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

Rev	Author	Line No.	Line
3545	hidnplayr	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		2	;; ;;
3861	hidnplayr	3	;; Copyright (C) KolibriOS team 2004-2013. All rights reserved. ;;
3545	hidnplayr	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
4850	mario79	17	$Revision: 4850 $
3545	hidnplayr	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
3698	hidnplayr	30	uglobal
3545	hidnplayr	31	align 4
3698	hidnplayr	32
3600	hidnplayr	33	UDP_PACKETS_TX rd NET_DEVICES_MAX
		34	UDP_PACKETS_RX rd NET_DEVICES_MAX
3698	hidnplayr	35
3545	hidnplayr	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
3600	hidnplayr	50	mov ecx, 2*NET_DEVICES_MAX
3711	clevermous	51	rep stosd
3545	hidnplayr	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
3556	hidnplayr	121	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: size=%u\n", ecx
3545	hidnplayr	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:
3556	hidnplayr	134	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: checksum ok\n"
3545	hidnplayr	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
3647	hidnplayr	144	pusha
		145	mov ecx, socket_mutex
		146	call mutex_lock
		147	popa
		148
3545	hidnplayr	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
3647	hidnplayr	157	jz .dump_
3545	hidnplayr	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
3556	hidnplayr	168	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: socket=%x\n", eax
3545	hidnplayr	169
3647	hidnplayr	170	pusha
		171	mov ecx, socket_mutex
		172	call mutex_unlock
		173	popa
		174
3545	hidnplayr	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
4030	hidnplayr	185	cmp [eax + UDP_SOCKET.RemotePort], 0
3545	hidnplayr	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:
3643	hidnplayr	197	call NET_ptr_to_num4
		198	inc [UDP_PACKETS_RX + edi]
3545	hidnplayr	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
3556	hidnplayr	212	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: new remote port=%x\n", cx ; FIXME: find a way to print big endian values with debugf
3545	hidnplayr	213	mov [eax + UDP_SOCKET.RemotePort], cx
		214	jmp .updatesock
		215
3647	hidnplayr	216	.dump_:
3545	hidnplayr	217
3647	hidnplayr	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
3545	hidnplayr	227	.checksum_mismatch:
3556	hidnplayr	228	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: checksum mismatch\n"
3545	hidnplayr	229
		230	.dump:
3861	hidnplayr	231	call NET_packet_free
3545	hidnplayr	232	add esp, 4 ; pop (balance stack)
3556	hidnplayr	233	DEBUGF DEBUG_NETWORK_VERBOSE,"UDP_input: dumping\n"
3545	hidnplayr	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	;
		248	;-----------------------------------------------------------------
		249
		250	align 4
		251	UDP_output:
		252
3556	hidnplayr	253	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: socket=%x bytes=%u data_ptr=%x\n", eax, ecx, esi
3545	hidnplayr	254
		255	mov dx, [eax + UDP_SOCKET.RemotePort]
3556	hidnplayr	256	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: remote port=%x, ", dx ; FIXME: find a way to print big endian values with debugf
3545	hidnplayr	257	rol edx, 16
		258	mov dx, [eax + UDP_SOCKET.LocalPort]
3556	hidnplayr	259	DEBUGF DEBUG_NETWORK_VERBOSE, "local port=%x\n", dx
3545	hidnplayr	260
		261	sub esp, 8 ; Data ptr and data size will be placed here
		262	push edx esi
		263	mov edx, [eax + IP_SOCKET.LocalIP]
		264	mov eax, [eax + IP_SOCKET.RemoteIP]
		265	mov di, IP_PROTO_UDP shl 8 + 128
		266	add ecx, sizeof.UDP_header
		267	call IPv4_output
		268	jz .fail
		269	mov [esp + 8], eax ; pointer to buffer start
		270	mov [esp + 8 + 4], edx ; buffer size
		271
		272	mov [edi + UDP_header.Length], cx
		273	rol [edi + UDP_header.Length], 8
		274
		275	pop esi
		276	push edi ecx
		277	sub ecx, sizeof.UDP_header
		278	add edi, sizeof.UDP_header
		279	shr ecx, 2
3711	clevermous	280	rep movsd
3545	hidnplayr	281	mov ecx, [esp]
		282	and ecx, 3
3711	clevermous	283	rep movsb
3545	hidnplayr	284	pop ecx edi
		285
		286	pop dword [edi + UDP_header.SourcePort]
		287
		288	; Checksum
		289	mov esi, edi
		290	mov [edi + UDP_header.Checksum], 0
		291	UDP_checksum (edi-4), (edi-8) ; FIXME: IPv4 packet could have options..
		292
3556	hidnplayr	293	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: sending with device %x\n", ebx
3545	hidnplayr	294	call [ebx + NET_DEVICE.transmit]
		295	test eax, eax
		296	jnz @f
3643	hidnplayr	297	call NET_ptr_to_num4
		298	inc [UDP_PACKETS_TX + edi]
3545	hidnplayr	299	@@:
		300
		301	ret
		302
		303	.fail:
3556	hidnplayr	304	DEBUGF DEBUG_NETWORK_ERROR, "UDP_output: failed\n"
3545	hidnplayr	305	add esp, 4+4+8
		306	or eax, -1
		307	ret
		308
		309
		310
4030	hidnplayr	311
		312	;-----------------------------------------------------------------
		313	;
		314	; UDP_connect
		315	;
		316	; IN: eax = socket pointer
		317	; OUT: eax = 0 ok / -1 error
		318	; ebx = error code
		319	;
		320	;-------------------------
		321	align 4
		322	UDP_connect:
		323
		324	test [eax + SOCKET.state], SS_ISCONNECTED
		325	jz @f
		326	call UDP_disconnect
		327	@@:
		328
4035	hidnplayr	329	push eax edx
4030	hidnplayr	330	lea ecx, [eax + SOCKET.mutex]
		331	call mutex_lock
4035	hidnplayr	332	pop edx eax
4030	hidnplayr	333
		334	; Fill in local IP
		335	cmp [eax + IP_SOCKET.LocalIP], 0
		336	jne @f
		337	push [IP_LIST + 4] ; FIXME: use correct local IP
		338	pop [eax + IP_SOCKET.LocalIP]
		339
		340	; Fill in remote port and IP, overwriting eventually previous values
		341	pushw [edx + 2]
		342	pop [eax + UDP_SOCKET.RemotePort]
		343
		344	pushd [edx + 4]
		345	pop [eax + IP_SOCKET.RemoteIP]
		346
		347	; Find a local port, if user didnt define one
		348	cmp [eax + UDP_SOCKET.LocalPort], 0
		349	jne @f
		350	call SOCKET_find_port
		351	@@:
		352
		353	push eax
		354	init_queue (eax + SOCKET_QUEUE_LOCATION) ; Set up data receiving queue
		355	pop eax
		356
		357	push eax
		358	lea ecx, [eax + SOCKET.mutex]
		359	call mutex_unlock
		360	pop eax
		361
		362	call SOCKET_is_connected
		363
		364	xor eax, eax
		365	ret
		366
		367
		368	;-----------------------------------------------------------------
		369	;
		370	; UDP_disconnect
		371	;
		372	; IN: eax = socket pointer
		373	; OUT: eax = socket pointer
		374	;
		375	;-------------------------
		376	align 4
		377	UDP_disconnect:
		378
		379	; TODO: remove the pending received data
		380
		381	call SOCKET_is_disconnected
		382
		383	ret
		384
		385
		386
		387
		388
3545	hidnplayr	389	;---------------------------------------------------------------------------
		390	;
		391	; UDP_API
		392	;
		393	; This function is called by system function 75
		394	;
		395	; IN: subfunction number in bl
		396	; device number in bh
		397	; ecx, edx, .. depends on subfunction
		398	;
		399	; OUT:
		400	;
		401	;---------------------------------------------------------------------------
		402
		403	align 4
		404	UDP_api:
		405
		406	movzx eax, bh
		407	shl eax, 2
		408
		409	test bl, bl
		410	jz .packets_tx ; 0
		411	dec bl
		412	jz .packets_rx ; 1
		413
		414	.error:
		415	mov eax, -1
		416	ret
		417
		418	.packets_tx:
		419	mov eax, [UDP_PACKETS_TX + eax]
		420	ret
		421
		422	.packets_rx:
		423	mov eax, [UDP_PACKETS_RX + eax]
		424	ret

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(root)/kernel/trunk/network/udp.inc – Rev 4850