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 nf_hook_state
*state
)
63 return ebt_do_table(ops
->hooknum
, skb
, state
->in
, state
->out
,
64 dev_net(state
->in
)->xt
.frame_nat
);
68 ebt_nat_out(const struct nf_hook_ops
*ops
, struct sk_buff
*skb
,
69 const struct nf_hook_state
*state
)
71 return ebt_do_table(ops
->hooknum
, skb
, state
->in
, state
->out
,
72 dev_net(state
->out
)->xt
.frame_nat
);
75 static struct nf_hook_ops ebt_ops_nat
[] __read_mostly
= {
80 .hooknum
= NF_BR_LOCAL_OUT
,
81 .priority
= NF_BR_PRI_NAT_DST_OTHER
,
87 .hooknum
= NF_BR_POST_ROUTING
,
88 .priority
= NF_BR_PRI_NAT_SRC
,
94 .hooknum
= NF_BR_PRE_ROUTING
,
95 .priority
= NF_BR_PRI_NAT_DST_BRIDGED
,
99 static int __net_init
frame_nat_net_init(struct net
*net
)
101 net
->xt
.frame_nat
= ebt_register_table(net
, &frame_nat
);
102 return PTR_ERR_OR_ZERO(net
->xt
.frame_nat
);
105 static void __net_exit
frame_nat_net_exit(struct net
*net
)
107 ebt_unregister_table(net
, net
->xt
.frame_nat
);
110 static struct pernet_operations frame_nat_net_ops
= {
111 .init
= frame_nat_net_init
,
112 .exit
= frame_nat_net_exit
,
115 static int __init
ebtable_nat_init(void)
119 ret
= register_pernet_subsys(&frame_nat_net_ops
);
122 ret
= nf_register_hooks(ebt_ops_nat
, ARRAY_SIZE(ebt_ops_nat
));
124 unregister_pernet_subsys(&frame_nat_net_ops
);
128 static void __exit
ebtable_nat_fini(void)
130 nf_unregister_hooks(ebt_ops_nat
, ARRAY_SIZE(ebt_ops_nat
));
131 unregister_pernet_subsys(&frame_nat_net_ops
);
134 module_init(ebtable_nat_init
);
135 module_exit(ebtable_nat_fini
);
136 MODULE_LICENSE("GPL");