1 /* 2 BlueZ - Bluetooth protocol stack for Linux 3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved. 4 5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License version 2 as 9 published by the Free Software Foundation; 10 11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 22 SOFTWARE IS DISCLAIMED. 23 */ 24 25 /* Bluetooth HCI connection handling. */ 26 27 #include <linux/export.h> 28 #include <linux/debugfs.h> 29 30 #include <net/bluetooth/bluetooth.h> 31 #include <net/bluetooth/hci_core.h> 32 #include <net/bluetooth/l2cap.h> 33 34 #include "hci_request.h" 35 #include "smp.h" 36 #include "a2mp.h" 37 38 struct sco_param { 39 u16 pkt_type; 40 u16 max_latency; 41 u8 retrans_effort; 42 }; 43 44 static const struct sco_param esco_param_cvsd[] = { 45 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */ 46 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */ 47 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */ 48 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */ 49 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */ 50 }; 51 52 static const struct sco_param sco_param_cvsd[] = { 53 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */ 54 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */ 55 }; 56 57 static const struct sco_param esco_param_msbc[] = { 58 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */ 59 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */ 60 }; 61 62 /* This function requires the caller holds hdev->lock */ 63 static void hci_connect_le_scan_cleanup(struct hci_conn *conn) 64 { 65 struct hci_conn_params *params; 66 struct hci_dev *hdev = conn->hdev; 67 struct smp_irk *irk; 68 bdaddr_t *bdaddr; 69 u8 bdaddr_type; 70 71 bdaddr = &conn->dst; 72 bdaddr_type = conn->dst_type; 73 74 /* Check if we need to convert to identity address */ 75 irk = hci_get_irk(hdev, bdaddr, bdaddr_type); 76 if (irk) { 77 bdaddr = &irk->bdaddr; 78 bdaddr_type = irk->addr_type; 79 } 80 81 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr, 82 bdaddr_type); 83 if (!params || !params->explicit_connect) 84 return; 85 86 /* The connection attempt was doing scan for new RPA, and is 87 * in scan phase. If params are not associated with any other 88 * autoconnect action, remove them completely. If they are, just unmark 89 * them as waiting for connection, by clearing explicit_connect field. 90 */ 91 params->explicit_connect = false; 92 93 list_del_init(¶ms->action); 94 95 switch (params->auto_connect) { 96 case HCI_AUTO_CONN_EXPLICIT: 97 hci_conn_params_del(hdev, bdaddr, bdaddr_type); 98 /* return instead of break to avoid duplicate scan update */ 99 return; 100 case HCI_AUTO_CONN_DIRECT: 101 case HCI_AUTO_CONN_ALWAYS: 102 list_add(¶ms->action, &hdev->pend_le_conns); 103 break; 104 case HCI_AUTO_CONN_REPORT: 105 list_add(¶ms->action, &hdev->pend_le_reports); 106 break; 107 default: 108 break; 109 } 110 111 hci_update_background_scan(hdev); 112 } 113 114 static void hci_conn_cleanup(struct hci_conn *conn) 115 { 116 struct hci_dev *hdev = conn->hdev; 117 118 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags)) 119 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type); 120 121 hci_chan_list_flush(conn); 122 123 hci_conn_hash_del(hdev, conn); 124 125 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) { 126 switch (conn->setting & SCO_AIRMODE_MASK) { 127 case SCO_AIRMODE_CVSD: 128 case SCO_AIRMODE_TRANSP: 129 if (hdev->notify) 130 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO); 131 break; 132 } 133 } else { 134 if (hdev->notify) 135 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL); 136 } 137 138 hci_conn_del_sysfs(conn); 139 140 debugfs_remove_recursive(conn->debugfs); 141 142 hci_dev_put(hdev); 143 144 hci_conn_put(conn); 145 } 146 147 static void le_scan_cleanup(struct work_struct *work) 148 { 149 struct hci_conn *conn = container_of(work, struct hci_conn, 150 le_scan_cleanup); 151 struct hci_dev *hdev = conn->hdev; 152 struct hci_conn *c = NULL; 153 154 BT_DBG("%s hcon %p", hdev->name, conn); 155 156 hci_dev_lock(hdev); 157 158 /* Check that the hci_conn is still around */ 159 rcu_read_lock(); 160 list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) { 161 if (c == conn) 162 break; 163 } 164 rcu_read_unlock(); 165 166 if (c == conn) { 167 hci_connect_le_scan_cleanup(conn); 168 hci_conn_cleanup(conn); 169 } 170 171 hci_dev_unlock(hdev); 172 hci_dev_put(hdev); 173 hci_conn_put(conn); 174 } 175 176 static void hci_connect_le_scan_remove(struct hci_conn *conn) 177 { 178 BT_DBG("%s hcon %p", conn->hdev->name, conn); 179 180 /* We can't call hci_conn_del/hci_conn_cleanup here since that 181 * could deadlock with another hci_conn_del() call that's holding 182 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work). 183 * Instead, grab temporary extra references to the hci_dev and 184 * hci_conn and perform the necessary cleanup in a separate work 185 * callback. 186 */ 187 188 hci_dev_hold(conn->hdev); 189 hci_conn_get(conn); 190 191 /* Even though we hold a reference to the hdev, many other 192 * things might get cleaned up meanwhile, including the hdev's 193 * own workqueue, so we can't use that for scheduling. 194 */ 195 schedule_work(&conn->le_scan_cleanup); 196 } 197 198 static void hci_acl_create_connection(struct hci_conn *conn) 199 { 200 struct hci_dev *hdev = conn->hdev; 201 struct inquiry_entry *ie; 202 struct hci_cp_create_conn cp; 203 204 BT_DBG("hcon %p", conn); 205 206 /* Many controllers disallow HCI Create Connection while it is doing 207 * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create 208 * Connection. This may cause the MGMT discovering state to become false 209 * without user space's request but it is okay since the MGMT Discovery 210 * APIs do not promise that discovery should be done forever. Instead, 211 * the user space monitors the status of MGMT discovering and it may 212 * request for discovery again when this flag becomes false. 213 */ 214 if (test_bit(HCI_INQUIRY, &hdev->flags)) { 215 /* Put this connection to "pending" state so that it will be 216 * executed after the inquiry cancel command complete event. 217 */ 218 conn->state = BT_CONNECT2; 219 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL); 220 return; 221 } 222 223 conn->state = BT_CONNECT; 224 conn->out = true; 225 conn->role = HCI_ROLE_MASTER; 226 227 conn->attempt++; 228 229 conn->link_policy = hdev->link_policy; 230 231 memset(&cp, 0, sizeof(cp)); 232 bacpy(&cp.bdaddr, &conn->dst); 233 cp.pscan_rep_mode = 0x02; 234 235 ie = hci_inquiry_cache_lookup(hdev, &conn->dst); 236 if (ie) { 237 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) { 238 cp.pscan_rep_mode = ie->data.pscan_rep_mode; 239 cp.pscan_mode = ie->data.pscan_mode; 240 cp.clock_offset = ie->data.clock_offset | 241 cpu_to_le16(0x8000); 242 } 243 244 memcpy(conn->dev_class, ie->data.dev_class, 3); 245 } 246 247 cp.pkt_type = cpu_to_le16(conn->pkt_type); 248 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER)) 249 cp.role_switch = 0x01; 250 else 251 cp.role_switch = 0x00; 252 253 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp); 254 } 255 256 int hci_disconnect(struct hci_conn *conn, __u8 reason) 257 { 258 BT_DBG("hcon %p", conn); 259 260 /* When we are master of an established connection and it enters 261 * the disconnect timeout, then go ahead and try to read the 262 * current clock offset. Processing of the result is done 263 * within the event handling and hci_clock_offset_evt function. 264 */ 265 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER && 266 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) { 267 struct hci_dev *hdev = conn->hdev; 268 struct hci_cp_read_clock_offset clkoff_cp; 269 270 clkoff_cp.handle = cpu_to_le16(conn->handle); 271 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp), 272 &clkoff_cp); 273 } 274 275 return hci_abort_conn(conn, reason); 276 } 277 278 static void hci_add_sco(struct hci_conn *conn, __u16 handle) 279 { 280 struct hci_dev *hdev = conn->hdev; 281 struct hci_cp_add_sco cp; 282 283 BT_DBG("hcon %p", conn); 284 285 conn->state = BT_CONNECT; 286 conn->out = true; 287 288 conn->attempt++; 289 290 cp.handle = cpu_to_le16(handle); 291 cp.pkt_type = cpu_to_le16(conn->pkt_type); 292 293 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp); 294 } 295 296 static bool find_next_esco_param(struct hci_conn *conn, 297 const struct sco_param *esco_param, int size) 298 { 299 for (; conn->attempt <= size; conn->attempt++) { 300 if (lmp_esco_2m_capable(conn->link) || 301 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3)) 302 break; 303 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported", 304 conn, conn->attempt); 305 } 306 307 return conn->attempt <= size; 308 } 309 310 bool hci_setup_sync(struct hci_conn *conn, __u16 handle) 311 { 312 struct hci_dev *hdev = conn->hdev; 313 struct hci_cp_setup_sync_conn cp; 314 const struct sco_param *param; 315 316 BT_DBG("hcon %p", conn); 317 318 conn->state = BT_CONNECT; 319 conn->out = true; 320 321 conn->attempt++; 322 323 cp.handle = cpu_to_le16(handle); 324 325 cp.tx_bandwidth = cpu_to_le32(0x00001f40); 326 cp.rx_bandwidth = cpu_to_le32(0x00001f40); 327 cp.voice_setting = cpu_to_le16(conn->setting); 328 329 switch (conn->setting & SCO_AIRMODE_MASK) { 330 case SCO_AIRMODE_TRANSP: 331 if (!find_next_esco_param(conn, esco_param_msbc, 332 ARRAY_SIZE(esco_param_msbc))) 333 return false; 334 param = &esco_param_msbc[conn->attempt - 1]; 335 break; 336 case SCO_AIRMODE_CVSD: 337 if (lmp_esco_capable(conn->link)) { 338 if (!find_next_esco_param(conn, esco_param_cvsd, 339 ARRAY_SIZE(esco_param_cvsd))) 340 return false; 341 param = &esco_param_cvsd[conn->attempt - 1]; 342 } else { 343 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd)) 344 return false; 345 param = &sco_param_cvsd[conn->attempt - 1]; 346 } 347 break; 348 default: 349 return false; 350 } 351 352 cp.retrans_effort = param->retrans_effort; 353 cp.pkt_type = __cpu_to_le16(param->pkt_type); 354 cp.max_latency = __cpu_to_le16(param->max_latency); 355 356 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0) 357 return false; 358 359 return true; 360 } 361 362 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency, 363 u16 to_multiplier) 364 { 365 struct hci_dev *hdev = conn->hdev; 366 struct hci_conn_params *params; 367 struct hci_cp_le_conn_update cp; 368 369 hci_dev_lock(hdev); 370 371 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type); 372 if (params) { 373 params->conn_min_interval = min; 374 params->conn_max_interval = max; 375 params->conn_latency = latency; 376 params->supervision_timeout = to_multiplier; 377 } 378 379 hci_dev_unlock(hdev); 380 381 memset(&cp, 0, sizeof(cp)); 382 cp.handle = cpu_to_le16(conn->handle); 383 cp.conn_interval_min = cpu_to_le16(min); 384 cp.conn_interval_max = cpu_to_le16(max); 385 cp.conn_latency = cpu_to_le16(latency); 386 cp.supervision_timeout = cpu_to_le16(to_multiplier); 387 cp.min_ce_len = cpu_to_le16(0x0000); 388 cp.max_ce_len = cpu_to_le16(0x0000); 389 390 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp); 391 392 if (params) 393 return 0x01; 394 395 return 0x00; 396 } 397 398 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand, 399 __u8 ltk[16], __u8 key_size) 400 { 401 struct hci_dev *hdev = conn->hdev; 402 struct hci_cp_le_start_enc cp; 403 404 BT_DBG("hcon %p", conn); 405 406 memset(&cp, 0, sizeof(cp)); 407 408 cp.handle = cpu_to_le16(conn->handle); 409 cp.rand = rand; 410 cp.ediv = ediv; 411 memcpy(cp.ltk, ltk, key_size); 412 413 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp); 414 } 415 416 /* Device _must_ be locked */ 417 void hci_sco_setup(struct hci_conn *conn, __u8 status) 418 { 419 struct hci_conn *sco = conn->link; 420 421 if (!sco) 422 return; 423 424 BT_DBG("hcon %p", conn); 425 426 if (!status) { 427 if (lmp_esco_capable(conn->hdev)) 428 hci_setup_sync(sco, conn->handle); 429 else 430 hci_add_sco(sco, conn->handle); 431 } else { 432 hci_connect_cfm(sco, status); 433 hci_conn_del(sco); 434 } 435 } 436 437 static void hci_conn_timeout(struct work_struct *work) 438 { 439 struct hci_conn *conn = container_of(work, struct hci_conn, 440 disc_work.work); 441 int refcnt = atomic_read(&conn->refcnt); 442 443 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state)); 444 445 WARN_ON(refcnt < 0); 446 447 /* FIXME: It was observed that in pairing failed scenario, refcnt 448 * drops below 0. Probably this is because l2cap_conn_del calls 449 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is 450 * dropped. After that loop hci_chan_del is called which also drops 451 * conn. For now make sure that ACL is alive if refcnt is higher then 0, 452 * otherwise drop it. 453 */ 454 if (refcnt > 0) 455 return; 456 457 /* LE connections in scanning state need special handling */ 458 if (conn->state == BT_CONNECT && conn->type == LE_LINK && 459 test_bit(HCI_CONN_SCANNING, &conn->flags)) { 460 hci_connect_le_scan_remove(conn); 461 return; 462 } 463 464 hci_abort_conn(conn, hci_proto_disconn_ind(conn)); 465 } 466 467 /* Enter sniff mode */ 468 static void hci_conn_idle(struct work_struct *work) 469 { 470 struct hci_conn *conn = container_of(work, struct hci_conn, 471 idle_work.work); 472 struct hci_dev *hdev = conn->hdev; 473 474 BT_DBG("hcon %p mode %d", conn, conn->mode); 475 476 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn)) 477 return; 478 479 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF)) 480 return; 481 482 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) { 483 struct hci_cp_sniff_subrate cp; 484 cp.handle = cpu_to_le16(conn->handle); 485 cp.max_latency = cpu_to_le16(0); 486 cp.min_remote_timeout = cpu_to_le16(0); 487 cp.min_local_timeout = cpu_to_le16(0); 488 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp); 489 } 490 491 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { 492 struct hci_cp_sniff_mode cp; 493 cp.handle = cpu_to_le16(conn->handle); 494 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval); 495 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval); 496 cp.attempt = cpu_to_le16(4); 497 cp.timeout = cpu_to_le16(1); 498 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp); 499 } 500 } 501 502 static void hci_conn_auto_accept(struct work_struct *work) 503 { 504 struct hci_conn *conn = container_of(work, struct hci_conn, 505 auto_accept_work.work); 506 507 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst), 508 &conn->dst); 509 } 510 511 static void le_disable_advertising(struct hci_dev *hdev) 512 { 513 if (ext_adv_capable(hdev)) { 514 struct hci_cp_le_set_ext_adv_enable cp; 515 516 cp.enable = 0x00; 517 cp.num_of_sets = 0x00; 518 519 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp), 520 &cp); 521 } else { 522 u8 enable = 0x00; 523 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), 524 &enable); 525 } 526 } 527 528 static void le_conn_timeout(struct work_struct *work) 529 { 530 struct hci_conn *conn = container_of(work, struct hci_conn, 531 le_conn_timeout.work); 532 struct hci_dev *hdev = conn->hdev; 533 534 BT_DBG(""); 535 536 /* We could end up here due to having done directed advertising, 537 * so clean up the state if necessary. This should however only 538 * happen with broken hardware or if low duty cycle was used 539 * (which doesn't have a timeout of its own). 540 */ 541 if (conn->role == HCI_ROLE_SLAVE) { 542 /* Disable LE Advertising */ 543 le_disable_advertising(hdev); 544 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT); 545 return; 546 } 547 548 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM); 549 } 550 551 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst, 552 u8 role) 553 { 554 struct hci_conn *conn; 555 556 BT_DBG("%s dst %pMR", hdev->name, dst); 557 558 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 559 if (!conn) 560 return NULL; 561 562 bacpy(&conn->dst, dst); 563 bacpy(&conn->src, &hdev->bdaddr); 564 conn->hdev = hdev; 565 conn->type = type; 566 conn->role = role; 567 conn->mode = HCI_CM_ACTIVE; 568 conn->state = BT_OPEN; 569 conn->auth_type = HCI_AT_GENERAL_BONDING; 570 conn->io_capability = hdev->io_capability; 571 conn->remote_auth = 0xff; 572 conn->key_type = 0xff; 573 conn->rssi = HCI_RSSI_INVALID; 574 conn->tx_power = HCI_TX_POWER_INVALID; 575 conn->max_tx_power = HCI_TX_POWER_INVALID; 576 577 set_bit(HCI_CONN_POWER_SAVE, &conn->flags); 578 conn->disc_timeout = HCI_DISCONN_TIMEOUT; 579 580 /* Set Default Authenticated payload timeout to 30s */ 581 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT; 582 583 if (conn->role == HCI_ROLE_MASTER) 584 conn->out = true; 585 586 switch (type) { 587 case ACL_LINK: 588 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK; 589 break; 590 case LE_LINK: 591 /* conn->src should reflect the local identity address */ 592 hci_copy_identity_address(hdev, &conn->src, &conn->src_type); 593 break; 594 case SCO_LINK: 595 if (lmp_esco_capable(hdev)) 596 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) | 597 (hdev->esco_type & EDR_ESCO_MASK); 598 else 599 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK; 600 break; 601 case ESCO_LINK: 602 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK; 603 break; 604 } 605 606 skb_queue_head_init(&conn->data_q); 607 608 INIT_LIST_HEAD(&conn->chan_list); 609 610 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout); 611 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept); 612 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle); 613 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout); 614 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup); 615 616 atomic_set(&conn->refcnt, 0); 617 618 hci_dev_hold(hdev); 619 620 hci_conn_hash_add(hdev, conn); 621 622 /* The SCO and eSCO connections will only be notified when their 623 * setup has been completed. This is different to ACL links which 624 * can be notified right away. 625 */ 626 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) { 627 if (hdev->notify) 628 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD); 629 } 630 631 hci_conn_init_sysfs(conn); 632 633 return conn; 634 } 635 636 int hci_conn_del(struct hci_conn *conn) 637 { 638 struct hci_dev *hdev = conn->hdev; 639 640 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle); 641 642 cancel_delayed_work_sync(&conn->disc_work); 643 cancel_delayed_work_sync(&conn->auto_accept_work); 644 cancel_delayed_work_sync(&conn->idle_work); 645 646 if (conn->type == ACL_LINK) { 647 struct hci_conn *sco = conn->link; 648 if (sco) 649 sco->link = NULL; 650 651 /* Unacked frames */ 652 hdev->acl_cnt += conn->sent; 653 } else if (conn->type == LE_LINK) { 654 cancel_delayed_work(&conn->le_conn_timeout); 655 656 if (hdev->le_pkts) 657 hdev->le_cnt += conn->sent; 658 else 659 hdev->acl_cnt += conn->sent; 660 } else { 661 struct hci_conn *acl = conn->link; 662 if (acl) { 663 acl->link = NULL; 664 hci_conn_drop(acl); 665 } 666 } 667 668 if (conn->amp_mgr) 669 amp_mgr_put(conn->amp_mgr); 670 671 skb_queue_purge(&conn->data_q); 672 673 /* Remove the connection from the list and cleanup its remaining 674 * state. This is a separate function since for some cases like 675 * BT_CONNECT_SCAN we *only* want the cleanup part without the 676 * rest of hci_conn_del. 677 */ 678 hci_conn_cleanup(conn); 679 680 return 0; 681 } 682 683 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type) 684 { 685 int use_src = bacmp(src, BDADDR_ANY); 686 struct hci_dev *hdev = NULL, *d; 687 688 BT_DBG("%pMR -> %pMR", src, dst); 689 690 read_lock(&hci_dev_list_lock); 691 692 list_for_each_entry(d, &hci_dev_list, list) { 693 if (!test_bit(HCI_UP, &d->flags) || 694 hci_dev_test_flag(d, HCI_USER_CHANNEL) || 695 d->dev_type != HCI_PRIMARY) 696 continue; 697 698 /* Simple routing: 699 * No source address - find interface with bdaddr != dst 700 * Source address - find interface with bdaddr == src 701 */ 702 703 if (use_src) { 704 bdaddr_t id_addr; 705 u8 id_addr_type; 706 707 if (src_type == BDADDR_BREDR) { 708 if (!lmp_bredr_capable(d)) 709 continue; 710 bacpy(&id_addr, &d->bdaddr); 711 id_addr_type = BDADDR_BREDR; 712 } else { 713 if (!lmp_le_capable(d)) 714 continue; 715 716 hci_copy_identity_address(d, &id_addr, 717 &id_addr_type); 718 719 /* Convert from HCI to three-value type */ 720 if (id_addr_type == ADDR_LE_DEV_PUBLIC) 721 id_addr_type = BDADDR_LE_PUBLIC; 722 else 723 id_addr_type = BDADDR_LE_RANDOM; 724 } 725 726 if (!bacmp(&id_addr, src) && id_addr_type == src_type) { 727 hdev = d; break; 728 } 729 } else { 730 if (bacmp(&d->bdaddr, dst)) { 731 hdev = d; break; 732 } 733 } 734 } 735 736 if (hdev) 737 hdev = hci_dev_hold(hdev); 738 739 read_unlock(&hci_dev_list_lock); 740 return hdev; 741 } 742 EXPORT_SYMBOL(hci_get_route); 743 744 /* This function requires the caller holds hdev->lock */ 745 void hci_le_conn_failed(struct hci_conn *conn, u8 status) 746 { 747 struct hci_dev *hdev = conn->hdev; 748 struct hci_conn_params *params; 749 750 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst, 751 conn->dst_type); 752 if (params && params->conn) { 753 hci_conn_drop(params->conn); 754 hci_conn_put(params->conn); 755 params->conn = NULL; 756 } 757 758 conn->state = BT_CLOSED; 759 760 /* If the status indicates successful cancellation of 761 * the attempt (i.e. Unkown Connection Id) there's no point of 762 * notifying failure since we'll go back to keep trying to 763 * connect. The only exception is explicit connect requests 764 * where a timeout + cancel does indicate an actual failure. 765 */ 766 if (status != HCI_ERROR_UNKNOWN_CONN_ID || 767 (params && params->explicit_connect)) 768 mgmt_connect_failed(hdev, &conn->dst, conn->type, 769 conn->dst_type, status); 770 771 hci_connect_cfm(conn, status); 772 773 hci_conn_del(conn); 774 775 /* Since we may have temporarily stopped the background scanning in 776 * favor of connection establishment, we should restart it. 777 */ 778 hci_update_background_scan(hdev); 779 780 /* Re-enable advertising in case this was a failed connection 781 * attempt as a peripheral. 782 */ 783 hci_req_reenable_advertising(hdev); 784 } 785 786 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode) 787 { 788 struct hci_conn *conn; 789 790 hci_dev_lock(hdev); 791 792 conn = hci_lookup_le_connect(hdev); 793 794 if (hdev->adv_instance_cnt) 795 hci_req_resume_adv_instances(hdev); 796 797 if (!status) { 798 hci_connect_le_scan_cleanup(conn); 799 goto done; 800 } 801 802 bt_dev_err(hdev, "request failed to create LE connection: " 803 "status 0x%2.2x", status); 804 805 if (!conn) 806 goto done; 807 808 hci_le_conn_failed(conn, status); 809 810 done: 811 hci_dev_unlock(hdev); 812 } 813 814 static bool conn_use_rpa(struct hci_conn *conn) 815 { 816 struct hci_dev *hdev = conn->hdev; 817 818 return hci_dev_test_flag(hdev, HCI_PRIVACY); 819 } 820 821 static void set_ext_conn_params(struct hci_conn *conn, 822 struct hci_cp_le_ext_conn_param *p) 823 { 824 struct hci_dev *hdev = conn->hdev; 825 826 memset(p, 0, sizeof(*p)); 827 828 p->scan_interval = cpu_to_le16(hdev->le_scan_int_connect); 829 p->scan_window = cpu_to_le16(hdev->le_scan_window_connect); 830 p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval); 831 p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval); 832 p->conn_latency = cpu_to_le16(conn->le_conn_latency); 833 p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout); 834 p->min_ce_len = cpu_to_le16(0x0000); 835 p->max_ce_len = cpu_to_le16(0x0000); 836 } 837 838 static void hci_req_add_le_create_conn(struct hci_request *req, 839 struct hci_conn *conn, 840 bdaddr_t *direct_rpa) 841 { 842 struct hci_dev *hdev = conn->hdev; 843 u8 own_addr_type; 844 845 /* If direct address was provided we use it instead of current 846 * address. 847 */ 848 if (direct_rpa) { 849 if (bacmp(&req->hdev->random_addr, direct_rpa)) 850 hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6, 851 direct_rpa); 852 853 /* direct address is always RPA */ 854 own_addr_type = ADDR_LE_DEV_RANDOM; 855 } else { 856 /* Update random address, but set require_privacy to false so 857 * that we never connect with an non-resolvable address. 858 */ 859 if (hci_update_random_address(req, false, conn_use_rpa(conn), 860 &own_addr_type)) 861 return; 862 } 863 864 if (use_ext_conn(hdev)) { 865 struct hci_cp_le_ext_create_conn *cp; 866 struct hci_cp_le_ext_conn_param *p; 867 u8 data[sizeof(*cp) + sizeof(*p) * 3]; 868 u32 plen; 869 870 cp = (void *) data; 871 p = (void *) cp->data; 872 873 memset(cp, 0, sizeof(*cp)); 874 875 bacpy(&cp->peer_addr, &conn->dst); 876 cp->peer_addr_type = conn->dst_type; 877 cp->own_addr_type = own_addr_type; 878 879 plen = sizeof(*cp); 880 881 if (scan_1m(hdev)) { 882 cp->phys |= LE_SCAN_PHY_1M; 883 set_ext_conn_params(conn, p); 884 885 p++; 886 plen += sizeof(*p); 887 } 888 889 if (scan_2m(hdev)) { 890 cp->phys |= LE_SCAN_PHY_2M; 891 set_ext_conn_params(conn, p); 892 893 p++; 894 plen += sizeof(*p); 895 } 896 897 if (scan_coded(hdev)) { 898 cp->phys |= LE_SCAN_PHY_CODED; 899 set_ext_conn_params(conn, p); 900 901 plen += sizeof(*p); 902 } 903 904 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data); 905 906 } else { 907 struct hci_cp_le_create_conn cp; 908 909 memset(&cp, 0, sizeof(cp)); 910 911 cp.scan_interval = cpu_to_le16(hdev->le_scan_int_connect); 912 cp.scan_window = cpu_to_le16(hdev->le_scan_window_connect); 913 914 bacpy(&cp.peer_addr, &conn->dst); 915 cp.peer_addr_type = conn->dst_type; 916 cp.own_address_type = own_addr_type; 917 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval); 918 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval); 919 cp.conn_latency = cpu_to_le16(conn->le_conn_latency); 920 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout); 921 cp.min_ce_len = cpu_to_le16(0x0000); 922 cp.max_ce_len = cpu_to_le16(0x0000); 923 924 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp); 925 } 926 927 conn->state = BT_CONNECT; 928 clear_bit(HCI_CONN_SCANNING, &conn->flags); 929 } 930 931 static void hci_req_directed_advertising(struct hci_request *req, 932 struct hci_conn *conn) 933 { 934 struct hci_dev *hdev = req->hdev; 935 u8 own_addr_type; 936 u8 enable; 937 938 if (ext_adv_capable(hdev)) { 939 struct hci_cp_le_set_ext_adv_params cp; 940 bdaddr_t random_addr; 941 942 /* Set require_privacy to false so that the remote device has a 943 * chance of identifying us. 944 */ 945 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL, 946 &own_addr_type, &random_addr) < 0) 947 return; 948 949 memset(&cp, 0, sizeof(cp)); 950 951 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND); 952 cp.own_addr_type = own_addr_type; 953 cp.channel_map = hdev->le_adv_channel_map; 954 cp.tx_power = HCI_TX_POWER_INVALID; 955 cp.primary_phy = HCI_ADV_PHY_1M; 956 cp.secondary_phy = HCI_ADV_PHY_1M; 957 cp.handle = 0; /* Use instance 0 for directed adv */ 958 cp.own_addr_type = own_addr_type; 959 cp.peer_addr_type = conn->dst_type; 960 bacpy(&cp.peer_addr, &conn->dst); 961 962 /* As per Core Spec 5.2 Vol 2, PART E, Sec 7.8.53, for 963 * advertising_event_property LE_LEGACY_ADV_DIRECT_IND 964 * does not supports advertising data when the advertising set already 965 * contains some, the controller shall return erroc code 'Invalid 966 * HCI Command Parameters(0x12). 967 * So it is required to remove adv set for handle 0x00. since we use 968 * instance 0 for directed adv. 969 */ 970 __hci_req_remove_ext_adv_instance(req, cp.handle); 971 972 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp); 973 974 if (own_addr_type == ADDR_LE_DEV_RANDOM && 975 bacmp(&random_addr, BDADDR_ANY) && 976 bacmp(&random_addr, &hdev->random_addr)) { 977 struct hci_cp_le_set_adv_set_rand_addr cp; 978 979 memset(&cp, 0, sizeof(cp)); 980 981 cp.handle = 0; 982 bacpy(&cp.bdaddr, &random_addr); 983 984 hci_req_add(req, 985 HCI_OP_LE_SET_ADV_SET_RAND_ADDR, 986 sizeof(cp), &cp); 987 } 988 989 __hci_req_enable_ext_advertising(req, 0x00); 990 } else { 991 struct hci_cp_le_set_adv_param cp; 992 993 /* Clear the HCI_LE_ADV bit temporarily so that the 994 * hci_update_random_address knows that it's safe to go ahead 995 * and write a new random address. The flag will be set back on 996 * as soon as the SET_ADV_ENABLE HCI command completes. 997 */ 998 hci_dev_clear_flag(hdev, HCI_LE_ADV); 999 1000 /* Set require_privacy to false so that the remote device has a 1001 * chance of identifying us. 1002 */ 1003 if (hci_update_random_address(req, false, conn_use_rpa(conn), 1004 &own_addr_type) < 0) 1005 return; 1006 1007 memset(&cp, 0, sizeof(cp)); 1008 1009 /* Some controllers might reject command if intervals are not 1010 * within range for undirected advertising. 1011 * BCM20702A0 is known to be affected by this. 1012 */ 1013 cp.min_interval = cpu_to_le16(0x0020); 1014 cp.max_interval = cpu_to_le16(0x0020); 1015 1016 cp.type = LE_ADV_DIRECT_IND; 1017 cp.own_address_type = own_addr_type; 1018 cp.direct_addr_type = conn->dst_type; 1019 bacpy(&cp.direct_addr, &conn->dst); 1020 cp.channel_map = hdev->le_adv_channel_map; 1021 1022 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp); 1023 1024 enable = 0x01; 1025 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), 1026 &enable); 1027 } 1028 1029 conn->state = BT_CONNECT; 1030 } 1031 1032 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst, 1033 u8 dst_type, u8 sec_level, u16 conn_timeout, 1034 u8 role, bdaddr_t *direct_rpa) 1035 { 1036 struct hci_conn_params *params; 1037 struct hci_conn *conn; 1038 struct smp_irk *irk; 1039 struct hci_request req; 1040 int err; 1041 1042 /* This ensures that during disable le_scan address resolution 1043 * will not be disabled if it is followed by le_create_conn 1044 */ 1045 bool rpa_le_conn = true; 1046 1047 /* Let's make sure that le is enabled.*/ 1048 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 1049 if (lmp_le_capable(hdev)) 1050 return ERR_PTR(-ECONNREFUSED); 1051 1052 return ERR_PTR(-EOPNOTSUPP); 1053 } 1054 1055 /* Since the controller supports only one LE connection attempt at a 1056 * time, we return -EBUSY if there is any connection attempt running. 1057 */ 1058 if (hci_lookup_le_connect(hdev)) 1059 return ERR_PTR(-EBUSY); 1060 1061 /* If there's already a connection object but it's not in 1062 * scanning state it means it must already be established, in 1063 * which case we can't do anything else except report a failure 1064 * to connect. 1065 */ 1066 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type); 1067 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) { 1068 return ERR_PTR(-EBUSY); 1069 } 1070 1071 /* When given an identity address with existing identity 1072 * resolving key, the connection needs to be established 1073 * to a resolvable random address. 1074 * 1075 * Storing the resolvable random address is required here 1076 * to handle connection failures. The address will later 1077 * be resolved back into the original identity address 1078 * from the connect request. 1079 */ 1080 irk = hci_find_irk_by_addr(hdev, dst, dst_type); 1081 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) { 1082 dst = &irk->rpa; 1083 dst_type = ADDR_LE_DEV_RANDOM; 1084 } 1085 1086 if (conn) { 1087 bacpy(&conn->dst, dst); 1088 } else { 1089 conn = hci_conn_add(hdev, LE_LINK, dst, role); 1090 if (!conn) 1091 return ERR_PTR(-ENOMEM); 1092 hci_conn_hold(conn); 1093 conn->pending_sec_level = sec_level; 1094 } 1095 1096 conn->dst_type = dst_type; 1097 conn->sec_level = BT_SECURITY_LOW; 1098 conn->conn_timeout = conn_timeout; 1099 1100 hci_req_init(&req, hdev); 1101 1102 /* Disable advertising if we're active. For master role 1103 * connections most controllers will refuse to connect if 1104 * advertising is enabled, and for slave role connections we 1105 * anyway have to disable it in order to start directed 1106 * advertising. Any registered advertisements will be 1107 * re-enabled after the connection attempt is finished. 1108 */ 1109 if (hci_dev_test_flag(hdev, HCI_LE_ADV)) 1110 __hci_req_pause_adv_instances(&req); 1111 1112 /* If requested to connect as slave use directed advertising */ 1113 if (conn->role == HCI_ROLE_SLAVE) { 1114 /* If we're active scanning most controllers are unable 1115 * to initiate advertising. Simply reject the attempt. 1116 */ 1117 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) && 1118 hdev->le_scan_type == LE_SCAN_ACTIVE) { 1119 hci_req_purge(&req); 1120 hci_conn_del(conn); 1121 return ERR_PTR(-EBUSY); 1122 } 1123 1124 hci_req_directed_advertising(&req, conn); 1125 goto create_conn; 1126 } 1127 1128 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type); 1129 if (params) { 1130 conn->le_conn_min_interval = params->conn_min_interval; 1131 conn->le_conn_max_interval = params->conn_max_interval; 1132 conn->le_conn_latency = params->conn_latency; 1133 conn->le_supv_timeout = params->supervision_timeout; 1134 } else { 1135 conn->le_conn_min_interval = hdev->le_conn_min_interval; 1136 conn->le_conn_max_interval = hdev->le_conn_max_interval; 1137 conn->le_conn_latency = hdev->le_conn_latency; 1138 conn->le_supv_timeout = hdev->le_supv_timeout; 1139 } 1140 1141 /* If controller is scanning, we stop it since some controllers are 1142 * not able to scan and connect at the same time. Also set the 1143 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete 1144 * handler for scan disabling knows to set the correct discovery 1145 * state. 1146 */ 1147 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) { 1148 hci_req_add_le_scan_disable(&req, rpa_le_conn); 1149 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED); 1150 } 1151 1152 hci_req_add_le_create_conn(&req, conn, direct_rpa); 1153 1154 create_conn: 1155 err = hci_req_run(&req, create_le_conn_complete); 1156 if (err) { 1157 hci_conn_del(conn); 1158 1159 if (hdev->adv_instance_cnt) 1160 hci_req_resume_adv_instances(hdev); 1161 1162 return ERR_PTR(err); 1163 } 1164 1165 return conn; 1166 } 1167 1168 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type) 1169 { 1170 struct hci_conn *conn; 1171 1172 conn = hci_conn_hash_lookup_le(hdev, addr, type); 1173 if (!conn) 1174 return false; 1175 1176 if (conn->state != BT_CONNECTED) 1177 return false; 1178 1179 return true; 1180 } 1181 1182 /* This function requires the caller holds hdev->lock */ 1183 static int hci_explicit_conn_params_set(struct hci_dev *hdev, 1184 bdaddr_t *addr, u8 addr_type) 1185 { 1186 struct hci_conn_params *params; 1187 1188 if (is_connected(hdev, addr, addr_type)) 1189 return -EISCONN; 1190 1191 params = hci_conn_params_lookup(hdev, addr, addr_type); 1192 if (!params) { 1193 params = hci_conn_params_add(hdev, addr, addr_type); 1194 if (!params) 1195 return -ENOMEM; 1196 1197 /* If we created new params, mark them to be deleted in 1198 * hci_connect_le_scan_cleanup. It's different case than 1199 * existing disabled params, those will stay after cleanup. 1200 */ 1201 params->auto_connect = HCI_AUTO_CONN_EXPLICIT; 1202 } 1203 1204 /* We're trying to connect, so make sure params are at pend_le_conns */ 1205 if (params->auto_connect == HCI_AUTO_CONN_DISABLED || 1206 params->auto_connect == HCI_AUTO_CONN_REPORT || 1207 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) { 1208 list_del_init(¶ms->action); 1209 list_add(¶ms->action, &hdev->pend_le_conns); 1210 } 1211 1212 params->explicit_connect = true; 1213 1214 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type, 1215 params->auto_connect); 1216 1217 return 0; 1218 } 1219 1220 /* This function requires the caller holds hdev->lock */ 1221 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst, 1222 u8 dst_type, u8 sec_level, 1223 u16 conn_timeout, 1224 enum conn_reasons conn_reason) 1225 { 1226 struct hci_conn *conn; 1227 1228 /* Let's make sure that le is enabled.*/ 1229 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 1230 if (lmp_le_capable(hdev)) 1231 return ERR_PTR(-ECONNREFUSED); 1232 1233 return ERR_PTR(-EOPNOTSUPP); 1234 } 1235 1236 /* Some devices send ATT messages as soon as the physical link is 1237 * established. To be able to handle these ATT messages, the user- 1238 * space first establishes the connection and then starts the pairing 1239 * process. 1240 * 1241 * So if a hci_conn object already exists for the following connection 1242 * attempt, we simply update pending_sec_level and auth_type fields 1243 * and return the object found. 1244 */ 1245 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type); 1246 if (conn) { 1247 if (conn->pending_sec_level < sec_level) 1248 conn->pending_sec_level = sec_level; 1249 goto done; 1250 } 1251 1252 BT_DBG("requesting refresh of dst_addr"); 1253 1254 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER); 1255 if (!conn) 1256 return ERR_PTR(-ENOMEM); 1257 1258 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) { 1259 hci_conn_del(conn); 1260 return ERR_PTR(-EBUSY); 1261 } 1262 1263 conn->state = BT_CONNECT; 1264 set_bit(HCI_CONN_SCANNING, &conn->flags); 1265 conn->dst_type = dst_type; 1266 conn->sec_level = BT_SECURITY_LOW; 1267 conn->pending_sec_level = sec_level; 1268 conn->conn_timeout = conn_timeout; 1269 conn->conn_reason = conn_reason; 1270 1271 hci_update_background_scan(hdev); 1272 1273 done: 1274 hci_conn_hold(conn); 1275 return conn; 1276 } 1277 1278 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst, 1279 u8 sec_level, u8 auth_type, 1280 enum conn_reasons conn_reason) 1281 { 1282 struct hci_conn *acl; 1283 1284 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) { 1285 if (lmp_bredr_capable(hdev)) 1286 return ERR_PTR(-ECONNREFUSED); 1287 1288 return ERR_PTR(-EOPNOTSUPP); 1289 } 1290 1291 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst); 1292 if (!acl) { 1293 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER); 1294 if (!acl) 1295 return ERR_PTR(-ENOMEM); 1296 } 1297 1298 hci_conn_hold(acl); 1299 1300 acl->conn_reason = conn_reason; 1301 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) { 1302 acl->sec_level = BT_SECURITY_LOW; 1303 acl->pending_sec_level = sec_level; 1304 acl->auth_type = auth_type; 1305 hci_acl_create_connection(acl); 1306 } 1307 1308 return acl; 1309 } 1310 1311 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst, 1312 __u16 setting) 1313 { 1314 struct hci_conn *acl; 1315 struct hci_conn *sco; 1316 1317 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING, 1318 CONN_REASON_SCO_CONNECT); 1319 if (IS_ERR(acl)) 1320 return acl; 1321 1322 sco = hci_conn_hash_lookup_ba(hdev, type, dst); 1323 if (!sco) { 1324 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER); 1325 if (!sco) { 1326 hci_conn_drop(acl); 1327 return ERR_PTR(-ENOMEM); 1328 } 1329 } 1330 1331 acl->link = sco; 1332 sco->link = acl; 1333 1334 hci_conn_hold(sco); 1335 1336 sco->setting = setting; 1337 1338 if (acl->state == BT_CONNECTED && 1339 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) { 1340 set_bit(HCI_CONN_POWER_SAVE, &acl->flags); 1341 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON); 1342 1343 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) { 1344 /* defer SCO setup until mode change completed */ 1345 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags); 1346 return sco; 1347 } 1348 1349 hci_sco_setup(acl, 0x00); 1350 } 1351 1352 return sco; 1353 } 1354 1355 /* Check link security requirement */ 1356 int hci_conn_check_link_mode(struct hci_conn *conn) 1357 { 1358 BT_DBG("hcon %p", conn); 1359 1360 /* In Secure Connections Only mode, it is required that Secure 1361 * Connections is used and the link is encrypted with AES-CCM 1362 * using a P-256 authenticated combination key. 1363 */ 1364 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) { 1365 if (!hci_conn_sc_enabled(conn) || 1366 !test_bit(HCI_CONN_AES_CCM, &conn->flags) || 1367 conn->key_type != HCI_LK_AUTH_COMBINATION_P256) 1368 return 0; 1369 } 1370 1371 /* AES encryption is required for Level 4: 1372 * 1373 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C 1374 * page 1319: 1375 * 1376 * 128-bit equivalent strength for link and encryption keys 1377 * required using FIPS approved algorithms (E0 not allowed, 1378 * SAFER+ not allowed, and P-192 not allowed; encryption key 1379 * not shortened) 1380 */ 1381 if (conn->sec_level == BT_SECURITY_FIPS && 1382 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) { 1383 bt_dev_err(conn->hdev, 1384 "Invalid security: Missing AES-CCM usage"); 1385 return 0; 1386 } 1387 1388 if (hci_conn_ssp_enabled(conn) && 1389 !test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 1390 return 0; 1391 1392 return 1; 1393 } 1394 1395 /* Authenticate remote device */ 1396 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type) 1397 { 1398 BT_DBG("hcon %p", conn); 1399 1400 if (conn->pending_sec_level > sec_level) 1401 sec_level = conn->pending_sec_level; 1402 1403 if (sec_level > conn->sec_level) 1404 conn->pending_sec_level = sec_level; 1405 else if (test_bit(HCI_CONN_AUTH, &conn->flags)) 1406 return 1; 1407 1408 /* Make sure we preserve an existing MITM requirement*/ 1409 auth_type |= (conn->auth_type & 0x01); 1410 1411 conn->auth_type = auth_type; 1412 1413 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) { 1414 struct hci_cp_auth_requested cp; 1415 1416 cp.handle = cpu_to_le16(conn->handle); 1417 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED, 1418 sizeof(cp), &cp); 1419 1420 /* If we're already encrypted set the REAUTH_PEND flag, 1421 * otherwise set the ENCRYPT_PEND. 1422 */ 1423 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 1424 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags); 1425 else 1426 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags); 1427 } 1428 1429 return 0; 1430 } 1431 1432 /* Encrypt the link */ 1433 static void hci_conn_encrypt(struct hci_conn *conn) 1434 { 1435 BT_DBG("hcon %p", conn); 1436 1437 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) { 1438 struct hci_cp_set_conn_encrypt cp; 1439 cp.handle = cpu_to_le16(conn->handle); 1440 cp.encrypt = 0x01; 1441 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp), 1442 &cp); 1443 } 1444 } 1445 1446 /* Enable security */ 1447 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type, 1448 bool initiator) 1449 { 1450 BT_DBG("hcon %p", conn); 1451 1452 if (conn->type == LE_LINK) 1453 return smp_conn_security(conn, sec_level); 1454 1455 /* For sdp we don't need the link key. */ 1456 if (sec_level == BT_SECURITY_SDP) 1457 return 1; 1458 1459 /* For non 2.1 devices and low security level we don't need the link 1460 key. */ 1461 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn)) 1462 return 1; 1463 1464 /* For other security levels we need the link key. */ 1465 if (!test_bit(HCI_CONN_AUTH, &conn->flags)) 1466 goto auth; 1467 1468 /* An authenticated FIPS approved combination key has sufficient 1469 * security for security level 4. */ 1470 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 && 1471 sec_level == BT_SECURITY_FIPS) 1472 goto encrypt; 1473 1474 /* An authenticated combination key has sufficient security for 1475 security level 3. */ 1476 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 || 1477 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) && 1478 sec_level == BT_SECURITY_HIGH) 1479 goto encrypt; 1480 1481 /* An unauthenticated combination key has sufficient security for 1482 security level 1 and 2. */ 1483 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 || 1484 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) && 1485 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW)) 1486 goto encrypt; 1487 1488 /* A combination key has always sufficient security for the security 1489 levels 1 or 2. High security level requires the combination key 1490 is generated using maximum PIN code length (16). 1491 For pre 2.1 units. */ 1492 if (conn->key_type == HCI_LK_COMBINATION && 1493 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW || 1494 conn->pin_length == 16)) 1495 goto encrypt; 1496 1497 auth: 1498 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) 1499 return 0; 1500 1501 if (initiator) 1502 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags); 1503 1504 if (!hci_conn_auth(conn, sec_level, auth_type)) 1505 return 0; 1506 1507 encrypt: 1508 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) { 1509 /* Ensure that the encryption key size has been read, 1510 * otherwise stall the upper layer responses. 1511 */ 1512 if (!conn->enc_key_size) 1513 return 0; 1514 1515 /* Nothing else needed, all requirements are met */ 1516 return 1; 1517 } 1518 1519 hci_conn_encrypt(conn); 1520 return 0; 1521 } 1522 EXPORT_SYMBOL(hci_conn_security); 1523 1524 /* Check secure link requirement */ 1525 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level) 1526 { 1527 BT_DBG("hcon %p", conn); 1528 1529 /* Accept if non-secure or higher security level is required */ 1530 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS) 1531 return 1; 1532 1533 /* Accept if secure or higher security level is already present */ 1534 if (conn->sec_level == BT_SECURITY_HIGH || 1535 conn->sec_level == BT_SECURITY_FIPS) 1536 return 1; 1537 1538 /* Reject not secure link */ 1539 return 0; 1540 } 1541 EXPORT_SYMBOL(hci_conn_check_secure); 1542 1543 /* Switch role */ 1544 int hci_conn_switch_role(struct hci_conn *conn, __u8 role) 1545 { 1546 BT_DBG("hcon %p", conn); 1547 1548 if (role == conn->role) 1549 return 1; 1550 1551 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) { 1552 struct hci_cp_switch_role cp; 1553 bacpy(&cp.bdaddr, &conn->dst); 1554 cp.role = role; 1555 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp); 1556 } 1557 1558 return 0; 1559 } 1560 EXPORT_SYMBOL(hci_conn_switch_role); 1561 1562 /* Enter active mode */ 1563 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active) 1564 { 1565 struct hci_dev *hdev = conn->hdev; 1566 1567 BT_DBG("hcon %p mode %d", conn, conn->mode); 1568 1569 if (conn->mode != HCI_CM_SNIFF) 1570 goto timer; 1571 1572 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active) 1573 goto timer; 1574 1575 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { 1576 struct hci_cp_exit_sniff_mode cp; 1577 cp.handle = cpu_to_le16(conn->handle); 1578 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp); 1579 } 1580 1581 timer: 1582 if (hdev->idle_timeout > 0) 1583 queue_delayed_work(hdev->workqueue, &conn->idle_work, 1584 msecs_to_jiffies(hdev->idle_timeout)); 1585 } 1586 1587 /* Drop all connection on the device */ 1588 void hci_conn_hash_flush(struct hci_dev *hdev) 1589 { 1590 struct hci_conn_hash *h = &hdev->conn_hash; 1591 struct hci_conn *c, *n; 1592 1593 BT_DBG("hdev %s", hdev->name); 1594 1595 list_for_each_entry_safe(c, n, &h->list, list) { 1596 c->state = BT_CLOSED; 1597 1598 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM); 1599 hci_conn_del(c); 1600 } 1601 } 1602 1603 /* Check pending connect attempts */ 1604 void hci_conn_check_pending(struct hci_dev *hdev) 1605 { 1606 struct hci_conn *conn; 1607 1608 BT_DBG("hdev %s", hdev->name); 1609 1610 hci_dev_lock(hdev); 1611 1612 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2); 1613 if (conn) 1614 hci_acl_create_connection(conn); 1615 1616 hci_dev_unlock(hdev); 1617 } 1618 1619 static u32 get_link_mode(struct hci_conn *conn) 1620 { 1621 u32 link_mode = 0; 1622 1623 if (conn->role == HCI_ROLE_MASTER) 1624 link_mode |= HCI_LM_MASTER; 1625 1626 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 1627 link_mode |= HCI_LM_ENCRYPT; 1628 1629 if (test_bit(HCI_CONN_AUTH, &conn->flags)) 1630 link_mode |= HCI_LM_AUTH; 1631 1632 if (test_bit(HCI_CONN_SECURE, &conn->flags)) 1633 link_mode |= HCI_LM_SECURE; 1634 1635 if (test_bit(HCI_CONN_FIPS, &conn->flags)) 1636 link_mode |= HCI_LM_FIPS; 1637 1638 return link_mode; 1639 } 1640 1641 int hci_get_conn_list(void __user *arg) 1642 { 1643 struct hci_conn *c; 1644 struct hci_conn_list_req req, *cl; 1645 struct hci_conn_info *ci; 1646 struct hci_dev *hdev; 1647 int n = 0, size, err; 1648 1649 if (copy_from_user(&req, arg, sizeof(req))) 1650 return -EFAULT; 1651 1652 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci)) 1653 return -EINVAL; 1654 1655 size = sizeof(req) + req.conn_num * sizeof(*ci); 1656 1657 cl = kmalloc(size, GFP_KERNEL); 1658 if (!cl) 1659 return -ENOMEM; 1660 1661 hdev = hci_dev_get(req.dev_id); 1662 if (!hdev) { 1663 kfree(cl); 1664 return -ENODEV; 1665 } 1666 1667 ci = cl->conn_info; 1668 1669 hci_dev_lock(hdev); 1670 list_for_each_entry(c, &hdev->conn_hash.list, list) { 1671 bacpy(&(ci + n)->bdaddr, &c->dst); 1672 (ci + n)->handle = c->handle; 1673 (ci + n)->type = c->type; 1674 (ci + n)->out = c->out; 1675 (ci + n)->state = c->state; 1676 (ci + n)->link_mode = get_link_mode(c); 1677 if (++n >= req.conn_num) 1678 break; 1679 } 1680 hci_dev_unlock(hdev); 1681 1682 cl->dev_id = hdev->id; 1683 cl->conn_num = n; 1684 size = sizeof(req) + n * sizeof(*ci); 1685 1686 hci_dev_put(hdev); 1687 1688 err = copy_to_user(arg, cl, size); 1689 kfree(cl); 1690 1691 return err ? -EFAULT : 0; 1692 } 1693 1694 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg) 1695 { 1696 struct hci_conn_info_req req; 1697 struct hci_conn_info ci; 1698 struct hci_conn *conn; 1699 char __user *ptr = arg + sizeof(req); 1700 1701 if (copy_from_user(&req, arg, sizeof(req))) 1702 return -EFAULT; 1703 1704 hci_dev_lock(hdev); 1705 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr); 1706 if (conn) { 1707 bacpy(&ci.bdaddr, &conn->dst); 1708 ci.handle = conn->handle; 1709 ci.type = conn->type; 1710 ci.out = conn->out; 1711 ci.state = conn->state; 1712 ci.link_mode = get_link_mode(conn); 1713 } 1714 hci_dev_unlock(hdev); 1715 1716 if (!conn) 1717 return -ENOENT; 1718 1719 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0; 1720 } 1721 1722 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg) 1723 { 1724 struct hci_auth_info_req req; 1725 struct hci_conn *conn; 1726 1727 if (copy_from_user(&req, arg, sizeof(req))) 1728 return -EFAULT; 1729 1730 hci_dev_lock(hdev); 1731 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr); 1732 if (conn) 1733 req.type = conn->auth_type; 1734 hci_dev_unlock(hdev); 1735 1736 if (!conn) 1737 return -ENOENT; 1738 1739 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0; 1740 } 1741 1742 struct hci_chan *hci_chan_create(struct hci_conn *conn) 1743 { 1744 struct hci_dev *hdev = conn->hdev; 1745 struct hci_chan *chan; 1746 1747 BT_DBG("%s hcon %p", hdev->name, conn); 1748 1749 if (test_bit(HCI_CONN_DROP, &conn->flags)) { 1750 BT_DBG("Refusing to create new hci_chan"); 1751 return NULL; 1752 } 1753 1754 chan = kzalloc(sizeof(*chan), GFP_KERNEL); 1755 if (!chan) 1756 return NULL; 1757 1758 chan->conn = hci_conn_get(conn); 1759 skb_queue_head_init(&chan->data_q); 1760 chan->state = BT_CONNECTED; 1761 1762 list_add_rcu(&chan->list, &conn->chan_list); 1763 1764 return chan; 1765 } 1766 1767 void hci_chan_del(struct hci_chan *chan) 1768 { 1769 struct hci_conn *conn = chan->conn; 1770 struct hci_dev *hdev = conn->hdev; 1771 1772 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan); 1773 1774 list_del_rcu(&chan->list); 1775 1776 synchronize_rcu(); 1777 1778 /* Prevent new hci_chan's to be created for this hci_conn */ 1779 set_bit(HCI_CONN_DROP, &conn->flags); 1780 1781 hci_conn_put(conn); 1782 1783 skb_queue_purge(&chan->data_q); 1784 kfree(chan); 1785 } 1786 1787 void hci_chan_list_flush(struct hci_conn *conn) 1788 { 1789 struct hci_chan *chan, *n; 1790 1791 BT_DBG("hcon %p", conn); 1792 1793 list_for_each_entry_safe(chan, n, &conn->chan_list, list) 1794 hci_chan_del(chan); 1795 } 1796 1797 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon, 1798 __u16 handle) 1799 { 1800 struct hci_chan *hchan; 1801 1802 list_for_each_entry(hchan, &hcon->chan_list, list) { 1803 if (hchan->handle == handle) 1804 return hchan; 1805 } 1806 1807 return NULL; 1808 } 1809 1810 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle) 1811 { 1812 struct hci_conn_hash *h = &hdev->conn_hash; 1813 struct hci_conn *hcon; 1814 struct hci_chan *hchan = NULL; 1815 1816 rcu_read_lock(); 1817 1818 list_for_each_entry_rcu(hcon, &h->list, list) { 1819 hchan = __hci_chan_lookup_handle(hcon, handle); 1820 if (hchan) 1821 break; 1822 } 1823 1824 rcu_read_unlock(); 1825 1826 return hchan; 1827 } 1828 1829 u32 hci_conn_get_phy(struct hci_conn *conn) 1830 { 1831 u32 phys = 0; 1832 1833 hci_dev_lock(conn->hdev); 1834 1835 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471: 1836 * Table 6.2: Packets defined for synchronous, asynchronous, and 1837 * CSB logical transport types. 1838 */ 1839 switch (conn->type) { 1840 case SCO_LINK: 1841 /* SCO logical transport (1 Mb/s): 1842 * HV1, HV2, HV3 and DV. 1843 */ 1844 phys |= BT_PHY_BR_1M_1SLOT; 1845 1846 break; 1847 1848 case ACL_LINK: 1849 /* ACL logical transport (1 Mb/s) ptt=0: 1850 * DH1, DM3, DH3, DM5 and DH5. 1851 */ 1852 phys |= BT_PHY_BR_1M_1SLOT; 1853 1854 if (conn->pkt_type & (HCI_DM3 | HCI_DH3)) 1855 phys |= BT_PHY_BR_1M_3SLOT; 1856 1857 if (conn->pkt_type & (HCI_DM5 | HCI_DH5)) 1858 phys |= BT_PHY_BR_1M_5SLOT; 1859 1860 /* ACL logical transport (2 Mb/s) ptt=1: 1861 * 2-DH1, 2-DH3 and 2-DH5. 1862 */ 1863 if (!(conn->pkt_type & HCI_2DH1)) 1864 phys |= BT_PHY_EDR_2M_1SLOT; 1865 1866 if (!(conn->pkt_type & HCI_2DH3)) 1867 phys |= BT_PHY_EDR_2M_3SLOT; 1868 1869 if (!(conn->pkt_type & HCI_2DH5)) 1870 phys |= BT_PHY_EDR_2M_5SLOT; 1871 1872 /* ACL logical transport (3 Mb/s) ptt=1: 1873 * 3-DH1, 3-DH3 and 3-DH5. 1874 */ 1875 if (!(conn->pkt_type & HCI_3DH1)) 1876 phys |= BT_PHY_EDR_3M_1SLOT; 1877 1878 if (!(conn->pkt_type & HCI_3DH3)) 1879 phys |= BT_PHY_EDR_3M_3SLOT; 1880 1881 if (!(conn->pkt_type & HCI_3DH5)) 1882 phys |= BT_PHY_EDR_3M_5SLOT; 1883 1884 break; 1885 1886 case ESCO_LINK: 1887 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */ 1888 phys |= BT_PHY_BR_1M_1SLOT; 1889 1890 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5))) 1891 phys |= BT_PHY_BR_1M_3SLOT; 1892 1893 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */ 1894 if (!(conn->pkt_type & ESCO_2EV3)) 1895 phys |= BT_PHY_EDR_2M_1SLOT; 1896 1897 if (!(conn->pkt_type & ESCO_2EV5)) 1898 phys |= BT_PHY_EDR_2M_3SLOT; 1899 1900 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */ 1901 if (!(conn->pkt_type & ESCO_3EV3)) 1902 phys |= BT_PHY_EDR_3M_1SLOT; 1903 1904 if (!(conn->pkt_type & ESCO_3EV5)) 1905 phys |= BT_PHY_EDR_3M_3SLOT; 1906 1907 break; 1908 1909 case LE_LINK: 1910 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M) 1911 phys |= BT_PHY_LE_1M_TX; 1912 1913 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M) 1914 phys |= BT_PHY_LE_1M_RX; 1915 1916 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M) 1917 phys |= BT_PHY_LE_2M_TX; 1918 1919 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M) 1920 phys |= BT_PHY_LE_2M_RX; 1921 1922 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED) 1923 phys |= BT_PHY_LE_CODED_TX; 1924 1925 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED) 1926 phys |= BT_PHY_LE_CODED_RX; 1927 1928 break; 1929 } 1930 1931 hci_dev_unlock(conn->hdev); 1932 1933 return phys; 1934 } 1935