ip6_copypktopts
new_inp->ip_inp.inp.in6p_outputopts = ip6_copypktopts(old_inp->ip_inp.inp.in6p_outputopts, M_NOWAIT);
ip6_copypktopts(oinp->in6p_outputopts, M_NOWAIT);
struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);