openwrt/package/wificonf/include/proto/ethernet.h

   1 /*******************************************************************************
   2  * $Id$
   3  * Copyright 2005, 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 ETHER_ADDR_LEN
  14 #define _NET_ETHERNET_H_
  15
  16 #ifndef _TYPEDEFS_H_
  17 #include "typedefs.h"
  18 #endif
  19
  20 /* enable structure packing */
  21 #if defined(__GNUC__)
  22 #define PACKED  __attribute__((packed))
  23 #else
  24 #pragma pack(1)
  25 #define PACKED
  26 #endif
  27
  28 /*
  29  * The number of bytes in an ethernet (MAC) address.
  30  */
  31 #define ETHER_ADDR_LEN          6
  32
  33 /*
  34  * The number of bytes in the type field.
  35  */
  36 #define ETHER_TYPE_LEN          2
  37
  38 /*
  39  * The number of bytes in the trailing CRC field.
  40  */
  41 #define ETHER_CRC_LEN           4
  42
  43 /*
  44  * The length of the combined header.
  45  */
  46 #define ETHER_HDR_LEN           (ETHER_ADDR_LEN*2+ETHER_TYPE_LEN)
  47
  48 /*
  49  * The minimum packet length.
  50  */
  51 #define ETHER_MIN_LEN           64
  52
  53 /*
  54  * The minimum packet user data length.
  55  */
  56 #define ETHER_MIN_DATA          46
  57
  58 /*
  59  * The maximum packet length.
  60  */
  61 #define ETHER_MAX_LEN           1518
  62
  63 /*
  64  * The maximum packet user data length.
  65  */
  66 #define ETHER_MAX_DATA          1500
  67
  68 /* ether types */
  69 #define ETHER_TYPE_IP           0x0800          /* IP */
  70 #define ETHER_TYPE_ARP          0x0806          /* ARP */
  71 #define ETHER_TYPE_8021Q        0x8100          /* 802.1Q */
  72 #define ETHER_TYPE_BRCM         0x886c          /* Broadcom Corp. */
  73 #define ETHER_TYPE_802_1X       0x888e          /* 802.1x */
  74 #ifdef BCMWPA2
  75 #define ETHER_TYPE_802_1X_PREAUTH       0x88c7  /* 802.1x preauthentication*/
  76 #endif
  77
  78 /* Broadcom subtype follows ethertype;  First 2 bytes are reserved; Next 2 are subtype; */
  79 #define ETHER_BRCM_SUBTYPE_LEN  4               /* Broadcom 4 byte subtype */
  80 #define ETHER_BRCM_CRAM         0x1             /* Broadcom subtype cram protocol */
  81
  82 /* ether header */
  83 #define ETHER_DEST_OFFSET       0               /* dest address offset */
  84 #define ETHER_SRC_OFFSET        6               /* src address offset */
  85 #define ETHER_TYPE_OFFSET       12              /* ether type offset */
  86
  87 /*
  88  * A macro to validate a length with
  89  */
  90 #define ETHER_IS_VALID_LEN(foo) \
  91         ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
  92
  93
  94 #ifndef __INCif_etherh     /* Quick and ugly hack for VxWorks */
  95 /*
  96  * Structure of a 10Mb/s Ethernet header.
  97  */
  98 struct  ether_header {
  99         uint8   ether_dhost[ETHER_ADDR_LEN];
 100         uint8   ether_shost[ETHER_ADDR_LEN];
 101         uint16  ether_type;
 102 } PACKED;
 103
 104 /*
 105  * Structure of a 48-bit Ethernet address.
 106  */
 107 struct  ether_addr {
 108         uint8 octet[ETHER_ADDR_LEN];
 109 } PACKED;
 110 #endif
 111
 112 /*
 113  * Takes a pointer, sets locally admininistered
 114  * address bit in the 48-bit Ethernet address.
 115  */
 116 #define ETHER_SET_LOCALADDR(ea) ( ((uint8 *)(ea))[0] = \
 117                                 (((uint8 *)(ea))[0] | 2) )
 118
 119 /*
 120  * Takes a pointer, returns true if a 48-bit multicast address
 121  * (including broadcast, since it is all ones)
 122  */
 123 #define ETHER_ISMULTI(ea) (((uint8 *)(ea))[0] & 1)
 124
 125
 126 /* compare two ethernet addresses - assumes the pointers can be referenced as shorts */
 127 #define ether_cmp(a, b) ( \
 128         !(((short*)a)[0] == ((short*)b)[0]) | \
 129         !(((short*)a)[1] == ((short*)b)[1]) | \
 130         !(((short*)a)[2] == ((short*)b)[2]))
 131
 132 /* copy an ethernet address - assumes the pointers can be referenced as shorts */
 133 #define ether_copy(s, d) { \
 134         ((short*)d)[0] = ((short*)s)[0]; \
 135         ((short*)d)[1] = ((short*)s)[1]; \
 136         ((short*)d)[2] = ((short*)s)[2]; }
 137
 138 /*
 139  * Takes a pointer, returns true if a 48-bit broadcast (all ones)
 140  */
 141 #define ETHER_ISBCAST(ea) ((((uint8 *)(ea))[0] &                \
 142                             ((uint8 *)(ea))[1] &                \
 143                             ((uint8 *)(ea))[2] &                \
 144                             ((uint8 *)(ea))[3] &                \
 145                             ((uint8 *)(ea))[4] &                \
 146                             ((uint8 *)(ea))[5]) == 0xff)
 147
 148 static const struct ether_addr ether_bcast = {{255, 255, 255, 255, 255, 255}};
 149
 150 /*
 151  * Takes a pointer, returns true if a 48-bit null address (all zeros)
 152  */
 153 #define ETHER_ISNULLADDR(ea) ((((uint8 *)(ea))[0] |             \
 154                             ((uint8 *)(ea))[1] |                \
 155                             ((uint8 *)(ea))[2] |                \
 156                             ((uint8 *)(ea))[3] |                \
 157                             ((uint8 *)(ea))[4] |                \
 158                             ((uint8 *)(ea))[5]) == 0)
 159
 160 /* Differentiated Services Codepoint - upper 6 bits of tos in iphdr */
 161 #define DSCP_MASK               0xFC            /* upper 6 bits */
 162 #define DSCP_SHIFT              2
 163 #define DSCP_WME_PRI_MASK       0xE0            /* upper 3 bits */
 164 #define DSCP_WME_PRI_SHIFT      5
 165
 166 #undef PACKED
 167 #if !defined(__GNUC__)
 168 #pragma pack()
 169 #endif
 170
 171 #endif /* _NET_ETHERNET_H_ */