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 void hci_acl_connect(struct hci_conn *conn)
  49 {
  50         struct hci_dev *hdev = conn->hdev;
  51         struct inquiry_entry *ie;
  52         struct hci_cp_create_conn cp;
  53
  54         BT_DBG("%p", conn);
  55
  56         conn->state = BT_CONNECT;
  57         conn->out = 1;
  58
  59         conn->link_mode = HCI_LM_MASTER;
  60
  61         conn->attempt++;
  62
  63         conn->link_policy = hdev->link_policy;
  64
  65         memset(&cp, 0, sizeof(cp));
  66         bacpy(&cp.bdaddr, &conn->dst);
  67         cp.pscan_rep_mode = 0x02;
  68
  69         if ((ie = hci_inquiry_cache_lookup(hdev, &conn->dst))) {
  70                 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
  71                         cp.pscan_rep_mode = ie->data.pscan_rep_mode;
  72                         cp.pscan_mode     = ie->data.pscan_mode;
  73                         cp.clock_offset   = ie->data.clock_offset |
  74                                                         cpu_to_le16(0x8000);
  75                 }
  76
  77                 memcpy(conn->dev_class, ie->data.dev_class, 3);
  78                 conn->ssp_mode = ie->data.ssp_mode;
  79         }
  80
  81         cp.pkt_type = cpu_to_le16(conn->pkt_type);
  82         if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
  83                 cp.role_switch = 0x01;
  84         else
  85                 cp.role_switch = 0x00;
  86
  87         hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
  88 }
  89
  90 static void hci_acl_connect_cancel(struct hci_conn *conn)
  91 {
  92         struct hci_cp_create_conn_cancel cp;
  93
  94         BT_DBG("%p", conn);
  95
  96         if (conn->hdev->hci_ver < 2)
  97                 return;
  98
  99         bacpy(&cp.bdaddr, &conn->dst);
 100         hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
 101 }
 102
 103 void hci_acl_disconn(struct hci_conn *conn, __u8 reason)
 104 {
 105         struct hci_cp_disconnect cp;
 106
 107         BT_DBG("%p", conn);
 108
 109         conn->state = BT_DISCONN;
 110
 111         cp.handle = cpu_to_le16(conn->handle);
 112         cp.reason = reason;
 113         hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
 114 }
 115
 116 void hci_add_sco(struct hci_conn *conn, __u16 handle)
 117 {
 118         struct hci_dev *hdev = conn->hdev;
 119         struct hci_cp_add_sco cp;
 120
 121         BT_DBG("%p", conn);
 122
 123         conn->state = BT_CONNECT;
 124         conn->out = 1;
 125
 126         conn->attempt++;
 127
 128         cp.handle   = cpu_to_le16(handle);
 129         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 130
 131         hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 132 }
 133
 134 void hci_setup_sync(struct hci_conn *conn, __u16 handle)
 135 {
 136         struct hci_dev *hdev = conn->hdev;
 137         struct hci_cp_setup_sync_conn cp;
 138
 139         BT_DBG("%p", conn);
 140
 141         conn->state = BT_CONNECT;
 142         conn->out = 1;
 143
 144         conn->attempt++;
 145
 146         cp.handle   = cpu_to_le16(handle);
 147         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 148
 149         cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
 150         cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
 151         cp.max_latency    = cpu_to_le16(0xffff);
 152         cp.voice_setting  = cpu_to_le16(hdev->voice_setting);
 153         cp.retrans_effort = 0xff;
 154
 155         hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp);
 156 }
 157
 158 static void hci_conn_timeout(unsigned long arg)
 159 {
 160         struct hci_conn *conn = (void *) arg;
 161         struct hci_dev *hdev = conn->hdev;
 162         __u8 reason;
 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                 reason = hci_proto_disconn_ind(conn);
 182                 hci_acl_disconn(conn, reason);
 183                 break;
 184         default:
 185                 conn->state = BT_CLOSED;
 186                 break;
 187         }
 188
 189         hci_dev_unlock(hdev);
 190 }
 191
 192 static void hci_conn_idle(unsigned long arg)
 193 {
 194         struct hci_conn *conn = (void *) arg;
 195
 196         BT_DBG("conn %p mode %d", conn, conn->mode);
 197
 198         hci_conn_enter_sniff_mode(conn);
 199 }
 200
 201 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 202 {
 203         struct hci_conn *conn;
 204
 205         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 206
 207         conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
 208         if (!conn)
 209                 return NULL;
 210
 211         bacpy(&conn->dst, dst);
 212         conn->hdev  = hdev;
 213         conn->type  = type;
 214         conn->mode  = HCI_CM_ACTIVE;
 215         conn->state = BT_OPEN;
 216
 217         conn->power_save = 1;
 218         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 219
 220         switch (type) {
 221         case ACL_LINK:
 222                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 223                 break;
 224         case SCO_LINK:
 225                 if (lmp_esco_capable(hdev))
 226                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 227                                         (hdev->esco_type & EDR_ESCO_MASK);
 228                 else
 229                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 230                 break;
 231         case ESCO_LINK:
 232                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 233                 break;
 234         }
 235
 236         skb_queue_head_init(&conn->data_q);
 237
 238         setup_timer(&conn->disc_timer, hci_conn_timeout, (unsigned long)conn);
 239         setup_timer(&conn->idle_timer, hci_conn_idle, (unsigned long)conn);
 240
 241         atomic_set(&conn->refcnt, 0);
 242
 243         hci_dev_hold(hdev);
 244
 245         tasklet_disable(&hdev->tx_task);
 246
 247         hci_conn_hash_add(hdev, conn);
 248         if (hdev->notify)
 249                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 250
 251         tasklet_enable(&hdev->tx_task);
 252
 253         return conn;
 254 }
 255
 256 int hci_conn_del(struct hci_conn *conn)
 257 {
 258         struct hci_dev *hdev = conn->hdev;
 259
 260         BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
 261
 262         del_timer(&conn->idle_timer);
 263
 264         del_timer(&conn->disc_timer);
 265
 266         if (conn->type == ACL_LINK) {
 267                 struct hci_conn *sco = conn->link;
 268                 if (sco)
 269                         sco->link = NULL;
 270
 271                 /* Unacked frames */
 272                 hdev->acl_cnt += conn->sent;
 273         } else {
 274                 struct hci_conn *acl = conn->link;
 275                 if (acl) {
 276                         acl->link = NULL;
 277                         hci_conn_put(acl);
 278                 }
 279         }
 280
 281         tasklet_disable(&hdev->tx_task);
 282
 283         hci_conn_hash_del(hdev, conn);
 284         if (hdev->notify)
 285                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 286
 287         tasklet_enable(&hdev->tx_task);
 288
 289         skb_queue_purge(&conn->data_q);
 290
 291         hci_conn_del_sysfs(conn);
 292
 293         return 0;
 294 }
 295
 296 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
 297 {
 298         int use_src = bacmp(src, BDADDR_ANY);
 299         struct hci_dev *hdev = NULL;
 300         struct list_head *p;
 301
 302         BT_DBG("%s -> %s", batostr(src), batostr(dst));
 303
 304         read_lock_bh(&hci_dev_list_lock);
 305
 306         list_for_each(p, &hci_dev_list) {
 307                 struct hci_dev *d = list_entry(p, struct hci_dev, list);
 308
 309                 if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
 310                         continue;
 311
 312                 /* Simple routing:
 313                  *   No source address - find interface with bdaddr != dst
 314                  *   Source address    - find interface with bdaddr == src
 315                  */
 316
 317                 if (use_src) {
 318                         if (!bacmp(&d->bdaddr, src)) {
 319                                 hdev = d; break;
 320                         }
 321                 } else {
 322                         if (bacmp(&d->bdaddr, dst)) {
 323                                 hdev = d; break;
 324                         }
 325                 }
 326         }
 327
 328         if (hdev)
 329                 hdev = hci_dev_hold(hdev);
 330
 331         read_unlock_bh(&hci_dev_list_lock);
 332         return hdev;
 333 }
 334 EXPORT_SYMBOL(hci_get_route);
 335
 336 /* Create SCO or ACL connection.
 337  * Device _must_ be locked */
 338 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 sec_level, __u8 auth_type)
 339 {
 340         struct hci_conn *acl;
 341         struct hci_conn *sco;
 342
 343         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 344
 345         if (!(acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst))) {
 346                 if (!(acl = hci_conn_add(hdev, ACL_LINK, dst)))
 347                         return NULL;
 348         }
 349
 350         hci_conn_hold(acl);
 351
 352         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
 353                 acl->sec_level = sec_level;
 354                 acl->auth_type = auth_type;
 355                 hci_acl_connect(acl);
 356         }
 357
 358         if (type == ACL_LINK)
 359                 return acl;
 360
 361         if (!(sco = hci_conn_hash_lookup_ba(hdev, type, dst))) {
 362                 if (!(sco = hci_conn_add(hdev, type, dst))) {
 363                         hci_conn_put(acl);
 364                         return NULL;
 365                 }
 366         }
 367
 368         acl->link = sco;
 369         sco->link = acl;
 370
 371         hci_conn_hold(sco);
 372
 373         if (acl->state == BT_CONNECTED &&
 374                         (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 375                 if (lmp_esco_capable(hdev))
 376                         hci_setup_sync(sco, acl->handle);
 377                 else
 378                         hci_add_sco(sco, acl->handle);
 379         }
 380
 381         return sco;
 382 }
 383 EXPORT_SYMBOL(hci_connect);
 384
 385 /* Check link security requirement */
 386 int hci_conn_check_link_mode(struct hci_conn *conn)
 387 {
 388         BT_DBG("conn %p", conn);
 389
 390         if (conn->ssp_mode > 0 && conn->hdev->ssp_mode > 0 &&
 391                                         !(conn->link_mode & HCI_LM_ENCRYPT))
 392                 return 0;
 393
 394         return 1;
 395 }
 396 EXPORT_SYMBOL(hci_conn_check_link_mode);
 397
 398 /* Authenticate remote device */
 399 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 400 {
 401         BT_DBG("conn %p", conn);
 402
 403         if (sec_level > conn->sec_level)
 404                 conn->sec_level = sec_level;
 405         else if (conn->link_mode & HCI_LM_AUTH)
 406                 return 1;
 407
 408         conn->auth_type = auth_type;
 409
 410         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 411                 struct hci_cp_auth_requested cp;
 412                 cp.handle = cpu_to_le16(conn->handle);
 413                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 414                                                         sizeof(cp), &cp);
 415         }
 416
 417         return 0;
 418 }
 419
 420 /* Enable security */
 421 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 422 {
 423         BT_DBG("conn %p", conn);
 424
 425         if (sec_level == BT_SECURITY_SDP)
 426                 return 1;
 427
 428         if (sec_level == BT_SECURITY_LOW &&
 429                                 (!conn->ssp_mode || !conn->hdev->ssp_mode))
 430                 return 1;
 431
 432         if (conn->link_mode & HCI_LM_ENCRYPT)
 433                 return hci_conn_auth(conn, sec_level, auth_type);
 434
 435         if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
 436                 return 0;
 437
 438         if (hci_conn_auth(conn, sec_level, auth_type)) {
 439                 struct hci_cp_set_conn_encrypt cp;
 440                 cp.handle  = cpu_to_le16(conn->handle);
 441                 cp.encrypt = 1;
 442                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT,
 443                                                         sizeof(cp), &cp);
 444         }
 445
 446         return 0;
 447 }
 448 EXPORT_SYMBOL(hci_conn_security);
 449
 450 /* Change link key */
 451 int hci_conn_change_link_key(struct hci_conn *conn)
 452 {
 453         BT_DBG("conn %p", conn);
 454
 455         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 456                 struct hci_cp_change_conn_link_key cp;
 457                 cp.handle = cpu_to_le16(conn->handle);
 458                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 459                                                         sizeof(cp), &cp);
 460         }
 461
 462         return 0;
 463 }
 464 EXPORT_SYMBOL(hci_conn_change_link_key);
 465
 466 /* Switch role */
 467 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
 468 {
 469         BT_DBG("conn %p", conn);
 470
 471         if (!role && conn->link_mode & HCI_LM_MASTER)
 472                 return 1;
 473
 474         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
 475                 struct hci_cp_switch_role cp;
 476                 bacpy(&cp.bdaddr, &conn->dst);
 477                 cp.role = role;
 478                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 479         }
 480
 481         return 0;
 482 }
 483 EXPORT_SYMBOL(hci_conn_switch_role);
 484
 485 /* Enter active mode */
 486 void hci_conn_enter_active_mode(struct hci_conn *conn)
 487 {
 488         struct hci_dev *hdev = conn->hdev;
 489
 490         BT_DBG("conn %p mode %d", conn, conn->mode);
 491
 492         if (test_bit(HCI_RAW, &hdev->flags))
 493                 return;
 494
 495         if (conn->mode != HCI_CM_SNIFF || !conn->power_save)
 496                 goto timer;
 497
 498         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 499                 struct hci_cp_exit_sniff_mode cp;
 500                 cp.handle = cpu_to_le16(conn->handle);
 501                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 502         }
 503
 504 timer:
 505         if (hdev->idle_timeout > 0)
 506                 mod_timer(&conn->idle_timer,
 507                         jiffies + msecs_to_jiffies(hdev->idle_timeout));
 508 }
 509
 510 /* Enter sniff mode */
 511 void hci_conn_enter_sniff_mode(struct hci_conn *conn)
 512 {
 513         struct hci_dev *hdev = conn->hdev;
 514
 515         BT_DBG("conn %p mode %d", conn, conn->mode);
 516
 517         if (test_bit(HCI_RAW, &hdev->flags))
 518                 return;
 519
 520         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 521                 return;
 522
 523         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 524                 return;
 525
 526         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 527                 struct hci_cp_sniff_subrate cp;
 528                 cp.handle             = cpu_to_le16(conn->handle);
 529                 cp.max_latency        = cpu_to_le16(0);
 530                 cp.min_remote_timeout = cpu_to_le16(0);
 531                 cp.min_local_timeout  = cpu_to_le16(0);
 532                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 533         }
 534
 535         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 536                 struct hci_cp_sniff_mode cp;
 537                 cp.handle       = cpu_to_le16(conn->handle);
 538                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 539                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 540                 cp.attempt      = cpu_to_le16(4);
 541                 cp.timeout      = cpu_to_le16(1);
 542                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 543         }
 544 }
 545
 546 /* Drop all connection on the device */
 547 void hci_conn_hash_flush(struct hci_dev *hdev)
 548 {
 549         struct hci_conn_hash *h = &hdev->conn_hash;
 550         struct list_head *p;
 551
 552         BT_DBG("hdev %s", hdev->name);
 553
 554         p = h->list.next;
 555         while (p != &h->list) {
 556                 struct hci_conn *c;
 557
 558                 c = list_entry(p, struct hci_conn, list);
 559                 p = p->next;
 560
 561                 c->state = BT_CLOSED;
 562
 563                 hci_proto_disconn_cfm(c, 0x16);
 564                 hci_conn_del(c);
 565         }
 566 }
 567
 568 /* Check pending connect attempts */
 569 void hci_conn_check_pending(struct hci_dev *hdev)
 570 {
 571         struct hci_conn *conn;
 572
 573         BT_DBG("hdev %s", hdev->name);
 574
 575         hci_dev_lock(hdev);
 576
 577         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
 578         if (conn)
 579                 hci_acl_connect(conn);
 580
 581         hci_dev_unlock(hdev);
 582 }
 583
 584 int hci_get_conn_list(void __user *arg)
 585 {
 586         struct hci_conn_list_req req, *cl;
 587         struct hci_conn_info *ci;
 588         struct hci_dev *hdev;
 589         struct list_head *p;
 590         int n = 0, size, err;
 591
 592         if (copy_from_user(&req, arg, sizeof(req)))
 593                 return -EFAULT;
 594
 595         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
 596                 return -EINVAL;
 597
 598         size = sizeof(req) + req.conn_num * sizeof(*ci);
 599
 600         if (!(cl = kmalloc(size, GFP_KERNEL)))
 601                 return -ENOMEM;
 602
 603         if (!(hdev = hci_dev_get(req.dev_id))) {
 604                 kfree(cl);
 605                 return -ENODEV;
 606         }
 607
 608         ci = cl->conn_info;
 609
 610         hci_dev_lock_bh(hdev);
 611         list_for_each(p, &hdev->conn_hash.list) {
 612                 register struct hci_conn *c;
 613                 c = list_entry(p, struct hci_conn, list);
 614
 615                 bacpy(&(ci + n)->bdaddr, &c->dst);
 616                 (ci + n)->handle = c->handle;
 617                 (ci + n)->type  = c->type;
 618                 (ci + n)->out   = c->out;
 619                 (ci + n)->state = c->state;
 620                 (ci + n)->link_mode = c->link_mode;
 621                 if (++n >= req.conn_num)
 622                         break;
 623         }
 624         hci_dev_unlock_bh(hdev);
 625
 626         cl->dev_id = hdev->id;
 627         cl->conn_num = n;
 628         size = sizeof(req) + n * sizeof(*ci);
 629
 630         hci_dev_put(hdev);
 631
 632         err = copy_to_user(arg, cl, size);
 633         kfree(cl);
 634
 635         return err ? -EFAULT : 0;
 636 }
 637
 638 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
 639 {
 640         struct hci_conn_info_req req;
 641         struct hci_conn_info ci;
 642         struct hci_conn *conn;
 643         char __user *ptr = arg + sizeof(req);
 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, req.type, &req.bdaddr);
 650         if (conn) {
 651                 bacpy(&ci.bdaddr, &conn->dst);
 652                 ci.handle = conn->handle;
 653                 ci.type  = conn->type;
 654                 ci.out   = conn->out;
 655                 ci.state = conn->state;
 656                 ci.link_mode = conn->link_mode;
 657         }
 658         hci_dev_unlock_bh(hdev);
 659
 660         if (!conn)
 661                 return -ENOENT;
 662
 663         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
 664 }
 665
 666 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
 667 {
 668         struct hci_auth_info_req req;
 669         struct hci_conn *conn;
 670
 671         if (copy_from_user(&req, arg, sizeof(req)))
 672                 return -EFAULT;
 673
 674         hci_dev_lock_bh(hdev);
 675         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
 676         if (conn)
 677                 req.type = conn->auth_type;
 678         hci_dev_unlock_bh(hdev);
 679
 680         if (!conn)
 681                 return -ENOENT;
 682
 683         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
 684 }