/* * Copyright (C) 2008 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; import static android.Manifest.permission.RECEIVE_DATA_ACTIVITY_CHANGE; import static android.content.pm.PackageManager.PERMISSION_GRANTED; import static android.net.ConnectivityDiagnosticsManager.ConnectivityReport.KEY_NETWORK_PROBES_ATTEMPTED_BITMASK; import static android.net.ConnectivityDiagnosticsManager.ConnectivityReport.KEY_NETWORK_PROBES_SUCCEEDED_BITMASK; import static android.net.ConnectivityDiagnosticsManager.ConnectivityReport.KEY_NETWORK_VALIDATION_RESULT; import static android.net.ConnectivityDiagnosticsManager.DataStallReport.DETECTION_METHOD_DNS_EVENTS; import static android.net.ConnectivityDiagnosticsManager.DataStallReport.DETECTION_METHOD_TCP_METRICS; import static android.net.ConnectivityDiagnosticsManager.DataStallReport.KEY_DNS_CONSECUTIVE_TIMEOUTS; import static android.net.ConnectivityDiagnosticsManager.DataStallReport.KEY_TCP_METRICS_COLLECTION_PERIOD_MILLIS; import static android.net.ConnectivityDiagnosticsManager.DataStallReport.KEY_TCP_PACKET_FAIL_RATE; import static android.net.ConnectivityManager.CONNECTIVITY_ACTION; import static android.net.ConnectivityManager.NETID_UNSET; import static android.net.ConnectivityManager.PRIVATE_DNS_MODE_OPPORTUNISTIC; import static android.net.ConnectivityManager.TYPE_ETHERNET; import static android.net.ConnectivityManager.TYPE_NONE; import static android.net.ConnectivityManager.TYPE_VPN; import static android.net.ConnectivityManager.getNetworkTypeName; import static android.net.ConnectivityManager.isNetworkTypeValid; import static android.net.INetworkMonitor.NETWORK_VALIDATION_PROBE_PRIVDNS; import static android.net.INetworkMonitor.NETWORK_VALIDATION_RESULT_PARTIAL; import static android.net.INetworkMonitor.NETWORK_VALIDATION_RESULT_VALID; import static android.net.NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL; import static android.net.NetworkCapabilities.NET_CAPABILITY_FOREGROUND; import static android.net.NetworkCapabilities.NET_CAPABILITY_INTERNET; import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_METERED; import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED; import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_ROAMING; import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_SUSPENDED; import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_VPN; import static android.net.NetworkCapabilities.NET_CAPABILITY_PARTIAL_CONNECTIVITY; import static android.net.NetworkCapabilities.NET_CAPABILITY_VALIDATED; import static android.net.NetworkCapabilities.TRANSPORT_CELLULAR; import static android.net.NetworkCapabilities.TRANSPORT_TEST; import static android.net.NetworkCapabilities.TRANSPORT_VPN; import static android.net.NetworkPolicyManager.RULE_NONE; import static android.net.NetworkPolicyManager.uidRulesToString; import static android.net.shared.NetworkMonitorUtils.isPrivateDnsValidationRequired; import static android.os.Process.INVALID_UID; import static android.system.OsConstants.IPPROTO_TCP; import static android.system.OsConstants.IPPROTO_UDP; import static java.util.Map.Entry; import android.Manifest; import android.annotation.NonNull; import android.annotation.Nullable; import android.app.AppOpsManager; import android.app.BroadcastOptions; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.BroadcastReceiver; import android.content.ComponentName; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.pm.PackageManager; import android.content.res.Configuration; import android.database.ContentObserver; import android.net.CaptivePortal; import android.net.CaptivePortalData; import android.net.ConnectionInfo; import android.net.ConnectivityDiagnosticsManager.ConnectivityReport; import android.net.ConnectivityDiagnosticsManager.DataStallReport; import android.net.ConnectivityManager; import android.net.DataStallReportParcelable; import android.net.ICaptivePortal; import android.net.IConnectivityDiagnosticsCallback; import android.net.IConnectivityManager; import android.net.IDnsResolver; import android.net.IIpConnectivityMetrics; import android.net.INetd; import android.net.INetdEventCallback; import android.net.INetworkManagementEventObserver; import android.net.INetworkMonitor; import android.net.INetworkMonitorCallbacks; import android.net.INetworkPolicyListener; import android.net.INetworkPolicyManager; import android.net.INetworkStatsService; import android.net.ISocketKeepaliveCallback; import android.net.InetAddresses; import android.net.IpMemoryStore; import android.net.IpPrefix; import android.net.LinkProperties; import android.net.MatchAllNetworkSpecifier; import android.net.NattSocketKeepalive; import android.net.Network; import android.net.NetworkAgent; import android.net.NetworkAgentConfig; import android.net.NetworkCapabilities; import android.net.NetworkConfig; import android.net.NetworkInfo; import android.net.NetworkInfo.DetailedState; import android.net.NetworkMonitorManager; import android.net.NetworkPolicyManager; import android.net.NetworkProvider; import android.net.NetworkQuotaInfo; import android.net.NetworkRequest; import android.net.NetworkSpecifier; import android.net.NetworkStack; import android.net.NetworkStackClient; import android.net.NetworkState; import android.net.NetworkTestResultParcelable; import android.net.NetworkUtils; import android.net.NetworkWatchlistManager; import android.net.PrivateDnsConfigParcel; import android.net.ProxyInfo; import android.net.RouteInfo; import android.net.RouteInfoParcel; import android.net.SocketKeepalive; import android.net.TetheringManager; import android.net.UidRange; import android.net.Uri; import android.net.VpnManager; import android.net.VpnService; import android.net.metrics.IpConnectivityLog; import android.net.metrics.NetworkEvent; import android.net.netlink.InetDiagMessage; import android.net.shared.PrivateDnsConfig; import android.net.util.LinkPropertiesUtils.CompareOrUpdateResult; import android.net.util.LinkPropertiesUtils.CompareResult; import android.net.util.MultinetworkPolicyTracker; import android.net.util.NetdService; import android.os.Binder; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.os.HandlerThread; import android.os.IBinder; import android.os.INetworkManagementService; import android.os.Looper; import android.os.Message; import android.os.Messenger; import android.os.ParcelFileDescriptor; import android.os.Parcelable; import android.os.PersistableBundle; import android.os.PowerManager; import android.os.Process; import android.os.RemoteException; import android.os.ResultReceiver; import android.os.ServiceManager; import android.os.ServiceSpecificException; import android.os.ShellCallback; import android.os.ShellCommand; import android.os.SystemClock; import android.os.SystemProperties; import android.os.UserHandle; import android.os.UserManager; import android.provider.Settings; import android.security.Credentials; import android.security.KeyStore; import android.telephony.TelephonyManager; import android.text.TextUtils; import android.util.ArraySet; import android.util.LocalLog; import android.util.Log; import android.util.Pair; import android.util.Slog; import android.util.SparseArray; import android.util.SparseIntArray; import android.util.Xml; 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.logging.MetricsLogger; import com.android.internal.net.LegacyVpnInfo; import com.android.internal.net.VpnConfig; import com.android.internal.net.VpnInfo; import com.android.internal.net.VpnProfile; import com.android.internal.util.ArrayUtils; import com.android.internal.util.AsyncChannel; import com.android.internal.util.DumpUtils; import com.android.internal.util.IndentingPrintWriter; import com.android.internal.util.LocationPermissionChecker; import com.android.internal.util.MessageUtils; import com.android.internal.util.XmlUtils; import com.android.server.am.BatteryStatsService; import com.android.server.connectivity.AutodestructReference; import com.android.server.connectivity.DataConnectionStats; import com.android.server.connectivity.DnsManager; import com.android.server.connectivity.DnsManager.PrivateDnsValidationUpdate; import com.android.server.connectivity.IpConnectivityMetrics; import com.android.server.connectivity.KeepaliveTracker; import com.android.server.connectivity.LingerMonitor; import com.android.server.connectivity.MockableSystemProperties; import com.android.server.connectivity.MultipathPolicyTracker; import com.android.server.connectivity.NetworkAgentInfo; import com.android.server.connectivity.NetworkDiagnostics; import com.android.server.connectivity.NetworkNotificationManager; import com.android.server.connectivity.NetworkNotificationManager.NotificationType; import com.android.server.connectivity.NetworkRanker; import com.android.server.connectivity.PermissionMonitor; import com.android.server.connectivity.ProxyTracker; import com.android.server.connectivity.Vpn; import com.android.server.net.BaseNetdEventCallback; import com.android.server.net.BaseNetworkObserver; import com.android.server.net.LockdownVpnTracker; import com.android.server.net.NetworkPolicyManagerInternal; import com.android.server.utils.PriorityDump; import com.google.android.collect.Lists; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import java.io.File; 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.net.UnknownHostException; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.Comparator; import java.util.ConcurrentModificationException; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Objects; import java.util.Set; import java.util.SortedSet; import java.util.StringJoiner; import java.util.TreeSet; import java.util.concurrent.atomic.AtomicInteger; /** * @hide */ public class ConnectivityService extends IConnectivityManager.Stub implements PendingIntent.OnFinished { private static final String TAG = ConnectivityService.class.getSimpleName(); private static final String DIAG_ARG = "--diag"; public static final String SHORT_ARG = "--short"; private static final String NETWORK_ARG = "networks"; private static final String REQUEST_ARG = "requests"; private static final boolean DBG = true; private static final boolean DDBG = Log.isLoggable(TAG, Log.DEBUG); private static final boolean VDBG = Log.isLoggable(TAG, Log.VERBOSE); private static final boolean LOGD_BLOCKED_NETWORKINFO = true; /** * Default URL to use for {@link #getCaptivePortalServerUrl()}. This should not be changed * by OEMs for configuration purposes, as this value is overridden by * Settings.Global.CAPTIVE_PORTAL_HTTP_URL. * R.string.config_networkCaptivePortalServerUrl should be overridden instead for this purpose * (preferably via runtime resource overlays). */ private static final String DEFAULT_CAPTIVE_PORTAL_HTTP_URL = "http://connectivitycheck.gstatic.com/generate_204"; // TODO: create better separation between radio types and network types // how long to wait before switching back to a radio's default network private static final int RESTORE_DEFAULT_NETWORK_DELAY = 1 * 60 * 1000; // system property that can override the above value private static final String NETWORK_RESTORE_DELAY_PROP_NAME = "android.telephony.apn-restore"; // How long to wait before putting up a "This network doesn't have an Internet connection, // connect anyway?" dialog after the user selects a network that doesn't validate. private static final int PROMPT_UNVALIDATED_DELAY_MS = 8 * 1000; // Default to 30s linger time-out. Modifiable only for testing. private static final String LINGER_DELAY_PROPERTY = "persist.netmon.linger"; private static final int DEFAULT_LINGER_DELAY_MS = 30_000; @VisibleForTesting protected int mLingerDelayMs; // Can't be final, or test subclass constructors can't change it. // How long to delay to removal of a pending intent based request. // See Settings.Secure.CONNECTIVITY_RELEASE_PENDING_INTENT_DELAY_MS private final int mReleasePendingIntentDelayMs; private MockableSystemProperties mSystemProperties; @VisibleForTesting protected final PermissionMonitor mPermissionMonitor; private KeyStore mKeyStore; @VisibleForTesting @GuardedBy("mVpns") protected final SparseArray mVpns = new SparseArray<>(); // TODO: investigate if mLockdownEnabled can be removed and replaced everywhere by // a direct call to LockdownVpnTracker.isEnabled(). @GuardedBy("mVpns") private boolean mLockdownEnabled; @GuardedBy("mVpns") private LockdownVpnTracker mLockdownTracker; /** * Stale copy of uid rules provided by NPMS. As long as they are accessed only in internal * handler thread, they don't need a lock. */ private SparseIntArray mUidRules = new SparseIntArray(); /** Flag indicating if background data is restricted. */ private boolean mRestrictBackground; private final Context mContext; private final Dependencies mDeps; // 0 is full bad, 100 is full good private int mDefaultInetConditionPublished = 0; private INetworkManagementService mNMS; @VisibleForTesting protected IDnsResolver mDnsResolver; @VisibleForTesting protected INetd mNetd; private INetworkStatsService mStatsService; private INetworkPolicyManager mPolicyManager; private NetworkPolicyManagerInternal mPolicyManagerInternal; /** * TestNetworkService (lazily) created upon first usage. Locked to prevent creation of multiple * instances. */ @GuardedBy("mTNSLock") private TestNetworkService mTNS; private final Object mTNSLock = new Object(); private String mCurrentTcpBufferSizes; private static final SparseArray sMagicDecoderRing = MessageUtils.findMessageNames( new Class[] { AsyncChannel.class, ConnectivityService.class, NetworkAgent.class, NetworkAgentInfo.class }); private enum ReapUnvalidatedNetworks { // Tear down networks that have no chance (e.g. even if validated) of becoming // the highest scoring network satisfying a NetworkRequest. This should be passed when // all networks have been rematched against all NetworkRequests. REAP, // Don't reap networks. This should be passed when some networks have not yet been // rematched against all NetworkRequests. DONT_REAP } private enum UnneededFor { LINGER, // Determine whether this network is unneeded and should be lingered. TEARDOWN, // Determine whether this network is unneeded and should be torn down. } /** * used internally to clear a wakelock when transitioning * from one net to another. Clear happens when we get a new * network - EVENT_EXPIRE_NET_TRANSITION_WAKELOCK happens * after a timeout if no network is found (typically 1 min). */ private static final int EVENT_CLEAR_NET_TRANSITION_WAKELOCK = 8; /** * used internally to reload global proxy settings */ private static final int EVENT_APPLY_GLOBAL_HTTP_PROXY = 9; /** * PAC manager has received new port. */ private static final int EVENT_PROXY_HAS_CHANGED = 16; /** * used internally when registering NetworkProviders * obj = NetworkProviderInfo */ private static final int EVENT_REGISTER_NETWORK_PROVIDER = 17; /** * used internally when registering NetworkAgents * obj = Messenger */ private static final int EVENT_REGISTER_NETWORK_AGENT = 18; /** * used to add a network request * includes a NetworkRequestInfo */ private static final int EVENT_REGISTER_NETWORK_REQUEST = 19; /** * indicates a timeout period is over - check if we had a network yet or not * and if not, call the timeout callback (but leave the request live until they * cancel it. * includes a NetworkRequestInfo */ private static final int EVENT_TIMEOUT_NETWORK_REQUEST = 20; /** * used to add a network listener - no request * includes a NetworkRequestInfo */ private static final int EVENT_REGISTER_NETWORK_LISTENER = 21; /** * used to remove a network request, either a listener or a real request * arg1 = UID of caller * obj = NetworkRequest */ private static final int EVENT_RELEASE_NETWORK_REQUEST = 22; /** * used internally when registering NetworkProviders * obj = Messenger */ private static final int EVENT_UNREGISTER_NETWORK_PROVIDER = 23; /** * used internally to expire a wakelock when transitioning * from one net to another. Expire happens when we fail to find * a new network (typically after 1 minute) - * EVENT_CLEAR_NET_TRANSITION_WAKELOCK happens if we had found * a replacement network. */ private static final int EVENT_EXPIRE_NET_TRANSITION_WAKELOCK = 24; /** * Used internally to indicate the system is ready. */ private static final int EVENT_SYSTEM_READY = 25; /** * used to add a network request with a pending intent * obj = NetworkRequestInfo */ private static final int EVENT_REGISTER_NETWORK_REQUEST_WITH_INTENT = 26; /** * used to remove a pending intent and its associated network request. * arg1 = UID of caller * obj = PendingIntent */ private static final int EVENT_RELEASE_NETWORK_REQUEST_WITH_INTENT = 27; /** * used to specify whether a network should be used even if unvalidated. * arg1 = whether to accept the network if it's unvalidated (1 or 0) * arg2 = whether to remember this choice in the future (1 or 0) * obj = network */ private static final int EVENT_SET_ACCEPT_UNVALIDATED = 28; /** * used to ask the user to confirm a connection to an unvalidated network. * obj = network */ private static final int EVENT_PROMPT_UNVALIDATED = 29; /** * used internally to (re)configure always-on networks. */ private static final int EVENT_CONFIGURE_ALWAYS_ON_NETWORKS = 30; /** * used to add a network listener with a pending intent * obj = NetworkRequestInfo */ private static final int EVENT_REGISTER_NETWORK_LISTENER_WITH_INTENT = 31; /** * used to specify whether a network should not be penalized when it becomes unvalidated. */ private static final int EVENT_SET_AVOID_UNVALIDATED = 35; /** * used to trigger revalidation of a network. */ private static final int EVENT_REVALIDATE_NETWORK = 36; // Handle changes in Private DNS settings. private static final int EVENT_PRIVATE_DNS_SETTINGS_CHANGED = 37; // Handle private DNS validation status updates. private static final int EVENT_PRIVATE_DNS_VALIDATION_UPDATE = 38; /** * Used to handle onUidRulesChanged event from NetworkPolicyManagerService. */ private static final int EVENT_UID_RULES_CHANGED = 39; /** * Used to handle onRestrictBackgroundChanged event from NetworkPolicyManagerService. */ private static final int EVENT_DATA_SAVER_CHANGED = 40; /** * Event for NetworkMonitor/NetworkAgentInfo to inform ConnectivityService that the network has * been tested. * obj = {@link NetworkTestedResults} representing information sent from NetworkMonitor. * data = PersistableBundle of extras passed from NetworkMonitor. If {@link * NetworkMonitorCallbacks#notifyNetworkTested} is called, this will be null. */ private static final int EVENT_NETWORK_TESTED = 41; /** * Event for NetworkMonitor/NetworkAgentInfo to inform ConnectivityService that the private DNS * config was resolved. * obj = PrivateDnsConfig * arg2 = netid */ private static final int EVENT_PRIVATE_DNS_CONFIG_RESOLVED = 42; /** * Request ConnectivityService display provisioning notification. * arg1 = Whether to make the notification visible. * arg2 = NetID. * obj = Intent to be launched when notification selected by user, null if !arg1. */ private static final int EVENT_PROVISIONING_NOTIFICATION = 43; /** * Used to specify whether a network should be used even if connectivity is partial. * arg1 = whether to accept the network if its connectivity is partial (1 for true or 0 for * false) * arg2 = whether to remember this choice in the future (1 for true or 0 for false) * obj = network */ private static final int EVENT_SET_ACCEPT_PARTIAL_CONNECTIVITY = 44; /** * Event for NetworkMonitor to inform ConnectivityService that the probe status has changed. * Both of the arguments are bitmasks, and the value of bits come from * INetworkMonitor.NETWORK_VALIDATION_PROBE_*. * arg1 = A bitmask to describe which probes are completed. * arg2 = A bitmask to describe which probes are successful. */ public static final int EVENT_PROBE_STATUS_CHANGED = 45; /** * Event for NetworkMonitor to inform ConnectivityService that captive portal data has changed. * arg1 = unused * arg2 = netId * obj = captive portal data */ private static final int EVENT_CAPPORT_DATA_CHANGED = 46; /** * Argument for {@link #EVENT_PROVISIONING_NOTIFICATION} to indicate that the notification * should be shown. */ private static final int PROVISIONING_NOTIFICATION_SHOW = 1; /** * Argument for {@link #EVENT_PROVISIONING_NOTIFICATION} to indicate that the notification * should be hidden. */ private static final int PROVISIONING_NOTIFICATION_HIDE = 0; private static String eventName(int what) { return sMagicDecoderRing.get(what, Integer.toString(what)); } private static IDnsResolver getDnsResolver() { return IDnsResolver.Stub .asInterface(ServiceManager.getService("dnsresolver")); } /** Handler thread used for all of the handlers below. */ @VisibleForTesting protected final HandlerThread mHandlerThread; /** Handler used for internal events. */ final private InternalHandler mHandler; /** Handler used for incoming {@link NetworkStateTracker} events. */ final private NetworkStateTrackerHandler mTrackerHandler; /** Handler used for processing {@link android.net.ConnectivityDiagnosticsManager} events */ @VisibleForTesting final ConnectivityDiagnosticsHandler mConnectivityDiagnosticsHandler; private final DnsManager mDnsManager; private final NetworkRanker mNetworkRanker; private boolean mSystemReady; private Intent mInitialBroadcast; private PowerManager.WakeLock mNetTransitionWakeLock; private int mNetTransitionWakeLockTimeout; private final PowerManager.WakeLock mPendingIntentWakeLock; // A helper object to track the current default HTTP proxy. ConnectivityService needs to tell // the world when it changes. @VisibleForTesting protected final ProxyTracker mProxyTracker; final private SettingsObserver mSettingsObserver; private UserManager mUserManager; private NetworkConfig[] mNetConfigs; private int mNetworksDefined; // the set of network types that can only be enabled by system/sig apps private List mProtectedNetworks; private Set mWolSupportedInterfaces; private final TelephonyManager mTelephonyManager; private final AppOpsManager mAppOpsManager; private final LocationPermissionChecker mLocationPermissionChecker; private KeepaliveTracker mKeepaliveTracker; private NetworkNotificationManager mNotifier; private LingerMonitor mLingerMonitor; // sequence number of NetworkRequests private int mNextNetworkRequestId = 1; // Sequence number for NetworkProvider IDs. private final AtomicInteger mNextNetworkProviderId = new AtomicInteger( NetworkProvider.FIRST_PROVIDER_ID); // NetworkRequest activity String log entries. private static final int MAX_NETWORK_REQUEST_LOGS = 20; private final LocalLog mNetworkRequestInfoLogs = new LocalLog(MAX_NETWORK_REQUEST_LOGS); // NetworkInfo blocked and unblocked String log entries private static final int MAX_NETWORK_INFO_LOGS = 40; private final LocalLog mNetworkInfoBlockingLogs = new LocalLog(MAX_NETWORK_INFO_LOGS); private static final int MAX_WAKELOCK_LOGS = 20; private final LocalLog mWakelockLogs = new LocalLog(MAX_WAKELOCK_LOGS); private int mTotalWakelockAcquisitions = 0; private int mTotalWakelockReleases = 0; private long mTotalWakelockDurationMs = 0; private long mMaxWakelockDurationMs = 0; private long mLastWakeLockAcquireTimestamp = 0; private final IpConnectivityLog mMetricsLog; @GuardedBy("mBandwidthRequests") private final SparseArray mBandwidthRequests = new SparseArray(10); @VisibleForTesting final MultinetworkPolicyTracker mMultinetworkPolicyTracker; @VisibleForTesting final MultipathPolicyTracker mMultipathPolicyTracker; @VisibleForTesting final Map mConnectivityDiagnosticsCallbacks = new HashMap<>(); /** * Implements support for the legacy "one network per network type" model. * * We used to have a static array of NetworkStateTrackers, one for each * network type, but that doesn't work any more now that we can have, * for example, more that one wifi network. This class stores all the * NetworkAgentInfo objects that support a given type, but the legacy * API will only see the first one. * * It serves two main purposes: * * 1. Provide information about "the network for a given type" (since this * API only supports one). * 2. Send legacy connectivity change broadcasts. Broadcasts are sent if * the first network for a given type changes, or if the default network * changes. */ @VisibleForTesting static class LegacyTypeTracker { private static final boolean DBG = true; private static final boolean VDBG = false; /** * Array of lists, one per legacy network type (e.g., TYPE_MOBILE_MMS). * Each list holds references to all NetworkAgentInfos that are used to * satisfy requests for that network type. * * This array is built out at startup such that an unsupported network * doesn't get an ArrayList instance, making this a tristate: * unsupported, supported but not active and active. * * The actual lists are populated when we scan the network types that * are supported on this device. * * Threading model: * - addSupportedType() is only called in the constructor * - add(), update(), remove() are only called from the ConnectivityService handler thread. * They are therefore not thread-safe with respect to each other. * - getNetworkForType() can be called at any time on binder threads. It is synchronized * on mTypeLists to be thread-safe with respect to a concurrent remove call. * - dump is thread-safe with respect to concurrent add and remove calls. */ private final ArrayList mTypeLists[]; @NonNull private final ConnectivityService mService; LegacyTypeTracker(@NonNull ConnectivityService service) { mService = service; mTypeLists = new ArrayList[ConnectivityManager.MAX_NETWORK_TYPE + 1]; } public void addSupportedType(int type) { if (mTypeLists[type] != null) { throw new IllegalStateException( "legacy list for type " + type + "already initialized"); } mTypeLists[type] = new ArrayList<>(); } public boolean isTypeSupported(int type) { return isNetworkTypeValid(type) && mTypeLists[type] != null; } public NetworkAgentInfo getNetworkForType(int type) { synchronized (mTypeLists) { if (isTypeSupported(type) && !mTypeLists[type].isEmpty()) { return mTypeLists[type].get(0); } } return null; } private void maybeLogBroadcast(NetworkAgentInfo nai, DetailedState state, int type, boolean isDefaultNetwork) { if (DBG) { log("Sending " + state + " broadcast for type " + type + " " + nai.toShortString() + " isDefaultNetwork=" + isDefaultNetwork); } } /** Adds the given network to the specified legacy type list. */ public void add(int type, NetworkAgentInfo nai) { if (!isTypeSupported(type)) { return; // Invalid network type. } if (VDBG) log("Adding agent " + nai + " for legacy network type " + type); ArrayList list = mTypeLists[type]; if (list.contains(nai)) { return; } synchronized (mTypeLists) { list.add(nai); } // Send a broadcast if this is the first network of its type or if it's the default. final boolean isDefaultNetwork = mService.isDefaultNetwork(nai); if ((list.size() == 1) || isDefaultNetwork) { maybeLogBroadcast(nai, DetailedState.CONNECTED, type, isDefaultNetwork); mService.sendLegacyNetworkBroadcast(nai, DetailedState.CONNECTED, type); } } /** Removes the given network from the specified legacy type list. */ public void remove(int type, NetworkAgentInfo nai, boolean wasDefault) { ArrayList list = mTypeLists[type]; if (list == null || list.isEmpty()) { return; } final boolean wasFirstNetwork = list.get(0).equals(nai); synchronized (mTypeLists) { if (!list.remove(nai)) { return; } } if (wasFirstNetwork || wasDefault) { maybeLogBroadcast(nai, DetailedState.DISCONNECTED, type, wasDefault); mService.sendLegacyNetworkBroadcast(nai, DetailedState.DISCONNECTED, type); } if (!list.isEmpty() && wasFirstNetwork) { if (DBG) log("Other network available for type " + type + ", sending connected broadcast"); final NetworkAgentInfo replacement = list.get(0); maybeLogBroadcast(replacement, DetailedState.CONNECTED, type, mService.isDefaultNetwork(replacement)); mService.sendLegacyNetworkBroadcast(replacement, DetailedState.CONNECTED, type); } } /** Removes the given network from all legacy type lists. */ public void remove(NetworkAgentInfo nai, boolean wasDefault) { if (VDBG) log("Removing agent " + nai + " wasDefault=" + wasDefault); for (int type = 0; type < mTypeLists.length; type++) { remove(type, nai, wasDefault); } } // send out another legacy broadcast - currently only used for suspend/unsuspend // toggle public void update(NetworkAgentInfo nai) { final boolean isDefault = mService.isDefaultNetwork(nai); final DetailedState state = nai.networkInfo.getDetailedState(); for (int type = 0; type < mTypeLists.length; type++) { final ArrayList list = mTypeLists[type]; final boolean contains = (list != null && list.contains(nai)); final boolean isFirst = contains && (nai == list.get(0)); if (isFirst || contains && isDefault) { maybeLogBroadcast(nai, state, type, isDefault); mService.sendLegacyNetworkBroadcast(nai, state, type); } } } public void dump(IndentingPrintWriter pw) { pw.println("mLegacyTypeTracker:"); pw.increaseIndent(); pw.print("Supported types:"); for (int type = 0; type < mTypeLists.length; type++) { if (mTypeLists[type] != null) pw.print(" " + type); } pw.println(); pw.println("Current state:"); pw.increaseIndent(); synchronized (mTypeLists) { for (int type = 0; type < mTypeLists.length; type++) { if (mTypeLists[type] == null || mTypeLists[type].isEmpty()) continue; for (NetworkAgentInfo nai : mTypeLists[type]) { pw.println(type + " " + nai.toShortString()); } } } pw.decreaseIndent(); pw.decreaseIndent(); pw.println(); } } private final LegacyTypeTracker mLegacyTypeTracker = new LegacyTypeTracker(this); /** * Helper class which parses out priority arguments and dumps sections according to their * priority. If priority arguments are omitted, function calls the legacy dump command. */ private final PriorityDump.PriorityDumper mPriorityDumper = new PriorityDump.PriorityDumper() { @Override public void dumpHigh(FileDescriptor fd, PrintWriter pw, String[] args, boolean asProto) { doDump(fd, pw, new String[] {DIAG_ARG}, asProto); doDump(fd, pw, new String[] {SHORT_ARG}, asProto); } @Override public void dumpNormal(FileDescriptor fd, PrintWriter pw, String[] args, boolean asProto) { doDump(fd, pw, args, asProto); } @Override public void dump(FileDescriptor fd, PrintWriter pw, String[] args, boolean asProto) { doDump(fd, pw, args, asProto); } }; /** * Dependencies of ConnectivityService, for injection in tests. */ @VisibleForTesting public static class Dependencies { /** * Get system properties to use in ConnectivityService. */ public MockableSystemProperties getSystemProperties() { return new MockableSystemProperties(); } /** * Create a HandlerThread to use in ConnectivityService. */ public HandlerThread makeHandlerThread() { return new HandlerThread("ConnectivityServiceThread"); } /** * Get a reference to the NetworkStackClient. */ public NetworkStackClient getNetworkStack() { return NetworkStackClient.getInstance(); } /** * @see ProxyTracker */ public ProxyTracker makeProxyTracker(@NonNull Context context, @NonNull Handler connServiceHandler) { return new ProxyTracker(context, connServiceHandler, EVENT_PROXY_HAS_CHANGED); } /** * @see NetIdManager */ public NetIdManager makeNetIdManager() { return new NetIdManager(); } /** * @see NetworkUtils#queryUserAccess(int, int) */ public boolean queryUserAccess(int uid, int netId) { return NetworkUtils.queryUserAccess(uid, netId); } /** * @see MultinetworkPolicyTracker */ public MultinetworkPolicyTracker makeMultinetworkPolicyTracker( @NonNull Context c, @NonNull Handler h, @NonNull Runnable r) { return new MultinetworkPolicyTracker(c, h, r); } /** * @see ServiceManager#checkService(String) */ public boolean hasService(@NonNull String name) { return ServiceManager.checkService(name) != null; } /** * @see IpConnectivityMetrics.Logger */ public IpConnectivityMetrics.Logger getMetricsLogger() { return Objects.requireNonNull(LocalServices.getService(IpConnectivityMetrics.Logger.class), "no IpConnectivityMetrics service"); } /** * @see IpConnectivityMetrics */ public IIpConnectivityMetrics getIpConnectivityMetrics() { return IIpConnectivityMetrics.Stub.asInterface( ServiceManager.getService(IpConnectivityLog.SERVICE_NAME)); } public IBatteryStats getBatteryStatsService() { return BatteryStatsService.getService(); } } public ConnectivityService(Context context, INetworkManagementService netManager, INetworkStatsService statsService, INetworkPolicyManager policyManager) { this(context, netManager, statsService, policyManager, getDnsResolver(), new IpConnectivityLog(), NetdService.getInstance(), new Dependencies()); } @VisibleForTesting protected ConnectivityService(Context context, INetworkManagementService netManager, INetworkStatsService statsService, INetworkPolicyManager policyManager, IDnsResolver dnsresolver, IpConnectivityLog logger, INetd netd, Dependencies deps) { if (DBG) log("ConnectivityService starting up"); mDeps = Objects.requireNonNull(deps, "missing Dependencies"); mSystemProperties = mDeps.getSystemProperties(); mNetIdManager = mDeps.makeNetIdManager(); mContext = Objects.requireNonNull(context, "missing Context"); mMetricsLog = logger; mDefaultRequest = createDefaultInternetRequestForTransport(-1, NetworkRequest.Type.REQUEST); mNetworkRanker = new NetworkRanker(); NetworkRequestInfo defaultNRI = new NetworkRequestInfo(null, mDefaultRequest, new Binder()); mNetworkRequests.put(mDefaultRequest, defaultNRI); mNetworkRequestInfoLogs.log("REGISTER " + defaultNRI); mDefaultMobileDataRequest = createDefaultInternetRequestForTransport( NetworkCapabilities.TRANSPORT_CELLULAR, NetworkRequest.Type.BACKGROUND_REQUEST); // The default WiFi request is a background request so that apps using WiFi are // migrated to a better network (typically ethernet) when one comes up, instead // of staying on WiFi forever. mDefaultWifiRequest = createDefaultInternetRequestForTransport( NetworkCapabilities.TRANSPORT_WIFI, NetworkRequest.Type.BACKGROUND_REQUEST); mHandlerThread = mDeps.makeHandlerThread(); mHandlerThread.start(); mHandler = new InternalHandler(mHandlerThread.getLooper()); mTrackerHandler = new NetworkStateTrackerHandler(mHandlerThread.getLooper()); mConnectivityDiagnosticsHandler = new ConnectivityDiagnosticsHandler(mHandlerThread.getLooper()); mReleasePendingIntentDelayMs = Settings.Secure.getInt(context.getContentResolver(), Settings.Secure.CONNECTIVITY_RELEASE_PENDING_INTENT_DELAY_MS, 5_000); mLingerDelayMs = mSystemProperties.getInt(LINGER_DELAY_PROPERTY, DEFAULT_LINGER_DELAY_MS); mNMS = Objects.requireNonNull(netManager, "missing INetworkManagementService"); mStatsService = Objects.requireNonNull(statsService, "missing INetworkStatsService"); mPolicyManager = Objects.requireNonNull(policyManager, "missing INetworkPolicyManager"); mPolicyManagerInternal = Objects.requireNonNull( LocalServices.getService(NetworkPolicyManagerInternal.class), "missing NetworkPolicyManagerInternal"); mDnsResolver = Objects.requireNonNull(dnsresolver, "missing IDnsResolver"); mProxyTracker = mDeps.makeProxyTracker(mContext, mHandler); mNetd = netd; mKeyStore = KeyStore.getInstance(); mTelephonyManager = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE); mAppOpsManager = (AppOpsManager) mContext.getSystemService(Context.APP_OPS_SERVICE); mLocationPermissionChecker = new LocationPermissionChecker(mContext); // To ensure uid rules are synchronized with Network Policy, register for // NetworkPolicyManagerService events must happen prior to NetworkPolicyManagerService // reading existing policy from disk. try { mPolicyManager.registerListener(mPolicyListener); } catch (RemoteException e) { // ouch, no rules updates means some processes may never get network loge("unable to register INetworkPolicyListener" + e); } final PowerManager powerManager = (PowerManager) context.getSystemService( Context.POWER_SERVICE); mNetTransitionWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG); mNetTransitionWakeLockTimeout = mContext.getResources().getInteger( com.android.internal.R.integer.config_networkTransitionTimeout); mPendingIntentWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG); mNetConfigs = new NetworkConfig[ConnectivityManager.MAX_NETWORK_TYPE+1]; // TODO: What is the "correct" way to do determine if this is a wifi only device? boolean wifiOnly = mSystemProperties.getBoolean("ro.radio.noril", false); log("wifiOnly=" + wifiOnly); String[] naStrings = context.getResources().getStringArray( com.android.internal.R.array.networkAttributes); for (String naString : naStrings) { try { NetworkConfig n = new NetworkConfig(naString); if (VDBG) log("naString=" + naString + " config=" + n); if (n.type > ConnectivityManager.MAX_NETWORK_TYPE) { loge("Error in networkAttributes - ignoring attempt to define type " + n.type); continue; } if (wifiOnly && ConnectivityManager.isNetworkTypeMobile(n.type)) { log("networkAttributes - ignoring mobile as this dev is wifiOnly " + n.type); continue; } if (mNetConfigs[n.type] != null) { loge("Error in networkAttributes - ignoring attempt to redefine type " + n.type); continue; } mLegacyTypeTracker.addSupportedType(n.type); mNetConfigs[n.type] = n; mNetworksDefined++; } catch(Exception e) { // ignore it - leave the entry null } } // Forcibly add TYPE_VPN as a supported type, if it has not already been added via config. if (mNetConfigs[TYPE_VPN] == null) { // mNetConfigs is used only for "restore time", which isn't applicable to VPNs, so we // don't need to add TYPE_VPN to mNetConfigs. mLegacyTypeTracker.addSupportedType(TYPE_VPN); mNetworksDefined++; // used only in the log() statement below. } // Do the same for Ethernet, since it's often not specified in the configs, although many // devices can use it via USB host adapters. if (mNetConfigs[TYPE_ETHERNET] == null && mDeps.hasService(Context.ETHERNET_SERVICE)) { mLegacyTypeTracker.addSupportedType(TYPE_ETHERNET); mNetworksDefined++; } if (VDBG) log("mNetworksDefined=" + mNetworksDefined); mProtectedNetworks = new ArrayList(); int[] protectedNetworks = context.getResources().getIntArray( com.android.internal.R.array.config_protectedNetworks); for (int p : protectedNetworks) { if ((mNetConfigs[p] != null) && (mProtectedNetworks.contains(p) == false)) { mProtectedNetworks.add(p); } else { if (DBG) loge("Ignoring protectedNetwork " + p); } } mWolSupportedInterfaces = new ArraySet( mContext.getResources().getStringArray( com.android.internal.R.array.config_wakeonlan_supported_interfaces)); mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE); mPermissionMonitor = new PermissionMonitor(mContext, mNetd); // Set up the listener for user state for creating user VPNs. // Should run on mHandler to avoid any races. IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(Intent.ACTION_USER_STARTED); intentFilter.addAction(Intent.ACTION_USER_STOPPED); intentFilter.addAction(Intent.ACTION_USER_ADDED); intentFilter.addAction(Intent.ACTION_USER_REMOVED); intentFilter.addAction(Intent.ACTION_USER_UNLOCKED); mContext.registerReceiverAsUser( mIntentReceiver, UserHandle.ALL, intentFilter, null /* broadcastPermission */, mHandler); mContext.registerReceiverAsUser(mUserPresentReceiver, UserHandle.SYSTEM, new IntentFilter(Intent.ACTION_USER_PRESENT), null, null); // Listen to package add and removal events for all users. intentFilter = new IntentFilter(); intentFilter.addAction(Intent.ACTION_PACKAGE_ADDED); intentFilter.addAction(Intent.ACTION_PACKAGE_REPLACED); intentFilter.addAction(Intent.ACTION_PACKAGE_REMOVED); intentFilter.addDataScheme("package"); mContext.registerReceiverAsUser( mIntentReceiver, UserHandle.ALL, intentFilter, null /* broadcastPermission */, mHandler); try { mNMS.registerObserver(mDataActivityObserver); } catch (RemoteException e) { loge("Error registering observer :" + e); } mSettingsObserver = new SettingsObserver(mContext, mHandler); registerSettingsCallbacks(); final DataConnectionStats dataConnectionStats = new DataConnectionStats(mContext, mHandler); dataConnectionStats.startMonitoring(); mKeepaliveTracker = new KeepaliveTracker(mContext, mHandler); mNotifier = new NetworkNotificationManager(mContext, mTelephonyManager, mContext.getSystemService(NotificationManager.class)); final int dailyLimit = Settings.Global.getInt(mContext.getContentResolver(), Settings.Global.NETWORK_SWITCH_NOTIFICATION_DAILY_LIMIT, LingerMonitor.DEFAULT_NOTIFICATION_DAILY_LIMIT); final long rateLimit = Settings.Global.getLong(mContext.getContentResolver(), Settings.Global.NETWORK_SWITCH_NOTIFICATION_RATE_LIMIT_MILLIS, LingerMonitor.DEFAULT_NOTIFICATION_RATE_LIMIT_MILLIS); mLingerMonitor = new LingerMonitor(mContext, mNotifier, dailyLimit, rateLimit); mMultinetworkPolicyTracker = mDeps.makeMultinetworkPolicyTracker( mContext, mHandler, () -> rematchForAvoidBadWifiUpdate()); mMultinetworkPolicyTracker.start(); mMultipathPolicyTracker = new MultipathPolicyTracker(mContext, mHandler); mDnsManager = new DnsManager(mContext, mDnsResolver, mSystemProperties); registerPrivateDnsSettingsCallbacks(); } private static NetworkCapabilities createDefaultNetworkCapabilitiesForUid(int uid) { final NetworkCapabilities netCap = new NetworkCapabilities(); netCap.addCapability(NET_CAPABILITY_INTERNET); netCap.removeCapability(NET_CAPABILITY_NOT_VPN); netCap.setSingleUid(uid); return netCap; } private NetworkRequest createDefaultInternetRequestForTransport( int transportType, NetworkRequest.Type type) { final NetworkCapabilities netCap = new NetworkCapabilities(); netCap.addCapability(NET_CAPABILITY_INTERNET); netCap.setRequestorUidAndPackageName(Process.myUid(), mContext.getPackageName()); if (transportType > -1) { netCap.addTransportType(transportType); } return new NetworkRequest(netCap, TYPE_NONE, nextNetworkRequestId(), type); } // Used only for testing. // TODO: Delete this and either: // 1. Give FakeSettingsProvider the ability to send settings change notifications (requires // changing ContentResolver to make registerContentObserver non-final). // 2. Give FakeSettingsProvider an alternative notification mechanism and have the test use it // by subclassing SettingsObserver. @VisibleForTesting void updateAlwaysOnNetworks() { mHandler.sendEmptyMessage(EVENT_CONFIGURE_ALWAYS_ON_NETWORKS); } // See FakeSettingsProvider comment above. @VisibleForTesting void updatePrivateDnsSettings() { mHandler.sendEmptyMessage(EVENT_PRIVATE_DNS_SETTINGS_CHANGED); } private void handleAlwaysOnNetworkRequest( NetworkRequest networkRequest, String settingName, boolean defaultValue) { final boolean enable = toBool(Settings.Global.getInt( mContext.getContentResolver(), settingName, encodeBool(defaultValue))); final boolean isEnabled = (mNetworkRequests.get(networkRequest) != null); if (enable == isEnabled) { return; // Nothing to do. } if (enable) { handleRegisterNetworkRequest(new NetworkRequestInfo( null, networkRequest, new Binder())); } else { handleReleaseNetworkRequest(networkRequest, Process.SYSTEM_UID, /* callOnUnavailable */ false); } } private void handleConfigureAlwaysOnNetworks() { handleAlwaysOnNetworkRequest( mDefaultMobileDataRequest,Settings.Global.MOBILE_DATA_ALWAYS_ON, true); handleAlwaysOnNetworkRequest(mDefaultWifiRequest, Settings.Global.WIFI_ALWAYS_REQUESTED, false); } private void registerSettingsCallbacks() { // Watch for global HTTP proxy changes. mSettingsObserver.observe( Settings.Global.getUriFor(Settings.Global.HTTP_PROXY), EVENT_APPLY_GLOBAL_HTTP_PROXY); // Watch for whether or not to keep mobile data always on. mSettingsObserver.observe( Settings.Global.getUriFor(Settings.Global.MOBILE_DATA_ALWAYS_ON), EVENT_CONFIGURE_ALWAYS_ON_NETWORKS); // Watch for whether or not to keep wifi always on. mSettingsObserver.observe( Settings.Global.getUriFor(Settings.Global.WIFI_ALWAYS_REQUESTED), EVENT_CONFIGURE_ALWAYS_ON_NETWORKS); } private void registerPrivateDnsSettingsCallbacks() { for (Uri uri : DnsManager.getPrivateDnsSettingsUris()) { mSettingsObserver.observe(uri, EVENT_PRIVATE_DNS_SETTINGS_CHANGED); } } private synchronized int nextNetworkRequestId() { return mNextNetworkRequestId++; } private NetworkState getFilteredNetworkState(int networkType, int uid) { if (mLegacyTypeTracker.isTypeSupported(networkType)) { final NetworkAgentInfo nai = mLegacyTypeTracker.getNetworkForType(networkType); final NetworkState state; if (nai != null) { state = nai.getNetworkState(); state.networkInfo.setType(networkType); } else { final NetworkInfo info = new NetworkInfo(networkType, 0, getNetworkTypeName(networkType), ""); info.setDetailedState(NetworkInfo.DetailedState.DISCONNECTED, null, null); info.setIsAvailable(true); final NetworkCapabilities capabilities = new NetworkCapabilities(); capabilities.setCapability(NetworkCapabilities.NET_CAPABILITY_NOT_ROAMING, !info.isRoaming()); state = new NetworkState(info, new LinkProperties(), capabilities, null, null, null); } filterNetworkStateForUid(state, uid, false); return state; } else { return NetworkState.EMPTY; } } @VisibleForTesting protected NetworkAgentInfo getNetworkAgentInfoForNetwork(Network network) { if (network == null) { return null; } return getNetworkAgentInfoForNetId(network.netId); } private NetworkAgentInfo getNetworkAgentInfoForNetId(int netId) { synchronized (mNetworkForNetId) { return mNetworkForNetId.get(netId); } } private Network[] getVpnUnderlyingNetworks(int uid) { synchronized (mVpns) { if (!mLockdownEnabled) { int user = UserHandle.getUserId(uid); Vpn vpn = mVpns.get(user); if (vpn != null && vpn.appliesToUid(uid)) { return vpn.getUnderlyingNetworks(); } } } return null; } private NetworkState getUnfilteredActiveNetworkState(int uid) { NetworkAgentInfo nai = getDefaultNetwork(); final Network[] networks = getVpnUnderlyingNetworks(uid); if (networks != null) { // getUnderlyingNetworks() returns: // null => there was no VPN, or the VPN didn't specify anything, so we use the default. // empty array => the VPN explicitly said "no default network". // non-empty array => the VPN specified one or more default networks; we use the // first one. if (networks.length > 0) { nai = getNetworkAgentInfoForNetwork(networks[0]); } else { nai = null; } } if (nai != null) { return nai.getNetworkState(); } else { return NetworkState.EMPTY; } } /** * Check if UID should be blocked from using the network with the given LinkProperties. */ private boolean isNetworkWithLinkPropertiesBlocked(LinkProperties lp, int uid, boolean ignoreBlocked) { // Networks aren't blocked when ignoring blocked status if (ignoreBlocked) { return false; } synchronized (mVpns) { final Vpn vpn = mVpns.get(UserHandle.getUserId(uid)); if (vpn != null && vpn.getLockdown() && vpn.isBlockingUid(uid)) { return true; } } final String iface = (lp == null ? "" : lp.getInterfaceName()); return mPolicyManagerInternal.isUidNetworkingBlocked(uid, iface); } private void maybeLogBlockedNetworkInfo(NetworkInfo ni, int uid) { if (ni == null || !LOGD_BLOCKED_NETWORKINFO) { return; } final boolean blocked; synchronized (mBlockedAppUids) { if (ni.getDetailedState() == DetailedState.BLOCKED && mBlockedAppUids.add(uid)) { blocked = true; } else if (ni.isConnected() && mBlockedAppUids.remove(uid)) { blocked = false; } else { return; } } String action = blocked ? "BLOCKED" : "UNBLOCKED"; log(String.format("Returning %s NetworkInfo to uid=%d", action, uid)); mNetworkInfoBlockingLogs.log(action + " " + uid); } private void maybeLogBlockedStatusChanged(NetworkRequestInfo nri, Network net, boolean blocked) { if (nri == null || net == null || !LOGD_BLOCKED_NETWORKINFO) { return; } final String action = blocked ? "BLOCKED" : "UNBLOCKED"; mNetworkInfoBlockingLogs.log(String.format( "%s %d(%d) on netId %d", action, nri.mUid, nri.request.requestId, net.netId)); } /** * Apply any relevant filters to {@link NetworkState} for the given UID. For * example, this may mark the network as {@link DetailedState#BLOCKED} based * on {@link #isNetworkWithLinkPropertiesBlocked}. */ private void filterNetworkStateForUid(NetworkState state, int uid, boolean ignoreBlocked) { if (state == null || state.networkInfo == null || state.linkProperties == null) return; if (isNetworkWithLinkPropertiesBlocked(state.linkProperties, uid, ignoreBlocked)) { state.networkInfo.setDetailedState(DetailedState.BLOCKED, null, null); } synchronized (mVpns) { if (mLockdownTracker != null) { mLockdownTracker.augmentNetworkInfo(state.networkInfo); } } } /** * Return NetworkInfo for the active (i.e., connected) network interface. * It is assumed that at most one network is active at a time. If more * than one is active, it is indeterminate which will be returned. * @return the info for the active network, or {@code null} if none is * active */ @Override public NetworkInfo getActiveNetworkInfo() { enforceAccessPermission(); final int uid = Binder.getCallingUid(); final NetworkState state = getUnfilteredActiveNetworkState(uid); filterNetworkStateForUid(state, uid, false); maybeLogBlockedNetworkInfo(state.networkInfo, uid); return state.networkInfo; } @Override public Network getActiveNetwork() { enforceAccessPermission(); return getActiveNetworkForUidInternal(Binder.getCallingUid(), false); } @Override public Network getActiveNetworkForUid(int uid, boolean ignoreBlocked) { NetworkStack.checkNetworkStackPermission(mContext); return getActiveNetworkForUidInternal(uid, ignoreBlocked); } private Network getActiveNetworkForUidInternal(final int uid, boolean ignoreBlocked) { final int user = UserHandle.getUserId(uid); int vpnNetId = NETID_UNSET; synchronized (mVpns) { final Vpn vpn = mVpns.get(user); // TODO : now that capabilities contain the UID, the appliesToUid test should // be removed as the satisfying test below should be enough. if (vpn != null && vpn.appliesToUid(uid)) vpnNetId = vpn.getNetId(); } NetworkAgentInfo nai; if (vpnNetId != NETID_UNSET) { nai = getNetworkAgentInfoForNetId(vpnNetId); if (nai != null) { final NetworkCapabilities requiredCaps = createDefaultNetworkCapabilitiesForUid(uid); if (requiredCaps.satisfiedByNetworkCapabilities(nai.networkCapabilities)) { return nai.network; } } } nai = getDefaultNetwork(); if (nai != null && isNetworkWithLinkPropertiesBlocked(nai.linkProperties, uid, ignoreBlocked)) { nai = null; } return nai != null ? nai.network : null; } // Public because it's used by mLockdownTracker. public NetworkInfo getActiveNetworkInfoUnfiltered() { enforceAccessPermission(); final int uid = Binder.getCallingUid(); NetworkState state = getUnfilteredActiveNetworkState(uid); return state.networkInfo; } @Override public NetworkInfo getActiveNetworkInfoForUid(int uid, boolean ignoreBlocked) { NetworkStack.checkNetworkStackPermission(mContext); final NetworkState state = getUnfilteredActiveNetworkState(uid); filterNetworkStateForUid(state, uid, ignoreBlocked); return state.networkInfo; } @Override public NetworkInfo getNetworkInfo(int networkType) { enforceAccessPermission(); final int uid = Binder.getCallingUid(); if (getVpnUnderlyingNetworks(uid) != null) { // A VPN is active, so we may need to return one of its underlying networks. This // information is not available in LegacyTypeTracker, so we have to get it from // getUnfilteredActiveNetworkState. final NetworkState state = getUnfilteredActiveNetworkState(uid); if (state.networkInfo != null && state.networkInfo.getType() == networkType) { filterNetworkStateForUid(state, uid, false); return state.networkInfo; } } final NetworkState state = getFilteredNetworkState(networkType, uid); return state.networkInfo; } @Override public NetworkInfo getNetworkInfoForUid(Network network, int uid, boolean ignoreBlocked) { enforceAccessPermission(); final NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network); if (nai != null) { final NetworkState state = nai.getNetworkState(); filterNetworkStateForUid(state, uid, ignoreBlocked); return state.networkInfo; } else { return null; } } @Override public NetworkInfo[] getAllNetworkInfo() { enforceAccessPermission(); final ArrayList result = Lists.newArrayList(); for (int networkType = 0; networkType <= ConnectivityManager.MAX_NETWORK_TYPE; networkType++) { NetworkInfo info = getNetworkInfo(networkType); if (info != null) { result.add(info); } } return result.toArray(new NetworkInfo[result.size()]); } @Override public Network getNetworkForType(int networkType) { enforceAccessPermission(); final int uid = Binder.getCallingUid(); NetworkState state = getFilteredNetworkState(networkType, uid); if (!isNetworkWithLinkPropertiesBlocked(state.linkProperties, uid, false)) { return state.network; } return null; } @Override public Network[] getAllNetworks() { enforceAccessPermission(); synchronized (mNetworkForNetId) { final Network[] result = new Network[mNetworkForNetId.size()]; for (int i = 0; i < mNetworkForNetId.size(); i++) { result[i] = mNetworkForNetId.valueAt(i).network; } return result; } } @Override public NetworkCapabilities[] getDefaultNetworkCapabilitiesForUser( int userId, String callingPackageName) { // The basic principle is: if an app's traffic could possibly go over a // network, without the app doing anything multinetwork-specific, // (hence, by "default"), then include that network's capabilities in // the array. // // In the normal case, app traffic only goes over the system's default // network connection, so that's the only network returned. // // With a VPN in force, some app traffic may go into the VPN, and thus // over whatever underlying networks the VPN specifies, while other app // traffic may go over the system default network (e.g.: a split-tunnel // VPN, or an app disallowed by the VPN), so the set of networks // returned includes the VPN's underlying networks and the system // default. enforceAccessPermission(); HashMap result = new HashMap<>(); NetworkAgentInfo nai = getDefaultNetwork(); NetworkCapabilities nc = getNetworkCapabilitiesInternal(nai); if (nc != null) { result.put( nai.network, maybeSanitizeLocationInfoForCaller( nc, Binder.getCallingUid(), callingPackageName)); } synchronized (mVpns) { if (!mLockdownEnabled) { Vpn vpn = mVpns.get(userId); if (vpn != null) { Network[] networks = vpn.getUnderlyingNetworks(); if (networks != null) { for (Network network : networks) { nc = getNetworkCapabilitiesInternal(network); if (nc != null) { result.put( network, maybeSanitizeLocationInfoForCaller( nc, Binder.getCallingUid(), callingPackageName)); } } } } } } NetworkCapabilities[] out = new NetworkCapabilities[result.size()]; out = result.values().toArray(out); return out; } @Override public boolean isNetworkSupported(int networkType) { enforceAccessPermission(); return mLegacyTypeTracker.isTypeSupported(networkType); } /** * Return LinkProperties for the active (i.e., connected) default * network interface. It is assumed that at most one default network * is active at a time. If more than one is active, it is indeterminate * which will be returned. * @return the ip properties for the active network, or {@code null} if * none is active */ @Override public LinkProperties getActiveLinkProperties() { enforceAccessPermission(); final int uid = Binder.getCallingUid(); NetworkState state = getUnfilteredActiveNetworkState(uid); if (state.linkProperties == null) return null; return linkPropertiesRestrictedForCallerPermissions(state.linkProperties, Binder.getCallingPid(), uid); } @Override public LinkProperties getLinkPropertiesForType(int networkType) { enforceAccessPermission(); NetworkAgentInfo nai = mLegacyTypeTracker.getNetworkForType(networkType); final LinkProperties lp = getLinkProperties(nai); if (lp == null) return null; return linkPropertiesRestrictedForCallerPermissions( lp, Binder.getCallingPid(), Binder.getCallingUid()); } // TODO - this should be ALL networks @Override public LinkProperties getLinkProperties(Network network) { enforceAccessPermission(); final LinkProperties lp = getLinkProperties(getNetworkAgentInfoForNetwork(network)); if (lp == null) return null; return linkPropertiesRestrictedForCallerPermissions( lp, Binder.getCallingPid(), Binder.getCallingUid()); } @Nullable private LinkProperties getLinkProperties(@Nullable NetworkAgentInfo nai) { if (nai == null) { return null; } synchronized (nai) { return nai.linkProperties; } } private NetworkCapabilities getNetworkCapabilitiesInternal(Network network) { return getNetworkCapabilitiesInternal(getNetworkAgentInfoForNetwork(network)); } private NetworkCapabilities getNetworkCapabilitiesInternal(NetworkAgentInfo nai) { if (nai == null) return null; synchronized (nai) { if (nai.networkCapabilities == null) return null; return networkCapabilitiesRestrictedForCallerPermissions( nai.networkCapabilities, Binder.getCallingPid(), Binder.getCallingUid()); } } @Override public NetworkCapabilities getNetworkCapabilities(Network network, String callingPackageName) { mAppOpsManager.checkPackage(Binder.getCallingUid(), callingPackageName); enforceAccessPermission(); return maybeSanitizeLocationInfoForCaller( getNetworkCapabilitiesInternal(network), Binder.getCallingUid(), callingPackageName); } @VisibleForTesting NetworkCapabilities networkCapabilitiesRestrictedForCallerPermissions( NetworkCapabilities nc, int callerPid, int callerUid) { final NetworkCapabilities newNc = new NetworkCapabilities(nc); if (!checkSettingsPermission(callerPid, callerUid)) { newNc.setUids(null); newNc.setSSID(null); } if (newNc.getNetworkSpecifier() != null) { newNc.setNetworkSpecifier(newNc.getNetworkSpecifier().redact()); } newNc.setAdministratorUids(new int[0]); return newNc; } @VisibleForTesting @Nullable NetworkCapabilities maybeSanitizeLocationInfoForCaller( @Nullable NetworkCapabilities nc, int callerUid, @NonNull String callerPkgName) { if (nc == null) { return null; } final NetworkCapabilities newNc = new NetworkCapabilities(nc); if (callerUid != newNc.getOwnerUid()) { newNc.setOwnerUid(INVALID_UID); return newNc; } // Allow VPNs to see ownership of their own VPN networks - not location sensitive. if (nc.hasTransport(TRANSPORT_VPN)) { // Owner UIDs already checked above. No need to re-check. return newNc; } Binder.withCleanCallingIdentity( () -> { if (!mLocationPermissionChecker.checkLocationPermission( callerPkgName, null /* featureId */, callerUid, null /* message */)) { // Caller does not have the requisite location permissions. Reset the // owner's UID in the NetworkCapabilities. newNc.setOwnerUid(INVALID_UID); } } ); return newNc; } private LinkProperties linkPropertiesRestrictedForCallerPermissions( LinkProperties lp, int callerPid, int callerUid) { if (lp == null) return new LinkProperties(); // Only do a permission check if sanitization is needed, to avoid unnecessary binder calls. final boolean needsSanitization = (lp.getCaptivePortalApiUrl() != null || lp.getCaptivePortalData() != null); if (!needsSanitization) { return new LinkProperties(lp); } if (checkSettingsPermission(callerPid, callerUid)) { return new LinkProperties(lp, true /* parcelSensitiveFields */); } final LinkProperties newLp = new LinkProperties(lp); // Sensitive fields would not be parceled anyway, but sanitize for consistency before the // object gets parceled. newLp.setCaptivePortalApiUrl(null); newLp.setCaptivePortalData(null); return newLp; } private void restrictRequestUidsForCallerAndSetRequestorInfo(NetworkCapabilities nc, int callerUid, String callerPackageName) { if (!checkSettingsPermission()) { nc.setSingleUid(callerUid); } nc.setRequestorUidAndPackageName(callerUid, callerPackageName); nc.setAdministratorUids(new int[0]); // Clear owner UID; this can never come from an app. nc.setOwnerUid(INVALID_UID); } private void restrictBackgroundRequestForCaller(NetworkCapabilities nc) { if (!mPermissionMonitor.hasUseBackgroundNetworksPermission(Binder.getCallingUid())) { nc.addCapability(NET_CAPABILITY_FOREGROUND); } } @Override public NetworkState[] getAllNetworkState() { // This contains IMSI details, so make sure the caller is privileged. NetworkStack.checkNetworkStackPermission(mContext); final ArrayList result = Lists.newArrayList(); for (Network network : getAllNetworks()) { final NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network); if (nai != null) { // TODO (b/73321673) : NetworkState contains a copy of the // NetworkCapabilities, which may contain UIDs of apps to which the // network applies. Should the UIDs be cleared so as not to leak or // interfere ? result.add(nai.getNetworkState()); } } return result.toArray(new NetworkState[result.size()]); } @Override @Deprecated public NetworkQuotaInfo getActiveNetworkQuotaInfo() { Log.w(TAG, "Shame on UID " + Binder.getCallingUid() + " for calling the hidden API getNetworkQuotaInfo(). Shame!"); return new NetworkQuotaInfo(); } @Override public boolean isActiveNetworkMetered() { enforceAccessPermission(); final NetworkCapabilities caps = getNetworkCapabilitiesInternal(getActiveNetwork()); if (caps != null) { return !caps.hasCapability(NetworkCapabilities.NET_CAPABILITY_NOT_METERED); } else { // Always return the most conservative value return true; } } private INetworkManagementEventObserver mDataActivityObserver = new BaseNetworkObserver() { @Override public void interfaceClassDataActivityChanged(String label, boolean active, long tsNanos) { int deviceType = Integer.parseInt(label); sendDataActivityBroadcast(deviceType, active, tsNanos); } }; /** * Ensures that the system cannot call a particular method. */ private boolean disallowedBecauseSystemCaller() { // TODO: start throwing a SecurityException when GnssLocationProvider stops calling // requestRouteToHost. In Q, GnssLocationProvider is changed to not call requestRouteToHost // for devices launched with Q and above. However, existing devices upgrading to Q and // above must continued to be supported for few more releases. if (isSystem(Binder.getCallingUid()) && SystemProperties.getInt( "ro.product.first_api_level", 0) > Build.VERSION_CODES.P) { log("This method exists only for app backwards compatibility" + " and must not be called by system services."); return true; } return false; } /** * Ensure that a network route exists to deliver traffic to the specified * host via the specified network interface. * @param networkType the type of the network over which traffic to the * specified host is to be routed * @param hostAddress the IP address of the host to which the route is * desired * @return {@code true} on success, {@code false} on failure */ @Override public boolean requestRouteToHostAddress(int networkType, byte[] hostAddress) { if (disallowedBecauseSystemCaller()) { return false; } enforceChangePermission(); if (mProtectedNetworks.contains(networkType)) { enforceConnectivityRestrictedNetworksPermission(); } InetAddress addr; try { addr = InetAddress.getByAddress(hostAddress); } catch (UnknownHostException e) { if (DBG) log("requestRouteToHostAddress got " + e.toString()); return false; } if (!ConnectivityManager.isNetworkTypeValid(networkType)) { if (DBG) log("requestRouteToHostAddress on invalid network: " + networkType); return false; } NetworkAgentInfo nai = mLegacyTypeTracker.getNetworkForType(networkType); if (nai == null) { if (mLegacyTypeTracker.isTypeSupported(networkType) == false) { if (DBG) log("requestRouteToHostAddress on unsupported network: " + networkType); } else { if (DBG) log("requestRouteToHostAddress on down network: " + networkType); } return false; } DetailedState netState; synchronized (nai) { netState = nai.networkInfo.getDetailedState(); } if (netState != DetailedState.CONNECTED && netState != DetailedState.CAPTIVE_PORTAL_CHECK) { if (VDBG) { log("requestRouteToHostAddress on down network " + "(" + networkType + ") - dropped" + " netState=" + netState); } return false; } final int uid = Binder.getCallingUid(); final long token = Binder.clearCallingIdentity(); try { LinkProperties lp; int netId; synchronized (nai) { lp = nai.linkProperties; netId = nai.network.netId; } boolean ok = addLegacyRouteToHost(lp, addr, netId, uid); if (DBG) log("requestRouteToHostAddress ok=" + ok); return ok; } finally { Binder.restoreCallingIdentity(token); } } private boolean addLegacyRouteToHost(LinkProperties lp, InetAddress addr, int netId, int uid) { RouteInfo bestRoute = RouteInfo.selectBestRoute(lp.getAllRoutes(), addr); if (bestRoute == null) { bestRoute = RouteInfo.makeHostRoute(addr, lp.getInterfaceName()); } else { String iface = bestRoute.getInterface(); if (bestRoute.getGateway().equals(addr)) { // if there is no better route, add the implied hostroute for our gateway bestRoute = RouteInfo.makeHostRoute(addr, iface); } else { // if we will connect to this through another route, add a direct route // to it's gateway bestRoute = RouteInfo.makeHostRoute(addr, bestRoute.getGateway(), iface); } } if (DBG) log("Adding legacy route " + bestRoute + " for UID/PID " + uid + "/" + Binder.getCallingPid()); try { mNMS.addLegacyRouteForNetId(netId, bestRoute, uid); } catch (Exception e) { // never crash - catch them all if (DBG) loge("Exception trying to add a route: " + e); return false; } return true; } @VisibleForTesting protected final INetdEventCallback mNetdEventCallback = new BaseNetdEventCallback() { @Override public void onPrivateDnsValidationEvent(int netId, String ipAddress, String hostname, boolean validated) { try { mHandler.sendMessage(mHandler.obtainMessage( EVENT_PRIVATE_DNS_VALIDATION_UPDATE, new PrivateDnsValidationUpdate(netId, InetAddress.parseNumericAddress(ipAddress), hostname, validated))); } catch (IllegalArgumentException e) { loge("Error parsing ip address in validation event"); } } @Override public void onDnsEvent(int netId, int eventType, int returnCode, String hostname, String[] ipAddresses, int ipAddressesCount, long timestamp, int uid) { NetworkAgentInfo nai = getNetworkAgentInfoForNetId(netId); // Netd event only allow registrants from system. Each NetworkMonitor thread is under // the caller thread of registerNetworkAgent. Thus, it's not allowed to register netd // event callback for certain nai. e.g. cellular. Register here to pass to // NetworkMonitor instead. // TODO: Move the Dns Event to NetworkMonitor. NetdEventListenerService only allow one // callback from each caller type. Need to re-factor NetdEventListenerService to allow // multiple NetworkMonitor registrants. if (nai != null && nai.satisfies(mDefaultRequest)) { nai.networkMonitor().notifyDnsResponse(returnCode); } } @Override public void onNat64PrefixEvent(int netId, boolean added, String prefixString, int prefixLength) { mHandler.post(() -> handleNat64PrefixEvent(netId, added, prefixString, prefixLength)); } }; private void registerNetdEventCallback() { final IIpConnectivityMetrics ipConnectivityMetrics = mDeps.getIpConnectivityMetrics(); if (ipConnectivityMetrics == null) { Slog.wtf(TAG, "Missing IIpConnectivityMetrics"); return; } try { ipConnectivityMetrics.addNetdEventCallback( INetdEventCallback.CALLBACK_CALLER_CONNECTIVITY_SERVICE, mNetdEventCallback); } catch (Exception e) { loge("Error registering netd callback: " + e); } } private final INetworkPolicyListener mPolicyListener = new NetworkPolicyManager.Listener() { @Override public void onUidRulesChanged(int uid, int uidRules) { mHandler.sendMessage(mHandler.obtainMessage(EVENT_UID_RULES_CHANGED, uid, uidRules)); } @Override public void onRestrictBackgroundChanged(boolean restrictBackground) { // caller is NPMS, since we only register with them if (LOGD_BLOCKED_NETWORKINFO) { log("onRestrictBackgroundChanged(restrictBackground=" + restrictBackground + ")"); } mHandler.sendMessage(mHandler.obtainMessage( EVENT_DATA_SAVER_CHANGED, restrictBackground ? 1 : 0, 0)); } }; void handleUidRulesChanged(int uid, int newRules) { // skip update when we've already applied rules final int oldRules = mUidRules.get(uid, RULE_NONE); if (oldRules == newRules) return; maybeNotifyNetworkBlockedForNewUidRules(uid, newRules); if (newRules == RULE_NONE) { mUidRules.delete(uid); } else { mUidRules.put(uid, newRules); } } void handleRestrictBackgroundChanged(boolean restrictBackground) { if (mRestrictBackground == restrictBackground) return; for (final NetworkAgentInfo nai : mNetworkAgentInfos.values()) { final boolean curMetered = nai.networkCapabilities.isMetered(); maybeNotifyNetworkBlocked(nai, curMetered, curMetered, mRestrictBackground, restrictBackground); } mRestrictBackground = restrictBackground; } private boolean isUidNetworkingWithVpnBlocked(int uid, int uidRules, boolean isNetworkMetered, boolean isBackgroundRestricted) { synchronized (mVpns) { final Vpn vpn = mVpns.get(UserHandle.getUserId(uid)); // Because the return value of this function depends on the list of UIDs the // always-on VPN blocks when in lockdown mode, when the always-on VPN changes that // list all state depending on the return value of this function has to be recomputed. // TODO: add a trigger when the always-on VPN sets its blocked UIDs to reevaluate and // send the necessary onBlockedStatusChanged callbacks. if (vpn != null && vpn.getLockdown() && vpn.isBlockingUid(uid)) { return true; } } return NetworkPolicyManagerInternal.isUidNetworkingBlocked(uid, uidRules, isNetworkMetered, isBackgroundRestricted); } /** * Require that the caller is either in the same user or has appropriate permission to interact * across users. * * @param userId Target user for whatever operation the current IPC is supposed to perform. */ private void enforceCrossUserPermission(int userId) { if (userId == UserHandle.getCallingUserId()) { // Not a cross-user call. return; } mContext.enforceCallingOrSelfPermission( android.Manifest.permission.INTERACT_ACROSS_USERS_FULL, "ConnectivityService"); } private boolean checkAnyPermissionOf(String... permissions) { for (String permission : permissions) { if (mContext.checkCallingOrSelfPermission(permission) == PERMISSION_GRANTED) { return true; } } return false; } private boolean checkAnyPermissionOf(int pid, int uid, String... permissions) { for (String permission : permissions) { if (mContext.checkPermission(permission, pid, uid) == PERMISSION_GRANTED) { return true; } } return false; } private void enforceAnyPermissionOf(String... permissions) { if (!checkAnyPermissionOf(permissions)) { throw new SecurityException("Requires one of the following permissions: " + String.join(", ", permissions) + "."); } } private void enforceInternetPermission() { mContext.enforceCallingOrSelfPermission( android.Manifest.permission.INTERNET, "ConnectivityService"); } private void enforceAccessPermission() { mContext.enforceCallingOrSelfPermission( android.Manifest.permission.ACCESS_NETWORK_STATE, "ConnectivityService"); } private void enforceChangePermission() { ConnectivityManager.enforceChangePermission(mContext); } private void enforceSettingsPermission() { enforceAnyPermissionOf( android.Manifest.permission.NETWORK_SETTINGS, NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK); } private void enforceNetworkFactoryPermission() { enforceAnyPermissionOf( android.Manifest.permission.NETWORK_FACTORY, NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK); } private void enforceNetworkFactoryOrSettingsPermission() { enforceAnyPermissionOf( android.Manifest.permission.NETWORK_SETTINGS, android.Manifest.permission.NETWORK_FACTORY, NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK); } private void enforceNetworkFactoryOrTestNetworksPermission() { enforceAnyPermissionOf( android.Manifest.permission.MANAGE_TEST_NETWORKS, android.Manifest.permission.NETWORK_FACTORY, NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK); } private boolean checkSettingsPermission() { return checkAnyPermissionOf( android.Manifest.permission.NETWORK_SETTINGS, NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK); } private boolean checkSettingsPermission(int pid, int uid) { return PERMISSION_GRANTED == mContext.checkPermission( android.Manifest.permission.NETWORK_SETTINGS, pid, uid) || PERMISSION_GRANTED == mContext.checkPermission( NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK, pid, uid); } private void enforceControlAlwaysOnVpnPermission() { mContext.enforceCallingOrSelfPermission( android.Manifest.permission.CONTROL_ALWAYS_ON_VPN, "ConnectivityService"); } private void enforceNetworkStackOrSettingsPermission() { enforceAnyPermissionOf( android.Manifest.permission.NETWORK_SETTINGS, android.Manifest.permission.NETWORK_STACK, NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK); } private void enforceNetworkStackSettingsOrSetup() { enforceAnyPermissionOf( android.Manifest.permission.NETWORK_SETTINGS, android.Manifest.permission.NETWORK_SETUP_WIZARD, android.Manifest.permission.NETWORK_STACK, NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK); } private void enforceAirplaneModePermission() { enforceAnyPermissionOf( android.Manifest.permission.NETWORK_AIRPLANE_MODE, android.Manifest.permission.NETWORK_SETTINGS, android.Manifest.permission.NETWORK_SETUP_WIZARD, android.Manifest.permission.NETWORK_STACK, NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK); } private boolean checkNetworkStackPermission() { return checkAnyPermissionOf( android.Manifest.permission.NETWORK_STACK, NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK); } private boolean checkNetworkStackPermission(int pid, int uid) { return checkAnyPermissionOf(pid, uid, android.Manifest.permission.NETWORK_STACK, NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK); } private boolean checkNetworkSignalStrengthWakeupPermission(int pid, int uid) { return checkAnyPermissionOf(pid, uid, android.Manifest.permission.NETWORK_SIGNAL_STRENGTH_WAKEUP, NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK, android.Manifest.permission.NETWORK_SETTINGS); } private void enforceConnectivityRestrictedNetworksPermission() { try { mContext.enforceCallingOrSelfPermission( android.Manifest.permission.CONNECTIVITY_USE_RESTRICTED_NETWORKS, "ConnectivityService"); return; } catch (SecurityException e) { /* fallback to ConnectivityInternalPermission */ } // TODO: Remove this fallback check after all apps have declared // CONNECTIVITY_USE_RESTRICTED_NETWORKS. mContext.enforceCallingOrSelfPermission( android.Manifest.permission.CONNECTIVITY_INTERNAL, "ConnectivityService"); } private void enforceKeepalivePermission() { mContext.enforceCallingOrSelfPermission(KeepaliveTracker.PERMISSION, "ConnectivityService"); } // Public because it's used by mLockdownTracker. public void sendConnectedBroadcast(NetworkInfo info) { NetworkStack.checkNetworkStackPermission(mContext); sendGeneralBroadcast(info, CONNECTIVITY_ACTION); } private void sendInetConditionBroadcast(NetworkInfo info) { sendGeneralBroadcast(info, ConnectivityManager.INET_CONDITION_ACTION); } private Intent makeGeneralIntent(NetworkInfo info, String bcastType) { synchronized (mVpns) { if (mLockdownTracker != null) { info = new NetworkInfo(info); mLockdownTracker.augmentNetworkInfo(info); } } Intent intent = new Intent(bcastType); intent.putExtra(ConnectivityManager.EXTRA_NETWORK_INFO, new NetworkInfo(info)); intent.putExtra(ConnectivityManager.EXTRA_NETWORK_TYPE, info.getType()); if (info.isFailover()) { intent.putExtra(ConnectivityManager.EXTRA_IS_FAILOVER, true); info.setFailover(false); } if (info.getReason() != null) { intent.putExtra(ConnectivityManager.EXTRA_REASON, info.getReason()); } if (info.getExtraInfo() != null) { intent.putExtra(ConnectivityManager.EXTRA_EXTRA_INFO, info.getExtraInfo()); } intent.putExtra(ConnectivityManager.EXTRA_INET_CONDITION, mDefaultInetConditionPublished); return intent; } private void sendGeneralBroadcast(NetworkInfo info, String bcastType) { sendStickyBroadcast(makeGeneralIntent(info, bcastType)); } private void sendDataActivityBroadcast(int deviceType, boolean active, long tsNanos) { Intent intent = new Intent(ConnectivityManager.ACTION_DATA_ACTIVITY_CHANGE); intent.putExtra(ConnectivityManager.EXTRA_DEVICE_TYPE, deviceType); intent.putExtra(ConnectivityManager.EXTRA_IS_ACTIVE, active); intent.putExtra(ConnectivityManager.EXTRA_REALTIME_NS, tsNanos); final long ident = Binder.clearCallingIdentity(); try { mContext.sendOrderedBroadcastAsUser(intent, UserHandle.ALL, RECEIVE_DATA_ACTIVITY_CHANGE, null, null, 0, null, null); } finally { Binder.restoreCallingIdentity(ident); } } private void sendStickyBroadcast(Intent intent) { synchronized (this) { if (!mSystemReady && intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) { mInitialBroadcast = new Intent(intent); } intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); if (VDBG) { log("sendStickyBroadcast: action=" + intent.getAction()); } Bundle options = null; final long ident = Binder.clearCallingIdentity(); if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) { final NetworkInfo ni = intent.getParcelableExtra( ConnectivityManager.EXTRA_NETWORK_INFO); final BroadcastOptions opts = BroadcastOptions.makeBasic(); opts.setMaxManifestReceiverApiLevel(Build.VERSION_CODES.M); options = opts.toBundle(); final IBatteryStats bs = mDeps.getBatteryStatsService(); try { bs.noteConnectivityChanged(intent.getIntExtra( ConnectivityManager.EXTRA_NETWORK_TYPE, ConnectivityManager.TYPE_NONE), ni.getState().toString()); } catch (RemoteException e) { } intent.addFlags(Intent.FLAG_RECEIVER_VISIBLE_TO_INSTANT_APPS); } try { mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL, options); } finally { Binder.restoreCallingIdentity(ident); } } } /** * Called when the system is ready and ConnectivityService can initialize remaining components. */ @VisibleForTesting public void systemReady() { // Let PermissionMonitor#startMonitoring() running in the beginning of the systemReady // before MultipathPolicyTracker.start(). Since mApps in PermissionMonitor needs to be // populated first to ensure that listening network request which is sent by // MultipathPolicyTracker won't be added NET_CAPABILITY_FOREGROUND capability. mPermissionMonitor.startMonitoring(); mProxyTracker.loadGlobalProxy(); registerNetdEventCallback(); synchronized (this) { mSystemReady = true; if (mInitialBroadcast != null) { mContext.sendStickyBroadcastAsUser(mInitialBroadcast, UserHandle.ALL); mInitialBroadcast = null; } } // Try bringing up tracker, but KeyStore won't be ready yet for secondary users so wait // for user to unlock device too. updateLockdownVpn(); // Create network requests for always-on networks. mHandler.sendMessage(mHandler.obtainMessage(EVENT_CONFIGURE_ALWAYS_ON_NETWORKS)); mHandler.sendMessage(mHandler.obtainMessage(EVENT_SYSTEM_READY)); } /** * Setup data activity tracking for the given network. * * Every {@code setupDataActivityTracking} should be paired with a * {@link #removeDataActivityTracking} for cleanup. */ private void setupDataActivityTracking(NetworkAgentInfo networkAgent) { final String iface = networkAgent.linkProperties.getInterfaceName(); final int timeout; final int type; if (networkAgent.networkCapabilities.hasTransport( NetworkCapabilities.TRANSPORT_CELLULAR)) { timeout = Settings.Global.getInt(mContext.getContentResolver(), Settings.Global.DATA_ACTIVITY_TIMEOUT_MOBILE, 10); type = ConnectivityManager.TYPE_MOBILE; } else if (networkAgent.networkCapabilities.hasTransport( NetworkCapabilities.TRANSPORT_WIFI)) { timeout = Settings.Global.getInt(mContext.getContentResolver(), Settings.Global.DATA_ACTIVITY_TIMEOUT_WIFI, 15); type = ConnectivityManager.TYPE_WIFI; } else { return; // do not track any other networks } if (timeout > 0 && iface != null) { try { mNMS.addIdleTimer(iface, timeout, type); } catch (Exception e) { // You shall not crash! loge("Exception in setupDataActivityTracking " + e); } } } /** * Remove data activity tracking when network disconnects. */ private void removeDataActivityTracking(NetworkAgentInfo networkAgent) { final String iface = networkAgent.linkProperties.getInterfaceName(); final NetworkCapabilities caps = networkAgent.networkCapabilities; if (iface != null && (caps.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) || caps.hasTransport(NetworkCapabilities.TRANSPORT_WIFI))) { try { // the call fails silently if no idle timer setup for this interface mNMS.removeIdleTimer(iface); } catch (Exception e) { loge("Exception in removeDataActivityTracking " + e); } } } /** * Update data activity tracking when network state is updated. */ private void updateDataActivityTracking(NetworkAgentInfo newNetwork, NetworkAgentInfo oldNetwork) { if (newNetwork != null) { setupDataActivityTracking(newNetwork); } if (oldNetwork != null) { removeDataActivityTracking(oldNetwork); } } /** * Reads the network specific MTU size from resources. * and set it on it's iface. */ private void updateMtu(LinkProperties newLp, LinkProperties oldLp) { final String iface = newLp.getInterfaceName(); final int mtu = newLp.getMtu(); if (oldLp == null && mtu == 0) { // Silently ignore unset MTU value. return; } if (oldLp != null && newLp.isIdenticalMtu(oldLp)) { if (VDBG) log("identical MTU - not setting"); return; } if (!LinkProperties.isValidMtu(mtu, newLp.hasGlobalIpv6Address())) { if (mtu != 0) loge("Unexpected mtu value: " + mtu + ", " + iface); return; } // Cannot set MTU without interface name if (TextUtils.isEmpty(iface)) { loge("Setting MTU size with null iface."); return; } try { if (VDBG || DDBG) log("Setting MTU size: " + iface + ", " + mtu); mNMS.setMtu(iface, mtu); } catch (Exception e) { Slog.e(TAG, "exception in setMtu()" + e); } } @VisibleForTesting protected static final String DEFAULT_TCP_BUFFER_SIZES = "4096,87380,110208,4096,16384,110208"; private void updateTcpBufferSizes(String tcpBufferSizes) { String[] values = null; if (tcpBufferSizes != null) { values = tcpBufferSizes.split(","); } if (values == null || values.length != 6) { if (DBG) log("Invalid tcpBufferSizes string: " + tcpBufferSizes +", using defaults"); tcpBufferSizes = DEFAULT_TCP_BUFFER_SIZES; values = tcpBufferSizes.split(","); } if (tcpBufferSizes.equals(mCurrentTcpBufferSizes)) return; try { if (VDBG || DDBG) Slog.d(TAG, "Setting tx/rx TCP buffers to " + tcpBufferSizes); String rmemValues = String.join(" ", values[0], values[1], values[2]); String wmemValues = String.join(" ", values[3], values[4], values[5]); mNetd.setTcpRWmemorySize(rmemValues, wmemValues); mCurrentTcpBufferSizes = tcpBufferSizes; } catch (RemoteException | ServiceSpecificException e) { loge("Can't set TCP buffer sizes:" + e); } Integer rwndValue = Settings.Global.getInt(mContext.getContentResolver(), Settings.Global.TCP_DEFAULT_INIT_RWND, mSystemProperties.getInt("net.tcp.default_init_rwnd", 0)); final String sysctlKey = "sys.sysctl.tcp_def_init_rwnd"; if (rwndValue != 0) { mSystemProperties.set(sysctlKey, rwndValue.toString()); } } @Override public int getRestoreDefaultNetworkDelay(int networkType) { String restoreDefaultNetworkDelayStr = mSystemProperties.get( NETWORK_RESTORE_DELAY_PROP_NAME); if(restoreDefaultNetworkDelayStr != null && restoreDefaultNetworkDelayStr.length() != 0) { try { return Integer.parseInt(restoreDefaultNetworkDelayStr); } catch (NumberFormatException e) { } } // if the system property isn't set, use the value for the apn type int ret = RESTORE_DEFAULT_NETWORK_DELAY; if ((networkType <= ConnectivityManager.MAX_NETWORK_TYPE) && (mNetConfigs[networkType] != null)) { ret = mNetConfigs[networkType].restoreTime; } return ret; } private void dumpNetworkDiagnostics(IndentingPrintWriter pw) { final List netDiags = new ArrayList(); final long DIAG_TIME_MS = 5000; for (NetworkAgentInfo nai : networksSortedById()) { PrivateDnsConfig privateDnsCfg = mDnsManager.getPrivateDnsConfig(nai.network); // Start gathering diagnostic information. netDiags.add(new NetworkDiagnostics( nai.network, new LinkProperties(nai.linkProperties), // Must be a copy. privateDnsCfg, DIAG_TIME_MS)); } for (NetworkDiagnostics netDiag : netDiags) { pw.println(); netDiag.waitForMeasurements(); netDiag.dump(pw); } } @Override protected void dump(@NonNull FileDescriptor fd, @NonNull PrintWriter writer, @Nullable String[] args) { PriorityDump.dump(mPriorityDumper, fd, writer, args); } private void doDump(FileDescriptor fd, PrintWriter writer, String[] args, boolean asProto) { final IndentingPrintWriter pw = new IndentingPrintWriter(writer, " "); if (!DumpUtils.checkDumpPermission(mContext, TAG, pw)) return; if (asProto) return; if (ArrayUtils.contains(args, DIAG_ARG)) { dumpNetworkDiagnostics(pw); return; } else if (ArrayUtils.contains(args, NETWORK_ARG)) { dumpNetworks(pw); return; } else if (ArrayUtils.contains(args, REQUEST_ARG)) { dumpNetworkRequests(pw); return; } pw.print("NetworkProviders for:"); for (NetworkProviderInfo npi : mNetworkProviderInfos.values()) { pw.print(" " + npi.name); } pw.println(); pw.println(); final NetworkAgentInfo defaultNai = getDefaultNetwork(); pw.print("Active default network: "); if (defaultNai == null) { pw.println("none"); } else { pw.println(defaultNai.network.netId); } pw.println(); pw.println("Current Networks:"); pw.increaseIndent(); dumpNetworks(pw); pw.decreaseIndent(); pw.println(); pw.print("Restrict background: "); pw.println(mRestrictBackground); pw.println(); pw.println("Status for known UIDs:"); pw.increaseIndent(); final int size = mUidRules.size(); for (int i = 0; i < size; i++) { // Don't crash if the array is modified while dumping in bugreports. try { final int uid = mUidRules.keyAt(i); final int uidRules = mUidRules.get(uid, RULE_NONE); pw.println("UID=" + uid + " rules=" + uidRulesToString(uidRules)); } catch (ArrayIndexOutOfBoundsException e) { pw.println(" ArrayIndexOutOfBoundsException"); } catch (ConcurrentModificationException e) { pw.println(" ConcurrentModificationException"); } } pw.println(); pw.decreaseIndent(); pw.println("Network Requests:"); pw.increaseIndent(); dumpNetworkRequests(pw); pw.decreaseIndent(); pw.println(); mLegacyTypeTracker.dump(pw); pw.println(); mKeepaliveTracker.dump(pw); pw.println(); dumpAvoidBadWifiSettings(pw); pw.println(); mMultipathPolicyTracker.dump(pw); if (ArrayUtils.contains(args, SHORT_ARG) == false) { pw.println(); pw.println("mNetworkRequestInfoLogs (most recent first):"); pw.increaseIndent(); mNetworkRequestInfoLogs.reverseDump(fd, pw, args); pw.decreaseIndent(); pw.println(); pw.println("mNetworkInfoBlockingLogs (most recent first):"); pw.increaseIndent(); mNetworkInfoBlockingLogs.reverseDump(fd, pw, args); pw.decreaseIndent(); pw.println(); pw.println("NetTransition WakeLock activity (most recent first):"); pw.increaseIndent(); pw.println("total acquisitions: " + mTotalWakelockAcquisitions); pw.println("total releases: " + mTotalWakelockReleases); pw.println("cumulative duration: " + (mTotalWakelockDurationMs / 1000) + "s"); pw.println("longest duration: " + (mMaxWakelockDurationMs / 1000) + "s"); if (mTotalWakelockAcquisitions > mTotalWakelockReleases) { long duration = SystemClock.elapsedRealtime() - mLastWakeLockAcquireTimestamp; pw.println("currently holding WakeLock for: " + (duration / 1000) + "s"); } mWakelockLogs.reverseDump(fd, pw, args); pw.println(); pw.println("bandwidth update requests (by uid):"); pw.increaseIndent(); synchronized (mBandwidthRequests) { for (int i = 0; i < mBandwidthRequests.size(); i++) { pw.println("[" + mBandwidthRequests.keyAt(i) + "]: " + mBandwidthRequests.valueAt(i)); } } pw.decreaseIndent(); pw.decreaseIndent(); } pw.println(); pw.println("NetworkStackClient logs:"); pw.increaseIndent(); NetworkStackClient.getInstance().dump(pw); pw.decreaseIndent(); pw.println(); pw.println("Permission Monitor:"); pw.increaseIndent(); mPermissionMonitor.dump(pw); pw.decreaseIndent(); } private void dumpNetworks(IndentingPrintWriter pw) { for (NetworkAgentInfo nai : networksSortedById()) { pw.println(nai.toString()); pw.increaseIndent(); pw.println(String.format( "Requests: REQUEST:%d LISTEN:%d BACKGROUND_REQUEST:%d total:%d", nai.numForegroundNetworkRequests(), nai.numNetworkRequests() - nai.numRequestNetworkRequests(), nai.numBackgroundNetworkRequests(), nai.numNetworkRequests())); pw.increaseIndent(); for (int i = 0; i < nai.numNetworkRequests(); i++) { pw.println(nai.requestAt(i).toString()); } pw.decreaseIndent(); pw.println("Lingered:"); pw.increaseIndent(); nai.dumpLingerTimers(pw); pw.decreaseIndent(); pw.decreaseIndent(); } } private void dumpNetworkRequests(IndentingPrintWriter pw) { for (NetworkRequestInfo nri : requestsSortedById()) { pw.println(nri.toString()); } } /** * Return an array of all current NetworkAgentInfos sorted by network id. */ private NetworkAgentInfo[] networksSortedById() { NetworkAgentInfo[] networks = new NetworkAgentInfo[0]; networks = mNetworkAgentInfos.values().toArray(networks); Arrays.sort(networks, Comparator.comparingInt(nai -> nai.network.netId)); return networks; } /** * Return an array of all current NetworkRequest sorted by request id. */ private NetworkRequestInfo[] requestsSortedById() { NetworkRequestInfo[] requests = new NetworkRequestInfo[0]; requests = mNetworkRequests.values().toArray(requests); Arrays.sort(requests, Comparator.comparingInt(nri -> nri.request.requestId)); return requests; } private boolean isLiveNetworkAgent(NetworkAgentInfo nai, int what) { if (nai.network == null) return false; final NetworkAgentInfo officialNai = getNetworkAgentInfoForNetwork(nai.network); if (officialNai != null && officialNai.equals(nai)) return true; if (officialNai != null || VDBG) { loge(eventName(what) + " - isLiveNetworkAgent found mismatched netId: " + officialNai + " - " + nai); } return false; } // must be stateless - things change under us. private class NetworkStateTrackerHandler extends Handler { public NetworkStateTrackerHandler(Looper looper) { super(looper); } private boolean maybeHandleAsyncChannelMessage(Message msg) { switch (msg.what) { default: return false; case AsyncChannel.CMD_CHANNEL_HALF_CONNECTED: { handleAsyncChannelHalfConnect(msg); break; } case AsyncChannel.CMD_CHANNEL_DISCONNECT: { NetworkAgentInfo nai = mNetworkAgentInfos.get(msg.replyTo); if (nai != null) nai.asyncChannel.disconnect(); break; } case AsyncChannel.CMD_CHANNEL_DISCONNECTED: { handleAsyncChannelDisconnected(msg); break; } } return true; } private void maybeHandleNetworkAgentMessage(Message msg) { NetworkAgentInfo nai = mNetworkAgentInfos.get(msg.replyTo); if (nai == null) { if (VDBG) { log(String.format("%s from unknown NetworkAgent", eventName(msg.what))); } return; } switch (msg.what) { case NetworkAgent.EVENT_NETWORK_CAPABILITIES_CHANGED: { NetworkCapabilities networkCapabilities = (NetworkCapabilities) msg.obj; if (networkCapabilities.hasConnectivityManagedCapability()) { Slog.wtf(TAG, "BUG: " + nai + " has CS-managed capability."); } if (networkCapabilities.hasTransport(TRANSPORT_TEST)) { // Make sure the original object is not mutated. NetworkAgent normally // makes a copy of the capabilities when sending the message through // the Messenger, but if this ever changes, not making a defensive copy // here will give attack vectors to clients using this code path. networkCapabilities = new NetworkCapabilities(networkCapabilities); networkCapabilities.restrictCapabilitesForTestNetwork(nai.creatorUid); } updateCapabilities(nai.getCurrentScore(), nai, networkCapabilities); break; } case NetworkAgent.EVENT_NETWORK_PROPERTIES_CHANGED: { LinkProperties newLp = (LinkProperties) msg.obj; processLinkPropertiesFromAgent(nai, newLp); handleUpdateLinkProperties(nai, newLp); break; } case NetworkAgent.EVENT_NETWORK_INFO_CHANGED: { NetworkInfo info = (NetworkInfo) msg.obj; updateNetworkInfo(nai, info); break; } case NetworkAgent.EVENT_NETWORK_SCORE_CHANGED: { updateNetworkScore(nai, msg.arg1); break; } case NetworkAgent.EVENT_SET_EXPLICITLY_SELECTED: { if (nai.everConnected) { loge("ERROR: cannot call explicitlySelected on already-connected network"); } nai.networkAgentConfig.explicitlySelected = toBool(msg.arg1); nai.networkAgentConfig.acceptUnvalidated = toBool(msg.arg1) && toBool(msg.arg2); // Mark the network as temporarily accepting partial connectivity so that it // will be validated (and possibly become default) even if it only provides // partial internet access. Note that if user connects to partial connectivity // and choose "don't ask again", then wifi disconnected by some reasons(maybe // out of wifi coverage) and if the same wifi is available again, the device // will auto connect to this wifi even though the wifi has "no internet". // TODO: Evaluate using a separate setting in IpMemoryStore. nai.networkAgentConfig.acceptPartialConnectivity = toBool(msg.arg2); break; } case NetworkAgent.EVENT_SOCKET_KEEPALIVE: { mKeepaliveTracker.handleEventSocketKeepalive(nai, msg); break; } } } private boolean maybeHandleNetworkMonitorMessage(Message msg) { switch (msg.what) { default: return false; case EVENT_PROBE_STATUS_CHANGED: { final Integer netId = (Integer) msg.obj; final NetworkAgentInfo nai = getNetworkAgentInfoForNetId(netId); if (nai == null) { break; } final boolean probePrivateDnsCompleted = ((msg.arg1 & NETWORK_VALIDATION_PROBE_PRIVDNS) != 0); final boolean privateDnsBroken = ((msg.arg2 & NETWORK_VALIDATION_PROBE_PRIVDNS) == 0); if (probePrivateDnsCompleted) { if (nai.networkCapabilities.isPrivateDnsBroken() != privateDnsBroken) { nai.networkCapabilities.setPrivateDnsBroken(privateDnsBroken); final int oldScore = nai.getCurrentScore(); updateCapabilities(oldScore, nai, nai.networkCapabilities); } // Only show the notification when the private DNS is broken and the // PRIVATE_DNS_BROKEN notification hasn't shown since last valid. if (privateDnsBroken && !nai.networkAgentConfig.hasShownBroken) { showNetworkNotification(nai, NotificationType.PRIVATE_DNS_BROKEN); } nai.networkAgentConfig.hasShownBroken = privateDnsBroken; } else if (nai.networkCapabilities.isPrivateDnsBroken()) { // If probePrivateDnsCompleted is false but nai.networkCapabilities says // private DNS is broken, it means this network is being reevaluated. // Either probing private DNS is not necessary any more or it hasn't been // done yet. In either case, the networkCapabilities should be updated to // reflect the new status. nai.networkCapabilities.setPrivateDnsBroken(false); final int oldScore = nai.getCurrentScore(); updateCapabilities(oldScore, nai, nai.networkCapabilities); nai.networkAgentConfig.hasShownBroken = false; } break; } case EVENT_NETWORK_TESTED: { final NetworkTestedResults results = (NetworkTestedResults) msg.obj; final NetworkAgentInfo nai = getNetworkAgentInfoForNetId(results.mNetId); if (nai == null) break; handleNetworkTested(nai, results.mTestResult, (results.mRedirectUrl == null) ? "" : results.mRedirectUrl); break; } case EVENT_PROVISIONING_NOTIFICATION: { final int netId = msg.arg2; final boolean visible = toBool(msg.arg1); final NetworkAgentInfo nai = getNetworkAgentInfoForNetId(netId); // If captive portal status has changed, update capabilities or disconnect. if (nai != null && (visible != nai.lastCaptivePortalDetected)) { final int oldScore = nai.getCurrentScore(); nai.lastCaptivePortalDetected = visible; nai.everCaptivePortalDetected |= visible; if (nai.lastCaptivePortalDetected && Settings.Global.CAPTIVE_PORTAL_MODE_AVOID == getCaptivePortalMode()) { if (DBG) log("Avoiding captive portal network: " + nai.toShortString()); nai.asyncChannel.sendMessage( NetworkAgent.CMD_PREVENT_AUTOMATIC_RECONNECT); teardownUnneededNetwork(nai); break; } updateCapabilities(oldScore, nai, nai.networkCapabilities); } if (!visible) { // Only clear SIGN_IN and NETWORK_SWITCH notifications here, or else other // notifications belong to the same network may be cleared unexpectedly. mNotifier.clearNotification(netId, NotificationType.SIGN_IN); mNotifier.clearNotification(netId, NotificationType.NETWORK_SWITCH); } else { if (nai == null) { loge("EVENT_PROVISIONING_NOTIFICATION from unknown NetworkMonitor"); break; } if (!nai.networkAgentConfig.provisioningNotificationDisabled) { mNotifier.showNotification(netId, NotificationType.SIGN_IN, nai, null, (PendingIntent) msg.obj, nai.networkAgentConfig.explicitlySelected); } } break; } case EVENT_PRIVATE_DNS_CONFIG_RESOLVED: { final NetworkAgentInfo nai = getNetworkAgentInfoForNetId(msg.arg2); if (nai == null) break; updatePrivateDns(nai, (PrivateDnsConfig) msg.obj); break; } case EVENT_CAPPORT_DATA_CHANGED: { final NetworkAgentInfo nai = getNetworkAgentInfoForNetId(msg.arg2); if (nai == null) break; handleCaptivePortalDataUpdate(nai, (CaptivePortalData) msg.obj); break; } } return true; } private void handleNetworkTested( @NonNull NetworkAgentInfo nai, int testResult, @NonNull String redirectUrl) { final boolean wasPartial = nai.partialConnectivity; nai.partialConnectivity = ((testResult & NETWORK_VALIDATION_RESULT_PARTIAL) != 0); final boolean partialConnectivityChanged = (wasPartial != nai.partialConnectivity); final boolean valid = ((testResult & NETWORK_VALIDATION_RESULT_VALID) != 0); final boolean wasValidated = nai.lastValidated; final boolean wasDefault = isDefaultNetwork(nai); if (DBG) { final String logMsg = !TextUtils.isEmpty(redirectUrl) ? " with redirect to " + redirectUrl : ""; log(nai.toShortString() + " validation " + (valid ? "passed" : "failed") + logMsg); } if (valid != nai.lastValidated) { if (wasDefault) { mDeps.getMetricsLogger() .defaultNetworkMetrics().logDefaultNetworkValidity( SystemClock.elapsedRealtime(), valid); } final int oldScore = nai.getCurrentScore(); nai.lastValidated = valid; nai.everValidated |= valid; updateCapabilities(oldScore, nai, nai.networkCapabilities); // If score has changed, rebroadcast to NetworkProviders. b/17726566 if (oldScore != nai.getCurrentScore()) sendUpdatedScoreToFactories(nai); if (valid) { handleFreshlyValidatedNetwork(nai); // Clear NO_INTERNET, PRIVATE_DNS_BROKEN, PARTIAL_CONNECTIVITY and // LOST_INTERNET notifications if network becomes valid. mNotifier.clearNotification(nai.network.netId, NotificationType.NO_INTERNET); mNotifier.clearNotification(nai.network.netId, NotificationType.LOST_INTERNET); mNotifier.clearNotification(nai.network.netId, NotificationType.PARTIAL_CONNECTIVITY); mNotifier.clearNotification(nai.network.netId, NotificationType.PRIVATE_DNS_BROKEN); // If network becomes valid, the hasShownBroken should be reset for // that network so that the notification will be fired when the private // DNS is broken again. nai.networkAgentConfig.hasShownBroken = false; } } else if (partialConnectivityChanged) { updateCapabilities(nai.getCurrentScore(), nai, nai.networkCapabilities); } updateInetCondition(nai); // Let the NetworkAgent know the state of its network Bundle redirectUrlBundle = new Bundle(); redirectUrlBundle.putString(NetworkAgent.REDIRECT_URL_KEY, redirectUrl); // TODO: Evaluate to update partial connectivity to status to NetworkAgent. nai.asyncChannel.sendMessage( NetworkAgent.CMD_REPORT_NETWORK_STATUS, (valid ? NetworkAgent.VALID_NETWORK : NetworkAgent.INVALID_NETWORK), 0, redirectUrlBundle); // If NetworkMonitor detects partial connectivity before // EVENT_PROMPT_UNVALIDATED arrives, show the partial connectivity notification // immediately. Re-notify partial connectivity silently if no internet // notification already there. if (!wasPartial && nai.partialConnectivity) { // Remove delayed message if there is a pending message. mHandler.removeMessages(EVENT_PROMPT_UNVALIDATED, nai.network); handlePromptUnvalidated(nai.network); } if (wasValidated && !nai.lastValidated) { handleNetworkUnvalidated(nai); } } private int getCaptivePortalMode() { return Settings.Global.getInt(mContext.getContentResolver(), Settings.Global.CAPTIVE_PORTAL_MODE, Settings.Global.CAPTIVE_PORTAL_MODE_PROMPT); } private boolean maybeHandleNetworkAgentInfoMessage(Message msg) { switch (msg.what) { default: return false; case NetworkAgentInfo.EVENT_NETWORK_LINGER_COMPLETE: { NetworkAgentInfo nai = (NetworkAgentInfo) msg.obj; if (nai != null && isLiveNetworkAgent(nai, msg.what)) { handleLingerComplete(nai); } break; } } return true; } @Override public void handleMessage(Message msg) { if (!maybeHandleAsyncChannelMessage(msg) && !maybeHandleNetworkMonitorMessage(msg) && !maybeHandleNetworkAgentInfoMessage(msg)) { maybeHandleNetworkAgentMessage(msg); } } } private class NetworkMonitorCallbacks extends INetworkMonitorCallbacks.Stub { private final int mNetId; private final AutodestructReference mNai; private NetworkMonitorCallbacks(NetworkAgentInfo nai) { mNetId = nai.network.netId; mNai = new AutodestructReference<>(nai); } @Override public void onNetworkMonitorCreated(INetworkMonitor networkMonitor) { mHandler.sendMessage(mHandler.obtainMessage(EVENT_REGISTER_NETWORK_AGENT, new Pair<>(mNai.getAndDestroy(), networkMonitor))); } @Override public void notifyNetworkTested(int testResult, @Nullable String redirectUrl) { // Legacy version of notifyNetworkTestedWithExtras. // Would only be called if the system has a NetworkStack module older than the // framework, which does not happen in practice. Slog.wtf(TAG, "Deprecated notifyNetworkTested called: no action taken"); } @Override public void notifyNetworkTestedWithExtras(NetworkTestResultParcelable p) { // Notify mTrackerHandler and mConnectivityDiagnosticsHandler of the event. Both use // the same looper so messages will be processed in sequence. final Message msg = mTrackerHandler.obtainMessage( EVENT_NETWORK_TESTED, new NetworkTestedResults( mNetId, p.result, p.timestampMillis, p.redirectUrl)); mTrackerHandler.sendMessage(msg); // Invoke ConnectivityReport generation for this Network test event. final NetworkAgentInfo nai = getNetworkAgentInfoForNetId(mNetId); if (nai == null) return; final Message m = mConnectivityDiagnosticsHandler.obtainMessage( ConnectivityDiagnosticsHandler.EVENT_NETWORK_TESTED, new ConnectivityReportEvent(p.timestampMillis, nai)); final PersistableBundle extras = new PersistableBundle(); extras.putInt(KEY_NETWORK_VALIDATION_RESULT, p.result); extras.putInt(KEY_NETWORK_PROBES_SUCCEEDED_BITMASK, p.probesSucceeded); extras.putInt(KEY_NETWORK_PROBES_ATTEMPTED_BITMASK, p.probesAttempted); m.setData(new Bundle(extras)); mConnectivityDiagnosticsHandler.sendMessage(m); } @Override public void notifyPrivateDnsConfigResolved(PrivateDnsConfigParcel config) { mTrackerHandler.sendMessage(mTrackerHandler.obtainMessage( EVENT_PRIVATE_DNS_CONFIG_RESOLVED, 0, mNetId, PrivateDnsConfig.fromParcel(config))); } @Override public void notifyProbeStatusChanged(int probesCompleted, int probesSucceeded) { mTrackerHandler.sendMessage(mTrackerHandler.obtainMessage( EVENT_PROBE_STATUS_CHANGED, probesCompleted, probesSucceeded, new Integer(mNetId))); } @Override public void notifyCaptivePortalDataChanged(CaptivePortalData data) { mTrackerHandler.sendMessage(mTrackerHandler.obtainMessage( EVENT_CAPPORT_DATA_CHANGED, 0, mNetId, data)); } @Override public void showProvisioningNotification(String action, String packageName) { final Intent intent = new Intent(action); intent.setPackage(packageName); final PendingIntent pendingIntent; // Only the system server can register notifications with package "android" final long token = Binder.clearCallingIdentity(); try { pendingIntent = PendingIntent.getBroadcast( mContext, 0 /* requestCode */, intent, PendingIntent.FLAG_IMMUTABLE); } finally { Binder.restoreCallingIdentity(token); } mTrackerHandler.sendMessage(mTrackerHandler.obtainMessage( EVENT_PROVISIONING_NOTIFICATION, PROVISIONING_NOTIFICATION_SHOW, mNetId, pendingIntent)); } @Override public void hideProvisioningNotification() { mTrackerHandler.sendMessage(mTrackerHandler.obtainMessage( EVENT_PROVISIONING_NOTIFICATION, PROVISIONING_NOTIFICATION_HIDE, mNetId)); } @Override public void notifyDataStallSuspected(DataStallReportParcelable p) { ConnectivityService.this.notifyDataStallSuspected(p, mNetId); } @Override public int getInterfaceVersion() { return this.VERSION; } @Override public String getInterfaceHash() { return this.HASH; } } private void notifyDataStallSuspected(DataStallReportParcelable p, int netId) { log("Data stall detected with methods: " + p.detectionMethod); final PersistableBundle extras = new PersistableBundle(); int detectionMethod = 0; if (hasDataStallDetectionMethod(p, DETECTION_METHOD_DNS_EVENTS)) { extras.putInt(KEY_DNS_CONSECUTIVE_TIMEOUTS, p.dnsConsecutiveTimeouts); detectionMethod |= DETECTION_METHOD_DNS_EVENTS; } if (hasDataStallDetectionMethod(p, DETECTION_METHOD_TCP_METRICS)) { extras.putInt(KEY_TCP_PACKET_FAIL_RATE, p.tcpPacketFailRate); extras.putInt(KEY_TCP_METRICS_COLLECTION_PERIOD_MILLIS, p.tcpMetricsCollectionPeriodMillis); detectionMethod |= DETECTION_METHOD_TCP_METRICS; } final Message msg = mConnectivityDiagnosticsHandler.obtainMessage( ConnectivityDiagnosticsHandler.EVENT_DATA_STALL_SUSPECTED, detectionMethod, netId, p.timestampMillis); msg.setData(new Bundle(extras)); // NetworkStateTrackerHandler currently doesn't take any actions based on data // stalls so send the message directly to ConnectivityDiagnosticsHandler and avoid // the cost of going through two handlers. mConnectivityDiagnosticsHandler.sendMessage(msg); } private boolean hasDataStallDetectionMethod(DataStallReportParcelable p, int detectionMethod) { return (p.detectionMethod & detectionMethod) != 0; } private boolean networkRequiresPrivateDnsValidation(NetworkAgentInfo nai) { return isPrivateDnsValidationRequired(nai.networkCapabilities); } private void handleFreshlyValidatedNetwork(NetworkAgentInfo nai) { if (nai == null) return; // If the Private DNS mode is opportunistic, reprogram the DNS servers // in order to restart a validation pass from within netd. final PrivateDnsConfig cfg = mDnsManager.getPrivateDnsConfig(); if (cfg.useTls && TextUtils.isEmpty(cfg.hostname)) { updateDnses(nai.linkProperties, null, nai.network.netId); } } private void handlePrivateDnsSettingsChanged() { final PrivateDnsConfig cfg = mDnsManager.getPrivateDnsConfig(); for (NetworkAgentInfo nai : mNetworkAgentInfos.values()) { handlePerNetworkPrivateDnsConfig(nai, cfg); if (networkRequiresPrivateDnsValidation(nai)) { handleUpdateLinkProperties(nai, new LinkProperties(nai.linkProperties)); } } } private void handlePerNetworkPrivateDnsConfig(NetworkAgentInfo nai, PrivateDnsConfig cfg) { // Private DNS only ever applies to networks that might provide // Internet access and therefore also require validation. if (!networkRequiresPrivateDnsValidation(nai)) return; // Notify the NetworkAgentInfo/NetworkMonitor in case NetworkMonitor needs to cancel or // schedule DNS resolutions. If a DNS resolution is required the // result will be sent back to us. nai.networkMonitor().notifyPrivateDnsChanged(cfg.toParcel()); // With Private DNS bypass support, we can proceed to update the // Private DNS config immediately, even if we're in strict mode // and have not yet resolved the provider name into a set of IPs. updatePrivateDns(nai, cfg); } private void updatePrivateDns(NetworkAgentInfo nai, PrivateDnsConfig newCfg) { mDnsManager.updatePrivateDns(nai.network, newCfg); updateDnses(nai.linkProperties, null, nai.network.netId); } private void handlePrivateDnsValidationUpdate(PrivateDnsValidationUpdate update) { NetworkAgentInfo nai = getNetworkAgentInfoForNetId(update.netId); if (nai == null) { return; } mDnsManager.updatePrivateDnsValidation(update); handleUpdateLinkProperties(nai, new LinkProperties(nai.linkProperties)); } private void handleNat64PrefixEvent(int netId, boolean added, String prefixString, int prefixLength) { NetworkAgentInfo nai = mNetworkForNetId.get(netId); if (nai == null) return; log(String.format("NAT64 prefix %s on netId %d: %s/%d", (added ? "added" : "removed"), netId, prefixString, prefixLength)); IpPrefix prefix = null; if (added) { try { prefix = new IpPrefix(InetAddresses.parseNumericAddress(prefixString), prefixLength); } catch (IllegalArgumentException e) { loge("Invalid NAT64 prefix " + prefixString + "/" + prefixLength); return; } } nai.clatd.setNat64PrefixFromDns(prefix); handleUpdateLinkProperties(nai, new LinkProperties(nai.linkProperties)); } private void handleCaptivePortalDataUpdate(@NonNull final NetworkAgentInfo nai, @Nullable final CaptivePortalData data) { nai.captivePortalData = data; // CaptivePortalData will be merged into LinkProperties from NetworkAgentInfo handleUpdateLinkProperties(nai, new LinkProperties(nai.linkProperties)); } /** * Updates the linger state from the network requests inside the NAI. * @param nai the agent info to update * @param now the timestamp of the event causing this update * @return whether the network was lingered as a result of this update */ private boolean updateLingerState(@NonNull final NetworkAgentInfo nai, final long now) { // 1. Update the linger timer. If it's changed, reschedule or cancel the alarm. // 2. If the network was lingering and there are now requests, unlinger it. // 3. If this network is unneeded (which implies it is not lingering), and there is at least // one lingered request, start lingering. nai.updateLingerTimer(); if (nai.isLingering() && nai.numForegroundNetworkRequests() > 0) { if (DBG) log("Unlingering " + nai.toShortString()); nai.unlinger(); logNetworkEvent(nai, NetworkEvent.NETWORK_UNLINGER); } else if (unneeded(nai, UnneededFor.LINGER) && nai.getLingerExpiry() > 0) { if (DBG) { final int lingerTime = (int) (nai.getLingerExpiry() - now); log("Lingering " + nai.toShortString() + " for " + lingerTime + "ms"); } nai.linger(); logNetworkEvent(nai, NetworkEvent.NETWORK_LINGER); return true; } return false; } private void handleAsyncChannelHalfConnect(Message msg) { ensureRunningOnConnectivityServiceThread(); final AsyncChannel ac = (AsyncChannel) msg.obj; if (mNetworkProviderInfos.containsKey(msg.replyTo)) { if (msg.arg1 == AsyncChannel.STATUS_SUCCESSFUL) { if (VDBG) log("NetworkFactory connected"); // Finish setting up the full connection NetworkProviderInfo npi = mNetworkProviderInfos.get(msg.replyTo); npi.completeConnection(); sendAllRequestsToProvider(npi); } else { loge("Error connecting NetworkFactory"); mNetworkProviderInfos.remove(msg.obj); } } else if (mNetworkAgentInfos.containsKey(msg.replyTo)) { if (msg.arg1 == AsyncChannel.STATUS_SUCCESSFUL) { if (VDBG) log("NetworkAgent connected"); // A network agent has requested a connection. Establish the connection. mNetworkAgentInfos.get(msg.replyTo).asyncChannel. sendMessage(AsyncChannel.CMD_CHANNEL_FULL_CONNECTION); } else { loge("Error connecting NetworkAgent"); NetworkAgentInfo nai = mNetworkAgentInfos.remove(msg.replyTo); if (nai != null) { final boolean wasDefault = isDefaultNetwork(nai); synchronized (mNetworkForNetId) { mNetworkForNetId.remove(nai.network.netId); } mNetIdManager.releaseNetId(nai.network.netId); // Just in case. mLegacyTypeTracker.remove(nai, wasDefault); } } } } // This is a no-op if it's called with a message designating a network that has // already been destroyed, because its reference will not be found in the relevant // maps. private void handleAsyncChannelDisconnected(Message msg) { NetworkAgentInfo nai = mNetworkAgentInfos.get(msg.replyTo); if (nai != null) { disconnectAndDestroyNetwork(nai); } else { NetworkProviderInfo npi = mNetworkProviderInfos.remove(msg.replyTo); if (DBG && npi != null) log("unregisterNetworkFactory for " + npi.name); } } // Destroys a network, remove references to it from the internal state managed by // ConnectivityService, free its interfaces and clean up. // Must be called on the Handler thread. private void disconnectAndDestroyNetwork(NetworkAgentInfo nai) { ensureRunningOnConnectivityServiceThread(); if (DBG) { log(nai.toShortString() + " disconnected, was satisfying " + nai.numNetworkRequests()); } // Clear all notifications of this network. mNotifier.clearNotification(nai.network.netId); // A network agent has disconnected. // TODO - if we move the logic to the network agent (have them disconnect // because they lost all their requests or because their score isn't good) // then they would disconnect organically, report their new state and then // disconnect the channel. if (nai.networkInfo.isConnected()) { nai.networkInfo.setDetailedState(NetworkInfo.DetailedState.DISCONNECTED, null, null); } final boolean wasDefault = isDefaultNetwork(nai); if (wasDefault) { mDefaultInetConditionPublished = 0; // Log default network disconnection before required book-keeping. // Let rematchAllNetworksAndRequests() below record a new default network event // if there is a fallback. Taken together, the two form a X -> 0, 0 -> Y sequence // whose timestamps tell how long it takes to recover a default network. long now = SystemClock.elapsedRealtime(); mDeps.getMetricsLogger().defaultNetworkMetrics().logDefaultNetworkEvent(now, null, nai); } notifyIfacesChangedForNetworkStats(); // TODO - we shouldn't send CALLBACK_LOST to requests that can be satisfied // by other networks that are already connected. Perhaps that can be done by // sending all CALLBACK_LOST messages (for requests, not listens) at the end // of rematchAllNetworksAndRequests notifyNetworkCallbacks(nai, ConnectivityManager.CALLBACK_LOST); mKeepaliveTracker.handleStopAllKeepalives(nai, SocketKeepalive.ERROR_INVALID_NETWORK); for (String iface : nai.linkProperties.getAllInterfaceNames()) { // Disable wakeup packet monitoring for each interface. wakeupModifyInterface(iface, nai.networkCapabilities, false); } nai.networkMonitor().notifyNetworkDisconnected(); mNetworkAgentInfos.remove(nai.messenger); nai.clatd.update(); synchronized (mNetworkForNetId) { // Remove the NetworkAgent, but don't mark the netId as // available until we've told netd to delete it below. mNetworkForNetId.remove(nai.network.netId); } // Remove all previously satisfied requests. for (int i = 0; i < nai.numNetworkRequests(); i++) { NetworkRequest request = nai.requestAt(i); final NetworkRequestInfo nri = mNetworkRequests.get(request); final NetworkAgentInfo currentNetwork = nri.mSatisfier; if (currentNetwork != null && currentNetwork.network.netId == nai.network.netId) { nri.mSatisfier = null; sendUpdatedScoreToFactories(request, null); } } nai.clearLingerState(); if (nai.isSatisfyingRequest(mDefaultRequest.requestId)) { mDefaultNetworkNai = null; updateDataActivityTracking(null /* newNetwork */, nai); notifyLockdownVpn(nai); ensureNetworkTransitionWakelock(nai.toShortString()); } mLegacyTypeTracker.remove(nai, wasDefault); if (!nai.networkCapabilities.hasTransport(TRANSPORT_VPN)) { updateAllVpnsCapabilities(); } rematchAllNetworksAndRequests(); mLingerMonitor.noteDisconnect(nai); if (nai.created) { // Tell netd to clean up the configuration for this network // (routing rules, DNS, etc). // This may be slow as it requires a lot of netd shelling out to ip and // ip[6]tables to flush routes and remove the incoming packet mark rule, so do it // after we've rematched networks with requests which should make a potential // fallback network the default or requested a new network from the // NetworkProviders, so network traffic isn't interrupted for an unnecessarily // long time. destroyNativeNetwork(nai); mDnsManager.removeNetwork(nai.network); } mNetIdManager.releaseNetId(nai.network.netId); } private boolean createNativeNetwork(@NonNull NetworkAgentInfo networkAgent) { try { // This should never fail. Specifying an already in use NetID will cause failure. if (networkAgent.isVPN()) { mNetd.networkCreateVpn(networkAgent.network.netId, (networkAgent.networkAgentConfig == null || !networkAgent.networkAgentConfig.allowBypass)); } else { mNetd.networkCreatePhysical(networkAgent.network.netId, getNetworkPermission(networkAgent.networkCapabilities)); } mDnsResolver.createNetworkCache(networkAgent.network.netId); mDnsManager.updateTransportsForNetwork(networkAgent.network.netId, networkAgent.networkCapabilities.getTransportTypes()); return true; } catch (RemoteException | ServiceSpecificException e) { loge("Error creating network " + networkAgent.network.netId + ": " + e.getMessage()); return false; } } private void destroyNativeNetwork(@NonNull NetworkAgentInfo networkAgent) { try { mNetd.networkDestroy(networkAgent.network.netId); mDnsResolver.destroyNetworkCache(networkAgent.network.netId); } catch (RemoteException | ServiceSpecificException e) { loge("Exception destroying network: " + e); } } // If this method proves to be too slow then we can maintain a separate // pendingIntent => NetworkRequestInfo map. // This method assumes that every non-null PendingIntent maps to exactly 1 NetworkRequestInfo. private NetworkRequestInfo findExistingNetworkRequestInfo(PendingIntent pendingIntent) { Intent intent = pendingIntent.getIntent(); for (Map.Entry entry : mNetworkRequests.entrySet()) { PendingIntent existingPendingIntent = entry.getValue().mPendingIntent; if (existingPendingIntent != null && existingPendingIntent.getIntent().filterEquals(intent)) { return entry.getValue(); } } return null; } private void handleRegisterNetworkRequestWithIntent(Message msg) { final NetworkRequestInfo nri = (NetworkRequestInfo) (msg.obj); NetworkRequestInfo existingRequest = findExistingNetworkRequestInfo(nri.mPendingIntent); if (existingRequest != null) { // remove the existing request. if (DBG) log("Replacing " + existingRequest.request + " with " + nri.request + " because their intents matched."); handleReleaseNetworkRequest(existingRequest.request, getCallingUid(), /* callOnUnavailable */ false); } handleRegisterNetworkRequest(nri); } private void handleRegisterNetworkRequest(NetworkRequestInfo nri) { ensureRunningOnConnectivityServiceThread(); mNetworkRequests.put(nri.request, nri); mNetworkRequestInfoLogs.log("REGISTER " + nri); if (nri.request.isListen()) { for (NetworkAgentInfo network : mNetworkAgentInfos.values()) { if (nri.request.networkCapabilities.hasSignalStrength() && network.satisfiesImmutableCapabilitiesOf(nri.request)) { updateSignalStrengthThresholds(network, "REGISTER", nri.request); } } } rematchAllNetworksAndRequests(); if (nri.request.isRequest() && nri.mSatisfier == null) { sendUpdatedScoreToFactories(nri.request, null); } } private void handleReleaseNetworkRequestWithIntent(PendingIntent pendingIntent, int callingUid) { NetworkRequestInfo nri = findExistingNetworkRequestInfo(pendingIntent); if (nri != null) { handleReleaseNetworkRequest(nri.request, callingUid, /* callOnUnavailable */ false); } } // Determines whether the network is the best (or could become the best, if it validated), for // none of a particular type of NetworkRequests. The type of NetworkRequests considered depends // on the value of reason: // // - UnneededFor.TEARDOWN: non-listen NetworkRequests. If a network is unneeded for this reason, // then it should be torn down. // - UnneededFor.LINGER: foreground NetworkRequests. If a network is unneeded for this reason, // then it should be lingered. private boolean unneeded(NetworkAgentInfo nai, UnneededFor reason) { ensureRunningOnConnectivityServiceThread(); final int numRequests; switch (reason) { case TEARDOWN: numRequests = nai.numRequestNetworkRequests(); break; case LINGER: numRequests = nai.numForegroundNetworkRequests(); break; default: Slog.wtf(TAG, "Invalid reason. Cannot happen."); return true; } if (!nai.everConnected || nai.isVPN() || nai.isLingering() || numRequests > 0) { return false; } for (NetworkRequestInfo nri : mNetworkRequests.values()) { if (reason == UnneededFor.LINGER && nri.request.isBackgroundRequest()) { // Background requests don't affect lingering. continue; } // If this Network is already the highest scoring Network for a request, or if // there is hope for it to become one if it validated, then it is needed. if (nri.request.isRequest() && nai.satisfies(nri.request) && (nai.isSatisfyingRequest(nri.request.requestId) || // Note that this catches two important cases: // 1. Unvalidated cellular will not be reaped when unvalidated WiFi // is currently satisfying the request. This is desirable when // cellular ends up validating but WiFi does not. // 2. Unvalidated WiFi will not be reaped when validated cellular // is currently satisfying the request. This is desirable when // WiFi ends up validating and out scoring cellular. nri.mSatisfier.getCurrentScore() < nai.getCurrentScoreAsValidated())) { return false; } } return true; } private NetworkRequestInfo getNriForAppRequest( NetworkRequest request, int callingUid, String requestedOperation) { final NetworkRequestInfo nri = mNetworkRequests.get(request); if (nri != null) { if (Process.SYSTEM_UID != callingUid && Process.NETWORK_STACK_UID != callingUid && nri.mUid != callingUid) { log(String.format("UID %d attempted to %s for unowned request %s", callingUid, requestedOperation, nri)); return null; } } return nri; } private void handleTimedOutNetworkRequest(final NetworkRequestInfo nri) { ensureRunningOnConnectivityServiceThread(); if (mNetworkRequests.get(nri.request) == null) { return; } if (nri.mSatisfier != null) { return; } if (VDBG || (DBG && nri.request.isRequest())) { log("releasing " + nri.request + " (timeout)"); } handleRemoveNetworkRequest(nri); callCallbackForRequest(nri, null, ConnectivityManager.CALLBACK_UNAVAIL, 0); } private void handleReleaseNetworkRequest(NetworkRequest request, int callingUid, boolean callOnUnavailable) { final NetworkRequestInfo nri = getNriForAppRequest(request, callingUid, "release NetworkRequest"); if (nri == null) { return; } if (VDBG || (DBG && nri.request.isRequest())) { log("releasing " + nri.request + " (release request)"); } handleRemoveNetworkRequest(nri); if (callOnUnavailable) { callCallbackForRequest(nri, null, ConnectivityManager.CALLBACK_UNAVAIL, 0); } } private void handleRemoveNetworkRequest(final NetworkRequestInfo nri) { ensureRunningOnConnectivityServiceThread(); nri.unlinkDeathRecipient(); mNetworkRequests.remove(nri.request); decrementNetworkRequestPerUidCount(nri); mNetworkRequestInfoLogs.log("RELEASE " + nri); if (nri.request.isRequest()) { boolean wasKept = false; final NetworkAgentInfo nai = nri.mSatisfier; if (nai != null) { boolean wasBackgroundNetwork = nai.isBackgroundNetwork(); nai.removeRequest(nri.request.requestId); if (VDBG || DDBG) { log(" Removing from current network " + nai.toShortString() + ", leaving " + nai.numNetworkRequests() + " requests."); } // If there are still lingered requests on this network, don't tear it down, // but resume lingering instead. final long now = SystemClock.elapsedRealtime(); if (updateLingerState(nai, now)) { notifyNetworkLosing(nai, now); } if (unneeded(nai, UnneededFor.TEARDOWN)) { if (DBG) log("no live requests for " + nai.toShortString() + "; disconnecting"); teardownUnneededNetwork(nai); } else { wasKept = true; } nri.mSatisfier = null; if (!wasBackgroundNetwork && nai.isBackgroundNetwork()) { // Went from foreground to background. updateCapabilities(nai.getCurrentScore(), nai, nai.networkCapabilities); } } // Maintain the illusion. When this request arrived, we might have pretended // that a network connected to serve it, even though the network was already // connected. Now that this request has gone away, we might have to pretend // that the network disconnected. LegacyTypeTracker will generate that // phantom disconnect for this type. if (nri.request.legacyType != TYPE_NONE && nai != null) { boolean doRemove = true; if (wasKept) { // check if any of the remaining requests for this network are for the // same legacy type - if so, don't remove the nai for (int i = 0; i < nai.numNetworkRequests(); i++) { NetworkRequest otherRequest = nai.requestAt(i); if (otherRequest.legacyType == nri.request.legacyType && otherRequest.isRequest()) { if (DBG) log(" still have other legacy request - leaving"); doRemove = false; } } } if (doRemove) { mLegacyTypeTracker.remove(nri.request.legacyType, nai, false); } } for (NetworkProviderInfo npi : mNetworkProviderInfos.values()) { npi.cancelRequest(nri.request); } } else { // listens don't have a singular affectedNetwork. Check all networks to see // if this listen request applies and remove it. for (NetworkAgentInfo nai : mNetworkAgentInfos.values()) { nai.removeRequest(nri.request.requestId); if (nri.request.networkCapabilities.hasSignalStrength() && nai.satisfiesImmutableCapabilitiesOf(nri.request)) { updateSignalStrengthThresholds(nai, "RELEASE", nri.request); } } } } private void decrementNetworkRequestPerUidCount(final NetworkRequestInfo nri) { synchronized (mUidToNetworkRequestCount) { final int requests = mUidToNetworkRequestCount.get(nri.mUid, 0); if (requests < 1) { Slog.wtf(TAG, "BUG: too small request count " + requests + " for UID " + nri.mUid); } else if (requests == 1) { mUidToNetworkRequestCount.removeAt(mUidToNetworkRequestCount.indexOfKey(nri.mUid)); } else { mUidToNetworkRequestCount.put(nri.mUid, requests - 1); } } } @Override public void setAcceptUnvalidated(Network network, boolean accept, boolean always) { enforceNetworkStackSettingsOrSetup(); mHandler.sendMessage(mHandler.obtainMessage(EVENT_SET_ACCEPT_UNVALIDATED, encodeBool(accept), encodeBool(always), network)); } @Override public void setAcceptPartialConnectivity(Network network, boolean accept, boolean always) { enforceNetworkStackSettingsOrSetup(); mHandler.sendMessage(mHandler.obtainMessage(EVENT_SET_ACCEPT_PARTIAL_CONNECTIVITY, encodeBool(accept), encodeBool(always), network)); } @Override public void setAvoidUnvalidated(Network network) { enforceNetworkStackSettingsOrSetup(); mHandler.sendMessage(mHandler.obtainMessage(EVENT_SET_AVOID_UNVALIDATED, network)); } private void handleSetAcceptUnvalidated(Network network, boolean accept, boolean always) { if (DBG) log("handleSetAcceptUnvalidated network=" + network + " accept=" + accept + " always=" + always); NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network); if (nai == null) { // Nothing to do. return; } if (nai.everValidated) { // The network validated while the dialog box was up. Take no action. return; } if (!nai.networkAgentConfig.explicitlySelected) { Slog.wtf(TAG, "BUG: setAcceptUnvalidated non non-explicitly selected network"); } if (accept != nai.networkAgentConfig.acceptUnvalidated) { nai.networkAgentConfig.acceptUnvalidated = accept; // If network becomes partial connectivity and user already accepted to use this // network, we should respect the user's option and don't need to popup the // PARTIAL_CONNECTIVITY notification to user again. nai.networkAgentConfig.acceptPartialConnectivity = accept; rematchAllNetworksAndRequests(); sendUpdatedScoreToFactories(nai); } if (always) { nai.asyncChannel.sendMessage( NetworkAgent.CMD_SAVE_ACCEPT_UNVALIDATED, encodeBool(accept)); } if (!accept) { // Tell the NetworkAgent to not automatically reconnect to the network. nai.asyncChannel.sendMessage(NetworkAgent.CMD_PREVENT_AUTOMATIC_RECONNECT); // Teardown the network. teardownUnneededNetwork(nai); } } private void handleSetAcceptPartialConnectivity(Network network, boolean accept, boolean always) { if (DBG) { log("handleSetAcceptPartialConnectivity network=" + network + " accept=" + accept + " always=" + always); } final NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network); if (nai == null) { // Nothing to do. return; } if (nai.lastValidated) { // The network validated while the dialog box was up. Take no action. return; } if (accept != nai.networkAgentConfig.acceptPartialConnectivity) { nai.networkAgentConfig.acceptPartialConnectivity = accept; } // TODO: Use the current design or save the user choice into IpMemoryStore. if (always) { nai.asyncChannel.sendMessage( NetworkAgent.CMD_SAVE_ACCEPT_UNVALIDATED, encodeBool(accept)); } if (!accept) { // Tell the NetworkAgent to not automatically reconnect to the network. nai.asyncChannel.sendMessage(NetworkAgent.CMD_PREVENT_AUTOMATIC_RECONNECT); // Tear down the network. teardownUnneededNetwork(nai); } else { // Inform NetworkMonitor that partial connectivity is acceptable. This will likely // result in a partial connectivity result which will be processed by // maybeHandleNetworkMonitorMessage. // // TODO: NetworkMonitor does not refer to the "never ask again" bit. The bit is stored // per network. Therefore, NetworkMonitor may still do https probe. nai.networkMonitor().setAcceptPartialConnectivity(); } } private void handleSetAvoidUnvalidated(Network network) { NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network); if (nai == null || nai.lastValidated) { // Nothing to do. The network either disconnected or revalidated. return; } if (!nai.avoidUnvalidated) { nai.avoidUnvalidated = true; rematchAllNetworksAndRequests(); sendUpdatedScoreToFactories(nai); } } private void scheduleUnvalidatedPrompt(NetworkAgentInfo nai) { if (VDBG) log("scheduleUnvalidatedPrompt " + nai.network); mHandler.sendMessageDelayed( mHandler.obtainMessage(EVENT_PROMPT_UNVALIDATED, nai.network), PROMPT_UNVALIDATED_DELAY_MS); } @Override public void startCaptivePortalApp(Network network) { enforceNetworkStackOrSettingsPermission(); mHandler.post(() -> { NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network); if (nai == null) return; if (!nai.networkCapabilities.hasCapability(NET_CAPABILITY_CAPTIVE_PORTAL)) return; nai.networkMonitor().launchCaptivePortalApp(); }); } /** * NetworkStack endpoint to start the captive portal app. The NetworkStack needs to use this * endpoint as it does not have INTERACT_ACROSS_USERS_FULL itself. * @param network Network on which the captive portal was detected. * @param appExtras Bundle to use as intent extras for the captive portal application. * Must be treated as opaque to avoid preventing the captive portal app to * update its arguments. */ @Override public void startCaptivePortalAppInternal(Network network, Bundle appExtras) { mContext.enforceCallingOrSelfPermission(NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK, "ConnectivityService"); final Intent appIntent = new Intent(ConnectivityManager.ACTION_CAPTIVE_PORTAL_SIGN_IN); appIntent.putExtras(appExtras); appIntent.putExtra(ConnectivityManager.EXTRA_CAPTIVE_PORTAL, new CaptivePortal(new CaptivePortalImpl(network).asBinder())); appIntent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK); Binder.withCleanCallingIdentity(() -> mContext.startActivityAsUser(appIntent, UserHandle.CURRENT)); } private class CaptivePortalImpl extends ICaptivePortal.Stub { private final Network mNetwork; private CaptivePortalImpl(Network network) { mNetwork = network; } @Override public void appResponse(final int response) { if (response == CaptivePortal.APP_RETURN_WANTED_AS_IS) { enforceSettingsPermission(); } final NetworkMonitorManager nm = getNetworkMonitorManager(mNetwork); if (nm == null) return; nm.notifyCaptivePortalAppFinished(response); } @Override public void appRequest(final int request) { final NetworkMonitorManager nm = getNetworkMonitorManager(mNetwork); if (nm == null) return; if (request == CaptivePortal.APP_REQUEST_REEVALUATION_REQUIRED) { checkNetworkStackPermission(); nm.forceReevaluation(Binder.getCallingUid()); } } @Nullable private NetworkMonitorManager getNetworkMonitorManager(final Network network) { // getNetworkAgentInfoForNetwork is thread-safe final NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network); if (nai == null) return null; // nai.networkMonitor() is thread-safe return nai.networkMonitor(); } @Override public void logEvent(int eventId, String packageName) { enforceSettingsPermission(); new MetricsLogger().action(eventId, packageName); } } public boolean avoidBadWifi() { return mMultinetworkPolicyTracker.getAvoidBadWifi(); } /** * Return whether the device should maintain continuous, working connectivity by switching away * from WiFi networks having no connectivity. * @see MultinetworkPolicyTracker#getAvoidBadWifi() */ public boolean shouldAvoidBadWifi() { if (!checkNetworkStackPermission()) { throw new SecurityException("avoidBadWifi requires NETWORK_STACK permission"); } return avoidBadWifi(); } private void rematchForAvoidBadWifiUpdate() { rematchAllNetworksAndRequests(); for (NetworkAgentInfo nai: mNetworkAgentInfos.values()) { if (nai.networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) { sendUpdatedScoreToFactories(nai); } } } // TODO: Evaluate whether this is of interest to other consumers of // MultinetworkPolicyTracker and worth moving out of here. private void dumpAvoidBadWifiSettings(IndentingPrintWriter pw) { final boolean configRestrict = mMultinetworkPolicyTracker.configRestrictsAvoidBadWifi(); if (!configRestrict) { pw.println("Bad Wi-Fi avoidance: unrestricted"); return; } pw.println("Bad Wi-Fi avoidance: " + avoidBadWifi()); pw.increaseIndent(); pw.println("Config restrict: " + configRestrict); final String value = mMultinetworkPolicyTracker.getAvoidBadWifiSetting(); String description; // Can't use a switch statement because strings are legal case labels, but null is not. if ("0".equals(value)) { description = "get stuck"; } else if (value == null) { description = "prompt"; } else if ("1".equals(value)) { description = "avoid"; } else { description = value + " (?)"; } pw.println("User setting: " + description); pw.println("Network overrides:"); pw.increaseIndent(); for (NetworkAgentInfo nai : networksSortedById()) { if (nai.avoidUnvalidated) { pw.println(nai.toShortString()); } } pw.decreaseIndent(); pw.decreaseIndent(); } // TODO: This method is copied from TetheringNotificationUpdater. Should have a utility class to // unify the method. private static @NonNull String getSettingsPackageName(@NonNull final PackageManager pm) { final Intent settingsIntent = new Intent(Settings.ACTION_SETTINGS); final ComponentName settingsComponent = settingsIntent.resolveActivity(pm); return settingsComponent != null ? settingsComponent.getPackageName() : "com.android.settings"; } private void showNetworkNotification(NetworkAgentInfo nai, NotificationType type) { final String action; final boolean highPriority; switch (type) { case NO_INTERNET: action = ConnectivityManager.ACTION_PROMPT_UNVALIDATED; // High priority because it is only displayed for explicitly selected networks. highPriority = true; break; case PRIVATE_DNS_BROKEN: action = Settings.ACTION_WIRELESS_SETTINGS; // High priority because we should let user know why there is no internet. highPriority = true; break; case LOST_INTERNET: action = ConnectivityManager.ACTION_PROMPT_LOST_VALIDATION; // High priority because it could help the user avoid unexpected data usage. highPriority = true; break; case PARTIAL_CONNECTIVITY: action = ConnectivityManager.ACTION_PROMPT_PARTIAL_CONNECTIVITY; // Don't bother the user with a high-priority notification if the network was not // explicitly selected by the user. highPriority = nai.networkAgentConfig.explicitlySelected; break; default: Slog.wtf(TAG, "Unknown notification type " + type); return; } Intent intent = new Intent(action); if (type != NotificationType.PRIVATE_DNS_BROKEN) { intent.setData(Uri.fromParts("netId", Integer.toString(nai.network.netId), null)); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // Some OEMs have their own Settings package. Thus, need to get the current using // Settings package name instead of just use default name "com.android.settings". final String settingsPkgName = getSettingsPackageName(mContext.getPackageManager()); intent.setClassName(settingsPkgName, settingsPkgName + ".wifi.WifiNoInternetDialog"); } PendingIntent pendingIntent = PendingIntent.getActivityAsUser( mContext, 0 /* requestCode */, intent, PendingIntent.FLAG_CANCEL_CURRENT | PendingIntent.FLAG_IMMUTABLE, null /* options */, UserHandle.CURRENT); mNotifier.showNotification(nai.network.netId, type, nai, null, pendingIntent, highPriority); } private boolean shouldPromptUnvalidated(NetworkAgentInfo nai) { // Don't prompt if the network is validated, and don't prompt on captive portals // because we're already prompting the user to sign in. if (nai.everValidated || nai.everCaptivePortalDetected) { return false; } // If a network has partial connectivity, always prompt unless the user has already accepted // partial connectivity and selected don't ask again. This ensures that if the device // automatically connects to a network that has partial Internet access, the user will // always be able to use it, either because they've already chosen "don't ask again" or // because we have prompt them. if (nai.partialConnectivity && !nai.networkAgentConfig.acceptPartialConnectivity) { return true; } // If a network has no Internet access, only prompt if the network was explicitly selected // and if the user has not already told us to use the network regardless of whether it // validated or not. if (nai.networkAgentConfig.explicitlySelected && !nai.networkAgentConfig.acceptUnvalidated) { return true; } return false; } private void handlePromptUnvalidated(Network network) { if (VDBG || DDBG) log("handlePromptUnvalidated " + network); NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network); if (nai == null || !shouldPromptUnvalidated(nai)) { return; } // Stop automatically reconnecting to this network in the future. Automatically connecting // to a network that provides no or limited connectivity is not useful, because the user // cannot use that network except through the notification shown by this method, and the // notification is only shown if the network is explicitly selected by the user. nai.asyncChannel.sendMessage(NetworkAgent.CMD_PREVENT_AUTOMATIC_RECONNECT); // TODO: Evaluate if it's needed to wait 8 seconds for triggering notification when // NetworkMonitor detects the network is partial connectivity. Need to change the design to // popup the notification immediately when the network is partial connectivity. if (nai.partialConnectivity) { showNetworkNotification(nai, NotificationType.PARTIAL_CONNECTIVITY); } else { showNetworkNotification(nai, NotificationType.NO_INTERNET); } } private void handleNetworkUnvalidated(NetworkAgentInfo nai) { NetworkCapabilities nc = nai.networkCapabilities; if (DBG) log("handleNetworkUnvalidated " + nai.toShortString() + " cap=" + nc); if (!nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) { return; } if (mMultinetworkPolicyTracker.shouldNotifyWifiUnvalidated()) { showNetworkNotification(nai, NotificationType.LOST_INTERNET); } } @Override public int getMultipathPreference(Network network) { enforceAccessPermission(); NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network); if (nai != null && nai.networkCapabilities .hasCapability(NetworkCapabilities.NET_CAPABILITY_NOT_METERED)) { return ConnectivityManager.MULTIPATH_PREFERENCE_UNMETERED; } Integer networkPreference = mMultipathPolicyTracker.getMultipathPreference(network); if (networkPreference != null) { return networkPreference; } return mMultinetworkPolicyTracker.getMeteredMultipathPreference(); } @Override public NetworkRequest getDefaultRequest() { return mDefaultRequest; } private class InternalHandler extends Handler { public InternalHandler(Looper looper) { super(looper); } @Override public void handleMessage(Message msg) { switch (msg.what) { case EVENT_EXPIRE_NET_TRANSITION_WAKELOCK: case EVENT_CLEAR_NET_TRANSITION_WAKELOCK: { handleReleaseNetworkTransitionWakelock(msg.what); break; } case EVENT_APPLY_GLOBAL_HTTP_PROXY: { mProxyTracker.loadDeprecatedGlobalHttpProxy(); break; } case EVENT_PROXY_HAS_CHANGED: { handleApplyDefaultProxy((ProxyInfo)msg.obj); break; } case EVENT_REGISTER_NETWORK_PROVIDER: { handleRegisterNetworkProvider((NetworkProviderInfo) msg.obj); break; } case EVENT_UNREGISTER_NETWORK_PROVIDER: { handleUnregisterNetworkProvider((Messenger) msg.obj); break; } case EVENT_REGISTER_NETWORK_AGENT: { final Pair arg = (Pair) msg.obj; handleRegisterNetworkAgent(arg.first, arg.second); break; } case EVENT_REGISTER_NETWORK_REQUEST: case EVENT_REGISTER_NETWORK_LISTENER: { handleRegisterNetworkRequest((NetworkRequestInfo) msg.obj); break; } case EVENT_REGISTER_NETWORK_REQUEST_WITH_INTENT: case EVENT_REGISTER_NETWORK_LISTENER_WITH_INTENT: { handleRegisterNetworkRequestWithIntent(msg); break; } case EVENT_TIMEOUT_NETWORK_REQUEST: { NetworkRequestInfo nri = (NetworkRequestInfo) msg.obj; handleTimedOutNetworkRequest(nri); break; } case EVENT_RELEASE_NETWORK_REQUEST_WITH_INTENT: { handleReleaseNetworkRequestWithIntent((PendingIntent) msg.obj, msg.arg1); break; } case EVENT_RELEASE_NETWORK_REQUEST: { handleReleaseNetworkRequest((NetworkRequest) msg.obj, msg.arg1, /* callOnUnavailable */ false); break; } case EVENT_SET_ACCEPT_UNVALIDATED: { Network network = (Network) msg.obj; handleSetAcceptUnvalidated(network, toBool(msg.arg1), toBool(msg.arg2)); break; } case EVENT_SET_ACCEPT_PARTIAL_CONNECTIVITY: { Network network = (Network) msg.obj; handleSetAcceptPartialConnectivity(network, toBool(msg.arg1), toBool(msg.arg2)); break; } case EVENT_SET_AVOID_UNVALIDATED: { handleSetAvoidUnvalidated((Network) msg.obj); break; } case EVENT_PROMPT_UNVALIDATED: { handlePromptUnvalidated((Network) msg.obj); break; } case EVENT_CONFIGURE_ALWAYS_ON_NETWORKS: { handleConfigureAlwaysOnNetworks(); break; } // Sent by KeepaliveTracker to process an app request on the state machine thread. case NetworkAgent.CMD_START_SOCKET_KEEPALIVE: { mKeepaliveTracker.handleStartKeepalive(msg); break; } // Sent by KeepaliveTracker to process an app request on the state machine thread. case NetworkAgent.CMD_STOP_SOCKET_KEEPALIVE: { NetworkAgentInfo nai = getNetworkAgentInfoForNetwork((Network) msg.obj); int slot = msg.arg1; int reason = msg.arg2; mKeepaliveTracker.handleStopKeepalive(nai, slot, reason); break; } case EVENT_SYSTEM_READY: { mMultipathPolicyTracker.start(); break; } case EVENT_REVALIDATE_NETWORK: { handleReportNetworkConnectivity((Network) msg.obj, msg.arg1, toBool(msg.arg2)); break; } case EVENT_PRIVATE_DNS_SETTINGS_CHANGED: handlePrivateDnsSettingsChanged(); break; case EVENT_PRIVATE_DNS_VALIDATION_UPDATE: handlePrivateDnsValidationUpdate( (PrivateDnsValidationUpdate) msg.obj); break; case EVENT_UID_RULES_CHANGED: handleUidRulesChanged(msg.arg1, msg.arg2); break; case EVENT_DATA_SAVER_CHANGED: handleRestrictBackgroundChanged(toBool(msg.arg1)); break; } } } @Override @Deprecated public int getLastTetherError(String iface) { final TetheringManager tm = (TetheringManager) mContext.getSystemService( Context.TETHERING_SERVICE); return tm.getLastTetherError(iface); } @Override @Deprecated public String[] getTetherableIfaces() { final TetheringManager tm = (TetheringManager) mContext.getSystemService( Context.TETHERING_SERVICE); return tm.getTetherableIfaces(); } @Override @Deprecated public String[] getTetheredIfaces() { final TetheringManager tm = (TetheringManager) mContext.getSystemService( Context.TETHERING_SERVICE); return tm.getTetheredIfaces(); } @Override @Deprecated public String[] getTetheringErroredIfaces() { final TetheringManager tm = (TetheringManager) mContext.getSystemService( Context.TETHERING_SERVICE); return tm.getTetheringErroredIfaces(); } @Override @Deprecated public String[] getTetherableUsbRegexs() { final TetheringManager tm = (TetheringManager) mContext.getSystemService( Context.TETHERING_SERVICE); return tm.getTetherableUsbRegexs(); } @Override @Deprecated public String[] getTetherableWifiRegexs() { final TetheringManager tm = (TetheringManager) mContext.getSystemService( Context.TETHERING_SERVICE); return tm.getTetherableWifiRegexs(); } // Called when we lose the default network and have no replacement yet. // This will automatically be cleared after X seconds or a new default network // becomes CONNECTED, whichever happens first. The timer is started by the // first caller and not restarted by subsequent callers. private void ensureNetworkTransitionWakelock(String forWhom) { synchronized (this) { if (mNetTransitionWakeLock.isHeld()) { return; } mNetTransitionWakeLock.acquire(); mLastWakeLockAcquireTimestamp = SystemClock.elapsedRealtime(); mTotalWakelockAcquisitions++; } mWakelockLogs.log("ACQUIRE for " + forWhom); Message msg = mHandler.obtainMessage(EVENT_EXPIRE_NET_TRANSITION_WAKELOCK); mHandler.sendMessageDelayed(msg, mNetTransitionWakeLockTimeout); } // Called when we gain a new default network to release the network transition wakelock in a // second, to allow a grace period for apps to reconnect over the new network. Pending expiry // message is cancelled. private void scheduleReleaseNetworkTransitionWakelock() { synchronized (this) { if (!mNetTransitionWakeLock.isHeld()) { return; // expiry message released the lock first. } } // Cancel self timeout on wakelock hold. mHandler.removeMessages(EVENT_EXPIRE_NET_TRANSITION_WAKELOCK); Message msg = mHandler.obtainMessage(EVENT_CLEAR_NET_TRANSITION_WAKELOCK); mHandler.sendMessageDelayed(msg, 1000); } // Called when either message of ensureNetworkTransitionWakelock or // scheduleReleaseNetworkTransitionWakelock is processed. private void handleReleaseNetworkTransitionWakelock(int eventId) { String event = eventName(eventId); synchronized (this) { if (!mNetTransitionWakeLock.isHeld()) { mWakelockLogs.log(String.format("RELEASE: already released (%s)", event)); Slog.w(TAG, "expected Net Transition WakeLock to be held"); return; } mNetTransitionWakeLock.release(); long lockDuration = SystemClock.elapsedRealtime() - mLastWakeLockAcquireTimestamp; mTotalWakelockDurationMs += lockDuration; mMaxWakelockDurationMs = Math.max(mMaxWakelockDurationMs, lockDuration); mTotalWakelockReleases++; } mWakelockLogs.log(String.format("RELEASE (%s)", event)); } // 100 percent is full good, 0 is full bad. @Override public void reportInetCondition(int networkType, int percentage) { NetworkAgentInfo nai = mLegacyTypeTracker.getNetworkForType(networkType); if (nai == null) return; reportNetworkConnectivity(nai.network, percentage > 50); } @Override public void reportNetworkConnectivity(Network network, boolean hasConnectivity) { enforceAccessPermission(); enforceInternetPermission(); final int uid = Binder.getCallingUid(); final int connectivityInfo = encodeBool(hasConnectivity); // Handle ConnectivityDiagnostics event before attempting to revalidate the network. This // forces an ordering of ConnectivityDiagnostics events in the case where hasConnectivity // does not match the known connectivity of the network - this causes NetworkMonitor to // revalidate the network and generate a ConnectivityDiagnostics ConnectivityReport event. final NetworkAgentInfo nai; if (network == null) { nai = getDefaultNetwork(); } else { nai = getNetworkAgentInfoForNetwork(network); } if (nai != null) { mConnectivityDiagnosticsHandler.sendMessage( mConnectivityDiagnosticsHandler.obtainMessage( ConnectivityDiagnosticsHandler.EVENT_NETWORK_CONNECTIVITY_REPORTED, connectivityInfo, 0, nai)); } mHandler.sendMessage( mHandler.obtainMessage(EVENT_REVALIDATE_NETWORK, uid, connectivityInfo, network)); } private void handleReportNetworkConnectivity( Network network, int uid, boolean hasConnectivity) { final NetworkAgentInfo nai; if (network == null) { nai = getDefaultNetwork(); } else { nai = getNetworkAgentInfoForNetwork(network); } if (nai == null || nai.networkInfo.getState() == NetworkInfo.State.DISCONNECTING || nai.networkInfo.getState() == NetworkInfo.State.DISCONNECTED) { return; } // Revalidate if the app report does not match our current validated state. if (hasConnectivity == nai.lastValidated) { return; } if (DBG) { int netid = nai.network.netId; log("reportNetworkConnectivity(" + netid + ", " + hasConnectivity + ") by " + uid); } // Validating a network that has not yet connected could result in a call to // rematchNetworkAndRequests() which is not meant to work on such networks. if (!nai.everConnected) { return; } LinkProperties lp = getLinkProperties(nai); if (isNetworkWithLinkPropertiesBlocked(lp, uid, false)) { return; } nai.networkMonitor().forceReevaluation(uid); } /** * Returns information about the proxy a certain network is using. If given a null network, it * it will return the proxy for the bound network for the caller app or the default proxy if * none. * * @param network the network we want to get the proxy information for. * @return Proxy information if a network has a proxy configured, or otherwise null. */ @Override public ProxyInfo getProxyForNetwork(Network network) { final ProxyInfo globalProxy = mProxyTracker.getGlobalProxy(); if (globalProxy != null) return globalProxy; if (network == null) { // Get the network associated with the calling UID. final Network activeNetwork = getActiveNetworkForUidInternal(Binder.getCallingUid(), true); if (activeNetwork == null) { return null; } return getLinkPropertiesProxyInfo(activeNetwork); } else if (mDeps.queryUserAccess(Binder.getCallingUid(), network.netId)) { // Don't call getLinkProperties() as it requires ACCESS_NETWORK_STATE permission, which // caller may not have. return getLinkPropertiesProxyInfo(network); } // No proxy info available if the calling UID does not have network access. return null; } private ProxyInfo getLinkPropertiesProxyInfo(Network network) { final NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network); if (nai == null) return null; synchronized (nai) { final ProxyInfo linkHttpProxy = nai.linkProperties.getHttpProxy(); return linkHttpProxy == null ? null : new ProxyInfo(linkHttpProxy); } } @Override public void setGlobalProxy(final ProxyInfo proxyProperties) { NetworkStack.checkNetworkStackPermission(mContext); mProxyTracker.setGlobalProxy(proxyProperties); } @Override @Nullable public ProxyInfo getGlobalProxy() { return mProxyTracker.getGlobalProxy(); } private void handleApplyDefaultProxy(ProxyInfo proxy) { if (proxy != null && TextUtils.isEmpty(proxy.getHost()) && Uri.EMPTY.equals(proxy.getPacFileUrl())) { proxy = null; } mProxyTracker.setDefaultProxy(proxy); } // If the proxy has changed from oldLp to newLp, resend proxy broadcast. This method gets called // when any network changes proxy. // TODO: Remove usage of broadcast extras as they are deprecated and not applicable in a // multi-network world where an app might be bound to a non-default network. private void updateProxy(LinkProperties newLp, LinkProperties oldLp) { ProxyInfo newProxyInfo = newLp == null ? null : newLp.getHttpProxy(); ProxyInfo oldProxyInfo = oldLp == null ? null : oldLp.getHttpProxy(); if (!ProxyTracker.proxyInfoEqual(newProxyInfo, oldProxyInfo)) { mProxyTracker.sendProxyBroadcast(); } } private static class SettingsObserver extends ContentObserver { final private HashMap mUriEventMap; final private Context mContext; final private Handler mHandler; SettingsObserver(Context context, Handler handler) { super(null); mUriEventMap = new HashMap<>(); mContext = context; mHandler = handler; } void observe(Uri uri, int what) { mUriEventMap.put(uri, what); final ContentResolver resolver = mContext.getContentResolver(); resolver.registerContentObserver(uri, false, this); } @Override public void onChange(boolean selfChange) { Slog.wtf(TAG, "Should never be reached."); } @Override public void onChange(boolean selfChange, Uri uri) { final Integer what = mUriEventMap.get(uri); if (what != null) { mHandler.obtainMessage(what).sendToTarget(); } else { loge("No matching event to send for URI=" + uri); } } } private static void log(String s) { Slog.d(TAG, s); } private static void loge(String s) { Slog.e(TAG, s); } private static void loge(String s, Throwable t) { Slog.e(TAG, s, t); } /** * Prepare for a VPN application. * VPN permissions are checked in the {@link Vpn} class. If the caller is not {@code userId}, * {@link android.Manifest.permission.INTERACT_ACROSS_USERS_FULL} permission is required. * * @param oldPackage Package name of the application which currently controls VPN, which will * be replaced. If there is no such application, this should should either be * {@code null} or {@link VpnConfig.LEGACY_VPN}. * @param newPackage Package name of the application which should gain control of VPN, or * {@code null} to disable. * @param userId User for whom to prepare the new VPN. * * @hide */ @Override public boolean prepareVpn(@Nullable String oldPackage, @Nullable String newPackage, int userId) { enforceCrossUserPermission(userId); synchronized (mVpns) { throwIfLockdownEnabled(); Vpn vpn = mVpns.get(userId); if (vpn != null) { return vpn.prepare(oldPackage, newPackage, VpnManager.TYPE_VPN_SERVICE); } else { return false; } } } /** * Set whether the VPN package has the ability to launch VPNs without user intervention. This * method is used by system-privileged apps. VPN permissions are checked in the {@link Vpn} * class. If the caller is not {@code userId}, {@link * android.Manifest.permission.INTERACT_ACROSS_USERS_FULL} permission is required. * * @param packageName The package for which authorization state should change. * @param userId User for whom {@code packageName} is installed. * @param authorized {@code true} if this app should be able to start a VPN connection without * explicit user approval, {@code false} if not. * @param vpnType The {@link VpnManager.VpnType} constant representing what class of VPN * permissions should be granted. When unauthorizing an app, {@link * VpnManager.TYPE_VPN_NONE} should be used. * @hide */ @Override public void setVpnPackageAuthorization( String packageName, int userId, @VpnManager.VpnType int vpnType) { enforceCrossUserPermission(userId); synchronized (mVpns) { Vpn vpn = mVpns.get(userId); if (vpn != null) { vpn.setPackageAuthorization(packageName, vpnType); } } } /** * Configure a TUN interface and return its file descriptor. Parameters * are encoded and opaque to this class. This method is used by VpnBuilder * and not available in ConnectivityManager. Permissions are checked in * Vpn class. * @hide */ @Override public ParcelFileDescriptor establishVpn(VpnConfig config) { int user = UserHandle.getUserId(Binder.getCallingUid()); synchronized (mVpns) { throwIfLockdownEnabled(); return mVpns.get(user).establish(config); } } /** * Stores the given VPN profile based on the provisioning package name. * *

If there is already a VPN profile stored for the provisioning package, this call will * overwrite the profile. * *

This is designed to serve the VpnManager only; settings-based VPN profiles are managed * exclusively by the Settings app, and passed into the platform at startup time. * * @return {@code true} if user consent has already been granted, {@code false} otherwise. * @hide */ @Override public boolean provisionVpnProfile(@NonNull VpnProfile profile, @NonNull String packageName) { final int user = UserHandle.getUserId(Binder.getCallingUid()); synchronized (mVpns) { return mVpns.get(user).provisionVpnProfile(packageName, profile, mKeyStore); } } /** * Deletes the stored VPN profile for the provisioning package * *

If there are no profiles for the given package, this method will silently succeed. * *

This is designed to serve the VpnManager only; settings-based VPN profiles are managed * exclusively by the Settings app, and passed into the platform at startup time. * * @hide */ @Override public void deleteVpnProfile(@NonNull String packageName) { final int user = UserHandle.getUserId(Binder.getCallingUid()); synchronized (mVpns) { mVpns.get(user).deleteVpnProfile(packageName, mKeyStore); } } /** * Starts the VPN based on the stored profile for the given package * *

This is designed to serve the VpnManager only; settings-based VPN profiles are managed * exclusively by the Settings app, and passed into the platform at startup time. * * @throws IllegalArgumentException if no profile was found for the given package name. * @hide */ @Override public void startVpnProfile(@NonNull String packageName) { final int user = UserHandle.getUserId(Binder.getCallingUid()); synchronized (mVpns) { throwIfLockdownEnabled(); mVpns.get(user).startVpnProfile(packageName, mKeyStore); } } /** * Stops the Platform VPN if the provided package is running one. * *

This is designed to serve the VpnManager only; settings-based VPN profiles are managed * exclusively by the Settings app, and passed into the platform at startup time. * * @hide */ @Override public void stopVpnProfile(@NonNull String packageName) { final int user = UserHandle.getUserId(Binder.getCallingUid()); synchronized (mVpns) { mVpns.get(user).stopVpnProfile(packageName); } } /** * Start legacy VPN, controlling native daemons as needed. Creates a * secondary thread to perform connection work, returning quickly. */ @Override public void startLegacyVpn(VpnProfile profile) { int user = UserHandle.getUserId(Binder.getCallingUid()); final LinkProperties egress = getActiveLinkProperties(); if (egress == null) { throw new IllegalStateException("Missing active network connection"); } synchronized (mVpns) { throwIfLockdownEnabled(); mVpns.get(user).startLegacyVpn(profile, mKeyStore, egress); } } /** * Return the information of the ongoing legacy VPN. This method is used * by VpnSettings and not available in ConnectivityManager. Permissions * are checked in Vpn class. */ @Override public LegacyVpnInfo getLegacyVpnInfo(int userId) { enforceCrossUserPermission(userId); synchronized (mVpns) { return mVpns.get(userId).getLegacyVpnInfo(); } } /** * Return the information of all ongoing VPNs. * *

This method is used to update NetworkStatsService. * *

Must be called on the handler thread. */ private VpnInfo[] getAllVpnInfo() { ensureRunningOnConnectivityServiceThread(); synchronized (mVpns) { if (mLockdownEnabled) { return new VpnInfo[0]; } List infoList = new ArrayList<>(); for (int i = 0; i < mVpns.size(); i++) { VpnInfo info = createVpnInfo(mVpns.valueAt(i)); if (info != null) { infoList.add(info); } } return infoList.toArray(new VpnInfo[infoList.size()]); } } /** * @return VPN information for accounting, or null if we can't retrieve all required * information, e.g underlying ifaces. */ @Nullable private VpnInfo createVpnInfo(Vpn vpn) { VpnInfo info = vpn.getVpnInfo(); if (info == null) { return null; } Network[] underlyingNetworks = vpn.getUnderlyingNetworks(); // see VpnService.setUnderlyingNetworks()'s javadoc about how to interpret // the underlyingNetworks list. if (underlyingNetworks == null) { NetworkAgentInfo defaultNai = getDefaultNetwork(); if (defaultNai != null) { underlyingNetworks = new Network[] { defaultNai.network }; } } if (underlyingNetworks != null && underlyingNetworks.length > 0) { List interfaces = new ArrayList<>(); for (Network network : underlyingNetworks) { LinkProperties lp = getLinkProperties(network); if (lp != null) { for (String iface : lp.getAllInterfaceNames()) { if (!TextUtils.isEmpty(iface)) { interfaces.add(iface); } } } } if (!interfaces.isEmpty()) { info.underlyingIfaces = interfaces.toArray(new String[interfaces.size()]); } } return info.underlyingIfaces == null ? null : info; } /** * Returns the information of the ongoing VPN for {@code userId}. This method is used by * VpnDialogs and not available in ConnectivityManager. * Permissions are checked in Vpn class. * @hide */ @Override public VpnConfig getVpnConfig(int userId) { enforceCrossUserPermission(userId); synchronized (mVpns) { Vpn vpn = mVpns.get(userId); if (vpn != null) { return vpn.getVpnConfig(); } else { return null; } } } /** * Ask all VPN objects to recompute and update their capabilities. * * When underlying networks change, VPNs may have to update capabilities to reflect things * like the metered bit, their transports, and so on. This asks the VPN objects to update * their capabilities, and as this will cause them to send messages to the ConnectivityService * handler thread through their agent, this is asynchronous. When the capabilities objects * are computed they will be up-to-date as they are computed synchronously from here and * this is running on the ConnectivityService thread. */ private void updateAllVpnsCapabilities() { Network defaultNetwork = getNetwork(getDefaultNetwork()); synchronized (mVpns) { for (int i = 0; i < mVpns.size(); i++) { final Vpn vpn = mVpns.valueAt(i); NetworkCapabilities nc = vpn.updateCapabilities(defaultNetwork); updateVpnCapabilities(vpn, nc); } } } private void updateVpnCapabilities(Vpn vpn, @Nullable NetworkCapabilities nc) { ensureRunningOnConnectivityServiceThread(); NetworkAgentInfo vpnNai = getNetworkAgentInfoForNetId(vpn.getNetId()); if (vpnNai == null || nc == null) { return; } updateCapabilities(vpnNai.getCurrentScore(), vpnNai, nc); } @Override public boolean updateLockdownVpn() { if (Binder.getCallingUid() != Process.SYSTEM_UID) { Slog.w(TAG, "Lockdown VPN only available to AID_SYSTEM"); return false; } synchronized (mVpns) { // Tear down existing lockdown if profile was removed mLockdownEnabled = LockdownVpnTracker.isEnabled(); if (mLockdownEnabled) { byte[] profileTag = mKeyStore.get(Credentials.LOCKDOWN_VPN); if (profileTag == null) { Slog.e(TAG, "Lockdown VPN configured but cannot be read from keystore"); return false; } String profileName = new String(profileTag); final VpnProfile profile = VpnProfile.decode( profileName, mKeyStore.get(Credentials.VPN + profileName)); if (profile == null) { Slog.e(TAG, "Lockdown VPN configured invalid profile " + profileName); setLockdownTracker(null); return true; } int user = UserHandle.getUserId(Binder.getCallingUid()); Vpn vpn = mVpns.get(user); if (vpn == null) { Slog.w(TAG, "VPN for user " + user + " not ready yet. Skipping lockdown"); return false; } setLockdownTracker(new LockdownVpnTracker(mContext, this, mHandler, vpn, profile)); } else { setLockdownTracker(null); } } return true; } /** * Internally set new {@link LockdownVpnTracker}, shutting down any existing * {@link LockdownVpnTracker}. Can be {@code null} to disable lockdown. */ @GuardedBy("mVpns") private void setLockdownTracker(LockdownVpnTracker tracker) { // Shutdown any existing tracker final LockdownVpnTracker existing = mLockdownTracker; // TODO: Add a trigger when the always-on VPN enable/disable to reevaluate and send the // necessary onBlockedStatusChanged callbacks. mLockdownTracker = null; if (existing != null) { existing.shutdown(); } if (tracker != null) { mLockdownTracker = tracker; mLockdownTracker.init(); } } /** * Throws if there is any currently running, always-on Legacy VPN. * *

The LockdownVpnTracker and mLockdownEnabled both track whether an always-on Legacy VPN is * running across the entire system. Tracking for app-based VPNs is done on a per-user, * per-package basis in Vpn.java */ @GuardedBy("mVpns") private void throwIfLockdownEnabled() { if (mLockdownEnabled) { throw new IllegalStateException("Unavailable in lockdown mode"); } } /** * Starts the always-on VPN {@link VpnService} for user {@param userId}, which should perform * some setup and then call {@code establish()} to connect. * * @return {@code true} if the service was started, the service was already connected, or there * was no always-on VPN to start. {@code false} otherwise. */ private boolean startAlwaysOnVpn(int userId) { synchronized (mVpns) { Vpn vpn = mVpns.get(userId); if (vpn == null) { // Shouldn't happen as all code paths that point here should have checked the Vpn // exists already. Slog.wtf(TAG, "User " + userId + " has no Vpn configuration"); return false; } return vpn.startAlwaysOnVpn(mKeyStore); } } @Override public boolean isAlwaysOnVpnPackageSupported(int userId, String packageName) { enforceSettingsPermission(); enforceCrossUserPermission(userId); synchronized (mVpns) { Vpn vpn = mVpns.get(userId); if (vpn == null) { Slog.w(TAG, "User " + userId + " has no Vpn configuration"); return false; } return vpn.isAlwaysOnPackageSupported(packageName, mKeyStore); } } @Override public boolean setAlwaysOnVpnPackage( int userId, String packageName, boolean lockdown, List lockdownWhitelist) { enforceControlAlwaysOnVpnPermission(); enforceCrossUserPermission(userId); synchronized (mVpns) { // Can't set always-on VPN if legacy VPN is already in lockdown mode. if (LockdownVpnTracker.isEnabled()) { return false; } Vpn vpn = mVpns.get(userId); if (vpn == null) { Slog.w(TAG, "User " + userId + " has no Vpn configuration"); return false; } if (!vpn.setAlwaysOnPackage(packageName, lockdown, lockdownWhitelist, mKeyStore)) { return false; } if (!startAlwaysOnVpn(userId)) { vpn.setAlwaysOnPackage(null, false, null, mKeyStore); return false; } } return true; } @Override public String getAlwaysOnVpnPackage(int userId) { enforceControlAlwaysOnVpnPermission(); enforceCrossUserPermission(userId); synchronized (mVpns) { Vpn vpn = mVpns.get(userId); if (vpn == null) { Slog.w(TAG, "User " + userId + " has no Vpn configuration"); return null; } return vpn.getAlwaysOnPackage(); } } @Override public boolean isVpnLockdownEnabled(int userId) { enforceControlAlwaysOnVpnPermission(); enforceCrossUserPermission(userId); synchronized (mVpns) { Vpn vpn = mVpns.get(userId); if (vpn == null) { Slog.w(TAG, "User " + userId + " has no Vpn configuration"); return false; } return vpn.getLockdown(); } } @Override public List getVpnLockdownWhitelist(int userId) { enforceControlAlwaysOnVpnPermission(); enforceCrossUserPermission(userId); synchronized (mVpns) { Vpn vpn = mVpns.get(userId); if (vpn == null) { Slog.w(TAG, "User " + userId + " has no Vpn configuration"); return null; } return vpn.getLockdownWhitelist(); } } @Override public int checkMobileProvisioning(int suggestedTimeOutMs) { // TODO: Remove? Any reason to trigger a provisioning check? return -1; } /** Location to an updatable file listing carrier provisioning urls. * An example: * * * * http://myserver.com/foo?mdn=%3$s&iccid=%1$s&imei=%2$s * */ private static final String PROVISIONING_URL_PATH = "/data/misc/radio/provisioning_urls.xml"; private final File mProvisioningUrlFile = new File(PROVISIONING_URL_PATH); /** XML tag for root element. */ private static final String TAG_PROVISIONING_URLS = "provisioningUrls"; /** XML tag for individual url */ private static final String TAG_PROVISIONING_URL = "provisioningUrl"; /** XML attribute for mcc */ private static final String ATTR_MCC = "mcc"; /** XML attribute for mnc */ private static final String ATTR_MNC = "mnc"; private String getProvisioningUrlBaseFromFile() { XmlPullParser parser; Configuration config = mContext.getResources().getConfiguration(); try (FileReader fileReader = new FileReader(mProvisioningUrlFile)) { parser = Xml.newPullParser(); parser.setInput(fileReader); XmlUtils.beginDocument(parser, TAG_PROVISIONING_URLS); while (true) { XmlUtils.nextElement(parser); String element = parser.getName(); if (element == null) break; if (element.equals(TAG_PROVISIONING_URL)) { String mcc = parser.getAttributeValue(null, ATTR_MCC); try { if (mcc != null && Integer.parseInt(mcc) == config.mcc) { String mnc = parser.getAttributeValue(null, ATTR_MNC); if (mnc != null && Integer.parseInt(mnc) == config.mnc) { parser.next(); if (parser.getEventType() == XmlPullParser.TEXT) { return parser.getText(); } } } } catch (NumberFormatException e) { loge("NumberFormatException in getProvisioningUrlBaseFromFile: " + e); } } } return null; } catch (FileNotFoundException e) { loge("Carrier Provisioning Urls file not found"); } catch (XmlPullParserException e) { loge("Xml parser exception reading Carrier Provisioning Urls file: " + e); } catch (IOException e) { loge("I/O exception reading Carrier Provisioning Urls file: " + e); } return null; } @Override public String getMobileProvisioningUrl() { enforceSettingsPermission(); String url = getProvisioningUrlBaseFromFile(); if (TextUtils.isEmpty(url)) { url = mContext.getResources().getString(R.string.mobile_provisioning_url); log("getMobileProvisioningUrl: mobile_provisioining_url from resource =" + url); } else { log("getMobileProvisioningUrl: mobile_provisioning_url from File =" + url); } // populate the iccid, imei and phone number in the provisioning url. if (!TextUtils.isEmpty(url)) { String phoneNumber = mTelephonyManager.getLine1Number(); if (TextUtils.isEmpty(phoneNumber)) { phoneNumber = "0000000000"; } url = String.format(url, mTelephonyManager.getSimSerialNumber() /* ICCID */, mTelephonyManager.getDeviceId() /* IMEI */, phoneNumber /* Phone number */); } return url; } @Override public void setProvisioningNotificationVisible(boolean visible, int networkType, String action) { enforceSettingsPermission(); if (!ConnectivityManager.isNetworkTypeValid(networkType)) { return; } final long ident = Binder.clearCallingIdentity(); try { // Concatenate the range of types onto the range of NetIDs. int id = NetIdManager.MAX_NET_ID + 1 + (networkType - ConnectivityManager.TYPE_NONE); mNotifier.setProvNotificationVisible(visible, id, action); } finally { Binder.restoreCallingIdentity(ident); } } @Override public void setAirplaneMode(boolean enable) { enforceAirplaneModePermission(); final long ident = Binder.clearCallingIdentity(); try { final ContentResolver cr = mContext.getContentResolver(); Settings.Global.putInt(cr, Settings.Global.AIRPLANE_MODE_ON, encodeBool(enable)); Intent intent = new Intent(Intent.ACTION_AIRPLANE_MODE_CHANGED); intent.putExtra("state", enable); mContext.sendBroadcastAsUser(intent, UserHandle.ALL); } finally { Binder.restoreCallingIdentity(ident); } } private void onUserStart(int userId) { synchronized (mVpns) { Vpn userVpn = mVpns.get(userId); if (userVpn != null) { loge("Starting user already has a VPN"); return; } userVpn = new Vpn(mHandler.getLooper(), mContext, mNMS, userId, mKeyStore); mVpns.put(userId, userVpn); if (mUserManager.getUserInfo(userId).isPrimary() && LockdownVpnTracker.isEnabled()) { updateLockdownVpn(); } } } private void onUserStop(int userId) { synchronized (mVpns) { Vpn userVpn = mVpns.get(userId); if (userVpn == null) { loge("Stopped user has no VPN"); return; } userVpn.onUserStopped(); mVpns.delete(userId); } } private void onUserAdded(int userId) { mPermissionMonitor.onUserAdded(userId); Network defaultNetwork = getNetwork(getDefaultNetwork()); synchronized (mVpns) { final int vpnsSize = mVpns.size(); for (int i = 0; i < vpnsSize; i++) { Vpn vpn = mVpns.valueAt(i); vpn.onUserAdded(userId); NetworkCapabilities nc = vpn.updateCapabilities(defaultNetwork); updateVpnCapabilities(vpn, nc); } } } private void onUserRemoved(int userId) { mPermissionMonitor.onUserRemoved(userId); Network defaultNetwork = getNetwork(getDefaultNetwork()); synchronized (mVpns) { final int vpnsSize = mVpns.size(); for (int i = 0; i < vpnsSize; i++) { Vpn vpn = mVpns.valueAt(i); vpn.onUserRemoved(userId); NetworkCapabilities nc = vpn.updateCapabilities(defaultNetwork); updateVpnCapabilities(vpn, nc); } } } private void onPackageAdded(String packageName, int uid) { if (TextUtils.isEmpty(packageName) || uid < 0) { Slog.wtf(TAG, "Invalid package in onPackageAdded: " + packageName + " | " + uid); return; } mPermissionMonitor.onPackageAdded(packageName, uid); } private void onPackageReplaced(String packageName, int uid) { if (TextUtils.isEmpty(packageName) || uid < 0) { Slog.wtf(TAG, "Invalid package in onPackageReplaced: " + packageName + " | " + uid); return; } final int userId = UserHandle.getUserId(uid); synchronized (mVpns) { final Vpn vpn = mVpns.get(userId); if (vpn == null) { return; } // Legacy always-on VPN won't be affected since the package name is not set. if (TextUtils.equals(vpn.getAlwaysOnPackage(), packageName)) { Slog.d(TAG, "Restarting always-on VPN package " + packageName + " for user " + userId); vpn.startAlwaysOnVpn(mKeyStore); } } } private void onPackageRemoved(String packageName, int uid, boolean isReplacing) { if (TextUtils.isEmpty(packageName) || uid < 0) { Slog.wtf(TAG, "Invalid package in onPackageRemoved: " + packageName + " | " + uid); return; } mPermissionMonitor.onPackageRemoved(uid); final int userId = UserHandle.getUserId(uid); synchronized (mVpns) { final Vpn vpn = mVpns.get(userId); if (vpn == null) { return; } // Legacy always-on VPN won't be affected since the package name is not set. if (TextUtils.equals(vpn.getAlwaysOnPackage(), packageName) && !isReplacing) { Slog.d(TAG, "Removing always-on VPN package " + packageName + " for user " + userId); vpn.setAlwaysOnPackage(null, false, null, mKeyStore); } } } private void onUserUnlocked(int userId) { synchronized (mVpns) { // User present may be sent because of an unlock, which might mean an unlocked keystore. if (mUserManager.getUserInfo(userId).isPrimary() && LockdownVpnTracker.isEnabled()) { updateLockdownVpn(); } else { startAlwaysOnVpn(userId); } } } private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { ensureRunningOnConnectivityServiceThread(); final String action = intent.getAction(); final int userId = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, UserHandle.USER_NULL); final int uid = intent.getIntExtra(Intent.EXTRA_UID, -1); final Uri packageData = intent.getData(); final String packageName = packageData != null ? packageData.getSchemeSpecificPart() : null; if (userId == UserHandle.USER_NULL) return; if (Intent.ACTION_USER_STARTED.equals(action)) { onUserStart(userId); } else if (Intent.ACTION_USER_STOPPED.equals(action)) { onUserStop(userId); } else if (Intent.ACTION_USER_ADDED.equals(action)) { onUserAdded(userId); } else if (Intent.ACTION_USER_REMOVED.equals(action)) { onUserRemoved(userId); } else if (Intent.ACTION_USER_UNLOCKED.equals(action)) { onUserUnlocked(userId); } else if (Intent.ACTION_PACKAGE_ADDED.equals(action)) { onPackageAdded(packageName, uid); } else if (Intent.ACTION_PACKAGE_REPLACED.equals(action)) { onPackageReplaced(packageName, uid); } else if (Intent.ACTION_PACKAGE_REMOVED.equals(action)) { final boolean isReplacing = intent.getBooleanExtra( Intent.EXTRA_REPLACING, false); onPackageRemoved(packageName, uid, isReplacing); } } }; private BroadcastReceiver mUserPresentReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { // Try creating lockdown tracker, since user present usually means // unlocked keystore. updateLockdownVpn(); mContext.unregisterReceiver(this); } }; private final HashMap mNetworkProviderInfos = new HashMap<>(); private final HashMap mNetworkRequests = new HashMap<>(); private static final int MAX_NETWORK_REQUESTS_PER_UID = 100; // Map from UID to number of NetworkRequests that UID has filed. @GuardedBy("mUidToNetworkRequestCount") private final SparseIntArray mUidToNetworkRequestCount = new SparseIntArray(); private static class NetworkProviderInfo { public final String name; public final Messenger messenger; private final AsyncChannel mAsyncChannel; private final IBinder.DeathRecipient mDeathRecipient; public final int providerId; NetworkProviderInfo(String name, Messenger messenger, AsyncChannel asyncChannel, int providerId, IBinder.DeathRecipient deathRecipient) { this.name = name; this.messenger = messenger; this.providerId = providerId; mAsyncChannel = asyncChannel; mDeathRecipient = deathRecipient; if ((mAsyncChannel == null) == (mDeathRecipient == null)) { throw new AssertionError("Must pass exactly one of asyncChannel or deathRecipient"); } } boolean isLegacyNetworkFactory() { return mAsyncChannel != null; } void sendMessageToNetworkProvider(int what, int arg1, int arg2, Object obj) { try { messenger.send(Message.obtain(null /* handler */, what, arg1, arg2, obj)); } catch (RemoteException e) { // Remote process died. Ignore; the death recipient will remove this // NetworkProviderInfo from mNetworkProviderInfos. } } void requestNetwork(NetworkRequest request, int score, int servingProviderId) { if (isLegacyNetworkFactory()) { mAsyncChannel.sendMessage(android.net.NetworkFactory.CMD_REQUEST_NETWORK, score, servingProviderId, request); } else { sendMessageToNetworkProvider(NetworkProvider.CMD_REQUEST_NETWORK, score, servingProviderId, request); } } void cancelRequest(NetworkRequest request) { if (isLegacyNetworkFactory()) { mAsyncChannel.sendMessage(android.net.NetworkFactory.CMD_CANCEL_REQUEST, request); } else { sendMessageToNetworkProvider(NetworkProvider.CMD_CANCEL_REQUEST, 0, 0, request); } } void connect(Context context, Handler handler) { if (isLegacyNetworkFactory()) { mAsyncChannel.connect(context, handler, messenger); } else { try { messenger.getBinder().linkToDeath(mDeathRecipient, 0); } catch (RemoteException e) { mDeathRecipient.binderDied(); } } } void completeConnection() { if (isLegacyNetworkFactory()) { mAsyncChannel.sendMessage(AsyncChannel.CMD_CHANNEL_FULL_CONNECTION); } } } private void ensureNetworkRequestHasType(NetworkRequest request) { if (request.type == NetworkRequest.Type.NONE) { throw new IllegalArgumentException( "All NetworkRequests in ConnectivityService must have a type"); } } /** * Tracks info about the requester. * Also used to notice when the calling process dies so we can self-expire */ private class NetworkRequestInfo implements IBinder.DeathRecipient { final NetworkRequest request; // The network currently satisfying this request, or null if none. Must only be touched // on the handler thread. This only makes sense for network requests and not for listens, // as defined by NetworkRequest#isRequest(). For listens, this is always null. @Nullable NetworkAgentInfo mSatisfier; final PendingIntent mPendingIntent; boolean mPendingIntentSent; private final IBinder mBinder; final int mPid; final int mUid; final Messenger messenger; NetworkRequestInfo(NetworkRequest r, PendingIntent pi) { request = r; ensureNetworkRequestHasType(request); mPendingIntent = pi; messenger = null; mBinder = null; mPid = getCallingPid(); mUid = getCallingUid(); enforceRequestCountLimit(); } NetworkRequestInfo(Messenger m, NetworkRequest r, IBinder binder) { super(); messenger = m; request = r; ensureNetworkRequestHasType(request); mBinder = binder; mPid = getCallingPid(); mUid = getCallingUid(); mPendingIntent = null; enforceRequestCountLimit(); try { mBinder.linkToDeath(this, 0); } catch (RemoteException e) { binderDied(); } } NetworkRequestInfo(NetworkRequest r) { this(r, null); } private void enforceRequestCountLimit() { synchronized (mUidToNetworkRequestCount) { int networkRequests = mUidToNetworkRequestCount.get(mUid, 0) + 1; if (networkRequests >= MAX_NETWORK_REQUESTS_PER_UID) { throw new ServiceSpecificException( ConnectivityManager.Errors.TOO_MANY_REQUESTS); } mUidToNetworkRequestCount.put(mUid, networkRequests); } } void unlinkDeathRecipient() { if (mBinder != null) { mBinder.unlinkToDeath(this, 0); } } public void binderDied() { log("ConnectivityService NetworkRequestInfo binderDied(" + request + ", " + mBinder + ")"); releaseNetworkRequest(request); } public String toString() { return "uid/pid:" + mUid + "/" + mPid + " " + request + (mPendingIntent == null ? "" : " to trigger " + mPendingIntent); } } private void ensureRequestableCapabilities(NetworkCapabilities networkCapabilities) { final String badCapability = networkCapabilities.describeFirstNonRequestableCapability(); if (badCapability != null) { throw new IllegalArgumentException("Cannot request network with " + badCapability); } } // This checks that the passed capabilities either do not request a // specific SSID/SignalStrength, or the calling app has permission to do so. private void ensureSufficientPermissionsForRequest(NetworkCapabilities nc, int callerPid, int callerUid, String callerPackageName) { if (null != nc.getSsid() && !checkSettingsPermission(callerPid, callerUid)) { throw new SecurityException("Insufficient permissions to request a specific SSID"); } if (nc.hasSignalStrength() && !checkNetworkSignalStrengthWakeupPermission(callerPid, callerUid)) { throw new SecurityException( "Insufficient permissions to request a specific signal strength"); } mAppOpsManager.checkPackage(callerUid, callerPackageName); } private ArrayList getSignalStrengthThresholds(NetworkAgentInfo nai) { final SortedSet thresholds = new TreeSet<>(); synchronized (nai) { for (NetworkRequestInfo nri : mNetworkRequests.values()) { if (nri.request.networkCapabilities.hasSignalStrength() && nai.satisfiesImmutableCapabilitiesOf(nri.request)) { thresholds.add(nri.request.networkCapabilities.getSignalStrength()); } } } return new ArrayList<>(thresholds); } private void updateSignalStrengthThresholds( NetworkAgentInfo nai, String reason, NetworkRequest request) { ArrayList thresholdsArray = getSignalStrengthThresholds(nai); Bundle thresholds = new Bundle(); thresholds.putIntegerArrayList("thresholds", thresholdsArray); if (VDBG || (DBG && !"CONNECT".equals(reason))) { String detail; if (request != null && request.networkCapabilities.hasSignalStrength()) { detail = reason + " " + request.networkCapabilities.getSignalStrength(); } else { detail = reason; } log(String.format("updateSignalStrengthThresholds: %s, sending %s to %s", detail, Arrays.toString(thresholdsArray.toArray()), nai.toShortString())); } nai.asyncChannel.sendMessage( android.net.NetworkAgent.CMD_SET_SIGNAL_STRENGTH_THRESHOLDS, 0, 0, thresholds); } private void ensureValidNetworkSpecifier(NetworkCapabilities nc) { if (nc == null) { return; } NetworkSpecifier ns = nc.getNetworkSpecifier(); if (ns == null) { return; } MatchAllNetworkSpecifier.checkNotMatchAllNetworkSpecifier(ns); } private void ensureValid(NetworkCapabilities nc) { ensureValidNetworkSpecifier(nc); if (nc.isPrivateDnsBroken()) { throw new IllegalArgumentException("Can't request broken private DNS"); } } private boolean checkUnsupportedStartingFrom(int version, String callingPackageName) { final PackageManager pm = mContext.getPackageManager(); final int userId = UserHandle.getCallingUserId(); try { final int callingVersion = pm.getApplicationInfoAsUser( callingPackageName, 0 /* flags */, userId).targetSdkVersion; if (callingVersion < version) return false; } catch (PackageManager.NameNotFoundException e) { } return true; } @Override public NetworkRequest requestNetwork(NetworkCapabilities networkCapabilities, Messenger messenger, int timeoutMs, IBinder binder, int legacyType, @NonNull String callingPackageName) { if (legacyType != TYPE_NONE && !checkNetworkStackPermission()) { if (checkUnsupportedStartingFrom(Build.VERSION_CODES.M, callingPackageName)) { throw new SecurityException("Insufficient permissions to specify legacy type"); } } final int callingUid = Binder.getCallingUid(); final NetworkRequest.Type type = (networkCapabilities == null) ? NetworkRequest.Type.TRACK_DEFAULT : NetworkRequest.Type.REQUEST; // If the requested networkCapabilities is null, take them instead from // the default network request. This allows callers to keep track of // the system default network. if (type == NetworkRequest.Type.TRACK_DEFAULT) { networkCapabilities = createDefaultNetworkCapabilitiesForUid(callingUid); enforceAccessPermission(); } else { networkCapabilities = new NetworkCapabilities(networkCapabilities); enforceNetworkRequestPermissions(networkCapabilities); // TODO: this is incorrect. We mark the request as metered or not depending on the state // of the app when the request is filed, but we never change the request if the app // changes network state. http://b/29964605 enforceMeteredApnPolicy(networkCapabilities); } ensureRequestableCapabilities(networkCapabilities); ensureSufficientPermissionsForRequest(networkCapabilities, Binder.getCallingPid(), callingUid, callingPackageName); // Set the UID range for this request to the single UID of the requester, or to an empty // set of UIDs if the caller has the appropriate permission and UIDs have not been set. // This will overwrite any allowed UIDs in the requested capabilities. Though there // are no visible methods to set the UIDs, an app could use reflection to try and get // networks for other apps so it's essential that the UIDs are overwritten. restrictRequestUidsForCallerAndSetRequestorInfo(networkCapabilities, callingUid, callingPackageName); if (timeoutMs < 0) { throw new IllegalArgumentException("Bad timeout specified"); } ensureValid(networkCapabilities); NetworkRequest networkRequest = new NetworkRequest(networkCapabilities, legacyType, nextNetworkRequestId(), type); NetworkRequestInfo nri = new NetworkRequestInfo(messenger, networkRequest, binder); if (DBG) log("requestNetwork for " + nri); mHandler.sendMessage(mHandler.obtainMessage(EVENT_REGISTER_NETWORK_REQUEST, nri)); if (timeoutMs > 0) { mHandler.sendMessageDelayed(mHandler.obtainMessage(EVENT_TIMEOUT_NETWORK_REQUEST, nri), timeoutMs); } return networkRequest; } private void enforceNetworkRequestPermissions(NetworkCapabilities networkCapabilities) { if (networkCapabilities.hasCapability(NET_CAPABILITY_NOT_RESTRICTED) == false) { enforceConnectivityRestrictedNetworksPermission(); } else { enforceChangePermission(); } } @Override public boolean requestBandwidthUpdate(Network network) { enforceAccessPermission(); NetworkAgentInfo nai = null; if (network == null) { return false; } synchronized (mNetworkForNetId) { nai = mNetworkForNetId.get(network.netId); } if (nai != null) { nai.asyncChannel.sendMessage(android.net.NetworkAgent.CMD_REQUEST_BANDWIDTH_UPDATE); synchronized (mBandwidthRequests) { final int uid = Binder.getCallingUid(); Integer uidReqs = mBandwidthRequests.get(uid); if (uidReqs == null) { uidReqs = 0; } mBandwidthRequests.put(uid, ++uidReqs); } return true; } return false; } private boolean isSystem(int uid) { return uid < Process.FIRST_APPLICATION_UID; } private void enforceMeteredApnPolicy(NetworkCapabilities networkCapabilities) { final int uid = Binder.getCallingUid(); if (isSystem(uid)) { // Exemption for system uid. return; } if (networkCapabilities.hasCapability(NET_CAPABILITY_NOT_METERED)) { // Policy already enforced. return; } if (mPolicyManagerInternal.isUidRestrictedOnMeteredNetworks(uid)) { // If UID is restricted, don't allow them to bring up metered APNs. networkCapabilities.addCapability(NET_CAPABILITY_NOT_METERED); } } @Override public NetworkRequest pendingRequestForNetwork(NetworkCapabilities networkCapabilities, PendingIntent operation, @NonNull String callingPackageName) { Objects.requireNonNull(operation, "PendingIntent cannot be null."); final int callingUid = Binder.getCallingUid(); networkCapabilities = new NetworkCapabilities(networkCapabilities); enforceNetworkRequestPermissions(networkCapabilities); enforceMeteredApnPolicy(networkCapabilities); ensureRequestableCapabilities(networkCapabilities); ensureSufficientPermissionsForRequest(networkCapabilities, Binder.getCallingPid(), callingUid, callingPackageName); ensureValidNetworkSpecifier(networkCapabilities); restrictRequestUidsForCallerAndSetRequestorInfo(networkCapabilities, callingUid, callingPackageName); NetworkRequest networkRequest = new NetworkRequest(networkCapabilities, TYPE_NONE, nextNetworkRequestId(), NetworkRequest.Type.REQUEST); NetworkRequestInfo nri = new NetworkRequestInfo(networkRequest, operation); if (DBG) log("pendingRequest for " + nri); mHandler.sendMessage(mHandler.obtainMessage(EVENT_REGISTER_NETWORK_REQUEST_WITH_INTENT, nri)); return networkRequest; } private void releasePendingNetworkRequestWithDelay(PendingIntent operation) { mHandler.sendMessageDelayed( mHandler.obtainMessage(EVENT_RELEASE_NETWORK_REQUEST_WITH_INTENT, getCallingUid(), 0, operation), mReleasePendingIntentDelayMs); } @Override public void releasePendingNetworkRequest(PendingIntent operation) { Objects.requireNonNull(operation, "PendingIntent cannot be null."); mHandler.sendMessage(mHandler.obtainMessage(EVENT_RELEASE_NETWORK_REQUEST_WITH_INTENT, getCallingUid(), 0, operation)); } // In order to implement the compatibility measure for pre-M apps that call // WifiManager.enableNetwork(..., true) without also binding to that network explicitly, // WifiManager registers a network listen for the purpose of calling setProcessDefaultNetwork. // This ensures it has permission to do so. private boolean hasWifiNetworkListenPermission(NetworkCapabilities nc) { if (nc == null) { return false; } int[] transportTypes = nc.getTransportTypes(); if (transportTypes.length != 1 || transportTypes[0] != NetworkCapabilities.TRANSPORT_WIFI) { return false; } try { mContext.enforceCallingOrSelfPermission( android.Manifest.permission.ACCESS_WIFI_STATE, "ConnectivityService"); } catch (SecurityException e) { return false; } return true; } @Override public NetworkRequest listenForNetwork(NetworkCapabilities networkCapabilities, Messenger messenger, IBinder binder, @NonNull String callingPackageName) { final int callingUid = Binder.getCallingUid(); if (!hasWifiNetworkListenPermission(networkCapabilities)) { enforceAccessPermission(); } NetworkCapabilities nc = new NetworkCapabilities(networkCapabilities); ensureSufficientPermissionsForRequest(networkCapabilities, Binder.getCallingPid(), callingUid, callingPackageName); restrictRequestUidsForCallerAndSetRequestorInfo(nc, callingUid, callingPackageName); // Apps without the CHANGE_NETWORK_STATE permission can't use background networks, so // make all their listens include NET_CAPABILITY_FOREGROUND. That way, they will get // onLost and onAvailable callbacks when networks move in and out of the background. // There is no need to do this for requests because an app without CHANGE_NETWORK_STATE // can't request networks. restrictBackgroundRequestForCaller(nc); ensureValid(nc); NetworkRequest networkRequest = new NetworkRequest(nc, TYPE_NONE, nextNetworkRequestId(), NetworkRequest.Type.LISTEN); NetworkRequestInfo nri = new NetworkRequestInfo(messenger, networkRequest, binder); if (VDBG) log("listenForNetwork for " + nri); mHandler.sendMessage(mHandler.obtainMessage(EVENT_REGISTER_NETWORK_LISTENER, nri)); return networkRequest; } @Override public void pendingListenForNetwork(NetworkCapabilities networkCapabilities, PendingIntent operation, @NonNull String callingPackageName) { Objects.requireNonNull(operation, "PendingIntent cannot be null."); final int callingUid = Binder.getCallingUid(); if (!hasWifiNetworkListenPermission(networkCapabilities)) { enforceAccessPermission(); } ensureValid(networkCapabilities); ensureSufficientPermissionsForRequest(networkCapabilities, Binder.getCallingPid(), callingUid, callingPackageName); final NetworkCapabilities nc = new NetworkCapabilities(networkCapabilities); restrictRequestUidsForCallerAndSetRequestorInfo(nc, callingUid, callingPackageName); NetworkRequest networkRequest = new NetworkRequest(nc, TYPE_NONE, nextNetworkRequestId(), NetworkRequest.Type.LISTEN); NetworkRequestInfo nri = new NetworkRequestInfo(networkRequest, operation); if (VDBG) log("pendingListenForNetwork for " + nri); mHandler.sendMessage(mHandler.obtainMessage(EVENT_REGISTER_NETWORK_LISTENER, nri)); } /** Returns the next Network provider ID. */ public final int nextNetworkProviderId() { return mNextNetworkProviderId.getAndIncrement(); } @Override public void releaseNetworkRequest(NetworkRequest networkRequest) { ensureNetworkRequestHasType(networkRequest); mHandler.sendMessage(mHandler.obtainMessage( EVENT_RELEASE_NETWORK_REQUEST, getCallingUid(), 0, networkRequest)); } @Override public int registerNetworkFactory(Messenger messenger, String name) { enforceNetworkFactoryPermission(); NetworkProviderInfo npi = new NetworkProviderInfo(name, messenger, new AsyncChannel(), nextNetworkProviderId(), null /* deathRecipient */); mHandler.sendMessage(mHandler.obtainMessage(EVENT_REGISTER_NETWORK_PROVIDER, npi)); return npi.providerId; } private void handleRegisterNetworkProvider(NetworkProviderInfo npi) { if (mNetworkProviderInfos.containsKey(npi.messenger)) { // Avoid creating duplicates. even if an app makes a direct AIDL call. // This will never happen if an app calls ConnectivityManager#registerNetworkProvider, // as that will throw if a duplicate provider is registered. Slog.e(TAG, "Attempt to register existing NetworkProviderInfo " + mNetworkProviderInfos.get(npi.messenger).name); return; } if (DBG) log("Got NetworkProvider Messenger for " + npi.name); mNetworkProviderInfos.put(npi.messenger, npi); npi.connect(mContext, mTrackerHandler); if (!npi.isLegacyNetworkFactory()) { // Legacy NetworkFactories get their requests when their AsyncChannel connects. sendAllRequestsToProvider(npi); } } @Override public int registerNetworkProvider(Messenger messenger, String name) { enforceNetworkFactoryOrSettingsPermission(); NetworkProviderInfo npi = new NetworkProviderInfo(name, messenger, null /* asyncChannel */, nextNetworkProviderId(), () -> unregisterNetworkProvider(messenger)); mHandler.sendMessage(mHandler.obtainMessage(EVENT_REGISTER_NETWORK_PROVIDER, npi)); return npi.providerId; } @Override public void unregisterNetworkProvider(Messenger messenger) { enforceNetworkFactoryOrSettingsPermission(); mHandler.sendMessage(mHandler.obtainMessage(EVENT_UNREGISTER_NETWORK_PROVIDER, messenger)); } @Override public void unregisterNetworkFactory(Messenger messenger) { unregisterNetworkProvider(messenger); } private void handleUnregisterNetworkProvider(Messenger messenger) { NetworkProviderInfo npi = mNetworkProviderInfos.remove(messenger); if (npi == null) { loge("Failed to find Messenger in unregisterNetworkProvider"); return; } if (DBG) log("unregisterNetworkProvider for " + npi.name); } @Override public void declareNetworkRequestUnfulfillable(NetworkRequest request) { if (request.hasTransport(TRANSPORT_TEST)) { enforceNetworkFactoryOrTestNetworksPermission(); } else { enforceNetworkFactoryPermission(); } mHandler.post(() -> handleReleaseNetworkRequest(request, Binder.getCallingUid(), true)); } // NOTE: Accessed on multiple threads, must be synchronized on itself. @GuardedBy("mNetworkForNetId") private final SparseArray mNetworkForNetId = new SparseArray<>(); // NOTE: Accessed on multiple threads, synchronized with mNetworkForNetId. // An entry is first reserved with NetIdManager, prior to being added to mNetworkForNetId, so // there may not be a strict 1:1 correlation between the two. private final NetIdManager mNetIdManager; // NetworkAgentInfo keyed off its connecting messenger // TODO - eval if we can reduce the number of lists/hashmaps/sparsearrays // NOTE: Only should be accessed on ConnectivityServiceThread, except dump(). private final HashMap mNetworkAgentInfos = new HashMap<>(); @GuardedBy("mBlockedAppUids") private final HashSet mBlockedAppUids = new HashSet<>(); // Note: if mDefaultRequest is changed, NetworkMonitor needs to be updated. @NonNull private final NetworkRequest mDefaultRequest; // The NetworkAgentInfo currently satisfying the default request, if any. @Nullable private volatile NetworkAgentInfo mDefaultNetworkNai = null; // Request used to optionally keep mobile data active even when higher // priority networks like Wi-Fi are active. private final NetworkRequest mDefaultMobileDataRequest; // Request used to optionally keep wifi data active even when higher // priority networks like ethernet are active. private final NetworkRequest mDefaultWifiRequest; private NetworkAgentInfo getDefaultNetwork() { return mDefaultNetworkNai; } @Nullable private Network getNetwork(@Nullable NetworkAgentInfo nai) { return nai != null ? nai.network : null; } private void ensureRunningOnConnectivityServiceThread() { if (mHandler.getLooper().getThread() != Thread.currentThread()) { throw new IllegalStateException( "Not running on ConnectivityService thread: " + Thread.currentThread().getName()); } } @VisibleForTesting protected boolean isDefaultNetwork(NetworkAgentInfo nai) { return nai == getDefaultNetwork(); } private boolean isDefaultRequest(NetworkRequestInfo nri) { return nri.request.requestId == mDefaultRequest.requestId; } // TODO : remove this method. It's a stopgap measure to help sheperding a number of dependent // changes that would conflict throughout the automerger graph. Having this method temporarily // helps with the process of going through with all these dependent changes across the entire // tree. /** * Register a new agent. {@see #registerNetworkAgent} below. */ public Network registerNetworkAgent(Messenger messenger, NetworkInfo networkInfo, LinkProperties linkProperties, NetworkCapabilities networkCapabilities, int currentScore, NetworkAgentConfig networkAgentConfig) { return registerNetworkAgent(messenger, networkInfo, linkProperties, networkCapabilities, currentScore, networkAgentConfig, NetworkProvider.ID_NONE); } /** * Register a new agent with ConnectivityService to handle a network. * * @param messenger a messenger for ConnectivityService to contact the agent asynchronously. * @param networkInfo the initial info associated with this network. It can be updated later : * see {@link #updateNetworkInfo}. * @param linkProperties the initial link properties of this network. They can be updated * later : see {@link #updateLinkProperties}. * @param networkCapabilities the initial capabilites of this network. They can be updated * later : see {@link #updateCapabilities}. * @param currentScore the initial score of the network. See * {@link NetworkAgentInfo#getCurrentScore}. * @param networkAgentConfig metadata about the network. This is never updated. * @param providerId the ID of the provider owning this NetworkAgent. * @return the network created for this agent. */ public Network registerNetworkAgent(Messenger messenger, NetworkInfo networkInfo, LinkProperties linkProperties, NetworkCapabilities networkCapabilities, int currentScore, NetworkAgentConfig networkAgentConfig, int providerId) { if (networkCapabilities.hasTransport(TRANSPORT_TEST)) { enforceAnyPermissionOf(Manifest.permission.MANAGE_TEST_NETWORKS); // Strictly, sanitizing here is unnecessary as the capabilities will be sanitized in // the call to mixInCapabilities below anyway, but sanitizing here means the NAI never // sees capabilities that may be malicious, which might prevent mistakes in the future. networkCapabilities = new NetworkCapabilities(networkCapabilities); networkCapabilities.restrictCapabilitesForTestNetwork(Binder.getCallingUid()); } else { enforceNetworkFactoryPermission(); } LinkProperties lp = new LinkProperties(linkProperties); // TODO: Instead of passing mDefaultRequest, provide an API to determine whether a Network // satisfies mDefaultRequest. final NetworkCapabilities nc = new NetworkCapabilities(networkCapabilities); final NetworkAgentInfo nai = new NetworkAgentInfo(messenger, new AsyncChannel(), new Network(mNetIdManager.reserveNetId()), new NetworkInfo(networkInfo), lp, nc, currentScore, mContext, mTrackerHandler, new NetworkAgentConfig(networkAgentConfig), this, mNetd, mDnsResolver, mNMS, providerId, Binder.getCallingUid()); // Make sure the LinkProperties and NetworkCapabilities reflect what the agent info says. nai.getAndSetNetworkCapabilities(mixInCapabilities(nai, nc)); processLinkPropertiesFromAgent(nai, nai.linkProperties); final String extraInfo = networkInfo.getExtraInfo(); final String name = TextUtils.isEmpty(extraInfo) ? nai.networkCapabilities.getSsid() : extraInfo; if (DBG) log("registerNetworkAgent " + nai); final long token = Binder.clearCallingIdentity(); try { mDeps.getNetworkStack().makeNetworkMonitor( nai.network, name, new NetworkMonitorCallbacks(nai)); } finally { Binder.restoreCallingIdentity(token); } // NetworkAgentInfo registration will finish when the NetworkMonitor is created. // If the network disconnects or sends any other event before that, messages are deferred by // NetworkAgent until nai.asyncChannel.connect(), which will be called when finalizing the // registration. return nai.network; } private void handleRegisterNetworkAgent(NetworkAgentInfo nai, INetworkMonitor networkMonitor) { nai.onNetworkMonitorCreated(networkMonitor); if (VDBG) log("Got NetworkAgent Messenger"); mNetworkAgentInfos.put(nai.messenger, nai); synchronized (mNetworkForNetId) { mNetworkForNetId.put(nai.network.netId, nai); } try { networkMonitor.start(); } catch (RemoteException e) { e.rethrowAsRuntimeException(); } nai.asyncChannel.connect(mContext, mTrackerHandler, nai.messenger); NetworkInfo networkInfo = nai.networkInfo; updateNetworkInfo(nai, networkInfo); updateUids(nai, null, nai.networkCapabilities); } private void processLinkPropertiesFromAgent(NetworkAgentInfo nai, LinkProperties lp) { lp.ensureDirectlyConnectedRoutes(); nai.clatd.setNat64PrefixFromRa(lp.getNat64Prefix()); } private void updateLinkProperties(NetworkAgentInfo networkAgent, LinkProperties newLp, @NonNull LinkProperties oldLp) { int netId = networkAgent.network.netId; // The NetworkAgent does not know whether clatd is running on its network or not, or whether // a NAT64 prefix was discovered by the DNS resolver. Before we do anything else, make sure // the LinkProperties for the network are accurate. networkAgent.clatd.fixupLinkProperties(oldLp, newLp); updateInterfaces(newLp, oldLp, netId, networkAgent.networkCapabilities, networkAgent.networkInfo.getType()); // update filtering rules, need to happen after the interface update so netd knows about the // new interface (the interface name -> index map becomes initialized) updateVpnFiltering(newLp, oldLp, networkAgent); updateMtu(newLp, oldLp); // TODO - figure out what to do for clat // for (LinkProperties lp : newLp.getStackedLinks()) { // updateMtu(lp, null); // } if (isDefaultNetwork(networkAgent)) { updateTcpBufferSizes(newLp.getTcpBufferSizes()); } updateRoutes(newLp, oldLp, netId); updateDnses(newLp, oldLp, netId); // Make sure LinkProperties represents the latest private DNS status. // This does not need to be done before updateDnses because the // LinkProperties are not the source of the private DNS configuration. // updateDnses will fetch the private DNS configuration from DnsManager. mDnsManager.updatePrivateDnsStatus(netId, newLp); if (isDefaultNetwork(networkAgent)) { handleApplyDefaultProxy(newLp.getHttpProxy()); } else { updateProxy(newLp, oldLp); } updateWakeOnLan(newLp); // Captive portal data is obtained from NetworkMonitor and stored in NetworkAgentInfo, // it is not contained in LinkProperties sent from NetworkAgents so needs to be merged here. newLp.setCaptivePortalData(networkAgent.captivePortalData); // TODO - move this check to cover the whole function if (!Objects.equals(newLp, oldLp)) { synchronized (networkAgent) { networkAgent.linkProperties = newLp; } // Start or stop DNS64 detection and 464xlat according to network state. networkAgent.clatd.update(); notifyIfacesChangedForNetworkStats(); networkAgent.networkMonitor().notifyLinkPropertiesChanged( new LinkProperties(newLp, true /* parcelSensitiveFields */)); if (networkAgent.everConnected) { notifyNetworkCallbacks(networkAgent, ConnectivityManager.CALLBACK_IP_CHANGED); } } mKeepaliveTracker.handleCheckKeepalivesStillValid(networkAgent); } private void wakeupModifyInterface(String iface, NetworkCapabilities caps, boolean add) { // Marks are only available on WiFi interfaces. Checking for // marks on unsupported interfaces is harmless. if (!caps.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) { return; } int mark = mContext.getResources().getInteger( com.android.internal.R.integer.config_networkWakeupPacketMark); int mask = mContext.getResources().getInteger( com.android.internal.R.integer.config_networkWakeupPacketMask); // Mask/mark of zero will not detect anything interesting. // Don't install rules unless both values are nonzero. if (mark == 0 || mask == 0) { return; } final String prefix = "iface:" + iface; try { if (add) { mNetd.wakeupAddInterface(iface, prefix, mark, mask); } else { mNetd.wakeupDelInterface(iface, prefix, mark, mask); } } catch (Exception e) { loge("Exception modifying wakeup packet monitoring: " + e); } } private void updateInterfaces(final @Nullable LinkProperties newLp, final @Nullable LinkProperties oldLp, final int netId, final @Nullable NetworkCapabilities caps, final int legacyType) { final CompareResult interfaceDiff = new CompareResult<>( oldLp != null ? oldLp.getAllInterfaceNames() : null, newLp != null ? newLp.getAllInterfaceNames() : null); if (!interfaceDiff.added.isEmpty()) { final IBatteryStats bs = mDeps.getBatteryStatsService(); for (final String iface : interfaceDiff.added) { try { if (DBG) log("Adding iface " + iface + " to network " + netId); mNMS.addInterfaceToNetwork(iface, netId); wakeupModifyInterface(iface, caps, true); bs.noteNetworkInterfaceType(iface, legacyType); } catch (Exception e) { loge("Exception adding interface: " + e); } } } for (final String iface : interfaceDiff.removed) { try { if (DBG) log("Removing iface " + iface + " from network " + netId); wakeupModifyInterface(iface, caps, false); mNMS.removeInterfaceFromNetwork(iface, netId); } catch (Exception e) { loge("Exception removing interface: " + e); } } } // TODO: move to frameworks/libs/net. private RouteInfoParcel convertRouteInfo(RouteInfo route) { final String nextHop; switch (route.getType()) { case RouteInfo.RTN_UNICAST: if (route.hasGateway()) { nextHop = route.getGateway().getHostAddress(); } else { nextHop = INetd.NEXTHOP_NONE; } break; case RouteInfo.RTN_UNREACHABLE: nextHop = INetd.NEXTHOP_UNREACHABLE; break; case RouteInfo.RTN_THROW: nextHop = INetd.NEXTHOP_THROW; break; default: nextHop = INetd.NEXTHOP_NONE; break; } final RouteInfoParcel rip = new RouteInfoParcel(); rip.ifName = route.getInterface(); rip.destination = route.getDestination().toString(); rip.nextHop = nextHop; rip.mtu = route.getMtu(); return rip; } /** * Have netd update routes from oldLp to newLp. * @return true if routes changed between oldLp and newLp */ private boolean updateRoutes(LinkProperties newLp, LinkProperties oldLp, int netId) { // compare the route diff to determine which routes have been updated final CompareOrUpdateResult routeDiff = new CompareOrUpdateResult<>( oldLp != null ? oldLp.getAllRoutes() : null, newLp != null ? newLp.getAllRoutes() : null, (r) -> r.getRouteKey()); // add routes before removing old in case it helps with continuous connectivity // do this twice, adding non-next-hop routes first, then routes they are dependent on for (RouteInfo route : routeDiff.added) { if (route.hasGateway()) continue; if (VDBG || DDBG) log("Adding Route [" + route + "] to network " + netId); try { mNetd.networkAddRouteParcel(netId, convertRouteInfo(route)); } catch (Exception e) { if ((route.getDestination().getAddress() instanceof Inet4Address) || VDBG) { loge("Exception in networkAddRouteParcel for non-gateway: " + e); } } } for (RouteInfo route : routeDiff.added) { if (!route.hasGateway()) continue; if (VDBG || DDBG) log("Adding Route [" + route + "] to network " + netId); try { mNetd.networkAddRouteParcel(netId, convertRouteInfo(route)); } catch (Exception e) { if ((route.getGateway() instanceof Inet4Address) || VDBG) { loge("Exception in networkAddRouteParcel for gateway: " + e); } } } for (RouteInfo route : routeDiff.removed) { if (VDBG || DDBG) log("Removing Route [" + route + "] from network " + netId); try { mNetd.networkRemoveRouteParcel(netId, convertRouteInfo(route)); } catch (Exception e) { loge("Exception in networkRemoveRouteParcel: " + e); } } for (RouteInfo route : routeDiff.updated) { if (VDBG || DDBG) log("Updating Route [" + route + "] from network " + netId); try { mNetd.networkUpdateRouteParcel(netId, convertRouteInfo(route)); } catch (Exception e) { loge("Exception in networkUpdateRouteParcel: " + e); } } return !routeDiff.added.isEmpty() || !routeDiff.removed.isEmpty() || !routeDiff.updated.isEmpty(); } private void updateDnses(LinkProperties newLp, LinkProperties oldLp, int netId) { if (oldLp != null && newLp.isIdenticalDnses(oldLp)) { return; // no updating necessary } final NetworkAgentInfo defaultNai = getDefaultNetwork(); final boolean isDefaultNetwork = (defaultNai != null && defaultNai.network.netId == netId); if (DBG) { final Collection dnses = newLp.getDnsServers(); log("Setting DNS servers for network " + netId + " to " + dnses); } try { mDnsManager.noteDnsServersForNetwork(netId, newLp); // TODO: netd should listen on [::1]:53 and proxy queries to the current // default network, and we should just set net.dns1 to ::1, not least // because applications attempting to use net.dns resolvers will bypass // the privacy protections of things like DNS-over-TLS. if (isDefaultNetwork) mDnsManager.setDefaultDnsSystemProperties(newLp.getDnsServers()); mDnsManager.flushVmDnsCache(); } catch (Exception e) { loge("Exception in setDnsConfigurationForNetwork: " + e); } } private void updateVpnFiltering(LinkProperties newLp, LinkProperties oldLp, NetworkAgentInfo nai) { final String oldIface = oldLp != null ? oldLp.getInterfaceName() : null; final String newIface = newLp != null ? newLp.getInterfaceName() : null; final boolean wasFiltering = requiresVpnIsolation(nai, nai.networkCapabilities, oldLp); final boolean needsFiltering = requiresVpnIsolation(nai, nai.networkCapabilities, newLp); if (!wasFiltering && !needsFiltering) { // Nothing to do. return; } if (Objects.equals(oldIface, newIface) && (wasFiltering == needsFiltering)) { // Nothing changed. return; } final Set ranges = nai.networkCapabilities.getUids(); final int vpnAppUid = nai.networkCapabilities.getOwnerUid(); // TODO: this create a window of opportunity for apps to receive traffic between the time // when the old rules are removed and the time when new rules are added. To fix this, // make eBPF support two whitelisted interfaces so here new rules can be added before the // old rules are being removed. if (wasFiltering) { mPermissionMonitor.onVpnUidRangesRemoved(oldIface, ranges, vpnAppUid); } if (needsFiltering) { mPermissionMonitor.onVpnUidRangesAdded(newIface, ranges, vpnAppUid); } } private void updateWakeOnLan(@NonNull LinkProperties lp) { lp.setWakeOnLanSupported(mWolSupportedInterfaces.contains(lp.getInterfaceName())); } private int getNetworkPermission(NetworkCapabilities nc) { if (!nc.hasCapability(NET_CAPABILITY_NOT_RESTRICTED)) { return INetd.PERMISSION_SYSTEM; } if (!nc.hasCapability(NET_CAPABILITY_FOREGROUND)) { return INetd.PERMISSION_NETWORK; } return INetd.PERMISSION_NONE; } private void updateNetworkPermissions(@NonNull final NetworkAgentInfo nai, @NonNull final NetworkCapabilities newNc) { final int oldPermission = getNetworkPermission(nai.networkCapabilities); final int newPermission = getNetworkPermission(newNc); if (oldPermission != newPermission && nai.created && !nai.isVPN()) { try { mNMS.setNetworkPermission(nai.network.netId, newPermission); } catch (RemoteException e) { loge("Exception in setNetworkPermission: " + e); } } } /** * Augments the NetworkCapabilities passed in by a NetworkAgent with capabilities that are * maintained here that the NetworkAgent is not aware of (e.g., validated, captive portal, * and foreground status). */ private NetworkCapabilities mixInCapabilities(NetworkAgentInfo nai, NetworkCapabilities nc) { // Once a NetworkAgent is connected, complain if some immutable capabilities are removed. // Don't complain for VPNs since they're not driven by requests and there is no risk of // causing a connect/teardown loop. // TODO: remove this altogether and make it the responsibility of the NetworkProviders to // avoid connect/teardown loops. if (nai.everConnected && !nai.isVPN() && !nai.networkCapabilities.satisfiedByImmutableNetworkCapabilities(nc)) { // TODO: consider not complaining when a network agent degrades its capabilities if this // does not cause any request (that is not a listen) currently matching that agent to // stop being matched by the updated agent. String diff = nai.networkCapabilities.describeImmutableDifferences(nc); if (!TextUtils.isEmpty(diff)) { Slog.wtf(TAG, "BUG: " + nai + " lost immutable capabilities:" + diff); } } // Don't modify caller's NetworkCapabilities. NetworkCapabilities newNc = new NetworkCapabilities(nc); if (nai.lastValidated) { newNc.addCapability(NET_CAPABILITY_VALIDATED); } else { newNc.removeCapability(NET_CAPABILITY_VALIDATED); } if (nai.lastCaptivePortalDetected) { newNc.addCapability(NET_CAPABILITY_CAPTIVE_PORTAL); } else { newNc.removeCapability(NET_CAPABILITY_CAPTIVE_PORTAL); } if (nai.isBackgroundNetwork()) { newNc.removeCapability(NET_CAPABILITY_FOREGROUND); } else { newNc.addCapability(NET_CAPABILITY_FOREGROUND); } if (nai.partialConnectivity) { newNc.addCapability(NET_CAPABILITY_PARTIAL_CONNECTIVITY); } else { newNc.removeCapability(NET_CAPABILITY_PARTIAL_CONNECTIVITY); } newNc.setPrivateDnsBroken(nai.networkCapabilities.isPrivateDnsBroken()); // TODO : remove this once all factories are updated to send NOT_SUSPENDED and NOT_ROAMING if (!newNc.hasTransport(TRANSPORT_CELLULAR)) { newNc.addCapability(NET_CAPABILITY_NOT_SUSPENDED); newNc.addCapability(NET_CAPABILITY_NOT_ROAMING); } return newNc; } /** * Update the NetworkCapabilities for {@code nai} to {@code nc}. Specifically: * * 1. Calls mixInCapabilities to merge the passed-in NetworkCapabilities {@code nc} with the * capabilities we manage and store in {@code nai}, such as validated status and captive * portal status) * 2. Takes action on the result: changes network permissions, sends CAP_CHANGED callbacks, and * potentially triggers rematches. * 3. Directly informs other network stack components (NetworkStatsService, VPNs, etc. of the * change.) * * @param oldScore score of the network before any of the changes that prompted us * to call this function. * @param nai the network having its capabilities updated. * @param nc the new network capabilities. */ private void updateCapabilities(final int oldScore, @NonNull final NetworkAgentInfo nai, @NonNull final NetworkCapabilities nc) { NetworkCapabilities newNc = mixInCapabilities(nai, nc); if (Objects.equals(nai.networkCapabilities, newNc)) return; updateNetworkPermissions(nai, newNc); final NetworkCapabilities prevNc = nai.getAndSetNetworkCapabilities(newNc); updateUids(nai, prevNc, newNc); if (nai.getCurrentScore() == oldScore && newNc.equalRequestableCapabilities(prevNc)) { // If the requestable capabilities haven't changed, and the score hasn't changed, then // the change we're processing can't affect any requests, it can only affect the listens // on this network. We might have been called by rematchNetworkAndRequests when a // network changed foreground state. processListenRequests(nai); final boolean prevSuspended = !prevNc.hasCapability(NET_CAPABILITY_NOT_SUSPENDED); final boolean suspended = !newNc.hasCapability(NET_CAPABILITY_NOT_SUSPENDED); final boolean prevRoaming = !prevNc.hasCapability(NET_CAPABILITY_NOT_ROAMING); final boolean roaming = !newNc.hasCapability(NET_CAPABILITY_NOT_ROAMING); if (prevSuspended != suspended || prevRoaming != roaming) { // TODO (b/73132094) : remove this call once the few users of onSuspended and // onResumed have been removed. notifyNetworkCallbacks(nai, suspended ? ConnectivityManager.CALLBACK_SUSPENDED : ConnectivityManager.CALLBACK_RESUMED); // updateNetworkInfo will mix in the suspended info from the capabilities and // take appropriate action for the network having possibly changed state. updateNetworkInfo(nai, nai.networkInfo); } } else { // If the requestable capabilities have changed or the score changed, we can't have been // called by rematchNetworkAndRequests, so it's safe to start a rematch. rematchAllNetworksAndRequests(); notifyNetworkCallbacks(nai, ConnectivityManager.CALLBACK_CAP_CHANGED); } // TODO : static analysis indicates that prevNc can't be null here (getAndSetNetworkCaps // never returns null), so mark the relevant members and functions in nai as @NonNull and // remove this test if (prevNc != null) { final boolean oldMetered = prevNc.isMetered(); final boolean newMetered = newNc.isMetered(); final boolean meteredChanged = oldMetered != newMetered; if (meteredChanged) { maybeNotifyNetworkBlocked(nai, oldMetered, newMetered, mRestrictBackground, mRestrictBackground); } final boolean roamingChanged = prevNc.hasCapability(NET_CAPABILITY_NOT_ROAMING) != newNc.hasCapability(NET_CAPABILITY_NOT_ROAMING); // Report changes that are interesting for network statistics tracking. if (meteredChanged || roamingChanged) { notifyIfacesChangedForNetworkStats(); } } if (!newNc.hasTransport(TRANSPORT_VPN)) { // Tell VPNs about updated capabilities, since they may need to // bubble those changes through. updateAllVpnsCapabilities(); } if (!newNc.equalsTransportTypes(prevNc)) { mDnsManager.updateTransportsForNetwork(nai.network.netId, newNc.getTransportTypes()); } } /** * Returns whether VPN isolation (ingress interface filtering) should be applied on the given * network. * * Ingress interface filtering enforces that all apps under the given network can only receive * packets from the network's interface (and loopback). This is important for VPNs because * apps that cannot bypass a fully-routed VPN shouldn't be able to receive packets from any * non-VPN interfaces. * * As a result, this method should return true iff * 1. the network is an app VPN (not legacy VPN) * 2. the VPN does not allow bypass * 3. the VPN is fully-routed * 4. the VPN interface is non-null * * @see INetd#firewallAddUidInterfaceRules * @see INetd#firewallRemoveUidInterfaceRules */ private boolean requiresVpnIsolation(@NonNull NetworkAgentInfo nai, NetworkCapabilities nc, LinkProperties lp) { if (nc == null || lp == null) return false; return nai.isVPN() && !nai.networkAgentConfig.allowBypass && nc.getOwnerUid() != Process.SYSTEM_UID && lp.getInterfaceName() != null && (lp.hasIPv4DefaultRoute() || lp.hasIpv4UnreachableDefaultRoute()) && (lp.hasIPv6DefaultRoute() || lp.hasIpv6UnreachableDefaultRoute()); } private void updateUids(NetworkAgentInfo nai, NetworkCapabilities prevNc, NetworkCapabilities newNc) { Set prevRanges = null == prevNc ? null : prevNc.getUids(); Set newRanges = null == newNc ? null : newNc.getUids(); if (null == prevRanges) prevRanges = new ArraySet<>(); if (null == newRanges) newRanges = new ArraySet<>(); final Set prevRangesCopy = new ArraySet<>(prevRanges); prevRanges.removeAll(newRanges); newRanges.removeAll(prevRangesCopy); try { // When updating the VPN uid routing rules, add the new range first then remove the old // range. If old range were removed first, there would be a window between the old // range being removed and the new range being added, during which UIDs contained // in both ranges are not subject to any VPN routing rules. Adding new range before // removing old range works because, unlike the filtering rules below, it's possible to // add duplicate UID routing rules. if (!newRanges.isEmpty()) { final UidRange[] addedRangesArray = new UidRange[newRanges.size()]; newRanges.toArray(addedRangesArray); mNMS.addVpnUidRanges(nai.network.netId, addedRangesArray); } if (!prevRanges.isEmpty()) { final UidRange[] removedRangesArray = new UidRange[prevRanges.size()]; prevRanges.toArray(removedRangesArray); mNMS.removeVpnUidRanges(nai.network.netId, removedRangesArray); } final boolean wasFiltering = requiresVpnIsolation(nai, prevNc, nai.linkProperties); final boolean shouldFilter = requiresVpnIsolation(nai, newNc, nai.linkProperties); final String iface = nai.linkProperties.getInterfaceName(); // For VPN uid interface filtering, old ranges need to be removed before new ranges can // be added, due to the range being expanded and stored as individual UIDs. For example // the UIDs might be updated from [0, 99999] to ([0, 10012], [10014, 99999]) which means // prevRanges = [0, 99999] while newRanges = [0, 10012], [10014, 99999]. If prevRanges // were added first and then newRanges got removed later, there would be only one uid // 10013 left. A consequence of removing old ranges before adding new ranges is that // there is now a window of opportunity when the UIDs are not subject to any filtering. // Note that this is in contrast with the (more robust) update of VPN routing rules // above, where the addition of new ranges happens before the removal of old ranges. // TODO Fix this window by computing an accurate diff on Set, so the old range // to be removed will never overlap with the new range to be added. if (wasFiltering && !prevRanges.isEmpty()) { mPermissionMonitor.onVpnUidRangesRemoved(iface, prevRanges, prevNc.getOwnerUid()); } if (shouldFilter && !newRanges.isEmpty()) { mPermissionMonitor.onVpnUidRangesAdded(iface, newRanges, newNc.getOwnerUid()); } } catch (Exception e) { // Never crash! loge("Exception in updateUids: ", e); } } public void handleUpdateLinkProperties(NetworkAgentInfo nai, LinkProperties newLp) { ensureRunningOnConnectivityServiceThread(); if (getNetworkAgentInfoForNetId(nai.network.netId) != nai) { // Ignore updates for disconnected networks return; } if (VDBG || DDBG) { log("Update of LinkProperties for " + nai.toShortString() + "; created=" + nai.created + "; everConnected=" + nai.everConnected); } // TODO: eliminate this defensive copy after confirming that updateLinkProperties does not // modify its oldLp parameter. updateLinkProperties(nai, newLp, new LinkProperties(nai.linkProperties)); } private void sendUpdatedScoreToFactories(NetworkAgentInfo nai) { for (int i = 0; i < nai.numNetworkRequests(); i++) { NetworkRequest nr = nai.requestAt(i); // Don't send listening requests to factories. b/17393458 if (nr.isListen()) continue; sendUpdatedScoreToFactories(nr, nai); } } private void sendUpdatedScoreToFactories(@NonNull NetworkRequest networkRequest, @Nullable NetworkAgentInfo nai) { final int score; final int serial; if (nai != null) { score = nai.getCurrentScore(); serial = nai.factorySerialNumber; } else { score = 0; serial = 0; } if (VDBG || DDBG){ log("sending new Min Network Score(" + score + "): " + networkRequest.toString()); } for (NetworkProviderInfo npi : mNetworkProviderInfos.values()) { npi.requestNetwork(networkRequest, score, serial); } } /** Sends all current NetworkRequests to the specified factory. */ private void sendAllRequestsToProvider(NetworkProviderInfo npi) { ensureRunningOnConnectivityServiceThread(); for (NetworkRequestInfo nri : mNetworkRequests.values()) { if (nri.request.isListen()) continue; NetworkAgentInfo nai = nri.mSatisfier; final int score; final int serial; if (nai != null) { score = nai.getCurrentScore(); serial = nai.factorySerialNumber; } else { score = 0; serial = NetworkProvider.ID_NONE; } npi.requestNetwork(nri.request, score, serial); } } private void sendPendingIntentForRequest(NetworkRequestInfo nri, NetworkAgentInfo networkAgent, int notificationType) { if (notificationType == ConnectivityManager.CALLBACK_AVAILABLE && !nri.mPendingIntentSent) { Intent intent = new Intent(); intent.putExtra(ConnectivityManager.EXTRA_NETWORK, networkAgent.network); intent.putExtra(ConnectivityManager.EXTRA_NETWORK_REQUEST, nri.request); nri.mPendingIntentSent = true; sendIntent(nri.mPendingIntent, intent); } // else not handled } private void sendIntent(PendingIntent pendingIntent, Intent intent) { mPendingIntentWakeLock.acquire(); try { if (DBG) log("Sending " + pendingIntent); pendingIntent.send(mContext, 0, intent, this /* onFinished */, null /* Handler */); } catch (PendingIntent.CanceledException e) { if (DBG) log(pendingIntent + " was not sent, it had been canceled."); mPendingIntentWakeLock.release(); releasePendingNetworkRequest(pendingIntent); } // ...otherwise, mPendingIntentWakeLock.release() gets called by onSendFinished() } @Override public void onSendFinished(PendingIntent pendingIntent, Intent intent, int resultCode, String resultData, Bundle resultExtras) { if (DBG) log("Finished sending " + pendingIntent); mPendingIntentWakeLock.release(); // Release with a delay so the receiving client has an opportunity to put in its // own request. releasePendingNetworkRequestWithDelay(pendingIntent); } private void callCallbackForRequest(NetworkRequestInfo nri, NetworkAgentInfo networkAgent, int notificationType, int arg1) { if (nri.messenger == null) { // Default request has no msgr. Also prevents callbacks from being invoked for // NetworkRequestInfos registered with ConnectivityDiagnostics requests. Those callbacks // are Type.LISTEN, but should not have NetworkCallbacks invoked. return; } Bundle bundle = new Bundle(); // TODO: check if defensive copies of data is needed. putParcelable(bundle, new NetworkRequest(nri.request)); Message msg = Message.obtain(); if (notificationType != ConnectivityManager.CALLBACK_UNAVAIL) { putParcelable(bundle, networkAgent.network); } switch (notificationType) { case ConnectivityManager.CALLBACK_AVAILABLE: { final NetworkCapabilities nc = networkCapabilitiesRestrictedForCallerPermissions( networkAgent.networkCapabilities, nri.mPid, nri.mUid); putParcelable( bundle, maybeSanitizeLocationInfoForCaller( nc, nri.mUid, nri.request.getRequestorPackageName())); putParcelable(bundle, linkPropertiesRestrictedForCallerPermissions( networkAgent.linkProperties, nri.mPid, nri.mUid)); // For this notification, arg1 contains the blocked status. msg.arg1 = arg1; break; } case ConnectivityManager.CALLBACK_LOSING: { msg.arg1 = arg1; break; } case ConnectivityManager.CALLBACK_CAP_CHANGED: { // networkAgent can't be null as it has been accessed a few lines above. final NetworkCapabilities netCap = networkCapabilitiesRestrictedForCallerPermissions( networkAgent.networkCapabilities, nri.mPid, nri.mUid); putParcelable( bundle, maybeSanitizeLocationInfoForCaller( netCap, nri.mUid, nri.request.getRequestorPackageName())); break; } case ConnectivityManager.CALLBACK_IP_CHANGED: { putParcelable(bundle, linkPropertiesRestrictedForCallerPermissions( networkAgent.linkProperties, nri.mPid, nri.mUid)); break; } case ConnectivityManager.CALLBACK_BLK_CHANGED: { maybeLogBlockedStatusChanged(nri, networkAgent.network, arg1 != 0); msg.arg1 = arg1; break; } } msg.what = notificationType; msg.setData(bundle); try { if (VDBG) { String notification = ConnectivityManager.getCallbackName(notificationType); log("sending notification " + notification + " for " + nri.request); } nri.messenger.send(msg); } catch (RemoteException e) { // may occur naturally in the race of binder death. loge("RemoteException caught trying to send a callback msg for " + nri.request); } } private static void putParcelable(Bundle bundle, T t) { bundle.putParcelable(t.getClass().getSimpleName(), t); } private void teardownUnneededNetwork(NetworkAgentInfo nai) { if (nai.numRequestNetworkRequests() != 0) { for (int i = 0; i < nai.numNetworkRequests(); i++) { NetworkRequest nr = nai.requestAt(i); // Ignore listening requests. if (nr.isListen()) continue; loge("Dead network still had at least " + nr); break; } } nai.asyncChannel.disconnect(); } private void handleLingerComplete(NetworkAgentInfo oldNetwork) { if (oldNetwork == null) { loge("Unknown NetworkAgentInfo in handleLingerComplete"); return; } if (DBG) log("handleLingerComplete for " + oldNetwork.toShortString()); // If we get here it means that the last linger timeout for this network expired. So there // must be no other active linger timers, and we must stop lingering. oldNetwork.clearLingerState(); if (unneeded(oldNetwork, UnneededFor.TEARDOWN)) { // Tear the network down. teardownUnneededNetwork(oldNetwork); } else { // Put the network in the background. updateCapabilities(oldNetwork.getCurrentScore(), oldNetwork, oldNetwork.networkCapabilities); } } private void makeDefault(@Nullable final NetworkAgentInfo newNetwork) { if (DBG) log("Switching to new default network: " + newNetwork); mDefaultNetworkNai = newNetwork; try { if (null != newNetwork) { mNMS.setDefaultNetId(newNetwork.network.netId); } else { mNMS.clearDefaultNetId(); } } catch (Exception e) { loge("Exception setting default network :" + e); } notifyLockdownVpn(newNetwork); handleApplyDefaultProxy(null != newNetwork ? newNetwork.linkProperties.getHttpProxy() : null); updateTcpBufferSizes(null != newNetwork ? newNetwork.linkProperties.getTcpBufferSizes() : null); mDnsManager.setDefaultDnsSystemProperties(null != newNetwork ? newNetwork.linkProperties.getDnsServers() : Collections.EMPTY_LIST); notifyIfacesChangedForNetworkStats(); // Fix up the NetworkCapabilities of any VPNs that don't specify underlying networks. updateAllVpnsCapabilities(); } private void processListenRequests(@NonNull final NetworkAgentInfo nai) { // For consistency with previous behaviour, send onLost callbacks before onAvailable. processNewlyLostListenRequests(nai); notifyNetworkCallbacks(nai, ConnectivityManager.CALLBACK_CAP_CHANGED); processNewlySatisfiedListenRequests(nai); } private void processNewlyLostListenRequests(@NonNull final NetworkAgentInfo nai) { for (NetworkRequestInfo nri : mNetworkRequests.values()) { NetworkRequest nr = nri.request; if (!nr.isListen()) continue; if (nai.isSatisfyingRequest(nr.requestId) && !nai.satisfies(nr)) { nai.removeRequest(nri.request.requestId); callCallbackForRequest(nri, nai, ConnectivityManager.CALLBACK_LOST, 0); } } } private void processNewlySatisfiedListenRequests(@NonNull final NetworkAgentInfo nai) { for (NetworkRequestInfo nri : mNetworkRequests.values()) { NetworkRequest nr = nri.request; if (!nr.isListen()) continue; if (nai.satisfies(nr) && !nai.isSatisfyingRequest(nr.requestId)) { nai.addRequest(nr); notifyNetworkAvailable(nai, nri); } } } // An accumulator class to gather the list of changes that result from a rematch. private static class NetworkReassignment { static class RequestReassignment { @NonNull public final NetworkRequestInfo mRequest; @Nullable public final NetworkAgentInfo mOldNetwork; @Nullable public final NetworkAgentInfo mNewNetwork; RequestReassignment(@NonNull final NetworkRequestInfo request, @Nullable final NetworkAgentInfo oldNetwork, @Nullable final NetworkAgentInfo newNetwork) { mRequest = request; mOldNetwork = oldNetwork; mNewNetwork = newNetwork; } public String toString() { return mRequest.request.requestId + " : " + (null != mOldNetwork ? mOldNetwork.network.netId : "null") + " → " + (null != mNewNetwork ? mNewNetwork.network.netId : "null"); } } @NonNull private final ArrayList mReassignments = new ArrayList<>(); @NonNull Iterable getRequestReassignments() { return mReassignments; } void addRequestReassignment(@NonNull final RequestReassignment reassignment) { if (!Build.IS_USER) { // The code is never supposed to add two reassignments of the same request. Make // sure this stays true, but without imposing this expensive check on all // reassignments on all user devices. for (final RequestReassignment existing : mReassignments) { if (existing.mRequest.equals(reassignment.mRequest)) { throw new IllegalStateException("Trying to reassign [" + reassignment + "] but already have [" + existing + "]"); } } } mReassignments.add(reassignment); } // Will return null if this reassignment does not change the network assigned to // the passed request. @Nullable private RequestReassignment getReassignment(@NonNull final NetworkRequestInfo nri) { for (final RequestReassignment event : getRequestReassignments()) { if (nri == event.mRequest) return event; } return null; } public String toString() { final StringJoiner sj = new StringJoiner(", " /* delimiter */, "NetReassign [" /* prefix */, "]" /* suffix */); if (mReassignments.isEmpty()) return sj.add("no changes").toString(); for (final RequestReassignment rr : getRequestReassignments()) { sj.add(rr.toString()); } return sj.toString(); } public String debugString() { final StringBuilder sb = new StringBuilder(); sb.append("NetworkReassignment :"); if (mReassignments.isEmpty()) return sb.append(" no changes").toString(); for (final RequestReassignment rr : getRequestReassignments()) { sb.append("\n ").append(rr); } return sb.append("\n").toString(); } } private void updateSatisfiersForRematchRequest(@NonNull final NetworkRequestInfo nri, @Nullable final NetworkAgentInfo previousSatisfier, @Nullable final NetworkAgentInfo newSatisfier, final long now) { if (newSatisfier != null) { if (VDBG) log("rematch for " + newSatisfier.toShortString()); if (previousSatisfier != null) { if (VDBG || DDBG) { log(" accepting network in place of " + previousSatisfier.toShortString()); } previousSatisfier.removeRequest(nri.request.requestId); previousSatisfier.lingerRequest(nri.request, now, mLingerDelayMs); } else { if (VDBG || DDBG) log(" accepting network in place of null"); } newSatisfier.unlingerRequest(nri.request); if (!newSatisfier.addRequest(nri.request)) { Slog.wtf(TAG, "BUG: " + newSatisfier.toShortString() + " already has " + nri.request); } } else { if (DBG) { log("Network " + previousSatisfier.toShortString() + " stopped satisfying" + " request " + nri.request.requestId); } previousSatisfier.removeRequest(nri.request.requestId); } nri.mSatisfier = newSatisfier; } @NonNull private NetworkReassignment computeNetworkReassignment() { ensureRunningOnConnectivityServiceThread(); final NetworkReassignment changes = new NetworkReassignment(); // Gather the list of all relevant agents and sort them by score. final ArrayList nais = new ArrayList<>(); for (final NetworkAgentInfo nai : mNetworkAgentInfos.values()) { if (!nai.everConnected) continue; nais.add(nai); } for (final NetworkRequestInfo nri : mNetworkRequests.values()) { if (nri.request.isListen()) continue; final NetworkAgentInfo bestNetwork = mNetworkRanker.getBestNetwork(nri.request, nais); if (bestNetwork != nri.mSatisfier) { // bestNetwork may be null if no network can satisfy this request. changes.addRequestReassignment(new NetworkReassignment.RequestReassignment( nri, nri.mSatisfier, bestNetwork)); } } return changes; } /** * Attempt to rematch all Networks with NetworkRequests. This may result in Networks * being disconnected. */ private void rematchAllNetworksAndRequests() { // TODO: This may be slow, and should be optimized. final long now = SystemClock.elapsedRealtime(); final NetworkReassignment changes = computeNetworkReassignment(); if (VDBG || DDBG) { log(changes.debugString()); } else if (DBG) { log(changes.toString()); // Shorter form, only one line of log } applyNetworkReassignment(changes, now); } private void applyNetworkReassignment(@NonNull final NetworkReassignment changes, final long now) { final Collection nais = mNetworkAgentInfos.values(); // Since most of the time there are only 0 or 1 background networks, it would probably // be more efficient to just use an ArrayList here. TODO : measure performance final ArraySet oldBgNetworks = new ArraySet<>(); for (final NetworkAgentInfo nai : nais) { if (nai.isBackgroundNetwork()) oldBgNetworks.add(nai); } // First, update the lists of satisfied requests in the network agents. This is necessary // because some code later depends on this state to be correct, most prominently computing // the linger status. for (final NetworkReassignment.RequestReassignment event : changes.getRequestReassignments()) { updateSatisfiersForRematchRequest(event.mRequest, event.mOldNetwork, event.mNewNetwork, now); } final NetworkAgentInfo oldDefaultNetwork = getDefaultNetwork(); final NetworkRequestInfo defaultRequestInfo = mNetworkRequests.get(mDefaultRequest); final NetworkReassignment.RequestReassignment reassignment = changes.getReassignment(defaultRequestInfo); final NetworkAgentInfo newDefaultNetwork = null != reassignment ? reassignment.mNewNetwork : oldDefaultNetwork; if (oldDefaultNetwork != newDefaultNetwork) { if (oldDefaultNetwork != null) { mLingerMonitor.noteLingerDefaultNetwork(oldDefaultNetwork, newDefaultNetwork); } updateDataActivityTracking(newDefaultNetwork, oldDefaultNetwork); // Notify system services of the new default. makeDefault(newDefaultNetwork); // Log 0 -> X and Y -> X default network transitions, where X is the new default. mDeps.getMetricsLogger().defaultNetworkMetrics().logDefaultNetworkEvent( now, newDefaultNetwork, oldDefaultNetwork); // Have a new default network, release the transition wakelock in scheduleReleaseNetworkTransitionWakelock(); } // Notify requested networks are available after the default net is switched, but // before LegacyTypeTracker sends legacy broadcasts for (final NetworkReassignment.RequestReassignment event : changes.getRequestReassignments()) { // Tell NetworkProviders about the new score, so they can stop // trying to connect if they know they cannot match it. // TODO - this could get expensive if there are a lot of outstanding requests for this // network. Think of a way to reduce this. Push netid->request mapping to each factory? sendUpdatedScoreToFactories(event.mRequest.request, event.mNewNetwork); if (null != event.mNewNetwork) { notifyNetworkAvailable(event.mNewNetwork, event.mRequest); } else { callCallbackForRequest(event.mRequest, event.mOldNetwork, ConnectivityManager.CALLBACK_LOST, 0); } } // Update the linger state before processing listen callbacks, because the background // computation depends on whether the network is lingering. Don't send the LOSING callbacks // just yet though, because they have to be sent after the listens are processed to keep // backward compatibility. final ArrayList lingeredNetworks = new ArrayList<>(); for (final NetworkAgentInfo nai : nais) { // Rematching may have altered the linger state of some networks, so update all linger // timers. updateLingerState reads the state from the network agent and does nothing // if the state has not changed : the source of truth is controlled with // NetworkAgentInfo#lingerRequest and NetworkAgentInfo#unlingerRequest, which have been // called while rematching the individual networks above. if (updateLingerState(nai, now)) { lingeredNetworks.add(nai); } } for (final NetworkAgentInfo nai : nais) { if (!nai.everConnected) continue; final boolean oldBackground = oldBgNetworks.contains(nai); // Process listen requests and update capabilities if the background state has // changed for this network. For consistency with previous behavior, send onLost // callbacks before onAvailable. processNewlyLostListenRequests(nai); if (oldBackground != nai.isBackgroundNetwork()) { applyBackgroundChangeForRematch(nai); } processNewlySatisfiedListenRequests(nai); } for (final NetworkAgentInfo nai : lingeredNetworks) { notifyNetworkLosing(nai, now); } updateLegacyTypeTrackerAndVpnLockdownForRematch(oldDefaultNetwork, newDefaultNetwork, nais); // Tear down all unneeded networks. for (NetworkAgentInfo nai : mNetworkAgentInfos.values()) { if (unneeded(nai, UnneededFor.TEARDOWN)) { if (nai.getLingerExpiry() > 0) { // This network has active linger timers and no requests, but is not // lingering. Linger it. // // One way (the only way?) this can happen if this network is unvalidated // and became unneeded due to another network improving its score to the // point where this network will no longer be able to satisfy any requests // even if it validates. if (updateLingerState(nai, now)) { notifyNetworkLosing(nai, now); } } else { if (DBG) log("Reaping " + nai.toShortString()); teardownUnneededNetwork(nai); } } } } /** * Apply a change in background state resulting from rematching networks with requests. * * During rematch, a network may change background states by starting to satisfy or stopping * to satisfy a foreground request. Listens don't count for this. When a network changes * background states, its capabilities need to be updated and callbacks fired for the * capability change. * * @param nai The network that changed background states */ private void applyBackgroundChangeForRematch(@NonNull final NetworkAgentInfo nai) { final NetworkCapabilities newNc = mixInCapabilities(nai, nai.networkCapabilities); if (Objects.equals(nai.networkCapabilities, newNc)) return; updateNetworkPermissions(nai, newNc); nai.getAndSetNetworkCapabilities(newNc); notifyNetworkCallbacks(nai, ConnectivityManager.CALLBACK_CAP_CHANGED); } private void updateLegacyTypeTrackerAndVpnLockdownForRematch( @Nullable final NetworkAgentInfo oldDefaultNetwork, @Nullable final NetworkAgentInfo newDefaultNetwork, @NonNull final Collection nais) { if (oldDefaultNetwork != newDefaultNetwork) { // Maintain the illusion : since the legacy API only understands one network at a time, // if the default network changed, apps should see a disconnected broadcast for the // old default network before they see a connected broadcast for the new one. if (oldDefaultNetwork != null) { mLegacyTypeTracker.remove(oldDefaultNetwork.networkInfo.getType(), oldDefaultNetwork, true); } if (newDefaultNetwork != null) { // The new default network can be newly null if and only if the old default // network doesn't satisfy the default request any more because it lost a // capability. mDefaultInetConditionPublished = newDefaultNetwork.lastValidated ? 100 : 0; mLegacyTypeTracker.add(newDefaultNetwork.networkInfo.getType(), newDefaultNetwork); // If the legacy VPN is connected, notifyLockdownVpn may end up sending a broadcast // to reflect the NetworkInfo of this new network. This broadcast has to be sent // after the disconnect broadcasts above, but before the broadcasts sent by the // legacy type tracker below. // TODO : refactor this, it's too complex notifyLockdownVpn(newDefaultNetwork); } } // Now that all the callbacks have been sent, send the legacy network broadcasts // as needed. This is necessary so that legacy requests correctly bind dns // requests to this network. The legacy users are listening for this broadcast // and will generally do a dns request so they can ensureRouteToHost and if // they do that before the callbacks happen they'll use the default network. // // TODO: Is there still a race here? The legacy broadcast will be sent after sending // callbacks, but if apps can receive the broadcast before the callback, they still might // have an inconsistent view of networking. // // This *does* introduce a race where if the user uses the new api // (notification callbacks) and then uses the old api (getNetworkInfo(type)) // they may get old info. Reverse this after the old startUsing api is removed. // This is on top of the multiple intent sequencing referenced in the todo above. for (NetworkAgentInfo nai : nais) { if (nai.everConnected) { addNetworkToLegacyTypeTracker(nai); } } } private void addNetworkToLegacyTypeTracker(@NonNull final NetworkAgentInfo nai) { for (int i = 0; i < nai.numNetworkRequests(); i++) { NetworkRequest nr = nai.requestAt(i); if (nr.legacyType != TYPE_NONE && nr.isRequest()) { // legacy type tracker filters out repeat adds mLegacyTypeTracker.add(nr.legacyType, nai); } } // A VPN generally won't get added to the legacy tracker in the "for (nri)" loop above, // because usually there are no NetworkRequests it satisfies (e.g., mDefaultRequest // wants the NOT_VPN capability, so it will never be satisfied by a VPN). So, add the // newNetwork to the tracker explicitly (it's a no-op if it has already been added). if (nai.isVPN()) { mLegacyTypeTracker.add(TYPE_VPN, nai); } } private void updateInetCondition(NetworkAgentInfo nai) { // Don't bother updating until we've graduated to validated at least once. if (!nai.everValidated) return; // For now only update icons for default connection. // TODO: Update WiFi and cellular icons separately. b/17237507 if (!isDefaultNetwork(nai)) return; int newInetCondition = nai.lastValidated ? 100 : 0; // Don't repeat publish. if (newInetCondition == mDefaultInetConditionPublished) return; mDefaultInetConditionPublished = newInetCondition; sendInetConditionBroadcast(nai.networkInfo); } private void notifyLockdownVpn(NetworkAgentInfo nai) { synchronized (mVpns) { if (mLockdownTracker != null) { if (nai != null && nai.isVPN()) { mLockdownTracker.onVpnStateChanged(nai.networkInfo); } else { mLockdownTracker.onNetworkInfoChanged(); } } } } @NonNull private NetworkInfo mixInInfo(@NonNull final NetworkAgentInfo nai, @NonNull NetworkInfo info) { final NetworkInfo newInfo = new NetworkInfo(info); // The suspended and roaming bits are managed in NetworkCapabilities. final boolean suspended = !nai.networkCapabilities.hasCapability(NET_CAPABILITY_NOT_SUSPENDED); if (suspended && info.getDetailedState() == NetworkInfo.DetailedState.CONNECTED) { // Only override the state with SUSPENDED if the network is currently in CONNECTED // state. This is because the network could have been suspended before connecting, // or it could be disconnecting while being suspended, and in both these cases // the state should not be overridden. Note that the only detailed state that // maps to State.CONNECTED is DetailedState.CONNECTED, so there is also no need to // worry about multiple different substates of CONNECTED. newInfo.setDetailedState(NetworkInfo.DetailedState.SUSPENDED, info.getReason(), info.getExtraInfo()); } else if (!suspended && info.getDetailedState() == NetworkInfo.DetailedState.SUSPENDED) { // SUSPENDED state is currently only overridden from CONNECTED state. In the case the // network agent is created, then goes to suspended, then goes out of suspended without // ever setting connected. Check if network agent is ever connected to update the state. newInfo.setDetailedState(nai.everConnected ? NetworkInfo.DetailedState.CONNECTED : NetworkInfo.DetailedState.CONNECTING, info.getReason(), info.getExtraInfo()); } newInfo.setRoaming(!nai.networkCapabilities.hasCapability(NET_CAPABILITY_NOT_ROAMING)); return newInfo; } private void updateNetworkInfo(NetworkAgentInfo networkAgent, NetworkInfo info) { final NetworkInfo newInfo = mixInInfo(networkAgent, info); final NetworkInfo.State state = newInfo.getState(); NetworkInfo oldInfo = null; synchronized (networkAgent) { oldInfo = networkAgent.networkInfo; networkAgent.networkInfo = newInfo; } notifyLockdownVpn(networkAgent); if (DBG) { log(networkAgent.toShortString() + " EVENT_NETWORK_INFO_CHANGED, going from " + oldInfo.getState() + " to " + state); } if (!networkAgent.created && (state == NetworkInfo.State.CONNECTED || (state == NetworkInfo.State.CONNECTING && networkAgent.isVPN()))) { // A network that has just connected has zero requests and is thus a foreground network. networkAgent.networkCapabilities.addCapability(NET_CAPABILITY_FOREGROUND); if (!createNativeNetwork(networkAgent)) return; if (networkAgent.isVPN()) { // Initialize the VPN capabilities to their starting values according to the // underlying networks. This will avoid a spurious callback to // onCapabilitiesUpdated being sent in updateAllVpnCapabilities below as // the VPN would switch from its default, blank capabilities to those // that reflect the capabilities of its underlying networks. updateAllVpnsCapabilities(); } networkAgent.created = true; } if (!networkAgent.everConnected && state == NetworkInfo.State.CONNECTED) { networkAgent.everConnected = true; if (networkAgent.linkProperties == null) { Slog.wtf(TAG, networkAgent.toShortString() + " connected with null LinkProperties"); } // NetworkCapabilities need to be set before sending the private DNS config to // NetworkMonitor, otherwise NetworkMonitor cannot determine if validation is required. networkAgent.getAndSetNetworkCapabilities(networkAgent.networkCapabilities); handlePerNetworkPrivateDnsConfig(networkAgent, mDnsManager.getPrivateDnsConfig()); updateLinkProperties(networkAgent, new LinkProperties(networkAgent.linkProperties), null); // Until parceled LinkProperties are sent directly to NetworkMonitor, the connect // command must be sent after updating LinkProperties to maximize chances of // NetworkMonitor seeing the correct LinkProperties when starting. // TODO: pass LinkProperties to the NetworkMonitor in the notifyNetworkConnected call. if (networkAgent.networkAgentConfig.acceptPartialConnectivity) { networkAgent.networkMonitor().setAcceptPartialConnectivity(); } networkAgent.networkMonitor().notifyNetworkConnected( new LinkProperties(networkAgent.linkProperties, true /* parcelSensitiveFields */), networkAgent.networkCapabilities); scheduleUnvalidatedPrompt(networkAgent); // Whether a particular NetworkRequest listen should cause signal strength thresholds to // be communicated to a particular NetworkAgent depends only on the network's immutable, // capabilities, so it only needs to be done once on initial connect, not every time the // network's capabilities change. Note that we do this before rematching the network, // so we could decide to tear it down immediately afterwards. That's fine though - on // disconnection NetworkAgents should stop any signal strength monitoring they have been // doing. updateSignalStrengthThresholds(networkAgent, "CONNECT", null); if (networkAgent.isVPN()) { updateAllVpnsCapabilities(); } // Consider network even though it is not yet validated. rematchAllNetworksAndRequests(); // This has to happen after matching the requests, because callbacks are just requests. notifyNetworkCallbacks(networkAgent, ConnectivityManager.CALLBACK_PRECHECK); } else if (state == NetworkInfo.State.DISCONNECTED) { networkAgent.asyncChannel.disconnect(); if (networkAgent.isVPN()) { updateUids(networkAgent, networkAgent.networkCapabilities, null); } disconnectAndDestroyNetwork(networkAgent); if (networkAgent.isVPN()) { // As the active or bound network changes for apps, broadcast the default proxy, as // apps may need to update their proxy data. This is called after disconnecting from // VPN to make sure we do not broadcast the old proxy data. // TODO(b/122649188): send the broadcast only to VPN users. mProxyTracker.sendProxyBroadcast(); } } else if (networkAgent.created && (oldInfo.getState() == NetworkInfo.State.SUSPENDED || state == NetworkInfo.State.SUSPENDED)) { mLegacyTypeTracker.update(networkAgent); } } private void updateNetworkScore(@NonNull final NetworkAgentInfo nai, final int score) { if (VDBG || DDBG) log("updateNetworkScore for " + nai.toShortString() + " to " + score); nai.setScore(score); rematchAllNetworksAndRequests(); sendUpdatedScoreToFactories(nai); } // Notify only this one new request of the current state. Transfer all the // current state by calling NetworkCapabilities and LinkProperties callbacks // so that callers can be guaranteed to have as close to atomicity in state // transfer as can be supported by this current API. protected void notifyNetworkAvailable(NetworkAgentInfo nai, NetworkRequestInfo nri) { mHandler.removeMessages(EVENT_TIMEOUT_NETWORK_REQUEST, nri); if (nri.mPendingIntent != null) { sendPendingIntentForRequest(nri, nai, ConnectivityManager.CALLBACK_AVAILABLE); // Attempt no subsequent state pushes where intents are involved. return; } final boolean metered = nai.networkCapabilities.isMetered(); final boolean blocked = isUidNetworkingWithVpnBlocked(nri.mUid, mUidRules.get(nri.mUid), metered, mRestrictBackground); callCallbackForRequest(nri, nai, ConnectivityManager.CALLBACK_AVAILABLE, blocked ? 1 : 0); } // Notify the requests on this NAI that the network is now lingered. private void notifyNetworkLosing(@NonNull final NetworkAgentInfo nai, final long now) { final int lingerTime = (int) (nai.getLingerExpiry() - now); notifyNetworkCallbacks(nai, ConnectivityManager.CALLBACK_LOSING, lingerTime); } /** * Notify of the blocked state apps with a registered callback matching a given NAI. * * Unlike other callbacks, blocked status is different between each individual uid. So for * any given nai, all requests need to be considered according to the uid who filed it. * * @param nai The target NetworkAgentInfo. * @param oldMetered True if the previous network capabilities is metered. * @param newRestrictBackground True if data saver is enabled. */ private void maybeNotifyNetworkBlocked(NetworkAgentInfo nai, boolean oldMetered, boolean newMetered, boolean oldRestrictBackground, boolean newRestrictBackground) { for (int i = 0; i < nai.numNetworkRequests(); i++) { NetworkRequest nr = nai.requestAt(i); NetworkRequestInfo nri = mNetworkRequests.get(nr); final int uidRules = mUidRules.get(nri.mUid); final boolean oldBlocked, newBlocked; // mVpns lock needs to be hold here to ensure that the active VPN cannot be changed // between these two calls. synchronized (mVpns) { oldBlocked = isUidNetworkingWithVpnBlocked(nri.mUid, uidRules, oldMetered, oldRestrictBackground); newBlocked = isUidNetworkingWithVpnBlocked(nri.mUid, uidRules, newMetered, newRestrictBackground); } if (oldBlocked != newBlocked) { callCallbackForRequest(nri, nai, ConnectivityManager.CALLBACK_BLK_CHANGED, encodeBool(newBlocked)); } } } /** * Notify apps with a given UID of the new blocked state according to new uid rules. * @param uid The uid for which the rules changed. * @param newRules The new rules to apply. */ private void maybeNotifyNetworkBlockedForNewUidRules(int uid, int newRules) { for (final NetworkAgentInfo nai : mNetworkAgentInfos.values()) { final boolean metered = nai.networkCapabilities.isMetered(); final boolean oldBlocked, newBlocked; // TODO: Consider that doze mode or turn on/off battery saver would deliver lots of uid // rules changed event. And this function actually loop through all connected nai and // its requests. It seems that mVpns lock will be grabbed frequently in this case. // Reduce the number of locking or optimize the use of lock are likely needed in future. synchronized (mVpns) { oldBlocked = isUidNetworkingWithVpnBlocked( uid, mUidRules.get(uid), metered, mRestrictBackground); newBlocked = isUidNetworkingWithVpnBlocked( uid, newRules, metered, mRestrictBackground); } if (oldBlocked == newBlocked) { continue; } final int arg = encodeBool(newBlocked); for (int i = 0; i < nai.numNetworkRequests(); i++) { NetworkRequest nr = nai.requestAt(i); NetworkRequestInfo nri = mNetworkRequests.get(nr); if (nri != null && nri.mUid == uid) { callCallbackForRequest(nri, nai, ConnectivityManager.CALLBACK_BLK_CHANGED, arg); } } } } @VisibleForTesting protected void sendLegacyNetworkBroadcast(NetworkAgentInfo nai, DetailedState state, int type) { // The NetworkInfo we actually send out has no bearing on the real // state of affairs. For example, if the default connection is mobile, // and a request for HIPRI has just gone away, we need to pretend that // HIPRI has just disconnected. So we need to set the type to HIPRI and // the state to DISCONNECTED, even though the network is of type MOBILE // and is still connected. NetworkInfo info = new NetworkInfo(nai.networkInfo); info.setType(type); if (state != DetailedState.DISCONNECTED) { info.setDetailedState(state, null, info.getExtraInfo()); sendConnectedBroadcast(info); } else { info.setDetailedState(state, info.getReason(), info.getExtraInfo()); Intent intent = new Intent(ConnectivityManager.CONNECTIVITY_ACTION); intent.putExtra(ConnectivityManager.EXTRA_NETWORK_INFO, info); intent.putExtra(ConnectivityManager.EXTRA_NETWORK_TYPE, info.getType()); if (info.isFailover()) { intent.putExtra(ConnectivityManager.EXTRA_IS_FAILOVER, true); nai.networkInfo.setFailover(false); } if (info.getReason() != null) { intent.putExtra(ConnectivityManager.EXTRA_REASON, info.getReason()); } if (info.getExtraInfo() != null) { intent.putExtra(ConnectivityManager.EXTRA_EXTRA_INFO, info.getExtraInfo()); } NetworkAgentInfo newDefaultAgent = null; if (nai.isSatisfyingRequest(mDefaultRequest.requestId)) { newDefaultAgent = getDefaultNetwork(); if (newDefaultAgent != null) { intent.putExtra(ConnectivityManager.EXTRA_OTHER_NETWORK_INFO, newDefaultAgent.networkInfo); } else { intent.putExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, true); } } intent.putExtra(ConnectivityManager.EXTRA_INET_CONDITION, mDefaultInetConditionPublished); sendStickyBroadcast(intent); if (newDefaultAgent != null) { sendConnectedBroadcast(newDefaultAgent.networkInfo); } } } protected void notifyNetworkCallbacks(NetworkAgentInfo networkAgent, int notifyType, int arg1) { if (VDBG || DDBG) { String notification = ConnectivityManager.getCallbackName(notifyType); log("notifyType " + notification + " for " + networkAgent.toShortString()); } for (int i = 0; i < networkAgent.numNetworkRequests(); i++) { NetworkRequest nr = networkAgent.requestAt(i); NetworkRequestInfo nri = mNetworkRequests.get(nr); if (VDBG) log(" sending notification for " + nr); if (nri.mPendingIntent == null) { callCallbackForRequest(nri, networkAgent, notifyType, arg1); } else { sendPendingIntentForRequest(nri, networkAgent, notifyType); } } } protected void notifyNetworkCallbacks(NetworkAgentInfo networkAgent, int notifyType) { notifyNetworkCallbacks(networkAgent, notifyType, 0); } /** * Returns the list of all interfaces that could be used by network traffic that does not * explicitly specify a network. This includes the default network, but also all VPNs that are * currently connected. * * Must be called on the handler thread. */ private Network[] getDefaultNetworks() { ensureRunningOnConnectivityServiceThread(); ArrayList defaultNetworks = new ArrayList<>(); NetworkAgentInfo defaultNetwork = getDefaultNetwork(); for (NetworkAgentInfo nai : mNetworkAgentInfos.values()) { if (nai.everConnected && (nai == defaultNetwork || nai.isVPN())) { defaultNetworks.add(nai.network); } } return defaultNetworks.toArray(new Network[0]); } /** * Notify NetworkStatsService that the set of active ifaces has changed, or that one of the * active iface's tracked properties has changed. */ private void notifyIfacesChangedForNetworkStats() { ensureRunningOnConnectivityServiceThread(); String activeIface = null; LinkProperties activeLinkProperties = getActiveLinkProperties(); if (activeLinkProperties != null) { activeIface = activeLinkProperties.getInterfaceName(); } final VpnInfo[] vpnInfos = getAllVpnInfo(); try { mStatsService.forceUpdateIfaces( getDefaultNetworks(), getAllNetworkState(), activeIface, vpnInfos); } catch (Exception ignored) { } } @Override public boolean addVpnAddress(String address, int prefixLength) { int user = UserHandle.getUserId(Binder.getCallingUid()); synchronized (mVpns) { throwIfLockdownEnabled(); return mVpns.get(user).addAddress(address, prefixLength); } } @Override public boolean removeVpnAddress(String address, int prefixLength) { int user = UserHandle.getUserId(Binder.getCallingUid()); synchronized (mVpns) { throwIfLockdownEnabled(); return mVpns.get(user).removeAddress(address, prefixLength); } } @Override public boolean setUnderlyingNetworksForVpn(Network[] networks) { int user = UserHandle.getUserId(Binder.getCallingUid()); final boolean success; synchronized (mVpns) { throwIfLockdownEnabled(); success = mVpns.get(user).setUnderlyingNetworks(networks); } if (success) { mHandler.post(() -> { // Update VPN's capabilities based on updated underlying network set. updateAllVpnsCapabilities(); notifyIfacesChangedForNetworkStats(); }); } return success; } @Override public String getCaptivePortalServerUrl() { enforceNetworkStackOrSettingsPermission(); String settingUrl = mContext.getResources().getString( R.string.config_networkCaptivePortalServerUrl); if (!TextUtils.isEmpty(settingUrl)) { return settingUrl; } settingUrl = Settings.Global.getString(mContext.getContentResolver(), Settings.Global.CAPTIVE_PORTAL_HTTP_URL); if (!TextUtils.isEmpty(settingUrl)) { return settingUrl; } return DEFAULT_CAPTIVE_PORTAL_HTTP_URL; } @Override public void startNattKeepalive(Network network, int intervalSeconds, ISocketKeepaliveCallback cb, String srcAddr, int srcPort, String dstAddr) { enforceKeepalivePermission(); mKeepaliveTracker.startNattKeepalive( getNetworkAgentInfoForNetwork(network), null /* fd */, intervalSeconds, cb, srcAddr, srcPort, dstAddr, NattSocketKeepalive.NATT_PORT); } @Override public void startNattKeepaliveWithFd(Network network, FileDescriptor fd, int resourceId, int intervalSeconds, ISocketKeepaliveCallback cb, String srcAddr, String dstAddr) { mKeepaliveTracker.startNattKeepalive( getNetworkAgentInfoForNetwork(network), fd, resourceId, intervalSeconds, cb, srcAddr, dstAddr, NattSocketKeepalive.NATT_PORT); } @Override public void startTcpKeepalive(Network network, FileDescriptor fd, int intervalSeconds, ISocketKeepaliveCallback cb) { enforceKeepalivePermission(); mKeepaliveTracker.startTcpKeepalive( getNetworkAgentInfoForNetwork(network), fd, intervalSeconds, cb); } @Override public void stopKeepalive(Network network, int slot) { mHandler.sendMessage(mHandler.obtainMessage( NetworkAgent.CMD_STOP_SOCKET_KEEPALIVE, slot, SocketKeepalive.SUCCESS, network)); } @Override public void factoryReset() { enforceSettingsPermission(); if (mUserManager.hasUserRestriction(UserManager.DISALLOW_NETWORK_RESET)) { return; } final int userId = UserHandle.getCallingUserId(); Binder.withCleanCallingIdentity(() -> { final IpMemoryStore ipMemoryStore = IpMemoryStore.getMemoryStore(mContext); ipMemoryStore.factoryReset(); }); // Turn airplane mode off setAirplaneMode(false); if (!mUserManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_VPN)) { // Remove always-on package synchronized (mVpns) { final String alwaysOnPackage = getAlwaysOnVpnPackage(userId); if (alwaysOnPackage != null) { setAlwaysOnVpnPackage(userId, null, false, null); setVpnPackageAuthorization(alwaysOnPackage, userId, VpnManager.TYPE_VPN_NONE); } // Turn Always-on VPN off if (mLockdownEnabled && userId == UserHandle.USER_SYSTEM) { final long ident = Binder.clearCallingIdentity(); try { mKeyStore.delete(Credentials.LOCKDOWN_VPN); mLockdownEnabled = false; setLockdownTracker(null); } finally { Binder.restoreCallingIdentity(ident); } } // Turn VPN off VpnConfig vpnConfig = getVpnConfig(userId); if (vpnConfig != null) { if (vpnConfig.legacy) { prepareVpn(VpnConfig.LEGACY_VPN, VpnConfig.LEGACY_VPN, userId); } else { // Prevent this app (packagename = vpnConfig.user) from initiating // VPN connections in the future without user intervention. setVpnPackageAuthorization( vpnConfig.user, userId, VpnManager.TYPE_VPN_NONE); prepareVpn(null, VpnConfig.LEGACY_VPN, userId); } } } } // restore private DNS settings to default mode (opportunistic) if (!mUserManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_PRIVATE_DNS)) { Settings.Global.putString(mContext.getContentResolver(), Settings.Global.PRIVATE_DNS_MODE, PRIVATE_DNS_MODE_OPPORTUNISTIC); } Settings.Global.putString(mContext.getContentResolver(), Settings.Global.NETWORK_AVOID_BAD_WIFI, null); } @Override public byte[] getNetworkWatchlistConfigHash() { NetworkWatchlistManager nwm = mContext.getSystemService(NetworkWatchlistManager.class); if (nwm == null) { loge("Unable to get NetworkWatchlistManager"); return null; } // Redirect it to network watchlist service to access watchlist file and calculate hash. return nwm.getWatchlistConfigHash(); } private void logNetworkEvent(NetworkAgentInfo nai, int evtype) { int[] transports = nai.networkCapabilities.getTransportTypes(); mMetricsLog.log(nai.network.netId, transports, new NetworkEvent(evtype)); } private static boolean toBool(int encodedBoolean) { return encodedBoolean != 0; // Only 0 means false. } private static int encodeBool(boolean b) { return b ? 1 : 0; } @Override public void onShellCommand(@NonNull FileDescriptor in, @NonNull FileDescriptor out, FileDescriptor err, @NonNull String[] args, ShellCallback callback, @NonNull ResultReceiver resultReceiver) { (new ShellCmd()).exec(this, in, out, err, args, callback, resultReceiver); } private class ShellCmd extends ShellCommand { @Override public int onCommand(String cmd) { if (cmd == null) { return handleDefaultCommands(cmd); } final PrintWriter pw = getOutPrintWriter(); try { switch (cmd) { case "airplane-mode": final String action = getNextArg(); if ("enable".equals(action)) { setAirplaneMode(true); return 0; } else if ("disable".equals(action)) { setAirplaneMode(false); return 0; } else if (action == null) { final ContentResolver cr = mContext.getContentResolver(); final int enabled = Settings.Global.getInt(cr, Settings.Global.AIRPLANE_MODE_ON); pw.println(enabled == 0 ? "disabled" : "enabled"); return 0; } else { onHelp(); return -1; } default: return handleDefaultCommands(cmd); } } catch (Exception e) { pw.println(e); } return -1; } @Override public void onHelp() { PrintWriter pw = getOutPrintWriter(); pw.println("Connectivity service commands:"); pw.println(" help"); pw.println(" Print this help text."); pw.println(" airplane-mode [enable|disable]"); pw.println(" Turn airplane mode on or off."); pw.println(" airplane-mode"); pw.println(" Get airplane mode."); } } @GuardedBy("mVpns") private Vpn getVpnIfOwner() { return getVpnIfOwner(Binder.getCallingUid()); } @GuardedBy("mVpns") private Vpn getVpnIfOwner(int uid) { final int user = UserHandle.getUserId(uid); final Vpn vpn = mVpns.get(user); if (vpn == null) { return null; } else { final VpnInfo info = vpn.getVpnInfo(); return (info == null || info.ownerUid != uid) ? null : vpn; } } /** * Caller either needs to be an active VPN, or hold the NETWORK_STACK permission * for testing. */ private Vpn enforceActiveVpnOrNetworkStackPermission() { if (checkNetworkStackPermission()) { return null; } synchronized (mVpns) { Vpn vpn = getVpnIfOwner(); if (vpn != null) { return vpn; } } throw new SecurityException("App must either be an active VPN or have the NETWORK_STACK " + "permission"); } /** * @param connectionInfo the connection to resolve. * @return {@code uid} if the connection is found and the app has permission to observe it * (e.g., if it is associated with the calling VPN app's tunnel) or {@code INVALID_UID} if the * connection is not found. */ public int getConnectionOwnerUid(ConnectionInfo connectionInfo) { final Vpn vpn = enforceActiveVpnOrNetworkStackPermission(); // Only VpnService based VPNs should be able to get this information. if (vpn != null && vpn.getActiveAppVpnType() != VpnManager.TYPE_VPN_SERVICE) { throw new SecurityException( "getConnectionOwnerUid() not allowed for non-VpnService VPNs"); } if (connectionInfo.protocol != IPPROTO_TCP && connectionInfo.protocol != IPPROTO_UDP) { throw new IllegalArgumentException("Unsupported protocol " + connectionInfo.protocol); } final int uid = InetDiagMessage.getConnectionOwnerUid(connectionInfo.protocol, connectionInfo.local, connectionInfo.remote); /* Filter out Uids not associated with the VPN. */ if (vpn != null && !vpn.appliesToUid(uid)) { return INVALID_UID; } return uid; } @Override public boolean isCallerCurrentAlwaysOnVpnApp() { synchronized (mVpns) { Vpn vpn = getVpnIfOwner(); return vpn != null && vpn.getAlwaysOn(); } } @Override public boolean isCallerCurrentAlwaysOnVpnLockdownApp() { synchronized (mVpns) { Vpn vpn = getVpnIfOwner(); return vpn != null && vpn.getLockdown(); } } /** * Returns a IBinder to a TestNetworkService. Will be lazily created as needed. * *

The TestNetworkService must be run in the system server due to TUN creation. */ @Override public IBinder startOrGetTestNetworkService() { synchronized (mTNSLock) { TestNetworkService.enforceTestNetworkPermissions(mContext); if (mTNS == null) { mTNS = new TestNetworkService(mContext, mNMS); } return mTNS; } } /** * Handler used for managing all Connectivity Diagnostics related functions. * * @see android.net.ConnectivityDiagnosticsManager * * TODO(b/147816404): Explore moving ConnectivityDiagnosticsHandler to a separate file */ @VisibleForTesting class ConnectivityDiagnosticsHandler extends Handler { private final String mTag = ConnectivityDiagnosticsHandler.class.getSimpleName(); /** * Used to handle ConnectivityDiagnosticsCallback registration events from {@link * android.net.ConnectivityDiagnosticsManager}. * obj = ConnectivityDiagnosticsCallbackInfo with IConnectivityDiagnosticsCallback and * NetworkRequestInfo to be registered */ private static final int EVENT_REGISTER_CONNECTIVITY_DIAGNOSTICS_CALLBACK = 1; /** * Used to handle ConnectivityDiagnosticsCallback unregister events from {@link * android.net.ConnectivityDiagnosticsManager}. * obj = the IConnectivityDiagnosticsCallback to be unregistered * arg1 = the uid of the caller */ private static final int EVENT_UNREGISTER_CONNECTIVITY_DIAGNOSTICS_CALLBACK = 2; /** * Event for {@link NetworkStateTrackerHandler} to trigger ConnectivityReport callbacks * after processing {@link #EVENT_NETWORK_TESTED} events. * obj = {@link ConnectivityReportEvent} representing ConnectivityReport info reported from * NetworkMonitor. * data = PersistableBundle of extras passed from NetworkMonitor. * *

See {@link ConnectivityService#EVENT_NETWORK_TESTED}. */ private static final int EVENT_NETWORK_TESTED = ConnectivityService.EVENT_NETWORK_TESTED; /** * Event for NetworkMonitor to inform ConnectivityService that a potential data stall has * been detected on the network. * obj = Long the timestamp (in millis) for when the suspected data stall was detected. * arg1 = {@link DataStallReport#DetectionMethod} indicating the detection method. * arg2 = NetID. * data = PersistableBundle of extras passed from NetworkMonitor. */ private static final int EVENT_DATA_STALL_SUSPECTED = 4; /** * Event for ConnectivityDiagnosticsHandler to handle network connectivity being reported to * the platform. This event will invoke {@link * IConnectivityDiagnosticsCallback#onNetworkConnectivityReported} for permissioned * callbacks. * obj = Network that was reported on * arg1 = boolint for the quality reported */ private static final int EVENT_NETWORK_CONNECTIVITY_REPORTED = 5; private ConnectivityDiagnosticsHandler(Looper looper) { super(looper); } @Override public void handleMessage(Message msg) { switch (msg.what) { case EVENT_REGISTER_CONNECTIVITY_DIAGNOSTICS_CALLBACK: { handleRegisterConnectivityDiagnosticsCallback( (ConnectivityDiagnosticsCallbackInfo) msg.obj); break; } case EVENT_UNREGISTER_CONNECTIVITY_DIAGNOSTICS_CALLBACK: { handleUnregisterConnectivityDiagnosticsCallback( (IConnectivityDiagnosticsCallback) msg.obj, msg.arg1); break; } case EVENT_NETWORK_TESTED: { final ConnectivityReportEvent reportEvent = (ConnectivityReportEvent) msg.obj; // This is safe because {@link // NetworkMonitorCallbacks#notifyNetworkTestedWithExtras} receives a // PersistableBundle and converts it to the Bundle in the incoming Message. If // {@link NetworkMonitorCallbacks#notifyNetworkTested} is called, msg.data will // not be set. This is also safe, as msg.getData() will return an empty Bundle. final PersistableBundle extras = new PersistableBundle(msg.getData()); handleNetworkTestedWithExtras(reportEvent, extras); break; } case EVENT_DATA_STALL_SUSPECTED: { final NetworkAgentInfo nai = getNetworkAgentInfoForNetId(msg.arg2); if (nai == null) break; // This is safe because NetworkMonitorCallbacks#notifyDataStallSuspected // receives a PersistableBundle and converts it to the Bundle in the incoming // Message. final PersistableBundle extras = new PersistableBundle(msg.getData()); handleDataStallSuspected(nai, (long) msg.obj, msg.arg1, extras); break; } case EVENT_NETWORK_CONNECTIVITY_REPORTED: { handleNetworkConnectivityReported((NetworkAgentInfo) msg.obj, toBool(msg.arg1)); break; } default: { Log.e(mTag, "Unrecognized event in ConnectivityDiagnostics: " + msg.what); } } } } /** Class used for cleaning up IConnectivityDiagnosticsCallback instances after their death. */ @VisibleForTesting class ConnectivityDiagnosticsCallbackInfo implements Binder.DeathRecipient { @NonNull private final IConnectivityDiagnosticsCallback mCb; @NonNull private final NetworkRequestInfo mRequestInfo; @NonNull private final String mCallingPackageName; @VisibleForTesting ConnectivityDiagnosticsCallbackInfo( @NonNull IConnectivityDiagnosticsCallback cb, @NonNull NetworkRequestInfo nri, @NonNull String callingPackageName) { mCb = cb; mRequestInfo = nri; mCallingPackageName = callingPackageName; } @Override public void binderDied() { log("ConnectivityDiagnosticsCallback IBinder died."); unregisterConnectivityDiagnosticsCallback(mCb); } } /** * Class used for sending information from {@link * NetworkMonitorCallbacks#notifyNetworkTestedWithExtras} to the handler for processing it. */ private static class NetworkTestedResults { private final int mNetId; private final int mTestResult; private final long mTimestampMillis; @Nullable private final String mRedirectUrl; private NetworkTestedResults( int netId, int testResult, long timestampMillis, @Nullable String redirectUrl) { mNetId = netId; mTestResult = testResult; mTimestampMillis = timestampMillis; mRedirectUrl = redirectUrl; } } /** * Class used for sending information from {@link NetworkStateTrackerHandler} to {@link * ConnectivityDiagnosticsHandler}. */ private static class ConnectivityReportEvent { private final long mTimestampMillis; @NonNull private final NetworkAgentInfo mNai; private ConnectivityReportEvent(long timestampMillis, @NonNull NetworkAgentInfo nai) { mTimestampMillis = timestampMillis; mNai = nai; } } private void handleRegisterConnectivityDiagnosticsCallback( @NonNull ConnectivityDiagnosticsCallbackInfo cbInfo) { ensureRunningOnConnectivityServiceThread(); final IConnectivityDiagnosticsCallback cb = cbInfo.mCb; final IBinder iCb = cb.asBinder(); final NetworkRequestInfo nri = cbInfo.mRequestInfo; // This means that the client registered the same callback multiple times. Do // not override the previous entry, and exit silently. if (mConnectivityDiagnosticsCallbacks.containsKey(iCb)) { if (VDBG) log("Diagnostics callback is already registered"); // Decrement the reference count for this NetworkRequestInfo. The reference count is // incremented when the NetworkRequestInfo is created as part of // enforceRequestCountLimit(). decrementNetworkRequestPerUidCount(nri); return; } mConnectivityDiagnosticsCallbacks.put(iCb, cbInfo); try { iCb.linkToDeath(cbInfo, 0); } catch (RemoteException e) { cbInfo.binderDied(); return; } // Once registered, provide ConnectivityReports for matching Networks final List matchingNetworks = new ArrayList<>(); synchronized (mNetworkForNetId) { for (int i = 0; i < mNetworkForNetId.size(); i++) { final NetworkAgentInfo nai = mNetworkForNetId.valueAt(i); if (nai.satisfies(nri.request)) { matchingNetworks.add(nai); } } } for (final NetworkAgentInfo nai : matchingNetworks) { final ConnectivityReport report = nai.getConnectivityReport(); if (report == null) { continue; } if (!checkConnectivityDiagnosticsPermissions( nri.mPid, nri.mUid, nai, cbInfo.mCallingPackageName)) { continue; } try { cb.onConnectivityReportAvailable(report); } catch (RemoteException e) { // Exception while sending the ConnectivityReport. Move on to the next network. } } } private void handleUnregisterConnectivityDiagnosticsCallback( @NonNull IConnectivityDiagnosticsCallback cb, int uid) { ensureRunningOnConnectivityServiceThread(); final IBinder iCb = cb.asBinder(); final ConnectivityDiagnosticsCallbackInfo cbInfo = mConnectivityDiagnosticsCallbacks.remove(iCb); if (cbInfo == null) { if (VDBG) log("Removing diagnostics callback that is not currently registered"); return; } final NetworkRequestInfo nri = cbInfo.mRequestInfo; if (uid != nri.mUid) { if (VDBG) loge("Different uid than registrant attempting to unregister cb"); return; } // Decrement the reference count for this NetworkRequestInfo. The reference count is // incremented when the NetworkRequestInfo is created as part of // enforceRequestCountLimit(). decrementNetworkRequestPerUidCount(nri); iCb.unlinkToDeath(cbInfo, 0); } private void handleNetworkTestedWithExtras( @NonNull ConnectivityReportEvent reportEvent, @NonNull PersistableBundle extras) { final NetworkAgentInfo nai = reportEvent.mNai; final NetworkCapabilities networkCapabilities = getNetworkCapabilitiesWithoutUids(nai.networkCapabilities); final ConnectivityReport report = new ConnectivityReport( reportEvent.mNai.network, reportEvent.mTimestampMillis, nai.linkProperties, networkCapabilities, extras); nai.setConnectivityReport(report); final List results = getMatchingPermissionedCallbacks(nai); for (final IConnectivityDiagnosticsCallback cb : results) { try { cb.onConnectivityReportAvailable(report); } catch (RemoteException ex) { loge("Error invoking onConnectivityReport", ex); } } } private void handleDataStallSuspected( @NonNull NetworkAgentInfo nai, long timestampMillis, int detectionMethod, @NonNull PersistableBundle extras) { final NetworkCapabilities networkCapabilities = getNetworkCapabilitiesWithoutUids(nai.networkCapabilities); final DataStallReport report = new DataStallReport( nai.network, timestampMillis, detectionMethod, nai.linkProperties, networkCapabilities, extras); final List results = getMatchingPermissionedCallbacks(nai); for (final IConnectivityDiagnosticsCallback cb : results) { try { cb.onDataStallSuspected(report); } catch (RemoteException ex) { loge("Error invoking onDataStallSuspected", ex); } } } private void handleNetworkConnectivityReported( @NonNull NetworkAgentInfo nai, boolean connectivity) { final List results = getMatchingPermissionedCallbacks(nai); for (final IConnectivityDiagnosticsCallback cb : results) { try { cb.onNetworkConnectivityReported(nai.network, connectivity); } catch (RemoteException ex) { loge("Error invoking onNetworkConnectivityReported", ex); } } } private NetworkCapabilities getNetworkCapabilitiesWithoutUids(@NonNull NetworkCapabilities nc) { final NetworkCapabilities sanitized = new NetworkCapabilities(nc); sanitized.setUids(null); sanitized.setAdministratorUids(new int[0]); sanitized.setOwnerUid(Process.INVALID_UID); return sanitized; } private List getMatchingPermissionedCallbacks( @NonNull NetworkAgentInfo nai) { final List results = new ArrayList<>(); for (Entry entry : mConnectivityDiagnosticsCallbacks.entrySet()) { final ConnectivityDiagnosticsCallbackInfo cbInfo = entry.getValue(); final NetworkRequestInfo nri = cbInfo.mRequestInfo; if (nai.satisfies(nri.request)) { if (checkConnectivityDiagnosticsPermissions( nri.mPid, nri.mUid, nai, cbInfo.mCallingPackageName)) { results.add(entry.getValue().mCb); } } } return results; } @VisibleForTesting boolean checkConnectivityDiagnosticsPermissions( int callbackPid, int callbackUid, NetworkAgentInfo nai, String callbackPackageName) { if (checkNetworkStackPermission(callbackPid, callbackUid)) { return true; } // LocationPermissionChecker#checkLocationPermission can throw SecurityException if the uid // and package name don't match. Throwing on the CS thread is not acceptable, so wrap the // call in a try-catch. try { if (!mLocationPermissionChecker.checkLocationPermission( callbackPackageName, null /* featureId */, callbackUid, null /* message */)) { return false; } } catch (SecurityException e) { return false; } final Network[] underlyingNetworks; synchronized (mVpns) { final Vpn vpn = getVpnIfOwner(callbackUid); underlyingNetworks = (vpn == null) ? null : vpn.getUnderlyingNetworks(); } if (underlyingNetworks != null) { if (Arrays.asList(underlyingNetworks).contains(nai.network)) return true; } // Administrator UIDs also contains the Owner UID final int[] administratorUids = nai.networkCapabilities.getAdministratorUids(); return ArrayUtils.contains(administratorUids, callbackUid); } @Override public void registerConnectivityDiagnosticsCallback( @NonNull IConnectivityDiagnosticsCallback callback, @NonNull NetworkRequest request, @NonNull String callingPackageName) { if (request.legacyType != TYPE_NONE) { throw new IllegalArgumentException("ConnectivityManager.TYPE_* are deprecated." + " Please use NetworkCapabilities instead."); } final int callingUid = Binder.getCallingUid(); mAppOpsManager.checkPackage(callingUid, callingPackageName); // This NetworkCapabilities is only used for matching to Networks. Clear out its owner uid // and administrator uids to be safe. final NetworkCapabilities nc = new NetworkCapabilities(request.networkCapabilities); restrictRequestUidsForCallerAndSetRequestorInfo(nc, callingUid, callingPackageName); final NetworkRequest requestWithId = new NetworkRequest( nc, TYPE_NONE, nextNetworkRequestId(), NetworkRequest.Type.LISTEN); // NetworkRequestInfos created here count towards MAX_NETWORK_REQUESTS_PER_UID limit. // // nri is not bound to the death of callback. Instead, callback.bindToDeath() is set in // handleRegisterConnectivityDiagnosticsCallback(). nri will be cleaned up as part of the // callback's binder death. final NetworkRequestInfo nri = new NetworkRequestInfo(requestWithId); final ConnectivityDiagnosticsCallbackInfo cbInfo = new ConnectivityDiagnosticsCallbackInfo(callback, nri, callingPackageName); mConnectivityDiagnosticsHandler.sendMessage( mConnectivityDiagnosticsHandler.obtainMessage( ConnectivityDiagnosticsHandler .EVENT_REGISTER_CONNECTIVITY_DIAGNOSTICS_CALLBACK, cbInfo)); } @Override public void unregisterConnectivityDiagnosticsCallback( @NonNull IConnectivityDiagnosticsCallback callback) { mConnectivityDiagnosticsHandler.sendMessage( mConnectivityDiagnosticsHandler.obtainMessage( ConnectivityDiagnosticsHandler .EVENT_UNREGISTER_CONNECTIVITY_DIAGNOSTICS_CALLBACK, Binder.getCallingUid(), 0, callback)); } @Override public void simulateDataStall(int detectionMethod, long timestampMillis, @NonNull Network network, @NonNull PersistableBundle extras) { enforceAnyPermissionOf(android.Manifest.permission.MANAGE_TEST_NETWORKS, android.Manifest.permission.NETWORK_STACK); final NetworkCapabilities nc = getNetworkCapabilitiesInternal(network); if (!nc.hasTransport(TRANSPORT_TEST)) { throw new SecurityException("Data Stall simluation is only possible for test networks"); } final NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network); if (nai == null || nai.creatorUid != Binder.getCallingUid()) { throw new SecurityException("Data Stall simulation is only possible for network " + "creators"); } // Instead of passing the data stall directly to the ConnectivityDiagnostics handler, treat // this as a Data Stall received directly from NetworkMonitor. This requires wrapping the // Data Stall information as a DataStallReportParcelable and passing to // #notifyDataStallSuspected. This ensures that unknown Data Stall detection methods are // still passed to ConnectivityDiagnostics (with new detection methods masked). final DataStallReportParcelable p = new DataStallReportParcelable(); p.timestampMillis = timestampMillis; p.detectionMethod = detectionMethod; if (hasDataStallDetectionMethod(p, DETECTION_METHOD_DNS_EVENTS)) { p.dnsConsecutiveTimeouts = extras.getInt(KEY_DNS_CONSECUTIVE_TIMEOUTS); } if (hasDataStallDetectionMethod(p, DETECTION_METHOD_TCP_METRICS)) { p.tcpPacketFailRate = extras.getInt(KEY_TCP_PACKET_FAIL_RATE); p.tcpMetricsCollectionPeriodMillis = extras.getInt( KEY_TCP_METRICS_COLLECTION_PERIOD_MILLIS); } notifyDataStallSuspected(p, network.netId); } }