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
9 package org.opendaylight.protocol.bgp.labeled.unicast;
11 import com.google.common.base.Preconditions;
12 import io.netty.buffer.ByteBuf;
13 import io.netty.buffer.Unpooled;
14 import java.util.ArrayList;
15 import java.util.Arrays;
16 import java.util.List;
17 import javax.annotation.Nonnull;
18 import javax.annotation.Nullable;
19 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
20 import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
21 import org.opendaylight.protocol.bgp.parser.spi.MultiPathSupportUtil;
22 import org.opendaylight.protocol.bgp.parser.spi.NlriParser;
23 import org.opendaylight.protocol.bgp.parser.spi.NlriSerializer;
24 import org.opendaylight.protocol.bgp.parser.spi.PathIdUtil;
25 import org.opendaylight.protocol.bgp.parser.spi.PeerSpecificParserConstraint;
26 import org.opendaylight.protocol.util.ByteArray;
27 import org.opendaylight.protocol.util.Ipv4Util;
28 import org.opendaylight.protocol.util.Ipv6Util;
29 import org.opendaylight.protocol.util.MplsLabelUtil;
30 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpPrefix;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.labeled.unicast.LabelStack;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.labeled.unicast.LabelStackBuilder;
33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.labeled.unicast.destination.CLabeledUnicastDestination;
34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.labeled.unicast.destination.CLabeledUnicastDestinationBuilder;
35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationLabeledUnicastCaseBuilder;
36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.update.attributes.mp.reach.nlri.advertized.routes.destination.type.destination.labeled.unicast._case.DestinationLabeledUnicastBuilder;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationLabeledUnicastCase;
38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.Attributes;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.Attributes1;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.Attributes2;
41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpReachNlriBuilder;
42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpUnreachNlri;
43 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpUnreachNlriBuilder;
44 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.mp.reach.nlri.AdvertizedRoutes;
45 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.mp.reach.nlri.AdvertizedRoutesBuilder;
46 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.mp.unreach.nlri.WithdrawnRoutesBuilder;
47 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
48 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.Ipv4AddressFamily;
49 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.Ipv6AddressFamily;
50 import org.opendaylight.yangtools.yang.binding.DataObject;
52 public class LUNlriParser implements NlriParser, NlriSerializer {
54 public static final int LABEL_LENGTH = 3;
57 public void serializeAttribute(final DataObject attribute, final ByteBuf byteAggregator) {
58 Preconditions.checkArgument(attribute instanceof Attributes, "Attribute parameter is not a Attributes object");
59 final Attributes pathAttributes = (Attributes) attribute;
60 final Attributes1 pathAttributes1 = pathAttributes.getAugmentation(Attributes1.class);
61 final Attributes2 pathAttributes2 = pathAttributes.getAugmentation(Attributes2.class);
62 if (pathAttributes1 != null) {
63 final AdvertizedRoutes routes = (pathAttributes1.getMpReachNlri()).getAdvertizedRoutes();
64 if ((routes != null) && (routes.getDestinationType() instanceof org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationLabeledUnicastCase)) {
65 final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationLabeledUnicastCase labeledUnicastCase = (org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationLabeledUnicastCase) routes.getDestinationType();
66 serializeNlri(labeledUnicastCase.getDestinationLabeledUnicast().getCLabeledUnicastDestination(), byteAggregator);
68 } else if (pathAttributes2 != null) {
69 final MpUnreachNlri mpUnreachNlri = pathAttributes2.getMpUnreachNlri();
70 if ((mpUnreachNlri.getWithdrawnRoutes() != null) && (mpUnreachNlri.getWithdrawnRoutes().getDestinationType() instanceof DestinationLabeledUnicastCase)) {
71 final DestinationLabeledUnicastCase labeledUnicastCase = (DestinationLabeledUnicastCase) mpUnreachNlri.getWithdrawnRoutes().getDestinationType();
72 serializeNlri(labeledUnicastCase.getDestinationLabeledUnicast().getCLabeledUnicastDestination(), byteAggregator);
77 protected static void serializeNlri(final List<CLabeledUnicastDestination> dests, final ByteBuf buffer) {
78 final ByteBuf nlriByteBuf = Unpooled.buffer();
79 for (final CLabeledUnicastDestination dest: dests) {
80 PathIdUtil.writePathId(dest.getPathId(), buffer);
82 final List<LabelStack> labelStack = dest.getLabelStack();
83 final IpPrefix prefix = dest.getPrefix();
84 // Serialize the length field
85 // Length field contains one Byte which represents the length of label stack and prefix in bits
86 nlriByteBuf.writeByte(((LABEL_LENGTH * labelStack.size()) + getPrefixLength(prefix)) * Byte.SIZE);
88 serializeLabelStackEntries(labelStack, nlriByteBuf);
89 serializePrefixField(prefix, nlriByteBuf);
91 buffer.writeBytes(nlriByteBuf);
94 public static void serializeLabelStackEntries(final List<LabelStack> stack, final ByteBuf buffer) {
96 for (final LabelStack labelStackEntry : stack) {
97 if (i++ == stack.size()) {
98 //mark last label stack entry with bottom-bit
99 buffer.writeBytes(MplsLabelUtil.byteBufForMplsLabelWithBottomBit(labelStackEntry.getLabelValue()));
101 buffer.writeBytes(MplsLabelUtil.byteBufForMplsLabel(labelStackEntry.getLabelValue()));
106 public static void serializePrefixField(final IpPrefix prefix, final ByteBuf buffer) {
107 final byte[] prefixBytes = getPrefixBytes(prefix);
108 buffer.writeBytes(Arrays.copyOfRange(prefixBytes, 1, prefixBytes.length));
111 public static int getPrefixLength(final IpPrefix prefix) {
112 if (prefix.getIpv4Prefix() != null) {
113 return Ipv4Util.getPrefixLengthBytes(prefix.getIpv4Prefix().getValue());
115 return Ipv4Util.getPrefixLengthBytes(prefix.getIpv6Prefix().getValue());
118 private static byte[] getPrefixBytes(final IpPrefix prefix) {
119 if (prefix.getIpv4Prefix() != null) {
120 return Ipv4Util.bytesForPrefixBegin(prefix.getIpv4Prefix());
122 return Ipv6Util.bytesForPrefixBegin(prefix.getIpv6Prefix());
126 public void parseNlri(final ByteBuf nlri, final MpUnreachNlriBuilder builder) throws BGPParsingException {
127 parseNlri(nlri, builder, null);
130 private static List<CLabeledUnicastDestination> parseNlri(final ByteBuf nlri, final Class<? extends AddressFamily> afi, final boolean mPathSupported) {
131 if (!nlri.isReadable()) {
134 final List<CLabeledUnicastDestination> dests = new ArrayList<>();
136 while (nlri.isReadable()) {
137 final CLabeledUnicastDestinationBuilder builder = new CLabeledUnicastDestinationBuilder();
138 if (mPathSupported) {
139 builder.setPathId(PathIdUtil.readPathId(nlri));
141 final short length = nlri.readUnsignedByte();
142 builder.setLabelStack(parseLabel(nlri));
143 final int labelNum = builder.getLabelStack().size();
144 final int prefixLen = length - (LABEL_LENGTH * Byte.SIZE * labelNum);
145 builder.setPrefix(parseIpPrefix(nlri, prefixLen, afi));
146 dests.add(builder.build());
151 public static IpPrefix parseIpPrefix(final ByteBuf nlri, final int prefixLen, final Class<? extends AddressFamily> afi) {
152 final int prefixLenInByte = (prefixLen / Byte.SIZE) + (((prefixLen % Byte.SIZE) == 0) ? 0 : 1);
153 if (afi.equals(Ipv4AddressFamily.class)) {
154 return new IpPrefix(Ipv4Util.prefixForBytes(ByteArray.readBytes(nlri, prefixLenInByte), prefixLen));
155 } else if (afi.equals(Ipv6AddressFamily.class)) {
156 return new IpPrefix(Ipv6Util.prefixForBytes(ByteArray.readBytes(nlri, prefixLenInByte), prefixLen));
161 public static List<LabelStack> parseLabel(final ByteBuf nlri) {
162 if (!nlri.isReadable()) {
165 final List<LabelStack> labels = new ArrayList<>();
166 boolean bottomBit = false;
168 final ByteBuf slice = nlri.readSlice(LABEL_LENGTH);
169 bottomBit = MplsLabelUtil.getBottomBit(slice);
170 labels.add(new LabelStackBuilder().setLabelValue(MplsLabelUtil.mplsLabelForByteBuf(slice)).build());
171 } while (!bottomBit);
176 public void parseNlri(final ByteBuf nlri, final MpReachNlriBuilder builder) throws BGPParsingException {
177 parseNlri(nlri, builder, null);
181 public void parseNlri(@Nonnull final ByteBuf nlri, @Nonnull final MpReachNlriBuilder builder, @Nullable final PeerSpecificParserConstraint constraint) throws BGPParsingException {
182 if (!nlri.isReadable()) {
185 final boolean mPathSupported = MultiPathSupportUtil.isTableTypeSupported(constraint, new BgpTableTypeImpl(builder.getAfi(), builder.getSafi()));
186 final List<CLabeledUnicastDestination> dst = parseNlri(nlri, builder.getAfi(), mPathSupported);
188 builder.setAdvertizedRoutes(new AdvertizedRoutesBuilder().setDestinationType(
189 new DestinationLabeledUnicastCaseBuilder().setDestinationLabeledUnicast(
190 new DestinationLabeledUnicastBuilder().setCLabeledUnicastDestination(
191 dst).build()).build()).build());
195 public void parseNlri(@Nonnull final ByteBuf nlri, @Nonnull final MpUnreachNlriBuilder builder, @Nullable final PeerSpecificParserConstraint constraint) throws BGPParsingException {
196 if (!nlri.isReadable()) {
199 final boolean mPathSupported = MultiPathSupportUtil.isTableTypeSupported(constraint, new BgpTableTypeImpl(builder.getAfi(), builder.getSafi()));
200 final List<CLabeledUnicastDestination> dst = parseNlri(nlri, builder.getAfi(), mPathSupported);
202 builder.setWithdrawnRoutes(new WithdrawnRoutesBuilder().setDestinationType(
203 new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationLabeledUnicastCaseBuilder().setDestinationLabeledUnicast(
204 new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev150525.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.destination.labeled.unicast._case.DestinationLabeledUnicastBuilder().setCLabeledUnicastDestination(
205 dst).build()).build()).build());