diff options
| author | Florian Westphal <fw@strlen.de> | 2019-02-28 12:02:52 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2019-03-01 14:36:59 +0100 |
| commit | db8ab38880e06dedbfc879e75f5b0ddc495f4eb6 (patch) | |
| tree | 91d214eda567b0608b88e4b4f8e5bbd2d353ac0a /net/netfilter/nft_chain_nat.c | |
| parent | a9ce849e786787af4b7dffd48d49b97b04671f8c (diff) | |
netfilter: nf_tables: merge ipv4 and ipv6 nat chain types
Merge the ipv4 and ipv6 nat chain type. This is the last
missing piece which allows to provide inet family support
for nat in a follow patch.
The kconfig knobs for ipv4/ipv6 nat chain are removed, the
nat chain type will be built unconditionally if NFT_NAT
expression is enabled.
Before:
text data bss dec hex filename
1576 896 0 2472 9a8 nft_chain_nat_ipv4.ko
1697 896 0 2593 a21 nft_chain_nat_ipv6.ko
After:
text data bss dec hex filename
1832 896 0 2728 aa8 nft_chain_nat.ko
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nft_chain_nat.c')
| -rw-r--r-- | net/netfilter/nft_chain_nat.c | 108 |
1 files changed, 108 insertions, 0 deletions
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 |