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/* $NetBSD: arp.h,v 1.3 1994/10/27 04:21:03 cgd Exp $ */
/*
* source in this file came from
* the Mach ethernet boot written by Leendert van Doorn.
*
* Ethernet Address Resolution Protocol (see RFC 826)
*/
/*
* ARP packets are variable in size; the arphdr_t type defines the
* 10Mb Ethernet variant. Field names used correspond to RFC 826.
*/
typedef struct {
u_short arp_hrd; /* format of hardware address */
#define ARPHRD_ETHER 1 /* ethernet hardware address */
u_short arp_pro; /* format of proto. address */
u_char arp_hln; /* length of hardware address */
u_char arp_pln; /* length of protocol address */
u_short arp_op;
#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 */
u_char arp_sha[ETH_ADDRSIZE]; /* sender hardware address */
u_char arp_spa[4]; /* sender protocol address */
u_char arp_tha[ETH_ADDRSIZE]; /* target hardware address */
u_char arp_tpa[4]; /* target protocol address */
} arphdr_t;
/*
* Internet to hardware address resolution table
*/
typedef struct {
ipaddr_t at_ipaddr; /* internet address */
u_char at_eaddr[ETH_ADDRSIZE]; /* ethernet address */
u_long at_timer; /* time when referenced */
u_char at_flags; /* flags */
packet_t *at_hold; /* ast packet until resolved/timeout */
} arptab_t;
/* at_flags field values */
#define ATF_INUSE 1 /* entry in use */
#define ATF_COM 2 /* completed entry (eaddr valid) */
#define ARPTAB_BSIZ 3 /* bucket size */
#define ARPTAB_NB 2 /* number of buckets */
#define ARPTAB_SIZE (ARPTAB_BSIZ * ARPTAB_NB)
#define ARPTAB_HASH(a) \
((short)((((a) >> 16) ^ (a)) & 0x7fff) % ARPTAB_NB)
#define ARPTAB_LOOK(at, addr) { \
register n; \
at = &arptab[ARPTAB_HASH(addr) * ARPTAB_BSIZ]; \
for (n = 0; n < ARPTAB_BSIZ; n++, at++) \
if (at->at_ipaddr == addr) \
break; \
if (n >= ARPTAB_BSIZ) \
at = 0; }
ipaddr_t GetIpAddress(ipaddr_t *server, ipaddr_t *my_addr, ipaddr_t *gateway, char *filename);
void ArpInput(packet_t *);
int ArpResolve(packet_t *, ipaddr_t, u_char *);
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