The Tcpdump Group git mirrors - tcpdump/blob - extract.h

   1 /*
   2  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 /*
  23  * For 8-bit values; needed to fetch a one-byte value.  Byte order
  24  * isn't relevant, and alignment isn't an issue.
  25  */
  26 #define EXTRACT_U_1(p)  (*(p))
  27 #define EXTRACT_S_1(p)  ((int8_t)(*(p)))
  28
  29 /*
  30  * Inline functions or macros to extract possibly-unaligned big-endian
  31  * integral values.
  32  */
  33 #include "funcattrs.h"
  34
  35 /*
  36  * If we have versions of GCC or Clang that support an __attribute__
  37  * to say "if we're building with unsigned behavior sanitization,
  38  * don't complain about undefined behavior in this function", we
  39  * label these functions with that attribute - we *know* it's undefined
  40  * in the C standard, but we *also* know it does what we want with
  41  * the ISA we're targeting and the compiler we're using.
  42  *
  43  * For GCC 4.9.0 and later, we use __attribute__((no_sanitize_undefined));
  44  * pre-5.0 GCC doesn't have __has_attribute, and I'm not sure whether
  45  * GCC or Clang first had __attribute__((no_sanitize(XXX)).
  46  *
  47  * For Clang, we check for __attribute__((no_sanitize(XXX)) with
  48  * __has_attribute, as there are versions of Clang that support
  49  * __attribute__((no_sanitize("undefined")) but don't support
  50  * __attribute__((no_sanitize_undefined)).
  51  *
  52  * We define this here, rather than in funcattrs.h, because we
  53  * only want it used here, we don't want it to be broadly used.
  54  * (Any printer will get this defined, but this should at least
  55  * make it harder for people to find.)
  56  */
  57 #if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 409)
  58 #define UNALIGNED_OK    __attribute__((no_sanitize_undefined))
  59 #elif __has_attribute(no_sanitize)
  60 #define UNALIGNED_OK    __attribute__((no_sanitize("undefined")))
  61 #else
  62 #define UNALIGNED_OK
  63 #endif
  64
  65 #if (defined(__i386__) || defined(_M_IX86) || defined(__X86__) || defined(__x86_64__) || defined(_M_X64)) || \
  66     (defined(__arm__) || defined(_M_ARM) || defined(__aarch64__)) || \
  67     (defined(__m68k__) && (!defined(__mc68000__) && !defined(__mc68010__))) || \
  68     (defined(__ppc__) || defined(__ppc64__) || defined(_M_PPC) || defined(_ARCH_PPC) || defined(_ARCH_PPC64)) || \
  69     (defined(__s390__) || defined(__s390x__) || defined(__zarch__))
  70 /*
  71  * The processor natively handles unaligned loads, so we can just
  72  * cast the pointer and fetch through it.
  73  *
  74  * XXX - are those all the x86 tests we need?
  75  * XXX - do we need to worry about ARMv1 through ARMv5, which didn't
  76  * support unaligned loads, and, if so, do we need to worry about all
  77  * of them, or just some of them, e.g. ARMv5?
  78  * XXX - are those the only 68k tests we need not to generated
  79  * unaligned accesses if the target is the 68000 or 68010?
  80  * XXX - are there any tests we don't need, because some definitions are for
  81  * compilers that also predefine the GCC symbols?
  82  * XXX - do we need to test for both 32-bit and 64-bit versions of those
  83  * architectures in all cases?
  84  */
  85 static inline uint16_t UNALIGNED_OK
  86 EXTRACT_BE_U_2(const void *p)
  87 {
  88         return ((uint16_t)ntohs(*(const uint16_t *)(p)));
  89 }
  90
  91 static inline int16_t UNALIGNED_OK
  92 EXTRACT_BE_S_2(const void *p)
  93 {
  94         return ((int16_t)ntohs(*(const int16_t *)(p)));
  95 }
  96
  97 static inline uint32_t UNALIGNED_OK
  98 EXTRACT_BE_U_4(const void *p)
  99 {
 100         return ((uint32_t)ntohl(*(const uint32_t *)(p)));
 101 }
 102
 103 static inline int32_t UNALIGNED_OK
 104 EXTRACT_BE_S_4(const void *p)
 105 {
 106         return ((int32_t)ntohl(*(const int32_t *)(p)));
 107 }
 108
 109 static inline uint64_t UNALIGNED_OK
 110 EXTRACT_BE_U_8(const void *p)
 111 {
 112         return ((uint64_t)(((uint64_t)ntohl(*((const uint32_t *)(p) + 0))) << 32 |
 113                 ((uint64_t)ntohl(*((const uint32_t *)(p) + 1))) << 0));
 114
 115 }
 116
 117 static inline int64_t UNALIGNED_OK
 118 EXTRACT_BE_S_8(const void *p)
 119 {
 120         return ((int64_t)(((int64_t)ntohl(*((const uint32_t *)(p) + 0))) << 32 |
 121                 ((uint64_t)ntohl(*((const uint32_t *)(p) + 1))) << 0));
 122
 123 }
 124 #elif defined(__GNUC__) && defined(HAVE___ATTRIBUTE__) && \
 125     (defined(__alpha) || defined(__alpha__) || \
 126      defined(__mips) || defined(__mips__))
 127 /*
 128  * This is MIPS or Alpha, which don't natively handle unaligned loads,
 129  * but which have instructions that can help when doing unaligned
 130  * loads, and this is a GCC-compatible compiler and we have __attribute__,
 131  * which we assume that mean we have __attribute__((packed)), which
 132  * we can use to convince the compiler to generate those instructions.
 133  *
 134  * Declare packed structures containing a uint16_t and a uint32_t,
 135  * cast the pointer to point to one of those, and fetch through it;
 136  * the GCC manual doesn't appear to explicitly say that
 137  * __attribute__((packed)) causes the compiler to generate unaligned-safe
 138  * code, but it apppears to do so.
 139  *
 140  * We do this in case the compiler can generate code using those
 141  * instructions to do an unaligned load and pass stuff to "ntohs()" or
 142  * "ntohl()", which might be better than than the code to fetch the
 143  * bytes one at a time and assemble them.  (That might not be the
 144  * case on a little-endian platform, such as DEC's MIPS machines and
 145  * Alpha machines, where "ntohs()" and "ntohl()" might not be done
 146  * inline.)
 147  *
 148  * We do this only for specific architectures because, for example,
 149  * at least some versions of GCC, when compiling for 64-bit SPARC,
 150  * generate code that assumes alignment if we do this.
 151  *
 152  * XXX - add other architectures and compilers as possible and
 153  * appropriate.
 154  *
 155  * HP's C compiler, indicated by __HP_cc being defined, supports
 156  * "#pragma unaligned N" in version A.05.50 and later, where "N"
 157  * specifies a number of bytes at which the typedef on the next
 158  * line is aligned, e.g.
 159  *
 160  *      #pragma unalign 1
 161  *      typedef uint16_t unaligned_uint16_t;
 162  *
 163  * to define unaligned_uint16_t as a 16-bit unaligned data type.
 164  * This could be presumably used, in sufficiently recent versions of
 165  * the compiler, with macros similar to those below.  This would be
 166  * useful only if that compiler could generate better code for PA-RISC
 167  * or Itanium than would be generated by a bunch of shifts-and-ORs.
 168  *
 169  * DEC C, indicated by __DECC being defined, has, at least on Alpha,
 170  * an __unaligned qualifier that can be applied to pointers to get the
 171  * compiler to generate code that does unaligned loads and stores when
 172  * dereferencing the pointer in question.
 173  *
 174  * XXX - what if the native C compiler doesn't support
 175  * __attribute__((packed))?  How can we get it to generate unaligned
 176  * accesses for *specific* items?
 177  */
 178 typedef struct {
 179         uint16_t        val;
 180 } __attribute__((packed)) unaligned_uint16_t;
 181
 182 typedef struct {
 183         int16_t         val;
 184 } __attribute__((packed)) unaligned_int16_t;
 185
 186 typedef struct {
 187         uint32_t        val;
 188 } __attribute__((packed)) unaligned_uint32_t;
 189
 190 typedef struct {
 191         int32_t         val;
 192 } __attribute__((packed)) unaligned_int32_t;
 193
 194 UNALIGNED_OK static inline uint16_t
 195 EXTRACT_BE_U_2(const void *p)
 196 {
 197         return ((uint16_t)ntohs(((const unaligned_uint16_t *)(p))->val));
 198 }
 199
 200 UNALIGNED_OK static inline int16_t
 201 EXTRACT_BE_S_2(const void *p)
 202 {
 203         return ((int16_t)ntohs(((const unaligned_int16_t *)(p))->val));
 204 }
 205
 206 UNALIGNED_OK static inline uint32_t
 207 EXTRACT_BE_U_4(const void *p)
 208 {
 209         return ((uint32_t)ntohl(((const unaligned_uint32_t *)(p))->val));
 210 }
 211
 212 UNALIGNED_OK static inline int32_t
 213 EXTRACT_BE_S_4(const void *p)
 214 {
 215         return ((int32_t)ntohl(((const unaligned_int32_t *)(p))->val));
 216 }
 217
 218 UNALIGNED_OK static inline uint64_t
 219 EXTRACT_BE_U_8(const void *p)
 220 {
 221         return ((uint64_t)(((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 0)->val)) << 32 |
 222                 ((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 1)->val)) << 0));
 223 }
 224
 225 UNALIGNED_OK static inline int64_t
 226 EXTRACT_BE_S_8(const void *p)
 227 {
 228         return ((int64_t)(((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 0)->val)) << 32 |
 229                 ((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 1)->val)) << 0));
 230 }
 231 #else
 232 /*
 233  * This architecture doesn't natively support unaligned loads, and either
 234  * this isn't a GCC-compatible compiler, we don't have __attribute__,
 235  * or we do but we don't know of any better way with this instruction
 236  * set to do unaligned loads, so do unaligned loads of big-endian
 237  * quantities the hard way - fetch the bytes one at a time and
 238  * assemble them.
 239  */
 240 #define EXTRACT_BE_U_2(p) \
 241         ((uint16_t)(((uint16_t)(*((const uint8_t *)(p) + 0)) << 8) | \
 242                     ((uint16_t)(*((const uint8_t *)(p) + 1)) << 0)))
 243 #define EXTRACT_BE_S_2(p) \
 244         ((int16_t)(((uint16_t)(*((const uint8_t *)(p) + 0)) << 8) | \
 245                    ((uint16_t)(*((const uint8_t *)(p) + 1)) << 0)))
 246 #define EXTRACT_BE_U_4(p) \
 247         ((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 24) | \
 248                     ((uint32_t)(*((const uint8_t *)(p) + 1)) << 16) | \
 249                     ((uint32_t)(*((const uint8_t *)(p) + 2)) << 8) | \
 250                     ((uint32_t)(*((const uint8_t *)(p) + 3)) << 0)))
 251 #define EXTRACT_BE_S_4(p) \
 252         ((int32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 24) | \
 253                    ((uint32_t)(*((const uint8_t *)(p) + 1)) << 16) | \
 254                    ((uint32_t)(*((const uint8_t *)(p) + 2)) << 8) | \
 255                    ((uint32_t)(*((const uint8_t *)(p) + 3)) << 0)))
 256 #define EXTRACT_BE_U_8(p) \
 257         ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 56) | \
 258                     ((uint64_t)(*((const uint8_t *)(p) + 1)) << 48) | \
 259                     ((uint64_t)(*((const uint8_t *)(p) + 2)) << 40) | \
 260                     ((uint64_t)(*((const uint8_t *)(p) + 3)) << 32) | \
 261                     ((uint64_t)(*((const uint8_t *)(p) + 4)) << 24) | \
 262                     ((uint64_t)(*((const uint8_t *)(p) + 5)) << 16) | \
 263                     ((uint64_t)(*((const uint8_t *)(p) + 6)) << 8) | \
 264                     ((uint64_t)(*((const uint8_t *)(p) + 7)) << 0)))
 265 #define EXTRACT_BE_S_8(p) \
 266         ((int64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 56) | \
 267                    ((uint64_t)(*((const uint8_t *)(p) + 1)) << 48) | \
 268                    ((uint64_t)(*((const uint8_t *)(p) + 2)) << 40) | \
 269                    ((uint64_t)(*((const uint8_t *)(p) + 3)) << 32) | \
 270                    ((uint64_t)(*((const uint8_t *)(p) + 4)) << 24) | \
 271                    ((uint64_t)(*((const uint8_t *)(p) + 5)) << 16) | \
 272                    ((uint64_t)(*((const uint8_t *)(p) + 6)) << 8) | \
 273                    ((uint64_t)(*((const uint8_t *)(p) + 7)) << 0)))
 274 #endif /* unaligned access checks */
 275
 276 #define EXTRACT_BE_U_3(p) \
 277         ((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 16) | \
 278                     ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
 279                     ((uint32_t)(*((const uint8_t *)(p) + 2)) << 0)))
 280
 281 #define EXTRACT_BE_S_3(p) \
 282         (((*((const uint8_t *)(p) + 0)) & 0x80) ? \
 283           ((int32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 16) | \
 284                      ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
 285                      ((uint32_t)(*((const uint8_t *)(p) + 2)) << 0))) : \
 286           ((int32_t)(0xFF000000U | \
 287                      ((uint32_t)(*((const uint8_t *)(p) + 0)) << 16) | \
 288                      ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
 289                      ((uint32_t)(*((const uint8_t *)(p) + 2)) << 0))))
 290
 291 #define EXTRACT_BE_U_5(p) \
 292         ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 32) | \
 293                     ((uint64_t)(*((const uint8_t *)(p) + 1)) << 24) | \
 294                     ((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
 295                     ((uint64_t)(*((const uint8_t *)(p) + 3)) << 8) | \
 296                     ((uint64_t)(*((const uint8_t *)(p) + 4)) << 0)))
 297
 298 #define EXTRACT_BE_S_5(p) \
 299         (((*((const uint8_t *)(p) + 0)) & 0x80) ? \
 300           ((int64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 32) | \
 301                      ((uint64_t)(*((const uint8_t *)(p) + 1)) << 24) | \
 302                      ((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
 303                      ((uint64_t)(*((const uint8_t *)(p) + 3)) << 8) | \
 304                      ((uint64_t)(*((const uint8_t *)(p) + 4)) << 0))) : \
 305           ((int64_t)(INT64_T_CONSTANT(0xFFFFFF0000000000U) | \
 306                      ((uint64_t)(*((const uint8_t *)(p) + 0)) << 32) | \
 307                      ((uint64_t)(*((const uint8_t *)(p) + 1)) << 24) | \
 308                      ((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
 309                      ((uint64_t)(*((const uint8_t *)(p) + 3)) << 8) | \
 310                      ((uint64_t)(*((const uint8_t *)(p) + 4)) << 0))))
 311
 312 #define EXTRACT_BE_U_6(p) \
 313         ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 40) | \
 314                     ((uint64_t)(*((const uint8_t *)(p) + 1)) << 32) | \
 315                     ((uint64_t)(*((const uint8_t *)(p) + 2)) << 24) | \
 316                     ((uint64_t)(*((const uint8_t *)(p) + 3)) << 16) | \
 317                     ((uint64_t)(*((const uint8_t *)(p) + 4)) << 8) | \
 318                     ((uint64_t)(*((const uint8_t *)(p) + 5)) << 0)))
 319
 320 #define EXTRACT_BE_S_6(p) \
 321         (((*((const uint8_t *)(p) + 0)) & 0x80) ? \
 322           ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 40) | \
 323                       ((uint64_t)(*((const uint8_t *)(p) + 1)) << 32) | \
 324                       ((uint64_t)(*((const uint8_t *)(p) + 2)) << 24) | \
 325                       ((uint64_t)(*((const uint8_t *)(p) + 3)) << 16) | \
 326                       ((uint64_t)(*((const uint8_t *)(p) + 4)) << 8) | \
 327                       ((uint64_t)(*((const uint8_t *)(p) + 5)) << 0))) : \
 328           ((int64_t)(INT64_T_CONSTANT(0xFFFFFFFF00000000U) | \
 329                       ((uint64_t)(*((const uint8_t *)(p) + 0)) << 40) | \
 330                       ((uint64_t)(*((const uint8_t *)(p) + 1)) << 32) | \
 331                       ((uint64_t)(*((const uint8_t *)(p) + 2)) << 24) | \
 332                       ((uint64_t)(*((const uint8_t *)(p) + 3)) << 16) | \
 333                       ((uint64_t)(*((const uint8_t *)(p) + 4)) << 8) | \
 334                       ((uint64_t)(*((const uint8_t *)(p) + 5)) << 0))))
 335
 336 #define EXTRACT_BE_U_7(p) \
 337         ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 48) | \
 338                     ((uint64_t)(*((const uint8_t *)(p) + 1)) << 40) | \
 339                     ((uint64_t)(*((const uint8_t *)(p) + 2)) << 32) | \
 340                     ((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
 341                     ((uint64_t)(*((const uint8_t *)(p) + 4)) << 16) | \
 342                     ((uint64_t)(*((const uint8_t *)(p) + 5)) << 8) | \
 343                     ((uint64_t)(*((const uint8_t *)(p) + 6)) << 0)))
 344
 345 #define EXTRACT_BE_S_7(p) \
 346         (((*((const uint8_t *)(p) + 0)) & 0x80) ? \
 347           ((int64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 48) | \
 348                      ((uint64_t)(*((const uint8_t *)(p) + 1)) << 40) | \
 349                      ((uint64_t)(*((const uint8_t *)(p) + 2)) << 32) | \
 350                      ((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
 351                      ((uint64_t)(*((const uint8_t *)(p) + 4)) << 16) | \
 352                      ((uint64_t)(*((const uint8_t *)(p) + 5)) << 8) | \
 353                      ((uint64_t)(*((const uint8_t *)(p) + 6)) << 0))) : \
 354             ((int64_t)(INT64_T_CONSTANT(0xFFFFFFFFFF000000U) | \
 355                      ((uint64_t)(*((const uint8_t *)(p) + 0)) << 48) | \
 356                      ((uint64_t)(*((const uint8_t *)(p) + 1)) << 40) | \
 357                      ((uint64_t)(*((const uint8_t *)(p) + 2)) << 32) | \
 358                      ((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
 359                      ((uint64_t)(*((const uint8_t *)(p) + 4)) << 16) | \
 360                      ((uint64_t)(*((const uint8_t *)(p) + 5)) << 8) | \
 361                      ((uint64_t)(*((const uint8_t *)(p) + 6)) << 0))))
 362
 363 /*
 364  * Macros to extract possibly-unaligned little-endian integral values.
 365  * XXX - do loads on little-endian machines that support unaligned loads?
 366  */
 367 #define EXTRACT_LE_U_2(p) \
 368         ((uint16_t)(((uint16_t)(*((const uint8_t *)(p) + 1)) << 8) | \
 369                     ((uint16_t)(*((const uint8_t *)(p) + 0)) << 0)))
 370 #define EXTRACT_LE_S_2(p) \
 371         ((int16_t)(((uint16_t)(*((const uint8_t *)(p) + 1)) << 8) | \
 372                    ((uint16_t)(*((const uint8_t *)(p) + 0)) << 0)))
 373 #define EXTRACT_LE_U_4(p) \
 374         ((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 3)) << 24) | \
 375                     ((uint32_t)(*((const uint8_t *)(p) + 2)) << 16) | \
 376                     ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
 377                     ((uint32_t)(*((const uint8_t *)(p) + 0)) << 0)))
 378 #define EXTRACT_LE_S_4(p) \
 379         ((int32_t)(((uint32_t)(*((const uint8_t *)(p) + 3)) << 24) | \
 380                    ((uint32_t)(*((const uint8_t *)(p) + 2)) << 16) | \
 381                    ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
 382                    ((uint32_t)(*((const uint8_t *)(p) + 0)) << 0)))
 383 #define EXTRACT_LE_U_3(p) \
 384         ((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 2)) << 16) | \
 385                     ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
 386                     ((uint32_t)(*((const uint8_t *)(p) + 0)) << 0)))
 387 #define EXTRACT_LE_S_3(p) \
 388         ((int32_t)(((uint32_t)(*((const uint8_t *)(p) + 2)) << 16) | \
 389                    ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
 390                    ((uint32_t)(*((const uint8_t *)(p) + 0)) << 0)))
 391 #define EXTRACT_LE_U_8(p) \
 392         ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 7)) << 56) | \
 393                     ((uint64_t)(*((const uint8_t *)(p) + 6)) << 48) | \
 394                     ((uint64_t)(*((const uint8_t *)(p) + 5)) << 40) | \
 395                     ((uint64_t)(*((const uint8_t *)(p) + 4)) << 32) | \
 396                     ((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
 397                     ((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
 398                     ((uint64_t)(*((const uint8_t *)(p) + 1)) << 8) | \
 399                     ((uint64_t)(*((const uint8_t *)(p) + 0)) << 0)))
 400 #define EXTRACT_LE_S_8(p) \
 401         ((int64_t)(((uint64_t)(*((const uint8_t *)(p) + 7)) << 56) | \
 402                    ((uint64_t)(*((const uint8_t *)(p) + 6)) << 48) | \
 403                    ((uint64_t)(*((const uint8_t *)(p) + 5)) << 40) | \
 404                    ((uint64_t)(*((const uint8_t *)(p) + 4)) << 32) | \
 405                    ((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
 406                    ((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
 407                    ((uint64_t)(*((const uint8_t *)(p) + 1)) << 8) | \
 408                    ((uint64_t)(*((const uint8_t *)(p) + 0)) << 0)))
 409
 410 /*
 411  * Macros to check the presence of the values in question.
 412  */
 413 #define ND_TTEST_1(p) ND_TTEST_LEN((p), 1)
 414 #define ND_TCHECK_1(p) ND_TCHECK_LEN((p), 1)
 415
 416 #define ND_TTEST_2(p) ND_TTEST_LEN((p), 2)
 417 #define ND_TCHECK_2(p) ND_TCHECK_LEN((p), 2)
 418
 419 #define ND_TTEST_3(p) ND_TTEST_LEN((p), 3)
 420 #define ND_TCHECK_3(p) ND_TCHECK_LEN((p), 3)
 421
 422 #define ND_TTEST_4(p) ND_TTEST_LEN((p), 4)
 423 #define ND_TCHECK_4(p) ND_TCHECK_LEN((p), 4)
 424
 425 #define ND_TTEST_5(p) ND_TTEST_LEN((p), 5)
 426 #define ND_TCHECK_5(p) ND_TCHECK_LEN((p), 5)
 427
 428 #define ND_TTEST_6(p) ND_TTEST_LEN((p), 6)
 429 #define ND_TCHECK_6(p) ND_TCHECK_LEN((p), 6)
 430
 431 #define ND_TTEST_7(p) ND_TTEST_LEN((p), 7)
 432 #define ND_TCHECK_7(p) ND_TCHECK_LEN((p), 7)
 433
 434 #define ND_TTEST_8(p) ND_TTEST_LEN((p), 8)
 435 #define ND_TCHECK_8(p) ND_TCHECK_LEN((p), 8)
 436
 437 #define ND_TTEST_16(p) ND_TTEST_LEN((p), 16)
 438 #define ND_TCHECK_16(p) ND_TCHECK_LEN((p), 16)