[v2] hostapd: DFS print CAC info in status cli command

diff --git a/src/ap/ap_drv_ops.c b/src/ap/ap_drv_ops.c
index 5ba48c9..24eaff1 100644
--- a/src/ap/ap_drv_ops.c
+++ b/src/ap/ap_drv_ops.c
@@ -773,8 +773,10 @@  int hostapd_start_dfs_cac(struct hostapd_iface *iface, int mode, int freq,
 	}
 
 	res = hapd->driver->start_dfs_cac(hapd->drv_priv, &data);
-	if (!res)
+	if (!res) {
 		iface->cac_started = 1;
+		os_get_reltime(&iface->dfs_cac_start);
+	}
 
 	return res;
 }
diff --git a/src/ap/ctrl_iface_ap.c b/src/ap/ctrl_iface_ap.c
index 8c0cbab..ed915a8 100644
--- a/src/ap/ctrl_iface_ap.c
+++ b/src/ap/ctrl_iface_ap.c
@@ -395,6 +395,7 @@  int hostapd_ctrl_iface_status(struct hostapd_data *hapd, char *buf,
 {
 	struct hostapd_iface *iface = hapd->iface;
 	int len = 0, ret;
+	char cac_time[100];
 	size_t i;
 
 	ret = os_snprintf(buf + len, buflen - len,
@@ -426,6 +427,31 @@  int hostapd_ctrl_iface_status(struct hostapd_data *hapd, char *buf,
 		return len;
 	len += ret;
 
+	if (!iface->cac_started || !iface->dfs_cac_ms) {
+		os_snprintf(cac_time, sizeof(cac_time),
+			    "cac_time_seconds=%d\n"
+			    "cac_time_left_seconds=N/A\n",
+			    iface->dfs_cac_ms/1000);
+	} else {
+		/* CAC started and CAC time set - calc left time */
+		struct os_reltime now;
+		unsigned int left_time;
+
+		os_reltime_age(&iface->dfs_cac_start, &now);
+		left_time = iface->dfs_cac_ms/1000 - now.sec;
+		os_snprintf(cac_time, sizeof(cac_time),
+			    "cac_time_seconds=%u\n"
+			    "cac_time_left_seconds=%u\n",
+			    iface->dfs_cac_ms/1000,
+			    left_time);
+	}
+
+	ret = os_snprintf(buf + len, buflen - len,
+			  "%s", cac_time);
+	if (ret < 0 || (size_t) ret >= buflen -len)
+		return len;
+	len += ret;
+
 	ret = os_snprintf(buf + len, buflen - len,
 			  "channel=%u\n"
 			  "secondary_channel=%d\n"
diff --git a/src/ap/dfs.c b/src/ap/dfs.c
index 92eda21..9e876ad 100644
--- a/src/ap/dfs.c
+++ b/src/ap/dfs.c
@@ -541,6 +541,28 @@  static int dfs_are_channels_overlapped(struct hostapd_iface *iface, int freq,
 }
 
 
+static unsigned int dfs_get_cac_time(struct hostapd_iface *iface,
+				     int start_chan_idx,
+				     int n_chans)
+{
+	struct hostapd_channel_data *channel;
+	struct hostapd_hw_modes *mode;
+	int i;
+	unsigned int cac_time_ms = 0;
+
+	mode = iface->current_mode;
+
+	for (i = 0; i < n_chans; i++) {
+		channel = &mode->channels[start_chan_idx + i];
+		if (!(channel->flag & HOSTAPD_CHAN_RADAR))
+			continue;
+		if (channel->dfs_cac_ms > cac_time_ms)
+			cac_time_ms = channel->dfs_cac_ms;
+	}
+
+	return cac_time_ms;
+}
+
 /*
  * Main DFS handler
  * 1 - continue channel/ap setup
@@ -564,6 +586,9 @@  int hostapd_handle_dfs(struct hostapd_iface *iface)
 		/* Get number of used channels, depend on width */
 		n_chans = dfs_get_used_n_chans(iface);
 
+		/* 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,
@@ -608,12 +633,13 @@  int hostapd_handle_dfs(struct hostapd_iface *iface)
 	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",
+		"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->conf->vht_oper_centr_freq_seg1_idx,
+		iface->dfs_cac_ms/1000);
 
 	res = hostapd_start_dfs_cac(iface, iface->conf->hw_mode,
 				    iface->freq,
diff --git a/src/ap/hostapd.h b/src/ap/hostapd.h
index 489ab16..29b8ad0 100644
--- a/src/ap/hostapd.h
+++ b/src/ap/hostapd.h
@@ -345,6 +345,9 @@  struct hostapd_iface {
 	unsigned int cs_c_off_proberesp;
 	int csa_in_progress;
 
+	u32 dfs_cac_ms;
+	struct os_reltime dfs_cac_start;
+
 #ifdef CONFIG_ACS
 	unsigned int acs_num_completed_scans;
 #endif /* CONFIG_ACS */
diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index b6434c2..0a7bf12 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -93,6 +93,9 @@  struct hostapd_channel_data {
 	 */
 	long double interference_factor;
 #endif /* CONFIG_ACS */
+
+	/* DFS CAC time in milliseconds */
+	u32 dfs_cac_ms;
 };
 
 #define HOSTAPD_MODE_FLAG_HT_INFO_KNOWN BIT(0)
diff --git a/src/drivers/driver_nl80211.c b/src/drivers/driver_nl80211.c
index 7468e5d..8f77c67 100644
--- a/src/drivers/driver_nl80211.c
+++ b/src/drivers/driver_nl80211.c
@@ -6164,6 +6164,7 @@  static void phy_info_freq(struct hostapd_hw_modes *mode,
 	u8 channel;
 	chan->freq = nla_get_u32(tb_freq[NL80211_FREQUENCY_ATTR_FREQ]);
 	chan->flag = 0;
+	chan->dfs_cac_ms = 0;
 	if (ieee80211_freq_to_chan(chan->freq, &channel) != NUM_HOSTAPD_MODES)
 		chan->chan = channel;
 
@@ -6190,6 +6191,9 @@  static void phy_info_freq(struct hostapd_hw_modes *mode,
 			break;
 		}
 	}
+
+	if (tb_freq[NL80211_FREQUENCY_ATTR_DFS_CAC_TIME])
+		chan->dfs_cac_ms = nla_get_u32(tb_freq[NL80211_FREQUENCY_ATTR_DFS_CAC_TIME]);
 }