ip6_setpktopts
if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ?
int ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
error = ip6_setpktopts(control, &opt, inp->in6p_outputopts,
if ((error = ip6_setpktopts(control, &opt,