Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | |
| 18 | |
Charles M.C. Chan | ea5aa47 | 2015-01-03 13:40:39 +0800 | [diff] [blame^] | 19 | package org.onlab.packet.ndp; |
| 20 | |
| 21 | import org.onlab.packet.BasePacket; |
| 22 | import org.onlab.packet.Data; |
| 23 | import org.onlab.packet.IPacket; |
| 24 | import org.onlab.packet.Ip6Address; |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 25 | |
| 26 | import java.nio.ByteBuffer; |
| 27 | import java.util.Arrays; |
| 28 | |
| 29 | /** |
Charles M.C. Chan | ea5aa47 | 2015-01-03 13:40:39 +0800 | [diff] [blame^] | 30 | * Implements ICMPv6 Neighbor Advertisement packet format. (RFC 4861) |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 31 | */ |
| 32 | public class NeighborAdvertisement extends BasePacket { |
| 33 | public static final byte HEADER_LENGTH = 20; // bytes |
| 34 | |
| 35 | protected byte routerFlag; |
| 36 | protected byte solicitedFlag; |
| 37 | protected byte overrideFlag; |
| 38 | protected byte[] targetAddress = new byte[Ip6Address.BYTE_LENGTH]; |
| 39 | |
| 40 | /** |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 41 | * Gets router flag. |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 42 | * |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 43 | * @return the router flag |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 44 | */ |
| 45 | public byte getRouterFlag() { |
| 46 | return this.routerFlag; |
| 47 | } |
| 48 | |
| 49 | /** |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 50 | * Sets router flag. |
| 51 | * |
| 52 | * @param routerFlag the router flag to set |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 53 | * @return this |
| 54 | */ |
| 55 | public NeighborAdvertisement setRouterFlag(final byte routerFlag) { |
| 56 | this.routerFlag = routerFlag; |
| 57 | return this; |
| 58 | } |
| 59 | |
| 60 | /** |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 61 | * Gets solicited flag. |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 62 | * |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 63 | * @return the solicited flag |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 64 | */ |
| 65 | public byte getSolicitedFlag() { |
| 66 | return this.solicitedFlag; |
| 67 | } |
| 68 | |
| 69 | /** |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 70 | * Sets solicited flag. |
| 71 | * |
| 72 | * @param solicitedFlag the solicited flag to set |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 73 | * @return this |
| 74 | */ |
| 75 | public NeighborAdvertisement setSolicitedFlag(final byte solicitedFlag) { |
| 76 | this.solicitedFlag = solicitedFlag; |
| 77 | return this; |
| 78 | } |
| 79 | |
| 80 | /** |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 81 | * Gets override flag. |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 82 | * |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 83 | * @return the override flag |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 84 | */ |
| 85 | public byte getOverrideFlag() { |
| 86 | return this.overrideFlag; |
| 87 | } |
| 88 | |
| 89 | /** |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 90 | * Sets override flag. |
| 91 | * |
| 92 | * @param overrideFlag the override flag to set |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 93 | * @return this |
| 94 | */ |
| 95 | public NeighborAdvertisement setOverrideFlag(final byte overrideFlag) { |
| 96 | this.overrideFlag = overrideFlag; |
| 97 | return this; |
| 98 | } |
| 99 | |
| 100 | /** |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 101 | * Gets target address. |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 102 | * |
| 103 | * @return the target IPv6 address |
| 104 | */ |
| 105 | public byte[] getTargetAddress() { |
| 106 | return this.targetAddress; |
| 107 | } |
| 108 | |
| 109 | /** |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 110 | * Sets target address. |
| 111 | * |
| 112 | * @param targetAddress the target IPv6 address to set |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 113 | * @return this |
| 114 | */ |
| 115 | public NeighborAdvertisement setTargetAddress(final byte[] targetAddress) { |
| 116 | this.targetAddress = Arrays.copyOfRange(targetAddress, 0, Ip6Address.BYTE_LENGTH); |
| 117 | return this; |
| 118 | } |
| 119 | |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 120 | @Override |
| 121 | public byte[] serialize() { |
| 122 | byte[] payloadData = null; |
| 123 | if (this.payload != null) { |
| 124 | this.payload.setParent(this); |
| 125 | payloadData = this.payload.serialize(); |
| 126 | } |
| 127 | |
| 128 | int payloadLength = payloadData == null ? 0 : (short) payloadData.length; |
| 129 | |
| 130 | final byte[] data = new byte[HEADER_LENGTH + payloadLength]; |
| 131 | final ByteBuffer bb = ByteBuffer.wrap(data); |
| 132 | |
| 133 | bb.putInt((this.routerFlag & 0x1) << 31 | (this.solicitedFlag & 0x1) << 30 | (this.overrideFlag & 0x1) << 29); |
| 134 | bb.put(this.targetAddress, 0, Ip6Address.BYTE_LENGTH); |
| 135 | if (payloadData != null) { |
| 136 | bb.put(payloadData); |
| 137 | } |
| 138 | |
| 139 | return data; |
| 140 | } |
| 141 | |
| 142 | @Override |
| 143 | public IPacket deserialize(byte[] data, int offset, int length) { |
| 144 | final ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| 145 | int iscratch; |
| 146 | |
| 147 | iscratch = bb.getInt(); |
| 148 | this.routerFlag = (byte) (iscratch >> 31 & 0x1); |
| 149 | this.solicitedFlag = (byte) (iscratch >> 30 & 0x1); |
| 150 | this.overrideFlag = (byte) (iscratch >> 29 & 0x1); |
| 151 | bb.get(this.targetAddress, 0, Ip6Address.BYTE_LENGTH); |
| 152 | |
| 153 | this.payload = new Data(); |
| 154 | this.payload = this.payload.deserialize(data, bb.position(), bb.limit() |
| 155 | - bb.position()); |
| 156 | this.payload.setParent(this); |
| 157 | |
| 158 | return this; |
| 159 | } |
| 160 | |
| 161 | /* |
Charles M.C. Chan | 7fee36a | 2014-12-31 00:19:59 +0800 | [diff] [blame] | 162 | * (non-Javadoc) |
| 163 | * |
| 164 | * @see java.lang.Object#hashCode() |
| 165 | */ |
Charles M.C. Chan | 93b7fb0 | 2014-12-28 03:59:36 +0800 | [diff] [blame] | 166 | @Override |
| 167 | public int hashCode() { |
| 168 | final int prime = 5807; |
| 169 | int result = super.hashCode(); |
| 170 | ByteBuffer bb; |
| 171 | result = prime * result + this.routerFlag; |
| 172 | result = prime * result + this.solicitedFlag; |
| 173 | result = prime * result + this.overrideFlag; |
| 174 | bb = ByteBuffer.wrap(this.targetAddress); |
| 175 | for (int i = 0; i < 4; i++) { |
| 176 | result = prime * result + bb.getInt(); |
| 177 | } |
| 178 | return result; |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * (non-Javadoc) |
| 183 | * |
| 184 | * @see java.lang.Object#equals(java.lang.Object) |
| 185 | */ |
| 186 | @Override |
| 187 | public boolean equals(final Object obj) { |
| 188 | if (this == obj) { |
| 189 | return true; |
| 190 | } |
| 191 | if (!super.equals(obj)) { |
| 192 | return false; |
| 193 | } |
| 194 | if (!(obj instanceof NeighborAdvertisement)) { |
| 195 | return false; |
| 196 | } |
| 197 | final NeighborAdvertisement other = (NeighborAdvertisement) obj; |
| 198 | if (this.routerFlag != other.routerFlag) { |
| 199 | return false; |
| 200 | } |
| 201 | if (this.solicitedFlag != other.solicitedFlag) { |
| 202 | return false; |
| 203 | } |
| 204 | if (this.overrideFlag != other.overrideFlag) { |
| 205 | return false; |
| 206 | } |
| 207 | if (!Arrays.equals(this.targetAddress, other.targetAddress)) { |
| 208 | return false; |
| 209 | } |
| 210 | return true; |
| 211 | } |
| 212 | } |