2 * Central Regulatory Domain Agent for Linux
4 * Userspace helper which sends regulatory domains to Linux via nl80211
12 #include <arpa/inet.h>
14 #include <netlink/genl/genl.h>
15 #include <netlink/genl/family.h>
16 #include <netlink/genl/ctrl.h>
17 #include <netlink/msg.h>
18 #include <netlink/attr.h>
24 struct nl80211_state {
25 struct nl_handle *nl_handle;
26 struct nl_cache *nl_cache;
27 struct genl_family *nl80211;
30 static int nl80211_init(struct nl80211_state *state)
34 state->nl_handle = nl_handle_alloc();
35 if (!state->nl_handle) {
36 fprintf(stderr, "Failed to allocate netlink handle.\n");
40 if (genl_connect(state->nl_handle)) {
41 fprintf(stderr, "Failed to connect to generic netlink.\n");
43 goto out_handle_destroy;
46 state->nl_cache = genl_ctrl_alloc_cache(state->nl_handle);
47 if (!state->nl_cache) {
48 fprintf(stderr, "Failed to allocate generic netlink cache.\n");
50 goto out_handle_destroy;
53 state->nl80211 = genl_ctrl_search_by_name(state->nl_cache, "nl80211");
54 if (!state->nl80211) {
55 fprintf(stderr, "nl80211 not found.\n");
63 nl_cache_free(state->nl_cache);
65 nl_handle_destroy(state->nl_handle);
69 static void nl80211_cleanup(struct nl80211_state *state)
71 genl_family_put(state->nl80211);
72 nl_cache_free(state->nl_cache);
73 nl_handle_destroy(state->nl_handle);
76 static int reg_handler(struct nl_msg __attribute__((unused)) *msg,
77 void __attribute__((unused)) *arg)
82 static int wait_handler(struct nl_msg __attribute__((unused)) *msg, void *arg)
89 static int error_handler(struct sockaddr_nl __attribute__((unused)) *nla,
91 void __attribute__((unused)) *arg)
93 fprintf(stderr, "nl80211 error %d\n", err->error);
97 static int put_reg_rule(__u8 *db, int dblen, __be32 ruleptr, struct nl_msg *msg)
99 struct regdb_file_reg_rule *rule;
100 struct regdb_file_freq_range *freq;
101 struct regdb_file_power_rule *power;
103 rule = crda_get_file_ptr(db, dblen, sizeof(*rule), ruleptr);
104 freq = crda_get_file_ptr(db, dblen, sizeof(*freq), rule->freq_range_ptr);
105 power = crda_get_file_ptr(db, dblen, sizeof(*power), rule->power_rule_ptr);
107 NLA_PUT_U32(msg, NL80211_ATTR_REG_RULE_FLAGS, ntohl(rule->flags));
108 NLA_PUT_U32(msg, NL80211_ATTR_FREQ_RANGE_START, ntohl(freq->start_freq));
109 NLA_PUT_U32(msg, NL80211_ATTR_FREQ_RANGE_END, ntohl(freq->end_freq));
110 NLA_PUT_U32(msg, NL80211_ATTR_FREQ_RANGE_MAX_BW, ntohl(freq->max_bandwidth));
111 NLA_PUT_U32(msg, NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN, ntohl(power->max_antenna_gain));
112 NLA_PUT_U32(msg, NL80211_ATTR_POWER_RULE_MAX_EIRP, ntohl(power->max_eirp));
120 int main(int argc, char **argv)
125 struct regdb_file_header *header;
126 struct regdb_file_reg_country *countries;
127 int dblen, siglen, num_countries, i, j, r;
130 struct nl80211_state nlstate;
131 struct nl_cb *cb = NULL;
133 int found_country = 0;
136 struct regdb_file_reg_rules_collection *rcoll;
137 struct regdb_file_reg_country *country;
138 struct nlattr *nl_reg_rules;
141 const char regdb[] = "/usr/lib/crda/regulatory.bin";
144 fprintf(stderr, "Usage: %s\n", argv[0]);
148 env_country = getenv("COUNTRY");
150 fprintf(stderr, "COUNTRY environment variable not set.\n");
154 if (!is_valid_regdom(env_country)) {
155 fprintf(stderr, "COUNTRY environment variable must be an "
156 "ISO ISO 3166-1-alpha-2 (uppercase) or 00\n");
160 memcpy(alpha2, env_country, 2);
162 fd = open(regdb, O_RDONLY);
164 perror("failed to open db file");
168 if (fstat(fd, &stat)) {
169 perror("failed to fstat db file");
173 dblen = stat.st_size;
175 db = mmap(NULL, dblen, PROT_READ, MAP_PRIVATE, fd, 0);
176 if (db == MAP_FAILED) {
177 perror("failed to mmap db file");
181 /* db file starts with a struct regdb_file_header */
182 header = crda_get_file_ptr(db, dblen, sizeof(*header), 0);
184 if (ntohl(header->magic) != REGDB_MAGIC) {
185 fprintf(stderr, "Invalid database magic\n");
189 if (ntohl(header->version) != REGDB_VERSION) {
190 fprintf(stderr, "Invalid database version\n");
194 siglen = ntohl(header->signature_length);
195 /* adjust dblen so later sanity checks don't run into the signature */
198 if (dblen <= (int)sizeof(*header)) {
199 fprintf(stderr, "Invalid signature length %d\n", siglen);
203 /* verify signature */
204 if (!crda_verify_db_signature(db, dblen, siglen))
207 num_countries = ntohl(header->reg_country_num);
208 countries = crda_get_file_ptr(db, dblen,
209 sizeof(struct regdb_file_reg_country) * num_countries,
210 header->reg_country_ptr);
212 for (i = 0; i < num_countries; i++) {
213 country = countries + i;
214 if (memcmp(country->alpha2, alpha2, 2) == 0) {
220 if (!found_country) {
221 fprintf(stderr, "No country match in regulatory database.\n");
225 r = nl80211_init(&nlstate);
231 fprintf(stderr, "Failed to allocate netlink message.\n");
236 genlmsg_put(msg, 0, 0, genl_family_get_id(nlstate.nl80211), 0,
237 0, NL80211_CMD_SET_REG, 0);
239 rcoll = crda_get_file_ptr(db, dblen, sizeof(*rcoll),
240 country->reg_collection_ptr);
241 num_rules = ntohl(rcoll->reg_rule_num);
242 /* re-get pointer with sanity checking for num_rules */
243 rcoll = crda_get_file_ptr(db, dblen,
244 sizeof(*rcoll) + num_rules * sizeof(__be32),
245 country->reg_collection_ptr);
247 NLA_PUT_STRING(msg, NL80211_ATTR_REG_ALPHA2, (char *) country->alpha2);
249 nl_reg_rules = nla_nest_start(msg, NL80211_ATTR_REG_RULES);
252 goto nla_put_failure;
255 for (j = 0; j < num_rules; j++) {
256 struct nlattr *nl_reg_rule;
257 nl_reg_rule = nla_nest_start(msg, i);
259 goto nla_put_failure;
261 r = put_reg_rule(db, dblen, rcoll->reg_rule_ptrs[j], msg);
263 goto nla_put_failure;
265 nla_nest_end(msg, nl_reg_rule);
268 nla_nest_end(msg, nl_reg_rules);
270 cb = nl_cb_alloc(NL_CB_CUSTOM);
274 r = nl_send_auto_complete(nlstate.nl_handle, msg);
277 fprintf(stderr, "Failed to send regulatory request: %d\n", r);
281 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, reg_handler, NULL);
282 nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, wait_handler, &finished);
283 nl_cb_err(cb, NL_CB_CUSTOM, error_handler, NULL);
286 r = nl_wait_for_ack(nlstate.nl_handle);
288 fprintf(stderr, "Failed to set regulatory domain: "
299 nl80211_cleanup(&nlstate);