| /* |
| * Copyright (C) 2016 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.WifiConfiguration.NetworkSelectionStatus.DISABLED_NO_INTERNET_PERMANENT; |
| import static android.net.wifi.WifiConfiguration.NetworkSelectionStatus.DISABLED_NO_INTERNET_TEMPORARY; |
| |
| import static com.android.internal.util.Preconditions.checkNotNull; |
| import static com.android.server.wifi.ClientModeImpl.WIFI_WORK_SOURCE; |
| |
| import android.app.AlarmManager; |
| import android.content.Context; |
| import android.net.wifi.ScanResult; |
| import android.net.wifi.SupplicantState; |
| import android.net.wifi.WifiConfiguration; |
| import android.net.wifi.WifiInfo; |
| import android.net.wifi.WifiManager; |
| import android.net.wifi.WifiManager.DeviceMobilityState; |
| import android.net.wifi.WifiScanner; |
| import android.net.wifi.WifiScanner.PnoSettings; |
| import android.net.wifi.WifiScanner.ScanSettings; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.os.Process; |
| import android.os.WorkSource; |
| import android.util.LocalLog; |
| import android.util.Log; |
| |
| import com.android.internal.R; |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.server.wifi.util.ScanResultUtil; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * This class manages all the connectivity related scanning activities. |
| * |
| * When the screen is turned on or off, WiFi is connected or disconnected, |
| * or on-demand, a scan is initiatiated and the scan results are passed |
| * to WifiNetworkSelector for it to make a recommendation on which network |
| * to connect to. |
| */ |
| public class WifiConnectivityManager { |
| public static final String WATCHDOG_TIMER_TAG = |
| "WifiConnectivityManager Schedule Watchdog Timer"; |
| public static final String PERIODIC_SCAN_TIMER_TAG = |
| "WifiConnectivityManager Schedule Periodic Scan Timer"; |
| public static final String RESTART_SINGLE_SCAN_TIMER_TAG = |
| "WifiConnectivityManager Restart Single Scan"; |
| public static final String RESTART_CONNECTIVITY_SCAN_TIMER_TAG = |
| "WifiConnectivityManager Restart Scan"; |
| |
| private static final long RESET_TIME_STAMP = Long.MIN_VALUE; |
| // Constants to indicate whether a scan should start immediately or |
| // it should comply to the minimum scan interval rule. |
| private static final boolean SCAN_IMMEDIATELY = true; |
| private static final boolean SCAN_ON_SCHEDULE = false; |
| // Periodic scan interval in milli-seconds. This is the scan |
| // performed when screen is on. |
| @VisibleForTesting |
| public static final int PERIODIC_SCAN_INTERVAL_MS = 20 * 1000; // 20 seconds |
| // When screen is on and WiFi traffic is heavy, exponential backoff |
| // connectivity scans are scheduled. This constant defines the maximum |
| // scan interval in this scenario. |
| @VisibleForTesting |
| public static final int MAX_PERIODIC_SCAN_INTERVAL_MS = 160 * 1000; // 160 seconds |
| // Initial PNO scan interval in milliseconds when the device is moving. The scan interval backs |
| // off from this initial interval on subsequent scans. This scan is performed when screen is |
| // off and disconnected. |
| @VisibleForTesting |
| static final int MOVING_PNO_SCAN_INTERVAL_MS = 20 * 1000; // 20 seconds |
| // Initial PNO scan interval in milliseconds when the device is stationary. The scan interval |
| // backs off from this initial interval on subsequent scans. This scan is performed when screen |
| // is off and disconnected. |
| @VisibleForTesting |
| static final int STATIONARY_PNO_SCAN_INTERVAL_MS = 60 * 1000; // 1 minute |
| |
| // PNO scan interval in milli-seconds. This is the scan |
| // performed when screen is off and connected. |
| private static final int CONNECTED_PNO_SCAN_INTERVAL_MS = 160 * 1000; // 160 seconds |
| // When a network is found by PNO scan but gets rejected by Wifi Network Selector due |
| // to its low RSSI value, scan will be reschduled in an exponential back off manner. |
| private static final int LOW_RSSI_NETWORK_RETRY_START_DELAY_MS = 20 * 1000; // 20 seconds |
| private static final int LOW_RSSI_NETWORK_RETRY_MAX_DELAY_MS = 80 * 1000; // 80 seconds |
| // Maximum number of retries when starting a scan failed |
| @VisibleForTesting |
| public static final int MAX_SCAN_RESTART_ALLOWED = 5; |
| // Number of milli-seconds to delay before retry starting |
| // a previously failed scan |
| private static final int RESTART_SCAN_DELAY_MS = 2 * 1000; // 2 seconds |
| // When in disconnected mode, a watchdog timer will be fired |
| // every WATCHDOG_INTERVAL_MS to start a single scan. This is |
| // to prevent caveat from things like PNO scan. |
| private static final int WATCHDOG_INTERVAL_MS = 20 * 60 * 1000; // 20 minutes |
| // Restricted channel list age out value. |
| private static final int CHANNEL_LIST_AGE_MS = 60 * 60 * 1000; // 1 hour |
| // This is the time interval for the connection attempt rate calculation. Connection attempt |
| // timestamps beyond this interval is evicted from the list. |
| public static final int MAX_CONNECTION_ATTEMPTS_TIME_INTERVAL_MS = 4 * 60 * 1000; // 4 mins |
| // Max number of connection attempts in the above time interval. |
| public static final int MAX_CONNECTION_ATTEMPTS_RATE = 6; |
| |
| // ClientModeImpl has a bunch of states. From the |
| // WifiConnectivityManager's perspective it only cares |
| // if it is in Connected state, Disconnected state or in |
| // transition between these two states. |
| public static final int WIFI_STATE_UNKNOWN = 0; |
| public static final int WIFI_STATE_CONNECTED = 1; |
| public static final int WIFI_STATE_DISCONNECTED = 2; |
| public static final int WIFI_STATE_TRANSITIONING = 3; |
| |
| // Log tag for this class |
| private static final String TAG = "WifiConnectivityManager"; |
| |
| private final ClientModeImpl mStateMachine; |
| private final WifiInjector mWifiInjector; |
| private final WifiConfigManager mConfigManager; |
| private final WifiInfo mWifiInfo; |
| private final WifiConnectivityHelper mConnectivityHelper; |
| private final WifiNetworkSelector mNetworkSelector; |
| private final WifiLastResortWatchdog mWifiLastResortWatchdog; |
| private final OpenNetworkNotifier mOpenNetworkNotifier; |
| private final CarrierNetworkNotifier mCarrierNetworkNotifier; |
| private final CarrierNetworkConfig mCarrierNetworkConfig; |
| private final WifiMetrics mWifiMetrics; |
| private final AlarmManager mAlarmManager; |
| private final Handler mEventHandler; |
| private final Clock mClock; |
| private final ScoringParams mScoringParams; |
| private final LocalLog mLocalLog; |
| private final LinkedList<Long> mConnectionAttemptTimeStamps; |
| private WifiScanner mScanner; |
| |
| private boolean mDbg = false; |
| private boolean mWifiEnabled = false; |
| private boolean mWifiConnectivityManagerEnabled = false; |
| private boolean mRunning = false; |
| private boolean mScreenOn = false; |
| private int mWifiState = WIFI_STATE_UNKNOWN; |
| private boolean mUntrustedConnectionAllowed = false; |
| private boolean mTrustedConnectionAllowed = false; |
| private boolean mSpecificNetworkRequestInProgress = false; |
| private int mScanRestartCount = 0; |
| private int mSingleScanRestartCount = 0; |
| private int mTotalConnectivityAttemptsRateLimited = 0; |
| private String mLastConnectionAttemptBssid = null; |
| private int mPeriodicSingleScanInterval = PERIODIC_SCAN_INTERVAL_MS; |
| private long mLastPeriodicSingleScanTimeStamp = RESET_TIME_STAMP; |
| private boolean mPnoScanStarted = false; |
| private boolean mPeriodicScanTimerSet = false; |
| // Device configs |
| private boolean mEnableAutoJoinWhenAssociated; |
| private boolean mWaitForFullBandScanResults = false; |
| private boolean mUseSingleRadioChainScanResults = false; |
| private int mFullScanMaxTxRate; |
| private int mFullScanMaxRxRate; |
| |
| // PNO settings |
| private int mCurrentConnectionBonus; |
| private int mSameNetworkBonus; |
| private int mSecureBonus; |
| private int mBand5GHzBonus; |
| private int mRssiScoreOffset; |
| private int mRssiScoreSlope; |
| private int mPnoScanIntervalMs; |
| |
| // BSSID blacklist |
| @VisibleForTesting |
| public static final int BSSID_BLACKLIST_THRESHOLD = 3; |
| @VisibleForTesting |
| public static final int BSSID_BLACKLIST_EXPIRE_TIME_MS = 5 * 60 * 1000; |
| private static class BssidBlacklistStatus { |
| // Number of times this BSSID has been rejected for association. |
| public int counter; |
| public boolean isBlacklisted; |
| public long blacklistedTimeStamp = RESET_TIME_STAMP; |
| } |
| private Map<String, BssidBlacklistStatus> mBssidBlacklist = |
| new HashMap<>(); |
| |
| // Association failure reason codes |
| @VisibleForTesting |
| public static final int REASON_CODE_AP_UNABLE_TO_HANDLE_NEW_STA = 17; |
| |
| // A helper to log debugging information in the local log buffer, which can |
| // be retrieved in bugreport. |
| private void localLog(String log) { |
| mLocalLog.log(log); |
| } |
| |
| // A periodic/PNO scan will be rescheduled up to MAX_SCAN_RESTART_ALLOWED times |
| // if the start scan command failed. An timer is used here to make it a deferred retry. |
| private final AlarmManager.OnAlarmListener mRestartScanListener = |
| new AlarmManager.OnAlarmListener() { |
| public void onAlarm() { |
| startConnectivityScan(SCAN_IMMEDIATELY); |
| } |
| }; |
| |
| // A single scan will be rescheduled up to MAX_SCAN_RESTART_ALLOWED times |
| // if the start scan command failed. An timer is used here to make it a deferred retry. |
| private class RestartSingleScanListener implements AlarmManager.OnAlarmListener { |
| private final boolean mIsFullBandScan; |
| |
| RestartSingleScanListener(boolean isFullBandScan) { |
| mIsFullBandScan = isFullBandScan; |
| } |
| |
| @Override |
| public void onAlarm() { |
| startSingleScan(mIsFullBandScan, WIFI_WORK_SOURCE); |
| } |
| } |
| |
| // As a watchdog mechanism, a single scan will be scheduled every WATCHDOG_INTERVAL_MS |
| // if it is in the WIFI_STATE_DISCONNECTED state. |
| private final AlarmManager.OnAlarmListener mWatchdogListener = |
| new AlarmManager.OnAlarmListener() { |
| public void onAlarm() { |
| watchdogHandler(); |
| } |
| }; |
| |
| // Due to b/28020168, timer based single scan will be scheduled |
| // to provide periodic scan in an exponential backoff fashion. |
| private final AlarmManager.OnAlarmListener mPeriodicScanTimerListener = |
| new AlarmManager.OnAlarmListener() { |
| public void onAlarm() { |
| periodicScanTimerHandler(); |
| } |
| }; |
| |
| /** |
| * Handles 'onResult' callbacks for the Periodic, Single & Pno ScanListener. |
| * Executes selection of potential network candidates, initiation of connection attempt to that |
| * network. |
| * |
| * @return true - if a candidate is selected by WifiNetworkSelector |
| * false - if no candidate is selected by WifiNetworkSelector |
| */ |
| private boolean handleScanResults(List<ScanDetail> scanDetails, String listenerName) { |
| // Check if any blacklisted BSSIDs can be freed. |
| refreshBssidBlacklist(); |
| |
| if (mStateMachine.isSupplicantTransientState()) { |
| localLog(listenerName |
| + " onResults: No network selection because supplicantTransientState is " |
| + mStateMachine.isSupplicantTransientState()); |
| return false; |
| } |
| |
| localLog(listenerName + " onResults: start network selection"); |
| |
| WifiConfiguration candidate = |
| mNetworkSelector.selectNetwork(scanDetails, buildBssidBlacklist(), mWifiInfo, |
| mStateMachine.isConnected(), mStateMachine.isDisconnected(), |
| mUntrustedConnectionAllowed); |
| mWifiLastResortWatchdog.updateAvailableNetworks( |
| mNetworkSelector.getConnectableScanDetails()); |
| mWifiMetrics.countScanResults(scanDetails); |
| if (candidate != null) { |
| localLog(listenerName + ": WNS candidate-" + candidate.SSID); |
| connectToNetwork(candidate); |
| return true; |
| } else { |
| if (mWifiState == WIFI_STATE_DISCONNECTED) { |
| mOpenNetworkNotifier.handleScanResults( |
| mNetworkSelector.getFilteredScanDetailsForOpenUnsavedNetworks()); |
| if (mCarrierNetworkConfig.isCarrierEncryptionInfoAvailable()) { |
| mCarrierNetworkNotifier.handleScanResults( |
| mNetworkSelector.getFilteredScanDetailsForCarrierUnsavedNetworks( |
| mCarrierNetworkConfig)); |
| } |
| } |
| return false; |
| } |
| } |
| |
| // All single scan results listener. |
| // |
| // Note: This is the listener for all the available single scan results, |
| // including the ones initiated by WifiConnectivityManager and |
| // other modules. |
| private class AllSingleScanListener implements WifiScanner.ScanListener { |
| private List<ScanDetail> mScanDetails = new ArrayList<ScanDetail>(); |
| private int mNumScanResultsIgnoredDueToSingleRadioChain = 0; |
| |
| public void clearScanDetails() { |
| mScanDetails.clear(); |
| mNumScanResultsIgnoredDueToSingleRadioChain = 0; |
| } |
| |
| @Override |
| public void onSuccess() { |
| } |
| |
| @Override |
| public void onFailure(int reason, String description) { |
| localLog("registerScanListener onFailure:" |
| + " reason: " + reason + " description: " + description); |
| } |
| |
| @Override |
| public void onPeriodChanged(int periodInMs) { |
| } |
| |
| @Override |
| public void onResults(WifiScanner.ScanData[] results) { |
| if (!mWifiEnabled || !mWifiConnectivityManagerEnabled) { |
| clearScanDetails(); |
| mWaitForFullBandScanResults = false; |
| return; |
| } |
| |
| // We treat any full band scans (with DFS or not) as "full". |
| boolean isFullBandScanResults = |
| results[0].getBandScanned() == WifiScanner.WIFI_BAND_BOTH_WITH_DFS |
| || results[0].getBandScanned() == WifiScanner.WIFI_BAND_BOTH; |
| // Full band scan results only. |
| if (mWaitForFullBandScanResults) { |
| if (!isFullBandScanResults) { |
| localLog("AllSingleScanListener waiting for full band scan results."); |
| clearScanDetails(); |
| return; |
| } else { |
| mWaitForFullBandScanResults = false; |
| } |
| } |
| if (results.length > 0) { |
| mWifiMetrics.incrementAvailableNetworksHistograms(mScanDetails, |
| isFullBandScanResults); |
| } |
| if (mNumScanResultsIgnoredDueToSingleRadioChain > 0) { |
| Log.i(TAG, "Number of scan results ignored due to single radio chain scan: " |
| + mNumScanResultsIgnoredDueToSingleRadioChain); |
| } |
| boolean wasConnectAttempted = handleScanResults(mScanDetails, "AllSingleScanListener"); |
| clearScanDetails(); |
| |
| // Update metrics to see if a single scan detected a valid network |
| // while PNO scan didn't. |
| // Note: We don't update the background scan metrics any more as it is |
| // not in use. |
| if (mPnoScanStarted) { |
| if (wasConnectAttempted) { |
| mWifiMetrics.incrementNumConnectivityWatchdogPnoBad(); |
| } else { |
| mWifiMetrics.incrementNumConnectivityWatchdogPnoGood(); |
| } |
| } |
| } |
| |
| @Override |
| public void onFullResult(ScanResult fullScanResult) { |
| if (!mWifiEnabled || !mWifiConnectivityManagerEnabled) { |
| return; |
| } |
| |
| if (mDbg) { |
| localLog("AllSingleScanListener onFullResult: " + fullScanResult.SSID |
| + " capabilities " + fullScanResult.capabilities); |
| } |
| |
| // When the scan result has radio chain info, ensure we throw away scan results |
| // not received with both radio chains (if |mUseSingleRadioChainScanResults| is false). |
| if (!mUseSingleRadioChainScanResults |
| && fullScanResult.radioChainInfos != null |
| && fullScanResult.radioChainInfos.length == 1) { |
| // Keep track of the number of dropped scan results for logging. |
| mNumScanResultsIgnoredDueToSingleRadioChain++; |
| return; |
| } |
| |
| mScanDetails.add(ScanResultUtil.toScanDetail(fullScanResult)); |
| } |
| } |
| |
| private final AllSingleScanListener mAllSingleScanListener = new AllSingleScanListener(); |
| |
| // Single scan results listener. A single scan is initiated when |
| // DisconnectedPNO scan found a valid network and woke up |
| // the system, or by the watchdog timer, or to form the timer based |
| // periodic scan. |
| // |
| // Note: This is the listener for the single scans initiated by the |
| // WifiConnectivityManager. |
| private class SingleScanListener implements WifiScanner.ScanListener { |
| private final boolean mIsFullBandScan; |
| |
| SingleScanListener(boolean isFullBandScan) { |
| mIsFullBandScan = isFullBandScan; |
| } |
| |
| @Override |
| public void onSuccess() { |
| } |
| |
| @Override |
| public void onFailure(int reason, String description) { |
| localLog("SingleScanListener onFailure:" |
| + " reason: " + reason + " description: " + description); |
| |
| // reschedule the scan |
| if (mSingleScanRestartCount++ < MAX_SCAN_RESTART_ALLOWED) { |
| scheduleDelayedSingleScan(mIsFullBandScan); |
| } else { |
| mSingleScanRestartCount = 0; |
| localLog("Failed to successfully start single scan for " |
| + MAX_SCAN_RESTART_ALLOWED + " times"); |
| } |
| } |
| |
| @Override |
| public void onPeriodChanged(int periodInMs) { |
| localLog("SingleScanListener onPeriodChanged: " |
| + "actual scan period " + periodInMs + "ms"); |
| } |
| |
| @Override |
| public void onResults(WifiScanner.ScanData[] results) { |
| mSingleScanRestartCount = 0; |
| } |
| |
| @Override |
| public void onFullResult(ScanResult fullScanResult) { |
| } |
| } |
| |
| // PNO scan results listener for both disconnected and connected PNO scanning. |
| // A PNO scan is initiated when screen is off. |
| private class PnoScanListener implements WifiScanner.PnoScanListener { |
| private List<ScanDetail> mScanDetails = new ArrayList<ScanDetail>(); |
| private int mLowRssiNetworkRetryDelay = |
| LOW_RSSI_NETWORK_RETRY_START_DELAY_MS; |
| |
| public void clearScanDetails() { |
| mScanDetails.clear(); |
| } |
| |
| // Reset to the start value when either a non-PNO scan is started or |
| // WifiNetworkSelector selects a candidate from the PNO scan results. |
| public void resetLowRssiNetworkRetryDelay() { |
| mLowRssiNetworkRetryDelay = LOW_RSSI_NETWORK_RETRY_START_DELAY_MS; |
| } |
| |
| @VisibleForTesting |
| public int getLowRssiNetworkRetryDelay() { |
| return mLowRssiNetworkRetryDelay; |
| } |
| |
| @Override |
| public void onSuccess() { |
| } |
| |
| @Override |
| public void onFailure(int reason, String description) { |
| localLog("PnoScanListener onFailure:" |
| + " reason: " + reason + " description: " + description); |
| |
| // reschedule the scan |
| if (mScanRestartCount++ < MAX_SCAN_RESTART_ALLOWED) { |
| scheduleDelayedConnectivityScan(RESTART_SCAN_DELAY_MS); |
| } else { |
| mScanRestartCount = 0; |
| localLog("Failed to successfully start PNO scan for " |
| + MAX_SCAN_RESTART_ALLOWED + " times"); |
| } |
| } |
| |
| @Override |
| public void onPeriodChanged(int periodInMs) { |
| localLog("PnoScanListener onPeriodChanged: " |
| + "actual scan period " + periodInMs + "ms"); |
| } |
| |
| // Currently the PNO scan results doesn't include IE, |
| // which contains information required by WifiNetworkSelector. Ignore them |
| // for now. |
| @Override |
| public void onResults(WifiScanner.ScanData[] results) { |
| } |
| |
| @Override |
| public void onFullResult(ScanResult fullScanResult) { |
| } |
| |
| @Override |
| public void onPnoNetworkFound(ScanResult[] results) { |
| for (ScanResult result: results) { |
| if (result.informationElements == null) { |
| localLog("Skipping scan result with null information elements"); |
| continue; |
| } |
| mScanDetails.add(ScanResultUtil.toScanDetail(result)); |
| } |
| |
| boolean wasConnectAttempted; |
| wasConnectAttempted = handleScanResults(mScanDetails, "PnoScanListener"); |
| clearScanDetails(); |
| mScanRestartCount = 0; |
| |
| if (!wasConnectAttempted) { |
| // The scan results were rejected by WifiNetworkSelector due to low RSSI values |
| if (mLowRssiNetworkRetryDelay > LOW_RSSI_NETWORK_RETRY_MAX_DELAY_MS) { |
| mLowRssiNetworkRetryDelay = LOW_RSSI_NETWORK_RETRY_MAX_DELAY_MS; |
| } |
| scheduleDelayedConnectivityScan(mLowRssiNetworkRetryDelay); |
| |
| // Set up the delay value for next retry. |
| mLowRssiNetworkRetryDelay *= 2; |
| } else { |
| resetLowRssiNetworkRetryDelay(); |
| } |
| } |
| } |
| |
| private final PnoScanListener mPnoScanListener = new PnoScanListener(); |
| |
| private class OnSavedNetworkUpdateListener implements |
| WifiConfigManager.OnSavedNetworkUpdateListener { |
| @Override |
| public void onSavedNetworkAdded(int networkId) { |
| updatePnoScan(); |
| } |
| @Override |
| public void onSavedNetworkEnabled(int networkId) { |
| updatePnoScan(); |
| } |
| @Override |
| public void onSavedNetworkRemoved(int networkId) { |
| updatePnoScan(); |
| } |
| @Override |
| public void onSavedNetworkUpdated(int networkId) { |
| // User might have changed meteredOverride, so update capabilties |
| mStateMachine.updateCapabilities(); |
| updatePnoScan(); |
| } |
| @Override |
| public void onSavedNetworkTemporarilyDisabled(int networkId, int disableReason) { |
| if (disableReason == DISABLED_NO_INTERNET_TEMPORARY) return; |
| mConnectivityHelper.removeNetworkIfCurrent(networkId); |
| } |
| @Override |
| public void onSavedNetworkPermanentlyDisabled(int networkId, int disableReason) { |
| // For DISABLED_NO_INTERNET_PERMANENT we do not need to remove the network |
| // because supplicant won't be trying to reconnect. If this is due to a |
| // preventAutomaticReconnect request from ConnectivityService, that service |
| // will disconnect as appropriate. |
| if (disableReason == DISABLED_NO_INTERNET_PERMANENT) return; |
| mConnectivityHelper.removeNetworkIfCurrent(networkId); |
| updatePnoScan(); |
| } |
| private void updatePnoScan() { |
| // Update the PNO scan network list when screen is off. Here we |
| // rely on startConnectivityScan() to perform all the checks and clean up. |
| if (!mScreenOn) { |
| localLog("Saved networks updated"); |
| startConnectivityScan(false); |
| } |
| } |
| } |
| |
| /** |
| * WifiConnectivityManager constructor |
| */ |
| WifiConnectivityManager(Context context, ScoringParams scoringParams, |
| ClientModeImpl stateMachine, |
| WifiInjector injector, WifiConfigManager configManager, WifiInfo wifiInfo, |
| WifiNetworkSelector networkSelector, WifiConnectivityHelper connectivityHelper, |
| WifiLastResortWatchdog wifiLastResortWatchdog, OpenNetworkNotifier openNetworkNotifier, |
| CarrierNetworkNotifier carrierNetworkNotifier, |
| CarrierNetworkConfig carrierNetworkConfig, WifiMetrics wifiMetrics, Looper looper, |
| Clock clock, LocalLog localLog) { |
| mStateMachine = stateMachine; |
| mWifiInjector = injector; |
| mConfigManager = configManager; |
| mWifiInfo = wifiInfo; |
| mNetworkSelector = networkSelector; |
| mConnectivityHelper = connectivityHelper; |
| mLocalLog = localLog; |
| mWifiLastResortWatchdog = wifiLastResortWatchdog; |
| mOpenNetworkNotifier = openNetworkNotifier; |
| mCarrierNetworkNotifier = carrierNetworkNotifier; |
| mCarrierNetworkConfig = carrierNetworkConfig; |
| mWifiMetrics = wifiMetrics; |
| mAlarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); |
| mEventHandler = new Handler(looper); |
| mClock = clock; |
| mScoringParams = scoringParams; |
| mConnectionAttemptTimeStamps = new LinkedList<>(); |
| |
| mBand5GHzBonus = context.getResources().getInteger( |
| R.integer.config_wifi_framework_5GHz_preference_boost_factor); |
| mCurrentConnectionBonus = context.getResources().getInteger( |
| R.integer.config_wifi_framework_current_network_boost); |
| mSameNetworkBonus = context.getResources().getInteger( |
| R.integer.config_wifi_framework_SAME_BSSID_AWARD); |
| mSecureBonus = context.getResources().getInteger( |
| R.integer.config_wifi_framework_SECURITY_AWARD); |
| mRssiScoreOffset = context.getResources().getInteger( |
| R.integer.config_wifi_framework_RSSI_SCORE_OFFSET); |
| mRssiScoreSlope = context.getResources().getInteger( |
| R.integer.config_wifi_framework_RSSI_SCORE_SLOPE); |
| mEnableAutoJoinWhenAssociated = context.getResources().getBoolean( |
| R.bool.config_wifi_framework_enable_associated_network_selection); |
| mUseSingleRadioChainScanResults = context.getResources().getBoolean( |
| R.bool.config_wifi_framework_use_single_radio_chain_scan_results_network_selection); |
| |
| |
| mFullScanMaxTxRate = context.getResources().getInteger( |
| R.integer.config_wifi_framework_max_tx_rate_for_full_scan); |
| mFullScanMaxRxRate = context.getResources().getInteger( |
| R.integer.config_wifi_framework_max_rx_rate_for_full_scan); |
| |
| mPnoScanIntervalMs = MOVING_PNO_SCAN_INTERVAL_MS; |
| |
| localLog("PNO settings:" |
| + " min5GHzRssi " + mScoringParams.getEntryRssi(ScoringParams.BAND5) |
| + " min24GHzRssi " + mScoringParams.getEntryRssi(ScoringParams.BAND2) |
| + " currentConnectionBonus " + mCurrentConnectionBonus |
| + " sameNetworkBonus " + mSameNetworkBonus |
| + " secureNetworkBonus " + mSecureBonus |
| + " initialScoreMax " + initialScoreMax()); |
| |
| // Listen to WifiConfigManager network update events |
| mConfigManager.setOnSavedNetworkUpdateListener(new OnSavedNetworkUpdateListener()); |
| } |
| |
| /** Returns maximum PNO score, before any awards/bonuses. */ |
| private int initialScoreMax() { |
| return mRssiScoreSlope * (Math.max(mScoringParams.getGoodRssi(ScoringParams.BAND2), |
| mScoringParams.getGoodRssi(ScoringParams.BAND5)) |
| + mRssiScoreOffset); |
| } |
| |
| /** |
| * This checks the connection attempt rate and recommends whether the connection attempt |
| * should be skipped or not. This attempts to rate limit the rate of connections to |
| * prevent us from flapping between networks and draining battery rapidly. |
| */ |
| private boolean shouldSkipConnectionAttempt(Long timeMillis) { |
| Iterator<Long> attemptIter = mConnectionAttemptTimeStamps.iterator(); |
| // First evict old entries from the queue. |
| while (attemptIter.hasNext()) { |
| Long connectionAttemptTimeMillis = attemptIter.next(); |
| if ((timeMillis - connectionAttemptTimeMillis) |
| > MAX_CONNECTION_ATTEMPTS_TIME_INTERVAL_MS) { |
| attemptIter.remove(); |
| } else { |
| // This list is sorted by timestamps, so we can skip any more checks |
| break; |
| } |
| } |
| // If we've reached the max connection attempt rate, skip this connection attempt |
| return (mConnectionAttemptTimeStamps.size() >= MAX_CONNECTION_ATTEMPTS_RATE); |
| } |
| |
| /** |
| * Add the current connection attempt timestamp to our queue of connection attempts. |
| */ |
| private void noteConnectionAttempt(Long timeMillis) { |
| mConnectionAttemptTimeStamps.addLast(timeMillis); |
| } |
| |
| /** |
| * This is used to clear the connection attempt rate limiter. This is done when the user |
| * explicitly tries to connect to a specified network. |
| */ |
| private void clearConnectionAttemptTimeStamps() { |
| mConnectionAttemptTimeStamps.clear(); |
| } |
| |
| /** |
| * Attempt to connect to a network candidate. |
| * |
| * Based on the currently connected network, this menthod determines whether we should |
| * connect or roam to the network candidate recommended by WifiNetworkSelector. |
| */ |
| private void connectToNetwork(WifiConfiguration candidate) { |
| ScanResult scanResultCandidate = candidate.getNetworkSelectionStatus().getCandidate(); |
| if (scanResultCandidate == null) { |
| localLog("connectToNetwork: bad candidate - " + candidate |
| + " scanResult: " + scanResultCandidate); |
| return; |
| } |
| |
| String targetBssid = scanResultCandidate.BSSID; |
| String targetAssociationId = candidate.SSID + " : " + targetBssid; |
| |
| // Check if we are already connected or in the process of connecting to the target |
| // BSSID. mWifiInfo.mBSSID tracks the currently connected BSSID. This is checked just |
| // in case the firmware automatically roamed to a BSSID different from what |
| // WifiNetworkSelector selected. |
| if (targetBssid != null |
| && (targetBssid.equals(mLastConnectionAttemptBssid) |
| || targetBssid.equals(mWifiInfo.getBSSID())) |
| && SupplicantState.isConnecting(mWifiInfo.getSupplicantState())) { |
| localLog("connectToNetwork: Either already connected " |
| + "or is connecting to " + targetAssociationId); |
| return; |
| } |
| |
| if (candidate.BSSID != null |
| && !candidate.BSSID.equals(ClientModeImpl.SUPPLICANT_BSSID_ANY) |
| && !candidate.BSSID.equals(targetBssid)) { |
| localLog("connecToNetwork: target BSSID " + targetBssid + " does not match the " |
| + "config specified BSSID " + candidate.BSSID + ". Drop it!"); |
| return; |
| } |
| |
| long elapsedTimeMillis = mClock.getElapsedSinceBootMillis(); |
| if (!mScreenOn && shouldSkipConnectionAttempt(elapsedTimeMillis)) { |
| localLog("connectToNetwork: Too many connection attempts. Skipping this attempt!"); |
| mTotalConnectivityAttemptsRateLimited++; |
| return; |
| } |
| noteConnectionAttempt(elapsedTimeMillis); |
| |
| mLastConnectionAttemptBssid = targetBssid; |
| |
| WifiConfiguration currentConnectedNetwork = mConfigManager |
| .getConfiguredNetwork(mWifiInfo.getNetworkId()); |
| String currentAssociationId = (currentConnectedNetwork == null) ? "Disconnected" : |
| (mWifiInfo.getSSID() + " : " + mWifiInfo.getBSSID()); |
| |
| if (currentConnectedNetwork != null |
| && (currentConnectedNetwork.networkId == candidate.networkId |
| //TODO(b/36788683): re-enable linked configuration check |
| /* || currentConnectedNetwork.isLinked(candidate) */)) { |
| // Framework initiates roaming only if firmware doesn't support |
| // {@link android.net.wifi.WifiManager#WIFI_FEATURE_CONTROL_ROAMING}. |
| if (mConnectivityHelper.isFirmwareRoamingSupported()) { |
| // Keep this logging here for now to validate the firmware roaming behavior. |
| localLog("connectToNetwork: Roaming candidate - " + targetAssociationId + "." |
| + " The actual roaming target is up to the firmware."); |
| } else { |
| localLog("connectToNetwork: Roaming to " + targetAssociationId + " from " |
| + currentAssociationId); |
| mStateMachine.startRoamToNetwork(candidate.networkId, scanResultCandidate); |
| } |
| } else { |
| // Framework specifies the connection target BSSID if firmware doesn't support |
| // {@link android.net.wifi.WifiManager#WIFI_FEATURE_CONTROL_ROAMING} or the |
| // candidate configuration contains a specified BSSID. |
| if (mConnectivityHelper.isFirmwareRoamingSupported() && (candidate.BSSID == null |
| || candidate.BSSID.equals(ClientModeImpl.SUPPLICANT_BSSID_ANY))) { |
| targetBssid = ClientModeImpl.SUPPLICANT_BSSID_ANY; |
| localLog("connectToNetwork: Connect to " + candidate.SSID + ":" + targetBssid |
| + " from " + currentAssociationId); |
| } else { |
| localLog("connectToNetwork: Connect to " + targetAssociationId + " from " |
| + currentAssociationId); |
| } |
| mStateMachine.startConnectToNetwork(candidate.networkId, Process.WIFI_UID, targetBssid); |
| } |
| } |
| |
| // Helper for selecting the band for connectivity scan |
| private int getScanBand() { |
| return getScanBand(true); |
| } |
| |
| private int getScanBand(boolean isFullBandScan) { |
| if (isFullBandScan) { |
| return WifiScanner.WIFI_BAND_BOTH_WITH_DFS; |
| } else { |
| // Use channel list instead. |
| return WifiScanner.WIFI_BAND_UNSPECIFIED; |
| } |
| } |
| |
| // Helper for setting the channels for connectivity scan when band is unspecified. Returns |
| // false if we can't retrieve the info. |
| private boolean setScanChannels(ScanSettings settings) { |
| WifiConfiguration config = mStateMachine.getCurrentWifiConfiguration(); |
| |
| if (config == null) { |
| return false; |
| } |
| |
| Set<Integer> freqs = |
| mConfigManager.fetchChannelSetForNetworkForPartialScan( |
| config.networkId, CHANNEL_LIST_AGE_MS, mWifiInfo.getFrequency()); |
| |
| if (freqs != null && freqs.size() != 0) { |
| int index = 0; |
| settings.channels = new WifiScanner.ChannelSpec[freqs.size()]; |
| for (Integer freq : freqs) { |
| settings.channels[index++] = new WifiScanner.ChannelSpec(freq); |
| } |
| return true; |
| } else { |
| localLog("No scan channels for " + config.configKey() + ". Perform full band scan"); |
| return false; |
| } |
| } |
| |
| // Watchdog timer handler |
| private void watchdogHandler() { |
| // Schedule the next timer and start a single scan if we are in disconnected state. |
| // Otherwise, the watchdog timer will be scheduled when entering disconnected |
| // state. |
| if (mWifiState == WIFI_STATE_DISCONNECTED) { |
| localLog("start a single scan from watchdogHandler"); |
| |
| scheduleWatchdogTimer(); |
| startSingleScan(true, WIFI_WORK_SOURCE); |
| } |
| } |
| |
| // Start a single scan and set up the interval for next single scan. |
| private void startPeriodicSingleScan() { |
| long currentTimeStamp = mClock.getElapsedSinceBootMillis(); |
| |
| if (mLastPeriodicSingleScanTimeStamp != RESET_TIME_STAMP) { |
| long msSinceLastScan = currentTimeStamp - mLastPeriodicSingleScanTimeStamp; |
| if (msSinceLastScan < PERIODIC_SCAN_INTERVAL_MS) { |
| localLog("Last periodic single scan started " + msSinceLastScan |
| + "ms ago, defer this new scan request."); |
| schedulePeriodicScanTimer(PERIODIC_SCAN_INTERVAL_MS - (int) msSinceLastScan); |
| return; |
| } |
| } |
| |
| boolean isScanNeeded = true; |
| boolean isFullBandScan = true; |
| boolean isTrafficOverThreshold = mWifiInfo.txSuccessRate > mFullScanMaxTxRate |
| || mWifiInfo.rxSuccessRate > mFullScanMaxRxRate; |
| |
| // If the WiFi traffic is heavy, only partial scan is proposed. |
| if (mWifiState == WIFI_STATE_CONNECTED && isTrafficOverThreshold) { |
| // If only partial scan is proposed and firmware roaming control is supported, |
| // we will not issue any scan because firmware roaming will take care of |
| // intra-SSID roam. |
| if (mConnectivityHelper.isFirmwareRoamingSupported()) { |
| localLog("No partial scan because firmware roaming is supported."); |
| isScanNeeded = false; |
| } else { |
| localLog("No full band scan due to ongoing traffic"); |
| isFullBandScan = false; |
| } |
| } |
| |
| if (isScanNeeded) { |
| mLastPeriodicSingleScanTimeStamp = currentTimeStamp; |
| startSingleScan(isFullBandScan, WIFI_WORK_SOURCE); |
| schedulePeriodicScanTimer(mPeriodicSingleScanInterval); |
| |
| // Set up the next scan interval in an exponential backoff fashion. |
| mPeriodicSingleScanInterval *= 2; |
| if (mPeriodicSingleScanInterval > MAX_PERIODIC_SCAN_INTERVAL_MS) { |
| mPeriodicSingleScanInterval = MAX_PERIODIC_SCAN_INTERVAL_MS; |
| } |
| } else { |
| // Since we already skipped this scan, keep the same scan interval for next scan. |
| schedulePeriodicScanTimer(mPeriodicSingleScanInterval); |
| } |
| } |
| |
| // Reset the last periodic single scan time stamp so that the next periodic single |
| // scan can start immediately. |
| private void resetLastPeriodicSingleScanTimeStamp() { |
| mLastPeriodicSingleScanTimeStamp = RESET_TIME_STAMP; |
| } |
| |
| // Periodic scan timer handler |
| private void periodicScanTimerHandler() { |
| localLog("periodicScanTimerHandler"); |
| |
| // Schedule the next timer and start a single scan if screen is on. |
| if (mScreenOn) { |
| startPeriodicSingleScan(); |
| } |
| } |
| |
| // Start a single scan |
| private void startSingleScan(boolean isFullBandScan, WorkSource workSource) { |
| if (!mWifiEnabled || !mWifiConnectivityManagerEnabled) { |
| return; |
| } |
| |
| mPnoScanListener.resetLowRssiNetworkRetryDelay(); |
| |
| ScanSettings settings = new ScanSettings(); |
| if (!isFullBandScan) { |
| if (!setScanChannels(settings)) { |
| isFullBandScan = true; |
| } |
| } |
| settings.type = WifiScanner.TYPE_HIGH_ACCURACY; // always do high accuracy scans. |
| settings.band = getScanBand(isFullBandScan); |
| settings.reportEvents = WifiScanner.REPORT_EVENT_FULL_SCAN_RESULT |
| | WifiScanner.REPORT_EVENT_AFTER_EACH_SCAN; |
| settings.numBssidsPerScan = 0; |
| |
| List<ScanSettings.HiddenNetwork> hiddenNetworkList = |
| mConfigManager.retrieveHiddenNetworkList(); |
| settings.hiddenNetworks = |
| hiddenNetworkList.toArray(new ScanSettings.HiddenNetwork[hiddenNetworkList.size()]); |
| |
| SingleScanListener singleScanListener = |
| new SingleScanListener(isFullBandScan); |
| mScanner.startScan(settings, singleScanListener, workSource); |
| mWifiMetrics.incrementConnectivityOneshotScanCount(); |
| } |
| |
| // Start a periodic scan when screen is on |
| private void startPeriodicScan(boolean scanImmediately) { |
| mPnoScanListener.resetLowRssiNetworkRetryDelay(); |
| |
| // No connectivity scan if auto roaming is disabled. |
| if (mWifiState == WIFI_STATE_CONNECTED && !mEnableAutoJoinWhenAssociated) { |
| return; |
| } |
| |
| // Due to b/28020168, timer based single scan will be scheduled |
| // to provide periodic scan in an exponential backoff fashion. |
| if (scanImmediately) { |
| resetLastPeriodicSingleScanTimeStamp(); |
| } |
| mPeriodicSingleScanInterval = PERIODIC_SCAN_INTERVAL_MS; |
| startPeriodicSingleScan(); |
| } |
| |
| private static int deviceMobilityStateToPnoScanIntervalMs(@DeviceMobilityState int state) { |
| switch (state) { |
| case WifiManager.DEVICE_MOBILITY_STATE_UNKNOWN: |
| case WifiManager.DEVICE_MOBILITY_STATE_LOW_MVMT: |
| case WifiManager.DEVICE_MOBILITY_STATE_HIGH_MVMT: |
| return MOVING_PNO_SCAN_INTERVAL_MS; |
| case WifiManager.DEVICE_MOBILITY_STATE_STATIONARY: |
| return STATIONARY_PNO_SCAN_INTERVAL_MS; |
| default: |
| return -1; |
| } |
| } |
| |
| /** |
| * Alters the PNO scan interval based on the current device mobility state. |
| * If the device is stationary, it will likely not find many new Wifi networks. Thus, increase |
| * the interval between scans. Decrease the interval between scans if the device begins to move |
| * again. |
| * @param newState the new device mobility state |
| */ |
| public void setDeviceMobilityState(@DeviceMobilityState int newState) { |
| int newPnoScanIntervalMs = deviceMobilityStateToPnoScanIntervalMs(newState); |
| if (newPnoScanIntervalMs < 0) { |
| Log.e(TAG, "Invalid device mobility state: " + newState); |
| return; |
| } |
| |
| if (newPnoScanIntervalMs == mPnoScanIntervalMs) { |
| if (mPnoScanStarted) { |
| mWifiMetrics.logPnoScanStop(); |
| mWifiMetrics.enterDeviceMobilityState(newState); |
| mWifiMetrics.logPnoScanStart(); |
| } else { |
| mWifiMetrics.enterDeviceMobilityState(newState); |
| } |
| } else { |
| mPnoScanIntervalMs = newPnoScanIntervalMs; |
| Log.d(TAG, "PNO Scan Interval changed to " + mPnoScanIntervalMs + " ms."); |
| |
| if (mPnoScanStarted) { |
| Log.d(TAG, "Restarting PNO Scan with new scan interval"); |
| stopPnoScan(); |
| mWifiMetrics.enterDeviceMobilityState(newState); |
| startDisconnectedPnoScan(); |
| } else { |
| mWifiMetrics.enterDeviceMobilityState(newState); |
| } |
| } |
| } |
| |
| // Start a DisconnectedPNO scan when screen is off and Wifi is disconnected |
| private void startDisconnectedPnoScan() { |
| // Initialize PNO settings |
| PnoSettings pnoSettings = new PnoSettings(); |
| List<PnoSettings.PnoNetwork> pnoNetworkList = mConfigManager.retrievePnoNetworkList(); |
| int listSize = pnoNetworkList.size(); |
| |
| if (listSize == 0) { |
| // No saved network |
| localLog("No saved network for starting disconnected PNO."); |
| return; |
| } |
| |
| pnoSettings.networkList = new PnoSettings.PnoNetwork[listSize]; |
| pnoSettings.networkList = pnoNetworkList.toArray(pnoSettings.networkList); |
| pnoSettings.min5GHzRssi = mScoringParams.getEntryRssi(ScoringParams.BAND5); |
| pnoSettings.min24GHzRssi = mScoringParams.getEntryRssi(ScoringParams.BAND2); |
| pnoSettings.initialScoreMax = initialScoreMax(); |
| pnoSettings.currentConnectionBonus = mCurrentConnectionBonus; |
| pnoSettings.sameNetworkBonus = mSameNetworkBonus; |
| pnoSettings.secureBonus = mSecureBonus; |
| pnoSettings.band5GHzBonus = mBand5GHzBonus; |
| |
| // Initialize scan settings |
| ScanSettings scanSettings = new ScanSettings(); |
| scanSettings.band = getScanBand(); |
| scanSettings.reportEvents = WifiScanner.REPORT_EVENT_NO_BATCH; |
| scanSettings.numBssidsPerScan = 0; |
| scanSettings.periodInMs = mPnoScanIntervalMs; |
| |
| mPnoScanListener.clearScanDetails(); |
| |
| mScanner.startDisconnectedPnoScan(scanSettings, pnoSettings, mPnoScanListener); |
| mPnoScanStarted = true; |
| mWifiMetrics.logPnoScanStart(); |
| } |
| |
| // Stop PNO scan. |
| private void stopPnoScan() { |
| if (!mPnoScanStarted) return; |
| |
| mScanner.stopPnoScan(mPnoScanListener); |
| mPnoScanStarted = false; |
| mWifiMetrics.logPnoScanStop(); |
| } |
| |
| // Set up watchdog timer |
| private void scheduleWatchdogTimer() { |
| localLog("scheduleWatchdogTimer"); |
| |
| mAlarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, |
| mClock.getElapsedSinceBootMillis() + WATCHDOG_INTERVAL_MS, |
| WATCHDOG_TIMER_TAG, |
| mWatchdogListener, mEventHandler); |
| } |
| |
| // Set up periodic scan timer |
| private void schedulePeriodicScanTimer(int intervalMs) { |
| mAlarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, |
| mClock.getElapsedSinceBootMillis() + intervalMs, |
| PERIODIC_SCAN_TIMER_TAG, |
| mPeriodicScanTimerListener, mEventHandler); |
| mPeriodicScanTimerSet = true; |
| } |
| |
| // Cancel periodic scan timer |
| private void cancelPeriodicScanTimer() { |
| if (mPeriodicScanTimerSet) { |
| mAlarmManager.cancel(mPeriodicScanTimerListener); |
| mPeriodicScanTimerSet = false; |
| } |
| } |
| |
| // Set up timer to start a delayed single scan after RESTART_SCAN_DELAY_MS |
| private void scheduleDelayedSingleScan(boolean isFullBandScan) { |
| localLog("scheduleDelayedSingleScan"); |
| |
| RestartSingleScanListener restartSingleScanListener = |
| new RestartSingleScanListener(isFullBandScan); |
| mAlarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, |
| mClock.getElapsedSinceBootMillis() + RESTART_SCAN_DELAY_MS, |
| RESTART_SINGLE_SCAN_TIMER_TAG, |
| restartSingleScanListener, mEventHandler); |
| } |
| |
| // Set up timer to start a delayed scan after msFromNow milli-seconds |
| private void scheduleDelayedConnectivityScan(int msFromNow) { |
| localLog("scheduleDelayedConnectivityScan"); |
| |
| mAlarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, |
| mClock.getElapsedSinceBootMillis() + msFromNow, |
| RESTART_CONNECTIVITY_SCAN_TIMER_TAG, |
| mRestartScanListener, mEventHandler); |
| |
| } |
| |
| // Start a connectivity scan. The scan method is chosen according to |
| // the current screen state and WiFi state. |
| private void startConnectivityScan(boolean scanImmediately) { |
| localLog("startConnectivityScan: screenOn=" + mScreenOn |
| + " wifiState=" + stateToString(mWifiState) |
| + " scanImmediately=" + scanImmediately |
| + " wifiEnabled=" + mWifiEnabled |
| + " wifiConnectivityManagerEnabled=" |
| + mWifiConnectivityManagerEnabled); |
| |
| if (!mWifiEnabled || !mWifiConnectivityManagerEnabled) { |
| return; |
| } |
| |
| // Always stop outstanding connecivity scan if there is any |
| stopConnectivityScan(); |
| |
| // Don't start a connectivity scan while Wifi is in the transition |
| // between connected and disconnected states. |
| if (mWifiState != WIFI_STATE_CONNECTED && mWifiState != WIFI_STATE_DISCONNECTED) { |
| return; |
| } |
| |
| if (mScreenOn) { |
| startPeriodicScan(scanImmediately); |
| } else { |
| if (mWifiState == WIFI_STATE_DISCONNECTED && !mPnoScanStarted) { |
| startDisconnectedPnoScan(); |
| } |
| } |
| |
| } |
| |
| // Stop connectivity scan if there is any. |
| private void stopConnectivityScan() { |
| // Due to b/28020168, timer based single scan will be scheduled |
| // to provide periodic scan in an exponential backoff fashion. |
| cancelPeriodicScanTimer(); |
| stopPnoScan(); |
| mScanRestartCount = 0; |
| } |
| |
| /** |
| * Handler for screen state (on/off) changes |
| */ |
| public void handleScreenStateChanged(boolean screenOn) { |
| localLog("handleScreenStateChanged: screenOn=" + screenOn); |
| |
| mScreenOn = screenOn; |
| |
| mOpenNetworkNotifier.handleScreenStateChanged(screenOn); |
| mCarrierNetworkNotifier.handleScreenStateChanged(screenOn); |
| |
| startConnectivityScan(SCAN_ON_SCHEDULE); |
| } |
| |
| /** |
| * Helper function that converts the WIFI_STATE_XXX constants to string |
| */ |
| private static String stateToString(int state) { |
| switch (state) { |
| case WIFI_STATE_CONNECTED: |
| return "connected"; |
| case WIFI_STATE_DISCONNECTED: |
| return "disconnected"; |
| case WIFI_STATE_TRANSITIONING: |
| return "transitioning"; |
| default: |
| return "unknown"; |
| } |
| } |
| |
| /** |
| * Handler for WiFi state (connected/disconnected) changes |
| */ |
| public void handleConnectionStateChanged(int state) { |
| localLog("handleConnectionStateChanged: state=" + stateToString(state)); |
| |
| mWifiState = state; |
| |
| // Reset BSSID of last connection attempt and kick off |
| // the watchdog timer if entering disconnected state. |
| if (mWifiState == WIFI_STATE_DISCONNECTED) { |
| mLastConnectionAttemptBssid = null; |
| scheduleWatchdogTimer(); |
| startConnectivityScan(SCAN_IMMEDIATELY); |
| } else { |
| startConnectivityScan(SCAN_ON_SCHEDULE); |
| } |
| } |
| |
| /** |
| * Handler when a WiFi connection attempt ended. |
| * |
| * @param failureCode {@link WifiMetrics.ConnectionEvent} failure code. |
| */ |
| public void handleConnectionAttemptEnded(int failureCode) { |
| if (failureCode == WifiMetrics.ConnectionEvent.FAILURE_NONE) { |
| String ssid = (mWifiInfo.getWifiSsid() == null) |
| ? null |
| : mWifiInfo.getWifiSsid().toString(); |
| mOpenNetworkNotifier.handleWifiConnected(ssid); |
| mCarrierNetworkNotifier.handleWifiConnected(ssid); |
| } else { |
| mOpenNetworkNotifier.handleConnectionFailure(); |
| mCarrierNetworkNotifier.handleConnectionFailure(); |
| } |
| } |
| |
| // Enable auto-join if we have any pending network request (trusted or untrusted) and no |
| // specific network request in progress. |
| private void checkStateAndEnable() { |
| enable(!mSpecificNetworkRequestInProgress |
| && (mUntrustedConnectionAllowed || mTrustedConnectionAllowed)); |
| startConnectivityScan(SCAN_IMMEDIATELY); |
| } |
| |
| /** |
| * Triggered when {@link WifiNetworkFactory} has a pending general network request. |
| */ |
| public void setTrustedConnectionAllowed(boolean allowed) { |
| localLog("setTrustedConnectionAllowed: allowed=" + allowed); |
| |
| if (mTrustedConnectionAllowed != allowed) { |
| mTrustedConnectionAllowed = allowed; |
| checkStateAndEnable(); |
| } |
| } |
| |
| |
| /** |
| * Triggered when {@link UntrustedWifiNetworkFactory} has a pending ephemeral network request. |
| */ |
| public void setUntrustedConnectionAllowed(boolean allowed) { |
| localLog("setUntrustedConnectionAllowed: allowed=" + allowed); |
| |
| if (mUntrustedConnectionAllowed != allowed) { |
| mUntrustedConnectionAllowed = allowed; |
| checkStateAndEnable(); |
| } |
| } |
| |
| /** |
| * Triggered when {@link WifiNetworkFactory} is processing a specific network request. |
| */ |
| public void setSpecificNetworkRequestInProgress(boolean inProgress) { |
| localLog("setsetSpecificNetworkRequestInProgress : inProgress=" + inProgress); |
| |
| if (mSpecificNetworkRequestInProgress != inProgress) { |
| mSpecificNetworkRequestInProgress = inProgress; |
| checkStateAndEnable(); |
| } |
| } |
| |
| /** |
| * Handler when user specifies a particular network to connect to |
| */ |
| public void setUserConnectChoice(int netId) { |
| localLog("setUserConnectChoice: netId=" + netId); |
| |
| mNetworkSelector.setUserConnectChoice(netId); |
| } |
| |
| /** |
| * Handler to prepare for connection to a user or app specified network |
| */ |
| public void prepareForForcedConnection(int netId) { |
| localLog("prepareForForcedConnection: netId=" + netId); |
| |
| clearConnectionAttemptTimeStamps(); |
| clearBssidBlacklist(); |
| } |
| |
| /** |
| * Handler for on-demand connectivity scan |
| */ |
| public void forceConnectivityScan(WorkSource workSource) { |
| localLog("forceConnectivityScan in request of " + workSource); |
| |
| mWaitForFullBandScanResults = true; |
| startSingleScan(true, workSource); |
| } |
| |
| /** |
| * Update the BSSID blacklist when a BSSID is enabled or disabled |
| * |
| * @param bssid the bssid to be enabled/disabled |
| * @param enable -- true enable the bssid |
| * -- false disable the bssid |
| * @param reasonCode enable/disable reason code |
| * @return true if blacklist is updated; false otherwise |
| */ |
| private boolean updateBssidBlacklist(String bssid, boolean enable, int reasonCode) { |
| // Remove the bssid from blacklist when it is enabled. |
| if (enable) { |
| return mBssidBlacklist.remove(bssid) != null; |
| } |
| |
| // Do not update BSSID blacklist with information if this is the only |
| // BSSID for its SSID. By ignoring it we will cause additional failures |
| // which will trigger Watchdog. |
| if (mWifiLastResortWatchdog.shouldIgnoreBssidUpdate(bssid)) { |
| localLog("Ignore update Bssid Blacklist since Watchdog trigger is activated"); |
| return false; |
| } |
| |
| // Update the bssid's blacklist status when it is disabled because of |
| // association rejection. |
| BssidBlacklistStatus status = mBssidBlacklist.get(bssid); |
| if (status == null) { |
| // First time for this BSSID |
| status = new BssidBlacklistStatus(); |
| mBssidBlacklist.put(bssid, status); |
| } |
| |
| status.blacklistedTimeStamp = mClock.getElapsedSinceBootMillis(); |
| status.counter++; |
| if (!status.isBlacklisted) { |
| if (status.counter >= BSSID_BLACKLIST_THRESHOLD |
| || reasonCode == REASON_CODE_AP_UNABLE_TO_HANDLE_NEW_STA) { |
| status.isBlacklisted = true; |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Track whether a BSSID should be enabled or disabled for WifiNetworkSelector |
| * |
| * @param bssid the bssid to be enabled/disabled |
| * @param enable -- true enable the bssid |
| * -- false disable the bssid |
| * @param reasonCode enable/disable reason code |
| * @return true if blacklist is updated; false otherwise |
| */ |
| public boolean trackBssid(String bssid, boolean enable, int reasonCode) { |
| localLog("trackBssid: " + (enable ? "enable " : "disable ") + bssid + " reason code " |
| + reasonCode); |
| |
| if (bssid == null) { |
| return false; |
| } |
| |
| if (!updateBssidBlacklist(bssid, enable, reasonCode)) { |
| return false; |
| } |
| |
| // Blacklist was updated, so update firmware roaming configuration. |
| updateFirmwareRoamingConfiguration(); |
| |
| if (!enable) { |
| // Disabling a BSSID can happen when connection to the AP was rejected. |
| // We start another scan immediately so that WifiNetworkSelector can |
| // give us another candidate to connect to. |
| startConnectivityScan(SCAN_IMMEDIATELY); |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Check whether a bssid is disabled |
| */ |
| @VisibleForTesting |
| public boolean isBssidDisabled(String bssid) { |
| BssidBlacklistStatus status = mBssidBlacklist.get(bssid); |
| return status == null ? false : status.isBlacklisted; |
| } |
| |
| /** |
| * Compile and return a hashset of the blacklisted BSSIDs |
| */ |
| private HashSet<String> buildBssidBlacklist() { |
| HashSet<String> blacklistedBssids = new HashSet<String>(); |
| for (String bssid : mBssidBlacklist.keySet()) { |
| if (isBssidDisabled(bssid)) { |
| blacklistedBssids.add(bssid); |
| } |
| } |
| |
| return blacklistedBssids; |
| } |
| |
| /** |
| * Update firmware roaming configuration if the firmware roaming feature is supported. |
| * Compile and write the BSSID blacklist only. TODO(b/36488259): SSID whitelist is always |
| * empty for now. |
| */ |
| private void updateFirmwareRoamingConfiguration() { |
| if (!mConnectivityHelper.isFirmwareRoamingSupported()) { |
| return; |
| } |
| |
| int maxBlacklistSize = mConnectivityHelper.getMaxNumBlacklistBssid(); |
| if (maxBlacklistSize <= 0) { |
| Log.wtf(TAG, "Invalid max BSSID blacklist size: " + maxBlacklistSize); |
| return; |
| } |
| |
| ArrayList<String> blacklistedBssids = new ArrayList<String>(buildBssidBlacklist()); |
| int blacklistSize = blacklistedBssids.size(); |
| |
| if (blacklistSize > maxBlacklistSize) { |
| Log.wtf(TAG, "Attempt to write " + blacklistSize + " blacklisted BSSIDs, max size is " |
| + maxBlacklistSize); |
| |
| blacklistedBssids = new ArrayList<String>(blacklistedBssids.subList(0, |
| maxBlacklistSize)); |
| localLog("Trim down BSSID blacklist size from " + blacklistSize + " to " |
| + blacklistedBssids.size()); |
| } |
| |
| if (!mConnectivityHelper.setFirmwareRoamingConfiguration(blacklistedBssids, |
| new ArrayList<String>())) { // TODO(b/36488259): SSID whitelist management. |
| localLog("Failed to set firmware roaming configuration."); |
| } |
| } |
| |
| /** |
| * Refresh the BSSID blacklist |
| * |
| * Go through the BSSID blacklist and check if a BSSID has been blacklisted for |
| * BSSID_BLACKLIST_EXPIRE_TIME_MS. If yes, re-enable it. |
| */ |
| private void refreshBssidBlacklist() { |
| if (mBssidBlacklist.isEmpty()) { |
| return; |
| } |
| |
| boolean updated = false; |
| Iterator<BssidBlacklistStatus> iter = mBssidBlacklist.values().iterator(); |
| Long currentTimeStamp = mClock.getElapsedSinceBootMillis(); |
| |
| while (iter.hasNext()) { |
| BssidBlacklistStatus status = iter.next(); |
| if (status.isBlacklisted && ((currentTimeStamp - status.blacklistedTimeStamp) |
| >= BSSID_BLACKLIST_EXPIRE_TIME_MS)) { |
| iter.remove(); |
| updated = true; |
| } |
| } |
| |
| if (updated) { |
| updateFirmwareRoamingConfiguration(); |
| } |
| } |
| |
| /** |
| * Helper method to populate WifiScanner handle. This is done lazily because |
| * WifiScanningService is started after WifiService. |
| */ |
| private void retrieveWifiScanner() { |
| if (mScanner != null) return; |
| mScanner = mWifiInjector.getWifiScanner(); |
| checkNotNull(mScanner); |
| // Register for all single scan results |
| mScanner.registerScanListener(mAllSingleScanListener); |
| } |
| |
| |
| /** |
| * Clear the BSSID blacklist |
| */ |
| private void clearBssidBlacklist() { |
| mBssidBlacklist.clear(); |
| updateFirmwareRoamingConfiguration(); |
| } |
| |
| /** |
| * Start WifiConnectivityManager |
| */ |
| private void start() { |
| if (mRunning) return; |
| retrieveWifiScanner(); |
| mConnectivityHelper.getFirmwareRoamingInfo(); |
| clearBssidBlacklist(); |
| mRunning = true; |
| } |
| |
| /** |
| * Stop and reset WifiConnectivityManager |
| */ |
| private void stop() { |
| if (!mRunning) return; |
| mRunning = false; |
| stopConnectivityScan(); |
| clearBssidBlacklist(); |
| resetLastPeriodicSingleScanTimeStamp(); |
| mOpenNetworkNotifier.clearPendingNotification(true /* resetRepeatDelay */); |
| mCarrierNetworkNotifier.clearPendingNotification(true /* resetRepeatDelay */); |
| mLastConnectionAttemptBssid = null; |
| mWaitForFullBandScanResults = false; |
| } |
| |
| /** |
| * Update WifiConnectivityManager running state |
| * |
| * Start WifiConnectivityManager only if both Wifi and WifiConnectivityManager |
| * are enabled, otherwise stop it. |
| */ |
| private void updateRunningState() { |
| if (mWifiEnabled && mWifiConnectivityManagerEnabled) { |
| localLog("Starting up WifiConnectivityManager"); |
| start(); |
| } else { |
| localLog("Stopping WifiConnectivityManager"); |
| stop(); |
| } |
| } |
| |
| /** |
| * Inform WiFi is enabled for connection or not |
| */ |
| public void setWifiEnabled(boolean enable) { |
| localLog("Set WiFi " + (enable ? "enabled" : "disabled")); |
| |
| mWifiEnabled = enable; |
| updateRunningState(); |
| } |
| |
| /** |
| * Turn on/off the WifiConnectivityManager at runtime |
| */ |
| public void enable(boolean enable) { |
| localLog("Set WiFiConnectivityManager " + (enable ? "enabled" : "disabled")); |
| |
| mWifiConnectivityManagerEnabled = enable; |
| updateRunningState(); |
| } |
| |
| @VisibleForTesting |
| int getLowRssiNetworkRetryDelay() { |
| return mPnoScanListener.getLowRssiNetworkRetryDelay(); |
| } |
| |
| @VisibleForTesting |
| long getLastPeriodicSingleScanTimeStamp() { |
| return mLastPeriodicSingleScanTimeStamp; |
| } |
| |
| /** |
| * Dump the local logs. |
| */ |
| public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| pw.println("Dump of WifiConnectivityManager"); |
| pw.println("WifiConnectivityManager - Log Begin ----"); |
| mLocalLog.dump(fd, pw, args); |
| pw.println("WifiConnectivityManager - Log End ----"); |
| mOpenNetworkNotifier.dump(fd, pw, args); |
| mCarrierNetworkNotifier.dump(fd, pw, args); |
| mCarrierNetworkConfig.dump(fd, pw, args); |
| } |
| } |
