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31b8006e SW |
1 | #ifndef __CEPH_DECODE_H |
2 | #define __CEPH_DECODE_H | |
3 | ||
187f1882 | 4 | #include <linux/bug.h> |
c7e337d6 | 5 | #include <linux/time.h> |
187f1882 | 6 | #include <asm/unaligned.h> |
31b8006e | 7 | |
c89136ea SW |
8 | #include "types.h" |
9 | ||
31b8006e SW |
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 | ||
c89136ea SW |
16 | static inline u64 ceph_decode_64(void **p) |
17 | { | |
18 | u64 v = get_unaligned_le64(*p); | |
19 | *p += sizeof(u64); | |
20 | return v; | |
21 | } | |
22 | static inline u32 ceph_decode_32(void **p) | |
23 | { | |
24 | u32 v = get_unaligned_le32(*p); | |
25 | *p += sizeof(u32); | |
26 | return v; | |
27 | } | |
28 | static inline u16 ceph_decode_16(void **p) | |
29 | { | |
30 | u16 v = get_unaligned_le16(*p); | |
31 | *p += sizeof(u16); | |
32 | return v; | |
33 | } | |
34 | static inline u8 ceph_decode_8(void **p) | |
35 | { | |
36 | u8 v = *(u8 *)*p; | |
37 | (*p)++; | |
38 | return v; | |
39 | } | |
40 | static inline void ceph_decode_copy(void **p, void *pv, size_t n) | |
41 | { | |
42 | memcpy(pv, *p, n); | |
43 | *p += n; | |
44 | } | |
45 | ||
31b8006e SW |
46 | /* |
47 | * bounds check input. | |
48 | */ | |
49 | #define ceph_decode_need(p, end, n, bad) \ | |
50 | do { \ | |
51 | if (unlikely(*(p) + (n) > (end))) \ | |
52 | goto bad; \ | |
53 | } while (0) | |
54 | ||
31b8006e SW |
55 | #define ceph_decode_64_safe(p, end, v, bad) \ |
56 | do { \ | |
57 | ceph_decode_need(p, end, sizeof(u64), bad); \ | |
c89136ea | 58 | v = ceph_decode_64(p); \ |
31b8006e SW |
59 | } while (0) |
60 | #define ceph_decode_32_safe(p, end, v, bad) \ | |
61 | do { \ | |
62 | ceph_decode_need(p, end, sizeof(u32), bad); \ | |
c89136ea | 63 | v = ceph_decode_32(p); \ |
31b8006e SW |
64 | } while (0) |
65 | #define ceph_decode_16_safe(p, end, v, bad) \ | |
66 | do { \ | |
67 | ceph_decode_need(p, end, sizeof(u16), bad); \ | |
c89136ea | 68 | v = ceph_decode_16(p); \ |
31b8006e | 69 | } while (0) |
c7e337d6 SW |
70 | #define ceph_decode_8_safe(p, end, v, bad) \ |
71 | do { \ | |
72 | ceph_decode_need(p, end, sizeof(u8), bad); \ | |
73 | v = ceph_decode_8(p); \ | |
74 | } while (0) | |
31b8006e SW |
75 | |
76 | #define ceph_decode_copy_safe(p, end, pv, n, bad) \ | |
77 | do { \ | |
78 | ceph_decode_need(p, end, n, bad); \ | |
79 | ceph_decode_copy(p, pv, n); \ | |
80 | } while (0) | |
81 | ||
82 | /* | |
83 | * struct ceph_timespec <-> struct timespec | |
84 | */ | |
c89136ea | 85 | static inline void ceph_decode_timespec(struct timespec *ts, |
63f2d211 | 86 | const struct ceph_timespec *tv) |
c89136ea SW |
87 | { |
88 | ts->tv_sec = le32_to_cpu(tv->tv_sec); | |
89 | ts->tv_nsec = le32_to_cpu(tv->tv_nsec); | |
90 | } | |
91 | static inline void ceph_encode_timespec(struct ceph_timespec *tv, | |
63f2d211 | 92 | const struct timespec *ts) |
c89136ea SW |
93 | { |
94 | tv->tv_sec = cpu_to_le32(ts->tv_sec); | |
95 | tv->tv_nsec = cpu_to_le32(ts->tv_nsec); | |
96 | } | |
31b8006e | 97 | |
63f2d211 SW |
98 | /* |
99 | * sockaddr_storage <-> ceph_sockaddr | |
100 | */ | |
101 | static inline void ceph_encode_addr(struct ceph_entity_addr *a) | |
102 | { | |
cd84db6e YS |
103 | __be16 ss_family = htons(a->in_addr.ss_family); |
104 | a->in_addr.ss_family = *(__u16 *)&ss_family; | |
63f2d211 SW |
105 | } |
106 | static inline void ceph_decode_addr(struct ceph_entity_addr *a) | |
107 | { | |
cd84db6e YS |
108 | __be16 ss_family = *(__be16 *)&a->in_addr.ss_family; |
109 | a->in_addr.ss_family = ntohs(ss_family); | |
4e7a5dcd | 110 | WARN_ON(a->in_addr.ss_family == 512); |
63f2d211 SW |
111 | } |
112 | ||
31b8006e SW |
113 | /* |
114 | * encoders | |
115 | */ | |
c89136ea SW |
116 | static inline void ceph_encode_64(void **p, u64 v) |
117 | { | |
118 | put_unaligned_le64(v, (__le64 *)*p); | |
119 | *p += sizeof(u64); | |
120 | } | |
121 | static inline void ceph_encode_32(void **p, u32 v) | |
122 | { | |
123 | put_unaligned_le32(v, (__le32 *)*p); | |
124 | *p += sizeof(u32); | |
125 | } | |
126 | static inline void ceph_encode_16(void **p, u16 v) | |
127 | { | |
128 | put_unaligned_le16(v, (__le16 *)*p); | |
129 | *p += sizeof(u16); | |
130 | } | |
131 | static inline void ceph_encode_8(void **p, u8 v) | |
132 | { | |
133 | *(u8 *)*p = v; | |
134 | (*p)++; | |
135 | } | |
4e7a5dcd SW |
136 | static inline void ceph_encode_copy(void **p, const void *s, int len) |
137 | { | |
138 | memcpy(*p, s, len); | |
139 | *p += len; | |
140 | } | |
31b8006e SW |
141 | |
142 | /* | |
143 | * filepath, string encoders | |
144 | */ | |
145 | static inline void ceph_encode_filepath(void **p, void *end, | |
146 | u64 ino, const char *path) | |
147 | { | |
148 | u32 len = path ? strlen(path) : 0; | |
149 | BUG_ON(*p + sizeof(ino) + sizeof(len) + len > end); | |
ac8839d7 | 150 | ceph_encode_8(p, 1); |
31b8006e SW |
151 | ceph_encode_64(p, ino); |
152 | ceph_encode_32(p, len); | |
153 | if (len) | |
154 | memcpy(*p, path, len); | |
155 | *p += len; | |
156 | } | |
157 | ||
158 | static inline void ceph_encode_string(void **p, void *end, | |
159 | const char *s, u32 len) | |
160 | { | |
161 | BUG_ON(*p + sizeof(len) + len > end); | |
162 | ceph_encode_32(p, len); | |
163 | if (len) | |
164 | memcpy(*p, s, len); | |
165 | *p += len; | |
166 | } | |
167 | ||
c7e337d6 SW |
168 | #define ceph_encode_need(p, end, n, bad) \ |
169 | do { \ | |
170 | if (unlikely(*(p) + (n) > (end))) \ | |
171 | goto bad; \ | |
172 | } while (0) | |
173 | ||
174 | #define ceph_encode_64_safe(p, end, v, bad) \ | |
175 | do { \ | |
176 | ceph_encode_need(p, end, sizeof(u64), bad); \ | |
177 | ceph_encode_64(p, v); \ | |
178 | } while (0) | |
179 | #define ceph_encode_32_safe(p, end, v, bad) \ | |
180 | do { \ | |
181 | ceph_encode_need(p, end, sizeof(u32), bad); \ | |
182 | ceph_encode_32(p, v); \ | |
183 | } while (0) | |
184 | #define ceph_encode_16_safe(p, end, v, bad) \ | |
185 | do { \ | |
186 | ceph_encode_need(p, end, sizeof(u16), bad); \ | |
187 | ceph_encode_16(p, v); \ | |
188 | } while (0) | |
189 | ||
190 | #define ceph_encode_copy_safe(p, end, pv, n, bad) \ | |
191 | do { \ | |
192 | ceph_encode_need(p, end, n, bad); \ | |
193 | ceph_encode_copy(p, pv, n); \ | |
194 | } while (0) | |
ae1533b6 YS |
195 | #define ceph_encode_string_safe(p, end, s, n, bad) \ |
196 | do { \ | |
197 | ceph_encode_need(p, end, n, bad); \ | |
198 | ceph_encode_string(p, end, s, n); \ | |
199 | } while (0) | |
c7e337d6 | 200 | |
31b8006e SW |
201 | |
202 | #endif |