Release 4.18 net/netfilter/xt_TEE.c

/*
 *      "TEE" target extension for Xtables
 *      Copyright © Sebastian Claßen, 2007
 *      Jan Engelhardt, 2007-2010
 *
 *      based on ipt_ROUTE.c from Cédric de Launois
 *      <delaunois@info.ucl.be>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      version 2 or later, as published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/route.h>
#include <linux/netfilter/x_tables.h>
#include <net/route.h>
#include <net/netfilter/ipv4/nf_dup_ipv4.h>
#include <net/netfilter/ipv6/nf_dup_ipv6.h>
#include <linux/netfilter/xt_TEE.h>


struct xt_tee_priv {
	
struct list_head	list;
	
struct xt_tee_tginfo	*tginfo;
	
int			oif;
};


static const union nf_inet_addr tee_zero_address;


static unsigned int

tee_tg4(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_tee_tginfo *info = par->targinfo;
	int oif = info->priv ? info->priv->oif : 0;

	nf_dup_ipv4(xt_net(par), skb, xt_hooknum(par), &info->gw.in, oif);

	return XT_CONTINUE;
}

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Jan Engelhardt
26
37.14%
1
16.67%
Pablo Neira Ayuso
24
34.29%
2
33.33%
Eric Dumazet
15
21.43%
1
16.67%
Patrick McHardy
3
4.29%
1
16.67%
Eric W. Biedermann
2
2.86%
1
16.67%
Total
70
100.00%
6
100.00%

#if IS_ENABLED(CONFIG_IPV6)

static unsigned int

tee_tg6(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_tee_tginfo *info = par->targinfo;
	int oif = info->priv ? info->priv->oif : 0;

	nf_dup_ipv6(xt_net(par), skb, xt_hooknum(par), &info->gw.in6, oif);

	return XT_CONTINUE;
}
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Jan Engelhardt
36
51.43%
2
25.00%
Eric Dumazet
16
22.86%
2
25.00%
Pablo Neira Ayuso
15
21.43%
2
25.00%
Eric W. Biedermann
2
2.86%
1
12.50%
Patrick McHardy
1
1.43%
1
12.50%
Total
70
100.00%
8
100.00%

#endif

static DEFINE_MUTEX(priv_list_mutex);
static LIST_HEAD(priv_list);



static int tee_netdev_event(struct notifier_block *this, unsigned long event,
			    void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct xt_tee_priv *priv;

	mutex_lock(&priv_list_mutex);
	list_for_each_entry(priv, &priv_list, list) {
		switch (event) {
		case NETDEV_REGISTER:
			if (!strcmp(dev->name, priv->tginfo->oif))
				priv->oif = dev->ifindex;
			break;
		case NETDEV_UNREGISTER:
			if (dev->ifindex == priv->oif)
				priv->oif = -1;
			break;
		case NETDEV_CHANGENAME:
			if (!strcmp(dev->name, priv->tginfo->oif))
				priv->oif = dev->ifindex;
			else if (dev->ifindex == priv->oif)
				priv->oif = -1;
			break;
		}
	}
	mutex_unlock(&priv_list_mutex);

	return NOTIFY_DONE;
}

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139
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Kirill Tkhai
18
11.25%
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33.33%
Jiri Pirko
3
1.88%
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33.33%
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static int tee_tg_check(const struct xt_tgchk_param *par)
{
	struct xt_tee_tginfo *info = par->targinfo;
	struct xt_tee_priv *priv;

	/* 0.0.0.0 and :: not allowed */
	if (memcmp(&info->gw, &tee_zero_address,
		   sizeof(tee_zero_address)) == 0)
		return -EINVAL;

	if (info->oif[0]) {
		if (info->oif[sizeof(info->oif)-1] != '\0')
			return -EINVAL;

		priv = kzalloc(sizeof(*priv), GFP_KERNEL);
		if (priv == NULL)
			return -ENOMEM;

		priv->tginfo  = info;
		priv->oif     = -1;
		info->priv    = priv;

		mutex_lock(&priv_list_mutex);
		list_add(&priv->list, &priv_list);
		mutex_unlock(&priv_list_mutex);
	} else
		info->priv = NULL;

	static_key_slow_inc(&xt_tee_enabled);
	return 0;
}

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1
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Jan Engelhardt
52
31.52%
1
20.00%
Kirill Tkhai
14
8.48%
1
20.00%
Florian Westphal
6
3.64%
1
20.00%
Gao Feng
3
1.82%
1
20.00%
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165
100.00%
5
100.00%



static void tee_tg_destroy(const struct xt_tgdtor_param *par)
{
	struct xt_tee_tginfo *info = par->targinfo;

	if (info->priv) {
		mutex_lock(&priv_list_mutex);
		list_del(&info->priv->list);
		mutex_unlock(&priv_list_mutex);
		kfree(info->priv);
	}
	static_key_slow_dec(&xt_tee_enabled);
}

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Patrick McHardy
44
68.75%
1
33.33%
Kirill Tkhai
14
21.88%
1
33.33%
Florian Westphal
6
9.38%
1
33.33%
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64
100.00%
3
100.00%


static struct xt_target tee_tg_reg[] __read_mostly = {
	{
		.name       = "TEE",
		.revision   = 1,
		.family     = NFPROTO_IPV4,
		.target     = tee_tg4,
		.targetsize = sizeof(struct xt_tee_tginfo),
		.usersize   = offsetof(struct xt_tee_tginfo, priv),
		.checkentry = tee_tg_check,
		.destroy    = tee_tg_destroy,
		.me         = THIS_MODULE,
        },
#if IS_ENABLED(CONFIG_IPV6)
	{
		.name       = "TEE",
		.revision   = 1,
		.family     = NFPROTO_IPV6,
		.target     = tee_tg6,
		.targetsize = sizeof(struct xt_tee_tginfo),
		.usersize   = offsetof(struct xt_tee_tginfo, priv),
		.checkentry = tee_tg_check,
		.destroy    = tee_tg_destroy,
		.me         = THIS_MODULE,
        },
#endif
};


static struct notifier_block tee_netdev_notifier = {
	.notifier_call = tee_netdev_event,
};



static int __init tee_tg_init(void)
{
	int ret;

	ret = xt_register_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg));
	if (ret)
		return ret;
	ret = register_netdevice_notifier(&tee_netdev_notifier);
	if (ret) {
		xt_unregister_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg));
		return ret;
	}

	return 0;
}

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42
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50.00%
Jan Engelhardt
19
31.15%
1
50.00%
Total
61
100.00%
2
100.00%



static void __exit tee_tg_exit(void)
{
	unregister_netdevice_notifier(&tee_netdev_notifier);
	xt_unregister_targets(tee_tg_reg, ARRAY_SIZE(tee_tg_reg));
}

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19
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Kirill Tkhai
6
24.00%
1
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2
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module_init(tee_tg_init);
module_exit(tee_tg_exit);
MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>");
MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
MODULE_DESCRIPTION("Xtables: Reroute packet copy");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_TEE");
MODULE_ALIAS("ip6t_TEE");
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314
36.22%
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13.33%
Patrick McHardy
302
34.83%
1
6.67%
Kirill Tkhai
120
13.84%
1
6.67%
Pablo Neira Ayuso
49
5.65%
2
13.33%
Eric Dumazet
36
4.15%
3
20.00%
Willem de Bruijn
22
2.54%
1
6.67%
Florian Westphal
12
1.38%
1
6.67%
Eric W. Biedermann
4
0.46%
1
6.67%
Jiri Pirko
3
0.35%
1
6.67%
Gao Feng
3
0.35%
1
6.67%
Arnd Bergmann
2
0.23%
1
6.67%
Total
867
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15
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Directory: net/netfilter

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