298 lines
12 KiB
PHP
298 lines
12 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2015. 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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; Socket states
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TCPS_CLOSED = 0
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TCPS_LISTEN = 1
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TCPS_SYN_SENT = 2
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TCPS_SYN_RECEIVED = 3
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TCPS_ESTABLISHED = 4
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TCPS_CLOSE_WAIT = 5
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TCPS_FIN_WAIT_1 = 6
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TCPS_CLOSING = 7
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TCPS_LAST_ACK = 8
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TCPS_FIN_WAIT_2 = 9
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TCPS_TIMED_WAIT = 10
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; Socket Flags
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TF_ACKNOW = 1 shl 0 ; ack peer immediately
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TF_DELACK = 1 shl 1 ; ack, but try to delay it
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TF_NODELAY = 1 shl 2 ; don't delay packets to coalesce
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TF_NOOPT = 1 shl 3 ; don't use tcp options
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TF_SENTFIN = 1 shl 4 ; have sent FIN
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TF_REQ_SCALE = 1 shl 5 ; have/will request window scaling
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TF_RCVD_SCALE = 1 shl 6 ; other side has requested scaling
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TF_REQ_TSTMP = 1 shl 7 ; have/will request timestamps
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TF_RCVD_TSTMP = 1 shl 8 ; a timestamp was received in SYN
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TF_SACK_PERMIT = 1 shl 9 ; other side said I could SACK
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; Segment flags
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TH_FIN = 1 shl 0
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TH_SYN = 1 shl 1
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TH_RST = 1 shl 2
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TH_PUSH = 1 shl 3
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TH_ACK = 1 shl 4
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TH_URG = 1 shl 5
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; Segment header options
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TCP_OPT_EOL = 0 ; End of option list.
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TCP_OPT_NOP = 1 ; No-Operation.
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TCP_OPT_MAXSEG = 2 ; Maximum Segment Size.
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TCP_OPT_WINDOW = 3 ; window scale
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TCP_OPT_SACK_PERMIT = 4 ; Selective Acknowledgement
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TCP_OPT_SACK = 5
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TCP_OPT_TIMESTAMP = 8
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; Fundamental timer values
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TCP_time_MSL = 47 ; max segment lifetime (30s)
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TCP_time_re_min = 2 ; min retransmission (1,28s)
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TCP_time_re_max = 100 ; max retransmission (64s)
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TCP_time_pers_min = 8 ; min persist (5,12s)
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TCP_time_pers_max = 94 ; max persist (60,16s)
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TCP_time_keep_init = 118 ; connection establishment (75,52s)
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TCP_time_keep_idle = 4608 ; idle time before 1st probe (2h)
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TCP_time_keep_interval = 118 ; between probes when no response (75,52s)
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TCP_time_rtt_default = 5 ; default Round Trip Time (3,2s)
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TCP_time_srtt_default = 0 ;
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TCP_time_max_idle = 8*TCP_time_keep_interval ; FIXME
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TCP_time_connect = 300 ; in 1/100s (default=3s)
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; timer constants
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TCP_max_rxtshift = 12 ; max retransmissions waiting for ACK
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TCP_max_keepcnt = 8 ; max keepalive probes
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;
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TCP_max_winshift = 14
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TCP_max_win = 65535
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TCP_re_xmit_thresh = 3
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TCP_mss_default = 1480 ; default max segment size
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; smoothed round trip time and estimated variance are stored as fixed point numbers,
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; shifted by the value below.
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; With these scales, srtt has 3 bits to the right of the binary point, and thus an "alpha"
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; of .875. rttvar has 2 bits to the right and thus "alpha" of 0.75
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TCP_RTT_SHIFT = 3
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TCP_RTTVAR_SHIFT = 2
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; bits used by tcp_input and tcp_output
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TCP_BIT_NEEDOUTPUT = 1 shl 0
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TCP_BIT_TIMESTAMP = 1 shl 1
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TCP_BIT_DROPSOCKET = 1 shl 2
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TCP_BIT_FIN_IS_ACKED = 1 shl 3
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TCP_BIT_SENDALOT = 1 shl 0
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TCP_PAWS_IDLE = 24*24*60*60*100 ; 24 days, in 1/100 seconds
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TCP_QUEUE_SIZE = 50
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struct TCP_header
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SourcePort dw ?
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DestinationPort dw ?
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SequenceNumber dd ?
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AckNumber dd ?
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DataOffset db ? ; DataOffset[0-3 bits] and Reserved[4-7]
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Flags db ? ; Reserved[0-1 bits]|URG|ACK|PSH|RST|SYN|FIN
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Window dw ?
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Checksum dw ?
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UrgentPointer dw ?
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ends
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struct TCP_queue_entry
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ip_ptr dd ?
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segment_ptr dd ?
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segment_size dd ?
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device_ptr dd ?
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timestamp dd ?
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buffer_ptr dd ?
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ends
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uglobal
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align 4
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TCP_segments_tx rd NET_DEVICES_MAX
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TCP_segments_rx rd NET_DEVICES_MAX
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TCP_segments_missed rd NET_DEVICES_MAX
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TCP_segments_dumped rd NET_DEVICES_MAX
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; TCP_bytes_rx rq NET_DEVICES_MAX
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; TCP_bytes_tx rq NET_DEVICES_MAX
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TCP_sequence_num dd ?
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TCP_queue rd (TCP_QUEUE_SIZE*sizeof.TCP_queue_entry + sizeof.queue)/4
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TCP_input_event dd ?
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TCP_timer1_event dd ?
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endg
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uglobal
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align 4
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TCPS_accepts dd ? ; #SYNs received in LISTEN state
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TCPS_closed dd ? ; #connections closed (includes drops)
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TCPS_connattempt dd ? ; #connections initiated (calls to connect)
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TCPS_conndrops dd ? ; #embryonic connections dropped (before SYN received)
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TCPS_connects dd ? ; #connections established actively or passively
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TCPS_delack dd ? ; #delayed ACKs sent
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TCPS_drops dd ? ; #connections dropped (after SYN received)
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TCPS_keepdrops dd ? ; #connections dropped in keepalive (established or awaiting SYN)
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TCPS_keepprobe dd ? ; #keepalive probes sent
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TCPS_keeptimeo dd ? ; #times keepalive timer or connections-establishment timer expire
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TCPS_pawsdrop dd ? ; #segments dropped due to PAWS
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TCPS_pcbcachemiss dd ? ; #times PCB cache comparison fails
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TCPS_persisttimeo dd ? ; #times persist timer expires
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TCPS_predack dd ? ; #times header prediction correct for ACKs
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TCPS_preddat dd ? ; #times header prediction correct for data packets
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TCPS_rcvackbyte dd ? ; #bytes ACKed by received ACKs
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TCPS_rcvackpack dd ? ; #received ACK packets
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TCPS_rcvacktoomuch dd ? ; #received ACKs for unsent data
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TCPS_rcvafterclose dd ? ; #packets received after connection closed
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TCPS_rcvbadoff dd ? ; #packets received with invalid header length
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TCPS_rcvbadsum dd ? ; #packets received with checksum errors
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TCPS_rcvbyte dd ? ; #bytes received in sequence
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TCPS_rcvbyteafterwin dd ? ; #bytes received beyond advertised window
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TCPS_rcvdupack dd ? ; #duplicate ACKs received
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TCPS_rcvdupbyte dd ? ; #bytes receivedin completely duplicate packets
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TCPS_rcvduppack dd ? ; #packets received with completely duplicate bytes
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TCPS_rcvoobyte dd ? ; #out-of-order bytes received
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TCPS_rcvoopack dd ? ; #out-of-order packets received
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TCPS_rcvpack dd ? ; #packets received in sequence
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TCPS_rcvpackafterwin dd ? ; #packets with some data beyond advertised window
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TCPS_rcvpartdupbyte dd ? ; #duplicate bytes in part-duplicate packets
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TCPS_rcvpartduppack dd ? ; #packets with some duplicate data
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TCPS_rcvshort dd ? ; #packets received too short
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TCPS_rcvtotal dd ? ; #total packets received
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TCPS_rcvwinprobe dd ? ; #window probe packets received
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TCPS_rcvwinupd dd ? ; #received window update packets
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TCPS_rexmttimeo dd ? ; #retransmission timeouts
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TCPS_rttupdated dd ? ; #times RTT estimators updated
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TCPS_segstimed dd ? ; #segments for which TCP tried to measure RTT
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TCPS_sndacks dd ? ; #ACK-only packets sent (data length = 0)
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TCPS_sndbyte dd ? ; #data bytes sent
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TCPS_sndctrl dd ? ; #control (SYN, FIN, RST) packets sent (data length = 0)
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TCPS_sndpack dd ? ; #data packets sent (data length > 0)
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TCPS_sndprobe dd ? ; #window probes sent (1 byte of data forced by persist timer)
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TCPS_sndrexmitbyte dd ? ; #data bytes retransmitted
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TCPS_sndrexmitpack dd ? ; #data packets retransmitted
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TCPS_sndtotal dd ? ; total #packets sent
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TCPS_sndurg dd ? ; #packets sent with URG-only (data length=0)
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TCPS_sndwinup dd ? ; #window update-only packets sent (data length=0)
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TCPS_timeoutdrop dd ? ; #connections dropped in retransmission timeout
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endg
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;-----------------------------------------------------------------;
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; ;
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; TCP_init: Resets all TCP variables. ;
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; ;
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;-----------------------------------------------------------------;
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macro tcp_init {
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xor eax, eax
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mov edi, TCP_segments_tx
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mov ecx, (6*NET_DEVICES_MAX)
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rep stosd
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pseudo_random eax
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mov [TCP_sequence_num], eax
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init_queue TCP_queue
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movi ebx, 1
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mov ecx, tcp_process_input
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call new_sys_threads
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test eax, eax
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jns @f
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DEBUGF DEBUG_NETWORK_ERROR,'K : cannot create kernel thread for TCP input, error %d\n', eax
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@@:
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movi ebx, 1
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mov ecx, tcp_timer_640ms
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call new_sys_threads
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test eax, eax
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jns @f
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DEBUGF DEBUG_NETWORK_ERROR,'K : cannot create kernel thread for TCP timer, error %d\n', eax
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@@:
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}
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include 'tcp_timer.inc'
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include 'tcp_subr.inc'
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include 'tcp_usreq.inc'
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include 'tcp_input.inc'
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include 'tcp_output.inc'
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;------------------------------------------------------------------;
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; ;
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; tcp_api: Part of system function 76 ;
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; ;
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; IN: bl = subfunction number ;
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; bh = device number ;
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; ecx, edx, .. depends on subfunction ;
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; ;
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; OUT: depends on subfunction ;
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; ;
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;------------------------------------------------------------------;
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align 4
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tcp_api:
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movzx eax, bh
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shl eax, 2
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test bl, bl
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jz .packets_tx ; 0
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dec bl
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jz .packets_rx ; 1
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dec bl
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jz .packets_missed ; 2
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dec bl
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jz .packets_dumped ; 3
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dec bl
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jz .packets_queued ; 4
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.error:
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mov eax, -1
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ret
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.packets_tx:
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mov eax, [TCP_segments_tx + eax]
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ret
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.packets_rx:
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mov eax, [TCP_segments_rx + eax]
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ret
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.packets_missed:
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mov eax, [TCP_segments_missed + eax]
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ret
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.packets_dumped:
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mov eax, [TCP_segments_dumped + eax]
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ret
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.packets_queued:
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mov eax, [TCP_queue + queue.size]
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ret
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