| /* |
| * Copyright 2017-present 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.onlab.packet; |
| |
| import com.google.common.collect.ImmutableSet; |
| import com.google.common.collect.Lists; |
| import org.onlab.packet.dhcp.Dhcp6Option; |
| |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| import java.util.Set; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| /** |
| * Representation of an DHCPv6 Packet. |
| * Base on RFC-3315. |
| */ |
| public class DHCP6 extends BasePacket { |
| // size of different field of option |
| private static final int OPT_CODE_SIZE = 2; |
| private static final int OPT_LEN_SIZE = 2; |
| |
| // default size of DHCPv6 payload (without options) |
| private static final int DHCP6_DEFAULT_SIZE = 4; |
| |
| // default size of DHCPv6 relay message payload (without options) |
| private static final int DHCP6_RELAY_MSG_SIZE = 34; |
| private static final int IPV6_ADDR_LEN = 16; |
| |
| // masks & offsets for default DHCPv6 header |
| private static final int MSG_TYPE_OFFSET = 24; |
| private static final int TRANSACTION_ID_MASK = 0x00ffffff; |
| |
| // Relay message types |
| private static final Set<Byte> RELAY_MSG_TYPES = |
| ImmutableSet.of(MsgType.RELAY_FORW.value, |
| MsgType.RELAY_REPL.value); |
| |
| /** |
| * DHCPv6 message type. |
| */ |
| public enum MsgType { |
| SOLICIT((byte) 1), ADVERTISE((byte) 2), REQUEST((byte) 3), |
| CONFIRM((byte) 4), RENEW((byte) 5), REBIND((byte) 6), |
| REPLY((byte) 7), RELEASE((byte) 8), DECLINE((byte) 9), |
| RECONFIGURE((byte) 10), INFORMATION_REQUEST((byte) 11), |
| RELAY_FORW((byte) 12), RELAY_REPL((byte) 13); |
| |
| protected byte value; |
| MsgType(final byte value) { |
| this.value = value; |
| } |
| public byte value() { |
| return this.value; |
| } |
| } |
| |
| /** |
| * DHCPv6 option code. |
| */ |
| public enum OptionCode { |
| CLIENTID((short) 1), SERVERID((short) 2), IA_NA((short) 3), IA_TA((short) 4), |
| IAADDR((short) 5), ORO((short) 6), PREFERENCE((short) 7), ELAPSED_TIME((short) 8), |
| RELAY_MSG((short) 9), AUTH((short) 11), UNICAST((short) 12), |
| STATUS_CODE((short) 13), RAPID_COMMIT((short) 14), USER_CLASS((short) 15), |
| VENDOR_CLASS((short) 16), VENDOR_OPTS((short) 17), INTERFACE_ID((short) 18), |
| RECONF_MSG((short) 19), RECONF_ACCEPT((short) 20); |
| |
| protected short value; |
| OptionCode(final short value) { |
| this.value = value; |
| } |
| public short value() { |
| return this.value; |
| } |
| } |
| |
| // general field |
| private byte msgType; // 1 byte |
| private List<Dhcp6Option> options; |
| |
| // non-relay field |
| private int transactionId; // 3 bytes |
| |
| // relay field |
| private byte hopCount; // 1 byte |
| private byte[] linkAddress; // 16 bytes |
| private byte[] peerAddress; // 16 bytes |
| |
| /** |
| * Creates new DHCPv6 object. |
| */ |
| public DHCP6() { |
| options = Lists.newArrayList(); |
| } |
| |
| @Override |
| public byte[] serialize() { |
| int payloadLength = options.stream() |
| .mapToInt(Dhcp6Option::getLength) |
| .sum(); |
| |
| // 2 bytes code and 2 bytes length |
| payloadLength += options.size() * (OPT_CODE_SIZE + OPT_LEN_SIZE); |
| |
| if (RELAY_MSG_TYPES.contains(msgType)) { |
| payloadLength += DHCP6_RELAY_MSG_SIZE; |
| } else { |
| payloadLength += DHCP6_DEFAULT_SIZE; |
| } |
| |
| ByteBuffer bb = ByteBuffer.allocate(payloadLength); |
| |
| if (RELAY_MSG_TYPES.contains(msgType)) { |
| bb.put(msgType); |
| bb.put(hopCount); |
| bb.put(linkAddress); |
| bb.put(peerAddress); |
| } else { |
| int defaultHeader = ((int) msgType) << MSG_TYPE_OFFSET | (transactionId & TRANSACTION_ID_MASK); |
| bb.putInt(defaultHeader); |
| } |
| |
| // serialize options |
| options.forEach(option -> { |
| bb.putShort(option.getCode()); |
| bb.putShort(option.getLength()); |
| bb.put(option.getData()); |
| }); |
| |
| return bb.array(); |
| } |
| |
| /** |
| * Returns a deserializer for DHCPv6. |
| * |
| * @return the deserializer for DHCPv6 |
| */ |
| public static Deserializer<DHCP6> deserializer() { |
| return (data, offset, length) -> { |
| DHCP6 dhcp6 = new DHCP6(); |
| |
| checkNotNull(data); |
| |
| if (offset < 0 || length < 0 || |
| length > data.length || offset >= data.length || |
| offset + length > data.length) { |
| throw new DeserializationException("Illegal offset or length"); |
| } |
| |
| final ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| if (bb.remaining() < DHCP6.DHCP6_DEFAULT_SIZE) { |
| throw new DeserializationException( |
| "Buffer underflow while reading DHCPv6 option"); |
| } |
| |
| // peek message type |
| dhcp6.msgType = bb.array()[0]; |
| if (RELAY_MSG_TYPES.contains(dhcp6.msgType)) { |
| bb.get(); // drop message type |
| dhcp6.hopCount = bb.get(); |
| dhcp6.linkAddress = new byte[IPV6_ADDR_LEN]; |
| dhcp6.peerAddress = new byte[IPV6_ADDR_LEN]; |
| |
| bb.get(dhcp6.linkAddress); |
| bb.get(dhcp6.peerAddress); |
| } else { |
| // get msg type + transaction id (1 + 3 bytes) |
| int defaultHeader = bb.getInt(); |
| dhcp6.transactionId = defaultHeader & TRANSACTION_ID_MASK; |
| } |
| |
| dhcp6.options = Lists.newArrayList(); |
| while (bb.remaining() >= OPT_CODE_SIZE) { |
| Dhcp6Option option = new Dhcp6Option(); |
| short code = bb.getShort(); |
| if (bb.remaining() < OPT_LEN_SIZE) { |
| throw new DeserializationException( |
| "Buffer underflow while reading DHCPv6 option"); |
| } |
| |
| short optionLen = bb.getShort(); |
| if (bb.remaining() < optionLen) { |
| throw new DeserializationException( |
| "Buffer underflow while reading DHCPv6 option"); |
| } |
| |
| byte[] optionData = new byte[optionLen]; |
| bb.get(optionData); |
| |
| option.setCode(code); |
| option.setLength(optionLen); |
| option.setData(optionData); |
| dhcp6.options.add(option); |
| } |
| |
| return dhcp6; |
| }; |
| } |
| |
| @Override |
| public IPacket deserialize(byte[] data, int offset, int length) { |
| try { |
| return deserializer().deserialize(data, offset, length); |
| } catch (DeserializationException e) { |
| return null; |
| } |
| } |
| |
| /** |
| * Gets the message type of this DHCPv6 packet. |
| * |
| * @return the message type |
| */ |
| public byte getMsgType() { |
| return msgType; |
| } |
| |
| /** |
| * Gets options from this DHCPv6 packet. |
| * |
| * @return DHCPv6 options |
| */ |
| public List<Dhcp6Option> getOptions() { |
| return options; |
| } |
| |
| /** |
| * Gets the transaction ID of this DHCPv6 packet. |
| * |
| * @return the transaction ID |
| */ |
| public int getTransactionId() { |
| return transactionId; |
| } |
| |
| /** |
| * Gets the hop count of this DHCPv6 relay message. |
| * |
| * @return the hop count |
| */ |
| public byte getHopCount() { |
| return hopCount; |
| } |
| |
| /** |
| * Gets the link address of this DHCPv6 relay message. |
| * |
| * @return the link address |
| */ |
| public byte[] getLinkAddress() { |
| return linkAddress; |
| } |
| |
| /** |
| * Gets the peer address of this DHCPv6 relay message. |
| * |
| * @return the link address |
| */ |
| public byte[] getPeerAddress() { |
| return peerAddress; |
| } |
| |
| /** |
| * Sets message type. |
| * |
| * @param msgType the message type |
| */ |
| public void setMsgType(byte msgType) { |
| this.msgType = msgType; |
| } |
| |
| /** |
| * Sets options. |
| * |
| * @param options the options |
| */ |
| public void setOptions(List<Dhcp6Option> options) { |
| this.options = options; |
| } |
| |
| /** |
| * Sets transaction id. |
| * |
| * @param transactionId the transaction id |
| */ |
| public void setTransactionId(int transactionId) { |
| this.transactionId = transactionId; |
| } |
| |
| /** |
| * Sets hop count. |
| * |
| * @param hopCount the hop count |
| */ |
| public void setHopCount(byte hopCount) { |
| this.hopCount = hopCount; |
| } |
| |
| /** |
| * Sets link address. |
| * |
| * @param linkAddress the link address |
| */ |
| public void setLinkAddress(byte[] linkAddress) { |
| this.linkAddress = linkAddress; |
| } |
| |
| /** |
| * Sets peer address. |
| * |
| * @param peerAddress the peer address |
| */ |
| public void setPeerAddress(byte[] peerAddress) { |
| this.peerAddress = peerAddress; |
| } |
| } |