fe267a5590
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
241 lines
8.3 KiB
C
241 lines
8.3 KiB
C
/* lint -save -library Flexelint comment for external headers */
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2001 Charles Mott <cm@linktel.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Alias.h defines the outside world interfaces for the packet aliasing
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* software.
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*
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* This software is placed into the public domain with no restrictions on its
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* distribution.
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*/
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#ifndef _ALIAS_H_
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#define _ALIAS_H_
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#define LIBALIAS_BUF_SIZE 128
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#ifdef _KERNEL
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/*
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* The kernel version of libalias does not support these features.
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*/
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#define NO_FW_PUNCH
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#define NO_USE_SOCKETS
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#endif
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/*
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* The external interface to libalias, the packet aliasing engine.
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*
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* There are two sets of functions:
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*
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* PacketAlias*() the old API which doesn't take an instance pointer
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* and therefore can only have one packet engine at a time.
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*
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* LibAlias*() the new API which takes as first argument a pointer to
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* the instance of the packet aliasing engine.
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*
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* The functions otherwise correspond to each other one for one, except
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* for the LibAliasUnaliasOut()/PacketUnaliasOut() function which were
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* were misnamed in the old API.
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*/
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/*
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* The instance structure
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*/
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struct libalias;
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/*
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* An anonymous structure, a pointer to which is returned from
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* PacketAliasRedirectAddr(), PacketAliasRedirectPort() or
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* PacketAliasRedirectProto(), passed to PacketAliasAddServer(),
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* and freed by PacketAliasRedirectDelete().
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*/
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struct alias_link;
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/* Initialization and control functions. */
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struct libalias *LibAliasInit(struct libalias *);
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void LibAliasSetAddress(struct libalias *, struct in_addr _addr);
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void LibAliasSetFWBase(struct libalias *, unsigned int _base, unsigned int _num);
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void LibAliasSetSkinnyPort(struct libalias *, unsigned int _port);
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unsigned int
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LibAliasSetMode(struct libalias *, unsigned int _flags, unsigned int _mask);
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void LibAliasUninit(struct libalias *);
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/* Packet Handling functions. */
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int LibAliasIn (struct libalias *, char *_ptr, int _maxpacketsize);
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int LibAliasOut(struct libalias *, char *_ptr, int _maxpacketsize);
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int LibAliasOutTry(struct libalias *, char *_ptr, int _maxpacketsize, int _create);
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int LibAliasUnaliasOut(struct libalias *, char *_ptr, int _maxpacketsize);
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/* Port and address redirection functions. */
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int
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LibAliasAddServer(struct libalias *, struct alias_link *_lnk,
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struct in_addr _addr, unsigned short _port);
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struct alias_link *
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LibAliasRedirectAddr(struct libalias *, struct in_addr _src_addr,
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struct in_addr _alias_addr);
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int LibAliasRedirectDynamic(struct libalias *, struct alias_link *_lnk);
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void LibAliasRedirectDelete(struct libalias *, struct alias_link *_lnk);
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struct alias_link *
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LibAliasRedirectPort(struct libalias *, struct in_addr _src_addr,
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unsigned short _src_port, struct in_addr _dst_addr,
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unsigned short _dst_port, struct in_addr _alias_addr,
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unsigned short _alias_port, unsigned char _proto);
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struct alias_link *
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LibAliasRedirectProto(struct libalias *, struct in_addr _src_addr,
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struct in_addr _dst_addr, struct in_addr _alias_addr,
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unsigned char _proto);
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/* Fragment Handling functions. */
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void LibAliasFragmentIn(struct libalias *, char *_ptr, char *_ptr_fragment);
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char *LibAliasGetFragment(struct libalias *, char *_ptr);
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int LibAliasSaveFragment(struct libalias *, char *_ptr);
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/* Miscellaneous functions. */
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int LibAliasCheckNewLink(struct libalias *);
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unsigned short
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LibAliasInternetChecksum(struct libalias *, unsigned short *_ptr, int _nbytes);
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void LibAliasSetTarget(struct libalias *, struct in_addr _target_addr);
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/* Transparent proxying routines. */
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int LibAliasProxyRule(struct libalias *, const char *_cmd);
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/* Module handling API */
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int LibAliasLoadModule(char *);
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int LibAliasUnLoadAllModule(void);
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int LibAliasRefreshModules(void);
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/* Mbuf helper function. */
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struct mbuf *m_megapullup(struct mbuf *, int);
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/*
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* Mode flags and other constants.
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*/
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/* Mode flags, set using PacketAliasSetMode() */
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/*
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* If PKT_ALIAS_LOG is set, a message will be printed to /var/log/alias.log
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* every time a link is created or deleted. This is useful for debugging.
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*/
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#define PKT_ALIAS_LOG 0x01
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/*
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* If PKT_ALIAS_DENY_INCOMING is set, then incoming connections (e.g. to ftp,
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* telnet or web servers will be prevented by the aliasing mechanism.
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*/
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#define PKT_ALIAS_DENY_INCOMING 0x02
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/*
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* If PKT_ALIAS_SAME_PORTS is set, packets will be attempted sent from the
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* same port as they originated on. This allows e.g. rsh to work *99% of the
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* time*, but _not_ 100% (it will be slightly flakey instead of not working
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* at all). This mode bit is set by PacketAliasInit(), so it is a default
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* mode of operation.
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*/
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#define PKT_ALIAS_SAME_PORTS 0x04
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/*
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* If PKT_ALIAS_USE_SOCKETS is set, then when partially specified links (e.g.
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* destination port and/or address is zero), the packet aliasing engine will
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* attempt to allocate a socket for the aliasing port it chooses. This will
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* avoid interference with the host machine. Fully specified links do not
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* require this. This bit is set after a call to PacketAliasInit(), so it is
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* a default mode of operation.
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*/
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#ifndef NO_USE_SOCKETS
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#define PKT_ALIAS_USE_SOCKETS 0x08
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#endif
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/*-
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* If PKT_ALIAS_UNREGISTERED_ONLY is set, then only packets with
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* unregistered source addresses will be aliased. Private
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* addresses are those in the following ranges:
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*
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* 10.0.0.0 -> 10.255.255.255
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* 172.16.0.0 -> 172.31.255.255
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* 192.168.0.0 -> 192.168.255.255
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*/
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#define PKT_ALIAS_UNREGISTERED_ONLY 0x10
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/*
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* If PKT_ALIAS_RESET_ON_ADDR_CHANGE is set, then the table of dynamic
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* aliasing links will be reset whenever PacketAliasSetAddress() changes the
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* default aliasing address. If the default aliasing address is left
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* unchanged by this function call, then the table of dynamic aliasing links
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* will be left intact. This bit is set after a call to PacketAliasInit().
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*/
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#define PKT_ALIAS_RESET_ON_ADDR_CHANGE 0x20
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/*
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* If PKT_ALIAS_PROXY_ONLY is set, then NAT will be disabled and only
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* transparent proxying is performed.
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*/
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#define PKT_ALIAS_PROXY_ONLY 0x40
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/*
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* If PKT_ALIAS_REVERSE is set, the actions of PacketAliasIn() and
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* PacketAliasOut() are reversed.
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*/
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#define PKT_ALIAS_REVERSE 0x80
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#ifndef NO_FW_PUNCH
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/*
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* If PKT_ALIAS_PUNCH_FW is set, active FTP and IRC DCC connections will
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* create a 'hole' in the firewall to allow the transfers to work. The
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* ipfw rule number that the hole is created with is controlled by
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* PacketAliasSetFWBase(). The hole will be attached to that
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* particular alias_link, so when the link goes away the hole is deleted.
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*/
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#define PKT_ALIAS_PUNCH_FW 0x100
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#endif
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/*
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* If PKT_ALIAS_SKIP_GLOBAL is set, nat instance is not checked for matching
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* states in 'ipfw nat global' rule.
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*/
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#define PKT_ALIAS_SKIP_GLOBAL 0x200
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/* Function return codes. */
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#define PKT_ALIAS_ERROR -1
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#define PKT_ALIAS_OK 1
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#define PKT_ALIAS_IGNORED 2
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#define PKT_ALIAS_UNRESOLVED_FRAGMENT 3
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#define PKT_ALIAS_FOUND_HEADER_FRAGMENT 4
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#endif /* !_ALIAS_H_ */
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/* lint -restore */
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