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32 #ifndef _NET_IF_ARP_H_
33 #define _NET_IF_ARP_H_
36 * Address Resolution Protocol.
38 * See RFC 826 for protocol description. ARP packets are variable
39 * in size; the arphdr structure defines the fixed-length portion.
40 * Protocol type values are the same as those for 10 Mb/s Ethernet.
41 * It is followed by the variable-sized fields ar_sha, arp_spa,
42 * arp_tha and arp_tpa in that order, according to the lengths
43 * specified. Field names used correspond to RFC 826.
46 u_short ar_hrd; /* format of hardware address */
47 #define ARPHRD_ETHER 1 /* ethernet hardware format */
48 #define ARPHRD_IEEE802 6 /* token-ring hardware format */
49 #define ARPHRD_FRELAY 15 /* frame relay hardware format */
50 #define ARPHRD_IEEE1394 24 /* firewire hardware format */
51 #define ARPHRD_INFINIBAND 32 /* infiniband hardware format */
52 u_short ar_pro; /* format of protocol address */
53 u_char ar_hln; /* length of hardware address */
54 u_char ar_pln; /* length of protocol address */
55 u_short ar_op; /* one of: */
56 #define ARPOP_REQUEST 1 /* request to resolve address */
57 #define ARPOP_REPLY 2 /* response to previous request */
58 #define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
59 #define ARPOP_REVREPLY 4 /* response giving protocol address */
60 #define ARPOP_INVREQUEST 8 /* request to identify peer */
61 #define ARPOP_INVREPLY 9 /* response identifying peer */
63 * The remaining fields are variable in size,
64 * according to the sizes above.
67 u_char ar_sha[]; /* sender hardware address */
68 u_char ar_spa[]; /* sender protocol address */
69 u_char ar_tha[]; /* target hardware address */
70 u_char ar_tpa[]; /* target protocol address */
74 #define ar_sha(ap) (((caddr_t)((ap)+1)) + 0)
75 #define ar_spa(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln)
76 #define ar_tha(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln + (ap)->ar_pln)
77 #define ar_tpa(ap) (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln)
79 #define arphdr_len2(ar_hln, ar_pln) \
80 (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln))
81 #define arphdr_len(ap) (arphdr_len2((ap)->ar_hln, (ap)->ar_pln))
87 struct sockaddr arp_pa; /* protocol address */
88 struct sockaddr arp_ha; /* hardware address */
89 int arp_flags; /* flags */
91 /* arp_flags and at_flags field values */
92 #define ATF_INUSE 0x01 /* entry in use */
93 #define ATF_COM 0x02 /* completed entry (enaddr valid) */
94 #define ATF_PERM 0x04 /* permanent entry */
95 #define ATF_PUBL 0x08 /* publish entry (respond for other host) */
96 #define ATF_USETRAILERS 0x10 /* has requested trailers */
99 /* Normal things that happen: */
100 uint64_t txrequests; /* # of ARP requests sent by this host. */
101 uint64_t txreplies; /* # of ARP replies sent by this host. */
102 uint64_t rxrequests; /* # of ARP requests received by this host. */
103 uint64_t rxreplies; /* # of ARP replies received by this host. */
104 uint64_t received; /* # of ARP packets received by this host. */
105 uint64_t txerrors; /* # of ARP requests failed to send. */
107 uint64_t arp_spares[3]; /* For either the upper or lower half. */
108 /* Abnormal event and error counting: */
109 uint64_t dropped; /* # of packets dropped waiting for a reply. */
110 uint64_t timeouts; /* # of times with entries removed */
111 /* due to timeout. */
112 uint64_t dupips; /* # of duplicate IPs detected. */
116 #include <sys/counter.h>
117 #include <net/vnet.h>
119 VNET_PCPUSTAT_DECLARE(struct arpstat, arpstat);
121 * In-kernel consumers can use these accessor macros directly to update
124 #define ARPSTAT_ADD(name, val) \
125 VNET_PCPUSTAT_ADD(struct arpstat, arpstat, name, (val))
126 #define ARPSTAT_SUB(name, val) ARPSTAT_ADD(name, -(val))
127 #define ARPSTAT_INC(name) ARPSTAT_ADD(name, 1)
128 #define ARPSTAT_DEC(name) ARPSTAT_SUB(name, 1)
132 #endif /* !_NET_IF_ARP_H_ */