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#ifndef _IP_NAT_HELPER_H
#define _IP_NAT_HELPER_H
/* NAT protocol helper routines. */
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include <linux/module.h>
struct sk_buff;
/* These return true or false. */
extern int ip_nat_mangle_tcp_packet(struct sk_buff **skb,
struct ip_conntrack *ct,
enum ip_conntrack_info ctinfo,
unsigned int match_offset,
unsigned int match_len,
const char *rep_buffer,
unsigned int rep_len);
extern int ip_nat_mangle_udp_packet(struct sk_buff **skb,
struct ip_conntrack *ct,
enum ip_conntrack_info ctinfo,
unsigned int match_offset,
unsigned int match_len,
const char *rep_buffer,
unsigned int rep_len);
extern int ip_nat_seq_adjust(struct sk_buff **pskb,
struct ip_conntrack *ct,
enum ip_conntrack_info ctinfo);
/* Setup NAT on this expected conntrack so it follows master, but goes
* to port ct->master->saved_proto. */
extern void ip_nat_follow_master(struct ip_conntrack *ct,
struct ip_conntrack_expect *this);
#endif
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