arp.h

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#define ARP_HALEN 6
#define ARP_PALEN 4
#define ARP_HTYPE 1
#define ARP_PTYPE 0x0800
#define ARP_OP_REQ 1
#define ARP_OP_RPLY 2
#define ARP_SIZ 16
#define ARP_RETRY 3
#define ARP_TIMEOUT 300 /* Retry timer in milliseconds  */

#define AR_FREE 0
#define AR_PENDING 1
#define AR_RESOLVED 2

#pragma pack(2)

struct arppacket
{
    byte arp_ethdst[ETH_ADDR_LEN];
    byte arp_ethsrc[ETH_ADDR_LEN];
    uint16 arp_ethtype;
    uint16 arp_htype;
    uint16 arp_ptype;
    byte arp_hlen;
    byte arp_plen;
    uint16 arp_op;
    byte arp_sndha[ARP_HALEN];
    uint32 arp_sndpa;
    byte arp_tarha[ARP_HALEN];
    uint32 arp_tarpa;
};
#pragma pack()

struct arpentry
{
    int32 arstate;
    uint32 arpaddr;
    pid32 arpid;
    byte arhaddr[ARP_HALEN];
};

extern struct arpentry arpcache[];