#include "skbuff.h"#include "eth.h"#include "arp.h" #include "ip.h"#include "udp.h"#include "tftp.h"extern int tftp_put_ok;extern unsigned long tftp_buff_addr;int net_handle(void){	struct sk_buff *skb;	struct ethhdr *eth_hdr;	skb = alloc_skb(ETH_FRAME_LEN);	if (eth_rcv(skb) != -1) {		eth_hdr = (struct ethhdr *)(skb->data);		skb_pull(skb, ETH_HLEN);		if (ntohs(eth_hdr->h_proto) == ETH_P_ARP)			arp_rcv_packet(skb);		else if(ntohs(eth_hdr->h_proto) == ETH_P_IP)		 	ip_rcv_packet(skb);	}	free_skb(skb);	return 0;}int timeout_handle(void){	static int timeout = 0;	timeout++;	if (timeout < 5000) return 0;	timeout = 0;	return 0;}int tftp_main(unsigned long ip, unsigned long addr){	unsigned char eth_addr[ETH_ALEN];	unsigned char *s = (unsigned char *)&ip;	int timeout = 0;	tftp_printf("\nMini TFTP Server 1.0 (IP : %d.%d.%d.%d)\r", s[3], s[2], s[1], s[0]);	tftp_printf("\nCommand: tftp -i %d.%d.%d.%d put image.bin\r",s[3],s[2],s[1],s[0]);	tftp_buff_addr = addr;	eth_init();	eth_get_addr(eth_addr);	arp_init();	ip_init(ip);	udp_init();	arp_add_entry(eth_addr, ip);	tftp_put_ok =0;	while (1)     {	     net_handle();	     timeout_handle();	     if (tftp_put_ok || getkey()) break;	}		return 0;}