mac80211: implement multicast forwarding on fast-RX path

commit eeb0d56fab4cd7848cf2be6704fa48900dbc1381 upstream.

In AP (or VLAN) mode, when unicast 802.11 packets are received,
they might actually be multicast after conversion. In this case
the fast-RX path didn't handle them properly to send them back
to the wireless medium. Implement that by copying the SKB and
sending it back out.

The possible alternative would be to just punt the packet back
to the regular (slow) RX path, but since we have almost all of
the required code here already it's not so complicated to add
here. Punting it back would also mean acquiring the spinlock,
which would be bad for the stated purpose of the fast-RX path,
to enable well-performing parallel RX.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 18 insertions, 8 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index a47bbc973f2d..2384b4aae064 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3939,21 +3939,31 @@ static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
         u64_stats_update_end(&stats->syncp);
 
         if (fast_rx->internal_forward) {
-                struct sta_info *dsta = sta_info_get(rx->sdata, skb->data);
+                struct sk_buff *xmit_skb = NULL;
+                bool multicast = is_multicast_ether_addr(skb->data);
 
-                if (dsta) {
+                if (multicast) {
+                        xmit_skb = skb_copy(skb, GFP_ATOMIC);
+                } else if (sta_info_get(rx->sdata, skb->data)) {
+                        xmit_skb = skb;
+                        skb = NULL;
+                }
+
+                if (xmit_skb) {
                         /*
                          * Send to wireless media and increase priority by 256
                          * to keep the received priority instead of
                          * reclassifying the frame (see cfg80211_classify8021d).
                          */
-                        skb->priority += 256;
-                        skb->protocol = htons(ETH_P_802_3);
-                        skb_reset_network_header(skb);
-                        skb_reset_mac_header(skb);
-                        dev_queue_xmit(skb);
-                        return true;
+                        xmit_skb->priority += 256;
+                        xmit_skb->protocol = htons(ETH_P_802_3);
+                        skb_reset_network_header(xmit_skb);
+                        skb_reset_mac_header(xmit_skb);
+                        dev_queue_xmit(xmit_skb);
                 }
+
+                if (!skb)
+                        return true;
         }
 
         /* deliver to local stack */