static void acs_scan_complete(struct hostapd_iface *iface)
{
int err;
iface->scan_cb = NULL;
wpa_printf(MSG_DEBUG, "ACS: Using survey based algorithm (acs_num_scans=%d)",
iface->conf->acs_num_scans);
err = hostapd_drv_get_survey(iface->bss[0], 0);
if (err) {
wpa_printf(MSG_ERROR, "ACS: Failed to get survey data");
goto fail;
}
if (++iface->acs_num_completed_scans < iface->conf->acs_num_scans) {
err = acs_request_scan(iface);
if (err) {
wpa_printf(MSG_ERROR, "ACS: Failed to request scan");
goto fail;
}
return;
}
acs_study(iface);
return;
fail:
hostapd_acs_completed(iface, 1);
acs_fail(iface);
}
static void acs_study(struct hostapd_iface *iface)
{
struct hostapd_channel_data *ideal_chan;
int err;
err = acs_study_options(iface);
if (err < 0) {
wpa_printf(MSG_ERROR, "ACS: All study options have failed");
goto fail;
}
ideal_chan = acs_find_ideal_chan(iface);
if (!ideal_chan) {
wpa_printf(MSG_ERROR, "ACS: Failed to compute ideal channel");
err = -1;
goto fail;
}
iface->conf->channel = ideal_chan->chan;
if (iface->conf->ieee80211ac)
acs_adjust_vht_center_freq(iface);
err = 0;
fail:
/*
* hostapd_setup_interface_complete() will return -1 on failure,
* 0 on success and 0 is HOSTAPD_CHAN_VALID :)
*/
if (hostapd_acs_completed(iface, err) == HOSTAPD_CHAN_VALID) {
acs_cleanup(iface);
return;
}
/* This can possibly happen if channel parameters (secondary
* channel, center frequencies) are misconfigured */
wpa_printf(MSG_ERROR, "ACS: Possibly channel configuration is invalid, please report this along with your config file.");
acs_fail(iface);
}
void hostapd_acs_channel_selected(struct hostapd_data *hapd,
struct acs_selected_channels *acs_res)
{
int ret, i;
int err = 0;
if (hapd->iconf->channel) {
wpa_printf(MSG_INFO, "ACS: Channel was already set to %d",
hapd->iconf->channel);
return;
}
if (!hapd->iface->current_mode) {
for (i = 0; i < hapd->iface->num_hw_features; i++) {
struct hostapd_hw_modes *mode =
&hapd->iface->hw_features[i];
if (mode->mode == acs_res->hw_mode) {
hapd->iface->current_mode = mode;
break;
}
}
if (!hapd->iface->current_mode) {
hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_WARNING,
"driver selected to bad hw_mode");
err = 1;
goto out;
}
}
hapd->iface->freq = hostapd_hw_get_freq(hapd, acs_res->pri_channel);
if (!acs_res->pri_channel) {
hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_WARNING,
"driver switched to bad channel");
err = 1;
goto out;
}
hapd->iconf->channel = acs_res->pri_channel;
hapd->iconf->acs = 1;
if (acs_res->sec_channel == 0)
hapd->iconf->secondary_channel = 0;
else if (acs_res->sec_channel < acs_res->pri_channel)
hapd->iconf->secondary_channel = -1;
else if (acs_res->sec_channel > acs_res->pri_channel)
hapd->iconf->secondary_channel = 1;
else {
wpa_printf(MSG_ERROR, "Invalid secondary channel!");
err = 1;
goto out;
}
if (hapd->iface->conf->ieee80211ac) {
/* set defaults for backwards compatibility */
hapd->iconf->vht_oper_centr_freq_seg1_idx = 0;
hapd->iconf->vht_oper_centr_freq_seg0_idx = 0;
hapd->iconf->vht_oper_chwidth = VHT_CHANWIDTH_USE_HT;
if (acs_res->ch_width == 80) {
hapd->iconf->vht_oper_centr_freq_seg0_idx =
acs_res->vht_seg0_center_ch;
hapd->iconf->vht_oper_chwidth = VHT_CHANWIDTH_80MHZ;
} else if (acs_res->ch_width == 160) {
if (acs_res->vht_seg1_center_ch == 0) {
hapd->iconf->vht_oper_centr_freq_seg0_idx =
acs_res->vht_seg0_center_ch;
hapd->iconf->vht_oper_chwidth =
VHT_CHANWIDTH_160MHZ;
} else {
hapd->iconf->vht_oper_centr_freq_seg0_idx =
acs_res->vht_seg0_center_ch;
hapd->iconf->vht_oper_centr_freq_seg1_idx =
acs_res->vht_seg1_center_ch;
hapd->iconf->vht_oper_chwidth =
VHT_CHANWIDTH_80P80MHZ;
}
}
}
out:
ret = hostapd_acs_completed(hapd->iface, err);
if (ret) {
wpa_printf(MSG_ERROR,
"ACS: Possibly channel configuration is invalid");
}
}