12 #define TCP_MIN_DYNPORT 0xC000
13 #define TCP_MAX_HALFOPEN 1024 // Should be enough
15 #define TCP_MAX_PACKET_SIZE 1024
16 #define TCP_WINDOW_SIZE 0x2000
17 #define TCP_RECIEVE_BUFFER_SIZE 0x4000
20 void TCP_Initialise();
21 void TCP_StartConnection(tTCPConnection *Conn);
22 void TCP_SendPacket(tTCPConnection *Conn, size_t Length, tTCPHeader *Data);
23 void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer);
24 void TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header, int Length);
25 void TCP_INT_AppendRecieved(tTCPConnection *Connection, tTCPStoredPacket *Ptk);
26 void TCP_INT_UpdateRecievedFromFuture(tTCPConnection *Connection);
27 Uint16 TCP_GetUnusedPort();
28 int TCP_AllocatePort(Uint16 Port);
29 int TCP_DeallocatePort(Uint16 Port);
31 tVFS_Node *TCP_Server_Init(tInterface *Interface);
32 char *TCP_Server_ReadDir(tVFS_Node *Node, int Pos);
33 tVFS_Node *TCP_Server_FindDir(tVFS_Node *Node, const char *Name);
34 int TCP_Server_IOCtl(tVFS_Node *Node, int ID, void *Data);
35 void TCP_Server_Close(tVFS_Node *Node);
37 tVFS_Node *TCP_Client_Init(tInterface *Interface);
38 Uint64 TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
39 Uint64 TCP_Client_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
40 int TCP_Client_IOCtl(tVFS_Node *Node, int ID, void *Data);
41 void TCP_Client_Close(tVFS_Node *Node);
43 int WrapBetween(Uint32 Lower, Uint32 Value, Uint32 Higher, Uint32 MaxValue);
46 tSocketFile gTCP_ServerFile = {NULL, "tcps", TCP_Server_Init};
47 tSocketFile gTCP_ClientFile = {NULL, "tcpc", TCP_Client_Init};
50 int giTCP_NumHalfopen = 0;
51 tShortSpinlock glTCP_Listeners;
52 tTCPListener *gTCP_Listeners;
53 tShortSpinlock glTCP_OutbountCons;
54 tTCPConnection *gTCP_OutbountCons;
55 Uint32 gaTCP_PortBitmap[0x800];
56 int giTCP_NextOutPort = TCP_MIN_DYNPORT;
60 * \brief Initialise the TCP Layer
62 * Registers the client and server files and the GetPacket callback
66 IPStack_AddFile(&gTCP_ServerFile);
67 IPStack_AddFile(&gTCP_ClientFile);
68 IPv4_RegisterCallback(IP4PROT_TCP, TCP_GetPacket);
72 * \brief Sends a packet from the specified connection, calculating the checksums
73 * \param Conn Connection
74 * \param Length Length of data
75 * \param Data Packet data (cast as a TCP Header)
77 void TCP_SendPacket( tTCPConnection *Conn, size_t Length, tTCPHeader *Data )
81 switch( Conn->Interface->Type )
83 case 4: // Append IPv4 Pseudo Header
84 buflen = 4 + 4 + 4 + ((Length+1)&~1);
85 buf = malloc( buflen );
86 buf[0] = ((tIPv4*)Conn->Interface->Address)->L;
87 buf[1] = Conn->RemoteIP.v4.L;
88 buf[2] = (htons(Length)<<16) | (6<<8) | 0;
90 memcpy( &buf[3], Data, Length );
91 Data->Checksum = htons( IPv4_Checksum( buf, buflen ) );
93 IPv4_SendPacket(Conn->Interface, Conn->RemoteIP.v4, IP4PROT_TCP, 0, Length, Data);
99 * \brief Handles a packet from the IP Layer
100 * \param Interface Interface the packet arrived from
101 * \param Address Pointer to the addres structure
102 * \param Length Size of packet in bytes
103 * \param Buffer Packet data
105 void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
107 tTCPHeader *hdr = Buffer;
109 tTCPConnection *conn;
111 Log_Log("TCP", "TCP_GetPacket: SourcePort = %i, DestPort = %i",
112 ntohs(hdr->SourcePort), ntohs(hdr->DestPort));
114 Log_Log("TCP", "TCP_GetPacket: SequenceNumber = 0x%x", ntohl(hdr->SequenceNumber));
115 Log_Log("TCP", "TCP_GetPacket: AcknowlegementNumber = 0x%x", ntohl(hdr->AcknowlegementNumber));
116 Log_Log("TCP", "TCP_GetPacket: DataOffset = %i", hdr->DataOffset >> 4);
117 Log_Log("TCP", "TCP_GetPacket: WindowSize = %i", htons(hdr->WindowSize));
118 Log_Log("TCP", "TCP_GetPacket: Checksum = 0x%x", htons(hdr->Checksum));
119 Log_Log("TCP", "TCP_GetPacket: UrgentPointer = 0x%x", htons(hdr->UrgentPointer));
121 Log_Log("TCP", "TCP_GetPacket: Flags = %s%s%s%s%s%s%s%s",
122 (hdr->Flags & TCP_FLAG_CWR) ? "CWR " : "",
123 (hdr->Flags & TCP_FLAG_ECE) ? "ECE " : "",
124 (hdr->Flags & TCP_FLAG_URG) ? "URG " : "",
125 (hdr->Flags & TCP_FLAG_ACK) ? "ACK " : "",
126 (hdr->Flags & TCP_FLAG_PSH) ? "PSH " : "",
127 (hdr->Flags & TCP_FLAG_RST) ? "RST " : "",
128 (hdr->Flags & TCP_FLAG_SYN) ? "SYN " : "",
129 (hdr->Flags & TCP_FLAG_FIN) ? "FIN " : ""
132 if( Length > (hdr->DataOffset >> 4)*4 )
134 Log_Log("TCP", "TCP_GetPacket: SequenceNumber = 0x%x", ntohl(hdr->SequenceNumber));
136 "[TCP ] Packet Data = ",
137 (Uint8*)hdr + (hdr->DataOffset >> 4)*4,
138 Length - (hdr->DataOffset >> 4)*4
144 for( srv = gTCP_Listeners; srv; srv = srv->Next )
146 // Check if the server is active
147 if(srv->Port == 0) continue;
148 // Check the interface
149 if(srv->Interface && srv->Interface != Interface) continue;
150 // Check the destination port
151 if(srv->Port != htons(hdr->DestPort)) continue;
153 Log_Log("TCP", "TCP_GetPacket: Matches server %p", srv);
154 // Is this in an established connection?
155 for( conn = srv->Connections; conn; conn = conn->Next )
157 Log_Log("TCP", "TCP_GetPacket: conn->Interface(%p) == Interface(%p)",
158 conn->Interface, Interface);
159 // Check that it is coming in on the same interface
160 if(conn->Interface != Interface) continue;
163 Log_Log("TCP", "TCP_GetPacket: conn->RemotePort(%i) == hdr->SourcePort(%i)",
164 conn->RemotePort, ntohs(hdr->SourcePort));
165 if(conn->RemotePort != ntohs(hdr->SourcePort)) continue;
168 if(conn->Interface->Type == 6 && !IP6_EQU(conn->RemoteIP.v6, *(tIPv6*)Address))
170 if(conn->Interface->Type == 4 && !IP4_EQU(conn->RemoteIP.v4, *(tIPv4*)Address))
173 Log_Log("TCP", "TCP_GetPacket: Matches connection %p", conn);
174 // We have a response!
175 TCP_INT_HandleConnectionPacket(conn, hdr, Length);
180 Log_Log("TCP", "TCP_GetPacket: Opening Connection");
181 // Open a new connection (well, check that it's a SYN)
182 if(hdr->Flags != TCP_FLAG_SYN) {
183 Log_Log("TCP", "TCP_GetPacket: Packet is not a SYN");
187 // TODO: Check for halfopen max
189 conn = calloc(1, sizeof(tTCPConnection));
190 conn->State = TCP_ST_SYN_RCVD;
191 conn->LocalPort = srv->Port;
192 conn->RemotePort = ntohs(hdr->SourcePort);
193 conn->Interface = Interface;
195 switch(Interface->Type)
197 case 4: conn->RemoteIP.v4 = *(tIPv4*)Address; break;
198 case 6: conn->RemoteIP.v6 = *(tIPv6*)Address; break;
201 conn->RecievedBuffer = RingBuffer_Create( TCP_RECIEVE_BUFFER_SIZE );
203 conn->NextSequenceRcv = ntohl( hdr->SequenceNumber ) + 1;
204 conn->NextSequenceSend = rand();
207 conn->Node.NumACLs = 1;
208 conn->Node.ACLs = &gVFS_ACL_EveryoneRW;
209 conn->Node.ImplPtr = conn;
210 conn->Node.ImplInt = srv->NextID ++;
211 conn->Node.Read = TCP_Client_Read;
212 conn->Node.Write = TCP_Client_Write;
213 //conn->Node.Close = TCP_SrvConn_Close;
215 // Hmm... Theoretically, this lock will never have to wait,
216 // as the interface is locked to the watching thread, and this
217 // runs in the watching thread. But, it's a good idea to have
219 // Oh, wait, there is a case where a wildcard can be used
220 // (srv->Interface == NULL) so having the lock is a good idea
221 SHORTLOCK(&srv->lConnections);
222 if( !srv->Connections )
223 srv->Connections = conn;
225 srv->ConnectionsTail->Next = conn;
226 srv->ConnectionsTail = conn;
227 if(!srv->NewConnections)
228 srv->NewConnections = conn;
229 SHORTREL(&srv->lConnections);
232 hdr->Flags |= TCP_FLAG_ACK;
233 hdr->AcknowlegementNumber = htonl(conn->NextSequenceRcv);
234 hdr->SequenceNumber = htonl(conn->NextSequenceSend);
235 hdr->DestPort = hdr->SourcePort;
236 hdr->SourcePort = htons(srv->Port);
237 hdr->DataOffset = (sizeof(tTCPHeader)/4) << 4;
238 TCP_SendPacket( conn, sizeof(tTCPHeader), hdr );
239 conn->NextSequenceSend ++;
245 // Check Open Connections
247 for( conn = gTCP_OutbountCons; conn; conn = conn->Next )
249 // Check that it is coming in on the same interface
250 if(conn->Interface != Interface) continue;
253 if(conn->RemotePort != ntohs(hdr->SourcePort)) continue;
256 if(conn->Interface->Type == 6 && !IP6_EQU(conn->RemoteIP.v6, *(tIPv6*)Address))
258 if(conn->Interface->Type == 4 && !IP4_EQU(conn->RemoteIP.v4, *(tIPv4*)Address))
261 TCP_INT_HandleConnectionPacket(conn, hdr, Length);
266 Log_Log("TCP", "TCP_GetPacket: No Match");
270 * \brief Handles a packet sent to a specific connection
271 * \param Connection TCP Connection pointer
272 * \param Header TCP Packet pointer
273 * \param Length Length of the packet
275 void TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header, int Length)
277 tTCPStoredPacket *pkt;
280 // Silently drop once finished
281 // TODO: Check if this needs to be here
282 if( Connection->State == TCP_ST_FINISHED ) {
283 Log_Log("TCP", "Packet ignored - connection finnished");
287 // Syncronise sequence values
288 if(Header->Flags & TCP_FLAG_SYN) {
289 // TODO: What if the packet also has data?
290 Connection->NextSequenceRcv = ntohl(Header->SequenceNumber);
293 // Ackowledge a sent packet
294 if(Header->Flags & TCP_FLAG_ACK) {
295 // TODO: Process an ACKed Packet
296 Log_Log("TCP", "Conn %p, Sent packet 0x%x ACKed", Connection, Header->AcknowlegementNumber);
299 // Get length of data
300 dataLen = Length - (Header->DataOffset>>4)*4;
301 Log_Log("TCP", "HandleConnectionPacket - dataLen = %i", dataLen);
306 switch( Connection->State )
308 // Pre-init conneciton?
310 Log_Log("TCP", "Packets to a closed connection?!");
313 // --- Init States ---
314 // SYN sent, expecting SYN-ACK Connection Opening
315 case TCP_ST_SYN_SENT:
316 if( Header->Flags & TCP_FLAG_SYN )
318 Connection->NextSequenceRcv ++;
319 Header->DestPort = Header->SourcePort;
320 Header->SourcePort = htons(Connection->LocalPort);
321 Header->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
322 Header->SequenceNumber = htonl(Connection->NextSequenceSend);
323 Header->WindowSize = htons(TCP_WINDOW_SIZE);
324 Header->Flags = TCP_FLAG_ACK;
325 Header->DataOffset = (sizeof(tTCPHeader)/4) << 4;
326 TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
328 if( Header->Flags & TCP_FLAG_ACK )
330 Log_Log("TCP", "ACKing SYN-ACK");
331 Connection->State = TCP_ST_OPEN;
335 Log_Log("TCP", "ACKing SYN");
336 Connection->State = TCP_ST_SYN_RCVD;
341 // SYN-ACK sent, expecting ACK
342 case TCP_ST_SYN_RCVD:
343 if( Header->Flags & TCP_FLAG_ACK )
345 // TODO: Handle max half-open limit
346 Connection->State = TCP_ST_OPEN;
347 Log_Log("TCP", "Connection fully opened");
351 // --- Established State ---
353 // - Handle State changes
355 if( Header->Flags & TCP_FLAG_FIN ) {
356 Log_Log("TCP", "Conn %p closed, recieved FIN, acknowledging", Connection);
357 VFS_MarkError(&Connection->Node, 1);
358 Connection->State = TCP_ST_CLOSE_WAIT;
359 // CLOSE WAIT requires the client to close (or does it?)
365 // Check for an empty packet
367 if( Header->Flags != TCP_FLAG_ACK )
369 Connection->NextSequenceRcv ++; // TODO: Is this right? (empty packet counts as one byte)
370 Log_Log("TCP", "Empty Packet, inc and ACK the current sequence number");
373 Log_Log("TCP", "Empty Packet, just ACKing the current sequence number");
374 Header->DestPort = Header->SourcePort;
375 Header->SourcePort = htons(Connection->LocalPort);
376 Header->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
377 Header->SequenceNumber = htonl(Connection->NextSequenceSend);
378 Header->Flags |= TCP_FLAG_ACK;
379 TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
388 // Allocate and fill cached packet
389 pkt = malloc( sizeof(tTCPStoredPacket) + dataLen );
391 pkt->Sequence = ntohl(Header->SequenceNumber);
392 pkt->Length = dataLen;
393 memcpy(pkt->Data, (Uint8*)Header + (Header->DataOffset>>4)*4, dataLen);
395 Log_Log("TCP", "0x%08x <= 0x%08x < 0x%08x",
396 Connection->NextSequenceRcv,
398 Connection->NextSequenceRcv + TCP_WINDOW_SIZE
401 // Is this packet the next expected packet?
402 if( pkt->Sequence == Connection->NextSequenceRcv )
404 // Ooh, Goodie! Add it to the recieved list
405 TCP_INT_AppendRecieved(Connection, pkt);
407 Log_Log("TCP", "0x%08x += %i", Connection->NextSequenceRcv, dataLen);
408 Connection->NextSequenceRcv += dataLen;
410 // TODO: This should be moved out of the watcher thread,
411 // so that a single lost packet on one connection doesn't cause
412 // all connections on the interface to lag.
413 TCP_INT_UpdateRecievedFromFuture(Connection);
416 Header->DestPort = Header->SourcePort;
417 Header->SourcePort = htons(Connection->LocalPort);
418 Header->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
419 Header->SequenceNumber = htonl(Connection->NextSequenceSend);
420 Header->WindowSize = htons(TCP_WINDOW_SIZE);
421 Header->Flags &= TCP_FLAG_SYN; // Eliminate all flags save for SYN
422 Header->Flags |= TCP_FLAG_ACK; // Add ACK
423 Log_Log("TCP", "Sending ACK for 0x%08x", Connection->NextSequenceRcv);
424 TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
425 //Connection->NextSequenceSend ++;
427 // Check if the packet is in window
428 else if( WrapBetween(Connection->NextSequenceRcv, pkt->Sequence, Connection->NextSequenceRcv+TCP_WINDOW_SIZE, 0xFFFFFFFF) )
430 tTCPStoredPacket *tmp, *prev = NULL;
432 Log_Log("TCP", "We missed a packet, caching",
433 pkt->Sequence, Connection->NextSequenceRcv);
435 // No? Well, let's cache it and look at it later
436 SHORTLOCK( &Connection->lFuturePackets );
437 for(tmp = Connection->FuturePackets;
439 prev = tmp, tmp = tmp->Next)
441 if(tmp->Sequence >= pkt->Sequence) break;
444 // Add if before first, or sequences don't match
445 if( !tmp || tmp->Sequence != pkt->Sequence )
450 Connection->FuturePackets = pkt;
454 else if(pkt->Length > tmp->Length)
458 pkt->Next = tmp->Next;
465 SHORTREL( &Connection->lFuturePackets );
467 // Badly out of sequence packet
470 Log_Log("TCP", "Fully out of sequence packet (0x%08x not between 0x%08x and 0x%08x), dropped",
471 pkt->Sequence, Connection->NextSequenceRcv, Connection->NextSequenceRcv+TCP_WINDOW_SIZE);
473 // TODO: Spec says we should send an empty ACK with the current state
477 // --- Remote close states
478 case TCP_ST_CLOSE_WAIT:
480 // Ignore everything, CLOSE_WAIT is terminated by the client
481 Log_Debug("TCP", "CLOSE WAIT - Ignoring packets");
485 // LAST-ACK - Waiting for the ACK of FIN (from CLOSE WAIT)
486 case TCP_ST_LAST_ACK:
487 if( Header->Flags & TCP_FLAG_ACK )
489 Connection->State = TCP_ST_FINISHED; // Connection completed
490 Log_Log("TCP", "LAST-ACK to CLOSED - Connection remote closed");
491 // TODO: Destrory the TCB
495 // --- Local close States
496 case TCP_ST_FIN_WAIT1:
497 if( Header->Flags & TCP_FLAG_FIN )
499 Connection->State = TCP_ST_CLOSING;
500 Log_Debug("TCP", "Conn %p closed, sent FIN and recieved FIN", Connection);
501 VFS_MarkError(&Connection->Node, 1);
504 Header->DestPort = Header->SourcePort;
505 Header->SourcePort = htons(Connection->LocalPort);
506 Header->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
507 Header->SequenceNumber = htonl(Connection->NextSequenceSend);
508 Header->WindowSize = htons(TCP_WINDOW_SIZE);
509 Header->Flags = TCP_FLAG_ACK;
510 TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
514 // TODO: Make sure that the packet is actually ACKing the FIN
515 if( Header->Flags & TCP_FLAG_ACK )
517 Connection->State = TCP_ST_FIN_WAIT2;
518 Log_Debug("TCP", "Conn %p closed, sent FIN ACKed", Connection);
519 VFS_MarkError(&Connection->Node, 1);
524 case TCP_ST_FIN_WAIT2:
525 if( Header->Flags & TCP_FLAG_FIN )
527 Connection->State = TCP_ST_TIME_WAIT;
528 Log_Debug("TCP", "FIN sent and recieved, ACKing and going into TIME WAIT %p FINWAIT-2 -> TIME WAIT", Connection);
530 Header->DestPort = Header->SourcePort;
531 Header->SourcePort = htons(Connection->LocalPort);
532 Header->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
533 Header->SequenceNumber = htonl(Connection->NextSequenceSend);
534 Header->WindowSize = htons(TCP_WINDOW_SIZE);
535 Header->Flags = TCP_FLAG_ACK;
536 TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
541 // TODO: Make sure that the packet is actually ACKing the FIN
542 if( Header->Flags & TCP_FLAG_ACK )
544 Connection->State = TCP_ST_TIME_WAIT;
545 Log_Debug("TCP", "Conn %p CLOSING -> TIME WAIT", Connection);
546 VFS_MarkError(&Connection->Node, 1);
551 // --- Closed (or near closed) states) ---
552 case TCP_ST_TIME_WAIT:
553 Log_Log("TCP", "Packets on Time-Wait, ignored");
556 case TCP_ST_FINISHED:
557 Log_Log("TCP", "Packets when CLOSED, ignoring");
561 // Log_Warning("TCP", "Unhandled TCP state %i", Connection->State);
568 * \brief Appends a packet to the recieved list
569 * \param Connection Connection structure
570 * \param Pkt Packet structure on heap
572 void TCP_INT_AppendRecieved(tTCPConnection *Connection, tTCPStoredPacket *Pkt)
574 Mutex_Acquire( &Connection->lRecievedPackets );
575 if(Connection->RecievedBuffer->Length + Pkt->Length > Connection->RecievedBuffer->Space )
577 Log_Error("TCP", "Buffer filled, packet dropped (%s)",
578 // TCP_INT_DumpConnection(Connection)
584 RingBuffer_Write( Connection->RecievedBuffer, Pkt->Data, Pkt->Length );
587 VFS_MarkAvaliable(&Connection->Node, 1);
590 Mutex_Release( &Connection->lRecievedPackets );
594 * \brief Updates the connections recieved list from the future list
595 * \param Connection Connection structure
597 * Updates the recieved packets list with packets from the future (out
598 * of order) packets list that are now able to be added in direct
601 void TCP_INT_UpdateRecievedFromFuture(tTCPConnection *Connection)
603 tTCPStoredPacket *pkt;
606 SHORTLOCK( &Connection->lFuturePackets );
608 // Clear out duplicates from cache
609 // - If a packet has just been recieved, and it is expected, then
610 // (since NextSequenceRcv = rcvd->Sequence + rcvd->Length) all
611 // packets in cache that are smaller than the next expected
613 pkt = Connection->FuturePackets;
614 while(pkt && pkt->Sequence < Connection->NextSequenceRcv)
616 tTCPStoredPacket *next = pkt->Next;
621 // If there's no packets left in cache, stop looking
622 if(!pkt || pkt->Sequence > Connection->NextSequenceRcv) {
623 SHORTREL( &Connection->lFuturePackets );
627 // Delete packet from future list
628 Connection->FuturePackets = pkt->Next;
631 SHORTREL( &Connection->lFuturePackets );
633 // Looks like we found one
634 TCP_INT_AppendRecieved(Connection, pkt);
635 Connection->NextSequenceRcv += pkt->Length;
641 * \fn Uint16 TCP_GetUnusedPort()
642 * \brief Gets an unused port and allocates it
644 Uint16 TCP_GetUnusedPort()
648 // Get Next outbound port
649 ret = giTCP_NextOutPort++;
650 while( gaTCP_PortBitmap[ret/32] & (1 << (ret%32)) )
654 if(giTCP_NextOutPort == 0x10000) {
655 ret = giTCP_NextOutPort = TCP_MIN_DYNPORT;
659 // Mark the new port as used
660 gaTCP_PortBitmap[ret/32] |= 1 << (ret%32);
666 * \fn int TCP_AllocatePort(Uint16 Port)
667 * \brief Marks a port as used
669 int TCP_AllocatePort(Uint16 Port)
671 // Check if the port has already been allocated
672 if( gaTCP_PortBitmap[Port/32] & (1 << (Port%32)) )
676 gaTCP_PortBitmap[Port/32] |= 1 << (Port%32);
682 * \fn int TCP_DeallocatePort(Uint16 Port)
683 * \brief Marks a port as unused
685 int TCP_DeallocatePort(Uint16 Port)
687 // Check if the port has already been allocated
688 if( !(gaTCP_PortBitmap[Port/32] & (1 << (Port%32))) )
692 gaTCP_PortBitmap[Port/32] &= ~(1 << (Port%32));
698 tVFS_Node *TCP_Server_Init(tInterface *Interface)
702 srv = malloc( sizeof(tTCPListener) );
705 Log_Warning("TCP", "malloc failed for listener (%i) bytes", sizeof(tTCPListener));
709 srv->Interface = Interface;
712 srv->Connections = NULL;
713 srv->ConnectionsTail = NULL;
714 srv->NewConnections = NULL;
716 srv->Node.Flags = VFS_FFLAG_DIRECTORY;
718 srv->Node.ImplPtr = srv;
719 srv->Node.NumACLs = 1;
720 srv->Node.ACLs = &gVFS_ACL_EveryoneRW;
721 srv->Node.ReadDir = TCP_Server_ReadDir;
722 srv->Node.FindDir = TCP_Server_FindDir;
723 srv->Node.IOCtl = TCP_Server_IOCtl;
724 srv->Node.Close = TCP_Server_Close;
726 SHORTLOCK(&glTCP_Listeners);
727 srv->Next = gTCP_Listeners;
728 gTCP_Listeners = srv;
729 SHORTREL(&glTCP_Listeners);
735 * \brief Wait for a new connection and return the connection ID
736 * \note Blocks until a new connection is made
737 * \param Node Server node
738 * \param Pos Position (ignored)
740 char *TCP_Server_ReadDir(tVFS_Node *Node, int Pos)
742 tTCPListener *srv = Node->ImplPtr;
743 tTCPConnection *conn;
746 ENTER("pNode iPos", Node, Pos);
748 Log_Log("TCP", "Thread %i waiting for a connection", Threads_GetTID());
751 SHORTLOCK( &srv->lConnections );
752 if( srv->NewConnections != NULL ) break;
753 SHORTREL( &srv->lConnections );
754 Threads_Yield(); // TODO: Sleep until poked
759 // Increment the new list (the current connection is still on the
761 conn = srv->NewConnections;
762 srv->NewConnections = conn->Next;
764 SHORTREL( &srv->lConnections );
766 LOG("conn = %p", conn);
767 LOG("srv->Connections = %p", srv->Connections);
768 LOG("srv->NewConnections = %p", srv->NewConnections);
769 LOG("srv->ConnectionsTail = %p", srv->ConnectionsTail);
772 itoa(ret, conn->Node.ImplInt, 16, 8, '0');
773 Log_Log("TCP", "Thread %i got '%s'", Threads_GetTID(), ret);
779 * \brief Gets a client connection node
780 * \param Node Server node
781 * \param Name Hexadecimal ID of the node
783 tVFS_Node *TCP_Server_FindDir(tVFS_Node *Node, const char *Name)
785 tTCPConnection *conn;
786 tTCPListener *srv = Node->ImplPtr;
790 ENTER("pNode sName", Node, Name);
793 itoa(tmp, id, 16, 8, '0');
794 if(strcmp(tmp, Name) != 0) {
795 LOG("'%s' != '%s' (%08x)", Name, tmp, id);
800 Log_Debug("TCP", "srv->Connections = %p", srv->Connections);
801 Log_Debug("TCP", "srv->NewConnections = %p", srv->NewConnections);
802 Log_Debug("TCP", "srv->ConnectionsTail = %p", srv->ConnectionsTail);
805 SHORTLOCK( &srv->lConnections );
806 for(conn = srv->Connections;
810 LOG("conn->Node.ImplInt = %i", conn->Node.ImplInt);
811 if(conn->Node.ImplInt == id) break;
813 SHORTREL( &srv->lConnections );
815 // If not found, ret NULL
817 LOG("Connection %i not found", id);
823 LEAVE('p', &conn->Node);
828 * \brief Handle IOCtl calls
830 int TCP_Server_IOCtl(tVFS_Node *Node, int ID, void *Data)
832 tTCPListener *srv = Node->ImplPtr;
836 case 4: // Get/Set Port
837 if(!Data) // Get Port
840 if(srv->Port) // Wait, you can't CHANGE the port
843 if(!CheckMem(Data, sizeof(Uint16))) // Sanity check
847 if(Threads_GetUID() != 0
848 && *(Uint16*)Data != 0
849 && *(Uint16*)Data < 1024)
852 // TODO: Check if a port is in use
855 srv->Port = *(Uint16*)Data;
856 if(srv->Port == 0) // Allocate a random port
857 srv->Port = TCP_GetUnusedPort();
858 else // Else, mark this as used
859 TCP_AllocatePort(srv->Port);
861 Log_Log("TCP", "Server %p listening on port %i", srv, srv->Port);
868 void TCP_Server_Close(tVFS_Node *Node)
875 * \brief Create a client node
877 tVFS_Node *TCP_Client_Init(tInterface *Interface)
879 tTCPConnection *conn = malloc( sizeof(tTCPConnection) );
881 conn->State = TCP_ST_CLOSED;
882 conn->Interface = Interface;
883 conn->LocalPort = -1;
884 conn->RemotePort = -1;
885 memset( &conn->RemoteIP, 0, sizeof(conn->RemoteIP) );
887 conn->Node.ImplPtr = conn;
888 conn->Node.NumACLs = 1;
889 conn->Node.ACLs = &gVFS_ACL_EveryoneRW;
890 conn->Node.Read = TCP_Client_Read;
891 conn->Node.Write = TCP_Client_Write;
892 conn->Node.IOCtl = TCP_Client_IOCtl;
893 conn->Node.Close = TCP_Client_Close;
895 conn->RecievedBuffer = RingBuffer_Create( TCP_RECIEVE_BUFFER_SIZE );
897 SHORTLOCK(&glTCP_OutbountCons);
898 conn->Next = gTCP_OutbountCons;
899 gTCP_OutbountCons = conn;
900 SHORTREL(&glTCP_OutbountCons);
906 * \brief Wait for a packet and return it
907 * \note If \a Length is smaller than the size of the packet, the rest
908 * of the packet's data will be discarded.
910 Uint64 TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
912 tTCPConnection *conn = Node->ImplPtr;
915 ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
916 LOG("conn = %p {State:%i}", conn, conn->State);
918 // Check if connection is open
919 while( conn->State == TCP_ST_SYN_RCVD || conn->State == TCP_ST_SYN_SENT )
922 if( conn->State != TCP_ST_OPEN )
924 Mutex_Acquire( &conn->lRecievedPackets );
925 len = RingBuffer_Read( Buffer, conn->RecievedBuffer, Length );
926 Mutex_Release( &conn->lRecievedPackets );
929 VFS_MarkAvaliable(Node, 0);
939 VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "TCP_Client_Read");
941 // Lock list and read
942 Mutex_Acquire( &conn->lRecievedPackets );
944 // Attempt to read all `Length` bytes
945 len = RingBuffer_Read( Buffer, conn->RecievedBuffer, Length );
947 if( len == 0 || conn->RecievedBuffer->Length == 0 ) {
948 LOG("Marking as none avaliable (len = %i)", len);
949 VFS_MarkAvaliable(Node, 0);
952 // Release the lock (we don't need it any more)
953 Mutex_Release( &conn->lRecievedPackets );
960 * \brief Send a data packet on a connection
962 void TCP_INT_SendDataPacket(tTCPConnection *Connection, size_t Length, void *Data)
964 char buf[sizeof(tTCPHeader)+Length];
965 tTCPHeader *packet = (void*)buf;
967 packet->SourcePort = htons(Connection->LocalPort);
968 packet->DestPort = htons(Connection->RemotePort);
969 packet->DataOffset = (sizeof(tTCPHeader)/4)*16;
970 packet->WindowSize = TCP_WINDOW_SIZE;
972 packet->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
973 packet->SequenceNumber = htonl(Connection->NextSequenceSend);
974 packet->Flags = TCP_FLAG_PSH|TCP_FLAG_ACK; // Hey, ACK if you can!
976 memcpy(packet->Options, Data, Length);
978 Log_Debug("TCP", "Send sequence 0x%08x", Connection->NextSequenceSend);
979 Debug_HexDump("[TCP ] TCP_INT_SendDataPacket: Data = ",
982 TCP_SendPacket( Connection, sizeof(tTCPHeader)+Length, packet );
984 Connection->NextSequenceSend += Length;
988 * \brief Send some bytes on a connection
990 Uint64 TCP_Client_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
992 tTCPConnection *conn = Node->ImplPtr;
995 ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
997 // Check if connection is open
998 while( conn->State == TCP_ST_SYN_RCVD || conn->State == TCP_ST_SYN_SENT )
1001 if( conn->State != TCP_ST_OPEN ) {
1002 VFS_MarkError(Node, 1);
1007 while( rem > TCP_MAX_PACKET_SIZE )
1009 TCP_INT_SendDataPacket(conn, TCP_MAX_PACKET_SIZE, Buffer);
1010 Buffer += TCP_MAX_PACKET_SIZE;
1013 TCP_INT_SendDataPacket(conn, rem, Buffer);
1020 * \brief Open a connection to another host using TCP
1021 * \param Conn Connection structure
1023 void TCP_StartConnection(tTCPConnection *Conn)
1025 tTCPHeader hdr = {0};
1027 Conn->State = TCP_ST_SYN_SENT;
1029 hdr.SourcePort = htons(Conn->LocalPort);
1030 hdr.DestPort = htons(Conn->RemotePort);
1031 Conn->NextSequenceSend = rand();
1032 hdr.SequenceNumber = htonl(Conn->NextSequenceSend);
1033 hdr.DataOffset = (sizeof(tTCPHeader)/4) << 4;
1034 hdr.Flags = TCP_FLAG_SYN;
1035 hdr.WindowSize = htons(TCP_WINDOW_SIZE); // Max
1036 hdr.Checksum = 0; // TODO
1038 TCP_SendPacket( Conn, sizeof(tTCPHeader), &hdr );
1040 Conn->NextSequenceSend ++;
1041 Conn->State = TCP_ST_SYN_SENT;
1046 * \brief Control a client socket
1048 int TCP_Client_IOCtl(tVFS_Node *Node, int ID, void *Data)
1050 tTCPConnection *conn = Node->ImplPtr;
1052 ENTER("pNode iID pData", Node, ID, Data);
1056 case 4: // Get/Set local port
1058 LEAVE_RET('i', conn->LocalPort);
1059 if(conn->State != TCP_ST_CLOSED)
1061 if(!CheckMem(Data, sizeof(Uint16)))
1064 if(Threads_GetUID() != 0 && *(Uint16*)Data < 1024)
1067 conn->LocalPort = *(Uint16*)Data;
1068 LEAVE_RET('i', conn->LocalPort);
1070 case 5: // Get/Set remote port
1071 if(!Data) LEAVE_RET('i', conn->RemotePort);
1072 if(conn->State != TCP_ST_CLOSED) LEAVE_RET('i', -1);
1073 if(!CheckMem(Data, sizeof(Uint16))) LEAVE_RET('i', -1);
1074 conn->RemotePort = *(Uint16*)Data;
1075 LEAVE_RET('i', conn->RemotePort);
1077 case 6: // Set Remote IP
1078 if( conn->State != TCP_ST_CLOSED )
1080 if( conn->Interface->Type == 4 )
1082 if(!CheckMem(Data, sizeof(tIPv4))) LEAVE_RET('i', -1);
1083 conn->RemoteIP.v4 = *(tIPv4*)Data;
1085 else if( conn->Interface->Type == 6 )
1087 if(!CheckMem(Data, sizeof(tIPv6))) LEAVE_RET('i', -1);
1088 conn->RemoteIP.v6 = *(tIPv6*)Data;
1093 if(conn->LocalPort == 0xFFFF)
1094 conn->LocalPort = TCP_GetUnusedPort();
1095 if(conn->RemotePort == -1)
1098 TCP_StartConnection(conn);
1101 // Get recieve buffer length
1103 LEAVE_RET('i', conn->RecievedBuffer->Length);
1109 void TCP_Client_Close(tVFS_Node *Node)
1111 tTCPConnection *conn = Node->ImplPtr;
1114 ENTER("pNode", Node);
1116 if( conn->State == TCP_ST_CLOSE_WAIT || conn->State == TCP_ST_OPEN )
1118 packet.SourcePort = htons(conn->LocalPort);
1119 packet.DestPort = htons(conn->RemotePort);
1120 packet.DataOffset = (sizeof(tTCPHeader)/4)*16;
1121 packet.WindowSize = TCP_WINDOW_SIZE;
1123 packet.AcknowlegementNumber = 0;
1124 packet.SequenceNumber = htonl(conn->NextSequenceSend);
1125 packet.Flags = TCP_FLAG_FIN|TCP_FLAG_ACK;
1127 TCP_SendPacket( conn, sizeof(tTCPHeader), &packet );
1130 switch( conn->State )
1132 case TCP_ST_CLOSE_WAIT:
1133 conn->State = TCP_ST_CLOSED;
1136 conn->State = TCP_ST_FIN_WAIT1;
1137 while( conn->State == TCP_ST_FIN_WAIT1 ) Threads_Yield();
1140 Log_Warning("TCP", "Unhandled connection state in TCP_Client_Close");
1150 * \brief Checks if a value is between two others (after taking into account wrapping)
1152 int WrapBetween(Uint32 Lower, Uint32 Value, Uint32 Higher, Uint32 MaxValue)
1154 if( MaxValue < 0xFFFFFFFF )
1156 Lower %= MaxValue + 1;
1157 Value %= MaxValue + 1;
1158 Higher %= MaxValue + 1;
1161 // Simple Case, no wrap ?
1162 // Lower Value Higher
1163 // | ... + ... + ... + ... |
1165 if( Lower < Higher ) {
1166 return Lower < Value && Value < Higher;
1168 // Higher has wrapped below lower
1171 // Higher Lower Value
1172 // | ... + ... + ... + ... |
1173 if( Value > Lower ) {
1178 // Value Higher Lower
1179 // | ... + ... + ... + ... |
1180 if( Value < Higher ) {