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224 lines
12 KiB
C
224 lines
12 KiB
C
// SoftEther VPN Source Code - Stable Edition Repository
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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 the Apache License, Version 2.0.
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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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// Copyright (c) all contributors on SoftEther VPN project in GitHub.
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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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// This stable branch is officially managed by Daiyuu Nobori, the owner of SoftEther VPN Project.
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// Pull requests should be sent to the Developer Edition Master Repository on https://github.com/SoftEtherVPN/SoftEtherVPN
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//
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// License: The Apache License, Version 2.0
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// DISCLAIMER
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// ==========
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN, UNDER
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// JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY, MERGE, PUBLISH,
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// DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS SOFTWARE, THAT ANY
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// JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS SOFTWARE OR ITS CONTENTS,
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// AGAINST US (SOFTETHER PROJECT, SOFTETHER CORPORATION, DAIYUU NOBORI OR OTHER
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// SUPPLIERS), OR ANY JURIDICAL DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND
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// OF USING, COPYING, MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING,
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// AND/OR 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 EXCLUSIVE
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// JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO, JAPAN. YOU MUST WAIVE
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// ALL DEFENSES OF LACK OF PERSONAL JURISDICTION AND FORUM NON CONVENIENS.
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// PROCESS MAY BE SERVED ON EITHER PARTY IN THE MANNER AUTHORIZED BY APPLICABLE
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// 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 YOU HAVE
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// A CONFIRMATION THAT THIS SOFTWARE DOES NOT VIOLATE ANY CRIMINAL LAWS OR CIVIL
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// RIGHTS IN THAT PARTICULAR COUNTRY. USING THIS SOFTWARE IN OTHER COUNTRIES IS
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// COMPLETELY AT YOUR OWN RISK. THE SOFTETHER VPN PROJECT HAS DEVELOPED AND
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// DISTRIBUTED THIS SOFTWARE TO COMPLY ONLY WITH THE JAPANESE LAWS AND EXISTING
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// CIVIL RIGHTS INCLUDING PATENTS WHICH ARE SUBJECTS APPLY IN JAPAN. OTHER
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// COUNTRIES' LAWS OR CIVIL RIGHTS ARE NONE OF OUR CONCERNS NOR RESPONSIBILITIES.
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// WE HAVE NEVER INVESTIGATED ANY CRIMINAL REGULATIONS, CIVIL LAWS OR
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// INTELLECTUAL PROPERTY RIGHTS INCLUDING PATENTS IN ANY OF OTHER 200+ COUNTRIES
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// AND TERRITORIES. BY NATURE, THERE ARE 200+ REGIONS IN THE WORLD, WITH
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// DIFFERENT LAWS. IT IS IMPOSSIBLE TO VERIFY EVERY COUNTRIES' LAWS, REGULATIONS
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// AND CIVIL RIGHTS TO MAKE THE SOFTWARE COMPLY WITH ALL COUNTRIES' LAWS BY THE
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// PROJECT. EVEN IF YOU WILL BE SUED BY A PRIVATE ENTITY OR BE DAMAGED BY A
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// PUBLIC SERVANT IN YOUR COUNTRY, THE DEVELOPERS OF THIS SOFTWARE WILL NEVER BE
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// LIABLE TO RECOVER OR COMPENSATE SUCH DAMAGES, CRIMINAL OR CIVIL
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// RESPONSIBILITIES. NOTE THAT THIS LINE IS NOT LICENSE RESTRICTION BUT JUST A
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// STATEMENT FOR WARNING AND DISCLAIMER.
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//
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// READ AND UNDERSTAND THE 'WARNING.TXT' FILE BEFORE USING THIS SOFTWARE.
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// SOME SOFTWARE PROGRAMS FROM THIRD PARTIES ARE INCLUDED ON THIS SOFTWARE WITH
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// LICENSE CONDITIONS WHICH ARE DESCRIBED ON THE 'THIRD_PARTY.TXT' FILE.
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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_V1 20 // V1: Common key size
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#define UDP_ACCELERATION_PACKET_KEY_SIZE_V1 20 // V1: Key size for the packet
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#define UDP_ACCELERATION_PACKET_IV_SIZE_V1 20 // V1: IV size for the packet
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#define UDP_ACCELERATION_COMMON_KEY_SIZE_V2 128 // V2: Common key size
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#define UDP_ACCELERATION_PACKET_IV_SIZE_V2 12 // V2: IV size for the packet
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#define UDP_ACCELERATION_PACKET_MAC_SIZE_V2 16 // V2: MAC 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_V1]; // Submit-direction common key
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UCHAR YourKey[UDP_ACCELERATION_COMMON_KEY_SIZE_V1]; // 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_V1]; // 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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UINT Version; // Version
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UCHAR MyKey_V2[UDP_ACCELERATION_COMMON_KEY_SIZE_V2]; // Submit-direction common key (Ver 2)
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UCHAR YourKey_V2[UDP_ACCELERATION_COMMON_KEY_SIZE_V2]; // Receiving-direction common key (Ver 2)
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UCHAR NextIv_V2[UDP_ACCELERATION_PACKET_IV_SIZE_V2]; // IV to be used next (Ver 2)
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bool ReadRawFlagMode; // Read raw flag mode
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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, UCHAR flag, 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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