2 * Copyright (c) 2014 Patrick McHardy <kaber@trash.net>
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.
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/ipv4/nf_reject.h>
18 #include <net/netfilter/ipv6/nf_reject.h>
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)
24 struct nft_reject *priv = nft_expr_priv(expr);
25 struct net *net = dev_net((pkt->in != NULL) ? pkt->in : pkt->out);
27 switch (pkt->ops->pf) {
30 case NFT_REJECT_ICMP_UNREACH:
31 nf_send_unreach(pkt->skb, priv->icmp_code);
33 case NFT_REJECT_TCP_RST:
34 nf_send_reset(pkt->skb, pkt->ops->hooknum);
36 case NFT_REJECT_ICMPX_UNREACH:
37 nf_send_unreach(pkt->skb,
38 nft_reject_icmp_code(priv->icmp_code));
44 case NFT_REJECT_ICMP_UNREACH:
45 nf_send_unreach6(net, pkt->skb, priv->icmp_code,
48 case NFT_REJECT_TCP_RST:
49 nf_send_reset6(net, pkt->skb, pkt->ops->hooknum);
51 case NFT_REJECT_ICMPX_UNREACH:
52 nf_send_unreach6(net, pkt->skb,
53 nft_reject_icmpv6_code(priv->icmp_code),
59 data[NFT_REG_VERDICT].verdict = NF_DROP;
62 static int nft_reject_inet_init(const struct nft_ctx *ctx,
63 const struct nft_expr *expr,
64 const struct nlattr * const tb[])
66 struct nft_reject *priv = nft_expr_priv(expr);
69 if (tb[NFTA_REJECT_TYPE] == NULL)
72 priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
74 case NFT_REJECT_ICMP_UNREACH:
75 case NFT_REJECT_ICMPX_UNREACH:
76 if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
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)
84 priv->icmp_code = icmp_code;
86 case NFT_REJECT_TCP_RST:
94 static int nft_reject_inet_dump(struct sk_buff *skb,
95 const struct nft_expr *expr)
97 const struct nft_reject *priv = nft_expr_priv(expr);
99 if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
100 goto nla_put_failure;
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;
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,
121 .init = nft_reject_inet_init,
122 .dump = nft_reject_inet_dump,
125 static struct nft_expr_type nft_reject_inet_type __read_mostly = {
126 .family = NFPROTO_INET,
128 .ops = &nft_reject_inet_ops,
129 .policy = nft_reject_policy,
130 .maxattr = NFTA_REJECT_MAX,
131 .owner = THIS_MODULE,
134 static int __init nft_reject_inet_module_init(void)
136 return nft_register_expr(&nft_reject_inet_type);
139 static void __exit nft_reject_inet_module_exit(void)
141 nft_unregister_expr(&nft_reject_inet_type);
144 module_init(nft_reject_inet_module_init);
145 module_exit(nft_reject_inet_module_exit);
147 MODULE_LICENSE("GPL");
148 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
149 MODULE_ALIAS_NFT_AF_EXPR(1, "reject");