5 * Bart De Schuymer <bdschuym@pandora.be>
9 * This table lets you choose between routing and bridging for frames
10 * entering on a bridge enslaved nic. This table is traversed before any
11 * other ebtables table. See net/bridge/br_input.c.
14 #include <linux/netfilter_bridge/ebtables.h>
15 #include <linux/module.h>
16 #include <linux/if_bridge.h>
18 /* EBT_ACCEPT means the frame will be bridged
19 * EBT_DROP means the frame will be routed
21 static struct ebt_entries initial_chain = {
26 static struct ebt_replace_kernel initial_table = {
28 .valid_hooks = 1 << NF_BR_BROUTING,
29 .entries_size = sizeof(struct ebt_entries),
31 [NF_BR_BROUTING] = &initial_chain,
33 .entries = (char *)&initial_chain,
36 static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
38 if (valid_hooks & ~(1 << NF_BR_BROUTING))
43 static const struct ebt_table broute_table = {
45 .table = &initial_table,
46 .valid_hooks = 1 << NF_BR_BROUTING,
51 static int ebt_broute(struct sk_buff *skb)
53 struct nf_hook_state state;
56 nf_hook_state_init(&state, NULL, NF_BR_BROUTING, INT_MIN,
57 NFPROTO_BRIDGE, skb->dev, NULL, NULL,
58 dev_net(skb->dev), NULL);
60 ret = ebt_do_table(skb, &state, state.net->xt.broute_table);
62 return 1; /* route it */
63 return 0; /* bridge it */
66 static int __net_init broute_net_init(struct net *net)
68 net->xt.broute_table = ebt_register_table(net, &broute_table);
69 return PTR_ERR_OR_ZERO(net->xt.broute_table);
72 static void __net_exit broute_net_exit(struct net *net)
74 ebt_unregister_table(net, net->xt.broute_table);
77 static struct pernet_operations broute_net_ops = {
78 .init = broute_net_init,
79 .exit = broute_net_exit,
82 static int __init ebtable_broute_init(void)
86 ret = register_pernet_subsys(&broute_net_ops);
90 RCU_INIT_POINTER(br_should_route_hook,
91 (br_should_route_hook_t *)ebt_broute);
95 static void __exit ebtable_broute_fini(void)
97 RCU_INIT_POINTER(br_should_route_hook, NULL);
99 unregister_pernet_subsys(&broute_net_ops);
102 module_init(ebtable_broute_init);
103 module_exit(ebtable_broute_fini);
104 MODULE_LICENSE("GPL");