// SPDX-License-Identifier: GPL-2.0-only
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/*
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* This is a module which is used for logging packets.
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*/
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/ip.h>
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#include <net/ipv6.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/tcp.h>
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#include <net/route.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_LOG.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <net/netfilter/nf_log.h>
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static unsigned int
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log_tg(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct xt_log_info *loginfo = par->targinfo;
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struct net *net = xt_net(par);
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struct nf_loginfo li;
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li.type = NF_LOG_TYPE_LOG;
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li.u.log.level = loginfo->level;
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li.u.log.logflags = loginfo->logflags;
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nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
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xt_out(par), &li, "%s", loginfo->prefix);
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return XT_CONTINUE;
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}
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static int log_tg_check(const struct xt_tgchk_param *par)
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{
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const struct xt_log_info *loginfo = par->targinfo;
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if (par->family != NFPROTO_IPV4 && par->family != NFPROTO_IPV6)
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return -EINVAL;
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if (loginfo->level >= 8) {
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pr_debug("level %u >= 8\n", loginfo->level);
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return -EINVAL;
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}
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if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') {
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pr_debug("prefix is not null-terminated\n");
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return -EINVAL;
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}
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return nf_logger_find_get(par->family, NF_LOG_TYPE_LOG);
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}
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static void log_tg_destroy(const struct xt_tgdtor_param *par)
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{
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nf_logger_put(par->family, NF_LOG_TYPE_LOG);
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}
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static struct xt_target log_tg_regs[] __read_mostly = {
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{
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.name = "LOG",
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.family = NFPROTO_IPV4,
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.target = log_tg,
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.targetsize = sizeof(struct xt_log_info),
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.checkentry = log_tg_check,
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.destroy = log_tg_destroy,
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.me = THIS_MODULE,
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},
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#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
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{
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.name = "LOG",
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.family = NFPROTO_IPV6,
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.target = log_tg,
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.targetsize = sizeof(struct xt_log_info),
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.checkentry = log_tg_check,
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.destroy = log_tg_destroy,
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.me = THIS_MODULE,
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},
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#endif
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};
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static int __init log_tg_init(void)
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{
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return xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
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}
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static void __exit log_tg_exit(void)
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{
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xt_unregister_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
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}
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module_init(log_tg_init);
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module_exit(log_tg_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
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MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
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MODULE_DESCRIPTION("Xtables: IPv4/IPv6 packet logging");
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MODULE_ALIAS("ipt_LOG");
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MODULE_ALIAS("ip6t_LOG");
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