nl80211: More complete processing of connection quality monitor events

This adds processing of beacon loss events and generation of an internal
EVENT_BEACON_LOSS event based on them for wpa_supplicant processing. In
addition, number of consecutively lost (not acknowledged) packets is now
reported and TXE events are noted in the debug log.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/drivers/driver.h

@@ -1,6 +1,6 @@
 /*
  * Driver interface definition
- * Copyright (c) 2003-2015, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2003-2017, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -4228,6 +4228,15 @@ enum wpa_event_type {
 	 * EVENT_P2P_LO_STOP - Notify that P2P listen offload is stopped
 	 */
 	EVENT_P2P_LO_STOP,
+
+	/**
+	 * EVENT_BEACON_LOSS - Beacon loss detected
+	 *
+	 * This event indicates that no Beacon frames has been received from
+	 * the current AP. This may indicate that the AP is not anymore in
+	 * range.
+	 */
+	EVENT_BEACON_LOSS,
 };
 
 
@@ -4817,9 +4826,12 @@ union wpa_event_data {
 	/**
 	 * struct low_ack - Data for EVENT_STATION_LOW_ACK events
 	 * @addr: station address
+	 * @num_packets: Number of packets lost (consecutive packets not
+	 * acknowledged)
 	 */
 	struct low_ack {
 		u8 addr[ETH_ALEN];
+		u32 num_packets;
 	} low_ack;
 
 	/**

src/drivers/driver_common.c

@@ -1,6 +1,6 @@
 /*
  * Common driver-related functions
- * Copyright (c) 2003-2011, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2003-2017, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -81,6 +81,7 @@ const char * event_to_string(enum wpa_event_type event)
 	E2S(ACS_CHANNEL_SELECTED);
 	E2S(DFS_CAC_STARTED);
 	E2S(P2P_LO_STOP);
+	E2S(BEACON_LOSS);
 	}
 
 	return "UNKNOWN";

src/drivers/driver_nl80211_event.c

@@ -1,6 +1,6 @@
 /*
  * Driver interaction with Linux nl80211/cfg80211 - Event processing
- * Copyright (c) 2002-2014, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2002-2017, Jouni Malinen <j@w1.fi>
  * Copyright (c) 2007, Johannes Berg <johannes@sipsolutions.net>
  * Copyright (c) 2009-2010, Atheros Communications
  *
@@ -1132,6 +1132,10 @@ static void nl80211_cqm_event(struct wpa_driver_nl80211_data *drv,
 		[NL80211_ATTR_CQM_RSSI_HYST] = { .type = NLA_U8 },
 		[NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT] = { .type = NLA_U32 },
 		[NL80211_ATTR_CQM_PKT_LOSS_EVENT] = { .type = NLA_U32 },
+		[NL80211_ATTR_CQM_TXE_RATE] = { .type = NLA_U32 },
+		[NL80211_ATTR_CQM_TXE_PKTS] = { .type = NLA_U32 },
+		[NL80211_ATTR_CQM_TXE_INTVL] = { .type = NLA_U32 },
+		[NL80211_ATTR_CQM_BEACON_LOSS_EVENT] = { .type = NLA_FLAG },
 	};
 	struct nlattr *cqm[NL80211_ATTR_CQM_MAX + 1];
 	enum nl80211_cqm_rssi_threshold_event event;
@@ -1153,12 +1157,39 @@ static void nl80211_cqm_event(struct wpa_driver_nl80211_data *drv,
 			return;
 		os_memcpy(ed.low_ack.addr, nla_data(tb[NL80211_ATTR_MAC]),
 			  ETH_ALEN);
+		ed.low_ack.num_packets =
+			nla_get_u32(cqm[NL80211_ATTR_CQM_PKT_LOSS_EVENT]);
+		wpa_printf(MSG_DEBUG, "nl80211: Packet loss event for " MACSTR
+			   " (num_packets %u)",
+			   MAC2STR(ed.low_ack.addr), ed.low_ack.num_packets);
 		wpa_supplicant_event(drv->ctx, EVENT_STATION_LOW_ACK, &ed);
 		return;
 	}
 
-	if (cqm[NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT] == NULL)
+	if (cqm[NL80211_ATTR_CQM_BEACON_LOSS_EVENT]) {
+		wpa_printf(MSG_DEBUG, "nl80211: Beacon loss event");
+		wpa_supplicant_event(drv->ctx, EVENT_BEACON_LOSS, NULL);
 		return;
+	}
+
+	if (cqm[NL80211_ATTR_CQM_TXE_RATE] &&
+	    cqm[NL80211_ATTR_CQM_TXE_PKTS] &&
+	    cqm[NL80211_ATTR_CQM_TXE_INTVL] &&
+	    cqm[NL80211_ATTR_MAC]) {
+		wpa_printf(MSG_DEBUG, "nl80211: CQM TXE event for " MACSTR
+			   " (rate: %u pkts: %u interval: %u)",
+			   MAC2STR((u8 *) nla_data(cqm[NL80211_ATTR_MAC])),
+			   nla_get_u32(cqm[NL80211_ATTR_CQM_TXE_RATE]),
+			   nla_get_u32(cqm[NL80211_ATTR_CQM_TXE_PKTS]),
+			   nla_get_u32(cqm[NL80211_ATTR_CQM_TXE_INTVL]));
+		return;
+	}
+
+	if (cqm[NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT] == NULL) {
+		wpa_printf(MSG_DEBUG,
+			   "nl80211: Not a CQM RSSI threshold event");
+		return;
+	}
 	event = nla_get_u32(cqm[NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT]);
 
 	if (event == NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH) {
@@ -1169,8 +1200,12 @@ static void nl80211_cqm_event(struct wpa_driver_nl80211_data *drv,
 		wpa_printf(MSG_DEBUG, "nl80211: Connection quality monitor "
 			   "event: RSSI low");
 		ed.signal_change.above_threshold = 0;
-	} else
+	} else {
+		wpa_printf(MSG_DEBUG,
+			   "nl80211: Unknown CQM RSSI threshold event: %d",
+			   event);
 		return;
+	}
 
 	res = nl80211_get_link_signal(drv, &sig);
 	if (res == 0) {