bgp/extensions/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.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev180329.flowspec.destination.Flowspec;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev180329.flowspec.destination.FlowspecBuilder;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev180329.RouteDistinguisher;
  22 import org.opendaylight.yangtools.yang.common.QName;
  23 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  24 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 public abstract class AbstractFlowspecL3vpnNlriParser extends AbstractFlowspecNlriParser {
  29     private static final Logger LOG = LoggerFactory.getLogger(AbstractFlowspecL3vpnNlriParser.class);
  30     public static final NodeIdentifier RD_NID = new NodeIdentifier(QName.create(Flowspec.QNAME.getModule(),
  31             "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     private static RouteDistinguisher readRouteDistinguisher(final ByteBuf nlri) {
  52         final RouteDistinguisher rd = RouteDistinguisherUtil.parseRouteDistinguisher(nlri);
  53         LOG.trace("Route Distinguisher read from NLRI: {}", rd);
  54         return rd;
  55     }
  56
  57     @Override
  58     protected void serializeNlri(final Object[] nlriFields, final ByteBuf buffer) {
  59         final RouteDistinguisher rd = requireNonNull((RouteDistinguisher) nlriFields[0]);
  60         RouteDistinguisherUtil.serializeRouteDistinquisher(rd, buffer);
  61         final List<Flowspec> flowspecList = (List<Flowspec>) nlriFields[1];
  62         serializeNlri(flowspecList, buffer);
  63     }
  64
  65     @Override
  66     protected Object[] parseNlri(final ByteBuf nlri) {
  67         readNlriLength(nlri);
  68         return new Object[] {
  69             requireNonNull(readRouteDistinguisher(nlri)),
  70             parseL3vpnNlriFlowspecList(nlri)
  71         };
  72     }
  73
  74     protected final List<Flowspec> parseL3vpnNlriFlowspecList(final ByteBuf nlri) {
  75         if (!nlri.isReadable()) {
  76             return null;
  77         }
  78         final List<Flowspec> fss = new ArrayList<>();
  79
  80         while (nlri.isReadable()) {
  81             final FlowspecBuilder builder = new FlowspecBuilder();
  82             builder.setFlowspecType(this.flowspecTypeRegistry.parseFlowspecType(nlri));
  83             fss.add(builder.build());
  84         }
  85
  86         return fss;
  87     }
  88 }
  89