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Commit | Line | Data |
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9ba1f726 | 1 | /* |
cd727514 | 2 | * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org> |
9ba1f726 AB |
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 | 28 | if (priv->sreg_proto_min) { |
10596608 LZ |
29 | range.min_proto.all = (__force __be16)nft_reg_load16( |
30 | ®s->data[priv->sreg_proto_min]); | |
31 | range.max_proto.all = (__force __be16)nft_reg_load16( | |
32 | ®s->data[priv->sreg_proto_max]); | |
8a6bf5da | 33 | } |
0e5a1c7e PNA |
34 | regs->verdict.code = nf_nat_masquerade_ipv4(pkt->skb, nft_hook(pkt), |
35 | &range, nft_out(pkt)); | |
9ba1f726 AB |
36 | } |
37 | ||
20afd423 FW |
38 | static void |
39 | nft_masq_ipv4_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) | |
40 | { | |
41 | nf_ct_netns_put(ctx->net, NFPROTO_IPV4); | |
42 | } | |
43 | ||
9ba1f726 AB |
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, | |
8da4cc1b | 49 | .init = nft_masq_init, |
20afd423 | 50 | .destroy = nft_masq_ipv4_destroy, |
9ba1f726 | 51 | .dump = nft_masq_dump, |
7210e4e3 | 52 | .validate = nft_masq_validate, |
9ba1f726 AB |
53 | }; |
54 | ||
55 | static struct nft_expr_type nft_masq_ipv4_type __read_mostly = { | |
56 | .family = NFPROTO_IPV4, | |
57 | .name = "masq", | |
58 | .ops = &nft_masq_ipv4_ops, | |
59 | .policy = nft_masq_policy, | |
60 | .maxattr = NFTA_MASQ_MAX, | |
61 | .owner = THIS_MODULE, | |
62 | }; | |
63 | ||
64 | static int __init nft_masq_ipv4_module_init(void) | |
65 | { | |
8da4cc1b AB |
66 | int ret; |
67 | ||
68 | ret = nft_register_expr(&nft_masq_ipv4_type); | |
69 | if (ret < 0) | |
70 | return ret; | |
71 | ||
72 | nf_nat_masquerade_ipv4_register_notifier(); | |
73 | ||
74 | return ret; | |
9ba1f726 AB |
75 | } |
76 | ||
77 | static void __exit nft_masq_ipv4_module_exit(void) | |
78 | { | |
79 | nft_unregister_expr(&nft_masq_ipv4_type); | |
8da4cc1b | 80 | nf_nat_masquerade_ipv4_unregister_notifier(); |
9ba1f726 AB |
81 | } |
82 | ||
83 | module_init(nft_masq_ipv4_module_init); | |
84 | module_exit(nft_masq_ipv4_module_exit); | |
85 | ||
86 | MODULE_LICENSE("GPL"); | |
cd727514 | 87 | MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org"); |
9ba1f726 | 88 | MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "masq"); |