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 com.google.common.base.Preconditions;
  12 import io.netty.buffer.ByteBuf;
  13 import java.util.ArrayList;
  14 import java.util.List;
  15 import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
  16 import org.opendaylight.protocol.bgp.parser.spi.MultiPathSupportUtil;
  17 import org.opendaylight.protocol.bgp.parser.spi.NlriParser;
  18 import org.opendaylight.protocol.bgp.parser.spi.NlriSerializer;
  19 import org.opendaylight.protocol.bgp.parser.spi.PathIdUtil;
  20 import org.opendaylight.protocol.bgp.parser.spi.PeerSpecificParserConstraint;
  21 import org.opendaylight.protocol.util.ByteBufWriteUtil;
  22 import org.opendaylight.protocol.util.Ipv4Util;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.ipv4.prefixes.DestinationIpv4;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.ipv4.prefixes.DestinationIpv4Builder;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.ipv4.prefixes.destination.ipv4.Ipv4Prefixes;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.ipv4.prefixes.destination.ipv4.Ipv4PrefixesBuilder;
  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.DestinationIpv4Case;
  28 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;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.path.attributes.Attributes;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.Attributes1;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.Attributes2;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.MpReachNlriBuilder;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.MpUnreachNlriBuilder;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.mp.reach.nlri.AdvertizedRoutes;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.mp.reach.nlri.AdvertizedRoutesBuilder;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.mp.unreach.nlri.WithdrawnRoutes;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.mp.unreach.nlri.WithdrawnRoutesBuilder;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
  40 import org.opendaylight.yangtools.yang.binding.DataObject;
  41
  42 public final class Ipv4NlriParser implements NlriParser, NlriSerializer {
  43
  44     private static DestinationIpv4 prefixes(final ByteBuf nlri, final PeerSpecificParserConstraint constraints,
  45             final Class<? extends AddressFamily> afi, final Class<? extends SubsequentAddressFamily> safi) {
  46         final List<Ipv4Prefixes> prefixes = new ArrayList<>();
  47         while (nlri.isReadable()) {
  48             final Ipv4PrefixesBuilder prefixesBuilder = new Ipv4PrefixesBuilder();
  49             if (MultiPathSupportUtil.isTableTypeSupported(constraints, new BgpTableTypeImpl(afi, safi))) {
  50                 prefixesBuilder.setPathId(PathIdUtil.readPathId(nlri));
  51             }
  52             prefixesBuilder.setPrefix(Ipv4Util.prefixForByteBuf(nlri));
  53             prefixes.add(prefixesBuilder.build());
  54         }
  55         return new DestinationIpv4Builder().setIpv4Prefixes(prefixes).build();
  56     }
  57
  58     @Override
  59     public void parseNlri(final ByteBuf nlri, final MpUnreachNlriBuilder builder) {
  60         parseNlri(nlri, builder, null);
  61     }
  62
  63     @Override
  64     public void parseNlri(final ByteBuf nlri, final MpReachNlriBuilder builder) {
  65         parseNlri(nlri, builder, null);
  66     }
  67
  68     @Override
  69     public void parseNlri(final ByteBuf nlri, final MpReachNlriBuilder builder,
  70             final PeerSpecificParserConstraint constraint) {
  71         builder.setAdvertizedRoutes(new AdvertizedRoutesBuilder().setDestinationType(
  72                 new DestinationIpv4CaseBuilder().setDestinationIpv4(prefixes(nlri, constraint,
  73                         builder.getAfi(), builder.getSafi())).build()).build());
  74     }
  75
  76     @Override
  77     public void parseNlri(final ByteBuf nlri, final MpUnreachNlriBuilder builder,
  78             final PeerSpecificParserConstraint constraint) {
  79         builder.setWithdrawnRoutes(new WithdrawnRoutesBuilder().setDestinationType(
  80                 new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.update
  81                         .attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationIpv4CaseBuilder()
  82                         .setDestinationIpv4(prefixes(nlri, constraint, builder.getAfi(), builder.getSafi()))
  83                         .build()).build());
  84     }
  85
  86     @Override
  87     public void serializeAttribute(final DataObject attribute, final ByteBuf byteAggregator) {
  88         Preconditions.checkArgument(attribute instanceof Attributes,
  89                 "Attribute parameter is not a PathAttribute object.");
  90         final Attributes pathAttributes = (Attributes) attribute;
  91         final Attributes1 pathAttributes1 = pathAttributes.getAugmentation(Attributes1.class);
  92         final Attributes2 pathAttributes2 = pathAttributes.getAugmentation(Attributes2.class);
  93         if (pathAttributes1 != null) {
  94             final AdvertizedRoutes advertizedRoutes = pathAttributes1.getMpReachNlri().getAdvertizedRoutes();
  95             if (advertizedRoutes != null && advertizedRoutes.getDestinationType() instanceof DestinationIpv4Case) {
  96                 final DestinationIpv4Case destinationIpv4Case =
  97                         (DestinationIpv4Case) advertizedRoutes.getDestinationType();
  98                 for (final Ipv4Prefixes ipv4Prefix : destinationIpv4Case.getDestinationIpv4().getIpv4Prefixes()) {
  99                     PathIdUtil.writePathId(ipv4Prefix.getPathId(), byteAggregator);
 100                     ByteBufWriteUtil.writeMinimalPrefix(ipv4Prefix.getPrefix(), byteAggregator);
 101                 }
 102             }
 103         } else if (pathAttributes2 != null) {
 104             final WithdrawnRoutes withdrawnRoutes = pathAttributes2.getMpUnreachNlri().getWithdrawnRoutes();
 105             if (withdrawnRoutes != null && withdrawnRoutes.getDestinationType() instanceof org.opendaylight.yang.gen
 106                     .v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.update.attributes.mp.unreach.nlri
 107                     .withdrawn.routes.destination.type.DestinationIpv4Case) {
 108                 final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev180329.update
 109                         .attributes.mp.unreach.nlri.withdrawn.routes.destination.type
 110                         .DestinationIpv4Case destinationIpv4Case = (org.opendaylight.yang.gen.v1.urn.opendaylight
 111                         .params.xml.ns.yang.bgp.inet.rev180329.update.attributes.mp.unreach.nlri.withdrawn.routes
 112                         .destination.type.DestinationIpv4Case) withdrawnRoutes.getDestinationType();
 113                 for (final Ipv4Prefixes ipv4Prefix : destinationIpv4Case.getDestinationIpv4().getIpv4Prefixes()) {
 114                     PathIdUtil.writePathId(ipv4Prefix.getPathId(), byteAggregator);
 115                     ByteBufWriteUtil.writeMinimalPrefix(ipv4Prefix.getPrefix(), byteAggregator);
 116                 }
 117             }
 118         }
 119     }
 120 }