1
2
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4
5
6#include <linux/kernel.h>
7#include <linux/init.h>
8#include <linux/module.h>
9#include <linux/netlink.h>
10#include <linux/netfilter.h>
11#include <linux/netfilter/nf_tables.h>
12#include <net/netfilter/nf_tables.h>
13#include <net/netfilter/nft_reject.h>
14#include <net/netfilter/ipv4/nf_reject.h>
15#include <net/netfilter/ipv6/nf_reject.h>
16
17static void nft_reject_inet_eval(const struct nft_expr *expr,
18 struct nft_regs *regs,
19 const struct nft_pktinfo *pkt)
20{
21 struct nft_reject *priv = nft_expr_priv(expr);
22
23 switch (nft_pf(pkt)) {
24 case NFPROTO_IPV4:
25 switch (priv->type) {
26 case NFT_REJECT_ICMP_UNREACH:
27 nf_send_unreach(pkt->skb, priv->icmp_code,
28 nft_hook(pkt));
29 break;
30 case NFT_REJECT_TCP_RST:
31 nf_send_reset(nft_net(pkt), nft_sk(pkt),
32 pkt->skb, nft_hook(pkt));
33 break;
34 case NFT_REJECT_ICMPX_UNREACH:
35 nf_send_unreach(pkt->skb,
36 nft_reject_icmp_code(priv->icmp_code),
37 nft_hook(pkt));
38 break;
39 }
40 break;
41 case NFPROTO_IPV6:
42 switch (priv->type) {
43 case NFT_REJECT_ICMP_UNREACH:
44 nf_send_unreach6(nft_net(pkt), pkt->skb,
45 priv->icmp_code, nft_hook(pkt));
46 break;
47 case NFT_REJECT_TCP_RST:
48 nf_send_reset6(nft_net(pkt), nft_sk(pkt),
49 pkt->skb, nft_hook(pkt));
50 break;
51 case NFT_REJECT_ICMPX_UNREACH:
52 nf_send_unreach6(nft_net(pkt), pkt->skb,
53 nft_reject_icmpv6_code(priv->icmp_code),
54 nft_hook(pkt));
55 break;
56 }
57 break;
58 }
59
60 regs->verdict.code = NF_DROP;
61}
62
63static int nft_reject_inet_validate(const struct nft_ctx *ctx,
64 const struct nft_expr *expr,
65 const struct nft_data **data)
66{
67 return nft_chain_validate_hooks(ctx->chain,
68 (1 << NF_INET_LOCAL_IN) |
69 (1 << NF_INET_FORWARD) |
70 (1 << NF_INET_LOCAL_OUT) |
71 (1 << NF_INET_PRE_ROUTING) |
72 (1 << NF_INET_INGRESS));
73}
74
75static struct nft_expr_type nft_reject_inet_type;
76static const struct nft_expr_ops nft_reject_inet_ops = {
77 .type = &nft_reject_inet_type,
78 .size = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
79 .eval = nft_reject_inet_eval,
80 .init = nft_reject_init,
81 .dump = nft_reject_dump,
82 .validate = nft_reject_inet_validate,
83 .reduce = NFT_REDUCE_READONLY,
84};
85
86static struct nft_expr_type nft_reject_inet_type __read_mostly = {
87 .family = NFPROTO_INET,
88 .name = "reject",
89 .ops = &nft_reject_inet_ops,
90 .policy = nft_reject_policy,
91 .maxattr = NFTA_REJECT_MAX,
92 .owner = THIS_MODULE,
93};
94
95static int __init nft_reject_inet_module_init(void)
96{
97 return nft_register_expr(&nft_reject_inet_type);
98}
99
100static void __exit nft_reject_inet_module_exit(void)
101{
102 nft_unregister_expr(&nft_reject_inet_type);
103}
104
105module_init(nft_reject_inet_module_init);
106module_exit(nft_reject_inet_module_exit);
107
108MODULE_LICENSE("GPL");
109MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
110MODULE_ALIAS_NFT_AF_EXPR(1, "reject");
111MODULE_DESCRIPTION("Netfilter nftables reject inet support");
112
