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>
6
7 struct iphdr;
8 struct ip_nat_range;
9
10 struct ip_nat_protocol
11 {
12 /* Protocol name */
13 const char *name;
14
15 /* Protocol number. */
16 unsigned int protonum;
17
18 /* Translate a packet to the target according to manip type.
19 Return true if succeeded. */
20 int (*manip_pkt)(struct sk_buff **pskb,
21 unsigned int iphdroff,
22 const struct ip_conntrack_tuple *tuple,
23 enum ip_nat_manip_type maniptype);
24
25 /* Is the manipable part of the tuple between min and max incl? */
26 int (*in_range)(const struct ip_conntrack_tuple *tuple,
27 enum ip_nat_manip_type maniptype,
28 const union ip_conntrack_manip_proto *min,
29 const union ip_conntrack_manip_proto *max);
30
31 /* Alter the per-proto part of the tuple (depending on
32 maniptype), to give a unique tuple in the given range if
33 possible; return false if not. Per-protocol part of tuple
34 is initialized to the incoming packet. */
35 int (*unique_tuple)(struct ip_conntrack_tuple *tuple,
36 const struct ip_nat_range *range,
37 enum ip_nat_manip_type maniptype,
38 const struct ip_conntrack *conntrack);
39
40 unsigned int (*print)(char *buffer,
41 const struct ip_conntrack_tuple *match,
42 const struct ip_conntrack_tuple *mask);
43
44 unsigned int (*print_range)(char *buffer,
45 const struct ip_nat_range *range);
46 };
47
48 #define MAX_IP_NAT_PROTO 256
49 extern struct ip_nat_protocol *ip_nat_protos[MAX_IP_NAT_PROTO];
50
51 /* Protocol registration. */
52 extern int ip_nat_protocol_register(struct ip_nat_protocol *proto);
53 extern void ip_nat_protocol_unregister(struct ip_nat_protocol *proto);
54
55 static inline struct ip_nat_protocol *ip_nat_find_proto(u_int8_t protocol)
56 {
57 return ip_nat_protos[protocol];
58 }
59
60 /* Built-in protocols. */
61 extern struct ip_nat_protocol ip_nat_protocol_tcp;
62 extern struct ip_nat_protocol ip_nat_protocol_udp;
63 extern struct ip_nat_protocol ip_nat_protocol_icmp;
64 extern struct ip_nat_protocol ip_nat_unknown_protocol;
65
66 extern int init_protocols(void) __init;
67 extern void cleanup_protocols(void);
68 extern struct ip_nat_protocol *find_nat_proto(u_int16_t protonum);
69
70 #endif /*_IP_NAT_PROTO_H*/
71
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