Subject: Re: [PATCH 05/17] netfilter: add namespace support for l4proto_tcp

From: Gao feng <[email-masked]>
Date: Fri, 25 May 2012 14:05:40 +0800

于 2012年05月25日 11:00, Pablo Neira Ayuso 写道:
> Hi Gao,
> 
> While having a look at this again, I have two new requests:
> 
> On Mon, May 14, 2012 at 04:52:15PM +0800, Gao feng wrote:
> [...]
>> diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
>> index 4dfbfa8..dd19350 100644
>> --- a/net/netfilter/nf_conntrack_proto_tcp.c
>> +++ b/net/netfilter/nf_conntrack_proto_tcp.c
> [...]
>> @@ -1549,10 +1532,80 @@ static struct ctl_table tcp_compat_sysctl_table[] = {
>>  #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
>>  #endif /* CONFIG_SYSCTL */
>>
>> +static int tcp_init_net(struct net *net, u_int8_t compat)
>> +{
>> +	int i;
>> +	struct nf_tcp_net *tn = tcp_pernet(net);
>> +	struct nf_proto_net *pn = (struct nf_proto_net *)tn;
>> +#ifdef CONFIG_SYSCTL
>> +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
>> +	if (compat) {
>> +		pn->ctl_compat_table = kmemdup(tcp_compat_sysctl_table,
>> +					       sizeof(tcp_compat_sysctl_table),
>> +					       GFP_KERNEL);
>> +		if (!pn->ctl_compat_table)
>> +			return -ENOMEM;
>> +
>> +		pn->ctl_compat_table[0].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT];
>> +		pn->ctl_compat_table[1].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT2];
>> +		pn->ctl_compat_table[2].data = &tn->timeouts[TCP_CONNTRACK_SYN_RECV];
>> +		pn->ctl_compat_table[3].data = &tn->timeouts[TCP_CONNTRACK_ESTABLISHED];
>> +		pn->ctl_compat_table[4].data = &tn->timeouts[TCP_CONNTRACK_FIN_WAIT];
>> +		pn->ctl_compat_table[5].data = &tn->timeouts[TCP_CONNTRACK_CLOSE_WAIT];
>> +		pn->ctl_compat_table[6].data = &tn->timeouts[TCP_CONNTRACK_LAST_ACK];
>> +		pn->ctl_compat_table[7].data = &tn->timeouts[TCP_CONNTRACK_TIME_WAIT];
>> +		pn->ctl_compat_table[8].data = &tn->timeouts[TCP_CONNTRACK_CLOSE];
>> +		pn->ctl_compat_table[9].data = &tn->timeouts[TCP_CONNTRACK_RETRANS];
>> +		pn->ctl_compat_table[10].data = &tn->tcp_loose;
>> +		pn->ctl_compat_table[11].data = &tn->tcp_be_liberal;
>> +		pn->ctl_compat_table[12].data = &tn->tcp_max_retrans;
> 
> You can make a generic function to set the ctl_data that you can
> reuse for this code above and the one below.
> 

Actually I want reuse this code too,
But Unfortunately the ctl_data has different order or different size.
ctl_compat_table[1].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT2]
but
ctl_table[1].data = &tn->timeouts[TCP_CONNTRACK_SYN_RECV];

>> +	}
>> +#endif
>> +	if (!pn->ctl_table) {
>> +#else
>> +	if (!pn->user++) {
>> +#endif
>> +		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;
>> +#ifdef CONFIG_SYSCTL
>> +		pn->ctl_table = kmemdup(tcp_sysctl_table,
>> +					sizeof(tcp_sysctl_table),
>> +					GFP_KERNEL);
>> +		if (!pn->ctl_table) {
>> +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
>> +			if (compat) {
>> +				kfree(pn->ctl_compat_table);
>> +				pn->ctl_compat_table = NULL;
>> +			}
>> +#endif
>> +			return -ENOMEM;
>> +		}
>> +		pn->ctl_table[0].data = &tn->timeouts[TCP_CONNTRACK_SYN_SENT];
>> +		pn->ctl_table[1].data = &tn->timeouts[TCP_CONNTRACK_SYN_RECV];
>> +		pn->ctl_table[2].data = &tn->timeouts[TCP_CONNTRACK_ESTABLISHED];
>> +		pn->ctl_table[3].data = &tn->timeouts[TCP_CONNTRACK_FIN_WAIT];
>> +		pn->ctl_table[4].data = &tn->timeouts[TCP_CONNTRACK_CLOSE_WAIT];
>> +		pn->ctl_table[5].data = &tn->timeouts[TCP_CONNTRACK_LAST_ACK];
>> +		pn->ctl_table[6].data = &tn->timeouts[TCP_CONNTRACK_TIME_WAIT];
>> +		pn->ctl_table[7].data = &tn->timeouts[TCP_CONNTRACK_CLOSE];
>> +		pn->ctl_table[8].data = &tn->timeouts[TCP_CONNTRACK_RETRANS];
>> +		pn->ctl_table[9].data = &tn->timeouts[TCP_CONNTRACK_UNACK];
>> +		pn->ctl_table[10].data = &tn->tcp_loose;
>> +		pn->ctl_table[11].data = &tn->tcp_be_liberal;
>> +		pn->ctl_table[12].data = &tn->tcp_max_retrans;
>> +#endif
> 
> I have bad experience with code that has lots of #ifdef's.
> 
> Please, split all *_init_net into smaller functions.

It did look ugly,I will try my best to make code clear. ;)

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