9 #define TCP_MIN_DYNPORT 0x1000
10 #define TCP_MAX_HALFOPEN 1024 // Should be enough
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);
18 Uint16 TCP_GetUnusedPort();
19 int TCP_AllocatePort(Uint16 Port);
20 int TCP_DeallocatePort(Uint16 Port);
22 tVFS_Node *TCP_Server_Init(tInterface *Interface);
23 char *TCP_Server_ReadDir(tVFS_Node *Node, int Pos);
24 tVFS_Node *TCP_Server_FindDir(tVFS_Node *Node, char *Name);
25 int TCP_Server_IOCtl(tVFS_Node *Node, int ID, void *Data);
26 void TCP_Server_Close(tVFS_Node *Node);
28 tVFS_Node *TCP_Client_Init(tInterface *Interface);
29 Uint64 TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
30 Uint64 TCP_Client_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
31 int TCP_Client_IOCtl(tVFS_Node *Node, int ID, void *Data);
32 void TCP_Client_Close(tVFS_Node *Node);
35 tSocketFile gTCP_ServerFile = {NULL, "tcps", TCP_Server_Init};
36 tSocketFile gTCP_ClientFile = {NULL, "tcpc", TCP_Client_Init};
39 int giTCP_NumHalfopen = 0;
40 tSpinlock glTCP_Listeners;
41 tTCPListener *gTCP_Listeners;
42 tSpinlock glTCP_OutbountCons;
43 tTCPConnection *gTCP_OutbountCons;
44 Uint32 gaTCP_PortBitmap[0x800];
45 int giTCP_NextOutPort = TCP_MIN_DYNPORT;
49 * \fn void TCP_Initialise()
50 * \brief Initialise the TCP Layer
54 IPStack_AddFile(&gTCP_ServerFile);
55 IPStack_AddFile(&gTCP_ClientFile);
56 IPv4_RegisterCallback(IP4PROT_TCP, TCP_GetPacket);
60 * \brief Open a connection to another host using TCP
62 void TCP_StartConnection(tTCPConnection *Conn)
66 hdr.SourcePort = Conn->LocalPort;
67 hdr.DestPort = Conn->RemotePort;
68 Conn->NextSequenceSend = rand();
69 hdr.SequenceNumber = Conn->NextSequenceSend;
70 hdr.DataOffset = (sizeof(tTCPHeader)+3)/4;
71 hdr.Flags = TCP_FLAG_SYN;
72 hdr.WindowSize = 0; // TODO
73 hdr.Checksum = 0; // TODO
74 hdr.UrgentPointer = 0;
76 TCP_SendPacket( Conn, sizeof(tTCPHeader), &hdr );
81 * \brief Sends a packet from the specified connection, calculating the checksums
82 * \param Conn Connection
83 * \param Length Length of data
84 * \param Data Packet data
86 void TCP_SendPacket( tTCPConnection *Conn, size_t Length, tTCPHeader *Data )
90 switch( Conn->Interface->Type )
92 case 4: // Append IPv4 Pseudo Header
93 buflen = 4 + 4 + 4 + ((Length+1)&1);
94 buf = malloc( buflen );
95 buf[0] = Conn->Interface->IP4.Address.L;
96 buf[1] = Conn->RemoteIP.v4.L;
97 buf[2] = (htons(Length)<<16) | (6<<8) | 0;
99 memcpy( &buf[3], Data, Length );
100 Data->Checksum = IPv4_Checksum( buf, buflen );
102 IPv4_SendPacket(Conn->Interface, Conn->RemoteIP.v4, IP4PROT_TCP, 0, buflen, buf);
108 * \fn void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
109 * \brief Handles a packet from the IP Layer
111 void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
113 tTCPHeader *hdr = Buffer;
115 tTCPConnection *conn;
117 Log("[TCP ] sizeof(tTCPHeader) = %i", sizeof(tTCPHeader));
118 Log("[TCP ] SourcePort = %i", ntohs(hdr->SourcePort));
119 Log("[TCP ] DestPort = %i", ntohs(hdr->DestPort));
120 Log("[TCP ] SequenceNumber = 0x%x", ntohl(hdr->SequenceNumber));
121 Log("[TCP ] AcknowlegementNumber = 0x%x", ntohl(hdr->AcknowlegementNumber));
122 Log("[TCP ] DataOffset = %i", hdr->DataOffset >> 4);
123 Log("[TCP ] Flags = {");
124 Log("[TCP ] CWR = %B", !!(hdr->Flags & TCP_FLAG_CWR));
125 Log("[TCP ] ECE = %B", !!(hdr->Flags & TCP_FLAG_ECE));
126 Log("[TCP ] URG = %B", !!(hdr->Flags & TCP_FLAG_URG));
127 Log("[TCP ] ACK = %B", !!(hdr->Flags & TCP_FLAG_ACK));
128 Log("[TCP ] PSH = %B", !!(hdr->Flags & TCP_FLAG_PSH));
129 Log("[TCP ] RST = %B", !!(hdr->Flags & TCP_FLAG_RST));
130 Log("[TCP ] SYN = %B", !!(hdr->Flags & TCP_FLAG_SYN));
131 Log("[TCP ] FIN = %B", !!(hdr->Flags & TCP_FLAG_FIN));
133 Log("[TCP ] WindowSize = %i", htons(hdr->WindowSize));
134 Log("[TCP ] Checksum = 0x%x", htons(hdr->Checksum));
135 Log("[TCP ] UrgentPointer = 0x%x", htons(hdr->UrgentPointer));
139 for( srv = gTCP_Listeners; srv; srv = srv->Next )
141 // Check if the server is active
142 if(srv->Port == 0) continue;
143 // Check the interface
144 if(srv->Interface && srv->Interface != Interface) continue;
145 // Check the destination port
146 if(srv->Port != hdr->DestPort) continue;
148 // Is this in an established connection?
149 for( conn = srv->Connections; conn; conn = conn->Next )
151 // Check that it is coming in on the same interface
152 if(conn->Interface != Interface) continue;
155 if(conn->RemotePort != hdr->SourcePort) continue;
158 if(conn->Interface->Type == 6 && !IP6_EQU(conn->RemoteIP.v6, *(tIPv6*)Address))
160 if(conn->Interface->Type == 4 && !IP4_EQU(conn->RemoteIP.v4, *(tIPv4*)Address))
163 // We have a response!
164 TCP_INT_HandleConnectionPacket(conn, hdr);
169 // Open a new connection (well, check that it's a SYN)
170 if(hdr->Flags != TCP_FLAG_SYN) {
171 Log("[TCP ] Packet is not a SYN");
175 conn = calloc(1, sizeof(tTCPConnection));
176 conn->State = TCP_ST_HALFOPEN;
177 conn->LocalPort = srv->Port;
178 conn->RemotePort = hdr->SourcePort;
179 conn->Interface = Interface;
181 switch(Interface->Type)
183 case 4: conn->RemoteIP.v4 = *(tIPv4*)Address; break;
184 case 6: conn->RemoteIP.v6 = *(tIPv6*)Address; break;
187 conn->NextSequenceRcv = ntohl( hdr->SequenceNumber );
188 conn->NextSequenceSend = rand();
191 conn->Node.NumACLs = 1;
192 conn->Node.ACLs = &gVFS_ACL_EveryoneRW;
193 conn->Node.ImplInt = srv->NextID ++;
194 conn->Node.Read = TCP_Client_Read;
195 conn->Node.Write = TCP_Client_Write;
196 //conn->Node.Close = TCP_SrvConn_Close;
198 // Hmm... Theoretically, this lock will never have to wait,
199 // as the interface is locked to the watching thread, and this
200 // runs in the watching thread. But, it's a good idea to have
202 LOCK(&srv->lConnections);
203 conn->Next = srv->Connections;
204 srv->Connections = conn;
205 RELEASE(&srv->lConnections);
208 Log("[TCP ] TODO: Sending SYN ACK");
209 hdr->Flags |= TCP_FLAG_ACK;
210 hdr->AcknowlegementNumber = hdr->SequenceNumber;
211 hdr->SequenceNumber = conn->NextSequenceSend;
212 hdr->DestPort = hdr->SourcePort;
213 hdr->SourcePort = srv->Port;
214 TCP_SendPacket( conn, sizeof(tTCPHeader), hdr );
221 // Check Open Connections
223 for( conn = gTCP_OutbountCons; conn; conn = conn->Next )
225 // Check that it is coming in on the same interface
226 if(conn->Interface != Interface) continue;
229 if(conn->RemotePort != hdr->SourcePort) continue;
232 if(conn->Interface->Type == 6 && !IP6_EQU(conn->RemoteIP.v6, *(tIPv6*)Address))
234 if(conn->Interface->Type == 4 && !IP4_EQU(conn->RemoteIP.v4, *(tIPv4*)Address))
237 TCP_INT_HandleConnectionPacket(conn, hdr);
243 * \brief Handles a packet sent to a specific connection
245 void TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header)
251 * \fn Uint16 TCP_GetUnusedPort()
252 * \brief Gets an unused port and allocates it
254 Uint16 TCP_GetUnusedPort()
258 // Get Next outbound port
259 ret = giTCP_NextOutPort++;
260 while( gaTCP_PortBitmap[ret/32] & (1 << (ret%32)) )
264 if(giTCP_NextOutPort == 0x10000) {
265 ret = giTCP_NextOutPort = TCP_MIN_DYNPORT;
269 // Mark the new port as used
270 gaTCP_PortBitmap[ret/32] |= 1 << (ret%32);
276 * \fn int TCP_AllocatePort(Uint16 Port)
277 * \brief Marks a port as used
279 int TCP_AllocatePort(Uint16 Port)
281 // Check if the port has already been allocated
282 if( gaTCP_PortBitmap[Port/32] & (1 << (Port%32)) )
286 gaTCP_PortBitmap[Port/32] |= 1 << (Port%32);
292 * \fn int TCP_DeallocatePort(Uint16 Port)
293 * \brief Marks a port as unused
295 int TCP_DeallocatePort(Uint16 Port)
297 // Check if the port has already been allocated
298 if( !(gaTCP_PortBitmap[Port/32] & (1 << (Port%32))) )
302 gaTCP_PortBitmap[Port/32] &= ~(1 << (Port%32));
308 tVFS_Node *TCP_Server_Init(tInterface *Interface)
310 tTCPListener *srv = malloc( sizeof(tTCPListener) );
312 srv->Interface = Interface;
315 srv->Connections = NULL;
317 srv->Node.ImplPtr = srv;
318 srv->Node.NumACLs = 1;
319 srv->Node.ACLs = &gVFS_ACL_EveryoneRW;
320 srv->Node.ReadDir = TCP_Server_ReadDir;
321 srv->Node.FindDir = TCP_Server_FindDir;
322 srv->Node.IOCtl = TCP_Server_IOCtl;
323 srv->Node.Close = TCP_Server_Close;
325 LOCK(&glTCP_Listeners);
326 srv->Next = gTCP_Listeners;
327 gTCP_Listeners = srv;
328 RELEASE(&glTCP_Listeners);
334 * \brief Wait for a new connection and return the connection ID
335 * \note Blocks until a new connection is made
336 * \param Node Server node
337 * \param Pos Position (ignored)
339 char *TCP_Server_ReadDir(tVFS_Node *Node, int Pos)
341 tTCPListener *srv = Node->ImplPtr;
342 tTCPConnection *conn;
345 while( srv->NewConnections == NULL ) Threads_Yield();
347 conn = srv->NewConnections;
348 srv->NewConnections = conn->Next;
351 itoa(ret, Node->ImplInt, 16, '0', 8);
356 * \brief Gets a client connection node
357 * \param Node Server node
358 * \param Name Hexadecimal ID of the node
360 tVFS_Node *TCP_Server_FindDir(tVFS_Node *Node, char *Name)
365 int TCP_Server_IOCtl(tVFS_Node *Node, int ID, void *Data)
367 tTCPListener *srv = Node->ImplPtr;
371 case 4: // Get/Set Port
372 if(!Data) // Get Port
375 if(srv->Port) // Wait, you can't CHANGE the port
378 if(!CheckMem(Data, sizeof(Uint16))) // Sanity check
382 if(Threads_GetUID() != 0
383 && *(Uint16*)Data != 0
384 && *(Uint16*)Data < 1024)
387 // TODO: Check if a port is in use
390 srv->Port = *(Uint16*)Data;
391 if(srv->Port == 0) // Allocate a random port
392 srv->Port = TCP_GetUnusedPort();
393 else // Else, mark this as used
394 TCP_AllocatePort(srv->Port);
400 void TCP_Server_Close(tVFS_Node *Node)
406 tVFS_Node *TCP_Client_Init(tInterface *Interface)
408 tTCPConnection *conn = malloc( sizeof(tTCPConnection) );
410 conn->State = TCP_ST_CLOSED;
411 conn->Interface = Interface;
413 conn->RemotePort = 0;
414 memset( &conn->RemoteIP, 0, sizeof(conn->RemoteIP) );
416 conn->Node.ImplPtr = conn;
417 conn->Node.NumACLs = 1;
418 conn->Node.ACLs = &gVFS_ACL_EveryoneRW;
419 conn->Node.Read = TCP_Client_Read;
420 conn->Node.Write = TCP_Client_Write;
421 conn->Node.IOCtl = TCP_Client_IOCtl;
422 conn->Node.Close = TCP_Client_Close;
424 LOCK(&glTCP_OutbountCons);
425 conn->Next = gTCP_OutbountCons;
426 gTCP_OutbountCons = conn;
427 RELEASE(&glTCP_OutbountCons);
432 Uint64 TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
437 Uint64 TCP_Client_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
443 * \brief Control a client socket
445 int TCP_Client_IOCtl(tVFS_Node *Node, int ID, void *Data)
447 tTCPConnection *conn = Node->ImplPtr;
451 case 4: // Get/Set local port
453 return conn->LocalPort;
454 if(conn->State != TCP_ST_CLOSED)
456 if(!CheckMem(Data, sizeof(Uint16)))
459 if(Threads_GetUID() != 0 && *(Uint16*)Data < 1024)
462 conn->LocalPort = *(Uint16*)Data;
465 case 5: // Get/Set remote port
466 if(!Data) return conn->RemotePort;
467 if(conn->State != TCP_ST_CLOSED) return -1;
468 if(!CheckMem(Data, sizeof(Uint16))) return -1;
469 conn->RemotePort = *(Uint16*)Data;
472 case 6: // Set Remote IP
473 if( conn->State != TCP_ST_CLOSED )
475 if( conn->Interface->Type == 4 )
477 if(!CheckMem(Data, sizeof(tIPv4))) return -1;
478 conn->RemoteIP.v4 = *(tIPv4*)Data;
480 else if( conn->Interface->Type == 6 )
482 if(!CheckMem(Data, sizeof(tIPv6))) return -1;
483 conn->RemoteIP.v6 = *(tIPv6*)Data;
488 if(conn->LocalPort == -1)
489 conn->LocalPort = TCP_GetUnusedPort();
490 if(conn->RemotePort == -1)
493 TCP_StartConnection(conn);
500 void TCP_Client_Close(tVFS_Node *Node)