bgp/extensions/l3vpn/src/main/java/org/opendaylight/protocol/bgp/l3vpn/mcast/nlri/L3vpnMcastNlriSerializer.java

   1 /*
   2  * Copyright (c) 2018 AT&T Intellectual Property. 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.l3vpn.mcast.nlri;
  10
  11 import static org.opendaylight.protocol.util.Ipv6Util.IPV6_BITS_LENGTH;
  12
  13 import io.netty.buffer.ByteBuf;
  14 import io.netty.buffer.Unpooled;
  15 import java.util.ArrayList;
  16 import java.util.List;
  17 import org.opendaylight.bgp.concepts.RouteDistinguisherUtil;
  18 import org.opendaylight.protocol.bgp.parser.spi.PathIdUtil;
  19 import org.opendaylight.protocol.util.ByteBufWriteUtil;
  20 import org.opendaylight.protocol.util.Ipv4Util;
  21 import org.opendaylight.protocol.util.Ipv6Util;
  22 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.l3vpn.mcast.rev180417.l3vpn.mcast.destination.L3vpnMcastDestination;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.l3vpn.mcast.rev180417.l3vpn.mcast.destination.L3vpnMcastDestinationBuilder;
  25
  26 public final class L3vpnMcastNlriSerializer {
  27     private L3vpnMcastNlriSerializer() {
  28         throw new UnsupportedOperationException();
  29     }
  30
  31     static List<L3vpnMcastDestination> extractDest(final ByteBuf nlri, final boolean addPath) {
  32         List<L3vpnMcastDestination> dests = new ArrayList<>();
  33         while (nlri.isReadable()) {
  34             final L3vpnMcastDestinationBuilder builder = new L3vpnMcastDestinationBuilder();
  35             if (addPath) {
  36                 builder.setPathId(PathIdUtil.readPathId(nlri));
  37             }
  38             final int length = nlri.readUnsignedByte();
  39
  40             final int initialLength = nlri.readableBytes();
  41             builder.setRouteDistinguisher(RouteDistinguisherUtil.parseRouteDistinguisher(nlri));
  42             if (length == IPV6_BITS_LENGTH) {
  43                 builder.setPrefix(new IpPrefix(Ipv6Util.prefixForByteBuf(nlri)));
  44             } else {
  45                 builder.setPrefix(new IpPrefix(Ipv4Util.prefixForByteBuf(nlri)));
  46             }
  47             dests.add(builder.build());
  48             int readed = initialLength - nlri.readableBytes();
  49             while (readed % 8 != 0) {
  50                 nlri.readByte();
  51                 readed = initialLength - nlri.readableBytes();
  52             }
  53         }
  54         return dests;
  55     }
  56
  57     public static void serializeNlri(final List<L3vpnMcastDestination> destinationList, final ByteBuf output) {
  58         for (final L3vpnMcastDestination dest : destinationList) {
  59             PathIdUtil.writePathId(dest.getPathId(), output);
  60             ByteBuf prefixBuf = Unpooled.buffer();
  61             RouteDistinguisherUtil.serializeRouteDistinquisher(dest.getRouteDistinguisher(), prefixBuf);
  62             final IpPrefix prefix = dest.getPrefix();
  63             if (prefix.getIpv4Prefix() != null) {
  64                 output.writeByte(Ipv4Util.IP4_BITS_LENGTH);
  65                 ByteBufWriteUtil.writeMinimalPrefix(prefix.getIpv4Prefix(), prefixBuf);
  66             } else {
  67                 output.writeByte(IPV6_BITS_LENGTH);
  68                 ByteBufWriteUtil.writeMinimalPrefix(prefix.getIpv6Prefix(), prefixBuf);
  69             }
  70             while (prefixBuf.readableBytes() % 8 != 0) {
  71                 prefixBuf.writeZero(1);
  72             }
  73             output.writeBytes(prefixBuf);
  74         }
  75     }
  76 }