Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef __CEPH_DECODE_H
2#define __CEPH_DECODE_H
3
4#include <asm/unaligned.h>
5#include <linux/time.h>
6
7#include "types.h"
8
9/*
10 * in all cases,
11 * void **p pointer to position pointer
12 * void *end pointer to end of buffer (last byte + 1)
13 */
14
15static 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
45/*
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
54#define ceph_decode_64_safe(p, end, v, bad) \
55 do { \
56 ceph_decode_need(p, end, sizeof(u64), bad); \
57 v = ceph_decode_64(p); \
58 } while (0)
59#define ceph_decode_32_safe(p, end, v, bad) \
60 do { \
61 ceph_decode_need(p, end, sizeof(u32), bad); \
62 v = ceph_decode_32(p); \
63 } while (0)
64#define ceph_decode_16_safe(p, end, v, bad) \
65 do { \
66 ceph_decode_need(p, end, sizeof(u16), bad); \
67 v = ceph_decode_16(p); \
68 } while (0)
69#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)
74
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 */
84static inline void ceph_decode_timespec(struct timespec *ts,
85 const struct ceph_timespec *tv)
86{
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,
91 const struct timespec *ts)
92{
93 tv->tv_sec = cpu_to_le32(ts->tv_sec);
94 tv->tv_nsec = cpu_to_le32(ts->tv_nsec);
95}
96
97/*
98 * sockaddr_storage <-> ceph_sockaddr
99 */
100static inline void ceph_encode_addr(struct ceph_entity_addr *a)
101{
102 a->in_addr.ss_family = htons(a->in_addr.ss_family);
103}
104static inline void ceph_decode_addr(struct ceph_entity_addr *a)
105{
106 a->in_addr.ss_family = ntohs(a->in_addr.ss_family);
107 WARN_ON(a->in_addr.ss_family == 512);
108}
109
110/*
111 * encoders
112 */
113static inline void ceph_encode_64(void **p, u64 v)
114{
115 put_unaligned_le64(v, (__le64 *)*p);
116 *p += sizeof(u64);
117}
118static inline void ceph_encode_32(void **p, u32 v)
119{
120 put_unaligned_le32(v, (__le32 *)*p);
121 *p += sizeof(u32);
122}
123static inline void ceph_encode_16(void **p, u16 v)
124{
125 put_unaligned_le16(v, (__le16 *)*p);
126 *p += sizeof(u16);
127}
128static inline void ceph_encode_8(void **p, u8 v)
129{
130 *(u8 *)*p = v;
131 (*p)++;
132}
133static inline void ceph_encode_copy(void **p, const void *s, int len)
134{
135 memcpy(*p, s, len);
136 *p += len;
137}
138
139/*
140 * filepath, string encoders
141 */
142static inline void ceph_encode_filepath(void **p, void *end,
143 u64 ino, const char *path)
144{
145 u32 len = path ? strlen(path) : 0;
146 BUG_ON(*p + sizeof(ino) + sizeof(len) + len > end);
147 ceph_encode_8(p, 1);
148 ceph_encode_64(p, ino);
149 ceph_encode_32(p, len);
150 if (len)
151 memcpy(*p, path, len);
152 *p += len;
153}
154
155static inline void ceph_encode_string(void **p, void *end,
156 const char *s, u32 len)
157{
158 BUG_ON(*p + sizeof(len) + len > end);
159 ceph_encode_32(p, len);
160 if (len)
161 memcpy(*p, s, len);
162 *p += len;
163}
164
165#define ceph_encode_need(p, end, n, bad) \
166 do { \
167 if (unlikely(*(p) + (n) > (end))) \
168 goto bad; \
169 } while (0)
170
171#define ceph_encode_64_safe(p, end, v, bad) \
172 do { \
173 ceph_encode_need(p, end, sizeof(u64), bad); \
174 ceph_encode_64(p, v); \
175 } while (0)
176#define ceph_encode_32_safe(p, end, v, bad) \
177 do { \
178 ceph_encode_need(p, end, sizeof(u32), bad); \
179 ceph_encode_32(p, v); \
180 } while (0)
181#define ceph_encode_16_safe(p, end, v, bad) \
182 do { \
183 ceph_encode_need(p, end, sizeof(u16), bad); \
184 ceph_encode_16(p, v); \
185 } while (0)
186
187#define ceph_encode_copy_safe(p, end, pv, n, bad) \
188 do { \
189 ceph_encode_need(p, end, n, bad); \
190 ceph_encode_copy(p, pv, n); \
191 } while (0)
192
193
194#endif