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 #include <linux/debugfs.h>
  29
  30 #include <net/bluetooth/bluetooth.h>
  31 #include <net/bluetooth/hci_core.h>
  32 #include <net/bluetooth/l2cap.h>
  33
  34 #include "hci_request.h"
  35 #include "smp.h"
  36 #include "a2mp.h"
  37
  38 struct sco_param {
  39         u16 pkt_type;
  40         u16 max_latency;
  41         u8  retrans_effort;
  42 };
  43
  44 static const struct sco_param esco_param_cvsd[] = {
  45         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a,   0x01 }, /* S3 */
  46         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007,   0x01 }, /* S2 */
  47         { EDR_ESCO_MASK | ESCO_EV3,   0x0007,   0x01 }, /* S1 */
  48         { EDR_ESCO_MASK | ESCO_HV3,   0xffff,   0x01 }, /* D1 */
  49         { EDR_ESCO_MASK | ESCO_HV1,   0xffff,   0x01 }, /* D0 */
  50 };
  51
  52 static const struct sco_param sco_param_cvsd[] = {
  53         { EDR_ESCO_MASK | ESCO_HV3,   0xffff,   0xff }, /* D1 */
  54         { EDR_ESCO_MASK | ESCO_HV1,   0xffff,   0xff }, /* D0 */
  55 };
  56
  57 static const struct sco_param esco_param_msbc[] = {
  58         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d,   0x02 }, /* T2 */
  59         { EDR_ESCO_MASK | ESCO_EV3,   0x0008,   0x02 }, /* T1 */
  60 };
  61
  62 /* This function requires the caller holds hdev->lock */
  63 static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
  64 {
  65         struct hci_conn_params *params;
  66         struct hci_dev *hdev = conn->hdev;
  67         struct smp_irk *irk;
  68         bdaddr_t *bdaddr;
  69         u8 bdaddr_type;
  70
  71         bdaddr = &conn->dst;
  72         bdaddr_type = conn->dst_type;
  73
  74         /* Check if we need to convert to identity address */
  75         irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
  76         if (irk) {
  77                 bdaddr = &irk->bdaddr;
  78                 bdaddr_type = irk->addr_type;
  79         }
  80
  81         params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
  82                                            bdaddr_type);
  83         if (!params || !params->explicit_connect)
  84                 return;
  85
  86         /* The connection attempt was doing scan for new RPA, and is
  87          * in scan phase. If params are not associated with any other
  88          * autoconnect action, remove them completely. If they are, just unmark
  89          * them as waiting for connection, by clearing explicit_connect field.
  90          */
  91         params->explicit_connect = false;
  92
  93         list_del_init(&params->action);
  94
  95         switch (params->auto_connect) {
  96         case HCI_AUTO_CONN_EXPLICIT:
  97                 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
  98                 /* return instead of break to avoid duplicate scan update */
  99                 return;
 100         case HCI_AUTO_CONN_DIRECT:
 101         case HCI_AUTO_CONN_ALWAYS:
 102                 list_add(&params->action, &hdev->pend_le_conns);
 103                 break;
 104         case HCI_AUTO_CONN_REPORT:
 105                 list_add(&params->action, &hdev->pend_le_reports);
 106                 break;
 107         default:
 108                 break;
 109         }
 110
 111         hci_update_background_scan(hdev);
 112 }
 113
 114 static void hci_conn_cleanup(struct hci_conn *conn)
 115 {
 116         struct hci_dev *hdev = conn->hdev;
 117
 118         if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
 119                 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
 120
 121         hci_chan_list_flush(conn);
 122
 123         hci_conn_hash_del(hdev, conn);
 124
 125         if (hdev->notify)
 126                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 127
 128         hci_conn_del_sysfs(conn);
 129
 130         debugfs_remove_recursive(conn->debugfs);
 131
 132         hci_dev_put(hdev);
 133
 134         hci_conn_put(conn);
 135 }
 136
 137 static void le_scan_cleanup(struct work_struct *work)
 138 {
 139         struct hci_conn *conn = container_of(work, struct hci_conn,
 140                                              le_scan_cleanup);
 141         struct hci_dev *hdev = conn->hdev;
 142         struct hci_conn *c = NULL;
 143
 144         BT_DBG("%s hcon %p", hdev->name, conn);
 145
 146         hci_dev_lock(hdev);
 147
 148         /* Check that the hci_conn is still around */
 149         rcu_read_lock();
 150         list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
 151                 if (c == conn)
 152                         break;
 153         }
 154         rcu_read_unlock();
 155
 156         if (c == conn) {
 157                 hci_connect_le_scan_cleanup(conn);
 158                 hci_conn_cleanup(conn);
 159         }
 160
 161         hci_dev_unlock(hdev);
 162         hci_dev_put(hdev);
 163         hci_conn_put(conn);
 164 }
 165
 166 static void hci_connect_le_scan_remove(struct hci_conn *conn)
 167 {
 168         BT_DBG("%s hcon %p", conn->hdev->name, conn);
 169
 170         /* We can't call hci_conn_del/hci_conn_cleanup here since that
 171          * could deadlock with another hci_conn_del() call that's holding
 172          * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
 173          * Instead, grab temporary extra references to the hci_dev and
 174          * hci_conn and perform the necessary cleanup in a separate work
 175          * callback.
 176          */
 177
 178         hci_dev_hold(conn->hdev);
 179         hci_conn_get(conn);
 180
 181         /* Even though we hold a reference to the hdev, many other
 182          * things might get cleaned up meanwhile, including the hdev's
 183          * own workqueue, so we can't use that for scheduling.
 184          */
 185         schedule_work(&conn->le_scan_cleanup);
 186 }
 187
 188 static void hci_acl_create_connection(struct hci_conn *conn)
 189 {
 190         struct hci_dev *hdev = conn->hdev;
 191         struct inquiry_entry *ie;
 192         struct hci_cp_create_conn cp;
 193
 194         BT_DBG("hcon %p", conn);
 195
 196         conn->state = BT_CONNECT;
 197         conn->out = true;
 198         conn->role = HCI_ROLE_MASTER;
 199
 200         conn->attempt++;
 201
 202         conn->link_policy = hdev->link_policy;
 203
 204         memset(&cp, 0, sizeof(cp));
 205         bacpy(&cp.bdaddr, &conn->dst);
 206         cp.pscan_rep_mode = 0x02;
 207
 208         ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
 209         if (ie) {
 210                 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
 211                         cp.pscan_rep_mode = ie->data.pscan_rep_mode;
 212                         cp.pscan_mode     = ie->data.pscan_mode;
 213                         cp.clock_offset   = ie->data.clock_offset |
 214                                             cpu_to_le16(0x8000);
 215                 }
 216
 217                 memcpy(conn->dev_class, ie->data.dev_class, 3);
 218                 if (ie->data.ssp_mode > 0)
 219                         set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
 220         }
 221
 222         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 223         if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
 224                 cp.role_switch = 0x01;
 225         else
 226                 cp.role_switch = 0x00;
 227
 228         hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
 229 }
 230
 231 int hci_disconnect(struct hci_conn *conn, __u8 reason)
 232 {
 233         BT_DBG("hcon %p", conn);
 234
 235         /* When we are master of an established connection and it enters
 236          * the disconnect timeout, then go ahead and try to read the
 237          * current clock offset.  Processing of the result is done
 238          * within the event handling and hci_clock_offset_evt function.
 239          */
 240         if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
 241             (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
 242                 struct hci_dev *hdev = conn->hdev;
 243                 struct hci_cp_read_clock_offset clkoff_cp;
 244
 245                 clkoff_cp.handle = cpu_to_le16(conn->handle);
 246                 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
 247                              &clkoff_cp);
 248         }
 249
 250         return hci_abort_conn(conn, reason);
 251 }
 252
 253 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
 254 {
 255         struct hci_dev *hdev = conn->hdev;
 256         struct hci_cp_add_sco cp;
 257
 258         BT_DBG("hcon %p", conn);
 259
 260         conn->state = BT_CONNECT;
 261         conn->out = true;
 262
 263         conn->attempt++;
 264
 265         cp.handle   = cpu_to_le16(handle);
 266         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 267
 268         hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 269 }
 270
 271 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
 272 {
 273         struct hci_dev *hdev = conn->hdev;
 274         struct hci_cp_setup_sync_conn cp;
 275         const struct sco_param *param;
 276
 277         BT_DBG("hcon %p", conn);
 278
 279         conn->state = BT_CONNECT;
 280         conn->out = true;
 281
 282         conn->attempt++;
 283
 284         cp.handle   = cpu_to_le16(handle);
 285
 286         cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
 287         cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
 288         cp.voice_setting  = cpu_to_le16(conn->setting);
 289
 290         switch (conn->setting & SCO_AIRMODE_MASK) {
 291         case SCO_AIRMODE_TRANSP:
 292                 if (conn->attempt > ARRAY_SIZE(esco_param_msbc))
 293                         return false;
 294                 param = &esco_param_msbc[conn->attempt - 1];
 295                 break;
 296         case SCO_AIRMODE_CVSD:
 297                 if (lmp_esco_capable(conn->link)) {
 298                         if (conn->attempt > ARRAY_SIZE(esco_param_cvsd))
 299                                 return false;
 300                         param = &esco_param_cvsd[conn->attempt - 1];
 301                 } else {
 302                         if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
 303                                 return false;
 304                         param = &sco_param_cvsd[conn->attempt - 1];
 305                 }
 306                 break;
 307         default:
 308                 return false;
 309         }
 310
 311         cp.retrans_effort = param->retrans_effort;
 312         cp.pkt_type = __cpu_to_le16(param->pkt_type);
 313         cp.max_latency = __cpu_to_le16(param->max_latency);
 314
 315         if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
 316                 return false;
 317
 318         return true;
 319 }
 320
 321 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
 322                       u16 to_multiplier)
 323 {
 324         struct hci_dev *hdev = conn->hdev;
 325         struct hci_conn_params *params;
 326         struct hci_cp_le_conn_update cp;
 327
 328         hci_dev_lock(hdev);
 329
 330         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 331         if (params) {
 332                 params->conn_min_interval = min;
 333                 params->conn_max_interval = max;
 334                 params->conn_latency = latency;
 335                 params->supervision_timeout = to_multiplier;
 336         }
 337
 338         hci_dev_unlock(hdev);
 339
 340         memset(&cp, 0, sizeof(cp));
 341         cp.handle               = cpu_to_le16(conn->handle);
 342         cp.conn_interval_min    = cpu_to_le16(min);
 343         cp.conn_interval_max    = cpu_to_le16(max);
 344         cp.conn_latency         = cpu_to_le16(latency);
 345         cp.supervision_timeout  = cpu_to_le16(to_multiplier);
 346         cp.min_ce_len           = cpu_to_le16(0x0000);
 347         cp.max_ce_len           = cpu_to_le16(0x0000);
 348
 349         hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
 350
 351         if (params)
 352                 return 0x01;
 353
 354         return 0x00;
 355 }
 356
 357 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
 358                       __u8 ltk[16], __u8 key_size)
 359 {
 360         struct hci_dev *hdev = conn->hdev;
 361         struct hci_cp_le_start_enc cp;
 362
 363         BT_DBG("hcon %p", conn);
 364
 365         memset(&cp, 0, sizeof(cp));
 366
 367         cp.handle = cpu_to_le16(conn->handle);
 368         cp.rand = rand;
 369         cp.ediv = ediv;
 370         memcpy(cp.ltk, ltk, key_size);
 371
 372         hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
 373 }
 374
 375 /* Device _must_ be locked */
 376 void hci_sco_setup(struct hci_conn *conn, __u8 status)
 377 {
 378         struct hci_conn *sco = conn->link;
 379
 380         if (!sco)
 381                 return;
 382
 383         BT_DBG("hcon %p", conn);
 384
 385         if (!status) {
 386                 if (lmp_esco_capable(conn->hdev))
 387                         hci_setup_sync(sco, conn->handle);
 388                 else
 389                         hci_add_sco(sco, conn->handle);
 390         } else {
 391                 hci_connect_cfm(sco, status);
 392                 hci_conn_del(sco);
 393         }
 394 }
 395
 396 static void hci_conn_timeout(struct work_struct *work)
 397 {
 398         struct hci_conn *conn = container_of(work, struct hci_conn,
 399                                              disc_work.work);
 400         int refcnt = atomic_read(&conn->refcnt);
 401
 402         BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
 403
 404         WARN_ON(refcnt < 0);
 405
 406         /* FIXME: It was observed that in pairing failed scenario, refcnt
 407          * drops below 0. Probably this is because l2cap_conn_del calls
 408          * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
 409          * dropped. After that loop hci_chan_del is called which also drops
 410          * conn. For now make sure that ACL is alive if refcnt is higher then 0,
 411          * otherwise drop it.
 412          */
 413         if (refcnt > 0)
 414                 return;
 415
 416         /* LE connections in scanning state need special handling */
 417         if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
 418             test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 419                 hci_connect_le_scan_remove(conn);
 420                 return;
 421         }
 422
 423         hci_abort_conn(conn, hci_proto_disconn_ind(conn));
 424 }
 425
 426 /* Enter sniff mode */
 427 static void hci_conn_idle(struct work_struct *work)
 428 {
 429         struct hci_conn *conn = container_of(work, struct hci_conn,
 430                                              idle_work.work);
 431         struct hci_dev *hdev = conn->hdev;
 432
 433         BT_DBG("hcon %p mode %d", conn, conn->mode);
 434
 435         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 436                 return;
 437
 438         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 439                 return;
 440
 441         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 442                 struct hci_cp_sniff_subrate cp;
 443                 cp.handle             = cpu_to_le16(conn->handle);
 444                 cp.max_latency        = cpu_to_le16(0);
 445                 cp.min_remote_timeout = cpu_to_le16(0);
 446                 cp.min_local_timeout  = cpu_to_le16(0);
 447                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 448         }
 449
 450         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 451                 struct hci_cp_sniff_mode cp;
 452                 cp.handle       = cpu_to_le16(conn->handle);
 453                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 454                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 455                 cp.attempt      = cpu_to_le16(4);
 456                 cp.timeout      = cpu_to_le16(1);
 457                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 458         }
 459 }
 460
 461 static void hci_conn_auto_accept(struct work_struct *work)
 462 {
 463         struct hci_conn *conn = container_of(work, struct hci_conn,
 464                                              auto_accept_work.work);
 465
 466         hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
 467                      &conn->dst);
 468 }
 469
 470 static void le_conn_timeout(struct work_struct *work)
 471 {
 472         struct hci_conn *conn = container_of(work, struct hci_conn,
 473                                              le_conn_timeout.work);
 474         struct hci_dev *hdev = conn->hdev;
 475
 476         BT_DBG("");
 477
 478         /* We could end up here due to having done directed advertising,
 479          * so clean up the state if necessary. This should however only
 480          * happen with broken hardware or if low duty cycle was used
 481          * (which doesn't have a timeout of its own).
 482          */
 483         if (conn->role == HCI_ROLE_SLAVE) {
 484                 u8 enable = 0x00;
 485                 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 486                              &enable);
 487                 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
 488                 return;
 489         }
 490
 491         hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
 492 }
 493
 494 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
 495                               u8 role)
 496 {
 497         struct hci_conn *conn;
 498
 499         BT_DBG("%s dst %pMR", hdev->name, dst);
 500
 501         conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 502         if (!conn)
 503                 return NULL;
 504
 505         bacpy(&conn->dst, dst);
 506         bacpy(&conn->src, &hdev->bdaddr);
 507         conn->hdev  = hdev;
 508         conn->type  = type;
 509         conn->role  = role;
 510         conn->mode  = HCI_CM_ACTIVE;
 511         conn->state = BT_OPEN;
 512         conn->auth_type = HCI_AT_GENERAL_BONDING;
 513         conn->io_capability = hdev->io_capability;
 514         conn->remote_auth = 0xff;
 515         conn->key_type = 0xff;
 516         conn->rssi = HCI_RSSI_INVALID;
 517         conn->tx_power = HCI_TX_POWER_INVALID;
 518         conn->max_tx_power = HCI_TX_POWER_INVALID;
 519
 520         set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
 521         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 522
 523         /* Set Default Authenticated payload timeout to 30s */
 524         conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
 525
 526         if (conn->role == HCI_ROLE_MASTER)
 527                 conn->out = true;
 528
 529         switch (type) {
 530         case ACL_LINK:
 531                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 532                 break;
 533         case LE_LINK:
 534                 /* conn->src should reflect the local identity address */
 535                 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
 536                 break;
 537         case SCO_LINK:
 538                 if (lmp_esco_capable(hdev))
 539                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 540                                         (hdev->esco_type & EDR_ESCO_MASK);
 541                 else
 542                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 543                 break;
 544         case ESCO_LINK:
 545                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 546                 break;
 547         }
 548
 549         skb_queue_head_init(&conn->data_q);
 550
 551         INIT_LIST_HEAD(&conn->chan_list);
 552
 553         INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
 554         INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
 555         INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
 556         INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
 557         INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
 558
 559         atomic_set(&conn->refcnt, 0);
 560
 561         hci_dev_hold(hdev);
 562
 563         hci_conn_hash_add(hdev, conn);
 564         if (hdev->notify)
 565                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 566
 567         hci_conn_init_sysfs(conn);
 568
 569         return conn;
 570 }
 571
 572 int hci_conn_del(struct hci_conn *conn)
 573 {
 574         struct hci_dev *hdev = conn->hdev;
 575
 576         BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
 577
 578         cancel_delayed_work_sync(&conn->disc_work);
 579         cancel_delayed_work_sync(&conn->auto_accept_work);
 580         cancel_delayed_work_sync(&conn->idle_work);
 581
 582         if (conn->type == ACL_LINK) {
 583                 struct hci_conn *sco = conn->link;
 584                 if (sco)
 585                         sco->link = NULL;
 586
 587                 /* Unacked frames */
 588                 hdev->acl_cnt += conn->sent;
 589         } else if (conn->type == LE_LINK) {
 590                 cancel_delayed_work(&conn->le_conn_timeout);
 591
 592                 if (hdev->le_pkts)
 593                         hdev->le_cnt += conn->sent;
 594                 else
 595                         hdev->acl_cnt += conn->sent;
 596         } else {
 597                 struct hci_conn *acl = conn->link;
 598                 if (acl) {
 599                         acl->link = NULL;
 600                         hci_conn_drop(acl);
 601                 }
 602         }
 603
 604         if (conn->amp_mgr)
 605                 amp_mgr_put(conn->amp_mgr);
 606
 607         skb_queue_purge(&conn->data_q);
 608
 609         /* Remove the connection from the list and cleanup its remaining
 610          * state. This is a separate function since for some cases like
 611          * BT_CONNECT_SCAN we *only* want the cleanup part without the
 612          * rest of hci_conn_del.
 613          */
 614         hci_conn_cleanup(conn);
 615
 616         return 0;
 617 }
 618
 619 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
 620 {
 621         int use_src = bacmp(src, BDADDR_ANY);
 622         struct hci_dev *hdev = NULL, *d;
 623
 624         BT_DBG("%pMR -> %pMR", src, dst);
 625
 626         read_lock(&hci_dev_list_lock);
 627
 628         list_for_each_entry(d, &hci_dev_list, list) {
 629                 if (!test_bit(HCI_UP, &d->flags) ||
 630                     hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
 631                     d->dev_type != HCI_PRIMARY)
 632                         continue;
 633
 634                 /* Simple routing:
 635                  *   No source address - find interface with bdaddr != dst
 636                  *   Source address    - find interface with bdaddr == src
 637                  */
 638
 639                 if (use_src) {
 640                         bdaddr_t id_addr;
 641                         u8 id_addr_type;
 642
 643                         if (src_type == BDADDR_BREDR) {
 644                                 if (!lmp_bredr_capable(d))
 645                                         continue;
 646                                 bacpy(&id_addr, &d->bdaddr);
 647                                 id_addr_type = BDADDR_BREDR;
 648                         } else {
 649                                 if (!lmp_le_capable(d))
 650                                         continue;
 651
 652                                 hci_copy_identity_address(d, &id_addr,
 653                                                           &id_addr_type);
 654
 655                                 /* Convert from HCI to three-value type */
 656                                 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
 657                                         id_addr_type = BDADDR_LE_PUBLIC;
 658                                 else
 659                                         id_addr_type = BDADDR_LE_RANDOM;
 660                         }
 661
 662                         if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
 663                                 hdev = d; break;
 664                         }
 665                 } else {
 666                         if (bacmp(&d->bdaddr, dst)) {
 667                                 hdev = d; break;
 668                         }
 669                 }
 670         }
 671
 672         if (hdev)
 673                 hdev = hci_dev_hold(hdev);
 674
 675         read_unlock(&hci_dev_list_lock);
 676         return hdev;
 677 }
 678 EXPORT_SYMBOL(hci_get_route);
 679
 680 /* This function requires the caller holds hdev->lock */
 681 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 682 {
 683         struct hci_dev *hdev = conn->hdev;
 684         struct hci_conn_params *params;
 685
 686         params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
 687                                            conn->dst_type);
 688         if (params && params->conn) {
 689                 hci_conn_drop(params->conn);
 690                 hci_conn_put(params->conn);
 691                 params->conn = NULL;
 692         }
 693
 694         conn->state = BT_CLOSED;
 695
 696         /* If the status indicates successful cancellation of
 697          * the attempt (i.e. Unkown Connection Id) there's no point of
 698          * notifying failure since we'll go back to keep trying to
 699          * connect. The only exception is explicit connect requests
 700          * where a timeout + cancel does indicate an actual failure.
 701          */
 702         if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
 703             (params && params->explicit_connect))
 704                 mgmt_connect_failed(hdev, &conn->dst, conn->type,
 705                                     conn->dst_type, status);
 706
 707         hci_connect_cfm(conn, status);
 708
 709         hci_conn_del(conn);
 710
 711         /* Since we may have temporarily stopped the background scanning in
 712          * favor of connection establishment, we should restart it.
 713          */
 714         hci_update_background_scan(hdev);
 715
 716         /* Re-enable advertising in case this was a failed connection
 717          * attempt as a peripheral.
 718          */
 719         hci_req_reenable_advertising(hdev);
 720 }
 721
 722 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 723 {
 724         struct hci_conn *conn;
 725
 726         hci_dev_lock(hdev);
 727
 728         conn = hci_lookup_le_connect(hdev);
 729
 730         if (!status) {
 731                 hci_connect_le_scan_cleanup(conn);
 732                 goto done;
 733         }
 734
 735         bt_dev_err(hdev, "request failed to create LE connection: "
 736                    "status 0x%2.2x", status);
 737
 738         if (!conn)
 739                 goto done;
 740
 741         hci_le_conn_failed(conn, status);
 742
 743 done:
 744         hci_dev_unlock(hdev);
 745 }
 746
 747 static bool conn_use_rpa(struct hci_conn *conn)
 748 {
 749         struct hci_dev *hdev = conn->hdev;
 750
 751         return hci_dev_test_flag(hdev, HCI_PRIVACY);
 752 }
 753
 754 static void set_ext_conn_params(struct hci_conn *conn,
 755                                 struct hci_cp_le_ext_conn_param *p)
 756 {
 757         struct hci_dev *hdev = conn->hdev;
 758
 759         memset(p, 0, sizeof(*p));
 760
 761         /* Set window to be the same value as the interval to
 762          * enable continuous scanning.
 763          */
 764         p->scan_interval = cpu_to_le16(hdev->le_scan_interval);
 765         p->scan_window = p->scan_interval;
 766         p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 767         p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 768         p->conn_latency = cpu_to_le16(conn->le_conn_latency);
 769         p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 770         p->min_ce_len = cpu_to_le16(0x0000);
 771         p->max_ce_len = cpu_to_le16(0x0000);
 772 }
 773
 774 static void hci_req_add_le_create_conn(struct hci_request *req,
 775                                        struct hci_conn *conn,
 776                                        bdaddr_t *direct_rpa)
 777 {
 778         struct hci_dev *hdev = conn->hdev;
 779         u8 own_addr_type;
 780
 781         /* If direct address was provided we use it instead of current
 782          * address.
 783          */
 784         if (direct_rpa) {
 785                 if (bacmp(&req->hdev->random_addr, direct_rpa))
 786                         hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
 787                                                                 direct_rpa);
 788
 789                 /* direct address is always RPA */
 790                 own_addr_type = ADDR_LE_DEV_RANDOM;
 791         } else {
 792                 /* Update random address, but set require_privacy to false so
 793                  * that we never connect with an non-resolvable address.
 794                  */
 795                 if (hci_update_random_address(req, false, conn_use_rpa(conn),
 796                                               &own_addr_type))
 797                         return;
 798         }
 799
 800         if (use_ext_conn(hdev)) {
 801                 struct hci_cp_le_ext_create_conn *cp;
 802                 struct hci_cp_le_ext_conn_param *p;
 803                 u8 data[sizeof(*cp) + sizeof(*p) * 3];
 804                 u32 plen;
 805
 806                 cp = (void *) data;
 807                 p = (void *) cp->data;
 808
 809                 memset(cp, 0, sizeof(*cp));
 810
 811                 bacpy(&cp->peer_addr, &conn->dst);
 812                 cp->peer_addr_type = conn->dst_type;
 813                 cp->own_addr_type = own_addr_type;
 814
 815                 plen = sizeof(*cp);
 816
 817                 if (scan_1m(hdev)) {
 818                         cp->phys |= LE_SCAN_PHY_1M;
 819                         set_ext_conn_params(conn, p);
 820
 821                         p++;
 822                         plen += sizeof(*p);
 823                 }
 824
 825                 if (scan_2m(hdev)) {
 826                         cp->phys |= LE_SCAN_PHY_2M;
 827                         set_ext_conn_params(conn, p);
 828
 829                         p++;
 830                         plen += sizeof(*p);
 831                 }
 832
 833                 if (scan_coded(hdev)) {
 834                         cp->phys |= LE_SCAN_PHY_CODED;
 835                         set_ext_conn_params(conn, p);
 836
 837                         plen += sizeof(*p);
 838                 }
 839
 840                 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
 841
 842         } else {
 843                 struct hci_cp_le_create_conn cp;
 844
 845                 memset(&cp, 0, sizeof(cp));
 846
 847                 /* Set window to be the same value as the interval to enable
 848                  * continuous scanning.
 849                  */
 850                 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
 851                 cp.scan_window = cp.scan_interval;
 852
 853                 bacpy(&cp.peer_addr, &conn->dst);
 854                 cp.peer_addr_type = conn->dst_type;
 855                 cp.own_address_type = own_addr_type;
 856                 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 857                 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 858                 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
 859                 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 860                 cp.min_ce_len = cpu_to_le16(0x0000);
 861                 cp.max_ce_len = cpu_to_le16(0x0000);
 862
 863                 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 864         }
 865
 866         conn->state = BT_CONNECT;
 867         clear_bit(HCI_CONN_SCANNING, &conn->flags);
 868 }
 869
 870 static void hci_req_directed_advertising(struct hci_request *req,
 871                                          struct hci_conn *conn)
 872 {
 873         struct hci_dev *hdev = req->hdev;
 874         u8 own_addr_type;
 875         u8 enable;
 876
 877         if (ext_adv_capable(hdev)) {
 878                 struct hci_cp_le_set_ext_adv_params cp;
 879                 bdaddr_t random_addr;
 880
 881                 /* Set require_privacy to false so that the remote device has a
 882                  * chance of identifying us.
 883                  */
 884                 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
 885                                            &own_addr_type, &random_addr) < 0)
 886                         return;
 887
 888                 memset(&cp, 0, sizeof(cp));
 889
 890                 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
 891                 cp.own_addr_type = own_addr_type;
 892                 cp.channel_map = hdev->le_adv_channel_map;
 893                 cp.tx_power = HCI_TX_POWER_INVALID;
 894                 cp.primary_phy = HCI_ADV_PHY_1M;
 895                 cp.secondary_phy = HCI_ADV_PHY_1M;
 896                 cp.handle = 0; /* Use instance 0 for directed adv */
 897                 cp.own_addr_type = own_addr_type;
 898                 cp.peer_addr_type = conn->dst_type;
 899                 bacpy(&cp.peer_addr, &conn->dst);
 900
 901                 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
 902
 903                 if (own_addr_type == ADDR_LE_DEV_RANDOM &&
 904                     bacmp(&random_addr, BDADDR_ANY) &&
 905                     bacmp(&random_addr, &hdev->random_addr)) {
 906                         struct hci_cp_le_set_adv_set_rand_addr cp;
 907
 908                         memset(&cp, 0, sizeof(cp));
 909
 910                         cp.handle = 0;
 911                         bacpy(&cp.bdaddr, &random_addr);
 912
 913                         hci_req_add(req,
 914                                     HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
 915                                     sizeof(cp), &cp);
 916                 }
 917
 918                 __hci_req_enable_ext_advertising(req, 0x00);
 919         } else {
 920                 struct hci_cp_le_set_adv_param cp;
 921
 922                 /* Clear the HCI_LE_ADV bit temporarily so that the
 923                  * hci_update_random_address knows that it's safe to go ahead
 924                  * and write a new random address. The flag will be set back on
 925                  * as soon as the SET_ADV_ENABLE HCI command completes.
 926                  */
 927                 hci_dev_clear_flag(hdev, HCI_LE_ADV);
 928
 929                 /* Set require_privacy to false so that the remote device has a
 930                  * chance of identifying us.
 931                  */
 932                 if (hci_update_random_address(req, false, conn_use_rpa(conn),
 933                                               &own_addr_type) < 0)
 934                         return;
 935
 936                 memset(&cp, 0, sizeof(cp));
 937
 938                 /* Some controllers might reject command if intervals are not
 939                  * within range for undirected advertising.
 940                  * BCM20702A0 is known to be affected by this.
 941                  */
 942                 cp.min_interval = cpu_to_le16(0x0020);
 943                 cp.max_interval = cpu_to_le16(0x0020);
 944
 945                 cp.type = LE_ADV_DIRECT_IND;
 946                 cp.own_address_type = own_addr_type;
 947                 cp.direct_addr_type = conn->dst_type;
 948                 bacpy(&cp.direct_addr, &conn->dst);
 949                 cp.channel_map = hdev->le_adv_channel_map;
 950
 951                 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
 952
 953                 enable = 0x01;
 954                 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 955                             &enable);
 956         }
 957
 958         conn->state = BT_CONNECT;
 959 }
 960
 961 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 962                                 u8 dst_type, u8 sec_level, u16 conn_timeout,
 963                                 u8 role, bdaddr_t *direct_rpa)
 964 {
 965         struct hci_conn_params *params;
 966         struct hci_conn *conn;
 967         struct smp_irk *irk;
 968         struct hci_request req;
 969         int err;
 970
 971         /* Let's make sure that le is enabled.*/
 972         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
 973                 if (lmp_le_capable(hdev))
 974                         return ERR_PTR(-ECONNREFUSED);
 975
 976                 return ERR_PTR(-EOPNOTSUPP);
 977         }
 978
 979         /* Since the controller supports only one LE connection attempt at a
 980          * time, we return -EBUSY if there is any connection attempt running.
 981          */
 982         if (hci_lookup_le_connect(hdev))
 983                 return ERR_PTR(-EBUSY);
 984
 985         /* If there's already a connection object but it's not in
 986          * scanning state it means it must already be established, in
 987          * which case we can't do anything else except report a failure
 988          * to connect.
 989          */
 990         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
 991         if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 992                 return ERR_PTR(-EBUSY);
 993         }
 994
 995         /* When given an identity address with existing identity
 996          * resolving key, the connection needs to be established
 997          * to a resolvable random address.
 998          *
 999          * Storing the resolvable random address is required here
1000          * to handle connection failures. The address will later
1001          * be resolved back into the original identity address
1002          * from the connect request.
1003          */
1004         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1005         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1006                 dst = &irk->rpa;
1007                 dst_type = ADDR_LE_DEV_RANDOM;
1008         }
1009
1010         if (conn) {
1011                 bacpy(&conn->dst, dst);
1012         } else {
1013                 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1014                 if (!conn)
1015                         return ERR_PTR(-ENOMEM);
1016                 hci_conn_hold(conn);
1017                 conn->pending_sec_level = sec_level;
1018         }
1019
1020         conn->dst_type = dst_type;
1021         conn->sec_level = BT_SECURITY_LOW;
1022         conn->conn_timeout = conn_timeout;
1023
1024         hci_req_init(&req, hdev);
1025
1026         /* Disable advertising if we're active. For master role
1027          * connections most controllers will refuse to connect if
1028          * advertising is enabled, and for slave role connections we
1029          * anyway have to disable it in order to start directed
1030          * advertising.
1031          */
1032         if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
1033                 u8 enable = 0x00;
1034                 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1035                             &enable);
1036         }
1037
1038         /* If requested to connect as slave use directed advertising */
1039         if (conn->role == HCI_ROLE_SLAVE) {
1040                 /* If we're active scanning most controllers are unable
1041                  * to initiate advertising. Simply reject the attempt.
1042                  */
1043                 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1044                     hdev->le_scan_type == LE_SCAN_ACTIVE) {
1045                         hci_req_purge(&req);
1046                         hci_conn_del(conn);
1047                         return ERR_PTR(-EBUSY);
1048                 }
1049
1050                 hci_req_directed_advertising(&req, conn);
1051                 goto create_conn;
1052         }
1053
1054         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1055         if (params) {
1056                 conn->le_conn_min_interval = params->conn_min_interval;
1057                 conn->le_conn_max_interval = params->conn_max_interval;
1058                 conn->le_conn_latency = params->conn_latency;
1059                 conn->le_supv_timeout = params->supervision_timeout;
1060         } else {
1061                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1062                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1063                 conn->le_conn_latency = hdev->le_conn_latency;
1064                 conn->le_supv_timeout = hdev->le_supv_timeout;
1065         }
1066
1067         /* If controller is scanning, we stop it since some controllers are
1068          * not able to scan and connect at the same time. Also set the
1069          * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1070          * handler for scan disabling knows to set the correct discovery
1071          * state.
1072          */
1073         if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1074                 hci_req_add_le_scan_disable(&req);
1075                 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1076         }
1077
1078         hci_req_add_le_create_conn(&req, conn, direct_rpa);
1079
1080 create_conn:
1081         err = hci_req_run(&req, create_le_conn_complete);
1082         if (err) {
1083                 hci_conn_del(conn);
1084                 return ERR_PTR(err);
1085         }
1086
1087         return conn;
1088 }
1089
1090 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1091 {
1092         struct hci_conn *conn;
1093
1094         conn = hci_conn_hash_lookup_le(hdev, addr, type);
1095         if (!conn)
1096                 return false;
1097
1098         if (conn->state != BT_CONNECTED)
1099                 return false;
1100
1101         return true;
1102 }
1103
1104 /* This function requires the caller holds hdev->lock */
1105 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1106                                         bdaddr_t *addr, u8 addr_type)
1107 {
1108         struct hci_conn_params *params;
1109
1110         if (is_connected(hdev, addr, addr_type))
1111                 return -EISCONN;
1112
1113         params = hci_conn_params_lookup(hdev, addr, addr_type);
1114         if (!params) {
1115                 params = hci_conn_params_add(hdev, addr, addr_type);
1116                 if (!params)
1117                         return -ENOMEM;
1118
1119                 /* If we created new params, mark them to be deleted in
1120                  * hci_connect_le_scan_cleanup. It's different case than
1121                  * existing disabled params, those will stay after cleanup.
1122                  */
1123                 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1124         }
1125
1126         /* We're trying to connect, so make sure params are at pend_le_conns */
1127         if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1128             params->auto_connect == HCI_AUTO_CONN_REPORT ||
1129             params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1130                 list_del_init(&params->action);
1131                 list_add(&params->action, &hdev->pend_le_conns);
1132         }
1133
1134         params->explicit_connect = true;
1135
1136         BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1137                params->auto_connect);
1138
1139         return 0;
1140 }
1141
1142 /* This function requires the caller holds hdev->lock */
1143 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1144                                      u8 dst_type, u8 sec_level,
1145                                      u16 conn_timeout)
1146 {
1147         struct hci_conn *conn;
1148
1149         /* Let's make sure that le is enabled.*/
1150         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1151                 if (lmp_le_capable(hdev))
1152                         return ERR_PTR(-ECONNREFUSED);
1153
1154                 return ERR_PTR(-EOPNOTSUPP);
1155         }
1156
1157         /* Some devices send ATT messages as soon as the physical link is
1158          * established. To be able to handle these ATT messages, the user-
1159          * space first establishes the connection and then starts the pairing
1160          * process.
1161          *
1162          * So if a hci_conn object already exists for the following connection
1163          * attempt, we simply update pending_sec_level and auth_type fields
1164          * and return the object found.
1165          */
1166         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1167         if (conn) {
1168                 if (conn->pending_sec_level < sec_level)
1169                         conn->pending_sec_level = sec_level;
1170                 goto done;
1171         }
1172
1173         BT_DBG("requesting refresh of dst_addr");
1174
1175         conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1176         if (!conn)
1177                 return ERR_PTR(-ENOMEM);
1178
1179         if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0)
1180                 return ERR_PTR(-EBUSY);
1181
1182         conn->state = BT_CONNECT;
1183         set_bit(HCI_CONN_SCANNING, &conn->flags);
1184         conn->dst_type = dst_type;
1185         conn->sec_level = BT_SECURITY_LOW;
1186         conn->pending_sec_level = sec_level;
1187         conn->conn_timeout = conn_timeout;
1188
1189         hci_update_background_scan(hdev);
1190
1191 done:
1192         hci_conn_hold(conn);
1193         return conn;
1194 }
1195
1196 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1197                                  u8 sec_level, u8 auth_type)
1198 {
1199         struct hci_conn *acl;
1200
1201         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1202                 if (lmp_bredr_capable(hdev))
1203                         return ERR_PTR(-ECONNREFUSED);
1204
1205                 return ERR_PTR(-EOPNOTSUPP);
1206         }
1207
1208         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1209         if (!acl) {
1210                 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1211                 if (!acl)
1212                         return ERR_PTR(-ENOMEM);
1213         }
1214
1215         hci_conn_hold(acl);
1216
1217         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1218                 acl->sec_level = BT_SECURITY_LOW;
1219                 acl->pending_sec_level = sec_level;
1220                 acl->auth_type = auth_type;
1221                 hci_acl_create_connection(acl);
1222         }
1223
1224         return acl;
1225 }
1226
1227 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1228                                  __u16 setting)
1229 {
1230         struct hci_conn *acl;
1231         struct hci_conn *sco;
1232
1233         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1234         if (IS_ERR(acl))
1235                 return acl;
1236
1237         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1238         if (!sco) {
1239                 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1240                 if (!sco) {
1241                         hci_conn_drop(acl);
1242                         return ERR_PTR(-ENOMEM);
1243                 }
1244         }
1245
1246         acl->link = sco;
1247         sco->link = acl;
1248
1249         hci_conn_hold(sco);
1250
1251         sco->setting = setting;
1252
1253         if (acl->state == BT_CONNECTED &&
1254             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1255                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1256                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1257
1258                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1259                         /* defer SCO setup until mode change completed */
1260                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1261                         return sco;
1262                 }
1263
1264                 hci_sco_setup(acl, 0x00);
1265         }
1266
1267         return sco;
1268 }
1269
1270 /* Check link security requirement */
1271 int hci_conn_check_link_mode(struct hci_conn *conn)
1272 {
1273         BT_DBG("hcon %p", conn);
1274
1275         /* In Secure Connections Only mode, it is required that Secure
1276          * Connections is used and the link is encrypted with AES-CCM
1277          * using a P-256 authenticated combination key.
1278          */
1279         if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1280                 if (!hci_conn_sc_enabled(conn) ||
1281                     !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1282                     conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1283                         return 0;
1284         }
1285
1286         if (hci_conn_ssp_enabled(conn) &&
1287             !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1288                 return 0;
1289
1290         return 1;
1291 }
1292
1293 /* Authenticate remote device */
1294 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1295 {
1296         BT_DBG("hcon %p", conn);
1297
1298         if (conn->pending_sec_level > sec_level)
1299                 sec_level = conn->pending_sec_level;
1300
1301         if (sec_level > conn->sec_level)
1302                 conn->pending_sec_level = sec_level;
1303         else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1304                 return 1;
1305
1306         /* Make sure we preserve an existing MITM requirement*/
1307         auth_type |= (conn->auth_type & 0x01);
1308
1309         conn->auth_type = auth_type;
1310
1311         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1312                 struct hci_cp_auth_requested cp;
1313
1314                 cp.handle = cpu_to_le16(conn->handle);
1315                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1316                              sizeof(cp), &cp);
1317
1318                 /* If we're already encrypted set the REAUTH_PEND flag,
1319                  * otherwise set the ENCRYPT_PEND.
1320                  */
1321                 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1322                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1323                 else
1324                         set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1325         }
1326
1327         return 0;
1328 }
1329
1330 /* Encrypt the the link */
1331 static void hci_conn_encrypt(struct hci_conn *conn)
1332 {
1333         BT_DBG("hcon %p", conn);
1334
1335         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1336                 struct hci_cp_set_conn_encrypt cp;
1337                 cp.handle  = cpu_to_le16(conn->handle);
1338                 cp.encrypt = 0x01;
1339                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1340                              &cp);
1341         }
1342 }
1343
1344 /* Enable security */
1345 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1346                       bool initiator)
1347 {
1348         BT_DBG("hcon %p", conn);
1349
1350         if (conn->type == LE_LINK)
1351                 return smp_conn_security(conn, sec_level);
1352
1353         /* For sdp we don't need the link key. */
1354         if (sec_level == BT_SECURITY_SDP)
1355                 return 1;
1356
1357         /* For non 2.1 devices and low security level we don't need the link
1358            key. */
1359         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1360                 return 1;
1361
1362         /* For other security levels we need the link key. */
1363         if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1364                 goto auth;
1365
1366         /* An authenticated FIPS approved combination key has sufficient
1367          * security for security level 4. */
1368         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1369             sec_level == BT_SECURITY_FIPS)
1370                 goto encrypt;
1371
1372         /* An authenticated combination key has sufficient security for
1373            security level 3. */
1374         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1375              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1376             sec_level == BT_SECURITY_HIGH)
1377                 goto encrypt;
1378
1379         /* An unauthenticated combination key has sufficient security for
1380            security level 1 and 2. */
1381         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1382              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1383             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1384                 goto encrypt;
1385
1386         /* A combination key has always sufficient security for the security
1387            levels 1 or 2. High security level requires the combination key
1388            is generated using maximum PIN code length (16).
1389            For pre 2.1 units. */
1390         if (conn->key_type == HCI_LK_COMBINATION &&
1391             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1392              conn->pin_length == 16))
1393                 goto encrypt;
1394
1395 auth:
1396         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1397                 return 0;
1398
1399         if (initiator)
1400                 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1401
1402         if (!hci_conn_auth(conn, sec_level, auth_type))
1403                 return 0;
1404
1405 encrypt:
1406         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1407                 /* Ensure that the encryption key size has been read,
1408                  * otherwise stall the upper layer responses.
1409                  */
1410                 if (!conn->enc_key_size)
1411                         return 0;
1412
1413                 /* Nothing else needed, all requirements are met */
1414                 return 1;
1415         }
1416
1417         hci_conn_encrypt(conn);
1418         return 0;
1419 }
1420 EXPORT_SYMBOL(hci_conn_security);
1421
1422 /* Check secure link requirement */
1423 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1424 {
1425         BT_DBG("hcon %p", conn);
1426
1427         /* Accept if non-secure or higher security level is required */
1428         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1429                 return 1;
1430
1431         /* Accept if secure or higher security level is already present */
1432         if (conn->sec_level == BT_SECURITY_HIGH ||
1433             conn->sec_level == BT_SECURITY_FIPS)
1434                 return 1;
1435
1436         /* Reject not secure link */
1437         return 0;
1438 }
1439 EXPORT_SYMBOL(hci_conn_check_secure);
1440
1441 /* Switch role */
1442 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1443 {
1444         BT_DBG("hcon %p", conn);
1445
1446         if (role == conn->role)
1447                 return 1;
1448
1449         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1450                 struct hci_cp_switch_role cp;
1451                 bacpy(&cp.bdaddr, &conn->dst);
1452                 cp.role = role;
1453                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1454         }
1455
1456         return 0;
1457 }
1458 EXPORT_SYMBOL(hci_conn_switch_role);
1459
1460 /* Enter active mode */
1461 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1462 {
1463         struct hci_dev *hdev = conn->hdev;
1464
1465         BT_DBG("hcon %p mode %d", conn, conn->mode);
1466
1467         if (conn->mode != HCI_CM_SNIFF)
1468                 goto timer;
1469
1470         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1471                 goto timer;
1472
1473         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1474                 struct hci_cp_exit_sniff_mode cp;
1475                 cp.handle = cpu_to_le16(conn->handle);
1476                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1477         }
1478
1479 timer:
1480         if (hdev->idle_timeout > 0)
1481                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1482                                    msecs_to_jiffies(hdev->idle_timeout));
1483 }
1484
1485 /* Drop all connection on the device */
1486 void hci_conn_hash_flush(struct hci_dev *hdev)
1487 {
1488         struct hci_conn_hash *h = &hdev->conn_hash;
1489         struct hci_conn *c, *n;
1490
1491         BT_DBG("hdev %s", hdev->name);
1492
1493         list_for_each_entry_safe(c, n, &h->list, list) {
1494                 c->state = BT_CLOSED;
1495
1496                 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1497                 hci_conn_del(c);
1498         }
1499 }
1500
1501 /* Check pending connect attempts */
1502 void hci_conn_check_pending(struct hci_dev *hdev)
1503 {
1504         struct hci_conn *conn;
1505
1506         BT_DBG("hdev %s", hdev->name);
1507
1508         hci_dev_lock(hdev);
1509
1510         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1511         if (conn)
1512                 hci_acl_create_connection(conn);
1513
1514         hci_dev_unlock(hdev);
1515 }
1516
1517 static u32 get_link_mode(struct hci_conn *conn)
1518 {
1519         u32 link_mode = 0;
1520
1521         if (conn->role == HCI_ROLE_MASTER)
1522                 link_mode |= HCI_LM_MASTER;
1523
1524         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1525                 link_mode |= HCI_LM_ENCRYPT;
1526
1527         if (test_bit(HCI_CONN_AUTH, &conn->flags))
1528                 link_mode |= HCI_LM_AUTH;
1529
1530         if (test_bit(HCI_CONN_SECURE, &conn->flags))
1531                 link_mode |= HCI_LM_SECURE;
1532
1533         if (test_bit(HCI_CONN_FIPS, &conn->flags))
1534                 link_mode |= HCI_LM_FIPS;
1535
1536         return link_mode;
1537 }
1538
1539 int hci_get_conn_list(void __user *arg)
1540 {
1541         struct hci_conn *c;
1542         struct hci_conn_list_req req, *cl;
1543         struct hci_conn_info *ci;
1544         struct hci_dev *hdev;
1545         int n = 0, size, err;
1546
1547         if (copy_from_user(&req, arg, sizeof(req)))
1548                 return -EFAULT;
1549
1550         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1551                 return -EINVAL;
1552
1553         size = sizeof(req) + req.conn_num * sizeof(*ci);
1554
1555         cl = kmalloc(size, GFP_KERNEL);
1556         if (!cl)
1557                 return -ENOMEM;
1558
1559         hdev = hci_dev_get(req.dev_id);
1560         if (!hdev) {
1561                 kfree(cl);
1562                 return -ENODEV;
1563         }
1564
1565         ci = cl->conn_info;
1566
1567         hci_dev_lock(hdev);
1568         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1569                 bacpy(&(ci + n)->bdaddr, &c->dst);
1570                 (ci + n)->handle = c->handle;
1571                 (ci + n)->type  = c->type;
1572                 (ci + n)->out   = c->out;
1573                 (ci + n)->state = c->state;
1574                 (ci + n)->link_mode = get_link_mode(c);
1575                 if (++n >= req.conn_num)
1576                         break;
1577         }
1578         hci_dev_unlock(hdev);
1579
1580         cl->dev_id = hdev->id;
1581         cl->conn_num = n;
1582         size = sizeof(req) + n * sizeof(*ci);
1583
1584         hci_dev_put(hdev);
1585
1586         err = copy_to_user(arg, cl, size);
1587         kfree(cl);
1588
1589         return err ? -EFAULT : 0;
1590 }
1591
1592 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1593 {
1594         struct hci_conn_info_req req;
1595         struct hci_conn_info ci;
1596         struct hci_conn *conn;
1597         char __user *ptr = arg + sizeof(req);
1598
1599         if (copy_from_user(&req, arg, sizeof(req)))
1600                 return -EFAULT;
1601
1602         hci_dev_lock(hdev);
1603         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1604         if (conn) {
1605                 bacpy(&ci.bdaddr, &conn->dst);
1606                 ci.handle = conn->handle;
1607                 ci.type  = conn->type;
1608                 ci.out   = conn->out;
1609                 ci.state = conn->state;
1610                 ci.link_mode = get_link_mode(conn);
1611         }
1612         hci_dev_unlock(hdev);
1613
1614         if (!conn)
1615                 return -ENOENT;
1616
1617         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1618 }
1619
1620 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1621 {
1622         struct hci_auth_info_req req;
1623         struct hci_conn *conn;
1624
1625         if (copy_from_user(&req, arg, sizeof(req)))
1626                 return -EFAULT;
1627
1628         hci_dev_lock(hdev);
1629         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1630         if (conn)
1631                 req.type = conn->auth_type;
1632         hci_dev_unlock(hdev);
1633
1634         if (!conn)
1635                 return -ENOENT;
1636
1637         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1638 }
1639
1640 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1641 {
1642         struct hci_dev *hdev = conn->hdev;
1643         struct hci_chan *chan;
1644
1645         BT_DBG("%s hcon %p", hdev->name, conn);
1646
1647         if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1648                 BT_DBG("Refusing to create new hci_chan");
1649                 return NULL;
1650         }
1651
1652         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1653         if (!chan)
1654                 return NULL;
1655
1656         chan->conn = hci_conn_get(conn);
1657         skb_queue_head_init(&chan->data_q);
1658         chan->state = BT_CONNECTED;
1659
1660         list_add_rcu(&chan->list, &conn->chan_list);
1661
1662         return chan;
1663 }
1664
1665 void hci_chan_del(struct hci_chan *chan)
1666 {
1667         struct hci_conn *conn = chan->conn;
1668         struct hci_dev *hdev = conn->hdev;
1669
1670         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1671
1672         list_del_rcu(&chan->list);
1673
1674         synchronize_rcu();
1675
1676         /* Prevent new hci_chan's to be created for this hci_conn */
1677         set_bit(HCI_CONN_DROP, &conn->flags);
1678
1679         hci_conn_put(conn);
1680
1681         skb_queue_purge(&chan->data_q);
1682         kfree(chan);
1683 }
1684
1685 void hci_chan_list_flush(struct hci_conn *conn)
1686 {
1687         struct hci_chan *chan, *n;
1688
1689         BT_DBG("hcon %p", conn);
1690
1691         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1692                 hci_chan_del(chan);
1693 }
1694
1695 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1696                                                  __u16 handle)
1697 {
1698         struct hci_chan *hchan;
1699
1700         list_for_each_entry(hchan, &hcon->chan_list, list) {
1701                 if (hchan->handle == handle)
1702                         return hchan;
1703         }
1704
1705         return NULL;
1706 }
1707
1708 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1709 {
1710         struct hci_conn_hash *h = &hdev->conn_hash;
1711         struct hci_conn *hcon;
1712         struct hci_chan *hchan = NULL;
1713
1714         rcu_read_lock();
1715
1716         list_for_each_entry_rcu(hcon, &h->list, list) {
1717                 hchan = __hci_chan_lookup_handle(hcon, handle);
1718                 if (hchan)
1719                         break;
1720         }
1721
1722         rcu_read_unlock();
1723
1724         return hchan;
1725 }