[NETFILTER]: x_tables: create per-netns /proc/net/*_tables_*

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netfilter/x_tables.h

@@ -357,8 +357,8 @@ extern struct xt_table *xt_find_table_lock(struct net *net, int af,
 					   const char *name);
 extern void xt_table_unlock(struct xt_table *t);
 
-extern int xt_proto_init(int af);
-extern void xt_proto_fini(int af);
+extern int xt_proto_init(struct net *net, int af);
+extern void xt_proto_fini(struct net *net, int af);
 
 extern struct xt_table_info *xt_alloc_table_info(unsigned int size);
 extern void xt_free_table_info(struct xt_table_info *info);

net/ipv4/netfilter/arp_tables.c

@@ -1822,11 +1822,26 @@ static struct nf_sockopt_ops arpt_sockopts = {
 	.owner		= THIS_MODULE,
 };
 
+static int __net_init arp_tables_net_init(struct net *net)
+{
+	return xt_proto_init(net, NF_ARP);
+}
+
+static void __net_exit arp_tables_net_exit(struct net *net)
+{
+	xt_proto_fini(net, NF_ARP);
+}
+
+static struct pernet_operations arp_tables_net_ops = {
+	.init = arp_tables_net_init,
+	.exit = arp_tables_net_exit,
+};
+
 static int __init arp_tables_init(void)
 {
 	int ret;
 
-	ret = xt_proto_init(NF_ARP);
+	ret = register_pernet_subsys(&arp_tables_net_ops);
 	if (ret < 0)
 		goto err1;
 
@@ -1851,7 +1866,7 @@ err4:
 err3:
 	xt_unregister_target(&arpt_standard_target);
 err2:
-	xt_proto_fini(NF_ARP);
+	unregister_pernet_subsys(&arp_tables_net_ops);
 err1:
 	return ret;
 }
@@ -1861,7 +1876,7 @@ static void __exit arp_tables_fini(void)
 	nf_unregister_sockopt(&arpt_sockopts);
 	xt_unregister_target(&arpt_error_target);
 	xt_unregister_target(&arpt_standard_target);
-	xt_proto_fini(NF_ARP);
+	unregister_pernet_subsys(&arp_tables_net_ops);
 }
 
 EXPORT_SYMBOL(arpt_register_table);

net/ipv4/netfilter/ip_tables.c

@@ -2213,11 +2213,26 @@ static struct xt_match icmp_matchstruct __read_mostly = {
 	.family		= AF_INET,
 };
 
+static int __net_init ip_tables_net_init(struct net *net)
+{
+	return xt_proto_init(net, AF_INET);
+}
+
+static void __net_exit ip_tables_net_exit(struct net *net)
+{
+	xt_proto_fini(net, AF_INET);
+}
+
+static struct pernet_operations ip_tables_net_ops = {
+	.init = ip_tables_net_init,
+	.exit = ip_tables_net_exit,
+};
+
 static int __init ip_tables_init(void)
 {
 	int ret;
 
-	ret = xt_proto_init(AF_INET);
+	ret = register_pernet_subsys(&ip_tables_net_ops);
 	if (ret < 0)
 		goto err1;
 
@@ -2247,7 +2262,7 @@ err4:
 err3:
 	xt_unregister_target(&ipt_standard_target);
 err2:
-	xt_proto_fini(AF_INET);
+	unregister_pernet_subsys(&ip_tables_net_ops);
 err1:
 	return ret;
 }
@@ -2260,7 +2275,7 @@ static void __exit ip_tables_fini(void)
 	xt_unregister_target(&ipt_error_target);
 	xt_unregister_target(&ipt_standard_target);
 
-	xt_proto_fini(AF_INET);
+	unregister_pernet_subsys(&ip_tables_net_ops);
 }
 
 EXPORT_SYMBOL(ipt_register_table);

net/ipv6/netfilter/ip6_tables.c

@@ -2238,11 +2238,26 @@ static struct xt_match icmp6_matchstruct __read_mostly = {
 	.family		= AF_INET6,
 };
 
+static int __net_init ip6_tables_net_init(struct net *net)
+{
+	return xt_proto_init(net, AF_INET6);
+}
+
+static void __net_exit ip6_tables_net_exit(struct net *net)
+{
+	xt_proto_fini(net, AF_INET6);
+}
+
+static struct pernet_operations ip6_tables_net_ops = {
+	.init = ip6_tables_net_init,
+	.exit = ip6_tables_net_exit,
+};
+
 static int __init ip6_tables_init(void)
 {
 	int ret;
 
-	ret = xt_proto_init(AF_INET6);
+	ret = register_pernet_subsys(&ip6_tables_net_ops);
 	if (ret < 0)
 		goto err1;
 
@@ -2272,7 +2287,7 @@ err4:
 err3:
 	xt_unregister_target(&ip6t_standard_target);
 err2:
-	xt_proto_fini(AF_INET6);
+	unregister_pernet_subsys(&ip6_tables_net_ops);
 err1:
 	return ret;
 }
@@ -2284,7 +2299,8 @@ static void __exit ip6_tables_fini(void)
 	xt_unregister_match(&icmp6_matchstruct);
 	xt_unregister_target(&ip6t_error_target);
 	xt_unregister_target(&ip6t_standard_target);
-	xt_proto_fini(AF_INET6);
+
+	unregister_pernet_subsys(&ip6_tables_net_ops);
 }
 
 /*

net/netfilter/x_tables.c

@@ -922,7 +922,7 @@ static const struct file_operations xt_target_ops = {
 
 #endif /* CONFIG_PROC_FS */
 
-int xt_proto_init(int af)
+int xt_proto_init(struct net *net, int af)
 {
 #ifdef CONFIG_PROC_FS
 	char buf[XT_FUNCTION_MAXNAMELEN];
@@ -936,7 +936,7 @@ int xt_proto_init(int af)
 #ifdef CONFIG_PROC_FS
 	strlcpy(buf, xt_prefix[af], sizeof(buf));
 	strlcat(buf, FORMAT_TABLES, sizeof(buf));
-	proc = proc_net_fops_create(&init_net, buf, 0440, &xt_table_ops);
+	proc = proc_net_fops_create(net, buf, 0440, &xt_table_ops);
 	if (!proc)
 		goto out;
 	proc->data = (void *)(unsigned long)af;
@@ -944,14 +944,14 @@ int xt_proto_init(int af)
 
 	strlcpy(buf, xt_prefix[af], sizeof(buf));
 	strlcat(buf, FORMAT_MATCHES, sizeof(buf));
-	proc = proc_net_fops_create(&init_net, buf, 0440, &xt_match_ops);
+	proc = proc_net_fops_create(net, buf, 0440, &xt_match_ops);
 	if (!proc)
 		goto out_remove_tables;
 	proc->data = (void *)(unsigned long)af;
 
 	strlcpy(buf, xt_prefix[af], sizeof(buf));
 	strlcat(buf, FORMAT_TARGETS, sizeof(buf));
-	proc = proc_net_fops_create(&init_net, buf, 0440, &xt_target_ops);
+	proc = proc_net_fops_create(net, buf, 0440, &xt_target_ops);
 	if (!proc)
 		goto out_remove_matches;
 	proc->data = (void *)(unsigned long)af;
@@ -963,34 +963,34 @@ int xt_proto_init(int af)
 out_remove_matches:
 	strlcpy(buf, xt_prefix[af], sizeof(buf));
 	strlcat(buf, FORMAT_MATCHES, sizeof(buf));
-	proc_net_remove(&init_net, buf);
+	proc_net_remove(net, buf);
 
 out_remove_tables:
 	strlcpy(buf, xt_prefix[af], sizeof(buf));
 	strlcat(buf, FORMAT_TABLES, sizeof(buf));
-	proc_net_remove(&init_net, buf);
+	proc_net_remove(net, buf);
 out:
 	return -1;
 #endif
 }
 EXPORT_SYMBOL_GPL(xt_proto_init);
 
-void xt_proto_fini(int af)
+void xt_proto_fini(struct net *net, int af)
 {
 #ifdef CONFIG_PROC_FS
 	char buf[XT_FUNCTION_MAXNAMELEN];
 
 	strlcpy(buf, xt_prefix[af], sizeof(buf));
 	strlcat(buf, FORMAT_TABLES, sizeof(buf));
-	proc_net_remove(&init_net, buf);
+	proc_net_remove(net, buf);
 
 	strlcpy(buf, xt_prefix[af], sizeof(buf));
 	strlcat(buf, FORMAT_TARGETS, sizeof(buf));
-	proc_net_remove(&init_net, buf);
+	proc_net_remove(net, buf);
 
 	strlcpy(buf, xt_prefix[af], sizeof(buf));
 	strlcat(buf, FORMAT_MATCHES, sizeof(buf));
-	proc_net_remove(&init_net, buf);
+	proc_net_remove(net, buf);
 #endif /*CONFIG_PROC_FS*/
 }
 EXPORT_SYMBOL_GPL(xt_proto_fini);