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_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
 564                 return;
 565         }
 566
 567         hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
 568 }
 569
 570 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
 571                               u8 role)
 572 {
 573         struct hci_conn *conn;
 574
 575         BT_DBG("%s dst %pMR", hdev->name, dst);
 576
 577         conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 578         if (!conn)
 579                 return NULL;
 580
 581         bacpy(&conn->dst, dst);
 582         bacpy(&conn->src, &hdev->bdaddr);
 583         conn->hdev  = hdev;
 584         conn->type  = type;
 585         conn->role  = role;
 586         conn->mode  = HCI_CM_ACTIVE;
 587         conn->state = BT_OPEN;
 588         conn->auth_type = HCI_AT_GENERAL_BONDING;
 589         conn->io_capability = hdev->io_capability;
 590         conn->remote_auth = 0xff;
 591         conn->key_type = 0xff;
 592         conn->rssi = HCI_RSSI_INVALID;
 593         conn->tx_power = HCI_TX_POWER_INVALID;
 594         conn->max_tx_power = HCI_TX_POWER_INVALID;
 595
 596         set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
 597         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 598
 599         /* Set Default Authenticated payload timeout to 30s */
 600         conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
 601
 602         if (conn->role == HCI_ROLE_MASTER)
 603                 conn->out = true;
 604
 605         switch (type) {
 606         case ACL_LINK:
 607                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 608                 break;
 609         case LE_LINK:
 610                 /* conn->src should reflect the local identity address */
 611                 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
 612                 break;
 613         case SCO_LINK:
 614                 if (lmp_esco_capable(hdev))
 615                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 616                                         (hdev->esco_type & EDR_ESCO_MASK);
 617                 else
 618                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 619                 break;
 620         case ESCO_LINK:
 621                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 622                 break;
 623         }
 624
 625         skb_queue_head_init(&conn->data_q);
 626
 627         INIT_LIST_HEAD(&conn->chan_list);
 628
 629         INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
 630         INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
 631         INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
 632         INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
 633         INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
 634
 635         atomic_set(&conn->refcnt, 0);
 636
 637         hci_dev_hold(hdev);
 638
 639         hci_conn_hash_add(hdev, conn);
 640
 641         /* The SCO and eSCO connections will only be notified when their
 642          * setup has been completed. This is different to ACL links which
 643          * can be notified right away.
 644          */
 645         if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
 646                 if (hdev->notify)
 647                         hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 648         }
 649
 650         hci_conn_init_sysfs(conn);
 651
 652         return conn;
 653 }
 654
 655 int hci_conn_del(struct hci_conn *conn)
 656 {
 657         struct hci_dev *hdev = conn->hdev;
 658
 659         BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
 660
 661         cancel_delayed_work_sync(&conn->disc_work);
 662         cancel_delayed_work_sync(&conn->auto_accept_work);
 663         cancel_delayed_work_sync(&conn->idle_work);
 664
 665         if (conn->type == ACL_LINK) {
 666                 struct hci_conn *sco = conn->link;
 667                 if (sco)
 668                         sco->link = NULL;
 669
 670                 /* Unacked frames */
 671                 hdev->acl_cnt += conn->sent;
 672         } else if (conn->type == LE_LINK) {
 673                 cancel_delayed_work(&conn->le_conn_timeout);
 674
 675                 if (hdev->le_pkts)
 676                         hdev->le_cnt += conn->sent;
 677                 else
 678                         hdev->acl_cnt += conn->sent;
 679         } else {
 680                 struct hci_conn *acl = conn->link;
 681                 if (acl) {
 682                         acl->link = NULL;
 683                         hci_conn_drop(acl);
 684                 }
 685         }
 686
 687         if (conn->amp_mgr)
 688                 amp_mgr_put(conn->amp_mgr);
 689
 690         skb_queue_purge(&conn->data_q);
 691
 692         /* Remove the connection from the list and cleanup its remaining
 693          * state. This is a separate function since for some cases like
 694          * BT_CONNECT_SCAN we *only* want the cleanup part without the
 695          * rest of hci_conn_del.
 696          */
 697         hci_conn_cleanup(conn);
 698
 699         return 0;
 700 }
 701
 702 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
 703 {
 704         int use_src = bacmp(src, BDADDR_ANY);
 705         struct hci_dev *hdev = NULL, *d;
 706
 707         BT_DBG("%pMR -> %pMR", src, dst);
 708
 709         read_lock(&hci_dev_list_lock);
 710
 711         list_for_each_entry(d, &hci_dev_list, list) {
 712                 if (!test_bit(HCI_UP, &d->flags) ||
 713                     hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
 714                     d->dev_type != HCI_PRIMARY)
 715                         continue;
 716
 717                 /* Simple routing:
 718                  *   No source address - find interface with bdaddr != dst
 719                  *   Source address    - find interface with bdaddr == src
 720                  */
 721
 722                 if (use_src) {
 723                         bdaddr_t id_addr;
 724                         u8 id_addr_type;
 725
 726                         if (src_type == BDADDR_BREDR) {
 727                                 if (!lmp_bredr_capable(d))
 728                                         continue;
 729                                 bacpy(&id_addr, &d->bdaddr);
 730                                 id_addr_type = BDADDR_BREDR;
 731                         } else {
 732                                 if (!lmp_le_capable(d))
 733                                         continue;
 734
 735                                 hci_copy_identity_address(d, &id_addr,
 736                                                           &id_addr_type);
 737
 738                                 /* Convert from HCI to three-value type */
 739                                 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
 740                                         id_addr_type = BDADDR_LE_PUBLIC;
 741                                 else
 742                                         id_addr_type = BDADDR_LE_RANDOM;
 743                         }
 744
 745                         if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
 746                                 hdev = d; break;
 747                         }
 748                 } else {
 749                         if (bacmp(&d->bdaddr, dst)) {
 750                                 hdev = d; break;
 751                         }
 752                 }
 753         }
 754
 755         if (hdev)
 756                 hdev = hci_dev_hold(hdev);
 757
 758         read_unlock(&hci_dev_list_lock);
 759         return hdev;
 760 }
 761 EXPORT_SYMBOL(hci_get_route);
 762
 763 /* This function requires the caller holds hdev->lock */
 764 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 765 {
 766         struct hci_dev *hdev = conn->hdev;
 767         struct hci_conn_params *params;
 768
 769         params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
 770                                            conn->dst_type);
 771         if (params && params->conn) {
 772                 hci_conn_drop(params->conn);
 773                 hci_conn_put(params->conn);
 774                 params->conn = NULL;
 775         }
 776
 777         conn->state = BT_CLOSED;
 778
 779         /* If the status indicates successful cancellation of
 780          * the attempt (i.e. Unknown Connection Id) there's no point of
 781          * notifying failure since we'll go back to keep trying to
 782          * connect. The only exception is explicit connect requests
 783          * where a timeout + cancel does indicate an actual failure.
 784          */
 785         if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
 786             (params && params->explicit_connect))
 787                 mgmt_connect_failed(hdev, &conn->dst, conn->type,
 788                                     conn->dst_type, status);
 789
 790         hci_connect_cfm(conn, status);
 791
 792         hci_conn_del(conn);
 793
 794         /* The suspend notifier is waiting for all devices to disconnect and an
 795          * LE connect cancel will result in an hci_le_conn_failed. Once the last
 796          * connection is deleted, we should also wake the suspend queue to
 797          * complete suspend operations.
 798          */
 799         if (list_empty(&hdev->conn_hash.list) &&
 800             test_and_clear_bit(SUSPEND_DISCONNECTING, hdev->suspend_tasks)) {
 801                 wake_up(&hdev->suspend_wait_q);
 802         }
 803
 804         /* Since we may have temporarily stopped the background scanning in
 805          * favor of connection establishment, we should restart it.
 806          */
 807         hci_update_background_scan(hdev);
 808
 809         /* Re-enable advertising in case this was a failed connection
 810          * attempt as a peripheral.
 811          */
 812         hci_req_reenable_advertising(hdev);
 813 }
 814
 815 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 816 {
 817         struct hci_conn *conn;
 818
 819         hci_dev_lock(hdev);
 820
 821         conn = hci_lookup_le_connect(hdev);
 822
 823         if (hdev->adv_instance_cnt)
 824                 hci_req_resume_adv_instances(hdev);
 825
 826         if (!status) {
 827                 hci_connect_le_scan_cleanup(conn);
 828                 goto done;
 829         }
 830
 831         bt_dev_err(hdev, "request failed to create LE connection: "
 832                    "status 0x%2.2x", status);
 833
 834         if (!conn)
 835                 goto done;
 836
 837         hci_le_conn_failed(conn, status);
 838
 839 done:
 840         hci_dev_unlock(hdev);
 841 }
 842
 843 static bool conn_use_rpa(struct hci_conn *conn)
 844 {
 845         struct hci_dev *hdev = conn->hdev;
 846
 847         return hci_dev_test_flag(hdev, HCI_PRIVACY);
 848 }
 849
 850 static void set_ext_conn_params(struct hci_conn *conn,
 851                                 struct hci_cp_le_ext_conn_param *p)
 852 {
 853         struct hci_dev *hdev = conn->hdev;
 854
 855         memset(p, 0, sizeof(*p));
 856
 857         p->scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
 858         p->scan_window = cpu_to_le16(hdev->le_scan_window_connect);
 859         p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 860         p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 861         p->conn_latency = cpu_to_le16(conn->le_conn_latency);
 862         p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 863         p->min_ce_len = cpu_to_le16(0x0000);
 864         p->max_ce_len = cpu_to_le16(0x0000);
 865 }
 866
 867 static void hci_req_add_le_create_conn(struct hci_request *req,
 868                                        struct hci_conn *conn,
 869                                        bdaddr_t *direct_rpa)
 870 {
 871         struct hci_dev *hdev = conn->hdev;
 872         u8 own_addr_type;
 873
 874         /* If direct address was provided we use it instead of current
 875          * address.
 876          */
 877         if (direct_rpa) {
 878                 if (bacmp(&req->hdev->random_addr, direct_rpa))
 879                         hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
 880                                                                 direct_rpa);
 881
 882                 /* direct address is always RPA */
 883                 own_addr_type = ADDR_LE_DEV_RANDOM;
 884         } else {
 885                 /* Update random address, but set require_privacy to false so
 886                  * that we never connect with an non-resolvable address.
 887                  */
 888                 if (hci_update_random_address(req, false, conn_use_rpa(conn),
 889                                               &own_addr_type))
 890                         return;
 891         }
 892
 893         if (use_ext_conn(hdev)) {
 894                 struct hci_cp_le_ext_create_conn *cp;
 895                 struct hci_cp_le_ext_conn_param *p;
 896                 u8 data[sizeof(*cp) + sizeof(*p) * 3];
 897                 u32 plen;
 898
 899                 cp = (void *) data;
 900                 p = (void *) cp->data;
 901
 902                 memset(cp, 0, sizeof(*cp));
 903
 904                 bacpy(&cp->peer_addr, &conn->dst);
 905                 cp->peer_addr_type = conn->dst_type;
 906                 cp->own_addr_type = own_addr_type;
 907
 908                 plen = sizeof(*cp);
 909
 910                 if (scan_1m(hdev)) {
 911                         cp->phys |= LE_SCAN_PHY_1M;
 912                         set_ext_conn_params(conn, p);
 913
 914                         p++;
 915                         plen += sizeof(*p);
 916                 }
 917
 918                 if (scan_2m(hdev)) {
 919                         cp->phys |= LE_SCAN_PHY_2M;
 920                         set_ext_conn_params(conn, p);
 921
 922                         p++;
 923                         plen += sizeof(*p);
 924                 }
 925
 926                 if (scan_coded(hdev)) {
 927                         cp->phys |= LE_SCAN_PHY_CODED;
 928                         set_ext_conn_params(conn, p);
 929
 930                         plen += sizeof(*p);
 931                 }
 932
 933                 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
 934
 935         } else {
 936                 struct hci_cp_le_create_conn cp;
 937
 938                 memset(&cp, 0, sizeof(cp));
 939
 940                 cp.scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
 941                 cp.scan_window = cpu_to_le16(hdev->le_scan_window_connect);
 942
 943                 bacpy(&cp.peer_addr, &conn->dst);
 944                 cp.peer_addr_type = conn->dst_type;
 945                 cp.own_address_type = own_addr_type;
 946                 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 947                 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 948                 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
 949                 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 950                 cp.min_ce_len = cpu_to_le16(0x0000);
 951                 cp.max_ce_len = cpu_to_le16(0x0000);
 952
 953                 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 954         }
 955
 956         conn->state = BT_CONNECT;
 957         clear_bit(HCI_CONN_SCANNING, &conn->flags);
 958 }
 959
 960 static void hci_req_directed_advertising(struct hci_request *req,
 961                                          struct hci_conn *conn)
 962 {
 963         struct hci_dev *hdev = req->hdev;
 964         u8 own_addr_type;
 965         u8 enable;
 966
 967         if (ext_adv_capable(hdev)) {
 968                 struct hci_cp_le_set_ext_adv_params cp;
 969                 bdaddr_t random_addr;
 970
 971                 /* Set require_privacy to false so that the remote device has a
 972                  * chance of identifying us.
 973                  */
 974                 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
 975                                            &own_addr_type, &random_addr) < 0)
 976                         return;
 977
 978                 memset(&cp, 0, sizeof(cp));
 979
 980                 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
 981                 cp.own_addr_type = own_addr_type;
 982                 cp.channel_map = hdev->le_adv_channel_map;
 983                 cp.tx_power = HCI_TX_POWER_INVALID;
 984                 cp.primary_phy = HCI_ADV_PHY_1M;
 985                 cp.secondary_phy = HCI_ADV_PHY_1M;
 986                 cp.handle = 0; /* Use instance 0 for directed adv */
 987                 cp.own_addr_type = own_addr_type;
 988                 cp.peer_addr_type = conn->dst_type;
 989                 bacpy(&cp.peer_addr, &conn->dst);
 990
 991                 /* As per Core Spec 5.2 Vol 2, PART E, Sec 7.8.53, for
 992                  * advertising_event_property LE_LEGACY_ADV_DIRECT_IND
 993                  * does not supports advertising data when the advertising set already
 994                  * contains some, the controller shall return erroc code 'Invalid
 995                  * HCI Command Parameters(0x12).
 996                  * So it is required to remove adv set for handle 0x00. since we use
 997                  * instance 0 for directed adv.
 998                  */
 999                 __hci_req_remove_ext_adv_instance(req, cp.handle);
1000
1001                 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
1002
1003                 if (own_addr_type == ADDR_LE_DEV_RANDOM &&
1004                     bacmp(&random_addr, BDADDR_ANY) &&
1005                     bacmp(&random_addr, &hdev->random_addr)) {
1006                         struct hci_cp_le_set_adv_set_rand_addr cp;
1007
1008                         memset(&cp, 0, sizeof(cp));
1009
1010                         cp.handle = 0;
1011                         bacpy(&cp.bdaddr, &random_addr);
1012
1013                         hci_req_add(req,
1014                                     HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
1015                                     sizeof(cp), &cp);
1016                 }
1017
1018                 __hci_req_enable_ext_advertising(req, 0x00);
1019         } else {
1020                 struct hci_cp_le_set_adv_param cp;
1021
1022                 /* Clear the HCI_LE_ADV bit temporarily so that the
1023                  * hci_update_random_address knows that it's safe to go ahead
1024                  * and write a new random address. The flag will be set back on
1025                  * as soon as the SET_ADV_ENABLE HCI command completes.
1026                  */
1027                 hci_dev_clear_flag(hdev, HCI_LE_ADV);
1028
1029                 /* Set require_privacy to false so that the remote device has a
1030                  * chance of identifying us.
1031                  */
1032                 if (hci_update_random_address(req, false, conn_use_rpa(conn),
1033                                               &own_addr_type) < 0)
1034                         return;
1035
1036                 memset(&cp, 0, sizeof(cp));
1037
1038                 /* Some controllers might reject command if intervals are not
1039                  * within range for undirected advertising.
1040                  * BCM20702A0 is known to be affected by this.
1041                  */
1042                 cp.min_interval = cpu_to_le16(0x0020);
1043                 cp.max_interval = cpu_to_le16(0x0020);
1044
1045                 cp.type = LE_ADV_DIRECT_IND;
1046                 cp.own_address_type = own_addr_type;
1047                 cp.direct_addr_type = conn->dst_type;
1048                 bacpy(&cp.direct_addr, &conn->dst);
1049                 cp.channel_map = hdev->le_adv_channel_map;
1050
1051                 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
1052
1053                 enable = 0x01;
1054                 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1055                             &enable);
1056         }
1057
1058         conn->state = BT_CONNECT;
1059 }
1060
1061 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1062                                 u8 dst_type, u8 sec_level, u16 conn_timeout,
1063                                 u8 role, bdaddr_t *direct_rpa)
1064 {
1065         struct hci_conn_params *params;
1066         struct hci_conn *conn;
1067         struct smp_irk *irk;
1068         struct hci_request req;
1069         int err;
1070
1071         /* This ensures that during disable le_scan address resolution
1072          * will not be disabled if it is followed by le_create_conn
1073          */
1074         bool rpa_le_conn = true;
1075
1076         /* Let's make sure that le is enabled.*/
1077         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1078                 if (lmp_le_capable(hdev))
1079                         return ERR_PTR(-ECONNREFUSED);
1080
1081                 return ERR_PTR(-EOPNOTSUPP);
1082         }
1083
1084         /* Since the controller supports only one LE connection attempt at a
1085          * time, we return -EBUSY if there is any connection attempt running.
1086          */
1087         if (hci_lookup_le_connect(hdev))
1088                 return ERR_PTR(-EBUSY);
1089
1090         /* If there's already a connection object but it's not in
1091          * scanning state it means it must already be established, in
1092          * which case we can't do anything else except report a failure
1093          * to connect.
1094          */
1095         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1096         if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1097                 return ERR_PTR(-EBUSY);
1098         }
1099
1100         /* When given an identity address with existing identity
1101          * resolving key, the connection needs to be established
1102          * to a resolvable random address.
1103          *
1104          * Storing the resolvable random address is required here
1105          * to handle connection failures. The address will later
1106          * be resolved back into the original identity address
1107          * from the connect request.
1108          */
1109         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1110         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1111                 dst = &irk->rpa;
1112                 dst_type = ADDR_LE_DEV_RANDOM;
1113         }
1114
1115         if (conn) {
1116                 bacpy(&conn->dst, dst);
1117         } else {
1118                 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1119                 if (!conn)
1120                         return ERR_PTR(-ENOMEM);
1121                 hci_conn_hold(conn);
1122                 conn->pending_sec_level = sec_level;
1123         }
1124
1125         conn->dst_type = dst_type;
1126         conn->sec_level = BT_SECURITY_LOW;
1127         conn->conn_timeout = conn_timeout;
1128
1129         hci_req_init(&req, hdev);
1130
1131         /* Disable advertising if we're active. For central role
1132          * connections most controllers will refuse to connect if
1133          * advertising is enabled, and for peripheral role connections we
1134          * anyway have to disable it in order to start directed
1135          * advertising. Any registered advertisements will be
1136          * re-enabled after the connection attempt is finished.
1137          */
1138         if (hci_dev_test_flag(hdev, HCI_LE_ADV))
1139                 __hci_req_pause_adv_instances(&req);
1140
1141         /* If requested to connect as peripheral use directed advertising */
1142         if (conn->role == HCI_ROLE_SLAVE) {
1143                 /* If we're active scanning most controllers are unable
1144                  * to initiate advertising. Simply reject the attempt.
1145                  */
1146                 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1147                     hdev->le_scan_type == LE_SCAN_ACTIVE) {
1148                         hci_req_purge(&req);
1149                         hci_conn_del(conn);
1150                         return ERR_PTR(-EBUSY);
1151                 }
1152
1153                 hci_req_directed_advertising(&req, conn);
1154                 goto create_conn;
1155         }
1156
1157         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1158         if (params) {
1159                 conn->le_conn_min_interval = params->conn_min_interval;
1160                 conn->le_conn_max_interval = params->conn_max_interval;
1161                 conn->le_conn_latency = params->conn_latency;
1162                 conn->le_supv_timeout = params->supervision_timeout;
1163         } else {
1164                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1165                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1166                 conn->le_conn_latency = hdev->le_conn_latency;
1167                 conn->le_supv_timeout = hdev->le_supv_timeout;
1168         }
1169
1170         /* If controller is scanning, we stop it since some controllers are
1171          * not able to scan and connect at the same time. Also set the
1172          * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1173          * handler for scan disabling knows to set the correct discovery
1174          * state.
1175          */
1176         if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1177                 hci_req_add_le_scan_disable(&req, rpa_le_conn);
1178                 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1179         }
1180
1181         hci_req_add_le_create_conn(&req, conn, direct_rpa);
1182
1183 create_conn:
1184         err = hci_req_run(&req, create_le_conn_complete);
1185         if (err) {
1186                 hci_conn_del(conn);
1187
1188                 if (hdev->adv_instance_cnt)
1189                         hci_req_resume_adv_instances(hdev);
1190
1191                 return ERR_PTR(err);
1192         }
1193
1194         return conn;
1195 }
1196
1197 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1198 {
1199         struct hci_conn *conn;
1200
1201         conn = hci_conn_hash_lookup_le(hdev, addr, type);
1202         if (!conn)
1203                 return false;
1204
1205         if (conn->state != BT_CONNECTED)
1206                 return false;
1207
1208         return true;
1209 }
1210
1211 /* This function requires the caller holds hdev->lock */
1212 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1213                                         bdaddr_t *addr, u8 addr_type)
1214 {
1215         struct hci_conn_params *params;
1216
1217         if (is_connected(hdev, addr, addr_type))
1218                 return -EISCONN;
1219
1220         params = hci_conn_params_lookup(hdev, addr, addr_type);
1221         if (!params) {
1222                 params = hci_conn_params_add(hdev, addr, addr_type);
1223                 if (!params)
1224                         return -ENOMEM;
1225
1226                 /* If we created new params, mark them to be deleted in
1227                  * hci_connect_le_scan_cleanup. It's different case than
1228                  * existing disabled params, those will stay after cleanup.
1229                  */
1230                 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1231         }
1232
1233         /* We're trying to connect, so make sure params are at pend_le_conns */
1234         if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1235             params->auto_connect == HCI_AUTO_CONN_REPORT ||
1236             params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1237                 list_del_init(&params->action);
1238                 list_add(&params->action, &hdev->pend_le_conns);
1239         }
1240
1241         params->explicit_connect = true;
1242
1243         BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1244                params->auto_connect);
1245
1246         return 0;
1247 }
1248
1249 /* This function requires the caller holds hdev->lock */
1250 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1251                                      u8 dst_type, u8 sec_level,
1252                                      u16 conn_timeout,
1253                                      enum conn_reasons conn_reason)
1254 {
1255         struct hci_conn *conn;
1256
1257         /* Let's make sure that le is enabled.*/
1258         if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1259                 if (lmp_le_capable(hdev))
1260                         return ERR_PTR(-ECONNREFUSED);
1261
1262                 return ERR_PTR(-EOPNOTSUPP);
1263         }
1264
1265         /* Some devices send ATT messages as soon as the physical link is
1266          * established. To be able to handle these ATT messages, the user-
1267          * space first establishes the connection and then starts the pairing
1268          * process.
1269          *
1270          * So if a hci_conn object already exists for the following connection
1271          * attempt, we simply update pending_sec_level and auth_type fields
1272          * and return the object found.
1273          */
1274         conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1275         if (conn) {
1276                 if (conn->pending_sec_level < sec_level)
1277                         conn->pending_sec_level = sec_level;
1278                 goto done;
1279         }
1280
1281         BT_DBG("requesting refresh of dst_addr");
1282
1283         conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1284         if (!conn)
1285                 return ERR_PTR(-ENOMEM);
1286
1287         if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1288                 hci_conn_del(conn);
1289                 return ERR_PTR(-EBUSY);
1290         }
1291
1292         conn->state = BT_CONNECT;
1293         set_bit(HCI_CONN_SCANNING, &conn->flags);
1294         conn->dst_type = dst_type;
1295         conn->sec_level = BT_SECURITY_LOW;
1296         conn->pending_sec_level = sec_level;
1297         conn->conn_timeout = conn_timeout;
1298         conn->conn_reason = conn_reason;
1299
1300         hci_update_background_scan(hdev);
1301
1302 done:
1303         hci_conn_hold(conn);
1304         return conn;
1305 }
1306
1307 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1308                                  u8 sec_level, u8 auth_type,
1309                                  enum conn_reasons conn_reason)
1310 {
1311         struct hci_conn *acl;
1312
1313         if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1314                 if (lmp_bredr_capable(hdev))
1315                         return ERR_PTR(-ECONNREFUSED);
1316
1317                 return ERR_PTR(-EOPNOTSUPP);
1318         }
1319
1320         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1321         if (!acl) {
1322                 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1323                 if (!acl)
1324                         return ERR_PTR(-ENOMEM);
1325         }
1326
1327         hci_conn_hold(acl);
1328
1329         acl->conn_reason = conn_reason;
1330         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1331                 acl->sec_level = BT_SECURITY_LOW;
1332                 acl->pending_sec_level = sec_level;
1333                 acl->auth_type = auth_type;
1334                 hci_acl_create_connection(acl);
1335         }
1336
1337         return acl;
1338 }
1339
1340 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1341                                  __u16 setting)
1342 {
1343         struct hci_conn *acl;
1344         struct hci_conn *sco;
1345
1346         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1347                               CONN_REASON_SCO_CONNECT);
1348         if (IS_ERR(acl))
1349                 return acl;
1350
1351         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1352         if (!sco) {
1353                 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1354                 if (!sco) {
1355                         hci_conn_drop(acl);
1356                         return ERR_PTR(-ENOMEM);
1357                 }
1358         }
1359
1360         acl->link = sco;
1361         sco->link = acl;
1362
1363         hci_conn_hold(sco);
1364
1365         sco->setting = setting;
1366
1367         if (acl->state == BT_CONNECTED &&
1368             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1369                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1370                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1371
1372                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1373                         /* defer SCO setup until mode change completed */
1374                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1375                         return sco;
1376                 }
1377
1378                 hci_sco_setup(acl, 0x00);
1379         }
1380
1381         return sco;
1382 }
1383
1384 /* Check link security requirement */
1385 int hci_conn_check_link_mode(struct hci_conn *conn)
1386 {
1387         BT_DBG("hcon %p", conn);
1388
1389         /* In Secure Connections Only mode, it is required that Secure
1390          * Connections is used and the link is encrypted with AES-CCM
1391          * using a P-256 authenticated combination key.
1392          */
1393         if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1394                 if (!hci_conn_sc_enabled(conn) ||
1395                     !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1396                     conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1397                         return 0;
1398         }
1399
1400          /* AES encryption is required for Level 4:
1401           *
1402           * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
1403           * page 1319:
1404           *
1405           * 128-bit equivalent strength for link and encryption keys
1406           * required using FIPS approved algorithms (E0 not allowed,
1407           * SAFER+ not allowed, and P-192 not allowed; encryption key
1408           * not shortened)
1409           */
1410         if (conn->sec_level == BT_SECURITY_FIPS &&
1411             !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
1412                 bt_dev_err(conn->hdev,
1413                            "Invalid security: Missing AES-CCM usage");
1414                 return 0;
1415         }
1416
1417         if (hci_conn_ssp_enabled(conn) &&
1418             !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1419                 return 0;
1420
1421         return 1;
1422 }
1423
1424 /* Authenticate remote device */
1425 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1426 {
1427         BT_DBG("hcon %p", conn);
1428
1429         if (conn->pending_sec_level > sec_level)
1430                 sec_level = conn->pending_sec_level;
1431
1432         if (sec_level > conn->sec_level)
1433                 conn->pending_sec_level = sec_level;
1434         else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1435                 return 1;
1436
1437         /* Make sure we preserve an existing MITM requirement*/
1438         auth_type |= (conn->auth_type & 0x01);
1439
1440         conn->auth_type = auth_type;
1441
1442         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1443                 struct hci_cp_auth_requested cp;
1444
1445                 cp.handle = cpu_to_le16(conn->handle);
1446                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1447                              sizeof(cp), &cp);
1448
1449                 /* If we're already encrypted set the REAUTH_PEND flag,
1450                  * otherwise set the ENCRYPT_PEND.
1451                  */
1452                 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1453                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1454                 else
1455                         set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1456         }
1457
1458         return 0;
1459 }
1460
1461 /* Encrypt the link */
1462 static void hci_conn_encrypt(struct hci_conn *conn)
1463 {
1464         BT_DBG("hcon %p", conn);
1465
1466         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1467                 struct hci_cp_set_conn_encrypt cp;
1468                 cp.handle  = cpu_to_le16(conn->handle);
1469                 cp.encrypt = 0x01;
1470                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1471                              &cp);
1472         }
1473 }
1474
1475 /* Enable security */
1476 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1477                       bool initiator)
1478 {
1479         BT_DBG("hcon %p", conn);
1480
1481         if (conn->type == LE_LINK)
1482                 return smp_conn_security(conn, sec_level);
1483
1484         /* For sdp we don't need the link key. */
1485         if (sec_level == BT_SECURITY_SDP)
1486                 return 1;
1487
1488         /* For non 2.1 devices and low security level we don't need the link
1489            key. */
1490         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1491                 return 1;
1492
1493         /* For other security levels we need the link key. */
1494         if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1495                 goto auth;
1496
1497         /* An authenticated FIPS approved combination key has sufficient
1498          * security for security level 4. */
1499         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1500             sec_level == BT_SECURITY_FIPS)
1501                 goto encrypt;
1502
1503         /* An authenticated combination key has sufficient security for
1504            security level 3. */
1505         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1506              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1507             sec_level == BT_SECURITY_HIGH)
1508                 goto encrypt;
1509
1510         /* An unauthenticated combination key has sufficient security for
1511            security level 1 and 2. */
1512         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1513              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1514             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1515                 goto encrypt;
1516
1517         /* A combination key has always sufficient security for the security
1518            levels 1 or 2. High security level requires the combination key
1519            is generated using maximum PIN code length (16).
1520            For pre 2.1 units. */
1521         if (conn->key_type == HCI_LK_COMBINATION &&
1522             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1523              conn->pin_length == 16))
1524                 goto encrypt;
1525
1526 auth:
1527         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1528                 return 0;
1529
1530         if (initiator)
1531                 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1532
1533         if (!hci_conn_auth(conn, sec_level, auth_type))
1534                 return 0;
1535
1536 encrypt:
1537         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1538                 /* Ensure that the encryption key size has been read,
1539                  * otherwise stall the upper layer responses.
1540                  */
1541                 if (!conn->enc_key_size)
1542                         return 0;
1543
1544                 /* Nothing else needed, all requirements are met */
1545                 return 1;
1546         }
1547
1548         hci_conn_encrypt(conn);
1549         return 0;
1550 }
1551 EXPORT_SYMBOL(hci_conn_security);
1552
1553 /* Check secure link requirement */
1554 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1555 {
1556         BT_DBG("hcon %p", conn);
1557
1558         /* Accept if non-secure or higher security level is required */
1559         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1560                 return 1;
1561
1562         /* Accept if secure or higher security level is already present */
1563         if (conn->sec_level == BT_SECURITY_HIGH ||
1564             conn->sec_level == BT_SECURITY_FIPS)
1565                 return 1;
1566
1567         /* Reject not secure link */
1568         return 0;
1569 }
1570 EXPORT_SYMBOL(hci_conn_check_secure);
1571
1572 /* Switch role */
1573 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1574 {
1575         BT_DBG("hcon %p", conn);
1576
1577         if (role == conn->role)
1578                 return 1;
1579
1580         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1581                 struct hci_cp_switch_role cp;
1582                 bacpy(&cp.bdaddr, &conn->dst);
1583                 cp.role = role;
1584                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1585         }
1586
1587         return 0;
1588 }
1589 EXPORT_SYMBOL(hci_conn_switch_role);
1590
1591 /* Enter active mode */
1592 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1593 {
1594         struct hci_dev *hdev = conn->hdev;
1595
1596         BT_DBG("hcon %p mode %d", conn, conn->mode);
1597
1598         if (conn->mode != HCI_CM_SNIFF)
1599                 goto timer;
1600
1601         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1602                 goto timer;
1603
1604         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1605                 struct hci_cp_exit_sniff_mode cp;
1606                 cp.handle = cpu_to_le16(conn->handle);
1607                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1608         }
1609
1610 timer:
1611         if (hdev->idle_timeout > 0)
1612                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1613                                    msecs_to_jiffies(hdev->idle_timeout));
1614 }
1615
1616 /* Drop all connection on the device */
1617 void hci_conn_hash_flush(struct hci_dev *hdev)
1618 {
1619         struct hci_conn_hash *h = &hdev->conn_hash;
1620         struct hci_conn *c, *n;
1621
1622         BT_DBG("hdev %s", hdev->name);
1623
1624         list_for_each_entry_safe(c, n, &h->list, list) {
1625                 c->state = BT_CLOSED;
1626
1627                 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1628                 hci_conn_del(c);
1629         }
1630 }
1631
1632 /* Check pending connect attempts */
1633 void hci_conn_check_pending(struct hci_dev *hdev)
1634 {
1635         struct hci_conn *conn;
1636
1637         BT_DBG("hdev %s", hdev->name);
1638
1639         hci_dev_lock(hdev);
1640
1641         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1642         if (conn)
1643                 hci_acl_create_connection(conn);
1644
1645         hci_dev_unlock(hdev);
1646 }
1647
1648 static u32 get_link_mode(struct hci_conn *conn)
1649 {
1650         u32 link_mode = 0;
1651
1652         if (conn->role == HCI_ROLE_MASTER)
1653                 link_mode |= HCI_LM_MASTER;
1654
1655         if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1656                 link_mode |= HCI_LM_ENCRYPT;
1657
1658         if (test_bit(HCI_CONN_AUTH, &conn->flags))
1659                 link_mode |= HCI_LM_AUTH;
1660
1661         if (test_bit(HCI_CONN_SECURE, &conn->flags))
1662                 link_mode |= HCI_LM_SECURE;
1663
1664         if (test_bit(HCI_CONN_FIPS, &conn->flags))
1665                 link_mode |= HCI_LM_FIPS;
1666
1667         return link_mode;
1668 }
1669
1670 int hci_get_conn_list(void __user *arg)
1671 {
1672         struct hci_conn *c;
1673         struct hci_conn_list_req req, *cl;
1674         struct hci_conn_info *ci;
1675         struct hci_dev *hdev;
1676         int n = 0, size, err;
1677
1678         if (copy_from_user(&req, arg, sizeof(req)))
1679                 return -EFAULT;
1680
1681         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1682                 return -EINVAL;
1683
1684         size = sizeof(req) + req.conn_num * sizeof(*ci);
1685
1686         cl = kmalloc(size, GFP_KERNEL);
1687         if (!cl)
1688                 return -ENOMEM;
1689
1690         hdev = hci_dev_get(req.dev_id);
1691         if (!hdev) {
1692                 kfree(cl);
1693                 return -ENODEV;
1694         }
1695
1696         ci = cl->conn_info;
1697
1698         hci_dev_lock(hdev);
1699         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1700                 bacpy(&(ci + n)->bdaddr, &c->dst);
1701                 (ci + n)->handle = c->handle;
1702                 (ci + n)->type  = c->type;
1703                 (ci + n)->out   = c->out;
1704                 (ci + n)->state = c->state;
1705                 (ci + n)->link_mode = get_link_mode(c);
1706                 if (++n >= req.conn_num)
1707                         break;
1708         }
1709         hci_dev_unlock(hdev);
1710
1711         cl->dev_id = hdev->id;
1712         cl->conn_num = n;
1713         size = sizeof(req) + n * sizeof(*ci);
1714
1715         hci_dev_put(hdev);
1716
1717         err = copy_to_user(arg, cl, size);
1718         kfree(cl);
1719
1720         return err ? -EFAULT : 0;
1721 }
1722
1723 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1724 {
1725         struct hci_conn_info_req req;
1726         struct hci_conn_info ci;
1727         struct hci_conn *conn;
1728         char __user *ptr = arg + sizeof(req);
1729
1730         if (copy_from_user(&req, arg, sizeof(req)))
1731                 return -EFAULT;
1732
1733         hci_dev_lock(hdev);
1734         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1735         if (conn) {
1736                 bacpy(&ci.bdaddr, &conn->dst);
1737                 ci.handle = conn->handle;
1738                 ci.type  = conn->type;
1739                 ci.out   = conn->out;
1740                 ci.state = conn->state;
1741                 ci.link_mode = get_link_mode(conn);
1742         }
1743         hci_dev_unlock(hdev);
1744
1745         if (!conn)
1746                 return -ENOENT;
1747
1748         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1749 }
1750
1751 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1752 {
1753         struct hci_auth_info_req req;
1754         struct hci_conn *conn;
1755
1756         if (copy_from_user(&req, arg, sizeof(req)))
1757                 return -EFAULT;
1758
1759         hci_dev_lock(hdev);
1760         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1761         if (conn)
1762                 req.type = conn->auth_type;
1763         hci_dev_unlock(hdev);
1764
1765         if (!conn)
1766                 return -ENOENT;
1767
1768         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1769 }
1770
1771 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1772 {
1773         struct hci_dev *hdev = conn->hdev;
1774         struct hci_chan *chan;
1775
1776         BT_DBG("%s hcon %p", hdev->name, conn);
1777
1778         if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1779                 BT_DBG("Refusing to create new hci_chan");
1780                 return NULL;
1781         }
1782
1783         chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1784         if (!chan)
1785                 return NULL;
1786
1787         chan->conn = hci_conn_get(conn);
1788         skb_queue_head_init(&chan->data_q);
1789         chan->state = BT_CONNECTED;
1790
1791         list_add_rcu(&chan->list, &conn->chan_list);
1792
1793         return chan;
1794 }
1795
1796 void hci_chan_del(struct hci_chan *chan)
1797 {
1798         struct hci_conn *conn = chan->conn;
1799         struct hci_dev *hdev = conn->hdev;
1800
1801         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1802
1803         list_del_rcu(&chan->list);
1804
1805         synchronize_rcu();
1806
1807         /* Prevent new hci_chan's to be created for this hci_conn */
1808         set_bit(HCI_CONN_DROP, &conn->flags);
1809
1810         hci_conn_put(conn);
1811
1812         skb_queue_purge(&chan->data_q);
1813         kfree(chan);
1814 }
1815
1816 void hci_chan_list_flush(struct hci_conn *conn)
1817 {
1818         struct hci_chan *chan, *n;
1819
1820         BT_DBG("hcon %p", conn);
1821
1822         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1823                 hci_chan_del(chan);
1824 }
1825
1826 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1827                                                  __u16 handle)
1828 {
1829         struct hci_chan *hchan;
1830
1831         list_for_each_entry(hchan, &hcon->chan_list, list) {
1832                 if (hchan->handle == handle)
1833                         return hchan;
1834         }
1835
1836         return NULL;
1837 }
1838
1839 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1840 {
1841         struct hci_conn_hash *h = &hdev->conn_hash;
1842         struct hci_conn *hcon;
1843         struct hci_chan *hchan = NULL;
1844
1845         rcu_read_lock();
1846
1847         list_for_each_entry_rcu(hcon, &h->list, list) {
1848                 hchan = __hci_chan_lookup_handle(hcon, handle);
1849                 if (hchan)
1850                         break;
1851         }
1852
1853         rcu_read_unlock();
1854
1855         return hchan;
1856 }
1857
1858 u32 hci_conn_get_phy(struct hci_conn *conn)
1859 {
1860         u32 phys = 0;
1861
1862         /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
1863          * Table 6.2: Packets defined for synchronous, asynchronous, and
1864          * CPB logical transport types.
1865          */
1866         switch (conn->type) {
1867         case SCO_LINK:
1868                 /* SCO logical transport (1 Mb/s):
1869                  * HV1, HV2, HV3 and DV.
1870                  */
1871                 phys |= BT_PHY_BR_1M_1SLOT;
1872
1873                 break;
1874
1875         case ACL_LINK:
1876                 /* ACL logical transport (1 Mb/s) ptt=0:
1877                  * DH1, DM3, DH3, DM5 and DH5.
1878                  */
1879                 phys |= BT_PHY_BR_1M_1SLOT;
1880
1881                 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
1882                         phys |= BT_PHY_BR_1M_3SLOT;
1883
1884                 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
1885                         phys |= BT_PHY_BR_1M_5SLOT;
1886
1887                 /* ACL logical transport (2 Mb/s) ptt=1:
1888                  * 2-DH1, 2-DH3 and 2-DH5.
1889                  */
1890                 if (!(conn->pkt_type & HCI_2DH1))
1891                         phys |= BT_PHY_EDR_2M_1SLOT;
1892
1893                 if (!(conn->pkt_type & HCI_2DH3))
1894                         phys |= BT_PHY_EDR_2M_3SLOT;
1895
1896                 if (!(conn->pkt_type & HCI_2DH5))
1897                         phys |= BT_PHY_EDR_2M_5SLOT;
1898
1899                 /* ACL logical transport (3 Mb/s) ptt=1:
1900                  * 3-DH1, 3-DH3 and 3-DH5.
1901                  */
1902                 if (!(conn->pkt_type & HCI_3DH1))
1903                         phys |= BT_PHY_EDR_3M_1SLOT;
1904
1905                 if (!(conn->pkt_type & HCI_3DH3))
1906                         phys |= BT_PHY_EDR_3M_3SLOT;
1907
1908                 if (!(conn->pkt_type & HCI_3DH5))
1909                         phys |= BT_PHY_EDR_3M_5SLOT;
1910
1911                 break;
1912
1913         case ESCO_LINK:
1914                 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
1915                 phys |= BT_PHY_BR_1M_1SLOT;
1916
1917                 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
1918                         phys |= BT_PHY_BR_1M_3SLOT;
1919
1920                 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
1921                 if (!(conn->pkt_type & ESCO_2EV3))
1922                         phys |= BT_PHY_EDR_2M_1SLOT;
1923
1924                 if (!(conn->pkt_type & ESCO_2EV5))
1925                         phys |= BT_PHY_EDR_2M_3SLOT;
1926
1927                 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
1928                 if (!(conn->pkt_type & ESCO_3EV3))
1929                         phys |= BT_PHY_EDR_3M_1SLOT;
1930
1931                 if (!(conn->pkt_type & ESCO_3EV5))
1932                         phys |= BT_PHY_EDR_3M_3SLOT;
1933
1934                 break;
1935
1936         case LE_LINK:
1937                 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
1938                         phys |= BT_PHY_LE_1M_TX;
1939
1940                 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
1941                         phys |= BT_PHY_LE_1M_RX;
1942
1943                 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
1944                         phys |= BT_PHY_LE_2M_TX;
1945
1946                 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
1947                         phys |= BT_PHY_LE_2M_RX;
1948
1949                 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
1950                         phys |= BT_PHY_LE_CODED_TX;
1951
1952                 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
1953                         phys |= BT_PHY_LE_CODED_RX;
1954
1955                 break;
1956         }
1957
1958         return phys;
1959 }