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