Add a cast to the EXTRACT_U_1() macro

[tcpdump] / extract.h

diff --git a/extract.h b/extract.h
index df5684f4dd638d59261ea989056e7ae7bc7334e3..0ea84e925b4ba5a78b21fbb9f367c9ec74b4201f 100644 (file)
--- a/extract.h
+++ b/extract.h
@@ -17,82 +17,524 @@
  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

+ */
+
+#include <string.h>
+
+/*
+ * For 8-bit values; needed to fetch a one-byte value.  Byte order
+ * isn't relevant, and alignment isn't an issue.
+ */
+#define EXTRACT_U_1(p) ((uint8_t)(*(p)))
+#define EXTRACT_S_1(p) ((int8_t)(*(p)))
+
+/*
+ * Inline functions or macros to extract possibly-unaligned big-endian
+ * integral values.
+ */
+#include "funcattrs.h"
+
+/*
+ * If we have versions of GCC or Clang that support an __attribute__
+ * to say "if we're building with unsigned behavior sanitization,
+ * don't complain about undefined behavior in this function", we
+ * label these functions with that attribute - we *know* it's undefined
+ * in the C standard, but we *also* know it does what we want with
+ * the ISA we're targeting and the compiler we're using.
+ *
+ * For GCC 4.9.0 and later, we use __attribute__((no_sanitize_undefined));
+ * pre-5.0 GCC doesn't have __has_attribute, and I'm not sure whether
+ * GCC or Clang first had __attribute__((no_sanitize(XXX)).

  *
  *

- * @(#) $Header: /tcpdump/master/tcpdump/extract.h,v 1.19 2002-12-11 07:13:51 guy Exp $ (LBL)
+ * For Clang, we check for __attribute__((no_sanitize(XXX)) with
+ * __has_attribute, as there are versions of Clang that support
+ * __attribute__((no_sanitize("undefined")) but don't support
+ * __attribute__((no_sanitize_undefined)).
+ *
+ * We define this here, rather than in funcattrs.h, because we
+ * only want it used here, we don't want it to be broadly used.
+ * (Any printer will get this defined, but this should at least
+ * make it harder for people to find.)

  */
  */

+#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 409)
+#define UNALIGNED_OK   __attribute__((no_sanitize_undefined))
+#elif __has_attribute(no_sanitize)
+#define UNALIGNED_OK   __attribute__((no_sanitize("undefined")))
+#else
+#define UNALIGNED_OK
+#endif
+
+#if (defined(__i386__) || defined(_M_IX86) || defined(__X86__) || defined(__x86_64__) || defined(_M_X64)) || \
+    (defined(__arm__) || defined(_M_ARM) || defined(__aarch64__)) || \
+    (defined(__m68k__) && (!defined(__mc68000__) && !defined(__mc68010__))) || \
+    (defined(__ppc__) || defined(__ppc64__) || defined(_M_PPC) || defined(_ARCH_PPC) || defined(_ARCH_PPC64)) || \
+    (defined(__s390__) || defined(__s390x__) || defined(__zarch__))
+/*
+ * The processor natively handles unaligned loads, so we can just
+ * cast the pointer and fetch through it.
+ *
+ * XXX - are those all the x86 tests we need?
+ * XXX - do we need to worry about ARMv1 through ARMv5, which didn't
+ * support unaligned loads, and, if so, do we need to worry about all
+ * of them, or just some of them, e.g. ARMv5?
+ * XXX - are those the only 68k tests we need not to generated
+ * unaligned accesses if the target is the 68000 or 68010?
+ * XXX - are there any tests we don't need, because some definitions are for
+ * compilers that also predefine the GCC symbols?
+ * XXX - do we need to test for both 32-bit and 64-bit versions of those
+ * architectures in all cases?
+ */
+UNALIGNED_OK static inline uint16_t
+EXTRACT_BE_U_2(const void *p)
+{
+       return ((uint16_t)ntohs(*(const uint16_t *)(p)));
+}
+
+UNALIGNED_OK static inline int16_t
+EXTRACT_BE_S_2(const void *p)
+{
+       return ((int16_t)ntohs(*(const int16_t *)(p)));
+}
+
+UNALIGNED_OK static inline uint32_t
+EXTRACT_BE_U_4(const void *p)
+{
+       return ((uint32_t)ntohl(*(const uint32_t *)(p)));
+}
+
+UNALIGNED_OK static inline int32_t
+EXTRACT_BE_S_4(const void *p)
+{
+       return ((int32_t)ntohl(*(const int32_t *)(p)));
+}
+
+UNALIGNED_OK static inline uint64_t
+EXTRACT_BE_U_8(const void *p)
+{
+       return ((uint64_t)(((uint64_t)ntohl(*((const uint32_t *)(p) + 0))) << 32 |
+               ((uint64_t)ntohl(*((const uint32_t *)(p) + 1))) << 0));

 
 

-/* Network to host order macros */
+}
+
+UNALIGNED_OK static inline int64_t
+EXTRACT_BE_S_8(const void *p)
+{
+       return ((int64_t)(((int64_t)ntohl(*((const uint32_t *)(p) + 0))) << 32 |
+               ((uint64_t)ntohl(*((const uint32_t *)(p) + 1))) << 0));
+
+}

 
 

-#ifdef LBL_ALIGN

 /*
 /*

- * The processor doesn't natively handle unaligned loads.
+ * Extract an IPv4 address, which is in network byte order, and not
+ * necessarily aligned, and provide the result in host byte order.

  */
  */

-#ifdef HAVE___ATTRIBUTE__
+UNALIGNED_OK static inline uint32_t
+EXTRACT_IPV4_TO_HOST_ORDER(const void *p)
+{
+       return ((uint32_t)ntohl(*(const uint32_t *)(p)));
+}
+#elif ND_IS_AT_LEAST_GNUC_VERSION(2,0) && \
+    (defined(__alpha) || defined(__alpha__) || \
+     defined(__mips) || defined(__mips__))

 /*
 /*

- * We have __attribute__; we assume that means we have __attribute__((packed)).
- * Declare packed structures containing a u_int16_t and a u_int32_t,
+ * This is MIPS or Alpha, which don't natively handle unaligned loads,
+ * but which have instructions that can help when doing unaligned
+ * loads, and this is GCC 2.0 or later or a compiler that claims to
+ * be GCC 2.0 or later, which we assume that mean we have
+ * __attribute__((packed)), which we can use to convince the compiler
+ * to generate those instructions.
+ *
+ * Declare packed structures containing a uint16_t and a uint32_t,

  * cast the pointer to point to one of those, and fetch through it;
  * the GCC manual doesn't appear to explicitly say that
  * __attribute__((packed)) causes the compiler to generate unaligned-safe
  * code, but it apppears to do so.
  *
  * cast the pointer to point to one of those, and fetch through it;
  * the GCC manual doesn't appear to explicitly say that
  * __attribute__((packed)) causes the compiler to generate unaligned-safe
  * code, but it apppears to do so.
  *

- * We do this in case the compiler can generate, for this instruction set,
- * better code to do an unaligned load and pass stuff to "ntohs()" or
- * "ntohl()" than the code to fetch the bytes one at a time and
- * assemble them.  (That might not be the case on a little-endian platform,
- * where "ntohs()" and "ntohl()" might not be done inline.)
+ * We do this in case the compiler can generate code using those
+ * instructions to do an unaligned load and pass stuff to "ntohs()" or
+ * "ntohl()", which might be better than than the code to fetch the
+ * bytes one at a time and assemble them.  (That might not be the
+ * case on a little-endian platform, such as DEC's MIPS machines and
+ * Alpha machines, where "ntohs()" and "ntohl()" might not be done
+ * inline.)
+ *
+ * We do this only for specific architectures because, for example,
+ * at least some versions of GCC, when compiling for 64-bit SPARC,
+ * generate code that assumes alignment if we do this.
+ *
+ * XXX - add other architectures and compilers as possible and
+ * appropriate.
+ *
+ * HP's C compiler, indicated by __HP_cc being defined, supports
+ * "#pragma unaligned N" in version A.05.50 and later, where "N"
+ * specifies a number of bytes at which the typedef on the next
+ * line is aligned, e.g.
+ *
+ *     #pragma unalign 1
+ *     typedef uint16_t unaligned_uint16_t;
+ *
+ * to define unaligned_uint16_t as a 16-bit unaligned data type.
+ * This could be presumably used, in sufficiently recent versions of
+ * the compiler, with macros similar to those below.  This would be
+ * useful only if that compiler could generate better code for PA-RISC
+ * or Itanium than would be generated by a bunch of shifts-and-ORs.
+ *
+ * DEC C, indicated by __DECC being defined, has, at least on Alpha,
+ * an __unaligned qualifier that can be applied to pointers to get the
+ * compiler to generate code that does unaligned loads and stores when
+ * dereferencing the pointer in question.
+ *
+ * XXX - what if the native C compiler doesn't support
+ * __attribute__((packed))?  How can we get it to generate unaligned
+ * accesses for *specific* items?

  */
 typedef struct {
  */
 typedef struct {

-       u_int16_t       val;
-} __attribute__((packed)) unaligned_u_int16_t;
+       uint16_t        val;
+} __attribute__((packed)) unaligned_uint16_t;
+
+typedef struct {
+       int16_t         val;
+} __attribute__((packed)) unaligned_int16_t;
+
+typedef struct {
+       uint32_t        val;
+} __attribute__((packed)) unaligned_uint32_t;

 
 typedef struct {
 
 typedef struct {

-       u_int32_t       val;
-} __attribute__((packed)) unaligned_u_int32_t;
-
-#define EXTRACT_16BITS(p) \
-       ((u_int16_t)ntohs(((const unaligned_u_int16_t *)(p))->val))
-#define EXTRACT_32BITS(p) \
-       ((u_int32_t)ntohl(((const unaligned_u_int32_t *)(p))->val))
-#else /* HAVE___ATTRIBUTE__ */
+       int32_t         val;
+} __attribute__((packed)) unaligned_int32_t;
+
+UNALIGNED_OK static inline uint16_t
+EXTRACT_BE_U_2(const void *p)
+{
+       return ((uint16_t)ntohs(((const unaligned_uint16_t *)(p))->val));
+}
+
+UNALIGNED_OK static inline int16_t
+EXTRACT_BE_S_2(const void *p)
+{
+       return ((int16_t)ntohs(((const unaligned_int16_t *)(p))->val));
+}
+
+UNALIGNED_OK static inline uint32_t
+EXTRACT_BE_U_4(const void *p)
+{
+       return ((uint32_t)ntohl(((const unaligned_uint32_t *)(p))->val));
+}
+
+UNALIGNED_OK static inline int32_t
+EXTRACT_BE_S_4(const void *p)
+{
+       return ((int32_t)ntohl(((const unaligned_int32_t *)(p))->val));
+}
+
+UNALIGNED_OK static inline uint64_t
+EXTRACT_BE_U_8(const void *p)
+{
+       return ((uint64_t)(((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 0)->val)) << 32 |
+               ((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 1)->val)) << 0));
+}
+
+UNALIGNED_OK static inline int64_t
+EXTRACT_BE_S_8(const void *p)
+{
+       return ((int64_t)(((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 0)->val)) << 32 |
+               ((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 1)->val)) << 0));
+}
+
+/*
+ * Extract an IPv4 address, which is in network byte order, and not
+ * necessarily aligned, and provide the result in host byte order.
+ */
+UNALIGNED_OK static inline uint32_t
+EXTRACT_IPV4_TO_HOST_ORDER(const void *p)
+{
+       return ((uint32_t)ntohl(((const unaligned_uint32_t *)(p))->val));
+}
+#else

 /*
 /*

- * We don't have __attribute__, so do unaligned loads of big-endian
+ * This architecture doesn't natively support unaligned loads, and either
+ * this isn't a GCC-compatible compiler, we don't have __attribute__,
+ * or we do but we don't know of any better way with this instruction
+ * set to do unaligned loads, so do unaligned loads of big-endian

  * quantities the hard way - fetch the bytes one at a time and
  * assemble them.
  */
  * quantities the hard way - fetch the bytes one at a time and
  * assemble them.
  */

-#define EXTRACT_16BITS(p) \
-       ((u_int16_t)((u_int16_t)*((const u_int8_t *)(p) + 0) << 8 | \
-                    (u_int16_t)*((const u_int8_t *)(p) + 1)))
-#define EXTRACT_32BITS(p) \
-       ((u_int32_t)((u_int32_t)*((const u_int8_t *)(p) + 0) << 24 | \
-                    (u_int32_t)*((const u_int8_t *)(p) + 1) << 16 | \
-                    (u_int32_t)*((const u_int8_t *)(p) + 2) << 8 | \
-                    (u_int32_t)*((const u_int8_t *)(p) + 3)))
-#endif /* HAVE___ATTRIBUTE__ */
-#else /* LBL_ALIGN */
+#define EXTRACT_BE_U_2(p) \
+       ((uint16_t)(((uint16_t)(*((const uint8_t *)(p) + 0)) << 8) | \
+                   ((uint16_t)(*((const uint8_t *)(p) + 1)) << 0)))
+#define EXTRACT_BE_S_2(p) \
+       ((int16_t)(((uint16_t)(*((const uint8_t *)(p) + 0)) << 8) | \
+                  ((uint16_t)(*((const uint8_t *)(p) + 1)) << 0)))
+#define EXTRACT_BE_U_4(p) \
+       ((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 24) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 1)) << 16) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 2)) << 8) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 3)) << 0)))
+#define EXTRACT_BE_S_4(p) \
+       ((int32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 24) | \
+                  ((uint32_t)(*((const uint8_t *)(p) + 1)) << 16) | \
+                  ((uint32_t)(*((const uint8_t *)(p) + 2)) << 8) | \
+                  ((uint32_t)(*((const uint8_t *)(p) + 3)) << 0)))
+#define EXTRACT_BE_U_8(p) \
+       ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 56) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 1)) << 48) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 2)) << 40) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 3)) << 32) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 4)) << 24) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 5)) << 16) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 6)) << 8) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 7)) << 0)))
+#define EXTRACT_BE_S_8(p) \
+       ((int64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 56) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 1)) << 48) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 2)) << 40) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 3)) << 32) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 4)) << 24) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 5)) << 16) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 6)) << 8) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 7)) << 0)))
+

 /*
 /*

- * The processor natively handles unaligned loads, so we can just
- * cast the pointer and fetch through it.
+ * Extract an IPv4 address, which is in network byte order, and not
+ * necessarily aligned, and provide the result in host byte order.
+ */
+#define EXTRACT_IPV4_TO_HOST_ORDER(p) \
+       ((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 24) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 1)) << 16) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 2)) << 8) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 3)) << 0)))
+#endif /* unaligned access checks */
+
+/*
+ * Extract numerical values in *host* byte order.  (Some metadata
+ * headers are in the byte order of the host that wrote the file,
+ * and libpcap translate them to the byte order of the host
+ * reading the file.  This means that if a program on that host
+ * reads with libpcap and writes to a new file, the new file will
+ * be written in the byte order of the host writing the file.  Thus,
+ * the magic number in pcap files and byte-order magic in pcapng
+ * files can be used to determine the byte order in those metadata
+ * headers.)
+ *
+ * XXX - on platforms that can do unaligned accesses, just cast and
+ * dereference the pointer.
+ */
+static inline uint16_t
+EXTRACT_HE_U_2(const void *p)
+{
+       uint16_t val;
+
+       UNALIGNED_MEMCPY(&val, p, sizeof(uint16_t));
+       return val;
+}
+
+static inline int16_t
+EXTRACT_HE_S_2(const void *p)
+{
+       int16_t val;
+
+       UNALIGNED_MEMCPY(&val, p, sizeof(int16_t));
+       return val;
+}
+
+static inline uint32_t
+EXTRACT_HE_U_4(const void *p)
+{
+       uint32_t val;
+
+       UNALIGNED_MEMCPY(&val, p, sizeof(uint32_t));
+       return val;
+}
+
+static inline int32_t
+EXTRACT_HE_S_4(const void *p)
+{
+       int32_t val;
+
+       UNALIGNED_MEMCPY(&val, p, sizeof(int32_t));
+       return val;
+}
+
+/*
+ * Extract an IPv4 address, which is in network byte order, and which
+ * is not necessarily aligned on a 4-byte boundary, and provide the
+ * result in network byte order.
+ *
+ * This works the same way regardless of the host's byte order.
+ */
+static inline uint32_t
+EXTRACT_IPV4_TO_NETWORK_ORDER(const void *p)
+{
+       uint32_t addr;
+
+       UNALIGNED_MEMCPY(&addr, p, sizeof(uint32_t));
+       return addr;
+}
+
+/*
+ * Non-power-of-2 sizes.
+ */
+#define EXTRACT_BE_U_3(p) \
+       ((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 16) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 2)) << 0)))
+
+#define EXTRACT_BE_S_3(p) \
+       (((*((const uint8_t *)(p) + 0)) & 0x80) ? \
+         ((int32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 16) | \
+                    ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+                    ((uint32_t)(*((const uint8_t *)(p) + 2)) << 0))) : \
+         ((int32_t)(0xFF000000U | \
+                    ((uint32_t)(*((const uint8_t *)(p) + 0)) << 16) | \
+                    ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+                    ((uint32_t)(*((const uint8_t *)(p) + 2)) << 0))))
+
+#define EXTRACT_BE_U_5(p) \
+       ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 32) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 1)) << 24) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 3)) << 8) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 4)) << 0)))
+
+#define EXTRACT_BE_S_5(p) \
+       (((*((const uint8_t *)(p) + 0)) & 0x80) ? \
+         ((int64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 32) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 1)) << 24) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 3)) << 8) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 4)) << 0))) : \
+         ((int64_t)(INT64_T_CONSTANT(0xFFFFFF0000000000U) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 0)) << 32) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 1)) << 24) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 3)) << 8) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 4)) << 0))))
+
+#define EXTRACT_BE_U_6(p) \
+       ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 40) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 1)) << 32) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 2)) << 24) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 3)) << 16) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 4)) << 8) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 5)) << 0)))
+
+#define EXTRACT_BE_S_6(p) \
+       (((*((const uint8_t *)(p) + 0)) & 0x80) ? \
+         ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 40) | \
+                     ((uint64_t)(*((const uint8_t *)(p) + 1)) << 32) | \
+                     ((uint64_t)(*((const uint8_t *)(p) + 2)) << 24) | \
+                     ((uint64_t)(*((const uint8_t *)(p) + 3)) << 16) | \
+                     ((uint64_t)(*((const uint8_t *)(p) + 4)) << 8) | \
+                     ((uint64_t)(*((const uint8_t *)(p) + 5)) << 0))) : \
+         ((int64_t)(INT64_T_CONSTANT(0xFFFFFFFF00000000U) | \
+                     ((uint64_t)(*((const uint8_t *)(p) + 0)) << 40) | \
+                     ((uint64_t)(*((const uint8_t *)(p) + 1)) << 32) | \
+                     ((uint64_t)(*((const uint8_t *)(p) + 2)) << 24) | \
+                     ((uint64_t)(*((const uint8_t *)(p) + 3)) << 16) | \
+                     ((uint64_t)(*((const uint8_t *)(p) + 4)) << 8) | \
+                     ((uint64_t)(*((const uint8_t *)(p) + 5)) << 0))))
+
+#define EXTRACT_BE_U_7(p) \
+       ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 48) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 1)) << 40) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 2)) << 32) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 4)) << 16) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 5)) << 8) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 6)) << 0)))
+
+#define EXTRACT_BE_S_7(p) \
+       (((*((const uint8_t *)(p) + 0)) & 0x80) ? \
+         ((int64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 48) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 1)) << 40) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 2)) << 32) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 4)) << 16) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 5)) << 8) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 6)) << 0))) : \
+           ((int64_t)(INT64_T_CONSTANT(0xFFFFFFFFFF000000U) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 0)) << 48) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 1)) << 40) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 2)) << 32) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 4)) << 16) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 5)) << 8) | \
+                    ((uint64_t)(*((const uint8_t *)(p) + 6)) << 0))))
+
+/*
+ * Macros to extract possibly-unaligned little-endian integral values.
+ * XXX - do loads on little-endian machines that support unaligned loads?

  */
  */

-#define EXTRACT_16BITS(p) \
-       ((u_int16_t)ntohs(*(const u_int16_t *)(p)))
-#define EXTRACT_32BITS(p) \
-       ((u_int32_t)ntohl(*(const u_int32_t *)(p)))
-#endif /* LBL_ALIGN */
-
-#define EXTRACT_24BITS(p) \
-       ((u_int32_t)((u_int32_t)*((const u_int8_t *)(p) + 0) << 16 | \
-                    (u_int32_t)*((const u_int8_t *)(p) + 1) << 8 | \
-                    (u_int32_t)*((const u_int8_t *)(p) + 2)))
-
-/* Little endian protocol host order macros */
-
-#define EXTRACT_LE_8BITS(p) (*(p))
-#define EXTRACT_LE_16BITS(p) \
-       ((u_int16_t)((u_int16_t)*((const u_int8_t *)(p) + 1) << 8 | \
-                    (u_int16_t)*((const u_int8_t *)(p) + 0)))
-#define EXTRACT_LE_32BITS(p) \
-       ((u_int32_t)((u_int32_t)*((const u_int8_t *)(p) + 3) << 24 | \
-                    (u_int32_t)*((const u_int8_t *)(p) + 2) << 16 | \
-                    (u_int32_t)*((const u_int8_t *)(p) + 1) << 8 | \
-                    (u_int32_t)*((const u_int8_t *)(p) + 0)))
+#define EXTRACT_LE_U_2(p) \
+       ((uint16_t)(((uint16_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+                   ((uint16_t)(*((const uint8_t *)(p) + 0)) << 0)))
+#define EXTRACT_LE_S_2(p) \
+       ((int16_t)(((uint16_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+                  ((uint16_t)(*((const uint8_t *)(p) + 0)) << 0)))
+#define EXTRACT_LE_U_4(p) \
+       ((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 3)) << 24) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 2)) << 16) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 0)) << 0)))
+#define EXTRACT_LE_S_4(p) \
+       ((int32_t)(((uint32_t)(*((const uint8_t *)(p) + 3)) << 24) | \
+                  ((uint32_t)(*((const uint8_t *)(p) + 2)) << 16) | \
+                  ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+                  ((uint32_t)(*((const uint8_t *)(p) + 0)) << 0)))
+#define EXTRACT_LE_U_3(p) \
+       ((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 2)) << 16) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+                   ((uint32_t)(*((const uint8_t *)(p) + 0)) << 0)))
+#define EXTRACT_LE_S_3(p) \
+       ((int32_t)(((uint32_t)(*((const uint8_t *)(p) + 2)) << 16) | \
+                  ((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+                  ((uint32_t)(*((const uint8_t *)(p) + 0)) << 0)))
+#define EXTRACT_LE_U_8(p) \
+       ((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 7)) << 56) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 6)) << 48) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 5)) << 40) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 4)) << 32) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+                   ((uint64_t)(*((const uint8_t *)(p) + 0)) << 0)))
+#define EXTRACT_LE_S_8(p) \
+       ((int64_t)(((uint64_t)(*((const uint8_t *)(p) + 7)) << 56) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 6)) << 48) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 5)) << 40) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 4)) << 32) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+                  ((uint64_t)(*((const uint8_t *)(p) + 0)) << 0)))
+
+/*
+ * Macros to check the presence of the values in question.
+ */
+#define ND_TTEST_1(p) ND_TTEST_LEN((p), 1)
+#define ND_TCHECK_1(p) ND_TCHECK_LEN((p), 1)
+
+#define ND_TTEST_2(p) ND_TTEST_LEN((p), 2)
+#define ND_TCHECK_2(p) ND_TCHECK_LEN((p), 2)
+
+#define ND_TTEST_3(p) ND_TTEST_LEN((p), 3)
+#define ND_TCHECK_3(p) ND_TCHECK_LEN((p), 3)
+
+#define ND_TTEST_4(p) ND_TTEST_LEN((p), 4)
+#define ND_TCHECK_4(p) ND_TCHECK_LEN((p), 4)
+
+#define ND_TTEST_5(p) ND_TTEST_LEN((p), 5)
+#define ND_TCHECK_5(p) ND_TCHECK_LEN((p), 5)
+
+#define ND_TTEST_6(p) ND_TTEST_LEN((p), 6)
+#define ND_TCHECK_6(p) ND_TCHECK_LEN((p), 6)
+
+#define ND_TTEST_7(p) ND_TTEST_LEN((p), 7)
+#define ND_TCHECK_7(p) ND_TCHECK_LEN((p), 7)
+
+#define ND_TTEST_8(p) ND_TTEST_LEN((p), 8)
+#define ND_TCHECK_8(p) ND_TCHECK_LEN((p), 8)
+
+#define ND_TTEST_16(p) ND_TTEST_LEN((p), 16)
+#define ND_TCHECK_16(p) ND_TCHECK_LEN((p), 16)