netfilter: netns nat: per-netns NAT table

Same story as with iptable_filter, iptables_raw tables.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index a6ed838..b286b84 100644 (file)
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -38,6 +38,7 @@ struct netns_ipv4 {
        struct xt_table         *iptable_raw;
        struct xt_table         *arptable_filter;
        struct xt_table         *iptable_security;
+       struct xt_table         *nat_table;
 #endif
 
        int sysctl_icmp_echo_ignore_all;

diff --git a/net/ipv4/netfilter/nf_nat_rule.c b/net/ipv4/netfilter/nf_nat_rule.c
index e8b4d0d..0a02a8c 100644 (file)
--- a/net/ipv4/netfilter/nf_nat_rule.c
+++ b/net/ipv4/netfilter/nf_nat_rule.c
@@ -33,7 +33,7 @@ static struct
        struct ipt_replace repl;
        struct ipt_standard entries[3];
        struct ipt_error term;
-} nat_initial_table __initdata = {
+} nat_initial_table __net_initdata = {
        .repl = {
                .name = "nat",
                .valid_hooks = NAT_VALID_HOOKS,
@@ -58,14 +58,13 @@ static struct
        .term = IPT_ERROR_INIT,                 /* ERROR */
 };
 
-static struct xt_table __nat_table = {
+static struct xt_table nat_table = {
        .name           = "nat",
        .valid_hooks    = NAT_VALID_HOOKS,
        .lock           = __RW_LOCK_UNLOCKED(__nat_table.lock),
        .me             = THIS_MODULE,
        .af             = AF_INET,
 };
-static struct xt_table *nat_table;
 
 /* Source NAT */
 static unsigned int ipt_snat_target(struct sk_buff *skb,
@@ -194,9 +193,10 @@ int nf_nat_rule_find(struct sk_buff *skb,
                     const struct net_device *out,
                     struct nf_conn *ct)
 {
+       struct net *net = nf_ct_net(ct);
        int ret;
 
-       ret = ipt_do_table(skb, hooknum, in, out, nat_table);
+       ret = ipt_do_table(skb, hooknum, in, out, net->ipv4.nat_table);
 
        if (ret == NF_ACCEPT) {
                if (!nf_nat_initialized(ct, HOOK2MANIP(hooknum)))
@@ -226,14 +226,32 @@ static struct xt_target ipt_dnat_reg __read_mostly = {
        .family         = AF_INET,
 };
 
+static int __net_init nf_nat_rule_net_init(struct net *net)
+{
+       net->ipv4.nat_table = ipt_register_table(net, &nat_table,
+                                                &nat_initial_table.repl);
+       if (IS_ERR(net->ipv4.nat_table))
+               return PTR_ERR(net->ipv4.nat_table);
+       return 0;
+}
+
+static void __net_exit nf_nat_rule_net_exit(struct net *net)
+{
+       ipt_unregister_table(net->ipv4.nat_table);
+}
+
+static struct pernet_operations nf_nat_rule_net_ops = {
+       .init = nf_nat_rule_net_init,
+       .exit = nf_nat_rule_net_exit,
+};
+
 int __init nf_nat_rule_init(void)
 {
        int ret;
 
-       nat_table = ipt_register_table(&init_net, &__nat_table,
-                                      &nat_initial_table.repl);
-       if (IS_ERR(nat_table))
-               return PTR_ERR(nat_table);
+       ret = register_pernet_subsys(&nf_nat_rule_net_ops);
+       if (ret != 0)
+               goto out;
        ret = xt_register_target(&ipt_snat_reg);
        if (ret != 0)
                goto unregister_table;
@@ -247,8 +265,8 @@ int __init nf_nat_rule_init(void)
  unregister_snat:
        xt_unregister_target(&ipt_snat_reg);
  unregister_table:
-       ipt_unregister_table(nat_table);
-
+       unregister_pernet_subsys(&nf_nat_rule_net_ops);
+ out:
        return ret;
 }
 
@@ -256,5 +274,5 @@ void nf_nat_rule_cleanup(void)
 {
        xt_unregister_target(&ipt_dnat_reg);
        xt_unregister_target(&ipt_snat_reg);
-       ipt_unregister_table(nat_table);
+       unregister_pernet_subsys(&nf_nat_rule_net_ops);
 }