Release 4.14 net/netfilter/nft_reject_inet.c

/*
 * Copyright (c) 2014 Patrick McHardy <kaber@trash.net>
 *
 * 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/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nft_reject.h>
#include <net/netfilter/ipv4/nf_reject.h>
#include <net/netfilter/ipv6/nf_reject.h>



static void nft_reject_inet_eval(const struct nft_expr *expr,
				 struct nft_regs *regs,
				 const struct nft_pktinfo *pkt)
{
	struct nft_reject *priv = nft_expr_priv(expr);

	switch (nft_pf(pkt)) {
	case NFPROTO_IPV4:
		switch (priv->type) {
		case NFT_REJECT_ICMP_UNREACH:
			nf_send_unreach(pkt->skb, priv->icmp_code,
					nft_hook(pkt));
			break;
		case NFT_REJECT_TCP_RST:
			nf_send_reset(nft_net(pkt), pkt->skb, nft_hook(pkt));
			break;
		case NFT_REJECT_ICMPX_UNREACH:
			nf_send_unreach(pkt->skb,
					nft_reject_icmp_code(priv->icmp_code),
					nft_hook(pkt));
			break;
		}
		break;
	case NFPROTO_IPV6:
		switch (priv->type) {
		case NFT_REJECT_ICMP_UNREACH:
			nf_send_unreach6(nft_net(pkt), pkt->skb,
					 priv->icmp_code, nft_hook(pkt));
			break;
		case NFT_REJECT_TCP_RST:
			nf_send_reset6(nft_net(pkt), pkt->skb, nft_hook(pkt));
			break;
		case NFT_REJECT_ICMPX_UNREACH:
			nf_send_unreach6(nft_net(pkt), pkt->skb,
					 nft_reject_icmpv6_code(priv->icmp_code),
					 nft_hook(pkt));
			break;
		}
		break;
	}

	regs->verdict.code = NF_DROP;
}

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Pablo Neira Ayuso
155
73.11%
2
28.57%
Patrick McHardy
47
22.17%
2
28.57%
Eric W. Biedermann
6
2.83%
2
28.57%
Florian Westphal
4
1.89%
1
14.29%
Total
212
100.00%
7
100.00%



static int nft_reject_inet_init(const struct nft_ctx *ctx,
				const struct nft_expr *expr,
				const struct nlattr * const tb[])
{
	struct nft_reject *priv = nft_expr_priv(expr);
	int icmp_code;

	if (tb[NFTA_REJECT_TYPE] == NULL)
		return -EINVAL;

	priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
	switch (priv->type) {
	case NFT_REJECT_ICMP_UNREACH:
	case NFT_REJECT_ICMPX_UNREACH:
		if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
			return -EINVAL;

		icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
		if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
		    icmp_code > NFT_REJECT_ICMPX_MAX)
			return -EINVAL;

		priv->icmp_code = icmp_code;
		break;
	case NFT_REJECT_TCP_RST:
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

Contributors
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Pablo Neira Ayuso
138
99.28%
1
50.00%
Patrick McHardy
1
0.72%
1
50.00%
Total
139
100.00%
2
100.00%



static int nft_reject_inet_dump(struct sk_buff *skb,
				const struct nft_expr *expr)
{
	const struct nft_reject *priv = nft_expr_priv(expr);

	if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
		goto nla_put_failure;

	switch (priv->type) {
	case NFT_REJECT_ICMP_UNREACH:
	case NFT_REJECT_ICMPX_UNREACH:
		if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
			goto nla_put_failure;
		break;
	default:
		break;
	}

	return 0;

nla_put_failure:
	return -1;
}

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CommitProp
Pablo Neira Ayuso
85
95.51%
1
33.33%
Patrick McHardy
2
2.25%
1
33.33%
David S. Miller
2
2.25%
1
33.33%
Total
89
100.00%
3
100.00%


static struct nft_expr_type nft_reject_inet_type;

static const struct nft_expr_ops nft_reject_inet_ops = {
	.type		= &nft_reject_inet_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_reject)),
	.eval		= nft_reject_inet_eval,
	.init		= nft_reject_inet_init,
	.dump		= nft_reject_inet_dump,
	.validate	= nft_reject_validate,
};


static struct nft_expr_type nft_reject_inet_type __read_mostly = {
	.family		= NFPROTO_INET,
	.name		= "reject",
	.ops		= &nft_reject_inet_ops,
	.policy		= nft_reject_policy,
	.maxattr	= NFTA_REJECT_MAX,
	.owner		= THIS_MODULE,
};



static int __init nft_reject_inet_module_init(void)
{
	return nft_register_expr(&nft_reject_inet_type);
}

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16
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1
100.00%



static void __exit nft_reject_inet_module_exit(void)
{
	nft_unregister_expr(&nft_reject_inet_type);
}

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1
100.00%


module_init(nft_reject_inet_module_init);

module_exit(nft_reject_inet_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_AF_EXPR(1, "reject");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Pablo Neira Ayuso
386
62.36%
2
20.00%
Patrick McHardy
216
34.89%
3
30.00%
Eric W. Biedermann
6
0.97%
2
20.00%
Liping Zhang
5
0.81%
1
10.00%
Florian Westphal
4
0.65%
1
10.00%
David S. Miller
2
0.32%
1
10.00%
Total
619
100.00%
10
100.00%
Directory: net/netfilter

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