fr_matchtag
if (fr_matchtag(&fr->fr_nattag, fin->fin_nattag) == 0)
!fr_matchtag(&np->in_tag, &fr->fr_nattag))
!fr_matchtag(&np->in_tag, &fr->fr_nattag))
if (fr_matchtag(&fr->fr_nattag, fin->fin_nattag) != 0) {
extern int fr_matchtag __P((ipftag_t *, ipftag_t *));