Perform VPN data stall recovery on unvalidated VPN network am: b4f300d70d am: 837c8f6729 (98c78624) · Commits · e / os / android_frameworks_base

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

+37 −56

Original line number	Diff line number	Diff line
		@@ -22,7 +22,6 @@ import static android.content.pm.PackageManager.PERMISSION_GRANTED;
		import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_METERED;
		import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_VPN;
		import static android.net.NetworkCapabilities.TRANSPORT_CELLULAR;
		import static android.net.NetworkCapabilities.TRANSPORT_VPN;
		import static android.net.RouteInfo.RTN_THROW;
		import static android.net.RouteInfo.RTN_UNREACHABLE;
		import static android.net.VpnManager.NOTIFICATION_CHANNEL_VPN;
		@@ -280,15 +279,22 @@ public class Vpn {
		private static final int VPN_DEFAULT_SCORE = 101;

		/**
		* The reset session timer for data stall. If a session has not successfully revalidated after
		* the delay, the session will be torn down and restarted in an attempt to recover. Delay
		* The recovery timer for data stall. If a session has not successfully revalidated after
		* the delay, the session will perform MOBIKE or be restarted in an attempt to recover. Delay
		* counter is reset on successful validation only.
		*
		* <p>The first {@code MOBIKE_RECOVERY_ATTEMPT} timers are used for performing MOBIKE.
		* System will perform session reset for the remaining timers.
		* <p>If retries have exceeded the length of this array, the last entry in the array will be
		* used as a repeating interval.
		*/
		private static final long[] DATA_STALL_RESET_DELAYS_SEC = {30L, 60L, 120L, 240L, 480L, 960L};

		// TODO: use ms instead to speed up the test.
		private static final long[] DATA_STALL_RECOVERY_DELAYS_SEC =
		{1L, 5L, 30L, 60L, 120L, 240L, 480L, 960L};
		/**
		* Maximum attempts to perform MOBIKE when the network is bad.
		*/
		private static final int MAX_MOBIKE_RECOVERY_ATTEMPT = 2;
		/**
		* The initial token value of IKE session.
		*/
		@@ -392,7 +398,6 @@ public class Vpn {
		private final UserManager mUserManager;

		private final VpnProfileStore mVpnProfileStore;
		protected boolean mDataStallSuspected = false;

		@VisibleForTesting
		VpnProfileStore getVpnProfileStore() {
		@@ -685,14 +690,14 @@ public class Vpn {
		}

		/**
		* Get the length of time to wait before resetting the ike session when a data stall is
		* suspected.
		* Get the length of time to wait before perform data stall recovery when the validation
		* result is bad.
		*/
		public long getDataStallResetSessionSeconds(int count) {
		if (count >= DATA_STALL_RESET_DELAYS_SEC.length) {
		return DATA_STALL_RESET_DELAYS_SEC[DATA_STALL_RESET_DELAYS_SEC.length - 1];
		public long getValidationFailRecoverySeconds(int count) {
		if (count >= DATA_STALL_RECOVERY_DELAYS_SEC.length) {
		return DATA_STALL_RECOVERY_DELAYS_SEC[DATA_STALL_RECOVERY_DELAYS_SEC.length - 1];
		} else {
		return DATA_STALL_RESET_DELAYS_SEC[count];
		return DATA_STALL_RECOVERY_DELAYS_SEC[count];
		}
		}

		@@ -3044,7 +3049,6 @@ public class Vpn {

		@Nullable private IkeSessionWrapper mSession;
		@Nullable private IkeSessionConnectionInfo mIkeConnectionInfo;
		@Nullable private VpnConnectivityDiagnosticsCallback mDiagnosticsCallback;

		// mMobikeEnabled can only be updated after IKE AUTH is finished.
		private boolean mMobikeEnabled = false;
		@@ -3055,7 +3059,7 @@ public class Vpn {
		* <p>This variable controls the retry delay, and is reset when the VPN pass network
		* validation.
		*/
		private int mDataStallRetryCount = 0;
		private int mValidationFailRetryCount = 0;

		/**
		* The number of attempts since the last successful connection.
		@@ -3136,15 +3140,6 @@ public class Vpn {
		mConnectivityManager.registerSystemDefaultNetworkCallback(mNetworkCallback,
		new Handler(mLooper));
		}

		// DiagnosticsCallback may return more than one alive VPNs, but VPN will filter based on
		// Network object.
		final NetworkRequest diagRequest = new NetworkRequest.Builder()
		.addTransportType(TRANSPORT_VPN)
		.removeCapability(NET_CAPABILITY_NOT_VPN).build();
		mDiagnosticsCallback = new VpnConnectivityDiagnosticsCallback();
		mConnectivityDiagnosticsManager.registerConnectivityDiagnosticsCallback(
		diagRequest, mExecutor, mDiagnosticsCallback);
		}

		private boolean isActiveNetwork(@Nullable Network network) {
		@@ -3875,39 +3870,12 @@ public class Vpn {
		}
		}

		class VpnConnectivityDiagnosticsCallback
		extends ConnectivityDiagnosticsManager.ConnectivityDiagnosticsCallback {
		// The callback runs in the executor thread.
		@Override
		public void onDataStallSuspected(
		ConnectivityDiagnosticsManager.DataStallReport report) {
		synchronized (Vpn.this) {
		// Ignore stale runner.
		if (mVpnRunner != Vpn.IkeV2VpnRunner.this) return;

		// Handle the report only for current VPN network. If data stall is already
		// reported, ignoring the other reports. It means that the stall is not
		// recovered by MOBIKE and should be on the way to reset the ike session.
		if (mNetworkAgent != null
		&& mNetworkAgent.getNetwork().equals(report.getNetwork())
		&& !mDataStallSuspected) {
		Log.d(TAG, "Data stall suspected");

		// Trigger MOBIKE.
		maybeMigrateIkeSessionAndUpdateVpnTransportInfo(mActiveNetwork);
		mDataStallSuspected = true;
		}
		}
		}
		}

		public void onValidationStatus(int status) {
		mEventChanges.log("[Validation] validation status " + status);
		if (status == NetworkAgent.VALIDATION_STATUS_VALID) {
		// No data stall now. Reset it.
		mExecutor.execute(() -> {
		mDataStallSuspected = false;
		mDataStallRetryCount = 0;
		mValidationFailRetryCount = 0;
		if (mScheduledHandleDataStallFuture != null) {
		Log.d(TAG, "Recovered from stall. Cancel pending reset action.");
		mScheduledHandleDataStallFuture.cancel(false /* mayInterruptIfRunning */);
		@@ -3918,8 +3886,21 @@ public class Vpn {
		// Skip other invalid status if the scheduled recovery exists.
		if (mScheduledHandleDataStallFuture != null) return;

		if (mValidationFailRetryCount < MAX_MOBIKE_RECOVERY_ATTEMPT) {
		Log.d(TAG, "Validation failed");

		// Trigger MOBIKE to recover first.
		mExecutor.schedule(() -> {
		maybeMigrateIkeSessionAndUpdateVpnTransportInfo(mActiveNetwork);
		}, mDeps.getValidationFailRecoverySeconds(mValidationFailRetryCount++),
		TimeUnit.SECONDS);
		return;
		}

		// Data stall is not recovered by MOBIKE. Try to reset session to recover it.
		mScheduledHandleDataStallFuture = mExecutor.schedule(() -> {
		if (mDataStallSuspected) {
		// Only perform the recovery when the network is still bad.
		if (mValidationFailRetryCount > 0) {
		Log.d(TAG, "Reset session to recover stalled network");
		// This will reset old state if it exists.
		startIkeSession(mActiveNetwork);
		@@ -3928,7 +3909,9 @@ public class Vpn {
		// Reset mScheduledHandleDataStallFuture since it's already run on executor
		// thread.
		mScheduledHandleDataStallFuture = null;
		}, mDeps.getDataStallResetSessionSeconds(mDataStallRetryCount++), TimeUnit.SECONDS);
		// TODO: compute the delay based on the last recovery timestamp
		}, mDeps.getValidationFailRecoverySeconds(mValidationFailRetryCount++),
		TimeUnit.SECONDS);
		}
		}

		@@ -4231,8 +4214,6 @@ public class Vpn {
		mCarrierConfigManager.unregisterCarrierConfigChangeListener(
		mCarrierConfigChangeListener);
		mConnectivityManager.unregisterNetworkCallback(mNetworkCallback);
		mConnectivityDiagnosticsManager.unregisterConnectivityDiagnosticsCallback(
		mDiagnosticsCallback);
		clearVpnNetworkPreference(mSessionKey);

		mExecutor.shutdown();
		@@ -5216,7 +5197,7 @@ public class Vpn {
		pw.println("MOBIKE " + (runner.mMobikeEnabled ? "enabled" : "disabled"));
		pw.println("Profile: " + runner.mProfile);
		pw.println("Token: " + runner.mCurrentToken);
		if (mDataStallSuspected) pw.println("Data stall suspected");
		pw.println("Validation failed retry count:" + runner.mValidationFailRetryCount);
		if (runner.mScheduledHandleDataStallFuture != null) {
		pw.println("Reset session scheduled");
		}