| /** |
| * @file |
| * ARP protocol definitions |
| */ |
| |
| /* |
| * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| * OF SUCH DAMAGE. |
| * |
| * This file is part of the lwIP TCP/IP stack. |
| * |
| * Author: Adam Dunkels <adam@sics.se> |
| * |
| */ |
| #ifndef LWIP_HDR_PROT_ETHARP_H |
| #define LWIP_HDR_PROT_ETHARP_H |
| |
| #include "lwip/arch.h" |
| #include "lwip/prot/ethernet.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #ifndef ETHARP_HWADDR_LEN |
| #define ETHARP_HWADDR_LEN ETH_HWADDR_LEN |
| #endif |
| |
| /** |
| * struct ip4_addr_wordaligned is used in the definition of the ARP packet format in |
| * order to support compilers that don't have structure packing. |
| */ |
| #ifdef PACK_STRUCT_USE_INCLUDES |
| # include "arch/bpstruct.h" |
| #endif |
| PACK_STRUCT_BEGIN |
| struct ip4_addr_wordaligned { |
| PACK_STRUCT_FIELD(u16_t addrw[2]); |
| } PACK_STRUCT_STRUCT; |
| PACK_STRUCT_END |
| #ifdef PACK_STRUCT_USE_INCLUDES |
| # include "arch/epstruct.h" |
| #endif |
| |
| /** MEMCPY-like copying of IP addresses where addresses are known to be |
| * 16-bit-aligned if the port is correctly configured (so a port could define |
| * this to copying 2 u16_t's) - no NULL-pointer-checking needed. */ |
| #ifndef IPADDR_WORDALIGNED_COPY_TO_IP4_ADDR_T |
| #define IPADDR_WORDALIGNED_COPY_TO_IP4_ADDR_T(dest, src) SMEMCPY(dest, src, sizeof(ip4_addr_t)) |
| #endif |
| |
| /** MEMCPY-like copying of IP addresses where addresses are known to be |
| * 16-bit-aligned if the port is correctly configured (so a port could define |
| * this to copying 2 u16_t's) - no NULL-pointer-checking needed. */ |
| #ifndef IPADDR_WORDALIGNED_COPY_FROM_IP4_ADDR_T |
| #define IPADDR_WORDALIGNED_COPY_FROM_IP4_ADDR_T(dest, src) SMEMCPY(dest, src, sizeof(ip4_addr_t)) |
| #endif |
| |
| #ifdef PACK_STRUCT_USE_INCLUDES |
| # include "arch/bpstruct.h" |
| #endif |
| PACK_STRUCT_BEGIN |
| /** the ARP message, see RFC 826 ("Packet format") */ |
| struct etharp_hdr { |
| PACK_STRUCT_FIELD(u16_t hwtype); |
| PACK_STRUCT_FIELD(u16_t proto); |
| PACK_STRUCT_FLD_8(u8_t hwlen); |
| PACK_STRUCT_FLD_8(u8_t protolen); |
| PACK_STRUCT_FIELD(u16_t opcode); |
| PACK_STRUCT_FLD_S(struct eth_addr shwaddr); |
| PACK_STRUCT_FLD_S(struct ip4_addr_wordaligned sipaddr); |
| PACK_STRUCT_FLD_S(struct eth_addr dhwaddr); |
| PACK_STRUCT_FLD_S(struct ip4_addr_wordaligned dipaddr); |
| } PACK_STRUCT_STRUCT; |
| PACK_STRUCT_END |
| #ifdef PACK_STRUCT_USE_INCLUDES |
| # include "arch/epstruct.h" |
| #endif |
| |
| #define SIZEOF_ETHARP_HDR 28 |
| |
| /* ARP message types (opcodes) */ |
| enum etharp_opcode { |
| ARP_REQUEST = 1, |
| ARP_REPLY = 2 |
| }; |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* LWIP_HDR_PROT_ETHARP_H */ |