1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* Header for use in defining a given protocol. */
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#ifndef _IP_NAT_PROTOCOL_H
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#define _IP_NAT_PROTOCOL_H
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#include <linux/init.h>
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#include <linux/list.h>
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struct iphdr;
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struct ip_nat_range;
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struct ip_nat_protocol
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{
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/* Protocol name */
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const char *name;
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/* Protocol number. */
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unsigned int protonum;
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/* Translate a packet to the target according to manip type.
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Return true if succeeded. */
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int (*manip_pkt)(struct sk_buff **pskb,
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unsigned int iphdroff,
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const struct ip_conntrack_tuple *tuple,
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enum ip_nat_manip_type maniptype);
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/* Is the manipable part of the tuple between min and max incl? */
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int (*in_range)(const struct ip_conntrack_tuple *tuple,
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enum ip_nat_manip_type maniptype,
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const union ip_conntrack_manip_proto *min,
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const union ip_conntrack_manip_proto *max);
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/* Alter the per-proto part of the tuple (depending on
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maniptype), to give a unique tuple in the given range if
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possible; return false if not. Per-protocol part of tuple
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is initialized to the incoming packet. */
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int (*unique_tuple)(struct ip_conntrack_tuple *tuple,
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const struct ip_nat_range *range,
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enum ip_nat_manip_type maniptype,
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const struct ip_conntrack *conntrack);
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unsigned int (*print)(char *buffer,
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const struct ip_conntrack_tuple *match,
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const struct ip_conntrack_tuple *mask);
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unsigned int (*print_range)(char *buffer,
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const struct ip_nat_range *range);
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};
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#define MAX_IP_NAT_PROTO 256
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extern struct ip_nat_protocol *ip_nat_protos[MAX_IP_NAT_PROTO];
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/* Protocol registration. */
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extern int ip_nat_protocol_register(struct ip_nat_protocol *proto);
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extern void ip_nat_protocol_unregister(struct ip_nat_protocol *proto);
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static inline struct ip_nat_protocol *ip_nat_find_proto(u_int8_t protocol)
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{
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return ip_nat_protos[protocol];
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}
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/* Built-in protocols. */
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extern struct ip_nat_protocol ip_nat_protocol_tcp;
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extern struct ip_nat_protocol ip_nat_protocol_udp;
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extern struct ip_nat_protocol ip_nat_protocol_icmp;
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extern struct ip_nat_protocol ip_nat_unknown_protocol;
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extern int init_protocols(void) __init;
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extern void cleanup_protocols(void);
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extern struct ip_nat_protocol *find_nat_proto(u_int16_t protonum);
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#endif /*_IP_NAT_PROTO_H*/
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