iPXE
rarp.c
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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., 51 Franklin Street, Fifth Floor, Boston, MA
17  * 02110-1301, USA.
18  *
19  * You can also choose to distribute this program under the terms of
20  * the Unmodified Binary Distribution Licence (as given in the file
21  * COPYING.UBDL), provided that you have satisfied its requirements.
22  */
23 
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
25 
26 #include <stdint.h>
27 #include <byteswap.h>
28 #include <ipxe/netdevice.h>
29 #include <ipxe/iobuf.h>
30 #include <ipxe/if_ether.h>
31 #include <ipxe/rarp.h>
32 
33 /** @file
34  *
35  * Reverse Address Resolution Protocol
36  *
37  */
38 
39 /**
40  * Process incoming ARP packets
41  *
42  * @v iobuf I/O buffer
43  * @v netdev Network device
44  * @v ll_dest Link-layer destination address
45  * @v ll_source Link-layer source address
46  * @v flags Packet flags
47  * @ret rc Return status code
48  *
49  * This is a dummy method which simply discards RARP packets.
50  */
51 static int rarp_rx ( struct io_buffer *iobuf,
52  struct net_device *netdev __unused,
53  const void *ll_dest __unused,
54  const void *ll_source __unused,
55  unsigned int flags __unused ) {
56  free_iob ( iobuf );
57  return 0;
58 }
59 
60 
61 /**
62  * Transcribe RARP address
63  *
64  * @v net_addr RARP address
65  * @ret string "<RARP>"
66  *
67  * This operation is meaningless for the RARP protocol.
68  */
69 static const char * rarp_ntoa ( const void *net_addr __unused ) {
70  return "<RARP>";
71 }
72 
73 /** RARP protocol */
74 struct net_protocol rarp_protocol __net_protocol = {
75  .name = "RARP",
76  .net_proto = htons ( ETH_P_RARP ),
77  .rx = rarp_rx,
78  .ntoa = rarp_ntoa,
79 };
const char * name
Protocol name.
Definition: netdevice.h:66
I/O buffers.
void free_iob(struct io_buffer *iobuf)
Free I/O buffer.
Definition: iobuf.c:145
static int rarp_rx(struct io_buffer *iobuf, struct net_device *netdev __unused, const void *ll_dest __unused, const void *ll_source __unused, unsigned int flags __unused)
Process incoming ARP packets.
Definition: rarp.c:51
static struct net_device * netdev
Definition: gdbudp.c:52
Reverse Address Resolution Protocol.
A network device.
Definition: netdevice.h:348
static const char * rarp_ntoa(const void *net_addr __unused)
Transcribe RARP address.
Definition: rarp.c:69
A network-layer protocol.
Definition: netdevice.h:64
Network device management.
#define __unused
Declare a variable or data structure as unused.
Definition: compiler.h:573
struct net_protocol rarp_protocol __net_protocol
RARP protocol.
Definition: rarp.c:74
#define ETH_P_RARP
Definition: if_ether.h:20
#define htons(value)
Definition: byteswap.h:135
FILE_LICENCE(GPL2_OR_LATER_OR_UBDL)
A persistent I/O buffer.
Definition: iobuf.h:32
uint8_t flags
Flags.
Definition: ena.h:18