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_regs
*regs
,
22 const struct nft_pktinfo
*pkt
)
24 struct nft_redir
*priv
= nft_expr_priv(expr
);
25 struct nf_nat_ipv4_multi_range_compat mr
;
27 memset(&mr
, 0, sizeof(mr
));
28 if (priv
->sreg_proto_min
) {
30 *(__be16
*)®s
->data
[priv
->sreg_proto_min
];
32 *(__be16
*)®s
->data
[priv
->sreg_proto_max
];
33 mr
.range
[0].flags
|= NF_NAT_RANGE_PROTO_SPECIFIED
;
36 mr
.range
[0].flags
|= priv
->flags
;
38 regs
->verdict
.code
= nf_nat_redirect_ipv4(pkt
->skb
, &mr
,
42 static struct nft_expr_type nft_redir_ipv4_type
;
43 static const struct nft_expr_ops nft_redir_ipv4_ops
= {
44 .type
= &nft_redir_ipv4_type
,
45 .size
= NFT_EXPR_SIZE(sizeof(struct nft_redir
)),
46 .eval
= nft_redir_ipv4_eval
,
47 .init
= nft_redir_init
,
48 .dump
= nft_redir_dump
,
49 .validate
= nft_redir_validate
,
52 static struct nft_expr_type nft_redir_ipv4_type __read_mostly
= {
53 .family
= NFPROTO_IPV4
,
55 .ops
= &nft_redir_ipv4_ops
,
56 .policy
= nft_redir_policy
,
57 .maxattr
= NFTA_REDIR_MAX
,
61 static int __init
nft_redir_ipv4_module_init(void)
63 return nft_register_expr(&nft_redir_ipv4_type
);
66 static void __exit
nft_redir_ipv4_module_exit(void)
68 nft_unregister_expr(&nft_redir_ipv4_type
);
71 module_init(nft_redir_ipv4_module_init
);
72 module_exit(nft_redir_ipv4_module_exit
);
74 MODULE_LICENSE("GPL");
75 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
76 MODULE_ALIAS_NFT_AF_EXPR(AF_INET
, "redir");