| /* |
| * Copyright 2014 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 org.onlab.packet.ndp.NeighborAdvertisement; |
| import org.onlab.packet.ndp.NeighborSolicitation; |
| import org.onlab.packet.ndp.Redirect; |
| import org.onlab.packet.ndp.RouterAdvertisement; |
| import org.onlab.packet.ndp.RouterSolicitation; |
| import java.nio.ByteBuffer; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Implements ICMPv6 packet format. (RFC 4443) |
| */ |
| public class ICMP6 extends BasePacket { |
| public static final byte HEADER_LENGTH = 4; // bytes |
| |
| public static final byte ROUTER_SOLICITATION = (byte) 0x85; |
| public static final byte ROUTER_ADVERTISEMENT = (byte) 0x86; |
| public static final byte NEIGHBOR_SOLICITATION = (byte) 0x87; |
| public static final byte NEIGHBOR_ADVERTISEMENT = (byte) 0x88; |
| public static final byte REDIRECT = (byte) 0x89; |
| public static final Map<Byte, Class<? extends IPacket>> PROTOCOL_CLASS_MAP = |
| new HashMap<>(); |
| |
| static { |
| ICMP6.PROTOCOL_CLASS_MAP.put(ICMP6.ROUTER_SOLICITATION, RouterSolicitation.class); |
| ICMP6.PROTOCOL_CLASS_MAP.put(ICMP6.ROUTER_ADVERTISEMENT, RouterAdvertisement.class); |
| ICMP6.PROTOCOL_CLASS_MAP.put(ICMP6.NEIGHBOR_SOLICITATION, NeighborSolicitation.class); |
| ICMP6.PROTOCOL_CLASS_MAP.put(ICMP6.NEIGHBOR_ADVERTISEMENT, NeighborAdvertisement.class); |
| ICMP6.PROTOCOL_CLASS_MAP.put(ICMP6.REDIRECT, Redirect.class); |
| } |
| |
| protected byte icmpType; |
| protected byte icmpCode; |
| protected short checksum; |
| |
| /** |
| * Gets ICMP6 type. |
| * |
| * @return the ICMP6 type |
| */ |
| public byte getIcmpType() { |
| return this.icmpType; |
| } |
| |
| /** |
| * Sets ICMP6 type. |
| * |
| * @param icmpType the ICMP type to set |
| * @return this |
| */ |
| public ICMP6 setIcmpType(final byte icmpType) { |
| this.icmpType = icmpType; |
| return this; |
| } |
| |
| /** |
| * Gets ICMP6 code. |
| * |
| * @return the ICMP6 code |
| */ |
| public byte getIcmpCode() { |
| return this.icmpCode; |
| } |
| |
| /** |
| * Sets ICMP6 code. |
| * |
| * @param icmpCode the ICMP6 code to set |
| * @return this |
| */ |
| public ICMP6 setIcmpCode(final byte icmpCode) { |
| this.icmpCode = icmpCode; |
| return this; |
| } |
| |
| /** |
| * Gets checksum. |
| * |
| * @return the checksum |
| */ |
| public short getChecksum() { |
| return this.checksum; |
| } |
| |
| /** |
| * Sets checksum. |
| * |
| * @param checksum the checksum to set |
| * @return this |
| */ |
| public ICMP6 setChecksum(final short checksum) { |
| this.checksum = checksum; |
| return this; |
| } |
| |
| @Override |
| public byte[] serialize() { |
| byte[] payloadData = null; |
| if (this.payload != null) { |
| this.payload.setParent(this); |
| payloadData = this.payload.serialize(); |
| } |
| |
| int payloadLength = 0; |
| if (payloadData != null) { |
| payloadLength = payloadData.length; |
| } |
| |
| final byte[] data = new byte[HEADER_LENGTH + payloadLength]; |
| final ByteBuffer bbData = ByteBuffer.wrap(data); |
| |
| // Creating ByteBuffer for checksum calculation |
| final byte[] checksumData = |
| new byte[IPv6.FIXED_HEADER_LENGTH + HEADER_LENGTH + payloadLength]; |
| final ByteBuffer bbChecksum = ByteBuffer.wrap(checksumData); |
| |
| // |
| // Creating IPv6 Pseudo Header for checksum calculation according |
| // to RFC 4443 and RFC 2460 |
| // |
| bbChecksum.put(((IPv6) this.parent).getSourceAddress()); |
| bbChecksum.put(((IPv6) this.parent).getDestinationAddress()); |
| bbChecksum.putInt(HEADER_LENGTH + payloadLength); |
| bbChecksum.put((byte) 0); |
| bbChecksum.put((byte) 0); |
| bbChecksum.put((byte) 0); |
| bbChecksum.put(IPv6.PROTOCOL_ICMP6); |
| bbChecksum.put(this.icmpType); |
| bbChecksum.put(this.icmpCode); |
| bbChecksum.put((byte) 0); |
| bbChecksum.put((byte) 0); |
| |
| bbData.put(this.icmpType); |
| bbData.put(this.icmpCode); |
| bbData.putShort(this.checksum); |
| if (payloadData != null) { |
| bbData.put(payloadData); |
| bbChecksum.put(payloadData); |
| } |
| |
| if (this.parent != null && this.parent instanceof IPv6) { |
| ((IPv6) this.parent).setNextHeader(IPv6.PROTOCOL_ICMP6); |
| } |
| |
| // compute checksum if needed |
| if (this.checksum == 0) { |
| bbData.rewind(); |
| bbChecksum.rewind(); |
| int accumulation = 0; |
| |
| for (int i = 0; i < checksumData.length / 2; ++i) { |
| accumulation += 0xffff & bbChecksum.getShort(); |
| } |
| // pad to an even number of shorts |
| if (checksumData.length % 2 > 0) { |
| accumulation += (bbChecksum.get() & 0xff) << 8; |
| } |
| |
| accumulation = (accumulation >> 16 & 0xffff) |
| + (accumulation & 0xffff); |
| this.checksum = (short) (~accumulation & 0xffff); |
| bbData.putShort(2, this.checksum); |
| } |
| return data; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see java.lang.Object#hashCode() |
| */ |
| @Override |
| public int hashCode() { |
| final int prime = 5807; |
| int result = super.hashCode(); |
| result = prime * result + this.icmpType; |
| result = prime * result + this.icmpCode; |
| result = prime * result + this.checksum; |
| 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 ICMP6)) { |
| return false; |
| } |
| final ICMP6 other = (ICMP6) obj; |
| if (this.icmpType != other.icmpType) { |
| return false; |
| } |
| if (this.icmpCode != other.icmpCode) { |
| return false; |
| } |
| if (this.checksum != other.checksum) { |
| return false; |
| } |
| return true; |
| } |
| |
| @Override |
| public IPacket deserialize(final byte[] data, final int offset, |
| final int length) { |
| final ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| this.icmpType = bb.get(); |
| this.icmpCode = bb.get(); |
| this.checksum = bb.getShort(); |
| |
| IPacket payload; |
| if (ICMP6.PROTOCOL_CLASS_MAP.containsKey(this.icmpType)) { |
| final Class<? extends IPacket> clazz = ICMP6.PROTOCOL_CLASS_MAP |
| .get(this.icmpType); |
| try { |
| payload = clazz.newInstance(); |
| } catch (final Exception e) { |
| throw new RuntimeException( |
| "Error parsing payload for ICMP6 packet", e); |
| } |
| } else { |
| payload = new Data(); |
| } |
| this.payload = payload.deserialize(data, bb.position(), |
| bb.limit() - bb.position()); |
| this.payload.setParent(this); |
| |
| return this; |
| } |
| } |