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 | |
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(net: nft_net(pkt), skb_in: pkt->skb, code: priv->icmp_code, |
28 | hooknum: nft_hook(pkt)); |
29 | break; |
30 | case NFT_REJECT_TCP_RST: |
31 | nf_send_reset6(net: nft_net(pkt), sk: nft_sk(pkt), oldskb: pkt->skb, |
32 | hook: 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 | |
61 | static int __init nft_reject_ipv6_module_init(void) |
62 | { |
63 | return nft_register_expr(&nft_reject_ipv6_type); |
64 | } |
65 | |
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 | |