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Rev 129 Rev 384
Line 12... Line 12...
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;;  v0.6 : Added reset handling in the established state           ;;
 12 
;;  v0.6 : Added reset handling in the established state           ;;
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;;         Added a timer per socket to allow delays when rx window ;;
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;;         Added a timer per socket to allow delays when rx window ;;
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;;         gets below 1KB                                          ;;
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;;         gets below 1KB                                          ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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- 
 
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; TCP TCB states
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TCB_LISTEN         equ        1
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TCB_SYN_SENT       equ        2
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TCB_SYN_RECEIVED   equ        3
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TCB_ESTABLISHED    equ        4
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TCB_FIN_WAIT_1     equ        5
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TCB_FIN_WAIT_2     equ        6
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TCB_CLOSE_WAIT     equ        7
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TCB_CLOSING        equ        8
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TCB_LAST_ACK       equ        9
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TCB_TIME_WAIT      equ        10
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TCB_CLOSED         equ        11
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- 
 
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TWOMSL              equ     10      ; # of secs to wait before closing socket
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TCP_RETRIES         equ         5               ; Number of times to resend a packet
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TCP_TIMEOUT         equ         10              ; resend if not replied to in x hs
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;*******************************************************************
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;*******************************************************************
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;   Interface
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;   Interface
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;       tcp_tcb_handler     1s timer, to erase tcb's in TIME_WAIT state
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;       tcp_tcb_handler     1s timer, to erase tcb's in TIME_WAIT state
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;
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;
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;*******************************************************************
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;*******************************************************************
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;   TCP Payload ( Data field in IP datagram )
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;
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;    0                   1                   2                   3
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;    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;20 |          Source Port          |       Destination Port        |
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;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;24 |                        Sequence Number                        |
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;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;28 |                    Acknowledgment Number                      |
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;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;32 |  Data |           |U|A|P|R|S|F|                               |
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;   | Offset| Reserved  |R|C|S|S|Y|I|            Window             |
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;   |       |           |G|K|H|T|N|N|                               |
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;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;36 |           Checksum            |         Urgent Pointer        |
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;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;40 |                    Options                    |    Padding    |
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;   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;   |                             data
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struc TCP_PACKET
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{  .SourcePort       dw  ?  ;+00
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   .DestinationPort  dw  ?  ;+02
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   .SequenceNumber   dd  ?  ;+04
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   .AckNumber        dd  ?  ;+08
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   .DataOffset       db  ?  ;+12 - DataOffset[0-3 bits] and Reserved[4-7]
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   .Flags            db  ?  ;+13 - Reserved[0-1 bits]|URG|ACK|PSH|RST|SYN|FIN
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   .Window           dw  ?  ;+14
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   .Checksum         dw  ?  ;+16
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   .UrgentPointer    dw  ?  ;+18
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   .Options          rb  3  ;+20
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   .Padding          db  ?  ;+23
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   .Data             db  ?  ;+24
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}
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virtual at 0
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  TCP_PACKET TCP_PACKET
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end virtual
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;***************************************************************************
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;***************************************************************************
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    mov     [edx + 20 + 16], ah
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    mov     [edx + 20 + 16], ah
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    mov     [edx + 20 + 17], al
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    mov     [edx + 20 + 17], al
495 
 
 - 
 
496 
    ; Fill in the IP header checksum
 - 
 
497 
    mov     eax, edx
 554 
 
498 
    mov     [checkAdd1], eax
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499 
    mov     [checkSize1], word 20
 555 
    ; Fill in the IP header checksum
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    mov     [checkAdd2], dword 0
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    mov     [checkSize2], word 0
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 - 
 
503 
    call    checksum
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    GET_IHL eax,edx              ; get IP-Header length
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    stdcall checksum_jb,edx,eax  ; buf_ptr, buf_size
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    mov     ax, [checkResult]
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    rep     movsb          ; copy the data across
 1055 
    rep     movsb          ; copy the data across
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1003 
 
 1056 
 
1004 
    ; flag an event to the application
 1057 
    ; flag an event to the application
1005 
    pop     eax
 1058 
    pop     eax
1006 
    mov     ecx,1
 1059 
    mov     ecx,1
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1007 
    mov     esi,0x3020+TASKDATA.pid
 1060 
    mov     esi,TASK_DATA+TASKDATA.pid
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 1061 
 
1009 
news:
 1062 
news:
1010 
    cmp     [esi],eax
 1063 
    cmp     [esi],eax
1011 
    je      foundPID1
 1064 
    je      foundPID1
1012 
    inc     ecx
 1065 
    inc     ecx
1013 
    add     esi,0x20
 1066 
    add     esi,0x20
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1014 
    cmp     ecx,[0x3004]
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    cmp     ecx,[TASK_COUNT]
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    jbe     news
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    jbe     news
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 1069 
 
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1017 
foundPID1:
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foundPID1:
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1018 
    shl     ecx,8
 1071 
    shl     ecx,8
1019 
    or      dword [ecx+0x80000+APPDATA.event_mask],dword 10000000b ; stack event
 1072 
    or      dword [ecx+SLOT_BASE+APPDATA.event_mask],dword 10000000b ; stack event