1 /*
2 * ebt_redirect
3 *
4 * Authors:
5 * Bart De Schuymer <bdschuym@pandora.be>
6 *
7 * April, 2002
8 *
9 */
10 #include <linux/module.h>
11 #include <net/sock.h>
12 #include "../br_private.h"
13 #include <linux/netfilter.h>
14 #include <linux/netfilter/x_tables.h>
15 #include <linux/netfilter_bridge/ebtables.h>
16 #include <linux/netfilter_bridge/ebt_redirect.h>
17
18 static unsigned int
19 ebt_redirect_tg(struct sk_buff *skb, const struct xt_target_param *par)
20 {
21 const struct ebt_redirect_info *info = par->targinfo;
22
23 if (!skb_make_writable(skb, 0))
24 return EBT_DROP;
25
26 if (par->hooknum != NF_BR_BROUTING)
27 memcpy(eth_hdr(skb)->h_dest,
28 par->in->br_port->br->dev->dev_addr, ETH_ALEN);
29 else
30 memcpy(eth_hdr(skb)->h_dest, par->in->dev_addr, ETH_ALEN);
31 skb->pkt_type = PACKET_HOST;
32 return info->target;
33 }
34
35 static bool ebt_redirect_tg_check(const struct xt_tgchk_param *par)
36 {
37 const struct ebt_redirect_info *info = par->targinfo;
38 unsigned int hook_mask;
39
40 if (BASE_CHAIN && info->target == EBT_RETURN)
41 return false;
42
43 hook_mask = par->hook_mask & ~(1 << NF_BR_NUMHOOKS);
44 if ((strcmp(par->table, "nat") != 0 ||
45 hook_mask & ~(1 << NF_BR_PRE_ROUTING)) &&
46 (strcmp(par->table, "broute") != 0 ||
47 hook_mask & ~(1 << NF_BR_BROUTING)))
48 return false;
49 if (INVALID_TARGET)
50 return false;
51 return true;
52 }
53
54 static struct xt_target ebt_redirect_tg_reg __read_mostly = {
55 .name = "redirect",
56 .revision = 0,
57 .family = NFPROTO_BRIDGE,
58 .hooks = (1 << NF_BR_NUMHOOKS) | (1 << NF_BR_PRE_ROUTING) |
59 (1 << NF_BR_BROUTING),
60 .target = ebt_redirect_tg,
61 .checkentry = ebt_redirect_tg_check,
62 .targetsize = XT_ALIGN(sizeof(struct ebt_redirect_info)),
63 .me = THIS_MODULE,
64 };
65
66 static int __init ebt_redirect_init(void)
67 {
68 return xt_register_target(&ebt_redirect_tg_reg);
69 }
70
71 static void __exit ebt_redirect_fini(void)
72 {
73 xt_unregister_target(&ebt_redirect_tg_reg);
74 }
75
76 module_init(ebt_redirect_init);
77 module_exit(ebt_redirect_fini);
78 MODULE_DESCRIPTION("Ebtables: Packet redirection to localhost");
79 MODULE_LICENSE("GPL");
80
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