Handle setting and deprecating local DNS IPv6 addresses (5fe2c037) · Commits · e / os / android_frameworks_base

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

+10 −0

Original line number	Diff line number	Diff line
		@@ -1392,6 +1392,8 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering

		for (Integer netType : mUpstreamIfaceTypes) {
		NetworkInfo info = cm.getNetworkInfo(netType.intValue());
		// TODO: if the network is suspended we should consider
		// that to be the same as connected here.
		if ((info != null) && info.isConnected()) {
		upType = netType.intValue();
		break;
		@@ -1465,6 +1467,10 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering
		// it immediately, because there likely will be no second
		// EVENT_ON_AVAILABLE (it was already received).
		handleNewUpstreamNetworkState(ns);
		} else if (mCurrentUpstreamIface == null) {
		// There are no available upstream networks, or none that
		// have an IPv4 default route (current metric for success).
		handleNewUpstreamNetworkState(null);
		}
		}

		@@ -1639,6 +1645,7 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering
		chooseUpstreamType(mTryCell);
		mTryCell = !mTryCell;
		}

		@Override
		public void exit() {
		// TODO: examine if we should check the return value.
		@@ -1646,7 +1653,9 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering
		mUpstreamNetworkMonitor.stop();
		stopListeningForSimChanges();
		notifyTetheredOfNewUpstreamIface(null);
		handleNewUpstreamNetworkState(null);
		}

		@Override
		public boolean processMessage(Message message) {
		maybeLogMessage(this, message.what);
		@@ -1734,6 +1743,7 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering
		// reevaluation is triggered via received CONNECTIVITY_ACTION
		// broadcasts that result in being passed a
		// TetherMasterSM.CMD_UPSTREAM_CHANGED.
		handleNewUpstreamNetworkState(null);
		break;
		default:
		break;

services/core/java/com/android/server/connectivity/tethering/IPv6TetheringCoordinator.java

+9 −9

Original line number	Diff line number	Diff line
		@@ -55,7 +55,7 @@ public class IPv6TetheringCoordinator {
		if (VDBG) {
		Log.d(TAG, "updateUpstreamNetworkState: " + toDebugString(ns));
		}
		if (ns == null \|\| ns.network == null) {
		if (!canTetherIPv6(ns)) {
		stopIPv6TetheringOnAllInterfaces();
		setUpstreamNetworkState(null);
		return;
		@@ -65,8 +65,9 @@ public class IPv6TetheringCoordinator {
		!ns.network.equals(mUpstreamNetworkState.network)) {
		stopIPv6TetheringOnAllInterfaces();
		}

		setUpstreamNetworkState(ns);
		maybeUpdateIPv6TetheringInterfaces();
		updateIPv6TetheringInterfaces();
		}

		private void stopIPv6TetheringOnAllInterfaces() {
		@@ -77,9 +78,10 @@ public class IPv6TetheringCoordinator {
		}

		private void setUpstreamNetworkState(NetworkState ns) {
		if (!canTetherIPv6(ns)) {
		if (ns == null) {
		mUpstreamNetworkState = null;
		} else {
		// Make a deep copy of the parts we need.
		mUpstreamNetworkState = new NetworkState(
		null,
		new LinkProperties(ns.linkProperties),
		@@ -94,19 +96,17 @@ public class IPv6TetheringCoordinator {
		}
		}

		private void maybeUpdateIPv6TetheringInterfaces() {
		if (mUpstreamNetworkState == null) return;

		private void updateIPv6TetheringInterfaces() {
		for (TetherInterfaceStateMachine sm : mNotifyList) {
		final LinkProperties lp = getInterfaceIPv6LinkProperties(sm.interfaceType());
		if (lp != null) {
		sm.sendMessage(TetherInterfaceStateMachine.CMD_IPV6_TETHER_UPDATE, 0, 0, lp);
		}
		break;
		}
		}

		private LinkProperties getInterfaceIPv6LinkProperties(int interfaceType) {
		if (mUpstreamNetworkState == null) return null;

		// NOTE: Here, in future, we would have policies to decide how to divvy
		// up the available dedicated prefixes among downstream interfaces.
		// At this time we have no such mechanism--we only support tethering

services/core/java/com/android/server/connectivity/tethering/IPv6TetheringInterfaceServices.java

+148 −60

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@

		package com.android.server.connectivity.tethering;

		import android.net.INetd;
		import android.net.IpPrefix;
		import android.net.LinkAddress;
		import android.net.LinkProperties;
		@@ -27,13 +28,16 @@ import android.net.ip.RouterAdvertisementDaemon.RaParams;
		import android.os.INetworkManagementService;
		import android.os.RemoteException;
		import android.util.Log;
		import android.util.Slog;

		import java.net.Inet6Address;
		import java.net.InetAddress;
		import java.net.NetworkInterface;
		import java.net.SocketException;
		import java.net.UnknownHostException;
		import java.util.ArrayList;
		import java.util.HashSet;
		import java.util.Objects;


		/**
		@@ -41,13 +45,15 @@ import java.util.HashSet;
		*/
		class IPv6TetheringInterfaceServices {
		private static final String TAG = IPv6TetheringInterfaceServices.class.getSimpleName();
		private static final IpPrefix LINK_LOCAL_PREFIX = new IpPrefix("fe80::/64");
		private static final int RFC7421_IP_PREFIX_LENGTH = 64;

		private final String mIfName;
		private final INetworkManagementService mNMService;

		private NetworkInterface mNetworkInterface;
		private byte[] mHwAddr;
		private ArrayList<RouteInfo> mLastLocalRoutes;
		private LinkProperties mLastIPv6LinkProperties;
		private RouterAdvertisementDaemon mRaDaemon;
		private RaParams mLastRaParams;

		@@ -86,8 +92,7 @@ class IPv6TetheringInterfaceServices {
		public void stop() {
		mNetworkInterface = null;
		mHwAddr = null;
		updateLocalRoutes(null);
		updateRaParams(null);
		setRaParams(null);

		if (mRaDaemon != null) {
		mRaDaemon.stop();
		@@ -104,95 +109,178 @@ class IPv6TetheringInterfaceServices {
		public void updateUpstreamIPv6LinkProperties(LinkProperties v6only) {
		if (mRaDaemon == null) return;

		if (v6only == null) {
		updateLocalRoutes(null);
		updateRaParams(null);
		// Avoid unnecessary work on spurious updates.
		if (Objects.equals(mLastIPv6LinkProperties, v6only)) {
		return;
		}

		RaParams params = new RaParams();
		RaParams params = null;

		if (v6only != null) {
		params = new RaParams();
		params.mtu = v6only.getMtu();
		params.hasDefaultRoute = v6only.hasIPv6DefaultRoute();

		ArrayList<RouteInfo> localRoutes = new ArrayList<RouteInfo>();
		for (LinkAddress linkAddr : v6only.getLinkAddresses()) {
		final IpPrefix prefix = new IpPrefix(linkAddr.getAddress(),
		linkAddr.getPrefixLength());

		// Accumulate routes representing "prefixes to be assigned to the
		// local interface", for subsequent addition to the local network
		// in the routing rules.
		localRoutes.add(new RouteInfo(prefix, null, mIfName));
		if (linkAddr.getPrefixLength() != RFC7421_IP_PREFIX_LENGTH) continue;

		final IpPrefix prefix = new IpPrefix(
		linkAddr.getAddress(), linkAddr.getPrefixLength());
		params.prefixes.add(prefix);

		final Inet6Address dnsServer = getLocalDnsIpFor(prefix);
		if (dnsServer != null) {
		params.dnses.add(dnsServer);
		}
		}
		}
		// If v6only is null, we pass in null to setRaParams(), which handles
		// deprecation of any existing RA data.

		setRaParams(params);
		mLastIPv6LinkProperties = v6only;
		}

		// We need to be able to send unicast RAs, and clients might like to
		// ping the default router's link-local address, so add that as well.
		localRoutes.add(new RouteInfo(new IpPrefix("fe80::/64"), null, mIfName));

		// TODO: Add a local interface address, update dnsmasq to listen on the
		// new address, and use only that address as a DNS server.
		for (InetAddress dnsServer : v6only.getDnsServers()) {
		if (dnsServer instanceof Inet6Address) {
		params.dnses.add((Inet6Address) dnsServer);
		private void configureLocalRoutes(
		HashSet<IpPrefix> deprecatedPrefixes, HashSet<IpPrefix> newPrefixes) {
		// [1] Remove the routes that are deprecated.
		if (!deprecatedPrefixes.isEmpty()) {
		final ArrayList<RouteInfo> toBeRemoved = getLocalRoutesFor(deprecatedPrefixes);
		try {
		final int removalFailures = mNMService.removeRoutesFromLocalNetwork(toBeRemoved);
		if (removalFailures > 0) {
		Log.e(TAG, String.format("Failed to remove %d IPv6 routes from local table.",
		removalFailures));
		}
		} catch (RemoteException e) {
		Log.e(TAG, "Failed to remove IPv6 routes from local table: ", e);
		}
		}

		updateLocalRoutes(localRoutes);
		updateRaParams(params);
		// [2] Add only the routes that have not previously been added.
		if (newPrefixes != null && !newPrefixes.isEmpty()) {
		HashSet<IpPrefix> addedPrefixes = (HashSet) newPrefixes.clone();
		if (mLastRaParams != null) {
		addedPrefixes.removeAll(mLastRaParams.prefixes);
		}

		private void updateLocalRoutes(ArrayList<RouteInfo> localRoutes) {
		if (localRoutes != null) {
		// TODO: Compare with mLastLocalRoutes and take appropriate
		// appropriate action on the difference between the two.
		if (mLastRaParams == null \|\| mLastRaParams.prefixes.isEmpty()) {
		// We need to be able to send unicast RAs, and clients might
		// like to ping the default router's link-local address. Note
		// that we never remove the link-local route from the network
		// until Tethering disables tethering on the interface.
		addedPrefixes.add(LINK_LOCAL_PREFIX);
		}

		if (!localRoutes.isEmpty()) {
		if (!addedPrefixes.isEmpty()) {
		final ArrayList<RouteInfo> toBeAdded = getLocalRoutesFor(addedPrefixes);
		try {
		mNMService.addInterfaceToLocalNetwork(mIfName, localRoutes);
		// It's safe to call addInterfaceToLocalNetwork() even if
		// the interface is already in the local_network.
		mNMService.addInterfaceToLocalNetwork(mIfName, toBeAdded);
		} catch (RemoteException e) {
		Log.e(TAG, "Failed to add IPv6 routes to local table: ", e);
		}
		}
		} else {
		if (mLastLocalRoutes != null && !mLastLocalRoutes.isEmpty()) {
		}
		}

		private void configureLocalDns(
		HashSet<Inet6Address> deprecatedDnses, HashSet<Inet6Address> newDnses) {
		INetd netd = getNetdServiceOrNull();
		if (netd == null) {
		if (newDnses != null) newDnses.clear();
		Log.e(TAG, "No netd service instance available; not setting local IPv6 addresses");
		return;
		}

		// [1] Remove deprecated local DNS IP addresses.
		if (!deprecatedDnses.isEmpty()) {
		for (Inet6Address dns : deprecatedDnses) {
		final String dnsString = dns.getHostAddress();
		try {
		final int removalFailures =
		mNMService.removeRoutesFromLocalNetwork(mLastLocalRoutes);
		if (removalFailures > 0) {
		Log.e(TAG,
		String.format("Failed to remove %d IPv6 routes from local table.",
		removalFailures));
		netd.interfaceDelAddress(mIfName, dnsString, RFC7421_IP_PREFIX_LENGTH);
		} catch (RemoteException e) {
		Log.e(TAG, "Failed to remove local dns IP: " + dnsString, e);
		}
		}
		}

		// [2] Add only the local DNS IP addresses that have not previously been added.
		if (newDnses != null && !newDnses.isEmpty()) {
		final HashSet<Inet6Address> addedDnses = (HashSet) newDnses.clone();
		if (mLastRaParams != null) {
		addedDnses.removeAll(mLastRaParams.dnses);
		}

		for (Inet6Address dns : addedDnses) {
		final String dnsString = dns.getHostAddress();
		try {
		netd.interfaceAddAddress(mIfName, dnsString, RFC7421_IP_PREFIX_LENGTH);
		} catch (RemoteException e) {
		Log.e(TAG, "Failed to remove IPv6 routes from local table: ", e);
		Log.e(TAG, "Failed to add local dns IP: " + dnsString, e);
		newDnses.remove(dns);
		}
		}
		}

		mLastLocalRoutes = localRoutes;
		try {
		netd.tetherApplyDnsInterfaces();
		} catch (RemoteException e) {
		Log.e(TAG, "Failed to update local DNS caching server");
		if (newDnses != null) newDnses.clear();
		}
		}

		private void updateRaParams(RaParams params) {
		private void setRaParams(RaParams newParams) {
		if (mRaDaemon != null) {
		HashSet<IpPrefix> deprecated = null;
		final RaParams deprecatedParams =
		RaParams.getDeprecatedRaParams(mLastRaParams, newParams);

		if (mLastRaParams != null) {
		deprecated = new HashSet<>();
		configureLocalRoutes(deprecatedParams.prefixes,
		(newParams != null) ? newParams.prefixes : null);

		configureLocalDns(deprecatedParams.dnses,
		(newParams != null) ? newParams.dnses : null);

		for (IpPrefix ipp : mLastRaParams.prefixes) {
		if (params == null \|\| !params.prefixes.contains(ipp)) {
		deprecated.add(ipp);
		mRaDaemon.buildNewRa(deprecatedParams, newParams);
		}

		mLastRaParams = newParams;
		}

		// Accumulate routes representing "prefixes to be assigned to the local
		// interface", for subsequent modification of local_network routing.
		private ArrayList<RouteInfo> getLocalRoutesFor(HashSet<IpPrefix> prefixes) {
		final ArrayList<RouteInfo> localRoutes = new ArrayList<RouteInfo>();
		for (IpPrefix ipp : prefixes) {
		localRoutes.add(new RouteInfo(ipp, null, mIfName));
		}
		return localRoutes;
		}

		// Currently, we send spurious RAs (5) whenever there's any update.
		// TODO: Compare params with mLastParams to avoid spurious updates.
		mRaDaemon.buildNewRa(params, deprecated);
		private INetd getNetdServiceOrNull() {
		if (mNMService != null) {
		try {
		return mNMService.getNetdService();
		} catch (RemoteException ignored) {
		// This blocks until netd can be reached, but it can return
		// null during a netd crash.
		}
		}
		return null;
		}

		mLastRaParams = params;
		// Given a prefix like 2001:db8::/64 return 2001:db8::1.
		private static Inet6Address getLocalDnsIpFor(IpPrefix localPrefix) {
		final byte[] dnsBytes = localPrefix.getRawAddress();
		dnsBytes[dnsBytes.length - 1] = 0x1;
		try {
		return Inet6Address.getByAddress(null, dnsBytes, 0);
		} catch (UnknownHostException e) {
		Slog.wtf(TAG, "Failed to construct Inet6Address from: " + localPrefix);
		return null;
		}
		}
		}

services/net/java/android/net/ip/RouterAdvertisementDaemon.java

+153 −81

File changed.

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