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/*
* Copyright 2015 Open Networking Laboratory
*
* 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.linkstate;
import java.util.LinkedList;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onosproject.bgpio.exceptions.BGPParseException;
import org.onosproject.bgpio.protocol.BGPPrefixLSNlri;
import org.onosproject.bgpio.protocol.NlriType;
import org.onosproject.bgpio.protocol.linkstate.BGPNodeLSNlriVer4.PROTOCOLTYPE;
import org.onosproject.bgpio.types.BGPValueType;
import org.onosproject.bgpio.types.RouteDistinguisher;
import org.onosproject.bgpio.util.Constants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
/**
* Implementation of Prefix IPV4 LS NLRI.
*/
public class BGPPrefixIPv4LSNlriVer4 implements BGPPrefixLSNlri {
/*
* REFERENCE : draft-ietf-idr-ls-distribution-11
* 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
+-+-+-+-+-+-+-+-+
| Protocol-ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Identifier |
| (64 bits) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// Local Node Descriptor (variable) //
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// Prefix Descriptors (variable) //
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure : The IPv4/IPv6 Topology Prefix NLRI format
*/
protected static final Logger log = LoggerFactory.getLogger(BGPPrefixIPv4LSNlriVer4.class);
public static final int PREFIX_IPV4_NLRITYPE = 3;
public static final int IDENTIFIER_LENGTH = 16;
private long identifier;
private byte protocolId;
private RouteDistinguisher routeDistinguisher;
private boolean isVpn;
private BGPPrefixLSIdentifier bgpPrefixLSIdentifier;
/**
* Resets parameters.
*/
public BGPPrefixIPv4LSNlriVer4() {
this.identifier = 0;
this.protocolId = 0;
this.bgpPrefixLSIdentifier = null;
this.routeDistinguisher = null;
this.isVpn = false;
}
/**
* Constructor to initialize parameters for BGP PrefixLSNlri.
*
* @param identifier field in BGP PrefixLSNlri
* @param protocolId protocol Id
* @param bgpPrefixLSIdentifier prefix LS Identifier
* @param routeDistinguisher RouteDistinguisher
* @param isVpn vpn availability in message
*/
public BGPPrefixIPv4LSNlriVer4(long identifier, byte protocolId, BGPPrefixLSIdentifier bgpPrefixLSIdentifier,
RouteDistinguisher routeDistinguisher, boolean isVpn) {
this.identifier = identifier;
this.protocolId = protocolId;
this.bgpPrefixLSIdentifier = bgpPrefixLSIdentifier;
this.routeDistinguisher = routeDistinguisher;
this.isVpn = isVpn;
}
/**
* Reads from channelBuffer and parses Prefix LS Nlri.
*
* @param cb ChannelBuffer
* @param afi Address family identifier
* @param safi Subsequent address family identifier
* @return object of BGPPrefixIPv4LSNlriVer4
* @throws BGPParseException while parsing Prefix LS Nlri
*/
public static BGPPrefixIPv4LSNlriVer4 read(ChannelBuffer cb, short afi, byte safi) throws BGPParseException {
boolean isVpn = false;
RouteDistinguisher routeDistinguisher = null;
if ((afi == Constants.AFI_VALUE) && (safi == Constants.VPN_SAFI_VALUE)) {
routeDistinguisher = new RouteDistinguisher();
routeDistinguisher = RouteDistinguisher.read(cb);
isVpn = true;
} else {
isVpn = false;
}
byte protocolId = cb.readByte();
long identifier = cb.readLong();
BGPPrefixLSIdentifier bgpPrefixLSIdentifier = new BGPPrefixLSIdentifier();
bgpPrefixLSIdentifier = BGPPrefixLSIdentifier.parsePrefixIdendifier(cb, protocolId);
return new BGPPrefixIPv4LSNlriVer4(identifier, protocolId, bgpPrefixLSIdentifier, routeDistinguisher, isVpn);
}
@Override
public NlriType getNlriType() {
return NlriType.PREFIX_IPV4;
}
@Override
public NodeDescriptors getLocalNodeDescriptors() {
return this.bgpPrefixLSIdentifier.getLocalNodeDescriptors();
}
@Override
public long getIdentifier() {
return this.identifier;
}
/**
* Set the prefix LS identifier.
*
* @param bgpPrefixLSIdentifier prefix identifier to set
*/
public void setPrefixLSIdentifier(BGPPrefixLSIdentifier bgpPrefixLSIdentifier) {
this.bgpPrefixLSIdentifier = bgpPrefixLSIdentifier;
}
@Override
public PROTOCOLTYPE getProtocolId() throws BGPParseException {
switch (protocolId) {
case Constants.ISIS_LEVELONE:
return PROTOCOLTYPE.ISIS_LevelOne;
case Constants.ISIS_LEVELTWO:
return PROTOCOLTYPE.ISIS_LevelTwo;
case Constants.OSPFV2:
return PROTOCOLTYPE.OSPFv2;
case Constants.DIRECT:
return PROTOCOLTYPE.Direct;
case Constants.STATIC_CONFIGURATION:
return PROTOCOLTYPE.Static_Configuration;
case Constants.OSPFV3:
return PROTOCOLTYPE.OSPFv3;
default:
throw new BGPParseException("protocol id not valid");
}
}
/**
* Returns whether VPN is present or not.
*
* @return whether VPN is present or not
*/
public boolean isVpnPresent() {
return this.isVpn;
}
/**
* Returns Prefix Identifier.
*
* @return Prefix Identifier
*/
public BGPPrefixLSIdentifier getPrefixIdentifier() {
return this.bgpPrefixLSIdentifier;
}
@Override
public RouteDistinguisher getRouteDistinguisher() {
return this.routeDistinguisher;
}
@Override
public LinkedList<BGPValueType> getPrefixdescriptor() {
return this.bgpPrefixLSIdentifier.getPrefixdescriptor();
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.omitNullValues()
.add("protocolId", protocolId)
.add("identifier", identifier)
.add("RouteDistinguisher ", routeDistinguisher)
.add("bgpPrefixLSIdentifier", bgpPrefixLSIdentifier)
.toString();
}
}
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