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/* Header for use in defining a given protocol. */
#ifndef _NF_NAT_PROTOCOL_H
#define _NF_NAT_PROTOCOL_H
#include <net/netfilter/nf_nat.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
struct nf_nat_range;
struct nf_nat_protocol
{
/* Protocol name */
const char *name;
/* Protocol number. */
unsigned int protonum;
struct module *me;
/* Translate a packet to the target according to manip type.
Return true if succeeded. */
int (*manip_pkt)(struct sk_buff **pskb,
unsigned int iphdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype);
/* Is the manipable part of the tuple between min and max incl? */
int (*in_range)(const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype,
const union nf_conntrack_man_proto *min,
const union nf_conntrack_man_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 nf_conntrack_tuple *tuple,
const struct nf_nat_range *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct);
int (*range_to_nfattr)(struct sk_buff *skb,
const struct nf_nat_range *range);
int (*nfattr_to_range)(struct nlattr *tb[],
struct nf_nat_range *range);
};
/* Protocol registration. */
extern int nf_nat_protocol_register(struct nf_nat_protocol *proto);
extern void nf_nat_protocol_unregister(struct nf_nat_protocol *proto);
extern struct nf_nat_protocol *nf_nat_proto_find_get(u_int8_t protocol);
extern void nf_nat_proto_put(struct nf_nat_protocol *proto);
/* Built-in protocols. */
extern struct nf_nat_protocol nf_nat_protocol_tcp;
extern struct nf_nat_protocol nf_nat_protocol_udp;
extern struct nf_nat_protocol nf_nat_protocol_icmp;
extern struct nf_nat_protocol nf_nat_unknown_protocol;
extern int init_protocols(void) __init;
extern void cleanup_protocols(void);
extern struct nf_nat_protocol *find_nat_proto(u_int16_t protonum);
extern int nf_nat_port_range_to_nfattr(struct sk_buff *skb,
const struct nf_nat_range *range);
extern int nf_nat_port_nfattr_to_range(struct nlattr *tb[],
struct nf_nat_range *range);
#endif /*_NF_NAT_PROTO_H*/
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