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/* Header for use in defining a given protocol. */

#ifndef _IP_NAT_PROTOCOL_H

#define _IP_NAT_PROTOCOL_H

#include <linux/init.h>

#include <linux/list.h>

struct iphdr;

struct ip_nat_range;

struct ip_nat_protocol

{

        struct list_head list;

        /* Protocol name */

        const char *name;

        /* Protocol number. */

        unsigned int protonum;

        /* Do a packet translation according to the ip_nat_proto_manip

         * and manip type. */

        void (*manip_pkt)(struct iphdr *iph, size_t len,

                          const struct ip_conntrack_manip *manip,

                          enum ip_nat_manip_type maniptype);

        /* Is the manipable part of the tuple between min and max incl? */

        int (*in_range)(const struct ip_conntrack_tuple *tuple,

                        enum ip_nat_manip_type maniptype,

                        const union ip_conntrack_manip_proto *min,

                        const union ip_conntrack_manip_proto *max);

        /* Alter the per-proto part of the tuple (depending on

           maniptype), to give a unique tuple in the given range if

           possible; return false if not.  Per-protocol part of tuple

           is initialized to the incoming packet. */

        int (*unique_tuple)(struct ip_conntrack_tuple *tuple,

                            const struct ip_nat_range *range,

                            enum ip_nat_manip_type maniptype,

                            const struct ip_conntrack *conntrack);

        unsigned int (*print)(char *buffer,

                              const struct ip_conntrack_tuple *match,

                              const struct ip_conntrack_tuple *mask);

        unsigned int (*print_range)(char *buffer,

                                    const struct ip_nat_range *range);

};

/* Protocol registration. */

extern int ip_nat_protocol_register(struct ip_nat_protocol *proto);

extern void ip_nat_protocol_unregister(struct ip_nat_protocol *proto);

extern int init_protocols(void) __init;

extern void cleanup_protocols(void);

extern struct ip_nat_protocol *find_nat_proto(u_int16_t protonum);

#endif /*_IP_NAT_PROTO_H*/