arp.h revision d04ccbb3f3163ae5962a8b7465d9796bff6ca434
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef _NETINET_ARP_H
#define _NETINET_ARP_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/ethernet.h>
#include <sys/socket.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* Address Resolution Protocol.
*
* See RFC 826 for protocol description. ARP packets are variable
* in size; the arphdr structure defines the fixed-length portion.
* Protocol type values are the same as those for 10 Mb/s Ethernet.
* It is followed by the variable-sized fields ar_sha, arp_spa,
* arp_tha and arp_tpa in that order, according to the lengths
* specified. Field names used correspond to RFC 826.
*/
struct arphdr {
ushort_t ar_hrd; /* format of hardware address */
#define ARPHRD_ETHER 1 /* ethernet hardware address */
#define ARPHRD_IEEE802 6 /* IEEE 802 hardware address */
#define ARPHRD_FRAME 15 /* Frame relay */
#define ARPHRD_ATM 16 /* ATM */
#define ARPHRD_HDLC 17 /* HDLC */
#define ARPHRD_FC 18 /* Fibre Channel RFC 4338 */
#define ARPHRD_IPATM 19 /* ATM RFC 2225 */
#define ARPHRD_TUNNEL 31 /* IPsec Tunnel RFC 3456 */
#define ARPHRD_IB 32 /* IPoIB hardware address */
ushort_t ar_pro; /* format of protocol address */
uchar_t ar_hln; /* length of hardware address */
uchar_t ar_pln; /* length of protocol address */
ushort_t ar_op; /* one of: */
#define ARPOP_REQUEST 1 /* request to resolve address */
#define ARPOP_REPLY 2 /* response to previous request */
#define REVARP_REQUEST 3 /* Reverse ARP request */
#define REVARP_REPLY 4 /* Reverse ARP reply */
/*
* The remaining fields are variable in size,
* according to the sizes above, and are defined
* as appropriate for specific hardware/protocol
* combinations. (E.g., see <netinet/if_ether.h>.)
*/
#ifdef notdef
uchar_t ar_sha[]; /* sender hardware address */
uchar_t ar_spa[]; /* sender protocol address */
uchar_t ar_tha[]; /* target hardware address */
uchar_t ar_tpa[]; /* target protocol address */
#endif /* notdef */
};
/* Maximum hardware and protocol address length */
#define ARP_MAX_ADDR_LEN 255
/*
* 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 */
struct ether_addr arp_sha; /* sender hardware address */
uchar_t arp_spa[4]; /* sender protocol address */
struct ether_addr arp_tha; /* target hardware address */
uchar_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
/*
* ARP ioctl request
*/
struct arpreq {
struct sockaddr arp_pa; /* protocol address */
struct sockaddr arp_ha; /* hardware address */
int arp_flags; /* flags */
};
/* arp_flags field values */
#define ATF_INUSE 0x01 /* entry in use */
#define ATF_COM 0x02 /* completed entry (enaddr valid) */
#define ATF_PERM 0x04 /* permanent entry */
#define ATF_PUBL 0x08 /* publish entry (respond for other host) */
#define ATF_USETRAILERS 0x10 /* has requested trailers */
#define ATF_AUTHORITY 0x20 /* hardware address is authoritative */
#ifdef __cplusplus
}
#endif
#endif /* _NETINET_ARP_H */