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 #ifdef TIZEN_BT
  45 static const struct sco_param esco_param_cvsd[] = {
  46         { (EDR_ESCO_MASK & ~ESCO_2EV3) | SCO_ESCO_MASK | ESCO_EV3,
  47                                       0x000a,   0x01 }, /* S3 */
  48         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007,   0x01 }, /* S2 */
  49         { EDR_ESCO_MASK | ESCO_EV3,   0x0007,   0x01 }, /* S1 */
  50         { EDR_ESCO_MASK | ESCO_HV3,   0xffff,   0x01 }, /* D1 */
  51         { EDR_ESCO_MASK | ESCO_HV1,   0xffff,   0x01 }, /* D0 */
  52 };
  53 #else
  54 static const struct sco_param esco_param_cvsd[] = {
  55         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a,   0x01 }, /* S3 */
  56         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007,   0x01 }, /* S2 */
  57         { EDR_ESCO_MASK | ESCO_EV3,   0x0007,   0x01 }, /* S1 */
  58         { EDR_ESCO_MASK | ESCO_HV3,   0xffff,   0x01 }, /* D1 */
  59         { EDR_ESCO_MASK | ESCO_HV1,   0xffff,   0x01 }, /* D0 */
  60 };
  61 #endif
  62
  63 static const struct sco_param sco_param_cvsd[] = {
  64         { EDR_ESCO_MASK | ESCO_HV3,   0xffff,   0xff }, /* D1 */
  65         { EDR_ESCO_MASK | ESCO_HV1,   0xffff,   0xff }, /* D0 */
  66 };
  67
  68 #ifdef TIZEN_BT
  69 static const struct sco_param esco_param_msbc[] = {
  70         { (EDR_ESCO_MASK & ~ESCO_2EV3) | ESCO_EV3,
  71                                       0x000d,   0x02 }, /* T2 */
  72         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d,   0x02 }, /* T2 */
  73 };
  74 #else
  75 static const struct sco_param esco_param_msbc[] = {
  76         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d,   0x02 }, /* T2 */
  77         { EDR_ESCO_MASK | ESCO_EV3,   0x0008,   0x02 }, /* T1 */
  78 };
  79 #endif
  80
  81 /* This function requires the caller holds hdev->lock */
  82 static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
  83 {
  84         struct hci_conn_params *params;
  85         struct hci_dev *hdev = conn->hdev;
  86         struct smp_irk *irk;
  87         bdaddr_t *bdaddr;
  88         u8 bdaddr_type;
  89
  90         bdaddr = &conn->dst;
  91         bdaddr_type = conn->dst_type;
  92
  93         /* Check if we need to convert to identity address */
  94         irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
  95         if (irk) {
  96                 bdaddr = &irk->bdaddr;
  97                 bdaddr_type = irk->addr_type;
  98         }
  99
 100         params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
 101                                            bdaddr_type);
 102         if (!params || !params->explicit_connect)
 103                 return;
 104
 105         /* The connection attempt was doing scan for new RPA, and is
 106          * in scan phase. If params are not associated with any other
 107          * autoconnect action, remove them completely. If they are, just unmark
 108          * them as waiting for connection, by clearing explicit_connect field.
 109          */
 110         params->explicit_connect = false;
 111
 112         list_del_init(&params->action);
 113
 114         switch (params->auto_connect) {
 115         case HCI_AUTO_CONN_EXPLICIT:
 116                 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
 117                 /* return instead of break to avoid duplicate scan update */
 118                 return;
 119         case HCI_AUTO_CONN_DIRECT:
 120         case HCI_AUTO_CONN_ALWAYS:
 121                 list_add(&params->action, &hdev->pend_le_conns);
 122                 break;
 123         case HCI_AUTO_CONN_REPORT:
 124                 list_add(&params->action, &hdev->pend_le_reports);
 125                 break;
 126         default:
 127                 break;
 128         }
 129
 130         hci_update_background_scan(hdev);
 131 }
 132
 133 static void hci_conn_cleanup(struct hci_conn *conn)
 134 {
 135         struct hci_dev *hdev = conn->hdev;
 136
 137         if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
 138                 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
 139
 140         hci_chan_list_flush(conn);
 141
 142         hci_conn_hash_del(hdev, conn);
 143
 144         if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
 145                 switch (conn->setting & SCO_AIRMODE_MASK) {
 146                 case SCO_AIRMODE_CVSD:
 147                 case SCO_AIRMODE_TRANSP:
 148                         if (hdev->notify)
 149                                 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
 150                         break;
 151                 }
 152         } else {
 153                 if (hdev->notify)
 154                         hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 155         }
 156
 157         hci_conn_del_sysfs(conn);
 158
 159         debugfs_remove_recursive(conn->debugfs);
 160
 161         hci_dev_put(hdev);
 162
 163         hci_conn_put(conn);
 164 }
 165
 166 static void le_scan_cleanup(struct work_struct *work)
 167 {
 168         struct hci_conn *conn = container_of(work, struct hci_conn,
 169                                              le_scan_cleanup);
 170         struct hci_dev *hdev = conn->hdev;
 171         struct hci_conn *c = NULL;
 172
 173         BT_DBG("%s hcon %p", hdev->name, conn);
 174
 175         hci_dev_lock(hdev);
 176
 177         /* Check that the hci_conn is still around */
 178         rcu_read_lock();
 179         list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
 180                 if (c == conn)
 181                         break;
 182         }
 183         rcu_read_unlock();
 184
 185         if (c == conn) {
 186                 hci_connect_le_scan_cleanup(conn);
 187                 hci_conn_cleanup(conn);
 188         }
 189
 190         hci_dev_unlock(hdev);
 191         hci_dev_put(hdev);
 192         hci_conn_put(conn);
 193 }
 194
 195 static void hci_connect_le_scan_remove(struct hci_conn *conn)
 196 {
 197         BT_DBG("%s hcon %p", conn->hdev->name, conn);
 198
 199         /* We can't call hci_conn_del/hci_conn_cleanup here since that
 200          * could deadlock with another hci_conn_del() call that's holding
 201          * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
 202          * Instead, grab temporary extra references to the hci_dev and
 203          * hci_conn and perform the necessary cleanup in a separate work
 204          * callback.
 205          */
 206
 207         hci_dev_hold(conn->hdev);
 208         hci_conn_get(conn);
 209
 210         /* Even though we hold a reference to the hdev, many other
 211          * things might get cleaned up meanwhile, including the hdev's
 212          * own workqueue, so we can't use that for scheduling.
 213          */
 214         schedule_work(&conn->le_scan_cleanup);
 215 }
 216
 217 static void hci_acl_create_connection(struct hci_conn *conn)
 218 {
 219         struct hci_dev *hdev = conn->hdev;
 220         struct inquiry_entry *ie;
 221         struct hci_cp_create_conn cp;
 222
 223         BT_DBG("hcon %p", conn);
 224
 225         /* Many controllers disallow HCI Create Connection while it is doing
 226          * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create
 227          * Connection. This may cause the MGMT discovering state to become false
 228          * without user space's request but it is okay since the MGMT Discovery
 229          * APIs do not promise that discovery should be done forever. Instead,
 230          * the user space monitors the status of MGMT discovering and it may
 231          * request for discovery again when this flag becomes false.
 232          */
 233         if (test_bit(HCI_INQUIRY, &hdev->flags)) {
 234                 /* Put this connection to "pending" state so that it will be
 235                  * executed after the inquiry cancel command complete event.
 236                  */
 237                 conn->state = BT_CONNECT2;
 238                 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL);
 239                 return;
 240         }
 241
 242         conn->state = BT_CONNECT;
 243         conn->out = true;
 244         conn->role = HCI_ROLE_MASTER;
 245
 246         conn->attempt++;
 247
 248         conn->link_policy = hdev->link_policy;
 249
 250         memset(&cp, 0, sizeof(cp));
 251         bacpy(&cp.bdaddr, &conn->dst);
 252         cp.pscan_rep_mode = 0x02;
 253
 254         ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
 255         if (ie) {
 256                 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
 257                         cp.pscan_rep_mode = ie->data.pscan_rep_mode;
 258                         cp.pscan_mode     = ie->data.pscan_mode;
 259                         cp.clock_offset   = ie->data.clock_offset |
 260                                             cpu_to_le16(0x8000);
 261                 }
 262
 263                 memcpy(conn->dev_class, ie->data.dev_class, 3);
 264         }
 265
 266         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 267         if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
 268                 cp.role_switch = 0x01;
 269         else
 270                 cp.role_switch = 0x00;
 271
 272         hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
 273 }
 274
 275 int hci_disconnect(struct hci_conn *conn, __u8 reason)
 276 {
 277         BT_DBG("hcon %p", conn);
 278
 279         /* When we are central of an established connection and it enters
 280          * the disconnect timeout, then go ahead and try to read the
 281          * current clock offset.  Processing of the result is done
 282          * within the event handling and hci_clock_offset_evt function.
 283          */
 284         if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
 285             (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
 286                 struct hci_dev *hdev = conn->hdev;
 287                 struct hci_cp_read_clock_offset clkoff_cp;
 288
 289                 clkoff_cp.handle = cpu_to_le16(conn->handle);
 290                 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
 291                              &clkoff_cp);
 292         }
 293
 294         return hci_abort_conn(conn, reason);
 295 }
 296
 297 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
 298 {
 299         struct hci_dev *hdev = conn->hdev;
 300         struct hci_cp_add_sco cp;
 301
 302         BT_DBG("hcon %p", conn);
 303
 304         conn->state = BT_CONNECT;
 305         conn->out = true;
 306
 307         conn->attempt++;
 308
 309         cp.handle   = cpu_to_le16(handle);
 310         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 311
 312         hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 313 }
 314
 315 static bool find_next_esco_param(struct hci_conn *conn,
 316                                  const struct sco_param *esco_param, int size)
 317 {
 318         for (; conn->attempt <= size; conn->attempt++) {
 319                 if (lmp_esco_2m_capable(conn->link) ||
 320                     (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
 321                         break;
 322                 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
 323                        conn, conn->attempt);
 324         }
 325
 326         return conn->attempt <= size;
 327 }
 328
 329 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
 330 {
 331         struct hci_dev *hdev = conn->hdev;
 332         struct hci_cp_setup_sync_conn cp;
 333         const struct sco_param *param;
 334
 335         BT_DBG("hcon %p", conn);
 336
 337         conn->state = BT_CONNECT;
 338         conn->out = true;
 339
 340         conn->attempt++;
 341
 342         cp.handle   = cpu_to_le16(handle);
 343
 344         cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
 345         cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
 346         cp.voice_setting  = cpu_to_le16(conn->setting);
 347
 348         switch (conn->setting & SCO_AIRMODE_MASK) {
 349         case SCO_AIRMODE_TRANSP:
 350                 if (!find_next_esco_param(conn, esco_param_msbc,
 351                                           ARRAY_SIZE(esco_param_msbc)))
 352                         return false;
 353                 param = &esco_param_msbc[conn->attempt - 1];
 354                 break;
 355         case SCO_AIRMODE_CVSD:
 356                 if (lmp_esco_capable(conn->link)) {
 357                         if (!find_next_esco_param(conn, esco_param_cvsd,
 358                                                   ARRAY_SIZE(esco_param_cvsd)))
 359                                 return false;
 360                         param = &esco_param_cvsd[conn->attempt - 1];
 361                 } else {
 362                         if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
 363                                 return false;
 364                         param = &sco_param_cvsd[conn->attempt - 1];
 365                 }
 366                 break;
 367         default:
 368                 return false;
 369         }
 370
 371         cp.retrans_effort = param->retrans_effort;
 372         cp.pkt_type = __cpu_to_le16(param->pkt_type);
 373         cp.max_latency = __cpu_to_le16(param->max_latency);
 374
 375         if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
 376                 return false;
 377
 378         return true;
 379 }
 380
 381 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
 382                       u16 to_multiplier)
 383 {
 384         struct hci_dev *hdev = conn->hdev;
 385         struct hci_conn_params *params;
 386         struct hci_cp_le_conn_update cp;
 387
 388         hci_dev_lock(hdev);
 389
 390         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 391         if (params) {
 392                 params->conn_min_interval = min;
 393                 params->conn_max_interval = max;
 394                 params->conn_latency = latency;
 395                 params->supervision_timeout = to_multiplier;
 396         }
 397
 398         hci_dev_unlock(hdev);
 399
 400         memset(&cp, 0, sizeof(cp));
 401         cp.handle               = cpu_to_le16(conn->handle);
 402         cp.conn_interval_min    = cpu_to_le16(min);
 403         cp.conn_interval_max    = cpu_to_le16(max);
 404         cp.conn_latency         = cpu_to_le16(latency);
 405         cp.supervision_timeout  = cpu_to_le16(to_multiplier);
 406         cp.min_ce_len           = cpu_to_le16(0x0000);
 407         cp.max_ce_len           = cpu_to_le16(0x0000);
 408
 409         hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
 410
 411         if (params)
 412                 return 0x01;
 413
 414         return 0x00;
 415 }
 416
 417 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
 418                       __u8 ltk[16], __u8 key_size)
 419 {
 420         struct hci_dev *hdev = conn->hdev;
 421         struct hci_cp_le_start_enc cp;
 422
 423         BT_DBG("hcon %p", conn);
 424
 425         memset(&cp, 0, sizeof(cp));
 426
 427         cp.handle = cpu_to_le16(conn->handle);
 428         cp.rand = rand;
 429         cp.ediv = ediv;
 430         memcpy(cp.ltk, ltk, key_size);
 431
 432         hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
 433 }
 434
 435 /* Device _must_ be locked */
 436 void hci_sco_setup(struct hci_conn *conn, __u8 status)
 437 {
 438         struct hci_conn *sco = conn->link;
 439
 440         if (!sco)
 441                 return;
 442
 443         BT_DBG("hcon %p", conn);
 444
 445         if (!status) {
 446                 if (lmp_esco_capable(conn->hdev))
 447                         hci_setup_sync(sco, conn->handle);
 448                 else
 449                         hci_add_sco(sco, conn->handle);
 450         } else {
 451                 hci_connect_cfm(sco, status);
 452                 hci_conn_del(sco);
 453         }
 454 }
 455
 456 static void hci_conn_timeout(struct work_struct *work)
 457 {
 458         struct hci_conn *conn = container_of(work, struct hci_conn,
 459                                              disc_work.work);
 460         int refcnt = atomic_read(&conn->refcnt);
 461
 462         BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
 463
 464         WARN_ON(refcnt < 0);
 465
 466         /* FIXME: It was observed that in pairing failed scenario, refcnt
 467          * drops below 0. Probably this is because l2cap_conn_del calls
 468          * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
 469          * dropped. After that loop hci_chan_del is called which also drops
 470          * conn. For now make sure that ACL is alive if refcnt is higher then 0,
 471          * otherwise drop it.
 472          */
 473         if (refcnt > 0)
 474                 return;
 475
 476         /* LE connections in scanning state need special handling */
 477         if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
 478             test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 479                 hci_connect_le_scan_remove(conn);
 480                 return;
 481         }
 482
 483         hci_abort_conn(conn, hci_proto_disconn_ind(conn));
 484 }
 485
 486 /* Enter sniff mode */
 487 static void hci_conn_idle(struct work_struct *work)
 488 {
 489         struct hci_conn *conn = container_of(work, struct hci_conn,
 490                                              idle_work.work);
 491         struct hci_dev *hdev = conn->hdev;
 492
 493         BT_DBG("hcon %p mode %d", conn, conn->mode);
 494
 495         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 496                 return;
 497
 498         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 499                 return;
 500
 501         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 502                 struct hci_cp_sniff_subrate cp;
 503                 cp.handle             = cpu_to_le16(conn->handle);
 504                 cp.max_latency        = cpu_to_le16(0);
 505                 cp.min_remote_timeout = cpu_to_le16(0);
 506                 cp.min_local_timeout  = cpu_to_le16(0);
 507                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 508         }
 509
 510         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 511                 struct hci_cp_sniff_mode cp;
 512                 cp.handle       = cpu_to_le16(conn->handle);
 513                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 514                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 515                 cp.attempt      = cpu_to_le16(4);
 516                 cp.timeout      = cpu_to_le16(1);
 517                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 518         }
 519 }
 520
 521 static void hci_conn_auto_accept(struct work_struct *work)
 522 {
 523         struct hci_conn *conn = container_of(work, struct hci_conn,
 524                                              auto_accept_work.work);
 525
 526         hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
 527                      &conn->dst);
 528 }
 529
 530 static void le_disable_advertising(struct hci_dev *hdev)
 531 {
 532         if (ext_adv_capable(hdev)) {
 533                 struct hci_cp_le_set_ext_adv_enable cp;
 534
 535                 cp.enable = 0x00;
 536                 cp.num_of_sets = 0x00;
 537
 538                 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
 539                              &cp);
 540         } else {
 541                 u8 enable = 0x00;
 542                 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 543                              &enable);
 544         }
 545 }
 546
 547 static void le_conn_timeout(struct work_struct *work)
 548 {
 549         struct hci_conn *conn = container_of(work, struct hci_conn,
 550                                              le_conn_timeout.work);
 551         struct hci_dev *hdev = conn->hdev;
 552
 553         BT_DBG("");
 554
 555         /* We could end up here due to having done directed advertising,
 556          * so clean up the state if necessary. This should however only
 557          * happen with broken hardware or if low duty cycle was used
 558          * (which doesn't have a timeout of its own).
 559          */
 560         if (conn->role == HCI_ROLE_SLAVE) {
 561                 /* Disable LE Advertising */
 562                 le_disable_advertising(hdev);
 563                 hci_dev_lock(hdev);
 564                 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
 565                 hci_dev_unlock(hdev);
 566                 return;
 567         }
 568
 569         hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
 570 }
 571
 572 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
 573                               u8 role)
 574 {
 575         struct hci_conn *conn;
 576
 577         BT_DBG("%s dst %pMR", hdev->name, dst);
 578
 579         conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 580         if (!conn)
 581                 return NULL;
 582
 583         bacpy(&conn->dst, dst);
 584         bacpy(&conn->src, &hdev->bdaddr);
 585         conn->hdev  = hdev;
 586         conn->type  = type;
 587         conn->role  = role;
 588         conn->mode  = HCI_CM_ACTIVE;
 589         conn->state = BT_OPEN;
 590         conn->auth_type = HCI_AT_GENERAL_BONDING;
 591         conn->io_capability = hdev->io_capability;
 592         conn->remote_auth = 0xff;
 593         conn->key_type = 0xff;
 594         conn->rssi = HCI_RSSI_INVALID;
 595         conn->tx_power = HCI_TX_POWER_INVALID;
 596         conn->max_tx_power = HCI_TX_POWER_INVALID;
 597
 598         set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
 599         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 600
 601         /* Set Default Authenticated payload timeout to 30s */
 602         conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
 603
 604         if (conn->role == HCI_ROLE_MASTER)
 605                 conn->out = true;
 606
 607         switch (type) {
 608         case ACL_LINK:
 609                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 610                 break;
 611         case LE_LINK:
 612                 /* conn->src should reflect the local identity address */
 613                 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
 614                 break;
 615         case SCO_LINK:
 616                 if (lmp_esco_capable(hdev))
 617                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 618                                         (hdev->esco_type & EDR_ESCO_MASK);
 619                 else
 620                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 621                 break;
 622         case ESCO_LINK:
 623                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 624                 break;
 625         }
 626
 627         skb_queue_head_init(&conn->data_q);
 628
 629         INIT_LIST_HEAD(&conn->chan_list);
 630
 631         INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
 632         INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
 633         INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
 634         INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
 635         INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
 636
 637         atomic_set(&conn->refcnt, 0);
 638
 639         hci_dev_hold(hdev);
 640
 641         hci_conn_hash_add(hdev, conn);
 642
 643         /* The SCO and eSCO connections will only be notified when their
 644          * setup has been completed. This is different to ACL links which
 645          * can be notified right away.
 646          */
 647         if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
 648                 if (hdev->notify)
 649                         hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 650         }
 651
 652         hci_conn_init_sysfs(conn);
 653
 654         return conn;
 655 }
 656
 657 int hci_conn_del(struct hci_conn *conn)
 658 {
 659         struct hci_dev *hdev = conn->hdev;
 660
 661         BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
 662
 663         cancel_delayed_work_sync(&conn->disc_work);
 664         cancel_delayed_work_sync(&conn->auto_accept_work);
 665         cancel_delayed_work_sync(&conn->idle_work);
 666
 667         if (conn->type == ACL_LINK) {
 668                 struct hci_conn *sco = conn->link;
 669                 if (sco)
 670                         sco->link = NULL;
 671
 672                 /* Unacked frames */
 673                 hdev->acl_cnt += conn->sent;
 674         } else if (conn->type == LE_LINK) {
 675                 cancel_delayed_work(&conn->le_conn_timeout);
 676
 677                 if (hdev->le_pkts)
 678                         hdev->le_cnt += conn->sent;
 679                 else
 680                         hdev->acl_cnt += conn->sent;
 681         } else {
 682                 struct hci_conn *acl = conn->link;
 683                 if (acl) {
 684                         acl->link = NULL;
 685                         hci_conn_drop(acl);
 686                 }
 687         }
 688
 689         if (conn->amp_mgr)
 690                 amp_mgr_put(conn->amp_mgr);
 691
 692         skb_queue_purge(&conn->data_q);
 693
 694         /* Remove the connection from the list and cleanup its remaining
 695          * state. This is a separate function since for some cases like
 696          * BT_CONNECT_SCAN we *only* want the cleanup part without the
 697          * rest of hci_conn_del.
 698          */
 699         hci_conn_cleanup(conn);
 700
 701         return 0;
 702 }
 703
 704 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
 705 {
 706         int use_src = bacmp(src, BDADDR_ANY);
 707         struct hci_dev *hdev = NULL, *d;
 708
 709         BT_DBG("%pMR -> %pMR", src, dst);
 710
 711         read_lock(&hci_dev_list_lock);
 712
 713         list_for_each_entry(d, &hci_dev_list, list) {
 714                 if (!test_bit(HCI_UP, &d->flags) ||
 715                     hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
 716                     d->dev_type != HCI_PRIMARY)
 717                         continue;
 718
 719                 /* Simple routing:
 720                  *   No source address - find interface with bdaddr != dst
 721                  *   Source address    - find interface with bdaddr == src
 722                  */
 723
 724                 if (use_src) {
 725                         bdaddr_t id_addr;
 726                         u8 id_addr_type;
 727
 728                         if (src_type == BDADDR_BREDR) {
 729                                 if (!lmp_bredr_capable(d))
 730                                         continue;
 731                                 bacpy(&id_addr, &d->bdaddr);
 732                                 id_addr_type = BDADDR_BREDR;
 733                         } else {
 734                                 if (!lmp_le_capable(d))
 735                                         continue;
 736
 737                                 hci_copy_identity_address(d, &id_addr,
 738                                                           &id_addr_type);
 739
 740                                 /* Convert from HCI to three-value type */
 741                                 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
 742                                         id_addr_type = BDADDR_LE_PUBLIC;
 743                                 else
 744                                         id_addr_type = BDADDR_LE_RANDOM;
 745                         }
 746
 747                         if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
 748                                 hdev = d; break;
 749                         }
 750                 } else {
 751                         if (bacmp(&d->bdaddr, dst)) {
 752                                 hdev = d; break;
 753                         }
 754                 }
 755         }
 756
 757         if (hdev)
 758                 hdev = hci_dev_hold(hdev);
 759
 760         read_unlock(&hci_dev_list_lock);
 761         return hdev;
 762 }
 763 EXPORT_SYMBOL(hci_get_route);
 764
 765 /* This function requires the caller holds hdev->lock */
 766 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 767 {
 768         struct hci_dev *hdev = conn->hdev;
 769         struct hci_conn_params *params;
 770
 771         params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
 772                                            conn->dst_type);
 773         if (params && params->conn) {
 774                 hci_conn_drop(params->conn);
 775                 hci_conn_put(params->conn);
 776                 params->conn = NULL;
 777         }
 778
 779         conn->state = BT_CLOSED;
 780
 781         /* If the status indicates successful cancellation of
 782          * the attempt (i.e. Unknown Connection Id) there's no point of
 783          * notifying failure since we'll go back to keep trying to
 784          * connect. The only exception is explicit connect requests
 785          * where a timeout + cancel does indicate an actual failure.
 786          */
 787         if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
 788             (params && params->explicit_connect))
 789                 mgmt_connect_failed(hdev, &conn->dst, conn->type,
 790                                     conn->dst_type, status);
 791
 792         hci_connect_cfm(conn, status);
 793
 794         hci_conn_del(conn);
 795
 796         /* The suspend notifier is waiting for all devices to disconnect and an
 797          * LE connect cancel will result in an hci_le_conn_failed. Once the last
 798          * connection is deleted, we should also wake the suspend queue to
 799          * complete suspend operations.
 800          */
 801         if (list_empty(&hdev->conn_hash.list) &&
 802             test_and_clear_bit(SUSPEND_DISCONNECTING, hdev->suspend_tasks)) {
 803                 wake_up(&hdev->suspend_wait_q);
 804         }
 805
 806         /* Since we may have temporarily stopped the background scanning in
 807          * favor of connection establishment, we should restart it.
 808          */
 809         hci_update_background_scan(hdev);
 810
 811         /* Re-enable advertising in case this was a failed connection
 812          * attempt as a peripheral.
 813          */
 814         hci_req_reenable_advertising(hdev);
 815 }
 816
 817 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 818 {
 819         struct hci_conn *conn;
 820
 821         hci_dev_lock(hdev);
 822
 823         conn = hci_lookup_le_connect(hdev);
 824
 825         if (hdev->adv_instance_cnt)
 826                 hci_req_resume_adv_instances(hdev);
 827
 828         if (!status) {
 829                 hci_connect_le_scan_cleanup(conn);
 830                 goto done;
 831         }
 832
 833         bt_dev_err(hdev, "request failed to create LE connection: "
 834                    "status 0x%2.2x", status);
 835
 836         if (!conn)
 837                 goto done;
 838
 839         hci_le_conn_failed(conn, status);
 840
 841 done:
 842         hci_dev_unlock(hdev);
 843 }
 844
 845 static bool conn_use_rpa(struct hci_conn *conn)
 846 {
 847         struct hci_dev *hdev = conn->hdev;
 848
 849         return hci_dev_test_flag(hdev, HCI_PRIVACY);
 850 }
 851
 852 static void set_ext_conn_params(struct hci_conn *conn,
 853                                 struct hci_cp_le_ext_conn_param *p)
 854 {
 855         struct hci_dev *hdev = conn->hdev;
 856
 857         memset(p, 0, sizeof(*p));
 858
 859         p->scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
 860         p->scan_window = cpu_to_le16(hdev->le_scan_window_connect);
 861         p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 862         p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 863         p->conn_latency = cpu_to_le16(conn->le_conn_latency);
 864         p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 865         p->min_ce_len = cpu_to_le16(0x0000);
 866         p->max_ce_len = cpu_to_le16(0x0000);
 867 }
 868
 869 static void hci_req_add_le_create_conn(struct hci_request *req,
 870                                        struct hci_conn *conn,
 871                                        bdaddr_t *direct_rpa)
 872 {
 873         struct hci_dev *hdev = conn->hdev;
 874         u8 own_addr_type;
 875
 876         /* If direct address was provided we use it instead of current
 877          * address.
 878          */
 879         if (direct_rpa) {
 880                 if (bacmp(&req->hdev->random_addr, direct_rpa))
 881                         hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
 882                                                                 direct_rpa);
 883
 884                 /* direct address is always RPA */
 885                 own_addr_type = ADDR_LE_DEV_RANDOM;
 886         } else {
 887                 /* Update random address, but set require_privacy to false so
 888                  * that we never connect with an non-resolvable address.
 889                  */
 890                 if (hci_update_random_address(req, false, conn_use_rpa(conn),
 891                                               &own_addr_type))
 892                         return;
 893         }
 894
 895         if (use_ext_conn(hdev)) {
 896                 struct hci_cp_le_ext_create_conn *cp;
 897                 struct hci_cp_le_ext_conn_param *p;
 898                 u8 data[sizeof(*cp) + sizeof(*p) * 3];
 899                 u32 plen;
 900
 901                 cp = (void *) data;
 902                 p = (void *) cp->data;
 903
 904                 memset(cp, 0, sizeof(*cp));
 905
 906                 bacpy(&cp->peer_addr, &conn->dst);
 907                 cp->peer_addr_type = conn->dst_type;
 908                 cp->own_addr_type = own_addr_type;
 909
 910                 plen = sizeof(*cp);
 911
 912                 if (scan_1m(hdev)) {
 913                         cp->phys |= LE_SCAN_PHY_1M;
 914                         set_ext_conn_params(conn, p);
 915
 916                         p++;
 917                         plen += sizeof(*p);
 918                 }
 919
 920                 if (scan_2m(hdev)) {
 921                         cp->phys |= LE_SCAN_PHY_2M;
 922                         set_ext_conn_params(conn, p);
 923
 924                         p++;
 925                         plen += sizeof(*p);
 926                 }
 927
 928                 if (scan_coded(hdev)) {
 929                         cp->phys |= LE_SCAN_PHY_CODED;
 930                         set_ext_conn_params(conn, p);
 931
 932                         plen += sizeof(*p);
 933                 }
 934
 935                 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
 936
 937         } else {
 938                 struct hci_cp_le_create_conn cp;
 939
 940                 memset(&cp, 0, sizeof(cp));
 941
 942                 cp.scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
 943                 cp.scan_window = cpu_to_le16(hdev->le_scan_window_connect);
 944
 945 #ifdef TIZEN_BT
 946                 /* LE auto connect */
 947                 if (!bacmp(&conn->dst, BDADDR_ANY))
 948                         cp.filter_policy = 0x1;
 949                 else
 950                 bacpy(&cp.peer_addr, &conn->dst);
 951 #else
 952                 bacpy(&cp.peer_addr, &conn->dst);
 953 #endif
 954                 cp.peer_addr_type = conn->dst_type;
 955                 cp.own_address_type = own_addr_type;
 956                 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 957                 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 958                 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
 959                 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 960                 cp.min_ce_len = cpu_to_le16(0x0000);
 961                 cp.max_ce_len = cpu_to_le16(0x0000);
 962
 963                 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 964         }
 965
 966         conn->state = BT_CONNECT;
 967         clear_bit(HCI_CONN_SCANNING, &conn->flags);
 968 }
 969
 970 static void hci_req_directed_advertising(struct hci_request *req,
 971                                          struct hci_conn *conn)
 972 {
 973         struct hci_dev *hdev = req->hdev;
 974         u8 own_addr_type;
 975         u8 enable;
 976
 977         if (ext_adv_capable(hdev)) {
 978                 struct hci_cp_le_set_ext_adv_params cp;
 979                 bdaddr_t random_addr;
 980
 981                 /* Set require_privacy to false so that the remote device has a
 982                  * chance of identifying us.
 983                  */
 984                 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
 985                                            &own_addr_type, &random_addr) < 0)
 986                         return;
 987
 988                 memset(&cp, 0, sizeof(cp));
 989
 990                 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
 991                 cp.own_addr_type = own_addr_type;
 992                 cp.channel_map = hdev->le_adv_channel_map;
 993                 cp.tx_power = HCI_TX_POWER_INVALID;
 994                 cp.primary_phy = HCI_ADV_PHY_1M;
 995                 cp.secondary_phy = HCI_ADV_PHY_1M;
 996                 cp.handle = 0; /* Use instance 0 for directed adv */
 997                 cp.own_addr_type = own_addr_type;
 998                 cp.peer_addr_type = conn->dst_type;
 999                 bacpy(&cp.peer_addr, &conn->dst);
1000
1001                 /* As per Core Spec 5.2 Vol 2, PART E, Sec 7.8.53, for
1002                  * advertising_event_property LE_LEGACY_ADV_DIRECT_IND
1003                  * does not supports advertising data when the advertising set already
1004                  * contains some, the controller shall return erroc code 'Invalid
1005                  * HCI Command Parameters(0x12).
1006                  * So it is required to remove adv set for handle 0x00. since we use
1007                  * instance 0 for directed adv.
1008                  */
1009                 __hci_req_remove_ext_adv_instance(req, cp.handle);
1010
1011                 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
1012
1013                 if (own_addr_type == ADDR_LE_DEV_RANDOM &&
1014                     bacmp(&random_addr, BDADDR_ANY) &&
1015                     bacmp(&random_addr, &hdev->random_addr)) {
1016                         struct hci_cp_le_set_adv_set_rand_addr cp;
1017
1018                         memset(&cp, 0, sizeof(cp));
1019
1020                         cp.handle = 0;
1021                         bacpy(&cp.bdaddr, &random_addr);
1022
1023                         hci_req_add(req,
1024                                     HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
1025                                     sizeof(cp), &cp);
1026                 }
1027
1028                 __hci_req_enable_ext_advertising(req, 0x00);
1029         } else {
1030                 struct hci_cp_le_set_adv_param cp;
1031
1032                 /* Clear the HCI_LE_ADV bit temporarily so that the
1033                  * hci_update_random_address knows that it's safe to go ahead
1034                  * and write a new random address. The flag will be set back on
1035                  * as soon as the SET_ADV_ENABLE HCI command completes.
1036                  */
1037                 hci_dev_clear_flag(hdev, HCI_LE_ADV);
1038
1039                 /* Set require_privacy to false so that the remote device has a
1040                  * chance of identifying us.
1041                  */
1042                 if (hci_update_random_address(req, false, conn_use_rpa(conn),
1043                                               &own_addr_type) < 0)
1044                         return;
1045
1046                 memset(&cp, 0, sizeof(cp));
1047
1048                 /* Some controllers might reject command if intervals are not
1049                  * within range for undirected advertising.
1050                  * BCM20702A0 is known to be affected by this.
1051                  */
1052                 cp.min_interval = cpu_to_le16(0x0020);
1053                 cp.max_interval = cpu_to_le16(0x0020);
1054
1055                 cp.type = LE_ADV_DIRECT_IND;
1056                 cp.own_address_type = own_addr_type;
1057                 cp.direct_addr_type = conn->dst_type;
1058                 bacpy(&cp.direct_addr, &conn->dst);
1059                 cp.channel_map = hdev->le_adv_channel_map;
1060
1061                 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
1062
1063                 enable = 0x01;
1064                 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1065                             &enable);
1066         }
1067
1068         conn->state = BT_CONNECT;
1069 }
1070
1071 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1072                                 u8 dst_type, u8 sec_level, u16 conn_timeout,
1073                                 u8 role, bdaddr_t *direct_rpa)
1074 {
1075         struct hci_conn_params *params;
1076         struct hci_conn *conn;
1077         struct smp_irk *irk;
1078         struct hci_request req;
1079         int err;
1080
1081         /* This ensures that during disable le_scan address resolution
1082          * will not be disabled if it is followed by le_create_conn
1083          */
1084         bool rpa_le_conn = true;
1085
1086         /* Let's make sure that le is enabled.*/
1087         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1088                 if (lmp_le_capable(hdev))
1089                         return ERR_PTR(-ECONNREFUSED);
1090
1091                 return ERR_PTR(-EOPNOTSUPP);
1092         }
1093
1094         /* Since the controller supports only one LE connection attempt at a
1095          * time, we return -EBUSY if there is any connection attempt running.
1096          */
1097         if (hci_lookup_le_connect(hdev))
1098                 return ERR_PTR(-EBUSY);
1099
1100         /* If there's already a connection object but it's not in
1101          * scanning state it means it must already be established, in
1102          * which case we can't do anything else except report a failure
1103          * to connect.
1104          */
1105         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1106         if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1107                 return ERR_PTR(-EBUSY);
1108         }
1109
1110         /* When given an identity address with existing identity
1111          * resolving key, the connection needs to be established
1112          * to a resolvable random address.
1113          *
1114          * Storing the resolvable random address is required here
1115          * to handle connection failures. The address will later
1116          * be resolved back into the original identity address
1117          * from the connect request.
1118          */
1119         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1120         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1121                 dst = &irk->rpa;
1122                 dst_type = ADDR_LE_DEV_RANDOM;
1123         }
1124
1125         if (conn) {
1126                 bacpy(&conn->dst, dst);
1127         } else {
1128                 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1129                 if (!conn)
1130                         return ERR_PTR(-ENOMEM);
1131                 hci_conn_hold(conn);
1132                 conn->pending_sec_level = sec_level;
1133         }
1134
1135         conn->dst_type = dst_type;
1136         conn->sec_level = BT_SECURITY_LOW;
1137         conn->conn_timeout = conn_timeout;
1138
1139         hci_req_init(&req, hdev);
1140
1141         /* Disable advertising if we're active. For central role
1142          * connections most controllers will refuse to connect if
1143          * advertising is enabled, and for peripheral role connections we
1144          * anyway have to disable it in order to start directed
1145          * advertising. Any registered advertisements will be
1146          * re-enabled after the connection attempt is finished.
1147          */
1148         if (hci_dev_test_flag(hdev, HCI_LE_ADV))
1149                 __hci_req_pause_adv_instances(&req);
1150
1151         /* If requested to connect as peripheral use directed advertising */
1152         if (conn->role == HCI_ROLE_SLAVE) {
1153                 /* If we're active scanning most controllers are unable
1154                  * to initiate advertising. Simply reject the attempt.
1155                  */
1156                 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1157                     hdev->le_scan_type == LE_SCAN_ACTIVE) {
1158                         hci_req_purge(&req);
1159                         hci_conn_del(conn);
1160                         return ERR_PTR(-EBUSY);
1161                 }
1162
1163                 hci_req_directed_advertising(&req, conn);
1164                 goto create_conn;
1165         }
1166
1167         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1168         if (params) {
1169                 conn->le_conn_min_interval = params->conn_min_interval;
1170                 conn->le_conn_max_interval = params->conn_max_interval;
1171                 conn->le_conn_latency = params->conn_latency;
1172                 conn->le_supv_timeout = params->supervision_timeout;
1173         } else {
1174                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1175                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1176                 conn->le_conn_latency = hdev->le_conn_latency;
1177                 conn->le_supv_timeout = hdev->le_supv_timeout;
1178         }
1179
1180         /* If controller is scanning, we stop it since some controllers are
1181          * not able to scan and connect at the same time. Also set the
1182          * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1183          * handler for scan disabling knows to set the correct discovery
1184          * state.
1185          */
1186         if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1187                 hci_req_add_le_scan_disable(&req, rpa_le_conn);
1188                 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1189         }
1190
1191         hci_req_add_le_create_conn(&req, conn, direct_rpa);
1192
1193 create_conn:
1194         err = hci_req_run(&req, create_le_conn_complete);
1195         if (err) {
1196                 hci_conn_del(conn);
1197
1198                 if (hdev->adv_instance_cnt)
1199                         hci_req_resume_adv_instances(hdev);
1200
1201                 return ERR_PTR(err);
1202         }
1203
1204         return conn;
1205 }
1206
1207 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1208 {
1209         struct hci_conn *conn;
1210
1211         conn = hci_conn_hash_lookup_le(hdev, addr, type);
1212         if (!conn)
1213                 return false;
1214
1215         if (conn->state != BT_CONNECTED)
1216                 return false;
1217
1218         return true;
1219 }
1220
1221 /* This function requires the caller holds hdev->lock */
1222 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1223                                         bdaddr_t *addr, u8 addr_type)
1224 {
1225         struct hci_conn_params *params;
1226
1227         if (is_connected(hdev, addr, addr_type))
1228                 return -EISCONN;
1229
1230         params = hci_conn_params_lookup(hdev, addr, addr_type);
1231         if (!params) {
1232                 params = hci_conn_params_add(hdev, addr, addr_type);
1233                 if (!params)
1234                         return -ENOMEM;
1235
1236                 /* If we created new params, mark them to be deleted in
1237                  * hci_connect_le_scan_cleanup. It's different case than
1238                  * existing disabled params, those will stay after cleanup.
1239                  */
1240                 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1241         }
1242
1243         /* We're trying to connect, so make sure params are at pend_le_conns */
1244         if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1245             params->auto_connect == HCI_AUTO_CONN_REPORT ||
1246             params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1247                 list_del_init(&params->action);
1248                 list_add(&params->action, &hdev->pend_le_conns);
1249         }
1250
1251         params->explicit_connect = true;
1252
1253         BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1254                params->auto_connect);
1255
1256         return 0;
1257 }
1258
1259 /* This function requires the caller holds hdev->lock */
1260 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1261                                      u8 dst_type, u8 sec_level,
1262                                      u16 conn_timeout,
1263                                      enum conn_reasons conn_reason)
1264 {
1265         struct hci_conn *conn;
1266
1267         /* Let's make sure that le is enabled.*/
1268         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1269                 if (lmp_le_capable(hdev))
1270                         return ERR_PTR(-ECONNREFUSED);
1271
1272                 return ERR_PTR(-EOPNOTSUPP);
1273         }
1274
1275         /* Some devices send ATT messages as soon as the physical link is
1276          * established. To be able to handle these ATT messages, the user-
1277          * space first establishes the connection and then starts the pairing
1278          * process.
1279          *
1280          * So if a hci_conn object already exists for the following connection
1281          * attempt, we simply update pending_sec_level and auth_type fields
1282          * and return the object found.
1283          */
1284         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1285         if (conn) {
1286                 if (conn->pending_sec_level < sec_level)
1287                         conn->pending_sec_level = sec_level;
1288                 goto done;
1289         }
1290
1291         BT_DBG("requesting refresh of dst_addr");
1292
1293         conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1294         if (!conn)
1295                 return ERR_PTR(-ENOMEM);
1296
1297         if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1298                 hci_conn_del(conn);
1299                 return ERR_PTR(-EBUSY);
1300         }
1301
1302         conn->state = BT_CONNECT;
1303         set_bit(HCI_CONN_SCANNING, &conn->flags);
1304         conn->dst_type = dst_type;
1305         conn->sec_level = BT_SECURITY_LOW;
1306         conn->pending_sec_level = sec_level;
1307         conn->conn_timeout = conn_timeout;
1308         conn->conn_reason = conn_reason;
1309
1310         hci_update_background_scan(hdev);
1311
1312 done:
1313         hci_conn_hold(conn);
1314         return conn;
1315 }
1316
1317 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1318                                  u8 sec_level, u8 auth_type,
1319                                  enum conn_reasons conn_reason)
1320 {
1321         struct hci_conn *acl;
1322
1323         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1324                 if (lmp_bredr_capable(hdev))
1325                         return ERR_PTR(-ECONNREFUSED);
1326
1327                 return ERR_PTR(-EOPNOTSUPP);
1328         }
1329
1330         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1331         if (!acl) {
1332                 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1333                 if (!acl)
1334                         return ERR_PTR(-ENOMEM);
1335         }
1336
1337         hci_conn_hold(acl);
1338
1339         acl->conn_reason = conn_reason;
1340         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1341                 acl->sec_level = BT_SECURITY_LOW;
1342                 acl->pending_sec_level = sec_level;
1343                 acl->auth_type = auth_type;
1344                 hci_acl_create_connection(acl);
1345         }
1346
1347         return acl;
1348 }
1349
1350 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1351                                  __u16 setting)
1352 {
1353         struct hci_conn *acl;
1354         struct hci_conn *sco;
1355
1356         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1357                               CONN_REASON_SCO_CONNECT);
1358         if (IS_ERR(acl))
1359                 return acl;
1360
1361         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1362         if (!sco) {
1363                 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1364                 if (!sco) {
1365                         hci_conn_drop(acl);
1366                         return ERR_PTR(-ENOMEM);
1367                 }
1368         }
1369
1370         acl->link = sco;
1371         sco->link = acl;
1372
1373         hci_conn_hold(sco);
1374
1375         sco->setting = setting;
1376
1377         if (acl->state == BT_CONNECTED &&
1378             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1379                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1380                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1381
1382                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1383                         /* defer SCO setup until mode change completed */
1384                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1385                         return sco;
1386                 }
1387
1388                 hci_sco_setup(acl, 0x00);
1389         }
1390
1391         return sco;
1392 }
1393
1394 /* Check link security requirement */
1395 int hci_conn_check_link_mode(struct hci_conn *conn)
1396 {
1397         BT_DBG("hcon %p", conn);
1398
1399         /* In Secure Connections Only mode, it is required that Secure
1400          * Connections is used and the link is encrypted with AES-CCM
1401          * using a P-256 authenticated combination key.
1402          */
1403         if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1404                 if (!hci_conn_sc_enabled(conn) ||
1405                     !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1406                     conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1407                         return 0;
1408         }
1409
1410          /* AES encryption is required for Level 4:
1411           *
1412           * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
1413           * page 1319:
1414           *
1415           * 128-bit equivalent strength for link and encryption keys
1416           * required using FIPS approved algorithms (E0 not allowed,
1417           * SAFER+ not allowed, and P-192 not allowed; encryption key
1418           * not shortened)
1419           */
1420         if (conn->sec_level == BT_SECURITY_FIPS &&
1421             !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
1422                 bt_dev_err(conn->hdev,
1423                            "Invalid security: Missing AES-CCM usage");
1424                 return 0;
1425         }
1426
1427         if (hci_conn_ssp_enabled(conn) &&
1428             !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1429                 return 0;
1430
1431         return 1;
1432 }
1433
1434 /* Authenticate remote device */
1435 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1436 {
1437         BT_DBG("hcon %p", conn);
1438
1439         if (conn->pending_sec_level > sec_level)
1440                 sec_level = conn->pending_sec_level;
1441
1442         if (sec_level > conn->sec_level)
1443                 conn->pending_sec_level = sec_level;
1444         else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1445                 return 1;
1446
1447         /* Make sure we preserve an existing MITM requirement*/
1448         auth_type |= (conn->auth_type & 0x01);
1449
1450         conn->auth_type = auth_type;
1451
1452         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1453                 struct hci_cp_auth_requested cp;
1454
1455                 cp.handle = cpu_to_le16(conn->handle);
1456                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1457                              sizeof(cp), &cp);
1458
1459                 /* If we're already encrypted set the REAUTH_PEND flag,
1460                  * otherwise set the ENCRYPT_PEND.
1461                  */
1462                 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1463                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1464                 else
1465                         set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1466         }
1467
1468         return 0;
1469 }
1470
1471 /* Encrypt the link */
1472 static void hci_conn_encrypt(struct hci_conn *conn)
1473 {
1474         BT_DBG("hcon %p", conn);
1475
1476         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1477                 struct hci_cp_set_conn_encrypt cp;
1478                 cp.handle  = cpu_to_le16(conn->handle);
1479                 cp.encrypt = 0x01;
1480                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1481                              &cp);
1482         }
1483 }
1484
1485 /* Enable security */
1486 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1487                       bool initiator)
1488 {
1489         BT_DBG("hcon %p", conn);
1490
1491         if (conn->type == LE_LINK)
1492                 return smp_conn_security(conn, sec_level);
1493
1494         /* For sdp we don't need the link key. */
1495         if (sec_level == BT_SECURITY_SDP)
1496                 return 1;
1497
1498         /* For non 2.1 devices and low security level we don't need the link
1499            key. */
1500         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1501                 return 1;
1502
1503         /* For other security levels we need the link key. */
1504         if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1505                 goto auth;
1506
1507         /* An authenticated FIPS approved combination key has sufficient
1508          * security for security level 4. */
1509         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1510             sec_level == BT_SECURITY_FIPS)
1511                 goto encrypt;
1512
1513         /* An authenticated combination key has sufficient security for
1514            security level 3. */
1515         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1516              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1517             sec_level == BT_SECURITY_HIGH)
1518                 goto encrypt;
1519
1520         /* An unauthenticated combination key has sufficient security for
1521            security level 1 and 2. */
1522         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1523              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1524             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1525                 goto encrypt;
1526
1527         /* A combination key has always sufficient security for the security
1528            levels 1 or 2. High security level requires the combination key
1529            is generated using maximum PIN code length (16).
1530            For pre 2.1 units. */
1531         if (conn->key_type == HCI_LK_COMBINATION &&
1532             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1533              conn->pin_length == 16))
1534                 goto encrypt;
1535
1536 auth:
1537         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1538                 return 0;
1539
1540         if (initiator)
1541                 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1542
1543         if (!hci_conn_auth(conn, sec_level, auth_type))
1544                 return 0;
1545
1546 encrypt:
1547         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1548                 /* Ensure that the encryption key size has been read,
1549                  * otherwise stall the upper layer responses.
1550                  */
1551                 if (!conn->enc_key_size)
1552                         return 0;
1553
1554                 /* Nothing else needed, all requirements are met */
1555                 return 1;
1556         }
1557
1558         hci_conn_encrypt(conn);
1559         return 0;
1560 }
1561 EXPORT_SYMBOL(hci_conn_security);
1562
1563 /* Check secure link requirement */
1564 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1565 {
1566         BT_DBG("hcon %p", conn);
1567
1568         /* Accept if non-secure or higher security level is required */
1569         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1570                 return 1;
1571
1572         /* Accept if secure or higher security level is already present */
1573         if (conn->sec_level == BT_SECURITY_HIGH ||
1574             conn->sec_level == BT_SECURITY_FIPS)
1575                 return 1;
1576
1577         /* Reject not secure link */
1578         return 0;
1579 }
1580 EXPORT_SYMBOL(hci_conn_check_secure);
1581
1582 /* Switch role */
1583 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1584 {
1585         BT_DBG("hcon %p", conn);
1586
1587         if (role == conn->role)
1588                 return 1;
1589
1590         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1591                 struct hci_cp_switch_role cp;
1592                 bacpy(&cp.bdaddr, &conn->dst);
1593                 cp.role = role;
1594                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1595         }
1596
1597         return 0;
1598 }
1599 EXPORT_SYMBOL(hci_conn_switch_role);
1600
1601 #ifdef TIZEN_BT
1602 int hci_conn_change_supervision_timeout(struct hci_conn *conn, __u16 timeout)
1603 {
1604         struct hci_cp_write_link_supervision_timeout cp;
1605
1606         if (!((get_link_mode(conn)) & HCI_LM_MASTER))
1607                 return 1;
1608
1609         if (conn->handle == 0)
1610                 return 1;
1611
1612         memset(&cp, 0, sizeof(cp));
1613         cp.handle  = cpu_to_le16(conn->handle);
1614         cp.timeout = cpu_to_le16(timeout);
1615
1616         if (hci_send_cmd(conn->hdev, HCI_OP_WRITE_LINK_SUPERVISION_TIMEOUT,
1617                          sizeof(cp), &cp) < 0)
1618                 BT_ERR("HCI_OP_WRITE_LINK_SUPERVISION_TIMEOUT is failed");
1619
1620         return 0;
1621 }
1622 #endif
1623
1624 /* Enter active mode */
1625 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1626 {
1627         struct hci_dev *hdev = conn->hdev;
1628
1629         BT_DBG("hcon %p mode %d", conn, conn->mode);
1630
1631         if (conn->mode != HCI_CM_SNIFF)
1632                 goto timer;
1633
1634         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1635                 goto timer;
1636
1637         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1638                 struct hci_cp_exit_sniff_mode cp;
1639                 cp.handle = cpu_to_le16(conn->handle);
1640                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1641         }
1642
1643 timer:
1644         if (hdev->idle_timeout > 0)
1645                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1646                                    msecs_to_jiffies(hdev->idle_timeout));
1647 }
1648
1649 /* Drop all connection on the device */
1650 void hci_conn_hash_flush(struct hci_dev *hdev)
1651 {
1652         struct hci_conn_hash *h = &hdev->conn_hash;
1653         struct hci_conn *c, *n;
1654
1655         BT_DBG("hdev %s", hdev->name);
1656
1657         list_for_each_entry_safe(c, n, &h->list, list) {
1658                 c->state = BT_CLOSED;
1659
1660                 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1661                 hci_conn_del(c);
1662         }
1663 }
1664
1665 /* Check pending connect attempts */
1666 void hci_conn_check_pending(struct hci_dev *hdev)
1667 {
1668         struct hci_conn *conn;
1669
1670         BT_DBG("hdev %s", hdev->name);
1671
1672         hci_dev_lock(hdev);
1673
1674         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1675         if (conn)
1676                 hci_acl_create_connection(conn);
1677
1678         hci_dev_unlock(hdev);
1679 }
1680
1681 #ifndef TIZEN_BT
1682 static u32 get_link_mode(struct hci_conn *conn)
1683 #else
1684 u32 get_link_mode(struct hci_conn *conn)
1685 #endif
1686 {
1687         u32 link_mode = 0;
1688
1689         if (conn->role == HCI_ROLE_MASTER)
1690                 link_mode |= HCI_LM_MASTER;
1691
1692         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1693                 link_mode |= HCI_LM_ENCRYPT;
1694
1695         if (test_bit(HCI_CONN_AUTH, &conn->flags))
1696                 link_mode |= HCI_LM_AUTH;
1697
1698         if (test_bit(HCI_CONN_SECURE, &conn->flags))
1699                 link_mode |= HCI_LM_SECURE;
1700
1701         if (test_bit(HCI_CONN_FIPS, &conn->flags))
1702                 link_mode |= HCI_LM_FIPS;
1703
1704         return link_mode;
1705 }
1706
1707 int hci_get_conn_list(void __user *arg)
1708 {
1709         struct hci_conn *c;
1710         struct hci_conn_list_req req, *cl;
1711         struct hci_conn_info *ci;
1712         struct hci_dev *hdev;
1713         int n = 0, size, err;
1714
1715         if (copy_from_user(&req, arg, sizeof(req)))
1716                 return -EFAULT;
1717
1718         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1719                 return -EINVAL;
1720
1721         size = sizeof(req) + req.conn_num * sizeof(*ci);
1722
1723         cl = kmalloc(size, GFP_KERNEL);
1724         if (!cl)
1725                 return -ENOMEM;
1726
1727         hdev = hci_dev_get(req.dev_id);
1728         if (!hdev) {
1729                 kfree(cl);
1730                 return -ENODEV;
1731         }
1732
1733         ci = cl->conn_info;
1734
1735         hci_dev_lock(hdev);
1736         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1737                 bacpy(&(ci + n)->bdaddr, &c->dst);
1738                 (ci + n)->handle = c->handle;
1739                 (ci + n)->type  = c->type;
1740                 (ci + n)->out   = c->out;
1741                 (ci + n)->state = c->state;
1742                 (ci + n)->link_mode = get_link_mode(c);
1743                 if (++n >= req.conn_num)
1744                         break;
1745         }
1746         hci_dev_unlock(hdev);
1747
1748         cl->dev_id = hdev->id;
1749         cl->conn_num = n;
1750         size = sizeof(req) + n * sizeof(*ci);
1751
1752         hci_dev_put(hdev);
1753
1754         err = copy_to_user(arg, cl, size);
1755         kfree(cl);
1756
1757         return err ? -EFAULT : 0;
1758 }
1759
1760 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1761 {
1762         struct hci_conn_info_req req;
1763         struct hci_conn_info ci;
1764         struct hci_conn *conn;
1765         char __user *ptr = arg + sizeof(req);
1766
1767         if (copy_from_user(&req, arg, sizeof(req)))
1768                 return -EFAULT;
1769
1770         hci_dev_lock(hdev);
1771         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1772         if (conn) {
1773                 bacpy(&ci.bdaddr, &conn->dst);
1774                 ci.handle = conn->handle;
1775                 ci.type  = conn->type;
1776                 ci.out   = conn->out;
1777                 ci.state = conn->state;
1778                 ci.link_mode = get_link_mode(conn);
1779         }
1780         hci_dev_unlock(hdev);
1781
1782         if (!conn)
1783                 return -ENOENT;
1784
1785         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1786 }
1787
1788 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1789 {
1790         struct hci_auth_info_req req;
1791         struct hci_conn *conn;
1792
1793         if (copy_from_user(&req, arg, sizeof(req)))
1794                 return -EFAULT;
1795
1796         hci_dev_lock(hdev);
1797         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1798         if (conn)
1799                 req.type = conn->auth_type;
1800         hci_dev_unlock(hdev);
1801
1802         if (!conn)
1803                 return -ENOENT;
1804
1805         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1806 }
1807
1808 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1809 {
1810         struct hci_dev *hdev = conn->hdev;
1811         struct hci_chan *chan;
1812
1813         BT_DBG("%s hcon %p", hdev->name, conn);
1814
1815         if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1816                 BT_DBG("Refusing to create new hci_chan");
1817                 return NULL;
1818         }
1819
1820         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1821         if (!chan)
1822                 return NULL;
1823
1824         chan->conn = hci_conn_get(conn);
1825         skb_queue_head_init(&chan->data_q);
1826         chan->state = BT_CONNECTED;
1827
1828         list_add_rcu(&chan->list, &conn->chan_list);
1829
1830         return chan;
1831 }
1832
1833 void hci_chan_del(struct hci_chan *chan)
1834 {
1835         struct hci_conn *conn = chan->conn;
1836         struct hci_dev *hdev = conn->hdev;
1837
1838         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1839
1840         list_del_rcu(&chan->list);
1841
1842         synchronize_rcu();
1843
1844         /* Prevent new hci_chan's to be created for this hci_conn */
1845         set_bit(HCI_CONN_DROP, &conn->flags);
1846
1847         hci_conn_put(conn);
1848
1849         skb_queue_purge(&chan->data_q);
1850         kfree(chan);
1851 }
1852
1853 void hci_chan_list_flush(struct hci_conn *conn)
1854 {
1855         struct hci_chan *chan, *n;
1856
1857         BT_DBG("hcon %p", conn);
1858
1859         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1860                 hci_chan_del(chan);
1861 }
1862
1863 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1864                                                  __u16 handle)
1865 {
1866         struct hci_chan *hchan;
1867
1868         list_for_each_entry(hchan, &hcon->chan_list, list) {
1869                 if (hchan->handle == handle)
1870                         return hchan;
1871         }
1872
1873         return NULL;
1874 }
1875
1876 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1877 {
1878         struct hci_conn_hash *h = &hdev->conn_hash;
1879         struct hci_conn *hcon;
1880         struct hci_chan *hchan = NULL;
1881
1882         rcu_read_lock();
1883
1884         list_for_each_entry_rcu(hcon, &h->list, list) {
1885                 hchan = __hci_chan_lookup_handle(hcon, handle);
1886                 if (hchan)
1887                         break;
1888         }
1889
1890         rcu_read_unlock();
1891
1892         return hchan;
1893 }
1894
1895 u32 hci_conn_get_phy(struct hci_conn *conn)
1896 {
1897         u32 phys = 0;
1898
1899         /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
1900          * Table 6.2: Packets defined for synchronous, asynchronous, and
1901          * CPB logical transport types.
1902          */
1903         switch (conn->type) {
1904         case SCO_LINK:
1905                 /* SCO logical transport (1 Mb/s):
1906                  * HV1, HV2, HV3 and DV.
1907                  */
1908                 phys |= BT_PHY_BR_1M_1SLOT;
1909
1910                 break;
1911
1912         case ACL_LINK:
1913                 /* ACL logical transport (1 Mb/s) ptt=0:
1914                  * DH1, DM3, DH3, DM5 and DH5.
1915                  */
1916                 phys |= BT_PHY_BR_1M_1SLOT;
1917
1918                 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
1919                         phys |= BT_PHY_BR_1M_3SLOT;
1920
1921                 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
1922                         phys |= BT_PHY_BR_1M_5SLOT;
1923
1924                 /* ACL logical transport (2 Mb/s) ptt=1:
1925                  * 2-DH1, 2-DH3 and 2-DH5.
1926                  */
1927                 if (!(conn->pkt_type & HCI_2DH1))
1928                         phys |= BT_PHY_EDR_2M_1SLOT;
1929
1930                 if (!(conn->pkt_type & HCI_2DH3))
1931                         phys |= BT_PHY_EDR_2M_3SLOT;
1932
1933                 if (!(conn->pkt_type & HCI_2DH5))
1934                         phys |= BT_PHY_EDR_2M_5SLOT;
1935
1936                 /* ACL logical transport (3 Mb/s) ptt=1:
1937                  * 3-DH1, 3-DH3 and 3-DH5.
1938                  */
1939                 if (!(conn->pkt_type & HCI_3DH1))
1940                         phys |= BT_PHY_EDR_3M_1SLOT;
1941
1942                 if (!(conn->pkt_type & HCI_3DH3))
1943                         phys |= BT_PHY_EDR_3M_3SLOT;
1944
1945                 if (!(conn->pkt_type & HCI_3DH5))
1946                         phys |= BT_PHY_EDR_3M_5SLOT;
1947
1948                 break;
1949
1950         case ESCO_LINK:
1951                 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
1952                 phys |= BT_PHY_BR_1M_1SLOT;
1953
1954                 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
1955                         phys |= BT_PHY_BR_1M_3SLOT;
1956
1957                 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
1958                 if (!(conn->pkt_type & ESCO_2EV3))
1959                         phys |= BT_PHY_EDR_2M_1SLOT;
1960
1961                 if (!(conn->pkt_type & ESCO_2EV5))
1962                         phys |= BT_PHY_EDR_2M_3SLOT;
1963
1964                 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
1965                 if (!(conn->pkt_type & ESCO_3EV3))
1966                         phys |= BT_PHY_EDR_3M_1SLOT;
1967
1968                 if (!(conn->pkt_type & ESCO_3EV5))
1969                         phys |= BT_PHY_EDR_3M_3SLOT;
1970
1971                 break;
1972
1973         case LE_LINK:
1974                 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
1975                         phys |= BT_PHY_LE_1M_TX;
1976
1977                 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
1978                         phys |= BT_PHY_LE_1M_RX;
1979
1980                 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
1981                         phys |= BT_PHY_LE_2M_TX;
1982
1983                 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
1984                         phys |= BT_PHY_LE_2M_RX;
1985
1986                 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
1987                         phys |= BT_PHY_LE_CODED_TX;
1988
1989                 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
1990                         phys |= BT_PHY_LE_CODED_RX;
1991
1992                 break;
1993         }
1994
1995         return phys;
1996 }