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

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Date:	Tue, 10 Mar 2009 11:33:47 +0100
From:	Daniel Lezcano <daniel.lezcano@...e.fr>
To:	Cyrill Gorcunov <gorcunov@...il.com>
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

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 ?
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
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