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1 | // SPDX-License-Identifier: GPL-2.0-only | |
2 | /* | |
3 | * Copyright (c) 2014 Patrick McHardy <kaber@trash.net> | |
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 | ||
17 | static 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), pkt->skb, nft_hook(pkt)); | |
32 | break; | |
33 | case NFT_REJECT_ICMPX_UNREACH: | |
34 | nf_send_unreach(pkt->skb, | |
35 | nft_reject_icmp_code(priv->icmp_code), | |
36 | nft_hook(pkt)); | |
37 | break; | |
38 | } | |
39 | break; | |
40 | case NFPROTO_IPV6: | |
41 | switch (priv->type) { | |
42 | case NFT_REJECT_ICMP_UNREACH: | |
43 | nf_send_unreach6(nft_net(pkt), pkt->skb, | |
44 | priv->icmp_code, nft_hook(pkt)); | |
45 | break; | |
46 | case NFT_REJECT_TCP_RST: | |
47 | nf_send_reset6(nft_net(pkt), pkt->skb, nft_hook(pkt)); | |
48 | break; | |
49 | case NFT_REJECT_ICMPX_UNREACH: | |
50 | nf_send_unreach6(nft_net(pkt), pkt->skb, | |
51 | nft_reject_icmpv6_code(priv->icmp_code), | |
52 | nft_hook(pkt)); | |
53 | break; | |
54 | } | |
55 | break; | |
56 | } | |
57 | ||
58 | regs->verdict.code = NF_DROP; | |
59 | } | |
60 | ||
61 | static int nft_reject_inet_init(const struct nft_ctx *ctx, | |
62 | const struct nft_expr *expr, | |
63 | const struct nlattr * const tb[]) | |
64 | { | |
65 | struct nft_reject *priv = nft_expr_priv(expr); | |
66 | int icmp_code; | |
67 | ||
68 | if (tb[NFTA_REJECT_TYPE] == NULL) | |
69 | return -EINVAL; | |
70 | ||
71 | priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE])); | |
72 | switch (priv->type) { | |
73 | case NFT_REJECT_ICMP_UNREACH: | |
74 | case NFT_REJECT_ICMPX_UNREACH: | |
75 | if (tb[NFTA_REJECT_ICMP_CODE] == NULL) | |
76 | return -EINVAL; | |
77 | ||
78 | icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]); | |
79 | if (priv->type == NFT_REJECT_ICMPX_UNREACH && | |
80 | icmp_code > NFT_REJECT_ICMPX_MAX) | |
81 | return -EINVAL; | |
82 | ||
83 | priv->icmp_code = icmp_code; | |
84 | break; | |
85 | case NFT_REJECT_TCP_RST: | |
86 | break; | |
87 | default: | |
88 | return -EINVAL; | |
89 | } | |
90 | return 0; | |
91 | } | |
92 | ||
93 | static int nft_reject_inet_dump(struct sk_buff *skb, | |
94 | const struct nft_expr *expr) | |
95 | { | |
96 | const struct nft_reject *priv = nft_expr_priv(expr); | |
97 | ||
98 | if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type))) | |
99 | goto nla_put_failure; | |
100 | ||
101 | switch (priv->type) { | |
102 | case NFT_REJECT_ICMP_UNREACH: | |
103 | case NFT_REJECT_ICMPX_UNREACH: | |
104 | if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code)) | |
105 | goto nla_put_failure; | |
106 | break; | |
107 | default: | |
108 | break; | |
109 | } | |
110 | ||
111 | return 0; | |
112 | ||
113 | nla_put_failure: | |
114 | return -1; | |
115 | } | |
116 | ||
117 | static struct nft_expr_type nft_reject_inet_type; | |
118 | static const struct nft_expr_ops nft_reject_inet_ops = { | |
119 | .type = &nft_reject_inet_type, | |
120 | .size = NFT_EXPR_SIZE(sizeof(struct nft_reject)), | |
121 | .eval = nft_reject_inet_eval, | |
122 | .init = nft_reject_inet_init, | |
123 | .dump = nft_reject_inet_dump, | |
124 | .validate = nft_reject_validate, | |
125 | }; | |
126 | ||
127 | static struct nft_expr_type nft_reject_inet_type __read_mostly = { | |
128 | .family = NFPROTO_INET, | |
129 | .name = "reject", | |
130 | .ops = &nft_reject_inet_ops, | |
131 | .policy = nft_reject_policy, | |
132 | .maxattr = NFTA_REJECT_MAX, | |
133 | .owner = THIS_MODULE, | |
134 | }; | |
135 | ||
136 | static int __init nft_reject_inet_module_init(void) | |
137 | { | |
138 | return nft_register_expr(&nft_reject_inet_type); | |
139 | } | |
140 | ||
141 | static void __exit nft_reject_inet_module_exit(void) | |
142 | { | |
143 | nft_unregister_expr(&nft_reject_inet_type); | |
144 | } | |
145 | ||
146 | module_init(nft_reject_inet_module_init); | |
147 | module_exit(nft_reject_inet_module_exit); | |
148 | ||
149 | MODULE_LICENSE("GPL"); | |
150 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
151 | MODULE_ALIAS_NFT_AF_EXPR(1, "reject"); |