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arp.h

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/*!     \file include/net/arp.h
 *      \brief ARP (Address Resolution Protocol) layer header.
 *      \author Andrea Righi <drizzt@inwind.it>
 *      \date Last update: 2003-11-09
 *      \note Copyright (&copy;) 2003 Andrea Righi
 */

#ifndef ARP_H
#define ARP_H

#include <net/ip.h>

//! Ethernet hardware addresses.
#define ARPHRD_ETHER            1

/** \ingroup Network
 *  \defgroup NetARP ARP (Address Resolution Protocol) layer
 *  The ARP (Address Resolution Protocol) layer.
 *  @{
 */

//! ARP request operation.
#define ARP_OP_REQUEST          1
//! ARP reply operation.
#define ARP_OP_REPLY            2
//! RARP request operation.
#define RARP_OP_REQUEST         3
//! RARP reply operation.
#define RARP_OP_REPLY           4

// The ARP packet structure.
typedef struct arp
{
        //! Format of hardware address.
        uint16_t arp_hard_type;
        //! Format of protocol address.
        uint16_t arp_proto_type;
        //! Length of hardware address.
        uint8_t  arp_hard_size;
        //! Length of protocol address.
        uint8_t  arp_proto_size;
        //! ARP operation code (command).
        uint16_t arp_op;
        //! Hardware source address.
        uint8_t  arp_eth_source[6];
        //! IP source address.
        uint32_t arp_ip_source;
        //! Hardware destination address.
        uint8_t  arp_eth_dest[6];
        //! IP destination address.
        uint32_t arp_ip_dest;
} __attribute__ ((packed)) arp_t;

// --- Prototypes ----------------------------------------------------- //

void to_arp_layer(arp_t *packet);
void arp_reset_cache();
void arp_add_cache(in_addr_t ip, uint8_t *mac);
bool arp_remove_cache(in_addr_t ip);
bool arp_ip_to_eth(uint8_t *eth_addr, in_addr_t ip_addr);
int arp_ip_to_eth(uint8_t *eth_addr, uint32_t ip_addr);
int send_arp_packet(in_addr_t ip_to, const uint8_t *eth_to, uint16_t arp_op);
void arp_request(char *ip_dot);

/** @} */ // end of NetARP

#endif

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