wifi: mac80211: Allow EAPOL frames from link addresses

Allow transmitting EAPOL frames not only from the interface
address (which is the MLD address) but also any link addresses,
in order to support non-MLO stations on AP interfaces.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/rx.c

@@ -2532,6 +2532,35 @@ __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
 	return 0;
 }
 
+static bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata,
+				  const u8 *addr, int *out_link_id)
+{
+	unsigned int link_id;
+
+	/* non-MLO, or MLD address replaced by hardware */
+	if (ether_addr_equal(sdata->vif.addr, addr))
+		return true;
+
+	if (!sdata->vif.valid_links)
+		return false;
+
+	for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) {
+		struct ieee80211_bss_conf *conf;
+
+		conf = rcu_dereference(sdata->vif.link_conf[link_id]);
+
+		if (!conf)
+			continue;
+		if (ether_addr_equal(conf->addr, addr)) {
+			if (out_link_id)
+				*out_link_id = link_id;
+			return true;
+		}
+	}
+
+	return false;
+}
+
 /*
  * requires that rx->skb is a frame with ethernet header
  */
@@ -2547,7 +2576,7 @@ static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
 	 * all other destination addresses for them.
 	 */
 	if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol))
-		return ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
+		return ieee80211_is_our_addr(rx->sdata, ehdr->h_dest, NULL) ||
 		       ether_addr_equal(ehdr->h_dest, pae_group_addr);
 
 	if (ieee80211_802_1x_port_control(rx) ||
@@ -4143,35 +4172,6 @@ static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
 	       is_broadcast_ether_addr(raddr);
 }
 
-static bool ieee80211_is_our_addr(struct ieee80211_sub_if_data *sdata,
-				  const u8 *addr, int *out_link_id)
-{
-	unsigned int link_id;
-
-	/* non-MLO, or MLD address replaced by hardware */
-	if (ether_addr_equal(sdata->vif.addr, addr))
-		return true;
-
-	if (!sdata->vif.valid_links)
-		return false;
-
-	for (link_id = 0; link_id < ARRAY_SIZE(sdata->vif.link_conf); link_id++) {
-		struct ieee80211_bss_conf *conf;
-
-		conf = rcu_dereference(sdata->vif.link_conf[link_id]);
-
-		if (!conf)
-			continue;
-		if (ether_addr_equal(conf->addr, addr)) {
-			if (out_link_id)
-				*out_link_id = link_id;
-			return true;
-		}
-	}
-
-	return false;
-}
-
 static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
 {
 	struct ieee80211_sub_if_data *sdata = rx->sdata;