988b705077
There are some place, that calculate the ARP header length. These calculations are correct, but a) some operate with "magic" constants, b) enlarge the code length (sometimes at the cost of coding style), c) are not informative from the first glance. The proposal is to introduce a helper, that includes all the good sides of these calculations. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
168 lines
6.2 KiB
C
168 lines
6.2 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Global definitions for the ARP (RFC 826) protocol.
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*
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* Version: @(#)if_arp.h 1.0.1 04/16/93
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*
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* Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
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* Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
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* Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Florian La Roche,
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* Jonathan Layes <layes@loran.com>
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_IF_ARP_H
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#define _LINUX_IF_ARP_H
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#include <linux/netdevice.h>
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/* ARP protocol HARDWARE identifiers. */
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#define ARPHRD_NETROM 0 /* from KA9Q: NET/ROM pseudo */
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#define ARPHRD_ETHER 1 /* Ethernet 10Mbps */
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#define ARPHRD_EETHER 2 /* Experimental Ethernet */
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#define ARPHRD_AX25 3 /* AX.25 Level 2 */
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#define ARPHRD_PRONET 4 /* PROnet token ring */
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#define ARPHRD_CHAOS 5 /* Chaosnet */
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#define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB */
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#define ARPHRD_ARCNET 7 /* ARCnet */
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#define ARPHRD_APPLETLK 8 /* APPLEtalk */
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#define ARPHRD_DLCI 15 /* Frame Relay DLCI */
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#define ARPHRD_ATM 19 /* ATM */
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#define ARPHRD_METRICOM 23 /* Metricom STRIP (new IANA id) */
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#define ARPHRD_IEEE1394 24 /* IEEE 1394 IPv4 - RFC 2734 */
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#define ARPHRD_EUI64 27 /* EUI-64 */
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#define ARPHRD_INFINIBAND 32 /* InfiniBand */
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/* Dummy types for non ARP hardware */
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#define ARPHRD_SLIP 256
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#define ARPHRD_CSLIP 257
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#define ARPHRD_SLIP6 258
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#define ARPHRD_CSLIP6 259
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#define ARPHRD_RSRVD 260 /* Notional KISS type */
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#define ARPHRD_ADAPT 264
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#define ARPHRD_ROSE 270
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#define ARPHRD_X25 271 /* CCITT X.25 */
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#define ARPHRD_HWX25 272 /* Boards with X.25 in firmware */
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#define ARPHRD_CAN 280 /* Controller Area Network */
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#define ARPHRD_PPP 512
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#define ARPHRD_CISCO 513 /* Cisco HDLC */
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#define ARPHRD_HDLC ARPHRD_CISCO
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#define ARPHRD_LAPB 516 /* LAPB */
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#define ARPHRD_DDCMP 517 /* Digital's DDCMP protocol */
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#define ARPHRD_RAWHDLC 518 /* Raw HDLC */
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#define ARPHRD_TUNNEL 768 /* IPIP tunnel */
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#define ARPHRD_TUNNEL6 769 /* IP6IP6 tunnel */
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#define ARPHRD_FRAD 770 /* Frame Relay Access Device */
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#define ARPHRD_SKIP 771 /* SKIP vif */
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#define ARPHRD_LOOPBACK 772 /* Loopback device */
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#define ARPHRD_LOCALTLK 773 /* Localtalk device */
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#define ARPHRD_FDDI 774 /* Fiber Distributed Data Interface */
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#define ARPHRD_BIF 775 /* AP1000 BIF */
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#define ARPHRD_SIT 776 /* sit0 device - IPv6-in-IPv4 */
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#define ARPHRD_IPDDP 777 /* IP over DDP tunneller */
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#define ARPHRD_IPGRE 778 /* GRE over IP */
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#define ARPHRD_PIMREG 779 /* PIMSM register interface */
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#define ARPHRD_HIPPI 780 /* High Performance Parallel Interface */
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#define ARPHRD_ASH 781 /* Nexus 64Mbps Ash */
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#define ARPHRD_ECONET 782 /* Acorn Econet */
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#define ARPHRD_IRDA 783 /* Linux-IrDA */
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/* ARP works differently on different FC media .. so */
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#define ARPHRD_FCPP 784 /* Point to point fibrechannel */
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#define ARPHRD_FCAL 785 /* Fibrechannel arbitrated loop */
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#define ARPHRD_FCPL 786 /* Fibrechannel public loop */
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#define ARPHRD_FCFABRIC 787 /* Fibrechannel fabric */
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/* 787->799 reserved for fibrechannel media types */
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#define ARPHRD_IEEE802_TR 800 /* Magic type ident for TR */
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#define ARPHRD_IEEE80211 801 /* IEEE 802.11 */
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#define ARPHRD_IEEE80211_PRISM 802 /* IEEE 802.11 + Prism2 header */
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#define ARPHRD_IEEE80211_RADIOTAP 803 /* IEEE 802.11 + radiotap header */
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#define ARPHRD_VOID 0xFFFF /* Void type, nothing is known */
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#define ARPHRD_NONE 0xFFFE /* zero header length */
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/* ARP protocol opcodes. */
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#define ARPOP_REQUEST 1 /* ARP request */
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#define ARPOP_REPLY 2 /* ARP reply */
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#define ARPOP_RREQUEST 3 /* RARP request */
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#define ARPOP_RREPLY 4 /* RARP reply */
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#define ARPOP_InREQUEST 8 /* InARP request */
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#define ARPOP_InREPLY 9 /* InARP reply */
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#define ARPOP_NAK 10 /* (ATM)ARP NAK */
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/* ARP ioctl request. */
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struct arpreq {
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struct sockaddr arp_pa; /* protocol address */
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struct sockaddr arp_ha; /* hardware address */
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int arp_flags; /* flags */
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struct sockaddr arp_netmask; /* netmask (only for proxy arps) */
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char arp_dev[16];
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};
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struct arpreq_old {
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struct sockaddr arp_pa; /* protocol address */
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struct sockaddr arp_ha; /* hardware address */
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int arp_flags; /* flags */
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struct sockaddr arp_netmask; /* netmask (only for proxy arps) */
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};
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/* ARP Flag values. */
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#define ATF_COM 0x02 /* completed entry (ha valid) */
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#define ATF_PERM 0x04 /* permanent entry */
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#define ATF_PUBL 0x08 /* publish entry */
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#define ATF_USETRAILERS 0x10 /* has requested trailers */
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#define ATF_NETMASK 0x20 /* want to use a netmask (only
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for proxy entries) */
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#define ATF_DONTPUB 0x40 /* don't answer this addresses */
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/*
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* This structure defines an ethernet arp header.
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*/
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struct arphdr
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{
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__be16 ar_hrd; /* format of hardware address */
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__be16 ar_pro; /* format of protocol address */
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unsigned char ar_hln; /* length of hardware address */
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unsigned char ar_pln; /* length of protocol address */
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__be16 ar_op; /* ARP opcode (command) */
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#if 0
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/*
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* Ethernet looks like this : This bit is variable sized however...
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*/
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unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
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unsigned char ar_sip[4]; /* sender IP address */
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unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
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unsigned char ar_tip[4]; /* target IP address */
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#endif
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};
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#ifdef __KERNEL__
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#include <linux/skbuff.h>
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static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
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{
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return (struct arphdr *)skb_network_header(skb);
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}
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static inline int arp_hdr_len(struct net_device *dev)
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{
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/* ARP header, plus 2 device addresses, plus 2 IP addresses. */
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return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
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}
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#endif
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#endif /* _LINUX_IF_ARP_H */
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