Release 4.16 net/netfilter/xt_CONNSECMARK.c

/*
 * This module is used to copy security markings from packets
 * to connections, and restore security markings from connections
 * back to packets.  This would normally be performed in conjunction
 * with the SECMARK target and state match.
 *
 * Based somewhat on CONNMARK:
 *   Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
 *    by Henrik Nordstrom <hno@marasystems.com>
 *
 * (C) 2006,2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_CONNSECMARK.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_ecache.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("James Morris <jmorris@redhat.com>");
MODULE_DESCRIPTION("Xtables: target for copying between connection and security mark");
MODULE_ALIAS("ipt_CONNSECMARK");
MODULE_ALIAS("ip6t_CONNSECMARK");

/*
 * If the packet has a security mark and the connection does not, copy
 * the security mark from the packet to the connection.
 */


static void secmark_save(const struct sk_buff *skb)
{
	if (skb->secmark) {
		struct nf_conn *ct;
		enum ip_conntrack_info ctinfo;

		ct = nf_ct_get(skb, &ctinfo);
		if (ct && !ct->secmark) {
			ct->secmark = skb->secmark;
			nf_conntrack_event_cache(IPCT_SECMARK, ct);
		}
	}
}

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James Morris
43
66.15%
1
20.00%
Patrick McHardy
12
18.46%
1
20.00%
Pablo Neira Ayuso
8
12.31%
1
20.00%
Jan Engelhardt
1
1.54%
1
20.00%
Alexey Dobriyan
1
1.54%
1
20.00%
Total
65
100.00%
5
100.00%

/*
 * If packet has no security mark, and the connection does, restore the
 * security mark from the connection to the packet.
 */


static void secmark_restore(struct sk_buff *skb)
{
	if (!skb->secmark) {
		const struct nf_conn *ct;
		enum ip_conntrack_info ctinfo;

		ct = nf_ct_get(skb, &ctinfo);
		if (ct && ct->secmark)
			skb->secmark = ct->secmark;
	}
}

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James Morris
43
76.79%
1
33.33%
Patrick McHardy
12
21.43%
1
33.33%
Jan Engelhardt
1
1.79%
1
33.33%
Total
56
100.00%
3
100.00%


static unsigned int

connsecmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_connsecmark_target_info *info = par->targinfo;

	switch (info->mode) {
	case CONNSECMARK_SAVE:
		secmark_save(skb);
		break;

	case CONNSECMARK_RESTORE:
		secmark_restore(skb);
		break;

	default:
		BUG();
	}

	return XT_CONTINUE;
}

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James Morris
55
90.16%
1
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Jan Engelhardt
5
8.20%
3
60.00%
Herbert Xu
1
1.64%
1
20.00%
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61
100.00%
5
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static int connsecmark_tg_check(const struct xt_tgchk_param *par)
{
	const struct xt_connsecmark_target_info *info = par->targinfo;
	int ret;

	if (strcmp(par->table, "mangle") != 0 &&
	    strcmp(par->table, "security") != 0) {
		pr_info_ratelimited("only valid in \'mangle\' or \'security\' table, not \'%s\'\n",
				    par->table);
		return -EINVAL;
	}

	switch (info->mode) {
	case CONNSECMARK_SAVE:
	case CONNSECMARK_RESTORE:
		break;

	default:
		pr_info_ratelimited("invalid mode: %hu\n", info->mode);
		return -EINVAL;
	}

	ret = nf_ct_netns_get(par->net, par->family);
	if (ret < 0)
		pr_info_ratelimited("cannot load conntrack support for proto=%u\n",
				    par->family);
	return ret;
}

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James Morris
57
45.97%
2
15.38%
Florian Westphal
9
7.26%
3
23.08%
Total
124
100.00%
13
100.00%



static void connsecmark_tg_destroy(const struct xt_tgdtor_param *par)
{
	nf_ct_netns_put(par->net, par->family);
}

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13
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25.00%
Jan Engelhardt
5
21.74%
2
50.00%
Florian Westphal
5
21.74%
1
25.00%
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23
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4
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static struct xt_target connsecmark_tg_reg __read_mostly = {
	.name       = "CONNSECMARK",
	.revision   = 0,
	.family     = NFPROTO_UNSPEC,
	.checkentry = connsecmark_tg_check,
	.destroy    = connsecmark_tg_destroy,
	.target     = connsecmark_tg,
	.targetsize = sizeof(struct xt_connsecmark_target_info),
	.me         = THIS_MODULE,
};



static int __init connsecmark_tg_init(void)
{
	return xt_register_target(&connsecmark_tg_reg);
}

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James Morris
11
68.75%
1
25.00%
Jan Engelhardt
4
25.00%
2
50.00%
Patrick McHardy
1
6.25%
1
25.00%
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16
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4
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static void __exit connsecmark_tg_exit(void)
{
	xt_unregister_target(&connsecmark_tg_reg);
}

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James Morris
10
66.67%
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Jan Engelhardt
4
26.67%
2
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Patrick McHardy
1
6.67%
1
25.00%
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module_init(connsecmark_tg_init);
module_exit(connsecmark_tg_exit);
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James Morris
305
64.21%
2
7.69%
Jan Engelhardt
95
20.00%
14
53.85%
Patrick McHardy
31
6.53%
3
11.54%
Yasuyuki Kozakai
17
3.58%
1
3.85%
Florian Westphal
14
2.95%
3
11.54%
Pablo Neira Ayuso
11
2.32%
1
3.85%
Alexey Dobriyan
1
0.21%
1
3.85%
Herbert Xu
1
0.21%
1
3.85%
Total
475
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26
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Directory: net/netfilter

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