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/ipv4/nf_reject.h> |
17 | #include <net/netfilter/nft_reject.h> |
18 | |
19 | static void nft_reject_ipv4_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_unreach(skb_in: pkt->skb, code: priv->icmp_code, hook: nft_hook(pkt)); |
28 | break; |
29 | case NFT_REJECT_TCP_RST: |
30 | nf_send_reset(net: nft_net(pkt), nft_sk(pkt), oldskb: pkt->skb, |
31 | hook: nft_hook(pkt)); |
32 | break; |
33 | default: |
34 | break; |
35 | } |
36 | |
37 | regs->verdict.code = NF_DROP; |
38 | } |
39 | |
40 | static struct nft_expr_type nft_reject_ipv4_type; |
41 | static const struct nft_expr_ops nft_reject_ipv4_ops = { |
42 | .type = &nft_reject_ipv4_type, |
43 | .size = NFT_EXPR_SIZE(sizeof(struct nft_reject)), |
44 | .eval = nft_reject_ipv4_eval, |
45 | .init = nft_reject_init, |
46 | .dump = nft_reject_dump, |
47 | .validate = nft_reject_validate, |
48 | .reduce = NFT_REDUCE_READONLY, |
49 | }; |
50 | |
51 | static struct nft_expr_type nft_reject_ipv4_type __read_mostly = { |
52 | .family = NFPROTO_IPV4, |
53 | .name = "reject" , |
54 | .ops = &nft_reject_ipv4_ops, |
55 | .policy = nft_reject_policy, |
56 | .maxattr = NFTA_REJECT_MAX, |
57 | .owner = THIS_MODULE, |
58 | }; |
59 | |
60 | static int __init nft_reject_ipv4_module_init(void) |
61 | { |
62 | return nft_register_expr(&nft_reject_ipv4_type); |
63 | } |
64 | |
65 | static void __exit nft_reject_ipv4_module_exit(void) |
66 | { |
67 | nft_unregister_expr(&nft_reject_ipv4_type); |
68 | } |
69 | |
70 | module_init(nft_reject_ipv4_module_init); |
71 | module_exit(nft_reject_ipv4_module_exit); |
72 | |
73 | MODULE_LICENSE("GPL" ); |
74 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>" ); |
75 | MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "reject" ); |
76 | MODULE_DESCRIPTION("IPv4 packet rejection for nftables" ); |
77 | |