/* * 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()); } }