#ifndef __ARP_H#define __ARP_H#include "eth.h"/* ARP protocol HARDWARE identifiers. */#define ARPHRD_NETROM	0		/* from KA9Q: NET/ROM pseudo	*/#define ARPHRD_ETHER 	1		/* Ethernet 10Mbps		*/#define	ARPHRD_EETHER	2		/* Experimental Ethernet	*/#define	ARPHRD_AX25	3		/* AX.25 Level 2		*/#define	ARPHRD_PRONET	4		/* PROnet token ring		*/#define	ARPHRD_CHAOS	5		/* Chaosnet			*/#define	ARPHRD_IEEE802	6		/* IEEE 802.2 Ethernet/TR/TB	*/#define	ARPHRD_ARCNET	7		/* ARCnet			*/#define	ARPHRD_APPLETLK	8		/* APPLEtalk			*/#define ARPHRD_DLCI	15		/* Frame Relay DLCI		*/#define ARPHRD_ATM	19		/* ATM 				*/#define ARPHRD_METRICOM	23		/* Metricom STRIP (new IANA id)	*/#define	ARPHRD_IEEE1394	24		/* IEEE 1394 IPv4 - RFC 2734	*/#define ARPHRD_EUI64	27		/* EUI-64                       *//* Dummy types for non ARP hardware */#define ARPHRD_SLIP	256#define ARPHRD_CSLIP	257#define ARPHRD_SLIP6	258#define ARPHRD_CSLIP6	259#define ARPHRD_RSRVD	260		/* Notional KISS type 		*/#define ARPHRD_ADAPT	264#define ARPHRD_ROSE	270#define ARPHRD_X25	271		/* CCITT X.25			*/#define ARPHRD_HWX25	272		/* Boards with X.25 in firmware	*/#define ARPHRD_PPP	512#define ARPHRD_CISCO	513		/* Cisco HDLC	 		*/#define ARPHRD_HDLC	ARPHRD_CISCO#define ARPHRD_LAPB	516		/* LAPB				*/#define ARPHRD_DDCMP    517		/* Digital's DDCMP protocol     */#define ARPHRD_RAWHDLC	518		/* Raw HDLC			*/#define ARPHRD_TUNNEL	768		/* IPIP tunnel			*/#define ARPHRD_TUNNEL6	769		/* IPIP6 tunnel			*/#define ARPHRD_FRAD	770             /* Frame Relay Access Device    */#define ARPHRD_SKIP	771		/* SKIP vif			*/#define ARPHRD_LOOPBACK	772		/* Loopback device		*/#define ARPHRD_LOCALTLK 773		/* Localtalk device		*/#define ARPHRD_FDDI	774		/* Fiber Distributed Data Interface */#define ARPHRD_BIF      775             /* AP1000 BIF                   */#define ARPHRD_SIT	776		/* sit0 device - IPv6-in-IPv4	*/#define ARPHRD_IPDDP	777		/* IP over DDP tunneller	*/#define ARPHRD_IPGRE	778		/* GRE over IP			*/#define ARPHRD_PIMREG	779		/* PIMSM register interface	*/#define ARPHRD_HIPPI	780		/* High Performance Parallel Interface */#define ARPHRD_ASH	781		/* Nexus 64Mbps Ash		*/#define ARPHRD_ECONET	782		/* Acorn Econet			*/#define ARPHRD_IRDA 	783		/* Linux-IrDA			*//* ARP works differently on different FC media .. so  */#define ARPHRD_FCPP	784		/* Point to point fibrechannel	*/#define ARPHRD_FCAL	785		/* Fibrechannel arbitrated loop */#define ARPHRD_FCPL	786		/* Fibrechannel public loop	*/#define ARPHRD_FCFABRIC	787		/* Fibrechannel fabric		*/	/* 787->799 reserved for fibrechannel media types */#define ARPHRD_IEEE802_TR 800		/* Magic type ident for TR	*/#define ARPHRD_IEEE80211 801		/* IEEE 802.11			*/#define ARPHRD_VOID	  0xFFFF	/* Void type, nothing is known *//* ARP protocol opcodes. */#define	ARPOP_REQUEST	1		/* ARP request			*/#define	ARPOP_REPLY	2		/* ARP reply			*/#define	ARPOP_RREQUEST	3		/* RARP request			*/#define	ARPOP_RREPLY	4		/* RARP reply			*/#define	ARPOP_InREQUEST	8		/* InARP request		*/#define	ARPOP_InREPLY	9		/* InARP reply			*/#define	ARPOP_NAK	10		/* (ATM)ARP NAK			*//* *	This structure defines an ethernet arp header. */struct arphdr{	unsigned short	ar_hrd;		/* format of hardware address	*/	unsigned short	ar_pro;		/* format of protocol address	*/	unsigned char	ar_hln;		/* length of hardware address	*/	unsigned char	ar_pln;		/* length of protocol address	*/	unsigned short	ar_op;		/* ARP opcode (command)		*/	 /*	  *	 Ethernet looks like this : This bit is variable sized however...	  */	unsigned char	ar_sha[ETH_ALEN];	/* sender hardware address	*/	unsigned long	ar_sip;			/* sender IP address		*/	unsigned char	ar_tha[ETH_ALEN];	/* target hardware address	*/	unsigned long	ar_tip;			/* target IP address		*/}__attribute__ ((packed));int arp_init(void);int arp_add_entry(unsigned char *ha, unsigned long ip);int arp_get_eth_addr(unsigned long ip, unsigned char *ha);int arp_rcv_packet(struct sk_buff *skb);#endif /* __ARP_H */