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(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);
67 ebt_nat_out(void *priv, struct sk_buff *skb,
68 const struct nf_hook_state *state)
70 return ebt_do_table(skb, state, state->net->xt.frame_nat);
73 static struct nf_hook_ops ebt_ops_nat[] __read_mostly = {
77 .hooknum = NF_BR_LOCAL_OUT,
78 .priority = NF_BR_PRI_NAT_DST_OTHER,
83 .hooknum = NF_BR_POST_ROUTING,
84 .priority = NF_BR_PRI_NAT_SRC,
89 .hooknum = NF_BR_PRE_ROUTING,
90 .priority = NF_BR_PRI_NAT_DST_BRIDGED,
94 static int __net_init frame_nat_net_init(struct net *net)
96 net->xt.frame_nat = ebt_register_table(net, &frame_nat);
97 return PTR_ERR_OR_ZERO(net->xt.frame_nat);
100 static void __net_exit frame_nat_net_exit(struct net *net)
102 ebt_unregister_table(net, net->xt.frame_nat);
105 static struct pernet_operations frame_nat_net_ops = {
106 .init = frame_nat_net_init,
107 .exit = frame_nat_net_exit,
110 static int __init ebtable_nat_init(void)
114 ret = register_pernet_subsys(&frame_nat_net_ops);
117 ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
119 unregister_pernet_subsys(&frame_nat_net_ops);
123 static void __exit ebtable_nat_fini(void)
125 nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
126 unregister_pernet_subsys(&frame_nat_net_ops);
129 module_init(ebtable_nat_init);
130 module_exit(ebtable_nat_fini);
131 MODULE_LICENSE("GPL");