libeap/src/ap/bss_load.c

   1 /*
   2  * BSS Load Element / Channel Utilization
   3  * Copyright (c) 2014, Qualcomm Atheros, Inc.
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "hostapd.h"
  14 #include "bss_load.h"
  15 #include "ap_drv_ops.h"
  16 #include "beacon.h"
  17
  18
  19 static void update_channel_utilization(void *eloop_data, void *user_data)
  20 {
  21         struct hostapd_data *hapd = eloop_data;
  22         unsigned int sec, usec;
  23         int err;
  24
  25         if (!(hapd->beacon_set_done && hapd->started))
  26                 return;
  27
  28         err = hostapd_drv_get_survey(hapd, hapd->iface->freq);
  29         if (err) {
  30                 wpa_printf(MSG_ERROR, "BSS Load: Failed to get survey data");
  31                 return;
  32         }
  33
  34         ieee802_11_set_beacon(hapd);
  35
  36         sec = ((hapd->bss_load_update_timeout / 1000) * 1024) / 1000;
  37         usec = (hapd->bss_load_update_timeout % 1000) * 1024;
  38         eloop_register_timeout(sec, usec, update_channel_utilization, hapd,
  39                                NULL);
  40 }
  41
  42
  43 int bss_load_update_init(struct hostapd_data *hapd)
  44 {
  45         struct hostapd_bss_config *conf = hapd->conf;
  46         struct hostapd_config *iconf = hapd->iconf;
  47         unsigned int sec, usec;
  48
  49         if (!conf->bss_load_update_period || !iconf->beacon_int)
  50                 return -1;
  51
  52         hapd->bss_load_update_timeout = conf->bss_load_update_period *
  53                                         iconf->beacon_int;
  54         sec = ((hapd->bss_load_update_timeout / 1000) * 1024) / 1000;
  55         usec = (hapd->bss_load_update_timeout % 1000) * 1024;
  56         eloop_register_timeout(sec, usec, update_channel_utilization, hapd,
  57                                NULL);
  58         return 0;
  59 }
  60
  61
  62 void bss_load_update_deinit(struct hostapd_data *hapd)
  63 {
  64         eloop_cancel_timeout(update_channel_utilization, hapd, NULL);
  65 }