bgp/inet/src/main/java/org/opendaylight/protocol/bgp/inet/codec/Ipv4NlriParser.java

   1 /*
   2  * Copyright (c) 2013, 2016 Cisco 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
   9 package org.opendaylight.protocol.bgp.inet.codec;
  10
  11 import io.netty.buffer.ByteBuf;
  12 import java.util.ArrayList;
  13 import java.util.List;
  14 import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
  15 import org.opendaylight.protocol.bgp.parser.spi.MultiPathSupportUtil;
  16 import org.opendaylight.protocol.bgp.parser.spi.NlriParser;
  17 import org.opendaylight.protocol.bgp.parser.spi.NlriSerializer;
  18 import org.opendaylight.protocol.bgp.parser.spi.PathIdUtil;
  19 import org.opendaylight.protocol.bgp.parser.spi.PeerSpecificParserConstraint;
  20 import org.opendaylight.protocol.util.ByteBufWriteUtil;
  21 import org.opendaylight.protocol.util.Ipv4Util;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.ipv4.prefixes.DestinationIpv4;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.ipv4.prefixes.DestinationIpv4Builder;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.ipv4.prefixes.destination.ipv4.Ipv4Prefixes;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.ipv4.prefixes.destination.ipv4.Ipv4PrefixesBuilder;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationIpv4Case;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationIpv4CaseBuilder;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.path.attributes.Attributes;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.Attributes1;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.Attributes2;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.update.attributes.MpReachNlriBuilder;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.update.attributes.MpUnreachNlriBuilder;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.update.attributes.mp.reach.nlri.AdvertizedRoutes;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.update.attributes.mp.reach.nlri.AdvertizedRoutesBuilder;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.update.attributes.mp.unreach.nlri.WithdrawnRoutes;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.update.attributes.mp.unreach.nlri.WithdrawnRoutesBuilder;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev180329.AddressFamily;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev180329.SubsequentAddressFamily;
  39
  40 public final class Ipv4NlriParser implements NlriParser, NlriSerializer {
  41
  42     private static DestinationIpv4 prefixes(final ByteBuf nlri, final PeerSpecificParserConstraint constraints,
  43             final Class<? extends AddressFamily> afi, final Class<? extends SubsequentAddressFamily> safi) {
  44         final List<Ipv4Prefixes> prefixes = new ArrayList<>();
  45         while (nlri.isReadable()) {
  46             final Ipv4PrefixesBuilder prefixesBuilder = new Ipv4PrefixesBuilder();
  47             if (MultiPathSupportUtil.isTableTypeSupported(constraints, new BgpTableTypeImpl(afi, safi))) {
  48                 prefixesBuilder.setPathId(PathIdUtil.readPathId(nlri));
  49             }
  50             prefixesBuilder.setPrefix(Ipv4Util.prefixForByteBuf(nlri));
  51             prefixes.add(prefixesBuilder.build());
  52         }
  53         return new DestinationIpv4Builder().setIpv4Prefixes(prefixes).build();
  54     }
  55
  56     @Override
  57     public void parseNlri(final ByteBuf nlri, final MpReachNlriBuilder builder,
  58             final PeerSpecificParserConstraint constraint) {
  59         builder.setAdvertizedRoutes(new AdvertizedRoutesBuilder().setDestinationType(
  60                 new DestinationIpv4CaseBuilder().setDestinationIpv4(prefixes(nlri, constraint,
  61                         builder.getAfi(), builder.getSafi())).build()).build());
  62     }
  63
  64     @Override
  65     public void parseNlri(final ByteBuf nlri, final MpUnreachNlriBuilder builder,
  66             final PeerSpecificParserConstraint constraint) {
  67         builder.setWithdrawnRoutes(new WithdrawnRoutesBuilder().setDestinationType(
  68                 new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.update
  69                         .attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationIpv4CaseBuilder()
  70                         .setDestinationIpv4(prefixes(nlri, constraint, builder.getAfi(), builder.getSafi()))
  71                         .build()).build());
  72     }
  73
  74     @Override
  75     public void serializeAttribute(final Attributes pathAttributes, final ByteBuf byteAggregator) {
  76         final Attributes1 pathAttributes1 = pathAttributes.augmentation(Attributes1.class);
  77         final Attributes2 pathAttributes2 = pathAttributes.augmentation(Attributes2.class);
  78         if (pathAttributes1 != null) {
  79             final AdvertizedRoutes advertizedRoutes = pathAttributes1.getMpReachNlri().getAdvertizedRoutes();
  80             if (advertizedRoutes != null && advertizedRoutes.getDestinationType() instanceof DestinationIpv4Case) {
  81                 final DestinationIpv4Case destinationIpv4Case =
  82                         (DestinationIpv4Case) advertizedRoutes.getDestinationType();
  83                 for (final Ipv4Prefixes ipv4Prefix : destinationIpv4Case.getDestinationIpv4().getIpv4Prefixes()) {
  84                     PathIdUtil.writePathId(ipv4Prefix.getPathId(), byteAggregator);
  85                     ByteBufWriteUtil.writeMinimalPrefix(ipv4Prefix.getPrefix(), byteAggregator);
  86                 }
  87             }
  88         } else if (pathAttributes2 != null) {
  89             final WithdrawnRoutes withdrawnRoutes = pathAttributes2.getMpUnreachNlri().getWithdrawnRoutes();
  90             if (withdrawnRoutes != null && withdrawnRoutes.getDestinationType() instanceof org.opendaylight.yang.gen
  91                     .v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.update.attributes.mp.unreach.nlri
  92                     .withdrawn.routes.destination.type.DestinationIpv4Case) {
  93                 final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.update
  94                         .attributes.mp.unreach.nlri.withdrawn.routes.destination.type
  95                         .DestinationIpv4Case destinationIpv4Case = (org.opendaylight.yang.gen.v1.urn.opendaylight
  96                         .params.xml.ns.yang.bgp.inet.rev180329.update.attributes.mp.unreach.nlri.withdrawn.routes
  97                         .destination.type.DestinationIpv4Case) withdrawnRoutes.getDestinationType();
  98                 for (final Ipv4Prefixes ipv4Prefix : destinationIpv4Case.getDestinationIpv4().getIpv4Prefixes()) {
  99                     PathIdUtil.writePathId(ipv4Prefix.getPathId(), byteAggregator);
 100                     ByteBufWriteUtil.writeMinimalPrefix(ipv4Prefix.getPrefix(), byteAggregator);
 101                 }
 102             }
 103         }
 104     }
 105 }