1 /* Header for use in defining a given protocol. */
2 #ifndef _NF_NAT_L4PROTO_H
3 #define _NF_NAT_L4PROTO_H
4 #include <net/netfilter/nf_nat.h>
5 #include <linux/netfilter/nfnetlink_conntrack.h>
10 struct nf_nat_l4proto
{
11 /* Protocol number. */
14 /* Translate a packet to the target according to manip type.
15 * Return true if succeeded.
17 bool (*manip_pkt
)(struct sk_buff
*skb
,
18 const struct nf_nat_l3proto
*l3proto
,
19 unsigned int iphdroff
, unsigned int hdroff
,
20 const struct nf_conntrack_tuple
*tuple
,
21 enum nf_nat_manip_type maniptype
);
23 /* Is the manipable part of the tuple between min and max incl? */
24 bool (*in_range
)(const struct nf_conntrack_tuple
*tuple
,
25 enum nf_nat_manip_type maniptype
,
26 const union nf_conntrack_man_proto
*min
,
27 const union nf_conntrack_man_proto
*max
);
29 /* Alter the per-proto part of the tuple (depending on
30 * maniptype), to give a unique tuple in the given range if
31 * possible. Per-protocol part of tuple is initialized to the
34 void (*unique_tuple
)(const struct nf_nat_l3proto
*l3proto
,
35 struct nf_conntrack_tuple
*tuple
,
36 const struct nf_nat_range
*range
,
37 enum nf_nat_manip_type maniptype
,
38 const struct nf_conn
*ct
);
40 int (*nlattr_to_range
)(struct nlattr
*tb
[],
41 struct nf_nat_range
*range
);
44 /* Protocol registration. */
45 int nf_nat_l4proto_register(u8 l3proto
, const struct nf_nat_l4proto
*l4proto
);
46 void nf_nat_l4proto_unregister(u8 l3proto
,
47 const struct nf_nat_l4proto
*l4proto
);
49 const struct nf_nat_l4proto
*__nf_nat_l4proto_find(u8 l3proto
, u8 l4proto
);
51 /* Built-in protocols. */
52 extern const struct nf_nat_l4proto nf_nat_l4proto_tcp
;
53 extern const struct nf_nat_l4proto nf_nat_l4proto_udp
;
54 extern const struct nf_nat_l4proto nf_nat_l4proto_icmp
;
55 extern const struct nf_nat_l4proto nf_nat_l4proto_icmpv6
;
56 extern const struct nf_nat_l4proto nf_nat_l4proto_unknown
;
58 bool nf_nat_l4proto_in_range(const struct nf_conntrack_tuple
*tuple
,
59 enum nf_nat_manip_type maniptype
,
60 const union nf_conntrack_man_proto
*min
,
61 const union nf_conntrack_man_proto
*max
);
63 void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto
*l3proto
,
64 struct nf_conntrack_tuple
*tuple
,
65 const struct nf_nat_range
*range
,
66 enum nf_nat_manip_type maniptype
,
67 const struct nf_conn
*ct
, u16
*rover
);
69 int nf_nat_l4proto_nlattr_to_range(struct nlattr
*tb
[],
70 struct nf_nat_range
*range
);
72 #endif /*_NF_NAT_L4PROTO_H*/