net/netfilter/xt_TRACE.c

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