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Cedar: implement UDP acceleration version 2, powered by ChaCha20-Poly1305

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This commit is contained in:
Davide Beatrici 2019-11-22 01:06:27 +01:00
parent 82a81a3ce6
commit 2ea5c2a7b0
2 changed files with 264 additions and 208 deletions
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445
src/Cedar/UdpAccel.c
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@ -253,7 +253,7 @@ void UdpAccelSendBlock(UDP_ACCEL *a, BLOCK *b)
return;
}
UdpAccelSend(a, b->Buf, b->Size, b->Compressed, a->MaxUdpPacketSize, b->PriorityQoS);
UdpAccelSend(a, b->Buf, b->Size, b->Compressed ? 1 : 0, a->MaxUdpPacketSize, b->PriorityQoS);
}
// Calculate the best MSS
@ -285,7 +285,7 @@ UINT UdpAccelCalcMss(UDP_ACCEL *a)
if (a->PlainTextMode == false)
{
// IV
ret -= UDP_ACCELERATION_PACKET_IV_SIZE;
ret -= UDP_ACCELERATION_PACKET_IV_SIZE_V1;
}
// Cookie
@ -306,7 +306,7 @@ UINT UdpAccelCalcMss(UDP_ACCEL *a)
if (a->PlainTextMode == false)
{
// Verify
ret -= UDP_ACCELERATION_PACKET_IV_SIZE;
ret -= UDP_ACCELERATION_PACKET_IV_SIZE_V1;
}
// Ethernet header (communication packets)
@ -322,19 +322,13 @@ UINT UdpAccelCalcMss(UDP_ACCEL *a)
}
// Send
void UdpAccelSend(UDP_ACCEL *a, UCHAR *data, UINT data_size, bool compressed, UINT max_size, bool high_priority)
void UdpAccelSend(UDP_ACCEL *a, UCHAR *data, UINT data_size, UCHAR flag, UINT max_size, bool high_priority)
{
UCHAR tmp[UDP_ACCELERATION_TMP_BUF_SIZE];
UCHAR *buf;
UINT size;
UCHAR key[UDP_ACCELERATION_PACKET_KEY_SIZE];
UINT64 ui64;
USHORT us;
UCHAR c;
UINT current_size;
UINT ui32;
bool fatal_error = false;
UINT r;
UCHAR buffer[UDP_ACCELERATION_TMP_BUF_SIZE];
UCHAR *buf = buffer;
UINT size = 0;
UINT64 tmp;
UINT ret;
// Validate arguments
if (a == NULL || (data_size != 0 && data == NULL))
{
@ -345,171 +339,167 @@ void UdpAccelSend(UDP_ACCEL *a, UCHAR *data, UINT data_size, bool compressed, UI
max_size = INFINITE;
}
buf = tmp;
size = 0;
// IV
if (a->PlainTextMode == false)
{
// IV
Copy(buf, a->NextIv, UDP_ACCELERATION_PACKET_IV_SIZE);
buf += UDP_ACCELERATION_PACKET_IV_SIZE;
size += UDP_ACCELERATION_PACKET_IV_SIZE;
// Calculate the key
UdpAccelCalcKey(key, a->MyKey, a->NextIv);
if (false)
if (a->Version > 1)
{
char tmp1[256];
char tmp2[256];
char tmp3[256];
BinToStr(tmp1, sizeof(tmp1), a->MyKey, sizeof(a->MyKey));
BinToStr(tmp2, sizeof(tmp2), a->NextIv, UDP_ACCELERATION_PACKET_IV_SIZE);
BinToStr(tmp3, sizeof(tmp3), key, sizeof(key));
Debug("My Key : %s\n"
"IV : %s\n"
"Comm Key: %s\n",
tmp1, tmp2, tmp3);
Copy(buf, a->NextIv_V2, UDP_ACCELERATION_PACKET_IV_SIZE_V2);
buf += UDP_ACCELERATION_PACKET_IV_SIZE_V2;
size += UDP_ACCELERATION_PACKET_IV_SIZE_V2;
}
else
{
Copy(buf, a->NextIv, UDP_ACCELERATION_PACKET_IV_SIZE_V1);
buf += UDP_ACCELERATION_PACKET_IV_SIZE_V1;
size += UDP_ACCELERATION_PACKET_IV_SIZE_V1;
}
}
// Cookie
ui32 = Endian32(a->YourCookie);
Copy(buf, &ui32, sizeof(UINT));
tmp = Endian32(a->YourCookie);
Copy(buf, &tmp, sizeof(UINT));
buf += sizeof(UINT);
size += sizeof(UINT);
// My Tick
ui64 = Endian64(a->Now == 0 ? 1ULL : a->Now);
Copy(buf, &ui64, sizeof(UINT64));
// My tick
tmp = Endian64(a->Now == 0 ? 1ULL : a->Now);
Copy(buf, &tmp, sizeof(UINT64));
buf += sizeof(UINT64);
size += sizeof(UINT64);
// Your Tick
ui64 = Endian64(a->LastRecvYourTick);
Copy(buf, &ui64, sizeof(UINT64));
// Your tick
tmp = Endian64(a->LastRecvYourTick);
Copy(buf, &tmp, sizeof(UINT64));
buf += sizeof(UINT64);
size += sizeof(UINT64);
// Size
us = Endian16(data_size);
Copy(buf, &us, sizeof(USHORT));
tmp = Endian16(data_size);
Copy(buf, &tmp, sizeof(USHORT));
buf += sizeof(USHORT);
size += sizeof(USHORT);
// Compress Flag
c = (compressed ? 1 : 0);
Copy(buf, &c, sizeof(UCHAR));
// Flag
Copy(buf, &flag, sizeof(UCHAR));
buf += sizeof(UCHAR);
size += sizeof(UCHAR);
// Data
if (data_size >= 1)
{
Copy(buf, data, data_size);
buf += data_size;
size += data_size;
}
Copy(buf, data, data_size);
buf += data_size;
size += data_size;
if (a->PlainTextMode == false)
{
static UCHAR zero[UDP_ACCELERATION_PACKET_IV_SIZE] = {0};
CRYPT *c;
current_size = UDP_ACCELERATION_PACKET_IV_SIZE + sizeof(UINT) + sizeof(UINT64) * 2 +
sizeof(USHORT) + sizeof(UCHAR) + data_size + UDP_ACCELERATION_PACKET_IV_SIZE;
if (current_size < max_size)
// Add padding to make protocol identification harder to accomplish
const UINT current_total_size = size + (a->Version > 1 ? UDP_ACCELERATION_PACKET_MAC_SIZE_V2 : UDP_ACCELERATION_PACKET_IV_SIZE_V1);
if (current_total_size < max_size)
{
// Padding
UCHAR pad[UDP_ACCELERATION_MAX_PADDING_SIZE];
UINT pad_size = MIN(max_size - current_size, UDP_ACCELERATION_MAX_PADDING_SIZE);
UINT pad_size = MIN(max_size - current_total_size, UDP_ACCELERATION_MAX_PADDING_SIZE);
pad_size = rand() % pad_size;
Zero(pad, sizeof(pad));
Copy(buf, pad, pad_size);
buf += pad_size;
size += pad_size;
}
// Verify
Copy(buf, zero, UDP_ACCELERATION_PACKET_IV_SIZE);
buf += UDP_ACCELERATION_PACKET_IV_SIZE;
size += UDP_ACCELERATION_PACKET_IV_SIZE;
if (a->Version > 1)
{
const UINT inner_size = size - UDP_ACCELERATION_PACKET_IV_SIZE_V2;
UCHAR *inner = buffer + UDP_ACCELERATION_PACKET_IV_SIZE_V2;
// Encryption
c = NewCrypt(key, UDP_ACCELERATION_PACKET_KEY_SIZE);
Encrypt(c, tmp + UDP_ACCELERATION_PACKET_IV_SIZE, tmp + UDP_ACCELERATION_PACKET_IV_SIZE, size - UDP_ACCELERATION_PACKET_IV_SIZE);
FreeCrypt(c);
ret = CipherProcessAead(a->CipherEncrypt, a->NextIv_V2, inner + inner_size, UDP_ACCELERATION_PACKET_MAC_SIZE_V2, inner, inner, inner_size, NULL, 0);
if (ret == 0)
{
Debug("UdpAccelSend(): CipherProcessAead() failed!\n");
return;
}
// Next Iv
Copy(a->NextIv, buf - UDP_ACCELERATION_PACKET_IV_SIZE, UDP_ACCELERATION_PACKET_IV_SIZE);
Copy(a->NextIv_V2, inner, UDP_ACCELERATION_PACKET_IV_SIZE_V2);
// Tag (appended to the buffer by CipherProcessAead())
size += UDP_ACCELERATION_PACKET_MAC_SIZE_V2;
}
else
{
UCHAR *inner = buffer + UDP_ACCELERATION_PACKET_IV_SIZE_V1;
UCHAR key[UDP_ACCELERATION_PACKET_KEY_SIZE_V1];
const UINT inner_size = size; // We don't have to subtract because we add below
CRYPT *c;
// Simple integrity check system: we fill some bytes with zeroes.
// The remote host verifies whether all the zeroes are present.
Zero(buf, UDP_ACCELERATION_PACKET_IV_SIZE_V1);
buf += UDP_ACCELERATION_PACKET_IV_SIZE_V1;
size += UDP_ACCELERATION_PACKET_IV_SIZE_V1;
UdpAccelCalcKeyV1(key, a->MyKey, a->NextIv);
c = NewCrypt(key, UDP_ACCELERATION_PACKET_KEY_SIZE_V1);
Encrypt(c, inner, inner, inner_size);
FreeCrypt(c);
Copy(a->NextIv, buf - UDP_ACCELERATION_PACKET_IV_SIZE_V1, UDP_ACCELERATION_PACKET_IV_SIZE_V1);
}
}
// Send
SetSockHighPriority(a->UdpSock, high_priority);
r = SendTo(a->UdpSock, &a->YourIp, a->YourPort, tmp, size);
if (r == 0 && a->UdpSock->IgnoreSendErr == false)
{
fatal_error = true;
Debug("Error: SendTo: %r %u %u\n", &a->YourIp, a->YourPort, size);
WHERE;
}
if (data_size == 0)
{
if (UdpAccelIsSendReady(a, true) == false)
{
if ((a->YourPortByNatTServer != 0) && (a->YourPort != a->YourPortByNatTServer))
{
r = SendTo(a->UdpSock, &a->YourIp, a->YourPortByNatTServer, tmp, size);
if (r == 0 && a->UdpSock->IgnoreSendErr == false)
{
fatal_error = true;
WHERE;
}
}
}
}
if (data_size == 0)
{
if (IsZeroIP(&a->YourIp2) == false && CmpIpAddr(&a->YourIp, &a->YourIp2) != 0)
{
if (UdpAccelIsSendReady(a, true) == false)
{
// When the KeepAlive, if the opponent may be behind a NAT,
// send the packet to the IP address of outside of the NAT
r = SendTo(a->UdpSock, &a->YourIp2, a->YourPort, tmp, size);
if (r == 0 && a->UdpSock->IgnoreSendErr == false)
{
fatal_error = true;
WHERE;
}
if ((a->YourPortByNatTServer != 0) && (a->YourPort != a->YourPortByNatTServer))
{
r = SendTo(a->UdpSock, &a->YourIp2, a->YourPortByNatTServer, tmp, size);
if (r == 0 && a->UdpSock->IgnoreSendErr == false)
{
fatal_error = true;
WHERE;
}
}
}
}
}
if (fatal_error)
ret = SendTo(a->UdpSock, &a->YourIp, a->YourPort, buffer, size);
if (ret == 0 && a->UdpSock->IgnoreSendErr == false)
{
a->FatalError = true;
WHERE;
Debug("UdpAccelSend(): SendTo() failed! IP: %r, port: %u, size: %u\n", &a->YourIp, a->YourPort, size);
return;
}
//Debug("UDP Send: %u\n", size);
if (data_size > 0 || UdpAccelIsSendReady(a, true))
{
return;
}
if (a->YourPortByNatTServer != 0 && a->YourPortByNatTServer != a->YourPort)
{
ret = SendTo(a->UdpSock, &a->YourIp, a->YourPortByNatTServer, buffer, size);
if (ret == 0 && a->UdpSock->IgnoreSendErr == false)
{
a->FatalError = true;
Debug("UdpAccelSend(): SendTo() failed! IP: %r, port: %u, size: %u\n", &a->YourIp, a->YourPortByNatTServer, size);
return;
}
}
if (UdpAccelIsSendReady(a, true))
{
return;
}
if (IsZeroIP(&a->YourIp2) == false && CmpIpAddr(&a->YourIp, &a->YourIp2) != 0)
{
// We sent the packet, but the remote host didn't reply.
// It may be behind a NAT, let's try to send the packet to the alternative IP address.
ret = SendTo(a->UdpSock, &a->YourIp2, a->YourPort, buffer, size);
if (ret == 0 && a->UdpSock->IgnoreSendErr == false)
{
a->FatalError = true;
Debug("UdpAccelSend(): SendTo() failed! IP: %r, port: %u, size: %u\n", &a->YourIp2, a->YourPort, size);
return;
}
if (a->YourPortByNatTServer != 0 && a->YourPortByNatTServer != a->YourPort)
{
ret = SendTo(a->UdpSock, &a->YourIp2, a->YourPortByNatTServer, buffer, size);
if (ret == 0 && a->UdpSock->IgnoreSendErr == false)
{
a->FatalError = true;
Debug("UdpAccelSend(): SendTo() failed! IP: %r, port: %u, size: %u\n", &a->YourIp2, a->YourPortByNatTServer, size);
return;
}
}
}
}
// Determine whether transmission is possible
@ -570,15 +560,11 @@ bool UdpAccelIsSendReady(UDP_ACCEL *a, bool check_keepalive)
// Process the received packet
BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip, UINT src_port)
{
UCHAR key[UDP_ACCELERATION_PACKET_KEY_SIZE];
UCHAR *iv;
CRYPT *c;
UINT64 my_tick, your_tick;
UINT inner_size;
UCHAR *inner_data = NULL;
UINT pad_size;
UCHAR *verify;
bool compress_flag;
UCHAR raw_flag;
BLOCK *b = NULL;
UINT cookie;
// Validate arguments
@ -589,36 +575,54 @@ BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip
if (a->PlainTextMode == false)
{
// IV
if (size < UDP_ACCELERATION_PACKET_IV_SIZE)
UCHAR *iv = buf;
if (a->Version > 1)
{
return NULL;
UINT data_size;
if (size < UDP_ACCELERATION_PACKET_IV_SIZE_V2)
{
return NULL;
}
buf += UDP_ACCELERATION_PACKET_IV_SIZE_V2;
size -= UDP_ACCELERATION_PACKET_IV_SIZE_V2;
if (size < UDP_ACCELERATION_PACKET_MAC_SIZE_V2)
{
return NULL;
}
data_size = size - UDP_ACCELERATION_PACKET_MAC_SIZE_V2;
if (CipherProcessAead(a->CipherDecrypt, iv, buf + data_size, UDP_ACCELERATION_PACKET_MAC_SIZE_V2, buf, buf, data_size, NULL, 0) == 0)
{
Debug("UdpAccelProcessRecvPacket(): CipherProcessAead() failed!\n");
return NULL;
}
size -= UDP_ACCELERATION_PACKET_MAC_SIZE_V2;
}
iv = buf;
buf += UDP_ACCELERATION_PACKET_IV_SIZE;
size -= UDP_ACCELERATION_PACKET_IV_SIZE;
// Calculate the key
UdpAccelCalcKey(key, a->YourKey, iv);
if (false)
else
{
char tmp1[256];
char tmp2[256];
char tmp3[256];
BinToStr(tmp1, sizeof(tmp1), a->YourKey, sizeof(a->YourKey));
BinToStr(tmp2, sizeof(tmp2), iv, UDP_ACCELERATION_PACKET_IV_SIZE);
BinToStr(tmp3, sizeof(tmp3), key, sizeof(key));
Debug("Your Key: %s\n"
"IV : %s\n"
"Comm Key: %s\n",
tmp1, tmp2, tmp3);
}
UCHAR key[UDP_ACCELERATION_PACKET_KEY_SIZE_V1];
CRYPT *c;
// Decryption
c = NewCrypt(key, UDP_ACCELERATION_PACKET_KEY_SIZE);
Encrypt(c, buf, buf, size);
FreeCrypt(c);
if (size < UDP_ACCELERATION_PACKET_IV_SIZE_V1)
{
return NULL;
}
buf += UDP_ACCELERATION_PACKET_IV_SIZE_V1;
size -= UDP_ACCELERATION_PACKET_IV_SIZE_V1;
UdpAccelCalcKeyV1(key, a->YourKey, iv);
c = NewCrypt(key, UDP_ACCELERATION_PACKET_KEY_SIZE_V1);
Encrypt(c, buf, buf, size);
FreeCrypt(c);
}
}
// Cookie
@ -635,7 +639,7 @@ BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip
return NULL;
}
// My Tick
// My tick
if (size < sizeof(UINT64))
{
return NULL;
@ -644,7 +648,7 @@ BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip
buf += sizeof(UINT64);
size -= sizeof(UINT64);
// Your Tick
// Your tick
if (size < sizeof(UINT64))
{
return NULL;
@ -653,7 +657,7 @@ BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip
buf += sizeof(UINT64);
size -= sizeof(UINT64);
// inner_size
// Inner data size
if (size < sizeof(USHORT))
{
return NULL;
@ -662,12 +666,20 @@ BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip
buf += sizeof(USHORT);
size -= sizeof(USHORT);
// compress_flag
// Flag
if (size < sizeof(UCHAR))
{
return NULL;
}
compress_flag = *((UCHAR *)buf);
if (a->ReadRawFlagMode == false)
{
compress_flag = *((UCHAR *)buf);
}
else
{
raw_flag = *((UCHAR *)buf);
}
buf += sizeof(UCHAR);
size -= sizeof(UCHAR);
@ -676,7 +688,7 @@ BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip
return NULL;
}
// inner_data
// Inner_data
if (inner_size >= 1)
{
inner_data = buf;
@ -686,26 +698,29 @@ BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip
if (a->PlainTextMode == false)
{
// padding
if (size < UDP_ACCELERATION_PACKET_IV_SIZE)
// Verify packet integrity
if (a->Version == 1)
{
return false;
}
pad_size = size - UDP_ACCELERATION_PACKET_IV_SIZE;
buf += pad_size;
size -= pad_size;
UINT pad_size;
// verify
if (size != UDP_ACCELERATION_PACKET_IV_SIZE)
{
return NULL;
}
if (size < UDP_ACCELERATION_PACKET_IV_SIZE_V1)
{
return false;
}
verify = buf;
pad_size = size - UDP_ACCELERATION_PACKET_IV_SIZE_V1;
buf += pad_size;
size -= pad_size;
if (IsZero(verify, UDP_ACCELERATION_PACKET_IV_SIZE) == false)
{
return NULL;
if (size != UDP_ACCELERATION_PACKET_IV_SIZE_V1)
{
return NULL;
}
if (IsZero(buf, UDP_ACCELERATION_PACKET_IV_SIZE_V1) == false)
{
return NULL;
}
}
}
@ -722,7 +737,11 @@ BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip
if (inner_size >= 1)
{
b = NewBlock(Clone(inner_data, inner_size), inner_size, compress_flag ? -1 : 0);
b = NewBlock(Clone(inner_data, inner_size), inner_size, a->ReadRawFlagMode == false ? (compress_flag ? -1 : 0) : 0);
if (a->ReadRawFlagMode)
{
b->RawFlagRetUdpAccel = raw_flag;
}
}
if (a->LastSetSrcIpAndPortTick < a->LastRecvYourTick)
@ -751,18 +770,18 @@ BLOCK *UdpAccelProcessRecvPacket(UDP_ACCEL *a, UCHAR *buf, UINT size, IP *src_ip
return b;
}
// Calculate the key
void UdpAccelCalcKey(UCHAR *key, UCHAR *common_key, UCHAR *iv)
// Calculate V1 key
void UdpAccelCalcKeyV1(UCHAR *key, UCHAR *common_key, UCHAR *iv)
{
UCHAR tmp[UDP_ACCELERATION_COMMON_KEY_SIZE + UDP_ACCELERATION_PACKET_IV_SIZE];
UCHAR tmp[UDP_ACCELERATION_COMMON_KEY_SIZE_V1 + UDP_ACCELERATION_PACKET_IV_SIZE_V1];
// Validate arguments
if (key == NULL || common_key == NULL || iv == NULL)
{
return;
}
Copy(tmp, common_key, UDP_ACCELERATION_COMMON_KEY_SIZE);
Copy(tmp + UDP_ACCELERATION_COMMON_KEY_SIZE, iv, UDP_ACCELERATION_PACKET_IV_SIZE);
Copy(tmp, common_key, UDP_ACCELERATION_COMMON_KEY_SIZE_V1);
Copy(tmp + UDP_ACCELERATION_COMMON_KEY_SIZE_V1, iv, UDP_ACCELERATION_PACKET_IV_SIZE_V1);
Sha1(key, tmp, sizeof(tmp));
}
@ -790,15 +809,25 @@ bool UdpAccelInitServer(UDP_ACCEL *a, UCHAR *client_key, IP *client_ip, UINT cli
}
IPToStr(tmp, sizeof(tmp), client_ip);
Debug("UdpAccelInitServer: client_ip=%s, client_port=%u, server_cookie=%u, client_cookie=%u\n", tmp, client_port,
a->MyCookie, a->YourCookie);
Debug("UdpAccelInitServer(): version: %u, client IP: %s, client port: %u, server cookie: %u, client cookie: %u\n", a->Version, tmp, client_port, a->MyCookie, a->YourCookie);
if (IsIP6(client_ip) != a->IsIPv6)
{
return false;
}
Copy(a->YourKey, client_key, UDP_ACCELERATION_COMMON_KEY_SIZE);
if (a->Version > 1)
{
a->CipherEncrypt = NewCipher("ChaCha20-Poly1305");
a->CipherDecrypt = NewCipher("ChaCha20-Poly1305");
SetCipherKey(a->CipherEncrypt, a->MyKey_V2, true);
SetCipherKey(a->CipherDecrypt, client_key, false);
}
else
{
Copy(a->YourKey, client_key, sizeof(a->YourKey));
}
Copy(&a->YourIp, client_ip, sizeof(IP));
Copy(&a->YourIp2, client_ip_2, sizeof(IP));
@ -822,14 +851,25 @@ bool UdpAccelInitClient(UDP_ACCEL *a, UCHAR *server_key, IP *server_ip, UINT ser
}
IPToStr(tmp, sizeof(tmp), server_ip);
Debug("UdpAccelInitClient: server_ip=%s, server_port=%u, server_cookie=%u, client_cookie=%u\n", tmp, server_port, server_cookie, client_cookie);
Debug("UdpAccelInitClient(): version: %u, client IP: %s, client port: %u, server cookie: %u, client cookie: %u\n", a->Version, tmp, server_port, server_cookie, client_cookie);
if (IsIP6(server_ip) != a->IsIPv6)
{
return false;
}
Copy(a->YourKey, server_key, UDP_ACCELERATION_COMMON_KEY_SIZE);
if (a->Version > 1)
{
a->CipherEncrypt = NewCipher("ChaCha20-Poly1305");
a->CipherDecrypt = NewCipher("ChaCha20-Poly1305");
SetCipherKey(a->CipherEncrypt, a->MyKey_V2, true);
SetCipherKey(a->CipherDecrypt, server_key, false);
}
else
{
Copy(a->YourKey, server_key, sizeof(a->YourKey));
}
Copy(&a->YourIp, server_ip, sizeof(IP));
Copy(&a->YourIp2, server_ip_2, sizeof(IP));
@ -911,6 +951,7 @@ UDP_ACCEL *NewUdpAccel(CEDAR *cedar, IP *ip, bool client_mode, bool random_port,
a->NoNatT = no_nat_t;
a->Version = 1;
a->NatT_TranId = Rand64();
@ -922,8 +963,9 @@ UDP_ACCEL *NewUdpAccel(CEDAR *cedar, IP *ip, bool client_mode, bool random_port,
a->Now = Tick64();
a->UdpSock = s;
Rand(a->MyKey, sizeof(a->MyKey));
Rand(a->YourKey, sizeof(a->YourKey));
Rand(a->MyKey_V2, sizeof(a->MyKey_V2));
Copy(&a->MyIp, ip, sizeof(IP));
a->MyPort = s->LocalPort;
@ -938,6 +980,7 @@ UDP_ACCEL *NewUdpAccel(CEDAR *cedar, IP *ip, bool client_mode, bool random_port,
a->RecvBlockQueue = NewQueue();
Rand(a->NextIv, sizeof(a->NextIv));
Rand(a->NextIv_V2, sizeof(a->NextIv_V2));
do
{
@ -1091,6 +1134,8 @@ void FreeUdpAccel(UDP_ACCEL *a)
ReleaseCedar(a->Cedar);
FreeCipher(a->CipherEncrypt);
FreeCipher(a->CipherDecrypt);
Free(a);
}

27
src/Cedar/UdpAccel.h
View File

@ -9,9 +9,14 @@
#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_COMMON_KEY_SIZE_V1 20 // V1: Common key size
#define UDP_ACCELERATION_PACKET_KEY_SIZE_V1 20 // V1: Key size for the packet
#define UDP_ACCELERATION_PACKET_IV_SIZE_V1 20 // V1: IV size for the packet
#define UDP_ACCELERATION_COMMON_KEY_SIZE_V2 128 // V2: Common key size
#define UDP_ACCELERATION_PACKET_IV_SIZE_V2 12 // V2: IV size for the packet
#define UDP_ACCELERATION_PACKET_MAC_SIZE_V2 16 // V2: MAC 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)
@ -45,8 +50,10 @@ struct UDP_ACCEL
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
CIPHER *CipherEncrypt; // Encryption context
CIPHER *CipherDecrypt; // Decryption context
UCHAR MyKey[UDP_ACCELERATION_COMMON_KEY_SIZE_V1]; // Send-direction common key
UCHAR YourKey[UDP_ACCELERATION_COMMON_KEY_SIZE_V1]; // Receive-direction common key
SOCK *UdpSock; // UDP socket
UINT MyPort; // My port number
UINT YourPort; // Port number of the other party
@ -63,7 +70,7 @@ struct UDP_ACCEL
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
UCHAR NextIv[UDP_ACCELERATION_PACKET_IV_SIZE_V1]; // IV to be used next
UINT MyCookie; // My cookie
UINT YourCookie; // Cookie of the other party
bool Inited; // Initialized flag
@ -94,6 +101,10 @@ struct UDP_ACCEL
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
UINT Version; // Version
UCHAR MyKey_V2[UDP_ACCELERATION_COMMON_KEY_SIZE_V2]; // Send-direction common key (version 2)
UCHAR NextIv_V2[UDP_ACCELERATION_PACKET_IV_SIZE_V2]; // IV to be used next (version 2)
bool ReadRawFlagMode; // Read raw flag mode
};
// Function prototype
@ -104,9 +115,9 @@ bool UdpAccelInitServer(UDP_ACCEL *a, UCHAR *client_key, IP *client_ip, UINT cli
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);
void UdpAccelCalcKeyV1(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 UdpAccelSend(UDP_ACCEL *a, UCHAR *data, UINT data_size, UCHAR flag, 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);