mesh: Show peer connected time in the wpa_cli STA cmd output for Mesh mode

When a Mesh interface is managed by wpa_supplicant, include the peer
link connected time (secs) in the output of "sta <addr>", "all_sta"
wpa_cli cmds for each peer. This will be helpful to find when the peer
link connection got established. The NL80211_STA_INFO_CONNECTED_TIME
netlink attribute data is used for this purpose if available.

$ wpa_cli -i mesh0 all_sta
02:00:00:00:02:00
flags=[ASSOC][WMM][HT]
aid=1
capability=0x0
listen_interval=0
supported_rates=82 84 8b 96 8c 12 98 24 b0 48 60 6c
timeout_next=NULLFUNC POLL
rx_packets=77
tx_packets=3
rx_bytes=8510
tx_bytes=284
inactive_msec=104
signal=-30
rx_rate_info=65 mcs 0
tx_rate_info=65 mcs 0
ht_mcs_bitmask=ffff0000000000000000
connected_time=24
ht_caps_info=0x103c

The connected_time field in the output of "hostapd_cli -i ap0 all_sta"
cmd is not affected and it will continue to show the connected time
maintained by hostapd for each STA.

Signed-off-by: Gokul Sivakumar <gokulkumar792@gmail.com>

src/ap/ctrl_iface_ap.c

@@ -50,6 +50,32 @@ static size_t hostapd_write_ht_mcs_bitmask(char *buf, size_t buflen,
 }
 
 
+static int hostapd_get_sta_conn_time(struct sta_info *sta,
+				     struct hostap_sta_driver_data *data,
+				     char *buf, size_t buflen)
+{
+	struct os_reltime age;
+	unsigned long secs;
+	int ret;
+
+	if (sta->connected_time.sec) {
+		/* Locally maintained time in AP mode */
+		os_reltime_age(&sta->connected_time, &age);
+		secs = (unsigned long) age.sec;
+	} else if (data->flags & STA_DRV_DATA_CONN_TIME) {
+		/* Time from the driver in mesh mode */
+		secs = data->connected_sec;
+	} else {
+		return 0;
+	}
+
+	ret = os_snprintf(buf, buflen, "connected_time=%lu\n", secs);
+	if (os_snprintf_error(buflen, ret))
+		return 0;
+	return ret;
+}
+
+
 static int hostapd_get_sta_tx_rx(struct hostapd_data *hapd,
 				 struct sta_info *sta,
 				 char *buf, size_t buflen)
@@ -160,26 +186,9 @@ static int hostapd_get_sta_tx_rx(struct hostapd_data *hapd,
 			len += ret;
 	}
 
-	return len;
-}
-
-
-static int hostapd_get_sta_conn_time(struct sta_info *sta,
-				     char *buf, size_t buflen)
-{
-	struct os_reltime age;
-	int ret;
-
-	if (!sta->connected_time.sec)
-		return 0;
-
-	os_reltime_age(&sta->connected_time, &age);
+	len += hostapd_get_sta_conn_time(sta, &data, buf + len, buflen - len);
 
-	ret = os_snprintf(buf, buflen, "connected_time=%u\n",
-			  (unsigned int) age.sec);
-	if (os_snprintf_error(buflen, ret))
-		return 0;
-	return ret;
+	return len;
 }
 
 
@@ -264,7 +273,6 @@ static int hostapd_ctrl_iface_sta_mib(struct hostapd_data *hapd,
 		len += res;
 
 	len += hostapd_get_sta_tx_rx(hapd, sta, buf + len, buflen - len);
-	len += hostapd_get_sta_conn_time(sta, buf + len, buflen - len);
 
 #ifdef CONFIG_SAE
 	if (sta->sae && sta->sae->state == SAE_ACCEPTED) {

src/drivers/driver.h

@@ -2151,6 +2151,7 @@ struct hostapd_data;
 #define STA_DRV_DATA_TX_SHORT_GI BIT(6)
 #define STA_DRV_DATA_RX_SHORT_GI BIT(7)
 #define STA_DRV_DATA_LAST_ACK_RSSI BIT(8)
+#define STA_DRV_DATA_CONN_TIME BIT(9)
 
 struct hostap_sta_driver_data {
 	unsigned long rx_packets, tx_packets;
@@ -2160,6 +2161,7 @@ struct hostap_sta_driver_data {
 	unsigned long current_tx_rate;
 	unsigned long current_rx_rate;
 	unsigned long inactive_msec;
+	unsigned long connected_sec;
 	unsigned long flags; /* bitfield of STA_DRV_DATA_* */
 	unsigned long num_ps_buf_frames;
 	unsigned long tx_retry_failed;

src/drivers/driver_nl80211.c

@@ -7035,6 +7035,7 @@ static int get_sta_handler(struct nl_msg *msg, void *arg)
 		[NL80211_STA_INFO_ACK_SIGNAL] = { .type = NLA_U8 },
 		[NL80211_STA_INFO_RX_DURATION] = { .type = NLA_U64 },
 		[NL80211_STA_INFO_TX_DURATION] = { .type = NLA_U64 },
+		[NL80211_STA_INFO_CONNECTED_TIME] = { .type = NLA_U32 },
 	};
 	struct nlattr *rate[NL80211_RATE_INFO_MAX + 1];
 	static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
@@ -7109,6 +7110,12 @@ static int get_sta_handler(struct nl_msg *msg, void *arg)
 		data->flags |= STA_DRV_DATA_LAST_ACK_RSSI;
 	}
 
+	if (stats[NL80211_STA_INFO_CONNECTED_TIME]) {
+		data->connected_sec =
+			nla_get_u32(stats[NL80211_STA_INFO_CONNECTED_TIME]);
+		data->flags |= STA_DRV_DATA_CONN_TIME;
+	}
+
 	if (stats[NL80211_STA_INFO_TX_BITRATE] &&
 	    nla_parse_nested(rate, NL80211_RATE_INFO_MAX,
 			     stats[NL80211_STA_INFO_TX_BITRATE],