5 * Bart De Schuymer <bdschuym@pandora.be>
11 #include <linux/netfilter_bridge/ebtables.h>
12 #include <linux/module.h>
14 #define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
15 (1 << NF_BR_LOCAL_OUT))
17 static struct ebt_entries initial_chains
[] =
33 static struct ebt_replace_kernel initial_table
=
36 .valid_hooks
= FILTER_VALID_HOOKS
,
37 .entries_size
= 3 * sizeof(struct ebt_entries
),
39 [NF_BR_LOCAL_IN
] = &initial_chains
[0],
40 [NF_BR_FORWARD
] = &initial_chains
[1],
41 [NF_BR_LOCAL_OUT
] = &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
& ~FILTER_VALID_HOOKS
)
53 static struct ebt_table frame_filter
=
56 .table
= &initial_table
,
57 .valid_hooks
= FILTER_VALID_HOOKS
,
58 .lock
= __RW_LOCK_UNLOCKED(frame_filter
.lock
),
64 ebt_in_hook(unsigned int hook
, struct sk_buff
*skb
, const struct net_device
*in
,
65 const struct net_device
*out
, int (*okfn
)(struct sk_buff
*))
67 return ebt_do_table(hook
, skb
, in
, out
, dev_net(in
)->xt
.frame_filter
);
71 ebt_out_hook(unsigned int hook
, struct sk_buff
*skb
, const struct net_device
*in
,
72 const struct net_device
*out
, int (*okfn
)(struct sk_buff
*))
74 return ebt_do_table(hook
, skb
, in
, out
, dev_net(out
)->xt
.frame_filter
);
77 static struct nf_hook_ops ebt_ops_filter
[] __read_mostly
= {
82 .hooknum
= NF_BR_LOCAL_IN
,
83 .priority
= NF_BR_PRI_FILTER_BRIDGED
,
89 .hooknum
= NF_BR_FORWARD
,
90 .priority
= NF_BR_PRI_FILTER_BRIDGED
,
96 .hooknum
= NF_BR_LOCAL_OUT
,
97 .priority
= NF_BR_PRI_FILTER_OTHER
,
101 static int __net_init
frame_filter_net_init(struct net
*net
)
103 net
->xt
.frame_filter
= ebt_register_table(net
, &frame_filter
);
104 if (IS_ERR(net
->xt
.frame_filter
))
105 return PTR_ERR(net
->xt
.frame_filter
);
109 static void __net_exit
frame_filter_net_exit(struct net
*net
)
111 ebt_unregister_table(net
->xt
.frame_filter
);
114 static struct pernet_operations frame_filter_net_ops
= {
115 .init
= frame_filter_net_init
,
116 .exit
= frame_filter_net_exit
,
119 static int __init
ebtable_filter_init(void)
123 ret
= register_pernet_subsys(&frame_filter_net_ops
);
126 ret
= nf_register_hooks(ebt_ops_filter
, ARRAY_SIZE(ebt_ops_filter
));
128 unregister_pernet_subsys(&frame_filter_net_ops
);
132 static void __exit
ebtable_filter_fini(void)
134 nf_unregister_hooks(ebt_ops_filter
, ARRAY_SIZE(ebt_ops_filter
));
135 unregister_pernet_subsys(&frame_filter_net_ops
);
138 module_init(ebtable_filter_init
);
139 module_exit(ebtable_filter_fini
);
140 MODULE_LICENSE("GPL");