5 * Bart De Schuymer <bdschuym@pandora.be>
11 #include <linux/netfilter_bridge/ebtables.h>
12 #include <uapi/linux/netfilter_bridge.h>
13 #include <linux/module.h>
15 #define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
16 (1 << NF_BR_LOCAL_OUT))
18 static struct ebt_entries initial_chains[] = {
33 static struct ebt_replace_kernel initial_table = {
35 .valid_hooks = FILTER_VALID_HOOKS,
36 .entries_size = 3 * sizeof(struct ebt_entries),
38 [NF_BR_LOCAL_IN] = &initial_chains[0],
39 [NF_BR_FORWARD] = &initial_chains[1],
40 [NF_BR_LOCAL_OUT] = &initial_chains[2],
42 .entries = (char *)initial_chains,
45 static const struct ebt_table frame_filter = {
47 .table = &initial_table,
48 .valid_hooks = FILTER_VALID_HOOKS,
53 ebt_in_hook(void *priv, struct sk_buff *skb,
54 const struct nf_hook_state *state)
56 return ebt_do_table(skb, state, state->net->xt.frame_filter);
60 ebt_out_hook(void *priv, struct sk_buff *skb,
61 const struct nf_hook_state *state)
63 return ebt_do_table(skb, state, state->net->xt.frame_filter);
66 static const struct nf_hook_ops ebt_ops_filter[] = {
70 .hooknum = NF_BR_LOCAL_IN,
71 .priority = NF_BR_PRI_FILTER_BRIDGED,
76 .hooknum = NF_BR_FORWARD,
77 .priority = NF_BR_PRI_FILTER_BRIDGED,
82 .hooknum = NF_BR_LOCAL_OUT,
83 .priority = NF_BR_PRI_FILTER_OTHER,
87 static int __net_init frame_filter_net_init(struct net *net)
89 return ebt_register_table(net, &frame_filter, ebt_ops_filter,
90 &net->xt.frame_filter);
93 static void __net_exit frame_filter_net_exit(struct net *net)
95 ebt_unregister_table(net, net->xt.frame_filter, ebt_ops_filter);
98 static struct pernet_operations frame_filter_net_ops = {
99 .init = frame_filter_net_init,
100 .exit = frame_filter_net_exit,
103 static int __init ebtable_filter_init(void)
105 return register_pernet_subsys(&frame_filter_net_ops);
108 static void __exit ebtable_filter_fini(void)
110 unregister_pernet_subsys(&frame_filter_net_ops);
113 module_init(ebtable_filter_init);
114 module_exit(ebtable_filter_fini);
115 MODULE_LICENSE("GPL");