LOOPBACK_IFINDEX   44 src/core/loopback-setup.c         r = sd_rtnl_message_new_link(rtnl, &req, RTM_SETLINK, LOOPBACK_IFINDEX);
LOOPBACK_IFINDEX  160 src/resolve/resolved-dns-stream.c         if (s->ifindex == LOOPBACK_IFINDEX)
LOOPBACK_IFINDEX  963 src/resolve/resolved-manager.c         if (p->ifindex == LOOPBACK_IFINDEX)
LOOPBACK_IFINDEX  595 src/shared/missing.h #ifndef LOOPBACK_IFINDEX