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/*
* Copyright 2014-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.onlab.packet;
import org.onlab.packet.ipv6.Authentication;
import org.onlab.packet.ipv6.DestinationOptions;
import org.onlab.packet.ipv6.EncapSecurityPayload;
import org.onlab.packet.ipv6.Fragment;
import org.onlab.packet.ipv6.HopByHopOptions;
import org.onlab.packet.ipv6.IExtensionHeader;
import org.onlab.packet.ipv6.Routing;
import com.google.common.collect.ImmutableMap;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Map;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkArgument;
import static org.onlab.packet.PacketUtils.checkInput;
/**
* Implements IPv6 packet format. (RFC 2460)
*/
public class IPv6 extends IP implements IExtensionHeader {
public static final byte FIXED_HEADER_LENGTH = 40; // bytes
public static final byte PROTOCOL_TCP = 0x6;
public static final byte PROTOCOL_UDP = 0x11;
public static final byte PROTOCOL_ICMP6 = 0x3A;
public static final byte PROTOCOL_HOPOPT = 0x00;
public static final byte PROTOCOL_ROUTING = 0x2B;
public static final byte PROTOCOL_FRAG = 0x2C;
public static final byte PROTOCOL_ESP = 0x32;
public static final byte PROTOCOL_AH = 0x33;
public static final byte PROTOCOL_DSTOPT = 0x3C;
public static final byte LINK_LOCAL_0 = (byte) 0xfe;
public static final byte LINK_LOCAL_1 = (byte) 0x80;
public static final Map> PROTOCOL_DESERIALIZER_MAP =
ImmutableMap.>builder()
.put(IPv6.PROTOCOL_ICMP6, ICMP6.deserializer())
.put(IPv6.PROTOCOL_TCP, TCP.deserializer())
.put(IPv6.PROTOCOL_UDP, UDP.deserializer())
.put(IPv6.PROTOCOL_HOPOPT, HopByHopOptions.deserializer())
.put(IPv6.PROTOCOL_ROUTING, Routing.deserializer())
.put(IPv6.PROTOCOL_FRAG, Fragment.deserializer())
.put(IPv6.PROTOCOL_ESP, EncapSecurityPayload.deserializer())
.put(IPv6.PROTOCOL_AH, Authentication.deserializer())
.put(IPv6.PROTOCOL_DSTOPT, DestinationOptions.deserializer())
.build();
protected byte version;
protected byte trafficClass;
protected int flowLabel;
protected short payloadLength;
protected byte nextHeader;
protected byte hopLimit;
protected byte[] sourceAddress = new byte[Ip6Address.BYTE_LENGTH];
protected byte[] destinationAddress = new byte[Ip6Address.BYTE_LENGTH];
/**
* Default constructor that sets the version to 6.
*/
public IPv6() {
super();
this.version = 6;
}
@Override
public byte getVersion() {
return this.version;
}
@Override
public IPv6 setVersion(final byte version) {
this.version = version;
return this;
}
/**
* Gets traffic class.
*
* @return the traffic class
*/
public byte getTrafficClass() {
return this.trafficClass;
}
/**
* Sets traffic class.
*
* @param trafficClass the traffic class to set
* @return this
*/
public IPv6 setTrafficClass(final byte trafficClass) {
this.trafficClass = trafficClass;
return this;
}
/**
* Gets flow label.
*
* @return the flow label
*/
public int getFlowLabel() {
return this.flowLabel;
}
/**
* Sets flow label.
*
* @param flowLabel the flow label to set
* @return this
*/
public IPv6 setFlowLabel(final int flowLabel) {
this.flowLabel = flowLabel;
return this;
}
@Override
public byte getNextHeader() {
return this.nextHeader;
}
@Override
public IPv6 setNextHeader(final byte nextHeader) {
this.nextHeader = nextHeader;
return this;
}
/**
* Gets hop limit.
*
* @return the hop limit
*/
public byte getHopLimit() {
return this.hopLimit;
}
/**
* Sets hop limit.
*
* @param hopLimit the hop limit to set
* @return this
*/
public IPv6 setHopLimit(final byte hopLimit) {
this.hopLimit = hopLimit;
return this;
}
/**
* Gets source address.
*
* @return the IPv6 source address
*/
public byte[] getSourceAddress() {
return this.sourceAddress;
}
/**
* Sets source address.
*
* @param sourceAddress the IPv6 source address to set
* @return this
*/
public IPv6 setSourceAddress(final byte[] sourceAddress) {
this.sourceAddress = Arrays.copyOfRange(sourceAddress, 0, Ip6Address.BYTE_LENGTH);
return this;
}
/**
* Gets destination address.
*
* @return the IPv6 destination address
*/
public byte[] getDestinationAddress() {
return this.destinationAddress;
}
/**
* Sets destination address.
*
* @param destinationAddress the IPv6 destination address to set
* @return this
*/
public IPv6 setDestinationAddress(final byte[] destinationAddress) {
this.destinationAddress = Arrays.copyOfRange(destinationAddress, 0, Ip6Address.BYTE_LENGTH);
return this;
}
@Override
public byte[] serialize() {
byte[] payloadData = null;
if (this.payload != null) {
this.payload.setParent(this);
payloadData = this.payload.serialize();
}
this.payloadLength = 0;
if (payloadData != null) {
this.payloadLength = (short) payloadData.length;
}
final byte[] data = new byte[FIXED_HEADER_LENGTH + payloadLength];
final ByteBuffer bb = ByteBuffer.wrap(data);
bb.putInt((this.version & 0xf) << 28 | (this.trafficClass & 0xff) << 20 | this.flowLabel & 0xfffff);
bb.putShort(this.payloadLength);
bb.put(this.nextHeader);
bb.put(this.hopLimit);
bb.put(this.sourceAddress, 0, Ip6Address.BYTE_LENGTH);
bb.put(this.destinationAddress, 0, Ip6Address.BYTE_LENGTH);
if (payloadData != null) {
bb.put(payloadData);
}
return data;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
final int prime = 2521;
int result = super.hashCode();
ByteBuffer bb;
bb = ByteBuffer.wrap(this.destinationAddress);
for (int i = 0; i < 4; i++) {
result = prime * result + bb.getInt();
}
result = prime * result + this.trafficClass;
result = prime * result + this.flowLabel;
result = prime * result + this.hopLimit;
result = prime * result + this.nextHeader;
result = prime * result + this.payloadLength;
bb = ByteBuffer.wrap(this.sourceAddress);
for (int i = 0; i < 4; i++) {
result = prime * result + bb.getInt();
}
result = prime * result + this.version;
return result;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (!super.equals(obj)) {
return false;
}
if (!(obj instanceof IPv6)) {
return false;
}
final IPv6 other = (IPv6) obj;
if (!Arrays.equals(this.destinationAddress, other.destinationAddress)) {
return false;
}
if (this.trafficClass != other.trafficClass) {
return false;
}
if (this.flowLabel != other.flowLabel) {
return false;
}
if (this.hopLimit != other.hopLimit) {
return false;
}
if (this.nextHeader != other.nextHeader) {
return false;
}
if (this.payloadLength != other.payloadLength) {
return false;
}
if (!Arrays.equals(this.sourceAddress, other.sourceAddress)) {
return false;
}
return true;
}
/**
* Deserializer function for IPv6 packets.
*
* @return deserializer function
*/
public static Deserializer deserializer() {
return (data, offset, length) -> {
checkInput(data, offset, length, FIXED_HEADER_LENGTH);
IPv6 ipv6 = new IPv6();
ByteBuffer bb = ByteBuffer.wrap(data, offset, length);
int iscratch = bb.getInt();
ipv6.version = (byte) (iscratch >> 28 & 0xf);
ipv6.trafficClass = (byte) (iscratch >> 20 & 0xff);
ipv6.flowLabel = iscratch & 0xfffff;
ipv6.payloadLength = bb.getShort();
ipv6.nextHeader = bb.get();
ipv6.hopLimit = bb.get();
bb.get(ipv6.sourceAddress, 0, Ip6Address.BYTE_LENGTH);
bb.get(ipv6.destinationAddress, 0, Ip6Address.BYTE_LENGTH);
Deserializer deserializer;
if (IPv6.PROTOCOL_DESERIALIZER_MAP.containsKey(ipv6.nextHeader)) {
deserializer = IPv6.PROTOCOL_DESERIALIZER_MAP.get(ipv6.nextHeader);
} else {
deserializer = Data.deserializer();
}
int remainingLength = bb.limit() - bb.position();
int payloadLength = ipv6.payloadLength;
int bytesToRead = (payloadLength <= remainingLength) ?
payloadLength : remainingLength;
ipv6.payload = deserializer.deserialize(data, bb.position(), bytesToRead);
ipv6.payload.setParent(ipv6);
return ipv6;
};
}
@Override
public String toString() {
return toStringHelper(getClass())
.add("version", Byte.toString(version))
.add("trafficClass", Byte.toString(trafficClass))
.add("flowLabel", Integer.toString(flowLabel))
.add("payloadLength", Short.toString(payloadLength))
.add("nextHeader", Byte.toString(nextHeader))
.add("hopLimit", Byte.toString(hopLimit))
.add("sourceAddress", Arrays.toString(sourceAddress))
.add("destinationAddress", Arrays.toString(destinationAddress))
.toString();
}
/**
* According to the RFC 4291, the solicitation node addresses are
* formed by taking the low-order 24 bits of an address (unicast or anycast)
* and appending those bits to the prefix FF02:0:0:0:0:1:FF00::/104.
*
* Solicited-Node Address: FF02:0:0:0:0:1:FFXX:XXXX
*
* @param targetIp the unicast or anycast address
* @return the computed solicitation node address
*/
public static byte[] getSolicitNodeAddress(byte[] targetIp) {
checkArgument(targetIp.length == Ip6Address.BYTE_LENGTH);
return new byte[] {
(byte) 0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01, (byte) 0xff,
targetIp[targetIp.length - 3],
targetIp[targetIp.length - 2],
targetIp[targetIp.length - 1]
};
}
/**
* According to the RFC 2464, an IPv6 packet with a multicast
* destination address DST, consisting of the sixteen octets DST[1]
* through DST[16], is transmitted to the Ethernet multicast address
* whose first two octets are the value 3333 hexadecimal and whose last
* four octets are the last four octets of DST.
*
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |0 0 1 1 0 0 1 1|0 0 1 1 0 0 1 1|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | DST[13] | DST[14] |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | DST[15] | DST[16] |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* @param targetIp the multicast address.
* @return the multicast mac address
*/
public static byte[] getMCastMacAddress(byte[] targetIp) {
checkArgument(targetIp.length == Ip6Address.BYTE_LENGTH);
return new byte[] {
0x33, 0x33,
targetIp[targetIp.length - 4],
targetIp[targetIp.length - 3],
targetIp[targetIp.length - 2],
targetIp[targetIp.length - 1],
};
}
/**
* According to the RFC 4291, an IPv6 link local address is an IPv6
* unicast address that can be automatically configured on any interface
* using the link-local prefix FE80::/10 (1111 1110 10) and the interface
* identifier in the modified EUI-64 format.
*
* +----------------------------------------------------------------+
* | 10 bits | 54 bits | 64 bits |
* +----------- +-------------------------+-------------------------+
* | 1111111010 | 0 | interface ID |
* +----------- +-------------------------+-------------------------+
*
* @param targetIp the ip address to verify
* @return true if the ipv6 address is link local,
* false otherwise
*/
public static boolean isLinkLocalAddress(byte[] targetIp) {
checkArgument(targetIp.length == Ip6Address.BYTE_LENGTH);
return (targetIp[0] & 0xff) == 0xfe && (targetIp[1] & 0xc0) == 0x80;
}
/**
* Returns the auto-generated link local address using the
* mac address as parameter.
*
* @param macAddress the mac address to use
* @return the ipv6 link local address
*/
public static byte[] getLinkLocalAddress(byte[] macAddress) {
checkArgument(macAddress.length == MacAddress.MAC_ADDRESS_LENGTH);
return new byte[] {
LINK_LOCAL_0,
LINK_LOCAL_1,
0, 0, 0, 0, 0, 0,
(byte) (macAddress[0] ^ (1 << 1)),
macAddress[1],
macAddress[2],
(byte) 0xff,
(byte) 0xfe,
macAddress[3],
macAddress[4],
macAddress[5],
};
}
/**
* Returns the mac address from the auto-generated
* link local address.
*
* @param linkLocalAddress the ipv6 to use
* @return the mac address
*/
public static byte[] getMacAddress(byte[] linkLocalAddress) {
return !isLinkLocalAddress(linkLocalAddress) ? null : new byte[] {
(byte) (linkLocalAddress[8] ^ (1 << 1)),
linkLocalAddress[9],
linkLocalAddress[10],
linkLocalAddress[13],
linkLocalAddress[14],
linkLocalAddress[15],
};
}
}
