[IPV4]: IFA_{LOCAL,ADDRESS,BROADCAST,ANYCAST} on ipv4 annotated
[linux-2.6] / net / netfilter / xt_NOTRACK.c
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
7 #include <linux/netfilter/x_tables.h>
8 #include <net/netfilter/nf_conntrack_compat.h>
9
10 MODULE_LICENSE("GPL");
11 MODULE_ALIAS("ipt_NOTRACK");
12
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,
18        const struct xt_target *target,
19        const void *targinfo)
20 {
21         /* Previously seen (loopback)? Ignore. */
22         if ((*pskb)->nfct != NULL)
23                 return XT_CONTINUE;
24
25         /* Attach fake conntrack entry. 
26            If there is a real ct entry correspondig to this packet, 
27            it'll hang aroun till timing out. We don't deal with it
28            for performance reasons. JK */
29         nf_ct_untrack(*pskb);
30         (*pskb)->nfctinfo = IP_CT_NEW;
31         nf_conntrack_get((*pskb)->nfct);
32
33         return XT_CONTINUE;
34 }
35
36 static struct xt_target xt_notrack_target[] = {
37         {
38                 .name           = "NOTRACK",
39                 .family         = AF_INET,
40                 .target         = target,
41                 .table          = "raw",
42                 .me             = THIS_MODULE,
43         },
44         {
45                 .name           = "NOTRACK",
46                 .family         = AF_INET6,
47                 .target         = target,
48                 .table          = "raw",
49                 .me             = THIS_MODULE,
50         },
51 };
52
53 static int __init xt_notrack_init(void)
54 {
55         return xt_register_targets(xt_notrack_target,
56                                    ARRAY_SIZE(xt_notrack_target));
57 }
58
59 static void __exit xt_notrack_fini(void)
60 {
61         xt_unregister_targets(xt_notrack_target, ARRAY_SIZE(xt_notrack_target));
62 }
63
64 module_init(xt_notrack_init);
65 module_exit(xt_notrack_fini);