1/* Header for use in defining a given protocol. */ 2#ifndef _NF_NAT_PROTOCOL_H 3#define _NF_NAT_PROTOCOL_H 4#include <net/netfilter/nf_nat.h> 5#include <linux/netfilter/nfnetlink_conntrack.h> 6 7struct nf_nat_range; 8 9struct nf_nat_protocol { 10 /* Protocol number. */ 11 unsigned int protonum; 12 13 struct module *me; 14 15 /* Translate a packet to the target according to manip type. 16 Return true if succeeded. */ 17 bool (*manip_pkt)(struct sk_buff *skb, 18 unsigned int iphdroff, 19 const struct nf_conntrack_tuple *tuple, 20 enum nf_nat_manip_type maniptype); 21 22 /* Is the manipable part of the tuple between min and max incl? */ 23 bool (*in_range)(const struct nf_conntrack_tuple *tuple, 24 enum nf_nat_manip_type maniptype, 25 const union nf_conntrack_man_proto *min, 26 const union nf_conntrack_man_proto *max); 27 28 /* Alter the per-proto part of the tuple (depending on 29 maniptype), to give a unique tuple in the given range if 30 possible. Per-protocol part of tuple is initialized to the 31 incoming packet. */ 32 void (*unique_tuple)(struct nf_conntrack_tuple *tuple, 33 const struct nf_nat_range *range, 34 enum nf_nat_manip_type maniptype, 35 const struct nf_conn *ct); 36 37 int (*range_to_nlattr)(struct sk_buff *skb, 38 const struct nf_nat_range *range); 39 40 int (*nlattr_to_range)(struct nlattr *tb[], 41 struct nf_nat_range *range); 42}; 43 44/* Protocol registration. */ 45extern int nf_nat_protocol_register(const struct nf_nat_protocol *proto); 46extern void nf_nat_protocol_unregister(const struct nf_nat_protocol *proto); 47 48extern const struct nf_nat_protocol *nf_nat_proto_find_get(u_int8_t protocol); 49extern void nf_nat_proto_put(const struct nf_nat_protocol *proto); 50 51/* Built-in protocols. */ 52extern const struct nf_nat_protocol nf_nat_protocol_tcp; 53extern const struct nf_nat_protocol nf_nat_protocol_udp; 54extern const struct nf_nat_protocol nf_nat_protocol_icmp; 55extern const struct nf_nat_protocol nf_nat_unknown_protocol; 56 57extern int init_protocols(void) __init; 58extern void cleanup_protocols(void); 59extern const struct nf_nat_protocol *find_nat_proto(u_int16_t protonum); 60 61extern bool nf_nat_proto_in_range(const struct nf_conntrack_tuple *tuple, 62 enum nf_nat_manip_type maniptype, 63 const union nf_conntrack_man_proto *min, 64 const union nf_conntrack_man_proto *max); 65 66extern void nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple, 67 const struct nf_nat_range *range, 68 enum nf_nat_manip_type maniptype, 69 const struct nf_conn *ct, 70 u_int16_t *rover); 71 72extern int nf_nat_proto_range_to_nlattr(struct sk_buff *skb, 73 const struct nf_nat_range *range); 74extern int nf_nat_proto_nlattr_to_range(struct nlattr *tb[], 75 struct nf_nat_range *range); 76 77#endif /*_NF_NAT_PROTO_H*/ 78