[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>

3 files changed, 86 insertions, 32 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);
diff --git a/net/ipv6/netfilter/ip6table_mangle.c b/net/ipv6/netfilter/ip6table_mangle.c
index abdfece4ab82..035343a90ffe 100644
--- a/net/ipv6/netfilter/ip6table_mangle.c
+++ b/net/ipv6/netfilter/ip6table_mangle.c
@@ -26,7 +26,7 @@ static struct
         struct ip6t_replace repl;
         struct ip6t_standard entries[5];
         struct ip6t_error term;
-} initial_table __initdata = {
+} initial_table __net_initdata = {
         .repl = {
                 .name = "mangle",
                 .valid_hooks = MANGLE_VALID_HOOKS,
@@ -57,14 +57,13 @@ static struct
         .term = IP6T_ERROR_INIT,                /* ERROR */
 };
 
-static struct xt_table __packet_mangler = {
+static struct xt_table packet_mangler = {
         .name           = "mangle",
         .valid_hooks    = MANGLE_VALID_HOOKS,
         .lock           = RW_LOCK_UNLOCKED,
         .me             = THIS_MODULE,
         .af             = AF_INET6,
 };
-static struct xt_table *packet_mangler;
 
 /* The work comes in here from netfilter.c. */
 static unsigned int
@@ -74,7 +73,7 @@ ip6t_route_hook(unsigned int hook,
          const struct net_device *out,
          int (*okfn)(struct sk_buff *))
 {
-        return ip6t_do_table(skb, hook, in, out, packet_mangler);
+        return ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_mangle);
 }
 
 static unsigned int
@@ -109,7 +108,7 @@ ip6t_local_hook(unsigned int hook,
         /* flowlabel and prio (includes version, which shouldn't change either */
         flowlabel = *((u_int32_t *)ipv6_hdr(skb));
 
-        ret = ip6t_do_table(skb, hook, in, out, packet_mangler);
+        ret = ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_mangle);
 
         if (ret != NF_DROP && ret != NF_STOLEN
                 && (memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr))
@@ -159,14 +158,33 @@ static struct nf_hook_ops ip6t_ops[] __read_mostly = {
         },
 };
 
+static int __net_init ip6table_mangle_net_init(struct net *net)
+{
+        /* Register table */
+        net->ipv6.ip6table_mangle =
+                ip6t_register_table(net, &packet_mangler, &initial_table.repl);
+        if (IS_ERR(net->ipv6.ip6table_mangle))
+                return PTR_ERR(net->ipv6.ip6table_mangle);
+        return 0;
+}
+
+static void __net_exit ip6table_mangle_net_exit(struct net *net)
+{
+        ip6t_unregister_table(net->ipv6.ip6table_mangle);
+}
+
+static struct pernet_operations ip6table_mangle_net_ops = {
+        .init = ip6table_mangle_net_init,
+        .exit = ip6table_mangle_net_exit,
+};
+
 static int __init ip6table_mangle_init(void)
 {
         int ret;
 
-        /* Register table */
-        packet_mangler = ip6t_register_table(&init_net, &__packet_mangler, &initial_table.repl);
-        if (IS_ERR(packet_mangler))
-                return PTR_ERR(packet_mangler);
+        ret = register_pernet_subsys(&ip6table_mangle_net_ops);
+        if (ret < 0)
+                return ret;
 
         /* Register hooks */
         ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
@@ -176,14 +194,14 @@ static int __init ip6table_mangle_init(void)
         return ret;
 
  cleanup_table:
-        ip6t_unregister_table(packet_mangler);
+        unregister_pernet_subsys(&ip6table_mangle_net_ops);
         return ret;
 }
 
 static void __exit ip6table_mangle_fini(void)
 {
         nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
-        ip6t_unregister_table(packet_mangler);
+        unregister_pernet_subsys(&ip6table_mangle_net_ops);
 }
 
 module_init(ip6table_mangle_init);
diff --git a/net/ipv6/netfilter/ip6table_raw.c b/net/ipv6/netfilter/ip6table_raw.c
index 12acd6300903..5cd84203abfe 100644
--- a/net/ipv6/netfilter/ip6table_raw.c
+++ b/net/ipv6/netfilter/ip6table_raw.c
@@ -13,7 +13,7 @@ static struct
         struct ip6t_replace repl;
         struct ip6t_standard entries[2];
         struct ip6t_error term;
-} initial_table __initdata = {
+} initial_table __net_initdata = {
         .repl = {
                 .name = "raw",
                 .valid_hooks = RAW_VALID_HOOKS,
@@ -35,14 +35,13 @@ static struct
         .term = IP6T_ERROR_INIT,                /* ERROR */
 };
 
-static struct xt_table __packet_raw = {
+static struct xt_table packet_raw = {
         .name = "raw",
         .valid_hooks = RAW_VALID_HOOKS,
         .lock = RW_LOCK_UNLOCKED,
         .me = THIS_MODULE,
         .af = AF_INET6,
 };
-static struct xt_table *packet_raw;
 
 /* The work comes in here from netfilter.c. */
 static unsigned int
@@ -52,7 +51,7 @@ ip6t_hook(unsigned int hook,
          const struct net_device *out,
          int (*okfn)(struct sk_buff *))
 {
-        return ip6t_do_table(skb, hook, in, out, packet_raw);
+        return ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_raw);
 }
 
 static struct nf_hook_ops ip6t_ops[] __read_mostly = {
@@ -72,14 +71,33 @@ static struct nf_hook_ops ip6t_ops[] __read_mostly = {
         },
 };
 
+static int __net_init ip6table_raw_net_init(struct net *net)
+{
+        /* Register table */
+        net->ipv6.ip6table_raw =
+                ip6t_register_table(net, &packet_raw, &initial_table.repl);
+        if (IS_ERR(net->ipv6.ip6table_raw))
+                return PTR_ERR(net->ipv6.ip6table_raw);
+        return 0;
+}
+
+static void __net_exit ip6table_raw_net_exit(struct net *net)
+{
+        ip6t_unregister_table(net->ipv6.ip6table_raw);
+}
+
+static struct pernet_operations ip6table_raw_net_ops = {
+        .init = ip6table_raw_net_init,
+        .exit = ip6table_raw_net_exit,
+};
+
 static int __init ip6table_raw_init(void)
 {
         int ret;
 
-        /* Register table */
-        packet_raw = ip6t_register_table(&init_net, &__packet_raw, &initial_table.repl);
-        if (IS_ERR(packet_raw))
-                return PTR_ERR(packet_raw);
+        ret = register_pernet_subsys(&ip6table_raw_net_ops);
+        if (ret < 0)
+                return ret;
 
         /* Register hooks */
         ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
@@ -89,14 +107,14 @@ static int __init ip6table_raw_init(void)
         return ret;
 
  cleanup_table:
-        ip6t_unregister_table(packet_raw);
+        unregister_pernet_subsys(&ip6table_raw_net_ops);
         return ret;
 }
 
 static void __exit ip6table_raw_fini(void)
 {
         nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
-        ip6t_unregister_table(packet_raw);
+        unregister_pernet_subsys(&ip6table_raw_net_ops);
 }
 
 module_init(ip6table_raw_init);