Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ebt_redirect |
| 3 | * |
| 4 | * Authors: |
| 5 | * Bart De Schuymer <bdschuym@pandora.be> |
| 6 | * |
| 7 | * April, 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> |
| 12 | #include "../br_private.h" |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
Jan Engelhardt | 0ac6ab1 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 18 | static unsigned int ebt_target_redirect(struct sk_buff *skb, |
| 19 | unsigned int hooknr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | const struct net_device *in, const struct net_device *out, |
| 21 | const void *data, unsigned int datalen) |
| 22 | { |
Jan Engelhardt | abfdf1c | 2008-01-31 03:59:24 -0800 | [diff] [blame] | 23 | const struct ebt_redirect_info *info = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Joonwoo Park | eb1197b | 2008-02-19 17:18:47 -0800 | [diff] [blame] | 25 | if (!skb_make_writable(skb, 0)) |
Joonwoo Park | 1b04ab4 | 2008-02-23 20:22:27 -0800 | [diff] [blame] | 26 | return EBT_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | if (hooknr != NF_BR_BROUTING) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 29 | memcpy(eth_hdr(skb)->h_dest, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | in->br_port->br->dev->dev_addr, ETH_ALEN); |
| 31 | else |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 32 | memcpy(eth_hdr(skb)->h_dest, in->dev_addr, ETH_ALEN); |
| 33 | skb->pkt_type = PACKET_HOST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | return info->target; |
| 35 | } |
| 36 | |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 37 | static bool ebt_target_redirect_check(const char *tablename, unsigned int hookmask, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | const struct ebt_entry *e, void *data, unsigned int datalen) |
| 39 | { |
Jan Engelhardt | abfdf1c | 2008-01-31 03:59:24 -0800 | [diff] [blame] | 40 | const struct ebt_redirect_info *info = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | if (BASE_CHAIN && info->target == EBT_RETURN) |
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 | CLEAR_BASE_CHAIN_BIT; |
| 45 | if ( (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) && |
| 46 | (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) ) |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 47 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | if (INVALID_TARGET) |
Jan Engelhardt | 19eda87 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 49 | return false; |
| 50 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | } |
| 52 | |
Jan Engelhardt | 30083c9 | 2008-01-31 04:00:59 -0800 | [diff] [blame] | 53 | static struct ebt_target redirect_target __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | .name = EBT_REDIRECT_TARGET, |
Jan Engelhardt | 001a18d | 2008-10-08 11:35:14 +0200 | [diff] [blame^] | 55 | .revision = 0, |
| 56 | .family = NFPROTO_BRIDGE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | .target = ebt_target_redirect, |
| 58 | .check = ebt_target_redirect_check, |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 59 | .targetsize = XT_ALIGN(sizeof(struct ebt_redirect_info)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | .me = THIS_MODULE, |
| 61 | }; |
| 62 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 63 | static int __init ebt_redirect_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | { |
| 65 | return ebt_register_target(&redirect_target); |
| 66 | } |
| 67 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 68 | static void __exit ebt_redirect_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | { |
| 70 | ebt_unregister_target(&redirect_target); |
| 71 | } |
| 72 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 73 | module_init(ebt_redirect_init); |
| 74 | module_exit(ebt_redirect_fini); |
Jan Engelhardt | f776c4c | 2008-01-31 04:00:30 -0800 | [diff] [blame] | 75 | MODULE_DESCRIPTION("Ebtables: Packet redirection to localhost"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | MODULE_LICENSE("GPL"); |