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Date: Tue, 17 Apr 2012 18:25:57 +0800
From: Gao feng <gaofeng@...fujitsu.com>
To: Pablo Neira Ayuso <pablo@...filter.org>
CC: netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
ebiederm@...ssion.com, serge.hallyn@...onical.com,
dlezcano@...ibm.com
Subject: Re: [PATCH 02/12] netfilter: don't register sysctl when register
proto
于 2012年04月17日 16:56, Pablo Neira Ayuso 写道:
> On Tue, Apr 17, 2012 at 10:56:13AM +0800, Gao feng wrote:
>> delete nf_ct_l[3,4]proto_register_sysctl when register l[3,4]proto.
>> and add nf_ct_register_net_sysctl,nf_ct_unregister_net_sysctl to
>> register the sysctl for net namespace.
>>
>> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
>> ---
>> net/netfilter/nf_conntrack_proto.c | 109 +++++-------------------------------
>> 1 files changed, 15 insertions(+), 94 deletions(-)
>>
>> diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
>> index be3da2c..207cdd8 100644
>> --- a/net/netfilter/nf_conntrack_proto.c
>> +++ b/net/netfilter/nf_conntrack_proto.c
>> @@ -35,12 +35,15 @@ EXPORT_SYMBOL_GPL(nf_ct_l3protos);
>> static DEFINE_MUTEX(nf_ct_proto_mutex);
>>
>> #ifdef CONFIG_SYSCTL
>> -static int
>> -nf_ct_register_sysctl(struct ctl_table_header **header, struct ctl_path *path,
>> - struct ctl_table *table, unsigned int *users)
>> +int
>> +nf_ct_register_net_sysctl(struct net *net,
>> + struct ctl_table_header **header,
>> + struct ctl_path *path,
>> + struct ctl_table *table,
>> + unsigned int *users)
>
> Please, don't rename this function. Just add the *net parameter
> instead.
>
OK,i will modify it.
>> {
>> if (*header == NULL) {
>> - *header = register_sysctl_paths(path, table);
>> + *header = register_net_sysctl_table(net, path, table);
>> if (*header == NULL)
>> return -ENOMEM;
>> }
>> @@ -48,17 +51,21 @@ nf_ct_register_sysctl(struct ctl_table_header **header, struct ctl_path *path,
>> (*users)++;
>> return 0;
>> }
>> +EXPORT_SYMBOL_GPL(nf_ct_register_net_sysctl);
>>
>> -static void
>> -nf_ct_unregister_sysctl(struct ctl_table_header **header,
>> - struct ctl_table *table, unsigned int *users)
>> +void
>> +nf_ct_unregister_net_sysctl(struct ctl_table_header **header,
>> + struct ctl_table *table,
>> + unsigned int *users)
>> {
>> if (users != NULL && --*users > 0)
>> return;
>>
>> unregister_sysctl_table(*header);
>> + kfree(table);
>> *header = NULL;
>> }
>> +EXPORT_SYMBOL_GPL(nf_ct_unregister_net_sysctl);
>> #endif
>>
>> struct nf_conntrack_l4proto *
>> @@ -161,29 +168,6 @@ static int kill_l4proto(struct nf_conn *i, void *data)
>> nf_ct_l3num(i) == l4proto->l3proto;
>> }
>>
>> -static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto)
>> -{
>> - int err = 0;
>> -
>> -#ifdef CONFIG_SYSCTL
>> - if (l3proto->ctl_table != NULL) {
>> - err = nf_ct_register_sysctl(&l3proto->ctl_table_header,
>> - l3proto->ctl_table_path,
>> - l3proto->ctl_table, NULL);
>> - }
>> -#endif
>> - return err;
>> -}
>> -
>> -static void nf_ct_l3proto_unregister_sysctl(struct nf_conntrack_l3proto *l3proto)
>> -{
>> -#ifdef CONFIG_SYSCTL
>> - if (l3proto->ctl_table_header != NULL)
>> - nf_ct_unregister_sysctl(&l3proto->ctl_table_header,
>> - l3proto->ctl_table, NULL);
>> -#endif
>> -}
>> -
>> int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
>> {
>> int ret = 0;
>> @@ -203,10 +187,6 @@ int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
>> goto out_unlock;
>> }
>>
>> - ret = nf_ct_l3proto_register_sysctl(proto);
>> - if (ret < 0)
>> - goto out_unlock;
>> -
>> if (proto->nlattr_tuple_size)
>> proto->nla_size = 3 * proto->nlattr_tuple_size();
>>
>> @@ -230,7 +210,6 @@ void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
>> ) != proto);
>> rcu_assign_pointer(nf_ct_l3protos[proto->l3proto],
>> &nf_conntrack_l3proto_generic);
>> - nf_ct_l3proto_unregister_sysctl(proto);
>> mutex_unlock(&nf_ct_proto_mutex);
>>
>> synchronize_rcu();
>> @@ -243,52 +222,6 @@ void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
>> }
>> EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister);
>>
>> -static int nf_ct_l4proto_register_sysctl(struct nf_conntrack_l4proto *l4proto)
>> -{
>> - int err = 0;
>> -
>> -#ifdef CONFIG_SYSCTL
>> - if (l4proto->ctl_table != NULL) {
>> - err = nf_ct_register_sysctl(l4proto->ctl_table_header,
>> - nf_net_netfilter_sysctl_path,
>> - l4proto->ctl_table,
>> - l4proto->ctl_table_users);
>> - if (err < 0)
>> - goto out;
>> - }
>> -#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
>> - if (l4proto->ctl_compat_table != NULL) {
>> - err = nf_ct_register_sysctl(&l4proto->ctl_compat_table_header,
>> - nf_net_ipv4_netfilter_sysctl_path,
>> - l4proto->ctl_compat_table, NULL);
>> - if (err == 0)
>> - goto out;
>> - nf_ct_unregister_sysctl(l4proto->ctl_table_header,
>> - l4proto->ctl_table,
>> - l4proto->ctl_table_users);
>> - }
>> -#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
>> -out:
>> -#endif /* CONFIG_SYSCTL */
>> - return err;
>> -}
>> -
>> -static void nf_ct_l4proto_unregister_sysctl(struct nf_conntrack_l4proto *l4proto)
>> -{
>> -#ifdef CONFIG_SYSCTL
>> - if (l4proto->ctl_table_header != NULL &&
>> - *l4proto->ctl_table_header != NULL)
>> - nf_ct_unregister_sysctl(l4proto->ctl_table_header,
>> - l4proto->ctl_table,
>> - l4proto->ctl_table_users);
>> -#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
>> - if (l4proto->ctl_compat_table_header != NULL)
>> - nf_ct_unregister_sysctl(&l4proto->ctl_compat_table_header,
>> - l4proto->ctl_compat_table, NULL);
>> -#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
>> -#endif /* CONFIG_SYSCTL */
>> -}
>> -
>
> Where did this function go?
nf_ct_l4proto_unregister_sysctl just register sysctl,and we move this logic
to the pernet_operations.init, so this function has no use.
>
>> /* FIXME: Allow NULL functions and sub in pointers to generic for
>> them. --RR */
>> int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto)
>> @@ -333,10 +266,6 @@ int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto)
>> goto out_unlock;
>> }
>>
>> - ret = nf_ct_l4proto_register_sysctl(l4proto);
>> - if (ret < 0)
>> - goto out_unlock;
>> -
>> l4proto->nla_size = 0;
>> if (l4proto->nlattr_size)
>> l4proto->nla_size += l4proto->nlattr_size();
>> @@ -365,7 +294,6 @@ void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto)
>> ) != l4proto);
>> rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
>> &nf_conntrack_l4proto_generic);
>> - nf_ct_l4proto_unregister_sysctl(l4proto);
>> mutex_unlock(&nf_ct_proto_mutex);
>>
>> synchronize_rcu();
>> @@ -380,12 +308,7 @@ EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_unregister);
>>
>> int nf_conntrack_proto_init(void)
>> {
>> - unsigned int i;
>> - int err;
>> -
>> - err = nf_ct_l4proto_register_sysctl(&nf_conntrack_l4proto_generic);
>> - if (err < 0)
>> - return err;
>> + unsigned int i;
>>
>> for (i = 0; i < AF_MAX; i++)
>> rcu_assign_pointer(nf_ct_l3protos[i],
>> @@ -397,8 +320,6 @@ void nf_conntrack_proto_fini(void)
>> {
>> unsigned int i;
>>
>> - nf_ct_l4proto_unregister_sysctl(&nf_conntrack_l4proto_generic);
>> -
>> /* free l3proto protocol tables */
>> for (i = 0; i < PF_MAX; i++)
>> kfree(nf_ct_protos[i]);
>> --
>> 1.7.7.6
>>
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