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/nft_masq.h>
17 #include <net/netfilter/ipv4/nf_nat_masquerade.h>
19 static void nft_masq_ipv4_eval(const struct nft_expr
*expr
,
20 struct nft_regs
*regs
,
21 const struct nft_pktinfo
*pkt
)
23 struct nft_masq
*priv
= nft_expr_priv(expr
);
24 struct nf_nat_range range
;
26 memset(&range
, 0, sizeof(range
));
27 range
.flags
= priv
->flags
;
28 if (priv
->sreg_proto_min
) {
30 *(__be16
*)®s
->data
[priv
->sreg_proto_min
];
32 *(__be16
*)®s
->data
[priv
->sreg_proto_max
];
34 regs
->verdict
.code
= nf_nat_masquerade_ipv4(pkt
->skb
, nft_hook(pkt
),
35 &range
, nft_out(pkt
));
39 nft_masq_ipv4_destroy(const struct nft_ctx
*ctx
, const struct nft_expr
*expr
)
41 nf_ct_netns_put(ctx
->net
, NFPROTO_IPV4
);
44 static struct nft_expr_type nft_masq_ipv4_type
;
45 static const struct nft_expr_ops nft_masq_ipv4_ops
= {
46 .type
= &nft_masq_ipv4_type
,
47 .size
= NFT_EXPR_SIZE(sizeof(struct nft_masq
)),
48 .eval
= nft_masq_ipv4_eval
,
49 .init
= nft_masq_init
,
50 .destroy
= nft_masq_ipv4_destroy
,
51 .dump
= nft_masq_dump
,
52 .validate
= nft_masq_validate
,
55 static struct nft_expr_type nft_masq_ipv4_type __read_mostly
= {
56 .family
= NFPROTO_IPV4
,
58 .ops
= &nft_masq_ipv4_ops
,
59 .policy
= nft_masq_policy
,
60 .maxattr
= NFTA_MASQ_MAX
,
64 static int __init
nft_masq_ipv4_module_init(void)
68 ret
= nft_register_expr(&nft_masq_ipv4_type
);
72 nf_nat_masquerade_ipv4_register_notifier();
77 static void __exit
nft_masq_ipv4_module_exit(void)
79 nft_unregister_expr(&nft_masq_ipv4_type
);
80 nf_nat_masquerade_ipv4_unregister_notifier();
83 module_init(nft_masq_ipv4_module_init
);
84 module_exit(nft_masq_ipv4_module_exit
);
86 MODULE_LICENSE("GPL");
87 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org");
88 MODULE_ALIAS_NFT_AF_EXPR(AF_INET
, "masq");