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Date:	Thu, 24 May 2012 16:40:38 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Gao feng <gaofeng@...fujitsu.com>
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

On Thu, May 24, 2012 at 07:07:36PM +0800, Gao feng wrote:
> 于 2012年05月24日 17:52, Pablo Neira Ayuso 写道:
> > On Thu, May 24, 2012 at 09:13:36AM +0800, Gao feng wrote:
> >> 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);
> > 
> > Yes, all protocol trackers included in nf_conntrack_proto_init:
> > 
> >         err = nf_conntrack_proto_generic_init(net);
> >         ...
> >         err = nf_conntrack_proto_tcp_init(net);
> >         ...
> > 
> > and so on.
> 
> sounds good,but the l4protos except l4proto_generic are enabled by
> insmod modules(such as nf_conntrack_ipv4,nf_conntrack_proto_udplite).
> 
> So I think it makes no sense to init all protocol here, unless we decide
> to put those protos into module nf_conntrack.

Sorry, I meant to say all protocols that are built-in.

So, just put there those that are built-in, like TCP, UDP and generic
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