reglib.c 30.9 KB
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#include <errno.h>
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#include <stdio.h>
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#include <arpa/inet.h>
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#include <sys/types.h>
#include <dirent.h>
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#include <sys/stat.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <fcntl.h>
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#include <stdbool.h>
#include <unistd.h>
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#include <string.h>
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#include <limits.h>
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#include <arpa/inet.h> /* ntohl */

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#include "reglib.h"
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#include "regdb.h"
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#ifdef USE_OPENSSL
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#include <openssl/objects.h>
#include <openssl/rsa.h>
#include <openssl/sha.h>
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#include <openssl/pem.h>
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#endif

#ifdef USE_GCRYPT
#include <gcrypt.h>
#endif

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#include "reglib.h"
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#ifdef USE_OPENSSL
#include "keys-ssl.c"
#endif

#ifdef USE_GCRYPT
#include "keys-gcrypt.c"
#endif

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int debug = 0;

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void *
reglib_get_file_ptr(uint8_t *db, size_t dblen, size_t structlen, uint32_t ptr)
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{
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	uint32_t p = ntohl(ptr);
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	if (structlen > dblen) {
		fprintf(stderr, "Invalid database file, too short!\n");
		exit(3);
	}

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	if (p > dblen - structlen) {
		fprintf(stderr, "Invalid database file, bad pointer!\n");
		exit(3);
	}

	return (void *)(db + p);
}

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static size_t
reglib_array_len(size_t baselen, unsigned int elemcount, size_t elemlen)
{
	if (elemcount > (SIZE_MAX - baselen) / elemlen) {
		fprintf(stderr, "Invalid database file, count too large!\n");
		exit(3);
	}

	return baselen + elemcount * elemlen;
}

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/*
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 * reglib_verify_db_signature():
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 *
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 * Checks the validity of the signature found on the regulatory
 * database against the array 'keys'. Returns 1 if there exists
 * at least one key in the array such that the signature is valid
 * against that key; 0 otherwise.
 */
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#ifdef USE_OPENSSL
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int reglib_verify_db_signature(uint8_t *db, size_t dblen, size_t siglen)
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{
	RSA *rsa;
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	uint8_t hash[SHA_DIGEST_LENGTH];
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	unsigned int i;
	int ok = 0;
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	DIR *pubkey_dir;
	struct dirent *nextfile;
	FILE *keyfile;
	char filename[PATH_MAX];
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	if (SHA1(db, dblen, hash) != hash) {
		fprintf(stderr, "Failed to calculate SHA1 sum.\n");
		goto out;
	}

	for (i = 0; (i < sizeof(keys)/sizeof(keys[0])) && (!ok); i++) {
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		rsa = RSA_new();
		if (!rsa) {
			fprintf(stderr, "Failed to create RSA key.\n");
			goto out;
		}

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		rsa->e = &keys[i].e;
		rsa->n = &keys[i].n;

		ok = RSA_verify(NID_sha1, hash, SHA_DIGEST_LENGTH,
				db + dblen, siglen, rsa) == 1;

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		rsa->e = NULL;
		rsa->n = NULL;
		RSA_free(rsa);
	}
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	if (!ok && (pubkey_dir = opendir(PUBKEY_DIR))) {
		while (!ok && (nextfile = readdir(pubkey_dir))) {
			snprintf(filename, PATH_MAX, "%s/%s", PUBKEY_DIR,
				nextfile->d_name);
			if ((keyfile = fopen(filename, "rb"))) {
				rsa = PEM_read_RSA_PUBKEY(keyfile,
					NULL, NULL, NULL);
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				if (rsa)
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					ok = RSA_verify(NID_sha1, hash, SHA_DIGEST_LENGTH,
						db + dblen, siglen, rsa) == 1;
				RSA_free(rsa);
				fclose(keyfile);
			}
		}
		closedir(pubkey_dir);
	}
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	if (!ok)
		fprintf(stderr, "Database signature verification failed.\n");

out:
	return ok;
}
#endif /* USE_OPENSSL */
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#ifdef USE_GCRYPT
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int reglib_verify_db_signature(uint8_t *db, size_t dblen, size_t siglen)
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{
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	gcry_mpi_t mpi_e, mpi_n;
	gcry_sexp_t rsa, signature, data;
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	uint8_t hash[20];
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	unsigned int i;
	int ok = 0;

	/* initialise */
	gcry_check_version(NULL);

	/* hash the db */
	gcry_md_hash_buffer(GCRY_MD_SHA1, hash, db, dblen);

	if (gcry_sexp_build(&data, NULL, "(data (flags pkcs1) (hash sha1 %b))",
			    20, hash)) {
		fprintf(stderr, "Failed to build data S-expression.\n");
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		return ok;
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	}

	if (gcry_sexp_build(&signature, NULL, "(sig-val (rsa (s %b)))",
			    siglen, db + dblen)) {
		fprintf(stderr, "Failed to build signature S-expression.\n");
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		gcry_sexp_release(data);
		return ok;
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	}

	for (i = 0; (i < sizeof(keys)/sizeof(keys[0])) && (!ok); i++) {
		if (gcry_mpi_scan(&mpi_e, GCRYMPI_FMT_USG,
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				keys[i].e, keys[i].len_e, NULL) ||
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		    gcry_mpi_scan(&mpi_n, GCRYMPI_FMT_USG,
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				keys[i].n, keys[i].len_n, NULL)) {
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			fprintf(stderr, "Failed to convert numbers.\n");
			goto out;
		}

		if (gcry_sexp_build(&rsa, NULL,
				    "(public-key (rsa (n %m) (e %m)))",
				    mpi_n, mpi_e)) {
			fprintf(stderr, "Failed to build RSA S-expression.\n");
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			gcry_mpi_release(mpi_e);
			gcry_mpi_release(mpi_n);
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			goto out;
		}

		ok = gcry_pk_verify(signature, data, rsa) == 0;
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		gcry_mpi_release(mpi_e);
		gcry_mpi_release(mpi_n);
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		gcry_sexp_release(rsa);
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	}

	if (!ok)
		fprintf(stderr, "Database signature verification failed.\n");

out:
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	gcry_sexp_release(data);
	gcry_sexp_release(signature);
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	return ok;
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}
#endif /* USE_GCRYPT */

#if !defined(USE_OPENSSL) && !defined(USE_GCRYPT)
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int reglib_verify_db_signature(uint8_t *db, size_t dblen, size_t siglen)
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{
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	return 1;
}
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#endif
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const struct reglib_regdb_ctx *reglib_malloc_regdb_ctx(const char *regdb_file)
{
	struct regdb_file_header *header;
	struct reglib_regdb_ctx *ctx;

	ctx = malloc(sizeof(struct reglib_regdb_ctx));
	if (!ctx)
		return NULL;

	memset(ctx, 0, sizeof(struct reglib_regdb_ctx));

	ctx->fd = open(regdb_file, O_RDONLY);

	if (ctx->fd < 0) {
		free(ctx);
		return NULL;
	}

	if (fstat(ctx->fd, &ctx->stat)) {
		close(ctx->fd);
		free(ctx);
		return NULL;
	}

	ctx->real_dblen = ctx->stat.st_size;

	ctx->db = mmap(NULL, ctx->real_dblen, PROT_READ,
		       MAP_PRIVATE, ctx->fd, 0);
	if (ctx->db == MAP_FAILED) {
		close(ctx->fd);
		free(ctx);
		return NULL;
	}

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	ctx->header = reglib_get_file_ptr(ctx->db, ctx->real_dblen,
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					  sizeof(struct regdb_file_header),
					  0);
	header = ctx->header;

	if (ntohl(header->magic) != REGDB_MAGIC)
		goto err_out;

	if (ntohl(header->version) != REGDB_VERSION)
		goto err_out;

	ctx->siglen = ntohl(header->signature_length);

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	if (ctx->siglen > ctx->real_dblen - sizeof(*header))
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		goto err_out;

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	/* The actual dblen does not take into account the signature */
	ctx->dblen = ctx->real_dblen - ctx->siglen;

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	/* verify signature */
	if (!reglib_verify_db_signature(ctx->db, ctx->dblen, ctx->siglen))
		goto err_out;

	ctx->verified = true;
	ctx->num_countries = ntohl(header->reg_country_num);
	ctx->countries = reglib_get_file_ptr(ctx->db,
					     ctx->dblen,
					     sizeof(struct regdb_file_reg_country) * ctx->num_countries,
					     header->reg_country_ptr);
	return ctx;

err_out:
	close(ctx->fd);
	munmap(ctx->db, ctx->real_dblen);
	free(ctx);
	return NULL;
}

void reglib_free_regdb_ctx(const struct reglib_regdb_ctx *regdb_ctx)
{
	struct reglib_regdb_ctx *ctx;

	if (!regdb_ctx)
		return;

	ctx = (struct reglib_regdb_ctx *) regdb_ctx;

	memset(ctx, 0, sizeof(struct reglib_regdb_ctx));
	close(ctx->fd);
	munmap(ctx->db, ctx->real_dblen);
	free(ctx);
}

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static void reg_rule2rd(uint8_t *db, size_t dblen,
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	uint32_t ruleptr, struct ieee80211_reg_rule *rd_reg_rule)
{
	struct regdb_file_reg_rule *rule;
	struct regdb_file_freq_range *freq;
	struct regdb_file_power_rule *power;

	struct ieee80211_freq_range *rd_freq_range = &rd_reg_rule->freq_range;
	struct ieee80211_power_rule *rd_power_rule = &rd_reg_rule->power_rule;

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	rule  = reglib_get_file_ptr(db, dblen, sizeof(*rule), ruleptr);
	freq  = reglib_get_file_ptr(db, dblen, sizeof(*freq), rule->freq_range_ptr);
	power = reglib_get_file_ptr(db, dblen, sizeof(*power), rule->power_rule_ptr);
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	rd_freq_range->start_freq_khz = ntohl(freq->start_freq);
	rd_freq_range->end_freq_khz = ntohl(freq->end_freq);
	rd_freq_range->max_bandwidth_khz = ntohl(freq->max_bandwidth);

	rd_power_rule->max_antenna_gain = ntohl(power->max_antenna_gain);
	rd_power_rule->max_eirp = ntohl(power->max_eirp);

	rd_reg_rule->flags = ntohl(rule->flags);
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	if (rd_reg_rule->flags & RRF_NO_IR_ALL)
		rd_reg_rule->flags |= RRF_NO_IR_ALL;
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}

/* Converts a file regdomain to ieee80211_regdomain, easier to manage */
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const static struct ieee80211_regdomain *
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country2rd(const struct reglib_regdb_ctx *ctx,
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	   struct regdb_file_reg_country *country)
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{
	struct regdb_file_reg_rules_collection *rcoll;
	struct ieee80211_regdomain *rd;
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	unsigned int i, num_rules;
	size_t size_of_rd;
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	rcoll = reglib_get_file_ptr(ctx->db, ctx->dblen, sizeof(*rcoll),
				    country->reg_collection_ptr);
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	num_rules = ntohl(rcoll->reg_rule_num);
	/* re-get pointer with sanity checking for num_rules */
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	rcoll = reglib_get_file_ptr(ctx->db, ctx->dblen,
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				    reglib_array_len(sizeof(*rcoll), num_rules,
						     sizeof(uint32_t)),
				    country->reg_collection_ptr);
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	size_of_rd = reglib_array_len(sizeof(struct ieee80211_regdomain),
				      num_rules,
				      sizeof(struct ieee80211_reg_rule));
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	rd = malloc(size_of_rd);
	if (!rd)
		return NULL;

	memset(rd, 0, size_of_rd);

	rd->alpha2[0] = country->alpha2[0];
	rd->alpha2[1] = country->alpha2[1];
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	rd->dfs_region = country->creqs & 0x3;
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	rd->n_reg_rules = num_rules;

	for (i = 0; i < num_rules; i++) {
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		reg_rule2rd(ctx->db, ctx->dblen, rcoll->reg_rule_ptrs[i],
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			&rd->reg_rules[i]);
	}

	return rd;
}
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const struct ieee80211_regdomain *
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reglib_get_rd_idx(unsigned int idx, const struct reglib_regdb_ctx *ctx)
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{
	struct regdb_file_reg_country *country;

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	if (!ctx)
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		return NULL;

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	if (idx >= ctx->num_countries)
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		return NULL;
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	country = ctx->countries + idx;
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	return country2rd(ctx, country);
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}
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const struct ieee80211_regdomain *
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reglib_get_rd_alpha2(const char *alpha2, const char *file)
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{
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	const struct reglib_regdb_ctx *ctx;
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	const struct ieee80211_regdomain *rd = NULL;
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	struct regdb_file_reg_country *country;
	bool found_country = false;
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	unsigned int i;
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	ctx = reglib_malloc_regdb_ctx(file);
	if (!ctx)
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		return NULL;

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	for (i = 0; i < ctx->num_countries; i++) {
		country = ctx->countries + i;
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		if (memcmp(country->alpha2, alpha2, 2) == 0) {
			found_country = 1;
			break;
		}
	}

	if (!found_country)
		goto out;

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	rd = country2rd(ctx, country);
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	if (!rd)
		goto out;

out:
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	reglib_free_regdb_ctx(ctx);
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	return rd;
}
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/* Sanity check on a regulatory rule */
static int is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
{
	const struct ieee80211_freq_range *freq_range = &rule->freq_range;
	uint32_t freq_diff;

	if (freq_range->start_freq_khz == 0 || freq_range->end_freq_khz == 0)
		return 0;

	if (freq_range->start_freq_khz > freq_range->end_freq_khz)
		return 0;

	freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;

	if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
	    freq_range->max_bandwidth_khz > freq_diff)
		return 0;

	return 1;
}

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int reglib_is_valid_rd(const struct ieee80211_regdomain *rd)
{
	const struct ieee80211_reg_rule *reg_rule = NULL;
	unsigned int i;

	if (!rd->n_reg_rules)
		return 0;

	for (i = 0; i < rd->n_reg_rules; i++) {
		reg_rule = &rd->reg_rules[i];
		if (!is_valid_reg_rule(reg_rule))
		return 0;
	}
	return 1;
}

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static int reg_rules_union(const struct ieee80211_reg_rule *rule1,
			   const struct ieee80211_reg_rule *rule2,
			   struct ieee80211_reg_rule *union_rule)
{
	const struct ieee80211_freq_range *freq_range1, *freq_range2;
	struct ieee80211_freq_range *freq_range;
	const struct ieee80211_power_rule *power_rule1, *power_rule2;
	struct ieee80211_power_rule *power_rule;

	freq_range1 = &rule1->freq_range;
	freq_range2 = &rule2->freq_range;
	freq_range = &union_rule->freq_range;

	power_rule1 = &rule1->power_rule;
	power_rule2 = &rule2->power_rule;
	power_rule = &union_rule->power_rule;


	if (freq_range1->end_freq_khz < freq_range2->start_freq_khz)
		return -EINVAL;
	if (freq_range2->end_freq_khz < freq_range1->start_freq_khz)
		return -EINVAL;

	freq_range->start_freq_khz = reglib_min(freq_range1->start_freq_khz,
					 freq_range2->start_freq_khz);
	freq_range->end_freq_khz = reglib_max(freq_range1->end_freq_khz,
				       freq_range2->end_freq_khz);
	freq_range->max_bandwidth_khz = reglib_max(freq_range1->max_bandwidth_khz,
					    freq_range2->max_bandwidth_khz);

	power_rule->max_eirp = reglib_max(power_rule1->max_eirp,
		power_rule2->max_eirp);
	power_rule->max_antenna_gain = reglib_max(power_rule1->max_antenna_gain,
		power_rule2->max_antenna_gain);

	union_rule->flags = rule1->flags | rule2->flags;

	if (!is_valid_reg_rule(union_rule))
		return -EINVAL;

	return 0;
}

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/*
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 * Helper for reglib_intersect_rds(), this does the real
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 * mathematical intersection fun
 */
static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1,
			       const struct ieee80211_reg_rule *rule2,
			       struct ieee80211_reg_rule *intersected_rule)
{
	const struct ieee80211_freq_range *freq_range1, *freq_range2;
	struct ieee80211_freq_range *freq_range;
	const struct ieee80211_power_rule *power_rule1, *power_rule2;
	struct ieee80211_power_rule *power_rule;
	uint32_t freq_diff;

	freq_range1 = &rule1->freq_range;
	freq_range2 = &rule2->freq_range;
	freq_range = &intersected_rule->freq_range;

	power_rule1 = &rule1->power_rule;
	power_rule2 = &rule2->power_rule;
	power_rule = &intersected_rule->power_rule;

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	freq_range->start_freq_khz = reglib_max(freq_range1->start_freq_khz,
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					 freq_range2->start_freq_khz);
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	freq_range->end_freq_khz = reglib_min(freq_range1->end_freq_khz,
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				       freq_range2->end_freq_khz);
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	freq_range->max_bandwidth_khz = reglib_min(freq_range1->max_bandwidth_khz,
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					    freq_range2->max_bandwidth_khz);

	freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
	if (freq_range->max_bandwidth_khz > freq_diff)
		freq_range->max_bandwidth_khz = freq_diff;

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	power_rule->max_eirp = reglib_min(power_rule1->max_eirp,
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		power_rule2->max_eirp);
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	power_rule->max_antenna_gain = reglib_min(power_rule1->max_antenna_gain,
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		power_rule2->max_antenna_gain);

	intersected_rule->flags = rule1->flags | rule2->flags;

	if (!is_valid_reg_rule(intersected_rule))
		return -EINVAL;

	return 0;
}

/**
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 * reglib_intersect_rds - do the intersection between two regulatory domains
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 * @rd1: first regulatory domain
 * @rd2: second regulatory domain
 *
 * Use this function to get the intersection between two regulatory domains.
 * Once completed we will mark the alpha2 for the rd as intersected, "98",
 * as no one single alpha2 can represent this regulatory domain.
 *
 * Returns a pointer to the regulatory domain structure which will hold the
 * resulting intersection of rules between rd1 and rd2. We will
 * malloc() this structure for you.
 */
struct ieee80211_regdomain *
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reglib_intersect_rds(const struct ieee80211_regdomain *rd1,
		     const struct ieee80211_regdomain *rd2)
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{
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	int r;
	size_t size_of_regd;
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	unsigned int x, y;
	unsigned int num_rules = 0, rule_idx = 0;
	const struct ieee80211_reg_rule *rule1, *rule2;
	struct ieee80211_reg_rule *intersected_rule;
	struct ieee80211_regdomain *rd;
	/* This is just a dummy holder to help us count */
	struct ieee80211_reg_rule irule;

	/* Uses the stack temporarily for counter arithmetic */
	intersected_rule = &irule;

	memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));

	if (!rd1 || !rd2)
		return NULL;

	/* First we get a count of the rules we'll need, then we actually
	 * build them. This is to so we can malloc() and free() a
	 * regdomain once. The reason we use reg_rules_intersect() here
	 * is it will return -EINVAL if the rule computed makes no sense.
	 * All rules that do check out OK are valid. */

	for (x = 0; x < rd1->n_reg_rules; x++) {
		rule1 = &rd1->reg_rules[x];
		for (y = 0; y < rd2->n_reg_rules; y++) {
			rule2 = &rd2->reg_rules[y];
			if (!reg_rules_intersect(rule1, rule2,
					intersected_rule))
				num_rules++;
			memset(intersected_rule, 0,
					sizeof(struct ieee80211_reg_rule));
		}
	}

	if (!num_rules)
		return NULL;

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	size_of_regd = reglib_array_len(sizeof(struct ieee80211_regdomain),
					num_rules + 1,
					sizeof(struct ieee80211_reg_rule));
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	rd = malloc(size_of_regd);
	if (!rd)
		return NULL;

	memset(rd, 0, size_of_regd);

	for (x = 0; x < rd1->n_reg_rules; x++) {
		rule1 = &rd1->reg_rules[x];
		for (y = 0; y < rd2->n_reg_rules; y++) {
			rule2 = &rd2->reg_rules[y];
			/* This time around instead of using the stack lets
			 * write to the target rule directly saving ourselves
			 * a memcpy() */
			intersected_rule = &rd->reg_rules[rule_idx];
			r = reg_rules_intersect(rule1, rule2,
				intersected_rule);
			if (r)
				continue;
			rule_idx++;
		}
	}

	if (rule_idx != num_rules) {
		free(rd);
		return NULL;
	}

	rd->n_reg_rules = num_rules;
	rd->alpha2[0] = '9';
	rd->alpha2[1] = '9';

	return rd;
}
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const struct ieee80211_regdomain *
reglib_intersect_regdb(const struct reglib_regdb_ctx *ctx)
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{
	const struct ieee80211_regdomain *rd;
	struct ieee80211_regdomain *prev_rd_intsct = NULL, *rd_intsct = NULL;
	int intersected = 0;
	unsigned int idx = 0;

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	if (!ctx)
		return NULL;

	reglib_for_each_country(rd, idx, ctx) {
646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
		if (reglib_is_world_regdom((const char *) rd->alpha2)) {
			free((struct ieee80211_regdomain *) rd);
			continue;
		}

		if (!prev_rd_intsct) {
			prev_rd_intsct = (struct ieee80211_regdomain *) rd;
			continue;
		}

		if (rd_intsct) {
			free(prev_rd_intsct);
			prev_rd_intsct = (struct ieee80211_regdomain *) rd_intsct;
		}

		rd_intsct = reglib_intersect_rds(prev_rd_intsct, rd);
		if (!rd_intsct) {
			free(prev_rd_intsct);
			free((struct ieee80211_regdomain *) rd);
			return NULL;
		}

		intersected++;
		free((struct ieee80211_regdomain *) rd);
	}

	if (!idx)
		return NULL;

	if (intersected <= 0) {
		rd_intsct = prev_rd_intsct;
		prev_rd_intsct = NULL;
		if (idx > 1) {
			free(rd_intsct);
			return NULL;
		}
	}

	if (prev_rd_intsct)
		free(prev_rd_intsct);

	return rd_intsct;
}

690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
static const char *dfs_domain_name(enum regdb_dfs_regions region)
{
	switch (region) {
	case REGDB_DFS_UNSET:
		return "DFS-UNSET";
	case REGDB_DFS_FCC:
		return "DFS-FCC";
	case REGDB_DFS_ETSI:
		return "DFS-ETSI";
	case REGDB_DFS_JP:
		return "DFS-JP";
	default:
		return "DFS-invalid";
	}
}

static void print_reg_rule(const struct ieee80211_reg_rule *rule)
{
	const struct ieee80211_freq_range *freq;
	const struct ieee80211_power_rule *power;

	freq  = &rule->freq_range;
	power = &rule->power_rule;

	printf("\t(%.3f - %.3f @ %.3f), ",
	       ((float)(freq->start_freq_khz))/1000.0,
	       ((float)(freq->end_freq_khz))/1000.0,
	       ((float)(freq->max_bandwidth_khz))/1000.0);

	printf("(");

	if (power->max_eirp)
		printf("%.2f)", ((float)(power->max_eirp)/100.0));
	else
		printf("N/A)");

726 727 728 729 730
	if (rule->dfs_cac_ms)
		printf(", (%u)", rule->dfs_cac_ms);
	else
		printf(", (N/A)");

731 732 733 734 735 736 737 738 739 740 741 742 743 744
	if (rule->flags & RRF_NO_OFDM)
		printf(", NO-OFDM");
	if (rule->flags & RRF_NO_CCK)
		printf(", NO-CCK");
	if (rule->flags & RRF_NO_INDOOR)
		printf(", NO-INDOOR");
	if (rule->flags & RRF_NO_OUTDOOR)
		printf(", NO-OUTDOOR");
	if (rule->flags & RRF_DFS)
		printf(", DFS");
	if (rule->flags & RRF_PTP_ONLY)
		printf(", PTP-ONLY");
	if (rule->flags & RRF_PTMP_ONLY)
		printf(", PTMP-ONLY");
745 746
	if (rule->flags & RRF_NO_IR_ALL)
		printf(", NO-IR");
747 748
	if (rule->flags & RRF_AUTO_BW)
		printf(", AUTO-BW");
749 750 751 752 753 754 755 756 757 758 759 760 761

	printf("\n");
}

void reglib_print_regdom(const struct ieee80211_regdomain *rd)
{
	unsigned int i;
	printf("country %.2s: %s\n", rd->alpha2,
	       dfs_domain_name(rd->dfs_region));
	for (i = 0; i < rd->n_reg_rules; i++)
		print_reg_rule(&rd->reg_rules[i]);
	printf("\n");
}
762 763 764

static unsigned int reglib_parse_dfs_region(char *dfs_region)
{
765 766 767 768
	if (!dfs_region)
		return REGDB_DFS_UNSET;

	if (strstr(dfs_region, "DFS-FCC"))
769
		return REGDB_DFS_FCC;
770
	if (strstr(dfs_region, "DFS-ETSI"))
771
		return REGDB_DFS_ETSI;
772
	if (strstr(dfs_region, "DFS-JP"))
773 774 775 776 777 778
		return REGDB_DFS_JP;
	return REGDB_DFS_UNSET;
}

static uint32_t reglib_parse_rule_flag(char *flag_s)
{
779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800
	uint32_t flags = 0;

	if (strstr(flag_s, "NO-OFDM"))
		flags |= RRF_NO_OFDM;
	if (strstr(flag_s, "NO-CCK"))
		flags |= RRF_NO_CCK;
	if (strstr(flag_s, "NO-INDOOR"))
		flags |= RRF_NO_INDOOR;
	if (strstr(flag_s, "NO-OUTDOOR"))
		flags |= RRF_NO_OUTDOOR;
	if (strstr(flag_s, "DFS"))
		flags |= RRF_DFS;
	if (strstr(flag_s, "PTP-ONLY"))
		flags |= RRF_PTP_ONLY;
	if (strstr(flag_s, "PTMP-ONLY"))
		flags |= RRF_PTMP_ONLY;
	if (strstr(flag_s, "NO-IR"))
		flags |= RRF_NO_IR;
	if (strstr(flag_s, "AUTO-BW"))
		flags |= RRF_AUTO_BW;

	return flags;
801 802
}

803
static int reglib_parse_rule(FILE *fp, struct ieee80211_reg_rule *reg_rule)
804
{
805 806 807
	char line[1024];
	char *line_p;
	int hits, r = 0;
808
	float start_freq_khz, end_freq_khz, max_bandwidth_khz, max_eirp;
809
	unsigned int dfs_cac_ms = 0;
810

811 812 813
	memset(line, 0, sizeof(line));
	line_p = fgets(line, sizeof(line), fp);
	if (line_p != line)
814 815
		return -EINVAL;

816 817
	/* First get start, end and bandwidth */
	hits = sscanf(line_p, "\t(%f - %f @ %f),",
818 819
		      &start_freq_khz,
		      &end_freq_khz,
820
		      &max_bandwidth_khz);
821

822
	if (hits != 3)
823 824 825 826 827 828 829 830 831
		return -EINVAL;

	reg_rule->freq_range.start_freq_khz =
		REGLIB_MHZ_TO_KHZ(start_freq_khz);
	reg_rule->freq_range.end_freq_khz =
		REGLIB_MHZ_TO_KHZ(end_freq_khz);
	reg_rule->freq_range.max_bandwidth_khz =
		REGLIB_MHZ_TO_KHZ(max_bandwidth_khz);

832 833 834 835
	/* Next get eirp */
	strsep(&line_p, ",");
	if (!line_p) {
		fprintf(stderr, "not found eirp in line: %s\n", line);
836
		return -EINVAL;
837
	}
838

839 840 841 842 843 844 845 846 847 848 849 850
	if (strstr(line_p, "mW")) {
		hits = sscanf(line_p, " (%f mW)", &max_eirp);
		if (hits != 1)
			return -EINVAL;
		reg_rule->power_rule.max_eirp =
			REGLIB_MW_TO_MBM(max_eirp);
	} else {
		hits = sscanf(line_p, " (%f)", &max_eirp);
		if (hits != 1)
			return -EINVAL;
		reg_rule->power_rule.max_eirp =
			REGLIB_DBM_TO_MBM(max_eirp);
851 852
	}

853 854
	/* Next get optional arguments (flags ...) */
	strsep(&line_p, ",");
855 856 857 858 859 860 861
	if (line_p) {
		/* Check DFS CAC time */
		hits = sscanf(line_p, " (%u)", &dfs_cac_ms);
		if (hits == 1)
			reg_rule->dfs_cac_ms = dfs_cac_ms;

		/* Check flags */
862
		reg_rule->flags = reglib_parse_rule_flag(line_p);
863
	}
864

865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
	return r;
}

static uint32_t
reglib_get_n_rules(FILE *fp, struct ieee80211_reg_rule *reg_rule)
{
	uint32_t n_rules = 0;
	int r;
	bool save_debug = false;

	save_debug = debug;
	debug = false;

	while (1) {
		r = reglib_parse_rule(fp, reg_rule);
		if (r != 0)
			break;
		n_rules++;
	}

	debug = save_debug;

	return n_rules;
}

static int reglib_parse_reg_rule(FILE *fp, struct ieee80211_reg_rule *reg_rule)
{
	int r;

	while (1) {
		r = reglib_parse_rule(fp, reg_rule);
		if (r != 0)
			continue;
		return 0;
	}
}

static struct ieee80211_regdomain *
reglib_parse_rules(FILE *fp, struct ieee80211_regdomain *trd)
{
	struct ieee80211_regdomain *rd;
	struct ieee80211_reg_rule rule;
	struct ieee80211_reg_rule *reg_rule;
	fpos_t pos;
	unsigned int i;
	uint32_t size_of_regd = 0, num_rules = 0;
	int r;

	memset(&rule, 0, sizeof(rule));
	reg_rule = &rule;

	r = fgetpos(fp, &pos);
	if (r != 0) {
		fprintf(stderr, "fgetpos() failed: %s\n",
			strerror(errno));
		return NULL;
	}

	num_rules = reglib_get_n_rules(fp, reg_rule);
	if (!num_rules)
		return NULL;

	size_of_regd = reglib_array_len(sizeof(struct ieee80211_regdomain),
					num_rules + 1,
					sizeof(struct ieee80211_reg_rule));
	rd = malloc(size_of_regd);
	if (!rd)
		return NULL;

	memset(rd, 0, size_of_regd);
	memcpy(rd, trd, sizeof(*trd));

	rd->n_reg_rules = num_rules;

	r = fsetpos(fp, &pos);
	if (r != 0) {
		fprintf(stderr, "fsetpos() failed: %s\n",
			strerror(errno));
		free(rd);
		return NULL;
	}
	for (i = 0; i < num_rules; i++) {
		struct ieee80211_reg_rule *rrule = &rd->reg_rules[i];

		if (reglib_parse_reg_rule(fp, rrule) != 0) {
			fprintf(stderr, "rule parse failed\n");
			free(rd);
			return NULL;
		}
	}
	return rd;
}

static int reglib_parse_country_dfs(char *line, struct ieee80211_regdomain *rd)
{
	char dfs_region_alpha[9];
	char alpha2[2];
	int hits;

964
	memset(rd, 0, sizeof(*rd));
965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993
	memset(alpha2, 0, sizeof(alpha2));
	memset(dfs_region_alpha, 0, sizeof(dfs_region_alpha));

	hits = sscanf(line, "country %2[a-zA-Z0-9]:%*[ ]%s\n",
		      alpha2,
		      dfs_region_alpha);
	if (hits <= 0)
		return -EINVAL;

	rd->alpha2[0] = alpha2[0];
	rd->alpha2[1] = alpha2[1];
	rd->dfs_region = reglib_parse_dfs_region(dfs_region_alpha);

	return 0;
}

struct ieee80211_regdomain *__reglib_parse_country(FILE *fp)
{
	struct ieee80211_regdomain *rd;
	struct ieee80211_regdomain tmp_rd;
	char line[1024];
	char *line_p;
	int r = 0;

	memset(&tmp_rd, 0, sizeof(tmp_rd));
	memset(line, 0, sizeof(line));

	line_p = fgets(line, sizeof(line), fp);

994
	if (line_p != line) {
995
		return NULL;
996
	}
997

998 999
	/* Country */
	r = reglib_parse_country_dfs(line_p, &tmp_rd);
1000 1001 1002 1003 1004
	if (r != 0) {
		fprintf(stderr, "Invalid country line: %s", line);
		return NULL;
	}

1005
	/* Rules */
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
	rd = reglib_parse_rules(fp, &tmp_rd);

	return rd;
}

static int reglib_find_next_country_stream(FILE *fp)
{
	fpos_t prev_pos;
	int r;
	unsigned int i = 0;

	while(1) {
		char line[1024];
		char *line_p;

		r = fgetpos(fp, &prev_pos);
		if (r != 0) {
			fprintf(stderr, "fgetpos() failed: %s\n",
				strerror(errno));
			return r;
		}

		memset(line, 0, sizeof(line));

		line_p = fgets(line, sizeof(line), fp);
		if (line_p == line) {
			if (strspn(line, "\n") == strlen(line)) {
				i++;
				continue;
			}
			if (strncmp(line, "country", 7) != 0)
				continue;
			r = fsetpos(fp, &prev_pos);
			if (r != 0) {
				fprintf(stderr, "fsetpos() failed: %s\n",
					strerror(errno));
				return r;
			}
			return 0;
		} else
			return EOF;
	}
}

struct ieee80211_regdomain *reglib_parse_country(FILE *fp)
{
	int r;

	r = reglib_find_next_country_stream(fp);
	if (r != 0)
		return NULL;
	return __reglib_parse_country(fp);
}

FILE *reglib_create_parse_stream(FILE *f)
{
	unsigned int lines = 0;
	FILE *fp;

	fp = tmpfile();
	if (errno) {
		fprintf(stderr, "%s\n", strerror(errno));
		return NULL;
	}

	while(1) {
		char line[1024];
		char *line_p;

		line_p = fgets(line, sizeof(line), f);
		if (line_p == line) {
			if (strchr(line, '#') == NULL) {
				fputs(line, fp);
				lines++;
			}
			continue;
		} else
			break;
	}

	rewind(fp);
	fflush(fp);

	return fp;
}
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334

/*
 * Just whatever for now, nothing formal, but note that as bands
 * grow we'll want to make this a bit more formal somehow.
 */
static uint32_t reglib_deduce_band(uint32_t start_freq_khz)
{
	uint32_t freq_mhz = REGLIB_KHZ_TO_MHZ(start_freq_khz);

	if (freq_mhz >= 4000)
		return 5;
	if (freq_mhz > 2000 && freq_mhz < 4000)
		return 2;
	if (freq_mhz > 50000)
		return 60;
	return 1234;
}

/*
 * The idea behind a rule key is that if two rule keys share the
 * same key they can be merged together if their frequencies overlap.
 */
static uint64_t reglib_rule_key(struct ieee80211_reg_rule *reg_rule)
{
	struct ieee80211_power_rule *power_rule;
	struct ieee80211_freq_range *freq_range;
	uint32_t band;
	uint32_t key;

	freq_range = &reg_rule->freq_range;
	band = reglib_deduce_band(freq_range->start_freq_khz);

	power_rule = &reg_rule->power_rule;

	key = ((power_rule->max_eirp ^  0) <<  0) ^
	      ((reg_rule->flags      ^  8) <<  8) ^
	      ((band                 ^ 16) << 16);

	return key;
}

struct reglib_optimize_map {
	bool optimized;
	uint32_t key;
};

/* Does the provided rule suffice both of the other two */
static int reglib_opt_rule_fit(struct ieee80211_reg_rule *rule1,
			       struct ieee80211_reg_rule *rule2,
			       struct ieee80211_reg_rule *opt_rule)
{
	struct ieee80211_reg_rule interesected_rule;
	struct ieee80211_reg_rule *int_rule;
	int r;

	memset(&interesected_rule, 0, sizeof(struct ieee80211_reg_rule));
	int_rule = &interesected_rule;

	r = reg_rules_intersect(rule1, opt_rule, int_rule);
	if (r != 0)
		return r;
	r = reg_rules_intersect(rule2, opt_rule, int_rule);
	if (r != 0)
		return r;

	return 0;
}

static int reg_rule_optimize(struct ieee80211_reg_rule *rule1,
			     struct ieee80211_reg_rule *rule2,
			     struct ieee80211_reg_rule *opt_rule)
{
	int r;

	r = reg_rules_union(rule1, rule2, opt_rule);
	if (r != 0)
		return r;
	r = reglib_opt_rule_fit(rule1, rule2, opt_rule);
	if (r != 0)
		return r;

	return 0;
}

/*
 * Here's the math explanation:
 *
 * This takes each pivot frequency on the regulatory domain, computes
 * the union between it each regulatory rule on the regulatory domain
 * sequentially, and after that it tries to verify that the pivot frequency
 * fits on it by computing an intersection between it and the union, if
 * a rule exist as a possible intersection then we know the rule can be
 * subset of the combination of the two frequency ranges (union) computed.
 */
static unsigned int reg_rule_optimize_rd(struct ieee80211_regdomain *rd,
					 unsigned int rule_idx,
					 struct ieee80211_reg_rule *opt_rule,
					 struct reglib_optimize_map *opt_map)
{
	unsigned int i;
	struct ieee80211_reg_rule *rule1;
	struct ieee80211_reg_rule *rule2;

	struct ieee80211_reg_rule tmp_optimized_rule;
	struct ieee80211_reg_rule *tmp_opt_rule;

	struct ieee80211_reg_rule *target_rule;

	unsigned int optimized = 0;
	int r;

	if (rule_idx > rd->n_reg_rules)
		return 0;

	rule1 = &rd->reg_rules[rule_idx];

	memset(&tmp_optimized_rule, 0, sizeof(struct ieee80211_reg_rule));
	tmp_opt_rule = &tmp_optimized_rule;

	memset(opt_rule, 0, sizeof(*opt_rule));

	for (i = 0; i < rd->n_reg_rules; i++) {
		if (rule_idx == i)
			continue;
		rule2 = &rd->reg_rules[i];
		if (opt_map[rule_idx].key != opt_map[i].key)
			continue;

		target_rule = optimized ? opt_rule : rule1;
		r = reg_rule_optimize(target_rule, rule2, tmp_opt_rule);
		if (r != 0)
			continue;
		memcpy(opt_rule, tmp_opt_rule, sizeof(*tmp_opt_rule));

		if (!opt_map[i].optimized) {
			opt_map[i].optimized = true;
			optimized++;
		}
		if (!opt_map[rule_idx].optimized) {
			opt_map[rule_idx].optimized = true;
			optimized++;
		}
	}
	return optimized;
}

struct ieee80211_regdomain *
reglib_optimize_regdom(struct ieee80211_regdomain *rd)
{
	struct ieee80211_regdomain *opt_rd = NULL;
	struct ieee80211_reg_rule *reg_rule;
	struct ieee80211_reg_rule *reg_rule_dst;
	struct ieee80211_reg_rule optimized_reg_rule;
	struct ieee80211_reg_rule *opt_reg_rule;
	struct reglib_optimize_map *opt_map;
	unsigned int i, idx = 0, non_opt = 0, opt = 0;
	size_t num_rules, size_of_regd, size_of_opt_map;
	unsigned int num_opts = 0;

	size_of_opt_map = (rd->n_reg_rules + 2) *
		sizeof(struct reglib_optimize_map);
	opt_map = malloc(size_of_opt_map);
	if (!opt_map)
		return NULL;

	memset(opt_map, 0, size_of_opt_map);
	memset(&optimized_reg_rule, 0, sizeof(struct ieee80211_reg_rule));

	opt_reg_rule = &optimized_reg_rule;

	for (i = 0; i < rd->n_reg_rules; i++) {
		reg_rule = &rd->reg_rules[i];
		opt_map[i].key = reglib_rule_key(reg_rule);
	}
	for (i = 0; i < rd->n_reg_rules; i++) {
		reg_rule = &rd->reg_rules[i];
		if (opt_map[i].optimized)
			continue;
		num_opts = reg_rule_optimize_rd(rd, i, opt_reg_rule, opt_map);
		if (!num_opts)
			non_opt++;
		else
			opt += (num_opts ? 1 : 0);
	}

	num_rules = non_opt + opt;

	if (num_rules > rd->n_reg_rules)
		goto fail_opt_map;

	size_of_regd = reglib_array_len(sizeof(struct ieee80211_regdomain),
					num_rules + 1,
					sizeof(struct ieee80211_reg_rule));

	opt_rd = malloc(size_of_regd);
	if (!opt_rd)
		goto fail_opt_map;
	memset(opt_rd, 0, size_of_regd);

	opt_rd->n_reg_rules = num_rules;
	opt_rd->alpha2[0] = rd->alpha2[0];
	opt_rd->alpha2[1] = rd->alpha2[1];
	opt_rd->dfs_region = rd->dfs_region;

	memset(opt_map, 0, size_of_opt_map);
	memset(&optimized_reg_rule, 0, sizeof(struct ieee80211_reg_rule));

	opt_reg_rule = &optimized_reg_rule;

	for (i = 0; i < rd->n_reg_rules; i++) {
		reg_rule = &rd->reg_rules[i];
		opt_map[i].key = reglib_rule_key(reg_rule);
	}

	for (i = 0; i < rd->n_reg_rules; i++) {
		reg_rule = &rd->reg_rules[i];
		reg_rule_dst = &opt_rd->reg_rules[idx];
		if (opt_map[i].optimized)
			continue;
		num_opts = reg_rule_optimize_rd(rd, i, opt_reg_rule, opt_map);
		if (!num_opts)
			memcpy(reg_rule_dst, reg_rule, sizeof(struct ieee80211_reg_rule));
		else
			memcpy(reg_rule_dst, opt_reg_rule, sizeof(struct ieee80211_reg_rule));
		idx++;
	}

	if (idx != num_rules)
		goto fail;

	for (i = 0; i < opt_rd->n_reg_rules; i++) {
		reg_rule = &opt_rd->reg_rules[i];
		if (!is_valid_reg_rule(reg_rule))
			goto fail;
	}

	free(opt_map);
	return opt_rd;
fail:
	free(opt_rd);
fail_opt_map:
	free(opt_map);
	return NULL;
}