1 /* 2 * Copyright (C) 2010-2012 Felix Fietkau <nbd@openwrt.org> 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 #ifndef __BLOBMSG_H 17 #define __BLOBMSG_H 18 19 #include <stdarg.h> 20 #include "blob.h" 21 22 #define BLOBMSG_ALIGN 2 23 #define BLOBMSG_PADDING(len) (((len) + (1 << BLOBMSG_ALIGN) - 1) & ~((1 << BLOBMSG_ALIGN) - 1)) 24 25 enum blobmsg_type { 26 BLOBMSG_TYPE_UNSPEC, 27 BLOBMSG_TYPE_ARRAY, 28 BLOBMSG_TYPE_TABLE, 29 BLOBMSG_TYPE_STRING, 30 BLOBMSG_TYPE_INT64, 31 BLOBMSG_TYPE_INT32, 32 BLOBMSG_TYPE_INT16, 33 BLOBMSG_TYPE_INT8, 34 BLOBMSG_TYPE_BOOL = BLOBMSG_TYPE_INT8, 35 BLOBMSG_TYPE_DOUBLE, 36 __BLOBMSG_TYPE_LAST, 37 BLOBMSG_TYPE_LAST = __BLOBMSG_TYPE_LAST - 1, 38 BLOBMSG_CAST_INT64 = __BLOBMSG_TYPE_LAST, 39 }; 40 41 struct blobmsg_hdr { 42 uint16_t namelen; 43 uint8_t name[]; 44 } __packed; 45 46 struct blobmsg_policy { 47 const char *name; 48 enum blobmsg_type type; 49 }; 50 51 static inline int blobmsg_hdrlen(unsigned int namelen) 52 { 53 return BLOBMSG_PADDING(sizeof(struct blobmsg_hdr) + namelen + 1); 54 } 55 56 static inline void blobmsg_clear_name(struct blob_attr *attr) 57 { 58 struct blobmsg_hdr *hdr = (struct blobmsg_hdr *) blob_data(attr); 59 hdr->name[0] = 0; 60 } 61 62 static inline const char *blobmsg_name(const struct blob_attr *attr) 63 { 64 struct blobmsg_hdr *hdr = (struct blobmsg_hdr *) blob_data(attr); 65 return (const char *) hdr->name; 66 } 67 68 static inline int blobmsg_type(const struct blob_attr *attr) 69 { 70 return blob_id(attr); 71 } 72 73 static uint16_t blobmsg_namelen(const struct blobmsg_hdr *hdr) 74 { 75 return be16_to_cpu(hdr->namelen); 76 } 77 78 static inline void *blobmsg_data(const struct blob_attr *attr) 79 { 80 struct blobmsg_hdr *hdr; 81 char *data; 82 83 if (!attr) 84 return NULL; 85 86 hdr = (struct blobmsg_hdr *) blob_data(attr); 87 data = (char *) blob_data(attr); 88 89 if (blob_is_extended(attr)) 90 data += blobmsg_hdrlen(blobmsg_namelen(hdr)); 91 92 return data; 93 } 94 95 static inline size_t blobmsg_data_len(const struct blob_attr *attr) 96 { 97 uint8_t *start, *end; 98 99 if (!attr) 100 return 0; 101 102 start = (uint8_t *) blob_data(attr); 103 end = (uint8_t *) blobmsg_data(attr); 104 105 return blob_len(attr) - (end - start); 106 } 107 108 static inline size_t blobmsg_len(const struct blob_attr *attr) 109 { 110 return blobmsg_data_len(attr); 111 } 112 113 /* 114 * blobmsg_check_attr: validate a list of attributes 115 * 116 * This method may be used with trusted data only. Providing 117 * malformed blobs will cause out of bounds memory access. 118 */ 119 bool blobmsg_check_attr(const struct blob_attr *attr, bool name); 120 121 /* 122 * blobmsg_check_attr_len: validate a list of attributes 123 * 124 * This method should be safer implementation of blobmsg_check_attr. 125 * It will limit all memory access performed on the blob to the 126 * range [attr, attr + len] (upper bound non inclusive) and is 127 * thus suited for checking of untrusted blob attributes. 128 */ 129 bool blobmsg_check_attr_len(const struct blob_attr *attr, bool name, size_t len); 130 131 /* 132 * blobmsg_check_attr_list: validate a list of attributes 133 * 134 * This method may be used with trusted data only. Providing 135 * malformed blobs will cause out of bounds memory access. 136 */ 137 bool blobmsg_check_attr_list(const struct blob_attr *attr, int type); 138 139 /* 140 * blobmsg_check_attr_list_len: validate a list of untrusted attributes 141 * 142 * This method should be safer implementation of blobmsg_check_attr_list. 143 * It will limit all memory access performed on the blob to the 144 * range [attr, attr + len] (upper bound non inclusive) and is 145 * thus suited for checking of untrusted blob attributes. 146 */ 147 bool blobmsg_check_attr_list_len(const struct blob_attr *attr, int type, size_t len); 148 149 /* 150 * blobmsg_check_array: validate array/table and return size 151 * 152 * Checks if all elements of an array or table are valid and have 153 * the specified type. Returns the number of elements in the array 154 * 155 * This method may be used with trusted data only. Providing 156 * malformed blobs will cause out of bounds memory access. 157 */ 158 int blobmsg_check_array(const struct blob_attr *attr, int type); 159 160 /* 161 * blobmsg_check_array_len: validate untrusted array/table and return size 162 * 163 * Checks if all elements of an array or table are valid and have 164 * the specified type. Returns the number of elements in the array. 165 * 166 * This method should be safer implementation of blobmsg_check_array. 167 * It will limit all memory access performed on the blob to the 168 * range [attr, attr + len] (upper bound non inclusive) and is 169 * thus suited for checking of untrusted blob attributes. 170 */ 171 int blobmsg_check_array_len(const struct blob_attr *attr, int type, size_t len); 172 173 int blobmsg_parse(const struct blobmsg_policy *policy, int policy_len, 174 struct blob_attr **tb, void *data, unsigned int len); 175 int blobmsg_parse_array(const struct blobmsg_policy *policy, int policy_len, 176 struct blob_attr **tb, void *data, unsigned int len); 177 178 int blobmsg_add_field(struct blob_buf *buf, int type, const char *name, 179 const void *data, unsigned int len); 180 181 static inline int 182 blobmsg_add_double(struct blob_buf *buf, const char *name, double val) 183 { 184 union { 185 double d; 186 uint64_t u64; 187 } v; 188 v.d = val; 189 v.u64 = cpu_to_be64(v.u64); 190 return blobmsg_add_field(buf, BLOBMSG_TYPE_DOUBLE, name, &v.u64, 8); 191 } 192 193 static inline int 194 blobmsg_add_u8(struct blob_buf *buf, const char *name, uint8_t val) 195 { 196 return blobmsg_add_field(buf, BLOBMSG_TYPE_INT8, name, &val, 1); 197 } 198 199 static inline int 200 blobmsg_add_u16(struct blob_buf *buf, const char *name, uint16_t val) 201 { 202 val = cpu_to_be16(val); 203 return blobmsg_add_field(buf, BLOBMSG_TYPE_INT16, name, &val, 2); 204 } 205 206 static inline int 207 blobmsg_add_u32(struct blob_buf *buf, const char *name, uint32_t val) 208 { 209 val = cpu_to_be32(val); 210 return blobmsg_add_field(buf, BLOBMSG_TYPE_INT32, name, &val, 4); 211 } 212 213 static inline int 214 blobmsg_add_u64(struct blob_buf *buf, const char *name, uint64_t val) 215 { 216 val = cpu_to_be64(val); 217 return blobmsg_add_field(buf, BLOBMSG_TYPE_INT64, name, &val, 8); 218 } 219 220 static inline int 221 blobmsg_add_string(struct blob_buf *buf, const char *name, const char *string) 222 { 223 return blobmsg_add_field(buf, BLOBMSG_TYPE_STRING, name, string, strlen(string) + 1); 224 } 225 226 static inline int 227 blobmsg_add_blob(struct blob_buf *buf, struct blob_attr *attr) 228 { 229 return blobmsg_add_field(buf, blobmsg_type(attr), blobmsg_name(attr), 230 blobmsg_data(attr), blobmsg_data_len(attr)); 231 } 232 233 void *blobmsg_open_nested(struct blob_buf *buf, const char *name, bool array); 234 235 static inline void * 236 blobmsg_open_array(struct blob_buf *buf, const char *name) 237 { 238 return blobmsg_open_nested(buf, name, true); 239 } 240 241 static inline void * 242 blobmsg_open_table(struct blob_buf *buf, const char *name) 243 { 244 return blobmsg_open_nested(buf, name, false); 245 } 246 247 static inline void 248 blobmsg_close_array(struct blob_buf *buf, void *cookie) 249 { 250 blob_nest_end(buf, cookie); 251 } 252 253 static inline void 254 blobmsg_close_table(struct blob_buf *buf, void *cookie) 255 { 256 blob_nest_end(buf, cookie); 257 } 258 259 static inline int blobmsg_buf_init(struct blob_buf *buf) 260 { 261 return blob_buf_init(buf, BLOBMSG_TYPE_TABLE); 262 } 263 264 static inline uint8_t blobmsg_get_u8(struct blob_attr *attr) 265 { 266 return *(uint8_t *) blobmsg_data(attr); 267 } 268 269 static inline bool blobmsg_get_bool(struct blob_attr *attr) 270 { 271 return *(uint8_t *) blobmsg_data(attr); 272 } 273 274 static inline uint16_t blobmsg_get_u16(struct blob_attr *attr) 275 { 276 return be16_to_cpu(*(uint16_t *) blobmsg_data(attr)); 277 } 278 279 static inline uint32_t blobmsg_get_u32(struct blob_attr *attr) 280 { 281 return be32_to_cpu(*(uint32_t *) blobmsg_data(attr)); 282 } 283 284 static inline uint64_t blobmsg_get_u64(struct blob_attr *attr) 285 { 286 uint32_t *ptr = (uint32_t *) blobmsg_data(attr); 287 uint64_t tmp = ((uint64_t) be32_to_cpu(ptr[0])) << 32; 288 tmp |= be32_to_cpu(ptr[1]); 289 return tmp; 290 } 291 292 static inline uint64_t blobmsg_cast_u64(struct blob_attr *attr) 293 { 294 uint64_t tmp = 0; 295 296 if (blobmsg_type(attr) == BLOBMSG_TYPE_INT64) 297 tmp = blobmsg_get_u64(attr); 298 else if (blobmsg_type(attr) == BLOBMSG_TYPE_INT32) 299 tmp = blobmsg_get_u32(attr); 300 else if (blobmsg_type(attr) == BLOBMSG_TYPE_INT16) 301 tmp = blobmsg_get_u16(attr); 302 else if (blobmsg_type(attr) == BLOBMSG_TYPE_INT8) 303 tmp = blobmsg_get_u8(attr); 304 305 return tmp; 306 } 307 308 static inline int64_t blobmsg_cast_s64(struct blob_attr *attr) 309 { 310 int64_t tmp = 0; 311 312 if (blobmsg_type(attr) == BLOBMSG_TYPE_INT64) 313 tmp = blobmsg_get_u64(attr); 314 else if (blobmsg_type(attr) == BLOBMSG_TYPE_INT32) 315 tmp = (int32_t)blobmsg_get_u32(attr); 316 else if (blobmsg_type(attr) == BLOBMSG_TYPE_INT16) 317 tmp = (int16_t)blobmsg_get_u16(attr); 318 else if (blobmsg_type(attr) == BLOBMSG_TYPE_INT8) 319 tmp = (int8_t)blobmsg_get_u8(attr); 320 321 return tmp; 322 } 323 324 static inline double blobmsg_get_double(struct blob_attr *attr) 325 { 326 union { 327 double d; 328 uint64_t u64; 329 } v; 330 v.u64 = blobmsg_get_u64(attr); 331 return v.d; 332 } 333 334 static inline char *blobmsg_get_string(struct blob_attr *attr) 335 { 336 if (!attr) 337 return NULL; 338 339 return (char *) blobmsg_data(attr); 340 } 341 342 void *blobmsg_alloc_string_buffer(struct blob_buf *buf, const char *name, unsigned int maxlen); 343 void *blobmsg_realloc_string_buffer(struct blob_buf *buf, unsigned int maxlen); 344 void blobmsg_add_string_buffer(struct blob_buf *buf); 345 346 int blobmsg_vprintf(struct blob_buf *buf, const char *name, const char *format, va_list arg); 347 int blobmsg_printf(struct blob_buf *buf, const char *name, const char *format, ...) 348 __attribute__((format(printf, 3, 4))); 349 350 #define blobmsg_for_each_attr(pos, attr, rem) \ 351 for (rem = attr ? blobmsg_data_len(attr) : 0, \ 352 pos = (struct blob_attr *) (attr ? blobmsg_data(attr) : NULL); \ 353 rem >= sizeof(struct blob_attr) && (blob_pad_len(pos) <= rem) && \ 354 (blob_pad_len(pos) >= sizeof(struct blob_attr)); \ 355 rem -= blob_pad_len(pos), pos = blob_next(pos)) 356 357 #define __blobmsg_for_each_attr(pos, attr, rem) \ 358 for (pos = (struct blob_attr *) (attr ? blobmsg_data(attr) : NULL); \ 359 rem >= sizeof(struct blob_attr) && (blob_pad_len(pos) <= rem) && \ 360 (blob_pad_len(pos) >= sizeof(struct blob_attr)); \ 361 rem -= blob_pad_len(pos), pos = blob_next(pos)) 362 363 #endif 364
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