1 | /**
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2 | * @file
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3 | * Ethernet protocol definitions
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4 | */
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5 |
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6 | /*
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7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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8 | * All rights reserved.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without modification,
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11 | * are permitted provided that the following conditions are met:
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12 | *
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13 | * 1. Redistributions of source code must retain the above copyright notice,
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14 | * this list of conditions and the following disclaimer.
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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16 | * this list of conditions and the following disclaimer in the documentation
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17 | * and/or other materials provided with the distribution.
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18 | * 3. The name of the author may not be used to endorse or promote products
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19 | * derived from this software without specific prior written permission.
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20 | *
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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30 | * OF SUCH DAMAGE.
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31 | *
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32 | * This file is part of the lwIP TCP/IP stack.
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33 | *
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34 | * Author: Adam Dunkels <adam@sics.se>
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35 | *
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36 | */
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37 | #ifndef LWIP_HDR_PROT_ETHERNET_H
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38 | #define LWIP_HDR_PROT_ETHERNET_H
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39 |
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40 | #include "lwip/arch.h"
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41 | #include "lwip/prot/ieee.h"
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42 |
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43 | #ifdef __cplusplus
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44 | extern "C" {
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45 | #endif
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46 |
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47 | #ifndef ETH_HWADDR_LEN
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48 | #ifdef ETHARP_HWADDR_LEN
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49 | #define ETH_HWADDR_LEN ETHARP_HWADDR_LEN /* compatibility mode */
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50 | #else
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51 | #define ETH_HWADDR_LEN 6
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52 | #endif
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53 | #endif
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54 |
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55 | #ifdef PACK_STRUCT_USE_INCLUDES
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56 | # include "arch/bpstruct.h"
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57 | #endif
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58 | PACK_STRUCT_BEGIN
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59 | /** An Ethernet MAC address */
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60 | struct eth_addr {
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61 | PACK_STRUCT_FLD_8(u8_t addr[ETH_HWADDR_LEN]);
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62 | } PACK_STRUCT_STRUCT;
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63 | PACK_STRUCT_END
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64 | #ifdef PACK_STRUCT_USE_INCLUDES
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65 | # include "arch/epstruct.h"
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66 | #endif
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67 |
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68 | /** Initialize a struct eth_addr with its 6 bytes (takes care of correct braces) */
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69 | #define ETH_ADDR(b0, b1, b2, b3, b4, b5) {{b0, b1, b2, b3, b4, b5}}
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70 |
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71 | #ifdef PACK_STRUCT_USE_INCLUDES
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72 | # include "arch/bpstruct.h"
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73 | #endif
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74 | PACK_STRUCT_BEGIN
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75 | /** Ethernet header */
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76 | struct eth_hdr {
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77 | #if ETH_PAD_SIZE
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78 | PACK_STRUCT_FLD_8(u8_t padding[ETH_PAD_SIZE]);
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79 | #endif
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80 | PACK_STRUCT_FLD_S(struct eth_addr dest);
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81 | PACK_STRUCT_FLD_S(struct eth_addr src);
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82 | PACK_STRUCT_FIELD(u16_t type);
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83 | } PACK_STRUCT_STRUCT;
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84 | PACK_STRUCT_END
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85 | #ifdef PACK_STRUCT_USE_INCLUDES
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86 | # include "arch/epstruct.h"
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87 | #endif
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88 |
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89 | #define SIZEOF_ETH_HDR (14 + ETH_PAD_SIZE)
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90 |
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91 | #ifdef PACK_STRUCT_USE_INCLUDES
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92 | # include "arch/bpstruct.h"
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93 | #endif
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94 | PACK_STRUCT_BEGIN
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95 | /** VLAN header inserted between ethernet header and payload
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96 | * if 'type' in ethernet header is ETHTYPE_VLAN.
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97 | * See IEEE802.Q */
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98 | struct eth_vlan_hdr {
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99 | PACK_STRUCT_FIELD(u16_t prio_vid);
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100 | PACK_STRUCT_FIELD(u16_t tpid);
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101 | } PACK_STRUCT_STRUCT;
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102 | PACK_STRUCT_END
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103 | #ifdef PACK_STRUCT_USE_INCLUDES
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104 | # include "arch/epstruct.h"
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105 | #endif
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106 |
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107 | #define SIZEOF_VLAN_HDR 4
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108 | #define VLAN_ID(vlan_hdr) (lwip_htons((vlan_hdr)->prio_vid) & 0xFFF)
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109 |
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110 | /** The 24-bit IANA IPv4-multicast OUI is 01-00-5e: */
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111 | #define LL_IP4_MULTICAST_ADDR_0 0x01
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112 | #define LL_IP4_MULTICAST_ADDR_1 0x00
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113 | #define LL_IP4_MULTICAST_ADDR_2 0x5e
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114 |
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115 | /** IPv6 multicast uses this prefix */
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116 | #define LL_IP6_MULTICAST_ADDR_0 0x33
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117 | #define LL_IP6_MULTICAST_ADDR_1 0x33
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118 |
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119 | #define eth_addr_cmp(addr1, addr2) (memcmp((addr1)->addr, (addr2)->addr, ETH_HWADDR_LEN) == 0)
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120 |
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121 | #ifdef __cplusplus
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122 | }
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123 | #endif
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124 |
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125 | #endif /* LWIP_HDR_PROT_ETHERNET_H */
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