This file is indexed.

/usr/src/xtables-addons-2.3/xt_LOGMARK.c is in xtables-addons-dkms 2.3-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
/*
 *	"LOGMARK" target extension to Xtables
 *	useful for debugging
 *
 *	Copyright © Jan Engelhardt, 2008-2010
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License; either
 *	version 2 of the License, or any later version, as published by the
 *	Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/version.h>
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/netfilter/x_tables.h>
#include "compat_xtables.h"
#include "xt_LOGMARK.h"

static const char *const hook_names[] = {
	[NF_INET_PRE_ROUTING]  = "PREROUTING",
	[NF_INET_LOCAL_IN]     = "INPUT",
	[NF_INET_FORWARD]      = "FORWARD",
	[NF_INET_LOCAL_OUT]    = "OUTPUT",
	[NF_INET_POST_ROUTING] = "POSTROUTING",
};

static const char *const dir_names[] = {
	"ORIGINAL", "REPLY",
};

static void logmark_ct(const struct nf_conn *ct, enum ip_conntrack_info ctinfo)
{
	bool prev = false;

	printk(" ct=0x%p ctmark=0x%x ctstate=", ct, ct->mark);
	ctinfo %= IP_CT_IS_REPLY;
	if (ctinfo == IP_CT_NEW)
		printk("NEW");
	else if (ctinfo == IP_CT_ESTABLISHED)
		printk("ESTABLISHED");
	else if (ctinfo == IP_CT_RELATED)
		printk("RELATED");
	if (test_bit(IPS_SRC_NAT_BIT, &ct->status))
		printk(",SNAT");
	if (test_bit(IPS_DST_NAT_BIT, &ct->status))
		printk(",DNAT");

	printk(" ctstatus=");
	if (ct->status & IPS_EXPECTED) {
		printk("EXPECTED");
		prev = true;
	}
	if (ct->status & IPS_SEEN_REPLY)
		printk("%s""SEEN_REPLY", prev++ ? "," : "");
	if (ct->status & IPS_ASSURED)
		printk("%s""ASSURED", prev++ ? "," : "");
	if (ct->status & IPS_CONFIRMED)
		printk("%s""CONFIRMED", prev++ ? "," : "");
	printk(" lifetime=%lus",
	       (jiffies - ct->timeout.expires) / HZ);
}

static unsigned int
logmark_tg(struct sk_buff **pskb, const struct xt_action_param *par)
{
	const struct sk_buff *skb = *pskb;
	const struct xt_logmark_tginfo *info = par->targinfo;
	const struct nf_conn *ct;
	enum ip_conntrack_info ctinfo;

	printk("<%u>%.*s""iif=%d hook=%s nfmark=0x%x "
	       "secmark=0x%x classify=0x%x",
	       info->level, (unsigned int)sizeof(info->prefix), info->prefix,
	       skb_ifindex(skb), hook_names[par->hooknum],
	       skb_nfmark(skb), skb_secmark(skb), skb->priority);

	ct = nf_ct_get(skb, &ctinfo);
	printk(" ctdir=%s", dir_names[ctinfo >= IP_CT_IS_REPLY]);
	if (ct == NULL)
		printk(" ct=NULL ctmark=NULL ctstate=INVALID ctstatus=NONE");
	else if (nf_ct_is_untracked(ct))
		printk(" ct=UNTRACKED ctmark=NULL ctstate=UNTRACKED ctstatus=NONE");
	else
		logmark_ct(ct, ctinfo);

	printk("\n");
	return XT_CONTINUE;
}

static int
logmark_tg_check(const struct xt_tgchk_param *par)
{
	const struct xt_logmark_tginfo *info = par->targinfo;

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

	return 0;
}

static struct xt_target logmark_tg_reg[] __read_mostly = {
	{
		.name       = "LOGMARK",
		.revision   = 0,
		.family     = NFPROTO_IPV4,
		.checkentry = logmark_tg_check,
		.target     = logmark_tg,
		.targetsize = sizeof(struct xt_logmark_tginfo),
		.me         = THIS_MODULE,
	},
	{
		.name       = "LOGMARK",
		.revision   = 0,
		.family     = NFPROTO_IPV6,
		.checkentry = logmark_tg_check,
		.target     = logmark_tg,
		.targetsize = sizeof(struct xt_logmark_tginfo),
		.me         = THIS_MODULE,
	},
};

static int __init logmark_tg_init(void)
{
	return xt_register_targets(logmark_tg_reg, ARRAY_SIZE(logmark_tg_reg));
}

static void __exit logmark_tg_exit(void)
{
	xt_unregister_targets(logmark_tg_reg, ARRAY_SIZE(logmark_tg_reg));
}

module_init(logmark_tg_init);
module_exit(logmark_tg_exit);
MODULE_DESCRIPTION("Xtables: netfilter mark logging to syslog");
MODULE_AUTHOR("Jan Engelhardt ");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_LOGMARK");
MODULE_ALIAS("ip6t_LOGMARK");