1 /* This is a module which is used to mark packets for tracing.
2 */
3 #include <linux/module.h>
4 #include <linux/skbuff.h>
5
6 #include <linux/netfilter/x_tables.h>
7 #include <net/netfilter/nf_log.h>
8
9 MODULE_DESCRIPTION("Xtables: packet flow tracing");
10 MODULE_LICENSE("GPL");
11 MODULE_ALIAS("ipt_TRACE");
12 MODULE_ALIAS("ip6t_TRACE");
13
14 static int trace_tg_check(const struct xt_tgchk_param *par)
15 {
16 return nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
17 }
18
19 static void trace_tg_destroy(const struct xt_tgdtor_param *par)
20 {
21 nf_logger_put(par->family, NF_LOG_TYPE_LOG);
22 }
23
24 static unsigned int
25 trace_tg(struct sk_buff *skb, const struct xt_action_param *par)
26 {
27 skb->nf_trace = 1;
28 return XT_CONTINUE;
29 }
30
31 static struct xt_target trace_tg_reg __read_mostly = {
32 .name = "TRACE",
33 .revision = 0,
34 .family = NFPROTO_UNSPEC,
35 .table = "raw",
36 .target = trace_tg,
37 .checkentry = trace_tg_check,
38 .destroy = trace_tg_destroy,
39 .me = THIS_MODULE,
40 };
41
42 static int __init trace_tg_init(void)
43 {
44 return xt_register_target(&trace_tg_reg);
45 }
46
47 static void __exit trace_tg_exit(void)
48 {
49 xt_unregister_target(&trace_tg_reg);
50 }
51
52 module_init(trace_tg_init);
53 module_exit(trace_tg_exit);
54
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