xt_TRACE.c

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/* This is a module which is used to mark packets for tracing.
 */
#include <linux/module.h>
#include <linux/skbuff.h>

#include <linux/netfilter/x_tables.h>

MODULE_DESCRIPTION("Xtables: packet flow tracing");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_TRACE");
MODULE_ALIAS("ip6t_TRACE");

static unsigned int
trace_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
    skb->nf_trace = 1;
    return XT_CONTINUE;
}

static struct xt_target trace_tg_reg __read_mostly = {
    .name       = "TRACE",
    .revision   = 0,
    .family     = NFPROTO_UNSPEC,
    .table      = "raw",
    .target     = trace_tg,
    .me         = THIS_MODULE,
};

static int __init trace_tg_init(void)
{
    return xt_register_target(&trace_tg_reg);
}

static void __exit trace_tg_exit(void)
{
    xt_unregister_target(&trace_tg_reg);
}

module_init(trace_tg_init);
module_exit(trace_tg_exit);