forked from KolibriOS/kolibrios
547 lines
12 KiB
PHP
547 lines
12 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; Part of the TCP/IP network stack for KolibriOS ;;
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;; ;;
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;; Written by hidnplayr@kolibrios.org ;;
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;; ;;
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;; Based on the code of 4.4BSD ;;
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;; ;;
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;; GNU GENERAL PUBLIC LICENSE ;;
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;; Version 2, June 1991 ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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align 4
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iglobal
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TCP_backoff db 0,1,2,3,4,5,6,6,6,6,6,6,6
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endg
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macro TCP_checksum IP1, IP2 {
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;-------------
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; Pseudoheader
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; protocol type
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mov edx, IP_PROTO_TCP
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; source address
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add dl, byte [IP1+1]
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adc dh, byte [IP1+0]
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adc dl, byte [IP1+3]
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adc dh, byte [IP1+2]
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; destination address
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adc dl, byte [IP2+1]
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adc dh, byte [IP2+0]
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adc dl, byte [IP2+3]
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adc dh, byte [IP2+2]
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; size
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adc dl, cl
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adc dh, ch
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adc edx, 0
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;---------------------
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; Real header and data
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push esi
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call checksum_1
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call checksum_2
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pop esi
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} ; returns in dx only
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macro TCP_sendseqinit ptr {
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push edi ;;;; i dont like this static use of edi
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mov edi, [ptr + TCP_SOCKET.ISS]
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mov [ptr + TCP_SOCKET.SND_UP], edi
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mov [ptr + TCP_SOCKET.SND_MAX], edi
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mov [ptr + TCP_SOCKET.SND_NXT], edi
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mov [ptr + TCP_SOCKET.SND_UNA], edi
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pop edi
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}
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macro TCP_rcvseqinit ptr {
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push edi
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mov edi, [ptr + TCP_SOCKET.IRS]
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inc edi
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mov [ptr + TCP_SOCKET.RCV_NXT], edi
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mov [ptr + TCP_SOCKET.RCV_ADV], edi
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pop edi
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}
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macro TCP_init_socket socket {
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mov [socket + TCP_SOCKET.t_maxseg], TCP_mss_default
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mov [socket + TCP_SOCKET.t_flags], TF_REQ_SCALE or TF_REQ_TSTMP
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mov [socket + TCP_SOCKET.t_srtt], TCP_time_srtt_default
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mov [socket + TCP_SOCKET.t_rttvar], TCP_time_rtt_default * 4
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mov [socket + TCP_SOCKET.t_rttmin], TCP_time_re_min
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;;; TODO: TCP_time_rangeset
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mov [socket + TCP_SOCKET.SND_CWND], TCP_max_win shl TCP_max_winshift
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mov [socket + TCP_SOCKET.SND_SSTHRESH], TCP_max_win shl TCP_max_winshift
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}
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;---------------------------
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;
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; TCP_pull_out_of_band
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;
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; IN: eax =
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; ebx = socket ptr
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; edx = tcp packet ptr
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;
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; OUT: /
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;
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;---------------------------
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align 4
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TCP_pull_out_of_band:
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DEBUGF 1,"TCP_pull_out_of_band\n"
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;;;; 1282-1305
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ret
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;-------------------------
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;
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; TCP_drop
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;
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; IN: eax = socket ptr
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; ebx = error number
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;
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; OUT: eax = socket ptr
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;
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;-------------------------
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align 4
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TCP_drop:
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DEBUGF 1,"TCP_drop: %x\n", eax
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cmp [eax + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED
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jb .no_syn_received
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mov [eax + TCP_SOCKET.t_state], TCPS_CLOSED
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call TCP_output
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;;; TODO: update stats
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jmp TCP_close
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.no_syn_received:
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;;; TODO: update stats
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;;; TODO: check if error code is "Connection timed out' and handle accordingly
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mov [eax + SOCKET.errorcode], ebx
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;-------------------------
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;
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; TCP_close
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;
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; IN: eax = socket ptr
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; OUT: eax = socket ptr
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;
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;-------------------------
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align 4
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TCP_close:
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DEBUGF 1,"TCP_close: %x\n", eax
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;;; TODO: update RTT and mean deviation
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;;; TODO: update slow start threshold
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call SOCKET_is_disconnected
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call SOCKET_free
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ret
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;-------------------------
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;
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; TCP_outflags
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;
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; IN: eax = socket ptr
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;
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; OUT: edx = flags
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;
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;-------------------------
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align 4
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TCP_outflags:
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mov edx, [eax + TCP_SOCKET.t_state]
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movzx edx, byte [edx + .flaglist]
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DEBUGF 1,"TCP_outflags: socket=%x flags=%x\n", eax, dl
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ret
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.flaglist:
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db TH_RST + TH_ACK ; TCPS_CLOSED
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db 0 ; TCPS_LISTEN
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db TH_SYN ; TCPS_SYN_SENT
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db TH_SYN + TH_ACK ; TCPS_SYN_RECEIVED
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db TH_ACK ; TCPS_ESTABLISHED
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db TH_ACK ; TCPS_CLOSE_WAIT
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db TH_FIN + TH_ACK ; TCPS_FIN_WAIT_1
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db TH_FIN + TH_ACK ; TCPS_CLOSING
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db TH_FIN + TH_ACK ; TCPS_LAST_ACK
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db TH_ACK ; TCPS_FIN_WAIT_2
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db TH_ACK ; TCPS_TIMED_WAIT
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;---------------------------------------
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;
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; The fast way to send an ACK/RST/keepalive segment
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;
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; TCP_respond
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;
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; IN: ebx = socket ptr
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; cl = flags
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;
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;--------------------------------------
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align 4
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TCP_respond:
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DEBUGF 1,"TCP_respond_socket: socket=%x flags=%x\n", ebx, cl
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;---------------------
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; Create the IP packet
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push cx ebx
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mov eax, [ebx + IP_SOCKET.RemoteIP]
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mov edx, [ebx + IP_SOCKET.LocalIP]
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mov ecx, sizeof.TCP_header
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mov di, IP_PROTO_TCP shl 8 + 128
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call IPv4_output
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test edi, edi
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jz .error
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pop esi cx
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push edx eax
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;-----------------------------------------------
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; Fill in the TCP header by using the socket ptr
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mov ax, [esi + TCP_SOCKET.LocalPort]
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stosw
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mov ax, [esi + TCP_SOCKET.RemotePort]
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stosw
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mov eax, [esi + TCP_SOCKET.SND_NXT]
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bswap eax
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stosd
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mov eax, [esi + TCP_SOCKET.RCV_NXT]
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bswap eax
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stosd
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mov al, 0x50 ; Dataoffset: 20 bytes (TCP_header.DataOffset)
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stosb
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mov al, cl
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stosb
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; mov ax, [esi + TCP_SOCKET.RCV_WND]
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; rol ax, 8
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mov ax, 0x00a0 ;;;;;;; FIXME
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stosw ; window
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xor eax, eax
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stosd ; checksum + urgentpointer
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;---------------------
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; Fill in the checksum
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.checksum:
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sub edi, sizeof.TCP_header
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mov ecx, sizeof.TCP_header
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xchg esi, edi
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TCP_checksum (edi + IP_SOCKET.LocalIP), (edi + IP_SOCKET.RemoteIP)
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mov [esi+TCP_header.Checksum], dx
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;--------------------
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; And send the segment
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call [ebx + NET_DEVICE.transmit]
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ret
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.error:
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DEBUGF 1,"TCP_respond_socket: failed\n"
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add esp, 2 + 4
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ret
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;-------------------------
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; TCP_respond_segment:
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;
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; IN: edx = segment ptr (a previously received segment)
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; edi = ptr to dest and src IPv4 addresses
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; cl = flags
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align 4
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TCP_respond_segment:
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DEBUGF 1,"TCP_respond_segment: frame=%x flags=%x\n", edx, cl
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;---------------------
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; Create the IP packet
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push cx edx
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mov ebx, [edi + 4]
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mov eax, [edi]
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mov ecx, sizeof.TCP_header
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mov di, IP_PROTO_TCP shl 8 + 128
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call IPv4_output
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jz .error
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pop esi cx
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push edx eax
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;---------------------------------------------------
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; Fill in the TCP header by using a received segment
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mov ax, [esi + TCP_header.DestinationPort]
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stosw
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mov ax, [esi + TCP_header.SourcePort]
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stosw
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mov eax, [esi + TCP_header.AckNumber]
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bswap eax
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stosd
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xor eax, eax
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stosd
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mov al, 0x50 ; Dataoffset: 20 bytes (sizeof.TCP_header/4 shl 4)
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stosb
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mov al, cl
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stosb
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mov ax, 1280
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rol ax, 8
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stosw ; window
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xor eax, eax
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stosd ; checksum + urgentpointer
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;---------------------
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; Fill in the checksum
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lea esi, [edi - sizeof.TCP_header]
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mov ecx, sizeof.TCP_header
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TCP_checksum (esi - sizeof.IPv4_header + IPv4_header.DestinationAddress),\ ; FIXME
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(esi - sizeof.IPv4_header + IPv4_header.SourceAddress)
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mov [esi + TCP_header.Checksum], dx
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;--------------------
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; And send the segment
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call [ebx + NET_DEVICE.transmit]
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ret
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.error:
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DEBUGF 1,"TCP_respond_segment: failed\n"
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add esp, 2+4
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ret
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macro TCPT_RANGESET timer, value, min, max {
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local .min
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local .max
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local .done
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cmp value, min
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jb .min
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cmp value, max
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ja .max
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mov timer, value
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jmp .done
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.min:
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mov timer, value
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jmp .done
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.max:
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mov timer, value
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jmp .done
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.done:
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}
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align 4
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TCP_set_persist:
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DEBUGF 1,"TCP_set_persist\n"
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; First, check if retransmit timer is not set, retransmit and persist are mutually exclusive
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cmp [eax + TCP_SOCKET.timer_retransmission], 0
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ja @f
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; calculate RTO
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push ebx
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mov ebx, [eax + TCP_SOCKET.t_srtt]
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shr ebx, 2
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add ebx, [eax + TCP_SOCKET.t_rttvar]
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shr ebx, 1
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mov cl, [eax + TCP_SOCKET.t_rxtshift]
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shl ebx, cl
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; Start/restart persistance timer.
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TCPT_RANGESET [eax + TCP_SOCKET.timer_persist], ebx, TCP_time_pers_min, TCP_time_pers_max
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pop ebx
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cmp [eax + TCP_SOCKET.t_rxtshift], TCP_max_rxtshift
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jae @f
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inc [eax + TCP_SOCKET.t_rxtshift]
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@@:
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ret
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; eax = rtt
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; ebx = socket ptr
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align 4
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TCP_xmit_timer:
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DEBUGF 1,"TCP_xmit_timer: socket=%x rtt=%d0ms\n", ebx, eax
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;TODO: update stats
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cmp [ebx + TCP_SOCKET.t_rtt], 0
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je .no_rtt_yet
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; srtt is stored as a fixed point with 3 bits after the binary point.
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; The following magic is equivalent of the smoothing algorithm in rfc793 with an alpha of .875
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; (srtt = rtt/8 + srtt*7/8 in fixed point)
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; Adjust rtt to origin 0.
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push ecx
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mov ecx, [ebx + TCP_SOCKET.t_srtt]
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shr ecx, TCP_RTT_SHIFT
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sub eax, ecx
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dec eax
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pop ecx
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add [ebx + TCP_SOCKET.t_srtt], eax
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ja @f
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mov [ebx + TCP_SOCKET.t_srtt], 1
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@@:
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; We accumulate a smoothed rtt variance (actually, a smoothed mean difference),
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; then set the retransmit timer to smoothed rtt + 4 times the smoothed variance.
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; rttvar is stored as fixed point with 2 bits after the binary point.
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; The following is equivalent to rfc793 smoothing with an alpha of .75
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; (rttvar = rttvar*3/4 + delta/4) (delta = eax)
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; get abs(eax)
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push edx
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cdq
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xor eax, edx
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sub eax, edx
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mov edx, [ebx + TCP_SOCKET.t_rttvar]
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shr edx, TCP_RTTVAR_SHIFT
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sub eax, edx
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pop edx
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add [ebx + TCP_SOCKET.t_rttvar], eax
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ja @f
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mov [ebx + TCP_SOCKET.t_rttvar], 1
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@@:
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ret
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.no_rtt_yet:
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push ecx
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mov ecx, eax
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shl ecx, TCP_RTT_SHIFT
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mov [ebx + TCP_SOCKET.t_srtt], ecx
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shl eax, TCP_RTTVAR_SHIFT - 1
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mov [ebx + TCP_SOCKET.t_rttvar], eax
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pop ecx
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ret
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; eax = max segment size
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; ebx = socket ptr
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align 4
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TCP_mss:
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cmp eax, 1420 ; FIXME
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jbe @f
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mov eax, 1420
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@@:
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mov [ebx + TCP_SOCKET.t_maxseg], eax
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ret
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; ebx = socket ptr
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; edx = segment ptr
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align 4
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TCP_reassemble:
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ret
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