question: hook/unhook

[Mikkel Christiansen <mixxel@cs.auc.dk>]

Hi

We're working with an efficient packet filter
(see http://www.cs.auc.dk/~mixxel/cf). 

In the implementation we would like to block
all arriving packets while moving from one filter
to another. I.e. something like:

block_all_packets();
nf_unregister_hook(some_nf_hook_ops_struct);
nf_register_hook(some_other_nf_hook_ops_struct);
unblock_all_packets();

Does netfilter provide functions for doing this or can anyone
recommend a proper way to do this?

Cheers & thanks
    Mikkel