1 /* 2 BlueZ - Bluetooth protocol stack for Linux 3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved. 4 5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License version 2 as 9 published by the Free Software Foundation; 10 11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 22 SOFTWARE IS DISCLAIMED. 23 */ 24 25 /* Bluetooth HCI connection handling. */ 26 27 #include <linux/export.h> 28 #include <linux/debugfs.h> 29 30 #include <net/bluetooth/bluetooth.h> 31 #include <net/bluetooth/hci_core.h> 32 #include <net/bluetooth/l2cap.h> 33 34 #include "hci_request.h" 35 #include "smp.h" 36 #include "a2mp.h" 37 38 struct sco_param { 39 u16 pkt_type; 40 u16 max_latency; 41 u8 retrans_effort; 42 }; 43 44 static const struct sco_param esco_param_cvsd[] = { 45 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */ 46 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */ 47 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */ 48 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */ 49 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */ 50 }; 51 52 static const struct sco_param sco_param_cvsd[] = { 53 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */ 54 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */ 55 }; 56 57 static const struct sco_param esco_param_msbc[] = { 58 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */ 59 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */ 60 }; 61 62 /* This function requires the caller holds hdev->lock */ 63 static void hci_connect_le_scan_cleanup(struct hci_conn *conn) 64 { 65 struct hci_conn_params *params; 66 struct hci_dev *hdev = conn->hdev; 67 struct smp_irk *irk; 68 bdaddr_t *bdaddr; 69 u8 bdaddr_type; 70 71 bdaddr = &conn->dst; 72 bdaddr_type = conn->dst_type; 73 74 /* Check if we need to convert to identity address */ 75 irk = hci_get_irk(hdev, bdaddr, bdaddr_type); 76 if (irk) { 77 bdaddr = &irk->bdaddr; 78 bdaddr_type = irk->addr_type; 79 } 80 81 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr, 82 bdaddr_type); 83 if (!params || !params->explicit_connect) 84 return; 85 86 /* The connection attempt was doing scan for new RPA, and is 87 * in scan phase. If params are not associated with any other 88 * autoconnect action, remove them completely. If they are, just unmark 89 * them as waiting for connection, by clearing explicit_connect field. 90 */ 91 params->explicit_connect = false; 92 93 list_del_init(¶ms->action); 94 95 switch (params->auto_connect) { 96 case HCI_AUTO_CONN_EXPLICIT: 97 hci_conn_params_del(hdev, bdaddr, bdaddr_type); 98 /* return instead of break to avoid duplicate scan update */ 99 return; 100 case HCI_AUTO_CONN_DIRECT: 101 case HCI_AUTO_CONN_ALWAYS: 102 list_add(¶ms->action, &hdev->pend_le_conns); 103 break; 104 case HCI_AUTO_CONN_REPORT: 105 list_add(¶ms->action, &hdev->pend_le_reports); 106 break; 107 default: 108 break; 109 } 110 111 hci_update_passive_scan(hdev); 112 } 113 114 static void hci_conn_cleanup(struct hci_conn *conn) 115 { 116 struct hci_dev *hdev = conn->hdev; 117 118 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags)) 119 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type); 120 121 hci_chan_list_flush(conn); 122 123 hci_conn_hash_del(hdev, conn); 124 125 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) { 126 switch (conn->setting & SCO_AIRMODE_MASK) { 127 case SCO_AIRMODE_CVSD: 128 case SCO_AIRMODE_TRANSP: 129 if (hdev->notify) 130 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO); 131 break; 132 } 133 } else { 134 if (hdev->notify) 135 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL); 136 } 137 138 hci_conn_del_sysfs(conn); 139 140 debugfs_remove_recursive(conn->debugfs); 141 142 hci_dev_put(hdev); 143 144 hci_conn_put(conn); 145 } 146 147 static void le_scan_cleanup(struct work_struct *work) 148 { 149 struct hci_conn *conn = container_of(work, struct hci_conn, 150 le_scan_cleanup); 151 struct hci_dev *hdev = conn->hdev; 152 struct hci_conn *c = NULL; 153 154 BT_DBG("%s hcon %p", hdev->name, conn); 155 156 hci_dev_lock(hdev); 157 158 /* Check that the hci_conn is still around */ 159 rcu_read_lock(); 160 list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) { 161 if (c == conn) 162 break; 163 } 164 rcu_read_unlock(); 165 166 if (c == conn) { 167 hci_connect_le_scan_cleanup(conn); 168 hci_conn_cleanup(conn); 169 } 170 171 hci_dev_unlock(hdev); 172 hci_dev_put(hdev); 173 hci_conn_put(conn); 174 } 175 176 static void hci_connect_le_scan_remove(struct hci_conn *conn) 177 { 178 BT_DBG("%s hcon %p", conn->hdev->name, conn); 179 180 /* We can't call hci_conn_del/hci_conn_cleanup here since that 181 * could deadlock with another hci_conn_del() call that's holding 182 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work). 183 * Instead, grab temporary extra references to the hci_dev and 184 * hci_conn and perform the necessary cleanup in a separate work 185 * callback. 186 */ 187 188 hci_dev_hold(conn->hdev); 189 hci_conn_get(conn); 190 191 /* Even though we hold a reference to the hdev, many other 192 * things might get cleaned up meanwhile, including the hdev's 193 * own workqueue, so we can't use that for scheduling. 194 */ 195 schedule_work(&conn->le_scan_cleanup); 196 } 197 198 static void hci_acl_create_connection(struct hci_conn *conn) 199 { 200 struct hci_dev *hdev = conn->hdev; 201 struct inquiry_entry *ie; 202 struct hci_cp_create_conn cp; 203 204 BT_DBG("hcon %p", conn); 205 206 /* Many controllers disallow HCI Create Connection while it is doing 207 * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create 208 * Connection. This may cause the MGMT discovering state to become false 209 * without user space's request but it is okay since the MGMT Discovery 210 * APIs do not promise that discovery should be done forever. Instead, 211 * the user space monitors the status of MGMT discovering and it may 212 * request for discovery again when this flag becomes false. 213 */ 214 if (test_bit(HCI_INQUIRY, &hdev->flags)) { 215 /* Put this connection to "pending" state so that it will be 216 * executed after the inquiry cancel command complete event. 217 */ 218 conn->state = BT_CONNECT2; 219 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL); 220 return; 221 } 222 223 conn->state = BT_CONNECT; 224 conn->out = true; 225 conn->role = HCI_ROLE_MASTER; 226 227 conn->attempt++; 228 229 conn->link_policy = hdev->link_policy; 230 231 memset(&cp, 0, sizeof(cp)); 232 bacpy(&cp.bdaddr, &conn->dst); 233 cp.pscan_rep_mode = 0x02; 234 235 ie = hci_inquiry_cache_lookup(hdev, &conn->dst); 236 if (ie) { 237 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) { 238 cp.pscan_rep_mode = ie->data.pscan_rep_mode; 239 cp.pscan_mode = ie->data.pscan_mode; 240 cp.clock_offset = ie->data.clock_offset | 241 cpu_to_le16(0x8000); 242 } 243 244 memcpy(conn->dev_class, ie->data.dev_class, 3); 245 } 246 247 cp.pkt_type = cpu_to_le16(conn->pkt_type); 248 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER)) 249 cp.role_switch = 0x01; 250 else 251 cp.role_switch = 0x00; 252 253 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp); 254 } 255 256 int hci_disconnect(struct hci_conn *conn, __u8 reason) 257 { 258 BT_DBG("hcon %p", conn); 259 260 /* When we are central of an established connection and it enters 261 * the disconnect timeout, then go ahead and try to read the 262 * current clock offset. Processing of the result is done 263 * within the event handling and hci_clock_offset_evt function. 264 */ 265 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER && 266 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) { 267 struct hci_dev *hdev = conn->hdev; 268 struct hci_cp_read_clock_offset clkoff_cp; 269 270 clkoff_cp.handle = cpu_to_le16(conn->handle); 271 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp), 272 &clkoff_cp); 273 } 274 275 return hci_abort_conn(conn, reason); 276 } 277 278 static void hci_add_sco(struct hci_conn *conn, __u16 handle) 279 { 280 struct hci_dev *hdev = conn->hdev; 281 struct hci_cp_add_sco cp; 282 283 BT_DBG("hcon %p", conn); 284 285 conn->state = BT_CONNECT; 286 conn->out = true; 287 288 conn->attempt++; 289 290 cp.handle = cpu_to_le16(handle); 291 cp.pkt_type = cpu_to_le16(conn->pkt_type); 292 293 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp); 294 } 295 296 static bool find_next_esco_param(struct hci_conn *conn, 297 const struct sco_param *esco_param, int size) 298 { 299 for (; conn->attempt <= size; conn->attempt++) { 300 if (lmp_esco_2m_capable(conn->link) || 301 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3)) 302 break; 303 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported", 304 conn, conn->attempt); 305 } 306 307 return conn->attempt <= size; 308 } 309 310 static bool hci_enhanced_setup_sync_conn(struct hci_conn *conn, __u16 handle) 311 { 312 struct hci_dev *hdev = conn->hdev; 313 struct hci_cp_enhanced_setup_sync_conn cp; 314 const struct sco_param *param; 315 316 bt_dev_dbg(hdev, "hcon %p", conn); 317 318 /* for offload use case, codec needs to configured before opening SCO */ 319 if (conn->codec.data_path) 320 hci_req_configure_datapath(hdev, &conn->codec); 321 322 conn->state = BT_CONNECT; 323 conn->out = true; 324 325 conn->attempt++; 326 327 memset(&cp, 0x00, sizeof(cp)); 328 329 cp.handle = cpu_to_le16(handle); 330 331 cp.tx_bandwidth = cpu_to_le32(0x00001f40); 332 cp.rx_bandwidth = cpu_to_le32(0x00001f40); 333 334 switch (conn->codec.id) { 335 case BT_CODEC_MSBC: 336 if (!find_next_esco_param(conn, esco_param_msbc, 337 ARRAY_SIZE(esco_param_msbc))) 338 return false; 339 340 param = &esco_param_msbc[conn->attempt - 1]; 341 cp.tx_coding_format.id = 0x05; 342 cp.rx_coding_format.id = 0x05; 343 cp.tx_codec_frame_size = __cpu_to_le16(60); 344 cp.rx_codec_frame_size = __cpu_to_le16(60); 345 cp.in_bandwidth = __cpu_to_le32(32000); 346 cp.out_bandwidth = __cpu_to_le32(32000); 347 cp.in_coding_format.id = 0x04; 348 cp.out_coding_format.id = 0x04; 349 cp.in_coded_data_size = __cpu_to_le16(16); 350 cp.out_coded_data_size = __cpu_to_le16(16); 351 cp.in_pcm_data_format = 2; 352 cp.out_pcm_data_format = 2; 353 cp.in_pcm_sample_payload_msb_pos = 0; 354 cp.out_pcm_sample_payload_msb_pos = 0; 355 cp.in_data_path = conn->codec.data_path; 356 cp.out_data_path = conn->codec.data_path; 357 cp.in_transport_unit_size = 1; 358 cp.out_transport_unit_size = 1; 359 break; 360 361 case BT_CODEC_TRANSPARENT: 362 if (!find_next_esco_param(conn, esco_param_msbc, 363 ARRAY_SIZE(esco_param_msbc))) 364 return false; 365 param = &esco_param_msbc[conn->attempt - 1]; 366 cp.tx_coding_format.id = 0x03; 367 cp.rx_coding_format.id = 0x03; 368 cp.tx_codec_frame_size = __cpu_to_le16(60); 369 cp.rx_codec_frame_size = __cpu_to_le16(60); 370 cp.in_bandwidth = __cpu_to_le32(0x1f40); 371 cp.out_bandwidth = __cpu_to_le32(0x1f40); 372 cp.in_coding_format.id = 0x03; 373 cp.out_coding_format.id = 0x03; 374 cp.in_coded_data_size = __cpu_to_le16(16); 375 cp.out_coded_data_size = __cpu_to_le16(16); 376 cp.in_pcm_data_format = 2; 377 cp.out_pcm_data_format = 2; 378 cp.in_pcm_sample_payload_msb_pos = 0; 379 cp.out_pcm_sample_payload_msb_pos = 0; 380 cp.in_data_path = conn->codec.data_path; 381 cp.out_data_path = conn->codec.data_path; 382 cp.in_transport_unit_size = 1; 383 cp.out_transport_unit_size = 1; 384 break; 385 386 case BT_CODEC_CVSD: 387 if (lmp_esco_capable(conn->link)) { 388 if (!find_next_esco_param(conn, esco_param_cvsd, 389 ARRAY_SIZE(esco_param_cvsd))) 390 return false; 391 param = &esco_param_cvsd[conn->attempt - 1]; 392 } else { 393 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd)) 394 return false; 395 param = &sco_param_cvsd[conn->attempt - 1]; 396 } 397 cp.tx_coding_format.id = 2; 398 cp.rx_coding_format.id = 2; 399 cp.tx_codec_frame_size = __cpu_to_le16(60); 400 cp.rx_codec_frame_size = __cpu_to_le16(60); 401 cp.in_bandwidth = __cpu_to_le32(16000); 402 cp.out_bandwidth = __cpu_to_le32(16000); 403 cp.in_coding_format.id = 4; 404 cp.out_coding_format.id = 4; 405 cp.in_coded_data_size = __cpu_to_le16(16); 406 cp.out_coded_data_size = __cpu_to_le16(16); 407 cp.in_pcm_data_format = 2; 408 cp.out_pcm_data_format = 2; 409 cp.in_pcm_sample_payload_msb_pos = 0; 410 cp.out_pcm_sample_payload_msb_pos = 0; 411 cp.in_data_path = conn->codec.data_path; 412 cp.out_data_path = conn->codec.data_path; 413 cp.in_transport_unit_size = 16; 414 cp.out_transport_unit_size = 16; 415 break; 416 default: 417 return false; 418 } 419 420 cp.retrans_effort = param->retrans_effort; 421 cp.pkt_type = __cpu_to_le16(param->pkt_type); 422 cp.max_latency = __cpu_to_le16(param->max_latency); 423 424 if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0) 425 return false; 426 427 return true; 428 } 429 430 static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle) 431 { 432 struct hci_dev *hdev = conn->hdev; 433 struct hci_cp_setup_sync_conn cp; 434 const struct sco_param *param; 435 436 bt_dev_dbg(hdev, "hcon %p", conn); 437 438 conn->state = BT_CONNECT; 439 conn->out = true; 440 441 conn->attempt++; 442 443 cp.handle = cpu_to_le16(handle); 444 445 cp.tx_bandwidth = cpu_to_le32(0x00001f40); 446 cp.rx_bandwidth = cpu_to_le32(0x00001f40); 447 cp.voice_setting = cpu_to_le16(conn->setting); 448 449 switch (conn->setting & SCO_AIRMODE_MASK) { 450 case SCO_AIRMODE_TRANSP: 451 if (!find_next_esco_param(conn, esco_param_msbc, 452 ARRAY_SIZE(esco_param_msbc))) 453 return false; 454 param = &esco_param_msbc[conn->attempt - 1]; 455 break; 456 case SCO_AIRMODE_CVSD: 457 if (lmp_esco_capable(conn->link)) { 458 if (!find_next_esco_param(conn, esco_param_cvsd, 459 ARRAY_SIZE(esco_param_cvsd))) 460 return false; 461 param = &esco_param_cvsd[conn->attempt - 1]; 462 } else { 463 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd)) 464 return false; 465 param = &sco_param_cvsd[conn->attempt - 1]; 466 } 467 break; 468 default: 469 return false; 470 } 471 472 cp.retrans_effort = param->retrans_effort; 473 cp.pkt_type = __cpu_to_le16(param->pkt_type); 474 cp.max_latency = __cpu_to_le16(param->max_latency); 475 476 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0) 477 return false; 478 479 return true; 480 } 481 482 bool hci_setup_sync(struct hci_conn *conn, __u16 handle) 483 { 484 if (enhanced_sco_capable(conn->hdev)) 485 return hci_enhanced_setup_sync_conn(conn, handle); 486 487 return hci_setup_sync_conn(conn, handle); 488 } 489 490 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency, 491 u16 to_multiplier) 492 { 493 struct hci_dev *hdev = conn->hdev; 494 struct hci_conn_params *params; 495 struct hci_cp_le_conn_update cp; 496 497 hci_dev_lock(hdev); 498 499 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type); 500 if (params) { 501 params->conn_min_interval = min; 502 params->conn_max_interval = max; 503 params->conn_latency = latency; 504 params->supervision_timeout = to_multiplier; 505 } 506 507 hci_dev_unlock(hdev); 508 509 memset(&cp, 0, sizeof(cp)); 510 cp.handle = cpu_to_le16(conn->handle); 511 cp.conn_interval_min = cpu_to_le16(min); 512 cp.conn_interval_max = cpu_to_le16(max); 513 cp.conn_latency = cpu_to_le16(latency); 514 cp.supervision_timeout = cpu_to_le16(to_multiplier); 515 cp.min_ce_len = cpu_to_le16(0x0000); 516 cp.max_ce_len = cpu_to_le16(0x0000); 517 518 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp); 519 520 if (params) 521 return 0x01; 522 523 return 0x00; 524 } 525 526 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand, 527 __u8 ltk[16], __u8 key_size) 528 { 529 struct hci_dev *hdev = conn->hdev; 530 struct hci_cp_le_start_enc cp; 531 532 BT_DBG("hcon %p", conn); 533 534 memset(&cp, 0, sizeof(cp)); 535 536 cp.handle = cpu_to_le16(conn->handle); 537 cp.rand = rand; 538 cp.ediv = ediv; 539 memcpy(cp.ltk, ltk, key_size); 540 541 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp); 542 } 543 544 /* Device _must_ be locked */ 545 void hci_sco_setup(struct hci_conn *conn, __u8 status) 546 { 547 struct hci_conn *sco = conn->link; 548 549 if (!sco) 550 return; 551 552 BT_DBG("hcon %p", conn); 553 554 if (!status) { 555 if (lmp_esco_capable(conn->hdev)) 556 hci_setup_sync(sco, conn->handle); 557 else 558 hci_add_sco(sco, conn->handle); 559 } else { 560 hci_connect_cfm(sco, status); 561 hci_conn_del(sco); 562 } 563 } 564 565 static void hci_conn_timeout(struct work_struct *work) 566 { 567 struct hci_conn *conn = container_of(work, struct hci_conn, 568 disc_work.work); 569 int refcnt = atomic_read(&conn->refcnt); 570 571 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state)); 572 573 WARN_ON(refcnt < 0); 574 575 /* FIXME: It was observed that in pairing failed scenario, refcnt 576 * drops below 0. Probably this is because l2cap_conn_del calls 577 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is 578 * dropped. After that loop hci_chan_del is called which also drops 579 * conn. For now make sure that ACL is alive if refcnt is higher then 0, 580 * otherwise drop it. 581 */ 582 if (refcnt > 0) 583 return; 584 585 /* LE connections in scanning state need special handling */ 586 if (conn->state == BT_CONNECT && conn->type == LE_LINK && 587 test_bit(HCI_CONN_SCANNING, &conn->flags)) { 588 hci_connect_le_scan_remove(conn); 589 return; 590 } 591 592 hci_abort_conn(conn, hci_proto_disconn_ind(conn)); 593 } 594 595 /* Enter sniff mode */ 596 static void hci_conn_idle(struct work_struct *work) 597 { 598 struct hci_conn *conn = container_of(work, struct hci_conn, 599 idle_work.work); 600 struct hci_dev *hdev = conn->hdev; 601 602 BT_DBG("hcon %p mode %d", conn, conn->mode); 603 604 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn)) 605 return; 606 607 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF)) 608 return; 609 610 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) { 611 struct hci_cp_sniff_subrate cp; 612 cp.handle = cpu_to_le16(conn->handle); 613 cp.max_latency = cpu_to_le16(0); 614 cp.min_remote_timeout = cpu_to_le16(0); 615 cp.min_local_timeout = cpu_to_le16(0); 616 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp); 617 } 618 619 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { 620 struct hci_cp_sniff_mode cp; 621 cp.handle = cpu_to_le16(conn->handle); 622 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval); 623 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval); 624 cp.attempt = cpu_to_le16(4); 625 cp.timeout = cpu_to_le16(1); 626 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp); 627 } 628 } 629 630 static void hci_conn_auto_accept(struct work_struct *work) 631 { 632 struct hci_conn *conn = container_of(work, struct hci_conn, 633 auto_accept_work.work); 634 635 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst), 636 &conn->dst); 637 } 638 639 static void le_disable_advertising(struct hci_dev *hdev) 640 { 641 if (ext_adv_capable(hdev)) { 642 struct hci_cp_le_set_ext_adv_enable cp; 643 644 cp.enable = 0x00; 645 cp.num_of_sets = 0x00; 646 647 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp), 648 &cp); 649 } else { 650 u8 enable = 0x00; 651 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), 652 &enable); 653 } 654 } 655 656 static void le_conn_timeout(struct work_struct *work) 657 { 658 struct hci_conn *conn = container_of(work, struct hci_conn, 659 le_conn_timeout.work); 660 struct hci_dev *hdev = conn->hdev; 661 662 BT_DBG(""); 663 664 /* We could end up here due to having done directed advertising, 665 * so clean up the state if necessary. This should however only 666 * happen with broken hardware or if low duty cycle was used 667 * (which doesn't have a timeout of its own). 668 */ 669 if (conn->role == HCI_ROLE_SLAVE) { 670 /* Disable LE Advertising */ 671 le_disable_advertising(hdev); 672 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT); 673 return; 674 } 675 676 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM); 677 } 678 679 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst, 680 u8 role) 681 { 682 struct hci_conn *conn; 683 684 BT_DBG("%s dst %pMR", hdev->name, dst); 685 686 conn = kzalloc(sizeof(*conn), GFP_KERNEL); 687 if (!conn) 688 return NULL; 689 690 bacpy(&conn->dst, dst); 691 bacpy(&conn->src, &hdev->bdaddr); 692 conn->hdev = hdev; 693 conn->type = type; 694 conn->role = role; 695 conn->mode = HCI_CM_ACTIVE; 696 conn->state = BT_OPEN; 697 conn->auth_type = HCI_AT_GENERAL_BONDING; 698 conn->io_capability = hdev->io_capability; 699 conn->remote_auth = 0xff; 700 conn->key_type = 0xff; 701 conn->rssi = HCI_RSSI_INVALID; 702 conn->tx_power = HCI_TX_POWER_INVALID; 703 conn->max_tx_power = HCI_TX_POWER_INVALID; 704 705 set_bit(HCI_CONN_POWER_SAVE, &conn->flags); 706 conn->disc_timeout = HCI_DISCONN_TIMEOUT; 707 708 /* Set Default Authenticated payload timeout to 30s */ 709 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT; 710 711 if (conn->role == HCI_ROLE_MASTER) 712 conn->out = true; 713 714 switch (type) { 715 case ACL_LINK: 716 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK; 717 break; 718 case LE_LINK: 719 /* conn->src should reflect the local identity address */ 720 hci_copy_identity_address(hdev, &conn->src, &conn->src_type); 721 break; 722 case SCO_LINK: 723 if (lmp_esco_capable(hdev)) 724 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) | 725 (hdev->esco_type & EDR_ESCO_MASK); 726 else 727 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK; 728 break; 729 case ESCO_LINK: 730 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK; 731 break; 732 } 733 734 skb_queue_head_init(&conn->data_q); 735 736 INIT_LIST_HEAD(&conn->chan_list); 737 738 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout); 739 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept); 740 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle); 741 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout); 742 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup); 743 744 atomic_set(&conn->refcnt, 0); 745 746 hci_dev_hold(hdev); 747 748 hci_conn_hash_add(hdev, conn); 749 750 /* The SCO and eSCO connections will only be notified when their 751 * setup has been completed. This is different to ACL links which 752 * can be notified right away. 753 */ 754 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) { 755 if (hdev->notify) 756 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD); 757 } 758 759 hci_conn_init_sysfs(conn); 760 761 return conn; 762 } 763 764 int hci_conn_del(struct hci_conn *conn) 765 { 766 struct hci_dev *hdev = conn->hdev; 767 768 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle); 769 770 cancel_delayed_work_sync(&conn->disc_work); 771 cancel_delayed_work_sync(&conn->auto_accept_work); 772 cancel_delayed_work_sync(&conn->idle_work); 773 774 if (conn->type == ACL_LINK) { 775 struct hci_conn *sco = conn->link; 776 if (sco) 777 sco->link = NULL; 778 779 /* Unacked frames */ 780 hdev->acl_cnt += conn->sent; 781 } else if (conn->type == LE_LINK) { 782 cancel_delayed_work(&conn->le_conn_timeout); 783 784 if (hdev->le_pkts) 785 hdev->le_cnt += conn->sent; 786 else 787 hdev->acl_cnt += conn->sent; 788 } else { 789 struct hci_conn *acl = conn->link; 790 if (acl) { 791 acl->link = NULL; 792 hci_conn_drop(acl); 793 } 794 } 795 796 if (conn->amp_mgr) 797 amp_mgr_put(conn->amp_mgr); 798 799 skb_queue_purge(&conn->data_q); 800 801 /* Remove the connection from the list and cleanup its remaining 802 * state. This is a separate function since for some cases like 803 * BT_CONNECT_SCAN we *only* want the cleanup part without the 804 * rest of hci_conn_del. 805 */ 806 hci_conn_cleanup(conn); 807 808 return 0; 809 } 810 811 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type) 812 { 813 int use_src = bacmp(src, BDADDR_ANY); 814 struct hci_dev *hdev = NULL, *d; 815 816 BT_DBG("%pMR -> %pMR", src, dst); 817 818 read_lock(&hci_dev_list_lock); 819 820 list_for_each_entry(d, &hci_dev_list, list) { 821 if (!test_bit(HCI_UP, &d->flags) || 822 hci_dev_test_flag(d, HCI_USER_CHANNEL) || 823 d->dev_type != HCI_PRIMARY) 824 continue; 825 826 /* Simple routing: 827 * No source address - find interface with bdaddr != dst 828 * Source address - find interface with bdaddr == src 829 */ 830 831 if (use_src) { 832 bdaddr_t id_addr; 833 u8 id_addr_type; 834 835 if (src_type == BDADDR_BREDR) { 836 if (!lmp_bredr_capable(d)) 837 continue; 838 bacpy(&id_addr, &d->bdaddr); 839 id_addr_type = BDADDR_BREDR; 840 } else { 841 if (!lmp_le_capable(d)) 842 continue; 843 844 hci_copy_identity_address(d, &id_addr, 845 &id_addr_type); 846 847 /* Convert from HCI to three-value type */ 848 if (id_addr_type == ADDR_LE_DEV_PUBLIC) 849 id_addr_type = BDADDR_LE_PUBLIC; 850 else 851 id_addr_type = BDADDR_LE_RANDOM; 852 } 853 854 if (!bacmp(&id_addr, src) && id_addr_type == src_type) { 855 hdev = d; break; 856 } 857 } else { 858 if (bacmp(&d->bdaddr, dst)) { 859 hdev = d; break; 860 } 861 } 862 } 863 864 if (hdev) 865 hdev = hci_dev_hold(hdev); 866 867 read_unlock(&hci_dev_list_lock); 868 return hdev; 869 } 870 EXPORT_SYMBOL(hci_get_route); 871 872 /* This function requires the caller holds hdev->lock */ 873 void hci_le_conn_failed(struct hci_conn *conn, u8 status) 874 { 875 struct hci_dev *hdev = conn->hdev; 876 struct hci_conn_params *params; 877 878 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst, 879 conn->dst_type); 880 if (params && params->conn) { 881 hci_conn_drop(params->conn); 882 hci_conn_put(params->conn); 883 params->conn = NULL; 884 } 885 886 conn->state = BT_CLOSED; 887 888 /* If the status indicates successful cancellation of 889 * the attempt (i.e. Unknown Connection Id) there's no point of 890 * notifying failure since we'll go back to keep trying to 891 * connect. The only exception is explicit connect requests 892 * where a timeout + cancel does indicate an actual failure. 893 */ 894 if (status != HCI_ERROR_UNKNOWN_CONN_ID || 895 (params && params->explicit_connect)) 896 mgmt_connect_failed(hdev, &conn->dst, conn->type, 897 conn->dst_type, status); 898 899 hci_connect_cfm(conn, status); 900 901 hci_conn_del(conn); 902 903 /* Since we may have temporarily stopped the background scanning in 904 * favor of connection establishment, we should restart it. 905 */ 906 hci_update_passive_scan(hdev); 907 908 /* Enable advertising in case this was a failed connection 909 * attempt as a peripheral. 910 */ 911 hci_enable_advertising(hdev); 912 } 913 914 static void create_le_conn_complete(struct hci_dev *hdev, void *data, int err) 915 { 916 struct hci_conn *conn = data; 917 918 hci_dev_lock(hdev); 919 920 if (!err) { 921 hci_connect_le_scan_cleanup(conn); 922 goto done; 923 } 924 925 bt_dev_err(hdev, "request failed to create LE connection: err %d", err); 926 927 if (!conn) 928 goto done; 929 930 hci_le_conn_failed(conn, err); 931 932 done: 933 hci_dev_unlock(hdev); 934 } 935 936 static int hci_connect_le_sync(struct hci_dev *hdev, void *data) 937 { 938 struct hci_conn *conn = data; 939 940 bt_dev_dbg(hdev, "conn %p", conn); 941 942 return hci_le_create_conn_sync(hdev, conn); 943 } 944 945 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst, 946 u8 dst_type, bool dst_resolved, u8 sec_level, 947 u16 conn_timeout, u8 role) 948 { 949 struct hci_conn *conn; 950 struct smp_irk *irk; 951 int err; 952 953 /* Let's make sure that le is enabled.*/ 954 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 955 if (lmp_le_capable(hdev)) 956 return ERR_PTR(-ECONNREFUSED); 957 958 return ERR_PTR(-EOPNOTSUPP); 959 } 960 961 /* Since the controller supports only one LE connection attempt at a 962 * time, we return -EBUSY if there is any connection attempt running. 963 */ 964 if (hci_lookup_le_connect(hdev)) 965 return ERR_PTR(-EBUSY); 966 967 /* If there's already a connection object but it's not in 968 * scanning state it means it must already be established, in 969 * which case we can't do anything else except report a failure 970 * to connect. 971 */ 972 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type); 973 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) { 974 return ERR_PTR(-EBUSY); 975 } 976 977 /* Check if the destination address has been resolved by the controller 978 * since if it did then the identity address shall be used. 979 */ 980 if (!dst_resolved) { 981 /* When given an identity address with existing identity 982 * resolving key, the connection needs to be established 983 * to a resolvable random address. 984 * 985 * Storing the resolvable random address is required here 986 * to handle connection failures. The address will later 987 * be resolved back into the original identity address 988 * from the connect request. 989 */ 990 irk = hci_find_irk_by_addr(hdev, dst, dst_type); 991 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) { 992 dst = &irk->rpa; 993 dst_type = ADDR_LE_DEV_RANDOM; 994 } 995 } 996 997 if (conn) { 998 bacpy(&conn->dst, dst); 999 } else { 1000 conn = hci_conn_add(hdev, LE_LINK, dst, role); 1001 if (!conn) 1002 return ERR_PTR(-ENOMEM); 1003 hci_conn_hold(conn); 1004 conn->pending_sec_level = sec_level; 1005 } 1006 1007 conn->dst_type = dst_type; 1008 conn->sec_level = BT_SECURITY_LOW; 1009 conn->conn_timeout = conn_timeout; 1010 1011 conn->state = BT_CONNECT; 1012 clear_bit(HCI_CONN_SCANNING, &conn->flags); 1013 1014 err = hci_cmd_sync_queue(hdev, hci_connect_le_sync, conn, 1015 create_le_conn_complete); 1016 if (err) { 1017 hci_conn_del(conn); 1018 return ERR_PTR(err); 1019 } 1020 1021 return conn; 1022 } 1023 1024 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type) 1025 { 1026 struct hci_conn *conn; 1027 1028 conn = hci_conn_hash_lookup_le(hdev, addr, type); 1029 if (!conn) 1030 return false; 1031 1032 if (conn->state != BT_CONNECTED) 1033 return false; 1034 1035 return true; 1036 } 1037 1038 /* This function requires the caller holds hdev->lock */ 1039 static int hci_explicit_conn_params_set(struct hci_dev *hdev, 1040 bdaddr_t *addr, u8 addr_type) 1041 { 1042 struct hci_conn_params *params; 1043 1044 if (is_connected(hdev, addr, addr_type)) 1045 return -EISCONN; 1046 1047 params = hci_conn_params_lookup(hdev, addr, addr_type); 1048 if (!params) { 1049 params = hci_conn_params_add(hdev, addr, addr_type); 1050 if (!params) 1051 return -ENOMEM; 1052 1053 /* If we created new params, mark them to be deleted in 1054 * hci_connect_le_scan_cleanup. It's different case than 1055 * existing disabled params, those will stay after cleanup. 1056 */ 1057 params->auto_connect = HCI_AUTO_CONN_EXPLICIT; 1058 } 1059 1060 /* We're trying to connect, so make sure params are at pend_le_conns */ 1061 if (params->auto_connect == HCI_AUTO_CONN_DISABLED || 1062 params->auto_connect == HCI_AUTO_CONN_REPORT || 1063 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) { 1064 list_del_init(¶ms->action); 1065 list_add(¶ms->action, &hdev->pend_le_conns); 1066 } 1067 1068 params->explicit_connect = true; 1069 1070 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type, 1071 params->auto_connect); 1072 1073 return 0; 1074 } 1075 1076 /* This function requires the caller holds hdev->lock */ 1077 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst, 1078 u8 dst_type, u8 sec_level, 1079 u16 conn_timeout, 1080 enum conn_reasons conn_reason) 1081 { 1082 struct hci_conn *conn; 1083 1084 /* Let's make sure that le is enabled.*/ 1085 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) { 1086 if (lmp_le_capable(hdev)) 1087 return ERR_PTR(-ECONNREFUSED); 1088 1089 return ERR_PTR(-EOPNOTSUPP); 1090 } 1091 1092 /* Some devices send ATT messages as soon as the physical link is 1093 * established. To be able to handle these ATT messages, the user- 1094 * space first establishes the connection and then starts the pairing 1095 * process. 1096 * 1097 * So if a hci_conn object already exists for the following connection 1098 * attempt, we simply update pending_sec_level and auth_type fields 1099 * and return the object found. 1100 */ 1101 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type); 1102 if (conn) { 1103 if (conn->pending_sec_level < sec_level) 1104 conn->pending_sec_level = sec_level; 1105 goto done; 1106 } 1107 1108 BT_DBG("requesting refresh of dst_addr"); 1109 1110 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER); 1111 if (!conn) 1112 return ERR_PTR(-ENOMEM); 1113 1114 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) { 1115 hci_conn_del(conn); 1116 return ERR_PTR(-EBUSY); 1117 } 1118 1119 conn->state = BT_CONNECT; 1120 set_bit(HCI_CONN_SCANNING, &conn->flags); 1121 conn->dst_type = dst_type; 1122 conn->sec_level = BT_SECURITY_LOW; 1123 conn->pending_sec_level = sec_level; 1124 conn->conn_timeout = conn_timeout; 1125 conn->conn_reason = conn_reason; 1126 1127 hci_update_passive_scan(hdev); 1128 1129 done: 1130 hci_conn_hold(conn); 1131 return conn; 1132 } 1133 1134 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst, 1135 u8 sec_level, u8 auth_type, 1136 enum conn_reasons conn_reason) 1137 { 1138 struct hci_conn *acl; 1139 1140 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) { 1141 if (lmp_bredr_capable(hdev)) 1142 return ERR_PTR(-ECONNREFUSED); 1143 1144 return ERR_PTR(-EOPNOTSUPP); 1145 } 1146 1147 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst); 1148 if (!acl) { 1149 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER); 1150 if (!acl) 1151 return ERR_PTR(-ENOMEM); 1152 } 1153 1154 hci_conn_hold(acl); 1155 1156 acl->conn_reason = conn_reason; 1157 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) { 1158 acl->sec_level = BT_SECURITY_LOW; 1159 acl->pending_sec_level = sec_level; 1160 acl->auth_type = auth_type; 1161 hci_acl_create_connection(acl); 1162 } 1163 1164 return acl; 1165 } 1166 1167 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst, 1168 __u16 setting, struct bt_codec *codec) 1169 { 1170 struct hci_conn *acl; 1171 struct hci_conn *sco; 1172 1173 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING, 1174 CONN_REASON_SCO_CONNECT); 1175 if (IS_ERR(acl)) 1176 return acl; 1177 1178 sco = hci_conn_hash_lookup_ba(hdev, type, dst); 1179 if (!sco) { 1180 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER); 1181 if (!sco) { 1182 hci_conn_drop(acl); 1183 return ERR_PTR(-ENOMEM); 1184 } 1185 } 1186 1187 acl->link = sco; 1188 sco->link = acl; 1189 1190 hci_conn_hold(sco); 1191 1192 sco->setting = setting; 1193 sco->codec = *codec; 1194 1195 if (acl->state == BT_CONNECTED && 1196 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) { 1197 set_bit(HCI_CONN_POWER_SAVE, &acl->flags); 1198 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON); 1199 1200 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) { 1201 /* defer SCO setup until mode change completed */ 1202 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags); 1203 return sco; 1204 } 1205 1206 hci_sco_setup(acl, 0x00); 1207 } 1208 1209 return sco; 1210 } 1211 1212 /* Check link security requirement */ 1213 int hci_conn_check_link_mode(struct hci_conn *conn) 1214 { 1215 BT_DBG("hcon %p", conn); 1216 1217 /* In Secure Connections Only mode, it is required that Secure 1218 * Connections is used and the link is encrypted with AES-CCM 1219 * using a P-256 authenticated combination key. 1220 */ 1221 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) { 1222 if (!hci_conn_sc_enabled(conn) || 1223 !test_bit(HCI_CONN_AES_CCM, &conn->flags) || 1224 conn->key_type != HCI_LK_AUTH_COMBINATION_P256) 1225 return 0; 1226 } 1227 1228 /* AES encryption is required for Level 4: 1229 * 1230 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C 1231 * page 1319: 1232 * 1233 * 128-bit equivalent strength for link and encryption keys 1234 * required using FIPS approved algorithms (E0 not allowed, 1235 * SAFER+ not allowed, and P-192 not allowed; encryption key 1236 * not shortened) 1237 */ 1238 if (conn->sec_level == BT_SECURITY_FIPS && 1239 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) { 1240 bt_dev_err(conn->hdev, 1241 "Invalid security: Missing AES-CCM usage"); 1242 return 0; 1243 } 1244 1245 if (hci_conn_ssp_enabled(conn) && 1246 !test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 1247 return 0; 1248 1249 return 1; 1250 } 1251 1252 /* Authenticate remote device */ 1253 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type) 1254 { 1255 BT_DBG("hcon %p", conn); 1256 1257 if (conn->pending_sec_level > sec_level) 1258 sec_level = conn->pending_sec_level; 1259 1260 if (sec_level > conn->sec_level) 1261 conn->pending_sec_level = sec_level; 1262 else if (test_bit(HCI_CONN_AUTH, &conn->flags)) 1263 return 1; 1264 1265 /* Make sure we preserve an existing MITM requirement*/ 1266 auth_type |= (conn->auth_type & 0x01); 1267 1268 conn->auth_type = auth_type; 1269 1270 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) { 1271 struct hci_cp_auth_requested cp; 1272 1273 cp.handle = cpu_to_le16(conn->handle); 1274 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED, 1275 sizeof(cp), &cp); 1276 1277 /* If we're already encrypted set the REAUTH_PEND flag, 1278 * otherwise set the ENCRYPT_PEND. 1279 */ 1280 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 1281 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags); 1282 else 1283 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags); 1284 } 1285 1286 return 0; 1287 } 1288 1289 /* Encrypt the link */ 1290 static void hci_conn_encrypt(struct hci_conn *conn) 1291 { 1292 BT_DBG("hcon %p", conn); 1293 1294 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) { 1295 struct hci_cp_set_conn_encrypt cp; 1296 cp.handle = cpu_to_le16(conn->handle); 1297 cp.encrypt = 0x01; 1298 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp), 1299 &cp); 1300 } 1301 } 1302 1303 /* Enable security */ 1304 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type, 1305 bool initiator) 1306 { 1307 BT_DBG("hcon %p", conn); 1308 1309 if (conn->type == LE_LINK) 1310 return smp_conn_security(conn, sec_level); 1311 1312 /* For sdp we don't need the link key. */ 1313 if (sec_level == BT_SECURITY_SDP) 1314 return 1; 1315 1316 /* For non 2.1 devices and low security level we don't need the link 1317 key. */ 1318 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn)) 1319 return 1; 1320 1321 /* For other security levels we need the link key. */ 1322 if (!test_bit(HCI_CONN_AUTH, &conn->flags)) 1323 goto auth; 1324 1325 /* An authenticated FIPS approved combination key has sufficient 1326 * security for security level 4. */ 1327 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 && 1328 sec_level == BT_SECURITY_FIPS) 1329 goto encrypt; 1330 1331 /* An authenticated combination key has sufficient security for 1332 security level 3. */ 1333 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 || 1334 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) && 1335 sec_level == BT_SECURITY_HIGH) 1336 goto encrypt; 1337 1338 /* An unauthenticated combination key has sufficient security for 1339 security level 1 and 2. */ 1340 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 || 1341 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) && 1342 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW)) 1343 goto encrypt; 1344 1345 /* A combination key has always sufficient security for the security 1346 levels 1 or 2. High security level requires the combination key 1347 is generated using maximum PIN code length (16). 1348 For pre 2.1 units. */ 1349 if (conn->key_type == HCI_LK_COMBINATION && 1350 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW || 1351 conn->pin_length == 16)) 1352 goto encrypt; 1353 1354 auth: 1355 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) 1356 return 0; 1357 1358 if (initiator) 1359 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags); 1360 1361 if (!hci_conn_auth(conn, sec_level, auth_type)) 1362 return 0; 1363 1364 encrypt: 1365 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) { 1366 /* Ensure that the encryption key size has been read, 1367 * otherwise stall the upper layer responses. 1368 */ 1369 if (!conn->enc_key_size) 1370 return 0; 1371 1372 /* Nothing else needed, all requirements are met */ 1373 return 1; 1374 } 1375 1376 hci_conn_encrypt(conn); 1377 return 0; 1378 } 1379 EXPORT_SYMBOL(hci_conn_security); 1380 1381 /* Check secure link requirement */ 1382 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level) 1383 { 1384 BT_DBG("hcon %p", conn); 1385 1386 /* Accept if non-secure or higher security level is required */ 1387 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS) 1388 return 1; 1389 1390 /* Accept if secure or higher security level is already present */ 1391 if (conn->sec_level == BT_SECURITY_HIGH || 1392 conn->sec_level == BT_SECURITY_FIPS) 1393 return 1; 1394 1395 /* Reject not secure link */ 1396 return 0; 1397 } 1398 EXPORT_SYMBOL(hci_conn_check_secure); 1399 1400 /* Switch role */ 1401 int hci_conn_switch_role(struct hci_conn *conn, __u8 role) 1402 { 1403 BT_DBG("hcon %p", conn); 1404 1405 if (role == conn->role) 1406 return 1; 1407 1408 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) { 1409 struct hci_cp_switch_role cp; 1410 bacpy(&cp.bdaddr, &conn->dst); 1411 cp.role = role; 1412 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp); 1413 } 1414 1415 return 0; 1416 } 1417 EXPORT_SYMBOL(hci_conn_switch_role); 1418 1419 /* Enter active mode */ 1420 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active) 1421 { 1422 struct hci_dev *hdev = conn->hdev; 1423 1424 BT_DBG("hcon %p mode %d", conn, conn->mode); 1425 1426 if (conn->mode != HCI_CM_SNIFF) 1427 goto timer; 1428 1429 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active) 1430 goto timer; 1431 1432 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) { 1433 struct hci_cp_exit_sniff_mode cp; 1434 cp.handle = cpu_to_le16(conn->handle); 1435 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp); 1436 } 1437 1438 timer: 1439 if (hdev->idle_timeout > 0) 1440 queue_delayed_work(hdev->workqueue, &conn->idle_work, 1441 msecs_to_jiffies(hdev->idle_timeout)); 1442 } 1443 1444 /* Drop all connection on the device */ 1445 void hci_conn_hash_flush(struct hci_dev *hdev) 1446 { 1447 struct hci_conn_hash *h = &hdev->conn_hash; 1448 struct hci_conn *c, *n; 1449 1450 BT_DBG("hdev %s", hdev->name); 1451 1452 list_for_each_entry_safe(c, n, &h->list, list) { 1453 c->state = BT_CLOSED; 1454 1455 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM); 1456 hci_conn_del(c); 1457 } 1458 } 1459 1460 /* Check pending connect attempts */ 1461 void hci_conn_check_pending(struct hci_dev *hdev) 1462 { 1463 struct hci_conn *conn; 1464 1465 BT_DBG("hdev %s", hdev->name); 1466 1467 hci_dev_lock(hdev); 1468 1469 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2); 1470 if (conn) 1471 hci_acl_create_connection(conn); 1472 1473 hci_dev_unlock(hdev); 1474 } 1475 1476 static u32 get_link_mode(struct hci_conn *conn) 1477 { 1478 u32 link_mode = 0; 1479 1480 if (conn->role == HCI_ROLE_MASTER) 1481 link_mode |= HCI_LM_MASTER; 1482 1483 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) 1484 link_mode |= HCI_LM_ENCRYPT; 1485 1486 if (test_bit(HCI_CONN_AUTH, &conn->flags)) 1487 link_mode |= HCI_LM_AUTH; 1488 1489 if (test_bit(HCI_CONN_SECURE, &conn->flags)) 1490 link_mode |= HCI_LM_SECURE; 1491 1492 if (test_bit(HCI_CONN_FIPS, &conn->flags)) 1493 link_mode |= HCI_LM_FIPS; 1494 1495 return link_mode; 1496 } 1497 1498 int hci_get_conn_list(void __user *arg) 1499 { 1500 struct hci_conn *c; 1501 struct hci_conn_list_req req, *cl; 1502 struct hci_conn_info *ci; 1503 struct hci_dev *hdev; 1504 int n = 0, size, err; 1505 1506 if (copy_from_user(&req, arg, sizeof(req))) 1507 return -EFAULT; 1508 1509 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci)) 1510 return -EINVAL; 1511 1512 size = sizeof(req) + req.conn_num * sizeof(*ci); 1513 1514 cl = kmalloc(size, GFP_KERNEL); 1515 if (!cl) 1516 return -ENOMEM; 1517 1518 hdev = hci_dev_get(req.dev_id); 1519 if (!hdev) { 1520 kfree(cl); 1521 return -ENODEV; 1522 } 1523 1524 ci = cl->conn_info; 1525 1526 hci_dev_lock(hdev); 1527 list_for_each_entry(c, &hdev->conn_hash.list, list) { 1528 bacpy(&(ci + n)->bdaddr, &c->dst); 1529 (ci + n)->handle = c->handle; 1530 (ci + n)->type = c->type; 1531 (ci + n)->out = c->out; 1532 (ci + n)->state = c->state; 1533 (ci + n)->link_mode = get_link_mode(c); 1534 if (++n >= req.conn_num) 1535 break; 1536 } 1537 hci_dev_unlock(hdev); 1538 1539 cl->dev_id = hdev->id; 1540 cl->conn_num = n; 1541 size = sizeof(req) + n * sizeof(*ci); 1542 1543 hci_dev_put(hdev); 1544 1545 err = copy_to_user(arg, cl, size); 1546 kfree(cl); 1547 1548 return err ? -EFAULT : 0; 1549 } 1550 1551 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg) 1552 { 1553 struct hci_conn_info_req req; 1554 struct hci_conn_info ci; 1555 struct hci_conn *conn; 1556 char __user *ptr = arg + sizeof(req); 1557 1558 if (copy_from_user(&req, arg, sizeof(req))) 1559 return -EFAULT; 1560 1561 hci_dev_lock(hdev); 1562 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr); 1563 if (conn) { 1564 bacpy(&ci.bdaddr, &conn->dst); 1565 ci.handle = conn->handle; 1566 ci.type = conn->type; 1567 ci.out = conn->out; 1568 ci.state = conn->state; 1569 ci.link_mode = get_link_mode(conn); 1570 } 1571 hci_dev_unlock(hdev); 1572 1573 if (!conn) 1574 return -ENOENT; 1575 1576 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0; 1577 } 1578 1579 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg) 1580 { 1581 struct hci_auth_info_req req; 1582 struct hci_conn *conn; 1583 1584 if (copy_from_user(&req, arg, sizeof(req))) 1585 return -EFAULT; 1586 1587 hci_dev_lock(hdev); 1588 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr); 1589 if (conn) 1590 req.type = conn->auth_type; 1591 hci_dev_unlock(hdev); 1592 1593 if (!conn) 1594 return -ENOENT; 1595 1596 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0; 1597 } 1598 1599 struct hci_chan *hci_chan_create(struct hci_conn *conn) 1600 { 1601 struct hci_dev *hdev = conn->hdev; 1602 struct hci_chan *chan; 1603 1604 BT_DBG("%s hcon %p", hdev->name, conn); 1605 1606 if (test_bit(HCI_CONN_DROP, &conn->flags)) { 1607 BT_DBG("Refusing to create new hci_chan"); 1608 return NULL; 1609 } 1610 1611 chan = kzalloc(sizeof(*chan), GFP_KERNEL); 1612 if (!chan) 1613 return NULL; 1614 1615 chan->conn = hci_conn_get(conn); 1616 skb_queue_head_init(&chan->data_q); 1617 chan->state = BT_CONNECTED; 1618 1619 list_add_rcu(&chan->list, &conn->chan_list); 1620 1621 return chan; 1622 } 1623 1624 void hci_chan_del(struct hci_chan *chan) 1625 { 1626 struct hci_conn *conn = chan->conn; 1627 struct hci_dev *hdev = conn->hdev; 1628 1629 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan); 1630 1631 list_del_rcu(&chan->list); 1632 1633 synchronize_rcu(); 1634 1635 /* Prevent new hci_chan's to be created for this hci_conn */ 1636 set_bit(HCI_CONN_DROP, &conn->flags); 1637 1638 hci_conn_put(conn); 1639 1640 skb_queue_purge(&chan->data_q); 1641 kfree(chan); 1642 } 1643 1644 void hci_chan_list_flush(struct hci_conn *conn) 1645 { 1646 struct hci_chan *chan, *n; 1647 1648 BT_DBG("hcon %p", conn); 1649 1650 list_for_each_entry_safe(chan, n, &conn->chan_list, list) 1651 hci_chan_del(chan); 1652 } 1653 1654 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon, 1655 __u16 handle) 1656 { 1657 struct hci_chan *hchan; 1658 1659 list_for_each_entry(hchan, &hcon->chan_list, list) { 1660 if (hchan->handle == handle) 1661 return hchan; 1662 } 1663 1664 return NULL; 1665 } 1666 1667 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle) 1668 { 1669 struct hci_conn_hash *h = &hdev->conn_hash; 1670 struct hci_conn *hcon; 1671 struct hci_chan *hchan = NULL; 1672 1673 rcu_read_lock(); 1674 1675 list_for_each_entry_rcu(hcon, &h->list, list) { 1676 hchan = __hci_chan_lookup_handle(hcon, handle); 1677 if (hchan) 1678 break; 1679 } 1680 1681 rcu_read_unlock(); 1682 1683 return hchan; 1684 } 1685 1686 u32 hci_conn_get_phy(struct hci_conn *conn) 1687 { 1688 u32 phys = 0; 1689 1690 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471: 1691 * Table 6.2: Packets defined for synchronous, asynchronous, and 1692 * CPB logical transport types. 1693 */ 1694 switch (conn->type) { 1695 case SCO_LINK: 1696 /* SCO logical transport (1 Mb/s): 1697 * HV1, HV2, HV3 and DV. 1698 */ 1699 phys |= BT_PHY_BR_1M_1SLOT; 1700 1701 break; 1702 1703 case ACL_LINK: 1704 /* ACL logical transport (1 Mb/s) ptt=0: 1705 * DH1, DM3, DH3, DM5 and DH5. 1706 */ 1707 phys |= BT_PHY_BR_1M_1SLOT; 1708 1709 if (conn->pkt_type & (HCI_DM3 | HCI_DH3)) 1710 phys |= BT_PHY_BR_1M_3SLOT; 1711 1712 if (conn->pkt_type & (HCI_DM5 | HCI_DH5)) 1713 phys |= BT_PHY_BR_1M_5SLOT; 1714 1715 /* ACL logical transport (2 Mb/s) ptt=1: 1716 * 2-DH1, 2-DH3 and 2-DH5. 1717 */ 1718 if (!(conn->pkt_type & HCI_2DH1)) 1719 phys |= BT_PHY_EDR_2M_1SLOT; 1720 1721 if (!(conn->pkt_type & HCI_2DH3)) 1722 phys |= BT_PHY_EDR_2M_3SLOT; 1723 1724 if (!(conn->pkt_type & HCI_2DH5)) 1725 phys |= BT_PHY_EDR_2M_5SLOT; 1726 1727 /* ACL logical transport (3 Mb/s) ptt=1: 1728 * 3-DH1, 3-DH3 and 3-DH5. 1729 */ 1730 if (!(conn->pkt_type & HCI_3DH1)) 1731 phys |= BT_PHY_EDR_3M_1SLOT; 1732 1733 if (!(conn->pkt_type & HCI_3DH3)) 1734 phys |= BT_PHY_EDR_3M_3SLOT; 1735 1736 if (!(conn->pkt_type & HCI_3DH5)) 1737 phys |= BT_PHY_EDR_3M_5SLOT; 1738 1739 break; 1740 1741 case ESCO_LINK: 1742 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */ 1743 phys |= BT_PHY_BR_1M_1SLOT; 1744 1745 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5))) 1746 phys |= BT_PHY_BR_1M_3SLOT; 1747 1748 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */ 1749 if (!(conn->pkt_type & ESCO_2EV3)) 1750 phys |= BT_PHY_EDR_2M_1SLOT; 1751 1752 if (!(conn->pkt_type & ESCO_2EV5)) 1753 phys |= BT_PHY_EDR_2M_3SLOT; 1754 1755 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */ 1756 if (!(conn->pkt_type & ESCO_3EV3)) 1757 phys |= BT_PHY_EDR_3M_1SLOT; 1758 1759 if (!(conn->pkt_type & ESCO_3EV5)) 1760 phys |= BT_PHY_EDR_3M_3SLOT; 1761 1762 break; 1763 1764 case LE_LINK: 1765 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M) 1766 phys |= BT_PHY_LE_1M_TX; 1767 1768 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M) 1769 phys |= BT_PHY_LE_1M_RX; 1770 1771 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M) 1772 phys |= BT_PHY_LE_2M_TX; 1773 1774 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M) 1775 phys |= BT_PHY_LE_2M_RX; 1776 1777 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED) 1778 phys |= BT_PHY_LE_CODED_TX; 1779 1780 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED) 1781 phys |= BT_PHY_LE_CODED_RX; 1782 1783 break; 1784 } 1785 1786 return phys; 1787 } 1788