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