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1da177e4 LT |
1 | /* |
2 | * ebtable_nat | |
3 | * | |
4 | * Authors: | |
5 | * Bart De Schuymer <bdschuym@pandora.be> | |
6 | * | |
7 | * April, 2002 | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/netfilter_bridge/ebtables.h> | |
12 | #include <linux/module.h> | |
13 | ||
14 | #define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \ | |
15 | (1 << NF_BR_POST_ROUTING)) | |
16 | ||
97ad8b53 | 17 | static struct ebt_entries initial_chains[] = { |
1da177e4 LT |
18 | { |
19 | .name = "PREROUTING", | |
20 | .policy = EBT_ACCEPT, | |
21 | }, | |
22 | { | |
23 | .name = "OUTPUT", | |
24 | .policy = EBT_ACCEPT, | |
25 | }, | |
26 | { | |
27 | .name = "POSTROUTING", | |
28 | .policy = EBT_ACCEPT, | |
29 | } | |
30 | }; | |
31 | ||
97ad8b53 | 32 | static struct ebt_replace_kernel initial_table = { |
1da177e4 LT |
33 | .name = "nat", |
34 | .valid_hooks = NAT_VALID_HOOKS, | |
35 | .entries_size = 3 * sizeof(struct ebt_entries), | |
36 | .hook_entry = { | |
37 | [NF_BR_PRE_ROUTING] = &initial_chains[0], | |
38 | [NF_BR_LOCAL_OUT] = &initial_chains[1], | |
39 | [NF_BR_POST_ROUTING] = &initial_chains[2], | |
40 | }, | |
41 | .entries = (char *)initial_chains, | |
42 | }; | |
43 | ||
44 | static int check(const struct ebt_table_info *info, unsigned int valid_hooks) | |
45 | { | |
46 | if (valid_hooks & ~NAT_VALID_HOOKS) | |
47 | return -EINVAL; | |
48 | return 0; | |
49 | } | |
50 | ||
97ad8b53 | 51 | static struct ebt_table frame_nat = { |
1da177e4 LT |
52 | .name = "nat", |
53 | .table = &initial_table, | |
54 | .valid_hooks = NAT_VALID_HOOKS, | |
1da177e4 LT |
55 | .check = check, |
56 | .me = THIS_MODULE, | |
57 | }; | |
58 | ||
59 | static unsigned int | |
06198b34 | 60 | ebt_nat_in(void *priv, struct sk_buff *skb, |
238e54c9 | 61 | const struct nf_hook_state *state) |
1da177e4 | 62 | { |
97b59c3a | 63 | return ebt_do_table(skb, state, state->net->xt.frame_nat); |
1da177e4 LT |
64 | } |
65 | ||
66 | static unsigned int | |
06198b34 | 67 | ebt_nat_out(void *priv, struct sk_buff *skb, |
238e54c9 | 68 | const struct nf_hook_state *state) |
1da177e4 | 69 | { |
97b59c3a | 70 | return ebt_do_table(skb, state, state->net->xt.frame_nat); |
1da177e4 LT |
71 | } |
72 | ||
1999414a | 73 | static struct nf_hook_ops ebt_ops_nat[] __read_mostly = { |
1da177e4 | 74 | { |
b71b30a6 | 75 | .hook = ebt_nat_out, |
1da177e4 | 76 | .owner = THIS_MODULE, |
24c232d8 | 77 | .pf = NFPROTO_BRIDGE, |
1da177e4 LT |
78 | .hooknum = NF_BR_LOCAL_OUT, |
79 | .priority = NF_BR_PRI_NAT_DST_OTHER, | |
80 | }, | |
81 | { | |
b71b30a6 | 82 | .hook = ebt_nat_out, |
1da177e4 | 83 | .owner = THIS_MODULE, |
24c232d8 | 84 | .pf = NFPROTO_BRIDGE, |
1da177e4 LT |
85 | .hooknum = NF_BR_POST_ROUTING, |
86 | .priority = NF_BR_PRI_NAT_SRC, | |
87 | }, | |
88 | { | |
b71b30a6 | 89 | .hook = ebt_nat_in, |
1da177e4 | 90 | .owner = THIS_MODULE, |
24c232d8 | 91 | .pf = NFPROTO_BRIDGE, |
1da177e4 LT |
92 | .hooknum = NF_BR_PRE_ROUTING, |
93 | .priority = NF_BR_PRI_NAT_DST_BRIDGED, | |
94 | }, | |
95 | }; | |
96 | ||
b71b30a6 AD |
97 | static int __net_init frame_nat_net_init(struct net *net) |
98 | { | |
99 | net->xt.frame_nat = ebt_register_table(net, &frame_nat); | |
8c6ffba0 | 100 | return PTR_ERR_OR_ZERO(net->xt.frame_nat); |
b71b30a6 AD |
101 | } |
102 | ||
103 | static void __net_exit frame_nat_net_exit(struct net *net) | |
104 | { | |
f54e9367 | 105 | ebt_unregister_table(net, net->xt.frame_nat); |
b71b30a6 AD |
106 | } |
107 | ||
108 | static struct pernet_operations frame_nat_net_ops = { | |
109 | .init = frame_nat_net_init, | |
110 | .exit = frame_nat_net_exit, | |
111 | }; | |
112 | ||
65b4b4e8 | 113 | static int __init ebtable_nat_init(void) |
1da177e4 | 114 | { |
e40f51a3 | 115 | int ret; |
1da177e4 | 116 | |
b71b30a6 AD |
117 | ret = register_pernet_subsys(&frame_nat_net_ops); |
118 | if (ret < 0) | |
119 | return ret; | |
e40f51a3 AD |
120 | ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat)); |
121 | if (ret < 0) | |
b71b30a6 | 122 | unregister_pernet_subsys(&frame_nat_net_ops); |
1da177e4 LT |
123 | return ret; |
124 | } | |
125 | ||
65b4b4e8 | 126 | static void __exit ebtable_nat_fini(void) |
1da177e4 | 127 | { |
e40f51a3 | 128 | nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat)); |
b71b30a6 | 129 | unregister_pernet_subsys(&frame_nat_net_ops); |
1da177e4 LT |
130 | } |
131 | ||
65b4b4e8 AM |
132 | module_init(ebtable_nat_init); |
133 | module_exit(ebtable_nat_fini); | |
1da177e4 | 134 | MODULE_LICENSE("GPL"); |