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 <linux/bug.h>
5#include <linux/time.h>
6#include <asm/unaligned.h>
7
8#include "types.h"
9
10/*
11 * in all cases,
12 * void **p pointer to position pointer
13 * void *end pointer to end of buffer (last byte + 1)
14 */
15
16static inline u64 ceph_decode_64(void **p)
17{
18 u64 v = get_unaligned_le64(*p);
19 *p += sizeof(u64);
20 return v;
21}
22static inline u32 ceph_decode_32(void **p)
23{
24 u32 v = get_unaligned_le32(*p);
25 *p += sizeof(u32);
26 return v;
27}
28static inline u16 ceph_decode_16(void **p)
29{
30 u16 v = get_unaligned_le16(*p);
31 *p += sizeof(u16);
32 return v;
33}
34static inline u8 ceph_decode_8(void **p)
35{
36 u8 v = *(u8 *)*p;
37 (*p)++;
38 return v;
39}
40static inline void ceph_decode_copy(void **p, void *pv, size_t n)
41{
42 memcpy(pv, *p, n);
43 *p += n;
44}
45
46/*
47 * bounds check input.
48 */
49static inline int ceph_has_room(void **p, void *end, size_t n)
50{
51 return end >= *p && n <= end - *p;
52}
53
54#define ceph_decode_need(p, end, n, bad) \
55 do { \
56 if (!likely(ceph_has_room(p, end, n))) \
57 goto bad; \
58 } while (0)
59
60#define ceph_decode_64_safe(p, end, v, bad) \
61 do { \
62 ceph_decode_need(p, end, sizeof(u64), bad); \
63 v = ceph_decode_64(p); \
64 } while (0)
65#define ceph_decode_32_safe(p, end, v, bad) \
66 do { \
67 ceph_decode_need(p, end, sizeof(u32), bad); \
68 v = ceph_decode_32(p); \
69 } while (0)
70#define ceph_decode_16_safe(p, end, v, bad) \
71 do { \
72 ceph_decode_need(p, end, sizeof(u16), bad); \
73 v = ceph_decode_16(p); \
74 } while (0)
75#define ceph_decode_8_safe(p, end, v, bad) \
76 do { \
77 ceph_decode_need(p, end, sizeof(u8), bad); \
78 v = ceph_decode_8(p); \
79 } while (0)
80
81#define ceph_decode_copy_safe(p, end, pv, n, bad) \
82 do { \
83 ceph_decode_need(p, end, n, bad); \
84 ceph_decode_copy(p, pv, n); \
85 } while (0)
86
87/*
88 * struct ceph_timespec <-> struct timespec
89 */
90static inline void ceph_decode_timespec(struct timespec *ts,
91 const struct ceph_timespec *tv)
92{
93 ts->tv_sec = le32_to_cpu(tv->tv_sec);
94 ts->tv_nsec = le32_to_cpu(tv->tv_nsec);
95}
96static inline void ceph_encode_timespec(struct ceph_timespec *tv,
97 const struct timespec *ts)
98{
99 tv->tv_sec = cpu_to_le32(ts->tv_sec);
100 tv->tv_nsec = cpu_to_le32(ts->tv_nsec);
101}
102
103/*
104 * sockaddr_storage <-> ceph_sockaddr
105 */
106static inline void ceph_encode_addr(struct ceph_entity_addr *a)
107{
108 __be16 ss_family = htons(a->in_addr.ss_family);
109 a->in_addr.ss_family = *(__u16 *)&ss_family;
110}
111static inline void ceph_decode_addr(struct ceph_entity_addr *a)
112{
113 __be16 ss_family = *(__be16 *)&a->in_addr.ss_family;
114 a->in_addr.ss_family = ntohs(ss_family);
115 WARN_ON(a->in_addr.ss_family == 512);
116}
117
118/*
119 * encoders
120 */
121static inline void ceph_encode_64(void **p, u64 v)
122{
123 put_unaligned_le64(v, (__le64 *)*p);
124 *p += sizeof(u64);
125}
126static inline void ceph_encode_32(void **p, u32 v)
127{
128 put_unaligned_le32(v, (__le32 *)*p);
129 *p += sizeof(u32);
130}
131static inline void ceph_encode_16(void **p, u16 v)
132{
133 put_unaligned_le16(v, (__le16 *)*p);
134 *p += sizeof(u16);
135}
136static inline void ceph_encode_8(void **p, u8 v)
137{
138 *(u8 *)*p = v;
139 (*p)++;
140}
141static inline void ceph_encode_copy(void **p, const void *s, int len)
142{
143 memcpy(*p, s, len);
144 *p += len;
145}
146
147/*
148 * filepath, string encoders
149 */
150static inline void ceph_encode_filepath(void **p, void *end,
151 u64 ino, const char *path)
152{
153 u32 len = path ? strlen(path) : 0;
154 BUG_ON(*p + sizeof(ino) + sizeof(len) + len > end);
155 ceph_encode_8(p, 1);
156 ceph_encode_64(p, ino);
157 ceph_encode_32(p, len);
158 if (len)
159 memcpy(*p, path, len);
160 *p += len;
161}
162
163static inline void ceph_encode_string(void **p, void *end,
164 const char *s, u32 len)
165{
166 BUG_ON(*p + sizeof(len) + len > end);
167 ceph_encode_32(p, len);
168 if (len)
169 memcpy(*p, s, len);
170 *p += len;
171}
172
173#define ceph_encode_need(p, end, n, bad) \
174 do { \
175 if (!likely(ceph_has_room(p, end, n))) \
176 goto bad; \
177 } while (0)
178
179#define ceph_encode_64_safe(p, end, v, bad) \
180 do { \
181 ceph_encode_need(p, end, sizeof(u64), bad); \
182 ceph_encode_64(p, v); \
183 } while (0)
184#define ceph_encode_32_safe(p, end, v, bad) \
185 do { \
186 ceph_encode_need(p, end, sizeof(u32), bad); \
187 ceph_encode_32(p, v); \
188 } while (0)
189#define ceph_encode_16_safe(p, end, v, bad) \
190 do { \
191 ceph_encode_need(p, end, sizeof(u16), bad); \
192 ceph_encode_16(p, v); \
193 } while (0)
194
195#define ceph_encode_copy_safe(p, end, pv, n, bad) \
196 do { \
197 ceph_encode_need(p, end, n, bad); \
198 ceph_encode_copy(p, pv, n); \
199 } while (0)
200#define ceph_encode_string_safe(p, end, s, n, bad) \
201 do { \
202 ceph_encode_need(p, end, n, bad); \
203 ceph_encode_string(p, end, s, n); \
204 } while (0)
205
206
207#endif