diff --git a/framework/api/module-lib-current.txt b/framework/api/module-lib-current.txt
index a55ed6f..4b33366 100644
--- a/framework/api/module-lib-current.txt
+++ b/framework/api/module-lib-current.txt
@@ -9,7 +9,7 @@
     method @NonNull @RequiresPermission(anyOf={android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK, android.Manifest.permission.NETWORK_STACK, android.Manifest.permission.NETWORK_SETTINGS}) public java.util.List<android.net.NetworkStateSnapshot> getAllNetworkStateSnapshot();
     method @NonNull public static android.util.Range<java.lang.Integer> getIpSecNetIdRange();
     method @RequiresPermission(anyOf={android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK, android.Manifest.permission.NETWORK_SETTINGS}) public void registerSystemDefaultNetworkCallback(@NonNull android.net.ConnectivityManager.NetworkCallback, @NonNull android.os.Handler);
-    method @RequiresPermission(anyOf={android.Manifest.permission.NETWORK_SETTINGS, android.Manifest.permission.NETWORK_STACK, android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK}) public void requestBackgroundNetwork(@NonNull android.net.NetworkRequest, @Nullable android.os.Handler, @NonNull android.net.ConnectivityManager.NetworkCallback);
+    method @RequiresPermission(anyOf={android.Manifest.permission.NETWORK_SETTINGS, android.Manifest.permission.NETWORK_STACK, android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK}) public void requestBackgroundNetwork(@NonNull android.net.NetworkRequest, @NonNull android.os.Handler, @NonNull android.net.ConnectivityManager.NetworkCallback);
     method @RequiresPermission(anyOf={android.Manifest.permission.MANAGE_TEST_NETWORKS, android.Manifest.permission.NETWORK_STACK}) public void simulateDataStall(int, long, @NonNull android.net.Network, @NonNull android.os.PersistableBundle);
   }
 
@@ -52,6 +52,14 @@
     field public static final String TEST_TAP_PREFIX = "testtap";
   }
 
+  public final class TestNetworkSpecifier extends android.net.NetworkSpecifier implements android.os.Parcelable {
+    ctor public TestNetworkSpecifier(@NonNull String);
+    method public int describeContents();
+    method @Nullable public String getInterfaceName();
+    method public void writeToParcel(@NonNull android.os.Parcel, int);
+    field @NonNull public static final android.os.Parcelable.Creator<android.net.TestNetworkSpecifier> CREATOR;
+  }
+
   public final class VpnTransportInfo implements android.os.Parcelable android.net.TransportInfo {
     ctor public VpnTransportInfo(int);
     method public int describeContents();
diff --git a/framework/src/android/net/ConnectivityManager.java b/framework/src/android/net/ConnectivityManager.java
index a2fcdd6..72928da 100644
--- a/framework/src/android/net/ConnectivityManager.java
+++ b/framework/src/android/net/ConnectivityManager.java
@@ -20,6 +20,7 @@
 import static android.net.NetworkRequest.Type.BACKGROUND_REQUEST;
 import static android.net.NetworkRequest.Type.LISTEN;
 import static android.net.NetworkRequest.Type.REQUEST;
+import static android.net.NetworkRequest.Type.TRACK_BEST;
 import static android.net.NetworkRequest.Type.TRACK_DEFAULT;
 import static android.net.NetworkRequest.Type.TRACK_SYSTEM_DEFAULT;
 import static android.net.QosCallback.QosCallbackRegistrationException;
@@ -4190,6 +4191,18 @@
     }
 
     /**
+     * @hide
+     */
+    // TODO: Make it public api.
+    @SuppressLint("ExecutorRegistration")
+    public void registerBestMatchingNetworkCallback(@NonNull NetworkRequest request,
+            @NonNull NetworkCallback networkCallback, @NonNull Handler handler) {
+        final NetworkCapabilities nc = request.networkCapabilities;
+        final CallbackHandler cbHandler = new CallbackHandler(handler);
+        sendRequestForNetwork(nc, networkCallback, 0, TRACK_BEST, TYPE_NONE, cbHandler);
+    }
+
+    /**
      * Requests bandwidth update for a given {@link Network} and returns whether the update request
      * is accepted by ConnectivityService. Once accepted, ConnectivityService will poll underlying
      * network connection for updated bandwidth information. The caller will be notified via
@@ -4979,10 +4992,10 @@
             NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK
     })
     public void requestBackgroundNetwork(@NonNull NetworkRequest request,
-            @Nullable Handler handler, @NonNull NetworkCallback networkCallback) {
+            @NonNull Handler handler, @NonNull NetworkCallback networkCallback) {
         final NetworkCapabilities nc = request.networkCapabilities;
         sendRequestForNetwork(nc, networkCallback, 0, BACKGROUND_REQUEST,
-                TYPE_NONE, handler == null ? getDefaultHandler() : new CallbackHandler(handler));
+                TYPE_NONE, new CallbackHandler(handler));
     }
 
     /**
diff --git a/framework/src/android/net/NetworkRequest.java b/framework/src/android/net/NetworkRequest.java
index b4a651c..aa69756 100644
--- a/framework/src/android/net/NetworkRequest.java
+++ b/framework/src/android/net/NetworkRequest.java
@@ -31,6 +31,7 @@
 import static android.net.NetworkCapabilities.NET_CAPABILITY_TEMPORARILY_NOT_METERED;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_TRUSTED;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_VALIDATED;
+import static android.net.NetworkCapabilities.TRANSPORT_TEST;
 
 import android.annotation.NonNull;
 import android.annotation.Nullable;
@@ -113,6 +114,10 @@
      *       for the network (if any) that satisfies the default Internet
      *       request.
      *
+     *     - TRACK_BEST, which causes the framework to send callbacks about
+     *       the single, highest scoring current network (if any) that matches
+     *       the specified NetworkCapabilities.
+     *
      *     - BACKGROUND_REQUEST, like REQUEST but does not cause any networks
      *       to retain the NET_CAPABILITY_FOREGROUND capability. A network with
      *       no foreground requests is in the background. A network that has
@@ -135,6 +140,7 @@
         REQUEST,
         BACKGROUND_REQUEST,
         TRACK_SYSTEM_DEFAULT,
+        TRACK_BEST,
     };
 
     /**
@@ -382,11 +388,17 @@
                 return setNetworkSpecifier(new TelephonyNetworkSpecifier.Builder()
                         .setSubscriptionId(subId).build());
             } catch (NumberFormatException nfe) {
-                // A StringNetworkSpecifier does not accept null or empty ("") strings. When network
-                // specifiers were strings a null string and an empty string were considered
-                // equivalent. Hence no meaning is attached to a null or empty ("") string.
-                return setNetworkSpecifier(TextUtils.isEmpty(networkSpecifier) ? null
-                        : new StringNetworkSpecifier(networkSpecifier));
+                // An EthernetNetworkSpecifier or TestNetworkSpecifier does not accept null or empty
+                // ("") strings. When network specifiers were strings a null string and an empty
+                // string were considered equivalent. Hence no meaning is attached to a null or
+                // empty ("") string.
+                if (TextUtils.isEmpty(networkSpecifier)) {
+                    return setNetworkSpecifier((NetworkSpecifier) null);
+                } else if (mNetworkCapabilities.hasTransport(TRANSPORT_TEST)) {
+                    return setNetworkSpecifier(new TestNetworkSpecifier(networkSpecifier));
+                } else {
+                    return setNetworkSpecifier(new EthernetNetworkSpecifier(networkSpecifier));
+                }
             }
         }
 
diff --git a/framework/src/android/net/TestNetworkSpecifier.java b/framework/src/android/net/TestNetworkSpecifier.java
new file mode 100644
index 0000000..b7470a5
--- /dev/null
+++ b/framework/src/android/net/TestNetworkSpecifier.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.annotation.SystemApi;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.text.TextUtils;
+
+import com.android.internal.util.Preconditions;
+
+import java.util.Objects;
+
+/**
+ * A {@link NetworkSpecifier} used to identify test interfaces.
+ *
+ * @see TestNetworkManager
+ * @hide
+ */
+@SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
+public final class TestNetworkSpecifier extends NetworkSpecifier implements Parcelable {
+
+    /**
+     * Name of the network interface.
+     */
+    @NonNull
+    private final String mInterfaceName;
+
+    public TestNetworkSpecifier(@NonNull String interfaceName) {
+        Preconditions.checkStringNotEmpty(interfaceName);
+        mInterfaceName = interfaceName;
+    }
+
+    // This may be null in the future to support specifiers based on data other than the interface
+    // name.
+    @Nullable
+    public String getInterfaceName() {
+        return mInterfaceName;
+    }
+
+    @Override
+    public boolean canBeSatisfiedBy(@Nullable NetworkSpecifier other) {
+        return equals(other);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (!(o instanceof TestNetworkSpecifier)) return false;
+        return TextUtils.equals(mInterfaceName, ((TestNetworkSpecifier) o).mInterfaceName);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(mInterfaceName);
+    }
+
+    @Override
+    public String toString() {
+        return "TestNetworkSpecifier (" + mInterfaceName + ")";
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(@NonNull Parcel dest, int flags) {
+        dest.writeString(mInterfaceName);
+    }
+
+    public static final @NonNull Creator<TestNetworkSpecifier> CREATOR =
+            new Creator<TestNetworkSpecifier>() {
+        public TestNetworkSpecifier createFromParcel(Parcel in) {
+            return new TestNetworkSpecifier(in.readString());
+        }
+        public TestNetworkSpecifier[] newArray(int size) {
+            return new TestNetworkSpecifier[size];
+        }
+    };
+}
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index ce3a38c..c363478 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -175,6 +175,7 @@
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.provider.Settings;
+import android.sysprop.NetworkProperties;
 import android.telephony.TelephonyManager;
 import android.text.TextUtils;
 import android.util.ArrayMap;
@@ -189,8 +190,6 @@
 import com.android.internal.R;
 import com.android.internal.annotations.GuardedBy;
 import com.android.internal.annotations.VisibleForTesting;
-import com.android.internal.app.IBatteryStats;
-import com.android.internal.util.AsyncChannel;
 import com.android.internal.util.IndentingPrintWriter;
 import com.android.internal.util.LocationPermissionChecker;
 import com.android.internal.util.MessageUtils;
@@ -201,7 +200,6 @@
 import com.android.net.module.util.LinkPropertiesUtils.CompareResult;
 import com.android.net.module.util.NetworkCapabilitiesUtils;
 import com.android.net.module.util.PermissionUtils;
-import com.android.server.am.BatteryStatsService;
 import com.android.server.connectivity.AutodestructReference;
 import com.android.server.connectivity.DnsManager;
 import com.android.server.connectivity.DnsManager.PrivateDnsValidationUpdate;
@@ -217,7 +215,6 @@
 import com.android.server.connectivity.ProxyTracker;
 import com.android.server.connectivity.QosCallbackTracker;
 import com.android.server.net.NetworkPolicyManagerInternal;
-import com.android.server.utils.PriorityDump;
 
 import libcore.io.IoUtils;
 
@@ -346,8 +343,7 @@
     private String mCurrentTcpBufferSizes;
 
     private static final SparseArray<String> sMagicDecoderRing = MessageUtils.findMessageNames(
-            new Class[] { AsyncChannel.class, ConnectivityService.class, NetworkAgent.class,
-                    NetworkAgentInfo.class });
+            new Class[] { ConnectivityService.class, NetworkAgent.class, NetworkAgentInfo.class });
 
     private enum ReapUnvalidatedNetworks {
         // Tear down networks that have no chance (e.g. even if validated) of becoming
@@ -884,27 +880,59 @@
     }
     private final LegacyTypeTracker mLegacyTypeTracker = new LegacyTypeTracker(this);
 
+    final LocalPriorityDump mPriorityDumper = new LocalPriorityDump();
     /**
      * Helper class which parses out priority arguments and dumps sections according to their
      * priority. If priority arguments are omitted, function calls the legacy dump command.
      */
-    private final PriorityDump.PriorityDumper mPriorityDumper = new PriorityDump.PriorityDumper() {
-        @Override
-        public void dumpHigh(FileDescriptor fd, PrintWriter pw, String[] args, boolean asProto) {
-            doDump(fd, pw, new String[] {DIAG_ARG}, asProto);
-            doDump(fd, pw, new String[] {SHORT_ARG}, asProto);
+    private class LocalPriorityDump {
+        private static final String PRIORITY_ARG = "--dump-priority";
+        private static final String PRIORITY_ARG_HIGH = "HIGH";
+        private static final String PRIORITY_ARG_NORMAL = "NORMAL";
+
+        LocalPriorityDump() {}
+
+        private void dumpHigh(FileDescriptor fd, PrintWriter pw) {
+            doDump(fd, pw, new String[] {DIAG_ARG});
+            doDump(fd, pw, new String[] {SHORT_ARG});
         }
 
-        @Override
-        public void dumpNormal(FileDescriptor fd, PrintWriter pw, String[] args, boolean asProto) {
-            doDump(fd, pw, args, asProto);
+        private void dumpNormal(FileDescriptor fd, PrintWriter pw, String[] args) {
+            doDump(fd, pw, args);
         }
 
-        @Override
-        public void dump(FileDescriptor fd, PrintWriter pw, String[] args, boolean asProto) {
-           doDump(fd, pw, args, asProto);
+        public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+            if (args == null) {
+                dumpNormal(fd, pw, args);
+                return;
+            }
+
+            String priority = null;
+            for (int argIndex = 0; argIndex < args.length; argIndex++) {
+                if (args[argIndex].equals(PRIORITY_ARG) && argIndex + 1 < args.length) {
+                    argIndex++;
+                    priority = args[argIndex];
+                }
+            }
+
+            if (PRIORITY_ARG_HIGH.equals(priority)) {
+                dumpHigh(fd, pw);
+            } else if (PRIORITY_ARG_NORMAL.equals(priority)) {
+                dumpNormal(fd, pw, args);
+            } else {
+                // ConnectivityService publishes binder service using publishBinderService() with
+                // no priority assigned will be treated as NORMAL priority. Dumpsys does not send
+                // "--dump-priority" arguments to the service. Thus, dump both NORMAL and HIGH to
+                // align the legacy design.
+                // TODO: Integrate into signal dump.
+                dumpNormal(fd, pw, args);
+                pw.println();
+                pw.println("DUMP OF SERVICE HIGH connectivity");
+                pw.println();
+                dumpHigh(fd, pw);
+            }
         }
-    };
+    }
 
     /**
      * Keeps track of the number of requests made under different uids.
@@ -1035,19 +1063,19 @@
             return new MultinetworkPolicyTracker(c, h, r);
         }
 
-        public IBatteryStats getBatteryStatsService() {
-            return BatteryStatsService.getService();
-        }
-
         /**
          * @see BatteryStatsManager
          */
         public void reportNetworkInterfaceForTransports(Context context, String iface,
                 int[] transportTypes) {
-            final BatteryStatsManager  batteryStats =
+            final BatteryStatsManager batteryStats =
                     context.getSystemService(BatteryStatsManager.class);
             batteryStats.reportNetworkInterfaceForTransports(iface, transportTypes);
         }
+
+        public boolean getCellular464XlatEnabled() {
+            return NetworkProperties.isCellular464XlatEnabled().orElse(true);
+        }
     }
 
     public ConnectivityService(Context context) {
@@ -1246,8 +1274,7 @@
                 new NetworkInfo(TYPE_NONE, 0, "", ""),
                 new LinkProperties(), new NetworkCapabilities(), 0, mContext,
                 null, new NetworkAgentConfig(), this, null,
-                null, 0, INVALID_UID,
-                mQosCallbackTracker);
+                null, 0, INVALID_UID, mQosCallbackTracker, mDeps);
     }
 
     private static NetworkCapabilities createDefaultNetworkCapabilitiesForUid(int uid) {
@@ -1489,11 +1516,11 @@
         // but only exists if an app asks about them or requests them. Ensure the requesting app
         // gets the type it asks for.
         filtered.setType(type);
-        final DetailedState state = isNetworkWithCapabilitiesBlocked(nc, uid, ignoreBlocked)
-                ? DetailedState.BLOCKED
-                : filtered.getDetailedState();
-        filtered.setDetailedState(getLegacyLockdownState(state),
-                "" /* reason */, null /* extraInfo */);
+        if (isNetworkWithCapabilitiesBlocked(nc, uid, ignoreBlocked)) {
+            filtered.setDetailedState(DetailedState.BLOCKED, null /* reason */,
+                    null /* extraInfo */);
+        }
+        filterForLegacyLockdown(filtered);
         return filtered;
     }
 
@@ -1569,8 +1596,8 @@
         final DetailedState state = isNetworkWithCapabilitiesBlocked(nc, uid, false)
                 ? DetailedState.BLOCKED
                 : DetailedState.DISCONNECTED;
-        info.setDetailedState(getLegacyLockdownState(state),
-                "" /* reason */, null /* extraInfo */);
+        info.setDetailedState(state, null /* reason */, null /* extraInfo */);
+        filterForLegacyLockdown(info);
         return info;
     }
 
@@ -2364,9 +2391,7 @@
         mContext.enforceCallingOrSelfPermission(KeepaliveTracker.PERMISSION, "ConnectivityService");
     }
 
-    // Public because it's used by mLockdownTracker.
-    public void sendConnectedBroadcast(NetworkInfo info) {
-        PermissionUtils.enforceNetworkStackPermission(mContext);
+    private void sendConnectedBroadcast(NetworkInfo info) {
         sendGeneralBroadcast(info, CONNECTIVITY_ACTION);
     }
 
@@ -2603,7 +2628,7 @@
     @Override
     protected void dump(@NonNull FileDescriptor fd, @NonNull PrintWriter writer,
             @Nullable String[] args) {
-        PriorityDump.dump(mPriorityDumper, fd, writer, args);
+        mPriorityDumper.dump(fd, writer, args);
     }
 
     private boolean checkDumpPermission(Context context, String tag, PrintWriter pw) {
@@ -2618,10 +2643,9 @@
         }
     }
 
-    private void doDump(FileDescriptor fd, PrintWriter writer, String[] args, boolean asProto) {
+    private void doDump(FileDescriptor fd, PrintWriter writer, String[] args) {
         final IndentingPrintWriter pw = new IndentingPrintWriter(writer, "  ");
         if (!checkDumpPermission(mContext, TAG, pw)) return;
-        if (asProto) return;
 
         if (CollectionUtils.contains(args, DIAG_ARG)) {
             dumpNetworkDiagnostics(pw);
@@ -2864,22 +2888,6 @@
             super(looper);
         }
 
-        private boolean maybeHandleAsyncChannelMessage(Message msg) {
-            switch (msg.what) {
-                default:
-                    return false;
-                case AsyncChannel.CMD_CHANNEL_HALF_CONNECTED: {
-                    handleAsyncChannelHalfConnect(msg);
-                    break;
-                }
-                case AsyncChannel.CMD_CHANNEL_DISCONNECTED: {
-                    handleAsyncChannelDisconnected(msg);
-                    break;
-                }
-            }
-            return true;
-        }
-
         private void maybeHandleNetworkAgentMessage(Message msg) {
             final Pair<NetworkAgentInfo, Object> arg = (Pair<NetworkAgentInfo, Object>) msg.obj;
             final NetworkAgentInfo nai = arg.first;
@@ -3171,8 +3179,7 @@
 
         @Override
         public void handleMessage(Message msg) {
-            if (!maybeHandleAsyncChannelMessage(msg)
-                    && !maybeHandleNetworkMonitorMessage(msg)
+            if (!maybeHandleNetworkMonitorMessage(msg)
                     && !maybeHandleNetworkAgentInfoMessage(msg)) {
                 maybeHandleNetworkAgentMessage(msg);
             }
@@ -3436,21 +3443,6 @@
         return false;
     }
 
-    private void handleAsyncChannelHalfConnect(Message msg) {
-        ensureRunningOnConnectivityServiceThread();
-        if (mNetworkProviderInfos.containsKey(msg.replyTo)) {
-            if (msg.arg1 == AsyncChannel.STATUS_SUCCESSFUL) {
-                if (VDBG) log("NetworkFactory connected");
-                // Finish setting up the full connection
-                NetworkProviderInfo npi = mNetworkProviderInfos.get(msg.replyTo);
-                sendAllRequestsToProvider(npi);
-            } else {
-                loge("Error connecting NetworkFactory");
-                mNetworkProviderInfos.remove(msg.obj);
-            }
-        }
-    }
-
     private void handleNetworkAgentRegistered(Message msg) {
         final NetworkAgentInfo nai = (NetworkAgentInfo) msg.obj;
         if (!mNetworkAgentInfos.contains(nai)) {
@@ -3481,14 +3473,6 @@
         }
     }
 
-    // This is a no-op if it's called with a message designating a provider that has
-    // already been destroyed, because its reference will not be found in the relevant
-    // maps.
-    private void handleAsyncChannelDisconnected(Message msg) {
-        NetworkProviderInfo npi = mNetworkProviderInfos.remove(msg.replyTo);
-        if (DBG && npi != null) log("unregisterNetworkFactory for " + npi.name);
-    }
-
     // Destroys a network, remove references to it from the internal state managed by
     // ConnectivityService, free its interfaces and clean up.
     // Must be called on the Handler thread.
@@ -3614,11 +3598,10 @@
     // pendingIntent => NetworkRequestInfo map.
     // This method assumes that every non-null PendingIntent maps to exactly 1 NetworkRequestInfo.
     private NetworkRequestInfo findExistingNetworkRequestInfo(PendingIntent pendingIntent) {
-        Intent intent = pendingIntent.getIntent();
         for (Map.Entry<NetworkRequest, NetworkRequestInfo> entry : mNetworkRequests.entrySet()) {
             PendingIntent existingPendingIntent = entry.getValue().mPendingIntent;
             if (existingPendingIntent != null &&
-                    existingPendingIntent.getIntent().filterEquals(intent)) {
+                    existingPendingIntent.intentFilterEquals(pendingIntent)) {
                 return entry.getValue();
             }
         }
@@ -5013,8 +4996,8 @@
         // The legacy lockdown VPN always uses the default network.
         // If the VPN's underlying network is no longer the current default network, it means that
         // the default network has just switched, and the VPN is about to disconnect.
-        // Report that the VPN is not connected, so when the state of NetworkInfo objects
-        // overwritten by getLegacyLockdownState will be set to CONNECTING and not CONNECTED.
+        // Report that the VPN is not connected, so the state of NetworkInfo objects overwritten
+        // by filterForLegacyLockdown will be set to CONNECTING and not CONNECTED.
         final NetworkAgentInfo defaultNetwork = getDefaultNetwork();
         if (defaultNetwork == null || !defaultNetwork.network.equals(underlying[0])) {
             return null;
@@ -5023,6 +5006,9 @@
         return nai;
     };
 
+    // TODO: move all callers to filterForLegacyLockdown and delete this method.
+    // This likely requires making sendLegacyNetworkBroadcast take a NetworkInfo object instead of
+    // just a DetailedState object.
     private DetailedState getLegacyLockdownState(DetailedState origState) {
         if (origState != DetailedState.CONNECTED) {
             return origState;
@@ -5032,6 +5018,23 @@
                 : DetailedState.CONNECTED;
     }
 
+    private void filterForLegacyLockdown(NetworkInfo ni) {
+        if (!mLockdownEnabled || !ni.isConnected()) return;
+        // The legacy lockdown VPN replaces the state of every network in CONNECTED state with the
+        // state of its VPN. This is to ensure that when an underlying network connects, apps will
+        // not see a CONNECTIVITY_ACTION broadcast for a network in state CONNECTED until the VPN
+        // comes up, at which point there is a new CONNECTIVITY_ACTION broadcast for the underlying
+        // network, this time with a state of CONNECTED.
+        //
+        // Now that the legacy lockdown code lives in ConnectivityService, and no longer has access
+        // to the internal state of the Vpn object, always replace the state with CONNECTING. This
+        // is not too far off the truth, since an always-on VPN, when not connected, is always
+        // trying to reconnect.
+        if (getLegacyLockdownNai() == null) {
+            ni.setDetailedState(DetailedState.CONNECTING, "", null);
+        }
+    }
+
     @Override
     public void setProvisioningNotificationVisible(boolean visible, int networkType,
             String action) {
@@ -5110,8 +5113,8 @@
         private final IBinder.DeathRecipient mDeathRecipient;
         public final int providerId;
 
-        NetworkProviderInfo(String name, Messenger messenger, AsyncChannel asyncChannel,
-                int providerId, @NonNull IBinder.DeathRecipient deathRecipient) {
+        NetworkProviderInfo(String name, Messenger messenger, int providerId,
+                @NonNull IBinder.DeathRecipient deathRecipient) {
             this.name = name;
             this.messenger = messenger;
             this.providerId = providerId;
@@ -5502,6 +5505,8 @@
                 //  request if the app changes network state. http://b/29964605
                 enforceMeteredApnPolicy(networkCapabilities);
                 break;
+            case TRACK_BEST:
+                throw new UnsupportedOperationException("Not implemented yet");
             default:
                 throw new IllegalArgumentException("Unsupported request type " + reqType);
         }
@@ -5785,8 +5790,7 @@
     public int registerNetworkProvider(Messenger messenger, String name) {
         enforceNetworkFactoryOrSettingsPermission();
         NetworkProviderInfo npi = new NetworkProviderInfo(name, messenger,
-                null /* asyncChannel */, nextNetworkProviderId(),
-                () -> unregisterNetworkProvider(messenger));
+                nextNetworkProviderId(), () -> unregisterNetworkProvider(messenger));
         mHandler.sendMessage(mHandler.obtainMessage(EVENT_REGISTER_NETWORK_PROVIDER, npi));
         return npi.providerId;
     }
@@ -6107,7 +6111,7 @@
         final NetworkAgentInfo nai = new NetworkAgentInfo(na,
                 new Network(mNetIdManager.reserveNetId()), new NetworkInfo(networkInfo), lp, nc,
                 currentScore, mContext, mTrackerHandler, new NetworkAgentConfig(networkAgentConfig),
-                this, mNetd, mDnsResolver, providerId, uid, mQosCallbackTracker);
+                this, mNetd, mDnsResolver, providerId, uid, mQosCallbackTracker, mDeps);
 
         // Make sure the LinkProperties and NetworkCapabilities reflect what the agent info says.
         processCapabilitiesFromAgent(nai, nc);
@@ -7915,6 +7919,7 @@
         // and is still connected.
         NetworkInfo info = new NetworkInfo(nai.networkInfo);
         info.setType(type);
+        filterForLegacyLockdown(info);
         if (state != DetailedState.DISCONNECTED) {
             info.setDetailedState(state, null, info.getExtraInfo());
             sendConnectedBroadcast(info);
diff --git a/services/core/java/com/android/server/ConnectivityServiceInitializer.java b/services/core/java/com/android/server/ConnectivityServiceInitializer.java
index b992208..2465479 100644
--- a/services/core/java/com/android/server/ConnectivityServiceInitializer.java
+++ b/services/core/java/com/android/server/ConnectivityServiceInitializer.java
@@ -16,9 +16,6 @@
 
 package com.android.server;
 
-import static android.os.IServiceManager.DUMP_FLAG_PRIORITY_HIGH;
-import static android.os.IServiceManager.DUMP_FLAG_PRIORITY_NORMAL;
-
 import android.content.Context;
 import android.util.Log;
 
@@ -42,6 +39,6 @@
     public void onStart() {
         Log.i(TAG, "Registering " + Context.CONNECTIVITY_SERVICE);
         publishBinderService(Context.CONNECTIVITY_SERVICE, mConnectivity,
-                /* allowIsolated= */ false, DUMP_FLAG_PRIORITY_HIGH | DUMP_FLAG_PRIORITY_NORMAL);
+                /* allowIsolated= */ false);
     }
 }
diff --git a/services/core/java/com/android/server/TestNetworkService.java b/services/core/java/com/android/server/TestNetworkService.java
index 55408ea..ee61067 100644
--- a/services/core/java/com/android/server/TestNetworkService.java
+++ b/services/core/java/com/android/server/TestNetworkService.java
@@ -33,8 +33,8 @@
 import android.net.NetworkCapabilities;
 import android.net.NetworkProvider;
 import android.net.RouteInfo;
-import android.net.StringNetworkSpecifier;
 import android.net.TestNetworkInterface;
+import android.net.TestNetworkSpecifier;
 import android.net.util.NetdService;
 import android.os.Binder;
 import android.os.Handler;
@@ -242,7 +242,7 @@
         nc.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_SUSPENDED);
         nc.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED);
         nc.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VCN_MANAGED);
-        nc.setNetworkSpecifier(new StringNetworkSpecifier(iface));
+        nc.setNetworkSpecifier(new TestNetworkSpecifier(iface));
         nc.setAdministratorUids(administratorUids);
         if (!isMetered) {
             nc.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_METERED);
diff --git a/services/core/java/com/android/server/connectivity/Nat464Xlat.java b/services/core/java/com/android/server/connectivity/Nat464Xlat.java
index fa80b25..c66a280 100644
--- a/services/core/java/com/android/server/connectivity/Nat464Xlat.java
+++ b/services/core/java/com/android/server/connectivity/Nat464Xlat.java
@@ -16,6 +16,8 @@
 
 package com.android.server.connectivity;
 
+import static android.net.NetworkCapabilities.TRANSPORT_CELLULAR;
+
 import static com.android.net.module.util.CollectionUtils.contains;
 
 import android.annotation.NonNull;
@@ -35,6 +37,7 @@
 
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.net.module.util.NetworkStackConstants;
+import com.android.server.ConnectivityService;
 
 import java.net.Inet6Address;
 import java.util.Objects;
@@ -94,12 +97,15 @@
     private Inet6Address mIPv6Address;
     private State mState = State.IDLE;
 
+    private boolean mEnableClatOnCellular;
     private boolean mPrefixDiscoveryRunning;
 
-    public Nat464Xlat(NetworkAgentInfo nai, INetd netd, IDnsResolver dnsResolver) {
+    public Nat464Xlat(NetworkAgentInfo nai, INetd netd, IDnsResolver dnsResolver,
+            ConnectivityService.Dependencies deps) {
         mDnsResolver = dnsResolver;
         mNetd = netd;
         mNetwork = nai;
+        mEnableClatOnCellular = deps.getCellular464XlatEnabled();
     }
 
     /**
@@ -111,7 +117,7 @@
      * @return true if the network requires clat, false otherwise.
      */
     @VisibleForTesting
-    protected static boolean requiresClat(NetworkAgentInfo nai) {
+    protected boolean requiresClat(NetworkAgentInfo nai) {
         // TODO: migrate to NetworkCapabilities.TRANSPORT_*.
         final boolean supported = contains(NETWORK_TYPES, nai.networkInfo.getType());
         final boolean connected = contains(NETWORK_STATES, nai.networkInfo.getState());
@@ -126,7 +132,9 @@
         final boolean skip464xlat = (nai.netAgentConfig() != null)
                 && nai.netAgentConfig().skip464xlat;
 
-        return supported && connected && isIpv6OnlyNetwork && !skip464xlat;
+        return supported && connected && isIpv6OnlyNetwork && !skip464xlat
+            && (nai.networkCapabilities.hasTransport(TRANSPORT_CELLULAR)
+                ? isCellular464XlatEnabled() : true);
     }
 
     /**
@@ -137,7 +145,7 @@
      * @return true if the network should start clat, false otherwise.
      */
     @VisibleForTesting
-    protected static boolean shouldStartClat(NetworkAgentInfo nai) {
+    protected boolean shouldStartClat(NetworkAgentInfo nai) {
         LinkProperties lp = nai.linkProperties;
         return requiresClat(nai) && lp != null && lp.getNat64Prefix() != null;
     }
@@ -507,4 +515,9 @@
     protected int getNetId() {
         return mNetwork.network.getNetId();
     }
+
+    @VisibleForTesting
+    protected boolean isCellular464XlatEnabled() {
+        return mEnableClatOnCellular;
+    }
 }
diff --git a/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java b/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java
index 1d0e115..803cc9d 100644
--- a/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java
+++ b/services/core/java/com/android/server/connectivity/NetworkAgentInfo.java
@@ -341,7 +341,7 @@
             @NonNull LinkProperties lp, @NonNull NetworkCapabilities nc, int score, Context context,
             Handler handler, NetworkAgentConfig config, ConnectivityService connService, INetd netd,
             IDnsResolver dnsResolver, int factorySerialNumber, int creatorUid,
-            QosCallbackTracker qosCallbackTracker) {
+            QosCallbackTracker qosCallbackTracker, ConnectivityService.Dependencies deps) {
         Objects.requireNonNull(net);
         Objects.requireNonNull(info);
         Objects.requireNonNull(lp);
@@ -355,7 +355,7 @@
         linkProperties = lp;
         networkCapabilities = nc;
         mScore = score;
-        clatd = new Nat464Xlat(this, netd, dnsResolver);
+        clatd = new Nat464Xlat(this, netd, dnsResolver, deps);
         mConnService = connService;
         mContext = context;
         mHandler = handler;
diff --git a/tests/net/TEST_MAPPING b/tests/net/TEST_MAPPING
index 89fc6ea..d659688 100644
--- a/tests/net/TEST_MAPPING
+++ b/tests/net/TEST_MAPPING
@@ -9,6 +9,23 @@
       "name": "FrameworksNetDeflakeTest"
     }
   ],
+  "auto-postsubmit": [
+    // Test tag for automotive targets. These are only running in postsubmit so as to harden the
+    // automotive targets to avoid introducing additional test flake and build time. The plan for
+    // presubmit testing for auto is to augment the existing tests to cover auto use cases as well.
+    // Additionally, this tag is used in targeted test suites to limit resource usage on the test
+    // infra during the hardening phase.
+    // TODO: this tag to be removed once the above is no longer an issue.
+    {
+      "name": "FrameworksNetTests"
+    },
+    {
+      "name": "FrameworksNetIntegrationTests"
+    },
+    {
+      "name": "FrameworksNetDeflakeTest"
+    }
+  ],
   "imports": [
     {
       "path": "cts/tests/tests/net"
diff --git a/tests/net/common/java/android/net/NetworkCapabilitiesTest.java b/tests/net/common/java/android/net/NetworkCapabilitiesTest.java
index 5d0e016..e84b992 100644
--- a/tests/net/common/java/android/net/NetworkCapabilitiesTest.java
+++ b/tests/net/common/java/android/net/NetworkCapabilitiesTest.java
@@ -68,6 +68,7 @@
 import androidx.test.runner.AndroidJUnit4;
 
 import com.android.modules.utils.build.SdkLevel;
+import com.android.testutils.CompatUtil;
 import com.android.testutils.DevSdkIgnoreRule;
 import com.android.testutils.DevSdkIgnoreRule.IgnoreUpTo;
 
@@ -211,7 +212,7 @@
         nc1 = new NetworkCapabilities().addTransportType(TRANSPORT_WIFI);
         nc2 = new NetworkCapabilities()
                 .addTransportType(TRANSPORT_WIFI)
-                .setNetworkSpecifier(new StringNetworkSpecifier("specs"));
+                .setNetworkSpecifier(CompatUtil.makeEthernetNetworkSpecifier("eth42"));
         assertNotEquals("", nc1.describeImmutableDifferences(nc2));
         assertEquals("", nc1.describeImmutableDifferences(nc1));
     }
@@ -671,7 +672,7 @@
         NetworkCapabilities nc1 = new NetworkCapabilities();
         nc1.addTransportType(TRANSPORT_CELLULAR).addTransportType(TRANSPORT_WIFI);
         try {
-            nc1.setNetworkSpecifier(new StringNetworkSpecifier("specs"));
+            nc1.setNetworkSpecifier(CompatUtil.makeEthernetNetworkSpecifier("eth0"));
             fail("Cannot set NetworkSpecifier on a NetworkCapability with multiple transports!");
         } catch (IllegalStateException expected) {
             // empty
@@ -680,7 +681,7 @@
         // Sequence 2: Transport + NetworkSpecifier + Transport
         NetworkCapabilities nc2 = new NetworkCapabilities();
         nc2.addTransportType(TRANSPORT_CELLULAR).setNetworkSpecifier(
-                new StringNetworkSpecifier("specs"));
+                CompatUtil.makeEthernetNetworkSpecifier("testtap3"));
         try {
             nc2.addTransportType(TRANSPORT_WIFI);
             fail("Cannot set a second TransportType of a network which has a NetworkSpecifier!");
diff --git a/tests/net/common/java/android/net/NetworkProviderTest.kt b/tests/net/common/java/android/net/NetworkProviderTest.kt
index bcc9072..340e6f9 100644
--- a/tests/net/common/java/android/net/NetworkProviderTest.kt
+++ b/tests/net/common/java/android/net/NetworkProviderTest.kt
@@ -27,6 +27,7 @@
 import android.os.Looper
 import androidx.test.InstrumentationRegistry
 import com.android.net.module.util.ArrayTrackRecord
+import com.android.testutils.CompatUtil
 import com.android.testutils.DevSdkIgnoreRule.IgnoreUpTo
 import com.android.testutils.DevSdkIgnoreRunner
 import com.android.testutils.isDevSdkInRange
@@ -102,7 +103,8 @@
         mCm.registerNetworkProvider(provider)
         assertNotEquals(provider.getProviderId(), NetworkProvider.ID_NONE)
 
-        val specifier = StringNetworkSpecifier(UUID.randomUUID().toString())
+        val specifier = CompatUtil.makeTestNetworkSpecifier(
+                UUID.randomUUID().toString())
         val nr: NetworkRequest = NetworkRequest.Builder()
                 .addTransportType(TRANSPORT_TEST)
                 .setNetworkSpecifier(specifier)
@@ -183,7 +185,8 @@
 
         mCm.registerNetworkProvider(provider)
 
-        val specifier = StringNetworkSpecifier(UUID.randomUUID().toString())
+        val specifier = CompatUtil.makeTestNetworkSpecifier(
+                UUID.randomUUID().toString())
         val nr: NetworkRequest = NetworkRequest.Builder()
                 .addTransportType(TRANSPORT_TEST)
                 .setNetworkSpecifier(specifier)
diff --git a/tests/net/integration/util/com/android/server/NetworkAgentWrapper.java b/tests/net/integration/util/com/android/server/NetworkAgentWrapper.java
index e1da3d0..01d8186 100644
--- a/tests/net/integration/util/com/android/server/NetworkAgentWrapper.java
+++ b/tests/net/integration/util/com/android/server/NetworkAgentWrapper.java
@@ -64,6 +64,7 @@
     private final HandlerThread mHandlerThread;
     private final Context mContext;
     private final String mLogTag;
+    private final NetworkAgentConfig mNetworkAgentConfig;
 
     private final ConditionVariable mDisconnected = new ConditionVariable();
     private final ConditionVariable mPreventReconnectReceived = new ConditionVariable();
@@ -115,13 +116,19 @@
         mHandlerThread = new HandlerThread(mLogTag);
         mHandlerThread.start();
 
-        mNetworkAgent = makeNetworkAgent(linkProperties, type, typeName);
+        // extraInfo is set to "" by default in NetworkAgentConfig.
+        final String extraInfo = (transport == TRANSPORT_CELLULAR) ? "internet.apn" : "";
+        mNetworkAgentConfig = new NetworkAgentConfig.Builder()
+                .setLegacyType(type)
+                .setLegacyTypeName(typeName)
+                .setLegacyExtraInfo(extraInfo)
+                .build();
+        mNetworkAgent = makeNetworkAgent(linkProperties, mNetworkAgentConfig);
     }
 
     protected InstrumentedNetworkAgent makeNetworkAgent(LinkProperties linkProperties,
-            final int type, final String typeName)
-            throws Exception {
-        return new InstrumentedNetworkAgent(this, linkProperties, type, typeName);
+            final NetworkAgentConfig nac) throws Exception {
+        return new InstrumentedNetworkAgent(this, linkProperties, nac);
     }
 
     public static class InstrumentedNetworkAgent extends NetworkAgent {
@@ -129,11 +136,9 @@
         private static final String PROVIDER_NAME = "InstrumentedNetworkAgentProvider";
 
         public InstrumentedNetworkAgent(NetworkAgentWrapper wrapper, LinkProperties lp,
-                final int type, final String typeName) {
+                NetworkAgentConfig nac) {
             super(wrapper.mContext, wrapper.mHandlerThread.getLooper(), wrapper.mLogTag,
-                    wrapper.mNetworkCapabilities, lp, wrapper.mScore,
-                    new NetworkAgentConfig.Builder()
-                            .setLegacyType(type).setLegacyTypeName(typeName).build(),
+                    wrapper.mNetworkCapabilities, lp, wrapper.mScore, nac,
                     new NetworkProvider(wrapper.mContext, wrapper.mHandlerThread.getLooper(),
                             PROVIDER_NAME));
             mWrapper = wrapper;
@@ -301,6 +306,14 @@
         return mNetworkCapabilities;
     }
 
+    public int getLegacyType() {
+        return mNetworkAgentConfig.getLegacyType();
+    }
+
+    public String getExtraInfo() {
+        return mNetworkAgentConfig.getLegacyExtraInfo();
+    }
+
     public @NonNull ArrayTrackRecord<CallbackType>.ReadHead getCallbackHistory() {
         return mCallbackHistory;
     }
diff --git a/tests/net/java/android/net/ConnectivityManagerTest.java b/tests/net/java/android/net/ConnectivityManagerTest.java
index 6a09b02..098b029 100644
--- a/tests/net/java/android/net/ConnectivityManagerTest.java
+++ b/tests/net/java/android/net/ConnectivityManagerTest.java
@@ -376,13 +376,13 @@
                 eq(testPkgName), eq(testAttributionTag));
         reset(mService);
 
-        manager.requestBackgroundNetwork(request, null, callback);
+        Handler handler = new Handler(ConnectivityThread.getInstanceLooper());
+        manager.requestBackgroundNetwork(request, handler, callback);
         verify(mService).requestNetwork(eq(request.networkCapabilities),
                 eq(BACKGROUND_REQUEST.ordinal()), any(), anyInt(), any(), eq(TYPE_NONE),
                 eq(testPkgName), eq(testAttributionTag));
         reset(mService);
 
-        Handler handler = new Handler(ConnectivityThread.getInstanceLooper());
         manager.registerSystemDefaultNetworkCallback(callback, handler);
         verify(mService).requestNetwork(eq(null),
                 eq(TRACK_SYSTEM_DEFAULT.ordinal()), any(), anyInt(), any(), eq(TYPE_NONE),
diff --git a/tests/net/java/com/android/server/ConnectivityServiceTest.java b/tests/net/java/com/android/server/ConnectivityServiceTest.java
index a643bc8..a6b20fb 100644
--- a/tests/net/java/com/android/server/ConnectivityServiceTest.java
+++ b/tests/net/java/com/android/server/ConnectivityServiceTest.java
@@ -266,7 +266,6 @@
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
-import com.android.internal.app.IBatteryStats;
 import com.android.internal.net.VpnConfig;
 import com.android.internal.net.VpnProfile;
 import com.android.internal.util.ArrayUtils;
@@ -428,7 +427,6 @@
     @Mock DeviceIdleInternal mDeviceIdleInternal;
     @Mock INetworkManagementService mNetworkManagementService;
     @Mock NetworkStatsManager mStatsManager;
-    @Mock IBatteryStats mBatteryStatsService;
     @Mock IDnsResolver mMockDnsResolver;
     @Mock INetd mMockNetd;
     @Mock NetworkStackClient mNetworkStack;
@@ -720,7 +718,7 @@
 
         @Override
         protected InstrumentedNetworkAgent makeNetworkAgent(LinkProperties linkProperties,
-                final int type, final String typeName) throws Exception {
+                NetworkAgentConfig nac) throws Exception {
             mNetworkMonitor = mock(INetworkMonitor.class);
 
             final Answer validateAnswer = inv -> {
@@ -739,8 +737,8 @@
                     any() /* name */,
                     nmCbCaptor.capture());
 
-            final InstrumentedNetworkAgent na = new InstrumentedNetworkAgent(this, linkProperties,
-                    type, typeName) {
+            final InstrumentedNetworkAgent na =
+                    new InstrumentedNetworkAgent(this, linkProperties, nac) {
                 @Override
                 public void networkStatus(int status, String redirectUrl) {
                     mRedirectUrl = redirectUrl;
@@ -1527,12 +1525,12 @@
         doReturn(mSystemProperties).when(deps).getSystemProperties();
         doReturn(mock(ProxyTracker.class)).when(deps).makeProxyTracker(any(), any());
         doReturn(true).when(deps).queryUserAccess(anyInt(), anyInt());
-        doReturn(mBatteryStatsService).when(deps).getBatteryStatsService();
         doAnswer(inv -> {
             mPolicyTracker = new WrappedMultinetworkPolicyTracker(
                     inv.getArgument(0), inv.getArgument(1), inv.getArgument(2));
             return mPolicyTracker;
         }).when(deps).makeMultinetworkPolicyTracker(any(), any(), any());
+        doReturn(true).when(deps).getCellular464XlatEnabled();
 
         return deps;
     }
@@ -1743,11 +1741,29 @@
         return expected;
     }
 
+    private boolean extraInfoInBroadcastHasExpectedNullness(NetworkInfo ni) {
+        final DetailedState state = ni.getDetailedState();
+        if (state == DetailedState.CONNECTED && ni.getExtraInfo() == null) return false;
+        // Expect a null extraInfo if the network is CONNECTING, because a CONNECTIVITY_ACTION
+        // broadcast with a state of CONNECTING only happens due to legacy VPN lockdown, which also
+        // nulls out extraInfo.
+        if (state == DetailedState.CONNECTING && ni.getExtraInfo() != null) return false;
+        // Can't make any assertions about DISCONNECTED broadcasts. When a network actually
+        // disconnects, disconnectAndDestroyNetwork sets its state to DISCONNECTED and its extraInfo
+        // to null. But if the DISCONNECTED broadcast is just simulated by LegacyTypeTracker due to
+        // a network switch, extraInfo will likely be populated.
+        // This is likely a bug in CS, but likely not one we can fix without impacting apps.
+        return true;
+    }
+
     private ExpectedBroadcast expectConnectivityAction(int type, NetworkInfo.DetailedState state) {
-        return registerConnectivityBroadcastThat(1, intent ->
-                type == intent.getIntExtra(EXTRA_NETWORK_TYPE, -1) && state.equals(
-                        ((NetworkInfo) intent.getParcelableExtra(EXTRA_NETWORK_INFO))
-                                .getDetailedState()));
+        return registerConnectivityBroadcastThat(1, intent -> {
+            final int actualType = intent.getIntExtra(EXTRA_NETWORK_TYPE, -1);
+            final NetworkInfo ni = intent.getParcelableExtra(EXTRA_NETWORK_INFO);
+            return type == actualType
+                    && state == ni.getDetailedState()
+                    && extraInfoInBroadcastHasExpectedNullness(ni);
+        });
     }
 
     @Test
@@ -4011,7 +4027,8 @@
         grantUsingBackgroundNetworksPermissionForUid(Binder.getCallingUid());
         final TestNetworkCallback cellBgCallback = new TestNetworkCallback();
         mCm.requestBackgroundNetwork(new NetworkRequest.Builder()
-                .addTransportType(TRANSPORT_CELLULAR).build(), null, cellBgCallback);
+                .addTransportType(TRANSPORT_CELLULAR).build(),
+                mCsHandlerThread.getThreadHandler(), cellBgCallback);
 
         // Make callbacks for monitoring.
         final NetworkRequest request = new NetworkRequest.Builder().build();
@@ -7185,12 +7202,14 @@
         assertEquals(mCellNetworkAgent.getNetwork(), mCm.getActiveNetwork());
         assertActiveNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
         assertNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
+        assertExtraInfoFromCmPresent(mCellNetworkAgent);
 
         setUidRulesChanged(RULE_REJECT_ALL);
         cellNetworkCallback.expectBlockedStatusCallback(true, mCellNetworkAgent);
         assertNull(mCm.getActiveNetwork());
         assertActiveNetworkInfo(TYPE_MOBILE, DetailedState.BLOCKED);
         assertNetworkInfo(TYPE_MOBILE, DetailedState.BLOCKED);
+        assertExtraInfoFromCmBlocked(mCellNetworkAgent);
 
         // ConnectivityService should cache it not to invoke the callback again.
         setUidRulesChanged(RULE_REJECT_METERED);
@@ -7201,12 +7220,14 @@
         assertEquals(mCellNetworkAgent.getNetwork(), mCm.getActiveNetwork());
         assertActiveNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
         assertNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
+        assertExtraInfoFromCmPresent(mCellNetworkAgent);
 
         setUidRulesChanged(RULE_REJECT_METERED);
         cellNetworkCallback.expectBlockedStatusCallback(true, mCellNetworkAgent);
         assertNull(mCm.getActiveNetwork());
         assertActiveNetworkInfo(TYPE_MOBILE, DetailedState.BLOCKED);
         assertNetworkInfo(TYPE_MOBILE, DetailedState.BLOCKED);
+        assertExtraInfoFromCmBlocked(mCellNetworkAgent);
 
         // Restrict the network based on UID rule and NOT_METERED capability change.
         mCellNetworkAgent.addCapability(NET_CAPABILITY_NOT_METERED);
@@ -7215,6 +7236,7 @@
         assertEquals(mCellNetworkAgent.getNetwork(), mCm.getActiveNetwork());
         assertActiveNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
         assertNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
+        assertExtraInfoFromCmPresent(mCellNetworkAgent);
 
         mCellNetworkAgent.removeCapability(NET_CAPABILITY_NOT_METERED);
         cellNetworkCallback.expectCapabilitiesWithout(NET_CAPABILITY_NOT_METERED,
@@ -7223,12 +7245,14 @@
         assertNull(mCm.getActiveNetwork());
         assertActiveNetworkInfo(TYPE_MOBILE, DetailedState.BLOCKED);
         assertNetworkInfo(TYPE_MOBILE, DetailedState.BLOCKED);
+        assertExtraInfoFromCmBlocked(mCellNetworkAgent);
 
         setUidRulesChanged(RULE_ALLOW_METERED);
         cellNetworkCallback.expectBlockedStatusCallback(false, mCellNetworkAgent);
         assertEquals(mCellNetworkAgent.getNetwork(), mCm.getActiveNetwork());
         assertActiveNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
         assertNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
+        assertExtraInfoFromCmPresent(mCellNetworkAgent);
 
         setUidRulesChanged(RULE_NONE);
         cellNetworkCallback.assertNoCallback();
@@ -7239,6 +7263,7 @@
         assertNull(mCm.getActiveNetwork());
         assertActiveNetworkInfo(TYPE_MOBILE, DetailedState.BLOCKED);
         assertNetworkInfo(TYPE_MOBILE, DetailedState.BLOCKED);
+        assertExtraInfoFromCmBlocked(mCellNetworkAgent);
         setRestrictBackgroundChanged(true);
         cellNetworkCallback.assertNoCallback();
 
@@ -7246,12 +7271,14 @@
         cellNetworkCallback.expectBlockedStatusCallback(false, mCellNetworkAgent);
         assertActiveNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
         assertNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
+        assertExtraInfoFromCmPresent(mCellNetworkAgent);
 
         setRestrictBackgroundChanged(false);
         cellNetworkCallback.assertNoCallback();
         assertEquals(mCellNetworkAgent.getNetwork(), mCm.getActiveNetwork());
         assertActiveNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
         assertNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
+        assertExtraInfoFromCmPresent(mCellNetworkAgent);
 
         mCm.unregisterNetworkCallback(cellNetworkCallback);
     }
@@ -7310,6 +7337,15 @@
         assertNotNull(ni);
         assertEquals(type, ni.getType());
         assertEquals(ConnectivityManager.getNetworkTypeName(type), state, ni.getDetailedState());
+        if (state == DetailedState.CONNECTED || state == DetailedState.SUSPENDED) {
+            assertNotNull(ni.getExtraInfo());
+        } else {
+            // Technically speaking, a network that's in CONNECTING state will generally have a
+            // non-null extraInfo. This doesn't actually happen in this test because it never calls
+            // a legacy API while a network is connecting. When a network is in CONNECTING state
+            // because of legacy lockdown VPN, its extraInfo is always null.
+            assertNull(ni.getExtraInfo());
+        }
     }
 
     private void assertActiveNetworkInfo(int type, DetailedState state) {
@@ -7319,6 +7355,26 @@
         checkNetworkInfo(mCm.getNetworkInfo(type), type, state);
     }
 
+    private void assertExtraInfoFromCm(TestNetworkAgentWrapper network, boolean present) {
+        final NetworkInfo niForNetwork = mCm.getNetworkInfo(network.getNetwork());
+        final NetworkInfo niForType = mCm.getNetworkInfo(network.getLegacyType());
+        if (present) {
+            assertEquals(network.getExtraInfo(), niForNetwork.getExtraInfo());
+            assertEquals(network.getExtraInfo(), niForType.getExtraInfo());
+        } else {
+            assertNull(niForNetwork.getExtraInfo());
+            assertNull(niForType.getExtraInfo());
+        }
+    }
+
+    private void assertExtraInfoFromCmBlocked(TestNetworkAgentWrapper network) {
+        assertExtraInfoFromCm(network, false);
+    }
+
+    private void assertExtraInfoFromCmPresent(TestNetworkAgentWrapper network) {
+        assertExtraInfoFromCm(network, true);
+    }
+
     // Checks that each of the |agents| receive a blocked status change callback with the specified
     // |blocked| value, in any order. This is needed because when an event affects multiple
     // networks, ConnectivityService does not guarantee the order in which callbacks are fired.
@@ -7633,6 +7689,7 @@
         assertNetworkInfo(TYPE_MOBILE, DetailedState.BLOCKED);
         assertNetworkInfo(TYPE_WIFI, DetailedState.BLOCKED);
         assertNetworkInfo(TYPE_VPN, DetailedState.BLOCKED);
+        assertExtraInfoFromCmBlocked(mCellNetworkAgent);
 
         // TODO: it would be nice if we could simply rely on the production code here, and have
         // LockdownVpnTracker start the VPN, have the VPN code register its NetworkAgent with
@@ -7661,6 +7718,7 @@
         assertNetworkInfo(TYPE_MOBILE, DetailedState.CONNECTED);
         assertNetworkInfo(TYPE_WIFI, DetailedState.DISCONNECTED);
         assertNetworkInfo(TYPE_VPN, DetailedState.CONNECTED);
+        assertExtraInfoFromCmPresent(mCellNetworkAgent);
         assertTrue(vpnNc.hasTransport(TRANSPORT_VPN));
         assertTrue(vpnNc.hasTransport(TRANSPORT_CELLULAR));
         assertFalse(vpnNc.hasTransport(TRANSPORT_WIFI));
@@ -7703,6 +7761,7 @@
         assertNetworkInfo(TYPE_MOBILE, DetailedState.BLOCKED);
         assertNetworkInfo(TYPE_WIFI, DetailedState.BLOCKED);
         assertNetworkInfo(TYPE_VPN, DetailedState.BLOCKED);
+        assertExtraInfoFromCmBlocked(mWiFiNetworkAgent);
 
         // The VPN comes up again on wifi.
         b1 = expectConnectivityAction(TYPE_VPN, DetailedState.CONNECTED);
@@ -7717,6 +7776,7 @@
         assertNetworkInfo(TYPE_MOBILE, DetailedState.DISCONNECTED);
         assertNetworkInfo(TYPE_WIFI, DetailedState.CONNECTED);
         assertNetworkInfo(TYPE_VPN, DetailedState.CONNECTED);
+        assertExtraInfoFromCmPresent(mWiFiNetworkAgent);
         vpnNc = mCm.getNetworkCapabilities(mMockVpn.getNetwork());
         assertTrue(vpnNc.hasTransport(TRANSPORT_VPN));
         assertTrue(vpnNc.hasTransport(TRANSPORT_WIFI));
@@ -7733,6 +7793,7 @@
         assertNetworkInfo(TYPE_MOBILE, DetailedState.DISCONNECTED);
         assertNetworkInfo(TYPE_WIFI, DetailedState.CONNECTED);
         assertNetworkInfo(TYPE_VPN, DetailedState.CONNECTED);
+        assertExtraInfoFromCmPresent(mWiFiNetworkAgent);
 
         b1 = expectConnectivityAction(TYPE_WIFI, DetailedState.DISCONNECTED);
         mWiFiNetworkAgent.disconnect();
@@ -7812,7 +7873,6 @@
         verify(mDeps).reportNetworkInterfaceForTransports(mServiceContext,
                 cellLp.getInterfaceName(),
                 new int[] { TRANSPORT_CELLULAR });
-        reset(mBatteryStatsService);
 
         final LinkProperties wifiLp = new LinkProperties();
         wifiLp.setInterfaceName("wifi0");
@@ -7822,7 +7882,6 @@
         verify(mDeps).reportNetworkInterfaceForTransports(mServiceContext,
                 wifiLp.getInterfaceName(),
                 new int[] { TRANSPORT_WIFI });
-        reset(mBatteryStatsService);
 
         mCellNetworkAgent.disconnect();
         mWiFiNetworkAgent.disconnect();
@@ -7905,7 +7964,6 @@
         mCellNetworkAgent = new TestNetworkAgentWrapper(TRANSPORT_CELLULAR, cellLp);
         reset(mMockDnsResolver);
         reset(mMockNetd);
-        reset(mBatteryStatsService);
 
         // Connect with ipv6 link properties. Expect prefix discovery to be started.
         mCellNetworkAgent.connect(true);
@@ -8268,6 +8326,45 @@
     }
 
     @Test
+    public void testWith464XlatDisable() throws Exception {
+        doReturn(false).when(mDeps).getCellular464XlatEnabled();
+
+        final TestNetworkCallback callback = new TestNetworkCallback();
+        final TestNetworkCallback defaultCallback = new TestNetworkCallback();
+        final NetworkRequest networkRequest = new NetworkRequest.Builder()
+                .addCapability(NET_CAPABILITY_INTERNET)
+                .build();
+        mCm.registerNetworkCallback(networkRequest, callback);
+        mCm.registerDefaultNetworkCallback(defaultCallback);
+
+        // Bring up validated cell.
+        final LinkProperties cellLp = new LinkProperties();
+        cellLp.setInterfaceName(MOBILE_IFNAME);
+        cellLp.addLinkAddress(new LinkAddress("2001:db8:1::1/64"));
+        cellLp.addRoute(new RouteInfo(new IpPrefix("::/0"), null, MOBILE_IFNAME));
+        mCellNetworkAgent = new TestNetworkAgentWrapper(TRANSPORT_CELLULAR);
+
+        mCellNetworkAgent.sendLinkProperties(cellLp);
+        mCellNetworkAgent.connect(true);
+        callback.expectAvailableThenValidatedCallbacks(mCellNetworkAgent);
+        defaultCallback.expectAvailableThenValidatedCallbacks(mCellNetworkAgent);
+        final int cellNetId = mCellNetworkAgent.getNetwork().netId;
+        waitForIdle();
+
+        verify(mMockDnsResolver, never()).startPrefix64Discovery(cellNetId);
+        Nat464Xlat clat = getNat464Xlat(mCellNetworkAgent);
+        assertTrue("Nat464Xlat was not IDLE", !clat.isStarted());
+
+        // This cannot happen because prefix discovery cannot succeed if it is never started.
+        mService.mResolverUnsolEventCallback.onNat64PrefixEvent(
+                makeNat64PrefixEvent(cellNetId, PREFIX_OPERATION_ADDED, "64:ff9b::", 96));
+
+        // ... but still, check that even if it did, clatd would not be started.
+        verify(mMockNetd, never()).clatdStart(anyString(), anyString());
+        assertTrue("Nat464Xlat was not IDLE", !clat.isStarted());
+    }
+
+    @Test
     public void testDataActivityTracking() throws Exception {
         final TestNetworkCallback networkCallback = new TestNetworkCallback();
         final NetworkRequest networkRequest = new NetworkRequest.Builder()
@@ -8973,7 +9070,7 @@
                 TelephonyManager.getNetworkTypeName(TelephonyManager.NETWORK_TYPE_LTE));
         return new NetworkAgentInfo(null, new Network(NET_ID), info, new LinkProperties(),
                 nc, 0, mServiceContext, null, new NetworkAgentConfig(), mService, null, null, 0,
-                INVALID_UID, mQosCallbackTracker);
+                INVALID_UID, mQosCallbackTracker, new ConnectivityService.Dependencies());
     }
 
     @Test
@@ -10930,4 +11027,12 @@
         verifyNoNetwork();
         mCm.unregisterNetworkCallback(cellCb);
     }
+
+    @Test
+    public void testRegisterBestMatchingNetworkCallback() throws Exception {
+        final NetworkRequest request = new NetworkRequest.Builder().build();
+        assertThrows(UnsupportedOperationException.class,
+                () -> mCm.registerBestMatchingNetworkCallback(request, new NetworkCallback(),
+                        mCsHandlerThread.getThreadHandler()));
+    }
 }
diff --git a/tests/net/java/com/android/server/connectivity/LingerMonitorTest.java b/tests/net/java/com/android/server/connectivity/LingerMonitorTest.java
index a913673..1c0ba4f 100644
--- a/tests/net/java/com/android/server/connectivity/LingerMonitorTest.java
+++ b/tests/net/java/com/android/server/connectivity/LingerMonitorTest.java
@@ -357,7 +357,7 @@
         NetworkAgentInfo nai = new NetworkAgentInfo(null, new Network(netId), info,
                 new LinkProperties(), caps, 50, mCtx, null, new NetworkAgentConfig() /* config */,
                 mConnService, mNetd, mDnsResolver, NetworkProvider.ID_NONE, Binder.getCallingUid(),
-                mQosCallbackTracker);
+                mQosCallbackTracker, new ConnectivityService.Dependencies());
         nai.everValidated = true;
         return nai;
     }
diff --git a/tests/net/java/com/android/server/connectivity/MultipathPolicyTrackerTest.java b/tests/net/java/com/android/server/connectivity/MultipathPolicyTrackerTest.java
index 950d716..38f6d7f 100644
--- a/tests/net/java/com/android/server/connectivity/MultipathPolicyTrackerTest.java
+++ b/tests/net/java/com/android/server/connectivity/MultipathPolicyTrackerTest.java
@@ -46,12 +46,12 @@
 import android.content.pm.ApplicationInfo;
 import android.content.res.Resources;
 import android.net.ConnectivityManager;
+import android.net.EthernetNetworkSpecifier;
 import android.net.Network;
 import android.net.NetworkCapabilities;
 import android.net.NetworkPolicy;
 import android.net.NetworkPolicyManager;
 import android.net.NetworkTemplate;
-import android.net.StringNetworkSpecifier;
 import android.net.TelephonyNetworkSpecifier;
 import android.os.Handler;
 import android.os.UserHandle;
@@ -240,7 +240,7 @@
         NetworkCapabilities capabilities = new NetworkCapabilities()
                 .addCapability(NET_CAPABILITY_INTERNET)
                 .addTransportType(TRANSPORT_CELLULAR)
-                .setNetworkSpecifier(new StringNetworkSpecifier("234"));
+                .setNetworkSpecifier(new EthernetNetworkSpecifier("eth234"));
         if (!roaming) {
             capabilities.addCapability(NET_CAPABILITY_NOT_ROAMING);
         }
diff --git a/tests/net/java/com/android/server/connectivity/Nat464XlatTest.java b/tests/net/java/com/android/server/connectivity/Nat464XlatTest.java
index 5f56e25..9b2a638 100644
--- a/tests/net/java/com/android/server/connectivity/Nat464XlatTest.java
+++ b/tests/net/java/com/android/server/connectivity/Nat464XlatTest.java
@@ -16,11 +16,15 @@
 
 package com.android.server.connectivity;
 
+import static android.net.NetworkCapabilities.TRANSPORT_CELLULAR;
+
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.anyString;
 import static org.mockito.Mockito.eq;
 import static org.mockito.Mockito.inOrder;
+import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.verifyNoMoreInteractions;
@@ -34,6 +38,7 @@
 import android.net.LinkAddress;
 import android.net.LinkProperties;
 import android.net.NetworkAgentConfig;
+import android.net.NetworkCapabilities;
 import android.net.NetworkInfo;
 import android.os.Handler;
 import android.os.test.TestLooper;
@@ -72,11 +77,15 @@
     Handler mHandler;
     NetworkAgentConfig mAgentConfig = new NetworkAgentConfig();
 
-    Nat464Xlat makeNat464Xlat() {
-        return new Nat464Xlat(mNai, mNetd, mDnsResolver) {
+    Nat464Xlat makeNat464Xlat(boolean isCellular464XlatEnabled) {
+        return new Nat464Xlat(mNai, mNetd, mDnsResolver, new ConnectivityService.Dependencies()) {
             @Override protected int getNetId() {
                 return NETID;
             }
+
+            @Override protected boolean isCellular464XlatEnabled() {
+                return isCellular464XlatEnabled;
+            }
         };
     }
 
@@ -99,6 +108,7 @@
         mNai.linkProperties.setInterfaceName(BASE_IFACE);
         mNai.networkInfo = new NetworkInfo(null);
         mNai.networkInfo.setType(ConnectivityManager.TYPE_WIFI);
+        mNai.networkCapabilities = new NetworkCapabilities();
         markNetworkConnected();
         when(mNai.connService()).thenReturn(mConnectivity);
         when(mNai.netAgentConfig()).thenReturn(mAgentConfig);
@@ -110,21 +120,23 @@
     }
 
     private void assertRequiresClat(boolean expected, NetworkAgentInfo nai) {
+        Nat464Xlat nat = makeNat464Xlat(true);
         String msg = String.format("requiresClat expected %b for type=%d state=%s skip=%b "
                 + "nat64Prefix=%s addresses=%s", expected, nai.networkInfo.getType(),
                 nai.networkInfo.getDetailedState(),
                 mAgentConfig.skip464xlat, nai.linkProperties.getNat64Prefix(),
                 nai.linkProperties.getLinkAddresses());
-        assertEquals(msg, expected, Nat464Xlat.requiresClat(nai));
+        assertEquals(msg, expected, nat.requiresClat(nai));
     }
 
     private void assertShouldStartClat(boolean expected, NetworkAgentInfo nai) {
+        Nat464Xlat nat = makeNat464Xlat(true);
         String msg = String.format("shouldStartClat expected %b for type=%d state=%s skip=%b "
                 + "nat64Prefix=%s addresses=%s", expected, nai.networkInfo.getType(),
                 nai.networkInfo.getDetailedState(),
                 mAgentConfig.skip464xlat, nai.linkProperties.getNat64Prefix(),
                 nai.linkProperties.getLinkAddresses());
-        assertEquals(msg, expected, Nat464Xlat.shouldStartClat(nai));
+        assertEquals(msg, expected, nat.shouldStartClat(nai));
     }
 
     @Test
@@ -194,7 +206,7 @@
     }
 
     private void checkNormalStartAndStop(boolean dueToDisconnect) throws Exception {
-        Nat464Xlat nat = makeNat464Xlat();
+        Nat464Xlat nat = makeNat464Xlat(true);
         ArgumentCaptor<LinkProperties> c = ArgumentCaptor.forClass(LinkProperties.class);
 
         mNai.linkProperties.addLinkAddress(V6ADDR);
@@ -245,7 +257,7 @@
     }
 
     private void checkStartStopStart(boolean interfaceRemovedFirst) throws Exception {
-        Nat464Xlat nat = makeNat464Xlat();
+        Nat464Xlat nat = makeNat464Xlat(true);
         ArgumentCaptor<LinkProperties> c = ArgumentCaptor.forClass(LinkProperties.class);
         InOrder inOrder = inOrder(mNetd, mConnectivity);
 
@@ -335,7 +347,7 @@
 
     @Test
     public void testClatdCrashWhileRunning() throws Exception {
-        Nat464Xlat nat = makeNat464Xlat();
+        Nat464Xlat nat = makeNat464Xlat(true);
         ArgumentCaptor<LinkProperties> c = ArgumentCaptor.forClass(LinkProperties.class);
 
         nat.setNat64PrefixFromDns(new IpPrefix(NAT64_PREFIX));
@@ -372,7 +384,7 @@
     }
 
     private void checkStopBeforeClatdStarts(boolean dueToDisconnect) throws Exception {
-        Nat464Xlat nat = makeNat464Xlat();
+        Nat464Xlat nat = makeNat464Xlat(true);
 
         mNai.linkProperties.addLinkAddress(new LinkAddress("2001:db8::1/64"));
 
@@ -414,7 +426,7 @@
     }
 
     private void checkStopAndClatdNeverStarts(boolean dueToDisconnect) throws Exception {
-        Nat464Xlat nat = makeNat464Xlat();
+        Nat464Xlat nat = makeNat464Xlat(true);
 
         mNai.linkProperties.addLinkAddress(new LinkAddress("2001:db8::1/64"));
 
@@ -450,7 +462,7 @@
         final IpPrefix prefixFromDns = new IpPrefix(NAT64_PREFIX);
         final IpPrefix prefixFromRa = new IpPrefix(OTHER_NAT64_PREFIX);
 
-        Nat464Xlat nat = makeNat464Xlat();
+        Nat464Xlat nat = makeNat464Xlat(true);
 
         final LinkProperties emptyLp = new LinkProperties();
         LinkProperties fixedupLp;
@@ -486,10 +498,57 @@
         assertEquals(null, fixedupLp.getNat64Prefix());
     }
 
+    private void checkClatDisabledOnCellular(boolean onCellular) throws Exception {
+        // Disable 464xlat on cellular networks.
+        Nat464Xlat nat = makeNat464Xlat(false);
+        mNai.linkProperties.addLinkAddress(V6ADDR);
+        mNai.networkCapabilities.setTransportType(TRANSPORT_CELLULAR, onCellular);
+        nat.update();
+
+        final IpPrefix nat64Prefix = new IpPrefix(NAT64_PREFIX);
+        if (onCellular) {
+            // Prefix discovery is never started.
+            verify(mDnsResolver, never()).startPrefix64Discovery(eq(NETID));
+            assertIdle(nat);
+
+            // If a NAT64 prefix comes in from an RA, clat is not started either.
+            mNai.linkProperties.setNat64Prefix(nat64Prefix);
+            nat.setNat64PrefixFromRa(nat64Prefix);
+            nat.update();
+            verify(mNetd, never()).clatdStart(anyString(), anyString());
+            assertIdle(nat);
+        } else {
+            // Prefix discovery is started.
+            verify(mDnsResolver).startPrefix64Discovery(eq(NETID));
+            assertIdle(nat);
+
+            // If a NAT64 prefix comes in from an RA, clat is started.
+            mNai.linkProperties.setNat64Prefix(nat64Prefix);
+            nat.setNat64PrefixFromRa(nat64Prefix);
+            nat.update();
+            verify(mNetd).clatdStart(BASE_IFACE, NAT64_PREFIX);
+            assertStarting(nat);
+        }
+    }
+
+    @Test
+    public void testClatDisabledOnCellular() throws Exception {
+        checkClatDisabledOnCellular(true);
+    }
+
+    @Test
+    public void testClatDisabledOnNonCellular() throws Exception {
+        checkClatDisabledOnCellular(false);
+    }
+
     static void assertIdle(Nat464Xlat nat) {
         assertTrue("Nat464Xlat was not IDLE", !nat.isStarted());
     }
 
+    static void assertStarting(Nat464Xlat nat) {
+        assertTrue("Nat464Xlat was not STARTING", nat.isStarting());
+    }
+
     static void assertRunning(Nat464Xlat nat) {
         assertTrue("Nat464Xlat was not RUNNING", nat.isRunning());
     }