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;
iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
}
res = ieee80211n_allowed_ht40_channel_pair(iface);
hostapd_setup_interface_complete(iface, !res);
}
int hostapd_acs_completed(struct hostapd_iface *iface, int err)
{
int ret = -1;
if (err)
goto out;
switch (hostapd_check_chans(iface)) {
case HOSTAPD_CHAN_VALID:
wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO,
ACS_EVENT_COMPLETED "freq=%d channel=%d",
hostapd_hw_get_freq(iface->bss[0],
iface->conf->channel),
iface->conf->channel);
break;
case HOSTAPD_CHAN_ACS:
wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available");
wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
hostapd_notify_bad_chans(iface);
goto out;
case HOSTAPD_CHAN_INVALID:
default:
wpa_printf(MSG_ERROR, "ACS picked unusable channels");
wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
hostapd_notify_bad_chans(iface);
goto out;
}
ret = hostapd_check_ht_capab(iface);
if (ret < 0)
goto out;
if (ret == 1) {
wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback");
return 0;
}
ret = 0;
out:
return hostapd_setup_interface_complete(iface, ret);
}
static int hostapd_dfs_start_channel_switch_cac(struct hostapd_iface *iface)
{
struct hostapd_channel_data *channel;
int secondary_channel;
u8 vht_oper_centr_freq_seg0_idx = 0;
u8 vht_oper_centr_freq_seg1_idx = 0;
int skip_radar = 0;
int err = 1;
/* Radar detected during active CAC */
iface->cac_started = 0;
channel = dfs_get_valid_channel(iface, &secondary_channel,
&vht_oper_centr_freq_seg0_idx,
&vht_oper_centr_freq_seg1_idx,
skip_radar);
if (!channel) {
wpa_printf(MSG_ERROR, "No valid channel available");
return err;
}
wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d",
channel->chan);
wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL
"freq=%d chan=%d sec_chan=%d", channel->freq,
channel->chan, secondary_channel);
iface->freq = channel->freq;
iface->conf->channel = channel->chan;
iface->conf->secondary_channel = secondary_channel;
iface->conf->vht_oper_centr_freq_seg0_idx =
vht_oper_centr_freq_seg0_idx;
iface->conf->vht_oper_centr_freq_seg1_idx =
vht_oper_centr_freq_seg1_idx;
err = 0;
hostapd_setup_interface_complete(iface, err);
return err;
}
static void ap_ht40_scan_retry(void *eloop_data, void *user_data)
{
#define HT2040_COEX_SCAN_RETRY 15
struct hostapd_iface *iface = eloop_data;
struct wpa_driver_scan_params params;
int ret;
os_memset(¶ms, 0, sizeof(params));
if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
ieee80211n_scan_channels_2g4(iface, ¶ms);
else
ieee80211n_scan_channels_5g(iface, ¶ms);
ret = hostapd_driver_scan(iface->bss[0], ¶ms);
iface->num_ht40_scan_tries++;
os_free(params.freqs);
if (ret == -EBUSY &&
iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) {
wpa_printf(MSG_ERROR,
"Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)",
ret, strerror(-ret), iface->num_ht40_scan_tries);
eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
return;
}
if (ret == 0) {
iface->scan_cb = ieee80211n_check_scan;
return;
}
wpa_printf(MSG_DEBUG,
"Failed to request a scan in device, bringing up in HT20 mode");
iface->conf->secondary_channel = 0;
iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
hostapd_setup_interface_complete(iface, 0);
}
