Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * ebt_dnat | |
3 | * | |
4 | * Authors: | |
5 | * Bart De Schuymer <bdschuym@pandora.be> | |
6 | * | |
7 | * June, 2002 | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/netfilter_bridge/ebtables.h> | |
12 | #include <linux/netfilter_bridge/ebt_nat.h> | |
13 | #include <linux/module.h> | |
14 | #include <net/sock.h> | |
15 | ||
16 | static int ebt_target_dnat(struct sk_buff **pskb, unsigned int hooknr, | |
17 | const struct net_device *in, const struct net_device *out, | |
18 | const void *data, unsigned int datalen) | |
19 | { | |
20 | struct ebt_nat_info *info = (struct ebt_nat_info *)data; | |
21 | ||
22 | if (skb_shared(*pskb) || skb_cloned(*pskb)) { | |
23 | struct sk_buff *nskb; | |
24 | ||
25 | nskb = skb_copy(*pskb, GFP_ATOMIC); | |
26 | if (!nskb) | |
27 | return NF_DROP; | |
28 | if ((*pskb)->sk) | |
29 | skb_set_owner_w(nskb, (*pskb)->sk); | |
30 | kfree_skb(*pskb); | |
31 | *pskb = nskb; | |
32 | } | |
33 | memcpy(eth_hdr(*pskb)->h_dest, info->mac, ETH_ALEN); | |
34 | return info->target; | |
35 | } | |
36 | ||
37 | static int ebt_target_dnat_check(const char *tablename, unsigned int hookmask, | |
38 | const struct ebt_entry *e, void *data, unsigned int datalen) | |
39 | { | |
40 | struct ebt_nat_info *info = (struct ebt_nat_info *)data; | |
41 | ||
42 | if (BASE_CHAIN && info->target == EBT_RETURN) | |
43 | return -EINVAL; | |
44 | CLEAR_BASE_CHAIN_BIT; | |
45 | if ( (strcmp(tablename, "nat") || | |
46 | (hookmask & ~((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT)))) && | |
47 | (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) ) | |
48 | return -EINVAL; | |
49 | if (datalen != EBT_ALIGN(sizeof(struct ebt_nat_info))) | |
50 | return -EINVAL; | |
51 | if (INVALID_TARGET) | |
52 | return -EINVAL; | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static struct ebt_target dnat = | |
57 | { | |
58 | .name = EBT_DNAT_TARGET, | |
59 | .target = ebt_target_dnat, | |
60 | .check = ebt_target_dnat_check, | |
61 | .me = THIS_MODULE, | |
62 | }; | |
63 | ||
65b4b4e8 | 64 | static int __init ebt_dnat_init(void) |
1da177e4 LT |
65 | { |
66 | return ebt_register_target(&dnat); | |
67 | } | |
68 | ||
65b4b4e8 | 69 | static void __exit ebt_dnat_fini(void) |
1da177e4 LT |
70 | { |
71 | ebt_unregister_target(&dnat); | |
72 | } | |
73 | ||
65b4b4e8 AM |
74 | module_init(ebt_dnat_init); |
75 | module_exit(ebt_dnat_fini); | |
1da177e4 | 76 | MODULE_LICENSE("GPL"); |