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 #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);