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         struct {
  21                 unsigned DataOffset: 4; // Size of the header in 32-bit words
  22                 unsigned Reserved:      4;
  23         };
  24         struct {
  25                 unsigned CWR:   1;      // Congestion Window Reduced
  26                 unsigned ECE:   1;      // ECN-Echo
  27                 unsigned URG:   1;      // Urgent pointer is significant
  28                 unsigned ACK:   1;      // Acknowlegement field is significant
  29                 unsigned PSH:   1;      // Push Function
  30                 unsigned RST:   1;      // Reset Connection
  31                 unsigned SYN:   1;      // Synchronise Sequence Numbers
  32                 unsigned FIN:   1;      // Last packet
  33         } Flags;
  34         Uint16  WindowSize;
  35
  36         Uint16  Checksum;
  37         Uint16  UrgentPointer;
  38
  39         Uint8   Options[];
  40 };
  41
  42 struct sTCPListener
  43 {
  44         struct sTCPListener     *Next;
  45         Uint16  Port;
  46         tInterface      *Interface;
  47         tTCPConnection  *Connections;
  48 };
  49
  50 struct sTCPConnection
  51 {
  52         struct sTCPConnection   *Next;
  53          int    State;
  54         Uint16  LocalPort;
  55         Uint16  RemotePort;
  56         tVFS_Node       Node;
  57
  58         tInterface      *Interface;
  59         union {
  60                 tIPv4   v4;
  61                 tIPv6   v6;
  62         } RemoteIP;     // Type is determined by LocalInterface->Type
  63 };
  64
  65 enum eTCPConnectionState
  66 {
  67         TCP_ST_CLOSED,
  68         TCP_ST_HALFOPEN,
  69         TCP_ST_OPEN
  70 };
  71
  72 #endif