source: bootcd/isolinux/syslinux-6.03/gpxe/src/net/netdev_settings.c

/*
 * Copyright (C) 2008 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <string.h>
#include <errno.h>
#include <byteswap.h>
#include <gpxe/dhcp.h>
#include <gpxe/settings.h>
#include <gpxe/device.h>
#include <gpxe/netdevice.h>

/** @file
 *
 * Network device configuration settings
 *
 */

/** Network device named settings */
struct setting mac_setting __setting = {
        .name = "mac",
        .description = "MAC address",
        .type = &setting_type_hex,
};
struct setting busid_setting __setting = {
        .name = "busid",
        .description = "Bus ID",
        .type = &setting_type_hex,
};

/**
 * Store value of network device setting
 *
 * @v settings          Settings block
 * @v setting           Setting to store
 * @v data              Setting data, or NULL to clear setting
 * @v len               Length of setting data
 * @ret rc              Return status code
 */
static int netdev_store ( struct settings *settings, struct setting *setting,
                          const void *data, size_t len ) {
        struct net_device *netdev = container_of ( settings, struct net_device,
                                                   settings.settings );

        if ( setting_cmp ( setting, &mac_setting ) == 0 ) {
                if ( len != netdev->ll_protocol->ll_addr_len )
                        return -EINVAL;
                memcpy ( netdev->ll_addr, data, len );
                return 0;
        }

        return generic_settings_store ( settings, setting, data, len );
}

/**
 * Fetch value of network device setting
 *
 * @v settings          Settings block
 * @v setting           Setting to fetch
 * @v data              Setting data, or NULL to clear setting
 * @v len               Length of setting data
 * @ret rc              Return status code
 */
static int netdev_fetch ( struct settings *settings, struct setting *setting,
                          void *data, size_t len ) {
        struct net_device *netdev = container_of ( settings, struct net_device,
                                                   settings.settings );
        struct device_description *desc = &netdev->dev->desc;
        struct dhcp_netdev_desc dhcp_desc;

        if ( setting_cmp ( setting, &mac_setting ) == 0 ) {
                if ( len > netdev->ll_protocol->ll_addr_len )
                        len = netdev->ll_protocol->ll_addr_len;
                memcpy ( data, netdev->ll_addr, len );
                return netdev->ll_protocol->ll_addr_len;
        }
        if ( setting_cmp ( setting, &busid_setting ) == 0 ) {
                dhcp_desc.type = desc->bus_type;
                dhcp_desc.vendor = htons ( desc->vendor );
                dhcp_desc.device = htons ( desc->device );
                if ( len > sizeof ( dhcp_desc ) )
                        len = sizeof ( dhcp_desc );
                memcpy ( data, &dhcp_desc, len );
                return sizeof ( dhcp_desc );
        }

        return generic_settings_fetch ( settings, setting, data, len );
}

/**
 * Clear network device settings
 *
 * @v settings          Settings block
 */
static void netdev_clear ( struct settings *settings ) {
        generic_settings_clear ( settings );
}

/** Network device configuration settings operations */
struct settings_operations netdev_settings_operations = {
        .store = netdev_store,
        .fetch = netdev_fetch,
        .clear = netdev_clear,
};