bsd_to_linux_domain
bdom = bsd_to_linux_domain(sa->sa_family);
sa_family_t bsd_to_linux_domain(sa_family_t domain);
bsd_to_linux_domain(bifr.ifr_addr.sa_family);
ifinfo->ifi_family = bsd_to_linux_domain(ifinfo->ifi_family);
ifamsg->ifa_family = bsd_to_linux_domain(ifamsg->ifa_family);
ndm->ndm_family = bsd_to_linux_domain(ndm->ndm_family);
rtm->rtm_family = bsd_to_linux_domain(rtm->rtm_family);
newval = bsd_to_linux_domain((sa_family_t)newval);