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 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 #include <string.h>
  22 #include <errno.h>
  23 #include <byteswap.h>
  24 #include <gpxe/dhcp.h>
  25 #include <gpxe/settings.h>
  26 #include <gpxe/device.h>
  27 #include <gpxe/netdevice.h>
  28
  29 /** @file
  30  *
  31  * Network device configuration settings
  32  *
  33  */
  34
  35 /** Network device named settings */
  36 struct setting mac_setting __setting = {
  37         .name = "mac",
  38         .description = "MAC address",
  39         .type = &setting_type_hex,
  40 };
  41 struct setting busid_setting __setting = {
  42         .name = "busid",
  43         .description = "Bus ID",
  44         .type = &setting_type_hex,
  45 };
  46
  47 /**
  48  * Store value of network device setting
  49  *
  50  * @v settings          Settings block
  51  * @v setting           Setting to store
  52  * @v data              Setting data, or NULL to clear setting
  53  * @v len               Length of setting data
  54  * @ret rc              Return status code
  55  */
  56 static int netdev_store ( struct settings *settings, struct setting *setting,
  57                           const void *data, size_t len ) {
  58         struct net_device *netdev = container_of ( settings, struct net_device,
  59                                                    settings.settings );
  60
  61         if ( setting_cmp ( setting, &mac_setting ) == 0 ) {
  62                 if ( len != netdev->ll_protocol->ll_addr_len )
  63                         return -EINVAL;
  64                 memcpy ( netdev->ll_addr, data, len );
  65                 return 0;
  66         }
  67
  68         return generic_settings_store ( settings, setting, data, len );
  69 }
  70
  71 /**
  72  * Fetch value of network device setting
  73  *
  74  * @v settings          Settings block
  75  * @v setting           Setting to fetch
  76  * @v data              Setting data, or NULL to clear setting
  77  * @v len               Length of setting data
  78  * @ret rc              Return status code
  79  */
  80 static int netdev_fetch ( struct settings *settings, struct setting *setting,
  81                           void *data, size_t len ) {
  82         struct net_device *netdev = container_of ( settings, struct net_device,
  83                                                    settings.settings );
  84         struct device_description *desc = &netdev->dev->desc;
  85         struct dhcp_netdev_desc dhcp_desc;
  86
  87         if ( setting_cmp ( setting, &mac_setting ) == 0 ) {
  88                 if ( len > netdev->ll_protocol->ll_addr_len )
  89                         len = netdev->ll_protocol->ll_addr_len;
  90                 memcpy ( data, netdev->ll_addr, len );
  91                 return netdev->ll_protocol->ll_addr_len;
  92         }
  93         if ( setting_cmp ( setting, &busid_setting ) == 0 ) {
  94                 dhcp_desc.type = desc->bus_type;
  95                 dhcp_desc.vendor = htons ( desc->vendor );
  96                 dhcp_desc.device = htons ( desc->device );
  97                 if ( len > sizeof ( dhcp_desc ) )
  98                         len = sizeof ( dhcp_desc );
  99                 memcpy ( data, &dhcp_desc, len );
 100                 return sizeof ( dhcp_desc );
 101         }
 102
 103         return generic_settings_fetch ( settings, setting, data, len );
 104 }
 105
 106 /**
 107  * Clear network device settings
 108  *
 109  * @v settings          Settings block
 110  */
 111 static void netdev_clear ( struct settings *settings ) {
 112         generic_settings_clear ( settings );
 113 }
 114
 115 /** Network device configuration settings operations */
 116 struct settings_operations netdev_settings_operations = {
 117         .store = netdev_store,
 118         .fetch = netdev_fetch,
 119         .clear = netdev_clear,
 120 };