/*      $NetBSD: if_arp.h,v 1.43 2021/02/19 14:51:59 christos Exp $     */

/*
* Copyright (c) 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_arp.h    8.1 (Berkeley) 6/10/93
*/

#ifndef _NET_IF_ARP_H_
#define _NET_IF_ARP_H_
/*
* 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 {
       uint16_t ar_hrd;        /* format of hardware address */
#define ARPHRD_ETHER            1  /* ethernet hardware format */
#define ARPHRD_IEEE802          6  /* IEEE 802 hardware format */
#define ARPHRD_ARCNET           7  /* ethernet hardware format */
#define ARPHRD_FRELAY           15 /* frame relay hardware format */
#define ARPHRD_STRIP            23 /* Ricochet Starmode Radio hardware format */
#define ARPHRD_IEEE1394         24 /* IEEE 1394 (FireWire) hardware format */
       uint16_t ar_pro;           /* format of protocol address */
       uint8_t  ar_hln;           /* length of hardware address */
       uint8_t  ar_pln;           /* length of protocol address */
       uint16_t ar_op;            /* one of: */
#define ARPOP_REQUEST           1  /* request to resolve address */
#define ARPOP_REPLY             2  /* response to previous request */
#define ARPOP_REVREQUEST        3  /* request protocol address given hardware */
#define ARPOP_REVREPLY          4  /* response giving protocol address */
#define ARPOP_INVREQUEST        8  /* request to identify peer */
#define ARPOP_INVREPLY          9  /* response identifying peer */
/*
* The remaining fields are variable in size,
* according to the sizes above.
*/
#ifdef COMMENT_ONLY
       uint8_t  ar_sha[];      /* sender hardware address */
       uint8_t  ar_spa[];      /* sender protocol address */
       uint8_t  ar_tha[];      /* target hardware address (!IEEE1394) */
       uint8_t  ar_tpa[];      /* target protocol address */
#endif
};

static __inline uint8_t *
ar_data(struct arphdr *ap)
{
       return (uint8_t *)(void *)(ap + 1);
}

static __inline uint8_t *
ar_sha(struct arphdr *ap)
{
       return ar_data(ap) + 0;
}

static __inline uint8_t *
ar_spa(struct arphdr *ap)
{
       return ar_data(ap) + ap->ar_hln;
}

static __inline uint8_t *
ar_tha(struct arphdr *ap)
{
       if (ntohs(ap->ar_hrd) == ARPHRD_IEEE1394) {
               return NULL;
       } else {
               return ar_data(ap) + ap->ar_hln + ap->ar_pln;
       }
}

static __inline uint8_t *
ar_tpa(struct arphdr *ap)
{
       if (ntohs(ap->ar_hrd) == ARPHRD_IEEE1394) {
               return ar_data(ap) + ap->ar_hln + ap->ar_pln;
       } else {
               return ar_data(ap) + ap->ar_hln + ap->ar_pln + ap->ar_hln;
       }
}

/*
* ARP ioctl request
*/
struct arpreq {
       struct  sockaddr arp_pa;                /* protocol address */
       struct  sockaddr arp_ha;                /* hardware address */
       int     arp_flags;                      /* flags */
};
/*  arp_flags and at_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 */

/*
* Kernel statistics about arp
*/
#define ARP_STAT_SNDTOTAL       0       /* total packets sent */
#define ARP_STAT_SNDREPLY       1       /* replies sent */
#define ARP_STAT_SENDREQUEST    2       /* requests sent */
#define ARP_STAT_RCVTOTAL       3       /* total packets received */
#define ARP_STAT_RCVREQUEST     4       /* valid requests received */
#define ARP_STAT_RCVREPLY       5       /* replies received */
#define ARP_STAT_RCVMCAST       6       /* multicast/broadcast received */
#define ARP_STAT_RCVBADPROTO    7       /* unknown protocol type received */
#define ARP_STAT_RCVBADLEN      8       /* bad (short) length received */
#define ARP_STAT_RCVZEROTPA     9       /* received w/ null target ip */
#define ARP_STAT_RCVZEROSPA     10      /* received w/ null source ip */
#define ARP_STAT_RCVNOINT       11      /* couldn't map to interface */
#define ARP_STAT_RCVLOCALSHA    12      /* received from local hw address */
#define ARP_STAT_RCVBCASTSHA    13      /* received w/ broadcast src */
#define ARP_STAT_RCVLOCALSPA    14      /* received for a local ip [dup!] */
#define ARP_STAT_RCVOVERPERM    15      /* attempts to overwrite static info */
#define ARP_STAT_RCVOVERINT     16      /* attempts to overwrite wrong if */
#define ARP_STAT_RCVOVER        17      /* entries overwritten! */
#define ARP_STAT_RCVLENCHG      18      /* changes in hw address len */
#define ARP_STAT_DFRTOTAL       19      /* deferred pending ARP resolution */
#define ARP_STAT_DFRSENT        20      /* deferred, then sent */
#define ARP_STAT_DFRDROPPED     21      /* deferred, then dropped */
#define ARP_STAT_ALLOCFAIL      22      /* failures to allocate llinfo */

#define ARP_NSTATS              23

void arp_stat_add(int, uint64_t);

#endif /* !_NET_IF_ARP_H_ */

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