2 * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
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/nf_nat.h>
17 #include <net/netfilter/nf_nat_redirect.h>
18 #include <net/netfilter/nft_redir.h>
20 static void nft_redir_ipv4_eval(const struct nft_expr *expr,
21 struct nft_data data[NFT_REG_MAX + 1],
22 const struct nft_pktinfo *pkt)
24 struct nft_redir *priv = nft_expr_priv(expr);
25 struct nf_nat_ipv4_multi_range_compat mr;
28 memset(&mr, 0, sizeof(mr));
29 if (priv->sreg_proto_min) {
30 mr.range[0].min.all = (__force __be16)
31 data[priv->sreg_proto_min].data[0];
32 mr.range[0].max.all = (__force __be16)
33 data[priv->sreg_proto_max].data[0];
34 mr.range[0].flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
37 mr.range[0].flags |= priv->flags;
39 verdict = nf_nat_redirect_ipv4(pkt->skb, &mr, pkt->ops->hooknum);
40 data[NFT_REG_VERDICT].verdict = verdict;
43 static struct nft_expr_type nft_redir_ipv4_type;
44 static const struct nft_expr_ops nft_redir_ipv4_ops = {
45 .type = &nft_redir_ipv4_type,
46 .size = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
47 .eval = nft_redir_ipv4_eval,
48 .init = nft_redir_init,
49 .dump = nft_redir_dump,
50 .validate = nft_redir_validate,
53 static struct nft_expr_type nft_redir_ipv4_type __read_mostly = {
54 .family = NFPROTO_IPV4,
56 .ops = &nft_redir_ipv4_ops,
57 .policy = nft_redir_policy,
58 .maxattr = NFTA_REDIR_MAX,
62 static int __init nft_redir_ipv4_module_init(void)
64 return nft_register_expr(&nft_redir_ipv4_type);
67 static void __exit nft_redir_ipv4_module_exit(void)
69 nft_unregister_expr(&nft_redir_ipv4_type);
72 module_init(nft_redir_ipv4_module_init);
73 module_exit(nft_redir_ipv4_module_exit);
75 MODULE_LICENSE("GPL");
76 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
77 MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "redir");