1232fe37be
This freezes the interface as of the latest beta build, not the tip of
tree. IIpClient#setL2KeyAndGroupHint is not in the frozen definition in
particular.
Generated with:
m networkstack-aidl-interfaces-freeze-api \
ipmemorystore-aidl-interfaces-freeze-api
Test: flashed, booted, WiFi and captive portal working
Bug: 128803828
Change-Id: Ideabe73fc93bbefca2d624ee9ca190cf31419424
993 lines
38 KiB
Java
993 lines
38 KiB
Java
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.net.ip;
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import static android.net.NetworkUtils.numericToInetAddress;
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import static android.net.dhcp.IDhcpServer.STATUS_SUCCESS;
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import static android.net.util.NetworkConstants.FF;
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import static android.net.util.NetworkConstants.RFC7421_PREFIX_LENGTH;
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import static android.net.util.NetworkConstants.asByte;
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import android.net.ConnectivityManager;
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import android.net.INetd;
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import android.net.INetworkStackStatusCallback;
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import android.net.INetworkStatsService;
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import android.net.InterfaceConfiguration;
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import android.net.IpPrefix;
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import android.net.LinkAddress;
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import android.net.LinkProperties;
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import android.net.NetworkStackClient;
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import android.net.RouteInfo;
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import android.net.dhcp.DhcpServerCallbacks;
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import android.net.dhcp.DhcpServingParamsParcel;
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import android.net.dhcp.DhcpServingParamsParcelExt;
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import android.net.dhcp.IDhcpServer;
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import android.net.ip.RouterAdvertisementDaemon.RaParams;
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import android.net.util.InterfaceParams;
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import android.net.util.InterfaceSet;
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import android.net.util.NetdService;
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import android.net.util.SharedLog;
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import android.os.INetworkManagementService;
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import android.os.Looper;
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import android.os.Message;
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import android.os.RemoteException;
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import android.os.ServiceSpecificException;
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import android.util.Log;
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import android.util.Slog;
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import android.util.SparseArray;
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import com.android.internal.util.MessageUtils;
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import com.android.internal.util.Protocol;
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import com.android.internal.util.State;
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import com.android.internal.util.StateMachine;
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import java.net.Inet4Address;
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import java.net.Inet6Address;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.Objects;
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import java.util.Random;
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import java.util.Set;
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/**
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* Provides the interface to IP-layer serving functionality for a given network
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* interface, e.g. for tethering or "local-only hotspot" mode.
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*
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* @hide
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*/
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public class IpServer extends StateMachine {
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public static final int STATE_UNAVAILABLE = 0;
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public static final int STATE_AVAILABLE = 1;
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public static final int STATE_TETHERED = 2;
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public static final int STATE_LOCAL_ONLY = 3;
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public static String getStateString(int state) {
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switch (state) {
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case STATE_UNAVAILABLE: return "UNAVAILABLE";
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case STATE_AVAILABLE: return "AVAILABLE";
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case STATE_TETHERED: return "TETHERED";
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case STATE_LOCAL_ONLY: return "LOCAL_ONLY";
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}
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return "UNKNOWN: " + state;
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}
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private static final byte DOUG_ADAMS = (byte) 42;
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private static final String USB_NEAR_IFACE_ADDR = "192.168.42.129";
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private static final int USB_PREFIX_LENGTH = 24;
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private static final String WIFI_HOST_IFACE_ADDR = "192.168.43.1";
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private static final int WIFI_HOST_IFACE_PREFIX_LENGTH = 24;
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// TODO: have PanService use some visible version of this constant
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private static final String BLUETOOTH_IFACE_ADDR = "192.168.44.1";
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private static final int BLUETOOTH_DHCP_PREFIX_LENGTH = 24;
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// TODO: have this configurable
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private static final int DHCP_LEASE_TIME_SECS = 3600;
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private final static String TAG = "IpServer";
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private final static boolean DBG = false;
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private final static boolean VDBG = false;
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private static final Class[] messageClasses = {
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IpServer.class
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};
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private static final SparseArray<String> sMagicDecoderRing =
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MessageUtils.findMessageNames(messageClasses);
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public static class Callback {
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/**
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* Notify that |who| has changed its tethering state.
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*
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* @param who the calling instance of IpServer
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* @param state one of STATE_*
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* @param lastError one of ConnectivityManager.TETHER_ERROR_*
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*/
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public void updateInterfaceState(IpServer who, int state, int lastError) {}
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/**
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* Notify that |who| has new LinkProperties.
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*
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* @param who the calling instance of IpServer
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* @param newLp the new LinkProperties to report
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*/
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public void updateLinkProperties(IpServer who, LinkProperties newLp) {}
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}
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public static class Dependencies {
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public RouterAdvertisementDaemon getRouterAdvertisementDaemon(InterfaceParams ifParams) {
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return new RouterAdvertisementDaemon(ifParams);
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}
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public InterfaceParams getInterfaceParams(String ifName) {
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return InterfaceParams.getByName(ifName);
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}
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public INetd getNetdService() {
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return NetdService.getInstance();
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}
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/**
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* Create a DhcpServer instance to be used by IpServer.
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*/
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public void makeDhcpServer(String ifName, DhcpServingParamsParcel params,
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DhcpServerCallbacks cb) {
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NetworkStackClient.getInstance().makeDhcpServer(ifName, params, cb);
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}
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}
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private static final int BASE_IFACE = Protocol.BASE_TETHERING + 100;
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// request from the user that it wants to tether
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public static final int CMD_TETHER_REQUESTED = BASE_IFACE + 2;
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// request from the user that it wants to untether
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public static final int CMD_TETHER_UNREQUESTED = BASE_IFACE + 3;
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// notification that this interface is down
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public static final int CMD_INTERFACE_DOWN = BASE_IFACE + 4;
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// notification from the master SM that it had trouble enabling IP Forwarding
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public static final int CMD_IP_FORWARDING_ENABLE_ERROR = BASE_IFACE + 7;
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// notification from the master SM that it had trouble disabling IP Forwarding
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public static final int CMD_IP_FORWARDING_DISABLE_ERROR = BASE_IFACE + 8;
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// notification from the master SM that it had trouble starting tethering
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public static final int CMD_START_TETHERING_ERROR = BASE_IFACE + 9;
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// notification from the master SM that it had trouble stopping tethering
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public static final int CMD_STOP_TETHERING_ERROR = BASE_IFACE + 10;
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// notification from the master SM that it had trouble setting the DNS forwarders
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public static final int CMD_SET_DNS_FORWARDERS_ERROR = BASE_IFACE + 11;
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// the upstream connection has changed
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public static final int CMD_TETHER_CONNECTION_CHANGED = BASE_IFACE + 12;
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// new IPv6 tethering parameters need to be processed
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public static final int CMD_IPV6_TETHER_UPDATE = BASE_IFACE + 13;
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private final State mInitialState;
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private final State mLocalHotspotState;
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private final State mTetheredState;
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private final State mUnavailableState;
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private final SharedLog mLog;
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private final INetworkManagementService mNMService;
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private final INetd mNetd;
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private final INetworkStatsService mStatsService;
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private final Callback mCallback;
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private final InterfaceController mInterfaceCtrl;
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private final String mIfaceName;
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private final int mInterfaceType;
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private final LinkProperties mLinkProperties;
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private final boolean mUsingLegacyDhcp;
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private final Dependencies mDeps;
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private int mLastError;
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private int mServingMode;
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private InterfaceSet mUpstreamIfaceSet; // may change over time
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private InterfaceParams mInterfaceParams;
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// TODO: De-duplicate this with mLinkProperties above. Currently, these link
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// properties are those selected by the IPv6TetheringCoordinator and relayed
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// to us. By comparison, mLinkProperties contains the addresses and directly
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// connected routes that have been formed from these properties iff. we have
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// succeeded in configuring them and are able to announce them within Router
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// Advertisements (otherwise, we do not add them to mLinkProperties at all).
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private LinkProperties mLastIPv6LinkProperties;
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private RouterAdvertisementDaemon mRaDaemon;
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// To be accessed only on the handler thread
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private int mDhcpServerStartIndex = 0;
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private IDhcpServer mDhcpServer;
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private RaParams mLastRaParams;
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public IpServer(
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String ifaceName, Looper looper, int interfaceType, SharedLog log,
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INetworkManagementService nMService, INetworkStatsService statsService,
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Callback callback, boolean usingLegacyDhcp, Dependencies deps) {
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super(ifaceName, looper);
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mLog = log.forSubComponent(ifaceName);
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mNMService = nMService;
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mNetd = deps.getNetdService();
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mStatsService = statsService;
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mCallback = callback;
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mInterfaceCtrl = new InterfaceController(ifaceName, mNetd, mLog);
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mIfaceName = ifaceName;
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mInterfaceType = interfaceType;
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mLinkProperties = new LinkProperties();
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mUsingLegacyDhcp = usingLegacyDhcp;
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mDeps = deps;
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resetLinkProperties();
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mLastError = ConnectivityManager.TETHER_ERROR_NO_ERROR;
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mServingMode = STATE_AVAILABLE;
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mInitialState = new InitialState();
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mLocalHotspotState = new LocalHotspotState();
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mTetheredState = new TetheredState();
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mUnavailableState = new UnavailableState();
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addState(mInitialState);
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addState(mLocalHotspotState);
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addState(mTetheredState);
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addState(mUnavailableState);
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setInitialState(mInitialState);
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}
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public String interfaceName() { return mIfaceName; }
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public int interfaceType() { return mInterfaceType; }
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public int lastError() { return mLastError; }
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public int servingMode() { return mServingMode; }
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public LinkProperties linkProperties() { return new LinkProperties(mLinkProperties); }
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public void stop() { sendMessage(CMD_INTERFACE_DOWN); }
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public void unwanted() { sendMessage(CMD_TETHER_UNREQUESTED); }
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/**
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* Internals.
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*/
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private boolean startIPv4() { return configureIPv4(true); }
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/**
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* Convenience wrapper around INetworkStackStatusCallback to run callbacks on the IpServer
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* handler.
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*
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* <p>Different instances of this class can be created for each call to IDhcpServer methods,
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* with different implementations of the callback, to differentiate handling of success/error in
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* each call.
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*/
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private abstract class OnHandlerStatusCallback extends INetworkStackStatusCallback.Stub {
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@Override
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public void onStatusAvailable(int statusCode) {
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getHandler().post(() -> callback(statusCode));
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}
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public abstract void callback(int statusCode);
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@Override
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public int getInterfaceVersion() {
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return this.VERSION;
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}
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}
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private class DhcpServerCallbacksImpl extends DhcpServerCallbacks {
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private final int mStartIndex;
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private DhcpServerCallbacksImpl(int startIndex) {
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mStartIndex = startIndex;
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}
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@Override
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public void onDhcpServerCreated(int statusCode, IDhcpServer server) throws RemoteException {
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getHandler().post(() -> {
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// We are on the handler thread: mDhcpServerStartIndex can be read safely.
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if (mStartIndex != mDhcpServerStartIndex) {
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// This start request is obsolete. When the |server| binder token goes out of
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// scope, the garbage collector will finalize it, which causes the network stack
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// process garbage collector to collect the server itself.
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return;
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}
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if (statusCode != STATUS_SUCCESS) {
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mLog.e("Error obtaining DHCP server: " + statusCode);
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handleError();
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return;
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}
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mDhcpServer = server;
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try {
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mDhcpServer.start(new OnHandlerStatusCallback() {
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@Override
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public void callback(int startStatusCode) {
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if (startStatusCode != STATUS_SUCCESS) {
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mLog.e("Error starting DHCP server: " + startStatusCode);
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handleError();
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}
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}
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});
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} catch (RemoteException e) {
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e.rethrowFromSystemServer();
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}
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});
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}
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private void handleError() {
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mLastError = ConnectivityManager.TETHER_ERROR_DHCPSERVER_ERROR;
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transitionTo(mInitialState);
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}
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}
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private boolean startDhcp(Inet4Address addr, int prefixLen) {
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if (mUsingLegacyDhcp) {
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return true;
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}
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final DhcpServingParamsParcel params;
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params = new DhcpServingParamsParcelExt()
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.setDefaultRouters(addr)
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.setDhcpLeaseTimeSecs(DHCP_LEASE_TIME_SECS)
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.setDnsServers(addr)
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.setServerAddr(new LinkAddress(addr, prefixLen))
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.setMetered(true);
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// TODO: also advertise link MTU
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mDhcpServerStartIndex++;
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mDeps.makeDhcpServer(
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mIfaceName, params, new DhcpServerCallbacksImpl(mDhcpServerStartIndex));
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return true;
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}
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private void stopDhcp() {
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// Make all previous start requests obsolete so servers are not started later
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mDhcpServerStartIndex++;
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if (mDhcpServer != null) {
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try {
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mDhcpServer.stop(new OnHandlerStatusCallback() {
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@Override
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public void callback(int statusCode) {
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if (statusCode != STATUS_SUCCESS) {
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mLog.e("Error stopping DHCP server: " + statusCode);
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mLastError = ConnectivityManager.TETHER_ERROR_DHCPSERVER_ERROR;
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// Not much more we can do here
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}
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}
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});
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mDhcpServer = null;
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} catch (RemoteException e) {
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e.rethrowFromSystemServer();
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}
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}
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}
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private boolean configureDhcp(boolean enable, Inet4Address addr, int prefixLen) {
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if (enable) {
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return startDhcp(addr, prefixLen);
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} else {
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stopDhcp();
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return true;
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}
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}
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private void stopIPv4() {
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configureIPv4(false);
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// NOTE: All of configureIPv4() will be refactored out of existence
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// into calls to InterfaceController, shared with startIPv4().
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mInterfaceCtrl.clearIPv4Address();
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}
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// TODO: Refactor this in terms of calls to InterfaceController.
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private boolean configureIPv4(boolean enabled) {
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if (VDBG) Log.d(TAG, "configureIPv4(" + enabled + ")");
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// TODO: Replace this hard-coded information with dynamically selected
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// config passed down to us by a higher layer IP-coordinating element.
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String ipAsString = null;
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int prefixLen = 0;
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if (mInterfaceType == ConnectivityManager.TETHERING_USB) {
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ipAsString = USB_NEAR_IFACE_ADDR;
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prefixLen = USB_PREFIX_LENGTH;
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} else if (mInterfaceType == ConnectivityManager.TETHERING_WIFI) {
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ipAsString = getRandomWifiIPv4Address();
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prefixLen = WIFI_HOST_IFACE_PREFIX_LENGTH;
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} else {
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// BT configures the interface elsewhere: only start DHCP.
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final Inet4Address srvAddr = (Inet4Address) numericToInetAddress(BLUETOOTH_IFACE_ADDR);
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return configureDhcp(enabled, srvAddr, BLUETOOTH_DHCP_PREFIX_LENGTH);
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}
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final LinkAddress linkAddr;
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try {
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final InterfaceConfiguration ifcg = mNMService.getInterfaceConfig(mIfaceName);
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if (ifcg == null) {
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mLog.e("Received null interface config");
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return false;
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}
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InetAddress addr = numericToInetAddress(ipAsString);
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linkAddr = new LinkAddress(addr, prefixLen);
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ifcg.setLinkAddress(linkAddr);
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if (mInterfaceType == ConnectivityManager.TETHERING_WIFI) {
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// The WiFi stack has ownership of the interface up/down state.
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// It is unclear whether the Bluetooth or USB stacks will manage their own
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// state.
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ifcg.ignoreInterfaceUpDownStatus();
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} else {
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if (enabled) {
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ifcg.setInterfaceUp();
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} else {
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ifcg.setInterfaceDown();
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}
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}
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ifcg.clearFlag("running");
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mNMService.setInterfaceConfig(mIfaceName, ifcg);
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if (!configureDhcp(enabled, (Inet4Address) addr, prefixLen)) {
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return false;
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}
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} catch (Exception e) {
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mLog.e("Error configuring interface " + e);
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return false;
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}
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// Directly-connected route.
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final RouteInfo route = new RouteInfo(linkAddr);
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if (enabled) {
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mLinkProperties.addLinkAddress(linkAddr);
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mLinkProperties.addRoute(route);
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} else {
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mLinkProperties.removeLinkAddress(linkAddr);
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mLinkProperties.removeRoute(route);
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}
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return true;
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}
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private String getRandomWifiIPv4Address() {
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try {
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byte[] bytes = numericToInetAddress(WIFI_HOST_IFACE_ADDR).getAddress();
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bytes[3] = getRandomSanitizedByte(DOUG_ADAMS, asByte(0), asByte(1), FF);
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return InetAddress.getByAddress(bytes).getHostAddress();
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} catch (Exception e) {
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return WIFI_HOST_IFACE_ADDR;
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}
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}
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private boolean startIPv6() {
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mInterfaceParams = mDeps.getInterfaceParams(mIfaceName);
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if (mInterfaceParams == null) {
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mLog.e("Failed to find InterfaceParams");
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stopIPv6();
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return false;
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}
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mRaDaemon = mDeps.getRouterAdvertisementDaemon(mInterfaceParams);
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if (!mRaDaemon.start()) {
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stopIPv6();
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return false;
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}
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return true;
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}
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private void stopIPv6() {
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mInterfaceParams = null;
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setRaParams(null);
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if (mRaDaemon != null) {
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mRaDaemon.stop();
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mRaDaemon = null;
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}
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}
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// IPv6TetheringCoordinator sends updates with carefully curated IPv6-only
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// LinkProperties. These have extraneous data filtered out and only the
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// 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();
|
|
|
|
if (params.hasDefaultRoute) params.hopLimit = getHopLimit(v6only.getInterfaceName());
|
|
|
|
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 configureLocalIPv6Routes(
|
|
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);
|
|
}
|
|
|
|
for (RouteInfo route : toBeRemoved) mLinkProperties.removeRoute(route);
|
|
}
|
|
|
|
// [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 (!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 (Exception e) {
|
|
mLog.e("Failed to add IPv6 routes to local table: " + e);
|
|
}
|
|
|
|
for (RouteInfo route : toBeAdded) mLinkProperties.addRoute(route);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void configureLocalIPv6Dns(
|
|
HashSet<Inet6Address> deprecatedDnses, HashSet<Inet6Address> newDnses) {
|
|
// TODO: Is this really necessary? Can we not fail earlier if INetd cannot be located?
|
|
if (mNetd == 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) {
|
|
if (!mInterfaceCtrl.removeAddress(dns, RFC7421_PREFIX_LENGTH)) {
|
|
mLog.e("Failed to remove local dns IP " + dns);
|
|
}
|
|
|
|
mLinkProperties.removeLinkAddress(new LinkAddress(dns, RFC7421_PREFIX_LENGTH));
|
|
}
|
|
}
|
|
|
|
// [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) {
|
|
if (!mInterfaceCtrl.addAddress(dns, RFC7421_PREFIX_LENGTH)) {
|
|
mLog.e("Failed to add local dns IP " + dns);
|
|
newDnses.remove(dns);
|
|
}
|
|
|
|
mLinkProperties.addLinkAddress(new LinkAddress(dns, RFC7421_PREFIX_LENGTH));
|
|
}
|
|
}
|
|
|
|
try {
|
|
mNetd.tetherApplyDnsInterfaces();
|
|
} catch (ServiceSpecificException | RemoteException e) {
|
|
mLog.e("Failed to update local DNS caching server");
|
|
if (newDnses != null) newDnses.clear();
|
|
}
|
|
}
|
|
|
|
private byte getHopLimit(String upstreamIface) {
|
|
try {
|
|
int upstreamHopLimit = Integer.parseUnsignedInt(
|
|
mNetd.getProcSysNet(INetd.IPV6, INetd.CONF, upstreamIface, "hop_limit"));
|
|
// Add one hop to account for this forwarding device
|
|
upstreamHopLimit++;
|
|
// Cap the hop limit to 255.
|
|
return (byte) Integer.min(upstreamHopLimit, 255);
|
|
} catch (Exception e) {
|
|
mLog.e("Failed to find upstream interface hop limit", e);
|
|
}
|
|
return RaParams.DEFAULT_HOPLIMIT;
|
|
}
|
|
|
|
private void setRaParams(RaParams newParams) {
|
|
if (mRaDaemon != null) {
|
|
final RaParams deprecatedParams =
|
|
RaParams.getDeprecatedRaParams(mLastRaParams, newParams);
|
|
|
|
configureLocalIPv6Routes(deprecatedParams.prefixes,
|
|
(newParams != null) ? newParams.prefixes : null);
|
|
|
|
configureLocalIPv6Dns(deprecatedParams.dnses,
|
|
(newParams != null) ? newParams.dnses : null);
|
|
|
|
mRaDaemon.buildNewRa(deprecatedParams, newParams);
|
|
}
|
|
|
|
mLastRaParams = newParams;
|
|
}
|
|
|
|
private void logMessage(State state, int what) {
|
|
mLog.log(state.getName() + " got " + sMagicDecoderRing.get(what, Integer.toString(what)));
|
|
}
|
|
|
|
private void sendInterfaceState(int newInterfaceState) {
|
|
mServingMode = newInterfaceState;
|
|
mCallback.updateInterfaceState(this, newInterfaceState, mLastError);
|
|
sendLinkProperties();
|
|
}
|
|
|
|
private void sendLinkProperties() {
|
|
mCallback.updateLinkProperties(this, new LinkProperties(mLinkProperties));
|
|
}
|
|
|
|
private void resetLinkProperties() {
|
|
mLinkProperties.clear();
|
|
mLinkProperties.setInterfaceName(mIfaceName);
|
|
}
|
|
|
|
class InitialState extends State {
|
|
@Override
|
|
public void enter() {
|
|
sendInterfaceState(STATE_AVAILABLE);
|
|
}
|
|
|
|
@Override
|
|
public boolean processMessage(Message message) {
|
|
logMessage(this, message.what);
|
|
switch (message.what) {
|
|
case CMD_TETHER_REQUESTED:
|
|
mLastError = ConnectivityManager.TETHER_ERROR_NO_ERROR;
|
|
switch (message.arg1) {
|
|
case STATE_LOCAL_ONLY:
|
|
transitionTo(mLocalHotspotState);
|
|
break;
|
|
case STATE_TETHERED:
|
|
transitionTo(mTetheredState);
|
|
break;
|
|
default:
|
|
mLog.e("Invalid tethering interface serving state specified.");
|
|
}
|
|
break;
|
|
case CMD_INTERFACE_DOWN:
|
|
transitionTo(mUnavailableState);
|
|
break;
|
|
case CMD_IPV6_TETHER_UPDATE:
|
|
updateUpstreamIPv6LinkProperties((LinkProperties) message.obj);
|
|
break;
|
|
default:
|
|
return NOT_HANDLED;
|
|
}
|
|
return HANDLED;
|
|
}
|
|
}
|
|
|
|
class BaseServingState extends State {
|
|
@Override
|
|
public void enter() {
|
|
if (!startIPv4()) {
|
|
mLastError = ConnectivityManager.TETHER_ERROR_IFACE_CFG_ERROR;
|
|
return;
|
|
}
|
|
|
|
try {
|
|
mNMService.tetherInterface(mIfaceName);
|
|
} catch (Exception e) {
|
|
mLog.e("Error Tethering: " + e);
|
|
mLastError = ConnectivityManager.TETHER_ERROR_TETHER_IFACE_ERROR;
|
|
return;
|
|
}
|
|
|
|
if (!startIPv6()) {
|
|
mLog.e("Failed to startIPv6");
|
|
// TODO: Make this a fatal error once Bluetooth IPv6 is sorted.
|
|
return;
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void exit() {
|
|
// 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.
|
|
stopIPv6();
|
|
|
|
try {
|
|
mNMService.untetherInterface(mIfaceName);
|
|
} catch (Exception e) {
|
|
mLastError = ConnectivityManager.TETHER_ERROR_UNTETHER_IFACE_ERROR;
|
|
mLog.e("Failed to untether interface: " + e);
|
|
}
|
|
|
|
stopIPv4();
|
|
|
|
resetLinkProperties();
|
|
}
|
|
|
|
@Override
|
|
public boolean processMessage(Message message) {
|
|
logMessage(this, message.what);
|
|
switch (message.what) {
|
|
case CMD_TETHER_UNREQUESTED:
|
|
transitionTo(mInitialState);
|
|
if (DBG) Log.d(TAG, "Untethered (unrequested)" + mIfaceName);
|
|
break;
|
|
case CMD_INTERFACE_DOWN:
|
|
transitionTo(mUnavailableState);
|
|
if (DBG) Log.d(TAG, "Untethered (ifdown)" + mIfaceName);
|
|
break;
|
|
case CMD_IPV6_TETHER_UPDATE:
|
|
updateUpstreamIPv6LinkProperties((LinkProperties) message.obj);
|
|
sendLinkProperties();
|
|
break;
|
|
case CMD_IP_FORWARDING_ENABLE_ERROR:
|
|
case CMD_IP_FORWARDING_DISABLE_ERROR:
|
|
case CMD_START_TETHERING_ERROR:
|
|
case CMD_STOP_TETHERING_ERROR:
|
|
case CMD_SET_DNS_FORWARDERS_ERROR:
|
|
mLastError = ConnectivityManager.TETHER_ERROR_MASTER_ERROR;
|
|
transitionTo(mInitialState);
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Handling errors in BaseServingState.enter() by transitioning is
|
|
// problematic because transitioning during a multi-state jump yields
|
|
// a Log.wtf(). Ultimately, there should be only one ServingState,
|
|
// and forwarding and NAT rules should be handled by a coordinating
|
|
// functional element outside of IpServer.
|
|
class LocalHotspotState extends BaseServingState {
|
|
@Override
|
|
public void enter() {
|
|
super.enter();
|
|
if (mLastError != ConnectivityManager.TETHER_ERROR_NO_ERROR) {
|
|
transitionTo(mInitialState);
|
|
}
|
|
|
|
if (DBG) Log.d(TAG, "Local hotspot " + mIfaceName);
|
|
sendInterfaceState(STATE_LOCAL_ONLY);
|
|
}
|
|
|
|
@Override
|
|
public boolean processMessage(Message message) {
|
|
if (super.processMessage(message)) return true;
|
|
|
|
logMessage(this, message.what);
|
|
switch (message.what) {
|
|
case CMD_TETHER_REQUESTED:
|
|
mLog.e("CMD_TETHER_REQUESTED while in local-only hotspot mode.");
|
|
break;
|
|
case CMD_TETHER_CONNECTION_CHANGED:
|
|
// Ignored in local hotspot state.
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Handling errors in BaseServingState.enter() by transitioning is
|
|
// problematic because transitioning during a multi-state jump yields
|
|
// a Log.wtf(). Ultimately, there should be only one ServingState,
|
|
// and forwarding and NAT rules should be handled by a coordinating
|
|
// functional element outside of IpServer.
|
|
class TetheredState extends BaseServingState {
|
|
@Override
|
|
public void enter() {
|
|
super.enter();
|
|
if (mLastError != ConnectivityManager.TETHER_ERROR_NO_ERROR) {
|
|
transitionTo(mInitialState);
|
|
}
|
|
|
|
if (DBG) Log.d(TAG, "Tethered " + mIfaceName);
|
|
sendInterfaceState(STATE_TETHERED);
|
|
}
|
|
|
|
@Override
|
|
public void exit() {
|
|
cleanupUpstream();
|
|
super.exit();
|
|
}
|
|
|
|
private void cleanupUpstream() {
|
|
if (mUpstreamIfaceSet == null) return;
|
|
|
|
for (String ifname : mUpstreamIfaceSet.ifnames) cleanupUpstreamInterface(ifname);
|
|
mUpstreamIfaceSet = null;
|
|
}
|
|
|
|
private void cleanupUpstreamInterface(String upstreamIface) {
|
|
// Note that we don't care about errors here.
|
|
// Sometimes interfaces are gone before we get
|
|
// to remove their rules, which generates errors.
|
|
// Just do the best we can.
|
|
try {
|
|
// About to tear down NAT; gather remaining statistics.
|
|
mStatsService.forceUpdate();
|
|
} catch (Exception e) {
|
|
if (VDBG) Log.e(TAG, "Exception in forceUpdate: " + e.toString());
|
|
}
|
|
try {
|
|
mNMService.stopInterfaceForwarding(mIfaceName, upstreamIface);
|
|
} catch (Exception e) {
|
|
if (VDBG) Log.e(TAG, "Exception in removeInterfaceForward: " + e.toString());
|
|
}
|
|
try {
|
|
mNMService.disableNat(mIfaceName, upstreamIface);
|
|
} catch (Exception e) {
|
|
if (VDBG) Log.e(TAG, "Exception in disableNat: " + e.toString());
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public boolean processMessage(Message message) {
|
|
if (super.processMessage(message)) return true;
|
|
|
|
logMessage(this, message.what);
|
|
switch (message.what) {
|
|
case CMD_TETHER_REQUESTED:
|
|
mLog.e("CMD_TETHER_REQUESTED while already tethering.");
|
|
break;
|
|
case CMD_TETHER_CONNECTION_CHANGED:
|
|
final InterfaceSet newUpstreamIfaceSet = (InterfaceSet) message.obj;
|
|
if (noChangeInUpstreamIfaceSet(newUpstreamIfaceSet)) {
|
|
if (VDBG) Log.d(TAG, "Connection changed noop - dropping");
|
|
break;
|
|
}
|
|
|
|
if (newUpstreamIfaceSet == null) {
|
|
cleanupUpstream();
|
|
break;
|
|
}
|
|
|
|
for (String removed : upstreamInterfacesRemoved(newUpstreamIfaceSet)) {
|
|
cleanupUpstreamInterface(removed);
|
|
}
|
|
|
|
final Set<String> added = upstreamInterfacesAdd(newUpstreamIfaceSet);
|
|
// This makes the call to cleanupUpstream() in the error
|
|
// path for any interface neatly cleanup all the interfaces.
|
|
mUpstreamIfaceSet = newUpstreamIfaceSet;
|
|
|
|
for (String ifname : added) {
|
|
try {
|
|
mNMService.enableNat(mIfaceName, ifname);
|
|
mNMService.startInterfaceForwarding(mIfaceName, ifname);
|
|
} catch (Exception e) {
|
|
mLog.e("Exception enabling NAT: " + e);
|
|
cleanupUpstream();
|
|
mLastError = ConnectivityManager.TETHER_ERROR_ENABLE_NAT_ERROR;
|
|
transitionTo(mInitialState);
|
|
return true;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
private boolean noChangeInUpstreamIfaceSet(InterfaceSet newIfaces) {
|
|
if (mUpstreamIfaceSet == null && newIfaces == null) return true;
|
|
if (mUpstreamIfaceSet != null && newIfaces != null) {
|
|
return mUpstreamIfaceSet.equals(newIfaces);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
private Set<String> upstreamInterfacesRemoved(InterfaceSet newIfaces) {
|
|
if (mUpstreamIfaceSet == null) return new HashSet<>();
|
|
|
|
final HashSet<String> removed = new HashSet<>(mUpstreamIfaceSet.ifnames);
|
|
removed.removeAll(newIfaces.ifnames);
|
|
return removed;
|
|
}
|
|
|
|
private Set<String> upstreamInterfacesAdd(InterfaceSet newIfaces) {
|
|
final HashSet<String> added = new HashSet<>(newIfaces.ifnames);
|
|
if (mUpstreamIfaceSet != null) added.removeAll(mUpstreamIfaceSet.ifnames);
|
|
return added;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This state is terminal for the per interface state machine. At this
|
|
* point, the master state machine should have removed this interface
|
|
* specific state machine from its list of possible recipients of
|
|
* tethering requests. The state machine itself will hang around until
|
|
* the garbage collector finds it.
|
|
*/
|
|
class UnavailableState extends State {
|
|
@Override
|
|
public void enter() {
|
|
mLastError = ConnectivityManager.TETHER_ERROR_NO_ERROR;
|
|
sendInterfaceState(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] = getRandomSanitizedByte(DOUG_ADAMS, asByte(0), asByte(1));
|
|
try {
|
|
return Inet6Address.getByAddress(null, dnsBytes, 0);
|
|
} catch (UnknownHostException e) {
|
|
Slog.wtf(TAG, "Failed to construct Inet6Address from: " + localPrefix);
|
|
return null;
|
|
}
|
|
}
|
|
|
|
private static byte getRandomSanitizedByte(byte dflt, byte... excluded) {
|
|
final byte random = (byte) (new Random()).nextInt();
|
|
for (int value : excluded) {
|
|
if (random == value) return dflt;
|
|
}
|
|
return random;
|
|
}
|
|
}
|