Release 4.15 net/netfilter/xt_helper.c

/* iptables module to match on related connections */
/*
 * (C) 2001 Martin Josefsson <gandalf@wlug.westbo.se>
 *
 * 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.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_helper.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Josefsson <gandalf@netfilter.org>");
MODULE_DESCRIPTION("Xtables: Related connection matching");
MODULE_ALIAS("ipt_helper");
MODULE_ALIAS("ip6t_helper");



static bool

helper_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_helper_info *info = par->matchinfo;
	const struct nf_conn *ct;
	const struct nf_conn_help *master_help;
	const struct nf_conntrack_helper *helper;
	enum ip_conntrack_info ctinfo;
	bool ret = info->invert;

	ct = nf_ct_get(skb, &ctinfo);
	if (!ct || !ct->master)
		return ret;

	master_help = nfct_help(ct->master);
	if (!master_help)
		return ret;

	/* rcu_read_lock()ed by nf_hook_thresh */
	helper = rcu_dereference(master_help->helper);
	if (!helper)
		return ret;

	if (info->name[0] == '\0')
		ret = !ret;
	else
		ret ^= !strncmp(helper->name, info->name,
				strlen(helper->name));
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yasuyuki Kozakai
104
67.10%
1
10.00%
Patrick McHardy
22
14.19%
1
10.00%
Harald Welte
16
10.32%
2
20.00%
Jan Engelhardt
12
7.74%
5
50.00%
Aaron Conole
1
0.65%
1
10.00%
Total
155
100.00%
10
100.00%



static int helper_mt_check(const struct xt_mtchk_param *par)
{
	struct xt_helper_info *info = par->matchinfo;
	int ret;

	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;
	}
	info->name[sizeof(info->name) - 1] = '\0';
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jan Engelhardt
23
30.26%
6
50.00%
Harald Welte
23
30.26%
2
16.67%
Pablo Neira Ayuso
15
19.74%
1
8.33%
Gao Feng
8
10.53%
1
8.33%
Florian Westphal
5
6.58%
1
8.33%
Patrick McHardy
2
2.63%
1
8.33%
Total
76
100.00%
12
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Pablo Neira Ayuso
13
56.52%
1
25.00%
Jan Engelhardt
5
21.74%
2
50.00%
Florian Westphal
5
21.74%
1
25.00%
Total
23
100.00%
4
100.00%


static struct xt_match helper_mt_reg __read_mostly = {
	.name       = "helper",
	.revision   = 0,
	.family     = NFPROTO_UNSPEC,
	.checkentry = helper_mt_check,
	.match      = helper_mt,
	.destroy    = helper_mt_destroy,
	.matchsize  = sizeof(struct xt_helper_info),
	.me         = THIS_MODULE,
};



static int __init helper_mt_init(void)
{
	return xt_register_match(&helper_mt_reg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Harald Welte
11
68.75%
2
40.00%
Jan Engelhardt
4
25.00%
2
40.00%
Patrick McHardy
1
6.25%
1
20.00%
Total
16
100.00%
5
100.00%



static void __exit helper_mt_exit(void)
{
	xt_unregister_match(&helper_mt_reg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Harald Welte
10
66.67%
2
40.00%
Jan Engelhardt
4
26.67%
2
40.00%
Patrick McHardy
1
6.67%
1
20.00%
Total
15
100.00%
5
100.00%


module_init(helper_mt_init);

module_exit(helper_mt_exit);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Harald Welte
127
31.36%
5
15.62%
Yasuyuki Kozakai
113
27.90%
1
3.12%
Jan Engelhardt
65
16.05%
13
40.62%
Patrick McHardy
40
9.88%
6
18.75%
Pablo Neira Ayuso
35
8.64%
2
6.25%
Florian Westphal
10
2.47%
1
3.12%
Gao Feng
8
1.98%
1
3.12%
Art Haas
5
1.23%
1
3.12%
Aaron Conole
1
0.25%
1
3.12%
Andrew Morton
1
0.25%
1
3.12%
Total
405
100.00%
32
100.00%
Directory: net/netfilter

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