Don't allow upstream if entitlement don't know any downstream

In case tethering donwstream is setup but don't ask EntitlementManager
to run provisioning. Cellular upstream should not be allowed if
EntilementManager don't have any donwstream record.

Bug: 134649258
Test: -build, flash, boot
      -manual test with carrier SIM
Change-Id: I609722c79f0a45a1c2164d39721ef5883e436feb

services/core/java/com/android/server/connectivity/tethering/EntitlementManager.java

@@ -161,6 +161,12 @@ public class EntitlementManager {
      * Check if cellular upstream is permitted.
      */
     public boolean isCellularUpstreamPermitted() {
+        // If provisioning is required and EntitlementManager don't know any downstream,
+        // cellular upstream should not be allowed.
+        final TetheringConfiguration config = mFetcher.fetchTetheringConfiguration();
+        if (mCurrentTethers.size() == 0 && isTetherProvisioningRequired(config)) {
+            return false;
+        }
         return mCellularUpstreamPermitted;
     }
 

tests/net/java/com/android/server/connectivity/tethering/EntitlementManagerTest.java

@@ -405,6 +405,13 @@ public final class EntitlementManagerTest {
 
     }
 
+    @Test
+    public void verifyPermissionWhenProvisioningNotStarted() {
+        assertTrue(mEnMgr.isCellularUpstreamPermitted());
+        setupForRequiredProvisioning();
+        assertFalse(mEnMgr.isCellularUpstreamPermitted());
+    }
+
     @Test
     public void testRunTetherProvisioning() {
         setupForRequiredProvisioning();