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05513e9e PM |
1 | /* |
2 | * Copyright (c) 2014 Patrick McHardy <kaber@trash.net> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
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> | |
51b0a5d8 PNA |
17 | #include <net/netfilter/ipv4/nf_reject.h> |
18 | #include <net/netfilter/ipv6/nf_reject.h> | |
05513e9e PM |
19 | |
20 | static void nft_reject_inet_eval(const struct nft_expr *expr, | |
21 | struct nft_data data[NFT_REG_MAX + 1], | |
22 | const struct nft_pktinfo *pkt) | |
23 | { | |
51b0a5d8 PNA |
24 | struct nft_reject *priv = nft_expr_priv(expr); |
25 | struct net *net = dev_net((pkt->in != NULL) ? pkt->in : pkt->out); | |
26 | ||
05513e9e PM |
27 | switch (pkt->ops->pf) { |
28 | case NFPROTO_IPV4: | |
51b0a5d8 PNA |
29 | switch (priv->type) { |
30 | case NFT_REJECT_ICMP_UNREACH: | |
31 | nf_send_unreach(pkt->skb, priv->icmp_code); | |
32 | break; | |
33 | case NFT_REJECT_TCP_RST: | |
34 | nf_send_reset(pkt->skb, pkt->ops->hooknum); | |
35 | break; | |
36 | case NFT_REJECT_ICMPX_UNREACH: | |
37 | nf_send_unreach(pkt->skb, | |
38 | nft_reject_icmp_code(priv->icmp_code)); | |
39 | break; | |
40 | } | |
41 | break; | |
05513e9e | 42 | case NFPROTO_IPV6: |
51b0a5d8 PNA |
43 | switch (priv->type) { |
44 | case NFT_REJECT_ICMP_UNREACH: | |
45 | nf_send_unreach6(net, pkt->skb, priv->icmp_code, | |
46 | pkt->ops->hooknum); | |
47 | break; | |
48 | case NFT_REJECT_TCP_RST: | |
49 | nf_send_reset6(net, pkt->skb, pkt->ops->hooknum); | |
50 | break; | |
51 | case NFT_REJECT_ICMPX_UNREACH: | |
52 | nf_send_unreach6(net, pkt->skb, | |
53 | nft_reject_icmpv6_code(priv->icmp_code), | |
54 | pkt->ops->hooknum); | |
55 | break; | |
56 | } | |
57 | break; | |
58 | } | |
59 | data[NFT_REG_VERDICT].verdict = NF_DROP; | |
60 | } | |
61 | ||
62 | static int nft_reject_inet_init(const struct nft_ctx *ctx, | |
63 | const struct nft_expr *expr, | |
64 | const struct nlattr * const tb[]) | |
65 | { | |
66 | struct nft_reject *priv = nft_expr_priv(expr); | |
67 | int icmp_code; | |
68 | ||
69 | if (tb[NFTA_REJECT_TYPE] == NULL) | |
70 | return -EINVAL; | |
71 | ||
72 | priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE])); | |
73 | switch (priv->type) { | |
74 | case NFT_REJECT_ICMP_UNREACH: | |
75 | case NFT_REJECT_ICMPX_UNREACH: | |
76 | if (tb[NFTA_REJECT_ICMP_CODE] == NULL) | |
77 | return -EINVAL; | |
78 | ||
79 | icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]); | |
80 | if (priv->type == NFT_REJECT_ICMPX_UNREACH && | |
81 | icmp_code > NFT_REJECT_ICMPX_MAX) | |
82 | return -EINVAL; | |
83 | ||
84 | priv->icmp_code = icmp_code; | |
85 | break; | |
86 | case NFT_REJECT_TCP_RST: | |
87 | break; | |
88 | default: | |
89 | return -EINVAL; | |
05513e9e | 90 | } |
51b0a5d8 PNA |
91 | return 0; |
92 | } | |
93 | ||
94 | static int nft_reject_inet_dump(struct sk_buff *skb, | |
95 | const struct nft_expr *expr) | |
96 | { | |
97 | const struct nft_reject *priv = nft_expr_priv(expr); | |
98 | ||
99 | if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type))) | |
100 | goto nla_put_failure; | |
101 | ||
102 | switch (priv->type) { | |
103 | case NFT_REJECT_ICMP_UNREACH: | |
104 | case NFT_REJECT_ICMPX_UNREACH: | |
105 | if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code)) | |
106 | goto nla_put_failure; | |
107 | break; | |
108 | } | |
109 | ||
110 | return 0; | |
111 | ||
112 | nla_put_failure: | |
113 | return -1; | |
05513e9e PM |
114 | } |
115 | ||
116 | static struct nft_expr_type nft_reject_inet_type; | |
117 | static const struct nft_expr_ops nft_reject_inet_ops = { | |
118 | .type = &nft_reject_inet_type, | |
119 | .size = NFT_EXPR_SIZE(sizeof(struct nft_reject)), | |
120 | .eval = nft_reject_inet_eval, | |
51b0a5d8 PNA |
121 | .init = nft_reject_inet_init, |
122 | .dump = nft_reject_inet_dump, | |
05513e9e PM |
123 | }; |
124 | ||
125 | static struct nft_expr_type nft_reject_inet_type __read_mostly = { | |
126 | .family = NFPROTO_INET, | |
127 | .name = "reject", | |
128 | .ops = &nft_reject_inet_ops, | |
129 | .policy = nft_reject_policy, | |
130 | .maxattr = NFTA_REJECT_MAX, | |
131 | .owner = THIS_MODULE, | |
132 | }; | |
133 | ||
134 | static int __init nft_reject_inet_module_init(void) | |
135 | { | |
136 | return nft_register_expr(&nft_reject_inet_type); | |
137 | } | |
138 | ||
139 | static void __exit nft_reject_inet_module_exit(void) | |
140 | { | |
141 | nft_unregister_expr(&nft_reject_inet_type); | |
142 | } | |
143 | ||
144 | module_init(nft_reject_inet_module_init); | |
145 | module_exit(nft_reject_inet_module_exit); | |
146 | ||
147 | MODULE_LICENSE("GPL"); | |
148 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
149 | MODULE_ALIAS_NFT_AF_EXPR(1, "reject"); |