gpxe/src/net/netdev_settings.c

   1 /*
   2  * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 #include <string.h>
  20 #include <errno.h>
  21 #include <gpxe/dhcp.h>
  22 #include <gpxe/settings.h>
  23 #include <gpxe/netdevice.h>
  24
  25 /** @file
  26  *
  27  * Network device configuration settings
  28  *
  29  */
  30
  31 /** Network device named settings */
  32 struct setting mac_setting __setting = {
  33         .name = "mac",
  34         .description = "MAC address",
  35         .type = &setting_type_hex,
  36 };
  37
  38 /**
  39  * Store value of network device setting
  40  *
  41  * @v settings          Settings block
  42  * @v setting           Setting to store
  43  * @v data              Setting data, or NULL to clear setting
  44  * @v len               Length of setting data
  45  * @ret rc              Return status code
  46  */
  47 static int netdev_store ( struct settings *settings, struct setting *setting,
  48                           const void *data, size_t len ) {
  49         struct net_device *netdev = container_of ( settings, struct net_device,
  50                                                    settings.settings );
  51
  52         if ( setting_cmp ( setting, &mac_setting ) == 0 ) {
  53                 if ( len != netdev->ll_protocol->ll_addr_len )
  54                         return -EINVAL;
  55                 memcpy ( netdev->ll_addr, data, len );
  56                 return 0;
  57         } else {
  58                 return simple_settings_store ( settings, setting, data, len );
  59         }
  60 }
  61
  62 /**
  63  * Fetch value of network device setting
  64  *
  65  * @v settings          Settings block
  66  * @v setting           Setting to fetch
  67  * @v data              Setting data, or NULL to clear setting
  68  * @v len               Length of setting data
  69  * @ret rc              Return status code
  70  */
  71 static int netdev_fetch ( struct settings *settings, struct setting *setting,
  72                           void *data, size_t len ) {
  73         struct net_device *netdev = container_of ( settings, struct net_device,
  74                                                    settings.settings );
  75
  76         if ( setting_cmp ( setting, &mac_setting ) == 0 ) {
  77                 if ( len > netdev->ll_protocol->ll_addr_len )
  78                         len = netdev->ll_protocol->ll_addr_len;
  79                 memcpy ( data, netdev->ll_addr, len );
  80                 return netdev->ll_protocol->ll_addr_len;
  81         } else {
  82                 return simple_settings_fetch ( settings, setting, data, len );
  83         }
  84 }
  85
  86 /** Network device configuration settings operations */
  87 struct settings_operations netdev_settings_operations = {
  88         .store = netdev_store,
  89         .fetch = netdev_fetch,
  90 };