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