HC2VPP-304 - add SRv6 policy module

new models:
- hc2vpp-oc-srte-policy@2017-09-18.yang
  (ietf draft for srte-policies)
- vpp-oc-srte-policy@2018-05-14.yang
  (augments oc-srte-policy model with VPP specific configuration)
- policy-context@2018-06-07.yang
  defines policy contexts for policies and candidate paths

new features:
- adds support for writing/reading SRv6 policies
- adds support for writing/reading L2 steering
- adds support for writing/reading L3 steering
- implements support for FIB table management (HC2VPP-345)

Change-Id: Ie83ac8ecdcc0e46086e1ecdaecbb811746151c2f
Signed-off-by: Michal Cmarada <michal.cmarada@pantheon.tech>

7 files changed, 496 insertions, 0 deletions

diff --git a/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/CandidatePathContextManager.java b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/CandidatePathContextManager.java
new file mode 100644
index 000000000..d0b6479be
--- /dev/null
+++ b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/CandidatePathContextManager.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2018 Bell Canada, Pantheon Technologies 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.srv6.util;
+
+import io.fd.honeycomb.translate.MappingContext;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.ProvisioningMethodType;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.candidate.path.context.attributes.srv6.candidate.path.mappings.Srv6CandidatePathMapping;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
+
+/**
+ * Manages metadata for SRv6 policy plugin
+ */
+public interface CandidatePathContextManager {
+    /**
+     * Creates metadata for candidate path. Existing mapping is overwritten if exists.
+     *
+     * @param bsid               candidate path bsid
+     * @param name               candidate path name
+     * @param provisioningMethod candidate path provisioning method
+     * @param preference         candidate path preference
+     * @param distinguisher      candidate path distinguisher
+     * @param ctx                mapping context providing context data for current transaction
+     */
+    void addCandidatePath(@Nonnull Ipv6Address bsid, @Nonnull final String name,
+                          @Nonnull final Class<? extends ProvisioningMethodType> provisioningMethod,
+                          @Nonnull Long preference, @Nonnull Long distinguisher, @Nonnull final MappingContext ctx);
+
+    /**
+     * Retrieves candidate path for given name. If not present it will generate artificial mapping
+     *
+     * @param bsid candidate path BSID
+     * @param ctx  mapping context providing context data for current transaction
+     * @return candidate path matching supplied candidate path BSID if present, artificial mapping otherwise
+     */
+    @Nonnull
+    Srv6CandidatePathMapping getCandidatePath(@Nonnull final Ipv6Address bsid, @Nonnull final MappingContext ctx);
+
+    /**
+     * Removes candidate path metadata from current context.
+     *
+     * @param bsid candidate path BSID
+     * @param ctx  mapping context providing context data for current transaction
+     */
+    void removeCandidatePath(@Nonnull final Ipv6Address bsid, @Nonnull final MappingContext ctx);
+
+}
diff --git a/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/CandidatePathContextManagerImpl.java b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/CandidatePathContextManagerImpl.java
new file mode 100644
index 000000000..15fb5c0ff
--- /dev/null
+++ b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/CandidatePathContextManagerImpl.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2018 Bell Canada, Pantheon Technologies 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.srv6.util;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.translate.MappingContext;
+import java.util.concurrent.atomic.AtomicLong;
+import javax.annotation.Nonnull;
+import javax.annotation.concurrent.ThreadSafe;
+import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.ProvisioningMethodConfig;
+import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.ProvisioningMethodType;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.Contexts;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.Srv6PolicyContextAugmentation;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.candidate.path.context.attributes.Srv6CandidatePathMappings;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.candidate.path.context.attributes.srv6.candidate.path.mappings.Srv6CandidatePathMapping;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.candidate.path.context.attributes.srv6.candidate.path.mappings.Srv6CandidatePathMappingBuilder;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.candidate.path.context.attributes.srv6.candidate.path.mappings.Srv6CandidatePathMappingKey;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
+
+/**
+ * Facade on top of {@link MappingContext} that manages {@link Srv6CandidatePathMappings}.
+ */
+@ThreadSafe
+public class CandidatePathContextManagerImpl implements CandidatePathContextManager {
+
+    private static final long DEFAULT_PREFERENCE = 100L;
+    private AtomicLong distinguisher;
+
+    private final InstanceIdentifier<Srv6CandidatePathMappings> ctxIid;
+
+    public CandidatePathContextManagerImpl() {
+        this.ctxIid = InstanceIdentifier.create(Contexts.class)
+                .augmentation(Srv6PolicyContextAugmentation.class)
+                .child(Srv6CandidatePathMappings.class);
+        distinguisher = new AtomicLong(0L);
+    }
+
+    @Override
+    public void addCandidatePath(@Nonnull Ipv6Address bsid, @Nonnull final String name,
+                                 @Nonnull final Class<? extends ProvisioningMethodType> provisioningMethod,
+                                 @Nonnull Long preference, @Nonnull Long distinguisher,
+                                 @Nonnull final MappingContext ctx) {
+        final KeyedInstanceIdentifier<Srv6CandidatePathMapping, Srv6CandidatePathMappingKey> mappingIid =
+                getCandidatePathIid(bsid);
+        final Srv6CandidatePathMappingBuilder builder =
+                new Srv6CandidatePathMappingBuilder().setKey(new Srv6CandidatePathMappingKey(bsid))
+                        .setProvisioningMethod(provisioningMethod).setPreference(preference)
+                        .setDistinguisher(distinguisher).setBsid(bsid).setName(name);
+        ctx.put(mappingIid, builder.build());
+    }
+
+    private KeyedInstanceIdentifier<Srv6CandidatePathMapping, Srv6CandidatePathMappingKey> getCandidatePathIid(
+            final Ipv6Address bsid) {
+        return ctxIid.child(Srv6CandidatePathMapping.class, new Srv6CandidatePathMappingKey(bsid));
+    }
+
+    @Override
+    @Nonnull
+    public synchronized Srv6CandidatePathMapping getCandidatePath(@Nonnull final Ipv6Address bsid,
+                                                                  @Nonnull final MappingContext ctx) {
+        final Optional<Srv6CandidatePathMappings> read = ctx.read(ctxIid);
+        if (read.isPresent()) {
+            java.util.Optional<Srv6CandidatePathMapping> mappingOpt = read.get().getSrv6CandidatePathMapping().stream()
+                    .filter(srv6CandidatePathMapping -> srv6CandidatePathMapping.getBsid().getValue()
+                            .equals(bsid.getValue())).findAny();
+            if (mappingOpt.isPresent()) {
+                return mappingOpt.get();
+            }
+        }
+        return getArtificialMapping(bsid, ctx, bsid.getValue());
+    }
+
+    private Srv6CandidatePathMapping getArtificialMapping(final @Nonnull Ipv6Address bsid,
+                                                          final @Nonnull MappingContext ctx, final String name) {
+        // if not present we need to generate artificial mapping
+        // for given policy only one candidate path can be selected and be configured on the device.
+        Srv6CandidatePathMapping mapping =
+                new Srv6CandidatePathMappingBuilder()
+                        .setProvisioningMethod(ProvisioningMethodConfig.class)
+                        .setBsid(bsid) //when we read name from VPP it is always the BSID value
+                        .setPreference(DEFAULT_PREFERENCE)
+                        .setDistinguisher(distinguisher.incrementAndGet())
+                        .build();
+        addCandidatePath(mapping.getBsid(), name, mapping.getProvisioningMethod(), mapping.getPreference(),
+                mapping.getDistinguisher(), ctx);
+        return mapping;
+    }
+
+    @Override
+    public void removeCandidatePath(@Nonnull final Ipv6Address bsid, @Nonnull final MappingContext ctx) {
+        final KeyedInstanceIdentifier<Srv6CandidatePathMapping, Srv6CandidatePathMappingKey> mappingIid =
+                getCandidatePathIid(bsid);
+        ctx.delete(mappingIid);
+    }
+}
diff --git a/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/NoopCustomizer.java b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/NoopCustomizer.java
new file mode 100644
index 000000000..dd0f2615e
--- /dev/null
+++ b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/NoopCustomizer.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2018 Bell Canada, Pantheon Technologies 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.srv6.util;
+
+import io.fd.honeycomb.translate.spi.write.WriterCustomizer;
+import io.fd.honeycomb.translate.write.WriteContext;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class NoopCustomizer<T extends DataObject> implements WriterCustomizer<T> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(NoopCustomizer.class);
+
+    public NoopCustomizer() {
+        super();
+    }
+
+    @Override
+    public void writeCurrentAttributes(@Nonnull InstanceIdentifier<T> instanceIdentifier, @Nonnull T data,
+                                       @Nonnull WriteContext writeContext) {
+        LOG.trace("Noop write called for IId: {}, data: {}", instanceIdentifier, data);
+    }
+
+    @Override
+    public void deleteCurrentAttributes(@Nonnull InstanceIdentifier<T> instanceIdentifier, @Nonnull T data,
+                                        @Nonnull WriteContext writeContext) {
+        LOG.trace("Noop delete called for IId: {}, data: {}", instanceIdentifier, data);
+    }
+}
diff --git a/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/PolicyContextManager.java b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/PolicyContextManager.java
new file mode 100644
index 000000000..3a07fe024
--- /dev/null
+++ b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/PolicyContextManager.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2018 Bell Canada, Pantheon Technologies 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.srv6.util;
+
+import io.fd.honeycomb.translate.MappingContext;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.policy.context.attributes.srv6.policy.mappings.Srv6PolicyMapping;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
+
+/**
+ * Manages metadata for SRv6 policy plugin
+ */
+public interface PolicyContextManager {
+    /**
+     * Creates metadata for policy. Existing mapping is overwritten if exists.
+     *
+     * @param name     policy name
+     * @param color    policy color
+     * @param endpoint policy endpoint
+     * @param bsid     policy bsid
+     * @param ctx      mapping context providing context data for current transaction
+     */
+    void addPolicy(@Nonnull final String name, @Nonnull Long color, @Nonnull Ipv6Address endpoint,
+                   @Nonnull Ipv6Address bsid, @Nonnull final MappingContext ctx);
+
+    /**
+     * Retrieves policy for given policy BSID. If not present it wil generate artificial mapping
+     *
+     * @param bsid policy BSID
+     * @param ctx  mapping context providing context data for current transaction
+     * @return policy matching supplied policy BSID if present, or artificial mapping if not
+     */
+    @Nonnull
+    Srv6PolicyMapping getPolicy(@Nonnull final Ipv6Address bsid, @Nonnull final MappingContext ctx);
+
+    /**
+     * Retrieves policy BSID for given policy color and endpoint.
+     *
+     * @param color policy color
+     * @param endpoint policy endpoint
+     * @param ctx  mapping context providing context data for current transaction
+     * @return policy BSID matching supplied policy color and endpoint if present, null otherwise
+     */
+    Ipv6Address getPolicyBsid(@Nonnull Long color, @Nonnull Ipv6Address endpoint, @Nonnull final MappingContext ctx);
+
+    /**
+     * Removes policy metadata from current context.
+     *
+     * @param bsid policy BSID
+     * @param ctx  mapping context providing context data for current transaction
+     */
+    void removePolicy(@Nonnull final Ipv6Address bsid, @Nonnull final MappingContext ctx);
+
+}
diff --git a/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/PolicyContextManagerImpl.java b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/PolicyContextManagerImpl.java
new file mode 100644
index 000000000..1997043e2
--- /dev/null
+++ b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/PolicyContextManagerImpl.java
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2018 Bell Canada, Pantheon Technologies 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.srv6.util;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.translate.MappingContext;
+import javax.annotation.Nonnull;
+import javax.annotation.concurrent.ThreadSafe;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.naming.context.rev160513.Contexts;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.Srv6PolicyContextAugmentation;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.policy.context.attributes.Srv6PolicyMappings;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.policy.context.attributes.srv6.policy.mappings.Srv6PolicyMapping;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.policy.context.attributes.srv6.policy.mappings.Srv6PolicyMappingBuilder;
+import org.opendaylight.yang.gen.v1.urn.honeycomb.params.xml.ns.yang.policy.context.rev180607.srv6.policy.context.attributes.srv6.policy.mappings.Srv6PolicyMappingKey;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
+
+/**
+ * Facade on top of {@link MappingContext} that manages {@link Srv6PolicyMappings}.
+ */
+@ThreadSafe
+public class PolicyContextManagerImpl implements PolicyContextManager {
+
+    private final InstanceIdentifier<Srv6PolicyMappings> ctxIid;
+    // 2001:db8::/32 This address range is used for documentation and example source code. We can use it as dummy
+    // addresses for our artificial policies
+    private static final String DUMMY_EP = "2001:db8::";
+    private Long artificialColor;
+
+    public PolicyContextManagerImpl() {
+        this.ctxIid = InstanceIdentifier.create(Contexts.class)
+                .augmentation(Srv6PolicyContextAugmentation.class)
+                .child(Srv6PolicyMappings.class);
+        this.artificialColor = 0L;
+    }
+
+    @Override
+    public void addPolicy(@Nonnull final String name, @Nonnull final Long color, @Nonnull final Ipv6Address endpoint,
+                          @Nonnull final Ipv6Address bsid, @Nonnull final MappingContext ctx) {
+        final KeyedInstanceIdentifier<Srv6PolicyMapping, Srv6PolicyMappingKey> mappingIid = getPolicyIid(bsid);
+        final Srv6PolicyMappingBuilder builder =
+                new Srv6PolicyMappingBuilder().setKey(new Srv6PolicyMappingKey(bsid)).setColor(color)
+                        .setEndpoint(endpoint).setBsid(bsid).setName(name);
+        ctx.put(mappingIid, builder.build());
+    }
+
+    private KeyedInstanceIdentifier<Srv6PolicyMapping, Srv6PolicyMappingKey> getPolicyIid(final Ipv6Address bsid) {
+        return ctxIid.child(Srv6PolicyMapping.class, new Srv6PolicyMappingKey(bsid));
+    }
+
+    @Nonnull
+    public synchronized Srv6PolicyMapping getPolicy(@Nonnull final Ipv6Address bsid,
+                                                    @Nonnull final MappingContext ctx) {
+        final Optional<Srv6PolicyMapping> read = ctx.read(getPolicyIid(bsid));
+        if (read.isPresent()) {
+            return read.get();
+        }
+
+        //if not present we need to generate artificial mapping
+        Long nextArtificialColor = getNextArtificialColor();
+        Ipv6Address endpoint = new Ipv6Address(DUMMY_EP + nextArtificialColor);
+        Srv6PolicyMapping mapping =
+                new Srv6PolicyMappingBuilder().setBsid(bsid).setColor(nextArtificialColor).setEndpoint(endpoint)
+                        .setName(bsid.getValue()).build();
+        addPolicy(mapping.getName(), mapping.getColor(), mapping.getEndpoint(), mapping.getBsid(), ctx);
+        return mapping;
+    }
+
+    @Override
+    public Ipv6Address getPolicyBsid(@Nonnull Long color, @Nonnull Ipv6Address endpoint,
+                                     @Nonnull final MappingContext ctx) {
+        Optional<Srv6PolicyMappings> read = ctx.read(ctxIid);
+        if (read.isPresent()) {
+            return read.get().getSrv6PolicyMapping().stream()
+                    .filter(srv6PolicyMapping -> srv6PolicyMapping.getColor().equals(color) &&
+                            srv6PolicyMapping.getEndpoint().equals(endpoint))
+                    .map(Srv6PolicyMapping::getBsid).findFirst().orElse(null);
+        }
+        return null;
+    }
+
+    @Override
+    public void removePolicy(@Nonnull final Ipv6Address bsid, @Nonnull final MappingContext ctx) {
+        final KeyedInstanceIdentifier<Srv6PolicyMapping, Srv6PolicyMappingKey> mappingIid = getPolicyIid(bsid);
+        ctx.delete(mappingIid);
+    }
+
+    private synchronized Long getNextArtificialColor() {
+        artificialColor++;
+        return artificialColor;
+    }
+}
diff --git a/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/Srv6Util.java b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/Srv6Util.java
new file mode 100644
index 000000000..ea308efcf
--- /dev/null
+++ b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/Srv6Util.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2018 Bell Canada, Pantheon Technologies 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.srv6.util;
+
+import com.google.common.base.Optional;
+import io.fd.honeycomb.translate.util.RWUtils;
+import io.fd.honeycomb.translate.write.WriteContext;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.DataplaneType;
+import org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.policies.policies.Policy;
+import org.opendaylight.yang.gen.v1.urn.hc2vpp.params.xml.ns.yang.vpp.oc.srte.policy.rev180514.VppSrPolicyAugmentation;
+import org.opendaylight.yang.gen.v1.urn.hc2vpp.params.xml.ns.yang.vpp.oc.srte.policy.rev180514.segment.routing.traffic.engineering.policies.policy.VppSrPolicy;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public final class Srv6Util {
+
+    /**
+     * Constructs unique name for candidate path based on binding sid and weight
+     *
+     * @param bsid   binding sid associated with candidate path
+     * @param weight weight of actual sidList
+     * @return candidate path name
+     */
+    public static String getCandidatePathName(final Ipv6Address bsid, final long weight) {
+        return bsid.getValue() + "-" + weight;
+    }
+
+    /**
+     * Extracts BSID from policy, based on read/write operation it uses dataBefore/dataAfter while reading config
+     *
+     * @param instanceIdentifier identifier used to extract path of policy
+     * @param writeContext       used to store any useful information later utilized by customizers
+     * @param isWrite            condition whether this is a write or delete operation
+     * @return BSID in form of IPv6 address or null if not resolved
+     */
+    public static <T extends DataObject> Ipv6Address extractBsid(
+            final @Nonnull InstanceIdentifier<T> instanceIdentifier, final @Nonnull WriteContext writeContext,
+            boolean isWrite) {
+        Optional<Policy> policyOptional = isWrite
+                ? writeContext.readAfter(RWUtils.cutId(instanceIdentifier, Policy.class))
+                : writeContext.readBefore(RWUtils.cutId(instanceIdentifier, Policy.class));
+
+        if (policyOptional.isPresent() && policyOptional.get().getBindingSid() != null &&
+                policyOptional.get().getBindingSid().getConfig() != null) {
+            org.opendaylight.yang.gen.v1.http.cisco.com.ns.yang.oc.srte.policy.rev170918.binding.sid.properties.binding.sid.Config
+                    config = policyOptional.get().getBindingSid().getConfig();
+            if (config.getType() == DataplaneType.Srv6 && config.getValue() != null &&
+                    config.getValue().getIpAddress() != null &&
+                    config.getValue().getIpAddress().getIpv6Address() != null) {
+                return config.getValue().getIpAddress().getIpv6Address();
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Extracts VRF FIB from Policy.
+     *
+     * @param instanceIdentifier identifier used to extract path of policy
+     * @param writeContext       used to store any useful information later utilized by customizers
+     * @param isWrite            condition whether this is a write or delete operation
+     * @return VRF FIB id when resolved, default VRF FIB (0) otherwise
+     */
+    public static <T extends DataObject> int extractVrfFib(final @Nonnull InstanceIdentifier<T> instanceIdentifier,
+                                                           final @Nonnull WriteContext writeContext, boolean isWrite) {
+        Optional<Policy> policyOptional = isWrite
+                ? writeContext.readAfter(RWUtils.cutId(instanceIdentifier, Policy.class))
+                : writeContext.readBefore(RWUtils.cutId(instanceIdentifier, Policy.class));
+
+        if (policyOptional.isPresent() && policyOptional.get().getAugmentation(VppSrPolicyAugmentation.class) != null &&
+                policyOptional.get().getAugmentation(VppSrPolicyAugmentation.class).getVppSrPolicy() != null) {
+
+            VppSrPolicy vppSrPolicy =
+                    policyOptional.get().getAugmentation(VppSrPolicyAugmentation.class).getVppSrPolicy();
+            if (vppSrPolicy.getConfig() != null && vppSrPolicy.getConfig().getTableId() != null) {
+                return vppSrPolicy.getConfig().getTableId().getValue().intValue();
+            }
+        }
+        // returning default Vrf Fib table
+        return 0;
+    }
+}
diff --git a/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/function/xconnect/EndDX2FunctionBinder.java b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/function/xconnect/EndDX2FunctionBinder.java
index 551a211dd..5321bffcf 100644
--- a/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/function/xconnect/EndDX2FunctionBinder.java
+++ b/srv6/srv6-impl/src/main/java/io/fd/hc2vpp/srv6/util/function/xconnect/EndDX2FunctionBinder.java
@@ -52,6 +52,8 @@ public class EndDX2FunctionBinder extends XConnectFunctionBinder {
                 "Failed to map data: {} for request: {}", data, request);
         request.setOutgoingInterfaceIndex(getInterfaceIndex(ctx.getMappingContext(), outInterface));
         request.setFunction(getBehaviourFunctionType());
+        // TODO (HC2VPP-357): check model for ENDDX2V support, when added we can set the VLAN index
+        // request.setVlanIndex(getVLanIndex(ctx.getMappingContext(), ));
         return request;
     }