2001-06-04 15:09:51 +00:00
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/*-
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2001-11-03 11:34:09 +00:00
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* Copyright (c) 2001 Charles Mott <cm@linktel.net>
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2001-06-04 15:09:51 +00:00
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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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1999-02-27 02:16:01 +00:00
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/*
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2001-03-25 12:05:10 +00:00
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* Alias_local.h contains the function prototypes for alias.c,
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* alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well
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* as any future add-ons). It also includes macros, globals and
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* struct definitions shared by more than one alias*.c file.
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*
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* This include file is intended to be used only within the aliasing
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* software. Outside world interfaces are defined in alias.h
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*
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* This software is placed into the public domain with no restrictions
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* on its distribution.
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*
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2002-07-01 11:19:40 +00:00
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* Initial version: August, 1996 (cjm)
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2001-03-25 12:05:10 +00:00
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*
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* <updated several times by original author and Eivind Eklund>
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1999-02-27 02:16:01 +00:00
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*/
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2001-03-25 12:05:10 +00:00
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#ifndef _ALIAS_LOCAL_H_
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#define _ALIAS_LOCAL_H_
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1999-02-27 02:16:01 +00:00
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2004-01-17 10:52:21 +00:00
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#include <sys/queue.h>
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2005-05-05 21:05:38 +00:00
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/* Use kernel allocator. */
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#if defined(_KERNEL) && defined(_SYS_MALLOC_H_)
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MALLOC_DECLARE(M_ALIAS);
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#define malloc(x) malloc(x, M_ALIAS, M_NOWAIT|M_ZERO)
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#define calloc(x, n) malloc(x*n)
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#define free(x) free(x, M_ALIAS)
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#endif
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/* XXX: LibAliasSetTarget() uses this constant. */
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#ifdef _KERNEL
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#define INADDR_NONE 0xffffffff
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#endif
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2004-01-17 10:52:21 +00:00
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/* Sizes of input and output link tables */
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#define LINK_TABLE_OUT_SIZE 101
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#define LINK_TABLE_IN_SIZE 4001
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struct proxy_entry;
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struct libalias {
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2004-03-16 21:30:41 +00:00
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LIST_ENTRY(libalias) instancelist;
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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int packetAliasMode; /* Mode flags */
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/* - documented in alias.h */
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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struct in_addr aliasAddress; /* Address written onto source */
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/* field of IP packet. */
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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struct in_addr targetAddress; /* IP address incoming packets */
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/* are sent to if no aliasing */
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/* link already exists */
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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struct in_addr nullAddress; /* Used as a dummy parameter for */
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/* some function calls */
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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LIST_HEAD (, alias_link) linkTableOut[LINK_TABLE_OUT_SIZE];
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/* Lookup table of pointers to */
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/* chains of link records. Each */
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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LIST_HEAD (, alias_link) linkTableIn[LINK_TABLE_IN_SIZE];
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/* link record is doubly indexed */
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/* into input and output lookup */
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/* tables. */
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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/* Link statistics */
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int icmpLinkCount;
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int udpLinkCount;
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int tcpLinkCount;
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int pptpLinkCount;
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int protoLinkCount;
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int fragmentIdLinkCount;
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int fragmentPtrLinkCount;
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int sockCount;
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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int cleanupIndex; /* Index to chain of link table */
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/* being inspected for old links */
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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int timeStamp; /* System time in seconds for */
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/* current packet */
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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int lastCleanupTime; /* Last time
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* IncrementalCleanup() */
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/* was called */
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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int houseKeepingResidual; /* used by HouseKeeping() */
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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int deleteAllLinks; /* If equal to zero, DeleteLink() */
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/* will not remove permanent links */
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2005-05-05 20:22:09 +00:00
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#ifndef NO_LOGGING
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2004-03-16 21:30:41 +00:00
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FILE *monitorFile; /* File descriptor for link */
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2005-05-05 20:22:09 +00:00
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#endif
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2004-03-16 21:30:41 +00:00
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/* statistics monitoring file */
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2004-01-17 10:52:21 +00:00
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2004-03-16 21:30:41 +00:00
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int newDefaultLink; /* Indicates if a new aliasing */
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/* link has been created after a */
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/* call to PacketAliasIn/Out(). */
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2004-01-17 10:52:21 +00:00
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#ifndef NO_FW_PUNCH
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2004-03-16 21:30:41 +00:00
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int fireWallFD; /* File descriptor to be able to */
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/* control firewall. Opened by */
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/* PacketAliasSetMode on first */
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/* setting the PKT_ALIAS_PUNCH_FW */
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/* flag. */
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int fireWallBaseNum; /* The first firewall entry
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* free for our use */
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int fireWallNumNums; /* How many entries can we
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* use? */
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int fireWallActiveNum; /* Which entry did we last
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* use? */
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char *fireWallField; /* bool array for entries */
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2004-01-17 10:52:21 +00:00
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#endif
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2004-03-16 21:30:41 +00:00
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unsigned int skinnyPort; /* TCP port used by the Skinny */
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/* protocol. */
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2004-01-17 10:52:21 +00:00
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struct proxy_entry *proxyList;
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2004-03-16 21:30:41 +00:00
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struct in_addr true_addr; /* in network byte order. */
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u_short true_port; /* in host byte order. */
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2004-01-17 10:52:21 +00:00
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};
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2001-03-25 12:05:10 +00:00
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/* Macros */
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1999-02-27 02:16:01 +00:00
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/*
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2001-03-25 12:05:10 +00:00
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* The following macro is used to update an
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* internet checksum. "delta" is a 32-bit
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* accumulation of all the changes to the
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* checksum (adding in new 16-bit words and
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* subtracting out old words), and "cksum"
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* is the checksum value to be updated.
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*/
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#define ADJUST_CHECKSUM(acc, cksum) \
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do { \
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acc += cksum; \
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if (acc < 0) { \
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acc = -acc; \
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acc = (acc >> 16) + (acc & 0xffff); \
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acc += acc >> 16; \
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cksum = (u_short) ~acc; \
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} else { \
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acc = (acc >> 16) + (acc & 0xffff); \
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acc += acc >> 16; \
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cksum = (u_short) acc; \
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} \
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} while (0)
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1997-05-23 04:41:31 +00:00
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2001-03-25 12:05:10 +00:00
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/* Prototypes */
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1997-05-23 04:41:31 +00:00
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2005-06-27 07:36:02 +00:00
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/*
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* We do not calculate TCP checksums when libalias is a kernel
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* module, since it has no idea about checksum offloading.
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* If TCP data has changed, then we just set checksum to zero,
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* and caller must recalculate it himself.
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* In case if libalias will edit UDP data, the same approach
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* should be used.
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*/
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#ifndef _KERNEL
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2004-03-16 21:30:41 +00:00
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u_short IpChecksum(struct ip *_pip);
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u_short TcpChecksum(struct ip *_pip);
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2005-06-27 07:36:02 +00:00
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#endif
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2004-03-16 21:30:41 +00:00
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void
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2004-03-31 21:32:58 +00:00
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DifferentialChecksum(u_short * _cksum, void * _new, void * _old, int _n);
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1997-05-23 04:41:31 +00:00
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/* Internal data access */
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindIcmpIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _id_alias, int _create);
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1997-05-23 04:41:31 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindIcmpOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr,
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u_short _id, int _create);
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1997-05-23 04:41:31 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindFragmentIn1(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _ip_id);
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1997-05-23 04:41:31 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindFragmentIn2(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _ip_id);
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1997-05-23 04:41:31 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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AddFragmentPtrLink(struct libalias *la, struct in_addr _dst_addr, u_short _ip_id);
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1997-05-23 04:41:31 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindFragmentPtr(struct libalias *la, struct in_addr _dst_addr, u_short _ip_id);
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2000-04-18 10:18:21 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindProtoIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_char _proto);
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2000-04-18 10:18:21 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindProtoOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr,
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u_char _proto);
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1997-05-23 04:41:31 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindUdpTcpIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _dst_port, u_short _alias_port, u_char _proto, int _create);
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1997-05-23 04:41:31 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindUdpTcpOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr,
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u_short _src_port, u_short _dst_port, u_char _proto, int _create);
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2000-06-20 11:41:48 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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AddPptp(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr,
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struct in_addr _alias_addr, u_int16_t _src_call_id);
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2000-06-20 11:41:48 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindPptpOutByCallId(struct libalias *la, struct in_addr _src_addr,
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struct in_addr _dst_addr, u_int16_t _src_call_id);
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2000-10-30 12:39:41 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindPptpInByCallId(struct libalias *la, struct in_addr _dst_addr,
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struct in_addr _alias_addr, u_int16_t _dst_call_id);
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2000-10-30 12:39:41 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindPptpOutByPeerCallId(struct libalias *la, struct in_addr _src_addr,
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struct in_addr _dst_addr, u_int16_t _dst_call_id);
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2000-10-30 12:39:41 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindPptpInByPeerCallId(struct libalias *la, struct in_addr _dst_addr,
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struct in_addr _alias_addr, u_int16_t _alias_call_id);
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2000-07-26 23:15:46 +00:00
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struct alias_link *
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2004-03-16 21:30:41 +00:00
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FindRtspOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr,
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u_short _src_port, u_short _alias_port, u_char _proto);
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1997-05-23 04:41:31 +00:00
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struct in_addr
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2004-03-16 21:30:41 +00:00
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FindOriginalAddress(struct libalias *la, struct in_addr _alias_addr);
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1997-05-23 04:41:31 +00:00
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struct in_addr
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2004-03-16 21:30:41 +00:00
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FindAliasAddress(struct libalias *la, struct in_addr _original_addr);
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1997-05-23 04:41:31 +00:00
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/* External data access/modification */
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2004-03-16 21:30:41 +00:00
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int
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FindNewPortGroup(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _src_port, u_short _dst_port, u_short _port_count,
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u_char _proto, u_char _align);
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2004-07-05 11:10:57 +00:00
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void GetFragmentAddr(struct alias_link *_lnk, struct in_addr *_src_addr);
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void SetFragmentAddr(struct alias_link *_lnk, struct in_addr _src_addr);
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void GetFragmentPtr(struct alias_link *_lnk, char **_fptr);
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void SetFragmentPtr(struct alias_link *_lnk, char *fptr);
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void SetStateIn(struct alias_link *_lnk, int _state);
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void SetStateOut(struct alias_link *_lnk, int _state);
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int GetStateIn (struct alias_link *_lnk);
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int GetStateOut(struct alias_link *_lnk);
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2001-03-25 12:05:10 +00:00
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struct in_addr
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2004-07-05 11:10:57 +00:00
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GetOriginalAddress(struct alias_link *_lnk);
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2001-03-25 12:05:10 +00:00
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struct in_addr
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2004-07-05 11:10:57 +00:00
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GetDestAddress(struct alias_link *_lnk);
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2001-03-25 12:05:10 +00:00
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struct in_addr
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2004-07-05 11:10:57 +00:00
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GetAliasAddress(struct alias_link *_lnk);
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2001-03-25 12:05:10 +00:00
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struct in_addr
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2004-03-16 21:30:41 +00:00
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GetDefaultAliasAddress(struct libalias *la);
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void SetDefaultAliasAddress(struct libalias *la, struct in_addr _alias_addr);
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2004-07-05 11:10:57 +00:00
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u_short GetOriginalPort(struct alias_link *_lnk);
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u_short GetAliasPort(struct alias_link *_lnk);
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2001-03-25 12:05:10 +00:00
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struct in_addr
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2004-07-05 11:10:57 +00:00
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GetProxyAddress(struct alias_link *_lnk);
|
|
|
|
void SetProxyAddress(struct alias_link *_lnk, struct in_addr _addr);
|
|
|
|
u_short GetProxyPort(struct alias_link *_lnk);
|
|
|
|
void SetProxyPort(struct alias_link *_lnk, u_short _port);
|
|
|
|
void SetAckModified(struct alias_link *_lnk);
|
|
|
|
int GetAckModified(struct alias_link *_lnk);
|
|
|
|
int GetDeltaAckIn(struct ip *_pip, struct alias_link *_lnk);
|
|
|
|
int GetDeltaSeqOut(struct ip *_pip, struct alias_link *_lnk);
|
|
|
|
void AddSeq (struct ip *_pip, struct alias_link *_lnk, int _delta);
|
|
|
|
void SetExpire (struct alias_link *_lnk, int _expire);
|
2004-03-16 21:30:41 +00:00
|
|
|
void ClearCheckNewLink(struct libalias *la);
|
2004-07-05 11:10:57 +00:00
|
|
|
void SetProtocolFlags(struct alias_link *_lnk, int _pflags);
|
|
|
|
int GetProtocolFlags(struct alias_link *_lnk);
|
|
|
|
void SetDestCallId(struct alias_link *_lnk, u_int16_t _cid);
|
2004-03-16 21:30:41 +00:00
|
|
|
|
1998-06-06 21:52:37 +00:00
|
|
|
#ifndef NO_FW_PUNCH
|
2004-07-05 11:10:57 +00:00
|
|
|
void PunchFWHole(struct alias_link *_lnk);
|
2004-03-16 21:30:41 +00:00
|
|
|
|
1998-06-06 21:52:37 +00:00
|
|
|
#endif
|
1998-01-09 21:13:35 +00:00
|
|
|
|
1997-05-23 04:41:31 +00:00
|
|
|
/* Housekeeping function */
|
2004-03-16 21:30:41 +00:00
|
|
|
void HouseKeeping(struct libalias *);
|
1997-05-23 04:41:31 +00:00
|
|
|
|
|
|
|
/* Tcp specfic routines */
|
2001-03-25 12:05:10 +00:00
|
|
|
/* lint -save -library Suppress flexelint warnings */
|
1999-02-27 02:16:01 +00:00
|
|
|
|
|
|
|
/* FTP routines */
|
2004-03-16 21:30:41 +00:00
|
|
|
void
|
2004-07-05 11:10:57 +00:00
|
|
|
AliasHandleFtpOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk,
|
2004-03-16 21:30:41 +00:00
|
|
|
int _maxpacketsize);
|
1999-02-27 02:16:01 +00:00
|
|
|
|
|
|
|
/* IRC routines */
|
2004-03-16 21:30:41 +00:00
|
|
|
void
|
2004-07-05 11:10:57 +00:00
|
|
|
AliasHandleIrcOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk,
|
2004-03-16 21:30:41 +00:00
|
|
|
int _maxsize);
|
1999-02-27 02:16:01 +00:00
|
|
|
|
2000-07-26 23:15:46 +00:00
|
|
|
/* RTSP routines */
|
2004-03-16 21:30:41 +00:00
|
|
|
void
|
2004-07-05 11:10:57 +00:00
|
|
|
AliasHandleRtspOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk,
|
2004-03-16 21:30:41 +00:00
|
|
|
int _maxpacketsize);
|
2000-07-26 23:15:46 +00:00
|
|
|
|
2000-06-20 11:41:48 +00:00
|
|
|
/* PPTP routines */
|
2004-07-05 11:10:57 +00:00
|
|
|
void AliasHandlePptpOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk);
|
|
|
|
void AliasHandlePptpIn(struct libalias *la, struct ip *_pip, struct alias_link *_lnk);
|
2004-03-16 21:30:41 +00:00
|
|
|
int AliasHandlePptpGreOut(struct libalias *la, struct ip *_pip);
|
|
|
|
int AliasHandlePptpGreIn(struct libalias *la, struct ip *_pip);
|
2000-06-20 11:41:48 +00:00
|
|
|
|
1999-02-27 02:16:01 +00:00
|
|
|
/* NetBIOS routines */
|
2004-03-16 21:30:41 +00:00
|
|
|
int
|
2004-07-05 11:10:57 +00:00
|
|
|
AliasHandleUdpNbt(struct libalias *la, struct ip *_pip, struct alias_link *_lnk,
|
2004-03-16 21:30:41 +00:00
|
|
|
struct in_addr *_alias_address, u_short _alias_port);
|
|
|
|
int
|
2004-07-05 11:10:57 +00:00
|
|
|
AliasHandleUdpNbtNS(struct libalias *la, struct ip *_pip, struct alias_link *_lnk,
|
2004-03-16 21:30:41 +00:00
|
|
|
struct in_addr *_alias_address, u_short * _alias_port,
|
|
|
|
struct in_addr *_original_address, u_short * _original_port);
|
1999-02-27 02:16:01 +00:00
|
|
|
|
|
|
|
/* CUSeeMe routines */
|
2004-07-05 11:10:57 +00:00
|
|
|
void AliasHandleCUSeeMeOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk);
|
2004-03-16 21:30:41 +00:00
|
|
|
void AliasHandleCUSeeMeIn(struct libalias *la, struct ip *_pip, struct in_addr _original_addr);
|
1998-05-24 03:03:10 +00:00
|
|
|
|
2003-09-23 07:41:55 +00:00
|
|
|
/* Skinny routines */
|
2004-07-05 11:10:57 +00:00
|
|
|
void AliasHandleSkinny(struct libalias *la, struct ip *_pip, struct alias_link *_lnk);
|
2003-09-23 07:41:55 +00:00
|
|
|
|
1999-02-27 02:16:01 +00:00
|
|
|
/* Transparent proxy routines */
|
2004-03-16 21:30:41 +00:00
|
|
|
int
|
|
|
|
ProxyCheck(struct libalias *la, struct ip *_pip, struct in_addr *_proxy_server_addr,
|
|
|
|
u_short * _proxy_server_port);
|
|
|
|
void
|
2004-07-05 11:10:57 +00:00
|
|
|
ProxyModify(struct libalias *la, struct alias_link *_lnk, struct ip *_pip,
|
2004-03-16 21:30:41 +00:00
|
|
|
int _maxpacketsize, int _proxy_type);
|
1997-08-03 18:20:03 +00:00
|
|
|
|
1998-01-09 21:13:35 +00:00
|
|
|
enum alias_tcp_state {
|
2001-03-25 12:05:10 +00:00
|
|
|
ALIAS_TCP_STATE_NOT_CONNECTED,
|
|
|
|
ALIAS_TCP_STATE_CONNECTED,
|
|
|
|
ALIAS_TCP_STATE_DISCONNECTED
|
1998-01-09 21:13:35 +00:00
|
|
|
};
|
2001-03-25 12:05:10 +00:00
|
|
|
|
2004-07-06 12:13:28 +00:00
|
|
|
#if defined(_NETINET_IP_H_)
|
|
|
|
static __inline void *
|
|
|
|
ip_next(struct ip *iphdr)
|
|
|
|
{
|
|
|
|
char *p = (char *)iphdr;
|
|
|
|
return (&p[iphdr->ip_hl * 4]);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#if defined(_NETINET_TCP_H_)
|
|
|
|
static __inline void *
|
|
|
|
tcp_next(struct tcphdr *tcphdr)
|
|
|
|
{
|
|
|
|
char *p = (char *)tcphdr;
|
|
|
|
return (&p[tcphdr->th_off * 4]);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#if defined(_NETINET_UDP_H_)
|
|
|
|
static __inline void *
|
|
|
|
udp_next(struct udphdr *udphdr)
|
|
|
|
{
|
|
|
|
return ((void *)(udphdr + 1));
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
1997-05-23 04:41:31 +00:00
|
|
|
/*lint -restore */
|
2001-03-25 12:05:10 +00:00
|
|
|
|
2004-03-16 21:30:41 +00:00
|
|
|
#endif /* !_ALIAS_LOCAL_H_ */
|