mips_sys

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#include "checksum.h"
#include "ethernet.h"
#include "icmp.h"
#include "ip.h"
#include "macros.h"
#include "nethelp.h"
/**
 * @brief send an ICMP packet
 * @param[in] ptr pointer to data of packet
 * @param[in] sz size of packet
 *
 * ptr must point to a icmp_packet
 * with icmp_hdr.type, icmp_hdr.code and ip_hdr.sest already initialized
 */
static void icmp_send(void *ptr, unsigned int sz)
{
  struct icmp_packet *icmp_pack;
  unsigned short chk;
  // packet too short
  if (sz < sizeof(struct icmp_packet))
    return;
  icmp_pack = ptr;
  // fill in header values
  icmp_pack->icmp_hdr.chk = 0x0000;
  // generate checksum
  chk = checksum(&icmp_pack->icmp_hdr,
                 sz - sizeof(struct ethernet_header)
                    - sizeof(struct ip_header),
                 0x0000, 0x0000);
  icmp_pack->icmp_hdr.chk = htons(chk);
  // send ICMP packet
  icmp_pack->ip_hdr.proto = 0x01; // ICMP
  ip_send(icmp_pack, sz);
}
/**
 * @brief process a received ICMP echo request packet
 * @param[in] ptr pointer to data of packet
 * @param[in] sz size of packet
 */
static void icmp_echo_req_recv(void *ptr, unsigned int sz)
{
  struct icmp_echo_packet *icmp_echo_pack;
  // packet too short
 
 
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