1
2#ifndef __CEPH_DECODE_H
3#define __CEPH_DECODE_H
4
5#include <linux/err.h>
6#include <linux/bug.h>
7#include <linux/slab.h>
8#include <linux/time.h>
9#include <asm/unaligned.h>
10
11#include <linux/ceph/types.h>
12
13
14
15
16
17
18
19static inline u64 ceph_decode_64(void **p)
20{
21 u64 v = get_unaligned_le64(*p);
22 *p += sizeof(u64);
23 return v;
24}
25static inline u32 ceph_decode_32(void **p)
26{
27 u32 v = get_unaligned_le32(*p);
28 *p += sizeof(u32);
29 return v;
30}
31static inline u16 ceph_decode_16(void **p)
32{
33 u16 v = get_unaligned_le16(*p);
34 *p += sizeof(u16);
35 return v;
36}
37static inline u8 ceph_decode_8(void **p)
38{
39 u8 v = *(u8 *)*p;
40 (*p)++;
41 return v;
42}
43static inline void ceph_decode_copy(void **p, void *pv, size_t n)
44{
45 memcpy(pv, *p, n);
46 *p += n;
47}
48
49
50
51
52static inline bool ceph_has_room(void **p, void *end, size_t n)
53{
54 return end >= *p && n <= end - *p;
55}
56
57#define ceph_decode_need(p, end, n, bad) \
58 do { \
59 if (!likely(ceph_has_room(p, end, n))) \
60 goto bad; \
61 } while (0)
62
63#define ceph_decode_64_safe(p, end, v, bad) \
64 do { \
65 ceph_decode_need(p, end, sizeof(u64), bad); \
66 v = ceph_decode_64(p); \
67 } while (0)
68#define ceph_decode_32_safe(p, end, v, bad) \
69 do { \
70 ceph_decode_need(p, end, sizeof(u32), bad); \
71 v = ceph_decode_32(p); \
72 } while (0)
73#define ceph_decode_16_safe(p, end, v, bad) \
74 do { \
75 ceph_decode_need(p, end, sizeof(u16), bad); \
76 v = ceph_decode_16(p); \
77 } while (0)
78#define ceph_decode_8_safe(p, end, v, bad) \
79 do { \
80 ceph_decode_need(p, end, sizeof(u8), bad); \
81 v = ceph_decode_8(p); \
82 } while (0)
83
84#define ceph_decode_copy_safe(p, end, pv, n, bad) \
85 do { \
86 ceph_decode_need(p, end, n, bad); \
87 ceph_decode_copy(p, pv, n); \
88 } while (0)
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107static inline char *ceph_extract_encoded_string(void **p, void *end,
108 size_t *lenp, gfp_t gfp)
109{
110 u32 len;
111 void *sp = *p;
112 char *buf;
113
114 ceph_decode_32_safe(&sp, end, len, bad);
115 if (!ceph_has_room(&sp, end, len))
116 goto bad;
117
118 buf = kmalloc(len + 1, gfp);
119 if (!buf)
120 return ERR_PTR(-ENOMEM);
121
122 if (len)
123 memcpy(buf, sp, len);
124 buf[len] = '\0';
125
126 *p = (char *) *p + sizeof (u32) + len;
127 if (lenp)
128 *lenp = (size_t) len;
129
130 return buf;
131
132bad:
133 return ERR_PTR(-ERANGE);
134}
135
136
137
138
139#define ceph_decode_skip_n(p, end, n, bad) \
140 do { \
141 ceph_decode_need(p, end, n, bad); \
142 *p += n; \
143 } while (0)
144
145#define ceph_decode_skip_64(p, end, bad) \
146ceph_decode_skip_n(p, end, sizeof(u64), bad)
147
148#define ceph_decode_skip_32(p, end, bad) \
149ceph_decode_skip_n(p, end, sizeof(u32), bad)
150
151#define ceph_decode_skip_16(p, end, bad) \
152ceph_decode_skip_n(p, end, sizeof(u16), bad)
153
154#define ceph_decode_skip_8(p, end, bad) \
155ceph_decode_skip_n(p, end, sizeof(u8), bad)
156
157#define ceph_decode_skip_string(p, end, bad) \
158 do { \
159 u32 len; \
160 \
161 ceph_decode_32_safe(p, end, len, bad); \
162 ceph_decode_skip_n(p, end, len, bad); \
163 } while (0)
164
165#define ceph_decode_skip_set(p, end, type, bad) \
166 do { \
167 u32 len; \
168 \
169 ceph_decode_32_safe(p, end, len, bad); \
170 while (len--) \
171 ceph_decode_skip_##type(p, end, bad); \
172 } while (0)
173
174#define ceph_decode_skip_map(p, end, ktype, vtype, bad) \
175 do { \
176 u32 len; \
177 \
178 ceph_decode_32_safe(p, end, len, bad); \
179 while (len--) { \
180 ceph_decode_skip_##ktype(p, end, bad); \
181 ceph_decode_skip_##vtype(p, end, bad); \
182 } \
183 } while (0)
184
185#define ceph_decode_skip_map_of_map(p, end, ktype1, ktype2, vtype2, bad) \
186 do { \
187 u32 len; \
188 \
189 ceph_decode_32_safe(p, end, len, bad); \
190 while (len--) { \
191 ceph_decode_skip_##ktype1(p, end, bad); \
192 ceph_decode_skip_map(p, end, ktype2, vtype2, bad); \
193 } \
194 } while (0)
195
196
197
198
199static inline void ceph_decode_timespec64(struct timespec64 *ts,
200 const struct ceph_timespec *tv)
201{
202
203
204
205
206
207
208 ts->tv_sec = (time64_t)le32_to_cpu(tv->tv_sec);
209 ts->tv_nsec = (long)le32_to_cpu(tv->tv_nsec);
210}
211static inline void ceph_encode_timespec64(struct ceph_timespec *tv,
212 const struct timespec64 *ts)
213{
214 tv->tv_sec = cpu_to_le32((u32)ts->tv_sec);
215 tv->tv_nsec = cpu_to_le32((u32)ts->tv_nsec);
216}
217
218
219
220
221#define CEPH_ENTITY_ADDR_TYPE_NONE 0
222#define CEPH_ENTITY_ADDR_TYPE_LEGACY __cpu_to_le32(1)
223
224static inline void ceph_encode_banner_addr(struct ceph_entity_addr *a)
225{
226 __be16 ss_family = htons(a->in_addr.ss_family);
227 a->in_addr.ss_family = *(__u16 *)&ss_family;
228
229
230 a->type = CEPH_ENTITY_ADDR_TYPE_NONE;
231}
232static inline void ceph_decode_banner_addr(struct ceph_entity_addr *a)
233{
234 __be16 ss_family = *(__be16 *)&a->in_addr.ss_family;
235 a->in_addr.ss_family = ntohs(ss_family);
236 WARN_ON(a->in_addr.ss_family == 512);
237 a->type = CEPH_ENTITY_ADDR_TYPE_LEGACY;
238}
239
240extern int ceph_decode_entity_addr(void **p, void *end,
241 struct ceph_entity_addr *addr);
242
243
244
245static inline void ceph_encode_64(void **p, u64 v)
246{
247 put_unaligned_le64(v, (__le64 *)*p);
248 *p += sizeof(u64);
249}
250static inline void ceph_encode_32(void **p, u32 v)
251{
252 put_unaligned_le32(v, (__le32 *)*p);
253 *p += sizeof(u32);
254}
255static inline void ceph_encode_16(void **p, u16 v)
256{
257 put_unaligned_le16(v, (__le16 *)*p);
258 *p += sizeof(u16);
259}
260static inline void ceph_encode_8(void **p, u8 v)
261{
262 *(u8 *)*p = v;
263 (*p)++;
264}
265static inline void ceph_encode_copy(void **p, const void *s, int len)
266{
267 memcpy(*p, s, len);
268 *p += len;
269}
270
271
272
273
274static inline void ceph_encode_filepath(void **p, void *end,
275 u64 ino, const char *path)
276{
277 u32 len = path ? strlen(path) : 0;
278 BUG_ON(*p + 1 + sizeof(ino) + sizeof(len) + len > end);
279 ceph_encode_8(p, 1);
280 ceph_encode_64(p, ino);
281 ceph_encode_32(p, len);
282 if (len)
283 memcpy(*p, path, len);
284 *p += len;
285}
286
287static inline void ceph_encode_string(void **p, void *end,
288 const char *s, u32 len)
289{
290 BUG_ON(*p + sizeof(len) + len > end);
291 ceph_encode_32(p, len);
292 if (len)
293 memcpy(*p, s, len);
294 *p += len;
295}
296
297
298
299
300
301
302#define CEPH_ENCODING_START_BLK_LEN 6
303
304
305
306
307
308
309
310static inline void ceph_start_encoding(void **p, u8 struct_v, u8 struct_compat,
311 u32 struct_len)
312{
313 ceph_encode_8(p, struct_v);
314 ceph_encode_8(p, struct_compat);
315 ceph_encode_32(p, struct_len);
316}
317
318
319
320
321
322
323
324
325
326
327
328static inline int ceph_start_decoding(void **p, void *end, u8 v,
329 const char *name, u8 *struct_v,
330 u32 *struct_len)
331{
332 u8 struct_compat;
333
334 ceph_decode_need(p, end, CEPH_ENCODING_START_BLK_LEN, bad);
335 *struct_v = ceph_decode_8(p);
336 struct_compat = ceph_decode_8(p);
337 if (v < struct_compat) {
338 pr_warn("got struct_v %d struct_compat %d > %d of %s\n",
339 *struct_v, struct_compat, v, name);
340 return -EINVAL;
341 }
342
343 *struct_len = ceph_decode_32(p);
344 ceph_decode_need(p, end, *struct_len, bad);
345 return 0;
346
347bad:
348 return -ERANGE;
349}
350
351#define ceph_encode_need(p, end, n, bad) \
352 do { \
353 if (!likely(ceph_has_room(p, end, n))) \
354 goto bad; \
355 } while (0)
356
357#define ceph_encode_64_safe(p, end, v, bad) \
358 do { \
359 ceph_encode_need(p, end, sizeof(u64), bad); \
360 ceph_encode_64(p, v); \
361 } while (0)
362#define ceph_encode_32_safe(p, end, v, bad) \
363 do { \
364 ceph_encode_need(p, end, sizeof(u32), bad); \
365 ceph_encode_32(p, v); \
366 } while (0)
367#define ceph_encode_16_safe(p, end, v, bad) \
368 do { \
369 ceph_encode_need(p, end, sizeof(u16), bad); \
370 ceph_encode_16(p, v); \
371 } while (0)
372#define ceph_encode_8_safe(p, end, v, bad) \
373 do { \
374 ceph_encode_need(p, end, sizeof(u8), bad); \
375 ceph_encode_8(p, v); \
376 } while (0)
377
378#define ceph_encode_copy_safe(p, end, pv, n, bad) \
379 do { \
380 ceph_encode_need(p, end, n, bad); \
381 ceph_encode_copy(p, pv, n); \
382 } while (0)
383#define ceph_encode_string_safe(p, end, s, n, bad) \
384 do { \
385 ceph_encode_need(p, end, n, bad); \
386 ceph_encode_string(p, end, s, n); \
387 } while (0)
388
389
390#endif
391