[eap] Ignore any received EAP responses

EAP responses (including our own) may be broadcast by switches but are
not of interest to us and can be safely ignored if received.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/eap.h

@@ -26,6 +26,9 @@ struct eap_header {
 /** EAP request */
 #define EAP_CODE_REQUEST 1
 
+/** EAP response */
+#define EAP_CODE_RESPONSE 2
+
 /** EAP request */
 struct eap_request {
 	/** Header */

src/net/eap.c

@@ -149,6 +149,9 @@ int eap_rx ( struct eap_supplicant *supplicant, const void *data,
 	switch ( eap->hdr.code ) {
 	case EAP_CODE_REQUEST:
 		return eap_rx_request ( supplicant, &eap->req, len );
+	case EAP_CODE_RESPONSE:
+		DBGC2 ( netdev, "EAP %s ignoring response\n", netdev->name );
+		return 0;
 	case EAP_CODE_SUCCESS:
 		return eap_rx_success ( supplicant );
 	case EAP_CODE_FAILURE: