/*
* Copyright (C) 2021 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <errno.h>
#include <ipxe/netdevice.h>
#include <ipxe/eap.h>
/** @file
*
* Extensible Authentication Protocol
*
*/
/**
* Handle EAP Request-Identity
*
* @v supplicant EAP supplicant
* @ret rc Return status code
*/
static int eap_rx_request_identity ( struct eap_supplicant *supplicant ) {
struct net_device *netdev = supplicant->netdev;
/* Treat Request-Identity as blocking the link */
DBGC ( netdev, "EAP %s Request-Identity blocking link\n",
netdev->name );
netdev_link_block ( netdev, EAP_BLOCK_TIMEOUT );
return 0;
}
/**
* Handle EAP Request
*
* @v supplicant EAP supplicant
* @v req EAP request
* @v len Length of EAP request
* @ret rc Return status code
*/
static int eap_rx_request ( struct eap_supplicant *supplicant,
const struct eap_request *req, size_t len ) {
struct net_device *netdev = supplicant->netdev;
/* Sanity check */
if ( len < sizeof ( *req ) ) {
DBGC ( netdev, "EAP %s underlength request:\n", netdev->name );
DBGC_HDA ( netdev, 0, req, len );
return -EINVAL;
}
/* Mark authentication as incomplete */
supplicant->done = 0;
/* Handle according to type */
switch ( req->type ) {
case EAP_TYPE_IDENTITY:
return eap_rx_request_identity ( supplicant );
default:
DBGC ( netdev, "EAP %s requested type %d unknown:\n",
netdev->name, req->type );
DBGC_HDA ( netdev, 0, req, len );
return -ENOTSUP;
}
}
/**
* Handle EAP Success
*
* @v supplicant EAP supplicant
* @ret rc Return status code
*/
static int eap_rx_success ( struct eap_supplicant *supplicant ) {
struct net_device *netdev = supplicant->netdev;
/* Mark authentication as complete */
supplicant->done = 1;
/* Mark link as unblocked */
DBGC ( netdev, "EAP %s Success\n", netdev->name );
netdev_link_unblock ( netdev );
return 0;
}
/**
* Handle EAP Failure
*
* @v supplicant EAP supplicant
* @ret rc Return status code
*/
static int eap_rx_failure ( struct eap_supplicant *supplicant ) {
struct net_device *netdev = supplicant->netdev;
/* Mark authentication as complete */
supplicant->done = 1;
/* Record error */
DBGC ( netdev, "EAP %s Failure\n", netdev->name );
return -EPERM;
}
/**
* Handle EAP packet
*
* @v supplicant EAP supplicant
* @v data EAP packet
* @v len Length of EAP packet
* @ret rc Return status code
*/
int eap_rx ( struct eap_supplicant *supplicant, const void *data,
size_t len ) {
struct net_device *netdev = supplicant->netdev;
const union eap_packet *eap = data;
/* Sanity check */
if ( len < sizeof ( eap->hdr ) ) {
DBGC ( netdev, "EAP %s underlength header:\n", netdev->name );
DBGC_HDA ( netdev, 0, eap, len );
return -EINVAL;
}
/* Handle according to code */
switch ( eap->hdr.code ) {
case EAP_CODE_REQUEST:
return eap_rx_request ( supplicant, &eap->req, len );
case EAP_CODE_SUCCESS:
return eap_rx_success ( supplicant );
case EAP_CODE_FAILURE:
return eap_rx_failure ( supplicant );
default:
DBGC ( netdev, "EAP %s unsupported code %d\n",
netdev->name, eap->hdr.code );
DBGC_HDA ( netdev, 0, eap, len );
return -ENOTSUP;
}
}
