mac80211: Support receiving data frames on multiple vifs.

When using multiple STA interfaces on the same radio, some
data packets need to be received on all interfaces
(broadcast, for instance).

Make the STA loop look similar to the mgt-data loop.

Also, add logic to check RX_FLAG_MMIC_ERROR for last
interface in mgt-data loop.
Signed-off-by: Ben Greear <greearb@candelatech.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/rx.c

@@ -2609,7 +2609,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
 	int prepares;
 	struct ieee80211_sub_if_data *prev = NULL;
 	struct sk_buff *skb_new;
-	struct sta_info *sta, *tmp;
+	struct sta_info *sta, *tmp, *prev_sta;
 	bool found_sta = false;
 	int err = 0;
 
@@ -2640,22 +2640,74 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
 	ieee80211_verify_alignment(&rx);
 
 	if (ieee80211_is_data(fc)) {
+		prev_sta = NULL;
 		for_each_sta_info(local, hdr->addr2, sta, tmp) {
-			rx.sta = sta;
 			found_sta = true;
-			rx.sdata = sta->sdata;
+			if (!prev_sta) {
+				prev_sta = sta;
+				continue;
+			}
+
+			rx.sta = prev_sta;
+			rx.sdata = prev_sta->sdata;
 
 			rx.flags |= IEEE80211_RX_RA_MATCH;
 			prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
-			if (prepares) {
+			if (!prepares)
+				goto next_sta;
+
 			if (status->flag & RX_FLAG_MMIC_ERROR) {
 				if (rx.flags & IEEE80211_RX_RA_MATCH)
 					ieee80211_rx_michael_mic_report(hdr, &rx);
-				} else
-					prev = rx.sdata;
+				goto next_sta;
 			}
+
+			/*
+			 * frame was destined for the previous interface
+			 * so invoke RX handlers for it
+			 */
+			skb_new = skb_copy(skb, GFP_ATOMIC);
+			if (!skb_new) {
+				if (net_ratelimit())
+					wiphy_debug(local->hw.wiphy,
+						    "failed to copy multicast"
+						    " frame for %s\n",
+						    prev_sta->sdata->name);
+				goto next_sta;
+			}
+			ieee80211_invoke_rx_handlers(prev_sta->sdata, &rx,
+						     skb_new);
+next_sta:
+			prev_sta = sta;
+		} /* for all STA info */
+
+		if (prev_sta) {
+			rx.sta = prev_sta;
+			rx.sdata = prev_sta->sdata;
+
+			rx.flags |= IEEE80211_RX_RA_MATCH;
+			prepares = prepare_for_handlers(rx.sdata, &rx, hdr);
+			if (!prepares)
+				prev_sta = NULL;
+
+			if (prev_sta && status->flag & RX_FLAG_MMIC_ERROR) {
+				if (rx.flags & IEEE80211_RX_RA_MATCH)
+					ieee80211_rx_michael_mic_report(hdr, &rx);
+				prev_sta = NULL;
+			}
+		}
+
+
+		if (prev_sta) {
+			ieee80211_invoke_rx_handlers(prev_sta->sdata, &rx, skb);
+			return;
+		} else {
+			if (found_sta) {
+				dev_kfree_skb(skb);
+				return;
 			}
 		}
+	} /* if data frame */
 	if (!found_sta) {
 		list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 			if (!ieee80211_sdata_running(sdata))
@@ -2718,6 +2770,14 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
 
 			if (!prepares)
 				prev = NULL;
+
+			if (prev && status->flag & RX_FLAG_MMIC_ERROR) {
+				rx.sdata = prev;
+				if (rx.flags & IEEE80211_RX_RA_MATCH)
+					ieee80211_rx_michael_mic_report(hdr,
+									&rx);
+				prev = NULL;
+			}
 		}
 	}
 	if (prev)