openwrt/target/linux/package/openwrt/include/proto/ethernet.h

   1 /*******************************************************************************
   2  * $Id$
   3  * Copyright 2004, Broadcom Corporation
   4  * All Rights Reserved.
   5  *
   6  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
   7  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
   8  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
   9  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  10  * From FreeBSD 2.2.7: Fundamental constants relating to ethernet.
  11  ******************************************************************************/
  12
  13 #ifndef _NET_ETHERNET_H_            /* use native BSD ethernet.h when available */
  14 #define _NET_ETHERNET_H_
  15
  16 #ifndef _TYPEDEFS_H_
  17 #include "typedefs.h"
  18 #endif
  19
  20 #if defined(__GNUC__)
  21 #define PACKED  __attribute__((packed))
  22 #else
  23 #define PACKED
  24 #endif
  25
  26 /*
  27  * The number of bytes in an ethernet (MAC) address.
  28  */
  29 #ifndef ETHER_ADDR_LEN
  30 #define ETHER_ADDR_LEN          6
  31 #endif
  32
  33 /*
  34  * The number of bytes in the type field.
  35  */
  36 #ifndef ETHER_TYPE_LEN
  37 #define ETHER_TYPE_LEN          2
  38 #endif
  39
  40 /*
  41  * The number of bytes in the trailing CRC field.
  42  */
  43 #ifndef ETHER_CRC_LEN
  44 #define ETHER_CRC_LEN           4
  45 #endif
  46
  47 /*
  48  * The length of the combined header.
  49  */
  50 #ifndef ETHER_HDR_LEN
  51 #define ETHER_HDR_LEN           (ETHER_ADDR_LEN*2+ETHER_TYPE_LEN)
  52 #endif
  53
  54 /*
  55  * The minimum packet length.
  56  */
  57 #ifndef ETHER_MIN_LEN
  58 #define ETHER_MIN_LEN           64
  59 #endif
  60
  61 /*
  62  * The minimum packet user data length.
  63  */
  64 #ifndef ETHER_MIN_DATA
  65 #define ETHER_MIN_DATA          46
  66 #endif
  67
  68 /*
  69  * The maximum packet length.
  70  */
  71 #ifndef ETHER_MAX_LEN
  72 #define ETHER_MAX_LEN           1518
  73 #endif
  74
  75 /*
  76  * The maximum packet user data length.
  77  */
  78 #define ETHER_MAX_DATA          1500
  79
  80 /*
  81  * Used to uniquely identify a 802.1q VLAN-tagged header.
  82  */
  83 #define VLAN_TAG                        0x8100
  84
  85 /*
  86  * Located after dest & src address in ether header.
  87  */
  88 #define VLAN_FIELDS_OFFSET              (ETHER_ADDR_LEN * 2)
  89
  90 /*
  91  * 4 bytes of vlan field info.
  92  */
  93 #define VLAN_FIELDS_SIZE                4
  94
  95 /* location of bits in 16-bit vlan fields */
  96 #define VLAN_PRI_SHIFT          13      /* user priority */
  97 #define VLAN_CFI_SHIFT          12      /* canonical format indicator bit */
  98
  99 /* 3 bits of priority */
 100 #define VLAN_PRI_MASK                   7
 101 /* 12 bits of vlan identfier (VID) */
 102 #define VLAN_VID_MASK           0xFFF   /* VLAN identifier (VID) field */
 103
 104 struct  vlan_tags {
 105         uint16  tag_type;       /* 0x8100 for VLAN */
 106         uint16  tag_control;    /* prio | cfi | vid */
 107 } PACKED ;
 108
 109 /* 802.1X ethertype */
 110
 111 #define ETHER_TYPE_IP           0x0800          /* IP */
 112 #define ETHER_TYPE_BRCM         0x886c          /* Broadcom Corp. */
 113 #define ETHER_TYPE_802_1X       0x888e          /* 802.1x */
 114
 115 #define ETHER_BRCM_SUBTYPE_LEN  4               /* Broadcom 4byte subtype follows ethertype */
 116 #define ETHER_BRCM_CRAM         0x1             /* Broadcom subtype cram protocol */
 117
 118 /*
 119  * A macro to validate a length with
 120  */
 121 #define ETHER_IS_VALID_LEN(foo) \
 122         ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
 123
 124 #ifndef __NET_ETHERNET_H
 125 #ifndef __INCif_etherh     /* Quick and ugly hack for VxWorks */
 126 /*
 127  * Structure of a 10Mb/s Ethernet header.
 128  */
 129 struct  ether_header {
 130         uint8   ether_dhost[ETHER_ADDR_LEN];
 131         uint8   ether_shost[ETHER_ADDR_LEN];
 132         uint16  ether_type;
 133 } PACKED ;
 134
 135 /*
 136  * Structure of a 48-bit Ethernet address.
 137  */
 138 struct  ether_addr {
 139         uint8 octet[ETHER_ADDR_LEN];
 140 } PACKED ;
 141 #endif
 142 #endif
 143
 144 /*
 145  * Takes a pointer, returns true if a 48-bit multicast address
 146  * (including broadcast, since it is all ones)
 147  */
 148 #define ETHER_ISMULTI(ea) (((uint8 *)(ea))[0] & 1)
 149
 150 /*
 151  * Takes a pointer, returns true if a 48-bit broadcast (all ones)
 152  */
 153 #define ETHER_ISBCAST(ea) ((((uint8 *)(ea))[0] &                \
 154                             ((uint8 *)(ea))[1] &                \
 155                             ((uint8 *)(ea))[2] &                \
 156                             ((uint8 *)(ea))[3] &                \
 157                             ((uint8 *)(ea))[4] &                \
 158                             ((uint8 *)(ea))[5]) == 0xff)
 159
 160 static const struct ether_addr ether_bcast = {{255, 255, 255, 255, 255, 255}};
 161
 162 /*
 163  * Takes a pointer, returns true if a 48-bit null address (all zeros)
 164  */
 165 #define ETHER_ISNULLADDR(ea) ((((uint8 *)(ea))[0] |             \
 166                             ((uint8 *)(ea))[1] |                \
 167                             ((uint8 *)(ea))[2] |                \
 168                             ((uint8 *)(ea))[3] |                \
 169                             ((uint8 *)(ea))[4] |                \
 170                             ((uint8 *)(ea))[5]) == 0)
 171
 172 /* Differentiated Services Codepoint - lower 6 bits of tos in iphdr */
 173 #define DSCP_PRI_MASK           0x3F            /* bits 0-6 */
 174 #define DSCP_WME_PRI_MASK       0x38            /* bits 3-6 */
 175 #define DSCP_WME_PRI_SHIFT      3
 176
 177 #undef PACKED
 178
 179 #endif /* _NET_ETHERNET_H_ */