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 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 #include <stdint.h>
  22 #include <byteswap.h>
  23 #include <gpxe/netdevice.h>
  24 #include <gpxe/iobuf.h>
  25 #include <gpxe/if_ether.h>
  26 #include <gpxe/rarp.h>
  27
  28 /** @file
  29  *
  30  * Reverse Address Resolution Protocol
  31  *
  32  */
  33
  34 /**
  35  * Process incoming ARP packets
  36  *
  37  * @v iobuf             I/O buffer
  38  * @v netdev            Network device
  39  * @v ll_source         Link-layer source address
  40  * @ret rc              Return status code
  41  *
  42  * This is a dummy method which simply discards RARP packets.
  43  */
  44 static int rarp_rx ( struct io_buffer *iobuf,
  45                      struct net_device *netdev __unused,
  46                      const void *ll_source __unused ) {
  47         free_iob ( iobuf );
  48         return 0;
  49 }
  50
  51
  52 /**
  53  * Transcribe RARP address
  54  *
  55  * @v net_addr  RARP address
  56  * @ret string  "<RARP>"
  57  *
  58  * This operation is meaningless for the RARP protocol.
  59  */
  60 static const char * rarp_ntoa ( const void *net_addr __unused ) {
  61         return "<RARP>";
  62 }
  63
  64 /** RARP protocol */
  65 struct net_protocol rarp_protocol __net_protocol = {
  66         .name = "RARP",
  67         .net_proto = htons ( ETH_P_RARP ),
  68         .rx = rarp_rx,
  69         .ntoa = rarp_ntoa,
  70 };