Problem regarding Source node track code

[arun kumarn]

Hi
I understand what actually source node track option is for, and
i understood pf_insert_src_node( ) function.

please let me know what for the following pf_threshold structure ???

struct pf_threshold {
        u_int32_t       limit;
#define PF_THRESHOLD_MULT       1000
#define PF_THRESHOLD_MAX        0xffffffff / PF_THRESHOLD_MULT
        u_int32_t       seconds;
        u_int32_t       count;
        u_int32_t       last;
};

and what the following functions do

pf_init_threshold( )

pf_add_threshold( )

pf_check_threshold( )

pf_src_connlimit( )

I am analyzing the above said functions, but i can't able to get their
functionality properly.

please clarify me

Thanks and Regards
Arun