2 * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
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
, nft_hook(pkt
));
42 nft_redir_ipv4_destroy(const struct nft_ctx
*ctx
, const struct nft_expr
*expr
)
44 nf_ct_netns_put(ctx
->net
, NFPROTO_IPV4
);
47 static struct nft_expr_type nft_redir_ipv4_type
;
48 static const struct nft_expr_ops nft_redir_ipv4_ops
= {
49 .type
= &nft_redir_ipv4_type
,
50 .size
= NFT_EXPR_SIZE(sizeof(struct nft_redir
)),
51 .eval
= nft_redir_ipv4_eval
,
52 .init
= nft_redir_init
,
53 .destroy
= nft_redir_ipv4_destroy
,
54 .dump
= nft_redir_dump
,
55 .validate
= nft_redir_validate
,
58 static struct nft_expr_type nft_redir_ipv4_type __read_mostly
= {
59 .family
= NFPROTO_IPV4
,
61 .ops
= &nft_redir_ipv4_ops
,
62 .policy
= nft_redir_policy
,
63 .maxattr
= NFTA_REDIR_MAX
,
67 static int __init
nft_redir_ipv4_module_init(void)
69 return nft_register_expr(&nft_redir_ipv4_type
);
72 static void __exit
nft_redir_ipv4_module_exit(void)
74 nft_unregister_expr(&nft_redir_ipv4_type
);
77 module_init(nft_redir_ipv4_module_init
);
78 module_exit(nft_redir_ipv4_module_exit
);
80 MODULE_LICENSE("GPL");
81 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
82 MODULE_ALIAS_NFT_AF_EXPR(AF_INET
, "redir");