Release 4.15 net/netfilter/xt_connlabel.c

/*
 * (C) 2013 Astaro GmbH & Co KG
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/skbuff.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_labels.h>
#include <linux/netfilter/x_tables.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
MODULE_DESCRIPTION("Xtables: add/match connection trackling labels");
MODULE_ALIAS("ipt_connlabel");
MODULE_ALIAS("ip6t_connlabel");


static bool

connlabel_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_connlabel_mtinfo *info = par->matchinfo;
	enum ip_conntrack_info ctinfo;
	struct nf_conn_labels *labels;
	struct nf_conn *ct;
	bool invert = info->options & XT_CONNLABEL_OP_INVERT;

	ct = nf_ct_get(skb, &ctinfo);
	if (ct == NULL)
		return invert;

	labels = nf_ct_labels_find(ct);
	if (!labels)
		return invert;

	if (test_bit(info->bit, labels->bits))
		return !invert;

	if (info->options & XT_CONNLABEL_OP_SET) {
		if (!test_and_set_bit(info->bit, labels->bits))
			nf_conntrack_event_cache(IPCT_LABEL, ct);

		return !invert;
	}

	return invert;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Florian Westphal
139
100.00%
2
100.00%
Total
139
100.00%
2
100.00%



static int connlabel_mt_check(const struct xt_mtchk_param *par)
{
	const int options = XT_CONNLABEL_OP_INVERT |
			    XT_CONNLABEL_OP_SET;
	struct xt_connlabel_mtinfo *info = par->matchinfo;
	int ret;

	if (info->options & ~options) {
		pr_err("Unknown options in mask %x\n", info->options);
		return -EINVAL;
	}

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

	ret = nf_connlabels_get(par->net, info->bit);
	if (ret < 0)
		nf_ct_netns_put(par->net, par->family);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Florian Westphal
111
90.98%
2
66.67%
Joe Stringer
11
9.02%
1
33.33%
Total
122
100.00%
3
100.00%



static void connlabel_mt_destroy(const struct xt_mtdtor_param *par)
{
	nf_connlabels_put(par->net);
	nf_ct_netns_put(par->net, par->family);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Florian Westphal
27
90.00%
2
66.67%
Joe Stringer
3
10.00%
1
33.33%
Total
30
100.00%
3
100.00%


static struct xt_match connlabels_mt_reg __read_mostly = {
	.name           = "connlabel",
	.family         = NFPROTO_UNSPEC,
	.checkentry     = connlabel_mt_check,
	.match          = connlabel_mt,
	.matchsize      = sizeof(struct xt_connlabel_mtinfo),
	.destroy        = connlabel_mt_destroy,
	.me             = THIS_MODULE,
};



static int __init connlabel_mt_init(void)
{
	return xt_register_match(&connlabels_mt_reg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Florian Westphal
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%



static void __exit connlabel_mt_exit(void)
{
	xt_unregister_match(&connlabels_mt_reg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Florian Westphal
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%


module_init(connlabel_mt_init);

module_exit(connlabel_mt_exit);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Florian Westphal
409
96.69%
3
75.00%
Joe Stringer
14
3.31%
1
25.00%
Total
423
100.00%
4
100.00%
Directory: net/netfilter

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.