1 files changed, 40 insertions, 18 deletions

diff --git a/net/ipv6/netfilter/ip6table_nat.c b/net/ipv6/netfilter/ip6table_nat.c
index 0a23265e3caa..b0292251e655 100644
--- a/net/ipv6/netfilter/ip6table_nat.c
+++ b/net/ipv6/netfilter/ip6table_nat.c
@@ -15,8 +15,14 @@
 
 #include <net/netfilter/nf_nat.h>
 
+struct ip6table_nat_pernet {
+	struct nf_hook_ops *nf_nat_ops;
+};
+
 static int __net_init ip6table_nat_table_init(struct net *net);
 
+static unsigned int ip6table_nat_net_id __read_mostly;
+
 static const struct xt_table nf_nat_ipv6_table = {
 	.name		= "nat",
 	.valid_hooks	= (1 << NF_INET_PRE_ROUTING) |
@@ -32,7 +38,7 @@ static unsigned int ip6table_nat_do_chain(void *priv,
 					  struct sk_buff *skb,
 					  const struct nf_hook_state *state)
 {
-	return ip6t_do_table(skb, state, state->net->ipv6.ip6table_nat);
+	return ip6t_do_table(skb, state, priv);
 }
 
 static const struct nf_hook_ops nf_nat_ipv6_ops[] = {
@@ -64,27 +70,49 @@ static const struct nf_hook_ops nf_nat_ipv6_ops[] = {
 
 static int ip6t_nat_register_lookups(struct net *net)
 {
+	struct ip6table_nat_pernet *xt_nat_net;
+	struct nf_hook_ops *ops;
+	struct xt_table *table;
 	int i, ret;
 
+	table = xt_find_table(net, NFPROTO_IPV6, "nat");
+	if (WARN_ON_ONCE(!table))
+		return -ENOENT;
+
+	xt_nat_net = net_generic(net, ip6table_nat_net_id);
+	ops = kmemdup(nf_nat_ipv6_ops, sizeof(nf_nat_ipv6_ops), GFP_KERNEL);
+	if (!ops)
+		return -ENOMEM;
+
 	for (i = 0; i < ARRAY_SIZE(nf_nat_ipv6_ops); i++) {
-		ret = nf_nat_ipv6_register_fn(net, &nf_nat_ipv6_ops[i]);
+		ops[i].priv = table;
+		ret = nf_nat_ipv6_register_fn(net, &ops[i]);
 		if (ret) {
 			while (i)
-				nf_nat_ipv6_unregister_fn(net, &nf_nat_ipv6_ops[--i]);
+				nf_nat_ipv6_unregister_fn(net, &ops[--i]);
 
+			kfree(ops);
 			return ret;
 		}
 	}
 
+	xt_nat_net->nf_nat_ops = ops;
 	return 0;
 }
 
 static void ip6t_nat_unregister_lookups(struct net *net)
 {
+	struct ip6table_nat_pernet *xt_nat_net = net_generic(net, ip6table_nat_net_id);
+	struct nf_hook_ops *ops = xt_nat_net->nf_nat_ops;
 	int i;
 
+	if (!ops)
+		return;
+
 	for (i = 0; i < ARRAY_SIZE(nf_nat_ipv6_ops); i++)
-		nf_nat_ipv6_unregister_fn(net, &nf_nat_ipv6_ops[i]);
+		nf_nat_ipv6_unregister_fn(net, &ops[i]);
+
+	kfree(ops);
 }
 
 static int __net_init ip6table_nat_table_init(struct net *net)
@@ -92,45 +120,39 @@ static int __net_init ip6table_nat_table_init(struct net *net)
 	struct ip6t_replace *repl;
 	int ret;
 
-	if (net->ipv6.ip6table_nat)
-		return 0;
-
 	repl = ip6t_alloc_initial_table(&nf_nat_ipv6_table);
 	if (repl == NULL)
 		return -ENOMEM;
 	ret = ip6t_register_table(net, &nf_nat_ipv6_table, repl,
-				  NULL, &net->ipv6.ip6table_nat);
+				  NULL);
 	if (ret < 0) {
 		kfree(repl);
 		return ret;
 	}
 
 	ret = ip6t_nat_register_lookups(net);
-	if (ret < 0) {
-		ip6t_unregister_table(net, net->ipv6.ip6table_nat, NULL);
-		net->ipv6.ip6table_nat = NULL;
-	}
+	if (ret < 0)
+		ip6t_unregister_table_exit(net, "nat");
+
 	kfree(repl);
 	return ret;
 }
 
 static void __net_exit ip6table_nat_net_pre_exit(struct net *net)
 {
-	if (net->ipv6.ip6table_nat)
-		ip6t_nat_unregister_lookups(net);
+	ip6t_nat_unregister_lookups(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);
-	net->ipv6.ip6table_nat = NULL;
+	ip6t_unregister_table_exit(net, "nat");
 }
 
 static struct pernet_operations ip6table_nat_net_ops = {
 	.pre_exit = ip6table_nat_net_pre_exit,
 	.exit	= ip6table_nat_net_exit,
+	.id	= &ip6table_nat_net_id,
+	.size	= sizeof(struct ip6table_nat_pernet),
 };
 
 static int __init ip6table_nat_init(void)