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 (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
 126                 switch (conn->setting & SCO_AIRMODE_MASK) {
 127                 case SCO_AIRMODE_CVSD:
 128                 case SCO_AIRMODE_TRANSP:
 129                         if (hdev->notify)
 130                                 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
 131                         break;
 132                 }
 133         } else {
 134                 if (hdev->notify)
 135                         hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 136         }
 137
 138         hci_conn_del_sysfs(conn);
 139
 140         debugfs_remove_recursive(conn->debugfs);
 141
 142         hci_dev_put(hdev);
 143
 144         hci_conn_put(conn);
 145 }
 146
 147 static void le_scan_cleanup(struct work_struct *work)
 148 {
 149         struct hci_conn *conn = container_of(work, struct hci_conn,
 150                                              le_scan_cleanup);
 151         struct hci_dev *hdev = conn->hdev;
 152         struct hci_conn *c = NULL;
 153
 154         BT_DBG("%s hcon %p", hdev->name, conn);
 155
 156         hci_dev_lock(hdev);
 157
 158         /* Check that the hci_conn is still around */
 159         rcu_read_lock();
 160         list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
 161                 if (c == conn)
 162                         break;
 163         }
 164         rcu_read_unlock();
 165
 166         if (c == conn) {
 167                 hci_connect_le_scan_cleanup(conn);
 168                 hci_conn_cleanup(conn);
 169         }
 170
 171         hci_dev_unlock(hdev);
 172         hci_dev_put(hdev);
 173         hci_conn_put(conn);
 174 }
 175
 176 static void hci_connect_le_scan_remove(struct hci_conn *conn)
 177 {
 178         BT_DBG("%s hcon %p", conn->hdev->name, conn);
 179
 180         /* We can't call hci_conn_del/hci_conn_cleanup here since that
 181          * could deadlock with another hci_conn_del() call that's holding
 182          * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
 183          * Instead, grab temporary extra references to the hci_dev and
 184          * hci_conn and perform the necessary cleanup in a separate work
 185          * callback.
 186          */
 187
 188         hci_dev_hold(conn->hdev);
 189         hci_conn_get(conn);
 190
 191         /* Even though we hold a reference to the hdev, many other
 192          * things might get cleaned up meanwhile, including the hdev's
 193          * own workqueue, so we can't use that for scheduling.
 194          */
 195         schedule_work(&conn->le_scan_cleanup);
 196 }
 197
 198 static void hci_acl_create_connection(struct hci_conn *conn)
 199 {
 200         struct hci_dev *hdev = conn->hdev;
 201         struct inquiry_entry *ie;
 202         struct hci_cp_create_conn cp;
 203
 204         BT_DBG("hcon %p", conn);
 205
 206         /* Many controllers disallow HCI Create Connection while it is doing
 207          * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create
 208          * Connection. This may cause the MGMT discovering state to become false
 209          * without user space's request but it is okay since the MGMT Discovery
 210          * APIs do not promise that discovery should be done forever. Instead,
 211          * the user space monitors the status of MGMT discovering and it may
 212          * request for discovery again when this flag becomes false.
 213          */
 214         if (test_bit(HCI_INQUIRY, &hdev->flags)) {
 215                 /* Put this connection to "pending" state so that it will be
 216                  * executed after the inquiry cancel command complete event.
 217                  */
 218                 conn->state = BT_CONNECT2;
 219                 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL);
 220                 return;
 221         }
 222
 223         conn->state = BT_CONNECT;
 224         conn->out = true;
 225         conn->role = HCI_ROLE_MASTER;
 226
 227         conn->attempt++;
 228
 229         conn->link_policy = hdev->link_policy;
 230
 231         memset(&cp, 0, sizeof(cp));
 232         bacpy(&cp.bdaddr, &conn->dst);
 233         cp.pscan_rep_mode = 0x02;
 234
 235         ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
 236         if (ie) {
 237                 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
 238                         cp.pscan_rep_mode = ie->data.pscan_rep_mode;
 239                         cp.pscan_mode     = ie->data.pscan_mode;
 240                         cp.clock_offset   = ie->data.clock_offset |
 241                                             cpu_to_le16(0x8000);
 242                 }
 243
 244                 memcpy(conn->dev_class, ie->data.dev_class, 3);
 245         }
 246
 247         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 248         if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
 249                 cp.role_switch = 0x01;
 250         else
 251                 cp.role_switch = 0x00;
 252
 253         hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
 254 }
 255
 256 int hci_disconnect(struct hci_conn *conn, __u8 reason)
 257 {
 258         BT_DBG("hcon %p", conn);
 259
 260         /* When we are central of an established connection and it enters
 261          * the disconnect timeout, then go ahead and try to read the
 262          * current clock offset.  Processing of the result is done
 263          * within the event handling and hci_clock_offset_evt function.
 264          */
 265         if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
 266             (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
 267                 struct hci_dev *hdev = conn->hdev;
 268                 struct hci_cp_read_clock_offset clkoff_cp;
 269
 270                 clkoff_cp.handle = cpu_to_le16(conn->handle);
 271                 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
 272                              &clkoff_cp);
 273         }
 274
 275         return hci_abort_conn(conn, reason);
 276 }
 277
 278 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
 279 {
 280         struct hci_dev *hdev = conn->hdev;
 281         struct hci_cp_add_sco cp;
 282
 283         BT_DBG("hcon %p", conn);
 284
 285         conn->state = BT_CONNECT;
 286         conn->out = true;
 287
 288         conn->attempt++;
 289
 290         cp.handle   = cpu_to_le16(handle);
 291         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 292
 293         hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 294 }
 295
 296 static bool find_next_esco_param(struct hci_conn *conn,
 297                                  const struct sco_param *esco_param, int size)
 298 {
 299         for (; conn->attempt <= size; conn->attempt++) {
 300                 if (lmp_esco_2m_capable(conn->link) ||
 301                     (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
 302                         break;
 303                 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
 304                        conn, conn->attempt);
 305         }
 306
 307         return conn->attempt <= size;
 308 }
 309
 310 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
 311 {
 312         struct hci_dev *hdev = conn->hdev;
 313         struct hci_cp_setup_sync_conn cp;
 314         const struct sco_param *param;
 315
 316         BT_DBG("hcon %p", conn);
 317
 318         conn->state = BT_CONNECT;
 319         conn->out = true;
 320
 321         conn->attempt++;
 322
 323         cp.handle   = cpu_to_le16(handle);
 324
 325         cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
 326         cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
 327         cp.voice_setting  = cpu_to_le16(conn->setting);
 328
 329         switch (conn->setting & SCO_AIRMODE_MASK) {
 330         case SCO_AIRMODE_TRANSP:
 331                 if (!find_next_esco_param(conn, esco_param_msbc,
 332                                           ARRAY_SIZE(esco_param_msbc)))
 333                         return false;
 334                 param = &esco_param_msbc[conn->attempt - 1];
 335                 break;
 336         case SCO_AIRMODE_CVSD:
 337                 if (lmp_esco_capable(conn->link)) {
 338                         if (!find_next_esco_param(conn, esco_param_cvsd,
 339                                                   ARRAY_SIZE(esco_param_cvsd)))
 340                                 return false;
 341                         param = &esco_param_cvsd[conn->attempt - 1];
 342                 } else {
 343                         if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
 344                                 return false;
 345                         param = &sco_param_cvsd[conn->attempt - 1];
 346                 }
 347                 break;
 348         default:
 349                 return false;
 350         }
 351
 352         cp.retrans_effort = param->retrans_effort;
 353         cp.pkt_type = __cpu_to_le16(param->pkt_type);
 354         cp.max_latency = __cpu_to_le16(param->max_latency);
 355
 356         if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
 357                 return false;
 358
 359         return true;
 360 }
 361
 362 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
 363                       u16 to_multiplier)
 364 {
 365         struct hci_dev *hdev = conn->hdev;
 366         struct hci_conn_params *params;
 367         struct hci_cp_le_conn_update cp;
 368
 369         hci_dev_lock(hdev);
 370
 371         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 372         if (params) {
 373                 params->conn_min_interval = min;
 374                 params->conn_max_interval = max;
 375                 params->conn_latency = latency;
 376                 params->supervision_timeout = to_multiplier;
 377         }
 378
 379         hci_dev_unlock(hdev);
 380
 381         memset(&cp, 0, sizeof(cp));
 382         cp.handle               = cpu_to_le16(conn->handle);
 383         cp.conn_interval_min    = cpu_to_le16(min);
 384         cp.conn_interval_max    = cpu_to_le16(max);
 385         cp.conn_latency         = cpu_to_le16(latency);
 386         cp.supervision_timeout  = cpu_to_le16(to_multiplier);
 387         cp.min_ce_len           = cpu_to_le16(0x0000);
 388         cp.max_ce_len           = cpu_to_le16(0x0000);
 389
 390         hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
 391
 392         if (params)
 393                 return 0x01;
 394
 395         return 0x00;
 396 }
 397
 398 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
 399                       __u8 ltk[16], __u8 key_size)
 400 {
 401         struct hci_dev *hdev = conn->hdev;
 402         struct hci_cp_le_start_enc cp;
 403
 404         BT_DBG("hcon %p", conn);
 405
 406         memset(&cp, 0, sizeof(cp));
 407
 408         cp.handle = cpu_to_le16(conn->handle);
 409         cp.rand = rand;
 410         cp.ediv = ediv;
 411         memcpy(cp.ltk, ltk, key_size);
 412
 413         hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
 414 }
 415
 416 /* Device _must_ be locked */
 417 void hci_sco_setup(struct hci_conn *conn, __u8 status)
 418 {
 419         struct hci_conn *sco = conn->link;
 420
 421         if (!sco)
 422                 return;
 423
 424         BT_DBG("hcon %p", conn);
 425
 426         if (!status) {
 427                 if (lmp_esco_capable(conn->hdev))
 428                         hci_setup_sync(sco, conn->handle);
 429                 else
 430                         hci_add_sco(sco, conn->handle);
 431         } else {
 432                 hci_connect_cfm(sco, status);
 433                 hci_conn_del(sco);
 434         }
 435 }
 436
 437 static void hci_conn_timeout(struct work_struct *work)
 438 {
 439         struct hci_conn *conn = container_of(work, struct hci_conn,
 440                                              disc_work.work);
 441         int refcnt = atomic_read(&conn->refcnt);
 442
 443         BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
 444
 445         WARN_ON(refcnt < 0);
 446
 447         /* FIXME: It was observed that in pairing failed scenario, refcnt
 448          * drops below 0. Probably this is because l2cap_conn_del calls
 449          * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
 450          * dropped. After that loop hci_chan_del is called which also drops
 451          * conn. For now make sure that ACL is alive if refcnt is higher then 0,
 452          * otherwise drop it.
 453          */
 454         if (refcnt > 0)
 455                 return;
 456
 457         /* LE connections in scanning state need special handling */
 458         if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
 459             test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 460                 hci_connect_le_scan_remove(conn);
 461                 return;
 462         }
 463
 464         hci_abort_conn(conn, hci_proto_disconn_ind(conn));
 465 }
 466
 467 /* Enter sniff mode */
 468 static void hci_conn_idle(struct work_struct *work)
 469 {
 470         struct hci_conn *conn = container_of(work, struct hci_conn,
 471                                              idle_work.work);
 472         struct hci_dev *hdev = conn->hdev;
 473
 474         BT_DBG("hcon %p mode %d", conn, conn->mode);
 475
 476         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 477                 return;
 478
 479         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 480                 return;
 481
 482         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 483                 struct hci_cp_sniff_subrate cp;
 484                 cp.handle             = cpu_to_le16(conn->handle);
 485                 cp.max_latency        = cpu_to_le16(0);
 486                 cp.min_remote_timeout = cpu_to_le16(0);
 487                 cp.min_local_timeout  = cpu_to_le16(0);
 488                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 489         }
 490
 491         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 492                 struct hci_cp_sniff_mode cp;
 493                 cp.handle       = cpu_to_le16(conn->handle);
 494                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 495                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 496                 cp.attempt      = cpu_to_le16(4);
 497                 cp.timeout      = cpu_to_le16(1);
 498                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 499         }
 500 }
 501
 502 static void hci_conn_auto_accept(struct work_struct *work)
 503 {
 504         struct hci_conn *conn = container_of(work, struct hci_conn,
 505                                              auto_accept_work.work);
 506
 507         hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
 508                      &conn->dst);
 509 }
 510
 511 static void le_disable_advertising(struct hci_dev *hdev)
 512 {
 513         if (ext_adv_capable(hdev)) {
 514                 struct hci_cp_le_set_ext_adv_enable cp;
 515
 516                 cp.enable = 0x00;
 517                 cp.num_of_sets = 0x00;
 518
 519                 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
 520                              &cp);
 521         } else {
 522                 u8 enable = 0x00;
 523                 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 524                              &enable);
 525         }
 526 }
 527
 528 static void le_conn_timeout(struct work_struct *work)
 529 {
 530         struct hci_conn *conn = container_of(work, struct hci_conn,
 531                                              le_conn_timeout.work);
 532         struct hci_dev *hdev = conn->hdev;
 533
 534         BT_DBG("");
 535
 536         /* We could end up here due to having done directed advertising,
 537          * so clean up the state if necessary. This should however only
 538          * happen with broken hardware or if low duty cycle was used
 539          * (which doesn't have a timeout of its own).
 540          */
 541         if (conn->role == HCI_ROLE_SLAVE) {
 542                 /* Disable LE Advertising */
 543                 le_disable_advertising(hdev);
 544                 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
 545                 return;
 546         }
 547
 548         hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
 549 }
 550
 551 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
 552                               u8 role)
 553 {
 554         struct hci_conn *conn;
 555
 556         BT_DBG("%s dst %pMR", hdev->name, dst);
 557
 558         conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 559         if (!conn)
 560                 return NULL;
 561
 562         bacpy(&conn->dst, dst);
 563         bacpy(&conn->src, &hdev->bdaddr);
 564         conn->hdev  = hdev;
 565         conn->type  = type;
 566         conn->role  = role;
 567         conn->mode  = HCI_CM_ACTIVE;
 568         conn->state = BT_OPEN;
 569         conn->auth_type = HCI_AT_GENERAL_BONDING;
 570         conn->io_capability = hdev->io_capability;
 571         conn->remote_auth = 0xff;
 572         conn->key_type = 0xff;
 573         conn->rssi = HCI_RSSI_INVALID;
 574         conn->tx_power = HCI_TX_POWER_INVALID;
 575         conn->max_tx_power = HCI_TX_POWER_INVALID;
 576
 577         set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
 578         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 579
 580         /* Set Default Authenticated payload timeout to 30s */
 581         conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
 582
 583         if (conn->role == HCI_ROLE_MASTER)
 584                 conn->out = true;
 585
 586         switch (type) {
 587         case ACL_LINK:
 588                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 589                 break;
 590         case LE_LINK:
 591                 /* conn->src should reflect the local identity address */
 592                 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
 593                 break;
 594         case SCO_LINK:
 595                 if (lmp_esco_capable(hdev))
 596                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 597                                         (hdev->esco_type & EDR_ESCO_MASK);
 598                 else
 599                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 600                 break;
 601         case ESCO_LINK:
 602                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 603                 break;
 604         }
 605
 606         skb_queue_head_init(&conn->data_q);
 607
 608         INIT_LIST_HEAD(&conn->chan_list);
 609
 610         INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
 611         INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
 612         INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
 613         INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
 614         INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
 615
 616         atomic_set(&conn->refcnt, 0);
 617
 618         hci_dev_hold(hdev);
 619
 620         hci_conn_hash_add(hdev, conn);
 621
 622         /* The SCO and eSCO connections will only be notified when their
 623          * setup has been completed. This is different to ACL links which
 624          * can be notified right away.
 625          */
 626         if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
 627                 if (hdev->notify)
 628                         hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 629         }
 630
 631         hci_conn_init_sysfs(conn);
 632
 633         return conn;
 634 }
 635
 636 int hci_conn_del(struct hci_conn *conn)
 637 {
 638         struct hci_dev *hdev = conn->hdev;
 639
 640         BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
 641
 642         cancel_delayed_work_sync(&conn->disc_work);
 643         cancel_delayed_work_sync(&conn->auto_accept_work);
 644         cancel_delayed_work_sync(&conn->idle_work);
 645
 646         if (conn->type == ACL_LINK) {
 647                 struct hci_conn *sco = conn->link;
 648                 if (sco)
 649                         sco->link = NULL;
 650
 651                 /* Unacked frames */
 652                 hdev->acl_cnt += conn->sent;
 653         } else if (conn->type == LE_LINK) {
 654                 cancel_delayed_work(&conn->le_conn_timeout);
 655
 656                 if (hdev->le_pkts)
 657                         hdev->le_cnt += conn->sent;
 658                 else
 659                         hdev->acl_cnt += conn->sent;
 660         } else {
 661                 struct hci_conn *acl = conn->link;
 662                 if (acl) {
 663                         acl->link = NULL;
 664                         hci_conn_drop(acl);
 665                 }
 666         }
 667
 668         if (conn->amp_mgr)
 669                 amp_mgr_put(conn->amp_mgr);
 670
 671         skb_queue_purge(&conn->data_q);
 672
 673         /* Remove the connection from the list and cleanup its remaining
 674          * state. This is a separate function since for some cases like
 675          * BT_CONNECT_SCAN we *only* want the cleanup part without the
 676          * rest of hci_conn_del.
 677          */
 678         hci_conn_cleanup(conn);
 679
 680         return 0;
 681 }
 682
 683 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
 684 {
 685         int use_src = bacmp(src, BDADDR_ANY);
 686         struct hci_dev *hdev = NULL, *d;
 687
 688         BT_DBG("%pMR -> %pMR", src, dst);
 689
 690         read_lock(&hci_dev_list_lock);
 691
 692         list_for_each_entry(d, &hci_dev_list, list) {
 693                 if (!test_bit(HCI_UP, &d->flags) ||
 694                     hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
 695                     d->dev_type != HCI_PRIMARY)
 696                         continue;
 697
 698                 /* Simple routing:
 699                  *   No source address - find interface with bdaddr != dst
 700                  *   Source address    - find interface with bdaddr == src
 701                  */
 702
 703                 if (use_src) {
 704                         bdaddr_t id_addr;
 705                         u8 id_addr_type;
 706
 707                         if (src_type == BDADDR_BREDR) {
 708                                 if (!lmp_bredr_capable(d))
 709                                         continue;
 710                                 bacpy(&id_addr, &d->bdaddr);
 711                                 id_addr_type = BDADDR_BREDR;
 712                         } else {
 713                                 if (!lmp_le_capable(d))
 714                                         continue;
 715
 716                                 hci_copy_identity_address(d, &id_addr,
 717                                                           &id_addr_type);
 718
 719                                 /* Convert from HCI to three-value type */
 720                                 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
 721                                         id_addr_type = BDADDR_LE_PUBLIC;
 722                                 else
 723                                         id_addr_type = BDADDR_LE_RANDOM;
 724                         }
 725
 726                         if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
 727                                 hdev = d; break;
 728                         }
 729                 } else {
 730                         if (bacmp(&d->bdaddr, dst)) {
 731                                 hdev = d; break;
 732                         }
 733                 }
 734         }
 735
 736         if (hdev)
 737                 hdev = hci_dev_hold(hdev);
 738
 739         read_unlock(&hci_dev_list_lock);
 740         return hdev;
 741 }
 742 EXPORT_SYMBOL(hci_get_route);
 743
 744 /* This function requires the caller holds hdev->lock */
 745 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 746 {
 747         struct hci_dev *hdev = conn->hdev;
 748         struct hci_conn_params *params;
 749
 750         params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
 751                                            conn->dst_type);
 752         if (params && params->conn) {
 753                 hci_conn_drop(params->conn);
 754                 hci_conn_put(params->conn);
 755                 params->conn = NULL;
 756         }
 757
 758         conn->state = BT_CLOSED;
 759
 760         /* If the status indicates successful cancellation of
 761          * the attempt (i.e. Unknown Connection Id) there's no point of
 762          * notifying failure since we'll go back to keep trying to
 763          * connect. The only exception is explicit connect requests
 764          * where a timeout + cancel does indicate an actual failure.
 765          */
 766         if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
 767             (params && params->explicit_connect))
 768                 mgmt_connect_failed(hdev, &conn->dst, conn->type,
 769                                     conn->dst_type, status);
 770
 771         hci_connect_cfm(conn, status);
 772
 773         hci_conn_del(conn);
 774
 775         /* The suspend notifier is waiting for all devices to disconnect and an
 776          * LE connect cancel will result in an hci_le_conn_failed. Once the last
 777          * connection is deleted, we should also wake the suspend queue to
 778          * complete suspend operations.
 779          */
 780         if (list_empty(&hdev->conn_hash.list) &&
 781             test_and_clear_bit(SUSPEND_DISCONNECTING, hdev->suspend_tasks)) {
 782                 wake_up(&hdev->suspend_wait_q);
 783         }
 784
 785         /* Since we may have temporarily stopped the background scanning in
 786          * favor of connection establishment, we should restart it.
 787          */
 788         hci_update_background_scan(hdev);
 789
 790         /* Re-enable advertising in case this was a failed connection
 791          * attempt as a peripheral.
 792          */
 793         hci_req_reenable_advertising(hdev);
 794 }
 795
 796 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 797 {
 798         struct hci_conn *conn;
 799
 800         hci_dev_lock(hdev);
 801
 802         conn = hci_lookup_le_connect(hdev);
 803
 804         if (hdev->adv_instance_cnt)
 805                 hci_req_resume_adv_instances(hdev);
 806
 807         if (!status) {
 808                 hci_connect_le_scan_cleanup(conn);
 809                 goto done;
 810         }
 811
 812         bt_dev_err(hdev, "request failed to create LE connection: "
 813                    "status 0x%2.2x", status);
 814
 815         if (!conn)
 816                 goto done;
 817
 818         hci_le_conn_failed(conn, status);
 819
 820 done:
 821         hci_dev_unlock(hdev);
 822 }
 823
 824 static bool conn_use_rpa(struct hci_conn *conn)
 825 {
 826         struct hci_dev *hdev = conn->hdev;
 827
 828         return hci_dev_test_flag(hdev, HCI_PRIVACY);
 829 }
 830
 831 static void set_ext_conn_params(struct hci_conn *conn,
 832                                 struct hci_cp_le_ext_conn_param *p)
 833 {
 834         struct hci_dev *hdev = conn->hdev;
 835
 836         memset(p, 0, sizeof(*p));
 837
 838         p->scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
 839         p->scan_window = cpu_to_le16(hdev->le_scan_window_connect);
 840         p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 841         p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 842         p->conn_latency = cpu_to_le16(conn->le_conn_latency);
 843         p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 844         p->min_ce_len = cpu_to_le16(0x0000);
 845         p->max_ce_len = cpu_to_le16(0x0000);
 846 }
 847
 848 static void hci_req_add_le_create_conn(struct hci_request *req,
 849                                        struct hci_conn *conn,
 850                                        bdaddr_t *direct_rpa)
 851 {
 852         struct hci_dev *hdev = conn->hdev;
 853         u8 own_addr_type;
 854
 855         /* If direct address was provided we use it instead of current
 856          * address.
 857          */
 858         if (direct_rpa) {
 859                 if (bacmp(&req->hdev->random_addr, direct_rpa))
 860                         hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
 861                                                                 direct_rpa);
 862
 863                 /* direct address is always RPA */
 864                 own_addr_type = ADDR_LE_DEV_RANDOM;
 865         } else {
 866                 /* Update random address, but set require_privacy to false so
 867                  * that we never connect with an non-resolvable address.
 868                  */
 869                 if (hci_update_random_address(req, false, conn_use_rpa(conn),
 870                                               &own_addr_type))
 871                         return;
 872         }
 873
 874         if (use_ext_conn(hdev)) {
 875                 struct hci_cp_le_ext_create_conn *cp;
 876                 struct hci_cp_le_ext_conn_param *p;
 877                 u8 data[sizeof(*cp) + sizeof(*p) * 3];
 878                 u32 plen;
 879
 880                 cp = (void *) data;
 881                 p = (void *) cp->data;
 882
 883                 memset(cp, 0, sizeof(*cp));
 884
 885                 bacpy(&cp->peer_addr, &conn->dst);
 886                 cp->peer_addr_type = conn->dst_type;
 887                 cp->own_addr_type = own_addr_type;
 888
 889                 plen = sizeof(*cp);
 890
 891                 if (scan_1m(hdev)) {
 892                         cp->phys |= LE_SCAN_PHY_1M;
 893                         set_ext_conn_params(conn, p);
 894
 895                         p++;
 896                         plen += sizeof(*p);
 897                 }
 898
 899                 if (scan_2m(hdev)) {
 900                         cp->phys |= LE_SCAN_PHY_2M;
 901                         set_ext_conn_params(conn, p);
 902
 903                         p++;
 904                         plen += sizeof(*p);
 905                 }
 906
 907                 if (scan_coded(hdev)) {
 908                         cp->phys |= LE_SCAN_PHY_CODED;
 909                         set_ext_conn_params(conn, p);
 910
 911                         plen += sizeof(*p);
 912                 }
 913
 914                 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
 915
 916         } else {
 917                 struct hci_cp_le_create_conn cp;
 918
 919                 memset(&cp, 0, sizeof(cp));
 920
 921                 cp.scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
 922                 cp.scan_window = cpu_to_le16(hdev->le_scan_window_connect);
 923
 924                 bacpy(&cp.peer_addr, &conn->dst);
 925                 cp.peer_addr_type = conn->dst_type;
 926                 cp.own_address_type = own_addr_type;
 927                 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 928                 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 929                 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
 930                 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 931                 cp.min_ce_len = cpu_to_le16(0x0000);
 932                 cp.max_ce_len = cpu_to_le16(0x0000);
 933
 934                 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 935         }
 936
 937         conn->state = BT_CONNECT;
 938         clear_bit(HCI_CONN_SCANNING, &conn->flags);
 939 }
 940
 941 static void hci_req_directed_advertising(struct hci_request *req,
 942                                          struct hci_conn *conn)
 943 {
 944         struct hci_dev *hdev = req->hdev;
 945         u8 own_addr_type;
 946         u8 enable;
 947
 948         if (ext_adv_capable(hdev)) {
 949                 struct hci_cp_le_set_ext_adv_params cp;
 950                 bdaddr_t random_addr;
 951
 952                 /* Set require_privacy to false so that the remote device has a
 953                  * chance of identifying us.
 954                  */
 955                 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
 956                                            &own_addr_type, &random_addr) < 0)
 957                         return;
 958
 959                 memset(&cp, 0, sizeof(cp));
 960
 961                 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
 962                 cp.own_addr_type = own_addr_type;
 963                 cp.channel_map = hdev->le_adv_channel_map;
 964                 cp.tx_power = HCI_TX_POWER_INVALID;
 965                 cp.primary_phy = HCI_ADV_PHY_1M;
 966                 cp.secondary_phy = HCI_ADV_PHY_1M;
 967                 cp.handle = 0; /* Use instance 0 for directed adv */
 968                 cp.own_addr_type = own_addr_type;
 969                 cp.peer_addr_type = conn->dst_type;
 970                 bacpy(&cp.peer_addr, &conn->dst);
 971
 972                 /* As per Core Spec 5.2 Vol 2, PART E, Sec 7.8.53, for
 973                  * advertising_event_property LE_LEGACY_ADV_DIRECT_IND
 974                  * does not supports advertising data when the advertising set already
 975                  * contains some, the controller shall return erroc code 'Invalid
 976                  * HCI Command Parameters(0x12).
 977                  * So it is required to remove adv set for handle 0x00. since we use
 978                  * instance 0 for directed adv.
 979                  */
 980                 __hci_req_remove_ext_adv_instance(req, cp.handle);
 981
 982                 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
 983
 984                 if (own_addr_type == ADDR_LE_DEV_RANDOM &&
 985                     bacmp(&random_addr, BDADDR_ANY) &&
 986                     bacmp(&random_addr, &hdev->random_addr)) {
 987                         struct hci_cp_le_set_adv_set_rand_addr cp;
 988
 989                         memset(&cp, 0, sizeof(cp));
 990
 991                         cp.handle = 0;
 992                         bacpy(&cp.bdaddr, &random_addr);
 993
 994                         hci_req_add(req,
 995                                     HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
 996                                     sizeof(cp), &cp);
 997                 }
 998
 999                 __hci_req_enable_ext_advertising(req, 0x00);
1000         } else {
1001                 struct hci_cp_le_set_adv_param cp;
1002
1003                 /* Clear the HCI_LE_ADV bit temporarily so that the
1004                  * hci_update_random_address knows that it's safe to go ahead
1005                  * and write a new random address. The flag will be set back on
1006                  * as soon as the SET_ADV_ENABLE HCI command completes.
1007                  */
1008                 hci_dev_clear_flag(hdev, HCI_LE_ADV);
1009
1010                 /* Set require_privacy to false so that the remote device has a
1011                  * chance of identifying us.
1012                  */
1013                 if (hci_update_random_address(req, false, conn_use_rpa(conn),
1014                                               &own_addr_type) < 0)
1015                         return;
1016
1017                 memset(&cp, 0, sizeof(cp));
1018
1019                 /* Some controllers might reject command if intervals are not
1020                  * within range for undirected advertising.
1021                  * BCM20702A0 is known to be affected by this.
1022                  */
1023                 cp.min_interval = cpu_to_le16(0x0020);
1024                 cp.max_interval = cpu_to_le16(0x0020);
1025
1026                 cp.type = LE_ADV_DIRECT_IND;
1027                 cp.own_address_type = own_addr_type;
1028                 cp.direct_addr_type = conn->dst_type;
1029                 bacpy(&cp.direct_addr, &conn->dst);
1030                 cp.channel_map = hdev->le_adv_channel_map;
1031
1032                 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
1033
1034                 enable = 0x01;
1035                 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1036                             &enable);
1037         }
1038
1039         conn->state = BT_CONNECT;
1040 }
1041
1042 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1043                                 u8 dst_type, u8 sec_level, u16 conn_timeout,
1044                                 u8 role, bdaddr_t *direct_rpa)
1045 {
1046         struct hci_conn_params *params;
1047         struct hci_conn *conn;
1048         struct smp_irk *irk;
1049         struct hci_request req;
1050         int err;
1051
1052         /* This ensures that during disable le_scan address resolution
1053          * will not be disabled if it is followed by le_create_conn
1054          */
1055         bool rpa_le_conn = true;
1056
1057         /* Let's make sure that le is enabled.*/
1058         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1059                 if (lmp_le_capable(hdev))
1060                         return ERR_PTR(-ECONNREFUSED);
1061
1062                 return ERR_PTR(-EOPNOTSUPP);
1063         }
1064
1065         /* Since the controller supports only one LE connection attempt at a
1066          * time, we return -EBUSY if there is any connection attempt running.
1067          */
1068         if (hci_lookup_le_connect(hdev))
1069                 return ERR_PTR(-EBUSY);
1070
1071         /* If there's already a connection object but it's not in
1072          * scanning state it means it must already be established, in
1073          * which case we can't do anything else except report a failure
1074          * to connect.
1075          */
1076         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1077         if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1078                 return ERR_PTR(-EBUSY);
1079         }
1080
1081         /* When given an identity address with existing identity
1082          * resolving key, the connection needs to be established
1083          * to a resolvable random address.
1084          *
1085          * Storing the resolvable random address is required here
1086          * to handle connection failures. The address will later
1087          * be resolved back into the original identity address
1088          * from the connect request.
1089          */
1090         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1091         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1092                 dst = &irk->rpa;
1093                 dst_type = ADDR_LE_DEV_RANDOM;
1094         }
1095
1096         if (conn) {
1097                 bacpy(&conn->dst, dst);
1098         } else {
1099                 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1100                 if (!conn)
1101                         return ERR_PTR(-ENOMEM);
1102                 hci_conn_hold(conn);
1103                 conn->pending_sec_level = sec_level;
1104         }
1105
1106         conn->dst_type = dst_type;
1107         conn->sec_level = BT_SECURITY_LOW;
1108         conn->conn_timeout = conn_timeout;
1109
1110         hci_req_init(&req, hdev);
1111
1112         /* Disable advertising if we're active. For central role
1113          * connections most controllers will refuse to connect if
1114          * advertising is enabled, and for peripheral role connections we
1115          * anyway have to disable it in order to start directed
1116          * advertising. Any registered advertisements will be
1117          * re-enabled after the connection attempt is finished.
1118          */
1119         if (hci_dev_test_flag(hdev, HCI_LE_ADV))
1120                 __hci_req_pause_adv_instances(&req);
1121
1122         /* If requested to connect as peripheral use directed advertising */
1123         if (conn->role == HCI_ROLE_SLAVE) {
1124                 /* If we're active scanning most controllers are unable
1125                  * to initiate advertising. Simply reject the attempt.
1126                  */
1127                 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1128                     hdev->le_scan_type == LE_SCAN_ACTIVE) {
1129                         hci_req_purge(&req);
1130                         hci_conn_del(conn);
1131                         return ERR_PTR(-EBUSY);
1132                 }
1133
1134                 hci_req_directed_advertising(&req, conn);
1135                 goto create_conn;
1136         }
1137
1138         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1139         if (params) {
1140                 conn->le_conn_min_interval = params->conn_min_interval;
1141                 conn->le_conn_max_interval = params->conn_max_interval;
1142                 conn->le_conn_latency = params->conn_latency;
1143                 conn->le_supv_timeout = params->supervision_timeout;
1144         } else {
1145                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1146                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1147                 conn->le_conn_latency = hdev->le_conn_latency;
1148                 conn->le_supv_timeout = hdev->le_supv_timeout;
1149         }
1150
1151         /* If controller is scanning, we stop it since some controllers are
1152          * not able to scan and connect at the same time. Also set the
1153          * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1154          * handler for scan disabling knows to set the correct discovery
1155          * state.
1156          */
1157         if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1158                 hci_req_add_le_scan_disable(&req, rpa_le_conn);
1159                 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1160         }
1161
1162         hci_req_add_le_create_conn(&req, conn, direct_rpa);
1163
1164 create_conn:
1165         err = hci_req_run(&req, create_le_conn_complete);
1166         if (err) {
1167                 hci_conn_del(conn);
1168
1169                 if (hdev->adv_instance_cnt)
1170                         hci_req_resume_adv_instances(hdev);
1171
1172                 return ERR_PTR(err);
1173         }
1174
1175         return conn;
1176 }
1177
1178 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1179 {
1180         struct hci_conn *conn;
1181
1182         conn = hci_conn_hash_lookup_le(hdev, addr, type);
1183         if (!conn)
1184                 return false;
1185
1186         if (conn->state != BT_CONNECTED)
1187                 return false;
1188
1189         return true;
1190 }
1191
1192 /* This function requires the caller holds hdev->lock */
1193 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1194                                         bdaddr_t *addr, u8 addr_type)
1195 {
1196         struct hci_conn_params *params;
1197
1198         if (is_connected(hdev, addr, addr_type))
1199                 return -EISCONN;
1200
1201         params = hci_conn_params_lookup(hdev, addr, addr_type);
1202         if (!params) {
1203                 params = hci_conn_params_add(hdev, addr, addr_type);
1204                 if (!params)
1205                         return -ENOMEM;
1206
1207                 /* If we created new params, mark them to be deleted in
1208                  * hci_connect_le_scan_cleanup. It's different case than
1209                  * existing disabled params, those will stay after cleanup.
1210                  */
1211                 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1212         }
1213
1214         /* We're trying to connect, so make sure params are at pend_le_conns */
1215         if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1216             params->auto_connect == HCI_AUTO_CONN_REPORT ||
1217             params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1218                 list_del_init(&params->action);
1219                 list_add(&params->action, &hdev->pend_le_conns);
1220         }
1221
1222         params->explicit_connect = true;
1223
1224         BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1225                params->auto_connect);
1226
1227         return 0;
1228 }
1229
1230 /* This function requires the caller holds hdev->lock */
1231 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1232                                      u8 dst_type, u8 sec_level,
1233                                      u16 conn_timeout,
1234                                      enum conn_reasons conn_reason)
1235 {
1236         struct hci_conn *conn;
1237
1238         /* Let's make sure that le is enabled.*/
1239         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1240                 if (lmp_le_capable(hdev))
1241                         return ERR_PTR(-ECONNREFUSED);
1242
1243                 return ERR_PTR(-EOPNOTSUPP);
1244         }
1245
1246         /* Some devices send ATT messages as soon as the physical link is
1247          * established. To be able to handle these ATT messages, the user-
1248          * space first establishes the connection and then starts the pairing
1249          * process.
1250          *
1251          * So if a hci_conn object already exists for the following connection
1252          * attempt, we simply update pending_sec_level and auth_type fields
1253          * and return the object found.
1254          */
1255         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1256         if (conn) {
1257                 if (conn->pending_sec_level < sec_level)
1258                         conn->pending_sec_level = sec_level;
1259                 goto done;
1260         }
1261
1262         BT_DBG("requesting refresh of dst_addr");
1263
1264         conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1265         if (!conn)
1266                 return ERR_PTR(-ENOMEM);
1267
1268         if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1269                 hci_conn_del(conn);
1270                 return ERR_PTR(-EBUSY);
1271         }
1272
1273         conn->state = BT_CONNECT;
1274         set_bit(HCI_CONN_SCANNING, &conn->flags);
1275         conn->dst_type = dst_type;
1276         conn->sec_level = BT_SECURITY_LOW;
1277         conn->pending_sec_level = sec_level;
1278         conn->conn_timeout = conn_timeout;
1279         conn->conn_reason = conn_reason;
1280
1281         hci_update_background_scan(hdev);
1282
1283 done:
1284         hci_conn_hold(conn);
1285         return conn;
1286 }
1287
1288 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1289                                  u8 sec_level, u8 auth_type,
1290                                  enum conn_reasons conn_reason)
1291 {
1292         struct hci_conn *acl;
1293
1294         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1295                 if (lmp_bredr_capable(hdev))
1296                         return ERR_PTR(-ECONNREFUSED);
1297
1298                 return ERR_PTR(-EOPNOTSUPP);
1299         }
1300
1301         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1302         if (!acl) {
1303                 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1304                 if (!acl)
1305                         return ERR_PTR(-ENOMEM);
1306         }
1307
1308         hci_conn_hold(acl);
1309
1310         acl->conn_reason = conn_reason;
1311         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1312                 acl->sec_level = BT_SECURITY_LOW;
1313                 acl->pending_sec_level = sec_level;
1314                 acl->auth_type = auth_type;
1315                 hci_acl_create_connection(acl);
1316         }
1317
1318         return acl;
1319 }
1320
1321 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1322                                  __u16 setting)
1323 {
1324         struct hci_conn *acl;
1325         struct hci_conn *sco;
1326
1327         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1328                               CONN_REASON_SCO_CONNECT);
1329         if (IS_ERR(acl))
1330                 return acl;
1331
1332         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1333         if (!sco) {
1334                 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1335                 if (!sco) {
1336                         hci_conn_drop(acl);
1337                         return ERR_PTR(-ENOMEM);
1338                 }
1339         }
1340
1341         acl->link = sco;
1342         sco->link = acl;
1343
1344         hci_conn_hold(sco);
1345
1346         sco->setting = setting;
1347
1348         if (acl->state == BT_CONNECTED &&
1349             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1350                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1351                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1352
1353                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1354                         /* defer SCO setup until mode change completed */
1355                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1356                         return sco;
1357                 }
1358
1359                 hci_sco_setup(acl, 0x00);
1360         }
1361
1362         return sco;
1363 }
1364
1365 /* Check link security requirement */
1366 int hci_conn_check_link_mode(struct hci_conn *conn)
1367 {
1368         BT_DBG("hcon %p", conn);
1369
1370         /* In Secure Connections Only mode, it is required that Secure
1371          * Connections is used and the link is encrypted with AES-CCM
1372          * using a P-256 authenticated combination key.
1373          */
1374         if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1375                 if (!hci_conn_sc_enabled(conn) ||
1376                     !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1377                     conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1378                         return 0;
1379         }
1380
1381          /* AES encryption is required for Level 4:
1382           *
1383           * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
1384           * page 1319:
1385           *
1386           * 128-bit equivalent strength for link and encryption keys
1387           * required using FIPS approved algorithms (E0 not allowed,
1388           * SAFER+ not allowed, and P-192 not allowed; encryption key
1389           * not shortened)
1390           */
1391         if (conn->sec_level == BT_SECURITY_FIPS &&
1392             !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
1393                 bt_dev_err(conn->hdev,
1394                            "Invalid security: Missing AES-CCM usage");
1395                 return 0;
1396         }
1397
1398         if (hci_conn_ssp_enabled(conn) &&
1399             !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1400                 return 0;
1401
1402         return 1;
1403 }
1404
1405 /* Authenticate remote device */
1406 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1407 {
1408         BT_DBG("hcon %p", conn);
1409
1410         if (conn->pending_sec_level > sec_level)
1411                 sec_level = conn->pending_sec_level;
1412
1413         if (sec_level > conn->sec_level)
1414                 conn->pending_sec_level = sec_level;
1415         else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1416                 return 1;
1417
1418         /* Make sure we preserve an existing MITM requirement*/
1419         auth_type |= (conn->auth_type & 0x01);
1420
1421         conn->auth_type = auth_type;
1422
1423         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1424                 struct hci_cp_auth_requested cp;
1425
1426                 cp.handle = cpu_to_le16(conn->handle);
1427                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1428                              sizeof(cp), &cp);
1429
1430                 /* If we're already encrypted set the REAUTH_PEND flag,
1431                  * otherwise set the ENCRYPT_PEND.
1432                  */
1433                 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1434                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1435                 else
1436                         set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1437         }
1438
1439         return 0;
1440 }
1441
1442 /* Encrypt the link */
1443 static void hci_conn_encrypt(struct hci_conn *conn)
1444 {
1445         BT_DBG("hcon %p", conn);
1446
1447         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1448                 struct hci_cp_set_conn_encrypt cp;
1449                 cp.handle  = cpu_to_le16(conn->handle);
1450                 cp.encrypt = 0x01;
1451                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1452                              &cp);
1453         }
1454 }
1455
1456 /* Enable security */
1457 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1458                       bool initiator)
1459 {
1460         BT_DBG("hcon %p", conn);
1461
1462         if (conn->type == LE_LINK)
1463                 return smp_conn_security(conn, sec_level);
1464
1465         /* For sdp we don't need the link key. */
1466         if (sec_level == BT_SECURITY_SDP)
1467                 return 1;
1468
1469         /* For non 2.1 devices and low security level we don't need the link
1470            key. */
1471         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1472                 return 1;
1473
1474         /* For other security levels we need the link key. */
1475         if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1476                 goto auth;
1477
1478         /* An authenticated FIPS approved combination key has sufficient
1479          * security for security level 4. */
1480         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1481             sec_level == BT_SECURITY_FIPS)
1482                 goto encrypt;
1483
1484         /* An authenticated combination key has sufficient security for
1485            security level 3. */
1486         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1487              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1488             sec_level == BT_SECURITY_HIGH)
1489                 goto encrypt;
1490
1491         /* An unauthenticated combination key has sufficient security for
1492            security level 1 and 2. */
1493         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1494              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1495             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1496                 goto encrypt;
1497
1498         /* A combination key has always sufficient security for the security
1499            levels 1 or 2. High security level requires the combination key
1500            is generated using maximum PIN code length (16).
1501            For pre 2.1 units. */
1502         if (conn->key_type == HCI_LK_COMBINATION &&
1503             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1504              conn->pin_length == 16))
1505                 goto encrypt;
1506
1507 auth:
1508         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1509                 return 0;
1510
1511         if (initiator)
1512                 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1513
1514         if (!hci_conn_auth(conn, sec_level, auth_type))
1515                 return 0;
1516
1517 encrypt:
1518         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1519                 /* Ensure that the encryption key size has been read,
1520                  * otherwise stall the upper layer responses.
1521                  */
1522                 if (!conn->enc_key_size)
1523                         return 0;
1524
1525                 /* Nothing else needed, all requirements are met */
1526                 return 1;
1527         }
1528
1529         hci_conn_encrypt(conn);
1530         return 0;
1531 }
1532 EXPORT_SYMBOL(hci_conn_security);
1533
1534 /* Check secure link requirement */
1535 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1536 {
1537         BT_DBG("hcon %p", conn);
1538
1539         /* Accept if non-secure or higher security level is required */
1540         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1541                 return 1;
1542
1543         /* Accept if secure or higher security level is already present */
1544         if (conn->sec_level == BT_SECURITY_HIGH ||
1545             conn->sec_level == BT_SECURITY_FIPS)
1546                 return 1;
1547
1548         /* Reject not secure link */
1549         return 0;
1550 }
1551 EXPORT_SYMBOL(hci_conn_check_secure);
1552
1553 /* Switch role */
1554 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1555 {
1556         BT_DBG("hcon %p", conn);
1557
1558         if (role == conn->role)
1559                 return 1;
1560
1561         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1562                 struct hci_cp_switch_role cp;
1563                 bacpy(&cp.bdaddr, &conn->dst);
1564                 cp.role = role;
1565                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1566         }
1567
1568         return 0;
1569 }
1570 EXPORT_SYMBOL(hci_conn_switch_role);
1571
1572 /* Enter active mode */
1573 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1574 {
1575         struct hci_dev *hdev = conn->hdev;
1576
1577         BT_DBG("hcon %p mode %d", conn, conn->mode);
1578
1579         if (conn->mode != HCI_CM_SNIFF)
1580                 goto timer;
1581
1582         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1583                 goto timer;
1584
1585         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1586                 struct hci_cp_exit_sniff_mode cp;
1587                 cp.handle = cpu_to_le16(conn->handle);
1588                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1589         }
1590
1591 timer:
1592         if (hdev->idle_timeout > 0)
1593                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1594                                    msecs_to_jiffies(hdev->idle_timeout));
1595 }
1596
1597 /* Drop all connection on the device */
1598 void hci_conn_hash_flush(struct hci_dev *hdev)
1599 {
1600         struct hci_conn_hash *h = &hdev->conn_hash;
1601         struct hci_conn *c, *n;
1602
1603         BT_DBG("hdev %s", hdev->name);
1604
1605         list_for_each_entry_safe(c, n, &h->list, list) {
1606                 c->state = BT_CLOSED;
1607
1608                 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1609                 hci_conn_del(c);
1610         }
1611 }
1612
1613 /* Check pending connect attempts */
1614 void hci_conn_check_pending(struct hci_dev *hdev)
1615 {
1616         struct hci_conn *conn;
1617
1618         BT_DBG("hdev %s", hdev->name);
1619
1620         hci_dev_lock(hdev);
1621
1622         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1623         if (conn)
1624                 hci_acl_create_connection(conn);
1625
1626         hci_dev_unlock(hdev);
1627 }
1628
1629 static u32 get_link_mode(struct hci_conn *conn)
1630 {
1631         u32 link_mode = 0;
1632
1633         if (conn->role == HCI_ROLE_MASTER)
1634                 link_mode |= HCI_LM_MASTER;
1635
1636         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1637                 link_mode |= HCI_LM_ENCRYPT;
1638
1639         if (test_bit(HCI_CONN_AUTH, &conn->flags))
1640                 link_mode |= HCI_LM_AUTH;
1641
1642         if (test_bit(HCI_CONN_SECURE, &conn->flags))
1643                 link_mode |= HCI_LM_SECURE;
1644
1645         if (test_bit(HCI_CONN_FIPS, &conn->flags))
1646                 link_mode |= HCI_LM_FIPS;
1647
1648         return link_mode;
1649 }
1650
1651 int hci_get_conn_list(void __user *arg)
1652 {
1653         struct hci_conn *c;
1654         struct hci_conn_list_req req, *cl;
1655         struct hci_conn_info *ci;
1656         struct hci_dev *hdev;
1657         int n = 0, size, err;
1658
1659         if (copy_from_user(&req, arg, sizeof(req)))
1660                 return -EFAULT;
1661
1662         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1663                 return -EINVAL;
1664
1665         size = sizeof(req) + req.conn_num * sizeof(*ci);
1666
1667         cl = kmalloc(size, GFP_KERNEL);
1668         if (!cl)
1669                 return -ENOMEM;
1670
1671         hdev = hci_dev_get(req.dev_id);
1672         if (!hdev) {
1673                 kfree(cl);
1674                 return -ENODEV;
1675         }
1676
1677         ci = cl->conn_info;
1678
1679         hci_dev_lock(hdev);
1680         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1681                 bacpy(&(ci + n)->bdaddr, &c->dst);
1682                 (ci + n)->handle = c->handle;
1683                 (ci + n)->type  = c->type;
1684                 (ci + n)->out   = c->out;
1685                 (ci + n)->state = c->state;
1686                 (ci + n)->link_mode = get_link_mode(c);
1687                 if (++n >= req.conn_num)
1688                         break;
1689         }
1690         hci_dev_unlock(hdev);
1691
1692         cl->dev_id = hdev->id;
1693         cl->conn_num = n;
1694         size = sizeof(req) + n * sizeof(*ci);
1695
1696         hci_dev_put(hdev);
1697
1698         err = copy_to_user(arg, cl, size);
1699         kfree(cl);
1700
1701         return err ? -EFAULT : 0;
1702 }
1703
1704 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1705 {
1706         struct hci_conn_info_req req;
1707         struct hci_conn_info ci;
1708         struct hci_conn *conn;
1709         char __user *ptr = arg + sizeof(req);
1710
1711         if (copy_from_user(&req, arg, sizeof(req)))
1712                 return -EFAULT;
1713
1714         hci_dev_lock(hdev);
1715         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1716         if (conn) {
1717                 bacpy(&ci.bdaddr, &conn->dst);
1718                 ci.handle = conn->handle;
1719                 ci.type  = conn->type;
1720                 ci.out   = conn->out;
1721                 ci.state = conn->state;
1722                 ci.link_mode = get_link_mode(conn);
1723         }
1724         hci_dev_unlock(hdev);
1725
1726         if (!conn)
1727                 return -ENOENT;
1728
1729         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1730 }
1731
1732 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1733 {
1734         struct hci_auth_info_req req;
1735         struct hci_conn *conn;
1736
1737         if (copy_from_user(&req, arg, sizeof(req)))
1738                 return -EFAULT;
1739
1740         hci_dev_lock(hdev);
1741         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1742         if (conn)
1743                 req.type = conn->auth_type;
1744         hci_dev_unlock(hdev);
1745
1746         if (!conn)
1747                 return -ENOENT;
1748
1749         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1750 }
1751
1752 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1753 {
1754         struct hci_dev *hdev = conn->hdev;
1755         struct hci_chan *chan;
1756
1757         BT_DBG("%s hcon %p", hdev->name, conn);
1758
1759         if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1760                 BT_DBG("Refusing to create new hci_chan");
1761                 return NULL;
1762         }
1763
1764         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1765         if (!chan)
1766                 return NULL;
1767
1768         chan->conn = hci_conn_get(conn);
1769         skb_queue_head_init(&chan->data_q);
1770         chan->state = BT_CONNECTED;
1771
1772         list_add_rcu(&chan->list, &conn->chan_list);
1773
1774         return chan;
1775 }
1776
1777 void hci_chan_del(struct hci_chan *chan)
1778 {
1779         struct hci_conn *conn = chan->conn;
1780         struct hci_dev *hdev = conn->hdev;
1781
1782         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1783
1784         list_del_rcu(&chan->list);
1785
1786         synchronize_rcu();
1787
1788         /* Prevent new hci_chan's to be created for this hci_conn */
1789         set_bit(HCI_CONN_DROP, &conn->flags);
1790
1791         hci_conn_put(conn);
1792
1793         skb_queue_purge(&chan->data_q);
1794         kfree(chan);
1795 }
1796
1797 void hci_chan_list_flush(struct hci_conn *conn)
1798 {
1799         struct hci_chan *chan, *n;
1800
1801         BT_DBG("hcon %p", conn);
1802
1803         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1804                 hci_chan_del(chan);
1805 }
1806
1807 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1808                                                  __u16 handle)
1809 {
1810         struct hci_chan *hchan;
1811
1812         list_for_each_entry(hchan, &hcon->chan_list, list) {
1813                 if (hchan->handle == handle)
1814                         return hchan;
1815         }
1816
1817         return NULL;
1818 }
1819
1820 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1821 {
1822         struct hci_conn_hash *h = &hdev->conn_hash;
1823         struct hci_conn *hcon;
1824         struct hci_chan *hchan = NULL;
1825
1826         rcu_read_lock();
1827
1828         list_for_each_entry_rcu(hcon, &h->list, list) {
1829                 hchan = __hci_chan_lookup_handle(hcon, handle);
1830                 if (hchan)
1831                         break;
1832         }
1833
1834         rcu_read_unlock();
1835
1836         return hchan;
1837 }
1838
1839 u32 hci_conn_get_phy(struct hci_conn *conn)
1840 {
1841         u32 phys = 0;
1842
1843         /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
1844          * Table 6.2: Packets defined for synchronous, asynchronous, and
1845          * CPB logical transport types.
1846          */
1847         switch (conn->type) {
1848         case SCO_LINK:
1849                 /* SCO logical transport (1 Mb/s):
1850                  * HV1, HV2, HV3 and DV.
1851                  */
1852                 phys |= BT_PHY_BR_1M_1SLOT;
1853
1854                 break;
1855
1856         case ACL_LINK:
1857                 /* ACL logical transport (1 Mb/s) ptt=0:
1858                  * DH1, DM3, DH3, DM5 and DH5.
1859                  */
1860                 phys |= BT_PHY_BR_1M_1SLOT;
1861
1862                 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
1863                         phys |= BT_PHY_BR_1M_3SLOT;
1864
1865                 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
1866                         phys |= BT_PHY_BR_1M_5SLOT;
1867
1868                 /* ACL logical transport (2 Mb/s) ptt=1:
1869                  * 2-DH1, 2-DH3 and 2-DH5.
1870                  */
1871                 if (!(conn->pkt_type & HCI_2DH1))
1872                         phys |= BT_PHY_EDR_2M_1SLOT;
1873
1874                 if (!(conn->pkt_type & HCI_2DH3))
1875                         phys |= BT_PHY_EDR_2M_3SLOT;
1876
1877                 if (!(conn->pkt_type & HCI_2DH5))
1878                         phys |= BT_PHY_EDR_2M_5SLOT;
1879
1880                 /* ACL logical transport (3 Mb/s) ptt=1:
1881                  * 3-DH1, 3-DH3 and 3-DH5.
1882                  */
1883                 if (!(conn->pkt_type & HCI_3DH1))
1884                         phys |= BT_PHY_EDR_3M_1SLOT;
1885
1886                 if (!(conn->pkt_type & HCI_3DH3))
1887                         phys |= BT_PHY_EDR_3M_3SLOT;
1888
1889                 if (!(conn->pkt_type & HCI_3DH5))
1890                         phys |= BT_PHY_EDR_3M_5SLOT;
1891
1892                 break;
1893
1894         case ESCO_LINK:
1895                 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
1896                 phys |= BT_PHY_BR_1M_1SLOT;
1897
1898                 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
1899                         phys |= BT_PHY_BR_1M_3SLOT;
1900
1901                 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
1902                 if (!(conn->pkt_type & ESCO_2EV3))
1903                         phys |= BT_PHY_EDR_2M_1SLOT;
1904
1905                 if (!(conn->pkt_type & ESCO_2EV5))
1906                         phys |= BT_PHY_EDR_2M_3SLOT;
1907
1908                 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
1909                 if (!(conn->pkt_type & ESCO_3EV3))
1910                         phys |= BT_PHY_EDR_3M_1SLOT;
1911
1912                 if (!(conn->pkt_type & ESCO_3EV5))
1913                         phys |= BT_PHY_EDR_3M_3SLOT;
1914
1915                 break;
1916
1917         case LE_LINK:
1918                 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
1919                         phys |= BT_PHY_LE_1M_TX;
1920
1921                 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
1922                         phys |= BT_PHY_LE_1M_RX;
1923
1924                 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
1925                         phys |= BT_PHY_LE_2M_TX;
1926
1927                 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
1928                         phys |= BT_PHY_LE_2M_RX;
1929
1930                 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
1931                         phys |= BT_PHY_LE_CODED_TX;
1932
1933                 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
1934                         phys |= BT_PHY_LE_CODED_RX;
1935
1936                 break;
1937         }
1938
1939         return phys;
1940 }