1 /*
2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
3 * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
4 * Copyright (c) 2012 Intel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 */
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/list.h>
16 #include <linux/skbuff.h>
17 #include <linux/ip.h>
18 #include <linux/netfilter.h>
19 #include <linux/netfilter_ipv4.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_conntrack.h>
22 #include <net/netfilter/nf_nat.h>
23 #include <net/netfilter/nf_nat_core.h>
24 #include <net/netfilter/nf_tables.h>
25 #include <net/netfilter/nf_tables_ipv4.h>
26 #include <net/netfilter/nf_nat_l3proto.h>
27 #include <net/ip.h>
28
29 static unsigned int nft_nat_do_chain(void *priv,
30 struct sk_buff *skb,
31 const struct nf_hook_state *state,
32 struct nf_conn *ct)
33 {
34 struct nft_pktinfo pkt;
35
36 nft_set_pktinfo_ipv4(&pkt, skb, state);
37
38 return nft_do_chain(&pkt, priv);
39 }
40
41 static unsigned int nft_nat_ipv4_fn(void *priv,
42 struct sk_buff *skb,
43 const struct nf_hook_state *state)
44 {
45 return nf_nat_ipv4_fn(priv, skb, state, nft_nat_do_chain);
46 }
47
48 static unsigned int nft_nat_ipv4_in(void *priv,
49 struct sk_buff *skb,
50 const struct nf_hook_state *state)
51 {
52 return nf_nat_ipv4_in(priv, skb, state, nft_nat_do_chain);
53 }
54
55 static unsigned int nft_nat_ipv4_out(void *priv,
56 struct sk_buff *skb,
57 const struct nf_hook_state *state)
58 {
59 return nf_nat_ipv4_out(priv, skb, state, nft_nat_do_chain);
60 }
61
62 static unsigned int nft_nat_ipv4_local_fn(void *priv,
63 struct sk_buff *skb,
64 const struct nf_hook_state *state)
65 {
66 return nf_nat_ipv4_local_fn(priv, skb, state, nft_nat_do_chain);
67 }
68
69 static const struct nf_chain_type nft_chain_nat_ipv4 = {
70 .name = "nat",
71 .type = NFT_CHAIN_T_NAT,
72 .family = NFPROTO_IPV4,
73 .owner = THIS_MODULE,
74 .hook_mask = (1 << NF_INET_PRE_ROUTING) |
75 (1 << NF_INET_POST_ROUTING) |
76 (1 << NF_INET_LOCAL_OUT) |
77 (1 << NF_INET_LOCAL_IN),
78 .hooks = {
79 [NF_INET_PRE_ROUTING] = nft_nat_ipv4_in,
80 [NF_INET_POST_ROUTING] = nft_nat_ipv4_out,
81 [NF_INET_LOCAL_OUT] = nft_nat_ipv4_local_fn,
82 [NF_INET_LOCAL_IN] = nft_nat_ipv4_fn,
83 },
84 };
85
86 static int __init nft_chain_nat_init(void)
87 {
88 int err;
89
90 err = nft_register_chain_type(&nft_chain_nat_ipv4);
91 if (err < 0)
92 return err;
93
94 return 0;
95 }
96
97 static void __exit nft_chain_nat_exit(void)
98 {
99 nft_unregister_chain_type(&nft_chain_nat_ipv4);
100 }
101
102 module_init(nft_chain_nat_init);
103 module_exit(nft_chain_nat_exit);
104
105 MODULE_LICENSE("GPL");
106 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
107 MODULE_ALIAS_NFT_CHAIN(AF_INET, "nat");
108
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