reg.c

   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
  24 static bool isalpha_upper(char letter)
  25 {
  26         if (letter >= 65 && letter <= 90)
  27                 return true;
  28         return false;
  29 }
  30
  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
  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
  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
  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
  78 static int handle_reg_set(struct nl80211_state *state,
  79                           struct nl_msg *msg,
  80                           int argc, char **argv,
  81                           enum id_input id)
  82 {
  83         char alpha2[3];
  84
  85         if (argc < 1)
  86                 return 1;
  87
  88         if (!is_alpha2(argv[0]) && !is_world_regdom(argv[0])) {
  89                 fprintf(stderr, "not a valid ISO/IEC 3166-1 alpha2\n");
  90                 fprintf(stderr, "Special non-alpha2 usable entries:\n");
  91                 fprintf(stderr, "\t00\tWorld Regulatory domain\n");
  92                 return 2;
  93         }
  94
  95         alpha2[0] = argv[0][0];
  96         alpha2[1] = argv[0][1];
  97         alpha2[2] = '\0';
  98
  99         argc--;
 100         argv++;
 101
 102         if (argc)
 103                 return 1;
 104
 105         NLA_PUT_STRING(msg, NL80211_ATTR_REG_ALPHA2, alpha2);
 106
 107         return 0;
 108  nla_put_failure:
 109         return -ENOBUFS;
 110 }
 111 COMMAND(reg, set, "<ISO/IEC 3166-1 alpha2>",
 112         NL80211_CMD_REQ_SET_REG, 0, CIB_NONE, handle_reg_set,
 113         "Notify the kernel about the current regulatory domain.");
 114
 115 static int print_reg_handler(struct nl_msg *msg, void *arg)
 116 {
 117 #define PARSE_FLAG(nl_flag, string_value)  do { \
 118                 if ((flags & nl_flag)) { \
 119                         printf(", %s", string_value); \
 120                 } \
 121         } while (0)
 122         struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
 123         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 124         char *alpha2;
 125         struct nlattr *nl_rule;
 126         int rem_rule;
 127         enum nl80211_dfs_regions dfs_domain;
 128         static struct nla_policy reg_rule_policy[NL80211_REG_RULE_ATTR_MAX + 1] = {
 129                 [NL80211_ATTR_REG_RULE_FLAGS]           = { .type = NLA_U32 },
 130                 [NL80211_ATTR_FREQ_RANGE_START]         = { .type = NLA_U32 },
 131                 [NL80211_ATTR_FREQ_RANGE_END]           = { .type = NLA_U32 },
 132                 [NL80211_ATTR_FREQ_RANGE_MAX_BW]        = { .type = NLA_U32 },
 133                 [NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN]  = { .type = NLA_U32 },
 134                 [NL80211_ATTR_POWER_RULE_MAX_EIRP]      = { .type = NLA_U32 },
 135                 [NL80211_ATTR_DFS_CAC_TIME]             = { .type = NLA_U32 },
 136         };
 137
 138         nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 139                 genlmsg_attrlen(gnlh, 0), NULL);
 140
 141         if (!tb_msg[NL80211_ATTR_REG_ALPHA2]) {
 142                 printf("No alpha2\n");
 143                 return NL_SKIP;
 144         }
 145
 146         if (!tb_msg[NL80211_ATTR_REG_RULES]) {
 147                 printf("No reg rules\n");
 148                 return NL_SKIP;
 149         }
 150
 151         if (tb_msg[NL80211_ATTR_WIPHY])
 152                 printf("phy#%d%s\n", nla_get_u32(tb_msg[NL80211_ATTR_WIPHY]),
 153                        tb_msg[NL80211_ATTR_WIPHY_SELF_MANAGED_REG] ?
 154                        " (self-managed)" : "");
 155         else
 156                 printf("global\n");
 157
 158         if (tb_msg[NL80211_ATTR_DFS_REGION])
 159                 dfs_domain = nla_get_u8(tb_msg[NL80211_ATTR_DFS_REGION]);
 160         else
 161                 dfs_domain = NL80211_DFS_UNSET;
 162
 163         alpha2 = nla_data(tb_msg[NL80211_ATTR_REG_ALPHA2]);
 164         printf("country %c%c: %s\n", alpha2[0], alpha2[1], dfs_domain_name(dfs_domain));
 165
 166         nla_for_each_nested(nl_rule, tb_msg[NL80211_ATTR_REG_RULES], rem_rule) {
 167                 struct nlattr *tb_rule[NL80211_REG_RULE_ATTR_MAX + 1];
 168                 __u32 flags, start_freq_khz, end_freq_khz, max_bw_khz, max_ant_gain_mbi, max_eirp_mbm;
 169
 170                 nla_parse(tb_rule, NL80211_REG_RULE_ATTR_MAX, nla_data(nl_rule), nla_len(nl_rule), reg_rule_policy);
 171
 172                 flags = nla_get_u32(tb_rule[NL80211_ATTR_REG_RULE_FLAGS]);
 173                 start_freq_khz = nla_get_u32(tb_rule[NL80211_ATTR_FREQ_RANGE_START]);
 174                 end_freq_khz = nla_get_u32(tb_rule[NL80211_ATTR_FREQ_RANGE_END]);
 175                 max_bw_khz = nla_get_u32(tb_rule[NL80211_ATTR_FREQ_RANGE_MAX_BW]);
 176                 max_ant_gain_mbi = nla_get_u32(tb_rule[NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN]);
 177                 max_eirp_mbm = nla_get_u32(tb_rule[NL80211_ATTR_POWER_RULE_MAX_EIRP]);
 178
 179
 180                 printf("\t(%d - %d @ %d), (",
 181                         KHZ_TO_MHZ(start_freq_khz), KHZ_TO_MHZ(end_freq_khz), KHZ_TO_MHZ(max_bw_khz));
 182
 183                 if (MBI_TO_DBI(max_ant_gain_mbi))
 184                         printf("%d", MBI_TO_DBI(max_ant_gain_mbi));
 185                 else
 186                         printf("N/A");
 187
 188                 printf(", %d)", MBM_TO_DBM(max_eirp_mbm));
 189
 190                 if ((flags & NL80211_RRF_DFS) && tb_rule[NL80211_ATTR_DFS_CAC_TIME])
 191                         printf(", (%u ms)", nla_get_u32(tb_rule[NL80211_ATTR_DFS_CAC_TIME]));
 192                 else
 193                         printf(", (N/A)");
 194
 195                 if (!flags) {
 196                         printf("\n");
 197                         continue;
 198                 }
 199
 200                 /* Sync this output format to match that of dbparse.py from wireless-regdb.git */
 201                 PARSE_FLAG(NL80211_RRF_NO_OFDM, "NO-OFDM");
 202                 PARSE_FLAG(NL80211_RRF_NO_CCK, "NO-CCK");
 203                 PARSE_FLAG(NL80211_RRF_NO_INDOOR, "NO-INDOOR");
 204                 PARSE_FLAG(NL80211_RRF_NO_OUTDOOR, "NO-OUTDOOR");
 205                 PARSE_FLAG(NL80211_RRF_DFS, "DFS");
 206                 PARSE_FLAG(NL80211_RRF_PTP_ONLY, "PTP-ONLY");
 207                 PARSE_FLAG(NL80211_RRF_AUTO_BW, "AUTO-BW");
 208                 PARSE_FLAG(NL80211_RRF_IR_CONCURRENT, "IR-CONCURRENT");
 209                 PARSE_FLAG(NL80211_RRF_NO_HT40MINUS, "NO-HT40MINUS");
 210                 PARSE_FLAG(NL80211_RRF_NO_HT40PLUS, "NO-HT40PLUS");
 211                 PARSE_FLAG(NL80211_RRF_NO_80MHZ, "NO-80MHZ");
 212                 PARSE_FLAG(NL80211_RRF_NO_160MHZ, "NO-160MHZ");
 213
 214                 /* Kernels that support NO_IR always turn on both flags */
 215                 if ((flags & NL80211_RRF_NO_IR) && (flags & __NL80211_RRF_NO_IBSS)) {
 216                         printf(", NO-IR");
 217                 } else {
 218                         PARSE_FLAG(NL80211_RRF_PASSIVE_SCAN, "PASSIVE-SCAN");
 219                         PARSE_FLAG(__NL80211_RRF_NO_IBSS, "NO-IBSS");
 220                 }
 221
 222                 printf("\n");
 223         }
 224
 225         printf("\n");
 226         return NL_SKIP;
 227 #undef PARSE_FLAG
 228 }
 229
 230 static int handle_reg_dump(struct nl80211_state *state,
 231                            struct nl_msg *msg,
 232                            int argc, char **argv,
 233                            enum id_input id)
 234 {
 235         register_handler(print_reg_handler, NULL);
 236         return 0;
 237 }
 238
 239 static int handle_reg_get(struct nl80211_state *state,
 240                           struct nl_msg *msg,
 241                           int argc, char **argv,
 242                           enum id_input id)
 243 {
 244         char *dump_args[] = { "reg", "dump" };
 245         int err;
 246
 247         err = handle_cmd(state, CIB_NONE, 2, dump_args);
 248         /* dump might fail since it's not supported on older kernels */
 249         if (err == -EOPNOTSUPP) {
 250                 register_handler(print_reg_handler,
 251                           NULL);
 252                 return 0;
 253         }
 254
 255         return err;
 256 }
 257 COMMAND(reg, get, NULL, NL80211_CMD_GET_REG, 0, CIB_NONE, handle_reg_get,
 258         "Print out the kernel's current regulatory domain information.");
 259 COMMAND(reg, get, NULL, NL80211_CMD_GET_REG, 0, CIB_PHY, handle_reg_get,
 260         "Print out the devices' current regulatory domain information.");
 261 HIDDEN(reg, dump, NULL, NL80211_CMD_GET_REG, NLM_F_DUMP, CIB_NONE,
 262        handle_reg_dump);