mips_sys

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#include "arp.h"
#include "config.h"
#include "ethernet.h"
#include "ip.h"
#include "macros.h"
#include "nethelp.h"
// timing parameters
#define ARP_TICKS_MAX        (150) /**< maximum age of ARP table entries
                                        (in 200ms steps) */
#define ARP_NO_MAC_TICKS_MAX  (50) /**< maximum age of ARP table entries
                                        without MAC (in 200ms steps) */
#define ARP_RETRY_TICKS        (8) /**< time after which to retry ARP query
                                        (must be power of 2, in 200ms steps) */
/// ARP table
#define ARP_TAB_FLAG_IN_USE (1)
#define ARP_TAB_FLAG_MAC_OK (2)
struct arp_table
{
  unsigned int flags; /// flags - see constants
  unsigned int ticks; /// age of entry in 200ms steps
  unsigned char mac[6];
  unsigned char ip[4];
} arp_tab[16];
/**
 * @brief send an ARP request
 * @param[in] ip IP address to query MAC for
 */
static void arp_send_request(unsigned char ip[4])
{
  struct arp_packet arp_request;
  // build ARP request
  arp_request.arp_hdr.hw_type = htons(0x0001); // ethernet
  arp_request.arp_hdr.proto_type = htons(0x0800); // IP
  arp_request.arp_hdr.hw_len = 0x06; // length of a MAC address
  arp_request.arp_hdr.proto_len = 0x04; // length of an IP address
  arp_request.arp_hdr.op = htons(0x0001); // ARP request
  mac_cpy(arp_request.arp_hdr.src_mac, config_mac.mac); // own MAC
  ip_cpy(arp_request.arp_hdr.src_ip, config_ip.ip); // own IP
  mac_cpy(arp_request.arp_hdr.dest_mac,
          "\xFF\xFF\xFF\xFF\xFF\xFF"); // broadcast MAC
  ip_cpy(arp_request.arp_hdr.dest_ip, ip); // requested IP
  // send ARP request
  mac_cpy(arp_request.eth_hdr.dest, arp_request.arp_hdr.dest_mac);
  arp_request.eth_hdr.type = htons(0x0806); // ethernet packet type: ARP
  ethernet_send(&arp_request, sizeof(arp_request));
}
 
 
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