int hostapd_check_ht_capab(struct hostapd_iface *iface)
{
#ifdef CONFIG_IEEE80211N
int ret;
if (!iface->conf->ieee80211n)
return 0;
if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211B &&
iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G &&
(iface->conf->ht_capab & HT_CAP_INFO_DSSS_CCK40MHZ)) {
wpa_printf(MSG_DEBUG,
"Disable HT capability [DSSS_CCK-40] on 5 GHz band");
iface->conf->ht_capab &= ~HT_CAP_INFO_DSSS_CCK40MHZ;
}
if (!ieee80211n_supported_ht_capab(iface))
return -1;
#ifdef CONFIG_IEEE80211AC
if (!ieee80211ac_supported_vht_capab(iface))
return -1;
#endif /* CONFIG_IEEE80211AC */
ret = ieee80211n_check_40mhz(iface);
if (ret)
return ret;
if (!ieee80211n_allowed_ht40_channel_pair(iface))
return -1;
#endif /* CONFIG_IEEE80211N */
return 0;
}
static void ieee80211n_check_scan(struct hostapd_iface *iface)
{
struct wpa_scan_results *scan_res;
int oper40;
int res;
/* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
* allowed per IEEE Std 802.11-2012, 10.15.3.2 */
iface->scan_cb = NULL;
scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
if (scan_res == NULL) {
hostapd_setup_interface_complete(iface, 1);
return;
}
if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
else
oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
wpa_scan_results_free(scan_res);
if (!oper40) {
wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
"channel pri=%d sec=%d based on overlapping BSSes",
iface->conf->channel,
iface->conf->channel +
iface->conf->secondary_channel * 4);
iface->conf->secondary_channel = 0;
}
res = ieee80211n_allowed_ht40_channel_pair(iface);
hostapd_setup_interface_complete(iface, !res);
}
static void ieee80211n_check_scan(struct hostapd_iface *iface)
{
struct wpa_scan_results *scan_res;
int oper40;
int res;
/* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
* allowed per IEEE Std 802.11-2012, 10.15.3.2 */
iface->scan_cb = NULL;
scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
if (scan_res == NULL) {
hostapd_setup_interface_complete(iface, 1);
return;
}
if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
else
oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
wpa_scan_results_free(scan_res);
iface->secondary_ch = iface->conf->secondary_channel;
if (!oper40) {
wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
"channel pri=%d sec=%d based on overlapping BSSes",
iface->conf->channel,
iface->conf->channel +
iface->conf->secondary_channel * 4);
iface->conf->secondary_channel = 0;
if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) {
/*
* TODO: Could consider scheduling another scan to check
* if channel width can be changed if no coex reports
* are received from associating stations.
*/
}
}
res = ieee80211n_allowed_ht40_channel_pair(iface);
if (!res) {
iface->conf->secondary_channel = 0;
iface->conf->vht_oper_centr_freq_seg0_idx = 0;
iface->conf->vht_oper_centr_freq_seg1_idx = 0;
iface->conf->vht_oper_chwidth = VHT_CHANWIDTH_USE_HT;
res = 1;
wpa_printf(MSG_INFO, "Fallback to 20 MHz");
}
hostapd_setup_interface_complete(iface, !res);
}
int hostapd_check_ht_capab(struct hostapd_iface *iface)
{
#ifdef CONFIG_IEEE80211N
int ret;
ret = ieee80211n_check_40mhz(iface);
if (ret)
return ret;
if (!ieee80211n_allowed_ht40_channel_pair(iface))
return -1;
if (!ieee80211n_supported_ht_capab(iface))
return -1;
#endif /* CONFIG_IEEE80211N */
return 0;
}