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      1 /* Copyright (C) 1997, 1999, 2001, 2008 Free Software Foundation, Inc.
      2    This file is part of the GNU C Library.
      3 
      4    The GNU C Library is free software; you can redistribute it and/or
      5    modify it under the terms of the GNU Lesser General Public
      6    License as published by the Free Software Foundation; either
      7    version 2.1 of the License, or (at your option) any later version.
      8 
      9    The GNU C Library is distributed in the hope that it will be useful,
     10    but WITHOUT ANY WARRANTY; without even the implied warranty of
     11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12    Lesser General Public License for more details.
     13 
     14    You should have received a copy of the GNU Lesser General Public
     15    License along with the GNU C Library; if not, write to the Free
     16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     17    02111-1307 USA.  */
     18 
     19 /* Based on the FreeBSD version of this file. Curiously, that file
     20    lacks a copyright in the header. */
     21 
     22 #ifndef __NET_ETHERNET_H
     23 #define __NET_ETHERNET_H 1
     24 
     25 #include <sys/cdefs.h>
     26 #include <sys/types.h>
     27 #include <linux/if_ether.h>     /* IEEE 802.3 Ethernet constants */
     28 
     29 __BEGIN_DECLS
     30 
     31 /* This is a name for the 48 bit ethernet address available on many
     32    systems.  */
     33 struct ether_addr
     34 {
     35   u_int8_t ether_addr_octet[ETH_ALEN];
     36 } __attribute__ ((__packed__));
     37 
     38 /* 10Mb/s ethernet header */
     39 struct ether_header
     40 {
     41   u_int8_t  ether_dhost[ETH_ALEN];	/* destination eth addr	*/
     42   u_int8_t  ether_shost[ETH_ALEN];	/* source ether addr	*/
     43   u_int16_t ether_type;		        /* packet type ID field	*/
     44 } __attribute__ ((__packed__));
     45 
     46 /* Ethernet protocol ID's */
     47 #define	ETHERTYPE_PUP		0x0200          /* Xerox PUP */
     48 #define ETHERTYPE_SPRITE	0x0500		/* Sprite */
     49 #define	ETHERTYPE_IP		0x0800		/* IP */
     50 #define	ETHERTYPE_ARP		0x0806		/* Address resolution */
     51 #define	ETHERTYPE_REVARP	0x8035		/* Reverse ARP */
     52 #define ETHERTYPE_AT		0x809B		/* AppleTalk protocol */
     53 #define ETHERTYPE_AARP		0x80F3		/* AppleTalk ARP */
     54 #define	ETHERTYPE_VLAN		0x8100		/* IEEE 802.1Q VLAN tagging */
     55 #define ETHERTYPE_IPX		0x8137		/* IPX */
     56 #define	ETHERTYPE_IPV6		0x86dd		/* IP protocol version 6 */
     57 #define ETHERTYPE_LOOPBACK	0x9000		/* used to test interfaces */
     58 
     59 
     60 #define	ETHER_ADDR_LEN	ETH_ALEN                 /* size of ethernet addr */
     61 #define	ETHER_TYPE_LEN	2                        /* bytes in type field */
     62 #define	ETHER_CRC_LEN	4                        /* bytes in CRC field */
     63 #define	ETHER_HDR_LEN	ETH_HLEN                 /* total octets in header */
     64 #define	ETHER_MIN_LEN	(ETH_ZLEN + ETHER_CRC_LEN) /* min packet length */
     65 #define	ETHER_MAX_LEN	(ETH_FRAME_LEN + ETHER_CRC_LEN) /* max packet length */
     66 
     67 /* make sure ethenet length is valid */
     68 #define	ETHER_IS_VALID_LEN(foo)	\
     69 	((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
     70 
     71 /*
     72  * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
     73  * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
     74  * by an ETHER type (as given above) and then the (variable-length) header.
     75  */
     76 #define	ETHERTYPE_TRAIL		0x1000		/* Trailer packet */
     77 #define	ETHERTYPE_NTRAILER	16
     78 
     79 #define	ETHERMTU	ETH_DATA_LEN
     80 #define	ETHERMIN	(ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
     81 
     82 __END_DECLS
     83 
     84 #endif	/* net/ethernet.h */
     85