LXR linux/net/netfilter/xt

   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
  10MODULE_DESCRIPTION("Xtables: packet flow tracing");
  11MODULE_LICENSE("GPL");
  12MODULE_ALIAS("ipt_TRACE");
  13MODULE_ALIAS("ip6t_TRACE");
  14
  15static 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
  20static void trace_tg_destroy(const struct xt_tgdtor_param *par)
  21{
  22        nf_logger_put(par->family, NF_LOG_TYPE_LOG);
  23}
  24
  25static unsigned int
  26trace_tg(struct sk_buff *skb, const struct xt_action_param *par)
  27{
  28        skb->nf_trace = 1;
  29        return XT_CONTINUE;
  30}
  31
  32static 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
  43static int __init trace_tg_init(void)
  44{
  45        return xt_register_target(&trace_tg_reg);
  46}
  47
  48static void __exit trace_tg_exit(void)
  49{
  50        xt_unregister_target(&trace_tg_reg);
  51}
  52
  53module_init(trace_tg_init);
  54module_exit(trace_tg_exit);
  55MODULE_SOFTDEP("pre: nf_log_syslog");
  56