survey.c

   1 #include <net/if.h>
   2
   3 #include <netlink/genl/genl.h>
   4 #include <netlink/genl/family.h>
   5 #include <netlink/genl/ctrl.h>
   6 #include <netlink/msg.h>
   7 #include <netlink/attr.h>
   8
   9 #include "nl80211.h"
  10 #include "iw.h"
  11
  12 SECTION(survey);
  13
  14 static int print_survey_handler(struct nl_msg *msg, void *arg)
  15 {
  16         struct nlattr *tb[NL80211_ATTR_MAX + 1];
  17         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
  18         struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
  19         char dev[20];
  20
  21         static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
  22                 [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
  23                 [NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
  24         };
  25
  26         nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
  27                   genlmsg_attrlen(gnlh, 0), NULL);
  28
  29         if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), dev);
  30         printf("Survey data from %s\n", dev);
  31
  32         if (!tb[NL80211_ATTR_SURVEY_INFO]) {
  33                 fprintf(stderr, "survey data missing!\n");
  34                 return NL_SKIP;
  35         }
  36
  37         if (nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
  38                              tb[NL80211_ATTR_SURVEY_INFO],
  39                              survey_policy)) {
  40                 fprintf(stderr, "failed to parse nested attributes!\n");
  41                 return NL_SKIP;
  42         }
  43
  44         if (sinfo[NL80211_SURVEY_INFO_FREQUENCY])
  45                 printf("\tfrequency:\t\t\t%u MHz%s\n",
  46                         nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]),
  47                         sinfo[NL80211_SURVEY_INFO_IN_USE] ? " [in use]" : "");
  48         if (sinfo[NL80211_SURVEY_INFO_NOISE])
  49                 printf("\tnoise:\t\t\t\t%d dBm\n",
  50                         (int8_t)nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]));
  51         if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME])
  52                 printf("\tchannel active time:\t\t%llu ms\n",
  53                         (unsigned long long)nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME]));
  54         if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_BUSY])
  55                 printf("\tchannel busy time:\t\t%llu ms\n",
  56                         (unsigned long long)nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_BUSY]));
  57         if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_EXT_BUSY])
  58                 printf("\textension channel busy time:\t%llu ms\n",
  59                         (unsigned long long)nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_EXT_BUSY]));
  60         if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_RX])
  61                 printf("\tchannel receive time:\t\t%llu ms\n",
  62                         (unsigned long long)nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_RX]));
  63         if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_TX])
  64                 printf("\tchannel transmit time:\t\t%llu ms\n",
  65                         (unsigned long long)nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_TX]));
  66         return NL_SKIP;
  67 }
  68
  69 static int handle_survey_dump(struct nl80211_state *state,
  70                               struct nl_msg *msg,
  71                               int argc, char **argv,
  72                               enum id_input id)
  73 {
  74         register_handler(print_survey_handler, NULL);
  75         return 0;
  76 }
  77 COMMAND(survey, dump, NULL,
  78         NL80211_CMD_GET_SURVEY, NLM_F_DUMP, CIB_NETDEV, handle_survey_dump,
  79         "List all gathered channel survey data");
  80