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                                             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   = cpu_to_le32(0x00001f40);
 186         cp.rx_bandwidth   = 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           = cpu_to_le16(0x0000);
 229         cp.max_ce_len           = 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        = cpu_to_le16(0);
 341                 cp.min_remote_timeout = cpu_to_le16(0);
 342                 cp.min_local_timeout  = 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      = cpu_to_le16(4);
 352                 cp.timeout      = 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 = cpu_to_le16(0x002a);
 600         cp.min_ce_len = cpu_to_le16(0x0000);
 601         cp.max_ce_len = 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 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 609                                 u8 dst_type, u8 sec_level, u8 auth_type)
 610 {
 611         struct hci_conn_params *params;
 612         struct hci_conn *conn;
 613         struct smp_irk *irk;
 614         struct hci_request req;
 615         int err;
 616
 617         if (test_bit(HCI_ADVERTISING, &hdev->flags))
 618                 return ERR_PTR(-ENOTSUPP);
 619
 620         /* Some devices send ATT messages as soon as the physical link is
 621          * established. To be able to handle these ATT messages, the user-
 622          * space first establishes the connection and then starts the pairing
 623          * process.
 624          *
 625          * So if a hci_conn object already exists for the following connection
 626          * attempt, we simply update pending_sec_level and auth_type fields
 627          * and return the object found.
 628          */
 629         conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
 630         if (conn) {
 631                 conn->pending_sec_level = sec_level;
 632                 conn->auth_type = auth_type;
 633                 goto done;
 634         }
 635
 636         /* Since the controller supports only one LE connection attempt at a
 637          * time, we return -EBUSY if there is any connection attempt running.
 638          */
 639         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 640         if (conn)
 641                 return ERR_PTR(-EBUSY);
 642
 643         /* When given an identity address with existing identity
 644          * resolving key, the connection needs to be established
 645          * to a resolvable random address.
 646          *
 647          * This uses the cached random resolvable address from
 648          * a previous scan. When no cached address is available,
 649          * try connecting to the identity address instead.
 650          *
 651          * Storing the resolvable random address is required here
 652          * to handle connection failures. The address will later
 653          * be resolved back into the original identity address
 654          * from the connect request.
 655          */
 656         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
 657         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
 658                 dst = &irk->rpa;
 659                 dst_type = ADDR_LE_DEV_RANDOM;
 660         }
 661
 662         conn = hci_conn_add(hdev, LE_LINK, dst);
 663         if (!conn)
 664                 return ERR_PTR(-ENOMEM);
 665
 666         conn->dst_type = dst_type;
 667
 668         conn->out = true;
 669         conn->link_mode |= HCI_LM_MASTER;
 670         conn->sec_level = BT_SECURITY_LOW;
 671         conn->pending_sec_level = sec_level;
 672         conn->auth_type = auth_type;
 673
 674         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 675         if (params) {
 676                 conn->le_conn_min_interval = params->conn_min_interval;
 677                 conn->le_conn_max_interval = params->conn_max_interval;
 678         } else {
 679                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
 680                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
 681         }
 682
 683         hci_req_init(&req, hdev);
 684
 685         /* If controller is scanning, we stop it since some controllers are
 686          * not able to scan and connect at the same time. Also set the
 687          * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
 688          * handler for scan disabling knows to set the correct discovery
 689          * state.
 690          */
 691         if (test_bit(HCI_LE_SCAN, &hdev->dev_flags)) {
 692                 hci_req_add_le_scan_disable(&req);
 693                 set_bit(HCI_LE_SCAN_INTERRUPTED, &hdev->dev_flags);
 694         }
 695
 696         hci_req_add_le_create_conn(&req, conn);
 697
 698         err = hci_req_run(&req, create_le_conn_complete);
 699         if (err) {
 700                 hci_conn_del(conn);
 701                 return ERR_PTR(err);
 702         }
 703
 704 done:
 705         hci_conn_hold(conn);
 706         return conn;
 707 }
 708
 709 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
 710                                  u8 sec_level, u8 auth_type)
 711 {
 712         struct hci_conn *acl;
 713
 714         if (!test_bit(HCI_BREDR_ENABLED, &hdev->dev_flags))
 715                 return ERR_PTR(-ENOTSUPP);
 716
 717         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
 718         if (!acl) {
 719                 acl = hci_conn_add(hdev, ACL_LINK, dst);
 720                 if (!acl)
 721                         return ERR_PTR(-ENOMEM);
 722         }
 723
 724         hci_conn_hold(acl);
 725
 726         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
 727                 acl->sec_level = BT_SECURITY_LOW;
 728                 acl->pending_sec_level = sec_level;
 729                 acl->auth_type = auth_type;
 730                 hci_acl_create_connection(acl);
 731         }
 732
 733         return acl;
 734 }
 735
 736 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
 737                                  __u16 setting)
 738 {
 739         struct hci_conn *acl;
 740         struct hci_conn *sco;
 741
 742         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
 743         if (IS_ERR(acl))
 744                 return acl;
 745
 746         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
 747         if (!sco) {
 748                 sco = hci_conn_add(hdev, type, dst);
 749                 if (!sco) {
 750                         hci_conn_drop(acl);
 751                         return ERR_PTR(-ENOMEM);
 752                 }
 753         }
 754
 755         acl->link = sco;
 756         sco->link = acl;
 757
 758         hci_conn_hold(sco);
 759
 760         sco->setting = setting;
 761
 762         if (acl->state == BT_CONNECTED &&
 763             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 764                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
 765                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
 766
 767                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
 768                         /* defer SCO setup until mode change completed */
 769                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
 770                         return sco;
 771                 }
 772
 773                 hci_sco_setup(acl, 0x00);
 774         }
 775
 776         return sco;
 777 }
 778
 779 /* Check link security requirement */
 780 int hci_conn_check_link_mode(struct hci_conn *conn)
 781 {
 782         BT_DBG("hcon %p", conn);
 783
 784         /* In Secure Connections Only mode, it is required that Secure
 785          * Connections is used and the link is encrypted with AES-CCM
 786          * using a P-256 authenticated combination key.
 787          */
 788         if (test_bit(HCI_SC_ONLY, &conn->hdev->flags)) {
 789                 if (!hci_conn_sc_enabled(conn) ||
 790                     !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
 791                     conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
 792                         return 0;
 793         }
 794
 795         if (hci_conn_ssp_enabled(conn) && !(conn->link_mode & HCI_LM_ENCRYPT))
 796                 return 0;
 797
 798         return 1;
 799 }
 800
 801 /* Authenticate remote device */
 802 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 803 {
 804         BT_DBG("hcon %p", conn);
 805
 806         if (conn->pending_sec_level > sec_level)
 807                 sec_level = conn->pending_sec_level;
 808
 809         if (sec_level > conn->sec_level)
 810                 conn->pending_sec_level = sec_level;
 811         else if (conn->link_mode & HCI_LM_AUTH)
 812                 return 1;
 813
 814         /* Make sure we preserve an existing MITM requirement*/
 815         auth_type |= (conn->auth_type & 0x01);
 816
 817         conn->auth_type = auth_type;
 818
 819         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 820                 struct hci_cp_auth_requested cp;
 821
 822                 /* encrypt must be pending if auth is also pending */
 823                 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
 824
 825                 cp.handle = cpu_to_le16(conn->handle);
 826                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 827                              sizeof(cp), &cp);
 828                 if (conn->key_type != 0xff)
 829                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
 830         }
 831
 832         return 0;
 833 }
 834
 835 /* Encrypt the the link */
 836 static void hci_conn_encrypt(struct hci_conn *conn)
 837 {
 838         BT_DBG("hcon %p", conn);
 839
 840         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
 841                 struct hci_cp_set_conn_encrypt cp;
 842                 cp.handle  = cpu_to_le16(conn->handle);
 843                 cp.encrypt = 0x01;
 844                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
 845                              &cp);
 846         }
 847 }
 848
 849 /* Enable security */
 850 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 851 {
 852         BT_DBG("hcon %p", conn);
 853
 854         if (conn->type == LE_LINK)
 855                 return smp_conn_security(conn, sec_level);
 856
 857         /* For sdp we don't need the link key. */
 858         if (sec_level == BT_SECURITY_SDP)
 859                 return 1;
 860
 861         /* For non 2.1 devices and low security level we don't need the link
 862            key. */
 863         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
 864                 return 1;
 865
 866         /* For other security levels we need the link key. */
 867         if (!(conn->link_mode & HCI_LM_AUTH))
 868                 goto auth;
 869
 870         /* An authenticated FIPS approved combination key has sufficient
 871          * security for security level 4. */
 872         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
 873             sec_level == BT_SECURITY_FIPS)
 874                 goto encrypt;
 875
 876         /* An authenticated combination key has sufficient security for
 877            security level 3. */
 878         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
 879              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
 880             sec_level == BT_SECURITY_HIGH)
 881                 goto encrypt;
 882
 883         /* An unauthenticated combination key has sufficient security for
 884            security level 1 and 2. */
 885         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
 886              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
 887             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
 888                 goto encrypt;
 889
 890         /* A combination key has always sufficient security for the security
 891            levels 1 or 2. High security level requires the combination key
 892            is generated using maximum PIN code length (16).
 893            For pre 2.1 units. */
 894         if (conn->key_type == HCI_LK_COMBINATION &&
 895             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
 896              conn->pin_length == 16))
 897                 goto encrypt;
 898
 899 auth:
 900         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
 901                 return 0;
 902
 903         if (!hci_conn_auth(conn, sec_level, auth_type))
 904                 return 0;
 905
 906 encrypt:
 907         if (conn->link_mode & HCI_LM_ENCRYPT)
 908                 return 1;
 909
 910         hci_conn_encrypt(conn);
 911         return 0;
 912 }
 913 EXPORT_SYMBOL(hci_conn_security);
 914
 915 /* Check secure link requirement */
 916 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
 917 {
 918         BT_DBG("hcon %p", conn);
 919
 920         /* Accept if non-secure or higher security level is required */
 921         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
 922                 return 1;
 923
 924         /* Accept if secure or higher security level is already present */
 925         if (conn->sec_level == BT_SECURITY_HIGH ||
 926             conn->sec_level == BT_SECURITY_FIPS)
 927                 return 1;
 928
 929         /* Reject not secure link */
 930         return 0;
 931 }
 932 EXPORT_SYMBOL(hci_conn_check_secure);
 933
 934 /* Change link key */
 935 int hci_conn_change_link_key(struct hci_conn *conn)
 936 {
 937         BT_DBG("hcon %p", conn);
 938
 939         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 940                 struct hci_cp_change_conn_link_key cp;
 941                 cp.handle = cpu_to_le16(conn->handle);
 942                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 943                              sizeof(cp), &cp);
 944         }
 945
 946         return 0;
 947 }
 948
 949 /* Switch role */
 950 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
 951 {
 952         BT_DBG("hcon %p", conn);
 953
 954         if (!role && conn->link_mode & HCI_LM_MASTER)
 955                 return 1;
 956
 957         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
 958                 struct hci_cp_switch_role cp;
 959                 bacpy(&cp.bdaddr, &conn->dst);
 960                 cp.role = role;
 961                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 962         }
 963
 964         return 0;
 965 }
 966 EXPORT_SYMBOL(hci_conn_switch_role);
 967
 968 /* Enter active mode */
 969 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
 970 {
 971         struct hci_dev *hdev = conn->hdev;
 972
 973         BT_DBG("hcon %p mode %d", conn, conn->mode);
 974
 975         if (test_bit(HCI_RAW, &hdev->flags))
 976                 return;
 977
 978         if (conn->mode != HCI_CM_SNIFF)
 979                 goto timer;
 980
 981         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
 982                 goto timer;
 983
 984         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 985                 struct hci_cp_exit_sniff_mode cp;
 986                 cp.handle = cpu_to_le16(conn->handle);
 987                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 988         }
 989
 990 timer:
 991         if (hdev->idle_timeout > 0)
 992                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
 993                                    msecs_to_jiffies(hdev->idle_timeout));
 994 }
 995
 996 /* Drop all connection on the device */
 997 void hci_conn_hash_flush(struct hci_dev *hdev)
 998 {
 999         struct hci_conn_hash *h = &hdev->conn_hash;
1000         struct hci_conn *c, *n;
1001
1002         BT_DBG("hdev %s", hdev->name);
1003
1004         list_for_each_entry_safe(c, n, &h->list, list) {
1005                 c->state = BT_CLOSED;
1006
1007                 hci_proto_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1008                 hci_conn_del(c);
1009         }
1010 }
1011
1012 /* Check pending connect attempts */
1013 void hci_conn_check_pending(struct hci_dev *hdev)
1014 {
1015         struct hci_conn *conn;
1016
1017         BT_DBG("hdev %s", hdev->name);
1018
1019         hci_dev_lock(hdev);
1020
1021         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1022         if (conn)
1023                 hci_acl_create_connection(conn);
1024
1025         hci_dev_unlock(hdev);
1026 }
1027
1028 int hci_get_conn_list(void __user *arg)
1029 {
1030         struct hci_conn *c;
1031         struct hci_conn_list_req req, *cl;
1032         struct hci_conn_info *ci;
1033         struct hci_dev *hdev;
1034         int n = 0, size, err;
1035
1036         if (copy_from_user(&req, arg, sizeof(req)))
1037                 return -EFAULT;
1038
1039         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1040                 return -EINVAL;
1041
1042         size = sizeof(req) + req.conn_num * sizeof(*ci);
1043
1044         cl = kmalloc(size, GFP_KERNEL);
1045         if (!cl)
1046                 return -ENOMEM;
1047
1048         hdev = hci_dev_get(req.dev_id);
1049         if (!hdev) {
1050                 kfree(cl);
1051                 return -ENODEV;
1052         }
1053
1054         ci = cl->conn_info;
1055
1056         hci_dev_lock(hdev);
1057         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1058                 bacpy(&(ci + n)->bdaddr, &c->dst);
1059                 (ci + n)->handle = c->handle;
1060                 (ci + n)->type  = c->type;
1061                 (ci + n)->out   = c->out;
1062                 (ci + n)->state = c->state;
1063                 (ci + n)->link_mode = c->link_mode;
1064                 if (++n >= req.conn_num)
1065                         break;
1066         }
1067         hci_dev_unlock(hdev);
1068
1069         cl->dev_id = hdev->id;
1070         cl->conn_num = n;
1071         size = sizeof(req) + n * sizeof(*ci);
1072
1073         hci_dev_put(hdev);
1074
1075         err = copy_to_user(arg, cl, size);
1076         kfree(cl);
1077
1078         return err ? -EFAULT : 0;
1079 }
1080
1081 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1082 {
1083         struct hci_conn_info_req req;
1084         struct hci_conn_info ci;
1085         struct hci_conn *conn;
1086         char __user *ptr = arg + sizeof(req);
1087
1088         if (copy_from_user(&req, arg, sizeof(req)))
1089                 return -EFAULT;
1090
1091         hci_dev_lock(hdev);
1092         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1093         if (conn) {
1094                 bacpy(&ci.bdaddr, &conn->dst);
1095                 ci.handle = conn->handle;
1096                 ci.type  = conn->type;
1097                 ci.out   = conn->out;
1098                 ci.state = conn->state;
1099                 ci.link_mode = conn->link_mode;
1100         }
1101         hci_dev_unlock(hdev);
1102
1103         if (!conn)
1104                 return -ENOENT;
1105
1106         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1107 }
1108
1109 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1110 {
1111         struct hci_auth_info_req req;
1112         struct hci_conn *conn;
1113
1114         if (copy_from_user(&req, arg, sizeof(req)))
1115                 return -EFAULT;
1116
1117         hci_dev_lock(hdev);
1118         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1119         if (conn)
1120                 req.type = conn->auth_type;
1121         hci_dev_unlock(hdev);
1122
1123         if (!conn)
1124                 return -ENOENT;
1125
1126         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1127 }
1128
1129 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1130 {
1131         struct hci_dev *hdev = conn->hdev;
1132         struct hci_chan *chan;
1133
1134         BT_DBG("%s hcon %p", hdev->name, conn);
1135
1136         chan = kzalloc(sizeof(struct hci_chan), GFP_KERNEL);
1137         if (!chan)
1138                 return NULL;
1139
1140         chan->conn = conn;
1141         skb_queue_head_init(&chan->data_q);
1142         chan->state = BT_CONNECTED;
1143
1144         list_add_rcu(&chan->list, &conn->chan_list);
1145
1146         return chan;
1147 }
1148
1149 void hci_chan_del(struct hci_chan *chan)
1150 {
1151         struct hci_conn *conn = chan->conn;
1152         struct hci_dev *hdev = conn->hdev;
1153
1154         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1155
1156         list_del_rcu(&chan->list);
1157
1158         synchronize_rcu();
1159
1160         hci_conn_drop(conn);
1161
1162         skb_queue_purge(&chan->data_q);
1163         kfree(chan);
1164 }
1165
1166 void hci_chan_list_flush(struct hci_conn *conn)
1167 {
1168         struct hci_chan *chan, *n;
1169
1170         BT_DBG("hcon %p", conn);
1171
1172         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1173                 hci_chan_del(chan);
1174 }
1175
1176 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1177                                                  __u16 handle)
1178 {
1179         struct hci_chan *hchan;
1180
1181         list_for_each_entry(hchan, &hcon->chan_list, list) {
1182                 if (hchan->handle == handle)
1183                         return hchan;
1184         }
1185
1186         return NULL;
1187 }
1188
1189 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1190 {
1191         struct hci_conn_hash *h = &hdev->conn_hash;
1192         struct hci_conn *hcon;
1193         struct hci_chan *hchan = NULL;
1194
1195         rcu_read_lock();
1196
1197         list_for_each_entry_rcu(hcon, &h->list, list) {
1198                 hchan = __hci_chan_lookup_handle(hcon, handle);
1199                 if (hchan)
1200                         break;
1201         }
1202
1203         rcu_read_unlock();
1204
1205         return hchan;
1206 }