+++ /dev/null
-/*
- * Copyright (C) 2016 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.server.connectivity.tethering;
-
-import static android.net.util.NetworkConstants.RFC7421_PREFIX_LENGTH;
-
-import android.net.INetd;
-import android.net.IpPrefix;
-import android.net.LinkAddress;
-import android.net.LinkProperties;
-import android.net.NetworkCapabilities;
-import android.net.NetworkState;
-import android.net.RouteInfo;
-import android.net.ip.RouterAdvertisementDaemon;
-import android.net.ip.RouterAdvertisementDaemon.RaParams;
-import android.net.util.NetdService;
-import android.net.util.SharedLog;
-import android.os.INetworkManagementService;
-import android.os.ServiceSpecificException;
-import android.os.RemoteException;
-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;
-import java.util.Random;
-
-
-/**
- * @hide
- */
-public class IPv6TetheringInterfaceServices {
- private static final String TAG = IPv6TetheringInterfaceServices.class.getSimpleName();
- private static final IpPrefix LINK_LOCAL_PREFIX = new IpPrefix("fe80::/64");
-
- private final String mIfName;
- private final INetworkManagementService mNMService;
- private final SharedLog mLog;
-
- private NetworkInterface mNetworkInterface;
- private byte[] mHwAddr;
- private LinkProperties mLastIPv6LinkProperties;
- private RouterAdvertisementDaemon mRaDaemon;
- private RaParams mLastRaParams;
-
- public IPv6TetheringInterfaceServices(
- String ifname, INetworkManagementService nms, SharedLog log) {
- mIfName = ifname;
- mNMService = nms;
- mLog = log.forSubComponent(mIfName);
- }
-
- public boolean start() {
- // TODO: Refactor for testability (perhaps passing an android.system.Os
- // instance and calling getifaddrs() directly).
- try {
- mNetworkInterface = NetworkInterface.getByName(mIfName);
- } catch (SocketException e) {
- mLog.e("Error looking up NetworkInterfaces: " + e);
- stop();
- return false;
- }
- if (mNetworkInterface == null) {
- mLog.e("Failed to find NetworkInterface");
- stop();
- return false;
- }
-
- try {
- mHwAddr = mNetworkInterface.getHardwareAddress();
- } catch (SocketException e) {
- mLog.e("Failed to find hardware address: " + e);
- stop();
- return false;
- }
-
- final int ifindex = mNetworkInterface.getIndex();
- mRaDaemon = new RouterAdvertisementDaemon(mIfName, ifindex, mHwAddr);
- if (!mRaDaemon.start()) {
- stop();
- return false;
- }
-
- return true;
- }
-
- public void stop() {
- mNetworkInterface = null;
- mHwAddr = null;
- setRaParams(null);
-
- if (mRaDaemon != null) {
- mRaDaemon.stop();
- mRaDaemon = null;
- }
- }
-
- // IPv6TetheringCoordinator sends updates with carefully curated IPv6-only
- // LinkProperties. These have extraneous data filtered out and only the
- // necessary prefixes included (per its prefix distribution policy).
- //
- // TODO: Evaluate using a data structure than is more directly suited to
- // communicating only the relevant information.
- public void updateUpstreamIPv6LinkProperties(LinkProperties v6only) {
- if (mRaDaemon == null) return;
-
- // Avoid unnecessary work on spurious updates.
- if (Objects.equals(mLastIPv6LinkProperties, v6only)) {
- return;
- }
-
- RaParams params = null;
-
- if (v6only != null) {
- params = new RaParams();
- params.mtu = v6only.getMtu();
- params.hasDefaultRoute = v6only.hasIPv6DefaultRoute();
-
- for (LinkAddress linkAddr : v6only.getLinkAddresses()) {
- if (linkAddr.getPrefixLength() != RFC7421_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;
- }
-
-
- 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) {
- mLog.e(String.format("Failed to remove %d IPv6 routes from local table.",
- removalFailures));
- }
- } catch (RemoteException e) {
- mLog.e("Failed to remove IPv6 routes from local table: " + e);
- }
- }
-
- // [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);
- }
-
- 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. We
- // only need to add the link-local prefix once, but in the
- // event we add it more than once netd silently ignores EEXIST.
- addedPrefixes.add(LINK_LOCAL_PREFIX);
- }
-
- if (!addedPrefixes.isEmpty()) {
- final ArrayList<RouteInfo> toBeAdded = getLocalRoutesFor(addedPrefixes);
- try {
- // It's safe to call addInterfaceToLocalNetwork() even if
- // the interface is already in the local_network. Note also
- // that adding routes that already exist does not cause an
- // error (EEXIST is silently ignored).
- mNMService.addInterfaceToLocalNetwork(mIfName, toBeAdded);
- } catch (RemoteException e) {
- mLog.e("Failed to add IPv6 routes to local table: " + e);
- }
- }
- }
- }
-
- private void configureLocalDns(
- HashSet<Inet6Address> deprecatedDnses, HashSet<Inet6Address> newDnses) {
- final INetd netd = NetdService.getInstance();
- if (netd == null) {
- if (newDnses != null) newDnses.clear();
- mLog.e("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 {
- netd.interfaceDelAddress(mIfName, dnsString, RFC7421_PREFIX_LENGTH);
- } catch (ServiceSpecificException | RemoteException e) {
- mLog.e("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_PREFIX_LENGTH);
- } catch (ServiceSpecificException | RemoteException e) {
- mLog.e("Failed to add local dns IP " + dnsString + ": " + e);
- newDnses.remove(dns);
- }
- }
- }
-
- try {
- netd.tetherApplyDnsInterfaces();
- } catch (ServiceSpecificException | RemoteException e) {
- mLog.e("Failed to update local DNS caching server");
- if (newDnses != null) newDnses.clear();
- }
- }
-
- private void setRaParams(RaParams newParams) {
- if (mRaDaemon != null) {
- final RaParams deprecatedParams =
- RaParams.getDeprecatedRaParams(mLastRaParams, newParams);
-
- configureLocalRoutes(deprecatedParams.prefixes,
- (newParams != null) ? newParams.prefixes : null);
-
- configureLocalDns(deprecatedParams.dnses,
- (newParams != null) ? newParams.dnses : null);
-
- 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;
- }
-
- // Given a prefix like 2001:db8::/64 return an address like 2001:db8::1.
- private static Inet6Address getLocalDnsIpFor(IpPrefix localPrefix) {
- final byte[] dnsBytes = localPrefix.getRawAddress();
- dnsBytes[dnsBytes.length - 1] = getRandomNonZeroByte();
- try {
- return Inet6Address.getByAddress(null, dnsBytes, 0);
- } catch (UnknownHostException e) {
- Slog.wtf(TAG, "Failed to construct Inet6Address from: " + localPrefix);
- return null;
- }
- }
-
- private static byte getRandomNonZeroByte() {
- final byte random = (byte) (new Random()).nextInt();
- // Don't pick the subnet-router anycast address, since that might be
- // in use on the upstream already.
- return (random != 0) ? random : 0x1;
- }
-}
package com.android.server.connectivity.tethering;
+import static android.net.util.NetworkConstants.RFC7421_PREFIX_LENGTH;
+
import android.net.ConnectivityManager;
+import android.net.INetd;
import android.net.INetworkStatsService;
import android.net.InterfaceConfiguration;
+import android.net.IpPrefix;
import android.net.LinkAddress;
import android.net.LinkProperties;
import android.net.NetworkUtils;
+import android.net.RouteInfo;
+import android.net.ip.RouterAdvertisementDaemon;
+import android.net.ip.RouterAdvertisementDaemon.RaParams;
+import android.net.util.NetdService;
import android.net.util.SharedLog;
import android.os.INetworkManagementService;
import android.os.Looper;
import android.os.Message;
+import android.os.RemoteException;
+import android.os.ServiceSpecificException;
import android.util.Log;
+import android.util.Slog;
import android.util.SparseArray;
import com.android.internal.util.MessageUtils;
import com.android.internal.util.State;
import com.android.internal.util.StateMachine;
+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;
+import java.util.Random;
/**
* @hide
* Tracks the eligibility of a given network interface for tethering.
*/
public class TetherInterfaceStateMachine extends StateMachine {
+ private static final IpPrefix LINK_LOCAL_PREFIX = new IpPrefix("fe80::/64");
+
private static final String USB_NEAR_IFACE_ADDR = "192.168.42.129";
private static final int USB_PREFIX_LENGTH = 24;
private static final String WIFI_HOST_IFACE_ADDR = "192.168.43.1";
private final String mIfaceName;
private final int mInterfaceType;
private final LinkProperties mLinkProperties;
- private final IPv6TetheringInterfaceServices mIPv6TetherSvc;
private int mLastError;
private String mMyUpstreamIfaceName; // may change over time
+ private NetworkInterface mNetworkInterface;
+ private byte[] mHwAddr;
+ private LinkProperties mLastIPv6LinkProperties;
+ private RouterAdvertisementDaemon mRaDaemon;
+ private RaParams mLastRaParams;
public TetherInterfaceStateMachine(
String ifaceName, Looper looper, int interfaceType, SharedLog log,
INetworkManagementService nMService, INetworkStatsService statsService,
- IControlsTethering tetherController, IPv6TetheringInterfaceServices ipv6Svc) {
+ IControlsTethering tetherController) {
super(ifaceName, looper);
mLog = log.forSubComponent(ifaceName);
mNMService = nMService;
mInterfaceType = interfaceType;
mLinkProperties = new LinkProperties();
mLinkProperties.setInterfaceName(mIfaceName);
- mIPv6TetherSvc = ipv6Svc;
mLastError = ConnectivityManager.TETHER_ERROR_NO_ERROR;
mInitialState = new InitialState();
public void unwanted() { sendMessage(CMD_TETHER_UNREQUESTED); }
+ /**
+ * Internals.
+ */
+
// configured when we start tethering and unconfig'd on error or conclusion
private boolean configureIfaceIp(boolean enabled) {
if (VDBG) Log.d(TAG, "configureIfaceIp(" + enabled + ")");
return true;
}
+ private boolean startIPv6() {
+ // TODO: Refactor for testability (perhaps passing an android.system.Os
+ // instance and calling getifaddrs() directly).
+ try {
+ mNetworkInterface = NetworkInterface.getByName(mIfaceName);
+ } catch (SocketException e) {
+ mLog.e("Error looking up NetworkInterfaces: " + e);
+ stopIPv6();
+ return false;
+ }
+ if (mNetworkInterface == null) {
+ mLog.e("Failed to find NetworkInterface");
+ stopIPv6();
+ return false;
+ }
+
+ try {
+ mHwAddr = mNetworkInterface.getHardwareAddress();
+ } catch (SocketException e) {
+ mLog.e("Failed to find hardware address: " + e);
+ stopIPv6();
+ return false;
+ }
+
+ final int ifindex = mNetworkInterface.getIndex();
+ mRaDaemon = new RouterAdvertisementDaemon(mIfaceName, ifindex, mHwAddr);
+ if (!mRaDaemon.start()) {
+ stopIPv6();
+ return false;
+ }
+
+ return true;
+ }
+
+ private void stopIPv6() {
+ mNetworkInterface = null;
+ mHwAddr = null;
+ setRaParams(null);
+
+ if (mRaDaemon != null) {
+ mRaDaemon.stop();
+ mRaDaemon = null;
+ }
+ }
+
+ // IPv6TetheringCoordinator sends updates with carefully curated IPv6-only
+ // LinkProperties. These have extraneous data filtered out and only the
+ // necessary prefixes included (per its prefix distribution policy).
+ //
+ // TODO: Evaluate using a data structure than is more directly suited to
+ // communicating only the relevant information.
+ private void updateUpstreamIPv6LinkProperties(LinkProperties v6only) {
+ if (mRaDaemon == null) return;
+
+ // Avoid unnecessary work on spurious updates.
+ if (Objects.equals(mLastIPv6LinkProperties, v6only)) {
+ return;
+ }
+
+ RaParams params = null;
+
+ if (v6only != null) {
+ params = new RaParams();
+ params.mtu = v6only.getMtu();
+ params.hasDefaultRoute = v6only.hasIPv6DefaultRoute();
+
+ for (LinkAddress linkAddr : v6only.getLinkAddresses()) {
+ if (linkAddr.getPrefixLength() != RFC7421_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;
+ }
+
+ private void configureLocalRoutes(
+ HashSet<IpPrefix> deprecatedPrefixes, HashSet<IpPrefix> newPrefixes) {
+ // [1] Remove the routes that are deprecated.
+ if (!deprecatedPrefixes.isEmpty()) {
+ final ArrayList<RouteInfo> toBeRemoved =
+ getLocalRoutesFor(mIfaceName, deprecatedPrefixes);
+ try {
+ final int removalFailures = mNMService.removeRoutesFromLocalNetwork(toBeRemoved);
+ if (removalFailures > 0) {
+ mLog.e(String.format("Failed to remove %d IPv6 routes from local table.",
+ removalFailures));
+ }
+ } catch (RemoteException e) {
+ mLog.e("Failed to remove IPv6 routes from local table: " + e);
+ }
+ }
+
+ // [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);
+ }
+
+ 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. We
+ // only need to add the link-local prefix once, but in the
+ // event we add it more than once netd silently ignores EEXIST.
+ addedPrefixes.add(LINK_LOCAL_PREFIX);
+ }
+
+ if (!addedPrefixes.isEmpty()) {
+ final ArrayList<RouteInfo> toBeAdded =
+ getLocalRoutesFor(mIfaceName, addedPrefixes);
+ try {
+ // It's safe to call addInterfaceToLocalNetwork() even if
+ // the interface is already in the local_network. Note also
+ // that adding routes that already exist does not cause an
+ // error (EEXIST is silently ignored).
+ mNMService.addInterfaceToLocalNetwork(mIfaceName, toBeAdded);
+ } catch (RemoteException e) {
+ mLog.e("Failed to add IPv6 routes to local table: " + e);
+ }
+ }
+ }
+ }
+
+ private void configureLocalDns(
+ HashSet<Inet6Address> deprecatedDnses, HashSet<Inet6Address> newDnses) {
+ final INetd netd = NetdService.getInstance();
+ if (netd == null) {
+ if (newDnses != null) newDnses.clear();
+ mLog.e("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 {
+ netd.interfaceDelAddress(mIfaceName, dnsString, RFC7421_PREFIX_LENGTH);
+ } catch (ServiceSpecificException | RemoteException e) {
+ mLog.e("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(mIfaceName, dnsString, RFC7421_PREFIX_LENGTH);
+ } catch (ServiceSpecificException | RemoteException e) {
+ mLog.e("Failed to add local dns IP " + dnsString + ": " + e);
+ newDnses.remove(dns);
+ }
+ }
+ }
+
+ try {
+ netd.tetherApplyDnsInterfaces();
+ } catch (ServiceSpecificException | RemoteException e) {
+ mLog.e("Failed to update local DNS caching server");
+ if (newDnses != null) newDnses.clear();
+ }
+ }
+
+ private void setRaParams(RaParams newParams) {
+ if (mRaDaemon != null) {
+ final RaParams deprecatedParams =
+ RaParams.getDeprecatedRaParams(mLastRaParams, newParams);
+
+ configureLocalRoutes(deprecatedParams.prefixes,
+ (newParams != null) ? newParams.prefixes : null);
+
+ configureLocalDns(deprecatedParams.dnses,
+ (newParams != null) ? newParams.dnses : null);
+
+ mRaDaemon.buildNewRa(deprecatedParams, newParams);
+ }
+
+ mLastRaParams = newParams;
+ }
+
private void maybeLogMessage(State state, int what) {
if (DBG) {
Log.d(TAG, state.getName() + " got " +
transitionTo(mUnavailableState);
break;
case CMD_IPV6_TETHER_UPDATE:
- mIPv6TetherSvc.updateUpstreamIPv6LinkProperties(
- (LinkProperties) message.obj);
+ updateUpstreamIPv6LinkProperties((LinkProperties) message.obj);
break;
default:
return NOT_HANDLED;
return;
}
- if (!mIPv6TetherSvc.start()) {
- mLog.e("Failed to start IPv6TetheringInterfaceServices");
+ if (!startIPv6()) {
+ mLog.e("Failed to startIPv6");
// TODO: Make this a fatal error once Bluetooth IPv6 is sorted.
return;
}
// Note that at this point, we're leaving the tethered state. We can fail any
// of these operations, but it doesn't really change that we have to try them
// all in sequence.
- mIPv6TetherSvc.stop();
+ stopIPv6();
try {
mNMService.untetherInterface(mIfaceName);
if (DBG) Log.d(TAG, "Untethered (ifdown)" + mIfaceName);
break;
case CMD_IPV6_TETHER_UPDATE:
- mIPv6TetherSvc.updateUpstreamIPv6LinkProperties(
- (LinkProperties) message.obj);
+ updateUpstreamIPv6LinkProperties((LinkProperties) message.obj);
break;
case CMD_IP_FORWARDING_ENABLE_ERROR:
case CMD_IP_FORWARDING_DISABLE_ERROR:
sendInterfaceState(IControlsTethering.STATE_UNAVAILABLE);
}
}
+
+ // Accumulate routes representing "prefixes to be assigned to the local
+ // interface", for subsequent modification of local_network routing.
+ private static ArrayList<RouteInfo> getLocalRoutesFor(
+ String ifname, HashSet<IpPrefix> prefixes) {
+ final ArrayList<RouteInfo> localRoutes = new ArrayList<RouteInfo>();
+ for (IpPrefix ipp : prefixes) {
+ localRoutes.add(new RouteInfo(ipp, null, ifname));
+ }
+ return localRoutes;
+ }
+
+ // Given a prefix like 2001:db8::/64 return an address like 2001:db8::1.
+ private static Inet6Address getLocalDnsIpFor(IpPrefix localPrefix) {
+ final byte[] dnsBytes = localPrefix.getRawAddress();
+ dnsBytes[dnsBytes.length - 1] = getRandomNonZeroByte();
+ try {
+ return Inet6Address.getByAddress(null, dnsBytes, 0);
+ } catch (UnknownHostException e) {
+ Slog.wtf(TAG, "Failed to construct Inet6Address from: " + localPrefix);
+ return null;
+ }
+ }
+
+ private static byte getRandomNonZeroByte() {
+ final byte random = (byte) (new Random()).nextInt();
+ // Don't pick the subnet-router anycast address, since that might be
+ // in use on the upstream already.
+ return (random != 0) ? random : 0x1;
+ }
}
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