netfilter: netns nat: per-netns NAT table

[linux-2.6-omap-h63xx.git] / net / ipv4 / netfilter / nf_nat_rule.c

diff --git a/net/ipv4/netfilter/nf_nat_rule.c b/net/ipv4/netfilter/nf_nat_rule.c
index ee39ed87bb08decb01f7e8b2d8ec7dd702ad77cd..0a02a8caf3b3b1821cf0b690d9ffea4608362da3 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,
@@ -61,7 +61,7 @@ static struct
 static struct xt_table nat_table = {
        .name           = "nat",
        .valid_hooks    = NAT_VALID_HOOKS,
-       .lock           = RW_LOCK_UNLOCKED,
+       .lock           = __RW_LOCK_UNLOCKED(__nat_table.lock),
        .me             = THIS_MODULE,
        .af             = AF_INET,
 };
@@ -87,7 +87,7 @@ static unsigned int ipt_snat_target(struct sk_buff *skb,
                            ctinfo == IP_CT_RELATED + IP_CT_IS_REPLY));
        NF_CT_ASSERT(out);
 
-       return nf_nat_setup_info(ct, &mr->range[0], hooknum);
+       return nf_nat_setup_info(ct, &mr->range[0], IP_NAT_MANIP_SRC);
 }
 
 /* Before 2.6.11 we did implicit source NAT if required. Warn about change. */
@@ -97,7 +97,7 @@ static void warn_if_extra_mangle(__be32 dstip, __be32 srcip)
        struct flowi fl = { .nl_u = { .ip4_u = { .daddr = dstip } } };
        struct rtable *rt;
 
-       if (ip_route_output_key(&rt, &fl) != 0)
+       if (ip_route_output_key(&init_net, &rt, &fl) != 0)
                return;
 
        if (rt->rt_src != srcip && !warned) {
@@ -133,7 +133,7 @@ static unsigned int ipt_dnat_target(struct sk_buff *skb,
                warn_if_extra_mangle(ip_hdr(skb)->daddr,
                                     mr->range[0].min_ip);
 
-       return nf_nat_setup_info(ct, &mr->range[0], hooknum);
+       return nf_nat_setup_info(ct, &mr->range[0], IP_NAT_MANIP_DST);
 }
 
 static bool ipt_snat_checkentry(const char *tablename,
@@ -142,7 +142,7 @@ static bool ipt_snat_checkentry(const char *tablename,
                                void *targinfo,
                                unsigned int hook_mask)
 {
-       struct nf_nat_multi_range_compat *mr = targinfo;
+       const struct nf_nat_multi_range_compat *mr = targinfo;
 
        /* Must be a valid range */
        if (mr->rangesize != 1) {
@@ -158,7 +158,7 @@ static bool ipt_dnat_checkentry(const char *tablename,
                                void *targinfo,
                                unsigned int hook_mask)
 {
-       struct nf_nat_multi_range_compat *mr = targinfo;
+       const struct nf_nat_multi_range_compat *mr = targinfo;
 
        /* Must be a valid range */
        if (mr->rangesize != 1) {
@@ -184,26 +184,7 @@ alloc_null_binding(struct nf_conn *ct, unsigned int hooknum)
 
        pr_debug("Allocating NULL binding for %p (%u.%u.%u.%u)\n",
                 ct, NIPQUAD(ip));
-       return nf_nat_setup_info(ct, &range, hooknum);
-}
-
-unsigned int
-alloc_null_binding_confirmed(struct nf_conn *ct, unsigned int hooknum)
-{
-       __be32 ip
-               = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
-                  ? ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip
-                  : ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip);
-       __be16 all
-               = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
-                  ? ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.all
-                  : ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u.all);
-       struct nf_nat_range range
-               = { IP_NAT_RANGE_MAP_IPS, ip, ip, { all }, { all } };
-
-       pr_debug("Allocating NULL binding for confirmed %p (%u.%u.%u.%u)\n",
-                ct, NIPQUAD(ip));
-       return nf_nat_setup_info(ct, &range, hooknum);
+       return nf_nat_setup_info(ct, &range, HOOK2MANIP(hooknum));
 }
 
 int nf_nat_rule_find(struct sk_buff *skb,
@@ -212,9 +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)))
@@ -244,13 +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;
 
-       ret = ipt_register_table(&nat_table, &nat_initial_table.repl);
+       ret = register_pernet_subsys(&nf_nat_rule_net_ops);
        if (ret != 0)
-               return ret;
+               goto out;
        ret = xt_register_target(&ipt_snat_reg);
        if (ret != 0)
                goto unregister_table;
@@ -264,8 +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;
 }
 
@@ -273,5 +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);
 }