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
,
63 ebt_nat_in(unsigned int hook
, struct sk_buff
*skb
, const struct net_device
*in
64 , const struct net_device
*out
, int (*okfn
)(struct sk_buff
*))
66 return ebt_do_table(hook
, skb
, in
, out
, dev_net(in
)->xt
.frame_nat
);
70 ebt_nat_out(unsigned int hook
, struct sk_buff
*skb
, const struct net_device
*in
71 , const struct net_device
*out
, int (*okfn
)(struct sk_buff
*))
73 return ebt_do_table(hook
, skb
, in
, out
, dev_net(out
)->xt
.frame_nat
);
76 static struct nf_hook_ops ebt_ops_nat
[] __read_mostly
= {
81 .hooknum
= NF_BR_LOCAL_OUT
,
82 .priority
= NF_BR_PRI_NAT_DST_OTHER
,
88 .hooknum
= NF_BR_POST_ROUTING
,
89 .priority
= NF_BR_PRI_NAT_SRC
,
95 .hooknum
= NF_BR_PRE_ROUTING
,
96 .priority
= NF_BR_PRI_NAT_DST_BRIDGED
,
100 static int __net_init
frame_nat_net_init(struct net
*net
)
102 net
->xt
.frame_nat
= ebt_register_table(net
, &frame_nat
);
103 return PTR_ERR_OR_ZERO(net
->xt
.frame_nat
);
106 static void __net_exit
frame_nat_net_exit(struct net
*net
)
108 ebt_unregister_table(net
, net
->xt
.frame_nat
);
111 static struct pernet_operations frame_nat_net_ops
= {
112 .init
= frame_nat_net_init
,
113 .exit
= frame_nat_net_exit
,
116 static int __init
ebtable_nat_init(void)
120 ret
= register_pernet_subsys(&frame_nat_net_ops
);
123 ret
= nf_register_hooks(ebt_ops_nat
, ARRAY_SIZE(ebt_ops_nat
));
125 unregister_pernet_subsys(&frame_nat_net_ops
);
129 static void __exit
ebtable_nat_fini(void)
131 nf_unregister_hooks(ebt_ops_nat
, ARRAY_SIZE(ebt_ops_nat
));
132 unregister_pernet_subsys(&frame_nat_net_ops
);
135 module_init(ebtable_nat_init
);
136 module_exit(ebtable_nat_fini
);
137 MODULE_LICENSE("GPL");