hci_conn.c 41.3 KB
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/*
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   BlueZ - Bluetooth protocol stack for Linux
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   Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
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   Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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   SOFTWARE IS DISCLAIMED.
*/

/* Bluetooth HCI connection handling. */

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#include <linux/export.h>
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#include <linux/debugfs.h>
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#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/l2cap.h>
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#include "hci_request.h"
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#include "smp.h"
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#include "a2mp.h"

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struct sco_param {
	u16 pkt_type;
	u16 max_latency;
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	u8  retrans_effort;
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};

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static const struct sco_param esco_param_cvsd[] = {
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	{ EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a,	0x01 }, /* S3 */
	{ EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007,	0x01 }, /* S2 */
	{ EDR_ESCO_MASK | ESCO_EV3,   0x0007,	0x01 }, /* S1 */
	{ EDR_ESCO_MASK | ESCO_HV3,   0xffff,	0x01 }, /* D1 */
	{ EDR_ESCO_MASK | ESCO_HV1,   0xffff,	0x01 }, /* D0 */
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};

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static const struct sco_param sco_param_cvsd[] = {
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	{ EDR_ESCO_MASK | ESCO_HV3,   0xffff,	0xff }, /* D1 */
	{ EDR_ESCO_MASK | ESCO_HV1,   0xffff,	0xff }, /* D0 */
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};

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static const struct sco_param esco_param_msbc[] = {
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	{ EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d,	0x02 }, /* T2 */
	{ EDR_ESCO_MASK | ESCO_EV3,   0x0008,	0x02 }, /* T1 */
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};

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static void hci_le_create_connection_cancel(struct hci_conn *conn)
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{
	hci_send_cmd(conn->hdev, HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL);
}

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/* This function requires the caller holds hdev->lock */
static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
{
	struct hci_conn_params *params;
	struct smp_irk *irk;
	bdaddr_t *bdaddr;
	u8 bdaddr_type;

	bdaddr = &conn->dst;
	bdaddr_type = conn->dst_type;

	/* Check if we need to convert to identity address */
	irk = hci_get_irk(conn->hdev, bdaddr, bdaddr_type);
	if (irk) {
		bdaddr = &irk->bdaddr;
		bdaddr_type = irk->addr_type;
	}

	params = hci_explicit_connect_lookup(conn->hdev, bdaddr, bdaddr_type);
	if (!params)
		return;

	/* The connection attempt was doing scan for new RPA, and is
	 * in scan phase. If params are not associated with any other
	 * autoconnect action, remove them completely. If they are, just unmark
	 * them as waiting for connection, by clearing explicit_connect field.
	 */
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	params->explicit_connect = false;

	list_del_init(&params->action);

	switch (params->auto_connect) {
	case HCI_AUTO_CONN_EXPLICIT:
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		hci_conn_params_del(conn->hdev, bdaddr, bdaddr_type);
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		/* return instead of break to avoid duplicate scan update */
		return;
	case HCI_AUTO_CONN_DIRECT:
	case HCI_AUTO_CONN_ALWAYS:
		list_add(&params->action, &conn->hdev->pend_le_conns);
		break;
	case HCI_AUTO_CONN_REPORT:
		list_add(&params->action, &conn->hdev->pend_le_reports);
		break;
	default:
		break;
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	}
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	hci_update_background_scan(conn->hdev);
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}

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static void hci_conn_cleanup(struct hci_conn *conn)
{
	struct hci_dev *hdev = conn->hdev;

	if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
		hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);

	hci_chan_list_flush(conn);

	hci_conn_hash_del(hdev, conn);

	if (hdev->notify)
		hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);

	hci_conn_del_sysfs(conn);

	debugfs_remove_recursive(conn->debugfs);

	hci_dev_put(hdev);

	hci_conn_put(conn);
}

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static void le_scan_cleanup(struct work_struct *work)
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{
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	struct hci_conn *conn = container_of(work, struct hci_conn,
					     le_scan_cleanup);
	struct hci_dev *hdev = conn->hdev;
	struct hci_conn *c = NULL;

	BT_DBG("%s hcon %p", hdev->name, conn);

	hci_dev_lock(hdev);

	/* Check that the hci_conn is still around */
	rcu_read_lock();
	list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
		if (c == conn)
			break;
	}
	rcu_read_unlock();

	if (c == conn) {
		hci_connect_le_scan_cleanup(conn);
		hci_conn_cleanup(conn);
	}

	hci_dev_unlock(hdev);
	hci_dev_put(hdev);
	hci_conn_put(conn);
}
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static void hci_connect_le_scan_remove(struct hci_conn *conn)
{
	BT_DBG("%s hcon %p", conn->hdev->name, conn);

	/* We can't call hci_conn_del/hci_conn_cleanup here since that
	 * could deadlock with another hci_conn_del() call that's holding
	 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
	 * Instead, grab temporary extra references to the hci_dev and
	 * hci_conn and perform the necessary cleanup in a separate work
	 * callback.
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	 */
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	hci_dev_hold(conn->hdev);
	hci_conn_get(conn);

	schedule_work(&conn->le_scan_cleanup);
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}

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static void hci_acl_create_connection(struct hci_conn *conn)
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{
	struct hci_dev *hdev = conn->hdev;
	struct inquiry_entry *ie;
	struct hci_cp_create_conn cp;

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	BT_DBG("hcon %p", conn);
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	conn->state = BT_CONNECT;
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	conn->out = true;
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	conn->role = HCI_ROLE_MASTER;
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	conn->attempt++;

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	conn->link_policy = hdev->link_policy;

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	memset(&cp, 0, sizeof(cp));
	bacpy(&cp.bdaddr, &conn->dst);
	cp.pscan_rep_mode = 0x02;

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	ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
	if (ie) {
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		if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
			cp.pscan_rep_mode = ie->data.pscan_rep_mode;
			cp.pscan_mode     = ie->data.pscan_mode;
			cp.clock_offset   = ie->data.clock_offset |
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					    cpu_to_le16(0x8000);
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		}

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		memcpy(conn->dev_class, ie->data.dev_class, 3);
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		if (ie->data.ssp_mode > 0)
			set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
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	}

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	cp.pkt_type = cpu_to_le16(conn->pkt_type);
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	if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
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		cp.role_switch = 0x01;
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	else
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		cp.role_switch = 0x00;
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	hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
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}

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static void hci_acl_create_connection_cancel(struct hci_conn *conn)
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{
	struct hci_cp_create_conn_cancel cp;

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	BT_DBG("hcon %p", conn);
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	if (conn->hdev->hci_ver < BLUETOOTH_VER_1_2)
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		return;

	bacpy(&cp.bdaddr, &conn->dst);
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	hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
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}

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static void hci_reject_sco(struct hci_conn *conn)
{
	struct hci_cp_reject_sync_conn_req cp;

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	cp.reason = HCI_ERROR_REJ_LIMITED_RESOURCES;
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	bacpy(&cp.bdaddr, &conn->dst);

	hci_send_cmd(conn->hdev, HCI_OP_REJECT_SYNC_CONN_REQ, sizeof(cp), &cp);
}

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int hci_disconnect(struct hci_conn *conn, __u8 reason)
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{
	struct hci_cp_disconnect cp;

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	BT_DBG("hcon %p", conn);
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	/* When we are master of an established connection and it enters
	 * the disconnect timeout, then go ahead and try to read the
	 * current clock offset.  Processing of the result is done
	 * within the event handling and hci_clock_offset_evt function.
	 */
	if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER) {
		struct hci_dev *hdev = conn->hdev;
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		struct hci_cp_read_clock_offset clkoff_cp;
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		clkoff_cp.handle = cpu_to_le16(conn->handle);
		hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
			     &clkoff_cp);
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	}

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	conn->state = BT_DISCONN;

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	cp.handle = cpu_to_le16(conn->handle);
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	cp.reason = reason;
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	return hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
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}

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static void hci_amp_disconn(struct hci_conn *conn)
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{
	struct hci_cp_disconn_phy_link cp;

	BT_DBG("hcon %p", conn);

	conn->state = BT_DISCONN;

	cp.phy_handle = HCI_PHY_HANDLE(conn->handle);
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	cp.reason = hci_proto_disconn_ind(conn);
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	hci_send_cmd(conn->hdev, HCI_OP_DISCONN_PHY_LINK,
		     sizeof(cp), &cp);
}

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static void hci_add_sco(struct hci_conn *conn, __u16 handle)
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{
	struct hci_dev *hdev = conn->hdev;
	struct hci_cp_add_sco cp;

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	BT_DBG("hcon %p", conn);
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	conn->state = BT_CONNECT;
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	conn->out = true;
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	conn->attempt++;

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	cp.handle   = cpu_to_le16(handle);
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	cp.pkt_type = cpu_to_le16(conn->pkt_type);
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	hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
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}

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bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
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{
	struct hci_dev *hdev = conn->hdev;
	struct hci_cp_setup_sync_conn cp;
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	const struct sco_param *param;
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	BT_DBG("hcon %p", conn);
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	conn->state = BT_CONNECT;
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	conn->out = true;
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	conn->attempt++;

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	cp.handle   = cpu_to_le16(handle);

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	cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
	cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
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	cp.voice_setting  = cpu_to_le16(conn->setting);

	switch (conn->setting & SCO_AIRMODE_MASK) {
	case SCO_AIRMODE_TRANSP:
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		if (conn->attempt > ARRAY_SIZE(esco_param_msbc))
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			return false;
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		param = &esco_param_msbc[conn->attempt - 1];
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		break;
	case SCO_AIRMODE_CVSD:
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		if (lmp_esco_capable(conn->link)) {
			if (conn->attempt > ARRAY_SIZE(esco_param_cvsd))
				return false;
			param = &esco_param_cvsd[conn->attempt - 1];
		} else {
			if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
				return false;
			param = &sco_param_cvsd[conn->attempt - 1];
		}
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		break;
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	default:
		return false;
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	}
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	cp.retrans_effort = param->retrans_effort;
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	cp.pkt_type = __cpu_to_le16(param->pkt_type);
	cp.max_latency = __cpu_to_le16(param->max_latency);

	if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
		return false;

	return true;
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}

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u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
		      u16 to_multiplier)
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{
	struct hci_dev *hdev = conn->hdev;
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	struct hci_conn_params *params;
	struct hci_cp_le_conn_update cp;
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	hci_dev_lock(hdev);
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	params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
	if (params) {
		params->conn_min_interval = min;
		params->conn_max_interval = max;
		params->conn_latency = latency;
		params->supervision_timeout = to_multiplier;
	}

	hci_dev_unlock(hdev);

	memset(&cp, 0, sizeof(cp));
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	cp.handle		= cpu_to_le16(conn->handle);
	cp.conn_interval_min	= cpu_to_le16(min);
	cp.conn_interval_max	= cpu_to_le16(max);
	cp.conn_latency		= cpu_to_le16(latency);
	cp.supervision_timeout	= cpu_to_le16(to_multiplier);
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	cp.min_ce_len		= cpu_to_le16(0x0000);
	cp.max_ce_len		= cpu_to_le16(0x0000);
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	hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
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	if (params)
		return 0x01;

	return 0x00;
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}

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void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
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		      __u8 ltk[16], __u8 key_size)
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{
	struct hci_dev *hdev = conn->hdev;
	struct hci_cp_le_start_enc cp;

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	BT_DBG("hcon %p", conn);
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	memset(&cp, 0, sizeof(cp));

	cp.handle = cpu_to_le16(conn->handle);
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	cp.rand = rand;
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	cp.ediv = ediv;
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	memcpy(cp.ltk, ltk, key_size);
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	hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
}

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/* Device _must_ be locked */
void hci_sco_setup(struct hci_conn *conn, __u8 status)
{
	struct hci_conn *sco = conn->link;

	if (!sco)
		return;

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	BT_DBG("hcon %p", conn);

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	if (!status) {
		if (lmp_esco_capable(conn->hdev))
			hci_setup_sync(sco, conn->handle);
		else
			hci_add_sco(sco, conn->handle);
	} else {
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		hci_connect_cfm(sco, status);
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		hci_conn_del(sco);
	}
}

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static void hci_conn_timeout(struct work_struct *work)
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{
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	struct hci_conn *conn = container_of(work, struct hci_conn,
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					     disc_work.work);
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	int refcnt = atomic_read(&conn->refcnt);
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	BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
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	WARN_ON(refcnt < 0);

	/* FIXME: It was observed that in pairing failed scenario, refcnt
	 * drops below 0. Probably this is because l2cap_conn_del calls
	 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
	 * dropped. After that loop hci_chan_del is called which also drops
	 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
	 * otherwise drop it.
	 */
	if (refcnt > 0)
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		return;

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	switch (conn->state) {
	case BT_CONNECT:
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	case BT_CONNECT2:
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		if (conn->out) {
			if (conn->type == ACL_LINK)
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				hci_acl_create_connection_cancel(conn);
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			else if (conn->type == LE_LINK) {
				if (test_bit(HCI_CONN_SCANNING, &conn->flags))
					hci_connect_le_scan_remove(conn);
				else
					hci_le_create_connection_cancel(conn);
			}
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		} else if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
			hci_reject_sco(conn);
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		}
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		break;
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	case BT_CONFIG:
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	case BT_CONNECTED:
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		if (conn->type == AMP_LINK) {
			hci_amp_disconn(conn);
		} else {
			__u8 reason = hci_proto_disconn_ind(conn);
			hci_disconnect(conn, reason);
		}
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		break;
	default:
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		conn->state = BT_CLOSED;
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		break;
	}
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}

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/* Enter sniff mode */
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static void hci_conn_idle(struct work_struct *work)
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{
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	struct hci_conn *conn = container_of(work, struct hci_conn,
					     idle_work.work);
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	struct hci_dev *hdev = conn->hdev;

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	BT_DBG("hcon %p mode %d", conn, conn->mode);
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	if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
		return;

	if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
		return;

	if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
		struct hci_cp_sniff_subrate cp;
		cp.handle             = cpu_to_le16(conn->handle);
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		cp.max_latency        = cpu_to_le16(0);
		cp.min_remote_timeout = cpu_to_le16(0);
		cp.min_local_timeout  = cpu_to_le16(0);
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		hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
	}

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	if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
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		struct hci_cp_sniff_mode cp;
		cp.handle       = cpu_to_le16(conn->handle);
		cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
		cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
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		cp.attempt      = cpu_to_le16(4);
		cp.timeout      = cpu_to_le16(1);
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		hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
	}
}

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static void hci_conn_auto_accept(struct work_struct *work)
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{
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	struct hci_conn *conn = container_of(work, struct hci_conn,
					     auto_accept_work.work);
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	hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
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		     &conn->dst);
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}

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static void le_conn_timeout(struct work_struct *work)
{
	struct hci_conn *conn = container_of(work, struct hci_conn,
					     le_conn_timeout.work);
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	struct hci_dev *hdev = conn->hdev;
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	BT_DBG("");

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	/* We could end up here due to having done directed advertising,
	 * so clean up the state if necessary. This should however only
	 * happen with broken hardware or if low duty cycle was used
	 * (which doesn't have a timeout of its own).
	 */
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	if (conn->role == HCI_ROLE_SLAVE) {
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		u8 enable = 0x00;
		hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
			     &enable);
		hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
		return;
	}

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	hci_le_create_connection_cancel(conn);
}

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struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
			      u8 role)
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{
	struct hci_conn *conn;

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	BT_DBG("%s dst %pMR", hdev->name, dst);
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	conn = kzalloc(sizeof(*conn), GFP_KERNEL);
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	if (!conn)
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		return NULL;

	bacpy(&conn->dst, dst);
568
	bacpy(&conn->src, &hdev->bdaddr);
569 570
	conn->hdev  = hdev;
	conn->type  = type;
571
	conn->role  = role;
572 573
	conn->mode  = HCI_CM_ACTIVE;
	conn->state = BT_OPEN;
574
	conn->auth_type = HCI_AT_GENERAL_BONDING;
575
	conn->io_capability = hdev->io_capability;
576
	conn->remote_auth = 0xff;
577
	conn->key_type = 0xff;
578
	conn->rssi = HCI_RSSI_INVALID;
579
	conn->tx_power = HCI_TX_POWER_INVALID;
580
	conn->max_tx_power = HCI_TX_POWER_INVALID;
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581

582
	set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
583
	conn->disc_timeout = HCI_DISCONN_TIMEOUT;
584

585 586 587
	if (conn->role == HCI_ROLE_MASTER)
		conn->out = true;

588 589 590 591
	switch (type) {
	case ACL_LINK:
		conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
		break;
592 593 594 595
	case LE_LINK:
		/* conn->src should reflect the local identity address */
		hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
		break;
596 597
	case SCO_LINK:
		if (lmp_esco_capable(hdev))
598 599
			conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
					(hdev->esco_type & EDR_ESCO_MASK);
600 601 602 603
		else
			conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
		break;
	case ESCO_LINK:
604
		conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
605 606 607
		break;
	}

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608
	skb_queue_head_init(&conn->data_q);
609

610
	INIT_LIST_HEAD(&conn->chan_list);
611

612
	INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
613
	INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
614
	INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
615
	INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
616
	INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
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617 618 619 620 621 622

	atomic_set(&conn->refcnt, 0);

	hci_dev_hold(hdev);

	hci_conn_hash_add(hdev, conn);
623
	if (hdev->notify)
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624 625
		hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);

626 627
	hci_conn_init_sysfs(conn);

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628 629 630 631 632 633 634
	return conn;
}

int hci_conn_del(struct hci_conn *conn)
{
	struct hci_dev *hdev = conn->hdev;

635
	BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
L
Linus Torvalds 已提交
636

637
	cancel_delayed_work_sync(&conn->disc_work);
638
	cancel_delayed_work_sync(&conn->auto_accept_work);
639
	cancel_delayed_work_sync(&conn->idle_work);
640

641
	if (conn->type == ACL_LINK) {
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642 643 644 645 646 647
		struct hci_conn *sco = conn->link;
		if (sco)
			sco->link = NULL;

		/* Unacked frames */
		hdev->acl_cnt += conn->sent;
648
	} else if (conn->type == LE_LINK) {
649
		cancel_delayed_work(&conn->le_conn_timeout);
650

651 652 653 654
		if (hdev->le_pkts)
			hdev->le_cnt += conn->sent;
		else
			hdev->acl_cnt += conn->sent;
655 656 657 658
	} else {
		struct hci_conn *acl = conn->link;
		if (acl) {
			acl->link = NULL;
659
			hci_conn_drop(acl);
660
		}
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661 662
	}

663 664 665
	if (conn->amp_mgr)
		amp_mgr_put(conn->amp_mgr);

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666 667
	skb_queue_purge(&conn->data_q);

668 669 670 671 672 673
	/* Remove the connection from the list and cleanup its remaining
	 * state. This is a separate function since for some cases like
	 * BT_CONNECT_SCAN we *only* want the cleanup part without the
	 * rest of hci_conn_del.
	 */
	hci_conn_cleanup(conn);
674

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675 676 677 678 679 680
	return 0;
}

struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
{
	int use_src = bacmp(src, BDADDR_ANY);
681
	struct hci_dev *hdev = NULL, *d;
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682

683
	BT_DBG("%pMR -> %pMR", src, dst);
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684

685
	read_lock(&hci_dev_list_lock);
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686

687
	list_for_each_entry(d, &hci_dev_list, list) {
688
		if (!test_bit(HCI_UP, &d->flags) ||
689
		    hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
690
		    d->dev_type != HCI_BREDR)
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691 692
			continue;

693
		/* Simple routing:
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694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
		 *   No source address - find interface with bdaddr != dst
		 *   Source address    - find interface with bdaddr == src
		 */

		if (use_src) {
			if (!bacmp(&d->bdaddr, src)) {
				hdev = d; break;
			}
		} else {
			if (bacmp(&d->bdaddr, dst)) {
				hdev = d; break;
			}
		}
	}

	if (hdev)
		hdev = hci_dev_hold(hdev);

712
	read_unlock(&hci_dev_list_lock);
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713 714 715 716
	return hdev;
}
EXPORT_SYMBOL(hci_get_route);

717
/* This function requires the caller holds hdev->lock */
718
void hci_le_conn_failed(struct hci_conn *conn, u8 status)
719 720
{
	struct hci_dev *hdev = conn->hdev;
721 722 723 724 725 726
	struct hci_conn_params *params;

	params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
					   conn->dst_type);
	if (params && params->conn) {
		hci_conn_drop(params->conn);
727
		hci_conn_put(params->conn);
728 729
		params->conn = NULL;
	}
730 731 732 733 734 735

	conn->state = BT_CLOSED;

	mgmt_connect_failed(hdev, &conn->dst, conn->type, conn->dst_type,
			    status);

736
	hci_connect_cfm(conn, status);
737 738

	hci_conn_del(conn);
739 740 741 742 743

	/* Since we may have temporarily stopped the background scanning in
	 * favor of connection establishment, we should restart it.
	 */
	hci_update_background_scan(hdev);
744 745 746 747 748

	/* Re-enable advertising in case this was a failed connection
	 * attempt as a peripheral.
	 */
	mgmt_reenable_advertising(hdev);
749 750
}

751
static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
752 753 754
{
	struct hci_conn *conn;

755 756 757 758 759 760 761 762
	hci_dev_lock(hdev);

	conn = hci_lookup_le_connect(hdev);

	if (!status) {
		hci_connect_le_scan_cleanup(conn);
		goto done;
	}
763 764 765 766 767 768 769

	BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
	       status);

	if (!conn)
		goto done;

770
	hci_le_conn_failed(conn, status);
771 772 773 774 775

done:
	hci_dev_unlock(hdev);
}

776 777 778 779 780 781 782 783 784 785
static void hci_req_add_le_create_conn(struct hci_request *req,
				       struct hci_conn *conn)
{
	struct hci_cp_le_create_conn cp;
	struct hci_dev *hdev = conn->hdev;
	u8 own_addr_type;

	memset(&cp, 0, sizeof(cp));

	/* Update random address, but set require_privacy to false so
786
	 * that we never connect with an non-resolvable address.
787 788 789 790 791 792 793 794 795 796 797
	 */
	if (hci_update_random_address(req, false, &own_addr_type))
		return;

	cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
	cp.scan_window = cpu_to_le16(hdev->le_scan_window);
	bacpy(&cp.peer_addr, &conn->dst);
	cp.peer_addr_type = conn->dst_type;
	cp.own_address_type = own_addr_type;
	cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
	cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
798 799
	cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
	cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
800 801
	cp.min_ce_len = cpu_to_le16(0x0000);
	cp.max_ce_len = cpu_to_le16(0x0000);
802 803

	hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
804 805

	conn->state = BT_CONNECT;
806
	clear_bit(HCI_CONN_SCANNING, &conn->flags);
807 808
}

809 810 811 812 813 814 815 816
static void hci_req_directed_advertising(struct hci_request *req,
					 struct hci_conn *conn)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_le_set_adv_param cp;
	u8 own_addr_type;
	u8 enable;

817
	/* Clear the HCI_LE_ADV bit temporarily so that the
818 819 820 821
	 * hci_update_random_address knows that it's safe to go ahead
	 * and write a new random address. The flag will be set back on
	 * as soon as the SET_ADV_ENABLE HCI command completes.
	 */
822
	hci_dev_clear_flag(hdev, HCI_LE_ADV);
823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844

	/* Set require_privacy to false so that the remote device has a
	 * chance of identifying us.
	 */
	if (hci_update_random_address(req, false, &own_addr_type) < 0)
		return;

	memset(&cp, 0, sizeof(cp));
	cp.type = LE_ADV_DIRECT_IND;
	cp.own_address_type = own_addr_type;
	cp.direct_addr_type = conn->dst_type;
	bacpy(&cp.direct_addr, &conn->dst);
	cp.channel_map = hdev->le_adv_channel_map;

	hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);

	enable = 0x01;
	hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);

	conn->state = BT_CONNECT;
}

845
struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
846
				u8 dst_type, u8 sec_level, u16 conn_timeout,
847
				u8 role)
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Linus Torvalds 已提交
848
{
849
	struct hci_conn_params *params;
850
	struct hci_conn *conn, *conn_unfinished;
851
	struct smp_irk *irk;
852
	struct hci_request req;
853
	int err;
L
Linus Torvalds 已提交
854

855
	/* Let's make sure that le is enabled.*/
856
	if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
857 858 859 860 861 862
		if (lmp_le_capable(hdev))
			return ERR_PTR(-ECONNREFUSED);

		return ERR_PTR(-EOPNOTSUPP);
	}

A
Andre Guedes 已提交
863 864 865 866 867 868 869 870 871
	/* Some devices send ATT messages as soon as the physical link is
	 * established. To be able to handle these ATT messages, the user-
	 * space first establishes the connection and then starts the pairing
	 * process.
	 *
	 * So if a hci_conn object already exists for the following connection
	 * attempt, we simply update pending_sec_level and auth_type fields
	 * and return the object found.
	 */
872
	conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
873
	conn_unfinished = NULL;
A
Andre Guedes 已提交
874
	if (conn) {
875 876 877 878 879 880 881 882 883
		if (conn->state == BT_CONNECT &&
		    test_bit(HCI_CONN_SCANNING, &conn->flags)) {
			BT_DBG("will continue unfinished conn %pMR", dst);
			conn_unfinished = conn;
		} else {
			if (conn->pending_sec_level < sec_level)
				conn->pending_sec_level = sec_level;
			goto done;
		}
A
Andre Guedes 已提交
884
	}
885

A
Andre Guedes 已提交
886 887 888
	/* Since the controller supports only one LE connection attempt at a
	 * time, we return -EBUSY if there is any connection attempt running.
	 */
889
	if (hci_lookup_le_connect(hdev))
A
Andre Guedes 已提交
890
		return ERR_PTR(-EBUSY);
891

892 893 894 895 896 897 898 899 900
	/* When given an identity address with existing identity
	 * resolving key, the connection needs to be established
	 * to a resolvable random address.
	 *
	 * Storing the resolvable random address is required here
	 * to handle connection failures. The address will later
	 * be resolved back into the original identity address
	 * from the connect request.
	 */
901 902 903 904 905 906
	irk = hci_find_irk_by_addr(hdev, dst, dst_type);
	if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
		dst = &irk->rpa;
		dst_type = ADDR_LE_DEV_RANDOM;
	}

907 908 909 910 911 912 913
	if (conn_unfinished) {
		conn = conn_unfinished;
		bacpy(&conn->dst, dst);
	} else {
		conn = hci_conn_add(hdev, LE_LINK, dst, role);
	}

A
Andre Guedes 已提交
914 915
	if (!conn)
		return ERR_PTR(-ENOMEM);
916

917
	conn->dst_type = dst_type;
A
Andre Guedes 已提交
918
	conn->sec_level = BT_SECURITY_LOW;
919
	conn->conn_timeout = conn_timeout;
920

921 922 923
	if (!conn_unfinished)
		conn->pending_sec_level = sec_level;

924 925
	hci_req_init(&req, hdev);

926 927 928 929 930 931
	/* Disable advertising if we're active. For master role
	 * connections most controllers will refuse to connect if
	 * advertising is enabled, and for slave role connections we
	 * anyway have to disable it in order to start directed
	 * advertising.
	 */
932
	if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
933 934 935 936 937
		u8 enable = 0x00;
		hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
			    &enable);
	}

938
	/* If requested to connect as slave use directed advertising */
939
	if (conn->role == HCI_ROLE_SLAVE) {
940 941 942
		/* If we're active scanning most controllers are unable
		 * to initiate advertising. Simply reject the attempt.
		 */
943
		if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
944 945 946 947 948 949
		    hdev->le_scan_type == LE_SCAN_ACTIVE) {
			skb_queue_purge(&req.cmd_q);
			hci_conn_del(conn);
			return ERR_PTR(-EBUSY);
		}

950 951 952 953
		hci_req_directed_advertising(&req, conn);
		goto create_conn;
	}

954 955 956 957
	params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
	if (params) {
		conn->le_conn_min_interval = params->conn_min_interval;
		conn->le_conn_max_interval = params->conn_max_interval;
958 959
		conn->le_conn_latency = params->conn_latency;
		conn->le_supv_timeout = params->supervision_timeout;
960 961 962
	} else {
		conn->le_conn_min_interval = hdev->le_conn_min_interval;
		conn->le_conn_max_interval = hdev->le_conn_max_interval;
963 964
		conn->le_conn_latency = hdev->le_conn_latency;
		conn->le_supv_timeout = hdev->le_supv_timeout;
965
	}
966

967
	/* If controller is scanning, we stop it since some controllers are
968 969 970 971
	 * not able to scan and connect at the same time. Also set the
	 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
	 * handler for scan disabling knows to set the correct discovery
	 * state.
972
	 */
973
	if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
974
		hci_req_add_le_scan_disable(&req);
975
		hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
976 977
	}

978 979
	hci_req_add_le_create_conn(&req, conn);

980
create_conn:
981
	err = hci_req_run(&req, create_le_conn_complete);
982 983
	if (err) {
		hci_conn_del(conn);
A
Andre Guedes 已提交
984
		return ERR_PTR(err);
985
	}
V
Ville Tervo 已提交
986

A
Andre Guedes 已提交
987
done:
988 989 990 991 992 993 994
	/* If this is continuation of connect started by hci_connect_le_scan,
	 * it already called hci_conn_hold and calling it again would mess the
	 * counter.
	 */
	if (!conn_unfinished)
		hci_conn_hold(conn);

995
	return conn;
996
}
V
Ville Tervo 已提交
997

998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
static void hci_connect_le_scan_complete(struct hci_dev *hdev, u8 status,
					 u16 opcode)
{
	struct hci_conn *conn;

	if (!status)
		return;

	BT_ERR("Failed to add device to auto conn whitelist: status 0x%2.2x",
	       status);

	hci_dev_lock(hdev);

	conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
	if (conn)
		hci_le_conn_failed(conn, status);

	hci_dev_unlock(hdev);
}

static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
{
	struct hci_conn *conn;

1022
	conn = hci_conn_hash_lookup_le(hdev, addr, type);
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
	if (!conn)
		return false;

	if (conn->state != BT_CONNECTED)
		return false;

	return true;
}

/* This function requires the caller holds hdev->lock */
static int hci_explicit_conn_params_set(struct hci_request *req,
					bdaddr_t *addr, u8 addr_type)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_conn_params *params;

	if (is_connected(hdev, addr, addr_type))
		return -EISCONN;

1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
	params = hci_conn_params_lookup(hdev, addr, addr_type);
	if (!params) {
		params = hci_conn_params_add(hdev, addr, addr_type);
		if (!params)
			return -ENOMEM;

		/* If we created new params, mark them to be deleted in
		 * hci_connect_le_scan_cleanup. It's different case than
		 * existing disabled params, those will stay after cleanup.
		 */
		params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
	}
1054

1055
	/* We're trying to connect, so make sure params are at pend_le_conns */
1056
	if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1057 1058
	    params->auto_connect == HCI_AUTO_CONN_REPORT ||
	    params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
		list_del_init(&params->action);
		list_add(&params->action, &hdev->pend_le_conns);
	}

	params->explicit_connect = true;
	__hci_update_background_scan(req);

	BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
	       params->auto_connect);

	return 0;
}

/* This function requires the caller holds hdev->lock */
struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
				     u8 dst_type, u8 sec_level,
				     u16 conn_timeout, u8 role)
{
	struct hci_conn *conn;
	struct hci_request req;
	int err;

	/* Let's make sure that le is enabled.*/
	if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
		if (lmp_le_capable(hdev))
			return ERR_PTR(-ECONNREFUSED);

		return ERR_PTR(-EOPNOTSUPP);
	}

	/* Some devices send ATT messages as soon as the physical link is
	 * established. To be able to handle these ATT messages, the user-
	 * space first establishes the connection and then starts the pairing
	 * process.
	 *
	 * So if a hci_conn object already exists for the following connection
	 * attempt, we simply update pending_sec_level and auth_type fields
	 * and return the object found.
	 */
1098
	conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
	if (conn) {
		if (conn->pending_sec_level < sec_level)
			conn->pending_sec_level = sec_level;
		goto done;
	}

	BT_DBG("requesting refresh of dst_addr");

	conn = hci_conn_add(hdev, LE_LINK, dst, role);
	if (!conn)
		return ERR_PTR(-ENOMEM);

	hci_req_init(&req, hdev);

	if (hci_explicit_conn_params_set(&req, dst, dst_type) < 0)
		return ERR_PTR(-EBUSY);

	conn->state = BT_CONNECT;
	set_bit(HCI_CONN_SCANNING, &conn->flags);

	err = hci_req_run(&req, hci_connect_le_scan_complete);
	if (err && err != -ENODATA) {
		hci_conn_del(conn);
		return ERR_PTR(err);
	}

	conn->dst_type = dst_type;
	conn->sec_level = BT_SECURITY_LOW;
	conn->pending_sec_level = sec_level;
	conn->conn_timeout = conn_timeout;

done:
	hci_conn_hold(conn);
	return conn;
}

1135 1136
struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
				 u8 sec_level, u8 auth_type)
L
Linus Torvalds 已提交
1137 1138
{
	struct hci_conn *acl;
V
Ville Tervo 已提交
1139

1140
	if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1141 1142 1143
		if (lmp_bredr_capable(hdev))
			return ERR_PTR(-ECONNREFUSED);

1144
		return ERR_PTR(-EOPNOTSUPP);
1145
	}
1146

A
Andrei Emeltchenko 已提交
1147 1148
	acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
	if (!acl) {
1149
		acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
A
Andrei Emeltchenko 已提交
1150
		if (!acl)
1151
			return ERR_PTR(-ENOMEM);
L
Linus Torvalds 已提交
1152 1153 1154 1155
	}

	hci_conn_hold(acl);

1156
	if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1157 1158
		acl->sec_level = BT_SECURITY_LOW;
		acl->pending_sec_level = sec_level;
1159
		acl->auth_type = auth_type;
1160
		hci_acl_create_connection(acl);
1161
	}
L
Linus Torvalds 已提交
1162

1163 1164 1165
	return acl;
}

1166 1167
struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
				 __u16 setting)
1168 1169 1170 1171
{
	struct hci_conn *acl;
	struct hci_conn *sco;

1172
	acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1173
	if (IS_ERR(acl))
1174
		return acl;
L
Linus Torvalds 已提交
1175

A
Andrei Emeltchenko 已提交
1176 1177
	sco = hci_conn_hash_lookup_ba(hdev, type, dst);
	if (!sco) {
1178
		sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
A
Andrei Emeltchenko 已提交
1179
		if (!sco) {
1180
			hci_conn_drop(acl);
1181
			return ERR_PTR(-ENOMEM);
L
Linus Torvalds 已提交
1182
		}
1183
	}
L
Linus Torvalds 已提交
1184

1185 1186
	acl->link = sco;
	sco->link = acl;
L
Linus Torvalds 已提交
1187

1188
	hci_conn_hold(sco);
L
Linus Torvalds 已提交
1189

1190 1191
	sco->setting = setting;

1192
	if (acl->state == BT_CONNECTED &&
1193
	    (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1194
		set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1195
		hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1196

1197
		if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1198
			/* defer SCO setup until mode change completed */
1199
			set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1200 1201 1202 1203
			return sco;
		}

		hci_sco_setup(acl, 0x00);
1204
	}
1205 1206

	return sco;
L
Linus Torvalds 已提交
1207 1208
}

1209 1210 1211
/* Check link security requirement */
int hci_conn_check_link_mode(struct hci_conn *conn)
{
1212
	BT_DBG("hcon %p", conn);
1213

1214 1215 1216 1217
	/* In Secure Connections Only mode, it is required that Secure
	 * Connections is used and the link is encrypted with AES-CCM
	 * using a P-256 authenticated combination key.
	 */
1218
	if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1219 1220 1221 1222 1223 1224
		if (!hci_conn_sc_enabled(conn) ||
		    !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
		    conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
			return 0;
	}

1225 1226
	if (hci_conn_ssp_enabled(conn) &&
	    !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1227 1228 1229 1230 1231
		return 0;

	return 1;
}

L
Linus Torvalds 已提交
1232
/* Authenticate remote device */
1233
static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
L
Linus Torvalds 已提交
1234
{
1235
	BT_DBG("hcon %p", conn);
L
Linus Torvalds 已提交
1236

1237 1238 1239
	if (conn->pending_sec_level > sec_level)
		sec_level = conn->pending_sec_level;

1240
	if (sec_level > conn->sec_level)
1241
		conn->pending_sec_level = sec_level;
1242
	else if (test_bit(HCI_CONN_AUTH, &conn->flags))
L
Linus Torvalds 已提交
1243 1244
		return 1;

1245 1246 1247
	/* Make sure we preserve an existing MITM requirement*/
	auth_type |= (conn->auth_type & 0x01);

1248 1249
	conn->auth_type = auth_type;

1250
	if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
L
Linus Torvalds 已提交
1251
		struct hci_cp_auth_requested cp;
1252

1253
		cp.handle = cpu_to_le16(conn->handle);
1254
		hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1255
			     sizeof(cp), &cp);
1256 1257 1258 1259

		/* If we're already encrypted set the REAUTH_PEND flag,
		 * otherwise set the ENCRYPT_PEND.
		 */
1260
		if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1261
			set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1262 1263
		else
			set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
L
Linus Torvalds 已提交
1264
	}
1265

L
Linus Torvalds 已提交
1266 1267 1268
	return 0;
}

1269 1270 1271
/* Encrypt the the link */
static void hci_conn_encrypt(struct hci_conn *conn)
{
1272
	BT_DBG("hcon %p", conn);
1273

1274
	if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1275 1276 1277 1278
		struct hci_cp_set_conn_encrypt cp;
		cp.handle  = cpu_to_le16(conn->handle);
		cp.encrypt = 0x01;
		hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1279
			     &cp);
1280 1281 1282
	}
}

1283
/* Enable security */
1284 1285
int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
		      bool initiator)
L
Linus Torvalds 已提交
1286
{
1287
	BT_DBG("hcon %p", conn);
L
Linus Torvalds 已提交
1288

1289 1290 1291
	if (conn->type == LE_LINK)
		return smp_conn_security(conn, sec_level);

1292
	/* For sdp we don't need the link key. */
1293 1294 1295
	if (sec_level == BT_SECURITY_SDP)
		return 1;

1296 1297
	/* For non 2.1 devices and low security level we don't need the link
	   key. */
1298
	if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1299
		return 1;
1300

1301
	/* For other security levels we need the link key. */
1302
	if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1303 1304
		goto auth;

1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315
	/* An authenticated FIPS approved combination key has sufficient
	 * security for security level 4. */
	if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
	    sec_level == BT_SECURITY_FIPS)
		goto encrypt;

	/* An authenticated combination key has sufficient security for
	   security level 3. */
	if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
	     conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
	    sec_level == BT_SECURITY_HIGH)
1316 1317 1318 1319
		goto encrypt;

	/* An unauthenticated combination key has sufficient security for
	   security level 1 and 2. */
1320 1321
	if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
	     conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1322
	    (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1323 1324 1325 1326 1327 1328 1329
		goto encrypt;

	/* A combination key has always sufficient security for the security
	   levels 1 or 2. High security level requires the combination key
	   is generated using maximum PIN code length (16).
	   For pre 2.1 units. */
	if (conn->key_type == HCI_LK_COMBINATION &&
1330 1331
	    (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
	     conn->pin_length == 16))
1332 1333 1334
		goto encrypt;

auth:
1335
	if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
L
Linus Torvalds 已提交
1336 1337
		return 0;

1338 1339 1340
	if (initiator)
		set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);

1341 1342
	if (!hci_conn_auth(conn, sec_level, auth_type))
		return 0;
1343 1344

encrypt:
1345
	if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1346
		return 1;
1347

1348
	hci_conn_encrypt(conn);
L
Linus Torvalds 已提交
1349 1350
	return 0;
}
1351
EXPORT_SYMBOL(hci_conn_security);
L
Linus Torvalds 已提交
1352

1353 1354 1355
/* Check secure link requirement */
int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
{
1356
	BT_DBG("hcon %p", conn);
1357

1358 1359 1360
	/* Accept if non-secure or higher security level is required */
	if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
		return 1;
1361

1362 1363 1364
	/* Accept if secure or higher security level is already present */
	if (conn->sec_level == BT_SECURITY_HIGH ||
	    conn->sec_level == BT_SECURITY_FIPS)
1365 1366
		return 1;

1367 1368
	/* Reject not secure link */
	return 0;
1369 1370 1371
}
EXPORT_SYMBOL(hci_conn_check_secure);

L
Linus Torvalds 已提交
1372
/* Switch role */
1373
int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
L
Linus Torvalds 已提交
1374
{
1375
	BT_DBG("hcon %p", conn);
L
Linus Torvalds 已提交
1376

1377
	if (role == conn->role)
L
Linus Torvalds 已提交
1378 1379
		return 1;

1380
	if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
L
Linus Torvalds 已提交
1381 1382 1383
		struct hci_cp_switch_role cp;
		bacpy(&cp.bdaddr, &conn->dst);
		cp.role = role;
1384
		hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
L
Linus Torvalds 已提交
1385
	}
1386

L
Linus Torvalds 已提交
1387 1388 1389 1390
	return 0;
}
EXPORT_SYMBOL(hci_conn_switch_role);

1391
/* Enter active mode */
1392
void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1393 1394 1395
{
	struct hci_dev *hdev = conn->hdev;

1396
	BT_DBG("hcon %p mode %d", conn, conn->mode);
1397

1398 1399 1400
	if (conn->mode != HCI_CM_SNIFF)
		goto timer;

1401
	if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1402 1403
		goto timer;

1404
	if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1405
		struct hci_cp_exit_sniff_mode cp;
1406
		cp.handle = cpu_to_le16(conn->handle);
1407
		hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1408 1409 1410 1411
	}

timer:
	if (hdev->idle_timeout > 0)
1412 1413
		queue_delayed_work(hdev->workqueue, &conn->idle_work,
				   msecs_to_jiffies(hdev->idle_timeout));
1414 1415
}

L
Linus Torvalds 已提交
1416 1417 1418 1419
/* Drop all connection on the device */
void hci_conn_hash_flush(struct hci_dev *hdev)
{
	struct hci_conn_hash *h = &hdev->conn_hash;
1420
	struct hci_conn *c, *n;
L
Linus Torvalds 已提交
1421 1422 1423

	BT_DBG("hdev %s", hdev->name);

1424
	list_for_each_entry_safe(c, n, &h->list, list) {
L
Linus Torvalds 已提交
1425 1426
		c->state = BT_CLOSED;

1427
		hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
L
Linus Torvalds 已提交
1428 1429 1430 1431
		hci_conn_del(c);
	}
}

1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442
/* Check pending connect attempts */
void hci_conn_check_pending(struct hci_dev *hdev)
{
	struct hci_conn *conn;

	BT_DBG("hdev %s", hdev->name);

	hci_dev_lock(hdev);

	conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
	if (conn)
1443
		hci_acl_create_connection(conn);
1444 1445 1446 1447

	hci_dev_unlock(hdev);
}

1448 1449 1450 1451
static u32 get_link_mode(struct hci_conn *conn)
{
	u32 link_mode = 0;

1452
	if (conn->role == HCI_ROLE_MASTER)
1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
		link_mode |= HCI_LM_MASTER;

	if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
		link_mode |= HCI_LM_ENCRYPT;

	if (test_bit(HCI_CONN_AUTH, &conn->flags))
		link_mode |= HCI_LM_AUTH;

	if (test_bit(HCI_CONN_SECURE, &conn->flags))
		link_mode |= HCI_LM_SECURE;

	if (test_bit(HCI_CONN_FIPS, &conn->flags))
		link_mode |= HCI_LM_FIPS;

	return link_mode;
}

L
Linus Torvalds 已提交
1470 1471
int hci_get_conn_list(void __user *arg)
{
1472
	struct hci_conn *c;
L
Linus Torvalds 已提交
1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485
	struct hci_conn_list_req req, *cl;
	struct hci_conn_info *ci;
	struct hci_dev *hdev;
	int n = 0, size, err;

	if (copy_from_user(&req, arg, sizeof(req)))
		return -EFAULT;

	if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
		return -EINVAL;

	size = sizeof(req) + req.conn_num * sizeof(*ci);

A
Andrei Emeltchenko 已提交
1486 1487
	cl = kmalloc(size, GFP_KERNEL);
	if (!cl)
L
Linus Torvalds 已提交
1488 1489
		return -ENOMEM;

A
Andrei Emeltchenko 已提交
1490 1491
	hdev = hci_dev_get(req.dev_id);
	if (!hdev) {
L
Linus Torvalds 已提交
1492 1493 1494 1495 1496 1497
		kfree(cl);
		return -ENODEV;
	}

	ci = cl->conn_info;

1498
	hci_dev_lock(hdev);
1499
	list_for_each_entry(c, &hdev->conn_hash.list, list) {
L
Linus Torvalds 已提交
1500 1501 1502 1503 1504
		bacpy(&(ci + n)->bdaddr, &c->dst);
		(ci + n)->handle = c->handle;
		(ci + n)->type  = c->type;
		(ci + n)->out   = c->out;
		(ci + n)->state = c->state;
1505
		(ci + n)->link_mode = get_link_mode(c);
L
Linus Torvalds 已提交
1506 1507 1508
		if (++n >= req.conn_num)
			break;
	}
1509
	hci_dev_unlock(hdev);
L
Linus Torvalds 已提交
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532

	cl->dev_id = hdev->id;
	cl->conn_num = n;
	size = sizeof(req) + n * sizeof(*ci);

	hci_dev_put(hdev);

	err = copy_to_user(arg, cl, size);
	kfree(cl);

	return err ? -EFAULT : 0;
}

int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
{
	struct hci_conn_info_req req;
	struct hci_conn_info ci;
	struct hci_conn *conn;
	char __user *ptr = arg + sizeof(req);

	if (copy_from_user(&req, arg, sizeof(req)))
		return -EFAULT;

1533
	hci_dev_lock(hdev);
L
Linus Torvalds 已提交
1534 1535 1536 1537 1538 1539 1540
	conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
	if (conn) {
		bacpy(&ci.bdaddr, &conn->dst);
		ci.handle = conn->handle;
		ci.type  = conn->type;
		ci.out   = conn->out;
		ci.state = conn->state;
1541
		ci.link_mode = get_link_mode(conn);
L
Linus Torvalds 已提交
1542
	}
1543
	hci_dev_unlock(hdev);
L
Linus Torvalds 已提交
1544 1545 1546 1547 1548 1549

	if (!conn)
		return -ENOENT;

	return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
}
1550 1551 1552 1553 1554 1555 1556 1557 1558

int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
{
	struct hci_auth_info_req req;
	struct hci_conn *conn;

	if (copy_from_user(&req, arg, sizeof(req)))
		return -EFAULT;

1559
	hci_dev_lock(hdev);
1560 1561 1562
	conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
	if (conn)
		req.type = conn->auth_type;
1563
	hci_dev_unlock(hdev);
1564 1565 1566 1567 1568 1569

	if (!conn)
		return -ENOENT;

	return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
}
1570 1571 1572 1573 1574 1575

struct hci_chan *hci_chan_create(struct hci_conn *conn)
{
	struct hci_dev *hdev = conn->hdev;
	struct hci_chan *chan;

1576
	BT_DBG("%s hcon %p", hdev->name, conn);
1577

1578 1579 1580 1581 1582
	if (test_bit(HCI_CONN_DROP, &conn->flags)) {
		BT_DBG("Refusing to create new hci_chan");
		return NULL;
	}

1583
	chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1584 1585 1586
	if (!chan)
		return NULL;

1587
	chan->conn = hci_conn_get(conn);
1588
	skb_queue_head_init(&chan->data_q);
M
Mat Martineau 已提交
1589
	chan->state = BT_CONNECTED;
1590

1591
	list_add_rcu(&chan->list, &conn->chan_list);
1592 1593 1594 1595

	return chan;
}

1596
void hci_chan_del(struct hci_chan *chan)
1597 1598 1599 1600
{
	struct hci_conn *conn = chan->conn;
	struct hci_dev *hdev = conn->hdev;

1601
	BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1602

1603 1604 1605
	list_del_rcu(&chan->list);

	synchronize_rcu();
1606

1607
	/* Prevent new hci_chan's to be created for this hci_conn */
1608
	set_bit(HCI_CONN_DROP, &conn->flags);
1609

1610
	hci_conn_put(conn);
1611

1612 1613 1614 1615
	skb_queue_purge(&chan->data_q);
	kfree(chan);
}

1616
void hci_chan_list_flush(struct hci_conn *conn)
1617
{
1618
	struct hci_chan *chan, *n;
1619

1620
	BT_DBG("hcon %p", conn);
1621

1622
	list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1623 1624
		hci_chan_del(chan);
}
1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656

static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
						 __u16 handle)
{
	struct hci_chan *hchan;

	list_for_each_entry(hchan, &hcon->chan_list, list) {
		if (hchan->handle == handle)
			return hchan;
	}

	return NULL;
}

struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
{
	struct hci_conn_hash *h = &hdev->conn_hash;
	struct hci_conn *hcon;
	struct hci_chan *hchan = NULL;

	rcu_read_lock();

	list_for_each_entry_rcu(hcon, &h->list, list) {
		hchan = __hci_chan_lookup_handle(hcon, handle);
		if (hchan)
			break;
	}

	rcu_read_unlock();

	return hchan;
}