mac80211: avoid reflecting frames back to the client

I'm not really sure exactly _why_ I've been carrying a note
for what's probably _years_ to check that we don't do this,
but we clearly do reflect frames back to the station itself
if it sends such.

One way or the other, it's useless since the station doesn't
really need the AP to talk to itself, so suppress it.

While at it, clarify some of the logic by removing skb->data
references in favour of the destination address (pointer) we
already have separately.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/rx.c

@@ -2458,8 +2458,9 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
 			if (!xmit_skb)
 				net_info_ratelimited("%s: failed to clone multicast frame\n",
 						    dev->name);
-		} else if (!is_multicast_ether_addr(ehdr->h_dest)) {
-			dsta = sta_info_get(sdata, skb->data);
+		} else if (!is_multicast_ether_addr(ehdr->h_dest) &&
+			   !ether_addr_equal(ehdr->h_dest, ehdr->h_source)) {
+			dsta = sta_info_get(sdata, ehdr->h_dest);
 			if (dsta) {
 				/*
 				 * The destination station is associated to
@@ -4240,11 +4241,10 @@ static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
 
 	if (fast_rx->internal_forward) {
 		struct sk_buff *xmit_skb = NULL;
-		bool multicast = is_multicast_ether_addr(skb->data);
-
-		if (multicast) {
+		if (is_multicast_ether_addr(addrs.da)) {
 			xmit_skb = skb_copy(skb, GFP_ATOMIC);
-		} else if (sta_info_get(rx->sdata, skb->data)) {
+		} else if (!ether_addr_equal(addrs.da, addrs.sa) &&
+			   sta_info_get(rx->sdata, addrs.da)) {
 			xmit_skb = skb;
 			skb = NULL;
 		}