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_MONITOR 805 /* IEEE 802.15.4 network monitor */ 91 92#define ARPHRD_PHONET 820 /* PhoNet media type */ 93#define ARPHRD_PHONET_PIPE 821 /* PhoNet pipe header */ 94#define ARPHRD_CAIF 822 /* CAIF media type */ 95 96#define ARPHRD_VOID 0xFFFF /* Void type, nothing is known */ 97#define ARPHRD_NONE 0xFFFE /* zero header length */ 98 99/* ARP protocol opcodes. */ 100#define ARPOP_REQUEST 1 /* ARP request */ 101#define ARPOP_REPLY 2 /* ARP reply */ 102#define ARPOP_RREQUEST 3 /* RARP request */ 103#define ARPOP_RREPLY 4 /* RARP reply */ 104#define ARPOP_InREQUEST 8 /* InARP request */ 105#define ARPOP_InREPLY 9 /* InARP reply */ 106#define ARPOP_NAK 10 /* (ATM)ARP NAK */ 107 108 109/* ARP ioctl request. */ 110struct arpreq { 111 struct sockaddr arp_pa; /* protocol address */ 112 struct sockaddr arp_ha; /* hardware address */ 113 int arp_flags; /* flags */ 114 struct sockaddr arp_netmask; /* netmask (only for proxy arps) */ 115 char arp_dev[16]; 116}; 117 118struct arpreq_old { 119 struct sockaddr arp_pa; /* protocol address */ 120 struct sockaddr arp_ha; /* hardware address */ 121 int arp_flags; /* flags */ 122 struct sockaddr arp_netmask; /* netmask (only for proxy arps) */ 123}; 124 125/* ARP Flag values. */ 126#define ATF_COM 0x02 /* completed entry (ha valid) */ 127#define ATF_PERM 0x04 /* permanent entry */ 128#define ATF_PUBL 0x08 /* publish entry */ 129#define ATF_USETRAILERS 0x10 /* has requested trailers */ 130#define ATF_NETMASK 0x20 /* want to use a netmask (only 131 for proxy entries) */ 132#define ATF_DONTPUB 0x40 /* don't answer this addresses */ 133 134/* 135 * This structure defines an ethernet arp header. 136 */ 137 138struct arphdr { 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 160static inline struct arphdr *arp_hdr(const struct sk_buff *skb) 161{ 162 return (struct arphdr *)skb_network_header(skb); 163} 164 165static 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