[457] | 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 */
|
---|