2 * This is a module which is used for logging packets.
5 /* (C) 1999-2001 Paul `Rusty' Russell
6 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/module.h>
15 #include <linux/spinlock.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
23 #include <net/route.h>
25 #include <linux/netfilter.h>
26 #include <linux/netfilter/x_tables.h>
27 #include <linux/netfilter/xt_LOG.h>
28 #include <linux/netfilter_ipv6/ip6_tables.h>
29 #include <net/netfilter/nf_log.h>
32 log_tg(struct sk_buff
*skb
, const struct xt_action_param
*par
)
34 const struct xt_log_info
*loginfo
= par
->targinfo
;
36 struct net
*net
= dev_net(par
->in
? par
->in
: par
->out
);
38 li
.type
= NF_LOG_TYPE_LOG
;
39 li
.u
.log
.level
= loginfo
->level
;
40 li
.u
.log
.logflags
= loginfo
->logflags
;
42 nf_log_packet(net
, par
->family
, par
->hooknum
, skb
, par
->in
, par
->out
,
43 &li
, "%s", loginfo
->prefix
);
47 static int log_tg_check(const struct xt_tgchk_param
*par
)
49 const struct xt_log_info
*loginfo
= par
->targinfo
;
51 if (par
->family
!= NFPROTO_IPV4
&& par
->family
!= NFPROTO_IPV6
)
54 if (loginfo
->level
>= 8) {
55 pr_debug("level %u >= 8\n", loginfo
->level
);
59 if (loginfo
->prefix
[sizeof(loginfo
->prefix
)-1] != '\0') {
60 pr_debug("prefix is not null-terminated\n");
64 return nf_logger_find_get(par
->family
, NF_LOG_TYPE_LOG
);
67 static void log_tg_destroy(const struct xt_tgdtor_param
*par
)
69 nf_logger_put(par
->family
, NF_LOG_TYPE_LOG
);
72 static struct xt_target log_tg_regs
[] __read_mostly
= {
75 .family
= NFPROTO_IPV4
,
77 .targetsize
= sizeof(struct xt_log_info
),
78 .checkentry
= log_tg_check
,
79 .destroy
= log_tg_destroy
,
82 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
85 .family
= NFPROTO_IPV6
,
87 .targetsize
= sizeof(struct xt_log_info
),
88 .checkentry
= log_tg_check
,
89 .destroy
= log_tg_destroy
,
95 static int __init
log_tg_init(void)
97 return xt_register_targets(log_tg_regs
, ARRAY_SIZE(log_tg_regs
));
100 static void __exit
log_tg_exit(void)
102 xt_unregister_targets(log_tg_regs
, ARRAY_SIZE(log_tg_regs
));
105 module_init(log_tg_init
);
106 module_exit(log_tg_exit
);
108 MODULE_LICENSE("GPL");
109 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
110 MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
111 MODULE_DESCRIPTION("Xtables: IPv4/IPv6 packet logging");
112 MODULE_ALIAS("ipt_LOG");
113 MODULE_ALIAS("ip6t_LOG");
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