| /* 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 |
| { |
| /* Protocol name */ |
| const char *name; |
| |
| /* Protocol number. */ |
| unsigned int protonum; |
| |
| /* 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 ip_conntrack_tuple *tuple, |
| 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); |
| }; |
| |
| #define MAX_IP_NAT_PROTO 256 |
| extern struct ip_nat_protocol *ip_nat_protos[MAX_IP_NAT_PROTO]; |
| |
| /* Protocol registration. */ |
| extern int ip_nat_protocol_register(struct ip_nat_protocol *proto); |
| extern void ip_nat_protocol_unregister(struct ip_nat_protocol *proto); |
| |
| static inline struct ip_nat_protocol *ip_nat_find_proto(u_int8_t protocol) |
| { |
| return ip_nat_protos[protocol]; |
| } |
| |
| /* Built-in protocols. */ |
| extern struct ip_nat_protocol ip_nat_protocol_tcp; |
| extern struct ip_nat_protocol ip_nat_protocol_udp; |
| extern struct ip_nat_protocol ip_nat_protocol_icmp; |
| extern struct ip_nat_protocol ip_nat_unknown_protocol; |
| |
| 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*/ |