ifr_addr
sa = (struct sockaddr_at *)&atreq.ifr_addr;
struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
(*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
(*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
(struct sockaddr_ieee802154 *)&ifr->ifr_addr;
sq = (struct sockaddr_qrtr *)&ifr.ifr_addr;
((struct sockaddr_in *)&device.ifr_addr)->sin_addr.s_addr;