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29 * @(#)if_arp.h 8.1 (Berkeley) 6/10/93
33 #ifndef _NET_IF_ARP_H_
34 #define _NET_IF_ARP_H_
37 * Address Resolution Protocol.
39 * See RFC 826 for protocol description. ARP packets are variable
40 * in size; the arphdr structure defines the fixed-length portion.
41 * Protocol type values are the same as those for 10 Mb/s Ethernet.
42 * It is followed by the variable-sized fields ar_sha, arp_spa,
43 * arp_tha and arp_tpa in that order, according to the lengths
44 * specified. Field names used correspond to RFC 826.
47 u_short ar_hrd; /* format of hardware address */
48 #define ARPHRD_ETHER 1 /* ethernet hardware format */
49 #define ARPHRD_IEEE802 6 /* token-ring hardware format */
50 #define ARPHRD_ARCNET 7 /* arcnet hardware format */
51 #define ARPHRD_FRELAY 15 /* frame relay hardware format */
52 #define ARPHRD_IEEE1394 24 /* firewire hardware format */
53 u_short ar_pro; /* format of protocol address */
54 u_char ar_hln; /* length of hardware address */
55 u_char ar_pln; /* length of protocol address */
56 u_short ar_op; /* one of: */
57 #define ARPOP_REQUEST 1 /* request to resolve address */
58 #define ARPOP_REPLY 2 /* response to previous request */
59 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
60 #define ARPOP_REVREPLY 4 /* response giving protocol address */
61 #define ARPOP_INVREQUEST 8 /* request to identify peer */
62 #define ARPOP_INVREPLY 9 /* response identifying peer */
64 * The remaining fields are variable in size,
65 * according to the sizes above.
68 u_char ar_sha[]; /* sender hardware address */
69 u_char ar_spa[]; /* sender protocol address */
70 u_char ar_tha[]; /* target hardware address */
71 u_char ar_tpa[]; /* target protocol address */
75 #define ar_sha(ap) (((caddr_t)((ap)+1)) + 0)
76 #define ar_spa(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln)
77 #define ar_tha(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln + (ap)->ar_pln)
78 #define ar_tpa(ap) (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln)
80 #define arphdr_len2(ar_hln, ar_pln) \
81 (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln))
82 #define arphdr_len(ap) (arphdr_len2((ap)->ar_hln, (ap)->ar_pln))
88 struct sockaddr arp_pa; /* protocol address */
89 struct sockaddr arp_ha; /* hardware address */
90 int arp_flags; /* flags */
92 /* arp_flags and at_flags field values */
93 #define ATF_INUSE 0x01 /* entry in use */
94 #define ATF_COM 0x02 /* completed entry (enaddr valid) */
95 #define ATF_PERM 0x04 /* permanent entry */
96 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */
97 #define ATF_USETRAILERS 0x10 /* has requested trailers */
101 * Structure shared between the ethernet driver modules and
102 * the address resolution code.
105 struct ifnet *ac_ifp; /* network-visible interface */
106 void *ac_netgraph; /* ng_ether(4) netgraph node info */
108 #define IFP2AC(ifp) ((struct arpcom *)(ifp->if_l2com))
109 #define AC2IFP(ac) ((ac)->ac_ifp)
113 #endif /* !_NET_IF_ARP_H_ */