include/linux/netfilter/xt_osf.h

   1 /*
   2  * Copyright (c) 2003+ Evgeniy Polyakov <johnpol@2ka.mxt.ru>
   3  *
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #ifndef _XT_OSF_H
  21 #define _XT_OSF_H
  22
  23 #include <linux/types.h>
  24
  25 #define MAXGENRELEN             32
  26
  27 #define XT_OSF_GENRE            (1<<0)
  28 #define XT_OSF_TTL              (1<<1)
  29 #define XT_OSF_LOG              (1<<2)
  30 #define XT_OSF_INVERT           (1<<3)
  31
  32 #define XT_OSF_LOGLEVEL_ALL     0       /* log all matched fingerprints */
  33 #define XT_OSF_LOGLEVEL_FIRST   1       /* log only the first matced fingerprint */
  34 #define XT_OSF_LOGLEVEL_ALL_KNOWN       2 /* do not log unknown packets */
  35
  36 #define XT_OSF_TTL_TRUE         0       /* True ip and fingerprint TTL comparison */
  37 #define XT_OSF_TTL_LESS         1       /* Check if ip TTL is less than fingerprint one */
  38 #define XT_OSF_TTL_NOCHECK      2       /* Do not compare ip and fingerprint TTL at all */
  39
  40 struct xt_osf_info {
  41         char                    genre[MAXGENRELEN];
  42         __u32                   len;
  43         __u32                   flags;
  44         __u32                   loglevel;
  45         __u32                   ttl;
  46 };
  47
  48 /*
  49  * Wildcard MSS (kind of).
  50  * It is used to implement a state machine for the different wildcard values
  51  * of the MSS and window sizes.
  52  */
  53 struct xt_osf_wc {
  54         __u32                   wc;
  55         __u32                   val;
  56 };
  57
  58 /*
  59  * This struct represents IANA options
  60  * http://www.iana.org/assignments/tcp-parameters
  61  */
  62 struct xt_osf_opt {
  63         __u16                   kind, length;
  64         struct xt_osf_wc        wc;
  65 };
  66
  67 struct xt_osf_user_finger {
  68         struct xt_osf_wc        wss;
  69
  70         __u8                    ttl, df;
  71         __u16                   ss, mss;
  72         __u16                   opt_num;
  73
  74         char                    genre[MAXGENRELEN];
  75         char                    version[MAXGENRELEN];
  76         char                    subtype[MAXGENRELEN];
  77
  78         /* MAX_IPOPTLEN is maximum if all options are NOPs or EOLs */
  79         struct xt_osf_opt       opt[MAX_IPOPTLEN];
  80 };
  81
  82 struct xt_osf_nlmsg {
  83         struct xt_osf_user_finger       f;
  84         struct iphdr            ip;
  85         struct tcphdr           tcp;
  86 };
  87
  88 /* Defines for IANA option kinds */
  89
  90 enum iana_options {
  91         OSFOPT_EOL = 0,         /* End of options */
  92         OSFOPT_NOP,             /* NOP */
  93         OSFOPT_MSS,             /* Maximum segment size */
  94         OSFOPT_WSO,             /* Window scale option */
  95         OSFOPT_SACKP,           /* SACK permitted */
  96         OSFOPT_SACK,            /* SACK */
  97         OSFOPT_ECHO,
  98         OSFOPT_ECHOREPLY,
  99         OSFOPT_TS,              /* Timestamp option */
 100         OSFOPT_POCP,            /* Partial Order Connection Permitted */
 101         OSFOPT_POSP,            /* Partial Order Service Profile */
 102
 103         /* Others are not used in the current OSF */
 104         OSFOPT_EMPTY = 255,
 105 };
 106
 107 /*
 108  * Initial window size option state machine: multiple of mss, mtu or
 109  * plain numeric value. Can also be made as plain numeric value which
 110  * is not a multiple of specified value.
 111  */
 112 enum xt_osf_window_size_options {
 113         OSF_WSS_PLAIN   = 0,
 114         OSF_WSS_MSS,
 115         OSF_WSS_MTU,
 116         OSF_WSS_MODULO,
 117         OSF_WSS_MAX,
 118 };
 119
 120 /*
 121  * Add/remove fingerprint from the kernel.
 122  */
 123 enum xt_osf_msg_types {
 124         OSF_MSG_ADD,
 125         OSF_MSG_REMOVE,
 126         OSF_MSG_MAX,
 127 };
 128
 129 enum xt_osf_attr_type {
 130         OSF_ATTR_UNSPEC,
 131         OSF_ATTR_FINGER,
 132         OSF_ATTR_MAX,
 133 };
 134
 135 #endif                          /* _XT_OSF_H */