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![Florian Westphal](/assets/img/avatar_default.png)
The functions pass extra skb arg, but either its not used or the helpers can already access it via pkt->skb. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
148 lines
3.6 KiB
C
148 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/module.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_nat.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_tables_ipv6.h>
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static unsigned int nft_nat_do_chain(void *priv, struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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struct nft_pktinfo pkt;
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nft_set_pktinfo(&pkt, skb, state);
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switch (state->pf) {
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#ifdef CONFIG_NF_TABLES_IPV4
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case NFPROTO_IPV4:
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nft_set_pktinfo_ipv4(&pkt);
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break;
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#endif
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#ifdef CONFIG_NF_TABLES_IPV6
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case NFPROTO_IPV6:
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nft_set_pktinfo_ipv6(&pkt);
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break;
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#endif
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default:
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break;
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}
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return nft_do_chain(&pkt, priv);
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}
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#ifdef CONFIG_NF_TABLES_IPV4
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static const struct nft_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_do_chain,
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[NF_INET_POST_ROUTING] = nft_nat_do_chain,
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[NF_INET_LOCAL_OUT] = nft_nat_do_chain,
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[NF_INET_LOCAL_IN] = nft_nat_do_chain,
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},
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.ops_register = nf_nat_ipv4_register_fn,
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.ops_unregister = nf_nat_ipv4_unregister_fn,
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};
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#endif
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#ifdef CONFIG_NF_TABLES_IPV6
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static const struct nft_chain_type nft_chain_nat_ipv6 = {
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.name = "nat",
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.type = NFT_CHAIN_T_NAT,
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.family = NFPROTO_IPV6,
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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_do_chain,
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[NF_INET_POST_ROUTING] = nft_nat_do_chain,
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[NF_INET_LOCAL_OUT] = nft_nat_do_chain,
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[NF_INET_LOCAL_IN] = nft_nat_do_chain,
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},
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.ops_register = nf_nat_ipv6_register_fn,
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.ops_unregister = nf_nat_ipv6_unregister_fn,
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};
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#endif
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#ifdef CONFIG_NF_TABLES_INET
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static int nft_nat_inet_reg(struct net *net, const struct nf_hook_ops *ops)
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{
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return nf_nat_inet_register_fn(net, ops);
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}
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static void nft_nat_inet_unreg(struct net *net, const struct nf_hook_ops *ops)
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{
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nf_nat_inet_unregister_fn(net, ops);
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}
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static const struct nft_chain_type nft_chain_nat_inet = {
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.name = "nat",
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.type = NFT_CHAIN_T_NAT,
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.family = NFPROTO_INET,
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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_LOCAL_IN) |
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(1 << NF_INET_LOCAL_OUT) |
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(1 << NF_INET_POST_ROUTING),
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.hooks = {
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[NF_INET_PRE_ROUTING] = nft_nat_do_chain,
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[NF_INET_LOCAL_IN] = nft_nat_do_chain,
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[NF_INET_LOCAL_OUT] = nft_nat_do_chain,
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[NF_INET_POST_ROUTING] = nft_nat_do_chain,
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},
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.ops_register = nft_nat_inet_reg,
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.ops_unregister = nft_nat_inet_unreg,
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};
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#endif
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static int __init nft_chain_nat_init(void)
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{
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#ifdef CONFIG_NF_TABLES_IPV6
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nft_register_chain_type(&nft_chain_nat_ipv6);
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#endif
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#ifdef CONFIG_NF_TABLES_IPV4
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nft_register_chain_type(&nft_chain_nat_ipv4);
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#endif
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#ifdef CONFIG_NF_TABLES_INET
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nft_register_chain_type(&nft_chain_nat_inet);
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#endif
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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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#ifdef CONFIG_NF_TABLES_IPV4
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nft_unregister_chain_type(&nft_chain_nat_ipv4);
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#endif
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#ifdef CONFIG_NF_TABLES_IPV6
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nft_unregister_chain_type(&nft_chain_nat_ipv6);
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#endif
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#ifdef CONFIG_NF_TABLES_INET
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nft_unregister_chain_type(&nft_chain_nat_inet);
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#endif
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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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#ifdef CONFIG_NF_TABLES_IPV4
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MODULE_ALIAS_NFT_CHAIN(AF_INET, "nat");
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#endif
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#ifdef CONFIG_NF_TABLES_IPV6
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MODULE_ALIAS_NFT_CHAIN(AF_INET6, "nat");
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#endif
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#ifdef CONFIG_NF_TABLES_INET
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MODULE_ALIAS_NFT_CHAIN(1, "nat"); /* NFPROTO_INET */
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#endif
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