Modules/IPStack/tcp.h

   1 /*
   2  * Acess2 IP Stack
   3  * - TCP Definitions
   4  */
   5 #ifndef _TCP_H_
   6 #define _TCP_H_
   7
   8 #include "ipstack.h"
   9
  10 typedef struct sTCPHeader       tTCPHeader;
  11 typedef struct sTCPListener     tTCPListener;
  12 typedef struct sTCPStoredPacket tTCPStoredPacket;
  13 typedef struct sTCPConnection   tTCPConnection;
  14
  15 struct sTCPHeader
  16 {
  17         Uint16  SourcePort;
  18         Uint16  DestPort;
  19         Uint32  SequenceNumber;
  20         Uint32  AcknowlegementNumber;
  21         #if 0
  22         struct {
  23                 unsigned Reserved:      4;
  24                 unsigned DataOffset: 4; // Size of the header in 32-bit words
  25         } __attribute__ ((packed));
  26         #else
  27         Uint8   DataOffset;
  28         #endif
  29         #if 0
  30         struct {        // Lowest to Highest
  31                 unsigned FIN:   1;      // Last packet
  32                 unsigned SYN:   1;      // Synchronise Sequence Numbers
  33                 unsigned RST:   1;      // Reset Connection
  34                 unsigned PSH:   1;      // Push Function
  35                 unsigned ACK:   1;      // Acknowlegement field is significant
  36                 unsigned URG:   1;      // Urgent pointer is significant
  37                 unsigned ECE:   1;      // ECN-Echo
  38                 unsigned CWR:   1;      // Congestion Window Reduced
  39         } __attribute__ ((packed)) Flags;
  40         #else
  41         Uint8   Flags;
  42         #endif
  43         Uint16  WindowSize;
  44
  45         Uint16  Checksum;
  46         Uint16  UrgentPointer;
  47
  48         Uint8   Options[];
  49 } __attribute__ ((packed));
  50
  51 enum eTCPFlags
  52 {
  53         TCP_FLAG_FIN    = 0x01,
  54         TCP_FLAG_SYN    = 0x02,
  55         TCP_FLAG_RST    = 0x04,
  56         TCP_FLAG_PSH    = 0x08,
  57         TCP_FLAG_ACK    = 0x10,
  58         TCP_FLAG_URG    = 0x20,
  59         TCP_FLAG_ECE    = 0x40,
  60         TCP_FLAG_CWR    = 0x80
  61 };
  62
  63 struct sTCPListener
  64 {
  65         struct sTCPListener     *Next;  //!< Next server in the list
  66         Uint16  Port;           //!< Listening port (0 disables the server)
  67         tInterface      *Interface;     //!< Listening Interface
  68         tVFS_Node       Node;   //!< Server Directory node
  69          int    NextID;         //!< Name of the next connection
  70         tSpinlock       lConnections;   //!< Spinlock for connections
  71         tTCPConnection  *Connections;   //!< Connections (linked list)
  72          tTCPConnection *volatile NewConnections;
  73 };
  74
  75 struct sTCPStoredPacket
  76 {
  77         struct sTCPStoredPacket *Next;
  78         size_t  Length;
  79         Uint32  Sequence;
  80         Uint8   Data[];
  81 };
  82
  83 struct sTCPConnection
  84 {
  85         struct sTCPConnection   *Next;
  86          int    State;  //!< Connection state (see ::eTCPConnectionState)
  87         Uint16  LocalPort;      //!< Local port
  88         Uint16  RemotePort;     //!< Remote port
  89         tInterface      *Interface;     //!< Listening Interface
  90         tVFS_Node       Node;   //!< Node
  91
  92          int    NextSequenceSend;       //!< Next sequence value for outbound packets
  93          int    NextSequenceRcv;        //!< Next expected sequence value for inbound
  94
  95         /**
  96          * \brief Non-ACKed packets
  97          * \note FIFO list
  98          * \{
  99          */
 100         tSpinlock       lQueuedPackets;
 101         tTCPStoredPacket        *QueuedPackets; //!< Non-ACKed packets
 102         /**
 103          * \}
 104          */
 105
 106         /**
 107          * \brief Unread Packets
 108          * \note Double ended list (fifo)
 109          * \{
 110          */
 111         tSpinlock       lRecievedPackets;
 112         tTCPStoredPacket        *RecievedPackets;       //!< Unread Packets
 113         tTCPStoredPacket        *RecievedPacketsTail;   //!< Unread Packets (End of list)
 114         /**
 115          * \}
 116          */
 117
 118         /**
 119          * \brief Out of sequence packets
 120          * \note Sorted list to improve times
 121          * \{
 122          */
 123         tSpinlock       lFuturePackets; //!< Future packets spinlock
 124         tTCPStoredPacket        *FuturePackets; //!< Out of sequence packets
 125         /**
 126          * \}
 127          */
 128
 129         union {
 130                 tIPv4   v4;
 131                 tIPv6   v6;
 132         } RemoteIP;     //!< Remote IP Address
 133         // Type is determined by LocalInterface->Type
 134 };
 135
 136 enum eTCPConnectionState
 137 {
 138         TCP_ST_CLOSED,
 139         TCP_ST_HALFOPEN,
 140         TCP_ST_OPEN
 141 };
 142
 143 #endif