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                 cp.handle = cpu_to_le16(conn->handle);
 823                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 824                              sizeof(cp), &cp);
 825
 826                 /* If we're already encrypted set the REAUTH_PEND flag,
 827                  * otherwise set the ENCRYPT_PEND.
 828                  */
 829                 if (conn->key_type != 0xff)
 830                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
 831                 else
 832                         set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
 833         }
 834
 835         return 0;
 836 }
 837
 838 /* Encrypt the the link */
 839 static void hci_conn_encrypt(struct hci_conn *conn)
 840 {
 841         BT_DBG("hcon %p", conn);
 842
 843         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
 844                 struct hci_cp_set_conn_encrypt cp;
 845                 cp.handle  = cpu_to_le16(conn->handle);
 846                 cp.encrypt = 0x01;
 847                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
 848                              &cp);
 849         }
 850 }
 851
 852 /* Enable security */
 853 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 854 {
 855         BT_DBG("hcon %p", conn);
 856
 857         if (conn->type == LE_LINK)
 858                 return smp_conn_security(conn, sec_level);
 859
 860         /* For sdp we don't need the link key. */
 861         if (sec_level == BT_SECURITY_SDP)
 862                 return 1;
 863
 864         /* For non 2.1 devices and low security level we don't need the link
 865            key. */
 866         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
 867                 return 1;
 868
 869         /* For other security levels we need the link key. */
 870         if (!(conn->link_mode & HCI_LM_AUTH))
 871                 goto auth;
 872
 873         /* An authenticated FIPS approved combination key has sufficient
 874          * security for security level 4. */
 875         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
 876             sec_level == BT_SECURITY_FIPS)
 877                 goto encrypt;
 878
 879         /* An authenticated combination key has sufficient security for
 880            security level 3. */
 881         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
 882              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
 883             sec_level == BT_SECURITY_HIGH)
 884                 goto encrypt;
 885
 886         /* An unauthenticated combination key has sufficient security for
 887            security level 1 and 2. */
 888         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
 889              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
 890             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
 891                 goto encrypt;
 892
 893         /* A combination key has always sufficient security for the security
 894            levels 1 or 2. High security level requires the combination key
 895            is generated using maximum PIN code length (16).
 896            For pre 2.1 units. */
 897         if (conn->key_type == HCI_LK_COMBINATION &&
 898             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
 899              conn->pin_length == 16))
 900                 goto encrypt;
 901
 902 auth:
 903         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
 904                 return 0;
 905
 906         if (!hci_conn_auth(conn, sec_level, auth_type))
 907                 return 0;
 908
 909 encrypt:
 910         if (conn->link_mode & HCI_LM_ENCRYPT)
 911                 return 1;
 912
 913         hci_conn_encrypt(conn);
 914         return 0;
 915 }
 916 EXPORT_SYMBOL(hci_conn_security);
 917
 918 /* Check secure link requirement */
 919 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
 920 {
 921         BT_DBG("hcon %p", conn);
 922
 923         /* Accept if non-secure or higher security level is required */
 924         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
 925                 return 1;
 926
 927         /* Accept if secure or higher security level is already present */
 928         if (conn->sec_level == BT_SECURITY_HIGH ||
 929             conn->sec_level == BT_SECURITY_FIPS)
 930                 return 1;
 931
 932         /* Reject not secure link */
 933         return 0;
 934 }
 935 EXPORT_SYMBOL(hci_conn_check_secure);
 936
 937 /* Change link key */
 938 int hci_conn_change_link_key(struct hci_conn *conn)
 939 {
 940         BT_DBG("hcon %p", conn);
 941
 942         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 943                 struct hci_cp_change_conn_link_key cp;
 944                 cp.handle = cpu_to_le16(conn->handle);
 945                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 946                              sizeof(cp), &cp);
 947         }
 948
 949         return 0;
 950 }
 951
 952 /* Switch role */
 953 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
 954 {
 955         BT_DBG("hcon %p", conn);
 956
 957         if (!role && conn->link_mode & HCI_LM_MASTER)
 958                 return 1;
 959
 960         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
 961                 struct hci_cp_switch_role cp;
 962                 bacpy(&cp.bdaddr, &conn->dst);
 963                 cp.role = role;
 964                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 965         }
 966
 967         return 0;
 968 }
 969 EXPORT_SYMBOL(hci_conn_switch_role);
 970
 971 /* Enter active mode */
 972 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
 973 {
 974         struct hci_dev *hdev = conn->hdev;
 975
 976         BT_DBG("hcon %p mode %d", conn, conn->mode);
 977
 978         if (test_bit(HCI_RAW, &hdev->flags))
 979                 return;
 980
 981         if (conn->mode != HCI_CM_SNIFF)
 982                 goto timer;
 983
 984         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
 985                 goto timer;
 986
 987         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 988                 struct hci_cp_exit_sniff_mode cp;
 989                 cp.handle = cpu_to_le16(conn->handle);
 990                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 991         }
 992
 993 timer:
 994         if (hdev->idle_timeout > 0)
 995                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
 996                                    msecs_to_jiffies(hdev->idle_timeout));
 997 }
 998
 999 /* Drop all connection on the device */
1000 void hci_conn_hash_flush(struct hci_dev *hdev)
1001 {
1002         struct hci_conn_hash *h = &hdev->conn_hash;
1003         struct hci_conn *c, *n;
1004
1005         BT_DBG("hdev %s", hdev->name);
1006
1007         list_for_each_entry_safe(c, n, &h->list, list) {
1008                 c->state = BT_CLOSED;
1009
1010                 hci_proto_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1011                 hci_conn_del(c);
1012         }
1013 }
1014
1015 /* Check pending connect attempts */
1016 void hci_conn_check_pending(struct hci_dev *hdev)
1017 {
1018         struct hci_conn *conn;
1019
1020         BT_DBG("hdev %s", hdev->name);
1021
1022         hci_dev_lock(hdev);
1023
1024         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1025         if (conn)
1026                 hci_acl_create_connection(conn);
1027
1028         hci_dev_unlock(hdev);
1029 }
1030
1031 int hci_get_conn_list(void __user *arg)
1032 {
1033         struct hci_conn *c;
1034         struct hci_conn_list_req req, *cl;
1035         struct hci_conn_info *ci;
1036         struct hci_dev *hdev;
1037         int n = 0, size, err;
1038
1039         if (copy_from_user(&req, arg, sizeof(req)))
1040                 return -EFAULT;
1041
1042         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1043                 return -EINVAL;
1044
1045         size = sizeof(req) + req.conn_num * sizeof(*ci);
1046
1047         cl = kmalloc(size, GFP_KERNEL);
1048         if (!cl)
1049                 return -ENOMEM;
1050
1051         hdev = hci_dev_get(req.dev_id);
1052         if (!hdev) {
1053                 kfree(cl);
1054                 return -ENODEV;
1055         }
1056
1057         ci = cl->conn_info;
1058
1059         hci_dev_lock(hdev);
1060         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1061                 bacpy(&(ci + n)->bdaddr, &c->dst);
1062                 (ci + n)->handle = c->handle;
1063                 (ci + n)->type  = c->type;
1064                 (ci + n)->out   = c->out;
1065                 (ci + n)->state = c->state;
1066                 (ci + n)->link_mode = c->link_mode;
1067                 if (++n >= req.conn_num)
1068                         break;
1069         }
1070         hci_dev_unlock(hdev);
1071
1072         cl->dev_id = hdev->id;
1073         cl->conn_num = n;
1074         size = sizeof(req) + n * sizeof(*ci);
1075
1076         hci_dev_put(hdev);
1077
1078         err = copy_to_user(arg, cl, size);
1079         kfree(cl);
1080
1081         return err ? -EFAULT : 0;
1082 }
1083
1084 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1085 {
1086         struct hci_conn_info_req req;
1087         struct hci_conn_info ci;
1088         struct hci_conn *conn;
1089         char __user *ptr = arg + sizeof(req);
1090
1091         if (copy_from_user(&req, arg, sizeof(req)))
1092                 return -EFAULT;
1093
1094         hci_dev_lock(hdev);
1095         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1096         if (conn) {
1097                 bacpy(&ci.bdaddr, &conn->dst);
1098                 ci.handle = conn->handle;
1099                 ci.type  = conn->type;
1100                 ci.out   = conn->out;
1101                 ci.state = conn->state;
1102                 ci.link_mode = conn->link_mode;
1103         }
1104         hci_dev_unlock(hdev);
1105
1106         if (!conn)
1107                 return -ENOENT;
1108
1109         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1110 }
1111
1112 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1113 {
1114         struct hci_auth_info_req req;
1115         struct hci_conn *conn;
1116
1117         if (copy_from_user(&req, arg, sizeof(req)))
1118                 return -EFAULT;
1119
1120         hci_dev_lock(hdev);
1121         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1122         if (conn)
1123                 req.type = conn->auth_type;
1124         hci_dev_unlock(hdev);
1125
1126         if (!conn)
1127                 return -ENOENT;
1128
1129         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1130 }
1131
1132 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1133 {
1134         struct hci_dev *hdev = conn->hdev;
1135         struct hci_chan *chan;
1136
1137         BT_DBG("%s hcon %p", hdev->name, conn);
1138
1139         chan = kzalloc(sizeof(struct hci_chan), GFP_KERNEL);
1140         if (!chan)
1141                 return NULL;
1142
1143         chan->conn = conn;
1144         skb_queue_head_init(&chan->data_q);
1145         chan->state = BT_CONNECTED;
1146
1147         list_add_rcu(&chan->list, &conn->chan_list);
1148
1149         return chan;
1150 }
1151
1152 void hci_chan_del(struct hci_chan *chan)
1153 {
1154         struct hci_conn *conn = chan->conn;
1155         struct hci_dev *hdev = conn->hdev;
1156
1157         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1158
1159         list_del_rcu(&chan->list);
1160
1161         synchronize_rcu();
1162
1163         hci_conn_drop(conn);
1164
1165         skb_queue_purge(&chan->data_q);
1166         kfree(chan);
1167 }
1168
1169 void hci_chan_list_flush(struct hci_conn *conn)
1170 {
1171         struct hci_chan *chan, *n;
1172
1173         BT_DBG("hcon %p", conn);
1174
1175         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1176                 hci_chan_del(chan);
1177 }
1178
1179 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1180                                                  __u16 handle)
1181 {
1182         struct hci_chan *hchan;
1183
1184         list_for_each_entry(hchan, &hcon->chan_list, list) {
1185                 if (hchan->handle == handle)
1186                         return hchan;
1187         }
1188
1189         return NULL;
1190 }
1191
1192 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1193 {
1194         struct hci_conn_hash *h = &hdev->conn_hash;
1195         struct hci_conn *hcon;
1196         struct hci_chan *hchan = NULL;
1197
1198         rcu_read_lock();
1199
1200         list_for_each_entry_rcu(hcon, &h->list, list) {
1201                 hchan = __hci_chan_lookup_handle(hcon, handle);
1202                 if (hchan)
1203                         break;
1204         }
1205
1206         rcu_read_unlock();
1207
1208         return hchan;
1209 }