NPFVAR_INTERFACE
return npfvar_create_element(NPFVAR_INTERFACE, &ifna, sizeof(ifna));
ifna = npfvar_get_data($1, NPFVAR_INTERFACE, 0);
ifnet_addr_t *ifna = npfvar_get_data($1, NPFVAR_INTERFACE, 0);
case NPFVAR_INTERFACE:
case NPFVAR_INTERFACE:
[NPFVAR_INTERFACE] = "interface-address",