WebSVN – Kolibri OS – Blame – /kernel/trunk/network/tcp.inc

Rev	Author	Line No.	Line
3545	hidnplayr	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		2	;; ;;
5363	yogev_ezra	3	;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;;
3545	hidnplayr	4	;; Distributed under terms of the GNU General Public License ;;
		5	;; ;;
		6	;; Part of the TCP/IP network stack for KolibriOS ;;
		7	;; ;;
		8	;; Written by hidnplayr@kolibrios.org ;;
		9	;; ;;
		10	;; Based on the code of 4.4BSD ;;
		11	;; ;;
		12	;; GNU GENERAL PUBLIC LICENSE ;;
		13	;; Version 2, June 1991 ;;
		14	;; ;;
		15	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		16
4850	mario79	17	$Revision: 5363 $
3545	hidnplayr	18
		19	; Socket states
		20	TCPS_CLOSED = 0
		21	TCPS_LISTEN = 1
		22	TCPS_SYN_SENT = 2
		23	TCPS_SYN_RECEIVED = 3
		24	TCPS_ESTABLISHED = 4
		25	TCPS_CLOSE_WAIT = 5
		26	TCPS_FIN_WAIT_1 = 6
		27	TCPS_CLOSING = 7
		28	TCPS_LAST_ACK = 8
		29	TCPS_FIN_WAIT_2 = 9
		30	TCPS_TIMED_WAIT = 10
		31
		32	; Socket Flags
		33	TF_ACKNOW = 1 shl 0 ; ack peer immediately
		34	TF_DELACK = 1 shl 1 ; ack, but try to delay it
		35	TF_NODELAY = 1 shl 2 ; don't delay packets to coalesce
		36	TF_NOOPT = 1 shl 3 ; don't use tcp options
		37	TF_SENTFIN = 1 shl 4 ; have sent FIN
		38	TF_REQ_SCALE = 1 shl 5 ; have/will request window scaling
		39	TF_RCVD_SCALE = 1 shl 6 ; other side has requested scaling
		40	TF_REQ_TSTMP = 1 shl 7 ; have/will request timestamps
		41	TF_RCVD_TSTMP = 1 shl 8 ; a timestamp was received in SYN
		42	TF_SACK_PERMIT = 1 shl 9 ; other side said I could SACK
		43
		44	; Segment flags
		45	TH_FIN = 1 shl 0
		46	TH_SYN = 1 shl 1
		47	TH_RST = 1 shl 2
		48	TH_PUSH = 1 shl 3
		49	TH_ACK = 1 shl 4
		50	TH_URG = 1 shl 5
		51
		52	; Segment header options
		53	TCP_OPT_EOL = 0 ; End of option list.
		54	TCP_OPT_NOP = 1 ; No-Operation.
		55	TCP_OPT_MAXSEG = 2 ; Maximum Segment Size.
		56	TCP_OPT_WINDOW = 3 ; window scale
		57	TCP_OPT_SACK_PERMIT = 4 ; Selective Acknowledgement
		58	TCP_OPT_SACK = 5
		59	TCP_OPT_TIMESTAMP = 8
		60
		61	; Fundamental timer values
		62	TCP_time_MSL = 47 ; max segment lifetime (30s)
		63	TCP_time_re_min = 2 ; min retransmission (1,28s)
		64	TCP_time_re_max = 100 ; max retransmission (64s)
		65	TCP_time_pers_min = 8 ; min persist (5,12s)
		66	TCP_time_pers_max = 94 ; max persist (60,16s)
		67	TCP_time_keep_init = 118 ; connection establishment (75,52s)
		68	TCP_time_keep_idle = 4608 ; idle time before 1st probe (2h)
		69	TCP_time_keep_interval = 118 ; between probes when no response (75,52s)
		70	TCP_time_rtt_default = 5 ; default Round Trip Time (3,2s)
		71	TCP_time_srtt_default = 0 ;
		72	TCP_time_max_idle = 8*TCP_time_keep_interval ; FIXME
		73
4030	hidnplayr	74	TCP_time_connect = 300 ; in 1/100s (default=3s)
		75
3545	hidnplayr	76	; timer constants
		77	TCP_max_rxtshift = 12 ; max retransmissions waiting for ACK
		78	TCP_max_keepcnt = 8 ; max keepalive probes
		79
		80	;
		81	TCP_max_winshift = 14
		82	TCP_max_win = 65535
		83
		84	TCP_re_xmit_thresh = 3
		85
		86	TCP_mss_default = 1480 ; default max segment size
		87
		88	; smoothed round trip time and estimated variance are stored as fixed point numbers,
		89	; shifted by the value below.
		90	; With these scales, srtt has 3 bits to the right of the binary point, and thus an "alpha"
		91	; of .875. rttvar has 2 bits to the right and thus "alpha" of 0.75
		92	TCP_RTT_SHIFT = 3
		93	TCP_RTTVAR_SHIFT = 2
		94
		95	; bits used by tcp_input and tcp_output
		96	TCP_BIT_NEEDOUTPUT = 1 shl 0
		97	TCP_BIT_TIMESTAMP = 1 shl 1
		98	TCP_BIT_DROPSOCKET = 1 shl 2
5133	hidnplayr	99	TCP_BIT_FIN_IS_ACKED = 1 shl 3
3545	hidnplayr	100
		101	TCP_BIT_SENDALOT = 1 shl 0
		102
		103	TCP_PAWS_IDLE = 24246060100 ; 24 days, in 1/100 seconds
		104
		105	TCP_QUEUE_SIZE = 50
		106
		107	struct TCP_header
		108
		109	SourcePort dw ?
		110	DestinationPort dw ?
		111	SequenceNumber dd ?
		112	AckNumber dd ?
		113	DataOffset db ? ; DataOffset[0-3 bits] and Reserved[4-7]
		114	Flags db ? ; Reserved[0-1 bits]\|URG\|ACK\|PSH\|RST\|SYN\|FIN
		115	Window dw ?
		116	Checksum dw ?
		117	UrgentPointer dw ?
		118
		119	ends
		120
		121	struct TCP_queue_entry
		122
5133	hidnplayr	123	ip_ptr dd ?
		124	segment_ptr dd ?
		125	segment_size dd ?
		126	device_ptr dd ?
3545	hidnplayr	127
5133	hidnplayr	128	buffer_ptr dd ?
		129	timestamp dd ?
3545	hidnplayr	130
		131	ends
		132
3697	hidnplayr	133	uglobal
3545	hidnplayr	134	align 4
3697	hidnplayr	135
3600	hidnplayr	136	TCP_segments_tx rd NET_DEVICES_MAX
		137	TCP_segments_rx rd NET_DEVICES_MAX
		138	TCP_segments_missed rd NET_DEVICES_MAX
		139	TCP_segments_dumped rd NET_DEVICES_MAX
		140	; TCP_bytes_rx rq NET_DEVICES_MAX
		141	; TCP_bytes_tx rq NET_DEVICES_MAX
3545	hidnplayr	142	TCP_sequence_num dd ?
3697	hidnplayr	143	TCP_queue rd (TCP_QUEUE_SIZE*sizeof.TCP_queue_entry + sizeof.queue)/4
3545	hidnplayr	144	TCP_input_event dd ?
5013	hidnplayr	145	TCP_timer1_event dd ?
3545	hidnplayr	146	endg
		147
4387	hidnplayr	148	uglobal
		149	align 4
3545	hidnplayr	150
4387	hidnplayr	151	TCPS_accepts dd ? ; #SYNs received in LISTEN state
		152	TCPS_closed dd ? ; #connections closed (includes drops)
		153	TCPS_connattempt dd ? ; #connections initiated (calls to connect)
		154	TCPS_conndrops dd ? ; #embryonic connections dropped (before SYN received)
		155	TCPS_connects dd ? ; #connections established actively or passively
		156	TCPS_delack dd ? ; #delayed ACKs sent
		157	TCPS_drops dd ? ; #connections dropped (after SYN received)
		158	TCPS_keepdrops dd ? ; #connections dropped in keepalive (established or awaiting SYN)
		159	TCPS_keepprobe dd ? ; #keepalive probes sent
		160	TCPS_keeptimeo dd ? ; #times keepalive timer or connections-establishment timer expire
		161	TCPS_pawsdrop dd ? ; #segments dropped due to PAWS
		162	TCPS_pcbcachemiss dd ? ; #times PCB cache comparison fails
		163	TCPS_persisttimeo dd ? ; #times persist timer expires
		164	TCPS_predack dd ? ; #times header prediction correct for ACKs
		165	TCPS_preddat dd ? ; #times header prediction correct for data packets
		166	TCPS_rcvackbyte dd ? ; #bytes ACKed by received ACKs
		167	TCPS_rcvackpack dd ? ; #received ACK packets
		168	TCPS_rcvacktoomuch dd ? ; #received ACKs for unsent data
		169	TCPS_rcvafterclose dd ? ; #packets received after connection closed
		170	TCPS_rcvbadoff dd ? ; #packets received with invalid header length
		171	TCPS_rcvbadsum dd ? ; #packets received with checksum errors
		172	TCPS_rcvbyte dd ? ; #bytes received in sequence
		173	TCPS_rcvbyteafterwin dd ? ; #bytes received beyond advertised window
		174	TCPS_rcvdupack dd ? ; #duplicate ACKs received
		175	TCPS_rcvdupbyte dd ? ; #bytes receivedin completely duplicate packets
		176	TCPS_rcvduppack dd ? ; #packets received with completely duplicate bytes
		177	TCPS_rcvoobyte dd ? ; #out-of-order bytes received
		178	TCPS_rcvoopack dd ? ; #out-of-order packets received
		179	TCPS_rcvpack dd ? ; #packets received in sequence
		180	TCPS_rcvpackafterwin dd ? ; #packets with some data beyond advertised window
		181	TCPS_rcvpartdupbyte dd ? ; #duplicate bytes in part-duplicate packets
		182	TCPS_rcvpartduppack dd ? ; #packets with some duplicate data
		183	TCPS_rcvshort dd ? ; #packets received too short
		184	TCPS_rcvtotal dd ? ; #total packets received
		185	TCPS_rcvwinprobe dd ? ; #window probe packets received
		186	TCPS_rcvwinupd dd ? ; #received window update packets
		187	TCPS_rexmttimeo dd ? ; #retransmission timeouts
		188	TCPS_rttupdated dd ? ; #times RTT estimators updated
		189	TCPS_segstimed dd ? ; #segments for which TCP tried to measure RTT
		190	TCPS_sndacks dd ? ; #ACK-only packets sent (data length = 0)
		191	TCPS_sndbyte dd ? ; #data bytes sent
		192	TCPS_sndctrl dd ? ; #control (SYN, FIN, RST) packets sent (data length = 0)
		193	TCPS_sndpack dd ? ; #data packets sent (data length > 0)
		194	TCPS_sndprobe dd ? ; #window probes sent (1 byte of data forced by persist timer)
		195	TCPS_sndrexmitbyte dd ? ; #data bytes retransmitted
		196	TCPS_sndrexmitpack dd ? ; #data packets retransmitted
		197	TCPS_sndtotal dd ? ; total #packets sent
		198	TCPS_sndurg dd ? ; #packets sent with URG-only (data length=0)
		199	TCPS_sndwinup dd ? ; #window update-only packets sent (data length=0)
		200	TCPS_timeoutdrop dd ? ; #connections dropped in retransmission timeout
		201
		202	endg
		203
		204
3545	hidnplayr	205	;-----------------------------------------------------------------
		206	;
		207	; TCP_init
		208	;
		209	; This function resets all TCP variables
		210	;
		211	;-----------------------------------------------------------------
		212	macro TCP_init {
		213
		214	xor eax, eax
		215	mov edi, TCP_segments_tx
3600	hidnplayr	216	mov ecx, (6*NET_DEVICES_MAX)
3711	clevermous	217	rep stosd
3545	hidnplayr	218
		219	pseudo_random eax
		220	mov [TCP_sequence_num], eax
		221
		222	init_queue TCP_queue
		223
3598	clevermous	224	movi ebx, 1
3545	hidnplayr	225	mov ecx, TCP_process_input
		226	call new_sys_threads
3697	hidnplayr	227	test eax, eax
		228	jns @f
5013	hidnplayr	229	DEBUGF DEBUG_NETWORK_ERROR,'K : cannot create kernel thread for TCP input, error %d\n', eax
3697	hidnplayr	230	@@:
3545	hidnplayr	231
5013	hidnplayr	232	movi ebx, 1
		233	mov ecx, TCP_timer_640ms
		234	call new_sys_threads
		235	test eax, eax
		236	jns @f
		237	DEBUGF DEBUG_NETWORK_ERROR,'K : cannot create kernel thread for TCP timer, error %d\n', eax
		238	@@:
		239
3545	hidnplayr	240	}
		241
		242
		243	include 'tcp_timer.inc'
		244	include 'tcp_subr.inc'
		245	include 'tcp_usreq.inc'
		246	include 'tcp_input.inc'
		247	include 'tcp_output.inc'
		248
		249
		250	;---------------------------------------------------------------------------
		251	;
		252	; TCP_API
		253	;
		254	; This function is called by system function 76
		255	;
		256	; IN: subfunction number in bl
		257	; device number in bh
		258	; ecx, edx, .. depends on subfunction
		259	;
		260	; OUT:
		261	;
		262	;---------------------------------------------------------------------------
		263	align 4
		264	TCP_api:
		265
		266	movzx eax, bh
		267	shl eax, 2
		268
		269	test bl, bl
		270	jz .packets_tx ; 0
		271	dec bl
		272	jz .packets_rx ; 1
		273	dec bl
		274	jz .packets_missed ; 2
		275	dec bl
		276	jz .packets_dumped ; 3
5015	hidnplayr	277	dec bl
		278	jz .packets_queued ; 4
3545	hidnplayr	279
		280	.error:
		281	mov eax, -1
		282	ret
		283
		284	.packets_tx:
		285	mov eax, [TCP_segments_tx + eax]
		286	ret
		287
		288	.packets_rx:
		289	mov eax, [TCP_segments_rx + eax]
		290	ret
		291
		292	.packets_missed:
		293	mov eax, [TCP_segments_missed + eax]
		294	ret
		295
		296	.packets_dumped:
		297	mov eax, [TCP_segments_dumped + eax]
		298	ret
5015	hidnplayr	299
		300	.packets_queued:
		301	mov eax, [TCP_queue + queue.size]
		302	ret

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(root)/kernel/trunk/network/tcp.inc – Rev 5363