#include "ipv4.h"
#include "tcp.h"
+#define USE_SELECT 1
+
#define TCP_MIN_DYNPORT 0xC000
#define TCP_MAX_HALFOPEN 1024 // Should be enough
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};
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: Flags = {");
- Log_Log("TCP", "TCP_GetPacket: CWR = %B, ECE = %B",
- !!(hdr->Flags & TCP_FLAG_CWR), !!(hdr->Flags & TCP_FLAG_ECE));
- Log_Log("TCP", "TCP_GetPacket: URG = %B, ACK = %B",
- !!(hdr->Flags & TCP_FLAG_URG), !!(hdr->Flags & TCP_FLAG_ACK));
- Log_Log("TCP", "TCP_GetPacket: PSH = %B, RST = %B",
- !!(hdr->Flags & TCP_FLAG_PSH), !!(hdr->Flags & TCP_FLAG_RST));
- Log_Log("TCP", "TCP_GetPacket: SYN = %B, FIN = %B",
- !!(hdr->Flags & TCP_FLAG_SYN), !!(hdr->Flags & TCP_FLAG_FIN));
- Log_Log("TCP", "TCP_GetPacket: }");
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",
+ 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 " : "",
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,
// TODO: Check for halfopen max
conn = calloc(1, sizeof(tTCPConnection));
- conn->State = TCP_ST_HALFOPEN;
+ conn->State = TCP_ST_SYN_RCVD;
conn->LocalPort = srv->Port;
conn->RemotePort = ntohs(hdr->SourcePort);
conn->Interface = Interface;
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) {
- Connection->NextSequenceRcv = ntohl(Header->SequenceNumber) + 1;
+ // 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);
}
- // Handle a server replying to our initial SYN
- if( Connection->State == TCP_ST_SYN_SENT )
+ // Get length of data
+ dataLen = Length - (Header->DataOffset>>4)*4;
+ Log_Log("TCP", "HandleConnectionPacket - dataLen = %i", dataLen);
+
+ //
+ // State Machine
+ //
+ switch( Connection->State )
{
- if( (Header->Flags & (TCP_FLAG_SYN|TCP_FLAG_ACK)) == (TCP_FLAG_SYN|TCP_FLAG_ACK) )
- {
+ // 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->WindowSize = htons(TCP_WINDOW_SIZE);
Header->Flags = TCP_FLAG_ACK;
Header->DataOffset = (sizeof(tTCPHeader)/4) << 4;
- Log_Log("TCP", "ACKing SYN-ACK");
TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
- Connection->State = TCP_ST_OPEN;
+
+ 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;
- // Handle a client confirming the connection
- if( Connection->State == TCP_ST_HALFOPEN && (Header->Flags & TCP_FLAG_ACK) )
- {
- Connection->State = TCP_ST_OPEN;
- Log_Log("TCP", "Connection fully opened");
- }
+ // 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
+ }
- // Get length of data
- dataLen = Length - (Header->DataOffset>>4)*4;
- Log_Log("TCP", "HandleConnectionPacket - dataLen = %i", dataLen);
+ // 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;
- if(Header->Flags & TCP_FLAG_ACK) {
- // TODO: Process an ACKed Packet
- Log_Log("TCP", "Conn %p, Packet 0x%x ACKed", Connection, Header->AcknowlegementNumber);
- }
+ // --- 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;
- // TODO: Check what to do here
- if(Header->Flags & TCP_FLAG_FIN) {
- if( Connection->State == TCP_ST_FIN_SENT ) {
- Connection->State = TCP_ST_FINISHED;
- return ;
+ // 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
}
- else {
- Connection->State = TCP_ST_FINISHED;
+ 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;
- // Check for an empty packet
- if(dataLen == 0) {
- Log_Log("TCP", "Empty Packet");
- return ;
- }
+ 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;
- // NOTES:
- // Flags
- // PSH - Has Data?
- // /NOTES
-
- // Allocate and fill cached packet
- pkt = malloc( dataLen + sizeof(tTCPStoredPacket) );
- pkt->Next = NULL;
- pkt->Sequence = ntohl(Header->SequenceNumber);
- pkt->Length = dataLen;
- memcpy(pkt->Data, (Uint8*)Header + (Header->DataOffset>>4)*4, dataLen);
-
- // Is this packet the next expected packet?
- // TODO: Fix this to check if the packet is in the window.
- if( pkt->Sequence != Connection->NextSequenceRcv )
- {
- tTCPStoredPacket *tmp, *prev = NULL;
-
- Log_Log("TCP", "Out of sequence packet (0x%08x != 0x%08x)",
- pkt->Sequence, Connection->NextSequenceRcv);
-
- // No? Well, let's cache it and look at it later
- SHORTLOCK( &Connection->lFuturePackets );
- for(tmp = Connection->FuturePackets;
- tmp;
- prev = tmp, tmp = tmp->Next)
+ case TCP_ST_CLOSING:
+ // TODO: Make sure that the packet is actually ACKing the FIN
+ if( Header->Flags & TCP_FLAG_ACK )
{
- if(tmp->Sequence > pkt->Sequence) break;
+ Connection->State = TCP_ST_TIME_WAIT;
+ Log_Debug("TCP", "Conn %p CLOSING -> TIME WAIT", Connection);
+ VFS_MarkError(&Connection->Node, 1);
+ return ;
}
- if(prev)
- prev->Next = pkt;
- else
- Connection->FuturePackets = pkt;
- pkt->Next = tmp;
- SHORTREL( &Connection->lFuturePackets );
- }
- else
- {
- // Ooh, Goodie! Add it to the recieved list
- TCP_INT_AppendRecieved(Connection, pkt);
- free(pkt);
- Log_Log("TCP", "0x%08x += %i", Connection->NextSequenceRcv, dataLen);
- Connection->NextSequenceRcv += dataLen;
-
- // TODO: This should be moved out of the watcher thread,
- // so that a single lost packet on one connection doesn't cause
- // all connections on the interface to lag.
- TCP_INT_UpdateRecievedFromFuture(Connection);
-
- // ACK Packet
- Header->DestPort = Header->SourcePort;
- Header->SourcePort = htons(Connection->LocalPort);
- Header->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
- Header->SequenceNumber = htonl(Connection->NextSequenceSend);
- Header->WindowSize = htons(TCP_WINDOW_SIZE);
- Header->Flags &= TCP_FLAG_SYN; // Eliminate all flags save for SYN
- Header->Flags |= TCP_FLAG_ACK; // Add ACK
- Log_Log("TCP", "Sending ACK for 0x%08x", Connection->NextSequenceRcv);
- TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
- //Connection->NextSequenceSend ++;
+ 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;
}
+
}
/**
}
RingBuffer_Write( Connection->RecievedBuffer, Pkt->Data, Pkt->Length );
+
+ #if USE_SELECT
+ VFS_MarkAvaliable(&Connection->Node, 1);
+ #endif
Mutex_Release( &Connection->lRecievedPackets );
}
*/
void TCP_INT_UpdateRecievedFromFuture(tTCPConnection *Connection)
{
- tTCPStoredPacket *pkt, *prev;
+ tTCPStoredPacket *pkt;
for(;;)
{
- prev = NULL;
- // Look for the next expected packet in the cache.
SHORTLOCK( &Connection->lFuturePackets );
- for(pkt = Connection->FuturePackets;
- pkt && pkt->Sequence < Connection->NextSequenceRcv;
- prev = pkt, pkt = pkt->Next);
- // If we can't find the expected next packet, stop looking
+ // 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
- if(prev)
- prev->Next = pkt->Next;
- else
- Connection->FuturePackets = pkt->Next;
+ Connection->FuturePackets = pkt->Next;
// Release list
SHORTREL( &Connection->lFuturePackets );
Uint64 TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
{
tTCPConnection *conn = Node->ImplPtr;
- char *destbuf = Buffer;
size_t len;
ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
- LOG("conn = %p", conn);
- LOG("conn->State = %i", conn->State);
+ LOG("conn = %p {State:%i}", conn, conn->State);
// Check if connection is open
- while( conn->State == TCP_ST_HALFOPEN || conn->State == TCP_ST_SYN_SENT )
+ while( conn->State == TCP_ST_SYN_RCVD || conn->State == TCP_ST_SYN_SENT )
Threads_Yield();
- if( conn->State != TCP_ST_OPEN ) {
- LEAVE('i', 0);
- return 0;
- }
- // Poll packets
- for(;;)
+ if( conn->State != TCP_ST_OPEN )
{
- // Lock list and check if there is a packet
Mutex_Acquire( &conn->lRecievedPackets );
- if( conn->RecievedBuffer->Length == 0 ) {
- // If not, release the lock, yield and try again
- Mutex_Release( &conn->lRecievedPackets );
- Threads_Yield(); // TODO: Less expensive wait
- continue;
- }
+ len = RingBuffer_Read( Buffer, conn->RecievedBuffer, Length );
+ Mutex_Release( &conn->lRecievedPackets );
- // Attempt to read all `Length` bytes
- len = RingBuffer_Read( destbuf, conn->RecievedBuffer, Length );
+ if( len == 0 ) {
+ VFS_MarkAvaliable(Node, 0);
+ LEAVE('i', -1);
+ return -1;
+ }
- // Release the lock (we don't need it any more)
- Mutex_Release( &conn->lRecievedPackets );
-
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;
}
/**
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;
ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
// Check if connection is open
- while( conn->State == TCP_ST_HALFOPEN || conn->State == TCP_ST_SYN_SENT )
+ while( conn->State == TCP_ST_SYN_RCVD || conn->State == TCP_ST_SYN_SENT )
Threads_Yield();
+
if( conn->State != TCP_ST_OPEN ) {
- LEAVE('i', 0);
- return 0;
+ VFS_MarkError(Node, 1);
+ LEAVE('i', -1);
+ return -1;
}
while( rem > TCP_MAX_PACKET_SIZE )
ENTER("pNode", Node);
- packet.SourcePort = htons(conn->LocalPort);
- packet.DestPort = htons(conn->RemotePort);
- packet.DataOffset = (sizeof(tTCPHeader)/4)*16;
- packet.WindowSize = TCP_WINDOW_SIZE;
+ 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 );
+ }
- packet.AcknowlegementNumber = 0;
- packet.SequenceNumber = htonl(conn->NextSequenceSend);
- packet.Flags = TCP_FLAG_FIN;
+ 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;
+ }
- conn->State = TCP_ST_FIN_SENT;
+ 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;
+ }
- TCP_SendPacket( conn, sizeof(tTCPHeader), &packet );
+ // Simple Case, no wrap ?
+ // Lower Value Higher
+ // | ... + ... + ... + ... |
+
+ if( Lower < Higher ) {
+ return Lower < Value && Value < Higher;
+ }
+ // Higher has wrapped below lower
- while( conn->State == TCP_ST_FIN_SENT ) Threads_Yield();
+ // Value > Lower ?
+ // Higher Lower Value
+ // | ... + ... + ... + ... |
+ if( Value > Lower ) {
+ return 1;
+ }
- free(conn);
+ // Value < Higher ?
+ // Value Higher Lower
+ // | ... + ... + ... + ... |
+ if( Value < Higher ) {
+ return 1;
+ }
- LEAVE('-');
+ return 0;
}
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au