LXR linux/include/uapi/linux/netfilter/xt

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