enum hostapd_chan_status acs_init(struct hostapd_iface *iface)
{
int err;
wpa_printf(MSG_INFO, "ACS: Automatic channel selection started, this may take a bit");
if (iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) {
wpa_printf(MSG_INFO, "ACS: Offloading to driver");
err = hostapd_drv_do_acs(iface->bss[0]);
if (err)
return HOSTAPD_CHAN_INVALID;
return HOSTAPD_CHAN_ACS;
}
acs_cleanup(iface);
err = acs_request_scan(iface);
if (err < 0)
return HOSTAPD_CHAN_INVALID;
hostapd_set_state(iface, HAPD_IFACE_ACS);
wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_STARTED);
return HOSTAPD_CHAN_ACS;
}
static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
{
struct wpa_driver_scan_params params;
if (!iface->conf->secondary_channel || iface->conf->noscan)
return 0; /* HT40 not used */
hostapd_set_state(iface, HAPD_IFACE_HT_SCAN);
wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
"40 MHz channel");
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);
if (hostapd_driver_scan(iface->bss[0], ¶ms) < 0) {
wpa_printf(MSG_ERROR, "Failed to request a scan of "
"neighboring BSSes");
os_free(params.freqs);
return -1;
}
os_free(params.freqs);
iface->scan_cb = ieee80211n_check_scan;
return 1;
}
static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
{
struct wpa_driver_scan_params params;
int ret;
if (!iface->conf->secondary_channel)
return 0; /* HT40 not used */
hostapd_set_state(iface, HAPD_IFACE_HT_SCAN);
wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
"40 MHz channel");
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);
os_free(params.freqs);
if (ret == -EBUSY) {
wpa_printf(MSG_ERROR,
"Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again",
ret, strerror(-ret));
iface->num_ht40_scan_tries = 1;
eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
//DRIVER_RTW Modify
//return -1;
return 0;//ignore this error
}
if (ret < 0) {
wpa_printf(MSG_ERROR,
"Failed to request a scan of neighboring BSSes ret=%d (%s)",
ret, strerror(-ret));
return -1;
}
iface->scan_cb = ieee80211n_check_scan;
return 1;
}
/*
* Main DFS handler
* 1 - continue channel/ap setup
* 0 - channel/ap setup will be continued after CAC
* -1 - hit critical error
*/
int hostapd_handle_dfs(struct hostapd_iface *iface)
{
struct hostapd_channel_data *channel;
int res, n_chans, n_chans1, start_chan_idx, start_chan_idx1;
int skip_radar = 0;
if (!iface->current_mode) {
/*
* This can happen with drivers that do not provide mode
* information and as such, cannot really use hostapd for DFS.
*/
wpa_printf(MSG_DEBUG,
"DFS: No current_mode information - assume no need to perform DFS operations by hostapd");
return 1;
}
iface->cac_started = 0;
do {
/* Get start (first) channel for current configuration */
start_chan_idx = dfs_get_start_chan_idx(iface,
&start_chan_idx1);
if (start_chan_idx == -1)
return -1;
/* Get number of used channels, depend on width */
n_chans = dfs_get_used_n_chans(iface, &n_chans1);
/* Setup CAC time */
iface->dfs_cac_ms = dfs_get_cac_time(iface, start_chan_idx,
n_chans);
/* Check if any of configured channels require DFS */
res = dfs_check_chans_radar(iface, start_chan_idx, n_chans);
wpa_printf(MSG_DEBUG,
"DFS %d channels required radar detection",
res);
if (!res)
return 1;
/* Check if all channels are DFS available */
res = dfs_check_chans_available(iface, start_chan_idx, n_chans);
wpa_printf(MSG_DEBUG,
"DFS all channels available, (SKIP CAC): %s",
res ? "yes" : "no");
if (res)
return 1;
/* Check if any of configured channels is unavailable */
res = dfs_check_chans_unavailable(iface, start_chan_idx,
n_chans);
wpa_printf(MSG_DEBUG, "DFS %d chans unavailable - choose other channel: %s",
res, res ? "yes": "no");
if (res) {
int sec = 0;
u8 cf1 = 0, cf2 = 0;
channel = dfs_get_valid_channel(iface, &sec, &cf1, &cf2,
skip_radar);
if (!channel) {
wpa_printf(MSG_ERROR, "could not get valid channel");
hostapd_set_state(iface, HAPD_IFACE_DFS);
return 0;
}
iface->freq = channel->freq;
iface->conf->channel = channel->chan;
iface->conf->secondary_channel = sec;
iface->conf->vht_oper_centr_freq_seg0_idx = cf1;
iface->conf->vht_oper_centr_freq_seg1_idx = cf2;
}
} while (res);
/* Finally start CAC */
hostapd_set_state(iface, HAPD_IFACE_DFS);
wpa_printf(MSG_DEBUG, "DFS start CAC on %d MHz", iface->freq);
wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START
"freq=%d chan=%d sec_chan=%d, width=%d, seg0=%d, seg1=%d, cac_time=%ds",
iface->freq,
iface->conf->channel, iface->conf->secondary_channel,
iface->conf->vht_oper_chwidth,
iface->conf->vht_oper_centr_freq_seg0_idx,
iface->conf->vht_oper_centr_freq_seg1_idx,
iface->dfs_cac_ms / 1000);
res = hostapd_start_dfs_cac(iface, iface->conf->hw_mode,
iface->freq,
iface->conf->channel,
iface->conf->ieee80211n,
iface->conf->ieee80211ac,
iface->conf->secondary_channel,
iface->conf->vht_oper_chwidth,
iface->conf->vht_oper_centr_freq_seg0_idx,
iface->conf->vht_oper_centr_freq_seg1_idx);
if (res) {
wpa_printf(MSG_ERROR, "DFS start_dfs_cac() failed, %d", res);
return -1;
}
return 0;
}