[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / ceph / decode.h

#ifndef __CEPH_DECODE_H
#define __CEPH_DECODE_H

#include <linux/err.h>
#include <linux/bug.h>
#include <linux/time.h>
#include <asm/unaligned.h>

#include <linux/ceph/types.h>

/* This seemed to be the easiest place to define these */

#define	U8_MAX	((u8)(~0U))
#define	U16_MAX	((u16)(~0U))
#define	U32_MAX	((u32)(~0U))
#define	U64_MAX	((u64)(~0ULL))

#define	S8_MAX	((s8)(U8_MAX >> 1))
#define	S16_MAX	((s16)(U16_MAX >> 1))
#define	S32_MAX	((s32)(U32_MAX >> 1))
#define	S64_MAX	((s64)(U64_MAX >> 1LL))

#define	S8_MIN	((s8)(-S8_MAX - 1))
#define	S16_MIN	((s16)(-S16_MAX - 1))
#define	S32_MIN	((s32)(-S32_MAX - 1))
#define	S64_MIN	((s64)(-S64_MAX - 1LL))

/*
 * in all cases,
 *   void **p     pointer to position pointer
 *   void *end    pointer to end of buffer (last byte + 1)
 */

static inline u64 ceph_decode_64(void **p)
{
	u64 v = get_unaligned_le64(*p);
	*p += sizeof(u64);
	return v;
}
static inline u32 ceph_decode_32(void **p)
{
	u32 v = get_unaligned_le32(*p);
	*p += sizeof(u32);
	return v;
}
static inline u16 ceph_decode_16(void **p)
{
	u16 v = get_unaligned_le16(*p);
	*p += sizeof(u16);
	return v;
}
static inline u8 ceph_decode_8(void **p)
{
	u8 v = *(u8 *)*p;
	(*p)++;
	return v;
}
static inline void ceph_decode_copy(void **p, void *pv, size_t n)
{
	memcpy(pv, *p, n);
	*p += n;
}

/*
 * bounds check input.
 */
static inline int ceph_has_room(void **p, void *end, size_t n)
{
	return end >= *p && n <= end - *p;
}

#define ceph_decode_need(p, end, n, bad)			\
	do {							\
		if (!likely(ceph_has_room(p, end, n)))		\
			goto bad;				\
	} while (0)

#define ceph_decode_64_safe(p, end, v, bad)			\
	do {							\
		ceph_decode_need(p, end, sizeof(u64), bad);	\
		v = ceph_decode_64(p);				\
	} while (0)
#define ceph_decode_32_safe(p, end, v, bad)			\
	do {							\
		ceph_decode_need(p, end, sizeof(u32), bad);	\
		v = ceph_decode_32(p);				\
	} while (0)
#define ceph_decode_16_safe(p, end, v, bad)			\
	do {							\
		ceph_decode_need(p, end, sizeof(u16), bad);	\
		v = ceph_decode_16(p);				\
	} while (0)
#define ceph_decode_8_safe(p, end, v, bad)			\
	do {							\
		ceph_decode_need(p, end, sizeof(u8), bad);	\
		v = ceph_decode_8(p);				\
	} while (0)

#define ceph_decode_copy_safe(p, end, pv, n, bad)		\
	do {							\
		ceph_decode_need(p, end, n, bad);		\
		ceph_decode_copy(p, pv, n);			\
	} while (0)

/*
 * Allocate a buffer big enough to hold the wire-encoded string, and
 * decode the string into it.  The resulting string will always be
 * terminated with '\0'.  If successful, *p will be advanced
 * past the decoded data.  Also, if lenp is not a null pointer, the
 * length (not including the terminating '\0') will be recorded in
 * *lenp.  Note that a zero-length string is a valid return value.
 *
 * Returns a pointer to the newly-allocated string buffer, or a
 * pointer-coded errno if an error occurs.  Neither *p nor *lenp
 * will have been updated if an error is returned.
 *
 * There are two possible failures:
 *   - converting the string would require accessing memory at or
 *     beyond the "end" pointer provided (-ERANGE)
 *   - memory could not be allocated for the result (-ENOMEM)
 */
static inline char *ceph_extract_encoded_string(void **p, void *end,
						size_t *lenp, gfp_t gfp)
{
	u32 len;
	void *sp = *p;
	char *buf;

	ceph_decode_32_safe(&sp, end, len, bad);
	if (!ceph_has_room(&sp, end, len))
		goto bad;

	buf = kmalloc(len + 1, gfp);
	if (!buf)
		return ERR_PTR(-ENOMEM);

	if (len)
		memcpy(buf, sp, len);
	buf[len] = '\0';

	*p = (char *) *p + sizeof (u32) + len;
	if (lenp)
		*lenp = (size_t) len;

	return buf;

bad:
	return ERR_PTR(-ERANGE);
}

/*
 * struct ceph_timespec <-> struct timespec
 */
static inline void ceph_decode_timespec(struct timespec *ts,
					const struct ceph_timespec *tv)
{
	ts->tv_sec = (__kernel_time_t)le32_to_cpu(tv->tv_sec);
	ts->tv_nsec = (long)le32_to_cpu(tv->tv_nsec);
}
static inline void ceph_encode_timespec(struct ceph_timespec *tv,
					const struct timespec *ts)
{
	tv->tv_sec = cpu_to_le32((u32)ts->tv_sec);
	tv->tv_nsec = cpu_to_le32((u32)ts->tv_nsec);
}

/*
 * sockaddr_storage <-> ceph_sockaddr
 */
static inline void ceph_encode_addr(struct ceph_entity_addr *a)
{
	__be16 ss_family = htons(a->in_addr.ss_family);
	a->in_addr.ss_family = *(__u16 *)&ss_family;
}
static inline void ceph_decode_addr(struct ceph_entity_addr *a)
{
	__be16 ss_family = *(__be16 *)&a->in_addr.ss_family;
	a->in_addr.ss_family = ntohs(ss_family);
	WARN_ON(a->in_addr.ss_family == 512);
}

/*
 * encoders
 */
static inline void ceph_encode_64(void **p, u64 v)
{
	put_unaligned_le64(v, (__le64 *)*p);
	*p += sizeof(u64);
}
static inline void ceph_encode_32(void **p, u32 v)
{
	put_unaligned_le32(v, (__le32 *)*p);
	*p += sizeof(u32);
}
static inline void ceph_encode_16(void **p, u16 v)
{
	put_unaligned_le16(v, (__le16 *)*p);
	*p += sizeof(u16);
}
static inline void ceph_encode_8(void **p, u8 v)
{
	*(u8 *)*p = v;
	(*p)++;
}
static inline void ceph_encode_copy(void **p, const void *s, int len)
{
	memcpy(*p, s, len);
	*p += len;
}

/*
 * filepath, string encoders
 */
static inline void ceph_encode_filepath(void **p, void *end,
					u64 ino, const char *path)
{
	u32 len = path ? strlen(path) : 0;
	BUG_ON(*p + 1 + sizeof(ino) + sizeof(len) + len > end);
	ceph_encode_8(p, 1);
	ceph_encode_64(p, ino);
	ceph_encode_32(p, len);
	if (len)
		memcpy(*p, path, len);
	*p += len;
}

static inline void ceph_encode_string(void **p, void *end,
				      const char *s, u32 len)
{
	BUG_ON(*p + sizeof(len) + len > end);
	ceph_encode_32(p, len);
	if (len)
		memcpy(*p, s, len);
	*p += len;
}

#define ceph_encode_need(p, end, n, bad)			\
	do {							\
		if (!likely(ceph_has_room(p, end, n)))		\
			goto bad;				\
	} while (0)

#define ceph_encode_64_safe(p, end, v, bad)			\
	do {							\
		ceph_encode_need(p, end, sizeof(u64), bad);	\
		ceph_encode_64(p, v);				\
	} while (0)
#define ceph_encode_32_safe(p, end, v, bad)			\
	do {							\
		ceph_encode_need(p, end, sizeof(u32), bad);	\
		ceph_encode_32(p, v);				\
	} while (0)
#define ceph_encode_16_safe(p, end, v, bad)			\
	do {							\
		ceph_encode_need(p, end, sizeof(u16), bad);	\
		ceph_encode_16(p, v);				\
	} while (0)
#define ceph_encode_8_safe(p, end, v, bad)			\
	do {							\
		ceph_encode_need(p, end, sizeof(u8), bad);	\
		ceph_encode_8(p, v);				\
	} while (0)

#define ceph_encode_copy_safe(p, end, pv, n, bad)		\
	do {							\
		ceph_encode_need(p, end, n, bad);		\
		ceph_encode_copy(p, pv, n);			\
	} while (0)
#define ceph_encode_string_safe(p, end, s, n, bad)		\
	do {							\
		ceph_encode_need(p, end, n, bad);		\
		ceph_encode_string(p, end, s, n);		\
	} while (0)


#endif
Commit	Line	Data
31b8006e SW	1	#ifndef __CEPH_DECODE_H
	2	#define __CEPH_DECODE_H
	3
f8c36c58	4	#include <linux/err.h>
187f1882	5	#include <linux/bug.h>
c7e337d6	6	#include <linux/time.h>
187f1882	7	#include <asm/unaligned.h>
31b8006e	8
a1ce3928	9	#include <linux/ceph/types.h>
c89136ea	10
adfe695a AE	11	/* This seemed to be the easiest place to define these */
adfe695a AE	12
b587398a AE	13	#define U8_MAX ((u8)(~0U))
	14	#define U16_MAX ((u16)(~0U))
	15	#define U32_MAX ((u32)(~0U))
	16	#define U64_MAX ((u64)(~0ULL))
	17
	18	#define S8_MAX ((s8)(U8_MAX >> 1))
	19	#define S16_MAX ((s16)(U16_MAX >> 1))
	20	#define S32_MAX ((s32)(U32_MAX >> 1))
	21	#define S64_MAX ((s64)(U64_MAX >> 1LL))
	22
	23	#define S8_MIN ((s8)(-S8_MAX - 1))
	24	#define S16_MIN ((s16)(-S16_MAX - 1))
	25	#define S32_MIN ((s32)(-S32_MAX - 1))
	26	#define S64_MIN ((s64)(-S64_MAX - 1LL))
adfe695a	27
31b8006e SW	28	/*
	29	* in all cases,
	30	* void **p pointer to position pointer
	31	* void *end pointer to end of buffer (last byte + 1)
	32	*/
	33
c89136ea SW	34	static inline u64 ceph_decode_64(void **p)
	35	{
	36	u64 v = get_unaligned_le64(*p);
	37	*p += sizeof(u64);
	38	return v;
	39	}
	40	static inline u32 ceph_decode_32(void **p)
	41	{
	42	u32 v = get_unaligned_le32(*p);
	43	*p += sizeof(u32);
	44	return v;
	45	}
	46	static inline u16 ceph_decode_16(void **p)
	47	{
	48	u16 v = get_unaligned_le16(*p);
	49	*p += sizeof(u16);
	50	return v;
	51	}
	52	static inline u8 ceph_decode_8(void **p)
	53	{
	54	u8 v = (u8 )*p;
	55	(*p)++;
	56	return v;
	57	}
	58	static inline void ceph_decode_copy(void *p, void pv, size_t n)
	59	{
	60	memcpy(pv, *p, n);
	61	*p += n;
	62	}
	63
31b8006e SW	64	/*
	65	* bounds check input.
	66	*/
76aa542f XW	67	static inline int ceph_has_room(void *p, void end, size_t n)
	68	{
	69	return end >= p && n <= end - p;
	70	}
	71
dd5f049d AE	72	#define ceph_decode_need(p, end, n, bad) \
	73	do { \
	74	if (!likely(ceph_has_room(p, end, n))) \
	75	goto bad; \
31b8006e SW	76	} while (0)
31b8006e SW	77
31b8006e SW	78	#define ceph_decode_64_safe(p, end, v, bad) \
	79	do { \
	80	ceph_decode_need(p, end, sizeof(u64), bad); \
c89136ea	81	v = ceph_decode_64(p); \
31b8006e SW	82	} while (0)
	83	#define ceph_decode_32_safe(p, end, v, bad) \
	84	do { \
	85	ceph_decode_need(p, end, sizeof(u32), bad); \
c89136ea	86	v = ceph_decode_32(p); \
31b8006e SW	87	} while (0)
	88	#define ceph_decode_16_safe(p, end, v, bad) \
	89	do { \
	90	ceph_decode_need(p, end, sizeof(u16), bad); \
c89136ea	91	v = ceph_decode_16(p); \
31b8006e	92	} while (0)
c7e337d6 SW	93	#define ceph_decode_8_safe(p, end, v, bad) \
	94	do { \
	95	ceph_decode_need(p, end, sizeof(u8), bad); \
	96	v = ceph_decode_8(p); \
	97	} while (0)
31b8006e SW	98
	99	#define ceph_decode_copy_safe(p, end, pv, n, bad) \
	100	do { \
	101	ceph_decode_need(p, end, n, bad); \
	102	ceph_decode_copy(p, pv, n); \
	103	} while (0)
	104
f8c36c58 AE	105	/*
	106	* Allocate a buffer big enough to hold the wire-encoded string, and
	107	* decode the string into it. The resulting string will always be
	108	* terminated with '\0'. If successful, *p will be advanced
	109	* past the decoded data. Also, if lenp is not a null pointer, the
	110	* length (not including the terminating '\0') will be recorded in
	111	* *lenp. Note that a zero-length string is a valid return value.
	112	*
	113	* Returns a pointer to the newly-allocated string buffer, or a
	114	* pointer-coded errno if an error occurs. Neither p nor lenp
	115	* will have been updated if an error is returned.
	116	*
	117	* There are two possible failures:
	118	* - converting the string would require accessing memory at or
dd5f049d AE	119	* beyond the "end" pointer provided (-ERANGE)
dd5f049d AE	120	* - memory could not be allocated for the result (-ENOMEM)
f8c36c58 AE	121	*/
	122	static inline char ceph_extract_encoded_string(void p, void end,
	123	size_t *lenp, gfp_t gfp)
	124	{
	125	u32 len;
	126	void sp = p;
	127	char *buf;
	128
	129	ceph_decode_32_safe(&sp, end, len, bad);
	130	if (!ceph_has_room(&sp, end, len))
	131	goto bad;
	132
	133	buf = kmalloc(len + 1, gfp);
	134	if (!buf)
	135	return ERR_PTR(-ENOMEM);
	136
	137	if (len)
	138	memcpy(buf, sp, len);
	139	buf[len] = '\0';
	140
	141	p = (char ) *p + sizeof (u32) + len;
	142	if (lenp)
	143	*lenp = (size_t) len;
	144
	145	return buf;
	146
	147	bad:
	148	return ERR_PTR(-ERANGE);
	149	}
	150
31b8006e SW	151	/*
	152	* struct ceph_timespec <-> struct timespec
	153	*/
c89136ea	154	static inline void ceph_decode_timespec(struct timespec *ts,
63f2d211	155	const struct ceph_timespec *tv)
c89136ea	156	{
c3f56102 AE	157	ts->tv_sec = (__kernel_time_t)le32_to_cpu(tv->tv_sec);
c3f56102 AE	158	ts->tv_nsec = (long)le32_to_cpu(tv->tv_nsec);
c89136ea SW	159	}
c89136ea SW	160	static inline void ceph_encode_timespec(struct ceph_timespec *tv,
63f2d211	161	const struct timespec *ts)
c89136ea	162	{
c3f56102 AE	163	tv->tv_sec = cpu_to_le32((u32)ts->tv_sec);
c3f56102 AE	164	tv->tv_nsec = cpu_to_le32((u32)ts->tv_nsec);
c89136ea	165	}
31b8006e	166
63f2d211 SW	167	/*
	168	* sockaddr_storage <-> ceph_sockaddr
	169	*/
	170	static inline void ceph_encode_addr(struct ceph_entity_addr *a)
	171	{
cd84db6e YS	172	__be16 ss_family = htons(a->in_addr.ss_family);
cd84db6e YS	173	a->in_addr.ss_family = (__u16 )&ss_family;
63f2d211 SW	174	}
	175	static inline void ceph_decode_addr(struct ceph_entity_addr *a)
	176	{
cd84db6e YS	177	__be16 ss_family = (__be16 )&a->in_addr.ss_family;
cd84db6e YS	178	a->in_addr.ss_family = ntohs(ss_family);
4e7a5dcd	179	WARN_ON(a->in_addr.ss_family == 512);
63f2d211 SW	180	}
63f2d211 SW	181
31b8006e SW	182	/*
	183	* encoders
	184	*/
c89136ea SW	185	static inline void ceph_encode_64(void **p, u64 v)
	186	{
	187	put_unaligned_le64(v, (__le64 )p);
	188	*p += sizeof(u64);
	189	}
	190	static inline void ceph_encode_32(void **p, u32 v)
	191	{
	192	put_unaligned_le32(v, (__le32 )p);
	193	*p += sizeof(u32);
	194	}
	195	static inline void ceph_encode_16(void **p, u16 v)
	196	{
	197	put_unaligned_le16(v, (__le16 )p);
	198	*p += sizeof(u16);
	199	}
	200	static inline void ceph_encode_8(void **p, u8 v)
	201	{
	202	(u8 )*p = v;
	203	(*p)++;
	204	}
4e7a5dcd SW	205	static inline void ceph_encode_copy(void *p, const void s, int len)
	206	{
	207	memcpy(*p, s, len);
	208	*p += len;
	209	}
31b8006e SW	210
	211	/*
	212	* filepath, string encoders
	213	*/
	214	static inline void ceph_encode_filepath(void *p, void end,
	215	u64 ino, const char *path)
	216	{
	217	u32 len = path ? strlen(path) : 0;
c61a1abd	218	BUG_ON(*p + 1 + sizeof(ino) + sizeof(len) + len > end);
ac8839d7	219	ceph_encode_8(p, 1);
31b8006e SW	220	ceph_encode_64(p, ino);
	221	ceph_encode_32(p, len);
	222	if (len)
	223	memcpy(*p, path, len);
	224	*p += len;
	225	}
	226
	227	static inline void ceph_encode_string(void *p, void end,
	228	const char *s, u32 len)
	229	{
	230	BUG_ON(*p + sizeof(len) + len > end);
	231	ceph_encode_32(p, len);
	232	if (len)
	233	memcpy(*p, s, len);
	234	*p += len;
	235	}
	236
dd5f049d AE	237	#define ceph_encode_need(p, end, n, bad) \
	238	do { \
	239	if (!likely(ceph_has_room(p, end, n))) \
	240	goto bad; \
c7e337d6 SW	241	} while (0)
	242
	243	#define ceph_encode_64_safe(p, end, v, bad) \
	244	do { \
	245	ceph_encode_need(p, end, sizeof(u64), bad); \
	246	ceph_encode_64(p, v); \
	247	} while (0)
	248	#define ceph_encode_32_safe(p, end, v, bad) \
	249	do { \
	250	ceph_encode_need(p, end, sizeof(u32), bad); \
dd5f049d	251	ceph_encode_32(p, v); \
c7e337d6 SW	252	} while (0)
	253	#define ceph_encode_16_safe(p, end, v, bad) \
	254	do { \
	255	ceph_encode_need(p, end, sizeof(u16), bad); \
dd5f049d AE	256	ceph_encode_16(p, v); \
	257	} while (0)
	258	#define ceph_encode_8_safe(p, end, v, bad) \
	259	do { \
	260	ceph_encode_need(p, end, sizeof(u8), bad); \
	261	ceph_encode_8(p, v); \
c7e337d6 SW	262	} while (0)
	263
	264	#define ceph_encode_copy_safe(p, end, pv, n, bad) \
	265	do { \
	266	ceph_encode_need(p, end, n, bad); \
	267	ceph_encode_copy(p, pv, n); \
	268	} while (0)
ae1533b6 YS	269	#define ceph_encode_string_safe(p, end, s, n, bad) \
	270	do { \
	271	ceph_encode_need(p, end, n, bad); \
	272	ceph_encode_string(p, end, s, n); \
	273	} while (0)
c7e337d6	274
31b8006e SW	275
31b8006e SW	276	#endif