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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, | |
a55e22e9 | 20 | struct nft_regs *regs, |
9ba1f726 AB |
21 | const struct nft_pktinfo *pkt) |
22 | { | |
23 | struct nft_masq *priv = nft_expr_priv(expr); | |
24 | struct nf_nat_range range; | |
9ba1f726 | 25 | |
6b96686e | 26 | memset(&range, 0, sizeof(range)); |
9ba1f726 | 27 | range.flags = priv->flags; |
8a6bf5da PNA |
28 | if (priv->sreg_proto_min) { |
29 | range.min_proto.all = | |
30 | *(__be16 *)®s->data[priv->sreg_proto_min]; | |
31 | range.max_proto.all = | |
32 | *(__be16 *)®s->data[priv->sreg_proto_max]; | |
33 | } | |
6aa187f2 | 34 | regs->verdict.code = nf_nat_masquerade_ipv4(pkt->skb, pkt->hook, |
a55e22e9 | 35 | &range, pkt->out); |
9ba1f726 AB |
36 | } |
37 | ||
9ba1f726 AB |
38 | static struct nft_expr_type nft_masq_ipv4_type; |
39 | static const struct nft_expr_ops nft_masq_ipv4_ops = { | |
40 | .type = &nft_masq_ipv4_type, | |
41 | .size = NFT_EXPR_SIZE(sizeof(struct nft_masq)), | |
42 | .eval = nft_masq_ipv4_eval, | |
8da4cc1b | 43 | .init = nft_masq_init, |
9ba1f726 | 44 | .dump = nft_masq_dump, |
7210e4e3 | 45 | .validate = nft_masq_validate, |
9ba1f726 AB |
46 | }; |
47 | ||
48 | static struct nft_expr_type nft_masq_ipv4_type __read_mostly = { | |
49 | .family = NFPROTO_IPV4, | |
50 | .name = "masq", | |
51 | .ops = &nft_masq_ipv4_ops, | |
52 | .policy = nft_masq_policy, | |
53 | .maxattr = NFTA_MASQ_MAX, | |
54 | .owner = THIS_MODULE, | |
55 | }; | |
56 | ||
57 | static int __init nft_masq_ipv4_module_init(void) | |
58 | { | |
8da4cc1b AB |
59 | int ret; |
60 | ||
61 | ret = nft_register_expr(&nft_masq_ipv4_type); | |
62 | if (ret < 0) | |
63 | return ret; | |
64 | ||
65 | nf_nat_masquerade_ipv4_register_notifier(); | |
66 | ||
67 | return ret; | |
9ba1f726 AB |
68 | } |
69 | ||
70 | static void __exit nft_masq_ipv4_module_exit(void) | |
71 | { | |
72 | nft_unregister_expr(&nft_masq_ipv4_type); | |
8da4cc1b | 73 | nf_nat_masquerade_ipv4_unregister_notifier(); |
9ba1f726 AB |
74 | } |
75 | ||
76 | module_init(nft_masq_ipv4_module_init); | |
77 | module_exit(nft_masq_ipv4_module_exit); | |
78 | ||
79 | MODULE_LICENSE("GPL"); | |
80 | MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); | |
81 | MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "masq"); |