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 #define ceph_decode_need(p, end, n, bad) \ 50 do { \ 51 if (unlikely(*(p) + (n) > (end))) \ 52 goto bad; \ 53 } while (0) 54 55 #define ceph_decode_64_safe(p, end, v, bad) \ 56 do { \ 57 ceph_decode_need(p, end, sizeof(u64), bad); \ 58 v = ceph_decode_64(p); \ 59 } while (0) 60 #define ceph_decode_32_safe(p, end, v, bad) \ 61 do { \ 62 ceph_decode_need(p, end, sizeof(u32), bad); \ 63 v = ceph_decode_32(p); \ 64 } while (0) 65 #define ceph_decode_16_safe(p, end, v, bad) \ 66 do { \ 67 ceph_decode_need(p, end, sizeof(u16), bad); \ 68 v = ceph_decode_16(p); \ 69 } while (0) 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) 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 */ 85 static inline void ceph_decode_timespec(struct timespec *ts, 86 const struct ceph_timespec *tv) 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, 92 const struct timespec *ts) 93 { 94 tv->tv_sec = cpu_to_le32(ts->tv_sec); 95 tv->tv_nsec = cpu_to_le32(ts->tv_nsec); 96 } 97 98 /* 99 * sockaddr_storage <-> ceph_sockaddr 100 */ 101 static inline void ceph_encode_addr(struct ceph_entity_addr *a) 102 { 103 __be16 ss_family = htons(a->in_addr.ss_family); 104 a->in_addr.ss_family = *(__u16 *)&ss_family; 105 } 106 static inline void ceph_decode_addr(struct ceph_entity_addr *a) 107 { 108 __be16 ss_family = *(__be16 *)&a->in_addr.ss_family; 109 a->in_addr.ss_family = ntohs(ss_family); 110 WARN_ON(a->in_addr.ss_family == 512); 111 } 112 113 /* 114 * encoders 115 */ 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 } 136 static inline void ceph_encode_copy(void **p, const void *s, int len) 137 { 138 memcpy(*p, s, len); 139 *p += len; 140 } 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); 150 ceph_encode_8(p, 1); 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 } 167 168 #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) 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) 200 201 202 #endif 203