nexmon – Rev 1

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#include <net/if.h>
#include <errno.h>
#include <string.h>

#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <netlink/msg.h>
#include <netlink/attr.h>

#include "nl80211.h"
#include "iw.h"

SECTION(survey);

static int print_survey_handler(struct nl_msg *msg, void *arg)
{
        struct nlattr *tb[NL80211_ATTR_MAX + 1];
        struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
        struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
        char dev[20];

        static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
                [NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
                [NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
        };

        nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
                  genlmsg_attrlen(gnlh, 0), NULL);

        if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), dev);
        printf("Survey data from %s\n", dev);

        if (!tb[NL80211_ATTR_SURVEY_INFO]) {
                fprintf(stderr, "survey data missing!\n");
                return NL_SKIP;
        }

        if (nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
                             tb[NL80211_ATTR_SURVEY_INFO],
                             survey_policy)) {
                fprintf(stderr, "failed to parse nested attributes!\n");
                return NL_SKIP;
        }

        if (sinfo[NL80211_SURVEY_INFO_FREQUENCY])
                printf("\tfrequency:\t\t\t%u MHz%s\n",
                        nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]),
                        sinfo[NL80211_SURVEY_INFO_IN_USE] ? " [in use]" : "");
        if (sinfo[NL80211_SURVEY_INFO_NOISE])
                printf("\tnoise:\t\t\t\t%d dBm\n",
                        (int8_t)nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]));
        if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME])
                printf("\tchannel active time:\t\t%llu ms\n",
                        (unsigned long long)nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME]));
        if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_BUSY])
                printf("\tchannel busy time:\t\t%llu ms\n",
                        (unsigned long long)nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_BUSY]));
        if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_EXT_BUSY])
                printf("\textension channel busy time:\t%llu ms\n",
                        (unsigned long long)nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_EXT_BUSY]));
        if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_RX])
                printf("\tchannel receive time:\t\t%llu ms\n",
                        (unsigned long long)nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_RX]));
        if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_TX])
                printf("\tchannel transmit time:\t\t%llu ms\n",
                        (unsigned long long)nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_TX]));
        return NL_SKIP;
}

static int handle_survey_dump(struct nl80211_state *state,
                              struct nl_cb *cb,
                              struct nl_msg *msg,
                              int argc, char **argv,
                              enum id_input id)
{
        nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_survey_handler, NULL);
        return 0;
}
COMMAND(survey, dump, NULL,
        NL80211_CMD_GET_SURVEY, NLM_F_DUMP, CIB_NETDEV, handle_survey_dump,
        "List all gathered channel survey data");