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

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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 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
; 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 ?
buffer_size 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