Merge changes Ifc8ad902,I6d1b8d0e am: 8d659bb1ec

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1453730

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I12bd81925142b20a04448952de67cb72d77b4ccd

5 files changed, 207 insertions, 39 deletions

diff --git a/core/api/system-current.txt b/core/api/system-current.txt
index c30fa9a96f36..dbde3862ddb3 100644
--- a/core/api/system-current.txt
+++ b/core/api/system-current.txt
@@ -6150,6 +6150,7 @@ package android.net {
     method public void close();
     method @NonNull public String getInterfaceName();
     method @RequiresPermission(android.Manifest.permission.MANAGE_IPSEC_TUNNELS) public void removeAddress(@NonNull java.net.InetAddress, int) throws java.io.IOException;
+    method @RequiresPermission(android.Manifest.permission.MANAGE_IPSEC_TUNNELS) public void setUnderlyingNetwork(@NonNull android.net.Network) throws java.io.IOException;
   }
 
   public static class IpSecTransform.Builder {
diff --git a/core/java/android/net/IIpSecService.aidl b/core/java/android/net/IIpSecService.aidl
index d6774d47b49e..933256a3b475 100644
--- a/core/java/android/net/IIpSecService.aidl
+++ b/core/java/android/net/IIpSecService.aidl
@@ -58,6 +58,9 @@ interface IIpSecService
             in LinkAddress localAddr,
             in String callingPackage);
 
+    void setNetworkForTunnelInterface(
+            int tunnelResourceId, in Network underlyingNetwork, in String callingPackage);
+
     void deleteTunnelInterface(int resourceId, in String callingPackage);
 
     IpSecTransformResponse createTransform(
diff --git a/core/java/android/net/IpSecManager.java b/core/java/android/net/IpSecManager.java
index 70bca3019818..98acd98cc465 100644
--- a/core/java/android/net/IpSecManager.java
+++ b/core/java/android/net/IpSecManager.java
@@ -782,6 +782,42 @@ public final class IpSecManager {
             }
         }
 
+        /**
+         * Update the underlying network for this IpSecTunnelInterface.
+         *
+         * <p>This new underlying network will be used for all transforms applied AFTER this call is
+         * complete. Before new {@link IpSecTransform}(s) with matching addresses are applied to
+         * this tunnel interface, traffic will still use the old SA, and be routed on the old
+         * underlying network.
+         *
+         * <p>To migrate IPsec tunnel mode traffic, a caller should:
+         *
+         * <ol>
+         *   <li>Update the IpSecTunnelInterface’s underlying network.
+         *   <li>Apply {@link IpSecTransform}(s) with matching addresses to this
+         *       IpSecTunnelInterface.
+         * </ol>
+         *
+         * @param underlyingNetwork the new {@link Network} that will carry traffic for this tunnel.
+         *     This network MUST never be the network exposing this IpSecTunnelInterface, otherwise
+         *     this method will throw an {@link IllegalArgumentException}.
+         */
+        // TODO: b/169171001 Update the documentation when transform migration is supported.
+        // The purpose of making updating network and applying transforms separate is to leave open
+        // the possibility to support lossless migration procedures. To do that, Android platform
+        // will need to support multiple inbound tunnel mode transforms, just like it can support
+        // multiple transport mode transforms.
+        @RequiresFeature(PackageManager.FEATURE_IPSEC_TUNNELS)
+        @RequiresPermission(android.Manifest.permission.MANAGE_IPSEC_TUNNELS)
+        public void setUnderlyingNetwork(@NonNull Network underlyingNetwork) throws IOException {
+            try {
+                mService.setNetworkForTunnelInterface(
+                        mResourceId, underlyingNetwork, mOpPackageName);
+            } catch (RemoteException e) {
+                throw e.rethrowFromSystemServer();
+            }
+        }
+
         private IpSecTunnelInterface(@NonNull Context ctx, @NonNull IIpSecService service,
                 @NonNull InetAddress localAddress, @NonNull InetAddress remoteAddress,
                 @NonNull Network underlyingNetwork)
diff --git a/services/core/java/com/android/server/IpSecService.java b/services/core/java/com/android/server/IpSecService.java
index f648c3e146de..b48bc900aa84 100644
--- a/services/core/java/com/android/server/IpSecService.java
+++ b/services/core/java/com/android/server/IpSecService.java
@@ -29,6 +29,7 @@ import android.annotation.NonNull;
 import android.app.AppOpsManager;
 import android.content.Context;
 import android.content.pm.PackageManager;
+import android.net.ConnectivityManager;
 import android.net.IIpSecService;
 import android.net.INetd;
 import android.net.InetAddresses;
@@ -41,6 +42,7 @@ import android.net.IpSecTransformResponse;
 import android.net.IpSecTunnelInterfaceResponse;
 import android.net.IpSecUdpEncapResponse;
 import android.net.LinkAddress;
+import android.net.LinkProperties;
 import android.net.Network;
 import android.net.TrafficStats;
 import android.net.util.NetdService;
@@ -797,9 +799,15 @@ public class IpSecService extends IIpSecService.Stub {
         }
     }
 
-    private final class TunnelInterfaceRecord extends OwnedResourceRecord {
+    /**
+     * Tracks an tunnel interface, and manages cleanup paths.
+     *
+     * <p>This class is not thread-safe, and expects that that users of this class will ensure
+     * synchronization and thread safety by holding the IpSecService.this instance lock
+     */
+    @VisibleForTesting
+    final class TunnelInterfaceRecord extends OwnedResourceRecord {
         private final String mInterfaceName;
-        private final Network mUnderlyingNetwork;
 
         // outer addresses
         private final String mLocalAddress;
@@ -810,6 +818,8 @@ public class IpSecService extends IIpSecService.Stub {
 
         private final int mIfId;
 
+        private Network mUnderlyingNetwork;
+
         TunnelInterfaceRecord(
                 int resourceId,
                 String interfaceName,
@@ -870,14 +880,22 @@ public class IpSecService extends IIpSecService.Stub {
             releaseNetId(mOkey);
         }
 
-        public String getInterfaceName() {
-            return mInterfaceName;
+        @GuardedBy("IpSecService.this")
+        public void setUnderlyingNetwork(Network underlyingNetwork) {
+            // When #applyTunnelModeTransform is called, this new underlying network will be used to
+            // update the output mark of the input transform.
+            mUnderlyingNetwork = underlyingNetwork;
         }
 
+        @GuardedBy("IpSecService.this")
         public Network getUnderlyingNetwork() {
             return mUnderlyingNetwork;
         }
 
+        public String getInterfaceName() {
+            return mInterfaceName;
+        }
+
         /** Returns the local, outer address for the tunnelInterface */
         public String getLocalAddress() {
             return mLocalAddress;
@@ -1429,6 +1447,34 @@ public class IpSecService extends IIpSecService.Stub {
         }
     }
 
+    /** Set TunnelInterface to use a specific underlying network. */
+    @Override
+    public synchronized void setNetworkForTunnelInterface(
+            int tunnelResourceId, Network underlyingNetwork, String callingPackage) {
+        enforceTunnelFeatureAndPermissions(callingPackage);
+        Objects.requireNonNull(underlyingNetwork, "No underlying network was specified");
+
+        final UserRecord userRecord = mUserResourceTracker.getUserRecord(Binder.getCallingUid());
+
+        // Get tunnelInterface record; if no such interface is found, will throw
+        // IllegalArgumentException. userRecord.mTunnelInterfaceRecords is never null
+        final TunnelInterfaceRecord tunnelInterfaceInfo =
+                userRecord.mTunnelInterfaceRecords.getResourceOrThrow(tunnelResourceId);
+
+        final ConnectivityManager connectivityManager =
+                mContext.getSystemService(ConnectivityManager.class);
+        final LinkProperties lp = connectivityManager.getLinkProperties(underlyingNetwork);
+        if (tunnelInterfaceInfo.getInterfaceName().equals(lp.getInterfaceName())) {
+            throw new IllegalArgumentException(
+                    "Underlying network cannot be the network being exposed by this tunnel");
+        }
+
+        // It is meaningless to check if the network exists or is valid because the network might
+        // disconnect at any time after it passes the check.
+
+        tunnelInterfaceInfo.setUnderlyingNetwork(underlyingNetwork);
+    }
+
     /**
      * Delete a TunnelInterface that has been been allocated by and registered with the system
      * server
diff --git a/tests/net/java/com/android/server/IpSecServiceParameterizedTest.java b/tests/net/java/com/android/server/IpSecServiceParameterizedTest.java
index 799bcc82d2a9..c86224a71978 100644
--- a/tests/net/java/com/android/server/IpSecServiceParameterizedTest.java
+++ b/tests/net/java/com/android/server/IpSecServiceParameterizedTest.java
@@ -33,6 +33,7 @@ import static org.mockito.Mockito.when;
 import android.app.AppOpsManager;
 import android.content.Context;
 import android.content.pm.PackageManager;
+import android.net.ConnectivityManager;
 import android.net.INetd;
 import android.net.InetAddresses;
 import android.net.IpSecAlgorithm;
@@ -44,6 +45,7 @@ import android.net.IpSecTransformResponse;
 import android.net.IpSecTunnelInterfaceResponse;
 import android.net.IpSecUdpEncapResponse;
 import android.net.LinkAddress;
+import android.net.LinkProperties;
 import android.net.Network;
 import android.os.Binder;
 import android.os.INetworkManagementService;
@@ -53,6 +55,8 @@ import android.test.mock.MockContext;
 
 import androidx.test.filters.SmallTest;
 
+import com.android.server.IpSecService.TunnelInterfaceRecord;
+
 import org.junit.Before;
 import org.junit.Ignore;
 import org.junit.Test;
@@ -109,6 +113,7 @@ public class IpSecServiceParameterizedTest {
     };
 
     AppOpsManager mMockAppOps = mock(AppOpsManager.class);
+    ConnectivityManager mMockConnectivityMgr = mock(ConnectivityManager.class);
 
     MockContext mMockContext = new MockContext() {
         @Override
@@ -116,12 +121,22 @@ public class IpSecServiceParameterizedTest {
             switch(name) {
                 case Context.APP_OPS_SERVICE:
                     return mMockAppOps;
+                case Context.CONNECTIVITY_SERVICE:
+                    return mMockConnectivityMgr;
                 default:
                     return null;
             }
         }
 
         @Override
+        public String getSystemServiceName(Class<?> serviceClass) {
+            if (ConnectivityManager.class == serviceClass) {
+                return Context.CONNECTIVITY_SERVICE;
+            }
+            return null;
+        }
+
+        @Override
         public PackageManager getPackageManager() {
             return mMockPkgMgr;
         }
@@ -151,6 +166,10 @@ public class IpSecServiceParameterizedTest {
             new IpSecAlgorithm(IpSecAlgorithm.AUTH_CRYPT_AES_GCM, AEAD_KEY, 128);
     private static final int REMOTE_ENCAP_PORT = 4500;
 
+    private static final String BLESSED_PACKAGE = "blessedPackage";
+    private static final String SYSTEM_PACKAGE = "systemPackage";
+    private static final String BAD_PACKAGE = "badPackage";
+
     public IpSecServiceParameterizedTest(
             String sourceAddr, String destAddr, String localInnerAddr, int family) {
         mSourceAddr = sourceAddr;
@@ -174,15 +193,15 @@ public class IpSecServiceParameterizedTest {
         when(mMockPkgMgr.hasSystemFeature(anyString())).thenReturn(true);
 
         // A package granted the AppOp for MANAGE_IPSEC_TUNNELS will be MODE_ALLOWED.
-        when(mMockAppOps.noteOp(anyInt(), anyInt(), eq("blessedPackage")))
-            .thenReturn(AppOpsManager.MODE_ALLOWED);
+        when(mMockAppOps.noteOp(anyInt(), anyInt(), eq(BLESSED_PACKAGE)))
+                .thenReturn(AppOpsManager.MODE_ALLOWED);
         // A system package will not be granted the app op, so this should fall back to
         // a permissions check, which should pass.
-        when(mMockAppOps.noteOp(anyInt(), anyInt(), eq("systemPackage")))
-            .thenReturn(AppOpsManager.MODE_DEFAULT);
+        when(mMockAppOps.noteOp(anyInt(), anyInt(), eq(SYSTEM_PACKAGE)))
+                .thenReturn(AppOpsManager.MODE_DEFAULT);
         // A mismatch between the package name and the UID will return MODE_IGNORED.
-        when(mMockAppOps.noteOp(anyInt(), anyInt(), eq("badPackage")))
-            .thenReturn(AppOpsManager.MODE_IGNORED);
+        when(mMockAppOps.noteOp(anyInt(), anyInt(), eq(BAD_PACKAGE)))
+                .thenReturn(AppOpsManager.MODE_IGNORED);
     }
 
     //TODO: Add a test to verify SPI.
@@ -338,7 +357,7 @@ public class IpSecServiceParameterizedTest {
         addAuthAndCryptToIpSecConfig(ipSecConfig);
 
         IpSecTransformResponse createTransformResp =
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
         assertEquals(IpSecManager.Status.OK, createTransformResp.status);
 
         verifyTransformNetdCalledForCreatingSA(ipSecConfig, createTransformResp);
@@ -352,7 +371,7 @@ public class IpSecServiceParameterizedTest {
         ipSecConfig.setAuthenticatedEncryption(AEAD_ALGO);
 
         IpSecTransformResponse createTransformResp =
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
         assertEquals(IpSecManager.Status.OK, createTransformResp.status);
 
         verifyTransformNetdCalledForCreatingSA(ipSecConfig, createTransformResp);
@@ -370,14 +389,14 @@ public class IpSecServiceParameterizedTest {
 
         if (mFamily == AF_INET) {
             IpSecTransformResponse createTransformResp =
-                    mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                    mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
             assertEquals(IpSecManager.Status.OK, createTransformResp.status);
 
             verifyTransformNetdCalledForCreatingSA(ipSecConfig, createTransformResp, udpSock.port);
         } else {
             try {
                 IpSecTransformResponse createTransformResp =
-                        mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                        mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
                 fail("Expected IllegalArgumentException on attempt to use UDP Encap in IPv6");
             } catch (IllegalArgumentException expected) {
             }
@@ -396,14 +415,14 @@ public class IpSecServiceParameterizedTest {
 
         if (mFamily == AF_INET) {
             IpSecTransformResponse createTransformResp =
-                    mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                    mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
             assertEquals(IpSecManager.Status.OK, createTransformResp.status);
 
             verifyTransformNetdCalledForCreatingSA(ipSecConfig, createTransformResp, udpSock.port);
         } else {
             try {
                 IpSecTransformResponse createTransformResp =
-                        mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                        mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
                 fail("Expected IllegalArgumentException on attempt to use UDP Encap in IPv6");
             } catch (IllegalArgumentException expected) {
             }
@@ -417,12 +436,12 @@ public class IpSecServiceParameterizedTest {
         addAuthAndCryptToIpSecConfig(ipSecConfig);
 
         IpSecTransformResponse createTransformResp =
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
         assertEquals(IpSecManager.Status.OK, createTransformResp.status);
 
         // Attempting to create transform a second time with the same SPIs should throw an error...
         try {
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+            mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
                 fail("IpSecService should have thrown an error for reuse of SPI");
         } catch (IllegalStateException expected) {
         }
@@ -430,7 +449,7 @@ public class IpSecServiceParameterizedTest {
         // ... even if the transform is deleted
         mIpSecService.deleteTransform(createTransformResp.resourceId);
         try {
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+            mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
                 fail("IpSecService should have thrown an error for reuse of SPI");
         } catch (IllegalStateException expected) {
         }
@@ -443,7 +462,7 @@ public class IpSecServiceParameterizedTest {
         addAuthAndCryptToIpSecConfig(ipSecConfig);
 
         IpSecTransformResponse createTransformResp =
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
         IpSecService.UserRecord userRecord = mIpSecService.mUserResourceTracker.getUserRecord(mUid);
         assertEquals(1, userRecord.mSpiQuotaTracker.mCurrent);
         mIpSecService.releaseSecurityParameterIndex(ipSecConfig.getSpiResourceId());
@@ -467,7 +486,7 @@ public class IpSecServiceParameterizedTest {
         addAuthAndCryptToIpSecConfig(ipSecConfig);
 
         IpSecTransformResponse createTransformResp =
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
         mIpSecService.deleteTransform(createTransformResp.resourceId);
 
         verify(mMockNetd, times(1))
@@ -515,7 +534,7 @@ public class IpSecServiceParameterizedTest {
         addAuthAndCryptToIpSecConfig(ipSecConfig);
 
         IpSecTransformResponse createTransformResp =
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
 
         IpSecService.UserRecord userRecord = mIpSecService.mUserResourceTracker.getUserRecord(mUid);
         IpSecService.RefcountedResource refcountedRecord =
@@ -562,7 +581,7 @@ public class IpSecServiceParameterizedTest {
         addAuthAndCryptToIpSecConfig(ipSecConfig);
 
         IpSecTransformResponse createTransformResp =
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
 
         if (closeSpiBeforeApply) {
             mIpSecService.releaseSecurityParameterIndex(ipSecConfig.getSpiResourceId());
@@ -592,7 +611,7 @@ public class IpSecServiceParameterizedTest {
         addAuthAndCryptToIpSecConfig(ipSecConfig);
 
         IpSecTransformResponse createTransformResp =
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
 
         // Close SPI record
         mIpSecService.releaseSecurityParameterIndex(ipSecConfig.getSpiResourceId());
@@ -638,7 +657,7 @@ public class IpSecServiceParameterizedTest {
     @Test
     public void testCreateTunnelInterface() throws Exception {
         IpSecTunnelInterfaceResponse createTunnelResp =
-                createAndValidateTunnel(mSourceAddr, mDestinationAddr, "blessedPackage");
+                createAndValidateTunnel(mSourceAddr, mDestinationAddr, BLESSED_PACKAGE);
 
         // Check that we have stored the tracking object, and retrieve it
         IpSecService.UserRecord userRecord = mIpSecService.mUserResourceTracker.getUserRecord(mUid);
@@ -661,11 +680,11 @@ public class IpSecServiceParameterizedTest {
     @Test
     public void testDeleteTunnelInterface() throws Exception {
         IpSecTunnelInterfaceResponse createTunnelResp =
-                createAndValidateTunnel(mSourceAddr, mDestinationAddr, "blessedPackage");
+                createAndValidateTunnel(mSourceAddr, mDestinationAddr, BLESSED_PACKAGE);
 
         IpSecService.UserRecord userRecord = mIpSecService.mUserResourceTracker.getUserRecord(mUid);
 
-        mIpSecService.deleteTunnelInterface(createTunnelResp.resourceId, "blessedPackage");
+        mIpSecService.deleteTunnelInterface(createTunnelResp.resourceId, BLESSED_PACKAGE);
 
         // Verify quota and RefcountedResource objects cleaned up
         assertEquals(0, userRecord.mTunnelQuotaTracker.mCurrent);
@@ -678,10 +697,73 @@ public class IpSecServiceParameterizedTest {
         }
     }
 
+    private Network createFakeUnderlyingNetwork(String interfaceName) {
+        final Network fakeNetwork = new Network(1000);
+        final LinkProperties fakeLp = new LinkProperties();
+        fakeLp.setInterfaceName(interfaceName);
+        when(mMockConnectivityMgr.getLinkProperties(eq(fakeNetwork))).thenReturn(fakeLp);
+        return fakeNetwork;
+    }
+
+    @Test
+    public void testSetNetworkForTunnelInterface() throws Exception {
+        final IpSecTunnelInterfaceResponse createTunnelResp =
+                createAndValidateTunnel(mSourceAddr, mDestinationAddr, BLESSED_PACKAGE);
+        final Network newFakeNetwork = createFakeUnderlyingNetwork("newFakeNetworkInterface");
+        final int tunnelIfaceResourceId = createTunnelResp.resourceId;
+        mIpSecService.setNetworkForTunnelInterface(
+                tunnelIfaceResourceId, newFakeNetwork, BLESSED_PACKAGE);
+
+        final IpSecService.UserRecord userRecord =
+                mIpSecService.mUserResourceTracker.getUserRecord(mUid);
+        assertEquals(1, userRecord.mTunnelQuotaTracker.mCurrent);
+
+        final TunnelInterfaceRecord tunnelInterfaceInfo =
+                userRecord.mTunnelInterfaceRecords.getResourceOrThrow(tunnelIfaceResourceId);
+        assertEquals(newFakeNetwork, tunnelInterfaceInfo.getUnderlyingNetwork());
+    }
+
+    @Test
+    public void testSetNetworkForTunnelInterfaceFailsForInvalidResourceId() throws Exception {
+        final IpSecTunnelInterfaceResponse createTunnelResp =
+                createAndValidateTunnel(mSourceAddr, mDestinationAddr, BLESSED_PACKAGE);
+        final Network newFakeNetwork = new Network(1000);
+
+        try {
+            mIpSecService.setNetworkForTunnelInterface(
+                    IpSecManager.INVALID_RESOURCE_ID, newFakeNetwork, BLESSED_PACKAGE);
+            fail("Expected an IllegalArgumentException for invalid resource ID.");
+        } catch (IllegalArgumentException expected) {
+        }
+    }
+
+    @Test
+    public void testSetNetworkForTunnelInterfaceFailsWhenSettingTunnelNetwork() throws Exception {
+        final IpSecTunnelInterfaceResponse createTunnelResp =
+                createAndValidateTunnel(mSourceAddr, mDestinationAddr, BLESSED_PACKAGE);
+        final int tunnelIfaceResourceId = createTunnelResp.resourceId;
+        final IpSecService.UserRecord userRecord =
+                mIpSecService.mUserResourceTracker.getUserRecord(mUid);
+        final TunnelInterfaceRecord tunnelInterfaceInfo =
+                userRecord.mTunnelInterfaceRecords.getResourceOrThrow(tunnelIfaceResourceId);
+
+        final Network newFakeNetwork =
+                createFakeUnderlyingNetwork(tunnelInterfaceInfo.getInterfaceName());
+
+        try {
+            mIpSecService.setNetworkForTunnelInterface(
+                    tunnelIfaceResourceId, newFakeNetwork, BLESSED_PACKAGE);
+            fail(
+                    "Expected an IllegalArgumentException because the underlying network is the"
+                            + " network being exposed by this tunnel.");
+        } catch (IllegalArgumentException expected) {
+        }
+    }
+
     @Test
     public void testTunnelInterfaceBinderDeath() throws Exception {
         IpSecTunnelInterfaceResponse createTunnelResp =
-                createAndValidateTunnel(mSourceAddr, mDestinationAddr, "blessedPackage");
+                createAndValidateTunnel(mSourceAddr, mDestinationAddr, BLESSED_PACKAGE);
 
         IpSecService.UserRecord userRecord = mIpSecService.mUserResourceTracker.getUserRecord(mUid);
         IpSecService.RefcountedResource refcountedRecord =
@@ -718,9 +800,9 @@ public class IpSecServiceParameterizedTest {
         addAuthAndCryptToIpSecConfig(ipSecConfig);
 
         IpSecTransformResponse createTransformResp =
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
         IpSecTunnelInterfaceResponse createTunnelResp =
-                createAndValidateTunnel(mSourceAddr, mDestinationAddr, "blessedPackage");
+                createAndValidateTunnel(mSourceAddr, mDestinationAddr, BLESSED_PACKAGE);
 
         if (closeSpiBeforeApply) {
             mIpSecService.releaseSecurityParameterIndex(ipSecConfig.getSpiResourceId());
@@ -728,8 +810,8 @@ public class IpSecServiceParameterizedTest {
 
         int transformResourceId = createTransformResp.resourceId;
         int tunnelResourceId = createTunnelResp.resourceId;
-        mIpSecService.applyTunnelModeTransform(tunnelResourceId, IpSecManager.DIRECTION_OUT,
-                transformResourceId, "blessedPackage");
+        mIpSecService.applyTunnelModeTransform(
+                tunnelResourceId, IpSecManager.DIRECTION_OUT, transformResourceId, BLESSED_PACKAGE);
 
         for (int selAddrFamily : ADDRESS_FAMILIES) {
             verify(mMockNetd)
@@ -758,17 +840,17 @@ public class IpSecServiceParameterizedTest {
         addAuthAndCryptToIpSecConfig(ipSecConfig);
 
         IpSecTransformResponse createTransformResp =
-                mIpSecService.createTransform(ipSecConfig, new Binder(), "blessedPackage");
+                mIpSecService.createTransform(ipSecConfig, new Binder(), BLESSED_PACKAGE);
         IpSecTunnelInterfaceResponse createTunnelResp =
-                createAndValidateTunnel(mSourceAddr, mDestinationAddr, "blessedPackage");
+                createAndValidateTunnel(mSourceAddr, mDestinationAddr, BLESSED_PACKAGE);
 
         // Close SPI record
         mIpSecService.releaseSecurityParameterIndex(ipSecConfig.getSpiResourceId());
 
         int transformResourceId = createTransformResp.resourceId;
         int tunnelResourceId = createTunnelResp.resourceId;
-        mIpSecService.applyTunnelModeTransform(tunnelResourceId, IpSecManager.DIRECTION_OUT,
-                transformResourceId, "blessedPackage");
+        mIpSecService.applyTunnelModeTransform(
+                tunnelResourceId, IpSecManager.DIRECTION_OUT, transformResourceId, BLESSED_PACKAGE);
 
         for (int selAddrFamily : ADDRESS_FAMILIES) {
             verify(mMockNetd)
@@ -790,7 +872,7 @@ public class IpSecServiceParameterizedTest {
 
     @Test
     public void testAddRemoveAddressFromTunnelInterface() throws Exception {
-        for (String pkgName : new String[]{"blessedPackage", "systemPackage"}) {
+        for (String pkgName : new String[] {BLESSED_PACKAGE, SYSTEM_PACKAGE}) {
             IpSecTunnelInterfaceResponse createTunnelResp =
                     createAndValidateTunnel(mSourceAddr, mDestinationAddr, pkgName);
             mIpSecService.addAddressToTunnelInterface(
@@ -816,7 +898,7 @@ public class IpSecServiceParameterizedTest {
     public void testAddTunnelFailsForBadPackageName() throws Exception {
         try {
             IpSecTunnelInterfaceResponse createTunnelResp =
-                    createAndValidateTunnel(mSourceAddr, mDestinationAddr, "badPackage");
+                    createAndValidateTunnel(mSourceAddr, mDestinationAddr, BAD_PACKAGE);
             fail("Expected a SecurityException for badPackage.");
         } catch (SecurityException expected) {
         }
@@ -830,7 +912,7 @@ public class IpSecServiceParameterizedTest {
         try {
             String addr = Inet4Address.getLoopbackAddress().getHostAddress();
             mIpSecService.createTunnelInterface(
-                    addr, addr, new Network(0), new Binder(), "blessedPackage");
+                    addr, addr, new Network(0), new Binder(), BLESSED_PACKAGE);
             fail("Expected UnsupportedOperationException for disabled feature");
         } catch (UnsupportedOperationException expected) {
         }