bgp/flowspec/src/main/java/org/opendaylight/protocol/bgp/flowspec/l3vpn/AbstractFlowspecL3vpnNlriParser.java

   1 /*
   2  * Copyright (c) 2016 Brocade Communications Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.protocol.bgp.flowspec.l3vpn;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.base.Preconditions;
  12 import io.netty.buffer.ByteBuf;
  13 import java.util.List;
  14 import javax.annotation.Nonnull;
  15 import org.opendaylight.bgp.concepts.RouteDistinguisherUtil;
  16 import org.opendaylight.protocol.bgp.flowspec.AbstractFlowspecNlriParser;
  17 import org.opendaylight.protocol.bgp.flowspec.SimpleFlowspecTypeRegistry;
  18 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.Flowspec;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.RouteDistinguisher;
  21 import org.opendaylight.yangtools.yang.common.QName;
  22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  23 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
  24 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
  25 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
  26 import org.slf4j.Logger;
  27 import org.slf4j.LoggerFactory;
  28
  29 /**
  30  * @author Kevin Wang
  31  */
  32 public abstract class AbstractFlowspecL3vpnNlriParser extends AbstractFlowspecNlriParser {
  33     private static final Logger LOG = LoggerFactory.getLogger(AbstractFlowspecL3vpnNlriParser.class);
  34
  35     private static final NodeIdentifier RD_NID = new NodeIdentifier(QName.create(Flowspec.QNAME.getNamespace(), Flowspec.QNAME.getRevision(), "route-distinguisher"));
  36
  37     protected AbstractFlowspecL3vpnNlriParser(SimpleFlowspecTypeRegistry flowspecTypeRegistry) {
  38         super(flowspecTypeRegistry);
  39     }
  40
  41     @Override
  42     public String stringNlri(final DataContainerNode<?> flowspec) {
  43         final StringBuilder buffer = new StringBuilder();
  44         final RouteDistinguisher rd = extractRouteDistinguisher(flowspec);
  45         if (rd != null) {
  46             buffer.append("[l3vpn with route-distinguisher ").append(rd.getValue()).append("] ");
  47         }
  48         buffer.append(super.stringNlri(flowspec));
  49         return buffer.toString();
  50     }
  51
  52     public static final RouteDistinguisher extractRouteDistinguisher(final DataContainerNode<?> route) {
  53         final Optional<DataContainerChild<? extends PathArgument, ?>> rdNode = route.getChild(RD_NID);
  54         if (rdNode.isPresent()) {
  55             return RouteDistinguisherUtil.parseRouteDistinguisher(rdNode.get().getValue());
  56         }
  57         return null;
  58     }
  59
  60     /**
  61      * For flowspec-l3vpn, there is a route distinguisher field at the beginning of NLRI (8 bytes)
  62      *
  63      * @param nlri
  64      * @return
  65      */
  66     private static final RouteDistinguisher readRouteDistinguisher(final ByteBuf nlri) {
  67         final RouteDistinguisher rd = RouteDistinguisherUtil.parseRouteDistinguisher(nlri);
  68         LOG.trace("Route Distinguisher read from NLRI: {}", rd);
  69         return rd;
  70     }
  71
  72     @Override
  73     protected void serializeNlri(@Nonnull final Object[] nlriFields, @Nonnull final ByteBuf buffer) {
  74         final RouteDistinguisher rd = Preconditions.checkNotNull((RouteDistinguisher) nlriFields[0]);
  75         RouteDistinguisherUtil.serializeRouteDistinquisher(rd, buffer);
  76         final List<Flowspec> flowspecList = (List<Flowspec>) nlriFields[1];
  77         serializeNlri(flowspecList, buffer);
  78     }
  79
  80     @Override
  81     @Nonnull
  82     protected Object[] parseNlri(@Nonnull final ByteBuf nlri) throws BGPParsingException {
  83         return new Object[] {
  84             Preconditions.checkNotNull(readRouteDistinguisher(nlri)),
  85             parseNlriFlowspecList(nlri)
  86         };
  87     }
  88 }
  89