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Linux/net/netfilter/xt_TRACE.c

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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 #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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