common.h revision 4b06059785b935dd1f4f09314e4e12c417d2c6a4 
1/*
2 * wpa_supplicant/hostapd / common helper functions, etc.
3 * Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#ifndef COMMON_H
10#define COMMON_H
11
12#include "os.h"
13
14#if defined(__linux__) || defined(__GLIBC__)
15#include <endian.h>
16#include <byteswap.h>
17#endif /* __linux__ */
18
19#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || \
20    defined(__OpenBSD__)
21#include <sys/types.h>
22#include <sys/endian.h>
23#define __BYTE_ORDER	_BYTE_ORDER
24#define	__LITTLE_ENDIAN	_LITTLE_ENDIAN
25#define	__BIG_ENDIAN	_BIG_ENDIAN
26#ifdef __OpenBSD__
27#define bswap_16 swap16
28#define bswap_32 swap32
29#define bswap_64 swap64
30#else /* __OpenBSD__ */
31#define bswap_16 bswap16
32#define bswap_32 bswap32
33#define bswap_64 bswap64
34#endif /* __OpenBSD__ */
35#endif /* defined(__FreeBSD__) || defined(__NetBSD__) ||
36	* defined(__DragonFly__) || defined(__OpenBSD__) */
37
38#ifdef __APPLE__
39#include <sys/types.h>
40#include <machine/endian.h>
41#define __BYTE_ORDER	_BYTE_ORDER
42#define __LITTLE_ENDIAN	_LITTLE_ENDIAN
43#define __BIG_ENDIAN	_BIG_ENDIAN
44static inline unsigned short bswap_16(unsigned short v)
45{
46	return ((v & 0xff) << 8) | (v >> 8);
47}
48
49static inline unsigned int bswap_32(unsigned int v)
50{
51	return ((v & 0xff) << 24) | ((v & 0xff00) << 8) |
52		((v & 0xff0000) >> 8) | (v >> 24);
53}
54#endif /* __APPLE__ */
55
56#ifdef CONFIG_TI_COMPILER
57#define __BIG_ENDIAN 4321
58#define __LITTLE_ENDIAN 1234
59#ifdef __big_endian__
60#define __BYTE_ORDER __BIG_ENDIAN
61#else
62#define __BYTE_ORDER __LITTLE_ENDIAN
63#endif
64#endif /* CONFIG_TI_COMPILER */
65
66#ifdef CONFIG_NATIVE_WINDOWS
67#include <winsock.h>
68
69typedef int socklen_t;
70
71#ifndef MSG_DONTWAIT
72#define MSG_DONTWAIT 0 /* not supported */
73#endif
74
75#endif /* CONFIG_NATIVE_WINDOWS */
76
77#ifdef _MSC_VER
78#define inline __inline
79
80#undef vsnprintf
81#define vsnprintf _vsnprintf
82#undef close
83#define close closesocket
84#endif /* _MSC_VER */
85
86
87/* Define platform specific integer types */
88
89#ifdef _MSC_VER
90typedef UINT64 u64;
91typedef UINT32 u32;
92typedef UINT16 u16;
93typedef UINT8 u8;
94typedef INT64 s64;
95typedef INT32 s32;
96typedef INT16 s16;
97typedef INT8 s8;
98#define WPA_TYPES_DEFINED
99#endif /* _MSC_VER */
100
101#ifdef __vxworks
102typedef unsigned long long u64;
103typedef UINT32 u32;
104typedef UINT16 u16;
105typedef UINT8 u8;
106typedef long long s64;
107typedef INT32 s32;
108typedef INT16 s16;
109typedef INT8 s8;
110#define WPA_TYPES_DEFINED
111#endif /* __vxworks */
112
113#ifdef CONFIG_TI_COMPILER
114#ifdef _LLONG_AVAILABLE
115typedef unsigned long long u64;
116#else
117/*
118 * TODO: 64-bit variable not available. Using long as a workaround to test the
119 * build, but this will likely not work for all operations.
120 */
121typedef unsigned long u64;
122#endif
123typedef unsigned int u32;
124typedef unsigned short u16;
125typedef unsigned char u8;
126#define WPA_TYPES_DEFINED
127#endif /* CONFIG_TI_COMPILER */
128
129#ifndef WPA_TYPES_DEFINED
130#ifdef CONFIG_USE_INTTYPES_H
131#include <inttypes.h>
132#else
133#include <stdint.h>
134#endif
135typedef uint64_t u64;
136typedef uint32_t u32;
137typedef uint16_t u16;
138typedef uint8_t u8;
139typedef int64_t s64;
140typedef int32_t s32;
141typedef int16_t s16;
142typedef int8_t s8;
143#define WPA_TYPES_DEFINED
144#endif /* !WPA_TYPES_DEFINED */
145
146
147/* Define platform specific byte swapping macros */
148
149#if defined(__CYGWIN__) || defined(CONFIG_NATIVE_WINDOWS)
150
151static inline unsigned short wpa_swap_16(unsigned short v)
152{
153	return ((v & 0xff) << 8) | (v >> 8);
154}
155
156static inline unsigned int wpa_swap_32(unsigned int v)
157{
158	return ((v & 0xff) << 24) | ((v & 0xff00) << 8) |
159		((v & 0xff0000) >> 8) | (v >> 24);
160}
161
162#define le_to_host16(n) (n)
163#define host_to_le16(n) (n)
164#define be_to_host16(n) wpa_swap_16(n)
165#define host_to_be16(n) wpa_swap_16(n)
166#define le_to_host32(n) (n)
167#define be_to_host32(n) wpa_swap_32(n)
168#define host_to_be32(n) wpa_swap_32(n)
169
170#define WPA_BYTE_SWAP_DEFINED
171
172#endif /* __CYGWIN__ || CONFIG_NATIVE_WINDOWS */
173
174
175#ifndef WPA_BYTE_SWAP_DEFINED
176
177#ifndef __BYTE_ORDER
178#ifndef __LITTLE_ENDIAN
179#ifndef __BIG_ENDIAN
180#define __LITTLE_ENDIAN 1234
181#define __BIG_ENDIAN 4321
182#if defined(sparc)
183#define __BYTE_ORDER __BIG_ENDIAN
184#endif
185#endif /* __BIG_ENDIAN */
186#endif /* __LITTLE_ENDIAN */
187#endif /* __BYTE_ORDER */
188
189#if __BYTE_ORDER == __LITTLE_ENDIAN
190#define le_to_host16(n) ((__force u16) (le16) (n))
191#define host_to_le16(n) ((__force le16) (u16) (n))
192#define be_to_host16(n) bswap_16((__force u16) (be16) (n))
193#define host_to_be16(n) ((__force be16) bswap_16((n)))
194#define le_to_host32(n) ((__force u32) (le32) (n))
195#define host_to_le32(n) ((__force le32) (u32) (n))
196#define be_to_host32(n) bswap_32((__force u32) (be32) (n))
197#define host_to_be32(n) ((__force be32) bswap_32((n)))
198#define le_to_host64(n) ((__force u64) (le64) (n))
199#define host_to_le64(n) ((__force le64) (u64) (n))
200#define be_to_host64(n) bswap_64((__force u64) (be64) (n))
201#define host_to_be64(n) ((__force be64) bswap_64((n)))
202#elif __BYTE_ORDER == __BIG_ENDIAN
203#define le_to_host16(n) bswap_16(n)
204#define host_to_le16(n) bswap_16(n)
205#define be_to_host16(n) (n)
206#define host_to_be16(n) (n)
207#define le_to_host32(n) bswap_32(n)
208#define be_to_host32(n) (n)
209#define host_to_be32(n) (n)
210#define le_to_host64(n) bswap_64(n)
211#define host_to_le64(n) bswap_64(n)
212#define be_to_host64(n) (n)
213#define host_to_be64(n) (n)
214#ifndef WORDS_BIGENDIAN
215#define WORDS_BIGENDIAN
216#endif
217#else
218#error Could not determine CPU byte order
219#endif
220
221#define WPA_BYTE_SWAP_DEFINED
222#endif /* !WPA_BYTE_SWAP_DEFINED */
223
224
225/* Macros for handling unaligned memory accesses */
226
227static inline u16 WPA_GET_BE16(const u8 *a)
228{
229	return (a[0] << 8) | a[1];
230}
231
232static inline void WPA_PUT_BE16(u8 *a, u16 val)
233{
234	a[0] = val >> 8;
235	a[1] = val & 0xff;
236}
237
238static inline u16 WPA_GET_LE16(const u8 *a)
239{
240	return (a[1] << 8) | a[0];
241}
242
243static inline void WPA_PUT_LE16(u8 *a, u16 val)
244{
245	a[1] = val >> 8;
246	a[0] = val & 0xff;
247}
248
249static inline u32 WPA_GET_BE24(const u8 *a)
250{
251	return (a[0] << 16) | (a[1] << 8) | a[2];
252}
253
254static inline void WPA_PUT_BE24(u8 *a, u32 val)
255{
256	a[0] = (val >> 16) & 0xff;
257	a[1] = (val >> 8) & 0xff;
258	a[2] = val & 0xff;
259}
260
261static inline u32 WPA_GET_BE32(const u8 *a)
262{
263	return (a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3];
264}
265
266static inline void WPA_PUT_BE32(u8 *a, u32 val)
267{
268	a[0] = (val >> 24) & 0xff;
269	a[1] = (val >> 16) & 0xff;
270	a[2] = (val >> 8) & 0xff;
271	a[3] = val & 0xff;
272}
273
274static inline u32 WPA_GET_LE32(const u8 *a)
275{
276	return (a[3] << 24) | (a[2] << 16) | (a[1] << 8) | a[0];
277}
278
279static inline void WPA_PUT_LE32(u8 *a, u32 val)
280{
281	a[3] = (val >> 24) & 0xff;
282	a[2] = (val >> 16) & 0xff;
283	a[1] = (val >> 8) & 0xff;
284	a[0] = val & 0xff;
285}
286
287static inline u64 WPA_GET_BE64(const u8 *a)
288{
289	return (((u64) a[0]) << 56) | (((u64) a[1]) << 48) |
290		(((u64) a[2]) << 40) | (((u64) a[3]) << 32) |
291		(((u64) a[4]) << 24) | (((u64) a[5]) << 16) |
292		(((u64) a[6]) << 8) | ((u64) a[7]);
293}
294
295static inline void WPA_PUT_BE64(u8 *a, u64 val)
296{
297	a[0] = val >> 56;
298	a[1] = val >> 48;
299	a[2] = val >> 40;
300	a[3] = val >> 32;
301	a[4] = val >> 24;
302	a[5] = val >> 16;
303	a[6] = val >> 8;
304	a[7] = val & 0xff;
305}
306
307static inline u64 WPA_GET_LE64(const u8 *a)
308{
309	return (((u64) a[7]) << 56) | (((u64) a[6]) << 48) |
310		(((u64) a[5]) << 40) | (((u64) a[4]) << 32) |
311		(((u64) a[3]) << 24) | (((u64) a[2]) << 16) |
312		(((u64) a[1]) << 8) | ((u64) a[0]);
313}
314
315static inline void WPA_PUT_LE64(u8 *a, u64 val)
316{
317	a[7] = val >> 56;
318	a[6] = val >> 48;
319	a[5] = val >> 40;
320	a[4] = val >> 32;
321	a[3] = val >> 24;
322	a[2] = val >> 16;
323	a[1] = val >> 8;
324	a[0] = val & 0xff;
325}
326
327
328#ifndef ETH_ALEN
329#define ETH_ALEN 6
330#endif
331#ifndef IFNAMSIZ
332#define IFNAMSIZ 16
333#endif
334#ifndef ETH_P_ALL
335#define ETH_P_ALL 0x0003
336#endif
337#ifndef ETH_P_80211_ENCAP
338#define ETH_P_80211_ENCAP 0x890d /* TDLS comes under this category */
339#endif
340#ifndef ETH_P_PAE
341#define ETH_P_PAE 0x888E /* Port Access Entity (IEEE 802.1X) */
342#endif /* ETH_P_PAE */
343#ifndef ETH_P_EAPOL
344#define ETH_P_EAPOL ETH_P_PAE
345#endif /* ETH_P_EAPOL */
346#ifndef ETH_P_RSN_PREAUTH
347#define ETH_P_RSN_PREAUTH 0x88c7
348#endif /* ETH_P_RSN_PREAUTH */
349#ifndef ETH_P_RRB
350#define ETH_P_RRB 0x890D
351#endif /* ETH_P_RRB */
352
353
354#ifdef __GNUC__
355#define PRINTF_FORMAT(a,b) __attribute__ ((format (printf, (a), (b))))
356#define STRUCT_PACKED __attribute__ ((packed))
357#else
358#define PRINTF_FORMAT(a,b)
359#define STRUCT_PACKED
360#endif
361
362
363#ifdef CONFIG_ANSI_C_EXTRA
364
365#if !defined(_MSC_VER) || _MSC_VER < 1400
366/* snprintf - used in number of places; sprintf() is _not_ a good replacement
367 * due to possible buffer overflow; see, e.g.,
368 * http://www.ijs.si/software/snprintf/ for portable implementation of
369 * snprintf. */
370int snprintf(char *str, size_t size, const char *format, ...);
371
372/* vsnprintf - only used for wpa_msg() in wpa_supplicant.c */
373int vsnprintf(char *str, size_t size, const char *format, va_list ap);
374#endif /* !defined(_MSC_VER) || _MSC_VER < 1400 */
375
376/* getopt - only used in main.c */
377int getopt(int argc, char *const argv[], const char *optstring);
378extern char *optarg;
379extern int optind;
380
381#ifndef CONFIG_NO_SOCKLEN_T_TYPEDEF
382#ifndef __socklen_t_defined
383typedef int socklen_t;
384#endif
385#endif
386
387/* inline - define as __inline or just define it to be empty, if needed */
388#ifdef CONFIG_NO_INLINE
389#define inline
390#else
391#define inline __inline
392#endif
393
394#ifndef __func__
395#define __func__ "__func__ not defined"
396#endif
397
398#ifndef bswap_16
399#define bswap_16(a) ((((u16) (a) << 8) & 0xff00) | (((u16) (a) >> 8) & 0xff))
400#endif
401
402#ifndef bswap_32
403#define bswap_32(a) ((((u32) (a) << 24) & 0xff000000) | \
404		     (((u32) (a) << 8) & 0xff0000) | \
405     		     (((u32) (a) >> 8) & 0xff00) | \
406     		     (((u32) (a) >> 24) & 0xff))
407#endif
408
409#ifndef MSG_DONTWAIT
410#define MSG_DONTWAIT 0
411#endif
412
413#ifdef _WIN32_WCE
414void perror(const char *s);
415#endif /* _WIN32_WCE */
416
417#endif /* CONFIG_ANSI_C_EXTRA */
418
419#ifndef MAC2STR
420#define MAC2STR(a) (a)[0], (a)[1], (a)[2], (a)[3], (a)[4], (a)[5]
421#define MACSTR "%02x:%02x:%02x:%02x:%02x:%02x"
422
423/*
424 * Compact form for string representation of MAC address
425 * To be used, e.g., for constructing dbus paths for P2P Devices
426 */
427#define COMPACT_MACSTR "%02x%02x%02x%02x%02x%02x"
428#endif
429
430#ifndef BIT
431#define BIT(x) (1 << (x))
432#endif
433
434/*
435 * Definitions for sparse validation
436 * (http://kernel.org/pub/linux/kernel/people/josh/sparse/)
437 */
438#ifdef __CHECKER__
439#define __force __attribute__((force))
440#define __bitwise __attribute__((bitwise))
441#else
442#define __force
443#define __bitwise
444#endif
445
446typedef u16 __bitwise be16;
447typedef u16 __bitwise le16;
448typedef u32 __bitwise be32;
449typedef u32 __bitwise le32;
450typedef u64 __bitwise be64;
451typedef u64 __bitwise le64;
452
453#ifndef __must_check
454#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
455#define __must_check __attribute__((__warn_unused_result__))
456#else
457#define __must_check
458#endif /* __GNUC__ */
459#endif /* __must_check */
460
461int hwaddr_aton(const char *txt, u8 *addr);
462int hwaddr_compact_aton(const char *txt, u8 *addr);
463int hwaddr_aton2(const char *txt, u8 *addr);
464int hex2byte(const char *hex);
465int hexstr2bin(const char *hex, u8 *buf, size_t len);
466void inc_byte_array(u8 *counter, size_t len);
467void wpa_get_ntp_timestamp(u8 *buf);
468int wpa_snprintf_hex(char *buf, size_t buf_size, const u8 *data, size_t len);
469int wpa_snprintf_hex_uppercase(char *buf, size_t buf_size, const u8 *data,
470			       size_t len);
471
472#ifdef CONFIG_NATIVE_WINDOWS
473void wpa_unicode2ascii_inplace(TCHAR *str);
474TCHAR * wpa_strdup_tchar(const char *str);
475#else /* CONFIG_NATIVE_WINDOWS */
476#define wpa_unicode2ascii_inplace(s) do { } while (0)
477#define wpa_strdup_tchar(s) strdup((s))
478#endif /* CONFIG_NATIVE_WINDOWS */
479
480void printf_encode(char *txt, size_t maxlen, const u8 *data, size_t len);
481size_t printf_decode(u8 *buf, size_t maxlen, const char *str);
482
483const char * wpa_ssid_txt(const u8 *ssid, size_t ssid_len);
484
485char * wpa_config_parse_string(const char *value, size_t *len);
486int is_hex(const u8 *data, size_t len);
487size_t merge_byte_arrays(u8 *res, size_t res_len,
488			 const u8 *src1, size_t src1_len,
489			 const u8 *src2, size_t src2_len);
490char * dup_binstr(const void *src, size_t len);
491
492static inline int is_zero_ether_addr(const u8 *a)
493{
494	return !(a[0] | a[1] | a[2] | a[3] | a[4] | a[5]);
495}
496
497static inline int is_broadcast_ether_addr(const u8 *a)
498{
499	return (a[0] & a[1] & a[2] & a[3] & a[4] & a[5]) == 0xff;
500}
501
502#define broadcast_ether_addr (const u8 *) "\xff\xff\xff\xff\xff\xff"
503
504#include "wpa_debug.h"
505
506
507/*
508 * gcc 4.4 ends up generating strict-aliasing warnings about some very common
509 * networking socket uses that do not really result in a real problem and
510 * cannot be easily avoided with union-based type-punning due to struct
511 * definitions including another struct in system header files. To avoid having
512 * to fully disable strict-aliasing warnings, provide a mechanism to hide the
513 * typecast from aliasing for now. A cleaner solution will hopefully be found
514 * in the future to handle these cases.
515 */
516void * __hide_aliasing_typecast(void *foo);
517#define aliasing_hide_typecast(a,t) (t *) __hide_aliasing_typecast((a))
518
519#ifdef CONFIG_VALGRIND
520#include <valgrind/memcheck.h>
521#define WPA_MEM_DEFINED(ptr, len) VALGRIND_MAKE_MEM_DEFINED((ptr), (len))
522#else /* CONFIG_VALGRIND */
523#define WPA_MEM_DEFINED(ptr, len) do { } while (0)
524#endif /* CONFIG_VALGRIND */
525
526#endif /* COMMON_H */
527