What IPF does (external/bsd/ipf/netinet/ip_fil_netbsd.c) is:
# if __NetBSD_Version__ >= 499001100
error = ip6_if_output(ifp, ifp, m0, satocsin6(dst), rt);
# else
error = nd6_output(ifp, ifp, m0, dst6, rt);
# endif
I also stumbled across a comment in netinet6/nd6.c which needs to be adjusted:
/*
* XXX: since nd6_output() below will cause
* state tansition to DELAY and reset the timer,
* we must set the timer now, although it is actually
* meaningless.
*/
> Did you research why nd6_output has been removed?
FWIW, that was netinet6/nd6.c 1.227.
