[NETFILTER]: ip6_tables: per-netns IPv6 FILTER, MANGLE, RAW

Now it's possible to list and manipulate per-netns ip6tables rules.
Filtering decisions are based on init_net's table so far.

P.S.: remove init_net check in inet6_create() to see the effect

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>

1 files changed, 29 insertions, 11 deletions

diff --git a/net/ipv6/netfilter/ip6table_filter.c b/net/ipv6/netfilter/ip6table_filter.c
index d0bf71d40cc5..2d9cd095a72c 100644
--- a/net/ipv6/netfilter/ip6table_filter.c
+++ b/net/ipv6/netfilter/ip6table_filter.c
@@ -26,7 +26,7 @@ static struct
 	struct ip6t_replace repl;
 	struct ip6t_standard entries[3];
 	struct ip6t_error term;
-} initial_table __initdata = {
+} initial_table __net_initdata = {
 	.repl = {
 		.name = "filter",
 		.valid_hooks = FILTER_VALID_HOOKS,
@@ -51,14 +51,13 @@ static struct
 	.term = IP6T_ERROR_INIT,		/* ERROR */
 };
 
-static struct xt_table __packet_filter = {
+static struct xt_table packet_filter = {
 	.name		= "filter",
 	.valid_hooks	= FILTER_VALID_HOOKS,
 	.lock		= RW_LOCK_UNLOCKED,
 	.me		= THIS_MODULE,
 	.af		= AF_INET6,
 };
-static struct xt_table *packet_filter;
 
 /* The work comes in here from netfilter.c. */
 static unsigned int
@@ -68,7 +67,7 @@ ip6t_hook(unsigned int hook,
 	 const struct net_device *out,
 	 int (*okfn)(struct sk_buff *))
 {
-	return ip6t_do_table(skb, hook, in, out, packet_filter);
+	return ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_filter);
 }
 
 static unsigned int
@@ -88,7 +87,7 @@ ip6t_local_out_hook(unsigned int hook,
 	}
 #endif
 
-	return ip6t_do_table(skb, hook, in, out, packet_filter);
+	return ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_filter);
 }
 
 static struct nf_hook_ops ip6t_ops[] __read_mostly = {
@@ -119,6 +118,26 @@ static struct nf_hook_ops ip6t_ops[] __read_mostly = {
 static int forward = NF_ACCEPT;
 module_param(forward, bool, 0000);
 
+static int __net_init ip6table_filter_net_init(struct net *net)
+{
+	/* Register table */
+	net->ipv6.ip6table_filter =
+		ip6t_register_table(net, &packet_filter, &initial_table.repl);
+	if (IS_ERR(net->ipv6.ip6table_filter))
+		return PTR_ERR(net->ipv6.ip6table_filter);
+	return 0;
+}
+
+static void __net_exit ip6table_filter_net_exit(struct net *net)
+{
+	ip6t_unregister_table(net->ipv6.ip6table_filter);
+}
+
+static struct pernet_operations ip6table_filter_net_ops = {
+	.init = ip6table_filter_net_init,
+	.exit = ip6table_filter_net_exit,
+};
+
 static int __init ip6table_filter_init(void)
 {
 	int ret;
@@ -131,10 +150,9 @@ static int __init ip6table_filter_init(void)
 	/* Entry 1 is the FORWARD hook */
 	initial_table.entries[1].target.verdict = -forward - 1;
 
-	/* Register table */
-	packet_filter = ip6t_register_table(&init_net, &__packet_filter, &initial_table.repl);
-	if (IS_ERR(packet_filter))
-		return PTR_ERR(packet_filter);
+	ret = register_pernet_subsys(&ip6table_filter_net_ops);
+	if (ret < 0)
+		return ret;
 
 	/* Register hooks */
 	ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
@@ -144,14 +162,14 @@ static int __init ip6table_filter_init(void)
 	return ret;
 
  cleanup_table:
-	ip6t_unregister_table(packet_filter);
+	unregister_pernet_subsys(&ip6table_filter_net_ops);
 	return ret;
 }
 
 static void __exit ip6table_filter_fini(void)
 {
 	nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
-	ip6t_unregister_table(packet_filter);
+	unregister_pernet_subsys(&ip6table_filter_net_ops);
 }
 
 module_init(ip6table_filter_init);