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1 office 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 */