gpxe/src/net/cachedhcp.c

   1 /*
   2  * Copyright (C) 2009 Joshua Oreman <oremanj@rwcr.net>.
   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 <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <gpxe/dhcp.h>
  25 #include <gpxe/dhcppkt.h>
  26 #include <gpxe/netdevice.h>
  27 #include <gpxe/iobuf.h>
  28 #include <gpxe/uaccess.h>
  29
  30 /** @file
  31  *
  32  * Cached DHCP packet handling
  33  *
  34  */
  35
  36 /**
  37  * Store cached DHCPACK packet
  38  *
  39  * @v data              User pointer to cached DHCP packet data
  40  * @v len               Length of cached DHCP packet data
  41  * @ret rc              Return status code
  42  *
  43  * This function should be called by the architecture-specific
  44  * get_cached_dhcpack() handler.
  45  */
  46 void store_cached_dhcpack ( userptr_t data, size_t len ) {
  47         struct dhcp_packet *dhcppkt;
  48         struct dhcphdr *dhcphdr;
  49         struct settings *parent;
  50         int rc;
  51
  52         /* Create DHCP packet */
  53         dhcppkt = zalloc ( sizeof ( *dhcppkt ) + len );
  54         if ( ! dhcppkt )
  55                 return;
  56
  57         /* Fill in data for DHCP packet */
  58         dhcphdr = ( ( ( void * ) dhcppkt ) + sizeof ( * dhcppkt ) );
  59         copy_from_user ( dhcphdr, data, 0, len );
  60         dhcppkt_init ( dhcppkt, dhcphdr, len );
  61         DBG_HD ( dhcppkt->options.data, dhcppkt->options.len );
  62
  63         /* Register settings on the last opened network device.
  64          * This will have the effect of registering cached settings
  65          * with a network device when "dhcp netX" is performed for that
  66          * device, which is usually what we want.
  67          */
  68         parent = netdev_settings ( last_opened_netdev() );
  69         if ( ( rc = register_settings ( &dhcppkt->settings, parent ) ) != 0 )
  70                 DBG ( "DHCP could not register cached settings: %s\n",
  71                       strerror ( rc ) );
  72
  73         dhcppkt_put ( dhcppkt );
  74
  75         DBG ( "DHCP registered cached settings\n" );
  76 }