Removed empty EAPOL-key message send after 4WH completion to nodes on relay

Author: Mika Leppänen

CHANGELOG.md

@@ -12,6 +12,7 @@
 
 ### Bug fixes
 * Added ignoring of retry messages from RADIUS server when waiting EAP-TLS
+* Removed empty EAPOL-key message send after 4WH completion to nodes on relay
 
 
 ## Release v13.0.0 (15-04-2021)

source/6LoWPAN/ws/ws_eapol_auth_relay.c

@@ -165,6 +165,13 @@ static void ws_eapol_auth_relay_socket_cb(void *cb)
         eui_64 = ptr;
         ptr += 8;
         uint16_t data_len = cb_data->d_len - 26;
+        /* If EAPOL PDU data length is zero (message contains only supplicant EUI-64 and KMP ID)
+         * i.e. is purge message and is not going to authenticator local relay then ignores message
+         */
+        if (data_len == 1 && !addr_ipv6_equal(relay_ip_addr.address, eapol_auth_relay->relay_addr.address)) {
+            ns_dyn_mem_free(socket_pdu);
+            return;
+        }
         ws_eapol_relay_lib_send_to_relay(eapol_auth_relay->socket_id, eui_64, &relay_ip_addr,
                                          ptr, data_len);
         ns_dyn_mem_free(socket_pdu);