| 1 | /* lint -save -library Flexelint comment for external headers */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 2001 Charles Mott <cm@linktel.net>
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | *
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| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 26 | * SUCH DAMAGE.
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| 27 | *
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| 28 | * $FreeBSD: src/sys/netinet/libalias/alias.h,v 1.34.8.1 2009/04/15 03:14:26 kensmith Exp $
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| 29 | */
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| 30 |
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| 31 | /*
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| 32 | * Alias.h defines the outside world interfaces for the packet aliasing
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| 33 | * software.
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| 34 | *
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| 35 | * This software is placed into the public domain with no restrictions on its
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| 36 | * distribution.
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| 37 | */
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| 38 |
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| 39 | #ifndef _ALIAS_H_
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| 40 | #define _ALIAS_H_
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| 41 |
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| 42 | #ifndef VBOX
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| 43 | #include <netinet/in_systm.h>
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| 44 | #include <netinet/in.h>
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| 45 | #include <netinet/ip.h>
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| 46 | #else
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| 47 | # include <slirp.h>
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| 48 | #endif
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| 49 |
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| 50 | #define LIBALIAS_BUF_SIZE 128
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| 51 | #ifdef _KERNEL
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| 52 | /*
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| 53 | * The kernel version of libalias does not support these features.
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| 54 | */
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| 55 | #define NO_FW_PUNCH
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| 56 | #define NO_USE_SOCKETS
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| 57 | #endif
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| 58 |
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| 59 | /*
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| 60 | * The external interface to libalias, the packet aliasing engine.
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| 61 | *
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| 62 | * There are two sets of functions:
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| 63 | *
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| 64 | * PacketAlias*() the old API which doesn't take an instance pointer
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| 65 | * and therefore can only have one packet engine at a time.
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| 66 | *
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| 67 | * LibAlias*() the new API which takes as first argument a pointer to
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| 68 | * the instance of the packet aliasing engine.
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| 69 | *
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| 70 | * The functions otherwise correspond to each other one for one, except
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| 71 | * for the LibAliasUnaliasOut()/PacketUnaliasOut() function which were
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| 72 | * were misnamed in the old API.
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| 73 | */
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| 74 |
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| 75 | /*
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| 76 | * The instance structure
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| 77 | */
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| 78 | struct libalias;
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| 79 | #if defined(VBOX) && !defined(VBOX_SLIRP_ALIAS)
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| 80 | /* XXX: used only for browsing */
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| 81 | struct libalias {
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| 82 | LIST_ENTRY(libalias) instancelist;
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| 83 | };
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| 84 | #endif
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| 85 |
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| 86 | /*
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| 87 | * An anonymous structure, a pointer to which is returned from
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| 88 | * PacketAliasRedirectAddr(), PacketAliasRedirectPort() or
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| 89 | * PacketAliasRedirectProto(), passed to PacketAliasAddServer(),
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| 90 | * and freed by PacketAliasRedirectDelete().
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| 91 | */
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| 92 | struct alias_link;
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| 93 |
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| 94 |
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| 95 | /* OLD API */
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| 96 |
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| 97 | /* Initialization and control functions. */
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| 98 | void PacketAliasInit(void);
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| 99 | void PacketAliasSetAddress(struct in_addr _addr);
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| 100 | void PacketAliasSetFWBase(unsigned int _base, unsigned int _num);
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| 101 | void PacketAliasSetSkinnyPort(unsigned int _port);
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| 102 | unsigned int
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| 103 | PacketAliasSetMode(unsigned int _flags, unsigned int _mask);
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| 104 | void PacketAliasUninit(void);
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| 105 |
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| 106 | /* Packet Handling functions. */
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| 107 | int PacketAliasIn(char *_ptr, int _maxpacketsize);
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| 108 | int PacketAliasOut(char *_ptr, int _maxpacketsize);
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| 109 | int PacketUnaliasOut(char *_ptr, int _maxpacketsize);
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| 110 |
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| 111 | /* Port and address redirection functions. */
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| 112 |
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| 113 |
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| 114 | int
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| 115 | PacketAliasAddServer(struct alias_link *_lnk,
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| 116 | struct in_addr _addr, unsigned short _port);
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| 117 | struct alias_link *
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| 118 | PacketAliasRedirectAddr(struct in_addr _src_addr,
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| 119 | struct in_addr _alias_addr);
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| 120 | int PacketAliasRedirectDynamic(struct alias_link *_lnk);
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| 121 | void PacketAliasRedirectDelete(struct alias_link *_lnk);
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| 122 | struct alias_link *
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| 123 | PacketAliasRedirectPort(struct in_addr _src_addr,
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| 124 | unsigned short _src_port, struct in_addr _dst_addr,
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| 125 | unsigned short _dst_port, struct in_addr _alias_addr,
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| 126 | unsigned short _alias_port, unsigned char _proto);
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| 127 | struct alias_link *
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| 128 | PacketAliasRedirectProto(struct in_addr _src_addr,
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| 129 | struct in_addr _dst_addr, struct in_addr _alias_addr,
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| 130 | unsigned char _proto);
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| 131 |
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| 132 | /* Fragment Handling functions. */
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| 133 | void PacketAliasFragmentIn(char *_ptr, char *_ptr_fragment);
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| 134 | char *PacketAliasGetFragment(char *_ptr);
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| 135 | int PacketAliasSaveFragment(char *_ptr);
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| 136 |
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| 137 | /* Miscellaneous functions. */
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| 138 | int PacketAliasCheckNewLink(void);
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| 139 | unsigned short
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| 140 | PacketAliasInternetChecksum(unsigned short *_ptr, int _nbytes);
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| 141 | void PacketAliasSetTarget(struct in_addr _target_addr);
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| 142 |
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| 143 | /* Transparent proxying routines. */
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| 144 | int PacketAliasProxyRule(const char *_cmd);
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| 145 |
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| 146 | /* NEW API */
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| 147 |
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| 148 | /* Initialization and control functions. */
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| 149 | #ifndef VBOX
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| 150 | struct libalias *LibAliasInit(struct libalias *);
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| 151 | #else
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| 152 | struct libalias *LibAliasInit(PNATState, struct libalias *);
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| 153 | #endif
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| 154 | void LibAliasSetAddress(struct libalias *, struct in_addr _addr);
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| 155 | void LibAliasSetFWBase(struct libalias *, unsigned int _base, unsigned int _num);
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| 156 | void LibAliasSetSkinnyPort(struct libalias *, unsigned int _port);
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| 157 | unsigned int
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| 158 | LibAliasSetMode(struct libalias *, unsigned int _flags, unsigned int _mask);
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| 159 | void LibAliasUninit(struct libalias *);
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| 160 |
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| 161 | /* Packet Handling functions. */
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| 162 | int LibAliasIn (struct libalias *, char *_ptr, int _maxpacketsize);
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| 163 | int LibAliasOut(struct libalias *, char *_ptr, int _maxpacketsize);
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| 164 | int LibAliasOutTry(struct libalias *, char *_ptr, int _maxpacketsize, int _create);
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| 165 | int LibAliasUnaliasOut(struct libalias *, char *_ptr, int _maxpacketsize);
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| 166 |
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| 167 | /* Port and address redirection functions. */
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| 168 |
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| 169 | int
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| 170 | LibAliasAddServer(struct libalias *, struct alias_link *_lnk,
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| 171 | struct in_addr _addr, unsigned short _port);
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| 172 | struct alias_link *
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| 173 | LibAliasRedirectAddr(struct libalias *, struct in_addr _src_addr,
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| 174 | struct in_addr _alias_addr);
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| 175 | int LibAliasRedirectDynamic(struct libalias *, struct alias_link *_lnk);
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| 176 | void LibAliasRedirectDelete(struct libalias *, struct alias_link *_lnk);
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| 177 | struct alias_link *
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| 178 | LibAliasRedirectPort(struct libalias *, struct in_addr _src_addr,
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| 179 | unsigned short _src_port, struct in_addr _dst_addr,
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| 180 | unsigned short _dst_port, struct in_addr _alias_addr,
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| 181 | unsigned short _alias_port, unsigned char _proto);
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| 182 | struct alias_link *
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| 183 | LibAliasRedirectProto(struct libalias *, struct in_addr _src_addr,
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| 184 | struct in_addr _dst_addr, struct in_addr _alias_addr,
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| 185 | unsigned char _proto);
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| 186 |
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| 187 | /* Fragment Handling functions. */
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| 188 | void LibAliasFragmentIn(struct libalias *, char *_ptr, char *_ptr_fragment);
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| 189 | char *LibAliasGetFragment(struct libalias *, char *_ptr);
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| 190 | int LibAliasSaveFragment(struct libalias *, char *_ptr);
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| 191 |
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| 192 | /* Miscellaneous functions. */
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| 193 | int LibAliasCheckNewLink(struct libalias *);
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| 194 | unsigned short
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| 195 | LibAliasInternetChecksum(struct libalias *, unsigned short *_ptr, int _nbytes);
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| 196 | void LibAliasSetTarget(struct libalias *, struct in_addr _target_addr);
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| 197 |
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| 198 | /* Transparent proxying routines. */
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| 199 | int LibAliasProxyRule(struct libalias *, const char *_cmd);
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| 200 |
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| 201 | /* Module handling API */
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| 202 | int LibAliasLoadModule(char *);
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| 203 | int LibAliasUnLoadAllModule(void);
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| 204 | int LibAliasRefreshModules(void);
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| 205 |
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| 206 | /* Mbuf helper function. */
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| 207 | #ifndef VBOX
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| 208 | struct mbuf *m_megapullup(struct mbuf *, int);
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| 209 | #else
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| 210 | struct mbuf *m_megapullup(PNATState, struct mbuf *, int);
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| 211 | #endif
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| 212 |
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| 213 | /*
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| 214 | * Mode flags and other constants.
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| 215 | */
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| 216 |
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| 217 |
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| 218 | /* Mode flags, set using PacketAliasSetMode() */
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| 219 |
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| 220 | /*
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| 221 | * If PKT_ALIAS_LOG is set, a message will be printed to /var/log/alias.log
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| 222 | * every time a link is created or deleted. This is useful for debugging.
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| 223 | */
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| 224 | #define PKT_ALIAS_LOG 0x01
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| 225 |
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| 226 | /*
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| 227 | * If PKT_ALIAS_DENY_INCOMING is set, then incoming connections (e.g. to ftp,
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| 228 | * telnet or web servers will be prevented by the aliasing mechanism.
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| 229 | */
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| 230 | #define PKT_ALIAS_DENY_INCOMING 0x02
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| 231 |
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| 232 | /*
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| 233 | * If PKT_ALIAS_SAME_PORTS is set, packets will be attempted sent from the
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| 234 | * same port as they originated on. This allows e.g. rsh to work *99% of the
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| 235 | * time*, but _not_ 100% (it will be slightly flakey instead of not working
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| 236 | * at all). This mode bit is set by PacketAliasInit(), so it is a default
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| 237 | * mode of operation.
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| 238 | */
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| 239 | #define PKT_ALIAS_SAME_PORTS 0x04
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| 240 |
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| 241 | /*
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| 242 | * If PKT_ALIAS_USE_SOCKETS is set, then when partially specified links (e.g.
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| 243 | * destination port and/or address is zero), the packet aliasing engine will
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| 244 | * attempt to allocate a socket for the aliasing port it chooses. This will
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| 245 | * avoid interference with the host machine. Fully specified links do not
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| 246 | * require this. This bit is set after a call to PacketAliasInit(), so it is
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| 247 | * a default mode of operation.
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| 248 | */
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| 249 | #ifndef NO_USE_SOCKETS
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| 250 | #define PKT_ALIAS_USE_SOCKETS 0x08
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| 251 | #endif
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| 252 | /*-
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| 253 | * If PKT_ALIAS_UNREGISTERED_ONLY is set, then only packets with
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| 254 | * unregistered source addresses will be aliased. Private
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| 255 | * addresses are those in the following ranges:
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| 256 | *
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| 257 | * 10.0.0.0 -> 10.255.255.255
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| 258 | * 172.16.0.0 -> 172.31.255.255
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| 259 | * 192.168.0.0 -> 192.168.255.255
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| 260 | */
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| 261 | #define PKT_ALIAS_UNREGISTERED_ONLY 0x10
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| 262 |
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| 263 | /*
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| 264 | * If PKT_ALIAS_RESET_ON_ADDR_CHANGE is set, then the table of dynamic
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| 265 | * aliasing links will be reset whenever PacketAliasSetAddress() changes the
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| 266 | * default aliasing address. If the default aliasing address is left
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| 267 | * unchanged by this function call, then the table of dynamic aliasing links
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| 268 | * will be left intact. This bit is set after a call to PacketAliasInit().
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| 269 | */
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| 270 | #define PKT_ALIAS_RESET_ON_ADDR_CHANGE 0x20
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| 271 |
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| 272 | #ifndef NO_FW_PUNCH
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| 273 | /*
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| 274 | * If PKT_ALIAS_PUNCH_FW is set, active FTP and IRC DCC connections will
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| 275 | * create a 'hole' in the firewall to allow the transfers to work. The
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| 276 | * ipfw rule number that the hole is created with is controlled by
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| 277 | * PacketAliasSetFWBase(). The hole will be attached to that
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| 278 | * particular alias_link, so when the link goes away the hole is deleted.
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| 279 | */
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| 280 | #define PKT_ALIAS_PUNCH_FW 0x100
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| 281 | #endif
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| 282 |
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| 283 | /*
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| 284 | * If PKT_ALIAS_PROXY_ONLY is set, then NAT will be disabled and only
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| 285 | * transparent proxying is performed.
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| 286 | */
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| 287 | #define PKT_ALIAS_PROXY_ONLY 0x40
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| 288 |
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| 289 | /*
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| 290 | * If PKT_ALIAS_REVERSE is set, the actions of PacketAliasIn() and
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| 291 | * PacketAliasOut() are reversed.
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| 292 | */
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| 293 | #define PKT_ALIAS_REVERSE 0x80
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| 294 |
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| 295 | /* Function return codes. */
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| 296 | #define PKT_ALIAS_ERROR -1
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| 297 | #define PKT_ALIAS_OK 1
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| 298 | #define PKT_ALIAS_IGNORED 2
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| 299 | #define PKT_ALIAS_UNRESOLVED_FRAGMENT 3
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| 300 | #define PKT_ALIAS_FOUND_HEADER_FRAGMENT 4
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| 301 |
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| 302 | #endif /* !_ALIAS_H_ */
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| 303 |
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| 304 | /* lint -restore */
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