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)
 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                 hci_acl_connect(acl);
 349
 350         if (type == ACL_LINK)
 351                 return acl;
 352
 353         if (!(sco = hci_conn_hash_lookup_ba(hdev, type, dst))) {
 354                 if (!(sco = hci_conn_add(hdev, type, dst))) {
 355                         hci_conn_put(acl);
 356                         return NULL;
 357                 }
 358         }
 359
 360         acl->link = sco;
 361         sco->link = acl;
 362
 363         hci_conn_hold(sco);
 364
 365         if (acl->state == BT_CONNECTED &&
 366                         (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 367                 if (lmp_esco_capable(hdev))
 368                         hci_setup_sync(sco, acl->handle);
 369                 else
 370                         hci_add_sco(sco, acl->handle);
 371         }
 372
 373         return sco;
 374 }
 375 EXPORT_SYMBOL(hci_connect);
 376
 377 /* Authenticate remote device */
 378 int hci_conn_auth(struct hci_conn *conn)
 379 {
 380         BT_DBG("conn %p", conn);
 381
 382         if (conn->ssp_mode > 0 && conn->hdev->ssp_mode > 0) {
 383                 if (!(conn->auth_type & 0x01)) {
 384                         conn->auth_type = HCI_AT_GENERAL_BONDING_MITM;
 385                         conn->link_mode &= ~HCI_LM_AUTH;
 386                 }
 387         }
 388
 389         if (conn->link_mode & HCI_LM_AUTH)
 390                 return 1;
 391
 392         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 393                 struct hci_cp_auth_requested cp;
 394                 cp.handle = cpu_to_le16(conn->handle);
 395                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 396                                                         sizeof(cp), &cp);
 397         }
 398         return 0;
 399 }
 400 EXPORT_SYMBOL(hci_conn_auth);
 401
 402 /* Enable encryption */
 403 int hci_conn_encrypt(struct hci_conn *conn)
 404 {
 405         BT_DBG("conn %p", conn);
 406
 407         if (conn->link_mode & HCI_LM_ENCRYPT)
 408                 return hci_conn_auth(conn);
 409
 410         if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
 411                 return 0;
 412
 413         if (hci_conn_auth(conn)) {
 414                 struct hci_cp_set_conn_encrypt cp;
 415                 cp.handle  = cpu_to_le16(conn->handle);
 416                 cp.encrypt = 1;
 417                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT,
 418                                                         sizeof(cp), &cp);
 419         }
 420         return 0;
 421 }
 422 EXPORT_SYMBOL(hci_conn_encrypt);
 423
 424 /* Change link key */
 425 int hci_conn_change_link_key(struct hci_conn *conn)
 426 {
 427         BT_DBG("conn %p", conn);
 428
 429         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 430                 struct hci_cp_change_conn_link_key cp;
 431                 cp.handle = cpu_to_le16(conn->handle);
 432                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 433                                                         sizeof(cp), &cp);
 434         }
 435         return 0;
 436 }
 437 EXPORT_SYMBOL(hci_conn_change_link_key);
 438
 439 /* Switch role */
 440 int hci_conn_switch_role(struct hci_conn *conn, uint8_t role)
 441 {
 442         BT_DBG("conn %p", conn);
 443
 444         if (!role && conn->link_mode & HCI_LM_MASTER)
 445                 return 1;
 446
 447         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
 448                 struct hci_cp_switch_role cp;
 449                 bacpy(&cp.bdaddr, &conn->dst);
 450                 cp.role = role;
 451                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 452         }
 453         return 0;
 454 }
 455 EXPORT_SYMBOL(hci_conn_switch_role);
 456
 457 /* Enter active mode */
 458 void hci_conn_enter_active_mode(struct hci_conn *conn)
 459 {
 460         struct hci_dev *hdev = conn->hdev;
 461
 462         BT_DBG("conn %p mode %d", conn, conn->mode);
 463
 464         if (test_bit(HCI_RAW, &hdev->flags))
 465                 return;
 466
 467         if (conn->mode != HCI_CM_SNIFF || !conn->power_save)
 468                 goto timer;
 469
 470         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 471                 struct hci_cp_exit_sniff_mode cp;
 472                 cp.handle = cpu_to_le16(conn->handle);
 473                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 474         }
 475
 476 timer:
 477         if (hdev->idle_timeout > 0)
 478                 mod_timer(&conn->idle_timer,
 479                         jiffies + msecs_to_jiffies(hdev->idle_timeout));
 480 }
 481
 482 /* Enter sniff mode */
 483 void hci_conn_enter_sniff_mode(struct hci_conn *conn)
 484 {
 485         struct hci_dev *hdev = conn->hdev;
 486
 487         BT_DBG("conn %p mode %d", conn, conn->mode);
 488
 489         if (test_bit(HCI_RAW, &hdev->flags))
 490                 return;
 491
 492         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 493                 return;
 494
 495         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 496                 return;
 497
 498         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 499                 struct hci_cp_sniff_subrate cp;
 500                 cp.handle             = cpu_to_le16(conn->handle);
 501                 cp.max_latency        = cpu_to_le16(0);
 502                 cp.min_remote_timeout = cpu_to_le16(0);
 503                 cp.min_local_timeout  = cpu_to_le16(0);
 504                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 505         }
 506
 507         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 508                 struct hci_cp_sniff_mode cp;
 509                 cp.handle       = cpu_to_le16(conn->handle);
 510                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 511                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 512                 cp.attempt      = cpu_to_le16(4);
 513                 cp.timeout      = cpu_to_le16(1);
 514                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 515         }
 516 }
 517
 518 /* Drop all connection on the device */
 519 void hci_conn_hash_flush(struct hci_dev *hdev)
 520 {
 521         struct hci_conn_hash *h = &hdev->conn_hash;
 522         struct list_head *p;
 523
 524         BT_DBG("hdev %s", hdev->name);
 525
 526         p = h->list.next;
 527         while (p != &h->list) {
 528                 struct hci_conn *c;
 529
 530                 c = list_entry(p, struct hci_conn, list);
 531                 p = p->next;
 532
 533                 c->state = BT_CLOSED;
 534
 535                 hci_conn_del_sysfs(c);
 536
 537                 hci_proto_disconn_ind(c, 0x16);
 538                 hci_conn_del(c);
 539         }
 540 }
 541
 542 /* Check pending connect attempts */
 543 void hci_conn_check_pending(struct hci_dev *hdev)
 544 {
 545         struct hci_conn *conn;
 546
 547         BT_DBG("hdev %s", hdev->name);
 548
 549         hci_dev_lock(hdev);
 550
 551         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
 552         if (conn)
 553                 hci_acl_connect(conn);
 554
 555         hci_dev_unlock(hdev);
 556 }
 557
 558 int hci_get_conn_list(void __user *arg)
 559 {
 560         struct hci_conn_list_req req, *cl;
 561         struct hci_conn_info *ci;
 562         struct hci_dev *hdev;
 563         struct list_head *p;
 564         int n = 0, size, err;
 565
 566         if (copy_from_user(&req, arg, sizeof(req)))
 567                 return -EFAULT;
 568
 569         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
 570                 return -EINVAL;
 571
 572         size = sizeof(req) + req.conn_num * sizeof(*ci);
 573
 574         if (!(cl = kmalloc(size, GFP_KERNEL)))
 575                 return -ENOMEM;
 576
 577         if (!(hdev = hci_dev_get(req.dev_id))) {
 578                 kfree(cl);
 579                 return -ENODEV;
 580         }
 581
 582         ci = cl->conn_info;
 583
 584         hci_dev_lock_bh(hdev);
 585         list_for_each(p, &hdev->conn_hash.list) {
 586                 register struct hci_conn *c;
 587                 c = list_entry(p, struct hci_conn, list);
 588
 589                 bacpy(&(ci + n)->bdaddr, &c->dst);
 590                 (ci + n)->handle = c->handle;
 591                 (ci + n)->type  = c->type;
 592                 (ci + n)->out   = c->out;
 593                 (ci + n)->state = c->state;
 594                 (ci + n)->link_mode = c->link_mode;
 595                 if (++n >= req.conn_num)
 596                         break;
 597         }
 598         hci_dev_unlock_bh(hdev);
 599
 600         cl->dev_id = hdev->id;
 601         cl->conn_num = n;
 602         size = sizeof(req) + n * sizeof(*ci);
 603
 604         hci_dev_put(hdev);
 605
 606         err = copy_to_user(arg, cl, size);
 607         kfree(cl);
 608
 609         return err ? -EFAULT : 0;
 610 }
 611
 612 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
 613 {
 614         struct hci_conn_info_req req;
 615         struct hci_conn_info ci;
 616         struct hci_conn *conn;
 617         char __user *ptr = arg + sizeof(req);
 618
 619         if (copy_from_user(&req, arg, sizeof(req)))
 620                 return -EFAULT;
 621
 622         hci_dev_lock_bh(hdev);
 623         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
 624         if (conn) {
 625                 bacpy(&ci.bdaddr, &conn->dst);
 626                 ci.handle = conn->handle;
 627                 ci.type  = conn->type;
 628                 ci.out   = conn->out;
 629                 ci.state = conn->state;
 630                 ci.link_mode = conn->link_mode;
 631         }
 632         hci_dev_unlock_bh(hdev);
 633
 634         if (!conn)
 635                 return -ENOENT;
 636
 637         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
 638 }
 639
 640 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
 641 {
 642         struct hci_auth_info_req req;
 643         struct hci_conn *conn;
 644
 645         if (copy_from_user(&req, arg, sizeof(req)))
 646                 return -EFAULT;
 647
 648         hci_dev_lock_bh(hdev);
 649         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
 650         if (conn)
 651                 req.type = conn->auth_type;
 652         hci_dev_unlock_bh(hdev);
 653
 654         if (!conn)
 655                 return -ENOENT;
 656
 657         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
 658 }