* Acess2 IP Stack
* - TCP Handling
*/
+#define DEBUG 1
#include "ipstack.h"
+#include "ipv4.h"
#include "tcp.h"
-#define TCP_MIN_DYNPORT 0x1000
+#define USE_SELECT 1
+
+#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_Open(tInterface *Interface, Uint16 LocalPort, void *Address, Uint16 Port);
-void TCP_GetPacket(tInterface *Interface, int Length, void *Buffer);
+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);
+// --- Helpers
+ int WrapBetween(Uint32 Lower, Uint32 Value, Uint32 Higher, Uint32 MaxValue);
+
+// === 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 ===
/**
- * \fn void TCP_Initialise()
* \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);
}
/**
- * \fn void *TCP_Open(tInterface *Interface, Uint16 LocalPort, void *Address, Uint16 Port)
- * \brief Open a connection to another host using TCP
+ * \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_Open(tInterface *Interface, Uint16 LocalPort, void *Address, Uint16 Port)
+void TCP_SendPacket( tTCPConnection *Conn, size_t Length, tTCPHeader *Data )
{
- tTCPConnection *ret = malloc( sizeof(tTCPConnection) );
-
- ret->State = TCP_ST_CLOSED;
- if(LocalPort == 0)
- ret->LocalPort = TCP_GetUnusedPort();
- else
- ret->LocalPort = LocalPort;
- ret->RemotePort = Port;
-
- ret->LocalInterface = Interface;
-
- if(Interface->Type == 6)
- ret->RemoteIP.v6 = *(tIPv6*)Address;
- else
- ret->RemoteIP.v4 = *(tIPv4*)Address;
-
- // SEND PACKET
-
- return ret;
+ 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;
+ }
}
/**
- * \fn void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
* \brief Handles a packet from the IP Layer
+ * \param Interface Interface the packet arrived from
+ * \param Address Pointer to the addres structure
+ * \param Length Size of packet in bytes
+ * \param Buffer Packet data
*/
void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
{
tTCPHeader *hdr = Buffer;
tTCPListener *srv;
tTCPConnection *conn;
-
+
+ Log_Log("TCP", "TCP_GetPacket: SourcePort = %i, DestPort = %i",
+ ntohs(hdr->SourcePort), ntohs(hdr->DestPort));
+/*
+ Log_Log("TCP", "TCP_GetPacket: SequenceNumber = 0x%x", ntohl(hdr->SequenceNumber));
+ Log_Log("TCP", "TCP_GetPacket: AcknowlegementNumber = 0x%x", ntohl(hdr->AcknowlegementNumber));
+ Log_Log("TCP", "TCP_GetPacket: DataOffset = %i", hdr->DataOffset >> 4);
+ Log_Log("TCP", "TCP_GetPacket: WindowSize = %i", htons(hdr->WindowSize));
+ Log_Log("TCP", "TCP_GetPacket: Checksum = 0x%x", htons(hdr->Checksum));
+ Log_Log("TCP", "TCP_GetPacket: UrgentPointer = 0x%x", htons(hdr->UrgentPointer));
+*/
+ Log_Log("TCP", "TCP_GetPacket: Flags = %s%s%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 )
+ {
+ Log_Log("TCP", "TCP_GetPacket: SequenceNumber = 0x%x", ntohl(hdr->SequenceNumber));
+ 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 != hdr->DestPort) continue;
+ if(srv->Port != htons(hdr->DestPort)) continue;
+ Log_Log("TCP", "TCP_GetPacket: Matches server %p", srv);
// Is this in an established connection?
for( conn = srv->Connections; conn; conn = conn->Next )
{
+ Log_Log("TCP", "TCP_GetPacket: conn->Interface(%p) == Interface(%p)",
+ conn->Interface, Interface);
// Check that it is coming in on the same interface
if(conn->Interface != Interface) continue;
-
+
// Check Source Port
- if(conn->RemotePort != hdr->SourcePort) continue;
-
+ Log_Log("TCP", "TCP_GetPacket: 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", "TCP_GetPacket: Matches connection %p", conn);
// We have a response!
- //TODO
-
+ TCP_INT_HandleConnectionPacket(conn, hdr, Length);
+
return;
}
+
+ Log_Log("TCP", "TCP_GetPacket: Opening Connection");
+ // Open a new connection (well, check that it's a SYN)
+ if(hdr->Flags != TCP_FLAG_SYN) {
+ Log_Log("TCP", "TCP_GetPacket: Packet is not a SYN");
+ return ;
+ }
+
+ // TODO: Check for halfopen max
+
+ conn = calloc(1, sizeof(tTCPConnection));
+ conn->State = TCP_ST_SYN_RCVD;
+ conn->LocalPort = srv->Port;
+ conn->RemotePort = ntohs(hdr->SourcePort);
+ conn->Interface = Interface;
- // Open a new connection
- //TODO
+ switch(Interface->Type)
+ {
+ case 4: conn->RemoteIP.v4 = *(tIPv4*)Address; break;
+ case 6: conn->RemoteIP.v6 = *(tIPv6*)Address; break;
+ }
- 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 )
{
- // TODO
+ // 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", "TCP_GetPacket: 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;
+
+ // Silently drop once finished
+ // TODO: Check if this needs to be here
+ if( Connection->State == TCP_ST_FINISHED ) {
+ Log_Log("TCP", "Packet ignored - connection finnished");
+ return ;
+ }
+
+ // Syncronise sequence values
+ if(Header->Flags & TCP_FLAG_SYN) {
+ // TODO: What if the packet also has data?
+ Connection->NextSequenceRcv = ntohl(Header->SequenceNumber);
+ }
+
+ // Ackowledge a sent packet
+ if(Header->Flags & TCP_FLAG_ACK) {
+ // TODO: Process an ACKed Packet
+ Log_Log("TCP", "Conn %p, Sent packet 0x%x ACKed", Connection, Header->AcknowlegementNumber);
+ }
+
+ // Get length of data
+ dataLen = Length - (Header->DataOffset>>4)*4;
+ Log_Log("TCP", "HandleConnectionPacket - dataLen = %i", dataLen);
+
+ //
+ // State Machine
+ //
+ switch( Connection->State )
+ {
+ // Pre-init conneciton?
+ case TCP_ST_CLOSED:
+ Log_Log("TCP", "Packets to a closed connection?!");
+ break;
+
+ // --- Init States ---
+ // SYN sent, expecting SYN-ACK Connection Opening
+ case TCP_ST_SYN_SENT:
+ if( Header->Flags & TCP_FLAG_SYN )
+ {
+ Connection->NextSequenceRcv ++;
+ 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;
+ TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
+
+ if( Header->Flags & TCP_FLAG_ACK )
+ {
+ Log_Log("TCP", "ACKing SYN-ACK");
+ Connection->State = TCP_ST_OPEN;
+ }
+ else
+ {
+ Log_Log("TCP", "ACKing SYN");
+ Connection->State = TCP_ST_SYN_RCVD;
+ }
+ }
+ break;
+
+ // SYN-ACK sent, expecting ACK
+ case TCP_ST_SYN_RCVD:
+ if( Header->Flags & TCP_FLAG_ACK )
+ {
+ // TODO: Handle max half-open limit
+ Connection->State = TCP_ST_OPEN;
+ Log_Log("TCP", "Connection fully opened");
+ }
+ break;
+
+ // --- Established State ---
+ case TCP_ST_OPEN:
+ // - Handle State changes
+ //
+ if( Header->Flags & TCP_FLAG_FIN ) {
+ Log_Log("TCP", "Conn %p closed, recieved FIN, acknowledging", Connection);
+ VFS_MarkError(&Connection->Node, 1);
+ Connection->State = TCP_ST_CLOSE_WAIT;
+ // CLOSE WAIT requires the client to close (or does it?)
+ #if 0
+
+ #endif
+ }
+
+ // Check for an empty packet
+ if(dataLen == 0) {
+ if( Header->Flags != TCP_FLAG_ACK )
+ {
+ Connection->NextSequenceRcv ++; // TODO: Is this right? (empty packet counts as one byte)
+ Log_Log("TCP", "Empty Packet, inc and ACK the current sequence number");
+ }
+ else
+ Log_Log("TCP", "Empty Packet, just ACKing the current sequence number");
+ 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 ;
+ }
+
+ // NOTES:
+ // Flags
+ // PSH - Has Data?
+ // /NOTES
+
+ // Allocate and fill cached packet
+ pkt = malloc( sizeof(tTCPStoredPacket) + dataLen );
+ pkt->Next = NULL;
+ pkt->Sequence = ntohl(Header->SequenceNumber);
+ pkt->Length = dataLen;
+ memcpy(pkt->Data, (Uint8*)Header + (Header->DataOffset>>4)*4, dataLen);
+
+ Log_Log("TCP", "0x%08x <= 0x%08x < 0x%08x",
+ Connection->NextSequenceRcv,
+ pkt->Sequence,
+ Connection->NextSequenceRcv + TCP_WINDOW_SIZE
+ );
+
+ // Is this packet the next expected packet?
+ if( pkt->Sequence == Connection->NextSequenceRcv )
+ {
+ // 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 ++;
+ }
+ // Check if the packet is in window
+ else if( WrapBetween(Connection->NextSequenceRcv, pkt->Sequence, Connection->NextSequenceRcv+TCP_WINDOW_SIZE, 0xFFFFFFFF) )
+ {
+ tTCPStoredPacket *tmp, *prev = NULL;
+
+ Log_Log("TCP", "We missed a packet, caching",
+ 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;
+ }
+
+ // Add if before first, or sequences don't match
+ if( !tmp || tmp->Sequence != pkt->Sequence )
+ {
+ if(prev)
+ prev->Next = pkt;
+ else
+ Connection->FuturePackets = pkt;
+ pkt->Next = tmp;
+ }
+ // Replace if larger
+ else if(pkt->Length > tmp->Length)
+ {
+ if(prev)
+ prev->Next = pkt;
+ pkt->Next = tmp->Next;
+ free(tmp);
+ }
+ else
+ {
+ free(pkt);
+ }
+ SHORTREL( &Connection->lFuturePackets );
+ }
+ // Badly out of sequence packet
+ else
+ {
+ Log_Log("TCP", "Fully out of sequence packet (0x%08x not between 0x%08x and 0x%08x), dropped",
+ pkt->Sequence, Connection->NextSequenceRcv, Connection->NextSequenceRcv+TCP_WINDOW_SIZE);
+ free(pkt);
+ // TODO: Spec says we should send an empty ACK with the current state
+ }
+ break;
+
+ // --- Remote close states
+ case TCP_ST_CLOSE_WAIT:
+
+ // Ignore everything, CLOSE_WAIT is terminated by the client
+ Log_Debug("TCP", "CLOSE WAIT - Ignoring packets");
+
+ break;
+
+ // LAST-ACK - Waiting for the ACK of FIN (from CLOSE WAIT)
+ case TCP_ST_LAST_ACK:
+ if( Header->Flags & TCP_FLAG_ACK )
+ {
+ Connection->State = TCP_ST_FINISHED; // Connection completed
+ Log_Log("TCP", "LAST-ACK to CLOSED - Connection remote closed");
+ // TODO: Destrory the TCB
+ }
+ break;
+
+ // --- Local close States
+ case TCP_ST_FIN_WAIT1:
+ if( Header->Flags & TCP_FLAG_FIN )
+ {
+ Connection->State = TCP_ST_CLOSING;
+ Log_Debug("TCP", "Conn %p closed, sent FIN and recieved FIN", Connection);
+ VFS_MarkError(&Connection->Node, 1);
+
+ // 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_ACK;
+ TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
+ break ;
+ }
+
+ // TODO: Make sure that the packet is actually ACKing the FIN
+ if( Header->Flags & TCP_FLAG_ACK )
+ {
+ Connection->State = TCP_ST_FIN_WAIT2;
+ Log_Debug("TCP", "Conn %p closed, sent FIN ACKed", Connection);
+ VFS_MarkError(&Connection->Node, 1);
+ return ;
+ }
+ break;
+
+ case TCP_ST_FIN_WAIT2:
+ if( Header->Flags & TCP_FLAG_FIN )
+ {
+ Connection->State = TCP_ST_TIME_WAIT;
+ Log_Debug("TCP", "FIN sent and recieved, ACKing and going into TIME WAIT %p FINWAIT-2 -> TIME WAIT", Connection);
+ // Send 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;
+ TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
+ }
+ break;
+
+ case TCP_ST_CLOSING:
+ // TODO: Make sure that the packet is actually ACKing the FIN
+ if( Header->Flags & TCP_FLAG_ACK )
+ {
+ Connection->State = TCP_ST_TIME_WAIT;
+ Log_Debug("TCP", "Conn %p CLOSING -> TIME WAIT", Connection);
+ VFS_MarkError(&Connection->Node, 1);
+ return ;
+ }
+ break;
+
+ // --- Closed (or near closed) states) ---
+ case TCP_ST_TIME_WAIT:
+ Log_Log("TCP", "Packets on Time-Wait, ignored");
+ break;
+
+ case TCP_ST_FINISHED:
+ Log_Log("TCP", "Packets when CLOSED, ignoring");
+ break;
+
+ //default:
+ // Log_Warning("TCP", "Unhandled TCP state %i", Connection->State);
+ // break;
+ }
+
+}
+
+/**
+ * \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 );
+
+ #if USE_SELECT
+ VFS_MarkAvaliable(&Connection->Node, 1);
+ #endif
+
+ 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;
+ for(;;)
+ {
+ SHORTLOCK( &Connection->lFuturePackets );
+
+ // Clear out duplicates from cache
+ // - If a packet has just been recieved, and it is expected, then
+ // (since NextSequenceRcv = rcvd->Sequence + rcvd->Length) all
+ // packets in cache that are smaller than the next expected
+ // are now defunct.
+ pkt = Connection->FuturePackets;
+ while(pkt && pkt->Sequence < Connection->NextSequenceRcv)
+ {
+ tTCPStoredPacket *next = pkt->Next;
+ free(pkt);
+ pkt = next;
+ }
+
+ // If there's no packets left in cache, stop looking
+ if(!pkt || pkt->Sequence > Connection->NextSequenceRcv) {
+ SHORTREL( &Connection->lFuturePackets );
+ return;
}
+
+ // Delete packet from future list
+ 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);
}
}
Uint16 TCP_GetUnusedPort()
{
Uint16 ret;
-
+
// Get Next outbound port
ret = giTCP_NextOutPort++;
while( gaTCP_PortBitmap[ret/32] & (1 << (ret%32)) )
ret = giTCP_NextOutPort = TCP_MIN_DYNPORT;
}
}
-
+
// Mark the new port as used
gaTCP_PortBitmap[ret/32] |= 1 << (ret%32);
-
+
return ret;
}
// 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;
}
// 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;
+ size_t len;
+
+ ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
+ LOG("conn = %p {State:%i}", conn, conn->State);
+
+ // Check if connection is open
+ while( conn->State == TCP_ST_SYN_RCVD || conn->State == TCP_ST_SYN_SENT )
+ Threads_Yield();
+
+ if( conn->State != TCP_ST_OPEN )
+ {
+ Mutex_Acquire( &conn->lRecievedPackets );
+ len = RingBuffer_Read( Buffer, conn->RecievedBuffer, Length );
+ Mutex_Release( &conn->lRecievedPackets );
+
+ if( len == 0 ) {
+ VFS_MarkAvaliable(Node, 0);
+ LEAVE('i', -1);
+ return -1;
+ }
+
+ LEAVE('i', len);
+ return len;
+ }
+
+ // Wait
+ VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "TCP_Client_Read");
+
+ // Lock list and read
+ Mutex_Acquire( &conn->lRecievedPackets );
+
+ // Attempt to read all `Length` bytes
+ len = RingBuffer_Read( Buffer, conn->RecievedBuffer, Length );
+
+ if( len == 0 || conn->RecievedBuffer->Length == 0 ) {
+ LOG("Marking as none avaliable (len = %i)", len);
+ VFS_MarkAvaliable(Node, 0);
+ }
+
+ // 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);
+
+ Log_Debug("TCP", "Send sequence 0x%08x", Connection->NextSequenceSend);
+ Debug_HexDump("[TCP ] TCP_INT_SendDataPacket: Data = ",
+ 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_SYN_RCVD || conn->State == TCP_ST_SYN_SENT )
+ Threads_Yield();
+
+ if( conn->State != TCP_ST_OPEN ) {
+ VFS_MarkError(Node, 1);
+ LEAVE('i', -1);
+ return -1;
+ }
+
+ 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;
+
+ ENTER("pNode iID pData", Node, ID, Data);
+
+ switch(ID)
+ {
+ case 4: // Get/Set local port
+ if(!Data)
+ LEAVE_RET('i', conn->LocalPort);
+ if(conn->State != TCP_ST_CLOSED)
+ LEAVE_RET('i', -1);
+ if(!CheckMem(Data, sizeof(Uint16)))
+ LEAVE_RET('i', -1);
+
+ if(Threads_GetUID() != 0 && *(Uint16*)Data < 1024)
+ LEAVE_RET('i', -1);
+
+ conn->LocalPort = *(Uint16*)Data;
+ LEAVE_RET('i', conn->LocalPort);
+
+ case 5: // Get/Set remote port
+ if(!Data) LEAVE_RET('i', conn->RemotePort);
+ if(conn->State != TCP_ST_CLOSED) LEAVE_RET('i', -1);
+ if(!CheckMem(Data, sizeof(Uint16))) LEAVE_RET('i', -1);
+ conn->RemotePort = *(Uint16*)Data;
+ LEAVE_RET('i', conn->RemotePort);
+
+ case 6: // Set Remote IP
+ if( conn->State != TCP_ST_CLOSED )
+ LEAVE_RET('i', -1);
+ if( conn->Interface->Type == 4 )
+ {
+ if(!CheckMem(Data, sizeof(tIPv4))) LEAVE_RET('i', -1);
+ conn->RemoteIP.v4 = *(tIPv4*)Data;
+ }
+ else if( conn->Interface->Type == 6 )
+ {
+ if(!CheckMem(Data, sizeof(tIPv6))) LEAVE_RET('i', -1);
+ conn->RemoteIP.v6 = *(tIPv6*)Data;
+ }
+ LEAVE_RET('i', 0);
+
+ case 7: // Connect
+ if(conn->LocalPort == 0xFFFF)
+ conn->LocalPort = TCP_GetUnusedPort();
+ if(conn->RemotePort == -1)
+ LEAVE_RET('i', 0);
+
+ TCP_StartConnection(conn);
+ LEAVE_RET('i', 1);
+
+ // Get recieve buffer length
+ case 8:
+ LEAVE_RET('i', conn->RecievedBuffer->Length);
+ }
+
+ return 0;
+}
+
+void TCP_Client_Close(tVFS_Node *Node)
+{
+ tTCPConnection *conn = Node->ImplPtr;
+ tTCPHeader packet;
+
+ ENTER("pNode", Node);
+
+ if( conn->State == TCP_ST_CLOSE_WAIT || conn->State == TCP_ST_OPEN )
+ {
+ 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|TCP_FLAG_ACK;
+
+ TCP_SendPacket( conn, sizeof(tTCPHeader), &packet );
+ }
+
+ switch( conn->State )
+ {
+ case TCP_ST_CLOSE_WAIT:
+ conn->State = TCP_ST_CLOSED;
+ break;
+ case TCP_ST_OPEN:
+ conn->State = TCP_ST_FIN_WAIT1;
+ while( conn->State == TCP_ST_FIN_WAIT1 ) Threads_Yield();
+ break;
+ default:
+ Log_Warning("TCP", "Unhandled connection state in TCP_Client_Close");
+ break;
+ }
+
+ free(conn);
+
+ LEAVE('-');
+}
+
+/**
+ * \brief Checks if a value is between two others (after taking into account wrapping)
+ */
+int WrapBetween(Uint32 Lower, Uint32 Value, Uint32 Higher, Uint32 MaxValue)
+{
+ if( MaxValue < 0xFFFFFFFF )
+ {
+ Lower %= MaxValue + 1;
+ Value %= MaxValue + 1;
+ Higher %= MaxValue + 1;
+ }
+
+ // Simple Case, no wrap ?
+ // Lower Value Higher
+ // | ... + ... + ... + ... |
+
+ if( Lower < Higher ) {
+ return Lower < Value && Value < Higher;
+ }
+ // Higher has wrapped below lower
+
+ // Value > Lower ?
+ // Higher Lower Value
+ // | ... + ... + ... + ... |
+ if( Value > Lower ) {
+ return 1;
+ }
+
+ // Value < Higher ?
+ // Value Higher Lower
+ // | ... + ... + ... + ... |
+ if( Value < Higher ) {
+ return 1;
+ }
+
+ return 0;
+}
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au