src/include/lwip/prot/etharp.h (LwIP)

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/** * @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 */