Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/* Header for use in defining a given protocol. */
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#ifndef _NF_NAT_PROTOCOL_H
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#define _NF_NAT_PROTOCOL_H
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#include <net/netfilter/nf_nat.h>
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#include <linux/netfilter/nfnetlink_conntrack.h>
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struct nf_nat_range;
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struct nf_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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struct module *me;
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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 *skb,
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unsigned int iphdroff,
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const struct nf_conntrack_tuple *tuple,
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enum nf_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 nf_conntrack_tuple *tuple,
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enum nf_nat_manip_type maniptype,
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const union nf_conntrack_man_proto *min,
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const union nf_conntrack_man_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 nf_conntrack_tuple *tuple,
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const struct nf_nat_range *range,
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enum nf_nat_manip_type maniptype,
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const struct nf_conn *ct);
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int (*range_to_nlattr)(struct sk_buff *skb,
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const struct nf_nat_range *range);
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int (*nlattr_to_range)(struct nlattr *tb[],
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struct nf_nat_range *range);
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};
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/* Protocol registration. */
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extern int nf_nat_protocol_register(const struct nf_nat_protocol *proto);
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extern void nf_nat_protocol_unregister(const struct nf_nat_protocol *proto);
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extern const struct nf_nat_protocol *nf_nat_proto_find_get(u_int8_t protocol);
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extern void nf_nat_proto_put(const struct nf_nat_protocol *proto);
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/* Built-in protocols. */
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extern const struct nf_nat_protocol nf_nat_protocol_tcp;
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extern const struct nf_nat_protocol nf_nat_protocol_udp;
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extern const struct nf_nat_protocol nf_nat_protocol_icmp;
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extern const struct nf_nat_protocol nf_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 const struct nf_nat_protocol *find_nat_proto(u_int16_t protonum);
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extern int nf_nat_port_range_to_nlattr(struct sk_buff *skb,
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const struct nf_nat_range *range);
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extern int nf_nat_port_nlattr_to_range(struct nlattr *tb[],
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struct nf_nat_range *range);
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#endif /*_NF_NAT_PROTO_H*/
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