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05ba4c8953
In 9fb9cbb108 ("[NETFILTER]: Add nf_conntrack subsystem.") the new
generic nf_conntrack was introduced, and it came to supersede the old
ip_conntrack.
This change updates (some) of the obsolete comments referring to old
file/function names of the ip_conntrack mechanism, as well as removes a
few self-referencing comments that we shouldn't maintain anymore.
I did not update any comments referring to historical actions (e.g,
comments like "this file was derived from ..." were left untouched, even
if the referenced file is no longer here).
Signed-off-by: Yonatan Goldschmidt <yon.goldschmidt@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/****************************************************************************
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* BER and PER decoding library for H.323 conntrack/NAT module.
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*
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* Copyright (c) 2006 by Jing Min Zhao <zhaojingmin@users.sourceforge.net>
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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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#ifndef _NF_CONNTRACK_HELPER_H323_ASN1_H_
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#define _NF_CONNTRACK_HELPER_H323_ASN1_H_
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/*****************************************************************************
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* H.323 Types
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****************************************************************************/
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#include <linux/netfilter/nf_conntrack_h323_types.h>
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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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