bgp/evpn/src/main/java/org/opendaylight/protocol/bgp/evpn/impl/nlri/EthSegRParser.java

   1 /*
   2  * Copyright (c) 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.evpn.impl.nlri;
  10
  11 import static java.util.Objects.requireNonNull;
  12 import static org.opendaylight.protocol.bgp.evpn.impl.nlri.NlriModelUtil.extractOrigRouteIp;
  13
  14 import com.google.common.base.Preconditions;
  15 import io.netty.buffer.ByteBuf;
  16 import io.netty.buffer.Unpooled;
  17 import org.opendaylight.protocol.bgp.evpn.spi.pojo.SimpleEsiTypeRegistry;
  18 import org.opendaylight.protocol.util.Ipv4Util;
  19 import org.opendaylight.protocol.util.Ipv6Util;
  20 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.NlriType;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.es.route.EsRoute;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.es.route.EsRouteBuilder;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.esi.Esi;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.evpn.EvpnChoice;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.evpn.evpn.choice.EsRouteCase;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.evpn.evpn.choice.EsRouteCaseBuilder;
  28 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  29 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  30
  31 final class EthSegRParser extends AbstractEvpnNlri {
  32     protected static final NodeIdentifier ES_ROUTE_NID = new NodeIdentifier(EsRoute.QNAME);
  33     private static final int CONTENT_LENGTH = 15;
  34     private static final int CONTENT_LENGTH2 = 27;
  35
  36     @Override
  37     public EvpnChoice parseEvpn(final ByteBuf buffer) {
  38         Preconditions.checkArgument(buffer.readableBytes() == CONTENT_LENGTH || buffer.readableBytes() == CONTENT_LENGTH2,
  39             "Wrong length of array of bytes. Passed: %s ;", buffer);
  40
  41         final Esi esi = SimpleEsiTypeRegistry.getInstance().parseEsi(buffer.readSlice(ESI_SIZE));
  42         final IpAddress ip = requireNonNull(parseOrigRouteIp(buffer));
  43
  44         final EsRouteBuilder builder = new EsRouteBuilder().setEsi(esi).setOrigRouteIp(ip);
  45         return new EsRouteCaseBuilder().setEsRoute(builder.build()).build();
  46     }
  47
  48     @Override
  49     protected NlriType getType() {
  50         return NlriType.EthSeg;
  51     }
  52
  53     @Override
  54     public ByteBuf serializeBody(final EvpnChoice evpnInput) {
  55         Preconditions.checkArgument(evpnInput instanceof EsRouteCase, "Unknown evpn instance. Passed %s. Needed EsRouteCase.",
  56             evpnInput.getClass());
  57         return serializeBody(((EsRouteCase) evpnInput).getEsRoute());
  58     }
  59
  60     @Override
  61     public EvpnChoice serializeEvpnModel(final ContainerNode evpnCase) {
  62         return createRouteKey(evpnCase);
  63     }
  64
  65     @Override
  66     public EvpnChoice createRouteKey(final ContainerNode evpn) {
  67         final EsRouteBuilder builder = new EsRouteBuilder();
  68         builder.setEsi(serializeEsi(evpn));
  69         builder.setOrigRouteIp(extractOrigRouteIp(evpn));
  70         return new EsRouteCaseBuilder().setEsRoute(builder.build()).build();
  71     }
  72
  73     private static ByteBuf serializeBody(final EsRoute evpn) {
  74         final ByteBuf body = Unpooled.buffer();
  75         SimpleEsiTypeRegistry.getInstance().serializeEsi(evpn.getEsi(), body);
  76         final ByteBuf orig = serializeOrigRouteIp(evpn.getOrigRouteIp());
  77         Preconditions.checkArgument(orig.readableBytes() > 0);
  78         body.writeBytes(orig);
  79         return body;
  80     }
  81
  82     public static IpAddress parseOrigRouteIp(final ByteBuf buffer) {
  83         final int ipLength = buffer.readUnsignedByte();
  84         if (ipLength == Ipv6Util.IPV6_BITS_LENGTH) {
  85             return new IpAddress(Ipv6Util.addressForByteBuf(buffer));
  86         } else if (ipLength == Ipv4Util.IP4_BITS_LENGTH) {
  87             return new IpAddress(Ipv4Util.addressForByteBuf(buffer));
  88         }
  89         return null;
  90     }
  91
  92     static ByteBuf serializeOrigRouteIp(final IpAddress origRouteIp) {
  93         final ByteBuf body = Unpooled.buffer();
  94         if (origRouteIp.getIpv4Address() != null) {
  95             body.writeByte(Ipv4Util.IP4_BITS_LENGTH);
  96             body.writeBytes(Ipv4Util.bytesForAddress(origRouteIp.getIpv4Address()));
  97         } else if (origRouteIp.getIpv6Address() != null) {
  98             body.writeByte(Ipv6Util.IPV6_BITS_LENGTH);
  99             body.writeBytes(Ipv6Util.bytesForAddress(origRouteIp.getIpv6Address()));
 100         } else {
 101             body.writeZero(ZERO_BYTE);
 102         }
 103         return body;
 104     }
 105 }