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9ba1f726 AB |
1 | /* |
2 | * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> | |
3 | * | |
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. | |
7 | */ | |
8 | ||
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> | |
18 | ||
19 | static void nft_masq_ipv4_eval(const struct nft_expr *expr, | |
20 | struct nft_data data[NFT_REG_MAX + 1], | |
21 | const struct nft_pktinfo *pkt) | |
22 | { | |
23 | struct nft_masq *priv = nft_expr_priv(expr); | |
24 | struct nf_nat_range range; | |
25 | unsigned int verdict; | |
26 | ||
6b96686e | 27 | memset(&range, 0, sizeof(range)); |
9ba1f726 AB |
28 | range.flags = priv->flags; |
29 | ||
30 | verdict = nf_nat_masquerade_ipv4(pkt->skb, pkt->ops->hooknum, | |
31 | &range, pkt->out); | |
32 | ||
33 | data[NFT_REG_VERDICT].verdict = verdict; | |
34 | } | |
35 | ||
9ba1f726 AB |
36 | static struct nft_expr_type nft_masq_ipv4_type; |
37 | static const struct nft_expr_ops nft_masq_ipv4_ops = { | |
38 | .type = &nft_masq_ipv4_type, | |
39 | .size = NFT_EXPR_SIZE(sizeof(struct nft_masq)), | |
40 | .eval = nft_masq_ipv4_eval, | |
8da4cc1b | 41 | .init = nft_masq_init, |
9ba1f726 | 42 | .dump = nft_masq_dump, |
7210e4e3 | 43 | .validate = nft_masq_validate, |
9ba1f726 AB |
44 | }; |
45 | ||
46 | static struct nft_expr_type nft_masq_ipv4_type __read_mostly = { | |
47 | .family = NFPROTO_IPV4, | |
48 | .name = "masq", | |
49 | .ops = &nft_masq_ipv4_ops, | |
50 | .policy = nft_masq_policy, | |
51 | .maxattr = NFTA_MASQ_MAX, | |
52 | .owner = THIS_MODULE, | |
53 | }; | |
54 | ||
55 | static int __init nft_masq_ipv4_module_init(void) | |
56 | { | |
8da4cc1b AB |
57 | int ret; |
58 | ||
59 | ret = nft_register_expr(&nft_masq_ipv4_type); | |
60 | if (ret < 0) | |
61 | return ret; | |
62 | ||
63 | nf_nat_masquerade_ipv4_register_notifier(); | |
64 | ||
65 | return ret; | |
9ba1f726 AB |
66 | } |
67 | ||
68 | static void __exit nft_masq_ipv4_module_exit(void) | |
69 | { | |
70 | nft_unregister_expr(&nft_masq_ipv4_type); | |
8da4cc1b | 71 | nf_nat_masquerade_ipv4_unregister_notifier(); |
9ba1f726 AB |
72 | } |
73 | ||
74 | module_init(nft_masq_ipv4_module_init); | |
75 | module_exit(nft_masq_ipv4_module_exit); | |
76 | ||
77 | MODULE_LICENSE("GPL"); | |
78 | MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); | |
79 | MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "masq"); |