mips_sys

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#ifndef IP_H
#define IP_H
#include "ethernet.h"
/// header of IP packet
struct ip_header
{
  unsigned char ver__hdr_len;
  unsigned char tos;
  unsigned short total_len;
  unsigned short id;
  unsigned short frag_ofs;
  unsigned char ttl;
  unsigned char proto;
  unsigned short hdr_chk;
  unsigned char src[4];
  unsigned char dest[4];
} __attribute__((packed));
/// IP packet
struct ip_packet
{
  struct ethernet_header eth_hdr;
  struct ip_header ip_hdr;
} __attribute__((packed));
/// initialize
void ip_init(void);
/// tick procedure - call every 200ms
void ip_tick200(void);
/**
 * @brief process a received IP packet
 * @param[in] ptr pointer to data of packet
 * @param[in] sz size of packet
 */
void ip_recv(void *ptr, unsigned int sz);
/**
 * @brief send an IP packet
 * @param[in] ptr pointer to data of packet
 * @param[in] sz size of packet
 *
 * ptr must point to a ip_packet
 * with ip_hdr.proto and ip_hdr.dest already initialized
 */
void ip_send(void *ptr, unsigned int sz);
/**
 
 
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