cfpkt_append
struct cfpkt *cfpkt_append(struct cfpkt *dstpkt, struct cfpkt *addpkt,
tmppkt = cfpkt_append(rfml->incomplete_frm, pkt,
pkt = cfpkt_append(pkt, tail_pkt, 0);
cfpkt_append(layr->incomplete_frm, newpkt, expectlen);