arp.h

Hermit-at-1.1.3,一款bootloader

#ifndef _HERMIT_ARP_H_
#define _HERMIT_ARP_H_

#define ARP_CACHE_SURVIVAL_TIME 20 //[minute]

typedef struct _arp_cache_table{
  unsigned char mac[6];
  unsigned char ipaddr[4];
}arp_cache_table;

typedef enum _arp_htype_id{
  ARP_HTYPE_ETH    = 0x0001,//Ethernet
  ARP_HTYPE_TOKENR = 0x0004,//TokenRing
  ARP_HTYPE_ATM    = 0x0010,//ATM
}arp_htype_id;

typedef enum _arp_ptype_id{
  ARP_PTYPE_IP = 0x0800,
}arp_ptype_id;

#define ARP_HLEN_ETH  0x06
#define ARP_PLEN_IPV4 0x04

typedef enum _arp_opecode{
  ARP_OP_REQ       = 0x0001,
  ARP_OP_REPLY     = 0x0002,
  ARP_OP_RARPREQ   = 0x0003,//Reverse ARP Request
  ARP_OP_RARPREPLY = 0x0004,//Reverse ARP Reply
}arp_opcode;

typedef struct _arp_frame{
  unsigned short htype;//hardware type
  unsigned short ptype;//protocol type
  unsigned char hlen;//hardware address length
  unsigned char plen;//protocol address length
  unsigned short opecode;//operation code
  unsigned char host_mac[6];
  unsigned char host_ipaddr[4];
  unsigned char target_mac[6];
  unsigned char target_ipaddr[4];
}arp_frame;

int arp_search(unsigned char *target_mac, const unsigned char *target_ipaddr);

int arp_proc(const unsigned char *packet, const int plen);
#endif