HC2VPP-105: nat64 prefix configuration

Change-Id: I205fb426ab9c0e47ef40b81c2f6dcd397524f1eb
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>
Signed-off-by: Jan Srnicek <jsrnicek@cisco.com>

2 files changed, 113 insertions, 0 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
new file mode 100644
index 000000000..b62733e75
--- /dev/null
+++ b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/Nat64PrefixesCustomizer.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2017 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 static com.google.common.base.Preconditions.checkNotNull;
+
+import io.fd.hc2vpp.common.translate.util.ByteDataTranslator;
+import io.fd.hc2vpp.common.translate.util.Ipv6Translator;
+import io.fd.hc2vpp.common.translate.util.JvppReplyConsumer;
+import io.fd.honeycomb.translate.spi.write.ListWriterCustomizer;
+import io.fd.honeycomb.translate.write.WriteContext;
+import io.fd.honeycomb.translate.write.WriteFailedException;
+import io.fd.vpp.jvpp.nat.dto.Nat64AddDelPrefix;
+import io.fd.vpp.jvpp.nat.future.FutureJVppNatFacade;
+import java.util.List;
+import javax.annotation.Nonnull;
+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.rev150908.nat.config.nat.instances.NatInstance;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.parameters.Nat64Prefixes;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.parameters.Nat64PrefixesKey;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.parameters.nat64.prefixes.DestinationIpv4Prefix;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+final class Nat64PrefixesCustomizer
+        implements ListWriterCustomizer<Nat64Prefixes, Nat64PrefixesKey>, ByteDataTranslator, Ipv6Translator,
+        JvppReplyConsumer {
+
+    private static final Logger LOG = LoggerFactory.getLogger(Nat64PrefixesCustomizer.class);
+
+    private final FutureJVppNatFacade jvppNat;
+
+    Nat64PrefixesCustomizer(final FutureJVppNatFacade jvppNat) {
+        this.jvppNat = checkNotNull(jvppNat, "jvppNat should not be null");
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull final InstanceIdentifier<Nat64Prefixes> id,
+                                       @Nonnull final Nat64Prefixes dataAfter,
+                                       @Nonnull final WriteContext writeContext) throws WriteFailedException {
+        final int natInstanceId = id.firstKeyOf(NatInstance.class).getId().intValue();
+        LOG.debug("Configuring nat64 prefix: {} for nat-instance(vrf): {}", dataAfter, natInstanceId);
+
+        // VPP supports only single nat64-prefix per VRF/nat-instance (we map nat-instances to VRFs)
+        // To ensure that (and for simplicity), we require nat64-prefix-id = 0.
+        final Long nat64PrefixId = id.firstKeyOf(Nat64Prefixes.class).getNat64PrefixId();
+        checkArgument(nat64PrefixId == 0, "Only single nat64 prefix is supported (expected id=0, but %s given)",
+                nat64PrefixId);
+
+        // VPP does not support configuring different nat64-prefixes depending on ipv4 destination prefix:
+        final List<DestinationIpv4Prefix> destinationIpv4PrefixList = dataAfter.getDestinationIpv4Prefix();
+        checkArgument(destinationIpv4PrefixList == null || destinationIpv4PrefixList.isEmpty(),
+                "destination-ipv4-prefix is not supported by VPP");
+
+        addDelPrefix(id, dataAfter, natInstanceId, true);
+        LOG.debug("Nat64 prefix written successfully: {} for nat-instance(vrf): {}", dataAfter, natInstanceId);
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<Nat64Prefixes> id,
+                                        @Nonnull final Nat64Prefixes dataBefore,
+                                        @Nonnull final WriteContext writeContext)
+            throws WriteFailedException {
+        final int natInstanceId = id.firstKeyOf(NatInstance.class).getId().intValue();
+        LOG.debug("Removing nat64 prefix configuration: {} for nat-instance(vrf): {}", dataBefore, natInstanceId);
+        // No need for validation here (it was done on write)
+        addDelPrefix(id, dataBefore, natInstanceId, false);
+        LOG.debug("Nat64 prefix removed successfully: {} for nat-instance(vrf): {}", dataBefore, natInstanceId);
+
+    }
+
+    private void addDelPrefix(@Nonnull final InstanceIdentifier<Nat64Prefixes> id, @Nonnull final Nat64Prefixes data,
+                              final int vrfId, final boolean isAdd)
+            throws WriteFailedException {
+
+        // The nat64-prefix is optional in ietf-nat, but we require it
+        final Ipv6Prefix nat64Prefix = data.getNat64Prefix();
+        checkArgument(nat64Prefix != null, "Missing nat64-prefix leaf value.");
+
+        final Nat64AddDelPrefix request = new Nat64AddDelPrefix();
+        request.prefix = ipv6AddressPrefixToArray(nat64Prefix);
+        request.prefixLen = extractPrefix(nat64Prefix);
+        request.isAdd = booleanToByte(isAdd);
+        request.vrfId = vrfId;
+        getReplyForWrite(jvppNat.nat64AddDelPrefix(request).toCompletableFuture(), id);
+    }
+}
diff --git a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/NatWriterFactory.java b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/NatWriterFactory.java
index e315da637..764da68b8 100644
--- a/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/NatWriterFactory.java
+++ b/nat/nat2vpp/src/main/java/io/fd/hc2vpp/nat/write/NatWriterFactory.java
@@ -32,6 +32,8 @@ import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev1509
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.config.nat.instances.nat.instance.MappingTable;
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.config.nat.instances.nat.instance.mapping.table.MappingEntry;
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.parameters.ExternalIpAddressPool;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.parameters.Nat64Prefixes;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.nat.rev150908.nat.parameters.nat64.prefixes.DestinationIpv4Prefix;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.nat.rev170804.ExternalIpAddressPoolConfigAugmentation;
 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 
@@ -45,6 +47,8 @@ public final class NatWriterFactory implements WriterFactory {
             NAT_CFG_ID.child(NatInstances.class).child(NatInstance.class);
     private static final InstanceIdentifier<MappingEntry> MAP_ENTRY_ID =
             NAT_INSTANCE_ID.child(MappingTable.class).child(MappingEntry.class);
+    private static final InstanceIdentifier<Nat64Prefixes> NAT64_PREFIXES =
+            NAT_INSTANCE_ID.child(Nat64Prefixes.class);
 
     private final FutureJVppNatFacade jvppNat;
     private final MappingEntryContext mappingEntryContext;
@@ -73,5 +77,11 @@ public final class NatWriterFactory implements WriterFactory {
                         new GenericListWriter<>(NAT_INSTANCE_ID.child(ExternalIpAddressPool.class),
                 new ExternalIpPoolCustomizer(jvppNat)),
                 MAP_ENTRY_ID);
+
+        // nat64-prefixes
+        registry.subtreeAdd(
+                Sets.newHashSet(InstanceIdentifier.create(Nat64Prefixes.class).child(DestinationIpv4Prefix.class)),
+                new GenericListWriter<>(NAT_INSTANCE_ID.child(Nat64Prefixes.class),
+                        new Nat64PrefixesCustomizer(jvppNat)));
     }
 }