Ensure known good state when starting. (226db197) · Commits · e / os / android_frameworks_base

services/net/java/android/net/ip/IpManager.java

+89 −20

Original line number	Diff line number	Diff line
		@@ -382,6 +382,7 @@ public class IpManager extends StateMachine {
		private final State mStoppedState = new StoppedState();
		private final State mStoppingState = new StoppingState();
		private final State mStartedState = new StartedState();
		private final State mRunningState = new RunningState();

		private final String mTag;
		private final Context mContext;
		@@ -476,6 +477,7 @@ public class IpManager extends StateMachine {
		// Super simple StateMachine.
		addState(mStoppedState);
		addState(mStartedState);
		addState(mRunningState, mStartedState);
		addState(mStoppingState);

		setInitialState(mStoppedState);
		@@ -570,7 +572,7 @@ public class IpManager extends StateMachine {
		pw.decreaseIndent();

		pw.println();
		pw.println("StateMachine dump:");
		pw.println(mTag + " StateMachine dump:");
		pw.increaseIndent();
		mLocalLog.readOnlyLocalLog().dump(fd, pw, args);
		pw.decreaseIndent();
		@@ -768,6 +770,11 @@ public class IpManager extends StateMachine {
		// - IPv6 addresses
		// - IPv6 routes
		// - IPv6 DNS servers
		//
		// N.B.: this is fundamentally race-prone and should be fixed by
		// changing NetlinkTracker from a hybrid edge/level model to an
		// edge-only model, or by giving IpManager its own netlink socket(s)
		// so as to track all required information directly.
		LinkProperties netlinkLinkProperties = mNetlinkTracker.getLinkProperties();
		newLp.setLinkAddresses(netlinkLinkProperties.getLinkAddresses());
		for (RouteInfo route : netlinkLinkProperties.getRoutes()) {
		@@ -939,17 +946,31 @@ public class IpManager extends StateMachine {
		return true;
		}

		private void stopAllIP() {
		// We don't need to worry about routes, just addresses, because:
		// - disableIpv6() will clear autoconf IPv6 routes as well, and
		// - we don't get IPv4 routes from netlink
		// so we neither react to nor need to wait for changes in either.

		class StoppedState extends State {
		@Override
		public void enter() {
		try {
		mNwService.disableIpv6(mInterfaceName);
		} catch (Exception e) {
		Log.e(mTag, "Failed to disable IPv6" + e);
		}

		try {
		mNwService.clearInterfaceAddresses(mInterfaceName);
		} catch (Exception e) {
		Log.e(mTag, "Failed to clear addresses or disable IPv6" + e);
		Log.e(mTag, "Failed to clear addresses " + e);
		}
		}


		class StoppedState extends State {
		@Override
		public void enter() {
		stopAllIP();

		resetLinkProperties();
		if (mStartTimeMillis > 0) {
		recordMetric(IpManagerEvent.COMPLETE_LIFECYCLE);
		@@ -1023,12 +1044,71 @@ public class IpManager extends StateMachine {
		}

		class StartedState extends State {
		private boolean mDhcpActionInFlight;

		@Override
		public void enter() {
		mStartTimeMillis = SystemClock.elapsedRealtime();

		if (mConfiguration.mProvisioningTimeoutMs > 0) {
		final long alarmTime = SystemClock.elapsedRealtime() +
		mConfiguration.mProvisioningTimeoutMs;
		mProvisioningTimeoutAlarm.schedule(alarmTime);
		}

		if (readyToProceed()) {
		transitionTo(mRunningState);
		} else {
		// Clear all IPv4 and IPv6 before proceeding to RunningState.
		// Clean up any leftover state from an abnormal exit from
		// tethering or during an IpManager restart.
		stopAllIP();
		}
		}

		@Override
		public void exit() {
		mProvisioningTimeoutAlarm.cancel();
		}

		@Override
		public boolean processMessage(Message msg) {
		switch (msg.what) {
		case CMD_STOP:
		transitionTo(mStoppingState);
		break;

		case EVENT_NETLINK_LINKPROPERTIES_CHANGED:
		handleLinkPropertiesUpdate(NO_CALLBACKS);
		if (readyToProceed()) {
		transitionTo(mRunningState);
		}
		break;

		case EVENT_PROVISIONING_TIMEOUT:
		handleProvisioningFailure();
		break;

		default:
		// It's safe to process messages out of order because the
		// only message that can both
		// a) be received at this time and
		// b) affect provisioning state
		// is EVENT_NETLINK_LINKPROPERTIES_CHANGED (handled above).
		deferMessage(msg);
		}
		return HANDLED;
		}

		boolean readyToProceed() {
		return (!mLinkProperties.hasIPv4Address() &&
		!mLinkProperties.hasGlobalIPv6Address());
		}
		}

		class RunningState extends State {
		private boolean mDhcpActionInFlight;

		@Override
		public void enter() {
		mApfFilter = ApfFilter.maybeCreate(mConfiguration.mApfCapabilities, mNetworkInterface,
		mCallback, mMulticastFiltering);
		// TODO: investigate the effects of any multicast filtering racing/interfering with the
		@@ -1037,12 +1117,6 @@ public class IpManager extends StateMachine {
		mCallback.setFallbackMulticastFilter(mMulticastFiltering);
		}

		if (mConfiguration.mProvisioningTimeoutMs > 0) {
		final long alarmTime = SystemClock.elapsedRealtime() +
		mConfiguration.mProvisioningTimeoutMs;
		mProvisioningTimeoutAlarm.schedule(alarmTime);
		}

		if (mConfiguration.mEnableIPv6) {
		// TODO: Consider transitionTo(mStoppingState) if this fails.
		startIPv6();
		@@ -1070,7 +1144,6 @@ public class IpManager extends StateMachine {

		@Override
		public void exit() {
		mProvisioningTimeoutAlarm.cancel();
		stopDhcpAction();

		if (mIpReachabilityMonitor != null) {
		@@ -1167,10 +1240,6 @@ public class IpManager extends StateMachine {
		break;
		}

		case EVENT_PROVISIONING_TIMEOUT:
		handleProvisioningFailure();
		break;

		case EVENT_DHCPACTION_TIMEOUT:
		stopDhcpAction();
		break;