1 /** 2 * @file 3 * Ethernet 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_ETHERNET_H 38 #define LWIP_HDR_PROT_ETHERNET_H 39 40 #include "lwip/arch.h" 41 #include "lwip/prot/ieee.h" 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 #ifndef ETH_HWADDR_LEN 48 #ifdef ETHARP_HWADDR_LEN 49 #define ETH_HWADDR_LEN ETHARP_HWADDR_LEN /* compatibility mode */ 50 #else 51 #define ETH_HWADDR_LEN 6 52 #endif 53 #endif 54 55 #ifdef PACK_STRUCT_USE_INCLUDES 56 # include "arch/bpstruct.h" 57 #endif 58 PACK_STRUCT_BEGIN 59 /** An Ethernet MAC address */ 60 struct eth_addr { 61 PACK_STRUCT_FLD_8(u8_t addr[ETH_HWADDR_LEN]); 62 } PACK_STRUCT_STRUCT; 63 PACK_STRUCT_END 64 #ifdef PACK_STRUCT_USE_INCLUDES 65 # include "arch/epstruct.h" 66 #endif 67 68 /** Initialize a struct eth_addr with its 6 bytes (takes care of correct braces) */ 69 #define ETH_ADDR(b0, b1, b2, b3, b4, b5) {{b0, b1, b2, b3, b4, b5}} 70 71 #ifdef PACK_STRUCT_USE_INCLUDES 72 # include "arch/bpstruct.h" 73 #endif 74 PACK_STRUCT_BEGIN 75 /** Ethernet header */ 76 struct eth_hdr { 77 #if ETH_PAD_SIZE 78 PACK_STRUCT_FLD_8(u8_t padding[ETH_PAD_SIZE]); 79 #endif 80 PACK_STRUCT_FLD_S(struct eth_addr dest); 81 PACK_STRUCT_FLD_S(struct eth_addr src); 82 PACK_STRUCT_FIELD(u16_t type); 83 } PACK_STRUCT_STRUCT; 84 PACK_STRUCT_END 85 #ifdef PACK_STRUCT_USE_INCLUDES 86 # include "arch/epstruct.h" 87 #endif 88 89 #define SIZEOF_ETH_HDR (14 + ETH_PAD_SIZE) 90 91 #ifdef PACK_STRUCT_USE_INCLUDES 92 # include "arch/bpstruct.h" 93 #endif 94 PACK_STRUCT_BEGIN 95 /** VLAN header inserted between ethernet header and payload 96 * if 'type' in ethernet header is ETHTYPE_VLAN. 97 * See IEEE802.Q */ 98 struct eth_vlan_hdr { 99 PACK_STRUCT_FIELD(u16_t prio_vid); 100 PACK_STRUCT_FIELD(u16_t tpid); 101 } PACK_STRUCT_STRUCT; 102 PACK_STRUCT_END 103 #ifdef PACK_STRUCT_USE_INCLUDES 104 # include "arch/epstruct.h" 105 #endif 106 107 #define SIZEOF_VLAN_HDR 4 108 #define VLAN_ID(vlan_hdr) (lwip_htons((vlan_hdr)->prio_vid) & 0xFFF) 109 110 /** The 24-bit IANA IPv4-multicast OUI is 01-00-5e: */ 111 #define LL_IP4_MULTICAST_ADDR_0 0x01 112 #define LL_IP4_MULTICAST_ADDR_1 0x00 113 #define LL_IP4_MULTICAST_ADDR_2 0x5e 114 115 /** IPv6 multicast uses this prefix */ 116 #define LL_IP6_MULTICAST_ADDR_0 0x33 117 #define LL_IP6_MULTICAST_ADDR_1 0x33 118 119 #define eth_addr_cmp(addr1, addr2) (memcmp((addr1)->addr, (addr2)->addr, ETH_HWADDR_LEN) == 0) 120 121 #ifdef __cplusplus 122 } 123 #endif 124 125 #endif /* LWIP_HDR_PROT_ETHERNET_H */ 126