[PATCH v2 wireless-next 14/15] wifi: mac80211: report and drop spurious NAN Data frames

[Miri Korenblit <miriam.rachel.korenblit@intel.com>]

According to Wi-Fi Aware (TM) 4.0 specification 6.2.5, in case a frame
is recevied from an address that doesn't belong to any active NDP, the
frame should be dropped and a NAN Data Path Termination should be sent
to the transmitter.
Do it by dropping the frame and calling cfg80211_rx_spurious_frame in
that case.

Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
---
 net/mac80211/rx.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 979ac26d1173..3e5d1c47a5b0 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1589,6 +1589,25 @@ ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
 	if (ieee80211_vif_is_mesh(&rx->sdata->vif))
 		return ieee80211_rx_mesh_check(rx);
 
+	/*
+	 * Wi-Fi Aware (TM) 4.0 specification 6.2.5:
+	 * For NAN_DATA, unicast data frames must have A2 (source)
+	 * assigned to an active NDP. If not the frame must be dropped
+	 * and NAN Data Path termination frame should be sent. Notify
+	 * user space so it can do so.
+	 */
+	if (rx->sdata->vif.type == NL80211_IFTYPE_NAN_DATA) {
+		if (ieee80211_is_data(hdr->frame_control) &&
+		    !is_multicast_ether_addr(hdr->addr1) &&
+		    (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC))) {
+			if (cfg80211_rx_spurious_frame(rx->sdata->dev, hdr->addr2,
+						       rx->link_id, GFP_ATOMIC))
+				return RX_DROP_U_SPURIOUS_NOTIF;
+			return RX_DROP_U_SPURIOUS;
+		}
+		return RX_CONTINUE;
+	}
+
 	if (unlikely((ieee80211_is_data(hdr->frame_control) ||
 		      ieee80211_is_pspoll(hdr->frame_control)) &&
 		     rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
-- 
2.34.1