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

From: Gao feng <[email-masked]>
Date: Mon, 18 Jun 2012 08:59:11 +0800

于 2012年06月16日 18:50, Pablo Neira Ayuso 写道:
> 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.

before commit 2c352f444ccfa966a1aa4fd8e9ee29381c467448, we register sysctl before
register protos, so if sysctl is registered faild, the protos will not be registered.

but now, we register protos first, and when register sysctl failed, we can use protos
too, it's different from before.

> 
>> Signed-off-by: Gao feng <[email-masked]>
>> ---
>>  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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