5 * Bart De Schuymer <bdschuym@pandora.be>
11 #include <linux/netfilter_bridge/ebtables.h>
12 #include <linux/module.h>
14 #define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
15 (1 << NF_BR_POST_ROUTING))
17 static struct ebt_entries initial_chains[] =
28 .name = "POSTROUTING",
33 static struct ebt_replace_kernel initial_table =
36 .valid_hooks = NAT_VALID_HOOKS,
37 .entries_size = 3 * sizeof(struct ebt_entries),
39 [NF_BR_PRE_ROUTING] = &initial_chains[0],
40 [NF_BR_LOCAL_OUT] = &initial_chains[1],
41 [NF_BR_POST_ROUTING] = &initial_chains[2],
43 .entries = (char *)initial_chains,
46 static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
48 if (valid_hooks & ~NAT_VALID_HOOKS)
53 static struct ebt_table frame_nat =
56 .table = &initial_table,
57 .valid_hooks = NAT_VALID_HOOKS,
63 ebt_nat_in(const struct nf_hook_ops *ops, struct sk_buff *skb,
64 const struct net_device *in, const struct net_device *out,
65 int (*okfn)(struct sk_buff *))
67 return ebt_do_table(ops->hooknum, skb, in, out,
68 dev_net(in)->xt.frame_nat);
72 ebt_nat_out(const struct nf_hook_ops *ops, struct sk_buff *skb,
73 const struct net_device *in, const struct net_device *out,
74 int (*okfn)(struct sk_buff *))
76 return ebt_do_table(ops->hooknum, skb, in, out,
77 dev_net(out)->xt.frame_nat);
80 static struct nf_hook_ops ebt_ops_nat[] __read_mostly = {
85 .hooknum = NF_BR_LOCAL_OUT,
86 .priority = NF_BR_PRI_NAT_DST_OTHER,
92 .hooknum = NF_BR_POST_ROUTING,
93 .priority = NF_BR_PRI_NAT_SRC,
99 .hooknum = NF_BR_PRE_ROUTING,
100 .priority = NF_BR_PRI_NAT_DST_BRIDGED,
104 static int __net_init frame_nat_net_init(struct net *net)
106 net->xt.frame_nat = ebt_register_table(net, &frame_nat);
107 return PTR_ERR_OR_ZERO(net->xt.frame_nat);
110 static void __net_exit frame_nat_net_exit(struct net *net)
112 ebt_unregister_table(net, net->xt.frame_nat);
115 static struct pernet_operations frame_nat_net_ops = {
116 .init = frame_nat_net_init,
117 .exit = frame_nat_net_exit,
120 static int __init ebtable_nat_init(void)
124 ret = register_pernet_subsys(&frame_nat_net_ops);
127 ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
129 unregister_pernet_subsys(&frame_nat_net_ops);
133 static void __exit ebtable_nat_fini(void)
135 nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
136 unregister_pernet_subsys(&frame_nat_net_ops);
139 module_init(ebtable_nat_init);
140 module_exit(ebtable_nat_fini);
141 MODULE_LICENSE("GPL");