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(0x0001);
 229         cp.max_ce_len           = __constant_cpu_to_le16(0x0001);
 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 static void create_le_conn_complete(struct hci_dev *hdev, u8 status)
 518 {
 519         struct hci_conn *conn;
 520
 521         if (status == 0)
 522                 return;
 523
 524         BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
 525                status);
 526
 527         hci_dev_lock(hdev);
 528
 529         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 530         if (!conn)
 531                 goto done;
 532
 533         conn->state = BT_CLOSED;
 534
 535         mgmt_connect_failed(hdev, &conn->dst, conn->type, conn->dst_type,
 536                             status);
 537
 538         hci_proto_connect_cfm(conn, status);
 539
 540         hci_conn_del(conn);
 541
 542 done:
 543         hci_dev_unlock(hdev);
 544 }
 545
 546 static int hci_create_le_conn(struct hci_conn *conn)
 547 {
 548         struct hci_dev *hdev = conn->hdev;
 549         struct hci_cp_le_create_conn cp;
 550         struct hci_request req;
 551         int err;
 552
 553         hci_req_init(&req, hdev);
 554
 555         memset(&cp, 0, sizeof(cp));
 556         cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
 557         cp.scan_window = cpu_to_le16(hdev->le_scan_window);
 558         bacpy(&cp.peer_addr, &conn->dst);
 559         cp.peer_addr_type = conn->dst_type;
 560         cp.own_address_type = conn->src_type;
 561         cp.conn_interval_min = cpu_to_le16(hdev->le_conn_min_interval);
 562         cp.conn_interval_max = cpu_to_le16(hdev->le_conn_max_interval);
 563         cp.supervision_timeout = __constant_cpu_to_le16(0x002a);
 564         cp.min_ce_len = __constant_cpu_to_le16(0x0000);
 565         cp.max_ce_len = __constant_cpu_to_le16(0x0000);
 566
 567         hci_req_add(&req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 568
 569         err = hci_req_run(&req, create_le_conn_complete);
 570         if (err) {
 571                 hci_conn_del(conn);
 572                 return err;
 573         }
 574
 575         return 0;
 576 }
 577
 578 static struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 579                                     u8 dst_type, u8 sec_level, u8 auth_type)
 580 {
 581         struct hci_conn *conn;
 582         int err;
 583
 584         if (test_bit(HCI_ADVERTISING, &hdev->flags))
 585                 return ERR_PTR(-ENOTSUPP);
 586
 587         /* Some devices send ATT messages as soon as the physical link is
 588          * established. To be able to handle these ATT messages, the user-
 589          * space first establishes the connection and then starts the pairing
 590          * process.
 591          *
 592          * So if a hci_conn object already exists for the following connection
 593          * attempt, we simply update pending_sec_level and auth_type fields
 594          * and return the object found.
 595          */
 596         conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
 597         if (conn) {
 598                 conn->pending_sec_level = sec_level;
 599                 conn->auth_type = auth_type;
 600                 goto done;
 601         }
 602
 603         /* Since the controller supports only one LE connection attempt at a
 604          * time, we return -EBUSY if there is any connection attempt running.
 605          */
 606         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 607         if (conn)
 608                 return ERR_PTR(-EBUSY);
 609
 610         conn = hci_conn_add(hdev, LE_LINK, dst);
 611         if (!conn)
 612                 return ERR_PTR(-ENOMEM);
 613
 614         if (dst_type == BDADDR_LE_PUBLIC)
 615                 conn->dst_type = ADDR_LE_DEV_PUBLIC;
 616         else
 617                 conn->dst_type = ADDR_LE_DEV_RANDOM;
 618
 619         conn->src_type = hdev->own_addr_type;
 620
 621         conn->state = BT_CONNECT;
 622         conn->out = true;
 623         conn->link_mode |= HCI_LM_MASTER;
 624         conn->sec_level = BT_SECURITY_LOW;
 625         conn->pending_sec_level = sec_level;
 626         conn->auth_type = auth_type;
 627
 628         err = hci_create_le_conn(conn);
 629         if (err)
 630                 return ERR_PTR(err);
 631
 632 done:
 633         hci_conn_hold(conn);
 634         return conn;
 635 }
 636
 637 static struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
 638                                                 u8 sec_level, u8 auth_type)
 639 {
 640         struct hci_conn *acl;
 641
 642         if (!test_bit(HCI_BREDR_ENABLED, &hdev->dev_flags))
 643                 return ERR_PTR(-ENOTSUPP);
 644
 645         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
 646         if (!acl) {
 647                 acl = hci_conn_add(hdev, ACL_LINK, dst);
 648                 if (!acl)
 649                         return ERR_PTR(-ENOMEM);
 650         }
 651
 652         hci_conn_hold(acl);
 653
 654         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
 655                 acl->sec_level = BT_SECURITY_LOW;
 656                 acl->pending_sec_level = sec_level;
 657                 acl->auth_type = auth_type;
 658                 hci_acl_create_connection(acl);
 659         }
 660
 661         return acl;
 662 }
 663
 664 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
 665                                  __u16 setting)
 666 {
 667         struct hci_conn *acl;
 668         struct hci_conn *sco;
 669
 670         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
 671         if (IS_ERR(acl))
 672                 return acl;
 673
 674         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
 675         if (!sco) {
 676                 sco = hci_conn_add(hdev, type, dst);
 677                 if (!sco) {
 678                         hci_conn_drop(acl);
 679                         return ERR_PTR(-ENOMEM);
 680                 }
 681         }
 682
 683         acl->link = sco;
 684         sco->link = acl;
 685
 686         hci_conn_hold(sco);
 687
 688         sco->setting = setting;
 689
 690         if (acl->state == BT_CONNECTED &&
 691             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 692                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
 693                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
 694
 695                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
 696                         /* defer SCO setup until mode change completed */
 697                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
 698                         return sco;
 699                 }
 700
 701                 hci_sco_setup(acl, 0x00);
 702         }
 703
 704         return sco;
 705 }
 706
 707 /* Create SCO, ACL or LE connection. */
 708 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst,
 709                              __u8 dst_type, __u8 sec_level, __u8 auth_type)
 710 {
 711         BT_DBG("%s dst %pMR type 0x%x", hdev->name, dst, type);
 712
 713         switch (type) {
 714         case LE_LINK:
 715                 return hci_connect_le(hdev, dst, dst_type, sec_level, auth_type);
 716         case ACL_LINK:
 717                 return hci_connect_acl(hdev, dst, sec_level, auth_type);
 718         }
 719
 720         return ERR_PTR(-EINVAL);
 721 }
 722
 723 /* Check link security requirement */
 724 int hci_conn_check_link_mode(struct hci_conn *conn)
 725 {
 726         BT_DBG("hcon %p", conn);
 727
 728         if (hci_conn_ssp_enabled(conn) && !(conn->link_mode & HCI_LM_ENCRYPT))
 729                 return 0;
 730
 731         return 1;
 732 }
 733
 734 /* Authenticate remote device */
 735 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 736 {
 737         BT_DBG("hcon %p", conn);
 738
 739         if (conn->pending_sec_level > sec_level)
 740                 sec_level = conn->pending_sec_level;
 741
 742         if (sec_level > conn->sec_level)
 743                 conn->pending_sec_level = sec_level;
 744         else if (conn->link_mode & HCI_LM_AUTH)
 745                 return 1;
 746
 747         /* Make sure we preserve an existing MITM requirement*/
 748         auth_type |= (conn->auth_type & 0x01);
 749
 750         conn->auth_type = auth_type;
 751
 752         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 753                 struct hci_cp_auth_requested cp;
 754
 755                 /* encrypt must be pending if auth is also pending */
 756                 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
 757
 758                 cp.handle = cpu_to_le16(conn->handle);
 759                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 760                              sizeof(cp), &cp);
 761                 if (conn->key_type != 0xff)
 762                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
 763         }
 764
 765         return 0;
 766 }
 767
 768 /* Encrypt the the link */
 769 static void hci_conn_encrypt(struct hci_conn *conn)
 770 {
 771         BT_DBG("hcon %p", conn);
 772
 773         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
 774                 struct hci_cp_set_conn_encrypt cp;
 775                 cp.handle  = cpu_to_le16(conn->handle);
 776                 cp.encrypt = 0x01;
 777                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
 778                              &cp);
 779         }
 780 }
 781
 782 /* Enable security */
 783 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 784 {
 785         BT_DBG("hcon %p", conn);
 786
 787         if (conn->type == LE_LINK)
 788                 return smp_conn_security(conn, sec_level);
 789
 790         /* For sdp we don't need the link key. */
 791         if (sec_level == BT_SECURITY_SDP)
 792                 return 1;
 793
 794         /* For non 2.1 devices and low security level we don't need the link
 795            key. */
 796         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
 797                 return 1;
 798
 799         /* For other security levels we need the link key. */
 800         if (!(conn->link_mode & HCI_LM_AUTH))
 801                 goto auth;
 802
 803         /* An authenticated FIPS approved combination key has sufficient
 804          * security for security level 4. */
 805         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
 806             sec_level == BT_SECURITY_FIPS)
 807                 goto encrypt;
 808
 809         /* An authenticated combination key has sufficient security for
 810            security level 3. */
 811         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
 812              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
 813             sec_level == BT_SECURITY_HIGH)
 814                 goto encrypt;
 815
 816         /* An unauthenticated combination key has sufficient security for
 817            security level 1 and 2. */
 818         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
 819              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
 820             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
 821                 goto encrypt;
 822
 823         /* A combination key has always sufficient security for the security
 824            levels 1 or 2. High security level requires the combination key
 825            is generated using maximum PIN code length (16).
 826            For pre 2.1 units. */
 827         if (conn->key_type == HCI_LK_COMBINATION &&
 828             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
 829              conn->pin_length == 16))
 830                 goto encrypt;
 831
 832 auth:
 833         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
 834                 return 0;
 835
 836         if (!hci_conn_auth(conn, sec_level, auth_type))
 837                 return 0;
 838
 839 encrypt:
 840         if (conn->link_mode & HCI_LM_ENCRYPT)
 841                 return 1;
 842
 843         hci_conn_encrypt(conn);
 844         return 0;
 845 }
 846 EXPORT_SYMBOL(hci_conn_security);
 847
 848 /* Check secure link requirement */
 849 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
 850 {
 851         BT_DBG("hcon %p", conn);
 852
 853         if (sec_level != BT_SECURITY_HIGH)
 854                 return 1; /* Accept if non-secure is required */
 855
 856         if (conn->sec_level == BT_SECURITY_HIGH)
 857                 return 1;
 858
 859         return 0; /* Reject not secure link */
 860 }
 861 EXPORT_SYMBOL(hci_conn_check_secure);
 862
 863 /* Change link key */
 864 int hci_conn_change_link_key(struct hci_conn *conn)
 865 {
 866         BT_DBG("hcon %p", conn);
 867
 868         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 869                 struct hci_cp_change_conn_link_key cp;
 870                 cp.handle = cpu_to_le16(conn->handle);
 871                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 872                              sizeof(cp), &cp);
 873         }
 874
 875         return 0;
 876 }
 877
 878 /* Switch role */
 879 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
 880 {
 881         BT_DBG("hcon %p", conn);
 882
 883         if (!role && conn->link_mode & HCI_LM_MASTER)
 884                 return 1;
 885
 886         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
 887                 struct hci_cp_switch_role cp;
 888                 bacpy(&cp.bdaddr, &conn->dst);
 889                 cp.role = role;
 890                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 891         }
 892
 893         return 0;
 894 }
 895 EXPORT_SYMBOL(hci_conn_switch_role);
 896
 897 /* Enter active mode */
 898 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
 899 {
 900         struct hci_dev *hdev = conn->hdev;
 901
 902         BT_DBG("hcon %p mode %d", conn, conn->mode);
 903
 904         if (test_bit(HCI_RAW, &hdev->flags))
 905                 return;
 906
 907         if (conn->mode != HCI_CM_SNIFF)
 908                 goto timer;
 909
 910         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
 911                 goto timer;
 912
 913         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 914                 struct hci_cp_exit_sniff_mode cp;
 915                 cp.handle = cpu_to_le16(conn->handle);
 916                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 917         }
 918
 919 timer:
 920         if (hdev->idle_timeout > 0)
 921                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
 922                                    msecs_to_jiffies(hdev->idle_timeout));
 923 }
 924
 925 /* Drop all connection on the device */
 926 void hci_conn_hash_flush(struct hci_dev *hdev)
 927 {
 928         struct hci_conn_hash *h = &hdev->conn_hash;
 929         struct hci_conn *c, *n;
 930
 931         BT_DBG("hdev %s", hdev->name);
 932
 933         list_for_each_entry_safe(c, n, &h->list, list) {
 934                 c->state = BT_CLOSED;
 935
 936                 hci_proto_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
 937                 hci_conn_del(c);
 938         }
 939 }
 940
 941 /* Check pending connect attempts */
 942 void hci_conn_check_pending(struct hci_dev *hdev)
 943 {
 944         struct hci_conn *conn;
 945
 946         BT_DBG("hdev %s", hdev->name);
 947
 948         hci_dev_lock(hdev);
 949
 950         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
 951         if (conn)
 952                 hci_acl_create_connection(conn);
 953
 954         hci_dev_unlock(hdev);
 955 }
 956
 957 int hci_get_conn_list(void __user *arg)
 958 {
 959         struct hci_conn *c;
 960         struct hci_conn_list_req req, *cl;
 961         struct hci_conn_info *ci;
 962         struct hci_dev *hdev;
 963         int n = 0, size, err;
 964
 965         if (copy_from_user(&req, arg, sizeof(req)))
 966                 return -EFAULT;
 967
 968         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
 969                 return -EINVAL;
 970
 971         size = sizeof(req) + req.conn_num * sizeof(*ci);
 972
 973         cl = kmalloc(size, GFP_KERNEL);
 974         if (!cl)
 975                 return -ENOMEM;
 976
 977         hdev = hci_dev_get(req.dev_id);
 978         if (!hdev) {
 979                 kfree(cl);
 980                 return -ENODEV;
 981         }
 982
 983         ci = cl->conn_info;
 984
 985         hci_dev_lock(hdev);
 986         list_for_each_entry(c, &hdev->conn_hash.list, list) {
 987                 bacpy(&(ci + n)->bdaddr, &c->dst);
 988                 (ci + n)->handle = c->handle;
 989                 (ci + n)->type  = c->type;
 990                 (ci + n)->out   = c->out;
 991                 (ci + n)->state = c->state;
 992                 (ci + n)->link_mode = c->link_mode;
 993                 if (++n >= req.conn_num)
 994                         break;
 995         }
 996         hci_dev_unlock(hdev);
 997
 998         cl->dev_id = hdev->id;
 999         cl->conn_num = n;
1000         size = sizeof(req) + n * sizeof(*ci);
1001
1002         hci_dev_put(hdev);
1003
1004         err = copy_to_user(arg, cl, size);
1005         kfree(cl);
1006
1007         return err ? -EFAULT : 0;
1008 }
1009
1010 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1011 {
1012         struct hci_conn_info_req req;
1013         struct hci_conn_info ci;
1014         struct hci_conn *conn;
1015         char __user *ptr = arg + sizeof(req);
1016
1017         if (copy_from_user(&req, arg, sizeof(req)))
1018                 return -EFAULT;
1019
1020         hci_dev_lock(hdev);
1021         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1022         if (conn) {
1023                 bacpy(&ci.bdaddr, &conn->dst);
1024                 ci.handle = conn->handle;
1025                 ci.type  = conn->type;
1026                 ci.out   = conn->out;
1027                 ci.state = conn->state;
1028                 ci.link_mode = conn->link_mode;
1029         }
1030         hci_dev_unlock(hdev);
1031
1032         if (!conn)
1033                 return -ENOENT;
1034
1035         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1036 }
1037
1038 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1039 {
1040         struct hci_auth_info_req req;
1041         struct hci_conn *conn;
1042
1043         if (copy_from_user(&req, arg, sizeof(req)))
1044                 return -EFAULT;
1045
1046         hci_dev_lock(hdev);
1047         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1048         if (conn)
1049                 req.type = conn->auth_type;
1050         hci_dev_unlock(hdev);
1051
1052         if (!conn)
1053                 return -ENOENT;
1054
1055         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1056 }
1057
1058 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1059 {
1060         struct hci_dev *hdev = conn->hdev;
1061         struct hci_chan *chan;
1062
1063         BT_DBG("%s hcon %p", hdev->name, conn);
1064
1065         chan = kzalloc(sizeof(struct hci_chan), GFP_KERNEL);
1066         if (!chan)
1067                 return NULL;
1068
1069         chan->conn = conn;
1070         skb_queue_head_init(&chan->data_q);
1071         chan->state = BT_CONNECTED;
1072
1073         list_add_rcu(&chan->list, &conn->chan_list);
1074
1075         return chan;
1076 }
1077
1078 void hci_chan_del(struct hci_chan *chan)
1079 {
1080         struct hci_conn *conn = chan->conn;
1081         struct hci_dev *hdev = conn->hdev;
1082
1083         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1084
1085         list_del_rcu(&chan->list);
1086
1087         synchronize_rcu();
1088
1089         hci_conn_drop(conn);
1090
1091         skb_queue_purge(&chan->data_q);
1092         kfree(chan);
1093 }
1094
1095 void hci_chan_list_flush(struct hci_conn *conn)
1096 {
1097         struct hci_chan *chan, *n;
1098
1099         BT_DBG("hcon %p", conn);
1100
1101         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1102                 hci_chan_del(chan);
1103 }
1104
1105 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1106                                                  __u16 handle)
1107 {
1108         struct hci_chan *hchan;
1109
1110         list_for_each_entry(hchan, &hcon->chan_list, list) {
1111                 if (hchan->handle == handle)
1112                         return hchan;
1113         }
1114
1115         return NULL;
1116 }
1117
1118 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1119 {
1120         struct hci_conn_hash *h = &hdev->conn_hash;
1121         struct hci_conn *hcon;
1122         struct hci_chan *hchan = NULL;
1123
1124         rcu_read_lock();
1125
1126         list_for_each_entry_rcu(hcon, &h->list, list) {
1127                 hchan = __hci_chan_lookup_handle(hcon, handle);
1128                 if (hchan)
1129                         break;
1130         }
1131
1132         rcu_read_unlock();
1133
1134         return hchan;
1135 }