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
  38struct sco_param {
  39	u16 pkt_type;
  40	u16 max_latency;
  41	u8  retrans_effort;
  42};
  43
  44static 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
  52static 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
  57static 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 */
  63static 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(&params->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(&params->action, &hdev->pend_le_conns);
 103		break;
 104	case HCI_AUTO_CONN_REPORT:
 105		list_add(&params->action, &hdev->pend_le_reports);
 106		break;
 107	default:
 108		break;
 109	}
 110
 111	hci_update_background_scan(hdev);
 112}
 113
 114static 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 (hdev->notify)
 126		hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
 127
 128	hci_conn_del_sysfs(conn);
 129
 130	debugfs_remove_recursive(conn->debugfs);
 131
 132	hci_dev_put(hdev);
 133
 134	hci_conn_put(conn);
 135}
 136
 137static void le_scan_cleanup(struct work_struct *work)
 138{
 139	struct hci_conn *conn = container_of(work, struct hci_conn,
 140					     le_scan_cleanup);
 141	struct hci_dev *hdev = conn->hdev;
 142	struct hci_conn *c = NULL;
 143
 144	BT_DBG("%s hcon %p", hdev->name, conn);
 145
 146	hci_dev_lock(hdev);
 147
 148	/* Check that the hci_conn is still around */
 149	rcu_read_lock();
 150	list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
 151		if (c == conn)
 152			break;
 153	}
 154	rcu_read_unlock();
 155
 156	if (c == conn) {
 157		hci_connect_le_scan_cleanup(conn);
 158		hci_conn_cleanup(conn);
 159	}
 160
 161	hci_dev_unlock(hdev);
 162	hci_dev_put(hdev);
 163	hci_conn_put(conn);
 164}
 165
 166static void hci_connect_le_scan_remove(struct hci_conn *conn)
 167{
 168	BT_DBG("%s hcon %p", conn->hdev->name, conn);
 169
 170	/* We can't call hci_conn_del/hci_conn_cleanup here since that
 171	 * could deadlock with another hci_conn_del() call that's holding
 172	 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
 173	 * Instead, grab temporary extra references to the hci_dev and
 174	 * hci_conn and perform the necessary cleanup in a separate work
 175	 * callback.
 176	 */
 177
 178	hci_dev_hold(conn->hdev);
 179	hci_conn_get(conn);
 180
 181	/* Even though we hold a reference to the hdev, many other
 182	 * things might get cleaned up meanwhile, including the hdev's
 183	 * own workqueue, so we can't use that for scheduling.
 184	 */
 185	schedule_work(&conn->le_scan_cleanup);
 186}
 187
 188static void hci_acl_create_connection(struct hci_conn *conn)
 189{
 190	struct hci_dev *hdev = conn->hdev;
 191	struct inquiry_entry *ie;
 192	struct hci_cp_create_conn cp;
 193
 194	BT_DBG("hcon %p", conn);
 195
 196	conn->state = BT_CONNECT;
 197	conn->out = true;
 198	conn->role = HCI_ROLE_MASTER;
 199
 200	conn->attempt++;
 201
 202	conn->link_policy = hdev->link_policy;
 203
 204	memset(&cp, 0, sizeof(cp));
 205	bacpy(&cp.bdaddr, &conn->dst);
 206	cp.pscan_rep_mode = 0x02;
 207
 208	ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
 209	if (ie) {
 210		if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
 211			cp.pscan_rep_mode = ie->data.pscan_rep_mode;
 212			cp.pscan_mode     = ie->data.pscan_mode;
 213			cp.clock_offset   = ie->data.clock_offset |
 214					    cpu_to_le16(0x8000);
 215		}
 216
 217		memcpy(conn->dev_class, ie->data.dev_class, 3);
 218		if (ie->data.ssp_mode > 0)
 219			set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
 220	}
 221
 222	cp.pkt_type = cpu_to_le16(conn->pkt_type);
 223	if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
 224		cp.role_switch = 0x01;
 225	else
 226		cp.role_switch = 0x00;
 227
 228	hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
 229}
 230
 231int hci_disconnect(struct hci_conn *conn, __u8 reason)
 232{
 233	BT_DBG("hcon %p", conn);
 234
 235	/* When we are master of an established connection and it enters
 236	 * the disconnect timeout, then go ahead and try to read the
 237	 * current clock offset.  Processing of the result is done
 238	 * within the event handling and hci_clock_offset_evt function.
 239	 */
 240	if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
 241	    (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
 242		struct hci_dev *hdev = conn->hdev;
 243		struct hci_cp_read_clock_offset clkoff_cp;
 244
 245		clkoff_cp.handle = cpu_to_le16(conn->handle);
 246		hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
 247			     &clkoff_cp);
 248	}
 249
 250	return hci_abort_conn(conn, reason);
 251}
 252
 253static void hci_add_sco(struct hci_conn *conn, __u16 handle)
 254{
 255	struct hci_dev *hdev = conn->hdev;
 256	struct hci_cp_add_sco cp;
 257
 258	BT_DBG("hcon %p", conn);
 259
 260	conn->state = BT_CONNECT;
 261	conn->out = true;
 262
 263	conn->attempt++;
 264
 265	cp.handle   = cpu_to_le16(handle);
 266	cp.pkt_type = cpu_to_le16(conn->pkt_type);
 267
 268	hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
 269}
 270
 271bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
 272{
 273	struct hci_dev *hdev = conn->hdev;
 274	struct hci_cp_setup_sync_conn cp;
 275	const struct sco_param *param;
 276
 277	BT_DBG("hcon %p", conn);
 278
 279	conn->state = BT_CONNECT;
 280	conn->out = true;
 281
 282	conn->attempt++;
 283
 284	cp.handle   = cpu_to_le16(handle);
 285
 286	cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
 287	cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
 288	cp.voice_setting  = cpu_to_le16(conn->setting);
 289
 290	switch (conn->setting & SCO_AIRMODE_MASK) {
 291	case SCO_AIRMODE_TRANSP:
 292		if (conn->attempt > ARRAY_SIZE(esco_param_msbc))
 293			return false;
 294		param = &esco_param_msbc[conn->attempt - 1];
 295		break;
 296	case SCO_AIRMODE_CVSD:
 297		if (lmp_esco_capable(conn->link)) {
 298			if (conn->attempt > ARRAY_SIZE(esco_param_cvsd))
 299				return false;
 300			param = &esco_param_cvsd[conn->attempt - 1];
 301		} else {
 302			if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
 303				return false;
 304			param = &sco_param_cvsd[conn->attempt - 1];
 305		}
 306		break;
 307	default:
 308		return false;
 309	}
 310
 311	cp.retrans_effort = param->retrans_effort;
 312	cp.pkt_type = __cpu_to_le16(param->pkt_type);
 313	cp.max_latency = __cpu_to_le16(param->max_latency);
 314
 315	if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
 316		return false;
 317
 318	return true;
 319}
 320
 321u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
 322		      u16 to_multiplier)
 323{
 324	struct hci_dev *hdev = conn->hdev;
 325	struct hci_conn_params *params;
 326	struct hci_cp_le_conn_update cp;
 327
 328	hci_dev_lock(hdev);
 329
 330	params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 331	if (params) {
 332		params->conn_min_interval = min;
 333		params->conn_max_interval = max;
 334		params->conn_latency = latency;
 335		params->supervision_timeout = to_multiplier;
 336	}
 337
 338	hci_dev_unlock(hdev);
 339
 340	memset(&cp, 0, sizeof(cp));
 341	cp.handle		= cpu_to_le16(conn->handle);
 342	cp.conn_interval_min	= cpu_to_le16(min);
 343	cp.conn_interval_max	= cpu_to_le16(max);
 344	cp.conn_latency		= cpu_to_le16(latency);
 345	cp.supervision_timeout	= cpu_to_le16(to_multiplier);
 346	cp.min_ce_len		= cpu_to_le16(0x0000);
 347	cp.max_ce_len		= cpu_to_le16(0x0000);
 348
 349	hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
 350
 351	if (params)
 352		return 0x01;
 353
 354	return 0x00;
 355}
 356
 357void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
 358		      __u8 ltk[16], __u8 key_size)
 359{
 360	struct hci_dev *hdev = conn->hdev;
 361	struct hci_cp_le_start_enc cp;
 362
 363	BT_DBG("hcon %p", conn);
 364
 365	memset(&cp, 0, sizeof(cp));
 366
 367	cp.handle = cpu_to_le16(conn->handle);
 368	cp.rand = rand;
 369	cp.ediv = ediv;
 370	memcpy(cp.ltk, ltk, key_size);
 371
 372	hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
 373}
 374
 375/* Device _must_ be locked */
 376void hci_sco_setup(struct hci_conn *conn, __u8 status)
 377{
 378	struct hci_conn *sco = conn->link;
 379
 380	if (!sco)
 381		return;
 382
 383	BT_DBG("hcon %p", conn);
 384
 385	if (!status) {
 386		if (lmp_esco_capable(conn->hdev))
 387			hci_setup_sync(sco, conn->handle);
 388		else
 389			hci_add_sco(sco, conn->handle);
 390	} else {
 391		hci_connect_cfm(sco, status);
 392		hci_conn_del(sco);
 393	}
 394}
 395
 396static void hci_conn_timeout(struct work_struct *work)
 397{
 398	struct hci_conn *conn = container_of(work, struct hci_conn,
 399					     disc_work.work);
 400	int refcnt = atomic_read(&conn->refcnt);
 401
 402	BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
 403
 404	WARN_ON(refcnt < 0);
 405
 406	/* FIXME: It was observed that in pairing failed scenario, refcnt
 407	 * drops below 0. Probably this is because l2cap_conn_del calls
 408	 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
 409	 * dropped. After that loop hci_chan_del is called which also drops
 410	 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
 411	 * otherwise drop it.
 412	 */
 413	if (refcnt > 0)
 414		return;
 415
 416	/* LE connections in scanning state need special handling */
 417	if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
 418	    test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 419		hci_connect_le_scan_remove(conn);
 420		return;
 421	}
 422
 423	hci_abort_conn(conn, hci_proto_disconn_ind(conn));
 424}
 425
 426/* Enter sniff mode */
 427static void hci_conn_idle(struct work_struct *work)
 428{
 429	struct hci_conn *conn = container_of(work, struct hci_conn,
 430					     idle_work.work);
 431	struct hci_dev *hdev = conn->hdev;
 432
 433	BT_DBG("hcon %p mode %d", conn, conn->mode);
 434
 435	if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
 436		return;
 437
 438	if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
 439		return;
 440
 441	if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
 442		struct hci_cp_sniff_subrate cp;
 443		cp.handle             = cpu_to_le16(conn->handle);
 444		cp.max_latency        = cpu_to_le16(0);
 445		cp.min_remote_timeout = cpu_to_le16(0);
 446		cp.min_local_timeout  = cpu_to_le16(0);
 447		hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
 448	}
 449
 450	if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
 451		struct hci_cp_sniff_mode cp;
 452		cp.handle       = cpu_to_le16(conn->handle);
 453		cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
 454		cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
 455		cp.attempt      = cpu_to_le16(4);
 456		cp.timeout      = cpu_to_le16(1);
 457		hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
 458	}
 459}
 460
 461static void hci_conn_auto_accept(struct work_struct *work)
 462{
 463	struct hci_conn *conn = container_of(work, struct hci_conn,
 464					     auto_accept_work.work);
 465
 466	hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
 467		     &conn->dst);
 468}
 469
 470static void le_conn_timeout(struct work_struct *work)
 471{
 472	struct hci_conn *conn = container_of(work, struct hci_conn,
 473					     le_conn_timeout.work);
 474	struct hci_dev *hdev = conn->hdev;
 475
 476	BT_DBG("");
 477
 478	/* We could end up here due to having done directed advertising,
 479	 * so clean up the state if necessary. This should however only
 480	 * happen with broken hardware or if low duty cycle was used
 481	 * (which doesn't have a timeout of its own).
 482	 */
 483	if (conn->role == HCI_ROLE_SLAVE) {
 484		u8 enable = 0x00;
 485		hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 486			     &enable);
 487		hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
 488		return;
 489	}
 490
 491	hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
 492}
 493
 494struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
 495			      u8 role)
 496{
 497	struct hci_conn *conn;
 498
 499	BT_DBG("%s dst %pMR", hdev->name, dst);
 500
 501	conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 502	if (!conn)
 503		return NULL;
 504
 505	bacpy(&conn->dst, dst);
 506	bacpy(&conn->src, &hdev->bdaddr);
 507	conn->hdev  = hdev;
 508	conn->type  = type;
 509	conn->role  = role;
 510	conn->mode  = HCI_CM_ACTIVE;
 511	conn->state = BT_OPEN;
 512	conn->auth_type = HCI_AT_GENERAL_BONDING;
 513	conn->io_capability = hdev->io_capability;
 514	conn->remote_auth = 0xff;
 515	conn->key_type = 0xff;
 516	conn->rssi = HCI_RSSI_INVALID;
 517	conn->tx_power = HCI_TX_POWER_INVALID;
 518	conn->max_tx_power = HCI_TX_POWER_INVALID;
 519
 520	set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
 521	conn->disc_timeout = HCI_DISCONN_TIMEOUT;
 522
 523	if (conn->role == HCI_ROLE_MASTER)
 524		conn->out = true;
 525
 526	switch (type) {
 527	case ACL_LINK:
 528		conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
 529		break;
 530	case LE_LINK:
 531		/* conn->src should reflect the local identity address */
 532		hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
 533		break;
 534	case SCO_LINK:
 535		if (lmp_esco_capable(hdev))
 536			conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
 537					(hdev->esco_type & EDR_ESCO_MASK);
 538		else
 539			conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
 540		break;
 541	case ESCO_LINK:
 542		conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
 543		break;
 544	}
 545
 546	skb_queue_head_init(&conn->data_q);
 547
 548	INIT_LIST_HEAD(&conn->chan_list);
 549
 550	INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
 551	INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
 552	INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
 553	INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
 554	INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
 555
 556	atomic_set(&conn->refcnt, 0);
 557
 558	hci_dev_hold(hdev);
 559
 560	hci_conn_hash_add(hdev, conn);
 561	if (hdev->notify)
 562		hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
 563
 564	hci_conn_init_sysfs(conn);
 565
 566	return conn;
 567}
 568
 569int hci_conn_del(struct hci_conn *conn)
 570{
 571	struct hci_dev *hdev = conn->hdev;
 572
 573	BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
 574
 575	cancel_delayed_work_sync(&conn->disc_work);
 576	cancel_delayed_work_sync(&conn->auto_accept_work);
 577	cancel_delayed_work_sync(&conn->idle_work);
 578
 579	if (conn->type == ACL_LINK) {
 580		struct hci_conn *sco = conn->link;
 581		if (sco)
 582			sco->link = NULL;
 583
 584		/* Unacked frames */
 585		hdev->acl_cnt += conn->sent;
 586	} else if (conn->type == LE_LINK) {
 587		cancel_delayed_work(&conn->le_conn_timeout);
 588
 589		if (hdev->le_pkts)
 590			hdev->le_cnt += conn->sent;
 591		else
 592			hdev->acl_cnt += conn->sent;
 593	} else {
 594		struct hci_conn *acl = conn->link;
 595		if (acl) {
 596			acl->link = NULL;
 597			hci_conn_drop(acl);
 598		}
 599	}
 600
 601	if (conn->amp_mgr)
 602		amp_mgr_put(conn->amp_mgr);
 603
 604	skb_queue_purge(&conn->data_q);
 605
 606	/* Remove the connection from the list and cleanup its remaining
 607	 * state. This is a separate function since for some cases like
 608	 * BT_CONNECT_SCAN we *only* want the cleanup part without the
 609	 * rest of hci_conn_del.
 610	 */
 611	hci_conn_cleanup(conn);
 612
 613	return 0;
 614}
 615
 616struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
 617{
 618	int use_src = bacmp(src, BDADDR_ANY);
 619	struct hci_dev *hdev = NULL, *d;
 620
 621	BT_DBG("%pMR -> %pMR", src, dst);
 622
 623	read_lock(&hci_dev_list_lock);
 624
 625	list_for_each_entry(d, &hci_dev_list, list) {
 626		if (!test_bit(HCI_UP, &d->flags) ||
 627		    hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
 628		    d->dev_type != HCI_BREDR)
 629			continue;
 630
 631		/* Simple routing:
 632		 *   No source address - find interface with bdaddr != dst
 633		 *   Source address    - find interface with bdaddr == src
 634		 */
 635
 636		if (use_src) {
 637			if (!bacmp(&d->bdaddr, src)) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 638				hdev = d; break;
 639			}
 640		} else {
 641			if (bacmp(&d->bdaddr, dst)) {
 642				hdev = d; break;
 643			}
 644		}
 645	}
 646
 647	if (hdev)
 648		hdev = hci_dev_hold(hdev);
 649
 650	read_unlock(&hci_dev_list_lock);
 651	return hdev;
 652}
 653EXPORT_SYMBOL(hci_get_route);
 654
 655/* This function requires the caller holds hdev->lock */
 656void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 657{
 658	struct hci_dev *hdev = conn->hdev;
 659	struct hci_conn_params *params;
 660
 661	params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
 662					   conn->dst_type);
 663	if (params && params->conn) {
 664		hci_conn_drop(params->conn);
 665		hci_conn_put(params->conn);
 666		params->conn = NULL;
 667	}
 668
 669	conn->state = BT_CLOSED;
 670
 671	/* If the status indicates successful cancellation of
 672	 * the attempt (i.e. Unkown Connection Id) there's no point of
 673	 * notifying failure since we'll go back to keep trying to
 674	 * connect. The only exception is explicit connect requests
 675	 * where a timeout + cancel does indicate an actual failure.
 676	 */
 677	if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
 678	    (params && params->explicit_connect))
 679		mgmt_connect_failed(hdev, &conn->dst, conn->type,
 680				    conn->dst_type, status);
 681
 682	hci_connect_cfm(conn, status);
 683
 684	hci_conn_del(conn);
 685
 686	/* Since we may have temporarily stopped the background scanning in
 687	 * favor of connection establishment, we should restart it.
 688	 */
 689	hci_update_background_scan(hdev);
 690
 691	/* Re-enable advertising in case this was a failed connection
 692	 * attempt as a peripheral.
 693	 */
 694	hci_req_reenable_advertising(hdev);
 695}
 696
 697static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 698{
 699	struct hci_conn *conn;
 700
 701	hci_dev_lock(hdev);
 702
 703	conn = hci_lookup_le_connect(hdev);
 704
 705	if (!status) {
 706		hci_connect_le_scan_cleanup(conn);
 707		goto done;
 708	}
 709
 710	BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
 711	       status);
 712
 713	if (!conn)
 714		goto done;
 715
 716	hci_le_conn_failed(conn, status);
 717
 718done:
 719	hci_dev_unlock(hdev);
 720}
 721
 722static bool conn_use_rpa(struct hci_conn *conn)
 723{
 724	struct hci_dev *hdev = conn->hdev;
 725
 726	return hci_dev_test_flag(hdev, HCI_PRIVACY);
 727}
 728
 729static void hci_req_add_le_create_conn(struct hci_request *req,
 730				       struct hci_conn *conn)
 
 731{
 732	struct hci_cp_le_create_conn cp;
 733	struct hci_dev *hdev = conn->hdev;
 734	u8 own_addr_type;
 735
 736	/* Update random address, but set require_privacy to false so
 737	 * that we never connect with an non-resolvable address.
 738	 */
 739	if (hci_update_random_address(req, false, conn_use_rpa(conn),
 740				      &own_addr_type))
 741		return;
 
 
 
 
 
 
 
 
 
 
 
 
 742
 743	memset(&cp, 0, sizeof(cp));
 744
 745	/* Set window to be the same value as the interval to enable
 746	 * continuous scanning.
 747	 */
 748	cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
 749	cp.scan_window = cp.scan_interval;
 750
 751	bacpy(&cp.peer_addr, &conn->dst);
 752	cp.peer_addr_type = conn->dst_type;
 753	cp.own_address_type = own_addr_type;
 754	cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
 755	cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
 756	cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
 757	cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
 758	cp.min_ce_len = cpu_to_le16(0x0000);
 759	cp.max_ce_len = cpu_to_le16(0x0000);
 760
 761	hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
 762
 763	conn->state = BT_CONNECT;
 764	clear_bit(HCI_CONN_SCANNING, &conn->flags);
 765}
 766
 767static void hci_req_directed_advertising(struct hci_request *req,
 768					 struct hci_conn *conn)
 769{
 770	struct hci_dev *hdev = req->hdev;
 771	struct hci_cp_le_set_adv_param cp;
 772	u8 own_addr_type;
 773	u8 enable;
 774
 775	/* Clear the HCI_LE_ADV bit temporarily so that the
 776	 * hci_update_random_address knows that it's safe to go ahead
 777	 * and write a new random address. The flag will be set back on
 778	 * as soon as the SET_ADV_ENABLE HCI command completes.
 779	 */
 780	hci_dev_clear_flag(hdev, HCI_LE_ADV);
 781
 782	/* Set require_privacy to false so that the remote device has a
 783	 * chance of identifying us.
 784	 */
 785	if (hci_update_random_address(req, false, conn_use_rpa(conn),
 786				      &own_addr_type) < 0)
 787		return;
 788
 789	memset(&cp, 0, sizeof(cp));
 790	cp.type = LE_ADV_DIRECT_IND;
 791	cp.own_address_type = own_addr_type;
 792	cp.direct_addr_type = conn->dst_type;
 793	bacpy(&cp.direct_addr, &conn->dst);
 794	cp.channel_map = hdev->le_adv_channel_map;
 795
 796	hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
 797
 798	enable = 0x01;
 799	hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
 800
 801	conn->state = BT_CONNECT;
 802}
 803
 804struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
 805				u8 dst_type, u8 sec_level, u16 conn_timeout,
 806				u8 role)
 807{
 808	struct hci_conn_params *params;
 809	struct hci_conn *conn;
 810	struct smp_irk *irk;
 811	struct hci_request req;
 812	int err;
 813
 814	/* Let's make sure that le is enabled.*/
 815	if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
 816		if (lmp_le_capable(hdev))
 817			return ERR_PTR(-ECONNREFUSED);
 818
 819		return ERR_PTR(-EOPNOTSUPP);
 820	}
 821
 822	/* Since the controller supports only one LE connection attempt at a
 823	 * time, we return -EBUSY if there is any connection attempt running.
 824	 */
 825	if (hci_lookup_le_connect(hdev))
 826		return ERR_PTR(-EBUSY);
 827
 828	/* If there's already a connection object but it's not in
 829	 * scanning state it means it must already be established, in
 830	 * which case we can't do anything else except report a failure
 831	 * to connect.
 832	 */
 833	conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
 834	if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
 835		return ERR_PTR(-EBUSY);
 836	}
 837
 838	/* When given an identity address with existing identity
 839	 * resolving key, the connection needs to be established
 840	 * to a resolvable random address.
 841	 *
 842	 * Storing the resolvable random address is required here
 843	 * to handle connection failures. The address will later
 844	 * be resolved back into the original identity address
 845	 * from the connect request.
 846	 */
 847	irk = hci_find_irk_by_addr(hdev, dst, dst_type);
 848	if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
 849		dst = &irk->rpa;
 850		dst_type = ADDR_LE_DEV_RANDOM;
 851	}
 852
 853	if (conn) {
 854		bacpy(&conn->dst, dst);
 855	} else {
 856		conn = hci_conn_add(hdev, LE_LINK, dst, role);
 857		if (!conn)
 858			return ERR_PTR(-ENOMEM);
 859		hci_conn_hold(conn);
 860		conn->pending_sec_level = sec_level;
 861	}
 862
 863	conn->dst_type = dst_type;
 864	conn->sec_level = BT_SECURITY_LOW;
 865	conn->conn_timeout = conn_timeout;
 866
 867	hci_req_init(&req, hdev);
 868
 869	/* Disable advertising if we're active. For master role
 870	 * connections most controllers will refuse to connect if
 871	 * advertising is enabled, and for slave role connections we
 872	 * anyway have to disable it in order to start directed
 873	 * advertising.
 874	 */
 875	if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
 876		u8 enable = 0x00;
 877		hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
 878			    &enable);
 879	}
 880
 881	/* If requested to connect as slave use directed advertising */
 882	if (conn->role == HCI_ROLE_SLAVE) {
 883		/* If we're active scanning most controllers are unable
 884		 * to initiate advertising. Simply reject the attempt.
 885		 */
 886		if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
 887		    hdev->le_scan_type == LE_SCAN_ACTIVE) {
 888			skb_queue_purge(&req.cmd_q);
 889			hci_conn_del(conn);
 890			return ERR_PTR(-EBUSY);
 891		}
 892
 893		hci_req_directed_advertising(&req, conn);
 894		goto create_conn;
 895	}
 896
 897	params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 898	if (params) {
 899		conn->le_conn_min_interval = params->conn_min_interval;
 900		conn->le_conn_max_interval = params->conn_max_interval;
 901		conn->le_conn_latency = params->conn_latency;
 902		conn->le_supv_timeout = params->supervision_timeout;
 903	} else {
 904		conn->le_conn_min_interval = hdev->le_conn_min_interval;
 905		conn->le_conn_max_interval = hdev->le_conn_max_interval;
 906		conn->le_conn_latency = hdev->le_conn_latency;
 907		conn->le_supv_timeout = hdev->le_supv_timeout;
 908	}
 909
 910	/* If controller is scanning, we stop it since some controllers are
 911	 * not able to scan and connect at the same time. Also set the
 912	 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
 913	 * handler for scan disabling knows to set the correct discovery
 914	 * state.
 915	 */
 916	if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
 917		hci_req_add_le_scan_disable(&req);
 918		hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
 919	}
 920
 921	hci_req_add_le_create_conn(&req, conn);
 922
 923create_conn:
 924	err = hci_req_run(&req, create_le_conn_complete);
 925	if (err) {
 926		hci_conn_del(conn);
 927		return ERR_PTR(err);
 928	}
 929
 930	return conn;
 931}
 932
 933static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
 934{
 935	struct hci_conn *conn;
 936
 937	conn = hci_conn_hash_lookup_le(hdev, addr, type);
 938	if (!conn)
 939		return false;
 940
 941	if (conn->state != BT_CONNECTED)
 942		return false;
 943
 944	return true;
 945}
 946
 947/* This function requires the caller holds hdev->lock */
 948static int hci_explicit_conn_params_set(struct hci_dev *hdev,
 949					bdaddr_t *addr, u8 addr_type)
 950{
 951	struct hci_conn_params *params;
 952
 953	if (is_connected(hdev, addr, addr_type))
 954		return -EISCONN;
 955
 956	params = hci_conn_params_lookup(hdev, addr, addr_type);
 957	if (!params) {
 958		params = hci_conn_params_add(hdev, addr, addr_type);
 959		if (!params)
 960			return -ENOMEM;
 961
 962		/* If we created new params, mark them to be deleted in
 963		 * hci_connect_le_scan_cleanup. It's different case than
 964		 * existing disabled params, those will stay after cleanup.
 965		 */
 966		params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
 967	}
 968
 969	/* We're trying to connect, so make sure params are at pend_le_conns */
 970	if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
 971	    params->auto_connect == HCI_AUTO_CONN_REPORT ||
 972	    params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
 973		list_del_init(&params->action);
 974		list_add(&params->action, &hdev->pend_le_conns);
 975	}
 976
 977	params->explicit_connect = true;
 978
 979	BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
 980	       params->auto_connect);
 981
 982	return 0;
 983}
 984
 985/* This function requires the caller holds hdev->lock */
 986struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
 987				     u8 dst_type, u8 sec_level,
 988				     u16 conn_timeout)
 989{
 990	struct hci_conn *conn;
 991
 992	/* Let's make sure that le is enabled.*/
 993	if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
 994		if (lmp_le_capable(hdev))
 995			return ERR_PTR(-ECONNREFUSED);
 996
 997		return ERR_PTR(-EOPNOTSUPP);
 998	}
 999
1000	/* Some devices send ATT messages as soon as the physical link is
1001	 * established. To be able to handle these ATT messages, the user-
1002	 * space first establishes the connection and then starts the pairing
1003	 * process.
1004	 *
1005	 * So if a hci_conn object already exists for the following connection
1006	 * attempt, we simply update pending_sec_level and auth_type fields
1007	 * and return the object found.
1008	 */
1009	conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1010	if (conn) {
1011		if (conn->pending_sec_level < sec_level)
1012			conn->pending_sec_level = sec_level;
1013		goto done;
1014	}
1015
1016	BT_DBG("requesting refresh of dst_addr");
1017
1018	conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1019	if (!conn)
1020		return ERR_PTR(-ENOMEM);
1021
1022	if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0)
1023		return ERR_PTR(-EBUSY);
1024
1025	conn->state = BT_CONNECT;
1026	set_bit(HCI_CONN_SCANNING, &conn->flags);
1027	conn->dst_type = dst_type;
1028	conn->sec_level = BT_SECURITY_LOW;
1029	conn->pending_sec_level = sec_level;
1030	conn->conn_timeout = conn_timeout;
1031
1032	hci_update_background_scan(hdev);
1033
1034done:
1035	hci_conn_hold(conn);
1036	return conn;
1037}
1038
1039struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1040				 u8 sec_level, u8 auth_type)
1041{
1042	struct hci_conn *acl;
1043
1044	if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1045		if (lmp_bredr_capable(hdev))
1046			return ERR_PTR(-ECONNREFUSED);
1047
1048		return ERR_PTR(-EOPNOTSUPP);
1049	}
1050
1051	acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1052	if (!acl) {
1053		acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1054		if (!acl)
1055			return ERR_PTR(-ENOMEM);
1056	}
1057
1058	hci_conn_hold(acl);
1059
1060	if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1061		acl->sec_level = BT_SECURITY_LOW;
1062		acl->pending_sec_level = sec_level;
1063		acl->auth_type = auth_type;
1064		hci_acl_create_connection(acl);
1065	}
1066
1067	return acl;
1068}
1069
1070struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1071				 __u16 setting)
1072{
1073	struct hci_conn *acl;
1074	struct hci_conn *sco;
1075
1076	acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1077	if (IS_ERR(acl))
1078		return acl;
1079
1080	sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1081	if (!sco) {
1082		sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1083		if (!sco) {
1084			hci_conn_drop(acl);
1085			return ERR_PTR(-ENOMEM);
1086		}
1087	}
1088
1089	acl->link = sco;
1090	sco->link = acl;
1091
1092	hci_conn_hold(sco);
1093
1094	sco->setting = setting;
1095
1096	if (acl->state == BT_CONNECTED &&
1097	    (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1098		set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1099		hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1100
1101		if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1102			/* defer SCO setup until mode change completed */
1103			set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1104			return sco;
1105		}
1106
1107		hci_sco_setup(acl, 0x00);
1108	}
1109
1110	return sco;
1111}
1112
1113/* Check link security requirement */
1114int hci_conn_check_link_mode(struct hci_conn *conn)
1115{
1116	BT_DBG("hcon %p", conn);
1117
1118	/* In Secure Connections Only mode, it is required that Secure
1119	 * Connections is used and the link is encrypted with AES-CCM
1120	 * using a P-256 authenticated combination key.
1121	 */
1122	if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1123		if (!hci_conn_sc_enabled(conn) ||
1124		    !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1125		    conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1126			return 0;
1127	}
1128
1129	if (hci_conn_ssp_enabled(conn) &&
1130	    !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1131		return 0;
1132
1133	return 1;
1134}
1135
1136/* Authenticate remote device */
1137static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1138{
1139	BT_DBG("hcon %p", conn);
1140
1141	if (conn->pending_sec_level > sec_level)
1142		sec_level = conn->pending_sec_level;
1143
1144	if (sec_level > conn->sec_level)
1145		conn->pending_sec_level = sec_level;
1146	else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1147		return 1;
1148
1149	/* Make sure we preserve an existing MITM requirement*/
1150	auth_type |= (conn->auth_type & 0x01);
1151
1152	conn->auth_type = auth_type;
1153
1154	if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1155		struct hci_cp_auth_requested cp;
1156
1157		cp.handle = cpu_to_le16(conn->handle);
1158		hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1159			     sizeof(cp), &cp);
1160
1161		/* If we're already encrypted set the REAUTH_PEND flag,
1162		 * otherwise set the ENCRYPT_PEND.
1163		 */
1164		if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1165			set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1166		else
1167			set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1168	}
1169
1170	return 0;
1171}
1172
1173/* Encrypt the the link */
1174static void hci_conn_encrypt(struct hci_conn *conn)
1175{
1176	BT_DBG("hcon %p", conn);
1177
1178	if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1179		struct hci_cp_set_conn_encrypt cp;
1180		cp.handle  = cpu_to_le16(conn->handle);
1181		cp.encrypt = 0x01;
1182		hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1183			     &cp);
1184	}
1185}
1186
1187/* Enable security */
1188int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1189		      bool initiator)
1190{
1191	BT_DBG("hcon %p", conn);
1192
1193	if (conn->type == LE_LINK)
1194		return smp_conn_security(conn, sec_level);
1195
1196	/* For sdp we don't need the link key. */
1197	if (sec_level == BT_SECURITY_SDP)
1198		return 1;
1199
1200	/* For non 2.1 devices and low security level we don't need the link
1201	   key. */
1202	if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1203		return 1;
1204
1205	/* For other security levels we need the link key. */
1206	if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1207		goto auth;
1208
1209	/* An authenticated FIPS approved combination key has sufficient
1210	 * security for security level 4. */
1211	if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1212	    sec_level == BT_SECURITY_FIPS)
1213		goto encrypt;
1214
1215	/* An authenticated combination key has sufficient security for
1216	   security level 3. */
1217	if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1218	     conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1219	    sec_level == BT_SECURITY_HIGH)
1220		goto encrypt;
1221
1222	/* An unauthenticated combination key has sufficient security for
1223	   security level 1 and 2. */
1224	if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1225	     conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1226	    (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1227		goto encrypt;
1228
1229	/* A combination key has always sufficient security for the security
1230	   levels 1 or 2. High security level requires the combination key
1231	   is generated using maximum PIN code length (16).
1232	   For pre 2.1 units. */
1233	if (conn->key_type == HCI_LK_COMBINATION &&
1234	    (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1235	     conn->pin_length == 16))
1236		goto encrypt;
1237
1238auth:
1239	if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1240		return 0;
1241
1242	if (initiator)
1243		set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1244
1245	if (!hci_conn_auth(conn, sec_level, auth_type))
1246		return 0;
1247
1248encrypt:
1249	if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1250		return 1;
1251
1252	hci_conn_encrypt(conn);
1253	return 0;
1254}
1255EXPORT_SYMBOL(hci_conn_security);
1256
1257/* Check secure link requirement */
1258int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1259{
1260	BT_DBG("hcon %p", conn);
1261
1262	/* Accept if non-secure or higher security level is required */
1263	if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1264		return 1;
1265
1266	/* Accept if secure or higher security level is already present */
1267	if (conn->sec_level == BT_SECURITY_HIGH ||
1268	    conn->sec_level == BT_SECURITY_FIPS)
1269		return 1;
1270
1271	/* Reject not secure link */
1272	return 0;
1273}
1274EXPORT_SYMBOL(hci_conn_check_secure);
1275
1276/* Switch role */
1277int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1278{
1279	BT_DBG("hcon %p", conn);
1280
1281	if (role == conn->role)
1282		return 1;
1283
1284	if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1285		struct hci_cp_switch_role cp;
1286		bacpy(&cp.bdaddr, &conn->dst);
1287		cp.role = role;
1288		hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1289	}
1290
1291	return 0;
1292}
1293EXPORT_SYMBOL(hci_conn_switch_role);
1294
1295/* Enter active mode */
1296void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1297{
1298	struct hci_dev *hdev = conn->hdev;
1299
1300	BT_DBG("hcon %p mode %d", conn, conn->mode);
1301
1302	if (conn->mode != HCI_CM_SNIFF)
1303		goto timer;
1304
1305	if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1306		goto timer;
1307
1308	if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1309		struct hci_cp_exit_sniff_mode cp;
1310		cp.handle = cpu_to_le16(conn->handle);
1311		hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1312	}
1313
1314timer:
1315	if (hdev->idle_timeout > 0)
1316		queue_delayed_work(hdev->workqueue, &conn->idle_work,
1317				   msecs_to_jiffies(hdev->idle_timeout));
1318}
1319
1320/* Drop all connection on the device */
1321void hci_conn_hash_flush(struct hci_dev *hdev)
1322{
1323	struct hci_conn_hash *h = &hdev->conn_hash;
1324	struct hci_conn *c, *n;
1325
1326	BT_DBG("hdev %s", hdev->name);
1327
1328	list_for_each_entry_safe(c, n, &h->list, list) {
1329		c->state = BT_CLOSED;
1330
1331		hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1332		hci_conn_del(c);
1333	}
1334}
1335
1336/* Check pending connect attempts */
1337void hci_conn_check_pending(struct hci_dev *hdev)
1338{
1339	struct hci_conn *conn;
1340
1341	BT_DBG("hdev %s", hdev->name);
1342
1343	hci_dev_lock(hdev);
1344
1345	conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1346	if (conn)
1347		hci_acl_create_connection(conn);
1348
1349	hci_dev_unlock(hdev);
1350}
1351
1352static u32 get_link_mode(struct hci_conn *conn)
1353{
1354	u32 link_mode = 0;
1355
1356	if (conn->role == HCI_ROLE_MASTER)
1357		link_mode |= HCI_LM_MASTER;
1358
1359	if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1360		link_mode |= HCI_LM_ENCRYPT;
1361
1362	if (test_bit(HCI_CONN_AUTH, &conn->flags))
1363		link_mode |= HCI_LM_AUTH;
1364
1365	if (test_bit(HCI_CONN_SECURE, &conn->flags))
1366		link_mode |= HCI_LM_SECURE;
1367
1368	if (test_bit(HCI_CONN_FIPS, &conn->flags))
1369		link_mode |= HCI_LM_FIPS;
1370
1371	return link_mode;
1372}
1373
1374int hci_get_conn_list(void __user *arg)
1375{
1376	struct hci_conn *c;
1377	struct hci_conn_list_req req, *cl;
1378	struct hci_conn_info *ci;
1379	struct hci_dev *hdev;
1380	int n = 0, size, err;
1381
1382	if (copy_from_user(&req, arg, sizeof(req)))
1383		return -EFAULT;
1384
1385	if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1386		return -EINVAL;
1387
1388	size = sizeof(req) + req.conn_num * sizeof(*ci);
1389
1390	cl = kmalloc(size, GFP_KERNEL);
1391	if (!cl)
1392		return -ENOMEM;
1393
1394	hdev = hci_dev_get(req.dev_id);
1395	if (!hdev) {
1396		kfree(cl);
1397		return -ENODEV;
1398	}
1399
1400	ci = cl->conn_info;
1401
1402	hci_dev_lock(hdev);
1403	list_for_each_entry(c, &hdev->conn_hash.list, list) {
1404		bacpy(&(ci + n)->bdaddr, &c->dst);
1405		(ci + n)->handle = c->handle;
1406		(ci + n)->type  = c->type;
1407		(ci + n)->out   = c->out;
1408		(ci + n)->state = c->state;
1409		(ci + n)->link_mode = get_link_mode(c);
1410		if (++n >= req.conn_num)
1411			break;
1412	}
1413	hci_dev_unlock(hdev);
1414
1415	cl->dev_id = hdev->id;
1416	cl->conn_num = n;
1417	size = sizeof(req) + n * sizeof(*ci);
1418
1419	hci_dev_put(hdev);
1420
1421	err = copy_to_user(arg, cl, size);
1422	kfree(cl);
1423
1424	return err ? -EFAULT : 0;
1425}
1426
1427int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1428{
1429	struct hci_conn_info_req req;
1430	struct hci_conn_info ci;
1431	struct hci_conn *conn;
1432	char __user *ptr = arg + sizeof(req);
1433
1434	if (copy_from_user(&req, arg, sizeof(req)))
1435		return -EFAULT;
1436
1437	hci_dev_lock(hdev);
1438	conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1439	if (conn) {
1440		bacpy(&ci.bdaddr, &conn->dst);
1441		ci.handle = conn->handle;
1442		ci.type  = conn->type;
1443		ci.out   = conn->out;
1444		ci.state = conn->state;
1445		ci.link_mode = get_link_mode(conn);
1446	}
1447	hci_dev_unlock(hdev);
1448
1449	if (!conn)
1450		return -ENOENT;
1451
1452	return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1453}
1454
1455int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1456{
1457	struct hci_auth_info_req req;
1458	struct hci_conn *conn;
1459
1460	if (copy_from_user(&req, arg, sizeof(req)))
1461		return -EFAULT;
1462
1463	hci_dev_lock(hdev);
1464	conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1465	if (conn)
1466		req.type = conn->auth_type;
1467	hci_dev_unlock(hdev);
1468
1469	if (!conn)
1470		return -ENOENT;
1471
1472	return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1473}
1474
1475struct hci_chan *hci_chan_create(struct hci_conn *conn)
1476{
1477	struct hci_dev *hdev = conn->hdev;
1478	struct hci_chan *chan;
1479
1480	BT_DBG("%s hcon %p", hdev->name, conn);
1481
1482	if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1483		BT_DBG("Refusing to create new hci_chan");
1484		return NULL;
1485	}
1486
1487	chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1488	if (!chan)
1489		return NULL;
1490
1491	chan->conn = hci_conn_get(conn);
1492	skb_queue_head_init(&chan->data_q);
1493	chan->state = BT_CONNECTED;
1494
1495	list_add_rcu(&chan->list, &conn->chan_list);
1496
1497	return chan;
1498}
1499
1500void hci_chan_del(struct hci_chan *chan)
1501{
1502	struct hci_conn *conn = chan->conn;
1503	struct hci_dev *hdev = conn->hdev;
1504
1505	BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1506
1507	list_del_rcu(&chan->list);
1508
1509	synchronize_rcu();
1510
1511	/* Prevent new hci_chan's to be created for this hci_conn */
1512	set_bit(HCI_CONN_DROP, &conn->flags);
1513
1514	hci_conn_put(conn);
1515
1516	skb_queue_purge(&chan->data_q);
1517	kfree(chan);
1518}
1519
1520void hci_chan_list_flush(struct hci_conn *conn)
1521{
1522	struct hci_chan *chan, *n;
1523
1524	BT_DBG("hcon %p", conn);
1525
1526	list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1527		hci_chan_del(chan);
1528}
1529
1530static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1531						 __u16 handle)
1532{
1533	struct hci_chan *hchan;
1534
1535	list_for_each_entry(hchan, &hcon->chan_list, list) {
1536		if (hchan->handle == handle)
1537			return hchan;
1538	}
1539
1540	return NULL;
1541}
1542
1543struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1544{
1545	struct hci_conn_hash *h = &hdev->conn_hash;
1546	struct hci_conn *hcon;
1547	struct hci_chan *hchan = NULL;
1548
1549	rcu_read_lock();
1550
1551	list_for_each_entry_rcu(hcon, &h->list, list) {
1552		hchan = __hci_chan_lookup_handle(hcon, handle);
1553		if (hchan)
1554			break;
1555	}
1556
1557	rcu_read_unlock();
1558
1559	return hchan;
1560}