* - 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_Open(tInterface *Interface, Uint16 LocalPort, void *Address, Uint16 Port);
+void TCP_StartConnection(tTCPConnection *Conn);
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);
// === 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;
{
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
*/
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
- // Send a TCP SYN to the target to open the connection
+ 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:
+ 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, buflen );
+ Data->Checksum = IPv4_Checksum( buf, buflen );
+ free(buf);
+ IPv4_SendPacket(Conn->Interface, Conn->RemoteIP.v4, IP4PROT_TCP, 0, sizeof(tTCPHeader), &hdr);
+ break;
+ }
+}
+
/**
* \fn void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
* \brief Handles a packet from the IP Layer
tTCPListener *srv;
tTCPConnection *conn;
+ Log("[TCP ] sizeof(tTCPHeader) = %i", sizeof(tTCPHeader));
+ Log("[TCP ] DestPort = %i", ntohs(hdr->DestPort));
+ Log("[TCP ] DestPort = %i", ntohs(hdr->DestPort));
+ Log("[TCP ] SequenceNumber = %i", ntohl(hdr->SequenceNumber));
+ Log("[TCP ] AcknowlegementNumber = %i", 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
continue;
// We have a response!
- //TODO
+ TCP_INT_HandleConnectionPacket(conn, hdr)
return;
}
{
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 != 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
// --- Server
tVFS_Node *TCP_Server_Init(tInterface *Interface)
{
- return NULL;
+ 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)
{
- return NULL;
+ 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, conn->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)
{
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;
}
switch(ID)
{
- case 5: // Get/Set local port
+ case 4: // Get/Set local port
if(!Data)
return conn->LocalPort;
if(conn->State != TCP_ST_CLOSED)
conn->LocalPort = *(Uint16*)Data;
return 0;
- case 6: // Get/Set remote port
+ 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 7: // Set Remote IP
+ case 6: // Set Remote IP
if( conn->State != TCP_ST_CLOSED )
return -1;
if( conn->Interface->Type == 4 )
}
return 0;
- case 8: // Connect
+ case 7: // Connect
if(conn->LocalPort == -1)
conn->LocalPort = TCP_GetUnusedPort();
if(conn->RemotePort == -1)
git.ucc.asn.au / tpg / acess2.git / blobdiff
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