diff options
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/Kconfig | 1 | ||||
| -rw-r--r-- | net/netfilter/Makefile | 2 | ||||
| -rw-r--r-- | net/netfilter/nft_chain_nat.c | 108 |
3 files changed, 111 insertions, 0 deletions
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index 537f23a8ed52..d43ffb09939b 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -550,6 +550,7 @@ config NFT_REDIR config NFT_NAT depends on NF_CONNTRACK select NF_NAT + depends on NF_TABLES_IPV4 || NF_TABLES_IPV6 tristate "Netfilter nf_tables nat module" help This option adds the "nat" expression that you can use to perform diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index c7910706f8dd..4894a85cdd0b 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -110,6 +110,8 @@ obj-$(CONFIG_NFT_OSF) += nft_osf.o obj-$(CONFIG_NFT_TPROXY) += nft_tproxy.o obj-$(CONFIG_NFT_XFRM) += nft_xfrm.o +obj-$(CONFIG_NFT_NAT) += nft_chain_nat.o + # nf_tables netdev obj-$(CONFIG_NFT_DUP_NETDEV) += nft_dup_netdev.o obj-$(CONFIG_NFT_FWD_NETDEV) += nft_fwd_netdev.o diff --git a/net/netfilter/nft_chain_nat.c b/net/netfilter/nft_chain_nat.c new file mode 100644 index 000000000000..ee4852088d50 --- /dev/null +++ b/net/netfilter/nft_chain_nat.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/module.h> +#include <linux/netfilter/nf_tables.h> +#include <net/netfilter/nf_nat.h> +#include <net/netfilter/nf_tables.h> +#include <net/netfilter/nf_tables_ipv4.h> +#include <net/netfilter/nf_tables_ipv6.h> + +static unsigned int nft_nat_do_chain(void *priv, struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct nft_pktinfo pkt; + + nft_set_pktinfo(&pkt, skb, state); + + switch (state->pf) { +#ifdef CONFIG_NF_TABLES_IPV4 + case NFPROTO_IPV4: + nft_set_pktinfo_ipv4(&pkt, skb); + break; +#endif +#ifdef CONFIG_NF_TABLES_IPV6 + case NFPROTO_IPV6: + nft_set_pktinfo_ipv6(&pkt, skb); + break; +#endif + default: + break; + } + + return nft_do_chain(&pkt, priv); +} + +#ifdef CONFIG_NF_TABLES_IPV4 +static const struct nft_chain_type nft_chain_nat_ipv4 = { + .name = "nat", + .type = NFT_CHAIN_T_NAT, + .family = NFPROTO_IPV4, + .owner = THIS_MODULE, + .hook_mask = (1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_POST_ROUTING) | + (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_LOCAL_IN), + .hooks = { + [NF_INET_PRE_ROUTING] = nft_nat_do_chain, + [NF_INET_POST_ROUTING] = nft_nat_do_chain, + [NF_INET_LOCAL_OUT] = nft_nat_do_chain, + [NF_INET_LOCAL_IN] = nft_nat_do_chain, + }, + .ops_register = nf_nat_ipv4_register_fn, + .ops_unregister = nf_nat_ipv4_unregister_fn, +}; +#endif + +#ifdef CONFIG_NF_TABLES_IPV6 +static const struct nft_chain_type nft_chain_nat_ipv6 = { + .name = "nat", + .type = NFT_CHAIN_T_NAT, + .family = NFPROTO_IPV6, + .owner = THIS_MODULE, + .hook_mask = (1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_POST_ROUTING) | + (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_LOCAL_IN), + .hooks = { + [NF_INET_PRE_ROUTING] = nft_nat_do_chain, + [NF_INET_POST_ROUTING] = nft_nat_do_chain, + [NF_INET_LOCAL_OUT] = nft_nat_do_chain, + [NF_INET_LOCAL_IN] = nft_nat_do_chain, + }, + .ops_register = nf_nat_ipv6_register_fn, + .ops_unregister = nf_nat_ipv6_unregister_fn, +}; +#endif + +static int __init nft_chain_nat_init(void) +{ +#ifdef CONFIG_NF_TABLES_IPV6 + nft_register_chain_type(&nft_chain_nat_ipv6); +#endif +#ifdef CONFIG_NF_TABLES_IPV4 + nft_register_chain_type(&nft_chain_nat_ipv4); +#endif + + return 0; +} + +static void __exit nft_chain_nat_exit(void) +{ +#ifdef CONFIG_NF_TABLES_IPV4 + nft_unregister_chain_type(&nft_chain_nat_ipv4); +#endif +#ifdef CONFIG_NF_TABLES_IPV6 + nft_unregister_chain_type(&nft_chain_nat_ipv6); +#endif +} + +module_init(nft_chain_nat_init); +module_exit(nft_chain_nat_exit); + +MODULE_LICENSE("GPL"); +#ifdef CONFIG_NF_TABLES_IPV4 +MODULE_ALIAS_NFT_CHAIN(AF_INET, "nat"); +#endif +#ifdef CONFIG_NF_TABLES_IPV6 +MODULE_ALIAS_NFT_CHAIN(AF_INET6, "nat"); +#endif |