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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120// 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_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");