78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
#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
|
|
|
|
/* 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
|