/* *  this file used by (at least) the kernel, arpd, snoopy, tboot */typedef struct Arppkt	Arppkt;typedef struct Arpentry	Arpentry;typedef struct Arpstats	Arpstats; /* Format of ethernet arp request */struct Arppkt {	uchar	d[6];	uchar	s[6];	uchar	type[2];	uchar	hrd[2];	uchar	pro[2];	uchar	hln;	uchar	pln;	uchar	op[2];	uchar	sha[6];	uchar	spa[4];	uchar	tha[6];	uchar	tpa[4];	}; #define ARPSIZE		42 /* Format of request from starp to user level arpd */struct Arpentry {	uchar	etaddr[6];	uchar	ipaddr[4];	}; /* Arp cache statistics */struct Arpstats {	int	hit;	int	miss;	int	failed;	}; #define ET_ARP		0x0806#define ET_RARP		0x8035 #define ARP_REQUEST	1#define ARP_REPLY	2#define RARP_REQUEST	3#define RARP_REPLY	4