[MS68.3] Address comments at aosp/1958144

Test: atest TrafficStatsTest NetworkUsageStatsTest FrameworksNetTests
Bug: 204830222
Change-Id: I5a54b44294021d64d8506eeb570db0db8544472a

framework-t/src/android/app/usage/NetworkStatsManager.java

@@ -740,8 +740,9 @@ public class NetworkStatsManager {
      * {@link #unregisterUsageCallback} is called.
      *
      * @param template Template used to match networks. See {@link NetworkTemplate}.
-     * @param thresholdBytes Threshold in bytes to be notified on. The provided value that lower
+     * @param thresholdBytes Threshold in bytes to be notified on. Provided values lower than 2MiB
-     *                       than 2MiB will be clamped for non-privileged callers.
+     *                       will be clamped for callers except callers with the NETWORK_STACK
+     *                       permission.
      * @param executor The executor on which callback will be invoked. The provided {@link Executor}
      *                 must run callback sequentially, otherwise the order of callbacks cannot be
      *                 guaranteed.
@@ -750,6 +751,9 @@ public class NetworkStatsManager {
      * @hide
      */
     @SystemApi(client = MODULE_LIBRARIES)
+    @RequiresPermission(anyOf = {
+            NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK,
+            android.Manifest.permission.NETWORK_STACK}, conditional = true)
     public void registerUsageCallback(@NonNull NetworkTemplate template, long thresholdBytes,
             @NonNull @CallbackExecutor Executor executor, @NonNull UsageCallback callback) {
         Objects.requireNonNull(template, "NetworkTemplate cannot be null");

service-t/src/com/android/server/net/NetworkStatsObservers.java

@@ -19,8 +19,11 @@ package com.android.server.net;
 import static android.app.usage.NetworkStatsManager.MIN_THRESHOLD_BYTES;
 
 import android.app.usage.NetworkStatsManager;
+import android.content.Context;
+import android.content.pm.PackageManager;
 import android.net.DataUsageRequest;
 import android.net.NetworkIdentitySet;
+import android.net.NetworkStack;
 import android.net.NetworkStats;
 import android.net.NetworkStatsAccess;
 import android.net.NetworkStatsCollection;
@@ -74,9 +77,9 @@ class NetworkStatsObservers {
      *
      * @return the normalized request wrapped within {@link RequestInfo}.
      */
-    public DataUsageRequest register(DataUsageRequest inputRequest, IUsageCallback callback,
+    public DataUsageRequest register(Context context, DataUsageRequest inputRequest,
-            int callingUid, @NetworkStatsAccess.Level int accessLevel) {
+            IUsageCallback callback, int callingUid, @NetworkStatsAccess.Level int accessLevel) {
-        DataUsageRequest request = buildRequest(inputRequest, callingUid);
+        DataUsageRequest request = buildRequest(context, inputRequest, callingUid);
         RequestInfo requestInfo = buildRequestInfo(request, callback, callingUid,
                 accessLevel);
 
@@ -194,10 +197,13 @@ class NetworkStatsObservers {
         }
     }
 
-    private DataUsageRequest buildRequest(DataUsageRequest request, int callingUid) {
+    private DataUsageRequest buildRequest(Context context, DataUsageRequest request,
-        // For non-system uid, cap the minimum threshold to a safe default to avoid too
+                int callingUid) {
-        // many callbacks.
+        // For non-NETWORK_STACK permission uid, cap the minimum threshold to a safe default to
-        long thresholdInBytes = (callingUid == Process.SYSTEM_UID ? request.thresholdInBytes
+        // avoid too many callbacks.
+        final long thresholdInBytes = (context.checkPermission(
+                NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK, Process.myPid(), callingUid)
+                == PackageManager.PERMISSION_GRANTED ? request.thresholdInBytes
                 : Math.max(MIN_THRESHOLD_BYTES, request.thresholdInBytes));
         if (thresholdInBytes > request.thresholdInBytes) {
             Log.w(TAG, "Threshold was too low for " + request

service-t/src/com/android/server/net/NetworkStatsService.java

@@ -1229,7 +1229,7 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
         DataUsageRequest normalizedRequest;
         final long token = Binder.clearCallingIdentity();
         try {
-            normalizedRequest = mStatsObservers.register(
+            normalizedRequest = mStatsObservers.register(mContext,
                     request, callback, callingUid, accessLevel);
         } finally {
             Binder.restoreCallingIdentity(token);