Move NetworkStack to services.net (310da6f0) · Commits · e / os / android_frameworks_base

core/java/android/app/SystemServiceRegistry.java

+0 −8

Original line number	Diff line number	Diff line
		@@ -107,7 +107,6 @@ import android.net.IpMemoryStore;
		import android.net.IpSecManager;
		import android.net.NetworkPolicyManager;
		import android.net.NetworkScoreManager;
		import android.net.NetworkStack;
		import android.net.NetworkWatchlistManager;
		import android.net.lowpan.ILowpanManager;
		import android.net.lowpan.LowpanManager;
		@@ -338,13 +337,6 @@ final class SystemServiceRegistry {
		}
		});

		registerService(Context.NETWORK_STACK_SERVICE, NetworkStack.class,
		new StaticServiceFetcher<NetworkStack>() {
		@Override
		public NetworkStack createService() {
		return new NetworkStack();
		}});

		registerService(Context.IP_MEMORY_STORE_SERVICE, IpMemoryStore.class,
		new CachedServiceFetcher<IpMemoryStore>() {
		@Override

core/java/android/content/Context.java

+3 −5

Original line number	Diff line number	Diff line
		@@ -49,7 +49,6 @@ import android.database.sqlite.SQLiteDatabase;
		import android.database.sqlite.SQLiteDatabase.CursorFactory;
		import android.graphics.Bitmap;
		import android.graphics.drawable.Drawable;
		import android.net.NetworkStack;
		import android.net.Uri;
		import android.os.Build;
		import android.os.Bundle;
		@@ -3647,11 +3646,10 @@ public abstract class Context {
		public static final String NETD_SERVICE = "netd";

		/**
		* Use with {@link #getSystemService(String)} to retrieve a
		* {@link NetworkStack} for communicating with the network stack
		* Use with {@link android.os.ServiceManager.getService()} to retrieve a
		* {@link NetworkStackClient} IBinder for communicating with the network stack
		* @hide
		* @see #getSystemService(String)
		* @see NetworkStack
		* @see NetworkStackClient
		*/
		public static final String NETWORK_STACK_SERVICE = "network_stack";

core/java/android/net/NetworkStack.java

+3 −262

Original line number	Diff line number	Diff line
		@@ -15,46 +15,17 @@
		*/
		package android.net;

		import static android.content.pm.PackageManager.PERMISSION_GRANTED;
		import static android.os.IServiceManager.DUMP_FLAG_PRIORITY_HIGH;
		import static android.os.IServiceManager.DUMP_FLAG_PRIORITY_NORMAL;

		import android.annotation.NonNull;
		import android.annotation.Nullable;
		import android.annotation.SystemApi;
		import android.annotation.SystemService;
		import android.annotation.TestApi;
		import android.content.ComponentName;
		import android.content.Context;
		import android.content.Intent;
		import android.content.ServiceConnection;
		import android.content.pm.PackageManager;
		import android.net.dhcp.DhcpServingParamsParcel;
		import android.net.dhcp.IDhcpServerCallbacks;
		import android.net.ip.IIpClientCallbacks;
		import android.os.Binder;
		import android.os.IBinder;
		import android.os.Process;
		import android.os.RemoteException;
		import android.os.ServiceManager;
		import android.os.UserHandle;
		import android.util.Slog;

		import com.android.internal.annotations.GuardedBy;

		import java.lang.reflect.InvocationTargetException;
		import java.util.ArrayList;

		/**
		* Service used to communicate with the network stack, which is running in a separate module.
		*
		* Constants for client code communicating with the network stack service.
		* @hide
		*/
		@SystemService(Context.NETWORK_STACK_SERVICE)
		@SystemApi
		@TestApi
		public class NetworkStack {
		private static final String TAG = NetworkStack.class.getSimpleName();

		/**
		* Permission granted only to the NetworkStack APK, defined in NetworkStackStub with signature
		* protection level.
		@@ -65,235 +36,5 @@ public class NetworkStack {
		public static final String PERMISSION_MAINLINE_NETWORK_STACK =
		"android.permission.MAINLINE_NETWORK_STACK";

		private static final int NETWORKSTACK_TIMEOUT_MS = 10_000;

		@NonNull
		@GuardedBy("mPendingNetStackRequests")
		private final ArrayList<NetworkStackCallback> mPendingNetStackRequests = new ArrayList<>();
		@Nullable
		@GuardedBy("mPendingNetStackRequests")
		private INetworkStackConnector mConnector;

		private volatile boolean mNetworkStackStartRequested = false;

		private interface NetworkStackCallback {
		void onNetworkStackConnected(INetworkStackConnector connector);
		}

		/** @hide */
		public NetworkStack() { }

		/**
		* Create a DHCP server according to the specified parameters.
		*
		* <p>The server will be returned asynchronously through the provided callbacks.
		* @hide
		*/
		public void makeDhcpServer(final String ifName, final DhcpServingParamsParcel params,
		final IDhcpServerCallbacks cb) {
		requestConnector(connector -> {
		try {
		connector.makeDhcpServer(ifName, params, cb);
		} catch (RemoteException e) {
		e.rethrowFromSystemServer();
		}
		});
		}

		/**
		* Create an IpClient on the specified interface.
		*
		* <p>The IpClient will be returned asynchronously through the provided callbacks.
		* @hide
		*/
		public void makeIpClient(String ifName, IIpClientCallbacks cb) {
		requestConnector(connector -> {
		try {
		connector.makeIpClient(ifName, cb);
		} catch (RemoteException e) {
		e.rethrowFromSystemServer();
		}
		});
		}

		/**
		* Create a NetworkMonitor.
		*
		* <p>The INetworkMonitor will be returned asynchronously through the provided callbacks.
		* @hide
		*/
		public void makeNetworkMonitor(
		NetworkParcelable network, String name, INetworkMonitorCallbacks cb) {
		requestConnector(connector -> {
		try {
		connector.makeNetworkMonitor(network, name, cb);
		} catch (RemoteException e) {
		e.rethrowFromSystemServer();
		}
		});
		}

		private class NetworkStackConnection implements ServiceConnection {
		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
		registerNetworkStackService(service);
		}

		@Override
		public void onServiceDisconnected(ComponentName name) {
		// TODO: crash/reboot the system ?
		Slog.wtf(TAG, "Lost network stack connector");
		}
		};

		private void registerNetworkStackService(@NonNull IBinder service) {
		final INetworkStackConnector connector = INetworkStackConnector.Stub.asInterface(service);

		ServiceManager.addService(Context.NETWORK_STACK_SERVICE, service, false /* allowIsolated */,
		DUMP_FLAG_PRIORITY_HIGH \| DUMP_FLAG_PRIORITY_NORMAL);

		final ArrayList<NetworkStackCallback> requests;
		synchronized (mPendingNetStackRequests) {
		requests = new ArrayList<>(mPendingNetStackRequests);
		mPendingNetStackRequests.clear();
		mConnector = connector;
		}

		for (NetworkStackCallback r : requests) {
		r.onNetworkStackConnected(connector);
		}
		}

		/**
		* Start the network stack. Should be called only once on device startup.
		*
		* <p>This method will start the network stack either in the network stack process, or inside
		* the system server on devices that do not support the network stack module. The network stack
		* connector will then be delivered asynchronously to clients that requested it before it was
		* started.
		* @hide
		*/
		public void start(Context context) {
		mNetworkStackStartRequested = true;
		// Try to bind in-process if the library is available
		IBinder connector = null;
		try {
		final Class service = Class.forName(
		"com.android.server.NetworkStackService",
		true /* initialize */,
		context.getClassLoader());
		connector = (IBinder) service.getMethod("makeConnector", Context.class)
		.invoke(null, context);
		} catch (NoSuchMethodException \| IllegalAccessException \| InvocationTargetException e) {
		Slog.wtf(TAG, "Could not create network stack connector from NetworkStackService");
		// TODO: crash/reboot system here ?
		return;
		} catch (ClassNotFoundException e) {
		// Normal behavior if stack is provided by the app: fall through
		}

		// In-process network stack. Add the service to the service manager here.
		if (connector != null) {
		registerNetworkStackService(connector);
		return;
		}
		// Start the network stack process. The service will be added to the service manager in
		// NetworkStackConnection.onServiceConnected().
		final Intent intent = new Intent(INetworkStackConnector.class.getName());
		final ComponentName comp = intent.resolveSystemService(context.getPackageManager(), 0);
		intent.setComponent(comp);

		if (comp == null) {
		Slog.wtf(TAG, "Could not resolve the network stack with " + intent);
		// TODO: crash/reboot system server ?
		return;
		}

		final PackageManager pm = context.getPackageManager();
		int uid = -1;
		try {
		uid = pm.getPackageUid(comp.getPackageName(), UserHandle.USER_SYSTEM);
		} catch (PackageManager.NameNotFoundException e) {
		Slog.wtf("Network stack package not found", e);
		// Fall through
		}

		if (uid != Process.NETWORK_STACK_UID) {
		throw new SecurityException("Invalid network stack UID: " + uid);
		}

		final int hasPermission =
		pm.checkPermission(PERMISSION_MAINLINE_NETWORK_STACK, comp.getPackageName());
		if (hasPermission != PERMISSION_GRANTED) {
		throw new SecurityException(
		"Network stack does not have permission " + PERMISSION_MAINLINE_NETWORK_STACK);
		}

		if (!context.bindServiceAsUser(intent, new NetworkStackConnection(),
		Context.BIND_AUTO_CREATE \| Context.BIND_IMPORTANT, UserHandle.SYSTEM)) {
		Slog.wtf(TAG,
		"Could not bind to network stack in-process, or in app with " + intent);
		// TODO: crash/reboot system server if no network stack after a timeout ?
		}
		}

		/**
		* For non-system server clients, get the connector registered by the system server.
		*/
		private INetworkStackConnector getRemoteConnector() {
		// Block until the NetworkStack connector is registered in ServiceManager.
		// <p>This is only useful for non-system processes that do not have a way to be notified of
		// registration completion. Adding a callback system would be too heavy weight considering
		// that the connector is registered on boot, so it is unlikely that a client would request
		// it before it is registered.
		// TODO: consider blocking boot on registration and simplify much of the logic in this class
		IBinder connector;
		try {
		final long before = System.currentTimeMillis();
		while ((connector = ServiceManager.getService(Context.NETWORK_STACK_SERVICE)) == null) {
		Thread.sleep(20);
		if (System.currentTimeMillis() - before > NETWORKSTACK_TIMEOUT_MS) {
		Slog.e(TAG, "Timeout waiting for NetworkStack connector");
		return null;
		}
		}
		} catch (InterruptedException e) {
		Slog.e(TAG, "Error waiting for NetworkStack connector", e);
		return null;
		}

		return INetworkStackConnector.Stub.asInterface(connector);
		}

		private void requestConnector(@NonNull NetworkStackCallback request) {
		// TODO: PID check.
		final int caller = Binder.getCallingUid();
		if (caller != Process.SYSTEM_UID && !UserHandle.isSameApp(caller, Process.BLUETOOTH_UID)) {
		// Don't even attempt to obtain the connector and give a nice error message
		throw new SecurityException(
		"Only the system server should try to bind to the network stack.");
		}

		if (!mNetworkStackStartRequested) {
		// The network stack is not being started in this process, e.g. this process is not
		// the system server. Get a remote connector registered by the system server.
		final INetworkStackConnector connector = getRemoteConnector();
		synchronized (mPendingNetStackRequests) {
		mConnector = connector;
		}
		request.onNetworkStackConnected(connector);
		return;
		}

		final INetworkStackConnector connector;
		synchronized (mPendingNetStackRequests) {
		connector = mConnector;
		if (connector == null) {
		mPendingNetStackRequests.add(request);
		return;
		}
		}

		request.onNetworkStackConnected(connector);
		}
		private NetworkStack() {}
		}

services/core/java/com/android/server/ConnectivityService.java

+7 −1

Original line number	Diff line number	Diff line
		@@ -88,6 +88,7 @@ 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.NetworkUtils;
		import android.net.NetworkWatchlistManager;
		@@ -5135,7 +5136,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
		if (DBG) log("registerNetworkAgent " + nai);
		final long token = Binder.clearCallingIdentity();
		try {
		mContext.getSystemService(NetworkStack.class).makeNetworkMonitor(
		getNetworkStack().makeNetworkMonitor(
		toStableParcelable(nai.network), name, new NetworkMonitorCallbacks(nai));
		} finally {
		Binder.restoreCallingIdentity(token);
		@@ -5147,6 +5148,11 @@ public class ConnectivityService extends IConnectivityManager.Stub
		return nai.network.netId;
		}

		@VisibleForTesting
		protected NetworkStackClient getNetworkStack() {
		return NetworkStackClient.getInstance();
		}

		private void handleRegisterNetworkAgent(NetworkAgentInfo nai, INetworkMonitor networkMonitor) {
		nai.onNetworkMonitorCreated(networkMonitor);
		if (VDBG) log("Got NetworkAgent Messenger");

services/core/java/com/android/server/connectivity/Tethering.java

+1 −1

Original line number	Diff line number	Diff line
		@@ -1859,7 +1859,7 @@ public class Tethering extends BaseNetworkObserver {
		final TetherState tetherState = new TetherState(
		new IpServer(iface, mLooper, interfaceType, mLog, mNMService, mStatsService,
		makeControlCallback(), mConfig.enableLegacyDhcpServer,
		mDeps.getIpServerDependencies(mContext)));
		mDeps.getIpServerDependencies()));
		mTetherStates.put(iface, tetherState);
		tetherState.ipServer.start();
		}