Re: netfilter language

[Patrick Schaaf <bof@bof.de>]

>     I was wondering, can C++ be used in developing
> netfilter modules, or is it really limited more to C? 

ANY kernel development is limited to C - Gnu gcc, to be exact.

> Also, are there any references to the order
> in which my work would be called?

See the definition of 'enum nf_ip_hook_priorities' in the file
include/linux/netfilter_ipv4.h. These go into the 'priority' field
of the 'struct nf_hook_ops' (declaration in include/linux/netfilter.h).

You define such a 'struct nf_hook_ops', and pass it to nf_register_hook(),
in your module initialization code.

> Because of it's nature, I would need to be called before any other
> handler module (especially conn track).

Just use a priority numerically lower than -200 (NF_IP_PRI_CONNTRACK).

best regards
  Patrick