net/bluetooth/hci_conn.c

   1 /*
   2    BlueZ - Bluetooth protocol stack for Linux
   3    Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
   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 /* Device _must_ be locked */
 159 void hci_sco_setup(struct hci_conn *conn, __u8 status)
 160 {
 161         struct hci_conn *sco = conn->link;
 162
 163         BT_DBG("%p", conn);
 164
 165         if (!sco)
 166                 return;
 167
 168         if (!status) {
 169                 if (lmp_esco_capable(conn->hdev))
 170                         hci_setup_sync(sco, conn->handle);
 171                 else
 172                         hci_add_sco(sco, conn->handle);
 173         } else {
 174                 hci_proto_connect_cfm(sco, status);
 175                 hci_conn_del(sco);
 176         }
 177 }
 178
 179 static void hci_conn_timeout(unsigned long arg)
 180 {
 181         struct hci_conn *conn = (void *) arg;
 182         struct hci_dev *hdev = conn->hdev;
 183         __u8 reason;
 184
 185         BT_DBG("conn %p state %d", conn, conn->state);
 186
 187         if (atomic_read(&conn->refcnt))
 188                 return;
 189
 190         hci_dev_lock(hdev);
 191
 192         switch (conn->state) {
 193         case BT_CONNECT:
 194         case BT_CONNECT2:
 195                 if (conn->type == ACL_LINK && conn->out)
 196                         hci_acl_connect_cancel(conn);
 197                 break;
 198         case BT_CONFIG:
 199         case BT_CONNECTED:
 200                 reason = hci_proto_disconn_ind(conn);
 201                 hci_acl_disconn(conn, reason);
 202                 break;
 203         default:
 204                 conn->state = BT_CLOSED;
 205                 break;
 206         }
 207
 208         hci_dev_unlock(hdev);
 209 }
 210
 211 static void hci_conn_idle(unsigned long arg)
 212 {
 213         struct hci_conn *conn = (void *) arg;
 214
 215         BT_DBG("conn %p mode %d", conn, conn->mode);
 216
 217         hci_conn_enter_sniff_mode(conn);
 218 }
 219
 220 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 221 {
 222         struct hci_conn *conn;
 223
 224         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 225
 226         conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
 227         if (!conn)
 228                 return NULL;
 229
 230         bacpy(&conn->dst, dst);
 231         conn->hdev  = hdev;
 232         conn->type  = type;
 233         conn->mode  = HCI_CM_ACTIVE;
 234         conn->state = BT_OPEN;
 235         conn->auth_type = HCI_AT_GENERAL_BONDING;
 236
 237         conn->power_save = 1;
 238         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 239
 240         switch (type) {
 241         case ACL_LINK:
 242                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 243                 break;
 244         case SCO_LINK:
 245                 if (lmp_esco_capable(hdev))
 246                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 247                                         (hdev->esco_type & EDR_ESCO_MASK);
 248                 else
 249                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 250                 break;
 251         case ESCO_LINK:
 252                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 253                 break;
 254         }
 255
 256         skb_queue_head_init(&conn->data_q);
 257
 258         setup_timer(&conn->disc_timer, hci_conn_timeout, (unsigned long)conn);
 259         setup_timer(&conn->idle_timer, hci_conn_idle, (unsigned long)conn);
 260
 261         atomic_set(&conn->refcnt, 0);
 262
 263         hci_dev_hold(hdev);
 264
 265         tasklet_disable(&hdev->tx_task);
 266
 267         hci_conn_hash_add(hdev, conn);
 268         if (hdev->notify)
 269                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 270
 271         atomic_set(&conn->devref, 0);
 272
 273         hci_conn_init_sysfs(conn);
 274
 275         tasklet_enable(&hdev->tx_task);
 276
 277         return conn;
 278 }
 279
 280 int hci_conn_del(struct hci_conn *conn)
 281 {
 282         struct hci_dev *hdev = conn->hdev;
 283
 284         BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
 285
 286         del_timer(&conn->idle_timer);
 287
 288         del_timer(&conn->disc_timer);
 289
 290         if (conn->type == ACL_LINK) {
 291                 struct hci_conn *sco = conn->link;
 292                 if (sco)
 293                         sco->link = NULL;
 294
 295                 /* Unacked frames */
 296                 hdev->acl_cnt += conn->sent;
 297         } else {
 298                 struct hci_conn *acl = conn->link;
 299                 if (acl) {
 300                         acl->link = NULL;
 301                         hci_conn_put(acl);
 302                 }
 303         }
 304
 305         tasklet_disable(&hdev->tx_task);
 306
 307         hci_conn_hash_del(hdev, conn);
 308         if (hdev->notify)
 309                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 310
 311         tasklet_enable(&hdev->tx_task);
 312
 313         skb_queue_purge(&conn->data_q);
 314
 315         hci_conn_put_device(conn);
 316
 317         hci_dev_put(hdev);
 318
 319         return 0;
 320 }
 321
 322 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
 323 {
 324         int use_src = bacmp(src, BDADDR_ANY);
 325         struct hci_dev *hdev = NULL;
 326         struct list_head *p;
 327
 328         BT_DBG("%s -> %s", batostr(src), batostr(dst));
 329
 330         read_lock_bh(&hci_dev_list_lock);
 331
 332         list_for_each(p, &hci_dev_list) {
 333                 struct hci_dev *d = list_entry(p, struct hci_dev, list);
 334
 335                 if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
 336                         continue;
 337
 338                 /* Simple routing:
 339                  *   No source address - find interface with bdaddr != dst
 340                  *   Source address    - find interface with bdaddr == src
 341                  */
 342
 343                 if (use_src) {
 344                         if (!bacmp(&d->bdaddr, src)) {
 345                                 hdev = d; break;
 346                         }
 347                 } else {
 348                         if (bacmp(&d->bdaddr, dst)) {
 349                                 hdev = d; break;
 350                         }
 351                 }
 352         }
 353
 354         if (hdev)
 355                 hdev = hci_dev_hold(hdev);
 356
 357         read_unlock_bh(&hci_dev_list_lock);
 358         return hdev;
 359 }
 360 EXPORT_SYMBOL(hci_get_route);
 361
 362 /* Create SCO or ACL connection.
 363  * Device _must_ be locked */
 364 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 sec_level, __u8 auth_type)
 365 {
 366         struct hci_conn *acl;
 367         struct hci_conn *sco;
 368
 369         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 370
 371         if (!(acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst))) {
 372                 if (!(acl = hci_conn_add(hdev, ACL_LINK, dst)))
 373                         return NULL;
 374         }
 375
 376         hci_conn_hold(acl);
 377
 378         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
 379                 acl->sec_level = sec_level;
 380                 acl->auth_type = auth_type;
 381                 hci_acl_connect(acl);
 382         } else {
 383                 if (acl->sec_level < sec_level)
 384                         acl->sec_level = sec_level;
 385                 if (acl->auth_type < auth_type)
 386                         acl->auth_type = auth_type;
 387         }
 388
 389         if (type == ACL_LINK)
 390                 return acl;
 391
 392         if (!(sco = hci_conn_hash_lookup_ba(hdev, type, dst))) {
 393                 if (!(sco = hci_conn_add(hdev, type, dst))) {
 394                         hci_conn_put(acl);
 395                         return NULL;
 396                 }
 397         }
 398
 399         acl->link = sco;
 400         sco->link = acl;
 401
 402         hci_conn_hold(sco);
 403
 404         if (acl->state == BT_CONNECTED &&
 405                         (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 406                 acl->power_save = 1;
 407                 hci_conn_enter_active_mode(acl);
 408
 409                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->pend)) {
 410                         /* defer SCO setup until mode change completed */
 411                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->pend);
 412                         return sco;
 413                 }
 414
 415                 hci_sco_setup(acl, 0x00);
 416         }
 417
 418         return sco;
 419 }
 420 EXPORT_SYMBOL(hci_connect);
 421
 422 /* Check link security requirement */
 423 int hci_conn_check_link_mode(struct hci_conn *conn)
 424 {
 425         BT_DBG("conn %p", conn);
 426
 427         if (conn->ssp_mode > 0 && conn->hdev->ssp_mode > 0 &&
 428                                         !(conn->link_mode & HCI_LM_ENCRYPT))
 429                 return 0;
 430
 431         return 1;
 432 }
 433 EXPORT_SYMBOL(hci_conn_check_link_mode);
 434
 435 /* Authenticate remote device */
 436 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 437 {
 438         BT_DBG("conn %p", conn);
 439
 440         if (sec_level > conn->sec_level)
 441                 conn->sec_level = sec_level;
 442         else if (conn->link_mode & HCI_LM_AUTH)
 443                 return 1;
 444
 445         conn->auth_type = auth_type;
 446
 447         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 448                 struct hci_cp_auth_requested cp;
 449                 cp.handle = cpu_to_le16(conn->handle);
 450                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 451                                                         sizeof(cp), &cp);
 452         }
 453
 454         return 0;
 455 }
 456
 457 /* Enable security */
 458 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 459 {
 460         BT_DBG("conn %p", conn);
 461
 462         if (sec_level == BT_SECURITY_SDP)
 463                 return 1;
 464
 465         if (sec_level == BT_SECURITY_LOW &&
 466                                 (!conn->ssp_mode || !conn->hdev->ssp_mode))
 467                 return 1;
 468
 469         if (conn->link_mode & HCI_LM_ENCRYPT)
 470                 return hci_conn_auth(conn, sec_level, auth_type);
 471
 472         if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
 473                 return 0;
 474
 475         if (hci_conn_auth(conn, sec_level, auth_type)) {
 476                 struct hci_cp_set_conn_encrypt cp;
 477                 cp.handle  = cpu_to_le16(conn->handle);
 478                 cp.encrypt = 1;
 479                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT,
 480                                                         sizeof(cp), &cp);
 481         }
 482
 483         return 0;
 484 }
 485 EXPORT_SYMBOL(hci_conn_security);
 486
 487 /* Change link key */
 488 int hci_conn_change_link_key(struct hci_conn *conn)
 489 {
 490         BT_DBG("conn %p", conn);
 491
 492         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 493                 struct hci_cp_change_conn_link_key cp;
 494                 cp.handle = cpu_to_le16(conn->handle);
 495                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 496                                                         sizeof(cp), &cp);
 497         }
 498
 499         return 0;
 500 }
 501 EXPORT_SYMBOL(hci_conn_change_link_key);
 502
 503 /* Switch role */
 504 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
 505 {
 506         BT_DBG("conn %p", conn);
 507
 508         if (!role && conn->link_mode & HCI_LM_MASTER)
 509                 return 1;
 510
 511         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
 512                 struct hci_cp_switch_role cp;
 513                 bacpy(&cp.bdaddr, &conn->dst);
 514                 cp.role = role;
 515                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 516         }
 517
 518         return 0;
 519 }
 520 EXPORT_SYMBOL(hci_conn_switch_role);
 521
 522 /* Enter active mode */
 523 void hci_conn_enter_active_mode(struct hci_conn *conn)
 524 {
 525         struct hci_dev *hdev = conn->hdev;
 526
 527         BT_DBG("conn %p mode %d", conn, conn->mode);
 528
 529         if (test_bit(HCI_RAW, &hdev->flags))
 530                 return;
 531
 532         if (conn->mode != HCI_CM_SNIFF || !conn->power_save)
 533                 goto timer;
 534
 535         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 536                 struct hci_cp_exit_sniff_mode cp;
 537                 cp.handle = cpu_to_le16(conn->handle);
 538                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 539         }
 540
 541 timer:
 542         if (hdev->idle_timeout > 0)
 543                 mod_timer(&conn->idle_timer,
 544                         jiffies + msecs_to_jiffies(hdev->idle_timeout));
 545 }
 546
 547 /* Enter sniff mode */
 548 void hci_conn_enter_sniff_mode(struct hci_conn *conn)
 549 {
 550         struct hci_dev *hdev = conn->hdev;
 551
 552         BT_DBG("conn %p mode %d", conn, conn->mode);
 553
 554         if (test_bit(HCI_RAW, &hdev->flags))
 555                 return;
 556
 557         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 558                 return;
 559
 560         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 561                 return;
 562
 563         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 564                 struct hci_cp_sniff_subrate cp;
 565                 cp.handle             = cpu_to_le16(conn->handle);
 566                 cp.max_latency        = cpu_to_le16(0);
 567                 cp.min_remote_timeout = cpu_to_le16(0);
 568                 cp.min_local_timeout  = cpu_to_le16(0);
 569                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 570         }
 571
 572         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 573                 struct hci_cp_sniff_mode cp;
 574                 cp.handle       = cpu_to_le16(conn->handle);
 575                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 576                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 577                 cp.attempt      = cpu_to_le16(4);
 578                 cp.timeout      = cpu_to_le16(1);
 579                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 580         }
 581 }
 582
 583 /* Drop all connection on the device */
 584 void hci_conn_hash_flush(struct hci_dev *hdev)
 585 {
 586         struct hci_conn_hash *h = &hdev->conn_hash;
 587         struct list_head *p;
 588
 589         BT_DBG("hdev %s", hdev->name);
 590
 591         p = h->list.next;
 592         while (p != &h->list) {
 593                 struct hci_conn *c;
 594
 595                 c = list_entry(p, struct hci_conn, list);
 596                 p = p->next;
 597
 598                 c->state = BT_CLOSED;
 599
 600                 hci_proto_disconn_cfm(c, 0x16);
 601                 hci_conn_del(c);
 602         }
 603 }
 604
 605 /* Check pending connect attempts */
 606 void hci_conn_check_pending(struct hci_dev *hdev)
 607 {
 608         struct hci_conn *conn;
 609
 610         BT_DBG("hdev %s", hdev->name);
 611
 612         hci_dev_lock(hdev);
 613
 614         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
 615         if (conn)
 616                 hci_acl_connect(conn);
 617
 618         hci_dev_unlock(hdev);
 619 }
 620
 621 void hci_conn_hold_device(struct hci_conn *conn)
 622 {
 623         atomic_inc(&conn->devref);
 624 }
 625 EXPORT_SYMBOL(hci_conn_hold_device);
 626
 627 void hci_conn_put_device(struct hci_conn *conn)
 628 {
 629         if (atomic_dec_and_test(&conn->devref))
 630                 hci_conn_del_sysfs(conn);
 631 }
 632 EXPORT_SYMBOL(hci_conn_put_device);
 633
 634 int hci_get_conn_list(void __user *arg)
 635 {
 636         struct hci_conn_list_req req, *cl;
 637         struct hci_conn_info *ci;
 638         struct hci_dev *hdev;
 639         struct list_head *p;
 640         int n = 0, size, err;
 641
 642         if (copy_from_user(&req, arg, sizeof(req)))
 643                 return -EFAULT;
 644
 645         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
 646                 return -EINVAL;
 647
 648         size = sizeof(req) + req.conn_num * sizeof(*ci);
 649
 650         if (!(cl = kmalloc(size, GFP_KERNEL)))
 651                 return -ENOMEM;
 652
 653         if (!(hdev = hci_dev_get(req.dev_id))) {
 654                 kfree(cl);
 655                 return -ENODEV;
 656         }
 657
 658         ci = cl->conn_info;
 659
 660         hci_dev_lock_bh(hdev);
 661         list_for_each(p, &hdev->conn_hash.list) {
 662                 register struct hci_conn *c;
 663                 c = list_entry(p, struct hci_conn, list);
 664
 665                 bacpy(&(ci + n)->bdaddr, &c->dst);
 666                 (ci + n)->handle = c->handle;
 667                 (ci + n)->type  = c->type;
 668                 (ci + n)->out   = c->out;
 669                 (ci + n)->state = c->state;
 670                 (ci + n)->link_mode = c->link_mode;
 671                 if (++n >= req.conn_num)
 672                         break;
 673         }
 674         hci_dev_unlock_bh(hdev);
 675
 676         cl->dev_id = hdev->id;
 677         cl->conn_num = n;
 678         size = sizeof(req) + n * sizeof(*ci);
 679
 680         hci_dev_put(hdev);
 681
 682         err = copy_to_user(arg, cl, size);
 683         kfree(cl);
 684
 685         return err ? -EFAULT : 0;
 686 }
 687
 688 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
 689 {
 690         struct hci_conn_info_req req;
 691         struct hci_conn_info ci;
 692         struct hci_conn *conn;
 693         char __user *ptr = arg + sizeof(req);
 694
 695         if (copy_from_user(&req, arg, sizeof(req)))
 696                 return -EFAULT;
 697
 698         hci_dev_lock_bh(hdev);
 699         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
 700         if (conn) {
 701                 bacpy(&ci.bdaddr, &conn->dst);
 702                 ci.handle = conn->handle;
 703                 ci.type  = conn->type;
 704                 ci.out   = conn->out;
 705                 ci.state = conn->state;
 706                 ci.link_mode = conn->link_mode;
 707         }
 708         hci_dev_unlock_bh(hdev);
 709
 710         if (!conn)
 711                 return -ENOENT;
 712
 713         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
 714 }
 715
 716 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
 717 {
 718         struct hci_auth_info_req req;
 719         struct hci_conn *conn;
 720
 721         if (copy_from_user(&req, arg, sizeof(req)))
 722                 return -EFAULT;
 723
 724         hci_dev_lock_bh(hdev);
 725         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
 726         if (conn)
 727                 req.type = conn->auth_type;
 728         hci_dev_unlock_bh(hdev);
 729
 730         if (!conn)
 731                 return -ENOENT;
 732
 733         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
 734 }