Subversion Repositories shark

/* 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.  Return true if succeeded. */
        int (*manip_pkt)(struct sk_buff **pskb,
                         unsigned int hdroff,
                         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*/