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 <[email protected]> 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 #include "lwip/ip4_addr.h" 43 44 #ifdef __cplusplus 45 extern "C" { 46 #endif 47 48 #ifndef ETHARP_HWADDR_LEN 49 #define ETHARP_HWADDR_LEN ETH_HWADDR_LEN 50 #endif 51 52 #ifdef PACK_STRUCT_USE_INCLUDES 53 # include "arch/bpstruct.h" 54 #endif 55 PACK_STRUCT_BEGIN 56 /** the ARP message, see RFC 826 ("Packet format") */ 57 struct etharp_hdr { 58 PACK_STRUCT_FIELD(u16_t hwtype); 59 PACK_STRUCT_FIELD(u16_t proto); 60 PACK_STRUCT_FLD_8(u8_t hwlen); 61 PACK_STRUCT_FLD_8(u8_t protolen); 62 PACK_STRUCT_FIELD(u16_t opcode); 63 PACK_STRUCT_FLD_S(struct eth_addr shwaddr); 64 PACK_STRUCT_FLD_S(struct ip4_addr2 sipaddr); 65 PACK_STRUCT_FLD_S(struct eth_addr dhwaddr); 66 PACK_STRUCT_FLD_S(struct ip4_addr2 dipaddr); 67 } PACK_STRUCT_STRUCT; 68 PACK_STRUCT_END 69 #ifdef PACK_STRUCT_USE_INCLUDES 70 # include "arch/epstruct.h" 71 #endif 72 73 #define SIZEOF_ETHARP_HDR 28 74 75 /* ARP hwtype values */ 76 enum etharp_hwtype { 77 HWTYPE_ETHERNET = 1 78 /* others not used */ 79 }; 80 81 /* ARP message types (opcodes) */ 82 enum etharp_opcode { 83 ARP_REQUEST = 1, 84 ARP_REPLY = 2 85 }; 86 87 #ifdef __cplusplus 88 } 89 #endif 90 91 #endif /* LWIP_HDR_PROT_ETHARP_H */ 92