| #ifndef _NF_NAT_H |
| #define _NF_NAT_H |
| #include <linux/netfilter_ipv4.h> |
| #include <linux/netfilter/nf_nat.h> |
| #include <net/netfilter/nf_conntrack_tuple.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) |
| |
| /* NAT sequence number modifications */ |
| struct nf_nat_seq { |
| /* position of the last TCP sequence number modification (if any) */ |
| u_int32_t correction_pos; |
| |
| /* sequence number offset before and after last modification */ |
| int32_t offset_before, offset_after; |
| }; |
| |
| #include <linux/list.h> |
| #include <linux/netfilter/nf_conntrack_pptp.h> |
| #include <net/netfilter/nf_conntrack_extend.h> |
| |
| /* per conntrack: nat application helper private data */ |
| union nf_conntrack_nat_help { |
| /* insert nat helper private data here */ |
| #if defined(CONFIG_NF_NAT_PPTP) || defined(CONFIG_NF_NAT_PPTP_MODULE) |
| struct nf_nat_pptp nat_pptp_info; |
| #endif |
| }; |
| |
| struct nf_conn; |
| |
| /* The structure embedded in the conntrack structure. */ |
| struct nf_conn_nat { |
| struct hlist_node bysource; |
| struct nf_nat_seq seq[IP_CT_DIR_MAX]; |
| struct nf_conn *ct; |
| union nf_conntrack_nat_help help; |
| #if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \ |
| defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE) || \ |
| defined(CONFIG_IP6_NF_TARGET_MASQUERADE) || \ |
| defined(CONFIG_IP6_NF_TARGET_MASQUERADE_MODULE) |
| int masq_index; |
| #endif |
| }; |
| |
| /* Set up the info structure to map into this range. */ |
| extern unsigned int nf_nat_setup_info(struct nf_conn *ct, |
| const struct nf_nat_range *range, |
| enum nf_nat_manip_type maniptype); |
| |
| /* Is this tuple already taken? (not by us)*/ |
| extern int nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple, |
| const struct nf_conn *ignored_conntrack); |
| |
| static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct) |
| { |
| #if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE) |
| 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_IP_NF_TARGET_MASQUERADE) || \ |
| IS_ENABLED(CONFIG_IP6_NF_TARGET_MASQUERADE) |
| return nat->masq_index && hooknum == NF_INET_POST_ROUTING && |
| CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL && |
| nat->masq_index != out->ifindex; |
| #else |
| return false; |
| #endif |
| } |
| |
| #endif |