Nat464Xlat: clat management cleanup (6f62b739) · Commits · e / os / android_frameworks_base

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

+25 −10

Original line number	Diff line number	Diff line
		@@ -2269,7 +2269,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
		}
		nai.networkMonitor.sendMessage(NetworkMonitor.CMD_NETWORK_DISCONNECTED);
		mNetworkAgentInfos.remove(msg.replyTo);
		updateClat(null, nai.linkProperties, nai);
		maybeStopClat(nai);
		synchronized (mNetworkForNetId) {
		// Remove the NetworkAgent, but don't mark the netId as
		// available until we've told netd to delete it below.
		@@ -4382,7 +4382,8 @@ public class ConnectivityService extends IConnectivityManager.Stub
		updateRoutes(newLp, oldLp, netId);
		updateDnses(newLp, oldLp, netId);

		updateClat(newLp, oldLp, networkAgent);
		// Start or stop clat accordingly to network state.
		updateClat(networkAgent);
		if (isDefaultNetwork(networkAgent)) {
		handleApplyDefaultProxy(newLp.getHttpProxy());
		} else {
		@@ -4397,16 +4398,30 @@ public class ConnectivityService extends IConnectivityManager.Stub
		mKeepaliveTracker.handleCheckKeepalivesStillValid(networkAgent);
		}

		private void updateClat(LinkProperties newLp, LinkProperties oldLp, NetworkAgentInfo nai) {
		final boolean wasRunningClat = nai.clatd != null && nai.clatd.isStarted();
		final boolean shouldRunClat = Nat464Xlat.requiresClat(nai);
		private void updateClat(NetworkAgentInfo nai) {
		if (Nat464Xlat.requiresClat(nai)) {
		maybeStartClat(nai);
		} else {
		maybeStopClat(nai);
		}
		}

		if (!wasRunningClat && shouldRunClat) {
		nai.clatd = new Nat464Xlat(mContext, mNetd, mTrackerHandler, nai);
		/** Ensure clat has started for this network. */
		private void maybeStartClat(NetworkAgentInfo nai) {
		if (nai.clatd != null && nai.clatd.isStarted()) {
		return;
		}
		nai.clatd = new Nat464Xlat(mNetd, mTrackerHandler, nai);
		nai.clatd.start();
		} else if (wasRunningClat && !shouldRunClat) {
		nai.clatd.stop();
		}

		/** Ensure clat has stopped for this network. */
		private void maybeStopClat(NetworkAgentInfo nai) {
		if (nai.clatd == null) {
		return;
		}
		nai.clatd.stop();
		nai.clatd = null;
		}

		private void wakeupModifyInterface(String iface, NetworkCapabilities caps, boolean add) {

services/core/java/com/android/server/connectivity/Nat464Xlat.java

+17 −12

Original line number	Diff line number	Diff line
		@@ -18,7 +18,6 @@ package com.android.server.connectivity;

		import java.net.Inet4Address;

		import android.content.Context;
		import android.net.InterfaceConfiguration;
		import android.net.ConnectivityManager;
		import android.net.LinkAddress;
		@@ -35,17 +34,18 @@ import com.android.server.net.BaseNetworkObserver;
		import com.android.internal.util.ArrayUtils;

		/**
		* @hide
		*
		* Class to manage a 464xlat CLAT daemon.
		*
		* @hide
		*/
		public class Nat464Xlat extends BaseNetworkObserver {
		private static final String TAG = "Nat464Xlat";
		private static final String TAG = Nat464Xlat.class.getSimpleName();

		// This must match the interface prefix in clatd.c.
		private static final String CLAT_PREFIX = "v4-";

		// The network types we will start clatd on.
		// The network types we will start clatd on,
		// allowing clat only on networks for which we can support IPv6-only.
		private static final int[] NETWORK_TYPES = {
		ConnectivityManager.TYPE_MOBILE,
		ConnectivityManager.TYPE_WIFI,
		@@ -76,9 +76,7 @@ public class Nat464Xlat extends BaseNetworkObserver {
		private String mIface;
		private boolean mIsRunning;

		public Nat464Xlat(
		Context context, INetworkManagementService nmService,
		Handler handler, NetworkAgentInfo nai) {
		public Nat464Xlat(INetworkManagementService nmService, Handler handler, NetworkAgentInfo nai) {
		mNMService = nmService;
		mHandler = handler;
		mNetwork = nai;
		@@ -90,13 +88,14 @@ public class Nat464Xlat extends BaseNetworkObserver {
		* @return true if the network requires clat, false otherwise.
		*/
		public static boolean requiresClat(NetworkAgentInfo nai) {
		// TODO: migrate to NetworkCapabilities.TRANSPORT_*.
		final int netType = nai.networkInfo.getType();
		final boolean supported = ArrayUtils.contains(NETWORK_TYPES, nai.networkInfo.getType());
		final boolean connected = nai.networkInfo.isConnected();
		// We only run clat on networks that don't have a native IPv4 address.
		final boolean hasIPv4Address =
		(nai.linkProperties != null) ? nai.linkProperties.hasIPv4Address() : false;
		// Only support clat on mobile and wifi for now, because these are the only IPv6-only
		// networks we can connect to.
		return connected && !hasIPv4Address && ArrayUtils.contains(NETWORK_TYPES, netType);
		(nai.linkProperties != null) && nai.linkProperties.hasIPv4Address();
		return supported && connected && !hasIPv4Address;
		}

		/**
		@@ -227,6 +226,7 @@ public class Nat464Xlat extends BaseNetworkObserver {
		}

		private void maybeSetIpv6NdOffload(String iface, boolean on) {
		// TODO: migrate to NetworkCapabilities.TRANSPORT_*.
		if (mNetwork.networkInfo.getType() != ConnectivityManager.TYPE_WIFI) {
		return;
		}
		@@ -286,4 +286,9 @@ public class Nat464Xlat extends BaseNetworkObserver {
		}
		}
		}

		@Override
		public String toString() {
		return "mBaseIface: " + mBaseIface + ", mIface: " + mIface + ", mIsRunning: " + mIsRunning;
		}
		}

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

+2 −2

Original line number	Diff line number	Diff line
		@@ -562,13 +562,13 @@ public class NetworkAgentInfo implements Comparable<NetworkAgentInfo> {
		"acceptUnvalidated{" + networkMisc.acceptUnvalidated + "} " +
		"everCaptivePortalDetected{" + everCaptivePortalDetected + "} " +
		"lastCaptivePortalDetected{" + lastCaptivePortalDetected + "} " +
		"clat{" + clatd + "} " +
		"}";
		}

		public String name() {
		return "NetworkAgentInfo [" + networkInfo.getTypeName() + " (" +
		networkInfo.getSubtypeName() + ") - " +
		(network == null ? "null" : network.toString()) + "]";
		networkInfo.getSubtypeName() + ") - " + Objects.toString(network) + "]";
		}

		// Enables sorting in descending order of score.