* Acess2 IP Stack
* - TCP Handling
*/
+#define DEBUG 1
#include "ipstack.h"
#include "ipv4.h"
#include "tcp.h"
-#define TCP_MIN_DYNPORT 0x1000
+#define TCP_MIN_DYNPORT 0xC000
#define TCP_MAX_HALFOPEN 1024 // Should be enough
+#define TCP_MAX_PACKET_SIZE 1024
+#define TCP_WINDOW_SIZE 0x2000
+#define TCP_RECIEVE_BUFFER_SIZE 0x4000
+
// === PROTOTYPES ===
void TCP_Initialise();
void TCP_StartConnection(tTCPConnection *Conn);
-void TCP_SendPacket( tTCPConnection *Conn, size_t Length, tTCPHeader *Data );
+void TCP_SendPacket(tTCPConnection *Conn, size_t Length, tTCPHeader *Data);
void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer);
-void TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header);
+void TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header, int Length);
+void TCP_INT_AppendRecieved(tTCPConnection *Connection, tTCPStoredPacket *Ptk);
+void TCP_INT_UpdateRecievedFromFuture(tTCPConnection *Connection);
Uint16 TCP_GetUnusedPort();
int TCP_AllocatePort(Uint16 Port);
int TCP_DeallocatePort(Uint16 Port);
// === CODE ===
/**
- * \fn void TCP_Initialise()
* \brief Initialise the TCP Layer
+ *
+ * Registers the client and server files and the GetPacket callback
*/
void TCP_Initialise()
{
IPv4_RegisterCallback(IP4PROT_TCP, TCP_GetPacket);
}
-/**
- * \brief Open a connection to another host using TCP
- */
-void TCP_StartConnection(tTCPConnection *Conn)
-{
- tTCPHeader hdr;
-
- hdr.SourcePort = Conn->LocalPort;
- hdr.DestPort = Conn->RemotePort;
- Conn->NextSequenceSend = rand();
- hdr.SequenceNumber = Conn->NextSequenceSend;
- hdr.DataOffset = (sizeof(tTCPHeader)+3)/4;
- hdr.Flags = TCP_FLAG_SYN;
- hdr.WindowSize = 0; // TODO
- hdr.Checksum = 0; // TODO
- hdr.UrgentPointer = 0;
- // SEND PACKET
- TCP_SendPacket( Conn, sizeof(tTCPHeader), &hdr );
- return ;
-}
-
/**
* \brief Sends a packet from the specified connection, calculating the checksums
* \param Conn Connection
* \param Length Length of data
- * \param Data Packet data
+ * \param Data Packet data (cast as a TCP Header)
*/
void TCP_SendPacket( tTCPConnection *Conn, size_t Length, tTCPHeader *Data )
{
switch( Conn->Interface->Type )
{
case 4: // Append IPv4 Pseudo Header
- buflen = 4 + 4 + 4 + ((Length+1)&1);
+ buflen = 4 + 4 + 4 + ((Length+1)&~1);
buf = malloc( buflen );
buf[0] = Conn->Interface->IP4.Address.L;
buf[1] = Conn->RemoteIP.v4.L;
memcpy( &buf[3], Data, Length );
Data->Checksum = IPv4_Checksum( buf, buflen );
free(buf);
- IPv4_SendPacket(Conn->Interface, Conn->RemoteIP.v4, IP4PROT_TCP, 0, buflen, buf);
+ IPv4_SendPacket(Conn->Interface, Conn->RemoteIP.v4, IP4PROT_TCP, 0, Length, Data);
break;
}
}
/**
- * \fn void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
* \brief Handles a packet from the IP Layer
+ * \param Interface Interface the packet arrived from
+ * \param Address Pointer to the addres structure
+ * \param Length Size of packet in bytes
+ * \param Buffer Packet data
*/
void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
{
tTCPListener *srv;
tTCPConnection *conn;
- Log("[TCP ] sizeof(tTCPHeader) = %i", sizeof(tTCPHeader));
- Log("[TCP ] DestPort = %i", ntohs(hdr->DestPort));
- Log("[TCP ] DestPort = %i", ntohs(hdr->DestPort));
- Log("[TCP ] SequenceNumber = %i", ntohl(hdr->SequenceNumber));
- Log("[TCP ] AcknowlegementNumber = %i", ntohl(hdr->AcknowlegementNumber));
- Log("[TCP ] DataOffset = %i", hdr->DataOffset >> 4);
- Log("[TCP ] Flags = {");
- Log("[TCP ] CWR = %B", !!(hdr->Flags & TCP_FLAG_CWR));
- Log("[TCP ] ECE = %B", !!(hdr->Flags & TCP_FLAG_ECE));
- Log("[TCP ] URG = %B", !!(hdr->Flags & TCP_FLAG_URG));
- Log("[TCP ] ACK = %B", !!(hdr->Flags & TCP_FLAG_ACK));
- Log("[TCP ] PSH = %B", !!(hdr->Flags & TCP_FLAG_PSH));
- Log("[TCP ] RST = %B", !!(hdr->Flags & TCP_FLAG_RST));
- Log("[TCP ] SYN = %B", !!(hdr->Flags & TCP_FLAG_SYN));
- Log("[TCP ] FIN = %B", !!(hdr->Flags & TCP_FLAG_FIN));
- Log("[TCP ] }");
- Log("[TCP ] WindowSize = %i", htons(hdr->WindowSize));
- Log("[TCP ] Checksum = 0x%x", htons(hdr->Checksum));
- Log("[TCP ] UrgentPointer = 0x%x", htons(hdr->UrgentPointer));
+ Log_Log("TCP", "SourcePort = %i, DestPort = %i",
+ ntohs(hdr->SourcePort), ntohs(hdr->DestPort));
+/*
+ Log_Log("TCP", "SequenceNumber = 0x%x", ntohl(hdr->SequenceNumber));
+ Log_Log("TCP", "AcknowlegementNumber = 0x%x", ntohl(hdr->AcknowlegementNumber));
+ Log_Log("TCP", "DataOffset = %i", hdr->DataOffset >> 4);
+ Log_Log("TCP", "Flags = {");
+ Log_Log("TCP", " CWR = %B, ECE = %B",
+ !!(hdr->Flags & TCP_FLAG_CWR), !!(hdr->Flags & TCP_FLAG_ECE));
+ Log_Log("TCP", " URG = %B, ACK = %B",
+ !!(hdr->Flags & TCP_FLAG_URG), !!(hdr->Flags & TCP_FLAG_ACK));
+ Log_Log("TCP", " PSH = %B, RST = %B",
+ !!(hdr->Flags & TCP_FLAG_PSH), !!(hdr->Flags & TCP_FLAG_RST));
+ Log_Log("TCP", " SYN = %B, FIN = %B",
+ !!(hdr->Flags & TCP_FLAG_SYN), !!(hdr->Flags & TCP_FLAG_FIN));
+ Log_Log("TCP", "}");
+ Log_Log("TCP", "WindowSize = %i", htons(hdr->WindowSize));
+ Log_Log("TCP", "Checksum = 0x%x", htons(hdr->Checksum));
+ Log_Log("TCP", "UrgentPointer = 0x%x", htons(hdr->UrgentPointer));
+*/
+
+ if( Length > (hdr->DataOffset >> 4)*4 )
+ {
+ Debug_HexDump(
+ "[TCP ] Packet Data = ",
+ (Uint8*)hdr + (hdr->DataOffset >> 4)*4,
+ Length - (hdr->DataOffset >> 4)*4
+ );
+ }
// Check Servers
{
// Check the interface
if(srv->Interface && srv->Interface != Interface) continue;
// Check the destination port
- if(srv->Port != hdr->DestPort) continue;
-
+ if(srv->Port != htons(hdr->DestPort)) continue;
+
+ Log_Log("TCP", "Matches server %p", srv);
// Is this in an established connection?
for( conn = srv->Connections; conn; conn = conn->Next )
{
+ Log_Log("TCP", "conn->Interface(%p) == Interface(%p)",
+ conn->Interface, Interface);
// Check that it is coming in on the same interface
if(conn->Interface != Interface) continue;
// Check Source Port
- if(conn->RemotePort != hdr->SourcePort) continue;
+ Log_Log("TCP", "conn->RemotePort(%i) == hdr->SourcePort(%i)",
+ conn->RemotePort, ntohs(hdr->SourcePort));
+ if(conn->RemotePort != ntohs(hdr->SourcePort)) continue;
// Check Source IP
if(conn->Interface->Type == 6 && !IP6_EQU(conn->RemoteIP.v6, *(tIPv6*)Address))
if(conn->Interface->Type == 4 && !IP4_EQU(conn->RemoteIP.v4, *(tIPv4*)Address))
continue;
+ Log_Log("TCP", "Matches connection %p", conn);
// We have a response!
- TCP_INT_HandleConnectionPacket(conn, hdr);
+ TCP_INT_HandleConnectionPacket(conn, hdr, Length);
return;
}
+ Log_Log("TCP", "Opening Connection");
// Open a new connection (well, check that it's a SYN)
- //TODO
-
- break;
+ if(hdr->Flags != TCP_FLAG_SYN) {
+ Log_Log("TCP", "Packet is not a SYN");
+ return ;
+ }
+
+ // TODO: Check for halfopen max
+
+ conn = calloc(1, sizeof(tTCPConnection));
+ conn->State = TCP_ST_HALFOPEN;
+ conn->LocalPort = srv->Port;
+ conn->RemotePort = ntohs(hdr->SourcePort);
+ conn->Interface = Interface;
+
+ switch(Interface->Type)
+ {
+ case 4: conn->RemoteIP.v4 = *(tIPv4*)Address; break;
+ case 6: conn->RemoteIP.v6 = *(tIPv6*)Address; break;
+ }
+
+ conn->RecievedBuffer = RingBuffer_Create( TCP_RECIEVE_BUFFER_SIZE );
+
+ conn->NextSequenceRcv = ntohl( hdr->SequenceNumber ) + 1;
+ conn->NextSequenceSend = rand();
+
+ // Create node
+ conn->Node.NumACLs = 1;
+ conn->Node.ACLs = &gVFS_ACL_EveryoneRW;
+ conn->Node.ImplPtr = conn;
+ conn->Node.ImplInt = srv->NextID ++;
+ conn->Node.Read = TCP_Client_Read;
+ conn->Node.Write = TCP_Client_Write;
+ //conn->Node.Close = TCP_SrvConn_Close;
+
+ // Hmm... Theoretically, this lock will never have to wait,
+ // as the interface is locked to the watching thread, and this
+ // runs in the watching thread. But, it's a good idea to have
+ // it, just in case
+ // Oh, wait, there is a case where a wildcard can be used
+ // (srv->Interface == NULL) so having the lock is a good idea
+ LOCK(&srv->lConnections);
+ if( !srv->Connections )
+ srv->Connections = conn;
+ else
+ srv->ConnectionsTail->Next = conn;
+ srv->ConnectionsTail = conn;
+ if(!srv->NewConnections)
+ srv->NewConnections = conn;
+ RELEASE(&srv->lConnections);
+
+ // Send the SYN ACK
+ hdr->Flags |= TCP_FLAG_ACK;
+ hdr->AcknowlegementNumber = htonl(conn->NextSequenceRcv);
+ hdr->SequenceNumber = htonl(conn->NextSequenceSend);
+ hdr->DestPort = hdr->SourcePort;
+ hdr->SourcePort = htons(srv->Port);
+ hdr->DataOffset = (sizeof(tTCPHeader)/4) << 4;
+ TCP_SendPacket( conn, sizeof(tTCPHeader), hdr );
+ conn->NextSequenceSend ++;
+ return ;
}
}
if(conn->Interface != Interface) continue;
// Check Source Port
- if(conn->RemotePort != hdr->SourcePort) continue;
+ if(conn->RemotePort != ntohs(hdr->SourcePort)) continue;
// Check Source IP
if(conn->Interface->Type == 6 && !IP6_EQU(conn->RemoteIP.v6, *(tIPv6*)Address))
if(conn->Interface->Type == 4 && !IP4_EQU(conn->RemoteIP.v4, *(tIPv4*)Address))
continue;
- TCP_INT_HandleConnectionPacket(conn, hdr);
+ TCP_INT_HandleConnectionPacket(conn, hdr, Length);
+ return ;
}
}
+
+ Log_Log("TCP", "No Match");
}
/**
* \brief Handles a packet sent to a specific connection
+ * \param Connection TCP Connection pointer
+ * \param Header TCP Packet pointer
+ * \param Length Length of the packet
*/
-void TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header)
+void TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header, int Length)
+{
+ tTCPStoredPacket *pkt;
+ int dataLen;
+
+ if(Header->Flags & TCP_FLAG_SYN) {
+ Connection->NextSequenceRcv = ntohl(Header->SequenceNumber) + 1;
+ }
+
+ if( Connection->State == TCP_ST_SYN_SENT )
+ {
+ if( (Header->Flags & (TCP_FLAG_SYN|TCP_FLAG_ACK)) == (TCP_FLAG_SYN|TCP_FLAG_ACK) ) {
+
+ Header->DestPort = Header->SourcePort;
+ Header->SourcePort = htons(Connection->LocalPort);
+ Header->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
+ Header->SequenceNumber = htonl(Connection->NextSequenceSend);
+ Header->WindowSize = htons(TCP_WINDOW_SIZE);
+ Header->Flags = TCP_FLAG_ACK;
+ Header->DataOffset = (sizeof(tTCPHeader)/4) << 4;
+ Log_Log("TCP", "ACKing SYN-ACK");
+ TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
+ Connection->State = TCP_ST_OPEN;
+ }
+ }
+
+ // Get length of data
+ dataLen = Length - (Header->DataOffset>>4)*4;
+ Log_Log("TCP", "HandleConnectionPacket - dataLen = %i", dataLen);
+
+ if(Header->Flags & TCP_FLAG_ACK) {
+ // TODO: Process an ACKed Packet
+ Log_Log("TCP", "Conn %p, Packet 0x%x ACKed", Connection, Header->AcknowlegementNumber);
+ }
+
+ // TODO: Check what to do here
+ if(Header->Flags & TCP_FLAG_FIN) {
+ if( Connection->State == TCP_ST_FIN_SENT ) {
+ Connection->State = TCP_ST_FINISHED;
+ return ;
+ }
+ else {
+ Connection->State = TCP_ST_FINISHED;
+ Header->DestPort = Header->SourcePort;
+ Header->SourcePort = htons(Connection->LocalPort);
+ Header->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
+ Header->SequenceNumber = htonl(Connection->NextSequenceSend);
+ Header->Flags = TCP_FLAG_ACK;
+ TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
+ return ;
+ }
+ }
+
+ if(dataLen == 0) {
+ Log_Log("TCP", "Empty Packet");
+ return ;
+ }
+
+ // NOTES:
+ // Flags
+ // PSH - Has Data?
+ // /NOTES
+
+ // Allocate and fill cached packet
+ pkt = malloc( dataLen + sizeof(tTCPStoredPacket) );
+ pkt->Next = NULL;
+ pkt->Sequence = ntohl(Header->SequenceNumber);
+ pkt->Length = dataLen;
+ memcpy(pkt->Data, (Uint8*)Header + (Header->DataOffset>>4)*4, dataLen);
+
+ // Is this packet the next expected packet?
+ // TODO: Fix this to check if the packet is in the window.
+ if( pkt->Sequence != Connection->NextSequenceRcv )
+ {
+ tTCPStoredPacket *tmp, *prev = NULL;
+
+ Log_Log("TCP", "Out of sequence packet (0x%08x != 0x%08x)",
+ pkt->Sequence, Connection->NextSequenceRcv);
+
+ // No? Well, let's cache it and look at it later
+ LOCK( &Connection->lFuturePackets );
+ for(tmp = Connection->FuturePackets;
+ tmp;
+ prev = tmp, tmp = tmp->Next)
+ {
+ if(tmp->Sequence > pkt->Sequence) break;
+ }
+ if(prev)
+ prev->Next = pkt;
+ else
+ Connection->FuturePackets = pkt;
+ pkt->Next = tmp;
+ RELEASE( &Connection->lFuturePackets );
+ }
+ else
+ {
+ // Ooh, Goodie! Add it to the recieved list
+ TCP_INT_AppendRecieved(Connection, pkt);
+ free(pkt);
+ Log_Log("TCP", "0x%08x += %i", Connection->NextSequenceRcv, dataLen);
+ Connection->NextSequenceRcv += dataLen;
+
+ // TODO: This should be moved out of the watcher thread,
+ // so that a single lost packet on one connection doesn't cause
+ // all connections on the interface to lag.
+ TCP_INT_UpdateRecievedFromFuture(Connection);
+
+ // ACK Packet
+ Header->DestPort = Header->SourcePort;
+ Header->SourcePort = htons(Connection->LocalPort);
+ Header->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
+ Header->SequenceNumber = htonl(Connection->NextSequenceSend);
+ Header->WindowSize = htons(TCP_WINDOW_SIZE);
+ Header->Flags &= TCP_FLAG_SYN; // Eliminate all flags save for SYN
+ Header->Flags |= TCP_FLAG_ACK; // Add ACK
+ Log_Log("TCP", "Sending ACK for 0x%08x", Connection->NextSequenceRcv);
+ TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
+ //Connection->NextSequenceSend ++;
+ }
+}
+
+/**
+ * \brief Appends a packet to the recieved list
+ * \param Connection Connection structure
+ * \param Pkt Packet structure on heap
+ */
+void TCP_INT_AppendRecieved(tTCPConnection *Connection, tTCPStoredPacket *Pkt)
{
+ LOCK( &Connection->lRecievedPackets );
+ if(Connection->RecievedBuffer->Length + Pkt->Length > Connection->RecievedBuffer->Space )
+ {
+ Log_Error("TCP", "Buffer filled, packet dropped (%s)",
+ // TCP_INT_DumpConnection(Connection)
+ ""
+ );
+ return ;
+ }
+
+ RingBuffer_Write( Connection->RecievedBuffer, Pkt->Data, Pkt->Length );
+
+ RELEASE( &Connection->lRecievedPackets );
+}
+/**
+ * \brief Updates the connections recieved list from the future list
+ * \param Connection Connection structure
+ *
+ * Updates the recieved packets list with packets from the future (out
+ * of order) packets list that are now able to be added in direct
+ * sequence.
+ */
+void TCP_INT_UpdateRecievedFromFuture(tTCPConnection *Connection)
+{
+ tTCPStoredPacket *pkt, *prev;
+ for(;;)
+ {
+ prev = NULL;
+ // Look for the next expected packet in the cache.
+ LOCK( &Connection->lFuturePackets );
+ for(pkt = Connection->FuturePackets;
+ pkt && pkt->Sequence < Connection->NextSequenceRcv;
+ prev = pkt, pkt = pkt->Next);
+
+ // If we can't find the expected next packet, stop looking
+ if(!pkt || pkt->Sequence > Connection->NextSequenceRcv) {
+ RELEASE( &Connection->lFuturePackets );
+ return;
+ }
+
+ // Delete packet from future list
+ if(prev)
+ prev->Next = pkt->Next;
+ else
+ Connection->FuturePackets = pkt->Next;
+
+ // Release list
+ RELEASE( &Connection->lFuturePackets );
+
+ // Looks like we found one
+ TCP_INT_AppendRecieved(Connection, pkt);
+ Connection->NextSequenceRcv += pkt->Length;
+ free(pkt);
+ }
}
/**
// --- Server
tVFS_Node *TCP_Server_Init(tInterface *Interface)
{
- tTCPListener *srv = malloc( sizeof(tTCPListener) );
+ tTCPListener *srv;
+
+ srv = malloc( sizeof(tTCPListener) );
+
+ if( srv == NULL ) {
+ Log_Warning("TCP", "malloc failed for listener (%i) bytes", sizeof(tTCPListener));
+ return NULL;
+ }
srv->Interface = Interface;
srv->Port = 0;
srv->NextID = 0;
srv->Connections = NULL;
+ srv->ConnectionsTail = NULL;
+ srv->NewConnections = NULL;
srv->Next = NULL;
+ srv->Node.Flags = VFS_FFLAG_DIRECTORY;
+ srv->Node.Size = -1;
srv->Node.ImplPtr = srv;
srv->Node.NumACLs = 1;
srv->Node.ACLs = &gVFS_ACL_EveryoneRW;
tTCPListener *srv = Node->ImplPtr;
tTCPConnection *conn;
char *ret;
+
+ ENTER("pNode iPos", Node, Pos);
- while( srv->NewConnections == NULL ) Threads_Yield();
+ Log_Log("TCP", "Thread %i waiting for a connection", Threads_GetTID());
+ for(;;)
+ {
+ LOCK( &srv->lConnections );
+ if( srv->NewConnections != NULL ) break;
+ RELEASE( &srv->lConnections );
+ Threads_Yield();
+ continue;
+ }
+
+ // Increment the new list (the current connection is still on the
+ // normal list)
conn = srv->NewConnections;
srv->NewConnections = conn->Next;
+
+ LOG("conn = %p", conn);
+ LOG("srv->Connections = %p", srv->Connections);
+ LOG("srv->NewConnections = %p", srv->NewConnections);
+ LOG("srv->ConnectionsTail = %p", srv->ConnectionsTail);
+
+ RELEASE( &srv->lConnections );
ret = malloc(9);
- itoa(ret, Node->ImplInt, 16, '0', 8);
+ itoa(ret, conn->Node.ImplInt, 16, 8, '0');
+ Log_Log("TCP", "Thread %i got '%s'", Threads_GetTID(), ret);
+ LEAVE('s', ret);
return ret;
}
*/
tVFS_Node *TCP_Server_FindDir(tVFS_Node *Node, char *Name)
{
- return NULL;
+ tTCPConnection *conn;
+ tTCPListener *srv = Node->ImplPtr;
+ char tmp[9];
+ int id = atoi(Name);
+
+ ENTER("pNode sName", Node, Name);
+
+ // Sanity Check
+ itoa(tmp, id, 16, 8, '0');
+ if(strcmp(tmp, Name) != 0) {
+ LOG("'%s' != '%s' (%08x)", Name, tmp, id);
+ LEAVE('n');
+ return NULL;
+ }
+
+ Log_Debug("TCP", "srv->Connections = %p", srv->Connections);
+ Log_Debug("TCP", "srv->NewConnections = %p", srv->NewConnections);
+ Log_Debug("TCP", "srv->ConnectionsTail = %p", srv->ConnectionsTail);
+
+ // Search
+ LOCK( &srv->lConnections );
+ for(conn = srv->Connections;
+ conn;
+ conn = conn->Next)
+ {
+ LOG("conn->Node.ImplInt = %i", conn->Node.ImplInt);
+ if(conn->Node.ImplInt == id) break;
+ }
+ RELEASE( &srv->lConnections );
+
+ // If not found, ret NULL
+ if(!conn) {
+ LOG("Connection %i not found", id);
+ LEAVE('n');
+ return NULL;
+ }
+
+ // Return node
+ LEAVE('p', &conn->Node);
+ return &conn->Node;
}
+/**
+ * \brief Handle IOCtl calls
+ */
int TCP_Server_IOCtl(tVFS_Node *Node, int ID, void *Data)
{
tTCPListener *srv = Node->ImplPtr;
srv->Port = TCP_GetUnusedPort();
else // Else, mark this as used
TCP_AllocatePort(srv->Port);
+
+ Log_Log("TCP", "Server %p listening on port %i", srv, srv->Port);
+
return srv->Port;
}
return 0;
}
// --- Client
+/**
+ * \brief Create a client node
+ */
tVFS_Node *TCP_Client_Init(tInterface *Interface)
{
tTCPConnection *conn = malloc( sizeof(tTCPConnection) );
conn->State = TCP_ST_CLOSED;
conn->Interface = Interface;
- conn->LocalPort = 0;
- conn->RemotePort = 0;
+ conn->LocalPort = -1;
+ conn->RemotePort = -1;
memset( &conn->RemoteIP, 0, sizeof(conn->RemoteIP) );
conn->Node.ImplPtr = conn;
conn->Node.IOCtl = TCP_Client_IOCtl;
conn->Node.Close = TCP_Client_Close;
+ conn->RecievedBuffer = RingBuffer_Create( TCP_RECIEVE_BUFFER_SIZE );
+
LOCK(&glTCP_OutbountCons);
conn->Next = gTCP_OutbountCons;
gTCP_OutbountCons = conn;
return &conn->Node;
}
+/**
+ * \brief Wait for a packet and return it
+ * \note If \a Length is smaller than the size of the packet, the rest
+ * of the packet's data will be discarded.
+ */
Uint64 TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
{
- return 0;
+ tTCPConnection *conn = Node->ImplPtr;
+ char *destbuf = Buffer;
+ size_t len;
+
+ ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
+ LOG("conn = %p", conn);
+ LOG("conn->State = %i", conn->State);
+
+ // Check if connection is open
+ while( conn->State == TCP_ST_HALFOPEN || conn->State == TCP_ST_SYN_SENT )
+ Threads_Yield();
+ if( conn->State != TCP_ST_OPEN ) {
+ LEAVE('i', 0);
+ return 0;
+ }
+
+ // Poll packets
+ for(;;)
+ {
+ // Lock list and check if there is a packet
+ LOCK( &conn->lRecievedPackets );
+ if( conn->RecievedBuffer->Length == 0 ) {
+ // If not, release the lock, yield and try again
+ RELEASE( &conn->lRecievedPackets );
+ Threads_Yield();
+ continue;
+ }
+
+ // Attempt to read all `Length` bytes
+ len = RingBuffer_Read( destbuf, conn->RecievedBuffer, Length );
+
+ // Release the lock (we don't need it any more)
+ RELEASE( &conn->lRecievedPackets );
+
+ LEAVE('i', len);
+ return len;
+ }
+}
+
+/**
+ * \brief Send a data packet on a connection
+ */
+void TCP_INT_SendDataPacket(tTCPConnection *Connection, size_t Length, void *Data)
+{
+ char buf[sizeof(tTCPHeader)+Length];
+ tTCPHeader *packet = (void*)buf;
+
+ packet->SourcePort = htons(Connection->LocalPort);
+ packet->DestPort = htons(Connection->RemotePort);
+ packet->DataOffset = (sizeof(tTCPHeader)/4)*16;
+ packet->WindowSize = TCP_WINDOW_SIZE;
+
+ packet->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
+ packet->SequenceNumber = htonl(Connection->NextSequenceSend);
+ packet->Flags = TCP_FLAG_PSH|TCP_FLAG_ACK; // Hey, ACK if you can!
+
+ memcpy(packet->Options, Data, Length);
+
+ TCP_SendPacket( Connection, sizeof(tTCPHeader)+Length, packet );
+
+ Connection->NextSequenceSend += Length;
}
+/**
+ * \brief Send some bytes on a connection
+ */
Uint64 TCP_Client_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
{
- return 0;
+ tTCPConnection *conn = Node->ImplPtr;
+ size_t rem = Length;
+
+ ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
+
+ // Check if connection is open
+ while( conn->State == TCP_ST_HALFOPEN || conn->State == TCP_ST_SYN_SENT )
+ Threads_Yield();
+ if( conn->State != TCP_ST_OPEN ) {
+ LEAVE('i', 0);
+ return 0;
+ }
+
+ while( rem > TCP_MAX_PACKET_SIZE )
+ {
+ TCP_INT_SendDataPacket(conn, TCP_MAX_PACKET_SIZE, Buffer);
+ Buffer += TCP_MAX_PACKET_SIZE;
+ }
+
+ TCP_INT_SendDataPacket(conn, rem, Buffer);
+
+ LEAVE('i', Length);
+ return Length;
+}
+
+/**
+ * \brief Open a connection to another host using TCP
+ * \param Conn Connection structure
+ */
+void TCP_StartConnection(tTCPConnection *Conn)
+{
+ tTCPHeader hdr;
+
+ Conn->State = TCP_ST_SYN_SENT;
+
+ hdr.SourcePort = htons(Conn->LocalPort);
+ hdr.DestPort = htons(Conn->RemotePort);
+ Conn->NextSequenceSend = rand();
+ hdr.SequenceNumber = htonl(Conn->NextSequenceSend);
+ hdr.DataOffset = (sizeof(tTCPHeader)/4) << 4;
+ hdr.Flags = TCP_FLAG_SYN;
+ hdr.WindowSize = htons(TCP_WINDOW_SIZE); // Max
+ hdr.Checksum = 0; // TODO
+ hdr.UrgentPointer = 0;
+
+ TCP_SendPacket( Conn, sizeof(tTCPHeader), &hdr );
+
+ Conn->NextSequenceSend ++;
+ Conn->State = TCP_ST_SYN_SENT;
+ return ;
}
/**
return 0;
case 7: // Connect
- if(conn->LocalPort == -1)
+ if(conn->LocalPort == 0xFFFF)
conn->LocalPort = TCP_GetUnusedPort();
if(conn->RemotePort == -1)
return 0;
void TCP_Client_Close(tVFS_Node *Node)
{
- free(Node->ImplPtr);
+ tTCPConnection *conn = Node->ImplPtr;
+ tTCPHeader packet;
+
+ packet.SourcePort = htons(conn->LocalPort);
+ packet.DestPort = htons(conn->RemotePort);
+ packet.DataOffset = (sizeof(tTCPHeader)/4)*16;
+ packet.WindowSize = TCP_WINDOW_SIZE;
+
+ packet.AcknowlegementNumber = 0;
+ packet.SequenceNumber = htonl(conn->NextSequenceSend);
+ packet.Flags = TCP_FLAG_FIN;
+
+ conn->State = TCP_ST_FIN_SENT;
+
+ TCP_SendPacket( conn, sizeof(tTCPHeader), &packet );
+
+ while( conn->State == TCP_ST_FIN_SENT ) Threads_Yield();
+
+ free(conn);
}
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au