net/bluetooth/hci_conn.c

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