rem: int loopback_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
add: static int loopback_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
context: int loopback_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,			struct rtentry *rt){	/* turn it straight back... */	/* This is lame as we should be detecting the protocol, but it gets	 * us working.	 * XXX - fix me!	 */	struct ip *ip = mtod(m, struct ip *);	ip->ip_dst = ip->ip_src;	ip->ip_src.s_addr = INADDR_LOOPBACK;	IFQ_ENQUEUE(ifp->rxq, m);	return 0;}