NetBSD/sys/net/if_ether.h

228 lines
7.9 KiB
C

/* $NetBSD: if_ether.h,v 1.14 2000/03/06 20:54:41 thorpej 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 */
/*
* Ethernet address - 6 octets
* this is only used by the ethers(3) functions.
*/
struct ether_addr {
u_int8_t ether_addr_octet[ETHER_ADDR_LEN];
} __attribute__((__packed__));
/*
* Structure of a 10Mb/s Ethernet header.
*/
struct ether_header {
u_int8_t ether_dhost[ETHER_ADDR_LEN];
u_int8_t ether_shost[ETHER_ADDR_LEN];
u_int16_t ether_type;
} __attribute__((__packed__));
#include <net/ethertypes.h>
#define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
#define ETHERMTU (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
#define ETHERMIN (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
/*
* Ethernet CRC32 polynomials (big- and little-endian verions).
*/
#define ETHER_CRC_POLY_LE 0xedb88320
#define ETHER_CRC_POLY_BE 0x04c11db6
#ifndef _STANDALONE
/*
* Ethernet-specific mbuf flags.
*/
#define M_HASFCS M_LINK0 /* FCS included at end of frame */
#ifdef _KERNEL
/*
* Macro to map an IP multicast address to an Ethernet multicast address.
* The high-order 25 bits of the Ethernet address are statically assigned,
* and the low-order 23 bits are taken from the low end of the IP address.
*/
#define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
/* struct in_addr *ipaddr; */ \
/* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \
{ \
(enaddr)[0] = 0x01; \
(enaddr)[1] = 0x00; \
(enaddr)[2] = 0x5e; \
(enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \
(enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \
(enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \
}
/*
* Macro to map an IP6 multicast address to an Ethernet multicast address.
* The high-order 16 bits of the Ethernet address are statically assigned,
* and the low-order 32 bits are taken from the low end of the IP6 address.
*/
#define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \
/* struct in6_addr *ip6addr; */ \
/* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \
{ \
(enaddr)[0] = 0x33; \
(enaddr)[1] = 0x33; \
(enaddr)[2] = ((u_int8_t *)ip6addr)[12]; \
(enaddr)[3] = ((u_int8_t *)ip6addr)[13]; \
(enaddr)[4] = ((u_int8_t *)ip6addr)[14]; \
(enaddr)[5] = ((u_int8_t *)ip6addr)[15]; \
}
#endif
/*
* Structure shared between the ethernet driver modules and
* the multicast list code. For example, each ec_softc or il_softc
* begins with this structure.
*/
struct ethercom {
struct ifnet ec_if; /* network-visible interface */
LIST_HEAD(, ether_multi) ec_multiaddrs; /* list of ether multicast addrs */
int ec_multicnt; /* length of ac_multiaddrs list */
};
#ifdef _KERNEL
u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN];
u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN];
u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN];
int ether_addmulti __P((struct ifreq *, struct ethercom *));
int ether_delmulti __P((struct ifreq *, struct ethercom *));
#endif /* _KERNEL */
/*
* Ethernet multicast address structure. There is one of these for each
* multicast address or range of multicast addresses that we are supposed
* to listen to on a particular interface. They are kept in a linked list,
* rooted in the interface's ethercom structure.
*/
struct ether_multi {
u_int8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */
u_int8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */
struct ethercom *enm_ec; /* back pointer to ethercom */
u_int enm_refcount; /* no. claims to this addr/range */
LIST_ENTRY(ether_multi) enm_list;
};
/*
* Structure used by macros below to remember position when stepping through
* all of the ether_multi records.
*/
struct ether_multistep {
struct ether_multi *e_enm;
};
/*
* Macro for looking up the ether_multi record for a given range of Ethernet
* multicast addresses connected to a given ethercom structure. If no matching
* record is found, "enm" returns NULL.
*/
#define ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm) \
/* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \
/* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \
/* struct ethercom *ec; */ \
/* struct ether_multi *enm; */ \
{ \
for ((enm) = (ec)->ec_multiaddrs.lh_first; \
(enm) != NULL && \
(bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \
bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \
(enm) = (enm)->enm_list.le_next); \
}
/*
* Macro to step through all of the ether_multi records, one at a time.
* The current position is remembered in "step", which the caller must
* provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step"
* and get the first record. Both macros return a NULL "enm" when there
* are no remaining records.
*/
#define ETHER_NEXT_MULTI(step, enm) \
/* struct ether_multistep step; */ \
/* struct ether_multi *enm; */ \
{ \
if (((enm) = (step).e_enm) != NULL) \
(step).e_enm = (enm)->enm_list.le_next; \
}
#define ETHER_FIRST_MULTI(step, ec, enm) \
/* struct ether_multistep step; */ \
/* struct ethercom *ec; */ \
/* struct ether_multi *enm; */ \
{ \
(step).e_enm = (ec)->ec_multiaddrs.lh_first; \
ETHER_NEXT_MULTI((step), (enm)); \
}
#ifdef _KERNEL
u_int32_t ether_crc32_le __P((const u_int8_t *, size_t));
u_int32_t ether_crc32_be __P((const u_int8_t *, size_t));
#else
/*
* Prototype ethers(3) functions.
*/
#include <sys/cdefs.h>
__BEGIN_DECLS
char * ether_ntoa __P((struct ether_addr *));
struct ether_addr *
ether_aton __P((const char *));
int ether_ntohost __P((char *, struct ether_addr *));
int ether_hostton __P((const char *, struct ether_addr *));
int ether_line __P((const char *, struct ether_addr *, char *));
__END_DECLS
#endif
#endif /* _STANDALONE */
#endif /* _NET_IF_ETHER_H_ */