diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index 8fd2995..c28a901 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -354,7 +354,7 @@
      * @hide
      */
     @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static final String ACTION_TETHER_STATE_CHANGED =
             TetheringManager.ACTION_TETHER_STATE_CHANGED;
 
@@ -363,7 +363,7 @@
      * gives a String[] listing all the interfaces configured for
      * tethering and currently available for tethering.
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static final String EXTRA_AVAILABLE_TETHER = TetheringManager.EXTRA_AVAILABLE_TETHER;
 
     /**
@@ -378,7 +378,7 @@
      * gives a String[] listing all the interfaces currently tethered
      * (ie, has DHCPv4 support and packets potentially forwarded/NATed)
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static final String EXTRA_ACTIVE_TETHER = TetheringManager.EXTRA_ACTIVE_TETHER;
 
     /**
@@ -387,7 +387,7 @@
      * failed.  Use {@link #getLastTetherError} to find the error code
      * for any interfaces listed here.
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static final String EXTRA_ERRORED_TETHER = TetheringManager.EXTRA_ERRORED_TETHER;
 
     /**
@@ -850,7 +850,7 @@
      * {@hide}
      */
     @Deprecated
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static String getNetworkTypeName(int type) {
         switch (type) {
           case TYPE_NONE:
@@ -1173,7 +1173,7 @@
      * {@hide}
      */
     @RequiresPermission(android.Manifest.permission.NETWORK_STACK)
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public NetworkInfo getActiveNetworkInfoForUid(int uid) {
         return getActiveNetworkInfoForUid(uid, false);
     }
@@ -1520,7 +1520,7 @@
         return 1;
     }
 
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     private NetworkCapabilities networkCapabilitiesForFeature(int networkType, String feature) {
         if (networkType == TYPE_MOBILE) {
             switch (feature) {
@@ -1606,7 +1606,7 @@
         };
     }
 
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     private static final HashMap<NetworkCapabilities, LegacyRequest> sLegacyRequests =
             new HashMap<>();
 
@@ -1635,7 +1635,7 @@
         Log.d(TAG, "expireRequest with " + ourSeqNum + ", " + sequenceNum);
     }
 
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     private NetworkRequest requestNetworkForFeatureLocked(NetworkCapabilities netCap) {
         int delay = -1;
         int type = legacyTypeForNetworkCapabilities(netCap);
@@ -1665,7 +1665,7 @@
         }
     }
 
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     private boolean removeRequestForFeature(NetworkCapabilities netCap) {
         final LegacyRequest l;
         synchronized (sLegacyRequests) {
@@ -1732,17 +1732,17 @@
 
     /** @hide */
     public static class PacketKeepaliveCallback {
-        @UnsupportedAppUsage
+        @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
         public PacketKeepaliveCallback() {
         }
         /** The requested keepalive was successfully started. */
-        @UnsupportedAppUsage
+        @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
         public void onStarted() {}
         /** The keepalive was successfully stopped. */
-        @UnsupportedAppUsage
+        @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
         public void onStopped() {}
         /** An error occurred. */
-        @UnsupportedAppUsage
+        @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
         public void onError(int error) {}
     }
 
@@ -1806,7 +1806,7 @@
 
         private volatile Integer mSlot;
 
-        @UnsupportedAppUsage
+        @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
         public void stop() {
             try {
                 mExecutor.execute(() -> {
@@ -1875,7 +1875,7 @@
      *
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public PacketKeepalive startNattKeepalive(
             Network network, int intervalSeconds, PacketKeepaliveCallback callback,
             InetAddress srcAddr, int srcPort, InetAddress dstAddr) {
@@ -2110,7 +2110,7 @@
 
     /** {@hide} */
     @Deprecated
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public NetworkQuotaInfo getActiveNetworkQuotaInfo() {
         try {
             return mService.getActiveNetworkQuotaInfo();
@@ -2408,7 +2408,7 @@
      *
      * {@hide}
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     @Deprecated
     public int tether(String iface) {
         return mTetheringManager.tether(iface);
@@ -2849,7 +2849,7 @@
      * {@hide}
      */
     @RequiresPermission(android.Manifest.permission.ACCESS_NETWORK_STATE)
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     @Deprecated
     public int getLastTetherError(String iface) {
         int error = mTetheringManager.getLastTetherError(iface);
@@ -4659,7 +4659,7 @@
      * @deprecated This is strictly for legacy usage to support {@link #startUsingNetworkFeature}.
      */
     @Deprecated
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static boolean setProcessDefaultNetworkForHostResolution(Network network) {
         return NetworkUtils.bindProcessToNetworkForHostResolution(
                 (network == null) ? NETID_UNSET : network.getNetIdForResolv());
@@ -4816,4 +4816,9 @@
             e.rethrowFromSystemServer();
         }
     }
+
+    private void setOemNetworkPreference(@NonNull OemNetworkPreferences preference) {
+        Log.d(TAG, "setOemNetworkPreference called with preference: "
+                + preference.toString());
+    }
 }
diff --git a/core/java/android/net/IConnectivityManager.aidl b/core/java/android/net/IConnectivityManager.aidl
index 059ec28..4173200 100644
--- a/core/java/android/net/IConnectivityManager.aidl
+++ b/core/java/android/net/IConnectivityManager.aidl
@@ -73,7 +73,7 @@
 
     NetworkCapabilities getNetworkCapabilities(in Network network, String callingPackageName);
 
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = 30, trackingBug = 170729553)
     NetworkState[] getAllNetworkState();
 
     NetworkQuotaInfo getActiveNetworkQuotaInfo();
@@ -134,7 +134,7 @@
 
     VpnConfig getVpnConfig(int userId);
 
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = 30, trackingBug = 170729553)
     void startLegacyVpn(in VpnProfile profile);
 
     LegacyVpnInfo getLegacyVpnInfo(int userId);
diff --git a/core/java/android/net/IpConfiguration.java b/core/java/android/net/IpConfiguration.java
index 23d5ff7..0b20564 100644
--- a/core/java/android/net/IpConfiguration.java
+++ b/core/java/android/net/IpConfiguration.java
@@ -21,6 +21,7 @@
 import android.annotation.SuppressLint;
 import android.annotation.SystemApi;
 import android.compat.annotation.UnsupportedAppUsage;
+import android.os.Build;
 import android.os.Parcel;
 import android.os.Parcelable;
 
@@ -98,7 +99,7 @@
     }
 
     /** @hide */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public IpConfiguration(IpAssignment ipAssignment,
                            ProxySettings proxySettings,
                            StaticIpConfiguration staticIpConfiguration,
diff --git a/core/java/android/net/LinkProperties.java b/core/java/android/net/LinkProperties.java
index 616ccbe..aa4b154 100644
--- a/core/java/android/net/LinkProperties.java
+++ b/core/java/android/net/LinkProperties.java
@@ -111,7 +111,7 @@
      *
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static ProvisioningChange compareProvisioning(
             LinkProperties before, LinkProperties after) {
         if (before.isProvisioned() && after.isProvisioned()) {
@@ -849,7 +849,7 @@
      * Returns all the links stacked on top of this link.
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public @NonNull List<LinkProperties> getStackedLinks() {
         if (mStackedLinks.isEmpty()) {
             return Collections.emptyList();
@@ -1448,7 +1448,7 @@
      * @return {@code true} if both are identical, {@code false} otherwise.
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public boolean isIdenticalStackedLinks(@NonNull LinkProperties target) {
         if (!mStackedLinks.keySet().equals(target.mStackedLinks.keySet())) {
             return false;
diff --git a/core/java/android/net/MacAddress.java b/core/java/android/net/MacAddress.java
index 0eb3c1e..178183d 100644
--- a/core/java/android/net/MacAddress.java
+++ b/core/java/android/net/MacAddress.java
@@ -22,6 +22,7 @@
 import android.compat.annotation.UnsupportedAppUsage;
 import android.net.util.MacAddressUtils;
 import android.net.wifi.WifiInfo;
+import android.os.Build;
 import android.os.Parcel;
 import android.os.Parcelable;
 
@@ -58,7 +59,7 @@
      * <p>Not publicly exposed or treated specially since the OUI 00:00:00 is registered.
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static final MacAddress ALL_ZEROS_ADDRESS = new MacAddress(0);
 
     /** @hide */
diff --git a/core/java/android/net/Network.java b/core/java/android/net/Network.java
index 2561938..f98a1f8 100644
--- a/core/java/android/net/Network.java
+++ b/core/java/android/net/Network.java
@@ -19,6 +19,7 @@
 import android.annotation.NonNull;
 import android.annotation.SystemApi;
 import android.compat.annotation.UnsupportedAppUsage;
+import android.os.Build;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.system.ErrnoException;
@@ -109,7 +110,7 @@
     /**
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public Network(int netId) {
         this(netId, false);
     }
diff --git a/core/java/android/net/NetworkCapabilities.java b/core/java/android/net/NetworkCapabilities.java
index 12ddc62..f806b56 100644
--- a/core/java/android/net/NetworkCapabilities.java
+++ b/core/java/android/net/NetworkCapabilities.java
@@ -133,7 +133,7 @@
      * Represents the network's capabilities.  If any are specified they will be satisfied
      * by any Network that matches all of them.
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     private long mNetworkCapabilities;
 
     /**
@@ -1288,7 +1288,7 @@
      *
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public boolean hasSignalStrength() {
         return mSignalStrength > SIGNAL_STRENGTH_UNSPECIFIED;
     }
@@ -1927,7 +1927,7 @@
     /**
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static @NonNull String transportNamesOf(@Nullable @Transport int[] types) {
         StringJoiner joiner = new StringJoiner("|");
         if (types != null) {
diff --git a/core/java/android/net/NetworkRequest.java b/core/java/android/net/NetworkRequest.java
index 473e6c5..dc16d74 100644
--- a/core/java/android/net/NetworkRequest.java
+++ b/core/java/android/net/NetworkRequest.java
@@ -43,7 +43,7 @@
      * The {@link NetworkCapabilities} that define this request.
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public final @NonNull NetworkCapabilities networkCapabilities;
 
     /**
@@ -52,7 +52,7 @@
      * the request.
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public final int requestId;
 
     /**
diff --git a/core/java/android/net/NetworkUtils.java b/core/java/android/net/NetworkUtils.java
index 1e5b6d5..a0faafa 100644
--- a/core/java/android/net/NetworkUtils.java
+++ b/core/java/android/net/NetworkUtils.java
@@ -98,7 +98,7 @@
      * this socket will go directly to the underlying network, so its traffic will not be
      * forwarded through the VPN.
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static boolean protectFromVpn(FileDescriptor fd) {
         return protectFromVpn(fd.getInt$());
     }
@@ -223,7 +223,7 @@
      * @hide
      * @deprecated use {@link Inet4AddressUtils#netmaskToPrefixLength(Inet4Address)}
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     @Deprecated
     public static int netmaskToPrefixLength(Inet4Address netmask) {
         // This is only here because some apps seem to be using it (@UnsupportedAppUsage).
@@ -290,7 +290,7 @@
     /**
      * Returns the implicit netmask of an IPv4 address, as was the custom before 1993.
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static int getImplicitNetmask(Inet4Address address) {
         // Only here because it seems to be used by apps
         return Inet4AddressUtils.getImplicitNetmask(address);
diff --git a/core/java/android/net/OemNetworkPreferences.java b/core/java/android/net/OemNetworkPreferences.java
new file mode 100644
index 0000000..6a8e3f9
--- /dev/null
+++ b/core/java/android/net/OemNetworkPreferences.java
@@ -0,0 +1,193 @@
+/*
+ * Copyright (C) 2020 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.IntDef;
+import android.annotation.NonNull;
+import android.os.Parcelable;
+import android.util.SparseArray;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+
+/** @hide */
+public final class OemNetworkPreferences implements Parcelable {
+    /**
+     * Use default behavior requesting networks. Equivalent to not setting any preference at all.
+     */
+    public static final int OEM_NETWORK_PREFERENCE_DEFAULT = 0;
+
+    /**
+     * If an unmetered network is available, use it.
+     * Otherwise, if a network with the OEM_PAID capability is available, use it.
+     * Otherwise, use the general default network.
+     */
+    public static final int OEM_NETWORK_PREFERENCE_OEM_PAID = 1;
+
+    /**
+     * If an unmetered network is available, use it.
+     * Otherwise, if a network with the OEM_PAID capability is available, use it.
+     * Otherwise, the app doesn't get a network.
+     */
+    public static final int OEM_NETWORK_PREFERENCE_OEM_PAID_NO_FALLBACK = 2;
+
+    /**
+     * Prefer only NET_CAPABILITY_OEM_PAID networks.
+     */
+    public static final int OEM_NETWORK_PREFERENCE_OEM_PAID_ONLY = 3;
+
+    /**
+     * Prefer only NET_CAPABILITY_OEM_PRIVATE networks.
+     */
+    public static final int OEM_NETWORK_PREFERENCE_OEM_PRIVATE_ONLY = 4;
+
+    @NonNull
+    private final SparseArray<List<String>> mNetworkMappings;
+
+    @NonNull
+    public SparseArray<List<String>> getNetworkPreferences() {
+        return mNetworkMappings.clone();
+    }
+
+    private OemNetworkPreferences(@NonNull SparseArray<List<String>> networkMappings) {
+        Objects.requireNonNull(networkMappings);
+        mNetworkMappings = networkMappings.clone();
+    }
+
+    @Override
+    public String toString() {
+        return "OemNetworkPreferences{" + "mNetworkMappings=" + mNetworkMappings + '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        OemNetworkPreferences that = (OemNetworkPreferences) o;
+
+        return mNetworkMappings.size() == that.mNetworkMappings.size()
+                && mNetworkMappings.toString().equals(that.mNetworkMappings.toString());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(mNetworkMappings);
+    }
+
+    /**
+     * Builder used to create {@link OemNetworkPreferences} objects.  Specify the preferred Network
+     * to package name mappings.
+     *
+     * @hide
+     */
+    public static final class Builder {
+        private final SparseArray<List<String>> mNetworkMappings;
+
+        public Builder() {
+            mNetworkMappings = new SparseArray<>();
+        }
+
+        /**
+         * Add a network preference for a list of packages.
+         *
+         * @param preference the desired network preference to use
+         * @param packages   full package names (e.g.: "com.google.apps.contacts") for apps to use
+         *                   the given preference
+         * @return The builder to facilitate chaining.
+         */
+        @NonNull
+        public Builder addNetworkPreference(@OemNetworkPreference final int preference,
+                @NonNull List<String> packages) {
+            Objects.requireNonNull(packages);
+            mNetworkMappings.put(preference,
+                    Collections.unmodifiableList(new ArrayList<>(packages)));
+            return this;
+        }
+
+        /**
+         * Build {@link OemNetworkPreferences} return the current OEM network preferences.
+         */
+        @NonNull
+        public OemNetworkPreferences build() {
+            return new OemNetworkPreferences(mNetworkMappings);
+        }
+    }
+
+    /** @hide */
+    @IntDef(prefix = "OEM_NETWORK_PREFERENCE_", value = {
+            OEM_NETWORK_PREFERENCE_DEFAULT,
+            OEM_NETWORK_PREFERENCE_OEM_PAID,
+            OEM_NETWORK_PREFERENCE_OEM_PAID_NO_FALLBACK,
+            OEM_NETWORK_PREFERENCE_OEM_PAID_ONLY,
+            OEM_NETWORK_PREFERENCE_OEM_PRIVATE_ONLY
+    })
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface OemNetworkPreference {}
+
+    /**
+     * Return the string value for OemNetworkPreference
+     *
+     * @param value int value of OemNetworkPreference
+     * @return string version of OemNetworkPreference
+     */
+    @NonNull
+    public static String oemNetworkPreferenceToString(@OemNetworkPreference int value) {
+        switch (value) {
+            case OEM_NETWORK_PREFERENCE_DEFAULT:
+                return "OEM_NETWORK_PREFERENCE_DEFAULT";
+            case OEM_NETWORK_PREFERENCE_OEM_PAID:
+                return "OEM_NETWORK_PREFERENCE_OEM_PAID";
+            case OEM_NETWORK_PREFERENCE_OEM_PAID_NO_FALLBACK:
+                return "OEM_NETWORK_PREFERENCE_OEM_PAID_NO_FALLBACK";
+            case OEM_NETWORK_PREFERENCE_OEM_PAID_ONLY:
+                return "OEM_NETWORK_PREFERENCE_OEM_PAID_ONLY";
+            case OEM_NETWORK_PREFERENCE_OEM_PRIVATE_ONLY:
+                return "OEM_NETWORK_PREFERENCE_OEM_PRIVATE_ONLY";
+            default:
+                return Integer.toHexString(value);
+        }
+    }
+
+    @Override
+    public void writeToParcel(@NonNull android.os.Parcel dest, int flags) {
+        dest.writeSparseArray(mNetworkMappings);
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @NonNull
+    public static final Parcelable.Creator<OemNetworkPreferences> CREATOR =
+            new Parcelable.Creator<OemNetworkPreferences>() {
+                @Override
+                public OemNetworkPreferences[] newArray(int size) {
+                    return new OemNetworkPreferences[size];
+                }
+
+                @Override
+                public OemNetworkPreferences createFromParcel(@NonNull android.os.Parcel in) {
+                    return new OemNetworkPreferences(
+                            in.readSparseArray(getClass().getClassLoader()));
+                }
+            };
+}
diff --git a/core/java/android/net/RouteInfo.java b/core/java/android/net/RouteInfo.java
index 62aebb0..6166a75 100644
--- a/core/java/android/net/RouteInfo.java
+++ b/core/java/android/net/RouteInfo.java
@@ -232,7 +232,7 @@
      *
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public RouteInfo(@Nullable IpPrefix destination, @Nullable InetAddress gateway,
             @Nullable String iface) {
         this(destination, gateway, iface, RTN_UNICAST);
@@ -501,7 +501,7 @@
      *
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     @Nullable
     public static RouteInfo selectBestRoute(Collection<RouteInfo> routes, InetAddress dest) {
         return NetUtils.selectBestRoute(routes, dest);
diff --git a/core/java/android/net/StaticIpConfiguration.java b/core/java/android/net/StaticIpConfiguration.java
index f56d656..ce54597 100644
--- a/core/java/android/net/StaticIpConfiguration.java
+++ b/core/java/android/net/StaticIpConfiguration.java
@@ -20,6 +20,7 @@
 import android.annotation.Nullable;
 import android.annotation.SystemApi;
 import android.compat.annotation.UnsupportedAppUsage;
+import android.os.Build;
 import android.os.Parcel;
 import android.os.Parcelable;
 
@@ -53,19 +54,19 @@
 @SystemApi
 public final class StaticIpConfiguration implements Parcelable {
     /** @hide */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     @Nullable
     public LinkAddress ipAddress;
     /** @hide */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     @Nullable
     public InetAddress gateway;
     /** @hide */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     @NonNull
     public final ArrayList<InetAddress> dnsServers;
     /** @hide */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     @Nullable
     public String domains;
 
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 93825ca..fba1e79 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -1917,10 +1917,13 @@
         }
         if (DBG) log("Adding legacy route " + bestRoute +
                 " for UID/PID " + uid + "/" + Binder.getCallingPid());
+
+        final String dst = bestRoute.getDestinationLinkAddress().toString();
+        final String nextHop = bestRoute.hasGateway()
+                ? bestRoute.getGateway().getHostAddress() : "";
         try {
-            mNMS.addLegacyRouteForNetId(netId, bestRoute, uid);
-        } catch (Exception e) {
-            // never crash - catch them all
+            mNetd.networkAddLegacyRoute(netId, bestRoute.getInterface(), dst, nextHop , uid);
+        } catch (RemoteException | ServiceSpecificException e) {
             if (DBG) loge("Exception trying to add a route: " + e);
             return false;
         }
@@ -6443,8 +6446,8 @@
                 && !nai.networkAgentConfig.allowBypass
                 && nc.getOwnerUid() != Process.SYSTEM_UID
                 && lp.getInterfaceName() != null
-                && (lp.hasIPv4DefaultRoute() || lp.hasIpv4UnreachableDefaultRoute())
-                && (lp.hasIPv6DefaultRoute() || lp.hasIpv6UnreachableDefaultRoute());
+                && (lp.hasIpv4DefaultRoute() || lp.hasIpv4UnreachableDefaultRoute())
+                && (lp.hasIpv6DefaultRoute() || lp.hasIpv6UnreachableDefaultRoute());
     }
 
     private void updateUids(NetworkAgentInfo nai, NetworkCapabilities prevNc,
diff --git a/services/core/java/com/android/server/connectivity/NetworkNotificationManager.java b/services/core/java/com/android/server/connectivity/NetworkNotificationManager.java
index 3385393..0563fcd 100644
--- a/services/core/java/com/android/server/connectivity/NetworkNotificationManager.java
+++ b/services/core/java/com/android/server/connectivity/NetworkNotificationManager.java
@@ -43,7 +43,6 @@
 import com.android.internal.R;
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.messages.nano.SystemMessageProto.SystemMessage;
-import com.android.internal.notification.SystemNotificationChannels;
 
 public class NetworkNotificationManager {
 
@@ -74,7 +73,12 @@
 
     private static final String TAG = NetworkNotificationManager.class.getSimpleName();
     private static final boolean DBG = true;
-    private static final boolean VDBG = false;
+
+    // Notification channels used by ConnectivityService mainline module, it should be aligned with
+    // SystemNotificationChannels.
+    public static final String NOTIFICATION_NETWORK_STATUS = "NETWORK_STATUS";
+    public static final String NOTIFICATION_NETWORK_ALERTS = "NETWORK_ALERTS";
+    public static final String NOTIFICATION_VPN = "VPN";
 
     // The context is for the current user (system server)
     private final Context mContext;
@@ -259,8 +263,7 @@
         // the tag.
         final boolean hasPreviousNotification = previousNotifyType != null;
         final String channelId = (highPriority && !hasPreviousNotification)
-                ? SystemNotificationChannels.NETWORK_ALERTS
-                : SystemNotificationChannels.NETWORK_STATUS;
+                ? NOTIFICATION_NETWORK_ALERTS : NOTIFICATION_NETWORK_STATUS;
         Notification.Builder builder = new Notification.Builder(mContext, channelId)
                 .setWhen(System.currentTimeMillis())
                 .setShowWhen(notifyType == NotificationType.NETWORK_SWITCH)
diff --git a/tests/net/common/java/android/net/OemNetworkPreferencesTest.java b/tests/net/common/java/android/net/OemNetworkPreferencesTest.java
new file mode 100644
index 0000000..b77ed6a
--- /dev/null
+++ b/tests/net/common/java/android/net/OemNetworkPreferencesTest.java
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2020 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 static com.android.testutils.MiscAsserts.assertThrows;
+import static com.android.testutils.ParcelUtils.assertParcelSane;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import android.util.SparseArray;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RunWith(AndroidJUnit4.class)
+@SmallTest
+public class OemNetworkPreferencesTest {
+
+    private static final int TEST_PREF = OemNetworkPreferences.OEM_NETWORK_PREFERENCE_DEFAULT;
+    private static final String TEST_PACKAGE = "com.google.apps.contacts";
+
+    private final List<String> mPackages = new ArrayList<>();
+    private final OemNetworkPreferences.Builder mBuilder = new OemNetworkPreferences.Builder();
+
+    @Before
+    public void beforeEachTestMethod() {
+        mPackages.add(TEST_PACKAGE);
+    }
+
+    @Test
+    public void builderAddNetworkPreferenceRequiresNonNullPackages() {
+        assertThrows(NullPointerException.class,
+                () -> mBuilder.addNetworkPreference(TEST_PREF, null));
+    }
+
+    @Test
+    public void getNetworkPreferencesReturnsCorrectValue() {
+        final int expectedNumberOfMappings = 1;
+        mBuilder.addNetworkPreference(TEST_PREF, mPackages);
+
+        final SparseArray<List<String>> networkPreferences =
+                mBuilder.build().getNetworkPreferences();
+
+        assertEquals(expectedNumberOfMappings, networkPreferences.size());
+        assertEquals(mPackages.size(), networkPreferences.get(TEST_PREF).size());
+        assertEquals(mPackages.get(0), networkPreferences.get(TEST_PREF).get(0));
+    }
+
+    @Test
+    public void getNetworkPreferencesReturnsUnmodifiableValue() {
+        final String newPackage = "new.com.google.apps.contacts";
+        mBuilder.addNetworkPreference(TEST_PREF, mPackages);
+
+        final SparseArray<List<String>> networkPreferences =
+                mBuilder.build().getNetworkPreferences();
+
+        assertThrows(UnsupportedOperationException.class,
+                () -> networkPreferences.get(TEST_PREF).set(mPackages.size() - 1, newPackage));
+
+        assertThrows(UnsupportedOperationException.class,
+                () -> networkPreferences.get(TEST_PREF).add(newPackage));
+    }
+
+    @Test
+    public void toStringReturnsCorrectValue() {
+        mBuilder.addNetworkPreference(TEST_PREF, mPackages);
+
+        final String networkPreferencesString = mBuilder.build().getNetworkPreferences().toString();
+
+        assertTrue(networkPreferencesString.contains(Integer.toString(TEST_PREF)));
+        assertTrue(networkPreferencesString.contains(TEST_PACKAGE));
+    }
+
+    @Test
+    public void testOemNetworkPreferencesParcelable() {
+        mBuilder.addNetworkPreference(TEST_PREF, mPackages);
+
+        final OemNetworkPreferences prefs = mBuilder.build();
+
+        assertParcelSane(prefs, 1 /* fieldCount */);
+    }
+}