1 /* 2 BlueZ - Bluetooth protocol stack for Linux 3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved. 4 Copyright 2023-2024 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 #include <linux/errqueue.h> 31 32 #include <net/bluetooth/bluetooth.h> 33 #include <net/bluetooth/hci_core.h> 34 #include <net/bluetooth/l2cap.h> 35 #include <net/bluetooth/iso.h> 36 #include <net/bluetooth/mgmt.h> 37 38 #include "smp.h" 39 #include "eir.h" 40 41 struct sco_param { 42 u16 pkt_type; 43 u16 max_latency; 44 u8 retrans_effort; 45 }; 46 47 struct conn_handle_t { 48 struct hci_conn *conn; 49 __u16 handle; 50 }; 51 52 static const struct sco_param esco_param_cvsd[] = { 53 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */ 54 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */ 55 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */ 56 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */ 57 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */ 58 }; 59 60 static const struct sco_param sco_param_cvsd[] = { 61 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */ 62 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */ 63 }; 64 65 static const struct sco_param esco_param_msbc[] = { 66 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */ 67 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */ 68 }; 69 70 /* This function requires the caller holds hdev->lock */ 71 void hci_connect_le_scan_cleanup(struct hci_conn *conn, u8 status) 72 { 73 struct hci_conn_params *params; 74 struct hci_dev *hdev = conn->hdev; 75 struct smp_irk *irk; 76 bdaddr_t *bdaddr; 77 u8 bdaddr_type; 78 79 bdaddr = &conn->dst; 80 bdaddr_type = conn->dst_type; 81 82 /* Check if we need to convert to identity address */ 83 irk = hci_get_irk(hdev, bdaddr, bdaddr_type); 84 if (irk) { 85 bdaddr = &irk->bdaddr; 86 bdaddr_type = irk->addr_type; 87 } 88 89 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr, 90 bdaddr_type); 91 if (!params) 92 return; 93 94 if (params->conn) { 95 hci_conn_drop(params->conn); 96 hci_conn_put(params->conn); 97 params->conn = NULL; 98 } 99 100 if (!params->explicit_connect) 101 return; 102 103 /* If the status indicates successful cancellation of 104 * the attempt (i.e. Unknown Connection Id) there's no point of 105 * notifying failure since we'll go back to keep trying to 106 * connect. The only exception is explicit connect requests 107 * where a timeout + cancel does indicate an actual failure. 108 */ 109 if (status && status != HCI_ERROR_UNKNOWN_CONN_ID) 110 mgmt_connect_failed(hdev, conn, status); 111 112 /* The connection attempt was doing scan for new RPA, and is 113 * in scan phase. If params are not associated with any other 114 * autoconnect action, remove them completely. If they are, just unmark 115 * them as waiting for connection, by clearing explicit_connect field. 116 */ 117 params->explicit_connect = false; 118 119 hci_pend_le_list_del_init(params); 120 121 switch (params->auto_connect) { 122 case HCI_AUTO_CONN_EXPLICIT: 123 hci_conn_params_del(hdev, bdaddr, bdaddr_type); 124 /* return instead of break to avoid duplicate scan update */ 125 return; 126 case HCI_AUTO_CONN_DIRECT: 127 case HCI_AUTO_CONN_ALWAYS: 128 hci_pend_le_list_add(params, &hdev->pend_le_conns); 129 break; 130 case HCI_AUTO_CONN_REPORT: 131 hci_pend_le_list_add(params, &hdev->pend_le_reports); 132 break; 133 default: 134 break; 135 } 136 137 hci_update_passive_scan(hdev); 138 } 139 140 static void hci_conn_cleanup(struct hci_conn *conn) 141 { 142 struct hci_dev *hdev = conn->hdev; 143 144 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags)) 145 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type); 146 147 if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags)) 148 hci_remove_link_key(hdev, &conn->dst); 149 150 hci_chan_list_flush(conn); 151 152 if (HCI_CONN_HANDLE_UNSET(conn->handle)) 153 ida_free(&hdev->unset_handle_ida, conn->handle); 154 155 if (conn->cleanup) 156 conn->cleanup(conn); 157 158 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) { 159 switch (conn->setting & SCO_AIRMODE_MASK) { 160 case SCO_AIRMODE_CVSD: 161 case SCO_AIRMODE_TRANSP: 162 if (hdev->notify) 163 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO); 164 break; 165 } 166 } else { 167 if (hdev->notify) 168 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL); 169 } 170 171 debugfs_remove_recursive(conn->debugfs); 172 173 hci_conn_del_sysfs(conn); 174 175 hci_dev_put(hdev); 176 } 177 178 int hci_disconnect(struct hci_conn *conn, __u8 reason) 179 { 180 BT_DBG("hcon %p", conn); 181 182 /* When we are central of an established connection and it enters 183 * the disconnect timeout, then go ahead and try to read the 184 * current clock offset. Processing of the result is done 185 * within the event handling and hci_clock_offset_evt function. 186 */ 187 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER && 188 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) { 189 struct hci_dev *hdev = conn->hdev; 190 struct hci_cp_read_clock_offset clkoff_cp; 191 192 clkoff_cp.handle = cpu_to_le16(conn->handle); 193 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp), 194 &clkoff_cp); 195 } 196 197 return hci_abort_conn(conn, reason); 198 } 199 200 static void hci_add_sco(struct hci_conn *conn, __u16 handle) 201 { 202 struct hci_dev *hdev = conn->hdev; 203 struct hci_cp_add_sco cp; 204 205 BT_DBG("hcon %p", conn); 206 207 conn->state = BT_CONNECT; 208 conn->out = true; 209 210 conn->attempt++; 211 212 cp.handle = cpu_to_le16(handle); 213 cp.pkt_type = cpu_to_le16(conn->pkt_type); 214 215 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp); 216 } 217 218 static bool find_next_esco_param(struct hci_conn *conn, 219 const struct sco_param *esco_param, int size) 220 { 221 if (!conn->parent) 222 return false; 223 224 for (; conn->attempt <= size; conn->attempt++) { 225 if (lmp_esco_2m_capable(conn->parent) || 226 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3)) 227 break; 228 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported", 229 conn, conn->attempt); 230 } 231 232 return conn->attempt <= size; 233 } 234 235 static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec) 236 { 237 int err; 238 __u8 vnd_len, *vnd_data = NULL; 239 struct hci_op_configure_data_path *cmd = NULL; 240 241 /* Do not take below 2 checks as error since the 1st means user do not 242 * want to use HFP offload mode and the 2nd means the vendor controller 243 * do not need to send below HCI command for offload mode. 244 */ 245 if (!codec->data_path || !hdev->get_codec_config_data) 246 return 0; 247 248 err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len, 249 &vnd_data); 250 if (err < 0) 251 goto error; 252 253 cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL); 254 if (!cmd) { 255 err = -ENOMEM; 256 goto error; 257 } 258 259 err = hdev->get_data_path_id(hdev, &cmd->data_path_id); 260 if (err < 0) 261 goto error; 262 263 cmd->vnd_len = vnd_len; 264 memcpy(cmd->vnd_data, vnd_data, vnd_len); 265 266 cmd->direction = 0x00; 267 __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH, 268 sizeof(*cmd) + vnd_len, cmd, HCI_CMD_TIMEOUT); 269 270 cmd->direction = 0x01; 271 err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH, 272 sizeof(*cmd) + vnd_len, cmd, 273 HCI_CMD_TIMEOUT); 274 error: 275 276 kfree(cmd); 277 kfree(vnd_data); 278 return err; 279 } 280 281 static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data) 282 { 283 struct conn_handle_t *conn_handle = data; 284 struct hci_conn *conn = conn_handle->conn; 285 __u16 handle = conn_handle->handle; 286 struct hci_cp_enhanced_setup_sync_conn cp; 287 const struct sco_param *param; 288 289 kfree(conn_handle); 290 291 if (!hci_conn_valid(hdev, conn)) 292 return -ECANCELED; 293 294 bt_dev_dbg(hdev, "hcon %p", conn); 295 296 configure_datapath_sync(hdev, &conn->codec); 297 298 conn->state = BT_CONNECT; 299 conn->out = true; 300 301 conn->attempt++; 302 303 memset(&cp, 0x00, sizeof(cp)); 304 305 cp.handle = cpu_to_le16(handle); 306 307 cp.tx_bandwidth = cpu_to_le32(0x00001f40); 308 cp.rx_bandwidth = cpu_to_le32(0x00001f40); 309 310 switch (conn->codec.id) { 311 case BT_CODEC_MSBC: 312 if (!find_next_esco_param(conn, esco_param_msbc, 313 ARRAY_SIZE(esco_param_msbc))) 314 return -EINVAL; 315 316 param = &esco_param_msbc[conn->attempt - 1]; 317 cp.tx_coding_format.id = 0x05; 318 cp.rx_coding_format.id = 0x05; 319 cp.tx_codec_frame_size = __cpu_to_le16(60); 320 cp.rx_codec_frame_size = __cpu_to_le16(60); 321 cp.in_bandwidth = __cpu_to_le32(32000); 322 cp.out_bandwidth = __cpu_to_le32(32000); 323 cp.in_coding_format.id = 0x04; 324 cp.out_coding_format.id = 0x04; 325 cp.in_coded_data_size = __cpu_to_le16(16); 326 cp.out_coded_data_size = __cpu_to_le16(16); 327 cp.in_pcm_data_format = 2; 328 cp.out_pcm_data_format = 2; 329 cp.in_pcm_sample_payload_msb_pos = 0; 330 cp.out_pcm_sample_payload_msb_pos = 0; 331 cp.in_data_path = conn->codec.data_path; 332 cp.out_data_path = conn->codec.data_path; 333 cp.in_transport_unit_size = 1; 334 cp.out_transport_unit_size = 1; 335 break; 336 337 case BT_CODEC_TRANSPARENT: 338 if (!find_next_esco_param(conn, esco_param_msbc, 339 ARRAY_SIZE(esco_param_msbc))) 340 return -EINVAL; 341 342 param = &esco_param_msbc[conn->attempt - 1]; 343 cp.tx_coding_format.id = 0x03; 344 cp.rx_coding_format.id = 0x03; 345 cp.tx_codec_frame_size = __cpu_to_le16(60); 346 cp.rx_codec_frame_size = __cpu_to_le16(60); 347 cp.in_bandwidth = __cpu_to_le32(0x1f40); 348 cp.out_bandwidth = __cpu_to_le32(0x1f40); 349 cp.in_coding_format.id = 0x03; 350 cp.out_coding_format.id = 0x03; 351 cp.in_coded_data_size = __cpu_to_le16(16); 352 cp.out_coded_data_size = __cpu_to_le16(16); 353 cp.in_pcm_data_format = 2; 354 cp.out_pcm_data_format = 2; 355 cp.in_pcm_sample_payload_msb_pos = 0; 356 cp.out_pcm_sample_payload_msb_pos = 0; 357 cp.in_data_path = conn->codec.data_path; 358 cp.out_data_path = conn->codec.data_path; 359 cp.in_transport_unit_size = 1; 360 cp.out_transport_unit_size = 1; 361 break; 362 363 case BT_CODEC_CVSD: 364 if (conn->parent && lmp_esco_capable(conn->parent)) { 365 if (!find_next_esco_param(conn, esco_param_cvsd, 366 ARRAY_SIZE(esco_param_cvsd))) 367 return -EINVAL; 368 param = &esco_param_cvsd[conn->attempt - 1]; 369 } else { 370 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd)) 371 return -EINVAL; 372 param = &sco_param_cvsd[conn->attempt - 1]; 373 } 374 cp.tx_coding_format.id = 2; 375 cp.rx_coding_format.id = 2; 376 cp.tx_codec_frame_size = __cpu_to_le16(60); 377 cp.rx_codec_frame_size = __cpu_to_le16(60); 378 cp.in_bandwidth = __cpu_to_le32(16000); 379 cp.out_bandwidth = __cpu_to_le32(16000); 380 cp.in_coding_format.id = 4; 381 cp.out_coding_format.id = 4; 382 cp.in_coded_data_size = __cpu_to_le16(16); 383 cp.out_coded_data_size = __cpu_to_le16(16); 384 cp.in_pcm_data_format = 2; 385 cp.out_pcm_data_format = 2; 386 cp.in_pcm_sample_payload_msb_pos = 0; 387 cp.out_pcm_sample_payload_msb_pos = 0; 388 cp.in_data_path = conn->codec.data_path; 389 cp.out_data_path = conn->codec.data_path; 390 cp.in_transport_unit_size = 16; 391 cp.out_transport_unit_size = 16; 392 break; 393 default: 394 return -EINVAL; 395 } 396 397 cp.retrans_effort = param->retrans_effort; 398 cp.pkt_type = __cpu_to_le16(param->pkt_type); 399 cp.max_latency = __cpu_to_le16(param->max_latency); 400 401 if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0) 402 return -EIO; 403 404 return 0; 405 } 406 407 static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle) 408 { 409 struct hci_dev *hdev = conn->hdev; 410 struct hci_cp_setup_sync_conn cp; 411 const struct sco_param *param; 412 413 bt_dev_dbg(hdev, "hcon %p", conn); 414 415 conn->state = BT_CONNECT; 416 conn->out = true; 417 418 conn->attempt++; 419 420 cp.handle = cpu_to_le16(handle); 421 422 cp.tx_bandwidth = cpu_to_le32(0x00001f40); 423 cp.rx_bandwidth = cpu_to_le32(0x00001f40); 424 cp.voice_setting = cpu_to_le16(conn->setting); 425 426 switch (conn->setting & SCO_AIRMODE_MASK) { 427 case SCO_AIRMODE_TRANSP: 428 if (!find_next_esco_param(conn, esco_param_msbc, 429 ARRAY_SIZE(esco_param_msbc))) 430 return false; 431 param = &esco_param_msbc[conn->attempt - 1]; 432 break; 433 case SCO_AIRMODE_CVSD: 434 if (conn->parent && lmp_esco_capable(conn->parent)) { 435 if (!find_next_esco_param(conn, esco_param_cvsd, 436 ARRAY_SIZE(esco_param_cvsd))) 437 return false; 438 param = &esco_param_cvsd[conn->attempt - 1]; 439 } else { 440 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd)) 441 return false; 442 param = &sco_param_cvsd[conn->attempt - 1]; 443 } 444 break; 445 default: 446 return false; 447 } 448 449 cp.retrans_effort = param->retrans_effort; 450 cp.pkt_type = __cpu_to_le16(param->pkt_type); 451 cp.max_latency = __cpu_to_le16(param->max_latency); 452 453 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0) 454 return false; 455 456 return true; 457 } 458 459 bool hci_setup_sync(struct hci_conn *conn, __u16 handle) 460 { 461 int result; 462 struct conn_handle_t *conn_handle; 463 464 if (enhanced_sync_conn_capable(conn->hdev)) { 465 conn_handle = kzalloc(sizeof(*conn_handle), GFP_KERNEL); 466 467 if (!conn_handle) 468 return false; 469 470 conn_handle->conn = conn; 471 conn_handle->handle = handle; 472 result = hci_cmd_sync_queue(conn->hdev, hci_enhanced_setup_sync, 473 conn_handle, NULL); 474 if (result < 0) 475 kfree(conn_handle); 476 477 return result == 0; 478 } 479 480 return hci_setup_sync_conn(conn, handle); 481 } 482 483 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency, 484 u16 to_multiplier) 485 { 486 struct hci_dev *hdev = conn->hdev; 487 struct hci_conn_params *params; 488 struct hci_cp_le_conn_update cp; 489 490 hci_dev_lock(hdev); 491 492 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type); 493 if (params) { 494 params->conn_min_interval = min; 495 params->conn_max_interval = max; 496 params->conn_latency = latency; 497 params->supervision_timeout = to_multiplier; 498 } 499 500 hci_dev_unlock(hdev); 501 502 memset(&cp, 0, sizeof(cp)); 503 cp.handle = cpu_to_le16(conn->handle); 504 cp.conn_interval_min = cpu_to_le16(min); 505 cp.conn_interval_max = cpu_to_le16(max); 506 cp.conn_latency = cpu_to_le16(latency); 507 cp.supervision_timeout = cpu_to_le16(to_multiplier); 508 cp.min_ce_len = cpu_to_le16(0x0000); 509 cp.max_ce_len = cpu_to_le16(0x0000); 510 511 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp); 512 513 if (params) 514 return 0x01; 515 516 return 0x00; 517 } 518 519 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand, 520 __u8 ltk[16], __u8 key_size) 521 { 522 struct hci_dev *hdev = conn->hdev; 523 struct hci_cp_le_start_enc cp; 524 525 BT_DBG("hcon %p", conn); 526 527 memset(&cp, 0, sizeof(cp)); 528 529 cp.handle = cpu_to_le16(conn->handle); 530 cp.rand = rand; 531 cp.ediv = ediv; 532 memcpy(cp.ltk, ltk, key_size); 533 534 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp); 535 } 536 537 /* Device _must_ be locked */ 538 void hci_sco_setup(struct hci_conn *conn, __u8 status) 539 { 540 struct hci_link *link; 541 542 link = list_first_entry_or_null(&conn->link_list, struct hci_link, list); 543 if (!link || !link->conn) 544 return; 545 546 BT_DBG("hcon %p", conn); 547 548 if (!status) { 549 if (lmp_esco_capable(conn->hdev)) 550 hci_setup_sync(link->conn, conn->handle); 551 else 552 hci_add_sco(link->conn, conn->handle); 553 } else { 554 hci_connect_cfm(link->conn, status); 555 hci_conn_del(link->conn); 556 } 557 } 558 559 static void hci_conn_timeout(struct work_struct *work) 560 { 561 struct hci_conn *conn = container_of(work, struct hci_conn, 562 disc_work.work); 563 int refcnt = atomic_read(&conn->refcnt); 564 565 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state)); 566 567 WARN_ON(refcnt < 0); 568 569 /* FIXME: It was observed that in pairing failed scenario, refcnt 570 * drops below 0. Probably this is because l2cap_conn_del calls 571 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is 572 * dropped. After that loop hci_chan_del is called which also drops 573 * conn. For now make sure that ACL is alive if refcnt is higher then 0, 574 * otherwise drop it. 575 */ 576 if (refcnt > 0) 577 return; 578 579 hci_abort_conn(conn, hci_proto_disconn_ind(conn)); 580 } 581 582 /* Enter sniff mode */ 583 static void hci_conn_idle(struct work_struct *work) 584 { 585 struct hci_conn *conn = container_of(work, struct hci_conn, 586 idle_work.work); 587 struct hci_dev *hdev = conn->hdev; 588 589 BT_DBG("hcon %p mode %d", conn, conn->mode); 590 591 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn)) 592 return; 593 594 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF)) 595 return; 596 597 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) { 598 struct hci_cp_sniff_subrate cp; 599 cp.handle = cpu_to_le16(conn->handle); 600 cp.max_latency = cpu_to_le16(0); 601 cp.min_remote_timeout = cpu_to_le16(0); 602 cp.min_local_timeout = cpu_to_le16(0); 603 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp); 604 } 605 606 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { 607 struct hci_cp_sniff_mode cp; 608 cp.handle = cpu_to_le16(conn->handle); 609 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval); 610 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval); 611 cp.attempt = cpu_to_le16(4); 612 cp.timeout = cpu_to_le16(1); 613 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp); 614 } 615 } 616 617 static void hci_conn_auto_accept(struct work_struct *work) 618 { 619 struct hci_conn *conn = container_of(work, struct hci_conn, 620 auto_accept_work.work); 621 622 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst), 623 &conn->dst); 624 } 625 626 static void le_disable_advertising(struct hci_dev *hdev) 627 { 628 if (ext_adv_capable(hdev)) { 629 struct hci_cp_le_set_ext_adv_enable cp; 630 631 cp.enable = 0x00; 632 cp.num_of_sets = 0x00; 633 634 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp), 635 &cp); 636 } else { 637 u8 enable = 0x00; 638 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), 639 &enable); 640 } 641 } 642 643 static void le_conn_timeout(struct work_struct *work) 644 { 645 struct hci_conn *conn = container_of(work, struct hci_conn, 646 le_conn_timeout.work); 647 struct hci_dev *hdev = conn->hdev; 648 649 BT_DBG(""); 650 651 /* We could end up here due to having done directed advertising, 652 * so clean up the state if necessary. This should however only 653 * happen with broken hardware or if low duty cycle was used 654 * (which doesn't have a timeout of its own). 655 */ 656 if (conn->role == HCI_ROLE_SLAVE) { 657 /* Disable LE Advertising */ 658 le_disable_advertising(hdev); 659 hci_dev_lock(hdev); 660 hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT); 661 hci_dev_unlock(hdev); 662 return; 663 } 664 665 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM); 666 } 667 668 struct iso_list_data { 669 union { 670 u8 cig; 671 u8 big; 672 }; 673 union { 674 u8 cis; 675 u8 bis; 676 u16 sync_handle; 677 }; 678 int count; 679 bool big_term; 680 bool pa_sync_term; 681 bool big_sync_term; 682 }; 683 684 static void bis_list(struct hci_conn *conn, void *data) 685 { 686 struct iso_list_data *d = data; 687 688 /* Skip if not broadcast/ANY address */ 689 if (bacmp(&conn->dst, BDADDR_ANY)) 690 return; 691 692 if (d->big != conn->iso_qos.bcast.big || d->bis == BT_ISO_QOS_BIS_UNSET || 693 d->bis != conn->iso_qos.bcast.bis) 694 return; 695 696 d->count++; 697 } 698 699 static int terminate_big_sync(struct hci_dev *hdev, void *data) 700 { 701 struct iso_list_data *d = data; 702 703 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis); 704 705 hci_disable_per_advertising_sync(hdev, d->bis); 706 hci_remove_ext_adv_instance_sync(hdev, d->bis, NULL); 707 708 /* Only terminate BIG if it has been created */ 709 if (!d->big_term) 710 return 0; 711 712 return hci_le_terminate_big_sync(hdev, d->big, 713 HCI_ERROR_LOCAL_HOST_TERM); 714 } 715 716 static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err) 717 { 718 kfree(data); 719 } 720 721 static int hci_le_terminate_big(struct hci_dev *hdev, struct hci_conn *conn) 722 { 723 struct iso_list_data *d; 724 int ret; 725 726 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", conn->iso_qos.bcast.big, 727 conn->iso_qos.bcast.bis); 728 729 d = kzalloc(sizeof(*d), GFP_KERNEL); 730 if (!d) 731 return -ENOMEM; 732 733 d->big = conn->iso_qos.bcast.big; 734 d->bis = conn->iso_qos.bcast.bis; 735 d->big_term = test_and_clear_bit(HCI_CONN_BIG_CREATED, &conn->flags); 736 737 ret = hci_cmd_sync_queue(hdev, terminate_big_sync, d, 738 terminate_big_destroy); 739 if (ret) 740 kfree(d); 741 742 return ret; 743 } 744 745 static int big_terminate_sync(struct hci_dev *hdev, void *data) 746 { 747 struct iso_list_data *d = data; 748 749 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big, 750 d->sync_handle); 751 752 if (d->big_sync_term) 753 hci_le_big_terminate_sync(hdev, d->big); 754 755 if (d->pa_sync_term) 756 return hci_le_pa_terminate_sync(hdev, d->sync_handle); 757 758 return 0; 759 } 760 761 static void find_bis(struct hci_conn *conn, void *data) 762 { 763 struct iso_list_data *d = data; 764 765 /* Ignore if BIG doesn't match */ 766 if (d->big != conn->iso_qos.bcast.big) 767 return; 768 769 d->count++; 770 } 771 772 static int hci_le_big_terminate(struct hci_dev *hdev, struct hci_conn *conn) 773 { 774 struct iso_list_data *d; 775 int ret; 776 777 bt_dev_dbg(hdev, "hcon %p big 0x%2.2x sync_handle 0x%4.4x", conn, 778 conn->iso_qos.bcast.big, conn->sync_handle); 779 780 d = kzalloc(sizeof(*d), GFP_KERNEL); 781 if (!d) 782 return -ENOMEM; 783 784 d->big = conn->iso_qos.bcast.big; 785 d->sync_handle = conn->sync_handle; 786 787 if (conn->type == PA_LINK && 788 test_and_clear_bit(HCI_CONN_PA_SYNC, &conn->flags)) { 789 hci_conn_hash_list_flag(hdev, find_bis, PA_LINK, 790 HCI_CONN_PA_SYNC, d); 791 792 if (!d->count) 793 d->pa_sync_term = true; 794 795 d->count = 0; 796 } 797 798 if (test_and_clear_bit(HCI_CONN_BIG_SYNC, &conn->flags)) { 799 hci_conn_hash_list_flag(hdev, find_bis, BIS_LINK, 800 HCI_CONN_BIG_SYNC, d); 801 802 if (!d->count) 803 d->big_sync_term = true; 804 } 805 806 if (!d->pa_sync_term && !d->big_sync_term) 807 return 0; 808 809 ret = hci_cmd_sync_queue(hdev, big_terminate_sync, d, 810 terminate_big_destroy); 811 if (ret) 812 kfree(d); 813 814 return ret; 815 } 816 817 /* Cleanup BIS connection 818 * 819 * Detects if there any BIS left connected in a BIG 820 * broadcaster: Remove advertising instance and terminate BIG. 821 * broadcaster receiver: Terminate BIG sync and terminate PA sync. 822 */ 823 static void bis_cleanup(struct hci_conn *conn) 824 { 825 struct hci_dev *hdev = conn->hdev; 826 struct hci_conn *bis; 827 828 bt_dev_dbg(hdev, "conn %p", conn); 829 830 if (conn->role == HCI_ROLE_MASTER) { 831 if (!test_and_clear_bit(HCI_CONN_PER_ADV, &conn->flags)) 832 return; 833 834 /* Check if ISO connection is a BIS and terminate advertising 835 * set and BIG if there are no other connections using it. 836 */ 837 bis = hci_conn_hash_lookup_big_state(hdev, 838 conn->iso_qos.bcast.big, 839 BT_CONNECTED, 840 HCI_ROLE_MASTER); 841 if (bis) 842 return; 843 844 bis = hci_conn_hash_lookup_big_state(hdev, 845 conn->iso_qos.bcast.big, 846 BT_CONNECT, 847 HCI_ROLE_MASTER); 848 if (bis) 849 return; 850 851 bis = hci_conn_hash_lookup_big_state(hdev, 852 conn->iso_qos.bcast.big, 853 BT_OPEN, 854 HCI_ROLE_MASTER); 855 if (bis) 856 return; 857 858 hci_le_terminate_big(hdev, conn); 859 } else { 860 hci_le_big_terminate(hdev, conn); 861 } 862 } 863 864 static int remove_cig_sync(struct hci_dev *hdev, void *data) 865 { 866 u8 handle = PTR_UINT(data); 867 868 return hci_le_remove_cig_sync(hdev, handle); 869 } 870 871 static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle) 872 { 873 bt_dev_dbg(hdev, "handle 0x%2.2x", handle); 874 875 return hci_cmd_sync_queue(hdev, remove_cig_sync, UINT_PTR(handle), 876 NULL); 877 } 878 879 static void find_cis(struct hci_conn *conn, void *data) 880 { 881 struct iso_list_data *d = data; 882 883 /* Ignore broadcast or if CIG don't match */ 884 if (!bacmp(&conn->dst, BDADDR_ANY) || d->cig != conn->iso_qos.ucast.cig) 885 return; 886 887 d->count++; 888 } 889 890 /* Cleanup CIS connection: 891 * 892 * Detects if there any CIS left connected in a CIG and remove it. 893 */ 894 static void cis_cleanup(struct hci_conn *conn) 895 { 896 struct hci_dev *hdev = conn->hdev; 897 struct iso_list_data d; 898 899 if (conn->iso_qos.ucast.cig == BT_ISO_QOS_CIG_UNSET) 900 return; 901 902 memset(&d, 0, sizeof(d)); 903 d.cig = conn->iso_qos.ucast.cig; 904 905 /* Check if ISO connection is a CIS and remove CIG if there are 906 * no other connections using it. 907 */ 908 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_BOUND, &d); 909 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_CONNECT, 910 &d); 911 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_CONNECTED, 912 &d); 913 if (d.count) 914 return; 915 916 hci_le_remove_cig(hdev, conn->iso_qos.ucast.cig); 917 } 918 919 static int hci_conn_hash_alloc_unset(struct hci_dev *hdev) 920 { 921 return ida_alloc_range(&hdev->unset_handle_ida, HCI_CONN_HANDLE_MAX + 1, 922 U16_MAX, GFP_ATOMIC); 923 } 924 925 static struct hci_conn *__hci_conn_add(struct hci_dev *hdev, int type, 926 bdaddr_t *dst, u8 dst_type, 927 u8 role, u16 handle) 928 { 929 struct hci_conn *conn; 930 struct smp_irk *irk = NULL; 931 932 switch (type) { 933 case ACL_LINK: 934 if (!hdev->acl_mtu) 935 return ERR_PTR(-ECONNREFUSED); 936 break; 937 case CIS_LINK: 938 case BIS_LINK: 939 case PA_LINK: 940 if (!hdev->iso_mtu) 941 return ERR_PTR(-ECONNREFUSED); 942 irk = hci_get_irk(hdev, dst, dst_type); 943 break; 944 case LE_LINK: 945 if (hdev->le_mtu && hdev->le_mtu < HCI_MIN_LE_MTU) 946 return ERR_PTR(-ECONNREFUSED); 947 if (!hdev->le_mtu && hdev->acl_mtu < HCI_MIN_LE_MTU) 948 return ERR_PTR(-ECONNREFUSED); 949 irk = hci_get_irk(hdev, dst, dst_type); 950 break; 951 case SCO_LINK: 952 case ESCO_LINK: 953 if (!hdev->sco_pkts) 954 /* Controller does not support SCO or eSCO over HCI */ 955 return ERR_PTR(-ECONNREFUSED); 956 break; 957 default: 958 return ERR_PTR(-ECONNREFUSED); 959 } 960 961 bt_dev_dbg(hdev, "dst %pMR handle 0x%4.4x", dst, handle); 962 963 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 964 if (!conn) 965 return ERR_PTR(-ENOMEM); 966 967 /* If and IRK exists use its identity address */ 968 if (!irk) { 969 bacpy(&conn->dst, dst); 970 conn->dst_type = dst_type; 971 } else { 972 bacpy(&conn->dst, &irk->bdaddr); 973 conn->dst_type = irk->addr_type; 974 } 975 976 bacpy(&conn->src, &hdev->bdaddr); 977 conn->handle = handle; 978 conn->hdev = hdev; 979 conn->type = type; 980 conn->role = role; 981 conn->mode = HCI_CM_ACTIVE; 982 conn->state = BT_OPEN; 983 conn->auth_type = HCI_AT_GENERAL_BONDING; 984 conn->io_capability = hdev->io_capability; 985 conn->remote_auth = 0xff; 986 conn->key_type = 0xff; 987 conn->rssi = HCI_RSSI_INVALID; 988 conn->tx_power = HCI_TX_POWER_INVALID; 989 conn->max_tx_power = HCI_TX_POWER_INVALID; 990 conn->sync_handle = HCI_SYNC_HANDLE_INVALID; 991 conn->sid = HCI_SID_INVALID; 992 993 set_bit(HCI_CONN_POWER_SAVE, &conn->flags); 994 conn->disc_timeout = HCI_DISCONN_TIMEOUT; 995 996 /* Set Default Authenticated payload timeout to 30s */ 997 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT; 998 999 if (conn->role == HCI_ROLE_MASTER) 1000 conn->out = true; 1001 1002 switch (type) { 1003 case ACL_LINK: 1004 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK; 1005 conn->mtu = hdev->acl_mtu; 1006 break; 1007 case LE_LINK: 1008 /* conn->src should reflect the local identity address */ 1009 hci_copy_identity_address(hdev, &conn->src, &conn->src_type); 1010 conn->mtu = hdev->le_mtu ? hdev->le_mtu : hdev->acl_mtu; 1011 break; 1012 case CIS_LINK: 1013 /* conn->src should reflect the local identity address */ 1014 hci_copy_identity_address(hdev, &conn->src, &conn->src_type); 1015 1016 if (conn->role == HCI_ROLE_MASTER) 1017 conn->cleanup = cis_cleanup; 1018 1019 conn->mtu = hdev->iso_mtu; 1020 break; 1021 case PA_LINK: 1022 case BIS_LINK: 1023 /* conn->src should reflect the local identity address */ 1024 hci_copy_identity_address(hdev, &conn->src, &conn->src_type); 1025 conn->cleanup = bis_cleanup; 1026 conn->mtu = hdev->iso_mtu; 1027 break; 1028 case SCO_LINK: 1029 if (lmp_esco_capable(hdev)) 1030 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) | 1031 (hdev->esco_type & EDR_ESCO_MASK); 1032 else 1033 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK; 1034 1035 conn->mtu = hdev->sco_mtu; 1036 break; 1037 case ESCO_LINK: 1038 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK; 1039 conn->mtu = hdev->sco_mtu; 1040 break; 1041 } 1042 1043 skb_queue_head_init(&conn->data_q); 1044 skb_queue_head_init(&conn->tx_q.queue); 1045 1046 INIT_LIST_HEAD(&conn->chan_list); 1047 INIT_LIST_HEAD(&conn->link_list); 1048 1049 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout); 1050 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept); 1051 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle); 1052 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout); 1053 1054 atomic_set(&conn->refcnt, 0); 1055 1056 hci_dev_hold(hdev); 1057 1058 hci_conn_hash_add(hdev, conn); 1059 1060 /* The SCO and eSCO connections will only be notified when their 1061 * setup has been completed. This is different to ACL links which 1062 * can be notified right away. 1063 */ 1064 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) { 1065 if (hdev->notify) 1066 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD); 1067 } 1068 1069 hci_conn_init_sysfs(conn); 1070 return conn; 1071 } 1072 1073 struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type, 1074 bdaddr_t *dst, u8 dst_type, u8 role) 1075 { 1076 int handle; 1077 1078 bt_dev_dbg(hdev, "dst %pMR", dst); 1079 1080 handle = hci_conn_hash_alloc_unset(hdev); 1081 if (unlikely(handle < 0)) 1082 return ERR_PTR(-ECONNREFUSED); 1083 1084 return __hci_conn_add(hdev, type, dst, dst_type, role, handle); 1085 } 1086 1087 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst, 1088 u8 dst_type, u8 role, u16 handle) 1089 { 1090 if (handle > HCI_CONN_HANDLE_MAX) 1091 return ERR_PTR(-EINVAL); 1092 1093 return __hci_conn_add(hdev, type, dst, dst_type, role, handle); 1094 } 1095 1096 static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason) 1097 { 1098 if (!reason) 1099 reason = HCI_ERROR_REMOTE_USER_TERM; 1100 1101 /* Due to race, SCO/ISO conn might be not established yet at this point, 1102 * and nothing else will clean it up. In other cases it is done via HCI 1103 * events. 1104 */ 1105 switch (conn->type) { 1106 case SCO_LINK: 1107 case ESCO_LINK: 1108 if (HCI_CONN_HANDLE_UNSET(conn->handle)) 1109 hci_conn_failed(conn, reason); 1110 break; 1111 case CIS_LINK: 1112 case BIS_LINK: 1113 case PA_LINK: 1114 if ((conn->state != BT_CONNECTED && 1115 !test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) || 1116 test_bit(HCI_CONN_BIG_CREATED, &conn->flags)) 1117 hci_conn_failed(conn, reason); 1118 break; 1119 } 1120 } 1121 1122 static void hci_conn_unlink(struct hci_conn *conn) 1123 { 1124 struct hci_dev *hdev = conn->hdev; 1125 1126 bt_dev_dbg(hdev, "hcon %p", conn); 1127 1128 if (!conn->parent) { 1129 struct hci_link *link, *t; 1130 1131 list_for_each_entry_safe(link, t, &conn->link_list, list) { 1132 struct hci_conn *child = link->conn; 1133 1134 hci_conn_unlink(child); 1135 1136 /* If hdev is down it means 1137 * hci_dev_close_sync/hci_conn_hash_flush is in progress 1138 * and links don't need to be cleanup as all connections 1139 * would be cleanup. 1140 */ 1141 if (!test_bit(HCI_UP, &hdev->flags)) 1142 continue; 1143 1144 hci_conn_cleanup_child(child, conn->abort_reason); 1145 } 1146 1147 return; 1148 } 1149 1150 if (!conn->link) 1151 return; 1152 1153 list_del_rcu(&conn->link->list); 1154 synchronize_rcu(); 1155 1156 hci_conn_drop(conn->parent); 1157 hci_conn_put(conn->parent); 1158 conn->parent = NULL; 1159 1160 kfree(conn->link); 1161 conn->link = NULL; 1162 } 1163 1164 void hci_conn_del(struct hci_conn *conn) 1165 { 1166 struct hci_dev *hdev = conn->hdev; 1167 1168 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle); 1169 1170 hci_conn_unlink(conn); 1171 1172 disable_delayed_work_sync(&conn->disc_work); 1173 disable_delayed_work_sync(&conn->auto_accept_work); 1174 disable_delayed_work_sync(&conn->idle_work); 1175 1176 /* Remove the connection from the list so unacked logic can detect when 1177 * a certain pool is not being utilized. 1178 */ 1179 hci_conn_hash_del(hdev, conn); 1180 1181 /* Handle unacked frames: 1182 * 1183 * - In case there are no connection, or if restoring the buffers 1184 * considered in transist would overflow, restore all buffers to the 1185 * pool. 1186 * - Otherwise restore just the buffers considered in transit for the 1187 * hci_conn 1188 */ 1189 switch (conn->type) { 1190 case ACL_LINK: 1191 if (!hci_conn_num(hdev, ACL_LINK) || 1192 hdev->acl_cnt + conn->sent > hdev->acl_pkts) 1193 hdev->acl_cnt = hdev->acl_pkts; 1194 else 1195 hdev->acl_cnt += conn->sent; 1196 break; 1197 case LE_LINK: 1198 cancel_delayed_work(&conn->le_conn_timeout); 1199 1200 if (hdev->le_pkts) { 1201 if (!hci_conn_num(hdev, LE_LINK) || 1202 hdev->le_cnt + conn->sent > hdev->le_pkts) 1203 hdev->le_cnt = hdev->le_pkts; 1204 else 1205 hdev->le_cnt += conn->sent; 1206 } else { 1207 if ((!hci_conn_num(hdev, LE_LINK) && 1208 !hci_conn_num(hdev, ACL_LINK)) || 1209 hdev->acl_cnt + conn->sent > hdev->acl_pkts) 1210 hdev->acl_cnt = hdev->acl_pkts; 1211 else 1212 hdev->acl_cnt += conn->sent; 1213 } 1214 break; 1215 case CIS_LINK: 1216 case BIS_LINK: 1217 case PA_LINK: 1218 if (!hci_iso_count(hdev) || 1219 hdev->iso_cnt + conn->sent > hdev->iso_pkts) 1220 hdev->iso_cnt = hdev->iso_pkts; 1221 else 1222 hdev->iso_cnt += conn->sent; 1223 break; 1224 } 1225 1226 skb_queue_purge(&conn->data_q); 1227 skb_queue_purge(&conn->tx_q.queue); 1228 1229 /* Remove the connection from the list and cleanup its remaining 1230 * state. This is a separate function since for some cases like 1231 * BT_CONNECT_SCAN we *only* want the cleanup part without the 1232 * rest of hci_conn_del. 1233 */ 1234 hci_conn_cleanup(conn); 1235 1236 /* Dequeue callbacks using connection pointer as data */ 1237 hci_cmd_sync_dequeue(hdev, NULL, conn, NULL); 1238 } 1239 1240 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type) 1241 { 1242 int use_src = bacmp(src, BDADDR_ANY); 1243 struct hci_dev *hdev = NULL, *d; 1244 1245 BT_DBG("%pMR -> %pMR", src, dst); 1246 1247 read_lock(&hci_dev_list_lock); 1248 1249 list_for_each_entry(d, &hci_dev_list, list) { 1250 if (!test_bit(HCI_UP, &d->flags) || 1251 hci_dev_test_flag(d, HCI_USER_CHANNEL)) 1252 continue; 1253 1254 /* Simple routing: 1255 * No source address - find interface with bdaddr != dst 1256 * Source address - find interface with bdaddr == src 1257 */ 1258 1259 if (use_src) { 1260 bdaddr_t id_addr; 1261 u8 id_addr_type; 1262 1263 if (src_type == BDADDR_BREDR) { 1264 if (!lmp_bredr_capable(d)) 1265 continue; 1266 bacpy(&id_addr, &d->bdaddr); 1267 id_addr_type = BDADDR_BREDR; 1268 } else { 1269 if (!lmp_le_capable(d)) 1270 continue; 1271 1272 hci_copy_identity_address(d, &id_addr, 1273 &id_addr_type); 1274 1275 /* Convert from HCI to three-value type */ 1276 if (id_addr_type == ADDR_LE_DEV_PUBLIC) 1277 id_addr_type = BDADDR_LE_PUBLIC; 1278 else 1279 id_addr_type = BDADDR_LE_RANDOM; 1280 } 1281 1282 if (!bacmp(&id_addr, src) && id_addr_type == src_type) { 1283 hdev = d; break; 1284 } 1285 } else { 1286 if (bacmp(&d->bdaddr, dst)) { 1287 hdev = d; break; 1288 } 1289 } 1290 } 1291 1292 if (hdev) 1293 hdev = hci_dev_hold(hdev); 1294 1295 read_unlock(&hci_dev_list_lock); 1296 return hdev; 1297 } 1298 EXPORT_SYMBOL(hci_get_route); 1299 1300 /* This function requires the caller holds hdev->lock */ 1301 static void hci_le_conn_failed(struct hci_conn *conn, u8 status) 1302 { 1303 struct hci_dev *hdev = conn->hdev; 1304 1305 hci_connect_le_scan_cleanup(conn, status); 1306 1307 /* Enable advertising in case this was a failed connection 1308 * attempt as a peripheral. 1309 */ 1310 hci_enable_advertising(hdev); 1311 } 1312 1313 /* This function requires the caller holds hdev->lock */ 1314 void hci_conn_failed(struct hci_conn *conn, u8 status) 1315 { 1316 struct hci_dev *hdev = conn->hdev; 1317 1318 bt_dev_dbg(hdev, "status 0x%2.2x", status); 1319 1320 switch (conn->type) { 1321 case LE_LINK: 1322 hci_le_conn_failed(conn, status); 1323 break; 1324 case ACL_LINK: 1325 mgmt_connect_failed(hdev, conn, status); 1326 break; 1327 } 1328 1329 /* In case of BIG/PA sync failed, clear conn flags so that 1330 * the conns will be correctly cleaned up by ISO layer 1331 */ 1332 test_and_clear_bit(HCI_CONN_BIG_SYNC_FAILED, &conn->flags); 1333 test_and_clear_bit(HCI_CONN_PA_SYNC_FAILED, &conn->flags); 1334 1335 conn->state = BT_CLOSED; 1336 hci_connect_cfm(conn, status); 1337 hci_conn_del(conn); 1338 } 1339 1340 /* This function requires the caller holds hdev->lock */ 1341 u8 hci_conn_set_handle(struct hci_conn *conn, u16 handle) 1342 { 1343 struct hci_dev *hdev = conn->hdev; 1344 1345 bt_dev_dbg(hdev, "hcon %p handle 0x%4.4x", conn, handle); 1346 1347 if (conn->handle == handle) 1348 return 0; 1349 1350 if (handle > HCI_CONN_HANDLE_MAX) { 1351 bt_dev_err(hdev, "Invalid handle: 0x%4.4x > 0x%4.4x", 1352 handle, HCI_CONN_HANDLE_MAX); 1353 return HCI_ERROR_INVALID_PARAMETERS; 1354 } 1355 1356 /* If abort_reason has been sent it means the connection is being 1357 * aborted and the handle shall not be changed. 1358 */ 1359 if (conn->abort_reason) 1360 return conn->abort_reason; 1361 1362 if (HCI_CONN_HANDLE_UNSET(conn->handle)) 1363 ida_free(&hdev->unset_handle_ida, conn->handle); 1364 1365 conn->handle = handle; 1366 1367 return 0; 1368 } 1369 1370 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst, 1371 u8 dst_type, bool dst_resolved, u8 sec_level, 1372 u16 conn_timeout, u8 role, u8 phy, u8 sec_phy) 1373 { 1374 struct hci_conn *conn; 1375 struct smp_irk *irk; 1376 int err; 1377 1378 /* Let's make sure that le is enabled.*/ 1379 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 1380 if (lmp_le_capable(hdev)) 1381 return ERR_PTR(-ECONNREFUSED); 1382 1383 return ERR_PTR(-EOPNOTSUPP); 1384 } 1385 1386 /* Since the controller supports only one LE connection attempt at a 1387 * time, we return -EBUSY if there is any connection attempt running. 1388 */ 1389 if (hci_lookup_le_connect(hdev)) 1390 return ERR_PTR(-EBUSY); 1391 1392 /* If there's already a connection object but it's not in 1393 * scanning state it means it must already be established, in 1394 * which case we can't do anything else except report a failure 1395 * to connect. 1396 */ 1397 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type); 1398 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) { 1399 return ERR_PTR(-EBUSY); 1400 } 1401 1402 /* Check if the destination address has been resolved by the controller 1403 * since if it did then the identity address shall be used. 1404 */ 1405 if (!dst_resolved) { 1406 /* When given an identity address with existing identity 1407 * resolving key, the connection needs to be established 1408 * to a resolvable random address. 1409 * 1410 * Storing the resolvable random address is required here 1411 * to handle connection failures. The address will later 1412 * be resolved back into the original identity address 1413 * from the connect request. 1414 */ 1415 irk = hci_find_irk_by_addr(hdev, dst, dst_type); 1416 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) { 1417 dst = &irk->rpa; 1418 dst_type = ADDR_LE_DEV_RANDOM; 1419 } 1420 } 1421 1422 if (conn) { 1423 bacpy(&conn->dst, dst); 1424 } else { 1425 conn = hci_conn_add_unset(hdev, LE_LINK, dst, dst_type, role); 1426 if (IS_ERR(conn)) 1427 return conn; 1428 hci_conn_hold(conn); 1429 conn->pending_sec_level = sec_level; 1430 } 1431 1432 conn->sec_level = BT_SECURITY_LOW; 1433 conn->conn_timeout = conn_timeout; 1434 conn->le_adv_phy = phy; 1435 conn->le_adv_sec_phy = sec_phy; 1436 1437 err = hci_connect_le_sync(hdev, conn); 1438 if (err) { 1439 hci_conn_del(conn); 1440 return ERR_PTR(err); 1441 } 1442 1443 return conn; 1444 } 1445 1446 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type) 1447 { 1448 struct hci_conn *conn; 1449 1450 conn = hci_conn_hash_lookup_le(hdev, addr, type); 1451 if (!conn) 1452 return false; 1453 1454 if (conn->state != BT_CONNECTED) 1455 return false; 1456 1457 return true; 1458 } 1459 1460 /* This function requires the caller holds hdev->lock */ 1461 static int hci_explicit_conn_params_set(struct hci_dev *hdev, 1462 bdaddr_t *addr, u8 addr_type) 1463 { 1464 struct hci_conn_params *params; 1465 1466 if (is_connected(hdev, addr, addr_type)) 1467 return -EISCONN; 1468 1469 params = hci_conn_params_lookup(hdev, addr, addr_type); 1470 if (!params) { 1471 params = hci_conn_params_add(hdev, addr, addr_type); 1472 if (!params) 1473 return -ENOMEM; 1474 1475 /* If we created new params, mark them to be deleted in 1476 * hci_connect_le_scan_cleanup. It's different case than 1477 * existing disabled params, those will stay after cleanup. 1478 */ 1479 params->auto_connect = HCI_AUTO_CONN_EXPLICIT; 1480 } 1481 1482 /* We're trying to connect, so make sure params are at pend_le_conns */ 1483 if (params->auto_connect == HCI_AUTO_CONN_DISABLED || 1484 params->auto_connect == HCI_AUTO_CONN_REPORT || 1485 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) { 1486 hci_pend_le_list_del_init(params); 1487 hci_pend_le_list_add(params, &hdev->pend_le_conns); 1488 } 1489 1490 params->explicit_connect = true; 1491 1492 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type, 1493 params->auto_connect); 1494 1495 return 0; 1496 } 1497 1498 static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos) 1499 { 1500 struct hci_conn *conn; 1501 u8 big; 1502 1503 /* Allocate a BIG if not set */ 1504 if (qos->bcast.big == BT_ISO_QOS_BIG_UNSET) { 1505 for (big = 0x00; big < 0xef; big++) { 1506 1507 conn = hci_conn_hash_lookup_big(hdev, big); 1508 if (!conn) 1509 break; 1510 } 1511 1512 if (big == 0xef) 1513 return -EADDRNOTAVAIL; 1514 1515 /* Update BIG */ 1516 qos->bcast.big = big; 1517 } 1518 1519 return 0; 1520 } 1521 1522 static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos) 1523 { 1524 struct hci_conn *conn; 1525 u8 bis; 1526 1527 /* Allocate BIS if not set */ 1528 if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) { 1529 if (qos->bcast.big != BT_ISO_QOS_BIG_UNSET) { 1530 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big); 1531 1532 if (conn) { 1533 /* If the BIG handle is already matched to an advertising 1534 * handle, do not allocate a new one. 1535 */ 1536 qos->bcast.bis = conn->iso_qos.bcast.bis; 1537 return 0; 1538 } 1539 } 1540 1541 /* Find an unused adv set to advertise BIS, skip instance 0x00 1542 * since it is reserved as general purpose set. 1543 */ 1544 for (bis = 0x01; bis < hdev->le_num_of_adv_sets; 1545 bis++) { 1546 1547 conn = hci_conn_hash_lookup_bis(hdev, BDADDR_ANY, bis); 1548 if (!conn) 1549 break; 1550 } 1551 1552 if (bis == hdev->le_num_of_adv_sets) 1553 return -EADDRNOTAVAIL; 1554 1555 /* Update BIS */ 1556 qos->bcast.bis = bis; 1557 } 1558 1559 return 0; 1560 } 1561 1562 /* This function requires the caller holds hdev->lock */ 1563 static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst, 1564 __u8 sid, struct bt_iso_qos *qos, 1565 __u8 base_len, __u8 *base, u16 timeout) 1566 { 1567 struct hci_conn *conn; 1568 int err; 1569 1570 /* Let's make sure that le is enabled.*/ 1571 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 1572 if (lmp_le_capable(hdev)) 1573 return ERR_PTR(-ECONNREFUSED); 1574 return ERR_PTR(-EOPNOTSUPP); 1575 } 1576 1577 err = qos_set_big(hdev, qos); 1578 if (err) 1579 return ERR_PTR(err); 1580 1581 err = qos_set_bis(hdev, qos); 1582 if (err) 1583 return ERR_PTR(err); 1584 1585 /* Check if the LE Create BIG command has already been sent */ 1586 conn = hci_conn_hash_lookup_per_adv_bis(hdev, dst, qos->bcast.big, 1587 qos->bcast.big); 1588 if (conn) 1589 return ERR_PTR(-EADDRINUSE); 1590 1591 /* Check BIS settings against other bound BISes, since all 1592 * BISes in a BIG must have the same value for all parameters 1593 */ 1594 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big); 1595 1596 if (conn && (memcmp(qos, &conn->iso_qos, sizeof(*qos)) || 1597 base_len != conn->le_per_adv_data_len || 1598 memcmp(conn->le_per_adv_data, base, base_len))) 1599 return ERR_PTR(-EADDRINUSE); 1600 1601 conn = hci_conn_add_unset(hdev, BIS_LINK, dst, 0, HCI_ROLE_MASTER); 1602 if (IS_ERR(conn)) 1603 return conn; 1604 1605 conn->state = BT_CONNECT; 1606 conn->sid = sid; 1607 conn->conn_timeout = timeout; 1608 1609 hci_conn_hold(conn); 1610 return conn; 1611 } 1612 1613 /* This function requires the caller holds hdev->lock */ 1614 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst, 1615 u8 dst_type, u8 sec_level, 1616 u16 conn_timeout, 1617 enum conn_reasons conn_reason) 1618 { 1619 struct hci_conn *conn; 1620 1621 /* Let's make sure that le is enabled.*/ 1622 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 1623 if (lmp_le_capable(hdev)) 1624 return ERR_PTR(-ECONNREFUSED); 1625 1626 return ERR_PTR(-EOPNOTSUPP); 1627 } 1628 1629 /* Some devices send ATT messages as soon as the physical link is 1630 * established. To be able to handle these ATT messages, the user- 1631 * space first establishes the connection and then starts the pairing 1632 * process. 1633 * 1634 * So if a hci_conn object already exists for the following connection 1635 * attempt, we simply update pending_sec_level and auth_type fields 1636 * and return the object found. 1637 */ 1638 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type); 1639 if (conn) { 1640 if (conn->pending_sec_level < sec_level) 1641 conn->pending_sec_level = sec_level; 1642 goto done; 1643 } 1644 1645 BT_DBG("requesting refresh of dst_addr"); 1646 1647 conn = hci_conn_add_unset(hdev, LE_LINK, dst, dst_type, 1648 HCI_ROLE_MASTER); 1649 if (IS_ERR(conn)) 1650 return conn; 1651 1652 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) { 1653 hci_conn_del(conn); 1654 return ERR_PTR(-EBUSY); 1655 } 1656 1657 conn->state = BT_CONNECT; 1658 set_bit(HCI_CONN_SCANNING, &conn->flags); 1659 conn->sec_level = BT_SECURITY_LOW; 1660 conn->pending_sec_level = sec_level; 1661 conn->conn_timeout = conn_timeout; 1662 conn->conn_reason = conn_reason; 1663 1664 hci_update_passive_scan(hdev); 1665 1666 done: 1667 hci_conn_hold(conn); 1668 return conn; 1669 } 1670 1671 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst, 1672 u8 sec_level, u8 auth_type, 1673 enum conn_reasons conn_reason, u16 timeout) 1674 { 1675 struct hci_conn *acl; 1676 1677 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) { 1678 if (lmp_bredr_capable(hdev)) 1679 return ERR_PTR(-ECONNREFUSED); 1680 1681 return ERR_PTR(-EOPNOTSUPP); 1682 } 1683 1684 /* Reject outgoing connection to device with same BD ADDR against 1685 * CVE-2020-26555 1686 */ 1687 if (!bacmp(&hdev->bdaddr, dst)) { 1688 bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n", 1689 dst); 1690 return ERR_PTR(-ECONNREFUSED); 1691 } 1692 1693 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst); 1694 if (!acl) { 1695 acl = hci_conn_add_unset(hdev, ACL_LINK, dst, 0, 1696 HCI_ROLE_MASTER); 1697 if (IS_ERR(acl)) 1698 return acl; 1699 } 1700 1701 hci_conn_hold(acl); 1702 1703 acl->conn_reason = conn_reason; 1704 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) { 1705 int err; 1706 1707 acl->sec_level = BT_SECURITY_LOW; 1708 acl->pending_sec_level = sec_level; 1709 acl->auth_type = auth_type; 1710 acl->conn_timeout = timeout; 1711 1712 err = hci_connect_acl_sync(hdev, acl); 1713 if (err) { 1714 hci_conn_del(acl); 1715 return ERR_PTR(err); 1716 } 1717 } 1718 1719 return acl; 1720 } 1721 1722 static struct hci_link *hci_conn_link(struct hci_conn *parent, 1723 struct hci_conn *conn) 1724 { 1725 struct hci_dev *hdev = parent->hdev; 1726 struct hci_link *link; 1727 1728 bt_dev_dbg(hdev, "parent %p hcon %p", parent, conn); 1729 1730 if (conn->link) 1731 return conn->link; 1732 1733 if (conn->parent) 1734 return NULL; 1735 1736 link = kzalloc(sizeof(*link), GFP_KERNEL); 1737 if (!link) 1738 return NULL; 1739 1740 link->conn = hci_conn_hold(conn); 1741 conn->link = link; 1742 conn->parent = hci_conn_get(parent); 1743 1744 /* Use list_add_tail_rcu append to the list */ 1745 list_add_tail_rcu(&link->list, &parent->link_list); 1746 1747 return link; 1748 } 1749 1750 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst, 1751 __u16 setting, struct bt_codec *codec, 1752 u16 timeout) 1753 { 1754 struct hci_conn *acl; 1755 struct hci_conn *sco; 1756 struct hci_link *link; 1757 1758 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING, 1759 CONN_REASON_SCO_CONNECT, timeout); 1760 if (IS_ERR(acl)) 1761 return acl; 1762 1763 sco = hci_conn_hash_lookup_ba(hdev, type, dst); 1764 if (!sco) { 1765 sco = hci_conn_add_unset(hdev, type, dst, 0, HCI_ROLE_MASTER); 1766 if (IS_ERR(sco)) { 1767 hci_conn_drop(acl); 1768 return sco; 1769 } 1770 } 1771 1772 link = hci_conn_link(acl, sco); 1773 if (!link) { 1774 hci_conn_drop(acl); 1775 hci_conn_drop(sco); 1776 return ERR_PTR(-ENOLINK); 1777 } 1778 1779 sco->setting = setting; 1780 sco->codec = *codec; 1781 1782 if (acl->state == BT_CONNECTED && 1783 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) { 1784 set_bit(HCI_CONN_POWER_SAVE, &acl->flags); 1785 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON); 1786 1787 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) { 1788 /* defer SCO setup until mode change completed */ 1789 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags); 1790 return sco; 1791 } 1792 1793 hci_sco_setup(acl, 0x00); 1794 } 1795 1796 return sco; 1797 } 1798 1799 static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos) 1800 { 1801 struct hci_dev *hdev = conn->hdev; 1802 struct hci_cp_le_create_big cp; 1803 struct iso_list_data data; 1804 1805 memset(&cp, 0, sizeof(cp)); 1806 1807 data.big = qos->bcast.big; 1808 data.bis = qos->bcast.bis; 1809 data.count = 0; 1810 1811 /* Create a BIS for each bound connection */ 1812 hci_conn_hash_list_state(hdev, bis_list, BIS_LINK, 1813 BT_BOUND, &data); 1814 1815 cp.handle = qos->bcast.big; 1816 cp.adv_handle = qos->bcast.bis; 1817 cp.num_bis = data.count; 1818 hci_cpu_to_le24(qos->bcast.out.interval, cp.bis.sdu_interval); 1819 cp.bis.sdu = cpu_to_le16(qos->bcast.out.sdu); 1820 cp.bis.latency = cpu_to_le16(qos->bcast.out.latency); 1821 cp.bis.rtn = qos->bcast.out.rtn; 1822 cp.bis.phy = qos->bcast.out.phy; 1823 cp.bis.packing = qos->bcast.packing; 1824 cp.bis.framing = qos->bcast.framing; 1825 cp.bis.encryption = qos->bcast.encryption; 1826 memcpy(cp.bis.bcode, qos->bcast.bcode, sizeof(cp.bis.bcode)); 1827 1828 return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp); 1829 } 1830 1831 static int set_cig_params_sync(struct hci_dev *hdev, void *data) 1832 { 1833 DEFINE_FLEX(struct hci_cp_le_set_cig_params, pdu, cis, num_cis, 0x1f); 1834 u8 cig_id = PTR_UINT(data); 1835 struct hci_conn *conn; 1836 struct bt_iso_qos *qos; 1837 u8 aux_num_cis = 0; 1838 u8 cis_id; 1839 1840 conn = hci_conn_hash_lookup_cig(hdev, cig_id); 1841 if (!conn) 1842 return 0; 1843 1844 qos = &conn->iso_qos; 1845 pdu->cig_id = cig_id; 1846 hci_cpu_to_le24(qos->ucast.out.interval, pdu->c_interval); 1847 hci_cpu_to_le24(qos->ucast.in.interval, pdu->p_interval); 1848 pdu->sca = qos->ucast.sca; 1849 pdu->packing = qos->ucast.packing; 1850 pdu->framing = qos->ucast.framing; 1851 pdu->c_latency = cpu_to_le16(qos->ucast.out.latency); 1852 pdu->p_latency = cpu_to_le16(qos->ucast.in.latency); 1853 1854 /* Reprogram all CIS(s) with the same CIG, valid range are: 1855 * num_cis: 0x00 to 0x1F 1856 * cis_id: 0x00 to 0xEF 1857 */ 1858 for (cis_id = 0x00; cis_id < 0xf0 && 1859 aux_num_cis < pdu->num_cis; cis_id++) { 1860 struct hci_cis_params *cis; 1861 1862 conn = hci_conn_hash_lookup_cis(hdev, NULL, 0, cig_id, cis_id); 1863 if (!conn) 1864 continue; 1865 1866 qos = &conn->iso_qos; 1867 1868 cis = &pdu->cis[aux_num_cis++]; 1869 cis->cis_id = cis_id; 1870 cis->c_sdu = cpu_to_le16(conn->iso_qos.ucast.out.sdu); 1871 cis->p_sdu = cpu_to_le16(conn->iso_qos.ucast.in.sdu); 1872 cis->c_phy = qos->ucast.out.phy ? qos->ucast.out.phy : 1873 qos->ucast.in.phy; 1874 cis->p_phy = qos->ucast.in.phy ? qos->ucast.in.phy : 1875 qos->ucast.out.phy; 1876 cis->c_rtn = qos->ucast.out.rtn; 1877 cis->p_rtn = qos->ucast.in.rtn; 1878 } 1879 pdu->num_cis = aux_num_cis; 1880 1881 if (!pdu->num_cis) 1882 return 0; 1883 1884 return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS, 1885 struct_size(pdu, cis, pdu->num_cis), 1886 pdu, HCI_CMD_TIMEOUT); 1887 } 1888 1889 static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos) 1890 { 1891 struct hci_dev *hdev = conn->hdev; 1892 struct iso_list_data data; 1893 1894 memset(&data, 0, sizeof(data)); 1895 1896 /* Allocate first still reconfigurable CIG if not set */ 1897 if (qos->ucast.cig == BT_ISO_QOS_CIG_UNSET) { 1898 for (data.cig = 0x00; data.cig < 0xf0; data.cig++) { 1899 data.count = 0; 1900 1901 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, 1902 BT_CONNECT, &data); 1903 if (data.count) 1904 continue; 1905 1906 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, 1907 BT_CONNECTED, &data); 1908 if (!data.count) 1909 break; 1910 } 1911 1912 if (data.cig == 0xf0) 1913 return false; 1914 1915 /* Update CIG */ 1916 qos->ucast.cig = data.cig; 1917 } 1918 1919 if (qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) { 1920 if (hci_conn_hash_lookup_cis(hdev, NULL, 0, qos->ucast.cig, 1921 qos->ucast.cis)) 1922 return false; 1923 goto done; 1924 } 1925 1926 /* Allocate first available CIS if not set */ 1927 for (data.cig = qos->ucast.cig, data.cis = 0x00; data.cis < 0xf0; 1928 data.cis++) { 1929 if (!hci_conn_hash_lookup_cis(hdev, NULL, 0, data.cig, 1930 data.cis)) { 1931 /* Update CIS */ 1932 qos->ucast.cis = data.cis; 1933 break; 1934 } 1935 } 1936 1937 if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET) 1938 return false; 1939 1940 done: 1941 if (hci_cmd_sync_queue(hdev, set_cig_params_sync, 1942 UINT_PTR(qos->ucast.cig), NULL) < 0) 1943 return false; 1944 1945 return true; 1946 } 1947 1948 struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst, 1949 __u8 dst_type, struct bt_iso_qos *qos, 1950 u16 timeout) 1951 { 1952 struct hci_conn *cis; 1953 1954 cis = hci_conn_hash_lookup_cis(hdev, dst, dst_type, qos->ucast.cig, 1955 qos->ucast.cis); 1956 if (!cis) { 1957 cis = hci_conn_add_unset(hdev, CIS_LINK, dst, dst_type, 1958 HCI_ROLE_MASTER); 1959 if (IS_ERR(cis)) 1960 return cis; 1961 cis->cleanup = cis_cleanup; 1962 cis->dst_type = dst_type; 1963 cis->iso_qos.ucast.cig = BT_ISO_QOS_CIG_UNSET; 1964 cis->iso_qos.ucast.cis = BT_ISO_QOS_CIS_UNSET; 1965 cis->conn_timeout = timeout; 1966 } 1967 1968 if (cis->state == BT_CONNECTED) 1969 return cis; 1970 1971 /* Check if CIS has been set and the settings matches */ 1972 if (cis->state == BT_BOUND && 1973 !memcmp(&cis->iso_qos, qos, sizeof(*qos))) 1974 return cis; 1975 1976 /* Update LINK PHYs according to QoS preference */ 1977 cis->le_tx_phy = qos->ucast.out.phy; 1978 cis->le_rx_phy = qos->ucast.in.phy; 1979 1980 /* If output interval is not set use the input interval as it cannot be 1981 * 0x000000. 1982 */ 1983 if (!qos->ucast.out.interval) 1984 qos->ucast.out.interval = qos->ucast.in.interval; 1985 1986 /* If input interval is not set use the output interval as it cannot be 1987 * 0x000000. 1988 */ 1989 if (!qos->ucast.in.interval) 1990 qos->ucast.in.interval = qos->ucast.out.interval; 1991 1992 /* If output latency is not set use the input latency as it cannot be 1993 * 0x0000. 1994 */ 1995 if (!qos->ucast.out.latency) 1996 qos->ucast.out.latency = qos->ucast.in.latency; 1997 1998 /* If input latency is not set use the output latency as it cannot be 1999 * 0x0000. 2000 */ 2001 if (!qos->ucast.in.latency) 2002 qos->ucast.in.latency = qos->ucast.out.latency; 2003 2004 if (!hci_le_set_cig_params(cis, qos)) { 2005 hci_conn_drop(cis); 2006 return ERR_PTR(-EINVAL); 2007 } 2008 2009 hci_conn_hold(cis); 2010 2011 cis->iso_qos = *qos; 2012 cis->state = BT_BOUND; 2013 2014 return cis; 2015 } 2016 2017 bool hci_iso_setup_path(struct hci_conn *conn) 2018 { 2019 struct hci_dev *hdev = conn->hdev; 2020 struct hci_cp_le_setup_iso_path cmd; 2021 2022 memset(&cmd, 0, sizeof(cmd)); 2023 2024 if (conn->iso_qos.ucast.out.sdu) { 2025 cmd.handle = cpu_to_le16(conn->handle); 2026 cmd.direction = 0x00; /* Input (Host to Controller) */ 2027 cmd.path = 0x00; /* HCI path if enabled */ 2028 cmd.codec = 0x03; /* Transparent Data */ 2029 2030 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd), 2031 &cmd) < 0) 2032 return false; 2033 } 2034 2035 if (conn->iso_qos.ucast.in.sdu) { 2036 cmd.handle = cpu_to_le16(conn->handle); 2037 cmd.direction = 0x01; /* Output (Controller to Host) */ 2038 cmd.path = 0x00; /* HCI path if enabled */ 2039 cmd.codec = 0x03; /* Transparent Data */ 2040 2041 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd), 2042 &cmd) < 0) 2043 return false; 2044 } 2045 2046 return true; 2047 } 2048 2049 int hci_conn_check_create_cis(struct hci_conn *conn) 2050 { 2051 if (conn->type != CIS_LINK) 2052 return -EINVAL; 2053 2054 if (!conn->parent || conn->parent->state != BT_CONNECTED || 2055 conn->state != BT_CONNECT || HCI_CONN_HANDLE_UNSET(conn->handle)) 2056 return 1; 2057 2058 return 0; 2059 } 2060 2061 static int hci_create_cis_sync(struct hci_dev *hdev, void *data) 2062 { 2063 return hci_le_create_cis_sync(hdev); 2064 } 2065 2066 int hci_le_create_cis_pending(struct hci_dev *hdev) 2067 { 2068 struct hci_conn *conn; 2069 bool pending = false; 2070 2071 rcu_read_lock(); 2072 2073 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) { 2074 if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) { 2075 rcu_read_unlock(); 2076 return -EBUSY; 2077 } 2078 2079 if (!hci_conn_check_create_cis(conn)) 2080 pending = true; 2081 } 2082 2083 rcu_read_unlock(); 2084 2085 if (!pending) 2086 return 0; 2087 2088 /* Queue Create CIS */ 2089 return hci_cmd_sync_queue(hdev, hci_create_cis_sync, NULL, NULL); 2090 } 2091 2092 static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn, 2093 struct bt_iso_io_qos *qos, __u8 phy) 2094 { 2095 /* Only set MTU if PHY is enabled */ 2096 if (!qos->sdu && qos->phy) 2097 qos->sdu = conn->mtu; 2098 2099 /* Use the same PHY as ACL if set to any */ 2100 if (qos->phy == BT_ISO_PHY_ANY) 2101 qos->phy = phy; 2102 2103 /* Use LE ACL connection interval if not set */ 2104 if (!qos->interval) 2105 /* ACL interval unit in 1.25 ms to us */ 2106 qos->interval = conn->le_conn_interval * 1250; 2107 2108 /* Use LE ACL connection latency if not set */ 2109 if (!qos->latency) 2110 qos->latency = conn->le_conn_latency; 2111 } 2112 2113 static int create_big_sync(struct hci_dev *hdev, void *data) 2114 { 2115 struct hci_conn *conn = data; 2116 struct bt_iso_qos *qos = &conn->iso_qos; 2117 u16 interval, sync_interval = 0; 2118 u32 flags = 0; 2119 int err; 2120 2121 if (qos->bcast.out.phy == 0x02) 2122 flags |= MGMT_ADV_FLAG_SEC_2M; 2123 2124 /* Align intervals */ 2125 interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor; 2126 2127 if (qos->bcast.bis) 2128 sync_interval = interval * 4; 2129 2130 err = hci_start_per_adv_sync(hdev, qos->bcast.bis, conn->sid, 2131 conn->le_per_adv_data_len, 2132 conn->le_per_adv_data, flags, interval, 2133 interval, sync_interval); 2134 if (err) 2135 return err; 2136 2137 return hci_le_create_big(conn, &conn->iso_qos); 2138 } 2139 2140 struct hci_conn *hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst, 2141 __u8 dst_type, __u8 sid, 2142 struct bt_iso_qos *qos) 2143 { 2144 struct hci_conn *conn; 2145 2146 bt_dev_dbg(hdev, "dst %pMR type %d sid %d", dst, dst_type, sid); 2147 2148 conn = hci_conn_add_unset(hdev, PA_LINK, dst, dst_type, HCI_ROLE_SLAVE); 2149 if (IS_ERR(conn)) 2150 return conn; 2151 2152 conn->iso_qos = *qos; 2153 conn->sid = sid; 2154 conn->state = BT_LISTEN; 2155 conn->conn_timeout = msecs_to_jiffies(qos->bcast.sync_timeout * 10); 2156 2157 hci_conn_hold(conn); 2158 2159 hci_connect_pa_sync(hdev, conn); 2160 2161 return conn; 2162 } 2163 2164 int hci_conn_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon, 2165 struct bt_iso_qos *qos, __u16 sync_handle, 2166 __u8 num_bis, __u8 bis[]) 2167 { 2168 int err; 2169 2170 if (num_bis < 0x01 || num_bis > ISO_MAX_NUM_BIS) 2171 return -EINVAL; 2172 2173 err = qos_set_big(hdev, qos); 2174 if (err) 2175 return err; 2176 2177 if (hcon) { 2178 /* Update hcon QoS */ 2179 hcon->iso_qos = *qos; 2180 2181 hcon->num_bis = num_bis; 2182 memcpy(hcon->bis, bis, num_bis); 2183 hcon->conn_timeout = msecs_to_jiffies(qos->bcast.timeout * 10); 2184 } 2185 2186 return hci_connect_big_sync(hdev, hcon); 2187 } 2188 2189 static void create_big_complete(struct hci_dev *hdev, void *data, int err) 2190 { 2191 struct hci_conn *conn = data; 2192 2193 bt_dev_dbg(hdev, "conn %p", conn); 2194 2195 if (err) { 2196 bt_dev_err(hdev, "Unable to create BIG: %d", err); 2197 hci_connect_cfm(conn, err); 2198 hci_conn_del(conn); 2199 } 2200 } 2201 2202 struct hci_conn *hci_bind_bis(struct hci_dev *hdev, bdaddr_t *dst, __u8 sid, 2203 struct bt_iso_qos *qos, 2204 __u8 base_len, __u8 *base, u16 timeout) 2205 { 2206 struct hci_conn *conn; 2207 struct hci_conn *parent; 2208 __u8 eir[HCI_MAX_PER_AD_LENGTH]; 2209 struct hci_link *link; 2210 2211 /* Look for any BIS that is open for rebinding */ 2212 conn = hci_conn_hash_lookup_big_state(hdev, qos->bcast.big, BT_OPEN, 2213 HCI_ROLE_MASTER); 2214 if (conn) { 2215 memcpy(qos, &conn->iso_qos, sizeof(*qos)); 2216 conn->state = BT_CONNECTED; 2217 return conn; 2218 } 2219 2220 if (base_len && base) 2221 base_len = eir_append_service_data(eir, 0, 0x1851, 2222 base, base_len); 2223 2224 /* We need hci_conn object using the BDADDR_ANY as dst */ 2225 conn = hci_add_bis(hdev, dst, sid, qos, base_len, eir, timeout); 2226 if (IS_ERR(conn)) 2227 return conn; 2228 2229 /* Update LINK PHYs according to QoS preference */ 2230 conn->le_tx_phy = qos->bcast.out.phy; 2231 conn->le_tx_phy = qos->bcast.out.phy; 2232 2233 /* Add Basic Announcement into Peridic Adv Data if BASE is set */ 2234 if (base_len && base) { 2235 memcpy(conn->le_per_adv_data, eir, sizeof(eir)); 2236 conn->le_per_adv_data_len = base_len; 2237 } 2238 2239 hci_iso_qos_setup(hdev, conn, &qos->bcast.out, 2240 conn->le_tx_phy ? conn->le_tx_phy : 2241 hdev->le_tx_def_phys); 2242 2243 conn->iso_qos = *qos; 2244 conn->state = BT_BOUND; 2245 2246 /* Link BISes together */ 2247 parent = hci_conn_hash_lookup_big(hdev, 2248 conn->iso_qos.bcast.big); 2249 if (parent && parent != conn) { 2250 link = hci_conn_link(parent, conn); 2251 hci_conn_drop(conn); 2252 if (!link) 2253 return ERR_PTR(-ENOLINK); 2254 } 2255 2256 return conn; 2257 } 2258 2259 int hci_past_bis(struct hci_conn *conn, bdaddr_t *dst, __u8 dst_type) 2260 { 2261 struct hci_conn *le; 2262 2263 /* Lookup existing LE connection to rebind to */ 2264 le = hci_conn_hash_lookup_le(conn->hdev, dst, dst_type); 2265 if (!le) 2266 return -EINVAL; 2267 2268 return hci_past_sync(conn, le); 2269 } 2270 2271 static void bis_mark_per_adv(struct hci_conn *conn, void *data) 2272 { 2273 struct iso_list_data *d = data; 2274 2275 /* Skip if not broadcast/ANY address */ 2276 if (bacmp(&conn->dst, BDADDR_ANY)) 2277 return; 2278 2279 if (d->big != conn->iso_qos.bcast.big || 2280 d->bis == BT_ISO_QOS_BIS_UNSET || 2281 d->bis != conn->iso_qos.bcast.bis) 2282 return; 2283 2284 set_bit(HCI_CONN_PER_ADV, &conn->flags); 2285 } 2286 2287 struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst, 2288 __u8 dst_type, __u8 sid, 2289 struct bt_iso_qos *qos, 2290 __u8 base_len, __u8 *base, u16 timeout) 2291 { 2292 struct hci_conn *conn; 2293 int err; 2294 struct iso_list_data data; 2295 2296 conn = hci_bind_bis(hdev, dst, sid, qos, base_len, base, timeout); 2297 if (IS_ERR(conn)) 2298 return conn; 2299 2300 if (conn->state == BT_CONNECTED) 2301 return conn; 2302 2303 /* Check if SID needs to be allocated then search for the first 2304 * available. 2305 */ 2306 if (conn->sid == HCI_SID_INVALID) { 2307 u8 sid; 2308 2309 for (sid = 0; sid <= 0x0f; sid++) { 2310 if (!hci_find_adv_sid(hdev, sid)) { 2311 conn->sid = sid; 2312 break; 2313 } 2314 } 2315 } 2316 2317 data.big = qos->bcast.big; 2318 data.bis = qos->bcast.bis; 2319 2320 /* Set HCI_CONN_PER_ADV for all bound connections, to mark that 2321 * the start periodic advertising and create BIG commands have 2322 * been queued 2323 */ 2324 hci_conn_hash_list_state(hdev, bis_mark_per_adv, BIS_LINK, 2325 BT_BOUND, &data); 2326 2327 /* Queue start periodic advertising and create BIG */ 2328 err = hci_cmd_sync_queue(hdev, create_big_sync, conn, 2329 create_big_complete); 2330 if (err < 0) { 2331 hci_conn_drop(conn); 2332 return ERR_PTR(err); 2333 } 2334 2335 return conn; 2336 } 2337 2338 struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst, 2339 __u8 dst_type, struct bt_iso_qos *qos, 2340 u16 timeout) 2341 { 2342 struct hci_conn *le; 2343 struct hci_conn *cis; 2344 struct hci_link *link; 2345 2346 if (hci_dev_test_flag(hdev, HCI_ADVERTISING)) 2347 le = hci_connect_le(hdev, dst, dst_type, false, 2348 BT_SECURITY_LOW, 2349 HCI_LE_CONN_TIMEOUT, 2350 HCI_ROLE_SLAVE, 0, 0); 2351 else 2352 le = hci_connect_le_scan(hdev, dst, dst_type, 2353 BT_SECURITY_LOW, 2354 HCI_LE_CONN_TIMEOUT, 2355 CONN_REASON_ISO_CONNECT); 2356 if (IS_ERR(le)) 2357 return le; 2358 2359 hci_iso_qos_setup(hdev, le, &qos->ucast.out, 2360 le->le_tx_phy ? le->le_tx_phy : hdev->le_tx_def_phys); 2361 hci_iso_qos_setup(hdev, le, &qos->ucast.in, 2362 le->le_rx_phy ? le->le_rx_phy : hdev->le_rx_def_phys); 2363 2364 cis = hci_bind_cis(hdev, dst, dst_type, qos, timeout); 2365 if (IS_ERR(cis)) { 2366 hci_conn_drop(le); 2367 return cis; 2368 } 2369 2370 link = hci_conn_link(le, cis); 2371 hci_conn_drop(cis); 2372 if (!link) { 2373 hci_conn_drop(le); 2374 return ERR_PTR(-ENOLINK); 2375 } 2376 2377 cis->state = BT_CONNECT; 2378 2379 hci_le_create_cis_pending(hdev); 2380 2381 return cis; 2382 } 2383 2384 /* Check link security requirement */ 2385 int hci_conn_check_link_mode(struct hci_conn *conn) 2386 { 2387 BT_DBG("hcon %p", conn); 2388 2389 /* In Secure Connections Only mode, it is required that Secure 2390 * Connections is used and the link is encrypted with AES-CCM 2391 * using a P-256 authenticated combination key. 2392 */ 2393 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) { 2394 if (!hci_conn_sc_enabled(conn) || 2395 !test_bit(HCI_CONN_AES_CCM, &conn->flags) || 2396 conn->key_type != HCI_LK_AUTH_COMBINATION_P256) 2397 return 0; 2398 } 2399 2400 /* AES encryption is required for Level 4: 2401 * 2402 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C 2403 * page 1319: 2404 * 2405 * 128-bit equivalent strength for link and encryption keys 2406 * required using FIPS approved algorithms (E0 not allowed, 2407 * SAFER+ not allowed, and P-192 not allowed; encryption key 2408 * not shortened) 2409 */ 2410 if (conn->sec_level == BT_SECURITY_FIPS && 2411 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) { 2412 bt_dev_err(conn->hdev, 2413 "Invalid security: Missing AES-CCM usage"); 2414 return 0; 2415 } 2416 2417 if (hci_conn_ssp_enabled(conn) && 2418 !test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 2419 return 0; 2420 2421 return 1; 2422 } 2423 2424 /* Authenticate remote device */ 2425 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type) 2426 { 2427 BT_DBG("hcon %p", conn); 2428 2429 if (conn->pending_sec_level > sec_level) 2430 sec_level = conn->pending_sec_level; 2431 2432 if (sec_level > conn->sec_level) 2433 conn->pending_sec_level = sec_level; 2434 else if (test_bit(HCI_CONN_AUTH, &conn->flags)) 2435 return 1; 2436 2437 /* Make sure we preserve an existing MITM requirement*/ 2438 auth_type |= (conn->auth_type & 0x01); 2439 2440 conn->auth_type = auth_type; 2441 2442 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) { 2443 struct hci_cp_auth_requested cp; 2444 2445 cp.handle = cpu_to_le16(conn->handle); 2446 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED, 2447 sizeof(cp), &cp); 2448 2449 /* Set the ENCRYPT_PEND to trigger encryption after 2450 * authentication. 2451 */ 2452 if (!test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 2453 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags); 2454 } 2455 2456 return 0; 2457 } 2458 2459 /* Encrypt the link */ 2460 static void hci_conn_encrypt(struct hci_conn *conn) 2461 { 2462 BT_DBG("hcon %p", conn); 2463 2464 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) { 2465 struct hci_cp_set_conn_encrypt cp; 2466 cp.handle = cpu_to_le16(conn->handle); 2467 cp.encrypt = 0x01; 2468 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp), 2469 &cp); 2470 } 2471 } 2472 2473 /* Enable security */ 2474 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type, 2475 bool initiator) 2476 { 2477 BT_DBG("hcon %p", conn); 2478 2479 if (conn->type == LE_LINK) 2480 return smp_conn_security(conn, sec_level); 2481 2482 /* For sdp we don't need the link key. */ 2483 if (sec_level == BT_SECURITY_SDP) 2484 return 1; 2485 2486 /* For non 2.1 devices and low security level we don't need the link 2487 key. */ 2488 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn)) 2489 return 1; 2490 2491 /* For other security levels we need the link key. */ 2492 if (!test_bit(HCI_CONN_AUTH, &conn->flags)) 2493 goto auth; 2494 2495 switch (conn->key_type) { 2496 case HCI_LK_AUTH_COMBINATION_P256: 2497 /* An authenticated FIPS approved combination key has 2498 * sufficient security for security level 4 or lower. 2499 */ 2500 if (sec_level <= BT_SECURITY_FIPS) 2501 goto encrypt; 2502 break; 2503 case HCI_LK_AUTH_COMBINATION_P192: 2504 /* An authenticated combination key has sufficient security for 2505 * security level 3 or lower. 2506 */ 2507 if (sec_level <= BT_SECURITY_HIGH) 2508 goto encrypt; 2509 break; 2510 case HCI_LK_UNAUTH_COMBINATION_P192: 2511 case HCI_LK_UNAUTH_COMBINATION_P256: 2512 /* An unauthenticated combination key has sufficient security 2513 * for security level 2 or lower. 2514 */ 2515 if (sec_level <= BT_SECURITY_MEDIUM) 2516 goto encrypt; 2517 break; 2518 case HCI_LK_COMBINATION: 2519 /* A combination key has always sufficient security for the 2520 * security levels 2 or lower. High security level requires the 2521 * combination key is generated using maximum PIN code length 2522 * (16). For pre 2.1 units. 2523 */ 2524 if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16) 2525 goto encrypt; 2526 break; 2527 default: 2528 break; 2529 } 2530 2531 auth: 2532 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) 2533 return 0; 2534 2535 if (initiator) 2536 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags); 2537 2538 if (!hci_conn_auth(conn, sec_level, auth_type)) 2539 return 0; 2540 2541 encrypt: 2542 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) { 2543 /* Ensure that the encryption key size has been read, 2544 * otherwise stall the upper layer responses. 2545 */ 2546 if (!conn->enc_key_size) 2547 return 0; 2548 2549 /* Nothing else needed, all requirements are met */ 2550 return 1; 2551 } 2552 2553 hci_conn_encrypt(conn); 2554 return 0; 2555 } 2556 EXPORT_SYMBOL(hci_conn_security); 2557 2558 /* Check secure link requirement */ 2559 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level) 2560 { 2561 BT_DBG("hcon %p", conn); 2562 2563 /* Accept if non-secure or higher security level is required */ 2564 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS) 2565 return 1; 2566 2567 /* Accept if secure or higher security level is already present */ 2568 if (conn->sec_level == BT_SECURITY_HIGH || 2569 conn->sec_level == BT_SECURITY_FIPS) 2570 return 1; 2571 2572 /* Reject not secure link */ 2573 return 0; 2574 } 2575 EXPORT_SYMBOL(hci_conn_check_secure); 2576 2577 /* Switch role */ 2578 int hci_conn_switch_role(struct hci_conn *conn, __u8 role) 2579 { 2580 BT_DBG("hcon %p", conn); 2581 2582 if (role == conn->role) 2583 return 1; 2584 2585 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) { 2586 struct hci_cp_switch_role cp; 2587 bacpy(&cp.bdaddr, &conn->dst); 2588 cp.role = role; 2589 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp); 2590 } 2591 2592 return 0; 2593 } 2594 EXPORT_SYMBOL(hci_conn_switch_role); 2595 2596 /* Enter active mode */ 2597 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active) 2598 { 2599 struct hci_dev *hdev = conn->hdev; 2600 2601 BT_DBG("hcon %p mode %d", conn, conn->mode); 2602 2603 if (conn->mode != HCI_CM_SNIFF) 2604 goto timer; 2605 2606 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active) 2607 goto timer; 2608 2609 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { 2610 struct hci_cp_exit_sniff_mode cp; 2611 cp.handle = cpu_to_le16(conn->handle); 2612 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp); 2613 } 2614 2615 timer: 2616 if (hdev->idle_timeout > 0) 2617 queue_delayed_work(hdev->workqueue, &conn->idle_work, 2618 msecs_to_jiffies(hdev->idle_timeout)); 2619 } 2620 2621 /* Drop all connection on the device */ 2622 void hci_conn_hash_flush(struct hci_dev *hdev) 2623 { 2624 struct list_head *head = &hdev->conn_hash.list; 2625 struct hci_conn *conn; 2626 2627 BT_DBG("hdev %s", hdev->name); 2628 2629 /* We should not traverse the list here, because hci_conn_del 2630 * can remove extra links, which may cause the list traversal 2631 * to hit items that have already been released. 2632 */ 2633 while ((conn = list_first_entry_or_null(head, 2634 struct hci_conn, 2635 list)) != NULL) { 2636 conn->state = BT_CLOSED; 2637 hci_disconn_cfm(conn, HCI_ERROR_LOCAL_HOST_TERM); 2638 hci_conn_del(conn); 2639 } 2640 } 2641 2642 static u32 get_link_mode(struct hci_conn *conn) 2643 { 2644 u32 link_mode = 0; 2645 2646 if (conn->role == HCI_ROLE_MASTER) 2647 link_mode |= HCI_LM_MASTER; 2648 2649 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 2650 link_mode |= HCI_LM_ENCRYPT; 2651 2652 if (test_bit(HCI_CONN_AUTH, &conn->flags)) 2653 link_mode |= HCI_LM_AUTH; 2654 2655 if (test_bit(HCI_CONN_SECURE, &conn->flags)) 2656 link_mode |= HCI_LM_SECURE; 2657 2658 if (test_bit(HCI_CONN_FIPS, &conn->flags)) 2659 link_mode |= HCI_LM_FIPS; 2660 2661 return link_mode; 2662 } 2663 2664 int hci_get_conn_list(void __user *arg) 2665 { 2666 struct hci_conn *c; 2667 struct hci_conn_list_req req, *cl; 2668 struct hci_conn_info *ci; 2669 struct hci_dev *hdev; 2670 int n = 0, size, err; 2671 2672 if (copy_from_user(&req, arg, sizeof(req))) 2673 return -EFAULT; 2674 2675 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci)) 2676 return -EINVAL; 2677 2678 size = sizeof(req) + req.conn_num * sizeof(*ci); 2679 2680 cl = kmalloc(size, GFP_KERNEL); 2681 if (!cl) 2682 return -ENOMEM; 2683 2684 hdev = hci_dev_get(req.dev_id); 2685 if (!hdev) { 2686 kfree(cl); 2687 return -ENODEV; 2688 } 2689 2690 ci = cl->conn_info; 2691 2692 hci_dev_lock(hdev); 2693 list_for_each_entry(c, &hdev->conn_hash.list, list) { 2694 bacpy(&(ci + n)->bdaddr, &c->dst); 2695 (ci + n)->handle = c->handle; 2696 (ci + n)->type = c->type; 2697 (ci + n)->out = c->out; 2698 (ci + n)->state = c->state; 2699 (ci + n)->link_mode = get_link_mode(c); 2700 if (++n >= req.conn_num) 2701 break; 2702 } 2703 hci_dev_unlock(hdev); 2704 2705 cl->dev_id = hdev->id; 2706 cl->conn_num = n; 2707 size = sizeof(req) + n * sizeof(*ci); 2708 2709 hci_dev_put(hdev); 2710 2711 err = copy_to_user(arg, cl, size); 2712 kfree(cl); 2713 2714 return err ? -EFAULT : 0; 2715 } 2716 2717 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg) 2718 { 2719 struct hci_conn_info_req req; 2720 struct hci_conn_info ci; 2721 struct hci_conn *conn; 2722 char __user *ptr = arg + sizeof(req); 2723 2724 if (copy_from_user(&req, arg, sizeof(req))) 2725 return -EFAULT; 2726 2727 hci_dev_lock(hdev); 2728 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr); 2729 if (conn) { 2730 bacpy(&ci.bdaddr, &conn->dst); 2731 ci.handle = conn->handle; 2732 ci.type = conn->type; 2733 ci.out = conn->out; 2734 ci.state = conn->state; 2735 ci.link_mode = get_link_mode(conn); 2736 } 2737 hci_dev_unlock(hdev); 2738 2739 if (!conn) 2740 return -ENOENT; 2741 2742 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0; 2743 } 2744 2745 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg) 2746 { 2747 struct hci_auth_info_req req; 2748 struct hci_conn *conn; 2749 2750 if (copy_from_user(&req, arg, sizeof(req))) 2751 return -EFAULT; 2752 2753 hci_dev_lock(hdev); 2754 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr); 2755 if (conn) 2756 req.type = conn->auth_type; 2757 hci_dev_unlock(hdev); 2758 2759 if (!conn) 2760 return -ENOENT; 2761 2762 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0; 2763 } 2764 2765 struct hci_chan *hci_chan_create(struct hci_conn *conn) 2766 { 2767 struct hci_dev *hdev = conn->hdev; 2768 struct hci_chan *chan; 2769 2770 BT_DBG("%s hcon %p", hdev->name, conn); 2771 2772 if (test_bit(HCI_CONN_DROP, &conn->flags)) { 2773 BT_DBG("Refusing to create new hci_chan"); 2774 return NULL; 2775 } 2776 2777 chan = kzalloc(sizeof(*chan), GFP_KERNEL); 2778 if (!chan) 2779 return NULL; 2780 2781 chan->conn = hci_conn_get(conn); 2782 skb_queue_head_init(&chan->data_q); 2783 chan->state = BT_CONNECTED; 2784 2785 list_add_rcu(&chan->list, &conn->chan_list); 2786 2787 return chan; 2788 } 2789 2790 void hci_chan_del(struct hci_chan *chan) 2791 { 2792 struct hci_conn *conn = chan->conn; 2793 struct hci_dev *hdev = conn->hdev; 2794 2795 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan); 2796 2797 list_del_rcu(&chan->list); 2798 2799 synchronize_rcu(); 2800 2801 /* Prevent new hci_chan's to be created for this hci_conn */ 2802 set_bit(HCI_CONN_DROP, &conn->flags); 2803 2804 hci_conn_put(conn); 2805 2806 skb_queue_purge(&chan->data_q); 2807 kfree(chan); 2808 } 2809 2810 void hci_chan_list_flush(struct hci_conn *conn) 2811 { 2812 struct hci_chan *chan, *n; 2813 2814 BT_DBG("hcon %p", conn); 2815 2816 list_for_each_entry_safe(chan, n, &conn->chan_list, list) 2817 hci_chan_del(chan); 2818 } 2819 2820 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon, 2821 __u16 handle) 2822 { 2823 struct hci_chan *hchan; 2824 2825 list_for_each_entry(hchan, &hcon->chan_list, list) { 2826 if (hchan->handle == handle) 2827 return hchan; 2828 } 2829 2830 return NULL; 2831 } 2832 2833 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle) 2834 { 2835 struct hci_conn_hash *h = &hdev->conn_hash; 2836 struct hci_conn *hcon; 2837 struct hci_chan *hchan = NULL; 2838 2839 rcu_read_lock(); 2840 2841 list_for_each_entry_rcu(hcon, &h->list, list) { 2842 hchan = __hci_chan_lookup_handle(hcon, handle); 2843 if (hchan) 2844 break; 2845 } 2846 2847 rcu_read_unlock(); 2848 2849 return hchan; 2850 } 2851 2852 u32 hci_conn_get_phy(struct hci_conn *conn) 2853 { 2854 u32 phys = 0; 2855 2856 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471: 2857 * Table 6.2: Packets defined for synchronous, asynchronous, and 2858 * CPB logical transport types. 2859 */ 2860 switch (conn->type) { 2861 case SCO_LINK: 2862 /* SCO logical transport (1 Mb/s): 2863 * HV1, HV2, HV3 and DV. 2864 */ 2865 phys |= BT_PHY_BR_1M_1SLOT; 2866 2867 break; 2868 2869 case ACL_LINK: 2870 /* ACL logical transport (1 Mb/s) ptt=0: 2871 * DH1, DM3, DH3, DM5 and DH5. 2872 */ 2873 phys |= BT_PHY_BR_1M_1SLOT; 2874 2875 if (conn->pkt_type & (HCI_DM3 | HCI_DH3)) 2876 phys |= BT_PHY_BR_1M_3SLOT; 2877 2878 if (conn->pkt_type & (HCI_DM5 | HCI_DH5)) 2879 phys |= BT_PHY_BR_1M_5SLOT; 2880 2881 /* ACL logical transport (2 Mb/s) ptt=1: 2882 * 2-DH1, 2-DH3 and 2-DH5. 2883 */ 2884 if (!(conn->pkt_type & HCI_2DH1)) 2885 phys |= BT_PHY_EDR_2M_1SLOT; 2886 2887 if (!(conn->pkt_type & HCI_2DH3)) 2888 phys |= BT_PHY_EDR_2M_3SLOT; 2889 2890 if (!(conn->pkt_type & HCI_2DH5)) 2891 phys |= BT_PHY_EDR_2M_5SLOT; 2892 2893 /* ACL logical transport (3 Mb/s) ptt=1: 2894 * 3-DH1, 3-DH3 and 3-DH5. 2895 */ 2896 if (!(conn->pkt_type & HCI_3DH1)) 2897 phys |= BT_PHY_EDR_3M_1SLOT; 2898 2899 if (!(conn->pkt_type & HCI_3DH3)) 2900 phys |= BT_PHY_EDR_3M_3SLOT; 2901 2902 if (!(conn->pkt_type & HCI_3DH5)) 2903 phys |= BT_PHY_EDR_3M_5SLOT; 2904 2905 break; 2906 2907 case ESCO_LINK: 2908 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */ 2909 phys |= BT_PHY_BR_1M_1SLOT; 2910 2911 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5))) 2912 phys |= BT_PHY_BR_1M_3SLOT; 2913 2914 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */ 2915 if (!(conn->pkt_type & ESCO_2EV3)) 2916 phys |= BT_PHY_EDR_2M_1SLOT; 2917 2918 if (!(conn->pkt_type & ESCO_2EV5)) 2919 phys |= BT_PHY_EDR_2M_3SLOT; 2920 2921 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */ 2922 if (!(conn->pkt_type & ESCO_3EV3)) 2923 phys |= BT_PHY_EDR_3M_1SLOT; 2924 2925 if (!(conn->pkt_type & ESCO_3EV5)) 2926 phys |= BT_PHY_EDR_3M_3SLOT; 2927 2928 break; 2929 2930 case LE_LINK: 2931 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M) 2932 phys |= BT_PHY_LE_1M_TX; 2933 2934 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M) 2935 phys |= BT_PHY_LE_1M_RX; 2936 2937 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M) 2938 phys |= BT_PHY_LE_2M_TX; 2939 2940 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M) 2941 phys |= BT_PHY_LE_2M_RX; 2942 2943 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED) 2944 phys |= BT_PHY_LE_CODED_TX; 2945 2946 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED) 2947 phys |= BT_PHY_LE_CODED_RX; 2948 2949 break; 2950 } 2951 2952 return phys; 2953 } 2954 2955 static int abort_conn_sync(struct hci_dev *hdev, void *data) 2956 { 2957 struct hci_conn *conn = data; 2958 2959 if (!hci_conn_valid(hdev, conn)) 2960 return -ECANCELED; 2961 2962 return hci_abort_conn_sync(hdev, conn, conn->abort_reason); 2963 } 2964 2965 int hci_abort_conn(struct hci_conn *conn, u8 reason) 2966 { 2967 struct hci_dev *hdev = conn->hdev; 2968 2969 /* If abort_reason has already been set it means the connection is 2970 * already being aborted so don't attempt to overwrite it. 2971 */ 2972 if (conn->abort_reason) 2973 return 0; 2974 2975 bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason); 2976 2977 conn->abort_reason = reason; 2978 2979 /* If the connection is pending check the command opcode since that 2980 * might be blocking on hci_cmd_sync_work while waiting its respective 2981 * event so we need to hci_cmd_sync_cancel to cancel it. 2982 * 2983 * hci_connect_le serializes the connection attempts so only one 2984 * connection can be in BT_CONNECT at time. 2985 */ 2986 if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) { 2987 switch (hci_skb_event(hdev->sent_cmd)) { 2988 case HCI_EV_CONN_COMPLETE: 2989 case HCI_EV_LE_CONN_COMPLETE: 2990 case HCI_EV_LE_ENHANCED_CONN_COMPLETE: 2991 case HCI_EVT_LE_CIS_ESTABLISHED: 2992 hci_cmd_sync_cancel(hdev, ECANCELED); 2993 break; 2994 } 2995 /* Cancel connect attempt if still queued/pending */ 2996 } else if (!hci_cancel_connect_sync(hdev, conn)) { 2997 return 0; 2998 } 2999 3000 /* Run immediately if on cmd_sync_work since this may be called 3001 * as a result to MGMT_OP_DISCONNECT/MGMT_OP_UNPAIR which does 3002 * already queue its callback on cmd_sync_work. 3003 */ 3004 return hci_cmd_sync_run_once(hdev, abort_conn_sync, conn, NULL); 3005 } 3006 3007 void hci_setup_tx_timestamp(struct sk_buff *skb, size_t key_offset, 3008 const struct sockcm_cookie *sockc) 3009 { 3010 struct sock *sk = skb ? skb->sk : NULL; 3011 int key; 3012 3013 /* This shall be called on a single skb of those generated by user 3014 * sendmsg(), and only when the sendmsg() does not return error to 3015 * user. This is required for keeping the tskey that increments here in 3016 * sync with possible sendmsg() counting by user. 3017 * 3018 * Stream sockets shall set key_offset to sendmsg() length in bytes 3019 * and call with the last fragment, others to 1 and first fragment. 3020 */ 3021 3022 if (!skb || !sockc || !sk || !key_offset) 3023 return; 3024 3025 sock_tx_timestamp(sk, sockc, &skb_shinfo(skb)->tx_flags); 3026 3027 if (sk->sk_type == SOCK_STREAM) 3028 key = atomic_add_return(key_offset, &sk->sk_tskey); 3029 3030 if (sockc->tsflags & SOF_TIMESTAMPING_OPT_ID && 3031 sockc->tsflags & SOF_TIMESTAMPING_TX_RECORD_MASK) { 3032 if (sockc->tsflags & SOCKCM_FLAG_TS_OPT_ID) { 3033 skb_shinfo(skb)->tskey = sockc->ts_opt_id; 3034 } else { 3035 if (sk->sk_type != SOCK_STREAM) 3036 key = atomic_inc_return(&sk->sk_tskey); 3037 skb_shinfo(skb)->tskey = key - 1; 3038 } 3039 } 3040 } 3041 3042 void hci_conn_tx_queue(struct hci_conn *conn, struct sk_buff *skb) 3043 { 3044 struct tx_queue *comp = &conn->tx_q; 3045 bool track = false; 3046 3047 /* Emit SND now, ie. just before sending to driver */ 3048 if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP) 3049 __skb_tstamp_tx(skb, NULL, NULL, skb->sk, SCM_TSTAMP_SND); 3050 3051 /* COMPLETION tstamp is emitted for tracked skb later in Number of 3052 * Completed Packets event. Available only for flow controlled cases. 3053 * 3054 * TODO: SCO support without flowctl (needs to be done in drivers) 3055 */ 3056 switch (conn->type) { 3057 case CIS_LINK: 3058 case BIS_LINK: 3059 case PA_LINK: 3060 case ACL_LINK: 3061 case LE_LINK: 3062 break; 3063 case SCO_LINK: 3064 case ESCO_LINK: 3065 if (!hci_dev_test_flag(conn->hdev, HCI_SCO_FLOWCTL)) 3066 return; 3067 break; 3068 default: 3069 return; 3070 } 3071 3072 if (skb->sk && (skb_shinfo(skb)->tx_flags & SKBTX_COMPLETION_TSTAMP)) 3073 track = true; 3074 3075 /* If nothing is tracked, just count extra skbs at the queue head */ 3076 if (!track && !comp->tracked) { 3077 comp->extra++; 3078 return; 3079 } 3080 3081 if (track) { 3082 skb = skb_clone_sk(skb); 3083 if (!skb) 3084 goto count_only; 3085 3086 comp->tracked++; 3087 } else { 3088 skb = skb_clone(skb, GFP_KERNEL); 3089 if (!skb) 3090 goto count_only; 3091 } 3092 3093 skb_queue_tail(&comp->queue, skb); 3094 return; 3095 3096 count_only: 3097 /* Stop tracking skbs, and only count. This will not emit timestamps for 3098 * the packets, but if we get here something is more seriously wrong. 3099 */ 3100 comp->tracked = 0; 3101 comp->extra += skb_queue_len(&comp->queue) + 1; 3102 skb_queue_purge(&comp->queue); 3103 } 3104 3105 void hci_conn_tx_dequeue(struct hci_conn *conn) 3106 { 3107 struct tx_queue *comp = &conn->tx_q; 3108 struct sk_buff *skb; 3109 3110 /* If there are tracked skbs, the counted extra go before dequeuing real 3111 * skbs, to keep ordering. When nothing is tracked, the ordering doesn't 3112 * matter so dequeue real skbs first to get rid of them ASAP. 3113 */ 3114 if (comp->extra && (comp->tracked || skb_queue_empty(&comp->queue))) { 3115 comp->extra--; 3116 return; 3117 } 3118 3119 skb = skb_dequeue(&comp->queue); 3120 if (!skb) 3121 return; 3122 3123 if (skb->sk) { 3124 comp->tracked--; 3125 __skb_tstamp_tx(skb, NULL, NULL, skb->sk, 3126 SCM_TSTAMP_COMPLETION); 3127 } 3128 3129 kfree_skb(skb); 3130 } 3131 3132 u8 *hci_conn_key_enc_size(struct hci_conn *conn) 3133 { 3134 if (conn->type == ACL_LINK) { 3135 struct link_key *key; 3136 3137 key = hci_find_link_key(conn->hdev, &conn->dst); 3138 if (!key) 3139 return NULL; 3140 3141 return &key->pin_len; 3142 } else if (conn->type == LE_LINK) { 3143 struct smp_ltk *ltk; 3144 3145 ltk = hci_find_ltk(conn->hdev, &conn->dst, conn->dst_type, 3146 conn->role); 3147 if (!ltk) 3148 return NULL; 3149 3150 return <k->enc_size; 3151 } 3152 3153 return NULL; 3154 } 3155 3156 int hci_ethtool_ts_info(unsigned int index, int sk_proto, 3157 struct kernel_ethtool_ts_info *info) 3158 { 3159 struct hci_dev *hdev; 3160 3161 hdev = hci_dev_get(index); 3162 if (!hdev) 3163 return -ENODEV; 3164 3165 info->so_timestamping = 3166 SOF_TIMESTAMPING_RX_SOFTWARE | 3167 SOF_TIMESTAMPING_SOFTWARE; 3168 info->phc_index = -1; 3169 info->tx_types = BIT(HWTSTAMP_TX_OFF); 3170 info->rx_filters = BIT(HWTSTAMP_FILTER_NONE); 3171 3172 switch (sk_proto) { 3173 case BTPROTO_ISO: 3174 case BTPROTO_L2CAP: 3175 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE; 3176 info->so_timestamping |= SOF_TIMESTAMPING_TX_COMPLETION; 3177 break; 3178 case BTPROTO_SCO: 3179 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE; 3180 if (hci_dev_test_flag(hdev, HCI_SCO_FLOWCTL)) 3181 info->so_timestamping |= SOF_TIMESTAMPING_TX_COMPLETION; 3182 break; 3183 } 3184 3185 hci_dev_put(hdev); 3186 return 0; 3187 } 3188