SoftEtherVPN/src/Cedar/NativeStack.h

// SoftEther VPN Source Code
// Cedar Communication Module
// 
// SoftEther VPN Server, Client and Bridge are free software under GPLv2.
// 
// Copyright (c) Daiyuu Nobori, Ph.D..
// Copyright (c) SoftEther VPN Project, University of Tsukuba, Japan.
// Copyright (c) SoftEther Corporation.
// 
// All Rights Reserved.
// 
// http://www.softether.org/
// 
// Author: Daiyuu Nobori
// Comments: Tetsuo Sugiyama, Ph.D.
// 
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// version 2 as published by the Free Software Foundation.
// 
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// 
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// SOURCE CODE CONTRIBUTION
// ------------------------
// 
// Your contribution to SoftEther VPN Project is much appreciated.
// Please send patches to us through GitHub.
// Read the SoftEther VPN Patch Acceptance Policy in advance:
// http://www.softether.org/5-download/src/9.patch
// 
// 
// DEAR SECURITY EXPERTS
// ---------------------
// 
// If you find a bug or a security vulnerability please kindly inform us
// about the problem immediately so that we can fix the security problem
// to protect a lot of users around the world as soon as possible.
// 
// Our e-mail address for security reports is:
// softether-vpn-security [at] softether.org
// 
// Please note that the above e-mail address is not a technical support
// inquiry address. If you need technical assistance, please visit
// http://www.softether.org/ and ask your question on the users forum.
// 
// Thank you for your cooperation.
// 
// 
// NO MEMORY OR RESOURCE LEAKS
// ---------------------------
// 
// The memory-leaks and resource-leaks verification under the stress
// test has been passed before release this source code.


// NativeStack.h
// Header of NativeStack.c

#ifndef	NATIVESTACK_H
#define	NATIVESTACK_H

//// Constants
#define	NS_MAC_ADDRESS_BYTE_1		0xDA		// First byte of the MAC address

#define	NS_CHECK_IPTABLES_INTERVAL_INIT	(1 * 1000)

#define	NS_CHECK_IPTABLES_INTERVAL_MAX	(5 * 60 * 1000)

//// Type
struct NATIVE_STACK
{
	CEDAR *Cedar;
	IPC *Ipc;						// IPC object
	char DeviceName[MAX_SIZE];		// Ethernet device name
	THREAD *MainThread;				// Main thread
	bool Halt;						// Halting flag
	CANCEL *Cancel;					// Cancel
	UCHAR MacAddress[6];			// MAC address of the virtual host
	ETH *Eth;						// Eth device
	SOCK *Sock1;					// Sock1 (To be used in the bridge side)
	SOCK *Sock2;					// Sock2 (Used in the IPC side)
	DHCP_OPTION_LIST CurrentDhcpOptionList;	// Current DHCP options list
	IP DnsServerIP;					// IP address of the DNS server
	IP DnsServerIP2;				// IP address of the DNS server #2
	bool IsIpRawMode;
	IP MyIP_InCaseOfIpRawMode;		// My IP

	THREAD *IpTablesThread;
	EVENT *IpTablesHaltEvent;
	bool IpTablesHalt;
	bool IpTablesInitOk;
};

struct IPTABLES_ENTRY
{
	char Chain[64];
	UINT LineNumber;
	char ConditionAndArgs[MAX_SIZE];
	IP DummySrcIp, DummyDestIP;
	UINT DummyMark;
};

struct IPTABLES_STATE
{
	UCHAR SeedHash[SHA1_SIZE];
	LIST *EntryList;
	bool HasError;
};


//// Function prototype
NATIVE_STACK *NewNativeStack(CEDAR *cedar, char *device_name, char *mac_address_seed);
void FreeNativeStack(NATIVE_STACK *a);

void NsGenMacAddress(void *dest, char *mac_address_seed, char *device_name);
void NsMainThread(THREAD *thread, void *param);
void NsGenMacAddressSignatureForMachine(UCHAR *dst_last_2, UCHAR *src_mac_addr_4);
bool NsIsMacAddressOnLocalhost(UCHAR *mac);

bool NsStartIpTablesTracking(NATIVE_STACK *a);
void NsStopIpTablesTracking(NATIVE_STACK *a);
void NsIpTablesThread(THREAD *thread, void *param);

IPTABLES_STATE *GetCurrentIpTables();
void FreeIpTablesState(IPTABLES_STATE *s);
bool IsIpTablesSupported();
IPTABLES_ENTRY *SearchIpTables(IPTABLES_STATE *s, char *chain, IP *src_ip, IP *dest_ip, UINT mark);
UINT GetCurrentIpTableLineNumber(char *chain, IP *src_ip, IP *dest_ip, UINT mark);

IPTABLES_STATE *StartAddIpTablesEntryForNativeStack(void *seed, UINT seed_size);
void EndAddIpTablesEntryForNativeStack(IPTABLES_STATE *s);
bool MaintainAddIpTablesEntryForNativeStack(IPTABLES_STATE *s);

void GenerateDummyIpAndMark(void *hash_seed, IPTABLES_ENTRY *e, UINT id);
UINT GenerateDummyMark(PRAND *p);
void GenerateDummyIp(PRAND *p, IP *ip);

#endif	// NATIVESTACK_H