xref: /frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiStateMachine.java

/*
 * 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 com.android.server.wifi;

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 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;

import android.Manifest;
import android.app.ActivityManager;
import android.app.PendingIntent;
import android.bluetooth.BluetoothAdapter;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.ApplicationInfo;
import android.content.pm.IPackageManager;
import android.content.pm.PackageManager;
import android.database.ContentObserver;
import android.net.ConnectivityManager;
import android.net.DhcpResults;
import android.net.IpConfiguration;
import android.net.LinkProperties;
import android.net.Network;
import android.net.NetworkAgent;
import android.net.NetworkCapabilities;
import android.net.NetworkFactory;
import android.net.NetworkInfo;
import android.net.NetworkInfo.DetailedState;
import android.net.NetworkMisc;
import android.net.NetworkRequest;
import android.net.NetworkUtils;
import android.net.RouteInfo;
import android.net.StaticIpConfiguration;
import android.net.TrafficStats;
import android.net.dhcp.DhcpClient;
import android.net.ip.IpManager;
import android.net.wifi.IApInterface;
import android.net.wifi.IClientInterface;
import android.net.wifi.RssiPacketCountInfo;
import android.net.wifi.ScanResult;
import android.net.wifi.ScanSettings;
import android.net.wifi.SupplicantState;
import android.net.wifi.WifiChannel;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiConnectionStatistics;
import android.net.wifi.WifiEnterpriseConfig;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiLinkLayerStats;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiScanner;
import android.net.wifi.WifiSsid;
import android.net.wifi.WpsInfo;
import android.net.wifi.WpsResult;
import android.net.wifi.WpsResult.Status;
import android.net.wifi.p2p.IWifiP2pManager;
import android.os.BatteryStats;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.os.INetworkManagementService;
import android.os.Looper;
import android.os.Message;
import android.os.Messenger;
import android.os.PowerManager;
import android.os.Process;
import android.os.RemoteException;
import android.os.UserHandle;
import android.os.UserManager;
import android.os.WorkSource;
import android.provider.Settings;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import android.util.Log;
import android.util.SparseArray;

import com.android.internal.R;
import com.android.internal.annotations.GuardedBy;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.app.IBatteryStats;
import com.android.internal.util.AsyncChannel;
import com.android.internal.util.MessageUtils;
import com.android.internal.util.Protocol;
import com.android.internal.util.State;
import com.android.internal.util.StateMachine;
import com.android.server.connectivity.KeepalivePacketData;
import com.android.server.wifi.hotspot2.AnqpEvent;
import com.android.server.wifi.hotspot2.IconEvent;
import com.android.server.wifi.hotspot2.NetworkDetail;
import com.android.server.wifi.hotspot2.PasspointManager;
import com.android.server.wifi.hotspot2.Utils;
import com.android.server.wifi.hotspot2.WnmData;
import com.android.server.wifi.p2p.WifiP2pServiceImpl;
import com.android.server.wifi.util.NativeUtil;
import com.android.server.wifi.util.TelephonyUtil;
import com.android.server.wifi.util.TelephonyUtil.SimAuthRequestData;
import com.android.server.wifi.util.TelephonyUtil.SimAuthResponseData;

import java.io.BufferedReader;
import java.io.FileDescriptor;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * TODO:
 * Deprecate WIFI_STATE_UNKNOWN
 */

/**
 * 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 implements WifiNative.WifiRssiEventHandler,
        WifiMulticastLockManager.FilterController {

    private static final String NETWORKTYPE = "WIFI";
    private static final String NETWORKTYPE_UNTRUSTED = "WIFI_UT";
    @VisibleForTesting public static final short NUM_LOG_RECS_NORMAL = 100;
    @VisibleForTesting public static final short NUM_LOG_RECS_VERBOSE_LOW_MEMORY = 200;
    @VisibleForTesting public static final short NUM_LOG_RECS_VERBOSE = 3000;
    private static final String TAG = "WifiStateMachine";

    private static final int ONE_HOUR_MILLI = 1000 * 60 * 60;

    private static final String GOOGLE_OUI = "DA-A1-19";

    private static final String EXTRA_OSU_ICON_QUERY_BSSID = "BSSID";
    private static final String EXTRA_OSU_ICON_QUERY_FILENAME = "FILENAME";

    private boolean mVerboseLoggingEnabled = false;

    /* debug flag, indicating if handling of ASSOCIATION_REJECT ended up blacklisting
     * the corresponding BSSID.
     */
    private boolean didBlackListBSSID = false;

    /**
     * Log with error attribute
     *
     * @param s is string log
     */
    @Override
    protected void loge(String s) {
        Log.e(getName(), s);
    }
    @Override
    protected void logd(String s) {
        Log.d(getName(), s);
    }
    @Override
    protected void log(String s) {
        Log.d(getName(), s);
    }
    private WifiMetrics mWifiMetrics;
    private WifiInjector mWifiInjector;
    private WifiMonitor mWifiMonitor;
    private WifiNative mWifiNative;
    private WifiConfigManager mWifiConfigManager;
    private WifiConnectivityManager mWifiConnectivityManager;
    private WifiNetworkSelector mWifiNetworkSelector;
    private INetworkManagementService mNwService;
    private IClientInterface mClientInterface;
    private ConnectivityManager mCm;
    private BaseWifiDiagnostics mWifiDiagnostics;
    private WifiApConfigStore mWifiApConfigStore;
    private final boolean mP2pSupported;
    private final AtomicBoolean mP2pConnected = new AtomicBoolean(false);
    private boolean mTemporarilyDisconnectWifi = false;
    private final String mPrimaryDeviceType;
    private final Clock mClock;
    private final PropertyService mPropertyService;
    private final BuildProperties mBuildProperties;
    private final WifiCountryCode mCountryCode;
    // Object holding most recent wifi score report and bad Linkspeed count
    private final WifiScoreReport mWifiScoreReport;
    private final PasspointManager mPasspointManager;

    /* Scan results handling */
    private List<ScanDetail> mScanResults = new ArrayList<>();
    private final Object mScanResultsLock = new Object();

    // For debug, number of known scan results that were found as part of last scan result event,
    // as well the number of scans results returned by the supplicant with that message
    private int mNumScanResultsKnown;
    private int mNumScanResultsReturned;

    private boolean mScreenOn = false;

    private final String mInterfaceName;

    private int mLastSignalLevel = -1;
    private String mLastBssid;
    private int mLastNetworkId; // The network Id we successfully joined
    private boolean mIsLinkDebouncing = false;
    private final StateMachineDeathRecipient mDeathRecipient =
            new StateMachineDeathRecipient(this, CMD_CLIENT_INTERFACE_BINDER_DEATH);
    private boolean mIpReachabilityDisconnectEnabled = true;

    @Override
    public void onRssiThresholdBreached(byte curRssi) {
        if (mVerboseLoggingEnabled) {
            Log.e(TAG, "onRssiThresholdBreach event. Cur Rssi = " + curRssi);
        }
        sendMessage(CMD_RSSI_THRESHOLD_BREACH, curRssi);
    }

    public void processRssiThreshold(byte curRssi, int reason) {
        if (curRssi == Byte.MAX_VALUE || curRssi == Byte.MIN_VALUE) {
            Log.wtf(TAG, "processRssiThreshold: Invalid rssi " + curRssi);
            return;
        }
        for (int i = 0; i < mRssiRanges.length; i++) {
            if (curRssi < mRssiRanges[i]) {
                // Assume sorted values(ascending order) for rssi,
                // bounded by high(127) and low(-128) at extremeties
                byte maxRssi = mRssiRanges[i];
                byte minRssi = mRssiRanges[i-1];
                // This value of hw has to be believed as this value is averaged and has breached
                // the rssi thresholds and raised event to host. This would be eggregious if this
                // value is invalid
                mWifiInfo.setRssi(curRssi);
                updateCapabilities(getCurrentWifiConfiguration());
                int ret = startRssiMonitoringOffload(maxRssi, minRssi);
                Log.d(TAG, "Re-program RSSI thresholds for " + smToString(reason) +
                        ": [" + minRssi + ", " + maxRssi + "], curRssi=" + curRssi + " ret=" + ret);
                break;
            }
        }
    }

    // Testing various network disconnect cases by sending lots of spurious
    // disconnect to supplicant
    private boolean testNetworkDisconnect = false;

    private boolean mEnableRssiPolling = false;
    private int mRssiPollToken = 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 mIsScanOngoing = false;
    private boolean mIsFullScanOngoing = false;

    private final Queue<Message> mBufferedScanMsg = new LinkedList<>();
    private static final int UNKNOWN_SCAN_SOURCE = -1;
    private static final int ADD_OR_UPDATE_SOURCE = -3;

    private static final int SCAN_REQUEST_BUFFER_MAX_SIZE = 10;
    private static final String CUSTOMIZED_SCAN_SETTING = "customized_scan_settings";
    private static final String CUSTOMIZED_SCAN_WORKSOURCE = "customized_scan_worksource";
    private static final String SCAN_REQUEST_TIME = "scan_request_time";

    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;

    /**
     * Interval in milliseconds between receiving a disconnect event
     * while connected to a good AP, and handling the disconnect proper
     */
    private static final int LINK_FLAPPING_DEBOUNCE_MSEC = 4000;

    /**
     * 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;

    /**
     * Value to set in wpa_supplicant "bssid" field when we don't want to restrict connection to
     * a specific AP.
     */
    private static final String SUPPLICANT_BSSID_ANY = "any";

    private int mSupplicantRestartCount = 0;

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

    /* 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;

    // NOTE: Do not return to clients - use #getWiFiInfoForUid(int)
    private final WifiInfo mWifiInfo;
    private NetworkInfo mNetworkInfo;
    private final NetworkCapabilities mDfltNetworkCapabilities;
    private SupplicantStateTracker mSupplicantStateTracker;

    private int mWifiLinkLayerStatsSupported = 4; // Temporary disable

    // Whether the state machine goes thru the Disconnecting->Disconnected->ObtainingIpAddress
    private boolean mAutoRoaming = false;

    // Roaming failure count
    private int mRoamFailCount = 0;

    // This is the BSSID we are trying to associate to, it can be set to SUPPLICANT_BSSID_ANY
    // if we havent selected a BSSID for joining.
    private String mTargetRoamBSSID = SUPPLICANT_BSSID_ANY;
    // This one is used to track whta is the current target network ID. This is used for error
    // handling during connection setup since many error message from supplicant does not report
    // SSID Once connected, it will be set to invalid
    private int mTargetNetworkId = WifiConfiguration.INVALID_NETWORK_ID;
    private long mLastDriverRoamAttempt = 0;
    private WifiConfiguration targetWificonfiguration = null;

    boolean isRoaming() {
        return mAutoRoaming;
    }

    /**
     * Method to clear {@link #mTargetRoamBSSID} and reset the the current connected network's
     * bssid in wpa_supplicant after a roam/connect attempt.
     */
    public boolean clearTargetBssid(String dbg) {
        WifiConfiguration config = mWifiConfigManager.getConfiguredNetwork(mTargetNetworkId);
        if (config == null) {
            return false;
        }
        String bssid = SUPPLICANT_BSSID_ANY;
        if (config.BSSID != null) {
            bssid = config.BSSID;
            if (mVerboseLoggingEnabled) {
                Log.d(TAG, "force BSSID to " + bssid + "due to config");
            }
        }
        if (mVerboseLoggingEnabled) {
            logd(dbg + " clearTargetBssid " + bssid + " key=" + config.configKey());
        }
        mTargetRoamBSSID = bssid;
        return mWifiNative.setConfiguredNetworkBSSID(bssid);
    }

    /**
     * Set Config's default BSSID (for association purpose) and {@link #mTargetRoamBSSID}
     * @param config config need set BSSID
     * @param bssid  default BSSID to assocaite with when connect to this network
     * @return false -- does not change the current default BSSID of the configure
     *         true -- change the  current default BSSID of the configur
     */
    private boolean setTargetBssid(WifiConfiguration config, String bssid) {
        if (config == null || bssid == null) {
            return false;
        }
        if (config.BSSID != null) {
            bssid = config.BSSID;
            if (mVerboseLoggingEnabled) {
                Log.d(TAG, "force BSSID to " + bssid + "due to config");
            }
        }
        if (mVerboseLoggingEnabled) {
            Log.d(TAG, "setTargetBssid set to " + bssid + " key=" + config.configKey());
        }
        mTargetRoamBSSID = bssid;
        config.getNetworkSelectionStatus().setNetworkSelectionBSSID(bssid);
        return true;
    }

    private final IpManager mIpManager;

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

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

    private WifiScanner mWifiScanner;

    @GuardedBy("mWifiReqCountLock")
    private int mConnectionReqCount = 0;
    private WifiNetworkFactory mNetworkFactory;
    @GuardedBy("mWifiReqCountLock")
    private int mUntrustedReqCount = 0;
    private UntrustedWifiNetworkFactory mUntrustedNetworkFactory;
    private WifiNetworkAgent mNetworkAgent;
    private final Object mWifiReqCountLock = new Object();

    private byte[] mRssiRanges;

    // Keep track of various statistics, for retrieval by System Apps, i.e. under @SystemApi
    // We should really persist that into the networkHistory.txt file, and read it back when
    // WifiStateMachine starts up
    private WifiConnectionStatistics mWifiConnectionStatistics = new WifiConnectionStatistics();

    // Used to filter out requests we couldn't possibly satisfy.
    private final NetworkCapabilities mNetworkCapabilitiesFilter = new NetworkCapabilities();

    // Provide packet filter capabilities to ConnectivityService.
    private final NetworkMisc mNetworkMisc = new NetworkMisc();

    /* 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;
    /* 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;
    /* A delayed message sent to start driver when it fail to come up */
    static final int CMD_DRIVER_START_TIMED_OUT                         = BASE + 19;

    /* Start the soft access point */
    static final int CMD_START_AP                                       = BASE + 21;
    /* Indicates soft ap start failed */
    static final int CMD_START_AP_FAILURE                               = BASE + 22;
    /* Stop the soft access point */
    static final int CMD_STOP_AP                                        = BASE + 23;
    /* Soft access point teardown is completed. */
    static final int CMD_AP_STOPPED                                     = BASE + 24;

    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;
    /* Save configuration */
    static final int CMD_SAVE_CONFIG                                    = BASE + 58;
    /* Get configured networks */
    static final int CMD_GET_CONFIGURED_NETWORKS                        = BASE + 59;
    /* Get adaptors */
    static final int CMD_GET_SUPPORTED_FEATURES                         = BASE + 61;
    /* Get configured networks with real preSharedKey */
    static final int CMD_GET_PRIVILEGED_CONFIGURED_NETWORKS             = BASE + 62;
    /* Get Link Layer Stats thru HAL */
    static final int CMD_GET_LINK_LAYER_STATS                           = BASE + 63;
    /* 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;
    /* Get Connection Statistis */
    static final int CMD_GET_CONNECTION_STATISTICS                      = BASE + 76;

    /* 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;
    /* Enables RSSI poll */
    static final int CMD_ENABLE_RSSI_POLL                               = BASE + 82;
    /* RSSI poll */
    static final int CMD_RSSI_POLL                                      = BASE + 83;
    /* Enable suspend mode optimizations in the driver */
    static final int CMD_SET_SUSPEND_OPT_ENABLED                        = BASE + 86;
    /* Delayed NETWORK_DISCONNECT */
    static final int CMD_DELAYED_NETWORK_DISCONNECT                     = BASE + 87;
    /* 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;
    /* Test network Disconnection NETWORK_DISCONNECT */
    static final int CMD_TEST_NETWORK_DISCONNECT                        = BASE + 89;

    private int testNetworkDisconnectCounter = 0;

    /* Enable TDLS on a specific MAC address */
    static final int CMD_ENABLE_TDLS                                    = BASE + 92;

    /**
     * Watchdog for protecting against b/16823537
     * Leave time for 4-way handshake to succeed
     */
    static final int ROAM_GUARD_TIMER_MSEC = 15000;

    int roamWatchdogCount = 0;
    /* Roam state watchdog */
    static final int CMD_ROAM_WATCHDOG_TIMER                            = BASE + 94;
    /* Screen change intent handling */
    static final int CMD_SCREEN_STATE_CHANGED                           = BASE + 95;

    /* Disconnecting state watchdog */
    static final int CMD_DISCONNECTING_WATCHDOG_TIMER                   = BASE + 96;

    /* Remove a packages associated configrations */
    static final int CMD_REMOVE_APP_CONFIGURATIONS                      = BASE + 97;

    /* Disable an ephemeral network */
    static final int CMD_DISABLE_EPHEMERAL_NETWORK                      = BASE + 98;

    /* Get matching network */
    static final int CMD_GET_MATCHING_CONFIG                            = BASE + 99;

    /* alert from firmware */
    static final int CMD_FIRMWARE_ALERT                                 = BASE + 100;

    /* SIM is removed; reset any cached data for it */
    static final int CMD_RESET_SIM_NETWORKS                             = BASE + 101;

    /* OSU APIs */
    static final int CMD_QUERY_OSU_ICON                                 = BASE + 104;

    /* try to match a provider with current network */
    static final int CMD_MATCH_PROVIDER_NETWORK                         = BASE + 105;

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

    int disconnectingWatchdogCount = 0;
    static final int DISCONNECTING_GUARD_TIMER_MSEC = 5000;

    /* 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;

    /**
     * Indicates the end of boot process, should be used to trigger load from config store,
     * initiate connection attempt, etc.
     * */
    static final int CMD_BOOT_COMPLETED                                 = BASE + 134;
    /**
     * Initialize the WifiStateMachine. This is currently used to initialize the
     * {@link HalDeviceManager} module.
     */
    static final int CMD_INITIALIZE                                     = BASE + 135;

    /* We now have a valid IP configuration. */
    static final int CMD_IP_CONFIGURATION_SUCCESSFUL                    = BASE + 138;
    /* We no longer have a valid IP configuration. */
    static final int CMD_IP_CONFIGURATION_LOST                          = BASE + 139;
    /* Link configuration (IP address, DNS, ...) changes notified via netlink */
    static final int CMD_UPDATE_LINKPROPERTIES                          = BASE + 140;

    /* Supplicant is trying to associate to a given BSSID */
    static final int CMD_TARGET_BSSID                                   = BASE + 141;

    /* Reload all networks and reconnect */
    static final int CMD_RELOAD_TLS_AND_RECONNECT                       = BASE + 142;

    static final int CMD_START_CONNECT                                  = BASE + 143;

    private static final int NETWORK_STATUS_UNWANTED_DISCONNECT         = 0;
    private static final int NETWORK_STATUS_UNWANTED_VALIDATION_FAILED  = 1;
    private static final int NETWORK_STATUS_UNWANTED_DISABLE_AUTOJOIN   = 2;

    static final int CMD_UNWANTED_NETWORK                               = BASE + 144;

    static final int CMD_START_ROAM                                     = BASE + 145;

    static final int CMD_ASSOCIATED_BSSID                               = BASE + 147;

    static final int CMD_NETWORK_STATUS                                 = BASE + 148;

    /* A layer 3 neighbor on the Wi-Fi link became unreachable. */
    static final int CMD_IP_REACHABILITY_LOST                           = BASE + 149;

    /* Remove a packages associated configrations */
    static final int CMD_REMOVE_USER_CONFIGURATIONS                     = BASE + 152;

    static final int CMD_ACCEPT_UNVALIDATED                             = BASE + 153;

    /* used to offload sending IP packet */
    static final int CMD_START_IP_PACKET_OFFLOAD                        = BASE + 160;

    /* used to stop offload sending IP packet */
    static final int CMD_STOP_IP_PACKET_OFFLOAD                         = BASE + 161;

    /* used to start rssi monitoring in hw */
    static final int CMD_START_RSSI_MONITORING_OFFLOAD                  = BASE + 162;

    /* used to stop rssi moniroting in hw */
    static final int CMD_STOP_RSSI_MONITORING_OFFLOAD                   = BASE + 163;

    /* used to indicated RSSI threshold breach in hw */
    static final int CMD_RSSI_THRESHOLD_BREACH                          = BASE + 164;

    /* Enable/Disable WifiConnectivityManager */
    static final int CMD_ENABLE_WIFI_CONNECTIVITY_MANAGER               = BASE + 166;

    /* Enable/Disable AutoJoin when associated */
    static final int CMD_ENABLE_AUTOJOIN_WHEN_ASSOCIATED                = BASE + 167;

    /**
     * Used to handle messages bounced between WifiStateMachine and IpManager.
     */
    static final int CMD_IPV4_PROVISIONING_SUCCESS                      = BASE + 200;
    static final int CMD_IPV4_PROVISIONING_FAILURE                      = BASE + 201;

    /* Push a new APF program to the HAL */
    static final int CMD_INSTALL_PACKET_FILTER                          = BASE + 202;

    /* Enable/disable fallback packet filtering */
    static final int CMD_SET_FALLBACK_PACKET_FILTERING                  = BASE + 203;

    /* Enable/disable Neighbor Discovery offload functionality. */
    static final int CMD_CONFIG_ND_OFFLOAD                              = BASE + 204;

    /* used to indicate that the foreground user was switched */
    static final int CMD_USER_SWITCH                                    = BASE + 205;

    /* used to indicate that the foreground user was switched */
    static final int CMD_USER_UNLOCK                                    = BASE + 206;

    /* used to indicate that the foreground user was switched */
    static final int CMD_USER_STOP                                      = BASE + 207;

    /* Signals that IClientInterface instance underpinning our state is dead. */
    private static final int CMD_CLIENT_INTERFACE_BINDER_DEATH          = BASE + 250;

    /* Indicates that diagnostics should time out a connection start event. */
    private static final int CMD_DIAGS_CONNECT_TIMEOUT                  = BASE + 251;

    // For message logging.
    private static final Class[] sMessageClasses = {
            AsyncChannel.class, WifiStateMachine.class, DhcpClient.class };
    private static final SparseArray<String> sSmToString =
            MessageUtils.findMessageNames(sMessageClasses);


    /* 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;
    /* DISABLED_MODE - Don't connect, don't scan, don't be an AP */
    public static final int DISABLED_MODE = 4;

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

    /* 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);

    /**
     * Scan period for the NO_NETWORKS_PERIIDOC_SCAN_FEATURE
     */
    private final int mNoNetworksPeriodicScan;

    /**
     * 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;

    private boolean mEnableAutoJoinWhenAssociated;
    private int mAlwaysEnableScansWhileAssociated;
    private final int mThresholdQualifiedRssi24;
    private final int mThresholdQualifiedRssi5;
    private final int mThresholdSaturatedRssi24;
    private final int mThresholdSaturatedRssi5;
    private final int mThresholdMinimumRssi5;
    private final int mThresholdMinimumRssi24;
    private final boolean mEnableLinkDebouncing;
    private final boolean mEnableChipWakeUpWhenAssociated;
    private final boolean mEnableRssiPollWhenAssociated;

    int mRunningBeaconCount = 0;

    /* 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();
    /* 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();
    /* 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();
    /* Connected with IP addr */
    private State mConnectedState = new ConnectedState();
    /* Roaming */
    private State mRoamingState = new RoamingState();
    /* 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 state */
    private State mSoftApState = new SoftApState();

    /**
     * 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);

    /**
     * Work source to use to blame usage on the WiFi service
     */
    public static final WorkSource WIFI_WORK_SOURCE = new WorkSource(Process.WIFI_UID);

    /**
     * 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 TelephonyManager mTelephonyManager;
    private TelephonyManager getTelephonyManager() {
        if (mTelephonyManager == null) {
            mTelephonyManager = mWifiInjector.makeTelephonyManager();
        }
        return mTelephonyManager;
    }

    private final IBatteryStats mBatteryStats;

    private final String mTcpBufferSizes;

    // Used for debug and stats gathering
    private static int sScanAlarmIntentCount = 0;

    private FrameworkFacade mFacade;
    private WifiStateTracker mWifiStateTracker;
    private final BackupManagerProxy mBackupManagerProxy;

    public WifiStateMachine(Context context, FrameworkFacade facade, Looper looper,
                            UserManager userManager, WifiInjector wifiInjector,
                            BackupManagerProxy backupManagerProxy, WifiCountryCode countryCode,
                            WifiNative wifiNative) {
        super("WifiStateMachine", looper);
        mWifiInjector = wifiInjector;
        mWifiMetrics = mWifiInjector.getWifiMetrics();
        mClock = wifiInjector.getClock();
        mPropertyService = wifiInjector.getPropertyService();
        mBuildProperties = wifiInjector.getBuildProperties();
        mContext = context;
        mFacade = facade;
        mWifiNative = wifiNative;
        mBackupManagerProxy = backupManagerProxy;

        // TODO refactor WifiNative use of context out into it's own class
        mWifiNative.initContext(mContext);
        mInterfaceName = mWifiNative.getInterfaceName();
        mNetworkInfo = new NetworkInfo(ConnectivityManager.TYPE_WIFI, 0, NETWORKTYPE, "");
        mBatteryStats = IBatteryStats.Stub.asInterface(mFacade.getService(
                BatteryStats.SERVICE_NAME));
        mWifiStateTracker = wifiInjector.getWifiStateTracker();
        IBinder b = mFacade.getService(Context.NETWORKMANAGEMENT_SERVICE);
        mNwService = INetworkManagementService.Stub.asInterface(b);

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

        mWifiConfigManager = mWifiInjector.getWifiConfigManager();
        mWifiApConfigStore = mWifiInjector.getWifiApConfigStore();
        mWifiNative.setSystemSupportsFastBssTransition(
                mContext.getResources().getBoolean(R.bool.config_wifi_fast_bss_transition_enabled));

        mPasspointManager = mWifiInjector.getPasspointManager();

        mWifiMonitor = WifiMonitor.getInstance();
        mWifiDiagnostics = mWifiInjector.makeWifiDiagnostics(mWifiNative);

        mWifiInfo = new WifiInfo();
        mWifiNetworkSelector = mWifiInjector.getWifiNetworkSelector();
        mSupplicantStateTracker =
                mFacade.makeSupplicantStateTracker(context, mWifiConfigManager, getHandler());

        mLinkProperties = new LinkProperties();

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

        mIpManager = mFacade.makeIpManager(mContext, mInterfaceName, new IpManagerCallback());
        mIpManager.setMulticastFilter(true);

        mNoNetworksPeriodicScan = mContext.getResources().getInteger(
                R.integer.config_wifi_no_network_periodic_scan_interval);

        // TODO: remove these settings from the config file since we no longer obey them
        // mContext.getResources().getInteger(R.integer.config_wifi_framework_scan_interval);
        // mContext.getResources().getBoolean(R.bool.config_wifi_background_scan_support);

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

        mCountryCode = countryCode;

        mWifiScoreReport = new WifiScoreReport(mContext, mWifiConfigManager);

        mUserWantsSuspendOpt.set(mFacade.getIntegerSetting(mContext,
                Settings.Global.WIFI_SUSPEND_OPTIMIZATIONS_ENABLED, 1) == 1);

        mNetworkCapabilitiesFilter.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
        mNetworkCapabilitiesFilter.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET);
        mNetworkCapabilitiesFilter.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_METERED);
        mNetworkCapabilitiesFilter.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED);
        mNetworkCapabilitiesFilter.setLinkUpstreamBandwidthKbps(1024 * 1024);
        mNetworkCapabilitiesFilter.setLinkDownstreamBandwidthKbps(1024 * 1024);
        // TODO - needs to be a bit more dynamic
        mDfltNetworkCapabilities = new NetworkCapabilities(mNetworkCapabilitiesFilter);

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

                        if (action.equals(Intent.ACTION_SCREEN_ON)) {
                            sendMessage(CMD_SCREEN_STATE_CHANGED, 1);
                        } else if (action.equals(Intent.ACTION_SCREEN_OFF)) {
                            sendMessage(CMD_SCREEN_STATE_CHANGED, 0);
                        }
                    }
                }, filter);

        mContext.getContentResolver().registerContentObserver(Settings.Global.getUriFor(
                        Settings.Global.WIFI_SUSPEND_OPTIMIZATIONS_ENABLED), false,
                new ContentObserver(getHandler()) {
                    @Override
                    public void onChange(boolean selfChange) {
                        mUserWantsSuspendOpt.set(mFacade.getIntegerSetting(mContext,
                                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_LOCKED_BOOT_COMPLETED));

        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);

        mTcpBufferSizes = mContext.getResources().getString(
                com.android.internal.R.string.config_wifi_tcp_buffers);

        // Load Device configs
        mEnableAutoJoinWhenAssociated = context.getResources().getBoolean(
                R.bool.config_wifi_framework_enable_associated_network_selection);
        mThresholdQualifiedRssi24 = context.getResources().getInteger(
                R.integer.config_wifi_framework_wifi_score_low_rssi_threshold_24GHz);
        mThresholdQualifiedRssi5 = context.getResources().getInteger(
                R.integer.config_wifi_framework_wifi_score_low_rssi_threshold_5GHz);
        mThresholdSaturatedRssi24 = context.getResources().getInteger(
                R.integer.config_wifi_framework_wifi_score_good_rssi_threshold_24GHz);
        mThresholdSaturatedRssi5 = context.getResources().getInteger(
                R.integer.config_wifi_framework_wifi_score_good_rssi_threshold_5GHz);
        mThresholdMinimumRssi5 = context.getResources().getInteger(
                R.integer.config_wifi_framework_wifi_score_bad_rssi_threshold_5GHz);
        mThresholdMinimumRssi24 = context.getResources().getInteger(
                R.integer.config_wifi_framework_wifi_score_bad_rssi_threshold_24GHz);
        mEnableLinkDebouncing = mContext.getResources().getBoolean(
                R.bool.config_wifi_enable_disconnection_debounce);
        mEnableChipWakeUpWhenAssociated = true;
        mEnableRssiPollWhenAssociated = true;

        // CHECKSTYLE:OFF IndentationCheck
        addState(mDefaultState);
            addState(mInitialState, mDefaultState);
            addState(mSupplicantStartingState, mDefaultState);
            addState(mSupplicantStartedState, mDefaultState);
                    addState(mScanModeState, mSupplicantStartedState);
                    addState(mConnectModeState, mSupplicantStartedState);
                        addState(mL2ConnectedState, mConnectModeState);
                            addState(mObtainingIpState, mL2ConnectedState);
                            addState(mConnectedState, mL2ConnectedState);
                            addState(mRoamingState, mL2ConnectedState);
                        addState(mDisconnectingState, mConnectModeState);
                        addState(mDisconnectedState, mConnectModeState);
                        addState(mWpsRunningState, mConnectModeState);
                addState(mWaitForP2pDisableState, mSupplicantStartedState);
            addState(mSupplicantStoppingState, mDefaultState);
            addState(mSoftApState, mDefaultState);
        // CHECKSTYLE:ON IndentationCheck

        setInitialState(mInitialState);

        setLogRecSize(NUM_LOG_RECS_NORMAL);
        setLogOnlyTransitions(false);

        //start the state machine
        start();

        // Learn the initial state of whether the screen is on.
        // We update this field when we receive broadcasts from the system.
        handleScreenStateChanged(powerManager.isInteractive());

        mWifiMonitor.registerHandler(mInterfaceName, CMD_TARGET_BSSID, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, CMD_ASSOCIATED_BSSID, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.ANQP_DONE_EVENT, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.ASSOCIATION_REJECTION_EVENT,
                getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.AUTHENTICATION_FAILURE_EVENT,
                getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.DRIVER_HUNG_EVENT, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.GAS_QUERY_DONE_EVENT, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.GAS_QUERY_START_EVENT,
                getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.HS20_REMEDIATION_EVENT,
                getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.NETWORK_CONNECTION_EVENT,
                getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.NETWORK_DISCONNECTION_EVENT,
                getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.RX_HS20_ANQP_ICON_EVENT,
                getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.SCAN_FAILED_EVENT, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.SCAN_RESULTS_EVENT, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.SSID_REENABLED, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.SSID_TEMP_DISABLED, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.SUP_CONNECTION_EVENT, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.SUP_DISCONNECTION_EVENT,
                getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT,
                getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.SUP_REQUEST_IDENTITY, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.SUP_REQUEST_SIM_AUTH, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.WPS_FAIL_EVENT, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.WPS_OVERLAP_EVENT, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.WPS_SUCCESS_EVENT, getHandler());
        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.WPS_TIMEOUT_EVENT, getHandler());

        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);
    }

    class IpManagerCallback extends IpManager.Callback {
        @Override
        public void onPreDhcpAction() {
            sendMessage(DhcpClient.CMD_PRE_DHCP_ACTION);
        }

        @Override
        public void onPostDhcpAction() {
            sendMessage(DhcpClient.CMD_POST_DHCP_ACTION);
        }

        @Override
        public void onNewDhcpResults(DhcpResults dhcpResults) {
            if (dhcpResults != null) {
                sendMessage(CMD_IPV4_PROVISIONING_SUCCESS, dhcpResults);
            } else {
                sendMessage(CMD_IPV4_PROVISIONING_FAILURE);
                mWifiInjector.getWifiLastResortWatchdog().noteConnectionFailureAndTriggerIfNeeded(
                        getTargetSsid(), mTargetRoamBSSID,
                        WifiLastResortWatchdog.FAILURE_CODE_DHCP);
            }
        }

        @Override
        public void onProvisioningSuccess(LinkProperties newLp) {
            sendMessage(CMD_UPDATE_LINKPROPERTIES, newLp);
            sendMessage(CMD_IP_CONFIGURATION_SUCCESSFUL);
        }

        @Override
        public void onProvisioningFailure(LinkProperties newLp) {
            sendMessage(CMD_IP_CONFIGURATION_LOST);
        }

        @Override
        public void onLinkPropertiesChange(LinkProperties newLp) {
            sendMessage(CMD_UPDATE_LINKPROPERTIES, newLp);
        }

        @Override
        public void onReachabilityLost(String logMsg) {
            sendMessage(CMD_IP_REACHABILITY_LOST, logMsg);
        }

        @Override
        public void installPacketFilter(byte[] filter) {
            sendMessage(CMD_INSTALL_PACKET_FILTER, filter);
        }

        @Override
        public void setFallbackMulticastFilter(boolean enabled) {
            sendMessage(CMD_SET_FALLBACK_PACKET_FILTERING, enabled);
        }

        @Override
        public void setNeighborDiscoveryOffload(boolean enabled) {
            sendMessage(CMD_CONFIG_ND_OFFLOAD, (enabled ? 1 : 0));
        }
    }

    private void stopIpManager() {
        /* Restore power save and suspend optimizations */
        handlePostDhcpSetup();
        mIpManager.stop();
    }

    PendingIntent getPrivateBroadcast(String action, int requestCode) {
        Intent intent = new Intent(action, null);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
        intent.setPackage("android");
        return mFacade.getBroadcast(mContext, requestCode, intent, 0);
    }

    /**
     * Set wpa_supplicant log level using |mVerboseLoggingLevel| flag.
     */
    void setSupplicantLogLevel() {
        mWifiNative.setSupplicantLogLevel(mVerboseLoggingEnabled);
    }

    /**
     * Method to update logging level in wifi service related classes.
     *
     * @param verbose int logging level to use
     */
    public void enableVerboseLogging(int verbose) {
        if (verbose > 0) {
            mVerboseLoggingEnabled = true;
            setLogRecSize(ActivityManager.isLowRamDeviceStatic()
                    ? NUM_LOG_RECS_VERBOSE_LOW_MEMORY : NUM_LOG_RECS_VERBOSE);
        } else {
            mVerboseLoggingEnabled = false;
            setLogRecSize(NUM_LOG_RECS_NORMAL);
        }
        configureVerboseHalLogging(mVerboseLoggingEnabled);
        setSupplicantLogLevel();
        mCountryCode.enableVerboseLogging(verbose);
        mWifiScoreReport.enableVerboseLogging(mVerboseLoggingEnabled);
        mWifiDiagnostics.startLogging(mVerboseLoggingEnabled);
        mWifiMonitor.enableVerboseLogging(verbose);
        mWifiNative.enableVerboseLogging(verbose);
        mWifiConfigManager.enableVerboseLogging(verbose);
        mSupplicantStateTracker.enableVerboseLogging(verbose);
    }

    private static final String SYSTEM_PROPERTY_LOG_CONTROL_WIFIHAL = "log.tag.WifiHAL";
    private static final String LOGD_LEVEL_DEBUG = "D";
    private static final String LOGD_LEVEL_VERBOSE = "V";
    private void configureVerboseHalLogging(boolean enableVerbose) {
        if (mBuildProperties.isUserBuild()) {  // Verbose HAL logging not supported on user builds.
            return;
        }
        mPropertyService.set(SYSTEM_PROPERTY_LOG_CONTROL_WIFIHAL,
                enableVerbose ? LOGD_LEVEL_VERBOSE : LOGD_LEVEL_DEBUG);
    }

    private int mAggressiveHandover = 0;

    int getAggressiveHandover() {
        return mAggressiveHandover;
    }

    void enableAggressiveHandover(int enabled) {
        mAggressiveHandover = enabled;
    }

    public void clearANQPCache() {
        // TODO(b/31065385)
        // mWifiConfigManager.trimANQPCache(true);
    }

    public void setAllowScansWithTraffic(int enabled) {
        mAlwaysEnableScansWhileAssociated = enabled;
    }

    public int getAllowScansWithTraffic() {
        return mAlwaysEnableScansWhileAssociated;
    }

    /*
     * Dynamically turn on/off if switching networks while connected is allowd.
     */
    public boolean setEnableAutoJoinWhenAssociated(boolean enabled) {
        sendMessage(CMD_ENABLE_AUTOJOIN_WHEN_ASSOCIATED, enabled ? 1 : 0);
        return true;
    }

    public boolean getEnableAutoJoinWhenAssociated() {
        return mEnableAutoJoinWhenAssociated;
    }

    private boolean setRandomMacOui() {
        String oui = mContext.getResources().getString(R.string.config_wifi_random_mac_oui);
        if (TextUtils.isEmpty(oui)) {
            oui = GOOGLE_OUI;
        }
        String[] ouiParts = oui.split("-");
        byte[] ouiBytes = new byte[3];
        ouiBytes[0] = (byte) (Integer.parseInt(ouiParts[0], 16) & 0xFF);
        ouiBytes[1] = (byte) (Integer.parseInt(ouiParts[1], 16) & 0xFF);
        ouiBytes[2] = (byte) (Integer.parseInt(ouiParts[2], 16) & 0xFF);

        logd("Setting OUI to " + oui);
        return mWifiNative.setScanningMacOui(ouiBytes);
    }

    /**
     * Helper method to lookup the framework network ID of the network currently configured in
     * wpa_supplicant using the provided supplicant network ID. This is needed for translating the
     * networkID received from all {@link WifiMonitor} events.
     *
     * @param supplicantNetworkId Network ID of network in wpa_supplicant.
     * @return Corresponding Internal configured network ID
     * TODO(b/31080843): This is ugly! We need to hide this translation of networkId's. This will
     * be handled once we move all of this connection logic to wificond.
     */
    private int lookupFrameworkNetworkId(int supplicantNetworkId) {
        return mWifiNative.getFrameworkNetworkId(supplicantNetworkId);
    }

    /**
     * Initiates connection to a network specified by the user/app. This method checks if the
     * requesting app holds the WIFI_CONFIG_OVERRIDE permission.
     */
    private boolean connectToUserSelectNetwork(int netId, int uid) {
        if (!mWifiConfigManager.enableNetwork(netId, true, uid)) {
            loge("connectToUserSelectNetwork uid " + uid
                    + " did not have the permissions to enable=" + netId);
            return false;
        }
        if (!mWifiConfigManager.checkAndUpdateLastConnectUid(netId, uid)) {
            logi("connectToUserSelectNetwork Allowing uid " + uid
                    + " with insufficient permissions to connect=" + netId);
        }
        // Trigger an immediate connection to the specified network. We're also noting the user
        // connect choice here, so that it will be considered in the next network selection.
        mWifiConnectivityManager.setUserConnectChoice(netId);
        if (mWifiInfo.getNetworkId() == netId) {
            // We're already connected to the user specified network, don't trigger a
            // reconnection.
            logi("connectToUserSelectNetwork already connecting/connected=" + netId);
        } else {
            startConnectToNetwork(netId, SUPPLICANT_BSSID_ANY);
        }
        return true;
    }

    /**
     * ******************************************************
     * 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.
     * @param settings   Scan settings, see {@link ScanSettings}.
     */
    public void startScan(int callingUid, int scanCounter,
                          ScanSettings settings, WorkSource workSource) {
        Bundle bundle = new Bundle();
        bundle.putParcelable(CUSTOMIZED_SCAN_SETTING, settings);
        bundle.putParcelable(CUSTOMIZED_SCAN_WORKSOURCE, workSource);
        bundle.putLong(SCAN_REQUEST_TIME, mClock.getWallClockMillis());
        sendMessage(CMD_START_SCAN, callingUid, scanCounter, bundle);
    }

    private long mDisconnectedTimeStamp = 0;

    public long getDisconnectedTimeMilli() {
        if (getCurrentState() == mDisconnectedState
                && mDisconnectedTimeStamp != 0) {
            long now_ms = mClock.getWallClockMillis();
            return now_ms - mDisconnectedTimeStamp;
        }
        return 0;
    }

    // Last connect attempt is used to prevent scan requests:
    //  - for a period of 10 seconds after attempting to connect
    private long lastConnectAttemptTimestamp = 0;
    private Set<Integer> lastScanFreqs = null;

    // For debugging, keep track of last message status handling
    // TODO, find an equivalent mechanism as part of parent class
    private static final int MESSAGE_HANDLING_STATUS_PROCESSED = 2;
    private static final int MESSAGE_HANDLING_STATUS_OK = 1;
    private static final int MESSAGE_HANDLING_STATUS_UNKNOWN = 0;
    private static final int MESSAGE_HANDLING_STATUS_REFUSED = -1;
    private static final int MESSAGE_HANDLING_STATUS_FAIL = -2;
    private static final int MESSAGE_HANDLING_STATUS_OBSOLETE = -3;
    private static final int MESSAGE_HANDLING_STATUS_DEFERRED = -4;
    private static final int MESSAGE_HANDLING_STATUS_DISCARD = -5;
    private static final int MESSAGE_HANDLING_STATUS_LOOPED = -6;
    private static final int MESSAGE_HANDLING_STATUS_HANDLING_ERROR = -7;

    private int messageHandlingStatus = 0;

    //TODO: this is used only to track connection attempts, however the link state and packet per
    //TODO: second logic should be folded into that
    private boolean checkOrDeferScanAllowed(Message msg) {
        long now = mClock.getWallClockMillis();
        if (lastConnectAttemptTimestamp != 0 && (now - lastConnectAttemptTimestamp) < 10000) {
            Message dmsg = Message.obtain(msg);
            sendMessageDelayed(dmsg, 11000 - (now - lastConnectAttemptTimestamp));
            return false;
        }
        return true;
    }

    private int mOnTime = 0;
    private int mTxTime = 0;
    private int mRxTime = 0;

    private int mOnTimeScreenStateChange = 0;
    private long lastOntimeReportTimeStamp = 0;
    private long lastScreenStateChangeTimeStamp = 0;
    private int mOnTimeLastReport = 0;
    private int mTxTimeLastReport = 0;
    private int mRxTimeLastReport = 0;

    private long lastLinkLayerStatsUpdate = 0;

    String reportOnTime() {
        long now = mClock.getWallClockMillis();
        StringBuilder sb = new StringBuilder();
        // Report stats since last report
        int on = mOnTime - mOnTimeLastReport;
        mOnTimeLastReport = mOnTime;
        int tx = mTxTime - mTxTimeLastReport;
        mTxTimeLastReport = mTxTime;
        int rx = mRxTime - mRxTimeLastReport;
        mRxTimeLastReport = mRxTime;
        int period = (int) (now - lastOntimeReportTimeStamp);
        lastOntimeReportTimeStamp = now;
        sb.append(String.format("[on:%d tx:%d rx:%d period:%d]", on, tx, rx, period));
        // Report stats since Screen State Changed
        on = mOnTime - mOnTimeScreenStateChange;
        period = (int) (now - lastScreenStateChangeTimeStamp);
        sb.append(String.format(" from screen [on:%d period:%d]", on, period));
        return sb.toString();
    }

    WifiLinkLayerStats getWifiLinkLayerStats() {
        WifiLinkLayerStats stats = null;
        if (mWifiLinkLayerStatsSupported > 0) {
            String name = "wlan0";
            stats = mWifiNative.getWifiLinkLayerStats(name);
            if (name != null && stats == null && mWifiLinkLayerStatsSupported > 0) {
                mWifiLinkLayerStatsSupported -= 1;
            } else if (stats != null) {
                lastLinkLayerStatsUpdate = mClock.getWallClockMillis();
                mOnTime = stats.on_time;
                mTxTime = stats.tx_time;
                mRxTime = stats.rx_time;
                mRunningBeaconCount = stats.beacon_rx;
            }
        }
        if (stats == null || mWifiLinkLayerStatsSupported <= 0) {
            long mTxPkts = mFacade.getTxPackets(mInterfaceName);
            long mRxPkts = mFacade.getRxPackets(mInterfaceName);
            mWifiInfo.updatePacketRates(mTxPkts, mRxPkts);
        } else {
            mWifiInfo.updatePacketRates(stats, lastLinkLayerStatsUpdate);
        }
        return stats;
    }

    int startWifiIPPacketOffload(int slot, KeepalivePacketData packetData, int intervalSeconds) {
        int ret = mWifiNative.startSendingOffloadedPacket(slot, packetData, intervalSeconds * 1000);
        if (ret != 0) {
            loge("startWifiIPPacketOffload(" + slot + ", " + intervalSeconds +
                    "): hardware error " + ret);
            return ConnectivityManager.PacketKeepalive.ERROR_HARDWARE_ERROR;
        } else {
            return ConnectivityManager.PacketKeepalive.SUCCESS;
        }
    }

    int stopWifiIPPacketOffload(int slot) {
        int ret = mWifiNative.stopSendingOffloadedPacket(slot);
        if (ret != 0) {
            loge("stopWifiIPPacketOffload(" + slot + "): hardware error " + ret);
            return ConnectivityManager.PacketKeepalive.ERROR_HARDWARE_ERROR;
        } else {
            return ConnectivityManager.PacketKeepalive.SUCCESS;
        }
    }

    int startRssiMonitoringOffload(byte maxRssi, byte minRssi) {
        return mWifiNative.startRssiMonitoring(maxRssi, minRssi, WifiStateMachine.this);
    }

    int stopRssiMonitoringOffload() {
        return mWifiNative.stopRssiMonitoring();
    }

    private void handleScanRequest(Message message) {
        ScanSettings settings = null;
        WorkSource workSource = null;

        // unbundle parameters
        Bundle bundle = (Bundle) message.obj;

        if (bundle != null) {
            settings = bundle.getParcelable(CUSTOMIZED_SCAN_SETTING);
            workSource = bundle.getParcelable(CUSTOMIZED_SCAN_WORKSOURCE);
        }

        Set<Integer> freqs = null;
        if (settings != null && settings.channelSet != null) {
            freqs = new HashSet<>();
            for (WifiChannel channel : settings.channelSet) {
                freqs.add(channel.freqMHz);
            }
        }

        // Retrieve the list of hidden network SSIDs to scan for.
        List<WifiScanner.ScanSettings.HiddenNetwork> hiddenNetworks =
                mWifiConfigManager.retrieveHiddenNetworkList();

        // call wifi native to start the scan
        if (startScanNative(freqs, hiddenNetworks, workSource)) {
            // a full scan covers everything, clearing scan request buffer
            if (freqs == null)
                mBufferedScanMsg.clear();
            messageHandlingStatus = MESSAGE_HANDLING_STATUS_OK;
            return;
        }

        // if reach here, scan request is rejected

        if (!mIsScanOngoing) {
            // if rejection is NOT due to ongoing scan (e.g. bad scan parameters),

            // discard this request and pop up the next one
            if (mBufferedScanMsg.size() > 0) {
                sendMessage(mBufferedScanMsg.remove());
            }
            messageHandlingStatus = MESSAGE_HANDLING_STATUS_DISCARD;
        } else if (!mIsFullScanOngoing) {
            // if rejection is due to an ongoing scan, and the ongoing one is NOT a full scan,
            // buffer the scan request to make sure specified channels will be scanned eventually
            if (freqs == null)
                mBufferedScanMsg.clear();
            if (mBufferedScanMsg.size() < SCAN_REQUEST_BUFFER_MAX_SIZE) {
                Message msg = obtainMessage(CMD_START_SCAN,
                        message.arg1, message.arg2, bundle);
                mBufferedScanMsg.add(msg);
            } else {
                // if too many requests in buffer, combine them into a single full scan
                bundle = new Bundle();
                bundle.putParcelable(CUSTOMIZED_SCAN_SETTING, null);
                bundle.putParcelable(CUSTOMIZED_SCAN_WORKSOURCE, workSource);
                Message msg = obtainMessage(CMD_START_SCAN, message.arg1, message.arg2, bundle);
                mBufferedScanMsg.clear();
                mBufferedScanMsg.add(msg);
            }
            messageHandlingStatus = MESSAGE_HANDLING_STATUS_LOOPED;
        } else {
            // mIsScanOngoing and mIsFullScanOngoing
            messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
        }
    }


    // TODO this is a temporary measure to bridge between WifiScanner and WifiStateMachine until
    // scan functionality is refactored out of WifiStateMachine.
    /**
     * return true iff scan request is accepted
     */
    private boolean startScanNative(final Set<Integer> freqs,
            List<WifiScanner.ScanSettings.HiddenNetwork> hiddenNetworkList,
            WorkSource workSource) {
        WifiScanner.ScanSettings settings = new WifiScanner.ScanSettings();
        if (freqs == null) {
            settings.band = WifiScanner.WIFI_BAND_BOTH_WITH_DFS;
        } else {
            settings.band = WifiScanner.WIFI_BAND_UNSPECIFIED;
            int index = 0;
            settings.channels = new WifiScanner.ChannelSpec[freqs.size()];
            for (Integer freq : freqs) {
                settings.channels[index++] = new WifiScanner.ChannelSpec(freq);
            }
        }
        settings.reportEvents = WifiScanner.REPORT_EVENT_AFTER_EACH_SCAN
                | WifiScanner.REPORT_EVENT_FULL_SCAN_RESULT;

        settings.hiddenNetworks =
                hiddenNetworkList.toArray(
                        new WifiScanner.ScanSettings.HiddenNetwork[hiddenNetworkList.size()]);

        WifiScanner.ScanListener nativeScanListener = new WifiScanner.ScanListener() {
                // ignore all events since WifiStateMachine is registered for the supplicant events
                @Override
                public void onSuccess() {
                }
                @Override
                public void onFailure(int reason, String description) {
                    mIsScanOngoing = false;
                    mIsFullScanOngoing = false;
                }
                @Override
                public void onResults(WifiScanner.ScanData[] results) {
                }
                @Override
                public void onFullResult(ScanResult fullScanResult) {
                }
                @Override
                public void onPeriodChanged(int periodInMs) {
                }
            };
        mWifiScanner.startScan(settings, nativeScanListener, workSource);
        mIsScanOngoing = true;
        mIsFullScanOngoing = (freqs == null);
        lastScanFreqs = freqs;
        return 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) {
        mWifiApConfigStore.setApConfiguration(config);
    }

    public WifiConfiguration syncGetWifiApConfiguration() {
        return mWifiApConfigStore.getApConfiguration();
    }

    /**
     * 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]";
        }
    }

    public boolean isConnected() {
        return getCurrentState() == mConnectedState;
    }

    public boolean isDisconnected() {
        return getCurrentState() == mDisconnectedState;
    }

    public boolean isSupplicantTransientState() {
        SupplicantState supplicantState = mWifiInfo.getSupplicantState();
        if (supplicantState == SupplicantState.ASSOCIATING
                || supplicantState == SupplicantState.AUTHENTICATING
                || supplicantState == SupplicantState.FOUR_WAY_HANDSHAKE
                || supplicantState == SupplicantState.GROUP_HANDSHAKE) {

            if (mVerboseLoggingEnabled) {
                Log.d(TAG, "Supplicant is under transient state: " + supplicantState);
            }
            return true;
        } else {
            if (mVerboseLoggingEnabled) {
                Log.d(TAG, "Supplicant is under steady state: " + supplicantState);
            }
        }

        return false;
    }

    public boolean isLinkDebouncing() {
        return mIsLinkDebouncing;
    }

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

    public WifiInfo getWifiInfo() {
        return mWifiInfo;
    }

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

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

    /**
     * Allow tests to confirm the operational mode for WSM.
     */
    @VisibleForTesting
    protected int getOperationalModeForTest() {
        return mOperationalMode;
    }

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

    public boolean syncQueryPasspointIcon(AsyncChannel channel, long bssid, String fileName) {
        Bundle bundle = new Bundle();
        bundle.putLong(EXTRA_OSU_ICON_QUERY_BSSID, bssid);
        bundle.putString(EXTRA_OSU_ICON_QUERY_FILENAME, fileName);
        Message resultMsg = channel.sendMessageSynchronously(CMD_QUERY_OSU_ICON, bundle);
        int result = resultMsg.arg1;
        resultMsg.recycle();
        return result == 1;
    }

    public int matchProviderWithCurrentNetwork(AsyncChannel channel, String fqdn) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_MATCH_PROVIDER_NETWORK, fqdn);
        int result = resultMsg.arg1;
        resultMsg.recycle();
        return result;
    }

    /**
     * Deauthenticate and set the re-authentication hold off time for the current network
     * @param holdoff hold off time in milliseconds
     * @param ess set if the hold off pertains to an ESS rather than a BSS
     */
    public void deauthenticateNetwork(AsyncChannel channel, long holdoff, boolean ess) {
        // TODO: This needs an implementation
    }

    public void disableEphemeralNetwork(String SSID) {
        if (SSID != null) {
            sendMessage(CMD_DISABLE_EPHEMERAL_NETWORK, SSID);
        }
    }

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

    public void disconnectCommand(int uid, int reason) {
        sendMessage(CMD_DISCONNECT, uid, reason);
    }

    /**
     * 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;
    }

    /**
     * Get configured networks synchronously
     *
     * @param channel
     * @return
     */

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

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

    public WifiConfiguration syncGetMatchingWifiConfig(ScanResult scanResult, AsyncChannel channel) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_GET_MATCHING_CONFIG, scanResult);
        return (WifiConfiguration) resultMsg.obj;
    }

    /**
     * Get connection statistics synchronously
     *
     * @param channel
     * @return
     */

    public WifiConnectionStatistics syncGetConnectionStatistics(AsyncChannel channel) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_GET_CONNECTION_STATISTICS);
        WifiConnectionStatistics result = (WifiConnectionStatistics) resultMsg.obj;
        resultMsg.recycle();
        return result;
    }

    /**
     * Get adaptors synchronously
     */

    public int syncGetSupportedFeatures(AsyncChannel channel) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_GET_SUPPORTED_FEATURES);
        int supportedFeatureSet = resultMsg.arg1;
        resultMsg.recycle();

        // Mask the feature set against system properties.
        boolean disableRtt = mPropertyService.getBoolean("config.disable_rtt", false);
        if (disableRtt) {
            supportedFeatureSet &=
                    ~(WifiManager.WIFI_FEATURE_D2D_RTT | WifiManager.WIFI_FEATURE_D2AP_RTT);
        }

        return supportedFeatureSet;
    }

    /**
     * Get link layers stats for adapter synchronously
     */
    public WifiLinkLayerStats syncGetLinkLayerStats(AsyncChannel channel) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_GET_LINK_LAYER_STATS);
        WifiLinkLayerStats result = (WifiLinkLayerStats) 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;
    }

    /**
     * Retrieves a WPS-NFC configuration token for the specified network
     *
     * @return a hex string representation of the WPS-NFC configuration token
     */
    public String syncGetWpsNfcConfigurationToken(int netId) {
        return mWifiNative.getNfcWpsConfigurationToken(netId);
    }

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

    /**
     * Start filtering Multicast v4 packets
     */
    public void startFilteringMulticastPackets() {
        mIpManager.setMulticastFilter(true);
    }

    /**
     * Stop filtering Multicast v4 packets
     */
    public void stopFilteringMulticastPackets() {
        mIpManager.setMulticastFilter(false);
    }

    /**
     * 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);
    }


    /**
     * reset cached SIM credential data
     */
    public synchronized void resetSimAuthNetworks(boolean simPresent) {
        sendMessage(CMD_RESET_SIM_NETWORKS, simPresent ? 1 : 0);
    }

    /**
     * Get Network object of current wifi network
     * @return Network object of current wifi network
     */
    public Network getCurrentNetwork() {
        if (mNetworkAgent != null) {
            return new Network(mNetworkAgent.netId);
        } else {
            return null;
        }
    }

    /**
     * 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);
    }

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

    /**
     * Send a message indicating a package has been uninstalled.
     */
    public void removeAppConfigs(String packageName, int uid) {
        // Build partial AppInfo manually - package may not exist in database any more
        ApplicationInfo ai = new ApplicationInfo();
        ai.packageName = packageName;
        ai.uid = uid;
        sendMessage(CMD_REMOVE_APP_CONFIGURATIONS, ai);
    }

    /**
     * Send a message indicating a user has been removed.
     */
    public void removeUserConfigs(int userId) {
        sendMessage(CMD_REMOVE_USER_CONFIGURATIONS, userId);
    }

    /**
     * Save configuration on supplicant
     *
     * @return {@code true} if the operation succeeds, {@code false} otherwise
     * <p/>
     * 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) {
            }
        }
    }

    public void dumpIpManager(FileDescriptor fd, PrintWriter pw, String[] args) {
        mIpManager.dump(fd, pw, args);
    }

    @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("mOperationalMode " + mOperationalMode);
        pw.println("mUserWantsSuspendOpt " + mUserWantsSuspendOpt);
        pw.println("mSuspendOptNeedsDisabled " + mSuspendOptNeedsDisabled);
        pw.println("mSystemSupportsFastBssTransition "
                + mWifiNative.getSystemSupportsFastBssTransition());
        if (mCountryCode.getCountryCodeSentToDriver() != null) {
            pw.println("CountryCode sent to driver " + mCountryCode.getCountryCodeSentToDriver());
        } else {
            if (mCountryCode.getCountryCode() != null) {
                pw.println("CountryCode: " +
                        mCountryCode.getCountryCode() + " was not sent to driver");
            } else {
                pw.println("CountryCode was not initialized");
            }
        }
        if (mNetworkFactory != null) {
            mNetworkFactory.dump(fd, pw, args);
        } else {
            pw.println("mNetworkFactory is not initialized");
        }

        if (mUntrustedNetworkFactory != null) {
            mUntrustedNetworkFactory.dump(fd, pw, args);
        } else {
            pw.println("mUntrustedNetworkFactory is not initialized");
        }
        pw.println("Wlan Wake Reasons:" + mWifiNative.getWlanWakeReasonCount());
        pw.println();

        mWifiConfigManager.dump(fd, pw, args);
        pw.println();
        mWifiDiagnostics.captureBugReportData(WifiDiagnostics.REPORT_REASON_USER_ACTION);
        mWifiDiagnostics.dump(fd, pw, args);
        dumpIpManager(fd, pw, args);
        mWifiNetworkSelector.dump(fd, pw, args);
    }

    public void handleUserSwitch(int userId) {
        sendMessage(CMD_USER_SWITCH, userId);
    }

    public void handleUserUnlock(int userId) {
        sendMessage(CMD_USER_UNLOCK, userId);
    }

    public void handleUserStop(int userId) {
        sendMessage(CMD_USER_STOP, userId);
    }

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

    private void logStateAndMessage(Message message, State state) {
        messageHandlingStatus = 0;
        if (mVerboseLoggingEnabled) {
            logd(" " + state.getClass().getSimpleName() + " " + getLogRecString(message));
        }
    }

    /**
     * Return the additional string to be logged by LogRec, default
     *
     * @param msg that was processed
     * @return information to be logged as a String
     */
    @Override
    protected String getLogRecString(Message msg) {
        WifiConfiguration config;
        Long now;
        String report;
        String key;
        StringBuilder sb = new StringBuilder();
        if (mScreenOn) {
            sb.append("!");
        }
        if (messageHandlingStatus != MESSAGE_HANDLING_STATUS_UNKNOWN) {
            sb.append("(").append(messageHandlingStatus).append(")");
        }
        sb.append(smToString(msg));
        if (msg.sendingUid > 0 && msg.sendingUid != Process.WIFI_UID) {
            sb.append(" uid=" + msg.sendingUid);
        }
        sb.append(" rt=").append(mClock.getUptimeSinceBootMillis());
        sb.append("/").append(mClock.getElapsedSinceBootMillis());
        switch (msg.what) {
            case CMD_START_SCAN:
                now = mClock.getWallClockMillis();
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                sb.append(" ic=");
                sb.append(Integer.toString(sScanAlarmIntentCount));
                if (msg.obj != null) {
                    Bundle bundle = (Bundle) msg.obj;
                    Long request = bundle.getLong(SCAN_REQUEST_TIME, 0);
                    if (request != 0) {
                        sb.append(" proc(ms):").append(now - request);
                    }
                }
                if (mIsScanOngoing) sb.append(" onGoing");
                if (mIsFullScanOngoing) sb.append(" full");
                sb.append(" rssi=").append(mWifiInfo.getRssi());
                sb.append(" f=").append(mWifiInfo.getFrequency());
                sb.append(" sc=").append(mWifiInfo.score);
                sb.append(" link=").append(mWifiInfo.getLinkSpeed());
                sb.append(String.format(" tx=%.1f,", mWifiInfo.txSuccessRate));
                sb.append(String.format(" %.1f,", mWifiInfo.txRetriesRate));
                sb.append(String.format(" %.1f ", mWifiInfo.txBadRate));
                sb.append(String.format(" rx=%.1f", mWifiInfo.rxSuccessRate));
                if (lastScanFreqs != null) {
                    sb.append(" list=");
                    for(int freq : lastScanFreqs) {
                        sb.append(freq).append(",");
                    }
                }
                report = reportOnTime();
                if (report != null) {
                    sb.append(" ").append(report);
                }
                break;
            case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                StateChangeResult stateChangeResult = (StateChangeResult) msg.obj;
                if (stateChangeResult != null) {
                    sb.append(stateChangeResult.toString());
                }
                break;
            case WifiManager.SAVE_NETWORK:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                config = (WifiConfiguration) msg.obj;
                if (config != null) {
                    sb.append(" ").append(config.configKey());
                    sb.append(" nid=").append(config.networkId);
                    if (config.hiddenSSID) {
                        sb.append(" hidden");
                    }
                    if (config.preSharedKey != null
                            && !config.preSharedKey.equals("*")) {
                        sb.append(" hasPSK");
                    }
                    if (config.ephemeral) {
                        sb.append(" ephemeral");
                    }
                    if (config.selfAdded) {
                        sb.append(" selfAdded");
                    }
                    sb.append(" cuid=").append(config.creatorUid);
                    sb.append(" suid=").append(config.lastUpdateUid);
                }
                break;
            case WifiManager.FORGET_NETWORK:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                config = (WifiConfiguration) msg.obj;
                if (config != null) {
                    sb.append(" ").append(config.configKey());
                    sb.append(" nid=").append(config.networkId);
                    if (config.hiddenSSID) {
                        sb.append(" hidden");
                    }
                    if (config.preSharedKey != null) {
                        sb.append(" hasPSK");
                    }
                    if (config.ephemeral) {
                        sb.append(" ephemeral");
                    }
                    if (config.selfAdded) {
                        sb.append(" selfAdded");
                    }
                    sb.append(" cuid=").append(config.creatorUid);
                    sb.append(" suid=").append(config.lastUpdateUid);
                    WifiConfiguration.NetworkSelectionStatus netWorkSelectionStatus =
                            config.getNetworkSelectionStatus();
                    sb.append(" ajst=").append(
                            netWorkSelectionStatus.getNetworkStatusString());
                }
                break;
            case WifiMonitor.ASSOCIATION_REJECTION_EVENT:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                String bssid = (String) msg.obj;
                if (bssid != null && bssid.length() > 0) {
                    sb.append(" ");
                    sb.append(bssid);
                }
                sb.append(" blacklist=" + Boolean.toString(didBlackListBSSID));
                break;
            case WifiMonitor.SCAN_RESULTS_EVENT:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                if (mScanResults != null) {
                    sb.append(" found=");
                    sb.append(mScanResults.size());
                }
                sb.append(" known=").append(mNumScanResultsKnown);
                sb.append(" got=").append(mNumScanResultsReturned);
                sb.append(String.format(" bcn=%d", mRunningBeaconCount));
                sb.append(String.format(" con=%d", mConnectionReqCount));
                sb.append(String.format(" untrustedcn=%d", mUntrustedReqCount));
                key = mWifiConfigManager.getLastSelectedNetworkConfigKey();
                if (key != null) {
                    sb.append(" last=").append(key);
                }
                break;
            case WifiMonitor.SCAN_FAILED_EVENT:
                break;
            case WifiMonitor.NETWORK_CONNECTION_EVENT:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                sb.append(" ").append(mLastBssid);
                sb.append(" nid=").append(mLastNetworkId);
                config = getCurrentWifiConfiguration();
                if (config != null) {
                    sb.append(" ").append(config.configKey());
                }
                key = mWifiConfigManager.getLastSelectedNetworkConfigKey();
                if (key != null) {
                    sb.append(" last=").append(key);
                }
                break;
            case CMD_TARGET_BSSID:
            case CMD_ASSOCIATED_BSSID:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                if (msg.obj != null) {
                    sb.append(" BSSID=").append((String) msg.obj);
                }
                if (mTargetRoamBSSID != null) {
                    sb.append(" Target=").append(mTargetRoamBSSID);
                }
                sb.append(" roam=").append(Boolean.toString(mAutoRoaming));
                break;
            case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                if (msg.obj != null) {
                    sb.append(" ").append((String) msg.obj);
                }
                sb.append(" nid=").append(msg.arg1);
                sb.append(" reason=").append(msg.arg2);
                if (mLastBssid != null) {
                    sb.append(" lastbssid=").append(mLastBssid);
                }
                if (mWifiInfo.getFrequency() != -1) {
                    sb.append(" freq=").append(mWifiInfo.getFrequency());
                    sb.append(" rssi=").append(mWifiInfo.getRssi());
                }
                if (isLinkDebouncing()) {
                    sb.append(" debounce");
                }
                break;
            case WifiMonitor.SSID_TEMP_DISABLED:
            case WifiMonitor.SSID_REENABLED:
                sb.append(" nid=").append(msg.arg1);
                if (msg.obj != null) {
                    sb.append(" ").append((String) msg.obj);
                }
                config = getCurrentWifiConfiguration();
                if (config != null) {
                    WifiConfiguration.NetworkSelectionStatus netWorkSelectionStatus =
                            config.getNetworkSelectionStatus();
                    sb.append(" cur=").append(config.configKey());
                    sb.append(" ajst=").append(netWorkSelectionStatus.getNetworkStatusString());
                    if (config.selfAdded) {
                        sb.append(" selfAdded");
                    }
                    if (config.status != 0) {
                        sb.append(" st=").append(config.status);
                        sb.append(" rs=").append(
                                netWorkSelectionStatus.getNetworkDisableReasonString());
                    }
                    if (config.lastConnected != 0) {
                        now = mClock.getWallClockMillis();
                        sb.append(" lastconn=").append(now - config.lastConnected).append("(ms)");
                    }
                    if (mLastBssid != null) {
                        sb.append(" lastbssid=").append(mLastBssid);
                    }
                    if (mWifiInfo.getFrequency() != -1) {
                        sb.append(" freq=").append(mWifiInfo.getFrequency());
                        sb.append(" rssi=").append(mWifiInfo.getRssi());
                        sb.append(" bssid=").append(mWifiInfo.getBSSID());
                    }
                }
                break;
            case CMD_RSSI_POLL:
            case CMD_UNWANTED_NETWORK:
            case WifiManager.RSSI_PKTCNT_FETCH:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                if (mWifiInfo.getSSID() != null)
                    if (mWifiInfo.getSSID() != null)
                        sb.append(" ").append(mWifiInfo.getSSID());
                if (mWifiInfo.getBSSID() != null)
                    sb.append(" ").append(mWifiInfo.getBSSID());
                sb.append(" rssi=").append(mWifiInfo.getRssi());
                sb.append(" f=").append(mWifiInfo.getFrequency());
                sb.append(" sc=").append(mWifiInfo.score);
                sb.append(" link=").append(mWifiInfo.getLinkSpeed());
                sb.append(String.format(" tx=%.1f,", mWifiInfo.txSuccessRate));
                sb.append(String.format(" %.1f,", mWifiInfo.txRetriesRate));
                sb.append(String.format(" %.1f ", mWifiInfo.txBadRate));
                sb.append(String.format(" rx=%.1f", mWifiInfo.rxSuccessRate));
                sb.append(String.format(" bcn=%d", mRunningBeaconCount));
                report = reportOnTime();
                if (report != null) {
                    sb.append(" ").append(report);
                }
                if (mWifiScoreReport.isLastReportValid()) {
                    sb.append(mWifiScoreReport.getLastReport());
                }
                break;
            case CMD_START_CONNECT:
            case WifiManager.CONNECT_NETWORK:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                config = mWifiConfigManager.getConfiguredNetwork(msg.arg1);
                if (config != null) {
                    sb.append(" ").append(config.configKey());
                    if (config.visibility != null) {
                        sb.append(" ").append(config.visibility.toString());
                    }
                }
                if (mTargetRoamBSSID != null) {
                    sb.append(" ").append(mTargetRoamBSSID);
                }
                sb.append(" roam=").append(Boolean.toString(mAutoRoaming));
                config = getCurrentWifiConfiguration();
                if (config != null) {
                    sb.append(config.configKey());
                    if (config.visibility != null) {
                        sb.append(" ").append(config.visibility.toString());
                    }
                }
                break;
            case CMD_START_ROAM:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                ScanResult result = (ScanResult) msg.obj;
                if (result != null) {
                    now = mClock.getWallClockMillis();
                    sb.append(" bssid=").append(result.BSSID);
                    sb.append(" rssi=").append(result.level);
                    sb.append(" freq=").append(result.frequency);
                    if (result.seen > 0 && result.seen < now) {
                        sb.append(" seen=").append(now - result.seen);
                    } else {
                        // Somehow the timestamp for this scan result is inconsistent
                        sb.append(" !seen=").append(result.seen);
                    }
                }
                if (mTargetRoamBSSID != null) {
                    sb.append(" ").append(mTargetRoamBSSID);
                }
                sb.append(" roam=").append(Boolean.toString(mAutoRoaming));
                sb.append(" fail count=").append(Integer.toString(mRoamFailCount));
                break;
            case CMD_ADD_OR_UPDATE_NETWORK:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                if (msg.obj != null) {
                    config = (WifiConfiguration) msg.obj;
                    sb.append(" ").append(config.configKey());
                    sb.append(" prio=").append(config.priority);
                    sb.append(" status=").append(config.status);
                    if (config.BSSID != null) {
                        sb.append(" ").append(config.BSSID);
                    }
                    WifiConfiguration curConfig = getCurrentWifiConfiguration();
                    if (curConfig != null) {
                        if (curConfig.configKey().equals(config.configKey())) {
                            sb.append(" is current");
                        } else {
                            sb.append(" current=").append(curConfig.configKey());
                            sb.append(" prio=").append(curConfig.priority);
                            sb.append(" status=").append(curConfig.status);
                        }
                    }
                }
                break;
            case WifiManager.DISABLE_NETWORK:
            case CMD_ENABLE_NETWORK:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                key = mWifiConfigManager.getLastSelectedNetworkConfigKey();
                if (key != null) {
                    sb.append(" last=").append(key);
                }
                config = mWifiConfigManager.getConfiguredNetwork(msg.arg1);
                if (config != null && (key == null || !config.configKey().equals(key))) {
                    sb.append(" target=").append(key);
                }
                break;
            case CMD_GET_CONFIGURED_NETWORKS:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                sb.append(" num=").append(mWifiConfigManager.getConfiguredNetworks().size());
                break;
            case DhcpClient.CMD_PRE_DHCP_ACTION:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                sb.append(" txpkts=").append(mWifiInfo.txSuccess);
                sb.append(",").append(mWifiInfo.txBad);
                sb.append(",").append(mWifiInfo.txRetries);
                break;
            case DhcpClient.CMD_POST_DHCP_ACTION:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                if (msg.arg1 == DhcpClient.DHCP_SUCCESS) {
                    sb.append(" OK ");
                } else if (msg.arg1 == DhcpClient.DHCP_FAILURE) {
                    sb.append(" FAIL ");
                }
                if (mLinkProperties != null) {
                    sb.append(" ");
                    sb.append(getLinkPropertiesSummary(mLinkProperties));
                }
                break;
            case WifiP2pServiceImpl.P2P_CONNECTION_CHANGED:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                if (msg.obj != null) {
                    NetworkInfo info = (NetworkInfo) msg.obj;
                    NetworkInfo.State state = info.getState();
                    NetworkInfo.DetailedState detailedState = info.getDetailedState();
                    if (state != null) {
                        sb.append(" st=").append(state);
                    }
                    if (detailedState != null) {
                        sb.append("/").append(detailedState);
                    }
                }
                break;
            case CMD_IP_CONFIGURATION_LOST:
                int count = -1;
                WifiConfiguration c = getCurrentWifiConfiguration();
                if (c != null) {
                    count = c.getNetworkSelectionStatus().getDisableReasonCounter(
                            WifiConfiguration.NetworkSelectionStatus.DISABLED_DHCP_FAILURE);
                }
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                sb.append(" failures: ");
                sb.append(Integer.toString(count));
                sb.append("/");
                sb.append(Integer.toString(mFacade.getIntegerSetting(
                        mContext, Settings.Global.WIFI_MAX_DHCP_RETRY_COUNT, 0)));
                if (mWifiInfo.getBSSID() != null) {
                    sb.append(" ").append(mWifiInfo.getBSSID());
                }
                sb.append(String.format(" bcn=%d", mRunningBeaconCount));
                break;
            case CMD_UPDATE_LINKPROPERTIES:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                if (mLinkProperties != null) {
                    sb.append(" ");
                    sb.append(getLinkPropertiesSummary(mLinkProperties));
                }
                break;
            case CMD_IP_REACHABILITY_LOST:
                if (msg.obj != null) {
                    sb.append(" ").append((String) msg.obj);
                }
                break;
            case CMD_INSTALL_PACKET_FILTER:
                sb.append(" len=" + ((byte[])msg.obj).length);
                break;
            case CMD_SET_FALLBACK_PACKET_FILTERING:
                sb.append(" enabled=" + (boolean)msg.obj);
                break;
            case CMD_ROAM_WATCHDOG_TIMER:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                sb.append(" cur=").append(roamWatchdogCount);
                break;
            case CMD_DISCONNECTING_WATCHDOG_TIMER:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                sb.append(" cur=").append(disconnectingWatchdogCount);
                break;
            case CMD_START_RSSI_MONITORING_OFFLOAD:
            case CMD_STOP_RSSI_MONITORING_OFFLOAD:
            case CMD_RSSI_THRESHOLD_BREACH:
                sb.append(" rssi=");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" thresholds=");
                sb.append(Arrays.toString(mRssiRanges));
                break;
            case CMD_USER_SWITCH:
                sb.append(" userId=");
                sb.append(Integer.toString(msg.arg1));
                break;
            case CMD_IPV4_PROVISIONING_SUCCESS:
                sb.append(" ");
                if (msg.arg1 == DhcpClient.DHCP_SUCCESS) {
                    sb.append("DHCP_OK");
                } else if (msg.arg1 == CMD_STATIC_IP_SUCCESS) {
                    sb.append("STATIC_OK");
                } else {
                    sb.append(Integer.toString(msg.arg1));
                }
                break;
            case CMD_IPV4_PROVISIONING_FAILURE:
                sb.append(" ");
                if (msg.arg1 == DhcpClient.DHCP_FAILURE) {
                    sb.append("DHCP_FAIL");
                } else if (msg.arg1 == CMD_STATIC_IP_FAILURE) {
                    sb.append("STATIC_FAIL");
                } else {
                    sb.append(Integer.toString(msg.arg1));
                }
                break;
            default:
                sb.append(" ");
                sb.append(Integer.toString(msg.arg1));
                sb.append(" ");
                sb.append(Integer.toString(msg.arg2));
                break;
        }

        return sb.toString();
    }

    private void handleScreenStateChanged(boolean screenOn) {
        mScreenOn = screenOn;
        if (mVerboseLoggingEnabled) {
            logd(" handleScreenStateChanged Enter: screenOn=" + screenOn
                    + " mUserWantsSuspendOpt=" + mUserWantsSuspendOpt
                    + " state " + getCurrentState().getName()
                    + " suppState:" + mSupplicantStateTracker.getSupplicantStateName());
        }
        enableRssiPolling(screenOn);
        if (mUserWantsSuspendOpt.get()) {
            int shouldReleaseWakeLock = 0;
            if (screenOn) {
                sendMessage(CMD_SET_SUSPEND_OPT_ENABLED, 0, shouldReleaseWakeLock);
            } else {
                if (isConnected()) {
                    // Allow 2s for suspend optimizations to be set
                    mSuspendWakeLock.acquire(2000);
                    shouldReleaseWakeLock = 1;
                }
                sendMessage(CMD_SET_SUSPEND_OPT_ENABLED, 1, shouldReleaseWakeLock);
            }
        }

        getWifiLinkLayerStats();
        mOnTimeScreenStateChange = mOnTime;
        lastScreenStateChangeTimeStamp = lastLinkLayerStatsUpdate;

        mWifiMetrics.setScreenState(screenOn);

        if (mWifiConnectivityManager != null) {
            mWifiConnectivityManager.handleScreenStateChanged(screenOn);
        }

        if (mVerboseLoggingEnabled) log("handleScreenStateChanged Exit: " + screenOn);
    }

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

    private void setSuspendOptimizationsNative(int reason, boolean enabled) {
        if (mVerboseLoggingEnabled) {
            log("setSuspendOptimizationsNative: " + reason + " " + enabled
                    + " -want " + mUserWantsSuspendOpt.get()
                    + " stack:" + Thread.currentThread().getStackTrace()[2].getMethodName()
                    + " - " + Thread.currentThread().getStackTrace()[3].getMethodName()
                    + " - " + Thread.currentThread().getStackTrace()[4].getMethodName()
                    + " - " + Thread.currentThread().getStackTrace()[5].getMethodName());
        }
        //mWifiNative.setSuspendOptimizations(enabled);

        if (enabled) {
            mSuspendOptNeedsDisabled &= ~reason;
            /* None of dhcp, screen or highperf need it disabled and user wants it enabled */
            if (mSuspendOptNeedsDisabled == 0 && mUserWantsSuspendOpt.get()) {
                if (mVerboseLoggingEnabled) {
                    log("setSuspendOptimizationsNative do it " + reason + " " + enabled
                            + " stack:" + Thread.currentThread().getStackTrace()[2].getMethodName()
                            + " - " + Thread.currentThread().getStackTrace()[3].getMethodName()
                            + " - " + Thread.currentThread().getStackTrace()[4].getMethodName()
                            + " - " + Thread.currentThread().getStackTrace()[5].getMethodName());
                }
                mWifiNative.setSuspendOptimizations(true);
            }
        } else {
            mSuspendOptNeedsDisabled |= reason;
            mWifiNative.setSuspendOptimizations(false);
        }
    }

    private void setSuspendOptimizations(int reason, boolean enabled) {
        if (mVerboseLoggingEnabled) log("setSuspendOptimizations: " + reason + " " + enabled);
        if (enabled) {
            mSuspendOptNeedsDisabled &= ~reason;
        } else {
            mSuspendOptNeedsDisabled |= reason;
        }
        if (mVerboseLoggingEnabled) 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 (mVerboseLoggingEnabled) 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, int reason) {
        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 (mVerboseLoggingEnabled) 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);
        if (wifiApState == WifiManager.WIFI_AP_STATE_FAILED) {
            //only set reason number when softAP start failed
            intent.putExtra(WifiManager.EXTRA_WIFI_AP_FAILURE_REASON, reason);
        }

        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    }

    private void setScanResults() {
        mNumScanResultsKnown = 0;
        mNumScanResultsReturned = 0;

        ArrayList<ScanDetail> scanResults = mWifiNative.getScanResults();

        if (scanResults.isEmpty()) {
            mScanResults = new ArrayList<>();
            return;
        }

        // TODO(b/31065385): mWifiConfigManager.trimANQPCache(false);

        boolean connected = mLastBssid != null;
        long activeBssid = 0L;
        if (connected) {
            try {
                activeBssid = Utils.parseMac(mLastBssid);
            } catch (IllegalArgumentException iae) {
                connected = false;
            }
        }

        synchronized (mScanResultsLock) {
            mScanResults = scanResults;
            mNumScanResultsReturned = mScanResults.size();
        }

        if (isLinkDebouncing()) {
            // If debouncing, we dont re-select a SSID or BSSID hence
            // there is no need to call the network selection code
            // in WifiAutoJoinController, instead,
            // just try to reconnect to the same SSID by triggering a roam
            // The third parameter 1 means roam not from network selection but debouncing
            sendMessage(CMD_START_ROAM, mLastNetworkId, 1, null);
        }
    }

    /*
     * Fetch RSSI, linkspeed, and frequency on current connection
     */
    private void fetchRssiLinkSpeedAndFrequencyNative() {
        Integer newRssi = null;
        Integer newLinkSpeed = null;
        Integer newFrequency = null;
        WifiNative.SignalPollResult pollResult = mWifiNative.signalPoll();
        if (pollResult == null) {
            return;
        }

        newRssi = pollResult.currentRssi;
        newLinkSpeed = pollResult.txBitrate;
        newFrequency = pollResult.associationFrequency;

        if (mVerboseLoggingEnabled) {
            logd("fetchRssiLinkSpeedAndFrequencyNative rssi=" + newRssi +
                 " linkspeed=" + newLinkSpeed + " freq=" + newFrequency);
        }

        if (newRssi != null && newRssi > WifiInfo.INVALID_RSSI && newRssi < WifiInfo.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);
            /*
             * Log the rssi poll value in metrics
             */
            mWifiMetrics.incrementRssiPollRssiCount(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) {
                updateCapabilities(getCurrentWifiConfiguration());
                sendRssiChangeBroadcast(newRssi);
            }
            mLastSignalLevel = newSignalLevel;
        } else {
            mWifiInfo.setRssi(WifiInfo.INVALID_RSSI);
            updateCapabilities(getCurrentWifiConfiguration());
        }

        if (newLinkSpeed != null) {
            mWifiInfo.setLinkSpeed(newLinkSpeed);
        }
        if (newFrequency != null && newFrequency > 0) {
            if (ScanResult.is5GHz(newFrequency)) {
                mWifiConnectionStatistics.num5GhzConnected++;
            }
            if (ScanResult.is24GHz(newFrequency)) {
                mWifiConnectionStatistics.num24GhzConnected++;
            }
            mWifiInfo.setFrequency(newFrequency);
        }
        mWifiConfigManager.updateScanDetailCacheFromWifiInfo(mWifiInfo);
    }

    // Polling has completed, hence we wont have a score anymore
    private void cleanWifiScore() {
        mWifiInfo.txBadRate = 0;
        mWifiInfo.txSuccessRate = 0;
        mWifiInfo.txRetriesRate = 0;
        mWifiInfo.rxSuccessRate = 0;
        mWifiScoreReport.reset();
    }

    private void updateLinkProperties(LinkProperties newLp) {
        if (mVerboseLoggingEnabled) {
            log("Link configuration changed for netId: " + mLastNetworkId
                    + " old: " + mLinkProperties + " new: " + newLp);
        }
        // We own this instance of LinkProperties because IpManager passes us a copy.
        mLinkProperties = newLp;
        if (mNetworkAgent != null) {
            mNetworkAgent.sendLinkProperties(mLinkProperties);
        }

        if (getNetworkDetailedState() == DetailedState.CONNECTED) {
            // If anything has changed and we're already connected, send out a notification.
            // TODO: Update all callers to use NetworkCallbacks and delete this.
            sendLinkConfigurationChangedBroadcast();
        }

        if (mVerboseLoggingEnabled) {
            StringBuilder sb = new StringBuilder();
            sb.append("updateLinkProperties nid: " + mLastNetworkId);
            sb.append(" state: " + getNetworkDetailedState());

            if (mLinkProperties != null) {
                sb.append(" ");
                sb.append(getLinkPropertiesSummary(mLinkProperties));
            }
            logd(sb.toString());
        }
    }

    /**
     * Clears all our link properties.
     */
    private void clearLinkProperties() {
        // Clear the link properties obtained from DHCP. The only caller of this
        // function has already called IpManager#stop(), which clears its state.
        synchronized (mDhcpResultsLock) {
            if (mDhcpResults != null) {
                mDhcpResults.clear();
            }
        }

        // Now clear the merged link properties.
        mLinkProperties.clear();
        if (mNetworkAgent != null) mNetworkAgent.sendLinkProperties(mLinkProperties);
    }

    /**
     * try to update default route MAC address.
     */
    private String updateDefaultRouteMacAddress(int timeout) {
        String address = null;
        for (RouteInfo route : mLinkProperties.getRoutes()) {
            if (route.isDefaultRoute() && route.hasGateway()) {
                InetAddress gateway = route.getGateway();
                if (gateway instanceof Inet4Address) {
                    if (mVerboseLoggingEnabled) {
                        logd("updateDefaultRouteMacAddress found Ipv4 default :"
                                + gateway.getHostAddress());
                    }
                    address = macAddressFromRoute(gateway.getHostAddress());
                    /* The gateway's MAC address is known */
                    if ((address == null) && (timeout > 0)) {
                        boolean reachable = false;
                        TrafficStats.setThreadStatsTag(TrafficStats.TAG_SYSTEM_PROBE);
                        try {
                            reachable = gateway.isReachable(timeout);
                        } catch (Exception e) {
                            loge("updateDefaultRouteMacAddress exception reaching :"
                                    + gateway.getHostAddress());

                        } finally {
                            TrafficStats.clearThreadStatsTag();
                            if (reachable == true) {

                                address = macAddressFromRoute(gateway.getHostAddress());
                                if (mVerboseLoggingEnabled) {
                                    logd("updateDefaultRouteMacAddress reachable (tried again) :"
                                            + gateway.getHostAddress() + " found " + address);
                                }
                            }
                        }
                    }
                    if (address != null) {
                        mWifiConfigManager.setNetworkDefaultGwMacAddress(mLastNetworkId, address);
                    }
                }
            }
        }
        return address;
    }

    private void sendRssiChangeBroadcast(final int newRssi) {
        try {
            mBatteryStats.noteWifiRssiChanged(newRssi);
        } catch (RemoteException e) {
            // Won't happen.
        }
        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) {
            // We no longer report MAC address to third-parties and our code does
            // not rely on this broadcast, so just send the default MAC address.
            fetchRssiLinkSpeedAndFrequencyNative();
            WifiInfo sentWifiInfo = new WifiInfo(mWifiInfo);
            sentWifiInfo.setMacAddress(WifiInfo.DEFAULT_MAC_ADDRESS);
            intent.putExtra(WifiManager.EXTRA_WIFI_INFO, sentWifiInfo);
        }
        mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
    }

    private WifiInfo getWiFiInfoForUid(int uid) {
        if (Binder.getCallingUid() == Process.myUid()) {
            return mWifiInfo;
        }

        WifiInfo result = new WifiInfo(mWifiInfo);
        result.setMacAddress(WifiInfo.DEFAULT_MAC_ADDRESS);

        IBinder binder = mFacade.getService("package");
        IPackageManager packageManager = IPackageManager.Stub.asInterface(binder);

        try {
            if (packageManager.checkUidPermission(Manifest.permission.LOCAL_MAC_ADDRESS,
                    uid) == PackageManager.PERMISSION_GRANTED) {
                result.setMacAddress(mWifiInfo.getMacAddress());
            }
        } catch (RemoteException e) {
            Log.e(TAG, "Error checking receiver permission", e);
        }

        return result;
    }

    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 boolean setNetworkDetailedState(NetworkInfo.DetailedState state) {
        boolean hidden = false;

        if (isLinkDebouncing() || isRoaming()) {
            // There is generally a confusion in the system about colluding
            // WiFi Layer 2 state (as reported by supplicant) and the Network state
            // which leads to multiple confusion.
            //
            // If link is de-bouncing or roaming, we already have an IP address
            // as well we were connected and are doing L2 cycles of
            // reconnecting or renewing IP address to check that we still have it
            // This L2 link flapping should ne be reflected into the Network state
            // which is the state of the WiFi Network visible to Layer 3 and applications
            // Note that once debouncing and roaming are completed, we will
            // set the Network state to where it should be, or leave it as unchanged
            //
            hidden = true;
        }
        if (mVerboseLoggingEnabled) {
            log("setDetailed state, old ="
                    + mNetworkInfo.getDetailedState() + " and new state=" + state
                    + " hidden=" + hidden);
        }
        if (mNetworkInfo.getExtraInfo() != null && mWifiInfo.getSSID() != null
                && !mWifiInfo.getSSID().equals(WifiSsid.NONE)) {
            // Always indicate that SSID has changed
            if (!mNetworkInfo.getExtraInfo().equals(mWifiInfo.getSSID())) {
                if (mVerboseLoggingEnabled) {
                    log("setDetailed state send new extra info" + mWifiInfo.getSSID());
                }
                mNetworkInfo.setExtraInfo(mWifiInfo.getSSID());
                sendNetworkStateChangeBroadcast(null);
            }
        }
        if (hidden == true) {
            return false;
        }

        if (state != mNetworkInfo.getDetailedState()) {
            mNetworkInfo.setDetailedState(state, null, mWifiInfo.getSSID());
            if (mNetworkAgent != null) {
                mNetworkAgent.sendNetworkInfo(mNetworkInfo);
            }
            sendNetworkStateChangeBroadcast(null);
            return true;
        }
        return false;
    }

    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);
        // If we receive a supplicant state change with an empty SSID,
        // this implies that wpa_supplicant is already disconnected.
        // We should pretend we are still connected when linkDebouncing is on.
        if ((stateChangeResult.wifiSsid == null
                || stateChangeResult.wifiSsid.toString().isEmpty()) && isLinkDebouncing()) {
            return state;
        }
        // Network id is only valid when we start connecting
        if (SupplicantState.isConnecting(state)) {
            mWifiInfo.setNetworkId(lookupFrameworkNetworkId(stateChangeResult.networkId));
        } else {
            mWifiInfo.setNetworkId(WifiConfiguration.INVALID_NETWORK_ID);
        }

        mWifiInfo.setBSSID(stateChangeResult.BSSID);

        mWifiInfo.setSSID(stateChangeResult.wifiSsid);
        WifiConfiguration config = getCurrentWifiConfiguration();
        if (config != null) {
            // Set meteredHint to true if the access network type of the connecting/connected AP
            // is a chargeable public network.
            ScanDetailCache scanDetailCache = mWifiConfigManager.getScanDetailCacheForNetwork(
                    config.networkId);
            if (scanDetailCache != null) {
                ScanDetail scanDetail = scanDetailCache.getScanDetail(stateChangeResult.BSSID);
                if (scanDetail != null) {
                    NetworkDetail networkDetail = scanDetail.getNetworkDetail();
                    if (networkDetail != null
                            && networkDetail.getAnt() == NetworkDetail.Ant.ChargeablePublic) {
                        mWifiInfo.setMeteredHint(true);
                    }
                }
            }

            mWifiInfo.setEphemeral(config.ephemeral);
            if (!mWifiInfo.getMeteredHint()) { // don't override the value if already set.
                mWifiInfo.setMeteredHint(config.meteredHint);
            }
        }

        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 (mVerboseLoggingEnabled) {
            log("handleNetworkDisconnect: Stopping DHCP and clearing IP"
                    + " stack:" + Thread.currentThread().getStackTrace()[2].getMethodName()
                    + " - " + Thread.currentThread().getStackTrace()[3].getMethodName()
                    + " - " + Thread.currentThread().getStackTrace()[4].getMethodName()
                    + " - " + Thread.currentThread().getStackTrace()[5].getMethodName());
        }

        stopRssiMonitoringOffload();

        clearTargetBssid("handleNetworkDisconnect");

        stopIpManager();

        /* Reset data structures */
        mWifiScoreReport.reset();
        mWifiInfo.reset();
        mIsLinkDebouncing = false;
        /* Reset roaming parameters */
        mAutoRoaming = false;

        setNetworkDetailedState(DetailedState.DISCONNECTED);
        if (mNetworkAgent != null) {
            mNetworkAgent.sendNetworkInfo(mNetworkInfo);
            mNetworkAgent = null;
        }

        /* Clear network properties */
        clearLinkProperties();

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

        mLastBssid = null;
        registerDisconnected();
        mLastNetworkId = WifiConfiguration.INVALID_NETWORK_ID;
    }

    private void handleSupplicantConnectionLoss(boolean killSupplicant) {
        /* Socket connection can be lost when we do a graceful shutdown
        * or when the driver is hung. Ensure supplicant is stopped here.
        */
        if (killSupplicant) {
            mWifiMonitor.stopAllMonitoring();
            if (!mWifiNative.disableSupplicant()) {
                loge("Failed to disable supplicant after connection loss");
            }
        }
        mWifiNative.closeSupplicantConnection();
        sendSupplicantConnectionChangedBroadcast(false);
        setWifiState(WIFI_STATE_DISABLED);
    }

    void handlePreDhcpSetup() {
        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(
                    WifiNative.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);

        // Update link layer stats
        getWifiLinkLayerStats();

        if (mWifiP2pChannel != null) {
            /* P2p discovery breaks dhcp, shut it down in order to get through this */
            Message msg = new Message();
            msg.what = WifiP2pServiceImpl.BLOCK_DISCOVERY;
            msg.arg1 = WifiP2pServiceImpl.ENABLED;
            msg.arg2 = DhcpClient.CMD_PRE_DHCP_ACTION_COMPLETE;
            msg.obj = WifiStateMachine.this;
            mWifiP2pChannel.sendMessage(msg);
        } else {
            // If the p2p service is not running, we can proceed directly.
            sendMessage(DhcpClient.CMD_PRE_DHCP_ACTION_COMPLETE);
        }
    }

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

        p2pSendMessage(WifiP2pServiceImpl.BLOCK_DISCOVERY, WifiP2pServiceImpl.DISABLED);

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

    private static final long DIAGS_CONNECT_TIMEOUT_MILLIS = 60 * 1000;
    private long mDiagsConnectionStartMillis = -1;
    /**
     * Inform other components that a new connection attempt is starting.
     */
    private void reportConnectionAttemptStart(
            WifiConfiguration config, String targetBSSID, int roamType) {
        mWifiMetrics.startConnectionEvent(config, targetBSSID, roamType);
        mDiagsConnectionStartMillis = mClock.getElapsedSinceBootMillis();
        mWifiDiagnostics.reportConnectionEvent(
                mDiagsConnectionStartMillis, WifiDiagnostics.CONNECTION_EVENT_STARTED);
        // TODO(b/35329124): Remove CMD_DIAGS_CONNECT_TIMEOUT, once WifiStateMachine
        // grows a proper CONNECTING state.
        sendMessageDelayed(CMD_DIAGS_CONNECT_TIMEOUT,
                mDiagsConnectionStartMillis, DIAGS_CONNECT_TIMEOUT_MILLIS);
    }

    /**
     * Inform other components (WifiMetrics, WifiDiagnostics, etc.) that the current connection attempt
     * has concluded.
     */
    private void reportConnectionAttemptEnd(int level2FailureCode, int connectivityFailureCode) {
        mWifiMetrics.endConnectionEvent(level2FailureCode, connectivityFailureCode);
        switch (level2FailureCode) {
            case WifiMetrics.ConnectionEvent.FAILURE_NONE:
                // Ideally, we'd wait until IP reachability has been confirmed. this code falls
                // short in two ways:
                // - at the time of the CMD_IP_CONFIGURATION_SUCCESSFUL event, we don't know if we
                //   actually have ARP reachability. it might be better to wait until the wifi
                //   network has been validated by IpManager.
                // - in the case of a roaming event (intra-SSID), we probably trigger when L2 is
                //   complete.
                //
                // TODO(b/34181219): Fix the above.
                mWifiDiagnostics.reportConnectionEvent(
                        mDiagsConnectionStartMillis, WifiDiagnostics.CONNECTION_EVENT_SUCCEEDED);
                break;
            case WifiMetrics.ConnectionEvent.FAILURE_REDUNDANT_CONNECTION_ATTEMPT:
            case WifiMetrics.ConnectionEvent.FAILURE_CONNECT_NETWORK_FAILED:
                // WifiDiagnostics doesn't care about pre-empted connections, or cases
                // where we failed to initiate a connection attempt with supplicant.
                break;
            default:
                mWifiDiagnostics.reportConnectionEvent(
                        mDiagsConnectionStartMillis, WifiDiagnostics.CONNECTION_EVENT_FAILED);
        }
        mDiagsConnectionStartMillis = -1;
    }

    private void handleIPv4Success(DhcpResults dhcpResults) {
        if (mVerboseLoggingEnabled) {
            logd("handleIPv4Success <" + dhcpResults.toString() + ">");
            logd("link address " + dhcpResults.ipAddress);
        }

        Inet4Address addr;
        synchronized (mDhcpResultsLock) {
            mDhcpResults = dhcpResults;
            addr = (Inet4Address) dhcpResults.ipAddress.getAddress();
        }

        if (isRoaming()) {
            int previousAddress = mWifiInfo.getIpAddress();
            int newAddress = NetworkUtils.inetAddressToInt(addr);
            if (previousAddress != newAddress) {
                logd("handleIPv4Success, roaming and address changed" +
                        mWifiInfo + " got: " + addr);
            }
        }
        mWifiInfo.setInetAddress(addr);
        if (!mWifiInfo.getMeteredHint()) { // don't override the value if already set.
            mWifiInfo.setMeteredHint(dhcpResults.hasMeteredHint());
            updateCapabilities(getCurrentWifiConfiguration());
        }
    }

    private void handleSuccessfulIpConfiguration() {
        mLastSignalLevel = -1; // Force update of signal strength
        WifiConfiguration c = getCurrentWifiConfiguration();
        if (c != null) {
            // Reset IP failure tracking
            c.getNetworkSelectionStatus().clearDisableReasonCounter(
                    WifiConfiguration.NetworkSelectionStatus.DISABLED_DHCP_FAILURE);

            // Tell the framework whether the newly connected network is trusted or untrusted.
            updateCapabilities(c);
        }
        if (c != null) {
            ScanResult result = getCurrentScanResult();
            if (result == null) {
                logd("WifiStateMachine: handleSuccessfulIpConfiguration and no scan results" +
                        c.configKey());
            } else {
                // Clear the per BSSID failure count
                result.numIpConfigFailures = 0;
            }
        }
    }

    private void handleIPv4Failure() {
        // TODO: Move this to provisioning failure, not DHCP failure.
        // DHCPv4 failure is expected on an IPv6-only network.
        mWifiDiagnostics.captureBugReportData(WifiDiagnostics.REPORT_REASON_DHCP_FAILURE);
        if (mVerboseLoggingEnabled) {
            int count = -1;
            WifiConfiguration config = getCurrentWifiConfiguration();
            if (config != null) {
                count = config.getNetworkSelectionStatus().getDisableReasonCounter(
                        WifiConfiguration.NetworkSelectionStatus.DISABLED_DHCP_FAILURE);
            }
            log("DHCP failure count=" + count);
        }
        reportConnectionAttemptEnd(
                WifiMetrics.ConnectionEvent.FAILURE_DHCP,
                WifiMetricsProto.ConnectionEvent.HLF_DHCP);
        synchronized(mDhcpResultsLock) {
             if (mDhcpResults != null) {
                 mDhcpResults.clear();
             }
        }
        if (mVerboseLoggingEnabled) {
            logd("handleIPv4Failure");
        }
    }

    private void handleIpConfigurationLost() {
        mWifiInfo.setInetAddress(null);
        mWifiInfo.setMeteredHint(false);

        mWifiConfigManager.updateNetworkSelectionStatus(mLastNetworkId,
                WifiConfiguration.NetworkSelectionStatus.DISABLED_DHCP_FAILURE);

        /* DHCP times out after about 30 seconds, we do a
         * disconnect thru supplicant, we will let autojoin retry connecting to the network
         */
        mWifiNative.disconnect();
    }

    // TODO: De-duplicated this and handleIpConfigurationLost().
    private void handleIpReachabilityLost() {
        mWifiInfo.setInetAddress(null);
        mWifiInfo.setMeteredHint(false);

        // TODO: Determine whether to call some form of mWifiConfigManager.handleSSIDStateChange().

        // Disconnect via supplicant, and let autojoin retry connecting to the network.
        mWifiNative.disconnect();
    }

    /*
     * Read a MAC address in /proc/arp/table, used by WifistateMachine
     * so as to record MAC address of default gateway.
     **/
    private String macAddressFromRoute(String ipAddress) {
        String macAddress = null;
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new FileReader("/proc/net/arp"));

            // Skip over the line bearing colum titles
            String line = reader.readLine();

            while ((line = reader.readLine()) != null) {
                String[] tokens = line.split("[ ]+");
                if (tokens.length < 6) {
                    continue;
                }

                // ARP column format is
                // Address HWType HWAddress Flags Mask IFace
                String ip = tokens[0];
                String mac = tokens[3];

                if (ipAddress.equals(ip)) {
                    macAddress = mac;
                    break;
                }
            }

            if (macAddress == null) {
                loge("Did not find remoteAddress {" + ipAddress + "} in " +
                        "/proc/net/arp");
            }

        } catch (FileNotFoundException e) {
            loge("Could not open /proc/net/arp to lookup mac address");
        } catch (IOException e) {
            loge("Could not read /proc/net/arp to lookup mac address");
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (IOException e) {
                // Do nothing
            }
        }
        return macAddress;

    }

    private class WifiNetworkFactory extends NetworkFactory {
        public WifiNetworkFactory(Looper l, Context c, String TAG, NetworkCapabilities f) {
            super(l, c, TAG, f);
        }

        @Override
        protected void needNetworkFor(NetworkRequest networkRequest, int score) {
            synchronized (mWifiReqCountLock) {
                if (++mConnectionReqCount == 1) {
                    if (mWifiConnectivityManager != null && mUntrustedReqCount == 0) {
                        mWifiConnectivityManager.enable(true);
                    }
                }
            }
        }

        @Override
        protected void releaseNetworkFor(NetworkRequest networkRequest) {
            synchronized (mWifiReqCountLock) {
                if (--mConnectionReqCount == 0) {
                    if (mWifiConnectivityManager != null && mUntrustedReqCount == 0) {
                        mWifiConnectivityManager.enable(false);
                    }
                }
            }
        }

        @Override
        public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
            pw.println("mConnectionReqCount " + mConnectionReqCount);
        }

    }

    private class UntrustedWifiNetworkFactory extends NetworkFactory {
        public UntrustedWifiNetworkFactory(Looper l, Context c, String tag, NetworkCapabilities f) {
            super(l, c, tag, f);
        }

        @Override
        protected void needNetworkFor(NetworkRequest networkRequest, int score) {
            if (!networkRequest.networkCapabilities.hasCapability(
                    NetworkCapabilities.NET_CAPABILITY_TRUSTED)) {
                synchronized (mWifiReqCountLock) {
                    if (++mUntrustedReqCount == 1) {
                        if (mWifiConnectivityManager != null) {
                            if (mConnectionReqCount == 0) {
                                mWifiConnectivityManager.enable(true);
                            }
                            mWifiConnectivityManager.setUntrustedConnectionAllowed(true);
                        }
                    }
                }
            }
        }

        @Override
        protected void releaseNetworkFor(NetworkRequest networkRequest) {
            if (!networkRequest.networkCapabilities.hasCapability(
                    NetworkCapabilities.NET_CAPABILITY_TRUSTED)) {
                synchronized (mWifiReqCountLock) {
                    if (--mUntrustedReqCount == 0) {
                        if (mWifiConnectivityManager != null) {
                            mWifiConnectivityManager.setUntrustedConnectionAllowed(false);
                            if (mConnectionReqCount == 0) {
                                mWifiConnectivityManager.enable(false);
                            }
                        }
                    }
                }
            }
        }

        @Override
        public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
            pw.println("mUntrustedReqCount " + mUntrustedReqCount);
        }
    }

    void maybeRegisterNetworkFactory() {
        if (mNetworkFactory == null) {
            checkAndSetConnectivityInstance();
            if (mCm != null) {
                mNetworkFactory = new WifiNetworkFactory(getHandler().getLooper(), mContext,
                        NETWORKTYPE, mNetworkCapabilitiesFilter);
                mNetworkFactory.setScoreFilter(60);
                mNetworkFactory.register();

                // We can't filter untrusted network in the capabilities filter because a trusted
                // network would still satisfy a request that accepts untrusted ones.
                mUntrustedNetworkFactory = new UntrustedWifiNetworkFactory(getHandler().getLooper(),
                        mContext, NETWORKTYPE_UNTRUSTED, mNetworkCapabilitiesFilter);
                mUntrustedNetworkFactory.setScoreFilter(Integer.MAX_VALUE);
                mUntrustedNetworkFactory.register();
            }
        }
    }

    /**
     * WifiStateMachine needs to enable/disable other services when wifi is in client mode.  This
     * method allows WifiStateMachine to get these additional system services.
     *
     * At this time, this method is used to setup variables for P2P service and Wifi Aware.
     */
    private void getAdditionalWifiServiceInterfaces() {
        // First set up Wifi Direct
        if (mP2pSupported) {
            IBinder s1 = mFacade.getService(Context.WIFI_P2P_SERVICE);
            WifiP2pServiceImpl wifiP2pServiceImpl =
                    (WifiP2pServiceImpl) IWifiP2pManager.Stub.asInterface(s1);

            if (wifiP2pServiceImpl != null) {
                mWifiP2pChannel = new AsyncChannel();
                mWifiP2pChannel.connect(mContext, getHandler(),
                        wifiP2pServiceImpl.getP2pStateMachineMessenger());
            }
        }
    }

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

    class DefaultState extends State {

        @Override
        public boolean processMessage(Message message) {
            logStateAndMessage(message, this);

            switch (message.what) {
                case AsyncChannel.CMD_CHANNEL_HALF_CONNECTED: {
                    AsyncChannel ac = (AsyncChannel) message.obj;
                    if (ac == mWifiP2pChannel) {
                        if (message.arg1 == AsyncChannel.STATUS_SUCCESSFUL) {
                            p2pSendMessage(AsyncChannel.CMD_CHANNEL_FULL_CONNECTION);
                            // since the p2p channel is connected, we should enable p2p if we are in
                            // connect mode.  We may not be in connect mode yet, we may have just
                            // set the operational mode and started to set up for connect mode.
                            if (mOperationalMode == CONNECT_MODE) {
                                // This message will only be handled if we are in Connect mode.
                                // If we are not in connect mode yet, this will be dropped and the
                                // ConnectMode.enter method will call to enable p2p.
                                sendMessage(CMD_ENABLE_P2P);
                            }
                        } else {
                            // TODO: We should probably do some cleanup or attempt a retry
                            // b/34283611
                            loge("WifiP2pService connection failure, error=" + message.arg1);
                        }
                    } else {
                        loge("got HALF_CONNECTED for unknown channel");
                    }
                    break;
                }
                case AsyncChannel.CMD_CHANNEL_DISCONNECTED: {
                    AsyncChannel ac = (AsyncChannel) message.obj;
                    if (ac == mWifiP2pChannel) {
                        loge("WifiP2pService channel lost, message.arg1 =" + message.arg1);
                        //TODO: Re-establish connection to state machine after a delay (b/34283611)
                        // 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_SAVE_CONFIG:
                    replyToMessage(message, message.what, FAILURE);
                    break;
                case CMD_REMOVE_NETWORK:
                    deleteNetworkConfigAndSendReply(message, false);
                    break;
                case CMD_GET_CONFIGURED_NETWORKS:
                    replyToMessage(message, message.what, mWifiConfigManager.getSavedNetworks());
                    break;
                case CMD_GET_PRIVILEGED_CONFIGURED_NETWORKS:
                    replyToMessage(message, message.what,
                            mWifiConfigManager.getConfiguredNetworksWithPasswords());
                    break;
                case CMD_ENABLE_RSSI_POLL:
                    mEnableRssiPolling = (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_INITIALIZE:
                    boolean ok = mWifiNative.initializeVendorHal();
                    replyToMessage(message, message.what, ok ? SUCCESS : FAILURE);
                    break;
                case CMD_BOOT_COMPLETED:
                    // get other services that we need to manage
                    getAdditionalWifiServiceInterfaces();
                    if (!mWifiConfigManager.loadFromStore()) {
                        Log.e(TAG, "Failed to load from config store");
                    }
                    maybeRegisterNetworkFactory();
                    break;
                case CMD_SCREEN_STATE_CHANGED:
                    handleScreenStateChanged(message.arg1 != 0);
                    break;
                    /* Discard */
                case CMD_START_SCAN:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DISCARD;
                    break;
                case CMD_START_SUPPLICANT:
                case CMD_STOP_SUPPLICANT:
                case CMD_DRIVER_START_TIMED_OUT:
                case CMD_START_AP:
                case CMD_START_AP_FAILURE:
                case CMD_STOP_AP:
                case CMD_AP_STOPPED:
                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.SCAN_FAILED_EVENT:
                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                case WifiMonitor.AUTHENTICATION_FAILURE_EVENT:
                case WifiMonitor.ASSOCIATION_REJECTION_EVENT:
                case WifiMonitor.WPS_OVERLAP_EVENT:
                case CMD_SET_OPERATIONAL_MODE:
                case CMD_RSSI_POLL:
                case DhcpClient.CMD_PRE_DHCP_ACTION:
                case DhcpClient.CMD_PRE_DHCP_ACTION_COMPLETE:
                case DhcpClient.CMD_POST_DHCP_ACTION:
                case CMD_NO_NETWORKS_PERIODIC_SCAN:
                case CMD_ENABLE_P2P:
                case CMD_DISABLE_P2P_RSP:
                case WifiMonitor.SUP_REQUEST_IDENTITY:
                case CMD_TEST_NETWORK_DISCONNECT:
                case WifiMonitor.SUP_REQUEST_SIM_AUTH:
                case CMD_TARGET_BSSID:
                case CMD_START_CONNECT:
                case CMD_START_ROAM:
                case CMD_ASSOCIATED_BSSID:
                case CMD_UNWANTED_NETWORK:
                case CMD_DISCONNECTING_WATCHDOG_TIMER:
                case CMD_ROAM_WATCHDOG_TIMER:
                case CMD_DISABLE_EPHEMERAL_NETWORK:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DISCARD;
                    break;
                case CMD_SET_SUSPEND_OPT_ENABLED:
                    if (message.arg1 == 1) {
                        if (message.arg2 == 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:
                    deleteNetworkConfigAndSendReply(message, true);
                    break;
                case WifiManager.SAVE_NETWORK:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
                    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 CMD_GET_SUPPORTED_FEATURES:
                    int featureSet = mWifiNative.getSupportedFeatureSet();
                    replyToMessage(message, message.what, featureSet);
                    break;
                case CMD_FIRMWARE_ALERT:
                    if (mWifiDiagnostics != null) {
                        byte[] buffer = (byte[])message.obj;
                        int alertReason = message.arg1;
                        mWifiDiagnostics.captureAlertData(alertReason, buffer);
                        mWifiMetrics.incrementAlertReasonCount(alertReason);
                    }
                    break;
                case CMD_GET_LINK_LAYER_STATS:
                    // Not supported hence reply with error message
                    replyToMessage(message, message.what, null);
                    break;
                case WifiP2pServiceImpl.P2P_CONNECTION_CHANGED:
                    NetworkInfo info = (NetworkInfo) message.obj;
                    mP2pConnected.set(info.isConnected());
                    break;
                case WifiP2pServiceImpl.DISCONNECT_WIFI_REQUEST:
                    mTemporarilyDisconnectWifi = (message.arg1 == 1);
                    replyToMessage(message, WifiP2pServiceImpl.DISCONNECT_WIFI_RESPONSE);
                    break;
                /* Link configuration (IP address, DNS, ...) changes notified via netlink */
                case CMD_UPDATE_LINKPROPERTIES:
                    updateLinkProperties((LinkProperties) message.obj);
                    break;
                case CMD_GET_MATCHING_CONFIG:
                    replyToMessage(message, message.what);
                    break;
                case CMD_IP_CONFIGURATION_SUCCESSFUL:
                case CMD_IP_CONFIGURATION_LOST:
                case CMD_IP_REACHABILITY_LOST:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DISCARD;
                    break;
                case CMD_GET_CONNECTION_STATISTICS:
                    replyToMessage(message, message.what, mWifiConnectionStatistics);
                    break;
                case CMD_REMOVE_APP_CONFIGURATIONS:
                    deferMessage(message);
                    break;
                case CMD_REMOVE_USER_CONFIGURATIONS:
                    deferMessage(message);
                    break;
                case CMD_START_IP_PACKET_OFFLOAD:
                    if (mNetworkAgent != null) mNetworkAgent.onPacketKeepaliveEvent(
                            message.arg1,
                            ConnectivityManager.PacketKeepalive.ERROR_INVALID_NETWORK);
                    break;
                case CMD_STOP_IP_PACKET_OFFLOAD:
                    if (mNetworkAgent != null) mNetworkAgent.onPacketKeepaliveEvent(
                            message.arg1,
                            ConnectivityManager.PacketKeepalive.ERROR_INVALID_NETWORK);
                    break;
                case CMD_START_RSSI_MONITORING_OFFLOAD:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DISCARD;
                    break;
                case CMD_STOP_RSSI_MONITORING_OFFLOAD:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DISCARD;
                    break;
                case CMD_USER_SWITCH:
                    Set<Integer> removedNetworkIds =
                            mWifiConfigManager.handleUserSwitch(message.arg1);
                    if (removedNetworkIds.contains(mTargetNetworkId) ||
                            removedNetworkIds.contains(mLastNetworkId)) {
                        // Disconnect and let autojoin reselect a new network
                        sendMessage(CMD_DISCONNECT);
                    }
                    break;
                case CMD_USER_UNLOCK:
                    mWifiConfigManager.handleUserUnlock(message.arg1);
                    break;
                case CMD_USER_STOP:
                    mWifiConfigManager.handleUserStop(message.arg1);
                    break;
                case CMD_QUERY_OSU_ICON:
                case CMD_MATCH_PROVIDER_NETWORK:
                    /* reply with arg1 = 0 - it returns API failure to the calling app
                     * (message.what is not looked at)
                     */
                    replyToMessage(message, message.what);
                    break;
                case CMD_RESET_SIM_NETWORKS:
                    /* Defer this message until supplicant is started. */
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DEFERRED;
                    deferMessage(message);
                    break;
                case CMD_INSTALL_PACKET_FILTER:
                    mWifiNative.installPacketFilter((byte[]) message.obj);
                    break;
                case CMD_SET_FALLBACK_PACKET_FILTERING:
                    if ((boolean) message.obj) {
                        mWifiNative.startFilteringMulticastV4Packets();
                    } else {
                        mWifiNative.stopFilteringMulticastV4Packets();
                    }
                    break;
                case CMD_CLIENT_INTERFACE_BINDER_DEATH:
                    // We have lost contact with a client interface, which means that we cannot
                    // trust that the driver is up or that the interface is ready.  We are fit
                    // for no WiFi related work.
                    transitionTo(mInitialState);
                    break;
                case CMD_DIAGS_CONNECT_TIMEOUT:
                    mWifiDiagnostics.reportConnectionEvent(
                            (Long) message.obj, BaseWifiDiagnostics.CONNECTION_EVENT_FAILED);
                    break;
                default:
                    loge("Error! unhandled message" + message);
                    break;
            }
            return HANDLED;
        }
    }

    class InitialState extends State {

        private void cleanup() {
            // Tearing down the client interfaces below is going to stop our supplicant.
            mWifiMonitor.stopAllMonitoring();

            mDeathRecipient.unlinkToDeath();
            mWifiNative.tearDownInterfaces();

            mWifiNative.stopHal();
        }

        @Override
        public void enter() {
            mWifiStateTracker.updateState(WifiStateTracker.INVALID);
            cleanup();
        }

        @Override
        public boolean processMessage(Message message) {
            logStateAndMessage(message, this);
            switch (message.what) {
                case CMD_START_SUPPLICANT:
                    mClientInterface = mWifiNative.setupDriverForClientMode();
                    if (mClientInterface == null
                            || !mDeathRecipient.linkToDeath(mClientInterface.asBinder())) {
                        setWifiState(WifiManager.WIFI_STATE_UNKNOWN);
                        cleanup();
                        break;
                    }

                    try {
                        // A runtime crash or shutting down AP mode can leave
                        // IP addresses configured, and this affects
                        // connectivity when supplicant starts up.
                        // Ensure we have no IP addresses before a supplicant start.
                        mNwService.clearInterfaceAddresses(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);
                    }

                    if (!mWifiNative.enableSupplicant()) {
                        loge("Failed to start supplicant!");
                        setWifiState(WifiManager.WIFI_STATE_UNKNOWN);
                        cleanup();
                        break;
                    }
                    setSupplicantLogLevel();
                    setWifiState(WIFI_STATE_ENABLING);
                    if (mVerboseLoggingEnabled) log("Supplicant start successful");
                    mWifiMonitor.startMonitoring(mInterfaceName);
                    transitionTo(mSupplicantStartingState);
                    break;
                case CMD_START_AP:
                    transitionTo(mSoftApState);
                    break;
                case CMD_SET_OPERATIONAL_MODE:
                    mOperationalMode = message.arg1;
                    if (mOperationalMode != DISABLED_MODE) {
                        sendMessage(CMD_START_SUPPLICANT);
                    }
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class SupplicantStartingState extends State {
        private void initializeWpsDetails() {
            String detail;
            detail = mPropertyService.get("ro.product.name", "");
            if (!mWifiNative.setDeviceName(detail)) {
                loge("Failed to set device name " +  detail);
            }
            detail = mPropertyService.get("ro.product.manufacturer", "");
            if (!mWifiNative.setManufacturer(detail)) {
                loge("Failed to set manufacturer " + detail);
            }
            detail = mPropertyService.get("ro.product.model", "");
            if (!mWifiNative.setModelName(detail)) {
                loge("Failed to set model name " + detail);
            }
            detail = mPropertyService.get("ro.product.model", "");
            if (!mWifiNative.setModelNumber(detail)) {
                loge("Failed to set model number " + detail);
            }
            detail = mPropertyService.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) {
            logStateAndMessage(message, this);

            switch(message.what) {
                case WifiMonitor.SUP_CONNECTION_EVENT:
                    if (mVerboseLoggingEnabled) log("Supplicant connection established");

                    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());
                    // Attempt to migrate data out of legacy store.
                    if (!mWifiConfigManager.migrateFromLegacyStore()) {
                        Log.e(TAG, "Failed to migrate from legacy config store");
                    }
                    initializeWpsDetails();
                    sendSupplicantConnectionChangedBroadcast(true);
                    transitionTo(mSupplicantStartedState);
                    break;
                case WifiMonitor.SUP_DISCONNECTION_EVENT:
                    if (++mSupplicantRestartCount <= SUPPLICANT_RESTART_TRIES) {
                        loge("Failed to setup control channel, restart supplicant");
                        mWifiMonitor.stopAllMonitoring();
                        mWifiNative.disableSupplicant();
                        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_SET_OPERATIONAL_MODE:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DEFERRED;
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class SupplicantStartedState extends State {
        @Override
        public void enter() {
            if (mVerboseLoggingEnabled) {
                logd("SupplicantStartedState enter");
            }

            mWifiNative.setExternalSim(true);

            /* turn on use of DFS channels */
            mWifiNative.setDfsFlag(true);

            setRandomMacOui();
            mCountryCode.setReadyForChange(true);

            // We can't do this in the constructor because WifiStateMachine is created before the
            // wifi scanning service is initialized
            if (mWifiScanner == null) {
                mWifiScanner = mWifiInjector.getWifiScanner();

                synchronized (mWifiReqCountLock) {
                    mWifiConnectivityManager =
                            mWifiInjector.makeWifiConnectivityManager(mWifiInfo,
                                                                      hasConnectionRequests());
                    mWifiConnectivityManager.setUntrustedConnectionAllowed(mUntrustedReqCount > 0);
                    mWifiConnectivityManager.handleScreenStateChanged(mScreenOn);
                }
            }

            mWifiDiagnostics.startLogging(mVerboseLoggingEnabled);
            mIsRunning = true;
            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);
            // initialize network state
            setNetworkDetailedState(DetailedState.DISCONNECTED);

            // Disable legacy multicast filtering, which on some chipsets defaults to enabled.
            // Legacy IPv6 multicast filtering blocks ICMPv6 router advertisements which breaks IPv6
            // provisioning. Legacy IPv4 multicast filtering may be re-enabled later via
            // IpManager.Callback.setFallbackMulticastFilter()
            mWifiNative.stopFilteringMulticastV4Packets();
            mWifiNative.stopFilteringMulticastV6Packets();

            if (mOperationalMode == SCAN_ONLY_MODE ||
                    mOperationalMode == SCAN_ONLY_WITH_WIFI_OFF_MODE) {
                mWifiNative.disconnect();
                setWifiState(WIFI_STATE_DISABLED);
                transitionTo(mScanModeState);
            } else if (mOperationalMode == CONNECT_MODE) {

                // 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
                // TODO: actually check the supplicant status string and make sure the supplicant
                // is in disconnecte4d state.
                mWifiNative.status();
                // Transitioning to Disconnected state will trigger a scan and subsequently AutoJoin
                transitionTo(mDisconnectedState);
            } else if (mOperationalMode == DISABLED_MODE) {
                transitionTo(mSupplicantStoppingState);
            }

            // Set the right suspend mode settings
            mWifiNative.setSuspendOptimizations(mSuspendOptNeedsDisabled == 0
                    && mUserWantsSuspendOpt.get());

            mWifiNative.setPowerSave(true);

            if (mP2pSupported) {
                if (mOperationalMode == CONNECT_MODE) {
                    p2pSendMessage(WifiStateMachine.CMD_ENABLE_P2P);
                } else {
                    // P2P state machine 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);

            // Enable link layer stats gathering
            mWifiNative.setWifiLinkLayerStats("wlan0", 1);
        }

        @Override
        public boolean processMessage(Message message) {
            logStateAndMessage(message, this);

            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(true);
                    handleNetworkDisconnect();
                    mSupplicantStateTracker.sendMessage(CMD_RESET_SUPPLICANT_STATE);
                    if (mP2pSupported) {
                        transitionTo(mWaitForP2pDisableState);
                    } else {
                        transitionTo(mInitialState);
                    }
                    sendMessageDelayed(CMD_START_SUPPLICANT, SUPPLICANT_RESTART_INTERVAL_MSECS);
                    break;
                case CMD_START_SCAN:
                    // TODO: remove scan request path (b/31445200)
                    handleScanRequest(message);
                    break;
                case WifiMonitor.SCAN_RESULTS_EVENT:
                case WifiMonitor.SCAN_FAILED_EVENT:
                    // TODO: remove handing of SCAN_RESULTS_EVENT and SCAN_FAILED_EVENT when scan
                    // results are retrieved from WifiScanner (b/31444878)
                    maybeRegisterNetworkFactory(); // Make sure our NetworkFactory is registered
                    setScanResults();
                    mIsScanOngoing = false;
                    mIsFullScanOngoing = false;
                    if (mBufferedScanMsg.size() > 0)
                        sendMessage(mBufferedScanMsg.remove());
                    break;
                case CMD_PING_SUPPLICANT:
                    // TODO (b/35620640): Remove this command since the API is deprecated.
                    replyToMessage(message, message.what, FAILURE);
                    break;
                case CMD_START_AP:
                    /* Cannot start soft AP while in client mode */
                    loge("Failed to start soft AP with a running supplicant");
                    setWifiApState(WIFI_AP_STATE_FAILED, WifiManager.SAP_START_FAILURE_GENERAL);
                    break;
                case CMD_SET_OPERATIONAL_MODE:
                    mOperationalMode = message.arg1;
                    if (mOperationalMode == DISABLED_MODE) {
                        transitionTo(mSupplicantStoppingState);
                    }
                    break;
                case CMD_TARGET_BSSID:
                    // Trying to associate to this BSSID
                    if (message.obj != null) {
                        mTargetRoamBSSID = (String) message.obj;
                    }
                    break;
                case CMD_GET_LINK_LAYER_STATS:
                    WifiLinkLayerStats stats = getWifiLinkLayerStats();
                    replyToMessage(message, message.what, stats);
                    break;
                case CMD_RESET_SIM_NETWORKS:
                    log("resetting EAP-SIM/AKA/AKA' networks since SIM was changed");
                    mWifiConfigManager.resetSimNetworks();
                    break;
                case CMD_BLUETOOTH_ADAPTER_STATE_CHANGE:
                    mBluetoothConnectionActive = (message.arg1 !=
                            BluetoothAdapter.STATE_DISCONNECTED);
                    mWifiNative.setBluetoothCoexistenceScanMode(mBluetoothConnectionActive);
                    break;
                case CMD_SET_SUSPEND_OPT_ENABLED:
                    if (message.arg1 == 1) {
                        setSuspendOptimizationsNative(SUSPEND_DUE_TO_SCREEN, true);
                        if (message.arg2 == 1) {
                            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;
                case WifiMonitor.ANQP_DONE_EVENT:
                    // TODO(zqiu): remove this when switch over to wificond for ANQP requests.
                    mPasspointManager.notifyANQPDone((AnqpEvent) message.obj);
                    break;
                case CMD_STOP_IP_PACKET_OFFLOAD: {
                    int slot = message.arg1;
                    int ret = stopWifiIPPacketOffload(slot);
                    if (mNetworkAgent != null) {
                        mNetworkAgent.onPacketKeepaliveEvent(slot, ret);
                    }
                    break;
                }
                case WifiMonitor.RX_HS20_ANQP_ICON_EVENT:
                    // TODO(zqiu): remove this when switch over to wificond for icon requests.
                    mPasspointManager.notifyIconDone((IconEvent) message.obj);
                    break;
                case WifiMonitor.HS20_REMEDIATION_EVENT:
                    // TODO(zqiu): remove this when switch over to wificond for WNM frames
                    // monitoring.
                    mPasspointManager.receivedWnmFrame((WnmData) message.obj);
                    break;
                case CMD_CONFIG_ND_OFFLOAD:
                    final boolean enabled = (message.arg1 > 0);
                    mWifiNative.configureNeighborDiscoveryOffload(enabled);
                    break;
                case CMD_ENABLE_WIFI_CONNECTIVITY_MANAGER:
                    mWifiConnectivityManager.enable(message.arg1 == 1 ? true : false);
                    break;
                case CMD_ENABLE_AUTOJOIN_WHEN_ASSOCIATED:
                    final boolean allowed = (message.arg1 > 0);
                    boolean old_state = mEnableAutoJoinWhenAssociated;
                    mEnableAutoJoinWhenAssociated = allowed;
                    if (!old_state && allowed && mScreenOn
                            && getCurrentState() == mConnectedState) {
                        mWifiConnectivityManager.forceConnectivityScan();
                    }
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }

        @Override
        public void exit() {
            mWifiDiagnostics.stopLogging();

            mIsRunning = false;
            updateBatteryWorkSource(null);
            mScanResults = new ArrayList<>();

            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);
            mBufferedScanMsg.clear();

            mNetworkInfo.setIsAvailable(false);
            if (mNetworkAgent != null) mNetworkAgent.sendNetworkInfo(mNetworkInfo);
            mCountryCode.setReadyForChange(false);
        }
    }

    class SupplicantStoppingState extends State {
        @Override
        public void enter() {
            /* Send any reset commands to supplicant before shutting it down */
            handleNetworkDisconnect();

            String suppState = System.getProperty("init.svc.wpa_supplicant");
            if (suppState == null) suppState = "unknown";

            setWifiState(WIFI_STATE_DISABLING);
            mSupplicantStateTracker.sendMessage(CMD_RESET_SUPPLICANT_STATE);
            logd("SupplicantStoppingState: disableSupplicant "
                    + " init.svc.wpa_supplicant=" + suppState);
            if (mWifiNative.disableSupplicant()) {
                mWifiNative.closeSupplicantConnection();
                sendSupplicantConnectionChangedBroadcast(false);
                setWifiState(WIFI_STATE_DISABLED);
            } else {
                // Failed to disable supplicant
                handleSupplicantConnectionLoss(true);
            }
            transitionTo(mInitialState);
        }
    }

    class WaitForP2pDisableState extends State {
        private State mTransitionToState;
        @Override
        public void enter() {
            switch (getCurrentMessage().what) {
                case WifiMonitor.SUP_DISCONNECTION_EVENT:
                    mTransitionToState = mInitialState;
                    break;
                case CMD_STOP_SUPPLICANT:
                default:
                    mTransitionToState = mSupplicantStoppingState;
                    break;
            }
            p2pSendMessage(WifiStateMachine.CMD_DISABLE_P2P_REQ);
        }
        @Override
        public boolean processMessage(Message message) {
            logStateAndMessage(message, this);

            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_SET_OPERATIONAL_MODE:
                case CMD_START_SCAN:
                case CMD_DISCONNECT:
                case CMD_REASSOCIATE:
                case CMD_RECONNECT:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DEFERRED;
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    class ScanModeState extends State {
        private int mLastOperationMode;
        @Override
        public void enter() {
            mLastOperationMode = mOperationalMode;
            mWifiStateTracker.updateState(WifiStateTracker.SCAN_MODE);
        }
        @Override
        public boolean processMessage(Message message) {
            logStateAndMessage(message, this);

            switch(message.what) {
                case CMD_SET_OPERATIONAL_MODE:
                    if (message.arg1 == CONNECT_MODE) {
                        mOperationalMode = CONNECT_MODE;
                        transitionTo(mDisconnectedState);
                    } else if (message.arg1 == DISABLED_MODE) {
                        transitionTo(mSupplicantStoppingState);
                    }
                    // Nothing to do
                    break;
                // Handle scan. All the connection related commands are
                // handled only in ConnectModeState
                case CMD_START_SCAN:
                    handleScanRequest(message);
                    break;
                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                    SupplicantState state = handleSupplicantStateChange(message);
                    if (mVerboseLoggingEnabled) log("SupplicantState= " + state);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }


    String smToString(Message message) {
        return smToString(message.what);
    }

    String smToString(int what) {
        String s = sSmToString.get(what);
        if (s != null) {
            return s;
        }
        switch (what) {
            case WifiMonitor.DRIVER_HUNG_EVENT:
                s = "DRIVER_HUNG_EVENT";
                break;
            case AsyncChannel.CMD_CHANNEL_HALF_CONNECTED:
                s = "AsyncChannel.CMD_CHANNEL_HALF_CONNECTED";
                break;
            case AsyncChannel.CMD_CHANNEL_DISCONNECTED:
                s = "AsyncChannel.CMD_CHANNEL_DISCONNECTED";
                break;
            case WifiP2pServiceImpl.DISCONNECT_WIFI_REQUEST:
                s = "WifiP2pServiceImpl.DISCONNECT_WIFI_REQUEST";
                break;
            case WifiManager.DISABLE_NETWORK:
                s = "WifiManager.DISABLE_NETWORK";
                break;
            case WifiManager.CONNECT_NETWORK:
                s = "CONNECT_NETWORK";
                break;
            case WifiManager.SAVE_NETWORK:
                s = "SAVE_NETWORK";
                break;
            case WifiManager.FORGET_NETWORK:
                s = "FORGET_NETWORK";
                break;
            case WifiMonitor.SUP_CONNECTION_EVENT:
                s = "SUP_CONNECTION_EVENT";
                break;
            case WifiMonitor.SUP_DISCONNECTION_EVENT:
                s = "SUP_DISCONNECTION_EVENT";
                break;
            case WifiMonitor.SCAN_RESULTS_EVENT:
                s = "SCAN_RESULTS_EVENT";
                break;
            case WifiMonitor.SCAN_FAILED_EVENT:
                s = "SCAN_FAILED_EVENT";
                break;
            case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                s = "SUPPLICANT_STATE_CHANGE_EVENT";
                break;
            case WifiMonitor.AUTHENTICATION_FAILURE_EVENT:
                s = "AUTHENTICATION_FAILURE_EVENT";
                break;
            case WifiMonitor.SSID_TEMP_DISABLED:
                s = "SSID_TEMP_DISABLED";
                break;
            case WifiMonitor.SSID_REENABLED:
                s = "SSID_REENABLED";
                break;
            case WifiMonitor.WPS_SUCCESS_EVENT:
                s = "WPS_SUCCESS_EVENT";
                break;
            case WifiMonitor.WPS_FAIL_EVENT:
                s = "WPS_FAIL_EVENT";
                break;
            case WifiMonitor.SUP_REQUEST_IDENTITY:
                s = "SUP_REQUEST_IDENTITY";
                break;
            case WifiMonitor.NETWORK_CONNECTION_EVENT:
                s = "NETWORK_CONNECTION_EVENT";
                break;
            case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                s = "NETWORK_DISCONNECTION_EVENT";
                break;
            case WifiMonitor.ASSOCIATION_REJECTION_EVENT:
                s = "ASSOCIATION_REJECTION_EVENT";
                break;
            case WifiMonitor.ANQP_DONE_EVENT:
                s = "WifiMonitor.ANQP_DONE_EVENT";
                break;
            case WifiMonitor.RX_HS20_ANQP_ICON_EVENT:
                s = "WifiMonitor.RX_HS20_ANQP_ICON_EVENT";
                break;
            case WifiMonitor.GAS_QUERY_DONE_EVENT:
                s = "WifiMonitor.GAS_QUERY_DONE_EVENT";
                break;
            case WifiMonitor.HS20_REMEDIATION_EVENT:
                s = "WifiMonitor.HS20_REMEDIATION_EVENT";
                break;
            case WifiMonitor.GAS_QUERY_START_EVENT:
                s = "WifiMonitor.GAS_QUERY_START_EVENT";
                break;
            case WifiP2pServiceImpl.GROUP_CREATING_TIMED_OUT:
                s = "GROUP_CREATING_TIMED_OUT";
                break;
            case WifiP2pServiceImpl.P2P_CONNECTION_CHANGED:
                s = "P2P_CONNECTION_CHANGED";
                break;
            case WifiP2pServiceImpl.DISCONNECT_WIFI_RESPONSE:
                s = "P2P.DISCONNECT_WIFI_RESPONSE";
                break;
            case WifiP2pServiceImpl.SET_MIRACAST_MODE:
                s = "P2P.SET_MIRACAST_MODE";
                break;
            case WifiP2pServiceImpl.BLOCK_DISCOVERY:
                s = "P2P.BLOCK_DISCOVERY";
                break;
            case WifiManager.CANCEL_WPS:
                s = "CANCEL_WPS";
                break;
            case WifiManager.CANCEL_WPS_FAILED:
                s = "CANCEL_WPS_FAILED";
                break;
            case WifiManager.CANCEL_WPS_SUCCEDED:
                s = "CANCEL_WPS_SUCCEDED";
                break;
            case WifiManager.START_WPS:
                s = "START_WPS";
                break;
            case WifiManager.START_WPS_SUCCEEDED:
                s = "START_WPS_SUCCEEDED";
                break;
            case WifiManager.WPS_FAILED:
                s = "WPS_FAILED";
                break;
            case WifiManager.WPS_COMPLETED:
                s = "WPS_COMPLETED";
                break;
            case WifiManager.RSSI_PKTCNT_FETCH:
                s = "RSSI_PKTCNT_FETCH";
                break;
            default:
                s = "what:" + Integer.toString(what);
                break;
        }
        return s;
    }

    void registerConnected() {
        if (mLastNetworkId != WifiConfiguration.INVALID_NETWORK_ID) {
            mWifiConfigManager.updateNetworkAfterConnect(mLastNetworkId);
            // On connect, reset wifiScoreReport
            mWifiScoreReport.reset();
       }
    }

    void registerDisconnected() {
        if (mLastNetworkId != WifiConfiguration.INVALID_NETWORK_ID) {
            mWifiConfigManager.updateNetworkAfterDisconnect(mLastNetworkId);
            // We are switching away from this configuration,
            // hence record the time we were connected last
            WifiConfiguration config = mWifiConfigManager.getConfiguredNetwork(mLastNetworkId);
            if (config != null) {
                // Remove WifiConfiguration for ephemeral or Passpoint networks, since they're
                // temporary networks.
                if (config.ephemeral || config.isPasspoint()) {
                    mWifiConfigManager.removeNetwork(mLastNetworkId, Process.WIFI_UID);
                }
            }
        }
    }

    /**
     * Returns Wificonfiguration object correponding to the currently connected network, null if
     * not connected.
     */
    public WifiConfiguration getCurrentWifiConfiguration() {
        if (mLastNetworkId == WifiConfiguration.INVALID_NETWORK_ID) {
            return null;
        }
        return mWifiConfigManager.getConfiguredNetwork(mLastNetworkId);
    }

    ScanResult getCurrentScanResult() {
        WifiConfiguration config = getCurrentWifiConfiguration();
        if (config == null) {
            return null;
        }
        String BSSID = mWifiInfo.getBSSID();
        if (BSSID == null) {
            BSSID = mTargetRoamBSSID;
        }
        ScanDetailCache scanDetailCache =
                mWifiConfigManager.getScanDetailCacheForNetwork(config.networkId);

        if (scanDetailCache == null) {
            return null;
        }

        return scanDetailCache.get(BSSID);
    }

    String getCurrentBSSID() {
        if (isLinkDebouncing()) {
            return null;
        }
        return mLastBssid;
    }

    class ConnectModeState extends State {

        @Override
        public void enter() {
            // Let the system know that wifi is available in client mode.
            setWifiState(WIFI_STATE_ENABLED);

            mNetworkInfo.setIsAvailable(true);
            if (mNetworkAgent != null) mNetworkAgent.sendNetworkInfo(mNetworkInfo);

            // initialize network state
            setNetworkDetailedState(DetailedState.DISCONNECTED);


            // Inform WifiConnectivityManager that Wifi is enabled
            mWifiConnectivityManager.setWifiEnabled(true);
            // Inform metrics that Wifi is Enabled (but not yet connected)
            mWifiMetrics.setWifiState(WifiMetricsProto.WifiLog.WIFI_DISCONNECTED);
            // Inform p2p service that wifi is up and ready when applicable
            p2pSendMessage(WifiStateMachine.CMD_ENABLE_P2P);
        }

        @Override
        public void exit() {
            // Let the system know that wifi is not available since we are exiting client mode.
            mNetworkInfo.setIsAvailable(false);
            if (mNetworkAgent != null) mNetworkAgent.sendNetworkInfo(mNetworkInfo);
            // Inform WifiConnectivityManager that Wifi is disabled
            mWifiConnectivityManager.setWifiEnabled(false);
            // Inform metrics that Wifi is being disabled (Toggled, airplane enabled, etc)
            mWifiMetrics.setWifiState(WifiMetricsProto.WifiLog.WIFI_DISABLED);
        }

        @Override
        public boolean processMessage(Message message) {
            WifiConfiguration config;
            int netId;
            boolean ok;
            boolean didDisconnect;
            String bssid;
            String ssid;
            NetworkUpdateResult result;
            Set<Integer> removedNetworkIds;
            int reasonCode;
            logStateAndMessage(message, this);

            switch (message.what) {
                case WifiMonitor.ASSOCIATION_REJECTION_EVENT:
                    mWifiDiagnostics.captureBugReportData(
                            WifiDiagnostics.REPORT_REASON_ASSOC_FAILURE);
                    didBlackListBSSID = false;
                    bssid = (String) message.obj;
                    reasonCode = message.arg2;
                    if (bssid == null || TextUtils.isEmpty(bssid)) {
                        // If BSSID is null, use the target roam BSSID
                        bssid = mTargetRoamBSSID;
                    }
                    if (bssid != null) {
                        // If we have a BSSID, tell configStore to black list it
                        didBlackListBSSID = mWifiConnectivityManager.trackBssid(bssid, false,
                            reasonCode);
                    }
                    mWifiConfigManager.updateNetworkSelectionStatus(mTargetNetworkId,
                            WifiConfiguration.NetworkSelectionStatus
                            .DISABLED_ASSOCIATION_REJECTION);
                    mSupplicantStateTracker.sendMessage(WifiMonitor.ASSOCIATION_REJECTION_EVENT);
                    //If rejection occurred while Metrics is tracking a ConnnectionEvent, end it.
                    reportConnectionAttemptEnd(
                            WifiMetrics.ConnectionEvent.FAILURE_ASSOCIATION_REJECTION,
                            WifiMetricsProto.ConnectionEvent.HLF_NONE);
                    mWifiInjector.getWifiLastResortWatchdog()
                            .noteConnectionFailureAndTriggerIfNeeded(
                                    getTargetSsid(), bssid,
                                    WifiLastResortWatchdog.FAILURE_CODE_ASSOCIATION);
                    break;
                case WifiMonitor.AUTHENTICATION_FAILURE_EVENT:
                    mWifiDiagnostics.captureBugReportData(
                            WifiDiagnostics.REPORT_REASON_AUTH_FAILURE);
                    mSupplicantStateTracker.sendMessage(WifiMonitor.AUTHENTICATION_FAILURE_EVENT);
                    // In case of wrong password, rely on SSID_TEMP_DISABLE event to update
                    // the WifiConfigManager
                    if ((message.arg2 != WifiMonitor.AUTHENTICATION_FAILURE_REASON_WRONG_PSWD)
                            && (mTargetNetworkId != WifiConfiguration.INVALID_NETWORK_ID)) {
                        mWifiConfigManager.updateNetworkSelectionStatus(mTargetNetworkId,
                                WifiConfiguration.NetworkSelectionStatus
                                        .DISABLED_AUTHENTICATION_FAILURE);
                    }
                    //If failure occurred while Metrics is tracking a ConnnectionEvent, end it.
                    reportConnectionAttemptEnd(
                            WifiMetrics.ConnectionEvent.FAILURE_AUTHENTICATION_FAILURE,
                            WifiMetricsProto.ConnectionEvent.HLF_NONE);
                    mWifiInjector.getWifiLastResortWatchdog()
                            .noteConnectionFailureAndTriggerIfNeeded(
                                    getTargetSsid(), mTargetRoamBSSID,
                                    WifiLastResortWatchdog.FAILURE_CODE_AUTHENTICATION);
                    break;
                case WifiMonitor.SSID_TEMP_DISABLED:
                    netId = lookupFrameworkNetworkId(message.arg1);
                    Log.e(TAG, "Supplicant SSID temporary disabled:"
                            + mWifiConfigManager.getConfiguredNetwork(netId));
                    mWifiConfigManager.updateNetworkSelectionStatus(
                            netId,
                            WifiConfiguration.NetworkSelectionStatus
                            .DISABLED_AUTHENTICATION_FAILURE);
                    reportConnectionAttemptEnd(
                            WifiMetrics.ConnectionEvent.FAILURE_SSID_TEMP_DISABLED,
                            WifiMetricsProto.ConnectionEvent.HLF_NONE);
                    mWifiInjector.getWifiLastResortWatchdog()
                            .noteConnectionFailureAndTriggerIfNeeded(
                                    getTargetSsid(), mTargetRoamBSSID,
                                    WifiLastResortWatchdog.FAILURE_CODE_AUTHENTICATION);
                    break;
                case WifiMonitor.SSID_REENABLED:
                    netId = lookupFrameworkNetworkId(message.arg1);
                    Log.d(TAG, "Supplicant SSID reenable:"
                            + mWifiConfigManager.getConfiguredNetwork(netId));
                    // Do not re-enable it in Quality Network Selection since framework has its own
                    // Algorithm of disable/enable
                    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");
                        // Rely on the fact that this will force us into killing supplicant and then
                        // restart supplicant from a clean state.
                        transitionTo(mSupplicantStoppingState);
                        sendMessage(CMD_START_SUPPLICANT);
                        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 (!isLinkDebouncing() && state == SupplicantState.DISCONNECTED &&
                            mNetworkInfo.getState() != NetworkInfo.State.DISCONNECTED) {
                        if (mVerboseLoggingEnabled) {
                            log("Missed CTRL-EVENT-DISCONNECTED, disconnect");
                        }
                        handleNetworkDisconnect();
                        transitionTo(mDisconnectedState);
                    }

                    // If we have COMPLETED a connection to a BSSID, start doing
                    // DNAv4/DNAv6 -style probing for on-link neighbors of
                    // interest (e.g. routers); harmless if none are configured.
                    if (state == SupplicantState.COMPLETED) {
                        mIpManager.confirmConfiguration();
                    }
                    break;
                case WifiP2pServiceImpl.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;
                    result = mWifiConfigManager.addOrUpdateNetwork(config, message.sendingUid);
                    if (!result.isSuccess()) {
                        messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
                    }
                    replyToMessage(message, message.what, result.getNetworkId());
                    break;
                case CMD_REMOVE_NETWORK:
                    if (!deleteNetworkConfigAndSendReply(message, false)) {
                        // failed to remove the config and caller was notified
                        messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
                        break;
                    }
                    //  we successfully deleted the network config
                    netId = message.arg1;
                    if (netId == mTargetNetworkId || netId == mLastNetworkId) {
                        // Disconnect and let autojoin reselect a new network
                        sendMessage(CMD_DISCONNECT);
                    }
                    break;
                case CMD_ENABLE_NETWORK:
                    boolean disableOthers = message.arg2 == 1;
                    netId = message.arg1;
                    if (disableOthers) {
                        // If the app has all the necessary permissions, this will trigger a connect
                        // attempt.
                        ok = connectToUserSelectNetwork(netId, message.sendingUid);
                    } else {
                        ok = mWifiConfigManager.enableNetwork(netId, false, message.sendingUid);
                    }
                    if (!ok) {
                        messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
                    }
                    replyToMessage(message, message.what, ok ? SUCCESS : FAILURE);
                    break;
                case WifiManager.DISABLE_NETWORK:
                    netId = message.arg1;
                    if (mWifiConfigManager.disableNetwork(netId, message.sendingUid)) {
                        replyToMessage(message, WifiManager.DISABLE_NETWORK_SUCCEEDED);
                        if (netId == mTargetNetworkId || netId == mLastNetworkId) {
                            // Disconnect and let autojoin reselect a new network
                            sendMessage(CMD_DISCONNECT);
                        }
                    } else {
                        loge("Failed to remove network");
                        messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
                        replyToMessage(message, WifiManager.DISABLE_NETWORK_FAILED,
                                WifiManager.ERROR);
                    }
                    break;
                case CMD_DISABLE_EPHEMERAL_NETWORK:
                    config = mWifiConfigManager.disableEphemeralNetwork((String)message.obj);
                    if (config != null) {
                        if (config.networkId == mTargetNetworkId
                                || config.networkId == mLastNetworkId) {
                            // Disconnect and let autojoin reselect a new network
                            sendMessage(CMD_DISCONNECT);
                        }
                    }
                    break;
                case CMD_SAVE_CONFIG:
                    ok = mWifiConfigManager.saveToStore(true);
                    replyToMessage(message, CMD_SAVE_CONFIG, ok ? SUCCESS : FAILURE);
                    // Inform the backup manager about a data change
                    mBackupManagerProxy.notifyDataChanged();
                    break;
                case WifiMonitor.SUP_REQUEST_IDENTITY:
                    int supplicantNetworkId = message.arg2;
                    netId = lookupFrameworkNetworkId(supplicantNetworkId);
                    boolean identitySent = false;
                    // For SIM & AKA/AKA' EAP method Only, get identity from ICC
                    if (targetWificonfiguration != null
                            && targetWificonfiguration.networkId == netId
                            && TelephonyUtil.isSimConfig(targetWificonfiguration)) {
                        String identity =
                                TelephonyUtil.getSimIdentity(getTelephonyManager(),
                                        targetWificonfiguration);
                        if (identity != null) {
                            mWifiNative.simIdentityResponse(supplicantNetworkId, identity);
                            identitySent = true;
                        } else {
                            Log.e(TAG, "Unable to retrieve identity from Telephony");
                        }
                    }
                    if (!identitySent) {
                        // Supplicant lacks credentials to connect to that network, hence black list
                        ssid = (String) message.obj;
                        if (targetWificonfiguration != null && ssid != null
                                && targetWificonfiguration.SSID != null
                                && targetWificonfiguration.SSID.equals("\"" + ssid + "\"")) {
                            mWifiConfigManager.updateNetworkSelectionStatus(
                                    targetWificonfiguration.networkId,
                                    WifiConfiguration.NetworkSelectionStatus
                                            .DISABLED_AUTHENTICATION_NO_CREDENTIALS);
                        }
                        mWifiNative.disconnect();
                    }
                    break;
                case WifiMonitor.SUP_REQUEST_SIM_AUTH:
                    logd("Received SUP_REQUEST_SIM_AUTH");
                    SimAuthRequestData requestData = (SimAuthRequestData) message.obj;
                    if (requestData != null) {
                        if (requestData.protocol == WifiEnterpriseConfig.Eap.SIM) {
                            handleGsmAuthRequest(requestData);
                        } else if (requestData.protocol == WifiEnterpriseConfig.Eap.AKA
                            || requestData.protocol == WifiEnterpriseConfig.Eap.AKA_PRIME) {
                            handle3GAuthRequest(requestData);
                        }
                    } else {
                        loge("Invalid sim auth request");
                    }
                    break;
                case CMD_GET_MATCHING_CONFIG:
                    // TODO(b/31065385)
                    replyToMessage(message, message.what, null);
                    break;
                case CMD_RECONNECT:
                    mWifiConnectivityManager.forceConnectivityScan();
                    break;
                case CMD_REASSOCIATE:
                    lastConnectAttemptTimestamp = mClock.getWallClockMillis();
                    mWifiNative.reassociate();
                    break;
                case CMD_RELOAD_TLS_AND_RECONNECT:
                    if (mWifiConfigManager.needsUnlockedKeyStore()) {
                        logd("Reconnecting to give a chance to un-connected TLS networks");
                        mWifiNative.disconnect();
                        lastConnectAttemptTimestamp = mClock.getWallClockMillis();
                        mWifiNative.reconnect();
                    }
                    break;
                case CMD_START_ROAM:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DISCARD;
                    return HANDLED;
                case CMD_START_CONNECT:
                    /* connect command coming from auto-join */
                    netId = message.arg1;
                    bssid = (String) message.obj;
                    config = mWifiConfigManager.getConfiguredNetworkWithPassword(netId);
                    logd("CMD_START_CONNECT sup state "
                            + mSupplicantStateTracker.getSupplicantStateName()
                            + " my state " + getCurrentState().getName()
                            + " nid=" + Integer.toString(netId)
                            + " roam=" + Boolean.toString(mAutoRoaming));
                    if (config == null) {
                        loge("CMD_START_CONNECT and no config, bail out...");
                        break;
                    }
                    mTargetNetworkId = netId;
                    setTargetBssid(config, bssid);

                    reportConnectionAttemptStart(config, mTargetRoamBSSID,
                            WifiMetricsProto.ConnectionEvent.ROAM_UNRELATED);
                    boolean shouldDisconnect = (getCurrentState() != mDisconnectedState);
                    if (mWifiNative.connectToNetwork(config, shouldDisconnect)) {
                        lastConnectAttemptTimestamp = mClock.getWallClockMillis();
                        targetWificonfiguration = config;
                        mAutoRoaming = false;
                        if (isRoaming() || isLinkDebouncing()) {
                            transitionTo(mRoamingState);
                        } else if (shouldDisconnect) {
                            transitionTo(mDisconnectingState);
                        } else {
                            transitionTo(mDisconnectedState);
                        }
                    } else {
                        loge("CMD_START_CONNECT Failed to start connection to network " + config);
                        reportConnectionAttemptEnd(
                                WifiMetrics.ConnectionEvent.FAILURE_CONNECT_NETWORK_FAILED,
                                WifiMetricsProto.ConnectionEvent.HLF_NONE);
                        replyToMessage(message, WifiManager.CONNECT_NETWORK_FAILED,
                                WifiManager.ERROR);
                        break;
                    }
                    break;
                case CMD_REMOVE_APP_CONFIGURATIONS:
                    removedNetworkIds =
                            mWifiConfigManager.removeNetworksForApp((ApplicationInfo) message.obj);
                    if (removedNetworkIds.contains(mTargetNetworkId) ||
                            removedNetworkIds.contains(mLastNetworkId)) {
                        // Disconnect and let autojoin reselect a new network.
                        sendMessage(CMD_DISCONNECT);
                    }
                    break;
                case CMD_REMOVE_USER_CONFIGURATIONS:
                    removedNetworkIds =
                            mWifiConfigManager.removeNetworksForUser((Integer) message.arg1);
                    if (removedNetworkIds.contains(mTargetNetworkId) ||
                            removedNetworkIds.contains(mLastNetworkId)) {
                        // Disconnect and let autojoin reselect a new network.
                        sendMessage(CMD_DISCONNECT);
                    }
                    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
                     */
                    netId = message.arg1;
                    config = (WifiConfiguration) message.obj;
                    mWifiConnectionStatistics.numWifiManagerJoinAttempt++;
                    // New network addition.
                    if (config != null) {
                        result = mWifiConfigManager.addOrUpdateNetwork(config, message.sendingUid);
                        if (!result.isSuccess()) {
                            loge("CONNECT_NETWORK adding/updating config=" + config + " failed");
                            messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
                            replyToMessage(message, WifiManager.CONNECT_NETWORK_FAILED,
                                    WifiManager.ERROR);
                            break;
                        }
                        netId = result.getNetworkId();
                    }
                    if (!connectToUserSelectNetwork(netId, message.sendingUid)) {
                        messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
                        replyToMessage(message, WifiManager.CONNECT_NETWORK_FAILED,
                                WifiManager.NOT_AUTHORIZED);
                        break;
                    }
                    broadcastWifiCredentialChanged(WifiManager.WIFI_CREDENTIAL_SAVED, config);
                    replyToMessage(message, WifiManager.CONNECT_NETWORK_SUCCEEDED);
                    break;
                case WifiManager.SAVE_NETWORK:
                    config = (WifiConfiguration) message.obj;
                    mWifiConnectionStatistics.numWifiManagerJoinAttempt++;
                    if (config == null) {
                        loge("SAVE_NETWORK with null configuration"
                                + mSupplicantStateTracker.getSupplicantStateName()
                                + " my state " + getCurrentState().getName());
                        messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
                        replyToMessage(message, WifiManager.SAVE_NETWORK_FAILED,
                                WifiManager.ERROR);
                        break;
                    }
                    result = mWifiConfigManager.addOrUpdateNetwork(config, message.sendingUid);
                    if (!result.isSuccess()) {
                        loge("SAVE_NETWORK adding/updating config=" + config + " failed");
                        messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
                        replyToMessage(message, WifiManager.SAVE_NETWORK_FAILED,
                                WifiManager.ERROR);
                        break;
                    }
                    netId = result.getNetworkId();
                    if (mWifiInfo.getNetworkId() == netId) {
                        if (result.hasIpChanged()) {
                            // The currently connection configuration was changed
                            // We switched from DHCP to static or from static to DHCP, or the
                            // static IP address has changed.
                            log("Reconfiguring IP on connection");
                            // TODO: clear addresses and disable IPv6
                            // to simplify obtainingIpState.
                            transitionTo(mObtainingIpState);
                        }
                        if (result.hasProxyChanged()) {
                            log("Reconfiguring proxy on connection");
                            mIpManager.setHttpProxy(
                                    getCurrentWifiConfiguration().getHttpProxy());
                        }
                    } else {
                        if (!connectToUserSelectNetwork(netId, message.sendingUid)) {
                            messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
                            replyToMessage(message, WifiManager.SAVE_NETWORK_FAILED,
                                    WifiManager.NOT_AUTHORIZED);
                            break;
                        }
                    }
                    broadcastWifiCredentialChanged(WifiManager.WIFI_CREDENTIAL_SAVED, config);
                    replyToMessage(message, WifiManager.SAVE_NETWORK_SUCCEEDED);
                    break;
                case WifiManager.FORGET_NETWORK:
                    if (!deleteNetworkConfigAndSendReply(message, true)) {
                        // Caller was notified of failure, nothing else to do
                        break;
                    }
                    // the network was deleted
                    netId = message.arg1;
                    if (netId == mTargetNetworkId || netId == mLastNetworkId) {
                        // Disconnect and let autojoin reselect a new network
                        sendMessage(CMD_DISCONNECT);
                    }
                    break;
                case WifiManager.START_WPS:
                    WpsInfo wpsInfo = (WpsInfo) message.obj;
                    WpsResult wpsResult = new WpsResult();
                    switch (wpsInfo.setup) {
                        case WpsInfo.PBC:
                            if (mWifiNative.startWpsPbc(wpsInfo.BSSID)) {
                                wpsResult.status = WpsResult.Status.SUCCESS;
                            } else {
                                Log.e(TAG, "Failed to start WPS push button configuration");
                                wpsResult.status = WpsResult.Status.FAILURE;
                            }
                            break;
                        case WpsInfo.KEYPAD:
                            if (mWifiNative.startWpsRegistrar(wpsInfo.BSSID, wpsInfo.pin)) {
                                wpsResult.status = WpsResult.Status.SUCCESS;
                            } else {
                                Log.e(TAG, "Failed to start WPS push button configuration");
                                wpsResult.status = WpsResult.Status.FAILURE;
                            }
                            break;
                        case WpsInfo.DISPLAY:
                            wpsResult.pin = mWifiNative.startWpsPinDisplay(wpsInfo.BSSID);
                            if (!TextUtils.isEmpty(wpsResult.pin)) {
                                wpsResult.status = WpsResult.Status.SUCCESS;
                            } else {
                                Log.e(TAG, "Failed to start WPS pin method configuration");
                                wpsResult.status = WpsResult.Status.FAILURE;
                            }
                            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 CMD_ASSOCIATED_BSSID:
                    // This is where we can confirm the connection BSSID. Use it to find the
                    // right ScanDetail to populate metrics.
                    String someBssid = (String) message.obj;
                    if (someBssid != null) {
                        // Get the ScanDetail associated with this BSSID.
                        ScanDetailCache scanDetailCache =
                                mWifiConfigManager.getScanDetailCacheForNetwork(mTargetNetworkId);
                        if (scanDetailCache != null) {
                            mWifiMetrics.setConnectionScanDetail(scanDetailCache.getScanDetail(
                                    someBssid));
                        }
                    }
                    return NOT_HANDLED;
                case WifiMonitor.NETWORK_CONNECTION_EVENT:
                    if (mVerboseLoggingEnabled) log("Network connection established");
                    mLastNetworkId = lookupFrameworkNetworkId(message.arg1);
                    mLastBssid = (String) message.obj;
                    reasonCode = message.arg2;
                    // TODO: This check should not be needed after WifiStateMachinePrime refactor.
                    // Currently, the last connected network configuration is left in
                    // wpa_supplicant, this may result in wpa_supplicant initiating connection
                    // to it after a config store reload. Hence the old network Id lookups may not
                    // work, so disconnect the network and let network selector reselect a new
                    // network.
                    if (getCurrentWifiConfiguration() != null) {
                        mWifiInfo.setBSSID(mLastBssid);
                        mWifiInfo.setNetworkId(mLastNetworkId);
                        mWifiConnectivityManager.trackBssid(mLastBssid, true, reasonCode);
                        sendNetworkStateChangeBroadcast(mLastBssid);
                        transitionTo(mObtainingIpState);
                    } else {
                        logw("Connected to unknown networkId " + mLastNetworkId
                                + ", disconnecting...");
                        sendMessage(CMD_DISCONNECT);
                    }
                    break;
                case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                    // Calling handleNetworkDisconnect here is redundant because we might already
                    // have called it when leaving L2ConnectedState to go to disconnecting state
                    // or thru other path
                    // We should normally check the mWifiInfo or mLastNetworkId so as to check
                    // if they are valid, and only in this case call handleNEtworkDisconnect,
                    // TODO: this should be fixed for a L MR release
                    // The side effect of calling handleNetworkDisconnect twice is that a bunch of
                    // idempotent commands are executed twice (stopping Dhcp, enabling the SPS mode
                    // at the chip etc...
                    if (mVerboseLoggingEnabled) log("ConnectModeState: Network connection lost ");
                    handleNetworkDisconnect();
                    transitionTo(mDisconnectedState);
                    break;
                case CMD_QUERY_OSU_ICON:
                    mPasspointManager.queryPasspointIcon(
                            ((Bundle) message.obj).getLong(EXTRA_OSU_ICON_QUERY_BSSID),
                            ((Bundle) message.obj).getString(EXTRA_OSU_ICON_QUERY_FILENAME));
                    break;
                case CMD_MATCH_PROVIDER_NETWORK:
                    // TODO(b/31065385): Passpoint config management.
                    replyToMessage(message, message.what, 0);
                    break;
                case CMD_ENABLE_P2P:
                    p2pSendMessage(WifiStateMachine.CMD_ENABLE_P2P);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    private void updateCapabilities(WifiConfiguration config) {
        NetworkCapabilities networkCapabilities = new NetworkCapabilities(mDfltNetworkCapabilities);
        if (config != null) {
            if (config.ephemeral) {
                networkCapabilities.removeCapability(
                        NetworkCapabilities.NET_CAPABILITY_TRUSTED);
            } else {
                networkCapabilities.addCapability(
                        NetworkCapabilities.NET_CAPABILITY_TRUSTED);
            }

            networkCapabilities.setSignalStrength(
                    (mWifiInfo.getRssi() != WifiInfo.INVALID_RSSI)
                    ? mWifiInfo.getRssi()
                    : NetworkCapabilities.SIGNAL_STRENGTH_UNSPECIFIED);
        }

        if (mWifiInfo.getMeteredHint()) {
            networkCapabilities.removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_METERED);
        }

        mNetworkAgent.sendNetworkCapabilities(networkCapabilities);
    }

    private class WifiNetworkAgent extends NetworkAgent {
        public WifiNetworkAgent(Looper l, Context c, String TAG, NetworkInfo ni,
                NetworkCapabilities nc, LinkProperties lp, int score, NetworkMisc misc) {
            super(l, c, TAG, ni, nc, lp, score, misc);
        }

        @Override
        protected void unwanted() {
            // Ignore if we're not the current networkAgent.
            if (this != mNetworkAgent) return;
            if (mVerboseLoggingEnabled) {
                log("WifiNetworkAgent -> Wifi unwanted score " + Integer.toString(mWifiInfo.score));
            }
            unwantedNetwork(NETWORK_STATUS_UNWANTED_DISCONNECT);
        }

        @Override
        protected void networkStatus(int status, String redirectUrl) {
            if (this != mNetworkAgent) return;
            if (status == NetworkAgent.INVALID_NETWORK) {
                if (mVerboseLoggingEnabled) {
                    log("WifiNetworkAgent -> Wifi networkStatus invalid, score="
                            + Integer.toString(mWifiInfo.score));
                }
                unwantedNetwork(NETWORK_STATUS_UNWANTED_VALIDATION_FAILED);
            } else if (status == NetworkAgent.VALID_NETWORK) {
                if (mVerboseLoggingEnabled) {
                    log("WifiNetworkAgent -> Wifi networkStatus valid, score= "
                            + Integer.toString(mWifiInfo.score));
                }
                doNetworkStatus(status);
            }
        }

        @Override
        protected void saveAcceptUnvalidated(boolean accept) {
            if (this != mNetworkAgent) return;
            WifiStateMachine.this.sendMessage(CMD_ACCEPT_UNVALIDATED, accept ? 1 : 0);
        }

        @Override
        protected void startPacketKeepalive(Message msg) {
            WifiStateMachine.this.sendMessage(
                    CMD_START_IP_PACKET_OFFLOAD, msg.arg1, msg.arg2, msg.obj);
        }

        @Override
        protected void stopPacketKeepalive(Message msg) {
            WifiStateMachine.this.sendMessage(
                    CMD_STOP_IP_PACKET_OFFLOAD, msg.arg1, msg.arg2, msg.obj);
        }

        @Override
        protected void setSignalStrengthThresholds(int[] thresholds) {
            // 0. If there are no thresholds, or if the thresholds are invalid, stop RSSI monitoring.
            // 1. Tell the hardware to start RSSI monitoring here, possibly adding MIN_VALUE and
            //    MAX_VALUE at the start/end of the thresholds array if necessary.
            // 2. Ensure that when the hardware event fires, we fetch the RSSI from the hardware
            //    event, call mWifiInfo.setRssi() with it, and call updateCapabilities(), and then
            //    re-arm the hardware event. This needs to be done on the state machine thread to
            //    avoid race conditions. The RSSI used to re-arm the event (and perhaps also the one
            //    sent in the NetworkCapabilities) must be the one received from the hardware event
            //    received, or we might skip callbacks.
            // 3. Ensure that when we disconnect, RSSI monitoring is stopped.
            log("Received signal strength thresholds: " + Arrays.toString(thresholds));
            if (thresholds.length == 0) {
                WifiStateMachine.this.sendMessage(CMD_STOP_RSSI_MONITORING_OFFLOAD,
                        mWifiInfo.getRssi());
                return;
            }
            int [] rssiVals = Arrays.copyOf(thresholds, thresholds.length + 2);
            rssiVals[rssiVals.length - 2] = Byte.MIN_VALUE;
            rssiVals[rssiVals.length - 1] = Byte.MAX_VALUE;
            Arrays.sort(rssiVals);
            byte[] rssiRange = new byte[rssiVals.length];
            for (int i = 0; i < rssiVals.length; i++) {
                int val = rssiVals[i];
                if (val <= Byte.MAX_VALUE && val >= Byte.MIN_VALUE) {
                    rssiRange[i] = (byte) val;
                } else {
                    Log.e(TAG, "Illegal value " + val + " for RSSI thresholds: "
                            + Arrays.toString(rssiVals));
                    WifiStateMachine.this.sendMessage(CMD_STOP_RSSI_MONITORING_OFFLOAD,
                            mWifiInfo.getRssi());
                    return;
                }
            }
            // TODO: Do we quash rssi values in this sorted array which are very close?
            mRssiRanges = rssiRange;
            WifiStateMachine.this.sendMessage(CMD_START_RSSI_MONITORING_OFFLOAD,
                    mWifiInfo.getRssi());
        }

        @Override
        protected void preventAutomaticReconnect() {
            if (this != mNetworkAgent) return;
            unwantedNetwork(NETWORK_STATUS_UNWANTED_DISABLE_AUTOJOIN);
        }
    }

    void unwantedNetwork(int reason) {
        sendMessage(CMD_UNWANTED_NETWORK, reason);
    }

    void doNetworkStatus(int status) {
        sendMessage(CMD_NETWORK_STATUS, status);
    }

    // rfc4186 & rfc4187:
    // create Permanent Identity base on IMSI,
    // identity = usernam@realm
    // with username = prefix | IMSI
    // and realm is derived MMC/MNC tuple according 3GGP spec(TS23.003)
    private String buildIdentity(int eapMethod, String imsi, String mccMnc) {
        String mcc;
        String mnc;
        String prefix;

        if (imsi == null || imsi.isEmpty())
            return "";

        if (eapMethod == WifiEnterpriseConfig.Eap.SIM)
            prefix = "1";
        else if (eapMethod == WifiEnterpriseConfig.Eap.AKA)
            prefix = "0";
        else if (eapMethod == WifiEnterpriseConfig.Eap.AKA_PRIME)
            prefix = "6";
        else  // not a valide EapMethod
            return "";

        /* extract mcc & mnc from mccMnc */
        if (mccMnc != null && !mccMnc.isEmpty()) {
            mcc = mccMnc.substring(0, 3);
            mnc = mccMnc.substring(3);
            if (mnc.length() == 2)
                mnc = "0" + mnc;
        } else {
            // extract mcc & mnc from IMSI, assume mnc size is 3
            mcc = imsi.substring(0, 3);
            mnc = imsi.substring(3, 6);
        }

        return prefix + imsi + "@wlan.mnc" + mnc + ".mcc" + mcc + ".3gppnetwork.org";
    }

    boolean startScanForConfiguration(WifiConfiguration config) {
        if (config == null)
            return false;

        // We are still seeing a fairly high power consumption triggered by autojoin scans
        // Hence do partial scans only for PSK configuration that are roamable since the
        // primary purpose of the partial scans is roaming.
        // Full badn scans with exponential backoff for the purpose or extended roaming and
        // network switching are performed unconditionally.
        ScanDetailCache scanDetailCache =
                mWifiConfigManager.getScanDetailCacheForNetwork(config.networkId);
        if (scanDetailCache == null
                || !config.allowedKeyManagement.get(WifiConfiguration.KeyMgmt.WPA_PSK)
                || scanDetailCache.size() > 6) {
            //return true but to not trigger the scan
            return true;
        }
        Set<Integer> freqs =
                mWifiConfigManager.fetchChannelSetForNetworkForPartialScan(
                        config.networkId, ONE_HOUR_MILLI, mWifiInfo.getFrequency());
        if (freqs != null && freqs.size() != 0) {
            //if (mVerboseLoggingEnabled) {
            logd("starting scan for " + config.configKey() + " with " + freqs);
            //}
            List<WifiScanner.ScanSettings.HiddenNetwork> hiddenNetworks = new ArrayList<>();
            if (config.hiddenSSID) {
                hiddenNetworks.add(new WifiScanner.ScanSettings.HiddenNetwork(config.SSID));
            }
            // Call wifi native to start the scan
            if (startScanNative(freqs, hiddenNetworks, WIFI_WORK_SOURCE)) {
                messageHandlingStatus = MESSAGE_HANDLING_STATUS_OK;
            } else {
                // used for debug only, mark scan as failed
                messageHandlingStatus = MESSAGE_HANDLING_STATUS_HANDLING_ERROR;
            }
            return true;
        } else {
            if (mVerboseLoggingEnabled) logd("no channels for " + config.configKey());
            return false;
        }
    }

    class L2ConnectedState extends State {
        @Override
        public void enter() {
            mRssiPollToken++;
            if (mEnableRssiPolling) {
                sendMessage(CMD_RSSI_POLL, mRssiPollToken, 0);
            }
            if (mNetworkAgent != null) {
                loge("Have NetworkAgent when entering L2Connected");
                setNetworkDetailedState(DetailedState.DISCONNECTED);
            }
            setNetworkDetailedState(DetailedState.CONNECTING);

            mNetworkAgent = new WifiNetworkAgent(getHandler().getLooper(), mContext,
                    "WifiNetworkAgent", mNetworkInfo, mNetworkCapabilitiesFilter,
                    mLinkProperties, 60, mNetworkMisc);

            // We must clear the config BSSID, as the wifi chipset may decide to roam
            // from this point on and having the BSSID specified in the network block would
            // cause the roam to faile and the device to disconnect
            clearTargetBssid("L2ConnectedState");
            mCountryCode.setReadyForChange(false);
            mWifiMetrics.setWifiState(WifiMetricsProto.WifiLog.WIFI_ASSOCIATED);
        }

        @Override
        public void exit() {
            mIpManager.stop();

            // This is handled by receiving a NETWORK_DISCONNECTION_EVENT in ConnectModeState
            // Bug: 15347363
            // For paranoia's sake, call handleNetworkDisconnect
            // only if BSSID is null or last networkId
            // is not invalid.
            if (mVerboseLoggingEnabled) {
                StringBuilder sb = new StringBuilder();
                sb.append("leaving L2ConnectedState state nid=" + Integer.toString(mLastNetworkId));
                if (mLastBssid !=null) {
                    sb.append(" ").append(mLastBssid);
                }
            }
            if (mLastBssid != null || mLastNetworkId != WifiConfiguration.INVALID_NETWORK_ID) {
                handleNetworkDisconnect();
            }
            mCountryCode.setReadyForChange(true);
            mWifiMetrics.setWifiState(WifiMetricsProto.WifiLog.WIFI_DISCONNECTED);
        }

        @Override
        public boolean processMessage(Message message) {
            logStateAndMessage(message, this);

            switch (message.what) {
                case DhcpClient.CMD_PRE_DHCP_ACTION:
                    handlePreDhcpSetup();
                    break;
                case DhcpClient.CMD_PRE_DHCP_ACTION_COMPLETE:
                    mIpManager.completedPreDhcpAction();
                    break;
                case DhcpClient.CMD_POST_DHCP_ACTION:
                    handlePostDhcpSetup();
                    // We advance to mConnectedState because IpManager will also send a
                    // CMD_IPV4_PROVISIONING_SUCCESS message, which calls handleIPv4Success(),
                    // which calls updateLinkProperties, which then sends
                    // CMD_IP_CONFIGURATION_SUCCESSFUL.
                    //
                    // In the event of failure, we transition to mDisconnectingState
                    // similarly--via messages sent back from IpManager.
                    break;
                case CMD_IPV4_PROVISIONING_SUCCESS: {
                    handleIPv4Success((DhcpResults) message.obj);
                    sendNetworkStateChangeBroadcast(mLastBssid);
                    break;
                }
                case CMD_IPV4_PROVISIONING_FAILURE: {
                    handleIPv4Failure();
                    break;
                }
                case CMD_IP_CONFIGURATION_SUCCESSFUL:
                    handleSuccessfulIpConfiguration();
                    reportConnectionAttemptEnd(
                            WifiMetrics.ConnectionEvent.FAILURE_NONE,
                            WifiMetricsProto.ConnectionEvent.HLF_NONE);
                    sendConnectedState();
                    transitionTo(mConnectedState);
                    break;
                case CMD_IP_CONFIGURATION_LOST:
                    // Get Link layer stats so that we get fresh tx packet counters.
                    getWifiLinkLayerStats();
                    handleIpConfigurationLost();
                    reportConnectionAttemptEnd(
                            WifiMetrics.ConnectionEvent.FAILURE_DHCP,
                            WifiMetricsProto.ConnectionEvent.HLF_NONE);
                    transitionTo(mDisconnectingState);
                    break;
                case CMD_IP_REACHABILITY_LOST:
                    if (mVerboseLoggingEnabled && message.obj != null) log((String) message.obj);
                    if (mIpReachabilityDisconnectEnabled) {
                        handleIpReachabilityLost();
                        transitionTo(mDisconnectingState);
                    } else {
                        logd("CMD_IP_REACHABILITY_LOST but disconnect disabled -- ignore");
                    }
                    break;
                case CMD_DISCONNECT:
                    mWifiNative.disconnect();
                    transitionTo(mDisconnectingState);
                    break;
                case WifiP2pServiceImpl.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;
                    /* Ignore connection to same network */
                case WifiManager.CONNECT_NETWORK:
                    int netId = message.arg1;
                    if (mWifiInfo.getNetworkId() == netId) {
                        replyToMessage(message, WifiManager.CONNECT_NETWORK_SUCCEEDED);
                        break;
                    }
                    return NOT_HANDLED;
                case WifiMonitor.NETWORK_CONNECTION_EVENT:
                    mWifiInfo.setBSSID((String) message.obj);
                    mLastNetworkId = lookupFrameworkNetworkId(message.arg1);
                    mWifiInfo.setNetworkId(mLastNetworkId);
                    if(!mLastBssid.equals(message.obj)) {
                        mLastBssid = (String) message.obj;
                        sendNetworkStateChangeBroadcast(mLastBssid);
                    }
                    break;
                case CMD_RSSI_POLL:
                    if (message.arg1 == mRssiPollToken) {
                        if (mEnableChipWakeUpWhenAssociated) {
                            if (mVerboseLoggingEnabled) {
                                log(" get link layer stats " + mWifiLinkLayerStatsSupported);
                            }
                            WifiLinkLayerStats stats = getWifiLinkLayerStats();
                            if (stats != null) {
                                // Sanity check the results provided by driver
                                if (mWifiInfo.getRssi() != WifiInfo.INVALID_RSSI
                                        && (stats.rssi_mgmt == 0
                                        || stats.beacon_rx == 0)) {
                                    stats = null;
                                }
                            }
                            // Get Info and continue polling
                            fetchRssiLinkSpeedAndFrequencyNative();
                            // Send the update score to network agent.
                            mWifiScoreReport.calculateAndReportScore(
                                    mWifiInfo, mNetworkAgent, mAggressiveHandover,
                                    mWifiMetrics);
                        }
                        sendMessageDelayed(obtainMessage(CMD_RSSI_POLL,
                                mRssiPollToken, 0), POLL_RSSI_INTERVAL_MSECS);
                        if (mVerboseLoggingEnabled) sendRssiChangeBroadcast(mWifiInfo.getRssi());
                    } else {
                        // Polling has completed
                    }
                    break;
                case CMD_ENABLE_RSSI_POLL:
                    cleanWifiScore();
                    if (mEnableRssiPollWhenAssociated) {
                        mEnableRssiPolling = (message.arg1 == 1);
                    } else {
                        mEnableRssiPolling = false;
                    }
                    mRssiPollToken++;
                    if (mEnableRssiPolling) {
                        // First poll
                        fetchRssiLinkSpeedAndFrequencyNative();
                        sendMessageDelayed(obtainMessage(CMD_RSSI_POLL,
                                mRssiPollToken, 0), POLL_RSSI_INTERVAL_MSECS);
                    }
                    break;
                case WifiManager.RSSI_PKTCNT_FETCH:
                    RssiPacketCountInfo info = new RssiPacketCountInfo();
                    fetchRssiLinkSpeedAndFrequencyNative();
                    info.rssi = mWifiInfo.getRssi();
                    WifiNative.TxPacketCounters counters = mWifiNative.getTxPacketCounters();
                    if (counters != null) {
                        info.txgood = counters.txSucceeded;
                        info.txbad = counters.txFailed;
                        replyToMessage(message, WifiManager.RSSI_PKTCNT_FETCH_SUCCEEDED, info);
                    } else {
                        replyToMessage(message,
                                WifiManager.RSSI_PKTCNT_FETCH_FAILED, WifiManager.ERROR);
                    }
                    break;
                case CMD_DELAYED_NETWORK_DISCONNECT:
                    if (!isLinkDebouncing()) {

                        // Ignore if we are not debouncing
                        logd("CMD_DELAYED_NETWORK_DISCONNECT and not debouncing - ignore "
                                + message.arg1);
                        return HANDLED;
                    } else {
                        logd("CMD_DELAYED_NETWORK_DISCONNECT and debouncing - disconnect "
                                + message.arg1);

                        mIsLinkDebouncing = false;
                        // If we are still debouncing while this message comes,
                        // it means we were not able to reconnect within the alloted time
                        // = LINK_FLAPPING_DEBOUNCE_MSEC
                        // and thus, trigger a real disconnect
                        handleNetworkDisconnect();
                        transitionTo(mDisconnectedState);
                    }
                    break;
                case CMD_ASSOCIATED_BSSID:
                    if ((String) message.obj == null) {
                        logw("Associated command w/o BSSID");
                        break;
                    }
                    mLastBssid = (String) message.obj;
                    if (mLastBssid != null && (mWifiInfo.getBSSID() == null
                            || !mLastBssid.equals(mWifiInfo.getBSSID()))) {
                        mWifiInfo.setBSSID((String) message.obj);
                        sendNetworkStateChangeBroadcast(mLastBssid);
                    }
                    break;
                case CMD_START_RSSI_MONITORING_OFFLOAD:
                case CMD_RSSI_THRESHOLD_BREACH:
                    byte currRssi = (byte) message.arg1;
                    processRssiThreshold(currRssi, message.what);
                    break;
                case CMD_STOP_RSSI_MONITORING_OFFLOAD:
                    stopRssiMonitoringOffload();
                    break;
                case CMD_RESET_SIM_NETWORKS:
                    if (message.arg1 == 0 // sim was removed
                            && mLastNetworkId != WifiConfiguration.INVALID_NETWORK_ID) {
                        WifiConfiguration config =
                                mWifiConfigManager.getConfiguredNetwork(mLastNetworkId);
                        if (TelephonyUtil.isSimConfig(config)) {
                            mWifiNative.disconnect();
                            transitionTo(mDisconnectingState);
                        }
                    }
                    /* allow parent state to reset data for other networks */
                    return NOT_HANDLED;
                default:
                    return NOT_HANDLED;
            }

            return HANDLED;
        }
    }

    class ObtainingIpState extends State {
        @Override
        public void enter() {
            WifiConfiguration currentConfig = getCurrentWifiConfiguration();
            boolean isUsingStaticIp =
                    (currentConfig.getIpAssignment() == IpConfiguration.IpAssignment.STATIC);
            if (mVerboseLoggingEnabled) {
                String key = "";
                if (getCurrentWifiConfiguration() != null) {
                    key = getCurrentWifiConfiguration().configKey();
                }
                log("enter ObtainingIpState netId=" + Integer.toString(mLastNetworkId)
                        + " " + key + " "
                        + " roam=" + mAutoRoaming
                        + " static=" + isUsingStaticIp);
            }

            // Reset link Debouncing, indicating we have successfully re-connected to the AP
            // We might still be roaming
            mIsLinkDebouncing = false;

            // Send event to CM & network change broadcast
            setNetworkDetailedState(DetailedState.OBTAINING_IPADDR);

            // We must clear the config BSSID, as the wifi chipset may decide to roam
            // from this point on and having the BSSID specified in the network block would
            // cause the roam to fail and the device to disconnect.
            clearTargetBssid("ObtainingIpAddress");

            // Stop IpManager in case we're switching from DHCP to static
            // configuration or vice versa.
            //
            // TODO: Only ever enter this state the first time we connect to a
            // network, never on switching between static configuration and
            // DHCP. When we transition from static configuration to DHCP in
            // particular, we must tell ConnectivityService that we're
            // disconnected, because DHCP might take a long time during which
            // connectivity APIs such as getActiveNetworkInfo should not return
            // CONNECTED.
            stopIpManager();

            mIpManager.setHttpProxy(currentConfig.getHttpProxy());
            if (!TextUtils.isEmpty(mTcpBufferSizes)) {
                mIpManager.setTcpBufferSizes(mTcpBufferSizes);
            }

            if (!isUsingStaticIp) {
                final IpManager.ProvisioningConfiguration prov =
                        IpManager.buildProvisioningConfiguration()
                            .withPreDhcpAction()
                            .withApfCapabilities(mWifiNative.getApfCapabilities())
                            .build();
                mIpManager.startProvisioning(prov);
                // Get Link layer stats so as we get fresh tx packet counters
                getWifiLinkLayerStats();
            } else {
                StaticIpConfiguration config = currentConfig.getStaticIpConfiguration();
                if (config.ipAddress == null) {
                    logd("Static IP lacks address");
                    sendMessage(CMD_IPV4_PROVISIONING_FAILURE);
                } else {
                    final IpManager.ProvisioningConfiguration prov =
                            IpManager.buildProvisioningConfiguration()
                                .withStaticConfiguration(config)
                                .withApfCapabilities(mWifiNative.getApfCapabilities())
                                .build();
                    mIpManager.startProvisioning(prov);
                }
            }
        }

        @Override
        public boolean processMessage(Message message) {
            logStateAndMessage(message, this);

            switch(message.what) {
                case CMD_START_CONNECT:
                case CMD_START_ROAM:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DISCARD;
                    break;
                case WifiManager.SAVE_NETWORK:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DEFERRED;
                    deferMessage(message);
                    break;
                case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                    reportConnectionAttemptEnd(
                            WifiMetrics.ConnectionEvent.FAILURE_NETWORK_DISCONNECTION,
                            WifiMetricsProto.ConnectionEvent.HLF_NONE);
                    return NOT_HANDLED;
                case CMD_SET_HIGH_PERF_MODE:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DEFERRED;
                    deferMessage(message);
                    break;
                    /* Defer scan request since we should not switch to other channels at DHCP */
                case CMD_START_SCAN:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DEFERRED;
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }
    }

    private void sendConnectedState() {
        // If this network was explicitly selected by the user, evaluate whether to call
        // explicitlySelected() so the system can treat it appropriately.
        WifiConfiguration config = getCurrentWifiConfiguration();
        if (mWifiConfigManager.getLastSelectedNetwork() == config.networkId) {
            boolean prompt =
                    mWifiConfigManager.checkConfigOverridePermission(config.lastConnectUid);
            if (mVerboseLoggingEnabled) {
                log("Network selected by UID " + config.lastConnectUid + " prompt=" + prompt);
            }
            if (prompt) {
                // Selected by the user via Settings or QuickSettings. If this network has Internet
                // access, switch to it. Otherwise, switch to it only if the user confirms that they
                // really want to switch, or has already confirmed and selected "Don't ask again".
                if (mVerboseLoggingEnabled) {
                    log("explictlySelected acceptUnvalidated=" + config.noInternetAccessExpected);
                }
                mNetworkAgent.explicitlySelected(config.noInternetAccessExpected);
            }
        }

        setNetworkDetailedState(DetailedState.CONNECTED);
        mWifiConfigManager.updateNetworkAfterConnect(mLastNetworkId);
        sendNetworkStateChangeBroadcast(mLastBssid);
    }

    class RoamingState extends State {
        boolean mAssociated;
        @Override
        public void enter() {
            if (mVerboseLoggingEnabled) {
                log("RoamingState Enter"
                        + " mScreenOn=" + mScreenOn );
            }

            // Make sure we disconnect if roaming fails
            roamWatchdogCount++;
            logd("Start Roam Watchdog " + roamWatchdogCount);
            sendMessageDelayed(obtainMessage(CMD_ROAM_WATCHDOG_TIMER,
                    roamWatchdogCount, 0), ROAM_GUARD_TIMER_MSEC);
            mAssociated = false;
        }
        @Override
        public boolean processMessage(Message message) {
            logStateAndMessage(message, this);
            WifiConfiguration config;
            switch (message.what) {
                case CMD_IP_CONFIGURATION_LOST:
                    config = getCurrentWifiConfiguration();
                    if (config != null) {
                        mWifiDiagnostics.captureBugReportData(
                                WifiDiagnostics.REPORT_REASON_AUTOROAM_FAILURE);
                    }
                    return NOT_HANDLED;
                case CMD_UNWANTED_NETWORK:
                    if (mVerboseLoggingEnabled) {
                        log("Roaming and CS doesnt want the network -> ignore");
                    }
                    return HANDLED;
                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 indicating a DISCONNECT
                     * before NETWORK_DISCONNECTION_EVENT
                     * And there is an associated BSSID corresponding to our target BSSID, then
                     * we have missed the network disconnection, transition to mDisconnectedState
                     * and handle the rest of the events there.
                     */
                    StateChangeResult stateChangeResult = (StateChangeResult) message.obj;
                    if (stateChangeResult.state == SupplicantState.DISCONNECTED
                            || stateChangeResult.state == SupplicantState.INACTIVE
                            || stateChangeResult.state == SupplicantState.INTERFACE_DISABLED) {
                        if (mVerboseLoggingEnabled) {
                            log("STATE_CHANGE_EVENT in roaming state "
                                    + stateChangeResult.toString() );
                        }
                        if (stateChangeResult.BSSID != null
                                && stateChangeResult.BSSID.equals(mTargetRoamBSSID)) {
                            handleNetworkDisconnect();
                            transitionTo(mDisconnectedState);
                        }
                    }
                    if (stateChangeResult.state == SupplicantState.ASSOCIATED) {
                        // We completed the layer2 roaming part
                        mAssociated = true;
                        if (stateChangeResult.BSSID != null) {
                            mTargetRoamBSSID = stateChangeResult.BSSID;
                        }
                    }
                    break;
                case CMD_ROAM_WATCHDOG_TIMER:
                    if (roamWatchdogCount == message.arg1) {
                        if (mVerboseLoggingEnabled) log("roaming watchdog! -> disconnect");
                        mWifiMetrics.endConnectionEvent(
                                WifiMetrics.ConnectionEvent.FAILURE_ROAM_TIMEOUT,
                                WifiMetricsProto.ConnectionEvent.HLF_NONE);
                        mRoamFailCount++;
                        handleNetworkDisconnect();
                        mWifiNative.disconnect();
                        transitionTo(mDisconnectedState);
                    }
                    break;
                case WifiMonitor.NETWORK_CONNECTION_EVENT:
                    if (mAssociated) {
                        if (mVerboseLoggingEnabled) {
                            log("roaming and Network connection established");
                        }
                        mLastNetworkId = lookupFrameworkNetworkId(message.arg1);
                        mLastBssid = (String) message.obj;
                        mWifiInfo.setBSSID(mLastBssid);
                        mWifiInfo.setNetworkId(mLastNetworkId);
                        int reasonCode = message.arg2;
                        mWifiConnectivityManager.trackBssid(mLastBssid, true, reasonCode);
                        sendNetworkStateChangeBroadcast(mLastBssid);

                        // Successful framework roam! (probably)
                        reportConnectionAttemptEnd(
                                WifiMetrics.ConnectionEvent.FAILURE_NONE,
                                WifiMetricsProto.ConnectionEvent.HLF_NONE);

                        // We must clear the config BSSID, as the wifi chipset may decide to roam
                        // from this point on and having the BSSID specified by QNS would cause
                        // the roam to fail and the device to disconnect.
                        // When transition from RoamingState to DisconnectingState or
                        // DisconnectedState, the config BSSID is cleared by
                        // handleNetworkDisconnect().
                        clearTargetBssid("RoamingCompleted");

                        // We used to transition to ObtainingIpState in an
                        // attempt to do DHCPv4 RENEWs on framework roams.
                        // DHCP can take too long to time out, and we now rely
                        // upon IpManager's use of IpReachabilityMonitor to
                        // confirm our current network configuration.
                        //
                        // mIpManager.confirmConfiguration() is called within
                        // the handling of SupplicantState.COMPLETED.
                        transitionTo(mConnectedState);
                    } else {
                        messageHandlingStatus = MESSAGE_HANDLING_STATUS_DISCARD;
                    }
                    break;
                case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                    // Throw away but only if it corresponds to the network we're roaming to
                    String bssid = (String) message.obj;
                    if (true) {
                        String target = "";
                        if (mTargetRoamBSSID != null) target = mTargetRoamBSSID;
                        log("NETWORK_DISCONNECTION_EVENT in roaming state"
                                + " BSSID=" + bssid
                                + " target=" + target);
                    }
                    if (bssid != null && bssid.equals(mTargetRoamBSSID)) {
                        handleNetworkDisconnect();
                        transitionTo(mDisconnectedState);
                    }
                    break;
                case WifiMonitor.SSID_TEMP_DISABLED:
                    // Auth error while roaming
                    int netId = lookupFrameworkNetworkId(message.arg1);
                    logd("SSID_TEMP_DISABLED nid=" + Integer.toString(mLastNetworkId)
                            + " id=" + netId
                            + " isRoaming=" + isRoaming()
                            + " roam=" + mAutoRoaming);
                    if (netId == mLastNetworkId) {
                        config = getCurrentWifiConfiguration();
                        if (config != null) {
                            mWifiDiagnostics.captureBugReportData(
                                    WifiDiagnostics.REPORT_REASON_AUTOROAM_FAILURE);
                        }
                        handleNetworkDisconnect();
                        transitionTo(mDisconnectingState);
                    }
                    return NOT_HANDLED;
                case CMD_START_SCAN:
                    deferMessage(message);
                    break;
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }

        @Override
        public void exit() {
            logd("WifiStateMachine: Leaving Roaming state");
        }
    }

    class ConnectedState extends State {
        @Override
        public void enter() {
            updateDefaultRouteMacAddress(1000);
            if (mVerboseLoggingEnabled) {
                log("Enter ConnectedState "
                       + " mScreenOn=" + mScreenOn);
            }

            mWifiConnectivityManager.handleConnectionStateChanged(
                    WifiConnectivityManager.WIFI_STATE_CONNECTED);
            registerConnected();
            lastConnectAttemptTimestamp = 0;
            targetWificonfiguration = null;
            // Paranoia
            mIsLinkDebouncing = false;

            // Not roaming anymore
            mAutoRoaming = false;

            if (testNetworkDisconnect) {
                testNetworkDisconnectCounter++;
                logd("ConnectedState Enter start disconnect test " +
                        testNetworkDisconnectCounter);
                sendMessageDelayed(obtainMessage(CMD_TEST_NETWORK_DISCONNECT,
                        testNetworkDisconnectCounter, 0), 15000);
            }

            mLastDriverRoamAttempt = 0;
            mTargetNetworkId = WifiConfiguration.INVALID_NETWORK_ID;
            mWifiInjector.getWifiLastResortWatchdog().connectedStateTransition(true);
            mWifiStateTracker.updateState(WifiStateTracker.CONNECTED);
        }
        @Override
        public boolean processMessage(Message message) {
            WifiConfiguration config = null;
            logStateAndMessage(message, this);

            switch (message.what) {
                case CMD_UNWANTED_NETWORK:
                    if (message.arg1 == NETWORK_STATUS_UNWANTED_DISCONNECT) {
                        mWifiNative.disconnect();
                        transitionTo(mDisconnectingState);
                    } else if (message.arg1 == NETWORK_STATUS_UNWANTED_DISABLE_AUTOJOIN ||
                            message.arg1 == NETWORK_STATUS_UNWANTED_VALIDATION_FAILED) {
                        Log.d(TAG, (message.arg1 == NETWORK_STATUS_UNWANTED_DISABLE_AUTOJOIN
                                ? "NETWORK_STATUS_UNWANTED_DISABLE_AUTOJOIN"
                                : "NETWORK_STATUS_UNWANTED_VALIDATION_FAILED"));
                        config = getCurrentWifiConfiguration();
                        if (config != null) {
                            // Disable autojoin
                            if (message.arg1 == NETWORK_STATUS_UNWANTED_DISABLE_AUTOJOIN) {
                                mWifiConfigManager.setNetworkValidatedInternetAccess(
                                        config.networkId, false);
                                mWifiConfigManager.updateNetworkSelectionStatus(config.networkId,
                                        WifiConfiguration.NetworkSelectionStatus
                                        .DISABLED_NO_INTERNET);
                            }
                            mWifiConfigManager.incrementNetworkNoInternetAccessReports(
                                    config.networkId);
                        }
                    }
                    return HANDLED;
                case CMD_NETWORK_STATUS:
                    if (message.arg1 == NetworkAgent.VALID_NETWORK) {
                        config = getCurrentWifiConfiguration();
                        if (config != null) {
                            // re-enable autojoin
                            mWifiConfigManager.setNetworkValidatedInternetAccess(
                                    config.networkId, true);
                        }
                    }
                    return HANDLED;
                case CMD_ACCEPT_UNVALIDATED:
                    boolean accept = (message.arg1 != 0);
                    mWifiConfigManager.setNetworkNoInternetAccessExpected(mLastNetworkId, accept);
                    return HANDLED;
                case CMD_TEST_NETWORK_DISCONNECT:
                    // Force a disconnect
                    if (message.arg1 == testNetworkDisconnectCounter) {
                        mWifiNative.disconnect();
                    }
                    break;
                case CMD_ASSOCIATED_BSSID:
                    // ASSOCIATING to a new BSSID while already connected, indicates
                    // that driver is roaming
                    mLastDriverRoamAttempt = mClock.getWallClockMillis();
                    return NOT_HANDLED;
                case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                    long lastRoam = 0;
                    reportConnectionAttemptEnd(
                            WifiMetrics.ConnectionEvent.FAILURE_NETWORK_DISCONNECTION,
                            WifiMetricsProto.ConnectionEvent.HLF_NONE);
                    if (mLastDriverRoamAttempt != 0) {
                        // Calculate time since last driver roam attempt
                        lastRoam = mClock.getWallClockMillis() - mLastDriverRoamAttempt;
                        mLastDriverRoamAttempt = 0;
                    }
                    if (unexpectedDisconnectedReason(message.arg2)) {
                        mWifiDiagnostics.captureBugReportData(
                                WifiDiagnostics.REPORT_REASON_UNEXPECTED_DISCONNECT);
                    }
                    config = getCurrentWifiConfiguration();
                    if (mEnableLinkDebouncing
                            && mScreenOn
                            && !isLinkDebouncing()
                            && config != null
                            && config.getNetworkSelectionStatus().isNetworkEnabled()
                            && config.networkId != mWifiConfigManager.getLastSelectedNetwork()
                            && (message.arg2 != 3 /* reason cannot be 3, i.e. locally generated */
                                || (lastRoam > 0 && lastRoam < 2000) /* unless driver is roaming */)
                            && ((ScanResult.is24GHz(mWifiInfo.getFrequency())
                                    && mWifiInfo.getRssi() >
                                     mThresholdQualifiedRssi5)
                                    || (ScanResult.is5GHz(mWifiInfo.getFrequency())
                                    && mWifiInfo.getRssi() >
                                    mThresholdQualifiedRssi5))) {
                        // Start de-bouncing the L2 disconnection:
                        // this L2 disconnection might be spurious.
                        // Hence we allow 4 seconds for the state machine to try
                        // to reconnect, go thru the
                        // roaming cycle and enter Obtaining IP address
                        // before signalling the disconnect to ConnectivityService and L3
                        startScanForConfiguration(getCurrentWifiConfiguration());
                        mIsLinkDebouncing = true;

                        sendMessageDelayed(obtainMessage(CMD_DELAYED_NETWORK_DISCONNECT,
                                0, mLastNetworkId), LINK_FLAPPING_DEBOUNCE_MSEC);
                        if (mVerboseLoggingEnabled) {
                            log("NETWORK_DISCONNECTION_EVENT in connected state"
                                    + " BSSID=" + mWifiInfo.getBSSID()
                                    + " RSSI=" + mWifiInfo.getRssi()
                                    + " freq=" + mWifiInfo.getFrequency()
                                    + " reason=" + message.arg2
                                    + " -> debounce");
                        }
                        return HANDLED;
                    } else {
                        if (mVerboseLoggingEnabled) {
                            log("NETWORK_DISCONNECTION_EVENT in connected state"
                                    + " BSSID=" + mWifiInfo.getBSSID()
                                    + " RSSI=" + mWifiInfo.getRssi()
                                    + " freq=" + mWifiInfo.getFrequency()
                                    + " was debouncing=" + isLinkDebouncing()
                                    + " reason=" + message.arg2
                                    + " Network Selection Status=" + (config == null ? "Unavailable"
                                    : config.getNetworkSelectionStatus().getNetworkStatusString()));
                        }
                    }
                    break;
                case CMD_START_ROAM:
                    // Clear the driver roam indication since we are attempting a framework roam
                    mLastDriverRoamAttempt = 0;

                    /* Connect command coming from auto-join */
                    int netId = message.arg1;
                    ScanResult candidate = (ScanResult)message.obj;
                    String bssid = SUPPLICANT_BSSID_ANY;
                    if (candidate != null) {
                        bssid = candidate.BSSID;
                    }
                    config = mWifiConfigManager.getConfiguredNetworkWithPassword(netId);
                    if (config == null) {
                        loge("CMD_START_ROAM and no config, bail out...");
                        break;
                    }

                    setTargetBssid(config, bssid);
                    mTargetNetworkId = netId;

                    logd("CMD_START_ROAM sup state "
                            + mSupplicantStateTracker.getSupplicantStateName()
                            + " my state " + getCurrentState().getName()
                            + " nid=" + Integer.toString(netId)
                            + " config " + config.configKey()
                            + " targetRoamBSSID " + mTargetRoamBSSID);

                    reportConnectionAttemptStart(config, mTargetRoamBSSID,
                            WifiMetricsProto.ConnectionEvent.ROAM_ENTERPRISE);
                    if (mWifiNative.roamToNetwork(config)) {
                        lastConnectAttemptTimestamp = mClock.getWallClockMillis();
                        targetWificonfiguration = config;
                        mAutoRoaming = true;
                        transitionTo(mRoamingState);
                    } else {
                        loge("CMD_START_ROAM Failed to start roaming to network " + config);
                        reportConnectionAttemptEnd(
                                WifiMetrics.ConnectionEvent.FAILURE_CONNECT_NETWORK_FAILED,
                                WifiMetricsProto.ConnectionEvent.HLF_NONE);
                        replyToMessage(message, WifiManager.CONNECT_NETWORK_FAILED,
                                WifiManager.ERROR);
                        messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
                        break;
                    }
                    break;
                case CMD_START_IP_PACKET_OFFLOAD: {
                    int slot = message.arg1;
                    int intervalSeconds = message.arg2;
                    KeepalivePacketData pkt = (KeepalivePacketData) message.obj;
                    byte[] dstMac;
                    try {
                        InetAddress gateway = RouteInfo.selectBestRoute(
                                mLinkProperties.getRoutes(), pkt.dstAddress).getGateway();
                        String dstMacStr = macAddressFromRoute(gateway.getHostAddress());
                        dstMac = NativeUtil.macAddressToByteArray(dstMacStr);
                    } catch (NullPointerException | IllegalArgumentException e) {
                        loge("Can't find MAC address for next hop to " + pkt.dstAddress);
                        mNetworkAgent.onPacketKeepaliveEvent(slot,
                                ConnectivityManager.PacketKeepalive.ERROR_INVALID_IP_ADDRESS);
                        break;
                    }
                    pkt.dstMac = dstMac;
                    int result = startWifiIPPacketOffload(slot, pkt, intervalSeconds);
                    mNetworkAgent.onPacketKeepaliveEvent(slot, result);
                    break;
                }
                default:
                    return NOT_HANDLED;
            }
            return HANDLED;
        }

        @Override
        public void exit() {
            logd("WifiStateMachine: Leaving Connected state");
            mWifiConnectivityManager.handleConnectionStateChanged(
                     WifiConnectivityManager.WIFI_STATE_TRANSITIONING);

            mLastDriverRoamAttempt = 0;
            mWifiInjector.getWifiLastResortWatchdog().connectedStateTransition(false);
        }
    }

    class DisconnectingState extends State {

        @Override
        public void enter() {

            if (mVerboseLoggingEnabled) {
                logd(" Enter DisconnectingState State screenOn=" + mScreenOn);
            }

            // Make sure we disconnect: we enter this state prior to connecting to a new
            // network, waiting for either a DISCONNECT event or a SUPPLICANT_STATE_CHANGE
            // event which in this case will be indicating that supplicant started to associate.
            // In some cases supplicant doesn't ignore the connect requests (it might not
            // find the target SSID in its cache),
            // Therefore we end up stuck that state, hence the need for the watchdog.
            disconnectingWatchdogCount++;
            logd("Start Disconnecting Watchdog " + disconnectingWatchdogCount);
            sendMessageDelayed(obtainMessage(CMD_DISCONNECTING_WATCHDOG_TIMER,
                    disconnectingWatchdogCount, 0), DISCONNECTING_GUARD_TIMER_MSEC);
        }

        @Override
        public boolean processMessage(Message message) {
            logStateAndMessage(message, this);
            switch (message.what) {
                case CMD_SET_OPERATIONAL_MODE:
                    if (message.arg1 != CONNECT_MODE) {
                        deferMessage(message);
                    }
                    break;
                case CMD_START_SCAN:
                    deferMessage(message);
                    return HANDLED;
                case CMD_DISCONNECT:
                    if (mVerboseLoggingEnabled) log("Ignore CMD_DISCONNECT when already disconnecting.");
                    break;
                case CMD_DISCONNECTING_WATCHDOG_TIMER:
                    if (disconnectingWatchdogCount == message.arg1) {
                        if (mVerboseLoggingEnabled) log("disconnecting watchdog! -> disconnect");
                        handleNetworkDisconnect();
                        transitionTo(mDisconnectedState);
                    }
                    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 {
        @Override
        public void enter() {
            // We dont scan frequently if this is a temporary disconnect
            // due to p2p
            if (mTemporarilyDisconnectWifi) {
                p2pSendMessage(WifiP2pServiceImpl.DISCONNECT_WIFI_RESPONSE);
                return;
            }

            if (mVerboseLoggingEnabled) {
                logd(" Enter DisconnectedState screenOn=" + mScreenOn);
            }

            /** clear the roaming state, if we were roaming, we failed */
            mAutoRoaming = false;

            mWifiConnectivityManager.handleConnectionStateChanged(
                    WifiConnectivityManager.WIFI_STATE_DISCONNECTED);

            /**
             * 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 (mNoNetworksPeriodicScan != 0 && !mP2pConnected.get()
                    && mWifiConfigManager.getSavedNetworks().size() == 0) {
                sendMessageDelayed(obtainMessage(CMD_NO_NETWORKS_PERIODIC_SCAN,
                        ++mPeriodicScanToken, 0), mNoNetworksPeriodicScan);
            }

            mDisconnectedTimeStamp = mClock.getWallClockMillis();
            mWifiStateTracker.updateState(WifiStateTracker.DISCONNECTED);
        }
        @Override
        public boolean processMessage(Message message) {
            boolean ret = HANDLED;

            logStateAndMessage(message, this);

            switch (message.what) {
                case CMD_NO_NETWORKS_PERIODIC_SCAN:
                    if (mP2pConnected.get()) break;
                    if (mNoNetworksPeriodicScan != 0 && message.arg1 == mPeriodicScanToken &&
                            mWifiConfigManager.getSavedNetworks().size() == 0) {
                        startScan(UNKNOWN_SCAN_SOURCE, -1, null, WIFI_WORK_SOURCE);
                        sendMessageDelayed(obtainMessage(CMD_NO_NETWORKS_PERIODIC_SCAN,
                                    ++mPeriodicScanToken, 0), mNoNetworksPeriodicScan);
                    }
                    break;
                case WifiManager.FORGET_NETWORK:
                case CMD_REMOVE_NETWORK:
                case CMD_REMOVE_APP_CONFIGURATIONS:
                case CMD_REMOVE_USER_CONFIGURATIONS:
                    // 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), mNoNetworksPeriodicScan);
                    ret = NOT_HANDLED;
                    break;
                case CMD_SET_OPERATIONAL_MODE:
                    if (message.arg1 != CONNECT_MODE) {
                        mOperationalMode = message.arg1;
                        if (mOperationalMode == DISABLED_MODE) {
                            transitionTo(mSupplicantStoppingState);
                        } else if (mOperationalMode == SCAN_ONLY_MODE
                                || mOperationalMode == SCAN_ONLY_WITH_WIFI_OFF_MODE) {
                            p2pSendMessage(CMD_DISABLE_P2P_REQ);
                            setWifiState(WIFI_STATE_DISABLED);
                            transitionTo(mScanModeState);
                        }
                    }
                    break;
                case CMD_DISCONNECT:
                    mWifiNative.disconnect();
                    break;
                /* Ignore network disconnect */
                case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                    // Interpret this as an L2 connection failure
                    break;
                case WifiMonitor.SUPPLICANT_STATE_CHANGE_EVENT:
                    StateChangeResult stateChangeResult = (StateChangeResult) message.obj;
                    if (mVerboseLoggingEnabled) {
                        logd("SUPPLICANT_STATE_CHANGE_EVENT state=" + stateChangeResult.state +
                                " -> state= " + WifiInfo.getDetailedStateOf(stateChangeResult.state)
                                + " debouncing=" + isLinkDebouncing());
                    }
                    setNetworkDetailedState(WifiInfo.getDetailedStateOf(stateChangeResult.state));
                    /* ConnectModeState does the rest of the handling */
                    ret = NOT_HANDLED;
                    break;
                case CMD_START_SCAN:
                    if (!checkOrDeferScanAllowed(message)) {
                        // The scan request was rescheduled
                        messageHandlingStatus = MESSAGE_HANDLING_STATUS_REFUSED;
                        return HANDLED;
                    }

                    ret = NOT_HANDLED;
                    break;
                case WifiP2pServiceImpl.P2P_CONNECTION_CHANGED:
                    NetworkInfo info = (NetworkInfo) message.obj;
                    mP2pConnected.set(info.isConnected());
                    if (!mP2pConnected.get() && mWifiConfigManager.getSavedNetworks().size() == 0) {
                        if (mVerboseLoggingEnabled) log("Turn on scanning after p2p disconnected");
                        sendMessageDelayed(obtainMessage(CMD_NO_NETWORKS_PERIODIC_SCAN,
                                    ++mPeriodicScanToken, 0), mNoNetworksPeriodicScan);
                    }
                    break;
                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;
                case CMD_SCREEN_STATE_CHANGED:
                    handleScreenStateChanged(message.arg1 != 0);
                    break;
                default:
                    ret = NOT_HANDLED;
            }
            return ret;
        }

        @Override
        public void exit() {
            mWifiConnectivityManager.handleConnectionStateChanged(
                     WifiConnectivityManager.WIFI_STATE_TRANSITIONING);
        }
    }

    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) {
            logStateAndMessage(message, this);

            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
                    if ((message.arg1 != WifiManager.ERROR) || (message.arg2 != 0)) {
                        replyToMessage(mSourceMessage, WifiManager.WPS_FAILED, message.arg1);
                        mSourceMessage.recycle();
                        mSourceMessage = null;
                        transitionTo(mDisconnectedState);
                    } else {
                        if (mVerboseLoggingEnabled) {
                            log("Ignore unspecified fail event during WPS connection");
                        }
                    }
                    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_SET_OPERATIONAL_MODE:
                case WifiManager.CONNECT_NETWORK:
                case CMD_ENABLE_NETWORK:
                case CMD_RECONNECT:
                case CMD_REASSOCIATE:
                    deferMessage(message);
                    break;
                case CMD_START_CONNECT:
                case CMD_START_ROAM:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DISCARD;
                    return HANDLED;
                case CMD_START_SCAN:
                    messageHandlingStatus = MESSAGE_HANDLING_STATUS_DISCARD;
                    return HANDLED;
                case WifiMonitor.NETWORK_DISCONNECTION_EVENT:
                    if (mVerboseLoggingEnabled) log("Network connection lost");
                    handleNetworkDisconnect();
                    break;
                case WifiMonitor.ASSOCIATION_REJECTION_EVENT:
                    if (mVerboseLoggingEnabled) {
                        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 (mVerboseLoggingEnabled) 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() {
            mWifiConfigManager.loadFromStore();
        }
    }

    class SoftApState extends State {
        private SoftApManager mSoftApManager;

        private class SoftApListener implements SoftApManager.Listener {
            @Override
            public void onStateChanged(int state, int reason) {
                if (state == WIFI_AP_STATE_DISABLED) {
                    sendMessage(CMD_AP_STOPPED);
                } else if (state == WIFI_AP_STATE_FAILED) {
                    sendMessage(CMD_START_AP_FAILURE);
                }

                setWifiApState(state, reason);
            }
        }

        @Override
        public void enter() {
            final Message message = getCurrentMessage();
            if (message.what != CMD_START_AP) {
                throw new RuntimeException("Illegal transition to SoftApState: " + message);
            }

            IApInterface apInterface = mWifiNative.setupDriverForSoftApMode();
            if (apInterface == null) {
                setWifiApState(WIFI_AP_STATE_FAILED,
                        WifiManager.SAP_START_FAILURE_GENERAL);
                /**
                 * Transition to InitialState to reset the
                 * driver/HAL back to the initial state.
                 */
                transitionTo(mInitialState);
                return;
            }

            WifiConfiguration config = (WifiConfiguration) message.obj;

            checkAndSetConnectivityInstance();
            mSoftApManager = mWifiInjector.makeSoftApManager(mNwService,
                                                             new SoftApListener(),
                                                             apInterface,
                                                             config);
            mSoftApManager.start();
            mWifiStateTracker.updateState(WifiStateTracker.SOFT_AP);
        }

        @Override
        public void exit() {
            mSoftApManager = null;
        }

        @Override
        public boolean processMessage(Message message) {
            logStateAndMessage(message, this);

            switch(message.what) {
                case CMD_START_AP:
                    /* Ignore start command when it is starting/started. */
                    break;
                case CMD_STOP_AP:
                    mSoftApManager.stop();
                    break;
                case CMD_START_AP_FAILURE:
                    transitionTo(mInitialState);
                    break;
                case CMD_AP_STOPPED:
                    transitionTo(mInitialState);
                    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 = obtainMessageWithWhatAndArg2(msg, what);
        mReplyChannel.replyToMessage(msg, dstMsg);
    }

    private void replyToMessage(Message msg, int what, int arg1) {
        if (msg.replyTo == null) return;
        Message dstMsg = obtainMessageWithWhatAndArg2(msg, what);
        dstMsg.arg1 = arg1;
        mReplyChannel.replyToMessage(msg, dstMsg);
    }

    private void replyToMessage(Message msg, int what, Object obj) {
        if (msg.replyTo == null) return;
        Message dstMsg = obtainMessageWithWhatAndArg2(msg, 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
     * <p>see WifiManager for details
     */
    private Message obtainMessageWithWhatAndArg2(Message srcMsg, int what) {
        Message msg = Message.obtain();
        msg.what = what;
        msg.arg2 = srcMsg.arg2;
        return msg;
    }

    /**
     * Notify interested parties if a wifi config has been changed.
     *
     * @param wifiCredentialEventType WIFI_CREDENTIAL_SAVED or WIFI_CREDENTIAL_FORGOT
     * @param config Must have a WifiConfiguration object to succeed
     * TODO: b/35258354 investigate if this can be removed.  Is the broadcast sent by
     * WifiConfigManager sufficient?
     */
    private void broadcastWifiCredentialChanged(int wifiCredentialEventType,
            WifiConfiguration config) {
        if (config != null && config.preSharedKey != null) {
            Intent intent = new Intent(WifiManager.WIFI_CREDENTIAL_CHANGED_ACTION);
            intent.putExtra(WifiManager.EXTRA_WIFI_CREDENTIAL_SSID, config.SSID);
            intent.putExtra(WifiManager.EXTRA_WIFI_CREDENTIAL_EVENT_TYPE,
                    wifiCredentialEventType);
            mContext.sendBroadcastAsUser(intent, UserHandle.CURRENT,
                    android.Manifest.permission.RECEIVE_WIFI_CREDENTIAL_CHANGE);
        }
    }

    void handleGsmAuthRequest(SimAuthRequestData requestData) {
        if (targetWificonfiguration == null
                || targetWificonfiguration.networkId
                == lookupFrameworkNetworkId(requestData.networkId)) {
            logd("id matches targetWifiConfiguration");
        } else {
            logd("id does not match targetWifiConfiguration");
            return;
        }

        String response =
                TelephonyUtil.getGsmSimAuthResponse(requestData.data, getTelephonyManager());
        if (response == null) {
            mWifiNative.simAuthFailedResponse(requestData.networkId);
        } else {
            logv("Supplicant Response -" + response);
            mWifiNative.simAuthResponse(requestData.networkId, "GSM-AUTH", response);
        }
    }

    void handle3GAuthRequest(SimAuthRequestData requestData) {
        if (targetWificonfiguration == null
                || targetWificonfiguration.networkId
                == lookupFrameworkNetworkId(requestData.networkId)) {
            logd("id matches targetWifiConfiguration");
        } else {
            logd("id does not match targetWifiConfiguration");
            return;
        }

        SimAuthResponseData response =
                TelephonyUtil.get3GAuthResponse(requestData, getTelephonyManager());
        if (response != null) {
            mWifiNative.simAuthResponse(requestData.networkId, response.type, response.response);
        } else {
            mWifiNative.umtsAuthFailedResponse(requestData.networkId);
        }
    }

    /**
     * Automatically connect to the network specified
     *
     * @param networkId ID of the network to connect to
     * @param bssid BSSID of the network
     */
    public void startConnectToNetwork(int networkId, String bssid) {
        synchronized (mWifiReqCountLock) {
            if (hasConnectionRequests()) {
                sendMessage(CMD_START_CONNECT, networkId, 0, bssid);
            }
        }
    }

    /**
     * Automatically roam to the network specified
     *
     * @param networkId ID of the network to roam to
     * @param scanResult scan result which identifies the network to roam to
     */
    public void startRoamToNetwork(int networkId, ScanResult scanResult) {
        sendMessage(CMD_START_ROAM, networkId, 0, scanResult);
    }

    /**
     * Dynamically turn on/off WifiConnectivityManager
     *
     * @param enabled true-enable; false-disable
     */
    public void enableWifiConnectivityManager(boolean enabled) {
        sendMessage(CMD_ENABLE_WIFI_CONNECTIVITY_MANAGER, enabled ? 1 : 0);
    }

    /**
     * @param reason reason code from supplicant on network disconnected event
     * @return true if this is a suspicious disconnect
     */
    static boolean unexpectedDisconnectedReason(int reason) {
        return reason == 2              // PREV_AUTH_NOT_VALID
                || reason == 6          // CLASS2_FRAME_FROM_NONAUTH_STA
                || reason == 7          // FRAME_FROM_NONASSOC_STA
                || reason == 8          // STA_HAS_LEFT
                || reason == 9          // STA_REQ_ASSOC_WITHOUT_AUTH
                || reason == 14         // MICHAEL_MIC_FAILURE
                || reason == 15         // 4WAY_HANDSHAKE_TIMEOUT
                || reason == 16         // GROUP_KEY_UPDATE_TIMEOUT
                || reason == 18         // GROUP_CIPHER_NOT_VALID
                || reason == 19         // PAIRWISE_CIPHER_NOT_VALID
                || reason == 23         // IEEE_802_1X_AUTH_FAILED
                || reason == 34;        // DISASSOC_LOW_ACK
    }

    /**
     * Update WifiMetrics before dumping
     */
    public void updateWifiMetrics() {
        mWifiMetrics.updateSavedNetworks(mWifiConfigManager.getSavedNetworks());
    }

    /**
     * Private method to handle calling WifiConfigManager to forget/remove network configs and reply
     * to the message from the sender of the outcome.
     *
     * The current implementation requires that forget and remove be handled in different ways
     * (responses are handled differently).  In the interests of organization, the handling is all
     * now in this helper method.  TODO: b/35257965 is filed to track the possibility of merging
     * the two call paths.
     */
    private boolean deleteNetworkConfigAndSendReply(Message message, boolean calledFromForget) {
        boolean success = mWifiConfigManager.removeNetwork(message.arg1, message.sendingUid);
        if (!success) {
            loge("Failed to remove network");
        }

        if (calledFromForget) {
            if (success) {
                replyToMessage(message, WifiManager.FORGET_NETWORK_SUCCEEDED);
                broadcastWifiCredentialChanged(WifiManager.WIFI_CREDENTIAL_FORGOT,
                                               (WifiConfiguration) message.obj);
                return true;
            }
            replyToMessage(message, WifiManager.FORGET_NETWORK_FAILED, WifiManager.ERROR);
            return false;
        } else {
            // Remaining calls are from the removeNetwork path
            if (success) {
                replyToMessage(message, message.what, SUCCESS);
                return true;
            }
            messageHandlingStatus = MESSAGE_HANDLING_STATUS_FAIL;
            replyToMessage(message, message.what, FAILURE);
            return false;
        }
    }

    private static String getLinkPropertiesSummary(LinkProperties lp) {
        List<String> attributes = new ArrayList<>(6);
        if (lp.hasIPv4Address()) {
            attributes.add("v4");
        }
        if (lp.hasIPv4DefaultRoute()) {
            attributes.add("v4r");
        }
        if (lp.hasIPv4DnsServer()) {
            attributes.add("v4dns");
        }
        if (lp.hasGlobalIPv6Address()) {
            attributes.add("v6");
        }
        if (lp.hasIPv6DefaultRoute()) {
            attributes.add("v6r");
        }
        if (lp.hasIPv6DnsServer()) {
            attributes.add("v6dns");
        }

        return TextUtils.join(" ", attributes);
    }

    /**
     * Gets the SSID from the WifiConfiguration pointed at by 'mTargetNetworkId'
     * This should match the network config framework is attempting to connect to.
     */
    private String getTargetSsid() {
        WifiConfiguration currentConfig = mWifiConfigManager.getConfiguredNetwork(mTargetNetworkId);
        if (currentConfig != null) {
            return currentConfig.SSID;
        }
        return null;
    }

    private void p2pSendMessage(int what) {
        if (mWifiP2pChannel != null) {
            mWifiP2pChannel.sendMessage(what);
        }
    }

    private void p2pSendMessage(int what, int arg1) {
        if (mWifiP2pChannel != null) {
            mWifiP2pChannel.sendMessage(what, arg1);
        }
    }

    /**
     * Check if there is any connection request for WiFi network.
     * Note, caller of this helper function must acquire mWifiReqCountLock.
     */
    private boolean hasConnectionRequests() {
        return mConnectionReqCount > 0 || mUntrustedReqCount > 0;
    }

    /**
     * Returns whether CMD_IP_REACHABILITY_LOST events should trigger disconnects.
     */
    public boolean getIpReachabilityDisconnectEnabled() {
        return mIpReachabilityDisconnectEnabled;
    }

    /**
     * Sets whether CMD_IP_REACHABILITY_LOST events should trigger disconnects.
     */
    public void setIpReachabilityDisconnectEnabled(boolean enabled) {
        mIpReachabilityDisconnectEnabled = enabled;
    }

    /**
     * Sends a message to initialize the WifiStateMachine.
     *
     * @return true if succeeded, false otherwise.
     */
    public boolean syncInitialize(AsyncChannel channel) {
        Message resultMsg = channel.sendMessageSynchronously(CMD_INITIALIZE);
        boolean result = (resultMsg.arg1 != FAILURE);
        resultMsg.recycle();
        return result;
    }
}