1/* This file was manually copied from the Linux kernel source
2 * and manually stripped from __KERNEL__ sections and unused functions.
3 */
4
5/*
6 * Definitions and Declarations for tuple.
7 *
8 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
9 *	- generalize L3 protocol dependent part.
10 *
11 * Derived from include/linux/netfiter_ipv4/ip_conntrack_tuple.h
12 */
13
14#ifndef _NF_CONNTRACK_TUPLE_H
15#define _NF_CONNTRACK_TUPLE_H
16
17#include <linux/netfilter/x_tables.h>
18#include <linux/netfilter/nf_conntrack_tuple_common.h>
19
20/* A `tuple' is a structure containing the information to uniquely
21  identify a connection.  ie. if two packets have the same tuple, they
22  are in the same connection; if not, they are not.
23
24  We divide the structure along "manipulatable" and
25  "non-manipulatable" lines, for the benefit of the NAT code.
26*/
27
28#define NF_CT_TUPLE_L3SIZE	ARRAY_SIZE(((union nf_inet_addr *)NULL)->all)
29
30/* The protocol-specific manipulable parts of the tuple: always in
31   network order! */
32union nf_conntrack_man_proto
33{
34	/* Add other protocols here. */
35	__be16 all;
36
37	struct {
38		__be16 port;
39	} tcp;
40	struct {
41		__be16 port;
42	} udp;
43	struct {
44		__be16 id;
45	} icmp;
46	struct {
47		__be16 port;
48	} dccp;
49	struct {
50		__be16 port;
51	} sctp;
52	struct {
53		__be16 key;	/* GRE key is 32bit, PPtP only uses 16bit */
54	} gre;
55};
56
57/* The manipulable part of the tuple. */
58struct nf_conntrack_man
59{
60	union nf_inet_addr u3;
61	union nf_conntrack_man_proto u;
62	/* Layer 3 protocol */
63	u_int16_t l3num;
64};
65
66/* This contains the information to distinguish a connection. */
67struct nf_conntrack_tuple
68{
69	struct nf_conntrack_man src;
70
71	/* These are the parts of the tuple which are fixed. */
72	struct {
73		union nf_inet_addr u3;
74		union {
75			/* Add other protocols here. */
76			__be16 all;
77
78			struct {
79				__be16 port;
80			} tcp;
81			struct {
82				__be16 port;
83			} udp;
84			struct {
85				u_int8_t type, code;
86			} icmp;
87			struct {
88				__be16 port;
89			} dccp;
90			struct {
91				__be16 port;
92			} sctp;
93			struct {
94				__be16 key;
95			} gre;
96		} u;
97
98		/* The protocol. */
99		u_int8_t protonum;
100
101		/* The direction (for tuplehash) */
102		u_int8_t dir;
103	} dst;
104};
105
106struct nf_conntrack_tuple_mask
107{
108	struct {
109		union nf_inet_addr u3;
110		union nf_conntrack_man_proto u;
111	} src;
112};
113
114#endif /* _NF_CONNTRACK_TUPLE_H */
115