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 sTCPConnection   tTCPConnection;
  13
  14 struct sTCPHeader
  15 {
  16         Uint16  SourcePort;
  17         Uint16  DestPort;
  18         Uint32  SequenceNumber;
  19         Uint32  AcknowlegementNumber;
  20         #if 0
  21         struct {
  22                 unsigned Reserved:      4;
  23                 unsigned DataOffset: 4; // Size of the header in 32-bit words
  24         } __attribute__ ((packed));
  25         #else
  26         Uint8   DataOffset;
  27         #endif
  28         #if 0
  29         struct {        // Lowest to Highest
  30                 unsigned FIN:   1;      // Last packet
  31                 unsigned SYN:   1;      // Synchronise Sequence Numbers
  32                 unsigned RST:   1;      // Reset Connection
  33                 unsigned PSH:   1;      // Push Function
  34                 unsigned ACK:   1;      // Acknowlegement field is significant
  35                 unsigned URG:   1;      // Urgent pointer is significant
  36                 unsigned ECE:   1;      // ECN-Echo
  37                 unsigned CWR:   1;      // Congestion Window Reduced
  38         } __attribute__ ((packed)) Flags;
  39         #else
  40         Uint8   Flags;
  41         #endif
  42         Uint16  WindowSize;
  43
  44         Uint16  Checksum;
  45         Uint16  UrgentPointer;
  46
  47         Uint8   Options[];
  48 } __attribute__ ((packed));
  49
  50 enum eTCPFlags
  51 {
  52         TCP_FLAG_FIN    = 0x01,
  53         TCP_FLAG_SYN    = 0x02,
  54         TCP_FLAG_RST    = 0x04,
  55         TCP_FLAG_PSH    = 0x08,
  56         TCP_FLAG_ACK    = 0x10,
  57         TCP_FLAG_URG    = 0x20,
  58         TCP_FLAG_ECE    = 0x40,
  59         TCP_FLAG_CWR    = 0x80
  60 };
  61
  62 struct sTCPListener
  63 {
  64         struct sTCPListener     *Next;
  65         Uint16  Port;
  66         tInterface      *Interface;
  67         tVFS_Node       Node;
  68          int    NextID;
  69         tTCPConnection  *Connections;
  70 };
  71
  72 struct sTCPConnection
  73 {
  74         struct sTCPConnection   *Next;
  75          int    State;
  76         Uint16  LocalPort;
  77         Uint16  RemotePort;
  78         tVFS_Node       Node;
  79
  80          int    NextSequenceSend;
  81          int    NextSequenceRcv;
  82
  83          int    nQueuedPackets;
  84         struct {
  85                  int    Sequence;
  86                 void    *Data;
  87         }       *QueuedPackets;
  88
  89
  90          int    nFuturePackets;
  91         struct {
  92                  int    SequenceNum;
  93                 void    *Data;
  94         }       **FuturePackets;
  95
  96         tInterface      *Interface;
  97         union {
  98                 tIPv4   v4;
  99                 tIPv6   v6;
 100         } RemoteIP;     // Type is determined by LocalInterface->Type
 101 };
 102
 103 enum eTCPConnectionState
 104 {
 105         TCP_ST_CLOSED,
 106         TCP_ST_HALFOPEN,
 107         TCP_ST_OPEN
 108 };
 109
 110 #endif