[linux-block.git] / net / netfilter / xt_LOG.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * This is a module which is used for logging packets.
 */

/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/ip.h>
#include <net/ipv6.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/tcp.h>
#include <net/route.h>

#include <linux/netfilter.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_LOG.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <net/netfilter/nf_log.h>

static unsigned int
log_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_log_info *loginfo = par->targinfo;
	struct net *net = xt_net(par);
	struct nf_loginfo li;

	li.type = NF_LOG_TYPE_LOG;
	li.u.log.level = loginfo->level;
	li.u.log.logflags = loginfo->logflags;

	nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
		      xt_out(par), &li, "%s", loginfo->prefix);
	return XT_CONTINUE;
}

static int log_tg_check(const struct xt_tgchk_param *par)
{
	const struct xt_log_info *loginfo = par->targinfo;
	int ret;

	if (par->family != NFPROTO_IPV4 && par->family != NFPROTO_IPV6)
		return -EINVAL;

	if (loginfo->level >= 8) {
		pr_debug("level %u >= 8\n", loginfo->level);
		return -EINVAL;
	}

	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
		pr_debug("prefix is not null-terminated\n");
		return -EINVAL;
	}

	ret = nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
	if (ret != 0 && !par->nft_compat) {
		request_module("%s", "nf_log_syslog");

		ret = nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
	}

	return ret;
}

static void log_tg_destroy(const struct xt_tgdtor_param *par)
{
	nf_logger_put(par->family, NF_LOG_TYPE_LOG);
}

static struct xt_target log_tg_regs[] __read_mostly = {
	{
		.name		= "LOG",
		.family		= NFPROTO_IPV4,
		.target		= log_tg,
		.targetsize	= sizeof(struct xt_log_info),
		.checkentry	= log_tg_check,
		.destroy	= log_tg_destroy,
		.me		= THIS_MODULE,
	},
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
	{
		.name		= "LOG",
		.family		= NFPROTO_IPV6,
		.target		= log_tg,
		.targetsize	= sizeof(struct xt_log_info),
		.checkentry	= log_tg_check,
		.destroy	= log_tg_destroy,
		.me		= THIS_MODULE,
	},
#endif
};

static int __init log_tg_init(void)
{
	return xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
}

static void __exit log_tg_exit(void)
{
	xt_unregister_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
}

module_init(log_tg_init);
module_exit(log_tg_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
MODULE_DESCRIPTION("Xtables: IPv4/IPv6 packet logging");
MODULE_ALIAS("ipt_LOG");
MODULE_ALIAS("ip6t_LOG");
MODULE_SOFTDEP("pre: nf_log_syslog");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
6939c33a RW	2	/*
	3	* This is a module which is used for logging packets.
	4	*/
	5
	6	/* (C) 1999-2001 Paul `Rusty' Russell
	7	* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
6939c33a RW	8	*/
	9
	10	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	11	#include <linux/module.h>
	12	#include <linux/spinlock.h>
	13	#include <linux/skbuff.h>
	14	#include <linux/if_arp.h>
	15	#include <linux/ip.h>
	16	#include <net/ipv6.h>
	17	#include <net/icmp.h>
	18	#include <net/udp.h>
	19	#include <net/tcp.h>
	20	#include <net/route.h>
	21
	22	#include <linux/netfilter.h>
	23	#include <linux/netfilter/x_tables.h>
	24	#include <linux/netfilter/xt_LOG.h>
	25	#include <linux/netfilter_ipv6/ip6_tables.h>
	26	#include <net/netfilter/nf_log.h>
6939c33a	27
6939c33a RW	28	static unsigned int
	29	log_tg(struct sk_buff skb, const struct xt_action_param par)
	30	{
	31	const struct xt_log_info *loginfo = par->targinfo;
613dbd95	32	struct net *net = xt_net(par);
6939c33a RW	33	struct nf_loginfo li;
	34
	35	li.type = NF_LOG_TYPE_LOG;
	36	li.u.log.level = loginfo->level;
	37	li.u.log.logflags = loginfo->logflags;
	38
613dbd95 PNA	39	nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
613dbd95 PNA	40	xt_out(par), &li, "%s", loginfo->prefix);
6939c33a RW	41	return XT_CONTINUE;
	42	}
	43
	44	static int log_tg_check(const struct xt_tgchk_param *par)
	45	{
	46	const struct xt_log_info *loginfo = par->targinfo;
b53deef0	47	int ret;
6939c33a RW	48
	49	if (par->family != NFPROTO_IPV4 && par->family != NFPROTO_IPV6)
	50	return -EINVAL;
	51
	52	if (loginfo->level >= 8) {
	53	pr_debug("level %u >= 8\n", loginfo->level);
	54	return -EINVAL;
	55	}
	56
	57	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
	58	pr_debug("prefix is not null-terminated\n");
	59	return -EINVAL;
	60	}
	61
b53deef0 FW	62	ret = nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
	63	if (ret != 0 && !par->nft_compat) {
	64	request_module("%s", "nf_log_syslog");
	65
	66	ret = nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
	67	}
	68
	69	return ret;
fab4085f PNA	70	}
	71
	72	static void log_tg_destroy(const struct xt_tgdtor_param *par)
	73	{
	74	nf_logger_put(par->family, NF_LOG_TYPE_LOG);
6939c33a RW	75	}
	76
	77	static struct xt_target log_tg_regs[] __read_mostly = {
	78	{
	79	.name = "LOG",
	80	.family = NFPROTO_IPV4,
	81	.target = log_tg,
	82	.targetsize = sizeof(struct xt_log_info),
	83	.checkentry = log_tg_check,
fab4085f	84	.destroy = log_tg_destroy,
6939c33a RW	85	.me = THIS_MODULE,
6939c33a RW	86	},
a0f65a26	87	#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
6939c33a RW	88	{
	89	.name = "LOG",
	90	.family = NFPROTO_IPV6,
	91	.target = log_tg,
	92	.targetsize = sizeof(struct xt_log_info),
	93	.checkentry = log_tg_check,
fab4085f	94	.destroy = log_tg_destroy,
6939c33a RW	95	.me = THIS_MODULE,
	96	},
	97	#endif
	98	};
	99
6939c33a RW	100	static int __init log_tg_init(void)
6939c33a RW	101	{
83e96d44	102	return xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
6939c33a RW	103	}
	104
	105	static void __exit log_tg_exit(void)
	106	{
6939c33a RW	107	xt_unregister_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
	108	}
	109
	110	module_init(log_tg_init);
	111	module_exit(log_tg_exit);
	112
	113	MODULE_LICENSE("GPL");
	114	MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
	115	MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
	116	MODULE_DESCRIPTION("Xtables: IPv4/IPv6 packet logging");
	117	MODULE_ALIAS("ipt_LOG");
	118	MODULE_ALIAS("ip6t_LOG");
a38b5b56	119	MODULE_SOFTDEP("pre: nf_log_syslog");