nl80211: Provide access to STA TX/RX packet counters

The TX/RX packet counters are needed to fill in RADIUS Accounting
attributes Acct-Output-Packets and Acct-Input-Packets. We already
collect the needed information, but only the TX/RX bytes were
previously exposed through nl80211. Allow applications to fetch the
packet counters, too, to provide more complete support for accounting.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/linux/nl80211.h

@@ -526,6 +526,9 @@ enum nl80211_rate_info {
  * @NL80211_STA_INFO_SIGNAL: signal strength of last received PPDU (u8, dBm)
  * @NL80211_STA_INFO_TX_BITRATE: current unicast tx rate, nested attribute
  * 	containing info as possible, see &enum nl80211_sta_info_txrate.
+ * @NL80211_STA_INFO_RX_PACKETS: total received packet (u32, from this station)
+ * @NL80211_STA_INFO_TX_PACKETS: total transmitted packets (u32, to this
+ *	station)
  */
 enum nl80211_sta_info {
 	__NL80211_STA_INFO_INVALID,
@@ -537,6 +540,8 @@ enum nl80211_sta_info {
 	NL80211_STA_INFO_PLINK_STATE,
 	NL80211_STA_INFO_SIGNAL,
 	NL80211_STA_INFO_TX_BITRATE,
+	NL80211_STA_INFO_RX_PACKETS,
+	NL80211_STA_INFO_TX_PACKETS,
 
 	/* keep last */
 	__NL80211_STA_INFO_AFTER_LAST,

include/net/cfg80211.h

@@ -178,6 +178,8 @@ struct station_parameters {
  * @STATION_INFO_SIGNAL: @signal filled
  * @STATION_INFO_TX_BITRATE: @tx_bitrate fields are filled
  *  (tx_bitrate, tx_bitrate_flags and tx_bitrate_mcs)
+ * @STATION_INFO_RX_PACKETS: @rx_packets filled
+ * @STATION_INFO_TX_PACKETS: @tx_packets filled
  */
 enum station_info_flags {
 	STATION_INFO_INACTIVE_TIME	= 1<<0,
@@ -188,6 +190,8 @@ enum station_info_flags {
 	STATION_INFO_PLINK_STATE	= 1<<5,
 	STATION_INFO_SIGNAL		= 1<<6,
 	STATION_INFO_TX_BITRATE		= 1<<7,
+	STATION_INFO_RX_PACKETS		= 1<<8,
+	STATION_INFO_TX_PACKETS		= 1<<9,
 };
 
 /**
@@ -235,6 +239,8 @@ struct rate_info {
  * @plink_state: mesh peer link state
  * @signal: signal strength of last received packet in dBm
  * @txrate: current unicast bitrate to this station
+ * @rx_packets: packets received from this station
+ * @tx_packets: packets transmitted to this station
  */
 struct station_info {
 	u32 filled;
@@ -246,6 +252,8 @@ struct station_info {
 	u8 plink_state;
 	s8 signal;
 	struct rate_info txrate;
+	u32 rx_packets;
+	u32 tx_packets;
 };
 
 /**

net/mac80211/cfg.c

@@ -341,11 +341,15 @@ static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
 	sinfo->filled = STATION_INFO_INACTIVE_TIME |
 			STATION_INFO_RX_BYTES |
 			STATION_INFO_TX_BYTES |
+			STATION_INFO_RX_PACKETS |
+			STATION_INFO_TX_PACKETS |
 			STATION_INFO_TX_BITRATE;
 
 	sinfo->inactive_time = jiffies_to_msecs(jiffies - sta->last_rx);
 	sinfo->rx_bytes = sta->rx_bytes;
 	sinfo->tx_bytes = sta->tx_bytes;
+	sinfo->rx_packets = sta->rx_packets;
+	sinfo->tx_packets = sta->tx_packets;
 
 	if (sta->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
 		sinfo->filled |= STATION_INFO_SIGNAL;

net/wireless/nl80211.c

@@ -1206,6 +1206,12 @@ static int nl80211_send_station(struct sk_buff *msg, u32 pid, u32 seq,
 
 		nla_nest_end(msg, txrate);
 	}
+	if (sinfo->filled & STATION_INFO_RX_PACKETS)
+		NLA_PUT_U32(msg, NL80211_STA_INFO_RX_PACKETS,
+			    sinfo->rx_packets);
+	if (sinfo->filled & STATION_INFO_TX_PACKETS)
+		NLA_PUT_U32(msg, NL80211_STA_INFO_TX_PACKETS,
+			    sinfo->tx_packets);
 	nla_nest_end(msg, sinfoattr);
 
 	return genlmsg_end(msg, hdr);