*/
/*
- * Macros to extract possibly-unaligned big-endian integral values.
+ * 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)).
+ *
+ * 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
+
#ifdef LBL_ALIGN
/*
* The processor doesn't natively handle unaligned loads.
defined(__mips) || defined(__mips__))
/*
- * This is a GCC-compatible compiler and we have __attribute__, which
+* This is a GCC-compatible compiler and we have __attribute__, which
* we assume that mean we have __attribute__((packed)), and this is
* MIPS or Alpha, which has instructions that can help when doing
* unaligned loads.
*
- * Declare packed structures containing a u_int16_t and a u_int32_t,
+ * 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
* line is aligned, e.g.
*
* #pragma unalign 1
- * typedef u_int16_t unaligned_u_int16_t;
+ * typedef uint16_t unaligned_uint16_t;
*
- * to define unaligned_u_int16_t as a 16-bit unaligned data type.
+ * 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
* accesses for *specific* items?
*/
typedef struct {
- u_int16_t val;
-} __attribute__((packed)) unaligned_u_int16_t;
+ uint16_t val;
+} __attribute__((packed)) unaligned_uint16_t;
typedef struct {
- u_int32_t val;
-} __attribute__((packed)) unaligned_u_int32_t;
+ uint32_t val;
+} __attribute__((packed)) unaligned_uint32_t;
-static inline u_int16_t
+UNALIGNED_OK static inline uint16_t
EXTRACT_16BITS(const void *p)
{
- return ((u_int16_t)ntohs(((const unaligned_u_int16_t *)(p))->val));
+ return ((uint16_t)ntohs(((const unaligned_uint16_t *)(p))->val));
}
-static inline u_int32_t
+UNALIGNED_OK static inline uint32_t
EXTRACT_32BITS(const void *p)
{
- return ((u_int32_t)ntohl(((const unaligned_u_int32_t *)(p))->val));
+ return ((uint32_t)ntohl(((const unaligned_uint32_t *)(p))->val));
}
-static inline u_int64_t
+UNALIGNED_OK static inline uint64_t
EXTRACT_64BITS(const void *p)
{
- return ((u_int64_t)(((u_int64_t)ntohl(((const unaligned_u_int32_t *)(p) + 0)->val)) << 32 | \
- ((u_int64_t)ntohl(((const unaligned_u_int32_t *)(p) + 1)->val)) << 0));
+ 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));
}
#else /* have to do it a byte at a time */
* 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)))
+ ((uint16_t)(((uint16_t)(*((const uint8_t *)(p) + 0)) << 8) | \
+ ((uint16_t)(*((const uint8_t *)(p) + 1)) << 0)))
#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)))
+ ((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_64BITS(p) \
- ((u_int64_t)((u_int64_t)*((const u_int8_t *)(p) + 0) << 56 | \
- (u_int64_t)*((const u_int8_t *)(p) + 1) << 48 | \
- (u_int64_t)*((const u_int8_t *)(p) + 2) << 40 | \
- (u_int64_t)*((const u_int8_t *)(p) + 3) << 32 | \
- (u_int64_t)*((const u_int8_t *)(p) + 4) << 24 | \
- (u_int64_t)*((const u_int8_t *)(p) + 5) << 16 | \
- (u_int64_t)*((const u_int8_t *)(p) + 6) << 8 | \
- (u_int64_t)*((const u_int8_t *)(p) + 7)))
+ ((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)))
#endif /* must special-case unaligned accesses */
#else /* LBL_ALIGN */
/*
* The processor natively handles unaligned loads, so we can just
* cast the pointer and fetch through it.
*/
-static inline u_int16_t
+static inline uint16_t UNALIGNED_OK
EXTRACT_16BITS(const void *p)
{
- return ((u_int16_t)ntohs(*(const u_int16_t *)(p)));
+ return ((uint16_t)ntohs(*(const uint16_t *)(p)));
}
-static inline u_int32_t
+static inline uint32_t UNALIGNED_OK
EXTRACT_32BITS(const void *p)
{
- return ((u_int32_t)ntohl(*(const u_int32_t *)(p)));
+ return ((uint32_t)ntohl(*(const uint32_t *)(p)));
}
-static inline u_int64_t
+static inline uint64_t UNALIGNED_OK
EXTRACT_64BITS(const void *p)
{
- return ((u_int64_t)(((u_int64_t)ntohl(*((const u_int32_t *)(p) + 0))) << 32 | \
- ((u_int64_t)ntohl(*((const u_int32_t *)(p) + 1))) << 0));
+ return ((uint64_t)(((uint64_t)ntohl(*((const uint32_t *)(p) + 0))) << 32 |
+ ((uint64_t)ntohl(*((const uint32_t *)(p) + 1))) << 0));
}
#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)))
+ ((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_40BITS(p) \
- ((u_int64_t)((u_int64_t)*((const u_int8_t *)(p) + 0) << 32 | \
- (u_int64_t)*((const u_int8_t *)(p) + 1) << 24 | \
- (u_int64_t)*((const u_int8_t *)(p) + 2) << 16 | \
- (u_int64_t)*((const u_int8_t *)(p) + 3) << 8 | \
- (u_int64_t)*((const u_int8_t *)(p) + 4)))
+ ((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_48BITS(p) \
- ((u_int64_t)((u_int64_t)*((const u_int8_t *)(p) + 0) << 40 | \
- (u_int64_t)*((const u_int8_t *)(p) + 1) << 32 | \
- (u_int64_t)*((const u_int8_t *)(p) + 2) << 24 | \
- (u_int64_t)*((const u_int8_t *)(p) + 3) << 16 | \
- (u_int64_t)*((const u_int8_t *)(p) + 4) << 8 | \
- (u_int64_t)*((const u_int8_t *)(p) + 5)))
+ ((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_56BITS(p) \
- ((u_int64_t)((u_int64_t)*((const u_int8_t *)(p) + 0) << 48 | \
- (u_int64_t)*((const u_int8_t *)(p) + 1) << 40 | \
- (u_int64_t)*((const u_int8_t *)(p) + 2) << 32 | \
- (u_int64_t)*((const u_int8_t *)(p) + 3) << 24 | \
- (u_int64_t)*((const u_int8_t *)(p) + 4) << 16 | \
- (u_int64_t)*((const u_int8_t *)(p) + 5) << 8 | \
- (u_int64_t)*((const u_int8_t *)(p) + 6)))
+ ((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)))
/*
* Macros to extract possibly-unaligned little-endian integral values.
*/
#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)))
+ ((uint16_t)(((uint16_t)(*((const uint8_t *)(p) + 1)) << 8) | \
+ ((uint16_t)(*((const uint8_t *)(p) + 0)) << 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)))
+ ((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_24BITS(p) \
- ((u_int32_t)((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)))
+ ((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_64BITS(p) \
- ((u_int64_t)((u_int64_t)*((const u_int8_t *)(p) + 7) << 56 | \
- (u_int64_t)*((const u_int8_t *)(p) + 6) << 48 | \
- (u_int64_t)*((const u_int8_t *)(p) + 5) << 40 | \
- (u_int64_t)*((const u_int8_t *)(p) + 4) << 32 | \
- (u_int64_t)*((const u_int8_t *)(p) + 3) << 24 | \
- (u_int64_t)*((const u_int8_t *)(p) + 2) << 16 | \
- (u_int64_t)*((const u_int8_t *)(p) + 1) << 8 | \
- (u_int64_t)*((const u_int8_t *)(p) + 0)))
+ ((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)))
+
+/*
+ * Macros to check the presence of the values in question.
+ */
+#define ND_TTEST_8BITS(p) ND_TTEST2(*(p), 1)
+#define ND_TCHECK_8BITS(p) ND_TCHECK2(*(p), 1)
+
+#define ND_TTEST_16BITS(p) ND_TTEST2(*(p), 2)
+#define ND_TCHECK_16BITS(p) ND_TCHECK2(*(p), 2)
+
+#define ND_TTEST_24BITS(p) ND_TTEST2(*(p), 3)
+#define ND_TCHECK_24BITS(p) ND_TCHECK2(*(p), 3)
+
+#define ND_TTEST_32BITS(p) ND_TTEST2(*(p), 4)
+#define ND_TCHECK_32BITS(p) ND_TCHECK2(*(p), 4)
+
+#define ND_TTEST_40BITS(p) ND_TTEST2(*(p), 5)
+#define ND_TCHECK_40BITS(p) ND_TCHECK2(*(p), 5)
+
+#define ND_TTEST_48BITS(p) ND_TTEST2(*(p), 6)
+#define ND_TCHECK_48BITS(p) ND_TCHECK2(*(p), 6)
+
+#define ND_TTEST_56BITS(p) ND_TTEST2(*(p), 7)
+#define ND_TCHECK_56BITS(p) ND_TCHECK2(*(p), 7)
+
+#define ND_TTEST_64BITS(p) ND_TTEST2(*(p), 8)
+#define ND_TCHECK_64BITS(p) ND_TCHECK2(*(p), 8)
projects / tcpdump / blobdiff