| /* |
| * Copyright 2015-present Open Networking Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.onosproject.bgpio.protocol.ver4; |
| |
| import com.google.common.base.MoreObjects; |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.onosproject.bgpio.exceptions.BgpParseException; |
| import org.onosproject.bgpio.protocol.BgpType; |
| import org.onosproject.bgpio.types.BgpHeader; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.onosproject.bgpio.protocol.BgpRouteRefreshMsg; |
| import org.onosproject.bgpio.protocol.BgpMessageReader; |
| import org.onosproject.bgpio.protocol.BgpMessageWriter; |
| import org.onosproject.bgpio.protocol.BgpVersion; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| /** |
| * Provides BGP Route Refresh message. |
| */ |
| public class BgpRouteRefreshMsgVer4 implements BgpRouteRefreshMsg { |
| |
| /* |
| <Route Refresh Message>::= |
| |
| 0 1 2 3 |
| 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | | |
| + + |
| | | |
| + + |
| | Marker | |
| + + |
| | | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | Length | Type | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | AFI | Reserved | SAFI | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| |
| REFERENCE : RFC 2918 |
| */ |
| |
| private static final Logger log = LoggerFactory.getLogger(BgpRouteRefreshMsgVer4.class); |
| |
| public static final byte PACKET_VERSION = 4; |
| public static final int PACKET_LENGTH = 0x17; |
| public static final int MARKER_LENGTH = 16; |
| public static final BgpType MSG_TYPE = BgpType.ROUTE_REFRESH; |
| private static final byte[] MARKER = new byte[]{(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, |
| (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, |
| (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, |
| (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff}; |
| |
| private static final BgpHeader DEFAULT_ROUTEREFRESH_HEADER = new BgpHeader(MARKER, |
| (short) PACKET_LENGTH, BgpType.ROUTE_REFRESH.getType()); |
| |
| private BgpHeader bgpMsgHeader; |
| private byte version; |
| private List<AfiSafiValue> afiSafiValues; |
| |
| public static final BgpRouteRefreshMsgVer4.Reader READER = new Reader(); |
| |
| /** |
| * Reader class for reading BGP route refresh message from channel buffer. |
| */ |
| static class Reader implements BgpMessageReader<BgpRouteRefreshMsg> { |
| |
| @Override |
| public BgpRouteRefreshMsgVer4 readFrom(ChannelBuffer cb, BgpHeader bgpHeader) |
| throws BgpParseException { |
| |
| Short afi = cb.readShort(); |
| log.debug("AFI read from Route Refresh message = {}", afi); |
| |
| byte reserved = cb.readByte(); |
| log.debug("Reserved read from Route Refresh message = {}", reserved); |
| |
| byte safi = cb.readByte(); |
| log.debug("SAFI read from Route Refresh message = {}", safi); |
| |
| List<AfiSafiValue> afiSafiList = new LinkedList<>(); |
| |
| AfiSafiValue afisafiValue = new AfiSafiValue(afi, reserved, safi); |
| afiSafiList.add(afisafiValue); |
| |
| return new BgpRouteRefreshMsgVer4(DEFAULT_ROUTEREFRESH_HEADER, PACKET_VERSION, afiSafiList); |
| } |
| } |
| |
| /** |
| * Default constructor. |
| */ |
| public BgpRouteRefreshMsgVer4() { |
| this.bgpMsgHeader = null; |
| this.version = 0; |
| this.afiSafiValues = null; |
| } |
| |
| public BgpRouteRefreshMsgVer4(BgpHeader msgHeader, byte version, List<AfiSafiValue> afiSafiValues) { |
| this.bgpMsgHeader = msgHeader; |
| this.version = version; |
| this.afiSafiValues = afiSafiValues; |
| } |
| |
| /** |
| * Builder class for BGP route refresh message. |
| */ |
| static class Builder implements BgpRouteRefreshMsg.Builder { |
| BgpHeader bgpHeader = null; |
| boolean isHeaderSet = false; |
| List<AfiSafiValue> afiSafiList = null; |
| |
| @Override |
| public Builder setHeader(BgpHeader bgpMsgHeader) { |
| this.bgpHeader = bgpMsgHeader; |
| this.isHeaderSet = true; |
| return this; |
| } |
| |
| @Override |
| public BgpRouteRefreshMsg.Builder addAfiSafiValue(short afi, byte reserved, byte safi) { |
| if (afiSafiList == null) { |
| afiSafiList = new LinkedList<>(); |
| } |
| AfiSafiValue currentElement = new AfiSafiValue(afi, reserved, safi); |
| afiSafiList.add(currentElement); |
| return this; |
| } |
| |
| @Override |
| public BgpRouteRefreshMsg build() { |
| BgpHeader header = isHeaderSet ? bgpHeader : DEFAULT_ROUTEREFRESH_HEADER; |
| return new BgpRouteRefreshMsgVer4(header, PACKET_VERSION, afiSafiList); |
| } |
| } |
| |
| @Override |
| public void writeTo(ChannelBuffer cb) { |
| WRITER.write(cb, this); |
| } |
| |
| static final Writer WRITER = new Writer(); |
| |
| /** |
| * Writer class for writing the BGP route refresh message to channel buffer. |
| */ |
| static class Writer implements BgpMessageWriter<BgpRouteRefreshMsgVer4> { |
| |
| @Override |
| public void write(ChannelBuffer cb, BgpRouteRefreshMsgVer4 message) { |
| //Iterate over the added AFI-SAFI pair and write a new packet for each of those |
| |
| for (AfiSafiValue element : message.afiSafiValues) { |
| cb.writeBytes(MARKER, 0, MARKER_LENGTH); |
| cb.writeShort(PACKET_LENGTH); |
| cb.writeByte(MSG_TYPE.getType()); |
| |
| cb.writeShort(element.afi); |
| cb.writeByte(element.reserved); |
| cb.writeByte(element.safi); |
| } |
| } |
| } |
| |
| @Override |
| public BgpVersion getVersion() { |
| return BgpVersion.BGP_4; |
| } |
| |
| @Override |
| public BgpType getType() { |
| return MSG_TYPE; |
| } |
| |
| @Override |
| public BgpHeader getHeader() { |
| return this.bgpMsgHeader; |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()).toString(); |
| } |
| } |
| |
| final class AfiSafiValue { |
| final short afi; |
| final byte reserved; |
| final byte safi; |
| |
| public AfiSafiValue(short afi, byte reserved, byte safi) { |
| this.afi = afi; |
| this.reserved = reserved; |
| this.safi = safi; |
| } |
| } |