ifr_dstaddr
target = (struct sockaddr_in *)&ifr->ifr_dstaddr;
sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
error = in_sa2sin(&ifr->ifr_dstaddr, &sin);
*satosin(&ifr->ifr_dstaddr) = ia->ia_broadaddr;
*satosin(&ifr->ifr_dstaddr) = ia->ia_dstaddr;
ifr->ifr_dstaddr = ia6->ia_dstaddr;
ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;