include/uapi/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, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifndef _XT_OSF_H
  20 #define _XT_OSF_H
  21
  22 #include <linux/types.h>
  23 #include <linux/ip.h>
  24 #include <linux/tcp.h>
  25
  26 #define MAXGENRELEN             32
  27
  28 #define XT_OSF_GENRE            (1<<0)
  29 #define XT_OSF_TTL              (1<<1)
  30 #define XT_OSF_LOG              (1<<2)
  31 #define XT_OSF_INVERT           (1<<3)
  32
  33 #define XT_OSF_LOGLEVEL_ALL     0       /* log all matched fingerprints */
  34 #define XT_OSF_LOGLEVEL_FIRST   1       /* log only the first matced fingerprint */
  35 #define XT_OSF_LOGLEVEL_ALL_KNOWN       2 /* do not log unknown packets */
  36
  37 #define XT_OSF_TTL_TRUE         0       /* True ip and fingerprint TTL comparison */
  38 #define XT_OSF_TTL_LESS         1       /* Check if ip TTL is less than fingerprint one */
  39 #define XT_OSF_TTL_NOCHECK      2       /* Do not compare ip and fingerprint TTL at all */
  40
  41 struct xt_osf_info {
  42         char                    genre[MAXGENRELEN];
  43         __u32                   len;
  44         __u32                   flags;
  45         __u32                   loglevel;
  46         __u32                   ttl;
  47 };
  48
  49 /*
  50  * Wildcard MSS (kind of).
  51  * It is used to implement a state machine for the different wildcard values
  52  * of the MSS and window sizes.
  53  */
  54 struct xt_osf_wc {
  55         __u32                   wc;
  56         __u32                   val;
  57 };
  58
  59 /*
  60  * This struct represents IANA options
  61  * http://www.iana.org/assignments/tcp-parameters
  62  */
  63 struct xt_osf_opt {
  64         __u16                   kind, length;
  65         struct xt_osf_wc        wc;
  66 };
  67
  68 struct xt_osf_user_finger {
  69         struct xt_osf_wc        wss;
  70
  71         __u8                    ttl, df;
  72         __u16                   ss, mss;
  73         __u16                   opt_num;
  74
  75         char                    genre[MAXGENRELEN];
  76         char                    version[MAXGENRELEN];
  77         char                    subtype[MAXGENRELEN];
  78
  79         /* MAX_IPOPTLEN is maximum if all options are NOPs or EOLs */
  80         struct xt_osf_opt       opt[MAX_IPOPTLEN];
  81 };
  82
  83 struct xt_osf_nlmsg {
  84         struct xt_osf_user_finger       f;
  85         struct iphdr            ip;
  86         struct tcphdr           tcp;
  87 };
  88
  89 /* Defines for IANA option kinds */
  90
  91 enum iana_options {
  92         OSFOPT_EOL = 0,         /* End of options */
  93         OSFOPT_NOP,             /* NOP */
  94         OSFOPT_MSS,             /* Maximum segment size */
  95         OSFOPT_WSO,             /* Window scale option */
  96         OSFOPT_SACKP,           /* SACK permitted */
  97         OSFOPT_SACK,            /* SACK */
  98         OSFOPT_ECHO,
  99         OSFOPT_ECHOREPLY,
 100         OSFOPT_TS,              /* Timestamp option */
 101         OSFOPT_POCP,            /* Partial Order Connection Permitted */
 102         OSFOPT_POSP,            /* Partial Order Service Profile */
 103
 104         /* Others are not used in the current OSF */
 105         OSFOPT_EMPTY = 255,
 106 };
 107
 108 /*
 109  * Initial window size option state machine: multiple of mss, mtu or
 110  * plain numeric value. Can also be made as plain numeric value which
 111  * is not a multiple of specified value.
 112  */
 113 enum xt_osf_window_size_options {
 114         OSF_WSS_PLAIN   = 0,
 115         OSF_WSS_MSS,
 116         OSF_WSS_MTU,
 117         OSF_WSS_MODULO,
 118         OSF_WSS_MAX,
 119 };
 120
 121 /*
 122  * Add/remove fingerprint from the kernel.
 123  */
 124 enum xt_osf_msg_types {
 125         OSF_MSG_ADD,
 126         OSF_MSG_REMOVE,
 127         OSF_MSG_MAX,
 128 };
 129
 130 enum xt_osf_attr_type {
 131         OSF_ATTR_UNSPEC,
 132         OSF_ATTR_FINGER,
 133         OSF_ATTR_MAX,
 134 };
 135
 136 #endif                          /* _XT_OSF_H */