root/include/uapi/linux/netfilter/xt_osf.h

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/*
 * Copyright (c) 2003+ Evgeniy Polyakov <johnpol@2ka.mxt.ru>
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _XT_OSF_H
#define _XT_OSF_H

#include <linux/types.h>

#define MAXGENRELEN             32

#define XT_OSF_GENRE            (1<<0)
#define XT_OSF_TTL              (1<<1)
#define XT_OSF_LOG              (1<<2)
#define XT_OSF_INVERT           (1<<3)

#define XT_OSF_LOGLEVEL_ALL     0       /* log all matched fingerprints */
#define XT_OSF_LOGLEVEL_FIRST   1       /* log only the first matced fingerprint */
#define XT_OSF_LOGLEVEL_ALL_KNOWN       2 /* do not log unknown packets */

#define XT_OSF_TTL_TRUE         0       /* True ip and fingerprint TTL comparison */
#define XT_OSF_TTL_LESS         1       /* Check if ip TTL is less than fingerprint one */
#define XT_OSF_TTL_NOCHECK      2       /* Do not compare ip and fingerprint TTL at all */

struct xt_osf_info {
        char                    genre[MAXGENRELEN];
        __u32                   len;
        __u32                   flags;
        __u32                   loglevel;
        __u32                   ttl;
};

/*
 * Wildcard MSS (kind of).
 * It is used to implement a state machine for the different wildcard values
 * of the MSS and window sizes.
 */
struct xt_osf_wc {
        __u32                   wc;
        __u32                   val;
};

/*
 * This struct represents IANA options
 * http://www.iana.org/assignments/tcp-parameters
 */
struct xt_osf_opt {
        __u16                   kind, length;
        struct xt_osf_wc        wc;
};

struct xt_osf_user_finger {
        struct xt_osf_wc        wss;

        __u8                    ttl, df;
        __u16                   ss, mss;
        __u16                   opt_num;

        char                    genre[MAXGENRELEN];
        char                    version[MAXGENRELEN];
        char                    subtype[MAXGENRELEN];

        /* MAX_IPOPTLEN is maximum if all options are NOPs or EOLs */
        struct xt_osf_opt       opt[MAX_IPOPTLEN];
};

struct xt_osf_nlmsg {
        struct xt_osf_user_finger       f;
        struct iphdr            ip;
        struct tcphdr           tcp;
};

/* Defines for IANA option kinds */

enum iana_options {
        OSFOPT_EOL = 0,         /* End of options */
        OSFOPT_NOP,             /* NOP */
        OSFOPT_MSS,             /* Maximum segment size */
        OSFOPT_WSO,             /* Window scale option */
        OSFOPT_SACKP,           /* SACK permitted */
        OSFOPT_SACK,            /* SACK */
        OSFOPT_ECHO,
        OSFOPT_ECHOREPLY,
        OSFOPT_TS,              /* Timestamp option */
        OSFOPT_POCP,            /* Partial Order Connection Permitted */
        OSFOPT_POSP,            /* Partial Order Service Profile */

        /* Others are not used in the current OSF */
        OSFOPT_EMPTY = 255,
};

/*
 * Initial window size option state machine: multiple of mss, mtu or
 * plain numeric value. Can also be made as plain numeric value which
 * is not a multiple of specified value.
 */
enum xt_osf_window_size_options {
        OSF_WSS_PLAIN   = 0,
        OSF_WSS_MSS,
        OSF_WSS_MTU,
        OSF_WSS_MODULO,
        OSF_WSS_MAX,
};

/*
 * Add/remove fingerprint from the kernel.
 */
enum xt_osf_msg_types {
        OSF_MSG_ADD,
        OSF_MSG_REMOVE,
        OSF_MSG_MAX,
};

enum xt_osf_attr_type {
        OSF_ATTR_UNSPEC,
        OSF_ATTR_FINGER,
        OSF_ATTR_MAX,
};

#endif                          /* _XT_OSF_H */

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