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Linux/net/netfilter/xt_TRACE.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* This is a module which is used to mark packets for tracing.
  3  */
  4 #include <linux/module.h>
  5 #include <linux/skbuff.h>
  6 
  7 #include <linux/netfilter/x_tables.h>
  8 #include <net/netfilter/nf_log.h>
  9 
 10 MODULE_DESCRIPTION("Xtables: packet flow tracing");
 11 MODULE_LICENSE("GPL");
 12 MODULE_ALIAS("ipt_TRACE");
 13 MODULE_ALIAS("ip6t_TRACE");
 14 
 15 static int trace_tg_check(const struct xt_tgchk_param *par)
 16 {
 17         return nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
 18 }
 19 
 20 static void trace_tg_destroy(const struct xt_tgdtor_param *par)
 21 {
 22         nf_logger_put(par->family, NF_LOG_TYPE_LOG);
 23 }
 24 
 25 static unsigned int
 26 trace_tg(struct sk_buff *skb, const struct xt_action_param *par)
 27 {
 28         skb->nf_trace = 1;
 29         return XT_CONTINUE;
 30 }
 31 
 32 static struct xt_target trace_tg_reg __read_mostly = {
 33         .name           = "TRACE",
 34         .revision       = 0,
 35         .family         = NFPROTO_UNSPEC,
 36         .table          = "raw",
 37         .target         = trace_tg,
 38         .checkentry     = trace_tg_check,
 39         .destroy        = trace_tg_destroy,
 40         .me             = THIS_MODULE,
 41 };
 42 
 43 static int __init trace_tg_init(void)
 44 {
 45         return xt_register_target(&trace_tg_reg);
 46 }
 47 
 48 static void __exit trace_tg_exit(void)
 49 {
 50         xt_unregister_target(&trace_tg_reg);
 51 }
 52 
 53 module_init(trace_tg_init);
 54 module_exit(trace_tg_exit);
 55 

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