LARTC - Nov 1999 - help: can some body tell me the how to fill params of u32 filter in kernel ?

i'm a chinese programmer, i want to write a system call to create an filter
attach with some

qdisc, but i don't know the filter param's struct in the kernel.

i just know the struct

struct tc_u32_key
{
 __u32  mask;
 __u32  val;
 int  off;
 int  offmask;
};

struct tc_u32_sel
{
 unsigned char  flags;
 unsigned char  offshift;
 unsigned char  nkeys;

 __u16   offmask;
 __u16   off;
 short   offoff;

 short   hoff;
 __u32   hmask;

 struct tc_u32_key keys[0];
};

but i don't know how to fill it ,

the struct's mean?

can you tell me 

               zxl zxlchinese@china.com