bgp/extensions/linkstate/src/main/java/org/opendaylight/protocol/bgp/linkstate/impl/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.impl.attribute.sr;
   9
  10 import static org.opendaylight.protocol.bgp.linkstate.impl.attribute.PrefixAttributesParser.BINDING_SID;
  11 import static org.opendaylight.protocol.bgp.linkstate.impl.attribute.sr.binding.sid.sub.tlvs.Ipv4PrefixSidParser.PREFIX_SID;
  12 import static org.opendaylight.protocol.bgp.linkstate.impl.attribute.sr.binding.sid.sub.tlvs.Ipv6PrefixSidParser.IPV6_PREFIX_SID;
  13 import static org.opendaylight.protocol.bgp.linkstate.impl.attribute.sr.binding.sid.sub.tlvs.SIDParser.SID_TYPE;
  14
  15 import io.netty.buffer.ByteBuf;
  16 import io.netty.buffer.Unpooled;
  17 import java.util.ArrayList;
  18 import java.util.List;
  19 import org.opendaylight.protocol.bgp.linkstate.impl.attribute.sr.SidLabelIndexParser.Size;
  20 import org.opendaylight.protocol.bgp.linkstate.spi.TlvUtil;
  21 import org.opendaylight.protocol.util.BitArray;
  22 import org.opendaylight.protocol.util.ByteBufUtils;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev180329.ProtocolId;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev180329.prefix.state.SrRange;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev180329.prefix.state.SrRangeBuilder;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.RangeSubTlv;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.BindingSidTlvCase;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.BindingSidTlvCaseBuilder;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.Ipv6PrefixSidTlvCase;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.Ipv6PrefixSidTlvCaseBuilder;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.PrefixSidTlvCase;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.PrefixSidTlvCaseBuilder;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.SidLabelTlvCase;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.sub.tlvs.range.sub.tlv.SidLabelTlvCaseBuilder;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.tlv.SubTlvs;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.range.tlv.SubTlvsBuilder;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39
  40 public final class RangeTlvParser {
  41     private static final Logger LOG = LoggerFactory.getLogger(RangeTlvParser.class);
  42     /* Flags */
  43     private static final int FLAGS_SIZE = 8;
  44     private static final int INNER_AREA = 0;
  45     private static final int RESERVED = 1;
  46
  47     private RangeTlvParser() {
  48
  49     }
  50
  51     public static SrRange parseSrRange(final ByteBuf buffer, final ProtocolId protocolId) {
  52         final BitArray flags = BitArray.valueOf(buffer, FLAGS_SIZE);
  53         final SrRangeBuilder range = new SrRangeBuilder();
  54         if (protocolId.equals(ProtocolId.Ospf)) {
  55             range.setInterArea(flags.get(INNER_AREA));
  56         } else {
  57             range.setInterArea(Boolean.FALSE);
  58         }
  59         buffer.skipBytes(RESERVED);
  60         range.setRangeSize(ByteBufUtils.readUint16(buffer));
  61         range.setSubTlvs(parseRangeSubTlvs(buffer, protocolId));
  62         return range.build();
  63     }
  64
  65     private static List<SubTlvs> parseRangeSubTlvs(final ByteBuf buffer, final ProtocolId protocolId) {
  66         final List<SubTlvs> subTlvs = new ArrayList<>();
  67         while (buffer.isReadable()) {
  68             final SubTlvsBuilder subTlv = new SubTlvsBuilder();
  69             final RangeSubTlv subTlvCase;
  70             final int type = buffer.readUnsignedShort();
  71             final int length = buffer.readUnsignedShort();
  72             switch (type) {
  73                 case PREFIX_SID:
  74                     subTlvCase = new PrefixSidTlvCaseBuilder(
  75                         SrPrefixAttributesParser.parseSrPrefix(buffer.readSlice(length), protocolId)).build();
  76                     break;
  77                 case IPV6_PREFIX_SID:
  78                     subTlvCase = new Ipv6PrefixSidTlvCaseBuilder(
  79                         Ipv6SrPrefixAttributesParser.parseSrIpv6Prefix(buffer.readSlice(length))).build();
  80                     break;
  81                 case BINDING_SID:
  82                     subTlvCase = new BindingSidTlvCaseBuilder(
  83                         BindingSidLabelParser.parseBindingSidLabel(buffer.readSlice(length), protocolId)).build();
  84                     break;
  85                 case SID_TYPE:
  86                     subTlvCase = new SidLabelTlvCaseBuilder().setSidLabelIndex(
  87                         SidLabelIndexParser.parseSidLabelIndex(Size.forValue(length), buffer.readSlice(length)))
  88                     .build();
  89                     break;
  90                 default:
  91                     LOG.info("Unknown type of range sub-tlv: {}", type);
  92                     buffer.skipBytes(length);
  93                     continue;
  94             }
  95             subTlvs.add(subTlv.setRangeSubTlv(subTlvCase).build());
  96         }
  97         return subTlvs;
  98     }
  99
 100     public static void serializeSrRange(final SrRange srRange, final ByteBuf aggregator) {
 101         final BitArray flags = new BitArray(FLAGS_SIZE);
 102         flags.set(INNER_AREA, srRange.isInterArea());
 103         flags.toByteBuf(aggregator);
 104         aggregator.writeZero(RESERVED);
 105         aggregator.writeShort(srRange.getRangeSize().toJava());
 106         serializeSubTlvs(aggregator, srRange.getSubTlvs());
 107     }
 108
 109     private static void serializeSubTlvs(final ByteBuf aggregator, final List<SubTlvs> subTlvs) {
 110         for (final SubTlvs subTlv : subTlvs) {
 111             ByteBuf buffer = Unpooled.buffer();
 112             final RangeSubTlv rangeSubTlv = subTlv.getRangeSubTlv();
 113             if (rangeSubTlv instanceof PrefixSidTlvCase) {
 114                 final PrefixSidTlvCase prefixSidTlv = (PrefixSidTlvCase) rangeSubTlv;
 115                 SrPrefixAttributesParser.serializePrefixAttributes(
 116                     prefixSidTlv.getFlags(),
 117                     prefixSidTlv.getAlgorithm(),
 118                     prefixSidTlv.getSidLabelIndex(),
 119                     buffer);
 120                 TlvUtil.writeTLV(PREFIX_SID, buffer, aggregator);
 121             } else if (rangeSubTlv instanceof Ipv6PrefixSidTlvCase) {
 122                 final Ipv6PrefixSidTlvCase prefixSidTlv = (Ipv6PrefixSidTlvCase) rangeSubTlv;
 123                 Ipv6SrPrefixAttributesParser.serializePrefixAttributes(prefixSidTlv.getAlgorithm(), buffer);
 124                 TlvUtil.writeTLV(IPV6_PREFIX_SID, buffer, aggregator);
 125             } else if (rangeSubTlv instanceof BindingSidTlvCase) {
 126                 final BindingSidTlvCase rangeTlv = (BindingSidTlvCase) rangeSubTlv;
 127                 BindingSidLabelParser.serializeBindingSidAttributes(
 128                     rangeTlv.getWeight(),
 129                     rangeTlv.getFlags(),
 130                     rangeTlv.getBindingSubTlvs(),
 131                     buffer);
 132                 TlvUtil.writeTLV(BINDING_SID, buffer, aggregator);
 133             } else if (rangeSubTlv instanceof SidLabelTlvCase) {
 134                 buffer = SidLabelIndexParser.serializeSidValue(((SidLabelTlvCase) rangeSubTlv).getSidLabelIndex());
 135                 TlvUtil.writeTLV(SID_TYPE, buffer, aggregator);
 136             }
 137         }
 138     }
 139
 140 }