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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.
*/
package com.android.server.wifi;
import static android.net.wifi.WifiManager.WIFI_FEATURE_CONTROL_ROAMING;
import android.util.Log;
import com.android.internal.annotations.VisibleForTesting;
import java.util.ArrayList;
/**
* This class provides helper functions for Wifi connectivity related modules to
* access WifiNative. It starts with firmware roaming. TODO(b/34819513): Move operations
* such as connection to network and legacy framework roaming here.
*
* NOTE: This class is not thread safe and should only be used from the ClientModeImpl thread.
*/
public class WifiConnectivityHelper {
private static final String TAG = "WifiConnectivityHelper";
@VisibleForTesting
public static int INVALID_LIST_SIZE = -1;
private final WifiNative mWifiNative;
private boolean mFirmwareRoamingSupported = false;
private int mMaxNumBlacklistBssid = INVALID_LIST_SIZE;
private int mMaxNumWhitelistSsid = INVALID_LIST_SIZE;
WifiConnectivityHelper(WifiNative wifiNative) {
mWifiNative = wifiNative;
}
/**
* Query firmware if it supports
* {@link android.net.wifi.WifiManager#WIFI_FEATURE_CONTROL_ROAMING}. If yes, get the firmware
* roaming capabilities. If firmware roaming is supported but we fail to get the roaming
* capabilities or the returned capability values are invalid, we fall back to framework
* roaming.
*
* @return true if succeed, false if firmware roaming is supported but fail to get valid
* roaming capabilities.
*/
public boolean getFirmwareRoamingInfo() {
mFirmwareRoamingSupported = false;
mMaxNumBlacklistBssid = INVALID_LIST_SIZE;
mMaxNumWhitelistSsid = INVALID_LIST_SIZE;
long fwFeatureSet =
mWifiNative.getSupportedFeatureSet(mWifiNative.getClientInterfaceName());
Log.d(TAG, "Firmware supported feature set: " + Long.toHexString(fwFeatureSet));
if ((fwFeatureSet & WIFI_FEATURE_CONTROL_ROAMING) == 0) {
Log.d(TAG, "Firmware roaming is not supported");
return true;
}
WifiNative.RoamingCapabilities roamingCap = new WifiNative.RoamingCapabilities();
if (mWifiNative.getRoamingCapabilities(mWifiNative.getClientInterfaceName(), roamingCap)) {
if (roamingCap.maxBlacklistSize < 0 || roamingCap.maxWhitelistSize < 0) {
Log.e(TAG, "Invalid firmware roaming capabilities: max num blacklist bssid="
+ roamingCap.maxBlacklistSize + " max num whitelist ssid="
+ roamingCap.maxWhitelistSize);
} else {
mFirmwareRoamingSupported = true;
mMaxNumBlacklistBssid = roamingCap.maxBlacklistSize;
mMaxNumWhitelistSsid = roamingCap.maxWhitelistSize;
Log.d(TAG, "Firmware roaming supported with capabilities: max num blacklist bssid="
+ mMaxNumBlacklistBssid + " max num whitelist ssid="
+ mMaxNumWhitelistSsid);
return true;
}
} else {
Log.e(TAG, "Failed to get firmware roaming capabilities");
}
return false;
}
/**
* Return if firmware roaming is supported.
*/
public boolean isFirmwareRoamingSupported() {
return mFirmwareRoamingSupported;
}
/**
* Get the maximum size of BSSID blacklist firmware supports.
*
* @return INVALID_LIST_SIZE if firmware roaming is not supported, or
* maximum size of the BSSID blacklist firmware supports.
*/
public int getMaxNumBlacklistBssid() {
if (mFirmwareRoamingSupported) {
return mMaxNumBlacklistBssid;
} else {
Log.e(TAG, "getMaxNumBlacklistBssid: Firmware roaming is not supported");
return INVALID_LIST_SIZE;
}
}
/**
* Get the maximum size of SSID whitelist firmware supports.
*
* @return INVALID_LIST_SIZE if firmware roaming is not supported, or
* maximum size of the SSID whitelist firmware supports.
*/
public int getMaxNumWhitelistSsid() {
if (mFirmwareRoamingSupported) {
return mMaxNumWhitelistSsid;
} else {
Log.e(TAG, "getMaxNumWhitelistSsid: Firmware roaming is not supported");
return INVALID_LIST_SIZE;
}
}
/**
* Write firmware roaming configuration to firmware.
*
* @param blacklistBssids BSSIDs to be blacklisted
* @param whitelistSsids SSIDs to be whitelisted
* @return true if succeeded, false otherwise.
*/
public boolean setFirmwareRoamingConfiguration(ArrayList<String> blacklistBssids,
ArrayList<String> whitelistSsids) {
if (!mFirmwareRoamingSupported) {
Log.e(TAG, "Firmware roaming is not supported");
return false;
}
if (blacklistBssids == null || whitelistSsids == null) {
Log.e(TAG, "Invalid firmware roaming configuration settings");
return false;
}
int blacklistSize = blacklistBssids.size();
int whitelistSize = whitelistSsids.size();
if (blacklistSize > mMaxNumBlacklistBssid || whitelistSize > mMaxNumWhitelistSsid) {
Log.e(TAG, "Invalid BSSID blacklist size " + blacklistSize + " SSID whitelist size "
+ whitelistSize + ". Max blacklist size: " + mMaxNumBlacklistBssid
+ ", max whitelist size: " + mMaxNumWhitelistSsid);
return false;
}
WifiNative.RoamingConfig roamConfig = new WifiNative.RoamingConfig();
roamConfig.blacklistBssids = blacklistBssids;
roamConfig.whitelistSsids = whitelistSsids;
return mWifiNative.configureRoaming(mWifiNative.getClientInterfaceName(), roamConfig);
}
/**
* Remove the request |networkId| from supplicant if it's the current network,
* if the current configured network matches |networkId|.
*
* @param networkId network id of the network to be removed from supplicant.
*/
public void removeNetworkIfCurrent(int networkId) {
mWifiNative.removeNetworkIfCurrent(mWifiNative.getClientInterfaceName(), networkId);
}
}
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