lifr_addr
sa = &ifr->lifr_addr;
if (is_loopback_address((struct sockaddr *)&lifr->lifr_addr)) {
if (lifr2->lifr_addr.ss_family == lifr->lifr_addr.ss_family
&& !memcmp (&lifr2->lifr_addr, &lifr->lifr_addr,
if ((*pass1fn) (data, ss2sa (&lifr->lifr_addr)))
if ((*pass2fn) (data, ss2sa (&lifr->lifr_addr)))