diff --git a/core/java/android/net/Network.java b/core/java/android/net/Network.java
index 903b602b42..1a3ce9124b 100644
--- a/core/java/android/net/Network.java
+++ b/core/java/android/net/Network.java
@@ -21,6 +21,7 @@ import android.os.Parcelable;
 import android.system.ErrnoException;
 import android.system.Os;
 import android.system.OsConstants;
+import android.util.proto.ProtoOutputStream;
 
 import com.android.okhttp.internalandroidapi.Dns;
 import com.android.okhttp.internalandroidapi.HttpURLConnectionFactory;
@@ -402,4 +403,11 @@ public class Network implements Parcelable {
     public String toString() {
         return Integer.toString(netId);
     }
+
+    /** @hide */
+    public void writeToProto(ProtoOutputStream proto, long fieldId) {
+        final long token = proto.start(fieldId);
+        proto.write(NetworkProto.NET_ID, netId);
+        proto.end(token);
+    }
 }
diff --git a/core/java/android/net/NetworkCapabilities.java b/core/java/android/net/NetworkCapabilities.java
index f468e5d2f9..8b03fa81d4 100644
--- a/core/java/android/net/NetworkCapabilities.java
+++ b/core/java/android/net/NetworkCapabilities.java
@@ -20,6 +20,7 @@ import android.annotation.IntDef;
 import android.net.ConnectivityManager.NetworkCallback;
 import android.os.Parcel;
 import android.os.Parcelable;
+import android.util.proto.ProtoOutputStream;
 
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.util.BitUtils;
@@ -1016,6 +1017,31 @@ public final class NetworkCapabilities implements Parcelable {
         return "[" + transports + capabilities + upBand + dnBand + specifier + signalStrength + "]";
     }
 
+    /** @hide */
+    public void writeToProto(ProtoOutputStream proto, long fieldId) {
+        final long token = proto.start(fieldId);
+
+        for (int transport : getTransportTypes()) {
+            proto.write(NetworkCapabilitiesProto.TRANSPORTS, transport);
+        }
+
+        for (int capability : getCapabilities()) {
+            proto.write(NetworkCapabilitiesProto.CAPABILITIES, capability);
+        }
+
+        proto.write(NetworkCapabilitiesProto.LINK_UP_BANDWIDTH_KBPS, mLinkUpBandwidthKbps);
+        proto.write(NetworkCapabilitiesProto.LINK_DOWN_BANDWIDTH_KBPS, mLinkDownBandwidthKbps);
+
+        if (mNetworkSpecifier != null) {
+            proto.write(NetworkCapabilitiesProto.NETWORK_SPECIFIER, mNetworkSpecifier.toString());
+        }
+
+        proto.write(NetworkCapabilitiesProto.CAN_REPORT_SIGNAL_STRENGTH, hasSignalStrength());
+        proto.write(NetworkCapabilitiesProto.SIGNAL_STRENGTH, mSignalStrength);
+
+        proto.end(token);
+    }
+
     /**
      * @hide
      */
diff --git a/core/java/android/net/NetworkRequest.java b/core/java/android/net/NetworkRequest.java
index 97ded2d73b..a0724091ab 100644
--- a/core/java/android/net/NetworkRequest.java
+++ b/core/java/android/net/NetworkRequest.java
@@ -20,6 +20,7 @@ import android.annotation.NonNull;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.text.TextUtils;
+import android.util.proto.ProtoOutputStream;
 
 import java.util.Objects;
 
@@ -389,6 +390,35 @@ public class NetworkRequest implements Parcelable {
                 ", " + networkCapabilities.toString() + " ]";
     }
 
+    private int typeToProtoEnum(Type t) {
+        switch (t) {
+            case NONE:
+                return NetworkRequestProto.TYPE_NONE;
+            case LISTEN:
+                return NetworkRequestProto.TYPE_LISTEN;
+            case TRACK_DEFAULT:
+                return NetworkRequestProto.TYPE_TRACK_DEFAULT;
+            case REQUEST:
+                return NetworkRequestProto.TYPE_REQUEST;
+            case BACKGROUND_REQUEST:
+                return NetworkRequestProto.TYPE_BACKGROUND_REQUEST;
+            default:
+                return NetworkRequestProto.TYPE_UNKNOWN;
+        }
+    }
+
+    /** @hide */
+    public void writeToProto(ProtoOutputStream proto, long fieldId) {
+        final long token = proto.start(fieldId);
+
+        proto.write(NetworkRequestProto.TYPE, typeToProtoEnum(type));
+        proto.write(NetworkRequestProto.REQUEST_ID, requestId);
+        proto.write(NetworkRequestProto.LEGACY_TYPE, legacyType);
+        networkCapabilities.writeToProto(proto, NetworkRequestProto.NETWORK_CAPABILITIES);
+
+        proto.end(token);
+    }
+
     public boolean equals(Object obj) {
         if (obj instanceof NetworkRequest == false) return false;
         NetworkRequest that = (NetworkRequest)obj;