net/bluetooth/hci_conn.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 connection handling. */
  26
  27 #include <linux/module.h>
  28
  29 #include <linux/types.h>
  30 #include <linux/errno.h>
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/poll.h>
  34 #include <linux/fcntl.h>
  35 #include <linux/init.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/notifier.h>
  39 #include <net/sock.h>
  40
  41 #include <asm/system.h>
  42 #include <asm/uaccess.h>
  43 #include <asm/unaligned.h>
  44
  45 #include <net/bluetooth/bluetooth.h>
  46 #include <net/bluetooth/hci_core.h>
  47
  48 #ifndef CONFIG_BT_HCI_CORE_DEBUG
  49 #undef  BT_DBG
  50 #define BT_DBG(D...)
  51 #endif
  52
  53 void hci_acl_connect(struct hci_conn *conn)
  54 {
  55         struct hci_dev *hdev = conn->hdev;
  56         struct inquiry_entry *ie;
  57         struct hci_cp_create_conn cp;
  58
  59         BT_DBG("%p", conn);
  60
  61         conn->state = BT_CONNECT;
  62         conn->out = 1;
  63
  64         conn->link_mode = HCI_LM_MASTER;
  65
  66         conn->attempt++;
  67
  68         conn->link_policy = hdev->link_policy;
  69
  70         memset(&cp, 0, sizeof(cp));
  71         bacpy(&cp.bdaddr, &conn->dst);
  72         cp.pscan_rep_mode = 0x02;
  73
  74         if ((ie = hci_inquiry_cache_lookup(hdev, &conn->dst))) {
  75                 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
  76                         cp.pscan_rep_mode = ie->data.pscan_rep_mode;
  77                         cp.pscan_mode     = ie->data.pscan_mode;
  78                         cp.clock_offset   = ie->data.clock_offset |
  79                                                         cpu_to_le16(0x8000);
  80                 }
  81
  82                 memcpy(conn->dev_class, ie->data.dev_class, 3);
  83                 conn->ssp_mode = ie->data.ssp_mode;
  84         }
  85
  86         cp.pkt_type = cpu_to_le16(conn->pkt_type);
  87         if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
  88                 cp.role_switch = 0x01;
  89         else
  90                 cp.role_switch = 0x00;
  91
  92         hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
  93 }
  94
  95 static void hci_acl_connect_cancel(struct hci_conn *conn)
  96 {
  97         struct hci_cp_create_conn_cancel cp;
  98
  99         BT_DBG("%p", conn);
 100
 101         if (conn->hdev->hci_ver < 2)
 102                 return;
 103
 104         bacpy(&cp.bdaddr, &conn->dst);
 105         hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
 106 }
 107
 108 void hci_acl_disconn(struct hci_conn *conn, __u8 reason)
 109 {
 110         struct hci_cp_disconnect cp;
 111
 112         BT_DBG("%p", conn);
 113
 114         conn->state = BT_DISCONN;
 115
 116         cp.handle = cpu_to_le16(conn->handle);
 117         cp.reason = reason;
 118         hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
 119 }
 120
 121 void hci_add_sco(struct hci_conn *conn, __u16 handle)
 122 {
 123         struct hci_dev *hdev = conn->hdev;
 124         struct hci_cp_add_sco cp;
 125
 126         BT_DBG("%p", conn);
 127
 128         conn->state = BT_CONNECT;
 129         conn->out = 1;
 130
 131         cp.handle   = cpu_to_le16(handle);
 132         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 133
 134         hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 135 }
 136
 137 void hci_setup_sync(struct hci_conn *conn, __u16 handle)
 138 {
 139         struct hci_dev *hdev = conn->hdev;
 140         struct hci_cp_setup_sync_conn cp;
 141
 142         BT_DBG("%p", conn);
 143
 144         conn->state = BT_CONNECT;
 145         conn->out = 1;
 146
 147         cp.handle   = cpu_to_le16(handle);
 148         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 149
 150         cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
 151         cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
 152         cp.max_latency    = cpu_to_le16(0xffff);
 153         cp.voice_setting  = cpu_to_le16(hdev->voice_setting);
 154         cp.retrans_effort = 0xff;
 155
 156         hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp);
 157 }
 158
 159 static void hci_conn_timeout(unsigned long arg)
 160 {
 161         struct hci_conn *conn = (void *) arg;
 162         struct hci_dev *hdev = conn->hdev;
 163
 164         BT_DBG("conn %p state %d", conn, conn->state);
 165
 166         if (atomic_read(&conn->refcnt))
 167                 return;
 168
 169         hci_dev_lock(hdev);
 170
 171         switch (conn->state) {
 172         case BT_CONNECT:
 173         case BT_CONNECT2:
 174                 if (conn->type == ACL_LINK)
 175                         hci_acl_connect_cancel(conn);
 176                 else
 177                         hci_acl_disconn(conn, 0x13);
 178                 break;
 179         case BT_CONFIG:
 180         case BT_CONNECTED:
 181                 hci_acl_disconn(conn, 0x13);
 182                 break;
 183         default:
 184                 conn->state = BT_CLOSED;
 185                 break;
 186         }
 187
 188         hci_dev_unlock(hdev);
 189 }
 190
 191 static void hci_conn_idle(unsigned long arg)
 192 {
 193         struct hci_conn *conn = (void *) arg;
 194
 195         BT_DBG("conn %p mode %d", conn, conn->mode);
 196
 197         hci_conn_enter_sniff_mode(conn);
 198 }
 199
 200 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 201 {
 202         struct hci_conn *conn;
 203
 204         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 205
 206         conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
 207         if (!conn)
 208                 return NULL;
 209
 210         bacpy(&conn->dst, dst);
 211         conn->hdev  = hdev;
 212         conn->type  = type;
 213         conn->mode  = HCI_CM_ACTIVE;
 214         conn->state = BT_OPEN;
 215
 216         conn->power_save = 1;
 217
 218         switch (type) {
 219         case ACL_LINK:
 220                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 221                 break;
 222         case SCO_LINK:
 223                 if (lmp_esco_capable(hdev))
 224                         conn->pkt_type = hdev->esco_type & SCO_ESCO_MASK;
 225                 else
 226                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 227                 break;
 228         case ESCO_LINK:
 229                 conn->pkt_type = hdev->esco_type;
 230                 break;
 231         }
 232
 233         skb_queue_head_init(&conn->data_q);
 234
 235         setup_timer(&conn->disc_timer, hci_conn_timeout, (unsigned long)conn);
 236         setup_timer(&conn->idle_timer, hci_conn_idle, (unsigned long)conn);
 237
 238         atomic_set(&conn->refcnt, 0);
 239
 240         hci_dev_hold(hdev);
 241
 242         tasklet_disable(&hdev->tx_task);
 243
 244         hci_conn_hash_add(hdev, conn);
 245         if (hdev->notify)
 246                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 247
 248         tasklet_enable(&hdev->tx_task);
 249
 250         return conn;
 251 }
 252
 253 int hci_conn_del(struct hci_conn *conn)
 254 {
 255         struct hci_dev *hdev = conn->hdev;
 256
 257         BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
 258
 259         del_timer(&conn->idle_timer);
 260
 261         del_timer(&conn->disc_timer);
 262
 263         if (conn->type == ACL_LINK) {
 264                 struct hci_conn *sco = conn->link;
 265                 if (sco)
 266                         sco->link = NULL;
 267
 268                 /* Unacked frames */
 269                 hdev->acl_cnt += conn->sent;
 270         } else {
 271                 struct hci_conn *acl = conn->link;
 272                 if (acl) {
 273                         acl->link = NULL;
 274                         hci_conn_put(acl);
 275                 }
 276         }
 277
 278         tasklet_disable(&hdev->tx_task);
 279
 280         hci_conn_hash_del(hdev, conn);
 281         if (hdev->notify)
 282                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 283
 284         tasklet_enable(&hdev->tx_task);
 285
 286         skb_queue_purge(&conn->data_q);
 287
 288         return 0;
 289 }
 290
 291 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
 292 {
 293         int use_src = bacmp(src, BDADDR_ANY);
 294         struct hci_dev *hdev = NULL;
 295         struct list_head *p;
 296
 297         BT_DBG("%s -> %s", batostr(src), batostr(dst));
 298
 299         read_lock_bh(&hci_dev_list_lock);
 300
 301         list_for_each(p, &hci_dev_list) {
 302                 struct hci_dev *d = list_entry(p, struct hci_dev, list);
 303
 304                 if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
 305                         continue;
 306
 307                 /* Simple routing:
 308                  *   No source address - find interface with bdaddr != dst
 309                  *   Source address    - find interface with bdaddr == src
 310                  */
 311
 312                 if (use_src) {
 313                         if (!bacmp(&d->bdaddr, src)) {
 314                                 hdev = d; break;
 315                         }
 316                 } else {
 317                         if (bacmp(&d->bdaddr, dst)) {
 318                                 hdev = d; break;
 319                         }
 320                 }
 321         }
 322
 323         if (hdev)
 324                 hdev = hci_dev_hold(hdev);
 325
 326         read_unlock_bh(&hci_dev_list_lock);
 327         return hdev;
 328 }
 329 EXPORT_SYMBOL(hci_get_route);
 330
 331 /* Create SCO or ACL connection.
 332  * Device _must_ be locked */
 333 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 auth_type)
 334 {
 335         struct hci_conn *acl;
 336         struct hci_conn *sco;
 337
 338         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 339
 340         if (!(acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst))) {
 341                 if (!(acl = hci_conn_add(hdev, ACL_LINK, dst)))
 342                         return NULL;
 343         }
 344
 345         hci_conn_hold(acl);
 346
 347         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
 348                 acl->auth_type = auth_type;
 349                 hci_acl_connect(acl);
 350         }
 351
 352         if (type == ACL_LINK)
 353                 return acl;
 354
 355         if (!(sco = hci_conn_hash_lookup_ba(hdev, type, dst))) {
 356                 if (!(sco = hci_conn_add(hdev, type, dst))) {
 357                         hci_conn_put(acl);
 358                         return NULL;
 359                 }
 360         }
 361
 362         acl->link = sco;
 363         sco->link = acl;
 364
 365         hci_conn_hold(sco);
 366
 367         if (acl->state == BT_CONNECTED &&
 368                         (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 369                 if (lmp_esco_capable(hdev))
 370                         hci_setup_sync(sco, acl->handle);
 371                 else
 372                         hci_add_sco(sco, acl->handle);
 373         }
 374
 375         return sco;
 376 }
 377 EXPORT_SYMBOL(hci_connect);
 378
 379 /* Check link security requirement */
 380 int hci_conn_check_link_mode(struct hci_conn *conn)
 381 {
 382         BT_DBG("conn %p", conn);
 383
 384         if (conn->ssp_mode > 0 && conn->hdev->ssp_mode > 0 &&
 385                                         !(conn->link_mode & HCI_LM_ENCRYPT))
 386                 return 0;
 387
 388         return 1;
 389 }
 390 EXPORT_SYMBOL(hci_conn_check_link_mode);
 391
 392 /* Authenticate remote device */
 393 int hci_conn_auth(struct hci_conn *conn)
 394 {
 395         BT_DBG("conn %p", conn);
 396
 397         if (conn->ssp_mode > 0 && conn->hdev->ssp_mode > 0) {
 398                 if (!(conn->auth_type & 0x01)) {
 399                         conn->auth_type |= 0x01;
 400                         conn->link_mode &= ~HCI_LM_AUTH;
 401                 }
 402         }
 403
 404         if (conn->link_mode & HCI_LM_AUTH)
 405                 return 1;
 406
 407         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 408                 struct hci_cp_auth_requested cp;
 409                 cp.handle = cpu_to_le16(conn->handle);
 410                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 411                                                         sizeof(cp), &cp);
 412         }
 413         return 0;
 414 }
 415 EXPORT_SYMBOL(hci_conn_auth);
 416
 417 /* Enable encryption */
 418 int hci_conn_encrypt(struct hci_conn *conn)
 419 {
 420         BT_DBG("conn %p", conn);
 421
 422         if (conn->link_mode & HCI_LM_ENCRYPT)
 423                 return hci_conn_auth(conn);
 424
 425         if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
 426                 return 0;
 427
 428         if (hci_conn_auth(conn)) {
 429                 struct hci_cp_set_conn_encrypt cp;
 430                 cp.handle  = cpu_to_le16(conn->handle);
 431                 cp.encrypt = 1;
 432                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT,
 433                                                         sizeof(cp), &cp);
 434         }
 435         return 0;
 436 }
 437 EXPORT_SYMBOL(hci_conn_encrypt);
 438
 439 /* Change link key */
 440 int hci_conn_change_link_key(struct hci_conn *conn)
 441 {
 442         BT_DBG("conn %p", conn);
 443
 444         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 445                 struct hci_cp_change_conn_link_key cp;
 446                 cp.handle = cpu_to_le16(conn->handle);
 447                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 448                                                         sizeof(cp), &cp);
 449         }
 450         return 0;
 451 }
 452 EXPORT_SYMBOL(hci_conn_change_link_key);
 453
 454 /* Switch role */
 455 int hci_conn_switch_role(struct hci_conn *conn, uint8_t role)
 456 {
 457         BT_DBG("conn %p", conn);
 458
 459         if (!role && conn->link_mode & HCI_LM_MASTER)
 460                 return 1;
 461
 462         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
 463                 struct hci_cp_switch_role cp;
 464                 bacpy(&cp.bdaddr, &conn->dst);
 465                 cp.role = role;
 466                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 467         }
 468         return 0;
 469 }
 470 EXPORT_SYMBOL(hci_conn_switch_role);
 471
 472 /* Enter active mode */
 473 void hci_conn_enter_active_mode(struct hci_conn *conn)
 474 {
 475         struct hci_dev *hdev = conn->hdev;
 476
 477         BT_DBG("conn %p mode %d", conn, conn->mode);
 478
 479         if (test_bit(HCI_RAW, &hdev->flags))
 480                 return;
 481
 482         if (conn->mode != HCI_CM_SNIFF || !conn->power_save)
 483                 goto timer;
 484
 485         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 486                 struct hci_cp_exit_sniff_mode cp;
 487                 cp.handle = cpu_to_le16(conn->handle);
 488                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 489         }
 490
 491 timer:
 492         if (hdev->idle_timeout > 0)
 493                 mod_timer(&conn->idle_timer,
 494                         jiffies + msecs_to_jiffies(hdev->idle_timeout));
 495 }
 496
 497 /* Enter sniff mode */
 498 void hci_conn_enter_sniff_mode(struct hci_conn *conn)
 499 {
 500         struct hci_dev *hdev = conn->hdev;
 501
 502         BT_DBG("conn %p mode %d", conn, conn->mode);
 503
 504         if (test_bit(HCI_RAW, &hdev->flags))
 505                 return;
 506
 507         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 508                 return;
 509
 510         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 511                 return;
 512
 513         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 514                 struct hci_cp_sniff_subrate cp;
 515                 cp.handle             = cpu_to_le16(conn->handle);
 516                 cp.max_latency        = cpu_to_le16(0);
 517                 cp.min_remote_timeout = cpu_to_le16(0);
 518                 cp.min_local_timeout  = cpu_to_le16(0);
 519                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 520         }
 521
 522         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 523                 struct hci_cp_sniff_mode cp;
 524                 cp.handle       = cpu_to_le16(conn->handle);
 525                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 526                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 527                 cp.attempt      = cpu_to_le16(4);
 528                 cp.timeout      = cpu_to_le16(1);
 529                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 530         }
 531 }
 532
 533 /* Drop all connection on the device */
 534 void hci_conn_hash_flush(struct hci_dev *hdev)
 535 {
 536         struct hci_conn_hash *h = &hdev->conn_hash;
 537         struct list_head *p;
 538
 539         BT_DBG("hdev %s", hdev->name);
 540
 541         p = h->list.next;
 542         while (p != &h->list) {
 543                 struct hci_conn *c;
 544
 545                 c = list_entry(p, struct hci_conn, list);
 546                 p = p->next;
 547
 548                 c->state = BT_CLOSED;
 549
 550                 hci_conn_del_sysfs(c);
 551
 552                 hci_proto_disconn_ind(c, 0x16);
 553                 hci_conn_del(c);
 554         }
 555 }
 556
 557 /* Check pending connect attempts */
 558 void hci_conn_check_pending(struct hci_dev *hdev)
 559 {
 560         struct hci_conn *conn;
 561
 562         BT_DBG("hdev %s", hdev->name);
 563
 564         hci_dev_lock(hdev);
 565
 566         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
 567         if (conn)
 568                 hci_acl_connect(conn);
 569
 570         hci_dev_unlock(hdev);
 571 }
 572
 573 int hci_get_conn_list(void __user *arg)
 574 {
 575         struct hci_conn_list_req req, *cl;
 576         struct hci_conn_info *ci;
 577         struct hci_dev *hdev;
 578         struct list_head *p;
 579         int n = 0, size, err;
 580
 581         if (copy_from_user(&req, arg, sizeof(req)))
 582                 return -EFAULT;
 583
 584         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
 585                 return -EINVAL;
 586
 587         size = sizeof(req) + req.conn_num * sizeof(*ci);
 588
 589         if (!(cl = kmalloc(size, GFP_KERNEL)))
 590                 return -ENOMEM;
 591
 592         if (!(hdev = hci_dev_get(req.dev_id))) {
 593                 kfree(cl);
 594                 return -ENODEV;
 595         }
 596
 597         ci = cl->conn_info;
 598
 599         hci_dev_lock_bh(hdev);
 600         list_for_each(p, &hdev->conn_hash.list) {
 601                 register struct hci_conn *c;
 602                 c = list_entry(p, struct hci_conn, list);
 603
 604                 bacpy(&(ci + n)->bdaddr, &c->dst);
 605                 (ci + n)->handle = c->handle;
 606                 (ci + n)->type  = c->type;
 607                 (ci + n)->out   = c->out;
 608                 (ci + n)->state = c->state;
 609                 (ci + n)->link_mode = c->link_mode;
 610                 if (++n >= req.conn_num)
 611                         break;
 612         }
 613         hci_dev_unlock_bh(hdev);
 614
 615         cl->dev_id = hdev->id;
 616         cl->conn_num = n;
 617         size = sizeof(req) + n * sizeof(*ci);
 618
 619         hci_dev_put(hdev);
 620
 621         err = copy_to_user(arg, cl, size);
 622         kfree(cl);
 623
 624         return err ? -EFAULT : 0;
 625 }
 626
 627 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
 628 {
 629         struct hci_conn_info_req req;
 630         struct hci_conn_info ci;
 631         struct hci_conn *conn;
 632         char __user *ptr = arg + sizeof(req);
 633
 634         if (copy_from_user(&req, arg, sizeof(req)))
 635                 return -EFAULT;
 636
 637         hci_dev_lock_bh(hdev);
 638         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
 639         if (conn) {
 640                 bacpy(&ci.bdaddr, &conn->dst);
 641                 ci.handle = conn->handle;
 642                 ci.type  = conn->type;
 643                 ci.out   = conn->out;
 644                 ci.state = conn->state;
 645                 ci.link_mode = conn->link_mode;
 646         }
 647         hci_dev_unlock_bh(hdev);
 648
 649         if (!conn)
 650                 return -ENOENT;
 651
 652         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
 653 }
 654
 655 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
 656 {
 657         struct hci_auth_info_req req;
 658         struct hci_conn *conn;
 659
 660         if (copy_from_user(&req, arg, sizeof(req)))
 661                 return -EFAULT;
 662
 663         hci_dev_lock_bh(hdev);
 664         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
 665         if (conn)
 666                 req.type = conn->auth_type;
 667         hci_dev_unlock_bh(hdev);
 668
 669         if (!conn)
 670                 return -ENOENT;
 671
 672         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
 673 }