1 files changed, 98 insertions, 0 deletions
diff --git a/include/linux/netfilter/nf_conntrack_h323_asn1.h b/include/linux/netfilter/nf_conntrack_h323_asn1.h
new file mode 100644
index 00000000000..8dab5968fc7
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_h323_asn1.h
@@ -0,0 +1,98 @@
+/****************************************************************************
+ * 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