netdev - Re: [RFC 2/4] net: netfilter conntrack - add per-net functionality for DCCP protocol

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Date:	Tue, 10 Mar 2009 13:59:56 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Daniel Lezcano <daniel.lezcano@...e.fr>
Cc:	davem@...emloft.net, kaber@...sh.net, netdev@...r.kernel.org,
	linux-next@...r.kernel.org, xemul@...nvz.org, adobriyan@...il.com,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [RFC 2/4] net: netfilter conntrack - add per-net functionality 
	for DCCP protocol

On Tue, Mar 10, 2009 at 1:33 PM, Daniel Lezcano <daniel.lezcano@...e.fr> wrote:
> Daniel Lezcano wrote:
>>
>> Cyrill Gorcunov wrote:
>>>
>>> Module specific data moved into per-net site and being allocated/freed
>>> during net namespace creation/deletion.
>>>
>>> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
>>> ---
>>>  net/netfilter/nf_conntrack_proto_dccp.c |  148
>>> ++++++++++++++++++++++++--------
>>>  1 file changed, 111 insertions(+), 37 deletions(-)
>>>
>>>
>>>   static int __init nf_conntrack_proto_dccp_init(void)
>>>  {
>>>     int err;
>>>  -    err = nf_conntrack_l4proto_register(&dccp_proto4);
>>> +    err = register_pernet_gen_device(&dccp_net_id, &dccp_net_ops);
>>>
>
> [ cut ]
>>
>> Shouldn't it be register_pernet_gen_subsys ?

No, I believe. By using  register_pernet_gen_device I'm allowed to
not modify 'struct net' and friends and keep all I need in my own
pointer retrieved thru per-net gen-device id I've registered.

>
> If you use register_pernet_gen_device, your subsystem will be deleted before
> the network devices and potentially you can receive a packet even if your
> subsystem is already freed.
>
> Eric did a fix for tcp and icmp a few weeks ago. I thing its explanation is
> better than mine :)
> it is the commit 6eb0777228f31932fc941eafe8b08848466630a1 for net-2.6
>
> Thanks.
>  -- Daniel
>

Thanks a lot Daniel, will check!
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