429e15dea7
Skinny is the protocol used by Cisco IP phones to talk to Cisco Call Managers. With this code, one can use a Cisco IP phone behind a FreeBSD NAT gateway. Currently, having the Call Manager behind the NAT gateway is not supported. More information on enabling Skinny support in libalias, natd, and ppp can be found in those applications' manpages. PR: 55843 Reviewed by: ru Approved by: ru MFC after: 30 days
234 lines
8.5 KiB
C
234 lines
8.5 KiB
C
/*-
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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_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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* Initial version: August, 1996 (cjm)
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*
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* <updated several times by original author and Eivind Eklund>
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*/
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#ifndef _ALIAS_LOCAL_H_
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#define _ALIAS_LOCAL_H_
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/* Macros */
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/*
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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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/* Globals */
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extern int packetAliasMode;
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extern unsigned int skinnyPort;
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/* Prototypes */
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/* General utilities */
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u_short IpChecksum(struct ip *_pip);
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u_short TcpChecksum(struct ip *_pip);
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void DifferentialChecksum(u_short *_cksum, u_short *_new, u_short *_old,
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int _n);
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/* Internal data access */
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struct alias_link *
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FindIcmpIn(struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _id_alias, int _create);
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struct alias_link *
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FindIcmpOut(struct in_addr _src_addr, struct in_addr _dst_addr,
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u_short _id, int _create);
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struct alias_link *
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FindFragmentIn1(struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _ip_id);
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struct alias_link *
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FindFragmentIn2(struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_short _ip_id);
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struct alias_link *
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AddFragmentPtrLink(struct in_addr _dst_addr, u_short _ip_id);
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struct alias_link *
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FindFragmentPtr(struct in_addr _dst_addr, u_short _ip_id);
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struct alias_link *
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FindProtoIn(struct in_addr _dst_addr, struct in_addr _alias_addr,
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u_char _proto);
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struct alias_link *
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FindProtoOut(struct in_addr _src_addr, struct in_addr _dst_addr,
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u_char _proto);
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struct alias_link *
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FindUdpTcpIn(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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struct alias_link *
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FindUdpTcpOut(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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struct alias_link *
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AddPptp(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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struct alias_link *
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FindPptpOutByCallId(struct in_addr _src_addr,
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struct in_addr _dst_addr, u_int16_t _src_call_id);
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struct alias_link *
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FindPptpInByCallId(struct in_addr _dst_addr,
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struct in_addr _alias_addr, u_int16_t _dst_call_id);
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struct alias_link *
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FindPptpOutByPeerCallId(struct in_addr _src_addr,
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struct in_addr _dst_addr, u_int16_t _dst_call_id);
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struct alias_link *
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FindPptpInByPeerCallId(struct in_addr _dst_addr,
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struct in_addr _alias_addr, u_int16_t _alias_call_id);
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struct alias_link *
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FindRtspOut(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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struct in_addr
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FindOriginalAddress(struct in_addr _alias_addr);
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struct in_addr
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FindAliasAddress(struct in_addr _original_addr);
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/* External data access/modification */
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int FindNewPortGroup(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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void GetFragmentAddr(struct alias_link *_link, struct in_addr *_src_addr);
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void SetFragmentAddr(struct alias_link *_link, struct in_addr _src_addr);
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void GetFragmentPtr(struct alias_link *_link, char **_fptr);
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void SetFragmentPtr(struct alias_link *_link, char *fptr);
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void SetStateIn(struct alias_link *_link, int _state);
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void SetStateOut(struct alias_link *_link, int _state);
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int GetStateIn(struct alias_link *_link);
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int GetStateOut(struct alias_link *_link);
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struct in_addr
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GetOriginalAddress(struct alias_link *_link);
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struct in_addr
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GetDestAddress(struct alias_link *_link);
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struct in_addr
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GetAliasAddress(struct alias_link *_link);
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struct in_addr
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GetDefaultAliasAddress(void);
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void SetDefaultAliasAddress(struct in_addr _alias_addr);
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u_short GetOriginalPort(struct alias_link *_link);
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u_short GetAliasPort(struct alias_link *_link);
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struct in_addr
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GetProxyAddress(struct alias_link *_link);
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void SetProxyAddress(struct alias_link *_link, struct in_addr _addr);
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u_short GetProxyPort(struct alias_link *_link);
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void SetProxyPort(struct alias_link *_link, u_short _port);
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void SetAckModified(struct alias_link *_link);
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int GetAckModified(struct alias_link *_link);
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int GetDeltaAckIn(struct ip *_pip, struct alias_link *_link);
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int GetDeltaSeqOut(struct ip *_pip, struct alias_link *_link);
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void AddSeq(struct ip *_pip, struct alias_link *_link, int _delta);
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void SetExpire(struct alias_link *_link, int _expire);
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void ClearCheckNewLink(void);
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void SetProtocolFlags(struct alias_link *_link, int _pflags);
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int GetProtocolFlags(struct alias_link *_link);
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void SetDestCallId(struct alias_link *_link, u_int16_t _cid);
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#ifndef NO_FW_PUNCH
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void PunchFWHole(struct alias_link *_link);
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#endif
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/* Housekeeping function */
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void HouseKeeping(void);
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/* Tcp specfic routines */
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/* lint -save -library Suppress flexelint warnings */
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/* FTP routines */
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void AliasHandleFtpOut(struct ip *_pip, struct alias_link *_link,
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int _maxpacketsize);
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/* IRC routines */
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void AliasHandleIrcOut(struct ip *_pip, struct alias_link *_link,
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int _maxsize);
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/* RTSP routines */
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void AliasHandleRtspOut(struct ip *_pip, struct alias_link *_link,
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int _maxpacketsize);
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/* PPTP routines */
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void AliasHandlePptpOut(struct ip *_pip, struct alias_link *_link);
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void AliasHandlePptpIn(struct ip *_pip, struct alias_link *_link);
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int AliasHandlePptpGreOut(struct ip *_pip);
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int AliasHandlePptpGreIn(struct ip *_pip);
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/* NetBIOS routines */
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int AliasHandleUdpNbt(struct ip *_pip, struct alias_link *_link,
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struct in_addr *_alias_address, u_short _alias_port);
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int AliasHandleUdpNbtNS(struct ip *_pip, struct alias_link *_link,
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struct in_addr *_alias_address, u_short *_alias_port,
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struct in_addr *_original_address, u_short *_original_port);
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/* CUSeeMe routines */
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void AliasHandleCUSeeMeOut(struct ip *_pip, struct alias_link *_link);
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void AliasHandleCUSeeMeIn(struct ip *_pip, struct in_addr _original_addr);
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/* Skinny routines */
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void AliasHandleSkinny(struct ip *_pip, struct alias_link *_link);
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/* Transparent proxy routines */
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int ProxyCheck(struct ip *_pip, struct in_addr *_proxy_server_addr,
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u_short *_proxy_server_port);
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void ProxyModify(struct alias_link *_link, struct ip *_pip,
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int _maxpacketsize, int _proxy_type);
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enum alias_tcp_state {
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ALIAS_TCP_STATE_NOT_CONNECTED,
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ALIAS_TCP_STATE_CONNECTED,
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ALIAS_TCP_STATE_DISCONNECTED
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};
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/*lint -restore */
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#endif /* !_ALIAS_LOCAL_H_ */
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