1 /*
2 * ebtable_broute
3 *
4 * Authors:
5 * Bart De Schuymer <bdschuym@pandora.be>
6 *
7 * April, 2002
8 *
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.
12 */
13
14 #include <linux/netfilter_bridge/ebtables.h>
15 #include <linux/module.h>
16 #include <linux/if_bridge.h>
17
18 /* EBT_ACCEPT means the frame will be bridged
19 * EBT_DROP means the frame will be routed
20 */
21 static struct ebt_entries initial_chain = {
22 .name = "BROUTING",
23 .policy = EBT_ACCEPT,
24 };
25
26 static struct ebt_replace_kernel initial_table =
27 {
28 .name = "broute",
29 .valid_hooks = 1 << NF_BR_BROUTING,
30 .entries_size = sizeof(struct ebt_entries),
31 .hook_entry = {
32 [NF_BR_BROUTING] = &initial_chain,
33 },
34 .entries = (char *)&initial_chain,
35 };
36
37 static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
38 {
39 if (valid_hooks & ~(1 << NF_BR_BROUTING))
40 return -EINVAL;
41 return 0;
42 }
43
44 static struct ebt_table broute_table =
45 {
46 .name = "broute",
47 .table = &initial_table,
48 .valid_hooks = 1 << NF_BR_BROUTING,
49 .lock = RW_LOCK_UNLOCKED,
50 .check = check,
51 .me = THIS_MODULE,
52 };
53
54 static int ebt_broute(struct sk_buff *skb)
55 {
56 int ret;
57
58 ret = ebt_do_table(NF_BR_BROUTING, skb, skb->dev, NULL,
59 &broute_table);
60 if (ret == NF_DROP)
61 return 1; /* route it */
62 return 0; /* bridge it */
63 }
64
65 static int __init ebtable_broute_init(void)
66 {
67 int ret;
68
69 ret = ebt_register_table(&broute_table);
70 if (ret < 0)
71 return ret;
72 /* see br_input.c */
73 rcu_assign_pointer(br_should_route_hook, ebt_broute);
74 return ret;
75 }
76
77 static void __exit ebtable_broute_fini(void)
78 {
79 rcu_assign_pointer(br_should_route_hook, NULL);
80 synchronize_net();
81 ebt_unregister_table(&broute_table);
82 }
83
84 module_init(ebtable_broute_init);
85 module_exit(ebtable_broute_fini);
86 MODULE_LICENSE("GPL");
87
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