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
 935                 /* Some controllers might reject command if intervals are not
 936                  * within range for undirected advertising.
 937                  * BCM20702A0 is known to be affected by this.
 938                  */
 939                 cp.min_interval = cpu_to_le16(0x0020);
 940                 cp.max_interval = cpu_to_le16(0x0020);
 941
 942                 cp.type = LE_ADV_DIRECT_IND;
 943                 cp.own_address_type = own_addr_type;
 944                 cp.direct_addr_type = conn->dst_type;
 945                 bacpy(&cp.direct_addr, &conn->dst);
 946                 cp.channel_map = hdev->le_adv_channel_map;
 947
 948                 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
 949
 950                 enable = 0x01;
 951                 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 952                             &enable);
 953         }
 954
 955         conn->state = BT_CONNECT;
 956 }
 957
 958 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 959                                 u8 dst_type, u8 sec_level, u16 conn_timeout,
 960                                 u8 role, bdaddr_t *direct_rpa)
 961 {
 962         struct hci_conn_params *params;
 963         struct hci_conn *conn;
 964         struct smp_irk *irk;
 965         struct hci_request req;
 966         int err;
 967
 968         /* Let's make sure that le is enabled.*/
 969         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
 970                 if (lmp_le_capable(hdev))
 971                         return ERR_PTR(-ECONNREFUSED);
 972
 973                 return ERR_PTR(-EOPNOTSUPP);
 974         }
 975
 976         /* Since the controller supports only one LE connection attempt at a
 977          * time, we return -EBUSY if there is any connection attempt running.
 978          */
 979         if (hci_lookup_le_connect(hdev))
 980                 return ERR_PTR(-EBUSY);
 981
 982         /* If there's already a connection object but it's not in
 983          * scanning state it means it must already be established, in
 984          * which case we can't do anything else except report a failure
 985          * to connect.
 986          */
 987         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
 988         if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 989                 return ERR_PTR(-EBUSY);
 990         }
 991
 992         /* When given an identity address with existing identity
 993          * resolving key, the connection needs to be established
 994          * to a resolvable random address.
 995          *
 996          * Storing the resolvable random address is required here
 997          * to handle connection failures. The address will later
 998          * be resolved back into the original identity address
 999          * from the connect request.
1000          */
1001         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1002         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1003                 dst = &irk->rpa;
1004                 dst_type = ADDR_LE_DEV_RANDOM;
1005         }
1006
1007         if (conn) {
1008                 bacpy(&conn->dst, dst);
1009         } else {
1010                 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1011                 if (!conn)
1012                         return ERR_PTR(-ENOMEM);
1013                 hci_conn_hold(conn);
1014                 conn->pending_sec_level = sec_level;
1015         }
1016
1017         conn->dst_type = dst_type;
1018         conn->sec_level = BT_SECURITY_LOW;
1019         conn->conn_timeout = conn_timeout;
1020
1021         hci_req_init(&req, hdev);
1022
1023         /* Disable advertising if we're active. For master role
1024          * connections most controllers will refuse to connect if
1025          * advertising is enabled, and for slave role connections we
1026          * anyway have to disable it in order to start directed
1027          * advertising.
1028          */
1029         if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
1030                 u8 enable = 0x00;
1031                 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1032                             &enable);
1033         }
1034
1035         /* If requested to connect as slave use directed advertising */
1036         if (conn->role == HCI_ROLE_SLAVE) {
1037                 /* If we're active scanning most controllers are unable
1038                  * to initiate advertising. Simply reject the attempt.
1039                  */
1040                 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1041                     hdev->le_scan_type == LE_SCAN_ACTIVE) {
1042                         hci_req_purge(&req);
1043                         hci_conn_del(conn);
1044                         return ERR_PTR(-EBUSY);
1045                 }
1046
1047                 hci_req_directed_advertising(&req, conn);
1048                 goto create_conn;
1049         }
1050
1051         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1052         if (params) {
1053                 conn->le_conn_min_interval = params->conn_min_interval;
1054                 conn->le_conn_max_interval = params->conn_max_interval;
1055                 conn->le_conn_latency = params->conn_latency;
1056                 conn->le_supv_timeout = params->supervision_timeout;
1057         } else {
1058                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1059                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1060                 conn->le_conn_latency = hdev->le_conn_latency;
1061                 conn->le_supv_timeout = hdev->le_supv_timeout;
1062         }
1063
1064         /* If controller is scanning, we stop it since some controllers are
1065          * not able to scan and connect at the same time. Also set the
1066          * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1067          * handler for scan disabling knows to set the correct discovery
1068          * state.
1069          */
1070         if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1071                 hci_req_add_le_scan_disable(&req);
1072                 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1073         }
1074
1075         hci_req_add_le_create_conn(&req, conn, direct_rpa);
1076
1077 create_conn:
1078         err = hci_req_run(&req, create_le_conn_complete);
1079         if (err) {
1080                 hci_conn_del(conn);
1081                 return ERR_PTR(err);
1082         }
1083
1084         return conn;
1085 }
1086
1087 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1088 {
1089         struct hci_conn *conn;
1090
1091         conn = hci_conn_hash_lookup_le(hdev, addr, type);
1092         if (!conn)
1093                 return false;
1094
1095         if (conn->state != BT_CONNECTED)
1096                 return false;
1097
1098         return true;
1099 }
1100
1101 /* This function requires the caller holds hdev->lock */
1102 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1103                                         bdaddr_t *addr, u8 addr_type)
1104 {
1105         struct hci_conn_params *params;
1106
1107         if (is_connected(hdev, addr, addr_type))
1108                 return -EISCONN;
1109
1110         params = hci_conn_params_lookup(hdev, addr, addr_type);
1111         if (!params) {
1112                 params = hci_conn_params_add(hdev, addr, addr_type);
1113                 if (!params)
1114                         return -ENOMEM;
1115
1116                 /* If we created new params, mark them to be deleted in
1117                  * hci_connect_le_scan_cleanup. It's different case than
1118                  * existing disabled params, those will stay after cleanup.
1119                  */
1120                 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1121         }
1122
1123         /* We're trying to connect, so make sure params are at pend_le_conns */
1124         if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1125             params->auto_connect == HCI_AUTO_CONN_REPORT ||
1126             params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1127                 list_del_init(&params->action);
1128                 list_add(&params->action, &hdev->pend_le_conns);
1129         }
1130
1131         params->explicit_connect = true;
1132
1133         BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1134                params->auto_connect);
1135
1136         return 0;
1137 }
1138
1139 /* This function requires the caller holds hdev->lock */
1140 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1141                                      u8 dst_type, u8 sec_level,
1142                                      u16 conn_timeout)
1143 {
1144         struct hci_conn *conn;
1145
1146         /* Let's make sure that le is enabled.*/
1147         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1148                 if (lmp_le_capable(hdev))
1149                         return ERR_PTR(-ECONNREFUSED);
1150
1151                 return ERR_PTR(-EOPNOTSUPP);
1152         }
1153
1154         /* Some devices send ATT messages as soon as the physical link is
1155          * established. To be able to handle these ATT messages, the user-
1156          * space first establishes the connection and then starts the pairing
1157          * process.
1158          *
1159          * So if a hci_conn object already exists for the following connection
1160          * attempt, we simply update pending_sec_level and auth_type fields
1161          * and return the object found.
1162          */
1163         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1164         if (conn) {
1165                 if (conn->pending_sec_level < sec_level)
1166                         conn->pending_sec_level = sec_level;
1167                 goto done;
1168         }
1169
1170         BT_DBG("requesting refresh of dst_addr");
1171
1172         conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1173         if (!conn)
1174                 return ERR_PTR(-ENOMEM);
1175
1176         if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1177                 hci_conn_del(conn);
1178                 return ERR_PTR(-EBUSY);
1179         }
1180
1181         conn->state = BT_CONNECT;
1182         set_bit(HCI_CONN_SCANNING, &conn->flags);
1183         conn->dst_type = dst_type;
1184         conn->sec_level = BT_SECURITY_LOW;
1185         conn->pending_sec_level = sec_level;
1186         conn->conn_timeout = conn_timeout;
1187
1188         hci_update_background_scan(hdev);
1189
1190 done:
1191         hci_conn_hold(conn);
1192         return conn;
1193 }
1194
1195 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1196                                  u8 sec_level, u8 auth_type)
1197 {
1198         struct hci_conn *acl;
1199
1200         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1201                 if (lmp_bredr_capable(hdev))
1202                         return ERR_PTR(-ECONNREFUSED);
1203
1204                 return ERR_PTR(-EOPNOTSUPP);
1205         }
1206
1207         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1208         if (!acl) {
1209                 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1210                 if (!acl)
1211                         return ERR_PTR(-ENOMEM);
1212         }
1213
1214         hci_conn_hold(acl);
1215
1216         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1217                 acl->sec_level = BT_SECURITY_LOW;
1218                 acl->pending_sec_level = sec_level;
1219                 acl->auth_type = auth_type;
1220                 hci_acl_create_connection(acl);
1221         }
1222
1223         return acl;
1224 }
1225
1226 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1227                                  __u16 setting)
1228 {
1229         struct hci_conn *acl;
1230         struct hci_conn *sco;
1231
1232         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1233         if (IS_ERR(acl))
1234                 return acl;
1235
1236         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1237         if (!sco) {
1238                 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1239                 if (!sco) {
1240                         hci_conn_drop(acl);
1241                         return ERR_PTR(-ENOMEM);
1242                 }
1243         }
1244
1245         acl->link = sco;
1246         sco->link = acl;
1247
1248         hci_conn_hold(sco);
1249
1250         sco->setting = setting;
1251
1252         if (acl->state == BT_CONNECTED &&
1253             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1254                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1255                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1256
1257                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1258                         /* defer SCO setup until mode change completed */
1259                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1260                         return sco;
1261                 }
1262
1263                 hci_sco_setup(acl, 0x00);
1264         }
1265
1266         return sco;
1267 }
1268
1269 /* Check link security requirement */
1270 int hci_conn_check_link_mode(struct hci_conn *conn)
1271 {
1272         BT_DBG("hcon %p", conn);
1273
1274         /* In Secure Connections Only mode, it is required that Secure
1275          * Connections is used and the link is encrypted with AES-CCM
1276          * using a P-256 authenticated combination key.
1277          */
1278         if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1279                 if (!hci_conn_sc_enabled(conn) ||
1280                     !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1281                     conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1282                         return 0;
1283         }
1284
1285          /* AES encryption is required for Level 4:
1286           *
1287           * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
1288           * page 1319:
1289           *
1290           * 128-bit equivalent strength for link and encryption keys
1291           * required using FIPS approved algorithms (E0 not allowed,
1292           * SAFER+ not allowed, and P-192 not allowed; encryption key
1293           * not shortened)
1294           */
1295         if (conn->sec_level == BT_SECURITY_FIPS &&
1296             !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
1297                 bt_dev_err(conn->hdev,
1298                            "Invalid security: Missing AES-CCM usage");
1299                 return 0;
1300         }
1301
1302         if (hci_conn_ssp_enabled(conn) &&
1303             !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1304                 return 0;
1305
1306         return 1;
1307 }
1308
1309 /* Authenticate remote device */
1310 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1311 {
1312         BT_DBG("hcon %p", conn);
1313
1314         if (conn->pending_sec_level > sec_level)
1315                 sec_level = conn->pending_sec_level;
1316
1317         if (sec_level > conn->sec_level)
1318                 conn->pending_sec_level = sec_level;
1319         else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1320                 return 1;
1321
1322         /* Make sure we preserve an existing MITM requirement*/
1323         auth_type |= (conn->auth_type & 0x01);
1324
1325         conn->auth_type = auth_type;
1326
1327         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1328                 struct hci_cp_auth_requested cp;
1329
1330                 cp.handle = cpu_to_le16(conn->handle);
1331                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1332                              sizeof(cp), &cp);
1333
1334                 /* If we're already encrypted set the REAUTH_PEND flag,
1335                  * otherwise set the ENCRYPT_PEND.
1336                  */
1337                 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1338                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1339                 else
1340                         set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1341         }
1342
1343         return 0;
1344 }
1345
1346 /* Encrypt the the link */
1347 static void hci_conn_encrypt(struct hci_conn *conn)
1348 {
1349         BT_DBG("hcon %p", conn);
1350
1351         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1352                 struct hci_cp_set_conn_encrypt cp;
1353                 cp.handle  = cpu_to_le16(conn->handle);
1354                 cp.encrypt = 0x01;
1355                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1356                              &cp);
1357         }
1358 }
1359
1360 /* Enable security */
1361 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1362                       bool initiator)
1363 {
1364         BT_DBG("hcon %p", conn);
1365
1366         if (conn->type == LE_LINK)
1367                 return smp_conn_security(conn, sec_level);
1368
1369         /* For sdp we don't need the link key. */
1370         if (sec_level == BT_SECURITY_SDP)
1371                 return 1;
1372
1373         /* For non 2.1 devices and low security level we don't need the link
1374            key. */
1375         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1376                 return 1;
1377
1378         /* For other security levels we need the link key. */
1379         if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1380                 goto auth;
1381
1382         /* An authenticated FIPS approved combination key has sufficient
1383          * security for security level 4. */
1384         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1385             sec_level == BT_SECURITY_FIPS)
1386                 goto encrypt;
1387
1388         /* An authenticated combination key has sufficient security for
1389            security level 3. */
1390         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1391              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1392             sec_level == BT_SECURITY_HIGH)
1393                 goto encrypt;
1394
1395         /* An unauthenticated combination key has sufficient security for
1396            security level 1 and 2. */
1397         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1398              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1399             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1400                 goto encrypt;
1401
1402         /* A combination key has always sufficient security for the security
1403            levels 1 or 2. High security level requires the combination key
1404            is generated using maximum PIN code length (16).
1405            For pre 2.1 units. */
1406         if (conn->key_type == HCI_LK_COMBINATION &&
1407             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1408              conn->pin_length == 16))
1409                 goto encrypt;
1410
1411 auth:
1412         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1413                 return 0;
1414
1415         if (initiator)
1416                 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1417
1418         if (!hci_conn_auth(conn, sec_level, auth_type))
1419                 return 0;
1420
1421 encrypt:
1422         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1423                 /* Ensure that the encryption key size has been read,
1424                  * otherwise stall the upper layer responses.
1425                  */
1426                 if (!conn->enc_key_size)
1427                         return 0;
1428
1429                 /* Nothing else needed, all requirements are met */
1430                 return 1;
1431         }
1432
1433         hci_conn_encrypt(conn);
1434         return 0;
1435 }
1436 EXPORT_SYMBOL(hci_conn_security);
1437
1438 /* Check secure link requirement */
1439 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1440 {
1441         BT_DBG("hcon %p", conn);
1442
1443         /* Accept if non-secure or higher security level is required */
1444         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1445                 return 1;
1446
1447         /* Accept if secure or higher security level is already present */
1448         if (conn->sec_level == BT_SECURITY_HIGH ||
1449             conn->sec_level == BT_SECURITY_FIPS)
1450                 return 1;
1451
1452         /* Reject not secure link */
1453         return 0;
1454 }
1455 EXPORT_SYMBOL(hci_conn_check_secure);
1456
1457 /* Switch role */
1458 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1459 {
1460         BT_DBG("hcon %p", conn);
1461
1462         if (role == conn->role)
1463                 return 1;
1464
1465         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1466                 struct hci_cp_switch_role cp;
1467                 bacpy(&cp.bdaddr, &conn->dst);
1468                 cp.role = role;
1469                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1470         }
1471
1472         return 0;
1473 }
1474 EXPORT_SYMBOL(hci_conn_switch_role);
1475
1476 /* Enter active mode */
1477 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1478 {
1479         struct hci_dev *hdev = conn->hdev;
1480
1481         BT_DBG("hcon %p mode %d", conn, conn->mode);
1482
1483         if (conn->mode != HCI_CM_SNIFF)
1484                 goto timer;
1485
1486         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1487                 goto timer;
1488
1489         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1490                 struct hci_cp_exit_sniff_mode cp;
1491                 cp.handle = cpu_to_le16(conn->handle);
1492                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1493         }
1494
1495 timer:
1496         if (hdev->idle_timeout > 0)
1497                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1498                                    msecs_to_jiffies(hdev->idle_timeout));
1499 }
1500
1501 /* Drop all connection on the device */
1502 void hci_conn_hash_flush(struct hci_dev *hdev)
1503 {
1504         struct hci_conn_hash *h = &hdev->conn_hash;
1505         struct hci_conn *c, *n;
1506
1507         BT_DBG("hdev %s", hdev->name);
1508
1509         list_for_each_entry_safe(c, n, &h->list, list) {
1510                 c->state = BT_CLOSED;
1511
1512                 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1513                 hci_conn_del(c);
1514         }
1515 }
1516
1517 /* Check pending connect attempts */
1518 void hci_conn_check_pending(struct hci_dev *hdev)
1519 {
1520         struct hci_conn *conn;
1521
1522         BT_DBG("hdev %s", hdev->name);
1523
1524         hci_dev_lock(hdev);
1525
1526         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1527         if (conn)
1528                 hci_acl_create_connection(conn);
1529
1530         hci_dev_unlock(hdev);
1531 }
1532
1533 static u32 get_link_mode(struct hci_conn *conn)
1534 {
1535         u32 link_mode = 0;
1536
1537         if (conn->role == HCI_ROLE_MASTER)
1538                 link_mode |= HCI_LM_MASTER;
1539
1540         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1541                 link_mode |= HCI_LM_ENCRYPT;
1542
1543         if (test_bit(HCI_CONN_AUTH, &conn->flags))
1544                 link_mode |= HCI_LM_AUTH;
1545
1546         if (test_bit(HCI_CONN_SECURE, &conn->flags))
1547                 link_mode |= HCI_LM_SECURE;
1548
1549         if (test_bit(HCI_CONN_FIPS, &conn->flags))
1550                 link_mode |= HCI_LM_FIPS;
1551
1552         return link_mode;
1553 }
1554
1555 int hci_get_conn_list(void __user *arg)
1556 {
1557         struct hci_conn *c;
1558         struct hci_conn_list_req req, *cl;
1559         struct hci_conn_info *ci;
1560         struct hci_dev *hdev;
1561         int n = 0, size, err;
1562
1563         if (copy_from_user(&req, arg, sizeof(req)))
1564                 return -EFAULT;
1565
1566         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1567                 return -EINVAL;
1568
1569         size = sizeof(req) + req.conn_num * sizeof(*ci);
1570
1571         cl = kmalloc(size, GFP_KERNEL);
1572         if (!cl)
1573                 return -ENOMEM;
1574
1575         hdev = hci_dev_get(req.dev_id);
1576         if (!hdev) {
1577                 kfree(cl);
1578                 return -ENODEV;
1579         }
1580
1581         ci = cl->conn_info;
1582
1583         hci_dev_lock(hdev);
1584         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1585                 bacpy(&(ci + n)->bdaddr, &c->dst);
1586                 (ci + n)->handle = c->handle;
1587                 (ci + n)->type  = c->type;
1588                 (ci + n)->out   = c->out;
1589                 (ci + n)->state = c->state;
1590                 (ci + n)->link_mode = get_link_mode(c);
1591                 if (++n >= req.conn_num)
1592                         break;
1593         }
1594         hci_dev_unlock(hdev);
1595
1596         cl->dev_id = hdev->id;
1597         cl->conn_num = n;
1598         size = sizeof(req) + n * sizeof(*ci);
1599
1600         hci_dev_put(hdev);
1601
1602         err = copy_to_user(arg, cl, size);
1603         kfree(cl);
1604
1605         return err ? -EFAULT : 0;
1606 }
1607
1608 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1609 {
1610         struct hci_conn_info_req req;
1611         struct hci_conn_info ci;
1612         struct hci_conn *conn;
1613         char __user *ptr = arg + sizeof(req);
1614
1615         if (copy_from_user(&req, arg, sizeof(req)))
1616                 return -EFAULT;
1617
1618         hci_dev_lock(hdev);
1619         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1620         if (conn) {
1621                 bacpy(&ci.bdaddr, &conn->dst);
1622                 ci.handle = conn->handle;
1623                 ci.type  = conn->type;
1624                 ci.out   = conn->out;
1625                 ci.state = conn->state;
1626                 ci.link_mode = get_link_mode(conn);
1627         }
1628         hci_dev_unlock(hdev);
1629
1630         if (!conn)
1631                 return -ENOENT;
1632
1633         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1634 }
1635
1636 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1637 {
1638         struct hci_auth_info_req req;
1639         struct hci_conn *conn;
1640
1641         if (copy_from_user(&req, arg, sizeof(req)))
1642                 return -EFAULT;
1643
1644         hci_dev_lock(hdev);
1645         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1646         if (conn)
1647                 req.type = conn->auth_type;
1648         hci_dev_unlock(hdev);
1649
1650         if (!conn)
1651                 return -ENOENT;
1652
1653         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1654 }
1655
1656 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1657 {
1658         struct hci_dev *hdev = conn->hdev;
1659         struct hci_chan *chan;
1660
1661         BT_DBG("%s hcon %p", hdev->name, conn);
1662
1663         if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1664                 BT_DBG("Refusing to create new hci_chan");
1665                 return NULL;
1666         }
1667
1668         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1669         if (!chan)
1670                 return NULL;
1671
1672         chan->conn = hci_conn_get(conn);
1673         skb_queue_head_init(&chan->data_q);
1674         chan->state = BT_CONNECTED;
1675
1676         list_add_rcu(&chan->list, &conn->chan_list);
1677
1678         return chan;
1679 }
1680
1681 void hci_chan_del(struct hci_chan *chan)
1682 {
1683         struct hci_conn *conn = chan->conn;
1684         struct hci_dev *hdev = conn->hdev;
1685
1686         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1687
1688         list_del_rcu(&chan->list);
1689
1690         synchronize_rcu();
1691
1692         /* Prevent new hci_chan's to be created for this hci_conn */
1693         set_bit(HCI_CONN_DROP, &conn->flags);
1694
1695         hci_conn_put(conn);
1696
1697         skb_queue_purge(&chan->data_q);
1698         kfree(chan);
1699 }
1700
1701 void hci_chan_list_flush(struct hci_conn *conn)
1702 {
1703         struct hci_chan *chan, *n;
1704
1705         BT_DBG("hcon %p", conn);
1706
1707         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1708                 hci_chan_del(chan);
1709 }
1710
1711 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1712                                                  __u16 handle)
1713 {
1714         struct hci_chan *hchan;
1715
1716         list_for_each_entry(hchan, &hcon->chan_list, list) {
1717                 if (hchan->handle == handle)
1718                         return hchan;
1719         }
1720
1721         return NULL;
1722 }
1723
1724 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1725 {
1726         struct hci_conn_hash *h = &hdev->conn_hash;
1727         struct hci_conn *hcon;
1728         struct hci_chan *hchan = NULL;
1729
1730         rcu_read_lock();
1731
1732         list_for_each_entry_rcu(hcon, &h->list, list) {
1733                 hchan = __hci_chan_lookup_handle(hcon, handle);
1734                 if (hchan)
1735                         break;
1736         }
1737
1738         rcu_read_unlock();
1739
1740         return hchan;
1741 }