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");