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 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 46 /* 47 * bounds check input. 48 */ 49 static 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 */ 90 static 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 } 96 static 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 */ 106 static 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 } 111 static 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 */ 121 static inline void ceph_encode_64(void **p, u64 v) 122 { 123 put_unaligned_le64(v, (__le64 *)*p); 124 *p += sizeof(u64); 125 } 126 static inline void ceph_encode_32(void **p, u32 v) 127 { 128 put_unaligned_le32(v, (__le32 *)*p); 129 *p += sizeof(u32); 130 } 131 static inline void ceph_encode_16(void **p, u16 v) 132 { 133 put_unaligned_le16(v, (__le16 *)*p); 134 *p += sizeof(u16); 135 } 136 static inline void ceph_encode_8(void **p, u8 v) 137 { 138 *(u8 *)*p = v; 139 (*p)++; 140 } 141 static 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 */ 150 static 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 } 162 163 static 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 208