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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.types;
import java.net.InetAddress;
import java.util.LinkedList;
import java.util.List;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onlab.packet.Ip4Address;
import org.onosproject.bgpio.exceptions.BGPParseException;
import org.onosproject.bgpio.protocol.BGPLSNlri;
import org.onosproject.bgpio.protocol.linkstate.BGPPrefixIPv4LSNlriVer4;
import org.onosproject.bgpio.protocol.linkstate.BGPNodeLSNlriVer4;
import org.onosproject.bgpio.protocol.linkstate.BgpLinkLsNlriVer4;
import org.onosproject.bgpio.util.Constants;
import org.onosproject.bgpio.util.Validation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
/*
* Provides Implementation of MpReach Nlri BGP Path Attribute.
*/
public class MpReachNlri implements BGPValueType {
private static final Logger log = LoggerFactory.getLogger(MpReachNlri.class);
public static final byte MPREACHNLRI_TYPE = 14;
public static final byte LINK_NLRITYPE = 2;
private boolean isMpReachNlri = false;
private final List<BGPLSNlri> mpReachNlri;
private final int length;
private final short afi;
private final byte safi;
private final Ip4Address ipNextHop;
/**
* Constructor to initialize parameters.
*
* @param mpReachNlri MpReach Nlri attribute
* @param afi address family identifier
* @param safi subsequent address family identifier
* @param ipNextHop nexthop IpAddress
* @param length of MpReachNlri
*/
public MpReachNlri(List<BGPLSNlri> mpReachNlri, short afi, byte safi, Ip4Address ipNextHop, int length) {
this.mpReachNlri = mpReachNlri;
this.isMpReachNlri = true;
this.ipNextHop = ipNextHop;
this.afi = afi;
this.safi = safi;
this.length = length;
}
/**
* Returns whether MpReachNlri is present.
*
* @return whether MpReachNlri is present
*/
public boolean isMpReachNlriSet() {
return this.isMpReachNlri;
}
/**
* Returns list of MpReach Nlri.
*
* @return list of MpReach Nlri
*/
public List<BGPLSNlri> mpReachNlri() {
return this.mpReachNlri;
}
/**
* Returns length of MpReachNlri.
*
* @return length of MpReachNlri
*/
public int mpReachNlriLen() {
return this.length;
}
/**
* Reads from ChannelBuffer and parses MpReachNlri.
*
* @param cb channelBuffer
* @return object of MpReachNlri
* @throws BGPParseException while parsing MpReachNlri
*/
public static MpReachNlri read(ChannelBuffer cb) throws BGPParseException {
ChannelBuffer tempBuf = cb.copy();
Validation parseFlags = Validation.parseAttributeHeader(cb);
int len = parseFlags.isShort() ? parseFlags.getLength() + Constants.TYPE_AND_LEN_AS_SHORT :
parseFlags.getLength() + Constants.TYPE_AND_LEN_AS_BYTE;
ChannelBuffer data = tempBuf.readBytes(len);
if (cb.readableBytes() < parseFlags.getLength()) {
Validation.validateLen(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.ATTRIBUTE_LENGTH_ERROR,
parseFlags.getLength());
}
if (!parseFlags.getFirstBit() && parseFlags.getSecondBit() && parseFlags.getThirdBit()) {
throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.ATTRIBUTE_FLAGS_ERROR, data);
}
BGPLSNlri bgpLSNlri = null;
List<BGPLSNlri> mpReachNlri = new LinkedList<>();
ChannelBuffer tempCb = cb.readBytes(parseFlags.getLength());
short afi = 0;
byte safi = 0;
Ip4Address ipNextHop = null;
while (tempCb.readableBytes() > 0) {
afi = tempCb.readShort();
safi = tempCb.readByte();
//Supporting for AFI 16388 / SAFI 71 and VPN AFI 16388 / SAFI 128
if ((afi == Constants.AFI_VALUE) && (safi == Constants.SAFI_VALUE) || (afi == Constants.AFI_VALUE)
&& (safi == Constants.VPN_SAFI_VALUE)) {
byte nextHopLen = tempCb.readByte();
InetAddress ipAddress = Validation.toInetAddress(nextHopLen, cb);
if (ipAddress.isMulticastAddress()) {
throw new BGPParseException("Multicast not supported");
}
ipNextHop = Ip4Address.valueOf(ipAddress);
byte reserved = tempCb.readByte();
while (tempCb.readableBytes() > 0) {
short nlriType = tempCb.readShort();
short totNlriLen = tempCb.readShort();
if (tempCb.readableBytes() < totNlriLen) {
Validation.validateLen(BGPErrorType.UPDATE_MESSAGE_ERROR,
BGPErrorType.ATTRIBUTE_LENGTH_ERROR, totNlriLen);
}
tempBuf = tempCb.readBytes(totNlriLen);
switch (nlriType) {
case BGPNodeLSNlriVer4.NODE_NLRITYPE:
bgpLSNlri = BGPNodeLSNlriVer4.read(tempBuf, afi, safi);
break;
case BgpLinkLsNlriVer4.LINK_NLRITYPE:
bgpLSNlri = BgpLinkLsNlriVer4.read(tempBuf, afi, safi);
break;
case BGPPrefixIPv4LSNlriVer4.PREFIX_IPV4_NLRITYPE:
bgpLSNlri = BGPPrefixIPv4LSNlriVer4.read(tempBuf, afi, safi);
break;
default:
log.debug("nlriType not supported" + nlriType);
}
mpReachNlri.add(bgpLSNlri);
}
} else {
throw new BGPParseException("Not Supporting afi " + afi + "safi " + safi);
}
}
return new MpReachNlri(mpReachNlri, afi, safi, ipNextHop, parseFlags.getLength());
}
@Override
public short getType() {
return MPREACHNLRI_TYPE;
}
/**
* Returns AFI.
*
* @return AFI
*/
public short afi() {
return this.afi;
}
/**
* Returns Nexthop IpAddress.
*
* @return Nexthop IpAddress
*/
public Ip4Address nexthop4() {
return this.ipNextHop;
}
/**
* Returns SAFI.
*
* @return SAFI
*/
public byte safi() {
return this.safi;
}
@Override
public int write(ChannelBuffer cb) {
//Not to be Implemented as of now
return 0;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("mpReachNlri", mpReachNlri)
.add("afi", afi)
.add("safi", safi)
.add("ipNextHop", ipNextHop)
.add("length", length)
.toString();
}
}
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