#ifndef _UDP_H_#define _UDP_H_#include <stdint.h>#include "mynic.h"#include "ip.h"#define UDP_POS_DEST_PORT (IP_POS_DATA + 2)#define UDP_POS_DATA (IP_POS_DATA+8)void udp_generate_packet(unsigned char *buffer,                         uint32_t *dest_ip,                          unsigned char *dest_mac, unsigned int source_port,                          unsigned int dest_port, unsigned int data_length);#endif