1 /* 2 BlueZ - Bluetooth protocol stack for Linux 3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved. 4 Copyright 2023 NXP 5 6 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License version 2 as 10 published by the Free Software Foundation; 11 12 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 13 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 14 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 15 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 16 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 17 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 18 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 19 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 20 21 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 22 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 23 SOFTWARE IS DISCLAIMED. 24 */ 25 26 /* Bluetooth HCI connection handling. */ 27 28 #include <linux/export.h> 29 #include <linux/debugfs.h> 30 31 #include <net/bluetooth/bluetooth.h> 32 #include <net/bluetooth/hci_core.h> 33 #include <net/bluetooth/l2cap.h> 34 #include <net/bluetooth/iso.h> 35 #include <net/bluetooth/mgmt.h> 36 37 #include "hci_request.h" 38 #include "smp.h" 39 #include "a2mp.h" 40 #include "eir.h" 41 42 struct sco_param { 43 u16 pkt_type; 44 u16 max_latency; 45 u8 retrans_effort; 46 }; 47 48 struct conn_handle_t { 49 struct hci_conn *conn; 50 __u16 handle; 51 }; 52 53 static const struct sco_param esco_param_cvsd[] = { 54 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */ 55 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */ 56 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */ 57 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */ 58 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */ 59 }; 60 61 static const struct sco_param sco_param_cvsd[] = { 62 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */ 63 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */ 64 }; 65 66 static const struct sco_param esco_param_msbc[] = { 67 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */ 68 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */ 69 }; 70 71 /* This function requires the caller holds hdev->lock */ 72 static void hci_connect_le_scan_cleanup(struct hci_conn *conn, u8 status) 73 { 74 struct hci_conn_params *params; 75 struct hci_dev *hdev = conn->hdev; 76 struct smp_irk *irk; 77 bdaddr_t *bdaddr; 78 u8 bdaddr_type; 79 80 bdaddr = &conn->dst; 81 bdaddr_type = conn->dst_type; 82 83 /* Check if we need to convert to identity address */ 84 irk = hci_get_irk(hdev, bdaddr, bdaddr_type); 85 if (irk) { 86 bdaddr = &irk->bdaddr; 87 bdaddr_type = irk->addr_type; 88 } 89 90 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr, 91 bdaddr_type); 92 if (!params) 93 return; 94 95 if (params->conn) { 96 hci_conn_drop(params->conn); 97 hci_conn_put(params->conn); 98 params->conn = NULL; 99 } 100 101 if (!params->explicit_connect) 102 return; 103 104 /* If the status indicates successful cancellation of 105 * the attempt (i.e. Unknown Connection Id) there's no point of 106 * notifying failure since we'll go back to keep trying to 107 * connect. The only exception is explicit connect requests 108 * where a timeout + cancel does indicate an actual failure. 109 */ 110 if (status && status != HCI_ERROR_UNKNOWN_CONN_ID) 111 mgmt_connect_failed(hdev, &conn->dst, conn->type, 112 conn->dst_type, status); 113 114 /* The connection attempt was doing scan for new RPA, and is 115 * in scan phase. If params are not associated with any other 116 * autoconnect action, remove them completely. If they are, just unmark 117 * them as waiting for connection, by clearing explicit_connect field. 118 */ 119 params->explicit_connect = false; 120 121 hci_pend_le_list_del_init(params); 122 123 switch (params->auto_connect) { 124 case HCI_AUTO_CONN_EXPLICIT: 125 hci_conn_params_del(hdev, bdaddr, bdaddr_type); 126 /* return instead of break to avoid duplicate scan update */ 127 return; 128 case HCI_AUTO_CONN_DIRECT: 129 case HCI_AUTO_CONN_ALWAYS: 130 hci_pend_le_list_add(params, &hdev->pend_le_conns); 131 break; 132 case HCI_AUTO_CONN_REPORT: 133 hci_pend_le_list_add(params, &hdev->pend_le_reports); 134 break; 135 default: 136 break; 137 } 138 139 hci_update_passive_scan(hdev); 140 } 141 142 static void hci_conn_cleanup(struct hci_conn *conn) 143 { 144 struct hci_dev *hdev = conn->hdev; 145 146 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags)) 147 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type); 148 149 if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags)) 150 hci_remove_link_key(hdev, &conn->dst); 151 152 hci_chan_list_flush(conn); 153 154 hci_conn_hash_del(hdev, conn); 155 156 if (HCI_CONN_HANDLE_UNSET(conn->handle)) 157 ida_free(&hdev->unset_handle_ida, conn->handle); 158 159 if (conn->cleanup) 160 conn->cleanup(conn); 161 162 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) { 163 switch (conn->setting & SCO_AIRMODE_MASK) { 164 case SCO_AIRMODE_CVSD: 165 case SCO_AIRMODE_TRANSP: 166 if (hdev->notify) 167 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO); 168 break; 169 } 170 } else { 171 if (hdev->notify) 172 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL); 173 } 174 175 debugfs_remove_recursive(conn->debugfs); 176 177 hci_conn_del_sysfs(conn); 178 179 hci_dev_put(hdev); 180 } 181 182 static void hci_acl_create_connection(struct hci_conn *conn) 183 { 184 struct hci_dev *hdev = conn->hdev; 185 struct inquiry_entry *ie; 186 struct hci_cp_create_conn cp; 187 188 BT_DBG("hcon %p", conn); 189 190 /* Many controllers disallow HCI Create Connection while it is doing 191 * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create 192 * Connection. This may cause the MGMT discovering state to become false 193 * without user space's request but it is okay since the MGMT Discovery 194 * APIs do not promise that discovery should be done forever. Instead, 195 * the user space monitors the status of MGMT discovering and it may 196 * request for discovery again when this flag becomes false. 197 */ 198 if (test_bit(HCI_INQUIRY, &hdev->flags)) { 199 /* Put this connection to "pending" state so that it will be 200 * executed after the inquiry cancel command complete event. 201 */ 202 conn->state = BT_CONNECT2; 203 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL); 204 return; 205 } 206 207 conn->state = BT_CONNECT; 208 conn->out = true; 209 conn->role = HCI_ROLE_MASTER; 210 211 conn->attempt++; 212 213 conn->link_policy = hdev->link_policy; 214 215 memset(&cp, 0, sizeof(cp)); 216 bacpy(&cp.bdaddr, &conn->dst); 217 cp.pscan_rep_mode = 0x02; 218 219 ie = hci_inquiry_cache_lookup(hdev, &conn->dst); 220 if (ie) { 221 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) { 222 cp.pscan_rep_mode = ie->data.pscan_rep_mode; 223 cp.pscan_mode = ie->data.pscan_mode; 224 cp.clock_offset = ie->data.clock_offset | 225 cpu_to_le16(0x8000); 226 } 227 228 memcpy(conn->dev_class, ie->data.dev_class, 3); 229 } 230 231 cp.pkt_type = cpu_to_le16(conn->pkt_type); 232 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER)) 233 cp.role_switch = 0x01; 234 else 235 cp.role_switch = 0x00; 236 237 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp); 238 } 239 240 int hci_disconnect(struct hci_conn *conn, __u8 reason) 241 { 242 BT_DBG("hcon %p", conn); 243 244 /* When we are central of an established connection and it enters 245 * the disconnect timeout, then go ahead and try to read the 246 * current clock offset. Processing of the result is done 247 * within the event handling and hci_clock_offset_evt function. 248 */ 249 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER && 250 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) { 251 struct hci_dev *hdev = conn->hdev; 252 struct hci_cp_read_clock_offset clkoff_cp; 253 254 clkoff_cp.handle = cpu_to_le16(conn->handle); 255 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp), 256 &clkoff_cp); 257 } 258 259 return hci_abort_conn(conn, reason); 260 } 261 262 static void hci_add_sco(struct hci_conn *conn, __u16 handle) 263 { 264 struct hci_dev *hdev = conn->hdev; 265 struct hci_cp_add_sco cp; 266 267 BT_DBG("hcon %p", conn); 268 269 conn->state = BT_CONNECT; 270 conn->out = true; 271 272 conn->attempt++; 273 274 cp.handle = cpu_to_le16(handle); 275 cp.pkt_type = cpu_to_le16(conn->pkt_type); 276 277 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp); 278 } 279 280 static bool find_next_esco_param(struct hci_conn *conn, 281 const struct sco_param *esco_param, int size) 282 { 283 if (!conn->parent) 284 return false; 285 286 for (; conn->attempt <= size; conn->attempt++) { 287 if (lmp_esco_2m_capable(conn->parent) || 288 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3)) 289 break; 290 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported", 291 conn, conn->attempt); 292 } 293 294 return conn->attempt <= size; 295 } 296 297 static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec) 298 { 299 int err; 300 __u8 vnd_len, *vnd_data = NULL; 301 struct hci_op_configure_data_path *cmd = NULL; 302 303 err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len, 304 &vnd_data); 305 if (err < 0) 306 goto error; 307 308 cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL); 309 if (!cmd) { 310 err = -ENOMEM; 311 goto error; 312 } 313 314 err = hdev->get_data_path_id(hdev, &cmd->data_path_id); 315 if (err < 0) 316 goto error; 317 318 cmd->vnd_len = vnd_len; 319 memcpy(cmd->vnd_data, vnd_data, vnd_len); 320 321 cmd->direction = 0x00; 322 __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH, 323 sizeof(*cmd) + vnd_len, cmd, HCI_CMD_TIMEOUT); 324 325 cmd->direction = 0x01; 326 err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH, 327 sizeof(*cmd) + vnd_len, cmd, 328 HCI_CMD_TIMEOUT); 329 error: 330 331 kfree(cmd); 332 kfree(vnd_data); 333 return err; 334 } 335 336 static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data) 337 { 338 struct conn_handle_t *conn_handle = data; 339 struct hci_conn *conn = conn_handle->conn; 340 __u16 handle = conn_handle->handle; 341 struct hci_cp_enhanced_setup_sync_conn cp; 342 const struct sco_param *param; 343 344 kfree(conn_handle); 345 346 bt_dev_dbg(hdev, "hcon %p", conn); 347 348 /* for offload use case, codec needs to configured before opening SCO */ 349 if (conn->codec.data_path) 350 configure_datapath_sync(hdev, &conn->codec); 351 352 conn->state = BT_CONNECT; 353 conn->out = true; 354 355 conn->attempt++; 356 357 memset(&cp, 0x00, sizeof(cp)); 358 359 cp.handle = cpu_to_le16(handle); 360 361 cp.tx_bandwidth = cpu_to_le32(0x00001f40); 362 cp.rx_bandwidth = cpu_to_le32(0x00001f40); 363 364 switch (conn->codec.id) { 365 case BT_CODEC_MSBC: 366 if (!find_next_esco_param(conn, esco_param_msbc, 367 ARRAY_SIZE(esco_param_msbc))) 368 return -EINVAL; 369 370 param = &esco_param_msbc[conn->attempt - 1]; 371 cp.tx_coding_format.id = 0x05; 372 cp.rx_coding_format.id = 0x05; 373 cp.tx_codec_frame_size = __cpu_to_le16(60); 374 cp.rx_codec_frame_size = __cpu_to_le16(60); 375 cp.in_bandwidth = __cpu_to_le32(32000); 376 cp.out_bandwidth = __cpu_to_le32(32000); 377 cp.in_coding_format.id = 0x04; 378 cp.out_coding_format.id = 0x04; 379 cp.in_coded_data_size = __cpu_to_le16(16); 380 cp.out_coded_data_size = __cpu_to_le16(16); 381 cp.in_pcm_data_format = 2; 382 cp.out_pcm_data_format = 2; 383 cp.in_pcm_sample_payload_msb_pos = 0; 384 cp.out_pcm_sample_payload_msb_pos = 0; 385 cp.in_data_path = conn->codec.data_path; 386 cp.out_data_path = conn->codec.data_path; 387 cp.in_transport_unit_size = 1; 388 cp.out_transport_unit_size = 1; 389 break; 390 391 case BT_CODEC_TRANSPARENT: 392 if (!find_next_esco_param(conn, esco_param_msbc, 393 ARRAY_SIZE(esco_param_msbc))) 394 return false; 395 param = &esco_param_msbc[conn->attempt - 1]; 396 cp.tx_coding_format.id = 0x03; 397 cp.rx_coding_format.id = 0x03; 398 cp.tx_codec_frame_size = __cpu_to_le16(60); 399 cp.rx_codec_frame_size = __cpu_to_le16(60); 400 cp.in_bandwidth = __cpu_to_le32(0x1f40); 401 cp.out_bandwidth = __cpu_to_le32(0x1f40); 402 cp.in_coding_format.id = 0x03; 403 cp.out_coding_format.id = 0x03; 404 cp.in_coded_data_size = __cpu_to_le16(16); 405 cp.out_coded_data_size = __cpu_to_le16(16); 406 cp.in_pcm_data_format = 2; 407 cp.out_pcm_data_format = 2; 408 cp.in_pcm_sample_payload_msb_pos = 0; 409 cp.out_pcm_sample_payload_msb_pos = 0; 410 cp.in_data_path = conn->codec.data_path; 411 cp.out_data_path = conn->codec.data_path; 412 cp.in_transport_unit_size = 1; 413 cp.out_transport_unit_size = 1; 414 break; 415 416 case BT_CODEC_CVSD: 417 if (conn->parent && lmp_esco_capable(conn->parent)) { 418 if (!find_next_esco_param(conn, esco_param_cvsd, 419 ARRAY_SIZE(esco_param_cvsd))) 420 return -EINVAL; 421 param = &esco_param_cvsd[conn->attempt - 1]; 422 } else { 423 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd)) 424 return -EINVAL; 425 param = &sco_param_cvsd[conn->attempt - 1]; 426 } 427 cp.tx_coding_format.id = 2; 428 cp.rx_coding_format.id = 2; 429 cp.tx_codec_frame_size = __cpu_to_le16(60); 430 cp.rx_codec_frame_size = __cpu_to_le16(60); 431 cp.in_bandwidth = __cpu_to_le32(16000); 432 cp.out_bandwidth = __cpu_to_le32(16000); 433 cp.in_coding_format.id = 4; 434 cp.out_coding_format.id = 4; 435 cp.in_coded_data_size = __cpu_to_le16(16); 436 cp.out_coded_data_size = __cpu_to_le16(16); 437 cp.in_pcm_data_format = 2; 438 cp.out_pcm_data_format = 2; 439 cp.in_pcm_sample_payload_msb_pos = 0; 440 cp.out_pcm_sample_payload_msb_pos = 0; 441 cp.in_data_path = conn->codec.data_path; 442 cp.out_data_path = conn->codec.data_path; 443 cp.in_transport_unit_size = 16; 444 cp.out_transport_unit_size = 16; 445 break; 446 default: 447 return -EINVAL; 448 } 449 450 cp.retrans_effort = param->retrans_effort; 451 cp.pkt_type = __cpu_to_le16(param->pkt_type); 452 cp.max_latency = __cpu_to_le16(param->max_latency); 453 454 if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0) 455 return -EIO; 456 457 return 0; 458 } 459 460 static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle) 461 { 462 struct hci_dev *hdev = conn->hdev; 463 struct hci_cp_setup_sync_conn cp; 464 const struct sco_param *param; 465 466 bt_dev_dbg(hdev, "hcon %p", conn); 467 468 conn->state = BT_CONNECT; 469 conn->out = true; 470 471 conn->attempt++; 472 473 cp.handle = cpu_to_le16(handle); 474 475 cp.tx_bandwidth = cpu_to_le32(0x00001f40); 476 cp.rx_bandwidth = cpu_to_le32(0x00001f40); 477 cp.voice_setting = cpu_to_le16(conn->setting); 478 479 switch (conn->setting & SCO_AIRMODE_MASK) { 480 case SCO_AIRMODE_TRANSP: 481 if (!find_next_esco_param(conn, esco_param_msbc, 482 ARRAY_SIZE(esco_param_msbc))) 483 return false; 484 param = &esco_param_msbc[conn->attempt - 1]; 485 break; 486 case SCO_AIRMODE_CVSD: 487 if (conn->parent && lmp_esco_capable(conn->parent)) { 488 if (!find_next_esco_param(conn, esco_param_cvsd, 489 ARRAY_SIZE(esco_param_cvsd))) 490 return false; 491 param = &esco_param_cvsd[conn->attempt - 1]; 492 } else { 493 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd)) 494 return false; 495 param = &sco_param_cvsd[conn->attempt - 1]; 496 } 497 break; 498 default: 499 return false; 500 } 501 502 cp.retrans_effort = param->retrans_effort; 503 cp.pkt_type = __cpu_to_le16(param->pkt_type); 504 cp.max_latency = __cpu_to_le16(param->max_latency); 505 506 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0) 507 return false; 508 509 return true; 510 } 511 512 bool hci_setup_sync(struct hci_conn *conn, __u16 handle) 513 { 514 int result; 515 struct conn_handle_t *conn_handle; 516 517 if (enhanced_sync_conn_capable(conn->hdev)) { 518 conn_handle = kzalloc(sizeof(*conn_handle), GFP_KERNEL); 519 520 if (!conn_handle) 521 return false; 522 523 conn_handle->conn = conn; 524 conn_handle->handle = handle; 525 result = hci_cmd_sync_queue(conn->hdev, hci_enhanced_setup_sync, 526 conn_handle, NULL); 527 if (result < 0) 528 kfree(conn_handle); 529 530 return result == 0; 531 } 532 533 return hci_setup_sync_conn(conn, handle); 534 } 535 536 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency, 537 u16 to_multiplier) 538 { 539 struct hci_dev *hdev = conn->hdev; 540 struct hci_conn_params *params; 541 struct hci_cp_le_conn_update cp; 542 543 hci_dev_lock(hdev); 544 545 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type); 546 if (params) { 547 params->conn_min_interval = min; 548 params->conn_max_interval = max; 549 params->conn_latency = latency; 550 params->supervision_timeout = to_multiplier; 551 } 552 553 hci_dev_unlock(hdev); 554 555 memset(&cp, 0, sizeof(cp)); 556 cp.handle = cpu_to_le16(conn->handle); 557 cp.conn_interval_min = cpu_to_le16(min); 558 cp.conn_interval_max = cpu_to_le16(max); 559 cp.conn_latency = cpu_to_le16(latency); 560 cp.supervision_timeout = cpu_to_le16(to_multiplier); 561 cp.min_ce_len = cpu_to_le16(0x0000); 562 cp.max_ce_len = cpu_to_le16(0x0000); 563 564 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp); 565 566 if (params) 567 return 0x01; 568 569 return 0x00; 570 } 571 572 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand, 573 __u8 ltk[16], __u8 key_size) 574 { 575 struct hci_dev *hdev = conn->hdev; 576 struct hci_cp_le_start_enc cp; 577 578 BT_DBG("hcon %p", conn); 579 580 memset(&cp, 0, sizeof(cp)); 581 582 cp.handle = cpu_to_le16(conn->handle); 583 cp.rand = rand; 584 cp.ediv = ediv; 585 memcpy(cp.ltk, ltk, key_size); 586 587 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp); 588 } 589 590 /* Device _must_ be locked */ 591 void hci_sco_setup(struct hci_conn *conn, __u8 status) 592 { 593 struct hci_link *link; 594 595 link = list_first_entry_or_null(&conn->link_list, struct hci_link, list); 596 if (!link || !link->conn) 597 return; 598 599 BT_DBG("hcon %p", conn); 600 601 if (!status) { 602 if (lmp_esco_capable(conn->hdev)) 603 hci_setup_sync(link->conn, conn->handle); 604 else 605 hci_add_sco(link->conn, conn->handle); 606 } else { 607 hci_connect_cfm(link->conn, status); 608 hci_conn_del(link->conn); 609 } 610 } 611 612 static void hci_conn_timeout(struct work_struct *work) 613 { 614 struct hci_conn *conn = container_of(work, struct hci_conn, 615 disc_work.work); 616 int refcnt = atomic_read(&conn->refcnt); 617 618 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state)); 619 620 WARN_ON(refcnt < 0); 621 622 /* FIXME: It was observed that in pairing failed scenario, refcnt 623 * drops below 0. Probably this is because l2cap_conn_del calls 624 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is 625 * dropped. After that loop hci_chan_del is called which also drops 626 * conn. For now make sure that ACL is alive if refcnt is higher then 0, 627 * otherwise drop it. 628 */ 629 if (refcnt > 0) 630 return; 631 632 hci_abort_conn(conn, hci_proto_disconn_ind(conn)); 633 } 634 635 /* Enter sniff mode */ 636 static void hci_conn_idle(struct work_struct *work) 637 { 638 struct hci_conn *conn = container_of(work, struct hci_conn, 639 idle_work.work); 640 struct hci_dev *hdev = conn->hdev; 641 642 BT_DBG("hcon %p mode %d", conn, conn->mode); 643 644 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn)) 645 return; 646 647 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF)) 648 return; 649 650 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) { 651 struct hci_cp_sniff_subrate cp; 652 cp.handle = cpu_to_le16(conn->handle); 653 cp.max_latency = cpu_to_le16(0); 654 cp.min_remote_timeout = cpu_to_le16(0); 655 cp.min_local_timeout = cpu_to_le16(0); 656 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp); 657 } 658 659 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { 660 struct hci_cp_sniff_mode cp; 661 cp.handle = cpu_to_le16(conn->handle); 662 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval); 663 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval); 664 cp.attempt = cpu_to_le16(4); 665 cp.timeout = cpu_to_le16(1); 666 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp); 667 } 668 } 669 670 static void hci_conn_auto_accept(struct work_struct *work) 671 { 672 struct hci_conn *conn = container_of(work, struct hci_conn, 673 auto_accept_work.work); 674 675 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst), 676 &conn->dst); 677 } 678 679 static void le_disable_advertising(struct hci_dev *hdev) 680 { 681 if (ext_adv_capable(hdev)) { 682 struct hci_cp_le_set_ext_adv_enable cp; 683 684 cp.enable = 0x00; 685 cp.num_of_sets = 0x00; 686 687 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp), 688 &cp); 689 } else { 690 u8 enable = 0x00; 691 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), 692 &enable); 693 } 694 } 695 696 static void le_conn_timeout(struct work_struct *work) 697 { 698 struct hci_conn *conn = container_of(work, struct hci_conn, 699 le_conn_timeout.work); 700 struct hci_dev *hdev = conn->hdev; 701 702 BT_DBG(""); 703 704 /* We could end up here due to having done directed advertising, 705 * so clean up the state if necessary. This should however only 706 * happen with broken hardware or if low duty cycle was used 707 * (which doesn't have a timeout of its own). 708 */ 709 if (conn->role == HCI_ROLE_SLAVE) { 710 /* Disable LE Advertising */ 711 le_disable_advertising(hdev); 712 hci_dev_lock(hdev); 713 hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT); 714 hci_dev_unlock(hdev); 715 return; 716 } 717 718 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM); 719 } 720 721 struct iso_cig_params { 722 struct hci_cp_le_set_cig_params cp; 723 struct hci_cis_params cis[0x1f]; 724 }; 725 726 struct iso_list_data { 727 union { 728 u8 cig; 729 u8 big; 730 }; 731 union { 732 u8 cis; 733 u8 bis; 734 u16 sync_handle; 735 }; 736 int count; 737 bool big_term; 738 bool pa_sync_term; 739 bool big_sync_term; 740 }; 741 742 static void bis_list(struct hci_conn *conn, void *data) 743 { 744 struct iso_list_data *d = data; 745 746 /* Skip if not broadcast/ANY address */ 747 if (bacmp(&conn->dst, BDADDR_ANY)) 748 return; 749 750 if (d->big != conn->iso_qos.bcast.big || d->bis == BT_ISO_QOS_BIS_UNSET || 751 d->bis != conn->iso_qos.bcast.bis) 752 return; 753 754 d->count++; 755 } 756 757 static int terminate_big_sync(struct hci_dev *hdev, void *data) 758 { 759 struct iso_list_data *d = data; 760 761 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis); 762 763 hci_remove_ext_adv_instance_sync(hdev, d->bis, NULL); 764 765 /* Only terminate BIG if it has been created */ 766 if (!d->big_term) 767 return 0; 768 769 return hci_le_terminate_big_sync(hdev, d->big, 770 HCI_ERROR_LOCAL_HOST_TERM); 771 } 772 773 static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err) 774 { 775 kfree(data); 776 } 777 778 static int hci_le_terminate_big(struct hci_dev *hdev, struct hci_conn *conn) 779 { 780 struct iso_list_data *d; 781 int ret; 782 783 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", conn->iso_qos.bcast.big, 784 conn->iso_qos.bcast.bis); 785 786 d = kzalloc(sizeof(*d), GFP_KERNEL); 787 if (!d) 788 return -ENOMEM; 789 790 d->big = conn->iso_qos.bcast.big; 791 d->bis = conn->iso_qos.bcast.bis; 792 d->big_term = test_and_clear_bit(HCI_CONN_BIG_CREATED, &conn->flags); 793 794 ret = hci_cmd_sync_queue(hdev, terminate_big_sync, d, 795 terminate_big_destroy); 796 if (ret) 797 kfree(d); 798 799 return ret; 800 } 801 802 static int big_terminate_sync(struct hci_dev *hdev, void *data) 803 { 804 struct iso_list_data *d = data; 805 806 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big, 807 d->sync_handle); 808 809 if (d->big_sync_term) 810 hci_le_big_terminate_sync(hdev, d->big); 811 812 if (d->pa_sync_term) 813 return hci_le_pa_terminate_sync(hdev, d->sync_handle); 814 815 return 0; 816 } 817 818 static int hci_le_big_terminate(struct hci_dev *hdev, u8 big, struct hci_conn *conn) 819 { 820 struct iso_list_data *d; 821 int ret; 822 823 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", big, conn->sync_handle); 824 825 d = kzalloc(sizeof(*d), GFP_KERNEL); 826 if (!d) 827 return -ENOMEM; 828 829 d->big = big; 830 d->sync_handle = conn->sync_handle; 831 d->pa_sync_term = test_and_clear_bit(HCI_CONN_PA_SYNC, &conn->flags); 832 d->big_sync_term = test_and_clear_bit(HCI_CONN_BIG_SYNC, &conn->flags); 833 834 ret = hci_cmd_sync_queue(hdev, big_terminate_sync, d, 835 terminate_big_destroy); 836 if (ret) 837 kfree(d); 838 839 return ret; 840 } 841 842 /* Cleanup BIS connection 843 * 844 * Detects if there any BIS left connected in a BIG 845 * broadcaster: Remove advertising instance and terminate BIG. 846 * broadcaster receiver: Teminate BIG sync and terminate PA sync. 847 */ 848 static void bis_cleanup(struct hci_conn *conn) 849 { 850 struct hci_dev *hdev = conn->hdev; 851 struct hci_conn *bis; 852 853 bt_dev_dbg(hdev, "conn %p", conn); 854 855 if (conn->role == HCI_ROLE_MASTER) { 856 if (!test_and_clear_bit(HCI_CONN_PER_ADV, &conn->flags)) 857 return; 858 859 /* Check if ISO connection is a BIS and terminate advertising 860 * set and BIG if there are no other connections using it. 861 */ 862 bis = hci_conn_hash_lookup_big(hdev, conn->iso_qos.bcast.big); 863 if (bis) 864 return; 865 866 hci_le_terminate_big(hdev, conn); 867 } else { 868 bis = hci_conn_hash_lookup_big_any_dst(hdev, 869 conn->iso_qos.bcast.big); 870 871 if (bis) 872 return; 873 874 hci_le_big_terminate(hdev, conn->iso_qos.bcast.big, 875 conn); 876 } 877 } 878 879 static int remove_cig_sync(struct hci_dev *hdev, void *data) 880 { 881 u8 handle = PTR_UINT(data); 882 883 return hci_le_remove_cig_sync(hdev, handle); 884 } 885 886 static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle) 887 { 888 bt_dev_dbg(hdev, "handle 0x%2.2x", handle); 889 890 return hci_cmd_sync_queue(hdev, remove_cig_sync, UINT_PTR(handle), 891 NULL); 892 } 893 894 static void find_cis(struct hci_conn *conn, void *data) 895 { 896 struct iso_list_data *d = data; 897 898 /* Ignore broadcast or if CIG don't match */ 899 if (!bacmp(&conn->dst, BDADDR_ANY) || d->cig != conn->iso_qos.ucast.cig) 900 return; 901 902 d->count++; 903 } 904 905 /* Cleanup CIS connection: 906 * 907 * Detects if there any CIS left connected in a CIG and remove it. 908 */ 909 static void cis_cleanup(struct hci_conn *conn) 910 { 911 struct hci_dev *hdev = conn->hdev; 912 struct iso_list_data d; 913 914 if (conn->iso_qos.ucast.cig == BT_ISO_QOS_CIG_UNSET) 915 return; 916 917 memset(&d, 0, sizeof(d)); 918 d.cig = conn->iso_qos.ucast.cig; 919 920 /* Check if ISO connection is a CIS and remove CIG if there are 921 * no other connections using it. 922 */ 923 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_BOUND, &d); 924 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECT, &d); 925 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECTED, &d); 926 if (d.count) 927 return; 928 929 hci_le_remove_cig(hdev, conn->iso_qos.ucast.cig); 930 } 931 932 static int hci_conn_hash_alloc_unset(struct hci_dev *hdev) 933 { 934 return ida_alloc_range(&hdev->unset_handle_ida, HCI_CONN_HANDLE_MAX + 1, 935 U16_MAX, GFP_ATOMIC); 936 } 937 938 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst, 939 u8 role, u16 handle) 940 { 941 struct hci_conn *conn; 942 943 bt_dev_dbg(hdev, "dst %pMR handle 0x%4.4x", dst, handle); 944 945 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 946 if (!conn) 947 return NULL; 948 949 bacpy(&conn->dst, dst); 950 bacpy(&conn->src, &hdev->bdaddr); 951 conn->handle = handle; 952 conn->hdev = hdev; 953 conn->type = type; 954 conn->role = role; 955 conn->mode = HCI_CM_ACTIVE; 956 conn->state = BT_OPEN; 957 conn->auth_type = HCI_AT_GENERAL_BONDING; 958 conn->io_capability = hdev->io_capability; 959 conn->remote_auth = 0xff; 960 conn->key_type = 0xff; 961 conn->rssi = HCI_RSSI_INVALID; 962 conn->tx_power = HCI_TX_POWER_INVALID; 963 conn->max_tx_power = HCI_TX_POWER_INVALID; 964 conn->sync_handle = HCI_SYNC_HANDLE_INVALID; 965 966 set_bit(HCI_CONN_POWER_SAVE, &conn->flags); 967 conn->disc_timeout = HCI_DISCONN_TIMEOUT; 968 969 /* Set Default Authenticated payload timeout to 30s */ 970 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT; 971 972 if (conn->role == HCI_ROLE_MASTER) 973 conn->out = true; 974 975 switch (type) { 976 case ACL_LINK: 977 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK; 978 break; 979 case LE_LINK: 980 /* conn->src should reflect the local identity address */ 981 hci_copy_identity_address(hdev, &conn->src, &conn->src_type); 982 break; 983 case ISO_LINK: 984 /* conn->src should reflect the local identity address */ 985 hci_copy_identity_address(hdev, &conn->src, &conn->src_type); 986 987 /* set proper cleanup function */ 988 if (!bacmp(dst, BDADDR_ANY)) 989 conn->cleanup = bis_cleanup; 990 else if (conn->role == HCI_ROLE_MASTER) 991 conn->cleanup = cis_cleanup; 992 993 break; 994 case SCO_LINK: 995 if (lmp_esco_capable(hdev)) 996 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) | 997 (hdev->esco_type & EDR_ESCO_MASK); 998 else 999 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK; 1000 break; 1001 case ESCO_LINK: 1002 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK; 1003 break; 1004 } 1005 1006 skb_queue_head_init(&conn->data_q); 1007 1008 INIT_LIST_HEAD(&conn->chan_list); 1009 INIT_LIST_HEAD(&conn->link_list); 1010 1011 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout); 1012 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept); 1013 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle); 1014 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout); 1015 1016 atomic_set(&conn->refcnt, 0); 1017 1018 hci_dev_hold(hdev); 1019 1020 hci_conn_hash_add(hdev, conn); 1021 1022 /* The SCO and eSCO connections will only be notified when their 1023 * setup has been completed. This is different to ACL links which 1024 * can be notified right away. 1025 */ 1026 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) { 1027 if (hdev->notify) 1028 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD); 1029 } 1030 1031 hci_conn_init_sysfs(conn); 1032 1033 return conn; 1034 } 1035 1036 struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type, 1037 bdaddr_t *dst, u8 role) 1038 { 1039 int handle; 1040 1041 bt_dev_dbg(hdev, "dst %pMR", dst); 1042 1043 handle = hci_conn_hash_alloc_unset(hdev); 1044 if (unlikely(handle < 0)) 1045 return NULL; 1046 1047 return hci_conn_add(hdev, type, dst, role, handle); 1048 } 1049 1050 static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason) 1051 { 1052 if (!reason) 1053 reason = HCI_ERROR_REMOTE_USER_TERM; 1054 1055 /* Due to race, SCO/ISO conn might be not established yet at this point, 1056 * and nothing else will clean it up. In other cases it is done via HCI 1057 * events. 1058 */ 1059 switch (conn->type) { 1060 case SCO_LINK: 1061 case ESCO_LINK: 1062 if (HCI_CONN_HANDLE_UNSET(conn->handle)) 1063 hci_conn_failed(conn, reason); 1064 break; 1065 case ISO_LINK: 1066 if (conn->state != BT_CONNECTED && 1067 !test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) 1068 hci_conn_failed(conn, reason); 1069 break; 1070 } 1071 } 1072 1073 static void hci_conn_unlink(struct hci_conn *conn) 1074 { 1075 struct hci_dev *hdev = conn->hdev; 1076 1077 bt_dev_dbg(hdev, "hcon %p", conn); 1078 1079 if (!conn->parent) { 1080 struct hci_link *link, *t; 1081 1082 list_for_each_entry_safe(link, t, &conn->link_list, list) { 1083 struct hci_conn *child = link->conn; 1084 1085 hci_conn_unlink(child); 1086 1087 /* If hdev is down it means 1088 * hci_dev_close_sync/hci_conn_hash_flush is in progress 1089 * and links don't need to be cleanup as all connections 1090 * would be cleanup. 1091 */ 1092 if (!test_bit(HCI_UP, &hdev->flags)) 1093 continue; 1094 1095 hci_conn_cleanup_child(child, conn->abort_reason); 1096 } 1097 1098 return; 1099 } 1100 1101 if (!conn->link) 1102 return; 1103 1104 list_del_rcu(&conn->link->list); 1105 synchronize_rcu(); 1106 1107 hci_conn_drop(conn->parent); 1108 hci_conn_put(conn->parent); 1109 conn->parent = NULL; 1110 1111 kfree(conn->link); 1112 conn->link = NULL; 1113 } 1114 1115 void hci_conn_del(struct hci_conn *conn) 1116 { 1117 struct hci_dev *hdev = conn->hdev; 1118 1119 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle); 1120 1121 hci_conn_unlink(conn); 1122 1123 cancel_delayed_work_sync(&conn->disc_work); 1124 cancel_delayed_work_sync(&conn->auto_accept_work); 1125 cancel_delayed_work_sync(&conn->idle_work); 1126 1127 if (conn->type == ACL_LINK) { 1128 /* Unacked frames */ 1129 hdev->acl_cnt += conn->sent; 1130 } else if (conn->type == LE_LINK) { 1131 cancel_delayed_work(&conn->le_conn_timeout); 1132 1133 if (hdev->le_pkts) 1134 hdev->le_cnt += conn->sent; 1135 else 1136 hdev->acl_cnt += conn->sent; 1137 } else { 1138 /* Unacked ISO frames */ 1139 if (conn->type == ISO_LINK) { 1140 if (hdev->iso_pkts) 1141 hdev->iso_cnt += conn->sent; 1142 else if (hdev->le_pkts) 1143 hdev->le_cnt += conn->sent; 1144 else 1145 hdev->acl_cnt += conn->sent; 1146 } 1147 } 1148 1149 if (conn->amp_mgr) 1150 amp_mgr_put(conn->amp_mgr); 1151 1152 skb_queue_purge(&conn->data_q); 1153 1154 /* Remove the connection from the list and cleanup its remaining 1155 * state. This is a separate function since for some cases like 1156 * BT_CONNECT_SCAN we *only* want the cleanup part without the 1157 * rest of hci_conn_del. 1158 */ 1159 hci_conn_cleanup(conn); 1160 } 1161 1162 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type) 1163 { 1164 int use_src = bacmp(src, BDADDR_ANY); 1165 struct hci_dev *hdev = NULL, *d; 1166 1167 BT_DBG("%pMR -> %pMR", src, dst); 1168 1169 read_lock(&hci_dev_list_lock); 1170 1171 list_for_each_entry(d, &hci_dev_list, list) { 1172 if (!test_bit(HCI_UP, &d->flags) || 1173 hci_dev_test_flag(d, HCI_USER_CHANNEL) || 1174 d->dev_type != HCI_PRIMARY) 1175 continue; 1176 1177 /* Simple routing: 1178 * No source address - find interface with bdaddr != dst 1179 * Source address - find interface with bdaddr == src 1180 */ 1181 1182 if (use_src) { 1183 bdaddr_t id_addr; 1184 u8 id_addr_type; 1185 1186 if (src_type == BDADDR_BREDR) { 1187 if (!lmp_bredr_capable(d)) 1188 continue; 1189 bacpy(&id_addr, &d->bdaddr); 1190 id_addr_type = BDADDR_BREDR; 1191 } else { 1192 if (!lmp_le_capable(d)) 1193 continue; 1194 1195 hci_copy_identity_address(d, &id_addr, 1196 &id_addr_type); 1197 1198 /* Convert from HCI to three-value type */ 1199 if (id_addr_type == ADDR_LE_DEV_PUBLIC) 1200 id_addr_type = BDADDR_LE_PUBLIC; 1201 else 1202 id_addr_type = BDADDR_LE_RANDOM; 1203 } 1204 1205 if (!bacmp(&id_addr, src) && id_addr_type == src_type) { 1206 hdev = d; break; 1207 } 1208 } else { 1209 if (bacmp(&d->bdaddr, dst)) { 1210 hdev = d; break; 1211 } 1212 } 1213 } 1214 1215 if (hdev) 1216 hdev = hci_dev_hold(hdev); 1217 1218 read_unlock(&hci_dev_list_lock); 1219 return hdev; 1220 } 1221 EXPORT_SYMBOL(hci_get_route); 1222 1223 /* This function requires the caller holds hdev->lock */ 1224 static void hci_le_conn_failed(struct hci_conn *conn, u8 status) 1225 { 1226 struct hci_dev *hdev = conn->hdev; 1227 1228 hci_connect_le_scan_cleanup(conn, status); 1229 1230 /* Enable advertising in case this was a failed connection 1231 * attempt as a peripheral. 1232 */ 1233 hci_enable_advertising(hdev); 1234 } 1235 1236 /* This function requires the caller holds hdev->lock */ 1237 void hci_conn_failed(struct hci_conn *conn, u8 status) 1238 { 1239 struct hci_dev *hdev = conn->hdev; 1240 1241 bt_dev_dbg(hdev, "status 0x%2.2x", status); 1242 1243 switch (conn->type) { 1244 case LE_LINK: 1245 hci_le_conn_failed(conn, status); 1246 break; 1247 case ACL_LINK: 1248 mgmt_connect_failed(hdev, &conn->dst, conn->type, 1249 conn->dst_type, status); 1250 break; 1251 } 1252 1253 conn->state = BT_CLOSED; 1254 hci_connect_cfm(conn, status); 1255 hci_conn_del(conn); 1256 } 1257 1258 /* This function requires the caller holds hdev->lock */ 1259 u8 hci_conn_set_handle(struct hci_conn *conn, u16 handle) 1260 { 1261 struct hci_dev *hdev = conn->hdev; 1262 1263 bt_dev_dbg(hdev, "hcon %p handle 0x%4.4x", conn, handle); 1264 1265 if (conn->handle == handle) 1266 return 0; 1267 1268 if (handle > HCI_CONN_HANDLE_MAX) { 1269 bt_dev_err(hdev, "Invalid handle: 0x%4.4x > 0x%4.4x", 1270 handle, HCI_CONN_HANDLE_MAX); 1271 return HCI_ERROR_INVALID_PARAMETERS; 1272 } 1273 1274 /* If abort_reason has been sent it means the connection is being 1275 * aborted and the handle shall not be changed. 1276 */ 1277 if (conn->abort_reason) 1278 return conn->abort_reason; 1279 1280 if (HCI_CONN_HANDLE_UNSET(conn->handle)) 1281 ida_free(&hdev->unset_handle_ida, conn->handle); 1282 1283 conn->handle = handle; 1284 1285 return 0; 1286 } 1287 1288 static void create_le_conn_complete(struct hci_dev *hdev, void *data, int err) 1289 { 1290 struct hci_conn *conn; 1291 u16 handle = PTR_UINT(data); 1292 1293 conn = hci_conn_hash_lookup_handle(hdev, handle); 1294 if (!conn) 1295 return; 1296 1297 bt_dev_dbg(hdev, "err %d", err); 1298 1299 hci_dev_lock(hdev); 1300 1301 if (!err) { 1302 hci_connect_le_scan_cleanup(conn, 0x00); 1303 goto done; 1304 } 1305 1306 /* Check if connection is still pending */ 1307 if (conn != hci_lookup_le_connect(hdev)) 1308 goto done; 1309 1310 /* Flush to make sure we send create conn cancel command if needed */ 1311 flush_delayed_work(&conn->le_conn_timeout); 1312 hci_conn_failed(conn, bt_status(err)); 1313 1314 done: 1315 hci_dev_unlock(hdev); 1316 } 1317 1318 static int hci_connect_le_sync(struct hci_dev *hdev, void *data) 1319 { 1320 struct hci_conn *conn; 1321 u16 handle = PTR_UINT(data); 1322 1323 conn = hci_conn_hash_lookup_handle(hdev, handle); 1324 if (!conn) 1325 return 0; 1326 1327 bt_dev_dbg(hdev, "conn %p", conn); 1328 1329 clear_bit(HCI_CONN_SCANNING, &conn->flags); 1330 conn->state = BT_CONNECT; 1331 1332 return hci_le_create_conn_sync(hdev, conn); 1333 } 1334 1335 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst, 1336 u8 dst_type, bool dst_resolved, u8 sec_level, 1337 u16 conn_timeout, u8 role) 1338 { 1339 struct hci_conn *conn; 1340 struct smp_irk *irk; 1341 int err; 1342 1343 /* Let's make sure that le is enabled.*/ 1344 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 1345 if (lmp_le_capable(hdev)) 1346 return ERR_PTR(-ECONNREFUSED); 1347 1348 return ERR_PTR(-EOPNOTSUPP); 1349 } 1350 1351 /* Since the controller supports only one LE connection attempt at a 1352 * time, we return -EBUSY if there is any connection attempt running. 1353 */ 1354 if (hci_lookup_le_connect(hdev)) 1355 return ERR_PTR(-EBUSY); 1356 1357 /* If there's already a connection object but it's not in 1358 * scanning state it means it must already be established, in 1359 * which case we can't do anything else except report a failure 1360 * to connect. 1361 */ 1362 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type); 1363 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) { 1364 return ERR_PTR(-EBUSY); 1365 } 1366 1367 /* Check if the destination address has been resolved by the controller 1368 * since if it did then the identity address shall be used. 1369 */ 1370 if (!dst_resolved) { 1371 /* When given an identity address with existing identity 1372 * resolving key, the connection needs to be established 1373 * to a resolvable random address. 1374 * 1375 * Storing the resolvable random address is required here 1376 * to handle connection failures. The address will later 1377 * be resolved back into the original identity address 1378 * from the connect request. 1379 */ 1380 irk = hci_find_irk_by_addr(hdev, dst, dst_type); 1381 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) { 1382 dst = &irk->rpa; 1383 dst_type = ADDR_LE_DEV_RANDOM; 1384 } 1385 } 1386 1387 if (conn) { 1388 bacpy(&conn->dst, dst); 1389 } else { 1390 conn = hci_conn_add_unset(hdev, LE_LINK, dst, role); 1391 if (!conn) 1392 return ERR_PTR(-ENOMEM); 1393 hci_conn_hold(conn); 1394 conn->pending_sec_level = sec_level; 1395 } 1396 1397 conn->dst_type = dst_type; 1398 conn->sec_level = BT_SECURITY_LOW; 1399 conn->conn_timeout = conn_timeout; 1400 1401 err = hci_cmd_sync_queue(hdev, hci_connect_le_sync, 1402 UINT_PTR(conn->handle), 1403 create_le_conn_complete); 1404 if (err) { 1405 hci_conn_del(conn); 1406 return ERR_PTR(err); 1407 } 1408 1409 return conn; 1410 } 1411 1412 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type) 1413 { 1414 struct hci_conn *conn; 1415 1416 conn = hci_conn_hash_lookup_le(hdev, addr, type); 1417 if (!conn) 1418 return false; 1419 1420 if (conn->state != BT_CONNECTED) 1421 return false; 1422 1423 return true; 1424 } 1425 1426 /* This function requires the caller holds hdev->lock */ 1427 static int hci_explicit_conn_params_set(struct hci_dev *hdev, 1428 bdaddr_t *addr, u8 addr_type) 1429 { 1430 struct hci_conn_params *params; 1431 1432 if (is_connected(hdev, addr, addr_type)) 1433 return -EISCONN; 1434 1435 params = hci_conn_params_lookup(hdev, addr, addr_type); 1436 if (!params) { 1437 params = hci_conn_params_add(hdev, addr, addr_type); 1438 if (!params) 1439 return -ENOMEM; 1440 1441 /* If we created new params, mark them to be deleted in 1442 * hci_connect_le_scan_cleanup. It's different case than 1443 * existing disabled params, those will stay after cleanup. 1444 */ 1445 params->auto_connect = HCI_AUTO_CONN_EXPLICIT; 1446 } 1447 1448 /* We're trying to connect, so make sure params are at pend_le_conns */ 1449 if (params->auto_connect == HCI_AUTO_CONN_DISABLED || 1450 params->auto_connect == HCI_AUTO_CONN_REPORT || 1451 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) { 1452 hci_pend_le_list_del_init(params); 1453 hci_pend_le_list_add(params, &hdev->pend_le_conns); 1454 } 1455 1456 params->explicit_connect = true; 1457 1458 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type, 1459 params->auto_connect); 1460 1461 return 0; 1462 } 1463 1464 static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos) 1465 { 1466 struct hci_conn *conn; 1467 u8 big; 1468 1469 /* Allocate a BIG if not set */ 1470 if (qos->bcast.big == BT_ISO_QOS_BIG_UNSET) { 1471 for (big = 0x00; big < 0xef; big++) { 1472 1473 conn = hci_conn_hash_lookup_big(hdev, big); 1474 if (!conn) 1475 break; 1476 } 1477 1478 if (big == 0xef) 1479 return -EADDRNOTAVAIL; 1480 1481 /* Update BIG */ 1482 qos->bcast.big = big; 1483 } 1484 1485 return 0; 1486 } 1487 1488 static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos) 1489 { 1490 struct hci_conn *conn; 1491 u8 bis; 1492 1493 /* Allocate BIS if not set */ 1494 if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) { 1495 /* Find an unused adv set to advertise BIS, skip instance 0x00 1496 * since it is reserved as general purpose set. 1497 */ 1498 for (bis = 0x01; bis < hdev->le_num_of_adv_sets; 1499 bis++) { 1500 1501 conn = hci_conn_hash_lookup_bis(hdev, BDADDR_ANY, bis); 1502 if (!conn) 1503 break; 1504 } 1505 1506 if (bis == hdev->le_num_of_adv_sets) 1507 return -EADDRNOTAVAIL; 1508 1509 /* Update BIS */ 1510 qos->bcast.bis = bis; 1511 } 1512 1513 return 0; 1514 } 1515 1516 /* This function requires the caller holds hdev->lock */ 1517 static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst, 1518 struct bt_iso_qos *qos, __u8 base_len, 1519 __u8 *base) 1520 { 1521 struct hci_conn *conn; 1522 int err; 1523 1524 /* Let's make sure that le is enabled.*/ 1525 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 1526 if (lmp_le_capable(hdev)) 1527 return ERR_PTR(-ECONNREFUSED); 1528 return ERR_PTR(-EOPNOTSUPP); 1529 } 1530 1531 err = qos_set_big(hdev, qos); 1532 if (err) 1533 return ERR_PTR(err); 1534 1535 err = qos_set_bis(hdev, qos); 1536 if (err) 1537 return ERR_PTR(err); 1538 1539 /* Check if the LE Create BIG command has already been sent */ 1540 conn = hci_conn_hash_lookup_per_adv_bis(hdev, dst, qos->bcast.big, 1541 qos->bcast.big); 1542 if (conn) 1543 return ERR_PTR(-EADDRINUSE); 1544 1545 /* Check BIS settings against other bound BISes, since all 1546 * BISes in a BIG must have the same value for all parameters 1547 */ 1548 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big); 1549 1550 if (conn && (memcmp(qos, &conn->iso_qos, sizeof(*qos)) || 1551 base_len != conn->le_per_adv_data_len || 1552 memcmp(conn->le_per_adv_data, base, base_len))) 1553 return ERR_PTR(-EADDRINUSE); 1554 1555 conn = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER); 1556 if (!conn) 1557 return ERR_PTR(-ENOMEM); 1558 1559 conn->state = BT_CONNECT; 1560 1561 hci_conn_hold(conn); 1562 return conn; 1563 } 1564 1565 /* This function requires the caller holds hdev->lock */ 1566 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst, 1567 u8 dst_type, u8 sec_level, 1568 u16 conn_timeout, 1569 enum conn_reasons conn_reason) 1570 { 1571 struct hci_conn *conn; 1572 1573 /* Let's make sure that le is enabled.*/ 1574 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 1575 if (lmp_le_capable(hdev)) 1576 return ERR_PTR(-ECONNREFUSED); 1577 1578 return ERR_PTR(-EOPNOTSUPP); 1579 } 1580 1581 /* Some devices send ATT messages as soon as the physical link is 1582 * established. To be able to handle these ATT messages, the user- 1583 * space first establishes the connection and then starts the pairing 1584 * process. 1585 * 1586 * So if a hci_conn object already exists for the following connection 1587 * attempt, we simply update pending_sec_level and auth_type fields 1588 * and return the object found. 1589 */ 1590 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type); 1591 if (conn) { 1592 if (conn->pending_sec_level < sec_level) 1593 conn->pending_sec_level = sec_level; 1594 goto done; 1595 } 1596 1597 BT_DBG("requesting refresh of dst_addr"); 1598 1599 conn = hci_conn_add_unset(hdev, LE_LINK, dst, HCI_ROLE_MASTER); 1600 if (!conn) 1601 return ERR_PTR(-ENOMEM); 1602 1603 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) { 1604 hci_conn_del(conn); 1605 return ERR_PTR(-EBUSY); 1606 } 1607 1608 conn->state = BT_CONNECT; 1609 set_bit(HCI_CONN_SCANNING, &conn->flags); 1610 conn->dst_type = dst_type; 1611 conn->sec_level = BT_SECURITY_LOW; 1612 conn->pending_sec_level = sec_level; 1613 conn->conn_timeout = conn_timeout; 1614 conn->conn_reason = conn_reason; 1615 1616 hci_update_passive_scan(hdev); 1617 1618 done: 1619 hci_conn_hold(conn); 1620 return conn; 1621 } 1622 1623 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst, 1624 u8 sec_level, u8 auth_type, 1625 enum conn_reasons conn_reason) 1626 { 1627 struct hci_conn *acl; 1628 1629 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) { 1630 if (lmp_bredr_capable(hdev)) 1631 return ERR_PTR(-ECONNREFUSED); 1632 1633 return ERR_PTR(-EOPNOTSUPP); 1634 } 1635 1636 /* Reject outgoing connection to device with same BD ADDR against 1637 * CVE-2020-26555 1638 */ 1639 if (!bacmp(&hdev->bdaddr, dst)) { 1640 bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n", 1641 dst); 1642 return ERR_PTR(-ECONNREFUSED); 1643 } 1644 1645 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst); 1646 if (!acl) { 1647 acl = hci_conn_add_unset(hdev, ACL_LINK, dst, HCI_ROLE_MASTER); 1648 if (!acl) 1649 return ERR_PTR(-ENOMEM); 1650 } 1651 1652 hci_conn_hold(acl); 1653 1654 acl->conn_reason = conn_reason; 1655 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) { 1656 acl->sec_level = BT_SECURITY_LOW; 1657 acl->pending_sec_level = sec_level; 1658 acl->auth_type = auth_type; 1659 hci_acl_create_connection(acl); 1660 } 1661 1662 return acl; 1663 } 1664 1665 static struct hci_link *hci_conn_link(struct hci_conn *parent, 1666 struct hci_conn *conn) 1667 { 1668 struct hci_dev *hdev = parent->hdev; 1669 struct hci_link *link; 1670 1671 bt_dev_dbg(hdev, "parent %p hcon %p", parent, conn); 1672 1673 if (conn->link) 1674 return conn->link; 1675 1676 if (conn->parent) 1677 return NULL; 1678 1679 link = kzalloc(sizeof(*link), GFP_KERNEL); 1680 if (!link) 1681 return NULL; 1682 1683 link->conn = hci_conn_hold(conn); 1684 conn->link = link; 1685 conn->parent = hci_conn_get(parent); 1686 1687 /* Use list_add_tail_rcu append to the list */ 1688 list_add_tail_rcu(&link->list, &parent->link_list); 1689 1690 return link; 1691 } 1692 1693 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst, 1694 __u16 setting, struct bt_codec *codec) 1695 { 1696 struct hci_conn *acl; 1697 struct hci_conn *sco; 1698 struct hci_link *link; 1699 1700 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING, 1701 CONN_REASON_SCO_CONNECT); 1702 if (IS_ERR(acl)) 1703 return acl; 1704 1705 sco = hci_conn_hash_lookup_ba(hdev, type, dst); 1706 if (!sco) { 1707 sco = hci_conn_add_unset(hdev, type, dst, HCI_ROLE_MASTER); 1708 if (!sco) { 1709 hci_conn_drop(acl); 1710 return ERR_PTR(-ENOMEM); 1711 } 1712 } 1713 1714 link = hci_conn_link(acl, sco); 1715 if (!link) { 1716 hci_conn_drop(acl); 1717 hci_conn_drop(sco); 1718 return ERR_PTR(-ENOLINK); 1719 } 1720 1721 sco->setting = setting; 1722 sco->codec = *codec; 1723 1724 if (acl->state == BT_CONNECTED && 1725 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) { 1726 set_bit(HCI_CONN_POWER_SAVE, &acl->flags); 1727 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON); 1728 1729 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) { 1730 /* defer SCO setup until mode change completed */ 1731 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags); 1732 return sco; 1733 } 1734 1735 hci_sco_setup(acl, 0x00); 1736 } 1737 1738 return sco; 1739 } 1740 1741 static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos) 1742 { 1743 struct hci_dev *hdev = conn->hdev; 1744 struct hci_cp_le_create_big cp; 1745 struct iso_list_data data; 1746 1747 memset(&cp, 0, sizeof(cp)); 1748 1749 data.big = qos->bcast.big; 1750 data.bis = qos->bcast.bis; 1751 data.count = 0; 1752 1753 /* Create a BIS for each bound connection */ 1754 hci_conn_hash_list_state(hdev, bis_list, ISO_LINK, 1755 BT_BOUND, &data); 1756 1757 cp.handle = qos->bcast.big; 1758 cp.adv_handle = qos->bcast.bis; 1759 cp.num_bis = data.count; 1760 hci_cpu_to_le24(qos->bcast.out.interval, cp.bis.sdu_interval); 1761 cp.bis.sdu = cpu_to_le16(qos->bcast.out.sdu); 1762 cp.bis.latency = cpu_to_le16(qos->bcast.out.latency); 1763 cp.bis.rtn = qos->bcast.out.rtn; 1764 cp.bis.phy = qos->bcast.out.phy; 1765 cp.bis.packing = qos->bcast.packing; 1766 cp.bis.framing = qos->bcast.framing; 1767 cp.bis.encryption = qos->bcast.encryption; 1768 memcpy(cp.bis.bcode, qos->bcast.bcode, sizeof(cp.bis.bcode)); 1769 1770 return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp); 1771 } 1772 1773 static int set_cig_params_sync(struct hci_dev *hdev, void *data) 1774 { 1775 u8 cig_id = PTR_UINT(data); 1776 struct hci_conn *conn; 1777 struct bt_iso_qos *qos; 1778 struct iso_cig_params pdu; 1779 u8 cis_id; 1780 1781 conn = hci_conn_hash_lookup_cig(hdev, cig_id); 1782 if (!conn) 1783 return 0; 1784 1785 memset(&pdu, 0, sizeof(pdu)); 1786 1787 qos = &conn->iso_qos; 1788 pdu.cp.cig_id = cig_id; 1789 hci_cpu_to_le24(qos->ucast.out.interval, pdu.cp.c_interval); 1790 hci_cpu_to_le24(qos->ucast.in.interval, pdu.cp.p_interval); 1791 pdu.cp.sca = qos->ucast.sca; 1792 pdu.cp.packing = qos->ucast.packing; 1793 pdu.cp.framing = qos->ucast.framing; 1794 pdu.cp.c_latency = cpu_to_le16(qos->ucast.out.latency); 1795 pdu.cp.p_latency = cpu_to_le16(qos->ucast.in.latency); 1796 1797 /* Reprogram all CIS(s) with the same CIG, valid range are: 1798 * num_cis: 0x00 to 0x1F 1799 * cis_id: 0x00 to 0xEF 1800 */ 1801 for (cis_id = 0x00; cis_id < 0xf0 && 1802 pdu.cp.num_cis < ARRAY_SIZE(pdu.cis); cis_id++) { 1803 struct hci_cis_params *cis; 1804 1805 conn = hci_conn_hash_lookup_cis(hdev, NULL, 0, cig_id, cis_id); 1806 if (!conn) 1807 continue; 1808 1809 qos = &conn->iso_qos; 1810 1811 cis = &pdu.cis[pdu.cp.num_cis++]; 1812 cis->cis_id = cis_id; 1813 cis->c_sdu = cpu_to_le16(conn->iso_qos.ucast.out.sdu); 1814 cis->p_sdu = cpu_to_le16(conn->iso_qos.ucast.in.sdu); 1815 cis->c_phy = qos->ucast.out.phy ? qos->ucast.out.phy : 1816 qos->ucast.in.phy; 1817 cis->p_phy = qos->ucast.in.phy ? qos->ucast.in.phy : 1818 qos->ucast.out.phy; 1819 cis->c_rtn = qos->ucast.out.rtn; 1820 cis->p_rtn = qos->ucast.in.rtn; 1821 } 1822 1823 if (!pdu.cp.num_cis) 1824 return 0; 1825 1826 return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS, 1827 sizeof(pdu.cp) + 1828 pdu.cp.num_cis * sizeof(pdu.cis[0]), &pdu, 1829 HCI_CMD_TIMEOUT); 1830 } 1831 1832 static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos) 1833 { 1834 struct hci_dev *hdev = conn->hdev; 1835 struct iso_list_data data; 1836 1837 memset(&data, 0, sizeof(data)); 1838 1839 /* Allocate first still reconfigurable CIG if not set */ 1840 if (qos->ucast.cig == BT_ISO_QOS_CIG_UNSET) { 1841 for (data.cig = 0x00; data.cig < 0xf0; data.cig++) { 1842 data.count = 0; 1843 1844 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, 1845 BT_CONNECT, &data); 1846 if (data.count) 1847 continue; 1848 1849 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, 1850 BT_CONNECTED, &data); 1851 if (!data.count) 1852 break; 1853 } 1854 1855 if (data.cig == 0xf0) 1856 return false; 1857 1858 /* Update CIG */ 1859 qos->ucast.cig = data.cig; 1860 } 1861 1862 if (qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) { 1863 if (hci_conn_hash_lookup_cis(hdev, NULL, 0, qos->ucast.cig, 1864 qos->ucast.cis)) 1865 return false; 1866 goto done; 1867 } 1868 1869 /* Allocate first available CIS if not set */ 1870 for (data.cig = qos->ucast.cig, data.cis = 0x00; data.cis < 0xf0; 1871 data.cis++) { 1872 if (!hci_conn_hash_lookup_cis(hdev, NULL, 0, data.cig, 1873 data.cis)) { 1874 /* Update CIS */ 1875 qos->ucast.cis = data.cis; 1876 break; 1877 } 1878 } 1879 1880 if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET) 1881 return false; 1882 1883 done: 1884 if (hci_cmd_sync_queue(hdev, set_cig_params_sync, 1885 UINT_PTR(qos->ucast.cig), NULL) < 0) 1886 return false; 1887 1888 return true; 1889 } 1890 1891 struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst, 1892 __u8 dst_type, struct bt_iso_qos *qos) 1893 { 1894 struct hci_conn *cis; 1895 1896 cis = hci_conn_hash_lookup_cis(hdev, dst, dst_type, qos->ucast.cig, 1897 qos->ucast.cis); 1898 if (!cis) { 1899 cis = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER); 1900 if (!cis) 1901 return ERR_PTR(-ENOMEM); 1902 cis->cleanup = cis_cleanup; 1903 cis->dst_type = dst_type; 1904 cis->iso_qos.ucast.cig = BT_ISO_QOS_CIG_UNSET; 1905 cis->iso_qos.ucast.cis = BT_ISO_QOS_CIS_UNSET; 1906 } 1907 1908 if (cis->state == BT_CONNECTED) 1909 return cis; 1910 1911 /* Check if CIS has been set and the settings matches */ 1912 if (cis->state == BT_BOUND && 1913 !memcmp(&cis->iso_qos, qos, sizeof(*qos))) 1914 return cis; 1915 1916 /* Update LINK PHYs according to QoS preference */ 1917 cis->le_tx_phy = qos->ucast.out.phy; 1918 cis->le_rx_phy = qos->ucast.in.phy; 1919 1920 /* If output interval is not set use the input interval as it cannot be 1921 * 0x000000. 1922 */ 1923 if (!qos->ucast.out.interval) 1924 qos->ucast.out.interval = qos->ucast.in.interval; 1925 1926 /* If input interval is not set use the output interval as it cannot be 1927 * 0x000000. 1928 */ 1929 if (!qos->ucast.in.interval) 1930 qos->ucast.in.interval = qos->ucast.out.interval; 1931 1932 /* If output latency is not set use the input latency as it cannot be 1933 * 0x0000. 1934 */ 1935 if (!qos->ucast.out.latency) 1936 qos->ucast.out.latency = qos->ucast.in.latency; 1937 1938 /* If input latency is not set use the output latency as it cannot be 1939 * 0x0000. 1940 */ 1941 if (!qos->ucast.in.latency) 1942 qos->ucast.in.latency = qos->ucast.out.latency; 1943 1944 if (!hci_le_set_cig_params(cis, qos)) { 1945 hci_conn_drop(cis); 1946 return ERR_PTR(-EINVAL); 1947 } 1948 1949 hci_conn_hold(cis); 1950 1951 cis->iso_qos = *qos; 1952 cis->state = BT_BOUND; 1953 1954 return cis; 1955 } 1956 1957 bool hci_iso_setup_path(struct hci_conn *conn) 1958 { 1959 struct hci_dev *hdev = conn->hdev; 1960 struct hci_cp_le_setup_iso_path cmd; 1961 1962 memset(&cmd, 0, sizeof(cmd)); 1963 1964 if (conn->iso_qos.ucast.out.sdu) { 1965 cmd.handle = cpu_to_le16(conn->handle); 1966 cmd.direction = 0x00; /* Input (Host to Controller) */ 1967 cmd.path = 0x00; /* HCI path if enabled */ 1968 cmd.codec = 0x03; /* Transparent Data */ 1969 1970 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd), 1971 &cmd) < 0) 1972 return false; 1973 } 1974 1975 if (conn->iso_qos.ucast.in.sdu) { 1976 cmd.handle = cpu_to_le16(conn->handle); 1977 cmd.direction = 0x01; /* Output (Controller to Host) */ 1978 cmd.path = 0x00; /* HCI path if enabled */ 1979 cmd.codec = 0x03; /* Transparent Data */ 1980 1981 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd), 1982 &cmd) < 0) 1983 return false; 1984 } 1985 1986 return true; 1987 } 1988 1989 int hci_conn_check_create_cis(struct hci_conn *conn) 1990 { 1991 if (conn->type != ISO_LINK || !bacmp(&conn->dst, BDADDR_ANY)) 1992 return -EINVAL; 1993 1994 if (!conn->parent || conn->parent->state != BT_CONNECTED || 1995 conn->state != BT_CONNECT || HCI_CONN_HANDLE_UNSET(conn->handle)) 1996 return 1; 1997 1998 return 0; 1999 } 2000 2001 static int hci_create_cis_sync(struct hci_dev *hdev, void *data) 2002 { 2003 return hci_le_create_cis_sync(hdev); 2004 } 2005 2006 int hci_le_create_cis_pending(struct hci_dev *hdev) 2007 { 2008 struct hci_conn *conn; 2009 bool pending = false; 2010 2011 rcu_read_lock(); 2012 2013 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) { 2014 if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) { 2015 rcu_read_unlock(); 2016 return -EBUSY; 2017 } 2018 2019 if (!hci_conn_check_create_cis(conn)) 2020 pending = true; 2021 } 2022 2023 rcu_read_unlock(); 2024 2025 if (!pending) 2026 return 0; 2027 2028 /* Queue Create CIS */ 2029 return hci_cmd_sync_queue(hdev, hci_create_cis_sync, NULL, NULL); 2030 } 2031 2032 static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn, 2033 struct bt_iso_io_qos *qos, __u8 phy) 2034 { 2035 /* Only set MTU if PHY is enabled */ 2036 if (!qos->sdu && qos->phy) { 2037 if (hdev->iso_mtu > 0) 2038 qos->sdu = hdev->iso_mtu; 2039 else if (hdev->le_mtu > 0) 2040 qos->sdu = hdev->le_mtu; 2041 else 2042 qos->sdu = hdev->acl_mtu; 2043 } 2044 2045 /* Use the same PHY as ACL if set to any */ 2046 if (qos->phy == BT_ISO_PHY_ANY) 2047 qos->phy = phy; 2048 2049 /* Use LE ACL connection interval if not set */ 2050 if (!qos->interval) 2051 /* ACL interval unit in 1.25 ms to us */ 2052 qos->interval = conn->le_conn_interval * 1250; 2053 2054 /* Use LE ACL connection latency if not set */ 2055 if (!qos->latency) 2056 qos->latency = conn->le_conn_latency; 2057 } 2058 2059 static int create_big_sync(struct hci_dev *hdev, void *data) 2060 { 2061 struct hci_conn *conn = data; 2062 struct bt_iso_qos *qos = &conn->iso_qos; 2063 u16 interval, sync_interval = 0; 2064 u32 flags = 0; 2065 int err; 2066 2067 if (qos->bcast.out.phy == 0x02) 2068 flags |= MGMT_ADV_FLAG_SEC_2M; 2069 2070 /* Align intervals */ 2071 interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor; 2072 2073 if (qos->bcast.bis) 2074 sync_interval = interval * 4; 2075 2076 err = hci_start_per_adv_sync(hdev, qos->bcast.bis, conn->le_per_adv_data_len, 2077 conn->le_per_adv_data, flags, interval, 2078 interval, sync_interval); 2079 if (err) 2080 return err; 2081 2082 return hci_le_create_big(conn, &conn->iso_qos); 2083 } 2084 2085 static void create_pa_complete(struct hci_dev *hdev, void *data, int err) 2086 { 2087 struct hci_cp_le_pa_create_sync *cp = data; 2088 2089 bt_dev_dbg(hdev, ""); 2090 2091 if (err) 2092 bt_dev_err(hdev, "Unable to create PA: %d", err); 2093 2094 kfree(cp); 2095 } 2096 2097 static int create_pa_sync(struct hci_dev *hdev, void *data) 2098 { 2099 struct hci_cp_le_pa_create_sync *cp = data; 2100 int err; 2101 2102 err = __hci_cmd_sync_status(hdev, HCI_OP_LE_PA_CREATE_SYNC, 2103 sizeof(*cp), cp, HCI_CMD_TIMEOUT); 2104 if (err) { 2105 hci_dev_clear_flag(hdev, HCI_PA_SYNC); 2106 return err; 2107 } 2108 2109 return hci_update_passive_scan_sync(hdev); 2110 } 2111 2112 int hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst, __u8 dst_type, 2113 __u8 sid, struct bt_iso_qos *qos) 2114 { 2115 struct hci_cp_le_pa_create_sync *cp; 2116 2117 if (hci_dev_test_and_set_flag(hdev, HCI_PA_SYNC)) 2118 return -EBUSY; 2119 2120 cp = kzalloc(sizeof(*cp), GFP_KERNEL); 2121 if (!cp) { 2122 hci_dev_clear_flag(hdev, HCI_PA_SYNC); 2123 return -ENOMEM; 2124 } 2125 2126 cp->options = qos->bcast.options; 2127 cp->sid = sid; 2128 cp->addr_type = dst_type; 2129 bacpy(&cp->addr, dst); 2130 cp->skip = cpu_to_le16(qos->bcast.skip); 2131 cp->sync_timeout = cpu_to_le16(qos->bcast.sync_timeout); 2132 cp->sync_cte_type = qos->bcast.sync_cte_type; 2133 2134 /* Queue start pa_create_sync and scan */ 2135 return hci_cmd_sync_queue(hdev, create_pa_sync, cp, create_pa_complete); 2136 } 2137 2138 int hci_le_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon, 2139 struct bt_iso_qos *qos, 2140 __u16 sync_handle, __u8 num_bis, __u8 bis[]) 2141 { 2142 struct _packed { 2143 struct hci_cp_le_big_create_sync cp; 2144 __u8 bis[0x11]; 2145 } pdu; 2146 int err; 2147 2148 if (num_bis > sizeof(pdu.bis)) 2149 return -EINVAL; 2150 2151 err = qos_set_big(hdev, qos); 2152 if (err) 2153 return err; 2154 2155 if (hcon) 2156 hcon->iso_qos.bcast.big = qos->bcast.big; 2157 2158 memset(&pdu, 0, sizeof(pdu)); 2159 pdu.cp.handle = qos->bcast.big; 2160 pdu.cp.sync_handle = cpu_to_le16(sync_handle); 2161 pdu.cp.encryption = qos->bcast.encryption; 2162 memcpy(pdu.cp.bcode, qos->bcast.bcode, sizeof(pdu.cp.bcode)); 2163 pdu.cp.mse = qos->bcast.mse; 2164 pdu.cp.timeout = cpu_to_le16(qos->bcast.timeout); 2165 pdu.cp.num_bis = num_bis; 2166 memcpy(pdu.bis, bis, num_bis); 2167 2168 return hci_send_cmd(hdev, HCI_OP_LE_BIG_CREATE_SYNC, 2169 sizeof(pdu.cp) + num_bis, &pdu); 2170 } 2171 2172 static void create_big_complete(struct hci_dev *hdev, void *data, int err) 2173 { 2174 struct hci_conn *conn = data; 2175 2176 bt_dev_dbg(hdev, "conn %p", conn); 2177 2178 if (err) { 2179 bt_dev_err(hdev, "Unable to create BIG: %d", err); 2180 hci_connect_cfm(conn, err); 2181 hci_conn_del(conn); 2182 } 2183 } 2184 2185 struct hci_conn *hci_bind_bis(struct hci_dev *hdev, bdaddr_t *dst, 2186 struct bt_iso_qos *qos, 2187 __u8 base_len, __u8 *base) 2188 { 2189 struct hci_conn *conn; 2190 __u8 eir[HCI_MAX_PER_AD_LENGTH]; 2191 2192 if (base_len && base) 2193 base_len = eir_append_service_data(eir, 0, 0x1851, 2194 base, base_len); 2195 2196 /* We need hci_conn object using the BDADDR_ANY as dst */ 2197 conn = hci_add_bis(hdev, dst, qos, base_len, eir); 2198 if (IS_ERR(conn)) 2199 return conn; 2200 2201 /* Update LINK PHYs according to QoS preference */ 2202 conn->le_tx_phy = qos->bcast.out.phy; 2203 conn->le_tx_phy = qos->bcast.out.phy; 2204 2205 /* Add Basic Announcement into Peridic Adv Data if BASE is set */ 2206 if (base_len && base) { 2207 memcpy(conn->le_per_adv_data, eir, sizeof(eir)); 2208 conn->le_per_adv_data_len = base_len; 2209 } 2210 2211 hci_iso_qos_setup(hdev, conn, &qos->bcast.out, 2212 conn->le_tx_phy ? conn->le_tx_phy : 2213 hdev->le_tx_def_phys); 2214 2215 conn->iso_qos = *qos; 2216 conn->state = BT_BOUND; 2217 2218 return conn; 2219 } 2220 2221 static void bis_mark_per_adv(struct hci_conn *conn, void *data) 2222 { 2223 struct iso_list_data *d = data; 2224 2225 /* Skip if not broadcast/ANY address */ 2226 if (bacmp(&conn->dst, BDADDR_ANY)) 2227 return; 2228 2229 if (d->big != conn->iso_qos.bcast.big || 2230 d->bis == BT_ISO_QOS_BIS_UNSET || 2231 d->bis != conn->iso_qos.bcast.bis) 2232 return; 2233 2234 set_bit(HCI_CONN_PER_ADV, &conn->flags); 2235 } 2236 2237 struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst, 2238 __u8 dst_type, struct bt_iso_qos *qos, 2239 __u8 base_len, __u8 *base) 2240 { 2241 struct hci_conn *conn; 2242 int err; 2243 struct iso_list_data data; 2244 2245 conn = hci_bind_bis(hdev, dst, qos, base_len, base); 2246 if (IS_ERR(conn)) 2247 return conn; 2248 2249 data.big = qos->bcast.big; 2250 data.bis = qos->bcast.bis; 2251 2252 /* Set HCI_CONN_PER_ADV for all bound connections, to mark that 2253 * the start periodic advertising and create BIG commands have 2254 * been queued 2255 */ 2256 hci_conn_hash_list_state(hdev, bis_mark_per_adv, ISO_LINK, 2257 BT_BOUND, &data); 2258 2259 /* Queue start periodic advertising and create BIG */ 2260 err = hci_cmd_sync_queue(hdev, create_big_sync, conn, 2261 create_big_complete); 2262 if (err < 0) { 2263 hci_conn_drop(conn); 2264 return ERR_PTR(err); 2265 } 2266 2267 return conn; 2268 } 2269 2270 struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst, 2271 __u8 dst_type, struct bt_iso_qos *qos) 2272 { 2273 struct hci_conn *le; 2274 struct hci_conn *cis; 2275 struct hci_link *link; 2276 2277 if (hci_dev_test_flag(hdev, HCI_ADVERTISING)) 2278 le = hci_connect_le(hdev, dst, dst_type, false, 2279 BT_SECURITY_LOW, 2280 HCI_LE_CONN_TIMEOUT, 2281 HCI_ROLE_SLAVE); 2282 else 2283 le = hci_connect_le_scan(hdev, dst, dst_type, 2284 BT_SECURITY_LOW, 2285 HCI_LE_CONN_TIMEOUT, 2286 CONN_REASON_ISO_CONNECT); 2287 if (IS_ERR(le)) 2288 return le; 2289 2290 hci_iso_qos_setup(hdev, le, &qos->ucast.out, 2291 le->le_tx_phy ? le->le_tx_phy : hdev->le_tx_def_phys); 2292 hci_iso_qos_setup(hdev, le, &qos->ucast.in, 2293 le->le_rx_phy ? le->le_rx_phy : hdev->le_rx_def_phys); 2294 2295 cis = hci_bind_cis(hdev, dst, dst_type, qos); 2296 if (IS_ERR(cis)) { 2297 hci_conn_drop(le); 2298 return cis; 2299 } 2300 2301 link = hci_conn_link(le, cis); 2302 if (!link) { 2303 hci_conn_drop(le); 2304 hci_conn_drop(cis); 2305 return ERR_PTR(-ENOLINK); 2306 } 2307 2308 /* Link takes the refcount */ 2309 hci_conn_drop(cis); 2310 2311 cis->state = BT_CONNECT; 2312 2313 hci_le_create_cis_pending(hdev); 2314 2315 return cis; 2316 } 2317 2318 /* Check link security requirement */ 2319 int hci_conn_check_link_mode(struct hci_conn *conn) 2320 { 2321 BT_DBG("hcon %p", conn); 2322 2323 /* In Secure Connections Only mode, it is required that Secure 2324 * Connections is used and the link is encrypted with AES-CCM 2325 * using a P-256 authenticated combination key. 2326 */ 2327 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) { 2328 if (!hci_conn_sc_enabled(conn) || 2329 !test_bit(HCI_CONN_AES_CCM, &conn->flags) || 2330 conn->key_type != HCI_LK_AUTH_COMBINATION_P256) 2331 return 0; 2332 } 2333 2334 /* AES encryption is required for Level 4: 2335 * 2336 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C 2337 * page 1319: 2338 * 2339 * 128-bit equivalent strength for link and encryption keys 2340 * required using FIPS approved algorithms (E0 not allowed, 2341 * SAFER+ not allowed, and P-192 not allowed; encryption key 2342 * not shortened) 2343 */ 2344 if (conn->sec_level == BT_SECURITY_FIPS && 2345 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) { 2346 bt_dev_err(conn->hdev, 2347 "Invalid security: Missing AES-CCM usage"); 2348 return 0; 2349 } 2350 2351 if (hci_conn_ssp_enabled(conn) && 2352 !test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 2353 return 0; 2354 2355 return 1; 2356 } 2357 2358 /* Authenticate remote device */ 2359 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type) 2360 { 2361 BT_DBG("hcon %p", conn); 2362 2363 if (conn->pending_sec_level > sec_level) 2364 sec_level = conn->pending_sec_level; 2365 2366 if (sec_level > conn->sec_level) 2367 conn->pending_sec_level = sec_level; 2368 else if (test_bit(HCI_CONN_AUTH, &conn->flags)) 2369 return 1; 2370 2371 /* Make sure we preserve an existing MITM requirement*/ 2372 auth_type |= (conn->auth_type & 0x01); 2373 2374 conn->auth_type = auth_type; 2375 2376 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) { 2377 struct hci_cp_auth_requested cp; 2378 2379 cp.handle = cpu_to_le16(conn->handle); 2380 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED, 2381 sizeof(cp), &cp); 2382 2383 /* If we're already encrypted set the REAUTH_PEND flag, 2384 * otherwise set the ENCRYPT_PEND. 2385 */ 2386 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 2387 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags); 2388 else 2389 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags); 2390 } 2391 2392 return 0; 2393 } 2394 2395 /* Encrypt the link */ 2396 static void hci_conn_encrypt(struct hci_conn *conn) 2397 { 2398 BT_DBG("hcon %p", conn); 2399 2400 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) { 2401 struct hci_cp_set_conn_encrypt cp; 2402 cp.handle = cpu_to_le16(conn->handle); 2403 cp.encrypt = 0x01; 2404 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp), 2405 &cp); 2406 } 2407 } 2408 2409 /* Enable security */ 2410 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type, 2411 bool initiator) 2412 { 2413 BT_DBG("hcon %p", conn); 2414 2415 if (conn->type == LE_LINK) 2416 return smp_conn_security(conn, sec_level); 2417 2418 /* For sdp we don't need the link key. */ 2419 if (sec_level == BT_SECURITY_SDP) 2420 return 1; 2421 2422 /* For non 2.1 devices and low security level we don't need the link 2423 key. */ 2424 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn)) 2425 return 1; 2426 2427 /* For other security levels we need the link key. */ 2428 if (!test_bit(HCI_CONN_AUTH, &conn->flags)) 2429 goto auth; 2430 2431 switch (conn->key_type) { 2432 case HCI_LK_AUTH_COMBINATION_P256: 2433 /* An authenticated FIPS approved combination key has 2434 * sufficient security for security level 4 or lower. 2435 */ 2436 if (sec_level <= BT_SECURITY_FIPS) 2437 goto encrypt; 2438 break; 2439 case HCI_LK_AUTH_COMBINATION_P192: 2440 /* An authenticated combination key has sufficient security for 2441 * security level 3 or lower. 2442 */ 2443 if (sec_level <= BT_SECURITY_HIGH) 2444 goto encrypt; 2445 break; 2446 case HCI_LK_UNAUTH_COMBINATION_P192: 2447 case HCI_LK_UNAUTH_COMBINATION_P256: 2448 /* An unauthenticated combination key has sufficient security 2449 * for security level 2 or lower. 2450 */ 2451 if (sec_level <= BT_SECURITY_MEDIUM) 2452 goto encrypt; 2453 break; 2454 case HCI_LK_COMBINATION: 2455 /* A combination key has always sufficient security for the 2456 * security levels 2 or lower. High security level requires the 2457 * combination key is generated using maximum PIN code length 2458 * (16). For pre 2.1 units. 2459 */ 2460 if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16) 2461 goto encrypt; 2462 break; 2463 default: 2464 break; 2465 } 2466 2467 auth: 2468 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) 2469 return 0; 2470 2471 if (initiator) 2472 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags); 2473 2474 if (!hci_conn_auth(conn, sec_level, auth_type)) 2475 return 0; 2476 2477 encrypt: 2478 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) { 2479 /* Ensure that the encryption key size has been read, 2480 * otherwise stall the upper layer responses. 2481 */ 2482 if (!conn->enc_key_size) 2483 return 0; 2484 2485 /* Nothing else needed, all requirements are met */ 2486 return 1; 2487 } 2488 2489 hci_conn_encrypt(conn); 2490 return 0; 2491 } 2492 EXPORT_SYMBOL(hci_conn_security); 2493 2494 /* Check secure link requirement */ 2495 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level) 2496 { 2497 BT_DBG("hcon %p", conn); 2498 2499 /* Accept if non-secure or higher security level is required */ 2500 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS) 2501 return 1; 2502 2503 /* Accept if secure or higher security level is already present */ 2504 if (conn->sec_level == BT_SECURITY_HIGH || 2505 conn->sec_level == BT_SECURITY_FIPS) 2506 return 1; 2507 2508 /* Reject not secure link */ 2509 return 0; 2510 } 2511 EXPORT_SYMBOL(hci_conn_check_secure); 2512 2513 /* Switch role */ 2514 int hci_conn_switch_role(struct hci_conn *conn, __u8 role) 2515 { 2516 BT_DBG("hcon %p", conn); 2517 2518 if (role == conn->role) 2519 return 1; 2520 2521 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) { 2522 struct hci_cp_switch_role cp; 2523 bacpy(&cp.bdaddr, &conn->dst); 2524 cp.role = role; 2525 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp); 2526 } 2527 2528 return 0; 2529 } 2530 EXPORT_SYMBOL(hci_conn_switch_role); 2531 2532 /* Enter active mode */ 2533 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active) 2534 { 2535 struct hci_dev *hdev = conn->hdev; 2536 2537 BT_DBG("hcon %p mode %d", conn, conn->mode); 2538 2539 if (conn->mode != HCI_CM_SNIFF) 2540 goto timer; 2541 2542 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active) 2543 goto timer; 2544 2545 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { 2546 struct hci_cp_exit_sniff_mode cp; 2547 cp.handle = cpu_to_le16(conn->handle); 2548 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp); 2549 } 2550 2551 timer: 2552 if (hdev->idle_timeout > 0) 2553 queue_delayed_work(hdev->workqueue, &conn->idle_work, 2554 msecs_to_jiffies(hdev->idle_timeout)); 2555 } 2556 2557 /* Drop all connection on the device */ 2558 void hci_conn_hash_flush(struct hci_dev *hdev) 2559 { 2560 struct list_head *head = &hdev->conn_hash.list; 2561 struct hci_conn *conn; 2562 2563 BT_DBG("hdev %s", hdev->name); 2564 2565 /* We should not traverse the list here, because hci_conn_del 2566 * can remove extra links, which may cause the list traversal 2567 * to hit items that have already been released. 2568 */ 2569 while ((conn = list_first_entry_or_null(head, 2570 struct hci_conn, 2571 list)) != NULL) { 2572 conn->state = BT_CLOSED; 2573 hci_disconn_cfm(conn, HCI_ERROR_LOCAL_HOST_TERM); 2574 hci_conn_del(conn); 2575 } 2576 } 2577 2578 /* Check pending connect attempts */ 2579 void hci_conn_check_pending(struct hci_dev *hdev) 2580 { 2581 struct hci_conn *conn; 2582 2583 BT_DBG("hdev %s", hdev->name); 2584 2585 hci_dev_lock(hdev); 2586 2587 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2); 2588 if (conn) 2589 hci_acl_create_connection(conn); 2590 2591 hci_dev_unlock(hdev); 2592 } 2593 2594 static u32 get_link_mode(struct hci_conn *conn) 2595 { 2596 u32 link_mode = 0; 2597 2598 if (conn->role == HCI_ROLE_MASTER) 2599 link_mode |= HCI_LM_MASTER; 2600 2601 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 2602 link_mode |= HCI_LM_ENCRYPT; 2603 2604 if (test_bit(HCI_CONN_AUTH, &conn->flags)) 2605 link_mode |= HCI_LM_AUTH; 2606 2607 if (test_bit(HCI_CONN_SECURE, &conn->flags)) 2608 link_mode |= HCI_LM_SECURE; 2609 2610 if (test_bit(HCI_CONN_FIPS, &conn->flags)) 2611 link_mode |= HCI_LM_FIPS; 2612 2613 return link_mode; 2614 } 2615 2616 int hci_get_conn_list(void __user *arg) 2617 { 2618 struct hci_conn *c; 2619 struct hci_conn_list_req req, *cl; 2620 struct hci_conn_info *ci; 2621 struct hci_dev *hdev; 2622 int n = 0, size, err; 2623 2624 if (copy_from_user(&req, arg, sizeof(req))) 2625 return -EFAULT; 2626 2627 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci)) 2628 return -EINVAL; 2629 2630 size = sizeof(req) + req.conn_num * sizeof(*ci); 2631 2632 cl = kmalloc(size, GFP_KERNEL); 2633 if (!cl) 2634 return -ENOMEM; 2635 2636 hdev = hci_dev_get(req.dev_id); 2637 if (!hdev) { 2638 kfree(cl); 2639 return -ENODEV; 2640 } 2641 2642 ci = cl->conn_info; 2643 2644 hci_dev_lock(hdev); 2645 list_for_each_entry(c, &hdev->conn_hash.list, list) { 2646 bacpy(&(ci + n)->bdaddr, &c->dst); 2647 (ci + n)->handle = c->handle; 2648 (ci + n)->type = c->type; 2649 (ci + n)->out = c->out; 2650 (ci + n)->state = c->state; 2651 (ci + n)->link_mode = get_link_mode(c); 2652 if (++n >= req.conn_num) 2653 break; 2654 } 2655 hci_dev_unlock(hdev); 2656 2657 cl->dev_id = hdev->id; 2658 cl->conn_num = n; 2659 size = sizeof(req) + n * sizeof(*ci); 2660 2661 hci_dev_put(hdev); 2662 2663 err = copy_to_user(arg, cl, size); 2664 kfree(cl); 2665 2666 return err ? -EFAULT : 0; 2667 } 2668 2669 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg) 2670 { 2671 struct hci_conn_info_req req; 2672 struct hci_conn_info ci; 2673 struct hci_conn *conn; 2674 char __user *ptr = arg + sizeof(req); 2675 2676 if (copy_from_user(&req, arg, sizeof(req))) 2677 return -EFAULT; 2678 2679 hci_dev_lock(hdev); 2680 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr); 2681 if (conn) { 2682 bacpy(&ci.bdaddr, &conn->dst); 2683 ci.handle = conn->handle; 2684 ci.type = conn->type; 2685 ci.out = conn->out; 2686 ci.state = conn->state; 2687 ci.link_mode = get_link_mode(conn); 2688 } 2689 hci_dev_unlock(hdev); 2690 2691 if (!conn) 2692 return -ENOENT; 2693 2694 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0; 2695 } 2696 2697 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg) 2698 { 2699 struct hci_auth_info_req req; 2700 struct hci_conn *conn; 2701 2702 if (copy_from_user(&req, arg, sizeof(req))) 2703 return -EFAULT; 2704 2705 hci_dev_lock(hdev); 2706 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr); 2707 if (conn) 2708 req.type = conn->auth_type; 2709 hci_dev_unlock(hdev); 2710 2711 if (!conn) 2712 return -ENOENT; 2713 2714 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0; 2715 } 2716 2717 struct hci_chan *hci_chan_create(struct hci_conn *conn) 2718 { 2719 struct hci_dev *hdev = conn->hdev; 2720 struct hci_chan *chan; 2721 2722 BT_DBG("%s hcon %p", hdev->name, conn); 2723 2724 if (test_bit(HCI_CONN_DROP, &conn->flags)) { 2725 BT_DBG("Refusing to create new hci_chan"); 2726 return NULL; 2727 } 2728 2729 chan = kzalloc(sizeof(*chan), GFP_KERNEL); 2730 if (!chan) 2731 return NULL; 2732 2733 chan->conn = hci_conn_get(conn); 2734 skb_queue_head_init(&chan->data_q); 2735 chan->state = BT_CONNECTED; 2736 2737 list_add_rcu(&chan->list, &conn->chan_list); 2738 2739 return chan; 2740 } 2741 2742 void hci_chan_del(struct hci_chan *chan) 2743 { 2744 struct hci_conn *conn = chan->conn; 2745 struct hci_dev *hdev = conn->hdev; 2746 2747 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan); 2748 2749 list_del_rcu(&chan->list); 2750 2751 synchronize_rcu(); 2752 2753 /* Prevent new hci_chan's to be created for this hci_conn */ 2754 set_bit(HCI_CONN_DROP, &conn->flags); 2755 2756 hci_conn_put(conn); 2757 2758 skb_queue_purge(&chan->data_q); 2759 kfree(chan); 2760 } 2761 2762 void hci_chan_list_flush(struct hci_conn *conn) 2763 { 2764 struct hci_chan *chan, *n; 2765 2766 BT_DBG("hcon %p", conn); 2767 2768 list_for_each_entry_safe(chan, n, &conn->chan_list, list) 2769 hci_chan_del(chan); 2770 } 2771 2772 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon, 2773 __u16 handle) 2774 { 2775 struct hci_chan *hchan; 2776 2777 list_for_each_entry(hchan, &hcon->chan_list, list) { 2778 if (hchan->handle == handle) 2779 return hchan; 2780 } 2781 2782 return NULL; 2783 } 2784 2785 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle) 2786 { 2787 struct hci_conn_hash *h = &hdev->conn_hash; 2788 struct hci_conn *hcon; 2789 struct hci_chan *hchan = NULL; 2790 2791 rcu_read_lock(); 2792 2793 list_for_each_entry_rcu(hcon, &h->list, list) { 2794 hchan = __hci_chan_lookup_handle(hcon, handle); 2795 if (hchan) 2796 break; 2797 } 2798 2799 rcu_read_unlock(); 2800 2801 return hchan; 2802 } 2803 2804 u32 hci_conn_get_phy(struct hci_conn *conn) 2805 { 2806 u32 phys = 0; 2807 2808 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471: 2809 * Table 6.2: Packets defined for synchronous, asynchronous, and 2810 * CPB logical transport types. 2811 */ 2812 switch (conn->type) { 2813 case SCO_LINK: 2814 /* SCO logical transport (1 Mb/s): 2815 * HV1, HV2, HV3 and DV. 2816 */ 2817 phys |= BT_PHY_BR_1M_1SLOT; 2818 2819 break; 2820 2821 case ACL_LINK: 2822 /* ACL logical transport (1 Mb/s) ptt=0: 2823 * DH1, DM3, DH3, DM5 and DH5. 2824 */ 2825 phys |= BT_PHY_BR_1M_1SLOT; 2826 2827 if (conn->pkt_type & (HCI_DM3 | HCI_DH3)) 2828 phys |= BT_PHY_BR_1M_3SLOT; 2829 2830 if (conn->pkt_type & (HCI_DM5 | HCI_DH5)) 2831 phys |= BT_PHY_BR_1M_5SLOT; 2832 2833 /* ACL logical transport (2 Mb/s) ptt=1: 2834 * 2-DH1, 2-DH3 and 2-DH5. 2835 */ 2836 if (!(conn->pkt_type & HCI_2DH1)) 2837 phys |= BT_PHY_EDR_2M_1SLOT; 2838 2839 if (!(conn->pkt_type & HCI_2DH3)) 2840 phys |= BT_PHY_EDR_2M_3SLOT; 2841 2842 if (!(conn->pkt_type & HCI_2DH5)) 2843 phys |= BT_PHY_EDR_2M_5SLOT; 2844 2845 /* ACL logical transport (3 Mb/s) ptt=1: 2846 * 3-DH1, 3-DH3 and 3-DH5. 2847 */ 2848 if (!(conn->pkt_type & HCI_3DH1)) 2849 phys |= BT_PHY_EDR_3M_1SLOT; 2850 2851 if (!(conn->pkt_type & HCI_3DH3)) 2852 phys |= BT_PHY_EDR_3M_3SLOT; 2853 2854 if (!(conn->pkt_type & HCI_3DH5)) 2855 phys |= BT_PHY_EDR_3M_5SLOT; 2856 2857 break; 2858 2859 case ESCO_LINK: 2860 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */ 2861 phys |= BT_PHY_BR_1M_1SLOT; 2862 2863 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5))) 2864 phys |= BT_PHY_BR_1M_3SLOT; 2865 2866 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */ 2867 if (!(conn->pkt_type & ESCO_2EV3)) 2868 phys |= BT_PHY_EDR_2M_1SLOT; 2869 2870 if (!(conn->pkt_type & ESCO_2EV5)) 2871 phys |= BT_PHY_EDR_2M_3SLOT; 2872 2873 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */ 2874 if (!(conn->pkt_type & ESCO_3EV3)) 2875 phys |= BT_PHY_EDR_3M_1SLOT; 2876 2877 if (!(conn->pkt_type & ESCO_3EV5)) 2878 phys |= BT_PHY_EDR_3M_3SLOT; 2879 2880 break; 2881 2882 case LE_LINK: 2883 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M) 2884 phys |= BT_PHY_LE_1M_TX; 2885 2886 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M) 2887 phys |= BT_PHY_LE_1M_RX; 2888 2889 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M) 2890 phys |= BT_PHY_LE_2M_TX; 2891 2892 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M) 2893 phys |= BT_PHY_LE_2M_RX; 2894 2895 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED) 2896 phys |= BT_PHY_LE_CODED_TX; 2897 2898 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED) 2899 phys |= BT_PHY_LE_CODED_RX; 2900 2901 break; 2902 } 2903 2904 return phys; 2905 } 2906 2907 static int abort_conn_sync(struct hci_dev *hdev, void *data) 2908 { 2909 struct hci_conn *conn; 2910 u16 handle = PTR_UINT(data); 2911 2912 conn = hci_conn_hash_lookup_handle(hdev, handle); 2913 if (!conn) 2914 return 0; 2915 2916 return hci_abort_conn_sync(hdev, conn, conn->abort_reason); 2917 } 2918 2919 int hci_abort_conn(struct hci_conn *conn, u8 reason) 2920 { 2921 struct hci_dev *hdev = conn->hdev; 2922 2923 /* If abort_reason has already been set it means the connection is 2924 * already being aborted so don't attempt to overwrite it. 2925 */ 2926 if (conn->abort_reason) 2927 return 0; 2928 2929 bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason); 2930 2931 conn->abort_reason = reason; 2932 2933 /* If the connection is pending check the command opcode since that 2934 * might be blocking on hci_cmd_sync_work while waiting its respective 2935 * event so we need to hci_cmd_sync_cancel to cancel it. 2936 * 2937 * hci_connect_le serializes the connection attempts so only one 2938 * connection can be in BT_CONNECT at time. 2939 */ 2940 if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) { 2941 switch (hci_skb_event(hdev->sent_cmd)) { 2942 case HCI_EV_LE_CONN_COMPLETE: 2943 case HCI_EV_LE_ENHANCED_CONN_COMPLETE: 2944 case HCI_EVT_LE_CIS_ESTABLISHED: 2945 hci_cmd_sync_cancel(hdev, -ECANCELED); 2946 break; 2947 } 2948 } 2949 2950 return hci_cmd_sync_queue(hdev, abort_conn_sync, UINT_PTR(conn->handle), 2951 NULL); 2952 } 2953