| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _NF_NAT_H |
| #define _NF_NAT_H |
| |
| #include <linux/list.h> |
| #include <linux/netfilter_ipv4.h> |
| #include <linux/netfilter/nf_conntrack_pptp.h> |
| #include <net/netfilter/nf_conntrack.h> |
| #include <net/netfilter/nf_conntrack_extend.h> |
| #include <net/netfilter/nf_conntrack_tuple.h> |
| #include <uapi/linux/netfilter/nf_nat.h> |
| |
| enum nf_nat_manip_type { |
| NF_NAT_MANIP_SRC, |
| NF_NAT_MANIP_DST |
| }; |
| |
| /* SRC manip occurs POST_ROUTING or LOCAL_IN */ |
| #define HOOK2MANIP(hooknum) ((hooknum) != NF_INET_POST_ROUTING && \ |
| (hooknum) != NF_INET_LOCAL_IN) |
| |
| /* per conntrack: nat application helper private data */ |
| union nf_conntrack_nat_help { |
| /* insert nat helper private data here */ |
| #if IS_ENABLED(CONFIG_NF_NAT_PPTP) |
| struct nf_nat_pptp nat_pptp_info; |
| #endif |
| }; |
| |
| /* The structure embedded in the conntrack structure. */ |
| struct nf_conn_nat { |
| union nf_conntrack_nat_help help; |
| #if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE) |
| int masq_index; |
| #endif |
| }; |
| |
| /* Set up the info structure to map into this range. */ |
| unsigned int nf_nat_setup_info(struct nf_conn *ct, |
| const struct nf_nat_range2 *range, |
| enum nf_nat_manip_type maniptype); |
| |
| extern unsigned int nf_nat_alloc_null_binding(struct nf_conn *ct, |
| unsigned int hooknum); |
| |
| struct nf_conn_nat *nf_ct_nat_ext_add(struct nf_conn *ct); |
| |
| static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct) |
| { |
| #if IS_ENABLED(CONFIG_NF_NAT) |
| return nf_ct_ext_find(ct, NF_CT_EXT_NAT); |
| #else |
| return NULL; |
| #endif |
| } |
| |
| static inline bool nf_nat_oif_changed(unsigned int hooknum, |
| enum ip_conntrack_info ctinfo, |
| struct nf_conn_nat *nat, |
| const struct net_device *out) |
| { |
| #if IS_ENABLED(CONFIG_NF_NAT_MASQUERADE) |
| return nat && nat->masq_index && hooknum == NF_INET_POST_ROUTING && |
| CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL && |
| nat->masq_index != out->ifindex; |
| #else |
| return false; |
| #endif |
| } |
| |
| int nf_nat_register_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops, |
| const struct nf_hook_ops *nat_ops, unsigned int ops_count); |
| void nf_nat_unregister_fn(struct net *net, u8 pf, const struct nf_hook_ops *ops, |
| unsigned int ops_count); |
| |
| unsigned int nf_nat_packet(struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
| unsigned int hooknum, struct sk_buff *skb); |
| |
| unsigned int nf_nat_manip_pkt(struct sk_buff *skb, struct nf_conn *ct, |
| enum nf_nat_manip_type mtype, |
| enum ip_conntrack_dir dir); |
| void nf_nat_csum_recalc(struct sk_buff *skb, |
| u8 nfproto, u8 proto, void *data, __sum16 *check, |
| int datalen, int oldlen); |
| |
| int nf_nat_icmp_reply_translation(struct sk_buff *skb, struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned int hooknum); |
| |
| int nf_nat_icmpv6_reply_translation(struct sk_buff *skb, struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo, |
| unsigned int hooknum, unsigned int hdrlen); |
| |
| int nf_nat_ipv4_register_fn(struct net *net, const struct nf_hook_ops *ops); |
| void nf_nat_ipv4_unregister_fn(struct net *net, const struct nf_hook_ops *ops); |
| |
| int nf_nat_ipv6_register_fn(struct net *net, const struct nf_hook_ops *ops); |
| void nf_nat_ipv6_unregister_fn(struct net *net, const struct nf_hook_ops *ops); |
| |
| int nf_nat_inet_register_fn(struct net *net, const struct nf_hook_ops *ops); |
| void nf_nat_inet_unregister_fn(struct net *net, const struct nf_hook_ops *ops); |
| |
| unsigned int |
| nf_nat_inet_fn(void *priv, struct sk_buff *skb, |
| const struct nf_hook_state *state); |
| |
| static inline int nf_nat_initialized(struct nf_conn *ct, |
| enum nf_nat_manip_type manip) |
| { |
| if (manip == NF_NAT_MANIP_SRC) |
| return ct->status & IPS_SRC_NAT_DONE; |
| else |
| return ct->status & IPS_DST_NAT_DONE; |
| } |
| #endif |