Add multipath preference, background status API

Add APIs for getMultipathPreference and getRestrictBackgroundStatus.
Both are used by Connectivity to back the external
ConnectivityManager.getRestrictBackgroundStatus, and
ConnectivityManager.getMultipathPreference APIs.

Test: atest CtsNetTestCases
      atest ConnectivityServiceTests
      atest NetworkPolicyManagerServiceTest
Bug: 176289731
Change-Id: I8a03162b2f6691086bb64e75ffd354cdfca7f86a
Merged-In: I8a03162b2f6691086bb64e75ffd354cdfca7f86a

2 files changed, 31 insertions, 2 deletions

diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index f527da582959..4ac249aa8d31 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -106,6 +106,7 @@ import android.net.ConnectivityDiagnosticsManager.ConnectivityReport;
 import android.net.ConnectivityDiagnosticsManager.DataStallReport;
 import android.net.ConnectivityManager;
 import android.net.ConnectivityManager.NetworkCallback;
+import android.net.ConnectivityManager.RestrictBackgroundStatus;
 import android.net.ConnectivitySettingsManager;
 import android.net.DataStallReportParcelable;
 import android.net.DnsResolverServiceManager;
@@ -1997,6 +1998,18 @@ public class ConnectivityService extends IConnectivityManager.Stub
         }
     }
 
+    @Override
+    public @RestrictBackgroundStatus int getRestrictBackgroundStatusByCaller() {
+        enforceAccessPermission();
+        final int callerUid = Binder.getCallingUid();
+        final long token = Binder.clearCallingIdentity();
+        try {
+            return mPolicyManager.getRestrictBackgroundStatus(callerUid);
+        } finally {
+            Binder.restoreCallingIdentity(token);
+        }
+    }
+
     // TODO: Consider delete this function or turn it into a no-op method.
     @Override
     public NetworkState[] getAllNetworkState() {
@@ -4407,7 +4420,13 @@ public class ConnectivityService extends IConnectivityManager.Stub
         final NetworkPolicyManager netPolicyManager =
                  mContext.getSystemService(NetworkPolicyManager.class);
 
-        final int networkPreference = netPolicyManager.getMultipathPreference(network);
+        final long token = Binder.clearCallingIdentity();
+        final int networkPreference;
+        try {
+            networkPreference = netPolicyManager.getMultipathPreference(network);
+        } finally {
+            Binder.restoreCallingIdentity(token);
+        }
         if (networkPreference != 0) {
             return networkPreference;
         }
diff --git a/services/core/java/com/android/server/net/NetworkPolicyManagerService.java b/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
index b7367e5170c6..aecac7576bcf 100644
--- a/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
+++ b/services/core/java/com/android/server/net/NetworkPolicyManagerService.java
@@ -261,6 +261,7 @@ import com.android.internal.util.IndentingPrintWriter;
 import com.android.internal.util.StatLogger;
 import com.android.internal.util.XmlUtils;
 import com.android.net.module.util.NetworkIdentityUtils;
+import com.android.net.module.util.PermissionUtils;
 import com.android.server.EventLogTags;
 import com.android.server.LocalServices;
 import com.android.server.ServiceThread;
@@ -3112,8 +3113,16 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
     @Override
     public int getRestrictBackgroundByCaller() {
         mContext.enforceCallingOrSelfPermission(ACCESS_NETWORK_STATE, TAG);
-        final int uid = Binder.getCallingUid();
+        return getRestrictBackgroundStatusInternal(Binder.getCallingUid());
+    }
+
+    @Override
+    public int getRestrictBackgroundStatus(int uid) {
+        PermissionUtils.enforceNetworkStackPermission(mContext);
+        return getRestrictBackgroundStatusInternal(uid);
+    }
 
+    private int getRestrictBackgroundStatusInternal(int uid) {
         synchronized (mUidRulesFirstLock) {
             // Must clear identity because getUidPolicy() is restricted to system.
             final long token = Binder.clearCallingIdentity();
@@ -3582,6 +3591,7 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
      * Get multipath preference value for the given network.
      */
     public int getMultipathPreference(Network network) {
+        PermissionUtils.enforceNetworkStackPermission(mContext);
         final Integer preference = mMultipathPolicyTracker.getMultipathPreference(network);
         if (preference != null) {
             return preference;