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- #ifndef _NF_NAT_H
- #define _NF_NAT_H
- #include <linux/netfilter_ipv4.h>
- #include <net/netfilter/nf_conntrack_tuple.h>
- #define NF_NAT_MAPPING_TYPE_MAX_NAMELEN 16
- enum nf_nat_manip_type
- {
- IP_NAT_MANIP_SRC,
- IP_NAT_MANIP_DST
- };
- /* SRC manip occurs POST_ROUTING or LOCAL_IN */
- #define HOOK2MANIP(hooknum) ((hooknum) != NF_IP_POST_ROUTING && (hooknum) != NF_IP_LOCAL_IN)
- #define IP_NAT_RANGE_MAP_IPS 1
- #define IP_NAT_RANGE_PROTO_SPECIFIED 2
- #define IP_NAT_RANGE_PROTO_RANDOM 4
- /* 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 */
- int16_t offset_before, offset_after;
- };
- /* Single range specification. */
- struct nf_nat_range
- {
- /* Set to OR of flags above. */
- unsigned int flags;
- /* Inclusive: network order. */
- __be32 min_ip, max_ip;
- /* Inclusive: network order */
- union nf_conntrack_man_proto min, max;
- };
- /* For backwards compat: don't use in modern code. */
- struct nf_nat_multi_range_compat
- {
- unsigned int rangesize; /* Must be 1. */
- /* hangs off end. */
- struct nf_nat_range range[1];
- };
- #ifdef __KERNEL__
- #include <linux/list.h>
- /* The structure embedded in the conntrack structure. */
- struct nf_nat_info
- {
- struct list_head bysource;
- struct nf_nat_seq seq[IP_CT_DIR_MAX];
- };
- struct nf_conn;
- /* 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,
- unsigned int hooknum);
- /* 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);
- extern int nf_nat_module_is_loaded;
- #else /* !__KERNEL__: iptables wants this to compile. */
- #define nf_nat_multi_range nf_nat_multi_range_compat
- #endif /*__KERNEL__*/
- #endif
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