Merge changes from topic "ipsec-sync-with-pi"

* changes:
  Disable the AppOp Restriction for IpSec Tunnels
  Rework Exception Handling for IpSecManager
  Update IpSecManager to use InetAddress and prefixLen
  Add AppOps Checks for MANAGE_IPSEC_TUNNELS
  Add MANAGE_IPSEC_TUNNELS Permission
diff --git a/services/core/java/com/android/server/net/NetworkStatsService.java b/services/core/java/com/android/server/net/NetworkStatsService.java
index da40692..e5cf394 100644
--- a/services/core/java/com/android/server/net/NetworkStatsService.java
+++ b/services/core/java/com/android/server/net/NetworkStatsService.java
@@ -179,6 +179,8 @@
 
     private final PowerManager.WakeLock mWakeLock;
 
+    private final boolean mUseBpfTrafficStats;
+
     private IConnectivityManager mConnManager;
 
     @VisibleForTesting
@@ -328,6 +330,7 @@
         mStatsObservers = checkNotNull(statsObservers, "missing NetworkStatsObservers");
         mSystemDir = checkNotNull(systemDir, "missing systemDir");
         mBaseDir = checkNotNull(baseDir, "missing baseDir");
+        mUseBpfTrafficStats = new File("/sys/fs/bpf/traffic_uid_stats_map").exists();
     }
 
     @VisibleForTesting
@@ -916,7 +919,7 @@
     }
 
     private boolean checkBpfStatsEnable() {
-        return new File("/sys/fs/bpf/traffic_uid_stats_map").exists();
+        return mUseBpfTrafficStats;
     }
 
     /**