MRT_BASE
return opt >= MRT_BASE && opt <= MRT_MAX;
#define MRT_INIT (MRT_BASE) /* Activate the kernel mroute code */
#define MRT_DONE (MRT_BASE+1) /* Shutdown the kernel mroute */
#define MRT_ADD_VIF (MRT_BASE+2) /* Add a virtual interface */
#define MRT_DEL_VIF (MRT_BASE+3) /* Delete a virtual interface */
#define MRT_ADD_MFC (MRT_BASE+4) /* Add a multicast forwarding entry */
#define MRT_DEL_MFC (MRT_BASE+5) /* Delete a multicast forwarding entry */
#define MRT_VERSION (MRT_BASE+6) /* Get the kernel multicast version */
#define MRT_ASSERT (MRT_BASE+7) /* Activate PIM assert mode */
#define MRT_PIM (MRT_BASE+8) /* enable PIM code */
#define MRT_TABLE (MRT_BASE+9) /* Specify mroute table ID */
#define MRT_ADD_MFC_PROXY (MRT_BASE+10) /* Add a (*,*|G) mfc entry */
#define MRT_DEL_MFC_PROXY (MRT_BASE+11) /* Del a (*,*|G) mfc entry */
#define MRT_FLUSH (MRT_BASE+12) /* Flush all mfc entries and/or vifs */
#define MRT_MAX (MRT_BASE+12)