113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti/* 213c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * Copyright (C) 2012 The Android Open Source Project 313c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * 413c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * Licensed under the Apache License, Version 2.0 (the "License"); 513c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * you may not use this file except in compliance with the License. 613c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * You may obtain a copy of the License at 713c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * 813c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * http://www.apache.org/licenses/LICENSE-2.0 913c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * 1013c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * Unless required by applicable law or agreed to in writing, software 1113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * distributed under the License is distributed on an "AS IS" BASIS, 1213c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1313c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * See the License for the specific language governing permissions and 1413c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * limitations under the License. 1513c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti */ 1613c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 1713c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittipackage com.android.server.connectivity; 1813c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 1913c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport java.net.Inet4Address; 2013c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 2113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport android.content.Context; 2213c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport android.net.InterfaceConfiguration; 23853d741ce739e0562e8b5386b8165e3d560fe7d4Lorenzo Colittiimport android.net.ConnectivityManager; 2413c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport android.net.LinkAddress; 2513c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport android.net.LinkProperties; 263b75982e39ed9370153ae7f238f1d6041b9506edPaul Jensenimport android.net.NetworkAgent; 2713c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport android.net.RouteInfo; 2813c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport android.os.Handler; 2913c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport android.os.Message; 3013c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport android.os.INetworkManagementService; 3113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport android.os.RemoteException; 3213c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport android.util.Slog; 3313c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 3413c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittiimport com.android.server.net.BaseNetworkObserver; 35853d741ce739e0562e8b5386b8165e3d560fe7d4Lorenzo Colittiimport com.android.internal.util.ArrayUtils; 3613c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 3713c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti/** 3813c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * @hide 3913c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * 4013c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti * Class to manage a 464xlat CLAT daemon. 4113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti */ 4213c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colittipublic class Nat464Xlat extends BaseNetworkObserver { 43954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti private static final String TAG = "Nat464Xlat"; 44954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 45954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // This must match the interface prefix in clatd.c. 46954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti private static final String CLAT_PREFIX = "v4-"; 47954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 48853d741ce739e0562e8b5386b8165e3d560fe7d4Lorenzo Colitti // The network types we will start clatd on. 49853d741ce739e0562e8b5386b8165e3d560fe7d4Lorenzo Colitti private static final int[] NETWORK_TYPES = { 50853d741ce739e0562e8b5386b8165e3d560fe7d4Lorenzo Colitti ConnectivityManager.TYPE_MOBILE, 51853d741ce739e0562e8b5386b8165e3d560fe7d4Lorenzo Colitti ConnectivityManager.TYPE_WIFI, 52853d741ce739e0562e8b5386b8165e3d560fe7d4Lorenzo Colitti ConnectivityManager.TYPE_ETHERNET, 53853d741ce739e0562e8b5386b8165e3d560fe7d4Lorenzo Colitti }; 54853d741ce739e0562e8b5386b8165e3d560fe7d4Lorenzo Colitti 55954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti private final INetworkManagementService mNMService; 56954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 573b75982e39ed9370153ae7f238f1d6041b9506edPaul Jensen // ConnectivityService Handler for LinkProperties updates. 58954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti private final Handler mHandler; 5913c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 60e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti // The network we're running on, and its type. 61954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti private final NetworkAgentInfo mNetwork; 6213c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 63954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // Internal state variables. 64954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // 65954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // The possible states are: 66954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // - Idle: start() not called. Everything is null. 67954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // - Starting: start() called. Interfaces are non-null. isStarted() returns true. 68954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // mIsRunning is false. 697f6c0d7d2d5ad9e9f316300ce06f27d8492b05cdLorenzo Colitti // - Running: start() called, and interfaceLinkStateChanged() told us that mIface is up. 707f6c0d7d2d5ad9e9f316300ce06f27d8492b05cdLorenzo Colitti // mIsRunning is true. 71954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // 72954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // Once mIface is non-null and isStarted() is true, methods called by ConnectivityService on 73954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // its handler thread must not modify any internal state variables; they are only updated by the 74954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // interface observers, called on the notification threads. 75954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti private String mBaseIface; 76954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti private String mIface; 77954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti private boolean mIsRunning; 7813c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 79954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti public Nat464Xlat( 80954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Context context, INetworkManagementService nmService, 81954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Handler handler, NetworkAgentInfo nai) { 8213c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti mNMService = nmService; 8313c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti mHandler = handler; 84954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mNetwork = nai; 8513c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 8613c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 8713c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti /** 883b75982e39ed9370153ae7f238f1d6041b9506edPaul Jensen * Determines whether a network requires clat. 893b75982e39ed9370153ae7f238f1d6041b9506edPaul Jensen * @param network the NetworkAgentInfo corresponding to the network. 903b75982e39ed9370153ae7f238f1d6041b9506edPaul Jensen * @return true if the network requires clat, false otherwise. 9113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti */ 921df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti public static boolean requiresClat(NetworkAgentInfo nai) { 931df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti final int netType = nai.networkInfo.getType(); 941df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti final boolean connected = nai.networkInfo.isConnected(); 951df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti final boolean hasIPv4Address = 961df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti (nai.linkProperties != null) ? nai.linkProperties.hasIPv4Address() : false; 97dc6690867bbe839bbabddd9d7d5e4ec887a2bfeeLorenzo Colitti // Only support clat on mobile and wifi for now, because these are the only IPv6-only 98dc6690867bbe839bbabddd9d7d5e4ec887a2bfeeLorenzo Colitti // networks we can connect to. 99853d741ce739e0562e8b5386b8165e3d560fe7d4Lorenzo Colitti return connected && !hasIPv4Address && ArrayUtils.contains(NETWORK_TYPES, netType); 10013c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 10113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 102954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti /** 103954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti * Determines whether clatd is started. Always true, except a) if start has not yet been called, 104954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti * or b) if our interface was removed. 105954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti */ 106954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti public boolean isStarted() { 107954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti return mIface != null; 108954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti } 109954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 110954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti /** 111954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti * Clears internal state. Must not be called by ConnectivityService. 112954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti */ 113954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti private void clear() { 114954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mIface = null; 115954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mBaseIface = null; 116954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mIsRunning = false; 117d2ef1e50c491239e43c7b557ea1f7fc03e84f8f9Lorenzo Colitti } 118d2ef1e50c491239e43c7b557ea1f7fc03e84f8f9Lorenzo Colitti 11913c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti /** 120954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti * Starts the clat daemon. Called by ConnectivityService on the handler thread. 12113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti */ 122954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti public void start() { 123954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti if (isStarted()) { 124954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Slog.e(TAG, "startClat: already started"); 1253b75982e39ed9370153ae7f238f1d6041b9506edPaul Jensen return; 1263b75982e39ed9370153ae7f238f1d6041b9506edPaul Jensen } 127954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 128954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti if (mNetwork.linkProperties == null) { 129954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Slog.e(TAG, "startClat: Can't start clat with null LinkProperties"); 13013c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti return; 13113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 132954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 13313c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti try { 134954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mNMService.registerObserver(this); 13513c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } catch(RemoteException e) { 136954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Slog.e(TAG, "startClat: Can't register interface observer for clat on " + mNetwork); 137954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti return; 138954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti } 139954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 140954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mBaseIface = mNetwork.linkProperties.getInterfaceName(); 141954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti if (mBaseIface == null) { 142954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Slog.e(TAG, "startClat: Can't start clat on null interface"); 143954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti return; 144954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti } 145954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mIface = CLAT_PREFIX + mBaseIface; 146954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // From now on, isStarted() will return true. 147954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 148954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Slog.i(TAG, "Starting clatd on " + mBaseIface); 149954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti try { 150954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mNMService.startClatd(mBaseIface); 151954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti } catch(RemoteException|IllegalStateException e) { 152954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Slog.e(TAG, "Error starting clatd: " + e); 15313c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 15413c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 15513c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 15613c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti /** 157954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti * Stops the clat daemon. Called by ConnectivityService on the handler thread. 15813c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti */ 159954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti public void stop() { 160954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti if (isStarted()) { 16113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti Slog.i(TAG, "Stopping clatd"); 16213c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti try { 163954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mNMService.stopClatd(mBaseIface); 164954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti } catch(RemoteException|IllegalStateException e) { 165954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Slog.e(TAG, "Error stopping clatd: " + e); 16613c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 167954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // When clatd stops and its interface is deleted, interfaceRemoved() will notify 168954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // ConnectivityService and call clear(). 16913c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } else { 170954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Slog.e(TAG, "clatd: already stopped"); 17113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 17213c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 17313c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 174954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti private void updateConnectivityService(LinkProperties lp) { 175954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Message msg = mHandler.obtainMessage(NetworkAgent.EVENT_NETWORK_PROPERTIES_CHANGED, lp); 176954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti msg.replyTo = mNetwork.messenger; 1773b75982e39ed9370153ae7f238f1d6041b9506edPaul Jensen Slog.i(TAG, "sending message to ConnectivityService: " + msg); 1783b75982e39ed9370153ae7f238f1d6041b9506edPaul Jensen msg.sendToTarget(); 1793b75982e39ed9370153ae7f238f1d6041b9506edPaul Jensen } 1803b75982e39ed9370153ae7f238f1d6041b9506edPaul Jensen 181954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti /** 182954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti * Copies the stacked clat link in oldLp, if any, to the LinkProperties in mNetwork. 183954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti * This is necessary because the LinkProperties in mNetwork come from the transport layer, which 184954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti * has no idea that 464xlat is running on top of it. 185954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti */ 186954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti public void fixupLinkProperties(LinkProperties oldLp) { 187954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti if (mNetwork.clatd != null && 188954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mIsRunning && 189954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mNetwork.linkProperties != null && 190954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti !mNetwork.linkProperties.getAllInterfaceNames().contains(mIface)) { 191954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Slog.d(TAG, "clatd running, updating NAI for " + mIface); 1921df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti for (LinkProperties stacked: oldLp.getStackedLinks()) { 193954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti if (mIface.equals(stacked.getInterfaceName())) { 194954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mNetwork.linkProperties.addStackedLink(stacked); 1951df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti break; 1961df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti } 1971df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti } 1981df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti } 1991df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti } 2001df5fa55c5a5c1ba054b783ea639c99d57c357cfLorenzo Colitti 201954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti private LinkProperties makeLinkProperties(LinkAddress clatAddress) { 202954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti LinkProperties stacked = new LinkProperties(); 203954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti stacked.setInterfaceName(mIface); 204954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 205954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // Although the clat interface is a point-to-point tunnel, we don't 206954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // point the route directly at the interface because some apps don't 207954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // understand routes without gateways (see, e.g., http://b/9597256 208954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // http://b/9597516). Instead, set the next hop of the route to the 209954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // clat IPv4 address itself (for those apps, it doesn't matter what 210954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // the IP of the gateway is, only that there is one). 211954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti RouteInfo ipv4Default = new RouteInfo( 212954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti new LinkAddress(Inet4Address.ANY, 0), 213954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti clatAddress.getAddress(), mIface); 214954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti stacked.addRoute(ipv4Default); 215954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti stacked.addLinkAddress(clatAddress); 216954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti return stacked; 217954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti } 218954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 219e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti private LinkAddress getLinkAddress(String iface) { 220e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti try { 221e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti InterfaceConfiguration config = mNMService.getInterfaceConfig(iface); 222e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti return config.getLinkAddress(); 223e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti } catch(RemoteException|IllegalStateException e) { 224e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti Slog.e(TAG, "Error getting link properties: " + e); 225e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti return null; 226e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti } 227e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti } 228e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti 229e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti private void maybeSetIpv6NdOffload(String iface, boolean on) { 230853d741ce739e0562e8b5386b8165e3d560fe7d4Lorenzo Colitti if (mNetwork.networkInfo.getType() != ConnectivityManager.TYPE_WIFI) { 231e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti return; 232e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti } 233e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti try { 234e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti Slog.d(TAG, (on ? "En" : "Dis") + "abling ND offload on " + iface); 235e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti mNMService.setInterfaceIpv6NdOffload(iface, on); 236e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti } catch(RemoteException|IllegalStateException e) { 237e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti Slog.w(TAG, "Changing IPv6 ND offload on " + iface + "failed: " + e); 238e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti } 239e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti } 240e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti 24113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti @Override 2427f6c0d7d2d5ad9e9f316300ce06f27d8492b05cdLorenzo Colitti public void interfaceLinkStateChanged(String iface, boolean up) { 243954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // Called by the InterfaceObserver on its own thread, so can race with stop(). 2447f6c0d7d2d5ad9e9f316300ce06f27d8492b05cdLorenzo Colitti if (isStarted() && up && mIface.equals(iface)) { 2457f6c0d7d2d5ad9e9f316300ce06f27d8492b05cdLorenzo Colitti Slog.i(TAG, "interface " + iface + " is up, mIsRunning " + mIsRunning + "->true"); 246954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 247954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti if (!mIsRunning) { 248e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti LinkAddress clatAddress = getLinkAddress(iface); 249e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti if (clatAddress == null) { 250e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti return; 251e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti } 252954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mIsRunning = true; 253e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti maybeSetIpv6NdOffload(mBaseIface, false); 254954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti LinkProperties lp = new LinkProperties(mNetwork.linkProperties); 255954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti lp.addStackedLink(makeLinkProperties(clatAddress)); 256954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Slog.i(TAG, "Adding stacked link " + mIface + " on top of " + mBaseIface); 257954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti updateConnectivityService(lp); 25813c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 25913c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 26013c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 26113c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti 26213c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti @Override 26313c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti public void interfaceRemoved(String iface) { 264954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti if (isStarted() && mIface.equals(iface)) { 265954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti Slog.i(TAG, "interface " + iface + " removed, mIsRunning " + mIsRunning + "->false"); 266954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti 26713c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti if (mIsRunning) { 268954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // The interface going away likely means clatd has crashed. Ask netd to stop it, 269954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // because otherwise when we try to start it again on the same base interface netd 270954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // will complain that it's already started. 271954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // 272954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // Note that this method can be called by the interface observer at the same time 273954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // that ConnectivityService calls stop(). In this case, the second call to 274954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // stopClatd() will just throw IllegalStateException, which we'll ignore. 275954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti try { 276954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mNMService.unregisterObserver(this); 277954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti mNMService.stopClatd(mBaseIface); 278954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti } catch (RemoteException|IllegalStateException e) { 279954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti // Well, we tried. 280954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti } 281e21a26b3ba78b0238f4ed4a09b43319a2320fbaaLorenzo Colitti maybeSetIpv6NdOffload(mBaseIface, true); 282954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti LinkProperties lp = new LinkProperties(mNetwork.linkProperties); 283954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti lp.removeStackedLink(mIface); 284954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti clear(); 285954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti updateConnectivityService(lp); 28613c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 28713c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 28813c9fdefdec907aaa339ffd67c0ded116cccba01Lorenzo Colitti } 289954394653dad05838235f48244a4320893e0f0cfLorenzo Colitti} 290