int ap_switch_channel(struct wpa_supplicant *wpa_s,
struct csa_settings *settings)
{
#ifdef NEED_AP_MLME
if (!wpa_s->ap_iface || !wpa_s->ap_iface->bss[0])
return -1;
return hostapd_switch_channel(wpa_s->ap_iface->bss[0], settings);
#else /* NEED_AP_MLME */
return -1;
#endif /* NEED_AP_MLME */
}
static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface)
{
struct hostapd_channel_data *channel;
int secondary_channel;
u8 vht_oper_centr_freq_seg0_idx;
u8 vht_oper_centr_freq_seg1_idx;
int skip_radar = 1;
struct csa_settings csa_settings;
unsigned int i;
int err = 1;
wpa_printf(MSG_DEBUG, "%s called (CAC active: %s, CSA active: %s)",
__func__, iface->cac_started ? "yes" : "no",
hostapd_csa_in_progress(iface) ? "yes" : "no");
/* Check if CSA in progress */
if (hostapd_csa_in_progress(iface))
return 0;
/* Check if active CAC */
if (iface->cac_started)
return hostapd_dfs_start_channel_switch_cac(iface);
/* Perform channel switch/CSA */
channel = dfs_get_valid_channel(iface, &secondary_channel,
&vht_oper_centr_freq_seg0_idx,
&vht_oper_centr_freq_seg1_idx,
skip_radar);
if (!channel) {
/*
* If there is no channel to switch immediately to, check if
* there is another channel where we can switch even if it
* requires to perform a CAC first.
*/
skip_radar = 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_INFO,
"%s: no DFS channels left, waiting for NOP to finish",
__func__);
return err;
}
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;
hostapd_disable_iface(iface);
hostapd_enable_iface(iface);
return 0;
}
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);
/* Setup CSA request */
os_memset(&csa_settings, 0, sizeof(csa_settings));
csa_settings.cs_count = 5;
csa_settings.block_tx = 1;
err = hostapd_set_freq_params(&csa_settings.freq_params,
iface->conf->hw_mode,
channel->freq,
channel->chan,
iface->conf->ieee80211n,
iface->conf->ieee80211ac,
secondary_channel,
iface->conf->vht_oper_chwidth,
vht_oper_centr_freq_seg0_idx,
vht_oper_centr_freq_seg1_idx,
iface->current_mode->vht_capab,
iface->conf->bwmode);
if (err) {
wpa_printf(MSG_ERROR, "DFS failed to calculate CSA freq params");
hostapd_disable_iface(iface);
return err;
}
for (i = 0; i < iface->num_bss; i++) {
err = hostapd_switch_channel(iface->bss[i], &csa_settings);
if (err)
break;
}
if (err) {
wpa_printf(MSG_WARNING, "DFS failed to schedule CSA (%d) - trying fallback",
err);
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;
hostapd_disable_iface(iface);
hostapd_enable_iface(iface);
return 0;
}
/* Channel configuration will be updated once CSA completes and
* ch_switch_notify event is received */
wpa_printf(MSG_DEBUG, "DFS waiting channel switch event");
return 0;
}
