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1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
---|---|
2 | /**************************************************************************** |
3 | * BER and PER decoding library for H.323 conntrack/NAT module. |
4 | * |
5 | * Copyright (c) 2006 by Jing Min Zhao <zhaojingmin@users.sourceforge.net> |
6 | * |
7 | * This library is based on H.225 version 4, H.235 version 2 and H.245 |
8 | * version 7. It is extremely optimized to decode only the absolutely |
9 | * necessary objects in a signal for Linux kernel NAT module use, so don't |
10 | * expect it to be a full ASN.1 library. |
11 | * |
12 | * Features: |
13 | * |
14 | * 1. Small. The total size of code plus data is less than 20 KB (IA32). |
15 | * 2. Fast. Decoding Netmeeting's Setup signal 1 million times on a PIII 866 |
16 | * takes only 3.9 seconds. |
17 | * 3. No memory allocation. It uses a static object. No need to initialize or |
18 | * cleanup. |
19 | * 4. Thread safe. |
20 | * 5. Support embedded architectures that has no misaligned memory access |
21 | * support. |
22 | * |
23 | * Limitations: |
24 | * |
25 | * 1. At most 30 faststart entries. Actually this is limited by ethernet's MTU. |
26 | * If a Setup signal contains more than 30 faststart, the packet size will |
27 | * very likely exceed the MTU size, then the TPKT will be fragmented. I |
28 | * don't know how to handle this in a Netfilter module. Anybody can help? |
29 | * Although I think 30 is enough for most of the cases. |
30 | * 2. IPv4 addresses only. |
31 | * |
32 | ****************************************************************************/ |
33 | |
34 | #ifndef _NF_CONNTRACK_HELPER_H323_ASN1_H_ |
35 | #define _NF_CONNTRACK_HELPER_H323_ASN1_H_ |
36 | |
37 | /***************************************************************************** |
38 | * H.323 Types |
39 | ****************************************************************************/ |
40 | |
41 | #include <linux/types.h> |
42 | #include <linux/netfilter/nf_conntrack_h323_types.h> |
43 | |
44 | typedef struct { |
45 | enum { |
46 | Q931_NationalEscape = 0x00, |
47 | Q931_Alerting = 0x01, |
48 | Q931_CallProceeding = 0x02, |
49 | Q931_Connect = 0x07, |
50 | Q931_ConnectAck = 0x0F, |
51 | Q931_Progress = 0x03, |
52 | Q931_Setup = 0x05, |
53 | Q931_SetupAck = 0x0D, |
54 | Q931_Resume = 0x26, |
55 | Q931_ResumeAck = 0x2E, |
56 | Q931_ResumeReject = 0x22, |
57 | Q931_Suspend = 0x25, |
58 | Q931_SuspendAck = 0x2D, |
59 | Q931_SuspendReject = 0x21, |
60 | Q931_UserInformation = 0x20, |
61 | Q931_Disconnect = 0x45, |
62 | Q931_Release = 0x4D, |
63 | Q931_ReleaseComplete = 0x5A, |
64 | Q931_Restart = 0x46, |
65 | Q931_RestartAck = 0x4E, |
66 | Q931_Segment = 0x60, |
67 | Q931_CongestionCtrl = 0x79, |
68 | Q931_Information = 0x7B, |
69 | Q931_Notify = 0x6E, |
70 | Q931_Status = 0x7D, |
71 | Q931_StatusEnquiry = 0x75, |
72 | Q931_Facility = 0x62 |
73 | } MessageType; |
74 | H323_UserInformation UUIE; |
75 | } Q931; |
76 | |
77 | /***************************************************************************** |
78 | * Decode Functions Return Codes |
79 | ****************************************************************************/ |
80 | |
81 | #define H323_ERROR_NONE 0 /* Decoded successfully */ |
82 | #define H323_ERROR_STOP 1 /* Decoding stopped, not really an error */ |
83 | #define H323_ERROR_BOUND -1 |
84 | #define H323_ERROR_RANGE -2 |
85 | |
86 | |
87 | /***************************************************************************** |
88 | * Decode Functions |
89 | ****************************************************************************/ |
90 | |
91 | int DecodeRasMessage(unsigned char *buf, size_t sz, RasMessage * ras); |
92 | int DecodeQ931(unsigned char *buf, size_t sz, Q931 * q931); |
93 | int DecodeMultimediaSystemControlMessage(unsigned char *buf, size_t sz, |
94 | MultimediaSystemControlMessage * |
95 | mscm); |
96 | |
97 | #endif |
98 |
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