src/net/rarp.c

   1 /*
   2  * Copyright (C) 2007 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 <stdint.h>
  20 #include <byteswap.h>
  21 #include <gpxe/netdevice.h>
  22 #include <gpxe/iobuf.h>
  23 #include <gpxe/if_ether.h>
  24 #include <gpxe/rarp.h>
  25
  26 /** @file
  27  *
  28  * Reverse Address Resolution Protocol
  29  *
  30  */
  31
  32 /**
  33  * Process incoming ARP packets
  34  *
  35  * @v iobuf             I/O buffer
  36  * @v netdev            Network device
  37  * @v ll_source         Link-layer source address
  38  * @ret rc              Return status code
  39  *
  40  * This is a dummy method which simply discards RARP packets.
  41  */
  42 static int rarp_rx ( struct io_buffer *iobuf,
  43                      struct net_device *netdev __unused,
  44                      const void *ll_source __unused ) {
  45         free_iob ( iobuf );
  46         return 0;
  47 }
  48
  49
  50 /**
  51  * Transcribe RARP address
  52  *
  53  * @v net_addr  RARP address
  54  * @ret string  "<RARP>"
  55  *
  56  * This operation is meaningless for the RARP protocol.
  57  */
  58 static const char * rarp_ntoa ( const void *net_addr __unused ) {
  59         return "<RARP>";
  60 }
  61
  62 /** RARP protocol */
  63 struct net_protocol rarp_protocol __net_protocol = {
  64         .name = "RARP",
  65         .net_proto = htons ( ETH_P_RARP ),
  66         .rx = rarp_rx,
  67         .ntoa = rarp_ntoa,
  68 };