226 lines
9.2 KiB
C
226 lines
9.2 KiB
C
/*
|
|
* Copyright (c) 1992, 1993, 1994, 1995, 1996
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that: (1) source code distributions
|
|
* retain the above copyright notice and this paragraph in its entirety, (2)
|
|
* distributions including binary code include the above copyright notice and
|
|
* this paragraph in its entirety in the documentation or other materials
|
|
* provided with the distribution, and (3) all advertising materials mentioning
|
|
* features or use of this software display the following acknowledgement:
|
|
* ``This product includes software developed by the University of California,
|
|
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
|
|
* the University nor the names of its contributors may be used to endorse
|
|
* or promote products derived from this software without specific prior
|
|
* written permission.
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef _WIN32
|
|
#include <arpa/inet.h>
|
|
#endif
|
|
|
|
#include <pcap/pcap-inttypes.h>
|
|
#include <pcap/compiler-tests.h>
|
|
|
|
/*
|
|
* Macros to extract possibly-unaligned big-endian integral values.
|
|
*/
|
|
#ifdef LBL_ALIGN
|
|
/*
|
|
* The processor doesn't natively handle unaligned loads.
|
|
*/
|
|
#if PCAP_IS_AT_LEAST_GNUC_VERSION(2,0) && \
|
|
(defined(__alpha) || defined(__alpha__) || \
|
|
defined(__mips) || defined(__mips__))
|
|
/*
|
|
* 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.
|
|
*
|
|
* 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 {
|
|
uint16_t val;
|
|
} __attribute__((packed)) unaligned_uint16_t;
|
|
|
|
typedef struct {
|
|
uint32_t val;
|
|
} __attribute__((packed)) unaligned_uint32_t;
|
|
|
|
static inline uint16_t
|
|
EXTRACT_16BITS(const void *p)
|
|
{
|
|
return ((uint16_t)ntohs(((const unaligned_uint16_t *)(p))->val));
|
|
}
|
|
|
|
static inline uint32_t
|
|
EXTRACT_32BITS(const void *p)
|
|
{
|
|
return ((uint32_t)ntohl(((const unaligned_uint32_t *)(p))->val));
|
|
}
|
|
|
|
static inline uint64_t
|
|
EXTRACT_64BITS(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));
|
|
}
|
|
|
|
#else /* have to do it a byte at a time */
|
|
/*
|
|
* 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.
|
|
*/
|
|
#define EXTRACT_16BITS(p) \
|
|
((uint16_t)(((uint16_t)(*((const uint8_t *)(p) + 0)) << 8) | \
|
|
((uint16_t)(*((const uint8_t *)(p) + 1)) << 0)))
|
|
#define EXTRACT_32BITS(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_64BITS(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)))
|
|
#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 uint16_t
|
|
EXTRACT_16BITS(const void *p)
|
|
{
|
|
return ((uint16_t)ntohs(*(const uint16_t *)(p)));
|
|
}
|
|
|
|
static inline uint32_t
|
|
EXTRACT_32BITS(const void *p)
|
|
{
|
|
return ((uint32_t)ntohl(*(const uint32_t *)(p)));
|
|
}
|
|
|
|
static inline uint64_t
|
|
EXTRACT_64BITS(const void *p)
|
|
{
|
|
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) \
|
|
((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) \
|
|
((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) \
|
|
((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) \
|
|
((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.
|
|
* XXX - do loads on little-endian machines that support unaligned loads?
|
|
*/
|
|
#define EXTRACT_LE_8BITS(p) (*(p))
|
|
#define EXTRACT_LE_16BITS(p) \
|
|
((uint16_t)(((uint16_t)(*((const uint8_t *)(p) + 1)) << 8) | \
|
|
((uint16_t)(*((const uint8_t *)(p) + 0)) << 0)))
|
|
#define EXTRACT_LE_32BITS(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_24BITS(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_64BITS(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)))
|