mac80211: redirect EAP frames on AP VLAN interfaces to the main AP interface to fix a bridging related race condition

SVN-Revision: 26016

package/mac80211/patches/580-mac80211_redirect_vlan_eap_frames.patch

@@ -0,0 +1,67 @@
+--- a/net/mac80211/rx.c
++++ b/net/mac80211/rx.c
+@@ -1582,7 +1582,7 @@ ieee80211_drop_unencrypted_mgmt(struct i
+ }
+ 
+ static int
+-__ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
++__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
+ {
+ 	struct ieee80211_sub_if_data *sdata = rx->sdata;
+ 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+@@ -1590,6 +1590,7 @@ __ieee80211_data_to_8023(struct ieee8021
+ 	struct ethhdr *ehdr;
+ 	int ret;
+ 
++	*port_control = false;
+ 	if (ieee80211_has_a4(hdr->frame_control) &&
+ 	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
+ 		return -1;
+@@ -1608,11 +1609,14 @@ __ieee80211_data_to_8023(struct ieee8021
+ 		return -1;
+ 
+ 	ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
+-	if (ret < 0 || !check_port_control)
++	if (ret < 0)
+ 		return ret;
+ 
+ 	ehdr = (struct ethhdr *) rx->skb->data;
+-	if (ehdr->h_proto != rx->sdata->control_port_protocol)
++	if (ehdr->h_proto == rx->sdata->control_port_protocol)
++		*port_control = true;
++
++	if (check_port_control && !*port_control)
+ 		return -1;
+ 
+ 	return 0;
+@@ -1913,6 +1917,7 @@ ieee80211_rx_h_data(struct ieee80211_rx_
+ 	struct net_device *dev = sdata->dev;
+ 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+ 	__le16 fc = hdr->frame_control;
++	bool port_control;
+ 	int err;
+ 
+ 	if (unlikely(!ieee80211_is_data(hdr->frame_control)))
+@@ -1929,13 +1934,21 @@ ieee80211_rx_h_data(struct ieee80211_rx_
+ 	    sdata->vif.type == NL80211_IFTYPE_AP)
+ 		return RX_DROP_MONITOR;
+ 
+-	err = __ieee80211_data_to_8023(rx);
++	err = __ieee80211_data_to_8023(rx, &port_control);
+ 	if (unlikely(err))
+ 		return RX_DROP_UNUSABLE;
+ 
+ 	if (!ieee80211_frame_allowed(rx, fc))
+ 		return RX_DROP_MONITOR;
+ 
++	if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
++	    unlikely(port_control) && sdata->bss) {
++		sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
++				     u.ap);
++		dev = sdata->dev;
++		rx->sdata = sdata;
++	}
++
+ 	rx->skb->dev = dev;
+ 
+ 	dev->stats.rx_packets++;