[net-next-2.6.git] / include / linux / netfilter / nf_conntrack_h323_asn1.h

/****************************************************************************
 * ip_conntrack_h323_asn1.h - BER and PER decoding library for H.323
 * 			      conntrack/NAT module.
 *
 * Copyright (c) 2006 by Jing Min Zhao <zhaojingmin@users.sourceforge.net>
 *
 * This source code is licensed under General Public License version 2.
 *
 *
 * This library is based on H.225 version 4, H.235 version 2 and H.245
 * version 7. It is extremely optimized to decode only the absolutely
 * necessary objects in a signal for Linux kernel NAT module use, so don't
 * expect it to be a full ASN.1 library.
 *
 * Features:
 *
 * 1. Small. The total size of code plus data is less than 20 KB (IA32).
 * 2. Fast. Decoding Netmeeting's Setup signal 1 million times on a PIII 866
 *    takes only 3.9 seconds.
 * 3. No memory allocation. It uses a static object. No need to initialize or
 *    cleanup.
 * 4. Thread safe.
 * 5. Support embedded architectures that has no misaligned memory access
 *    support.
 *
 * Limitations:
 *
 * 1. At most 30 faststart entries. Actually this is limited by ethernet's MTU.
 *    If a Setup signal contains more than 30 faststart, the packet size will
 *    very likely exceed the MTU size, then the TPKT will be fragmented. I
 *    don't know how to handle this in a Netfilter module. Anybody can help?
 *    Although I think 30 is enough for most of the cases.
 * 2. IPv4 addresses only.
 *
 ****************************************************************************/

#ifndef _NF_CONNTRACK_HELPER_H323_ASN1_H_
#define _NF_CONNTRACK_HELPER_H323_ASN1_H_

/*****************************************************************************
 * H.323 Types
 ****************************************************************************/
#include "nf_conntrack_h323_types.h"

typedef struct {
	enum {
		Q931_NationalEscape = 0x00,
		Q931_Alerting = 0x01,
		Q931_CallProceeding = 0x02,
		Q931_Connect = 0x07,
		Q931_ConnectAck = 0x0F,
		Q931_Progress = 0x03,
		Q931_Setup = 0x05,
		Q931_SetupAck = 0x0D,
		Q931_Resume = 0x26,
		Q931_ResumeAck = 0x2E,
		Q931_ResumeReject = 0x22,
		Q931_Suspend = 0x25,
		Q931_SuspendAck = 0x2D,
		Q931_SuspendReject = 0x21,
		Q931_UserInformation = 0x20,
		Q931_Disconnect = 0x45,
		Q931_Release = 0x4D,
		Q931_ReleaseComplete = 0x5A,
		Q931_Restart = 0x46,
		Q931_RestartAck = 0x4E,
		Q931_Segment = 0x60,
		Q931_CongestionCtrl = 0x79,
		Q931_Information = 0x7B,
		Q931_Notify = 0x6E,
		Q931_Status = 0x7D,
		Q931_StatusEnquiry = 0x75,
		Q931_Facility = 0x62
	} MessageType;
	H323_UserInformation UUIE;
} Q931;

/*****************************************************************************
 * Decode Functions Return Codes
 ****************************************************************************/

#define H323_ERROR_NONE 0	/* Decoded successfully */
#define H323_ERROR_STOP 1	/* Decoding stopped, not really an error */
#define H323_ERROR_BOUND -1
#define H323_ERROR_RANGE -2


/*****************************************************************************
 * Decode Functions
 ****************************************************************************/

int DecodeRasMessage(unsigned char *buf, size_t sz, RasMessage * ras);
int DecodeQ931(unsigned char *buf, size_t sz, Q931 * q931);
int DecodeMultimediaSystemControlMessage(unsigned char *buf, size_t sz,
					 MultimediaSystemControlMessage *
					 mscm);

#endif
Commit	Line	Data
5e35941d	1	/****************************************************************************
f587de0e PM	2	* ip_conntrack_h323_asn1.h - BER and PER decoding library for H.323
f587de0e PM	3	* conntrack/NAT module.
5e35941d	4	*
7582e9d1	5	* Copyright (c) 2006 by Jing Min Zhao <zhaojingmin@users.sourceforge.net>
5e35941d JMZ	6	*
	7	* This source code is licensed under General Public License version 2.
	8	*
	9	*
	10	* This library is based on H.225 version 4, H.235 version 2 and H.245
	11	* version 7. It is extremely optimized to decode only the absolutely
	12	* necessary objects in a signal for Linux kernel NAT module use, so don't
	13	* expect it to be a full ASN.1 library.
	14	*
	15	* Features:
	16	*
	17	* 1. Small. The total size of code plus data is less than 20 KB (IA32).
	18	* 2. Fast. Decoding Netmeeting's Setup signal 1 million times on a PIII 866
	19	* takes only 3.9 seconds.
	20	* 3. No memory allocation. It uses a static object. No need to initialize or
	21	* cleanup.
	22	* 4. Thread safe.
	23	* 5. Support embedded architectures that has no misaligned memory access
	24	* support.
	25	*
	26	* Limitations:
	27	*
	28	* 1. At most 30 faststart entries. Actually this is limited by ethernet's MTU.
	29	* If a Setup signal contains more than 30 faststart, the packet size will
	30	* very likely exceed the MTU size, then the TPKT will be fragmented. I
	31	* don't know how to handle this in a Netfilter module. Anybody can help?
	32	* Although I think 30 is enough for most of the cases.
	33	* 2. IPv4 addresses only.
	34	*
	35	****************************************************************************/
	36
f587de0e PM	37	#ifndef _NF_CONNTRACK_HELPER_H323_ASN1_H_
f587de0e PM	38	#define _NF_CONNTRACK_HELPER_H323_ASN1_H_
5e35941d JMZ	39
	40	/*****************************************************************************
	41	* H.323 Types
	42	****************************************************************************/
f587de0e	43	#include "nf_conntrack_h323_types.h"
5e35941d JMZ	44
	45	typedef struct {
	46	enum {
	47	Q931_NationalEscape = 0x00,
	48	Q931_Alerting = 0x01,
	49	Q931_CallProceeding = 0x02,
	50	Q931_Connect = 0x07,
	51	Q931_ConnectAck = 0x0F,
	52	Q931_Progress = 0x03,
	53	Q931_Setup = 0x05,
	54	Q931_SetupAck = 0x0D,
	55	Q931_Resume = 0x26,
	56	Q931_ResumeAck = 0x2E,
	57	Q931_ResumeReject = 0x22,
	58	Q931_Suspend = 0x25,
	59	Q931_SuspendAck = 0x2D,
	60	Q931_SuspendReject = 0x21,
	61	Q931_UserInformation = 0x20,
	62	Q931_Disconnect = 0x45,
	63	Q931_Release = 0x4D,
	64	Q931_ReleaseComplete = 0x5A,
	65	Q931_Restart = 0x46,
	66	Q931_RestartAck = 0x4E,
	67	Q931_Segment = 0x60,
	68	Q931_CongestionCtrl = 0x79,
	69	Q931_Information = 0x7B,
	70	Q931_Notify = 0x6E,
	71	Q931_Status = 0x7D,
	72	Q931_StatusEnquiry = 0x75,
	73	Q931_Facility = 0x62
	74	} MessageType;
	75	H323_UserInformation UUIE;
	76	} Q931;
	77
	78	/*****************************************************************************
	79	* Decode Functions Return Codes
	80	****************************************************************************/
	81
	82	#define H323_ERROR_NONE 0 /* Decoded successfully */
	83	#define H323_ERROR_STOP 1 /* Decoding stopped, not really an error */
	84	#define H323_ERROR_BOUND -1
	85	#define H323_ERROR_RANGE -2
	86
	87
	88	/*****************************************************************************
	89	* Decode Functions
	90	****************************************************************************/
	91
	92	int DecodeRasMessage(unsigned char buf, size_t sz, RasMessage ras);
	93	int DecodeQ931(unsigned char buf, size_t sz, Q931 q931);
	94	int DecodeMultimediaSystemControlMessage(unsigned char *buf, size_t sz,
	95	MultimediaSystemControlMessage *
	96	mscm);
	97
	98	#endif