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 int handle_reg_set(struct nl80211_state *state,
  63                           struct nl_cb *cb,
  64                           struct nl_msg *msg,
  65                           int argc, char **argv,
  66                           enum id_input id)
  67 {
  68         char alpha2[3];
  69
  70         if (argc < 1)
  71                 return 1;
  72
  73         if (!is_alpha2(argv[0]) && !is_world_regdom(argv[0])) {
  74                 fprintf(stderr, "not a valid ISO/IEC 3166-1 alpha2\n");
  75                 fprintf(stderr, "Special non-alpha2 usable entries:\n");
  76                 fprintf(stderr, "\t00\tWorld Regulatory domain\n");
  77                 return 2;
  78         }
  79
  80         alpha2[0] = argv[0][0];
  81         alpha2[1] = argv[0][1];
  82         alpha2[2] = '\0';
  83
  84         argc--;
  85         argv++;
  86
  87         if (argc)
  88                 return 1;
  89
  90         NLA_PUT_STRING(msg, NL80211_ATTR_REG_ALPHA2, alpha2);
  91
  92         return 0;
  93  nla_put_failure:
  94         return -ENOBUFS;
  95 }
  96 COMMAND(reg, set, "<ISO/IEC 3166-1 alpha2>",
  97         NL80211_CMD_REQ_SET_REG, 0, CIB_NONE, handle_reg_set,
  98         "Notify the kernel about the current regulatory domain.");
  99
 100 static int print_reg_handler(struct nl_msg *msg, void *arg)
 101
 102 {
 103 #define PARSE_FLAG(nl_flag, string_value)  do { \
 104                 if ((flags & nl_flag)) { \
 105                         printf(", %s", string_value); \
 106                 } \
 107         } while (0)
 108         struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
 109         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 110         char *alpha2;
 111         struct nlattr *nl_rule;
 112         int rem_rule;
 113         static struct nla_policy reg_rule_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
 114                 [NL80211_ATTR_REG_RULE_FLAGS]           = { .type = NLA_U32 },
 115                 [NL80211_ATTR_FREQ_RANGE_START]         = { .type = NLA_U32 },
 116                 [NL80211_ATTR_FREQ_RANGE_END]           = { .type = NLA_U32 },
 117                 [NL80211_ATTR_FREQ_RANGE_MAX_BW]        = { .type = NLA_U32 },
 118                 [NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN]  = { .type = NLA_U32 },
 119                 [NL80211_ATTR_POWER_RULE_MAX_EIRP]      = { .type = NLA_U32 },
 120         };
 121
 122         nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
 123                 genlmsg_attrlen(gnlh, 0), NULL);
 124
 125         if (!tb_msg[NL80211_ATTR_REG_ALPHA2]) {
 126                 printf("No alpha2\n");
 127                 return NL_SKIP;
 128         }
 129
 130         if (!tb_msg[NL80211_ATTR_REG_RULES]) {
 131                 printf("No reg rules\n");
 132                 return NL_SKIP;
 133         }
 134
 135         alpha2 = nla_data(tb_msg[NL80211_ATTR_REG_ALPHA2]);
 136         printf("country %c%c:\n", alpha2[0], alpha2[1]);
 137
 138         nla_for_each_nested(nl_rule, tb_msg[NL80211_ATTR_REG_RULES], rem_rule) {
 139                 struct nlattr *tb_rule[NL80211_FREQUENCY_ATTR_MAX + 1];
 140                 __u32 flags, start_freq_khz, end_freq_khz, max_bw_khz, max_ant_gain_mbi, max_eirp_mbm;
 141
 142                 nla_parse(tb_rule, NL80211_FREQUENCY_ATTR_MAX, nla_data(nl_rule), nla_len(nl_rule), reg_rule_policy);
 143
 144                 flags = nla_get_u32(tb_rule[NL80211_ATTR_REG_RULE_FLAGS]);
 145                 start_freq_khz = nla_get_u32(tb_rule[NL80211_ATTR_FREQ_RANGE_START]);
 146                 end_freq_khz = nla_get_u32(tb_rule[NL80211_ATTR_FREQ_RANGE_END]);
 147                 max_bw_khz = nla_get_u32(tb_rule[NL80211_ATTR_FREQ_RANGE_MAX_BW]);
 148                 max_ant_gain_mbi = nla_get_u32(tb_rule[NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN]);
 149                 max_eirp_mbm = nla_get_u32(tb_rule[NL80211_ATTR_POWER_RULE_MAX_EIRP]);
 150
 151
 152                 printf("\t(%d - %d @ %d), (",
 153                         KHZ_TO_MHZ(start_freq_khz), KHZ_TO_MHZ(end_freq_khz), KHZ_TO_MHZ(max_bw_khz));
 154
 155                 if (MBI_TO_DBI(max_ant_gain_mbi))
 156                         printf("%d", MBI_TO_DBI(max_ant_gain_mbi));
 157                 else
 158                         printf("N/A");
 159
 160                 printf(", %d)", MBM_TO_DBM(max_eirp_mbm));
 161
 162                 if (!flags) {
 163                         printf("\n");
 164                         continue;
 165                 }
 166
 167                 /* Sync this output format to match that of dbparse.py from wireless-regdb.git */
 168                 PARSE_FLAG(NL80211_RRF_NO_OFDM, "NO-OFDM");
 169                 PARSE_FLAG(NL80211_RRF_NO_CCK, "NO-CCK");
 170                 PARSE_FLAG(NL80211_RRF_NO_INDOOR, "NO-INDOOR");
 171                 PARSE_FLAG(NL80211_RRF_NO_OUTDOOR, "NO-OUTDOOR");
 172                 PARSE_FLAG(NL80211_RRF_DFS, "DFS");
 173                 PARSE_FLAG(NL80211_RRF_PTP_ONLY, "PTP-ONLY");
 174                 PARSE_FLAG(NL80211_RRF_PASSIVE_SCAN, "PASSIVE-SCAN");
 175                 PARSE_FLAG(NL80211_RRF_NO_IBSS, "NO-IBSS");
 176
 177                 printf("\n");
 178         }
 179         return NL_OK;
 180 #undef PARSE_FLAG
 181 }
 182
 183 static int handle_reg_get(struct nl80211_state *state,
 184                           struct nl_cb *cb,
 185                           struct nl_msg *msg,
 186                           int argc, char **argv,
 187                           enum id_input id)
 188 {
 189         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_reg_handler, NULL);
 190         return 0;
 191 }
 192 COMMAND(reg, get, NULL, NL80211_CMD_GET_REG, 0, CIB_NONE, handle_reg_get,
 193         "Print out the kernel's current regulatory domain information.");