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hostapd: Add support for DFS channels in CHAN_SWITCH

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Enable support for DFS channels in the CHAN_SWITCH command. Perform CAC
instead of CSA if DFS channel is selected. Then restart normal AP
operations.

Note that the current implementation provides a simplified approach. It
does not check if the selected DFS channel block is already in the
HOSTAPD_CHAN_DFS_AVAILABLE state. CAC procedure is restarted anyway.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
This commit is contained in:
Sergey Matyukevich 2020-01-28 15:09:53 +00:00 committed by Jouni Malinen
parent 683e7c7559
commit c60717f839
1 changed files with 59 additions and 0 deletions
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59
hostapd/ctrl_iface.c
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@ -59,6 +59,7 @@
#include "ap/neighbor_db.h"
#include "ap/rrm.h"
#include "ap/dpp_hostapd.h"
#include "ap/dfs.h"
#include "wps/wps_defs.h"
#include "wps/wps.h"
#include "fst/fst_ctrl_iface.h"
@ -2528,7 +2529,10 @@ static int hostapd_ctrl_iface_chan_switch(struct hostapd_iface *iface,
#ifdef NEED_AP_MLME
struct csa_settings settings;
int ret;
int dfs_range = 0;
unsigned int i;
int bandwidth;
u8 chan;
ret = hostapd_parse_csa_settings(pos, &settings);
if (ret)
@ -2541,6 +2545,61 @@ static int hostapd_ctrl_iface_chan_switch(struct hostapd_iface *iface,
return ret;
}
switch (settings.freq_params.bandwidth) {
case 40:
bandwidth = CHAN_WIDTH_40;
break;
case 80:
if (settings.freq_params.center_freq2)
bandwidth = CHAN_WIDTH_80P80;
else
bandwidth = CHAN_WIDTH_80;
break;
case 160:
bandwidth = CHAN_WIDTH_160;
break;
default:
bandwidth = CHAN_WIDTH_20;
break;
}
if (settings.freq_params.center_freq1)
dfs_range += hostapd_is_dfs_overlap(
iface, bandwidth, settings.freq_params.center_freq1);
else
dfs_range += hostapd_is_dfs_overlap(
iface, bandwidth, settings.freq_params.freq);
if (settings.freq_params.center_freq2)
dfs_range += hostapd_is_dfs_overlap(
iface, bandwidth, settings.freq_params.center_freq2);
if (dfs_range) {
ret = ieee80211_freq_to_chan(settings.freq_params.freq, &chan);
if (ret == NUM_HOSTAPD_MODES) {
wpa_printf(MSG_ERROR,
"Failed to get channel for (freq=%d, sec_channel_offset=%d, bw=%d)",
settings.freq_params.freq,
settings.freq_params.sec_channel_offset,
settings.freq_params.bandwidth);
return -1;
}
settings.freq_params.channel = chan;
wpa_printf(MSG_DEBUG,
"DFS/CAC to (channel=%u, freq=%d, sec_channel_offset=%d, bw=%d, center_freq1=%d)",
settings.freq_params.channel,
settings.freq_params.freq,
settings.freq_params.sec_channel_offset,
settings.freq_params.bandwidth,
settings.freq_params.center_freq1);
/* Perform CAC and switch channel */
hostapd_switch_channel_fallback(iface, &settings.freq_params);
return 0;
}
for (i = 0; i < iface->num_bss; i++) {
/* Save CHAN_SWITCH VHT config */