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Date:	Thu, 24 May 2012 09:13:36 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
CC:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	serge.hallyn@...onical.com, ebiederm@...ssion.com,
	dlezcano@...ibm.com
Subject: Re: [PATCH 04/17] netfilter: add namespace support for l4proto_generic

于 2012年05月23日 18:32, Pablo Neira Ayuso 写道:
> On Mon, May 14, 2012 at 04:52:14PM +0800, Gao feng wrote:
>> implement and export nf_conntrack_proto_generic_[init,fini],
>> nf_conntrack_[init,cleanup]_net call them to register or unregister
>> the sysctl of generic proto.
>>
>> implement generic_net_init,it's used to initial the pernet
>> data for generic proto.
>>
>> and use nf_generic_net.timeout to replace nf_ct_generic_timeout in
>> get_timeouts function.
>>
>> Acked-by: Eric W. Biederman <ebiederm@...ssion.com>
>> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
>> ---
>>  include/net/netfilter/nf_conntrack_l4proto.h |    2 +
>>  include/net/netns/conntrack.h                |    6 +++
>>  net/netfilter/nf_conntrack_core.c            |    8 +++-
>>  net/netfilter/nf_conntrack_proto.c           |   21 +++++-----
>>  net/netfilter/nf_conntrack_proto_generic.c   |   55 ++++++++++++++++++++++++-
>>  5 files changed, 76 insertions(+), 16 deletions(-)
>>
>> diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
>> index a93dcd5..0d329b9 100644
>> --- a/include/net/netfilter/nf_conntrack_l4proto.h
>> +++ b/include/net/netfilter/nf_conntrack_l4proto.h
>> @@ -118,6 +118,8 @@ struct nf_conntrack_l4proto {
>>  
>>  /* Existing built-in generic protocol */
>>  extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
>> +extern int nf_conntrack_proto_generic_init(struct net *net);
>> +extern void nf_conntrack_proto_generic_fini(struct net *net);
>>  
>>  #define MAX_NF_CT_PROTO 256
>>  
>> diff --git a/include/net/netns/conntrack.h b/include/net/netns/conntrack.h
>> index 94992e9..3381b80 100644
>> --- a/include/net/netns/conntrack.h
>> +++ b/include/net/netns/conntrack.h
>> @@ -20,7 +20,13 @@ struct nf_proto_net {
>>  	unsigned int		users;
>>  };
>>  
>> +struct nf_generic_net {
>> +	struct nf_proto_net pn;
>> +	unsigned int timeout;
>> +};
>> +
>>  struct nf_ip_net {
>> +	struct nf_generic_net   generic;
>>  #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
>>  	struct ctl_table_header *ctl_table_header;
>>  	struct ctl_table	*ctl_table;
>> diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
>> index 32c5909..fd33e91 100644
>> --- a/net/netfilter/nf_conntrack_core.c
>> +++ b/net/netfilter/nf_conntrack_core.c
>> @@ -1353,6 +1353,7 @@ static void nf_conntrack_cleanup_net(struct net *net)
>>  	}
>>  
>>  	nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size);
>> +	nf_conntrack_proto_generic_fini(net);
>>  	nf_conntrack_helper_fini(net);
>>  	nf_conntrack_timeout_fini(net);
>>  	nf_conntrack_ecache_fini(net);
>> @@ -1586,9 +1587,12 @@ static int nf_conntrack_init_net(struct net *net)
>>  	ret = nf_conntrack_helper_init(net);
>>  	if (ret < 0)
>>  		goto err_helper;
>> -
>> +	ret = nf_conntrack_proto_generic_init(net);
>> +	if (ret < 0)
>> +		goto err_generic;
>>  	return 0;
>> -
>> +err_generic:
>> +	nf_conntrack_helper_fini(net);
>>  err_helper:
>>  	nf_conntrack_timeout_fini(net);
>>  err_timeout:
>> diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
>> index 7ee6653..9b4bf6d 100644
>> --- a/net/netfilter/nf_conntrack_proto.c
>> +++ b/net/netfilter/nf_conntrack_proto.c
>> @@ -287,10 +287,16 @@ EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister);
>>  static struct nf_proto_net *nf_ct_l4proto_net(struct net *net,
>>  					      struct nf_conntrack_l4proto *l4proto)
>>  {
>> -	if (l4proto->net_id)
>> -		return net_generic(net, *l4proto->net_id);
>> -	else
>> -		return NULL;
>> +	switch (l4proto->l4proto) {
>> +	case 255: /* l4proto_generic */
>> +		return (struct nf_proto_net *)&net->ct.proto.generic;
>> +	default:
>> +		if (l4proto->net_id)
>> +			return net_generic(net, *l4proto->net_id);
>> +		else
>> +			return NULL;
>> +	}
>> +	return NULL;
>>  }
>>  
>>  int nf_ct_l4proto_register_sysctl(struct net *net,
>> @@ -457,11 +463,6 @@ EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_unregister);
>>  int nf_conntrack_proto_init(void)
>>  {
>>  	unsigned int i;
>> -	int err;
>> -
>> -	err = nf_ct_l4proto_register_sysctl(&init_net, &nf_conntrack_l4proto_generic);
>> -	if (err < 0)
>> -		return err;
> 
> I like that all protocols sysctl are registered by
> nf_conntrack_proto_init. Can you keep using that?

you mean per-net's generic_proto sysctl are registered by
nf_conntrack_proto_init?

such as

int nf_conntrack_proto_init(struct net *net)
{
	...
	err = nf_ct_l4proto_register_sysctl(net, &nf_conntrack_l4proto_generic);
	...
}

if my understanding is right,my answer is yes we can ;)

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