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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 */ |
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) |
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) |
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); |
158 | ts->tv_nsec = (long)le32_to_cpu(tv->tv_nsec); | |
c89136ea SW |
159 | } |
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); |
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); |
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; |
178 | a->in_addr.ss_family = ntohs(ss_family); | |
4e7a5dcd | 179 | WARN_ON(a->in_addr.ss_family == 512); |
63f2d211 SW |
180 | } |
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 | |
276 | #endif |