1 #include <net/if.h>
2 #include <errno.h>
3 #include <string.h>
4 #include <stdbool.h>
5
6 #include <netlink/genl/genl.h>
7 #include <netlink/genl/family.h>
8 #include <netlink/genl/ctrl.h>
9 #include <netlink/msg.h>
10 #include <netlink/attr.h>
11
12 #include "nl80211.h"
13 #include "iw.h"
14
15 SECTION(reg);
16
17 #define MHZ_TO_KHZ(freq) ((freq) * 1000)
18 #define KHZ_TO_MHZ(freq) ((freq) / 1000)
19 #define DBI_TO_MBI(gain) ((gain) * 100)
20 #define MBI_TO_DBI(gain) ((gain) / 100)
21 #define DBM_TO_MBM(gain) ((gain) * 100)
22 #define MBM_TO_DBM(gain) ((gain) / 100)
23
isalpha_upper(char letter)24 static bool isalpha_upper(char letter)
25 {
26 if (letter >= 65 && letter <= 90)
27 return true;
28 return false;
29 }
30
is_alpha2(char * alpha2)31 static bool is_alpha2(char *alpha2)
32 {
33 if (isalpha_upper(alpha2[0]) && isalpha_upper(alpha2[1]))
34 return true;
35 return false;
36 }
37
is_world_regdom(char * alpha2)38 static bool is_world_regdom(char *alpha2)
39 {
40 /* ASCII 0 */
41 if (alpha2[0] == 48 && alpha2[1] == 48)
42 return true;
43 return false;
44 }
45
reg_initiator_to_string(__u8 initiator)46 char *reg_initiator_to_string(__u8 initiator)
47 {
48 switch (initiator) {
49 case NL80211_REGDOM_SET_BY_CORE:
50 return "the wireless core upon initialization";
51 case NL80211_REGDOM_SET_BY_USER:
52 return "a user";
53 case NL80211_REGDOM_SET_BY_DRIVER:
54 return "a driver";
55 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
56 return "a country IE";
57 default:
58 return "BUG";
59 }
60 }
61
dfs_domain_name(enum nl80211_dfs_regions region)62 static const char *dfs_domain_name(enum nl80211_dfs_regions region)
63 {
64 switch (region) {
65 case NL80211_DFS_UNSET:
66 return "DFS-UNSET";
67 case NL80211_DFS_FCC:
68 return "DFS-FCC";
69 case NL80211_DFS_ETSI:
70 return "DFS-ETSI";
71 case NL80211_DFS_JP:
72 return "DFS-JP";
73 default:
74 return "DFS-invalid";
75 }
76 }
77
handle_reg_set(struct nl80211_state * state,struct nl_cb * cb,struct nl_msg * msg,int argc,char ** argv,enum id_input id)78 static int handle_reg_set(struct nl80211_state *state,
79 struct nl_cb *cb,
80 struct nl_msg *msg,
81 int argc, char **argv,
82 enum id_input id)
83 {
84 char alpha2[3];
85
86 if (argc < 1)
87 return 1;
88
89 if (!is_alpha2(argv[0]) && !is_world_regdom(argv[0])) {
90 fprintf(stderr, "not a valid ISO/IEC 3166-1 alpha2\n");
91 fprintf(stderr, "Special non-alpha2 usable entries:\n");
92 fprintf(stderr, "\t00\tWorld Regulatory domain\n");
93 return 2;
94 }
95
96 alpha2[0] = argv[0][0];
97 alpha2[1] = argv[0][1];
98 alpha2[2] = '\0';
99
100 argc--;
101 argv++;
102
103 if (argc)
104 return 1;
105
106 NLA_PUT_STRING(msg, NL80211_ATTR_REG_ALPHA2, alpha2);
107
108 return 0;
109 nla_put_failure:
110 return -ENOBUFS;
111 }
112 COMMAND(reg, set, "<ISO/IEC 3166-1 alpha2>",
113 NL80211_CMD_REQ_SET_REG, 0, CIB_NONE, handle_reg_set,
114 "Notify the kernel about the current regulatory domain.");
115
print_reg_handler(struct nl_msg * msg,void * arg)116 static int print_reg_handler(struct nl_msg *msg, void *arg)
117 {
118 #define PARSE_FLAG(nl_flag, string_value) do { \
119 if ((flags & nl_flag)) { \
120 printf(", %s", string_value); \
121 } \
122 } while (0)
123 struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
124 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
125 char *alpha2;
126 struct nlattr *nl_rule;
127 int rem_rule;
128 enum nl80211_dfs_regions dfs_domain;
129 static struct nla_policy reg_rule_policy[NL80211_REG_RULE_ATTR_MAX + 1] = {
130 [NL80211_ATTR_REG_RULE_FLAGS] = { .type = NLA_U32 },
131 [NL80211_ATTR_FREQ_RANGE_START] = { .type = NLA_U32 },
132 [NL80211_ATTR_FREQ_RANGE_END] = { .type = NLA_U32 },
133 [NL80211_ATTR_FREQ_RANGE_MAX_BW] = { .type = NLA_U32 },
134 [NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN] = { .type = NLA_U32 },
135 [NL80211_ATTR_POWER_RULE_MAX_EIRP] = { .type = NLA_U32 },
136 [NL80211_ATTR_DFS_CAC_TIME] = { .type = NLA_U32 },
137 };
138
139 nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
140 genlmsg_attrlen(gnlh, 0), NULL);
141
142 if (!tb_msg[NL80211_ATTR_REG_ALPHA2]) {
143 printf("No alpha2\n");
144 return NL_SKIP;
145 }
146
147 if (!tb_msg[NL80211_ATTR_REG_RULES]) {
148 printf("No reg rules\n");
149 return NL_SKIP;
150 }
151
152 if (tb_msg[NL80211_ATTR_WIPHY])
153 printf("phy#%d%s\n", nla_get_u32(tb_msg[NL80211_ATTR_WIPHY]),
154 tb_msg[NL80211_ATTR_WIPHY_SELF_MANAGED_REG] ?
155 " (self-managed)" : "");
156 else
157 printf("global\n");
158
159 if (tb_msg[NL80211_ATTR_DFS_REGION])
160 dfs_domain = nla_get_u8(tb_msg[NL80211_ATTR_DFS_REGION]);
161 else
162 dfs_domain = NL80211_DFS_UNSET;
163
164 alpha2 = nla_data(tb_msg[NL80211_ATTR_REG_ALPHA2]);
165 printf("country %c%c: %s\n", alpha2[0], alpha2[1], dfs_domain_name(dfs_domain));
166
167 nla_for_each_nested(nl_rule, tb_msg[NL80211_ATTR_REG_RULES], rem_rule) {
168 struct nlattr *tb_rule[NL80211_REG_RULE_ATTR_MAX + 1];
169 __u32 flags, start_freq_khz, end_freq_khz, max_bw_khz, max_ant_gain_mbi, max_eirp_mbm;
170
171 nla_parse(tb_rule, NL80211_REG_RULE_ATTR_MAX, nla_data(nl_rule), nla_len(nl_rule), reg_rule_policy);
172
173 flags = nla_get_u32(tb_rule[NL80211_ATTR_REG_RULE_FLAGS]);
174 start_freq_khz = nla_get_u32(tb_rule[NL80211_ATTR_FREQ_RANGE_START]);
175 end_freq_khz = nla_get_u32(tb_rule[NL80211_ATTR_FREQ_RANGE_END]);
176 max_bw_khz = nla_get_u32(tb_rule[NL80211_ATTR_FREQ_RANGE_MAX_BW]);
177 max_ant_gain_mbi = nla_get_u32(tb_rule[NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN]);
178 max_eirp_mbm = nla_get_u32(tb_rule[NL80211_ATTR_POWER_RULE_MAX_EIRP]);
179
180
181 printf("\t(%d - %d @ %d), (",
182 KHZ_TO_MHZ(start_freq_khz), KHZ_TO_MHZ(end_freq_khz), KHZ_TO_MHZ(max_bw_khz));
183
184 if (MBI_TO_DBI(max_ant_gain_mbi))
185 printf("%d", MBI_TO_DBI(max_ant_gain_mbi));
186 else
187 printf("N/A");
188
189 printf(", %d)", MBM_TO_DBM(max_eirp_mbm));
190
191 if ((flags & NL80211_RRF_DFS) && tb_rule[NL80211_ATTR_DFS_CAC_TIME])
192 printf(", (%u ms)", nla_get_u32(tb_rule[NL80211_ATTR_DFS_CAC_TIME]));
193 else
194 printf(", (N/A)");
195
196 if (!flags) {
197 printf("\n");
198 continue;
199 }
200
201 /* Sync this output format to match that of dbparse.py from wireless-regdb.git */
202 PARSE_FLAG(NL80211_RRF_NO_OFDM, "NO-OFDM");
203 PARSE_FLAG(NL80211_RRF_NO_CCK, "NO-CCK");
204 PARSE_FLAG(NL80211_RRF_NO_INDOOR, "NO-INDOOR");
205 PARSE_FLAG(NL80211_RRF_NO_OUTDOOR, "NO-OUTDOOR");
206 PARSE_FLAG(NL80211_RRF_DFS, "DFS");
207 PARSE_FLAG(NL80211_RRF_PTP_ONLY, "PTP-ONLY");
208 PARSE_FLAG(NL80211_RRF_AUTO_BW, "AUTO-BW");
209 PARSE_FLAG(NL80211_RRF_GO_CONCURRENT, "GO-CONCURRENT");
210 PARSE_FLAG(NL80211_RRF_NO_HT40MINUS, "NO-HT40MINUS");
211 PARSE_FLAG(NL80211_RRF_NO_HT40PLUS, "NO-HT40PLUS");
212 PARSE_FLAG(NL80211_RRF_NO_80MHZ, "NO-80MHZ");
213 PARSE_FLAG(NL80211_RRF_NO_160MHZ, "NO-160MHZ");
214
215 /* Kernels that support NO_IR always turn on both flags */
216 if ((flags & NL80211_RRF_NO_IR) && (flags & __NL80211_RRF_NO_IBSS)) {
217 printf(", NO-IR");
218 } else {
219 PARSE_FLAG(NL80211_RRF_PASSIVE_SCAN, "PASSIVE-SCAN");
220 PARSE_FLAG(__NL80211_RRF_NO_IBSS, "NO-IBSS");
221 }
222
223 printf("\n");
224 }
225
226 printf("\n");
227 return NL_SKIP;
228 #undef PARSE_FLAG
229 }
230
handle_reg_dump(struct nl80211_state * state,struct nl_cb * cb,struct nl_msg * msg,int argc,char ** argv,enum id_input id)231 static int handle_reg_dump(struct nl80211_state *state,
232 struct nl_cb *cb,
233 struct nl_msg *msg,
234 int argc, char **argv,
235 enum id_input id)
236 {
237 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_reg_handler, NULL);
238 return 0;
239 }
240
handle_reg_get(struct nl80211_state * state,struct nl_cb * cb,struct nl_msg * msg,int argc,char ** argv,enum id_input id)241 static int handle_reg_get(struct nl80211_state *state,
242 struct nl_cb *cb,
243 struct nl_msg *msg,
244 int argc, char **argv,
245 enum id_input id)
246 {
247 char *dump_args[] = { "reg", "dump" };
248 int err;
249
250 err = handle_cmd(state, CIB_NONE, 2, dump_args);
251 /* dump might fail since it's not supported on older kernels */
252 if (err == -EOPNOTSUPP) {
253 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_reg_handler,
254 NULL);
255 return 0;
256 }
257
258 return err;
259 }
260 COMMAND(reg, get, NULL, NL80211_CMD_GET_REG, 0, CIB_NONE, handle_reg_get,
261 "Print out the kernel's current regulatory domain information.");
262 COMMAND(reg, get, NULL, NL80211_CMD_GET_REG, 0, CIB_PHY, handle_reg_get,
263 "Print out the devices' current regulatory domain information.");
264 HIDDEN(reg, dump, NULL, NL80211_CMD_GET_REG, NLM_F_DUMP, CIB_NONE,
265 handle_reg_dump);
266