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128 lines
7.3 KiB
C
128 lines
7.3 KiB
C
// SoftEther VPN Source Code - Developer Edition Master Branch
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// Cedar Communication Module
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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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CIPHER *CipherEncrypt; // Encryption context
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CIPHER *CipherDecrypt; // Decryption context
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UCHAR MyKey[UDP_ACCELERATION_COMMON_KEY_SIZE_V1]; // Send-direction common key
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UCHAR YourKey[UDP_ACCELERATION_COMMON_KEY_SIZE_V1]; // Receive-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]; // Send-direction common key (version 2)
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UCHAR NextIv_V2[UDP_ACCELERATION_PACKET_IV_SIZE_V2]; // IV to be used next (version 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 UdpAccelCalcKeyV1(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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