register an hook

[Nicola Padovano <nicola.padovano@gmail.com>]

hi all.
i've read how to register an hook in netfilter. and i found two ways.

the first uses, this routines:


 unsigned int my_hook(unsigned int hooknum,
                      struct sk_buff *skb,
                      const struct net_device *in,
                      const struct net_device *out,
                      int (*okfn)(struct sk_buff *))
 {
 }

int nf_register_hook(struct nf_hook_ops *reg)
int nf_unregister_hook(struct nf_hook_ops *reg)

the second instead:

static unsigned int xt_tarpit_target(struct sk_buff *skb,
				     const struct xt_target_param *par)

and:
xt_register_target(&xt_tarpit_reg);
xt_unregister_target(&xt_tarpit_reg);


which is the difference?

thank you!