fw/arp.h (3b2902e) - mips_sys · BlinkenArea

arp.h

#ifndef ARP_H
#define ARP_H

#include "ethernet.h"

/// header of ARP packet
struct arp_header
{
  unsigned short hw_type;
  unsigned short proto_type;
  unsigned char hw_len;
  unsigned char proto_len;
  unsigned short op;
  unsigned char src_mac[6];
  unsigned char src_ip[4];
  unsigned char dest_mac[6];
  unsigned char dest_ip[4];
} __attribute__((packed));

/// ARP packet
struct arp_packet
{
  struct ethernet_header eth_hdr;
  struct arp_header arp_hdr;
} __attribute__((packed));

/// initialize
void arp_init(void);

/// tick procedure - call every 200ms
void arp_tick200(void);

/**
 * @brief process a received ARP packet
 * @param[in] ptr pointer to data of packet
 * @param[in] sz size of packet
 */
void arp_recv(void *ptr, unsigned int sz);

/**
 * @brief look up the MAC for an IP address
 * @param[in] ip IP address to look up
 * @param[out] mac MAC address for this IP address
 * @return 0 in case of success, 1 if the MAC address is unknown
 */
int arp_lookup(unsigned char ip[4], unsigned char mac[6]);

/**
 * @brief store the MAC for an IP address
 * @param[in] ip IP address to store MAC for
 * @param[out] mac MAC address for this IP address
 */
void arp_store(unsigned char ip[4], unsigned char mac[6]);

#endif // #ifdef ARP_H

mips_sys

use implicit MAC/IP information in received IP packets