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

   1 /*
   2  * Copyright (c) 2015 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 java.util.ArrayList;
  13 import java.util.List;
  14 import org.opendaylight.protocol.bgp.linkstate.attribute.PrefixAttributesParser;
  15 import org.opendaylight.protocol.bgp.linkstate.attribute.sr.SidLabelIndexParser.Size;
  16 import org.opendaylight.protocol.bgp.linkstate.spi.TlvUtil;
  17 import org.opendaylight.protocol.util.BitArray;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.ProtocolId;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrRange;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrRangeBuilder;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.RangeSubTlv;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.BindingSidTlvCase;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.BindingSidTlvCaseBuilder;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.Ipv6PrefixSidTlvCase;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.Ipv6PrefixSidTlvCaseBuilder;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.PrefixSidTlvCase;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.PrefixSidTlvCaseBuilder;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.SidLabelTlvCase;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.SidLabelTlvCaseBuilder;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.tlv.SubTlvs;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.tlv.SubTlvsBuilder;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 public final class RangeTlvParser {
  36
  37     private static final Logger LOG = LoggerFactory.getLogger(RangeTlvParser.class);
  38
  39     private RangeTlvParser() {
  40         throw new UnsupportedOperationException();
  41     }
  42
  43     /* Flags */
  44     private static final int FLAGS_SIZE = 8;
  45     private static final int INNER_AREA = 0;
  46
  47     private static final int RESERVED = 1;
  48
  49     public static SrRange parseSrRange(final ByteBuf buffer, final ProtocolId protocolId) {
  50         final BitArray flags = BitArray.valueOf(buffer, FLAGS_SIZE);
  51         final SrRangeBuilder range = new SrRangeBuilder();
  52         if (protocolId.equals(ProtocolId.Ospf)) {
  53             range.setInterArea(flags.get(INNER_AREA));
  54         } else {
  55             range.setInterArea(Boolean.FALSE);
  56         }
  57         buffer.skipBytes(RESERVED);
  58         range.setRangeSize(buffer.readUnsignedShort());
  59         range.setSubTlvs(parseRangeSubTlvs(buffer, protocolId));
  60         return range.build();
  61     }
  62
  63     private static List<SubTlvs> parseRangeSubTlvs(final ByteBuf buffer, final ProtocolId protocolId) {
  64         final List<SubTlvs> subTlvs = new ArrayList<>();
  65         while (buffer.isReadable()) {
  66             final SubTlvsBuilder subTlv = new SubTlvsBuilder();
  67             RangeSubTlv subTlvCase = null;
  68             final int type = buffer.readUnsignedShort();
  69             final int length = buffer.readUnsignedShort();
  70             switch (type) {
  71             case PrefixAttributesParser.PREFIX_SID:
  72                 subTlvCase = new PrefixSidTlvCaseBuilder(SrPrefixAttributesParser.parseSrPrefix(buffer.readSlice(length), protocolId)).build();
  73                 break;
  74             case PrefixAttributesParser.IPV6_PREFIX_SID:
  75                 subTlvCase = new Ipv6PrefixSidTlvCaseBuilder(Ipv6SrPrefixAttributesParser.parseSrIpv6Prefix(buffer.readSlice(length))).build();
  76                 break;
  77             case PrefixAttributesParser.BINDING_SID:
  78                 subTlvCase = new BindingSidTlvCaseBuilder(BindingSidLabelParser.parseBindingSidLabel(buffer.readSlice(length), protocolId)).build();
  79                 break;
  80             case SidLabelIndexParser.SID_TYPE:
  81                 subTlvCase = new SidLabelTlvCaseBuilder().setSidLabelIndex(SidLabelIndexParser.parseSidLabelIndex(Size.forValue(length), buffer.readSlice(length))).build();
  82                 break;
  83             default:
  84                 LOG.info("Unknown type of range sub-tlv: {}", type);
  85                 buffer.skipBytes(length);
  86                 continue;
  87             }
  88             subTlvs.add(subTlv.setRangeSubTlv(subTlvCase).build());
  89         }
  90         return subTlvs;
  91     }
  92
  93     public static void serializeSrRange(final SrRange srRange, final ByteBuf aggregator) {
  94         final BitArray flags = new BitArray(FLAGS_SIZE);
  95         flags.set(INNER_AREA, srRange.isInterArea());
  96         flags.toByteBuf(aggregator);
  97         aggregator.writeZero(RESERVED);
  98         aggregator.writeShort(srRange.getRangeSize());
  99         serializeSubTlvs(aggregator, srRange.getSubTlvs());
 100     }
 101
 102     private static void serializeSubTlvs(final ByteBuf aggregator, final List<SubTlvs> subTlvs) {
 103         for (final SubTlvs subTlv : subTlvs) {
 104             ByteBuf buffer = Unpooled.buffer();
 105             final RangeSubTlv rangeSubTlv = subTlv.getRangeSubTlv();
 106             if (rangeSubTlv instanceof PrefixSidTlvCase) {
 107                 final PrefixSidTlvCase prefixSidTlv = (PrefixSidTlvCase) rangeSubTlv;
 108                 SrPrefixAttributesParser.serializePrefixAttributes(
 109                     prefixSidTlv.getFlags(),
 110                     prefixSidTlv.getAlgorithm(),
 111                     prefixSidTlv.getSidLabelIndex(),
 112                     buffer);
 113                 TlvUtil.writeTLV(PrefixAttributesParser.PREFIX_SID, buffer, aggregator);
 114             } else if (rangeSubTlv instanceof Ipv6PrefixSidTlvCase) {
 115                 final Ipv6PrefixSidTlvCase prefixSidTlv = (Ipv6PrefixSidTlvCase) rangeSubTlv;
 116                 Ipv6SrPrefixAttributesParser.serializePrefixAttributes(prefixSidTlv.getAlgorithm(), buffer);
 117                 TlvUtil.writeTLV(PrefixAttributesParser.IPV6_PREFIX_SID, buffer, aggregator);
 118             } else if (rangeSubTlv instanceof BindingSidTlvCase) {
 119                 final BindingSidTlvCase rangeTlv = (BindingSidTlvCase) rangeSubTlv;
 120                 BindingSidLabelParser.serializeBindingSidAttributes(
 121                     rangeTlv.getWeight(),
 122                     rangeTlv.getFlags(),
 123                     rangeTlv.getBindingSubTlvs(),
 124                     buffer);
 125                 TlvUtil.writeTLV(PrefixAttributesParser.BINDING_SID, buffer, aggregator);
 126             } else if (rangeSubTlv instanceof SidLabelTlvCase) {
 127                 buffer = SidLabelIndexParser.serializeSidValue(((SidLabelTlvCase) rangeSubTlv).getSidLabelIndex());
 128                 TlvUtil.writeTLV(SidLabelIndexParser.SID_TYPE, buffer, aggregator);
 129             }
 130         }
 131     }
 132
 133 }