1#ifndef _NF_OSF_H
2#define _NF_OSF_H
3
4#include <linux/types.h>
5#include <linux/ip.h>
6#include <linux/tcp.h>
7
8#define MAXGENRELEN	32
9
10#define NF_OSF_GENRE	(1 << 0)
11#define NF_OSF_TTL	(1 << 1)
12#define NF_OSF_LOG	(1 << 2)
13#define NF_OSF_INVERT	(1 << 3)
14
15#define NF_OSF_LOGLEVEL_ALL		0	/* log all matched fingerprints */
16#define NF_OSF_LOGLEVEL_FIRST		1	/* log only the first matced fingerprint */
17#define NF_OSF_LOGLEVEL_ALL_KNOWN	2	/* do not log unknown packets */
18
19#define NF_OSF_TTL_TRUE			0	/* True ip and fingerprint TTL comparison */
20
21/* Check if ip TTL is less than fingerprint one */
22#define NF_OSF_TTL_LESS			1
23
24/* Do not compare ip and fingerprint TTL at all */
25#define NF_OSF_TTL_NOCHECK		2
26
27#define NF_OSF_FLAGMASK		(NF_OSF_GENRE | NF_OSF_TTL | \
28				 NF_OSF_LOG | NF_OSF_INVERT)
29/* Wildcard MSS (kind of).
30 * It is used to implement a state machine for the different wildcard values
31 * of the MSS and window sizes.
32 */
33struct nf_osf_wc {
34	__u32	wc;
35	__u32	val;
36};
37
38/* This struct represents IANA options
39 * http://www.iana.org/assignments/tcp-parameters
40 */
41struct nf_osf_opt {
42	__u16			kind, length;
43	struct nf_osf_wc	wc;
44};
45
46struct nf_osf_info {
47	char	genre[MAXGENRELEN];
48	__u32	len;
49	__u32	flags;
50	__u32	loglevel;
51	__u32	ttl;
52};
53
54struct nf_osf_user_finger {
55	struct nf_osf_wc	wss;
56
57	__u8	ttl, df;
58	__u16	ss, mss;
59	__u16	opt_num;
60
61	char	genre[MAXGENRELEN];
62	char	version[MAXGENRELEN];
63	char	subtype[MAXGENRELEN];
64
65	/* MAX_IPOPTLEN is maximum if all options are NOPs or EOLs */
66	struct nf_osf_opt	opt[MAX_IPOPTLEN];
67};
68
69struct nf_osf_nlmsg {
70	struct nf_osf_user_finger	f;
71	struct iphdr			ip;
72	struct tcphdr			tcp;
73};
74
75/* Defines for IANA option kinds */
76enum iana_options {
77	OSFOPT_EOL = 0,		/* End of options */
78	OSFOPT_NOP,		/* NOP */
79	OSFOPT_MSS,		/* Maximum segment size */
80	OSFOPT_WSO,		/* Window scale option */
81	OSFOPT_SACKP,		/* SACK permitted */
82	OSFOPT_SACK,		/* SACK */
83	OSFOPT_ECHO,
84	OSFOPT_ECHOREPLY,
85	OSFOPT_TS,		/* Timestamp option */
86	OSFOPT_POCP,		/* Partial Order Connection Permitted */
87	OSFOPT_POSP,		/* Partial Order Service Profile */
88
89	/* Others are not used in the current OSF */
90	OSFOPT_EMPTY = 255,
91};
92
93/* Initial window size option state machine: multiple of mss, mtu or
94 * plain numeric value. Can also be made as plain numeric value which
95 * is not a multiple of specified value.
96 */
97enum nf_osf_window_size_options {
98	OSF_WSS_PLAIN	= 0,
99	OSF_WSS_MSS,
100	OSF_WSS_MTU,
101	OSF_WSS_MODULO,
102	OSF_WSS_MAX,
103};
104
105enum nf_osf_attr_type {
106	OSF_ATTR_UNSPEC,
107	OSF_ATTR_FINGER,
108	OSF_ATTR_MAX,
109};
110
111/*
112 * Add/remove fingerprint from the kernel.
113 */
114enum nf_osf_msg_types {
115	OSF_MSG_ADD,
116	OSF_MSG_REMOVE,
117	OSF_MSG_MAX,
118};
119
120#endif /* _NF_OSF_H */
121