Clean up flag ipsec_transform_state

Bug: 308011229
Test: atest FrameworksVcnTests && atest CtsVcnTestCases
Flag: EXEMPT flag clean up
Change-Id: I1ebbdbbd5e4d9e17fe05bba8d9d75ffbb7c79699
diff --git a/core/java/android/net/flags.aconfig b/core/java/android/net/flags.aconfig
index 48eb968..f7dc790 100644
--- a/core/java/android/net/flags.aconfig
+++ b/core/java/android/net/flags.aconfig
@@ -5,13 +5,6 @@
 # Flags used for module APIs must be in aconfig files under each modules
 
 flag {
-  name: "ipsec_transform_state"
-  namespace: "core_networking_ipsec"
-  description: "The flag controls the access for getIpSecTransformState and IpSecTransformState"
-  bug: "308011229"
-}
-
-flag {
     name: "powered_off_finding_platform"
     namespace: "nearby"
     description: "Controls whether the Powered Off Finding feature is enabled"
diff --git a/services/core/java/com/android/server/vcn/VcnContext.java b/services/core/java/com/android/server/vcn/VcnContext.java
index a492a72..6ce8685 100644
--- a/services/core/java/com/android/server/vcn/VcnContext.java
+++ b/services/core/java/com/android/server/vcn/VcnContext.java
@@ -18,7 +18,6 @@
 
 import android.annotation.NonNull;
 import android.content.Context;
-import android.net.IpSecTransformState;
 import android.net.vcn.FeatureFlags;
 import android.net.vcn.FeatureFlagsImpl;
 import android.os.Looper;
@@ -70,19 +69,6 @@
         return mIsInTestMode;
     }
 
-    public boolean isFlagIpSecTransformStateEnabled() {
-        // TODO: b/328844044: Ideally this code should gate the behavior by checking the
-        // android.net.platform.flags.ipsec_transform_state flag but that flag is not accessible
-        // right now. We should either update the code when the flag is accessible or remove the
-        // legacy behavior after VIC SDK finalization
-        try {
-            new IpSecTransformState.Builder();
-            return true;
-        } catch (Exception e) {
-            return false;
-        }
-    }
-
     @NonNull
     public FeatureFlags getFeatureFlags() {
         return mFeatureFlags;
diff --git a/services/core/java/com/android/server/vcn/VcnGatewayConnection.java b/services/core/java/com/android/server/vcn/VcnGatewayConnection.java
index 189b608..2d3bc84 100644
--- a/services/core/java/com/android/server/vcn/VcnGatewayConnection.java
+++ b/services/core/java/com/android/server/vcn/VcnGatewayConnection.java
@@ -1912,8 +1912,7 @@
                 // Transforms do not need to be persisted; the IkeSession will keep them alive
                 mIpSecManager.applyTunnelModeTransform(tunnelIface, direction, transform);
 
-                if (direction == IpSecManager.DIRECTION_IN
-                        && mVcnContext.isFlagIpSecTransformStateEnabled()) {
+                if (direction == IpSecManager.DIRECTION_IN) {
                     mUnderlyingNetworkController.updateInboundTransform(mUnderlying, transform);
                 }
 
diff --git a/services/core/java/com/android/server/vcn/routeselection/IpSecPacketLossDetector.java b/services/core/java/com/android/server/vcn/routeselection/IpSecPacketLossDetector.java
index 6f1e15b..16ab51e 100644
--- a/services/core/java/com/android/server/vcn/routeselection/IpSecPacketLossDetector.java
+++ b/services/core/java/com/android/server/vcn/routeselection/IpSecPacketLossDetector.java
@@ -148,12 +148,6 @@
 
         Objects.requireNonNull(deps, "Missing deps");
 
-        if (!vcnContext.isFlagIpSecTransformStateEnabled()) {
-            // Caller error
-            logWtf("ipsecTransformState flag disabled");
-            throw new IllegalAccessException("ipsecTransformState flag disabled");
-        }
-
         mHandler = new Handler(getVcnContext().getLooper());
 
         mPowerManager = getVcnContext().getContext().getSystemService(PowerManager.class);
diff --git a/services/core/java/com/android/server/vcn/routeselection/UnderlyingNetworkController.java b/services/core/java/com/android/server/vcn/routeselection/UnderlyingNetworkController.java
index 0b9b677..3eeeece 100644
--- a/services/core/java/com/android/server/vcn/routeselection/UnderlyingNetworkController.java
+++ b/services/core/java/com/android/server/vcn/routeselection/UnderlyingNetworkController.java
@@ -204,10 +204,8 @@
         List<NetworkCallback> oldCellCallbacks = new ArrayList<>(mCellBringupCallbacks);
         mCellBringupCallbacks.clear();
 
-        if (mVcnContext.isFlagIpSecTransformStateEnabled()) {
-            for (UnderlyingNetworkEvaluator evaluator : mUnderlyingNetworkRecords.values()) {
-                evaluator.close();
-            }
+        for (UnderlyingNetworkEvaluator evaluator : mUnderlyingNetworkRecords.values()) {
+            evaluator.close();
         }
 
         mUnderlyingNetworkRecords.clear();
@@ -429,10 +427,7 @@
         if (oldSnapshot
                 .getAllSubIdsInGroup(mSubscriptionGroup)
                 .equals(newSnapshot.getAllSubIdsInGroup(mSubscriptionGroup))) {
-
-            if (mVcnContext.isFlagIpSecTransformStateEnabled()) {
-                reevaluateNetworks();
-            }
+            reevaluateNetworks();
             return;
         }
         registerOrUpdateNetworkRequests();
@@ -445,11 +440,6 @@
      */
     public void updateInboundTransform(
             @NonNull UnderlyingNetworkRecord currentNetwork, @NonNull IpSecTransform transform) {
-        if (!mVcnContext.isFlagIpSecTransformStateEnabled()) {
-            logWtf("#updateInboundTransform: unexpected call; flags missing");
-            return;
-        }
-
         Objects.requireNonNull(currentNetwork, "currentNetwork is null");
         Objects.requireNonNull(transform, "transform is null");
 
@@ -572,10 +562,7 @@
 
         @Override
         public void onLost(@NonNull Network network) {
-            if (mVcnContext.isFlagIpSecTransformStateEnabled()) {
-                mUnderlyingNetworkRecords.get(network).close();
-            }
-
+            mUnderlyingNetworkRecords.get(network).close();
             mUnderlyingNetworkRecords.remove(network);
 
             reevaluateNetworks();
@@ -648,11 +635,6 @@
     class NetworkEvaluatorCallbackImpl implements NetworkEvaluatorCallback {
         @Override
         public void onEvaluationResultChanged() {
-            if (!mVcnContext.isFlagIpSecTransformStateEnabled()) {
-                logWtf("#onEvaluationResultChanged: unexpected call; flags missing");
-                return;
-            }
-
             mVcnContext.ensureRunningOnLooperThread();
             reevaluateNetworks();
         }
diff --git a/services/core/java/com/android/server/vcn/routeselection/UnderlyingNetworkEvaluator.java b/services/core/java/com/android/server/vcn/routeselection/UnderlyingNetworkEvaluator.java
index 448a7eb..08be11e 100644
--- a/services/core/java/com/android/server/vcn/routeselection/UnderlyingNetworkEvaluator.java
+++ b/services/core/java/com/android/server/vcn/routeselection/UnderlyingNetworkEvaluator.java
@@ -102,17 +102,15 @@
         updatePriorityClass(
                 underlyingNetworkTemplates, subscriptionGroup, lastSnapshot, carrierConfig);
 
-        if (isIpSecPacketLossDetectorEnabled()) {
-            try {
-                mMetricMonitors.add(
-                        mDependencies.newIpSecPacketLossDetector(
-                                mVcnContext,
-                                mNetworkRecordBuilder.getNetwork(),
-                                carrierConfig,
-                                new MetricMonitorCallbackImpl()));
-            } catch (IllegalAccessException e) {
-                // No action. Do not add anything to mMetricMonitors
-            }
+        try {
+            mMetricMonitors.add(
+                    mDependencies.newIpSecPacketLossDetector(
+                            mVcnContext,
+                            mNetworkRecordBuilder.getNetwork(),
+                            carrierConfig,
+                            new MetricMonitorCallbackImpl()));
+        } catch (IllegalAccessException e) {
+            // No action. Do not add anything to mMetricMonitors
         }
     }
 
@@ -188,22 +186,12 @@
         }
     }
 
-    private boolean isIpSecPacketLossDetectorEnabled() {
-        return isIpSecPacketLossDetectorEnabled(mVcnContext);
-    }
-
-    private static boolean isIpSecPacketLossDetectorEnabled(VcnContext vcnContext) {
-        return vcnContext.isFlagIpSecTransformStateEnabled();
-    }
-
     /** Get the comparator for UnderlyingNetworkEvaluator */
     public static Comparator<UnderlyingNetworkEvaluator> getComparator(VcnContext vcnContext) {
         return (left, right) -> {
-            if (isIpSecPacketLossDetectorEnabled(vcnContext)) {
-                if (left.mIsPenalized != right.mIsPenalized) {
-                    // A penalized network should have lower priority which means a larger index
-                    return left.mIsPenalized ? 1 : -1;
-                }
+            if (left.mIsPenalized != right.mIsPenalized) {
+                // A penalized network should have lower priority which means a larger index
+                return left.mIsPenalized ? 1 : -1;
             }
 
             final int leftIndex = left.mPriorityClass;
diff --git a/tests/vcn/java/com/android/server/vcn/VcnGatewayConnectionTestBase.java b/tests/vcn/java/com/android/server/vcn/VcnGatewayConnectionTestBase.java
index e045f10..4c7b25a 100644
--- a/tests/vcn/java/com/android/server/vcn/VcnGatewayConnectionTestBase.java
+++ b/tests/vcn/java/com/android/server/vcn/VcnGatewayConnectionTestBase.java
@@ -223,7 +223,6 @@
         doReturn(mVcnNetworkProvider).when(mVcnContext).getVcnNetworkProvider();
         doReturn(mFeatureFlags).when(mVcnContext).getFeatureFlags();
         doReturn(true).when(mVcnContext).isFlagSafeModeTimeoutConfigEnabled();
-        doReturn(true).when(mVcnContext).isFlagIpSecTransformStateEnabled();
 
         doReturn(mUnderlyingNetworkController)
                 .when(mDeps)
diff --git a/tests/vcn/java/com/android/server/vcn/routeselection/NetworkEvaluationTestBase.java b/tests/vcn/java/com/android/server/vcn/routeselection/NetworkEvaluationTestBase.java
index bc7ff47..441b780 100644
--- a/tests/vcn/java/com/android/server/vcn/routeselection/NetworkEvaluationTestBase.java
+++ b/tests/vcn/java/com/android/server/vcn/routeselection/NetworkEvaluationTestBase.java
@@ -20,7 +20,6 @@
 import static com.android.server.vcn.routeselection.UnderlyingNetworkControllerTest.getLinkPropertiesWithName;
 
 import static org.mockito.Mockito.doNothing;
-import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.when;
@@ -127,8 +126,6 @@
                                 false /* isInTestMode */));
         doNothing().when(mVcnContext).ensureRunningOnLooperThread();
 
-        doReturn(true).when(mVcnContext).isFlagIpSecTransformStateEnabled();
-
         setupSystemService(
                 mContext,
                 mConnectivityManager,
diff --git a/tests/vcn/java/com/android/server/vcn/routeselection/UnderlyingNetworkControllerTest.java b/tests/vcn/java/com/android/server/vcn/routeselection/UnderlyingNetworkControllerTest.java
index 6f31d8d..e540932 100644
--- a/tests/vcn/java/com/android/server/vcn/routeselection/UnderlyingNetworkControllerTest.java
+++ b/tests/vcn/java/com/android/server/vcn/routeselection/UnderlyingNetworkControllerTest.java
@@ -226,7 +226,6 @@
     private void resetVcnContext(VcnContext vcnContext) {
         reset(vcnContext);
         doNothing().when(vcnContext).ensureRunningOnLooperThread();
-        doReturn(true).when(vcnContext).isFlagIpSecTransformStateEnabled();
     }
 
     // Package private for use in NetworkPriorityClassifierTest