netdev - Re: net/netfilter/nf_conntrack_proto_tcp.c:1606:9: error: ‘struct nf_proto

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Date:	Wed, 13 Jun 2012 10:06:49 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
CC:	David Miller <davem@...emloft.net>, wfg@...ux.intel.com,
	netdev@...r.kernel.org
Subject: Re: net/netfilter/nf_conntrack_proto_tcp.c:1606:9: error: ‘struct nf_proto_net’ has no member named ‘user’

于 2012年06月13日 00:03, Pablo Neira Ayuso 写道:
> On Tue, Jun 12, 2012 at 07:03:31PM +0800, Gao feng wrote:
>> 于 2012年06月12日 17:29, Pablo Neira Ayuso 写道:
>>
>>>> nf_proto_net.users has different meaning when SYSCTL enabled or disabled.
>>>>
>>>> when SYSCTL enabled,it means if both tcpv4 and tcpv6 register the sysctl,
>>>> it is increased when register sysctl success and decreased when unregister sysctl.
>>>> we can regard it as the refcnt of ctl_table.
>>>>
>>>> when SYSCTL disabled,it just used to identify if the proto's pernet data
>>>> has been initialized.
>>>
>>> We have to use two different counters for this. The conditional
>>> meaning of that variable is really confusing.
>>>
>> Hi David & Pablo
>>
>> Please have a look at this patch and tell me if it's OK.
>> it base on Pable's patch.
> 
> I think we have to merge those tcpv4_init_net and tcpv6_init_net
> functions into one single function tcp_init_net. Then, we can pass
> l4proto->l3proto to init_net:
> 
>         if (proto->init_net) {
>                 ret = proto->init_net(net, l4proto->l3proto);
>                 if (ret < 0)
>                         return ret;
>         }
> 
> Thus, we can check if this is IPv4 or IPv6 and initialize the compat
> part accordingly.

Agree, it will be more clearer and will decrease the redundancy codes.

> 
> Still, we have that pn->users thing:
> 
>         if (!pn->users++) {
>                 for (i = 0; i < TCP_CONNTRACK_TIMEOUT_MAX; i++)
>                         tn->timeouts[i] = tcp_timeouts[i];
> 
>                 tn->tcp_loose = nf_ct_tcp_loose;
>                 tn->tcp_be_liberal = nf_ct_tcp_be_liberal;
>                 tn->tcp_max_retrans = nf_ct_tcp_max_retrans;
>         }
> 
> Define some pn->initialized boolean. Set it to true at the end of
> the new tcp_init_net.
> 
> Similar thing for other protocol trackers.
> 
> Let me know if you are going to send me patches. In that case, please
> do it on top of the current tree.

Ok,I will clean up it as you said.

> 
> Once that has been cleaned up, we can prepare follow-up patches to
> move the sysctl code to nf_conntrack_proto_*_sysctl.c to reduce the
> ifdef pollution.
> 

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