110 lines
4 KiB
C
110 lines
4 KiB
C
|
/* $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_ */
|