Modules/IPStack/tcp.c

   1 /*
   2  * Acess2 IP Stack
   3  * - TCP Handling
   4  */
   5 #include "ipstack.h"
   6 #include "ipv4.h"
   7 #include "tcp.h"
   8
   9 #define TCP_MIN_DYNPORT 0xC000
  10 #define TCP_MAX_HALFOPEN        1024    // Should be enough
  11
  12 // === PROTOTYPES ===
  13 void    TCP_Initialise();
  14 void    TCP_StartConnection(tTCPConnection *Conn);
  15 void    TCP_SendPacket(tTCPConnection *Conn, size_t Length, tTCPHeader *Data);
  16 void    TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer);
  17 void    TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header, int Length);
  18 void    TCP_INT_AppendRecieved(tTCPConnection *Connection, tTCPStoredPacket *Ptk);
  19 void    TCP_INT_UpdateRecievedFromFuture(tTCPConnection *Connection);
  20 Uint16  TCP_GetUnusedPort();
  21  int    TCP_AllocatePort(Uint16 Port);
  22  int    TCP_DeallocatePort(Uint16 Port);
  23 // --- Server
  24 tVFS_Node       *TCP_Server_Init(tInterface *Interface);
  25 char    *TCP_Server_ReadDir(tVFS_Node *Node, int Pos);
  26 tVFS_Node       *TCP_Server_FindDir(tVFS_Node *Node, char *Name);
  27  int    TCP_Server_IOCtl(tVFS_Node *Node, int ID, void *Data);
  28 void    TCP_Server_Close(tVFS_Node *Node);
  29 // --- Client
  30 tVFS_Node       *TCP_Client_Init(tInterface *Interface);
  31 Uint64  TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  32 Uint64  TCP_Client_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  33  int    TCP_Client_IOCtl(tVFS_Node *Node, int ID, void *Data);
  34 void    TCP_Client_Close(tVFS_Node *Node);
  35
  36 // === TEMPLATES ===
  37 tSocketFile     gTCP_ServerFile = {NULL, "tcps", TCP_Server_Init};
  38 tSocketFile     gTCP_ClientFile = {NULL, "tcpc", TCP_Client_Init};
  39
  40 // === GLOBALS ===
  41  int    giTCP_NumHalfopen = 0;
  42 tSpinlock       glTCP_Listeners;
  43 tTCPListener    *gTCP_Listeners;
  44 tSpinlock       glTCP_OutbountCons;
  45 tTCPConnection  *gTCP_OutbountCons;
  46 Uint32  gaTCP_PortBitmap[0x800];
  47  int    giTCP_NextOutPort = TCP_MIN_DYNPORT;
  48
  49 // === CODE ===
  50 /**
  51  * \fn void TCP_Initialise()
  52  * \brief Initialise the TCP Layer
  53  */
  54 void TCP_Initialise()
  55 {
  56         IPStack_AddFile(&gTCP_ServerFile);
  57         IPStack_AddFile(&gTCP_ClientFile);
  58         IPv4_RegisterCallback(IP4PROT_TCP, TCP_GetPacket);
  59 }
  60
  61 /**
  62  * \brief Open a connection to another host using TCP
  63  */
  64 void TCP_StartConnection(tTCPConnection *Conn)
  65 {
  66         tTCPHeader      hdr;
  67
  68         hdr.SourcePort = Conn->LocalPort;
  69         hdr.DestPort = Conn->RemotePort;
  70         Conn->NextSequenceSend = rand();
  71         hdr.SequenceNumber = Conn->NextSequenceSend;
  72         hdr.DataOffset = (sizeof(tTCPHeader)+3)/4;
  73         hdr.Flags = TCP_FLAG_SYN;
  74         hdr.WindowSize = 0;     // TODO
  75         hdr.Checksum = 0;       // TODO
  76         hdr.UrgentPointer = 0;
  77         // SEND PACKET
  78         TCP_SendPacket( Conn, sizeof(tTCPHeader), &hdr );
  79         return ;
  80 }
  81
  82 /**
  83  * \brief Sends a packet from the specified connection, calculating the checksums
  84  * \param Conn  Connection
  85  * \param Length        Length of data
  86  * \param Data  Packet data
  87  */
  88 void TCP_SendPacket( tTCPConnection *Conn, size_t Length, tTCPHeader *Data )
  89 {
  90         size_t  buflen;
  91         Uint32  *buf;
  92         switch( Conn->Interface->Type )
  93         {
  94         case 4: // Append IPv4 Pseudo Header
  95                 buflen = 4 + 4 + 4 + ((Length+1)&1);
  96                 buf = malloc( buflen );
  97                 buf[0] = Conn->Interface->IP4.Address.L;
  98                 buf[1] = Conn->RemoteIP.v4.L;
  99                 buf[2] = (htons(Length)<<16) | (6<<8) | 0;
 100                 Data->Checksum = 0;
 101                 memcpy( &buf[3], Data, Length );
 102                 Data->Checksum = IPv4_Checksum( buf, buflen );
 103                 free(buf);
 104                 IPv4_SendPacket(Conn->Interface, Conn->RemoteIP.v4, IP4PROT_TCP, 0, buflen, buf);
 105                 break;
 106         }
 107 }
 108
 109 /**
 110  * \fn void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
 111  * \brief Handles a packet from the IP Layer
 112  */
 113 void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
 114 {
 115         tTCPHeader      *hdr = Buffer;
 116         tTCPListener    *srv;
 117         tTCPConnection  *conn;
 118
 119         Log("[TCP  ] sizeof(tTCPHeader) = %i", sizeof(tTCPHeader));
 120         Log("[TCP  ] SourcePort = %i", ntohs(hdr->SourcePort));
 121         Log("[TCP  ] DestPort = %i", ntohs(hdr->DestPort));
 122         Log("[TCP  ] SequenceNumber = 0x%x", ntohl(hdr->SequenceNumber));
 123         Log("[TCP  ] AcknowlegementNumber = 0x%x", ntohl(hdr->AcknowlegementNumber));
 124         Log("[TCP  ] DataOffset = %i", hdr->DataOffset >> 4);
 125         Log("[TCP  ] Flags = {");
 126         Log("[TCP  ]   CWR = %B", !!(hdr->Flags & TCP_FLAG_CWR));
 127         Log("[TCP  ]   ECE = %B", !!(hdr->Flags & TCP_FLAG_ECE));
 128         Log("[TCP  ]   URG = %B", !!(hdr->Flags & TCP_FLAG_URG));
 129         Log("[TCP  ]   ACK = %B", !!(hdr->Flags & TCP_FLAG_ACK));
 130         Log("[TCP  ]   PSH = %B", !!(hdr->Flags & TCP_FLAG_PSH));
 131         Log("[TCP  ]   RST = %B", !!(hdr->Flags & TCP_FLAG_RST));
 132         Log("[TCP  ]   SYN = %B", !!(hdr->Flags & TCP_FLAG_SYN));
 133         Log("[TCP  ]   FIN = %B", !!(hdr->Flags & TCP_FLAG_FIN));
 134         Log("[TCP  ] }");
 135         Log("[TCP  ] WindowSize = %i", htons(hdr->WindowSize));
 136         Log("[TCP  ] Checksum = 0x%x", htons(hdr->Checksum));
 137         Log("[TCP  ] UrgentPointer = 0x%x", htons(hdr->UrgentPointer));
 138
 139         // Check Servers
 140         {
 141                 for( srv = gTCP_Listeners; srv; srv = srv->Next )
 142                 {
 143                         // Check if the server is active
 144                         if(srv->Port == 0)      continue;
 145                         // Check the interface
 146                         if(srv->Interface && srv->Interface != Interface)       continue;
 147                         // Check the destination port
 148                         if(srv->Port != hdr->DestPort)  continue;
 149
 150                         // Is this in an established connection?
 151                         for( conn = srv->Connections; conn; conn = conn->Next )
 152                         {
 153                                 // Check that it is coming in on the same interface
 154                                 if(conn->Interface != Interface)        continue;
 155
 156                                 // Check Source Port
 157                                 if(conn->RemotePort != hdr->SourcePort) continue;
 158
 159                                 // Check Source IP
 160                                 if(conn->Interface->Type == 6 && !IP6_EQU(conn->RemoteIP.v6, *(tIPv6*)Address))
 161                                         continue;
 162                                 if(conn->Interface->Type == 4 && !IP4_EQU(conn->RemoteIP.v4, *(tIPv4*)Address))
 163                                         continue;
 164
 165                                 // We have a response!
 166                                 TCP_INT_HandleConnectionPacket(conn, hdr, Length);
 167
 168                                 return;
 169                         }
 170
 171                         // Open a new connection (well, check that it's a SYN)
 172                         if(hdr->Flags != TCP_FLAG_SYN) {
 173                                 Log("[TCP  ] Packet is not a SYN");
 174                                 continue;
 175                         }
 176
 177                         // TODO: Check for halfopen max
 178
 179                         conn = calloc(1, sizeof(tTCPConnection));
 180                         conn->State = TCP_ST_HALFOPEN;
 181                         conn->LocalPort = srv->Port;
 182                         conn->RemotePort = hdr->SourcePort;
 183                         conn->Interface = Interface;
 184
 185                         switch(Interface->Type)
 186                         {
 187                         case 4: conn->RemoteIP.v4 = *(tIPv4*)Address;   break;
 188                         case 6: conn->RemoteIP.v6 = *(tIPv6*)Address;   break;
 189                         }
 190
 191                         conn->NextSequenceRcv = ntohl( hdr->SequenceNumber );
 192                         conn->NextSequenceSend = rand();
 193
 194                         // Create node
 195                         conn->Node.NumACLs = 1;
 196                         conn->Node.ACLs = &gVFS_ACL_EveryoneRW;
 197                         conn->Node.ImplInt = srv->NextID ++;
 198                         conn->Node.Read = TCP_Client_Read;
 199                         conn->Node.Write = TCP_Client_Write;
 200                         //conn->Node.Close = TCP_SrvConn_Close;
 201
 202                         // Hmm... Theoretically, this lock will never have to wait,
 203                         // as the interface is locked to the watching thread, and this
 204                         // runs in the watching thread. But, it's a good idea to have
 205                         // it, just in case
 206                         LOCK(&srv->lConnections);
 207                         conn->Next = srv->Connections;
 208                         srv->Connections = conn;
 209                         RELEASE(&srv->lConnections);
 210
 211                         // Send the SYN ACK
 212                         Log("[TCP  ] TODO: Sending SYN ACK");
 213                         hdr->Flags |= TCP_FLAG_ACK;
 214                         hdr->AcknowlegementNumber = hdr->SequenceNumber;
 215                         hdr->SequenceNumber = conn->NextSequenceSend;
 216                         hdr->DestPort = hdr->SourcePort;
 217                         hdr->SourcePort = srv->Port;
 218                         TCP_SendPacket( conn, sizeof(tTCPHeader), hdr );
 219
 220                         break;
 221                 }
 222         }
 223
 224
 225         // Check Open Connections
 226         {
 227                 for( conn = gTCP_OutbountCons; conn; conn = conn->Next )
 228                 {
 229                         // Check that it is coming in on the same interface
 230                         if(conn->Interface != Interface)        continue;
 231
 232                         // Check Source Port
 233                         if(conn->RemotePort != hdr->SourcePort) continue;
 234
 235                         // Check Source IP
 236                         if(conn->Interface->Type == 6 && !IP6_EQU(conn->RemoteIP.v6, *(tIPv6*)Address))
 237                                 continue;
 238                         if(conn->Interface->Type == 4 && !IP4_EQU(conn->RemoteIP.v4, *(tIPv4*)Address))
 239                                 continue;
 240
 241                         TCP_INT_HandleConnectionPacket(conn, hdr, Length);
 242                 }
 243         }
 244 }
 245
 246 /**
 247  * \brief Handles a packet sent to a specific connection
 248  */
 249 void TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header, int Length)
 250 {
 251         tTCPStoredPacket        *pkt;
 252          int    dataLen;
 253
 254         Connection->State = TCP_ST_OPEN;
 255         if(Header->Flags & TCP_FLAG_SYN) {
 256                 Connection->NextSequenceRcv = Header->SequenceNumber + 1;
 257         }
 258
 259         if(Header->Flags & TCP_FLAG_ACK) {
 260                 // TODO: Process an ACKed Packet
 261                 Log("[TCP  ] Conn %p, Packet 0x%x ACKed", Connection, Header->AcknowlegementNumber);
 262                 return ;
 263         }
 264
 265         // Allocate and fill cached packet
 266         dataLen =  Length - (Header->DataOffset&0xF)*4;
 267         pkt = malloc( dataLen + sizeof(tTCPStoredPacket) );
 268         pkt->Next = NULL;
 269         pkt->Sequence = Header->SequenceNumber;
 270         memcpy(pkt->Data, (Uint8*)Header + (Header->DataOffset&0xF)*4, dataLen);
 271
 272         // Is this packet the next expected packet?
 273         if( Header->SequenceNumber != Connection->NextSequenceRcv )
 274         {
 275                 tTCPStoredPacket        *tmp, *prev;
 276                 // No? Well, let's cache it and look at it later
 277                 LOCK( &Connection->lFuturePackets );
 278                 for(tmp = Connection->FuturePackets;
 279                         tmp;
 280                         prev = tmp, tmp = tmp->Next)
 281                 {
 282                         if(tmp->Sequence > pkt->Sequence)       break;
 283                 }
 284                 if(prev)
 285                         prev->Next = pkt;
 286                 else
 287                         Connection->FuturePackets = pkt;
 288                 pkt->Next = tmp;
 289                 RELEASE( &Connection->lFuturePackets );
 290         }
 291         else
 292         {
 293                 // Ooh, Goodie! Add it to the recieved list
 294                 TCP_INT_AppendRecieved(Connection, pkt);
 295                 Connection->NextSequenceRcv ++;
 296
 297                 // TODO: This should be moved out of the watcher thread,
 298                 // so that a single lost packet on one connection doesn't cause
 299                 // all connections on the interface to lag.
 300                 TCP_INT_UpdateRecievedFromFuture(Connection);
 301         }
 302
 303         // TODO: Check ACK code validity
 304         Header->AcknowlegementNumber = pkt->Sequence;
 305         Header->SequenceNumber = Connection->NextSequenceSend;
 306         Header->Flags |= TCP_FLAG_ACK;
 307         TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
 308 }
 309
 310 /**
 311  * \brief Appends a packet to the recieved list
 312  */
 313 void TCP_INT_AppendRecieved(tTCPConnection *Connection, tTCPStoredPacket *Pkt)
 314 {
 315         LOCK( &Connection->lRecievedPackets );
 316         if(Connection->RecievedPackets)
 317         {
 318                 Connection->RecievedPacketsTail->Next = Pkt;
 319                 Connection->RecievedPacketsTail = Pkt;
 320         }
 321         else
 322         {
 323                 Connection->RecievedPackets = Pkt;
 324                 Connection->RecievedPacketsTail = Pkt;
 325         }
 326         RELEASE( &Connection->lRecievedPackets );
 327 }
 328
 329 /**
 330  * \brief Updates the connections recieved list from the future list
 331  */
 332 void TCP_INT_UpdateRecievedFromFuture(tTCPConnection *Connection)
 333 {
 334         tTCPStoredPacket        *pkt, *prev;
 335         for(;;)
 336         {
 337                 prev = NULL;
 338                 // Look for the next expected packet in the cache.
 339                 LOCK( &Connection->lFuturePackets );
 340                 for(pkt = Connection->FuturePackets;
 341                         pkt && pkt->Sequence < Connection->NextSequenceRcv;
 342                         prev = pkt, pkt = pkt->Next);
 343
 344                 // If we can't find the expected next packet, stop looking
 345                 if(!pkt || pkt->Sequence > Connection->NextSequenceRcv) {
 346                         RELEASE( &Connection->lFuturePackets );
 347                         return;
 348                 }
 349
 350                 // Delete packet from future list
 351                 if(prev)
 352                         prev->Next = pkt->Next;
 353                 else
 354                         Connection->FuturePackets = pkt->Next;
 355
 356                 // Release list
 357                 RELEASE( &Connection->lFuturePackets );
 358
 359                 // Looks like we found one
 360                 TCP_INT_AppendRecieved(Connection, pkt);
 361                 Connection->NextSequenceRcv ++;
 362         }
 363 }
 364
 365 /**
 366  * \fn Uint16 TCP_GetUnusedPort()
 367  * \brief Gets an unused port and allocates it
 368  */
 369 Uint16 TCP_GetUnusedPort()
 370 {
 371         Uint16  ret;
 372
 373         // Get Next outbound port
 374         ret = giTCP_NextOutPort++;
 375         while( gaTCP_PortBitmap[ret/32] & (1 << (ret%32)) )
 376         {
 377                 ret ++;
 378                 giTCP_NextOutPort++;
 379                 if(giTCP_NextOutPort == 0x10000) {
 380                         ret = giTCP_NextOutPort = TCP_MIN_DYNPORT;
 381                 }
 382         }
 383
 384         // Mark the new port as used
 385         gaTCP_PortBitmap[ret/32] |= 1 << (ret%32);
 386
 387         return ret;
 388 }
 389
 390 /**
 391  * \fn int TCP_AllocatePort(Uint16 Port)
 392  * \brief Marks a port as used
 393  */
 394 int TCP_AllocatePort(Uint16 Port)
 395 {
 396         // Check if the port has already been allocated
 397         if( gaTCP_PortBitmap[Port/32] & (1 << (Port%32)) )
 398                 return 0;
 399
 400         // Allocate
 401         gaTCP_PortBitmap[Port/32] |= 1 << (Port%32);
 402
 403         return 1;
 404 }
 405
 406 /**
 407  * \fn int TCP_DeallocatePort(Uint16 Port)
 408  * \brief Marks a port as unused
 409  */
 410 int TCP_DeallocatePort(Uint16 Port)
 411 {
 412         // Check if the port has already been allocated
 413         if( !(gaTCP_PortBitmap[Port/32] & (1 << (Port%32))) )
 414                 return 0;
 415
 416         // Allocate
 417         gaTCP_PortBitmap[Port/32] &= ~(1 << (Port%32));
 418
 419         return 1;
 420 }
 421
 422 // --- Server
 423 tVFS_Node *TCP_Server_Init(tInterface *Interface)
 424 {
 425         tTCPListener    *srv = malloc( sizeof(tTCPListener) );
 426
 427         srv->Interface = Interface;
 428         srv->Port = 0;
 429         srv->NextID = 0;
 430         srv->Connections = NULL;
 431         srv->Next = NULL;
 432         srv->Node.ImplPtr = srv;
 433         srv->Node.NumACLs = 1;
 434         srv->Node.ACLs = &gVFS_ACL_EveryoneRW;
 435         srv->Node.ReadDir = TCP_Server_ReadDir;
 436         srv->Node.FindDir = TCP_Server_FindDir;
 437         srv->Node.IOCtl = TCP_Server_IOCtl;
 438         srv->Node.Close = TCP_Server_Close;
 439
 440         LOCK(&glTCP_Listeners);
 441         srv->Next = gTCP_Listeners;
 442         gTCP_Listeners = srv;
 443         RELEASE(&glTCP_Listeners);
 444
 445         return &srv->Node;
 446 }
 447
 448 /**
 449  * \brief Wait for a new connection and return the connection ID
 450  * \note Blocks until a new connection is made
 451  * \param Node  Server node
 452  * \param Pos   Position (ignored)
 453  */
 454 char *TCP_Server_ReadDir(tVFS_Node *Node, int Pos)
 455 {
 456         tTCPListener    *srv = Node->ImplPtr;
 457         tTCPConnection  *conn;
 458         char    *ret;
 459
 460         while( srv->NewConnections == NULL )    Threads_Yield();
 461
 462         conn = srv->NewConnections;
 463         srv->NewConnections = conn->Next;
 464
 465         ret = malloc(9);
 466         itoa(ret, Node->ImplInt, 16, '0', 8);
 467         return ret;
 468 }
 469
 470 /**
 471  * \brief Gets a client connection node
 472  * \param Node  Server node
 473  * \param Name  Hexadecimal ID of the node
 474  */
 475 tVFS_Node *TCP_Server_FindDir(tVFS_Node *Node, char *Name)
 476 {
 477         return NULL;
 478 }
 479
 480 int TCP_Server_IOCtl(tVFS_Node *Node, int ID, void *Data)
 481 {
 482         tTCPListener    *srv = Node->ImplPtr;
 483
 484         switch(ID)
 485         {
 486         case 4: // Get/Set Port
 487                 if(!Data)       // Get Port
 488                         return srv->Port;
 489
 490                 if(srv->Port)   // Wait, you can't CHANGE the port
 491                         return -1;
 492
 493                 if(!CheckMem(Data, sizeof(Uint16)))     // Sanity check
 494                         return -1;
 495
 496                 // Permissions check
 497                 if(Threads_GetUID() != 0
 498                 && *(Uint16*)Data != 0
 499                 && *(Uint16*)Data < 1024)
 500                         return -1;
 501
 502                 // TODO: Check if a port is in use
 503
 504                 // Set Port
 505                 srv->Port = *(Uint16*)Data;
 506                 if(srv->Port == 0)      // Allocate a random port
 507                         srv->Port = TCP_GetUnusedPort();
 508                 else    // Else, mark this as used
 509                         TCP_AllocatePort(srv->Port);
 510                 return srv->Port;
 511         }
 512         return 0;
 513 }
 514
 515 void TCP_Server_Close(tVFS_Node *Node)
 516 {
 517         free(Node->ImplPtr);
 518 }
 519
 520 // --- Client
 521 /**
 522  * \brief Create a client node
 523  */
 524 tVFS_Node *TCP_Client_Init(tInterface *Interface)
 525 {
 526         tTCPConnection  *conn = malloc( sizeof(tTCPConnection) );
 527
 528         conn->State = TCP_ST_CLOSED;
 529         conn->Interface = Interface;
 530         conn->LocalPort = 0;
 531         conn->RemotePort = 0;
 532         memset( &conn->RemoteIP, 0, sizeof(conn->RemoteIP) );
 533
 534         conn->Node.ImplPtr = conn;
 535         conn->Node.NumACLs = 1;
 536         conn->Node.ACLs = &gVFS_ACL_EveryoneRW;
 537         conn->Node.Read = TCP_Client_Read;
 538         conn->Node.Write = TCP_Client_Write;
 539         conn->Node.IOCtl = TCP_Client_IOCtl;
 540         conn->Node.Close = TCP_Client_Close;
 541
 542         LOCK(&glTCP_OutbountCons);
 543         conn->Next = gTCP_OutbountCons;
 544         gTCP_OutbountCons = conn;
 545         RELEASE(&glTCP_OutbountCons);
 546
 547         return &conn->Node;
 548 }
 549
 550 /**
 551  * \brief Wait for a packet and return it
 552  * \note If \a Length is smaller than the size of the packet, the rest
 553  *       of the packet's data will be discarded.
 554  */
 555 Uint64 TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 556 {
 557         tTCPConnection  *conn = Node->ImplPtr;
 558         tTCPStoredPacket        *pkt;
 559
 560         // Check if connection is open
 561         if( conn->State != TCP_ST_OPEN )        return 0;
 562
 563         // Poll packets
 564         for(;;)
 565         {
 566                 // Sleep until the packet is recieved
 567                 while( conn->RecievedPackets == NULL )
 568                         Threads_Yield();
 569                 //      Threads_Sleep();
 570
 571                 // Lock list and check if there is a packet
 572                 LOCK( &conn->lRecievedPackets );
 573                 if( conn->RecievedPackets == NULL ) {
 574                         // If not, release the lock and return to waiting
 575                         RELEASE( &conn->lRecievedPackets );
 576                         continue;
 577                 }
 578
 579                 // Get packet pointer
 580                 pkt = conn->RecievedPackets;
 581                 conn->RecievedPackets = pkt->Next;
 582                 // Release the lock (we don't need it any more)
 583                 RELEASE( &conn->lRecievedPackets );
 584
 585                 // Copy Data
 586                 if(Length > pkt->Length)        Length = pkt->Length;
 587                 memcpy(Buffer, pkt->Data, Length);
 588
 589                 // Free packet and return
 590                 free(pkt);
 591                 return Length;
 592         }
 593 }
 594
 595 Uint64 TCP_Client_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 596 {
 597         return 0;
 598 }
 599
 600 /**
 601  * \brief Control a client socket
 602  */
 603 int TCP_Client_IOCtl(tVFS_Node *Node, int ID, void *Data)
 604 {
 605         tTCPConnection  *conn = Node->ImplPtr;
 606
 607         switch(ID)
 608         {
 609         case 4: // Get/Set local port
 610                 if(!Data)
 611                         return conn->LocalPort;
 612                 if(conn->State != TCP_ST_CLOSED)
 613                         return -1;
 614                 if(!CheckMem(Data, sizeof(Uint16)))
 615                         return -1;
 616
 617                 if(Threads_GetUID() != 0 && *(Uint16*)Data < 1024)
 618                         return -1;
 619
 620                 conn->LocalPort = *(Uint16*)Data;
 621                 return 0;
 622
 623         case 5: // Get/Set remote port
 624                 if(!Data)       return conn->RemotePort;
 625                 if(conn->State != TCP_ST_CLOSED)        return -1;
 626                 if(!CheckMem(Data, sizeof(Uint16)))     return -1;
 627                 conn->RemotePort = *(Uint16*)Data;
 628                 return 0;
 629
 630         case 6: // Set Remote IP
 631                 if( conn->State != TCP_ST_CLOSED )
 632                         return -1;
 633                 if( conn->Interface->Type == 4 )
 634                 {
 635                         if(!CheckMem(Data, sizeof(tIPv4)))      return -1;
 636                         conn->RemoteIP.v4 = *(tIPv4*)Data;
 637                 }
 638                 else if( conn->Interface->Type == 6 )
 639                 {
 640                         if(!CheckMem(Data, sizeof(tIPv6)))      return -1;
 641                         conn->RemoteIP.v6 = *(tIPv6*)Data;
 642                 }
 643                 return 0;
 644
 645         case 7: // Connect
 646                 if(conn->LocalPort == -1)
 647                         conn->LocalPort = TCP_GetUnusedPort();
 648                 if(conn->RemotePort == -1)
 649                         return 0;
 650
 651                 TCP_StartConnection(conn);
 652                 return 1;
 653         }
 654
 655         return 0;
 656 }
 657
 658 void TCP_Client_Close(tVFS_Node *Node)
 659 {
 660         free(Node->ImplPtr);
 661 }