[ipoib] Avoid unnecessary path record lookup for broadcast address
[ipxe.git] / 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., 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 };