1/* 2 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * The contents of this file constitute Original Code as defined in and 7 * are subject to the Apple Public Source License Version 1.1 (the 8 * "License"). You may not use this file except in compliance with the 9 * License. Please obtain a copy of the License at 10 * http://www.apple.com/publicsource and read it before using this file. 11 * 12 * This Original Code and all software distributed under the License are 13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER 14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the 17 * License for the specific language governing rights and limitations 18 * under the License. 19 * 20 * @APPLE_LICENSE_HEADER_END@ 21 */ 22/*- 23 * Copyright (c) 2001 Charles Mott <cmott@scientech.com> 24 * All rights reserved. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 1. Redistributions of source code must retain the above copyright 30 * notice, this list of conditions and the following disclaimer. 31 * 2. Redistributions in binary form must reproduce the above copyright 32 * notice, this list of conditions and the following disclaimer in the 33 * documentation and/or other materials provided with the distribution. 34 * 35 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 36 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 38 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 39 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 40 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 41 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 42 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 43 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 44 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 45 * SUCH DAMAGE. 46 * 47 * Based upon: 48 * $FreeBSD: src/lib/libalias/alias.h,v 1.12.2.4 2001/08/01 09:36:40 obrien Exp $ 49 */ 50 51/*- 52 * Alias.h defines the outside world interfaces for the packet aliasing 53 * software. 54 * 55 * This software is placed into the public domain with no restrictions on its 56 * distribution. 57 */ 58 59#ifndef _ALIAS_H_ 60#define _ALIAS_H_ 61 62/* Alias link representative (incomplete struct) */ 63struct alias_link; 64 65/* External interfaces (API) to packet aliasing engine */ 66 67/* Initialization and Control */ 68 extern void 69 PacketAliasInit(void); 70 71 extern void 72 PacketAliasUninit(void); 73 74 extern void 75 PacketAliasSetAddress(struct in_addr); 76 77 extern unsigned int 78 PacketAliasSetMode(unsigned int, unsigned int); 79 80#ifndef NO_FW_PUNCH 81 extern void 82 PacketAliasSetFWBase(unsigned int, unsigned int); 83#endif 84 85 extern void 86 PacketAliasClampMSS(u_short mss); 87 88/* Packet Handling */ 89 extern int 90 PacketAliasIn(char *, int maxpacketsize); 91 92 extern int 93 PacketAliasOut(char *, int maxpacketsize); 94 95 extern int 96 PacketUnaliasOut(char *, int maxpacketsize); 97 98/* Port and Address Redirection */ 99 extern struct alias_link * 100 PacketAliasRedirectPort(struct in_addr, u_short, 101 struct in_addr, u_short, 102 struct in_addr, u_short, 103 u_char); 104 105 extern int 106 PacketAliasAddServer(struct alias_link *link, 107 struct in_addr addr, 108 u_short port); 109 110 extern struct alias_link * 111 PacketAliasRedirectProto(struct in_addr, 112 struct in_addr, 113 struct in_addr, 114 u_char); 115 116 extern struct alias_link * 117 PacketAliasRedirectAddr(struct in_addr, 118 struct in_addr); 119 120 extern void 121 PacketAliasRedirectDelete(struct alias_link *); 122 123/* Fragment Handling */ 124 extern int 125 PacketAliasSaveFragment(char *); 126 127 extern char * 128 PacketAliasGetFragment(char *); 129 130 extern void 131 PacketAliasFragmentIn(char *, char *); 132 133/* Miscellaneous Functions */ 134 extern void 135 PacketAliasSetTarget(struct in_addr addr); 136 137 extern int 138 PacketAliasCheckNewLink(void); 139 140 extern u_short 141 PacketAliasInternetChecksum(u_short *, int); 142 143/* Transparent Proxying */ 144 extern int 145 PacketAliasProxyRule(const char *); 146 147 148/********************** Mode flags ********************/ 149/* Set these flags using PacketAliasSetMode() */ 150 151/* If PKT_ALIAS_LOG is set, a message will be printed to 152 /var/log/alias.log every time a link is created or deleted. This 153 is useful for debugging */ 154#define PKT_ALIAS_LOG 0x01 155 156/* If PKT_ALIAS_DENY_INCOMING is set, then incoming connections (e.g. 157 to ftp, telnet or web servers will be prevented by the aliasing 158 mechanism. */ 159#define PKT_ALIAS_DENY_INCOMING 0x02 160 161/* If PKT_ALIAS_SAME_PORTS is set, packets will be attempted sent from 162 the same port as they originated on. This allows e.g. rsh to work 163 *99% of the time*, but _not_ 100%. (It will be slightly flakey 164 instead of not working at all.) This mode bit is set by 165 PacketAliasInit(), so it is a default mode of operation. */ 166#define PKT_ALIAS_SAME_PORTS 0x04 167 168/* If PKT_ALIAS_USE_SOCKETS is set, then when partially specified 169 links (e.g. destination port and/or address is zero), the packet 170 aliasing engine will attempt to allocate a socket for the aliasing 171 port it chooses. This will avoid interference with the host 172 machine. Fully specified links do not require this. This bit 173 is set after a call to PacketAliasInit(), so it is a default 174 mode of operation. */ 175#define PKT_ALIAS_USE_SOCKETS 0x08 176 177/* If PKT_ALIAS_UNREGISTERED_ONLY is set, then only packets with 178 unregistered source addresses will be aliased. Private 179 addresses are those in the following ranges: 180 10.0.0.0 -> 10.255.255.255 181 172.16.0.0 -> 172.31.255.255 182 192.168.0.0 -> 192.168.255.255 */ 183#define PKT_ALIAS_UNREGISTERED_ONLY 0x10 184 185/* If PKT_ALIAS_RESET_ON_ADDR_CHANGE is set, then the table of dynamic 186 aliasing links will be reset whenever PacketAliasSetAddress() 187 changes the default aliasing address. If the default aliasing 188 address is left unchanged by this function call, then the 189 table of dynamic aliasing links will be left intact. This 190 bit is set after a call to PacketAliasInit(). */ 191#define PKT_ALIAS_RESET_ON_ADDR_CHANGE 0x20 192 193#ifndef NO_FW_PUNCH 194/* If PKT_ALIAS_PUNCH_FW is set, active FTP and IRC DCC connections 195 will create a 'hole' in the firewall to allow the transfers to 196 work. Where (IPFW "line-numbers") the hole is created is 197 controlled by PacketAliasSetFWBase(base, size). The hole will be 198 attached to that particular alias_link, so when the link goes away 199 so do the hole. */ 200#define PKT_ALIAS_PUNCH_FW 0x100 201#endif 202 203/* If PKT_ALIAS_PROXY_ONLY is set, then NAT will be disabled and only 204 transparent proxying performed */ 205#define PKT_ALIAS_PROXY_ONLY 0x40 206 207/* If PKT_ALIAS_REVERSE is set, the actions of PacketAliasIn() 208 and PacketAliasOut() are reversed */ 209#define PKT_ALIAS_REVERSE 0x80 210 211/* Return Codes */ 212#define PKT_ALIAS_ERROR -1 213#define PKT_ALIAS_OK 1 214#define PKT_ALIAS_IGNORED 2 215#define PKT_ALIAS_UNRESOLVED_FRAGMENT 3 216#define PKT_ALIAS_FOUND_HEADER_FRAGMENT 4 217 218#endif 219/* lint -restore */ 220