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_dev_err(hdev, "request failed to create LE connection: "
 733                    "status 0x%2.2x", 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 set_ext_conn_params(struct hci_conn *conn,
 752                                 struct hci_cp_le_ext_conn_param *p)
 753 {
 754         struct hci_dev *hdev = conn->hdev;
 755
 756         memset(p, 0, sizeof(*p));
 757
 758         /* Set window to be the same value as the interval to
 759          * enable continuous scanning.
 760          */
 761         p->scan_interval = cpu_to_le16(hdev->le_scan_interval);
 762         p->scan_window = p->scan_interval;
 763         p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 764         p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 765         p->conn_latency = cpu_to_le16(conn->le_conn_latency);
 766         p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 767         p->min_ce_len = cpu_to_le16(0x0000);
 768         p->max_ce_len = cpu_to_le16(0x0000);
 769 }
 770
 771 static void hci_req_add_le_create_conn(struct hci_request *req,
 772                                        struct hci_conn *conn,
 773                                        bdaddr_t *direct_rpa)
 774 {
 775         struct hci_dev *hdev = conn->hdev;
 776         u8 own_addr_type;
 777
 778         /* If direct address was provided we use it instead of current
 779          * address.
 780          */
 781         if (direct_rpa) {
 782                 if (bacmp(&req->hdev->random_addr, direct_rpa))
 783                         hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
 784                                                                 direct_rpa);
 785
 786                 /* direct address is always RPA */
 787                 own_addr_type = ADDR_LE_DEV_RANDOM;
 788         } else {
 789                 /* Update random address, but set require_privacy to false so
 790                  * that we never connect with an non-resolvable address.
 791                  */
 792                 if (hci_update_random_address(req, false, conn_use_rpa(conn),
 793                                               &own_addr_type))
 794                         return;
 795         }
 796
 797         if (use_ext_conn(hdev)) {
 798                 struct hci_cp_le_ext_create_conn *cp;
 799                 struct hci_cp_le_ext_conn_param *p;
 800                 u8 data[sizeof(*cp) + sizeof(*p) * 3];
 801                 u32 plen;
 802
 803                 cp = (void *) data;
 804                 p = (void *) cp->data;
 805
 806                 memset(cp, 0, sizeof(*cp));
 807
 808                 bacpy(&cp->peer_addr, &conn->dst);
 809                 cp->peer_addr_type = conn->dst_type;
 810                 cp->own_addr_type = own_addr_type;
 811
 812                 plen = sizeof(*cp);
 813
 814                 if (scan_1m(hdev)) {
 815                         cp->phys |= LE_SCAN_PHY_1M;
 816                         set_ext_conn_params(conn, p);
 817
 818                         p++;
 819                         plen += sizeof(*p);
 820                 }
 821
 822                 if (scan_2m(hdev)) {
 823                         cp->phys |= LE_SCAN_PHY_2M;
 824                         set_ext_conn_params(conn, p);
 825
 826                         p++;
 827                         plen += sizeof(*p);
 828                 }
 829
 830                 if (scan_coded(hdev)) {
 831                         cp->phys |= LE_SCAN_PHY_CODED;
 832                         set_ext_conn_params(conn, p);
 833
 834                         plen += sizeof(*p);
 835                 }
 836
 837                 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
 838
 839         } else {
 840                 struct hci_cp_le_create_conn cp;
 841
 842                 memset(&cp, 0, sizeof(cp));
 843
 844                 /* Set window to be the same value as the interval to enable
 845                  * continuous scanning.
 846                  */
 847                 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
 848                 cp.scan_window = cp.scan_interval;
 849
 850                 bacpy(&cp.peer_addr, &conn->dst);
 851                 cp.peer_addr_type = conn->dst_type;
 852                 cp.own_address_type = own_addr_type;
 853                 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 854                 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 855                 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
 856                 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 857                 cp.min_ce_len = cpu_to_le16(0x0000);
 858                 cp.max_ce_len = cpu_to_le16(0x0000);
 859
 860                 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 861         }
 862
 863         conn->state = BT_CONNECT;
 864         clear_bit(HCI_CONN_SCANNING, &conn->flags);
 865 }
 866
 867 static void hci_req_directed_advertising(struct hci_request *req,
 868                                          struct hci_conn *conn)
 869 {
 870         struct hci_dev *hdev = req->hdev;
 871         u8 own_addr_type;
 872         u8 enable;
 873
 874         if (ext_adv_capable(hdev)) {
 875                 struct hci_cp_le_set_ext_adv_params cp;
 876                 bdaddr_t random_addr;
 877
 878                 /* Set require_privacy to false so that the remote device has a
 879                  * chance of identifying us.
 880                  */
 881                 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
 882                                            &own_addr_type, &random_addr) < 0)
 883                         return;
 884
 885                 memset(&cp, 0, sizeof(cp));
 886
 887                 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
 888                 cp.own_addr_type = own_addr_type;
 889                 cp.channel_map = hdev->le_adv_channel_map;
 890                 cp.tx_power = HCI_TX_POWER_INVALID;
 891                 cp.primary_phy = HCI_ADV_PHY_1M;
 892                 cp.secondary_phy = HCI_ADV_PHY_1M;
 893                 cp.handle = 0; /* Use instance 0 for directed adv */
 894                 cp.own_addr_type = own_addr_type;
 895                 cp.peer_addr_type = conn->dst_type;
 896                 bacpy(&cp.peer_addr, &conn->dst);
 897
 898                 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
 899
 900                 if (own_addr_type == ADDR_LE_DEV_RANDOM &&
 901                     bacmp(&random_addr, BDADDR_ANY) &&
 902                     bacmp(&random_addr, &hdev->random_addr)) {
 903                         struct hci_cp_le_set_adv_set_rand_addr cp;
 904
 905                         memset(&cp, 0, sizeof(cp));
 906
 907                         cp.handle = 0;
 908                         bacpy(&cp.bdaddr, &random_addr);
 909
 910                         hci_req_add(req,
 911                                     HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
 912                                     sizeof(cp), &cp);
 913                 }
 914
 915                 __hci_req_enable_ext_advertising(req);
 916         } else {
 917                 struct hci_cp_le_set_adv_param cp;
 918
 919                 /* Clear the HCI_LE_ADV bit temporarily so that the
 920                  * hci_update_random_address knows that it's safe to go ahead
 921                  * and write a new random address. The flag will be set back on
 922                  * as soon as the SET_ADV_ENABLE HCI command completes.
 923                  */
 924                 hci_dev_clear_flag(hdev, HCI_LE_ADV);
 925
 926                 /* Set require_privacy to false so that the remote device has a
 927                  * chance of identifying us.
 928                  */
 929                 if (hci_update_random_address(req, false, conn_use_rpa(conn),
 930                                               &own_addr_type) < 0)
 931                         return;
 932
 933                 memset(&cp, 0, sizeof(cp));
 934                 cp.type = LE_ADV_DIRECT_IND;
 935                 cp.own_address_type = own_addr_type;
 936                 cp.direct_addr_type = conn->dst_type;
 937                 bacpy(&cp.direct_addr, &conn->dst);
 938                 cp.channel_map = hdev->le_adv_channel_map;
 939
 940                 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
 941
 942                 enable = 0x01;
 943                 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 944                             &enable);
 945         }
 946
 947         conn->state = BT_CONNECT;
 948 }
 949
 950 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 951                                 u8 dst_type, u8 sec_level, u16 conn_timeout,
 952                                 u8 role, bdaddr_t *direct_rpa)
 953 {
 954         struct hci_conn_params *params;
 955         struct hci_conn *conn;
 956         struct smp_irk *irk;
 957         struct hci_request req;
 958         int err;
 959
 960         /* Let's make sure that le is enabled.*/
 961         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
 962                 if (lmp_le_capable(hdev))
 963                         return ERR_PTR(-ECONNREFUSED);
 964
 965                 return ERR_PTR(-EOPNOTSUPP);
 966         }
 967
 968         /* Since the controller supports only one LE connection attempt at a
 969          * time, we return -EBUSY if there is any connection attempt running.
 970          */
 971         if (hci_lookup_le_connect(hdev))
 972                 return ERR_PTR(-EBUSY);
 973
 974         /* If there's already a connection object but it's not in
 975          * scanning state it means it must already be established, in
 976          * which case we can't do anything else except report a failure
 977          * to connect.
 978          */
 979         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
 980         if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 981                 return ERR_PTR(-EBUSY);
 982         }
 983
 984         /* When given an identity address with existing identity
 985          * resolving key, the connection needs to be established
 986          * to a resolvable random address.
 987          *
 988          * Storing the resolvable random address is required here
 989          * to handle connection failures. The address will later
 990          * be resolved back into the original identity address
 991          * from the connect request.
 992          */
 993         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
 994         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
 995                 dst = &irk->rpa;
 996                 dst_type = ADDR_LE_DEV_RANDOM;
 997         }
 998
 999         if (conn) {
1000                 bacpy(&conn->dst, dst);
1001         } else {
1002                 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1003                 if (!conn)
1004                         return ERR_PTR(-ENOMEM);
1005                 hci_conn_hold(conn);
1006                 conn->pending_sec_level = sec_level;
1007         }
1008
1009         conn->dst_type = dst_type;
1010         conn->sec_level = BT_SECURITY_LOW;
1011         conn->conn_timeout = conn_timeout;
1012
1013         hci_req_init(&req, hdev);
1014
1015         /* Disable advertising if we're active. For master role
1016          * connections most controllers will refuse to connect if
1017          * advertising is enabled, and for slave role connections we
1018          * anyway have to disable it in order to start directed
1019          * advertising.
1020          */
1021         if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
1022                 u8 enable = 0x00;
1023                 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1024                             &enable);
1025         }
1026
1027         /* If requested to connect as slave use directed advertising */
1028         if (conn->role == HCI_ROLE_SLAVE) {
1029                 /* If we're active scanning most controllers are unable
1030                  * to initiate advertising. Simply reject the attempt.
1031                  */
1032                 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1033                     hdev->le_scan_type == LE_SCAN_ACTIVE) {
1034                         hci_req_purge(&req);
1035                         hci_conn_del(conn);
1036                         return ERR_PTR(-EBUSY);
1037                 }
1038
1039                 hci_req_directed_advertising(&req, conn);
1040                 goto create_conn;
1041         }
1042
1043         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1044         if (params) {
1045                 conn->le_conn_min_interval = params->conn_min_interval;
1046                 conn->le_conn_max_interval = params->conn_max_interval;
1047                 conn->le_conn_latency = params->conn_latency;
1048                 conn->le_supv_timeout = params->supervision_timeout;
1049         } else {
1050                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1051                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1052                 conn->le_conn_latency = hdev->le_conn_latency;
1053                 conn->le_supv_timeout = hdev->le_supv_timeout;
1054         }
1055
1056         /* If controller is scanning, we stop it since some controllers are
1057          * not able to scan and connect at the same time. Also set the
1058          * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1059          * handler for scan disabling knows to set the correct discovery
1060          * state.
1061          */
1062         if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1063                 hci_req_add_le_scan_disable(&req);
1064                 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1065         }
1066
1067         hci_req_add_le_create_conn(&req, conn, direct_rpa);
1068
1069 create_conn:
1070         err = hci_req_run(&req, create_le_conn_complete);
1071         if (err) {
1072                 hci_conn_del(conn);
1073                 return ERR_PTR(err);
1074         }
1075
1076         return conn;
1077 }
1078
1079 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1080 {
1081         struct hci_conn *conn;
1082
1083         conn = hci_conn_hash_lookup_le(hdev, addr, type);
1084         if (!conn)
1085                 return false;
1086
1087         if (conn->state != BT_CONNECTED)
1088                 return false;
1089
1090         return true;
1091 }
1092
1093 /* This function requires the caller holds hdev->lock */
1094 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1095                                         bdaddr_t *addr, u8 addr_type)
1096 {
1097         struct hci_conn_params *params;
1098
1099         if (is_connected(hdev, addr, addr_type))
1100                 return -EISCONN;
1101
1102         params = hci_conn_params_lookup(hdev, addr, addr_type);
1103         if (!params) {
1104                 params = hci_conn_params_add(hdev, addr, addr_type);
1105                 if (!params)
1106                         return -ENOMEM;
1107
1108                 /* If we created new params, mark them to be deleted in
1109                  * hci_connect_le_scan_cleanup. It's different case than
1110                  * existing disabled params, those will stay after cleanup.
1111                  */
1112                 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1113         }
1114
1115         /* We're trying to connect, so make sure params are at pend_le_conns */
1116         if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1117             params->auto_connect == HCI_AUTO_CONN_REPORT ||
1118             params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1119                 list_del_init(&params->action);
1120                 list_add(&params->action, &hdev->pend_le_conns);
1121         }
1122
1123         params->explicit_connect = true;
1124
1125         BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1126                params->auto_connect);
1127
1128         return 0;
1129 }
1130
1131 /* This function requires the caller holds hdev->lock */
1132 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1133                                      u8 dst_type, u8 sec_level,
1134                                      u16 conn_timeout)
1135 {
1136         struct hci_conn *conn;
1137
1138         /* Let's make sure that le is enabled.*/
1139         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1140                 if (lmp_le_capable(hdev))
1141                         return ERR_PTR(-ECONNREFUSED);
1142
1143                 return ERR_PTR(-EOPNOTSUPP);
1144         }
1145
1146         /* Some devices send ATT messages as soon as the physical link is
1147          * established. To be able to handle these ATT messages, the user-
1148          * space first establishes the connection and then starts the pairing
1149          * process.
1150          *
1151          * So if a hci_conn object already exists for the following connection
1152          * attempt, we simply update pending_sec_level and auth_type fields
1153          * and return the object found.
1154          */
1155         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1156         if (conn) {
1157                 if (conn->pending_sec_level < sec_level)
1158                         conn->pending_sec_level = sec_level;
1159                 goto done;
1160         }
1161
1162         BT_DBG("requesting refresh of dst_addr");
1163
1164         conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1165         if (!conn)
1166                 return ERR_PTR(-ENOMEM);
1167
1168         if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0)
1169                 return ERR_PTR(-EBUSY);
1170
1171         conn->state = BT_CONNECT;
1172         set_bit(HCI_CONN_SCANNING, &conn->flags);
1173         conn->dst_type = dst_type;
1174         conn->sec_level = BT_SECURITY_LOW;
1175         conn->pending_sec_level = sec_level;
1176         conn->conn_timeout = conn_timeout;
1177
1178         hci_update_background_scan(hdev);
1179
1180 done:
1181         hci_conn_hold(conn);
1182         return conn;
1183 }
1184
1185 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1186                                  u8 sec_level, u8 auth_type)
1187 {
1188         struct hci_conn *acl;
1189
1190         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1191                 if (lmp_bredr_capable(hdev))
1192                         return ERR_PTR(-ECONNREFUSED);
1193
1194                 return ERR_PTR(-EOPNOTSUPP);
1195         }
1196
1197         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1198         if (!acl) {
1199                 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1200                 if (!acl)
1201                         return ERR_PTR(-ENOMEM);
1202         }
1203
1204         hci_conn_hold(acl);
1205
1206         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1207                 acl->sec_level = BT_SECURITY_LOW;
1208                 acl->pending_sec_level = sec_level;
1209                 acl->auth_type = auth_type;
1210                 hci_acl_create_connection(acl);
1211         }
1212
1213         return acl;
1214 }
1215
1216 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1217                                  __u16 setting)
1218 {
1219         struct hci_conn *acl;
1220         struct hci_conn *sco;
1221
1222         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1223         if (IS_ERR(acl))
1224                 return acl;
1225
1226         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1227         if (!sco) {
1228                 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1229                 if (!sco) {
1230                         hci_conn_drop(acl);
1231                         return ERR_PTR(-ENOMEM);
1232                 }
1233         }
1234
1235         acl->link = sco;
1236         sco->link = acl;
1237
1238         hci_conn_hold(sco);
1239
1240         sco->setting = setting;
1241
1242         if (acl->state == BT_CONNECTED &&
1243             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1244                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1245                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1246
1247                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1248                         /* defer SCO setup until mode change completed */
1249                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1250                         return sco;
1251                 }
1252
1253                 hci_sco_setup(acl, 0x00);
1254         }
1255
1256         return sco;
1257 }
1258
1259 /* Check link security requirement */
1260 int hci_conn_check_link_mode(struct hci_conn *conn)
1261 {
1262         BT_DBG("hcon %p", conn);
1263
1264         /* In Secure Connections Only mode, it is required that Secure
1265          * Connections is used and the link is encrypted with AES-CCM
1266          * using a P-256 authenticated combination key.
1267          */
1268         if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1269                 if (!hci_conn_sc_enabled(conn) ||
1270                     !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1271                     conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1272                         return 0;
1273         }
1274
1275         if (hci_conn_ssp_enabled(conn) &&
1276             !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1277                 return 0;
1278
1279         return 1;
1280 }
1281
1282 /* Authenticate remote device */
1283 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1284 {
1285         BT_DBG("hcon %p", conn);
1286
1287         if (conn->pending_sec_level > sec_level)
1288                 sec_level = conn->pending_sec_level;
1289
1290         if (sec_level > conn->sec_level)
1291                 conn->pending_sec_level = sec_level;
1292         else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1293                 return 1;
1294
1295         /* Make sure we preserve an existing MITM requirement*/
1296         auth_type |= (conn->auth_type & 0x01);
1297
1298         conn->auth_type = auth_type;
1299
1300         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1301                 struct hci_cp_auth_requested cp;
1302
1303                 cp.handle = cpu_to_le16(conn->handle);
1304                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1305                              sizeof(cp), &cp);
1306
1307                 /* If we're already encrypted set the REAUTH_PEND flag,
1308                  * otherwise set the ENCRYPT_PEND.
1309                  */
1310                 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1311                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1312                 else
1313                         set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1314         }
1315
1316         return 0;
1317 }
1318
1319 /* Encrypt the the link */
1320 static void hci_conn_encrypt(struct hci_conn *conn)
1321 {
1322         BT_DBG("hcon %p", conn);
1323
1324         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1325                 struct hci_cp_set_conn_encrypt cp;
1326                 cp.handle  = cpu_to_le16(conn->handle);
1327                 cp.encrypt = 0x01;
1328                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1329                              &cp);
1330         }
1331 }
1332
1333 /* Enable security */
1334 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1335                       bool initiator)
1336 {
1337         BT_DBG("hcon %p", conn);
1338
1339         if (conn->type == LE_LINK)
1340                 return smp_conn_security(conn, sec_level);
1341
1342         /* For sdp we don't need the link key. */
1343         if (sec_level == BT_SECURITY_SDP)
1344                 return 1;
1345
1346         /* For non 2.1 devices and low security level we don't need the link
1347            key. */
1348         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1349                 return 1;
1350
1351         /* For other security levels we need the link key. */
1352         if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1353                 goto auth;
1354
1355         /* An authenticated FIPS approved combination key has sufficient
1356          * security for security level 4. */
1357         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1358             sec_level == BT_SECURITY_FIPS)
1359                 goto encrypt;
1360
1361         /* An authenticated combination key has sufficient security for
1362            security level 3. */
1363         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1364              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1365             sec_level == BT_SECURITY_HIGH)
1366                 goto encrypt;
1367
1368         /* An unauthenticated combination key has sufficient security for
1369            security level 1 and 2. */
1370         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1371              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1372             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1373                 goto encrypt;
1374
1375         /* A combination key has always sufficient security for the security
1376            levels 1 or 2. High security level requires the combination key
1377            is generated using maximum PIN code length (16).
1378            For pre 2.1 units. */
1379         if (conn->key_type == HCI_LK_COMBINATION &&
1380             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1381              conn->pin_length == 16))
1382                 goto encrypt;
1383
1384 auth:
1385         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1386                 return 0;
1387
1388         if (initiator)
1389                 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1390
1391         if (!hci_conn_auth(conn, sec_level, auth_type))
1392                 return 0;
1393
1394 encrypt:
1395         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1396                 return 1;
1397
1398         hci_conn_encrypt(conn);
1399         return 0;
1400 }
1401 EXPORT_SYMBOL(hci_conn_security);
1402
1403 /* Check secure link requirement */
1404 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1405 {
1406         BT_DBG("hcon %p", conn);
1407
1408         /* Accept if non-secure or higher security level is required */
1409         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1410                 return 1;
1411
1412         /* Accept if secure or higher security level is already present */
1413         if (conn->sec_level == BT_SECURITY_HIGH ||
1414             conn->sec_level == BT_SECURITY_FIPS)
1415                 return 1;
1416
1417         /* Reject not secure link */
1418         return 0;
1419 }
1420 EXPORT_SYMBOL(hci_conn_check_secure);
1421
1422 /* Switch role */
1423 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1424 {
1425         BT_DBG("hcon %p", conn);
1426
1427         if (role == conn->role)
1428                 return 1;
1429
1430         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1431                 struct hci_cp_switch_role cp;
1432                 bacpy(&cp.bdaddr, &conn->dst);
1433                 cp.role = role;
1434                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1435         }
1436
1437         return 0;
1438 }
1439 EXPORT_SYMBOL(hci_conn_switch_role);
1440
1441 /* Enter active mode */
1442 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1443 {
1444         struct hci_dev *hdev = conn->hdev;
1445
1446         BT_DBG("hcon %p mode %d", conn, conn->mode);
1447
1448         if (conn->mode != HCI_CM_SNIFF)
1449                 goto timer;
1450
1451         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1452                 goto timer;
1453
1454         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1455                 struct hci_cp_exit_sniff_mode cp;
1456                 cp.handle = cpu_to_le16(conn->handle);
1457                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1458         }
1459
1460 timer:
1461         if (hdev->idle_timeout > 0)
1462                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1463                                    msecs_to_jiffies(hdev->idle_timeout));
1464 }
1465
1466 /* Drop all connection on the device */
1467 void hci_conn_hash_flush(struct hci_dev *hdev)
1468 {
1469         struct hci_conn_hash *h = &hdev->conn_hash;
1470         struct hci_conn *c, *n;
1471
1472         BT_DBG("hdev %s", hdev->name);
1473
1474         list_for_each_entry_safe(c, n, &h->list, list) {
1475                 c->state = BT_CLOSED;
1476
1477                 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1478                 hci_conn_del(c);
1479         }
1480 }
1481
1482 /* Check pending connect attempts */
1483 void hci_conn_check_pending(struct hci_dev *hdev)
1484 {
1485         struct hci_conn *conn;
1486
1487         BT_DBG("hdev %s", hdev->name);
1488
1489         hci_dev_lock(hdev);
1490
1491         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1492         if (conn)
1493                 hci_acl_create_connection(conn);
1494
1495         hci_dev_unlock(hdev);
1496 }
1497
1498 static u32 get_link_mode(struct hci_conn *conn)
1499 {
1500         u32 link_mode = 0;
1501
1502         if (conn->role == HCI_ROLE_MASTER)
1503                 link_mode |= HCI_LM_MASTER;
1504
1505         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1506                 link_mode |= HCI_LM_ENCRYPT;
1507
1508         if (test_bit(HCI_CONN_AUTH, &conn->flags))
1509                 link_mode |= HCI_LM_AUTH;
1510
1511         if (test_bit(HCI_CONN_SECURE, &conn->flags))
1512                 link_mode |= HCI_LM_SECURE;
1513
1514         if (test_bit(HCI_CONN_FIPS, &conn->flags))
1515                 link_mode |= HCI_LM_FIPS;
1516
1517         return link_mode;
1518 }
1519
1520 int hci_get_conn_list(void __user *arg)
1521 {
1522         struct hci_conn *c;
1523         struct hci_conn_list_req req, *cl;
1524         struct hci_conn_info *ci;
1525         struct hci_dev *hdev;
1526         int n = 0, size, err;
1527
1528         if (copy_from_user(&req, arg, sizeof(req)))
1529                 return -EFAULT;
1530
1531         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1532                 return -EINVAL;
1533
1534         size = sizeof(req) + req.conn_num * sizeof(*ci);
1535
1536         cl = kmalloc(size, GFP_KERNEL);
1537         if (!cl)
1538                 return -ENOMEM;
1539
1540         hdev = hci_dev_get(req.dev_id);
1541         if (!hdev) {
1542                 kfree(cl);
1543                 return -ENODEV;
1544         }
1545
1546         ci = cl->conn_info;
1547
1548         hci_dev_lock(hdev);
1549         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1550                 bacpy(&(ci + n)->bdaddr, &c->dst);
1551                 (ci + n)->handle = c->handle;
1552                 (ci + n)->type  = c->type;
1553                 (ci + n)->out   = c->out;
1554                 (ci + n)->state = c->state;
1555                 (ci + n)->link_mode = get_link_mode(c);
1556                 if (++n >= req.conn_num)
1557                         break;
1558         }
1559         hci_dev_unlock(hdev);
1560
1561         cl->dev_id = hdev->id;
1562         cl->conn_num = n;
1563         size = sizeof(req) + n * sizeof(*ci);
1564
1565         hci_dev_put(hdev);
1566
1567         err = copy_to_user(arg, cl, size);
1568         kfree(cl);
1569
1570         return err ? -EFAULT : 0;
1571 }
1572
1573 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1574 {
1575         struct hci_conn_info_req req;
1576         struct hci_conn_info ci;
1577         struct hci_conn *conn;
1578         char __user *ptr = arg + sizeof(req);
1579
1580         if (copy_from_user(&req, arg, sizeof(req)))
1581                 return -EFAULT;
1582
1583         hci_dev_lock(hdev);
1584         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1585         if (conn) {
1586                 bacpy(&ci.bdaddr, &conn->dst);
1587                 ci.handle = conn->handle;
1588                 ci.type  = conn->type;
1589                 ci.out   = conn->out;
1590                 ci.state = conn->state;
1591                 ci.link_mode = get_link_mode(conn);
1592         }
1593         hci_dev_unlock(hdev);
1594
1595         if (!conn)
1596                 return -ENOENT;
1597
1598         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1599 }
1600
1601 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1602 {
1603         struct hci_auth_info_req req;
1604         struct hci_conn *conn;
1605
1606         if (copy_from_user(&req, arg, sizeof(req)))
1607                 return -EFAULT;
1608
1609         hci_dev_lock(hdev);
1610         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1611         if (conn)
1612                 req.type = conn->auth_type;
1613         hci_dev_unlock(hdev);
1614
1615         if (!conn)
1616                 return -ENOENT;
1617
1618         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1619 }
1620
1621 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1622 {
1623         struct hci_dev *hdev = conn->hdev;
1624         struct hci_chan *chan;
1625
1626         BT_DBG("%s hcon %p", hdev->name, conn);
1627
1628         if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1629                 BT_DBG("Refusing to create new hci_chan");
1630                 return NULL;
1631         }
1632
1633         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1634         if (!chan)
1635                 return NULL;
1636
1637         chan->conn = hci_conn_get(conn);
1638         skb_queue_head_init(&chan->data_q);
1639         chan->state = BT_CONNECTED;
1640
1641         list_add_rcu(&chan->list, &conn->chan_list);
1642
1643         return chan;
1644 }
1645
1646 void hci_chan_del(struct hci_chan *chan)
1647 {
1648         struct hci_conn *conn = chan->conn;
1649         struct hci_dev *hdev = conn->hdev;
1650
1651         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1652
1653         list_del_rcu(&chan->list);
1654
1655         synchronize_rcu();
1656
1657         /* Prevent new hci_chan's to be created for this hci_conn */
1658         set_bit(HCI_CONN_DROP, &conn->flags);
1659
1660         hci_conn_put(conn);
1661
1662         skb_queue_purge(&chan->data_q);
1663         kfree(chan);
1664 }
1665
1666 void hci_chan_list_flush(struct hci_conn *conn)
1667 {
1668         struct hci_chan *chan, *n;
1669
1670         BT_DBG("hcon %p", conn);
1671
1672         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1673                 hci_chan_del(chan);
1674 }
1675
1676 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1677                                                  __u16 handle)
1678 {
1679         struct hci_chan *hchan;
1680
1681         list_for_each_entry(hchan, &hcon->chan_list, list) {
1682                 if (hchan->handle == handle)
1683                         return hchan;
1684         }
1685
1686         return NULL;
1687 }
1688
1689 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1690 {
1691         struct hci_conn_hash *h = &hdev->conn_hash;
1692         struct hci_conn *hcon;
1693         struct hci_chan *hchan = NULL;
1694
1695         rcu_read_lock();
1696
1697         list_for_each_entry_rcu(hcon, &h->list, list) {
1698                 hchan = __hci_chan_lookup_handle(hcon, handle);
1699                 if (hchan)
1700                         break;
1701         }
1702
1703         rcu_read_unlock();
1704
1705         return hchan;
1706 }