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Code Editor : reglib.h
#ifndef REG_LIB_H #define REG_LIB_H #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <stdbool.h> #include <sys/stat.h> #include <math.h> #include "regdb.h" /* Common regulatory structures, functions and helpers */ /* This matches the kernel's data structures */ struct ieee80211_freq_range { uint32_t start_freq_khz; uint32_t end_freq_khz; uint32_t max_bandwidth_khz; }; struct ieee80211_power_rule { uint32_t max_antenna_gain; uint32_t max_eirp; }; struct ieee80211_reg_rule { struct ieee80211_freq_range freq_range; struct ieee80211_power_rule power_rule; uint32_t flags; }; struct ieee80211_regdomain { uint32_t n_reg_rules; char alpha2[2]; uint8_t dfs_region; struct ieee80211_reg_rule reg_rules[]; }; /* Remove this once upstream nl80211.h gets this */ #define NL80211_RRF_NO_IR (1<<7) #define REGLIB_MHZ_TO_KHZ(freq) ((freq) * 1000) #define REGLIB_KHZ_TO_MHZ(freq) ((freq) / 1000) #define REGLIB_DBI_TO_MBI(gain) ((gain) * 100) #define REGLIB_MBI_TO_DBI(gain) ((gain) / 100) #define REGLIB_DBM_TO_MBM(gain) ((gain) * 100) #define REGLIB_MBM_TO_DBM(gain) ((gain) / 100) #define REGLIB_MW_TO_DBM(gain) (10 * log10(gain)) #define REGLIB_MW_TO_MBM(gain) (REGLIB_DBM_TO_MBM(REGLIB_MW_TO_DBM(gain))) /** * struct reglib_regdb_ctx - reglib regdb context * * This can be used to interat with reglib without * having to open() / close() / mmap() / munmap() * and check the regdb binary file for integrity and * authorship. * * @fd: file descriptor of the db * @stat: @fd fstat() * @db: mmap() of the db of @real_dblen * @real_dblen: file size in bytes of @fd * @siglen: size in bytes of the signature at the end of the file * @dblen: database lenghth, this is the @real_dblen - @siglen * @verified: whether or not this regdb has been RSA verified. * This value is dependent on whether or not you enabled * signature verification with gcrypt, openssl, or none * at all. If no signature verification was not compiled * in then this will always be true otherwise this will * only be true if the RSA digital signature of the SHA1 * sum of the regulatory database at the end of the * regulatory database can be verified with the one of * the trusted public keys. */ struct reglib_regdb_ctx { int fd; struct stat stat; uint8_t *db; uint32_t real_dblen; uint32_t siglen; uint32_t dblen; bool verified; struct regdb_file_header *header; uint32_t num_countries; struct regdb_file_reg_country *countries; }; static inline int reglib_is_world_regdom(const char *alpha2) { if (alpha2[0] == '0' && alpha2[1] == '0') return 1; return 0; } static inline int reglib_isalpha_upper(char letter) { if (letter >= 'A' && letter <= 'Z') return 1; return 0; } static inline int reglib_is_alpha2(const char *alpha2) { if (reglib_isalpha_upper(alpha2[0]) && reglib_isalpha_upper(alpha2[1])) return 1; return 0; } static inline int reglib_is_valid_regdom(const char *alpha2) { if (!reglib_is_alpha2(alpha2) && !reglib_is_world_regdom(alpha2)) return 0; return 1; } static inline uint32_t reglib_max(uint32_t a, uint32_t b) { return (a > b) ? a : b; } static inline uint32_t reglib_min(uint32_t a, uint32_t b) { return (a > b) ? b : a; } void * reglib_get_file_ptr(uint8_t *db, size_t dblen, size_t structlen, uint32_t ptr); int reglib_verify_db_signature(uint8_t *db, size_t dblen, size_t siglen); /** * reglib_malloc_regdb_ctx - create a regdb context for usage with reglib * * @regdb_file: file name * * Most operations on reglib iterate over the database somehow and prior * to iterating over it it must check the signature. Use this context helper * to let you query the db within different contexts in your program and * just be sure to call reglib_free_regdb_ctx() when done. This helper will * open the file passed and mmap() it. */ const struct reglib_regdb_ctx *reglib_malloc_regdb_ctx(const char *regdb_file); /** * reglib_free_regdb_ctx - free a regdb context used with reglib * * @regdb_ctx: the reglib regdb context created with reglib_malloc_regdb_ctx() * * This will do all the handy work to close up, munmap, and free the * reglib regdb context passed. */ void reglib_free_regdb_ctx(const struct reglib_regdb_ctx *regdb_ctx); const struct ieee80211_regdomain * reglib_get_rd_idx(unsigned int idx, const struct reglib_regdb_ctx *ctx); #define reglib_for_each_country(__rd, __idx, __ctx) \ for (__rd = reglib_get_rd_idx(__idx, __ctx); \ __rd != NULL; \ __rd = reglib_get_rd_idx(++__idx, __ctx)) \ const struct ieee80211_regdomain * reglib_get_rd_alpha2(const char *alpha2, const char *file); /** * reglib_is_valid_rd - validate regulatory domain data structure * * @rd: regulatory domain data structure to validate * * You can use this to validate regulatory domain data structures * for possible inconsistencies. */ int reglib_is_valid_rd(const struct ieee80211_regdomain *rd); /* reg helpers */ void reglib_print_regdom(const struct ieee80211_regdomain *rd); struct ieee80211_regdomain * reglib_intersect_rds(const struct ieee80211_regdomain *rd1, const struct ieee80211_regdomain *rd2); /** * reglib_intersect_regdb - intersects a regulatory database * * @regdb_file: the regulatory database to intersect * * Goes through an entire regulatory database and intersects all regulatory * domains. This will skip any regulatory marked with an alpha2 of '00', which * is used to indicate a world regulatory domain. If intersection is able * to find rules that fit all regulatory domains it return a regulatory * domain with such rules otherwise it returns NULL. */ const struct ieee80211_regdomain * reglib_intersect_regdb(const struct reglib_regdb_ctx *ctx); /** * @reglib_create_parse_stream - provide a clean new stream for processing * * @fp: FILE stream, could be stdin, or a stream from an open file. * * In order to parse a stream we recommend to create a new stream * using this helper. A new stream is preferred in order to work * with stdin, as otherwise we cannot rewind() and move around * the stream. This helper will create new stream using tmpfile() * and also remove all comments. It will be closed and the file * deleted when the process terminates. */ FILE *reglib_create_parse_stream(FILE *fp); /** * @reglib_parse_country - parse stream to build a regulatory domain * * @fp: FILE stream, could be stdin, or a stream from an open file. * * Parse stream and return back a built regulatory domain. Returns * NULL if one could not be built. */ struct ieee80211_regdomain *reglib_parse_country(FILE *fp); /** * @reglib_optimize_regdom - optimize a regulatory domain * * @rd: a regulatory domain to be optimized * * A regulatory domain may exist without optimal expressions * over its rules. This will look for regulatory rules that can * be combined together to reduce the size of the regulatory * domain and its expression. * * Regulatory rules will be combined if their max allowed * bandwidth, max EIRP, and flags all match. */ struct ieee80211_regdomain * reglib_optimize_regdom(struct ieee80211_regdomain *rd); #define reglib_for_each_country_stream(__fp, __rd) \ for (__rd = reglib_parse_country(__fp); \ __rd != NULL; \ __rd = reglib_parse_country(__fp)) \ #endif
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