netdev - Re: [PATCH net-next v2 01/12] netfilter: fix problem with proto register

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Message-ID: <20120616105037.GA18251@1984>
Date:	Sat, 16 Jun 2012 12:50:37 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Gao feng <gaofeng@...fujitsu.com>
Cc:	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH net-next v2 01/12] netfilter: fix problem with proto
 register

On Sat, Jun 16, 2012 at 11:41:12AM +0800, Gao feng wrote:
> commit 2c352f444ccfa966a1aa4fd8e9ee29381c467448
> (netfilter: nf_conntrack: prepare namespace support for
> l4 protocol trackers) register proto before register sysctl.
> 
> it changes the behavior that when register sysctl failed, the
> proto should not be registered too.
> 
> so change to register sysctl before register protos.

Could you explain why we need to change the order in the registration?
ie. now first proto->init_net then sysctl things.

> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
> ---
>  net/netfilter/nf_conntrack_proto.c |   37 ++++++++++++++++++++++-------------
>  1 files changed, 23 insertions(+), 14 deletions(-)
> 
> diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
> index 1ea9194..a434dd7 100644
> --- a/net/netfilter/nf_conntrack_proto.c
> +++ b/net/netfilter/nf_conntrack_proto.c
> @@ -253,18 +253,23 @@ int nf_conntrack_l3proto_register(struct net *net,
>  {
>  	int ret = 0;
>  
> -	if (net == &init_net)
> -		ret = nf_conntrack_l3proto_register_net(proto);
> +	if (proto->init_net) {
> +		ret = proto->init_net(net);
> +		if (ret < 0)
> +			return ret;
> +	}
>  
> +	ret = nf_ct_l3proto_register_sysctl(net, proto);
>  	if (ret < 0)
>  		return ret;
>  
> -	if (proto->init_net) {
> -		ret = proto->init_net(net);
> +	if (net == &init_net) {
> +		ret = nf_conntrack_l3proto_register_net(proto);
>  		if (ret < 0)
> -			return ret;
> +			nf_ct_l3proto_unregister_sysctl(net, proto);
>  	}
> -	return nf_ct_l3proto_register_sysctl(net, proto);
> +
> +	return ret;
>  }
>  EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register);
>  
> @@ -454,19 +459,23 @@ int nf_conntrack_l4proto_register(struct net *net,
>  				  struct nf_conntrack_l4proto *l4proto)
>  {
>  	int ret = 0;
> -	if (net == &init_net)
> -		ret = nf_conntrack_l4proto_register_net(l4proto);
> -
> -	if (ret < 0)
> -		return ret;
> -
> -	if (l4proto->init_net)
> +	if (l4proto->init_net) {
>  		ret = l4proto->init_net(net);
> +		if (ret < 0)
> +			return ret;
> +	}
>  
> +	ret = nf_ct_l4proto_register_sysctl(net, l4proto);
>  	if (ret < 0)
>  		return ret;
>  
> -	return nf_ct_l4proto_register_sysctl(net, l4proto);
> +	if (net == &init_net) {
> +		ret = nf_conntrack_l4proto_register_net(l4proto);
> +		if (ret < 0)
> +			nf_ct_l4proto_unregister_sysctl(net, l4proto);
> +	}
> +
> +	return ret;
>  }
>  EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_register);
>  
> -- 
> 1.7.7.6
> 
> --
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