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, uint8_t src_type)
 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                         bdaddr_t id_addr;
 638                         u8 id_addr_type;
 639
 640                         if (src_type == BDADDR_BREDR) {
 641                                 if (!lmp_bredr_capable(d))
 642                                         continue;
 643                                 bacpy(&id_addr, &d->bdaddr);
 644                                 id_addr_type = BDADDR_BREDR;
 645                         } else {
 646                                 if (!lmp_le_capable(d))
 647                                         continue;
 648
 649                                 hci_copy_identity_address(d, &id_addr,
 650                                                           &id_addr_type);
 651
 652                                 /* Convert from HCI to three-value type */
 653                                 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
 654                                         id_addr_type = BDADDR_LE_PUBLIC;
 655                                 else
 656                                         id_addr_type = BDADDR_LE_RANDOM;
 657                         }
 658
 659                         if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
 660                                 hdev = d; break;
 661                         }
 662                 } else {
 663                         if (bacmp(&d->bdaddr, dst)) {
 664                                 hdev = d; break;
 665                         }
 666                 }
 667         }
 668
 669         if (hdev)
 670                 hdev = hci_dev_hold(hdev);
 671
 672         read_unlock(&hci_dev_list_lock);
 673         return hdev;
 674 }
 675 EXPORT_SYMBOL(hci_get_route);
 676
 677 /* This function requires the caller holds hdev->lock */
 678 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 679 {
 680         struct hci_dev *hdev = conn->hdev;
 681         struct hci_conn_params *params;
 682
 683         params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
 684                                            conn->dst_type);
 685         if (params && params->conn) {
 686                 hci_conn_drop(params->conn);
 687                 hci_conn_put(params->conn);
 688                 params->conn = NULL;
 689         }
 690
 691         conn->state = BT_CLOSED;
 692
 693         /* If the status indicates successful cancellation of
 694          * the attempt (i.e. Unkown Connection Id) there's no point of
 695          * notifying failure since we'll go back to keep trying to
 696          * connect. The only exception is explicit connect requests
 697          * where a timeout + cancel does indicate an actual failure.
 698          */
 699         if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
 700             (params && params->explicit_connect))
 701                 mgmt_connect_failed(hdev, &conn->dst, conn->type,
 702                                     conn->dst_type, status);
 703
 704         hci_connect_cfm(conn, status);
 705
 706         hci_conn_del(conn);
 707
 708         /* Since we may have temporarily stopped the background scanning in
 709          * favor of connection establishment, we should restart it.
 710          */
 711         hci_update_background_scan(hdev);
 712
 713         /* Re-enable advertising in case this was a failed connection
 714          * attempt as a peripheral.
 715          */
 716         hci_req_reenable_advertising(hdev);
 717 }
 718
 719 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 720 {
 721         struct hci_conn *conn;
 722
 723         hci_dev_lock(hdev);
 724
 725         conn = hci_lookup_le_connect(hdev);
 726
 727         if (!status) {
 728                 hci_connect_le_scan_cleanup(conn);
 729                 goto done;
 730         }
 731
 732         BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
 733                status);
 734
 735         if (!conn)
 736                 goto done;
 737
 738         hci_le_conn_failed(conn, status);
 739
 740 done:
 741         hci_dev_unlock(hdev);
 742 }
 743
 744 static bool conn_use_rpa(struct hci_conn *conn)
 745 {
 746         struct hci_dev *hdev = conn->hdev;
 747
 748         return hci_dev_test_flag(hdev, HCI_PRIVACY);
 749 }
 750
 751 static void hci_req_add_le_create_conn(struct hci_request *req,
 752                                        struct hci_conn *conn)
 753 {
 754         struct hci_cp_le_create_conn cp;
 755         struct hci_dev *hdev = conn->hdev;
 756         u8 own_addr_type;
 757
 758         /* Update random address, but set require_privacy to false so
 759          * that we never connect with an non-resolvable address.
 760          */
 761         if (hci_update_random_address(req, false, conn_use_rpa(conn),
 762                                       &own_addr_type))
 763                 return;
 764
 765         memset(&cp, 0, sizeof(cp));
 766
 767         /* Set window to be the same value as the interval to enable
 768          * continuous scanning.
 769          */
 770         cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
 771         cp.scan_window = cp.scan_interval;
 772
 773         bacpy(&cp.peer_addr, &conn->dst);
 774         cp.peer_addr_type = conn->dst_type;
 775         cp.own_address_type = own_addr_type;
 776         cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 777         cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 778         cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
 779         cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 780         cp.min_ce_len = cpu_to_le16(0x0000);
 781         cp.max_ce_len = cpu_to_le16(0x0000);
 782
 783         hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 784
 785         conn->state = BT_CONNECT;
 786         clear_bit(HCI_CONN_SCANNING, &conn->flags);
 787 }
 788
 789 static void hci_req_directed_advertising(struct hci_request *req,
 790                                          struct hci_conn *conn)
 791 {
 792         struct hci_dev *hdev = req->hdev;
 793         struct hci_cp_le_set_adv_param cp;
 794         u8 own_addr_type;
 795         u8 enable;
 796
 797         /* Clear the HCI_LE_ADV bit temporarily so that the
 798          * hci_update_random_address knows that it's safe to go ahead
 799          * and write a new random address. The flag will be set back on
 800          * as soon as the SET_ADV_ENABLE HCI command completes.
 801          */
 802         hci_dev_clear_flag(hdev, HCI_LE_ADV);
 803
 804         /* Set require_privacy to false so that the remote device has a
 805          * chance of identifying us.
 806          */
 807         if (hci_update_random_address(req, false, conn_use_rpa(conn),
 808                                       &own_addr_type) < 0)
 809                 return;
 810
 811         memset(&cp, 0, sizeof(cp));
 812         cp.type = LE_ADV_DIRECT_IND;
 813         cp.own_address_type = own_addr_type;
 814         cp.direct_addr_type = conn->dst_type;
 815         bacpy(&cp.direct_addr, &conn->dst);
 816         cp.channel_map = hdev->le_adv_channel_map;
 817
 818         hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
 819
 820         enable = 0x01;
 821         hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
 822
 823         conn->state = BT_CONNECT;
 824 }
 825
 826 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 827                                 u8 dst_type, u8 sec_level, u16 conn_timeout,
 828                                 u8 role)
 829 {
 830         struct hci_conn_params *params;
 831         struct hci_conn *conn;
 832         struct smp_irk *irk;
 833         struct hci_request req;
 834         int err;
 835
 836         /* Let's make sure that le is enabled.*/
 837         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
 838                 if (lmp_le_capable(hdev))
 839                         return ERR_PTR(-ECONNREFUSED);
 840
 841                 return ERR_PTR(-EOPNOTSUPP);
 842         }
 843
 844         /* Since the controller supports only one LE connection attempt at a
 845          * time, we return -EBUSY if there is any connection attempt running.
 846          */
 847         if (hci_lookup_le_connect(hdev))
 848                 return ERR_PTR(-EBUSY);
 849
 850         /* If there's already a connection object but it's not in
 851          * scanning state it means it must already be established, in
 852          * which case we can't do anything else except report a failure
 853          * to connect.
 854          */
 855         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
 856         if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 857                 return ERR_PTR(-EBUSY);
 858         }
 859
 860         /* When given an identity address with existing identity
 861          * resolving key, the connection needs to be established
 862          * to a resolvable random address.
 863          *
 864          * Storing the resolvable random address is required here
 865          * to handle connection failures. The address will later
 866          * be resolved back into the original identity address
 867          * from the connect request.
 868          */
 869         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
 870         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
 871                 dst = &irk->rpa;
 872                 dst_type = ADDR_LE_DEV_RANDOM;
 873         }
 874
 875         if (conn) {
 876                 bacpy(&conn->dst, dst);
 877         } else {
 878                 conn = hci_conn_add(hdev, LE_LINK, dst, role);
 879                 if (!conn)
 880                         return ERR_PTR(-ENOMEM);
 881                 hci_conn_hold(conn);
 882                 conn->pending_sec_level = sec_level;
 883         }
 884
 885         conn->dst_type = dst_type;
 886         conn->sec_level = BT_SECURITY_LOW;
 887         conn->conn_timeout = conn_timeout;
 888
 889         hci_req_init(&req, hdev);
 890
 891         /* Disable advertising if we're active. For master role
 892          * connections most controllers will refuse to connect if
 893          * advertising is enabled, and for slave role connections we
 894          * anyway have to disable it in order to start directed
 895          * advertising.
 896          */
 897         if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
 898                 u8 enable = 0x00;
 899                 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 900                             &enable);
 901         }
 902
 903         /* If requested to connect as slave use directed advertising */
 904         if (conn->role == HCI_ROLE_SLAVE) {
 905                 /* If we're active scanning most controllers are unable
 906                  * to initiate advertising. Simply reject the attempt.
 907                  */
 908                 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
 909                     hdev->le_scan_type == LE_SCAN_ACTIVE) {
 910                         skb_queue_purge(&req.cmd_q);
 911                         hci_conn_del(conn);
 912                         return ERR_PTR(-EBUSY);
 913                 }
 914
 915                 hci_req_directed_advertising(&req, conn);
 916                 goto create_conn;
 917         }
 918
 919         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 920         if (params) {
 921                 conn->le_conn_min_interval = params->conn_min_interval;
 922                 conn->le_conn_max_interval = params->conn_max_interval;
 923                 conn->le_conn_latency = params->conn_latency;
 924                 conn->le_supv_timeout = params->supervision_timeout;
 925         } else {
 926                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
 927                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
 928                 conn->le_conn_latency = hdev->le_conn_latency;
 929                 conn->le_supv_timeout = hdev->le_supv_timeout;
 930         }
 931
 932         /* If controller is scanning, we stop it since some controllers are
 933          * not able to scan and connect at the same time. Also set the
 934          * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
 935          * handler for scan disabling knows to set the correct discovery
 936          * state.
 937          */
 938         if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
 939                 hci_req_add_le_scan_disable(&req);
 940                 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
 941         }
 942
 943         hci_req_add_le_create_conn(&req, conn);
 944
 945 create_conn:
 946         err = hci_req_run(&req, create_le_conn_complete);
 947         if (err) {
 948                 hci_conn_del(conn);
 949                 return ERR_PTR(err);
 950         }
 951
 952         return conn;
 953 }
 954
 955 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
 956 {
 957         struct hci_conn *conn;
 958
 959         conn = hci_conn_hash_lookup_le(hdev, addr, type);
 960         if (!conn)
 961                 return false;
 962
 963         if (conn->state != BT_CONNECTED)
 964                 return false;
 965
 966         return true;
 967 }
 968
 969 /* This function requires the caller holds hdev->lock */
 970 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
 971                                         bdaddr_t *addr, u8 addr_type)
 972 {
 973         struct hci_conn_params *params;
 974
 975         if (is_connected(hdev, addr, addr_type))
 976                 return -EISCONN;
 977
 978         params = hci_conn_params_lookup(hdev, addr, addr_type);
 979         if (!params) {
 980                 params = hci_conn_params_add(hdev, addr, addr_type);
 981                 if (!params)
 982                         return -ENOMEM;
 983
 984                 /* If we created new params, mark them to be deleted in
 985                  * hci_connect_le_scan_cleanup. It's different case than
 986                  * existing disabled params, those will stay after cleanup.
 987                  */
 988                 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
 989         }
 990
 991         /* We're trying to connect, so make sure params are at pend_le_conns */
 992         if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
 993             params->auto_connect == HCI_AUTO_CONN_REPORT ||
 994             params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
 995                 list_del_init(&params->action);
 996                 list_add(&params->action, &hdev->pend_le_conns);
 997         }
 998
 999         params->explicit_connect = true;
1000
1001         BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1002                params->auto_connect);
1003
1004         return 0;
1005 }
1006
1007 /* This function requires the caller holds hdev->lock */
1008 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1009                                      u8 dst_type, u8 sec_level,
1010                                      u16 conn_timeout)
1011 {
1012         struct hci_conn *conn;
1013
1014         /* Let's make sure that le is enabled.*/
1015         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1016                 if (lmp_le_capable(hdev))
1017                         return ERR_PTR(-ECONNREFUSED);
1018
1019                 return ERR_PTR(-EOPNOTSUPP);
1020         }
1021
1022         /* Some devices send ATT messages as soon as the physical link is
1023          * established. To be able to handle these ATT messages, the user-
1024          * space first establishes the connection and then starts the pairing
1025          * process.
1026          *
1027          * So if a hci_conn object already exists for the following connection
1028          * attempt, we simply update pending_sec_level and auth_type fields
1029          * and return the object found.
1030          */
1031         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1032         if (conn) {
1033                 if (conn->pending_sec_level < sec_level)
1034                         conn->pending_sec_level = sec_level;
1035                 goto done;
1036         }
1037
1038         BT_DBG("requesting refresh of dst_addr");
1039
1040         conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1041         if (!conn)
1042                 return ERR_PTR(-ENOMEM);
1043
1044         if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0)
1045                 return ERR_PTR(-EBUSY);
1046
1047         conn->state = BT_CONNECT;
1048         set_bit(HCI_CONN_SCANNING, &conn->flags);
1049         conn->dst_type = dst_type;
1050         conn->sec_level = BT_SECURITY_LOW;
1051         conn->pending_sec_level = sec_level;
1052         conn->conn_timeout = conn_timeout;
1053
1054         hci_update_background_scan(hdev);
1055
1056 done:
1057         hci_conn_hold(conn);
1058         return conn;
1059 }
1060
1061 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1062                                  u8 sec_level, u8 auth_type)
1063 {
1064         struct hci_conn *acl;
1065
1066         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1067                 if (lmp_bredr_capable(hdev))
1068                         return ERR_PTR(-ECONNREFUSED);
1069
1070                 return ERR_PTR(-EOPNOTSUPP);
1071         }
1072
1073         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1074         if (!acl) {
1075                 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1076                 if (!acl)
1077                         return ERR_PTR(-ENOMEM);
1078         }
1079
1080         hci_conn_hold(acl);
1081
1082         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1083                 acl->sec_level = BT_SECURITY_LOW;
1084                 acl->pending_sec_level = sec_level;
1085                 acl->auth_type = auth_type;
1086                 hci_acl_create_connection(acl);
1087         }
1088
1089         return acl;
1090 }
1091
1092 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1093                                  __u16 setting)
1094 {
1095         struct hci_conn *acl;
1096         struct hci_conn *sco;
1097
1098         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1099         if (IS_ERR(acl))
1100                 return acl;
1101
1102         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1103         if (!sco) {
1104                 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1105                 if (!sco) {
1106                         hci_conn_drop(acl);
1107                         return ERR_PTR(-ENOMEM);
1108                 }
1109         }
1110
1111         acl->link = sco;
1112         sco->link = acl;
1113
1114         hci_conn_hold(sco);
1115
1116         sco->setting = setting;
1117
1118         if (acl->state == BT_CONNECTED &&
1119             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1120                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1121                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1122
1123                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1124                         /* defer SCO setup until mode change completed */
1125                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1126                         return sco;
1127                 }
1128
1129                 hci_sco_setup(acl, 0x00);
1130         }
1131
1132         return sco;
1133 }
1134
1135 /* Check link security requirement */
1136 int hci_conn_check_link_mode(struct hci_conn *conn)
1137 {
1138         BT_DBG("hcon %p", conn);
1139
1140         /* In Secure Connections Only mode, it is required that Secure
1141          * Connections is used and the link is encrypted with AES-CCM
1142          * using a P-256 authenticated combination key.
1143          */
1144         if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1145                 if (!hci_conn_sc_enabled(conn) ||
1146                     !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1147                     conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1148                         return 0;
1149         }
1150
1151         if (hci_conn_ssp_enabled(conn) &&
1152             !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1153                 return 0;
1154
1155         return 1;
1156 }
1157
1158 /* Authenticate remote device */
1159 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1160 {
1161         BT_DBG("hcon %p", conn);
1162
1163         if (conn->pending_sec_level > sec_level)
1164                 sec_level = conn->pending_sec_level;
1165
1166         if (sec_level > conn->sec_level)
1167                 conn->pending_sec_level = sec_level;
1168         else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1169                 return 1;
1170
1171         /* Make sure we preserve an existing MITM requirement*/
1172         auth_type |= (conn->auth_type & 0x01);
1173
1174         conn->auth_type = auth_type;
1175
1176         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1177                 struct hci_cp_auth_requested cp;
1178
1179                 cp.handle = cpu_to_le16(conn->handle);
1180                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1181                              sizeof(cp), &cp);
1182
1183                 /* If we're already encrypted set the REAUTH_PEND flag,
1184                  * otherwise set the ENCRYPT_PEND.
1185                  */
1186                 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1187                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1188                 else
1189                         set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1190         }
1191
1192         return 0;
1193 }
1194
1195 /* Encrypt the the link */
1196 static void hci_conn_encrypt(struct hci_conn *conn)
1197 {
1198         BT_DBG("hcon %p", conn);
1199
1200         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1201                 struct hci_cp_set_conn_encrypt cp;
1202                 cp.handle  = cpu_to_le16(conn->handle);
1203                 cp.encrypt = 0x01;
1204                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1205                              &cp);
1206         }
1207 }
1208
1209 /* Enable security */
1210 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1211                       bool initiator)
1212 {
1213         BT_DBG("hcon %p", conn);
1214
1215         if (conn->type == LE_LINK)
1216                 return smp_conn_security(conn, sec_level);
1217
1218         /* For sdp we don't need the link key. */
1219         if (sec_level == BT_SECURITY_SDP)
1220                 return 1;
1221
1222         /* For non 2.1 devices and low security level we don't need the link
1223            key. */
1224         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1225                 return 1;
1226
1227         /* For other security levels we need the link key. */
1228         if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1229                 goto auth;
1230
1231         /* An authenticated FIPS approved combination key has sufficient
1232          * security for security level 4. */
1233         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1234             sec_level == BT_SECURITY_FIPS)
1235                 goto encrypt;
1236
1237         /* An authenticated combination key has sufficient security for
1238            security level 3. */
1239         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1240              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1241             sec_level == BT_SECURITY_HIGH)
1242                 goto encrypt;
1243
1244         /* An unauthenticated combination key has sufficient security for
1245            security level 1 and 2. */
1246         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1247              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1248             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1249                 goto encrypt;
1250
1251         /* A combination key has always sufficient security for the security
1252            levels 1 or 2. High security level requires the combination key
1253            is generated using maximum PIN code length (16).
1254            For pre 2.1 units. */
1255         if (conn->key_type == HCI_LK_COMBINATION &&
1256             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1257              conn->pin_length == 16))
1258                 goto encrypt;
1259
1260 auth:
1261         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1262                 return 0;
1263
1264         if (initiator)
1265                 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1266
1267         if (!hci_conn_auth(conn, sec_level, auth_type))
1268                 return 0;
1269
1270 encrypt:
1271         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1272                 return 1;
1273
1274         hci_conn_encrypt(conn);
1275         return 0;
1276 }
1277 EXPORT_SYMBOL(hci_conn_security);
1278
1279 /* Check secure link requirement */
1280 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1281 {
1282         BT_DBG("hcon %p", conn);
1283
1284         /* Accept if non-secure or higher security level is required */
1285         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1286                 return 1;
1287
1288         /* Accept if secure or higher security level is already present */
1289         if (conn->sec_level == BT_SECURITY_HIGH ||
1290             conn->sec_level == BT_SECURITY_FIPS)
1291                 return 1;
1292
1293         /* Reject not secure link */
1294         return 0;
1295 }
1296 EXPORT_SYMBOL(hci_conn_check_secure);
1297
1298 /* Switch role */
1299 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1300 {
1301         BT_DBG("hcon %p", conn);
1302
1303         if (role == conn->role)
1304                 return 1;
1305
1306         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1307                 struct hci_cp_switch_role cp;
1308                 bacpy(&cp.bdaddr, &conn->dst);
1309                 cp.role = role;
1310                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1311         }
1312
1313         return 0;
1314 }
1315 EXPORT_SYMBOL(hci_conn_switch_role);
1316
1317 /* Enter active mode */
1318 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1319 {
1320         struct hci_dev *hdev = conn->hdev;
1321
1322         BT_DBG("hcon %p mode %d", conn, conn->mode);
1323
1324         if (conn->mode != HCI_CM_SNIFF)
1325                 goto timer;
1326
1327         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1328                 goto timer;
1329
1330         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1331                 struct hci_cp_exit_sniff_mode cp;
1332                 cp.handle = cpu_to_le16(conn->handle);
1333                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1334         }
1335
1336 timer:
1337         if (hdev->idle_timeout > 0)
1338                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1339                                    msecs_to_jiffies(hdev->idle_timeout));
1340 }
1341
1342 /* Drop all connection on the device */
1343 void hci_conn_hash_flush(struct hci_dev *hdev)
1344 {
1345         struct hci_conn_hash *h = &hdev->conn_hash;
1346         struct hci_conn *c, *n;
1347
1348         BT_DBG("hdev %s", hdev->name);
1349
1350         list_for_each_entry_safe(c, n, &h->list, list) {
1351                 c->state = BT_CLOSED;
1352
1353                 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1354                 hci_conn_del(c);
1355         }
1356 }
1357
1358 /* Check pending connect attempts */
1359 void hci_conn_check_pending(struct hci_dev *hdev)
1360 {
1361         struct hci_conn *conn;
1362
1363         BT_DBG("hdev %s", hdev->name);
1364
1365         hci_dev_lock(hdev);
1366
1367         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1368         if (conn)
1369                 hci_acl_create_connection(conn);
1370
1371         hci_dev_unlock(hdev);
1372 }
1373
1374 static u32 get_link_mode(struct hci_conn *conn)
1375 {
1376         u32 link_mode = 0;
1377
1378         if (conn->role == HCI_ROLE_MASTER)
1379                 link_mode |= HCI_LM_MASTER;
1380
1381         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1382                 link_mode |= HCI_LM_ENCRYPT;
1383
1384         if (test_bit(HCI_CONN_AUTH, &conn->flags))
1385                 link_mode |= HCI_LM_AUTH;
1386
1387         if (test_bit(HCI_CONN_SECURE, &conn->flags))
1388                 link_mode |= HCI_LM_SECURE;
1389
1390         if (test_bit(HCI_CONN_FIPS, &conn->flags))
1391                 link_mode |= HCI_LM_FIPS;
1392
1393         return link_mode;
1394 }
1395
1396 int hci_get_conn_list(void __user *arg)
1397 {
1398         struct hci_conn *c;
1399         struct hci_conn_list_req req, *cl;
1400         struct hci_conn_info *ci;
1401         struct hci_dev *hdev;
1402         int n = 0, size, err;
1403
1404         if (copy_from_user(&req, arg, sizeof(req)))
1405                 return -EFAULT;
1406
1407         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1408                 return -EINVAL;
1409
1410         size = sizeof(req) + req.conn_num * sizeof(*ci);
1411
1412         cl = kmalloc(size, GFP_KERNEL);
1413         if (!cl)
1414                 return -ENOMEM;
1415
1416         hdev = hci_dev_get(req.dev_id);
1417         if (!hdev) {
1418                 kfree(cl);
1419                 return -ENODEV;
1420         }
1421
1422         ci = cl->conn_info;
1423
1424         hci_dev_lock(hdev);
1425         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1426                 bacpy(&(ci + n)->bdaddr, &c->dst);
1427                 (ci + n)->handle = c->handle;
1428                 (ci + n)->type  = c->type;
1429                 (ci + n)->out   = c->out;
1430                 (ci + n)->state = c->state;
1431                 (ci + n)->link_mode = get_link_mode(c);
1432                 if (++n >= req.conn_num)
1433                         break;
1434         }
1435         hci_dev_unlock(hdev);
1436
1437         cl->dev_id = hdev->id;
1438         cl->conn_num = n;
1439         size = sizeof(req) + n * sizeof(*ci);
1440
1441         hci_dev_put(hdev);
1442
1443         err = copy_to_user(arg, cl, size);
1444         kfree(cl);
1445
1446         return err ? -EFAULT : 0;
1447 }
1448
1449 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1450 {
1451         struct hci_conn_info_req req;
1452         struct hci_conn_info ci;
1453         struct hci_conn *conn;
1454         char __user *ptr = arg + sizeof(req);
1455
1456         if (copy_from_user(&req, arg, sizeof(req)))
1457                 return -EFAULT;
1458
1459         hci_dev_lock(hdev);
1460         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1461         if (conn) {
1462                 bacpy(&ci.bdaddr, &conn->dst);
1463                 ci.handle = conn->handle;
1464                 ci.type  = conn->type;
1465                 ci.out   = conn->out;
1466                 ci.state = conn->state;
1467                 ci.link_mode = get_link_mode(conn);
1468         }
1469         hci_dev_unlock(hdev);
1470
1471         if (!conn)
1472                 return -ENOENT;
1473
1474         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1475 }
1476
1477 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1478 {
1479         struct hci_auth_info_req req;
1480         struct hci_conn *conn;
1481
1482         if (copy_from_user(&req, arg, sizeof(req)))
1483                 return -EFAULT;
1484
1485         hci_dev_lock(hdev);
1486         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1487         if (conn)
1488                 req.type = conn->auth_type;
1489         hci_dev_unlock(hdev);
1490
1491         if (!conn)
1492                 return -ENOENT;
1493
1494         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1495 }
1496
1497 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1498 {
1499         struct hci_dev *hdev = conn->hdev;
1500         struct hci_chan *chan;
1501
1502         BT_DBG("%s hcon %p", hdev->name, conn);
1503
1504         if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1505                 BT_DBG("Refusing to create new hci_chan");
1506                 return NULL;
1507         }
1508
1509         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1510         if (!chan)
1511                 return NULL;
1512
1513         chan->conn = hci_conn_get(conn);
1514         skb_queue_head_init(&chan->data_q);
1515         chan->state = BT_CONNECTED;
1516
1517         list_add_rcu(&chan->list, &conn->chan_list);
1518
1519         return chan;
1520 }
1521
1522 void hci_chan_del(struct hci_chan *chan)
1523 {
1524         struct hci_conn *conn = chan->conn;
1525         struct hci_dev *hdev = conn->hdev;
1526
1527         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1528
1529         list_del_rcu(&chan->list);
1530
1531         synchronize_rcu();
1532
1533         /* Prevent new hci_chan's to be created for this hci_conn */
1534         set_bit(HCI_CONN_DROP, &conn->flags);
1535
1536         hci_conn_put(conn);
1537
1538         skb_queue_purge(&chan->data_q);
1539         kfree(chan);
1540 }
1541
1542 void hci_chan_list_flush(struct hci_conn *conn)
1543 {
1544         struct hci_chan *chan, *n;
1545
1546         BT_DBG("hcon %p", conn);
1547
1548         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1549                 hci_chan_del(chan);
1550 }
1551
1552 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1553                                                  __u16 handle)
1554 {
1555         struct hci_chan *hchan;
1556
1557         list_for_each_entry(hchan, &hcon->chan_list, list) {
1558                 if (hchan->handle == handle)
1559                         return hchan;
1560         }
1561
1562         return NULL;
1563 }
1564
1565 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1566 {
1567         struct hci_conn_hash *h = &hdev->conn_hash;
1568         struct hci_conn *hcon;
1569         struct hci_chan *hchan = NULL;
1570
1571         rcu_read_lock();
1572
1573         list_for_each_entry_rcu(hcon, &h->list, list) {
1574                 hchan = __hci_chan_lookup_handle(hcon, handle);
1575                 if (hchan)
1576                         break;
1577         }
1578
1579         rcu_read_unlock();
1580
1581         return hchan;
1582 }