net/bluetooth/hci_conn.c

   1 /*
   2    BlueZ - Bluetooth protocol stack for Linux
   3    Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
   4
   5    Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License version 2 as
   9    published by the Free Software Foundation;
  10
  11    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  12    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  13    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  14    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  15    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  16    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19
  20    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  21    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  22    SOFTWARE IS DISCLAIMED.
  23 */
  24
  25 /* Bluetooth HCI connection handling. */
  26
  27 #include <linux/export.h>
  28 #include <linux/debugfs.h>
  29
  30 #include <net/bluetooth/bluetooth.h>
  31 #include <net/bluetooth/hci_core.h>
  32 #include <net/bluetooth/l2cap.h>
  33
  34 #include "hci_request.h"
  35 #include "smp.h"
  36 #include "a2mp.h"
  37
  38 struct sco_param {
  39         u16 pkt_type;
  40         u16 max_latency;
  41         u8  retrans_effort;
  42 };
  43
  44 static const struct sco_param esco_param_cvsd[] = {
  45         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a,   0x01 }, /* S3 */
  46         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007,   0x01 }, /* S2 */
  47         { EDR_ESCO_MASK | ESCO_EV3,   0x0007,   0x01 }, /* S1 */
  48         { EDR_ESCO_MASK | ESCO_HV3,   0xffff,   0x01 }, /* D1 */
  49         { EDR_ESCO_MASK | ESCO_HV1,   0xffff,   0x01 }, /* D0 */
  50 };
  51
  52 static const struct sco_param sco_param_cvsd[] = {
  53         { EDR_ESCO_MASK | ESCO_HV3,   0xffff,   0xff }, /* D1 */
  54         { EDR_ESCO_MASK | ESCO_HV1,   0xffff,   0xff }, /* D0 */
  55 };
  56
  57 static const struct sco_param esco_param_msbc[] = {
  58         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d,   0x02 }, /* T2 */
  59         { EDR_ESCO_MASK | ESCO_EV3,   0x0008,   0x02 }, /* T1 */
  60 };
  61
  62 /* This function requires the caller holds hdev->lock */
  63 static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
  64 {
  65         struct hci_conn_params *params;
  66         struct hci_dev *hdev = conn->hdev;
  67         struct smp_irk *irk;
  68         bdaddr_t *bdaddr;
  69         u8 bdaddr_type;
  70
  71         bdaddr = &conn->dst;
  72         bdaddr_type = conn->dst_type;
  73
  74         /* Check if we need to convert to identity address */
  75         irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
  76         if (irk) {
  77                 bdaddr = &irk->bdaddr;
  78                 bdaddr_type = irk->addr_type;
  79         }
  80
  81         params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
  82                                            bdaddr_type);
  83         if (!params || !params->explicit_connect)
  84                 return;
  85
  86         /* The connection attempt was doing scan for new RPA, and is
  87          * in scan phase. If params are not associated with any other
  88          * autoconnect action, remove them completely. If they are, just unmark
  89          * them as waiting for connection, by clearing explicit_connect field.
  90          */
  91         params->explicit_connect = false;
  92
  93         list_del_init(&params->action);
  94
  95         switch (params->auto_connect) {
  96         case HCI_AUTO_CONN_EXPLICIT:
  97                 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
  98                 /* return instead of break to avoid duplicate scan update */
  99                 return;
 100         case HCI_AUTO_CONN_DIRECT:
 101         case HCI_AUTO_CONN_ALWAYS:
 102                 list_add(&params->action, &hdev->pend_le_conns);
 103                 break;
 104         case HCI_AUTO_CONN_REPORT:
 105                 list_add(&params->action, &hdev->pend_le_reports);
 106                 break;
 107         default:
 108                 break;
 109         }
 110
 111         hci_update_background_scan(hdev);
 112 }
 113
 114 static void hci_conn_cleanup(struct hci_conn *conn)
 115 {
 116         struct hci_dev *hdev = conn->hdev;
 117
 118         if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
 119                 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
 120
 121         hci_chan_list_flush(conn);
 122
 123         hci_conn_hash_del(hdev, conn);
 124
 125         if (hdev->notify)
 126                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 127
 128         hci_conn_del_sysfs(conn);
 129
 130         debugfs_remove_recursive(conn->debugfs);
 131
 132         hci_dev_put(hdev);
 133
 134         hci_conn_put(conn);
 135 }
 136
 137 static void le_scan_cleanup(struct work_struct *work)
 138 {
 139         struct hci_conn *conn = container_of(work, struct hci_conn,
 140                                              le_scan_cleanup);
 141         struct hci_dev *hdev = conn->hdev;
 142         struct hci_conn *c = NULL;
 143
 144         BT_DBG("%s hcon %p", hdev->name, conn);
 145
 146         hci_dev_lock(hdev);
 147
 148         /* Check that the hci_conn is still around */
 149         rcu_read_lock();
 150         list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
 151                 if (c == conn)
 152                         break;
 153         }
 154         rcu_read_unlock();
 155
 156         if (c == conn) {
 157                 hci_connect_le_scan_cleanup(conn);
 158                 hci_conn_cleanup(conn);
 159         }
 160
 161         hci_dev_unlock(hdev);
 162         hci_dev_put(hdev);
 163         hci_conn_put(conn);
 164 }
 165
 166 static void hci_connect_le_scan_remove(struct hci_conn *conn)
 167 {
 168         BT_DBG("%s hcon %p", conn->hdev->name, conn);
 169
 170         /* We can't call hci_conn_del/hci_conn_cleanup here since that
 171          * could deadlock with another hci_conn_del() call that's holding
 172          * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
 173          * Instead, grab temporary extra references to the hci_dev and
 174          * hci_conn and perform the necessary cleanup in a separate work
 175          * callback.
 176          */
 177
 178         hci_dev_hold(conn->hdev);
 179         hci_conn_get(conn);
 180
 181         /* Even though we hold a reference to the hdev, many other
 182          * things might get cleaned up meanwhile, including the hdev's
 183          * own workqueue, so we can't use that for scheduling.
 184          */
 185         schedule_work(&conn->le_scan_cleanup);
 186 }
 187
 188 static void hci_acl_create_connection(struct hci_conn *conn)
 189 {
 190         struct hci_dev *hdev = conn->hdev;
 191         struct inquiry_entry *ie;
 192         struct hci_cp_create_conn cp;
 193
 194         BT_DBG("hcon %p", conn);
 195
 196         conn->state = BT_CONNECT;
 197         conn->out = true;
 198         conn->role = HCI_ROLE_MASTER;
 199
 200         conn->attempt++;
 201
 202         conn->link_policy = hdev->link_policy;
 203
 204         memset(&cp, 0, sizeof(cp));
 205         bacpy(&cp.bdaddr, &conn->dst);
 206         cp.pscan_rep_mode = 0x02;
 207
 208         ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
 209         if (ie) {
 210                 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
 211                         cp.pscan_rep_mode = ie->data.pscan_rep_mode;
 212                         cp.pscan_mode     = ie->data.pscan_mode;
 213                         cp.clock_offset   = ie->data.clock_offset |
 214                                             cpu_to_le16(0x8000);
 215                 }
 216
 217                 memcpy(conn->dev_class, ie->data.dev_class, 3);
 218                 if (ie->data.ssp_mode > 0)
 219                         set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
 220         }
 221
 222         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 223         if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
 224                 cp.role_switch = 0x01;
 225         else
 226                 cp.role_switch = 0x00;
 227
 228         hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
 229 }
 230
 231 int hci_disconnect(struct hci_conn *conn, __u8 reason)
 232 {
 233         BT_DBG("hcon %p", conn);
 234
 235         /* When we are master of an established connection and it enters
 236          * the disconnect timeout, then go ahead and try to read the
 237          * current clock offset.  Processing of the result is done
 238          * within the event handling and hci_clock_offset_evt function.
 239          */
 240         if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
 241             (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
 242                 struct hci_dev *hdev = conn->hdev;
 243                 struct hci_cp_read_clock_offset clkoff_cp;
 244
 245                 clkoff_cp.handle = cpu_to_le16(conn->handle);
 246                 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
 247                              &clkoff_cp);
 248         }
 249
 250         return hci_abort_conn(conn, reason);
 251 }
 252
 253 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
 254 {
 255         struct hci_dev *hdev = conn->hdev;
 256         struct hci_cp_add_sco cp;
 257
 258         BT_DBG("hcon %p", conn);
 259
 260         conn->state = BT_CONNECT;
 261         conn->out = true;
 262
 263         conn->attempt++;
 264
 265         cp.handle   = cpu_to_le16(handle);
 266         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 267
 268         hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 269 }
 270
 271 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
 272 {
 273         struct hci_dev *hdev = conn->hdev;
 274         struct hci_cp_setup_sync_conn cp;
 275         const struct sco_param *param;
 276
 277         BT_DBG("hcon %p", conn);
 278
 279         conn->state = BT_CONNECT;
 280         conn->out = true;
 281
 282         conn->attempt++;
 283
 284         cp.handle   = cpu_to_le16(handle);
 285
 286         cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
 287         cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
 288         cp.voice_setting  = cpu_to_le16(conn->setting);
 289
 290         switch (conn->setting & SCO_AIRMODE_MASK) {
 291         case SCO_AIRMODE_TRANSP:
 292                 if (conn->attempt > ARRAY_SIZE(esco_param_msbc))
 293                         return false;
 294                 param = &esco_param_msbc[conn->attempt - 1];
 295                 break;
 296         case SCO_AIRMODE_CVSD:
 297                 if (lmp_esco_capable(conn->link)) {
 298                         if (conn->attempt > ARRAY_SIZE(esco_param_cvsd))
 299                                 return false;
 300                         param = &esco_param_cvsd[conn->attempt - 1];
 301                 } else {
 302                         if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
 303                                 return false;
 304                         param = &sco_param_cvsd[conn->attempt - 1];
 305                 }
 306                 break;
 307         default:
 308                 return false;
 309         }
 310
 311         cp.retrans_effort = param->retrans_effort;
 312         cp.pkt_type = __cpu_to_le16(param->pkt_type);
 313         cp.max_latency = __cpu_to_le16(param->max_latency);
 314
 315         if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
 316                 return false;
 317
 318         return true;
 319 }
 320
 321 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
 322                       u16 to_multiplier)
 323 {
 324         struct hci_dev *hdev = conn->hdev;
 325         struct hci_conn_params *params;
 326         struct hci_cp_le_conn_update cp;
 327
 328         hci_dev_lock(hdev);
 329
 330         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 331         if (params) {
 332                 params->conn_min_interval = min;
 333                 params->conn_max_interval = max;
 334                 params->conn_latency = latency;
 335                 params->supervision_timeout = to_multiplier;
 336         }
 337
 338         hci_dev_unlock(hdev);
 339
 340         memset(&cp, 0, sizeof(cp));
 341         cp.handle               = cpu_to_le16(conn->handle);
 342         cp.conn_interval_min    = cpu_to_le16(min);
 343         cp.conn_interval_max    = cpu_to_le16(max);
 344         cp.conn_latency         = cpu_to_le16(latency);
 345         cp.supervision_timeout  = cpu_to_le16(to_multiplier);
 346         cp.min_ce_len           = cpu_to_le16(0x0000);
 347         cp.max_ce_len           = cpu_to_le16(0x0000);
 348
 349         hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
 350
 351         if (params)
 352                 return 0x01;
 353
 354         return 0x00;
 355 }
 356
 357 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
 358                       __u8 ltk[16], __u8 key_size)
 359 {
 360         struct hci_dev *hdev = conn->hdev;
 361         struct hci_cp_le_start_enc cp;
 362
 363         BT_DBG("hcon %p", conn);
 364
 365         memset(&cp, 0, sizeof(cp));
 366
 367         cp.handle = cpu_to_le16(conn->handle);
 368         cp.rand = rand;
 369         cp.ediv = ediv;
 370         memcpy(cp.ltk, ltk, key_size);
 371
 372         hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
 373 }
 374
 375 /* Device _must_ be locked */
 376 void hci_sco_setup(struct hci_conn *conn, __u8 status)
 377 {
 378         struct hci_conn *sco = conn->link;
 379
 380         if (!sco)
 381                 return;
 382
 383         BT_DBG("hcon %p", conn);
 384
 385         if (!status) {
 386                 if (lmp_esco_capable(conn->hdev))
 387                         hci_setup_sync(sco, conn->handle);
 388                 else
 389                         hci_add_sco(sco, conn->handle);
 390         } else {
 391                 hci_connect_cfm(sco, status);
 392                 hci_conn_del(sco);
 393         }
 394 }
 395
 396 static void hci_conn_timeout(struct work_struct *work)
 397 {
 398         struct hci_conn *conn = container_of(work, struct hci_conn,
 399                                              disc_work.work);
 400         int refcnt = atomic_read(&conn->refcnt);
 401
 402         BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
 403
 404         WARN_ON(refcnt < 0);
 405
 406         /* FIXME: It was observed that in pairing failed scenario, refcnt
 407          * drops below 0. Probably this is because l2cap_conn_del calls
 408          * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
 409          * dropped. After that loop hci_chan_del is called which also drops
 410          * conn. For now make sure that ACL is alive if refcnt is higher then 0,
 411          * otherwise drop it.
 412          */
 413         if (refcnt > 0)
 414                 return;
 415
 416         /* LE connections in scanning state need special handling */
 417         if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
 418             test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 419                 hci_connect_le_scan_remove(conn);
 420                 return;
 421         }
 422
 423         hci_abort_conn(conn, hci_proto_disconn_ind(conn));
 424 }
 425
 426 /* Enter sniff mode */
 427 static void hci_conn_idle(struct work_struct *work)
 428 {
 429         struct hci_conn *conn = container_of(work, struct hci_conn,
 430                                              idle_work.work);
 431         struct hci_dev *hdev = conn->hdev;
 432
 433         BT_DBG("hcon %p mode %d", conn, conn->mode);
 434
 435         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 436                 return;
 437
 438         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 439                 return;
 440
 441         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 442                 struct hci_cp_sniff_subrate cp;
 443                 cp.handle             = cpu_to_le16(conn->handle);
 444                 cp.max_latency        = cpu_to_le16(0);
 445                 cp.min_remote_timeout = cpu_to_le16(0);
 446                 cp.min_local_timeout  = cpu_to_le16(0);
 447                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 448         }
 449
 450         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 451                 struct hci_cp_sniff_mode cp;
 452                 cp.handle       = cpu_to_le16(conn->handle);
 453                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 454                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 455                 cp.attempt      = cpu_to_le16(4);
 456                 cp.timeout      = cpu_to_le16(1);
 457                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 458         }
 459 }
 460
 461 static void hci_conn_auto_accept(struct work_struct *work)
 462 {
 463         struct hci_conn *conn = container_of(work, struct hci_conn,
 464                                              auto_accept_work.work);
 465
 466         hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
 467                      &conn->dst);
 468 }
 469
 470 static void le_conn_timeout(struct work_struct *work)
 471 {
 472         struct hci_conn *conn = container_of(work, struct hci_conn,
 473                                              le_conn_timeout.work);
 474         struct hci_dev *hdev = conn->hdev;
 475
 476         BT_DBG("");
 477
 478         /* We could end up here due to having done directed advertising,
 479          * so clean up the state if necessary. This should however only
 480          * happen with broken hardware or if low duty cycle was used
 481          * (which doesn't have a timeout of its own).
 482          */
 483         if (conn->role == HCI_ROLE_SLAVE) {
 484                 u8 enable = 0x00;
 485                 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 486                              &enable);
 487                 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
 488                 return;
 489         }
 490
 491         hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
 492 }
 493
 494 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
 495                               u8 role)
 496 {
 497         struct hci_conn *conn;
 498
 499         BT_DBG("%s dst %pMR", hdev->name, dst);
 500
 501         conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 502         if (!conn)
 503                 return NULL;
 504
 505         bacpy(&conn->dst, dst);
 506         bacpy(&conn->src, &hdev->bdaddr);
 507         conn->hdev  = hdev;
 508         conn->type  = type;
 509         conn->role  = role;
 510         conn->mode  = HCI_CM_ACTIVE;
 511         conn->state = BT_OPEN;
 512         conn->auth_type = HCI_AT_GENERAL_BONDING;
 513         conn->io_capability = hdev->io_capability;
 514         conn->remote_auth = 0xff;
 515         conn->key_type = 0xff;
 516         conn->rssi = HCI_RSSI_INVALID;
 517         conn->tx_power = HCI_TX_POWER_INVALID;
 518         conn->max_tx_power = HCI_TX_POWER_INVALID;
 519
 520         set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
 521         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 522
 523         if (conn->role == HCI_ROLE_MASTER)
 524                 conn->out = true;
 525
 526         switch (type) {
 527         case ACL_LINK:
 528                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 529                 break;
 530         case LE_LINK:
 531                 /* conn->src should reflect the local identity address */
 532                 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
 533                 break;
 534         case SCO_LINK:
 535                 if (lmp_esco_capable(hdev))
 536                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 537                                         (hdev->esco_type & EDR_ESCO_MASK);
 538                 else
 539                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 540                 break;
 541         case ESCO_LINK:
 542                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 543                 break;
 544         }
 545
 546         skb_queue_head_init(&conn->data_q);
 547
 548         INIT_LIST_HEAD(&conn->chan_list);
 549
 550         INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
 551         INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
 552         INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
 553         INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
 554         INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
 555
 556         atomic_set(&conn->refcnt, 0);
 557
 558         hci_dev_hold(hdev);
 559
 560         hci_conn_hash_add(hdev, conn);
 561         if (hdev->notify)
 562                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 563
 564         hci_conn_init_sysfs(conn);
 565
 566         return conn;
 567 }
 568
 569 int hci_conn_del(struct hci_conn *conn)
 570 {
 571         struct hci_dev *hdev = conn->hdev;
 572
 573         BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
 574
 575         cancel_delayed_work_sync(&conn->disc_work);
 576         cancel_delayed_work_sync(&conn->auto_accept_work);
 577         cancel_delayed_work_sync(&conn->idle_work);
 578
 579         if (conn->type == ACL_LINK) {
 580                 struct hci_conn *sco = conn->link;
 581                 if (sco)
 582                         sco->link = NULL;
 583
 584                 /* Unacked frames */
 585                 hdev->acl_cnt += conn->sent;
 586         } else if (conn->type == LE_LINK) {
 587                 cancel_delayed_work(&conn->le_conn_timeout);
 588
 589                 if (hdev->le_pkts)
 590                         hdev->le_cnt += conn->sent;
 591                 else
 592                         hdev->acl_cnt += conn->sent;
 593         } else {
 594                 struct hci_conn *acl = conn->link;
 595                 if (acl) {
 596                         acl->link = NULL;
 597                         hci_conn_drop(acl);
 598                 }
 599         }
 600
 601         if (conn->amp_mgr)
 602                 amp_mgr_put(conn->amp_mgr);
 603
 604         skb_queue_purge(&conn->data_q);
 605
 606         /* Remove the connection from the list and cleanup its remaining
 607          * state. This is a separate function since for some cases like
 608          * BT_CONNECT_SCAN we *only* want the cleanup part without the
 609          * rest of hci_conn_del.
 610          */
 611         hci_conn_cleanup(conn);
 612
 613         return 0;
 614 }
 615
 616 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
 617 {
 618         int use_src = bacmp(src, BDADDR_ANY);
 619         struct hci_dev *hdev = NULL, *d;
 620
 621         BT_DBG("%pMR -> %pMR", src, dst);
 622
 623         read_lock(&hci_dev_list_lock);
 624
 625         list_for_each_entry(d, &hci_dev_list, list) {
 626                 if (!test_bit(HCI_UP, &d->flags) ||
 627                     hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
 628                     d->dev_type != HCI_PRIMARY)
 629                         continue;
 630
 631                 /* Simple routing:
 632                  *   No source address - find interface with bdaddr != dst
 633                  *   Source address    - find interface with bdaddr == src
 634                  */
 635
 636                 if (use_src) {
 637                         bdaddr_t id_addr;
 638                         u8 id_addr_type;
 639
 640                         if (src_type == BDADDR_BREDR) {
 641                                 if (!lmp_bredr_capable(d))
 642                                         continue;
 643                                 bacpy(&id_addr, &d->bdaddr);
 644                                 id_addr_type = BDADDR_BREDR;
 645                         } else {
 646                                 if (!lmp_le_capable(d))
 647                                         continue;
 648
 649                                 hci_copy_identity_address(d, &id_addr,
 650                                                           &id_addr_type);
 651
 652                                 /* Convert from HCI to three-value type */
 653                                 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
 654                                         id_addr_type = BDADDR_LE_PUBLIC;
 655                                 else
 656                                         id_addr_type = BDADDR_LE_RANDOM;
 657                         }
 658
 659                         if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
 660                                 hdev = d; break;
 661                         }
 662                 } else {
 663                         if (bacmp(&d->bdaddr, dst)) {
 664                                 hdev = d; break;
 665                         }
 666                 }
 667         }
 668
 669         if (hdev)
 670                 hdev = hci_dev_hold(hdev);
 671
 672         read_unlock(&hci_dev_list_lock);
 673         return hdev;
 674 }
 675 EXPORT_SYMBOL(hci_get_route);
 676
 677 /* This function requires the caller holds hdev->lock */
 678 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 679 {
 680         struct hci_dev *hdev = conn->hdev;
 681         struct hci_conn_params *params;
 682
 683         params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
 684                                            conn->dst_type);
 685         if (params && params->conn) {
 686                 hci_conn_drop(params->conn);
 687                 hci_conn_put(params->conn);
 688                 params->conn = NULL;
 689         }
 690
 691         conn->state = BT_CLOSED;
 692
 693         /* If the status indicates successful cancellation of
 694          * the attempt (i.e. Unkown Connection Id) there's no point of
 695          * notifying failure since we'll go back to keep trying to
 696          * connect. The only exception is explicit connect requests
 697          * where a timeout + cancel does indicate an actual failure.
 698          */
 699         if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
 700             (params && params->explicit_connect))
 701                 mgmt_connect_failed(hdev, &conn->dst, conn->type,
 702                                     conn->dst_type, status);
 703
 704         hci_connect_cfm(conn, status);
 705
 706         hci_conn_del(conn);
 707
 708         /* Since we may have temporarily stopped the background scanning in
 709          * favor of connection establishment, we should restart it.
 710          */
 711         hci_update_background_scan(hdev);
 712
 713         /* Re-enable advertising in case this was a failed connection
 714          * attempt as a peripheral.
 715          */
 716         hci_req_reenable_advertising(hdev);
 717 }
 718
 719 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 720 {
 721         struct hci_conn *conn;
 722
 723         hci_dev_lock(hdev);
 724
 725         conn = hci_lookup_le_connect(hdev);
 726
 727         if (!status) {
 728                 hci_connect_le_scan_cleanup(conn);
 729                 goto done;
 730         }
 731
 732         BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
 733                status);
 734
 735         if (!conn)
 736                 goto done;
 737
 738         hci_le_conn_failed(conn, status);
 739
 740 done:
 741         hci_dev_unlock(hdev);
 742 }
 743
 744 static bool conn_use_rpa(struct hci_conn *conn)
 745 {
 746         struct hci_dev *hdev = conn->hdev;
 747
 748         return hci_dev_test_flag(hdev, HCI_PRIVACY);
 749 }
 750
 751 static void hci_req_add_le_create_conn(struct hci_request *req,
 752                                        struct hci_conn *conn,
 753                                        bdaddr_t *direct_rpa)
 754 {
 755         struct hci_cp_le_create_conn cp;
 756         struct hci_dev *hdev = conn->hdev;
 757         u8 own_addr_type;
 758
 759         /* If direct address was provided we use it instead of current
 760          * address.
 761          */
 762         if (direct_rpa) {
 763                 if (bacmp(&req->hdev->random_addr, direct_rpa))
 764                         hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
 765                                                                 direct_rpa);
 766
 767                 /* direct address is always RPA */
 768                 own_addr_type = ADDR_LE_DEV_RANDOM;
 769         } else {
 770                 /* Update random address, but set require_privacy to false so
 771                  * that we never connect with an non-resolvable address.
 772                  */
 773                 if (hci_update_random_address(req, false, conn_use_rpa(conn),
 774                                               &own_addr_type))
 775                         return;
 776         }
 777
 778         memset(&cp, 0, sizeof(cp));
 779
 780         /* Set window to be the same value as the interval to enable
 781          * continuous scanning.
 782          */
 783         cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
 784         cp.scan_window = cp.scan_interval;
 785
 786         bacpy(&cp.peer_addr, &conn->dst);
 787         cp.peer_addr_type = conn->dst_type;
 788         cp.own_address_type = own_addr_type;
 789         cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 790         cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 791         cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
 792         cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 793         cp.min_ce_len = cpu_to_le16(0x0000);
 794         cp.max_ce_len = cpu_to_le16(0x0000);
 795
 796         hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 797
 798         conn->state = BT_CONNECT;
 799         clear_bit(HCI_CONN_SCANNING, &conn->flags);
 800 }
 801
 802 static void hci_req_directed_advertising(struct hci_request *req,
 803                                          struct hci_conn *conn)
 804 {
 805         struct hci_dev *hdev = req->hdev;
 806         struct hci_cp_le_set_adv_param cp;
 807         u8 own_addr_type;
 808         u8 enable;
 809
 810         /* Clear the HCI_LE_ADV bit temporarily so that the
 811          * hci_update_random_address knows that it's safe to go ahead
 812          * and write a new random address. The flag will be set back on
 813          * as soon as the SET_ADV_ENABLE HCI command completes.
 814          */
 815         hci_dev_clear_flag(hdev, HCI_LE_ADV);
 816
 817         /* Set require_privacy to false so that the remote device has a
 818          * chance of identifying us.
 819          */
 820         if (hci_update_random_address(req, false, conn_use_rpa(conn),
 821                                       &own_addr_type) < 0)
 822                 return;
 823
 824         memset(&cp, 0, sizeof(cp));
 825         cp.type = LE_ADV_DIRECT_IND;
 826         cp.own_address_type = own_addr_type;
 827         cp.direct_addr_type = conn->dst_type;
 828         bacpy(&cp.direct_addr, &conn->dst);
 829         cp.channel_map = hdev->le_adv_channel_map;
 830
 831         hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
 832
 833         enable = 0x01;
 834         hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
 835
 836         conn->state = BT_CONNECT;
 837 }
 838
 839 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 840                                 u8 dst_type, u8 sec_level, u16 conn_timeout,
 841                                 u8 role, bdaddr_t *direct_rpa)
 842 {
 843         struct hci_conn_params *params;
 844         struct hci_conn *conn;
 845         struct smp_irk *irk;
 846         struct hci_request req;
 847         int err;
 848
 849         /* Let's make sure that le is enabled.*/
 850         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
 851                 if (lmp_le_capable(hdev))
 852                         return ERR_PTR(-ECONNREFUSED);
 853
 854                 return ERR_PTR(-EOPNOTSUPP);
 855         }
 856
 857         /* Since the controller supports only one LE connection attempt at a
 858          * time, we return -EBUSY if there is any connection attempt running.
 859          */
 860         if (hci_lookup_le_connect(hdev))
 861                 return ERR_PTR(-EBUSY);
 862
 863         /* If there's already a connection object but it's not in
 864          * scanning state it means it must already be established, in
 865          * which case we can't do anything else except report a failure
 866          * to connect.
 867          */
 868         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
 869         if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 870                 return ERR_PTR(-EBUSY);
 871         }
 872
 873         /* When given an identity address with existing identity
 874          * resolving key, the connection needs to be established
 875          * to a resolvable random address.
 876          *
 877          * Storing the resolvable random address is required here
 878          * to handle connection failures. The address will later
 879          * be resolved back into the original identity address
 880          * from the connect request.
 881          */
 882         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
 883         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
 884                 dst = &irk->rpa;
 885                 dst_type = ADDR_LE_DEV_RANDOM;
 886         }
 887
 888         if (conn) {
 889                 bacpy(&conn->dst, dst);
 890         } else {
 891                 conn = hci_conn_add(hdev, LE_LINK, dst, role);
 892                 if (!conn)
 893                         return ERR_PTR(-ENOMEM);
 894                 hci_conn_hold(conn);
 895                 conn->pending_sec_level = sec_level;
 896         }
 897
 898         conn->dst_type = dst_type;
 899         conn->sec_level = BT_SECURITY_LOW;
 900         conn->conn_timeout = conn_timeout;
 901
 902         hci_req_init(&req, hdev);
 903
 904         /* Disable advertising if we're active. For master role
 905          * connections most controllers will refuse to connect if
 906          * advertising is enabled, and for slave role connections we
 907          * anyway have to disable it in order to start directed
 908          * advertising.
 909          */
 910         if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
 911                 u8 enable = 0x00;
 912                 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 913                             &enable);
 914         }
 915
 916         /* If requested to connect as slave use directed advertising */
 917         if (conn->role == HCI_ROLE_SLAVE) {
 918                 /* If we're active scanning most controllers are unable
 919                  * to initiate advertising. Simply reject the attempt.
 920                  */
 921                 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
 922                     hdev->le_scan_type == LE_SCAN_ACTIVE) {
 923                         skb_queue_purge(&req.cmd_q);
 924                         hci_conn_del(conn);
 925                         return ERR_PTR(-EBUSY);
 926                 }
 927
 928                 hci_req_directed_advertising(&req, conn);
 929                 goto create_conn;
 930         }
 931
 932         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 933         if (params) {
 934                 conn->le_conn_min_interval = params->conn_min_interval;
 935                 conn->le_conn_max_interval = params->conn_max_interval;
 936                 conn->le_conn_latency = params->conn_latency;
 937                 conn->le_supv_timeout = params->supervision_timeout;
 938         } else {
 939                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
 940                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
 941                 conn->le_conn_latency = hdev->le_conn_latency;
 942                 conn->le_supv_timeout = hdev->le_supv_timeout;
 943         }
 944
 945         /* If controller is scanning, we stop it since some controllers are
 946          * not able to scan and connect at the same time. Also set the
 947          * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
 948          * handler for scan disabling knows to set the correct discovery
 949          * state.
 950          */
 951         if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
 952                 hci_req_add_le_scan_disable(&req);
 953                 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
 954         }
 955
 956         hci_req_add_le_create_conn(&req, conn, direct_rpa);
 957
 958 create_conn:
 959         err = hci_req_run(&req, create_le_conn_complete);
 960         if (err) {
 961                 hci_conn_del(conn);
 962                 return ERR_PTR(err);
 963         }
 964
 965         return conn;
 966 }
 967
 968 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
 969 {
 970         struct hci_conn *conn;
 971
 972         conn = hci_conn_hash_lookup_le(hdev, addr, type);
 973         if (!conn)
 974                 return false;
 975
 976         if (conn->state != BT_CONNECTED)
 977                 return false;
 978
 979         return true;
 980 }
 981
 982 /* This function requires the caller holds hdev->lock */
 983 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
 984                                         bdaddr_t *addr, u8 addr_type)
 985 {
 986         struct hci_conn_params *params;
 987
 988         if (is_connected(hdev, addr, addr_type))
 989                 return -EISCONN;
 990
 991         params = hci_conn_params_lookup(hdev, addr, addr_type);
 992         if (!params) {
 993                 params = hci_conn_params_add(hdev, addr, addr_type);
 994                 if (!params)
 995                         return -ENOMEM;
 996
 997                 /* If we created new params, mark them to be deleted in
 998                  * hci_connect_le_scan_cleanup. It's different case than
 999                  * existing disabled params, those will stay after cleanup.
1000                  */
1001                 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1002         }
1003
1004         /* We're trying to connect, so make sure params are at pend_le_conns */
1005         if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1006             params->auto_connect == HCI_AUTO_CONN_REPORT ||
1007             params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1008                 list_del_init(&params->action);
1009                 list_add(&params->action, &hdev->pend_le_conns);
1010         }
1011
1012         params->explicit_connect = true;
1013
1014         BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1015                params->auto_connect);
1016
1017         return 0;
1018 }
1019
1020 /* This function requires the caller holds hdev->lock */
1021 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1022                                      u8 dst_type, u8 sec_level,
1023                                      u16 conn_timeout)
1024 {
1025         struct hci_conn *conn;
1026
1027         /* Let's make sure that le is enabled.*/
1028         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1029                 if (lmp_le_capable(hdev))
1030                         return ERR_PTR(-ECONNREFUSED);
1031
1032                 return ERR_PTR(-EOPNOTSUPP);
1033         }
1034
1035         /* Some devices send ATT messages as soon as the physical link is
1036          * established. To be able to handle these ATT messages, the user-
1037          * space first establishes the connection and then starts the pairing
1038          * process.
1039          *
1040          * So if a hci_conn object already exists for the following connection
1041          * attempt, we simply update pending_sec_level and auth_type fields
1042          * and return the object found.
1043          */
1044         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1045         if (conn) {
1046                 if (conn->pending_sec_level < sec_level)
1047                         conn->pending_sec_level = sec_level;
1048                 goto done;
1049         }
1050
1051         BT_DBG("requesting refresh of dst_addr");
1052
1053         conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1054         if (!conn)
1055                 return ERR_PTR(-ENOMEM);
1056
1057         if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1058                 hci_conn_del(conn);
1059                 return ERR_PTR(-EBUSY);
1060         }
1061
1062         conn->state = BT_CONNECT;
1063         set_bit(HCI_CONN_SCANNING, &conn->flags);
1064         conn->dst_type = dst_type;
1065         conn->sec_level = BT_SECURITY_LOW;
1066         conn->pending_sec_level = sec_level;
1067         conn->conn_timeout = conn_timeout;
1068
1069         hci_update_background_scan(hdev);
1070
1071 done:
1072         hci_conn_hold(conn);
1073         return conn;
1074 }
1075
1076 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1077                                  u8 sec_level, u8 auth_type)
1078 {
1079         struct hci_conn *acl;
1080
1081         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1082                 if (lmp_bredr_capable(hdev))
1083                         return ERR_PTR(-ECONNREFUSED);
1084
1085                 return ERR_PTR(-EOPNOTSUPP);
1086         }
1087
1088         /* Reject outgoing connection to device with same BD ADDR against
1089          * CVE-2020-26555
1090          */
1091         if (!bacmp(&hdev->bdaddr, dst)) {
1092                 bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n",
1093                            dst);
1094                 return ERR_PTR(-ECONNREFUSED);
1095         }
1096
1097         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1098         if (!acl) {
1099                 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1100                 if (!acl)
1101                         return ERR_PTR(-ENOMEM);
1102         }
1103
1104         hci_conn_hold(acl);
1105
1106         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1107                 acl->sec_level = BT_SECURITY_LOW;
1108                 acl->pending_sec_level = sec_level;
1109                 acl->auth_type = auth_type;
1110                 hci_acl_create_connection(acl);
1111         }
1112
1113         return acl;
1114 }
1115
1116 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1117                                  __u16 setting)
1118 {
1119         struct hci_conn *acl;
1120         struct hci_conn *sco;
1121
1122         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1123         if (IS_ERR(acl))
1124                 return acl;
1125
1126         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1127         if (!sco) {
1128                 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1129                 if (!sco) {
1130                         hci_conn_drop(acl);
1131                         return ERR_PTR(-ENOMEM);
1132                 }
1133         }
1134
1135         acl->link = sco;
1136         sco->link = acl;
1137
1138         hci_conn_hold(sco);
1139
1140         sco->setting = setting;
1141
1142         if (acl->state == BT_CONNECTED &&
1143             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1144                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1145                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1146
1147                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1148                         /* defer SCO setup until mode change completed */
1149                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1150                         return sco;
1151                 }
1152
1153                 hci_sco_setup(acl, 0x00);
1154         }
1155
1156         return sco;
1157 }
1158
1159 /* Check link security requirement */
1160 int hci_conn_check_link_mode(struct hci_conn *conn)
1161 {
1162         BT_DBG("hcon %p", conn);
1163
1164         /* In Secure Connections Only mode, it is required that Secure
1165          * Connections is used and the link is encrypted with AES-CCM
1166          * using a P-256 authenticated combination key.
1167          */
1168         if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1169                 if (!hci_conn_sc_enabled(conn) ||
1170                     !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1171                     conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1172                         return 0;
1173         }
1174
1175          /* AES encryption is required for Level 4:
1176           *
1177           * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
1178           * page 1319:
1179           *
1180           * 128-bit equivalent strength for link and encryption keys
1181           * required using FIPS approved algorithms (E0 not allowed,
1182           * SAFER+ not allowed, and P-192 not allowed; encryption key
1183           * not shortened)
1184           */
1185         if (conn->sec_level == BT_SECURITY_FIPS &&
1186             !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
1187                 bt_dev_err(conn->hdev,
1188                            "Invalid security: Missing AES-CCM usage");
1189                 return 0;
1190         }
1191
1192         if (hci_conn_ssp_enabled(conn) &&
1193             !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1194                 return 0;
1195
1196         return 1;
1197 }
1198
1199 /* Authenticate remote device */
1200 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1201 {
1202         BT_DBG("hcon %p", conn);
1203
1204         if (conn->pending_sec_level > sec_level)
1205                 sec_level = conn->pending_sec_level;
1206
1207         if (sec_level > conn->sec_level)
1208                 conn->pending_sec_level = sec_level;
1209         else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1210                 return 1;
1211
1212         /* Make sure we preserve an existing MITM requirement*/
1213         auth_type |= (conn->auth_type & 0x01);
1214
1215         conn->auth_type = auth_type;
1216
1217         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1218                 struct hci_cp_auth_requested cp;
1219
1220                 cp.handle = cpu_to_le16(conn->handle);
1221                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1222                              sizeof(cp), &cp);
1223
1224                 /* If we're already encrypted set the REAUTH_PEND flag,
1225                  * otherwise set the ENCRYPT_PEND.
1226                  */
1227                 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1228                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1229                 else
1230                         set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1231         }
1232
1233         return 0;
1234 }
1235
1236 /* Encrypt the the link */
1237 static void hci_conn_encrypt(struct hci_conn *conn)
1238 {
1239         BT_DBG("hcon %p", conn);
1240
1241         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1242                 struct hci_cp_set_conn_encrypt cp;
1243                 cp.handle  = cpu_to_le16(conn->handle);
1244                 cp.encrypt = 0x01;
1245                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1246                              &cp);
1247         }
1248 }
1249
1250 /* Enable security */
1251 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1252                       bool initiator)
1253 {
1254         BT_DBG("hcon %p", conn);
1255
1256         if (conn->type == LE_LINK)
1257                 return smp_conn_security(conn, sec_level);
1258
1259         /* For sdp we don't need the link key. */
1260         if (sec_level == BT_SECURITY_SDP)
1261                 return 1;
1262
1263         /* For non 2.1 devices and low security level we don't need the link
1264            key. */
1265         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1266                 return 1;
1267
1268         /* For other security levels we need the link key. */
1269         if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1270                 goto auth;
1271
1272         switch (conn->key_type) {
1273         case HCI_LK_AUTH_COMBINATION_P256:
1274                 /* An authenticated FIPS approved combination key has
1275                  * sufficient security for security level 4 or lower.
1276                  */
1277                 if (sec_level <= BT_SECURITY_FIPS)
1278                         goto encrypt;
1279                 break;
1280         case HCI_LK_AUTH_COMBINATION_P192:
1281                 /* An authenticated combination key has sufficient security for
1282                  * security level 3 or lower.
1283                  */
1284                 if (sec_level <= BT_SECURITY_HIGH)
1285                         goto encrypt;
1286                 break;
1287         case HCI_LK_UNAUTH_COMBINATION_P192:
1288         case HCI_LK_UNAUTH_COMBINATION_P256:
1289                 /* An unauthenticated combination key has sufficient security
1290                  * for security level 2 or lower.
1291                  */
1292                 if (sec_level <= BT_SECURITY_MEDIUM)
1293                         goto encrypt;
1294                 break;
1295         case HCI_LK_COMBINATION:
1296                 /* A combination key has always sufficient security for the
1297                  * security levels 2 or lower. High security level requires the
1298                  * combination key is generated using maximum PIN code length
1299                  * (16). For pre 2.1 units.
1300                  */
1301                 if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16)
1302                         goto encrypt;
1303                 break;
1304         default:
1305                 break;
1306         }
1307
1308 auth:
1309         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1310                 return 0;
1311
1312         if (initiator)
1313                 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1314
1315         if (!hci_conn_auth(conn, sec_level, auth_type))
1316                 return 0;
1317
1318 encrypt:
1319         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1320                 /* Ensure that the encryption key size has been read,
1321                  * otherwise stall the upper layer responses.
1322                  */
1323                 if (!conn->enc_key_size)
1324                         return 0;
1325
1326                 /* Nothing else needed, all requirements are met */
1327                 return 1;
1328         }
1329
1330         hci_conn_encrypt(conn);
1331         return 0;
1332 }
1333 EXPORT_SYMBOL(hci_conn_security);
1334
1335 /* Check secure link requirement */
1336 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1337 {
1338         BT_DBG("hcon %p", conn);
1339
1340         /* Accept if non-secure or higher security level is required */
1341         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1342                 return 1;
1343
1344         /* Accept if secure or higher security level is already present */
1345         if (conn->sec_level == BT_SECURITY_HIGH ||
1346             conn->sec_level == BT_SECURITY_FIPS)
1347                 return 1;
1348
1349         /* Reject not secure link */
1350         return 0;
1351 }
1352 EXPORT_SYMBOL(hci_conn_check_secure);
1353
1354 /* Switch role */
1355 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1356 {
1357         BT_DBG("hcon %p", conn);
1358
1359         if (role == conn->role)
1360                 return 1;
1361
1362         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1363                 struct hci_cp_switch_role cp;
1364                 bacpy(&cp.bdaddr, &conn->dst);
1365                 cp.role = role;
1366                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1367         }
1368
1369         return 0;
1370 }
1371 EXPORT_SYMBOL(hci_conn_switch_role);
1372
1373 /* Enter active mode */
1374 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1375 {
1376         struct hci_dev *hdev = conn->hdev;
1377
1378         BT_DBG("hcon %p mode %d", conn, conn->mode);
1379
1380         if (conn->mode != HCI_CM_SNIFF)
1381                 goto timer;
1382
1383         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1384                 goto timer;
1385
1386         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1387                 struct hci_cp_exit_sniff_mode cp;
1388                 cp.handle = cpu_to_le16(conn->handle);
1389                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1390         }
1391
1392 timer:
1393         if (hdev->idle_timeout > 0)
1394                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1395                                    msecs_to_jiffies(hdev->idle_timeout));
1396 }
1397
1398 /* Drop all connection on the device */
1399 void hci_conn_hash_flush(struct hci_dev *hdev)
1400 {
1401         struct hci_conn_hash *h = &hdev->conn_hash;
1402         struct hci_conn *c, *n;
1403
1404         BT_DBG("hdev %s", hdev->name);
1405
1406         list_for_each_entry_safe(c, n, &h->list, list) {
1407                 c->state = BT_CLOSED;
1408
1409                 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1410                 hci_conn_del(c);
1411         }
1412 }
1413
1414 /* Check pending connect attempts */
1415 void hci_conn_check_pending(struct hci_dev *hdev)
1416 {
1417         struct hci_conn *conn;
1418
1419         BT_DBG("hdev %s", hdev->name);
1420
1421         hci_dev_lock(hdev);
1422
1423         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1424         if (conn)
1425                 hci_acl_create_connection(conn);
1426
1427         hci_dev_unlock(hdev);
1428 }
1429
1430 static u32 get_link_mode(struct hci_conn *conn)
1431 {
1432         u32 link_mode = 0;
1433
1434         if (conn->role == HCI_ROLE_MASTER)
1435                 link_mode |= HCI_LM_MASTER;
1436
1437         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1438                 link_mode |= HCI_LM_ENCRYPT;
1439
1440         if (test_bit(HCI_CONN_AUTH, &conn->flags))
1441                 link_mode |= HCI_LM_AUTH;
1442
1443         if (test_bit(HCI_CONN_SECURE, &conn->flags))
1444                 link_mode |= HCI_LM_SECURE;
1445
1446         if (test_bit(HCI_CONN_FIPS, &conn->flags))
1447                 link_mode |= HCI_LM_FIPS;
1448
1449         return link_mode;
1450 }
1451
1452 int hci_get_conn_list(void __user *arg)
1453 {
1454         struct hci_conn *c;
1455         struct hci_conn_list_req req, *cl;
1456         struct hci_conn_info *ci;
1457         struct hci_dev *hdev;
1458         int n = 0, size, err;
1459
1460         if (copy_from_user(&req, arg, sizeof(req)))
1461                 return -EFAULT;
1462
1463         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1464                 return -EINVAL;
1465
1466         size = sizeof(req) + req.conn_num * sizeof(*ci);
1467
1468         cl = kmalloc(size, GFP_KERNEL);
1469         if (!cl)
1470                 return -ENOMEM;
1471
1472         hdev = hci_dev_get(req.dev_id);
1473         if (!hdev) {
1474                 kfree(cl);
1475                 return -ENODEV;
1476         }
1477
1478         ci = cl->conn_info;
1479
1480         hci_dev_lock(hdev);
1481         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1482                 bacpy(&(ci + n)->bdaddr, &c->dst);
1483                 (ci + n)->handle = c->handle;
1484                 (ci + n)->type  = c->type;
1485                 (ci + n)->out   = c->out;
1486                 (ci + n)->state = c->state;
1487                 (ci + n)->link_mode = get_link_mode(c);
1488                 if (++n >= req.conn_num)
1489                         break;
1490         }
1491         hci_dev_unlock(hdev);
1492
1493         cl->dev_id = hdev->id;
1494         cl->conn_num = n;
1495         size = sizeof(req) + n * sizeof(*ci);
1496
1497         hci_dev_put(hdev);
1498
1499         err = copy_to_user(arg, cl, size);
1500         kfree(cl);
1501
1502         return err ? -EFAULT : 0;
1503 }
1504
1505 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1506 {
1507         struct hci_conn_info_req req;
1508         struct hci_conn_info ci;
1509         struct hci_conn *conn;
1510         char __user *ptr = arg + sizeof(req);
1511
1512         if (copy_from_user(&req, arg, sizeof(req)))
1513                 return -EFAULT;
1514
1515         hci_dev_lock(hdev);
1516         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1517         if (conn) {
1518                 bacpy(&ci.bdaddr, &conn->dst);
1519                 ci.handle = conn->handle;
1520                 ci.type  = conn->type;
1521                 ci.out   = conn->out;
1522                 ci.state = conn->state;
1523                 ci.link_mode = get_link_mode(conn);
1524         }
1525         hci_dev_unlock(hdev);
1526
1527         if (!conn)
1528                 return -ENOENT;
1529
1530         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1531 }
1532
1533 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1534 {
1535         struct hci_auth_info_req req;
1536         struct hci_conn *conn;
1537
1538         if (copy_from_user(&req, arg, sizeof(req)))
1539                 return -EFAULT;
1540
1541         hci_dev_lock(hdev);
1542         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1543         if (conn)
1544                 req.type = conn->auth_type;
1545         hci_dev_unlock(hdev);
1546
1547         if (!conn)
1548                 return -ENOENT;
1549
1550         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1551 }
1552
1553 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1554 {
1555         struct hci_dev *hdev = conn->hdev;
1556         struct hci_chan *chan;
1557
1558         BT_DBG("%s hcon %p", hdev->name, conn);
1559
1560         if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1561                 BT_DBG("Refusing to create new hci_chan");
1562                 return NULL;
1563         }
1564
1565         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1566         if (!chan)
1567                 return NULL;
1568
1569         chan->conn = hci_conn_get(conn);
1570         skb_queue_head_init(&chan->data_q);
1571         chan->state = BT_CONNECTED;
1572
1573         list_add_rcu(&chan->list, &conn->chan_list);
1574
1575         return chan;
1576 }
1577
1578 void hci_chan_del(struct hci_chan *chan)
1579 {
1580         struct hci_conn *conn = chan->conn;
1581         struct hci_dev *hdev = conn->hdev;
1582
1583         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1584
1585         list_del_rcu(&chan->list);
1586
1587         synchronize_rcu();
1588
1589         /* Prevent new hci_chan's to be created for this hci_conn */
1590         set_bit(HCI_CONN_DROP, &conn->flags);
1591
1592         hci_conn_put(conn);
1593
1594         skb_queue_purge(&chan->data_q);
1595         kfree(chan);
1596 }
1597
1598 void hci_chan_list_flush(struct hci_conn *conn)
1599 {
1600         struct hci_chan *chan, *n;
1601
1602         BT_DBG("hcon %p", conn);
1603
1604         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1605                 hci_chan_del(chan);
1606 }
1607
1608 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1609                                                  __u16 handle)
1610 {
1611         struct hci_chan *hchan;
1612
1613         list_for_each_entry(hchan, &hcon->chan_list, list) {
1614                 if (hchan->handle == handle)
1615                         return hchan;
1616         }
1617
1618         return NULL;
1619 }
1620
1621 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1622 {
1623         struct hci_conn_hash *h = &hdev->conn_hash;
1624         struct hci_conn *hcon;
1625         struct hci_chan *hchan = NULL;
1626
1627         rcu_read_lock();
1628
1629         list_for_each_entry_rcu(hcon, &h->list, list) {
1630                 hchan = __hci_chan_lookup_handle(hcon, handle);
1631                 if (hchan)
1632                         break;
1633         }
1634
1635         rcu_read_unlock();
1636
1637         return hchan;
1638 }