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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.
Copyright 2023 NXP
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 <net/bluetooth/iso.h>
#include <net/bluetooth/mgmt.h>
#include "hci_request.h"
#include "smp.h"
#include "a2mp.h"
#include "eir.h"
struct sco_param {
u16 pkt_type;
u16 max_latency;
u8 retrans_effort;
};
struct conn_handle_t {
struct hci_conn *conn;
__u16 handle;
};
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, u8 status)
{
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)
return;
if (params->conn) {
hci_conn_drop(params->conn);
hci_conn_put(params->conn);
params->conn = NULL;
}
if (!params->explicit_connect)
return;
/* If the status indicates successful cancellation of
* the attempt (i.e. Unknown 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 && status != HCI_ERROR_UNKNOWN_CONN_ID)
mgmt_connect_failed(hdev, &conn->dst, conn->type,
conn->dst_type, status);
/* 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_passive_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);
if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
hci_remove_link_key(hdev, &conn->dst);
hci_chan_list_flush(conn);
hci_conn_hash_del(hdev, conn);
if (conn->cleanup)
conn->cleanup(conn);
if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
switch (conn->setting & SCO_AIRMODE_MASK) {
case SCO_AIRMODE_CVSD:
case SCO_AIRMODE_TRANSP:
if (hdev->notify)
hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
break;
}
} else {
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, 0x00);
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);
/* Many controllers disallow HCI Create Connection while it is doing
* HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create
* Connection. This may cause the MGMT discovering state to become false
* without user space's request but it is okay since the MGMT Discovery
* APIs do not promise that discovery should be done forever. Instead,
* the user space monitors the status of MGMT discovering and it may
* request for discovery again when this flag becomes false.
*/
if (test_bit(HCI_INQUIRY, &hdev->flags)) {
/* Put this connection to "pending" state so that it will be
* executed after the inquiry cancel command complete event.
*/
conn->state = BT_CONNECT2;
hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL);
return;
}
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);
}
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 central 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);
}
static bool find_next_esco_param(struct hci_conn *conn,
const struct sco_param *esco_param, int size)
{
for (; conn->attempt <= size; conn->attempt++) {
if (lmp_esco_2m_capable(conn->link) ||
(esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
break;
BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
conn, conn->attempt);
}
return conn->attempt <= size;
}
static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec)
{
int err;
__u8 vnd_len, *vnd_data = NULL;
struct hci_op_configure_data_path *cmd = NULL;
err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len,
&vnd_data);
if (err < 0)
goto error;
cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL);
if (!cmd) {
err = -ENOMEM;
goto error;
}
err = hdev->get_data_path_id(hdev, &cmd->data_path_id);
if (err < 0)
goto error;
cmd->vnd_len = vnd_len;
memcpy(cmd->vnd_data, vnd_data, vnd_len);
cmd->direction = 0x00;
__hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
sizeof(*cmd) + vnd_len, cmd, HCI_CMD_TIMEOUT);
cmd->direction = 0x01;
err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
sizeof(*cmd) + vnd_len, cmd,
HCI_CMD_TIMEOUT);
error:
kfree(cmd);
kfree(vnd_data);
return err;
}
static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data)
{
struct conn_handle_t *conn_handle = data;
struct hci_conn *conn = conn_handle->conn;
__u16 handle = conn_handle->handle;
struct hci_cp_enhanced_setup_sync_conn cp;
const struct sco_param *param;
kfree(conn_handle);
bt_dev_dbg(hdev, "hcon %p", conn);
/* for offload use case, codec needs to configured before opening SCO */
if (conn->codec.data_path)
configure_datapath_sync(hdev, &conn->codec);
conn->state = BT_CONNECT;
conn->out = true;
conn->attempt++;
memset(&cp, 0x00, sizeof(cp));
cp.handle = cpu_to_le16(handle);
cp.tx_bandwidth = cpu_to_le32(0x00001f40);
cp.rx_bandwidth = cpu_to_le32(0x00001f40);
switch (conn->codec.id) {
case BT_CODEC_MSBC:
if (!find_next_esco_param(conn, esco_param_msbc,
ARRAY_SIZE(esco_param_msbc)))
return -EINVAL;
param = &esco_param_msbc[conn->attempt - 1];
cp.tx_coding_format.id = 0x05;
cp.rx_coding_format.id = 0x05;
cp.tx_codec_frame_size = __cpu_to_le16(60);
cp.rx_codec_frame_size = __cpu_to_le16(60);
cp.in_bandwidth = __cpu_to_le32(32000);
cp.out_bandwidth = __cpu_to_le32(32000);
cp.in_coding_format.id = 0x04;
cp.out_coding_format.id = 0x04;
cp.in_coded_data_size = __cpu_to_le16(16);
cp.out_coded_data_size = __cpu_to_le16(16);
cp.in_pcm_data_format = 2;
cp.out_pcm_data_format = 2;
cp.in_pcm_sample_payload_msb_pos = 0;
cp.out_pcm_sample_payload_msb_pos = 0;
cp.in_data_path = conn->codec.data_path;
cp.out_data_path = conn->codec.data_path;
cp.in_transport_unit_size = 1;
cp.out_transport_unit_size = 1;
break;
case BT_CODEC_TRANSPARENT:
if (!find_next_esco_param(conn, esco_param_msbc,
ARRAY_SIZE(esco_param_msbc)))
return false;
param = &esco_param_msbc[conn->attempt - 1];
cp.tx_coding_format.id = 0x03;
cp.rx_coding_format.id = 0x03;
cp.tx_codec_frame_size = __cpu_to_le16(60);
cp.rx_codec_frame_size = __cpu_to_le16(60);
cp.in_bandwidth = __cpu_to_le32(0x1f40);
cp.out_bandwidth = __cpu_to_le32(0x1f40);
cp.in_coding_format.id = 0x03;
cp.out_coding_format.id = 0x03;
cp.in_coded_data_size = __cpu_to_le16(16);
cp.out_coded_data_size = __cpu_to_le16(16);
cp.in_pcm_data_format = 2;
cp.out_pcm_data_format = 2;
cp.in_pcm_sample_payload_msb_pos = 0;
cp.out_pcm_sample_payload_msb_pos = 0;
cp.in_data_path = conn->codec.data_path;
cp.out_data_path = conn->codec.data_path;
cp.in_transport_unit_size = 1;
cp.out_transport_unit_size = 1;
break;
case BT_CODEC_CVSD:
if (lmp_esco_capable(conn->link)) {
if (!find_next_esco_param(conn, esco_param_cvsd,
ARRAY_SIZE(esco_param_cvsd)))
return -EINVAL;
param = &esco_param_cvsd[conn->attempt - 1];
} else {
if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
return -EINVAL;
param = &sco_param_cvsd[conn->attempt - 1];
}
cp.tx_coding_format.id = 2;
cp.rx_coding_format.id = 2;
cp.tx_codec_frame_size = __cpu_to_le16(60);
cp.rx_codec_frame_size = __cpu_to_le16(60);
cp.in_bandwidth = __cpu_to_le32(16000);
cp.out_bandwidth = __cpu_to_le32(16000);
cp.in_coding_format.id = 4;
cp.out_coding_format.id = 4;
cp.in_coded_data_size = __cpu_to_le16(16);
cp.out_coded_data_size = __cpu_to_le16(16);
cp.in_pcm_data_format = 2;
cp.out_pcm_data_format = 2;
cp.in_pcm_sample_payload_msb_pos = 0;
cp.out_pcm_sample_payload_msb_pos = 0;
cp.in_data_path = conn->codec.data_path;
cp.out_data_path = conn->codec.data_path;
cp.in_transport_unit_size = 16;
cp.out_transport_unit_size = 16;
break;
default:
return -EINVAL;
}
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_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
return -EIO;
return 0;
}
static bool hci_setup_sync_conn(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_dev_dbg(hdev, "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 (!find_next_esco_param(conn, esco_param_msbc,
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 (!find_next_esco_param(conn, esco_param_cvsd,
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;
}
bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
{
int result;
struct conn_handle_t *conn_handle;
if (enhanced_sync_conn_capable(conn->hdev)) {
conn_handle = kzalloc(sizeof(*conn_handle), GFP_KERNEL);
if (!conn_handle)
return false;
conn_handle->conn = conn;
conn_handle->handle = handle;
result = hci_cmd_sync_queue(conn->hdev, hci_enhanced_setup_sync,
conn_handle, NULL);
if (result < 0)
kfree(conn_handle);
return result == 0;
}
return hci_setup_sync_conn(conn, handle);
}
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_disable_advertising(struct hci_dev *hdev)
{
if (ext_adv_capable(hdev)) {
struct hci_cp_le_set_ext_adv_enable cp;
cp.enable = 0x00;
cp.num_of_sets = 0x00;
hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
&cp);
} else {
u8 enable = 0x00;
hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
&enable);
}
}
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) {
/* Disable LE Advertising */
le_disable_advertising(hdev);
hci_dev_lock(hdev);
hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
hci_dev_unlock(hdev);
return;
}
hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
}
struct iso_list_data {
union {
u8 cig;
u8 big;
};
union {
u8 cis;
u8 bis;
u16 sync_handle;
};
int count;
struct {
struct hci_cp_le_set_cig_params cp;
struct hci_cis_params cis[0x11];
} pdu;
};
static void bis_list(struct hci_conn *conn, void *data)
{
struct iso_list_data *d = data;
/* Skip if not broadcast/ANY address */
if (bacmp(&conn->dst, BDADDR_ANY))
return;
if (d->big != conn->iso_qos.bcast.big || d->bis == BT_ISO_QOS_BIS_UNSET ||
d->bis != conn->iso_qos.bcast.bis)
return;
d->count++;
}
static void find_bis(struct hci_conn *conn, void *data)
{
struct iso_list_data *d = data;
/* Ignore unicast */
if (bacmp(&conn->dst, BDADDR_ANY))
return;
d->count++;
}
static int terminate_big_sync(struct hci_dev *hdev, void *data)
{
struct iso_list_data *d = data;
bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis);
hci_remove_ext_adv_instance_sync(hdev, d->bis, NULL);
/* Check if ISO connection is a BIS and terminate BIG if there are
* no other connections using it.
*/
hci_conn_hash_list_state(hdev, find_bis, ISO_LINK, BT_CONNECTED, d);
if (d->count)
return 0;
return hci_le_terminate_big_sync(hdev, d->big,
HCI_ERROR_LOCAL_HOST_TERM);
}
static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err)
{
kfree(data);
}
static int hci_le_terminate_big(struct hci_dev *hdev, u8 big, u8 bis)
{
struct iso_list_data *d;
int ret;
bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", big, bis);
d = kzalloc(sizeof(*d), GFP_KERNEL);
if (!d)
return -ENOMEM;
d->big = big;
d->bis = bis;
ret = hci_cmd_sync_queue(hdev, terminate_big_sync, d,
terminate_big_destroy);
if (ret)
kfree(d);
return ret;
}
static int big_terminate_sync(struct hci_dev *hdev, void *data)
{
struct iso_list_data *d = data;
bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big,
d->sync_handle);
/* Check if ISO connection is a BIS and terminate BIG if there are
* no other connections using it.
*/
hci_conn_hash_list_state(hdev, find_bis, ISO_LINK, BT_CONNECTED, d);
if (d->count)
return 0;
hci_le_big_terminate_sync(hdev, d->big);
return hci_le_pa_terminate_sync(hdev, d->sync_handle);
}
static int hci_le_big_terminate(struct hci_dev *hdev, u8 big, u16 sync_handle)
{
struct iso_list_data *d;
int ret;
bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", big, sync_handle);
d = kzalloc(sizeof(*d), GFP_KERNEL);
if (!d)
return -ENOMEM;
d->big = big;
d->sync_handle = sync_handle;
ret = hci_cmd_sync_queue(hdev, big_terminate_sync, d,
terminate_big_destroy);
if (ret)
kfree(d);
return ret;
}
/* Cleanup BIS connection
*
* Detects if there any BIS left connected in a BIG
* broadcaster: Remove advertising instance and terminate BIG.
* broadcaster receiver: Teminate BIG sync and terminate PA sync.
*/
static void bis_cleanup(struct hci_conn *conn)
{
struct hci_dev *hdev = conn->hdev;
bt_dev_dbg(hdev, "conn %p", conn);
if (conn->role == HCI_ROLE_MASTER) {
if (!test_and_clear_bit(HCI_CONN_PER_ADV, &conn->flags))
return;
hci_le_terminate_big(hdev, conn->iso_qos.bcast.big,
conn->iso_qos.bcast.bis);
} else {
hci_le_big_terminate(hdev, conn->iso_qos.bcast.big,
conn->sync_handle);
}
}
static int remove_cig_sync(struct hci_dev *hdev, void *data)
{
u8 handle = PTR_ERR(data);
return hci_le_remove_cig_sync(hdev, handle);
}
static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle)
{
bt_dev_dbg(hdev, "handle 0x%2.2x", handle);
return hci_cmd_sync_queue(hdev, remove_cig_sync, ERR_PTR(handle), NULL);
}
static void find_cis(struct hci_conn *conn, void *data)
{
struct iso_list_data *d = data;
/* Ignore broadcast */
if (!bacmp(&conn->dst, BDADDR_ANY))
return;
d->count++;
}
/* Cleanup CIS connection:
*
* Detects if there any CIS left connected in a CIG and remove it.
*/
static void cis_cleanup(struct hci_conn *conn)
{
struct hci_dev *hdev = conn->hdev;
struct iso_list_data d;
memset(&d, 0, sizeof(d));
d.cig = conn->iso_qos.ucast.cig;
/* Check if ISO connection is a CIS and remove CIG if there are
* no other connections using it.
*/
hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECTED, &d);
if (d.count)
return;
hci_le_remove_cig(hdev, conn->iso_qos.ucast.cig);
}
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->handle = HCI_CONN_HANDLE_UNSET;
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;