+++ /dev/null
-/*
- * Acess2 IP Stack
- * - TCP Handling
- */
-#define DEBUG 1
-#include "ipstack.h"
-#include "ipv4.h"
-#include "tcp.h"
-
-#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_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer);
-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);
-// --- Server
-tVFS_Node *TCP_Server_Init(tInterface *Interface);
-char *TCP_Server_ReadDir(tVFS_Node *Node, int Pos);
-tVFS_Node *TCP_Server_FindDir(tVFS_Node *Node, const char *Name);
- int TCP_Server_IOCtl(tVFS_Node *Node, int ID, void *Data);
-void TCP_Server_Close(tVFS_Node *Node);
-// --- Client
-tVFS_Node *TCP_Client_Init(tInterface *Interface);
-Uint64 TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
-Uint64 TCP_Client_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
- int TCP_Client_IOCtl(tVFS_Node *Node, int ID, void *Data);
-void TCP_Client_Close(tVFS_Node *Node);
-
-// === TEMPLATES ===
-tSocketFile gTCP_ServerFile = {NULL, "tcps", TCP_Server_Init};
-tSocketFile gTCP_ClientFile = {NULL, "tcpc", TCP_Client_Init};
-
-// === GLOBALS ===
- int giTCP_NumHalfopen = 0;
-tShortSpinlock glTCP_Listeners;
-tTCPListener *gTCP_Listeners;
-tShortSpinlock glTCP_OutbountCons;
-tTCPConnection *gTCP_OutbountCons;
-Uint32 gaTCP_PortBitmap[0x800];
- int giTCP_NextOutPort = TCP_MIN_DYNPORT;
-
-// === CODE ===
-/**
- * \brief Initialise the TCP Layer
- *
- * Registers the client and server files and the GetPacket callback
- */
-void TCP_Initialise()
-{
- IPStack_AddFile(&gTCP_ServerFile);
- IPStack_AddFile(&gTCP_ClientFile);
- IPv4_RegisterCallback(IP4PROT_TCP, TCP_GetPacket);
-}
-
-/**
- * \brief Sends a packet from the specified connection, calculating the checksums
- * \param Conn Connection
- * \param Length Length of data
- * \param Data Packet data (cast as a TCP Header)
- */
-void TCP_SendPacket( tTCPConnection *Conn, size_t Length, tTCPHeader *Data )
-{
- size_t buflen;
- Uint32 *buf;
- switch( Conn->Interface->Type )
- {
- case 4: // Append IPv4 Pseudo Header
- buflen = 4 + 4 + 4 + ((Length+1)&~1);
- buf = malloc( buflen );
- buf[0] = ((tIPv4*)Conn->Interface->Address)->L;
- buf[1] = Conn->RemoteIP.v4.L;
- buf[2] = (htons(Length)<<16) | (6<<8) | 0;
- Data->Checksum = 0;
- memcpy( &buf[3], Data, Length );
- Data->Checksum = htons( IPv4_Checksum( buf, buflen ) );
- free(buf);
- IPv4_SendPacket(Conn->Interface, Conn->RemoteIP.v4, IP4PROT_TCP, 0, Length, Data);
- break;
- }
-}
-
-/**
- * \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)
-{
- tTCPHeader *hdr = Buffer;
- tTCPListener *srv;
- tTCPConnection *conn;
-
- 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));
-*/
- Log_Log("TCP", "Flags = %s%s%s%s%s%s",
- (hdr->Flags & TCP_FLAG_CWR) ? "CWR " : "",
- (hdr->Flags & TCP_FLAG_ECE) ? "ECE " : "",
- (hdr->Flags & TCP_FLAG_URG) ? "URG " : "",
- (hdr->Flags & TCP_FLAG_ACK) ? "ACK " : "",
- (hdr->Flags & TCP_FLAG_PSH) ? "PSH " : "",
- (hdr->Flags & TCP_FLAG_RST) ? "RST " : "",
- (hdr->Flags & TCP_FLAG_SYN) ? "SYN " : "",
- (hdr->Flags & TCP_FLAG_FIN) ? "FIN " : ""
- );
-
- if( Length > (hdr->DataOffset >> 4)*4 )
- {
- Debug_HexDump(
- "[TCP ] Packet Data = ",
- (Uint8*)hdr + (hdr->DataOffset >> 4)*4,
- Length - (hdr->DataOffset >> 4)*4
- );
- }
-
- // Check Servers
- {
- for( srv = gTCP_Listeners; srv; srv = srv->Next )
- {
- // Check if the server is active
- if(srv->Port == 0) continue;
- // Check the interface
- if(srv->Interface && srv->Interface != Interface) continue;
- // Check the destination port
- 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
- 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))
- continue;
- 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, Length);
-
- return;
- }
-
- Log_Log("TCP", "Opening Connection");
- // Open a new connection (well, check that it's a SYN)
- 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
- SHORTLOCK(&srv->lConnections);
- if( !srv->Connections )
- srv->Connections = conn;
- else
- srv->ConnectionsTail->Next = conn;
- srv->ConnectionsTail = conn;
- if(!srv->NewConnections)
- srv->NewConnections = conn;
- SHORTREL(&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 ;
- }
- }
-
-
- // Check Open Connections
- {
- for( conn = gTCP_OutbountCons; conn; conn = conn->Next )
- {
- // Check that it is coming in on the same interface
- if(conn->Interface != Interface) continue;
-
- // Check Source Port
- if(conn->RemotePort != ntohs(hdr->SourcePort)) continue;
-
- // Check Source IP
- if(conn->Interface->Type == 6 && !IP6_EQU(conn->RemoteIP.v6, *(tIPv6*)Address))
- continue;
- if(conn->Interface->Type == 4 && !IP4_EQU(conn->RemoteIP.v4, *(tIPv4*)Address))
- continue;
-
- 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, int Length)
-{
- tTCPStoredPacket *pkt;
- int dataLen;
-
- // Syncronise sequence values
- if(Header->Flags & TCP_FLAG_SYN) {
- Connection->NextSequenceRcv = ntohl(Header->SequenceNumber) + 1;
- }
-
- // Handle a server replying to our initial SYN
- 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;
- }
- }
-
- // Handle a client confirming the connection
- if( Connection->State == TCP_ST_HALFOPEN && (Header->Flags & TCP_FLAG_ACK) )
- {
- Connection->State = TCP_ST_OPEN;
- Log_Log("TCP", "Connection fully opened");
- }
-
- // 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 ;
- }
- }
-
- // Check for an empty packet
- 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
- SHORTLOCK( &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;
- SHORTREL( &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)
-{
- Mutex_Acquire( &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 );
-
- Mutex_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.
- SHORTLOCK( &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) {
- SHORTREL( &Connection->lFuturePackets );
- return;
- }
-
- // Delete packet from future list
- if(prev)
- prev->Next = pkt->Next;
- else
- Connection->FuturePackets = pkt->Next;
-
- // Release list
- SHORTREL( &Connection->lFuturePackets );
-
- // Looks like we found one
- TCP_INT_AppendRecieved(Connection, pkt);
- Connection->NextSequenceRcv += pkt->Length;
- free(pkt);
- }
-}
-
-/**
- * \fn Uint16 TCP_GetUnusedPort()
- * \brief Gets an unused port and allocates it
- */
-Uint16 TCP_GetUnusedPort()
-{
- Uint16 ret;
-
- // Get Next outbound port
- ret = giTCP_NextOutPort++;
- while( gaTCP_PortBitmap[ret/32] & (1 << (ret%32)) )
- {
- ret ++;
- giTCP_NextOutPort++;
- if(giTCP_NextOutPort == 0x10000) {
- ret = giTCP_NextOutPort = TCP_MIN_DYNPORT;
- }
- }
-
- // Mark the new port as used
- gaTCP_PortBitmap[ret/32] |= 1 << (ret%32);
-
- return ret;
-}
-
-/**
- * \fn int TCP_AllocatePort(Uint16 Port)
- * \brief Marks a port as used
- */
-int TCP_AllocatePort(Uint16 Port)
-{
- // Check if the port has already been allocated
- if( gaTCP_PortBitmap[Port/32] & (1 << (Port%32)) )
- return 0;
-
- // Allocate
- gaTCP_PortBitmap[Port/32] |= 1 << (Port%32);
-
- return 1;
-}
-
-/**
- * \fn int TCP_DeallocatePort(Uint16 Port)
- * \brief Marks a port as unused
- */
-int TCP_DeallocatePort(Uint16 Port)
-{
- // Check if the port has already been allocated
- if( !(gaTCP_PortBitmap[Port/32] & (1 << (Port%32))) )
- return 0;
-
- // Allocate
- gaTCP_PortBitmap[Port/32] &= ~(1 << (Port%32));
-
- return 1;
-}
-
-// --- Server
-tVFS_Node *TCP_Server_Init(tInterface *Interface)
-{
- 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;
- srv->Node.ReadDir = TCP_Server_ReadDir;
- srv->Node.FindDir = TCP_Server_FindDir;
- srv->Node.IOCtl = TCP_Server_IOCtl;
- srv->Node.Close = TCP_Server_Close;
-
- SHORTLOCK(&glTCP_Listeners);
- srv->Next = gTCP_Listeners;
- gTCP_Listeners = srv;
- SHORTREL(&glTCP_Listeners);
-
- return &srv->Node;
-}
-
-/**
- * \brief Wait for a new connection and return the connection ID
- * \note Blocks until a new connection is made
- * \param Node Server node
- * \param Pos Position (ignored)
- */
-char *TCP_Server_ReadDir(tVFS_Node *Node, int Pos)
-{
- tTCPListener *srv = Node->ImplPtr;
- tTCPConnection *conn;
- char *ret;
-
- ENTER("pNode iPos", Node, Pos);
-
- Log_Log("TCP", "Thread %i waiting for a connection", Threads_GetTID());
- for(;;)
- {
- SHORTLOCK( &srv->lConnections );
- if( srv->NewConnections != NULL ) break;
- SHORTREL( &srv->lConnections );
- Threads_Yield(); // TODO: Sleep until poked
- continue;
- }
-
-
- // Increment the new list (the current connection is still on the
- // normal list)
- conn = srv->NewConnections;
- srv->NewConnections = conn->Next;
-
- SHORTREL( &srv->lConnections );
-
- LOG("conn = %p", conn);
- LOG("srv->Connections = %p", srv->Connections);
- LOG("srv->NewConnections = %p", srv->NewConnections);
- LOG("srv->ConnectionsTail = %p", srv->ConnectionsTail);
-
- ret = malloc(9);
- itoa(ret, conn->Node.ImplInt, 16, 8, '0');
- Log_Log("TCP", "Thread %i got '%s'", Threads_GetTID(), ret);
- LEAVE('s', ret);
- return ret;
-}
-
-/**
- * \brief Gets a client connection node
- * \param Node Server node
- * \param Name Hexadecimal ID of the node
- */
-tVFS_Node *TCP_Server_FindDir(tVFS_Node *Node, const char *Name)
-{
- 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
- SHORTLOCK( &srv->lConnections );
- for(conn = srv->Connections;
- conn;
- conn = conn->Next)
- {
- LOG("conn->Node.ImplInt = %i", conn->Node.ImplInt);
- if(conn->Node.ImplInt == id) break;
- }
- SHORTREL( &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;
-
- switch(ID)
- {
- case 4: // Get/Set Port
- if(!Data) // Get Port
- return srv->Port;
-
- if(srv->Port) // Wait, you can't CHANGE the port
- return -1;
-
- if(!CheckMem(Data, sizeof(Uint16))) // Sanity check
- return -1;
-
- // Permissions check
- if(Threads_GetUID() != 0
- && *(Uint16*)Data != 0
- && *(Uint16*)Data < 1024)
- return -1;
-
- // TODO: Check if a port is in use
-
- // Set Port
- srv->Port = *(Uint16*)Data;
- if(srv->Port == 0) // Allocate a random port
- 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;
-}
-
-void TCP_Server_Close(tVFS_Node *Node)
-{
- free(Node->ImplPtr);
-}
-
-// --- 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 = -1;
- conn->RemotePort = -1;
- memset( &conn->RemoteIP, 0, sizeof(conn->RemoteIP) );
-
- conn->Node.ImplPtr = conn;
- conn->Node.NumACLs = 1;
- conn->Node.ACLs = &gVFS_ACL_EveryoneRW;
- conn->Node.Read = TCP_Client_Read;
- conn->Node.Write = TCP_Client_Write;
- conn->Node.IOCtl = TCP_Client_IOCtl;
- conn->Node.Close = TCP_Client_Close;
-
- conn->RecievedBuffer = RingBuffer_Create( TCP_RECIEVE_BUFFER_SIZE );
-
- SHORTLOCK(&glTCP_OutbountCons);
- conn->Next = gTCP_OutbountCons;
- gTCP_OutbountCons = conn;
- SHORTREL(&glTCP_OutbountCons);
-
- 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)
-{
- 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
- Mutex_Acquire( &conn->lRecievedPackets );
- if( conn->RecievedBuffer->Length == 0 ) {
- // If not, release the lock, yield and try again
- Mutex_Release( &conn->lRecievedPackets );
- Threads_Yield(); // TODO: Less expensive wait
- continue;
- }
-
- // Attempt to read all `Length` bytes
- len = RingBuffer_Read( destbuf, conn->RecievedBuffer, Length );
-
- // Release the lock (we don't need it any more)
- Mutex_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)
-{
- 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 = {0};
-
- 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
-
- TCP_SendPacket( Conn, sizeof(tTCPHeader), &hdr );
-
- Conn->NextSequenceSend ++;
- Conn->State = TCP_ST_SYN_SENT;
- return ;
-}
-
-/**
- * \brief Control a client socket
- */
-int TCP_Client_IOCtl(tVFS_Node *Node, int ID, void *Data)
-{
- tTCPConnection *conn = Node->ImplPtr;
-
- switch(ID)
- {
- case 4: // Get/Set local port
- if(!Data)
- return conn->LocalPort;
- if(conn->State != TCP_ST_CLOSED)
- return -1;
- if(!CheckMem(Data, sizeof(Uint16)))
- return -1;
-
- if(Threads_GetUID() != 0 && *(Uint16*)Data < 1024)
- return -1;
-
- conn->LocalPort = *(Uint16*)Data;
- return 0;
-
- case 5: // Get/Set remote port
- if(!Data) return conn->RemotePort;
- if(conn->State != TCP_ST_CLOSED) return -1;
- if(!CheckMem(Data, sizeof(Uint16))) return -1;
- conn->RemotePort = *(Uint16*)Data;
- return conn->RemotePort;
-
- case 6: // Set Remote IP
- if( conn->State != TCP_ST_CLOSED )
- return -1;
- if( conn->Interface->Type == 4 )
- {
- if(!CheckMem(Data, sizeof(tIPv4))) return -1;
- conn->RemoteIP.v4 = *(tIPv4*)Data;
- }
- else if( conn->Interface->Type == 6 )
- {
- if(!CheckMem(Data, sizeof(tIPv6))) return -1;
- conn->RemoteIP.v6 = *(tIPv6*)Data;
- }
- return 0;
-
- case 7: // Connect
- if(conn->LocalPort == 0xFFFF)
- conn->LocalPort = TCP_GetUnusedPort();
- if(conn->RemotePort == -1)
- return 0;
-
- TCP_StartConnection(conn);
- return 1;
-
- // Get recieve buffer length
- case 8:
- return conn->RecievedBuffer->Length;
- }
-
- return 0;
-}
-
-void TCP_Client_Close(tVFS_Node *Node)
-{
- 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
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