hostap/src/ap/bss_load.c

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/*
* BSS Load Element / Channel Utilization
* Copyright (c) 2014, Qualcomm Atheros, Inc.
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "utils/eloop.h"
#include "hostapd.h"
#include "bss_load.h"
#include "ap_drv_ops.h"
#include "beacon.h"
static int get_bss_load_update_timeout(struct hostapd_data *hapd,
unsigned int *sec, unsigned int *usec)
{
unsigned int update_period = hapd->conf->bss_load_update_period;
unsigned int beacon_int = hapd->iconf->beacon_int;
unsigned int update_timeout;
if (!update_period || !beacon_int) {
wpa_printf(MSG_ERROR,
"BSS Load: Invalid BSS load update configuration (period=%u beacon_int=%u)",
update_period, beacon_int);
return -1;
}
update_timeout = update_period * beacon_int;
*sec = ((update_timeout / 1000) * 1024) / 1000;
*usec = (update_timeout % 1000) * 1024;
return 0;
}
static void update_channel_utilization(void *eloop_data, void *user_data)
{
struct hostapd_data *hapd = eloop_data;
unsigned int sec, usec;
int err;
if (!(hapd->beacon_set_done && hapd->started))
return;
err = hostapd_drv_get_survey(hapd, hapd->iface->freq);
if (err) {
wpa_printf(MSG_ERROR, "BSS Load: Failed to get survey data");
return;
}
ieee802_11_set_beacon(hapd);
if (get_bss_load_update_timeout(hapd, &sec, &usec) < 0)
return;
eloop_register_timeout(sec, usec, update_channel_utilization, hapd,
NULL);
}
int bss_load_update_init(struct hostapd_data *hapd)
{
unsigned int sec, usec;
if (get_bss_load_update_timeout(hapd, &sec, &usec) < 0)
return -1;
eloop_register_timeout(sec, usec, update_channel_utilization, hapd,
NULL);
return 0;
}
void bss_load_update_deinit(struct hostapd_data *hapd)
{
eloop_cancel_timeout(update_channel_utilization, hapd, NULL);
}