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223 lines
12 KiB
C
223 lines
12 KiB
C
// SoftEther VPN Source Code - Developer Edition Master Branch
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// Cedar Communication Module
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//
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// SoftEther VPN Server, Client and Bridge are free software under GPLv2.
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//
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// Copyright (c) Daiyuu Nobori.
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// Copyright (c) SoftEther VPN Project, University of Tsukuba, Japan.
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// Copyright (c) SoftEther Corporation.
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//
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// All Rights Reserved.
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//
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// http://www.softether.org/
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//
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// Author: Daiyuu Nobori, Ph.D.
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// Comments: Tetsuo Sugiyama, Ph.D.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// version 2 as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License version 2
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// THE LICENSE AGREEMENT IS ATTACHED ON THE SOURCE-CODE PACKAGE
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// AS "LICENSE.TXT" FILE. READ THE TEXT FILE IN ADVANCE TO USE THE SOFTWARE.
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//
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//
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// THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN,
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// UNDER JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY,
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// MERGE, PUBLISH, DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS
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// SOFTWARE, THAT ANY JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS
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// SOFTWARE OR ITS CONTENTS, AGAINST US (SOFTETHER PROJECT, SOFTETHER
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// CORPORATION, DAIYUU NOBORI OR OTHER SUPPLIERS), OR ANY JURIDICAL
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// DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND OF USING, COPYING,
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// MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING, AND/OR
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// SELLING COPIES OF THIS SOFTWARE SHALL BE REGARDED AS BE CONSTRUED AND
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// CONTROLLED BY JAPANESE LAWS, AND YOU MUST FURTHER CONSENT TO
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// EXCLUSIVE JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO,
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// JAPAN. YOU MUST WAIVE ALL DEFENSES OF LACK OF PERSONAL JURISDICTION
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// AND FORUM NON CONVENIENS. PROCESS MAY BE SERVED ON EITHER PARTY IN
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// THE MANNER AUTHORIZED BY APPLICABLE LAW OR COURT RULE.
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//
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// USE ONLY IN JAPAN. DO NOT USE THIS SOFTWARE IN ANOTHER COUNTRY UNLESS
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// YOU HAVE A CONFIRMATION THAT THIS SOFTWARE DOES NOT VIOLATE ANY
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// CRIMINAL LAWS OR CIVIL RIGHTS IN THAT PARTICULAR COUNTRY. USING THIS
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// SOFTWARE IN OTHER COUNTRIES IS COMPLETELY AT YOUR OWN RISK. THE
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// SOFTETHER VPN PROJECT HAS DEVELOPED AND DISTRIBUTED THIS SOFTWARE TO
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// COMPLY ONLY WITH THE JAPANESE LAWS AND EXISTING CIVIL RIGHTS INCLUDING
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// PATENTS WHICH ARE SUBJECTS APPLY IN JAPAN. OTHER COUNTRIES' LAWS OR
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// CIVIL RIGHTS ARE NONE OF OUR CONCERNS NOR RESPONSIBILITIES. WE HAVE
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// NEVER INVESTIGATED ANY CRIMINAL REGULATIONS, CIVIL LAWS OR
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// INTELLECTUAL PROPERTY RIGHTS INCLUDING PATENTS IN ANY OF OTHER 200+
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// COUNTRIES AND TERRITORIES. BY NATURE, THERE ARE 200+ REGIONS IN THE
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// WORLD, WITH DIFFERENT LAWS. IT IS IMPOSSIBLE TO VERIFY EVERY
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// COUNTRIES' LAWS, REGULATIONS AND CIVIL RIGHTS TO MAKE THE SOFTWARE
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// COMPLY WITH ALL COUNTRIES' LAWS BY THE PROJECT. EVEN IF YOU WILL BE
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// SUED BY A PRIVATE ENTITY OR BE DAMAGED BY A PUBLIC SERVANT IN YOUR
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// COUNTRY, THE DEVELOPERS OF THIS SOFTWARE WILL NEVER BE LIABLE TO
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// RECOVER OR COMPENSATE SUCH DAMAGES, CRIMINAL OR CIVIL
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// RESPONSIBILITIES. NOTE THAT THIS LINE IS NOT LICENSE RESTRICTION BUT
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// JUST A STATEMENT FOR WARNING AND DISCLAIMER.
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//
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//
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// SOURCE CODE CONTRIBUTION
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// ------------------------
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//
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// Your contribution to SoftEther VPN Project is much appreciated.
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// Please send patches to us through GitHub.
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// Read the SoftEther VPN Patch Acceptance Policy in advance:
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// http://www.softether.org/5-download/src/9.patch
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//
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//
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// DEAR SECURITY EXPERTS
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// ---------------------
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//
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// If you find a bug or a security vulnerability please kindly inform us
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// about the problem immediately so that we can fix the security problem
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// to protect a lot of users around the world as soon as possible.
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//
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// Our e-mail address for security reports is:
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// softether-vpn-security [at] softether.org
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//
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// Please note that the above e-mail address is not a technical support
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// inquiry address. If you need technical assistance, please visit
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// http://www.softether.org/ and ask your question on the users forum.
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//
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// Thank you for your cooperation.
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//
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//
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// NO MEMORY OR RESOURCE LEAKS
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// ---------------------------
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//
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// The memory-leaks and resource-leaks verification under the stress
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// test has been passed before release this source code.
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// UdpAccel.h
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// Header of UdpAccel.c
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#ifndef UDPACCEL_H
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#define UDPACCEL_H
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// Constants
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#define UDP_ACCELERATION_COMMON_KEY_SIZE 20 // Common key size
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#define UDP_ACCELERATION_PACKET_KEY_SIZE 20 // Key size for the packet
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#define UDP_ACCELERATION_PACKET_IV_SIZE 20 // IV size for the packet
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#define UDP_ACCELERATION_TMP_BUF_SIZE 2048 // Temporary buffer size
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#define UDP_ACCELERATION_WINDOW_SIZE_MSEC (30 * 1000) // Receive window size (in milliseconds)
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#define UDP_ACCELERATION_SUPPORTED_MAX_PAYLOAD_SIZE 1600 // Maximum supported payload size
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#define UDP_ACCELERATION_MAX_PADDING_SIZE 32 // Maximum padding size
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#define UDP_ACCELERATION_REQUIRE_CONTINUOUS (10 * 1000) // Not to use if stable communication is not continued at least for this time
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// Time constant for Build 8534 or earlier
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#define UDP_ACCELERATION_KEEPALIVE_INTERVAL_MIN (1 * 1000) // Keep Alive Interval (minimum)
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#define UDP_ACCELERATION_KEEPALIVE_INTERVAL_MAX (3 * 1000) // Keep Alive Interval (maximum)
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#define UDP_ACCELERATION_KEEPALIVE_TIMEOUT (9 * 1000) // Time to disconnect time by non-communication
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// Time constant for Build 8535 or later
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#define UDP_ACCELERATION_KEEPALIVE_INTERVAL_MIN_FAST (500) // Keep Alive Interval (minimum)
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#define UDP_ACCELERATION_KEEPALIVE_INTERVAL_MAX_FAST (1000) // Keep Alive Interval (maximum)
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#define UDP_ACCELERATION_KEEPALIVE_TIMEOUT_FAST (2100) // Time to disconnect time by non-communication
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// Range of port numbers
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#define UDP_SERVER_PORT_LOWER 40000 // Minimum port
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#define UDP_SERVER_PORT_HIGHER 44999 // Maximum port
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// NAT-T port signature to be embedded in the Keep Alive of the session
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#define UDP_NAT_T_PORT_SIGNATURE_IN_KEEP_ALIVE "NATT_MY_PORT"
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// UDP Acceleration Mode
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struct UDP_ACCEL
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{
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CEDAR *Cedar; // Cedar
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bool NoNatT; // Not to communicate with the NAT-T server (To communicate with the query server instead)
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bool ClientMode; // Whether client mode
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bool IsInCedarPortList; // Whether included in the port list of the Cedar
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UINT64 Now; // Current time
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UCHAR MyKey[UDP_ACCELERATION_COMMON_KEY_SIZE]; // Submit-direction common key
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UCHAR YourKey[UDP_ACCELERATION_COMMON_KEY_SIZE]; // Receiving-direction common key
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SOCK *UdpSock; // UDP socket
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UINT MyPort; // My port number
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UINT YourPort; // Port number of the other party
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IP MyIp; // My IP address
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IP YourIp; // IP address of the other party
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IP YourIp2; // IP address of the other party (second)
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bool IsIPv6; // Whether it's an IPv6
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UCHAR TmpBuf[UDP_ACCELERATION_TMP_BUF_SIZE]; // Temporary buffer
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UINT64 LastRecvYourTick; // Opponent's tick value of the last reception
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UINT64 LastRecvMyTick; // My tick value of the last reception
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QUEUE *RecvBlockQueue; // Reception block queue
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bool UseHMac; // Flag to use the HMAC
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bool PlainTextMode; // No encryption
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UINT64 LastSetSrcIpAndPortTick; // Opponent's tick ??value at the time of storing the IP address and port number of the opponent at the end
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UINT64 LastRecvTick; // Tick when data has received at the end
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UINT64 NextSendKeepAlive; // Next time to send a KeepAlive packet
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UCHAR NextIv[UDP_ACCELERATION_PACKET_IV_SIZE]; // IV to be used next
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UINT MyCookie; // My cookie
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UINT YourCookie; // Cookie of the other party
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bool Inited; // Initialized flag
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UINT Mss; // Optimal MSS
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UINT MaxUdpPacketSize; // Get the maximum transmittable UDP size
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LOCK *NatT_Lock; // Lock the IP address field of NAT-T server
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IP NatT_IP; // IP address of the NAT-T server
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THREAD *NatT_GetIpThread; // IP address acquisition thread of NAT-T server
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bool NatT_Halt; // Halting flag of IP address acquisition thread of NAT-T server
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EVENT *NatT_HaltEvent; // Halting event of IP address acquisition thread of NAT-T server
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UINT64 NextPerformNatTTick; // Time to communicate with NAT-T server next time
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UINT CommToNatT_NumFail; // Number of failures to communicate with NAT-T server
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UINT MyPortByNatTServer; // Self port number which is received from the NAT-T server
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bool MyPortByNatTServerChanged; // The self port number which is received from the NAT-T server changes
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UINT YourPortByNatTServer; // Port number of the opponent that was found via the NAT-T server
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bool YourPortByNatTServerChanged; // Port number of the opponent that was found via the NAT-T server has been changed
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bool FatalError; // A fatal error occurred
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bool NatT_IP_Changed; // IP address of the NAT-T server has changed
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UINT64 NatT_TranId; // Transaction ID to be exchanged with the NAT-T server
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bool IsReachedOnce; // It is true if it succeeds in mutual transmission and reception of packets at least once
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UINT64 CreatedTick; // Object creation time
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bool FastDetect; // Fast disconnection detection mode
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UINT64 FirstStableReceiveTick; // Start time of current stable continued receivable period
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bool UseSuperRelayQuery; // Use the super relay query
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bool UseUdpIpQuery; // Use the self IP address query by UDP
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IP UdpIpQueryHost; // Host for the self IP address query by UDP
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UINT UdpIpQueryPort; // Port number for self IP address for query by UDP
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UCHAR UdpIpQueryPacketData[16]; // Query packet data (final transmission)
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UINT UdpIpQueryPacketSize; // Query packet data size (final transmission)
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UCHAR UdpHostUniqueKey[SHA1_SIZE]; // Unique key for UDP self endpoint query
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};
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// Function prototype
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UDP_ACCEL *NewUdpAccel(CEDAR *cedar, IP *ip, bool client_mode, bool random_port, bool no_nat_t);
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void FreeUdpAccel(UDP_ACCEL *a);
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bool UdpAccelInitClient(UDP_ACCEL *a, UCHAR *server_key, IP *server_ip, UINT server_port, UINT server_cookie, UINT client_cookie, IP *server_ip_2);
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bool UdpAccelInitServer(UDP_ACCEL *a, UCHAR *client_key, IP *client_ip, UINT client_port, IP *client_ip_2);
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void UdpAccelPoll(UDP_ACCEL *a);
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void UdpAccelSetTick(UDP_ACCEL *a, UINT64 tick64);
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BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip, UINT src_port);
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void UdpAccelCalcKey(UCHAR *key, UCHAR *common_key, UCHAR *iv);
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bool UdpAccelIsSendReady(UDP_ACCEL *a, bool check_keepalive);
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void UdpAccelSend(UDP_ACCEL *a, UCHAR *data, UINT data_size, bool compressed, UINT max_size, bool high_priority);
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void UdpAccelSendBlock(UDP_ACCEL *a, BLOCK *b);
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UINT UdpAccelCalcMss(UDP_ACCEL *a);
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void NatT_GetIpThread(THREAD *thread, void *param);
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#endif // UDPACCEL_H
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