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 */
rarp_rx(struct io_buffer * iobuf,struct net_device * netdev __unused,const void * ll_source __unused)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 */
rarp_ntoa(const void * net_addr __unused)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 };
71