65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/*
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* source in this file came from
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* the Mach ethernet boot written by Leendert van Doorn.
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*
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* Ethernet Address Resolution Protocol (see RFC 826)
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*
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* $Id: arp.h,v 1.2 1993/08/02 17:52:47 mycroft Exp $
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*/
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/*
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* ARP packets are variable in size; the arphdr_t type defines the
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* 10Mb Ethernet variant. Field names used correspond to RFC 826.
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*/
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typedef struct {
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u_short arp_hrd; /* format of hardware address */
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#define ARPHRD_ETHER 1 /* ethernet hardware address */
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u_short arp_pro; /* format of proto. address */
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u_char arp_hln; /* length of hardware address */
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u_char arp_pln; /* length of protocol address */
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u_short arp_op;
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#define ARPOP_REQUEST 1 /* request to resolve address */
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#define ARPOP_REPLY 2 /* response to previous request */
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#define REVARP_REQUEST 3 /* reverse ARP request */
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#define REVARP_REPLY 4 /* reverse ARP reply */
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u_char arp_sha[ETH_ADDRSIZE]; /* sender hardware address */
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u_char arp_spa[4]; /* sender protocol address */
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u_char arp_tha[ETH_ADDRSIZE]; /* target hardware address */
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u_char arp_tpa[4]; /* target protocol address */
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} arphdr_t;
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/*
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* Internet to hardware address resolution table
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*/
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typedef struct {
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ipaddr_t at_ipaddr; /* internet address */
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u_char at_eaddr[ETH_ADDRSIZE]; /* ethernet address */
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u_long at_timer; /* time when referenced */
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u_char at_flags; /* flags */
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packet_t *at_hold; /* ast packet until resolved/timeout */
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} arptab_t;
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/* at_flags field values */
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#define ATF_INUSE 1 /* entry in use */
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#define ATF_COM 2 /* completed entry (eaddr valid) */
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#define ARPTAB_BSIZ 3 /* bucket size */
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#define ARPTAB_NB 2 /* number of buckets */
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#define ARPTAB_SIZE (ARPTAB_BSIZ * ARPTAB_NB)
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#define ARPTAB_HASH(a) \
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((short)((((a) >> 16) ^ (a)) & 0x7fff) % ARPTAB_NB)
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#define ARPTAB_LOOK(at, addr) { \
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register n; \
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at = &arptab[ARPTAB_HASH(addr) * ARPTAB_BSIZ]; \
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for (n = 0; n < ARPTAB_BSIZ; n++, at++) \
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if (at->at_ipaddr == addr) \
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break; \
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if (n >= ARPTAB_BSIZ) \
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at = 0; }
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ipaddr_t GetIpAddress(ipaddr_t *server, ipaddr_t *my_addr, ipaddr_t *gateway, char *filename);
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void ArpInput(packet_t *);
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int ArpResolve(packet_t *, ipaddr_t, u_char *);
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