WebSVN – Kolibri OS – Blame – /kernel/trunk/network/IPv4.inc

Rev	Author	Line No.	Line
3545	hidnplayr	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		2	;; ;;
9800	Boppan	3	;; Copyright (C) KolibriOS team 2004-2022. All rights reserved. ;;
3545	hidnplayr	4	;; Distributed under terms of the GNU General Public License ;;
		5	;; ;;
		6	;; IPv4.INC ;;
		7	;; ;;
		8	;; Part of the TCP/IP network stack for KolibriOS ;;
		9	;; ;;
		10	;; Based on the work of [Johnny_B] and [smb] ;;
		11	;; ;;
		12	;; Written by hidnplayr@kolibrios.org ;;
		13	;; ;;
		14	;; GNU GENERAL PUBLIC LICENSE ;;
		15	;; Version 2, June 1991 ;;
		16	;; ;;
		17	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		18
4850	mario79	19	$Revision: 9807 $
3545	hidnplayr	20
4053	hidnplayr	21	IPv4_MAX_FRAGMENTS = 64
4387	hidnplayr	22	IPv4_MAX_ROUTES = 64
3545	hidnplayr	23
4387	hidnplayr	24	IPv4_ROUTE_FLAG_UP = 1 shl 0
		25	IPv4_ROUTE_FLAG_GATEWAY = 1 shl 1
		26	IPv4_ROUTE_FLAG_HOST = 1 shl 2
		27	IPv4_ROUTE_FLAG_D = 1 shl 3 ; Route was created by a redirect
		28	IPv4_ROUTE_FLAG_M = 1 shl 4 ; Route was modified by a redirect
		29
3545	hidnplayr	30	struct IPv4_header
		31
		32	VersionAndIHL db ? ; Version[0-3 bits] and IHL(header length)[4-7 bits]
		33	TypeOfService db ? ; precedence [7-5] minimize delay [4], maximize throughput [3], maximize riliability [2] minimize momentary cost [1] and zero [0]
		34	TotalLength dw ?
		35	Identification dw ?
		36	FlagsAndFragmentOffset dw ? ; Flags[0-2] and FragmentOffset[3-15]
		37	TimeToLive db ? ;
		38	Protocol db ?
		39	HeaderChecksum dw ?
		40	SourceAddress dd ?
		41	DestinationAddress dd ?
		42
		43	ends
		44
4052	hidnplayr	45	struct IPv4_FRAGMENT_slot
3545	hidnplayr	46
		47	ttl dw ? ; Time to live for this entry, 0 for empty slot's
		48	id dw ? ; Identification field from IP header
		49	SrcIP dd ? ; .. from IP header
		50	DstIP dd ? ; .. from IP header
		51	ptr dd ? ; Pointer to first packet
		52
		53	ends
		54
4052	hidnplayr	55	struct IPv4_FRAGMENT_entry ; This structure will replace the ethernet header in fragmented ip packets
3545	hidnplayr	56
		57	PrevPtr dd ? ; Pointer to previous fragment entry (-1 for first packet)
		58	NextPtr dd ? ; Pointer to next fragment entry (-1 for last packet)
		59	Owner dd ? ; Pointer to structure of driver
		60	rb 2 ; to match ethernet header size ;;; FIXME
		61	; Ip header begins here (we will need the IP header to re-construct the complete packet)
		62	ends
		63
7678	hidnplayr	64	;struct IPv4_ROUTE
		65	;
		66	; Destination dd ?
		67	; Gateway dd ?
		68	; Flags dd ?
		69	; Use dd ?
		70	; Interface dd ?
		71	;
		72	;ends
3545	hidnplayr	73
3698	hidnplayr	74	uglobal
3545	hidnplayr	75	align 4
		76
7678	hidnplayr	77	IPv4_address rd NET_DEVICES_MAX
		78	IPv4_subnet rd NET_DEVICES_MAX
		79	IPv4_nameserver rd NET_DEVICES_MAX
		80	IPv4_gateway rd NET_DEVICES_MAX
		81	IPv4_broadcast rd NET_DEVICES_MAX
3545	hidnplayr	82
4052	hidnplayr	83	IPv4_packets_tx rd NET_DEVICES_MAX
		84	IPv4_packets_rx rd NET_DEVICES_MAX
		85	IPv4_packets_dumped rd NET_DEVICES_MAX
3545	hidnplayr	86
7678	hidnplayr	87	IPv4_fragments rb IPv4_MAX_FRAGMENTS * sizeof.IPv4_FRAGMENT_slot
3698	hidnplayr	88
7678	hidnplayr	89	; IPv4_routes rd IPv4_MAX_ROUTES * sizeof.IPv4_ROUTE
9801	Boppan	90	edi_saved rd 1
4387	hidnplayr	91
3545	hidnplayr	92	endg
		93
		94
6011	hidnplayr	95	;-----------------------------------------------------------------;
		96	; ;
		97	; ipv4_init: Resets all IPv4 variables ;
		98	; ;
		99	;-----------------------------------------------------------------;
		100	macro ipv4_init {
3545	hidnplayr	101
		102	xor eax, eax
7678	hidnplayr	103	mov edi, IPv4_address
4052	hidnplayr	104	mov ecx, 7NET_DEVICES_MAX + (sizeof.IPv4_FRAGMENT_slotIPv4_MAX_FRAGMENTS)/4
3711	clevermous	105	rep stosd
3545	hidnplayr	106
		107	}
		108
		109
6011	hidnplayr	110	;-----------------------------------------------------------------;
		111	; ;
		112	; Decrease TimeToLive of all fragment slots ;
		113	; ;
		114	;-----------------------------------------------------------------;
		115	macro ipv4_decrease_fragment_ttls {
3545	hidnplayr	116
		117	local .loop, .next
		118
7678	hidnplayr	119	mov esi, IPv4_fragments
4052	hidnplayr	120	mov ecx, IPv4_MAX_FRAGMENTS
3545	hidnplayr	121	.loop:
4052	hidnplayr	122	cmp [esi + IPv4_FRAGMENT_slot.ttl], 0
3545	hidnplayr	123	je .next
4052	hidnplayr	124	dec [esi + IPv4_FRAGMENT_slot.ttl]
3545	hidnplayr	125	jz .died
		126	.next:
4052	hidnplayr	127	add esi, sizeof.IPv4_FRAGMENT_slot
3545	hidnplayr	128	dec ecx
		129	jnz .loop
		130	jmp .done
		131
		132	.died:
3556	hidnplayr	133	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4 Fragment slot timed-out!\n"
3545	hidnplayr	134	;;; TODO: clear all entry's of timed-out slot
		135	jmp .next
		136
		137	.done:
		138	}
		139
		140
		141
6011	hidnplayr	142	macro ipv4_checksum ptr {
3545	hidnplayr	143
		144	; This is the fast procedure to create or check an IP header without options
		145	; To create a new checksum, the checksum field must be set to 0 before computation
		146	; To check an existing checksum, leave the checksum as is, and it will be 0 after this procedure, if it was correct
		147
		148	push ebx
		149	xor ebx, ebx
		150	add bl, [ptr+1]
		151	adc bh, [ptr+0]
		152
		153	adc bl, [ptr+3]
		154	adc bh, [ptr+2]
		155
		156	adc bl, [ptr+5]
		157	adc bh, [ptr+4]
		158
		159	adc bl, [ptr+7]
		160	adc bh, [ptr+6]
		161
		162	adc bl, [ptr+9]
		163	adc bh, [ptr+8]
		164
		165	; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation
		166
		167	adc bl, [ptr+13]
		168	adc bh, [ptr+12]
		169
		170	adc bl, [ptr+15]
		171	adc bh, [ptr+14]
		172
		173	adc bl, [ptr+17]
		174	adc bh, [ptr+16]
		175
		176	adc bl, [ptr+19]
		177	adc bh, [ptr+18]
		178
		179	adc ebx, 0
		180
		181	push ecx
		182	mov ecx, ebx
		183	shr ecx, 16
		184	and ebx, 0xffff
		185	add ebx, ecx
		186
		187	mov ecx, ebx
		188	shr ecx, 16
		189	add ebx, ecx
		190
		191	not bx
		192	jnz .not_zero
		193	dec bx
		194	.not_zero:
		195	xchg bl, bh
		196	pop ecx
		197
		198	neg word [ptr+10] ; zero will stay zero so we just get the checksum
		199	add word [ptr+10], bx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :)
		200	pop ebx
		201
		202	}
		203
		204
		205
6011	hidnplayr	206	;-----------------------------------------------------------------;
		207	; ;
		208	; ipv4_input: Check if IPv4 Packet isnt damaged and call ;
		209	; appropriate handler. (TCP/UDP/ICMP/..) ;
		210	; We will also re-construct fragmented packets. ;
		211	; ;
		212	; IN: Pointer to buffer in [esp] ;
		213	; pointer to device struct in ebx ;
		214	; pointer to IPv4 header in edx ;
		215	; size of IPv4 packet in ecx ;
		216	; ;
		217	; OUT: / ;
		218	; ;
		219	;-----------------------------------------------------------------;
3545	hidnplayr	220	align 4
6011	hidnplayr	221	ipv4_input:
3545	hidnplayr	222
6908	ashmew2	223	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: packet from %u.%u.%u.%u ",\
3545	hidnplayr	224	[edx + IPv4_header.SourceAddress + 0]:1,[edx + IPv4_header.SourceAddress + 1]:1,\
		225	[edx + IPv4_header.SourceAddress + 2]:1,[edx + IPv4_header.SourceAddress + 3]:1
5522	hidnplayr	226	DEBUGF DEBUG_NETWORK_VERBOSE, "to %u.%u.%u.%u\n",\
3545	hidnplayr	227	[edx + IPv4_header.DestinationAddress + 0]:1,[edx + IPv4_header.DestinationAddress + 1]:1,\
		228	[edx + IPv4_header.DestinationAddress + 2]:1,[edx + IPv4_header.DestinationAddress + 3]:1
		229
6011	hidnplayr	230	call net_ptr_to_num4
5842	hidnplayr	231	cmp edi, -1
		232	je .invalid_device
		233
3545	hidnplayr	234	;-------------------------------
		235	; re-calculate the checksum
		236
6011	hidnplayr	237	ipv4_checksum edx
3545	hidnplayr	238	jnz .dump ; if checksum isn't valid then dump packet
		239
3556	hidnplayr	240	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Checksum ok\n"
3545	hidnplayr	241
5842	hidnplayr	242	;--------------------------------
		243	; Check if destination IP matches
3545	hidnplayr	244
5842	hidnplayr	245	; local ip (Using RFC1122 strong end system model)
3545	hidnplayr	246	mov eax, [edx + IPv4_header.DestinationAddress]
7678	hidnplayr	247	cmp eax, [IPv4_address + edi]
3545	hidnplayr	248	je .ip_ok
		249
5842	hidnplayr	250	; network layer broadcast
7678	hidnplayr	251	cmp eax, [IPv4_broadcast + edi]
3545	hidnplayr	252	je .ip_ok
		253
5842	hidnplayr	254	; physical layer broadcast (255.255.255.255)
3545	hidnplayr	255	cmp eax, 0xffffffff
		256	je .ip_ok
		257
5842	hidnplayr	258	; multicast (224.0.0.0/4 = 224.0.0.0 to 239.255.255.255)
3545	hidnplayr	259	and eax, 0x0fffffff
		260	cmp eax, 224
		261	je .ip_ok
		262
5842	hidnplayr	263	; maybe we just dont have an IP yet and should accept everything on the IP level
7678	hidnplayr	264	cmp [IPv4_address + edi], 0
3545	hidnplayr	265	je .ip_ok
		266
5842	hidnplayr	267	; or it's just not meant for us.. :(
3556	hidnplayr	268	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Destination address does not match!\n"
3545	hidnplayr	269	jmp .dump
		270
		271	;------------------------
		272	; Now we can update stats
		273
		274	.ip_ok:
4052	hidnplayr	275	inc [IPv4_packets_rx + edi]
3545	hidnplayr	276
		277	;----------------------------------
		278	; Check if the packet is fragmented
		279
		280	test [edx + IPv4_header.FlagsAndFragmentOffset], 1 shl 5 ; Is 'more fragments' flag set ?
		281	jnz .has_fragments ; If so, we definately have a fragmented packet
		282
		283	test [edx + IPv4_header.FlagsAndFragmentOffset], 0xff1f ; If flag is not set, but there is a fragment offset, the packet is last in series of fragmented packets
		284	jnz .is_last_fragment
		285
		286	;-------------------------------------------------------------------
		287	; No, it's just a regular IP packet, pass it to the higher protocols
		288
		289	.handle_it: ; We reach here if packet hasnt been fragmented, or when it already has been re-constructed
		290
		291	movzx esi, [edx + IPv4_header.VersionAndIHL] ; Calculate Header length by using IHL field
		292	and esi, 0x0000000f ;
		293	shl esi, 2 ;
		294
		295	movzx ecx, [edx + IPv4_header.TotalLength] ; Calculate length of encapsulated Packet
		296	xchg cl, ch ;
		297	sub ecx, esi ;
		298
		299	mov al, [edx + IPv4_header.Protocol]
		300	add esi, edx ; make esi ptr to data
		301
		302	cmp al, IP_PROTO_TCP
6011	hidnplayr	303	je tcp_input
3545	hidnplayr	304
		305	cmp al, IP_PROTO_UDP
6011	hidnplayr	306	je udp_input
3545	hidnplayr	307
		308	cmp al, IP_PROTO_ICMP
6011	hidnplayr	309	je icmp_input
3545	hidnplayr	310
5842	hidnplayr	311	;-------------------------------
		312	; Look for a matching RAW socket
		313	pusha
		314	mov ecx, socket_mutex
		315	call mutex_lock
		316	popa
		317
		318	add ecx, esi
		319	sub ecx, edx
		320	mov esi, edx
		321	movzx edx, al
		322	mov eax, net_sockets
		323	.next_socket:
		324	mov eax, [eax + SOCKET.NextPtr]
		325	or eax, eax
		326	jz .dump_unlock
		327
		328	cmp [eax + SOCKET.Domain], AF_INET4
		329	jne .next_socket
		330
		331	cmp [eax + SOCKET.Protocol], edx
		332	jne .next_socket
		333
		334	pusha
		335	mov ecx, socket_mutex
		336	call mutex_unlock
		337	popa
		338
		339	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: found matching RAW socket: 0x%x\n", eax
		340
		341	pusha
		342	lea ecx, [eax + SOCKET.mutex]
		343	call mutex_lock
		344	popa
		345
6011	hidnplayr	346	jmp socket_input
5842	hidnplayr	347
		348	.dump_unlock:
		349
		350	pusha
		351	mov ecx, socket_mutex
		352	call mutex_unlock
		353	popa
		354
3556	hidnplayr	355	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: unknown protocol %u\n", al
3545	hidnplayr	356
		357	.dump:
3556	hidnplayr	358	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: dumping\n"
5842	hidnplayr	359	inc [IPv4_packets_dumped + edi]
6011	hidnplayr	360	call net_buff_free
3545	hidnplayr	361	ret
		362
5842	hidnplayr	363	.invalid_device:
		364	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_input: packet originated from invalid device\n"
6011	hidnplayr	365	call net_buff_free
5842	hidnplayr	366	ret
3545	hidnplayr	367
5842	hidnplayr	368
3545	hidnplayr	369	;---------------------------
		370	; Fragmented packet handler
		371
		372
		373	.has_fragments:
		374	movzx eax, [edx + IPv4_header.FlagsAndFragmentOffset]
		375	xchg al, ah
		376	shl ax, 3
		377
4258	hidnplayr	378	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: fragmented packet offset=%u id=%x ptr=0x%x\n", ax, [edx + IPv4_header.Identification]:4, edx
3545	hidnplayr	379
		380	test ax, ax ; Is this the first packet of the fragment?
		381	jz .is_first_fragment
		382
		383
		384	;-------------------------------------------------------
		385	; We have a fragmented IP packet, but it's not the first
		386
3556	hidnplayr	387	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Middle fragment packet received!\n"
3545	hidnplayr	388
6011	hidnplayr	389	call ipv4_find_fragment_slot
3545	hidnplayr	390	cmp esi, -1
		391	je .dump
		392
4052	hidnplayr	393	mov [esi + IPv4_FRAGMENT_slot.ttl], 15 ; Reset the ttl
		394	mov esi, [esi + IPv4_FRAGMENT_slot.ptr]
3545	hidnplayr	395	or edi, -1
		396	.find_last_entry: ; The following routine will try to find the last entry
9799	Boppan	397	cmp edi, [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.PrevPtr]
3545	hidnplayr	398	jne .destroy_slot ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!)
		399	mov edi, esi
9799	Boppan	400	mov esi, [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr]
3545	hidnplayr	401	cmp esi, -1
		402	jne .find_last_entry
		403	; We found the last entry (pointer is now in edi)
		404	; We are going to overwrite the ethernet header in received packet with a FRAGMENT_entry structure
		405
		406	pop eax ; pointer to packet
9799	Boppan	407	mov [edi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr], eax ; update pointer of previous entry to the new entry
		408	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr], -1
		409	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.PrevPtr], edi
		410	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.Owner], ebx
3545	hidnplayr	411
		412	ret
		413
		414
		415	;------------------------------------
		416	; We have received the first fragment
		417
		418	.is_first_fragment:
3556	hidnplayr	419	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: First fragment packet received!\n"
3545	hidnplayr	420	; try to locate a free slot..
4052	hidnplayr	421	mov ecx, IPv4_MAX_FRAGMENTS
7678	hidnplayr	422	mov esi, IPv4_fragments
3545	hidnplayr	423	.find_free_slot:
4052	hidnplayr	424	cmp word [esi + IPv4_FRAGMENT_slot.ttl], 0
3545	hidnplayr	425	je .found_free_slot
4052	hidnplayr	426	add esi, sizeof.IPv4_FRAGMENT_slot
3545	hidnplayr	427	loop .find_free_slot
		428	jmp .dump ; If no free slot was found, dump the packet
		429
		430	.found_free_slot: ; We found a free slot, let's fill in the FRAGMENT_slot structure
4052	hidnplayr	431	mov [esi + IPv4_FRAGMENT_slot.ttl], 15 ; RFC recommends 15 secs as ttl
3545	hidnplayr	432	mov ax, [edx + IPv4_header.Identification]
4052	hidnplayr	433	mov [esi + IPv4_FRAGMENT_slot.id], ax
3545	hidnplayr	434	mov eax, [edx + IPv4_header.SourceAddress]
4052	hidnplayr	435	mov [esi + IPv4_FRAGMENT_slot.SrcIP], eax
3545	hidnplayr	436	mov eax, [edx + IPv4_header.DestinationAddress]
4052	hidnplayr	437	mov [esi + IPv4_FRAGMENT_slot.DstIP], eax
3545	hidnplayr	438	pop eax
4052	hidnplayr	439	mov [esi + IPv4_FRAGMENT_slot.ptr], eax
3545	hidnplayr	440	; Now, replace ethernet header in original buffer with a FRAGMENT_entry structure
9799	Boppan	441	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr], -1
		442	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.PrevPtr], -1
		443	mov [eax + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.Owner], ebx
3545	hidnplayr	444
		445	ret
		446
		447
		448	;-----------------------------------
		449	; We have received the last fragment
		450
		451	.is_last_fragment:
3556	hidnplayr	452	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Last fragment packet received!\n"
3545	hidnplayr	453
6011	hidnplayr	454	call ipv4_find_fragment_slot
3545	hidnplayr	455	cmp esi, -1
		456	je .dump
		457
4052	hidnplayr	458	mov esi, [esi + IPv4_FRAGMENT_slot.ptr] ; We found the first entry, let's calculate total size of the packet in eax, so we can allocate a buffer
3545	hidnplayr	459	push esi
		460	xor eax, eax
9801	Boppan	461	mov [edi_saved], edi
3545	hidnplayr	462	or edi, -1
		463
		464	.count_bytes:
9799	Boppan	465	cmp [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.PrevPtr], edi
4052	hidnplayr	466	jne .destroy_slot_pop ; Damn, something screwed up, remove the whole slot (and free buffers too if possible!)
9799	Boppan	467	mov cx, [esi + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.TotalLength] ; Add total length
3545	hidnplayr	468	xchg cl, ch
3556	hidnplayr	469	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Packet size=%u\n", cx
3545	hidnplayr	470	add ax, cx
9799	Boppan	471	movzx cx, [esi + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Sub Header length
3545	hidnplayr	472	and cx, 0x000F
		473	shl cx, 2
3556	hidnplayr	474	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Header size=%u\n", cx
3545	hidnplayr	475	sub ax, cx
		476	mov edi, esi
9799	Boppan	477	mov esi, [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr]
3545	hidnplayr	478	cmp esi, -1
		479	jne .count_bytes
		480
		481	mov esi, [esp+4]
9799	Boppan	482	mov [edi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr], esi ; Add this packet to the chain, this simplifies the following code
		483	mov [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr], -1
		484	mov [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.PrevPtr], edi
		485	mov [esi + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.Owner], ebx
3545	hidnplayr	486
4052	hidnplayr	487	mov cx, [edx + IPv4_header.TotalLength] ; Note: This time we dont substract Header length
3545	hidnplayr	488	xchg cl, ch
3556	hidnplayr	489	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Packet size=%u\n", cx
3545	hidnplayr	490	add ax, cx
3556	hidnplayr	491	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Total Received data size=%u\n", eax
3545	hidnplayr	492
		493	push eax
		494	mov ax, [edx + IPv4_header.FlagsAndFragmentOffset]
9736	Boppan	495	xchg al, ah
9729	Boppan	496	shl ax, 3
3545	hidnplayr	497	add cx, ax
		498	pop eax
3556	hidnplayr	499	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Total Fragment size=%u\n", ecx
3545	hidnplayr	500
		501	cmp ax, cx
		502	jne .destroy_slot_pop
		503
		504	push eax
		505	push eax
		506	call kernel_alloc
		507	test eax, eax
		508	je .destroy_slot_pop ; If we dont have enough space to allocate the buffer, discard all packets in slot
9805	Boppan	509	mov edx, [esp+4] ; Get pointer to first fragment entry back in edx
3545	hidnplayr	510
9807	Boppan	511	; FIXME: We should create NET_BUFF in eax instead of a rugular buffer with IP packet
		512
3545	hidnplayr	513	.rebuild_packet_loop:
9799	Boppan	514	movzx ecx, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.FlagsAndFragmentOffset] ; Calculate the fragment offset
3545	hidnplayr	515	xchg cl, ch ; intel byte order
		516	shl cx, 3 ; multiply by 8 and clear first 3 bits
3556	hidnplayr	517	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Fragment offset=%u\n", cx
3545	hidnplayr	518
		519	lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment
9799	Boppan	520	movzx ebx, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Find header size (in ebx) of fragment
3545	hidnplayr	521	and bx, 0x000F ;
		522	shl bx, 2 ;
		523
9799	Boppan	524	lea esi, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry] ; Set esi to the correct begin of fragment
		525	movzx ecx, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.TotalLength] ; Calculate total length of fragment
3545	hidnplayr	526	xchg cl, ch ; intel byte order
		527
		528	cmp edi, eax ; Is this packet the first fragment ?
		529	je .first_fragment
		530	sub cx, bx ; If not, dont copy the header
		531	add esi, ebx ;
9806	Boppan	532	add edi, ebx ; FIXME: We should add size of header of first fragment here
		533	; instead of size of currently copying fragment
		534	; because the fragment offset is offset within the big IP packet
		535	; data (not within the packet, within packet's contents)
3545	hidnplayr	536	.first_fragment:
		537
4258	hidnplayr	538
		539	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Copying %u bytes from 0x%x to 0x%x\n", ecx, esi, edi
3545	hidnplayr	540	push cx ; First copy dword-wise, then byte-wise
		541	shr cx, 2 ;
3711	clevermous	542	rep movsd ;
3545	hidnplayr	543	pop cx ;
		544	and cx, 3 ;
3711	clevermous	545	rep movsb ;
3545	hidnplayr	546
		547	push eax
9799	Boppan	548	push [edx + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet
		549	push [edx + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr] ; Set edx to the next pointer
3545	hidnplayr	550	push edx ; Push pointer to fragment onto stack
4258	hidnplayr	551	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Next Fragment: 0x%x\n", edx
6011	hidnplayr	552	call net_buff_free ; free the previous fragment buffer (this uses the value from stack)
4258	hidnplayr	553	pop edx ebx eax
3545	hidnplayr	554	cmp edx, -1 ; Check if it is last fragment in chain
		555	jne .rebuild_packet_loop
		556
		557	pop ecx
		558	xchg cl, ch
		559	mov edx, eax
		560	mov [edx + IPv4_header.TotalLength], cx
9807	Boppan	561	add esp, 8 ; Remove pointer to first buffer and pointer to last buffer from the stack
3545	hidnplayr	562	xchg cl, ch
9807	Boppan	563	push edx ; Push pointer to the new buffer with full IP packet
9801	Boppan	564	mov edi, [edi_saved]
9807	Boppan	565	jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, ebx=device ptr
3545	hidnplayr	566
		567	.destroy_slot_pop:
		568	add esp, 4
		569	.destroy_slot:
3556	hidnplayr	570	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Destroy fragment slot!\n"
3545	hidnplayr	571	; TODO!
		572	jmp .dump
		573
		574
		575
		576
		577
6011	hidnplayr	578	;-----------------------------------------------------------------;
		579	; ;
		580	; ipv4_find_fragment_slot ;
		581	; ;
		582	; IN: pointer to fragmented packet in edx ;
		583	; ;
		584	; OUT: pointer to slot in esi, -1 on error ;
		585	; ;
		586	;-----------------------------------------------------------------;
3545	hidnplayr	587	align 4
6011	hidnplayr	588	ipv4_find_fragment_slot:
3545	hidnplayr	589
		590	;;; TODO: the RFC says we should check protocol number too
		591
		592	push eax ebx ecx edx
		593	mov ax, [edx + IPv4_header.Identification]
4052	hidnplayr	594	mov ecx, IPv4_MAX_FRAGMENTS
7678	hidnplayr	595	mov esi, IPv4_fragments
3545	hidnplayr	596	mov ebx, [edx + IPv4_header.SourceAddress]
		597	mov edx, [edx + IPv4_header.DestinationAddress]
		598	.find_slot:
4052	hidnplayr	599	cmp [esi + IPv4_FRAGMENT_slot.id], ax
3545	hidnplayr	600	jne .try_next
4052	hidnplayr	601	cmp [esi + IPv4_FRAGMENT_slot.SrcIP], ebx
3545	hidnplayr	602	jne .try_next
4052	hidnplayr	603	cmp [esi + IPv4_FRAGMENT_slot.DstIP], edx
3545	hidnplayr	604	je .found_slot
		605	.try_next:
4052	hidnplayr	606	add esi, sizeof.IPv4_FRAGMENT_slot
3545	hidnplayr	607	loop .find_slot
		608
		609	or esi, -1
		610	.found_slot:
		611	pop edx ecx ebx eax
		612	ret
		613
		614
6011	hidnplayr	615	;------------------------------------------------------------------;
		616	; ;
		617	; ipv4_output ;
		618	; ;
		619	; IN: al = protocol ;
		620	; ah = TTL ;
		621	; ebx = device ptr (or 0 to let IP layer decide) ;
		622	; ecx = data length ;
		623	; edx = Source IP ;
		624	; edi = Destination IP ;
		625	; ;
		626	; OUT: eax = pointer to buffer start ;
		627	; eax = 0 on error ;
		628	; ebx = device ptr (send packet through this device) ;
		629	; ecx = data length ;
		630	; edx = size of complete frame ;
		631	; edi = start of IPv4 payload ;
		632	; ;
		633	;------------------------------------------------------------------;
3545	hidnplayr	634	align 4
6011	hidnplayr	635	ipv4_output:
3545	hidnplayr	636
6475	hidnplayr	637	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: size=%u ip=0x%x\n", ecx, edi
3545	hidnplayr	638
		639	cmp ecx, 65500 ; Max IPv4 packet size
		640	ja .too_large
		641
5842	hidnplayr	642	push ecx ax edi
		643	mov eax, edi
6011	hidnplayr	644	call ipv4_route ; outputs device number in edi, dest ip in eax, source IP in edx
6122	hidnplayr	645	test eax, eax
		646	jz .no_route
4052	hidnplayr	647	push edx
3610	hidnplayr	648	test edi, edi
		649	jz .loopback
		650
6011	hidnplayr	651	call arp_ip_to_mac
3545	hidnplayr	652	test eax, 0xffff0000 ; error bits
		653	jnz .arp_error
		654	push ebx ; push the mac onto the stack
		655	push ax
		656
5842	hidnplayr	657	inc [IPv4_packets_tx + edi] ; update stats
3545	hidnplayr	658
5015	hidnplayr	659	mov ax, ETHER_PROTO_IPv4
7679	hidnplayr	660	mov ebx, [net_device_list + edi]
4052	hidnplayr	661	mov ecx, [esp + 6 + 8 + 2]
3545	hidnplayr	662	add ecx, sizeof.IPv4_header
5015	hidnplayr	663	mov edx, esp
6011	hidnplayr	664	call eth_output
3545	hidnplayr	665	jz .eth_error
		666	add esp, 6 ; pop the mac out of the stack
		667
		668	.continue:
		669	xchg cl, ch ; internet byte order
		670	mov [edi + IPv4_header.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header)
		671	mov [edi + IPv4_header.TypeOfService], 0 ; nothing special, just plain ip packet
		672	mov [edi + IPv4_header.TotalLength], cx
		673	mov [edi + IPv4_header.Identification], 0 ; fragment id: FIXME
		674	mov [edi + IPv4_header.FlagsAndFragmentOffset], 0
4052	hidnplayr	675
3545	hidnplayr	676	mov [edi + IPv4_header.HeaderChecksum], 0
		677	popd [edi + IPv4_header.SourceAddress]
		678	popd [edi + IPv4_header.DestinationAddress]
		679
4052	hidnplayr	680	pop word[edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol
		681	; [edi + IPv4_header.Protocol]
		682
3545	hidnplayr	683	pop ecx
		684
6011	hidnplayr	685	ipv4_checksum edi
3545	hidnplayr	686	add edi, sizeof.IPv4_header
3556	hidnplayr	687	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: success!\n"
3545	hidnplayr	688	ret
		689
		690	.eth_error:
3603	hidnplayr	691	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ethernet error\n"
3545	hidnplayr	692	add esp, 3*4+2+6
5015	hidnplayr	693	xor eax, eax
3545	hidnplayr	694	ret
		695
6122	hidnplayr	696	.no_route:
		697	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: No route to host!\n"
		698	add esp, 2*4+2
		699	xor eax, eax
		700	ret
		701
3545	hidnplayr	702	.arp_error:
3603	hidnplayr	703	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ARP error=%x\n", eax
5842	hidnplayr	704	add esp, 4
		705	pop eax
		706	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ip=0x%x\n", eax
		707	add esp, 4+2
5015	hidnplayr	708	xor eax, eax
3545	hidnplayr	709	ret
		710
		711	.too_large:
3556	hidnplayr	712	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: Packet too large!\n"
5015	hidnplayr	713	xor eax, eax
3545	hidnplayr	714	ret
		715
		716	.loopback:
7678	hidnplayr	717	inc [IPv4_packets_tx + edi] ; update stats
		718
5522	hidnplayr	719	mov dword [esp], eax ; set source IP to dest IP
3610	hidnplayr	720	mov ecx, [esp + 10]
3545	hidnplayr	721	add ecx, sizeof.IPv4_header
3600	hidnplayr	722	mov edi, AF_INET4
6011	hidnplayr	723	call loop_output
3545	hidnplayr	724	jmp .continue
		725
		726
		727
		728
6011	hidnplayr	729	;------------------------------------------------------------------;
		730	; ;
		731	; ipv4_output_raw ;
		732	; ;
		733	; IN: eax = socket ptr ;
		734	; ecx = data length ;
		735	; esi = data ptr ;
		736	; ;
		737	; OUT: eax = -1 on error ;
		738	; ;
		739	;------------------------------------------------------------------;
3545	hidnplayr	740	align 4
6011	hidnplayr	741	ipv4_output_raw:
3545	hidnplayr	742
		743	DEBUGF 1,"IPv4_output_raw: size=%u ptr=%x socket=%x\n", ecx, esi, eax
		744
		745	sub esp, 8
		746	push esi eax
		747
6011	hidnplayr	748	call ipv4_route
		749	call arp_ip_to_mac
3545	hidnplayr	750
		751	test eax, 0xffff0000 ; error bits
		752	jnz .arp_error
		753
		754	push ebx ; push the mac
		755	push ax
		756
4052	hidnplayr	757	inc [IPv4_packets_tx + 4*edi]
5015	hidnplayr	758	mov ax, ETHER_PROTO_IPv4
7679	hidnplayr	759	mov ebx, [net_device_list + 4*edi]
3545	hidnplayr	760	mov ecx, [esp + 6 + 4]
		761	add ecx, sizeof.IPv4_header
5015	hidnplayr	762	mov edx, esp
6011	hidnplayr	763	call eth_output
3545	hidnplayr	764	jz .error
		765	add esp, 6 ; pop the mac
		766
		767	mov dword[esp+4+4], edx
		768	mov dword[esp+4+4+4], eax
		769
		770	pop eax esi
5842	hidnplayr	771	;; TODO: check socket options if we should add header, or just compute checksum
3545	hidnplayr	772
		773	push edi ecx
3711	clevermous	774	rep movsb
3545	hidnplayr	775	pop ecx edi
		776
		777	; [edi + IPv4_header.VersionAndIHL] ; IPv4, normal length (no Optional header)
		778	; [edi + IPv4_header.TypeOfService] ; nothing special, just plain ip packet
		779	; [edi + IPv4_header.TotalLength]
		780	; [edi + IPv4_header.TotalLength] ; internet byte order
		781	; [edi + IPv4_header.FlagsAndFragmentOffset]
		782
		783	mov [edi + IPv4_header.HeaderChecksum], 0
		784
		785	; [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol
		786	; [edi + IPv4_header.Protocol]
		787	; [edi + IPv4_header.Identification] ; fragment id
		788	; [edi + IPv4_header.SourceAddress]
		789	; [edi + IPv4_header.DestinationAddress]
		790
6011	hidnplayr	791	ipv4_checksum edi ;;;; todo: checksum for IP packet with options!
3545	hidnplayr	792	add edi, sizeof.IPv4_header
3556	hidnplayr	793	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output_raw: device=%x\n", ebx
3545	hidnplayr	794	call [ebx + NET_DEVICE.transmit]
		795	ret
		796
		797	.error:
5842	hidnplayr	798	add esp, 6+8+4+4
		799	mov ebx, ENOBUFS ; FIXME: NOBUFS or MSGSIZE error
		800	or eax, -1
		801	ret
		802
3545	hidnplayr	803	.arp_error:
		804	add esp, 8+4+4
5842	hidnplayr	805	mov ebx, ENOTCONN
5015	hidnplayr	806	or eax, -1
3545	hidnplayr	807	ret
		808
		809
6011	hidnplayr	810	;-----------------------------------------------------------------;
		811	; ;
		812	; ipv4_fragment ;
		813	; ;
		814	; IN: [esp] = ptr to packet buffer to fragment ;
		815	; edi = ptrr to ip header in that buffer ;
		816	; ebx = device ptr ;
		817	; ;
		818	; OUT: / ;
		819	; ;
		820	;-----------------------------------------------------------------;
		821	proc ipv4_fragment stdcall buffer
3545	hidnplayr	822
5842	hidnplayr	823	locals
		824	offset dd ?
		825	headerlength dd ?
		826	headerptr dd ?
		827	dataptr dd ?
		828	remaining dd ?
		829	segmentsize dd ?
		830	endl
3545	hidnplayr	831
3556	hidnplayr	832	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_fragment\n"
3545	hidnplayr	833
5842	hidnplayr	834	; We must be able to put at least 8 bytes per segment
		835	movzx eax, byte[edi] ; IHL
		836	and eax, 0xf
		837	shl eax, 2
		838	mov [headerlength], eax
		839	add eax, 8
		840	mov ecx, [ebx + NET_DEVICE.mtu]
		841	and ecx, not 11b
		842	cmp ecx, eax
		843	jb .fail
3545	hidnplayr	844
5842	hidnplayr	845	mov [edi + IPv4_header.HeaderChecksum], 0
3545	hidnplayr	846
5842	hidnplayr	847	mov [segmentsize], ecx
		848	mov [headerptr], edi
		849	movzx ecx, [edi + IPv4_header.TotalLength]
		850	xchg cl, ch
		851	sub ecx, [headerlength]
		852	mov [remaining], ecx
		853	mov [offset], 0
3545	hidnplayr	854
5842	hidnplayr	855	add edi, [headerlength]
		856	mov [dataptr], edi
3545	hidnplayr	857
5842	hidnplayr	858	.loop:
		859	DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: new fragment"
3545	hidnplayr	860
5842	hidnplayr	861	mov ecx, [segmentsize]
		862	cmp ecx, [remaining]
		863	jbe @f
		864	mov ecx, [remaining]
		865	@@:
3545	hidnplayr	866
5015	hidnplayr	867	mov ax, ETHER_PROTO_IPv4
5842	hidnplayr	868	mov edx, [esp]
		869	add edx, [edx + NET_BUFF.offset]
		870	; add edx, ETH_header.DstMAC ; = 0
3545	hidnplayr	871	call ETH_output
5842	hidnplayr	872	jz .fail
3545	hidnplayr	873
5842	hidnplayr	874	push edi
		875	mov edx, ecx
		876
3545	hidnplayr	877	; copy header
5842	hidnplayr	878	mov esi, [headerptr]
		879	mov ecx, [headerlength]
		880	shr ecx, 2
3711	clevermous	881	rep movsd
3545	hidnplayr	882
		883	; copy data
5842	hidnplayr	884	mov esi, [dataptr]
		885	add esi, [offset]
		886	mov ecx, edx
		887	sub ecx, [headerlength]
		888	shr ecx, 2
		889	rep movsd
		890	pop edi
3545	hidnplayr	891
		892	; now, correct header
5842	hidnplayr	893	; packet length
		894	mov ax, dx
		895	xchg al, ah
		896	mov [edi + IPv4_header.TotalLength], ax
3545	hidnplayr	897
5842	hidnplayr	898	; offset
		899	mov eax, [offset]
		900	xchg al, ah
3545	hidnplayr	901
5842	hidnplayr	902	sub edx, [headerlength]
		903	sub [remaining], edx
		904	je @f
		905	jb .fail
		906	or ah, 1 shl 2 ; more fragments
		907	add [offset], edx
		908	@@:
		909	mov [edi + IPv4_header.FlagsAndFragmentOffset], ax
3545	hidnplayr	910
5842	hidnplayr	911	; Send the fragment
3545	hidnplayr	912	IPv4_checksum edi
		913	call [ebx + NET_DEVICE.transmit]
		914
5842	hidnplayr	915	cmp [remaining], 0
		916	jne .loop
3545	hidnplayr	917
5842	hidnplayr	918	call NET_BUFF_free
		919	ret
3545	hidnplayr	920
5842	hidnplayr	921	.fail:
3556	hidnplayr	922	DEBUGF DEBUG_NETWORK_ERROR, "Ipv4_fragment: failed\n"
5522	hidnplayr	923	call NET_BUFF_free
3545	hidnplayr	924	ret
		925
5842	hidnplayr	926	endp
3545	hidnplayr	927
		928
5842	hidnplayr	929
6011	hidnplayr	930	;-----------------------------------------------------------------;
		931	; ;
		932	; ipv4_route ;
		933	; ;
		934	; IN: eax = Destination IP ;
		935	; ebx = outgoing device / 0 ;
		936	; edx = Source IP ;
		937	; ;
6122	hidnplayr	938	; OUT: eax = Destination IP (may be gateway), 0 on error ;
6011	hidnplayr	939	; edx = Source IP ;
		940	; edi = device number*4 ;
		941	; ;
		942	; DESTROYED: ;
		943	; ecx ;
		944	; ;
		945	;-----------------------------------------------------------------;
3545	hidnplayr	946	align 4
6122	hidnplayr	947	ipv4_route:
3545	hidnplayr	948
5584	hidnplayr	949	test ebx, ebx
		950	jnz .got_device
		951
6220	hidnplayr	952	; Broadcast does not need gateway
3545	hidnplayr	953	cmp eax, 0xffffffff
		954	je .broadcast
		955
		956	xor edi, edi
		957	.loop:
7678	hidnplayr	958	mov ebx, [IPv4_address + edi]
		959	and ebx, [IPv4_subnet + edi]
3545	hidnplayr	960	jz .next
4052	hidnplayr	961	mov ecx, eax
7678	hidnplayr	962	and ecx, [IPv4_subnet + edi]
4052	hidnplayr	963	cmp ebx, ecx
		964	je .got_it
3545	hidnplayr	965	.next:
		966	add edi, 4
4052	hidnplayr	967	cmp edi, 4*NET_DEVICES_MAX
		968	jb .loop
3545	hidnplayr	969
7678	hidnplayr	970	mov eax, [IPv4_gateway + 4] ; TODO: let user (or a user space daemon) configure default route
3545	hidnplayr	971	.broadcast:
4052	hidnplayr	972	mov edi, 4 ; TODO: same as above
		973	.got_it:
		974	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_route: %u\n", edi
		975	test edx, edx
		976	jnz @f
7678	hidnplayr	977	mov edx, [IPv4_address + edi]
4052	hidnplayr	978	@@:
		979
3545	hidnplayr	980	ret
		981
5584	hidnplayr	982	.got_device:
		983	; Validate device ptr and convert to device number
6011	hidnplayr	984	call net_ptr_to_num4
5584	hidnplayr	985	cmp edi, -1
		986	je .fail
3545	hidnplayr	987
7678	hidnplayr	988	mov edx, [IPv4_address + edi] ; Source IP
3545	hidnplayr	989
6220	hidnplayr	990	; Broadcast does not need gateway
		991	cmp eax, 0xffffffff
		992	je @f
		993
5584	hidnplayr	994	; Check if we should route to gateway or not
7678	hidnplayr	995	mov ebx, [IPv4_address + edi]
		996	and ebx, [IPv4_subnet + edi]
5584	hidnplayr	997	mov ecx, eax
7678	hidnplayr	998	and ecx, [IPv4_subnet + edi]
6475	hidnplayr	999	cmp ecx, ebx
5584	hidnplayr	1000	je @f
7678	hidnplayr	1001	mov eax, [IPv4_gateway + edi]
5584	hidnplayr	1002	@@:
6475	hidnplayr	1003	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_route: %u\n", edi
5584	hidnplayr	1004	ret
		1005
		1006	.fail:
6475	hidnplayr	1007	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_route failed\n"
6122	hidnplayr	1008	xor eax, eax
5584	hidnplayr	1009	ret
		1010
		1011
		1012
6011	hidnplayr	1013	;-----------------------------------------------------------------;
		1014	; ;
		1015	; ipv4_get_frgmnt_num ;
		1016	; ;
		1017	; IN: / ;
		1018	; ;
		1019	; OUT: ax = fragment number ;
		1020	; ;
		1021	;-----------------------------------------------------------------;
3545	hidnplayr	1022	align 4
6011	hidnplayr	1023	ipv4_get_frgmnt_num:
3545	hidnplayr	1024	xor ax, ax ;;; TODO: replace this with real code
		1025
		1026	ret
		1027
		1028
6011	hidnplayr	1029	;-----------------------------------------------------------------;
		1030	; ;
		1031	; ipv4_connect ;
		1032	; ;
		1033	; IN: eax = socket pointer ;
		1034	; ;
		1035	; OUT: eax = 0 on success ;
		1036	; eax = -1 on error ;
		1037	; ebx = error code on error ;
		1038	; ;
		1039	;-----------------------------------------------------------------;
4030	hidnplayr	1040	align 4
6011	hidnplayr	1041	ipv4_connect:
4030	hidnplayr	1042
4035	hidnplayr	1043	push eax edx
4030	hidnplayr	1044	lea ecx, [eax + SOCKET.mutex]
		1045	call mutex_lock
4035	hidnplayr	1046	pop edx eax
4030	hidnplayr	1047
		1048	; Fill in local IP
		1049	cmp [eax + IP_SOCKET.LocalIP], 0
		1050	jne @f
7678	hidnplayr	1051	push [IPv4_address + 4] ; FIXME: use correct local IP
4030	hidnplayr	1052	pop [eax + IP_SOCKET.LocalIP]
		1053
		1054	; Fill in remote IP
		1055	pushd [edx + 4]
		1056	pop [eax + IP_SOCKET.RemoteIP]
		1057
		1058	lea ecx, [eax + SOCKET.mutex]
		1059	call mutex_unlock
		1060
		1061	xor eax, eax
		1062	ret
		1063
		1064
6011	hidnplayr	1065	;-----------------------------------------------------------------;
		1066	; ;
		1067	; ipv4_API: Part of system function 76. ;
		1068	; ;
		1069	; IN: bl = subfunction number ;
		1070	; bh = device number ;
		1071	; ecx, edx, .. depends on subfunction ;
		1072	; ;
		1073	; OUT: depends on subfunction ;
		1074	; ;
		1075	;-----------------------------------------------------------------;
3545	hidnplayr	1076	align 4
6011	hidnplayr	1077	ipv4_api:
3545	hidnplayr	1078
		1079	movzx eax, bh
		1080	shl eax, 2
		1081
		1082	and ebx, 0x000000ff
		1083	cmp ebx, .number
		1084	ja .error
		1085	jmp dword [.table + 4*ebx]
		1086
		1087	.table:
		1088	dd .packets_tx ; 0
		1089	dd .packets_rx ; 1
		1090	dd .read_ip ; 2
		1091	dd .write_ip ; 3
		1092	dd .read_dns ; 4
		1093	dd .write_dns ; 5
		1094	dd .read_subnet ; 6
		1095	dd .write_subnet ; 7
		1096	dd .read_gateway ; 8
		1097	dd .write_gateway ; 9
		1098	.number = ($ - .table) / 4 - 1
		1099
		1100	.error:
		1101	mov eax, -1
		1102	ret
		1103
		1104	.packets_tx:
4052	hidnplayr	1105	mov eax, [IPv4_packets_tx + eax]
3545	hidnplayr	1106	ret
		1107
		1108	.packets_rx:
4052	hidnplayr	1109	mov eax, [IPv4_packets_rx + eax]
3545	hidnplayr	1110	ret
		1111
		1112	.read_ip:
7678	hidnplayr	1113	mov eax, [IPv4_address + eax]
3545	hidnplayr	1114	ret
		1115
		1116	.write_ip:
7678	hidnplayr	1117	mov [IPv4_address + eax], ecx
3545	hidnplayr	1118	mov edi, eax ; device number, we'll need it for ARP
		1119
		1120	; pre-calculate the local broadcast address
7678	hidnplayr	1121	mov ebx, [IPv4_subnet + eax]
3545	hidnplayr	1122	not ebx
		1123	or ebx, ecx
7678	hidnplayr	1124	mov [IPv4_broadcast + eax], ebx
3545	hidnplayr	1125
7679	hidnplayr	1126	mov ebx, [net_device_list + eax]
7678	hidnplayr	1127	mov eax, [IPv4_address + eax]
6011	hidnplayr	1128	call arp_output_request ; now send a gratuitous ARP
3545	hidnplayr	1129
6011	hidnplayr	1130	call net_send_event
3545	hidnplayr	1131	xor eax, eax
		1132	ret
		1133
		1134	.read_dns:
7678	hidnplayr	1135	mov eax, [IPv4_nameserver + eax]
3545	hidnplayr	1136	ret
		1137
		1138	.write_dns:
7678	hidnplayr	1139	mov [IPv4_nameserver + eax], ecx
6011	hidnplayr	1140	call net_send_event
3545	hidnplayr	1141	xor eax, eax
		1142	ret
		1143
		1144	.read_subnet:
7678	hidnplayr	1145	mov eax, [IPv4_subnet + eax]
3545	hidnplayr	1146	ret
		1147
		1148	.write_subnet:
7678	hidnplayr	1149	mov [IPv4_subnet + eax], ecx
3545	hidnplayr	1150
		1151	; pre-calculate the local broadcast address
7678	hidnplayr	1152	mov ebx, [IPv4_address + eax]
3545	hidnplayr	1153	not ecx
		1154	or ecx, ebx
7678	hidnplayr	1155	mov [IPv4_broadcast + eax], ecx
3545	hidnplayr	1156
6011	hidnplayr	1157	call net_send_event
3545	hidnplayr	1158	xor eax, eax
		1159	ret
		1160
		1161	.read_gateway:
7678	hidnplayr	1162	mov eax, [IPv4_gateway + eax]
3545	hidnplayr	1163	ret
		1164
		1165	.write_gateway:
7678	hidnplayr	1166	mov [IPv4_gateway + eax], ecx
3545	hidnplayr	1167
6011	hidnplayr	1168	call net_send_event
3545	hidnplayr	1169	xor eax, eax
9799	Boppan	1170	ret

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(root)/kernel/trunk/network/IPv4.inc @ 7098 – Rev 9807