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;;                                                                 ;;

;; Copyright (C) KolibriOS team 2004-2013. All rights reserved.    ;;

;; Distributed under terms of the GNU General Public License       ;;

;;                                                                 ;;

;;  Part of the TCP/IP network stack for KolibriOS                 ;;

;;                                                                 ;;

;;   Written by hidnplayr@kolibrios.org                            ;;

;;                                                                 ;;

;;    Based on the code of 4.4BSD                                  ;;

;;                                                                 ;;

;;          GNU GENERAL PUBLIC LICENSE                             ;;

;;             Version 2, June 1991                                ;;

;;                                                                 ;;

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$Revision: 3406 $

; Socket states

TCPS_CLOSED             = 0

TCPS_LISTEN             = 1

TCPS_SYN_SENT           = 2

TCPS_SYN_RECEIVED       = 3

TCPS_ESTABLISHED        = 4

TCPS_CLOSE_WAIT         = 5

TCPS_FIN_WAIT_1         = 6

TCPS_CLOSING            = 7

TCPS_LAST_ACK           = 8

TCPS_FIN_WAIT_2         = 9

TCPS_TIMED_WAIT         = 10

; Socket Flags

TF_ACKNOW               = 1 shl 0     ; ack peer immediately

TF_DELACK               = 1 shl 1     ; ack, but try to delay it

TF_NODELAY              = 1 shl 2     ; don't delay packets to coalesce

TF_NOOPT                = 1 shl 3     ; don't use tcp options

TF_SENTFIN              = 1 shl 4     ; have sent FIN

TF_REQ_SCALE            = 1 shl 5     ; have/will request window scaling

TF_RCVD_SCALE           = 1 shl 6     ; other side has requested scaling

TF_REQ_TSTMP            = 1 shl 7     ; have/will request timestamps

TF_RCVD_TSTMP           = 1 shl 8     ; a timestamp was received in SYN

TF_SACK_PERMIT          = 1 shl 9     ; other side said I could SACK

; Segment flags

TH_FIN                  = 1 shl 0

TH_SYN                  = 1 shl 1

TH_RST                  = 1 shl 2

TH_PUSH                 = 1 shl 3

TH_ACK                  = 1 shl 4

TH_URG                  = 1 shl 5

; Segment header options

TCP_OPT_EOL             = 0           ; End of option list.

TCP_OPT_NOP             = 1           ; No-Operation.

TCP_OPT_MAXSEG          = 2           ; Maximum Segment Size.

TCP_OPT_WINDOW          = 3           ; window scale

TCP_OPT_SACK_PERMIT     = 4           ; Selective Acknowledgement

TCP_OPT_SACK            = 5

TCP_OPT_TIMESTAMP       = 8

; Fundamental timer values

TCP_time_MSL            = 47          ; max segment lifetime (30s)

TCP_time_re_min         = 2           ; min retransmission (1,28s)

TCP_time_re_max         = 100         ; max retransmission (64s)

TCP_time_pers_min       = 8           ; min persist (5,12s)

TCP_time_pers_max       = 94          ; max persist (60,16s)

TCP_time_keep_init      = 118         ; connection establishment (75,52s)

TCP_time_keep_idle      = 4608        ; idle time before 1st probe (2h)

TCP_time_keep_interval  = 118         ; between probes when no response (75,52s)

TCP_time_rtt_default    = 5           ; default Round Trip Time (3,2s)

TCP_time_srtt_default   = 0           ;

TCP_time_max_idle       = 8*TCP_time_keep_interval      ; FIXME

; timer constants

TCP_max_rxtshift        = 12          ; max retransmissions waiting for ACK

TCP_max_keepcnt         = 8           ; max keepalive probes

;

TCP_max_winshift        = 14

TCP_max_win             = 65535

TCP_re_xmit_thresh      = 3

TCP_mss_default         = 1480        ; default max segment size

; smoothed round trip time and estimated variance are stored as fixed point numbers,

; shifted by the value below.

; With these scales, srtt has 3 bits to the right of the binary point, and thus an "alpha"

; of .875. rttvar has 2 bits to the right and thus "alpha" of 0.75

TCP_RTT_SHIFT           = 3

TCP_RTTVAR_SHIFT        = 2

; bits used by tcp_input and tcp_output

TCP_BIT_NEEDOUTPUT      = 1 shl 0

TCP_BIT_TIMESTAMP       = 1 shl 1

TCP_BIT_DROPSOCKET      = 1 shl 2

TCP_BIT_SENDALOT        = 1 shl 0

TCP_PAWS_IDLE           = 24*24*60*60*100       ; 24 days, in 1/100 seconds

TCP_QUEUE_SIZE          = 50

struct  TCP_header

        SourcePort              dw ?

        DestinationPort         dw ?

        SequenceNumber          dd ?

        AckNumber               dd ?

        DataOffset              db ?    ; DataOffset[0-3 bits] and Reserved[4-7]

        Flags                   db ?    ; Reserved[0-1 bits]|URG|ACK|PSH|RST|SYN|FIN

        Window                  dw ?

        Checksum                dw ?

        UrgentPointer           dw ?

ends

struct  TCP_queue_entry

        ip_ptr          dd ?

        segment_ptr     dd ?

        segment_size    dd ?

        device_ptr      dd ?

        buffer_ptr      dd ?

        timestamp       dd ?

ends

align 4

uglobal

        TCP_segments_tx         rd MAX_NET_DEVICES

        TCP_segments_rx         rd MAX_NET_DEVICES

        TCP_segments_missed     rd MAX_NET_DEVICES

        TCP_segments_dumped     rd MAX_NET_DEVICES

;        TCP_bytes_rx            rq MAX_NET_DEVICES

;        TCP_bytes_tx            rq MAX_NET_DEVICES

        TCP_sequence_num        dd ?

        TCP_queue               rd TCP_QUEUE_SIZE*sizeof.TCP_queue_entry/4

        TCP_input_event         dd ?

endg

;-----------------------------------------------------------------

;

; TCP_init

;

;  This function resets all TCP variables

;

;-----------------------------------------------------------------

macro   TCP_init {

        xor     eax, eax

        mov     edi, TCP_segments_tx

        mov     ecx, (6*MAX_NET_DEVICES)

        rep     stosd

        pseudo_random   eax

        mov     [TCP_sequence_num], eax

        init_queue TCP_queue

        push    1

        pop     ebx

        mov     ecx, TCP_process_input

        call    new_sys_threads

}

include 'tcp_timer.inc'

include 'tcp_subr.inc'

include 'tcp_usreq.inc'

include 'tcp_input.inc'

include 'tcp_output.inc'

;---------------------------------------------------------------------------

;

; TCP_API

;

; This function is called by system function 76

;

; IN:  subfunction number in bl

;      device number in bh

;      ecx, edx, .. depends on subfunction

;

; OUT:

;

;---------------------------------------------------------------------------

align 4

TCP_api:

        movzx   eax, bh

        shl     eax, 2

        test    bl, bl

        jz      .packets_tx     ; 0

        dec     bl

        jz      .packets_rx     ; 1

        dec     bl

        jz      .packets_missed ; 2

        dec     bl

        jz      .packets_dumped ; 3

  .error:

        mov     eax, -1

        ret

  .packets_tx:

        mov     eax, [TCP_segments_tx + eax]

        ret

  .packets_rx:

        mov     eax, [TCP_segments_rx + eax]

        ret

  .packets_missed:

        mov     eax, [TCP_segments_missed + eax]

        ret

  .packets_dumped:

        mov     eax, [TCP_segments_dumped + eax]

        ret