1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Global definitions for the ARP (RFC 826) protocol.
7 *
8 * Version: @(#)if_arp.h 1.0.1 04/16/93
9 *
10 * Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
11 * Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
12 * Ross Biro
13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Florian La Roche,
15 * Jonathan Layes <layes@loran.com>
16 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23 #ifndef _LINUX_IF_ARP_H
24 #define _LINUX_IF_ARP_H
25
26 #include <linux/netdevice.h>
27
28 /* ARP protocol HARDWARE identifiers. */
29 #define ARPHRD_NETROM 0 /* from KA9Q: NET/ROM pseudo */
30 #define ARPHRD_ETHER 1 /* Ethernet 10Mbps */
31 #define ARPHRD_EETHER 2 /* Experimental Ethernet */
32 #define ARPHRD_AX25 3 /* AX.25 Level 2 */
33 #define ARPHRD_PRONET 4 /* PROnet token ring */
34 #define ARPHRD_CHAOS 5 /* Chaosnet */
35 #define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB */
36 #define ARPHRD_ARCNET 7 /* ARCnet */
37 #define ARPHRD_APPLETLK 8 /* APPLEtalk */
38 #define ARPHRD_DLCI 15 /* Frame Relay DLCI */
39 #define ARPHRD_ATM 19 /* ATM */
40 #define ARPHRD_METRICOM 23 /* Metricom STRIP (new IANA id) */
41 #define ARPHRD_IEEE1394 24 /* IEEE 1394 IPv4 - RFC 2734 */
42 #define ARPHRD_EUI64 27 /* EUI-64 */
43 #define ARPHRD_INFINIBAND 32 /* InfiniBand */
44
45 /* Dummy types for non ARP hardware */
46 #define ARPHRD_SLIP 256
47 #define ARPHRD_CSLIP 257
48 #define ARPHRD_SLIP6 258
49 #define ARPHRD_CSLIP6 259
50 #define ARPHRD_RSRVD 260 /* Notional KISS type */
51 #define ARPHRD_ADAPT 264
52 #define ARPHRD_ROSE 270
53 #define ARPHRD_X25 271 /* CCITT X.25 */
54 #define ARPHRD_HWX25 272 /* Boards with X.25 in firmware */
55 #define ARPHRD_CAN 280 /* Controller Area Network */
56 #define ARPHRD_PPP 512
57 #define ARPHRD_CISCO 513 /* Cisco HDLC */
58 #define ARPHRD_HDLC ARPHRD_CISCO
59 #define ARPHRD_LAPB 516 /* LAPB */
60 #define ARPHRD_DDCMP 517 /* Digital's DDCMP protocol */
61 #define ARPHRD_RAWHDLC 518 /* Raw HDLC */
62
63 #define ARPHRD_TUNNEL 768 /* IPIP tunnel */
64 #define ARPHRD_TUNNEL6 769 /* IP6IP6 tunnel */
65 #define ARPHRD_FRAD 770 /* Frame Relay Access Device */
66 #define ARPHRD_SKIP 771 /* SKIP vif */
67 #define ARPHRD_LOOPBACK 772 /* Loopback device */
68 #define ARPHRD_LOCALTLK 773 /* Localtalk device */
69 #define ARPHRD_FDDI 774 /* Fiber Distributed Data Interface */
70 #define ARPHRD_BIF 775 /* AP1000 BIF */
71 #define ARPHRD_SIT 776 /* sit0 device - IPv6-in-IPv4 */
72 #define ARPHRD_IPDDP 777 /* IP over DDP tunneller */
73 #define ARPHRD_IPGRE 778 /* GRE over IP */
74 #define ARPHRD_PIMREG 779 /* PIMSM register interface */
75 #define ARPHRD_HIPPI 780 /* High Performance Parallel Interface */
76 #define ARPHRD_ASH 781 /* Nexus 64Mbps Ash */
77 #define ARPHRD_ECONET 782 /* Acorn Econet */
78 #define ARPHRD_IRDA 783 /* Linux-IrDA */
79 /* ARP works differently on different FC media .. so */
80 #define ARPHRD_FCPP 784 /* Point to point fibrechannel */
81 #define ARPHRD_FCAL 785 /* Fibrechannel arbitrated loop */
82 #define ARPHRD_FCPL 786 /* Fibrechannel public loop */
83 #define ARPHRD_FCFABRIC 787 /* Fibrechannel fabric */
84 /* 787->799 reserved for fibrechannel media types */
85 #define ARPHRD_IEEE802_TR 800 /* Magic type ident for TR */
86 #define ARPHRD_IEEE80211 801 /* IEEE 802.11 */
87 #define ARPHRD_IEEE80211_PRISM 802 /* IEEE 802.11 + Prism2 header */
88 #define ARPHRD_IEEE80211_RADIOTAP 803 /* IEEE 802.11 + radiotap header */
89 #define ARPHRD_IEEE802154 804
90 #define ARPHRD_IEEE802154_PHY 805
91
92 #define ARPHRD_PHONET 820 /* PhoNet media type */
93 #define ARPHRD_PHONET_PIPE 821 /* PhoNet pipe header */
94
95 #define ARPHRD_VOID 0xFFFF /* Void type, nothing is known */
96 #define ARPHRD_NONE 0xFFFE /* zero header length */
97
98 /* ARP protocol opcodes. */
99 #define ARPOP_REQUEST 1 /* ARP request */
100 #define ARPOP_REPLY 2 /* ARP reply */
101 #define ARPOP_RREQUEST 3 /* RARP request */
102 #define ARPOP_RREPLY 4 /* RARP reply */
103 #define ARPOP_InREQUEST 8 /* InARP request */
104 #define ARPOP_InREPLY 9 /* InARP reply */
105 #define ARPOP_NAK 10 /* (ATM)ARP NAK */
106
107
108 /* ARP ioctl request. */
109 struct arpreq {
110 struct sockaddr arp_pa; /* protocol address */
111 struct sockaddr arp_ha; /* hardware address */
112 int arp_flags; /* flags */
113 struct sockaddr arp_netmask; /* netmask (only for proxy arps) */
114 char arp_dev[16];
115 };
116
117 struct arpreq_old {
118 struct sockaddr arp_pa; /* protocol address */
119 struct sockaddr arp_ha; /* hardware address */
120 int arp_flags; /* flags */
121 struct sockaddr arp_netmask; /* netmask (only for proxy arps) */
122 };
123
124 /* ARP Flag values. */
125 #define ATF_COM 0x02 /* completed entry (ha valid) */
126 #define ATF_PERM 0x04 /* permanent entry */
127 #define ATF_PUBL 0x08 /* publish entry */
128 #define ATF_USETRAILERS 0x10 /* has requested trailers */
129 #define ATF_NETMASK 0x20 /* want to use a netmask (only
130 for proxy entries) */
131 #define ATF_DONTPUB 0x40 /* don't answer this addresses */
132
133 /*
134 * This structure defines an ethernet arp header.
135 */
136
137 struct arphdr
138 {
139 __be16 ar_hrd; /* format of hardware address */
140 __be16 ar_pro; /* format of protocol address */
141 unsigned char ar_hln; /* length of hardware address */
142 unsigned char ar_pln; /* length of protocol address */
143 __be16 ar_op; /* ARP opcode (command) */
144
145 #if 0
146 /*
147 * Ethernet looks like this : This bit is variable sized however...
148 */
149 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
150 unsigned char ar_sip[4]; /* sender IP address */
151 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
152 unsigned char ar_tip[4]; /* target IP address */
153 #endif
154
155 };
156
157 #ifdef __KERNEL__
158 #include <linux/skbuff.h>
159
160 static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
161 {
162 return (struct arphdr *)skb_network_header(skb);
163 }
164
165 static inline int arp_hdr_len(struct net_device *dev)
166 {
167 /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
168 return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
169 }
170 #endif
171
172 #endif /* _LINUX_IF_ARP_H */
173
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