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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>

struct sk_buff;

/* Flags */

/* NAT helper must be called on every packet (for TCP) */

#define IP_NAT_HELPER_F_ALWAYS          0x01

/* Standalone NAT helper, without a conntrack part */

#define IP_NAT_HELPER_F_STANDALONE      0x02

struct ip_nat_helper

{

        struct list_head list;          /* Internal use */

        const char *name;               /* name of the module */

        unsigned char flags;            /* Flags (see above) */

        struct module *me;              /* pointer to self */

        /* Mask of things we will help: vs. tuple from server */

        struct ip_conntrack_tuple tuple;

        struct ip_conntrack_tuple mask;

        /* Helper function: returns verdict */

        unsigned int (*help)(struct ip_conntrack *ct,

                             struct ip_conntrack_expect *exp,

                             struct ip_nat_info *info,

                             enum ip_conntrack_info ctinfo,

                             unsigned int hooknum,

                             struct sk_buff **pskb);

        /* Returns verdict and sets up NAT for this connection */

        unsigned int (*expect)(struct sk_buff **pskb,

                               unsigned int hooknum,

                               struct ip_conntrack *ct,

                               struct ip_nat_info *info);

};

extern struct list_head helpers;

extern int ip_nat_helper_register(struct ip_nat_helper *me);

extern void ip_nat_helper_unregister(struct ip_nat_helper *me);

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,

                                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,

                                char *rep_buffer,

                                unsigned int rep_len);

extern int ip_nat_seq_adjust(struct sk_buff *skb,

                                struct ip_conntrack *ct,

                                enum ip_conntrack_info ctinfo);

extern void ip_nat_delete_sack(struct sk_buff *skb);

#endif