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,
58 .lock = __RW_LOCK_UNLOCKED(__frame_nat.lock),
62 static struct ebt_table *frame_nat;
65 ebt_nat_dst(unsigned int hook, struct sk_buff *skb, const struct net_device *in
66 , const struct net_device *out, int (*okfn)(struct sk_buff *))
68 return ebt_do_table(hook, skb, in, out, frame_nat);
72 ebt_nat_src(unsigned int hook, struct sk_buff *skb, const struct net_device *in
73 , const struct net_device *out, int (*okfn)(struct sk_buff *))
75 return ebt_do_table(hook, skb, in, out, frame_nat);
78 static struct nf_hook_ops ebt_ops_nat[] __read_mostly = {
83 .hooknum = NF_BR_LOCAL_OUT,
84 .priority = NF_BR_PRI_NAT_DST_OTHER,
90 .hooknum = NF_BR_POST_ROUTING,
91 .priority = NF_BR_PRI_NAT_SRC,
97 .hooknum = NF_BR_PRE_ROUTING,
98 .priority = NF_BR_PRI_NAT_DST_BRIDGED,
102 static int __init ebtable_nat_init(void)
106 frame_nat = ebt_register_table(&init_net, &__frame_nat);
107 if (IS_ERR(frame_nat))
108 return PTR_ERR(frame_nat);
109 ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
111 ebt_unregister_table(frame_nat);
115 static void __exit ebtable_nat_fini(void)
117 nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
118 ebt_unregister_table(frame_nat);
121 module_init(ebtable_nat_init);
122 module_exit(ebtable_nat_fini);
123 MODULE_LICENSE("GPL");