__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;
	bool check_port_control = false;
	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;

	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
	    !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {

		if (!sdata->u.mgd.use_4addr)
			return -1;
		else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
			check_port_control = true;
	}

	if (is_multicast_ether_addr(hdr->addr1) &&
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
		return -1;

	ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
	if (ret < 0)
		return ret;

	ehdr = (struct ethhdr *) rx->skb->data;
	if (ehdr->h_proto == rx->sdata->control_port_protocol)
		*port_control = true;
	else if (check_port_control)
		return -1;

	return 0;
}
Unknown