1 files changed, 142 insertions, 0 deletions
diff --git a/src/net/eap.c b/src/net/eap.c
new file mode 100644
index 0000000..8d1d540
--- /dev/null
+++ b/src/net/eap.c
@@ -0,0 +1,142 @@
+/*
+ * 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 netdev		Network device
+ * @ret rc		Return status code
+ */
+static int eap_rx_request_identity ( struct net_device *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 netdev		Network device
+ * @v req		EAP request
+ * @v len		Length of EAP request
+ * @ret rc		Return status code
+ */
+static int eap_rx_request ( struct net_device *netdev,
+			    const struct eap_request *req, size_t len ) {
+
+	/* Sanity check */
+	if ( len < sizeof ( *req ) ) {
+		DBGC ( netdev, "EAP %s underlength request:\n", netdev->name );
+		DBGC_HDA ( netdev, 0, req, len );
+		return -EINVAL;
+	}
+
+	/* Handle according to type */
+	switch ( req->type ) {
+	case EAP_TYPE_IDENTITY:
+		return eap_rx_request_identity ( netdev );
+	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 netdev		Network device
+ * @ret rc		Return status code
+ */
+static int eap_rx_success ( struct net_device *netdev ) {
+
+	/* Mark link as unblocked */
+	DBGC ( netdev, "EAP %s Success\n", netdev->name );
+	netdev_link_unblock ( netdev );
+
+	return 0;
+}
+
+/**
+ * Handle EAP Failure
+ *
+ * @v netdev		Network device
+ * @ret rc		Return status code
+ */
+static int eap_rx_failure ( struct net_device *netdev ) {
+
+	/* Record error */
+	DBGC ( netdev, "EAP %s Failure\n", netdev->name );
+	return -EPERM;
+}
+
+/**
+ * Handle EAP packet
+ *
+ * @v netdev		Network device
+ * @v data		EAP packet
+ * @v len		Length of EAP packet
+ * @ret rc		Return status code
+ */
+int eap_rx ( struct net_device *netdev, const void *data, size_t len ) {
+	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 ( netdev, &eap->req, len );
+	case EAP_CODE_SUCCESS:
+		return eap_rx_success ( netdev );
+	case EAP_CODE_FAILURE:
+		return eap_rx_failure ( netdev );
+	default:
+		DBGC ( netdev, "EAP %s unsupported code %d\n",
+		       netdev->name, eap->hdr.code );
+		DBGC_HDA ( netdev, 0, eap, len );
+		return -ENOTSUP;
+	}
+}