Re: First hints for developing

Op di, 15-02-2005 te 18:24 +0100, schreef George:
> Hi all.
> 
> I'm interested on developing a modules to do some stuff at MAC layer and I 
> think the best option is ebtables. I've been reading and there seems to be 
> quite similar to Netfilter modules, but I still have some doubts.
> 
> I have seen that there are some hooks NF_BR_XXX_YYYY. In netfilter there 
> are the same. What I want to achieve is to develop a module that once it 
> traverse a hook, the register function is executed.
> In netfilter is done like :
> 
> struct nf_hook_ops hook_ex;
> 
>    hook_ex.list.next = NULL;
>    hook_ex.list.prev = NULL;
>    hook_ex.hook = function_hook;
>    hook_ex.pf = PF_INET;
>    hook_ex.hooknum = NF_IP_LOCAL_OUT;
> 
>    return nf_register_hook(&hook_ex);
> 
> 
> How is the same achieved in ebtables? is something with struct ebt_match? 
> Could you give me a simple example code that just printk some message when 
> a packet traverse the NF_BR_PRE_ROUTING for example

See ebt_log.c in the kernel (net/bridge/netfilter/ebt_log.c) and
userspace code (extensions/ebt_log.c).

If you make something like an ebt_log module, you can use ebtables rules
that let your module see the packet.


cheers,
Bart




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