hostapd: add OpenWrt specific statistic counters

This adds a new struct for storing statistics not (yet) tracked by
hostapd regarding RRM and WNM activity.

These statistics can be read using the get_status hostapd interface ubus
method.

Signed-off-by: David Bauer <mail@david-bauer.net>

package/network/services/hostapd/patches/590-rrm-wnm-statistics.patch

@@ -0,0 +1,92 @@
+--- a/src/ap/hostapd.h
++++ b/src/ap/hostapd.h
+@@ -441,6 +441,21 @@ struct hostapd_sta_info {
+ };
+ 
+ /**
++ * struct hostapd_openwrt_stats - OpenWrt custom STA/AP statistics
++ */
++struct hostapd_openwrt_stats {
++	struct {
++		u64 neighbor_report_tx;
++	} rrm;
++
++	struct {
++		u64 bss_transition_query_rx;
++		u64 bss_transition_request_tx;
++		u64 bss_transition_response_rx;
++	} wnm;
++};
++
++/**
+  * struct hostapd_iface - hostapd per-interface data structure
+  */
+ struct hostapd_iface {
+@@ -562,6 +577,9 @@ struct hostapd_iface {
+ 	u64 last_channel_time_busy;
+ 	u8 channel_utilization;
+ 
++	/* OpenWrt specific statistics */
++	struct hostapd_openwrt_stats openwrt_stats;
++
+ 	unsigned int chan_util_samples_sum;
+ 	unsigned int chan_util_num_sample_periods;
+ 	unsigned int chan_util_average;
+--- a/src/ap/wnm_ap.c
++++ b/src/ap/wnm_ap.c
+@@ -386,6 +386,7 @@ static int ieee802_11_send_bss_trans_mgm
+ 	mgmt->u.action.u.bss_tm_req.validity_interval = 1;
+ 	pos = mgmt->u.action.u.bss_tm_req.variable;
+ 
++	hapd->iface->openwrt_stats.wnm.bss_transition_request_tx++;
+ 	wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Request to "
+ 		   MACSTR " dialog_token=%u req_mode=0x%x disassoc_timer=%u "
+ 		   "validity_interval=%u",
+@@ -646,10 +647,12 @@ int ieee802_11_rx_wnm_action_ap(struct h
+ 
+ 	switch (action) {
+ 	case WNM_BSS_TRANS_MGMT_QUERY:
++		hapd->iface->openwrt_stats.wnm.bss_transition_query_rx++;
+ 		ieee802_11_rx_bss_trans_mgmt_query(hapd, mgmt->sa, payload,
+ 						   plen);
+ 		return 0;
+ 	case WNM_BSS_TRANS_MGMT_RESP:
++		hapd->iface->openwrt_stats.wnm.bss_transition_response_rx++;
+ 		ieee802_11_rx_bss_trans_mgmt_resp(hapd, mgmt->sa, payload,
+ 						  plen);
+ 		return 0;
+@@ -696,6 +699,7 @@ int wnm_send_disassoc_imminent(struct ho
+ 
+ 	pos = mgmt->u.action.u.bss_tm_req.variable;
+ 
++	hapd->iface->openwrt_stats.wnm.bss_transition_request_tx++;
+ 	wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Request frame to indicate imminent disassociation (disassoc_timer=%d) to "
+ 		   MACSTR, disassoc_timer, MAC2STR(sta->addr));
+ 	if (hostapd_drv_send_mlme(hapd, buf, pos - buf, 0, NULL, 0, 0) < 0) {
+@@ -777,6 +781,7 @@ int wnm_send_ess_disassoc_imminent(struc
+ 		return -1;
+ 	}
+ 
++	hapd->iface->openwrt_stats.wnm.bss_transition_request_tx++;
+ 	if (disassoc_timer) {
+ 		/* send disassociation frame after time-out */
+ 		set_disassoc_timer(hapd, sta, disassoc_timer);
+@@ -856,6 +861,7 @@ int wnm_send_bss_tm_req(struct hostapd_d
+ 	}
+ 	os_free(buf);
+ 
++	hapd->iface->openwrt_stats.wnm.bss_transition_request_tx++;
+ 	if (disassoc_timer) {
+ 		/* send disassociation frame after time-out */
+ 		set_disassoc_timer(hapd, sta, disassoc_timer);
+--- a/src/ap/rrm.c
++++ b/src/ap/rrm.c
+@@ -269,6 +269,8 @@ static void hostapd_send_nei_report_resp
+ 		}
+ 	}
+ 
++	hapd->iface->openwrt_stats.rrm.neighbor_report_tx++;
++
+ 	hostapd_drv_send_action(hapd, hapd->iface->freq, 0, addr,
+ 				wpabuf_head(buf), wpabuf_len(buf));
+ 	wpabuf_free(buf);

package/network/services/hostapd/src/src/ap/ubus.c

@@ -406,7 +406,7 @@ hostapd_bss_get_status(struct ubus_context *ctx, struct ubus_object *obj,
 		       struct blob_attr *msg)
 {
 	struct hostapd_data *hapd = container_of(obj, struct hostapd_data, ubus.obj);
-	void *airtime_table, *dfs_table;
+	void *airtime_table, *dfs_table, *rrm_table, *wnm_table;
 	struct os_reltime now;
 	char ssid[SSID_MAX_LEN + 1];
 	char phy_name[17];
@@ -430,6 +430,18 @@ hostapd_bss_get_status(struct ubus_context *ctx, struct ubus_object *obj,
 	snprintf(phy_name, 17, "%s", hapd->iface->phy);
 	blobmsg_add_string(&b, "phy", phy_name);
 
+	/* RRM */
+	rrm_table = blobmsg_open_table(&b, "rrm");
+	blobmsg_add_u64(&b, "neighbor_report_tx", hapd->iface->openwrt_stats.rrm.neighbor_report_tx);
+	blobmsg_close_table(&b, rrm_table);
+
+	/* WNM */
+	wnm_table = blobmsg_open_table(&b, "wnm");
+	blobmsg_add_u64(&b, "bss_transition_query_rx", hapd->iface->openwrt_stats.wnm.bss_transition_query_rx);
+	blobmsg_add_u64(&b, "bss_transition_request_tx", hapd->iface->openwrt_stats.wnm.bss_transition_request_tx);
+	blobmsg_add_u64(&b, "bss_transition_response_rx", hapd->iface->openwrt_stats.wnm.bss_transition_response_rx);
+	blobmsg_close_table(&b, rrm_table);
+
 	/* Airtime */
 	airtime_table = blobmsg_open_table(&b, "airtime");
 	blobmsg_add_u64(&b, "time", hapd->iface->last_channel_time);