2006-03-21 00:41:17 -07:00
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/****************************************************************************
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2006-12-02 23:08:46 -07:00
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* ip_conntrack_h323_asn1.h - BER and PER decoding library for H.323
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* conntrack/NAT module.
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2006-03-21 00:41:17 -07:00
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*
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2006-05-04 00:19:59 -06:00
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* Copyright (c) 2006 by Jing Min Zhao <zhaojingmin@users.sourceforge.net>
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2006-03-21 00:41:17 -07:00
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*
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* This source code is licensed under General Public License version 2.
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*
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*
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* This library is based on H.225 version 4, H.235 version 2 and H.245
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* version 7. It is extremely optimized to decode only the absolutely
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* necessary objects in a signal for Linux kernel NAT module use, so don't
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* expect it to be a full ASN.1 library.
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*
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* Features:
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*
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* 1. Small. The total size of code plus data is less than 20 KB (IA32).
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* 2. Fast. Decoding Netmeeting's Setup signal 1 million times on a PIII 866
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* takes only 3.9 seconds.
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* 3. No memory allocation. It uses a static object. No need to initialize or
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* cleanup.
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* 4. Thread safe.
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* 5. Support embedded architectures that has no misaligned memory access
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* support.
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*
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* Limitations:
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*
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* 1. At most 30 faststart entries. Actually this is limited by ethernet's MTU.
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* If a Setup signal contains more than 30 faststart, the packet size will
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* very likely exceed the MTU size, then the TPKT will be fragmented. I
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* don't know how to handle this in a Netfilter module. Anybody can help?
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* Although I think 30 is enough for most of the cases.
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* 2. IPv4 addresses only.
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*
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****************************************************************************/
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2006-12-02 23:08:46 -07:00
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#ifndef _NF_CONNTRACK_HELPER_H323_ASN1_H_
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#define _NF_CONNTRACK_HELPER_H323_ASN1_H_
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2006-03-21 00:41:17 -07:00
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/*****************************************************************************
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* H.323 Types
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****************************************************************************/
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2012-10-02 11:01:25 -06:00
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#include <linux/netfilter/nf_conntrack_h323_types.h>
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2006-03-21 00:41:17 -07:00
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typedef struct {
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enum {
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Q931_NationalEscape = 0x00,
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Q931_Alerting = 0x01,
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Q931_CallProceeding = 0x02,
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Q931_Connect = 0x07,
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Q931_ConnectAck = 0x0F,
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Q931_Progress = 0x03,
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Q931_Setup = 0x05,
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Q931_SetupAck = 0x0D,
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Q931_Resume = 0x26,
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Q931_ResumeAck = 0x2E,
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Q931_ResumeReject = 0x22,
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Q931_Suspend = 0x25,
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Q931_SuspendAck = 0x2D,
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Q931_SuspendReject = 0x21,
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Q931_UserInformation = 0x20,
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Q931_Disconnect = 0x45,
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Q931_Release = 0x4D,
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Q931_ReleaseComplete = 0x5A,
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Q931_Restart = 0x46,
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Q931_RestartAck = 0x4E,
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Q931_Segment = 0x60,
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Q931_CongestionCtrl = 0x79,
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Q931_Information = 0x7B,
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Q931_Notify = 0x6E,
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Q931_Status = 0x7D,
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Q931_StatusEnquiry = 0x75,
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Q931_Facility = 0x62
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} MessageType;
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H323_UserInformation UUIE;
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} Q931;
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/*****************************************************************************
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* Decode Functions Return Codes
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****************************************************************************/
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#define H323_ERROR_NONE 0 /* Decoded successfully */
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#define H323_ERROR_STOP 1 /* Decoding stopped, not really an error */
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#define H323_ERROR_BOUND -1
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#define H323_ERROR_RANGE -2
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/*****************************************************************************
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* Decode Functions
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****************************************************************************/
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int DecodeRasMessage(unsigned char *buf, size_t sz, RasMessage * ras);
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int DecodeQ931(unsigned char *buf, size_t sz, Q931 * q931);
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int DecodeMultimediaSystemControlMessage(unsigned char *buf, size_t sz,
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MultimediaSystemControlMessage *
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mscm);
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#endif
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