2 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.protocol.bgp.linkstate.attribute.sr;
10 import io.netty.buffer.ByteBuf;
11 import org.opendaylight.protocol.bgp.linkstate.attribute.sr.SidLabelIndexParser.Size;
12 import org.opendaylight.protocol.util.BitArray;
13 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.ProtocolId;
14 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrPrefix;
15 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.prefix.state.SrPrefixBuilder;
16 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.Algorithm;
17 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.prefix.sid.tlv.Flags;
18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.prefix.sid.tlv.flags.IsisPrefixFlagsCase;
19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.prefix.sid.tlv.flags.IsisPrefixFlagsCaseBuilder;
20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.prefix.sid.tlv.flags.OspfPrefixFlagsCase;
21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.prefix.sid.tlv.flags.OspfPrefixFlagsCaseBuilder;
22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.segment.routing.ext.rev151014.sid.label.index.SidLabelIndex;
24 public final class SrPrefixAttributesParser {
26 private SrPrefixAttributesParser() {
27 throw new UnsupportedOperationException();
31 private static final int RE_ADVERTISEMENT = 0;
32 private static final int NODE_SID = 1;
33 private static final int NO_PHP_OSPF = 1;
34 private static final int NO_PHP = 2;
35 private static final int MAPPING_SERVER = 2;
36 private static final int EXPLICIT_NULL = 3;
37 private static final int VALUE = 4;
38 private static final int LOCAL = 5;
39 private static final int FLAGS_SIZE = 8;
41 private static final int RESERVED_PREFIX = 2;
43 public static SrPrefix parseSrPrefix(final ByteBuf buffer, final ProtocolId protocol) {
44 final SrPrefixBuilder builder = new SrPrefixBuilder();
45 builder.setFlags(parsePrefixFlags(BitArray.valueOf(buffer, FLAGS_SIZE), protocol));
46 builder.setAlgorithm(Algorithm.forValue(buffer.readUnsignedByte()));
47 buffer.skipBytes(RESERVED_PREFIX);
48 builder.setSidLabelIndex(SidLabelIndexParser.parseSidLabelIndex(Size.forValue(buffer.readableBytes()), buffer));
49 return builder.build();
52 private static Flags parsePrefixFlags(final BitArray flags, final ProtocolId protocol) {
53 if (protocol.equals(ProtocolId.IsisLevel1) || protocol.equals(ProtocolId.IsisLevel2)) {
54 return new IsisPrefixFlagsCaseBuilder()
55 .setReadvertisement(flags.get(RE_ADVERTISEMENT))
56 .setNodeSid(flags.get(NODE_SID))
57 .setNoPhp(flags.get(NO_PHP))
58 .setExplicitNull(flags.get(EXPLICIT_NULL)).build();
60 if (protocol.equals(ProtocolId.Ospf)) {
61 return new OspfPrefixFlagsCaseBuilder()
62 .setExplicitNull(flags.get(EXPLICIT_NULL))
63 .setMappingServer(flags.get(MAPPING_SERVER))
64 .setNoPhp(flags.get(NO_PHP_OSPF)).build();
69 public static void serializeSrPrefix(final SrPrefix srPrefix, final ByteBuf aggregator) {
70 serializePrefixAttributes(srPrefix.getFlags(), srPrefix.getAlgorithm(), srPrefix.getSidLabelIndex(), aggregator);
73 public static void serializePrefixAttributes(final Flags flags, final Algorithm algorithm, final SidLabelIndex sidLabelIndex, final ByteBuf buffer) {
74 final BitArray bitFlags = serializePrefixFlags(flags, sidLabelIndex);
75 bitFlags.toByteBuf(buffer);
76 buffer.writeByte(algorithm.getIntValue());
77 buffer.writeZero(RESERVED_PREFIX);
78 buffer.writeBytes(SidLabelIndexParser.serializeSidValue(sidLabelIndex));
81 private static BitArray serializePrefixFlags(final Flags flags, final SidLabelIndex sidLabelIndex) {
82 final BitArray bitFlags = new BitArray(FLAGS_SIZE);
83 SidLabelIndexParser.setFlags(sidLabelIndex, bitFlags, VALUE, LOCAL);
84 if (flags instanceof OspfPrefixFlagsCase) {
85 final OspfPrefixFlagsCase ospfFlags = (OspfPrefixFlagsCase) flags;
86 bitFlags.set(NO_PHP_OSPF, ospfFlags.isNoPhp());
87 bitFlags.set(MAPPING_SERVER, ospfFlags.isMappingServer());
88 bitFlags.set(EXPLICIT_NULL, ospfFlags.isExplicitNull());
89 } else if (flags instanceof IsisPrefixFlagsCase) {
90 final IsisPrefixFlagsCase isisFlags = (IsisPrefixFlagsCase) flags;
91 bitFlags.set(RE_ADVERTISEMENT, isisFlags.isReadvertisement());
92 bitFlags.set(NODE_SID, isisFlags.isNodeSid());
93 bitFlags.set(NO_PHP, isisFlags.isNoPhp());
94 bitFlags.set(EXPLICIT_NULL, isisFlags.isExplicitNull());