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 <linux/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         ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
  70         if (ie) {
  71                 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
  72                         cp.pscan_rep_mode = ie->data.pscan_rep_mode;
  73                         cp.pscan_mode     = ie->data.pscan_mode;
  74                         cp.clock_offset   = ie->data.clock_offset |
  75                                                         cpu_to_le16(0x8000);
  76                 }
  77
  78                 memcpy(conn->dev_class, ie->data.dev_class, 3);
  79                 conn->ssp_mode = ie->data.ssp_mode;
  80         }
  81
  82         cp.pkt_type = cpu_to_le16(conn->pkt_type);
  83         if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
  84                 cp.role_switch = 0x01;
  85         else
  86                 cp.role_switch = 0x00;
  87
  88         hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
  89 }
  90
  91 static void hci_acl_connect_cancel(struct hci_conn *conn)
  92 {
  93         struct hci_cp_create_conn_cancel cp;
  94
  95         BT_DBG("%p", conn);
  96
  97         if (conn->hdev->hci_ver < 2)
  98                 return;
  99
 100         bacpy(&cp.bdaddr, &conn->dst);
 101         hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
 102 }
 103
 104 void hci_acl_disconn(struct hci_conn *conn, __u8 reason)
 105 {
 106         struct hci_cp_disconnect cp;
 107
 108         BT_DBG("%p", conn);
 109
 110         conn->state = BT_DISCONN;
 111
 112         cp.handle = cpu_to_le16(conn->handle);
 113         cp.reason = reason;
 114         hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
 115 }
 116
 117 void hci_add_sco(struct hci_conn *conn, __u16 handle)
 118 {
 119         struct hci_dev *hdev = conn->hdev;
 120         struct hci_cp_add_sco cp;
 121
 122         BT_DBG("%p", conn);
 123
 124         conn->state = BT_CONNECT;
 125         conn->out = 1;
 126
 127         conn->attempt++;
 128
 129         cp.handle   = cpu_to_le16(handle);
 130         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 131
 132         hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 133 }
 134
 135 void hci_setup_sync(struct hci_conn *conn, __u16 handle)
 136 {
 137         struct hci_dev *hdev = conn->hdev;
 138         struct hci_cp_setup_sync_conn cp;
 139
 140         BT_DBG("%p", conn);
 141
 142         conn->state = BT_CONNECT;
 143         conn->out = 1;
 144
 145         conn->attempt++;
 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 /* Device _must_ be locked */
 160 void hci_sco_setup(struct hci_conn *conn, __u8 status)
 161 {
 162         struct hci_conn *sco = conn->link;
 163
 164         BT_DBG("%p", conn);
 165
 166         if (!sco)
 167                 return;
 168
 169         if (!status) {
 170                 if (lmp_esco_capable(conn->hdev))
 171                         hci_setup_sync(sco, conn->handle);
 172                 else
 173                         hci_add_sco(sco, conn->handle);
 174         } else {
 175                 hci_proto_connect_cfm(sco, status);
 176                 hci_conn_del(sco);
 177         }
 178 }
 179
 180 static void hci_conn_timeout(unsigned long arg)
 181 {
 182         struct hci_conn *conn = (void *) arg;
 183         struct hci_dev *hdev = conn->hdev;
 184         __u8 reason;
 185
 186         BT_DBG("conn %p state %d", conn, conn->state);
 187
 188         if (atomic_read(&conn->refcnt))
 189                 return;
 190
 191         hci_dev_lock(hdev);
 192
 193         switch (conn->state) {
 194         case BT_CONNECT:
 195         case BT_CONNECT2:
 196                 if (conn->type == ACL_LINK && conn->out)
 197                         hci_acl_connect_cancel(conn);
 198                 break;
 199         case BT_CONFIG:
 200         case BT_CONNECTED:
 201                 reason = hci_proto_disconn_ind(conn);
 202                 hci_acl_disconn(conn, reason);
 203                 break;
 204         default:
 205                 conn->state = BT_CLOSED;
 206                 break;
 207         }
 208
 209         hci_dev_unlock(hdev);
 210 }
 211
 212 static void hci_conn_idle(unsigned long arg)
 213 {
 214         struct hci_conn *conn = (void *) arg;
 215
 216         BT_DBG("conn %p mode %d", conn, conn->mode);
 217
 218         hci_conn_enter_sniff_mode(conn);
 219 }
 220
 221 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 222 {
 223         struct hci_conn *conn;
 224
 225         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 226
 227         conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
 228         if (!conn)
 229                 return NULL;
 230
 231         bacpy(&conn->dst, dst);
 232         conn->hdev  = hdev;
 233         conn->type  = type;
 234         conn->mode  = HCI_CM_ACTIVE;
 235         conn->state = BT_OPEN;
 236         conn->auth_type = HCI_AT_GENERAL_BONDING;
 237
 238         conn->power_save = 1;
 239         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 240
 241         switch (type) {
 242         case ACL_LINK:
 243                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 244                 break;
 245         case SCO_LINK:
 246                 if (lmp_esco_capable(hdev))
 247                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 248                                         (hdev->esco_type & EDR_ESCO_MASK);
 249                 else
 250                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 251                 break;
 252         case ESCO_LINK:
 253                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 254                 break;
 255         }
 256
 257         skb_queue_head_init(&conn->data_q);
 258
 259         setup_timer(&conn->disc_timer, hci_conn_timeout, (unsigned long)conn);
 260         setup_timer(&conn->idle_timer, hci_conn_idle, (unsigned long)conn);
 261
 262         atomic_set(&conn->refcnt, 0);
 263
 264         hci_dev_hold(hdev);
 265
 266         tasklet_disable(&hdev->tx_task);
 267
 268         hci_conn_hash_add(hdev, conn);
 269         if (hdev->notify)
 270                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 271
 272         atomic_set(&conn->devref, 0);
 273
 274         hci_conn_init_sysfs(conn);
 275
 276         tasklet_enable(&hdev->tx_task);
 277
 278         return conn;
 279 }
 280
 281 int hci_conn_del(struct hci_conn *conn)
 282 {
 283         struct hci_dev *hdev = conn->hdev;
 284
 285         BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
 286
 287         del_timer(&conn->idle_timer);
 288
 289         del_timer(&conn->disc_timer);
 290
 291         if (conn->type == ACL_LINK) {
 292                 struct hci_conn *sco = conn->link;
 293                 if (sco)
 294                         sco->link = NULL;
 295
 296                 /* Unacked frames */
 297                 hdev->acl_cnt += conn->sent;
 298         } else {
 299                 struct hci_conn *acl = conn->link;
 300                 if (acl) {
 301                         acl->link = NULL;
 302                         hci_conn_put(acl);
 303                 }
 304         }
 305
 306         tasklet_disable(&hdev->tx_task);
 307
 308         hci_conn_hash_del(hdev, conn);
 309         if (hdev->notify)
 310                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 311
 312         tasklet_enable(&hdev->tx_task);
 313
 314         skb_queue_purge(&conn->data_q);
 315
 316         hci_conn_put_device(conn);
 317
 318         hci_dev_put(hdev);
 319
 320         return 0;
 321 }
 322
 323 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
 324 {
 325         int use_src = bacmp(src, BDADDR_ANY);
 326         struct hci_dev *hdev = NULL;
 327         struct list_head *p;
 328
 329         BT_DBG("%s -> %s", batostr(src), batostr(dst));
 330
 331         read_lock_bh(&hci_dev_list_lock);
 332
 333         list_for_each(p, &hci_dev_list) {
 334                 struct hci_dev *d = list_entry(p, struct hci_dev, list);
 335
 336                 if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
 337                         continue;
 338
 339                 /* Simple routing:
 340                  *   No source address - find interface with bdaddr != dst
 341                  *   Source address    - find interface with bdaddr == src
 342                  */
 343
 344                 if (use_src) {
 345                         if (!bacmp(&d->bdaddr, src)) {
 346                                 hdev = d; break;
 347                         }
 348                 } else {
 349                         if (bacmp(&d->bdaddr, dst)) {
 350                                 hdev = d; break;
 351                         }
 352                 }
 353         }
 354
 355         if (hdev)
 356                 hdev = hci_dev_hold(hdev);
 357
 358         read_unlock_bh(&hci_dev_list_lock);
 359         return hdev;
 360 }
 361 EXPORT_SYMBOL(hci_get_route);
 362
 363 /* Create SCO or ACL connection.
 364  * Device _must_ be locked */
 365 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 sec_level, __u8 auth_type)
 366 {
 367         struct hci_conn *acl;
 368         struct hci_conn *sco;
 369
 370         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 371
 372         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
 373         if (!acl) {
 374                 acl = hci_conn_add(hdev, ACL_LINK, dst);
 375                 if (!acl)
 376                         return NULL;
 377         }
 378
 379         hci_conn_hold(acl);
 380
 381         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
 382                 acl->sec_level = sec_level;
 383                 acl->auth_type = auth_type;
 384                 hci_acl_connect(acl);
 385         } else {
 386                 if (acl->sec_level < sec_level)
 387                         acl->sec_level = sec_level;
 388                 if (acl->auth_type < auth_type)
 389                         acl->auth_type = auth_type;
 390         }
 391
 392         if (type == ACL_LINK)
 393                 return acl;
 394
 395         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
 396         if (!sco) {
 397                 sco = hci_conn_add(hdev, type, dst);
 398                 if (!sco) {
 399                         hci_conn_put(acl);
 400                         return NULL;
 401                 }
 402         }
 403
 404         acl->link = sco;
 405         sco->link = acl;
 406
 407         hci_conn_hold(sco);
 408
 409         if (acl->state == BT_CONNECTED &&
 410                         (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 411                 acl->power_save = 1;
 412                 hci_conn_enter_active_mode(acl);
 413
 414                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->pend)) {
 415                         /* defer SCO setup until mode change completed */
 416                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->pend);
 417                         return sco;
 418                 }
 419
 420                 hci_sco_setup(acl, 0x00);
 421         }
 422
 423         return sco;
 424 }
 425 EXPORT_SYMBOL(hci_connect);
 426
 427 /* Check link security requirement */
 428 int hci_conn_check_link_mode(struct hci_conn *conn)
 429 {
 430         BT_DBG("conn %p", conn);
 431
 432         if (conn->ssp_mode > 0 && conn->hdev->ssp_mode > 0 &&
 433                                         !(conn->link_mode & HCI_LM_ENCRYPT))
 434                 return 0;
 435
 436         return 1;
 437 }
 438 EXPORT_SYMBOL(hci_conn_check_link_mode);
 439
 440 /* Authenticate remote device */
 441 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 442 {
 443         BT_DBG("conn %p", conn);
 444
 445         if (sec_level > conn->sec_level)
 446                 conn->sec_level = sec_level;
 447         else if (conn->link_mode & HCI_LM_AUTH)
 448                 return 1;
 449
 450         conn->auth_type = auth_type;
 451
 452         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 453                 struct hci_cp_auth_requested cp;
 454                 cp.handle = cpu_to_le16(conn->handle);
 455                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 456                                                         sizeof(cp), &cp);
 457         }
 458
 459         return 0;
 460 }
 461
 462 /* Enable security */
 463 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 464 {
 465         BT_DBG("conn %p", conn);
 466
 467         if (sec_level == BT_SECURITY_SDP)
 468                 return 1;
 469
 470         if (sec_level == BT_SECURITY_LOW &&
 471                                 (!conn->ssp_mode || !conn->hdev->ssp_mode))
 472                 return 1;
 473
 474         if (conn->link_mode & HCI_LM_ENCRYPT)
 475                 return hci_conn_auth(conn, sec_level, auth_type);
 476
 477         if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
 478                 return 0;
 479
 480         if (hci_conn_auth(conn, sec_level, auth_type)) {
 481                 struct hci_cp_set_conn_encrypt cp;
 482                 cp.handle  = cpu_to_le16(conn->handle);
 483                 cp.encrypt = 1;
 484                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT,
 485                                                         sizeof(cp), &cp);
 486         }
 487
 488         return 0;
 489 }
 490 EXPORT_SYMBOL(hci_conn_security);
 491
 492 /* Change link key */
 493 int hci_conn_change_link_key(struct hci_conn *conn)
 494 {
 495         BT_DBG("conn %p", conn);
 496
 497         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 498                 struct hci_cp_change_conn_link_key cp;
 499                 cp.handle = cpu_to_le16(conn->handle);
 500                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 501                                                         sizeof(cp), &cp);
 502         }
 503
 504         return 0;
 505 }
 506 EXPORT_SYMBOL(hci_conn_change_link_key);
 507
 508 /* Switch role */
 509 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
 510 {
 511         BT_DBG("conn %p", conn);
 512
 513         if (!role && conn->link_mode & HCI_LM_MASTER)
 514                 return 1;
 515
 516         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
 517                 struct hci_cp_switch_role cp;
 518                 bacpy(&cp.bdaddr, &conn->dst);
 519                 cp.role = role;
 520                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 521         }
 522
 523         return 0;
 524 }
 525 EXPORT_SYMBOL(hci_conn_switch_role);
 526
 527 /* Enter active mode */
 528 void hci_conn_enter_active_mode(struct hci_conn *conn)
 529 {
 530         struct hci_dev *hdev = conn->hdev;
 531
 532         BT_DBG("conn %p mode %d", conn, conn->mode);
 533
 534         if (test_bit(HCI_RAW, &hdev->flags))
 535                 return;
 536
 537         if (conn->mode != HCI_CM_SNIFF || !conn->power_save)
 538                 goto timer;
 539
 540         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 541                 struct hci_cp_exit_sniff_mode cp;
 542                 cp.handle = cpu_to_le16(conn->handle);
 543                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 544         }
 545
 546 timer:
 547         if (hdev->idle_timeout > 0)
 548                 mod_timer(&conn->idle_timer,
 549                         jiffies + msecs_to_jiffies(hdev->idle_timeout));
 550 }
 551
 552 /* Enter sniff mode */
 553 void hci_conn_enter_sniff_mode(struct hci_conn *conn)
 554 {
 555         struct hci_dev *hdev = conn->hdev;
 556
 557         BT_DBG("conn %p mode %d", conn, conn->mode);
 558
 559         if (test_bit(HCI_RAW, &hdev->flags))
 560                 return;
 561
 562         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 563                 return;
 564
 565         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 566                 return;
 567
 568         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 569                 struct hci_cp_sniff_subrate cp;
 570                 cp.handle             = cpu_to_le16(conn->handle);
 571                 cp.max_latency        = cpu_to_le16(0);
 572                 cp.min_remote_timeout = cpu_to_le16(0);
 573                 cp.min_local_timeout  = cpu_to_le16(0);
 574                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 575         }
 576
 577         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 578                 struct hci_cp_sniff_mode cp;
 579                 cp.handle       = cpu_to_le16(conn->handle);
 580                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 581                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 582                 cp.attempt      = cpu_to_le16(4);
 583                 cp.timeout      = cpu_to_le16(1);
 584                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 585         }
 586 }
 587
 588 /* Drop all connection on the device */
 589 void hci_conn_hash_flush(struct hci_dev *hdev)
 590 {
 591         struct hci_conn_hash *h = &hdev->conn_hash;
 592         struct list_head *p;
 593
 594         BT_DBG("hdev %s", hdev->name);
 595
 596         p = h->list.next;
 597         while (p != &h->list) {
 598                 struct hci_conn *c;
 599
 600                 c = list_entry(p, struct hci_conn, list);
 601                 p = p->next;
 602
 603                 c->state = BT_CLOSED;
 604
 605                 hci_proto_disconn_cfm(c, 0x16);
 606                 hci_conn_del(c);
 607         }
 608 }
 609
 610 /* Check pending connect attempts */
 611 void hci_conn_check_pending(struct hci_dev *hdev)
 612 {
 613         struct hci_conn *conn;
 614
 615         BT_DBG("hdev %s", hdev->name);
 616
 617         hci_dev_lock(hdev);
 618
 619         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
 620         if (conn)
 621                 hci_acl_connect(conn);
 622
 623         hci_dev_unlock(hdev);
 624 }
 625
 626 void hci_conn_hold_device(struct hci_conn *conn)
 627 {
 628         atomic_inc(&conn->devref);
 629 }
 630 EXPORT_SYMBOL(hci_conn_hold_device);
 631
 632 void hci_conn_put_device(struct hci_conn *conn)
 633 {
 634         if (atomic_dec_and_test(&conn->devref))
 635                 hci_conn_del_sysfs(conn);
 636 }
 637 EXPORT_SYMBOL(hci_conn_put_device);
 638
 639 int hci_get_conn_list(void __user *arg)
 640 {
 641         struct hci_conn_list_req req, *cl;
 642         struct hci_conn_info *ci;
 643         struct hci_dev *hdev;
 644         struct list_head *p;
 645         int n = 0, size, err;
 646
 647         if (copy_from_user(&req, arg, sizeof(req)))
 648                 return -EFAULT;
 649
 650         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
 651                 return -EINVAL;
 652
 653         size = sizeof(req) + req.conn_num * sizeof(*ci);
 654
 655         cl = kmalloc(size, GFP_KERNEL);
 656         if (!cl)
 657                 return -ENOMEM;
 658
 659         hdev = hci_dev_get(req.dev_id);
 660         if (!hdev) {
 661                 kfree(cl);
 662                 return -ENODEV;
 663         }
 664
 665         ci = cl->conn_info;
 666
 667         hci_dev_lock_bh(hdev);
 668         list_for_each(p, &hdev->conn_hash.list) {
 669                 register struct hci_conn *c;
 670                 c = list_entry(p, struct hci_conn, list);
 671
 672                 bacpy(&(ci + n)->bdaddr, &c->dst);
 673                 (ci + n)->handle = c->handle;
 674                 (ci + n)->type  = c->type;
 675                 (ci + n)->out   = c->out;
 676                 (ci + n)->state = c->state;
 677                 (ci + n)->link_mode = c->link_mode;
 678                 if (++n >= req.conn_num)
 679                         break;
 680         }
 681         hci_dev_unlock_bh(hdev);
 682
 683         cl->dev_id = hdev->id;
 684         cl->conn_num = n;
 685         size = sizeof(req) + n * sizeof(*ci);
 686
 687         hci_dev_put(hdev);
 688
 689         err = copy_to_user(arg, cl, size);
 690         kfree(cl);
 691
 692         return err ? -EFAULT : 0;
 693 }
 694
 695 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
 696 {
 697         struct hci_conn_info_req req;
 698         struct hci_conn_info ci;
 699         struct hci_conn *conn;
 700         char __user *ptr = arg + sizeof(req);
 701
 702         if (copy_from_user(&req, arg, sizeof(req)))
 703                 return -EFAULT;
 704
 705         hci_dev_lock_bh(hdev);
 706         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
 707         if (conn) {
 708                 bacpy(&ci.bdaddr, &conn->dst);
 709                 ci.handle = conn->handle;
 710                 ci.type  = conn->type;
 711                 ci.out   = conn->out;
 712                 ci.state = conn->state;
 713                 ci.link_mode = conn->link_mode;
 714         }
 715         hci_dev_unlock_bh(hdev);
 716
 717         if (!conn)
 718                 return -ENOENT;
 719
 720         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
 721 }
 722
 723 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
 724 {
 725         struct hci_auth_info_req req;
 726         struct hci_conn *conn;
 727
 728         if (copy_from_user(&req, arg, sizeof(req)))
 729                 return -EFAULT;
 730
 731         hci_dev_lock_bh(hdev);
 732         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
 733         if (conn)
 734                 req.type = conn->auth_type;
 735         hci_dev_unlock_bh(hdev);
 736
 737         if (!conn)
 738                 return -ENOENT;
 739
 740         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
 741 }