424 lines
18 KiB
C
424 lines
18 KiB
C
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/*
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* Copyright (c) 1992, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef _WIN32
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#include <arpa/inet.h>
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#endif
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#include <pcap/pcap-inttypes.h>
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#include <pcap/compiler-tests.h>
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#include "portability.h"
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/*
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* If we have versions of GCC or Clang that support an __attribute__
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* to say "if we're building with unsigned behavior sanitization,
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* don't complain about undefined behavior in this function", we
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* label these functions with that attribute - we *know* it's undefined
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* in the C standard, but we *also* know it does what we want with
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* the ISA we're targeting and the compiler we're using.
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*
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* For GCC 4.9.0 and later, we use __attribute__((no_sanitize_undefined));
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* pre-5.0 GCC doesn't have __has_attribute, and I'm not sure whether
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* GCC or Clang first had __attribute__((no_sanitize(XXX)).
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*
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* For Clang, we check for __attribute__((no_sanitize(XXX)) with
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* __has_attribute, as there are versions of Clang that support
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* __attribute__((no_sanitize("undefined")) but don't support
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* __attribute__((no_sanitize_undefined)).
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*
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* We define this here, rather than in funcattrs.h, because we
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* only want it used here, we don't want it to be broadly used.
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* (Any printer will get this defined, but this should at least
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* make it harder for people to find.)
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*/
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#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 409)
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#define UNALIGNED_OK __attribute__((no_sanitize_undefined))
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#elif __has_attribute(no_sanitize)
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#define UNALIGNED_OK __attribute__((no_sanitize("undefined")))
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#else
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#define UNALIGNED_OK
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#endif
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#if (defined(__i386__) || defined(_M_IX86) || defined(__X86__) || defined(__x86_64__) || defined(_M_X64)) || \
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(defined(__m68k__) && (!defined(__mc68000__) && !defined(__mc68010__))) || \
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(defined(__ppc__) || defined(__ppc64__) || defined(_M_PPC) || defined(_ARCH_PPC) || defined(_ARCH_PPC64)) || \
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(defined(__s390__) || defined(__s390x__) || defined(__zarch__))
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/*
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* The processor natively handles unaligned loads, so we can just
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* cast the pointer and fetch through it.
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*
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* XXX - are those all the x86 tests we need?
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* XXX - are those the only 68k tests we need not to generated
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* unaligned accesses if the target is the 68000 or 68010?
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* XXX - are there any tests we don't need, because some definitions are for
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* compilers that also predefine the GCC symbols?
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* XXX - do we need to test for both 32-bit and 64-bit versions of those
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* architectures in all cases?
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*/
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UNALIGNED_OK static inline uint16_t
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EXTRACT_BE_U_2(const void *p)
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{
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return ((uint16_t)ntohs(*(const uint16_t *)(p)));
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}
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UNALIGNED_OK static inline int16_t
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EXTRACT_BE_S_2(const void *p)
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{
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return ((int16_t)ntohs(*(const int16_t *)(p)));
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}
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UNALIGNED_OK static inline uint32_t
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EXTRACT_BE_U_4(const void *p)
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{
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return ((uint32_t)ntohl(*(const uint32_t *)(p)));
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}
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UNALIGNED_OK static inline int32_t
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EXTRACT_BE_S_4(const void *p)
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{
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return ((int32_t)ntohl(*(const int32_t *)(p)));
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}
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UNALIGNED_OK static inline uint64_t
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EXTRACT_BE_U_8(const void *p)
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{
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return ((uint64_t)(((uint64_t)ntohl(*((const uint32_t *)(p) + 0))) << 32 |
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((uint64_t)ntohl(*((const uint32_t *)(p) + 1))) << 0));
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}
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UNALIGNED_OK static inline int64_t
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EXTRACT_BE_S_8(const void *p)
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{
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return ((int64_t)(((int64_t)ntohl(*((const uint32_t *)(p) + 0))) << 32 |
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((uint64_t)ntohl(*((const uint32_t *)(p) + 1))) << 0));
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}
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#elif PCAP_IS_AT_LEAST_GNUC_VERSION(2,0) && \
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(defined(__alpha) || defined(__alpha__) || \
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defined(__mips) || defined(__mips__))
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/*
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* This is MIPS or Alpha, which don't natively handle unaligned loads,
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* but which have instructions that can help when doing unaligned
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* loads, and this is GCC 2.0 or later or a compiler that claims to
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* be GCC 2.0 or later, which we assume that mean we have
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* __attribute__((packed)), which we can use to convince the compiler
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* to generate those instructions.
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*
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* Declare packed structures containing a uint16_t and a uint32_t,
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* cast the pointer to point to one of those, and fetch through it;
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* the GCC manual doesn't appear to explicitly say that
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* __attribute__((packed)) causes the compiler to generate unaligned-safe
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* code, but it apppears to do so.
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*
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* We do this in case the compiler can generate code using those
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* instructions to do an unaligned load and pass stuff to "ntohs()" or
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* "ntohl()", which might be better than the code to fetch the
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* bytes one at a time and assemble them. (That might not be the
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* case on a little-endian platform, such as DEC's MIPS machines and
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* Alpha machines, where "ntohs()" and "ntohl()" might not be done
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* inline.)
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*
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* We do this only for specific architectures because, for example,
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* at least some versions of GCC, when compiling for 64-bit SPARC,
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* generate code that assumes alignment if we do this.
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*
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* XXX - add other architectures and compilers as possible and
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* appropriate.
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*
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* HP's C compiler, indicated by __HP_cc being defined, supports
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* "#pragma unaligned N" in version A.05.50 and later, where "N"
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* specifies a number of bytes at which the typedef on the next
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* line is aligned, e.g.
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*
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* #pragma unalign 1
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* typedef uint16_t unaligned_uint16_t;
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*
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* to define unaligned_uint16_t as a 16-bit unaligned data type.
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* This could be presumably used, in sufficiently recent versions of
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* the compiler, with macros similar to those below. This would be
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* useful only if that compiler could generate better code for PA-RISC
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* or Itanium than would be generated by a bunch of shifts-and-ORs.
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*
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* DEC C, indicated by __DECC being defined, has, at least on Alpha,
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* an __unaligned qualifier that can be applied to pointers to get the
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* compiler to generate code that does unaligned loads and stores when
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* dereferencing the pointer in question.
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*
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* XXX - what if the native C compiler doesn't support
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* __attribute__((packed))? How can we get it to generate unaligned
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* accesses for *specific* items?
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*/
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typedef struct {
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uint16_t val;
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} __attribute__((packed)) unaligned_uint16_t;
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typedef struct {
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int16_t val;
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} __attribute__((packed)) unaligned_int16_t;
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typedef struct {
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uint32_t val;
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} __attribute__((packed)) unaligned_uint32_t;
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typedef struct {
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int32_t val;
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} __attribute__((packed)) unaligned_int32_t;
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UNALIGNED_OK static inline uint16_t
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EXTRACT_BE_U_2(const void *p)
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{
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return ((uint16_t)ntohs(((const unaligned_uint16_t *)(p))->val));
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}
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UNALIGNED_OK static inline int16_t
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EXTRACT_BE_S_2(const void *p)
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{
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return ((int16_t)ntohs(((const unaligned_int16_t *)(p))->val));
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}
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UNALIGNED_OK static inline uint32_t
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EXTRACT_BE_U_4(const void *p)
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{
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return ((uint32_t)ntohl(((const unaligned_uint32_t *)(p))->val));
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}
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UNALIGNED_OK static inline int32_t
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EXTRACT_BE_S_4(const void *p)
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{
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return ((int32_t)ntohl(((const unaligned_int32_t *)(p))->val));
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}
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UNALIGNED_OK static inline uint64_t
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EXTRACT_BE_U_8(const void *p)
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{
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return ((uint64_t)(((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 0)->val)) << 32 |
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((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 1)->val)) << 0));
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}
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UNALIGNED_OK static inline int64_t
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EXTRACT_BE_S_8(const void *p)
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{
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return ((int64_t)(((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 0)->val)) << 32 |
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((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 1)->val)) << 0));
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}
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#else
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/*
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* This architecture doesn't natively support unaligned loads, and either
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* this isn't a GCC-compatible compiler, we don't have __attribute__,
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* or we do but we don't know of any better way with this instruction
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* set to do unaligned loads, so do unaligned loads of big-endian
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* quantities the hard way - fetch the bytes one at a time and
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* assemble them.
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*
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* XXX - ARM is a special case. ARMv1 through ARMv5 didn't suppory
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* unaligned loads; ARMv6 and later support it *but* have a bit in
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* the system control register that the OS can set and that causes
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* unaligned loads to fault rather than succeeding.
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*
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* At least some OSes may set that flag, so we do *not* treat ARM
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* as supporting unaligned loads. If your OS supports them on ARM,
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* and you want to use them, please update the tests in the #if above
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* to check for ARM *and* for your OS.
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*/
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#define EXTRACT_BE_U_2(p) \
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((uint16_t)(((uint16_t)(*((const uint8_t *)(p) + 0)) << 8) | \
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((uint16_t)(*((const uint8_t *)(p) + 1)) << 0)))
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#define EXTRACT_BE_S_2(p) \
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((int16_t)(((uint16_t)(*((const uint8_t *)(p) + 0)) << 8) | \
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((uint16_t)(*((const uint8_t *)(p) + 1)) << 0)))
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#define EXTRACT_BE_U_4(p) \
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((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 24) | \
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((uint32_t)(*((const uint8_t *)(p) + 1)) << 16) | \
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((uint32_t)(*((const uint8_t *)(p) + 2)) << 8) | \
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((uint32_t)(*((const uint8_t *)(p) + 3)) << 0)))
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#define EXTRACT_BE_S_4(p) \
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((int32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 24) | \
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((uint32_t)(*((const uint8_t *)(p) + 1)) << 16) | \
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((uint32_t)(*((const uint8_t *)(p) + 2)) << 8) | \
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((uint32_t)(*((const uint8_t *)(p) + 3)) << 0)))
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#define EXTRACT_BE_U_8(p) \
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((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 56) | \
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((uint64_t)(*((const uint8_t *)(p) + 1)) << 48) | \
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((uint64_t)(*((const uint8_t *)(p) + 2)) << 40) | \
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((uint64_t)(*((const uint8_t *)(p) + 3)) << 32) | \
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((uint64_t)(*((const uint8_t *)(p) + 4)) << 24) | \
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((uint64_t)(*((const uint8_t *)(p) + 5)) << 16) | \
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((uint64_t)(*((const uint8_t *)(p) + 6)) << 8) | \
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((uint64_t)(*((const uint8_t *)(p) + 7)) << 0)))
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#define EXTRACT_BE_S_8(p) \
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((int64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 56) | \
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((uint64_t)(*((const uint8_t *)(p) + 1)) << 48) | \
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((uint64_t)(*((const uint8_t *)(p) + 2)) << 40) | \
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((uint64_t)(*((const uint8_t *)(p) + 3)) << 32) | \
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((uint64_t)(*((const uint8_t *)(p) + 4)) << 24) | \
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((uint64_t)(*((const uint8_t *)(p) + 5)) << 16) | \
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((uint64_t)(*((const uint8_t *)(p) + 6)) << 8) | \
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((uint64_t)(*((const uint8_t *)(p) + 7)) << 0)))
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/*
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* Extract an IPv4 address, which is in network byte order, and not
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* necessarily aligned, and provide the result in host byte order.
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*/
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#define EXTRACT_IPV4_TO_HOST_ORDER(p) \
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((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 24) | \
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((uint32_t)(*((const uint8_t *)(p) + 1)) << 16) | \
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((uint32_t)(*((const uint8_t *)(p) + 2)) << 8) | \
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((uint32_t)(*((const uint8_t *)(p) + 3)) << 0)))
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#endif /* unaligned access checks */
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/*
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* Non-power-of-2 sizes.
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*/
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#define EXTRACT_BE_U_3(p) \
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((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 16) | \
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((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
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((uint32_t)(*((const uint8_t *)(p) + 2)) << 0)))
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#define EXTRACT_BE_S_3(p) \
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(((*((const uint8_t *)(p) + 0)) & 0x80) ? \
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((int32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 16) | \
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((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
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((uint32_t)(*((const uint8_t *)(p) + 2)) << 0))) : \
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((int32_t)(0xFF000000U | \
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((uint32_t)(*((const uint8_t *)(p) + 0)) << 16) | \
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((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
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((uint32_t)(*((const uint8_t *)(p) + 2)) << 0))))
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#define EXTRACT_BE_U_5(p) \
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((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 32) | \
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((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) ? \
|
||
|
|
((int64_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_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)))
|