wake_reason(struct hci_dev *hdev)
2392 {
2393         hci_dev_lock(hdev);
2394
2395         hdev->wake_reason = 0;
2396         bacpy(&hdev->wake_addr, BDADDR_ANY);
2397         hdev->wake_addr_type = 0;
2398
2399         hci_dev_unlock(hdev);
2400 }
2401
2402 static int hci_suspend_notifier(struct notifier_block *nb, unsigned long action,
2403                                 void *data)
2404 {
2405         struct hci_dev *hdev =
2406                 container_of(nb, struct hci_dev, suspend_notifier);
2407         int ret = 0;
2408
2409         /* Userspace has full control of this device. Do nothing. */
2410         if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
2411                 return NOTIFY_DONE;
2412
2413         if (action == PM_SUSPEND_PREPARE)
2414                 ret = hci_suspend_dev(hdev);
2415         else if (action == PM_POST_SUSPEND)
2416                 ret = hci_resume_dev(hdev);
2417
2418         if (ret)
2419                 bt_dev_err(hdev, "Suspend notifier action (%lu) failed: %d",
2420                            action, ret);
2421
2422         return NOTIFY_DONE;
2423 }
2424
2425 /* Alloc HCI device */
2426 struct hci_dev *hci_alloc_dev_priv(int sizeof_priv)
2427 {
2428         struct hci_dev *hdev;
2429         unsigned int alloc_size;
2430
2431         alloc_size = sizeof(*hdev);
2432         if (sizeof_priv) {
2433                 /* Fixme: May need ALIGN-ment? */
2434                 alloc_size += sizeof_priv;
2435         }
2436
2437         hdev = kzalloc(alloc_size, GFP_KERNEL);
2438         if (!hdev)
2439                 return NULL;
2440
2441         hdev->pkt_type  = (HCI_DM1 | HCI_DH1 | HCI_HV1);
2442         hdev->esco_type = (ESCO_HV1);
2443         hdev->link_mode = (HCI_LM_ACCEPT);
2444         hdev->num_iac = 0x01;           /* One IAC support is mandatory */
2445         hdev->io_capability = 0x03;     /* No Input No Output */
2446         hdev->manufacturer = 0xffff;    /* Default to internal use */
2447         hdev->inq_tx_power = HCI_TX_POWER_INVALID;
2448         hdev->adv_tx_power = HCI_TX_POWER_INVALID;
2449         hdev->adv_instance_cnt = 0;
2450         hdev->cur_adv_instance = 0x00;
2451         hdev->adv_instance_timeout = 0;
2452
2453         hdev->advmon_allowlist_duration = 300;
2454         hdev->advmon_no_filter_duration = 500;
2455         hdev->enable_advmon_interleave_scan = 0x00;     /* Default to disable */
2456
2457         hdev->sniff_max_interval = 800;
2458         hdev->sniff_min_interval = 80;
2459
2460         hdev->le_adv_channel_map = 0x07;
2461         hdev->le_adv_min_interval = 0x0800;
2462         hdev->le_adv_max_interval = 0x0800;
2463         hdev->le_scan_interval = 0x0060;
2464         hdev->le_scan_window = 0x0030;
2465         hdev->le_scan_int_suspend = 0x0400;
2466         hdev->le_scan_window_suspend = 0x0012;
2467         hdev->le_scan_int_discovery = DISCOV_LE_SCAN_INT;
2468         hdev->le_scan_window_discovery = DISCOV_LE_SCAN_WIN;
2469         hdev->le_scan_int_adv_monitor = 0x0060;
2470         hdev->le_scan_window_adv_monitor = 0x0030;
2471         hdev->le_scan_int_connect = 0x0060;
2472         hdev->le_scan_window_connect = 0x0060;
2473         hdev->le_conn_min_interval = 0x0018;
2474         hdev->le_conn_max_interval = 0x0028;
2475         hdev->le_conn_latency = 0x0000;
2476         hdev->le_supv_timeout = 0x002a;
2477         hdev->le_def_tx_len = 0x001b;
2478         hdev->le_def_tx_time = 0x0148;
2479         hdev->le_max_tx_len = 0x001b;
2480         hdev->le_max_tx_time = 0x0148;
2481         hdev->le_max_rx_len = 0x001b;
2482         hdev->le_max_rx_time = 0x0148;
2483         hdev->le_max_key_size = SMP_MAX_ENC_KEY_SIZE;
2484         hdev->le_min_key_size = SMP_MIN_ENC_KEY_SIZE;
2485         hdev->le_tx_def_phys = HCI_LE_SET_PHY_1M;
2486         hdev->le_rx_def_phys = HCI_LE_SET_PHY_1M;
2487         hdev->le_num_of_adv_sets = HCI_MAX_ADV_INSTANCES;
2488         hdev->def_multi_adv_rotation_duration = HCI_DEFAULT_ADV_DURATION;
2489         hdev->def_le_autoconnect_timeout = HCI_LE_AUTOCONN_TIMEOUT;
2490         hdev->min_le_tx_power = HCI_TX_POWER_INVALID;
2491         hdev->max_le_tx_power = HCI_TX_POWER_INVALID;
2492
2493         hdev->rpa_timeout = HCI_DEFAULT_RPA_TIMEOUT;
2494         hdev->discov_interleaved_timeout = DISCOV_INTERLEAVED_TIMEOUT;
2495         hdev->conn_info_min_age = DEFAULT_CONN_INFO_MIN_AGE;
2496         hdev->conn_info_max_age = DEFAULT_CONN_INFO_MAX_AGE;
2497         hdev->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
2498         hdev->min_enc_key_size = HCI_MIN_ENC_KEY_SIZE;
2499
2500         /* default 1.28 sec page scan */
2501         hdev->def_page_scan_type = PAGE_SCAN_TYPE_STANDARD;
2502         hdev->def_page_scan_int = 0x0800;
2503         hdev->def_page_scan_window = 0x0012;
2504
2505         mutex_init(&hdev->lock);
2506         mutex_init(&hdev->req_lock);
2507
2508         INIT_LIST_HEAD(&hdev->mesh_pending);
2509         INIT_LIST_HEAD(&hdev->mgmt_pending);
2510         INIT_LIST_HEAD(&hdev->reject_list);
2511         INIT_LIST_HEAD(&hdev->accept_list);
2512         INIT_LIST_HEAD(&hdev->uuids);
2513         INIT_LIST_HEAD(&hdev->link_keys);
2514         INIT_LIST_HEAD(&hdev->long_term_keys);
2515         INIT_LIST_HEAD(&hdev->identity_resolving_keys);
2516         INIT_LIST_HEAD(&hdev->remote_oob_data);
2517         INIT_LIST_HEAD(&hdev->le_accept_list);
2518         INIT_LIST_HEAD(&hdev->le_resolv_list);
2519         INIT_LIST_HEAD(&hdev->le_conn_params);
2520         INIT_LIST_HEAD(&hdev->pend_le_conns);
2521         INIT_LIST_HEAD(&hdev->pend_le_reports);
2522         INIT_LIST_HEAD(&hdev->conn_hash.list);
2523         INIT_LIST_HEAD(&hdev->adv_instances);
2524         INIT_LIST_HEAD(&hdev->blocked_keys);
2525         INIT_LIST_HEAD(&hdev->monitored_devices);
2526
2527         INIT_LIST_HEAD(&hdev->local_codecs);
2528         INIT_WORK(&hdev->rx_work, hci_rx_work);
2529         INIT_WORK(&hdev->cmd_work, hci_cmd_work);
2530         INIT_WORK(&hdev->tx_work, hci_tx_work);
2531         INIT_WORK(&hdev->power_on, hci_power_on);
2532         INIT_WORK(&hdev->error_reset, hci_error_reset);
2533
2534         hci_cmd_sync_init(hdev);
2535
2536         INIT_DELAYED_WORK(&hdev->power_off, hci_power_off);
2537
2538         skb_queue_head_init(&hdev->rx_q);
2539         skb_queue_head_init(&hdev->cmd_q);
2540         skb_queue_head_init(&hdev->raw_q);
2541
2542         init_waitqueue_head(&hdev->req_wait_q);
2543
2544         INIT_DELAYED_WORK(&hdev->cmd_timer, hci_cmd_timeout);
2545         INIT_DELAYED_WORK(&hdev->ncmd_timer, hci_ncmd_timeout);
2546
2547         hci_devcd_setup(hdev);
2548         hci_request_setup(hdev);
2549
2550         hci_init_sysfs(hdev);
2551         discovery_init(hdev);
2552
2553         return hdev;
2554 }
2555 EXPORT_SYMBOL(hci_alloc_dev_priv);
2556
2557 /* Free HCI device */
2558 void hci_free_dev(struct hci_dev *hdev)
2559 {
2560         /* will free via device release */
2561         put_device(&hdev->dev);
2562 }
2563 EXPORT_SYMBOL(hci_free_dev);
2564
2565 /* Register HCI device */
2566 int hci_register_dev(struct hci_dev *hdev)
2567 {
2568         int id, error;
2569
2570         if (!hdev->open || !hdev->close || !hdev->send)
2571                 return -EINVAL;
2572
2573         /* Do not allow HCI_AMP devices to register at index 0,
2574          * so the index can be used as the AMP controller ID.
2575          */
2576         switch (hdev->dev_type) {
2577         case HCI_PRIMARY:
2578                 id = ida_simple_get(&hci_index_ida, 0, HCI_MAX_ID, GFP_KERNEL);
2579                 break;
2580         case HCI_AMP:
2581                 id = ida_simple_get(&hci_index_ida, 1, HCI_MAX_ID, GFP_KERNEL);
2582                 break;
2583         default:
2584                 return -EINVAL;
2585         }
2586
2587         if (id < 0)
2588                 return id;
2589
2590         snprintf(hdev->name, sizeof(hdev->name), "hci%d", id);
2591         hdev->id = id;
2592
2593         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
2594
2595         hdev->workqueue = alloc_ordered_workqueue("%s", WQ_HIGHPRI, hdev->name);
2596         if (!hdev->workqueue) {
2597                 error = -ENOMEM;
2598                 goto err;
2599         }
2600
2601         hdev->req_workqueue = alloc_ordered_workqueue("%s", WQ_HIGHPRI,
2602                                                       hdev->name);
2603         if (!hdev->req_workqueue) {
2604                 destroy_workqueue(hdev->workqueue);
2605                 error = -ENOMEM;
2606                 goto err;
2607         }
2608
2609         if (!IS_ERR_OR_NULL(bt_debugfs))
2610                 hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
2611
2612         dev_set_name(&hdev->dev, "%s", hdev->name);
2613
2614         error = device_add(&hdev->dev);
2615         if (error < 0)
2616                 goto err_wqueue;
2617
2618         hci_leds_init(hdev);
2619
2620         hdev->rfkill = rfkill_alloc(hdev->name, &hdev->dev,
2621                                     RFKILL_TYPE_BLUETOOTH, &hci_rfkill_ops,
2622                                     hdev);
2623         if (hdev->rfkill) {
2624                 if (rfkill_register(hdev->rfkill) < 0) {
2625                         rfkill_destroy(hdev->rfkill);
2626                         hdev->rfkill = NULL;
2627                 }
2628         }
2629
2630         if (hdev->rfkill && rfkill_blocked(hdev->rfkill))
2631                 hci_dev_set_flag(hdev, HCI_RFKILLED);
2632
2633         hci_dev_set_flag(hdev, HCI_SETUP);
2634         hci_dev_set_flag(hdev, HCI_AUTO_OFF);
2635
2636         if (hdev->dev_type == HCI_PRIMARY) {
2637                 /* Assume BR/EDR support until proven otherwise (such as
2638                  * through reading supported features during init.
2639                  */
2640                 hci_dev_set_flag(hdev, HCI_BREDR_ENABLED);
2641         }
2642
2643         write_lock(&hci_dev_list_lock);
2644         list_add(&hdev->list, &hci_dev_list);
2645         write_unlock(&hci_dev_list_lock);
2646
2647         /* Devices that are marked for raw-only usage are unconfigured
2648          * and should not be included in normal operation.
2649          */
2650         if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
2651                 hci_dev_set_flag(hdev, HCI_UNCONFIGURED);
2652
2653         /* Mark Remote Wakeup connection flag as supported if driver has wakeup
2654          * callback.
2655          */
2656         if (hdev->wakeup)
2657                 hdev->conn_flags |= HCI_CONN_FLAG_REMOTE_WAKEUP;
2658
2659         hci_sock_dev_event(hdev, HCI_DEV_REG);
2660         hci_dev_hold(hdev);
2661
2662         error = hci_register_suspend_notifier(hdev);
2663         if (error)
2664                 BT_WARN("register suspend notifier failed error:%d\n", error);
2665
2666         queue_work(hdev->req_workqueue, &hdev->power_on);
2667
2668         idr_init(&hdev->adv_monitors_idr);
2669         msft_register(hdev);
2670
2671         return id;
2672
2673 err_wqueue:
2674         debugfs_remove_recursive(hdev->debugfs);
2675         destroy_workqueue(hdev->workqueue);
2676         destroy_workqueue(hdev->req_workqueue);
2677 err:
2678         ida_simple_remove(&hci_index_ida, hdev->id);
2679
2680         return error;
2681 }
2682 EXPORT_SYMBOL(hci_register_dev);
2683
2684 /* Unregister HCI device */
2685 void hci_unregister_dev(struct hci_dev *hdev)
2686 {
2687         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
2688
2689         hci_dev_set_flag(hdev, HCI_UNREGISTER);
2690
2691         write_lock(&hci_dev_list_lock);
2692         list_del(&hdev->list);
2693         write_unlock(&hci_dev_list_lock);
2694
2695         cancel_work_sync(&hdev->power_on);
2696
2697         hci_cmd_sync_clear(hdev);
2698
2699         hci_unregister_suspend_notifier(hdev);
2700
2701         msft_unregister(hdev);
2702
2703         hci_dev_do_close(hdev);
2704
2705         if (!test_bit(HCI_INIT, &hdev->flags) &&
2706             !hci_dev_test_flag(hdev, HCI_SETUP) &&
2707             !hci_dev_test_flag(hdev, HCI_CONFIG)) {
2708                 hci_dev_lock(hdev);
2709                 mgmt_index_removed(hdev);
2710                 hci_dev_unlock(hdev);
2711         }
2712
2713         /* mgmt_index_removed should take care of emptying the
2714          * pending list */
2715         BUG_ON(!list_empty(&hdev->mgmt_pending));
2716
2717         hci_sock_dev_event(hdev, HCI_DEV_UNREG);
2718
2719         if (hdev->rfkill) {
2720                 rfkill_unregister(hdev->rfkill);
2721                 rfkill_destroy(hdev->rfkill);
2722         }
2723
2724         device_del(&hdev->dev);
2725         /* Actual cleanup is deferred until hci_release_dev(). */
2726         hci_dev_put(hdev);
2727 }
2728 EXPORT_SYMBOL(hci_unregister_dev);
2729
2730 /* Release HCI device */
2731 void hci_release_dev(struct hci_dev *hdev)
2732 {
2733         debugfs_remove_recursive(hdev->debugfs);
2734         kfree_const(hdev->hw_info);
2735         kfree_const(hdev->fw_info);
2736
2737         destroy_workqueue(hdev->workqueue);
2738         destroy_workqueue(hdev->req_workqueue);
2739
2740         hci_dev_lock(hdev);
2741         hci_bdaddr_list_clear(&hdev->reject_list);
2742         hci_bdaddr_list_clear(&hdev->accept_list);
2743         hci_uuids_clear(hdev);
2744         hci_link_keys_clear(hdev);
2745         hci_smp_ltks_clear(hdev);
2746         hci_smp_irks_clear(hdev);
2747         hci_remote_oob_data_clear(hdev);
2748         hci_adv_instances_clear(hdev);
2749         hci_adv_monitors_clear(hdev);
2750         hci_bdaddr_list_clear(&hdev->le_accept_list);
2751         hci_bdaddr_list_clear(&hdev->le_resolv_list);
2752         hci_conn_params_clear_all(hdev);
2753         hci_discovery_filter_clear(hdev);
2754         hci_blocked_keys_clear(hdev);
2755         hci_dev_unlock(hdev);
2756
2757         ida_simple_remove(&hci_index_ida, hdev->id);
2758         kfree_skb(hdev->sent_cmd);
2759         kfree_skb(hdev->recv_event);
2760         kfree(hdev);
2761 }
2762 EXPORT_SYMBOL(hci_release_dev);
2763
2764 int hci_register_suspend_notifier(struct hci_dev *hdev)
2765 {
2766         int ret = 0;
2767
2768         if (!hdev->suspend_notifier.notifier_call &&
2769             !test_bit(HCI_QUIRK_NO_SUSPEND_NOTIFIER, &hdev->quirks)) {
2770                 hdev->suspend_notifier.notifier_call = hci_suspend_notifier;
2771                 ret = register_pm_notifier(&hdev->suspend_notifier);
2772         }
2773
2774         return ret;
2775 }
2776
2777 int hci_unregister_suspend_notifier(struct hci_dev *hdev)
2778 {
2779         int ret = 0;
2780
2781         if (hdev->suspend_notifier.notifier_call) {
2782                 ret = unregister_pm_notifier(&hdev->suspend_notifier);
2783                 if (!ret)
2784                         hdev->suspend_notifier.notifier_call = NULL;
2785         }
2786
2787         return ret;
2788 }
2789
2790 /* Suspend HCI device */
2791 int hci_suspend_dev(struct hci_dev *hdev)
2792 {
2793         int ret;
2794
2795         bt_dev_dbg(hdev, "");
2796
2797         /* Suspend should only act on when powered. */
2798         if (!hdev_is_powered(hdev) ||
2799             hci_dev_test_flag(hdev, HCI_UNREGISTER))
2800                 return 0;
2801
2802         /* If powering down don't attempt to suspend */
2803         if (mgmt_powering_down(hdev))
2804                 return 0;
2805
2806         /* Cancel potentially blocking sync operation before suspend */
2807         __hci_cmd_sync_cancel(hdev, -EHOSTDOWN);
2808
2809         hci_req_sync_lock(hdev);
2810         ret = hci_suspend_sync(hdev);
2811         hci_req_sync_unlock(hdev);
2812
2813         hci_clear_wake_reason(hdev);
2814         mgmt_suspending(hdev, hdev->suspend_state);
2815
2816         hci_sock_dev_event(hdev, HCI_DEV_SUSPEND);
2817         return ret;
2818 }
2819 EXPORT_SYMBOL(hci_suspend_dev);
2820
2821 /* Resume HCI device */
2822 int hci_resume_dev(struct hci_dev *hdev)
2823 {
2824         int ret;
2825
2826         bt_dev_dbg(hdev, "");
2827
2828         /* Resume should only act on when powered. */
2829         if (!hdev_is_powered(hdev) ||
2830             hci_dev_test_flag(hdev, HCI_UNREGISTER))
2831                 return 0;
2832
2833         /* If powering down don't attempt to resume */
2834         if (mgmt_powering_down(hdev))
2835                 return 0;
2836
2837         hci_req_sync_lock(hdev);
2838         ret = hci_resume_sync(hdev);
2839         hci_req_sync_unlock(hdev);
2840
2841         mgmt_resuming(hdev, hdev->wake_reason, &hdev->wake_addr,
2842                       hdev->wake_addr_type);
2843
2844         hci_sock_dev_event(hdev, HCI_DEV_RESUME);
2845         return ret;
2846 }
2847 EXPORT_SYMBOL(hci_resume_dev);
2848
2849 /* Reset HCI device */
2850 int hci_reset_dev(struct hci_dev *hdev)
2851 {
2852         static const u8 hw_err[] = { HCI_EV_HARDWARE_ERROR, 0x01, 0x00 };
2853         struct sk_buff *skb;
2854
2855         skb = bt_skb_alloc(3, GFP_ATOMIC);
2856         if (!skb)
2857                 return -ENOMEM;
2858
2859         hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
2860         skb_put_data(skb, hw_err, 3);
2861
2862         bt_dev_err(hdev, "Injecting HCI hardware error event");
2863
2864         /* Send Hardware Error to upper stack */
2865         return hci_recv_frame(hdev, skb);
2866 }
2867 EXPORT_SYMBOL(hci_reset_dev);
2868
2869 /* Receive frame from HCI drivers */
2870 int hci_recv_frame(struct hci_dev *hdev, struct sk_buff *skb)
2871 {
2872         if (!hdev || (!test_bit(HCI_UP, &hdev->flags)
2873                       && !test_bit(HCI_INIT, &hdev->flags))) {
2874                 kfree_skb(skb);
2875                 return -ENXIO;
2876         }
2877
2878         switch (hci_skb_pkt_type(skb)) {
2879         case HCI_EVENT_PKT:
2880                 break;
2881         case HCI_ACLDATA_PKT:
2882                 /* Detect if ISO packet has been sent as ACL */
2883                 if (hci_conn_num(hdev, ISO_LINK)) {
2884                         __u16 handle = __le16_to_cpu(hci_acl_hdr(skb)->handle);
2885                         __u8 type;
2886
2887                         type = hci_conn_lookup_type(hdev, hci_handle(handle));
2888                         if (type == ISO_LINK)
2889                                 hci_skb_pkt_type(skb) = HCI_ISODATA_PKT;
2890                 }
2891                 break;
2892         case HCI_SCODATA_PKT:
2893                 break;
2894         case HCI_ISODATA_PKT:
2895                 break;
2896         default:
2897                 kfree_skb(skb);
2898                 return -EINVAL;
2899         }
2900
2901         /* Incoming skb */
2902         bt_cb(skb)->incoming = 1;
2903
2904         /* Time stamp */
2905         __net_timestamp(skb);
2906
2907         skb_queue_tail(&hdev->rx_q, skb);
2908         queue_work(hdev->workqueue, &hdev->rx_work);
2909
2910         return 0;
2911 }
2912 EXPORT_SYMBOL(hci_recv_frame);
2913
2914 /* Receive diagnostic message from HCI drivers */
2915 int hci_recv_diag(struct hci_dev *hdev, struct sk_buff *skb)
2916 {
2917         /* Mark as diagnostic packet */
2918         hci_skb_pkt_type(skb) = HCI_DIAG_PKT;
2919
2920         /* Time stamp */
2921         __net_timestamp(skb);
2922
2923         skb_queue_tail(&hdev->rx_q, skb);
2924         queue_work(hdev->workqueue, &hdev->rx_work);
2925
2926         return 0;
2927 }
2928 EXPORT_SYMBOL(hci_recv_diag);
2929
2930 void hci_set_hw_info(struct hci_dev *hdev, const char *fmt, ...)
2931 {
2932         va_list vargs;
2933
2934         va_start(vargs, fmt);
2935         kfree_const(hdev->hw_info);
2936         hdev->hw_info = kvasprintf_const(GFP_KERNEL, fmt, vargs);
2937         va_end(vargs);
2938 }
2939 EXPORT_SYMBOL(hci_set_hw_info);
2940
2941 void hci_set_fw_info(struct hci_dev *hdev, const char *fmt, ...)
2942 {
2943         va_list vargs;
2944
2945         va_start(vargs, fmt);
2946         kfree_const(hdev->fw_info);
2947         hdev->fw_info = kvasprintf_const(GFP_KERNEL, fmt, vargs);
2948         va_end(vargs);
2949 }
2950 EXPORT_SYMBOL(hci_set_fw_info);
2951
2952 /* ---- Interface to upper protocols ---- */
2953
2954 int hci_register_cb(struct hci_cb *cb)
2955 {
2956         BT_DBG("%p name %s", cb, cb->name);
2957
2958         mutex_lock(&hci_cb_list_lock);
2959         list_add_tail(&cb->list, &hci_cb_list);
2960         mutex_unlock(&hci_cb_list_lock);
2961
2962         return 0;
2963 }
2964 EXPORT_SYMBOL(hci_register_cb);
2965
2966 int hci_unregister_cb(struct hci_cb *cb)
2967 {
2968         BT_DBG("%p name %s", cb, cb->name);
2969
2970         mutex_lock(&hci_cb_list_lock);
2971         list_del(&cb->list);
2972         mutex_unlock(&hci_cb_list_lock);
2973
2974         return 0;
2975 }
2976 EXPORT_SYMBOL(hci_unregister_cb);
2977
2978 static int hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
2979 {
2980         int err;
2981
2982         BT_DBG("%s type %d len %d", hdev->name, hci_skb_pkt_type(skb),
2983                skb->len);
2984
2985         /* Time stamp */
2986         __net_timestamp(skb);
2987
2988         /* Send copy to monitor */
2989         hci_send_to_monitor(hdev, skb);
2990
2991         if (atomic_read(&hdev->promisc)) {
2992                 /* Send copy to the sockets */
2993                 hci_send_to_sock(hdev, skb);
2994         }
2995
2996         /* Get rid of skb owner, prior to sending to the driver. */
2997         skb_orphan(skb);
2998
2999         if (!test_bit(HCI_RUNNING, &hdev->flags)) {
3000                 kfree_skb(skb);
3001                 return -EINVAL;
3002         }
3003
3004         err = hdev->send(hdev, skb);
3005         if (err < 0) {
3006                 bt_dev_err(hdev, "sending frame failed (%d)", err);
3007                 kfree_skb(skb);
3008                 return err;
3009         }
3010
3011         return 0;
3012 }
3013
3014 /* Send HCI command */
3015 int hci_send_cmd(struct hci_dev *hdev, __u16 opcode, __u32 plen,
3016                  const void *param)
3017 {
3018         struct sk_buff *skb;
3019
3020         BT_DBG("%s opcode 0x%4.4x plen %d", hdev->name, opcode, plen);
3021
3022         skb = hci_prepare_cmd(hdev, opcode, plen, param);
3023         if (!skb) {
3024                 bt_dev_err(hdev, "no memory for command");
3025                 return -ENOMEM;
3026         }
3027
3028         /* Stand-alone HCI commands must be flagged as
3029          * single-command requests.
3030          */
3031         bt_cb(skb)->hci.req_flags |= HCI_REQ_START;
3032
3033         skb_queue_tail(&hdev->cmd_q, skb);
3034         queue_work(hdev->workqueue, &hdev->cmd_work);
3035
3036         return 0;
3037 }
3038
3039 int __hci_cmd_send(struct hci_dev *hdev, u16 opcode, u32 plen,
3040                    const void *param)
3041 {
3042         struct sk_buff *skb;
3043
3044         if (hci_opcode_ogf(opcode) != 0x3f) {
3045                 /* A controller receiving a command shall respond with either
3046                  * a Command Status Event or a Command Complete Event.
3047                  * Therefore, all standard HCI commands must be sent via the
3048                  * standard API, using hci_send_cmd or hci_cmd_sync helpers.
3049                  * Some vendors do not comply with this rule for vendor-specific
3050                  * commands and do not return any event. We want to support
3051                  * unresponded commands for such cases only.
3052                  */
3053                 bt_dev_err(hdev, "unresponded command not supported");
3054                 return -EINVAL;
3055         }
3056
3057         skb = hci_prepare_cmd(hdev, opcode, plen, param);
3058         if (!skb) {
3059                 bt_dev_err(hdev, "no memory for command (opcode 0x%4.4x)",
3060                            opcode);
3061                 return -ENOMEM;
3062         }
3063
3064         hci_send_frame(hdev, skb);
3065
3066         return 0;
3067 }
3068 EXPORT_SYMBOL(__hci_cmd_send);
3069
3070 /* Get data from the previously sent command */
3071 void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 opcode)
3072 {
3073         struct hci_command_hdr *hdr;
3074
3075         if (!hdev->sent_cmd)
3076                 return NULL;
3077
3078         hdr = (void *) hdev->sent_cmd->data;
3079
3080         if (hdr->opcode != cpu_to_le16(opcode))
3081                 return NULL;
3082
3083         BT_DBG("%s opcode 0x%4.4x", hdev->name, opcode);
3084
3085         return hdev->sent_cmd->data + HCI_COMMAND_HDR_SIZE;
3086 }
3087
3088 /* Get data from last received event */
3089 void *hci_recv_event_data(struct hci_dev *hdev, __u8 event)
3090 {
3091         struct hci_event_hdr *hdr;
3092         int offset;
3093
3094         if (!hdev->recv_event)
3095                 return NULL;
3096
3097         hdr = (void *)hdev->recv_event->data;
3098         offset = sizeof(*hdr);
3099
3100         if (hdr->evt != event) {
3101                 /* In case of LE metaevent check the subevent match */
3102                 if (hdr->evt == HCI_EV_LE_META) {
3103                         struct hci_ev_le_meta *ev;
3104
3105                         ev = (void *)hdev->recv_event->data + offset;
3106                         offset += sizeof(*ev);
3107                         if (ev->subevent == event)
3108                                 goto found;
3109                 }
3110                 return NULL;
3111         }
3112
3113 found:
3114         bt_dev_dbg(hdev, "event 0x%2.2x", event);
3115
3116         return hdev->recv_event->data + offset;
3117 }
3118
3119 /* Send ACL data */
3120 static void hci_add_acl_hdr(struct sk_buff *skb, __u16 handle, __u16 flags)
3121 {
3122         struct hci_acl_hdr *hdr;
3123         int len = skb->len;
3124
3125         skb_push(skb, HCI_ACL_HDR_SIZE);
3126         skb_reset_transport_header(skb);
3127         hdr = (struct hci_acl_hdr *)skb_transport_header(skb);
3128         hdr->handle = cpu_to_le16(hci_handle_pack(handle, flags));
3129         hdr->dlen   = cpu_to_le16(len);
3130 }
3131
3132 static void hci_queue_acl(struct hci_chan *chan, struct sk_buff_head *queue,
3133                           struct sk_buff *skb, __u16 flags)
3134 {
3135         struct hci_conn *conn = chan->conn;
3136         struct hci_dev *hdev = conn->hdev;
3137         struct sk_buff *list;
3138
3139         skb->len = skb_headlen(skb);
3140         skb->data_len = 0;
3141
3142         hci_skb_pkt_type(skb) = HCI_ACLDATA_PKT;
3143
3144         switch (hdev->dev_type) {
3145         case HCI_PRIMARY:
3146                 hci_add_acl_hdr(skb, conn->handle, flags);
3147                 break;
3148         case HCI_AMP:
3149                 hci_add_acl_hdr(skb, chan->handle, flags);
3150                 break;
3151         default:
3152                 bt_dev_err(hdev, "unknown dev_type %d", hdev->dev_type);
3153                 return;
3154         }
3155
3156         list = skb_shinfo(skb)->frag_list;
3157         if (!list) {
3158                 /* Non fragmented */
3159                 BT_DBG("%s nonfrag skb %p len %d", hdev->name, skb, skb->len);
3160
3161                 skb_queue_tail(queue, skb);
3162         } else {
3163                 /* Fragmented */
3164                 BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);
3165
3166                 skb_shinfo(skb)->frag_list = NULL;
3167
3168                 /* Queue all fragments atomically. We need to use spin_lock_bh
3169                  * here because of 6LoWPAN links, as there this function is
3170                  * called from softirq and using normal spin lock could cause
3171                  * deadlocks.
3172                  */
3173                 spin_lock_bh(&queue->lock);
3174
3175                 __skb_queue_tail(queue, skb);
3176
3177                 flags &= ~ACL_START;
3178                 flags |= ACL_CONT;
3179                 do {
3180                         skb = list; list = list->next;
3181
3182                         hci_skb_pkt_type(skb) = HCI_ACLDATA_PKT;
3183                         hci_add_acl_hdr(skb, conn->handle, flags);
3184
3185                         BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);
3186
3187                         __skb_queue_tail(queue, skb);
3188                 } while (list);
3189
3190                 spin_unlock_bh(&queue->lock);
3191         }
3192 }
3193
3194 void hci_send_acl(struct hci_chan *chan, struct sk_buff *skb, __u16 flags)
3195 {
3196         struct hci_dev *hdev = chan->conn->hdev;
3197
3198         BT_DBG("%s chan %p flags 0x%4.4x", hdev->name, chan, flags);
3199
3200         hci_queue_acl(chan, &chan->data_q, skb, flags);
3201
3202         queue_work(hdev->workqueue, &hdev->tx_work);
3203 }
3204
3205 /* Send SCO data */
3206 void hci_send_sco(struct hci_conn *conn, struct sk_buff *skb)
3207 {
3208         struct hci_dev *hdev = conn->hdev;
3209         struct hci_sco_hdr hdr;
3210
3211         BT_DBG("%s len %d", hdev->name, skb->len);
3212
3213         hdr.handle = cpu_to_le16(conn->handle);
3214         hdr.dlen   = skb->len;
3215
3216         skb_push(skb, HCI_SCO_HDR_SIZE);
3217         skb_reset_transport_header(skb);
3218         memcpy(skb_transport_header(skb), &hdr, HCI_SCO_HDR_SIZE);
3219
3220         hci_skb_pkt_type(skb) = HCI_SCODATA_PKT;
3221
3222         skb_queue_tail(&conn->data_q, skb);
3223         queue_work(hdev->workqueue, &hdev->tx_work);
3224 }
3225
3226 /* Send ISO data */
3227 static void hci_add_iso_hdr(struct sk_buff *skb, __u16 handle, __u8 flags)
3228 {
3229         struct hci_iso_hdr *hdr;
3230         int len = skb->len;
3231
3232         skb_push(skb, HCI_ISO_HDR_SIZE);
3233         skb_reset_transport_header(skb);
3234         hdr = (struct hci_iso_hdr *)skb_transport_header(skb);
3235         hdr->handle = cpu_to_le16(hci_handle_pack(handle, flags));
3236         hdr->dlen   = cpu_to_le16(len);
3237 }
3238
3239 static void hci_queue_iso(struct hci_conn *conn, struct sk_buff_head *queue,
3240                           struct sk_buff *skb)
3241 {
3242         struct hci_dev *hdev = conn->hdev;
3243         struct sk_buff *list;
3244         __u16 flags;
3245
3246         skb->len = skb_headlen(skb);
3247         skb->data_len = 0;
3248
3249         hci_skb_pkt_type(skb) = HCI_ISODATA_PKT;
3250
3251         list = skb_shinfo(skb)->frag_list;
3252
3253         flags = hci_iso_flags_pack(list ? ISO_START : ISO_SINGLE, 0x00);
3254         hci_add_iso_hdr(skb, conn->handle, flags);
3255
3256         if (!list) {
3257                 /* Non fragmented */
3258                 BT_DBG("%s nonfrag skb %p len %d", hdev->name, skb, skb->len);
3259
3260                 skb_queue_tail(queue, skb);
3261         } else {
3262                 /* Fragmented */
3263                 BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);
3264
3265                 skb_shinfo(skb)->frag_list = NULL;
3266
3267                 __skb_queue_tail(queue, skb);
3268
3269                 do {
3270                         skb = list; list = list->next;
3271
3272                         hci_skb_pkt_type(skb) = HCI_ISODATA_PKT;
3273                         flags = hci_iso_flags_pack(list ? ISO_CONT : ISO_END,
3274                                                    0x00);
3275                         hci_add_iso_hdr(skb, conn->handle, flags);
3276
3277                         BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);
3278
3279                         __skb_queue_tail(queue, skb);
3280                 } while (list);
3281         }
3282 }
3283
3284 void hci_send_iso(struct hci_conn *conn, struct sk_buff *skb)
3285 {
3286         struct hci_dev *hdev = conn->hdev;
3287
3288         BT_DBG("%s len %d", hdev->name, skb->len);
3289
3290         hci_queue_iso(conn, &conn->data_q, skb);
3291
3292         queue_work(hdev->workqueue, &hdev->tx_work);
3293 }
3294
3295 /* ---- HCI TX task (outgoing data) ---- */
3296
3297 /* HCI Connection scheduler */
3298 static inline void hci_quote_sent(struct hci_conn *conn, int num, int *quote)
3299 {
3300         struct hci_dev *hdev;
3301         int cnt, q;
3302
3303         if (!conn) {
3304                 *quote = 0;
3305                 return;
3306         }
3307
3308         hdev = conn->hdev;
3309
3310         switch (conn->type) {
3311         case ACL_LINK:
3312                 cnt = hdev->acl_cnt;
3313                 break;
3314         case AMP_LINK:
3315                 cnt = hdev->block_cnt;
3316                 break;
3317         case SCO_LINK:
3318         case ESCO_LINK:
3319                 cnt = hdev->sco_cnt;
3320                 break;
3321         case LE_LINK:
3322                 cnt = hdev->le_mtu ? hdev->le_cnt : hdev->acl_cnt;
3323                 break;
3324         case ISO_LINK:
3325                 cnt = hdev->iso_mtu ? hdev->iso_cnt :
3326                         hdev->le_mtu ? hdev->le_cnt : hdev->acl_cnt;
3327                 break;
3328         default:
3329                 cnt = 0;
3330                 bt_dev_err(hdev, "unknown link type %d", conn->type);
3331         }
3332
3333         q = cnt / num;
3334         *quote = q ? q : 1;
3335 }
3336
3337 static struct hci_conn *hci_low_sent(struct hci_dev *hdev, __u8 type,
3338                                      int *quote)
3339 {
3340         struct hci_conn_hash *h = &hdev->conn_hash;
3341         struct hci_conn *conn = NULL, *c;
3342         unsigned int num = 0, min = ~0;
3343
3344         /* We don't have to lock device here. Connections are always
3345          * added and removed with TX task disabled. */
3346
3347         rcu_read_lock();
3348
3349         list_for_each_entry_rcu(c, &h->list, list) {
3350                 if (c->type != type || skb_queue_empty(&c->data_q))
3351                         continue;
3352
3353                 if (c->state != BT_CONNECTED && c->state != BT_CONFIG)
3354                         continue;
3355
3356                 num++;
3357
3358                 if (c->sent < min) {
3359                         min  = c->sent;
3360                         conn = c;
3361                 }
3362
3363                 if (hci_conn_num(hdev, type) == num)
3364                         break;
3365         }
3366
3367         rcu_read_unlock();
3368
3369         hci_quote_sent(conn, num, quote);
3370
3371         BT_DBG("conn %p quote %d", conn, *quote);
3372         return conn;
3373 }
3374
3375 static void hci_link_tx_to(struct hci_dev *hdev, __u8 type)
3376 {
3377         struct hci_conn_hash *h = &hdev->conn_hash;
3378         struct hci_conn *c;
3379
3380         bt_dev_err(hdev, "link tx timeout");
3381
3382         rcu_read_lock();
3383
3384         /* Kill stalled connections */
3385         list_for_each_entry_rcu(c, &h->list, list) {
3386                 if (c->type == type && c->sent) {
3387                         bt_dev_err(hdev, "killing stalled connection %pMR",
3388                                    &c->dst);
3389                         hci_disconnect(c, HCI_ERROR_REMOTE_USER_TERM);
3390                 }
3391         }
3392
3393         rcu_read_unlock();
3394 }
3395
3396 static struct hci_chan *hci_chan_sent(struct hci_dev *hdev, __u8 type,
3397                                       int *quote)
3398 {
3399         struct hci_conn_hash *h = &hdev->conn_hash;
3400         struct hci_chan *chan = NULL;
3401         unsigned int num = 0, min = ~0, cur_prio = 0;
3402         struct hci_conn *conn;
3403         int conn_num = 0;
3404
3405         BT_DBG("%s", hdev->name);
3406
3407         rcu_read_lock();
3408
3409         list_for_each_entry_rcu(conn, &h->list, list) {
3410                 struct hci_chan *tmp;
3411
3412                 if (conn->type != type)
3413                         continue;
3414
3415                 if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG)
3416                         continue;
3417
3418                 conn_num++;
3419
3420                 list_for_each_entry_rcu(tmp, &conn->chan_list, list) {
3421                         struct sk_buff *skb;
3422
3423                         if (skb_queue_empty(&tmp->data_q))
3424                                 continue;
3425
3426                         skb = skb_peek(&tmp->data_q);
3427                         if (skb->priority < cur_prio)
3428                                 continue;
3429
3430                         if (skb->priority > cur_prio) {
3431                                 num = 0;
3432                                 min = ~0;
3433                                 cur_prio = skb->priority;
3434                         }
3435
3436                         num++;
3437
3438                         if (conn->sent < min) {
3439                                 min  = conn->sent;
3440                                 chan = tmp;
3441                         }
3442                 }
3443
3444                 if (hci_conn_num(hdev, type) == conn_num)
3445                         break;
3446         }
3447
3448         rcu_read_unlock();
3449
3450         if (!chan)
3451                 return NULL;
3452
3453         hci_quote_sent(chan->conn, num, quote);
3454
3455         BT_DBG("chan %p quote %d", chan, *quote);
3456         return chan;
3457 }
3458
3459 static void hci_prio_recalculate(struct hci_dev *hdev, __u8 type)
3460 {
3461         struct hci_conn_hash *h = &hdev->conn_hash;
3462         struct hci_conn *conn;
3463         int num = 0;
3464
3465         BT_DBG("%s", hdev->name);
3466
3467         rcu_read_lock();
3468
3469         list_for_each_entry_rcu(conn, &h->list, list) {
3470                 struct hci_chan *chan;
3471
3472                 if (conn->type != type)
3473                         continue;
3474
3475                 if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG)
3476                         continue;
3477
3478                 num++;
3479
3480                 list_for_each_entry_rcu(chan, &conn->chan_list, list) {
3481                         struct sk_buff *skb;
3482
3483                         if (chan->sent) {
3484                                 chan->sent = 0;
3485                                 continue;
3486                         }
3487
3488                         if (skb_queue_empty(&chan->data_q))
3489                                 continue;
3490
3491                         skb = skb_peek(&chan->data_q);
3492                         if (skb->priority >= HCI_PRIO_MAX - 1)
3493                                 continue;
3494
3495                         skb->priority = HCI_PRIO_MAX - 1;
3496
3497                         BT_DBG("chan %p skb %p promoted to %d", chan, skb,
3498                                skb->priority);
3499                 }
3500
3501                 if (hci_conn_num(hdev, type) == num)
3502                         break;
3503         }
3504
3505         rcu_read_unlock();
3506
3507 }
3508
3509 static inline int __get_blocks(struct hci_dev *hdev, struct sk_buff *skb)
3510 {
3511         /* Calculate count of blocks used by this packet */
3512         return DIV_ROUND_UP(skb->len - HCI_ACL_HDR_SIZE, hdev->block_len);
3513 }
3514
3515 static void __check_timeout(struct hci_dev *hdev, unsigned int cnt, u8 type)
3516 {
3517         unsigned long last_tx;
3518
3519         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
3520                 return;
3521
3522         switch (type) {
3523         case LE_LINK:
3524                 last_tx = hdev->le_last_tx;
3525                 break;
3526         default:
3527                 last_tx = hdev->acl_last_tx;
3528                 break;
3529         }
3530
3531         /* tx timeout must be longer than maximum link supervision timeout
3532          * (40.9 seconds)
3533          */
3534         if (!cnt && time_after(jiffies, last_tx + HCI_ACL_TX_TIMEOUT))
3535                 hci_link_tx_to(hdev, type);
3536 }
3537
3538 /* Schedule SCO */
3539 static void hci_sched_sco(struct hci_dev *hdev)
3540 {
3541         struct hci_conn *conn;
3542         struct sk_buff *skb;
3543         int quote;
3544
3545         BT_DBG("%s", hdev->name);
3546
3547         if (!hci_conn_num(hdev, SCO_LINK))
3548                 return;
3549
3550         while (hdev->sco_cnt && (conn = hci_low_sent(hdev, SCO_LINK, &quote))) {
3551                 while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
3552                         BT_DBG("skb %p len %d", skb, skb->len);
3553                         hci_send_frame(hdev, skb);
3554
3555                         conn->sent++;
3556                         if (conn->sent == ~0)
3557                                 conn->sent = 0;
3558                 }
3559         }
3560 }
3561
3562 static void hci_sched_esco(struct hci_dev *hdev)
3563 {
3564         struct hci_conn *conn;
3565         struct sk_buff *skb;
3566         int quote;
3567
3568         BT_DBG("%s", hdev->name);
3569
3570         if (!hci_conn_num(hdev, ESCO_LINK))
3571                 return;
3572
3573         while (hdev->sco_cnt && (conn = hci_low_sent(hdev, ESCO_LINK,
3574                                                      &quote))) {
3575                 while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
3576                         BT_DBG("skb %p len %d", skb, skb->len);
3577                         hci_send_frame(hdev, skb);
3578
3579                         conn->sent++;
3580                         if (conn->sent == ~0)
3581                                 conn->sent = 0;
3582                 }
3583         }
3584 }
3585
3586 static void hci_sched_acl_pkt(struct hci_dev *hdev)
3587 {
3588         unsigned int cnt = hdev->acl_cnt;
3589         struct hci_chan *chan;
3590         struct sk_buff *skb;
3591         int quote;
3592
3593         __check_timeout(hdev, cnt, ACL_LINK);
3594
3595         while (hdev->acl_cnt &&
3596                (chan = hci_chan_sent(hdev, ACL_LINK, &quote))) {
3597                 u32 priority = (skb_peek(&chan->data_q))->priority;
3598                 while (quote-- && (skb = skb_peek(&chan->data_q))) {
3599                         BT_DBG("chan %p skb %p len %d priority %u", chan, skb,
3600                                skb->len, skb->priority);
3601
3602                         /* Stop if priority has changed */
3603                         if (skb->priority < priority)
3604                                 break;
3605
3606                         skb = skb_dequeue(&chan->data_q);
3607
3608                         hci_conn_enter_active_mode(chan->conn,
3609                                                    bt_cb(skb)->force_active);
3610
3611                         hci_send_frame(hdev, skb);
3612                         hdev->acl_last_tx = jiffies;
3613
3614                         hdev->acl_cnt--;
3615                         chan->sent++;
3616                         chan->conn->sent++;
3617
3618                         /* Send pending SCO packets right away */
3619                         hci_sched_sco(hdev);
3620                         hci_sched_esco(hdev);
3621                 }
3622         }
3623
3624         if (cnt != hdev->acl_cnt)
3625                 hci_prio_recalculate(hdev, ACL_LINK);
3626 }
3627
3628 static void hci_sched_acl_blk(struct hci_dev *hdev)
3629 {
3630         unsigned int cnt = hdev->block_cnt;
3631         struct hci_chan *chan;
3632         struct sk_buff *skb;
3633         int quote;
3634         u8 type;
3635
3636         BT_DBG("%s", hdev->name);
3637
3638         if (hdev->dev_type == HCI_AMP)
3639                 type = AMP_LINK;
3640         else
3641                 type = ACL_LINK;
3642
3643         __check_timeout(hdev, cnt, type);
3644
3645         while (hdev->block_cnt > 0 &&
3646                (chan = hci_chan_sent(hdev, type, &quote))) {
3647                 u32 priority = (skb_peek(&chan->data_q))->priority;
3648                 while (quote > 0 && (skb = skb_peek(&chan->data_q))) {
3649                         int blocks;
3650
3651                         BT_DBG("chan %p skb %p len %d priority %u", chan, skb,
3652                                skb->len, skb->priority);
3653
3654                         /* Stop if priority has changed */
3655                         if (skb->priority < priority)
3656                                 break;
3657
3658                         skb = skb_dequeue(&chan->data_q);
3659
3660                         blocks = __get_blocks(hdev, skb);
3661                         if (blocks > hdev->block_cnt)
3662                                 return;
3663
3664                         hci_conn_enter_active_mode(chan->conn,
3665                                                    bt_cb(skb)->force_active);
3666
3667                         hci_send_frame(hdev, skb);
3668                         hdev->acl_last_tx = jiffies;
3669
3670                         hdev->block_cnt -= blocks;
3671                         quote -= blocks;
3672
3673                         chan->sent += blocks;
3674                         chan->conn->sent += blocks;
3675                 }
3676         }
3677
3678         if (cnt != hdev->block_cnt)
3679                 hci_prio_recalculate(hdev, type);
3680 }
3681
3682 static void hci_sched_acl(struct hci_dev *hdev)
3683 {
3684         BT_DBG("%s", hdev->name);
3685
3686         /* No ACL link over BR/EDR controller */
3687         if (!hci_conn_num(hdev, ACL_LINK) && hdev->dev_type == HCI_PRIMARY)
3688                 return;
3689
3690         /* No AMP link over AMP controller */
3691         if (!hci_conn_num(hdev, AMP_LINK) && hdev->dev_type == HCI_AMP)
3692                 return;
3693
3694         switch (hdev->flow_ctl_mode) {
3695         case HCI_FLOW_CTL_MODE_PACKET_BASED:
3696                 hci_sched_acl_pkt(hdev);
3697                 break;
3698
3699         case HCI_FLOW_CTL_MODE_BLOCK_BASED:
3700                 hci_sched_acl_blk(hdev);
3701                 break;
3702         }
3703 }
3704
3705 static void hci_sched_le(struct hci_dev *hdev)
3706 {
3707         struct hci_chan *chan;
3708         struct sk_buff *skb;
3709         int quote, cnt, tmp;
3710
3711         BT_DBG("%s", hdev->name);
3712
3713         if (!hci_conn_num(hdev, LE_LINK))
3714                 return;
3715
3716         cnt = hdev->le_pkts ? hdev->le_cnt : hdev->acl_cnt;
3717
3718         __check_timeout(hdev, cnt, LE_LINK);
3719
3720         tmp = cnt;
3721         while (cnt && (chan = hci_chan_sent(hdev, LE_LINK, &quote))) {
3722                 u32 priority = (skb_peek(&chan->data_q))->priority;
3723                 while (quote-- && (skb = skb_peek(&chan->data_q))) {
3724                         BT_DBG("chan %p skb %p len %d priority %u", chan, skb,
3725                                skb->len, skb->priority);
3726
3727                         /* Stop if priority has changed */
3728                         if (skb->priority < priority)
3729                                 break;
3730
3731                         skb = skb_dequeue(&chan->data_q);
3732
3733                         hci_send_frame(hdev, skb);
3734                         hdev->le_last_tx = jiffies;
3735
3736                         cnt--;
3737                         chan->sent++;
3738                         chan->conn->sent++;
3739
3740                         /* Send pending SCO packets right away */
3741                         hci_sched_sco(hdev);
3742                         hci_sched_esco(hdev);
3743                 }
3744         }
3745
3746         if (hdev->le_pkts)
3747                 hdev->le_cnt = cnt;
3748         else
3749                 hdev->acl_cnt = cnt;
3750
3751         if (cnt != tmp)
3752                 hci_prio_recalculate(hdev, LE_LINK);
3753 }
3754
3755 /* Schedule CIS */
3756 static void hci_sched_iso(struct hci_dev *hdev)
3757 {
3758         struct hci_conn *conn;
3759         struct sk_buff *skb;
3760         int quote, *cnt;
3761
3762         BT_DBG("%s", hdev->name);
3763
3764         if (!hci_conn_num(hdev, ISO_LINK))
3765                 return;
3766
3767         cnt = hdev->iso_pkts ? &hdev->iso_cnt :
3768                 hdev->le_pkts ? &hdev->le_cnt : &hdev->acl_cnt;
3769         while (*cnt && (conn = hci_low_sent(hdev, ISO_LINK, &quote))) {
3770                 while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
3771                         BT_DBG("skb %p len %d", skb, skb->len);
3772                         hci_send_frame(hdev, skb);
3773
3774                         conn->sent++;
3775                         if (conn->sent == ~0)
3776                                 conn->sent = 0;
3777                         (*cnt)--;
3778                 }
3779         }
3780 }
3781
3782 static void hci_tx_work(struct work_struct *work)
3783 {
3784         struct hci_dev *hdev = container_of(work, struct hci_dev, tx_work);
3785         struct sk_buff *skb;
3786
3787         BT_DBG("%s acl %d sco %d le %d iso %d", hdev->name, hdev->acl_cnt,
3788                hdev->sco_cnt, hdev->le_cnt, hdev->iso_cnt);
3789
3790         if (!hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
3791                 /* Schedule queues and send stuff to HCI driver */
3792                 hci_sched_sco(hdev);
3793                 hci_sched_esco(hdev);
3794                 hci_sched_iso(hdev);
3795                 hci_sched_acl(hdev);
3796                 hci_sched_le(hdev);
3797         }
3798
3799         /* Send next queued raw (unknown type) packet */
3800         while ((skb = skb_dequeue(&hdev->raw_q)))
3801                 hci_send_frame(hdev, skb);
3802 }
3803
3804 /* ----- HCI RX task (incoming data processing) ----- */
3805
3806 /* ACL data packet */
3807 static void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb)
3808 {
3809         struct hci_acl_hdr *hdr = (void *) skb->data;
3810         struct hci_conn *conn;
3811         __u16 handle, flags;
3812
3813         skb_pull(skb, HCI_ACL_HDR_SIZE);
3814
3815         handle = __le16_to_cpu(hdr->handle);
3816         flags  = hci_flags(handle);
3817         handle = hci_handle(handle);
3818
3819         BT_DBG("%s len %d handle 0x%4.4x flags 0x%4.4x", hdev->name, skb->len,
3820                handle, flags);
3821
3822         hdev->stat.acl_rx++;
3823
3824         hci_dev_lock(hdev);
3825         conn = hci_conn_hash_lookup_handle(hdev, handle);
3826         hci_dev_unlock(hdev);
3827
3828         if (conn) {
3829                 hci_conn_enter_active_mode(conn, BT_POWER_FORCE_ACTIVE_OFF);
3830
3831                 /* Send to upper protocol */
3832                 l2cap_recv_acldata(conn, skb, flags);
3833                 return;
3834         } else {
3835                 bt_dev_err(hdev, "ACL packet for unknown connection handle %d",
3836                            handle);
3837         }
3838
3839         kfree_skb(skb);
3840 }
3841
3842 /* SCO data packet */
3843 static void hci_scodata_packet(struct hci_dev *hdev, struct sk_buff *skb)
3844 {
3845         struct hci_sco_hdr *hdr = (void *) skb->data;
3846         struct hci_conn *conn;
3847         __u16 handle, flags;
3848
3849         skb_pull(skb, HCI_SCO_HDR_SIZE);
3850
3851         handle = __le16_to_cpu(hdr->handle);
3852         flags  = hci_flags(handle);
3853         handle = hci_handle(handle);
3854
3855         BT_DBG("%s len %d handle 0x%4.4x flags 0x%4.4x", hdev->name, skb->len,
3856                handle, flags);
3857
3858         hdev->stat.sco_rx++;
3859
3860         hci_dev_lock(hdev);
3861         conn = hci_conn_hash_lookup_handle(hdev, handle);
3862         hci_dev_unlock(hdev);
3863
3864         if (conn) {
3865                 /* Send to upper protocol */
3866                 bt_cb(skb)->sco.pkt_status = flags & 0x03;
3867                 sco_recv_scodata(conn, skb);
3868                 return;
3869         } else {
3870                 bt_dev_err_ratelimited(hdev, "SCO packet for unknown connection handle %d",
3871                                        handle);
3872         }
3873
3874         kfree_skb(skb);
3875 }
3876
3877 static void hci_isodata_packet(struct hci_dev *hdev, struct sk_buff *skb)
3878 {
3879         struct hci_iso_hdr *hdr;
3880         struct hci_conn *conn;
3881         __u16 handle, flags;
3882
3883         hdr = skb_pull_data(skb, sizeof(*hdr));
3884         if (!hdr) {
3885                 bt_dev_err(hdev, "ISO packet too small");
3886                 goto drop;
3887         }
3888
3889         handle = __le16_to_cpu(hdr->handle);
3890         flags  = hci_flags(handle);
3891         handle = hci_handle(handle);
3892
3893         bt_dev_dbg(hdev, "len %d handle 0x%4.4x flags 0x%4.4x", skb->len,
3894                    handle, flags);
3895
3896         hci_dev_lock(hdev);
3897         conn = hci_conn_hash_lookup_handle(hdev, handle);
3898         hci_dev_unlock(hdev);
3899
3900         if (!conn) {
3901                 bt_dev_err(hdev, "ISO packet for unknown connection handle %d",
3902                            handle);
3903                 goto drop;
3904         }
3905
3906         /* Send to upper protocol */
3907         iso_recv(conn, skb, flags);
3908         return;
3909
3910 drop:
3911         kfree_skb(skb);
3912 }
3913
3914 static bool hci_req_is_complete(struct hci_dev *hdev)
3915 {
3916         struct sk_buff *skb;
3917
3918         skb = skb_peek(&hdev->cmd_q);
3919         if (!skb)
3920                 return true;
3921
3922         return (bt_cb(skb)->hci.req_flags & HCI_REQ_START);
3923 }
3924
3925 static void hci_resend_last(struct hci_dev *hdev)
3926 {
3927         struct hci_command_hdr *sent;
3928         struct sk_buff *skb;
3929         u16 opcode;
3930
3931         if (!hdev->sent_cmd)
3932                 return;
3933
3934         sent = (void *) hdev->sent_cmd->data;
3935         opcode = __le16_to_cpu(sent->opcode);
3936         if (opcode == HCI_OP_RESET)
3937                 return;
3938
3939         skb = skb_clone(hdev->sent_cmd, GFP_KERNEL);
3940         if (!skb)
3941                 return;
3942
3943         skb_queue_head(&hdev->cmd_q, skb);
3944         queue_work(hdev->workqueue, &hdev->cmd_work);
3945 }
3946
3947 void hci_req_cmd_complete(struct hci_dev *hdev, u16 opcode, u8 status,
3948                           hci_req_complete_t *req_complete,
3949                           hci_req_complete_skb_t *req_complete_skb)
3950 {
3951         struct sk_buff *skb;
3952         unsigned long flags;
3953
3954         BT_DBG("opcode 0x%04x status 0x%02x", opcode, status);
3955
3956         /* If the completed command doesn't match the last one that was
3957          * sent we need to do special handling of it.
3958          */
3959         if (!hci_sent_cmd_data(hdev, opcode)) {
3960                 /* Some CSR based controllers generate a spontaneous
3961                  * reset complete event during init and any pending
3962                  * command will never be completed. In such a case we
3963                  * need to resend whatever was the last sent
3964                  * command.
3965                  */
3966                 if (test_bit(HCI_INIT, &hdev->flags) && opcode == HCI_OP_RESET)
3967                         hci_resend_last(hdev);
3968
3969                 return;
3970         }
3971
3972         /* If we reach this point this event matches the last command sent */
3973         hci_dev_clear_flag(hdev, HCI_CMD_PENDING);
3974
3975         /* If the command succeeded and there's still more commands in
3976          * this request the request is not yet complete.
3977          */
3978         if (!status && !hci_req_is_complete(hdev))
3979                 return;
3980
3981         /* If this was the last command in a request the complete
3982          * callback would be found in hdev->sent_cmd instead of the
3983          * command queue (hdev->cmd_q).
3984          */
3985         if (bt_cb(hdev->sent_cmd)->hci.req_flags & HCI_REQ_SKB) {
3986                 *req_complete_skb = bt_cb(hdev->sent_cmd)->hci.req_complete_skb;
3987                 return;
3988         }
3989
3990         if (bt_cb(hdev->sent_cmd)->hci.req_complete) {
3991                 *req_complete = bt_cb(hdev->sent_cmd)->hci.req_complete;
3992                 return;
3993         }
3994
3995         /* Remove all pending commands belonging to this request */
3996         spin_lock_irqsave(&hdev->cmd_q.lock, flags);
3997         while ((skb = __skb_dequeue(&hdev->cmd_q))) {
3998                 if (bt_cb(skb)->hci.req_flags & HCI_REQ_START) {
3999                         __skb_queue_head(&hdev->cmd_q, skb);
4000                         break;
4001                 }
4002
4003                 if (bt_cb(skb)->hci.req_flags & HCI_REQ_SKB)
4004                         *req_complete_skb = bt_cb(skb)->hci.req_complete_skb;
4005                 else
4006                         *req_complete = bt_cb(skb)->hci.req_complete;
4007                 dev_kfree_skb_irq(skb);
4008         }
4009         spin_unlock_irqrestore(&hdev->cmd_q.lock, flags);
4010 }
4011
4012 static void hci_rx_work(struct work_struct *work)
4013 {
4014         struct hci_dev *hdev = container_of(work, struct hci_dev, rx_work);
4015         struct sk_buff *skb;
4016
4017         BT_DBG("%s", hdev->name);
4018
4019         /* The kcov_remote functions used for collecting packet parsing
4020          * coverage information from this background thread and associate
4021          * the coverage with the syscall's thread which originally injected
4022          * the packet. This helps fuzzing the kernel.
4023          */
4024         for (; (skb = skb_dequeue(&hdev->rx_q)); kcov_remote_stop()) {
4025                 kcov_remote_start_common(skb_get_kcov_handle(skb));
4026
4027                 /* Send copy to monitor */
4028                 hci_send_to_monitor(hdev, skb);
4029
4030                 if (atomic_read(&hdev->promisc)) {
4031                         /* Send copy to the sockets */
4032                         hci_send_to_sock(hdev, skb);
4033                 }
4034
4035                 /* If the device has been opened in HCI_USER_CHANNEL,
4036                  * the userspace has exclusive access to device.
4037                  * When device is HCI_INIT, we still need to process
4038                  * the data packets to the driver in order
4039                  * to complete its setup().
4040                  */
4041                 if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
4042                     !test_bit(HCI_INIT, &hdev->flags)) {
4043                         kfree_skb(skb);
4044                         continue;
4045                 }
4046
4047                 if (test_bit(HCI_INIT, &hdev->flags)) {
4048                         /* Don't process data packets in this states. */
4049                         switch (hci_skb_pkt_type(skb)) {
4050                         case HCI_ACLDATA_PKT:
4051                         case HCI_SCODATA_PKT:
4052                         case HCI_ISODATA_PKT:
4053                                 kfree_skb(skb);
4054                                 continue;
4055                         }
4056                 }
4057
4058                 /* Process frame */
4059                 switch (hci_skb_pkt_type(skb)) {
4060                 case HCI_EVENT_PKT:
4061                         BT_DBG("%s Event packet", hdev->name);
4062                         hci_event_packet(hdev, skb);
4063                         break;
4064
4065                 case HCI_ACLDATA_PKT:
4066                         BT_DBG("%s ACL data packet", hdev->name);
4067                         hci_acldata_packet(hdev, skb);
4068                         break;
4069
4070                 case HCI_SCODATA_PKT:
4071                         BT_DBG("%s SCO data packet", hdev->name);
4072                         hci_scodata_packet(hdev, skb);
4073                         break;
4074
4075                 case HCI_ISODATA_PKT:
4076                         BT_DBG("%s ISO data packet", hdev->name);
4077                         hci_isodata_packet(hdev, skb);
4078                         break;
4079
4080                 default:
4081                         kfree_skb(skb);
4082                         break;
4083                 }
4084         }
4085 }
4086
4087 static void hci_cmd_work(struct work_struct *work)
4088 {
4089         struct hci_dev *hdev = container_of(work, struct hci_dev, cmd_work);
4090         struct sk_buff *skb;
4091
4092         BT_DBG("%s cmd_cnt %d cmd queued %d", hdev->name,
4093                atomic_read(&hdev->cmd_cnt), skb_queue_len(&hdev->cmd_q));
4094
4095         /* Send queued commands */
4096         if (atomic_read(&hdev->cmd_cnt)) {
4097                 skb = skb_dequeue(&hdev->cmd_q);
4098                 if (!skb)
4099                         return;
4100
4101                 kfree_skb(hdev->sent_cmd);
4102
4103                 hdev->sent_cmd = skb_clone(skb, GFP_KERNEL);
4104                 if (hdev->sent_cmd) {
4105                         int res;
4106                         if (hci_req_status_pend(hdev))
4107                                 hci_dev_set_flag(hdev, HCI_CMD_PENDING);
4108                         atomic_dec(&hdev->cmd_cnt);
4109
4110                         res = hci_send_frame(hdev, skb);
4111                         if (res < 0)
4112                                 __hci_cmd_sync_cancel(hdev, -res);
4113
4114                         rcu_read_lock();
4115                         if (test_bit(HCI_RESET, &hdev->flags) ||
4116                             hci_dev_test_flag(hdev, HCI_CMD_DRAIN_WORKQUEUE))
4117                                 cancel_delayed_work(&hdev->cmd_timer);
4118                         else
4119                                 queue_delayed_work(hdev->workqueue, &hdev->cmd_timer,
4120                                                    HCI_CMD_TIMEOUT);
4121                         rcu_read_unlock();
4122                 } else {
4123                         skb_queue_head(&hdev->cmd_q, skb);
4124                         queue_work(hdev->workqueue, &hdev->cmd_work);
4125                 }
4126         }
4127 }