srt_find_ds
struct ds_nbr *srt_find_ds(struct rt_node *, u_int32_t);
if (srt_find_ds(rn, p->nexthop.s_addr) == NULL) {
if ((ds_nbr = srt_find_ds(rn, nbr_report)))
if ((ds_nbr = srt_find_ds(rn, nbr_report)))
if (srt_find_ds(rn, nbr_report) == NULL)
ds = srt_find_ds(rn, addr.s_addr);