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[] = {
27 .name = "POSTROUTING",
32 static struct ebt_replace_kernel initial_table = {
34 .valid_hooks = NAT_VALID_HOOKS,
35 .entries_size = 3 * sizeof(struct ebt_entries),
37 [NF_BR_PRE_ROUTING] = &initial_chains[0],
38 [NF_BR_LOCAL_OUT] = &initial_chains[1],
39 [NF_BR_POST_ROUTING] = &initial_chains[2],
41 .entries = (char *)initial_chains,
44 static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
46 if (valid_hooks & ~NAT_VALID_HOOKS)
51 static struct ebt_table frame_nat = {
53 .table = &initial_table,
54 .valid_hooks = NAT_VALID_HOOKS,
60 ebt_nat_in(const struct nf_hook_ops *ops, struct sk_buff *skb,
61 const struct net_device *in, const struct net_device *out,
62 int (*okfn)(struct sk_buff *))
64 return ebt_do_table(ops->hooknum, skb, in, out,
65 dev_net(in)->xt.frame_nat);
69 ebt_nat_out(const struct nf_hook_ops *ops, struct sk_buff *skb,
70 const struct net_device *in, const struct net_device *out,
71 int (*okfn)(struct sk_buff *))
73 return ebt_do_table(ops->hooknum, skb, in, out,
74 dev_net(out)->xt.frame_nat);
77 static struct nf_hook_ops ebt_ops_nat[] __read_mostly = {
82 .hooknum = NF_BR_LOCAL_OUT,
83 .priority = NF_BR_PRI_NAT_DST_OTHER,
89 .hooknum = NF_BR_POST_ROUTING,
90 .priority = NF_BR_PRI_NAT_SRC,
96 .hooknum = NF_BR_PRE_ROUTING,
97 .priority = NF_BR_PRI_NAT_DST_BRIDGED,
101 static int __net_init frame_nat_net_init(struct net *net)
103 net->xt.frame_nat = ebt_register_table(net, &frame_nat);
104 return PTR_ERR_OR_ZERO(net->xt.frame_nat);
107 static void __net_exit frame_nat_net_exit(struct net *net)
109 ebt_unregister_table(net, net->xt.frame_nat);
112 static struct pernet_operations frame_nat_net_ops = {
113 .init = frame_nat_net_init,
114 .exit = frame_nat_net_exit,
117 static int __init ebtable_nat_init(void)
121 ret = register_pernet_subsys(&frame_nat_net_ops);
124 ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
126 unregister_pernet_subsys(&frame_nat_net_ops);
130 static void __exit ebtable_nat_fini(void)
132 nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
133 unregister_pernet_subsys(&frame_nat_net_ops);
136 module_init(ebtable_nat_init);
137 module_exit(ebtable_nat_fini);
138 MODULE_LICENSE("GPL");