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

Rev	Author	Line No.	Line
3545	hidnplayr	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		2	;; ;;
		3	;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;
		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
		17	$Revision: 2995 $
		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	align 4
		31	uglobal
3600	hidnplayr	32	UDP_PACKETS_TX rd NET_DEVICES_MAX
		33	UDP_PACKETS_RX rd NET_DEVICES_MAX
3545	hidnplayr	34	endg
		35
		36
		37	;-----------------------------------------------------------------
		38	;
		39	; UDP_init
		40	;
		41	; This function resets all UDP variables
		42	;
		43	;-----------------------------------------------------------------
		44	macro UDP_init {
		45
		46	xor eax, eax
		47	mov edi, UDP_PACKETS_TX
3600	hidnplayr	48	mov ecx, 2*NET_DEVICES_MAX
3545	hidnplayr	49	rep stosd
		50	}
		51
		52
		53	macro UDP_checksum IP1, IP2 { ; esi = ptr to udp packet, ecx = packet size, destroys: ecx, edx
		54
		55	; Pseudoheader
		56	mov edx, IP_PROTO_UDP
		57
		58	add dl, [IP1+1]
		59	adc dh, [IP1+0]
		60	adc dl, [IP1+3]
		61	adc dh, [IP1+2]
		62
		63	adc dl, [IP2+1]
		64	adc dh, [IP2+0]
		65	adc dl, [IP2+3]
		66	adc dh, [IP2+2]
		67
		68	adc dl, cl ; byte[esi+UDP_header.Length+1]
		69	adc dh, ch ; byte[esi+UDP_header.Length+0]
		70
		71	; Done with pseudoheader, now do real header
		72	adc dl, byte[esi+UDP_header.SourcePort+1]
		73	adc dh, byte[esi+UDP_header.SourcePort+0]
		74
		75	adc dl, byte[esi+UDP_header.DestinationPort+1]
		76	adc dh, byte[esi+UDP_header.DestinationPort+0]
		77
		78	adc dl, byte[esi+UDP_header.Length+1]
		79	adc dh, byte[esi+UDP_header.Length+0]
		80
		81	adc edx, 0
		82
		83	; Done with header, now do data
		84	push esi
		85	movzx ecx, [esi+UDP_header.Length]
		86	rol cx , 8
		87	sub cx , sizeof.UDP_header
		88	add esi, sizeof.UDP_header
		89
		90	call checksum_1
		91	call checksum_2
		92	pop esi
		93
		94	add [esi+UDP_header.Checksum], dx ; this final instruction will set or clear ZF :)
		95
		96	}
		97
		98
		99	;-----------------------------------------------------------------
		100	;
		101	; UDP_input:
		102	;
		103	; Called by IPv4_input,
		104	; this procedure will inject the udp data diagrams in the application sockets.
		105	;
		106	; IN: [esp] = Pointer to buffer
		107	; [esp+4] = size of buffer
		108	; ebx = ptr to device struct
		109	; ecx = UDP Packet size
		110	; esi = ptr to UDP header
		111	; edi = ptr to ipv4 source and dest address
		112	;
		113	; OUT: /
		114	;
		115	;-----------------------------------------------------------------
		116	align 4
		117	UDP_input:
		118
3556	hidnplayr	119	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: size=%u\n", ecx
3545	hidnplayr	120
		121	; First validate, checksum
		122
		123	neg [esi + UDP_header.Checksum] ; substract checksum from 0
		124	jz .no_checksum ; if checksum is zero, it is considered valid
		125
		126	; otherwise, we will re-calculate the checksum and add it to this value, thus creating 0 when it is correct
		127
		128	UDP_checksum (edi), (edi+4)
		129	jnz .checksum_mismatch
		130
		131	.no_checksum:
3556	hidnplayr	132	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: checksum ok\n"
3545	hidnplayr	133
		134	; Convert length to little endian
		135
		136	rol [esi + UDP_header.Length], 8
		137
		138	; Look for a socket where
		139	; IP Packet UDP Destination Port = local Port
		140	; IP Packet SA = Remote IP
		141
3647	hidnplayr	142	pusha
		143	mov ecx, socket_mutex
		144	call mutex_lock
		145	popa
		146
3545	hidnplayr	147	mov cx, [esi + UDP_header.SourcePort]
		148	mov dx, [esi + UDP_header.DestinationPort]
		149	mov edi, [edi + 4] ; ipv4 source address
		150	mov eax, net_sockets
		151
		152	.next_socket:
		153	mov eax, [eax + SOCKET.NextPtr]
		154	or eax, eax
3647	hidnplayr	155	jz .dump_
3545	hidnplayr	156
		157	cmp [eax + SOCKET.Domain], AF_INET4
		158	jne .next_socket
		159
		160	cmp [eax + SOCKET.Protocol], IP_PROTO_UDP
		161	jne .next_socket
		162
		163	cmp [eax + UDP_SOCKET.LocalPort], dx
		164	jne .next_socket
		165
3556	hidnplayr	166	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: socket=%x\n", eax
3545	hidnplayr	167
3647	hidnplayr	168	pusha
		169	mov ecx, socket_mutex
		170	call mutex_unlock
		171	popa
		172
3545	hidnplayr	173	;;; TODO: when packet is processed, check more sockets!
		174
		175	; cmp [eax + IP_SOCKET.RemoteIP], 0xffffffff
		176	; je @f
		177	; cmp [eax + IP_SOCKET.RemoteIP], edi
		178	; jne .next_socket
		179	; @@:
		180	;
		181	; FIXME: UDP should check remote IP, but not under all circumstances!
		182
		183	cmp [eax + UDP_SOCKET.firstpacket], 0
		184	je .updateport
		185
		186	cmp [eax + UDP_SOCKET.RemotePort], cx
		187	jne .dump
		188
		189	pusha
		190	lea ecx, [eax + SOCKET.mutex]
		191	call mutex_lock
		192	popa
		193
		194	.updatesock:
3643	hidnplayr	195	call NET_ptr_to_num4
		196	inc [UDP_PACKETS_RX + edi]
3545	hidnplayr	197
		198	movzx ecx, [esi + UDP_header.Length]
		199	sub ecx, sizeof.UDP_header
		200	add esi, sizeof.UDP_header
		201
		202	jmp SOCKET_input
		203
		204	.updateport:
		205	pusha
		206	lea ecx, [eax + SOCKET.mutex]
		207	call mutex_lock
		208	popa
		209
3556	hidnplayr	210	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	211	mov [eax + UDP_SOCKET.RemotePort], cx
		212	inc [eax + UDP_SOCKET.firstpacket]
		213
		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:
		231	call kernel_free
		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 ebx, [eax + SOCKET.device]
		264	mov edx, [eax + IP_SOCKET.LocalIP]
		265	mov eax, [eax + IP_SOCKET.RemoteIP]
		266	mov di, IP_PROTO_UDP shl 8 + 128
		267	add ecx, sizeof.UDP_header
		268	call IPv4_output
		269	jz .fail
		270	mov [esp + 8], eax ; pointer to buffer start
		271	mov [esp + 8 + 4], edx ; buffer size
		272
		273	mov [edi + UDP_header.Length], cx
		274	rol [edi + UDP_header.Length], 8
		275
		276	pop esi
		277	push edi ecx
		278	sub ecx, sizeof.UDP_header
		279	add edi, sizeof.UDP_header
		280	shr ecx, 2
		281	rep movsd
		282	mov ecx, [esp]
		283	and ecx, 3
		284	rep movsb
		285	pop ecx edi
		286
		287	pop dword [edi + UDP_header.SourcePort]
		288
		289	; Checksum
		290	mov esi, edi
		291	mov [edi + UDP_header.Checksum], 0
		292	UDP_checksum (edi-4), (edi-8) ; FIXME: IPv4 packet could have options..
		293
3556	hidnplayr	294	DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: sending with device %x\n", ebx
3545	hidnplayr	295	call [ebx + NET_DEVICE.transmit]
		296	test eax, eax
		297	jnz @f
3643	hidnplayr	298	call NET_ptr_to_num4
		299	inc [UDP_PACKETS_TX + edi]
3545	hidnplayr	300	@@:
		301
		302	ret
		303
		304	.fail:
3556	hidnplayr	305	DEBUGF DEBUG_NETWORK_ERROR, "UDP_output: failed\n"
3545	hidnplayr	306	add esp, 4+4+8
		307	or eax, -1
		308	ret
		309
		310
		311
		312	;---------------------------------------------------------------------------
		313	;
		314	; UDP_API
		315	;
		316	; This function is called by system function 75
		317	;
		318	; IN: subfunction number in bl
		319	; device number in bh
		320	; ecx, edx, .. depends on subfunction
		321	;
		322	; OUT:
		323	;
		324	;---------------------------------------------------------------------------
		325
		326	align 4
		327	UDP_api:
		328
		329	movzx eax, bh
		330	shl eax, 2
		331
		332	test bl, bl
		333	jz .packets_tx ; 0
		334	dec bl
		335	jz .packets_rx ; 1
		336
		337	.error:
		338	mov eax, -1
		339	ret
		340
		341	.packets_tx:
		342	mov eax, [UDP_PACKETS_TX + eax]
		343	ret
		344
		345	.packets_rx:
		346	mov eax, [UDP_PACKETS_RX + eax]
		347	ret

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(root)/kernel/trunk/network/udp.inc @ 3711 – Rev 3647