bsd/net/ethernet.h

   1 /*
   2  * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Fundamental constants relating to ethernet.
  30  *
  31  */
  32
  33 #ifndef _NET_ETHERNET_H_
  34 #define _NET_ETHERNET_H_
  35 #include <sys/appleapiopts.h>
  36 #include <sys/types.h>          /* u_ types */
  37
  38 /*
  39  * The number of bytes in an ethernet (MAC) address.
  40  */
  41 #define ETHER_ADDR_LEN          6
  42
  43 /*
  44  * The number of bytes in the type field.
  45  */
  46 #define ETHER_TYPE_LEN          2
  47
  48 /*
  49  * The number of bytes in the trailing CRC field.
  50  */
  51 #define ETHER_CRC_LEN           4
  52
  53 /*
  54  * The length of the combined header.
  55  */
  56 #define ETHER_HDR_LEN           (ETHER_ADDR_LEN*2+ETHER_TYPE_LEN)
  57
  58 /*
  59  * The minimum packet length.
  60  */
  61 #define ETHER_MIN_LEN           64
  62
  63 /*
  64  * The maximum packet length.
  65  */
  66 #define ETHER_MAX_LEN           1518
  67
  68 /*
  69  * Mbuf adjust factor to force 32-bit alignment of IP header.
  70  * Drivers should do m_adj(m, ETHER_ALIGN) when setting up a
  71  * receive so the upper layers get the IP header properly aligned
  72  * past the 14-byte Ethernet header.
  73  */
  74 #define ETHER_ALIGN             2       /* driver adjust for IP hdr alignment */
  75
  76 /*
  77  * A macro to validate a length with
  78  */
  79 #define ETHER_IS_VALID_LEN(foo) \
  80         ((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
  81
  82 /*
  83  * Structure of a 10Mb/s Ethernet header.
  84  */
  85 struct  ether_header {
  86         u_char  ether_dhost[ETHER_ADDR_LEN];
  87         u_char  ether_shost[ETHER_ADDR_LEN];
  88         u_short ether_type;
  89 };
  90
  91 /*
  92  * Structure of a 48-bit Ethernet address.
  93  */
  94 struct  ether_addr {
  95         u_char octet[ETHER_ADDR_LEN];
  96 };
  97
  98 #define ether_addr_octet octet
  99
 100 #define ETHERTYPE_PUP           0x0200  /* PUP protocol */
 101 #define ETHERTYPE_IP            0x0800  /* IP protocol */
 102 #define ETHERTYPE_ARP           0x0806  /* Addr. resolution protocol */
 103 #define ETHERTYPE_REVARP        0x8035  /* reverse Addr. resolution protocol */
 104 #define ETHERTYPE_VLAN          0x8100  /* IEEE 802.1Q VLAN tagging */
 105 #define ETHERTYPE_IPV6          0x86dd  /* IPv6 */
 106 #define ETHERTYPE_PAE           0x888e  /* EAPOL PAE/802.1x */
 107 #define ETHERTYPE_RSN_PREAUTH   0x88c7  /* 802.11i / RSN Pre-Authentication */
 108 #define ETHERTYPE_LOOPBACK      0x9000  /* used to test interfaces */
 109 /* XXX - add more useful types here */
 110
 111 /*
 112  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
 113  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
 114  * by an ETHER type (as given above) and then the (variable-length) header.
 115  */
 116 #define ETHERTYPE_TRAIL         0x1000          /* Trailer packet */
 117 #define ETHERTYPE_NTRAILER      16
 118
 119 #define ETHERMTU        (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
 120 #define ETHERMIN        (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
 121
 122 #ifdef KERNEL_PRIVATE
 123 /*
 124  * The following are used by ethernet interfaces.
 125  */
 126
 127 struct  ether_addr *ether_aton(const char *);
 128
 129 #ifdef BSD_KERNEL_PRIVATE
 130 extern u_char   etherbroadcastaddr[ETHER_ADDR_LEN];
 131
 132
 133 static __inline__ int
 134 _ether_cmp(const void * a, const void * b)
 135 {
 136         const u_int16_t * a_s = (const u_int16_t *)a;
 137         const u_int16_t * b_s = (const u_int16_t *)b;
 138
 139         if (a_s[0] != b_s[0]
 140                 || a_s[1] != b_s[1]
 141                 || a_s[2] != b_s[2]) {
 142                 return (1);
 143         }
 144         return (0);
 145 }
 146
 147 #endif /* BSD_KERNEL_PRIVATE */
 148
 149 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
 150
 151 #endif /* KERNEL_PRIVATE */
 152
 153 #ifndef KERNEL
 154 #include <sys/cdefs.h>
 155
 156 /*
 157  * Ethernet address conversion/parsing routines.
 158  */
 159 __BEGIN_DECLS
 160
 161 int     ether_hostton(const char *, struct ether_addr *);
 162 int     ether_line(const char *, struct ether_addr *, char *);
 163 char    *ether_ntoa(const struct ether_addr *);
 164 struct  ether_addr *ether_aton(const char *);
 165 int     ether_ntohost(char *, const struct ether_addr *);
 166 __END_DECLS
 167 #endif /* !KERNEL */
 168
 169 #endif /* !_NET_ETHERNET_H_ */