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/export.h>
  28
  29 #include <net/bluetooth/bluetooth.h>
  30 #include <net/bluetooth/hci_core.h>
  31
  32 #include "smp.h"
  33 #include "a2mp.h"
  34
  35 struct sco_param {
  36         u16 pkt_type;
  37         u16 max_latency;
  38 };
  39
  40 static const struct sco_param sco_param_cvsd[] = {
  41         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a }, /* S3 */
  42         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007 }, /* S2 */
  43         { EDR_ESCO_MASK | ESCO_EV3,   0x0007 }, /* S1 */
  44         { EDR_ESCO_MASK | ESCO_HV3,   0xffff }, /* D1 */
  45         { EDR_ESCO_MASK | ESCO_HV1,   0xffff }, /* D0 */
  46 };
  47
  48 static const struct sco_param sco_param_wideband[] = {
  49         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d }, /* T2 */
  50         { EDR_ESCO_MASK | ESCO_EV3,   0x0008 }, /* T1 */
  51 };
  52
  53 static void hci_le_create_connection_cancel(struct hci_conn *conn)
  54 {
  55         hci_send_cmd(conn->hdev, HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL);
  56 }
  57
  58 static void hci_acl_create_connection(struct hci_conn *conn)
  59 {
  60         struct hci_dev *hdev = conn->hdev;
  61         struct inquiry_entry *ie;
  62         struct hci_cp_create_conn cp;
  63
  64         BT_DBG("hcon %p", conn);
  65
  66         conn->state = BT_CONNECT;
  67         conn->out = true;
  68
  69         conn->link_mode = HCI_LM_MASTER;
  70
  71         conn->attempt++;
  72
  73         conn->link_policy = hdev->link_policy;
  74
  75         memset(&cp, 0, sizeof(cp));
  76         bacpy(&cp.bdaddr, &conn->dst);
  77         cp.pscan_rep_mode = 0x02;
  78
  79         ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
  80         if (ie) {
  81                 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
  82                         cp.pscan_rep_mode = ie->data.pscan_rep_mode;
  83                         cp.pscan_mode     = ie->data.pscan_mode;
  84                         cp.clock_offset   = ie->data.clock_offset |
  85                                             __constant_cpu_to_le16(0x8000);
  86                 }
  87
  88                 memcpy(conn->dev_class, ie->data.dev_class, 3);
  89                 if (ie->data.ssp_mode > 0)
  90                         set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
  91         }
  92
  93         cp.pkt_type = cpu_to_le16(conn->pkt_type);
  94         if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
  95                 cp.role_switch = 0x01;
  96         else
  97                 cp.role_switch = 0x00;
  98
  99         hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
 100 }
 101
 102 static void hci_acl_create_connection_cancel(struct hci_conn *conn)
 103 {
 104         struct hci_cp_create_conn_cancel cp;
 105
 106         BT_DBG("hcon %p", conn);
 107
 108         if (conn->hdev->hci_ver < BLUETOOTH_VER_1_2)
 109                 return;
 110
 111         bacpy(&cp.bdaddr, &conn->dst);
 112         hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
 113 }
 114
 115 static void hci_reject_sco(struct hci_conn *conn)
 116 {
 117         struct hci_cp_reject_sync_conn_req cp;
 118
 119         cp.reason = HCI_ERROR_REMOTE_USER_TERM;
 120         bacpy(&cp.bdaddr, &conn->dst);
 121
 122         hci_send_cmd(conn->hdev, HCI_OP_REJECT_SYNC_CONN_REQ, sizeof(cp), &cp);
 123 }
 124
 125 void hci_disconnect(struct hci_conn *conn, __u8 reason)
 126 {
 127         struct hci_cp_disconnect cp;
 128
 129         BT_DBG("hcon %p", conn);
 130
 131         conn->state = BT_DISCONN;
 132
 133         cp.handle = cpu_to_le16(conn->handle);
 134         cp.reason = reason;
 135         hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
 136 }
 137
 138 static void hci_amp_disconn(struct hci_conn *conn, __u8 reason)
 139 {
 140         struct hci_cp_disconn_phy_link cp;
 141
 142         BT_DBG("hcon %p", conn);
 143
 144         conn->state = BT_DISCONN;
 145
 146         cp.phy_handle = HCI_PHY_HANDLE(conn->handle);
 147         cp.reason = reason;
 148         hci_send_cmd(conn->hdev, HCI_OP_DISCONN_PHY_LINK,
 149                      sizeof(cp), &cp);
 150 }
 151
 152 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
 153 {
 154         struct hci_dev *hdev = conn->hdev;
 155         struct hci_cp_add_sco cp;
 156
 157         BT_DBG("hcon %p", conn);
 158
 159         conn->state = BT_CONNECT;
 160         conn->out = true;
 161
 162         conn->attempt++;
 163
 164         cp.handle   = cpu_to_le16(handle);
 165         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 166
 167         hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 168 }
 169
 170 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
 171 {
 172         struct hci_dev *hdev = conn->hdev;
 173         struct hci_cp_setup_sync_conn cp;
 174         const struct sco_param *param;
 175
 176         BT_DBG("hcon %p", conn);
 177
 178         conn->state = BT_CONNECT;
 179         conn->out = true;
 180
 181         conn->attempt++;
 182
 183         cp.handle   = cpu_to_le16(handle);
 184
 185         cp.tx_bandwidth   = __constant_cpu_to_le32(0x00001f40);
 186         cp.rx_bandwidth   = __constant_cpu_to_le32(0x00001f40);
 187         cp.voice_setting  = cpu_to_le16(conn->setting);
 188
 189         switch (conn->setting & SCO_AIRMODE_MASK) {
 190         case SCO_AIRMODE_TRANSP:
 191                 if (conn->attempt > ARRAY_SIZE(sco_param_wideband))
 192                         return false;
 193                 cp.retrans_effort = 0x02;
 194                 param = &sco_param_wideband[conn->attempt - 1];
 195                 break;
 196         case SCO_AIRMODE_CVSD:
 197                 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
 198                         return false;
 199                 cp.retrans_effort = 0x01;
 200                 param = &sco_param_cvsd[conn->attempt - 1];
 201                 break;
 202         default:
 203                 return false;
 204         }
 205
 206         cp.pkt_type = __cpu_to_le16(param->pkt_type);
 207         cp.max_latency = __cpu_to_le16(param->max_latency);
 208
 209         if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
 210                 return false;
 211
 212         return true;
 213 }
 214
 215 void hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max,
 216                         u16 latency, u16 to_multiplier)
 217 {
 218         struct hci_cp_le_conn_update cp;
 219         struct hci_dev *hdev = conn->hdev;
 220
 221         memset(&cp, 0, sizeof(cp));
 222
 223         cp.handle               = cpu_to_le16(conn->handle);
 224         cp.conn_interval_min    = cpu_to_le16(min);
 225         cp.conn_interval_max    = cpu_to_le16(max);
 226         cp.conn_latency         = cpu_to_le16(latency);
 227         cp.supervision_timeout  = cpu_to_le16(to_multiplier);
 228         cp.min_ce_len           = __constant_cpu_to_le16(0x0000);
 229         cp.max_ce_len           = __constant_cpu_to_le16(0x0000);
 230
 231         hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
 232 }
 233
 234 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __u8 rand[8],
 235                       __u8 ltk[16])
 236 {
 237         struct hci_dev *hdev = conn->hdev;
 238         struct hci_cp_le_start_enc cp;
 239
 240         BT_DBG("hcon %p", conn);
 241
 242         memset(&cp, 0, sizeof(cp));
 243
 244         cp.handle = cpu_to_le16(conn->handle);
 245         memcpy(cp.ltk, ltk, sizeof(cp.ltk));
 246         cp.ediv = ediv;
 247         memcpy(cp.rand, rand, sizeof(cp.rand));
 248
 249         hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
 250 }
 251
 252 /* Device _must_ be locked */
 253 void hci_sco_setup(struct hci_conn *conn, __u8 status)
 254 {
 255         struct hci_conn *sco = conn->link;
 256
 257         if (!sco)
 258                 return;
 259
 260         BT_DBG("hcon %p", conn);
 261
 262         if (!status) {
 263                 if (lmp_esco_capable(conn->hdev))
 264                         hci_setup_sync(sco, conn->handle);
 265                 else
 266                         hci_add_sco(sco, conn->handle);
 267         } else {
 268                 hci_proto_connect_cfm(sco, status);
 269                 hci_conn_del(sco);
 270         }
 271 }
 272
 273 static void hci_conn_disconnect(struct hci_conn *conn)
 274 {
 275         __u8 reason = hci_proto_disconn_ind(conn);
 276
 277         switch (conn->type) {
 278         case AMP_LINK:
 279                 hci_amp_disconn(conn, reason);
 280                 break;
 281         default:
 282                 hci_disconnect(conn, reason);
 283                 break;
 284         }
 285 }
 286
 287 static void hci_conn_timeout(struct work_struct *work)
 288 {
 289         struct hci_conn *conn = container_of(work, struct hci_conn,
 290                                              disc_work.work);
 291
 292         BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
 293
 294         if (atomic_read(&conn->refcnt))
 295                 return;
 296
 297         switch (conn->state) {
 298         case BT_CONNECT:
 299         case BT_CONNECT2:
 300                 if (conn->out) {
 301                         if (conn->type == ACL_LINK)
 302                                 hci_acl_create_connection_cancel(conn);
 303                         else if (conn->type == LE_LINK)
 304                                 hci_le_create_connection_cancel(conn);
 305                 } else if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
 306                         hci_reject_sco(conn);
 307                 }
 308                 break;
 309         case BT_CONFIG:
 310         case BT_CONNECTED:
 311                 hci_conn_disconnect(conn);
 312                 break;
 313         default:
 314                 conn->state = BT_CLOSED;
 315                 break;
 316         }
 317 }
 318
 319 /* Enter sniff mode */
 320 static void hci_conn_idle(struct work_struct *work)
 321 {
 322         struct hci_conn *conn = container_of(work, struct hci_conn,
 323                                              idle_work.work);
 324         struct hci_dev *hdev = conn->hdev;
 325
 326         BT_DBG("hcon %p mode %d", conn, conn->mode);
 327
 328         if (test_bit(HCI_RAW, &hdev->flags))
 329                 return;
 330
 331         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 332                 return;
 333
 334         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 335                 return;
 336
 337         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 338                 struct hci_cp_sniff_subrate cp;
 339                 cp.handle             = cpu_to_le16(conn->handle);
 340                 cp.max_latency        = __constant_cpu_to_le16(0);
 341                 cp.min_remote_timeout = __constant_cpu_to_le16(0);
 342                 cp.min_local_timeout  = __constant_cpu_to_le16(0);
 343                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 344         }
 345
 346         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 347                 struct hci_cp_sniff_mode cp;
 348                 cp.handle       = cpu_to_le16(conn->handle);
 349                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 350                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 351                 cp.attempt      = __constant_cpu_to_le16(4);
 352                 cp.timeout      = __constant_cpu_to_le16(1);
 353                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 354         }
 355 }
 356
 357 static void hci_conn_auto_accept(struct work_struct *work)
 358 {
 359         struct hci_conn *conn = container_of(work, struct hci_conn,
 360                                              auto_accept_work.work);
 361
 362         hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
 363                      &conn->dst);
 364 }
 365
 366 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 367 {
 368         struct hci_conn *conn;
 369
 370         BT_DBG("%s dst %pMR", hdev->name, dst);
 371
 372         conn = kzalloc(sizeof(struct hci_conn), GFP_KERNEL);
 373         if (!conn)
 374                 return NULL;
 375
 376         bacpy(&conn->dst, dst);
 377         bacpy(&conn->src, &hdev->bdaddr);
 378         conn->hdev  = hdev;
 379         conn->type  = type;
 380         conn->mode  = HCI_CM_ACTIVE;
 381         conn->state = BT_OPEN;
 382         conn->auth_type = HCI_AT_GENERAL_BONDING;
 383         conn->io_capability = hdev->io_capability;
 384         conn->remote_auth = 0xff;
 385         conn->key_type = 0xff;
 386
 387         set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
 388         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 389
 390         switch (type) {
 391         case ACL_LINK:
 392                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 393                 break;
 394         case SCO_LINK:
 395                 if (lmp_esco_capable(hdev))
 396                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 397                                         (hdev->esco_type & EDR_ESCO_MASK);
 398                 else
 399                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 400                 break;
 401         case ESCO_LINK:
 402                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 403                 break;
 404         }
 405
 406         skb_queue_head_init(&conn->data_q);
 407
 408         INIT_LIST_HEAD(&conn->chan_list);
 409
 410         INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
 411         INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
 412         INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
 413
 414         atomic_set(&conn->refcnt, 0);
 415
 416         hci_dev_hold(hdev);
 417
 418         hci_conn_hash_add(hdev, conn);
 419         if (hdev->notify)
 420                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 421
 422         hci_conn_init_sysfs(conn);
 423
 424         return conn;
 425 }
 426
 427 int hci_conn_del(struct hci_conn *conn)
 428 {
 429         struct hci_dev *hdev = conn->hdev;
 430
 431         BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
 432
 433         cancel_delayed_work_sync(&conn->disc_work);
 434         cancel_delayed_work_sync(&conn->auto_accept_work);
 435         cancel_delayed_work_sync(&conn->idle_work);
 436
 437         if (conn->type == ACL_LINK) {
 438                 struct hci_conn *sco = conn->link;
 439                 if (sco)
 440                         sco->link = NULL;
 441
 442                 /* Unacked frames */
 443                 hdev->acl_cnt += conn->sent;
 444         } else if (conn->type == LE_LINK) {
 445                 if (hdev->le_pkts)
 446                         hdev->le_cnt += conn->sent;
 447                 else
 448                         hdev->acl_cnt += conn->sent;
 449         } else {
 450                 struct hci_conn *acl = conn->link;
 451                 if (acl) {
 452                         acl->link = NULL;
 453                         hci_conn_drop(acl);
 454                 }
 455         }
 456
 457         hci_chan_list_flush(conn);
 458
 459         if (conn->amp_mgr)
 460                 amp_mgr_put(conn->amp_mgr);
 461
 462         hci_conn_hash_del(hdev, conn);
 463         if (hdev->notify)
 464                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 465
 466         skb_queue_purge(&conn->data_q);
 467
 468         hci_conn_del_sysfs(conn);
 469
 470         hci_dev_put(hdev);
 471
 472         hci_conn_put(conn);
 473
 474         return 0;
 475 }
 476
 477 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
 478 {
 479         int use_src = bacmp(src, BDADDR_ANY);
 480         struct hci_dev *hdev = NULL, *d;
 481
 482         BT_DBG("%pMR -> %pMR", src, dst);
 483
 484         read_lock(&hci_dev_list_lock);
 485
 486         list_for_each_entry(d, &hci_dev_list, list) {
 487                 if (!test_bit(HCI_UP, &d->flags) ||
 488                     test_bit(HCI_RAW, &d->flags) ||
 489                     test_bit(HCI_USER_CHANNEL, &d->dev_flags) ||
 490                     d->dev_type != HCI_BREDR)
 491                         continue;
 492
 493                 /* Simple routing:
 494                  *   No source address - find interface with bdaddr != dst
 495                  *   Source address    - find interface with bdaddr == src
 496                  */
 497
 498                 if (use_src) {
 499                         if (!bacmp(&d->bdaddr, src)) {
 500                                 hdev = d; break;
 501                         }
 502                 } else {
 503                         if (bacmp(&d->bdaddr, dst)) {
 504                                 hdev = d; break;
 505                         }
 506                 }
 507         }
 508
 509         if (hdev)
 510                 hdev = hci_dev_hold(hdev);
 511
 512         read_unlock(&hci_dev_list_lock);
 513         return hdev;
 514 }
 515 EXPORT_SYMBOL(hci_get_route);
 516
 517 /* This function requires the caller holds hdev->lock */
 518 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 519 {
 520         struct hci_dev *hdev = conn->hdev;
 521
 522         conn->state = BT_CLOSED;
 523
 524         mgmt_connect_failed(hdev, &conn->dst, conn->type, conn->dst_type,
 525                             status);
 526
 527         hci_proto_connect_cfm(conn, status);
 528
 529         hci_conn_del(conn);
 530 }
 531
 532 static void create_le_conn_complete(struct hci_dev *hdev, u8 status)
 533 {
 534         struct hci_conn *conn;
 535
 536         if (status == 0)
 537                 return;
 538
 539         BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
 540                status);
 541
 542         hci_dev_lock(hdev);
 543
 544         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 545         if (!conn)
 546                 goto done;
 547
 548         hci_le_conn_failed(conn, status);
 549
 550 done:
 551         hci_dev_unlock(hdev);
 552 }
 553
 554 static void hci_req_add_le_create_conn(struct hci_request *req,
 555                                        struct hci_conn *conn)
 556 {
 557         struct hci_cp_le_create_conn cp;
 558         struct hci_dev *hdev = conn->hdev;
 559         u8 own_addr_type;
 560
 561         memset(&cp, 0, sizeof(cp));
 562
 563         /* Update random address, but set require_privacy to false so
 564          * that we never connect with an unresolvable address.
 565          */
 566         if (hci_update_random_address(req, false, &own_addr_type))
 567                 return;
 568
 569         /* Save the address type used for this connnection attempt so we able
 570          * to retrieve this information if we need it.
 571          */
 572         conn->src_type = own_addr_type;
 573
 574         cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
 575         cp.scan_window = cpu_to_le16(hdev->le_scan_window);
 576         bacpy(&cp.peer_addr, &conn->dst);
 577         cp.peer_addr_type = conn->dst_type;
 578         cp.own_address_type = own_addr_type;
 579         cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 580         cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 581         cp.supervision_timeout = __constant_cpu_to_le16(0x002a);
 582         cp.min_ce_len = __constant_cpu_to_le16(0x0000);
 583         cp.max_ce_len = __constant_cpu_to_le16(0x0000);
 584
 585         hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 586 }
 587
 588 static void stop_scan_complete(struct hci_dev *hdev, u8 status)
 589 {
 590         struct hci_request req;
 591         struct hci_conn *conn;
 592         int err;
 593
 594         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 595         if (!conn)
 596                 return;
 597
 598         if (status) {
 599                 BT_DBG("HCI request failed to stop scanning: status 0x%2.2x",
 600                        status);
 601
 602                 hci_dev_lock(hdev);
 603                 hci_le_conn_failed(conn, status);
 604                 hci_dev_unlock(hdev);
 605                 return;
 606         }
 607
 608         /* Since we may have prematurely stopped discovery procedure, we should
 609          * update discovery state.
 610          */
 611         cancel_delayed_work(&hdev->le_scan_disable);
 612         hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
 613
 614         hci_req_init(&req, hdev);
 615
 616         hci_req_add_le_create_conn(&req, conn);
 617
 618         err = hci_req_run(&req, create_le_conn_complete);
 619         if (err) {
 620                 hci_dev_lock(hdev);
 621                 hci_le_conn_failed(conn, HCI_ERROR_MEMORY_EXCEEDED);
 622                 hci_dev_unlock(hdev);
 623                 return;
 624         }
 625 }
 626
 627 static struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 628                                     u8 dst_type, u8 sec_level, u8 auth_type)
 629 {
 630         struct hci_conn_params *params;
 631         struct hci_conn *conn;
 632         struct smp_irk *irk;
 633         struct hci_request req;
 634         int err;
 635
 636         if (test_bit(HCI_ADVERTISING, &hdev->flags))
 637                 return ERR_PTR(-ENOTSUPP);
 638
 639         /* Some devices send ATT messages as soon as the physical link is
 640          * established. To be able to handle these ATT messages, the user-
 641          * space first establishes the connection and then starts the pairing
 642          * process.
 643          *
 644          * So if a hci_conn object already exists for the following connection
 645          * attempt, we simply update pending_sec_level and auth_type fields
 646          * and return the object found.
 647          */
 648         conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
 649         if (conn) {
 650                 conn->pending_sec_level = sec_level;
 651                 conn->auth_type = auth_type;
 652                 goto done;
 653         }
 654
 655         /* Since the controller supports only one LE connection attempt at a
 656          * time, we return -EBUSY if there is any connection attempt running.
 657          */
 658         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 659         if (conn)
 660                 return ERR_PTR(-EBUSY);
 661
 662         /* Convert from L2CAP channel address type to HCI address type */
 663         if (dst_type == BDADDR_LE_PUBLIC)
 664                 dst_type = ADDR_LE_DEV_PUBLIC;
 665         else
 666                 dst_type = ADDR_LE_DEV_RANDOM;
 667
 668         /* When given an identity address with existing identity
 669          * resolving key, the connection needs to be established
 670          * to a resolvable random address.
 671          *
 672          * This uses the cached random resolvable address from
 673          * a previous scan. When no cached address is available,
 674          * try connecting to the identity address instead.
 675          *
 676          * Storing the resolvable random address is required here
 677          * to handle connection failures. The address will later
 678          * be resolved back into the original identity address
 679          * from the connect request.
 680          */
 681         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
 682         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
 683                 dst = &irk->rpa;
 684                 dst_type = ADDR_LE_DEV_RANDOM;
 685         }
 686
 687         conn = hci_conn_add(hdev, LE_LINK, dst);
 688         if (!conn)
 689                 return ERR_PTR(-ENOMEM);
 690
 691         conn->dst_type = dst_type;
 692
 693         conn->state = BT_CONNECT;
 694         conn->out = true;
 695         conn->link_mode |= HCI_LM_MASTER;
 696         conn->sec_level = BT_SECURITY_LOW;
 697         conn->pending_sec_level = sec_level;
 698         conn->auth_type = auth_type;
 699
 700         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 701         if (params) {
 702                 conn->le_conn_min_interval = params->conn_min_interval;
 703                 conn->le_conn_max_interval = params->conn_max_interval;
 704         } else {
 705                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
 706                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
 707         }
 708
 709         hci_req_init(&req, hdev);
 710
 711         /* If controller is scanning, we stop it since some controllers are
 712          * not able to scan and connect at the same time.
 713          */
 714         if (test_bit(HCI_LE_SCAN, &hdev->dev_flags)) {
 715                 hci_req_add_le_scan_disable(&req);
 716                 err = hci_req_run(&req, stop_scan_complete);
 717         } else {
 718                 hci_req_add_le_create_conn(&req, conn);
 719                 err = hci_req_run(&req, create_le_conn_complete);
 720         }
 721
 722         if (err) {
 723                 hci_conn_del(conn);
 724                 return ERR_PTR(err);
 725         }
 726
 727 done:
 728         hci_conn_hold(conn);
 729         return conn;
 730 }
 731
 732 static struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
 733                                                 u8 sec_level, u8 auth_type)
 734 {
 735         struct hci_conn *acl;
 736
 737         if (!test_bit(HCI_BREDR_ENABLED, &hdev->dev_flags))
 738                 return ERR_PTR(-ENOTSUPP);
 739
 740         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
 741         if (!acl) {
 742                 acl = hci_conn_add(hdev, ACL_LINK, dst);
 743                 if (!acl)
 744                         return ERR_PTR(-ENOMEM);
 745         }
 746
 747         hci_conn_hold(acl);
 748
 749         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
 750                 acl->sec_level = BT_SECURITY_LOW;
 751                 acl->pending_sec_level = sec_level;
 752                 acl->auth_type = auth_type;
 753                 hci_acl_create_connection(acl);
 754         }
 755
 756         return acl;
 757 }
 758
 759 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
 760                                  __u16 setting)
 761 {
 762         struct hci_conn *acl;
 763         struct hci_conn *sco;
 764
 765         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
 766         if (IS_ERR(acl))
 767                 return acl;
 768
 769         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
 770         if (!sco) {
 771                 sco = hci_conn_add(hdev, type, dst);
 772                 if (!sco) {
 773                         hci_conn_drop(acl);
 774                         return ERR_PTR(-ENOMEM);
 775                 }
 776         }
 777
 778         acl->link = sco;
 779         sco->link = acl;
 780
 781         hci_conn_hold(sco);
 782
 783         sco->setting = setting;
 784
 785         if (acl->state == BT_CONNECTED &&
 786             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 787                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
 788                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
 789
 790                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
 791                         /* defer SCO setup until mode change completed */
 792                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
 793                         return sco;
 794                 }
 795
 796                 hci_sco_setup(acl, 0x00);
 797         }
 798
 799         return sco;
 800 }
 801
 802 /* Create SCO, ACL or LE connection. */
 803 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst,
 804                              __u8 dst_type, __u8 sec_level, __u8 auth_type)
 805 {
 806         BT_DBG("%s dst %pMR type 0x%x", hdev->name, dst, type);
 807
 808         switch (type) {
 809         case LE_LINK:
 810                 return hci_connect_le(hdev, dst, dst_type, sec_level, auth_type);
 811         case ACL_LINK:
 812                 return hci_connect_acl(hdev, dst, sec_level, auth_type);
 813         }
 814
 815         return ERR_PTR(-EINVAL);
 816 }
 817
 818 /* Check link security requirement */
 819 int hci_conn_check_link_mode(struct hci_conn *conn)
 820 {
 821         BT_DBG("hcon %p", conn);
 822
 823         if (hci_conn_ssp_enabled(conn) && !(conn->link_mode & HCI_LM_ENCRYPT))
 824                 return 0;
 825
 826         return 1;
 827 }
 828
 829 /* Authenticate remote device */
 830 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 831 {
 832         BT_DBG("hcon %p", conn);
 833
 834         if (conn->pending_sec_level > sec_level)
 835                 sec_level = conn->pending_sec_level;
 836
 837         if (sec_level > conn->sec_level)
 838                 conn->pending_sec_level = sec_level;
 839         else if (conn->link_mode & HCI_LM_AUTH)
 840                 return 1;
 841
 842         /* Make sure we preserve an existing MITM requirement*/
 843         auth_type |= (conn->auth_type & 0x01);
 844
 845         conn->auth_type = auth_type;
 846
 847         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 848                 struct hci_cp_auth_requested cp;
 849
 850                 /* encrypt must be pending if auth is also pending */
 851                 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
 852
 853                 cp.handle = cpu_to_le16(conn->handle);
 854                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 855                              sizeof(cp), &cp);
 856                 if (conn->key_type != 0xff)
 857                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
 858         }
 859
 860         return 0;
 861 }
 862
 863 /* Encrypt the the link */
 864 static void hci_conn_encrypt(struct hci_conn *conn)
 865 {
 866         BT_DBG("hcon %p", conn);
 867
 868         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
 869                 struct hci_cp_set_conn_encrypt cp;
 870                 cp.handle  = cpu_to_le16(conn->handle);
 871                 cp.encrypt = 0x01;
 872                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
 873                              &cp);
 874         }
 875 }
 876
 877 /* Enable security */
 878 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 879 {
 880         BT_DBG("hcon %p", conn);
 881
 882         if (conn->type == LE_LINK)
 883                 return smp_conn_security(conn, sec_level);
 884
 885         /* For sdp we don't need the link key. */
 886         if (sec_level == BT_SECURITY_SDP)
 887                 return 1;
 888
 889         /* For non 2.1 devices and low security level we don't need the link
 890            key. */
 891         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
 892                 return 1;
 893
 894         /* For other security levels we need the link key. */
 895         if (!(conn->link_mode & HCI_LM_AUTH))
 896                 goto auth;
 897
 898         /* An authenticated FIPS approved combination key has sufficient
 899          * security for security level 4. */
 900         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
 901             sec_level == BT_SECURITY_FIPS)
 902                 goto encrypt;
 903
 904         /* An authenticated combination key has sufficient security for
 905            security level 3. */
 906         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
 907              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
 908             sec_level == BT_SECURITY_HIGH)
 909                 goto encrypt;
 910
 911         /* An unauthenticated combination key has sufficient security for
 912            security level 1 and 2. */
 913         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
 914              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
 915             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
 916                 goto encrypt;
 917
 918         /* A combination key has always sufficient security for the security
 919            levels 1 or 2. High security level requires the combination key
 920            is generated using maximum PIN code length (16).
 921            For pre 2.1 units. */
 922         if (conn->key_type == HCI_LK_COMBINATION &&
 923             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
 924              conn->pin_length == 16))
 925                 goto encrypt;
 926
 927 auth:
 928         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
 929                 return 0;
 930
 931         if (!hci_conn_auth(conn, sec_level, auth_type))
 932                 return 0;
 933
 934 encrypt:
 935         if (conn->link_mode & HCI_LM_ENCRYPT)
 936                 return 1;
 937
 938         hci_conn_encrypt(conn);
 939         return 0;
 940 }
 941 EXPORT_SYMBOL(hci_conn_security);
 942
 943 /* Check secure link requirement */
 944 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
 945 {
 946         BT_DBG("hcon %p", conn);
 947
 948         /* Accept if non-secure or higher security level is required */
 949         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
 950                 return 1;
 951
 952         /* Accept if secure or higher security level is already present */
 953         if (conn->sec_level == BT_SECURITY_HIGH ||
 954             conn->sec_level == BT_SECURITY_FIPS)
 955                 return 1;
 956
 957         /* Reject not secure link */
 958         return 0;
 959 }
 960 EXPORT_SYMBOL(hci_conn_check_secure);
 961
 962 /* Change link key */
 963 int hci_conn_change_link_key(struct hci_conn *conn)
 964 {
 965         BT_DBG("hcon %p", conn);
 966
 967         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 968                 struct hci_cp_change_conn_link_key cp;
 969                 cp.handle = cpu_to_le16(conn->handle);
 970                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 971                              sizeof(cp), &cp);
 972         }
 973
 974         return 0;
 975 }
 976
 977 /* Switch role */
 978 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
 979 {
 980         BT_DBG("hcon %p", conn);
 981
 982         if (!role && conn->link_mode & HCI_LM_MASTER)
 983                 return 1;
 984
 985         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
 986                 struct hci_cp_switch_role cp;
 987                 bacpy(&cp.bdaddr, &conn->dst);
 988                 cp.role = role;
 989                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 990         }
 991
 992         return 0;
 993 }
 994 EXPORT_SYMBOL(hci_conn_switch_role);
 995
 996 /* Enter active mode */
 997 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
 998 {
 999         struct hci_dev *hdev = conn->hdev;
1000
1001         BT_DBG("hcon %p mode %d", conn, conn->mode);
1002
1003         if (test_bit(HCI_RAW, &hdev->flags))
1004                 return;
1005
1006         if (conn->mode != HCI_CM_SNIFF)
1007                 goto timer;
1008
1009         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1010                 goto timer;
1011
1012         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1013                 struct hci_cp_exit_sniff_mode cp;
1014                 cp.handle = cpu_to_le16(conn->handle);
1015                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1016         }
1017
1018 timer:
1019         if (hdev->idle_timeout > 0)
1020                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1021                                    msecs_to_jiffies(hdev->idle_timeout));
1022 }
1023
1024 /* Drop all connection on the device */
1025 void hci_conn_hash_flush(struct hci_dev *hdev)
1026 {
1027         struct hci_conn_hash *h = &hdev->conn_hash;
1028         struct hci_conn *c, *n;
1029
1030         BT_DBG("hdev %s", hdev->name);
1031
1032         list_for_each_entry_safe(c, n, &h->list, list) {
1033                 c->state = BT_CLOSED;
1034
1035                 hci_proto_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1036                 hci_conn_del(c);
1037         }
1038 }
1039
1040 /* Check pending connect attempts */
1041 void hci_conn_check_pending(struct hci_dev *hdev)
1042 {
1043         struct hci_conn *conn;
1044
1045         BT_DBG("hdev %s", hdev->name);
1046
1047         hci_dev_lock(hdev);
1048
1049         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1050         if (conn)
1051                 hci_acl_create_connection(conn);
1052
1053         hci_dev_unlock(hdev);
1054 }
1055
1056 int hci_get_conn_list(void __user *arg)
1057 {
1058         struct hci_conn *c;
1059         struct hci_conn_list_req req, *cl;
1060         struct hci_conn_info *ci;
1061         struct hci_dev *hdev;
1062         int n = 0, size, err;
1063
1064         if (copy_from_user(&req, arg, sizeof(req)))
1065                 return -EFAULT;
1066
1067         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1068                 return -EINVAL;
1069
1070         size = sizeof(req) + req.conn_num * sizeof(*ci);
1071
1072         cl = kmalloc(size, GFP_KERNEL);
1073         if (!cl)
1074                 return -ENOMEM;
1075
1076         hdev = hci_dev_get(req.dev_id);
1077         if (!hdev) {
1078                 kfree(cl);
1079                 return -ENODEV;
1080         }
1081
1082         ci = cl->conn_info;
1083
1084         hci_dev_lock(hdev);
1085         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1086                 bacpy(&(ci + n)->bdaddr, &c->dst);
1087                 (ci + n)->handle = c->handle;
1088                 (ci + n)->type  = c->type;
1089                 (ci + n)->out   = c->out;
1090                 (ci + n)->state = c->state;
1091                 (ci + n)->link_mode = c->link_mode;
1092                 if (++n >= req.conn_num)
1093                         break;
1094         }
1095         hci_dev_unlock(hdev);
1096
1097         cl->dev_id = hdev->id;
1098         cl->conn_num = n;
1099         size = sizeof(req) + n * sizeof(*ci);
1100
1101         hci_dev_put(hdev);
1102
1103         err = copy_to_user(arg, cl, size);
1104         kfree(cl);
1105
1106         return err ? -EFAULT : 0;
1107 }
1108
1109 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1110 {
1111         struct hci_conn_info_req req;
1112         struct hci_conn_info ci;
1113         struct hci_conn *conn;
1114         char __user *ptr = arg + sizeof(req);
1115
1116         if (copy_from_user(&req, arg, sizeof(req)))
1117                 return -EFAULT;
1118
1119         hci_dev_lock(hdev);
1120         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1121         if (conn) {
1122                 bacpy(&ci.bdaddr, &conn->dst);
1123                 ci.handle = conn->handle;
1124                 ci.type  = conn->type;
1125                 ci.out   = conn->out;
1126                 ci.state = conn->state;
1127                 ci.link_mode = conn->link_mode;
1128         }
1129         hci_dev_unlock(hdev);
1130
1131         if (!conn)
1132                 return -ENOENT;
1133
1134         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1135 }
1136
1137 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1138 {
1139         struct hci_auth_info_req req;
1140         struct hci_conn *conn;
1141
1142         if (copy_from_user(&req, arg, sizeof(req)))
1143                 return -EFAULT;
1144
1145         hci_dev_lock(hdev);
1146         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1147         if (conn)
1148                 req.type = conn->auth_type;
1149         hci_dev_unlock(hdev);
1150
1151         if (!conn)
1152                 return -ENOENT;
1153
1154         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1155 }
1156
1157 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1158 {
1159         struct hci_dev *hdev = conn->hdev;
1160         struct hci_chan *chan;
1161
1162         BT_DBG("%s hcon %p", hdev->name, conn);
1163
1164         chan = kzalloc(sizeof(struct hci_chan), GFP_KERNEL);
1165         if (!chan)
1166                 return NULL;
1167
1168         chan->conn = conn;
1169         skb_queue_head_init(&chan->data_q);
1170         chan->state = BT_CONNECTED;
1171
1172         list_add_rcu(&chan->list, &conn->chan_list);
1173
1174         return chan;
1175 }
1176
1177 void hci_chan_del(struct hci_chan *chan)
1178 {
1179         struct hci_conn *conn = chan->conn;
1180         struct hci_dev *hdev = conn->hdev;
1181
1182         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1183
1184         list_del_rcu(&chan->list);
1185
1186         synchronize_rcu();
1187
1188         hci_conn_drop(conn);
1189
1190         skb_queue_purge(&chan->data_q);
1191         kfree(chan);
1192 }
1193
1194 void hci_chan_list_flush(struct hci_conn *conn)
1195 {
1196         struct hci_chan *chan, *n;
1197
1198         BT_DBG("hcon %p", conn);
1199
1200         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1201                 hci_chan_del(chan);
1202 }
1203
1204 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1205                                                  __u16 handle)
1206 {
1207         struct hci_chan *hchan;
1208
1209         list_for_each_entry(hchan, &hcon->chan_list, list) {
1210                 if (hchan->handle == handle)
1211                         return hchan;
1212         }
1213
1214         return NULL;
1215 }
1216
1217 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1218 {
1219         struct hci_conn_hash *h = &hdev->conn_hash;
1220         struct hci_conn *hcon;
1221         struct hci_chan *hchan = NULL;
1222
1223         rcu_read_lock();
1224
1225         list_for_each_entry_rcu(hcon, &h->list, list) {
1226                 hchan = __hci_chan_lookup_handle(hcon, handle);
1227                 if (hchan)
1228                         break;
1229         }
1230
1231         rcu_read_unlock();
1232
1233         return hchan;
1234 }