Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* This is a module which is used for setting up fake conntracks |
| 2 | * on packets so that they are not seen by the conntrack/NAT code. |
| 3 | */ |
| 4 | #include <linux/module.h> |
| 5 | #include <linux/skbuff.h> |
| 6 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 7 | #include <linux/netfilter/x_tables.h> |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 8 | #include <net/netfilter/nf_conntrack.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 10 | MODULE_LICENSE("GPL"); |
| 11 | MODULE_ALIAS("ipt_NOTRACK"); |
Jan Engelhardt | 73aaf93 | 2007-10-11 14:36:40 -0700 | [diff] [blame^] | 12 | MODULE_ALIAS("ip6t_NOTRACK"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | static unsigned int |
| 15 | target(struct sk_buff **pskb, |
| 16 | const struct net_device *in, |
| 17 | const struct net_device *out, |
| 18 | unsigned int hooknum, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame] | 19 | const struct xt_target *target, |
Patrick McHardy | fe1cb10 | 2006-08-22 00:35:47 -0700 | [diff] [blame] | 20 | const void *targinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | { |
| 22 | /* Previously seen (loopback)? Ignore. */ |
| 23 | if ((*pskb)->nfct != NULL) |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 24 | return XT_CONTINUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 26 | /* Attach fake conntrack entry. |
| 27 | If there is a real ct entry correspondig to this packet, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | it'll hang aroun till timing out. We don't deal with it |
| 29 | for performance reasons. JK */ |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 30 | (*pskb)->nfct = &nf_conntrack_untracked.ct_general; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | (*pskb)->nfctinfo = IP_CT_NEW; |
| 32 | nf_conntrack_get((*pskb)->nfct); |
| 33 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 34 | return XT_CONTINUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | } |
| 36 | |
Patrick McHardy | 9f15c53 | 2007-07-07 22:22:02 -0700 | [diff] [blame] | 37 | static struct xt_target xt_notrack_target[] __read_mostly = { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 38 | { |
| 39 | .name = "NOTRACK", |
| 40 | .family = AF_INET, |
| 41 | .target = target, |
| 42 | .table = "raw", |
| 43 | .me = THIS_MODULE, |
| 44 | }, |
| 45 | { |
| 46 | .name = "NOTRACK", |
| 47 | .family = AF_INET6, |
| 48 | .target = target, |
| 49 | .table = "raw", |
| 50 | .me = THIS_MODULE, |
| 51 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | }; |
| 53 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 54 | static int __init xt_notrack_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 56 | return xt_register_targets(xt_notrack_target, |
| 57 | ARRAY_SIZE(xt_notrack_target)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | } |
| 59 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 60 | static void __exit xt_notrack_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 62 | xt_unregister_targets(xt_notrack_target, ARRAY_SIZE(xt_notrack_target)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | } |
| 64 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 65 | module_init(xt_notrack_init); |
| 66 | module_exit(xt_notrack_fini); |