65cd90ac76
Use the exported IPv4 NAT functions that are provided by the core. This removes duplicated code so iptables and nft use the same NAT codebase. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
117 lines
3.2 KiB
C
117 lines
3.2 KiB
C
/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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* Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
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* Copyright (c) 2012 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_nat.h>
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#include <net/netfilter/nf_nat_core.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_ipv4.h>
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#include <net/netfilter/nf_nat_l3proto.h>
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#include <net/ip.h>
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static unsigned int nft_nat_do_chain(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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struct nf_conn *ct)
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{
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struct nft_pktinfo pkt;
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nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
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return nft_do_chain(&pkt, ops);
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}
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static unsigned int nft_nat_ipv4_fn(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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return nf_nat_ipv4_fn(ops, skb, in, out, nft_nat_do_chain);
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}
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static unsigned int nft_nat_ipv4_in(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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return nf_nat_ipv4_in(ops, skb, in, out, nft_nat_do_chain);
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}
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static unsigned int nft_nat_ipv4_out(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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return nf_nat_ipv4_out(ops, skb, in, out, nft_nat_do_chain);
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}
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static unsigned int nft_nat_ipv4_local_fn(const struct nf_hook_ops *ops,
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struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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return nf_nat_ipv4_local_fn(ops, skb, in, out, nft_nat_do_chain);
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}
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static const struct nf_chain_type nft_chain_nat_ipv4 = {
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.name = "nat",
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.type = NFT_CHAIN_T_NAT,
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.family = NFPROTO_IPV4,
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.owner = THIS_MODULE,
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.hook_mask = (1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_POST_ROUTING) |
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(1 << NF_INET_LOCAL_OUT) |
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(1 << NF_INET_LOCAL_IN),
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.hooks = {
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[NF_INET_PRE_ROUTING] = nft_nat_ipv4_in,
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[NF_INET_POST_ROUTING] = nft_nat_ipv4_out,
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[NF_INET_LOCAL_OUT] = nft_nat_ipv4_local_fn,
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[NF_INET_LOCAL_IN] = nft_nat_ipv4_fn,
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},
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};
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static int __init nft_chain_nat_init(void)
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{
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int err;
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err = nft_register_chain_type(&nft_chain_nat_ipv4);
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if (err < 0)
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return err;
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return 0;
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}
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static void __exit nft_chain_nat_exit(void)
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{
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nft_unregister_chain_type(&nft_chain_nat_ipv4);
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}
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module_init(nft_chain_nat_init);
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module_exit(nft_chain_nat_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_ALIAS_NFT_CHAIN(AF_INET, "nat");
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