+++ /dev/null
-/*
- * Acess2 IP Stack
- * - TCP Handling
- */
-#include "ipstack.h"
-#include "ipv4.h"
-#include "tcp.h"
-
-#define TCP_MIN_DYNPORT 0x1000
-#define TCP_MAX_HALFOPEN 1024 // Should be enough
-
-// === PROTOTYPES ===
-void TCP_Initialise();
-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);
-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, 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);
-
-// === TEMPLATES ===
-tSocketFile gTCP_ServerFile = {NULL, "tcps", TCP_Server_Init};
-tSocketFile gTCP_ClientFile = {NULL, "tcpc", TCP_Client_Init};
-
-// === GLOBALS ===
- int giTCP_NumHalfopen = 0;
-tSpinlock glTCP_Listeners;
-tTCPListener *gTCP_Listeners;
-tSpinlock 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
- */
-void TCP_Initialise()
-{
- IPStack_AddFile(&gTCP_ServerFile);
- IPStack_AddFile(&gTCP_ClientFile);
- IPv4_RegisterCallback(IP4PROT_TCP, TCP_GetPacket);
-}
-
-/**
- * \brief Open a connection to another host using TCP
- */
-void TCP_StartConnection(tTCPConnection *Conn)
-{
- tTCPHeader hdr;
-
- hdr.SourcePort = Conn->LocalPort;
- hdr.DestPort = Conn->RemotePort;
- Conn->NextSequenceSend = rand();
- hdr.SequenceNumber = Conn->NextSequenceSend;
- hdr.DataOffset = (sizeof(tTCPHeader)+3)/4;
- hdr.Flags = TCP_FLAG_SYN;
- hdr.WindowSize = 0; // TODO
- hdr.Checksum = 0; // TODO
- hdr.UrgentPointer = 0;
- // SEND PACKET
- TCP_SendPacket( Conn, sizeof(tTCPHeader), &hdr );
- return ;
-}
-
-/**
- * \brief Sends a packet from the specified connection, calculating the checksums
- * \param Conn Connection
- * \param Length Length of data
- * \param Data Packet data
- */
-void TCP_SendPacket( tTCPConnection *Conn, size_t Length, tTCPHeader *Data )
-{
- 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] = 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);
- IPv4_SendPacket(Conn->Interface, Conn->RemoteIP.v4, IP4PROT_TCP, 0, buflen, buf);
- break;
- }
-}
-
-/**
- * \fn void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
- * \brief Handles a packet from the IP Layer
- */
-void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
-{
- tTCPHeader *hdr = Buffer;
- tTCPListener *srv;
- tTCPConnection *conn;
-
- Log("[TCP ] sizeof(tTCPHeader) = %i", sizeof(tTCPHeader));
- Log("[TCP ] SourcePort = %i", ntohs(hdr->SourcePort));
- Log("[TCP ] DestPort = %i", ntohs(hdr->DestPort));
- Log("[TCP ] SequenceNumber = 0x%x", ntohl(hdr->SequenceNumber));
- Log("[TCP ] AcknowlegementNumber = 0x%x", ntohl(hdr->AcknowlegementNumber));
- Log("[TCP ] DataOffset = %i", hdr->DataOffset >> 4);
- Log("[TCP ] Flags = {");
- Log("[TCP ] CWR = %B", !!(hdr->Flags & TCP_FLAG_CWR));
- Log("[TCP ] ECE = %B", !!(hdr->Flags & TCP_FLAG_ECE));
- Log("[TCP ] URG = %B", !!(hdr->Flags & TCP_FLAG_URG));
- Log("[TCP ] ACK = %B", !!(hdr->Flags & TCP_FLAG_ACK));
- Log("[TCP ] PSH = %B", !!(hdr->Flags & TCP_FLAG_PSH));
- Log("[TCP ] RST = %B", !!(hdr->Flags & TCP_FLAG_RST));
- Log("[TCP ] SYN = %B", !!(hdr->Flags & TCP_FLAG_SYN));
- Log("[TCP ] FIN = %B", !!(hdr->Flags & TCP_FLAG_FIN));
- Log("[TCP ] }");
- Log("[TCP ] WindowSize = %i", htons(hdr->WindowSize));
- Log("[TCP ] Checksum = 0x%x", htons(hdr->Checksum));
- Log("[TCP ] UrgentPointer = 0x%x", htons(hdr->UrgentPointer));
-
- // 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;
-
- // Is this in an established connection?
- for( conn = srv->Connections; conn; conn = conn->Next )
- {
- // Check that it is coming in on the same interface
- if(conn->Interface != Interface) continue;
-
- // Check Source Port
- if(conn->RemotePort != 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;
-
- // We have a response!
- TCP_INT_HandleConnectionPacket(conn, hdr);
-
- return;
- }
-
- // Open a new connection (well, check that it's a SYN)
- if(hdr->Flags != TCP_FLAG_SYN) {
- Log("[TCP ] Packet is not a SYN");
- continue;
- }
-
- conn = calloc(1, sizeof(tTCPConnection));
- conn->State = TCP_ST_HALFOPEN;
- conn->LocalPort = srv->Port;
- conn->RemotePort = hdr->SourcePort;
- conn->Interface = Interface;
-
- switch(Interface->Type)
- {
- case 4: conn->RemoteIP.v4 = *(tIPv4*)Address; break;
- case 6: conn->RemoteIP.v6 = *(tIPv6*)Address; break;
- }
-
- conn->NextSequenceRcv = ntohl( hdr->SequenceNumber );
- conn->NextSequenceSend = rand();
-
- // Create node
- conn->Node.NumACLs = 1;
- conn->Node.ACLs = &gVFS_ACL_EveryoneRW;
- 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
- LOCK(&srv->lConnections);
- conn->Next = srv->Connections;
- srv->Connections = conn;
- RELEASE(&srv->lConnections);
-
- // Send the SYN ACK
- Log("[TCP ] TODO: Sending SYN ACK");
- hdr->Flags |= TCP_FLAG_ACK;
- hdr->AcknowlegementNumber = hdr->SequenceNumber;
- hdr->SequenceNumber = conn->NextSequenceSend;
- hdr->DestPort = hdr->SourcePort;
- hdr->SourcePort = srv->Port;
- TCP_SendPacket( conn, sizeof(tTCPHeader), hdr );
-
- break;
- }
- }
-
-
- // Check Open Connections
- {
- for( conn = gTCP_OutbountCons; conn; conn = conn->Next )
- {
- // Check that it is coming in on the same interface
- if(conn->Interface != Interface) continue;
-
- // Check Source Port
- if(conn->RemotePort != 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);
- }
- }
-}
-
-/**
- * \brief Handles a packet sent to a specific connection
- */
-void TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header)
-{
-
-}
-
-/**
- * \fn Uint16 TCP_GetUnusedPort()
- * \brief Gets an unused port and allocates it
- */
-Uint16 TCP_GetUnusedPort()
-{
- Uint16 ret;
-
- // Get Next outbound port
- ret = giTCP_NextOutPort++;
- while( gaTCP_PortBitmap[ret/32] & (1 << (ret%32)) )
- {
- ret ++;
- giTCP_NextOutPort++;
- if(giTCP_NextOutPort == 0x10000) {
- ret = giTCP_NextOutPort = TCP_MIN_DYNPORT;
- }
- }
-
- // Mark the new port as used
- gaTCP_PortBitmap[ret/32] |= 1 << (ret%32);
-
- return ret;
-}
-
-/**
- * \fn int TCP_AllocatePort(Uint16 Port)
- * \brief Marks a port as used
- */
-int TCP_AllocatePort(Uint16 Port)
-{
- // 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;
-}
-
-/**
- * \fn int TCP_DeallocatePort(Uint16 Port)
- * \brief Marks a port as unused
- */
-int TCP_DeallocatePort(Uint16 Port)
-{
- // 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 = malloc( sizeof(tTCPListener) );
-
- srv->Interface = Interface;
- srv->Port = 0;
- srv->NextID = 0;
- srv->Connections = NULL;
- srv->Next = NULL;
- 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;
-
- LOCK(&glTCP_Listeners);
- srv->Next = gTCP_Listeners;
- gTCP_Listeners = srv;
- RELEASE(&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;
-
- while( srv->NewConnections == NULL ) Threads_Yield();
-
- conn = srv->NewConnections;
- srv->NewConnections = conn->Next;
-
- ret = malloc(9);
- itoa(ret, Node->ImplInt, 16, '0', 8);
- 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, char *Name)
-{
- return NULL;
-}
-
-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);
- return srv->Port;
- }
- return 0;
-}
-
-void TCP_Server_Close(tVFS_Node *Node)
-{
- free(Node->ImplPtr);
-}
-
-// --- Client
-tVFS_Node *TCP_Client_Init(tInterface *Interface)
-{
- tTCPConnection *conn = malloc( sizeof(tTCPConnection) );
-
- conn->State = TCP_ST_CLOSED;
- conn->Interface = Interface;
- conn->LocalPort = 0;
- conn->RemotePort = 0;
- 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;
-
- LOCK(&glTCP_OutbountCons);
- conn->Next = gTCP_OutbountCons;
- gTCP_OutbountCons = conn;
- RELEASE(&glTCP_OutbountCons);
-
- return &conn->Node;
-}
-
-Uint64 TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
-{
- return 0;
-}
-
-Uint64 TCP_Client_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
-{
- return 0;
-}
-
-/**
- * \brief Control a client socket
- */
-int TCP_Client_IOCtl(tVFS_Node *Node, int ID, void *Data)
-{
- tTCPConnection *conn = Node->ImplPtr;
-
- switch(ID)
- {
- case 4: // Get/Set local port
- if(!Data)
- return conn->LocalPort;
- if(conn->State != TCP_ST_CLOSED)
- return -1;
- if(!CheckMem(Data, sizeof(Uint16)))
- return -1;
-
- if(Threads_GetUID() != 0 && *(Uint16*)Data < 1024)
- return -1;
-
- conn->LocalPort = *(Uint16*)Data;
- return 0;
-
- 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;
- conn->RemotePort = *(Uint16*)Data;
- return 0;
-
- case 6: // Set Remote IP
- if( conn->State != TCP_ST_CLOSED )
- return -1;
- if( conn->Interface->Type == 4 )
- {
- if(!CheckMem(Data, sizeof(tIPv4))) return -1;
- conn->RemoteIP.v4 = *(tIPv4*)Data;
- }
- else if( conn->Interface->Type == 6 )
- {
- if(!CheckMem(Data, sizeof(tIPv6))) return -1;
- conn->RemoteIP.v6 = *(tIPv6*)Data;
- }
- return 0;
-
- case 7: // Connect
- if(conn->LocalPort == -1)
- conn->LocalPort = TCP_GetUnusedPort();
- if(conn->RemotePort == -1)
- return 0;
-
- TCP_StartConnection(conn);
- return 1;
- }
-
- return 0;
-}
-
-void TCP_Client_Close(tVFS_Node *Node)
-{
- free(Node->ImplPtr);
-}
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