net/bluetooth/hci_core.c

   1 /*
   2    BlueZ - Bluetooth protocol stack for Linux
   3    Copyright (C) 2000-2001 Qualcomm Incorporated
   4
   5    Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License version 2 as
   9    published by the Free Software Foundation;
  10
  11    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  12    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  13    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  14    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  15    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  16    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19
  20    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  21    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  22    SOFTWARE IS DISCLAIMED.
  23 */
  24
  25 /* Bluetooth HCI core. */
  26
  27 #include <linux/jiffies.h>
  28 #include <linux/module.h>
  29 #include <linux/kmod.h>
  30
  31 #include <linux/types.h>
  32 #include <linux/errno.h>
  33 #include <linux/kernel.h>
  34 #include <linux/sched.h>
  35 #include <linux/slab.h>
  36 #include <linux/poll.h>
  37 #include <linux/fcntl.h>
  38 #include <linux/init.h>
  39 #include <linux/skbuff.h>
  40 #include <linux/workqueue.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/notifier.h>
  43 #include <linux/rfkill.h>
  44 #include <linux/timer.h>
  45 #include <linux/crypto.h>
  46 #include <net/sock.h>
  47
  48 #include <asm/system.h>
  49 #include <linux/uaccess.h>
  50 #include <asm/unaligned.h>
  51
  52 #include <net/bluetooth/bluetooth.h>
  53 #include <net/bluetooth/hci_core.h>
  54
  55 #define AUTO_OFF_TIMEOUT 2000
  56
  57 static void hci_cmd_task(unsigned long arg);
  58 static void hci_rx_task(unsigned long arg);
  59 static void hci_tx_task(unsigned long arg);
  60
  61 static DEFINE_RWLOCK(hci_task_lock);
  62
  63 /* HCI device list */
  64 LIST_HEAD(hci_dev_list);
  65 DEFINE_RWLOCK(hci_dev_list_lock);
  66
  67 /* HCI callback list */
  68 LIST_HEAD(hci_cb_list);
  69 DEFINE_RWLOCK(hci_cb_list_lock);
  70
  71 /* HCI protocols */
  72 #define HCI_MAX_PROTO   2
  73 struct hci_proto *hci_proto[HCI_MAX_PROTO];
  74
  75 /* HCI notifiers list */
  76 static ATOMIC_NOTIFIER_HEAD(hci_notifier);
  77
  78 /* ---- HCI notifications ---- */
  79
  80 int hci_register_notifier(struct notifier_block *nb)
  81 {
  82         return atomic_notifier_chain_register(&hci_notifier, nb);
  83 }
  84
  85 int hci_unregister_notifier(struct notifier_block *nb)
  86 {
  87         return atomic_notifier_chain_unregister(&hci_notifier, nb);
  88 }
  89
  90 static void hci_notify(struct hci_dev *hdev, int event)
  91 {
  92         atomic_notifier_call_chain(&hci_notifier, event, hdev);
  93 }
  94
  95 /* ---- HCI requests ---- */
  96
  97 void hci_req_complete(struct hci_dev *hdev, __u16 cmd, int result)
  98 {
  99         BT_DBG("%s command 0x%04x result 0x%2.2x", hdev->name, cmd, result);
 100
 101         /* If this is the init phase check if the completed command matches
 102          * the last init command, and if not just return.
 103          */
 104         if (test_bit(HCI_INIT, &hdev->flags) && hdev->init_last_cmd != cmd)
 105                 return;
 106
 107         if (hdev->req_status == HCI_REQ_PEND) {
 108                 hdev->req_result = result;
 109                 hdev->req_status = HCI_REQ_DONE;
 110                 wake_up_interruptible(&hdev->req_wait_q);
 111         }
 112 }
 113
 114 static void hci_req_cancel(struct hci_dev *hdev, int err)
 115 {
 116         BT_DBG("%s err 0x%2.2x", hdev->name, err);
 117
 118         if (hdev->req_status == HCI_REQ_PEND) {
 119                 hdev->req_result = err;
 120                 hdev->req_status = HCI_REQ_CANCELED;
 121                 wake_up_interruptible(&hdev->req_wait_q);
 122         }
 123 }
 124
 125 /* Execute request and wait for completion. */
 126 static int __hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt),
 127                                         unsigned long opt, __u32 timeout)
 128 {
 129         DECLARE_WAITQUEUE(wait, current);
 130         int err = 0;
 131
 132         BT_DBG("%s start", hdev->name);
 133
 134         hdev->req_status = HCI_REQ_PEND;
 135
 136         add_wait_queue(&hdev->req_wait_q, &wait);
 137         set_current_state(TASK_INTERRUPTIBLE);
 138
 139         req(hdev, opt);
 140         schedule_timeout(timeout);
 141
 142         remove_wait_queue(&hdev->req_wait_q, &wait);
 143
 144         if (signal_pending(current))
 145                 return -EINTR;
 146
 147         switch (hdev->req_status) {
 148         case HCI_REQ_DONE:
 149                 err = -bt_to_errno(hdev->req_result);
 150                 break;
 151
 152         case HCI_REQ_CANCELED:
 153                 err = -hdev->req_result;
 154                 break;
 155
 156         default:
 157                 err = -ETIMEDOUT;
 158                 break;
 159         }
 160
 161         hdev->req_status = hdev->req_result = 0;
 162
 163         BT_DBG("%s end: err %d", hdev->name, err);
 164
 165         return err;
 166 }
 167
 168 static inline int hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt),
 169                                         unsigned long opt, __u32 timeout)
 170 {
 171         int ret;
 172
 173         if (!test_bit(HCI_UP, &hdev->flags))
 174                 return -ENETDOWN;
 175
 176         /* Serialize all requests */
 177         hci_req_lock(hdev);
 178         ret = __hci_request(hdev, req, opt, timeout);
 179         hci_req_unlock(hdev);
 180
 181         return ret;
 182 }
 183
 184 static void hci_reset_req(struct hci_dev *hdev, unsigned long opt)
 185 {
 186         BT_DBG("%s %ld", hdev->name, opt);
 187
 188         /* Reset device */
 189         set_bit(HCI_RESET, &hdev->flags);
 190         hci_send_cmd(hdev, HCI_OP_RESET, 0, NULL);
 191 }
 192
 193 static void hci_init_req(struct hci_dev *hdev, unsigned long opt)
 194 {
 195         struct hci_cp_delete_stored_link_key cp;
 196         struct sk_buff *skb;
 197         __le16 param;
 198         __u8 flt_type;
 199
 200         BT_DBG("%s %ld", hdev->name, opt);
 201
 202         /* Driver initialization */
 203
 204         /* Special commands */
 205         while ((skb = skb_dequeue(&hdev->driver_init))) {
 206                 bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
 207                 skb->dev = (void *) hdev;
 208
 209                 skb_queue_tail(&hdev->cmd_q, skb);
 210                 tasklet_schedule(&hdev->cmd_task);
 211         }
 212         skb_queue_purge(&hdev->driver_init);
 213
 214         /* Mandatory initialization */
 215
 216         /* Reset */
 217         if (!test_bit(HCI_QUIRK_NO_RESET, &hdev->quirks)) {
 218                         set_bit(HCI_RESET, &hdev->flags);
 219                         hci_send_cmd(hdev, HCI_OP_RESET, 0, NULL);
 220         }
 221
 222         /* Read Local Supported Features */
 223         hci_send_cmd(hdev, HCI_OP_READ_LOCAL_FEATURES, 0, NULL);
 224
 225         /* Read Local Version */
 226         hci_send_cmd(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL);
 227
 228         /* Read Buffer Size (ACL mtu, max pkt, etc.) */
 229         hci_send_cmd(hdev, HCI_OP_READ_BUFFER_SIZE, 0, NULL);
 230
 231 #if 0
 232         /* Host buffer size */
 233         {
 234                 struct hci_cp_host_buffer_size cp;
 235                 cp.acl_mtu = cpu_to_le16(HCI_MAX_ACL_SIZE);
 236                 cp.sco_mtu = HCI_MAX_SCO_SIZE;
 237                 cp.acl_max_pkt = cpu_to_le16(0xffff);
 238                 cp.sco_max_pkt = cpu_to_le16(0xffff);
 239                 hci_send_cmd(hdev, HCI_OP_HOST_BUFFER_SIZE, sizeof(cp), &cp);
 240         }
 241 #endif
 242
 243         /* Read BD Address */
 244         hci_send_cmd(hdev, HCI_OP_READ_BD_ADDR, 0, NULL);
 245
 246         /* Read Class of Device */
 247         hci_send_cmd(hdev, HCI_OP_READ_CLASS_OF_DEV, 0, NULL);
 248
 249         /* Read Local Name */
 250         hci_send_cmd(hdev, HCI_OP_READ_LOCAL_NAME, 0, NULL);
 251
 252         /* Read Voice Setting */
 253         hci_send_cmd(hdev, HCI_OP_READ_VOICE_SETTING, 0, NULL);
 254
 255         /* Optional initialization */
 256
 257         /* Clear Event Filters */
 258         flt_type = HCI_FLT_CLEAR_ALL;
 259         hci_send_cmd(hdev, HCI_OP_SET_EVENT_FLT, 1, &flt_type);
 260
 261         /* Connection accept timeout ~20 secs */
 262         param = cpu_to_le16(0x7d00);
 263         hci_send_cmd(hdev, HCI_OP_WRITE_CA_TIMEOUT, 2, &param);
 264
 265         bacpy(&cp.bdaddr, BDADDR_ANY);
 266         cp.delete_all = 1;
 267         hci_send_cmd(hdev, HCI_OP_DELETE_STORED_LINK_KEY, sizeof(cp), &cp);
 268 }
 269
 270 static void hci_le_init_req(struct hci_dev *hdev, unsigned long opt)
 271 {
 272         BT_DBG("%s", hdev->name);
 273
 274         /* Read LE buffer size */
 275         hci_send_cmd(hdev, HCI_OP_LE_READ_BUFFER_SIZE, 0, NULL);
 276 }
 277
 278 static void hci_scan_req(struct hci_dev *hdev, unsigned long opt)
 279 {
 280         __u8 scan = opt;
 281
 282         BT_DBG("%s %x", hdev->name, scan);
 283
 284         /* Inquiry and Page scans */
 285         hci_send_cmd(hdev, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
 286 }
 287
 288 static void hci_auth_req(struct hci_dev *hdev, unsigned long opt)
 289 {
 290         __u8 auth = opt;
 291
 292         BT_DBG("%s %x", hdev->name, auth);
 293
 294         /* Authentication */
 295         hci_send_cmd(hdev, HCI_OP_WRITE_AUTH_ENABLE, 1, &auth);
 296 }
 297
 298 static void hci_encrypt_req(struct hci_dev *hdev, unsigned long opt)
 299 {
 300         __u8 encrypt = opt;
 301
 302         BT_DBG("%s %x", hdev->name, encrypt);
 303
 304         /* Encryption */
 305         hci_send_cmd(hdev, HCI_OP_WRITE_ENCRYPT_MODE, 1, &encrypt);
 306 }
 307
 308 static void hci_linkpol_req(struct hci_dev *hdev, unsigned long opt)
 309 {
 310         __le16 policy = cpu_to_le16(opt);
 311
 312         BT_DBG("%s %x", hdev->name, policy);
 313
 314         /* Default link policy */
 315         hci_send_cmd(hdev, HCI_OP_WRITE_DEF_LINK_POLICY, 2, &policy);
 316 }
 317
 318 /* Get HCI device by index.
 319  * Device is held on return. */
 320 struct hci_dev *hci_dev_get(int index)
 321 {
 322         struct hci_dev *hdev = NULL, *d;
 323
 324         BT_DBG("%d", index);
 325
 326         if (index < 0)
 327                 return NULL;
 328
 329         read_lock(&hci_dev_list_lock);
 330         list_for_each_entry(d, &hci_dev_list, list) {
 331                 if (d->id == index) {
 332                         hdev = hci_dev_hold(d);
 333                         break;
 334                 }
 335         }
 336         read_unlock(&hci_dev_list_lock);
 337         return hdev;
 338 }
 339
 340 /* ---- Inquiry support ---- */
 341 static void inquiry_cache_flush(struct hci_dev *hdev)
 342 {
 343         struct inquiry_cache *cache = &hdev->inq_cache;
 344         struct inquiry_entry *next  = cache->list, *e;
 345
 346         BT_DBG("cache %p", cache);
 347
 348         cache->list = NULL;
 349         while ((e = next)) {
 350                 next = e->next;
 351                 kfree(e);
 352         }
 353 }
 354
 355 struct inquiry_entry *hci_inquiry_cache_lookup(struct hci_dev *hdev, bdaddr_t *bdaddr)
 356 {
 357         struct inquiry_cache *cache = &hdev->inq_cache;
 358         struct inquiry_entry *e;
 359
 360         BT_DBG("cache %p, %s", cache, batostr(bdaddr));
 361
 362         for (e = cache->list; e; e = e->next)
 363                 if (!bacmp(&e->data.bdaddr, bdaddr))
 364                         break;
 365         return e;
 366 }
 367
 368 void hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data)
 369 {
 370         struct inquiry_cache *cache = &hdev->inq_cache;
 371         struct inquiry_entry *ie;
 372
 373         BT_DBG("cache %p, %s", cache, batostr(&data->bdaddr));
 374
 375         ie = hci_inquiry_cache_lookup(hdev, &data->bdaddr);
 376         if (!ie) {
 377                 /* Entry not in the cache. Add new one. */
 378                 ie = kzalloc(sizeof(struct inquiry_entry), GFP_ATOMIC);
 379                 if (!ie)
 380                         return;
 381
 382                 ie->next = cache->list;
 383                 cache->list = ie;
 384         }
 385
 386         memcpy(&ie->data, data, sizeof(*data));
 387         ie->timestamp = jiffies;
 388         cache->timestamp = jiffies;
 389 }
 390
 391 static int inquiry_cache_dump(struct hci_dev *hdev, int num, __u8 *buf)
 392 {
 393         struct inquiry_cache *cache = &hdev->inq_cache;
 394         struct inquiry_info *info = (struct inquiry_info *) buf;
 395         struct inquiry_entry *e;
 396         int copied = 0;
 397
 398         for (e = cache->list; e && copied < num; e = e->next, copied++) {
 399                 struct inquiry_data *data = &e->data;
 400                 bacpy(&info->bdaddr, &data->bdaddr);
 401                 info->pscan_rep_mode    = data->pscan_rep_mode;
 402                 info->pscan_period_mode = data->pscan_period_mode;
 403                 info->pscan_mode        = data->pscan_mode;
 404                 memcpy(info->dev_class, data->dev_class, 3);
 405                 info->clock_offset      = data->clock_offset;
 406                 info++;
 407         }
 408
 409         BT_DBG("cache %p, copied %d", cache, copied);
 410         return copied;
 411 }
 412
 413 static void hci_inq_req(struct hci_dev *hdev, unsigned long opt)
 414 {
 415         struct hci_inquiry_req *ir = (struct hci_inquiry_req *) opt;
 416         struct hci_cp_inquiry cp;
 417
 418         BT_DBG("%s", hdev->name);
 419
 420         if (test_bit(HCI_INQUIRY, &hdev->flags))
 421                 return;
 422
 423         /* Start Inquiry */
 424         memcpy(&cp.lap, &ir->lap, 3);
 425         cp.length  = ir->length;
 426         cp.num_rsp = ir->num_rsp;
 427         hci_send_cmd(hdev, HCI_OP_INQUIRY, sizeof(cp), &cp);
 428 }
 429
 430 int hci_inquiry(void __user *arg)
 431 {
 432         __u8 __user *ptr = arg;
 433         struct hci_inquiry_req ir;
 434         struct hci_dev *hdev;
 435         int err = 0, do_inquiry = 0, max_rsp;
 436         long timeo;
 437         __u8 *buf;
 438
 439         if (copy_from_user(&ir, ptr, sizeof(ir)))
 440                 return -EFAULT;
 441
 442         hdev = hci_dev_get(ir.dev_id);
 443         if (!hdev)
 444                 return -ENODEV;
 445
 446         hci_dev_lock_bh(hdev);
 447         if (inquiry_cache_age(hdev) > INQUIRY_CACHE_AGE_MAX ||
 448                                 inquiry_cache_empty(hdev) ||
 449                                 ir.flags & IREQ_CACHE_FLUSH) {
 450                 inquiry_cache_flush(hdev);
 451                 do_inquiry = 1;
 452         }
 453         hci_dev_unlock_bh(hdev);
 454
 455         timeo = ir.length * msecs_to_jiffies(2000);
 456
 457         if (do_inquiry) {
 458                 err = hci_request(hdev, hci_inq_req, (unsigned long)&ir, timeo);
 459                 if (err < 0)
 460                         goto done;
 461         }
 462
 463         /* for unlimited number of responses we will use buffer with 255 entries */
 464         max_rsp = (ir.num_rsp == 0) ? 255 : ir.num_rsp;
 465
 466         /* cache_dump can't sleep. Therefore we allocate temp buffer and then
 467          * copy it to the user space.
 468          */
 469         buf = kmalloc(sizeof(struct inquiry_info) * max_rsp, GFP_KERNEL);
 470         if (!buf) {
 471                 err = -ENOMEM;
 472                 goto done;
 473         }
 474
 475         hci_dev_lock_bh(hdev);
 476         ir.num_rsp = inquiry_cache_dump(hdev, max_rsp, buf);
 477         hci_dev_unlock_bh(hdev);
 478
 479         BT_DBG("num_rsp %d", ir.num_rsp);
 480
 481         if (!copy_to_user(ptr, &ir, sizeof(ir))) {
 482                 ptr += sizeof(ir);
 483                 if (copy_to_user(ptr, buf, sizeof(struct inquiry_info) *
 484                                         ir.num_rsp))
 485                         err = -EFAULT;
 486         } else
 487                 err = -EFAULT;
 488
 489         kfree(buf);
 490
 491 done:
 492         hci_dev_put(hdev);
 493         return err;
 494 }
 495
 496 /* ---- HCI ioctl helpers ---- */
 497
 498 int hci_dev_open(__u16 dev)
 499 {
 500         struct hci_dev *hdev;
 501         int ret = 0;
 502
 503         hdev = hci_dev_get(dev);
 504         if (!hdev)
 505                 return -ENODEV;
 506
 507         BT_DBG("%s %p", hdev->name, hdev);
 508
 509         hci_req_lock(hdev);
 510
 511         if (hdev->rfkill && rfkill_blocked(hdev->rfkill)) {
 512                 ret = -ERFKILL;
 513                 goto done;
 514         }
 515
 516         if (test_bit(HCI_UP, &hdev->flags)) {
 517                 ret = -EALREADY;
 518                 goto done;
 519         }
 520
 521         if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
 522                 set_bit(HCI_RAW, &hdev->flags);
 523
 524         /* Treat all non BR/EDR controllers as raw devices if
 525            enable_hs is not set */
 526         if (hdev->dev_type != HCI_BREDR && !enable_hs)
 527                 set_bit(HCI_RAW, &hdev->flags);
 528
 529         if (hdev->open(hdev)) {
 530                 ret = -EIO;
 531                 goto done;
 532         }
 533
 534         if (!test_bit(HCI_RAW, &hdev->flags)) {
 535                 atomic_set(&hdev->cmd_cnt, 1);
 536                 set_bit(HCI_INIT, &hdev->flags);
 537                 hdev->init_last_cmd = 0;
 538
 539                 ret = __hci_request(hdev, hci_init_req, 0,
 540                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 541
 542                 if (lmp_host_le_capable(hdev))
 543                         ret = __hci_request(hdev, hci_le_init_req, 0,
 544                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 545
 546                 clear_bit(HCI_INIT, &hdev->flags);
 547         }
 548
 549         if (!ret) {
 550                 hci_dev_hold(hdev);
 551                 set_bit(HCI_UP, &hdev->flags);
 552                 hci_notify(hdev, HCI_DEV_UP);
 553                 if (!test_bit(HCI_SETUP, &hdev->flags)) {
 554                         hci_dev_lock_bh(hdev);
 555                         mgmt_powered(hdev, 1);
 556                         hci_dev_unlock_bh(hdev);
 557                 }
 558         } else {
 559                 /* Init failed, cleanup */
 560                 tasklet_kill(&hdev->rx_task);
 561                 tasklet_kill(&hdev->tx_task);
 562                 tasklet_kill(&hdev->cmd_task);
 563
 564                 skb_queue_purge(&hdev->cmd_q);
 565                 skb_queue_purge(&hdev->rx_q);
 566
 567                 if (hdev->flush)
 568                         hdev->flush(hdev);
 569
 570                 if (hdev->sent_cmd) {
 571                         kfree_skb(hdev->sent_cmd);
 572                         hdev->sent_cmd = NULL;
 573                 }
 574
 575                 hdev->close(hdev);
 576                 hdev->flags = 0;
 577         }
 578
 579 done:
 580         hci_req_unlock(hdev);
 581         hci_dev_put(hdev);
 582         return ret;
 583 }
 584
 585 static int hci_dev_do_close(struct hci_dev *hdev)
 586 {
 587         BT_DBG("%s %p", hdev->name, hdev);
 588
 589         hci_req_cancel(hdev, ENODEV);
 590         hci_req_lock(hdev);
 591
 592         if (!test_and_clear_bit(HCI_UP, &hdev->flags)) {
 593                 del_timer_sync(&hdev->cmd_timer);
 594                 hci_req_unlock(hdev);
 595                 return 0;
 596         }
 597
 598         /* Kill RX and TX tasks */
 599         tasklet_kill(&hdev->rx_task);
 600         tasklet_kill(&hdev->tx_task);
 601
 602         if (hdev->discov_timeout > 0) {
 603                 cancel_delayed_work(&hdev->discov_off);
 604                 hdev->discov_timeout = 0;
 605         }
 606
 607         if (test_and_clear_bit(HCI_AUTO_OFF, &hdev->flags))
 608                 cancel_delayed_work(&hdev->power_off);
 609
 610         hci_dev_lock_bh(hdev);
 611         inquiry_cache_flush(hdev);
 612         hci_conn_hash_flush(hdev);
 613         hci_dev_unlock_bh(hdev);
 614
 615         hci_notify(hdev, HCI_DEV_DOWN);
 616
 617         if (hdev->flush)
 618                 hdev->flush(hdev);
 619
 620         /* Reset device */
 621         skb_queue_purge(&hdev->cmd_q);
 622         atomic_set(&hdev->cmd_cnt, 1);
 623         if (!test_bit(HCI_RAW, &hdev->flags)) {
 624                 set_bit(HCI_INIT, &hdev->flags);
 625                 __hci_request(hdev, hci_reset_req, 0,
 626                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 627                 clear_bit(HCI_INIT, &hdev->flags);
 628         }
 629
 630         /* Kill cmd task */
 631         tasklet_kill(&hdev->cmd_task);
 632
 633         /* Drop queues */
 634         skb_queue_purge(&hdev->rx_q);
 635         skb_queue_purge(&hdev->cmd_q);
 636         skb_queue_purge(&hdev->raw_q);
 637
 638         /* Drop last sent command */
 639         if (hdev->sent_cmd) {
 640                 del_timer_sync(&hdev->cmd_timer);
 641                 kfree_skb(hdev->sent_cmd);
 642                 hdev->sent_cmd = NULL;
 643         }
 644
 645         /* After this point our queues are empty
 646          * and no tasks are scheduled. */
 647         hdev->close(hdev);
 648
 649         hci_dev_lock_bh(hdev);
 650         mgmt_powered(hdev, 0);
 651         hci_dev_unlock_bh(hdev);
 652
 653         /* Clear flags */
 654         hdev->flags = 0;
 655
 656         hci_req_unlock(hdev);
 657
 658         hci_dev_put(hdev);
 659         return 0;
 660 }
 661
 662 int hci_dev_close(__u16 dev)
 663 {
 664         struct hci_dev *hdev;
 665         int err;
 666
 667         hdev = hci_dev_get(dev);
 668         if (!hdev)
 669                 return -ENODEV;
 670         err = hci_dev_do_close(hdev);
 671         hci_dev_put(hdev);
 672         return err;
 673 }
 674
 675 int hci_dev_reset(__u16 dev)
 676 {
 677         struct hci_dev *hdev;
 678         int ret = 0;
 679
 680         hdev = hci_dev_get(dev);
 681         if (!hdev)
 682                 return -ENODEV;
 683
 684         hci_req_lock(hdev);
 685         tasklet_disable(&hdev->tx_task);
 686
 687         if (!test_bit(HCI_UP, &hdev->flags))
 688                 goto done;
 689
 690         /* Drop queues */
 691         skb_queue_purge(&hdev->rx_q);
 692         skb_queue_purge(&hdev->cmd_q);
 693
 694         hci_dev_lock_bh(hdev);
 695         inquiry_cache_flush(hdev);
 696         hci_conn_hash_flush(hdev);
 697         hci_dev_unlock_bh(hdev);
 698
 699         if (hdev->flush)
 700                 hdev->flush(hdev);
 701
 702         atomic_set(&hdev->cmd_cnt, 1);
 703         hdev->acl_cnt = 0; hdev->sco_cnt = 0; hdev->le_cnt = 0;
 704
 705         if (!test_bit(HCI_RAW, &hdev->flags))
 706                 ret = __hci_request(hdev, hci_reset_req, 0,
 707                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 708
 709 done:
 710         tasklet_enable(&hdev->tx_task);
 711         hci_req_unlock(hdev);
 712         hci_dev_put(hdev);
 713         return ret;
 714 }
 715
 716 int hci_dev_reset_stat(__u16 dev)
 717 {
 718         struct hci_dev *hdev;
 719         int ret = 0;
 720
 721         hdev = hci_dev_get(dev);
 722         if (!hdev)
 723                 return -ENODEV;
 724
 725         memset(&hdev->stat, 0, sizeof(struct hci_dev_stats));
 726
 727         hci_dev_put(hdev);
 728
 729         return ret;
 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         switch (cmd) {
 746         case HCISETAUTH:
 747                 err = hci_request(hdev, hci_auth_req, dr.dev_opt,
 748                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 749                 break;
 750
 751         case HCISETENCRYPT:
 752                 if (!lmp_encrypt_capable(hdev)) {
 753                         err = -EOPNOTSUPP;
 754                         break;
 755                 }
 756
 757                 if (!test_bit(HCI_AUTH, &hdev->flags)) {
 758                         /* Auth must be enabled first */
 759                         err = hci_request(hdev, hci_auth_req, dr.dev_opt,
 760                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 761                         if (err)
 762                                 break;
 763                 }
 764
 765                 err = hci_request(hdev, hci_encrypt_req, dr.dev_opt,
 766                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 767                 break;
 768
 769         case HCISETSCAN:
 770                 err = hci_request(hdev, hci_scan_req, dr.dev_opt,
 771                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 772                 break;
 773
 774         case HCISETLINKPOL:
 775                 err = hci_request(hdev, hci_linkpol_req, dr.dev_opt,
 776                                         msecs_to_jiffies(HCI_INIT_TIMEOUT));
 777                 break;
 778
 779         case HCISETLINKMODE:
 780                 hdev->link_mode = ((__u16) dr.dev_opt) &
 781                                         (HCI_LM_MASTER | HCI_LM_ACCEPT);
 782                 break;
 783
 784         case HCISETPTYPE:
 785                 hdev->pkt_type = (__u16) dr.dev_opt;
 786                 break;
 787
 788         case HCISETACLMTU:
 789                 hdev->acl_mtu  = *((__u16 *) &dr.dev_opt + 1);
 790                 hdev->acl_pkts = *((__u16 *) &dr.dev_opt + 0);
 791                 break;
 792
 793         case HCISETSCOMTU:
 794                 hdev->sco_mtu  = *((__u16 *) &dr.dev_opt + 1);
 795                 hdev->sco_pkts = *((__u16 *) &dr.dev_opt + 0);
 796                 break;
 797
 798         default:
 799                 err = -EINVAL;
 800                 break;
 801         }
 802
 803         hci_dev_put(hdev);
 804         return err;
 805 }
 806
 807 int hci_get_dev_list(void __user *arg)
 808 {
 809         struct hci_dev *hdev;
 810         struct hci_dev_list_req *dl;
 811         struct hci_dev_req *dr;
 812         int n = 0, size, err;
 813         __u16 dev_num;
 814
 815         if (get_user(dev_num, (__u16 __user *) arg))
 816                 return -EFAULT;
 817
 818         if (!dev_num || dev_num > (PAGE_SIZE * 2) / sizeof(*dr))
 819                 return -EINVAL;
 820
 821         size = sizeof(*dl) + dev_num * sizeof(*dr);
 822
 823         dl = kzalloc(size, GFP_KERNEL);
 824         if (!dl)
 825                 return -ENOMEM;
 826
 827         dr = dl->dev_req;
 828
 829         read_lock_bh(&hci_dev_list_lock);
 830         list_for_each_entry(hdev, &hci_dev_list, list) {
 831                 if (test_and_clear_bit(HCI_AUTO_OFF, &hdev->flags))
 832                         cancel_delayed_work(&hdev->power_off);
 833
 834                 if (!test_bit(HCI_MGMT, &hdev->flags))
 835                         set_bit(HCI_PAIRABLE, &hdev->flags);
 836
 837                 (dr + n)->dev_id  = hdev->id;
 838                 (dr + n)->dev_opt = hdev->flags;
 839
 840                 if (++n >= dev_num)
 841                         break;
 842         }
 843         read_unlock_bh(&hci_dev_list_lock);
 844
 845         dl->dev_num = n;
 846         size = sizeof(*dl) + n * sizeof(*dr);
 847
 848         err = copy_to_user(arg, dl, size);
 849         kfree(dl);
 850
 851         return err ? -EFAULT : 0;
 852 }
 853
 854 int hci_get_dev_info(void __user *arg)
 855 {
 856         struct hci_dev *hdev;
 857         struct hci_dev_info di;
 858         int err = 0;
 859
 860         if (copy_from_user(&di, arg, sizeof(di)))
 861                 return -EFAULT;
 862
 863         hdev = hci_dev_get(di.dev_id);
 864         if (!hdev)
 865                 return -ENODEV;
 866
 867         if (test_and_clear_bit(HCI_AUTO_OFF, &hdev->flags))
 868                 cancel_delayed_work_sync(&hdev->power_off);
 869
 870         if (!test_bit(HCI_MGMT, &hdev->flags))
 871                 set_bit(HCI_PAIRABLE, &hdev->flags);
 872
 873         strcpy(di.name, hdev->name);
 874         di.bdaddr   = hdev->bdaddr;
 875         di.type     = (hdev->bus & 0x0f) | (hdev->dev_type << 4);
 876         di.flags    = hdev->flags;
 877         di.pkt_type = hdev->pkt_type;
 878         di.acl_mtu  = hdev->acl_mtu;
 879         di.acl_pkts = hdev->acl_pkts;
 880         di.sco_mtu  = hdev->sco_mtu;
 881         di.sco_pkts = hdev->sco_pkts;
 882         di.link_policy = hdev->link_policy;
 883         di.link_mode   = hdev->link_mode;
 884
 885         memcpy(&di.stat, &hdev->stat, sizeof(di.stat));
 886         memcpy(&di.features, &hdev->features, sizeof(di.features));
 887
 888         if (copy_to_user(arg, &di, sizeof(di)))
 889                 err = -EFAULT;
 890
 891         hci_dev_put(hdev);
 892
 893         return err;
 894 }
 895
 896 /* ---- Interface to HCI drivers ---- */
 897
 898 static int hci_rfkill_set_block(void *data, bool blocked)
 899 {
 900         struct hci_dev *hdev = data;
 901
 902         BT_DBG("%p name %s blocked %d", hdev, hdev->name, blocked);
 903
 904         if (!blocked)
 905                 return 0;
 906
 907         hci_dev_do_close(hdev);
 908
 909         return 0;
 910 }
 911
 912 static const struct rfkill_ops hci_rfkill_ops = {
 913         .set_block = hci_rfkill_set_block,
 914 };
 915
 916 /* Alloc HCI device */
 917 struct hci_dev *hci_alloc_dev(void)
 918 {
 919         struct hci_dev *hdev;
 920
 921         hdev = kzalloc(sizeof(struct hci_dev), GFP_KERNEL);
 922         if (!hdev)
 923                 return NULL;
 924
 925         hci_init_sysfs(hdev);
 926         skb_queue_head_init(&hdev->driver_init);
 927
 928         return hdev;
 929 }
 930 EXPORT_SYMBOL(hci_alloc_dev);
 931
 932 /* Free HCI device */
 933 void hci_free_dev(struct hci_dev *hdev)
 934 {
 935         skb_queue_purge(&hdev->driver_init);
 936
 937         /* will free via device release */
 938         put_device(&hdev->dev);
 939 }
 940 EXPORT_SYMBOL(hci_free_dev);
 941
 942 static void hci_power_on(struct work_struct *work)
 943 {
 944         struct hci_dev *hdev = container_of(work, struct hci_dev, power_on);
 945
 946         BT_DBG("%s", hdev->name);
 947
 948         if (hci_dev_open(hdev->id) < 0)
 949                 return;
 950
 951         if (test_bit(HCI_AUTO_OFF, &hdev->flags))
 952                 queue_delayed_work(hdev->workqueue, &hdev->power_off,
 953                                         msecs_to_jiffies(AUTO_OFF_TIMEOUT));
 954
 955         if (test_and_clear_bit(HCI_SETUP, &hdev->flags))
 956                 mgmt_index_added(hdev);
 957 }
 958
 959 static void hci_power_off(struct work_struct *work)
 960 {
 961         struct hci_dev *hdev = container_of(work, struct hci_dev,
 962                                                         power_off.work);
 963
 964         BT_DBG("%s", hdev->name);
 965
 966         clear_bit(HCI_AUTO_OFF, &hdev->flags);
 967
 968         hci_dev_close(hdev->id);
 969 }
 970
 971 static void hci_discov_off(struct work_struct *work)
 972 {
 973         struct hci_dev *hdev;
 974         u8 scan = SCAN_PAGE;
 975
 976         hdev = container_of(work, struct hci_dev, discov_off.work);
 977
 978         BT_DBG("%s", hdev->name);
 979
 980         hci_dev_lock_bh(hdev);
 981
 982         hci_send_cmd(hdev, HCI_OP_WRITE_SCAN_ENABLE, sizeof(scan), &scan);
 983
 984         hdev->discov_timeout = 0;
 985
 986         hci_dev_unlock_bh(hdev);
 987 }
 988
 989 int hci_uuids_clear(struct hci_dev *hdev)
 990 {
 991         struct list_head *p, *n;
 992
 993         list_for_each_safe(p, n, &hdev->uuids) {
 994                 struct bt_uuid *uuid;
 995
 996                 uuid = list_entry(p, struct bt_uuid, list);
 997
 998                 list_del(p);
 999                 kfree(uuid);
1000         }
1001
1002         return 0;
1003 }
1004
1005 int hci_link_keys_clear(struct hci_dev *hdev)
1006 {
1007         struct list_head *p, *n;
1008
1009         list_for_each_safe(p, n, &hdev->link_keys) {
1010                 struct link_key *key;
1011
1012                 key = list_entry(p, struct link_key, list);
1013
1014                 list_del(p);
1015                 kfree(key);
1016         }
1017
1018         return 0;
1019 }
1020
1021 struct link_key *hci_find_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)
1022 {
1023         struct link_key *k;
1024
1025         list_for_each_entry(k, &hdev->link_keys, list)
1026                 if (bacmp(bdaddr, &k->bdaddr) == 0)
1027                         return k;
1028
1029         return NULL;
1030 }
1031
1032 static int hci_persistent_key(struct hci_dev *hdev, struct hci_conn *conn,
1033                                                 u8 key_type, u8 old_key_type)
1034 {
1035         /* Legacy key */
1036         if (key_type < 0x03)
1037                 return 1;
1038
1039         /* Debug keys are insecure so don't store them persistently */
1040         if (key_type == HCI_LK_DEBUG_COMBINATION)
1041                 return 0;
1042
1043         /* Changed combination key and there's no previous one */
1044         if (key_type == HCI_LK_CHANGED_COMBINATION && old_key_type == 0xff)
1045                 return 0;
1046
1047         /* Security mode 3 case */
1048         if (!conn)
1049                 return 1;
1050
1051         /* Neither local nor remote side had no-bonding as requirement */
1052         if (conn->auth_type > 0x01 && conn->remote_auth > 0x01)
1053                 return 1;
1054
1055         /* Local side had dedicated bonding as requirement */
1056         if (conn->auth_type == 0x02 || conn->auth_type == 0x03)
1057                 return 1;
1058
1059         /* Remote side had dedicated bonding as requirement */
1060         if (conn->remote_auth == 0x02 || conn->remote_auth == 0x03)
1061                 return 1;
1062
1063         /* If none of the above criteria match, then don't store the key
1064          * persistently */
1065         return 0;
1066 }
1067
1068 struct link_key *hci_find_ltk(struct hci_dev *hdev, __le16 ediv, u8 rand[8])
1069 {
1070         struct link_key *k;
1071
1072         list_for_each_entry(k, &hdev->link_keys, list) {
1073                 struct key_master_id *id;
1074
1075                 if (k->type != HCI_LK_SMP_LTK)
1076                         continue;
1077
1078                 if (k->dlen != sizeof(*id))
1079                         continue;
1080
1081                 id = (void *) &k->data;
1082                 if (id->ediv == ediv &&
1083                                 (memcmp(rand, id->rand, sizeof(id->rand)) == 0))
1084                         return k;
1085         }
1086
1087         return NULL;
1088 }
1089 EXPORT_SYMBOL(hci_find_ltk);
1090
1091 struct link_key *hci_find_link_key_type(struct hci_dev *hdev,
1092                                         bdaddr_t *bdaddr, u8 type)
1093 {
1094         struct link_key *k;
1095
1096         list_for_each_entry(k, &hdev->link_keys, list)
1097                 if (k->type == type && bacmp(bdaddr, &k->bdaddr) == 0)
1098                         return k;
1099
1100         return NULL;
1101 }
1102 EXPORT_SYMBOL(hci_find_link_key_type);
1103
1104 int hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, int new_key,
1105                                 bdaddr_t *bdaddr, u8 *val, u8 type, u8 pin_len)
1106 {
1107         struct link_key *key, *old_key;
1108         u8 old_key_type, persistent;
1109
1110         old_key = hci_find_link_key(hdev, bdaddr);
1111         if (old_key) {
1112                 old_key_type = old_key->type;
1113                 key = old_key;
1114         } else {
1115                 old_key_type = conn ? conn->key_type : 0xff;
1116                 key = kzalloc(sizeof(*key), GFP_ATOMIC);
1117                 if (!key)
1118                         return -ENOMEM;
1119                 list_add(&key->list, &hdev->link_keys);
1120         }
1121
1122         BT_DBG("%s key for %s type %u", hdev->name, batostr(bdaddr), type);
1123
1124         /* Some buggy controller combinations generate a changed
1125          * combination key for legacy pairing even when there's no
1126          * previous key */
1127         if (type == HCI_LK_CHANGED_COMBINATION &&
1128                                         (!conn || conn->remote_auth == 0xff) &&
1129                                         old_key_type == 0xff) {
1130                 type = HCI_LK_COMBINATION;
1131                 if (conn)
1132                         conn->key_type = type;
1133         }
1134
1135         bacpy(&key->bdaddr, bdaddr);
1136         memcpy(key->val, val, 16);
1137         key->pin_len = pin_len;
1138
1139         if (type == HCI_LK_CHANGED_COMBINATION)
1140                 key->type = old_key_type;
1141         else
1142                 key->type = type;
1143
1144         if (!new_key)
1145                 return 0;
1146
1147         persistent = hci_persistent_key(hdev, conn, type, old_key_type);
1148
1149         mgmt_new_link_key(hdev, key, persistent);
1150
1151         if (!persistent) {
1152                 list_del(&key->list);
1153                 kfree(key);
1154         }
1155
1156         return 0;
1157 }
1158
1159 int hci_add_ltk(struct hci_dev *hdev, int new_key, bdaddr_t *bdaddr,
1160                         u8 key_size, __le16 ediv, u8 rand[8], u8 ltk[16])
1161 {
1162         struct link_key *key, *old_key;
1163         struct key_master_id *id;
1164         u8 old_key_type;
1165
1166         BT_DBG("%s addr %s", hdev->name, batostr(bdaddr));
1167
1168         old_key = hci_find_link_key_type(hdev, bdaddr, HCI_LK_SMP_LTK);
1169         if (old_key) {
1170                 key = old_key;
1171                 old_key_type = old_key->type;
1172         } else {
1173                 key = kzalloc(sizeof(*key) + sizeof(*id), GFP_ATOMIC);
1174                 if (!key)
1175                         return -ENOMEM;
1176                 list_add(&key->list, &hdev->link_keys);
1177                 old_key_type = 0xff;
1178         }
1179
1180         key->dlen = sizeof(*id);
1181
1182         bacpy(&key->bdaddr, bdaddr);
1183         memcpy(key->val, ltk, sizeof(key->val));
1184         key->type = HCI_LK_SMP_LTK;
1185         key->pin_len = key_size;
1186
1187         id = (void *) &key->data;
1188         id->ediv = ediv;
1189         memcpy(id->rand, rand, sizeof(id->rand));
1190
1191         if (new_key)
1192                 mgmt_new_link_key(hdev, key, old_key_type);
1193
1194         return 0;
1195 }
1196
1197 int hci_remove_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr)
1198 {
1199         struct link_key *key;
1200
1201         key = hci_find_link_key(hdev, bdaddr);
1202         if (!key)
1203                 return -ENOENT;
1204
1205         BT_DBG("%s removing %s", hdev->name, batostr(bdaddr));
1206
1207         list_del(&key->list);
1208         kfree(key);
1209
1210         return 0;
1211 }
1212
1213 /* HCI command timer function */
1214 static void hci_cmd_timer(unsigned long arg)
1215 {
1216         struct hci_dev *hdev = (void *) arg;
1217
1218         BT_ERR("%s command tx timeout", hdev->name);
1219         atomic_set(&hdev->cmd_cnt, 1);
1220         tasklet_schedule(&hdev->cmd_task);
1221 }
1222
1223 struct oob_data *hci_find_remote_oob_data(struct hci_dev *hdev,
1224                                                         bdaddr_t *bdaddr)
1225 {
1226         struct oob_data *data;
1227
1228         list_for_each_entry(data, &hdev->remote_oob_data, list)
1229                 if (bacmp(bdaddr, &data->bdaddr) == 0)
1230                         return data;
1231
1232         return NULL;
1233 }
1234
1235 int hci_remove_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr)
1236 {
1237         struct oob_data *data;
1238
1239         data = hci_find_remote_oob_data(hdev, bdaddr);
1240         if (!data)
1241                 return -ENOENT;
1242
1243         BT_DBG("%s removing %s", hdev->name, batostr(bdaddr));
1244
1245         list_del(&data->list);
1246         kfree(data);
1247
1248         return 0;
1249 }
1250
1251 int hci_remote_oob_data_clear(struct hci_dev *hdev)
1252 {
1253         struct oob_data *data, *n;
1254
1255         list_for_each_entry_safe(data, n, &hdev->remote_oob_data, list) {
1256                 list_del(&data->list);
1257                 kfree(data);
1258         }
1259
1260         return 0;
1261 }
1262
1263 int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 *hash,
1264                                                                 u8 *randomizer)
1265 {
1266         struct oob_data *data;
1267
1268         data = hci_find_remote_oob_data(hdev, bdaddr);
1269
1270         if (!data) {
1271                 data = kmalloc(sizeof(*data), GFP_ATOMIC);
1272                 if (!data)
1273                         return -ENOMEM;
1274
1275                 bacpy(&data->bdaddr, bdaddr);
1276                 list_add(&data->list, &hdev->remote_oob_data);
1277         }
1278
1279         memcpy(data->hash, hash, sizeof(data->hash));
1280         memcpy(data->randomizer, randomizer, sizeof(data->randomizer));
1281
1282         BT_DBG("%s for %s", hdev->name, batostr(bdaddr));
1283
1284         return 0;
1285 }
1286
1287 struct bdaddr_list *hci_blacklist_lookup(struct hci_dev *hdev,
1288                                                 bdaddr_t *bdaddr)
1289 {
1290         struct bdaddr_list *b;
1291
1292         list_for_each_entry(b, &hdev->blacklist, list)
1293                 if (bacmp(bdaddr, &b->bdaddr) == 0)
1294                         return b;
1295
1296         return NULL;
1297 }
1298
1299 int hci_blacklist_clear(struct hci_dev *hdev)
1300 {
1301         struct list_head *p, *n;
1302
1303         list_for_each_safe(p, n, &hdev->blacklist) {
1304                 struct bdaddr_list *b;
1305
1306                 b = list_entry(p, struct bdaddr_list, list);
1307
1308                 list_del(p);
1309                 kfree(b);
1310         }
1311
1312         return 0;
1313 }
1314
1315 int hci_blacklist_add(struct hci_dev *hdev, bdaddr_t *bdaddr)
1316 {
1317         struct bdaddr_list *entry;
1318
1319         if (bacmp(bdaddr, BDADDR_ANY) == 0)
1320                 return -EBADF;
1321
1322         if (hci_blacklist_lookup(hdev, bdaddr))
1323                 return -EEXIST;
1324
1325         entry = kzalloc(sizeof(struct bdaddr_list), GFP_KERNEL);
1326         if (!entry)
1327                 return -ENOMEM;
1328
1329         bacpy(&entry->bdaddr, bdaddr);
1330
1331         list_add(&entry->list, &hdev->blacklist);
1332
1333         return mgmt_device_blocked(hdev, bdaddr);
1334 }
1335
1336 int hci_blacklist_del(struct hci_dev *hdev, bdaddr_t *bdaddr)
1337 {
1338         struct bdaddr_list *entry;
1339
1340         if (bacmp(bdaddr, BDADDR_ANY) == 0) {
1341                 return hci_blacklist_clear(hdev);
1342         }
1343
1344         entry = hci_blacklist_lookup(hdev, bdaddr);
1345         if (!entry) {
1346                 return -ENOENT;
1347         }
1348
1349         list_del(&entry->list);
1350         kfree(entry);
1351
1352         return mgmt_device_unblocked(hdev, bdaddr);
1353 }
1354
1355 static void hci_clear_adv_cache(unsigned long arg)
1356 {
1357         struct hci_dev *hdev = (void *) arg;
1358
1359         hci_dev_lock(hdev);
1360
1361         hci_adv_entries_clear(hdev);
1362
1363         hci_dev_unlock(hdev);
1364 }
1365
1366 int hci_adv_entries_clear(struct hci_dev *hdev)
1367 {
1368         struct adv_entry *entry, *tmp;
1369
1370         list_for_each_entry_safe(entry, tmp, &hdev->adv_entries, list) {
1371                 list_del(&entry->list);
1372                 kfree(entry);
1373         }
1374
1375         BT_DBG("%s adv cache cleared", hdev->name);
1376
1377         return 0;
1378 }
1379
1380 struct adv_entry *hci_find_adv_entry(struct hci_dev *hdev, bdaddr_t *bdaddr)
1381 {
1382         struct adv_entry *entry;
1383
1384         list_for_each_entry(entry, &hdev->adv_entries, list)
1385                 if (bacmp(bdaddr, &entry->bdaddr) == 0)
1386                         return entry;
1387
1388         return NULL;
1389 }
1390
1391 static inline int is_connectable_adv(u8 evt_type)
1392 {
1393         if (evt_type == ADV_IND || evt_type == ADV_DIRECT_IND)
1394                 return 1;
1395
1396         return 0;
1397 }
1398
1399 int hci_add_adv_entry(struct hci_dev *hdev,
1400                                         struct hci_ev_le_advertising_info *ev)
1401 {
1402         struct adv_entry *entry;
1403
1404         if (!is_connectable_adv(ev->evt_type))
1405                 return -EINVAL;
1406
1407         /* Only new entries should be added to adv_entries. So, if
1408          * bdaddr was found, don't add it. */
1409         if (hci_find_adv_entry(hdev, &ev->bdaddr))
1410                 return 0;
1411
1412         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
1413         if (!entry)
1414                 return -ENOMEM;
1415
1416         bacpy(&entry->bdaddr, &ev->bdaddr);
1417         entry->bdaddr_type = ev->bdaddr_type;
1418
1419         list_add(&entry->list, &hdev->adv_entries);
1420
1421         BT_DBG("%s adv entry added: address %s type %u", hdev->name,
1422                                 batostr(&entry->bdaddr), entry->bdaddr_type);
1423
1424         return 0;
1425 }
1426
1427 /* Register HCI device */
1428 int hci_register_dev(struct hci_dev *hdev)
1429 {
1430         struct list_head *head = &hci_dev_list, *p;
1431         int i, id, error;
1432
1433         BT_DBG("%p name %s bus %d owner %p", hdev, hdev->name,
1434                                                 hdev->bus, hdev->owner);
1435
1436         if (!hdev->open || !hdev->close || !hdev->destruct)
1437                 return -EINVAL;
1438
1439         /* Do not allow HCI_AMP devices to register at index 0,
1440          * so the index can be used as the AMP controller ID.
1441          */
1442         id = (hdev->dev_type == HCI_BREDR) ? 0 : 1;
1443
1444         write_lock_bh(&hci_dev_list_lock);
1445
1446         /* Find first available device id */
1447         list_for_each(p, &hci_dev_list) {
1448                 if (list_entry(p, struct hci_dev, list)->id != id)
1449                         break;
1450                 head = p; id++;
1451         }
1452
1453         sprintf(hdev->name, "hci%d", id);
1454         hdev->id = id;
1455         list_add(&hdev->list, head);
1456
1457         atomic_set(&hdev->refcnt, 1);
1458         spin_lock_init(&hdev->lock);
1459
1460         hdev->flags = 0;
1461         hdev->pkt_type  = (HCI_DM1 | HCI_DH1 | HCI_HV1);
1462         hdev->esco_type = (ESCO_HV1);
1463         hdev->link_mode = (HCI_LM_ACCEPT);
1464         hdev->io_capability = 0x03; /* No Input No Output */
1465
1466         hdev->idle_timeout = 0;
1467         hdev->sniff_max_interval = 800;
1468         hdev->sniff_min_interval = 80;
1469
1470         tasklet_init(&hdev->cmd_task, hci_cmd_task, (unsigned long) hdev);
1471         tasklet_init(&hdev->rx_task, hci_rx_task, (unsigned long) hdev);
1472         tasklet_init(&hdev->tx_task, hci_tx_task, (unsigned long) hdev);
1473
1474         skb_queue_head_init(&hdev->rx_q);
1475         skb_queue_head_init(&hdev->cmd_q);
1476         skb_queue_head_init(&hdev->raw_q);
1477
1478         setup_timer(&hdev->cmd_timer, hci_cmd_timer, (unsigned long) hdev);
1479
1480         for (i = 0; i < NUM_REASSEMBLY; i++)
1481                 hdev->reassembly[i] = NULL;
1482
1483         init_waitqueue_head(&hdev->req_wait_q);
1484         mutex_init(&hdev->req_lock);
1485
1486         inquiry_cache_init(hdev);
1487
1488         hci_conn_hash_init(hdev);
1489
1490         INIT_LIST_HEAD(&hdev->mgmt_pending);
1491
1492         INIT_LIST_HEAD(&hdev->blacklist);
1493
1494         INIT_LIST_HEAD(&hdev->uuids);
1495
1496         INIT_LIST_HEAD(&hdev->link_keys);
1497
1498         INIT_LIST_HEAD(&hdev->remote_oob_data);
1499
1500         INIT_LIST_HEAD(&hdev->adv_entries);
1501         setup_timer(&hdev->adv_timer, hci_clear_adv_cache,
1502                                                 (unsigned long) hdev);
1503
1504         INIT_WORK(&hdev->power_on, hci_power_on);
1505         INIT_DELAYED_WORK(&hdev->power_off, hci_power_off);
1506
1507         INIT_DELAYED_WORK(&hdev->discov_off, hci_discov_off);
1508
1509         memset(&hdev->stat, 0, sizeof(struct hci_dev_stats));
1510
1511         atomic_set(&hdev->promisc, 0);
1512
1513         write_unlock_bh(&hci_dev_list_lock);
1514
1515         hdev->workqueue = create_singlethread_workqueue(hdev->name);
1516         if (!hdev->workqueue) {
1517                 error = -ENOMEM;
1518                 goto err;
1519         }
1520
1521         error = hci_add_sysfs(hdev);
1522         if (error < 0)
1523                 goto err_wqueue;
1524
1525         hdev->rfkill = rfkill_alloc(hdev->name, &hdev->dev,
1526                                 RFKILL_TYPE_BLUETOOTH, &hci_rfkill_ops, hdev);
1527         if (hdev->rfkill) {
1528                 if (rfkill_register(hdev->rfkill) < 0) {
1529                         rfkill_destroy(hdev->rfkill);
1530                         hdev->rfkill = NULL;
1531                 }
1532         }
1533
1534         set_bit(HCI_AUTO_OFF, &hdev->flags);
1535         set_bit(HCI_SETUP, &hdev->flags);
1536         queue_work(hdev->workqueue, &hdev->power_on);
1537
1538         hci_notify(hdev, HCI_DEV_REG);
1539
1540         return id;
1541
1542 err_wqueue:
1543         destroy_workqueue(hdev->workqueue);
1544 err:
1545         write_lock_bh(&hci_dev_list_lock);
1546         list_del(&hdev->list);
1547         write_unlock_bh(&hci_dev_list_lock);
1548
1549         return error;
1550 }
1551 EXPORT_SYMBOL(hci_register_dev);
1552
1553 /* Unregister HCI device */
1554 void hci_unregister_dev(struct hci_dev *hdev)
1555 {
1556         int i;
1557
1558         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
1559
1560         write_lock_bh(&hci_dev_list_lock);
1561         list_del(&hdev->list);
1562         write_unlock_bh(&hci_dev_list_lock);
1563
1564         hci_dev_do_close(hdev);
1565
1566         for (i = 0; i < NUM_REASSEMBLY; i++)
1567                 kfree_skb(hdev->reassembly[i]);
1568
1569         if (!test_bit(HCI_INIT, &hdev->flags) &&
1570                                         !test_bit(HCI_SETUP, &hdev->flags)) {
1571                 hci_dev_lock_bh(hdev);
1572                 mgmt_index_removed(hdev);
1573                 hci_dev_unlock_bh(hdev);
1574         }
1575
1576         /* mgmt_index_removed should take care of emptying the
1577          * pending list */
1578         BUG_ON(!list_empty(&hdev->mgmt_pending));
1579
1580         hci_notify(hdev, HCI_DEV_UNREG);
1581
1582         if (hdev->rfkill) {
1583                 rfkill_unregister(hdev->rfkill);
1584                 rfkill_destroy(hdev->rfkill);
1585         }
1586
1587         hci_del_sysfs(hdev);
1588
1589         del_timer(&hdev->adv_timer);
1590
1591         destroy_workqueue(hdev->workqueue);
1592
1593         hci_dev_lock_bh(hdev);
1594         hci_blacklist_clear(hdev);
1595         hci_uuids_clear(hdev);
1596         hci_link_keys_clear(hdev);
1597         hci_remote_oob_data_clear(hdev);
1598         hci_adv_entries_clear(hdev);
1599         hci_dev_unlock_bh(hdev);
1600
1601         __hci_dev_put(hdev);
1602 }
1603 EXPORT_SYMBOL(hci_unregister_dev);
1604
1605 /* Suspend HCI device */
1606 int hci_suspend_dev(struct hci_dev *hdev)
1607 {
1608         hci_notify(hdev, HCI_DEV_SUSPEND);
1609         return 0;
1610 }
1611 EXPORT_SYMBOL(hci_suspend_dev);
1612
1613 /* Resume HCI device */
1614 int hci_resume_dev(struct hci_dev *hdev)
1615 {
1616         hci_notify(hdev, HCI_DEV_RESUME);
1617         return 0;
1618 }
1619 EXPORT_SYMBOL(hci_resume_dev);
1620
1621 /* Receive frame from HCI drivers */
1622 int hci_recv_frame(struct sk_buff *skb)
1623 {
1624         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
1625         if (!hdev || (!test_bit(HCI_UP, &hdev->flags)
1626                                 && !test_bit(HCI_INIT, &hdev->flags))) {
1627                 kfree_skb(skb);
1628                 return -ENXIO;
1629         }
1630
1631         /* Incomming skb */
1632         bt_cb(skb)->incoming = 1;
1633
1634         /* Time stamp */
1635         __net_timestamp(skb);
1636
1637         /* Queue frame for rx task */
1638         skb_queue_tail(&hdev->rx_q, skb);
1639         tasklet_schedule(&hdev->rx_task);
1640
1641         return 0;
1642 }
1643 EXPORT_SYMBOL(hci_recv_frame);
1644
1645 static int hci_reassembly(struct hci_dev *hdev, int type, void *data,
1646                                                   int count, __u8 index)
1647 {
1648         int len = 0;
1649         int hlen = 0;
1650         int remain = count;
1651         struct sk_buff *skb;
1652         struct bt_skb_cb *scb;
1653
1654         if ((type < HCI_ACLDATA_PKT || type > HCI_EVENT_PKT) ||
1655                                 index >= NUM_REASSEMBLY)
1656                 return -EILSEQ;
1657
1658         skb = hdev->reassembly[index];
1659
1660         if (!skb) {
1661                 switch (type) {
1662                 case HCI_ACLDATA_PKT:
1663                         len = HCI_MAX_FRAME_SIZE;
1664                         hlen = HCI_ACL_HDR_SIZE;
1665                         break;
1666                 case HCI_EVENT_PKT:
1667                         len = HCI_MAX_EVENT_SIZE;
1668                         hlen = HCI_EVENT_HDR_SIZE;
1669                         break;
1670                 case HCI_SCODATA_PKT:
1671                         len = HCI_MAX_SCO_SIZE;
1672                         hlen = HCI_SCO_HDR_SIZE;
1673                         break;
1674                 }
1675
1676                 skb = bt_skb_alloc(len, GFP_ATOMIC);
1677                 if (!skb)
1678                         return -ENOMEM;
1679
1680                 scb = (void *) skb->cb;
1681                 scb->expect = hlen;
1682                 scb->pkt_type = type;
1683
1684                 skb->dev = (void *) hdev;
1685                 hdev->reassembly[index] = skb;
1686         }
1687
1688         while (count) {
1689                 scb = (void *) skb->cb;
1690                 len = min(scb->expect, (__u16)count);
1691
1692                 memcpy(skb_put(skb, len), data, len);
1693
1694                 count -= len;
1695                 data += len;
1696                 scb->expect -= len;
1697                 remain = count;
1698
1699                 switch (type) {
1700                 case HCI_EVENT_PKT:
1701                         if (skb->len == HCI_EVENT_HDR_SIZE) {
1702                                 struct hci_event_hdr *h = hci_event_hdr(skb);
1703                                 scb->expect = h->plen;
1704
1705                                 if (skb_tailroom(skb) < scb->expect) {
1706                                         kfree_skb(skb);
1707                                         hdev->reassembly[index] = NULL;
1708                                         return -ENOMEM;
1709                                 }
1710                         }
1711                         break;
1712
1713                 case HCI_ACLDATA_PKT:
1714                         if (skb->len  == HCI_ACL_HDR_SIZE) {
1715                                 struct hci_acl_hdr *h = hci_acl_hdr(skb);
1716                                 scb->expect = __le16_to_cpu(h->dlen);
1717
1718                                 if (skb_tailroom(skb) < scb->expect) {
1719                                         kfree_skb(skb);
1720                                         hdev->reassembly[index] = NULL;
1721                                         return -ENOMEM;
1722                                 }
1723                         }
1724                         break;
1725
1726                 case HCI_SCODATA_PKT:
1727                         if (skb->len == HCI_SCO_HDR_SIZE) {
1728                                 struct hci_sco_hdr *h = hci_sco_hdr(skb);
1729                                 scb->expect = h->dlen;
1730
1731                                 if (skb_tailroom(skb) < scb->expect) {
1732                                         kfree_skb(skb);
1733                                         hdev->reassembly[index] = NULL;
1734                                         return -ENOMEM;
1735                                 }
1736                         }
1737                         break;
1738                 }
1739
1740                 if (scb->expect == 0) {
1741                         /* Complete frame */
1742
1743                         bt_cb(skb)->pkt_type = type;
1744                         hci_recv_frame(skb);
1745
1746                         hdev->reassembly[index] = NULL;
1747                         return remain;
1748                 }
1749         }
1750
1751         return remain;
1752 }
1753
1754 int hci_recv_fragment(struct hci_dev *hdev, int type, void *data, int count)
1755 {
1756         int rem = 0;
1757
1758         if (type < HCI_ACLDATA_PKT || type > HCI_EVENT_PKT)
1759                 return -EILSEQ;
1760
1761         while (count) {
1762                 rem = hci_reassembly(hdev, type, data, count, type - 1);
1763                 if (rem < 0)
1764                         return rem;
1765
1766                 data += (count - rem);
1767                 count = rem;
1768         }
1769
1770         return rem;
1771 }
1772 EXPORT_SYMBOL(hci_recv_fragment);
1773
1774 #define STREAM_REASSEMBLY 0
1775
1776 int hci_recv_stream_fragment(struct hci_dev *hdev, void *data, int count)
1777 {
1778         int type;
1779         int rem = 0;
1780
1781         while (count) {
1782                 struct sk_buff *skb = hdev->reassembly[STREAM_REASSEMBLY];
1783
1784                 if (!skb) {
1785                         struct { char type; } *pkt;
1786
1787                         /* Start of the frame */
1788                         pkt = data;
1789                         type = pkt->type;
1790
1791                         data++;
1792                         count--;
1793                 } else
1794                         type = bt_cb(skb)->pkt_type;
1795
1796                 rem = hci_reassembly(hdev, type, data, count,
1797                                                         STREAM_REASSEMBLY);
1798                 if (rem < 0)
1799                         return rem;
1800
1801                 data += (count - rem);
1802                 count = rem;
1803         }
1804
1805         return rem;
1806 }
1807 EXPORT_SYMBOL(hci_recv_stream_fragment);
1808
1809 /* ---- Interface to upper protocols ---- */
1810
1811 /* Register/Unregister protocols.
1812  * hci_task_lock is used to ensure that no tasks are running. */
1813 int hci_register_proto(struct hci_proto *hp)
1814 {
1815         int err = 0;
1816
1817         BT_DBG("%p name %s id %d", hp, hp->name, hp->id);
1818
1819         if (hp->id >= HCI_MAX_PROTO)
1820                 return -EINVAL;
1821
1822         write_lock_bh(&hci_task_lock);
1823
1824         if (!hci_proto[hp->id])
1825                 hci_proto[hp->id] = hp;
1826         else
1827                 err = -EEXIST;
1828
1829         write_unlock_bh(&hci_task_lock);
1830
1831         return err;
1832 }
1833 EXPORT_SYMBOL(hci_register_proto);
1834
1835 int hci_unregister_proto(struct hci_proto *hp)
1836 {
1837         int err = 0;
1838
1839         BT_DBG("%p name %s id %d", hp, hp->name, hp->id);
1840
1841         if (hp->id >= HCI_MAX_PROTO)
1842                 return -EINVAL;
1843
1844         write_lock_bh(&hci_task_lock);
1845
1846         if (hci_proto[hp->id])
1847                 hci_proto[hp->id] = NULL;
1848         else
1849                 err = -ENOENT;
1850
1851         write_unlock_bh(&hci_task_lock);
1852
1853         return err;
1854 }
1855 EXPORT_SYMBOL(hci_unregister_proto);
1856
1857 int hci_register_cb(struct hci_cb *cb)
1858 {
1859         BT_DBG("%p name %s", cb, cb->name);
1860
1861         write_lock_bh(&hci_cb_list_lock);
1862         list_add(&cb->list, &hci_cb_list);
1863         write_unlock_bh(&hci_cb_list_lock);
1864
1865         return 0;
1866 }
1867 EXPORT_SYMBOL(hci_register_cb);
1868
1869 int hci_unregister_cb(struct hci_cb *cb)
1870 {
1871         BT_DBG("%p name %s", cb, cb->name);
1872
1873         write_lock_bh(&hci_cb_list_lock);
1874         list_del(&cb->list);
1875         write_unlock_bh(&hci_cb_list_lock);
1876
1877         return 0;
1878 }
1879 EXPORT_SYMBOL(hci_unregister_cb);
1880
1881 static int hci_send_frame(struct sk_buff *skb)
1882 {
1883         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
1884
1885         if (!hdev) {
1886                 kfree_skb(skb);
1887                 return -ENODEV;
1888         }
1889
1890         BT_DBG("%s type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
1891
1892         if (atomic_read(&hdev->promisc)) {
1893                 /* Time stamp */
1894                 __net_timestamp(skb);
1895
1896                 hci_send_to_sock(hdev, skb, NULL);
1897         }
1898
1899         /* Get rid of skb owner, prior to sending to the driver. */
1900         skb_orphan(skb);
1901
1902         return hdev->send(skb);
1903 }
1904
1905 /* Send HCI command */
1906 int hci_send_cmd(struct hci_dev *hdev, __u16 opcode, __u32 plen, void *param)
1907 {
1908         int len = HCI_COMMAND_HDR_SIZE + plen;
1909         struct hci_command_hdr *hdr;
1910         struct sk_buff *skb;
1911
1912         BT_DBG("%s opcode 0x%x plen %d", hdev->name, opcode, plen);
1913
1914         skb = bt_skb_alloc(len, GFP_ATOMIC);
1915         if (!skb) {
1916                 BT_ERR("%s no memory for command", hdev->name);
1917                 return -ENOMEM;
1918         }
1919
1920         hdr = (struct hci_command_hdr *) skb_put(skb, HCI_COMMAND_HDR_SIZE);
1921         hdr->opcode = cpu_to_le16(opcode);
1922         hdr->plen   = plen;
1923
1924         if (plen)
1925                 memcpy(skb_put(skb, plen), param, plen);
1926
1927         BT_DBG("skb len %d", skb->len);
1928
1929         bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
1930         skb->dev = (void *) hdev;
1931
1932         if (test_bit(HCI_INIT, &hdev->flags))
1933                 hdev->init_last_cmd = opcode;
1934
1935         skb_queue_tail(&hdev->cmd_q, skb);
1936         tasklet_schedule(&hdev->cmd_task);
1937
1938         return 0;
1939 }
1940
1941 /* Get data from the previously sent command */
1942 void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 opcode)
1943 {
1944         struct hci_command_hdr *hdr;
1945
1946         if (!hdev->sent_cmd)
1947                 return NULL;
1948
1949         hdr = (void *) hdev->sent_cmd->data;
1950
1951         if (hdr->opcode != cpu_to_le16(opcode))
1952                 return NULL;
1953
1954         BT_DBG("%s opcode 0x%x", hdev->name, opcode);
1955
1956         return hdev->sent_cmd->data + HCI_COMMAND_HDR_SIZE;
1957 }
1958
1959 /* Send ACL data */
1960 static void hci_add_acl_hdr(struct sk_buff *skb, __u16 handle, __u16 flags)
1961 {
1962         struct hci_acl_hdr *hdr;
1963         int len = skb->len;
1964
1965         skb_push(skb, HCI_ACL_HDR_SIZE);
1966         skb_reset_transport_header(skb);
1967         hdr = (struct hci_acl_hdr *)skb_transport_header(skb);
1968         hdr->handle = cpu_to_le16(hci_handle_pack(handle, flags));
1969         hdr->dlen   = cpu_to_le16(len);
1970 }
1971
1972 static void hci_queue_acl(struct hci_conn *conn, struct sk_buff_head *queue,
1973                                 struct sk_buff *skb, __u16 flags)
1974 {
1975         struct hci_dev *hdev = conn->hdev;
1976         struct sk_buff *list;
1977
1978         list = skb_shinfo(skb)->frag_list;
1979         if (!list) {
1980                 /* Non fragmented */
1981                 BT_DBG("%s nonfrag skb %p len %d", hdev->name, skb, skb->len);
1982
1983                 skb_queue_tail(queue, skb);
1984         } else {
1985                 /* Fragmented */
1986                 BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);
1987
1988                 skb_shinfo(skb)->frag_list = NULL;
1989
1990                 /* Queue all fragments atomically */
1991                 spin_lock_bh(&queue->lock);
1992
1993                 __skb_queue_tail(queue, skb);
1994
1995                 flags &= ~ACL_START;
1996                 flags |= ACL_CONT;
1997                 do {
1998                         skb = list; list = list->next;
1999
2000                         skb->dev = (void *) hdev;
2001                         bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
2002                         hci_add_acl_hdr(skb, conn->handle, flags);
2003
2004                         BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len);
2005
2006                         __skb_queue_tail(queue, skb);
2007                 } while (list);
2008
2009                 spin_unlock_bh(&queue->lock);
2010         }
2011 }
2012
2013 void hci_send_acl(struct hci_chan *chan, struct sk_buff *skb, __u16 flags)
2014 {
2015         struct hci_conn *conn = chan->conn;
2016         struct hci_dev *hdev = conn->hdev;
2017
2018         BT_DBG("%s chan %p flags 0x%x", hdev->name, chan, flags);
2019
2020         skb->dev = (void *) hdev;
2021         bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
2022         hci_add_acl_hdr(skb, conn->handle, flags);
2023
2024         hci_queue_acl(conn, &chan->data_q, skb, flags);
2025
2026         tasklet_schedule(&hdev->tx_task);
2027 }
2028 EXPORT_SYMBOL(hci_send_acl);
2029
2030 /* Send SCO data */
2031 void hci_send_sco(struct hci_conn *conn, struct sk_buff *skb)
2032 {
2033         struct hci_dev *hdev = conn->hdev;
2034         struct hci_sco_hdr hdr;
2035
2036         BT_DBG("%s len %d", hdev->name, skb->len);
2037
2038         hdr.handle = cpu_to_le16(conn->handle);
2039         hdr.dlen   = skb->len;
2040
2041         skb_push(skb, HCI_SCO_HDR_SIZE);
2042         skb_reset_transport_header(skb);
2043         memcpy(skb_transport_header(skb), &hdr, HCI_SCO_HDR_SIZE);
2044
2045         skb->dev = (void *) hdev;
2046         bt_cb(skb)->pkt_type = HCI_SCODATA_PKT;
2047
2048         skb_queue_tail(&conn->data_q, skb);
2049         tasklet_schedule(&hdev->tx_task);
2050 }
2051 EXPORT_SYMBOL(hci_send_sco);
2052
2053 /* ---- HCI TX task (outgoing data) ---- */
2054
2055 /* HCI Connection scheduler */
2056 static inline struct hci_conn *hci_low_sent(struct hci_dev *hdev, __u8 type, int *quote)
2057 {
2058         struct hci_conn_hash *h = &hdev->conn_hash;
2059         struct hci_conn *conn = NULL, *c;
2060         int num = 0, min = ~0;
2061
2062         /* We don't have to lock device here. Connections are always
2063          * added and removed with TX task disabled. */
2064         list_for_each_entry(c, &h->list, list) {
2065                 if (c->type != type || skb_queue_empty(&c->data_q))
2066                         continue;
2067
2068                 if (c->state != BT_CONNECTED && c->state != BT_CONFIG)
2069                         continue;
2070
2071                 num++;
2072
2073                 if (c->sent < min) {
2074                         min  = c->sent;
2075                         conn = c;
2076                 }
2077
2078                 if (hci_conn_num(hdev, type) == num)
2079                         break;
2080         }
2081
2082         if (conn) {
2083                 int cnt, q;
2084
2085                 switch (conn->type) {
2086                 case ACL_LINK:
2087                         cnt = hdev->acl_cnt;
2088                         break;
2089                 case SCO_LINK:
2090                 case ESCO_LINK:
2091                         cnt = hdev->sco_cnt;
2092                         break;
2093                 case LE_LINK:
2094                         cnt = hdev->le_mtu ? hdev->le_cnt : hdev->acl_cnt;
2095                         break;
2096                 default:
2097                         cnt = 0;
2098                         BT_ERR("Unknown link type");
2099                 }
2100
2101                 q = cnt / num;
2102                 *quote = q ? q : 1;
2103         } else
2104                 *quote = 0;
2105
2106         BT_DBG("conn %p quote %d", conn, *quote);
2107         return conn;
2108 }
2109
2110 static inline void hci_link_tx_to(struct hci_dev *hdev, __u8 type)
2111 {
2112         struct hci_conn_hash *h = &hdev->conn_hash;
2113         struct hci_conn *c;
2114
2115         BT_ERR("%s link tx timeout", hdev->name);
2116
2117         /* Kill stalled connections */
2118         list_for_each_entry(c, &h->list, list) {
2119                 if (c->type == type && c->sent) {
2120                         BT_ERR("%s killing stalled connection %s",
2121                                 hdev->name, batostr(&c->dst));
2122                         hci_acl_disconn(c, 0x13);
2123                 }
2124         }
2125 }
2126
2127 static inline struct hci_chan *hci_chan_sent(struct hci_dev *hdev, __u8 type,
2128                                                 int *quote)
2129 {
2130         struct hci_conn_hash *h = &hdev->conn_hash;
2131         struct hci_chan *chan = NULL;
2132         int num = 0, min = ~0, cur_prio = 0;
2133         struct hci_conn *conn;
2134         int cnt, q, conn_num = 0;
2135
2136         BT_DBG("%s", hdev->name);
2137
2138         list_for_each_entry(conn, &h->list, list) {
2139                 struct hci_chan_hash *ch;
2140                 struct hci_chan *tmp;
2141
2142                 if (conn->type != type)
2143                         continue;
2144
2145                 if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG)
2146                         continue;
2147
2148                 conn_num++;
2149
2150                 ch = &conn->chan_hash;
2151
2152                 list_for_each_entry(tmp, &ch->list, list) {
2153                         struct sk_buff *skb;
2154
2155                         if (skb_queue_empty(&tmp->data_q))
2156                                 continue;
2157
2158                         skb = skb_peek(&tmp->data_q);
2159                         if (skb->priority < cur_prio)
2160                                 continue;
2161
2162                         if (skb->priority > cur_prio) {
2163                                 num = 0;
2164                                 min = ~0;
2165                                 cur_prio = skb->priority;
2166                         }
2167
2168                         num++;
2169
2170                         if (conn->sent < min) {
2171                                 min  = conn->sent;
2172                                 chan = tmp;
2173                         }
2174                 }
2175
2176                 if (hci_conn_num(hdev, type) == conn_num)
2177                         break;
2178         }
2179
2180         if (!chan)
2181                 return NULL;
2182
2183         switch (chan->conn->type) {
2184         case ACL_LINK:
2185                 cnt = hdev->acl_cnt;
2186                 break;
2187         case SCO_LINK:
2188         case ESCO_LINK:
2189                 cnt = hdev->sco_cnt;
2190                 break;
2191         case LE_LINK:
2192                 cnt = hdev->le_mtu ? hdev->le_cnt : hdev->acl_cnt;
2193                 break;
2194         default:
2195                 cnt = 0;
2196                 BT_ERR("Unknown link type");
2197         }
2198
2199         q = cnt / num;
2200         *quote = q ? q : 1;
2201         BT_DBG("chan %p quote %d", chan, *quote);
2202         return chan;
2203 }
2204
2205 static void hci_prio_recalculate(struct hci_dev *hdev, __u8 type)
2206 {
2207         struct hci_conn_hash *h = &hdev->conn_hash;
2208         struct hci_conn *conn;
2209         int num = 0;
2210
2211         BT_DBG("%s", hdev->name);
2212
2213         list_for_each_entry(conn, &h->list, list) {
2214                 struct hci_chan_hash *ch;
2215                 struct hci_chan *chan;
2216
2217                 if (conn->type != type)
2218                         continue;
2219
2220                 if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG)
2221                         continue;
2222
2223                 num++;
2224
2225                 ch = &conn->chan_hash;
2226                 list_for_each_entry(chan, &ch->list, list) {
2227                         struct sk_buff *skb;
2228
2229                         if (chan->sent) {
2230                                 chan->sent = 0;
2231                                 continue;
2232                         }
2233
2234                         if (skb_queue_empty(&chan->data_q))
2235                                 continue;
2236
2237                         skb = skb_peek(&chan->data_q);
2238                         if (skb->priority >= HCI_PRIO_MAX - 1)
2239                                 continue;
2240
2241                         skb->priority = HCI_PRIO_MAX - 1;
2242
2243                         BT_DBG("chan %p skb %p promoted to %d", chan, skb,
2244                                                                 skb->priority);
2245                 }
2246
2247                 if (hci_conn_num(hdev, type) == num)
2248                         break;
2249         }
2250 }
2251
2252 static inline void hci_sched_acl(struct hci_dev *hdev)
2253 {
2254         struct hci_chan *chan;
2255         struct sk_buff *skb;
2256         int quote;
2257         unsigned int cnt;
2258
2259         BT_DBG("%s", hdev->name);
2260
2261         if (!hci_conn_num(hdev, ACL_LINK))
2262                 return;
2263
2264         if (!test_bit(HCI_RAW, &hdev->flags)) {
2265                 /* ACL tx timeout must be longer than maximum
2266                  * link supervision timeout (40.9 seconds) */
2267                 if (!hdev->acl_cnt && time_after(jiffies, hdev->acl_last_tx + HZ * 45))
2268                         hci_link_tx_to(hdev, ACL_LINK);
2269         }
2270
2271         cnt = hdev->acl_cnt;
2272
2273         while (hdev->acl_cnt &&
2274                         (chan = hci_chan_sent(hdev, ACL_LINK, &quote))) {
2275                 u32 priority = (skb_peek(&chan->data_q))->priority;
2276                 while (quote-- && (skb = skb_peek(&chan->data_q))) {
2277                         BT_DBG("chan %p skb %p len %d priority %u", chan, skb,
2278                                         skb->len, skb->priority);
2279
2280                         /* Stop if priority has changed */
2281                         if (skb->priority < priority)
2282                                 break;
2283
2284                         skb = skb_dequeue(&chan->data_q);
2285
2286                         hci_conn_enter_active_mode(chan->conn,
2287                                                 bt_cb(skb)->force_active);
2288
2289                         hci_send_frame(skb);
2290                         hdev->acl_last_tx = jiffies;
2291
2292                         hdev->acl_cnt--;
2293                         chan->sent++;
2294                         chan->conn->sent++;
2295                 }
2296         }
2297
2298         if (cnt != hdev->acl_cnt)
2299                 hci_prio_recalculate(hdev, ACL_LINK);
2300 }
2301
2302 /* Schedule SCO */
2303 static inline void hci_sched_sco(struct hci_dev *hdev)
2304 {
2305         struct hci_conn *conn;
2306         struct sk_buff *skb;
2307         int quote;
2308
2309         BT_DBG("%s", hdev->name);
2310
2311         if (!hci_conn_num(hdev, SCO_LINK))
2312                 return;
2313
2314         while (hdev->sco_cnt && (conn = hci_low_sent(hdev, SCO_LINK, &quote))) {
2315                 while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
2316                         BT_DBG("skb %p len %d", skb, skb->len);
2317                         hci_send_frame(skb);
2318
2319                         conn->sent++;
2320                         if (conn->sent == ~0)
2321                                 conn->sent = 0;
2322                 }
2323         }
2324 }
2325
2326 static inline void hci_sched_esco(struct hci_dev *hdev)
2327 {
2328         struct hci_conn *conn;
2329         struct sk_buff *skb;
2330         int quote;
2331
2332         BT_DBG("%s", hdev->name);
2333
2334         if (!hci_conn_num(hdev, ESCO_LINK))
2335                 return;
2336
2337         while (hdev->sco_cnt && (conn = hci_low_sent(hdev, ESCO_LINK, &quote))) {
2338                 while (quote-- && (skb = skb_dequeue(&conn->data_q))) {
2339                         BT_DBG("skb %p len %d", skb, skb->len);
2340                         hci_send_frame(skb);
2341
2342                         conn->sent++;
2343                         if (conn->sent == ~0)
2344                                 conn->sent = 0;
2345                 }
2346         }
2347 }
2348
2349 static inline void hci_sched_le(struct hci_dev *hdev)
2350 {
2351         struct hci_chan *chan;
2352         struct sk_buff *skb;
2353         int quote, cnt, tmp;
2354
2355         BT_DBG("%s", hdev->name);
2356
2357         if (!hci_conn_num(hdev, LE_LINK))
2358                 return;
2359
2360         if (!test_bit(HCI_RAW, &hdev->flags)) {
2361                 /* LE tx timeout must be longer than maximum
2362                  * link supervision timeout (40.9 seconds) */
2363                 if (!hdev->le_cnt && hdev->le_pkts &&
2364                                 time_after(jiffies, hdev->le_last_tx + HZ * 45))
2365                         hci_link_tx_to(hdev, LE_LINK);
2366         }
2367
2368         cnt = hdev->le_pkts ? hdev->le_cnt : hdev->acl_cnt;
2369         tmp = cnt;
2370         while (cnt && (chan = hci_chan_sent(hdev, LE_LINK, &quote))) {
2371                 u32 priority = (skb_peek(&chan->data_q))->priority;
2372                 while (quote-- && (skb = skb_peek(&chan->data_q))) {
2373                         BT_DBG("chan %p skb %p len %d priority %u", chan, skb,
2374                                         skb->len, skb->priority);
2375
2376                         /* Stop if priority has changed */
2377                         if (skb->priority < priority)
2378                                 break;
2379
2380                         skb = skb_dequeue(&chan->data_q);
2381
2382                         hci_send_frame(skb);
2383                         hdev->le_last_tx = jiffies;
2384
2385                         cnt--;
2386                         chan->sent++;
2387                         chan->conn->sent++;
2388                 }
2389         }
2390
2391         if (hdev->le_pkts)
2392                 hdev->le_cnt = cnt;
2393         else
2394                 hdev->acl_cnt = cnt;
2395
2396         if (cnt != tmp)
2397                 hci_prio_recalculate(hdev, LE_LINK);
2398 }
2399
2400 static void hci_tx_task(unsigned long arg)
2401 {
2402         struct hci_dev *hdev = (struct hci_dev *) arg;
2403         struct sk_buff *skb;
2404
2405         read_lock(&hci_task_lock);
2406
2407         BT_DBG("%s acl %d sco %d le %d", hdev->name, hdev->acl_cnt,
2408                 hdev->sco_cnt, hdev->le_cnt);
2409
2410         /* Schedule queues and send stuff to HCI driver */
2411
2412         hci_sched_acl(hdev);
2413
2414         hci_sched_sco(hdev);
2415
2416         hci_sched_esco(hdev);
2417
2418         hci_sched_le(hdev);
2419
2420         /* Send next queued raw (unknown type) packet */
2421         while ((skb = skb_dequeue(&hdev->raw_q)))
2422                 hci_send_frame(skb);
2423
2424         read_unlock(&hci_task_lock);
2425 }
2426
2427 /* ----- HCI RX task (incoming data processing) ----- */
2428
2429 /* ACL data packet */
2430 static inline void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb)
2431 {
2432         struct hci_acl_hdr *hdr = (void *) skb->data;
2433         struct hci_conn *conn;
2434         __u16 handle, flags;
2435
2436         skb_pull(skb, HCI_ACL_HDR_SIZE);
2437
2438         handle = __le16_to_cpu(hdr->handle);
2439         flags  = hci_flags(handle);
2440         handle = hci_handle(handle);
2441
2442         BT_DBG("%s len %d handle 0x%x flags 0x%x", hdev->name, skb->len, handle, flags);
2443
2444         hdev->stat.acl_rx++;
2445
2446         hci_dev_lock(hdev);
2447         conn = hci_conn_hash_lookup_handle(hdev, handle);
2448         hci_dev_unlock(hdev);
2449
2450         if (conn) {
2451                 register struct hci_proto *hp;
2452
2453                 hci_conn_enter_active_mode(conn, bt_cb(skb)->force_active);
2454
2455                 /* Send to upper protocol */
2456                 hp = hci_proto[HCI_PROTO_L2CAP];
2457                 if (hp && hp->recv_acldata) {
2458                         hp->recv_acldata(conn, skb, flags);
2459                         return;
2460                 }
2461         } else {
2462                 BT_ERR("%s ACL packet for unknown connection handle %d",
2463                         hdev->name, handle);
2464         }
2465
2466         kfree_skb(skb);
2467 }
2468
2469 /* SCO data packet */
2470 static inline void hci_scodata_packet(struct hci_dev *hdev, struct sk_buff *skb)
2471 {
2472         struct hci_sco_hdr *hdr = (void *) skb->data;
2473         struct hci_conn *conn;
2474         __u16 handle;
2475
2476         skb_pull(skb, HCI_SCO_HDR_SIZE);
2477
2478         handle = __le16_to_cpu(hdr->handle);
2479
2480         BT_DBG("%s len %d handle 0x%x", hdev->name, skb->len, handle);
2481
2482         hdev->stat.sco_rx++;
2483
2484         hci_dev_lock(hdev);
2485         conn = hci_conn_hash_lookup_handle(hdev, handle);
2486         hci_dev_unlock(hdev);
2487
2488         if (conn) {
2489                 register struct hci_proto *hp;
2490
2491                 /* Send to upper protocol */
2492                 hp = hci_proto[HCI_PROTO_SCO];
2493                 if (hp && hp->recv_scodata) {
2494                         hp->recv_scodata(conn, skb);
2495                         return;
2496                 }
2497         } else {
2498                 BT_ERR("%s SCO packet for unknown connection handle %d",
2499                         hdev->name, handle);
2500         }
2501
2502         kfree_skb(skb);
2503 }
2504
2505 static void hci_rx_task(unsigned long arg)
2506 {
2507         struct hci_dev *hdev = (struct hci_dev *) arg;
2508         struct sk_buff *skb;
2509
2510         BT_DBG("%s", hdev->name);
2511
2512         read_lock(&hci_task_lock);
2513
2514         while ((skb = skb_dequeue(&hdev->rx_q))) {
2515                 if (atomic_read(&hdev->promisc)) {
2516                         /* Send copy to the sockets */
2517                         hci_send_to_sock(hdev, skb, NULL);
2518                 }
2519
2520                 if (test_bit(HCI_RAW, &hdev->flags)) {
2521                         kfree_skb(skb);
2522                         continue;
2523                 }
2524
2525                 if (test_bit(HCI_INIT, &hdev->flags)) {
2526                         /* Don't process data packets in this states. */
2527                         switch (bt_cb(skb)->pkt_type) {
2528                         case HCI_ACLDATA_PKT:
2529                         case HCI_SCODATA_PKT:
2530                                 kfree_skb(skb);
2531                                 continue;
2532                         }
2533                 }
2534
2535                 /* Process frame */
2536                 switch (bt_cb(skb)->pkt_type) {
2537                 case HCI_EVENT_PKT:
2538                         hci_event_packet(hdev, skb);
2539                         break;
2540
2541                 case HCI_ACLDATA_PKT:
2542                         BT_DBG("%s ACL data packet", hdev->name);
2543                         hci_acldata_packet(hdev, skb);
2544                         break;
2545
2546                 case HCI_SCODATA_PKT:
2547                         BT_DBG("%s SCO data packet", hdev->name);
2548                         hci_scodata_packet(hdev, skb);
2549                         break;
2550
2551                 default:
2552                         kfree_skb(skb);
2553                         break;
2554                 }
2555         }
2556
2557         read_unlock(&hci_task_lock);
2558 }
2559
2560 static void hci_cmd_task(unsigned long arg)
2561 {
2562         struct hci_dev *hdev = (struct hci_dev *) arg;
2563         struct sk_buff *skb;
2564
2565         BT_DBG("%s cmd %d", hdev->name, atomic_read(&hdev->cmd_cnt));
2566
2567         /* Send queued commands */
2568         if (atomic_read(&hdev->cmd_cnt)) {
2569                 skb = skb_dequeue(&hdev->cmd_q);
2570                 if (!skb)
2571                         return;
2572
2573                 kfree_skb(hdev->sent_cmd);
2574
2575                 hdev->sent_cmd = skb_clone(skb, GFP_ATOMIC);
2576                 if (hdev->sent_cmd) {
2577                         atomic_dec(&hdev->cmd_cnt);
2578                         hci_send_frame(skb);
2579                         if (test_bit(HCI_RESET, &hdev->flags))
2580                                 del_timer(&hdev->cmd_timer);
2581                         else
2582                                 mod_timer(&hdev->cmd_timer,
2583                                   jiffies + msecs_to_jiffies(HCI_CMD_TIMEOUT));
2584                 } else {
2585                         skb_queue_head(&hdev->cmd_q, skb);
2586                         tasklet_schedule(&hdev->cmd_task);
2587                 }
2588         }
2589 }
2590
2591 int hci_do_inquiry(struct hci_dev *hdev, u8 length)
2592 {
2593         /* General inquiry access code (GIAC) */
2594         u8 lap[3] = { 0x33, 0x8b, 0x9e };
2595         struct hci_cp_inquiry cp;
2596
2597         BT_DBG("%s", hdev->name);
2598
2599         if (test_bit(HCI_INQUIRY, &hdev->flags))
2600                 return -EINPROGRESS;
2601
2602         memset(&cp, 0, sizeof(cp));
2603         memcpy(&cp.lap, lap, sizeof(cp.lap));
2604         cp.length  = length;
2605
2606         return hci_send_cmd(hdev, HCI_OP_INQUIRY, sizeof(cp), &cp);
2607 }
2608
2609 int hci_cancel_inquiry(struct hci_dev *hdev)
2610 {
2611         BT_DBG("%s", hdev->name);
2612
2613         if (!test_bit(HCI_INQUIRY, &hdev->flags))
2614                 return -EPERM;
2615
2616         return hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL);
2617 }