nhop_set_blackhole
void nhop_set_blackhole(struct nhop_object *nh, int blackhole_rt_flag);
nhop_set_blackhole(nh, info->rti_flags & (RTF_BLACKHOLE | RTF_REJECT));
nhop_set_blackhole(nh, NHF_BLACKHOLE);
nhop_set_blackhole(nh, RTF_BLACKHOLE);
nhop_set_blackhole(nh, RTF_REJECT);