From: Gao feng <gaofeng@cn.fujitsu.com>
To: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: netfilter-devel@vger.kernel.org, netdev@vger.kernel.org,
serge.hallyn@canonical.com, ebiederm@xmission.com,
dlezcano@fr.ibm.com, Gao feng <gaofeng@cn.fujitus.com>
Subject: Re: [PATCH 01/17] netfilter: add struct nf_proto_net for register l4proto sysctl
Date: Fri, 25 May 2012 14:02:37 +0800 [thread overview]
Message-ID: <4FBF207D.80809@cn.fujitsu.com> (raw)
In-Reply-To: <20120525025451.GA21076@1984>
于 2012年05月25日 10:54, Pablo Neira Ayuso 写道:
> On Fri, May 25, 2012 at 09:05:34AM +0800, Gao feng wrote:
>> 于 2012年05月24日 22:38, Pablo Neira Ayuso 写道:
>>> On Thu, May 24, 2012 at 06:54:42PM +0800, Gao feng wrote:
>>> [...]
>>>>>>> I don't see why we need this new field.
>>>>>>>
>>>>>>> It seems to be set to 1 in each structure that has set:
>>>>>>>
>>>>>>> .ctl_compat_table
>>>>>>>
>>>>>>> to non-NULL. So, it's redundant.
>>>>>>>
>>>>>>> Moreover, you already know from the protocol tracker itself if you
>>>>>>> have to allocate the compat ctl table or not.
>>>>>>>
>>>>>>> In other words: You set compat to 1 for nf_conntrack_l4proto_generic.
>>>>>>> Then, you pass that compat value to generic_init_net via ->inet_net
>>>>>>> again, but this information (that determines if the compat has to be
>>>>>>> done or not) is already in the scope of the protocol tracker.
>>>>>>>
>>>>>>
>>>>>> because some protocols such l4proto_tcp6 and l4proto_tcp use the same init_net
>>>>>> function. the l4proto_tcp6 doesn't need compat sysctl, so we should use this new
>>>>>> field to identify if we should kmemdup compat_sysctl_table.
>>>>>
>>>>> Then, could you use two init_net functions? one for TCP for IPv4 and another
>>>>> for TCP for IPv6?
>>>>
>>>> Of cause, if you prefer to impletment it in this way.
>>>
>>> If this removes the .compat field that you added, then use two
>>> init_net functions, yes.
>>
>> Sorry I miss something.
>>
>> nf_ct_l4proto_unregister_sysctl also uses .compat to identify if we
>> can unregister the compat sysctl.
>>
>> if we register l4proto_tcp and l4proto_tcp6 both. without .compat,
>> when unregister l4proto_tcp6, the compat sysctl will be unregister too.
>>
>> So maybe we have to use .compat.
>
> Could you resolve this by checking pn->ctl_compat_header != NULL ?
pn->ctl_table_header and ctl_compat_header is shared by l4proto_tcp and l4proto_tcp6.
if we both register l4proto_tcp and l4proto_tcp6, when unregister l4proto_tcp6
pn->ctl_compat_header must not be NULL.
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next prev parent reply other threads:[~2012-05-25 6:02 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-14 8:52 [PATCH v3 00/17] netfilter: add namespace support for netfilter protos Gao feng
2012-05-14 8:52 ` [PATCH 01/17] netfilter: add struct nf_proto_net for register l4proto sysctl Gao feng
2012-05-23 10:12 ` Pablo Neira Ayuso
2012-05-24 1:35 ` Gao feng
2012-05-24 9:58 ` Pablo Neira Ayuso
2012-05-24 10:54 ` Gao feng
2012-05-24 14:38 ` Pablo Neira Ayuso
2012-05-25 1:05 ` Gao feng
2012-05-25 2:54 ` Pablo Neira Ayuso
2012-05-25 6:02 ` Gao feng [this message]
2012-05-26 2:28 ` Gao feng
2012-05-28 9:53 ` Pablo Neira Ayuso
2012-05-14 8:52 ` [PATCH 02/17] netfilter: add namespace support for l4proto Gao feng
2012-05-23 10:25 ` Pablo Neira Ayuso
2012-05-24 1:52 ` Gao feng
2012-05-24 10:00 ` Pablo Neira Ayuso
2012-05-14 8:52 ` [PATCH 03/17] netfilter: add namespace support for l3proto Gao feng
2012-05-23 10:29 ` Pablo Neira Ayuso
2012-05-24 1:58 ` Gao feng
2012-05-24 10:04 ` Pablo Neira Ayuso
2012-05-24 10:57 ` Gao feng
2012-05-14 8:52 ` [PATCH 04/17] netfilter: add namespace support for l4proto_generic Gao feng
2012-05-23 10:32 ` Pablo Neira Ayuso
2012-05-24 1:13 ` Gao feng
2012-05-24 9:52 ` Pablo Neira Ayuso
2012-05-24 11:07 ` Gao feng
2012-05-24 14:40 ` Pablo Neira Ayuso
2012-05-26 2:36 ` Gao feng
2012-05-28 9:54 ` Pablo Neira Ayuso
2012-05-14 8:52 ` [PATCH 05/17] netfilter: add namespace support for l4proto_tcp Gao feng
2012-05-25 3:00 ` Pablo Neira Ayuso
2012-05-25 6:05 ` Gao feng
2012-05-14 8:52 ` [PATCH 06/17] netfilter: add namespace support for l4proto_udp Gao feng
2012-05-14 8:52 ` [PATCH 07/17] netfilter: add namespace support for l4proto_icmp Gao feng
2012-05-14 8:52 ` [PATCH 08/17] netfilter: add namespace support for l4proto_icmpv6 Gao feng
2012-05-14 8:52 ` [PATCH 09/17] netfilter: add namespace support for l3proto_ipv4 Gao feng
2012-05-14 8:52 ` [PATCH 10/17] netfilter: add namespace support for l3proto_ipv6 Gao feng
2012-05-14 8:52 ` [PATCH 11/17] netfilter: add namespace support for l4proto_sctp Gao feng
2012-05-14 8:52 ` [PATCH 12/17] netfilter: add namespace support for l4proto_udplite Gao feng
2012-05-14 8:52 ` [PATCH 13/17] netfilter: adjust l4proto_dccp to the nf_conntrack_l4proto_register Gao feng
2012-05-14 8:52 ` [PATCH 14/17] netfilter: adjust l4proto_gre4 " Gao feng
2012-05-14 8:52 ` [PATCH 15/17] netfilter: cleanup sysctl for l4proto and l3proto Gao feng
2012-05-23 10:38 ` Pablo Neira Ayuso
2012-05-24 0:59 ` Gao feng
2012-05-24 9:56 ` Pablo Neira Ayuso
2012-05-14 8:52 ` [PATCH 16/17] netfilter: add namespace support for cttimeout Gao feng
2012-05-23 10:41 ` Pablo Neira Ayuso
2012-05-24 1:04 ` Gao feng
2012-05-14 8:52 ` [PATCH 17/17] netfilter: cttimeout use pernet data of l4proto Gao feng
2012-05-21 8:52 ` [PATCH v3 00/17] netfilter: add namespace support for netfilter protos Gao feng
2012-05-23 10:42 ` Pablo Neira Ayuso
-- strict thread matches above, loose matches on Subject: below --
2012-04-27 9:37 [PATCH v2 " Gao feng
2012-04-27 9:37 ` [PATCH 01/17] netfilter: add struct nf_proto_net for register l4proto sysctl Gao feng
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