Move some constants from TrafficStatsConstants to NetworkStackConstants

Keep the constants are only used by framework in TrafficStatsConstants
and move the others to NetworkStackConstants which is in libs/net.

Bug: 182349970
Test: FrameworksNetTests
      NetworkStackTests
      TetheringTests
Change-Id: Ib667c115e5f1e01237d88b77bba753363da309cc

Android.bp

@@ -917,7 +917,6 @@ filegroup {
         "core/java/com/android/internal/util/RingBufferIndices.java",
         "core/java/com/android/internal/util/State.java",
         "core/java/com/android/internal/util/StateMachine.java",
-        "core/java/com/android/internal/util/TrafficStatsConstants.java",
         "core/java/com/android/internal/util/WakeupMessage.java",
         "core/java/com/android/internal/util/TokenBucket.java",
     ],
@@ -944,7 +943,6 @@ filegroup {
         "core/java/com/android/internal/util/MessageUtils.java",
         "core/java/com/android/internal/util/State.java",
         "core/java/com/android/internal/util/StateMachine.java",
-        "core/java/com/android/internal/util/TrafficStatsConstants.java",
         "core/java/com/android/internal/util/WakeupMessage.java",
     ],
 }

core/java/com/android/internal/util/TrafficStatsConstants.java

@@ -21,24 +21,8 @@ package com.android.internal.util;
  * @hide
  */
 public class TrafficStatsConstants {
-    // These tags are used by the network stack to do traffic for its own purposes. Traffic
-    // tagged with these will be counted toward the network stack and must stay inside the
-    // range defined by
-    // {@link android.net.TrafficStats#TAG_NETWORK_STACK_RANGE_START} and
-    // {@link android.net.TrafficStats#TAG_NETWORK_STACK_RANGE_END}.
-    public static final int TAG_SYSTEM_DHCP = 0xFFFFFE01;
-    public static final int TAG_SYSTEM_NEIGHBOR = 0xFFFFFE02;
-    public static final int TAG_SYSTEM_DHCP_SERVER = 0xFFFFFE03;
 
     public static final int TAG_SYSTEM_NTP = 0xFFFFFF41;
     public static final int TAG_SYSTEM_GPS = 0xFFFFFF44;
     public static final int TAG_SYSTEM_PAC = 0xFFFFFF45;
-
-    // These tags are used by the network stack to do traffic on behalf of apps. Traffic
-    // tagged with these will be counted toward the app on behalf of which the network
-    // stack is doing this traffic. These values must stay inside the range defined by
-    // {@link android.net.TrafficStats#TAG_NETWORK_STACK_IMPERSONATION_RANGE_START} and
-    // {@link android.net.TrafficStats#TAG_NETWORK_STACK_IMPERSONATION_RANGE_END}.
-    public static final int TAG_SYSTEM_PROBE = 0xFFFFFF81;
-    public static final int TAG_SYSTEM_DNS = 0xFFFFFF82;
 }

packages/CarrierDefaultApp/src/com/android/carrierdefaultapp/CaptivePortalLoginActivity.java

@@ -50,7 +50,7 @@ import android.widget.ProgressBar;
 import android.widget.TextView;
 
 import com.android.internal.util.ArrayUtils;
-import com.android.internal.util.TrafficStatsConstants;
+import com.android.net.module.util.NetworkStackConstants;
 
 import java.io.IOException;
 import java.lang.reflect.Field;
@@ -239,7 +239,7 @@ public class CaptivePortalLoginActivity extends Activity {
                 HttpURLConnection urlConnection = null;
                 int httpResponseCode = 500;
                 int oldTag = TrafficStats.getAndSetThreadStatsTag(
-                        TrafficStatsConstants.TAG_SYSTEM_PROBE);
+                        NetworkStackConstants.TAG_SYSTEM_PROBE);
                 try {
                     urlConnection = (HttpURLConnection) mNetwork.openConnection(
                             new URL(mCm.getCaptivePortalServerUrl()));

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

@@ -36,7 +36,7 @@ import android.text.TextUtils;
 import android.util.Pair;
 
 import com.android.internal.util.IndentingPrintWriter;
-import com.android.internal.util.TrafficStatsConstants;
+import com.android.net.module.util.NetworkStackConstants;
 
 import libcore.io.IoUtils;
 
@@ -446,7 +446,7 @@ public class NetworkDiagnostics {
                 int sockType, int protocol, long writeTimeout, long readTimeout, int dstPort)
                 throws ErrnoException, IOException {
             final int oldTag = TrafficStats.getAndSetThreadStatsTag(
-                    TrafficStatsConstants.TAG_SYSTEM_PROBE);
+                    NetworkStackConstants.TAG_SYSTEM_PROBE);
             try {
                 mFileDescriptor = Os.socket(mAddressFamily, sockType, protocol);
             } finally {
@@ -745,7 +745,7 @@ public class NetworkDiagnostics {
             if (ensureMeasurementNecessary()) return;
 
             // No need to restore the tag, since this thread is only used for this measurement.
-            TrafficStats.getAndSetThreadStatsTag(TrafficStatsConstants.TAG_SYSTEM_PROBE);
+            TrafficStats.getAndSetThreadStatsTag(NetworkStackConstants.TAG_SYSTEM_PROBE);
 
             try (SSLSocket sslSocket = setupSSLSocket()) {
                 sendDoTProbe(sslSocket);