HC2VPP-321: bump nat model to ietf-nat@2018-02-23.yang

Uses ietf-nat module as defined in
https://tools.ietf.org/html/draft-ietf-opsawg-nat-yang-14

Modifications to original model:
- ip-address is used instead of ip-prefix
 (draft is not clear, see HC2VPP-325).

API changes relevant to HC/VPP:
- nat-config and nat-state merged into nat container
- nat-instances and nat-instace renamed
  to instances and instance respectively
- external-ip-address-pool has new parent - policy list
- port-type choice was removed, port is now defined using
  start-port-number and end-port-number leaves.
  Missing end is equivalent to single-port-number case from
  the older version.

TODOs:
- HC2VPP-322: single nat64Prefix per NAT instance
- HC2VPP-323: update postman collection
- HC2VPP-324: update CSIT tests.

Out of the scope of NAT model update:
- HC2VPP-326: support for nat-type handling
  (vpp-nat model might become obsolete)
- HC2VPP-327: support external-realm container
  (requires adding augmentations
  that are alredy present in the interface-nat model).

Change-Id: Ie229a55b0a3f6ee3f8c97f4fd13c54a797a62438
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

1 files changed, 55 insertions, 0 deletions

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
new file mode 100644
index 000000000..ecc340f38
--- /dev/null
+++ b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/PolicyCustomizer.java
@@ -0,0 +1,55 @@
+/*
+ * 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 com.google.common.base.Preconditions.checkArgument;
+
+import io.fd.honeycomb.translate.spi.write.ListWriterCustomizer;
+import io.fd.honeycomb.translate.write.WriteContext;
+import io.fd.honeycomb.translate.write.WriteFailedException;
+import javax.annotation.Nonnull;
+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.instance.Policy;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev180223.nat.instances.instance.PolicyKey;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+final class PolicyCustomizer implements ListWriterCustomizer<Policy, PolicyKey> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(PolicyCustomizer.class);
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Policy> id,
+                                       @Nonnull final Policy dataAfter, @Nonnull final WriteContext writeContext)
+            throws WriteFailedException {
+        LOG.trace("Writing NAT policy: {}", id);
+
+        // HC supports only single NAT policy per NAT instance (VRF)
+        // To ensure that (and for simplicity), we require policy id = 0.
+        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);
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Policy> id,
+                                        @Nonnull final Policy dataBefore, @Nonnull final WriteContext writeContext)
+            throws WriteFailedException {
+        LOG.trace("Deleting NAT policy: {}", id);
+    }
+}