HC2VPP-322: ensure at most one nat64-prefix is configured per NAT instance

Change-Id: Ic52b386475836e8f1a749cccaafe3bb4e192d0b7
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

3 files changed, 84 insertions, 2 deletions

diff --git a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/Nat64PrefixesCustomizer.java b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/Nat64PrefixesCustomizer.java
index 33dad0d1b..438adae91 100644
--- a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/Nat64PrefixesCustomizer.java
+++ b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/Nat64PrefixesCustomizer.java
@@ -57,8 +57,6 @@ final class Nat64PrefixesCustomizer
         final int natInstanceId = id.firstKeyOf(Instance.class).getId().intValue();
         LOG.debug("Configuring nat64 prefix: {} for nat-instance(vrf): {}", dataAfter, natInstanceId);
 
-        // TODO(HC2VPP-320): ensure at most one prefix is configured per NAT instance
-
         // VPP does not support configuring different nat64-prefixes depending on ipv4 destination prefix:
         final List<DestinationIpv4Prefix> destinationIpv4PrefixList = dataAfter.getDestinationIpv4Prefix();
         checkArgument(destinationIpv4PrefixList == null || destinationIpv4PrefixList.isEmpty(),
diff --git a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/PolicyCustomizer.java b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/PolicyCustomizer.java
index ecc340f38..43f529042 100644
--- a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/PolicyCustomizer.java
+++ b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/PolicyCustomizer.java
@@ -44,6 +44,11 @@ final class PolicyCustomizer implements ListWriterCustomizer<Policy, PolicyKey>
         final Long policyId = id.firstKeyOf(Policy.class).getId();
         checkArgument(policyId == 0,
             "Only single policy per NAT instance (VRF) is supported (expected id=0, but %s given)", policyId);
+
+        if (dataAfter.getNat64Prefixes() != null) {
+            final int prefixCount = dataAfter.getNat64Prefixes().size();
+            checkArgument(prefixCount <= 1, "Only single nat64-prefix is supported, but %s given", prefixCount);
+        }
     }
 
     @Override
diff --git a/nat/nat2vpp/src/test/java/io/fd/hc2vpp/nat/write/PolicyCustomizerTest.java b/nat/nat2vpp/src/test/java/io/fd/hc2vpp/nat/write/PolicyCustomizerTest.java
new file mode 100644
index 000000000..cde2c31f0
--- /dev/null
+++ b/nat/nat2vpp/src/test/java/io/fd/hc2vpp/nat/write/PolicyCustomizerTest.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.hc2vpp.nat.write;
+
+import static io.fd.hc2vpp.nat.NatIds.NAT_INSTANCES_ID;
+import static org.mockito.Mockito.mock;
+
+import io.fd.hc2vpp.common.test.write.WriterCustomizerTest;
+import io.fd.honeycomb.translate.write.WriteFailedException;
+import java.util.Arrays;
+import java.util.Collections;
+import org.junit.Test;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Prefix;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180223.nat.instances.Instance;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180223.nat.instances.InstanceKey;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180223.nat.instances.instance.Policy;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180223.nat.instances.instance.PolicyBuilder;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180223.nat.instances.instance.PolicyKey;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180223.nat.instances.instance.policy.Nat64Prefixes;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180223.nat.instances.instance.policy.Nat64PrefixesBuilder;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public class PolicyCustomizerTest extends WriterCustomizerTest {
+
+    private static final long VRF_ID = 123;
+    private static final InstanceIdentifier<Instance> NAT_INSTANCE_ID =
+        NAT_INSTANCES_ID.child(Instance.class, new InstanceKey(VRF_ID));
+    private static final InstanceIdentifier<Policy> INVALID_POLICY_ID =
+        NAT_INSTANCE_ID.child(Policy.class, new PolicyKey(1L));
+    private static final InstanceIdentifier<Policy> DEFAULT_POLICY_ID =
+        NAT_INSTANCE_ID.child(Policy.class, new PolicyKey(0L));
+    private static final Nat64Prefixes P1 =
+        new Nat64PrefixesBuilder().setNat64Prefix(new Ipv6Prefix("2001:db8::1/32")).build();
+    private static final Nat64Prefixes P2 =
+        new Nat64PrefixesBuilder().setNat64Prefix(new Ipv6Prefix("2001:db8::2/32")).build();
+
+    private PolicyCustomizer customizer;
+
+    @Override
+    protected void setUpTest() throws Exception {
+        customizer = new PolicyCustomizer();
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidPolicyId() throws WriteFailedException {
+        customizer.writeCurrentAttributes(INVALID_POLICY_ID, mock(Policy.class), writeContext);
+    }
+
+    @Test
+    public void testNoNat64Prefixes() throws WriteFailedException {
+        customizer.writeCurrentAttributes(DEFAULT_POLICY_ID, mock(Policy.class), writeContext);
+    }
+
+    @Test
+    public void testSingleNat64Prefix() throws WriteFailedException {
+        final Policy policy = new PolicyBuilder().setNat64Prefixes(Collections.singletonList(P1)).build();
+        customizer.writeCurrentAttributes(DEFAULT_POLICY_ID, policy, writeContext);
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void testTwoNat64Prefixes() throws WriteFailedException {
+        final Policy policy = new PolicyBuilder().setNat64Prefixes(Arrays.asList(P1, P2)).build();
+        customizer.writeCurrentAttributes(DEFAULT_POLICY_ID, policy, writeContext);
+    }
+}
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