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