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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2006 Patrick McHardy <kaber@trash.net>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_NFLOG.h>
#include <net/netfilter/nf_log.h>
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_DESCRIPTION("Xtables: packet logging to netlink using NFLOG");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_NFLOG");
MODULE_ALIAS("ip6t_NFLOG");
static unsigned int
nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct xt_nflog_info *info = par->targinfo;
struct net *net = xt_net(par);
struct nf_loginfo li;
li.type = NF_LOG_TYPE_ULOG;
li.u.ulog.copy_len = info->len;
li.u.ulog.group = info->group;
li.u.ulog.qthreshold = info->threshold;
li.u.ulog.flags = 0;
if (info->flags & XT_NFLOG_F_COPY_LEN)
li.u.ulog.flags |= NF_LOG_F_COPY_LEN;
nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
xt_out(par), &li, "%s", info->prefix);
return XT_CONTINUE;
}
static int nflog_tg_check(const struct xt_tgchk_param *par)
{
const struct xt_nflog_info *info = par->targinfo;
if (info->flags & ~XT_NFLOG_MASK)
return -EINVAL;
if (info->prefix[sizeof(info->prefix) - 1] != '\0')
return -EINVAL;
return nf_logger_find_get(par->family, NF_LOG_TYPE_ULOG);
}
static void nflog_tg_destroy(const struct xt_tgdtor_param *par)
{
nf_logger_put(par->family, NF_LOG_TYPE_ULOG);
}
static struct xt_target nflog_tg_reg __read_mostly = {
.name = "NFLOG",
.revision = 0,
.family = NFPROTO_UNSPEC,
.checkentry = nflog_tg_check,
.destroy = nflog_tg_destroy,
.target = nflog_tg,
.targetsize = sizeof(struct xt_nflog_info),
.me = THIS_MODULE,
};
static int __init nflog_tg_init(void)
{
return xt_register_target(&nflog_tg_reg);
}
static void __exit nflog_tg_exit(void)
{
xt_unregister_target(&nflog_tg_reg);
}
module_init(nflog_tg_init);
module_exit(nflog_tg_exit);
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