org.ambud.marauder.source.ids.pcap.layer3.IPv6.java Source code

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/*
 * Copyright 2013 Ambud Sharma
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.2
 */
package org.ambud.marauder.source.ids.pcap.layer3;

import java.io.DataInput;
import java.io.IOException;

import org.ambud.marauder.source.ids.pcap.layer2.EtherFrame;
import org.apache.commons.codec.binary.Hex;

public class IPv6 extends NetworkLayer {

    public static int IP6_HDR_LENGTH = 40;
    public static int IP6_ADDR_LENGTH = 16;

    private byte version; /* 4 bits */
    private byte trafficClass; /* 8 bits */
    private int flowLbl; /* 20 bits */
    private short payloadLength; /* 16 bits */
    private byte nextHdr, hopLimit; /* 8 & 8 bits */

    private EtherFrame parent;

    private byte[] srcIP = new byte[IP6_ADDR_LENGTH], dstIP = new byte[IP6_ADDR_LENGTH]; /* 128 bit IPv6 IP addr */

    public IPv6() {
    }

    @Override
    public void decode(DataInput di, EtherFrame parent) throws IOException {
        this.parent = parent;
        byte[] tempBytes = new byte[4];
        di.readFully(tempBytes);
        this.version = (byte) ((tempBytes[0] >> 4) & 0xff);
        this.trafficClass = (byte) ((tempBytes[0] << 4) | ((tempBytes[1] >> 4) & 0xff));
        this.flowLbl = (byte) ((((int) (tempBytes[1] << 4) & 0xffff) << 16) | (((short) tempBytes[2] << 8) & 0xff)
                | (tempBytes[3] & 0xff));
        this.payloadLength = EtherFrame.readShort(di);
        this.nextHdr = di.readByte();
        this.hopLimit = di.readByte();
        di.readFully(this.srcIP);
        di.readFully(this.dstIP);
        decodeNextLayer(di);
    }

    /**
     * @return the version
     */
    public byte getVersion() {
        return version;
    }

    /**
     * @return the trafficClass
     */
    public byte getTrafficClass() {
        return trafficClass;
    }

    /**
     * @return the flowLbl
     */
    public int getFlowLbl() {
        return flowLbl;
    }

    /**
     * @return the payloadLength
     */
    public short getPayloadLength() {
        return payloadLength;
    }

    /**
     * @return the hopLimit
     */
    public byte getHopLimit() {
        return hopLimit;
    }

    /**
     * @return the srcIP
     */
    public byte[] getSrcIP() {
        return srcIP;
    }

    /**
     * @return the dstIP
     */
    public byte[] getDstIP() {
        return dstIP;
    }

    /**
     * @return the nextHdr
     */
    public byte getNextHdr() {
        return nextHdr;
    }

    @Override
    public String toString() {
        return "Version:" + version + " Traffic Class:" + trafficClass + " FlowLbl:" + flowLbl + " Src:"
                + Hex.encodeHexString(srcIP) + " Dst:" + Hex.encodeHexString(dstIP) + " Payload:" + payloadLength
                + " NxtHDR:" + nextHdr;
    }

    @Override
    public NETWORK_LAYER_TYPE getType() {
        return NETWORK_LAYER_TYPE.IPv6;
    }

    @Override
    public byte[] getSourceAddr() {
        return srcIP;
    }

    @Override
    public byte[] getDestinationAddr() {
        return dstIP;
    }

    @Override
    public byte getNextProto() {
        return nextHdr;
    }

    @Override
    public EtherFrame getParent() {
        return parent;
    }

}