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org.opendaylight.protocol.bgp.labeled.unicast.LUNlriParser Maven / Gradle / Ivy
/*
* Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.protocol.bgp.labeled.unicast;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.opendaylight.protocol.bgp.parser.BGPParsingException;
import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
import org.opendaylight.protocol.bgp.parser.spi.MultiPathSupportUtil;
import org.opendaylight.protocol.bgp.parser.spi.NlriParser;
import org.opendaylight.protocol.bgp.parser.spi.NlriSerializer;
import org.opendaylight.protocol.bgp.parser.spi.PathIdUtil;
import org.opendaylight.protocol.bgp.parser.spi.PeerSpecificParserConstraint;
import org.opendaylight.protocol.util.ByteArray;
import org.opendaylight.protocol.util.Ipv4Util;
import org.opendaylight.protocol.util.Ipv6Util;
import org.opendaylight.protocol.util.MplsLabelUtil;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.labeled.unicast.LabelStack;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.labeled.unicast.LabelStackBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.labeled.unicast.destination.CLabeledUnicastDestination;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.labeled.unicast.destination.CLabeledUnicastDestinationBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationIpv6LabeledUnicastCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationLabeledUnicastCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.update.attributes.mp.reach.nlri.advertized.routes.destination.type.destination.ipv6.labeled.unicast._case.DestinationIpv6LabeledUnicastBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.update.attributes.mp.reach.nlri.advertized.routes.destination.type.destination.labeled.unicast._case.DestinationLabeledUnicastBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationIpv6LabeledUnicastCase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast.rev180329.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationLabeledUnicastCase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev200120.path.attributes.Attributes;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.AttributesReach;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.AttributesUnreach;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.reach.MpReachNlriBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.reach.mp.reach.nlri.AdvertizedRoutes;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.reach.mp.reach.nlri.AdvertizedRoutesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.unreach.MpUnreachNlri;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.unreach.MpUnreachNlriBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.unreach.mp.unreach.nlri.WithdrawnRoutes;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.attributes.unreach.mp.unreach.nlri.WithdrawnRoutesBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev180329.destination.DestinationType;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.AddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.Ipv4AddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev200120.Ipv6AddressFamily;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.network.concepts.rev131125.MplsLabel;
public class LUNlriParser implements NlriParser, NlriSerializer {
public static final int LABEL_LENGTH = 3;
private static final byte[] WITHDRAW_LABEL_BYTE_ARRAY = { (byte) 0x80, (byte) 0x00, (byte) 0x00 };
private static final int WITHDRAW_LABEL_INT_VALUE = 0x800000;
@Override
public void serializeAttribute(final Attributes pathAttributes, final ByteBuf byteAggregator) {
final AttributesReach pathAttributes1 = pathAttributes.augmentation(AttributesReach.class);
final AttributesUnreach pathAttributes2 = pathAttributes.augmentation(AttributesUnreach.class);
if (pathAttributes1 != null) {
final AdvertizedRoutes routes = pathAttributes1.getMpReachNlri().getAdvertizedRoutes();
if (routes != null) {
final DestinationType destinationType = routes.getDestinationType();
if (destinationType
instanceof org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp
.labeled.unicast.rev180329.update.attributes.mp.reach.nlri.advertized.routes.destination.type
.DestinationLabeledUnicastCase labeledUnicastCase) {
serializeNlri(labeledUnicastCase.getDestinationLabeledUnicast().getCLabeledUnicastDestination(),
false, byteAggregator);
} else if (destinationType
instanceof org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang
.bgp.labeled.unicast.rev180329.update.attributes.mp.reach.nlri.advertized.routes.destination
.type.DestinationIpv6LabeledUnicastCase labeledUnicastCase) {
serializeNlri(labeledUnicastCase.getDestinationIpv6LabeledUnicast().getCLabeledUnicastDestination(),
false, byteAggregator);
}
}
} else if (pathAttributes2 != null) {
final MpUnreachNlri mpUnreachNlri = pathAttributes2.getMpUnreachNlri();
final WithdrawnRoutes withDrawnRoutes = mpUnreachNlri.getWithdrawnRoutes();
if (withDrawnRoutes != null) {
final DestinationType destinationType = withDrawnRoutes.getDestinationType();
if (destinationType instanceof DestinationLabeledUnicastCase labeledUnicastCase) {
serializeNlri(labeledUnicastCase.getDestinationLabeledUnicast().getCLabeledUnicastDestination(),
true, byteAggregator);
} else if (destinationType instanceof DestinationIpv6LabeledUnicastCase labeledUnicastCase) {
serializeNlri(labeledUnicastCase.getDestinationIpv6LabeledUnicast().getCLabeledUnicastDestination(),
true, byteAggregator);
}
}
}
}
protected static void serializeNlri(final List dests, final boolean isUnreachNlri,
final ByteBuf buffer) {
final ByteBuf nlriByteBuf = Unpooled.buffer();
for (final CLabeledUnicastDestination dest : dests) {
PathIdUtil.writePathId(dest.getPathId(), buffer);
final List labelStack = dest.getLabelStack();
final IpPrefix prefix = dest.getPrefix();
// Serialize the length field
// Length field contains one Byte which represents the length of label stack and prefix in bits
nlriByteBuf.writeByte((LABEL_LENGTH * (!isUnreachNlri ? labelStack.size() : 1)
+ getPrefixLength(prefix)) * Byte.SIZE);
serializeLabelStackEntries(labelStack, isUnreachNlri, nlriByteBuf);
serializePrefixField(prefix, nlriByteBuf);
}
buffer.writeBytes(nlriByteBuf);
}
public static void serializeLabelStackEntries(final List stack, final boolean isUnreachNlri,
final ByteBuf buffer) {
if (!isUnreachNlri) {
int entry = 1;
for (final LabelStack labelStackEntry : stack) {
if (entry++ == stack.size()) {
// mark last label stack entry with bottom-bit
buffer.writeBytes(MplsLabelUtil.byteBufForMplsLabelWithBottomBit(labelStackEntry.getLabelValue()));
} else {
buffer.writeBytes(MplsLabelUtil.byteBufForMplsLabel(labelStackEntry.getLabelValue()));
}
}
} else {
buffer.writeBytes(WITHDRAW_LABEL_BYTE_ARRAY);
}
}
public static void serializePrefixField(final IpPrefix prefix, final ByteBuf buffer) {
final byte[] prefixBytes = getPrefixBytes(prefix);
buffer.writeBytes(Arrays.copyOfRange(prefixBytes, 1, prefixBytes.length));
}
public static int getPrefixLength(final IpPrefix prefix) {
if (prefix.getIpv4Prefix() != null) {
return Ipv4Util.getPrefixLengthBytes(prefix.getIpv4Prefix().getValue());
}
return Ipv4Util.getPrefixLengthBytes(prefix.getIpv6Prefix().getValue());
}
private static byte[] getPrefixBytes(final IpPrefix prefix) {
final ByteBuf buffer = Unpooled.buffer();
if (prefix.getIpv4Prefix() != null) {
Ipv4Util.writeMinimalPrefix(prefix.getIpv4Prefix(), buffer);
} else {
Ipv6Util.writeMinimalPrefix(prefix.getIpv6Prefix(), buffer);
}
return ByteArray.readAllBytes(buffer);
}
public static IpPrefix parseIpPrefix(final ByteBuf nlri, final int prefixLen, final AddressFamily afi) {
final int prefixLenInByte = prefixLen / Byte.SIZE + (prefixLen % Byte.SIZE == 0 ? 0 : 1);
if (afi.equals(Ipv4AddressFamily.VALUE)) {
return new IpPrefix(Ipv4Util.prefixForBytes(ByteArray.readBytes(nlri, prefixLenInByte), prefixLen));
} else if (afi.equals(Ipv6AddressFamily.VALUE)) {
return new IpPrefix(Ipv6Util.prefixForBytes(ByteArray.readBytes(nlri, prefixLenInByte), prefixLen));
}
return null;
}
public static List parseLabel(final ByteBuf nlri) {
if (!nlri.isReadable()) {
return null;
}
final List labels = new ArrayList<>();
boolean bottomBit;
do {
final ByteBuf slice = nlri.readSlice(LABEL_LENGTH);
bottomBit = MplsLabelUtil.getBottomBit(slice);
final MplsLabel mplsLabel = MplsLabelUtil.mplsLabelForByteBuf(slice);
if (MplsLabelUtil.intForMplsLabel(mplsLabel) == WITHDRAW_LABEL_INT_VALUE) {
return null;
}
labels.add(new LabelStackBuilder().setLabelValue(mplsLabel).build());
} while (!bottomBit);
return labels;
}
private static List parseNlri(final ByteBuf nlri, final AddressFamily afi,
final boolean multiPathSupported) {
if (!nlri.isReadable()) {
return null;
}
final List dests = new ArrayList<>();
while (nlri.isReadable()) {
final CLabeledUnicastDestinationBuilder builder = new CLabeledUnicastDestinationBuilder();
if (multiPathSupported) {
builder.setPathId(PathIdUtil.readPathId(nlri));
}
final short length = nlri.readUnsignedByte();
final List labels = parseLabel(nlri);
builder.setLabelStack(labels);
final int labelNum = labels != null ? labels.size() : 1;
final int prefixLen = length - LABEL_LENGTH * Byte.SIZE * labelNum;
builder.setPrefix(parseIpPrefix(nlri, prefixLen, afi));
dests.add(builder.build());
}
return dests;
}
@Override
public void parseNlri(final ByteBuf nlri, final MpReachNlriBuilder builder,
final PeerSpecificParserConstraint constraint) throws BGPParsingException {
if (!nlri.isReadable()) {
return;
}
final AddressFamily afi = builder.getAfi();
final boolean multiPathSupported = MultiPathSupportUtil.isTableTypeSupported(constraint,
new BgpTableTypeImpl(builder.getAfi(), builder.getSafi()));
final List dst = parseNlri(nlri, afi, multiPathSupported);
DestinationType destination = null;
if (afi.equals(Ipv4AddressFamily.VALUE)) {
destination = new DestinationLabeledUnicastCaseBuilder().setDestinationLabeledUnicast(
new DestinationLabeledUnicastBuilder().setCLabeledUnicastDestination(dst).build()).build();
} else if (afi.equals(Ipv6AddressFamily.VALUE)) {
destination = new DestinationIpv6LabeledUnicastCaseBuilder().setDestinationIpv6LabeledUnicast(
new DestinationIpv6LabeledUnicastBuilder()
.setCLabeledUnicastDestination(dst).build()).build();
}
builder.setAdvertizedRoutes(new AdvertizedRoutesBuilder().setDestinationType(destination).build());
}
@Override
public void parseNlri(final ByteBuf nlri, final MpUnreachNlriBuilder builder,
final PeerSpecificParserConstraint constraint) throws BGPParsingException {
if (!nlri.isReadable()) {
return;
}
final AddressFamily afi = builder.getAfi();
final boolean mPathSupported = MultiPathSupportUtil.isTableTypeSupported(constraint,
new BgpTableTypeImpl(builder.getAfi(), builder.getSafi()));
final List dst = parseNlri(nlri, afi, mPathSupported);
DestinationType destination = null;
if (afi.equals(Ipv4AddressFamily.VALUE)) {
destination = new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast
.rev180329.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type
.DestinationLabeledUnicastCaseBuilder().setDestinationLabeledUnicast(
new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast
.rev180329.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.destination
.labeled.unicast._case.DestinationLabeledUnicastBuilder()
.setCLabeledUnicastDestination(dst).build()).build();
} else if (afi.equals(Ipv6AddressFamily.VALUE)) {
destination = new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast
.rev180329.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type
.DestinationIpv6LabeledUnicastCaseBuilder().setDestinationIpv6LabeledUnicast(
new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.labeled.unicast
.rev180329.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.destination.ipv6
.labeled.unicast._case.DestinationIpv6LabeledUnicastBuilder()
.setCLabeledUnicastDestination(dst).build()).build();
}
builder.setWithdrawnRoutes(new WithdrawnRoutesBuilder().setDestinationType(destination).build());
}
}
