1. 根目录:
2. include
3. linux
4. netfilter
5. nf_nat.h

#ifndef _NETFILTER_NF_NAT_H
#define _NETFILTER_NF_NAT_H

#include <linux/netfilter.h>
#include <linux/netfilter/nf_conntrack_tuple_common.h>

#define NF_NAT_RANGE_MAP_IPS		1
#define NF_NAT_RANGE_PROTO_SPECIFIED	2
#define NF_NAT_RANGE_PROTO_RANDOM	4
#define NF_NAT_RANGE_PERSISTENT		8

struct nf_nat_ipv4_range {
	unsigned int			flags;
	__be32				min_ip;
	__be32				max_ip;
	union nf_conntrack_man_proto	min;
	union nf_conntrack_man_proto	max;
};

struct nf_nat_ipv4_multi_range_compat {
	unsigned int			rangesize;
	struct nf_nat_ipv4_range	range[1];
};

#endif /* _NETFILTER_NF_NAT_H */