Here are the data structures with brief descriptions:

Clr_buffers_t	Click buffers object definition
Clr_cfg_t	Click configuration structure definition
Clr_mac_t	Mac object definition
Clr_procces_flags_t	Process Flags object definition
Clr_response_t	Response object definition
Clr_t	Click ctx object definition
Clr_timer_t	Timer Flags and Counter object definition