bgp/bmp-spi/src/main/java/org/opendaylight/protocol/bmp/spi/parser/AbstractBmpPerPeerMessageParser.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
   9 package org.opendaylight.protocol.bmp.spi.parser;
  10
  11 import static java.util.Objects.requireNonNull;
  12
  13 import com.google.common.base.Preconditions;
  14 import io.netty.buffer.ByteBuf;
  15 import org.opendaylight.bgp.concepts.RouteDistinguisherUtil;
  16 import org.opendaylight.protocol.bgp.parser.spi.MessageRegistry;
  17 import org.opendaylight.protocol.util.BitArray;
  18 import org.opendaylight.protocol.util.ByteArray;
  19 import org.opendaylight.protocol.util.ByteBufWriteUtil;
  20 import org.opendaylight.protocol.util.Ipv4Util;
  21 import org.opendaylight.protocol.util.Ipv6Util;
  22 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.AsNumber;
  23 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  24 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.Timestamp;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bmp.message.rev150512.AdjRibInType;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bmp.message.rev150512.Peer.PeerDistinguisher;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bmp.message.rev150512.PeerType;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bmp.message.rev150512.peer.header.PeerHeader;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bmp.message.rev150512.peer.header.PeerHeaderBuilder;
  30 import org.opendaylight.yangtools.concepts.Builder;
  31 import org.opendaylight.yangtools.yang.binding.Notification;
  32
  33 public abstract class AbstractBmpPerPeerMessageParser<T  extends Builder<?>> extends AbstractBmpMessageWithTlvParser<T> {
  34
  35     private static final int L_FLAG_POS = 1;
  36     private static final int V_FLAG_POS = 0;
  37     private static final int FLAGS_SIZE = 8;
  38     private static final int PEER_DISTINGUISHER_SIZE = 8;
  39     private static final int PER_PEER_HEADER_SIZE = 32;
  40
  41     private final MessageRegistry bgpMssageRegistry;
  42
  43     public AbstractBmpPerPeerMessageParser(final MessageRegistry bgpMssageRegistry) {
  44         this(bgpMssageRegistry, null);
  45     }
  46
  47     public AbstractBmpPerPeerMessageParser(final MessageRegistry bgpMssageRegistry, final BmpTlvRegistry tlvRegistry) {
  48         super(tlvRegistry);
  49         this.bgpMssageRegistry = requireNonNull(bgpMssageRegistry);
  50     }
  51
  52     @Override
  53     public void serializeMessageBody(final Notification message, final ByteBuf buffer) {
  54         if (message instanceof org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bmp.message.rev150512.PeerHeader) {
  55             final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bmp.message.rev150512.PeerHeader messageWithPerPeerHeader =
  56                 (org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bmp.message.rev150512.PeerHeader) message;
  57             serializePerPeerHeader(messageWithPerPeerHeader.getPeerHeader(), buffer);
  58         }
  59     }
  60
  61     protected static final PeerHeader parsePerPeerHeader(final ByteBuf bytes) {
  62         Preconditions.checkArgument(bytes.readableBytes() >= PER_PEER_HEADER_SIZE);
  63         final PeerHeaderBuilder phBuilder = new PeerHeaderBuilder();
  64         final PeerType peerType = PeerType.forValue(bytes.readByte());
  65         phBuilder.setType(peerType);
  66         final BitArray flags = BitArray.valueOf(bytes, FLAGS_SIZE);
  67         phBuilder.setAdjRibInType(AdjRibInType.forValue(flags.get(L_FLAG_POS) ? 1 : 0));
  68         phBuilder.setIpv4(!flags.get(V_FLAG_POS));
  69         switch (peerType) {
  70         case L3vpn:
  71             phBuilder.setDistinguisher(PeerDistinguisherUtil.parsePeerDistingisher(bytes.slice()));
  72             phBuilder.setPeerDistinguisher(new PeerDistinguisher(RouteDistinguisherUtil.parseRouteDistinguisher(bytes)));
  73             break;
  74         case Local:
  75             phBuilder.setPeerDistinguisher(new PeerDistinguisher(ByteArray.readBytes(bytes, PEER_DISTINGUISHER_SIZE)));
  76             break;
  77         case Global:
  78         default:
  79             bytes.skipBytes(PEER_DISTINGUISHER_SIZE);
  80             break;
  81         }
  82         if (phBuilder.isIpv4()) {
  83             bytes.skipBytes(Ipv6Util.IPV6_LENGTH - Ipv4Util.IP4_LENGTH);
  84             phBuilder.setAddress(new IpAddress(Ipv4Util.addressForByteBuf(bytes)));
  85         } else {
  86             phBuilder.setAddress(new IpAddress(Ipv6Util.addressForByteBuf(bytes)));
  87         }
  88         phBuilder.setAs(new AsNumber(bytes.readUnsignedInt()));
  89         phBuilder.setBgpId(Ipv4Util.addressForByteBuf(bytes));
  90         phBuilder.setTimestampSec(new Timestamp(bytes.readUnsignedInt()));
  91         phBuilder.setTimestampMicro(new Timestamp(bytes.readUnsignedInt()));
  92         return phBuilder.build();
  93     }
  94
  95     protected void serializePerPeerHeader(final PeerHeader peerHeader, final ByteBuf output) {
  96         Preconditions.checkArgument(peerHeader != null, "Per-peer header cannot be null.");
  97         final PeerType peerType = peerHeader.getType();
  98         output.writeByte(peerType.getIntValue());
  99         final BitArray flags = new BitArray(FLAGS_SIZE);
 100         flags.set(L_FLAG_POS, peerHeader.getAdjRibInType().getIntValue() == 0 ? false : true);
 101         flags.set(V_FLAG_POS, !peerHeader.isIpv4());
 102         flags.toByteBuf(output);
 103         final PeerDistinguisher peerDistinguisher = peerHeader.getPeerDistinguisher();
 104         switch (peerType) {
 105         case L3vpn:
 106             if (peerDistinguisher.getRouteDistinguisher() != null) {
 107                 RouteDistinguisherUtil.serializeRouteDistinquisher(peerDistinguisher.getRouteDistinguisher(), output);
 108             } else {
 109                 PeerDistinguisherUtil.serializePeerDistinguisher(peerHeader.getDistinguisher(), output);
 110             }
 111             break;
 112         case Local:
 113             output.writeBytes(peerDistinguisher.getBinary());
 114             break;
 115         case Global:
 116         default:
 117             output.writeZero(PEER_DISTINGUISHER_SIZE);
 118             break;
 119         }
 120         if (peerHeader.isIpv4()) {
 121             output.writeZero(Ipv6Util.IPV6_LENGTH - Ipv4Util.IP4_LENGTH);
 122             ByteBufWriteUtil.writeIpv4Address(peerHeader.getAddress().getIpv4Address(), output);
 123         } else {
 124             ByteBufWriteUtil.writeIpv6Address(peerHeader.getAddress().getIpv6Address(), output);
 125         }
 126         ByteBufWriteUtil.writeUnsignedInt(peerHeader.getAs().getValue(), output);
 127         ByteBufWriteUtil.writeIpv4Address(peerHeader.getBgpId(), output);
 128         if (peerHeader.getTimestampSec() != null) {
 129             ByteBufWriteUtil.writeUnsignedInt(peerHeader.getTimestampSec().getValue(), output);
 130         } else {
 131             output.writeZero(ByteBufWriteUtil.INT_BYTES_LENGTH);
 132         }
 133         if (peerHeader.getTimestampMicro() != null) {
 134             ByteBufWriteUtil.writeUnsignedInt(peerHeader.getTimestampMicro().getValue(), output);
 135         } else {
 136             output.writeZero(ByteBufWriteUtil.INT_BYTES_LENGTH);
 137         }
 138     }
 139
 140     protected final MessageRegistry getBgpMessageRegistry() {
 141         return this.bgpMssageRegistry;
 142     }
 143 }