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         if (conn->role == HCI_ROLE_MASTER)
 524                 conn->out = true;
 525
 526         switch (type) {
 527         case ACL_LINK:
 528                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 529                 break;
 530         case LE_LINK:
 531                 /* conn->src should reflect the local identity address */
 532                 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
 533                 break;
 534         case SCO_LINK:
 535                 if (lmp_esco_capable(hdev))
 536                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 537                                         (hdev->esco_type & EDR_ESCO_MASK);
 538                 else
 539                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 540                 break;
 541         case ESCO_LINK:
 542                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 543                 break;
 544         }
 545
 546         skb_queue_head_init(&conn->data_q);
 547
 548         INIT_LIST_HEAD(&conn->chan_list);
 549
 550         INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
 551         INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
 552         INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
 553         INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
 554         INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
 555
 556         atomic_set(&conn->refcnt, 0);
 557
 558         hci_dev_hold(hdev);
 559
 560         hci_conn_hash_add(hdev, conn);
 561         if (hdev->notify)
 562                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 563
 564         hci_conn_init_sysfs(conn);
 565
 566         return conn;
 567 }
 568
 569 int hci_conn_del(struct hci_conn *conn)
 570 {
 571         struct hci_dev *hdev = conn->hdev;
 572
 573         BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
 574
 575         cancel_delayed_work_sync(&conn->disc_work);
 576         cancel_delayed_work_sync(&conn->auto_accept_work);
 577         cancel_delayed_work_sync(&conn->idle_work);
 578
 579         if (conn->type == ACL_LINK) {
 580                 struct hci_conn *sco = conn->link;
 581                 if (sco)
 582                         sco->link = NULL;
 583
 584                 /* Unacked frames */
 585                 hdev->acl_cnt += conn->sent;
 586         } else if (conn->type == LE_LINK) {
 587                 cancel_delayed_work(&conn->le_conn_timeout);
 588
 589                 if (hdev->le_pkts)
 590                         hdev->le_cnt += conn->sent;
 591                 else
 592                         hdev->acl_cnt += conn->sent;
 593         } else {
 594                 struct hci_conn *acl = conn->link;
 595                 if (acl) {
 596                         acl->link = NULL;
 597                         hci_conn_drop(acl);
 598                 }
 599         }
 600
 601         if (conn->amp_mgr)
 602                 amp_mgr_put(conn->amp_mgr);
 603
 604         skb_queue_purge(&conn->data_q);
 605
 606         /* Remove the connection from the list and cleanup its remaining
 607          * state. This is a separate function since for some cases like
 608          * BT_CONNECT_SCAN we *only* want the cleanup part without the
 609          * rest of hci_conn_del.
 610          */
 611         hci_conn_cleanup(conn);
 612
 613         return 0;
 614 }
 615
 616 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
 617 {
 618         int use_src = bacmp(src, BDADDR_ANY);
 619         struct hci_dev *hdev = NULL, *d;
 620
 621         BT_DBG("%pMR -> %pMR", src, dst);
 622
 623         read_lock(&hci_dev_list_lock);
 624
 625         list_for_each_entry(d, &hci_dev_list, list) {
 626                 if (!test_bit(HCI_UP, &d->flags) ||
 627                     hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
 628                     d->dev_type != HCI_PRIMARY)
 629                         continue;
 630
 631                 /* Simple routing:
 632                  *   No source address - find interface with bdaddr != dst
 633                  *   Source address    - find interface with bdaddr == src
 634                  */
 635
 636                 if (use_src) {
 637                         if (!bacmp(&d->bdaddr, src)) {
 638                                 hdev = d; break;
 639                         }
 640                 } else {
 641                         if (bacmp(&d->bdaddr, dst)) {
 642                                 hdev = d; break;
 643                         }
 644                 }
 645         }
 646
 647         if (hdev)
 648                 hdev = hci_dev_hold(hdev);
 649
 650         read_unlock(&hci_dev_list_lock);
 651         return hdev;
 652 }
 653 EXPORT_SYMBOL(hci_get_route);
 654
 655 /* This function requires the caller holds hdev->lock */
 656 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 657 {
 658         struct hci_dev *hdev = conn->hdev;
 659         struct hci_conn_params *params;
 660
 661         params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
 662                                            conn->dst_type);
 663         if (params && params->conn) {
 664                 hci_conn_drop(params->conn);
 665                 hci_conn_put(params->conn);
 666                 params->conn = NULL;
 667         }
 668
 669         conn->state = BT_CLOSED;
 670
 671         /* If the status indicates successful cancellation of
 672          * the attempt (i.e. Unkown Connection Id) there's no point of
 673          * notifying failure since we'll go back to keep trying to
 674          * connect. The only exception is explicit connect requests
 675          * where a timeout + cancel does indicate an actual failure.
 676          */
 677         if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
 678             (params && params->explicit_connect))
 679                 mgmt_connect_failed(hdev, &conn->dst, conn->type,
 680                                     conn->dst_type, status);
 681
 682         hci_connect_cfm(conn, status);
 683
 684         hci_conn_del(conn);
 685
 686         /* Since we may have temporarily stopped the background scanning in
 687          * favor of connection establishment, we should restart it.
 688          */
 689         hci_update_background_scan(hdev);
 690
 691         /* Re-enable advertising in case this was a failed connection
 692          * attempt as a peripheral.
 693          */
 694         hci_req_reenable_advertising(hdev);
 695 }
 696
 697 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 698 {
 699         struct hci_conn *conn;
 700
 701         hci_dev_lock(hdev);
 702
 703         conn = hci_lookup_le_connect(hdev);
 704
 705         if (!status) {
 706                 hci_connect_le_scan_cleanup(conn);
 707                 goto done;
 708         }
 709
 710         BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
 711                status);
 712
 713         if (!conn)
 714                 goto done;
 715
 716         hci_le_conn_failed(conn, status);
 717
 718 done:
 719         hci_dev_unlock(hdev);
 720 }
 721
 722 static bool conn_use_rpa(struct hci_conn *conn)
 723 {
 724         struct hci_dev *hdev = conn->hdev;
 725
 726         return hci_dev_test_flag(hdev, HCI_PRIVACY);
 727 }
 728
 729 static void hci_req_add_le_create_conn(struct hci_request *req,
 730                                        struct hci_conn *conn)
 731 {
 732         struct hci_cp_le_create_conn cp;
 733         struct hci_dev *hdev = conn->hdev;
 734         u8 own_addr_type;
 735
 736         /* Update random address, but set require_privacy to false so
 737          * that we never connect with an non-resolvable address.
 738          */
 739         if (hci_update_random_address(req, false, conn_use_rpa(conn),
 740                                       &own_addr_type))
 741                 return;
 742
 743         memset(&cp, 0, sizeof(cp));
 744
 745         /* Set window to be the same value as the interval to enable
 746          * continuous scanning.
 747          */
 748         cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
 749         cp.scan_window = cp.scan_interval;
 750
 751         bacpy(&cp.peer_addr, &conn->dst);
 752         cp.peer_addr_type = conn->dst_type;
 753         cp.own_address_type = own_addr_type;
 754         cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 755         cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 756         cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
 757         cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 758         cp.min_ce_len = cpu_to_le16(0x0000);
 759         cp.max_ce_len = cpu_to_le16(0x0000);
 760
 761         hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 762
 763         conn->state = BT_CONNECT;
 764         clear_bit(HCI_CONN_SCANNING, &conn->flags);
 765 }
 766
 767 static void hci_req_directed_advertising(struct hci_request *req,
 768                                          struct hci_conn *conn)
 769 {
 770         struct hci_dev *hdev = req->hdev;
 771         struct hci_cp_le_set_adv_param cp;
 772         u8 own_addr_type;
 773         u8 enable;
 774
 775         /* Clear the HCI_LE_ADV bit temporarily so that the
 776          * hci_update_random_address knows that it's safe to go ahead
 777          * and write a new random address. The flag will be set back on
 778          * as soon as the SET_ADV_ENABLE HCI command completes.
 779          */
 780         hci_dev_clear_flag(hdev, HCI_LE_ADV);
 781
 782         /* Set require_privacy to false so that the remote device has a
 783          * chance of identifying us.
 784          */
 785         if (hci_update_random_address(req, false, conn_use_rpa(conn),
 786                                       &own_addr_type) < 0)
 787                 return;
 788
 789         memset(&cp, 0, sizeof(cp));
 790         cp.type = LE_ADV_DIRECT_IND;
 791         cp.own_address_type = own_addr_type;
 792         cp.direct_addr_type = conn->dst_type;
 793         bacpy(&cp.direct_addr, &conn->dst);
 794         cp.channel_map = hdev->le_adv_channel_map;
 795
 796         hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
 797
 798         enable = 0x01;
 799         hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
 800
 801         conn->state = BT_CONNECT;
 802 }
 803
 804 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 805                                 u8 dst_type, u8 sec_level, u16 conn_timeout,
 806                                 u8 role)
 807 {
 808         struct hci_conn_params *params;
 809         struct hci_conn *conn;
 810         struct smp_irk *irk;
 811         struct hci_request req;
 812         int err;
 813
 814         /* Let's make sure that le is enabled.*/
 815         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
 816                 if (lmp_le_capable(hdev))
 817                         return ERR_PTR(-ECONNREFUSED);
 818
 819                 return ERR_PTR(-EOPNOTSUPP);
 820         }
 821
 822         /* Since the controller supports only one LE connection attempt at a
 823          * time, we return -EBUSY if there is any connection attempt running.
 824          */
 825         if (hci_lookup_le_connect(hdev))
 826                 return ERR_PTR(-EBUSY);
 827
 828         /* If there's already a connection object but it's not in
 829          * scanning state it means it must already be established, in
 830          * which case we can't do anything else except report a failure
 831          * to connect.
 832          */
 833         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
 834         if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 835                 return ERR_PTR(-EBUSY);
 836         }
 837
 838         /* When given an identity address with existing identity
 839          * resolving key, the connection needs to be established
 840          * to a resolvable random address.
 841          *
 842          * Storing the resolvable random address is required here
 843          * to handle connection failures. The address will later
 844          * be resolved back into the original identity address
 845          * from the connect request.
 846          */
 847         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
 848         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
 849                 dst = &irk->rpa;
 850                 dst_type = ADDR_LE_DEV_RANDOM;
 851         }
 852
 853         if (conn) {
 854                 bacpy(&conn->dst, dst);
 855         } else {
 856                 conn = hci_conn_add(hdev, LE_LINK, dst, role);
 857                 if (!conn)
 858                         return ERR_PTR(-ENOMEM);
 859                 hci_conn_hold(conn);
 860                 conn->pending_sec_level = sec_level;
 861         }
 862
 863         conn->dst_type = dst_type;
 864         conn->sec_level = BT_SECURITY_LOW;
 865         conn->conn_timeout = conn_timeout;
 866
 867         hci_req_init(&req, hdev);
 868
 869         /* Disable advertising if we're active. For master role
 870          * connections most controllers will refuse to connect if
 871          * advertising is enabled, and for slave role connections we
 872          * anyway have to disable it in order to start directed
 873          * advertising.
 874          */
 875         if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
 876                 u8 enable = 0x00;
 877                 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 878                             &enable);
 879         }
 880
 881         /* If requested to connect as slave use directed advertising */
 882         if (conn->role == HCI_ROLE_SLAVE) {
 883                 /* If we're active scanning most controllers are unable
 884                  * to initiate advertising. Simply reject the attempt.
 885                  */
 886                 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
 887                     hdev->le_scan_type == LE_SCAN_ACTIVE) {
 888                         skb_queue_purge(&req.cmd_q);
 889                         hci_conn_del(conn);
 890                         return ERR_PTR(-EBUSY);
 891                 }
 892
 893                 hci_req_directed_advertising(&req, conn);
 894                 goto create_conn;
 895         }
 896
 897         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 898         if (params) {
 899                 conn->le_conn_min_interval = params->conn_min_interval;
 900                 conn->le_conn_max_interval = params->conn_max_interval;
 901                 conn->le_conn_latency = params->conn_latency;
 902                 conn->le_supv_timeout = params->supervision_timeout;
 903         } else {
 904                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
 905                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
 906                 conn->le_conn_latency = hdev->le_conn_latency;
 907                 conn->le_supv_timeout = hdev->le_supv_timeout;
 908         }
 909
 910         /* If controller is scanning, we stop it since some controllers are
 911          * not able to scan and connect at the same time. Also set the
 912          * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
 913          * handler for scan disabling knows to set the correct discovery
 914          * state.
 915          */
 916         if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
 917                 hci_req_add_le_scan_disable(&req);
 918                 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
 919         }
 920
 921         hci_req_add_le_create_conn(&req, conn);
 922
 923 create_conn:
 924         err = hci_req_run(&req, create_le_conn_complete);
 925         if (err) {
 926                 hci_conn_del(conn);
 927                 return ERR_PTR(err);
 928         }
 929
 930         return conn;
 931 }
 932
 933 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
 934 {
 935         struct hci_conn *conn;
 936
 937         conn = hci_conn_hash_lookup_le(hdev, addr, type);
 938         if (!conn)
 939                 return false;
 940
 941         if (conn->state != BT_CONNECTED)
 942                 return false;
 943
 944         return true;
 945 }
 946
 947 /* This function requires the caller holds hdev->lock */
 948 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
 949                                         bdaddr_t *addr, u8 addr_type)
 950 {
 951         struct hci_conn_params *params;
 952
 953         if (is_connected(hdev, addr, addr_type))
 954                 return -EISCONN;
 955
 956         params = hci_conn_params_lookup(hdev, addr, addr_type);
 957         if (!params) {
 958                 params = hci_conn_params_add(hdev, addr, addr_type);
 959                 if (!params)
 960                         return -ENOMEM;
 961
 962                 /* If we created new params, mark them to be deleted in
 963                  * hci_connect_le_scan_cleanup. It's different case than
 964                  * existing disabled params, those will stay after cleanup.
 965                  */
 966                 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
 967         }
 968
 969         /* We're trying to connect, so make sure params are at pend_le_conns */
 970         if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
 971             params->auto_connect == HCI_AUTO_CONN_REPORT ||
 972             params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
 973                 list_del_init(&params->action);
 974                 list_add(&params->action, &hdev->pend_le_conns);
 975         }
 976
 977         params->explicit_connect = true;
 978
 979         BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
 980                params->auto_connect);
 981
 982         return 0;
 983 }
 984
 985 /* This function requires the caller holds hdev->lock */
 986 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
 987                                      u8 dst_type, u8 sec_level,
 988                                      u16 conn_timeout)
 989 {
 990         struct hci_conn *conn;
 991
 992         /* Let's make sure that le is enabled.*/
 993         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
 994                 if (lmp_le_capable(hdev))
 995                         return ERR_PTR(-ECONNREFUSED);
 996
 997                 return ERR_PTR(-EOPNOTSUPP);
 998         }
 999
1000         /* Some devices send ATT messages as soon as the physical link is
1001          * established. To be able to handle these ATT messages, the user-
1002          * space first establishes the connection and then starts the pairing
1003          * process.
1004          *
1005          * So if a hci_conn object already exists for the following connection
1006          * attempt, we simply update pending_sec_level and auth_type fields
1007          * and return the object found.
1008          */
1009         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1010         if (conn) {
1011                 if (conn->pending_sec_level < sec_level)
1012                         conn->pending_sec_level = sec_level;
1013                 goto done;
1014         }
1015
1016         BT_DBG("requesting refresh of dst_addr");
1017
1018         conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1019         if (!conn)
1020                 return ERR_PTR(-ENOMEM);
1021
1022         if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0)
1023                 return ERR_PTR(-EBUSY);
1024
1025         conn->state = BT_CONNECT;
1026         set_bit(HCI_CONN_SCANNING, &conn->flags);
1027         conn->dst_type = dst_type;
1028         conn->sec_level = BT_SECURITY_LOW;
1029         conn->pending_sec_level = sec_level;
1030         conn->conn_timeout = conn_timeout;
1031
1032         hci_update_background_scan(hdev);
1033
1034 done:
1035         hci_conn_hold(conn);
1036         return conn;
1037 }
1038
1039 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1040                                  u8 sec_level, u8 auth_type)
1041 {
1042         struct hci_conn *acl;
1043
1044         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1045                 if (lmp_bredr_capable(hdev))
1046                         return ERR_PTR(-ECONNREFUSED);
1047
1048                 return ERR_PTR(-EOPNOTSUPP);
1049         }
1050
1051         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1052         if (!acl) {
1053                 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1054                 if (!acl)
1055                         return ERR_PTR(-ENOMEM);
1056         }
1057
1058         hci_conn_hold(acl);
1059
1060         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1061                 acl->sec_level = BT_SECURITY_LOW;
1062                 acl->pending_sec_level = sec_level;
1063                 acl->auth_type = auth_type;
1064                 hci_acl_create_connection(acl);
1065         }
1066
1067         return acl;
1068 }
1069
1070 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1071                                  __u16 setting)
1072 {
1073         struct hci_conn *acl;
1074         struct hci_conn *sco;
1075
1076         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1077         if (IS_ERR(acl))
1078                 return acl;
1079
1080         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1081         if (!sco) {
1082                 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1083                 if (!sco) {
1084                         hci_conn_drop(acl);
1085                         return ERR_PTR(-ENOMEM);
1086                 }
1087         }
1088
1089         acl->link = sco;
1090         sco->link = acl;
1091
1092         hci_conn_hold(sco);
1093
1094         sco->setting = setting;
1095
1096         if (acl->state == BT_CONNECTED &&
1097             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1098                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1099                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1100
1101                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1102                         /* defer SCO setup until mode change completed */
1103                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1104                         return sco;
1105                 }
1106
1107                 hci_sco_setup(acl, 0x00);
1108         }
1109
1110         return sco;
1111 }
1112
1113 /* Check link security requirement */
1114 int hci_conn_check_link_mode(struct hci_conn *conn)
1115 {
1116         BT_DBG("hcon %p", conn);
1117
1118         /* In Secure Connections Only mode, it is required that Secure
1119          * Connections is used and the link is encrypted with AES-CCM
1120          * using a P-256 authenticated combination key.
1121          */
1122         if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1123                 if (!hci_conn_sc_enabled(conn) ||
1124                     !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1125                     conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1126                         return 0;
1127         }
1128
1129         if (hci_conn_ssp_enabled(conn) &&
1130             !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1131                 return 0;
1132
1133         return 1;
1134 }
1135
1136 /* Authenticate remote device */
1137 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1138 {
1139         BT_DBG("hcon %p", conn);
1140
1141         if (conn->pending_sec_level > sec_level)
1142                 sec_level = conn->pending_sec_level;
1143
1144         if (sec_level > conn->sec_level)
1145                 conn->pending_sec_level = sec_level;
1146         else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1147                 return 1;
1148
1149         /* Make sure we preserve an existing MITM requirement*/
1150         auth_type |= (conn->auth_type & 0x01);
1151
1152         conn->auth_type = auth_type;
1153
1154         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1155                 struct hci_cp_auth_requested cp;
1156
1157                 cp.handle = cpu_to_le16(conn->handle);
1158                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1159                              sizeof(cp), &cp);
1160
1161                 /* If we're already encrypted set the REAUTH_PEND flag,
1162                  * otherwise set the ENCRYPT_PEND.
1163                  */
1164                 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1165                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1166                 else
1167                         set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1168         }
1169
1170         return 0;
1171 }
1172
1173 /* Encrypt the the link */
1174 static void hci_conn_encrypt(struct hci_conn *conn)
1175 {
1176         BT_DBG("hcon %p", conn);
1177
1178         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1179                 struct hci_cp_set_conn_encrypt cp;
1180                 cp.handle  = cpu_to_le16(conn->handle);
1181                 cp.encrypt = 0x01;
1182                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1183                              &cp);
1184         }
1185 }
1186
1187 /* Enable security */
1188 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1189                       bool initiator)
1190 {
1191         BT_DBG("hcon %p", conn);
1192
1193         if (conn->type == LE_LINK)
1194                 return smp_conn_security(conn, sec_level);
1195
1196         /* For sdp we don't need the link key. */
1197         if (sec_level == BT_SECURITY_SDP)
1198                 return 1;
1199
1200         /* For non 2.1 devices and low security level we don't need the link
1201            key. */
1202         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1203                 return 1;
1204
1205         /* For other security levels we need the link key. */
1206         if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1207                 goto auth;
1208
1209         /* An authenticated FIPS approved combination key has sufficient
1210          * security for security level 4. */
1211         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1212             sec_level == BT_SECURITY_FIPS)
1213                 goto encrypt;
1214
1215         /* An authenticated combination key has sufficient security for
1216            security level 3. */
1217         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1218              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1219             sec_level == BT_SECURITY_HIGH)
1220                 goto encrypt;
1221
1222         /* An unauthenticated combination key has sufficient security for
1223            security level 1 and 2. */
1224         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1225              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1226             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1227                 goto encrypt;
1228
1229         /* A combination key has always sufficient security for the security
1230            levels 1 or 2. High security level requires the combination key
1231            is generated using maximum PIN code length (16).
1232            For pre 2.1 units. */
1233         if (conn->key_type == HCI_LK_COMBINATION &&
1234             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1235              conn->pin_length == 16))
1236                 goto encrypt;
1237
1238 auth:
1239         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1240                 return 0;
1241
1242         if (initiator)
1243                 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1244
1245         if (!hci_conn_auth(conn, sec_level, auth_type))
1246                 return 0;
1247
1248 encrypt:
1249         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1250                 return 1;
1251
1252         hci_conn_encrypt(conn);
1253         return 0;
1254 }
1255 EXPORT_SYMBOL(hci_conn_security);
1256
1257 /* Check secure link requirement */
1258 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1259 {
1260         BT_DBG("hcon %p", conn);
1261
1262         /* Accept if non-secure or higher security level is required */
1263         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1264                 return 1;
1265
1266         /* Accept if secure or higher security level is already present */
1267         if (conn->sec_level == BT_SECURITY_HIGH ||
1268             conn->sec_level == BT_SECURITY_FIPS)
1269                 return 1;
1270
1271         /* Reject not secure link */
1272         return 0;
1273 }
1274 EXPORT_SYMBOL(hci_conn_check_secure);
1275
1276 /* Switch role */
1277 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1278 {
1279         BT_DBG("hcon %p", conn);
1280
1281         if (role == conn->role)
1282                 return 1;
1283
1284         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1285                 struct hci_cp_switch_role cp;
1286                 bacpy(&cp.bdaddr, &conn->dst);
1287                 cp.role = role;
1288                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1289         }
1290
1291         return 0;
1292 }
1293 EXPORT_SYMBOL(hci_conn_switch_role);
1294
1295 /* Enter active mode */
1296 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1297 {
1298         struct hci_dev *hdev = conn->hdev;
1299
1300         BT_DBG("hcon %p mode %d", conn, conn->mode);
1301
1302         if (conn->mode != HCI_CM_SNIFF)
1303                 goto timer;
1304
1305         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1306                 goto timer;
1307
1308         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1309                 struct hci_cp_exit_sniff_mode cp;
1310                 cp.handle = cpu_to_le16(conn->handle);
1311                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1312         }
1313
1314 timer:
1315         if (hdev->idle_timeout > 0)
1316                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1317                                    msecs_to_jiffies(hdev->idle_timeout));
1318 }
1319
1320 /* Drop all connection on the device */
1321 void hci_conn_hash_flush(struct hci_dev *hdev)
1322 {
1323         struct hci_conn_hash *h = &hdev->conn_hash;
1324         struct hci_conn *c, *n;
1325
1326         BT_DBG("hdev %s", hdev->name);
1327
1328         list_for_each_entry_safe(c, n, &h->list, list) {
1329                 c->state = BT_CLOSED;
1330
1331                 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1332                 hci_conn_del(c);
1333         }
1334 }
1335
1336 /* Check pending connect attempts */
1337 void hci_conn_check_pending(struct hci_dev *hdev)
1338 {
1339         struct hci_conn *conn;
1340
1341         BT_DBG("hdev %s", hdev->name);
1342
1343         hci_dev_lock(hdev);
1344
1345         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1346         if (conn)
1347                 hci_acl_create_connection(conn);
1348
1349         hci_dev_unlock(hdev);
1350 }
1351
1352 static u32 get_link_mode(struct hci_conn *conn)
1353 {
1354         u32 link_mode = 0;
1355
1356         if (conn->role == HCI_ROLE_MASTER)
1357                 link_mode |= HCI_LM_MASTER;
1358
1359         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1360                 link_mode |= HCI_LM_ENCRYPT;
1361
1362         if (test_bit(HCI_CONN_AUTH, &conn->flags))
1363                 link_mode |= HCI_LM_AUTH;
1364
1365         if (test_bit(HCI_CONN_SECURE, &conn->flags))
1366                 link_mode |= HCI_LM_SECURE;
1367
1368         if (test_bit(HCI_CONN_FIPS, &conn->flags))
1369                 link_mode |= HCI_LM_FIPS;
1370
1371         return link_mode;
1372 }
1373
1374 int hci_get_conn_list(void __user *arg)
1375 {
1376         struct hci_conn *c;
1377         struct hci_conn_list_req req, *cl;
1378         struct hci_conn_info *ci;
1379         struct hci_dev *hdev;
1380         int n = 0, size, err;
1381
1382         if (copy_from_user(&req, arg, sizeof(req)))
1383                 return -EFAULT;
1384
1385         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1386                 return -EINVAL;
1387
1388         size = sizeof(req) + req.conn_num * sizeof(*ci);
1389
1390         cl = kmalloc(size, GFP_KERNEL);
1391         if (!cl)
1392                 return -ENOMEM;
1393
1394         hdev = hci_dev_get(req.dev_id);
1395         if (!hdev) {
1396                 kfree(cl);
1397                 return -ENODEV;
1398         }
1399
1400         ci = cl->conn_info;
1401
1402         hci_dev_lock(hdev);
1403         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1404                 bacpy(&(ci + n)->bdaddr, &c->dst);
1405                 (ci + n)->handle = c->handle;
1406                 (ci + n)->type  = c->type;
1407                 (ci + n)->out   = c->out;
1408                 (ci + n)->state = c->state;
1409                 (ci + n)->link_mode = get_link_mode(c);
1410                 if (++n >= req.conn_num)
1411                         break;
1412         }
1413         hci_dev_unlock(hdev);
1414
1415         cl->dev_id = hdev->id;
1416         cl->conn_num = n;
1417         size = sizeof(req) + n * sizeof(*ci);
1418
1419         hci_dev_put(hdev);
1420
1421         err = copy_to_user(arg, cl, size);
1422         kfree(cl);
1423
1424         return err ? -EFAULT : 0;
1425 }
1426
1427 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1428 {
1429         struct hci_conn_info_req req;
1430         struct hci_conn_info ci;
1431         struct hci_conn *conn;
1432         char __user *ptr = arg + sizeof(req);
1433
1434         if (copy_from_user(&req, arg, sizeof(req)))
1435                 return -EFAULT;
1436
1437         hci_dev_lock(hdev);
1438         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1439         if (conn) {
1440                 bacpy(&ci.bdaddr, &conn->dst);
1441                 ci.handle = conn->handle;
1442                 ci.type  = conn->type;
1443                 ci.out   = conn->out;
1444                 ci.state = conn->state;
1445                 ci.link_mode = get_link_mode(conn);
1446         }
1447         hci_dev_unlock(hdev);
1448
1449         if (!conn)
1450                 return -ENOENT;
1451
1452         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1453 }
1454
1455 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1456 {
1457         struct hci_auth_info_req req;
1458         struct hci_conn *conn;
1459
1460         if (copy_from_user(&req, arg, sizeof(req)))
1461                 return -EFAULT;
1462
1463         hci_dev_lock(hdev);
1464         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1465         if (conn)
1466                 req.type = conn->auth_type;
1467         hci_dev_unlock(hdev);
1468
1469         if (!conn)
1470                 return -ENOENT;
1471
1472         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1473 }
1474
1475 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1476 {
1477         struct hci_dev *hdev = conn->hdev;
1478         struct hci_chan *chan;
1479
1480         BT_DBG("%s hcon %p", hdev->name, conn);
1481
1482         if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1483                 BT_DBG("Refusing to create new hci_chan");
1484                 return NULL;
1485         }
1486
1487         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1488         if (!chan)
1489                 return NULL;
1490
1491         chan->conn = hci_conn_get(conn);
1492         skb_queue_head_init(&chan->data_q);
1493         chan->state = BT_CONNECTED;
1494
1495         list_add_rcu(&chan->list, &conn->chan_list);
1496
1497         return chan;
1498 }
1499
1500 void hci_chan_del(struct hci_chan *chan)
1501 {
1502         struct hci_conn *conn = chan->conn;
1503         struct hci_dev *hdev = conn->hdev;
1504
1505         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1506
1507         list_del_rcu(&chan->list);
1508
1509         synchronize_rcu();
1510
1511         /* Prevent new hci_chan's to be created for this hci_conn */
1512         set_bit(HCI_CONN_DROP, &conn->flags);
1513
1514         hci_conn_put(conn);
1515
1516         skb_queue_purge(&chan->data_q);
1517         kfree(chan);
1518 }
1519
1520 void hci_chan_list_flush(struct hci_conn *conn)
1521 {
1522         struct hci_chan *chan, *n;
1523
1524         BT_DBG("hcon %p", conn);
1525
1526         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1527                 hci_chan_del(chan);
1528 }
1529
1530 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1531                                                  __u16 handle)
1532 {
1533         struct hci_chan *hchan;
1534
1535         list_for_each_entry(hchan, &hcon->chan_list, list) {
1536                 if (hchan->handle == handle)
1537                         return hchan;
1538         }
1539
1540         return NULL;
1541 }
1542
1543 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1544 {
1545         struct hci_conn_hash *h = &hdev->conn_hash;
1546         struct hci_conn *hcon;
1547         struct hci_chan *hchan = NULL;
1548
1549         rcu_read_lock();
1550
1551         list_for_each_entry_rcu(hcon, &h->list, list) {
1552                 hchan = __hci_chan_lookup_handle(hcon, handle);
1553                 if (hchan)
1554                         break;
1555         }
1556
1557         rcu_read_unlock();
1558
1559         return hchan;
1560 }