Lorenzo Colitti | 13c9fde | 2013-03-15 04:22:37 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server.connectivity; |
| 18 | |
| 19 | import static android.net.ConnectivityManager.TYPE_MOBILE; |
| 20 | |
| 21 | import java.net.Inet4Address; |
| 22 | |
| 23 | import android.content.Context; |
| 24 | import android.net.IConnectivityManager; |
| 25 | import android.net.InterfaceConfiguration; |
| 26 | import android.net.LinkAddress; |
| 27 | import android.net.LinkProperties; |
| 28 | import android.net.NetworkStateTracker; |
| 29 | import android.net.NetworkUtils; |
| 30 | import android.net.RouteInfo; |
| 31 | import android.os.Handler; |
| 32 | import android.os.Message; |
| 33 | import android.os.INetworkManagementService; |
| 34 | import android.os.RemoteException; |
| 35 | import android.util.Slog; |
| 36 | |
| 37 | import com.android.server.net.BaseNetworkObserver; |
| 38 | |
| 39 | /** |
| 40 | * @hide |
| 41 | * |
| 42 | * Class to manage a 464xlat CLAT daemon. |
| 43 | */ |
| 44 | public class Nat464Xlat extends BaseNetworkObserver { |
| 45 | private Context mContext; |
| 46 | private INetworkManagementService mNMService; |
| 47 | private IConnectivityManager mConnService; |
| 48 | private NetworkStateTracker mTracker; |
| 49 | private Handler mHandler; |
| 50 | |
| 51 | // Whether we started clatd and expect it to be running. |
| 52 | private boolean mIsStarted; |
| 53 | // Whether the clatd interface exists (i.e., clatd is running). |
| 54 | private boolean mIsRunning; |
| 55 | // The LinkProperties of the clat interface. |
| 56 | private LinkProperties mLP; |
| 57 | |
| 58 | // This must match the interface name in clatd.conf. |
| 59 | private static final String CLAT_INTERFACE_NAME = "clat4"; |
| 60 | |
| 61 | private static final String TAG = "Nat464Xlat"; |
| 62 | |
| 63 | public Nat464Xlat(Context context, INetworkManagementService nmService, |
| 64 | IConnectivityManager connService, Handler handler) { |
| 65 | mContext = context; |
| 66 | mNMService = nmService; |
| 67 | mConnService = connService; |
| 68 | mHandler = handler; |
| 69 | |
| 70 | mIsStarted = false; |
| 71 | mIsRunning = false; |
| 72 | mLP = new LinkProperties(); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Determines whether an interface requires clat. |
| 77 | * @param netType the network type (one of the |
| 78 | * android.net.ConnectivityManager.TYPE_* constants) |
| 79 | * @param tracker the NetworkStateTracker corresponding to the network type. |
| 80 | * @return true if the interface requires clat, false otherwise. |
| 81 | */ |
| 82 | public boolean requiresClat(int netType, NetworkStateTracker tracker) { |
| 83 | LinkProperties lp = tracker.getLinkProperties(); |
| 84 | // Only support clat on mobile for now. |
| 85 | Slog.d(TAG, "requiresClat: netType=" + netType + ", hasIPv4Address=" + |
| 86 | lp.hasIPv4Address()); |
| 87 | return netType == TYPE_MOBILE && !lp.hasIPv4Address(); |
| 88 | } |
| 89 | |
Lorenzo Colitti | d2ef1e5 | 2013-03-28 14:13:43 +0900 | [diff] [blame] | 90 | public static boolean isRunningClat(LinkProperties lp) { |
| 91 | return lp != null && lp.getAllInterfaceNames().contains(CLAT_INTERFACE_NAME); |
| 92 | } |
| 93 | |
Lorenzo Colitti | 13c9fde | 2013-03-15 04:22:37 +0900 | [diff] [blame] | 94 | /** |
| 95 | * Starts the clat daemon. |
| 96 | * @param lp The link properties of the interface to start clatd on. |
| 97 | */ |
| 98 | public void startClat(NetworkStateTracker tracker) { |
| 99 | if (mIsStarted) { |
| 100 | Slog.e(TAG, "startClat: already started"); |
| 101 | return; |
| 102 | } |
| 103 | mTracker = tracker; |
| 104 | LinkProperties lp = mTracker.getLinkProperties(); |
| 105 | String iface = lp.getInterfaceName(); |
| 106 | Slog.i(TAG, "Starting clatd on " + iface + ", lp=" + lp); |
| 107 | try { |
| 108 | mNMService.startClatd(iface); |
| 109 | } catch(RemoteException e) { |
| 110 | Slog.e(TAG, "Error starting clat daemon: " + e); |
| 111 | } |
| 112 | mIsStarted = true; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Stops the clat daemon. |
| 117 | */ |
| 118 | public void stopClat() { |
| 119 | if (mIsStarted) { |
| 120 | Slog.i(TAG, "Stopping clatd"); |
| 121 | try { |
| 122 | mNMService.stopClatd(); |
| 123 | } catch(RemoteException e) { |
| 124 | Slog.e(TAG, "Error stopping clat daemon: " + e); |
| 125 | } |
| 126 | mIsStarted = false; |
| 127 | mIsRunning = false; |
| 128 | mTracker = null; |
| 129 | mLP.clear(); |
| 130 | } else { |
| 131 | Slog.e(TAG, "stopClat: already stopped"); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | public boolean isStarted() { |
| 136 | return mIsStarted; |
| 137 | } |
| 138 | |
| 139 | public boolean isRunning() { |
| 140 | return mIsRunning; |
| 141 | } |
| 142 | |
| 143 | @Override |
| 144 | public void interfaceAdded(String iface) { |
| 145 | if (iface.equals(CLAT_INTERFACE_NAME)) { |
| 146 | Slog.i(TAG, "interface " + CLAT_INTERFACE_NAME + |
| 147 | " added, mIsRunning = " + mIsRunning + " -> true"); |
| 148 | mIsRunning = true; |
| 149 | |
| 150 | // Get the network configuration of the clat interface, store it |
| 151 | // in our link properties, and stack it on top of the interface |
| 152 | // it's running on. |
| 153 | try { |
| 154 | InterfaceConfiguration config = mNMService.getInterfaceConfig(iface); |
| 155 | mLP.clear(); |
| 156 | mLP.setInterfaceName(iface); |
| 157 | RouteInfo ipv4Default = new RouteInfo(new LinkAddress(Inet4Address.ANY, 0), null, |
| 158 | iface); |
| 159 | mLP.addRoute(ipv4Default); |
| 160 | mLP.addLinkAddress(config.getLinkAddress()); |
| 161 | mTracker.addStackedLink(mLP); |
| 162 | Slog.i(TAG, "Adding stacked link. tracker LP: " + |
| 163 | mTracker.getLinkProperties()); |
| 164 | } catch(RemoteException e) { |
| 165 | Slog.e(TAG, "Error getting link properties: " + e); |
| 166 | } |
| 167 | |
| 168 | // Inform ConnectivityService that things have changed. |
| 169 | Message msg = mHandler.obtainMessage( |
| 170 | NetworkStateTracker.EVENT_CONFIGURATION_CHANGED, |
| 171 | mTracker.getNetworkInfo()); |
| 172 | Slog.i(TAG, "sending message to ConnectivityService: " + msg); |
| 173 | msg.sendToTarget(); |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | @Override |
| 178 | public void interfaceRemoved(String iface) { |
| 179 | if (iface == CLAT_INTERFACE_NAME) { |
| 180 | if (mIsRunning) { |
| 181 | NetworkUtils.resetConnections( |
| 182 | CLAT_INTERFACE_NAME, |
| 183 | NetworkUtils.RESET_IPV4_ADDRESSES); |
| 184 | } |
| 185 | Slog.i(TAG, "interface " + CLAT_INTERFACE_NAME + |
| 186 | " removed, mIsRunning = " + mIsRunning + " -> false"); |
| 187 | mIsRunning = false; |
| 188 | mTracker.removeStackedLink(mLP); |
| 189 | mLP.clear(); |
| 190 | Slog.i(TAG, "mLP = " + mLP); |
| 191 | } |
| 192 | } |
| 193 | }; |