am 895b6726: Merge "Only stop/start clatd if necessary." into lmp-dev (1d7142f2) · Commits · e / os / android_frameworks_base

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

+13 −18

Original line number	Diff line number	Diff line
		@@ -4240,13 +4240,17 @@ public class ConnectivityService extends IConnectivityManager.Stub {
		LinkProperties newLp = networkAgent.linkProperties;
		int netId = networkAgent.network.netId;

		// The NetworkAgentInfo does not know whether clatd is running on its network or not. Before
		// we do anything else, make sure its LinkProperties are accurate.
		mClat.fixupLinkProperties(networkAgent, oldLp);

		updateInterfaces(newLp, oldLp, netId);
		updateMtu(newLp, oldLp);
		updateTcpBufferSizes(networkAgent);
		// TODO - figure out what to do for clat
		// for (LinkProperties lp : newLp.getStackedLinks()) {
		// updateMtu(lp, null);
		// }
		updateTcpBufferSizes(networkAgent);
		final boolean flushDns = updateRoutes(newLp, oldLp, netId);
		updateDnses(newLp, oldLp, netId, flushDns);
		updateClat(newLp, oldLp, networkAgent);
		@@ -4254,25 +4258,16 @@ public class ConnectivityService extends IConnectivityManager.Stub {
		}

		private void updateClat(LinkProperties newLp, LinkProperties oldLp, NetworkAgentInfo na) {
		// Update 464xlat state.
		if (mClat.requiresClat(na)) {

		// If the connection was previously using clat, but is not using it now, stop the clat
		// daemon. Normally, this happens automatically when the connection disconnects, but if
		// the disconnect is not reported, or if the connection's LinkProperties changed for
		// some other reason (e.g., handoff changes the IP addresses on the link), it would
		// still be running. If it's not running, then stopping it is a no-op.
		if (Nat464Xlat.isRunningClat(oldLp) && !Nat464Xlat.isRunningClat(newLp)) {
		mClat.stopClat();
		}
		// If the link requires clat to be running, then start the daemon now.
		if (na.networkInfo.isConnected()) {
		final boolean wasRunningClat = mClat.isRunningClat(na);
		final boolean shouldRunClat = Nat464Xlat.requiresClat(na);

		if (!wasRunningClat && shouldRunClat) {
		// Start clatd. If it's already been started but is not running yet, this is a no-op.
		mClat.startClat(na);
		} else {
		} else if (wasRunningClat && !shouldRunClat) {
		mClat.stopClat();
		}
		}
		}

		private void updateInterfaces(LinkProperties newLp, LinkProperties oldLp, int netId) {
		CompareResult<String> interfaceDiff = new CompareResult<String>();

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

+33 −22

Original line number	Diff line number	Diff line
		@@ -89,17 +89,20 @@ public class Nat464Xlat extends BaseNetworkObserver {
		* @param network the NetworkAgentInfo corresponding to the network.
		* @return true if the network requires clat, false otherwise.
		*/
		public boolean requiresClat(NetworkAgentInfo network) {
		int netType = network.networkInfo.getType();
		LinkProperties lp = network.linkProperties;
		public static boolean requiresClat(NetworkAgentInfo nai) {
		final int netType = nai.networkInfo.getType();
		final boolean connected = nai.networkInfo.isConnected();
		final boolean hasIPv4Address =
		(nai.linkProperties != null) ? nai.linkProperties.hasIPv4Address() : false;
		Slog.d(TAG, "requiresClat: netType=" + netType +
		", connected=" + connected +
		", hasIPv4Address=" + hasIPv4Address);
		// Only support clat on mobile for now.
		Slog.d(TAG, "requiresClat: netType=" + netType + ", hasIPv4Address=" +
		lp.hasIPv4Address());
		return netType == TYPE_MOBILE && !lp.hasIPv4Address();
		return netType == TYPE_MOBILE && connected && !hasIPv4Address;
		}

		public static boolean isRunningClat(LinkProperties lp) {
		return lp != null && lp.getAllInterfaceNames().contains(CLAT_INTERFACE_NAME);
		public boolean isRunningClat(NetworkAgentInfo network) {
		return mNetworkMessenger == network.messenger;
		}

		/**
		@@ -149,14 +152,6 @@ public class Nat464Xlat extends BaseNetworkObserver {
		}
		}

		public boolean isStarted() {
		return mIsStarted;
		}

		public boolean isRunning() {
		return mIsRunning;
		}

		private void updateConnectivityService() {
		Message msg = mHandler.obtainMessage(
		NetworkAgent.EVENT_NETWORK_PROPERTIES_CHANGED, mBaseLP);
		@@ -165,6 +160,21 @@ public class Nat464Xlat extends BaseNetworkObserver {
		msg.sendToTarget();
		}

		// Copies the stacked clat link in oldLp, if any, to the LinkProperties in nai.
		public void fixupLinkProperties(NetworkAgentInfo nai, LinkProperties oldLp) {
		if (isRunningClat(nai) &&
		nai.linkProperties != null &&
		!nai.linkProperties.getAllInterfaceNames().contains(CLAT_INTERFACE_NAME)) {
		Slog.d(TAG, "clatd running, updating NAI for " + nai.linkProperties.getInterfaceName());
		for (LinkProperties stacked: oldLp.getStackedLinks()) {
		if (CLAT_INTERFACE_NAME.equals(stacked.getInterfaceName())) {
		nai.linkProperties.addStackedLink(stacked);
		break;
		}
		}
		}
		}

		@Override
		public void interfaceAdded(String iface) {
		if (iface.equals(CLAT_INTERFACE_NAME)) {
		@@ -175,17 +185,18 @@ public class Nat464Xlat extends BaseNetworkObserver {
		// Create the LinkProperties for the clat interface by fetching the
		// IPv4 address for the interface and adding an IPv4 default route,
		// then stack the LinkProperties on top of the link it's running on.
		try {
		InterfaceConfiguration config = mNMService.getInterfaceConfig(iface);
		LinkAddress clatAddress = config.getLinkAddress();
		mLP.clear();
		mLP.setInterfaceName(iface);

		// Although the clat interface is a point-to-point tunnel, we don't
		// point the route directly at the interface because some apps don't
		// understand routes without gateways (see, e.g., http://b/9597256
		// http://b/9597516). Instead, set the next hop of the route to the
		// clat IPv4 address itself (for those apps, it doesn't matter what
		// the IP of the gateway is, only that there is one).
		try {
		InterfaceConfiguration config = mNMService.getInterfaceConfig(iface);
		LinkAddress clatAddress = config.getLinkAddress();
		mLP.clear();
		mLP.setInterfaceName(iface);
		RouteInfo ipv4Default = new RouteInfo(new LinkAddress(Inet4Address.ANY, 0),
		clatAddress.getAddress(), iface);
		mLP.addRoute(ipv4Default);