Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * ebt_redirect | |
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/netfilter_bridge/ebt_redirect.h> | |
13 | #include <linux/module.h> | |
14 | #include <net/sock.h> | |
15 | #include "../br_private.h" | |
16 | ||
17 | static int ebt_target_redirect(struct sk_buff **pskb, unsigned int hooknr, | |
18 | const struct net_device *in, const struct net_device *out, | |
19 | const void *data, unsigned int datalen) | |
20 | { | |
21 | struct ebt_redirect_info *info = (struct ebt_redirect_info *)data; | |
22 | ||
23 | if (skb_shared(*pskb) || skb_cloned(*pskb)) { | |
24 | struct sk_buff *nskb; | |
25 | ||
26 | nskb = skb_copy(*pskb, GFP_ATOMIC); | |
27 | if (!nskb) | |
28 | return NF_DROP; | |
29 | if ((*pskb)->sk) | |
30 | skb_set_owner_w(nskb, (*pskb)->sk); | |
31 | kfree_skb(*pskb); | |
32 | *pskb = nskb; | |
33 | } | |
34 | if (hooknr != NF_BR_BROUTING) | |
35 | memcpy(eth_hdr(*pskb)->h_dest, | |
36 | in->br_port->br->dev->dev_addr, ETH_ALEN); | |
37 | else | |
38 | memcpy(eth_hdr(*pskb)->h_dest, in->dev_addr, ETH_ALEN); | |
39 | (*pskb)->pkt_type = PACKET_HOST; | |
40 | return info->target; | |
41 | } | |
42 | ||
43 | static int ebt_target_redirect_check(const char *tablename, unsigned int hookmask, | |
44 | const struct ebt_entry *e, void *data, unsigned int datalen) | |
45 | { | |
46 | struct ebt_redirect_info *info = (struct ebt_redirect_info *)data; | |
47 | ||
48 | if (datalen != EBT_ALIGN(sizeof(struct ebt_redirect_info))) | |
49 | return -EINVAL; | |
50 | if (BASE_CHAIN && info->target == EBT_RETURN) | |
51 | return -EINVAL; | |
52 | CLEAR_BASE_CHAIN_BIT; | |
53 | if ( (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) && | |
54 | (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) ) | |
55 | return -EINVAL; | |
56 | if (INVALID_TARGET) | |
57 | return -EINVAL; | |
58 | return 0; | |
59 | } | |
60 | ||
61 | static struct ebt_target redirect_target = | |
62 | { | |
63 | .name = EBT_REDIRECT_TARGET, | |
64 | .target = ebt_target_redirect, | |
65 | .check = ebt_target_redirect_check, | |
66 | .me = THIS_MODULE, | |
67 | }; | |
68 | ||
65b4b4e8 | 69 | static int __init ebt_redirect_init(void) |
1da177e4 LT |
70 | { |
71 | return ebt_register_target(&redirect_target); | |
72 | } | |
73 | ||
65b4b4e8 | 74 | static void __exit ebt_redirect_fini(void) |
1da177e4 LT |
75 | { |
76 | ebt_unregister_target(&redirect_target); | |
77 | } | |
78 | ||
65b4b4e8 AM |
79 | module_init(ebt_redirect_init); |
80 | module_exit(ebt_redirect_fini); | |
1da177e4 | 81 | MODULE_LICENSE("GPL"); |