netfilter: nf_ct_helper: move initialization out of pernet_operations

Move the global initial codes to the module_init/exit context.

Signed-off-by: Gao feng <[e-mail]>
Signed-off-by: Pablo Neira Ayuso <[e-mail]>

include/net/netfilter/nf_conntrack_helper.h

···
 	return (void *)help->data;
 }
 
-extern int nf_conntrack_helper_init(struct net *net);
-extern void nf_conntrack_helper_fini(struct net *net);
+extern int nf_conntrack_helper_pernet_init(struct net *net);
+extern void nf_conntrack_helper_pernet_fini(struct net *net);
+
+extern int nf_conntrack_helper_init(void);
+extern void nf_conntrack_helper_fini(void);
 
 extern int nf_conntrack_broadcast_help(struct sk_buff *skb,
 				       unsigned int protoff,

net/netfilter/nf_conntrack_core.c

···
 #ifdef CONFIG_NF_CONNTRACK_ZONES
 	nf_ct_extend_unregister(&nf_ct_zone_extend);
 #endif
+	nf_conntrack_helper_fini();
 	nf_conntrack_timeout_fini();
 	nf_conntrack_ecache_fini();
 	nf_conntrack_tstamp_fini();
···
 	nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size);
 	nf_conntrack_proto_fini(net);
 	nf_conntrack_labels_fini(net);
-	nf_conntrack_helper_fini(net);
+	nf_conntrack_helper_pernet_fini(net);
 	nf_conntrack_ecache_pernet_fini(net);
 	nf_conntrack_tstamp_pernet_fini(net);
 	nf_conntrack_acct_pernet_fini(net);
···
 	if (ret < 0)
 		goto err_timeout;
 
+	ret = nf_conntrack_helper_init();
+	if (ret < 0)
+		goto err_helper;
+
 #ifdef CONFIG_NF_CONNTRACK_ZONES
 	ret = nf_ct_extend_register(&nf_ct_zone_extend);
 	if (ret < 0)
···
 
 #ifdef CONFIG_NF_CONNTRACK_ZONES
 err_extend:
-	nf_conntrack_timeout_fini();
+	nf_conntrack_helper_fini();
 #endif
+err_helper:
+	nf_conntrack_timeout_fini();
 err_timeout:
 	nf_conntrack_ecache_fini();
 err_ecache:
···
 	ret = nf_conntrack_ecache_pernet_init(net);
 	if (ret < 0)
 		goto err_ecache;
-	ret = nf_conntrack_helper_init(net);
+	ret = nf_conntrack_helper_pernet_init(net);
 	if (ret < 0)
 		goto err_helper;
 
···
 err_proto:
 	nf_conntrack_labels_fini(net);
 err_labels:
-	nf_conntrack_helper_fini(net);
+	nf_conntrack_helper_pernet_fini(net);
 err_helper:
 	nf_conntrack_ecache_pernet_fini(net);
 err_ecache:

net/netfilter/nf_conntrack_helper.c

···
 	.id	= NF_CT_EXT_HELPER,
 };
 
-int nf_conntrack_helper_init(struct net *net)
+int nf_conntrack_helper_pernet_init(struct net *net)
 {
-	int err;
-
 	net->ct.auto_assign_helper_warned = false;
 	net->ct.sysctl_auto_assign_helper = nf_ct_auto_assign_helper;
-
-	if (net_eq(net, &init_net)) {
-		nf_ct_helper_hsize = 1; /* gets rounded up to use one page */
-		nf_ct_helper_hash =
-			nf_ct_alloc_hashtable(&nf_ct_helper_hsize, 0);
-		if (!nf_ct_helper_hash)
-			return -ENOMEM;
-
-		err = nf_ct_extend_register(&helper_extend);
-		if (err < 0)
-			goto err1;
-	}
-
-	err = nf_conntrack_helper_init_sysctl(net);
-	if (err < 0)
-		goto out_sysctl;
-
-	return 0;
-
-out_sysctl:
-	if (net_eq(net, &init_net))
-		nf_ct_extend_unregister(&helper_extend);
-err1:
-	nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_hsize);
-	return err;
+	return nf_conntrack_helper_init_sysctl(net);
 }
 
-void nf_conntrack_helper_fini(struct net *net)
+void nf_conntrack_helper_pernet_fini(struct net *net)
 {
 	nf_conntrack_helper_fini_sysctl(net);
-	if (net_eq(net, &init_net)) {
-		nf_ct_extend_unregister(&helper_extend);
-		nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_hsize);
+}
+
+int nf_conntrack_helper_init(void)
+{
+	int ret;
+	nf_ct_helper_hsize = 1; /* gets rounded up to use one page */
+	nf_ct_helper_hash =
+		nf_ct_alloc_hashtable(&nf_ct_helper_hsize, 0);
+	if (!nf_ct_helper_hash)
+		return -ENOMEM;
+
+	ret = nf_ct_extend_register(&helper_extend);
+	if (ret < 0) {
+		pr_err("nf_ct_helper: Unable to register helper extension.\n");
+		goto out_extend;
 	}
+
+	return 0;
+out_extend:
+	nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_hsize);
+	return ret;
+}
+
+void nf_conntrack_helper_fini(void)
+{
+	nf_ct_extend_unregister(&helper_extend);
+	nf_ct_free_hashtable(nf_ct_helper_hash, nf_ct_helper_hsize);
 }