minix/sys/net/if_ether.h

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2011-02-21 14:13:55 +01:00
/* $NetBSD: if_ether.h,v 1.58 2010/05/19 20:41:59 christos Exp $ */
/*
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)if_ether.h 8.1 (Berkeley) 6/10/93
*/
#ifndef _NET_IF_ETHER_H_
#define _NET_IF_ETHER_H_
/*
* Some basic Ethernet constants.
*/
#define ETHER_ADDR_LEN 6 /* length of an Ethernet address */
#define ETHER_TYPE_LEN 2 /* length of the Ethernet type field */
#define ETHER_CRC_LEN 4 /* length of the Ethernet CRC */
#define ETHER_HDR_LEN ((ETHER_ADDR_LEN * 2) + ETHER_TYPE_LEN)
#define ETHER_MIN_LEN 64 /* minimum frame length, including CRC */
#define ETHER_MAX_LEN 1518 /* maximum frame length, including CRC */
#define ETHER_MAX_LEN_JUMBO 9018 /* maximum jumbo frame len, including CRC */
/*
* Some Ethernet extensions.
*/
#define ETHER_VLAN_ENCAP_LEN 4 /* length of 802.1Q VLAN encapsulation */
#define ETHER_PPPOE_ENCAP_LEN 8 /* length of PPPoE encapsulation */
/*
* Ethernet address - 6 octets
* this is only used by the ethers(3) functions.
*/
struct ether_addr {
uint8_t ether_addr_octet[ETHER_ADDR_LEN];
} __packed;
/*
* Structure of a 10Mb/s Ethernet header.
*/
struct ether_header {
uint8_t ether_dhost[ETHER_ADDR_LEN];
uint8_t ether_shost[ETHER_ADDR_LEN];
uint16_t ether_type;
} __packed;
#include <net/ethertypes.h>
#define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
#define ETHER_IS_LOCAL(addr) (*(addr) & 0x02) /* is address local? */
#define ETHERMTU_JUMBO (ETHER_MAX_LEN_JUMBO - ETHER_HDR_LEN - ETHER_CRC_LEN)
#define ETHERMTU (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
#define ETHERMIN (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
/*
* Compute the maximum frame size based on ethertype (i.e. possible
* encapsulation) and whether or not an FCS is present.
*/
#define ETHER_MAX_FRAME(ifp, etype, hasfcs) \
((ifp)->if_mtu + ETHER_HDR_LEN + \
((hasfcs) ? ETHER_CRC_LEN : 0) + \
(((etype) == ETHERTYPE_VLAN) ? ETHER_VLAN_ENCAP_LEN : 0) + \
(((etype) == ETHERTYPE_PPPOE) ? ETHER_PPPOE_ENCAP_LEN : 0))
/*
* Ethernet CRC32 polynomials (big- and little-endian verions).
*/
#define ETHER_CRC_POLY_LE 0xedb88320
#define ETHER_CRC_POLY_BE 0x04c11db6
/*
* Prototype ethers(3) functions.
*/
#include <sys/cdefs.h>
__BEGIN_DECLS
char * ether_ntoa(const struct ether_addr *);
struct ether_addr *
ether_aton(const char *);
int ether_ntohost(char *, const struct ether_addr *);
int ether_hostton(const char *, struct ether_addr *);
int ether_line(const char *, struct ether_addr *, char *);
__END_DECLS
#endif /* !_NET_IF_ETHER_H_ */