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 static java.util.Objects.requireNonNull;
  11 import static org.opendaylight.bgp.concepts.RouteDistinguisherUtil.extractRouteDistinguisher;
  12
  13 import io.netty.buffer.ByteBuf;
  14 import java.util.ArrayList;
  15 import java.util.List;
  16 import org.opendaylight.bgp.concepts.RouteDistinguisherUtil;
  17 import org.opendaylight.protocol.bgp.flowspec.AbstractFlowspecNlriParser;
  18 import org.opendaylight.protocol.bgp.flowspec.SimpleFlowspecTypeRegistry;
  19 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev171207.flowspec.destination.Flowspec;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev171207.flowspec.destination.FlowspecBuilder;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.RouteDistinguisher;
  23 import org.opendaylight.yangtools.yang.common.QName;
  24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  25 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
  26 import org.slf4j.Logger;
  27 import org.slf4j.LoggerFactory;
  28
  29 public abstract class AbstractFlowspecL3vpnNlriParser extends AbstractFlowspecNlriParser {
  30     private static final Logger LOG = LoggerFactory.getLogger(AbstractFlowspecL3vpnNlriParser.class);
  31     public static final NodeIdentifier RD_NID = new NodeIdentifier(QName.create(Flowspec.QNAME.getNamespace(), Flowspec.QNAME.getRevision(), "route-distinguisher"));
  32
  33     protected AbstractFlowspecL3vpnNlriParser(final SimpleFlowspecTypeRegistry flowspecTypeRegistry) {
  34         super(flowspecTypeRegistry);
  35     }
  36
  37     @Override
  38     public String stringNlri(final DataContainerNode<?> flowspec) {
  39         final StringBuilder buffer = new StringBuilder();
  40         final RouteDistinguisher rd = extractRouteDistinguisher(flowspec, RD_NID);
  41         if (rd != null) {
  42             buffer.append("[l3vpn with route-distinguisher ").append(rd.getValue()).append("] ");
  43         }
  44         buffer.append(super.stringNlri(flowspec));
  45         return buffer.toString();
  46     }
  47
  48     /**
  49      * For flowspec-l3vpn, there is a route distinguisher field at the beginning of NLRI (8 bytes)
  50      *
  51      * @param nlri
  52      * @return
  53      */
  54     private static RouteDistinguisher readRouteDistinguisher(final ByteBuf nlri) {
  55         final RouteDistinguisher rd = RouteDistinguisherUtil.parseRouteDistinguisher(nlri);
  56         LOG.trace("Route Distinguisher read from NLRI: {}", rd);
  57         return rd;
  58     }
  59
  60     @Override
  61     protected void serializeNlri(final Object[] nlriFields, final ByteBuf buffer) {
  62         final RouteDistinguisher rd = requireNonNull((RouteDistinguisher) nlriFields[0]);
  63         RouteDistinguisherUtil.serializeRouteDistinquisher(rd, buffer);
  64         final List<Flowspec> flowspecList = (List<Flowspec>) nlriFields[1];
  65         serializeNlri(flowspecList, buffer);
  66     }
  67
  68     @Override
  69     protected Object[] parseNlri(final ByteBuf nlri) throws BGPParsingException {
  70         readNlriLength(nlri);
  71         return new Object[] {
  72             requireNonNull(readRouteDistinguisher(nlri)),
  73             parseL3vpnNlriFlowspecList(nlri)
  74         };
  75     }
  76
  77     protected final List<Flowspec> parseL3vpnNlriFlowspecList(final ByteBuf nlri) throws BGPParsingException {
  78         if (!nlri.isReadable()) {
  79             return null;
  80         }
  81         final List<Flowspec> fss = new ArrayList<>();
  82
  83         while (nlri.isReadable()) {
  84             final FlowspecBuilder builder = new FlowspecBuilder();
  85             builder.setFlowspecType(this.flowspecTypeRegistry.parseFlowspecType(nlri));
  86             fss.add(builder.build());
  87         }
  88
  89         return fss;
  90     }
  91 }
  92