ngm_macfilter_macs
const struct ngm_macfilter_macs *const ngm_macs =
(const struct ngm_macfilter_macs *)(buf - OFFSETOF(struct ngm_macfilter_macs, macs));
struct ngm_macfilter_macs *ngm_macs;
resplen = sizeof(struct ngm_macfilter_macs) + n * sizeof(struct ngm_macfilter_mac);
ngm_macs = (struct ngm_macfilter_macs *)resp->data;