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> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 8 | #include <net/netfilter/nf_conntrack_compat.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"); |
| 12 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | static unsigned int |
| 14 | target(struct sk_buff **pskb, |
| 15 | const struct net_device *in, |
| 16 | const struct net_device *out, |
| 17 | unsigned int hooknum, |
Patrick McHardy | c498673 | 2006-03-20 18:02:56 -0800 | [diff] [blame^] | 18 | const struct xt_target *target, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | const void *targinfo, |
| 20 | void *userinfo) |
| 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 | |
| 26 | /* Attach fake conntrack entry. |
| 27 | If there is a real ct entry correspondig to this packet, |
| 28 | it'll hang aroun till timing out. We don't deal with it |
| 29 | for performance reasons. JK */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 30 | nf_ct_untrack(*pskb); |
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 | 5d04bff | 2006-03-20 18:01:58 -0800 | [diff] [blame] | 37 | static struct xt_target notrack_reg = { |
| 38 | .name = "NOTRACK", |
| 39 | .target = target, |
| 40 | .targetsize = 0, |
| 41 | .table = "raw", |
| 42 | .me = THIS_MODULE, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 43 | }; |
Patrick McHardy | 5d04bff | 2006-03-20 18:01:58 -0800 | [diff] [blame] | 44 | |
| 45 | static struct xt_target notrack6_reg = { |
| 46 | .name = "NOTRACK", |
| 47 | .target = target, |
| 48 | .targetsize = 0, |
| 49 | .table = "raw", |
| 50 | .me = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | }; |
| 52 | |
| 53 | static int __init init(void) |
| 54 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 55 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 57 | ret = xt_register_target(AF_INET, ¬rack_reg); |
| 58 | if (ret) |
| 59 | return ret; |
| 60 | |
| 61 | ret = xt_register_target(AF_INET6, ¬rack6_reg); |
| 62 | if (ret) |
| 63 | xt_unregister_target(AF_INET, ¬rack_reg); |
| 64 | |
| 65 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | } |
| 67 | |
| 68 | static void __exit fini(void) |
| 69 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 70 | xt_unregister_target(AF_INET6, ¬rack6_reg); |
| 71 | xt_unregister_target(AF_INET, ¬rack_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | module_init(init); |
| 75 | module_exit(fini); |