static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
struct wpa_scan_results *scan_res)
{
int pri_chan, sec_chan;
int res;
pri_chan = iface->conf->channel;
sec_chan = pri_chan + iface->conf->secondary_channel * 4;
res = check_40mhz_5g(iface->current_mode, scan_res, pri_chan, sec_chan);
if (res == 2)
ieee80211n_switch_pri_sec(iface);
return !!res;
}
static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
struct wpa_scan_results *scan_res)
{
int pri_chan, sec_chan;
int res;
pri_chan = iface->conf->channel;
sec_chan = pri_chan + iface->conf->secondary_channel * 4;
res = check_40mhz_5g(iface->current_mode, scan_res, pri_chan, sec_chan);
if (res == 2) {
if (iface->conf->no_pri_sec_switch) {
wpa_printf(MSG_DEBUG,
"Cannot switch PRI/SEC channels due to local constraint");
} else {
ieee80211n_switch_pri_sec(iface);
}
}
return !!res;
}
static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
struct wpa_scan_results *scan_res)
{
int pri_chan, sec_chan, pri_freq, sec_freq, pri_bss, sec_bss;
int bss_pri_chan, bss_sec_chan;
size_t i;
int match;
pri_chan = iface->conf->channel;
sec_chan = iface->conf->secondary_channel * 4;
pri_freq = hostapd_hw_get_freq(iface->bss[0], pri_chan);
if (iface->conf->secondary_channel > 0)
sec_freq = pri_freq + 20;
else
sec_freq = pri_freq - 20;
/*
* Switch PRI/SEC channels if Beacons were detected on selected SEC
* channel, but not on selected PRI channel.
*/
pri_bss = sec_bss = 0;
for (i = 0; i < scan_res->num; i++) {
struct wpa_scan_res *bss = scan_res->res[i];
if (bss->freq == pri_freq)
pri_bss++;
else if (bss->freq == sec_freq)
sec_bss++;
}
if (sec_bss && !pri_bss) {
wpa_printf(MSG_INFO, "Switch own primary and secondary "
"channel to get secondary channel with no Beacons "
"from other BSSes");
ieee80211n_switch_pri_sec(iface);
}
/*
* Match PRI/SEC channel with any existing HT40 BSS on the same
* channels that we are about to use (if already mixed order in
* existing BSSes, use own preference).
*/
match = 0;
for (i = 0; i < scan_res->num; i++) {
struct wpa_scan_res *bss = scan_res->res[i];
ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
if (pri_chan == bss_pri_chan &&
sec_chan == bss_sec_chan) {
match = 1;
break;
}
}
if (!match) {
for (i = 0; i < scan_res->num; i++) {
struct wpa_scan_res *bss = scan_res->res[i];
ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan,
&bss_sec_chan);
if (pri_chan == bss_sec_chan &&
sec_chan == bss_pri_chan) {
wpa_printf(MSG_INFO, "Switch own primary and "
"secondary channel due to BSS "
"overlap with " MACSTR,
MAC2STR(bss->bssid));
ieee80211n_switch_pri_sec(iface);
break;
}
}
}
return 1;
}
