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kolibrios/kernel/branches/net/network/tcp_subr.inc
hidnplayr 151ae82c14 Port numbers for TCP and UDP must be given in Big endian order now. 
git-svn-id: svn://kolibrios.org@2995 a494cfbc-eb01-0410-851d-a64ba20cac60
2012-11-01 12:33:15 +00:00

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; 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 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
align 4
iglobal
TCP_backoff db 0,1,2,3,4,5,6,6,6,6,6,6,6
endg
macro TCP_checksum IP1, IP2 {
;-------------
; Pseudoheader
; protocol type
mov edx, IP_PROTO_TCP
; source address
add dl, byte [IP1+1]
adc dh, byte [IP1+0]
adc dl, byte [IP1+3]
adc dh, byte [IP1+2]
; destination address
adc dl, byte [IP2+1]
adc dh, byte [IP2+0]
adc dl, byte [IP2+3]
adc dh, byte [IP2+2]
; size
adc dl, cl
adc dh, ch
adc edx, 0
;---------------------
; Real header and data
push esi
call checksum_1
call checksum_2
pop esi
} ; returns in dx only
macro TCP_sendseqinit ptr {
push edi ;;;; i dont like this static use of edi
mov edi, [ptr + TCP_SOCKET.ISS]
mov [ptr + TCP_SOCKET.SND_UP], edi
mov [ptr + TCP_SOCKET.SND_MAX], edi
mov [ptr + TCP_SOCKET.SND_NXT], edi
mov [ptr + TCP_SOCKET.SND_UNA], edi
pop edi
}
macro TCP_rcvseqinit ptr {
push edi
mov edi, [ptr + TCP_SOCKET.IRS]
inc edi
mov [ptr + TCP_SOCKET.RCV_NXT], edi
mov [ptr + TCP_SOCKET.RCV_ADV], edi
pop edi
}
macro TCP_init_socket socket {
mov [socket + TCP_SOCKET.t_maxseg], TCP_mss_default
mov [socket + TCP_SOCKET.t_flags], TF_REQ_SCALE or TF_REQ_TSTMP
mov [socket + TCP_SOCKET.t_srtt], TCP_time_srtt_default
mov [socket + TCP_SOCKET.t_rttvar], TCP_time_rtt_default * 4
mov [socket + TCP_SOCKET.t_rttmin], TCP_time_re_min
;;; TODO: TCP_time_rangeset
mov [socket + TCP_SOCKET.SND_CWND], TCP_max_win shl TCP_max_winshift
mov [socket + TCP_SOCKET.SND_SSTHRESH], TCP_max_win shl TCP_max_winshift
}
;---------------------------
;
; TCP_pull_out_of_band
;
; IN: eax =
; ebx = socket ptr
; edx = tcp packet ptr
;
; OUT: /
;
;---------------------------
align 4
TCP_pull_out_of_band:
DEBUGF 1,"TCP_pull_out_of_band\n"
;;;; 1282-1305
ret
;-------------------------
;
; TCP_drop
;
; IN: eax = socket ptr
; ebx = error number
;
; OUT: eax = socket ptr
;
;-------------------------
align 4
TCP_drop:
DEBUGF 1,"TCP_drop: %x\n", eax
cmp [eax + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED
jb .no_syn_received
mov [eax + TCP_SOCKET.t_state], TCPS_CLOSED
call TCP_output
;;; TODO: update stats
jmp TCP_close
.no_syn_received:
;;; TODO: update stats
;;; TODO: check if error code is "Connection timed out' and handle accordingly
mov [eax + SOCKET.errorcode], ebx
;-------------------------
;
; TCP_close
;
; IN: eax = socket ptr
; OUT: eax = socket ptr
;
;-------------------------
align 4
TCP_close:
DEBUGF 1,"TCP_close: %x\n", eax
;;; TODO: update RTT and mean deviation
;;; TODO: update slow start threshold
call SOCKET_is_disconnected
ret
;-------------------------
;
; TCP_disconnect
;
; IN: eax = socket ptr
; OUT: eax = socket ptr
;
;-------------------------
align 4
TCP_disconnect:
DEBUGF 1,"TCP_disconnect: %x\n", eax
cmp [eax + TCP_SOCKET.t_state], TCPS_ESTABLISHED
jb TCP_close
; TODO: implement LINGER ?
call SOCKET_is_disconnecting
call TCP_usrclosed
call TCP_output
ret
;-------------------------
;
; TCP_usrclose
;
; IN: eax = socket ptr
;
;-------------------------
align 4
TCP_usrclosed:
DEBUGF 1,"TCP_usrclosed: %x\n", eax
push ebx
mov ebx, [eax + TCP_SOCKET.t_state]
mov ebx, dword [.switch + ebx*4]
jmp ebx
.switch:
dd .close ; TCPS_CLOSED
dd .close ; TCPS_LISTEN
dd .close ; TCPS_SYN_SENT
dd .wait1 ; TCPS_SYN_RECEIVED
dd .wait1 ; TCPS_ESTABLISHED
dd .last_ack ; TCPS_CLOSE_WAIT
dd .ret ; TCPS_FIN_WAIT_1
dd .ret ; TCPS_CLOSING
dd .ret ; TCPS_LAST_ACK
dd .disc ; TCPS_FIN_WAIT_2
dd .disc ; TCPS_TIMED_WAIT
.close:
pop ebx
mov [eax + TCP_SOCKET.t_state], TCPS_CLOSED
call TCP_close
ret
.wait1:
pop ebx
mov [eax + TCP_SOCKET.t_state], TCPS_FIN_WAIT_1
ret
.last_ack:
pop ebx
mov [eax + TCP_SOCKET.t_state], TCPS_LAST_ACK
ret
.disc:
call SOCKET_is_disconnected
.ret:
pop ebx
ret
;-------------------------
;
; TCP_outflags
;
; IN: eax = socket ptr
;
; OUT: edx = flags
;
;-------------------------
align 4
TCP_outflags:
mov edx, [eax + TCP_SOCKET.t_state]
movzx edx, byte [edx + .flaglist]
DEBUGF 1,"TCP_outflags: socket=%x flags=%x\n", eax, dl
ret
.flaglist:
db TH_RST + TH_ACK ; TCPS_CLOSED
db 0 ; TCPS_LISTEN
db TH_SYN ; TCPS_SYN_SENT
db TH_SYN + TH_ACK ; TCPS_SYN_RECEIVED
db TH_ACK ; TCPS_ESTABLISHED
db TH_ACK ; TCPS_CLOSE_WAIT
db TH_FIN + TH_ACK ; TCPS_FIN_WAIT_1
db TH_FIN + TH_ACK ; TCPS_CLOSING
db TH_FIN + TH_ACK ; TCPS_LAST_ACK
db TH_ACK ; TCPS_FIN_WAIT_2
db TH_ACK ; TCPS_TIMED_WAIT
;---------------------------------------
;
; The fast way to send an ACK/RST/keepalive segment
;
; TCP_respond_socket:
;
; IN: ebx = socket ptr
; cl = flags
;
;--------------------------------------
align 4
TCP_respond_socket:
DEBUGF 1,"TCP_respond_socket: socket=%x flags=%x\n", ebx, cl
;---------------------
; Create the IP packet
push cx ebx
mov eax, [ebx + IP_SOCKET.RemoteIP]
mov edx, [ebx + IP_SOCKET.LocalIP]
mov ecx, sizeof.TCP_header
mov di, IP_PROTO_TCP shl 8 + 128
call IPv4_output
test edi, edi
jz .error
pop esi cx
push edx eax
;-----------------------------------------------
; Fill in the TCP header by using the socket ptr
mov ax, [esi + TCP_SOCKET.LocalPort]
stosw
mov ax, [esi + TCP_SOCKET.RemotePort]
stosw
mov eax, [esi + TCP_SOCKET.SND_NXT]
bswap eax
stosd
mov eax, [esi + TCP_SOCKET.RCV_NXT]
bswap eax
stosd
mov al, 0x50 ; Dataoffset: 20 bytes (TCP_header.DataOffset)
stosb
mov al, cl
stosb
; mov ax, [esi + TCP_SOCKET.RCV_WND]
; rol ax, 8
mov ax, 0x00a0 ;;;;;;; FIXME
stosw ; window
xor eax, eax
stosd ; checksum + urgentpointer
;---------------------
; Fill in the checksum
.checksum:
sub edi, sizeof.TCP_header
mov ecx, sizeof.TCP_header
xchg esi, edi
TCP_checksum (edi + IP_SOCKET.LocalIP), (edi + IP_SOCKET.RemoteIP)
mov [esi+TCP_header.Checksum], dx
;--------------------
; And send the segment
call [ebx + NET_DEVICE.transmit]
ret
.error:
DEBUGF 1,"TCP_respond_socket: failed\n"
add esp, 2 + 4
ret
;-------------------------
; TCP_respond.segment:
;
; IN: edx = segment ptr (a previously received segment)
; edi = ptr to dest and src IPv4 addresses
; cl = flags
align 4
TCP_respond_segment:
DEBUGF 1,"TCP_respond_segment: frame=%x flags=%c\n", edx, cl
;---------------------
; Create the IP packet
push cx edx
mov ebx, [edi + 4]
mov eax, [edi]
mov ecx, sizeof.TCP_header
mov di , IP_PROTO_TCP shl 8 + 128
call IPv4_output
jz .error
pop esi cx
push edx eax
;---------------------------------------------------
; Fill in the TCP header by using a received segment
mov ax, [esi + TCP_header.DestinationPort]
stosw
mov ax, [esi + TCP_header.SourcePort]
stosw
mov eax, [esi + TCP_header.AckNumber]
bswap eax
stosd
xor eax, eax
stosd
mov al, 0x50 ; Dataoffset: 20 bytes (sizeof.TCP_header)
stosb
mov al, cl
stosb
mov ax, 1280
rol ax, 8
stosw ; window
xor eax, eax
stosd ; checksum + urgentpointer
;---------------------
; Fill in the checksum
.checksum:
lea esi, [edi - sizeof.TCP_header]
mov ecx, sizeof.TCP_header
TCP_checksum (esi - sizeof.IPv4_header + IPv4_header.DestinationAddress),\ ; FIXME
(esi - sizeof.IPv4_header + IPv4_header.SourceAddress)
mov [esi+TCP_header.Checksum], dx
;--------------------
; And send the segment
call [ebx + NET_DEVICE.transmit]
ret
.error:
DEBUGF 1,"TCP_respond_segment: failed\n"
add esp, 2+4
ret
macro TCPT_RANGESET timer, value, min, max {
local .min
local .max
local .done
cmp value, min
jb .min
cmp value, max
ja .max
mov timer, value
jmp .done
.min:
mov timer, value
jmp .done
.max:
mov timer, value
jmp .done
.done:
}
align 4
TCP_set_persist:
; First, check if retransmit timer is not set, retransmit and persist are mutually exclusive
cmp [eax + TCP_SOCKET.timer_retransmission], 0
jg @f
; calculate RTO
push ebx
mov ebx, [eax + TCP_SOCKET.t_srtt]
shr ebx, 2
add ebx, [eax + TCP_SOCKET.t_rttvar]
shr ebx, 1
mov cl, [eax + TCP_SOCKET.t_rxtshift]
shl ebx, cl
; Start/restart persistance timer.
TCPT_RANGESET [eax + TCP_SOCKET.timer_persist], ebx, TCP_time_pers_min, TCP_time_pers_max
pop ebx
cmp [eax + TCP_SOCKET.t_rxtshift], TCP_max_rxtshift
jae @f
inc [eax + TCP_SOCKET.t_rxtshift]
@@:
ret
; eax = rtt
; ebx = socket ptr
align 4
TCP_xmit_timer:
DEBUGF 1,"TCP_xmit_timer: socket=%x rtt=%d0ms\n", ebx, eax
;TODO: update stats
cmp [ebx + TCP_SOCKET.t_rtt], 0
je .no_rtt_yet
; srtt is stored as a fixed point with 3 bits after the binary point.
; The following magic is equivalent of the smoothing algorithm in rfc793 with an alpha of .875
; (srtt = rtt/8 + srtt*7/8 in fixed point)
; Adjust rtt to origin 0.
push ecx
mov ecx, [ebx + TCP_SOCKET.t_srtt]
shr ecx, TCP_RTT_SHIFT
sub eax, ecx
dec eax
pop ecx
add [ebx + TCP_SOCKET.t_srtt], eax
ja @f
mov [ebx + TCP_SOCKET.t_srtt], 1
@@:
; We accumulate a smoothed rtt variance (actually, a smoothed mean difference),
; then set the retransmit timer to smoothed rtt + 4 times the smoothed variance.
; rttvar is stored as fixed point with 2 bits after the binary point.
; The following is equivalent to rfc793 smoothing with an alpha of .75
; (rttvar = rttvar*3/4 + delta/4) (delta = eax)
; get abs(eax)
push edx
cdq
xor eax, edx
sub eax, edx
mov edx, [ebx + TCP_SOCKET.t_rttvar]
shr edx, TCP_RTTVAR_SHIFT
sub eax, edx
pop edx
add [ebx + TCP_SOCKET.t_rttvar], eax
ja @f
mov [ebx + TCP_SOCKET.t_rttvar], 1
@@:
ret
.no_rtt_yet:
push ecx
mov ecx, eax
shl ecx, TCP_RTT_SHIFT
mov [ebx + TCP_SOCKET.t_srtt], ecx
shl eax, TCP_RTTVAR_SHIFT - 1
mov [ebx + TCP_SOCKET.t_rttvar], eax
pop ecx
ret
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