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 |
|
---|
43 | #ifdef __cplusplus
|
---|
44 | extern "C" {
|
---|
45 | #endif
|
---|
46 |
|
---|
47 | #ifndef ETHARP_HWADDR_LEN
|
---|
48 | #define ETHARP_HWADDR_LEN ETH_HWADDR_LEN
|
---|
49 | #endif
|
---|
50 |
|
---|
51 | /**
|
---|
52 | * struct ip4_addr_wordaligned is used in the definition of the ARP packet format in
|
---|
53 | * order to support compilers that don't have structure packing.
|
---|
54 | */
|
---|
55 | #ifdef PACK_STRUCT_USE_INCLUDES
|
---|
56 | # include "arch/bpstruct.h"
|
---|
57 | #endif
|
---|
58 | PACK_STRUCT_BEGIN
|
---|
59 | struct ip4_addr_wordaligned {
|
---|
60 | PACK_STRUCT_FIELD(u16_t addrw[2]);
|
---|
61 | } PACK_STRUCT_STRUCT;
|
---|
62 | PACK_STRUCT_END
|
---|
63 | #ifdef PACK_STRUCT_USE_INCLUDES
|
---|
64 | # include "arch/epstruct.h"
|
---|
65 | #endif
|
---|
66 |
|
---|
67 | /** MEMCPY-like copying of IP addresses where addresses are known to be
|
---|
68 | * 16-bit-aligned if the port is correctly configured (so a port could define
|
---|
69 | * this to copying 2 u16_t's) - no NULL-pointer-checking needed. */
|
---|
70 | #ifndef IPADDR_WORDALIGNED_COPY_TO_IP4_ADDR_T
|
---|
71 | #define IPADDR_WORDALIGNED_COPY_TO_IP4_ADDR_T(dest, src) SMEMCPY(dest, src, sizeof(ip4_addr_t))
|
---|
72 | #endif
|
---|
73 |
|
---|
74 | /** MEMCPY-like copying of IP addresses where addresses are known to be
|
---|
75 | * 16-bit-aligned if the port is correctly configured (so a port could define
|
---|
76 | * this to copying 2 u16_t's) - no NULL-pointer-checking needed. */
|
---|
77 | #ifndef IPADDR_WORDALIGNED_COPY_FROM_IP4_ADDR_T
|
---|
78 | #define IPADDR_WORDALIGNED_COPY_FROM_IP4_ADDR_T(dest, src) SMEMCPY(dest, src, sizeof(ip4_addr_t))
|
---|
79 | #endif
|
---|
80 |
|
---|
81 | #ifdef PACK_STRUCT_USE_INCLUDES
|
---|
82 | # include "arch/bpstruct.h"
|
---|
83 | #endif
|
---|
84 | PACK_STRUCT_BEGIN
|
---|
85 | /** the ARP message, see RFC 826 ("Packet format") */
|
---|
86 | struct etharp_hdr {
|
---|
87 | PACK_STRUCT_FIELD(u16_t hwtype);
|
---|
88 | PACK_STRUCT_FIELD(u16_t proto);
|
---|
89 | PACK_STRUCT_FLD_8(u8_t hwlen);
|
---|
90 | PACK_STRUCT_FLD_8(u8_t protolen);
|
---|
91 | PACK_STRUCT_FIELD(u16_t opcode);
|
---|
92 | PACK_STRUCT_FLD_S(struct eth_addr shwaddr);
|
---|
93 | PACK_STRUCT_FLD_S(struct ip4_addr_wordaligned sipaddr);
|
---|
94 | PACK_STRUCT_FLD_S(struct eth_addr dhwaddr);
|
---|
95 | PACK_STRUCT_FLD_S(struct ip4_addr_wordaligned dipaddr);
|
---|
96 | } PACK_STRUCT_STRUCT;
|
---|
97 | PACK_STRUCT_END
|
---|
98 | #ifdef PACK_STRUCT_USE_INCLUDES
|
---|
99 | # include "arch/epstruct.h"
|
---|
100 | #endif
|
---|
101 |
|
---|
102 | #define SIZEOF_ETHARP_HDR 28
|
---|
103 |
|
---|
104 | /* ARP message types (opcodes) */
|
---|
105 | enum etharp_opcode {
|
---|
106 | ARP_REQUEST = 1,
|
---|
107 | ARP_REPLY = 2
|
---|
108 | };
|
---|
109 |
|
---|
110 | #ifdef __cplusplus
|
---|
111 | }
|
---|
112 | #endif
|
---|
113 |
|
---|
114 | #endif /* LWIP_HDR_PROT_ETHARP_H */
|
---|