Release 4.16 net/ipv4/netfilter/ipt_REJECT.c

/*
 * This is a module which is used for rejecting packets.
 */

/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
 *
 * 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/slab.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/icmp.h>
#include <net/icmp.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_REJECT.h>
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
#include <linux/netfilter_bridge.h>
#endif

#include <net/netfilter/ipv4/nf_reject.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv4");


static unsigned int

reject_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct ipt_reject_info *reject = par->targinfo;
	int hook = xt_hooknum(par);

	switch (reject->with) {
	case IPT_ICMP_NET_UNREACHABLE:
		nf_send_unreach(skb, ICMP_NET_UNREACH, hook);
		break;
	case IPT_ICMP_HOST_UNREACHABLE:
		nf_send_unreach(skb, ICMP_HOST_UNREACH, hook);
		break;
	case IPT_ICMP_PROT_UNREACHABLE:
		nf_send_unreach(skb, ICMP_PROT_UNREACH, hook);
		break;
	case IPT_ICMP_PORT_UNREACHABLE:
		nf_send_unreach(skb, ICMP_PORT_UNREACH, hook);
		break;
	case IPT_ICMP_NET_PROHIBITED:
		nf_send_unreach(skb, ICMP_NET_ANO, hook);
		break;
	case IPT_ICMP_HOST_PROHIBITED:
		nf_send_unreach(skb, ICMP_HOST_ANO, hook);
		break;
	case IPT_ICMP_ADMIN_PROHIBITED:
		nf_send_unreach(skb, ICMP_PKT_FILTERED, hook);
		break;
	case IPT_TCP_RESET:
		nf_send_reset(xt_net(par), skb, hook);
	case IPT_ICMP_ECHOREPLY:
		/* Doesn't happen. */
		break;
	}

	return NF_DROP;
}

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Florian Westphal
20
12.66%
1
7.69%
Maciej Soltysiak
9
5.70%
1
7.69%
Herbert Xu
9
5.70%
1
7.69%
Eric Leblond
8
5.06%
1
7.69%
Pablo Neira Ayuso
6
3.80%
1
7.69%
Jan Engelhardt
5
3.16%
3
23.08%
Linus Torvalds (pre-git)
3
1.90%
1
7.69%
Eric W. Biedermann
2
1.27%
1
7.69%
Harald Welte
1
0.63%
1
7.69%
Total
158
100.00%
13
100.00%



static int reject_tg_check(const struct xt_tgchk_param *par)
{
	const struct ipt_reject_info *rejinfo = par->targinfo;
	const struct ipt_entry *e = par->entryinfo;

	if (rejinfo->with == IPT_ICMP_ECHOREPLY) {
		pr_info_ratelimited("ECHOREPLY no longer supported.\n");
		return -EINVAL;
	} else if (rejinfo->with == IPT_TCP_RESET) {
		/* Must specify that it's a TCP packet */
		if (e->ip.proto != IPPROTO_TCP ||
		    (e->ip.invflags & XT_INV_PROTO)) {
			pr_info_ratelimited("TCP_RESET invalid for non-tcp\n");
			return -EINVAL;
		}
	}
	return 0;
}

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Linus Torvalds (pre-git)
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18.18%
Jan Engelhardt
17
17.53%
6
54.55%
Harald Welte
7
7.22%
1
9.09%
Florian Westphal
2
2.06%
1
9.09%
Patrick McHardy
1
1.03%
1
9.09%
Total
97
100.00%
11
100.00%


static struct xt_target reject_tg_reg __read_mostly = {
	.name		= "REJECT",
	.family		= NFPROTO_IPV4,
	.target		= reject_tg,
	.targetsize	= sizeof(struct ipt_reject_info),
	.table		= "filter",
	.hooks		= (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) |
			  (1 << NF_INET_LOCAL_OUT),
	.checkentry	= reject_tg_check,
	.me		= THIS_MODULE,
};



static int __init reject_tg_init(void)
{
	return xt_register_target(&reject_tg_reg);
}

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12
75.00%
1
25.00%
Jan Engelhardt
3
18.75%
2
50.00%
Daniele Bellucci
1
6.25%
1
25.00%
Total
16
100.00%
4
100.00%



static void __exit reject_tg_exit(void)
{
	xt_unregister_target(&reject_tg_reg);
}

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Linus Torvalds (pre-git)
12
80.00%
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33.33%
Jan Engelhardt
3
20.00%
2
66.67%
Total
15
100.00%
3
100.00%

module_init(reject_tg_init);
module_exit(reject_tg_exit);
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30.79%
2
5.56%
Linus Torvalds
95
21.99%
2
5.56%
Jan Engelhardt
50
11.57%
10
27.78%
Patrick McHardy
44
10.19%
6
16.67%
Harald Welte
23
5.32%
4
11.11%
Florian Westphal
22
5.09%
2
5.56%
Art Haas
13
3.01%
1
2.78%
Pablo Neira Ayuso
11
2.55%
2
5.56%
Eric Leblond
11
2.55%
1
2.78%
Herbert Xu
9
2.08%
1
2.78%
Maciej Soltysiak
9
2.08%
1
2.78%
Bart De Schuymer
6
1.39%
1
2.78%
Tejun Heo
3
0.69%
1
2.78%
Eric W. Biedermann
2
0.46%
1
2.78%
Daniele Bellucci
1
0.23%
1
2.78%
Total
432
100.00%
36
100.00%
Directory: net/ipv4/netfilter

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