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 const struct ebt_table frame_filter =
56 .table = &initial_table,
57 .valid_hooks = FILTER_VALID_HOOKS,
63 ebt_in_hook(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_filter);
70 ebt_out_hook(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_filter);
76 static struct nf_hook_ops ebt_ops_filter[] __read_mostly = {
81 .hooknum = NF_BR_LOCAL_IN,
82 .priority = NF_BR_PRI_FILTER_BRIDGED,
88 .hooknum = NF_BR_FORWARD,
89 .priority = NF_BR_PRI_FILTER_BRIDGED,
95 .hooknum = NF_BR_LOCAL_OUT,
96 .priority = NF_BR_PRI_FILTER_OTHER,
100 static int __net_init frame_filter_net_init(struct net *net)
102 net->xt.frame_filter = ebt_register_table(net, &frame_filter);
103 return PTR_ERR_OR_ZERO(net->xt.frame_filter);
106 static void __net_exit frame_filter_net_exit(struct net *net)
108 ebt_unregister_table(net, net->xt.frame_filter);
111 static struct pernet_operations frame_filter_net_ops = {
112 .init = frame_filter_net_init,
113 .exit = frame_filter_net_exit,
116 static int __init ebtable_filter_init(void)
120 ret = register_pernet_subsys(&frame_filter_net_ops);
123 ret = nf_register_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
125 unregister_pernet_subsys(&frame_filter_net_ops);
129 static void __exit ebtable_filter_fini(void)
131 nf_unregister_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
132 unregister_pernet_subsys(&frame_filter_net_ops);
135 module_init(ebtable_filter_init);
136 module_exit(ebtable_filter_fini);
137 MODULE_LICENSE("GPL");