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 /* This function requires the caller holds hdev->lock */
 518 static void 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         le_conn_failed(conn, status);
 549
 550 done:
 551         hci_dev_unlock(hdev);
 552 }
 553
 554 static int hci_create_le_conn(struct hci_conn *conn)
 555 {
 556         struct hci_dev *hdev = conn->hdev;
 557         struct hci_cp_le_create_conn cp;
 558         struct hci_request req;
 559         int err;
 560
 561         hci_req_init(&req, hdev);
 562
 563         memset(&cp, 0, sizeof(cp));
 564         cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
 565         cp.scan_window = cpu_to_le16(hdev->le_scan_window);
 566         bacpy(&cp.peer_addr, &conn->dst);
 567         cp.peer_addr_type = conn->dst_type;
 568         cp.own_address_type = conn->src_type;
 569         cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 570         cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 571         cp.supervision_timeout = __constant_cpu_to_le16(0x002a);
 572         cp.min_ce_len = __constant_cpu_to_le16(0x0000);
 573         cp.max_ce_len = __constant_cpu_to_le16(0x0000);
 574
 575         hci_req_add(&req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 576
 577         err = hci_req_run(&req, create_le_conn_complete);
 578         if (err) {
 579                 hci_conn_del(conn);
 580                 return err;
 581         }
 582
 583         return 0;
 584 }
 585
 586 static struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 587                                     u8 dst_type, u8 sec_level, u8 auth_type)
 588 {
 589         struct hci_conn_params *params;
 590         struct hci_conn *conn;
 591         struct smp_irk *irk;
 592         int err;
 593
 594         if (test_bit(HCI_ADVERTISING, &hdev->flags))
 595                 return ERR_PTR(-ENOTSUPP);
 596
 597         /* Some devices send ATT messages as soon as the physical link is
 598          * established. To be able to handle these ATT messages, the user-
 599          * space first establishes the connection and then starts the pairing
 600          * process.
 601          *
 602          * So if a hci_conn object already exists for the following connection
 603          * attempt, we simply update pending_sec_level and auth_type fields
 604          * and return the object found.
 605          */
 606         conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
 607         if (conn) {
 608                 conn->pending_sec_level = sec_level;
 609                 conn->auth_type = auth_type;
 610                 goto done;
 611         }
 612
 613         /* Since the controller supports only one LE connection attempt at a
 614          * time, we return -EBUSY if there is any connection attempt running.
 615          */
 616         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 617         if (conn)
 618                 return ERR_PTR(-EBUSY);
 619
 620         /* Convert from L2CAP channel address type to HCI address type */
 621         if (dst_type == BDADDR_LE_PUBLIC)
 622                 dst_type = ADDR_LE_DEV_PUBLIC;
 623         else
 624                 dst_type = ADDR_LE_DEV_RANDOM;
 625
 626         /* When given an identity address with existing identity
 627          * resolving key, the connection needs to be established
 628          * to a resolvable random address.
 629          *
 630          * This uses the cached random resolvable address from
 631          * a previous scan. When no cached address is available,
 632          * try connecting to the identity address instead.
 633          *
 634          * Storing the resolvable random address is required here
 635          * to handle connection failures. The address will later
 636          * be resolved back into the original identity address
 637          * from the connect request.
 638          */
 639         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
 640         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
 641                 dst = &irk->rpa;
 642                 dst_type = ADDR_LE_DEV_RANDOM;
 643         }
 644
 645         conn = hci_conn_add(hdev, LE_LINK, dst);
 646         if (!conn)
 647                 return ERR_PTR(-ENOMEM);
 648
 649         conn->dst_type = dst_type;
 650         conn->src_type = hdev->own_addr_type;
 651
 652         conn->state = BT_CONNECT;
 653         conn->out = true;
 654         conn->link_mode |= HCI_LM_MASTER;
 655         conn->sec_level = BT_SECURITY_LOW;
 656         conn->pending_sec_level = sec_level;
 657         conn->auth_type = auth_type;
 658
 659         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 660         if (params) {
 661                 conn->le_conn_min_interval = params->conn_min_interval;
 662                 conn->le_conn_max_interval = params->conn_max_interval;
 663         } else {
 664                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
 665                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
 666         }
 667
 668         err = hci_create_le_conn(conn);
 669         if (err)
 670                 return ERR_PTR(err);
 671
 672 done:
 673         hci_conn_hold(conn);
 674         return conn;
 675 }
 676
 677 static struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
 678                                                 u8 sec_level, u8 auth_type)
 679 {
 680         struct hci_conn *acl;
 681
 682         if (!test_bit(HCI_BREDR_ENABLED, &hdev->dev_flags))
 683                 return ERR_PTR(-ENOTSUPP);
 684
 685         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
 686         if (!acl) {
 687                 acl = hci_conn_add(hdev, ACL_LINK, dst);
 688                 if (!acl)
 689                         return ERR_PTR(-ENOMEM);
 690         }
 691
 692         hci_conn_hold(acl);
 693
 694         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
 695                 acl->sec_level = BT_SECURITY_LOW;
 696                 acl->pending_sec_level = sec_level;
 697                 acl->auth_type = auth_type;
 698                 hci_acl_create_connection(acl);
 699         }
 700
 701         return acl;
 702 }
 703
 704 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
 705                                  __u16 setting)
 706 {
 707         struct hci_conn *acl;
 708         struct hci_conn *sco;
 709
 710         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
 711         if (IS_ERR(acl))
 712                 return acl;
 713
 714         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
 715         if (!sco) {
 716                 sco = hci_conn_add(hdev, type, dst);
 717                 if (!sco) {
 718                         hci_conn_drop(acl);
 719                         return ERR_PTR(-ENOMEM);
 720                 }
 721         }
 722
 723         acl->link = sco;
 724         sco->link = acl;
 725
 726         hci_conn_hold(sco);
 727
 728         sco->setting = setting;
 729
 730         if (acl->state == BT_CONNECTED &&
 731             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 732                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
 733                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
 734
 735                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
 736                         /* defer SCO setup until mode change completed */
 737                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
 738                         return sco;
 739                 }
 740
 741                 hci_sco_setup(acl, 0x00);
 742         }
 743
 744         return sco;
 745 }
 746
 747 /* Create SCO, ACL or LE connection. */
 748 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst,
 749                              __u8 dst_type, __u8 sec_level, __u8 auth_type)
 750 {
 751         BT_DBG("%s dst %pMR type 0x%x", hdev->name, dst, type);
 752
 753         switch (type) {
 754         case LE_LINK:
 755                 return hci_connect_le(hdev, dst, dst_type, sec_level, auth_type);
 756         case ACL_LINK:
 757                 return hci_connect_acl(hdev, dst, sec_level, auth_type);
 758         }
 759
 760         return ERR_PTR(-EINVAL);
 761 }
 762
 763 /* Check link security requirement */
 764 int hci_conn_check_link_mode(struct hci_conn *conn)
 765 {
 766         BT_DBG("hcon %p", conn);
 767
 768         if (hci_conn_ssp_enabled(conn) && !(conn->link_mode & HCI_LM_ENCRYPT))
 769                 return 0;
 770
 771         return 1;
 772 }
 773
 774 /* Authenticate remote device */
 775 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 776 {
 777         BT_DBG("hcon %p", conn);
 778
 779         if (conn->pending_sec_level > sec_level)
 780                 sec_level = conn->pending_sec_level;
 781
 782         if (sec_level > conn->sec_level)
 783                 conn->pending_sec_level = sec_level;
 784         else if (conn->link_mode & HCI_LM_AUTH)
 785                 return 1;
 786
 787         /* Make sure we preserve an existing MITM requirement*/
 788         auth_type |= (conn->auth_type & 0x01);
 789
 790         conn->auth_type = auth_type;
 791
 792         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 793                 struct hci_cp_auth_requested cp;
 794
 795                 /* encrypt must be pending if auth is also pending */
 796                 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
 797
 798                 cp.handle = cpu_to_le16(conn->handle);
 799                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 800                              sizeof(cp), &cp);
 801                 if (conn->key_type != 0xff)
 802                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
 803         }
 804
 805         return 0;
 806 }
 807
 808 /* Encrypt the the link */
 809 static void hci_conn_encrypt(struct hci_conn *conn)
 810 {
 811         BT_DBG("hcon %p", conn);
 812
 813         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
 814                 struct hci_cp_set_conn_encrypt cp;
 815                 cp.handle  = cpu_to_le16(conn->handle);
 816                 cp.encrypt = 0x01;
 817                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
 818                              &cp);
 819         }
 820 }
 821
 822 /* Enable security */
 823 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 824 {
 825         BT_DBG("hcon %p", conn);
 826
 827         if (conn->type == LE_LINK)
 828                 return smp_conn_security(conn, sec_level);
 829
 830         /* For sdp we don't need the link key. */
 831         if (sec_level == BT_SECURITY_SDP)
 832                 return 1;
 833
 834         /* For non 2.1 devices and low security level we don't need the link
 835            key. */
 836         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
 837                 return 1;
 838
 839         /* For other security levels we need the link key. */
 840         if (!(conn->link_mode & HCI_LM_AUTH))
 841                 goto auth;
 842
 843         /* An authenticated FIPS approved combination key has sufficient
 844          * security for security level 4. */
 845         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
 846             sec_level == BT_SECURITY_FIPS)
 847                 goto encrypt;
 848
 849         /* An authenticated combination key has sufficient security for
 850            security level 3. */
 851         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
 852              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
 853             sec_level == BT_SECURITY_HIGH)
 854                 goto encrypt;
 855
 856         /* An unauthenticated combination key has sufficient security for
 857            security level 1 and 2. */
 858         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
 859              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
 860             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
 861                 goto encrypt;
 862
 863         /* A combination key has always sufficient security for the security
 864            levels 1 or 2. High security level requires the combination key
 865            is generated using maximum PIN code length (16).
 866            For pre 2.1 units. */
 867         if (conn->key_type == HCI_LK_COMBINATION &&
 868             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
 869              conn->pin_length == 16))
 870                 goto encrypt;
 871
 872 auth:
 873         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
 874                 return 0;
 875
 876         if (!hci_conn_auth(conn, sec_level, auth_type))
 877                 return 0;
 878
 879 encrypt:
 880         if (conn->link_mode & HCI_LM_ENCRYPT)
 881                 return 1;
 882
 883         hci_conn_encrypt(conn);
 884         return 0;
 885 }
 886 EXPORT_SYMBOL(hci_conn_security);
 887
 888 /* Check secure link requirement */
 889 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
 890 {
 891         BT_DBG("hcon %p", conn);
 892
 893         /* Accept if non-secure or higher security level is required */
 894         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
 895                 return 1;
 896
 897         /* Accept if secure or higher security level is already present */
 898         if (conn->sec_level == BT_SECURITY_HIGH ||
 899             conn->sec_level == BT_SECURITY_FIPS)
 900                 return 1;
 901
 902         /* Reject not secure link */
 903         return 0;
 904 }
 905 EXPORT_SYMBOL(hci_conn_check_secure);
 906
 907 /* Change link key */
 908 int hci_conn_change_link_key(struct hci_conn *conn)
 909 {
 910         BT_DBG("hcon %p", conn);
 911
 912         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 913                 struct hci_cp_change_conn_link_key cp;
 914                 cp.handle = cpu_to_le16(conn->handle);
 915                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 916                              sizeof(cp), &cp);
 917         }
 918
 919         return 0;
 920 }
 921
 922 /* Switch role */
 923 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
 924 {
 925         BT_DBG("hcon %p", conn);
 926
 927         if (!role && conn->link_mode & HCI_LM_MASTER)
 928                 return 1;
 929
 930         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
 931                 struct hci_cp_switch_role cp;
 932                 bacpy(&cp.bdaddr, &conn->dst);
 933                 cp.role = role;
 934                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 935         }
 936
 937         return 0;
 938 }
 939 EXPORT_SYMBOL(hci_conn_switch_role);
 940
 941 /* Enter active mode */
 942 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
 943 {
 944         struct hci_dev *hdev = conn->hdev;
 945
 946         BT_DBG("hcon %p mode %d", conn, conn->mode);
 947
 948         if (test_bit(HCI_RAW, &hdev->flags))
 949                 return;
 950
 951         if (conn->mode != HCI_CM_SNIFF)
 952                 goto timer;
 953
 954         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
 955                 goto timer;
 956
 957         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 958                 struct hci_cp_exit_sniff_mode cp;
 959                 cp.handle = cpu_to_le16(conn->handle);
 960                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 961         }
 962
 963 timer:
 964         if (hdev->idle_timeout > 0)
 965                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
 966                                    msecs_to_jiffies(hdev->idle_timeout));
 967 }
 968
 969 /* Drop all connection on the device */
 970 void hci_conn_hash_flush(struct hci_dev *hdev)
 971 {
 972         struct hci_conn_hash *h = &hdev->conn_hash;
 973         struct hci_conn *c, *n;
 974
 975         BT_DBG("hdev %s", hdev->name);
 976
 977         list_for_each_entry_safe(c, n, &h->list, list) {
 978                 c->state = BT_CLOSED;
 979
 980                 hci_proto_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
 981                 hci_conn_del(c);
 982         }
 983 }
 984
 985 /* Check pending connect attempts */
 986 void hci_conn_check_pending(struct hci_dev *hdev)
 987 {
 988         struct hci_conn *conn;
 989
 990         BT_DBG("hdev %s", hdev->name);
 991
 992         hci_dev_lock(hdev);
 993
 994         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
 995         if (conn)
 996                 hci_acl_create_connection(conn);
 997
 998         hci_dev_unlock(hdev);
 999 }
1000
1001 int hci_get_conn_list(void __user *arg)
1002 {
1003         struct hci_conn *c;
1004         struct hci_conn_list_req req, *cl;
1005         struct hci_conn_info *ci;
1006         struct hci_dev *hdev;
1007         int n = 0, size, err;
1008
1009         if (copy_from_user(&req, arg, sizeof(req)))
1010                 return -EFAULT;
1011
1012         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1013                 return -EINVAL;
1014
1015         size = sizeof(req) + req.conn_num * sizeof(*ci);
1016
1017         cl = kmalloc(size, GFP_KERNEL);
1018         if (!cl)
1019                 return -ENOMEM;
1020
1021         hdev = hci_dev_get(req.dev_id);
1022         if (!hdev) {
1023                 kfree(cl);
1024                 return -ENODEV;
1025         }
1026
1027         ci = cl->conn_info;
1028
1029         hci_dev_lock(hdev);
1030         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1031                 bacpy(&(ci + n)->bdaddr, &c->dst);
1032                 (ci + n)->handle = c->handle;
1033                 (ci + n)->type  = c->type;
1034                 (ci + n)->out   = c->out;
1035                 (ci + n)->state = c->state;
1036                 (ci + n)->link_mode = c->link_mode;
1037                 if (++n >= req.conn_num)
1038                         break;
1039         }
1040         hci_dev_unlock(hdev);
1041
1042         cl->dev_id = hdev->id;
1043         cl->conn_num = n;
1044         size = sizeof(req) + n * sizeof(*ci);
1045
1046         hci_dev_put(hdev);
1047
1048         err = copy_to_user(arg, cl, size);
1049         kfree(cl);
1050
1051         return err ? -EFAULT : 0;
1052 }
1053
1054 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1055 {
1056         struct hci_conn_info_req req;
1057         struct hci_conn_info ci;
1058         struct hci_conn *conn;
1059         char __user *ptr = arg + sizeof(req);
1060
1061         if (copy_from_user(&req, arg, sizeof(req)))
1062                 return -EFAULT;
1063
1064         hci_dev_lock(hdev);
1065         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1066         if (conn) {
1067                 bacpy(&ci.bdaddr, &conn->dst);
1068                 ci.handle = conn->handle;
1069                 ci.type  = conn->type;
1070                 ci.out   = conn->out;
1071                 ci.state = conn->state;
1072                 ci.link_mode = conn->link_mode;
1073         }
1074         hci_dev_unlock(hdev);
1075
1076         if (!conn)
1077                 return -ENOENT;
1078
1079         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1080 }
1081
1082 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1083 {
1084         struct hci_auth_info_req req;
1085         struct hci_conn *conn;
1086
1087         if (copy_from_user(&req, arg, sizeof(req)))
1088                 return -EFAULT;
1089
1090         hci_dev_lock(hdev);
1091         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1092         if (conn)
1093                 req.type = conn->auth_type;
1094         hci_dev_unlock(hdev);
1095
1096         if (!conn)
1097                 return -ENOENT;
1098
1099         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1100 }
1101
1102 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1103 {
1104         struct hci_dev *hdev = conn->hdev;
1105         struct hci_chan *chan;
1106
1107         BT_DBG("%s hcon %p", hdev->name, conn);
1108
1109         chan = kzalloc(sizeof(struct hci_chan), GFP_KERNEL);
1110         if (!chan)
1111                 return NULL;
1112
1113         chan->conn = conn;
1114         skb_queue_head_init(&chan->data_q);
1115         chan->state = BT_CONNECTED;
1116
1117         list_add_rcu(&chan->list, &conn->chan_list);
1118
1119         return chan;
1120 }
1121
1122 void hci_chan_del(struct hci_chan *chan)
1123 {
1124         struct hci_conn *conn = chan->conn;
1125         struct hci_dev *hdev = conn->hdev;
1126
1127         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1128
1129         list_del_rcu(&chan->list);
1130
1131         synchronize_rcu();
1132
1133         hci_conn_drop(conn);
1134
1135         skb_queue_purge(&chan->data_q);
1136         kfree(chan);
1137 }
1138
1139 void hci_chan_list_flush(struct hci_conn *conn)
1140 {
1141         struct hci_chan *chan, *n;
1142
1143         BT_DBG("hcon %p", conn);
1144
1145         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1146                 hci_chan_del(chan);
1147 }
1148
1149 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1150                                                  __u16 handle)
1151 {
1152         struct hci_chan *hchan;
1153
1154         list_for_each_entry(hchan, &hcon->chan_list, list) {
1155                 if (hchan->handle == handle)
1156                         return hchan;
1157         }
1158
1159         return NULL;
1160 }
1161
1162 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1163 {
1164         struct hci_conn_hash *h = &hdev->conn_hash;
1165         struct hci_conn *hcon;
1166         struct hci_chan *hchan = NULL;
1167
1168         rcu_read_lock();
1169
1170         list_for_each_entry_rcu(hcon, &h->list, list) {
1171                 hchan = __hci_chan_lookup_handle(hcon, handle);
1172                 if (hchan)
1173                         break;
1174         }
1175
1176         rcu_read_unlock();
1177
1178         return hchan;
1179 }