WebSVN – Kolibri OS – Blame – /kernel/branches/kolibri-process/network/udp.inc

Rev	Author	Line No.	Line
4429	Serge	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		2	;; ;;
5116	serge	3	;; Copyright (C) KolibriOS team 2004-2014. All rights reserved. ;;
4429	Serge	4	;; Distributed under terms of the GNU General Public License ;;
		5	;; ;;
		6	;; UDP.INC ;;
		7	;; ;;
		8	;; Part of the tcp/ip network stack for KolibriOS ;;
		9	;; ;;
		10	;; Written by hidnplayr@kolibrios.org ;;
		11	;; ;;
		12	;; GNU GENERAL PUBLIC LICENSE ;;
		13	;; Version 2, June 1991 ;;
		14	;; ;;
		15	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		16
5116	serge	17	$Revision: 5015 $
4429	Serge	18
		19
		20	struct UDP_header
		21
		22	SourcePort dw ?
		23	DestinationPort dw ?
		24	Length dw ? ; Length of (UDP Header + Data)
		25	Checksum dw ?
		26
		27	ends
		28
		29
		30	uglobal
		31	align 4
		32
		33	UDP_PACKETS_TX rd NET_DEVICES_MAX
		34	UDP_PACKETS_RX rd NET_DEVICES_MAX
		35
		36	endg
		37
		38
		39	;-----------------------------------------------------------------
		40	;
		41	; UDP_init
		42	;
		43	; This function resets all UDP variables
		44	;
		45	;-----------------------------------------------------------------
		46	macro UDP_init {
		47
		48	xor eax, eax
		49	mov edi, UDP_PACKETS_TX
		50	mov ecx, 2*NET_DEVICES_MAX
		51	rep stosd
		52	}
		53
		54
		55	macro UDP_checksum IP1, IP2 { ; esi = ptr to udp packet, ecx = packet size, destroys: ecx, edx
		56
		57	; Pseudoheader
		58	mov edx, IP_PROTO_UDP
		59
		60	add dl, [IP1+1]
		61	adc dh, [IP1+0]
		62	adc dl, [IP1+3]
		63	adc dh, [IP1+2]
		64
		65	adc dl, [IP2+1]
		66	adc dh, [IP2+0]
		67	adc dl, [IP2+3]
		68	adc dh, [IP2+2]
		69
		70	adc dl, cl ; byte[esi+UDP_header.Length+1]
		71	adc dh, ch ; byte[esi+UDP_header.Length+0]
		72
		73	; Done with pseudoheader, now do real header
		74	adc dl, byte[esi+UDP_header.SourcePort+1]
		75	adc dh, byte[esi+UDP_header.SourcePort+0]
		76
		77	adc dl, byte[esi+UDP_header.DestinationPort+1]
		78	adc dh, byte[esi+UDP_header.DestinationPort+0]
		79
		80	adc dl, byte[esi+UDP_header.Length+1]
		81	adc dh, byte[esi+UDP_header.Length+0]
		82
		83	adc edx, 0
		84
		85	; Done with header, now do data
		86	push esi
		87	movzx ecx, [esi+UDP_header.Length]
		88	rol cx , 8
		89	sub cx , sizeof.UDP_header
		90	add esi, sizeof.UDP_header
		91
		92	call checksum_1
		93	call checksum_2
		94	pop esi
		95
		96	add [esi+UDP_header.Checksum], dx ; this final instruction will set or clear ZF :)
		97
		98	}
		99
		100
		101	;-----------------------------------------------------------------
		102	;
		103	; UDP_input:
		104	;
		105	; Called by IPv4_input,
		106	; this procedure will inject the udp data diagrams in the application sockets.
		107	;
		108	; IN: [esp] = Pointer to buffer
		109	; [esp+4] = size of buffer
		110	; ebx = ptr to device struct
		111	; ecx = UDP Packet size
		112	; esi = ptr to UDP header
		113	; edi = ptr to ipv4 source and dest address
		114	;
		115	; OUT: /
		116	;
		117	;-----------------------------------------------------------------
		118	align 4
		119	UDP_input:
		120
		121	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: size=%u\n", ecx
		122
		123	; First validate, checksum
		124
		125	neg [esi + UDP_header.Checksum] ; substract checksum from 0
		126	jz .no_checksum ; if checksum is zero, it is considered valid
		127
		128	; otherwise, we will re-calculate the checksum and add it to this value, thus creating 0 when it is correct
		129
		130	UDP_checksum (edi), (edi+4)
		131	jnz .checksum_mismatch
		132
		133	.no_checksum:
		134	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: checksum ok\n"
		135
		136	; Convert length to little endian
		137
		138	rol [esi + UDP_header.Length], 8
		139
		140	; Look for a socket where
		141	; IP Packet UDP Destination Port = local Port
		142	; IP Packet SA = Remote IP
		143
		144	pusha
		145	mov ecx, socket_mutex
		146	call mutex_lock
		147	popa
		148
		149	mov cx, [esi + UDP_header.SourcePort]
		150	mov dx, [esi + UDP_header.DestinationPort]
		151	mov edi, [edi + 4] ; ipv4 source address
		152	mov eax, net_sockets
		153
		154	.next_socket:
		155	mov eax, [eax + SOCKET.NextPtr]
		156	or eax, eax
		157	jz .dump_
		158
		159	cmp [eax + SOCKET.Domain], AF_INET4
		160	jne .next_socket
		161
		162	cmp [eax + SOCKET.Protocol], IP_PROTO_UDP
		163	jne .next_socket
		164
		165	cmp [eax + UDP_SOCKET.LocalPort], dx
		166	jne .next_socket
		167
		168	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: socket=%x\n", eax
		169
		170	pusha
		171	mov ecx, socket_mutex
		172	call mutex_unlock
		173	popa
		174
		175	;;; TODO: when packet is processed, check more sockets!
		176
		177	; cmp [eax + IP_SOCKET.RemoteIP], 0xffffffff
		178	; je @f
		179	; cmp [eax + IP_SOCKET.RemoteIP], edi
		180	; jne .next_socket
		181	; @@:
		182	;
		183	; FIXME: UDP should check remote IP, but not under all circumstances!
		184
		185	cmp [eax + UDP_SOCKET.RemotePort], 0
		186	je .updateport
		187
		188	cmp [eax + UDP_SOCKET.RemotePort], cx
		189	jne .dump
		190
		191	pusha
		192	lea ecx, [eax + SOCKET.mutex]
		193	call mutex_lock
		194	popa
		195
		196	.updatesock:
		197	call NET_ptr_to_num4
		198	inc [UDP_PACKETS_RX + edi]
		199
		200	movzx ecx, [esi + UDP_header.Length]
		201	sub ecx, sizeof.UDP_header
		202	add esi, sizeof.UDP_header
		203
		204	jmp SOCKET_input
		205
		206	.updateport:
		207	pusha
		208	lea ecx, [eax + SOCKET.mutex]
		209	call mutex_lock
		210	popa
		211
		212	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: new remote port=%x\n", cx ; FIXME: find a way to print big endian values with debugf
		213	mov [eax + UDP_SOCKET.RemotePort], cx
		214	jmp .updatesock
		215
		216	.dump_:
		217
		218	pusha
		219	mov ecx, socket_mutex
		220	call mutex_unlock
		221	popa
		222
		223	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: no socket found\n"
		224
		225	jmp .dump
		226
		227	.checksum_mismatch:
		228	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: checksum mismatch\n"
		229
		230	.dump:
		231	call NET_packet_free
		232	add esp, 4 ; pop (balance stack)
		233	DEBUGF DEBUG_NETWORK_VERBOSE,"UDP_input: dumping\n"
		234
		235	ret
		236
		237
		238
		239
		240	;-----------------------------------------------------------------
		241	;
		242	; UDP_output
		243	;
		244	; IN: eax = socket pointer
		245	; ecx = number of bytes to send
		246	; esi = pointer to data
		247	;
5116	serge	248	; OUT: eax = -1 on error
		249	;
4429	Serge	250	;-----------------------------------------------------------------
		251
		252	align 4
		253	UDP_output:
		254
		255	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: socket=%x bytes=%u data_ptr=%x\n", eax, ecx, esi
		256
		257	mov dx, [eax + UDP_SOCKET.RemotePort]
		258	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: remote port=%x, ", dx ; FIXME: find a way to print big endian values with debugf
		259	rol edx, 16
		260	mov dx, [eax + UDP_SOCKET.LocalPort]
		261	DEBUGF DEBUG_NETWORK_VERBOSE, "local port=%x\n", dx
		262
		263	sub esp, 8 ; Data ptr and data size will be placed here
		264	push edx esi
		265	mov edx, [eax + IP_SOCKET.LocalIP]
		266	mov eax, [eax + IP_SOCKET.RemoteIP]
		267	mov di, IP_PROTO_UDP shl 8 + 128
		268	add ecx, sizeof.UDP_header
		269	call IPv4_output
		270	jz .fail
		271	mov [esp + 8], eax ; pointer to buffer start
		272	mov [esp + 8 + 4], edx ; buffer size
		273
		274	mov [edi + UDP_header.Length], cx
		275	rol [edi + UDP_header.Length], 8
		276
		277	pop esi
		278	push edi ecx
		279	sub ecx, sizeof.UDP_header
		280	add edi, sizeof.UDP_header
		281	shr ecx, 2
		282	rep movsd
		283	mov ecx, [esp]
		284	and ecx, 3
		285	rep movsb
		286	pop ecx edi
		287
		288	pop dword [edi + UDP_header.SourcePort]
		289
		290	; Checksum
		291	mov esi, edi
		292	mov [edi + UDP_header.Checksum], 0
		293	UDP_checksum (edi-4), (edi-8) ; FIXME: IPv4 packet could have options..
		294
		295	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: sending with device %x\n", ebx
		296	call [ebx + NET_DEVICE.transmit]
		297	test eax, eax
		298	jnz @f
		299	call NET_ptr_to_num4
		300	inc [UDP_PACKETS_TX + edi]
		301	@@:
		302
		303	ret
		304
		305	.fail:
		306	DEBUGF DEBUG_NETWORK_ERROR, "UDP_output: failed\n"
		307	add esp, 4+4+8
		308	or eax, -1
		309	ret
		310
		311
		312
		313
		314	;-----------------------------------------------------------------
		315	;
		316	; UDP_connect
		317	;
		318	; IN: eax = socket pointer
		319	; OUT: eax = 0 ok / -1 error
		320	; ebx = error code
		321	;
		322	;-------------------------
		323	align 4
		324	UDP_connect:
		325
		326	test [eax + SOCKET.state], SS_ISCONNECTED
		327	jz @f
		328	call UDP_disconnect
		329	@@:
		330
		331	push eax edx
		332	lea ecx, [eax + SOCKET.mutex]
		333	call mutex_lock
		334	pop edx eax
		335
		336	; Fill in local IP
		337	cmp [eax + IP_SOCKET.LocalIP], 0
		338	jne @f
		339	push [IP_LIST + 4] ; FIXME: use correct local IP
		340	pop [eax + IP_SOCKET.LocalIP]
		341
		342	; Fill in remote port and IP, overwriting eventually previous values
		343	pushw [edx + 2]
		344	pop [eax + UDP_SOCKET.RemotePort]
		345
		346	pushd [edx + 4]
		347	pop [eax + IP_SOCKET.RemoteIP]
		348
		349	; Find a local port, if user didnt define one
		350	cmp [eax + UDP_SOCKET.LocalPort], 0
		351	jne @f
		352	call SOCKET_find_port
		353	@@:
		354
		355	push eax
		356	init_queue (eax + SOCKET_QUEUE_LOCATION) ; Set up data receiving queue
		357	pop eax
		358
		359	push eax
		360	lea ecx, [eax + SOCKET.mutex]
		361	call mutex_unlock
		362	pop eax
		363
		364	call SOCKET_is_connected
		365
		366	xor eax, eax
		367	ret
		368
		369
		370	;-----------------------------------------------------------------
		371	;
		372	; UDP_disconnect
		373	;
		374	; IN: eax = socket pointer
		375	; OUT: eax = socket pointer
		376	;
		377	;-------------------------
		378	align 4
		379	UDP_disconnect:
		380
		381	; TODO: remove the pending received data
		382
		383	call SOCKET_is_disconnected
		384
		385	ret
		386
		387
		388
		389
		390
		391	;---------------------------------------------------------------------------
		392	;
		393	; UDP_API
		394	;
		395	; This function is called by system function 75
		396	;
		397	; IN: subfunction number in bl
		398	; device number in bh
		399	; ecx, edx, .. depends on subfunction
		400	;
		401	; OUT:
		402	;
		403	;---------------------------------------------------------------------------
		404
		405	align 4
		406	UDP_api:
		407
		408	movzx eax, bh
		409	shl eax, 2
		410
		411	test bl, bl
		412	jz .packets_tx ; 0
		413	dec bl
		414	jz .packets_rx ; 1
		415
		416	.error:
		417	mov eax, -1
		418	ret
		419
		420	.packets_tx:
		421	mov eax, [UDP_PACKETS_TX + eax]
		422	ret
		423
		424	.packets_rx:
		425	mov eax, [UDP_PACKETS_RX + eax]
		426	ret

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(root)/kernel/branches/kolibri-process/network/udp.inc – Rev 5116