1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
4 * Copyright (c) 2013 Eric Leblond <eric@regit.org>
5 *
6 * Development of this code funded by Astaro AG (http://www.astaro.com/)
7 */
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/netlink.h>
13#include <linux/netfilter.h>
14#include <linux/netfilter/nf_tables.h>
15#include <net/netfilter/nf_tables.h>
16#include <net/netfilter/nft_reject.h>
17#include <net/netfilter/ipv6/nf_reject.h>
18
19static void nft_reject_ipv6_eval(const struct nft_expr *expr,
20				 struct nft_regs *regs,
21				 const struct nft_pktinfo *pkt)
22{
23	struct nft_reject *priv = nft_expr_priv(expr);
24
25	switch (priv->type) {
26	case NFT_REJECT_ICMP_UNREACH:
27		nf_send_unreach6(nft_net(pkt), pkt->skb, priv->icmp_code,
28				 nft_hook(pkt));
29		break;
30	case NFT_REJECT_TCP_RST:
31		nf_send_reset6(nft_net(pkt), nft_sk(pkt), pkt->skb,
32			       nft_hook(pkt));
33		break;
34	default:
35		break;
36	}
37
38	regs->verdict.code = NF_DROP;
39}
40
41static struct nft_expr_type nft_reject_ipv6_type;
42static const struct nft_expr_ops nft_reject_ipv6_ops = {
43	.type		= &nft_reject_ipv6_type,
44	.size		= NFT_EXPR_SIZE(sizeof(struct nft_reject)),
45	.eval		= nft_reject_ipv6_eval,
46	.init		= nft_reject_init,
47	.dump		= nft_reject_dump,
48	.validate	= nft_reject_validate,
49	.reduce		= NFT_REDUCE_READONLY,
50};
51
52static struct nft_expr_type nft_reject_ipv6_type __read_mostly = {
53	.family		= NFPROTO_IPV6,
54	.name		= "reject",
55	.ops		= &nft_reject_ipv6_ops,
56	.policy		= nft_reject_policy,
57	.maxattr	= NFTA_REJECT_MAX,
58	.owner		= THIS_MODULE,
59};
60
61static int __init nft_reject_ipv6_module_init(void)
62{
63	return nft_register_expr(&nft_reject_ipv6_type);
64}
65
66static void __exit nft_reject_ipv6_module_exit(void)
67{
68	nft_unregister_expr(&nft_reject_ipv6_type);
69}
70
71module_init(nft_reject_ipv6_module_init);
72module_exit(nft_reject_ipv6_module_exit);
73
74MODULE_LICENSE("GPL");
75MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
76MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "reject");
77MODULE_DESCRIPTION("IPv6 packet rejection for nftables");
78