Commit | Line | Data |
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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 | ||
17 | static struct ebt_entries initial_chains[] = | |
18 | { | |
19 | { | |
20 | .name = "PREROUTING", | |
21 | .policy = EBT_ACCEPT, | |
22 | }, | |
23 | { | |
24 | .name = "OUTPUT", | |
25 | .policy = EBT_ACCEPT, | |
26 | }, | |
27 | { | |
28 | .name = "POSTROUTING", | |
29 | .policy = EBT_ACCEPT, | |
30 | } | |
31 | }; | |
32 | ||
1e419cd9 | 33 | static struct ebt_replace_kernel initial_table = |
1da177e4 LT |
34 | { |
35 | .name = "nat", | |
36 | .valid_hooks = NAT_VALID_HOOKS, | |
37 | .entries_size = 3 * sizeof(struct ebt_entries), | |
38 | .hook_entry = { | |
39 | [NF_BR_PRE_ROUTING] = &initial_chains[0], | |
40 | [NF_BR_LOCAL_OUT] = &initial_chains[1], | |
41 | [NF_BR_POST_ROUTING] = &initial_chains[2], | |
42 | }, | |
43 | .entries = (char *)initial_chains, | |
44 | }; | |
45 | ||
46 | static int check(const struct ebt_table_info *info, unsigned int valid_hooks) | |
47 | { | |
48 | if (valid_hooks & ~NAT_VALID_HOOKS) | |
49 | return -EINVAL; | |
50 | return 0; | |
51 | } | |
52 | ||
53 | static struct ebt_table frame_nat = | |
54 | { | |
55 | .name = "nat", | |
56 | .table = &initial_table, | |
57 | .valid_hooks = NAT_VALID_HOOKS, | |
0718300c | 58 | .lock = __RW_LOCK_UNLOCKED(frame_nat.lock), |
1da177e4 LT |
59 | .check = check, |
60 | .me = THIS_MODULE, | |
61 | }; | |
62 | ||
63 | static unsigned int | |
3db05fea | 64 | ebt_nat_dst(unsigned int hook, struct sk_buff *skb, const struct net_device *in |
1da177e4 LT |
65 | , const struct net_device *out, int (*okfn)(struct sk_buff *)) |
66 | { | |
3db05fea | 67 | return ebt_do_table(hook, skb, in, out, &frame_nat); |
1da177e4 LT |
68 | } |
69 | ||
70 | static unsigned int | |
3db05fea | 71 | ebt_nat_src(unsigned int hook, struct sk_buff *skb, const struct net_device *in |
1da177e4 LT |
72 | , const struct net_device *out, int (*okfn)(struct sk_buff *)) |
73 | { | |
3db05fea | 74 | return ebt_do_table(hook, skb, in, out, &frame_nat); |
1da177e4 LT |
75 | } |
76 | ||
1999414a | 77 | static struct nf_hook_ops ebt_ops_nat[] __read_mostly = { |
1da177e4 LT |
78 | { |
79 | .hook = ebt_nat_dst, | |
80 | .owner = THIS_MODULE, | |
81 | .pf = PF_BRIDGE, | |
82 | .hooknum = NF_BR_LOCAL_OUT, | |
83 | .priority = NF_BR_PRI_NAT_DST_OTHER, | |
84 | }, | |
85 | { | |
86 | .hook = ebt_nat_src, | |
87 | .owner = THIS_MODULE, | |
88 | .pf = PF_BRIDGE, | |
89 | .hooknum = NF_BR_POST_ROUTING, | |
90 | .priority = NF_BR_PRI_NAT_SRC, | |
91 | }, | |
92 | { | |
93 | .hook = ebt_nat_dst, | |
94 | .owner = THIS_MODULE, | |
95 | .pf = PF_BRIDGE, | |
96 | .hooknum = NF_BR_PRE_ROUTING, | |
97 | .priority = NF_BR_PRI_NAT_DST_BRIDGED, | |
98 | }, | |
99 | }; | |
100 | ||
65b4b4e8 | 101 | static int __init ebtable_nat_init(void) |
1da177e4 | 102 | { |
e40f51a3 | 103 | int ret; |
1da177e4 LT |
104 | |
105 | ret = ebt_register_table(&frame_nat); | |
106 | if (ret < 0) | |
107 | return ret; | |
e40f51a3 AD |
108 | ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat)); |
109 | if (ret < 0) | |
110 | ebt_unregister_table(&frame_nat); | |
1da177e4 LT |
111 | return ret; |
112 | } | |
113 | ||
65b4b4e8 | 114 | static void __exit ebtable_nat_fini(void) |
1da177e4 | 115 | { |
e40f51a3 | 116 | nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat)); |
1da177e4 LT |
117 | ebt_unregister_table(&frame_nat); |
118 | } | |
119 | ||
65b4b4e8 AM |
120 | module_init(ebtable_nat_init); |
121 | module_exit(ebtable_nat_fini); | |
1da177e4 | 122 | MODULE_LICENSE("GPL"); |