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48ff61a710
This type is used by OpenVZ venet interfaces. We "handle" such an address type just by blanking the MAC address field. Lack of support for this type of interface was preventing Nmap from working on certain systems. http://seclists.org/nmap-dev/2012/q2/763 An earlier message about this same type of interface is http://seclists.org/nmap-dev/2009/q3/303
109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/*
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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 416 2003-03-16 17:39:18Z dugsong $
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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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#ifndef __attribute__
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# define __attribute__(x)
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#endif
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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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#define ARP_HRD_IEEE80211_RADIOTAP 0x0323 /* IEEE 802.11 + radiotap header */
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#define ARP_HRD_VOID 0xFFFF /* Void type, nothing is known */
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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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