/*
 * Copyright (C) 2010 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 android.net.wifi;

import static android.net.wifi.WifiManager.WIFI_STATE_DISABLED;
import static android.net.wifi.WifiManager.WIFI_STATE_DISABLING;
import static android.net.wifi.WifiManager.WIFI_STATE_ENABLED;
import static android.net.wifi.WifiManager.WIFI_STATE_ENABLING;
import static android.net.wifi.WifiManager.WIFI_STATE_UNKNOWN;

/**
 * TODO:
 * Deprecate WIFI_STATE_UNKNOWN
 */
import static android.net.wifi.WifiManager.WIFI_AP_STATE_DISABLED;
import static android.net.wifi.WifiManager.WIFI_AP_STATE_DISABLING;
import static android.net.wifi.WifiManager.WIFI_AP_STATE_ENABLED;
import static android.net.wifi.WifiManager.WIFI_AP_STATE_ENABLING;
import static android.net.wifi.WifiManager.WIFI_AP_STATE_FAILED;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.backup.IBackupManager;
import android.bluetooth.BluetoothAdapter;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.database.ContentObserver;
import android.net.ConnectivityManager;
import android.net.DhcpResults;
import android.net.DhcpStateMachine;
import android.net.InterfaceConfiguration;
import android.net.LinkAddress;
import android.net.LinkProperties;
import android.net.NetworkInfo;
import android.net.NetworkInfo.DetailedState;
import android.net.NetworkUtils;
import android.net.RouteInfo;
import android.net.wifi.WpsResult.Status;
import android.net.wifi.p2p.WifiP2pManager;
import android.net.wifi.p2p.WifiP2pService;
import android.os.BatteryStats;
import android.os.Binder;
import android.os.IBinder;
import android.os.INetworkManagementService;
import android.os.Message;
import android.os.Messenger;
import android.os.PowerManager;
import android.os.Process;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.os.UserHandle;
import android.os.WorkSource;
import android.provider.Settings;
import android.util.Log;
import android.util.LruCache;
import android.text.TextUtils;

import com.android.internal.R;
import com.android.internal.app.IBatteryStats;
import com.android.internal.util.AsyncChannel;
import com.android.internal.util.Protocol;
import com.android.internal.util.State;
import com.android.internal.util.StateMachine;

import com.android.server.net.BaseNetworkObserver;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Inet6Address;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.Iterator;
import java.util.regex.Pattern;

/**
 * Track the state of Wifi connectivity. All event handling is done here,
 * and all changes in connectivity state are initiated here.
 *
 * Wi-Fi now supports three modes of operation: Client, SoftAp and p2p
 * In the current implementation, we support concurrent wifi p2p and wifi operation.
 * The WifiStateMachine handles SoftAp and Client operations while WifiP2pService
 * handles p2p operation.
 *
 * @hide
 */
public class WifiStateMachine extends StateMachine {

    private static final String NETWORKTYPE = "WIFI";
    private static final boolean DBG = false;

    private WifiMonitor mWifiMonitor;
    private WifiNative mWifiNative;
    private WifiConfigStore mWifiConfigStore;
    private INetworkManagementService mNwService;
    private ConnectivityManager mCm;

    private final boolean mP2pSupported;
    private final AtomicBoolean mP2pConnected = new AtomicBoolean(false);
    private boolean mTemporarilyDisconnectWifi = false;
    private final String mPrimaryDeviceType;

    /* Scan results handling */
    private List<ScanResult> mScanResults = new ArrayList<ScanResult>();
    private static final Pattern scanResultPattern = Pattern.compile("\t+");
    private static final int SCAN_RESULT_CACHE_SIZE = 80;
    private final LruCache<String, ScanResult> mScanResultCache;

    /* Batch scan results */
    private final List<BatchedScanResult> mBatchedScanResults =
            new ArrayList<BatchedScanResult>();
    private int mBatchedScanOwnerUid = UNKNOWN_SCAN_SOURCE;
    private int mExpectedBatchedScans = 0;
    private long mBatchedScanMinPollTime = 0;

    /* Chipset supports background scan */
    private final boolean mBackgroundScanSupported;

    private String mInterfaceName;
    /* Tethering interface could be separate from wlan interface */
    private String mTetherInterfaceName;

    private int mLastSignalLevel = -1;
    private String mLastBssid;
    private int mLastNetworkId;
    private boolean mEnableRssiPolling = false;
    private boolean mEnableBackgroundScan = false;
    private int mRssiPollToken = 0;
    private int mReconnectCount = 0;
    /* 3 operational states for STA operation: CONNECT_MODE, SCAN_ONLY_MODE, SCAN_ONLY_WIFI_OFF_MODE
    * In CONNECT_MODE, the STA can scan and connect to an access point
    * In SCAN_ONLY_MODE, the STA can only scan for access points
    * In SCAN_ONLY_WIFI_OFF_MODE, the STA can only scan for access points with wifi toggle being off
    */
    private int mOperationalMode = CONNECT_MODE;
    private boolean mScanResultIsPending = false;
    private WorkSource mScanWorkSource = null;
    private static final int UNKNOWN_SCAN_SOURCE = -1;
    /* Tracks if state machine has received any screen state change broadcast yet.
     * We can miss one of these at boot.
     */
    private AtomicBoolean mScreenBroadcastReceived = new AtomicBoolean(false);

    private boolean mBluetoothConnectionActive = false;

    private PowerManager.WakeLock mSuspendWakeLock;

    /**
     * Interval in milliseconds between polling for RSSI
     * and linkspeed information
     */
    private static final int POLL_RSSI_INTERVAL_MSECS = 3000;

    /**
     * Delay between supplicant restarts upon failure to establish connection
     */
    private static final int SUPPLICANT_RESTART_INTERVAL_MSECS = 5000;

    /**
     * Number of times we attempt to restart supplicant
     */
    private static final int SUPPLICANT_RESTART_TRIES = 5;

    private int mSupplicantRestartCount = 0;
    /* Tracks sequence number on stop failure message */
    private int mSupplicantStopFailureToken = 0;

    /**
     * Tether state change notification time out
     */
    private static final int TETHER_NOTIFICATION_TIME_OUT_MSECS = 5000;

    /* Tracks sequence number on a tether notification time out */
    private int mTetherToken = 0;

    /**
     * Driver start time out.
     */
    private static final int DRIVER_START_TIME_OUT_MSECS = 10000;

    /* Tracks sequence number on a driver time out */
    private int mDriverStartToken = 0;

    /**
     * The link properties of the wifi interface.
     * Do not modify this directly; use updateLinkProperties instead.
     */
    private LinkProperties mLinkProperties;

    /**
     * Subset of link properties coming from netlink.
     * Currently includes IPv4 and IPv6 addresses. In the future will also include IPv6 DNS servers
     * and domains obtained from router advertisements (RFC 6106).
     */
    private final LinkProperties mNetlinkLinkProperties;

    /* Tracks sequence number on a periodic scan message */
    private int mPeriodicScanToken = 0;

    // Wakelock held during wifi start/stop and driver load/unload
    private PowerManager.WakeLock mWakeLock;

    private Context mContext;

    private final Object mDhcpResultsLock = new Object();
    private DhcpResults mDhcpResults;
    private WifiInfo mWifiInfo;
    private NetworkInfo mNetworkInfo;
    private SupplicantStateTracker mSupplicantStateTracker;
    private DhcpStateMachine mDhcpStateMachine;
    private boolean mDhcpActive = false;

    private class InterfaceObserver extends BaseNetworkObserver {
        private WifiStateMachine mWifiStateMachine;

        InterfaceObserver(WifiStateMachine wifiStateMachine) {
            super();
            mWifiStateMachine = wifiStateMachine;
        }

        @Override
        public void addressUpdated(String address, String iface, int flags, int scope) {
            if (mWifiStateMachine.mInterfaceName.equals(iface)) {
                if (DBG) {
                    log("addressUpdated: " + address + " on " + iface +
                        " flags " + flags + " scope " + scope);
                }
                mWifiStateMachine.sendMessage(CMD_IP_ADDRESS_UPDATED, new LinkAddress(address));
            }
        }

        @Override
        public void addressRemoved(String address, String iface, int flags, int scope) {
            if (mWifiStateMachine.mInterfaceName.equals(iface)) {
                if (DBG) {
                    log("addressRemoved: " + address + " on " + iface +
                        " flags " + flags + " scope " + scope);
                }
                mWifiStateMachine.sendMessage(CMD_IP_ADDRESS_REMOVED, new LinkAddress(address));
            }
        }
    }

    private InterfaceObserver mInterfaceObserver;

    private AlarmManager mAlarmManager;
    private PendingIntent mScanIntent;
    private PendingIntent mDriverStopIntent;
    private PendingIntent mBatchedScanIntervalIntent;

    /* Tracks current frequency mode */
    private AtomicInteger mFrequencyBand = new AtomicInteger(WifiManager.WIFI_FREQUENCY_BAND_AUTO);

    /* Tracks if we are filtering Multicast v4 packets. Default is to filter. */
    private AtomicBoolean mFilteringMulticastV4Packets = new AtomicBoolean(true);

    // Channel for sending replies.
    private AsyncChannel mReplyChannel = new AsyncChannel();

    private WifiP2pManager mWifiP2pManager;
    //Used to initiate a connection with WifiP2pService
    private AsyncChannel mWifiP2pChannel;
    private AsyncChannel mWifiApConfigChannel;

    /* The base for wifi message types */
    static final int BASE = Protocol.BASE_WIFI;
    /* Start the supplicant */
    static final int CMD_START_SUPPLICANT                 = BASE + 11;
    /* Stop the supplicant */
    static final int CMD_STOP_SUPPLICANT                  = BASE + 12;
    /* Start the driver */
    static final int CMD_START_DRIVER                     = BASE + 13;
    /* Stop the driver */
    static final int CMD_STOP_DRIVER                      = BASE + 14;
    /* Indicates Static IP succeeded */
    static final int CMD_STATIC_IP_SUCCESS                = BASE + 15;
    /* Indicates Static IP failed */
    static final int CMD_STATIC_IP_FAILURE                = BASE + 16;
    /* Indicates supplicant stop failed */
    static final int CMD_STOP_SUPPLICANT_FAILED           = BASE + 17;
    /* Delayed stop to avoid shutting down driver too quick*/
    static final int CMD_DELAYED_STOP_DRIVER              = BASE + 18;
    /* A delayed message sent to start driver when it fail to come up */
    static final int CMD_DRIVER_START_TIMED_OUT           = BASE + 19;
    /* Ready to switch to network as default */
    static final int CMD_CAPTIVE_CHECK_COMPLETE           = BASE + 20;

    /* Start the soft access point */
    static final int CMD_START_AP                         = BASE + 21;
    /* Indicates soft ap start succeeded */
    static final int CMD_START_AP_SUCCESS                 = BASE + 22;
    /* Indicates soft ap start failed */
    static final int CMD_START_AP_FAILURE                 = BASE + 23;
    /* Stop the soft access point */
    static final int CMD_STOP_AP                          = BASE + 24;
    /* Set the soft access point configuration */
    static final int CMD_SET_AP_CONFIG                    = BASE + 25;
    /* Soft access point configuration set completed */
    static final int CMD_SET_AP_CONFIG_COMPLETED          = BASE + 26;
    /* Request the soft access point configuration */
    static final int CMD_REQUEST_AP_CONFIG                = BASE + 27;
    /* Response to access point configuration request */
    static final int CMD_RESPONSE_AP_CONFIG               = BASE + 28;
    /* Invoked when getting a tether state change notification */
    static final int CMD_TETHER_STATE_CHANGE              = BASE + 29;
    /* A delayed message sent to indicate tether state change failed to arrive */
    static final int CMD_TETHER_NOTIFICATION_TIMED_OUT    = BASE + 30;

    static final int CMD_BLUETOOTH_ADAPTER_STATE_CHANGE   = BASE + 31;

    /* Supplicant commands */
    /* Is supplicant alive ? */
    static final int CMD_PING_SUPPLICANT                  = BASE + 51;
    /* Add/update a network configuration */
    static final int CMD_ADD_OR_UPDATE_NETWORK            = BASE + 52;
    /* Delete a network */
    static final int CMD_REMOVE_NETWORK                   = BASE + 53;
    /* Enable a network. The device will attempt a connection to the given network. */
    static final int CMD_ENABLE_NETWORK                   = BASE + 54;
    /* Enable all networks */
    static final int CMD_ENABLE_ALL_NETWORKS              = BASE + 55;
    /* Blacklist network. De-prioritizes the given BSSID for connection. */
    static final int CMD_BLACKLIST_NETWORK                = BASE + 56;
    /* Clear the blacklist network list */
    static final int CMD_CLEAR_BLACKLIST                  = BASE + 57;
    /* Save configuration */
    static final int CMD_SAVE_CONFIG                      = BASE + 58;
    /* Get configured networks*/
    static final int CMD_GET_CONFIGURED_NETWORKS          = BASE + 59;

    /* Supplicant commands after driver start*/
    /* Initiate a scan */
    static final int CMD_START_SCAN                       = BASE + 71;
    /* Set operational mode. CONNECT, SCAN ONLY, SCAN_ONLY with Wi-Fi off mode */
    static final int CMD_SET_OPERATIONAL_MODE             = BASE + 72;
    /* Disconnect from a network */
    static final int CMD_DISCONNECT                       = BASE + 73;
    /* Reconnect to a network */
    static final int CMD_RECONNECT                        = BASE + 74;
    /* Reassociate to a network */
    static final int CMD_REASSOCIATE                      = BASE + 75;
    /* Controls suspend mode optimizations
     *
     * When high perf mode is enabled, suspend mode optimizations are disabled
     *
     * When high perf mode is disabled, suspend mode optimizations are enabled
     *
     * Suspend mode optimizations include:
     * - packet filtering
     * - turn off roaming
     * - DTIM wake up settings
     */
    static final int CMD_SET_HIGH_PERF_MODE               = BASE + 77;
    /* Set the country code */
    static final int CMD_SET_COUNTRY_CODE                 = BASE + 80;
    /* Enables RSSI poll */
    static final int CMD_ENABLE_RSSI_POLL                 = BASE + 82;
    /* RSSI poll */
    static final int CMD_RSSI_POLL                        = BASE + 83;
    /* Set up packet filtering */
    static final int CMD_START_PACKET_FILTERING           = BASE + 84;
    /* Clear packet filter */
    static final int CMD_STOP_PACKET_FILTERING            = BASE + 85;
    /* Enable suspend mode optimizations in the driver */
    static final int CMD_SET_SUSPEND_OPT_ENABLED          = BASE + 86;
    /* When there are no saved networks, we do a periodic scan to notify user of
     * an open network */
    static final int CMD_NO_NETWORKS_PERIODIC_SCAN        = BASE + 88;

    /* arg1 values to CMD_STOP_PACKET_FILTERING and CMD_START_PACKET_FILTERING */
    static final int MULTICAST_V6  = 1;
    static final int MULTICAST_V4  = 0;

   /* Set the frequency band */
    static final int CMD_SET_FREQUENCY_BAND               = BASE + 90;
    /* Enable background scan for configured networks */
    static final int CMD_ENABLE_BACKGROUND_SCAN           = BASE + 91;
    /* Enable TDLS on a specific MAC address */
    static final int CMD_ENABLE_TDLS                      = BASE + 92;

    /* Commands from/to the SupplicantStateTracker */
    /* Reset the supplicant state tracker */
    static final int CMD_RESET_SUPPLICANT_STATE           = BASE + 111;

    /* P2p commands */
    /* We are ok with no response here since we wont do much with it anyway */
    public static final int CMD_ENABLE_P2P                = BASE + 131;
    /* In order to shut down supplicant cleanly, we wait till p2p has
     * been disabled */
    public static final int CMD_DISABLE_P2P_REQ           = BASE + 132;
    public static final int CMD_DISABLE_P2P_RSP           = BASE + 133;

    public static final int CMD_BOOT_COMPLETED            = BASE + 134;

    /* change the batch scan settings.
     * arg1 = responsible UID
     * obj = the new settings
     */
    public static final int CMD_SET_BATCHED_SCAN          = BASE + 135;
    public static final int CMD_START_NEXT_BATCHED_SCAN   = BASE + 136;
    public static final int CMD_POLL_BATCHED_SCAN         = BASE + 137;

    /* Link configuration (IP address, DNS, ...) changes */
    /* An new IP address was added to our interface, or an existing IP address was updated */
    static final int CMD_IP_ADDRESS_UPDATED               = BASE + 140;
    /* An IP address was removed from our interface */
    static final int CMD_IP_ADDRESS_REMOVED               = BASE + 141;
    /* Reload all networks and reconnect */
    static final int CMD_RELOAD_TLS_AND_RECONNECT         = BASE + 142;

    /* Wifi state machine modes of operation */
    /* CONNECT_MODE - connect to any 'known' AP when it becomes available */
    public static final int CONNECT_MODE                   = 1;
    /* SCAN_ONLY_MODE - don't connect to any APs; scan, but only while apps hold lock */
    public static final int SCAN_ONLY_MODE                 = 2;
    /* SCAN_ONLY_WITH_WIFI_OFF - scan, but don't connect to any APs */
    public static final int SCAN_ONLY_WITH_WIFI_OFF_MODE   = 3;

    private static final int SUCCESS = 1;
    private static final int FAILURE = -1;

    /**
     * The maximum number of times we will retry a connection to an access point
     * for which we have failed in acquiring an IP address from DHCP. A value of
     * N means that we will make N+1 connection attempts in all.
     * <p>
     * See {@link Settings.Secure#WIFI_MAX_DHCP_RETRY_COUNT}. This is the default
     * value if a Settings value is not present.
     */
    private static final int DEFAULT_MAX_DHCP_RETRIES = 9;

    /* Tracks if suspend optimizations need to be disabled by DHCP,
     * screen or due to high perf mode.
     * When any of them needs to disable it, we keep the suspend optimizations
     * disabled
     */
    private int mSuspendOptNeedsDisabled = 0;

    private static final int SUSPEND_DUE_TO_DHCP       = 1;
    private static final int SUSPEND_DUE_TO_HIGH_PERF  = 1<<1;
    private static final int SUSPEND_DUE_TO_SCREEN     = 1<<2;

    /* Tracks if user has enabled suspend optimizations through settings */
    private AtomicBoolean mUserWantsSuspendOpt = new AtomicBoolean(true);

    /**
     * Default framework scan interval in milliseconds. This is used in the scenario in which
     * wifi chipset does not support background scanning to set up a
     * periodic wake up scan so that the device can connect to a new access
     * point on the move. {@link Settings.Global#WIFI_FRAMEWORK_SCAN_INTERVAL_MS} can
     * override this.
     */
    private final int mDefaultFrameworkScanIntervalMs;

    /**
     * Supplicant scan interval in milliseconds.
     * Comes from {@link Settings.Global#WIFI_SUPPLICANT_SCAN_INTERVAL_MS} or
     * from the default config if the setting is not set
     */
    private long mSupplicantScanIntervalMs;

    /**
     * Minimum time interval between enabling all networks.
     * A device can end up repeatedly connecting to a bad network on screen on/off toggle
     * due to enabling every time. We add a threshold to avoid this.
     */
    private static final int MIN_INTERVAL_ENABLE_ALL_NETWORKS_MS = 10 * 60 * 1000; /* 10 minutes */
    private long mLastEnableAllNetworksTime;

    /**
     * Starting and shutting down driver too quick causes problems leading to driver
     * being in a bad state. Delay driver stop.
     */
    private final int mDriverStopDelayMs;
    private int mDelayedStopCounter;
    private boolean mInDelayedStop = false;

    // sometimes telephony gives us this data before boot is complete and we can't store it
    // until after, so the write is deferred
    private volatile String mPersistedCountryCode;

    private static final int MIN_RSSI = -200;
    private static final int MAX_RSSI = 256;

    /* Default parent state */
    private State mDefaultState = new DefaultState();
    /* Temporary initial state */
    private State mInitialState = new InitialState();
    /* Driver loaded, waiting for supplicant to start */
    private State mSupplicantStartingState = new SupplicantStartingState();
    /* Driver loaded and supplicant ready */
    private State mSupplicantStartedState = new SupplicantStartedState();
    /* Waiting for supplicant to stop and monitor to exit */
    private State mSupplicantStoppingState = new SupplicantStoppingState();
    /* Driver start issued, waiting for completed event */
    private State mDriverStartingState = new DriverStartingState();
    /* Driver started */
    private State mDriverStartedState = new DriverStartedState();
    /* Wait until p2p is disabled
     * This is a special state which is entered right after we exit out of DriverStartedState
     * before transitioning to another state.
     */
    private State mWaitForP2pDisableState = new WaitForP2pDisableState();
    /* Driver stopping */
    private State mDriverStoppingState = new DriverStoppingState();
    /* Driver stopped */
    private State mDriverStoppedState = new DriverStoppedState();
    /* Scan for networks, no connection will be established */
    private State mScanModeState = new ScanModeState();
    /* Connecting to an access point */
    private State mConnectModeState = new ConnectModeState();
    /* Connected at 802.11 (L2) level */
    private State mL2ConnectedState = new L2ConnectedState();
    /* fetching IP after connection to access point (assoc+auth complete) */
    private State mObtainingIpState = new ObtainingIpState();
    /* Waiting for link quality verification to be complete */
    private State mVerifyingLinkState = new VerifyingLinkState();
    /* Waiting for captive portal check to be complete */
    private State mCaptivePortalCheckState = new CaptivePortalCheckState();
    /* Connected with IP addr */
    private State mConnectedState = new ConnectedState();
    /* disconnect issued, waiting for network disconnect confirmation */
    private State mDisconnectingState = new DisconnectingState();
    /* Network is not connected, supplicant assoc+auth is not complete */
    private State mDisconnectedState = new DisconnectedState();
    /* Waiting for WPS to be completed*/
    private State mWpsRunningState = new WpsRunningState();

    /* Soft ap is starting up */
    private State mSoftApStartingState = new SoftApStartingState();
    /* Soft ap is running */
    private State mSoftApStartedState = new SoftApStartedState();
    /* Soft ap is running and we are waiting for tether notification */
    private State mTetheringState = new TetheringState();
    /* Soft ap is running and we are tethered through connectivity service */
    private State mTetheredState = new TetheredState();
    /* Waiting for untether confirmation before stopping soft Ap */
    private State mUntetheringState = new UntetheringState();

    private class TetherStateChange {
        ArrayList<String> available;
        ArrayList<String> active;
        TetherStateChange(ArrayList<String> av, ArrayList<String> ac) {
            available = av;
            active = ac;
        }
    }


    /**
     * One of  {@link WifiManager#WIFI_STATE_DISABLED},
     *         {@link WifiManager#WIFI_STATE_DISABLING},
     *         {@link WifiManager#WIFI_STATE_ENABLED},
     *         {@link WifiManager#WIFI_STATE_ENABLING},
     *         {@link WifiManager#WIFI_STATE_UNKNOWN}
     *
     */
    private final AtomicInteger mWifiState = new AtomicInteger(WIFI_STATE_DISABLED);

    /**
     * One of  {@link WifiManager#WIFI_AP_STATE_DISABLED},
     *         {@link WifiManager#WIFI_AP_STATE_DISABLING},
     *         {@link WifiManager#WIFI_AP_STATE_ENABLED},
     *         {@link WifiManager#WIFI_AP_STATE_ENABLING},
     *         {@link WifiManager#WIFI_AP_STATE_FAILED}
     *
     */
    private final AtomicInteger mWifiApState = new AtomicInteger(WIFI_AP_STATE_DISABLED);

    private static final int SCAN_REQUEST = 0;
    private static final String ACTION_START_SCAN =
        "com.android.server.WifiManager.action.START_SCAN";

    private static final String DELAYED_STOP_COUNTER = "DelayedStopCounter";
    private static final int DRIVER_STOP_REQUEST = 0;
    private static final String ACTION_DELAYED_DRIVER_STOP =
        "com.android.server.WifiManager.action.DELAYED_DRIVER_STOP";

    private static final String ACTION_REFRESH_BATCHED_SCAN =
            "com.android.server.WifiManager.action.REFRESH_BATCHED_SCAN";
    /**
     * Keep track of whether WIFI is running.
     */
    private boolean mIsRunning = false;

    /**
     * Keep track of whether we last told the battery stats we had started.
     */
    private boolean mReportedRunning = false;

    /**
     * Most recently set source of starting WIFI.
     */
    private final WorkSource mRunningWifiUids = new WorkSource();

    /**
     * The last reported UIDs that were responsible for starting WIFI.
     */
    private final WorkSource mLastRunningWifiUids = new WorkSource();

    private final IBatteryStats mBatteryStats;

    private BatchedScanSettings mBatchedScanSettings = null;


    public WifiStateMachine(Context context, String wlanInterface) {
        super("WifiStateMachine");
        mContext = context;
        mInterfaceName = wlanInterface;

        mNetworkInfo = new NetworkInfo(ConnectivityManager.TYPE_WIFI, 0, NETWORKTYPE, "");
        mBatteryStats = IBatteryStats.Stub.asInterface(ServiceManager.getService(
                BatteryStats.SERVICE_NAME));

        IBinder b = ServiceManager.getService(Context.NETWORKMANAGEMENT_SERVICE);
        mNwService = INetworkManagementService.Stub.asInterface(b);

        mP2pSupported = mContext.getPackageManager().hasSystemFeature(
                PackageManager.FEATURE_WIFI_DIRECT);

        mWifiNative = new WifiNative(mInterfaceName);
        mWifiConfigStore = new WifiConfigStore(context, mWifiNative);
        mWifiMonitor = new WifiMonitor(this, mWifiNative);
        mWifiInfo = new WifiInfo();
        mSupplicantStateTracker = new SupplicantStateTracker(context, this, mWifiConfigStore,
                getHandler());
        mLinkProperties = new LinkProperties();
        mNetlinkLinkProperties = new LinkProperties();

        mWifiP2pManager = (WifiP2pManager) mContext.getSystemService(Context.WIFI_P2P_SERVICE);

        mNetworkInfo.setIsAvailable(false);
        mLastBssid = null;
        mLastNetworkId = WifiConfiguration.INVALID_NETWORK_ID;
        mLastSignalLevel = -1;

        mInterfaceObserver = new InterfaceObserver(this);
        try {
            mNwService.registerObserver(mInterfaceObserver);
        } catch (RemoteException e) {
            loge("Couldn't register interface observer: " + e.toString());
        }

        mAlarmManager = (AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE);
        Intent scanIntent = new Intent(ACTION_START_SCAN, null);
        mScanIntent = PendingIntent.getBroadcast(mContext, SCAN_REQUEST, scanIntent, 0);

        Intent batchedIntent = new Intent(ACTION_REFRESH_BATCHED_SCAN, null);
        mBatchedScanIntervalIntent = PendingIntent.getBroadcast(mContext, 0, batchedIntent, 0);

        mDefaultFrameworkScanIntervalMs = mContext.getResources().getInteger(
                R.integer.config_wifi_framework_scan_interval);

        mDriverStopDelayMs = mContext.getResources().getInteger(
                R.integer.config_wifi_driver_stop_delay);

        mBackgroundScanSupported = mContext.getResources().getBoolean(
                R.bool.config_wifi_background_scan_support);

        mPrimaryDeviceType = mContext.getResources().getString(
                R.string.config_wifi_p2p_device_type);

        mUserWantsSuspendOpt.set(Settings.Global.getInt(mContext.getContentResolver(),
                    Settings.Global.WIFI_SUSPEND_OPTIMIZATIONS_ENABLED, 1) == 1);

        mContext.registerReceiver(
            new BroadcastReceiver() {
                @Override
                public void onReceive(Context context, Intent intent) {
                    ArrayList<String> available = intent.getStringArrayListExtra(
                            ConnectivityManager.EXTRA_AVAILABLE_TETHER);
                    ArrayList<String> active = intent.getStringArrayListExtra(
                            ConnectivityManager.EXTRA_ACTIVE_TETHER);
                    sendMessage(CMD_TETHER_STATE_CHANGE, new TetherStateChange(available, active));
                }
            },new IntentFilter(ConnectivityManager.ACTION_TETHER_STATE_CHANGED));

        mContext.registerReceiver(
                new BroadcastReceiver() {
                    @Override
                    public void onReceive(Context context, Intent intent) {
                        final WorkSource workSource = null;
                        startScan(UNKNOWN_SCAN_SOURCE, workSource);
                    }
                },
                new IntentFilter(ACTION_START_SCAN));

        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(ACTION_REFRESH_BATCHED_SCAN);
        mContext.registerReceiver(
                new BroadcastReceiver() {
                    @Override
                    public void onReceive(Context context, Intent intent) {
                        String action = intent.getAction();

                        if (action.equals(Intent.ACTION_SCREEN_ON)) {
                            handleScreenStateChanged(true);
                        } else if (action.equals(Intent.ACTION_SCREEN_OFF)) {
                            handleScreenStateChanged(false);
                        } else if (action.equals(ACTION_REFRESH_BATCHED_SCAN)) {
                            startNextBatchedScanAsync();
                        }
                    }
                }, filter);

        mContext.registerReceiver(
                new BroadcastReceiver() {
                    @Override
                    public void onReceive(Context context, Intent intent) {
                       int counter = intent.getIntExtra(DELAYED_STOP_COUNTER, 0);
                       sendMessage(CMD_DELAYED_STOP_DRIVER, counter, 0);
                    }
                },
                new IntentFilter(ACTION_DELAYED_DRIVER_STOP));

        mContext.getContentResolver().registerContentObserver(Settings.Global.getUriFor(
                Settings.Global.WIFI_SUSPEND_OPTIMIZATIONS_ENABLED), false,
                new ContentObserver(getHandler()) {
                    @Override
                    public void onChange(boolean selfChange) {
                        mUserWantsSuspendOpt.set(Settings.Global.getInt(mContext.getContentResolver(),
                                Settings.Global.WIFI_SUSPEND_OPTIMIZATIONS_ENABLED, 1) == 1);
                    }
                });

        mContext.registerReceiver(
                new BroadcastReceiver() {
                    @Override
                    public void onReceive(Context context, Intent intent) {
                        sendMessage(CMD_BOOT_COMPLETED);
                    }
                },
                new IntentFilter(Intent.ACTION_BOOT_COMPLETED));

        mScanResultCache = new LruCache<String, ScanResult>(SCAN_RESULT_CACHE_SIZE);

        PowerManager powerManager = (PowerManager)mContext.getSystemService(Context.POWER_SERVICE);
        mWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, getName());

        mSuspendWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "WifiSuspend");
        mSuspendWakeLock.setReferenceCounted(false);

        addState(mDefaultState);
            addState(mInitialState, mDefaultState);
            addState(mSupplicantStartingState, mDefaultState);
            addState(mSupplicantStartedState, mDefaultState);
                addState(mDriverStartingState, mSupplicantStartedState);
                addState(mDriverStartedState, mSupplicantStartedState);
                    addState(mScanModeState, mDriverStartedState);
                    addState(mConnectModeState, mDriverStartedState);
                        addState(mL2ConnectedState, mConnectModeState);
                            addState(mObtainingIpState, mL2ConnectedState);
                            addState(mVerifyingLinkState, mL2ConnectedState);
                            addState(mCaptivePortalCheckState, mL2ConnectedState);
                            addState(mConnectedState, mL2ConnectedState);
                        addState(mDisconnectingState, mConnectModeState);
                        addState(mDisconnectedState, mConnectModeState);
                        addState(mWpsRunningState, mConnectModeState);
                addState(mWaitForP2pDisableState, mSupplicantStartedState);
                addState(mDriverStoppingState, mSupplicantStartedState);
                addState(mDriverStoppedState, mSupplicantStartedState);
            addState(mSupplicantStoppingState, mDefaultState);
            addState(mSoftApStartingState, mDefaultState);
            addState(mSoftApStartedState, mDefaultState);
                addState(mTetheringState, mSoftApStartedState);
                addState(mTetheredState, mSoftApStartedState);
                addState(mUntetheringState, mSoftApStartedState);

        setInitialState(mInitialState);

        setLogRecSize(2000);
        setLogOnlyTransitions(false);
        if (DBG) setDbg(true);

        //start the state machine
        start();

        final Intent intent = new Intent(WifiManager.WIFI_SCAN_AVAILABLE);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
        intent.putExtra(WifiManager.EXTRA_SCAN_AVAILABLE, WIFI_STATE_DISABLED);
        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    }

    /*********************************************************
     * Methods exposed for public use
     ********************************************************/

    public Messenger getMessenger() {
        return new Messenger(getHandler());
    }
    /**
     * TODO: doc
     */
    public boolean syncPingSupplicant(AsyncChannel channel) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_PING_SUPPLICANT);
        boolean result = (resultMsg.arg1 != FAILURE);
        resultMsg.recycle();
        return result;
    }

    /**
     * Initiate a wifi scan.  If workSource is not null, blame is given to it,
     * otherwise blame is given to callingUid.
     *
     * @param callingUid The uid initiating the wifi scan.  Blame will be given
     *                   here unless workSource is specified.
     * @param workSource If not null, blame is given to workSource.
     */
    public void startScan(int callingUid, WorkSource workSource) {
        sendMessage(CMD_START_SCAN, callingUid, 0, workSource);
    }

    /**
     * start or stop batched scanning using the given settings
     */
    public void setBatchedScanSettings(BatchedScanSettings settings, int callingUid) {
        sendMessage(CMD_SET_BATCHED_SCAN, callingUid, 0, settings);
    }

    public List<BatchedScanResult> syncGetBatchedScanResultsList() {
        synchronized (mBatchedScanResults) {
            List<BatchedScanResult> batchedScanList =
                    new ArrayList<BatchedScanResult>(mBatchedScanResults.size());
            for(BatchedScanResult result: mBatchedScanResults) {
                batchedScanList.add(new BatchedScanResult(result));
            }
            return batchedScanList;
        }
    }

    public void requestBatchedScanPoll() {
        sendMessage(CMD_POLL_BATCHED_SCAN);
    }

    private void startBatchedScan() {
        if (mDhcpActive) {
            if (DBG) log("not starting Batched Scans due to DHCP");
            return;
        }

        // first grab any existing data
        retrieveBatchedScanData();

        mAlarmManager.cancel(mBatchedScanIntervalIntent);

        String scansExpected = mWifiNative.setBatchedScanSettings(mBatchedScanSettings);

        try {
            mExpectedBatchedScans = Integer.parseInt(scansExpected);
            setNextBatchedAlarm(mExpectedBatchedScans);
        } catch (NumberFormatException e) {
            stopBatchedScan();
            loge("Exception parsing WifiNative.setBatchedScanSettings response " + e);
        }
    }

    // called from BroadcastListener
    private void startNextBatchedScanAsync() {
        sendMessage(CMD_START_NEXT_BATCHED_SCAN);
    }

    private void startNextBatchedScan() {
        // first grab any existing data
        retrieveBatchedScanData();

        setNextBatchedAlarm(mExpectedBatchedScans);
    }

    private void handleBatchedScanPollRequest() {
        if (DBG) {
            log("handleBatchedScanPoll Request - mBatchedScanMinPollTime=" +
                    mBatchedScanMinPollTime + " , mBatchedScanSettings=" +
                    mBatchedScanSettings);
        }
        // if there is no appropriate PollTime that's because we either aren't
        // batching or we've already set a time for a poll request
        if (mBatchedScanMinPollTime == 0) return;
        if (mBatchedScanSettings == null) return;

        long now = System.currentTimeMillis();

        if (now > mBatchedScanMinPollTime) {
            // do the poll and reset our timers
            startNextBatchedScan();
        } else {
            mAlarmManager.setExact(AlarmManager.RTC_WAKEUP, mBatchedScanMinPollTime,
                    mBatchedScanIntervalIntent);
            mBatchedScanMinPollTime = 0;
        }
    }

    // return true if new/different
    private boolean recordBatchedScanSettings(BatchedScanSettings settings) {
        if (DBG) log("set batched scan to " + settings);
        if (settings != null) {
            // TODO - noteBatchedScanStart(message.arg1);
            if (settings.equals(mBatchedScanSettings)) return false;
        } else {
            if (mBatchedScanSettings == null) return false;
            // TODO - noteBatchedScanStop(message.arg1);
        }
        mBatchedScanSettings = settings;
        return true;
    }

    private void stopBatchedScan() {
        mAlarmManager.cancel(mBatchedScanIntervalIntent);
        if (mBatchedScanSettings != null) {
            retrieveBatchedScanData();
            mWifiNative.setBatchedScanSettings(null);
        }
    }

    private void setNextBatchedAlarm(int scansExpected) {

        if (mBatchedScanSettings == null || scansExpected < 1) return;

        mBatchedScanMinPollTime = System.currentTimeMillis() +
                mBatchedScanSettings.scanIntervalSec * 1000;

        if (mBatchedScanSettings.maxScansPerBatch < scansExpected) {
            scansExpected = mBatchedScanSettings.maxScansPerBatch;
        }

        int secToFull = mBatchedScanSettings.scanIntervalSec;
        secToFull *= scansExpected;

        int debugPeriod = SystemProperties.getInt("wifi.batchedScan.pollPeriod", 0);
        if (debugPeriod > 0) secToFull = debugPeriod;

        // set the alarm to do the next poll.  We set it a little short as we'd rather
        // wake up wearly than miss a scan due to buffer overflow
        mAlarmManager.setExact(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
                + ((secToFull - (mBatchedScanSettings.scanIntervalSec / 2)) * 1000),
                mBatchedScanIntervalIntent);
    }

    /**
     * Start reading new scan data
     * Data comes in as:
     * "scancount=5\n"
     * "nextcount=5\n"
     *   "apcount=3\n"
     *   "trunc\n" (optional)
     *     "bssid=...\n"
     *     "ssid=...\n"
     *     "freq=...\n" (in Mhz)
     *     "level=...\n"
     *     "dist=...\n" (in cm)
     *     "distsd=...\n" (standard deviation, in cm)
     *     "===="
     *     "bssid=...\n"
     *     etc
     *     "===="
     *     "bssid=...\n"
     *     etc
     *     "%%%%"
     *   "apcount=2\n"
     *     "bssid=...\n"
     *     etc
     *     "%%%%
     *   etc
     *   "----"
     */
    private final static boolean DEBUG_PARSE = false;
    private void retrieveBatchedScanData() {
        String rawData = mWifiNative.getBatchedScanResults();
        if (DEBUG_PARSE) log("rawData = " + rawData);
        mBatchedScanMinPollTime = 0;
        if (rawData == null || rawData.equalsIgnoreCase("OK")) {
            loge("Unexpected BatchedScanResults :" + rawData);
            return;
        }

        int scanCount = 0;
        final String END_OF_BATCHES = "----";
        final String SCANCOUNT = "scancount=";
        final String TRUNCATED = "trunc";
        final String AGE = "age=";
        final String DIST = "dist=";
        final String DISTSD = "distSd=";

        String splitData[] = rawData.split("\n");
        int n = 0;
        if (splitData[n].startsWith(SCANCOUNT)) {
            try {
                scanCount = Integer.parseInt(splitData[n++].substring(SCANCOUNT.length()));
            } catch (NumberFormatException e) {
                loge("scancount parseInt Exception from " + splitData[n]);
            }
        } else log("scancount not found");
        if (scanCount == 0) {
            loge("scanCount==0 - aborting");
            return;
        }

        final Intent intent = new Intent(WifiManager.BATCHED_SCAN_RESULTS_AVAILABLE_ACTION);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);

        synchronized (mBatchedScanResults) {
            mBatchedScanResults.clear();
            BatchedScanResult batchedScanResult = new BatchedScanResult();

            String bssid = null;
            WifiSsid wifiSsid = null;
            int level = 0;
            int freq = 0;
            int dist, distSd;
            long tsf = 0;
            dist = distSd = ScanResult.UNSPECIFIED;
            final long now = SystemClock.elapsedRealtime();
            final int bssidStrLen = BSSID_STR.length();

            while (true) {
                while (n < splitData.length) {
                    if (DEBUG_PARSE) logd("parsing " + splitData[n]);
                    if (splitData[n].equals(END_OF_BATCHES)) {
                        if (n+1 != splitData.length) {
                            loge("didn't consume " + (splitData.length-n));
                        }
                        if (mBatchedScanResults.size() > 0) {
                            mContext.sendBroadcastAsUser(intent, UserHandle.ALL);
                        }
                        logd("retrieveBatchedScanResults X");
                        return;
                    }
                    if ((splitData[n].equals(END_STR)) || splitData[n].equals(DELIMITER_STR)) {
                        if (bssid != null) {
                            batchedScanResult.scanResults.add(new ScanResult(
                                    wifiSsid, bssid, "", level, freq, tsf, dist, distSd));
                            wifiSsid = null;
                            bssid = null;
                            level = 0;
                            freq = 0;
                            tsf = 0;
                            dist = distSd = ScanResult.UNSPECIFIED;
                        }
                        if (splitData[n].equals(END_STR)) {
                            if (batchedScanResult.scanResults.size() != 0) {
                                mBatchedScanResults.add(batchedScanResult);
                                batchedScanResult = new BatchedScanResult();
                            } else {
                                logd("Found empty batch");
                            }
                        }
                    } else if (splitData[n].equals(TRUNCATED)) {
                        batchedScanResult.truncated = true;
                    } else if (splitData[n].startsWith(BSSID_STR)) {
                        bssid = new String(splitData[n].getBytes(), bssidStrLen,
                                splitData[n].length() - bssidStrLen);
                    } else if (splitData[n].startsWith(FREQ_STR)) {
                        try {
                            freq = Integer.parseInt(splitData[n].substring(FREQ_STR.length()));
                        } catch (NumberFormatException e) {
                            loge("Invalid freqency: " + splitData[n]);
                            freq = 0;
                        }
                    } else if (splitData[n].startsWith(AGE)) {
                        try {
                            tsf = now - Long.parseLong(splitData[n].substring(AGE.length()));
                            tsf *= 1000; // convert mS -> uS
                        } catch (NumberFormatException e) {
                            loge("Invalid timestamp: " + splitData[n]);
                            tsf = 0;
                        }
                    } else if (splitData[n].startsWith(SSID_STR)) {
                        wifiSsid = WifiSsid.createFromAsciiEncoded(
                                splitData[n].substring(SSID_STR.length()));
                    } else if (splitData[n].startsWith(LEVEL_STR)) {
                        try {
                            level = Integer.parseInt(splitData[n].substring(LEVEL_STR.length()));
                            if (level > 0) level -= 256;
                        } catch (NumberFormatException e) {
                            loge("Invalid level: " + splitData[n]);
                            level = 0;
                        }
                    } else if (splitData[n].startsWith(DIST)) {
                        try {
                            dist = Integer.parseInt(splitData[n].substring(DIST.length()));
                        } catch (NumberFormatException e) {
                            loge("Invalid distance: " + splitData[n]);
                            dist = ScanResult.UNSPECIFIED;
                        }
                    } else if (splitData[n].startsWith(DISTSD)) {
                        try {
                            distSd = Integer.parseInt(splitData[n].substring(DISTSD.length()));
                        } catch (NumberFormatException e) {
                            loge("Invalid distanceSd: " + splitData[n]);
                            distSd = ScanResult.UNSPECIFIED;
                        }
                    } else {
                        loge("Unable to parse batched scan result line: " + splitData[n]);
                    }
                    n++;
                }
                rawData = mWifiNative.getBatchedScanResults();
                if (DEBUG_PARSE) log("reading more data:\n" + rawData);
                if (rawData == null) {
                    loge("Unexpected null BatchedScanResults");
                    return;
                }
                splitData = rawData.split("\n");
                if (splitData.length == 0 || splitData[0].equals("ok")) {
                    loge("batch scan results just ended!");
                    if (mBatchedScanResults.size() > 0) {
                        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
                    }
                    return;
                }
                n = 0;
            }
        }
    }

    // If workSource is not null, blame is given to it, otherwise blame is given to callingUid.
    private void noteScanStart(int callingUid, WorkSource workSource) {
        if (mScanWorkSource == null && (callingUid != UNKNOWN_SCAN_SOURCE || workSource != null)) {
            mScanWorkSource = workSource != null ? workSource : new WorkSource(callingUid);
            try {
                mBatteryStats.noteWifiScanStartedFromSource(mScanWorkSource);
            } catch (RemoteException e) {
                log(e.toString());
            }
        }
    }

    private void noteScanEnd() {
        if (mScanWorkSource != null) {
            try {
                mBatteryStats.noteWifiScanStoppedFromSource(mScanWorkSource);
            } catch (RemoteException e) {
                log(e.toString());
            } finally {
                mScanWorkSource = null;
            }
        }
    }

    private void startScanNative(int type) {
        mWifiNative.scan(type);
        mScanResultIsPending = true;
    }

    /**
     * TODO: doc
     */
    public void setSupplicantRunning(boolean enable) {
        if (enable) {
            sendMessage(CMD_START_SUPPLICANT);
        } else {
            sendMessage(CMD_STOP_SUPPLICANT);
        }
    }

    /**
     * TODO: doc
     */
    public void setHostApRunning(WifiConfiguration wifiConfig, boolean enable) {
        if (enable) {
            sendMessage(CMD_START_AP, wifiConfig);
        } else {
            sendMessage(CMD_STOP_AP);
        }
    }

    public void setWifiApConfiguration(WifiConfiguration config) {
        mWifiApConfigChannel.sendMessage(CMD_SET_AP_CONFIG, config);
    }

    public WifiConfiguration syncGetWifiApConfiguration() {
        Message resultMsg = mWifiApConfigChannel.sendMessageSynchronously(CMD_REQUEST_AP_CONFIG);
        WifiConfiguration ret = (WifiConfiguration) resultMsg.obj;
        resultMsg.recycle();
        return ret;
    }

    /**
     * TODO: doc
     */
    public int syncGetWifiState() {
        return mWifiState.get();
    }

    /**
     * TODO: doc
     */
    public String syncGetWifiStateByName() {
        switch (mWifiState.get()) {
            case WIFI_STATE_DISABLING:
                return "disabling";
            case WIFI_STATE_DISABLED:
                return "disabled";
            case WIFI_STATE_ENABLING:
                return "enabling";
            case WIFI_STATE_ENABLED:
                return "enabled";
            case WIFI_STATE_UNKNOWN:
                return "unknown state";
            default:
                return "[invalid state]";
        }
    }

    /**
     * TODO: doc
     */
    public int syncGetWifiApState() {
        return mWifiApState.get();
    }

    /**
     * TODO: doc
     */
    public String syncGetWifiApStateByName() {
        switch (mWifiApState.get()) {
            case WIFI_AP_STATE_DISABLING:
                return "disabling";
            case WIFI_AP_STATE_DISABLED:
                return "disabled";
            case WIFI_AP_STATE_ENABLING:
                return "enabling";
            case WIFI_AP_STATE_ENABLED:
                return "enabled";
            case WIFI_AP_STATE_FAILED:
                return "failed";
            default:
                return "[invalid state]";
        }
    }

    /**
     * Get status information for the current connection, if any.
     * @return a {@link WifiInfo} object containing information about the current connection
     *
     */
    public WifiInfo syncRequestConnectionInfo() {
        return mWifiInfo;
    }

    public DhcpResults syncGetDhcpResults() {
        synchronized (mDhcpResultsLock) {
            return new DhcpResults(mDhcpResults);
        }
    }

    /**
     * TODO: doc
     */
    public void setDriverStart(boolean enable) {
        if (enable) {
            sendMessage(CMD_START_DRIVER);
        } else {
            sendMessage(CMD_STOP_DRIVER);
        }
    }

    public void captivePortalCheckComplete() {
        sendMessage(CMD_CAPTIVE_CHECK_COMPLETE);
    }

    /**
     * TODO: doc
     */
    public void setOperationalMode(int mode) {
        if (DBG) log("setting operational mode to " + String.valueOf(mode));
        sendMessage(CMD_SET_OPERATIONAL_MODE, mode, 0);
    }

    /**
     * TODO: doc
     */
    public List<ScanResult> syncGetScanResultsList() {
        synchronized (mScanResultCache) {
            List<ScanResult> scanList = new ArrayList<ScanResult>();
            for(ScanResult result: mScanResults) {
                scanList.add(new ScanResult(result));
            }
            return scanList;
        }
    }

    /**
     * Disconnect from Access Point
     */
    public void disconnectCommand() {
        sendMessage(CMD_DISCONNECT);
    }

    /**
     * Initiate a reconnection to AP
     */
    public void reconnectCommand() {
        sendMessage(CMD_RECONNECT);
    }

    /**
     * Initiate a re-association to AP
     */
    public void reassociateCommand() {
        sendMessage(CMD_REASSOCIATE);
    }

    /**
     * Reload networks and then reconnect; helps load correct data for TLS networks
     */

    public void reloadTlsNetworksAndReconnect() {
        sendMessage(CMD_RELOAD_TLS_AND_RECONNECT);
    }

    /**
     * Add a network synchronously
     *
     * @return network id of the new network
     */
    public int syncAddOrUpdateNetwork(AsyncChannel channel, WifiConfiguration config) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_ADD_OR_UPDATE_NETWORK, config);
        int result = resultMsg.arg1;
        resultMsg.recycle();
        return result;
    }

    public List<WifiConfiguration> syncGetConfiguredNetworks(AsyncChannel channel) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_GET_CONFIGURED_NETWORKS);
        List<WifiConfiguration> result = (List<WifiConfiguration>) resultMsg.obj;
        resultMsg.recycle();
        return result;
    }

    /**
     * Delete a network
     *
     * @param networkId id of the network to be removed
     */
    public boolean syncRemoveNetwork(AsyncChannel channel, int networkId) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_REMOVE_NETWORK, networkId);
        boolean result = (resultMsg.arg1 != FAILURE);
        resultMsg.recycle();
        return result;
    }

    /**
     * Enable a network
     *
     * @param netId network id of the network
     * @param disableOthers true, if all other networks have to be disabled
     * @return {@code true} if the operation succeeds, {@code false} otherwise
     */
    public boolean syncEnableNetwork(AsyncChannel channel, int netId, boolean disableOthers) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_ENABLE_NETWORK, netId,
                disableOthers ? 1 : 0);
        boolean result = (resultMsg.arg1 != FAILURE);
        resultMsg.recycle();
        return result;
    }

    /**
     * Disable a network
     *
     * @param netId network id of the network
     * @return {@code true} if the operation succeeds, {@code false} otherwise
     */
    public boolean syncDisableNetwork(AsyncChannel channel, int netId) {
        Message resultMsg = channel.sendMessageSynchronously(WifiManager.DISABLE_NETWORK, netId);
        boolean result = (resultMsg.arg1 != WifiManager.DISABLE_NETWORK_FAILED);
        resultMsg.recycle();
        return result;
    }

    /**
     * Blacklist a BSSID. This will avoid the AP if there are
     * alternate APs to connect
     *
     * @param bssid BSSID of the network
     */
    public void addToBlacklist(String bssid) {
        sendMessage(CMD_BLACKLIST_NETWORK, bssid);
    }

    /**
     * Clear the blacklist list
     *
     */
    public void clearBlacklist() {
        sendMessage(CMD_CLEAR_BLACKLIST);
    }

    public void enableRssiPolling(boolean enabled) {
       sendMessage(CMD_ENABLE_RSSI_POLL, enabled ? 1 : 0, 0);
    }

    public void enableBackgroundScanCommand(boolean enabled) {
       sendMessage(CMD_ENABLE_BACKGROUND_SCAN, enabled ? 1 : 0, 0);
    }

    public void enableAllNetworks() {
        sendMessage(CMD_ENABLE_ALL_NETWORKS);
    }

    /**
     * Start filtering Multicast v4 packets
     */
    public void startFilteringMulticastV4Packets() {
        mFilteringMulticastV4Packets.set(true);
        sendMessage(CMD_START_PACKET_FILTERING, MULTICAST_V4, 0);
    }

    /**
     * Stop filtering Multicast v4 packets
     */
    public void stopFilteringMulticastV4Packets() {
        mFilteringMulticastV4Packets.set(false);
        sendMessage(CMD_STOP_PACKET_FILTERING, MULTICAST_V4, 0);
    }

    /**
     * Start filtering Multicast v4 packets
     */
    public void startFilteringMulticastV6Packets() {
        sendMessage(CMD_START_PACKET_FILTERING, MULTICAST_V6, 0);
    }

    /**
     * Stop filtering Multicast v4 packets
     */
    public void stopFilteringMulticastV6Packets() {
        sendMessage(CMD_STOP_PACKET_FILTERING, MULTICAST_V6, 0);
    }

    /**
     * Set high performance mode of operation.
     * Enabling would set active power mode and disable suspend optimizations;
     * disabling would set auto power mode and enable suspend optimizations
     * @param enable true if enable, false otherwise
     */
    public void setHighPerfModeEnabled(boolean enable) {
        sendMessage(CMD_SET_HIGH_PERF_MODE, enable ? 1 : 0, 0);
    }

    /**
     * Set the country code
     * @param countryCode following ISO 3166 format
     * @param persist {@code true} if the setting should be remembered.
     */
    public void setCountryCode(String countryCode, boolean persist) {
        if (persist) {
            mPersistedCountryCode = countryCode;
            Settings.Global.putString(mContext.getContentResolver(),
                    Settings.Global.WIFI_COUNTRY_CODE,
                    countryCode);
        }
        sendMessage(CMD_SET_COUNTRY_CODE, countryCode);
        mWifiP2pChannel.sendMessage(WifiP2pService.SET_COUNTRY_CODE, countryCode);
    }

    /**
     * Set the operational frequency band
     * @param band
     * @param persist {@code true} if the setting should be remembered.
     */
    public void setFrequencyBand(int band, boolean persist) {
        if (persist) {
            Settings.Global.putInt(mContext.getContentResolver(),
                    Settings.Global.WIFI_FREQUENCY_BAND,
                    band);
        }
        sendMessage(CMD_SET_FREQUENCY_BAND, band, 0);
    }

    /**
     * Enable TDLS for a specific MAC address
     */
    public void enableTdls(String remoteMacAddress, boolean enable) {
        int enabler = enable ? 1 : 0;
        sendMessage(CMD_ENABLE_TDLS, enabler, 0, remoteMacAddress);
    }

    /**
     * Returns the operational frequency band
     */
    public int getFrequencyBand() {
        return mFrequencyBand.get();
    }

    /**
     * Returns the wifi configuration file
     */
    public String getConfigFile() {
        return mWifiConfigStore.getConfigFile();
    }

    /**
     * Send a message indicating bluetooth adapter connection state changed
     */
    public void sendBluetoothAdapterStateChange(int state) {
        sendMessage(CMD_BLUETOOTH_ADAPTER_STATE_CHANGE, state, 0);
    }

    /**
     * Save configuration on supplicant
     *
     * @return {@code true} if the operation succeeds, {@code false} otherwise
     *
     * TODO: deprecate this
     */
    public boolean syncSaveConfig(AsyncChannel channel) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_SAVE_CONFIG);
        boolean result = (resultMsg.arg1 != FAILURE);
        resultMsg.recycle();
        return result;
    }

    public void updateBatteryWorkSource(WorkSource newSource) {
        synchronized (mRunningWifiUids) {
            try {
                if (newSource != null) {
                    mRunningWifiUids.set(newSource);
                }
                if (mIsRunning) {
                    if (mReportedRunning) {
                        // If the work source has changed since last time, need
                        // to remove old work from battery stats.
                        if (mLastRunningWifiUids.diff(mRunningWifiUids)) {
                            mBatteryStats.noteWifiRunningChanged(mLastRunningWifiUids,
                                    mRunningWifiUids);
                            mLastRunningWifiUids.set(mRunningWifiUids);
                        }
                    } else {
                        // Now being started, report it.
                        mBatteryStats.noteWifiRunning(mRunningWifiUids);
                        mLastRunningWifiUids.set(mRunningWifiUids);
                        mReportedRunning = true;
                    }
                } else {
                    if (mReportedRunning) {
                        // Last reported we were running, time to stop.
                        mBatteryStats.noteWifiStopped(mLastRunningWifiUids);
                        mLastRunningWifiUids.clear();
                        mReportedRunning = false;
                    }
                }
                mWakeLock.setWorkSource(newSource);
            } catch (RemoteException ignore) {
            }
        }
    }

    @Override
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        super.dump(fd, pw, args);
        mSupplicantStateTracker.dump(fd, pw, args);
        pw.println("mLinkProperties " + mLinkProperties);
        pw.println("mWifiInfo " + mWifiInfo);
        pw.println("mDhcpResults " + mDhcpResults);
        pw.println("mNetworkInfo " + mNetworkInfo);
        pw.println("mLastSignalLevel " + mLastSignalLevel);
        pw.println("mLastBssid " + mLastBssid);
        pw.println("mLastNetworkId " + mLastNetworkId);
        pw.println("mReconnectCount " + mReconnectCount);
        pw.println("mOperationalMode " + mOperationalMode);
        pw.println("mUserWantsSuspendOpt " + mUserWantsSuspendOpt);
        pw.println("mSuspendOptNeedsDisabled " + mSuspendOptNeedsDisabled);
        pw.println("Supplicant status " + mWifiNative.status());
        pw.println("mEnableBackgroundScan " + mEnableBackgroundScan);
        pw.println();
        mWifiConfigStore.dump(fd, pw, args);
    }

    /*********************************************************
     * Internal private functions
     ********************************************************/

    private void handleScreenStateChanged(boolean screenOn) {
        if (DBG) log("handleScreenStateChanged: " + screenOn);
        enableRssiPolling(screenOn);
        if (mBackgroundScanSupported) {
            enableBackgroundScanCommand(screenOn == false);
        }

        if (screenOn) enableAllNetworks();
        if (mUserWantsSuspendOpt.get()) {
            if (screenOn) {
                sendMessage(CMD_SET_SUSPEND_OPT_ENABLED, 0, 0);
            } else {
                //Allow 2s for suspend optimizations to be set
                mSuspendWakeLock.acquire(2000);
                sendMessage(CMD_SET_SUSPEND_OPT_ENABLED, 1, 0);
            }
        }
        mScreenBroadcastReceived.set(true);
    }

    private void checkAndSetConnectivityInstance() {
        if (mCm == null) {
            mCm = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
        }
    }

    private boolean startTethering(ArrayList<String> available) {

        boolean wifiAvailable = false;

        checkAndSetConnectivityInstance();

        String[] wifiRegexs = mCm.getTetherableWifiRegexs();

        for (String intf : available) {
            for (String regex : wifiRegexs) {
                if (intf.matches(regex)) {

                    InterfaceConfiguration ifcg = null;
                    try {
                        ifcg = mNwService.getInterfaceConfig(intf);
                        if (ifcg != null) {
                            /* IP/netmask: 192.168.43.1/255.255.255.0 */
                            ifcg.setLinkAddress(new LinkAddress(
                                    NetworkUtils.numericToInetAddress("192.168.43.1"), 24));
                            ifcg.setInterfaceUp();

                            mNwService.setInterfaceConfig(intf, ifcg);
                        }
                    } catch (Exception e) {
                        loge("Error configuring interface " + intf + ", :" + e);
                        return false;
                    }

                    if(mCm.tether(intf) != ConnectivityManager.TETHER_ERROR_NO_ERROR) {
                        loge("Error tethering on " + intf);
                        return false;
                    }
                    mTetherInterfaceName = intf;
                    return true;
                }
            }
        }
        // We found no interfaces to tether
        return false;
    }

    private void stopTethering() {

        checkAndSetConnectivityInstance();

        /* Clear the interface config to allow dhcp correctly configure new
           ip settings */
        InterfaceConfiguration ifcg = null;
        try {
            ifcg = mNwService.getInterfaceConfig(mTetherInterfaceName);
            if (ifcg != null) {
                ifcg.setLinkAddress(
                        new LinkAddress(NetworkUtils.numericToInetAddress("0.0.0.0"), 0));
                mNwService.setInterfaceConfig(mTetherInterfaceName, ifcg);
            }
        } catch (Exception e) {
            loge("Error resetting interface " + mTetherInterfaceName + ", :" + e);
        }

        if (mCm.untether(mTetherInterfaceName) != ConnectivityManager.TETHER_ERROR_NO_ERROR) {
            loge("Untether initiate failed!");
        }
    }

    private boolean isWifiTethered(ArrayList<String> active) {

        checkAndSetConnectivityInstance();

        String[] wifiRegexs = mCm.getTetherableWifiRegexs();
        for (String intf : active) {
            for (String regex : wifiRegexs) {
                if (intf.matches(regex)) {
                    return true;
                }
            }
        }
        // We found no interfaces that are tethered
        return false;
    }

    /**
     * Set the country code from the system setting value, if any.
     */
    private void setCountryCode() {
        String countryCode = Settings.Global.getString(mContext.getContentResolver(),
                Settings.Global.WIFI_COUNTRY_CODE);
        if (countryCode != null && !countryCode.isEmpty()) {
            setCountryCode(countryCode, false);
        } else {
            //use driver default
        }
    }

    /**
     * Set the frequency band from the system setting value, if any.
     */
    private void setFrequencyBand() {
        int band = Settings.Global.getInt(mContext.getContentResolver(),
                Settings.Global.WIFI_FREQUENCY_BAND, WifiManager.WIFI_FREQUENCY_BAND_AUTO);
        setFrequencyBand(band, false);
    }

    private void setSuspendOptimizationsNative(int reason, boolean enabled) {
        if (DBG) log("setSuspendOptimizationsNative: " + reason + " " + enabled);
        if (enabled) {
            mSuspendOptNeedsDisabled &= ~reason;
            /* None of dhcp, screen or highperf need it disabled and user wants it enabled */
            if (mSuspendOptNeedsDisabled == 0 && mUserWantsSuspendOpt.get()) {
                mWifiNative.setSuspendOptimizations(true);
            }
        } else {
            mSuspendOptNeedsDisabled |= reason;
            mWifiNative.setSuspendOptimizations(false);
        }
    }

    private void setSuspendOptimizations(int reason, boolean enabled) {
        if (DBG) log("setSuspendOptimizations: " + reason + " " + enabled);
        if (enabled) {
            mSuspendOptNeedsDisabled &= ~reason;
        } else {
            mSuspendOptNeedsDisabled |= reason;
        }
        if (DBG) log("mSuspendOptNeedsDisabled " + mSuspendOptNeedsDisabled);
    }

    private void setWifiState(int wifiState) {
        final int previousWifiState = mWifiState.get();

        try {
            if (wifiState == WIFI_STATE_ENABLED) {
                mBatteryStats.noteWifiOn();
            } else if (wifiState == WIFI_STATE_DISABLED) {
                mBatteryStats.noteWifiOff();
            }
        } catch (RemoteException e) {
            loge("Failed to note battery stats in wifi");
        }

        mWifiState.set(wifiState);

        if (DBG) log("setWifiState: " + syncGetWifiStateByName());

        final Intent intent = new Intent(WifiManager.WIFI_STATE_CHANGED_ACTION);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
        intent.putExtra(WifiManager.EXTRA_WIFI_STATE, wifiState);
        intent.putExtra(WifiManager.EXTRA_PREVIOUS_WIFI_STATE, previousWifiState);
        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    }

    private void setWifiApState(int wifiApState) {
        final int previousWifiApState = mWifiApState.get();

        try {
            if (wifiApState == WIFI_AP_STATE_ENABLED) {
                mBatteryStats.noteWifiOn();
            } else if (wifiApState == WIFI_AP_STATE_DISABLED) {
                mBatteryStats.noteWifiOff();
            }
        } catch (RemoteException e) {
            loge("Failed to note battery stats in wifi");
        }

        // Update state
        mWifiApState.set(wifiApState);

        if (DBG) log("setWifiApState: " + syncGetWifiApStateByName());

        final Intent intent = new Intent(WifiManager.WIFI_AP_STATE_CHANGED_ACTION);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
        intent.putExtra(WifiManager.EXTRA_WIFI_AP_STATE, wifiApState);
        intent.putExtra(WifiManager.EXTRA_PREVIOUS_WIFI_AP_STATE, previousWifiApState);
        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    }

    private static final String ID_STR = "id=";
    private static final String BSSID_STR = "bssid=";
    private static final String FREQ_STR = "freq=";
    private static final String LEVEL_STR = "level=";
    private static final String TSF_STR = "tsf=";
    private static final String FLAGS_STR = "flags=";
    private static final String SSID_STR = "ssid=";
    private static final String DELIMITER_STR = "====";
    private static final String END_STR = "####";

    /**
     * Format:
     *
     * id=1
     * bssid=68:7f:76:d7:1a:6e
     * freq=2412
     * level=-44
     * tsf=1344626243700342
     * flags=[WPA2-PSK-CCMP][WPS][ESS]
     * ssid=zfdy
     * ====
     * id=2
     * bssid=68:5f:74:d7:1a:6f
     * freq=5180
     * level=-73
     * tsf=1344626243700373
     * flags=[WPA2-PSK-CCMP][WPS][ESS]
     * ssid=zuby
     * ====
     */
    private void setScanResults() {
        String bssid = "";
        int level = 0;
        int freq = 0;
        long tsf = 0;
        String flags = "";
        WifiSsid wifiSsid = null;
        String scanResults;
        String tmpResults;
        StringBuffer scanResultsBuf = new StringBuffer();
        int sid = 0;

        while (true) {
            tmpResults = mWifiNative.scanResults(sid);
            if (TextUtils.isEmpty(tmpResults)) break;
            scanResultsBuf.append(tmpResults);
            scanResultsBuf.append("\n");
            String[] lines = tmpResults.split("\n");
            sid = -1;
            for (int i=lines.length - 1; i >= 0; i--) {
                if (lines[i].startsWith(END_STR)) {
                    break;
                } else if (lines[i].startsWith(ID_STR)) {
                    try {
                        sid = Integer.parseInt(lines[i].substring(ID_STR.length())) + 1;
                    } catch (NumberFormatException e) {
                        // Nothing to do
                    }
                    break;
                }
            }
            if (sid == -1) break;
        }

        scanResults = scanResultsBuf.toString();
        if (TextUtils.isEmpty(scanResults)) {
           return;
        }

        synchronized(mScanResultCache) {
            mScanResults = new ArrayList<ScanResult>();
            String[] lines = scanResults.split("\n");
            final int bssidStrLen = BSSID_STR.length();
            final int flagLen = FLAGS_STR.length();

            for (String line : lines) {
                if (line.startsWith(BSSID_STR)) {
                    bssid = new String(line.getBytes(), bssidStrLen, line.length() - bssidStrLen);
                } else if (line.startsWith(FREQ_STR)) {
                    try {
                        freq = Integer.parseInt(line.substring(FREQ_STR.length()));
                    } catch (NumberFormatException e) {
                        freq = 0;
                    }
                } else if (line.startsWith(LEVEL_STR)) {
                    try {
                        level = Integer.parseInt(line.substring(LEVEL_STR.length()));
                        /* some implementations avoid negative values by adding 256
                         * so we need to adjust for that here.
                         */
                        if (level > 0) level -= 256;
                    } catch(NumberFormatException e) {
                        level = 0;
                    }
                } else if (line.startsWith(TSF_STR)) {
                    try {
                        tsf = Long.parseLong(line.substring(TSF_STR.length()));
                    } catch (NumberFormatException e) {
                        tsf = 0;
                    }
                } else if (line.startsWith(FLAGS_STR)) {
                    flags = new String(line.getBytes(), flagLen, line.length() - flagLen);
                } else if (line.startsWith(SSID_STR)) {
                    wifiSsid = WifiSsid.createFromAsciiEncoded(
                            line.substring(SSID_STR.length()));
                } else if (line.startsWith(DELIMITER_STR) || line.startsWith(END_STR)) {
                    if (bssid != null) {
                        String ssid = (wifiSsid != null) ? wifiSsid.toString() : WifiSsid.NONE;
                        String key = bssid + ssid;
                        ScanResult scanResult = mScanResultCache.get(key);
                        if (scanResult != null) {
                            scanResult.level = level;
                            scanResult.wifiSsid = wifiSsid;
                            // Keep existing API
                            scanResult.SSID = (wifiSsid != null) ? wifiSsid.toString() :
                                    WifiSsid.NONE;
                            scanResult.capabilities = flags;
                            scanResult.frequency = freq;
                            scanResult.timestamp = tsf;
                        } else {
                            scanResult =
                                new ScanResult(
                                        wifiSsid, bssid, flags, level, freq, tsf);
                            mScanResultCache.put(key, scanResult);
                        }
                        mScanResults.add(scanResult);
                    }
                    bssid = null;
                    level = 0;
                    freq = 0;
                    tsf = 0;
                    flags = "";
                    wifiSsid = null;
                }
            }
        }
    }

    /*
     * Fetch RSSI and linkspeed on current connection
     */
    private void fetchRssiAndLinkSpeedNative() {
        int newRssi = -1;
        int newLinkSpeed = -1;

        String signalPoll = mWifiNative.signalPoll();

        if (signalPoll != null) {
            String[] lines = signalPoll.split("\n");
            for (String line : lines) {
                String[] prop = line.split("=");
                if (prop.length < 2) continue;
                try {
                    if (prop[0].equals("RSSI")) {
                        newRssi = Integer.parseInt(prop[1]);
                    } else if (prop[0].equals("LINKSPEED")) {
                        newLinkSpeed = Integer.parseInt(prop[1]);
                    }
                } catch (NumberFormatException e) {
                    //Ignore, defaults on rssi and linkspeed are assigned
                }
            }
        }

        if (newRssi != -1 && MIN_RSSI < newRssi && newRssi < MAX_RSSI) { // screen out invalid values
            /* some implementations avoid negative values by adding 256
             * so we need to adjust for that here.
             */
            if (newRssi > 0) newRssi -= 256;
            mWifiInfo.setRssi(newRssi);
            /*
             * Rather then sending the raw RSSI out every time it
             * changes, we precalculate the signal level that would
             * be displayed in the status bar, and only send the
             * broadcast if that much more coarse-grained number
             * changes. This cuts down greatly on the number of
             * broadcasts, at the cost of not informing others
             * interested in RSSI of all the changes in signal
             * level.
             */
            int newSignalLevel = WifiManager.calculateSignalLevel(newRssi, WifiManager.RSSI_LEVELS);
            if (newSignalLevel != mLastSignalLevel) {
                sendRssiChangeBroadcast(newRssi);
            }
            mLastSignalLevel = newSignalLevel;
        } else {
            mWifiInfo.setRssi(MIN_RSSI);
        }

        if (newLinkSpeed != -1) {
            mWifiInfo.setLinkSpeed(newLinkSpeed);
        }
    }

    /*
     * Fetch TX packet counters on current connection
     */
    private void fetchPktcntNative(RssiPacketCountInfo info) {
        String pktcntPoll = mWifiNative.pktcntPoll();

        if (pktcntPoll != null) {
            String[] lines = pktcntPoll.split("\n");
            for (String line : lines) {
                String[] prop = line.split("=");
                if (prop.length < 2) continue;
                try {
                    if (prop[0].equals("TXGOOD")) {
                        info.txgood = Integer.parseInt(prop[1]);
                    } else if (prop[0].equals("TXBAD")) {
                        info.txbad = Integer.parseInt(prop[1]);
                    }
                } catch (NumberFormatException e) {
                    //Ignore
                }
            }
        }
    }

    /**
     * Updates mLinkProperties by merging information from various sources.
     *
     * This is needed because the information in mLinkProperties comes from multiple sources (DHCP,
     * netlink, static configuration, ...). When one of these sources of information has updated
     * link properties, we can't just assign them to mLinkProperties or we'd lose track of the
     * information that came from other sources. Instead, when one of those sources has new
     * information, we update the object that tracks the information from that source and then
     * call this method to apply the change to mLinkProperties.
     *
     * The information in mLinkProperties is currently obtained as follows:
     * - Interface name: set in the constructor.
     * - IPv4 and IPv6 addresses: netlink, via mInterfaceObserver.
     * - IPv4 routes, DNS servers, and domains: DHCP.
     * - HTTP proxy: the wifi config store.
     */
    private void updateLinkProperties() {
        LinkProperties newLp = new LinkProperties();

        // Interface name and proxy are locally configured.
        newLp.setInterfaceName(mInterfaceName);
        newLp.setHttpProxy(mWifiConfigStore.getProxyProperties(mLastNetworkId));

        // IPv4 and IPv6 addresses come from netlink.
        newLp.setLinkAddresses(mNetlinkLinkProperties.getLinkAddresses());

        // For now, routing and DNS only come from DHCP or static configuration. In the future,
        // we'll need to merge IPv6 DNS servers and domains coming from netlink.
        synchronized (mDhcpResultsLock) {
            // Even when we're using static configuration, we don't need to look at the config
            // store, because static IP configuration also populates mDhcpResults.
            if ((mDhcpResults != null) && (mDhcpResults.linkProperties != null)) {
                LinkProperties lp = mDhcpResults.linkProperties;
                for (RouteInfo route: lp.getRoutes()) {
                    newLp.addRoute(route);
                }
                for (InetAddress dns: lp.getDnses()) {
                    newLp.addDns(dns);
                }
                newLp.setDomains(lp.getDomains());
            }
        }

        // If anything has changed, and we're already connected, send out a notification.
        // If we're still connecting, apps will be notified when we connect.
        if (!newLp.equals(mLinkProperties)) {
            if (DBG) {
                log("Link configuration changed for netId: " + mLastNetworkId
                        + " old: " + mLinkProperties + "new: " + newLp);
            }
            mLinkProperties = newLp;
            if (getNetworkDetailedState() == DetailedState.CONNECTED) {
                sendLinkConfigurationChangedBroadcast();
            }
        }
    }

    /**
     * Clears all our link properties.
     */
    private void clearLinkProperties() {
        // If the network used DHCP, clear the LinkProperties we stored in the config store.
        if (!mWifiConfigStore.isUsingStaticIp(mLastNetworkId)) {
            mWifiConfigStore.clearLinkProperties(mLastNetworkId);
        }

        // Clear the link properties obtained from DHCP and netlink.
        synchronized(mDhcpResultsLock) {
            if (mDhcpResults != null && mDhcpResults.linkProperties != null) {
                mDhcpResults.linkProperties.clear();
            }
        }
        mNetlinkLinkProperties.clear();

        // Now clear the merged link properties.
        mLinkProperties.clear();
    }

    private int getMaxDhcpRetries() {
        return Settings.Global.getInt(mContext.getContentResolver(),
                                      Settings.Global.WIFI_MAX_DHCP_RETRY_COUNT,
                                      DEFAULT_MAX_DHCP_RETRIES);
    }

    private void sendScanResultsAvailableBroadcast() {
        noteScanEnd();
        Intent intent = new Intent(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
        mContext.sendBroadcastAsUser(intent, UserHandle.ALL);
    }

    private void sendRssiChangeBroadcast(final int newRssi) {
        Intent intent = new Intent(WifiManager.RSSI_CHANGED_ACTION);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
        intent.putExtra(WifiManager.EXTRA_NEW_RSSI, newRssi);
        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    }

    private void sendNetworkStateChangeBroadcast(String bssid) {
        Intent intent = new Intent(WifiManager.NETWORK_STATE_CHANGED_ACTION);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
        intent.putExtra(WifiManager.EXTRA_NETWORK_INFO, new NetworkInfo(mNetworkInfo));
        intent.putExtra(WifiManager.EXTRA_LINK_PROPERTIES, new LinkProperties (mLinkProperties));
        if (bssid != null)
            intent.putExtra(WifiManager.EXTRA_BSSID, bssid);
        if (mNetworkInfo.getDetailedState() == DetailedState.VERIFYING_POOR_LINK ||
                mNetworkInfo.getDetailedState() == DetailedState.CONNECTED) {
            intent.putExtra(WifiManager.EXTRA_WIFI_INFO, new WifiInfo(mWifiInfo));
        }
        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    }

    private void sendLinkConfigurationChangedBroadcast() {
        Intent intent = new Intent(WifiManager.LINK_CONFIGURATION_CHANGED_ACTION);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
        intent.putExtra(WifiManager.EXTRA_LINK_PROPERTIES, new LinkProperties(mLinkProperties));
        mContext.sendBroadcastAsUser(intent, UserHandle.ALL);
    }

    private void sendSupplicantConnectionChangedBroadcast(boolean connected) {
        Intent intent = new Intent(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
        intent.putExtra(WifiManager.EXTRA_SUPPLICANT_CONNECTED, connected);
        mContext.sendBroadcastAsUser(intent, UserHandle.ALL);
    }

    /**
     * Record the detailed state of a network.
     * @param state the new {@code DetailedState}
     */
    private void setNetworkDetailedState(NetworkInfo.DetailedState state) {
        if (DBG) {
            log("setDetailed state, old ="
                    + mNetworkInfo.getDetailedState() + " and new state=" + state);
        }

        if (state != mNetworkInfo.getDetailedState()) {
            mNetworkInfo.setDetailedState(state, null, mWifiInfo.getSSID());
        }
    }

    private DetailedState getNetworkDetailedState() {
        return mNetworkInfo.getDetailedState();
    }


    private SupplicantState handleSupplicantStateChange(Message message) {
        StateChangeResult stateChangeResult = (StateChangeResult) message.obj;
        SupplicantState state = stateChangeResult.state;
        // Supplicant state change
        // [31-13] Reserved for future use
        // [8 - 0] Supplicant state (as defined in SupplicantState.java)
        // 50023 supplicant_state_changed (custom|1|5)
        mWifiInfo.setSupplicantState(state);
        // Network id is only valid when we start connecting
        if (SupplicantState.isConnecting(state)) {
            mWifiInfo.setNetworkId(stateChangeResult.networkId);
        } else {
            mWifiInfo.setNetworkId(WifiConfiguration.INVALID_NETWORK_ID);
        }

        mWifiInfo.setBSSID(stateChangeResult.BSSID);
        mWifiInfo.setSSID(stateChangeResult.wifiSsid);

        mSupplicantStateTracker.sendMessage(Message.obtain(message));

        return state;
    }

    /**
     * Resets the Wi-Fi Connections by clearing any state, resetting any sockets
     * using the interface, stopping DHCP & disabling interface
     */
    private void handleNetworkDisconnect() {
        if (DBG) log("Stopping DHCP and clearing IP");

        stopDhcp();

        try {
            mNwService.clearInterfaceAddresses(mInterfaceName);
            mNwService.disableIpv6(mInterfaceName);
        } catch (Exception e) {
            loge("Failed to clear addresses or disable ipv6" + e);
        }

        /* Reset data structures */
        mWifiInfo.setInetAddress(null);
        mWifiInfo.setBSSID(null);
        mWifiInfo.setSSID(null);
        mWifiInfo.setNetworkId(WifiConfiguration.INVALID_NETWORK_ID);
        mWifiInfo.setRssi(MIN_RSSI);
        mWifiInfo.setLinkSpeed(-1);
        mWifiInfo.setMeteredHint(false);

        setNetworkDetailedState(DetailedState.DISCONNECTED);
        mWifiConfigStore.updateStatus(mLastNetworkId, DetailedState.DISCONNECTED);

        /* Clear network properties */
        clearLinkProperties();

        /* send event to CM & network change broadcast */
        sendNetworkStateChangeBroadcast(mLastBssid);

        mLastBssid= null;
        mLastNetworkId = WifiConfiguration.INVALID_NETWORK_ID;
    }

    private void handleSupplicantConnectionLoss() {
        /* Socket connection can be lost when we do a graceful shutdown
        * or when the driver is hung. Ensure supplicant is stopped here.
        */
        mWifiMonitor.killSupplicant(mP2pSupported);
        sendSupplicantConnectionChangedBroadcast(false);
        setWifiState(WIFI_STATE_DISABLED);
    }

    void handlePreDhcpSetup() {
        mDhcpActive = true;
        if (!mBluetoothConnectionActive) {
            /*
             * There are problems setting the Wi-Fi driver's power
             * mode to active when bluetooth coexistence mode is
             * enabled or sense.
             * <p>
             * We set Wi-Fi to active mode when
             * obtaining an IP address because we've found
             * compatibility issues with some routers with low power
             * mode.
             * <p>
             * In order for this active power mode to properly be set,
             * we disable coexistence mode until we're done with
             * obtaining an IP address.  One exception is if we
             * are currently connected to a headset, since disabling
             * coexistence would interrupt that connection.
             */
            // Disable the coexistence mode
            mWifiNative.setBluetoothCoexistenceMode(
                    mWifiNative.BLUETOOTH_COEXISTENCE_MODE_DISABLED);
        }

        /* Disable power save and suspend optimizations during DHCP */
        // Note: The order here is important for now. Brcm driver changes
        // power settings when we control suspend mode optimizations.
        // TODO: Remove this comment when the driver is fixed.
        setSuspendOptimizationsNative(SUSPEND_DUE_TO_DHCP, false);
        mWifiNative.setPowerSave(false);

        stopBatchedScan();

        /* P2p discovery breaks dhcp, shut it down in order to get through this */
        Message msg = new Message();
        msg.what = WifiP2pService.BLOCK_DISCOVERY;
        msg.arg1 = WifiP2pService.ENABLED;
        msg.arg2 = DhcpStateMachine.CMD_PRE_DHCP_ACTION_COMPLETE;
        msg.obj = mDhcpStateMachine;
        mWifiP2pChannel.sendMessage(msg);
    }


    void startDhcp() {
        if (mDhcpStateMachine == null) {
            mDhcpStateMachine = DhcpStateMachine.makeDhcpStateMachine(
                    mContext, WifiStateMachine.this, mInterfaceName);

        }
        mDhcpStateMachine.registerForPreDhcpNotification();
        mDhcpStateMachine.sendMessage(DhcpStateMachine.CMD_START_DHCP);
    }

    void stopDhcp() {
        if (mDhcpStateMachine != null) {
            /* In case we were in middle of DHCP operation restore back powermode */
            handlePostDhcpSetup();
            mDhcpStateMachine.sendMessage(DhcpStateMachine.CMD_STOP_DHCP);
        }
    }

    void handlePostDhcpSetup() {
        /* Restore power save and suspend optimizations */
        setSuspendOptimizationsNative(SUSPEND_DUE_TO_DHCP, true);
        mWifiNative.setPowerSave(true);

        mWifiP2pChannel.sendMessage(WifiP2pService.BLOCK_DISCOVERY, WifiP2pService.DISABLED);

        // Set the coexistence mode back to its default value
        mWifiNative.setBluetoothCoexistenceMode(
                mWifiNative.BLUETOOTH_COEXISTENCE_MODE_SENSE);

        mDhcpActive = false;

        if (mBatchedScanSettings != null) {
            startBatchedScan();
        }
    }

    private void handleSuccessfulIpConfiguration(DhcpResults dhcpResults) {
        mLastSignalLevel = -1; // force update of signal strength
        mReconnectCount = 0; //Reset IP failure tracking
        synchronized (mDhcpResultsLock) {
            mDhcpResults = dhcpResults;
        }
        LinkProperties linkProperties = dhcpResults.linkProperties;
        mWifiConfigStore.setLinkProperties(mLastNetworkId, new LinkProperties(linkProperties));
        InetAddress addr = null;
        Iterator<InetAddress> addrs = linkProperties.getAddresses().iterator();
        if (addrs.hasNext()) {
            addr = addrs.next();
        }
        mWifiInfo.setInetAddress(addr);
        mWifiInfo.setMeteredHint(dhcpResults.hasMeteredHint());
        updateLinkProperties();
    }

    private void handleFailedIpConfiguration() {
        loge("IP configuration failed");

        mWifiInfo.setInetAddress(null);
        mWifiInfo.setMeteredHint(false);
        /**
         * If we've exceeded the maximum number of retries for DHCP
         * to a given network, disable the network
         */
        int maxRetries = getMaxDhcpRetries();
        // maxRetries == 0 means keep trying forever
        if (maxRetries > 0 && ++mReconnectCount > maxRetries) {
            loge("Failed " +
                    mReconnectCount + " times, Disabling " + mLastNetworkId);
            mWifiConfigStore.disableNetwork(mLastNetworkId,
                    WifiConfiguration.DISABLED_DHCP_FAILURE);
            mReconnectCount = 0;
        }

        /* DHCP times out after about 30 seconds, we do a
         * disconnect and an immediate reconnect to try again
         */
        mWifiNative.disconnect();
        mWifiNative.reconnect();
    }

    /* Current design is to not set the config on a running hostapd but instead
     * stop and start tethering when user changes config on a running access point
     *
     * TODO: Add control channel setup through hostapd that allows changing config
     * on a running daemon
     */
    private void startSoftApWithConfig(final WifiConfiguration config) {
        // start hostapd on a seperate thread
        new Thread(new Runnable() {
            public void run() {
                try {
                    mNwService.startAccessPoint(config, mInterfaceName);
                } catch (Exception e) {
                    loge("Exception in softap start " + e);
                    try {
                        mNwService.stopAccessPoint(mInterfaceName);
                        mNwService.startAccessPoint(config, mInterfaceName);
                    } catch (Exception e1) {
                        loge("Exception in softap re-start " + e1);
                        sendMessage(CMD_START_AP_FAILURE);
                        return;
                    }
                }
                if (DBG) log("Soft AP start successful");
                sendMessage(CMD_START_AP_SUCCESS);
            }
        }).start();
    }

    /********************************************************
     * HSM states
     *******************************************************/

    class DefaultState extends State {
        @Override
        public boolean processMessage(Message message) {
            switch (message.what) {
                case AsyncChannel.CMD_CHANNEL_HALF_CONNECTED:
                    if (message.arg1 == AsyncChannel.STATUS_SUCCESSFUL) {
                        mWifiP2pChannel.sendMessage(AsyncChannel.CMD_CHANNEL_FULL_CONNECTION);
                    } else {
                        loge("WifiP2pService connection failure, error=" + message.arg1);
                    }
                    break;
                case AsyncChannel.CMD_CHANNEL_DISCONNECTED:
                    loge("WifiP2pService channel lost, message.arg1 =" + message.arg1);
                    //TODO: Re-establish connection to state machine after a delay
                    //mWifiP2pChannel.connect(mContext, getHandler(), mWifiP2pManager.getMessenger());
                    break;
                case CMD_BLUETOOTH_ADAPTER_STATE_CHANGE:
                    mBluetoothConnectionActive = (message.arg1 !=
                            BluetoothAdapter.STATE_DISCONNECTED);
                    break;
                    /* Synchronous call returns */
                case CMD_PING_SUPPLICANT:
                case CMD_ENABLE_NETWORK:
                case CMD_ADD_OR_UPDATE_NETWORK:
                case CMD_REMOVE_NETWORK:
                case CMD_SAVE_CONFIG:
                    replyToMessage(message, message.what, FAILURE);
                    break;
                case CMD_GET_CONFIGURED_NETWORKS:
                    replyToMessage(message, message.what, (List<WifiConfiguration>) null);
                    break;
                case CMD_ENABLE_RSSI_POLL:
                    mEnableRssiPolling = (message.arg1 == 1);
                    break;
                case CMD_ENABLE_BACKGROUND_SCAN:
                    mEnableBackgroundScan = (message.arg1 == 1);
                    break;
                case CMD_SET_HIGH_PERF_MODE:
                    if (message.arg1 == 1) {
                        setSuspendOptimizations(SUSPEND_DUE_TO_HIGH_PERF, false);
                    } else {
                        setSuspendOptimizations(SUSPEND_DUE_TO_HIGH_PERF, true);
                    }
                    break;
                case CMD_BOOT_COMPLETED:
                    String countryCode = mPersistedCountryCode;
                    if (TextUtils.isEmpty(countryCode) == false) {
                        Settings.Global.putString(mContext.getContentResolver(),
                                Settings.Global.WIFI_COUNTRY_CODE,
                                countryCode);
                        // it may be that the state transition that should send this info
                        // to the driver happened between mPersistedCountryCode getting set
                        // and now, so simply persisting it here would mean we have sent
                        // nothing to the driver.  Send the cmd so it might be set now.
                        sendMessageAtFrontOfQueue(CMD_SET_COUNTRY_CODE, countryCode);
                    }
                    break;
                case CMD_SET_BATCHED_SCAN:
                    recordBatchedScanSettings((BatchedScanSettings)message.obj);
                    break;
                case CMD_POLL_BATCHED_SCAN:
                    handleBatchedScanPollRequest();
                    break;
                case CMD_START_NEXT_BATCHED_SCAN:
                    startNextBatchedScan();
                    break;
                    /* Discard */
                case CMD_START_SCAN:
                case CMD_START_SUPPLICANT:
                case CMD_STOP_SUPPLICANT:
                case CMD_STOP_SUPPLICANT_FAILED:
                case CMD_START_DRIVER:
                case CMD_STOP_DRIVER:
                case CMD_DELAYED_STOP_DRIVER:
                case CMD_DRIVER_START_TIMED_OUT:
                case CMD_CAPTIVE_CHECK_COMPLETE:
                case CMD_START_AP:
                case CMD_START_AP_SUCCESS:
                case CMD_START_AP_FAILURE:
                case CMD_STOP_AP:
                case CMD_TETHER_STATE_CHANGE:
                case CMD_TETHER_NOTIFICATION_TIMED_OUT:
                case CMD_DISCONNECT:
                case CMD_RECONNECT:
                case CMD_REASSOCIATE:
                case CMD_RELOAD_TLS_AND_RECONNECT:
                case WifiMonitor.SUP_CONNECTION_EVENT:
                case WifiMonitor.SUP_DISCONNECTION_EVENT:
                case WifiMonitor.NETWORK_CONNECTION_EVENT:
                case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                case WifiMonitor.SCAN_RESULTS_EVENT:
                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                case WifiMonitor.AUTHENTICATION_FAILURE_EVENT:
                case WifiMonitor.ASSOCIATION_REJECTION_EVENT:
                case WifiMonitor.WPS_OVERLAP_EVENT:
                case CMD_BLACKLIST_NETWORK:
                case CMD_CLEAR_BLACKLIST:
                case CMD_SET_OPERATIONAL_MODE:
                case CMD_SET_COUNTRY_CODE:
                case CMD_SET_FREQUENCY_BAND:
                case CMD_RSSI_POLL:
                case CMD_ENABLE_ALL_NETWORKS:
                case DhcpStateMachine.CMD_PRE_DHCP_ACTION:
                case DhcpStateMachine.CMD_POST_DHCP_ACTION:
                /* Handled by WifiApConfigStore */
                case CMD_SET_AP_CONFIG:
                case CMD_SET_AP_CONFIG_COMPLETED:
                case CMD_REQUEST_AP_CONFIG:
                case CMD_RESPONSE_AP_CONFIG:
                case WifiWatchdogStateMachine.POOR_LINK_DETECTED:
                case WifiWatchdogStateMachine.GOOD_LINK_DETECTED:
                case CMD_NO_NETWORKS_PERIODIC_SCAN:
                case CMD_DISABLE_P2P_RSP:
                    break;
                case DhcpStateMachine.CMD_ON_QUIT:
                    mDhcpStateMachine = null;
                    break;
                case CMD_SET_SUSPEND_OPT_ENABLED:
                    if (message.arg1 == 1) {
                        mSuspendWakeLock.release();
                        setSuspendOptimizations(SUSPEND_DUE_TO_SCREEN, true);
                    } else {
                        setSuspendOptimizations(SUSPEND_DUE_TO_SCREEN, false);
                    }
                    break;
                case WifiMonitor.DRIVER_HUNG_EVENT:
                    setSupplicantRunning(false);
                    setSupplicantRunning(true);
                    break;
                case WifiManager.CONNECT_NETWORK:
                    replyToMessage(message, WifiManager.CONNECT_NETWORK_FAILED,
                            WifiManager.BUSY);
                    break;
                case WifiManager.FORGET_NETWORK:
                    replyToMessage(message, WifiManager.FORGET_NETWORK_FAILED,
                            WifiManager.BUSY);
                    break;
                case WifiManager.SAVE_NETWORK:
                    replyToMessage(message, WifiManager.SAVE_NETWORK_FAILED,
                            WifiManager.BUSY);
                    break;
                case WifiManager.START_WPS:
                    replyToMessage(message, WifiManager.WPS_FAILED,
                            WifiManager.BUSY);
                    break;
                case WifiManager.CANCEL_WPS:
                    replyToMessage(message, WifiManager.CANCEL_WPS_FAILED,
                            WifiManager.BUSY);
                    break;
                case WifiManager.DISABLE_NETWORK:
                    replyToMessage(message, WifiManager.DISABLE_NETWORK_FAILED,
                            WifiManager.BUSY);
                    break;
                case WifiManager.RSSI_PKTCNT_FETCH:
                    replyToMessage(message, WifiManager.RSSI_PKTCNT_FETCH_FAILED,
                            WifiManager.BUSY);
                    break;
                case WifiP2pService.P2P_CONNECTION_CHANGED:
                    NetworkInfo info = (NetworkInfo) message.obj;
                    mP2pConnected.set(info.isConnected());
                    break;
                case WifiP2pService.DISCONNECT_WIFI_REQUEST:
                    mTemporarilyDisconnectWifi = (message.arg1 == 1);
                    replyToMessage(message, WifiP2pService.DISCONNECT_WIFI_RESPONSE);
                    break;
                case CMD_IP_ADDRESS_UPDATED:
                    // addLinkAddress is a no-op if called more than once with the same address.
                    if (mNetlinkLinkProperties.addLinkAddress((LinkAddress) message.obj)) {
                        updateLinkProperties();
                    }
                    break;
                case CMD_IP_ADDRESS_REMOVED:
                    if (mNetlinkLinkProperties.removeLinkAddress((LinkAddress) message.obj)) {
                        updateLinkProperties();
                    }
                    break;
                default:
                    loge("Error! unhandled message" + message);
                    break;
            }
            return HANDLED;
        }
    }

    class InitialState extends State {
        @Override
        public void enter() {
            mWifiNative.unloadDriver();

            if (mWifiP2pChannel == null) {
                mWifiP2pChannel = new AsyncChannel();
                mWifiP2pChannel.connect(mContext, getHandler(), mWifiP2pManager.getMessenger());
            }

            if (mWifiApConfigChannel == null) {
                mWifiApConfigChannel = new AsyncChannel();
                WifiApConfigStore wifiApConfigStore = WifiApConfigStore.makeWifiApConfigStore(
                        mContext, getHandler());
                wifiApConfigStore.loadApConfiguration();
                mWifiApConfigChannel.connectSync(mContext, getHandler(),
                        wifiApConfigStore.getMessenger());
            }
        }
        @Override
        public boolean processMessage(Message message) {
            switch (message.what) {
                case CMD_START_SUPPLICANT:
                    if (mWifiNative.loadDriver()) {
                        try {
                            mNwService.wifiFirmwareReload(mInterfaceName, "STA");
                        } catch (Exception e) {
                            loge("Failed to reload STA firmware " + e);
                            // continue
                        }

                        try {
                            // A runtime crash can leave the interface up and
                            // this affects connectivity when supplicant starts up.
                            // Ensure interface is down before a supplicant start.
                            mNwService.setInterfaceDown(mInterfaceName);
                            // Set privacy extensions
                            mNwService.setInterfaceIpv6PrivacyExtensions(mInterfaceName, true);

                           // IPv6 is enabled only as long as access point is connected since:
                           // - IPv6 addresses and routes stick around after disconnection
                           // - kernel is unaware when connected and fails to start IPv6 negotiation
                           // - kernel can start autoconfiguration when 802.1x is not complete
                            mNwService.disableIpv6(mInterfaceName);
                        } catch (RemoteException re) {
                            loge("Unable to change interface settings: " + re);
                        } catch (IllegalStateException ie) {
                            loge("Unable to change interface settings: " + ie);
                        }

                       /* Stop a running supplicant after a runtime restart
                        * Avoids issues with drivers that do not handle interface down
                        * on a running supplicant properly.
                        */
                        mWifiMonitor.killSupplicant(mP2pSupported);
                        if(mWifiNative.startSupplicant(mP2pSupported)) {
                            setWifiState(WIFI_STATE_ENABLING);
                            if (DBG) log("Supplicant start successful");
                            mWifiMonitor.startMonitoring();
                            transitionTo(mSupplicantStartingState);
                        } else {
                            loge("Failed to start supplicant!");
                        }
                    } else {
                        loge("Failed to load driver");
                    }
                    break;
                case CMD_START_AP:
                    if (mWifiNative.loadDriver()) {
                        setWifiApState(WIFI_AP_STATE_ENABLING);
                        transitionTo(mSoftApStartingState);
                    } else {
                        loge("Failed to load driver for softap");
                    }
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class SupplicantStartingState extends State {
        private void initializeWpsDetails() {
            String detail;
            detail = SystemProperties.get("ro.product.name", "");
            if (!mWifiNative.setDeviceName(detail)) {
                loge("Failed to set device name " +  detail);
            }
            detail = SystemProperties.get("ro.product.manufacturer", "");
            if (!mWifiNative.setManufacturer(detail)) {
                loge("Failed to set manufacturer " + detail);
            }
            detail = SystemProperties.get("ro.product.model", "");
            if (!mWifiNative.setModelName(detail)) {
                loge("Failed to set model name " + detail);
            }
            detail = SystemProperties.get("ro.product.model", "");
            if (!mWifiNative.setModelNumber(detail)) {
                loge("Failed to set model number " + detail);
            }
            detail = SystemProperties.get("ro.serialno", "");
            if (!mWifiNative.setSerialNumber(detail)) {
                loge("Failed to set serial number " + detail);
            }
            if (!mWifiNative.setConfigMethods("physical_display virtual_push_button")) {
                loge("Failed to set WPS config methods");
            }
            if (!mWifiNative.setDeviceType(mPrimaryDeviceType)) {
                loge("Failed to set primary device type " + mPrimaryDeviceType);
            }
        }

        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case WifiMonitor.SUP_CONNECTION_EVENT:
                    if (DBG) log("Supplicant connection established");
                    setWifiState(WIFI_STATE_ENABLED);
                    mSupplicantRestartCount = 0;
                    /* Reset the supplicant state to indicate the supplicant
                     * state is not known at this time */
                    mSupplicantStateTracker.sendMessage(CMD_RESET_SUPPLICANT_STATE);
                    /* Initialize data structures */
                    mLastBssid = null;
                    mLastNetworkId = WifiConfiguration.INVALID_NETWORK_ID;
                    mLastSignalLevel = -1;

                    mWifiInfo.setMacAddress(mWifiNative.getMacAddress());
                    mWifiConfigStore.loadAndEnableAllNetworks();
                    initializeWpsDetails();

                    sendSupplicantConnectionChangedBroadcast(true);
                    transitionTo(mDriverStartedState);
                    break;
                case WifiMonitor.SUP_DISCONNECTION_EVENT:
                    if (++mSupplicantRestartCount <= SUPPLICANT_RESTART_TRIES) {
                        loge("Failed to setup control channel, restart supplicant");
                        mWifiMonitor.killSupplicant(mP2pSupported);
                        transitionTo(mInitialState);
                        sendMessageDelayed(CMD_START_SUPPLICANT, SUPPLICANT_RESTART_INTERVAL_MSECS);
                    } else {
                        loge("Failed " + mSupplicantRestartCount +
                                " times to start supplicant, unload driver");
                        mSupplicantRestartCount = 0;
                        setWifiState(WIFI_STATE_UNKNOWN);
                        transitionTo(mInitialState);
                    }
                    break;
                case CMD_START_SUPPLICANT:
                case CMD_STOP_SUPPLICANT:
                case CMD_START_AP:
                case CMD_STOP_AP:
                case CMD_START_DRIVER:
                case CMD_STOP_DRIVER:
                case CMD_SET_OPERATIONAL_MODE:
                case CMD_SET_COUNTRY_CODE:
                case CMD_SET_FREQUENCY_BAND:
                case CMD_START_PACKET_FILTERING:
                case CMD_STOP_PACKET_FILTERING:
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class SupplicantStartedState extends State {
        @Override
        public void enter() {
            /* Wifi is available as long as we have a connection to supplicant */
            mNetworkInfo.setIsAvailable(true);

            int defaultInterval = mContext.getResources().getInteger(
                    R.integer.config_wifi_supplicant_scan_interval);

            mSupplicantScanIntervalMs = Settings.Global.getLong(mContext.getContentResolver(),
                    Settings.Global.WIFI_SUPPLICANT_SCAN_INTERVAL_MS,
                    defaultInterval);

            mWifiNative.setScanInterval((int)mSupplicantScanIntervalMs / 1000);
        }
        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case CMD_STOP_SUPPLICANT:   /* Supplicant stopped by user */
                    if (mP2pSupported) {
                        transitionTo(mWaitForP2pDisableState);
                    } else {
                        transitionTo(mSupplicantStoppingState);
                    }
                    break;
                case WifiMonitor.SUP_DISCONNECTION_EVENT:  /* Supplicant connection lost */
                    loge("Connection lost, restart supplicant");
                    handleSupplicantConnectionLoss();
                    handleNetworkDisconnect();
                    mSupplicantStateTracker.sendMessage(CMD_RESET_SUPPLICANT_STATE);
                    if (mP2pSupported) {
                        transitionTo(mWaitForP2pDisableState);
                    } else {
                        transitionTo(mInitialState);
                    }
                    sendMessageDelayed(CMD_START_SUPPLICANT, SUPPLICANT_RESTART_INTERVAL_MSECS);
                    break;
                case WifiMonitor.SCAN_RESULTS_EVENT:
                    setScanResults();
                    sendScanResultsAvailableBroadcast();
                    mScanResultIsPending = false;
                    break;
                case CMD_PING_SUPPLICANT:
                    boolean ok = mWifiNative.ping();
                    replyToMessage(message, message.what, ok ? SUCCESS : FAILURE);
                    break;
                    /* Cannot start soft AP while in client mode */
                case CMD_START_AP:
                    loge("Failed to start soft AP with a running supplicant");
                    setWifiApState(WIFI_AP_STATE_FAILED);
                    break;
                case CMD_SET_OPERATIONAL_MODE:
                    mOperationalMode = message.arg1;
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }

        @Override
        public void exit() {
            mNetworkInfo.setIsAvailable(false);
        }
    }

    class SupplicantStoppingState extends State {
        @Override
        public void enter() {
            /* Send any reset commands to supplicant before shutting it down */
            handleNetworkDisconnect();
            if (mDhcpStateMachine != null) {
                mDhcpStateMachine.doQuit();
            }

            if (DBG) log("stopping supplicant");
            mWifiMonitor.stopSupplicant();

            /* Send ourselves a delayed message to indicate failure after a wait time */
            sendMessageDelayed(obtainMessage(CMD_STOP_SUPPLICANT_FAILED,
                    ++mSupplicantStopFailureToken, 0), SUPPLICANT_RESTART_INTERVAL_MSECS);
            setWifiState(WIFI_STATE_DISABLING);
            mSupplicantStateTracker.sendMessage(CMD_RESET_SUPPLICANT_STATE);
        }
        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case WifiMonitor.SUP_CONNECTION_EVENT:
                    loge("Supplicant connection received while stopping");
                    break;
                case WifiMonitor.SUP_DISCONNECTION_EVENT:
                    if (DBG) log("Supplicant connection lost");
                    handleSupplicantConnectionLoss();
                    transitionTo(mInitialState);
                    break;
                case CMD_STOP_SUPPLICANT_FAILED:
                    if (message.arg1 == mSupplicantStopFailureToken) {
                        loge("Timed out on a supplicant stop, kill and proceed");
                        handleSupplicantConnectionLoss();
                        transitionTo(mInitialState);
                    }
                    break;
                case CMD_START_SUPPLICANT:
                case CMD_STOP_SUPPLICANT:
                case CMD_START_AP:
                case CMD_STOP_AP:
                case CMD_START_DRIVER:
                case CMD_STOP_DRIVER:
                case CMD_SET_OPERATIONAL_MODE:
                case CMD_SET_COUNTRY_CODE:
                case CMD_SET_FREQUENCY_BAND:
                case CMD_START_PACKET_FILTERING:
                case CMD_STOP_PACKET_FILTERING:
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class DriverStartingState extends State {
        private int mTries;
        @Override
        public void enter() {
            mTries = 1;
            /* Send ourselves a delayed message to start driver a second time */
            sendMessageDelayed(obtainMessage(CMD_DRIVER_START_TIMED_OUT,
                        ++mDriverStartToken, 0), DRIVER_START_TIME_OUT_MSECS);
        }
        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
               case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                    SupplicantState state = handleSupplicantStateChange(message);
                    /* If suplicant is exiting out of INTERFACE_DISABLED state into
                     * a state that indicates driver has started, it is ready to
                     * receive driver commands
                     */
                    if (SupplicantState.isDriverActive(state)) {
                        transitionTo(mDriverStartedState);
                    }
                    break;
                case CMD_DRIVER_START_TIMED_OUT:
                    if (message.arg1 == mDriverStartToken) {
                        if (mTries >= 2) {
                            loge("Failed to start driver after " + mTries);
                            transitionTo(mDriverStoppedState);
                        } else {
                            loge("Driver start failed, retrying");
                            mWakeLock.acquire();
                            mWifiNative.startDriver();
                            mWakeLock.release();

                            ++mTries;
                            /* Send ourselves a delayed message to start driver again */
                            sendMessageDelayed(obtainMessage(CMD_DRIVER_START_TIMED_OUT,
                                        ++mDriverStartToken, 0), DRIVER_START_TIME_OUT_MSECS);
                        }
                    }
                    break;
                    /* Queue driver commands & connection events */
                case CMD_START_DRIVER:
                case CMD_STOP_DRIVER:
                case WifiMonitor.NETWORK_CONNECTION_EVENT:
                case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                case WifiMonitor.AUTHENTICATION_FAILURE_EVENT:
                case WifiMonitor.ASSOCIATION_REJECTION_EVENT:
                case WifiMonitor.WPS_OVERLAP_EVENT:
                case CMD_SET_COUNTRY_CODE:
                case CMD_SET_FREQUENCY_BAND:
                case CMD_START_PACKET_FILTERING:
                case CMD_STOP_PACKET_FILTERING:
                case CMD_START_SCAN:
                case CMD_DISCONNECT:
                case CMD_REASSOCIATE:
                case CMD_RECONNECT:
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class DriverStartedState extends State {
        @Override
        public void enter() {
            mIsRunning = true;
            mInDelayedStop = false;
            mDelayedStopCounter++;
            updateBatteryWorkSource(null);
            /**
             * Enable bluetooth coexistence scan mode when bluetooth connection is active.
             * When this mode is on, some of the low-level scan parameters used by the
             * driver are changed to reduce interference with bluetooth
             */
            mWifiNative.setBluetoothCoexistenceScanMode(mBluetoothConnectionActive);
            /* set country code */
            setCountryCode();
            /* set frequency band of operation */
            setFrequencyBand();
            /* initialize network state */
            setNetworkDetailedState(DetailedState.DISCONNECTED);

            /* Remove any filtering on Multicast v6 at start */
            mWifiNative.stopFilteringMulticastV6Packets();

            /* Reset Multicast v4 filtering state */
            if (mFilteringMulticastV4Packets.get()) {
                mWifiNative.startFilteringMulticastV4Packets();
            } else {
                mWifiNative.stopFilteringMulticastV4Packets();
            }

            mDhcpActive = false;

            if (mBatchedScanSettings != null) {
                startBatchedScan();
            }

            if (mOperationalMode != CONNECT_MODE) {
                mWifiNative.disconnect();
                mWifiConfigStore.disableAllNetworks();
                if (mOperationalMode == SCAN_ONLY_WITH_WIFI_OFF_MODE) {
                    setWifiState(WIFI_STATE_DISABLED);
                }
                transitionTo(mScanModeState);
            } else {
                /* Driver stop may have disabled networks, enable right after start */
                mWifiConfigStore.enableAllNetworks();

                if (DBG) log("Attempting to reconnect to wifi network ..");
                mWifiNative.reconnect();

                // Status pulls in the current supplicant state and network connection state
                // events over the monitor connection. This helps framework sync up with
                // current supplicant state
                mWifiNative.status();
                transitionTo(mDisconnectedState);
            }

            // We may have missed screen update at boot
            if (mScreenBroadcastReceived.get() == false) {
                PowerManager powerManager = (PowerManager)mContext.getSystemService(
                        Context.POWER_SERVICE);
                handleScreenStateChanged(powerManager.isScreenOn());
            } else {
                // Set the right suspend mode settings
                mWifiNative.setSuspendOptimizations(mSuspendOptNeedsDisabled == 0
                        && mUserWantsSuspendOpt.get());
            }
            mWifiNative.setPowerSave(true);

            if (mP2pSupported) {
                if (mOperationalMode == CONNECT_MODE) {
                    mWifiP2pChannel.sendMessage(WifiStateMachine.CMD_ENABLE_P2P);
                } else {
                    // P2P statemachine starts in disabled state, and is not enabled until
                    // CMD_ENABLE_P2P is sent from here; so, nothing needs to be done to
                    // keep it disabled.
                }
            }

            final Intent intent = new Intent(WifiManager.WIFI_SCAN_AVAILABLE);
            intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
            intent.putExtra(WifiManager.EXTRA_SCAN_AVAILABLE, WIFI_STATE_ENABLED);
            mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
        }

        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case CMD_START_SCAN:
                    noteScanStart(message.arg1, (WorkSource) message.obj);
                    startScanNative(WifiNative.SCAN_WITH_CONNECTION_SETUP);
                    break;
                case CMD_SET_BATCHED_SCAN:
                    recordBatchedScanSettings((BatchedScanSettings)message.obj);
                    startBatchedScan();
                    break;
                case CMD_SET_COUNTRY_CODE:
                    String country = (String) message.obj;
                    if (DBG) log("set country code " + country);
                    if (!mWifiNative.setCountryCode(country)) {
                        loge("Failed to set country code " + country);
                    }
                    break;
                case CMD_SET_FREQUENCY_BAND:
                    int band =  message.arg1;
                    if (DBG) log("set frequency band " + band);
                    if (mWifiNative.setBand(band)) {
                        mFrequencyBand.set(band);
                        // flush old data - like scan results
                        mWifiNative.bssFlush();
                        //Fetch the latest scan results when frequency band is set
                        startScanNative(WifiNative.SCAN_WITH_CONNECTION_SETUP);
                    } else {
                        loge("Failed to set frequency band " + band);
                    }
                    break;
                case CMD_BLUETOOTH_ADAPTER_STATE_CHANGE:
                    mBluetoothConnectionActive = (message.arg1 !=
                            BluetoothAdapter.STATE_DISCONNECTED);
                    mWifiNative.setBluetoothCoexistenceScanMode(mBluetoothConnectionActive);
                    break;
                case CMD_STOP_DRIVER:
                    int mode = message.arg1;

                    /* Already doing a delayed stop */
                    if (mInDelayedStop) {
                        if (DBG) log("Already in delayed stop");
                        break;
                    }
                    /* disconnect right now, but leave the driver running for a bit */
                    mWifiConfigStore.disableAllNetworks();

                    mInDelayedStop = true;
                    mDelayedStopCounter++;
                    if (DBG) log("Delayed stop message " + mDelayedStopCounter);

                    /* send regular delayed shut down */
                    Intent driverStopIntent = new Intent(ACTION_DELAYED_DRIVER_STOP, null);
                    driverStopIntent.putExtra(DELAYED_STOP_COUNTER, mDelayedStopCounter);
                    mDriverStopIntent = PendingIntent.getBroadcast(mContext,
                            DRIVER_STOP_REQUEST, driverStopIntent,
                            PendingIntent.FLAG_UPDATE_CURRENT);

                    mAlarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()
                            + mDriverStopDelayMs, mDriverStopIntent);
                    break;
                case CMD_START_DRIVER:
                    if (mInDelayedStop) {
                        mInDelayedStop = false;
                        mDelayedStopCounter++;
                        mAlarmManager.cancel(mDriverStopIntent);
                        if (DBG) log("Delayed stop ignored due to start");
                        if (mOperationalMode == CONNECT_MODE) {
                            mWifiConfigStore.enableAllNetworks();
                        }
                    }
                    break;
                case CMD_DELAYED_STOP_DRIVER:
                    if (DBG) log("delayed stop " + message.arg1 + " " + mDelayedStopCounter);
                    if (message.arg1 != mDelayedStopCounter) break;
                    if (getCurrentState() != mDisconnectedState) {
                        mWifiNative.disconnect();
                        handleNetworkDisconnect();
                    }
                    mWakeLock.acquire();
                    mWifiNative.stopDriver();
                    mWakeLock.release();
                    if (mP2pSupported) {
                        transitionTo(mWaitForP2pDisableState);
                    } else {
                        transitionTo(mDriverStoppingState);
                    }
                    break;
                case CMD_START_PACKET_FILTERING:
                    if (message.arg1 == MULTICAST_V6) {
                        mWifiNative.startFilteringMulticastV6Packets();
                    } else if (message.arg1 == MULTICAST_V4) {
                        mWifiNative.startFilteringMulticastV4Packets();
                    } else {
                        loge("Illegal arugments to CMD_START_PACKET_FILTERING");
                    }
                    break;
                case CMD_STOP_PACKET_FILTERING:
                    if (message.arg1 == MULTICAST_V6) {
                        mWifiNative.stopFilteringMulticastV6Packets();
                    } else if (message.arg1 == MULTICAST_V4) {
                        mWifiNative.stopFilteringMulticastV4Packets();
                    } else {
                        loge("Illegal arugments to CMD_STOP_PACKET_FILTERING");
                    }
                    break;
                case CMD_SET_SUSPEND_OPT_ENABLED:
                    if (message.arg1 == 1) {
                        setSuspendOptimizationsNative(SUSPEND_DUE_TO_SCREEN, true);
                        mSuspendWakeLock.release();
                    } else {
                        setSuspendOptimizationsNative(SUSPEND_DUE_TO_SCREEN, false);
                    }
                    break;
                case CMD_SET_HIGH_PERF_MODE:
                    if (message.arg1 == 1) {
                        setSuspendOptimizationsNative(SUSPEND_DUE_TO_HIGH_PERF, false);
                    } else {
                        setSuspendOptimizationsNative(SUSPEND_DUE_TO_HIGH_PERF, true);
                    }
                    break;
                case CMD_ENABLE_TDLS:
                    if (message.obj != null) {
                        String remoteAddress = (String) message.obj;
                        boolean enable = (message.arg1 == 1);
                        mWifiNative.startTdls(remoteAddress, enable);
                    }
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
        @Override
        public void exit() {
            mIsRunning = false;
            updateBatteryWorkSource(null);
            mScanResults = new ArrayList<ScanResult>();

            if (mBatchedScanSettings != null) {
                stopBatchedScan();
            }

            final Intent intent = new Intent(WifiManager.WIFI_SCAN_AVAILABLE);
            intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
            intent.putExtra(WifiManager.EXTRA_SCAN_AVAILABLE, WIFI_STATE_DISABLED);
            mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
            noteScanEnd(); // wrap up any pending request.
        }
    }

    class WaitForP2pDisableState extends State {
        private State mTransitionToState;
        @Override
        public void enter() {
            switch (getCurrentMessage().what) {
                case WifiMonitor.SUP_DISCONNECTION_EVENT:
                    mTransitionToState = mInitialState;
                    break;
                case CMD_DELAYED_STOP_DRIVER:
                    mTransitionToState = mDriverStoppingState;
                    break;
                case CMD_STOP_SUPPLICANT:
                    mTransitionToState = mSupplicantStoppingState;
                    break;
                default:
                    mTransitionToState = mDriverStoppingState;
                    break;
            }
            mWifiP2pChannel.sendMessage(WifiStateMachine.CMD_DISABLE_P2P_REQ);
        }
        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case WifiStateMachine.CMD_DISABLE_P2P_RSP:
                    transitionTo(mTransitionToState);
                    break;
                /* Defer wifi start/shut and driver commands */
                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                case CMD_START_SUPPLICANT:
                case CMD_STOP_SUPPLICANT:
                case CMD_START_AP:
                case CMD_STOP_AP:
                case CMD_START_DRIVER:
                case CMD_STOP_DRIVER:
                case CMD_SET_OPERATIONAL_MODE:
                case CMD_SET_COUNTRY_CODE:
                case CMD_SET_FREQUENCY_BAND:
                case CMD_START_PACKET_FILTERING:
                case CMD_STOP_PACKET_FILTERING:
                case CMD_START_SCAN:
                case CMD_DISCONNECT:
                case CMD_REASSOCIATE:
                case CMD_RECONNECT:
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class DriverStoppingState extends State {
        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                    SupplicantState state = handleSupplicantStateChange(message);
                    if (state == SupplicantState.INTERFACE_DISABLED) {
                        transitionTo(mDriverStoppedState);
                    }
                    break;
                    /* Queue driver commands */
                case CMD_START_DRIVER:
                case CMD_STOP_DRIVER:
                case CMD_SET_COUNTRY_CODE:
                case CMD_SET_FREQUENCY_BAND:
                case CMD_START_PACKET_FILTERING:
                case CMD_STOP_PACKET_FILTERING:
                case CMD_START_SCAN:
                case CMD_DISCONNECT:
                case CMD_REASSOCIATE:
                case CMD_RECONNECT:
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class DriverStoppedState extends State {
        @Override
        public boolean processMessage(Message message) {
            switch (message.what) {
                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                    StateChangeResult stateChangeResult = (StateChangeResult) message.obj;
                    SupplicantState state = stateChangeResult.state;
                    // A WEXT bug means that we can be back to driver started state
                    // unexpectedly
                    if (SupplicantState.isDriverActive(state)) {
                        transitionTo(mDriverStartedState);
                    }
                    break;
                case CMD_START_DRIVER:
                    mWakeLock.acquire();
                    mWifiNative.startDriver();
                    mWakeLock.release();
                    transitionTo(mDriverStartingState);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class ScanModeState extends State {
        private int mLastOperationMode;
        @Override
        public void enter() {
            mLastOperationMode = mOperationalMode;
        }
        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case CMD_SET_OPERATIONAL_MODE:
                    if (message.arg1 == CONNECT_MODE) {

                        if (mLastOperationMode == SCAN_ONLY_WITH_WIFI_OFF_MODE) {
                            setWifiState(WIFI_STATE_ENABLED);
                            // Load and re-enable networks when going back to enabled state
                            // This is essential for networks to show up after restore
                            mWifiConfigStore.loadAndEnableAllNetworks();
                            mWifiP2pChannel.sendMessage(CMD_ENABLE_P2P);
                        } else {
                            mWifiConfigStore.enableAllNetworks();
                        }

                        mWifiNative.reconnect();

                        mOperationalMode = CONNECT_MODE;
                        transitionTo(mDisconnectedState);
                    } else {
                        // Nothing to do
                        return HANDLED;
                    }
                    break;
                // Handle scan. All the connection related commands are
                // handled only in ConnectModeState
                case CMD_START_SCAN:
                    noteScanStart(message.arg1, (WorkSource) message.obj);
                    startScanNative(WifiNative.SCAN_WITHOUT_CONNECTION_SETUP);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class ConnectModeState extends State {
        @Override
        public boolean processMessage(Message message) {
            WifiConfiguration config;
            boolean ok;
            switch(message.what) {
                case WifiMonitor.ASSOCIATION_REJECTION_EVENT:
                    mSupplicantStateTracker.sendMessage(WifiMonitor.ASSOCIATION_REJECTION_EVENT);
                    break;
                case WifiMonitor.AUTHENTICATION_FAILURE_EVENT:
                    mSupplicantStateTracker.sendMessage(WifiMonitor.AUTHENTICATION_FAILURE_EVENT);
                    break;
                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                    SupplicantState state = handleSupplicantStateChange(message);
                    // A driver/firmware hang can now put the interface in a down state.
                    // We detect the interface going down and recover from it
                    if (!SupplicantState.isDriverActive(state)) {
                        if (mNetworkInfo.getState() != NetworkInfo.State.DISCONNECTED) {
                            handleNetworkDisconnect();
                        }
                        log("Detected an interface down, restart driver");
                        transitionTo(mDriverStoppedState);
                        sendMessage(CMD_START_DRIVER);
                        break;
                    }

                    // Supplicant can fail to report a NETWORK_DISCONNECTION_EVENT
                    // when authentication times out after a successful connection,
                    // we can figure this from the supplicant state. If supplicant
                    // state is DISCONNECTED, but the mNetworkInfo says we are not
                    // disconnected, we need to handle a disconnection
                    if (state == SupplicantState.DISCONNECTED &&
                            mNetworkInfo.getState() != NetworkInfo.State.DISCONNECTED) {
                        if (DBG) log("Missed CTRL-EVENT-DISCONNECTED, disconnect");
                        handleNetworkDisconnect();
                        transitionTo(mDisconnectedState);
                    }
                    break;
                case WifiP2pService.DISCONNECT_WIFI_REQUEST:
                    if (message.arg1 == 1) {
                        mWifiNative.disconnect();
                        mTemporarilyDisconnectWifi = true;
                    } else {
                        mWifiNative.reconnect();
                        mTemporarilyDisconnectWifi = false;
                    }
                    break;
                case CMD_ADD_OR_UPDATE_NETWORK:
                    config = (WifiConfiguration) message.obj;
                    replyToMessage(message, CMD_ADD_OR_UPDATE_NETWORK,
                            mWifiConfigStore.addOrUpdateNetwork(config));
                    break;
                case CMD_REMOVE_NETWORK:
                    ok = mWifiConfigStore.removeNetwork(message.arg1);
                    replyToMessage(message, message.what, ok ? SUCCESS : FAILURE);
                    break;
                case CMD_ENABLE_NETWORK:
                    ok = mWifiConfigStore.enableNetwork(message.arg1, message.arg2 == 1);
                    replyToMessage(message, message.what, ok ? SUCCESS : FAILURE);
                    break;
                case CMD_ENABLE_ALL_NETWORKS:
                    long time =  android.os.SystemClock.elapsedRealtime();
                    if (time - mLastEnableAllNetworksTime > MIN_INTERVAL_ENABLE_ALL_NETWORKS_MS) {
                        mWifiConfigStore.enableAllNetworks();
                        mLastEnableAllNetworksTime = time;
                    }
                    break;
                case WifiManager.DISABLE_NETWORK:
                    if (mWifiConfigStore.disableNetwork(message.arg1,
                            WifiConfiguration.DISABLED_UNKNOWN_REASON) == true) {
                        replyToMessage(message, WifiManager.DISABLE_NETWORK_SUCCEEDED);
                    } else {
                        replyToMessage(message, WifiManager.DISABLE_NETWORK_FAILED,
                                WifiManager.ERROR);
                    }
                    break;
                case CMD_BLACKLIST_NETWORK:
                    mWifiNative.addToBlacklist((String)message.obj);
                    break;
                case CMD_CLEAR_BLACKLIST:
                    mWifiNative.clearBlacklist();
                    break;
                case CMD_SAVE_CONFIG:
                    ok = mWifiConfigStore.saveConfig();
                    replyToMessage(message, CMD_SAVE_CONFIG, ok ? SUCCESS : FAILURE);

                    // Inform the backup manager about a data change
                    IBackupManager ibm = IBackupManager.Stub.asInterface(
                            ServiceManager.getService(Context.BACKUP_SERVICE));
                    if (ibm != null) {
                        try {
                            ibm.dataChanged("com.android.providers.settings");
                        } catch (Exception e) {
                            // Try again later
                        }
                    }
                    break;
                case CMD_GET_CONFIGURED_NETWORKS:
                    replyToMessage(message, message.what,
                            mWifiConfigStore.getConfiguredNetworks());
                    break;
                    /* Do a redundant disconnect without transition */
                case CMD_DISCONNECT:
                    mWifiNative.disconnect();
                    break;
                case CMD_RECONNECT:
                    mWifiNative.reconnect();
                    break;
                case CMD_REASSOCIATE:
                    mWifiNative.reassociate();
                    break;
                case CMD_RELOAD_TLS_AND_RECONNECT:
                    if (mWifiConfigStore.needsUnlockedKeyStore()) {
                        logd("Reconnecting to give a chance to un-connected TLS networks");
                        mWifiNative.disconnect();
                        mWifiNative.reconnect();
                    }
                    break;
                case WifiManager.CONNECT_NETWORK:
                    /* The connect message can contain a network id passed as arg1 on message or
                     * or a config passed as obj on message.
                     * For a new network, a config is passed to create and connect.
                     * For an existing network, a network id is passed
                     */
                    int netId = message.arg1;
                    config = (WifiConfiguration) message.obj;

                    /* Save the network config */
                    if (config != null) {
                        NetworkUpdateResult result = mWifiConfigStore.saveNetwork(config);
                        netId = result.getNetworkId();
                    }

                    if (mWifiConfigStore.selectNetwork(netId) &&
                            mWifiNative.reconnect()) {
                        /* The state tracker handles enabling networks upon completion/failure */
                        mSupplicantStateTracker.sendMessage(WifiManager.CONNECT_NETWORK);
                        replyToMessage(message, WifiManager.CONNECT_NETWORK_SUCCEEDED);
                        /* Expect a disconnection from the old connection */
                        transitionTo(mDisconnectingState);
                    } else {
                        loge("Failed to connect config: " + config + " netId: " + netId);
                        replyToMessage(message, WifiManager.CONNECT_NETWORK_FAILED,
                                WifiManager.ERROR);
                        break;
                    }
                    break;
                case WifiManager.SAVE_NETWORK:
                    config = (WifiConfiguration) message.obj;
                    NetworkUpdateResult result = mWifiConfigStore.saveNetwork(config);
                    if (result.getNetworkId() != WifiConfiguration.INVALID_NETWORK_ID) {
                        replyToMessage(message, WifiManager.SAVE_NETWORK_SUCCEEDED);
                    } else {
                        loge("Failed to save network");
                        replyToMessage(message, WifiManager.SAVE_NETWORK_FAILED,
                                WifiManager.ERROR);
                    }
                    break;
                case WifiManager.FORGET_NETWORK:
                    if (mWifiConfigStore.forgetNetwork(message.arg1)) {
                        replyToMessage(message, WifiManager.FORGET_NETWORK_SUCCEEDED);
                    } else {
                        loge("Failed to forget network");
                        replyToMessage(message, WifiManager.FORGET_NETWORK_FAILED,
                                WifiManager.ERROR);
                    }
                    break;
                case WifiManager.START_WPS:
                    WpsInfo wpsInfo = (WpsInfo) message.obj;
                    WpsResult wpsResult;
                    switch (wpsInfo.setup) {
                        case WpsInfo.PBC:
                            wpsResult = mWifiConfigStore.startWpsPbc(wpsInfo);
                            break;
                        case WpsInfo.KEYPAD:
                            wpsResult = mWifiConfigStore.startWpsWithPinFromAccessPoint(wpsInfo);
                            break;
                        case WpsInfo.DISPLAY:
                            wpsResult = mWifiConfigStore.startWpsWithPinFromDevice(wpsInfo);
                            break;
                        default:
                            wpsResult = new WpsResult(Status.FAILURE);
                            loge("Invalid setup for WPS");
                            break;
                    }
                    if (wpsResult.status == Status.SUCCESS) {
                        replyToMessage(message, WifiManager.START_WPS_SUCCEEDED, wpsResult);
                        transitionTo(mWpsRunningState);
                    } else {
                        loge("Failed to start WPS with config " + wpsInfo.toString());
                        replyToMessage(message, WifiManager.WPS_FAILED, WifiManager.ERROR);
                    }
                    break;
                case WifiMonitor.NETWORK_CONNECTION_EVENT:
                    if (DBG) log("Network connection established");
                    mLastNetworkId = message.arg1;
                    mLastBssid = (String) message.obj;

                    mWifiInfo.setBSSID(mLastBssid);
                    mWifiInfo.setNetworkId(mLastNetworkId);
                    /* send event to CM & network change broadcast */
                    setNetworkDetailedState(DetailedState.OBTAINING_IPADDR);
                    sendNetworkStateChangeBroadcast(mLastBssid);
                    transitionTo(mObtainingIpState);
                    break;
                case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                    if (DBG) log("Network connection lost");
                    handleNetworkDisconnect();
                    transitionTo(mDisconnectedState);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class L2ConnectedState extends State {
        @Override
        public void enter() {
            mRssiPollToken++;
            if (mEnableRssiPolling) {
                sendMessage(CMD_RSSI_POLL, mRssiPollToken, 0);
            }
        }

        @Override
        public void exit() {
            handleNetworkDisconnect();
        }

        @Override
        public boolean processMessage(Message message) {
            switch (message.what) {
              case DhcpStateMachine.CMD_PRE_DHCP_ACTION:
                  handlePreDhcpSetup();
                  break;
              case DhcpStateMachine.CMD_POST_DHCP_ACTION:
                  handlePostDhcpSetup();
                  if (message.arg1 == DhcpStateMachine.DHCP_SUCCESS) {
                      if (DBG) log("DHCP successful");
                      handleSuccessfulIpConfiguration((DhcpResults) message.obj);
                      transitionTo(mVerifyingLinkState);
                  } else if (message.arg1 == DhcpStateMachine.DHCP_FAILURE) {
                      if (DBG) log("DHCP failed");
                      handleFailedIpConfiguration();
                      transitionTo(mDisconnectingState);
                  }
                  break;
                case CMD_DISCONNECT:
                    mWifiNative.disconnect();
                    transitionTo(mDisconnectingState);
                    break;
                case WifiP2pService.DISCONNECT_WIFI_REQUEST:
                    if (message.arg1 == 1) {
                        mWifiNative.disconnect();
                        mTemporarilyDisconnectWifi = true;
                        transitionTo(mDisconnectingState);
                    }
                    break;
                case CMD_SET_OPERATIONAL_MODE:
                    if (message.arg1 != CONNECT_MODE) {
                        sendMessage(CMD_DISCONNECT);
                        deferMessage(message);
                    }
                    break;
                case CMD_START_SCAN:
                    /* Do not attempt to connect when we are already connected */
                    noteScanStart(message.arg1, (WorkSource) message.obj);
                    startScanNative(WifiNative.SCAN_WITHOUT_CONNECTION_SETUP);
                    break;
                    /* Ignore connection to same network */
                case WifiManager.CONNECT_NETWORK:
                    int netId = message.arg1;
                    if (mWifiInfo.getNetworkId() == netId) {
                        break;
                    }
                    return NOT_HANDLED;
                case WifiManager.SAVE_NETWORK:
                    WifiConfiguration config = (WifiConfiguration) message.obj;
                    NetworkUpdateResult result = mWifiConfigStore.saveNetwork(config);
                    if (mWifiInfo.getNetworkId() == result.getNetworkId()) {
                        if (result.hasIpChanged()) {
                            log("Reconfiguring IP on connection");
                            transitionTo(mObtainingIpState);
                        }
                        if (result.hasProxyChanged()) {
                            log("Reconfiguring proxy on connection");
                            updateLinkProperties();
                        }
                    }

                    if (result.getNetworkId() != WifiConfiguration.INVALID_NETWORK_ID) {
                        replyToMessage(message, WifiManager.SAVE_NETWORK_SUCCEEDED);
                    } else {
                        loge("Failed to save network");
                        replyToMessage(message, WifiManager.SAVE_NETWORK_FAILED,
                                WifiManager.ERROR);
                    }
                    break;
                    /* Ignore */
                case WifiMonitor.NETWORK_CONNECTION_EVENT:
                    break;
                case CMD_RSSI_POLL:
                    if (message.arg1 == mRssiPollToken) {
                        // Get Info and continue polling
                        fetchRssiAndLinkSpeedNative();
                        sendMessageDelayed(obtainMessage(CMD_RSSI_POLL,
                                mRssiPollToken, 0), POLL_RSSI_INTERVAL_MSECS);
                    } else {
                        // Polling has completed
                    }
                    break;
                case CMD_ENABLE_RSSI_POLL:
                    mEnableRssiPolling = (message.arg1 == 1);
                    mRssiPollToken++;
                    if (mEnableRssiPolling) {
                        // first poll
                        fetchRssiAndLinkSpeedNative();
                        sendMessageDelayed(obtainMessage(CMD_RSSI_POLL,
                                mRssiPollToken, 0), POLL_RSSI_INTERVAL_MSECS);
                    }
                    break;
                case WifiManager.RSSI_PKTCNT_FETCH:
                    RssiPacketCountInfo info = new RssiPacketCountInfo();
                    fetchRssiAndLinkSpeedNative();
                    info.rssi = mWifiInfo.getRssi();
                    fetchPktcntNative(info);
                    replyToMessage(message, WifiManager.RSSI_PKTCNT_FETCH_SUCCEEDED, info);
                    break;
                default:
                    return NOT_HANDLED;
            }

            return HANDLED;
        }
    }

    class ObtainingIpState extends State {
        @Override
        public void enter() {
            if (!mWifiConfigStore.isUsingStaticIp(mLastNetworkId)) {
                // TODO: If we're switching between static IP configuration and DHCP, remove the
                // static configuration first.
                startDhcp();
            } else {
                // stop any running dhcp before assigning static IP
                stopDhcp();
                DhcpResults dhcpResults = new DhcpResults(
                        mWifiConfigStore.getLinkProperties(mLastNetworkId));
                InterfaceConfiguration ifcg = new InterfaceConfiguration();
                Iterator<LinkAddress> addrs =
                        dhcpResults.linkProperties.getLinkAddresses().iterator();
                if (!addrs.hasNext()) {
                    loge("Static IP lacks address");
                    sendMessage(CMD_STATIC_IP_FAILURE);
                } else {
                    ifcg.setLinkAddress(addrs.next());
                    ifcg.setInterfaceUp();
                    try {
                        mNwService.setInterfaceConfig(mInterfaceName, ifcg);
                        if (DBG) log("Static IP configuration succeeded");
                        sendMessage(CMD_STATIC_IP_SUCCESS, dhcpResults);
                    } catch (RemoteException re) {
                        loge("Static IP configuration failed: " + re);
                        sendMessage(CMD_STATIC_IP_FAILURE);
                    } catch (IllegalStateException e) {
                        loge("Static IP configuration failed: " + e);
                        sendMessage(CMD_STATIC_IP_FAILURE);
                    }
                }
            }
        }
      @Override
      public boolean processMessage(Message message) {
          if (DBG) log(getName() + message.toString() + "\n");
          switch(message.what) {
            case CMD_STATIC_IP_SUCCESS:
                  handleSuccessfulIpConfiguration((DhcpResults) message.obj);
                  transitionTo(mVerifyingLinkState);
                  break;
              case CMD_STATIC_IP_FAILURE:
                  handleFailedIpConfiguration();
                  transitionTo(mDisconnectingState);
                  break;
             case WifiManager.SAVE_NETWORK:
                  deferMessage(message);
                  break;
                  /* Defer any power mode changes since we must keep active power mode at DHCP */
              case CMD_SET_HIGH_PERF_MODE:
                  deferMessage(message);
                  break;
                  /* Defer scan request since we should not switch to other channels at DHCP */
              case CMD_START_SCAN:
                  deferMessage(message);
                  break;
              default:
                  return NOT_HANDLED;
          }
          return HANDLED;
      }
    }

    class VerifyingLinkState extends State {
        @Override
        public void enter() {
            log(getName() + " enter");
            setNetworkDetailedState(DetailedState.VERIFYING_POOR_LINK);
            mWifiConfigStore.updateStatus(mLastNetworkId, DetailedState.VERIFYING_POOR_LINK);
            sendNetworkStateChangeBroadcast(mLastBssid);
        }
        @Override
        public boolean processMessage(Message message) {
            switch (message.what) {
                case WifiWatchdogStateMachine.POOR_LINK_DETECTED:
                    //stay here
                    log(getName() + " POOR_LINK_DETECTED: no transition");
                    break;
                case WifiWatchdogStateMachine.GOOD_LINK_DETECTED:
                    log(getName() + " GOOD_LINK_DETECTED: transition to captive portal check");
                    transitionTo(mCaptivePortalCheckState);
                    break;
                default:
                    if (DBG) log(getName() + " what=" + message.what + " NOT_HANDLED");
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class CaptivePortalCheckState extends State {
        @Override
        public void enter() {
            log(getName() + " enter");
            setNetworkDetailedState(DetailedState.CAPTIVE_PORTAL_CHECK);
            mWifiConfigStore.updateStatus(mLastNetworkId, DetailedState.CAPTIVE_PORTAL_CHECK);
            sendNetworkStateChangeBroadcast(mLastBssid);
        }
        @Override
        public boolean processMessage(Message message) {
            switch (message.what) {
                case CMD_CAPTIVE_CHECK_COMPLETE:
                    log(getName() + " CMD_CAPTIVE_CHECK_COMPLETE");
                    try {
                        mNwService.enableIpv6(mInterfaceName);
                    } catch (RemoteException re) {
                        loge("Failed to enable IPv6: " + re);
                    } catch (IllegalStateException e) {
                        loge("Failed to enable IPv6: " + e);
                    }
                    setNetworkDetailedState(DetailedState.CONNECTED);
                    mWifiConfigStore.updateStatus(mLastNetworkId, DetailedState.CONNECTED);
                    sendNetworkStateChangeBroadcast(mLastBssid);
                    transitionTo(mConnectedState);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class ConnectedState extends State {
        @Override
        public boolean processMessage(Message message) {
            switch (message.what) {
               case WifiWatchdogStateMachine.POOR_LINK_DETECTED:
                    if (DBG) log("Watchdog reports poor link");
                    try {
                        mNwService.disableIpv6(mInterfaceName);
                    } catch (RemoteException re) {
                        loge("Failed to disable IPv6: " + re);
                    } catch (IllegalStateException e) {
                        loge("Failed to disable IPv6: " + e);
                    }
                    /* Report a disconnect */
                    setNetworkDetailedState(DetailedState.DISCONNECTED);
                    mWifiConfigStore.updateStatus(mLastNetworkId, DetailedState.DISCONNECTED);
                    sendNetworkStateChangeBroadcast(mLastBssid);

                    transitionTo(mVerifyingLinkState);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
        @Override
        public void exit() {
            /* Request a CS wakelock during transition to mobile */
            checkAndSetConnectivityInstance();
            mCm.requestNetworkTransitionWakelock(getName());
        }
    }

    class DisconnectingState extends State {
        @Override
        public boolean processMessage(Message message) {
            switch (message.what) {
                case CMD_SET_OPERATIONAL_MODE:
                    if (message.arg1 != CONNECT_MODE) {
                        deferMessage(message);
                    }
                    break;
                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                    /* If we get a SUPPLICANT_STATE_CHANGE_EVENT before NETWORK_DISCONNECTION_EVENT
                     * we have missed the network disconnection, transition to mDisconnectedState
                     * and handle the rest of the events there
                     */
                    deferMessage(message);
                    handleNetworkDisconnect();
                    transitionTo(mDisconnectedState);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class DisconnectedState extends State {
        private boolean mAlarmEnabled = false;
        /* This is set from the overlay config file or from a secure setting.
         * A value of 0 disables scanning in the framework.
         */
        private long mFrameworkScanIntervalMs;

        private void setScanAlarm(boolean enabled) {
            if (enabled == mAlarmEnabled) return;
            if (enabled) {
                if (mFrameworkScanIntervalMs > 0) {
                    mAlarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
                            System.currentTimeMillis() + mFrameworkScanIntervalMs,
                            mFrameworkScanIntervalMs,
                            mScanIntent);
                    mAlarmEnabled = true;
                }
            } else {
                mAlarmManager.cancel(mScanIntent);
                mAlarmEnabled = false;
            }
        }

        @Override
        public void enter() {
            // We dont scan frequently if this is a temporary disconnect
            // due to p2p
            if (mTemporarilyDisconnectWifi) {
                mWifiP2pChannel.sendMessage(WifiP2pService.DISCONNECT_WIFI_RESPONSE);
                return;
            }

            mFrameworkScanIntervalMs = Settings.Global.getLong(mContext.getContentResolver(),
                    Settings.Global.WIFI_FRAMEWORK_SCAN_INTERVAL_MS,
                    mDefaultFrameworkScanIntervalMs);
            /*
             * We initiate background scanning if it is enabled, otherwise we
             * initiate an infrequent scan that wakes up the device to ensure
             * a user connects to an access point on the move
             */
            if (mEnableBackgroundScan) {
                /* If a regular scan result is pending, do not initiate background
                 * scan until the scan results are returned. This is needed because
                 * initiating a background scan will cancel the regular scan and
                 * scan results will not be returned until background scanning is
                 * cleared
                 */
                if (!mScanResultIsPending) {
                    mWifiNative.enableBackgroundScan(true);
                }
            } else {
                setScanAlarm(true);
            }

            /**
             * If we have no networks saved, the supplicant stops doing the periodic scan.
             * The scans are useful to notify the user of the presence of an open network.
             * Note that these are not wake up scans.
             */
            if (!mP2pConnected.get() && mWifiConfigStore.getConfiguredNetworks().size() == 0) {
                sendMessageDelayed(obtainMessage(CMD_NO_NETWORKS_PERIODIC_SCAN,
                            ++mPeriodicScanToken, 0), mSupplicantScanIntervalMs);
            }
        }
        @Override
        public boolean processMessage(Message message) {
            boolean ret = HANDLED;
            switch (message.what) {
                case CMD_NO_NETWORKS_PERIODIC_SCAN:
                    if (mP2pConnected.get()) break;
                    if (message.arg1 == mPeriodicScanToken &&
                            mWifiConfigStore.getConfiguredNetworks().size() == 0) {
                        sendMessage(CMD_START_SCAN, UNKNOWN_SCAN_SOURCE, 0, (WorkSource) null);
                        sendMessageDelayed(obtainMessage(CMD_NO_NETWORKS_PERIODIC_SCAN,
                                    ++mPeriodicScanToken, 0), mSupplicantScanIntervalMs);
                    }
                    break;
                case WifiManager.FORGET_NETWORK:
                case CMD_REMOVE_NETWORK:
                    // Set up a delayed message here. After the forget/remove is handled
                    // the handled delayed message will determine if there is a need to
                    // scan and continue
                    sendMessageDelayed(obtainMessage(CMD_NO_NETWORKS_PERIODIC_SCAN,
                                ++mPeriodicScanToken, 0), mSupplicantScanIntervalMs);
                    ret = NOT_HANDLED;
                    break;
                case CMD_SET_OPERATIONAL_MODE:
                    if (message.arg1 != CONNECT_MODE) {
                        mOperationalMode = message.arg1;

                        mWifiConfigStore.disableAllNetworks();
                        if (mOperationalMode == SCAN_ONLY_WITH_WIFI_OFF_MODE) {
                            mWifiP2pChannel.sendMessage(CMD_DISABLE_P2P_REQ);
                            setWifiState(WIFI_STATE_DISABLED);
                        }

                        transitionTo(mScanModeState);
                    }
                    break;
                case CMD_ENABLE_BACKGROUND_SCAN:
                    mEnableBackgroundScan = (message.arg1 == 1);
                    if (mEnableBackgroundScan) {
                        mWifiNative.enableBackgroundScan(true);
                        setScanAlarm(false);
                    } else {
                        mWifiNative.enableBackgroundScan(false);
                        setScanAlarm(true);
                    }
                    break;
                    /* Ignore network disconnect */
                case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                    break;
                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                    StateChangeResult stateChangeResult = (StateChangeResult) message.obj;
                    setNetworkDetailedState(WifiInfo.getDetailedStateOf(stateChangeResult.state));
                    /* ConnectModeState does the rest of the handling */
                    ret = NOT_HANDLED;
                    break;
                case CMD_START_SCAN:
                    /* Disable background scan temporarily during a regular scan */
                    if (mEnableBackgroundScan) {
                        mWifiNative.enableBackgroundScan(false);
                    }
                    /* Handled in parent state */
                    ret = NOT_HANDLED;
                    break;
                case WifiMonitor.SCAN_RESULTS_EVENT:
                    /* Re-enable background scan when a pending scan result is received */
                    if (mEnableBackgroundScan && mScanResultIsPending) {
                        mWifiNative.enableBackgroundScan(true);
                    }
                    /* Handled in parent state */
                    ret = NOT_HANDLED;
                    break;
                case WifiP2pService.P2P_CONNECTION_CHANGED:
                    NetworkInfo info = (NetworkInfo) message.obj;
                    mP2pConnected.set(info.isConnected());
                    if (mP2pConnected.get()) {
                        int defaultInterval = mContext.getResources().getInteger(
                                R.integer.config_wifi_scan_interval_p2p_connected);
                        long scanIntervalMs = Settings.Global.getLong(mContext.getContentResolver(),
                                Settings.Global.WIFI_SCAN_INTERVAL_WHEN_P2P_CONNECTED_MS,
                                defaultInterval);
                        mWifiNative.setScanInterval((int) scanIntervalMs/1000);
                    } else if (mWifiConfigStore.getConfiguredNetworks().size() == 0) {
                        if (DBG) log("Turn on scanning after p2p disconnected");
                        sendMessageDelayed(obtainMessage(CMD_NO_NETWORKS_PERIODIC_SCAN,
                                    ++mPeriodicScanToken, 0), mSupplicantScanIntervalMs);
                    }
                case CMD_RECONNECT:
                case CMD_REASSOCIATE:
                    if (mTemporarilyDisconnectWifi) {
                        // Drop a third party reconnect/reassociate if STA is
                        // temporarily disconnected for p2p
                        break;
                    } else {
                        // ConnectModeState handles it
                        ret = NOT_HANDLED;
                    }
                    break;
                default:
                    ret = NOT_HANDLED;
            }
            return ret;
        }

        @Override
        public void exit() {
            /* No need for a background scan upon exit from a disconnected state */
            if (mEnableBackgroundScan) {
                mWifiNative.enableBackgroundScan(false);
            }
            setScanAlarm(false);
        }
    }

    class WpsRunningState extends State {
        //Tracks the source to provide a reply
        private Message mSourceMessage;
        @Override
        public void enter() {
            mSourceMessage = Message.obtain(getCurrentMessage());
        }
        @Override
        public boolean processMessage(Message message) {
            switch (message.what) {
                case WifiMonitor.WPS_SUCCESS_EVENT:
                    // Ignore intermediate success, wait for full connection
                    break;
                case WifiMonitor.NETWORK_CONNECTION_EVENT:
                    replyToMessage(mSourceMessage, WifiManager.WPS_COMPLETED);
                    mSourceMessage.recycle();
                    mSourceMessage = null;
                    deferMessage(message);
                    transitionTo(mDisconnectedState);
                    break;
                case WifiMonitor.WPS_OVERLAP_EVENT:
                    replyToMessage(mSourceMessage, WifiManager.WPS_FAILED,
                            WifiManager.WPS_OVERLAP_ERROR);
                    mSourceMessage.recycle();
                    mSourceMessage = null;
                    transitionTo(mDisconnectedState);
                    break;
                case WifiMonitor.WPS_FAIL_EVENT:
                    //arg1 has the reason for the failure
                    replyToMessage(mSourceMessage, WifiManager.WPS_FAILED, message.arg1);
                    mSourceMessage.recycle();
                    mSourceMessage = null;
                    transitionTo(mDisconnectedState);
                    break;
                case WifiMonitor.WPS_TIMEOUT_EVENT:
                    replyToMessage(mSourceMessage, WifiManager.WPS_FAILED,
                            WifiManager.WPS_TIMED_OUT);
                    mSourceMessage.recycle();
                    mSourceMessage = null;
                    transitionTo(mDisconnectedState);
                    break;
                case WifiManager.START_WPS:
                    replyToMessage(message, WifiManager.WPS_FAILED, WifiManager.IN_PROGRESS);
                    break;
                case WifiManager.CANCEL_WPS:
                    if (mWifiNative.cancelWps()) {
                        replyToMessage(message, WifiManager.CANCEL_WPS_SUCCEDED);
                    } else {
                        replyToMessage(message, WifiManager.CANCEL_WPS_FAILED, WifiManager.ERROR);
                    }
                    transitionTo(mDisconnectedState);
                    break;
                /* Defer all commands that can cause connections to a different network
                 * or put the state machine out of connect mode
                 */
                case CMD_STOP_DRIVER:
                case CMD_SET_OPERATIONAL_MODE:
                case WifiManager.CONNECT_NETWORK:
                case CMD_ENABLE_NETWORK:
                case CMD_RECONNECT:
                case CMD_REASSOCIATE:
                    deferMessage(message);
                    break;
                case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                    if (DBG) log("Network connection lost");
                    handleNetworkDisconnect();
                    break;
                case WifiMonitor.ASSOCIATION_REJECTION_EVENT:
                    if (DBG) log("Ignore Assoc reject event during WPS Connection");
                    break;
                case WifiMonitor.AUTHENTICATION_FAILURE_EVENT:
                    // Disregard auth failure events during WPS connection. The
                    // EAP sequence is retried several times, and there might be
                    // failures (especially for wps pin). We will get a WPS_XXX
                    // event at the end of the sequence anyway.
                    if (DBG) log("Ignore auth failure during WPS connection");
                    break;
                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                    //Throw away supplicant state changes when WPS is running.
                    //We will start getting supplicant state changes once we get
                    //a WPS success or failure
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }

        @Override
        public void exit() {
            mWifiConfigStore.enableAllNetworks();
            mWifiConfigStore.loadConfiguredNetworks();
        }
    }

    class SoftApStartingState extends State {
        @Override
        public void enter() {
            final Message message = getCurrentMessage();
            if (message.what == CMD_START_AP) {
                final WifiConfiguration config = (WifiConfiguration) message.obj;

                if (config == null) {
                    mWifiApConfigChannel.sendMessage(CMD_REQUEST_AP_CONFIG);
                } else {
                    mWifiApConfigChannel.sendMessage(CMD_SET_AP_CONFIG, config);
                    startSoftApWithConfig(config);
                }
            } else {
                throw new RuntimeException("Illegal transition to SoftApStartingState: " + message);
            }
        }
        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case CMD_START_SUPPLICANT:
                case CMD_STOP_SUPPLICANT:
                case CMD_START_AP:
                case CMD_STOP_AP:
                case CMD_START_DRIVER:
                case CMD_STOP_DRIVER:
                case CMD_SET_OPERATIONAL_MODE:
                case CMD_SET_COUNTRY_CODE:
                case CMD_SET_FREQUENCY_BAND:
                case CMD_START_PACKET_FILTERING:
                case CMD_STOP_PACKET_FILTERING:
                case CMD_TETHER_STATE_CHANGE:
                    deferMessage(message);
                    break;
                case WifiStateMachine.CMD_RESPONSE_AP_CONFIG:
                    WifiConfiguration config = (WifiConfiguration) message.obj;
                    if (config != null) {
                        startSoftApWithConfig(config);
                    } else {
                        loge("Softap config is null!");
                        sendMessage(CMD_START_AP_FAILURE);
                    }
                    break;
                case CMD_START_AP_SUCCESS:
                    setWifiApState(WIFI_AP_STATE_ENABLED);
                    transitionTo(mSoftApStartedState);
                    break;
                case CMD_START_AP_FAILURE:
                    setWifiApState(WIFI_AP_STATE_FAILED);
                    transitionTo(mInitialState);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class SoftApStartedState extends State {
        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case CMD_STOP_AP:
                    if (DBG) log("Stopping Soft AP");
                    /* We have not tethered at this point, so we just shutdown soft Ap */
                    try {
                        mNwService.stopAccessPoint(mInterfaceName);
                    } catch(Exception e) {
                        loge("Exception in stopAccessPoint()");
                    }
                    setWifiApState(WIFI_AP_STATE_DISABLED);
                    transitionTo(mInitialState);
                    break;
                case CMD_START_AP:
                    // Ignore a start on a running access point
                    break;
                    /* Fail client mode operation when soft AP is enabled */
                case CMD_START_SUPPLICANT:
                    loge("Cannot start supplicant with a running soft AP");
                    setWifiState(WIFI_STATE_UNKNOWN);
                    break;
                case CMD_TETHER_STATE_CHANGE:
                    TetherStateChange stateChange = (TetherStateChange) message.obj;
                    if (startTethering(stateChange.available)) {
                        transitionTo(mTetheringState);
                    }
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class TetheringState extends State {
        @Override
        public void enter() {
            /* Send ourselves a delayed message to shut down if tethering fails to notify */
            sendMessageDelayed(obtainMessage(CMD_TETHER_NOTIFICATION_TIMED_OUT,
                    ++mTetherToken, 0), TETHER_NOTIFICATION_TIME_OUT_MSECS);
        }
        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case CMD_TETHER_STATE_CHANGE:
                    TetherStateChange stateChange = (TetherStateChange) message.obj;
                    if (isWifiTethered(stateChange.active)) {
                        transitionTo(mTetheredState);
                    }
                    return HANDLED;
                case CMD_TETHER_NOTIFICATION_TIMED_OUT:
                    if (message.arg1 == mTetherToken) {
                        loge("Failed to get tether update, shutdown soft access point");
                        transitionTo(mSoftApStartedState);
                        // Needs to be first thing handled
                        sendMessageAtFrontOfQueue(CMD_STOP_AP);
                    }
                    break;
                case CMD_START_SUPPLICANT:
                case CMD_STOP_SUPPLICANT:
                case CMD_START_AP:
                case CMD_STOP_AP:
                case CMD_START_DRIVER:
                case CMD_STOP_DRIVER:
                case CMD_SET_OPERATIONAL_MODE:
                case CMD_SET_COUNTRY_CODE:
                case CMD_SET_FREQUENCY_BAND:
                case CMD_START_PACKET_FILTERING:
                case CMD_STOP_PACKET_FILTERING:
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class TetheredState extends State {
        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case CMD_TETHER_STATE_CHANGE:
                    TetherStateChange stateChange = (TetherStateChange) message.obj;
                    if (!isWifiTethered(stateChange.active)) {
                        loge("Tethering reports wifi as untethered!, shut down soft Ap");
                        setHostApRunning(null, false);
                        setHostApRunning(null, true);
                    }
                    return HANDLED;
                case CMD_STOP_AP:
                    if (DBG) log("Untethering before stopping AP");
                    setWifiApState(WIFI_AP_STATE_DISABLING);
                    stopTethering();
                    transitionTo(mUntetheringState);
                    // More work to do after untethering
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class UntetheringState extends State {
        @Override
        public void enter() {
            /* Send ourselves a delayed message to shut down if tethering fails to notify */
            sendMessageDelayed(obtainMessage(CMD_TETHER_NOTIFICATION_TIMED_OUT,
                    ++mTetherToken, 0), TETHER_NOTIFICATION_TIME_OUT_MSECS);

        }
        @Override
        public boolean processMessage(Message message) {
            switch(message.what) {
                case CMD_TETHER_STATE_CHANGE:
                    TetherStateChange stateChange = (TetherStateChange) message.obj;

                    /* Wait till wifi is untethered */
                    if (isWifiTethered(stateChange.active)) break;

                    transitionTo(mSoftApStartedState);
                    break;
                case CMD_TETHER_NOTIFICATION_TIMED_OUT:
                    if (message.arg1 == mTetherToken) {
                        loge("Failed to get tether update, force stop access point");
                        transitionTo(mSoftApStartedState);
                    }
                    break;
                case CMD_START_SUPPLICANT:
                case CMD_STOP_SUPPLICANT:
                case CMD_START_AP:
                case CMD_STOP_AP:
                case CMD_START_DRIVER:
                case CMD_STOP_DRIVER:
                case CMD_SET_OPERATIONAL_MODE:
                case CMD_SET_COUNTRY_CODE:
                case CMD_SET_FREQUENCY_BAND:
                case CMD_START_PACKET_FILTERING:
                case CMD_STOP_PACKET_FILTERING:
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    //State machine initiated requests can have replyTo set to null indicating
    //there are no recepients, we ignore those reply actions
    private void replyToMessage(Message msg, int what) {
        if (msg.replyTo == null) return;
        Message dstMsg = obtainMessageWithArg2(msg);
        dstMsg.what = what;
        mReplyChannel.replyToMessage(msg, dstMsg);
    }

    private void replyToMessage(Message msg, int what, int arg1) {
        if (msg.replyTo == null) return;
        Message dstMsg = obtainMessageWithArg2(msg);
        dstMsg.what = what;
        dstMsg.arg1 = arg1;
        mReplyChannel.replyToMessage(msg, dstMsg);
    }

    private void replyToMessage(Message msg, int what, Object obj) {
        if (msg.replyTo == null) return;
        Message dstMsg = obtainMessageWithArg2(msg);
        dstMsg.what = what;
        dstMsg.obj = obj;
        mReplyChannel.replyToMessage(msg, dstMsg);
    }

    /**
     * arg2 on the source message has a unique id that needs to be retained in replies
     * to match the request

     * see WifiManager for details
     */
    private Message obtainMessageWithArg2(Message srcMsg) {
        Message msg = Message.obtain();
        msg.arg2 = srcMsg.arg2;
        return msg;
    }
}