bgp/linkstate/src/main/java/org/opendaylight/protocol/bgp/linkstate/attribute/sr/SrLinkAttributesParser.java

   1 /*
   2  * Copyright (c) 2014 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 package org.opendaylight.protocol.bgp.linkstate.attribute.sr;
   9
  10 import io.netty.buffer.ByteBuf;
  11 import io.netty.buffer.Unpooled;
  12 import org.opendaylight.protocol.bgp.linkstate.attribute.sr.SidLabelIndexParser.Size;
  13 import org.opendaylight.protocol.util.ByteArray;
  14 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.link.state.SrLanAdjId;
  15 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.link.state.SrLanAdjIdBuilder;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.AdjSidTlv;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.Weight;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.sid.label.index.SidLabelIndex;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.network.concepts.rev131125.IsoSystemIdentifier;
  20 import org.opendaylight.yangtools.yang.binding.DataContainer;
  21
  22 public final class SrLinkAttributesParser {
  23
  24     private static final int ISO_SYSTEM_ID_SIZE = 6;
  25     private static final int RESERVED = 2;
  26
  27     /** OSPF flags
  28        0 1 2 3 4 5 6 7
  29       +-+-+-+-+-+-+-+-+
  30       |B|V|L|S|       |
  31       +-+-+-+-+-+-+-+-+
  32
  33        ISIS flags
  34        0 1 2 3 4 5 6 7
  35       +-+-+-+-+-+-+-+-+
  36       |F|B|V|L|S|     |
  37       +-+-+-+-+-+-+-+-+
  38      */
  39
  40     private SrLinkAttributesParser() {
  41         throw new UnsupportedOperationException();
  42     }
  43
  44     public static AdjSidTlv parseAdjacencySegmentIdentifier(final ByteBuf buffer) {
  45         final byte[] adjFlags;
  46         final Weight weight;
  47         final SidLabelIndex sidValue;
  48         if (buffer.isReadable()) {
  49             adjFlags = new byte[] { (byte) buffer.readUnsignedByte() };
  50             weight = new Weight(buffer.readUnsignedByte());
  51             buffer.skipBytes(RESERVED);
  52             sidValue = SidLabelIndexParser.parseSidLabelIndex(Size.forValue(buffer.readableBytes()), buffer);
  53         } else {
  54             adjFlags = null;
  55             weight = null;
  56             sidValue = null;
  57         }
  58         return new AdjSidTlv() {
  59             @Override
  60             public Class<? extends DataContainer> getImplementedInterface() {
  61                 return AdjSidTlv.class;
  62             }
  63             @Override
  64             public Weight getWeight() {
  65                 return weight;
  66             }
  67             @Override
  68             public SidLabelIndex getSidLabelIndex() {
  69                 return sidValue;
  70             }
  71             @Override
  72             public byte[] getFlags() {
  73                 return adjFlags;
  74             }
  75         };
  76     }
  77
  78     public static SrLanAdjId parseLanAdjacencySegmentIdentifier(final ByteBuf buffer) {
  79         if (!buffer.isReadable()) {
  80             return new SrLanAdjIdBuilder().build();
  81         }
  82         final SrLanAdjIdBuilder srLanAdjIdBuilder = new SrLanAdjIdBuilder();
  83         srLanAdjIdBuilder.setFlags(new byte[] { (byte) buffer.readUnsignedByte() });
  84         srLanAdjIdBuilder.setWeight(new Weight(buffer.readUnsignedByte()));
  85         buffer.skipBytes(RESERVED);
  86         srLanAdjIdBuilder.setIsoSystemId(new IsoSystemIdentifier(ByteArray.readBytes(buffer, ISO_SYSTEM_ID_SIZE)));
  87         // length determines a type of next field, which is used for parsing
  88         srLanAdjIdBuilder.setSidLabelIndex(SidLabelIndexParser.parseSidLabelIndex(Size.forValue(buffer.readableBytes()), buffer));
  89         return srLanAdjIdBuilder.build();
  90     }
  91
  92     public static ByteBuf serializeAdjacencySegmentIdentifier(final AdjSidTlv adjSid) {
  93         final ByteBuf value = Unpooled.buffer();
  94         value.writeBytes(adjSid.getFlags());
  95         value.writeByte(adjSid.getWeight().getValue());
  96         value.writeZero(RESERVED);
  97         value.writeBytes(SidLabelIndexParser.serializeSidValue(adjSid.getSidLabelIndex()));
  98         return value;
  99     }
 100
 101     public static ByteBuf serializeLanAdjacencySegmentIdentifier(final SrLanAdjId srLanAdjId) {
 102         final ByteBuf value = Unpooled.buffer();
 103         value.writeBytes(srLanAdjId.getFlags());
 104         value.writeByte(srLanAdjId.getWeight().getValue());
 105         value.writeZero(RESERVED);
 106         value.writeBytes(srLanAdjId.getIsoSystemId().getValue());
 107         value.writeBytes(SidLabelIndexParser.serializeSidValue(srLanAdjId.getSidLabelIndex()));
 108         return value;
 109     }
 110
 111 }