SIN
sin = SIN(sockaddr);
m = SIN(&mask);
SIN(&lifr.lifr_addr));
IN6_INADDR_TO_V4MAPPED(&SIN(&lifr.lifr_addr)->sin_addr,
sin = SIN(&ipaddr->ipadm_static_addr);
addr = (SIN(&lifr.lifr_addr))->sin_addr.s_addr;
maddr = (SIN(&mask))->sin_addr.s_addr;
sin = SIN(&lifr.lifr_addr);
sin = SIN(addr);
sin = SIN(ss);