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Commit 5c0b10a4 authored by Christopher Wiley's avatar Christopher Wiley
Browse files

Tethering: Own WiFi tethering state and lifetime 

( cherry-pick of f1315c3c )

- Add logic to Tethering to track whether the user has requested
  tethering via WiFi.
- Subscribe to intents regarding soft AP state to enable and
  disable tethering when the AP comes up or goes down.
- Refactor IP configuration logic to do configuration for WiFi
  as well as USB.

Bug: 29054780
Test: WiFi tethering continues to work on angler
      Tethering related unittests continue to pass.

Change-Id: I6eff2573ca3fd11fabcf138c468ba517ff2daf65
parent e9490390

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

+105 −63
Original line number Diff line number Diff line
@@ -128,7 +128,7 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 


    private Map<String, TetherInterfaceStateMachine> mIfaces; // all tethered/tetherable ifaces



    private BroadcastReceiver mStateReceiver;

    private final BroadcastReceiver mStateReceiver;



    // {@link ComponentName} of the Service used to run tether provisioning.

    private static final ComponentName TETHER_SERVICE = ComponentName.unflattenFromString(Resources
@@ -163,6 +163,9 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
    private boolean mUsbTetherRequested; // true if USB tethering should be started

                                         // when RNDIS is enabled



    // True iff WiFi tethering should be started when soft AP is ready.

    private boolean mWifiTetherRequested;



    public Tethering(Context context, INetworkManagementService nmService,

            INetworkStatsService statsService) {

        mContext = context;
@@ -184,6 +187,7 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
        IntentFilter filter = new IntentFilter();

        filter.addAction(UsbManager.ACTION_USB_STATE);

        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);

        filter.addAction(WifiManager.WIFI_AP_STATE_CHANGED_ACTION);

        filter.addAction(Intent.ACTION_CONFIGURATION_CHANGED);

        mContext.registerReceiver(mStateReceiver, filter);
@@ -245,29 +249,22 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
        // Never called directly: only called from interfaceLinkStateChanged.

        // See NetlinkHandler.cpp:71.

        if (VDBG) Log.d(TAG, "interfaceStatusChanged " + iface + ", " + up);

        boolean found = false;

        boolean usb = false;

        synchronized (mPublicSync) {

            if (isWifi(iface)) {

                found = true;

            } else if (isUsb(iface)) {

                found = true;

                usb = true;

            } else if (isBluetooth(iface)) {

                found = true;

            int interfaceType = ifaceNameToType(iface);

            if (interfaceType == ConnectivityManager.TETHERING_INVALID) {

                return;

            }

            if (found == false) return;



            TetherInterfaceStateMachine sm = mIfaces.get(iface);

            if (up) {

                if (sm == null) {

                    sm = new TetherInterfaceStateMachine(iface, mLooper, usb,

                    sm = new TetherInterfaceStateMachine(iface, mLooper, interfaceType,

                            mNMService, mStatsService, this);

                    mIfaces.put(iface, sm);

                    sm.start();

                }

            } else {

                if (isUsb(iface)) {

                if (interfaceType == ConnectivityManager.TETHERING_USB) {

                    // ignore usb0 down after enabling RNDIS

                    // we will handle disconnect in interfaceRemoved instead

                    if (VDBG) Log.d(TAG, "ignore interface down for " + iface);
@@ -293,7 +290,7 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
        }

    }



    public boolean isWifi(String iface) {

    private boolean isWifi(String iface) {

        synchronized (mPublicSync) {

            for (String regex : mTetherableWifiRegexs) {

                if (iface.matches(regex)) return true;
@@ -302,7 +299,7 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
        }

    }



    public boolean isBluetooth(String iface) {

    private boolean isBluetooth(String iface) {

        synchronized (mPublicSync) {

            for (String regex : mTetherableBluetoothRegexs) {

                if (iface.matches(regex)) return true;
@@ -311,23 +308,23 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
        }

    }



    private int ifaceNameToType(String iface) {

        if (isWifi(iface)) {

            return ConnectivityManager.TETHERING_WIFI;

        } else if (isUsb(iface)) {

            return ConnectivityManager.TETHERING_USB;

        } else if (isBluetooth(iface)) {

            return ConnectivityManager.TETHERING_BLUETOOTH;

        }

        return ConnectivityManager.TETHERING_INVALID;

    }



    @Override

    public void interfaceAdded(String iface) {

        if (VDBG) Log.d(TAG, "interfaceAdded " + iface);

        boolean found = false;

        boolean usb = false;

        synchronized (mPublicSync) {

            if (isWifi(iface)) {

                found = true;

            }

            if (isUsb(iface)) {

                found = true;

                usb = true;

            }

            if (isBluetooth(iface)) {

                found = true;

            }

            if (found == false) {

            int interfaceType = ifaceNameToType(iface);

            if (interfaceType == ConnectivityManager.TETHERING_INVALID) {

                if (VDBG) Log.d(TAG, iface + " is not a tetherable iface, ignoring");

                return;

            }
@@ -337,7 +334,7 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
                if (VDBG) Log.d(TAG, "active iface (" + iface + ") reported as added, ignoring");

                return;

            }

            sm = new TetherInterfaceStateMachine(iface, mLooper, usb,

            sm = new TetherInterfaceStateMachine(iface, mLooper, interfaceType,

                    mNMService, mStatsService, this);

            mIfaces.put(iface, sm);

            sm.start();
@@ -412,24 +409,19 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
     * for the specified interface.

     */

    private void enableTetheringInternal(int type, boolean enable, ResultReceiver receiver) {

        boolean isProvisioningRequired = isTetherProvisioningRequired();

        boolean isProvisioningRequired = enable && isTetherProvisioningRequired();

        int result;

        switch (type) {

            case ConnectivityManager.TETHERING_WIFI:

                final WifiManager wifiManager =

                        (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);

                if (wifiManager.setWifiApEnabled(null, enable)) {

                    sendTetherResult(receiver, ConnectivityManager.TETHER_ERROR_NO_ERROR);

                    if (enable && isProvisioningRequired) {

                result = setWifiTethering(enable);

                if (isProvisioningRequired && result == ConnectivityManager.TETHER_ERROR_NO_ERROR) {

                    scheduleProvisioningRechecks(type);

                }

                } else{

                    sendTetherResult(receiver, ConnectivityManager.TETHER_ERROR_MASTER_ERROR);

                }

                sendTetherResult(receiver, result);

                break;

            case ConnectivityManager.TETHERING_USB:

                int result = setUsbTethering(enable);

                if (enable && isProvisioningRequired &&

                        result == ConnectivityManager.TETHER_ERROR_NO_ERROR) {

                result = setUsbTethering(enable);

                if (isProvisioningRequired && result == ConnectivityManager.TETHER_ERROR_NO_ERROR) {

                    scheduleProvisioningRechecks(type);

                }

                sendTetherResult(receiver, result);
@@ -449,6 +441,20 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
        }

    }



    private int setWifiTethering(final boolean enable) {

        synchronized (mPublicSync) {

            // Note that we're maintaining a predicate that mWifiTetherRequested always matches

            // our last request to WifiManager re: its AP enabled status.

            mWifiTetherRequested = enable;

            final WifiManager wifiManager =

                    (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);

            if (wifiManager.setWifiApEnabled(null /* use existing wifi config */, enable)) {

                return ConnectivityManager.TETHER_ERROR_NO_ERROR;

            }

            return ConnectivityManager.TETHER_ERROR_MASTER_ERROR;

        }

    }



    private void setBluetoothTethering(final boolean enable, final ResultReceiver receiver) {

        final BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();

        if (adapter == null || !adapter.isEnabled()) {
@@ -770,7 +776,7 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
                    mRndisEnabled = intent.getBooleanExtra(UsbManager.USB_FUNCTION_RNDIS, false);

                    // start tethering if we have a request pending

                    if (usbConnected && mRndisEnabled && mUsbTetherRequested) {

                        tetherUsb(true);

                        tetherMatchingInterfaces(true, ConnectivityManager.TETHERING_USB);

                    }

                    mUsbTetherRequested = false;

                }
@@ -782,31 +788,72 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
                    if (VDBG) Log.d(TAG, "Tethering got CONNECTIVITY_ACTION");

                    mTetherMasterSM.sendMessage(TetherMasterSM.CMD_UPSTREAM_CHANGED);

                }

            } else if (action.equals(WifiManager.WIFI_AP_STATE_CHANGED_ACTION)) {

                synchronized (Tethering.this.mPublicSync) {

                    if (!mWifiTetherRequested) {

                        // We only care when we're trying to tether via our WiFi interface.

                        return;

                    }

                    int curState =  intent.getIntExtra(WifiManager.EXTRA_WIFI_AP_STATE,

                            WifiManager.WIFI_AP_STATE_DISABLED);

                    switch (curState) {

                        case WifiManager.WIFI_AP_STATE_ENABLING:

                            // We can see this state on the way to both enabled and failure states.

                            break;

                        case WifiManager.WIFI_AP_STATE_ENABLED:

                            // Tell an appropriate interface state machine that it should tether.

                            tetherMatchingInterfaces(true, ConnectivityManager.TETHERING_WIFI);

                            break;

                        case WifiManager.WIFI_AP_STATE_DISABLED:

                        case WifiManager.WIFI_AP_STATE_DISABLING:

                        case WifiManager.WIFI_AP_STATE_FAILED:

                        default:

                            if (DBG) {

                                Log.d(TAG, "Canceling WiFi tethering request - AP_STATE=" +

                                    curState);

                            }

                            // Tell an appropriate interface state machine that

                            // it needs to tear itself down.

                            tetherMatchingInterfaces(false, ConnectivityManager.TETHERING_WIFI);

                            setWifiTethering(false);

                            break;

                    }

                }

            } else if (action.equals(Intent.ACTION_CONFIGURATION_CHANGED)) {

                updateConfiguration();

            }

        }

    }



    private void tetherUsb(boolean enable) {

        if (VDBG) Log.d(TAG, "tetherUsb " + enable);

    private void tetherMatchingInterfaces(boolean enable, int interfaceType) {

        if (VDBG) Log.d(TAG, "tetherMatchingInterfaces(" + enable + ", " + interfaceType + ")");



        String[] ifaces = new String[0];

        String[] ifaces = null;

        try {

            ifaces = mNMService.listInterfaces();

        } catch (Exception e) {

            Log.e(TAG, "Error listing Interfaces", e);

            return;

        }

        String chosenIface = null;

        if (ifaces != null) {

            for (String iface : ifaces) {

            if (isUsb(iface)) {

                int result = (enable ? tether(iface) : untether(iface));

                if (result == ConnectivityManager.TETHER_ERROR_NO_ERROR) {

                    return;

                if (ifaceNameToType(iface) == interfaceType) {

                    chosenIface = iface;

                    break;

                }

            }

        }

        Log.e(TAG, "unable start or stop USB tethering");

        if (chosenIface == null) {

            Log.e(TAG, "could not find iface of type " + interfaceType);

            return;

        }



        int result = (enable ? tether(chosenIface) : untether(chosenIface));

        if (result != ConnectivityManager.TETHER_ERROR_NO_ERROR) {

            Log.e(TAG, "unable start or stop tethering on iface " + chosenIface);

            return;

        }

    }



    // TODO - return copies so people can't tamper
@@ -831,7 +878,7 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
                if (mRndisEnabled) {

                    final long ident = Binder.clearCallingIdentity();

                    try {

                        tetherUsb(true);

                        tetherMatchingInterfaces(true, ConnectivityManager.TETHERING_USB);

                    } finally {

                        Binder.restoreCallingIdentity(ident);

                    }
@@ -842,7 +889,7 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
            } else {

                final long ident = Binder.clearCallingIdentity();

                try {

                    tetherUsb(false);

                    tetherMatchingInterfaces(false, ConnectivityManager.TETHERING_USB);

                } finally {

                    Binder.restoreCallingIdentity(ident);

                }
@@ -1410,15 +1457,10 @@ public class Tethering extends BaseNetworkObserver implements IControlsTethering 
                                for (String iface : ifaces) {

                                    TetherInterfaceStateMachine sm = mIfaces.get(iface);

                                    if (sm != null && sm.isTethered()) {

                                        if (isUsb(iface)) {

                                            tethered.add(new Integer(

                                                    ConnectivityManager.TETHERING_USB));

                                        } else if (isWifi(iface)) {

                                            tethered.add(new Integer(

                                                    ConnectivityManager.TETHERING_WIFI));

                                        } else if (isBluetooth(iface)) {

                                            tethered.add(new Integer(

                                                    ConnectivityManager.TETHERING_BLUETOOTH));

                                        int interfaceType = ifaceNameToType(iface);

                                        if (interfaceType !=

                                                ConnectivityManager.TETHERING_INVALID) {

                                            tethered.add(new Integer(interfaceType));

                                        }

                                    }

                                }

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

+30 −19
Original line number Diff line number Diff line
@@ -43,6 +43,8 @@ import java.net.InetAddress; 
public class TetherInterfaceStateMachine extends StateMachine {

    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 static final int WIFI_HOST_IFACE_PREFIX_LENGTH = 24;



    private final static String TAG = "TetherInterfaceSM";

    private final static boolean DBG = false;
@@ -81,13 +83,13 @@ public class TetherInterfaceStateMachine extends StateMachine { 
    private final INetworkStatsService mStatsService;

    private final IControlsTethering mTetherController;



    private final boolean mUsb;

    private final String mIfaceName;

    private final int mInterfaceType;



    private int mLastError;

    private String mMyUpstreamIfaceName;  // may change over time



    public TetherInterfaceStateMachine(String ifaceName, Looper looper, boolean usb,

    public TetherInterfaceStateMachine(String ifaceName, Looper looper, int interfaceType,

                    INetworkManagementService nMService, INetworkStatsService statsService,

                    IControlsTethering tetherController) {

        super(ifaceName, looper);
@@ -95,7 +97,7 @@ public class TetherInterfaceStateMachine extends StateMachine { 
        mStatsService = statsService;

        mTetherController = tetherController;

        mIfaceName = ifaceName;

        mUsb = usb;

        mInterfaceType = interfaceType;

        setLastError(ConnectivityManager.TETHER_ERROR_NO_ERROR);



        mInitialState = new InitialState();
@@ -143,25 +145,38 @@ public class TetherInterfaceStateMachine extends StateMachine { 
    }



    // configured when we start tethering and unconfig'd on error or conclusion

    private boolean configureUsbIface(boolean enabled, String iface) {

        if (VDBG) Log.d(TAG, "configureUsbIface(" + enabled + ")");

    private boolean configureIfaceIp(boolean enabled) {

        if (VDBG) Log.d(TAG, "configureIfaceIp(" + enabled + ")");



        String ipAsString = null;

        int prefixLen = 0;

        if (mInterfaceType == ConnectivityManager.TETHERING_USB) {

            ipAsString = USB_NEAR_IFACE_ADDR;

            prefixLen = USB_PREFIX_LENGTH;

        } else if (mInterfaceType == ConnectivityManager.TETHERING_WIFI) {

            ipAsString = WIFI_HOST_IFACE_ADDR;

            prefixLen = WIFI_HOST_IFACE_PREFIX_LENGTH;

        } else {

            // Nothing to do, BT does this elsewhere.

            return true;

        }



        InterfaceConfiguration ifcg = null;

        try {

            ifcg = mNMService.getInterfaceConfig(iface);

            ifcg = mNMService.getInterfaceConfig(mIfaceName);

            if (ifcg != null) {

                InetAddress addr = NetworkUtils.numericToInetAddress(USB_NEAR_IFACE_ADDR);

                ifcg.setLinkAddress(new LinkAddress(addr, USB_PREFIX_LENGTH));

                InetAddress addr = NetworkUtils.numericToInetAddress(ipAsString);

                ifcg.setLinkAddress(new LinkAddress(addr, prefixLen));

                if (enabled) {

                    ifcg.setInterfaceUp();

                } else {

                    ifcg.setInterfaceDown();

                }

                ifcg.clearFlag("running");

                mNMService.setInterfaceConfig(iface, ifcg);

                mNMService.setInterfaceConfig(mIfaceName, ifcg);

            }

        } catch (Exception e) {

            Log.e(TAG, "Error configuring interface " + iface, e);

            Log.e(TAG, "Error configuring interface " + mIfaceName, e);

            return false;

        }
@@ -205,13 +220,11 @@ public class TetherInterfaceStateMachine extends StateMachine { 
    class TetheredState extends State {

        @Override

        public void enter() {

            if (mUsb) {

                if (!configureUsbIface(true, mIfaceName)) {

            if (!configureIfaceIp(true)) {

                setLastError(ConnectivityManager.TETHER_ERROR_IFACE_CFG_ERROR);

                transitionTo(mInitialState);

                return;

            }

            }



            try {

                mNMService.tetherInterface(mIfaceName);
@@ -242,9 +255,7 @@ public class TetherInterfaceStateMachine extends StateMachine { 
                Log.e(TAG, "Failed to untether interface: " + ee.toString());

            }



            if (mUsb) {

                configureUsbIface(false, mIfaceName);

            }

            configureIfaceIp(false);

        }



        private void cleanupUpstream() {

services/tests/servicestests/src/com/android/server/connectivity/tethering/TetherInterfaceStateMachineTest.java

+18 −17
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ import static org.mockito.Mockito.verify; 
import static org.mockito.Mockito.verifyNoMoreInteractions;

import static org.mockito.Mockito.when;



import android.net.ConnectivityManager;

import android.net.INetworkStatsService;

import android.net.InterfaceConfiguration;

import android.os.INetworkManagementService;
@@ -56,8 +57,8 @@ public class TetherInterfaceStateMachineTest { 
    private final TestLooper mLooper = new TestLooper();

    private TetherInterfaceStateMachine mTestedSm;



    private void initStateMachine(boolean isUsb) throws Exception {

        mTestedSm = new TetherInterfaceStateMachine(IFACE_NAME, mLooper.getLooper(), isUsb,

    private void initStateMachine(int interfaceType) throws Exception {

        mTestedSm = new TetherInterfaceStateMachine(IFACE_NAME, mLooper.getLooper(), interfaceType,

                mNMService, mStatsService, mTetherHelper);

        mTestedSm.start();

        // Starting the state machine always puts us in a consistent state and notifies
@@ -67,8 +68,8 @@ public class TetherInterfaceStateMachineTest { 
        when(mNMService.getInterfaceConfig(IFACE_NAME)).thenReturn(mInterfaceConfiguration);

    }



    private void initTetheredStateMachine(boolean isUsb, String upstreamIface) throws Exception {

        initStateMachine(isUsb);

    private void initTetheredStateMachine(int interfaceType, String upstreamIface) throws Exception {

        initStateMachine(interfaceType);

        dispatchCommand(TetherInterfaceStateMachine.CMD_TETHER_REQUESTED);

        if (upstreamIface != null) {

            dispatchTetherConnectionChanged(upstreamIface);
@@ -84,8 +85,8 @@ public class TetherInterfaceStateMachineTest { 


    @Test

    public void startsOutAvailable() {

        mTestedSm = new TetherInterfaceStateMachine(IFACE_NAME, mLooper.getLooper(), false,

                mNMService, mStatsService, mTetherHelper);

        mTestedSm = new TetherInterfaceStateMachine(IFACE_NAME, mLooper.getLooper(),

                ConnectivityManager.TETHERING_BLUETOOTH, mNMService, mStatsService, mTetherHelper);

        mTestedSm.start();

        mLooper.dispatchAll();

        assertTrue("Should start out available for tethering", mTestedSm.isAvailable());
@@ -97,7 +98,7 @@ public class TetherInterfaceStateMachineTest { 


    @Test

    public void shouldDoNothingUntilRequested() throws Exception {

        initStateMachine(false);

        initStateMachine(ConnectivityManager.TETHERING_BLUETOOTH);

        final int [] NOOP_COMMANDS = {

            TetherInterfaceStateMachine.CMD_TETHER_UNREQUESTED,

            TetherInterfaceStateMachine.CMD_IP_FORWARDING_ENABLE_ERROR,
@@ -117,7 +118,7 @@ public class TetherInterfaceStateMachineTest { 


    @Test

    public void handlesImmediateInterfaceDown() throws Exception {

        initStateMachine(false);

        initStateMachine(ConnectivityManager.TETHERING_BLUETOOTH);

        dispatchCommand(TetherInterfaceStateMachine.CMD_INTERFACE_DOWN);

        verify(mTetherHelper).sendTetherStateChangedBroadcast();

        verifyNoMoreInteractions(mNMService, mStatsService, mTetherHelper);
@@ -129,7 +130,7 @@ public class TetherInterfaceStateMachineTest { 


    @Test

    public void canBeTethered() throws Exception {

        initStateMachine(false);

        initStateMachine(ConnectivityManager.TETHERING_BLUETOOTH);

        dispatchCommand(TetherInterfaceStateMachine.CMD_TETHER_REQUESTED);

        InOrder inOrder = inOrder(mTetherHelper, mNMService);

        inOrder.verify(mTetherHelper).notifyInterfaceTetheringReadiness(true, mTestedSm);
@@ -144,7 +145,7 @@ public class TetherInterfaceStateMachineTest { 


    @Test

    public void canUnrequestTethering() throws Exception {

        initTetheredStateMachine(false, null);

        initTetheredStateMachine(ConnectivityManager.TETHERING_BLUETOOTH, null);



        dispatchCommand(TetherInterfaceStateMachine.CMD_TETHER_UNREQUESTED);

        InOrder inOrder = inOrder(mNMService, mStatsService, mTetherHelper);
@@ -159,7 +160,7 @@ public class TetherInterfaceStateMachineTest { 


    @Test

    public void canBeTetheredAsUsb() throws Exception {

        initStateMachine(true);

        initStateMachine(ConnectivityManager.TETHERING_USB);



        dispatchCommand(TetherInterfaceStateMachine.CMD_TETHER_REQUESTED);

        InOrder inOrder = inOrder(mTetherHelper, mNMService);
@@ -177,7 +178,7 @@ public class TetherInterfaceStateMachineTest { 


    @Test

    public void handlesFirstUpstreamChange() throws Exception {

        initTetheredStateMachine(false, null);

        initTetheredStateMachine(ConnectivityManager.TETHERING_BLUETOOTH, null);



        // Telling the state machine about its upstream interface triggers a little more configuration.

        dispatchTetherConnectionChanged(UPSTREAM_IFACE);
@@ -192,7 +193,7 @@ public class TetherInterfaceStateMachineTest { 


    @Test

    public void handlesChangingUpstream() throws Exception {

        initTetheredStateMachine(false, UPSTREAM_IFACE);

        initTetheredStateMachine(ConnectivityManager.TETHERING_BLUETOOTH, UPSTREAM_IFACE);



        dispatchTetherConnectionChanged(UPSTREAM_IFACE2);

        InOrder inOrder = inOrder(mNMService, mStatsService);
@@ -209,7 +210,7 @@ public class TetherInterfaceStateMachineTest { 


    @Test

    public void canUnrequestTetheringWithUpstream() throws Exception {

        initTetheredStateMachine(false, UPSTREAM_IFACE);

        initTetheredStateMachine(ConnectivityManager.TETHERING_BLUETOOTH, UPSTREAM_IFACE);



        dispatchCommand(TetherInterfaceStateMachine.CMD_TETHER_UNREQUESTED);

        InOrder inOrder = inOrder(mNMService, mStatsService, mTetherHelper);
@@ -228,7 +229,7 @@ public class TetherInterfaceStateMachineTest { 
    @Test

    public void interfaceDownLeadsToUnavailable() throws Exception {

        for (boolean shouldThrow : new boolean[]{true, false}) {

            initTetheredStateMachine(true, null);

            initTetheredStateMachine(ConnectivityManager.TETHERING_USB, null);



            if (shouldThrow) {

                doThrow(RemoteException.class).when(mNMService).untetherInterface(IFACE_NAME);
@@ -246,7 +247,7 @@ public class TetherInterfaceStateMachineTest { 


    @Test

    public void usbShouldBeTornDownOnTetherError() throws Exception {

        initStateMachine(true);

        initStateMachine(ConnectivityManager.TETHERING_USB);



        doThrow(RemoteException.class).when(mNMService).tetherInterface(IFACE_NAME);

        dispatchCommand(TetherInterfaceStateMachine.CMD_TETHER_REQUESTED);
@@ -263,7 +264,7 @@ public class TetherInterfaceStateMachineTest { 


    @Test

    public void shouldTearDownUsbOnUpstreamError() throws Exception {

        initTetheredStateMachine(true, null);

        initTetheredStateMachine(ConnectivityManager.TETHERING_USB, null);



        doThrow(RemoteException.class).when(mNMService).enableNat(anyString(), anyString());

        dispatchTetherConnectionChanged(UPSTREAM_IFACE);