/*	Copyright 2001, 2002 Georges Menie (www.menie.org)	This file is part of Tftpnaive.    Tftpnaive is free software; you can redistribute it and/or modify    it under the terms of the GNU Lesser General Public License as published by    the Free Software Foundation; either version 2 of the License, or    (at your option) any later version.    Tftpnaive is distributed in the hope that it will be useful,    but WITHOUT ANY WARRANTY; without even the implied warranty of    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    GNU Lesser General Public License for more details.    You should have received a copy of the GNU Lesser General Public License    along with Tftpnaive; if not, write to the Free Software    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA*/#include "tftpnaive.h"#include "net.h"#include "timer.h"void processIP (unsigned char *pkt, unsigned short len){	register IPpkt *p = (IPpkt *) pkt;	if (len >= sizeof (IPpkt)) {		if ((p->vlt & 0xff00) == IPV4) {			if ((p->frag & ~DONT_FRAGMENT_MASK) == 0) {				if (netif.ip == 0 || p->dst_ip == netif.ip) {					if (cks (&p->vlt, sizeof (IPpkt) - sizeof (EthHeader)) == 0) {						if (p->prot == PROTO_ICMP) {							processICMP (pkt, len);						}						else if (p->prot == PROTO_UDP) {							processUDP (pkt, len);						}					}				}			}		}	}}int sendIP (IPpkt * p, unsigned short len, unsigned char prot,			unsigned int dst_ip){	register unsigned char *dst;	register int trycount;	p->vlt = IPV4;	p->length = len + sizeof (IPpkt) - sizeof (EthHeader);	p->id = 0;	p->frag = 0;	p->ttl = 3;	p->prot = prot;	p->src_ip = netif.ip;	p->dst_ip = dst_ip;	p->cks = 0;	p->cks = cks (&p->vlt, sizeof (IPpkt) - sizeof (EthHeader));	if (dst_ip == -1) {		memset (p->ehdr.dst_hwadr, 0xff, 6);	}	else {		for (trycount = 3; trycount; --trycount) {			dst = lookupARP (p->dst_ip);			if (dst) {				memcpy (p->ehdr.dst_hwadr, dst, 6);				break;			}			sendARPRequest (netif.ip, p->dst_ip);			busyWait (100, processPacket, 0);		}		dst = lookupARP (p->dst_ip);		if (dst) {			memcpy (p->ehdr.dst_hwadr, dst, 6);		}		else			return -1;	}	memcpy (p->ehdr.src_hwadr, netif.IEEEIA, 6);	p->ehdr.frametype = FRAME_IP;	return netif.send (p, len + sizeof (IPpkt));}