1 /* Header for use in defining a given protocol. */
2 #ifndef _IP_NAT_PROTOCOL_H
3 #define _IP_NAT_PROTOCOL_H
4 #include <linux/init.h>
5 #include <linux/list.h>
7 #include <linux/netfilter_ipv4/ip_nat.h>
8 #include <linux/netfilter/nfnetlink_conntrack.h>
13 struct ip_nat_protocol
18 /* Protocol number. */
19 unsigned int protonum
;
23 /* Translate a packet to the target according to manip type.
24 Return true if succeeded. */
25 int (*manip_pkt
)(struct sk_buff
**pskb
,
26 unsigned int iphdroff
,
27 const struct ip_conntrack_tuple
*tuple
,
28 enum ip_nat_manip_type maniptype
);
30 /* Is the manipable part of the tuple between min and max incl? */
31 int (*in_range
)(const struct ip_conntrack_tuple
*tuple
,
32 enum ip_nat_manip_type maniptype
,
33 const union ip_conntrack_manip_proto
*min
,
34 const union ip_conntrack_manip_proto
*max
);
36 /* Alter the per-proto part of the tuple (depending on
37 maniptype), to give a unique tuple in the given range if
38 possible; return false if not. Per-protocol part of tuple
39 is initialized to the incoming packet. */
40 int (*unique_tuple
)(struct ip_conntrack_tuple
*tuple
,
41 const struct ip_nat_range
*range
,
42 enum ip_nat_manip_type maniptype
,
43 const struct ip_conntrack
*conntrack
);
45 int (*range_to_nfattr
)(struct sk_buff
*skb
,
46 const struct ip_nat_range
*range
);
48 int (*nfattr_to_range
)(struct nfattr
*tb
[],
49 struct ip_nat_range
*range
);
52 /* Protocol registration. */
53 extern int ip_nat_protocol_register(struct ip_nat_protocol
*proto
);
54 extern void ip_nat_protocol_unregister(struct ip_nat_protocol
*proto
);
56 extern struct ip_nat_protocol
*ip_nat_proto_find_get(u_int8_t protocol
);
57 extern void ip_nat_proto_put(struct ip_nat_protocol
*proto
);
59 /* Built-in protocols. */
60 extern struct ip_nat_protocol ip_nat_protocol_tcp
;
61 extern struct ip_nat_protocol ip_nat_protocol_udp
;
62 extern struct ip_nat_protocol ip_nat_protocol_icmp
;
63 extern struct ip_nat_protocol ip_nat_unknown_protocol
;
65 extern int init_protocols(void) __init
;
66 extern void cleanup_protocols(void);
67 extern struct ip_nat_protocol
*find_nat_proto(u_int16_t protonum
);
69 extern int ip_nat_port_range_to_nfattr(struct sk_buff
*skb
,
70 const struct ip_nat_range
*range
);
71 extern int ip_nat_port_nfattr_to_range(struct nfattr
*tb
[],
72 struct ip_nat_range
*range
);
74 #endif /*_IP_NAT_PROTO_H*/