netdev - Re: Passive OS fingerprinting.

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Date:	Tue, 01 Jul 2008 16:16:28 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
CC:	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: Passive OS fingerprinting.

Evgeniy Polyakov wrote:
> On Tue, Jul 01, 2008 at 03:41:58PM +0200, Patrick McHardy (kaber@...sh.net) wrote:
>   
>>> I am also not sure OSF should live in kernel, but what it does it does
>>> good and there is no simple way to do the same with existing
>>> functionality. It is possible, but not simple, and definitely not
>>> trivial for administrator :)
>>>       
>> I don't like the current way such things are implemented in iptables
>> (have all logic in the kernel instead of just providing a mechanism
>> for implementing it in userspace and presenting a nice view to the
>> administrator). Thats not your fault of course and your module is
>> also not the first one to do this.
>>     
>
> I bet it is not the last one :)
>   

I truely hope it will be since I'm working (slowly, as time permits)
on the *tables successor that will implement things like this in
userspace. Every module we add that adds more complicated logic in
the kernel will make adding an iptables compat layer harder.

>> Unfortunately its most likely not possible to convince me to like
>> this, so lets just say that I'm fine with merging it if someone
>> speaks up in favour of it :)
>>     
>
> Cool. If no none will reply, nothing actually changes :)
> OSF lived on its own all the time except several months in patch-o-matic
> and then its next generation.
>
>   

I'd CC the netfilter user list, its likely you'll find some voices
in favour there :)

>>> There was no nfnetlink either 5 years ago, when OSF was created,
>>> this release is just subsequent update to the project.
>>> At some moment OSF shared netlink group with ulog, but it was
>>> considered harmful, so I dropped support. Netlink usage is
>>> rather trivial: it just sends information about matched packt to
>>> userspace, so it can block it on its own, rise a message in the window
>>> or perform some other steps. Nothing exceptionally complex :)
>>>  
>>>       
>> Yes, but I don't want to add another interface netfilter userspace
>> has to know about. It should either use nfnetlink and remove the proc
>> interface, or remove the connector interface and use proc.
>> Preferrably the former.
>>     
>
> It uses proc to load rules - I do not like it either, but it was the
> simplest way to do so :)

We can rethink that part if it will actually get merged.

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