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 static void hci_le_connect(struct hci_conn *conn)
  49 {
  50         struct hci_dev *hdev = conn->hdev;
  51         struct hci_cp_le_create_conn cp;
  52
  53         conn->state = BT_CONNECT;
  54         conn->out = 1;
  55         conn->link_mode |= HCI_LM_MASTER;
  56         conn->sec_level = BT_SECURITY_LOW;
  57
  58         memset(&cp, 0, sizeof(cp));
  59         cp.scan_interval = cpu_to_le16(0x0060);
  60         cp.scan_window = cpu_to_le16(0x0030);
  61         bacpy(&cp.peer_addr, &conn->dst);
  62         cp.peer_addr_type = conn->dst_type;
  63         cp.conn_interval_min = cpu_to_le16(0x0028);
  64         cp.conn_interval_max = cpu_to_le16(0x0038);
  65         cp.supervision_timeout = cpu_to_le16(0x002a);
  66         cp.min_ce_len = cpu_to_le16(0x0000);
  67         cp.max_ce_len = cpu_to_le16(0x0000);
  68
  69         hci_send_cmd(hdev, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
  70 }
  71
  72 static void hci_le_connect_cancel(struct hci_conn *conn)
  73 {
  74         hci_send_cmd(conn->hdev, HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL);
  75 }
  76
  77 void hci_acl_connect(struct hci_conn *conn)
  78 {
  79         struct hci_dev *hdev = conn->hdev;
  80         struct inquiry_entry *ie;
  81         struct hci_cp_create_conn cp;
  82
  83         BT_DBG("%p", conn);
  84
  85         conn->state = BT_CONNECT;
  86         conn->out = 1;
  87
  88         conn->link_mode = HCI_LM_MASTER;
  89
  90         conn->attempt++;
  91
  92         conn->link_policy = hdev->link_policy;
  93
  94         memset(&cp, 0, sizeof(cp));
  95         bacpy(&cp.bdaddr, &conn->dst);
  96         cp.pscan_rep_mode = 0x02;
  97
  98         ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
  99         if (ie) {
 100                 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
 101                         cp.pscan_rep_mode = ie->data.pscan_rep_mode;
 102                         cp.pscan_mode     = ie->data.pscan_mode;
 103                         cp.clock_offset   = ie->data.clock_offset |
 104                                                         cpu_to_le16(0x8000);
 105                 }
 106
 107                 memcpy(conn->dev_class, ie->data.dev_class, 3);
 108                 conn->ssp_mode = ie->data.ssp_mode;
 109         }
 110
 111         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 112         if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
 113                 cp.role_switch = 0x01;
 114         else
 115                 cp.role_switch = 0x00;
 116
 117         hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
 118 }
 119
 120 static void hci_acl_connect_cancel(struct hci_conn *conn)
 121 {
 122         struct hci_cp_create_conn_cancel cp;
 123
 124         BT_DBG("%p", conn);
 125
 126         if (conn->hdev->hci_ver < 2)
 127                 return;
 128
 129         bacpy(&cp.bdaddr, &conn->dst);
 130         hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
 131 }
 132
 133 void hci_acl_disconn(struct hci_conn *conn, __u8 reason)
 134 {
 135         struct hci_cp_disconnect cp;
 136
 137         BT_DBG("%p", conn);
 138
 139         conn->state = BT_DISCONN;
 140
 141         cp.handle = cpu_to_le16(conn->handle);
 142         cp.reason = reason;
 143         hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
 144 }
 145
 146 void hci_add_sco(struct hci_conn *conn, __u16 handle)
 147 {
 148         struct hci_dev *hdev = conn->hdev;
 149         struct hci_cp_add_sco cp;
 150
 151         BT_DBG("%p", conn);
 152
 153         conn->state = BT_CONNECT;
 154         conn->out = 1;
 155
 156         conn->attempt++;
 157
 158         cp.handle   = cpu_to_le16(handle);
 159         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 160
 161         hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 162 }
 163
 164 void hci_setup_sync(struct hci_conn *conn, __u16 handle)
 165 {
 166         struct hci_dev *hdev = conn->hdev;
 167         struct hci_cp_setup_sync_conn cp;
 168
 169         BT_DBG("%p", conn);
 170
 171         conn->state = BT_CONNECT;
 172         conn->out = 1;
 173
 174         conn->attempt++;
 175
 176         cp.handle   = cpu_to_le16(handle);
 177         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 178
 179         cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
 180         cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
 181         cp.max_latency    = cpu_to_le16(0xffff);
 182         cp.voice_setting  = cpu_to_le16(hdev->voice_setting);
 183         cp.retrans_effort = 0xff;
 184
 185         hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp);
 186 }
 187
 188 void hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max,
 189                                         u16 latency, u16 to_multiplier)
 190 {
 191         struct hci_cp_le_conn_update cp;
 192         struct hci_dev *hdev = conn->hdev;
 193
 194         memset(&cp, 0, sizeof(cp));
 195
 196         cp.handle               = cpu_to_le16(conn->handle);
 197         cp.conn_interval_min    = cpu_to_le16(min);
 198         cp.conn_interval_max    = cpu_to_le16(max);
 199         cp.conn_latency         = cpu_to_le16(latency);
 200         cp.supervision_timeout  = cpu_to_le16(to_multiplier);
 201         cp.min_ce_len           = cpu_to_le16(0x0001);
 202         cp.max_ce_len           = cpu_to_le16(0x0001);
 203
 204         hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
 205 }
 206 EXPORT_SYMBOL(hci_le_conn_update);
 207
 208 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __u8 rand[8],
 209                                                         __u8 ltk[16])
 210 {
 211         struct hci_dev *hdev = conn->hdev;
 212         struct hci_cp_le_start_enc cp;
 213
 214         BT_DBG("%p", conn);
 215
 216         memset(&cp, 0, sizeof(cp));
 217
 218         cp.handle = cpu_to_le16(conn->handle);
 219         memcpy(cp.ltk, ltk, sizeof(cp.ltk));
 220         cp.ediv = ediv;
 221         memcpy(cp.rand, rand, sizeof(cp.rand));
 222
 223         hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
 224 }
 225 EXPORT_SYMBOL(hci_le_start_enc);
 226
 227 void hci_le_ltk_reply(struct hci_conn *conn, u8 ltk[16])
 228 {
 229         struct hci_dev *hdev = conn->hdev;
 230         struct hci_cp_le_ltk_reply cp;
 231
 232         BT_DBG("%p", conn);
 233
 234         memset(&cp, 0, sizeof(cp));
 235
 236         cp.handle = cpu_to_le16(conn->handle);
 237         memcpy(cp.ltk, ltk, sizeof(ltk));
 238
 239         hci_send_cmd(hdev, HCI_OP_LE_LTK_REPLY, sizeof(cp), &cp);
 240 }
 241 EXPORT_SYMBOL(hci_le_ltk_reply);
 242
 243 void hci_le_ltk_neg_reply(struct hci_conn *conn)
 244 {
 245         struct hci_dev *hdev = conn->hdev;
 246         struct hci_cp_le_ltk_neg_reply cp;
 247
 248         BT_DBG("%p", conn);
 249
 250         memset(&cp, 0, sizeof(cp));
 251
 252         cp.handle = cpu_to_le16(conn->handle);
 253
 254         hci_send_cmd(hdev, HCI_OP_LE_LTK_NEG_REPLY, sizeof(cp), &cp);
 255 }
 256
 257 /* Device _must_ be locked */
 258 void hci_sco_setup(struct hci_conn *conn, __u8 status)
 259 {
 260         struct hci_conn *sco = conn->link;
 261
 262         BT_DBG("%p", conn);
 263
 264         if (!sco)
 265                 return;
 266
 267         if (!status) {
 268                 if (lmp_esco_capable(conn->hdev))
 269                         hci_setup_sync(sco, conn->handle);
 270                 else
 271                         hci_add_sco(sco, conn->handle);
 272         } else {
 273                 hci_proto_connect_cfm(sco, status);
 274                 hci_conn_del(sco);
 275         }
 276 }
 277
 278 static void hci_conn_timeout(unsigned long arg)
 279 {
 280         struct hci_conn *conn = (void *) arg;
 281         struct hci_dev *hdev = conn->hdev;
 282         __u8 reason;
 283
 284         BT_DBG("conn %p state %d", conn, conn->state);
 285
 286         if (atomic_read(&conn->refcnt))
 287                 return;
 288
 289         hci_dev_lock(hdev);
 290
 291         switch (conn->state) {
 292         case BT_CONNECT:
 293         case BT_CONNECT2:
 294                 if (conn->out) {
 295                         if (conn->type == ACL_LINK)
 296                                 hci_acl_connect_cancel(conn);
 297                         else if (conn->type == LE_LINK)
 298                                 hci_le_connect_cancel(conn);
 299                 }
 300                 break;
 301         case BT_CONFIG:
 302         case BT_CONNECTED:
 303                 reason = hci_proto_disconn_ind(conn);
 304                 hci_acl_disconn(conn, reason);
 305                 break;
 306         default:
 307                 conn->state = BT_CLOSED;
 308                 break;
 309         }
 310
 311         hci_dev_unlock(hdev);
 312 }
 313
 314 static void hci_conn_idle(unsigned long arg)
 315 {
 316         struct hci_conn *conn = (void *) arg;
 317
 318         BT_DBG("conn %p mode %d", conn, conn->mode);
 319
 320         hci_conn_enter_sniff_mode(conn);
 321 }
 322
 323 static void hci_conn_auto_accept(unsigned long arg)
 324 {
 325         struct hci_conn *conn = (void *) arg;
 326         struct hci_dev *hdev = conn->hdev;
 327
 328         hci_dev_lock(hdev);
 329
 330         hci_send_cmd(hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
 331                                                                 &conn->dst);
 332
 333         hci_dev_unlock(hdev);
 334 }
 335
 336 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 337 {
 338         struct hci_conn *conn;
 339
 340         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 341
 342         conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
 343         if (!conn)
 344                 return NULL;
 345
 346         bacpy(&conn->dst, dst);
 347         conn->hdev  = hdev;
 348         conn->type  = type;
 349         conn->mode  = HCI_CM_ACTIVE;
 350         conn->state = BT_OPEN;
 351         conn->auth_type = HCI_AT_GENERAL_BONDING;
 352         conn->io_capability = hdev->io_capability;
 353         conn->remote_auth = 0xff;
 354         conn->key_type = 0xff;
 355
 356         conn->power_save = 1;
 357         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 358
 359         switch (type) {
 360         case ACL_LINK:
 361                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 362                 break;
 363         case SCO_LINK:
 364                 if (lmp_esco_capable(hdev))
 365                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 366                                         (hdev->esco_type & EDR_ESCO_MASK);
 367                 else
 368                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 369                 break;
 370         case ESCO_LINK:
 371                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 372                 break;
 373         }
 374
 375         skb_queue_head_init(&conn->data_q);
 376
 377         setup_timer(&conn->disc_timer, hci_conn_timeout, (unsigned long)conn);
 378         setup_timer(&conn->idle_timer, hci_conn_idle, (unsigned long)conn);
 379         setup_timer(&conn->auto_accept_timer, hci_conn_auto_accept,
 380                                                         (unsigned long) conn);
 381
 382         atomic_set(&conn->refcnt, 0);
 383
 384         hci_dev_hold(hdev);
 385
 386         tasklet_disable(&hdev->tx_task);
 387
 388         hci_conn_hash_add(hdev, conn);
 389         if (hdev->notify)
 390                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 391
 392         atomic_set(&conn->devref, 0);
 393
 394         hci_conn_init_sysfs(conn);
 395
 396         tasklet_enable(&hdev->tx_task);
 397
 398         return conn;
 399 }
 400
 401 int hci_conn_del(struct hci_conn *conn)
 402 {
 403         struct hci_dev *hdev = conn->hdev;
 404
 405         BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
 406
 407         del_timer(&conn->idle_timer);
 408
 409         del_timer(&conn->disc_timer);
 410
 411         del_timer(&conn->auto_accept_timer);
 412
 413         if (conn->type == ACL_LINK) {
 414                 struct hci_conn *sco = conn->link;
 415                 if (sco)
 416                         sco->link = NULL;
 417
 418                 /* Unacked frames */
 419                 hdev->acl_cnt += conn->sent;
 420         } else if (conn->type == LE_LINK) {
 421                 if (hdev->le_pkts)
 422                         hdev->le_cnt += conn->sent;
 423                 else
 424                         hdev->acl_cnt += conn->sent;
 425         } else {
 426                 struct hci_conn *acl = conn->link;
 427                 if (acl) {
 428                         acl->link = NULL;
 429                         hci_conn_put(acl);
 430                 }
 431         }
 432
 433         tasklet_disable(&hdev->tx_task);
 434
 435         hci_conn_hash_del(hdev, conn);
 436         if (hdev->notify)
 437                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 438
 439         tasklet_enable(&hdev->tx_task);
 440
 441         skb_queue_purge(&conn->data_q);
 442
 443         hci_conn_put_device(conn);
 444
 445         hci_dev_put(hdev);
 446
 447         if (conn->handle == 0)
 448                 kfree(conn);
 449
 450         return 0;
 451 }
 452
 453 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
 454 {
 455         int use_src = bacmp(src, BDADDR_ANY);
 456         struct hci_dev *hdev = NULL;
 457         struct list_head *p;
 458
 459         BT_DBG("%s -> %s", batostr(src), batostr(dst));
 460
 461         read_lock_bh(&hci_dev_list_lock);
 462
 463         list_for_each(p, &hci_dev_list) {
 464                 struct hci_dev *d = list_entry(p, struct hci_dev, list);
 465
 466                 if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
 467                         continue;
 468
 469                 /* Simple routing:
 470                  *   No source address - find interface with bdaddr != dst
 471                  *   Source address    - find interface with bdaddr == src
 472                  */
 473
 474                 if (use_src) {
 475                         if (!bacmp(&d->bdaddr, src)) {
 476                                 hdev = d; break;
 477                         }
 478                 } else {
 479                         if (bacmp(&d->bdaddr, dst)) {
 480                                 hdev = d; break;
 481                         }
 482                 }
 483         }
 484
 485         if (hdev)
 486                 hdev = hci_dev_hold(hdev);
 487
 488         read_unlock_bh(&hci_dev_list_lock);
 489         return hdev;
 490 }
 491 EXPORT_SYMBOL(hci_get_route);
 492
 493 /* Create SCO, ACL or LE connection.
 494  * Device _must_ be locked */
 495 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 sec_level, __u8 auth_type)
 496 {
 497         struct hci_conn *acl;
 498         struct hci_conn *sco;
 499         struct hci_conn *le;
 500
 501         BT_DBG("%s dst %s", hdev->name, batostr(dst));
 502
 503         if (type == LE_LINK) {
 504                 struct adv_entry *entry;
 505
 506                 le = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
 507                 if (le)
 508                         return ERR_PTR(-EBUSY);
 509
 510                 entry = hci_find_adv_entry(hdev, dst);
 511                 if (!entry)
 512                         return ERR_PTR(-EHOSTUNREACH);
 513
 514                 le = hci_conn_add(hdev, LE_LINK, dst);
 515                 if (!le)
 516                         return ERR_PTR(-ENOMEM);
 517
 518                 le->dst_type = entry->bdaddr_type;
 519
 520                 hci_le_connect(le);
 521
 522                 hci_conn_hold(le);
 523
 524                 return le;
 525         }
 526
 527         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
 528         if (!acl) {
 529                 acl = hci_conn_add(hdev, ACL_LINK, dst);
 530                 if (!acl)
 531                         return NULL;
 532         }
 533
 534         hci_conn_hold(acl);
 535
 536         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
 537                 acl->sec_level = BT_SECURITY_LOW;
 538                 acl->pending_sec_level = sec_level;
 539                 acl->auth_type = auth_type;
 540                 hci_acl_connect(acl);
 541         }
 542
 543         if (type == ACL_LINK)
 544                 return acl;
 545
 546         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
 547         if (!sco) {
 548                 sco = hci_conn_add(hdev, type, dst);
 549                 if (!sco) {
 550                         hci_conn_put(acl);
 551                         return NULL;
 552                 }
 553         }
 554
 555         acl->link = sco;
 556         sco->link = acl;
 557
 558         hci_conn_hold(sco);
 559
 560         if (acl->state == BT_CONNECTED &&
 561                         (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 562                 acl->power_save = 1;
 563                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
 564
 565                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->pend)) {
 566                         /* defer SCO setup until mode change completed */
 567                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->pend);
 568                         return sco;
 569                 }
 570
 571                 hci_sco_setup(acl, 0x00);
 572         }
 573
 574         return sco;
 575 }
 576 EXPORT_SYMBOL(hci_connect);
 577
 578 /* Check link security requirement */
 579 int hci_conn_check_link_mode(struct hci_conn *conn)
 580 {
 581         BT_DBG("conn %p", conn);
 582
 583         if (conn->ssp_mode > 0 && conn->hdev->ssp_mode > 0 &&
 584                                         !(conn->link_mode & HCI_LM_ENCRYPT))
 585                 return 0;
 586
 587         return 1;
 588 }
 589 EXPORT_SYMBOL(hci_conn_check_link_mode);
 590
 591 /* Authenticate remote device */
 592 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 593 {
 594         BT_DBG("conn %p", conn);
 595
 596         if (conn->pending_sec_level > sec_level)
 597                 sec_level = conn->pending_sec_level;
 598
 599         if (sec_level > conn->sec_level)
 600                 conn->pending_sec_level = sec_level;
 601         else if (conn->link_mode & HCI_LM_AUTH)
 602                 return 1;
 603
 604         /* Make sure we preserve an existing MITM requirement*/
 605         auth_type |= (conn->auth_type & 0x01);
 606
 607         conn->auth_type = auth_type;
 608
 609         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 610                 struct hci_cp_auth_requested cp;
 611                 cp.handle = cpu_to_le16(conn->handle);
 612                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 613                                                         sizeof(cp), &cp);
 614                 if (conn->key_type != 0xff)
 615                         set_bit(HCI_CONN_REAUTH_PEND, &conn->pend);
 616         }
 617
 618         return 0;
 619 }
 620
 621 /* Encrypt the the link */
 622 static void hci_conn_encrypt(struct hci_conn *conn)
 623 {
 624         BT_DBG("conn %p", conn);
 625
 626         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend)) {
 627                 struct hci_cp_set_conn_encrypt cp;
 628                 cp.handle  = cpu_to_le16(conn->handle);
 629                 cp.encrypt = 0x01;
 630                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
 631                                                                         &cp);
 632         }
 633 }
 634
 635 /* Enable security */
 636 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 637 {
 638         BT_DBG("conn %p", conn);
 639
 640         /* For sdp we don't need the link key. */
 641         if (sec_level == BT_SECURITY_SDP)
 642                 return 1;
 643
 644         /* For non 2.1 devices and low security level we don't need the link
 645            key. */
 646         if (sec_level == BT_SECURITY_LOW &&
 647                                 (!conn->ssp_mode || !conn->hdev->ssp_mode))
 648                 return 1;
 649
 650         /* For other security levels we need the link key. */
 651         if (!(conn->link_mode & HCI_LM_AUTH))
 652                 goto auth;
 653
 654         /* An authenticated combination key has sufficient security for any
 655            security level. */
 656         if (conn->key_type == HCI_LK_AUTH_COMBINATION)
 657                 goto encrypt;
 658
 659         /* An unauthenticated combination key has sufficient security for
 660            security level 1 and 2. */
 661         if (conn->key_type == HCI_LK_UNAUTH_COMBINATION &&
 662                         (sec_level == BT_SECURITY_MEDIUM ||
 663                         sec_level == BT_SECURITY_LOW))
 664                 goto encrypt;
 665
 666         /* A combination key has always sufficient security for the security
 667            levels 1 or 2. High security level requires the combination key
 668            is generated using maximum PIN code length (16).
 669            For pre 2.1 units. */
 670         if (conn->key_type == HCI_LK_COMBINATION &&
 671                         (sec_level != BT_SECURITY_HIGH ||
 672                         conn->pin_length == 16))
 673                 goto encrypt;
 674
 675 auth:
 676         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
 677                 return 0;
 678
 679         if (!hci_conn_auth(conn, sec_level, auth_type))
 680                 return 0;
 681
 682 encrypt:
 683         if (conn->link_mode & HCI_LM_ENCRYPT)
 684                 return 1;
 685
 686         hci_conn_encrypt(conn);
 687         return 0;
 688 }
 689 EXPORT_SYMBOL(hci_conn_security);
 690
 691 /* Check secure link requirement */
 692 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
 693 {
 694         BT_DBG("conn %p", conn);
 695
 696         if (sec_level != BT_SECURITY_HIGH)
 697                 return 1; /* Accept if non-secure is required */
 698
 699         if (conn->sec_level == BT_SECURITY_HIGH)
 700                 return 1;
 701
 702         return 0; /* Reject not secure link */
 703 }
 704 EXPORT_SYMBOL(hci_conn_check_secure);
 705
 706 /* Change link key */
 707 int hci_conn_change_link_key(struct hci_conn *conn)
 708 {
 709         BT_DBG("conn %p", conn);
 710
 711         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
 712                 struct hci_cp_change_conn_link_key cp;
 713                 cp.handle = cpu_to_le16(conn->handle);
 714                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 715                                                         sizeof(cp), &cp);
 716         }
 717
 718         return 0;
 719 }
 720 EXPORT_SYMBOL(hci_conn_change_link_key);
 721
 722 /* Switch role */
 723 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
 724 {
 725         BT_DBG("conn %p", conn);
 726
 727         if (!role && conn->link_mode & HCI_LM_MASTER)
 728                 return 1;
 729
 730         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
 731                 struct hci_cp_switch_role cp;
 732                 bacpy(&cp.bdaddr, &conn->dst);
 733                 cp.role = role;
 734                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 735         }
 736
 737         return 0;
 738 }
 739 EXPORT_SYMBOL(hci_conn_switch_role);
 740
 741 /* Enter active mode */
 742 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
 743 {
 744         struct hci_dev *hdev = conn->hdev;
 745
 746         BT_DBG("conn %p mode %d", conn, conn->mode);
 747
 748         if (test_bit(HCI_RAW, &hdev->flags))
 749                 return;
 750
 751         if (conn->mode != HCI_CM_SNIFF)
 752                 goto timer;
 753
 754         if (!conn->power_save && !force_active)
 755                 goto timer;
 756
 757         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 758                 struct hci_cp_exit_sniff_mode cp;
 759                 cp.handle = cpu_to_le16(conn->handle);
 760                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 761         }
 762
 763 timer:
 764         if (hdev->idle_timeout > 0)
 765                 mod_timer(&conn->idle_timer,
 766                         jiffies + msecs_to_jiffies(hdev->idle_timeout));
 767 }
 768
 769 /* Enter sniff mode */
 770 void hci_conn_enter_sniff_mode(struct hci_conn *conn)
 771 {
 772         struct hci_dev *hdev = conn->hdev;
 773
 774         BT_DBG("conn %p mode %d", conn, conn->mode);
 775
 776         if (test_bit(HCI_RAW, &hdev->flags))
 777                 return;
 778
 779         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 780                 return;
 781
 782         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 783                 return;
 784
 785         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 786                 struct hci_cp_sniff_subrate cp;
 787                 cp.handle             = cpu_to_le16(conn->handle);
 788                 cp.max_latency        = cpu_to_le16(0);
 789                 cp.min_remote_timeout = cpu_to_le16(0);
 790                 cp.min_local_timeout  = cpu_to_le16(0);
 791                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 792         }
 793
 794         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
 795                 struct hci_cp_sniff_mode cp;
 796                 cp.handle       = cpu_to_le16(conn->handle);
 797                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 798                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 799                 cp.attempt      = cpu_to_le16(4);
 800                 cp.timeout      = cpu_to_le16(1);
 801                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 802         }
 803 }
 804
 805 /* Drop all connection on the device */
 806 void hci_conn_hash_flush(struct hci_dev *hdev)
 807 {
 808         struct hci_conn_hash *h = &hdev->conn_hash;
 809         struct list_head *p;
 810
 811         BT_DBG("hdev %s", hdev->name);
 812
 813         p = h->list.next;
 814         while (p != &h->list) {
 815                 struct hci_conn *c;
 816
 817                 c = list_entry(p, struct hci_conn, list);
 818                 p = p->next;
 819
 820                 c->state = BT_CLOSED;
 821
 822                 hci_proto_disconn_cfm(c, 0x16);
 823                 hci_conn_del(c);
 824         }
 825 }
 826
 827 /* Check pending connect attempts */
 828 void hci_conn_check_pending(struct hci_dev *hdev)
 829 {
 830         struct hci_conn *conn;
 831
 832         BT_DBG("hdev %s", hdev->name);
 833
 834         hci_dev_lock(hdev);
 835
 836         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
 837         if (conn)
 838                 hci_acl_connect(conn);
 839
 840         hci_dev_unlock(hdev);
 841 }
 842
 843 void hci_conn_hold_device(struct hci_conn *conn)
 844 {
 845         atomic_inc(&conn->devref);
 846 }
 847 EXPORT_SYMBOL(hci_conn_hold_device);
 848
 849 void hci_conn_put_device(struct hci_conn *conn)
 850 {
 851         if (atomic_dec_and_test(&conn->devref))
 852                 hci_conn_del_sysfs(conn);
 853 }
 854 EXPORT_SYMBOL(hci_conn_put_device);
 855
 856 int hci_get_conn_list(void __user *arg)
 857 {
 858         struct hci_conn_list_req req, *cl;
 859         struct hci_conn_info *ci;
 860         struct hci_dev *hdev;
 861         struct list_head *p;
 862         int n = 0, size, err;
 863
 864         if (copy_from_user(&req, arg, sizeof(req)))
 865                 return -EFAULT;
 866
 867         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
 868                 return -EINVAL;
 869
 870         size = sizeof(req) + req.conn_num * sizeof(*ci);
 871
 872         cl = kmalloc(size, GFP_KERNEL);
 873         if (!cl)
 874                 return -ENOMEM;
 875
 876         hdev = hci_dev_get(req.dev_id);
 877         if (!hdev) {
 878                 kfree(cl);
 879                 return -ENODEV;
 880         }
 881
 882         ci = cl->conn_info;
 883
 884         hci_dev_lock_bh(hdev);
 885         list_for_each(p, &hdev->conn_hash.list) {
 886                 register struct hci_conn *c;
 887                 c = list_entry(p, struct hci_conn, list);
 888
 889                 bacpy(&(ci + n)->bdaddr, &c->dst);
 890                 (ci + n)->handle = c->handle;
 891                 (ci + n)->type  = c->type;
 892                 (ci + n)->out   = c->out;
 893                 (ci + n)->state = c->state;
 894                 (ci + n)->link_mode = c->link_mode;
 895                 if (++n >= req.conn_num)
 896                         break;
 897         }
 898         hci_dev_unlock_bh(hdev);
 899
 900         cl->dev_id = hdev->id;
 901         cl->conn_num = n;
 902         size = sizeof(req) + n * sizeof(*ci);
 903
 904         hci_dev_put(hdev);
 905
 906         err = copy_to_user(arg, cl, size);
 907         kfree(cl);
 908
 909         return err ? -EFAULT : 0;
 910 }
 911
 912 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
 913 {
 914         struct hci_conn_info_req req;
 915         struct hci_conn_info ci;
 916         struct hci_conn *conn;
 917         char __user *ptr = arg + sizeof(req);
 918
 919         if (copy_from_user(&req, arg, sizeof(req)))
 920                 return -EFAULT;
 921
 922         hci_dev_lock_bh(hdev);
 923         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
 924         if (conn) {
 925                 bacpy(&ci.bdaddr, &conn->dst);
 926                 ci.handle = conn->handle;
 927                 ci.type  = conn->type;
 928                 ci.out   = conn->out;
 929                 ci.state = conn->state;
 930                 ci.link_mode = conn->link_mode;
 931         }
 932         hci_dev_unlock_bh(hdev);
 933
 934         if (!conn)
 935                 return -ENOENT;
 936
 937         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
 938 }
 939
 940 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
 941 {
 942         struct hci_auth_info_req req;
 943         struct hci_conn *conn;
 944
 945         if (copy_from_user(&req, arg, sizeof(req)))
 946                 return -EFAULT;
 947
 948         hci_dev_lock_bh(hdev);
 949         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
 950         if (conn)
 951                 req.type = conn->auth_type;
 952         hci_dev_unlock_bh(hdev);
 953
 954         if (!conn)
 955                 return -ENOENT;
 956
 957         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
 958 }