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Sage Weil31b80062009-10-06 11:31:13 -07001#ifndef __CEPH_DECODE_H
2#define __CEPH_DECODE_H
3
4#include <asm/unaligned.h>
Sage Weilc7e337d2010-02-02 16:11:19 -08005#include <linux/time.h>
Sage Weil31b80062009-10-06 11:31:13 -07006
Sage Weilc89136e2009-10-14 09:59:09 -07007#include "types.h"
8
Sage Weil31b80062009-10-06 11:31:13 -07009/*
10 * in all cases,
11 * void **p pointer to position pointer
12 * void *end pointer to end of buffer (last byte + 1)
13 */
14
Sage Weilc89136e2009-10-14 09:59:09 -070015static inline u64 ceph_decode_64(void **p)
16{
17 u64 v = get_unaligned_le64(*p);
18 *p += sizeof(u64);
19 return v;
20}
21static inline u32 ceph_decode_32(void **p)
22{
23 u32 v = get_unaligned_le32(*p);
24 *p += sizeof(u32);
25 return v;
26}
27static inline u16 ceph_decode_16(void **p)
28{
29 u16 v = get_unaligned_le16(*p);
30 *p += sizeof(u16);
31 return v;
32}
33static inline u8 ceph_decode_8(void **p)
34{
35 u8 v = *(u8 *)*p;
36 (*p)++;
37 return v;
38}
39static inline void ceph_decode_copy(void **p, void *pv, size_t n)
40{
41 memcpy(pv, *p, n);
42 *p += n;
43}
44
Sage Weil31b80062009-10-06 11:31:13 -070045/*
46 * bounds check input.
47 */
48#define ceph_decode_need(p, end, n, bad) \
49 do { \
50 if (unlikely(*(p) + (n) > (end))) \
51 goto bad; \
52 } while (0)
53
Sage Weil31b80062009-10-06 11:31:13 -070054#define ceph_decode_64_safe(p, end, v, bad) \
55 do { \
56 ceph_decode_need(p, end, sizeof(u64), bad); \
Sage Weilc89136e2009-10-14 09:59:09 -070057 v = ceph_decode_64(p); \
Sage Weil31b80062009-10-06 11:31:13 -070058 } while (0)
59#define ceph_decode_32_safe(p, end, v, bad) \
60 do { \
61 ceph_decode_need(p, end, sizeof(u32), bad); \
Sage Weilc89136e2009-10-14 09:59:09 -070062 v = ceph_decode_32(p); \
Sage Weil31b80062009-10-06 11:31:13 -070063 } while (0)
64#define ceph_decode_16_safe(p, end, v, bad) \
65 do { \
66 ceph_decode_need(p, end, sizeof(u16), bad); \
Sage Weilc89136e2009-10-14 09:59:09 -070067 v = ceph_decode_16(p); \
Sage Weil31b80062009-10-06 11:31:13 -070068 } while (0)
Sage Weilc7e337d2010-02-02 16:11:19 -080069#define ceph_decode_8_safe(p, end, v, bad) \
70 do { \
71 ceph_decode_need(p, end, sizeof(u8), bad); \
72 v = ceph_decode_8(p); \
73 } while (0)
Sage Weil31b80062009-10-06 11:31:13 -070074
75#define ceph_decode_copy_safe(p, end, pv, n, bad) \
76 do { \
77 ceph_decode_need(p, end, n, bad); \
78 ceph_decode_copy(p, pv, n); \
79 } while (0)
80
81/*
82 * struct ceph_timespec <-> struct timespec
83 */
Sage Weilc89136e2009-10-14 09:59:09 -070084static inline void ceph_decode_timespec(struct timespec *ts,
Sage Weil63f2d212009-11-03 15:17:56 -080085 const struct ceph_timespec *tv)
Sage Weilc89136e2009-10-14 09:59:09 -070086{
87 ts->tv_sec = le32_to_cpu(tv->tv_sec);
88 ts->tv_nsec = le32_to_cpu(tv->tv_nsec);
89}
90static inline void ceph_encode_timespec(struct ceph_timespec *tv,
Sage Weil63f2d212009-11-03 15:17:56 -080091 const struct timespec *ts)
Sage Weilc89136e2009-10-14 09:59:09 -070092{
93 tv->tv_sec = cpu_to_le32(ts->tv_sec);
94 tv->tv_nsec = cpu_to_le32(ts->tv_nsec);
95}
Sage Weil31b80062009-10-06 11:31:13 -070096
97/*
Sage Weil63f2d212009-11-03 15:17:56 -080098 * sockaddr_storage <-> ceph_sockaddr
99 */
100static inline void ceph_encode_addr(struct ceph_entity_addr *a)
101{
Yehuda Sadehcd84db62010-06-11 16:58:48 -0700102 __be16 ss_family = htons(a->in_addr.ss_family);
103 a->in_addr.ss_family = *(__u16 *)&ss_family;
Sage Weil63f2d212009-11-03 15:17:56 -0800104}
105static inline void ceph_decode_addr(struct ceph_entity_addr *a)
106{
Yehuda Sadehcd84db62010-06-11 16:58:48 -0700107 __be16 ss_family = *(__be16 *)&a->in_addr.ss_family;
108 a->in_addr.ss_family = ntohs(ss_family);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800109 WARN_ON(a->in_addr.ss_family == 512);
Sage Weil63f2d212009-11-03 15:17:56 -0800110}
111
112/*
Sage Weil31b80062009-10-06 11:31:13 -0700113 * encoders
114 */
Sage Weilc89136e2009-10-14 09:59:09 -0700115static inline void ceph_encode_64(void **p, u64 v)
116{
117 put_unaligned_le64(v, (__le64 *)*p);
118 *p += sizeof(u64);
119}
120static inline void ceph_encode_32(void **p, u32 v)
121{
122 put_unaligned_le32(v, (__le32 *)*p);
123 *p += sizeof(u32);
124}
125static inline void ceph_encode_16(void **p, u16 v)
126{
127 put_unaligned_le16(v, (__le16 *)*p);
128 *p += sizeof(u16);
129}
130static inline void ceph_encode_8(void **p, u8 v)
131{
132 *(u8 *)*p = v;
133 (*p)++;
134}
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800135static inline void ceph_encode_copy(void **p, const void *s, int len)
136{
137 memcpy(*p, s, len);
138 *p += len;
139}
Sage Weil31b80062009-10-06 11:31:13 -0700140
141/*
142 * filepath, string encoders
143 */
144static inline void ceph_encode_filepath(void **p, void *end,
145 u64 ino, const char *path)
146{
147 u32 len = path ? strlen(path) : 0;
148 BUG_ON(*p + sizeof(ino) + sizeof(len) + len > end);
Sage Weilac8839d2010-01-27 14:28:10 -0800149 ceph_encode_8(p, 1);
Sage Weil31b80062009-10-06 11:31:13 -0700150 ceph_encode_64(p, ino);
151 ceph_encode_32(p, len);
152 if (len)
153 memcpy(*p, path, len);
154 *p += len;
155}
156
157static inline void ceph_encode_string(void **p, void *end,
158 const char *s, u32 len)
159{
160 BUG_ON(*p + sizeof(len) + len > end);
161 ceph_encode_32(p, len);
162 if (len)
163 memcpy(*p, s, len);
164 *p += len;
165}
166
Sage Weilc7e337d2010-02-02 16:11:19 -0800167#define ceph_encode_need(p, end, n, bad) \
168 do { \
169 if (unlikely(*(p) + (n) > (end))) \
170 goto bad; \
171 } while (0)
172
173#define ceph_encode_64_safe(p, end, v, bad) \
174 do { \
175 ceph_encode_need(p, end, sizeof(u64), bad); \
176 ceph_encode_64(p, v); \
177 } while (0)
178#define ceph_encode_32_safe(p, end, v, bad) \
179 do { \
180 ceph_encode_need(p, end, sizeof(u32), bad); \
181 ceph_encode_32(p, v); \
182 } while (0)
183#define ceph_encode_16_safe(p, end, v, bad) \
184 do { \
185 ceph_encode_need(p, end, sizeof(u16), bad); \
186 ceph_encode_16(p, v); \
187 } while (0)
188
189#define ceph_encode_copy_safe(p, end, pv, n, bad) \
190 do { \
191 ceph_encode_need(p, end, n, bad); \
192 ceph_encode_copy(p, pv, n); \
193 } while (0)
Yehuda Sadehae1533b2010-05-18 16:38:08 -0700194#define ceph_encode_string_safe(p, end, s, n, bad) \
195 do { \
196 ceph_encode_need(p, end, n, bad); \
197 ceph_encode_string(p, end, s, n); \
198 } while (0)
Sage Weilc7e337d2010-02-02 16:11:19 -0800199
Sage Weil31b80062009-10-06 11:31:13 -0700200
201#endif