/* $OpenBSD: if_ether.h,v 1.39 2007/05/16 09:24:07 dlg Exp $ */
/* $NetBSD: if_ether.h,v 1.22 1996/05/11 13:00:00 mycroft 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 _NETINET_IF_ETHER_H_
#define _NETINET_IF_ETHER_H_
/*
* Some basic Ethernet constants.
*/
#define ETHER_ADDR_LEN 6 /* Ethernet address length */
#define ETHER_TYPE_LEN 2 /* Ethernet type field length */
#define ETHER_CRC_LEN 4 /* Ethernet CRC length */
#define ETHER_HDR_LEN ((ETHER_ADDR_LEN * 2) + ETHER_TYPE_LEN)
#define ETHER_MIN_LEN 64 /* Minimum frame length, CRC included */
#define ETHER_MAX_LEN 1518 /* Maximum frame length, CRC included */
#define ETHER_MAX_DIX_LEN 1536 /* Maximum DIX frame length */
/*
* Some Ethernet extensions.
*/
#define ETHER_VLAN_ENCAP_LEN 4 /* len of 802.1Q VLAN encapsulation */
/*
* Mbuf adjust factor to force 32-bit alignment of IP header.
* Drivers should do m_adj(m, ETHER_ALIGN) when setting up a
* receive so the upper layers get the IP header properly aligned
* past the 14-byte Ethernet header.
*/
#define ETHER_ALIGN 2 /* driver adjust for IP hdr alignment */
/*
* Ethernet address - 6 octets
*/
struct ether_addr {
u_int8_t ether_addr_octet[ETHER_ADDR_LEN];
};
/*
* The length of the combined 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;
};
#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
/*
* 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 IPv6 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 IPv6 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
/*
* Ethernet Address Resolution Protocol.
*
* See RFC 826 for protocol description. Structure below is adapted
* to resolving internet addresses. Field names used correspond to
* RFC 826.
*/
struct ether_arp {
struct arphdr ea_hdr; /* fixed-size header */
u_int8_t arp_sha[ETHER_ADDR_LEN]; /* sender hardware address */
u_int8_t arp_spa[4]; /* sender protocol address */
u_int8_t arp_tha[ETHER_ADDR_LEN]; /* target hardware address */
u_int8_t arp_tpa[4]; /* target protocol address */
};
#define arp_hrd ea_hdr.ar_hrd
#define arp_pro ea_hdr.ar_pro
#define arp_hln ea_hdr.ar_hln
#define arp_pln ea_hdr.ar_pln
#define arp_op ea_hdr.ar_op
/*
* Structure shared between the ethernet driver modules and
* the address resolution code. For example, each ec_softc or il_softc
* begins with this structure.
*/
struct arpcom {
struct ifnet ac_if; /* network-visible interface */
u_int8_t ac_enaddr[ETHER_ADDR_LEN]; /* ethernet hardware address */
char ac__pad[2]; /* pad for some machines */
LIST_HEAD(, ether_multi) ac_multiaddrs; /* list of multicast addrs */
int ac_multicnt; /* length of ac_multiaddrs */
int ac_multirangecnt; /* number of mcast ranges */
};
struct llinfo_arp {
LIST_ENTRY(llinfo_arp) la_list;
struct rtentry *la_rt;
struct mbuf *la_hold; /* last packet until resolved/timeout */
long la_asked; /* last time we QUERIED for this addr */
#define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */
};
struct sockaddr_inarp {
u_int8_t sin_len;
u_int8_t sin_family;
u_int16_t sin_port;
struct in_addr sin_addr;
struct in_addr sin_srcaddr;
u_int16_t sin_tos;
u_int16_t sin_other;
#define SIN_PROXY 1
};
/*
* IP and ethernet specific routing flags
*/
#define RTF_USETRAILERS RTF_PROTO1 /* use trailers */
#define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */
#define RTF_PERMANENT_ARP RTF_PROTO3 /* only manual overwrite of entry */
#ifdef _KERNEL
extern u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN];
extern u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN];
extern u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN];
extern struct ifqueue arpintrq;
void arpwhohas(struct arpcom *, struct in_addr *);
void arpintr(void);
int arpresolve(struct arpcom *,
struct rtentry *, struct mbuf *, struct sockaddr *, u_char *);
void arp_ifinit(struct arpcom *, struct ifaddr *);
void arp_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
int ether_addmulti(struct ifreq *, struct arpcom *);
int ether_delmulti(struct ifreq *, struct arpcom *);
int ether_multiaddr(struct sockaddr *, u_int8_t[], u_int8_t[]);
#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 arpcom structure. (This really has nothing to
* do with ARP, or with the Internet address family, but this appears to be
* the minimally-disrupting place to put it.)
*/
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 arpcom *enm_ac; /* back pointer to arpcom */
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 arpcom structure. If no matching
* record is found, "enm" returns NULL.
*/
#define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \
/* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \
/* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \
/* struct arpcom *ac; */ \
/* struct ether_multi *enm; */ \
{ \
for ((enm) = LIST_FIRST(&(ac)->ac_multiaddrs); \
(enm) != LIST_END(&(ac)->ac_multiaddrs) && \
(bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \
bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \
(enm) = LIST_NEXT((enm), enm_list)); \
}
/*
* 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 = LIST_NEXT((enm), enm_list); \
}
#define ETHER_FIRST_MULTI(step, ac, enm) \
/* struct ether_multistep step; */ \
/* struct arpcom *ac; */ \
/* struct ether_multi *enm; */ \
{ \
(step).e_enm = LIST_FIRST(&(ac)->ac_multiaddrs); \
ETHER_NEXT_MULTI((step), (enm)); \
}
#ifdef _KERNEL
extern struct ifnet *myip_ifp;
int arpioctl(u_long, caddr_t);
void arprequest(struct ifnet *, u_int32_t *, u_int32_t *, u_int8_t *);
void revarpinput(struct mbuf *);
void in_revarpinput(struct mbuf *);
void revarprequest(struct ifnet *);
int revarpwhoarewe(struct ifnet *, struct in_addr *, struct in_addr *);
int revarpwhoami(struct in_addr *, struct ifnet *);
int db_show_arptab(void);
u_int32_t ether_crc32_le(const u_int8_t *, size_t);
u_int32_t ether_crc32_be(const u_int8_t *, size_t);
#else
__BEGIN_DECLS
char *ether_ntoa(struct ether_addr *);
struct ether_addr *ether_aton(const char *);
int ether_ntohost(char *, struct ether_addr *);
int ether_hostton(const char *, struct ether_addr *);
int ether_line(const char *, struct ether_addr *, char *);
__END_DECLS
#endif /* _KERNEL */
#endif /* _NETINET_IF_ETHER_H_ */
![[BACK]](/icons/back.gif){kind=icon}
Return to if_ether.h CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / netinet