| /* |
| * Copyright (C) 2012 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.connectivity; |
| |
| import static android.net.ConnectivityManager.TYPE_MOBILE; |
| |
| import java.net.Inet4Address; |
| |
| import android.content.Context; |
| import android.net.IConnectivityManager; |
| import android.net.InterfaceConfiguration; |
| import android.net.LinkAddress; |
| import android.net.LinkProperties; |
| import android.net.NetworkStateTracker; |
| import android.net.NetworkUtils; |
| import android.net.RouteInfo; |
| import android.os.Handler; |
| import android.os.Message; |
| import android.os.INetworkManagementService; |
| import android.os.RemoteException; |
| import android.util.Slog; |
| |
| import com.android.server.net.BaseNetworkObserver; |
| |
| /** |
| * @hide |
| * |
| * Class to manage a 464xlat CLAT daemon. |
| */ |
| public class Nat464Xlat extends BaseNetworkObserver { |
| private Context mContext; |
| private INetworkManagementService mNMService; |
| private IConnectivityManager mConnService; |
| private NetworkStateTracker mTracker; |
| private Handler mHandler; |
| |
| // Whether we started clatd and expect it to be running. |
| private boolean mIsStarted; |
| // Whether the clatd interface exists (i.e., clatd is running). |
| private boolean mIsRunning; |
| // The LinkProperties of the clat interface. |
| private LinkProperties mLP; |
| |
| // This must match the interface name in clatd.conf. |
| private static final String CLAT_INTERFACE_NAME = "clat4"; |
| |
| private static final String TAG = "Nat464Xlat"; |
| |
| public Nat464Xlat(Context context, INetworkManagementService nmService, |
| IConnectivityManager connService, Handler handler) { |
| mContext = context; |
| mNMService = nmService; |
| mConnService = connService; |
| mHandler = handler; |
| |
| mIsStarted = false; |
| mIsRunning = false; |
| mLP = new LinkProperties(); |
| } |
| |
| /** |
| * Determines whether an interface requires clat. |
| * @param netType the network type (one of the |
| * android.net.ConnectivityManager.TYPE_* constants) |
| * @param tracker the NetworkStateTracker corresponding to the network type. |
| * @return true if the interface requires clat, false otherwise. |
| */ |
| public boolean requiresClat(int netType, NetworkStateTracker tracker) { |
| LinkProperties lp = tracker.getLinkProperties(); |
| // Only support clat on mobile for now. |
| Slog.d(TAG, "requiresClat: netType=" + netType + ", hasIPv4Address=" + |
| lp.hasIPv4Address()); |
| return netType == TYPE_MOBILE && !lp.hasIPv4Address(); |
| } |
| |
| public static boolean isRunningClat(LinkProperties lp) { |
| return lp != null && lp.getAllInterfaceNames().contains(CLAT_INTERFACE_NAME); |
| } |
| |
| /** |
| * Starts the clat daemon. |
| * @param lp The link properties of the interface to start clatd on. |
| */ |
| public void startClat(NetworkStateTracker tracker) { |
| if (mIsStarted) { |
| Slog.e(TAG, "startClat: already started"); |
| return; |
| } |
| mTracker = tracker; |
| LinkProperties lp = mTracker.getLinkProperties(); |
| String iface = lp.getInterfaceName(); |
| Slog.i(TAG, "Starting clatd on " + iface + ", lp=" + lp); |
| try { |
| mNMService.startClatd(iface); |
| } catch(RemoteException e) { |
| Slog.e(TAG, "Error starting clat daemon: " + e); |
| } |
| mIsStarted = true; |
| } |
| |
| /** |
| * Stops the clat daemon. |
| */ |
| public void stopClat() { |
| if (mIsStarted) { |
| Slog.i(TAG, "Stopping clatd"); |
| try { |
| mNMService.stopClatd(); |
| } catch(RemoteException e) { |
| Slog.e(TAG, "Error stopping clat daemon: " + e); |
| } |
| mIsStarted = false; |
| mIsRunning = false; |
| mTracker = null; |
| mLP.clear(); |
| } else { |
| Slog.e(TAG, "stopClat: already stopped"); |
| } |
| } |
| |
| public boolean isStarted() { |
| return mIsStarted; |
| } |
| |
| public boolean isRunning() { |
| return mIsRunning; |
| } |
| |
| @Override |
| public void interfaceAdded(String iface) { |
| if (iface.equals(CLAT_INTERFACE_NAME)) { |
| Slog.i(TAG, "interface " + CLAT_INTERFACE_NAME + |
| " added, mIsRunning = " + mIsRunning + " -> true"); |
| mIsRunning = true; |
| |
| // Get the network configuration of the clat interface, store it |
| // in our link properties, and stack it on top of the interface |
| // it's running on. |
| try { |
| InterfaceConfiguration config = mNMService.getInterfaceConfig(iface); |
| mLP.clear(); |
| mLP.setInterfaceName(iface); |
| RouteInfo ipv4Default = new RouteInfo(new LinkAddress(Inet4Address.ANY, 0), null, |
| iface); |
| mLP.addRoute(ipv4Default); |
| mLP.addLinkAddress(config.getLinkAddress()); |
| mTracker.addStackedLink(mLP); |
| Slog.i(TAG, "Adding stacked link. tracker LP: " + |
| mTracker.getLinkProperties()); |
| } catch(RemoteException e) { |
| Slog.e(TAG, "Error getting link properties: " + e); |
| } |
| |
| // Inform ConnectivityService that things have changed. |
| Message msg = mHandler.obtainMessage( |
| NetworkStateTracker.EVENT_CONFIGURATION_CHANGED, |
| mTracker.getNetworkInfo()); |
| Slog.i(TAG, "sending message to ConnectivityService: " + msg); |
| msg.sendToTarget(); |
| } |
| } |
| |
| @Override |
| public void interfaceRemoved(String iface) { |
| if (iface == CLAT_INTERFACE_NAME) { |
| if (mIsRunning) { |
| NetworkUtils.resetConnections( |
| CLAT_INTERFACE_NAME, |
| NetworkUtils.RESET_IPV4_ADDRESSES); |
| } |
| Slog.i(TAG, "interface " + CLAT_INTERFACE_NAME + |
| " removed, mIsRunning = " + mIsRunning + " -> false"); |
| mIsRunning = false; |
| mTracker.removeStackedLink(mLP); |
| mLP.clear(); |
| Slog.i(TAG, "mLP = " + mLP); |
| } |
| } |
| }; |