mac80211: receive EAP frames from a station in an AP VLAN on the main AP

This makes it easier to handle moving stations to VLAN interfaces that are
part of a different bridge.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 359fc39..54858a6 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1586,7 +1586,7 @@ ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
 }
 
 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;
@@ -1594,6 +1594,7 @@ __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
        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;
@@ -1612,11 +1613,13 @@ __ieee80211_data_to_8023(struct ieee80211_rx_data *rx)
                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;
+       else if (check_port_control)
                return -1;
 
        return 0;
@@ -1917,6 +1920,7 @@ ieee80211_rx_h_data(struct ieee80211_rx_data *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)))
@@ -1933,13 +1937,21 @@ ieee80211_rx_h_data(struct ieee80211_rx_data *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++;