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      1 /*
      2  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
      3  * Use is subject to license terms.
      4  */
      5 
      6 /*
      7  * Copyright (c) 1982, 1986 Regents of the University of California.
      8  * All rights reserved. The Berkeley software License Agreement
      9  * specifies the terms and conditions for redistribution.
     10  */
     11 
     12 #ifndef	_NETINET_ARP_H
     13 #define	_NETINET_ARP_H
     14 
     15 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     16 
     17 #include <sys/types.h>
     18 #include <sys/ethernet.h>
     19 #include <sys/socket.h>
     20 
     21 #ifdef	__cplusplus
     22 extern "C" {
     23 #endif
     24 
     25 /*
     26  * Address Resolution Protocol.
     27  *
     28  * See RFC 826 for protocol description.  ARP packets are variable
     29  * in size; the arphdr structure defines the fixed-length portion.
     30  * Protocol type values are the same as those for 10 Mb/s Ethernet.
     31  * It is followed by the variable-sized fields ar_sha, arp_spa,
     32  * arp_tha and arp_tpa in that order, according to the lengths
     33  * specified.  Field names used correspond to RFC 826.
     34  */
     35 struct	arphdr {
     36 	ushort_t ar_hrd;	/* format of hardware address */
     37 #define	ARPHRD_ETHER 	1	/* ethernet hardware address */
     38 #define	ARPHRD_IEEE802 	6	/* IEEE 802 hardware address */
     39 #define	ARPHRD_FRAME	15	/* Frame relay */
     40 #define	ARPHRD_ATM	16	/* ATM */
     41 #define	ARPHRD_HDLC	17	/* HDLC */
     42 #define	ARPHRD_FC	18	/* Fibre Channel RFC 4338 */
     43 #define	ARPHRD_IPATM	19	/* ATM RFC 2225 */
     44 #define	ARPHRD_TUNNEL	31	/* IPsec Tunnel RFC 3456 */
     45 #define	ARPHRD_IB	32	/* IPoIB hardware address */
     46 	ushort_t ar_pro;	/* format of protocol address */
     47 	uchar_t	ar_hln;		/* length of hardware address */
     48 	uchar_t	ar_pln;		/* length of protocol address */
     49 	ushort_t ar_op;		/* one of: */
     50 #define	ARPOP_REQUEST	1	/* request to resolve address */
     51 #define	ARPOP_REPLY	2	/* response to previous request */
     52 #define	REVARP_REQUEST	3	/* Reverse ARP request */
     53 #define	REVARP_REPLY	4	/* Reverse ARP reply */
     54 	/*
     55 	 * The remaining fields are variable in size,
     56 	 * according to the sizes above, and are defined
     57 	 * as appropriate for specific hardware/protocol
     58 	 * combinations.  (E.g., see <netinet/if_ether.h>.)
     59 	 */
     60 #ifdef	notdef
     61 	uchar_t	ar_sha[];	/* sender hardware address */
     62 	uchar_t	ar_spa[];	/* sender protocol address */
     63 	uchar_t	ar_tha[];	/* target hardware address */
     64 	uchar_t	ar_tpa[];	/* target protocol address */
     65 #endif	/* notdef */
     66 };
     67 
     68 /* Maximum hardware and protocol address length */
     69 #define	ARP_MAX_ADDR_LEN	255
     70 
     71 /*
     72  * Ethernet Address Resolution Protocol.
     73  *
     74  * See RFC 826 for protocol description.  Structure below is adapted
     75  * to resolving internet addresses.  Field names used correspond to
     76  * RFC 826.
     77  */
     78 struct	ether_arp {
     79 	struct	arphdr ea_hdr;		/* fixed-size header */
     80 	struct ether_addr arp_sha;	/* sender hardware address */
     81 	uchar_t	arp_spa[4];		/* sender protocol address */
     82 	struct ether_addr arp_tha;	/* target hardware address */
     83 	uchar_t	arp_tpa[4];		/* target protocol address */
     84 };
     85 #define	arp_hrd	ea_hdr.ar_hrd
     86 #define	arp_pro	ea_hdr.ar_pro
     87 #define	arp_hln	ea_hdr.ar_hln
     88 #define	arp_pln	ea_hdr.ar_pln
     89 #define	arp_op	ea_hdr.ar_op
     90 
     91 /*
     92  * ARP ioctl request
     93  */
     94 struct arpreq {
     95 	struct	sockaddr arp_pa;		/* protocol address */
     96 	struct	sockaddr arp_ha;		/* hardware address */
     97 	int	arp_flags;			/* flags */
     98 };
     99 /*  arp_flags field values */
    100 #define	ATF_INUSE	0x01	/* entry in use */
    101 #define	ATF_COM		0x02	/* completed entry (enaddr valid) */
    102 #define	ATF_PERM	0x04	/* permanent entry */
    103 #define	ATF_PUBL	0x08	/* publish entry (respond for other host) */
    104 #define	ATF_USETRAILERS	0x10	/* has requested trailers */
    105 #define	ATF_AUTHORITY	0x20	/* hardware address is authoritative */
    106 
    107 #ifdef	__cplusplus
    108 }
    109 #endif
    110 
    111 #endif	/* _NETINET_ARP_H */
    112