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
nft_reject_ipv6_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)19 static 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
41 static struct nft_expr_type nft_reject_ipv6_type;
42 static 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
52 static 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
nft_reject_ipv6_module_init(void)61 static int __init nft_reject_ipv6_module_init(void)
62 {
63 return nft_register_expr(&nft_reject_ipv6_type);
64 }
65
nft_reject_ipv6_module_exit(void)66 static void __exit nft_reject_ipv6_module_exit(void)
67 {
68 nft_unregister_expr(&nft_reject_ipv6_type);
69 }
70
71 module_init(nft_reject_ipv6_module_init);
72 module_exit(nft_reject_ipv6_module_exit);
73
74 MODULE_LICENSE("GPL");
75 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
76 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "reject");
77 MODULE_DESCRIPTION("IPv6 packet rejection for nftables");
78