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1da177e4 LT |
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 | ||
1e419cd9 | 26 | static struct ebt_replace_kernel initial_table = |
1da177e4 LT |
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 | ||
35aad0ff | 44 | static const struct ebt_table broute_table = |
1da177e4 LT |
45 | { |
46 | .name = "broute", | |
47 | .table = &initial_table, | |
48 | .valid_hooks = 1 << NF_BR_BROUTING, | |
1da177e4 LT |
49 | .check = check, |
50 | .me = THIS_MODULE, | |
51 | }; | |
52 | ||
3db05fea | 53 | static int ebt_broute(struct sk_buff *skb) |
1da177e4 LT |
54 | { |
55 | int ret; | |
56 | ||
3db05fea | 57 | ret = ebt_do_table(NF_BR_BROUTING, skb, skb->dev, NULL, |
8157e6d1 | 58 | dev_net(skb->dev)->xt.broute_table); |
1da177e4 LT |
59 | if (ret == NF_DROP) |
60 | return 1; /* route it */ | |
61 | return 0; /* bridge it */ | |
62 | } | |
63 | ||
8157e6d1 AD |
64 | static int __net_init broute_net_init(struct net *net) |
65 | { | |
66 | net->xt.broute_table = ebt_register_table(net, &broute_table); | |
67 | if (IS_ERR(net->xt.broute_table)) | |
68 | return PTR_ERR(net->xt.broute_table); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static void __net_exit broute_net_exit(struct net *net) | |
73 | { | |
f54e9367 | 74 | ebt_unregister_table(net, net->xt.broute_table); |
8157e6d1 AD |
75 | } |
76 | ||
77 | static struct pernet_operations broute_net_ops = { | |
78 | .init = broute_net_init, | |
79 | .exit = broute_net_exit, | |
80 | }; | |
81 | ||
65b4b4e8 | 82 | static int __init ebtable_broute_init(void) |
1da177e4 | 83 | { |
8157e6d1 AD |
84 | int ret; |
85 | ||
86 | ret = register_pernet_subsys(&broute_net_ops); | |
87 | if (ret < 0) | |
88 | return ret; | |
1da177e4 | 89 | /* see br_input.c */ |
a386f990 ED |
90 | rcu_assign_pointer(br_should_route_hook, |
91 | (br_should_route_hook_t *)ebt_broute); | |
6beceee5 | 92 | return 0; |
1da177e4 LT |
93 | } |
94 | ||
65b4b4e8 | 95 | static void __exit ebtable_broute_fini(void) |
1da177e4 | 96 | { |
82de382c | 97 | rcu_assign_pointer(br_should_route_hook, NULL); |
1da177e4 | 98 | synchronize_net(); |
8157e6d1 | 99 | unregister_pernet_subsys(&broute_net_ops); |
1da177e4 LT |
100 | } |
101 | ||
65b4b4e8 AM |
102 | module_init(ebtable_broute_init); |
103 | module_exit(ebtable_broute_fini); | |
1da177e4 | 104 | MODULE_LICENSE("GPL"); |