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// SPDX-License-Identifier: GPL-2.0-only
/* 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>
#include <net/netfilter/nf_log.h>
MODULE_DESCRIPTION("Xtables: packet flow tracing");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_TRACE");
MODULE_ALIAS("ip6t_TRACE");
static int trace_tg_check(const struct xt_tgchk_param *par)
{
return nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
}
static void trace_tg_destroy(const struct xt_tgdtor_param *par)
{
nf_logger_put(par->family, NF_LOG_TYPE_LOG);
}
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_IPV4,
.table = "raw",
.target = trace_tg,
.checkentry = trace_tg_check,
.destroy = trace_tg_destroy,
.me = THIS_MODULE,
},
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
{
.name = "TRACE",
.revision = 0,
.family = NFPROTO_IPV6,
.table = "raw",
.target = trace_tg,
.checkentry = trace_tg_check,
.destroy = trace_tg_destroy,
},
#endif
};
static int __init trace_tg_init(void)
{
return xt_register_targets(trace_tg_reg, ARRAY_SIZE(trace_tg_reg));
}
static void __exit trace_tg_exit(void)
{
xt_unregister_targets(trace_tg_reg, ARRAY_SIZE(trace_tg_reg));
}
module_init(trace_tg_init);
module_exit(trace_tg_exit);
MODULE_SOFTDEP("pre: nf_log_syslog");
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