nfnetlink_osf.h

  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 */