#define DEBUG 1
#include "ipstack.h"
#include "ipv4.h"
+#include "ipv6.h"
#include "tcp.h"
+#define USE_SELECT 1
+#define HEXDUMP_INCOMING 0
+#define HEXDUMP_OUTGOING 0
+#define CACHE_FUTURE_PACKETS_IN_BYTES 1 // Use a ring buffer to cache out of order packets
+
#define TCP_MIN_DYNPORT 0xC000
#define TCP_MAX_HALFOPEN 1024 // Should be enough
#define TCP_RECIEVE_BUFFER_SIZE 0x4000
// === PROTOTYPES ===
-void TCP_Initialise();
+void TCP_Initialise(void);
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);
+int TCP_INT_AppendRecieved(tTCPConnection *Connection, const void *Data, size_t Length);
void TCP_INT_UpdateRecievedFromFuture(tTCPConnection *Connection);
Uint16 TCP_GetUnusedPort();
int TCP_AllocatePort(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, char *Name);
+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
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};
// === GLOBALS ===
int giTCP_NumHalfopen = 0;
-tSpinlock glTCP_Listeners;
+tShortSpinlock glTCP_Listeners;
tTCPListener *gTCP_Listeners;
-tSpinlock glTCP_OutbountCons;
+tShortSpinlock glTCP_OutbountCons;
tTCPConnection *gTCP_OutbountCons;
Uint32 gaTCP_PortBitmap[0x800];
int giTCP_NextOutPort = TCP_MIN_DYNPORT;
*
* Registers the client and server files and the GetPacket callback
*/
-void TCP_Initialise()
+void TCP_Initialise(void)
{
+ giTCP_NextOutPort += rand()%32;
IPStack_AddFile(&gTCP_ServerFile);
IPStack_AddFile(&gTCP_ClientFile);
IPv4_RegisterCallback(IP4PROT_TCP, TCP_GetPacket);
-}
-
-/**
- * \brief Open a connection to another host using TCP
- * \param Conn Connection structure
- */
-void TCP_StartConnection(tTCPConnection *Conn)
-{
- tTCPHeader hdr;
-
- 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
- hdr.UrgentPointer = 0;
-
- TCP_SendPacket( Conn, sizeof(tTCPHeader), &hdr );
- return ;
+ IPv6_RegisterCallback(IP4PROT_TCP, TCP_GetPacket);
}
/**
*/
void TCP_SendPacket( tTCPConnection *Conn, size_t Length, tTCPHeader *Data )
{
- size_t buflen;
- Uint32 *buf;
+ Uint16 checksum[2];
+
+ Data->Checksum = 0;
+ checksum[1] = htons( ~IPv4_Checksum( (void*)Data, Length ) ); // Partial checksum
+ if(Length & 1)
+ ((Uint8*)Data)[Length] = 0;
+
+ // TODO: Fragment packet
+
switch( Conn->Interface->Type )
{
- case 4: // Append IPv4 Pseudo Header
- buflen = 4 + 4 + 4 + ((Length+1)&~1);
- buf = malloc( buflen );
- buf[0] = Conn->Interface->IP4.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 = IPv4_Checksum( buf, buflen );
- free(buf);
+ case 4:
+ // Append IPv4 Pseudo Header
+ {
+ Uint32 buf[3];
+ buf[0] = ((tIPv4*)Conn->Interface->Address)->L;
+ buf[1] = Conn->RemoteIP.v4.L;
+ buf[2] = (htons(Length)<<16) | (6<<8) | 0;
+ checksum[0] = htons( ~IPv4_Checksum(buf, sizeof(buf)) ); // Partial checksum
+ }
+ Data->Checksum = htons( IPv4_Checksum(checksum, 2*2) ); // Combine the two
IPv4_SendPacket(Conn->Interface, Conn->RemoteIP.v4, IP4PROT_TCP, 0, Length, Data);
break;
+
+ case 6:
+ // Append IPv6 Pseudo Header
+ {
+ Uint32 buf[4+4+1+1];
+ memcpy(buf, Conn->Interface->Address, 16);
+ memcpy(&buf[4], &Conn->RemoteIP, 16);
+ buf[8] = htonl(Length);
+ buf[9] = htonl(6);
+ checksum[0] = htons( ~IPv4_Checksum(buf, sizeof(buf)) ); // Partial checksum
+ }
+ Data->Checksum = htons( IPv4_Checksum(checksum, 2*2) ); // Combine the two
+ IPv6_SendPacket(Conn->Interface, Conn->RemoteIP.v6, IP4PROT_TCP, Length, Data);
+ break;
}
}
tTCPListener *srv;
tTCPConnection *conn;
- Log_Log("TCP", "SourcePort = %i, DestPort = %i",
- ntohs(hdr->SourcePort), ntohs(hdr->DestPort));
-/*
- Log_Log("TCP", "SequenceNumber = 0x%x", ntohl(hdr->SequenceNumber));
- Log_Log("TCP", "AcknowlegementNumber = 0x%x", ntohl(hdr->AcknowlegementNumber));
- Log_Log("TCP", "DataOffset = %i", hdr->DataOffset >> 4);
- Log_Log("TCP", "Flags = {");
- Log_Log("TCP", " CWR = %B, ECE = %B",
- !!(hdr->Flags & TCP_FLAG_CWR), !!(hdr->Flags & TCP_FLAG_ECE));
- Log_Log("TCP", " URG = %B, ACK = %B",
- !!(hdr->Flags & TCP_FLAG_URG), !!(hdr->Flags & TCP_FLAG_ACK));
- Log_Log("TCP", " PSH = %B, RST = %B",
- !!(hdr->Flags & TCP_FLAG_PSH), !!(hdr->Flags & TCP_FLAG_RST));
- Log_Log("TCP", " SYN = %B, FIN = %B",
- !!(hdr->Flags & TCP_FLAG_SYN), !!(hdr->Flags & TCP_FLAG_FIN));
- Log_Log("TCP", "}");
- Log_Log("TCP", "WindowSize = %i", htons(hdr->WindowSize));
- Log_Log("TCP", "Checksum = 0x%x", htons(hdr->Checksum));
- Log_Log("TCP", "UrgentPointer = 0x%x", htons(hdr->UrgentPointer));
-*/
+ Log_Log("TCP", "TCP_GetPacket: <Local>:%i from [%s]:%i, Flags= %s%s%s%s%s%s%s%s",
+ ntohs(hdr->SourcePort),
+ IPStack_PrintAddress(Interface->Type, Address),
+ ntohs(hdr->DestPort),
+ (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));
+#if HEXDUMP_INCOMING
Debug_HexDump(
- "[TCP ] Packet Data = ",
+ "TCP_GetPacket: Packet Data = ",
(Uint8*)hdr + (hdr->DataOffset >> 4)*4,
Length - (hdr->DataOffset >> 4)*4
);
+#endif
}
// Check Servers
// Check the destination port
if(srv->Port != htons(hdr->DestPort)) continue;
- Log_Log("TCP", "Matches server %p", srv);
+ 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", "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
- Log_Log("TCP", "conn->RemotePort(%i) == hdr->SourcePort(%i)",
+ 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;
+ if( IPStack_CompareAddress(conn->Interface->Type, &conn->RemoteIP, Address, -1) != 0 )
+ continue ;
- Log_Log("TCP", "Matches connection %p", conn);
+ Log_Log("TCP", "TCP_GetPacket: Matches connection %p", conn);
// We have a response!
TCP_INT_HandleConnectionPacket(conn, hdr, Length);
return;
}
- Log_Log("TCP", "Opening Connection");
+ 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", "Packet is not a 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_HALFOPEN;
+ conn->State = TCP_ST_SYN_RCVD;
conn->LocalPort = srv->Port;
conn->RemotePort = ntohs(hdr->SourcePort);
conn->Interface = Interface;
// 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
- LOCK(&srv->lConnections);
+ SHORTLOCK(&srv->lConnections);
if( !srv->Connections )
srv->Connections = conn;
else
srv->ConnectionsTail = conn;
if(!srv->NewConnections)
srv->NewConnections = conn;
- RELEASE(&srv->lConnections);
+ SHORTREL(&srv->lConnections);
// Send the SYN ACK
hdr->Flags |= TCP_FLAG_ACK;
}
}
- Log_Log("TCP", "No Match");
+ Log_Log("TCP", "TCP_GetPacket: No Match");
}
/**
* \param Length Length of the packet
*/
void TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header, int Length)
-{
- tTCPStoredPacket *pkt;
+{
int dataLen;
+ Uint32 sequence_num;
+
+ // 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);
}
- if( Connection->State == TCP_ST_SYN_SENT )
+ // 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 )
{
- if( Header->Flags & (TCP_FLAG_SYN|TCP_FLAG_ACK) ) {
-
+ // Pre-init connection?
+ 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 );
+
+ 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;
+ }
}
- Connection->State = TCP_ST_OPEN;
- }
-
- // Get length of data
- dataLen = Length - (Header->DataOffset>>4)*4;
- Log_Log("TCP", "HandleConnectionPacket - dataLen = %i", dataLen);
-
- if(Header->Flags & TCP_FLAG_ACK) {
- // TODO: Process an ACKed Packet
- Log_Log("TCP", "Conn %p, Packet 0x%x ACKed", Connection, Header->AcknowlegementNumber);
- }
+ break;
- // TODO: Check what to do here
- if(Header->Flags & TCP_FLAG_FIN) {
- if( Connection->State == TCP_ST_FIN_SENT ) {
+ // 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", Connection);
+ VFS_MarkError(&Connection->Node, 1);
+ Connection->State = TCP_ST_CLOSE_WAIT;
+// Header->Flags &= ~TCP_FLAG_FIN;
+ // CLOSE WAIT requires the client to close (or does it?)
+ #if 0
+ #endif
}
- else {
- Connection->State = TCP_ST_FINISHED;
+
+ // Check for an empty packet
+ if(dataLen == 0) {
+ if( Header->Flags == TCP_FLAG_ACK )
+ {
+ Log_Log("TCP", "ACK only packet");
+ return ;
+ }
+ Connection->NextSequenceRcv ++; // TODO: Is this right? (empty packet counts as one byte)
+ Log_Log("TCP", "Empty Packet, inc and ACK 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;
+ Header->Flags |= TCP_FLAG_ACK;
TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
return ;
}
- }
-
- if(dataLen == 0) {
- Log_Log("TCP", "Empty Packet");
- return ;
- }
-
- // 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);
+ // NOTES:
+ // Flags
+ // PSH - Has Data?
+ // /NOTES
+
+ sequence_num = ntohl(Header->SequenceNumber);
- // No? Well, let's cache it and look at it later
- LOCK( &Connection->lFuturePackets );
- for(tmp = Connection->FuturePackets;
- tmp;
- prev = tmp, tmp = tmp->Next)
+ Log_Log("TCP", "0x%08x <= 0x%08x < 0x%08x",
+ Connection->NextSequenceRcv,
+ ntohl(Header->SequenceNumber),
+ Connection->NextSequenceRcv + TCP_WINDOW_SIZE
+ );
+
+ // Is this packet the next expected packet?
+ if( sequence_num == Connection->NextSequenceRcv )
+ {
+ int rv;
+ // Ooh, Goodie! Add it to the recieved list
+ rv = TCP_INT_AppendRecieved(Connection,
+ (Uint8*)Header + (Header->DataOffset>>4)*4,
+ dataLen
+ );
+ if(rv != 0) {
+ break;
+ }
+ 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.
+ // - Meh, no real issue, as the cache shouldn't be that large
+ 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, sequence_num,
+ Connection->NextSequenceRcv+TCP_WINDOW_SIZE, 0xFFFFFFFF) )
{
- if(tmp->Sequence > pkt->Sequence) break;
+ Uint8 *dataptr = (Uint8*)Header + (Header->DataOffset>>4)*4;
+ #if CACHE_FUTURE_PACKETS_IN_BYTES
+ Uint32 index;
+ int i;
+
+ index = sequence_num % TCP_WINDOW_SIZE;
+ for( i = 0; i < dataLen; i ++ )
+ {
+ Connection->FuturePacketValidBytes[index/8] |= 1 << (index%8);
+ Connection->FuturePacketData[index] = dataptr[i];
+ // Do a wrap increment
+ index ++;
+ if(index == TCP_WINDOW_SIZE) index = 0;
+ }
+ #else
+ tTCPStoredPacket *pkt, *tmp, *prev = NULL;
+
+ // Allocate and fill cached packet
+ pkt = malloc( sizeof(tTCPStoredPacket) + dataLen );
+ pkt->Next = NULL;
+ pkt->Sequence = ntohl(Header->SequenceNumber);
+ pkt->Length = dataLen;
+ memcpy(pkt->Data, dataptr, dataLen);
+
+ 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); // TODO: Find some way to remove this
+ }
+ SHORTREL( &Connection->lFuturePackets );
+ #endif
}
- if(prev)
- prev->Next = pkt;
+ // Badly out of sequence packet
else
- Connection->FuturePackets = pkt;
- pkt->Next = tmp;
- RELEASE( &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;
+ {
+ Log_Log("TCP", "Fully out of sequence packet (0x%08x not between 0x%08x and 0x%08x), dropped",
+ sequence_num, Connection->NextSequenceRcv, Connection->NextSequenceRcv+TCP_WINDOW_SIZE);
+ // 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");
- // 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;
+
+ // 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 = Header->SequenceNumber;
+ 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 = Header->SequenceNumber;
+ 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
+ * \param Data Packet contents
+ * \param Length Length of \a Data
*/
-void TCP_INT_AppendRecieved(tTCPConnection *Connection, tTCPStoredPacket *Pkt)
+int TCP_INT_AppendRecieved(tTCPConnection *Connection, const void *Data, size_t Length)
{
- LOCK( &Connection->lRecievedPackets );
- if(Connection->RecievedBuffer->Length + Pkt->Length > Connection->RecievedBuffer->Space )
+ Mutex_Acquire( &Connection->lRecievedPackets );
+
+ if(Connection->RecievedBuffer->Length + Length > Connection->RecievedBuffer->Space )
{
- Log_Error("TCP", "Buffer filled, packet dropped (%s)",
- // TCP_INT_DumpConnection(Connection)
- ""
+ VFS_MarkAvaliable(&Connection->Node, 1);
+ Log_Error("TCP", "Buffer filled, packet dropped (:%i) - %i + %i > %i",
+ Connection->LocalPort, Connection->RecievedBuffer->Length, Length,
+ Connection->RecievedBuffer->Space
);
- return ;
+ Mutex_Release( &Connection->lRecievedPackets );
+ return 1;
}
- RingBuffer_Write( Connection->RecievedBuffer, Pkt->Data, Pkt->Length );
+ RingBuffer_Write( Connection->RecievedBuffer, Data, Length );
+
+ VFS_MarkAvaliable(&Connection->Node, 1);
- RELEASE( &Connection->lRecievedPackets );
+ Mutex_Release( &Connection->lRecievedPackets );
+ return 0;
}
/**
*/
void TCP_INT_UpdateRecievedFromFuture(tTCPConnection *Connection)
{
- tTCPStoredPacket *pkt, *prev;
+ #if CACHE_FUTURE_PACKETS_IN_BYTES
+ int i, length = 0;
+ Uint32 index;
+
+ // Calculate length of contiguous bytes
+ length = Connection->HighestSequenceRcvd - Connection->NextSequenceRcv;
+ index = Connection->NextSequenceRcv % TCP_WINDOW_SIZE;
+ for( i = 0; i < length; i ++ )
+ {
+ if( Connection->FuturePacketValidBytes[i / 8] == 0xFF ) {
+ i += 7; index += 7;
+ continue;
+ }
+ else if( !(Connection->FuturePacketValidBytes[i / 8] & (1 << (i%8))) )
+ break;
+
+ index ++;
+ if(index > TCP_WINDOW_SIZE)
+ index -= TCP_WINDOW_SIZE;
+ }
+ length = i;
+
+ index = Connection->NextSequenceRcv % TCP_WINDOW_SIZE;
+
+ // Write data to to the ring buffer
+ if( TCP_WINDOW_SIZE - index > length )
+ {
+ // Simple case
+ RingBuffer_Write( Connection->RecievedBuffer, Connection->FuturePacketData + index, length );
+ }
+ else
+ {
+ int endLen = TCP_WINDOW_SIZE - index;
+ // 2-part case
+ RingBuffer_Write( Connection->RecievedBuffer, Connection->FuturePacketData + index, endLen );
+ RingBuffer_Write( Connection->RecievedBuffer, Connection->FuturePacketData, endLen - length );
+ }
+
+ // Mark (now saved) bytes as invalid
+ // - Align index
+ while(index % 8 && length)
+ {
+ Connection->FuturePacketData[index] = 0;
+ Connection->FuturePacketData[index/8] &= ~(1 << (index%8));
+ index ++;
+ if(index > TCP_WINDOW_SIZE)
+ index -= TCP_WINDOW_SIZE;
+ length --;
+ }
+ while( length > 7 )
+ {
+ Connection->FuturePacketData[index] = 0;
+ Connection->FuturePacketValidBytes[index/8] = 0;
+ length -= 8;
+ index += 8;
+ if(index > TCP_WINDOW_SIZE)
+ index -= TCP_WINDOW_SIZE;
+ }
+ while(length)
+ {
+ Connection->FuturePacketData[index] = 0;
+ Connection->FuturePacketData[index/8] &= ~(1 << (index%8));
+ index ++;
+ if(index > TCP_WINDOW_SIZE)
+ index -= TCP_WINDOW_SIZE;
+ length --;
+ }
+
+ #else
+ tTCPStoredPacket *pkt;
for(;;)
{
- prev = NULL;
- // Look for the next expected packet in the cache.
- LOCK( &Connection->lFuturePackets );
- for(pkt = Connection->FuturePackets;
- pkt && pkt->Sequence < Connection->NextSequenceRcv;
- prev = pkt, pkt = pkt->Next);
+ SHORTLOCK( &Connection->lFuturePackets );
- // 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) {
- RELEASE( &Connection->lFuturePackets );
+ 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
- RELEASE( &Connection->lFuturePackets );
+ SHORTREL( &Connection->lFuturePackets );
// Looks like we found one
TCP_INT_AppendRecieved(Connection, pkt);
Connection->NextSequenceRcv += pkt->Length;
free(pkt);
}
+ #endif
}
/**
srv->Node.IOCtl = TCP_Server_IOCtl;
srv->Node.Close = TCP_Server_Close;
- LOCK(&glTCP_Listeners);
+ SHORTLOCK(&glTCP_Listeners);
srv->Next = gTCP_Listeners;
gTCP_Listeners = srv;
- RELEASE(&glTCP_Listeners);
+ SHORTREL(&glTCP_Listeners);
return &srv->Node;
}
Log_Log("TCP", "Thread %i waiting for a connection", Threads_GetTID());
for(;;)
{
- LOCK( &srv->lConnections );
+ SHORTLOCK( &srv->lConnections );
if( srv->NewConnections != NULL ) break;
- RELEASE( &srv->lConnections );
- Threads_Yield();
+ SHORTREL( &srv->lConnections );
+ Threads_Yield(); // TODO: Sleep until poked
continue;
}
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);
-
- RELEASE( &srv->lConnections );
ret = malloc(9);
itoa(ret, conn->Node.ImplInt, 16, 8, '0');
* \param Node Server node
* \param Name Hexadecimal ID of the node
*/
-tVFS_Node *TCP_Server_FindDir(tVFS_Node *Node, char *Name)
+tVFS_Node *TCP_Server_FindDir(tVFS_Node *Node, const char *Name)
{
tTCPConnection *conn;
tTCPListener *srv = Node->ImplPtr;
Log_Debug("TCP", "srv->ConnectionsTail = %p", srv->ConnectionsTail);
// Search
- LOCK( &srv->lConnections );
+ 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;
}
- RELEASE( &srv->lConnections );
+ SHORTREL( &srv->lConnections );
// If not found, ret NULL
if(!conn) {
*/
tVFS_Node *TCP_Client_Init(tInterface *Interface)
{
- tTCPConnection *conn = malloc( sizeof(tTCPConnection) );
+ tTCPConnection *conn = calloc( sizeof(tTCPConnection) + TCP_WINDOW_SIZE + TCP_WINDOW_SIZE/8, 1 );
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.IOCtl = TCP_Client_IOCtl;
conn->Node.Close = TCP_Client_Close;
- LOCK(&glTCP_OutbountCons);
+ conn->RecievedBuffer = RingBuffer_Create( TCP_RECIEVE_BUFFER_SIZE );
+ #if 0
+ conn->SentBuffer = RingBuffer_Create( TCP_SEND_BUFFER_SIZE );
+ Semaphore_Init(conn->SentBufferSpace, 0, TCP_SEND_BUFFER_SIZE, "TCP SentBuffer", conn->Name);
+ #endif
+
+ #if CACHE_FUTURE_PACKETS_IN_BYTES
+ // Future recieved data (ahead of the expected sequence number)
+ conn->FuturePacketData = (Uint8*)conn + sizeof(tTCPConnection);
+ conn->FuturePacketValidBytes = conn->FuturePacketData + TCP_WINDOW_SIZE;
+ #endif
+
+ SHORTLOCK(&glTCP_OutbountCons);
conn->Next = gTCP_OutbountCons;
gTCP_OutbountCons = conn;
- RELEASE(&glTCP_OutbountCons);
+ SHORTREL(&glTCP_OutbountCons);
return &conn->Node;
}
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 {State:%i}", conn, conn->State);
- // Check if connection is open
- while( conn->State == TCP_ST_HALFOPEN ) Threads_Yield();
- if( conn->State != TCP_ST_OPEN ) {
- LEAVE('i', 0);
- return 0;
- }
+ // Check if connection is estabilishing
+ // - TODO: Sleep instead (maybe using VFS_SelectNode to wait for the
+ // data to be availiable
+ while( conn->State == TCP_ST_SYN_RCVD || conn->State == TCP_ST_SYN_SENT )
+ Threads_Yield();
- // Poll packets
- for(;;)
+ // If the conneciton is not open, then clean out the recieved buffer
+ if( conn->State != TCP_ST_OPEN )
{
- // Lock list and check if there is a packet
- LOCK( &conn->lRecievedPackets );
- if( conn->RecievedBuffer->Length == 0 ) {
- // If not, release the lock, yield and try again
- RELEASE( &conn->lRecievedPackets );
- Threads_Yield();
- continue;
- }
+ Mutex_Acquire( &conn->lRecievedPackets );
+ 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)
- RELEASE( &conn->lRecievedPackets );
-
LEAVE('i', len);
return len;
}
+
+ // Wait
+ VFS_SelectNode(Node, VFS_SELECT_READ|VFS_SELECT_ERROR, NULL, "TCP_Client_Read");
+
+ // Lock list and read as much as possible (up to `Length`)
+ Mutex_Acquire( &conn->lRecievedPackets );
+ 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;
}
/**
packet->SourcePort = htons(Connection->LocalPort);
packet->DestPort = htons(Connection->RemotePort);
packet->DataOffset = (sizeof(tTCPHeader)/4)*16;
- packet->WindowSize = TCP_WINDOW_SIZE;
+ packet->WindowSize = htons(TCP_WINDOW_SIZE);
- //packet->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
- packet->AcknowlegementNumber = 0;
+ packet->AcknowlegementNumber = htonl(Connection->NextSequenceRcv);
packet->SequenceNumber = htonl(Connection->NextSequenceSend);
- packet->Flags = TCP_FLAG_PSH; // Hey, ACK if you can!
+ 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);
+#if HEXDUMP_OUTGOING
+ Debug_HexDump("TCP_INT_SendDataPacket: Data = ", Data, Length);
+#endif
+
TCP_SendPacket( Connection, sizeof(tTCPHeader)+Length, packet );
Connection->NextSequenceSend += Length;
ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
+// #if DEBUG
+// Debug_HexDump("TCP_Client_Write: Buffer = ",
+// Buffer, Length);
+// #endif
+
// Check if connection is open
- while( conn->State == TCP_ST_HALFOPEN ) Threads_Yield();
+ 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 )
+ do
{
- TCP_INT_SendDataPacket(conn, TCP_MAX_PACKET_SIZE, Buffer);
- Buffer += TCP_MAX_PACKET_SIZE;
- }
-
- TCP_INT_SendDataPacket(conn, rem, Buffer);
+ int len = (rem < TCP_MAX_PACKET_SIZE) ? rem : TCP_MAX_PACKET_SIZE;
+
+ #if 0
+ // Wait for space in the buffer
+ Semaphore_Signal( &Connection->SentBufferSpace, len );
+
+ // Save data to buffer (and update the length read by the ammount written)
+ len = RingBuffer_Write( &Connection->SentBuffer, Buffer, len);
+ #endif
+
+ // Send packet
+ TCP_INT_SendDataPacket(conn, len, Buffer);
+
+ Buffer += len;
+ rem -= len;
+ } while( rem > 0 );
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)
- return conn->LocalPort;
+ LEAVE_RET('i', conn->LocalPort);
if(conn->State != TCP_ST_CLOSED)
- return -1;
+ LEAVE_RET('i', -1);
if(!CheckMem(Data, sizeof(Uint16)))
- return -1;
+ LEAVE_RET('i', -1);
if(Threads_GetUID() != 0 && *(Uint16*)Data < 1024)
- return -1;
+ LEAVE_RET('i', -1);
conn->LocalPort = *(Uint16*)Data;
- return 0;
+ LEAVE_RET('i', conn->LocalPort);
case 5: // Get/Set remote port
- if(!Data) return conn->RemotePort;
- if(conn->State != TCP_ST_CLOSED) return -1;
- if(!CheckMem(Data, sizeof(Uint16))) return -1;
+ 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;
- return 0;
+ LEAVE_RET('i', conn->RemotePort);
case 6: // Set Remote IP
if( conn->State != TCP_ST_CLOSED )
- return -1;
+ LEAVE_RET('i', -1);
if( conn->Interface->Type == 4 )
{
- if(!CheckMem(Data, sizeof(tIPv4))) return -1;
+ 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))) return -1;
+ if(!CheckMem(Data, sizeof(tIPv6))) LEAVE_RET('i', -1);
conn->RemoteIP.v6 = *(tIPv6*)Data;
}
- return 0;
+ LEAVE_RET('i', 0);
case 7: // Connect
- if(conn->LocalPort == -1)
+ if(conn->LocalPort == 0xFFFF)
conn->LocalPort = TCP_GetUnusedPort();
if(conn->RemotePort == -1)
- return 0;
+ LEAVE_RET('i', 0);
- TCP_StartConnection(conn);
- return 1;
+ {
+ tTime timeout_end = now() + conn->Interface->TimeoutDelay;
+
+ TCP_StartConnection(conn);
+ // TODO: Wait for connection to open
+ while( conn->State == TCP_ST_SYN_SENT && timeout_end > now() ) {
+ Threads_Yield();
+ }
+ if( conn->State == TCP_ST_SYN_SENT )
+ LEAVE_RET('i', 0);
+ }
+
+ 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)
{
- free(Node->ImplPtr);
+ 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_SendPacket( conn, sizeof(tTCPHeader), &packet );
+ }
+
+ switch( conn->State )
+ {
+ case TCP_ST_CLOSE_WAIT:
+ conn->State = TCP_ST_LAST_ACK;
+ 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