Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ebt_dnat |
| 3 | * |
| 4 | * Authors: |
| 5 | * Bart De Schuymer <bdschuym@pandora.be> |
| 6 | * |
| 7 | * June, 2002 |
| 8 | * |
| 9 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/module.h> |
| 11 | #include <net/sock.h> |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 12 | #include <linux/netfilter.h> |
| 13 | #include <linux/netfilter/x_tables.h> |
| 14 | #include <linux/netfilter_bridge/ebtables.h> |
| 15 | #include <linux/netfilter_bridge/ebt_nat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Jan Engelhardt | 2d06d4a | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 17 | static unsigned int |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 18 | ebt_dnat_tg(struct sk_buff *skb, const struct xt_target_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | { |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 20 | const struct ebt_nat_info *info = par->targinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
Joonwoo Park | eb1197b | 2008-02-19 17:18:47 -0800 | [diff] [blame] | 22 | if (!skb_make_writable(skb, 0)) |
Joonwoo Park | 1b04ab4 | 2008-02-23 20:22:27 -0800 | [diff] [blame] | 23 | return EBT_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 25 | memcpy(eth_hdr(skb)->h_dest, info->mac, ETH_ALEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | return info->target; |
| 27 | } |
| 28 | |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 29 | static bool ebt_dnat_tg_check(const struct xt_tgchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | { |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 31 | const struct ebt_nat_info *info = par->targinfo; |
| 32 | unsigned int hook_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | if (BASE_CHAIN && info->target == EBT_RETURN) |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 35 | return false; |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 36 | |
| 37 | hook_mask = par->hook_mask & ~(1 << NF_BR_NUMHOOKS); |
| 38 | if ((strcmp(par->table, "nat") != 0 || |
| 39 | (hook_mask & ~((1 << NF_BR_PRE_ROUTING) | |
| 40 | (1 << NF_BR_LOCAL_OUT)))) && |
| 41 | (strcmp(par->table, "broute") != 0 || |
| 42 | hook_mask & ~(1 << NF_BR_BROUTING))) |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 43 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | if (INVALID_TARGET) |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 45 | return false; |
| 46 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | } |
| 48 | |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 49 | static struct xt_target ebt_dnat_tg_reg __read_mostly = { |
| 50 | .name = "dnat", |
Jan Engelhardt | 001a18d | 2008-10-08 11:35:14 +0200 | [diff] [blame] | 51 | .revision = 0, |
| 52 | .family = NFPROTO_BRIDGE, |
Jan Engelhardt | f2ff525 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 53 | .hooks = (1 << NF_BR_NUMHOOKS) | (1 << NF_BR_PRE_ROUTING) | |
| 54 | (1 << NF_BR_LOCAL_OUT) | (1 << NF_BR_BROUTING), |
Jan Engelhardt | 2d06d4a | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 55 | .target = ebt_dnat_tg, |
| 56 | .checkentry = ebt_dnat_tg_check, |
Florian Westphal | fc0e3df | 2010-02-15 18:16:26 +0100 | [diff] [blame] | 57 | .targetsize = sizeof(struct ebt_nat_info), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | .me = THIS_MODULE, |
| 59 | }; |
| 60 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 61 | static int __init ebt_dnat_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | { |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 63 | return xt_register_target(&ebt_dnat_tg_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | } |
| 65 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 66 | static void __exit ebt_dnat_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | { |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 68 | xt_unregister_target(&ebt_dnat_tg_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | } |
| 70 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 71 | module_init(ebt_dnat_init); |
| 72 | module_exit(ebt_dnat_fini); |
Jan Engelhardt | f776c4c | 2008-01-31 04:00:30 -0800 | [diff] [blame] | 73 | MODULE_DESCRIPTION("Ebtables: Destination MAC address translation"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | MODULE_LICENSE("GPL"); |