mac80211: support NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211_MAC_ADDRS

This is now a trivial patch, but for seeing the actual changes
I (Johannes) split it out from the original.
Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
Link: https://lore.kernel.org/r/20200115125522.3755-1-markus.theil@tu-ilmenau.de
[split into separate cfg80211/mac80211 patches]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/main.c

@@ -587,6 +587,8 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_STA);
 	wiphy_ext_feature_set(wiphy,
 			      NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211);
+	wiphy_ext_feature_set(wiphy,
+			      NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211_MAC_ADDRS);
 
 	if (!ops->hw_scan) {
 		wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |

net/mac80211/tx.c

@@ -5317,7 +5317,7 @@ int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
 
 	ehdr = skb_push(skb, sizeof(struct ethhdr));
 	memcpy(ehdr->h_dest, dest, ETH_ALEN);
-	memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
+	memcpy(ehdr->h_source, src, ETH_ALEN);
 	ehdr->h_proto = proto;
 
 	skb->dev = dev;