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hci_conn.c
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/*
BlueZ - Bluetooth protocol stack for Linux
Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
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
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
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
SOFTWARE IS DISCLAIMED.
*/
/* Bluetooth HCI connection handling. */
#include <linux/export.h>
#include <linux/debugfs.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>
#include "hci_request.h"
#include "smp.h"
#include "a2mp.h"
struct sco_param {
u16 pkt_type;
u16 max_latency;
u8 retrans_effort;
};
static const struct sco_param esco_param_cvsd[] = {
{ 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 */
};
static const struct sco_param sco_param_cvsd[] = {
{ EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
{ EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
};
static const struct sco_param esco_param_msbc[] = {
{ EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
{ EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
};
/* 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 hci_dev *hdev = conn->hdev;
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(hdev, bdaddr, bdaddr_type);
if (irk) {
bdaddr = &irk->bdaddr;
bdaddr_type = irk->addr_type;
}
params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
bdaddr_type);
if (!params || !params->explicit_connect)
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.
*/
params->explicit_connect = false;
list_del_init(¶ms->action);
switch (params->auto_connect) {
case HCI_AUTO_CONN_EXPLICIT:
hci_conn_params_del(hdev, bdaddr, bdaddr_type);
/* return instead of break to avoid duplicate scan update */
return;
case HCI_AUTO_CONN_DIRECT:
case HCI_AUTO_CONN_ALWAYS:
list_add(¶ms->action, &hdev->pend_le_conns);
break;
case HCI_AUTO_CONN_REPORT:
list_add(¶ms->action, &hdev->pend_le_reports);
break;
default:
break;
}
hci_update_background_scan(hdev);
}
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);
}
static void le_scan_cleanup(struct work_struct *work)
{
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);
}
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.
*/
hci_dev_hold(conn->hdev);
hci_conn_get(conn);
/* Even though we hold a reference to the hdev, many other
* things might get cleaned up meanwhile, including the hdev's
* own workqueue, so we can't use that for scheduling.
*/
schedule_work(&conn->le_scan_cleanup);
}
static void hci_acl_create_connection(struct hci_conn *conn)
{
struct hci_dev *hdev = conn->hdev;
struct inquiry_entry *ie;
struct hci_cp_create_conn cp;
BT_DBG("hcon %p", conn);
conn->state = BT_CONNECT;
conn->out = true;
conn->role = HCI_ROLE_MASTER;
conn->attempt++;
conn->link_policy = hdev->link_policy;
memset(&cp, 0, sizeof(cp));
bacpy(&cp.bdaddr, &conn->dst);
cp.pscan_rep_mode = 0x02;
ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
if (ie) {
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 |
cpu_to_le16(0x8000);
}
memcpy(conn->dev_class, ie->data.dev_class, 3);
if (ie->data.ssp_mode > 0)
set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
}
cp.pkt_type = cpu_to_le16(conn->pkt_type);
if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
cp.role_switch = 0x01;
else
cp.role_switch = 0x00;
hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
}
int hci_disconnect(struct hci_conn *conn, __u8 reason)
{
BT_DBG("hcon %p", conn);
/* 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 &&
(conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
struct hci_dev *hdev = conn->hdev;
struct hci_cp_read_clock_offset clkoff_cp;
clkoff_cp.handle = cpu_to_le16(conn->handle);
hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
&clkoff_cp);
}
return hci_abort_conn(conn, reason);
}
static void hci_add_sco(struct hci_conn *conn, __u16 handle)
{
struct hci_dev *hdev = conn->hdev;
struct hci_cp_add_sco cp;
BT_DBG("hcon %p", conn);
conn->state = BT_CONNECT;
conn->out = true;
conn->attempt++;
cp.handle = cpu_to_le16(handle);
cp.pkt_type = cpu_to_le16(conn->pkt_type);
hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
}
bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
{
struct hci_dev *hdev = conn->hdev;
struct hci_cp_setup_sync_conn cp;
const struct sco_param *param;
BT_DBG("hcon %p", conn);
conn->state = BT_CONNECT;
conn->out = true;
conn->attempt++;
cp.handle = cpu_to_le16(handle);
cp.tx_bandwidth = cpu_to_le32(0x00001f40);
cp.rx_bandwidth = cpu_to_le32(0x00001f40);
cp.voice_setting = cpu_to_le16(conn->setting);
switch (conn->setting & SCO_AIRMODE_MASK) {
case SCO_AIRMODE_TRANSP:
if (conn->attempt > ARRAY_SIZE(esco_param_msbc))
return false;
param = &esco_param_msbc[conn->attempt - 1];
break;
case SCO_AIRMODE_CVSD:
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];
}
break;
default:
return false;
}
cp.retrans_effort = param->retrans_effort;
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;
}
u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
u16 to_multiplier)
{
struct hci_dev *hdev = conn->hdev;
struct hci_conn_params *params;
struct hci_cp_le_conn_update cp;
hci_dev_lock(hdev);
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));
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);
cp.min_ce_len = cpu_to_le16(0x0000);
cp.max_ce_len = cpu_to_le16(0x0000);
hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
if (params)
return 0x01;
return 0x00;
}
void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
__u8 ltk[16], __u8 key_size)
{
struct hci_dev *hdev = conn->hdev;
struct hci_cp_le_start_enc cp;
BT_DBG("hcon %p", conn);
memset(&cp, 0, sizeof(cp));
cp.handle = cpu_to_le16(conn->handle);
cp.rand = rand;
cp.ediv = ediv;
memcpy(cp.ltk, ltk, key_size);
hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
}
/* Device _must_ be locked */
void hci_sco_setup(struct hci_conn *conn, __u8 status)
{
struct hci_conn *sco = conn->link;
if (!sco)
return;
BT_DBG("hcon %p", conn);
if (!status) {
if (lmp_esco_capable(conn->hdev))
hci_setup_sync(sco, conn->handle);
else
hci_add_sco(sco, conn->handle);
} else {
hci_connect_cfm(sco, status);
hci_conn_del(sco);
}
}
static void hci_conn_timeout(struct work_struct *work)
{
struct hci_conn *conn = container_of(work, struct hci_conn,
disc_work.work);
int refcnt = atomic_read(&conn->refcnt);
BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
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)
return;
/* LE connections in scanning state need special handling */
if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
test_bit(HCI_CONN_SCANNING, &conn->flags)) {
hci_connect_le_scan_remove(conn);
return;
}
hci_abort_conn(conn, hci_proto_disconn_ind(conn));
}
/* Enter sniff mode */
static void hci_conn_idle(struct work_struct *work)
{
struct hci_conn *conn = container_of(work, struct hci_conn,
idle_work.work);
struct hci_dev *hdev = conn->hdev;
BT_DBG("hcon %p mode %d", conn, conn->mode);
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);
cp.max_latency = cpu_to_le16(0);
cp.min_remote_timeout = cpu_to_le16(0);
cp.min_local_timeout = cpu_to_le16(0);
hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
}
if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
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);
cp.attempt = cpu_to_le16(4);
cp.timeout = cpu_to_le16(1);
hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
}
}
static void hci_conn_auto_accept(struct work_struct *work)
{
struct hci_conn *conn = container_of(work, struct hci_conn,
auto_accept_work.work);
hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
&conn->dst);
}
static void le_conn_timeout(struct work_struct *work)
{
struct hci_conn *conn = container_of(work, struct hci_conn,
le_conn_timeout.work);
struct hci_dev *hdev = conn->hdev;
BT_DBG("");
/* 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).
*/
if (conn->role == HCI_ROLE_SLAVE) {
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;
}
hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
}
struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
u8 role)
{
struct hci_conn *conn;
BT_DBG("%s dst %pMR", hdev->name, dst);
conn = kzalloc(sizeof(*conn), GFP_KERNEL);
if (!conn)
return NULL;
bacpy(&conn->dst, dst);
bacpy(&conn->src, &hdev->bdaddr);
conn->hdev = hdev;
conn->type = type;
conn->role = role;
conn->mode = HCI_CM_ACTIVE;
conn->state = BT_OPEN;
conn->auth_type = HCI_AT_GENERAL_BONDING;
conn->io_capability = hdev->io_capability;
conn->remote_auth = 0xff;
conn->key_type = 0xff;
conn->rssi = HCI_RSSI_INVALID;
conn->tx_power = HCI_TX_POWER_INVALID;
conn->max_tx_power = HCI_TX_POWER_INVALID;
set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
conn->disc_timeout = HCI_DISCONN_TIMEOUT;
if (conn->role == HCI_ROLE_MASTER)
conn->out = true;
switch (type) {
case ACL_LINK:
conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
break;
case LE_LINK:
/* conn->src should reflect the local identity address */
hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
break;
case SCO_LINK:
if (lmp_esco_capable(hdev))
conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
(hdev->esco_type & EDR_ESCO_MASK);
else
conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
break;
case ESCO_LINK:
conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
break;
}
skb_queue_head_init(&conn->data_q);
INIT_LIST_HEAD(&conn->chan_list);
INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
atomic_set(&conn->refcnt, 0);
hci_dev_hold(hdev);
hci_conn_hash_add(hdev, conn);
if (hdev->notify)
hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
hci_conn_init_sysfs(conn);
return conn;
}
int hci_conn_del(struct hci_conn *conn)
{
struct hci_dev *hdev = conn->hdev;
BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
cancel_delayed_work_sync(&conn->disc_work);
cancel_delayed_work_sync(&conn->auto_accept_work);
cancel_delayed_work_sync(&conn->idle_work);
if (conn->type == ACL_LINK) {
struct hci_conn *sco = conn->link;
if (sco)
sco->link = NULL;
/* Unacked frames */
hdev->acl_cnt += conn->sent;
} else if (conn->type == LE_LINK) {
cancel_delayed_work(&conn->le_conn_timeout);
if (hdev->le_pkts)
hdev->le_cnt += conn->sent;
else
hdev->acl_cnt += conn->sent;
} else {
struct hci_conn *acl = conn->link;
if (acl) {
acl->link = NULL;
hci_conn_drop(acl);
}
}
if (conn->amp_mgr)
amp_mgr_put(conn->amp_mgr);
skb_queue_purge(&conn->data_q);
/* 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);
return 0;
}
struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
{
int use_src = bacmp(src, BDADDR_ANY);
struct hci_dev *hdev = NULL, *d;
BT_DBG("%pMR -> %pMR", src, dst);
read_lock(&hci_dev_list_lock);
list_for_each_entry(d, &hci_dev_list, list) {
if (!test_bit(HCI_UP, &d->flags) ||
hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
d->dev_type != HCI_PRIMARY)
continue;
/* Simple routing:
* 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);
read_unlock(&hci_dev_list_lock);
return hdev;
}
EXPORT_SYMBOL(hci_get_route);
/* This function requires the caller holds hdev->lock */
void hci_le_conn_failed(struct hci_conn *conn, u8 status)
{
struct hci_dev *hdev = conn->hdev;
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);
hci_conn_put(params->conn);
params->conn = NULL;
}
conn->state = BT_CLOSED;
/* If the status indicates successful cancellation of
* the attempt (i.e. Unkown Connection Id) there's no point of
* notifying failure since we'll go back to keep trying to
* connect. The only exception is explicit connect requests
* where a timeout + cancel does indicate an actual failure.
*/
if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
(params && params->explicit_connect))
mgmt_connect_failed(hdev, &conn->dst, conn->type,
conn->dst_type, status);
hci_connect_cfm(conn, status);
hci_conn_del(conn);
/* Since we may have temporarily stopped the background scanning in
* favor of connection establishment, we should restart it.
*/
hci_update_background_scan(hdev);
/* Re-enable advertising in case this was a failed connection
* attempt as a peripheral.
*/
hci_req_reenable_advertising(hdev);
}
static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
{
struct hci_conn *conn;
hci_dev_lock(hdev);
conn = hci_lookup_le_connect(hdev);
if (!status) {
hci_connect_le_scan_cleanup(conn);
goto done;
}
BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
status);
if (!conn)
goto done;
hci_le_conn_failed(conn, status);
done:
hci_dev_unlock(hdev);
}
static bool conn_use_rpa(struct hci_conn *conn)
{
struct hci_dev *hdev = conn->hdev;
return hci_dev_test_flag(hdev, HCI_PRIVACY);
}
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;
/* Update random address, but set require_privacy to false so
* that we never connect with an non-resolvable address.
*/
if (hci_update_random_address(req, false, conn_use_rpa(conn),
&own_addr_type))
return;
memset(&cp, 0, sizeof(cp));
/* Set window to be the same value as the interval to enable
* continuous scanning.
*/
cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
cp.scan_window = cp.scan_interval;
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);
cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
cp.min_ce_len = cpu_to_le16(0x0000);
cp.max_ce_len = cpu_to_le16(0x0000);
hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
conn->state = BT_CONNECT;
clear_bit(HCI_CONN_SCANNING, &conn->flags);
}
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;
/* Clear the HCI_LE_ADV bit temporarily so that the
* 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.
*/
hci_dev_clear_flag(hdev, HCI_LE_ADV);
/* Set require_privacy to false so that the remote device has a
* chance of identifying us.
*/
if (hci_update_random_address(req, false, conn_use_rpa(conn),
&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;
}
struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
u8 dst_type, u8 sec_level, u16 conn_timeout,
u8 role)
{
struct hci_conn_params *params;
struct hci_conn *conn;
struct smp_irk *irk;
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);
}
/* Since the controller supports only one LE connection attempt at a
* time, we return -EBUSY if there is any connection attempt running.
*/
if (hci_lookup_le_connect(hdev))
return ERR_PTR(-EBUSY);
/* If there's already a connection object but it's not in
* scanning state it means it must already be established, in
* which case we can't do anything else except report a failure
* to connect.
*/
conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
return ERR_PTR(-EBUSY);
}
/* 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.
*/
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;
}
if (conn) {
bacpy(&conn->dst, dst);
} else {
conn = hci_conn_add(hdev, LE_LINK, dst, role);
if (!conn)
return ERR_PTR(-ENOMEM);
hci_conn_hold(conn);
conn->pending_sec_level = sec_level;
}
conn->dst_type = dst_type;
conn->sec_level = BT_SECURITY_LOW;
conn->conn_timeout = conn_timeout;
hci_req_init(&req, hdev);
/* 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.
*/
if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
u8 enable = 0x00;
hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
&enable);
}
/* If requested to connect as slave use directed advertising */
if (conn->role == HCI_ROLE_SLAVE) {
/* If we're active scanning most controllers are unable
* to initiate advertising. Simply reject the attempt.
*/
if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
hdev->le_scan_type == LE_SCAN_ACTIVE) {
skb_queue_purge(&req.cmd_q);
hci_conn_del(conn);
return ERR_PTR(-EBUSY);
}
hci_req_directed_advertising(&req, conn);
goto create_conn;
}
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;
conn->le_conn_latency = params->conn_latency;
conn->le_supv_timeout = params->supervision_timeout;
} else {
conn->le_conn_min_interval = hdev->le_conn_min_interval;
conn->le_conn_max_interval = hdev->le_conn_max_interval;
conn->le_conn_latency = hdev->le_conn_latency;
conn->le_supv_timeout = hdev->le_supv_timeout;
}
/* If controller is scanning, we stop it since some controllers are
* 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.
*/
if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
hci_req_add_le_scan_disable(&req);
hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
}
hci_req_add_le_create_conn(&req, conn);
create_conn:
err = hci_req_run(&req, create_le_conn_complete);
if (err) {
hci_conn_del(conn);
return ERR_PTR(err);
}
return conn;
}
static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
{
struct hci_conn *conn;
conn = hci_conn_hash_lookup_le(hdev, addr, type);
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_dev *hdev,
bdaddr_t *addr, u8 addr_type)
{
struct hci_conn_params *params;
if (is_connected(hdev, addr, addr_type))
return -EISCONN;
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;
}
/* We're trying to connect, so make sure params are at pend_le_conns */
if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
params->auto_connect == HCI_AUTO_CONN_REPORT ||
params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
list_del_init(¶ms->action);
list_add(¶ms->action, &hdev->pend_le_conns);
}
params->explicit_connect = true;
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)
{
struct hci_conn *conn;
/* 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