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   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
   8 MODULE_LICENSE("GPL");
   9 MODULE_ALIAS("ipt_TRACE");
  10 MODULE_ALIAS("ip6t_TRACE");
  11
  12 static unsigned int
  13 target(struct sk_buff **pskb,
  14        const struct net_device *in,
  15        const struct net_device *out,
  16        unsigned int hooknum,
  17        const struct xt_target *target,
  18        const void *targinfo)
  19 {
  20         (*pskb)->nf_trace = 1;
  21         return XT_CONTINUE;
  22 }
  23
  24 static struct xt_target xt_trace_target[] __read_mostly = {
  25         {
  26                 .name           = "TRACE",
  27                 .family         = AF_INET,
  28                 .target         = target,
  29                 .table          = "raw",
  30                 .me             = THIS_MODULE,
  31         },
  32         {
  33                 .name           = "TRACE",
  34                 .family         = AF_INET6,
  35                 .target         = target,
  36                 .table          = "raw",
  37                 .me             = THIS_MODULE,
  38         },
  39 };
  40
  41 static int __init xt_trace_init(void)
  42 {
  43         return xt_register_targets(xt_trace_target,
  44                                    ARRAY_SIZE(xt_trace_target));
  45 }
  46
  47 static void __exit xt_trace_fini(void)
  48 {
  49         xt_unregister_targets(xt_trace_target, ARRAY_SIZE(xt_trace_target));
  50 }
  51
  52 module_init(xt_trace_init);
  53 module_exit(xt_trace_fini);