Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 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 |
Christopher Ferris | e084501 | 2014-07-09 14:58:51 -0700 | [diff] [blame] | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 17 | */ |
| 18 | |
| 19 | #ifndef _XT_OSF_H |
| 20 | #define _XT_OSF_H |
| 21 | |
| 22 | #include <linux/types.h> |
Christopher Ferris | ccfaccd | 2016-08-24 12:11:31 -0700 | [diff] [blame^] | 23 | #include <linux/ip.h> |
| 24 | #include <linux/tcp.h> |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 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 */ |