5 * Bart De Schuymer <bdschuym@pandora.be>
11 #include <linux/netfilter_bridge/ebtables.h>
12 #include <uapi/linux/netfilter_bridge.h>
13 #include <linux/module.h>
15 #define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
16 (1 << NF_BR_POST_ROUTING))
18 static struct ebt_entries initial_chains[] = {
28 .name = "POSTROUTING",
33 static struct ebt_replace_kernel initial_table = {
35 .valid_hooks = NAT_VALID_HOOKS,
36 .entries_size = 3 * sizeof(struct ebt_entries),
38 [NF_BR_PRE_ROUTING] = &initial_chains[0],
39 [NF_BR_LOCAL_OUT] = &initial_chains[1],
40 [NF_BR_POST_ROUTING] = &initial_chains[2],
42 .entries = (char *)initial_chains,
45 static const struct ebt_table frame_nat = {
47 .table = &initial_table,
48 .valid_hooks = NAT_VALID_HOOKS,
53 ebt_nat_in(void *priv, struct sk_buff *skb,
54 const struct nf_hook_state *state)
56 return ebt_do_table(skb, state, state->net->xt.frame_nat);
60 ebt_nat_out(void *priv, struct sk_buff *skb,
61 const struct nf_hook_state *state)
63 return ebt_do_table(skb, state, state->net->xt.frame_nat);
66 static const struct nf_hook_ops ebt_ops_nat[] = {
70 .hooknum = NF_BR_LOCAL_OUT,
71 .priority = NF_BR_PRI_NAT_DST_OTHER,
76 .hooknum = NF_BR_POST_ROUTING,
77 .priority = NF_BR_PRI_NAT_SRC,
82 .hooknum = NF_BR_PRE_ROUTING,
83 .priority = NF_BR_PRI_NAT_DST_BRIDGED,
87 static int __net_init frame_nat_net_init(struct net *net)
89 return ebt_register_table(net, &frame_nat, ebt_ops_nat,
93 static void __net_exit frame_nat_net_exit(struct net *net)
95 ebt_unregister_table(net, net->xt.frame_nat, ebt_ops_nat);
98 static struct pernet_operations frame_nat_net_ops = {
99 .init = frame_nat_net_init,
100 .exit = frame_nat_net_exit,
103 static int __init ebtable_nat_init(void)
105 return register_pernet_subsys(&frame_nat_net_ops);
108 static void __exit ebtable_nat_fini(void)
110 unregister_pernet_subsys(&frame_nat_net_ops);
113 module_init(ebtable_nat_init);
114 module_exit(ebtable_nat_fini);
115 MODULE_LICENSE("GPL");