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
  29 #include <net/bluetooth/bluetooth.h>
  30 #include <net/bluetooth/hci_core.h>
  31
  32 #include "smp.h"
  33 #include "a2mp.h"
  34
  35 struct sco_param {
  36         u16 pkt_type;
  37         u16 max_latency;
  38 };
  39
  40 static const struct sco_param sco_param_cvsd[] = {
  41         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a }, /* S3 */
  42         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007 }, /* S2 */
  43         { EDR_ESCO_MASK | ESCO_EV3,   0x0007 }, /* S1 */
  44         { EDR_ESCO_MASK | ESCO_HV3,   0xffff }, /* D1 */
  45         { EDR_ESCO_MASK | ESCO_HV1,   0xffff }, /* D0 */
  46 };
  47
  48 static const struct sco_param sco_param_wideband[] = {
  49         { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d }, /* T2 */
  50         { EDR_ESCO_MASK | ESCO_EV3,   0x0008 }, /* T1 */
  51 };
  52
  53 static void hci_le_create_connection_cancel(struct hci_conn *conn)
  54 {
  55         hci_send_cmd(conn->hdev, HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL);
  56 }
  57
  58 static void hci_acl_create_connection(struct hci_conn *conn)
  59 {
  60         struct hci_dev *hdev = conn->hdev;
  61         struct inquiry_entry *ie;
  62         struct hci_cp_create_conn cp;
  63
  64         BT_DBG("hcon %p", conn);
  65
  66         conn->state = BT_CONNECT;
  67         conn->out = true;
  68
  69         conn->link_mode = HCI_LM_MASTER;
  70
  71         conn->attempt++;
  72
  73         conn->link_policy = hdev->link_policy;
  74
  75         memset(&cp, 0, sizeof(cp));
  76         bacpy(&cp.bdaddr, &conn->dst);
  77         cp.pscan_rep_mode = 0x02;
  78
  79         ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
  80         if (ie) {
  81                 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
  82                         cp.pscan_rep_mode = ie->data.pscan_rep_mode;
  83                         cp.pscan_mode     = ie->data.pscan_mode;
  84                         cp.clock_offset   = ie->data.clock_offset |
  85                                             __constant_cpu_to_le16(0x8000);
  86                 }
  87
  88                 memcpy(conn->dev_class, ie->data.dev_class, 3);
  89                 if (ie->data.ssp_mode > 0)
  90                         set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
  91         }
  92
  93         cp.pkt_type = cpu_to_le16(conn->pkt_type);
  94         if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
  95                 cp.role_switch = 0x01;
  96         else
  97                 cp.role_switch = 0x00;
  98
  99         hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
 100 }
 101
 102 static void hci_acl_create_connection_cancel(struct hci_conn *conn)
 103 {
 104         struct hci_cp_create_conn_cancel cp;
 105
 106         BT_DBG("hcon %p", conn);
 107
 108         if (conn->hdev->hci_ver < BLUETOOTH_VER_1_2)
 109                 return;
 110
 111         bacpy(&cp.bdaddr, &conn->dst);
 112         hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
 113 }
 114
 115 static void hci_reject_sco(struct hci_conn *conn)
 116 {
 117         struct hci_cp_reject_sync_conn_req cp;
 118
 119         cp.reason = HCI_ERROR_REMOTE_USER_TERM;
 120         bacpy(&cp.bdaddr, &conn->dst);
 121
 122         hci_send_cmd(conn->hdev, HCI_OP_REJECT_SYNC_CONN_REQ, sizeof(cp), &cp);
 123 }
 124
 125 void hci_disconnect(struct hci_conn *conn, __u8 reason)
 126 {
 127         struct hci_cp_disconnect cp;
 128
 129         BT_DBG("hcon %p", conn);
 130
 131         conn->state = BT_DISCONN;
 132
 133         cp.handle = cpu_to_le16(conn->handle);
 134         cp.reason = reason;
 135         hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
 136 }
 137
 138 static void hci_amp_disconn(struct hci_conn *conn, __u8 reason)
 139 {
 140         struct hci_cp_disconn_phy_link cp;
 141
 142         BT_DBG("hcon %p", conn);
 143
 144         conn->state = BT_DISCONN;
 145
 146         cp.phy_handle = HCI_PHY_HANDLE(conn->handle);
 147         cp.reason = reason;
 148         hci_send_cmd(conn->hdev, HCI_OP_DISCONN_PHY_LINK,
 149                      sizeof(cp), &cp);
 150 }
 151
 152 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
 153 {
 154         struct hci_dev *hdev = conn->hdev;
 155         struct hci_cp_add_sco cp;
 156
 157         BT_DBG("hcon %p", conn);
 158
 159         conn->state = BT_CONNECT;
 160         conn->out = true;
 161
 162         conn->attempt++;
 163
 164         cp.handle   = cpu_to_le16(handle);
 165         cp.pkt_type = cpu_to_le16(conn->pkt_type);
 166
 167         hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 168 }
 169
 170 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
 171 {
 172         struct hci_dev *hdev = conn->hdev;
 173         struct hci_cp_setup_sync_conn cp;
 174         const struct sco_param *param;
 175
 176         BT_DBG("hcon %p", conn);
 177
 178         conn->state = BT_CONNECT;
 179         conn->out = true;
 180
 181         conn->attempt++;
 182
 183         cp.handle   = cpu_to_le16(handle);
 184
 185         cp.tx_bandwidth   = __constant_cpu_to_le32(0x00001f40);
 186         cp.rx_bandwidth   = __constant_cpu_to_le32(0x00001f40);
 187         cp.voice_setting  = cpu_to_le16(conn->setting);
 188
 189         switch (conn->setting & SCO_AIRMODE_MASK) {
 190         case SCO_AIRMODE_TRANSP:
 191                 if (conn->attempt > ARRAY_SIZE(sco_param_wideband))
 192                         return false;
 193                 cp.retrans_effort = 0x02;
 194                 param = &sco_param_wideband[conn->attempt - 1];
 195                 break;
 196         case SCO_AIRMODE_CVSD:
 197                 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
 198                         return false;
 199                 cp.retrans_effort = 0x01;
 200                 param = &sco_param_cvsd[conn->attempt - 1];
 201                 break;
 202         default:
 203                 return false;
 204         }
 205
 206         cp.pkt_type = __cpu_to_le16(param->pkt_type);
 207         cp.max_latency = __cpu_to_le16(param->max_latency);
 208
 209         if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
 210                 return false;
 211
 212         return true;
 213 }
 214
 215 void hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max,
 216                         u16 latency, u16 to_multiplier)
 217 {
 218         struct hci_cp_le_conn_update cp;
 219         struct hci_dev *hdev = conn->hdev;
 220
 221         memset(&cp, 0, sizeof(cp));
 222
 223         cp.handle               = cpu_to_le16(conn->handle);
 224         cp.conn_interval_min    = cpu_to_le16(min);
 225         cp.conn_interval_max    = cpu_to_le16(max);
 226         cp.conn_latency         = cpu_to_le16(latency);
 227         cp.supervision_timeout  = cpu_to_le16(to_multiplier);
 228         cp.min_ce_len           = __constant_cpu_to_le16(0x0000);
 229         cp.max_ce_len           = __constant_cpu_to_le16(0x0000);
 230
 231         hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
 232 }
 233
 234 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
 235                       __u8 ltk[16])
 236 {
 237         struct hci_dev *hdev = conn->hdev;
 238         struct hci_cp_le_start_enc cp;
 239
 240         BT_DBG("hcon %p", conn);
 241
 242         memset(&cp, 0, sizeof(cp));
 243
 244         cp.handle = cpu_to_le16(conn->handle);
 245         cp.rand = rand;
 246         cp.ediv = ediv;
 247         memcpy(cp.ltk, ltk, sizeof(cp.ltk));
 248
 249         hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
 250 }
 251
 252 /* Device _must_ be locked */
 253 void hci_sco_setup(struct hci_conn *conn, __u8 status)
 254 {
 255         struct hci_conn *sco = conn->link;
 256
 257         if (!sco)
 258                 return;
 259
 260         BT_DBG("hcon %p", conn);
 261
 262         if (!status) {
 263                 if (lmp_esco_capable(conn->hdev))
 264                         hci_setup_sync(sco, conn->handle);
 265                 else
 266                         hci_add_sco(sco, conn->handle);
 267         } else {
 268                 hci_proto_connect_cfm(sco, status);
 269                 hci_conn_del(sco);
 270         }
 271 }
 272
 273 static void hci_conn_disconnect(struct hci_conn *conn)
 274 {
 275         __u8 reason = hci_proto_disconn_ind(conn);
 276
 277         switch (conn->type) {
 278         case AMP_LINK:
 279                 hci_amp_disconn(conn, reason);
 280                 break;
 281         default:
 282                 hci_disconnect(conn, reason);
 283                 break;
 284         }
 285 }
 286
 287 static void hci_conn_timeout(struct work_struct *work)
 288 {
 289         struct hci_conn *conn = container_of(work, struct hci_conn,
 290                                              disc_work.work);
 291
 292         BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
 293
 294         if (atomic_read(&conn->refcnt))
 295                 return;
 296
 297         switch (conn->state) {
 298         case BT_CONNECT:
 299         case BT_CONNECT2:
 300                 if (conn->out) {
 301                         if (conn->type == ACL_LINK)
 302                                 hci_acl_create_connection_cancel(conn);
 303                         else if (conn->type == LE_LINK)
 304                                 hci_le_create_connection_cancel(conn);
 305                 } else if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
 306                         hci_reject_sco(conn);
 307                 }
 308                 break;
 309         case BT_CONFIG:
 310         case BT_CONNECTED:
 311                 hci_conn_disconnect(conn);
 312                 break;
 313         default:
 314                 conn->state = BT_CLOSED;
 315                 break;
 316         }
 317 }
 318
 319 /* Enter sniff mode */
 320 static void hci_conn_idle(struct work_struct *work)
 321 {
 322         struct hci_conn *conn = container_of(work, struct hci_conn,
 323                                              idle_work.work);
 324         struct hci_dev *hdev = conn->hdev;
 325
 326         BT_DBG("hcon %p mode %d", conn, conn->mode);
 327
 328         if (test_bit(HCI_RAW, &hdev->flags))
 329                 return;
 330
 331         if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 332                 return;
 333
 334         if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 335                 return;
 336
 337         if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 338                 struct hci_cp_sniff_subrate cp;
 339                 cp.handle             = cpu_to_le16(conn->handle);
 340                 cp.max_latency        = __constant_cpu_to_le16(0);
 341                 cp.min_remote_timeout = __constant_cpu_to_le16(0);
 342                 cp.min_local_timeout  = __constant_cpu_to_le16(0);
 343                 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 344         }
 345
 346         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 347                 struct hci_cp_sniff_mode cp;
 348                 cp.handle       = cpu_to_le16(conn->handle);
 349                 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 350                 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 351                 cp.attempt      = __constant_cpu_to_le16(4);
 352                 cp.timeout      = __constant_cpu_to_le16(1);
 353                 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 354         }
 355 }
 356
 357 static void hci_conn_auto_accept(struct work_struct *work)
 358 {
 359         struct hci_conn *conn = container_of(work, struct hci_conn,
 360                                              auto_accept_work.work);
 361
 362         hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
 363                      &conn->dst);
 364 }
 365
 366 static void le_conn_timeout(struct work_struct *work)
 367 {
 368         struct hci_conn *conn = container_of(work, struct hci_conn,
 369                                              le_conn_timeout.work);
 370
 371         BT_DBG("");
 372
 373         hci_le_create_connection_cancel(conn);
 374 }
 375
 376 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 377 {
 378         struct hci_conn *conn;
 379
 380         BT_DBG("%s dst %pMR", hdev->name, dst);
 381
 382         conn = kzalloc(sizeof(struct hci_conn), GFP_KERNEL);
 383         if (!conn)
 384                 return NULL;
 385
 386         bacpy(&conn->dst, dst);
 387         bacpy(&conn->src, &hdev->bdaddr);
 388         conn->hdev  = hdev;
 389         conn->type  = type;
 390         conn->mode  = HCI_CM_ACTIVE;
 391         conn->state = BT_OPEN;
 392         conn->auth_type = HCI_AT_GENERAL_BONDING;
 393         conn->io_capability = hdev->io_capability;
 394         conn->remote_auth = 0xff;
 395         conn->key_type = 0xff;
 396
 397         set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
 398         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 399
 400         switch (type) {
 401         case ACL_LINK:
 402                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 403                 break;
 404         case SCO_LINK:
 405                 if (lmp_esco_capable(hdev))
 406                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 407                                         (hdev->esco_type & EDR_ESCO_MASK);
 408                 else
 409                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 410                 break;
 411         case ESCO_LINK:
 412                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 413                 break;
 414         }
 415
 416         skb_queue_head_init(&conn->data_q);
 417
 418         INIT_LIST_HEAD(&conn->chan_list);
 419
 420         INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
 421         INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
 422         INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
 423         INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
 424
 425         atomic_set(&conn->refcnt, 0);
 426
 427         hci_dev_hold(hdev);
 428
 429         hci_conn_hash_add(hdev, conn);
 430         if (hdev->notify)
 431                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 432
 433         hci_conn_init_sysfs(conn);
 434
 435         return conn;
 436 }
 437
 438 int hci_conn_del(struct hci_conn *conn)
 439 {
 440         struct hci_dev *hdev = conn->hdev;
 441
 442         BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
 443
 444         cancel_delayed_work_sync(&conn->disc_work);
 445         cancel_delayed_work_sync(&conn->auto_accept_work);
 446         cancel_delayed_work_sync(&conn->idle_work);
 447
 448         if (conn->type == ACL_LINK) {
 449                 struct hci_conn *sco = conn->link;
 450                 if (sco)
 451                         sco->link = NULL;
 452
 453                 /* Unacked frames */
 454                 hdev->acl_cnt += conn->sent;
 455         } else if (conn->type == LE_LINK) {
 456                 cancel_delayed_work_sync(&conn->le_conn_timeout);
 457
 458                 if (hdev->le_pkts)
 459                         hdev->le_cnt += conn->sent;
 460                 else
 461                         hdev->acl_cnt += conn->sent;
 462         } else {
 463                 struct hci_conn *acl = conn->link;
 464                 if (acl) {
 465                         acl->link = NULL;
 466                         hci_conn_drop(acl);
 467                 }
 468         }
 469
 470         hci_chan_list_flush(conn);
 471
 472         if (conn->amp_mgr)
 473                 amp_mgr_put(conn->amp_mgr);
 474
 475         hci_conn_hash_del(hdev, conn);
 476         if (hdev->notify)
 477                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 478
 479         skb_queue_purge(&conn->data_q);
 480
 481         hci_conn_del_sysfs(conn);
 482
 483         hci_dev_put(hdev);
 484
 485         hci_conn_put(conn);
 486
 487         return 0;
 488 }
 489
 490 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
 491 {
 492         int use_src = bacmp(src, BDADDR_ANY);
 493         struct hci_dev *hdev = NULL, *d;
 494
 495         BT_DBG("%pMR -> %pMR", src, dst);
 496
 497         read_lock(&hci_dev_list_lock);
 498
 499         list_for_each_entry(d, &hci_dev_list, list) {
 500                 if (!test_bit(HCI_UP, &d->flags) ||
 501                     test_bit(HCI_RAW, &d->flags) ||
 502                     test_bit(HCI_USER_CHANNEL, &d->dev_flags) ||
 503                     d->dev_type != HCI_BREDR)
 504                         continue;
 505
 506                 /* Simple routing:
 507                  *   No source address - find interface with bdaddr != dst
 508                  *   Source address    - find interface with bdaddr == src
 509                  */
 510
 511                 if (use_src) {
 512                         if (!bacmp(&d->bdaddr, src)) {
 513                                 hdev = d; break;
 514                         }
 515                 } else {
 516                         if (bacmp(&d->bdaddr, dst)) {
 517                                 hdev = d; break;
 518                         }
 519                 }
 520         }
 521
 522         if (hdev)
 523                 hdev = hci_dev_hold(hdev);
 524
 525         read_unlock(&hci_dev_list_lock);
 526         return hdev;
 527 }
 528 EXPORT_SYMBOL(hci_get_route);
 529
 530 /* This function requires the caller holds hdev->lock */
 531 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 532 {
 533         struct hci_dev *hdev = conn->hdev;
 534
 535         conn->state = BT_CLOSED;
 536
 537         mgmt_connect_failed(hdev, &conn->dst, conn->type, conn->dst_type,
 538                             status);
 539
 540         hci_proto_connect_cfm(conn, status);
 541
 542         hci_conn_del(conn);
 543
 544         /* Since we may have temporarily stopped the background scanning in
 545          * favor of connection establishment, we should restart it.
 546          */
 547         hci_update_background_scan(hdev);
 548 }
 549
 550 static void create_le_conn_complete(struct hci_dev *hdev, u8 status)
 551 {
 552         struct hci_conn *conn;
 553
 554         if (status == 0)
 555                 return;
 556
 557         BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
 558                status);
 559
 560         hci_dev_lock(hdev);
 561
 562         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 563         if (!conn)
 564                 goto done;
 565
 566         hci_le_conn_failed(conn, status);
 567
 568 done:
 569         hci_dev_unlock(hdev);
 570 }
 571
 572 static void hci_req_add_le_create_conn(struct hci_request *req,
 573                                        struct hci_conn *conn)
 574 {
 575         struct hci_cp_le_create_conn cp;
 576         struct hci_dev *hdev = conn->hdev;
 577         u8 own_addr_type;
 578
 579         memset(&cp, 0, sizeof(cp));
 580
 581         /* Update random address, but set require_privacy to false so
 582          * that we never connect with an unresolvable address.
 583          */
 584         if (hci_update_random_address(req, false, &own_addr_type))
 585                 return;
 586
 587         /* Save the address type used for this connnection attempt so we able
 588          * to retrieve this information if we need it.
 589          */
 590         conn->src_type = own_addr_type;
 591
 592         cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
 593         cp.scan_window = cpu_to_le16(hdev->le_scan_window);
 594         bacpy(&cp.peer_addr, &conn->dst);
 595         cp.peer_addr_type = conn->dst_type;
 596         cp.own_address_type = own_addr_type;
 597         cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 598         cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 599         cp.supervision_timeout = __constant_cpu_to_le16(0x002a);
 600         cp.min_ce_len = __constant_cpu_to_le16(0x0000);
 601         cp.max_ce_len = __constant_cpu_to_le16(0x0000);
 602
 603         hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 604
 605         conn->state = BT_CONNECT;
 606 }
 607
 608 static void stop_scan_complete(struct hci_dev *hdev, u8 status)
 609 {
 610         struct hci_request req;
 611         struct hci_conn *conn;
 612         int err;
 613
 614         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 615         if (!conn)
 616                 return;
 617
 618         if (status) {
 619                 BT_DBG("HCI request failed to stop scanning: status 0x%2.2x",
 620                        status);
 621
 622                 hci_dev_lock(hdev);
 623                 hci_le_conn_failed(conn, status);
 624                 hci_dev_unlock(hdev);
 625                 return;
 626         }
 627
 628         /* Since we may have prematurely stopped discovery procedure, we should
 629          * update discovery state.
 630          */
 631         hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
 632
 633         hci_req_init(&req, hdev);
 634
 635         hci_req_add_le_create_conn(&req, conn);
 636
 637         err = hci_req_run(&req, create_le_conn_complete);
 638         if (err) {
 639                 hci_dev_lock(hdev);
 640                 hci_le_conn_failed(conn, HCI_ERROR_MEMORY_EXCEEDED);
 641                 hci_dev_unlock(hdev);
 642                 return;
 643         }
 644 }
 645
 646 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 647                                 u8 dst_type, u8 sec_level, u8 auth_type)
 648 {
 649         struct hci_conn_params *params;
 650         struct hci_conn *conn;
 651         struct smp_irk *irk;
 652         struct hci_request req;
 653         int err;
 654
 655         if (test_bit(HCI_ADVERTISING, &hdev->flags))
 656                 return ERR_PTR(-ENOTSUPP);
 657
 658         /* Some devices send ATT messages as soon as the physical link is
 659          * established. To be able to handle these ATT messages, the user-
 660          * space first establishes the connection and then starts the pairing
 661          * process.
 662          *
 663          * So if a hci_conn object already exists for the following connection
 664          * attempt, we simply update pending_sec_level and auth_type fields
 665          * and return the object found.
 666          */
 667         conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
 668         if (conn) {
 669                 conn->pending_sec_level = sec_level;
 670                 conn->auth_type = auth_type;
 671                 goto done;
 672         }
 673
 674         /* Since the controller supports only one LE connection attempt at a
 675          * time, we return -EBUSY if there is any connection attempt running.
 676          */
 677         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 678         if (conn)
 679                 return ERR_PTR(-EBUSY);
 680
 681         /* When given an identity address with existing identity
 682          * resolving key, the connection needs to be established
 683          * to a resolvable random address.
 684          *
 685          * This uses the cached random resolvable address from
 686          * a previous scan. When no cached address is available,
 687          * try connecting to the identity address instead.
 688          *
 689          * Storing the resolvable random address is required here
 690          * to handle connection failures. The address will later
 691          * be resolved back into the original identity address
 692          * from the connect request.
 693          */
 694         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
 695         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
 696                 dst = &irk->rpa;
 697                 dst_type = ADDR_LE_DEV_RANDOM;
 698         }
 699
 700         conn = hci_conn_add(hdev, LE_LINK, dst);
 701         if (!conn)
 702                 return ERR_PTR(-ENOMEM);
 703
 704         conn->dst_type = dst_type;
 705
 706         conn->out = true;
 707         conn->link_mode |= HCI_LM_MASTER;
 708         conn->sec_level = BT_SECURITY_LOW;
 709         conn->pending_sec_level = sec_level;
 710         conn->auth_type = auth_type;
 711
 712         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 713         if (params) {
 714                 conn->le_conn_min_interval = params->conn_min_interval;
 715                 conn->le_conn_max_interval = params->conn_max_interval;
 716         } else {
 717                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
 718                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
 719         }
 720
 721         hci_req_init(&req, hdev);
 722
 723         /* If controller is scanning, we stop it since some controllers are
 724          * not able to scan and connect at the same time.
 725          */
 726         if (test_bit(HCI_LE_SCAN, &hdev->dev_flags)) {
 727                 hci_req_add_le_scan_disable(&req);
 728                 err = hci_req_run(&req, stop_scan_complete);
 729         } else {
 730                 hci_req_add_le_create_conn(&req, conn);
 731                 err = hci_req_run(&req, create_le_conn_complete);
 732         }
 733
 734         if (err) {
 735                 hci_conn_del(conn);
 736                 return ERR_PTR(err);
 737         }
 738
 739 done:
 740         hci_conn_hold(conn);
 741         return conn;
 742 }
 743
 744 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
 745                                  u8 sec_level, u8 auth_type)
 746 {
 747         struct hci_conn *acl;
 748
 749         if (!test_bit(HCI_BREDR_ENABLED, &hdev->dev_flags))
 750                 return ERR_PTR(-ENOTSUPP);
 751
 752         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
 753         if (!acl) {
 754                 acl = hci_conn_add(hdev, ACL_LINK, dst);
 755                 if (!acl)
 756                         return ERR_PTR(-ENOMEM);
 757         }
 758
 759         hci_conn_hold(acl);
 760
 761         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
 762                 acl->sec_level = BT_SECURITY_LOW;
 763                 acl->pending_sec_level = sec_level;
 764                 acl->auth_type = auth_type;
 765                 hci_acl_create_connection(acl);
 766         }
 767
 768         return acl;
 769 }
 770
 771 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
 772                                  __u16 setting)
 773 {
 774         struct hci_conn *acl;
 775         struct hci_conn *sco;
 776
 777         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
 778         if (IS_ERR(acl))
 779                 return acl;
 780
 781         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
 782         if (!sco) {
 783                 sco = hci_conn_add(hdev, type, dst);
 784                 if (!sco) {
 785                         hci_conn_drop(acl);
 786                         return ERR_PTR(-ENOMEM);
 787                 }
 788         }
 789
 790         acl->link = sco;
 791         sco->link = acl;
 792
 793         hci_conn_hold(sco);
 794
 795         sco->setting = setting;
 796
 797         if (acl->state == BT_CONNECTED &&
 798             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 799                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
 800                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
 801
 802                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
 803                         /* defer SCO setup until mode change completed */
 804                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
 805                         return sco;
 806                 }
 807
 808                 hci_sco_setup(acl, 0x00);
 809         }
 810
 811         return sco;
 812 }
 813
 814 /* Check link security requirement */
 815 int hci_conn_check_link_mode(struct hci_conn *conn)
 816 {
 817         BT_DBG("hcon %p", conn);
 818
 819         if (hci_conn_ssp_enabled(conn) && !(conn->link_mode & HCI_LM_ENCRYPT))
 820                 return 0;
 821
 822         return 1;
 823 }
 824
 825 /* Authenticate remote device */
 826 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 827 {
 828         BT_DBG("hcon %p", conn);
 829
 830         if (conn->pending_sec_level > sec_level)
 831                 sec_level = conn->pending_sec_level;
 832
 833         if (sec_level > conn->sec_level)
 834                 conn->pending_sec_level = sec_level;
 835         else if (conn->link_mode & HCI_LM_AUTH)
 836                 return 1;
 837
 838         /* Make sure we preserve an existing MITM requirement*/
 839         auth_type |= (conn->auth_type & 0x01);
 840
 841         conn->auth_type = auth_type;
 842
 843         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 844                 struct hci_cp_auth_requested cp;
 845
 846                 /* encrypt must be pending if auth is also pending */
 847                 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
 848
 849                 cp.handle = cpu_to_le16(conn->handle);
 850                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 851                              sizeof(cp), &cp);
 852                 if (conn->key_type != 0xff)
 853                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
 854         }
 855
 856         return 0;
 857 }
 858
 859 /* Encrypt the the link */
 860 static void hci_conn_encrypt(struct hci_conn *conn)
 861 {
 862         BT_DBG("hcon %p", conn);
 863
 864         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
 865                 struct hci_cp_set_conn_encrypt cp;
 866                 cp.handle  = cpu_to_le16(conn->handle);
 867                 cp.encrypt = 0x01;
 868                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
 869                              &cp);
 870         }
 871 }
 872
 873 /* Enable security */
 874 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 875 {
 876         BT_DBG("hcon %p", conn);
 877
 878         if (conn->type == LE_LINK)
 879                 return smp_conn_security(conn, sec_level);
 880
 881         /* For sdp we don't need the link key. */
 882         if (sec_level == BT_SECURITY_SDP)
 883                 return 1;
 884
 885         /* For non 2.1 devices and low security level we don't need the link
 886            key. */
 887         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
 888                 return 1;
 889
 890         /* For other security levels we need the link key. */
 891         if (!(conn->link_mode & HCI_LM_AUTH))
 892                 goto auth;
 893
 894         /* An authenticated FIPS approved combination key has sufficient
 895          * security for security level 4. */
 896         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
 897             sec_level == BT_SECURITY_FIPS)
 898                 goto encrypt;
 899
 900         /* An authenticated combination key has sufficient security for
 901            security level 3. */
 902         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
 903              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
 904             sec_level == BT_SECURITY_HIGH)
 905                 goto encrypt;
 906
 907         /* An unauthenticated combination key has sufficient security for
 908            security level 1 and 2. */
 909         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
 910              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
 911             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
 912                 goto encrypt;
 913
 914         /* A combination key has always sufficient security for the security
 915            levels 1 or 2. High security level requires the combination key
 916            is generated using maximum PIN code length (16).
 917            For pre 2.1 units. */
 918         if (conn->key_type == HCI_LK_COMBINATION &&
 919             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
 920              conn->pin_length == 16))
 921                 goto encrypt;
 922
 923 auth:
 924         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
 925                 return 0;
 926
 927         if (!hci_conn_auth(conn, sec_level, auth_type))
 928                 return 0;
 929
 930 encrypt:
 931         if (conn->link_mode & HCI_LM_ENCRYPT)
 932                 return 1;
 933
 934         hci_conn_encrypt(conn);
 935         return 0;
 936 }
 937 EXPORT_SYMBOL(hci_conn_security);
 938
 939 /* Check secure link requirement */
 940 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
 941 {
 942         BT_DBG("hcon %p", conn);
 943
 944         /* Accept if non-secure or higher security level is required */
 945         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
 946                 return 1;
 947
 948         /* Accept if secure or higher security level is already present */
 949         if (conn->sec_level == BT_SECURITY_HIGH ||
 950             conn->sec_level == BT_SECURITY_FIPS)
 951                 return 1;
 952
 953         /* Reject not secure link */
 954         return 0;
 955 }
 956 EXPORT_SYMBOL(hci_conn_check_secure);
 957
 958 /* Change link key */
 959 int hci_conn_change_link_key(struct hci_conn *conn)
 960 {
 961         BT_DBG("hcon %p", conn);
 962
 963         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 964                 struct hci_cp_change_conn_link_key cp;
 965                 cp.handle = cpu_to_le16(conn->handle);
 966                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 967                              sizeof(cp), &cp);
 968         }
 969
 970         return 0;
 971 }
 972
 973 /* Switch role */
 974 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
 975 {
 976         BT_DBG("hcon %p", conn);
 977
 978         if (!role && conn->link_mode & HCI_LM_MASTER)
 979                 return 1;
 980
 981         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
 982                 struct hci_cp_switch_role cp;
 983                 bacpy(&cp.bdaddr, &conn->dst);
 984                 cp.role = role;
 985                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 986         }
 987
 988         return 0;
 989 }
 990 EXPORT_SYMBOL(hci_conn_switch_role);
 991
 992 /* Enter active mode */
 993 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
 994 {
 995         struct hci_dev *hdev = conn->hdev;
 996
 997         BT_DBG("hcon %p mode %d", conn, conn->mode);
 998
 999         if (test_bit(HCI_RAW, &hdev->flags))
1000                 return;
1001
1002         if (conn->mode != HCI_CM_SNIFF)
1003                 goto timer;
1004
1005         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1006                 goto timer;
1007
1008         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1009                 struct hci_cp_exit_sniff_mode cp;
1010                 cp.handle = cpu_to_le16(conn->handle);
1011                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1012         }
1013
1014 timer:
1015         if (hdev->idle_timeout > 0)
1016                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1017                                    msecs_to_jiffies(hdev->idle_timeout));
1018 }
1019
1020 /* Drop all connection on the device */
1021 void hci_conn_hash_flush(struct hci_dev *hdev)
1022 {
1023         struct hci_conn_hash *h = &hdev->conn_hash;
1024         struct hci_conn *c, *n;
1025
1026         BT_DBG("hdev %s", hdev->name);
1027
1028         list_for_each_entry_safe(c, n, &h->list, list) {
1029                 c->state = BT_CLOSED;
1030
1031                 hci_proto_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1032                 hci_conn_del(c);
1033         }
1034 }
1035
1036 /* Check pending connect attempts */
1037 void hci_conn_check_pending(struct hci_dev *hdev)
1038 {
1039         struct hci_conn *conn;
1040
1041         BT_DBG("hdev %s", hdev->name);
1042
1043         hci_dev_lock(hdev);
1044
1045         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1046         if (conn)
1047                 hci_acl_create_connection(conn);
1048
1049         hci_dev_unlock(hdev);
1050 }
1051
1052 int hci_get_conn_list(void __user *arg)
1053 {
1054         struct hci_conn *c;
1055         struct hci_conn_list_req req, *cl;
1056         struct hci_conn_info *ci;
1057         struct hci_dev *hdev;
1058         int n = 0, size, err;
1059
1060         if (copy_from_user(&req, arg, sizeof(req)))
1061                 return -EFAULT;
1062
1063         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1064                 return -EINVAL;
1065
1066         size = sizeof(req) + req.conn_num * sizeof(*ci);
1067
1068         cl = kmalloc(size, GFP_KERNEL);
1069         if (!cl)
1070                 return -ENOMEM;
1071
1072         hdev = hci_dev_get(req.dev_id);
1073         if (!hdev) {
1074                 kfree(cl);
1075                 return -ENODEV;
1076         }
1077
1078         ci = cl->conn_info;
1079
1080         hci_dev_lock(hdev);
1081         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1082                 bacpy(&(ci + n)->bdaddr, &c->dst);
1083                 (ci + n)->handle = c->handle;
1084                 (ci + n)->type  = c->type;
1085                 (ci + n)->out   = c->out;
1086                 (ci + n)->state = c->state;
1087                 (ci + n)->link_mode = c->link_mode;
1088                 if (++n >= req.conn_num)
1089                         break;
1090         }
1091         hci_dev_unlock(hdev);
1092
1093         cl->dev_id = hdev->id;
1094         cl->conn_num = n;
1095         size = sizeof(req) + n * sizeof(*ci);
1096
1097         hci_dev_put(hdev);
1098
1099         err = copy_to_user(arg, cl, size);
1100         kfree(cl);
1101
1102         return err ? -EFAULT : 0;
1103 }
1104
1105 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1106 {
1107         struct hci_conn_info_req req;
1108         struct hci_conn_info ci;
1109         struct hci_conn *conn;
1110         char __user *ptr = arg + sizeof(req);
1111
1112         if (copy_from_user(&req, arg, sizeof(req)))
1113                 return -EFAULT;
1114
1115         hci_dev_lock(hdev);
1116         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1117         if (conn) {
1118                 bacpy(&ci.bdaddr, &conn->dst);
1119                 ci.handle = conn->handle;
1120                 ci.type  = conn->type;
1121                 ci.out   = conn->out;
1122                 ci.state = conn->state;
1123                 ci.link_mode = conn->link_mode;
1124         }
1125         hci_dev_unlock(hdev);
1126
1127         if (!conn)
1128                 return -ENOENT;
1129
1130         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1131 }
1132
1133 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1134 {
1135         struct hci_auth_info_req req;
1136         struct hci_conn *conn;
1137
1138         if (copy_from_user(&req, arg, sizeof(req)))
1139                 return -EFAULT;
1140
1141         hci_dev_lock(hdev);
1142         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1143         if (conn)
1144                 req.type = conn->auth_type;
1145         hci_dev_unlock(hdev);
1146
1147         if (!conn)
1148                 return -ENOENT;
1149
1150         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1151 }
1152
1153 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1154 {
1155         struct hci_dev *hdev = conn->hdev;
1156         struct hci_chan *chan;
1157
1158         BT_DBG("%s hcon %p", hdev->name, conn);
1159
1160         chan = kzalloc(sizeof(struct hci_chan), GFP_KERNEL);
1161         if (!chan)
1162                 return NULL;
1163
1164         chan->conn = conn;
1165         skb_queue_head_init(&chan->data_q);
1166         chan->state = BT_CONNECTED;
1167
1168         list_add_rcu(&chan->list, &conn->chan_list);
1169
1170         return chan;
1171 }
1172
1173 void hci_chan_del(struct hci_chan *chan)
1174 {
1175         struct hci_conn *conn = chan->conn;
1176         struct hci_dev *hdev = conn->hdev;
1177
1178         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1179
1180         list_del_rcu(&chan->list);
1181
1182         synchronize_rcu();
1183
1184         hci_conn_drop(conn);
1185
1186         skb_queue_purge(&chan->data_q);
1187         kfree(chan);
1188 }
1189
1190 void hci_chan_list_flush(struct hci_conn *conn)
1191 {
1192         struct hci_chan *chan, *n;
1193
1194         BT_DBG("hcon %p", conn);
1195
1196         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1197                 hci_chan_del(chan);
1198 }
1199
1200 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1201                                                  __u16 handle)
1202 {
1203         struct hci_chan *hchan;
1204
1205         list_for_each_entry(hchan, &hcon->chan_list, list) {
1206                 if (hchan->handle == handle)
1207                         return hchan;
1208         }
1209
1210         return NULL;
1211 }
1212
1213 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1214 {
1215         struct hci_conn_hash *h = &hdev->conn_hash;
1216         struct hci_conn *hcon;
1217         struct hci_chan *hchan = NULL;
1218
1219         rcu_read_lock();
1220
1221         list_for_each_entry_rcu(hcon, &h->list, list) {
1222                 hchan = __hci_chan_lookup_handle(hcon, handle);
1223                 if (hchan)
1224                         break;
1225         }
1226
1227         rcu_read_unlock();
1228
1229         return hchan;
1230 }