ebt_nflog.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * ebt_nflog
 4 *
 5 *	Author:
 6 *	Peter Warasin <peter@endian.com>
 7 *
 8 *  February, 2008
 9 *
10 * Based on:
11 *  xt_NFLOG.c, (C) 2006 by Patrick McHardy <kaber@trash.net>
12 *  ebt_ulog.c, (C) 2004 by Bart De Schuymer <bdschuym@pandora.be>
13 *
14 */
15
16#include <linux/module.h>
17#include <linux/spinlock.h>
18#include <linux/netfilter/x_tables.h>
19#include <linux/netfilter_bridge/ebtables.h>
20#include <linux/netfilter_bridge/ebt_nflog.h>
21#include <net/netfilter/nf_log.h>
22
23static unsigned int
24ebt_nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
25{
26	const struct ebt_nflog_info *info = par->targinfo;
27	struct net *net = xt_net(par);
28	struct nf_loginfo li;
29
30	li.type = NF_LOG_TYPE_ULOG;
31	li.u.ulog.copy_len = info->len;
32	li.u.ulog.group = info->group;
33	li.u.ulog.qthreshold = info->threshold;
34	li.u.ulog.flags = 0;
35
36	nf_log_packet(net, PF_BRIDGE, xt_hooknum(par), skb, xt_in(par),
37		      xt_out(par), &li, "%s", info->prefix);
38	return EBT_CONTINUE;
39}
40
41static int ebt_nflog_tg_check(const struct xt_tgchk_param *par)
42{
43	struct ebt_nflog_info *info = par->targinfo;
44
45	if (info->flags & ~EBT_NFLOG_MASK)
46		return -EINVAL;
47	info->prefix[EBT_NFLOG_PREFIX_SIZE - 1] = '\0';
48	return 0;
49}
50
51static struct xt_target ebt_nflog_tg_reg __read_mostly = {
52	.name       = "nflog",
53	.revision   = 0,
54	.family     = NFPROTO_BRIDGE,
55	.target     = ebt_nflog_tg,
56	.checkentry = ebt_nflog_tg_check,
57	.targetsize = sizeof(struct ebt_nflog_info),
58	.me         = THIS_MODULE,
59};
60
61static int __init ebt_nflog_init(void)
62{
63	return xt_register_target(&ebt_nflog_tg_reg);
64}
65
66static void __exit ebt_nflog_fini(void)
67{
68	xt_unregister_target(&ebt_nflog_tg_reg);
69}
70
71module_init(ebt_nflog_init);
72module_exit(ebt_nflog_fini);
73MODULE_LICENSE("GPL");
74MODULE_AUTHOR("Peter Warasin <peter@endian.com>");
75MODULE_DESCRIPTION("ebtables NFLOG netfilter logging module");