netfilter: ip6tables: unregister the tables by name

Same as the previous patch, but for ip6tables.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/linux/netfilter_ipv6/ip6_tables.h

@@ -27,9 +27,9 @@ extern void *ip6t_alloc_initial_table(const struct xt_table *);
 int ip6t_register_table(struct net *net, const struct xt_table *table,
 			const struct ip6t_replace *repl,
 			const struct nf_hook_ops *ops, struct xt_table **res);
-void ip6t_unregister_table_pre_exit(struct net *net, struct xt_table *table,
+void ip6t_unregister_table_pre_exit(struct net *net, const char *name,
 				    const struct nf_hook_ops *ops);
-void ip6t_unregister_table_exit(struct net *net, struct xt_table *table);
+void ip6t_unregister_table_exit(struct net *net, const char *name);
 extern unsigned int ip6t_do_table(struct sk_buff *skb,
 				  const struct nf_hook_state *state,
 				  struct xt_table *table);

net/ipv6/netfilter/ip6_tables.c

@@ -1769,14 +1769,20 @@ int ip6t_register_table(struct net *net, const struct xt_table *table,
 	return ret;
 }
 
-void ip6t_unregister_table_pre_exit(struct net *net, struct xt_table *table,
+void ip6t_unregister_table_pre_exit(struct net *net, const char *name,
 				    const struct nf_hook_ops *ops)
 {
+	struct xt_table *table = xt_find_table(net, NFPROTO_IPV6, name);
+
+	if (table)
 		nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks));
 }
 
-void ip6t_unregister_table_exit(struct net *net, struct xt_table *table)
+void ip6t_unregister_table_exit(struct net *net, const char *name)
 {
+	struct xt_table *table = xt_find_table(net, NFPROTO_IPV6, name);
+
+	if (table)
 		__ip6t_unregister_table(net, table);
 }
 

net/ipv6/netfilter/ip6table_filter.c

@@ -75,16 +75,13 @@ static int __net_init ip6table_filter_net_init(struct net *net)
 
 static void __net_exit ip6table_filter_net_pre_exit(struct net *net)
 {
-	if (net->ipv6.ip6table_filter)
-		ip6t_unregister_table_pre_exit(net, net->ipv6.ip6table_filter,
+	ip6t_unregister_table_pre_exit(net, "filter",
 				       filter_ops);
 }
 
 static void __net_exit ip6table_filter_net_exit(struct net *net)
 {
-	if (!net->ipv6.ip6table_filter)
-		return;
-	ip6t_unregister_table_exit(net, net->ipv6.ip6table_filter);
+	ip6t_unregister_table_exit(net, "filter");
 	net->ipv6.ip6table_filter = NULL;
 }
 

net/ipv6/netfilter/ip6table_mangle.c

@@ -95,17 +95,12 @@ static int __net_init ip6table_mangle_table_init(struct net *net)
 
 static void __net_exit ip6table_mangle_net_pre_exit(struct net *net)
 {
-	if (net->ipv6.ip6table_mangle)
-		ip6t_unregister_table_pre_exit(net, net->ipv6.ip6table_mangle,
-					       mangle_ops);
+	ip6t_unregister_table_pre_exit(net, "mangle", mangle_ops);
 }
 
 static void __net_exit ip6table_mangle_net_exit(struct net *net)
 {
-	if (!net->ipv6.ip6table_mangle)
-		return;
-
-	ip6t_unregister_table_exit(net, net->ipv6.ip6table_mangle);
+	ip6t_unregister_table_exit(net, "mangle");
 	net->ipv6.ip6table_mangle = NULL;
 }
 

net/ipv6/netfilter/ip6table_nat.c

@@ -107,7 +107,7 @@ static int __net_init ip6table_nat_table_init(struct net *net)
 
 	ret = ip6t_nat_register_lookups(net);
 	if (ret < 0) {
-		ip6t_unregister_table_exit(net, net->ipv6.ip6table_nat);
+		ip6t_unregister_table_exit(net, "nat");
 		net->ipv6.ip6table_nat = NULL;
 	}
 	kfree(repl);
@@ -122,9 +122,7 @@ static void __net_exit ip6table_nat_net_pre_exit(struct net *net)
 
 static void __net_exit ip6table_nat_net_exit(struct net *net)
 {
-	if (!net->ipv6.ip6table_nat)
-		return;
-	ip6t_unregister_table_exit(net, net->ipv6.ip6table_nat);
+	ip6t_unregister_table_exit(net, "nat");
 	net->ipv6.ip6table_nat = NULL;
 }
 

net/ipv6/netfilter/ip6table_raw.c

@@ -68,16 +68,13 @@ static int __net_init ip6table_raw_table_init(struct net *net)
 
 static void __net_exit ip6table_raw_net_pre_exit(struct net *net)
 {
-	if (net->ipv6.ip6table_raw)
-		ip6t_unregister_table_pre_exit(net, net->ipv6.ip6table_raw,
+	ip6t_unregister_table_pre_exit(net, "raw",
 				       rawtable_ops);
 }
 
 static void __net_exit ip6table_raw_net_exit(struct net *net)
 {
-	if (!net->ipv6.ip6table_raw)
-		return;
-	ip6t_unregister_table_exit(net, net->ipv6.ip6table_raw);
+	ip6t_unregister_table_exit(net, "raw");
 	net->ipv6.ip6table_raw = NULL;
 }
 

net/ipv6/netfilter/ip6table_security.c

@@ -63,16 +63,12 @@ static int __net_init ip6table_security_table_init(struct net *net)
 
 static void __net_exit ip6table_security_net_pre_exit(struct net *net)
 {
-	if (net->ipv6.ip6table_security)
-		ip6t_unregister_table_pre_exit(net, net->ipv6.ip6table_security,
-					       sectbl_ops);
+	ip6t_unregister_table_pre_exit(net, "security", sectbl_ops);
 }
 
 static void __net_exit ip6table_security_net_exit(struct net *net)
 {
-	if (!net->ipv6.ip6table_security)
-		return;
-	ip6t_unregister_table_exit(net, net->ipv6.ip6table_security);
+	ip6t_unregister_table_exit(net, "security");
 	net->ipv6.ip6table_security = NULL;
 }