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/******************************************************************************
*
* Copyright 1999-2012 Broadcom Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/******************************************************************************
*
* This file contains functions for BLE acceptlist operation.
*
******************************************************************************/
#include <base/bind.h>
#include <base/logging.h>
#include <cstdint>
#include <unordered_map>
#include "device/include/controller.h"
#include "main/shim/acl_api.h"
#include "main/shim/shim.h"
#include "stack/btm/btm_dev.h"
#include "stack/btm/btm_int_types.h"
#include "stack/btm/security_device_record.h"
#include "stack/include/bt_types.h"
#include "types/raw_address.h"
extern tBTM_CB btm_cb;
extern void btm_ble_create_conn_cancel();
namespace {
} // namespace
// Unfortunately (for now?) we have to maintain a copy of the device acceptlist
// on the host to determine if a device is pending to be connected or not. This
// controls whether the host should keep trying to scan for acceptlisted
// peripherals or not.
// TODO: Move all of this to controller/le/background_list or similar?
struct BackgroundConnection {
RawAddress address;
uint8_t addr_type;
bool in_controller_wl;
uint8_t addr_type_in_wl;
bool pending_removal;
};
struct BgConnHash {
std::size_t operator()(const RawAddress& x) const {
const uint8_t* a = x.address;
return a[0] ^ (a[1] << 8) ^ (a[2] << 16) ^ (a[3] << 24) ^ a[4] ^
(a[5] << 8);
}
};
static std::unordered_map<RawAddress, BackgroundConnection, BgConnHash>
background_connections;
const tBLE_BD_ADDR convert_to_address_with_type(
const RawAddress& bd_addr, const tBTM_SEC_DEV_REC* p_dev_rec) {
if (p_dev_rec == nullptr || !p_dev_rec->is_device_type_has_ble()) {
return {
.type = BLE_ADDR_PUBLIC,
.bda = bd_addr,
};
}
if (p_dev_rec->ble.identity_address_with_type.bda.IsEmpty()) {
return {
.type = p_dev_rec->ble.AddressType(),
.bda = bd_addr,
};
} else {
return p_dev_rec->ble.identity_address_with_type;
}
}
/*******************************************************************************
*
* Function btm_update_scanner_filter_policy
*
* Description This function updates the filter policy of scanner
******************************************************************************/
void btm_update_scanner_filter_policy(tBTM_BLE_SFP scan_policy) {
tBTM_BLE_INQ_CB* p_inq = &btm_cb.ble_ctr_cb.inq_var;
uint32_t scan_interval =
!p_inq->scan_interval ? BTM_BLE_GAP_DISC_SCAN_INT : p_inq->scan_interval;
uint32_t scan_window =
!p_inq->scan_window ? BTM_BLE_GAP_DISC_SCAN_WIN : p_inq->scan_window;
BTM_TRACE_EVENT("%s", __func__);
p_inq->sfp = scan_policy;
p_inq->scan_type = p_inq->scan_type == BTM_BLE_SCAN_MODE_NONE
? BTM_BLE_SCAN_MODE_ACTI
: p_inq->scan_type;
btm_send_hci_set_scan_params(
p_inq->scan_type, (uint16_t)scan_interval, (uint16_t)scan_window,
btm_cb.ble_ctr_cb.addr_mgnt_cb.own_addr_type, scan_policy);
}
/*******************************************************************************
*
* Function btm_ble_suspend_bg_conn
*
* Description This function is to suspend an active background connection
* procedure.
*
* Parameters none.
*
* Returns none.
*
******************************************************************************/
bool btm_ble_suspend_bg_conn(void) {
LOG_DEBUG("Gd acl_manager handles sync of background connections");
return true;
}
/*******************************************************************************
*
* Function btm_ble_resume_bg_conn
*
* Description This function is to resume a background auto connection
* procedure.
*
* Parameters none.
*
* Returns none.
*
******************************************************************************/
bool btm_ble_resume_bg_conn(void) {
LOG_DEBUG("Gd acl_manager handles sync of background connections");
return true;
}
bool BTM_BackgroundConnectAddressKnown(const RawAddress& address) {
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(address);
// not a known device, or a classic device, we assume public address
if (p_dev_rec == NULL || (p_dev_rec->device_type & BT_DEVICE_TYPE_BLE) == 0)
return true;
// bonded device with identity address known
if (!p_dev_rec->ble.identity_address_with_type.bda.IsEmpty()) {
return true;
}
// Public address, Random Static, or Random Non-Resolvable Address known
if (p_dev_rec->ble.AddressType() == BLE_ADDR_PUBLIC ||
!BTM_BLE_IS_RESOLVE_BDA(address)) {
return true;
}
// Only Resolvable Private Address (RPA) is known, we don't allow it into
// the background connection procedure.
return false;
}
bool BTM_SetLeConnectionModeToFast() {
VLOG(2) << __func__;
tBTM_BLE_CB* p_cb = &btm_cb.ble_ctr_cb;
if ((p_cb->scan_int == BTM_BLE_SCAN_PARAM_UNDEF &&
p_cb->scan_win == BTM_BLE_SCAN_PARAM_UNDEF) ||
(p_cb->scan_int == BTM_BLE_SCAN_SLOW_INT_1 &&
p_cb->scan_win == BTM_BLE_SCAN_SLOW_WIN_1)) {
p_cb->scan_int = BTM_BLE_SCAN_FAST_INT;
p_cb->scan_win = BTM_BLE_SCAN_FAST_WIN;
return true;
}
return false;
}
void BTM_SetLeConnectionModeToSlow() {
VLOG(2) << __func__;
tBTM_BLE_CB* p_cb = &btm_cb.ble_ctr_cb;
if ((p_cb->scan_int == BTM_BLE_SCAN_PARAM_UNDEF &&
p_cb->scan_win == BTM_BLE_SCAN_PARAM_UNDEF) ||
(p_cb->scan_int == BTM_BLE_SCAN_FAST_INT &&
p_cb->scan_win == BTM_BLE_SCAN_FAST_WIN)) {
p_cb->scan_int = BTM_BLE_SCAN_SLOW_INT_1;
p_cb->scan_win = BTM_BLE_SCAN_SLOW_WIN_1;
}
}
/** Adds the device into acceptlist. Returns false if acceptlist is full and
* device can't be added, true otherwise. */
bool BTM_AcceptlistAdd(const RawAddress& address) {
if (!controller_get_interface()->supports_ble()) {
LOG_WARN("Controller does not support Le");
return false;
}
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(address);
if (p_dev_rec != NULL && p_dev_rec->device_type & BT_DEVICE_TYPE_BLE) {
p_dev_rec->ble.in_controller_list |= BTM_ACCEPTLIST_BIT;
}
return bluetooth::shim::ACL_AcceptLeConnectionFrom(
convert_to_address_with_type(address, p_dev_rec),
/* is_direct */ false);
}
/** Removes the device from acceptlist */
void BTM_AcceptlistRemove(const RawAddress& address) {
if (!controller_get_interface()->supports_ble()) {
LOG_WARN("Controller does not support Le");
return;
}
tBTM_SEC_DEV_REC* p_dev_rec = btm_find_dev(address);
if (p_dev_rec != NULL && p_dev_rec->device_type & BT_DEVICE_TYPE_BLE) {
p_dev_rec->ble.in_controller_list &= ~BTM_ACCEPTLIST_BIT;
}
bluetooth::shim::ACL_IgnoreLeConnectionFrom(
convert_to_address_with_type(address, p_dev_rec));
return;
}
/** Clear the acceptlist, end any pending acceptlist connections */
void BTM_AcceptlistClear() {
if (!controller_get_interface()->supports_ble()) {
LOG_WARN("Controller does not support Le");
return;
}
bluetooth::shim::ACL_IgnoreAllLeConnections();
}
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