Andreas Wundsam | 40e14f7 | 2013-05-06 14:49:08 -0700 | [diff] [blame] | 1 | package org.openflow.types; |
| 2 | |
| 3 | import java.util.regex.Pattern; |
| 4 | |
| 5 | import org.jboss.netty.buffer.ChannelBuffer; |
| 6 | import org.openflow.exceptions.OFParseError; |
Andreas Wundsam | 40e14f7 | 2013-05-06 14:49:08 -0700 | [diff] [blame] | 7 | |
| 8 | /** |
| 9 | * IPv6 address object. Instance controlled, immutable. Internal representation: |
| 10 | * two 64 bit longs (not that you'd have to know). |
| 11 | * |
| 12 | * @author Andreas Wundsam <andreas.wundsam@teleteach.de> |
| 13 | */ |
Yotam Harchol | 5c9d6f4 | 2013-08-01 11:09:20 -0700 | [diff] [blame] | 14 | public class IPv6 implements OFValueType<IPv6> { |
Andreas Wundsam | 40e14f7 | 2013-05-06 14:49:08 -0700 | [diff] [blame] | 15 | static final int LENGTH = 16; |
| 16 | private final long raw1; |
| 17 | private final long raw2; |
| 18 | |
| 19 | private IPv6(final long raw1, final long raw2) { |
| 20 | this.raw1 = raw1; |
| 21 | this.raw2 = raw2; |
| 22 | } |
| 23 | |
| 24 | public static IPv6 of(final byte[] address) { |
| 25 | if (address.length != LENGTH) { |
| 26 | throw new IllegalArgumentException( |
| 27 | "Invalid byte array length for IPv6 address: " + address); |
| 28 | } |
| 29 | |
| 30 | long raw1 = |
| 31 | (address[0] & 0xFFL) << 56 | (address[1] & 0xFFL) << 48 |
| 32 | | (address[2] & 0xFFL) << 40 | (address[3] & 0xFFL) << 32 |
| 33 | | (address[4] & 0xFFL) << 24 | (address[5] & 0xFFL) << 16 |
| 34 | | (address[6] & 0xFFL) << 8 | (address[7]); |
| 35 | |
| 36 | long raw2 = |
| 37 | (address[8] & 0xFFL) << 56 | (address[9] & 0xFFL) << 48 |
| 38 | | (address[10] & 0xFFL) << 40 | (address[11] & 0xFFL) << 32 |
| 39 | | (address[12] & 0xFFL) << 24 | (address[13] & 0xFFL) << 16 |
| 40 | | (address[14] & 0xFFL) << 8 | (address[15]); |
| 41 | |
| 42 | return IPv6.of(raw1, raw2); |
| 43 | } |
| 44 | |
| 45 | private static class IPv6Builder { |
| 46 | private long raw1, raw2; |
| 47 | |
| 48 | public void setUnsignedShortWord(final int i, final int value) { |
| 49 | int shift = 48 - (i % 4) * 16; |
| 50 | |
| 51 | if (value < 0 || value > 0xFFFF) |
| 52 | throw new IllegalArgumentException("16 bit word must be in [0, 0xFFFF]"); |
| 53 | |
| 54 | if (i >= 0 && i < 4) |
| 55 | raw1 = raw1 & ~(0xFFFFL << shift) | (value & 0xFFFFL) << shift; |
| 56 | else if (i >= 4 && i < 8) |
| 57 | raw2 = raw2 & ~(0xFFFFL << shift) | (value & 0xFFFFL) << shift; |
| 58 | else |
| 59 | throw new IllegalArgumentException("16 bit word index must be in [0,7]"); |
| 60 | } |
| 61 | |
| 62 | public IPv6 getIPv6() { |
| 63 | return IPv6.of(raw1, raw2); |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | private final static Pattern colonPattern = Pattern.compile(":"); |
| 68 | |
| 69 | public static IPv6 of(final String string) { |
| 70 | IPv6Builder builder = new IPv6Builder(); |
| 71 | String[] parts = colonPattern.split(string, -1); |
| 72 | |
| 73 | int leftWord = 0; |
| 74 | int leftIndex = 0; |
| 75 | |
| 76 | boolean hitZeroCompression = false; |
| 77 | |
| 78 | for (leftIndex = 0; leftIndex < parts.length; leftIndex++) { |
| 79 | String part = parts[leftIndex]; |
| 80 | if (part.length() == 0) { |
| 81 | // hit empty group of zero compression |
| 82 | hitZeroCompression = true; |
| 83 | break; |
| 84 | } |
| 85 | builder.setUnsignedShortWord(leftWord++, Integer.parseInt(part, 16)); |
| 86 | } |
| 87 | |
| 88 | if (hitZeroCompression) { |
| 89 | if (leftIndex == 0) { |
| 90 | // if colon is at the start, two columns must be at the start, |
| 91 | // move to the second empty group |
| 92 | leftIndex = 1; |
| 93 | if (parts.length < 2 || parts[1].length() > 0) |
| 94 | throw new IllegalArgumentException("Malformed IPv6 address: " + string); |
| 95 | } |
| 96 | |
| 97 | int rightWord = 7; |
| 98 | int rightIndex; |
| 99 | for (rightIndex = parts.length - 1; rightIndex > leftIndex; rightIndex--) { |
| 100 | String part = parts[rightIndex]; |
| 101 | if (part.length() == 0) |
| 102 | break; |
| 103 | builder.setUnsignedShortWord(rightWord--, Integer.parseInt(part, 16)); |
| 104 | } |
| 105 | if (rightIndex == parts.length - 1) { |
| 106 | // if colon is at the end, two columns must be at the end, move |
| 107 | // to the second empty group |
| 108 | if (rightIndex < 1 || parts[rightIndex - 1].length() > 0) |
| 109 | throw new IllegalArgumentException("Malformed IPv6 address: " + string); |
| 110 | rightIndex--; |
| 111 | } |
| 112 | if (leftIndex != rightIndex) |
| 113 | throw new IllegalArgumentException("Malformed IPv6 address: " + string); |
| 114 | } else { |
| 115 | if (leftIndex != 8) { |
| 116 | throw new IllegalArgumentException("Malformed IPv6 address: " + string); |
| 117 | } |
| 118 | } |
| 119 | return builder.getIPv6(); |
| 120 | } |
| 121 | |
| 122 | public static IPv6 of(final long raw1, final long raw2) { |
| 123 | return new IPv6(raw1, raw2); |
| 124 | } |
| 125 | |
| 126 | volatile byte[] bytesCache = null; |
| 127 | |
| 128 | public byte[] getBytes() { |
| 129 | if (bytesCache == null) { |
| 130 | synchronized (this) { |
| 131 | if (bytesCache == null) { |
| 132 | bytesCache = |
| 133 | new byte[] { (byte) ((raw1 >> 56) & 0xFF), |
| 134 | (byte) ((raw1 >> 48) & 0xFF), |
| 135 | (byte) ((raw1 >> 40) & 0xFF), |
| 136 | (byte) ((raw1 >> 32) & 0xFF), |
| 137 | (byte) ((raw1 >> 24) & 0xFF), |
| 138 | (byte) ((raw1 >> 16) & 0xFF), |
| 139 | (byte) ((raw1 >> 8) & 0xFF), |
| 140 | (byte) ((raw1 >> 0) & 0xFF), |
| 141 | |
| 142 | (byte) ((raw2 >> 56) & 0xFF), |
| 143 | (byte) ((raw2 >> 48) & 0xFF), |
| 144 | (byte) ((raw2 >> 40) & 0xFF), |
| 145 | (byte) ((raw2 >> 32) & 0xFF), |
| 146 | (byte) ((raw2 >> 24) & 0xFF), |
| 147 | (byte) ((raw2 >> 16) & 0xFF), |
| 148 | (byte) ((raw2 >> 8) & 0xFF), |
| 149 | (byte) ((raw2 >> 0) & 0xFF) }; |
| 150 | } |
| 151 | } |
| 152 | } |
| 153 | return bytesCache; |
| 154 | } |
| 155 | |
| 156 | @Override |
| 157 | public int getLength() { |
| 158 | return LENGTH; |
| 159 | } |
| 160 | |
Andreas Wundsam | 40e14f7 | 2013-05-06 14:49:08 -0700 | [diff] [blame] | 161 | @Override |
| 162 | public String toString() { |
| 163 | return toString(true, false); |
| 164 | } |
| 165 | |
| 166 | public int getUnsignedShortWord(final int i) { |
| 167 | if (i >= 0 && i < 4) |
| 168 | return (int) ((raw1 >>> (48 - i * 16)) & 0xFFFF); |
| 169 | else if (i >= 4 && i < 8) |
| 170 | return (int) ((raw2 >>> (48 - (i - 4) * 16)) & 0xFFFF); |
| 171 | else |
| 172 | throw new IllegalArgumentException("16 bit word index must be in [0,7]"); |
| 173 | } |
| 174 | |
| 175 | /** get the index of the first word where to apply IPv6 zero compression */ |
| 176 | public int getZeroCompressStart() { |
| 177 | int start = Integer.MAX_VALUE; |
| 178 | int maxLength = -1; |
| 179 | |
| 180 | int candidateStart = -1; |
| 181 | |
| 182 | for (int i = 0; i < 8; i++) { |
| 183 | if (candidateStart >= 0) { |
| 184 | // in a zero octect |
| 185 | if (getUnsignedShortWord(i) != 0) { |
| 186 | // end of this candidate word |
| 187 | int candidateLength = i - candidateStart; |
| 188 | if (candidateLength >= maxLength) { |
| 189 | start = candidateStart; |
| 190 | maxLength = candidateLength; |
| 191 | } |
| 192 | candidateStart = -1; |
| 193 | } |
| 194 | } else { |
| 195 | // not in a zero octect |
| 196 | if (getUnsignedShortWord(i) == 0) { |
| 197 | candidateStart = i; |
| 198 | } |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | if (candidateStart >= 0) { |
| 203 | int candidateLength = 8 - candidateStart; |
| 204 | if (candidateLength >= maxLength) { |
| 205 | start = candidateStart; |
| 206 | maxLength = candidateLength; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | return start; |
| 211 | } |
| 212 | |
| 213 | public String toString(final boolean zeroCompression, final boolean leadingZeros) { |
| 214 | StringBuilder res = new StringBuilder(); |
| 215 | |
| 216 | int compressionStart = zeroCompression ? getZeroCompressStart() : Integer.MAX_VALUE; |
| 217 | boolean inCompression = false; |
| 218 | boolean colonNeeded = false; |
| 219 | |
| 220 | for (int i = 0; i < 8; i++) { |
| 221 | int word = getUnsignedShortWord(i); |
| 222 | |
| 223 | if (word == 0) { |
| 224 | if (inCompression) |
| 225 | continue; |
| 226 | else if (i == compressionStart) { |
| 227 | res.append(':').append(':'); |
| 228 | inCompression = true; |
| 229 | colonNeeded = false; |
| 230 | continue; |
| 231 | } |
| 232 | } else { |
| 233 | inCompression = false; |
| 234 | } |
| 235 | |
| 236 | if (colonNeeded) { |
| 237 | res.append(':'); |
| 238 | colonNeeded = false; |
| 239 | } |
| 240 | |
| 241 | res.append(leadingZeros ? String.format("%04x", word) : Integer.toString(word, |
| 242 | 16)); |
| 243 | colonNeeded = true; |
| 244 | } |
| 245 | return res.toString(); |
| 246 | } |
| 247 | |
| 248 | @Override |
| 249 | public int hashCode() { |
| 250 | final int prime = 31; |
| 251 | int result = 1; |
| 252 | result = prime * result + (int) (raw1 ^ (raw1 >>> 32)); |
| 253 | result = prime * result + (int) (raw2 ^ (raw2 >>> 32)); |
| 254 | return result; |
| 255 | } |
| 256 | |
| 257 | @Override |
| 258 | public boolean equals(final Object obj) { |
| 259 | if (this == obj) |
| 260 | return true; |
| 261 | if (obj == null) |
| 262 | return false; |
| 263 | if (getClass() != obj.getClass()) |
| 264 | return false; |
| 265 | IPv6 other = (IPv6) obj; |
| 266 | if (raw1 != other.raw1) |
| 267 | return false; |
| 268 | if (raw2 != other.raw2) |
| 269 | return false; |
| 270 | return true; |
| 271 | } |
Yotam Harchol | 161a5d5 | 2013-07-25 17:17:48 -0700 | [diff] [blame] | 272 | |
Yotam Harchol | d7b8420 | 2013-07-26 16:08:10 -0700 | [diff] [blame] | 273 | public void write16Bytes(ChannelBuffer c) { |
| 274 | c.writeLong(this.raw1); |
| 275 | c.writeLong(this.raw2); |
Yotam Harchol | 161a5d5 | 2013-07-25 17:17:48 -0700 | [diff] [blame] | 276 | } |
Andreas Wundsam | 40e14f7 | 2013-05-06 14:49:08 -0700 | [diff] [blame] | 277 | |
Yotam Harchol | d7b8420 | 2013-07-26 16:08:10 -0700 | [diff] [blame] | 278 | public static IPv6 read16Bytes(ChannelBuffer c) throws OFParseError { |
| 279 | return IPv6.of(c.readLong(), c.readLong()); |
| 280 | } |
Yotam Harchol | 5c9d6f4 | 2013-08-01 11:09:20 -0700 | [diff] [blame] | 281 | |
| 282 | @Override |
| 283 | public IPv6 applyMask(IPv6 mask) { |
| 284 | return IPv6.of(this.raw1 & mask.raw1, this.raw2 & mask.raw2); |
| 285 | } |
Andreas Wundsam | 40e14f7 | 2013-05-06 14:49:08 -0700 | [diff] [blame] | 286 | } |