// 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 intlog_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_info_ratelimited("level %u >= 8\n", loginfo->level);		return -EINVAL;	} 	if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {		pr_info_ratelimited("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");