1/**
2 * @file
3 * ARP protocol definitions
4 */
5
6/*
7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without modification,
11 * are permitted provided that the following conditions are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright notice,
14 *    this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright notice,
16 *    this list of conditions and the following disclaimer in the documentation
17 *    and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30 * OF SUCH DAMAGE.
31 *
32 * This file is part of the lwIP TCP/IP stack.
33 *
34 * Author: Adam Dunkels <adam@sics.se>
35 *
36 */
37#ifndef LWIP_HDR_PROT_ETHARP_H
38#define LWIP_HDR_PROT_ETHARP_H
39
40#include "lwip/arch.h"
41#include "lwip/prot/ethernet.h"
42#include "lwip/ip4_addr.h"
43
44#ifdef __cplusplus
45extern "C" {
46#endif
47
48#ifndef ETHARP_HWADDR_LEN
49#define ETHARP_HWADDR_LEN     ETH_HWADDR_LEN
50#endif
51
52#ifdef PACK_STRUCT_USE_INCLUDES
53#  include "arch/bpstruct.h"
54#endif
55PACK_STRUCT_BEGIN
56/** the ARP message, see RFC 826 ("Packet format") */
57struct etharp_hdr {
58  PACK_STRUCT_FIELD(u16_t hwtype);
59  PACK_STRUCT_FIELD(u16_t proto);
60  PACK_STRUCT_FLD_8(u8_t  hwlen);
61  PACK_STRUCT_FLD_8(u8_t  protolen);
62  PACK_STRUCT_FIELD(u16_t opcode);
63  PACK_STRUCT_FLD_S(struct eth_addr shwaddr);
64  PACK_STRUCT_FLD_S(struct ip4_addr2 sipaddr);
65  PACK_STRUCT_FLD_S(struct eth_addr dhwaddr);
66  PACK_STRUCT_FLD_S(struct ip4_addr2 dipaddr);
67} PACK_STRUCT_STRUCT;
68PACK_STRUCT_END
69#ifdef PACK_STRUCT_USE_INCLUDES
70#  include "arch/epstruct.h"
71#endif
72
73#define SIZEOF_ETHARP_HDR 28
74
75/* ARP hwtype values */
76enum etharp_hwtype {
77  HWTYPE_ETHERNET = 1
78  /* others not used */
79};
80
81/* ARP message types (opcodes) */
82enum etharp_opcode {
83  ARP_REQUEST = 1,
84  ARP_REPLY   = 2
85};
86
87#ifdef __cplusplus
88}
89#endif
90
91#endif /* LWIP_HDR_PROT_ETHARP_H */
92