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, __u8 rand[8],
 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         memcpy(cp.ltk, ltk, sizeof(cp.ltk));
 246         cp.ediv = ediv;
 247         memcpy(cp.rand, rand, sizeof(cp.rand));
 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 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
 367 {
 368         struct hci_conn *conn;
 369
 370         BT_DBG("%s dst %pMR", hdev->name, dst);
 371
 372         conn = kzalloc(sizeof(struct hci_conn), GFP_KERNEL);
 373         if (!conn)
 374                 return NULL;
 375
 376         bacpy(&conn->dst, dst);
 377         bacpy(&conn->src, &hdev->bdaddr);
 378         conn->hdev  = hdev;
 379         conn->type  = type;
 380         conn->mode  = HCI_CM_ACTIVE;
 381         conn->state = BT_OPEN;
 382         conn->auth_type = HCI_AT_GENERAL_BONDING;
 383         conn->io_capability = hdev->io_capability;
 384         conn->remote_auth = 0xff;
 385         conn->key_type = 0xff;
 386
 387         set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
 388         conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 389
 390         switch (type) {
 391         case ACL_LINK:
 392                 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 393                 break;
 394         case SCO_LINK:
 395                 if (lmp_esco_capable(hdev))
 396                         conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 397                                         (hdev->esco_type & EDR_ESCO_MASK);
 398                 else
 399                         conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 400                 break;
 401         case ESCO_LINK:
 402                 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 403                 break;
 404         }
 405
 406         skb_queue_head_init(&conn->data_q);
 407
 408         INIT_LIST_HEAD(&conn->chan_list);
 409
 410         INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
 411         INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
 412         INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
 413
 414         atomic_set(&conn->refcnt, 0);
 415
 416         hci_dev_hold(hdev);
 417
 418         hci_conn_hash_add(hdev, conn);
 419         if (hdev->notify)
 420                 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 421
 422         hci_conn_init_sysfs(conn);
 423
 424         return conn;
 425 }
 426
 427 int hci_conn_del(struct hci_conn *conn)
 428 {
 429         struct hci_dev *hdev = conn->hdev;
 430
 431         BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
 432
 433         cancel_delayed_work_sync(&conn->disc_work);
 434         cancel_delayed_work_sync(&conn->auto_accept_work);
 435         cancel_delayed_work_sync(&conn->idle_work);
 436
 437         if (conn->type == ACL_LINK) {
 438                 struct hci_conn *sco = conn->link;
 439                 if (sco)
 440                         sco->link = NULL;
 441
 442                 /* Unacked frames */
 443                 hdev->acl_cnt += conn->sent;
 444         } else if (conn->type == LE_LINK) {
 445                 if (hdev->le_pkts)
 446                         hdev->le_cnt += conn->sent;
 447                 else
 448                         hdev->acl_cnt += conn->sent;
 449         } else {
 450                 struct hci_conn *acl = conn->link;
 451                 if (acl) {
 452                         acl->link = NULL;
 453                         hci_conn_drop(acl);
 454                 }
 455         }
 456
 457         hci_chan_list_flush(conn);
 458
 459         if (conn->amp_mgr)
 460                 amp_mgr_put(conn->amp_mgr);
 461
 462         hci_conn_hash_del(hdev, conn);
 463         if (hdev->notify)
 464                 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 465
 466         skb_queue_purge(&conn->data_q);
 467
 468         hci_conn_del_sysfs(conn);
 469
 470         hci_dev_put(hdev);
 471
 472         hci_conn_put(conn);
 473
 474         return 0;
 475 }
 476
 477 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
 478 {
 479         int use_src = bacmp(src, BDADDR_ANY);
 480         struct hci_dev *hdev = NULL, *d;
 481
 482         BT_DBG("%pMR -> %pMR", src, dst);
 483
 484         read_lock(&hci_dev_list_lock);
 485
 486         list_for_each_entry(d, &hci_dev_list, list) {
 487                 if (!test_bit(HCI_UP, &d->flags) ||
 488                     test_bit(HCI_RAW, &d->flags) ||
 489                     test_bit(HCI_USER_CHANNEL, &d->dev_flags) ||
 490                     d->dev_type != HCI_BREDR)
 491                         continue;
 492
 493                 /* Simple routing:
 494                  *   No source address - find interface with bdaddr != dst
 495                  *   Source address    - find interface with bdaddr == src
 496                  */
 497
 498                 if (use_src) {
 499                         if (!bacmp(&d->bdaddr, src)) {
 500                                 hdev = d; break;
 501                         }
 502                 } else {
 503                         if (bacmp(&d->bdaddr, dst)) {
 504                                 hdev = d; break;
 505                         }
 506                 }
 507         }
 508
 509         if (hdev)
 510                 hdev = hci_dev_hold(hdev);
 511
 512         read_unlock(&hci_dev_list_lock);
 513         return hdev;
 514 }
 515 EXPORT_SYMBOL(hci_get_route);
 516
 517 /* This function requires the caller holds hdev->lock */
 518 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 519 {
 520         struct hci_dev *hdev = conn->hdev;
 521
 522         conn->state = BT_CLOSED;
 523
 524         mgmt_connect_failed(hdev, &conn->dst, conn->type, conn->dst_type,
 525                             status);
 526
 527         hci_proto_connect_cfm(conn, status);
 528
 529         hci_conn_del(conn);
 530 }
 531
 532 static void create_le_conn_complete(struct hci_dev *hdev, u8 status)
 533 {
 534         struct hci_conn *conn;
 535
 536         if (status == 0)
 537                 return;
 538
 539         BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
 540                status);
 541
 542         hci_dev_lock(hdev);
 543
 544         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 545         if (!conn)
 546                 goto done;
 547
 548         hci_le_conn_failed(conn, status);
 549
 550 done:
 551         hci_dev_unlock(hdev);
 552 }
 553
 554 static int hci_create_le_conn(struct hci_conn *conn)
 555 {
 556         struct hci_dev *hdev = conn->hdev;
 557         struct hci_cp_le_create_conn cp;
 558         struct hci_request req;
 559         u8 own_addr_type;
 560         int err;
 561
 562         hci_req_init(&req, hdev);
 563
 564         memset(&cp, 0, sizeof(cp));
 565
 566         /* Update random address, but set require_privacy to false so
 567          * that we never connect with an unresolvable address.
 568          */
 569         err = hci_update_random_address(&req, false, &own_addr_type);
 570         if (err < 0)
 571                 return err;
 572
 573         conn->src_type = own_addr_type;
 574
 575         cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
 576         cp.scan_window = cpu_to_le16(hdev->le_scan_window);
 577         bacpy(&cp.peer_addr, &conn->dst);
 578         cp.peer_addr_type = conn->dst_type;
 579         cp.own_address_type = own_addr_type;
 580         cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 581         cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 582         cp.supervision_timeout = __constant_cpu_to_le16(0x002a);
 583         cp.min_ce_len = __constant_cpu_to_le16(0x0000);
 584         cp.max_ce_len = __constant_cpu_to_le16(0x0000);
 585
 586         hci_req_add(&req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 587
 588         err = hci_req_run(&req, create_le_conn_complete);
 589         if (err) {
 590                 hci_conn_del(conn);
 591                 return err;
 592         }
 593
 594         return 0;
 595 }
 596
 597 static struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 598                                     u8 dst_type, u8 sec_level, u8 auth_type)
 599 {
 600         struct hci_conn_params *params;
 601         struct hci_conn *conn;
 602         struct smp_irk *irk;
 603         int err;
 604
 605         if (test_bit(HCI_ADVERTISING, &hdev->flags))
 606                 return ERR_PTR(-ENOTSUPP);
 607
 608         /* Some devices send ATT messages as soon as the physical link is
 609          * established. To be able to handle these ATT messages, the user-
 610          * space first establishes the connection and then starts the pairing
 611          * process.
 612          *
 613          * So if a hci_conn object already exists for the following connection
 614          * attempt, we simply update pending_sec_level and auth_type fields
 615          * and return the object found.
 616          */
 617         conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
 618         if (conn) {
 619                 conn->pending_sec_level = sec_level;
 620                 conn->auth_type = auth_type;
 621                 goto done;
 622         }
 623
 624         /* Since the controller supports only one LE connection attempt at a
 625          * time, we return -EBUSY if there is any connection attempt running.
 626          */
 627         conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
 628         if (conn)
 629                 return ERR_PTR(-EBUSY);
 630
 631         /* Convert from L2CAP channel address type to HCI address type */
 632         if (dst_type == BDADDR_LE_PUBLIC)
 633                 dst_type = ADDR_LE_DEV_PUBLIC;
 634         else
 635                 dst_type = ADDR_LE_DEV_RANDOM;
 636
 637         /* When given an identity address with existing identity
 638          * resolving key, the connection needs to be established
 639          * to a resolvable random address.
 640          *
 641          * This uses the cached random resolvable address from
 642          * a previous scan. When no cached address is available,
 643          * try connecting to the identity address instead.
 644          *
 645          * Storing the resolvable random address is required here
 646          * to handle connection failures. The address will later
 647          * be resolved back into the original identity address
 648          * from the connect request.
 649          */
 650         irk = hci_find_irk_by_addr(hdev, dst, dst_type);
 651         if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
 652                 dst = &irk->rpa;
 653                 dst_type = ADDR_LE_DEV_RANDOM;
 654         }
 655
 656         conn = hci_conn_add(hdev, LE_LINK, dst);
 657         if (!conn)
 658                 return ERR_PTR(-ENOMEM);
 659
 660         conn->dst_type = dst_type;
 661
 662         conn->state = BT_CONNECT;
 663         conn->out = true;
 664         conn->link_mode |= HCI_LM_MASTER;
 665         conn->sec_level = BT_SECURITY_LOW;
 666         conn->pending_sec_level = sec_level;
 667         conn->auth_type = auth_type;
 668
 669         params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 670         if (params) {
 671                 conn->le_conn_min_interval = params->conn_min_interval;
 672                 conn->le_conn_max_interval = params->conn_max_interval;
 673         } else {
 674                 conn->le_conn_min_interval = hdev->le_conn_min_interval;
 675                 conn->le_conn_max_interval = hdev->le_conn_max_interval;
 676         }
 677
 678         err = hci_create_le_conn(conn);
 679         if (err)
 680                 return ERR_PTR(err);
 681
 682 done:
 683         hci_conn_hold(conn);
 684         return conn;
 685 }
 686
 687 static struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
 688                                                 u8 sec_level, u8 auth_type)
 689 {
 690         struct hci_conn *acl;
 691
 692         if (!test_bit(HCI_BREDR_ENABLED, &hdev->dev_flags))
 693                 return ERR_PTR(-ENOTSUPP);
 694
 695         acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
 696         if (!acl) {
 697                 acl = hci_conn_add(hdev, ACL_LINK, dst);
 698                 if (!acl)
 699                         return ERR_PTR(-ENOMEM);
 700         }
 701
 702         hci_conn_hold(acl);
 703
 704         if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
 705                 acl->sec_level = BT_SECURITY_LOW;
 706                 acl->pending_sec_level = sec_level;
 707                 acl->auth_type = auth_type;
 708                 hci_acl_create_connection(acl);
 709         }
 710
 711         return acl;
 712 }
 713
 714 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
 715                                  __u16 setting)
 716 {
 717         struct hci_conn *acl;
 718         struct hci_conn *sco;
 719
 720         acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
 721         if (IS_ERR(acl))
 722                 return acl;
 723
 724         sco = hci_conn_hash_lookup_ba(hdev, type, dst);
 725         if (!sco) {
 726                 sco = hci_conn_add(hdev, type, dst);
 727                 if (!sco) {
 728                         hci_conn_drop(acl);
 729                         return ERR_PTR(-ENOMEM);
 730                 }
 731         }
 732
 733         acl->link = sco;
 734         sco->link = acl;
 735
 736         hci_conn_hold(sco);
 737
 738         sco->setting = setting;
 739
 740         if (acl->state == BT_CONNECTED &&
 741             (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
 742                 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
 743                 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
 744
 745                 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
 746                         /* defer SCO setup until mode change completed */
 747                         set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
 748                         return sco;
 749                 }
 750
 751                 hci_sco_setup(acl, 0x00);
 752         }
 753
 754         return sco;
 755 }
 756
 757 /* Create SCO, ACL or LE connection. */
 758 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst,
 759                              __u8 dst_type, __u8 sec_level, __u8 auth_type)
 760 {
 761         BT_DBG("%s dst %pMR type 0x%x", hdev->name, dst, type);
 762
 763         switch (type) {
 764         case LE_LINK:
 765                 return hci_connect_le(hdev, dst, dst_type, sec_level, auth_type);
 766         case ACL_LINK:
 767                 return hci_connect_acl(hdev, dst, sec_level, auth_type);
 768         }
 769
 770         return ERR_PTR(-EINVAL);
 771 }
 772
 773 /* Check link security requirement */
 774 int hci_conn_check_link_mode(struct hci_conn *conn)
 775 {
 776         BT_DBG("hcon %p", conn);
 777
 778         if (hci_conn_ssp_enabled(conn) && !(conn->link_mode & HCI_LM_ENCRYPT))
 779                 return 0;
 780
 781         return 1;
 782 }
 783
 784 /* Authenticate remote device */
 785 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 786 {
 787         BT_DBG("hcon %p", conn);
 788
 789         if (conn->pending_sec_level > sec_level)
 790                 sec_level = conn->pending_sec_level;
 791
 792         if (sec_level > conn->sec_level)
 793                 conn->pending_sec_level = sec_level;
 794         else if (conn->link_mode & HCI_LM_AUTH)
 795                 return 1;
 796
 797         /* Make sure we preserve an existing MITM requirement*/
 798         auth_type |= (conn->auth_type & 0x01);
 799
 800         conn->auth_type = auth_type;
 801
 802         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 803                 struct hci_cp_auth_requested cp;
 804
 805                 /* encrypt must be pending if auth is also pending */
 806                 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
 807
 808                 cp.handle = cpu_to_le16(conn->handle);
 809                 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
 810                              sizeof(cp), &cp);
 811                 if (conn->key_type != 0xff)
 812                         set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
 813         }
 814
 815         return 0;
 816 }
 817
 818 /* Encrypt the the link */
 819 static void hci_conn_encrypt(struct hci_conn *conn)
 820 {
 821         BT_DBG("hcon %p", conn);
 822
 823         if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
 824                 struct hci_cp_set_conn_encrypt cp;
 825                 cp.handle  = cpu_to_le16(conn->handle);
 826                 cp.encrypt = 0x01;
 827                 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
 828                              &cp);
 829         }
 830 }
 831
 832 /* Enable security */
 833 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
 834 {
 835         BT_DBG("hcon %p", conn);
 836
 837         if (conn->type == LE_LINK)
 838                 return smp_conn_security(conn, sec_level);
 839
 840         /* For sdp we don't need the link key. */
 841         if (sec_level == BT_SECURITY_SDP)
 842                 return 1;
 843
 844         /* For non 2.1 devices and low security level we don't need the link
 845            key. */
 846         if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
 847                 return 1;
 848
 849         /* For other security levels we need the link key. */
 850         if (!(conn->link_mode & HCI_LM_AUTH))
 851                 goto auth;
 852
 853         /* An authenticated FIPS approved combination key has sufficient
 854          * security for security level 4. */
 855         if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
 856             sec_level == BT_SECURITY_FIPS)
 857                 goto encrypt;
 858
 859         /* An authenticated combination key has sufficient security for
 860            security level 3. */
 861         if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
 862              conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
 863             sec_level == BT_SECURITY_HIGH)
 864                 goto encrypt;
 865
 866         /* An unauthenticated combination key has sufficient security for
 867            security level 1 and 2. */
 868         if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
 869              conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
 870             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
 871                 goto encrypt;
 872
 873         /* A combination key has always sufficient security for the security
 874            levels 1 or 2. High security level requires the combination key
 875            is generated using maximum PIN code length (16).
 876            For pre 2.1 units. */
 877         if (conn->key_type == HCI_LK_COMBINATION &&
 878             (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
 879              conn->pin_length == 16))
 880                 goto encrypt;
 881
 882 auth:
 883         if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
 884                 return 0;
 885
 886         if (!hci_conn_auth(conn, sec_level, auth_type))
 887                 return 0;
 888
 889 encrypt:
 890         if (conn->link_mode & HCI_LM_ENCRYPT)
 891                 return 1;
 892
 893         hci_conn_encrypt(conn);
 894         return 0;
 895 }
 896 EXPORT_SYMBOL(hci_conn_security);
 897
 898 /* Check secure link requirement */
 899 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
 900 {
 901         BT_DBG("hcon %p", conn);
 902
 903         /* Accept if non-secure or higher security level is required */
 904         if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
 905                 return 1;
 906
 907         /* Accept if secure or higher security level is already present */
 908         if (conn->sec_level == BT_SECURITY_HIGH ||
 909             conn->sec_level == BT_SECURITY_FIPS)
 910                 return 1;
 911
 912         /* Reject not secure link */
 913         return 0;
 914 }
 915 EXPORT_SYMBOL(hci_conn_check_secure);
 916
 917 /* Change link key */
 918 int hci_conn_change_link_key(struct hci_conn *conn)
 919 {
 920         BT_DBG("hcon %p", conn);
 921
 922         if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
 923                 struct hci_cp_change_conn_link_key cp;
 924                 cp.handle = cpu_to_le16(conn->handle);
 925                 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
 926                              sizeof(cp), &cp);
 927         }
 928
 929         return 0;
 930 }
 931
 932 /* Switch role */
 933 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
 934 {
 935         BT_DBG("hcon %p", conn);
 936
 937         if (!role && conn->link_mode & HCI_LM_MASTER)
 938                 return 1;
 939
 940         if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
 941                 struct hci_cp_switch_role cp;
 942                 bacpy(&cp.bdaddr, &conn->dst);
 943                 cp.role = role;
 944                 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
 945         }
 946
 947         return 0;
 948 }
 949 EXPORT_SYMBOL(hci_conn_switch_role);
 950
 951 /* Enter active mode */
 952 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
 953 {
 954         struct hci_dev *hdev = conn->hdev;
 955
 956         BT_DBG("hcon %p mode %d", conn, conn->mode);
 957
 958         if (test_bit(HCI_RAW, &hdev->flags))
 959                 return;
 960
 961         if (conn->mode != HCI_CM_SNIFF)
 962                 goto timer;
 963
 964         if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
 965                 goto timer;
 966
 967         if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 968                 struct hci_cp_exit_sniff_mode cp;
 969                 cp.handle = cpu_to_le16(conn->handle);
 970                 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
 971         }
 972
 973 timer:
 974         if (hdev->idle_timeout > 0)
 975                 queue_delayed_work(hdev->workqueue, &conn->idle_work,
 976                                    msecs_to_jiffies(hdev->idle_timeout));
 977 }
 978
 979 /* Drop all connection on the device */
 980 void hci_conn_hash_flush(struct hci_dev *hdev)
 981 {
 982         struct hci_conn_hash *h = &hdev->conn_hash;
 983         struct hci_conn *c, *n;
 984
 985         BT_DBG("hdev %s", hdev->name);
 986
 987         list_for_each_entry_safe(c, n, &h->list, list) {
 988                 c->state = BT_CLOSED;
 989
 990                 hci_proto_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
 991                 hci_conn_del(c);
 992         }
 993 }
 994
 995 /* Check pending connect attempts */
 996 void hci_conn_check_pending(struct hci_dev *hdev)
 997 {
 998         struct hci_conn *conn;
 999
1000         BT_DBG("hdev %s", hdev->name);
1001
1002         hci_dev_lock(hdev);
1003
1004         conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1005         if (conn)
1006                 hci_acl_create_connection(conn);
1007
1008         hci_dev_unlock(hdev);
1009 }
1010
1011 int hci_get_conn_list(void __user *arg)
1012 {
1013         struct hci_conn *c;
1014         struct hci_conn_list_req req, *cl;
1015         struct hci_conn_info *ci;
1016         struct hci_dev *hdev;
1017         int n = 0, size, err;
1018
1019         if (copy_from_user(&req, arg, sizeof(req)))
1020                 return -EFAULT;
1021
1022         if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1023                 return -EINVAL;
1024
1025         size = sizeof(req) + req.conn_num * sizeof(*ci);
1026
1027         cl = kmalloc(size, GFP_KERNEL);
1028         if (!cl)
1029                 return -ENOMEM;
1030
1031         hdev = hci_dev_get(req.dev_id);
1032         if (!hdev) {
1033                 kfree(cl);
1034                 return -ENODEV;
1035         }
1036
1037         ci = cl->conn_info;
1038
1039         hci_dev_lock(hdev);
1040         list_for_each_entry(c, &hdev->conn_hash.list, list) {
1041                 bacpy(&(ci + n)->bdaddr, &c->dst);
1042                 (ci + n)->handle = c->handle;
1043                 (ci + n)->type  = c->type;
1044                 (ci + n)->out   = c->out;
1045                 (ci + n)->state = c->state;
1046                 (ci + n)->link_mode = c->link_mode;
1047                 if (++n >= req.conn_num)
1048                         break;
1049         }
1050         hci_dev_unlock(hdev);
1051
1052         cl->dev_id = hdev->id;
1053         cl->conn_num = n;
1054         size = sizeof(req) + n * sizeof(*ci);
1055
1056         hci_dev_put(hdev);
1057
1058         err = copy_to_user(arg, cl, size);
1059         kfree(cl);
1060
1061         return err ? -EFAULT : 0;
1062 }
1063
1064 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1065 {
1066         struct hci_conn_info_req req;
1067         struct hci_conn_info ci;
1068         struct hci_conn *conn;
1069         char __user *ptr = arg + sizeof(req);
1070
1071         if (copy_from_user(&req, arg, sizeof(req)))
1072                 return -EFAULT;
1073
1074         hci_dev_lock(hdev);
1075         conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1076         if (conn) {
1077                 bacpy(&ci.bdaddr, &conn->dst);
1078                 ci.handle = conn->handle;
1079                 ci.type  = conn->type;
1080                 ci.out   = conn->out;
1081                 ci.state = conn->state;
1082                 ci.link_mode = conn->link_mode;
1083         }
1084         hci_dev_unlock(hdev);
1085
1086         if (!conn)
1087                 return -ENOENT;
1088
1089         return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1090 }
1091
1092 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1093 {
1094         struct hci_auth_info_req req;
1095         struct hci_conn *conn;
1096
1097         if (copy_from_user(&req, arg, sizeof(req)))
1098                 return -EFAULT;
1099
1100         hci_dev_lock(hdev);
1101         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1102         if (conn)
1103                 req.type = conn->auth_type;
1104         hci_dev_unlock(hdev);
1105
1106         if (!conn)
1107                 return -ENOENT;
1108
1109         return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1110 }
1111
1112 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1113 {
1114         struct hci_dev *hdev = conn->hdev;
1115         struct hci_chan *chan;
1116
1117         BT_DBG("%s hcon %p", hdev->name, conn);
1118
1119         chan = kzalloc(sizeof(struct hci_chan), GFP_KERNEL);
1120         if (!chan)
1121                 return NULL;
1122
1123         chan->conn = conn;
1124         skb_queue_head_init(&chan->data_q);
1125         chan->state = BT_CONNECTED;
1126
1127         list_add_rcu(&chan->list, &conn->chan_list);
1128
1129         return chan;
1130 }
1131
1132 void hci_chan_del(struct hci_chan *chan)
1133 {
1134         struct hci_conn *conn = chan->conn;
1135         struct hci_dev *hdev = conn->hdev;
1136
1137         BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1138
1139         list_del_rcu(&chan->list);
1140
1141         synchronize_rcu();
1142
1143         hci_conn_drop(conn);
1144
1145         skb_queue_purge(&chan->data_q);
1146         kfree(chan);
1147 }
1148
1149 void hci_chan_list_flush(struct hci_conn *conn)
1150 {
1151         struct hci_chan *chan, *n;
1152
1153         BT_DBG("hcon %p", conn);
1154
1155         list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1156                 hci_chan_del(chan);
1157 }
1158
1159 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1160                                                  __u16 handle)
1161 {
1162         struct hci_chan *hchan;
1163
1164         list_for_each_entry(hchan, &hcon->chan_list, list) {
1165                 if (hchan->handle == handle)
1166                         return hchan;
1167         }
1168
1169         return NULL;
1170 }
1171
1172 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1173 {
1174         struct hci_conn_hash *h = &hdev->conn_hash;
1175         struct hci_conn *hcon;
1176         struct hci_chan *hchan = NULL;
1177
1178         rcu_read_lock();
1179
1180         list_for_each_entry_rcu(hcon, &h->list, list) {
1181                 hchan = __hci_chan_lookup_handle(hcon, handle);
1182                 if (hchan)
1183                         break;
1184         }
1185
1186         rcu_read_unlock();
1187
1188         return hchan;
1189 }