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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 nfattr *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 nfattr *tb[],
- struct nf_nat_range *range);
- #endif /*_NF_NAT_PROTO_H*/
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