ifr_dstaddr
target = (struct sockaddr_in *)&ifr->ifr_dstaddr;
*((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
*((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
ifr->ifr_dstaddr = ia->ia_dstaddr;
ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;