104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
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/*
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* arp.h
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*
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* Address Resolution Protocol.
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* RFC 826
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*
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* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
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*
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* $Id: arp.h,v 1.12 2003/03/16 17:39:17 dugsong Exp $
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*/
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#ifndef DNET_ARP_H
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#define DNET_ARP_H
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#define ARP_HDR_LEN 8 /* base ARP header length */
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#define ARP_ETHIP_LEN 20 /* base ARP message length */
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#ifndef __GNUC__
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# define __attribute__(x)
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# pragma pack(1)
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#endif
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/*
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* ARP header
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*/
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struct arp_hdr {
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uint16_t ar_hrd; /* format of hardware address */
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uint16_t ar_pro; /* format of protocol address */
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uint8_t ar_hln; /* length of hardware address (ETH_ADDR_LEN) */
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uint8_t ar_pln; /* length of protocol address (IP_ADDR_LEN) */
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uint16_t ar_op; /* operation */
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};
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/*
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* Hardware address format
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*/
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#define ARP_HRD_ETH 0x0001 /* ethernet hardware */
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#define ARP_HRD_IEEE802 0x0006 /* IEEE 802 hardware */
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/*
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* Protocol address format
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*/
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#define ARP_PRO_IP 0x0800 /* IP protocol */
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/*
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* ARP operation
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*/
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#define ARP_OP_REQUEST 1 /* request to resolve ha given pa */
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#define ARP_OP_REPLY 2 /* response giving hardware address */
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#define ARP_OP_REVREQUEST 3 /* request to resolve pa given ha */
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#define ARP_OP_REVREPLY 4 /* response giving protocol address */
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/*
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* Ethernet/IP ARP message
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*/
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struct arp_ethip {
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uint8_t ar_sha[ETH_ADDR_LEN]; /* sender hardware address */
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uint8_t ar_spa[IP_ADDR_LEN]; /* sender protocol address */
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uint8_t ar_tha[ETH_ADDR_LEN]; /* target hardware address */
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uint8_t ar_tpa[IP_ADDR_LEN]; /* target protocol address */
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};
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/*
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* ARP cache entry
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*/
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struct arp_entry {
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struct addr arp_pa; /* protocol address */
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struct addr arp_ha; /* hardware address */
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};
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#ifndef __GNUC__
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# pragma pack()
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#endif
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#define arp_pack_hdr_ethip(hdr, op, sha, spa, tha, tpa) do { \
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struct arp_hdr *pack_arp_p = (struct arp_hdr *)(hdr); \
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struct arp_ethip *pack_ethip_p = (struct arp_ethip *) \
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((uint8_t *)(hdr) + ARP_HDR_LEN); \
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pack_arp_p->ar_hrd = htons(ARP_HRD_ETH); \
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pack_arp_p->ar_pro = htons(ARP_PRO_IP); \
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pack_arp_p->ar_hln = ETH_ADDR_LEN; \
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pack_arp_p->ar_pln = IP_ADDR_LEN; \
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pack_arp_p->ar_op = htons(op); \
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memmove(pack_ethip_p->ar_sha, &(sha), ETH_ADDR_LEN); \
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memmove(pack_ethip_p->ar_spa, &(spa), IP_ADDR_LEN); \
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memmove(pack_ethip_p->ar_tha, &(tha), ETH_ADDR_LEN); \
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memmove(pack_ethip_p->ar_tpa, &(tpa), IP_ADDR_LEN); \
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} while (0)
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typedef struct arp_handle arp_t;
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typedef int (*arp_handler)(const struct arp_entry *entry, void *arg);
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__BEGIN_DECLS
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arp_t *arp_open(void);
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int arp_add(arp_t *arp, const struct arp_entry *entry);
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int arp_delete(arp_t *arp, const struct arp_entry *entry);
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int arp_get(arp_t *arp, struct arp_entry *entry);
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int arp_loop(arp_t *arp, arp_handler callback, void *arg);
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arp_t *arp_close(arp_t *arp);
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__END_DECLS
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#endif /* DNET_ARP_H */
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