| /* 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 number. */ |
| unsigned int protonum; |
| |
| struct module *me; |
| |
| /* Translate a packet to the target according to manip type. |
| Return true if succeeded. */ |
| bool (*manip_pkt)(struct sk_buff *skb, |
| 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? */ |
| bool (*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. */ |
| bool (*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_nlattr)(struct sk_buff *skb, |
| const struct nf_nat_range *range); |
| |
| int (*nlattr_to_range)(struct nlattr *tb[], |
| struct nf_nat_range *range); |
| }; |
| |
| /* Protocol registration. */ |
| extern int nf_nat_protocol_register(const struct nf_nat_protocol *proto); |
| extern void nf_nat_protocol_unregister(const struct nf_nat_protocol *proto); |
| |
| extern const struct nf_nat_protocol *nf_nat_proto_find_get(u_int8_t protocol); |
| extern void nf_nat_proto_put(const struct nf_nat_protocol *proto); |
| |
| /* Built-in protocols. */ |
| extern const struct nf_nat_protocol nf_nat_protocol_tcp; |
| extern const struct nf_nat_protocol nf_nat_protocol_udp; |
| extern const struct nf_nat_protocol nf_nat_protocol_icmp; |
| extern const struct nf_nat_protocol nf_nat_unknown_protocol; |
| |
| extern int init_protocols(void) __init; |
| extern void cleanup_protocols(void); |
| extern const struct nf_nat_protocol *find_nat_proto(u_int16_t protonum); |
| |
| extern bool nf_nat_proto_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); |
| |
| extern bool nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple, |
| const struct nf_nat_range *range, |
| enum nf_nat_manip_type maniptype, |
| const struct nf_conn *ct, |
| u_int16_t *rover); |
| |
| extern int nf_nat_proto_range_to_nlattr(struct sk_buff *skb, |
| const struct nf_nat_range *range); |
| extern int nf_nat_proto_nlattr_to_range(struct nlattr *tb[], |
| struct nf_nat_range *range); |
| |
| #endif /*_NF_NAT_PROTO_H*/ |