arp.h

实用的程序代码

/*
 * ARP : Header File
 */

#ifndef _ARP_H
#define _ARP_H

#include <net/eth.h>

/* ARP hardware types */

#define ARP_HARD_TYPE_ETH    0x01  /* ethernet hardware address */
#define ARP_HARD_SIZE        0x06  /* ethernet address size  */
#define ARP_PROTO_IP_SIZE    0x04  /* ip address size */
#define ARP_PAD_SIZE         18    /* no.of bytes to be padded in arp pkt */ 


/* ARP operation codes */
#define	ARP_REQ 	1	 /* ARP request	*/
#define	ARP_REPLY	2	 /* ARP reply	*/

#define ARP_SIP_OFFSET    14
#define ARP_DIP_OFFSET    24

/*
 *	This structure defines an ethernet arp header.
 */

struct xilnet_arp_hdr
{
  unsigned short hard_type;   /* type of hardware address */
  unsigned short prot_type;   /* type of protocol address */	
  unsigned char	hard_size;    /* hardware address size */
  unsigned char	prot_size;    /* protocol address size */	
  unsigned short op;	      /* arp opcode */
};

struct xilnet_arp_pkt
{
  struct xilnet_arp_hdr  hdr;           /* arp header */
  unsigned char	sender_hw[ETH_ADDR_LEN];     /* sender hardware address	*/
  unsigned char	sender_ip[4];	         /* sender IP address		*/
  unsigned char	target_hw[ETH_ADDR_LEN];     /* target hardware address	*/
  unsigned char	target_ip[4];	         /* target IP address		*/
  unsigned char pad[18];                 /* pad with 0 for min eth frame requirement */
};




#endif	/* _ARP_H */