1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
// SoftEther VPN Source Code - Stable Edition Repository
// Cedar Communication Module
//
// SoftEther VPN Server, Client and Bridge are free software under the Apache License, Version 2.0.
//
// Copyright (c) Daiyuu Nobori.
// Copyright (c) SoftEther VPN Project, University of Tsukuba, Japan.
// Copyright (c) SoftEther Corporation.
// Copyright (c) all contributors on SoftEther VPN project in GitHub.
//
// All Rights Reserved.
//
// http://www.softether.org/
//
// This stable branch is officially managed by Daiyuu Nobori, the owner of SoftEther VPN Project.
// Pull requests should be sent to the Developer Edition Master Repository on https://github.com/SoftEtherVPN/SoftEtherVPN
//
// License: The Apache License, Version 2.0
// https://www.apache.org/licenses/LICENSE-2.0
//
// DISCLAIMER
// ==========
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
// THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN, UNDER
// JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY, MERGE, PUBLISH,
// DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS SOFTWARE, THAT ANY
// JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS SOFTWARE OR ITS CONTENTS,
// AGAINST US (SOFTETHER PROJECT, SOFTETHER CORPORATION, DAIYUU NOBORI OR OTHER
// SUPPLIERS), OR ANY JURIDICAL DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND
// OF USING, COPYING, MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING,
// AND/OR SELLING COPIES OF THIS SOFTWARE SHALL BE REGARDED AS BE CONSTRUED AND
// CONTROLLED BY JAPANESE LAWS, AND YOU MUST FURTHER CONSENT TO EXCLUSIVE
// JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO, JAPAN. YOU MUST WAIVE
// ALL DEFENSES OF LACK OF PERSONAL JURISDICTION AND FORUM NON CONVENIENS.
// PROCESS MAY BE SERVED ON EITHER PARTY IN THE MANNER AUTHORIZED BY APPLICABLE
// LAW OR COURT RULE.
//
// USE ONLY IN JAPAN. DO NOT USE THIS SOFTWARE IN ANOTHER COUNTRY UNLESS YOU HAVE
// A CONFIRMATION THAT THIS SOFTWARE DOES NOT VIOLATE ANY CRIMINAL LAWS OR CIVIL
// RIGHTS IN THAT PARTICULAR COUNTRY. USING THIS SOFTWARE IN OTHER COUNTRIES IS
// COMPLETELY AT YOUR OWN RISK. THE SOFTETHER VPN PROJECT HAS DEVELOPED AND
// DISTRIBUTED THIS SOFTWARE TO COMPLY ONLY WITH THE JAPANESE LAWS AND EXISTING
// CIVIL RIGHTS INCLUDING PATENTS WHICH ARE SUBJECTS APPLY IN JAPAN. OTHER
// COUNTRIES' LAWS OR CIVIL RIGHTS ARE NONE OF OUR CONCERNS NOR RESPONSIBILITIES.
// WE HAVE NEVER INVESTIGATED ANY CRIMINAL REGULATIONS, CIVIL LAWS OR
// INTELLECTUAL PROPERTY RIGHTS INCLUDING PATENTS IN ANY OF OTHER 200+ COUNTRIES
// AND TERRITORIES. BY NATURE, THERE ARE 200+ REGIONS IN THE WORLD, WITH
// DIFFERENT LAWS. IT IS IMPOSSIBLE TO VERIFY EVERY COUNTRIES' LAWS, REGULATIONS
// AND CIVIL RIGHTS TO MAKE THE SOFTWARE COMPLY WITH ALL COUNTRIES' LAWS BY THE
// PROJECT. EVEN IF YOU WILL BE SUED BY A PRIVATE ENTITY OR BE DAMAGED BY A
// PUBLIC SERVANT IN YOUR COUNTRY, THE DEVELOPERS OF THIS SOFTWARE WILL NEVER BE
// LIABLE TO RECOVER OR COMPENSATE SUCH DAMAGES, CRIMINAL OR CIVIL
// RESPONSIBILITIES. NOTE THAT THIS LINE IS NOT LICENSE RESTRICTION BUT JUST A
// STATEMENT FOR WARNING AND DISCLAIMER.
//
// READ AND UNDERSTAND THE 'WARNING.TXT' FILE BEFORE USING THIS SOFTWARE.
// SOME SOFTWARE PROGRAMS FROM THIRD PARTIES ARE INCLUDED ON THIS SOFTWARE WITH
// LICENSE CONDITIONS WHICH ARE DESCRIBED ON THE 'THIRD_PARTY.TXT' FILE.
//
//
// 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.
// UdpAccel.h
// Header of UdpAccel.c
#ifndef UDPACCEL_H
#define UDPACCEL_H
// Constants
#define UDP_ACCELERATION_COMMON_KEY_SIZE 20 // Common key size
#define UDP_ACCELERATION_PACKET_KEY_SIZE 20 // Key size for the packet
#define UDP_ACCELERATION_PACKET_IV_SIZE 20 // IV size for the packet
#define UDP_ACCELERATION_TMP_BUF_SIZE 2048 // Temporary buffer size
#define UDP_ACCELERATION_WINDOW_SIZE_MSEC (30 * 1000) // Receive window size (in milliseconds)
#define UDP_ACCELERATION_SUPPORTED_MAX_PAYLOAD_SIZE 1600 // Maximum supported payload size
#define UDP_ACCELERATION_MAX_PADDING_SIZE 32 // Maximum padding size
#define UDP_ACCELERATION_REQUIRE_CONTINUOUS (10 * 1000) // Not to use if stable communication is not continued at least for this time
// Time constant for Build 8534 or earlier
#define UDP_ACCELERATION_KEEPALIVE_INTERVAL_MIN (1 * 1000) // Keep Alive Interval (minimum)
#define UDP_ACCELERATION_KEEPALIVE_INTERVAL_MAX (3 * 1000) // Keep Alive Interval (maximum)
#define UDP_ACCELERATION_KEEPALIVE_TIMEOUT (9 * 1000) // Time to disconnect time by non-communication
// Time constant for Build 8535 or later
#define UDP_ACCELERATION_KEEPALIVE_INTERVAL_MIN_FAST (500) // Keep Alive Interval (minimum)
#define UDP_ACCELERATION_KEEPALIVE_INTERVAL_MAX_FAST (1000) // Keep Alive Interval (maximum)
#define UDP_ACCELERATION_KEEPALIVE_TIMEOUT_FAST (2100) // Time to disconnect time by non-communication
// Range of port numbers
#define UDP_SERVER_PORT_LOWER 40000 // Minimum port
#define UDP_SERVER_PORT_HIGHER 44999 // Maximum port
// NAT-T port signature to be embedded in the Keep Alive of the session
#define UDP_NAT_T_PORT_SIGNATURE_IN_KEEP_ALIVE "NATT_MY_PORT"
// UDP Acceleration Mode
struct UDP_ACCEL
{
CEDAR *Cedar; // Cedar
bool NoNatT; // Not to communicate with the NAT-T server (To communicate with the query server instead)
bool ClientMode; // Whether client mode
bool IsInCedarPortList; // Whether included in the port list of the Cedar
UINT64 Now; // Current time
UCHAR MyKey[UDP_ACCELERATION_COMMON_KEY_SIZE]; // Submit-direction common key
UCHAR YourKey[UDP_ACCELERATION_COMMON_KEY_SIZE]; // Receiving-direction common key
SOCK *UdpSock; // UDP socket
UINT MyPort; // My port number
UINT YourPort; // Port number of the other party
IP MyIp; // My IP address
IP YourIp; // IP address of the other party
IP YourIp2; // IP address of the other party (second)
bool IsIPv6; // Whether it's an IPv6
UCHAR TmpBuf[UDP_ACCELERATION_TMP_BUF_SIZE]; // Temporary buffer
UINT64 LastRecvYourTick; // Opponent's tick value of the last reception
UINT64 LastRecvMyTick; // My tick value of the last reception
QUEUE *RecvBlockQueue; // Reception block queue
bool UseHMac; // Flag to use the HMAC
bool PlainTextMode; // No encryption
UINT64 LastSetSrcIpAndPortTick; // Opponent's tick ??value at the time of storing the IP address and port number of the opponent at the end
UINT64 LastRecvTick; // Tick when data has received at the end
UINT64 NextSendKeepAlive; // Next time to send a KeepAlive packet
UCHAR NextIv[UDP_ACCELERATION_PACKET_IV_SIZE]; // IV to be used next
UINT MyCookie; // My cookie
UINT YourCookie; // Cookie of the other party
bool Inited; // Initialized flag
UINT Mss; // Optimal MSS
UINT MaxUdpPacketSize; // Get the maximum transmittable UDP size
LOCK *NatT_Lock; // Lock the IP address field of NAT-T server
IP NatT_IP; // IP address of the NAT-T server
THREAD *NatT_GetIpThread; // IP address acquisition thread of NAT-T server
bool NatT_Halt; // Halting flag of IP address acquisition thread of NAT-T server
EVENT *NatT_HaltEvent; // Halting event of IP address acquisition thread of NAT-T server
UINT64 NextPerformNatTTick; // Time to communicate with NAT-T server next time
UINT CommToNatT_NumFail; // Number of failures to communicate with NAT-T server
UINT MyPortByNatTServer; // Self port number which is received from the NAT-T server
bool MyPortByNatTServerChanged; // The self port number which is received from the NAT-T server changes
UINT YourPortByNatTServer; // Port number of the opponent that was found via the NAT-T server
bool YourPortByNatTServerChanged; // Port number of the opponent that was found via the NAT-T server has been changed
bool FatalError; // A fatal error occurred
bool NatT_IP_Changed; // IP address of the NAT-T server has changed
UINT64 NatT_TranId; // Transaction ID to be exchanged with the NAT-T server
bool IsReachedOnce; // It is true if it succeeds in mutual transmission and reception of packets at least once
UINT64 CreatedTick; // Object creation time
bool FastDetect; // Fast disconnection detection mode
UINT64 FirstStableReceiveTick; // Start time of current stable continued receivable period
bool UseSuperRelayQuery; // Use the super relay query
bool UseUdpIpQuery; // Use the self IP address query by UDP
IP UdpIpQueryHost; // Host for the self IP address query by UDP
UINT UdpIpQueryPort; // Port number for self IP address for query by UDP
UCHAR UdpIpQueryPacketData[16]; // Query packet data (final transmission)
UINT UdpIpQueryPacketSize; // Query packet data size (final transmission)
UCHAR UdpHostUniqueKey[SHA1_SIZE]; // Unique key for UDP self endpoint query
};
// Function prototype
UDP_ACCEL *NewUdpAccel(CEDAR *cedar, IP *ip, bool client_mode, bool random_port, bool no_nat_t);
void FreeUdpAccel(UDP_ACCEL *a);
bool UdpAccelInitClient(UDP_ACCEL *a, UCHAR *server_key, IP *server_ip, UINT server_port, UINT server_cookie, UINT client_cookie, IP *server_ip_2);
bool UdpAccelInitServer(UDP_ACCEL *a, UCHAR *client_key, IP *client_ip, UINT client_port, IP *client_ip_2);
void UdpAccelPoll(UDP_ACCEL *a);
void UdpAccelSetTick(UDP_ACCEL *a, UINT64 tick64);
BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip, UINT src_port);
void UdpAccelCalcKey(UCHAR *key, UCHAR *common_key, UCHAR *iv);
bool UdpAccelIsSendReady(UDP_ACCEL *a, bool check_keepalive);
void UdpAccelSend(UDP_ACCEL *a, UCHAR *data, UINT data_size, bool compressed, UINT max_size, bool high_priority);
void UdpAccelSendBlock(UDP_ACCEL *a, BLOCK *b);
UINT UdpAccelCalcMss(UDP_ACCEL *a);
void NatT_GetIpThread(THREAD *thread, void *param);
#endif // UDPACCEL_H
|