kolibrios/kernel/branches/net/network/tcp.inc

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                                                 ;;
;; Copyright (C) KolibriOS team 2004-2012. 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                                ;;
;;                                                                 ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

$Revision$

; Socket states
TCPS_CLOSED             equ 0
TCPS_LISTEN             equ 1
TCPS_SYN_SENT           equ 2
TCPS_SYN_RECEIVED       equ 3
TCPS_ESTABLISHED        equ 4
TCPS_CLOSE_WAIT         equ 5
TCPS_FIN_WAIT_1         equ 6
TCPS_CLOSING            equ 7
TCPS_LAST_ACK           equ 8
TCPS_FIN_WAIT_2         equ 9
TCPS_TIMED_WAIT         equ 10

; Socket Flags
TF_ACKNOW               equ 1 shl 0     ; ack peer immediately
TF_DELACK               equ 1 shl 1     ; ack, but try to delay it
TF_NODELAY              equ 1 shl 2     ; don't delay packets to coalesce
TF_NOOPT                equ 1 shl 3     ; don't use tcp options
TF_SENTFIN              equ 1 shl 4     ; have sent FIN
TF_REQ_SCALE            equ 1 shl 5     ; have/will request window scaling
TF_RCVD_SCALE           equ 1 shl 6     ; other side has requested scaling
TF_REQ_TSTMP            equ 1 shl 7     ; have/will request timestamps
TF_RCVD_TSTMP           equ 1 shl 8     ; a timestamp was received in SYN
TF_SACK_PERMIT          equ 1 shl 9     ; other side said I could SACK

; Segment flags
TH_FIN                  equ 1 shl 0
TH_SYN                  equ 1 shl 1
TH_RST                  equ 1 shl 2
TH_PUSH                 equ 1 shl 3
TH_ACK                  equ 1 shl 4
TH_URG                  equ 1 shl 5

; Segment header options
TCP_OPT_EOL             equ 0           ; End of option list.
TCP_OPT_NOP             equ 1           ; No-Operation.
TCP_OPT_MAXSEG          equ 2           ; Maximum Segment Size.
TCP_OPT_WINDOW          equ 3           ; window scale
TCP_OPT_TIMESTAMP       equ 8

; Fundamental timer values
TCP_time_MSL            equ 47          ; max segment lifetime (30s)
TCP_time_re_min         equ 2           ; min retransmission (1,28s)
TCP_time_re_max         equ 100         ; max retransmission (64s)
TCP_time_pers_min       equ 8           ; min persist (5,12s)
TCP_time_pers_max       equ 94          ; max persist (60,16s)
TCP_time_keep_init      equ 118         ; connectione stablishment (75,52s)
TCP_time_keep_idle      equ 4608        ; idle time before 1st probe (2h)
TCP_time_keep_interval  equ 118         ; between probes when no response (75,52s)
TCP_time_rtt_default    equ 5           ; default Round Trip Time (3,2s)
TCP_time_srtt_default   equ 0           ;

; timer constants
TCP_max_rxtshift        equ 12          ; max retransmissions waiting for ACK
TCP_max_keepcnt         equ 8           ; max keepalive probes

;
TCP_max_winshift        equ 14
TCP_max_win             equ 65535

TCP_re_xmit_thresh      equ 3

TCP_mss_default         equ 1480        ; default max segment size

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

align 4
uglobal
        TCP_headers_tx          rd IP_MAX_INTERFACES
        TCP_headers_rx          rd IP_MAX_INTERFACES
        TCP_bytes_rx            rq IP_MAX_INTERFACES
        TCP_bytes_tx            rq IP_MAX_INTERFACES
        TCP_sequence_num        dd ?
endg


;-----------------------------------------------------------------
;
; TCP_init
;
;  This function resets all TCP variables
;
;-----------------------------------------------------------------
macro   TCP_init {

        xor     eax, eax
        mov     edi, TCP_headers_tx
        mov     ecx, (6*IP_MAX_INTERFACES)
        rep     stosd

        pseudo_random   eax
        mov     [TCP_sequence_num], eax

}


include 'tcp_timer.inc'
include 'tcp_subr.inc'
include 'tcp_input.inc'
include 'tcp_output.inc'


;---------------------------------------------------------------------------
;
; TCP_API
;
; This function is called by system function 75
;
; 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

.error:
        mov     eax, -1
        ret

.packets_tx:
        add     eax, TCP_headers_tx
        mov     eax, [eax]
        ret

.packets_rx:
        add     eax, TCP_headers_rx
        mov     eax, [eax]
        ret