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: 9806 $
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
		511	.rebuild_packet_loop:
9799	Boppan	512	movzx ecx, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.FlagsAndFragmentOffset] ; Calculate the fragment offset
3545	hidnplayr	513	xchg cl, ch ; intel byte order
		514	shl cx, 3 ; multiply by 8 and clear first 3 bits
3556	hidnplayr	515	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Fragment offset=%u\n", cx
3545	hidnplayr	516
		517	lea edi, [eax + ecx] ; Notice that edi will be equal to eax for first fragment
9799	Boppan	518	movzx ebx, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.VersionAndIHL] ; Find header size (in ebx) of fragment
3545	hidnplayr	519	and bx, 0x000F ;
		520	shl bx, 2 ;
		521
9799	Boppan	522	lea esi, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry] ; Set esi to the correct begin of fragment
		523	movzx ecx, [edx + sizeof.NET_BUFF + sizeof.IPv4_FRAGMENT_entry + IPv4_header.TotalLength] ; Calculate total length of fragment
3545	hidnplayr	524	xchg cl, ch ; intel byte order
		525
		526	cmp edi, eax ; Is this packet the first fragment ?
		527	je .first_fragment
		528	sub cx, bx ; If not, dont copy the header
		529	add esi, ebx ;
9806	Boppan	530	add edi, ebx ; FIXME: We should add size of header of first fragment here
		531	; instead of size of currently copying fragment
		532	; because the fragment offset is offset within the big IP packet
		533	; data (not within the packet, within packet's contents)
3545	hidnplayr	534	.first_fragment:
		535
4258	hidnplayr	536
		537	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Copying %u bytes from 0x%x to 0x%x\n", ecx, esi, edi
3545	hidnplayr	538	push cx ; First copy dword-wise, then byte-wise
		539	shr cx, 2 ;
3711	clevermous	540	rep movsd ;
3545	hidnplayr	541	pop cx ;
		542	and cx, 3 ;
3711	clevermous	543	rep movsb ;
3545	hidnplayr	544
		545	push eax
9799	Boppan	546	push [edx + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.Owner] ; we need to remeber the owner, in case this is the last packet
		547	push [edx + sizeof.NET_BUFF + IPv4_FRAGMENT_entry.NextPtr] ; Set edx to the next pointer
3545	hidnplayr	548	push edx ; Push pointer to fragment onto stack
4258	hidnplayr	549	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Next Fragment: 0x%x\n", edx
6011	hidnplayr	550	call net_buff_free ; free the previous fragment buffer (this uses the value from stack)
4258	hidnplayr	551	pop edx ebx eax
3545	hidnplayr	552	cmp edx, -1 ; Check if it is last fragment in chain
		553	jne .rebuild_packet_loop
		554
		555	pop ecx
		556	xchg cl, ch
		557	mov edx, eax
		558	mov [edx + IPv4_header.TotalLength], cx
4259	hidnplayr	559	add esp, 12
3545	hidnplayr	560	xchg cl, ch
4259	hidnplayr	561	push ecx edx ; size and pointer
9801	Boppan	562	mov edi, [edi_saved]
4259	hidnplayr	563	jmp .handle_it ; edx = buf ptr, ecx = size, [esp] buf ptr, [esp+4], total size, ebx=device ptr
3545	hidnplayr	564
		565	.destroy_slot_pop:
		566	add esp, 4
		567	.destroy_slot:
3556	hidnplayr	568	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_input: Destroy fragment slot!\n"
3545	hidnplayr	569	; TODO!
		570	jmp .dump
		571
		572
		573
		574
		575
6011	hidnplayr	576	;-----------------------------------------------------------------;
		577	; ;
		578	; ipv4_find_fragment_slot ;
		579	; ;
		580	; IN: pointer to fragmented packet in edx ;
		581	; ;
		582	; OUT: pointer to slot in esi, -1 on error ;
		583	; ;
		584	;-----------------------------------------------------------------;
3545	hidnplayr	585	align 4
6011	hidnplayr	586	ipv4_find_fragment_slot:
3545	hidnplayr	587
		588	;;; TODO: the RFC says we should check protocol number too
		589
		590	push eax ebx ecx edx
		591	mov ax, [edx + IPv4_header.Identification]
4052	hidnplayr	592	mov ecx, IPv4_MAX_FRAGMENTS
7678	hidnplayr	593	mov esi, IPv4_fragments
3545	hidnplayr	594	mov ebx, [edx + IPv4_header.SourceAddress]
		595	mov edx, [edx + IPv4_header.DestinationAddress]
		596	.find_slot:
4052	hidnplayr	597	cmp [esi + IPv4_FRAGMENT_slot.id], ax
3545	hidnplayr	598	jne .try_next
4052	hidnplayr	599	cmp [esi + IPv4_FRAGMENT_slot.SrcIP], ebx
3545	hidnplayr	600	jne .try_next
4052	hidnplayr	601	cmp [esi + IPv4_FRAGMENT_slot.DstIP], edx
3545	hidnplayr	602	je .found_slot
		603	.try_next:
4052	hidnplayr	604	add esi, sizeof.IPv4_FRAGMENT_slot
3545	hidnplayr	605	loop .find_slot
		606
		607	or esi, -1
		608	.found_slot:
		609	pop edx ecx ebx eax
		610	ret
		611
		612
6011	hidnplayr	613	;------------------------------------------------------------------;
		614	; ;
		615	; ipv4_output ;
		616	; ;
		617	; IN: al = protocol ;
		618	; ah = TTL ;
		619	; ebx = device ptr (or 0 to let IP layer decide) ;
		620	; ecx = data length ;
		621	; edx = Source IP ;
		622	; edi = Destination IP ;
		623	; ;
		624	; OUT: eax = pointer to buffer start ;
		625	; eax = 0 on error ;
		626	; ebx = device ptr (send packet through this device) ;
		627	; ecx = data length ;
		628	; edx = size of complete frame ;
		629	; edi = start of IPv4 payload ;
		630	; ;
		631	;------------------------------------------------------------------;
3545	hidnplayr	632	align 4
6011	hidnplayr	633	ipv4_output:
3545	hidnplayr	634
6475	hidnplayr	635	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: size=%u ip=0x%x\n", ecx, edi
3545	hidnplayr	636
		637	cmp ecx, 65500 ; Max IPv4 packet size
		638	ja .too_large
		639
5842	hidnplayr	640	push ecx ax edi
		641	mov eax, edi
6011	hidnplayr	642	call ipv4_route ; outputs device number in edi, dest ip in eax, source IP in edx
6122	hidnplayr	643	test eax, eax
		644	jz .no_route
4052	hidnplayr	645	push edx
3610	hidnplayr	646	test edi, edi
		647	jz .loopback
		648
6011	hidnplayr	649	call arp_ip_to_mac
3545	hidnplayr	650	test eax, 0xffff0000 ; error bits
		651	jnz .arp_error
		652	push ebx ; push the mac onto the stack
		653	push ax
		654
5842	hidnplayr	655	inc [IPv4_packets_tx + edi] ; update stats
3545	hidnplayr	656
5015	hidnplayr	657	mov ax, ETHER_PROTO_IPv4
7679	hidnplayr	658	mov ebx, [net_device_list + edi]
4052	hidnplayr	659	mov ecx, [esp + 6 + 8 + 2]
3545	hidnplayr	660	add ecx, sizeof.IPv4_header
5015	hidnplayr	661	mov edx, esp
6011	hidnplayr	662	call eth_output
3545	hidnplayr	663	jz .eth_error
		664	add esp, 6 ; pop the mac out of the stack
		665
		666	.continue:
		667	xchg cl, ch ; internet byte order
		668	mov [edi + IPv4_header.VersionAndIHL], 0x45 ; IPv4, normal length (no Optional header)
		669	mov [edi + IPv4_header.TypeOfService], 0 ; nothing special, just plain ip packet
		670	mov [edi + IPv4_header.TotalLength], cx
		671	mov [edi + IPv4_header.Identification], 0 ; fragment id: FIXME
		672	mov [edi + IPv4_header.FlagsAndFragmentOffset], 0
4052	hidnplayr	673
3545	hidnplayr	674	mov [edi + IPv4_header.HeaderChecksum], 0
		675	popd [edi + IPv4_header.SourceAddress]
		676	popd [edi + IPv4_header.DestinationAddress]
		677
4052	hidnplayr	678	pop word[edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol
		679	; [edi + IPv4_header.Protocol]
		680
3545	hidnplayr	681	pop ecx
		682
6011	hidnplayr	683	ipv4_checksum edi
3545	hidnplayr	684	add edi, sizeof.IPv4_header
3556	hidnplayr	685	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output: success!\n"
3545	hidnplayr	686	ret
		687
		688	.eth_error:
3603	hidnplayr	689	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ethernet error\n"
3545	hidnplayr	690	add esp, 3*4+2+6
5015	hidnplayr	691	xor eax, eax
3545	hidnplayr	692	ret
		693
6122	hidnplayr	694	.no_route:
		695	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: No route to host!\n"
		696	add esp, 2*4+2
		697	xor eax, eax
		698	ret
		699
3545	hidnplayr	700	.arp_error:
3603	hidnplayr	701	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ARP error=%x\n", eax
5842	hidnplayr	702	add esp, 4
		703	pop eax
		704	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: ip=0x%x\n", eax
		705	add esp, 4+2
5015	hidnplayr	706	xor eax, eax
3545	hidnplayr	707	ret
		708
		709	.too_large:
3556	hidnplayr	710	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_output: Packet too large!\n"
5015	hidnplayr	711	xor eax, eax
3545	hidnplayr	712	ret
		713
		714	.loopback:
7678	hidnplayr	715	inc [IPv4_packets_tx + edi] ; update stats
		716
5522	hidnplayr	717	mov dword [esp], eax ; set source IP to dest IP
3610	hidnplayr	718	mov ecx, [esp + 10]
3545	hidnplayr	719	add ecx, sizeof.IPv4_header
3600	hidnplayr	720	mov edi, AF_INET4
6011	hidnplayr	721	call loop_output
3545	hidnplayr	722	jmp .continue
		723
		724
		725
		726
6011	hidnplayr	727	;------------------------------------------------------------------;
		728	; ;
		729	; ipv4_output_raw ;
		730	; ;
		731	; IN: eax = socket ptr ;
		732	; ecx = data length ;
		733	; esi = data ptr ;
		734	; ;
		735	; OUT: eax = -1 on error ;
		736	; ;
		737	;------------------------------------------------------------------;
3545	hidnplayr	738	align 4
6011	hidnplayr	739	ipv4_output_raw:
3545	hidnplayr	740
		741	DEBUGF 1,"IPv4_output_raw: size=%u ptr=%x socket=%x\n", ecx, esi, eax
		742
		743	sub esp, 8
		744	push esi eax
		745
6011	hidnplayr	746	call ipv4_route
		747	call arp_ip_to_mac
3545	hidnplayr	748
		749	test eax, 0xffff0000 ; error bits
		750	jnz .arp_error
		751
		752	push ebx ; push the mac
		753	push ax
		754
4052	hidnplayr	755	inc [IPv4_packets_tx + 4*edi]
5015	hidnplayr	756	mov ax, ETHER_PROTO_IPv4
7679	hidnplayr	757	mov ebx, [net_device_list + 4*edi]
3545	hidnplayr	758	mov ecx, [esp + 6 + 4]
		759	add ecx, sizeof.IPv4_header
5015	hidnplayr	760	mov edx, esp
6011	hidnplayr	761	call eth_output
3545	hidnplayr	762	jz .error
		763	add esp, 6 ; pop the mac
		764
		765	mov dword[esp+4+4], edx
		766	mov dword[esp+4+4+4], eax
		767
		768	pop eax esi
5842	hidnplayr	769	;; TODO: check socket options if we should add header, or just compute checksum
3545	hidnplayr	770
		771	push edi ecx
3711	clevermous	772	rep movsb
3545	hidnplayr	773	pop ecx edi
		774
		775	; [edi + IPv4_header.VersionAndIHL] ; IPv4, normal length (no Optional header)
		776	; [edi + IPv4_header.TypeOfService] ; nothing special, just plain ip packet
		777	; [edi + IPv4_header.TotalLength]
		778	; [edi + IPv4_header.TotalLength] ; internet byte order
		779	; [edi + IPv4_header.FlagsAndFragmentOffset]
		780
		781	mov [edi + IPv4_header.HeaderChecksum], 0
		782
		783	; [edi + IPv4_header.TimeToLive] ; ttl shl 8 + protocol
		784	; [edi + IPv4_header.Protocol]
		785	; [edi + IPv4_header.Identification] ; fragment id
		786	; [edi + IPv4_header.SourceAddress]
		787	; [edi + IPv4_header.DestinationAddress]
		788
6011	hidnplayr	789	ipv4_checksum edi ;;;; todo: checksum for IP packet with options!
3545	hidnplayr	790	add edi, sizeof.IPv4_header
3556	hidnplayr	791	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_output_raw: device=%x\n", ebx
3545	hidnplayr	792	call [ebx + NET_DEVICE.transmit]
		793	ret
		794
		795	.error:
5842	hidnplayr	796	add esp, 6+8+4+4
		797	mov ebx, ENOBUFS ; FIXME: NOBUFS or MSGSIZE error
		798	or eax, -1
		799	ret
		800
3545	hidnplayr	801	.arp_error:
		802	add esp, 8+4+4
5842	hidnplayr	803	mov ebx, ENOTCONN
5015	hidnplayr	804	or eax, -1
3545	hidnplayr	805	ret
		806
		807
6011	hidnplayr	808	;-----------------------------------------------------------------;
		809	; ;
		810	; ipv4_fragment ;
		811	; ;
		812	; IN: [esp] = ptr to packet buffer to fragment ;
		813	; edi = ptrr to ip header in that buffer ;
		814	; ebx = device ptr ;
		815	; ;
		816	; OUT: / ;
		817	; ;
		818	;-----------------------------------------------------------------;
		819	proc ipv4_fragment stdcall buffer
3545	hidnplayr	820
5842	hidnplayr	821	locals
		822	offset dd ?
		823	headerlength dd ?
		824	headerptr dd ?
		825	dataptr dd ?
		826	remaining dd ?
		827	segmentsize dd ?
		828	endl
3545	hidnplayr	829
3556	hidnplayr	830	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_fragment\n"
3545	hidnplayr	831
5842	hidnplayr	832	; We must be able to put at least 8 bytes per segment
		833	movzx eax, byte[edi] ; IHL
		834	and eax, 0xf
		835	shl eax, 2
		836	mov [headerlength], eax
		837	add eax, 8
		838	mov ecx, [ebx + NET_DEVICE.mtu]
		839	and ecx, not 11b
		840	cmp ecx, eax
		841	jb .fail
3545	hidnplayr	842
5842	hidnplayr	843	mov [edi + IPv4_header.HeaderChecksum], 0
3545	hidnplayr	844
5842	hidnplayr	845	mov [segmentsize], ecx
		846	mov [headerptr], edi
		847	movzx ecx, [edi + IPv4_header.TotalLength]
		848	xchg cl, ch
		849	sub ecx, [headerlength]
		850	mov [remaining], ecx
		851	mov [offset], 0
3545	hidnplayr	852
5842	hidnplayr	853	add edi, [headerlength]
		854	mov [dataptr], edi
3545	hidnplayr	855
5842	hidnplayr	856	.loop:
		857	DEBUGF DEBUG_NETWORK_VERBOSE, "Ipv4_fragment: new fragment"
3545	hidnplayr	858
5842	hidnplayr	859	mov ecx, [segmentsize]
		860	cmp ecx, [remaining]
		861	jbe @f
		862	mov ecx, [remaining]
		863	@@:
3545	hidnplayr	864
5015	hidnplayr	865	mov ax, ETHER_PROTO_IPv4
5842	hidnplayr	866	mov edx, [esp]
		867	add edx, [edx + NET_BUFF.offset]
		868	; add edx, ETH_header.DstMAC ; = 0
3545	hidnplayr	869	call ETH_output
5842	hidnplayr	870	jz .fail
3545	hidnplayr	871
5842	hidnplayr	872	push edi
		873	mov edx, ecx
		874
3545	hidnplayr	875	; copy header
5842	hidnplayr	876	mov esi, [headerptr]
		877	mov ecx, [headerlength]
		878	shr ecx, 2
3711	clevermous	879	rep movsd
3545	hidnplayr	880
		881	; copy data
5842	hidnplayr	882	mov esi, [dataptr]
		883	add esi, [offset]
		884	mov ecx, edx
		885	sub ecx, [headerlength]
		886	shr ecx, 2
		887	rep movsd
		888	pop edi
3545	hidnplayr	889
		890	; now, correct header
5842	hidnplayr	891	; packet length
		892	mov ax, dx
		893	xchg al, ah
		894	mov [edi + IPv4_header.TotalLength], ax
3545	hidnplayr	895
5842	hidnplayr	896	; offset
		897	mov eax, [offset]
		898	xchg al, ah
3545	hidnplayr	899
5842	hidnplayr	900	sub edx, [headerlength]
		901	sub [remaining], edx
		902	je @f
		903	jb .fail
		904	or ah, 1 shl 2 ; more fragments
		905	add [offset], edx
		906	@@:
		907	mov [edi + IPv4_header.FlagsAndFragmentOffset], ax
3545	hidnplayr	908
5842	hidnplayr	909	; Send the fragment
3545	hidnplayr	910	IPv4_checksum edi
		911	call [ebx + NET_DEVICE.transmit]
		912
5842	hidnplayr	913	cmp [remaining], 0
		914	jne .loop
3545	hidnplayr	915
5842	hidnplayr	916	call NET_BUFF_free
		917	ret
3545	hidnplayr	918
5842	hidnplayr	919	.fail:
3556	hidnplayr	920	DEBUGF DEBUG_NETWORK_ERROR, "Ipv4_fragment: failed\n"
5522	hidnplayr	921	call NET_BUFF_free
3545	hidnplayr	922	ret
		923
5842	hidnplayr	924	endp
3545	hidnplayr	925
		926
5842	hidnplayr	927
6011	hidnplayr	928	;-----------------------------------------------------------------;
		929	; ;
		930	; ipv4_route ;
		931	; ;
		932	; IN: eax = Destination IP ;
		933	; ebx = outgoing device / 0 ;
		934	; edx = Source IP ;
		935	; ;
6122	hidnplayr	936	; OUT: eax = Destination IP (may be gateway), 0 on error ;
6011	hidnplayr	937	; edx = Source IP ;
		938	; edi = device number*4 ;
		939	; ;
		940	; DESTROYED: ;
		941	; ecx ;
		942	; ;
		943	;-----------------------------------------------------------------;
3545	hidnplayr	944	align 4
6122	hidnplayr	945	ipv4_route:
3545	hidnplayr	946
5584	hidnplayr	947	test ebx, ebx
		948	jnz .got_device
		949
6220	hidnplayr	950	; Broadcast does not need gateway
3545	hidnplayr	951	cmp eax, 0xffffffff
		952	je .broadcast
		953
		954	xor edi, edi
		955	.loop:
7678	hidnplayr	956	mov ebx, [IPv4_address + edi]
		957	and ebx, [IPv4_subnet + edi]
3545	hidnplayr	958	jz .next
4052	hidnplayr	959	mov ecx, eax
7678	hidnplayr	960	and ecx, [IPv4_subnet + edi]
4052	hidnplayr	961	cmp ebx, ecx
		962	je .got_it
3545	hidnplayr	963	.next:
		964	add edi, 4
4052	hidnplayr	965	cmp edi, 4*NET_DEVICES_MAX
		966	jb .loop
3545	hidnplayr	967
7678	hidnplayr	968	mov eax, [IPv4_gateway + 4] ; TODO: let user (or a user space daemon) configure default route
3545	hidnplayr	969	.broadcast:
4052	hidnplayr	970	mov edi, 4 ; TODO: same as above
		971	.got_it:
		972	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_route: %u\n", edi
		973	test edx, edx
		974	jnz @f
7678	hidnplayr	975	mov edx, [IPv4_address + edi]
4052	hidnplayr	976	@@:
		977
3545	hidnplayr	978	ret
		979
5584	hidnplayr	980	.got_device:
		981	; Validate device ptr and convert to device number
6011	hidnplayr	982	call net_ptr_to_num4
5584	hidnplayr	983	cmp edi, -1
		984	je .fail
3545	hidnplayr	985
7678	hidnplayr	986	mov edx, [IPv4_address + edi] ; Source IP
3545	hidnplayr	987
6220	hidnplayr	988	; Broadcast does not need gateway
		989	cmp eax, 0xffffffff
		990	je @f
		991
5584	hidnplayr	992	; Check if we should route to gateway or not
7678	hidnplayr	993	mov ebx, [IPv4_address + edi]
		994	and ebx, [IPv4_subnet + edi]
5584	hidnplayr	995	mov ecx, eax
7678	hidnplayr	996	and ecx, [IPv4_subnet + edi]
6475	hidnplayr	997	cmp ecx, ebx
5584	hidnplayr	998	je @f
7678	hidnplayr	999	mov eax, [IPv4_gateway + edi]
5584	hidnplayr	1000	@@:
6475	hidnplayr	1001	DEBUGF DEBUG_NETWORK_VERBOSE, "IPv4_route: %u\n", edi
5584	hidnplayr	1002	ret
		1003
		1004	.fail:
6475	hidnplayr	1005	DEBUGF DEBUG_NETWORK_ERROR, "IPv4_route failed\n"
6122	hidnplayr	1006	xor eax, eax
5584	hidnplayr	1007	ret
		1008
		1009
		1010
6011	hidnplayr	1011	;-----------------------------------------------------------------;
		1012	; ;
		1013	; ipv4_get_frgmnt_num ;
		1014	; ;
		1015	; IN: / ;
		1016	; ;
		1017	; OUT: ax = fragment number ;
		1018	; ;
		1019	;-----------------------------------------------------------------;
3545	hidnplayr	1020	align 4
6011	hidnplayr	1021	ipv4_get_frgmnt_num:
3545	hidnplayr	1022	xor ax, ax ;;; TODO: replace this with real code
		1023
		1024	ret
		1025
		1026
6011	hidnplayr	1027	;-----------------------------------------------------------------;
		1028	; ;
		1029	; ipv4_connect ;
		1030	; ;
		1031	; IN: eax = socket pointer ;
		1032	; ;
		1033	; OUT: eax = 0 on success ;
		1034	; eax = -1 on error ;
		1035	; ebx = error code on error ;
		1036	; ;
		1037	;-----------------------------------------------------------------;
4030	hidnplayr	1038	align 4
6011	hidnplayr	1039	ipv4_connect:
4030	hidnplayr	1040
4035	hidnplayr	1041	push eax edx
4030	hidnplayr	1042	lea ecx, [eax + SOCKET.mutex]
		1043	call mutex_lock
4035	hidnplayr	1044	pop edx eax
4030	hidnplayr	1045
		1046	; Fill in local IP
		1047	cmp [eax + IP_SOCKET.LocalIP], 0
		1048	jne @f
7678	hidnplayr	1049	push [IPv4_address + 4] ; FIXME: use correct local IP
4030	hidnplayr	1050	pop [eax + IP_SOCKET.LocalIP]
		1051
		1052	; Fill in remote IP
		1053	pushd [edx + 4]
		1054	pop [eax + IP_SOCKET.RemoteIP]
		1055
		1056	lea ecx, [eax + SOCKET.mutex]
		1057	call mutex_unlock
		1058
		1059	xor eax, eax
		1060	ret
		1061
		1062
6011	hidnplayr	1063	;-----------------------------------------------------------------;
		1064	; ;
		1065	; ipv4_API: Part of system function 76. ;
		1066	; ;
		1067	; IN: bl = subfunction number ;
		1068	; bh = device number ;
		1069	; ecx, edx, .. depends on subfunction ;
		1070	; ;
		1071	; OUT: depends on subfunction ;
		1072	; ;
		1073	;-----------------------------------------------------------------;
3545	hidnplayr	1074	align 4
6011	hidnplayr	1075	ipv4_api:
3545	hidnplayr	1076
		1077	movzx eax, bh
		1078	shl eax, 2
		1079
		1080	and ebx, 0x000000ff
		1081	cmp ebx, .number
		1082	ja .error
		1083	jmp dword [.table + 4*ebx]
		1084
		1085	.table:
		1086	dd .packets_tx ; 0
		1087	dd .packets_rx ; 1
		1088	dd .read_ip ; 2
		1089	dd .write_ip ; 3
		1090	dd .read_dns ; 4
		1091	dd .write_dns ; 5
		1092	dd .read_subnet ; 6
		1093	dd .write_subnet ; 7
		1094	dd .read_gateway ; 8
		1095	dd .write_gateway ; 9
		1096	.number = ($ - .table) / 4 - 1
		1097
		1098	.error:
		1099	mov eax, -1
		1100	ret
		1101
		1102	.packets_tx:
4052	hidnplayr	1103	mov eax, [IPv4_packets_tx + eax]
3545	hidnplayr	1104	ret
		1105
		1106	.packets_rx:
4052	hidnplayr	1107	mov eax, [IPv4_packets_rx + eax]
3545	hidnplayr	1108	ret
		1109
		1110	.read_ip:
7678	hidnplayr	1111	mov eax, [IPv4_address + eax]
3545	hidnplayr	1112	ret
		1113
		1114	.write_ip:
7678	hidnplayr	1115	mov [IPv4_address + eax], ecx
3545	hidnplayr	1116	mov edi, eax ; device number, we'll need it for ARP
		1117
		1118	; pre-calculate the local broadcast address
7678	hidnplayr	1119	mov ebx, [IPv4_subnet + eax]
3545	hidnplayr	1120	not ebx
		1121	or ebx, ecx
7678	hidnplayr	1122	mov [IPv4_broadcast + eax], ebx
3545	hidnplayr	1123
7679	hidnplayr	1124	mov ebx, [net_device_list + eax]
7678	hidnplayr	1125	mov eax, [IPv4_address + eax]
6011	hidnplayr	1126	call arp_output_request ; now send a gratuitous ARP
3545	hidnplayr	1127
6011	hidnplayr	1128	call net_send_event
3545	hidnplayr	1129	xor eax, eax
		1130	ret
		1131
		1132	.read_dns:
7678	hidnplayr	1133	mov eax, [IPv4_nameserver + eax]
3545	hidnplayr	1134	ret
		1135
		1136	.write_dns:
7678	hidnplayr	1137	mov [IPv4_nameserver + eax], ecx
6011	hidnplayr	1138	call net_send_event
3545	hidnplayr	1139	xor eax, eax
		1140	ret
		1141
		1142	.read_subnet:
7678	hidnplayr	1143	mov eax, [IPv4_subnet + eax]
3545	hidnplayr	1144	ret
		1145
		1146	.write_subnet:
7678	hidnplayr	1147	mov [IPv4_subnet + eax], ecx
3545	hidnplayr	1148
		1149	; pre-calculate the local broadcast address
7678	hidnplayr	1150	mov ebx, [IPv4_address + eax]
3545	hidnplayr	1151	not ecx
		1152	or ecx, ebx
7678	hidnplayr	1153	mov [IPv4_broadcast + eax], ecx
3545	hidnplayr	1154
6011	hidnplayr	1155	call net_send_event
3545	hidnplayr	1156	xor eax, eax
		1157	ret
		1158
		1159	.read_gateway:
7678	hidnplayr	1160	mov eax, [IPv4_gateway + eax]
3545	hidnplayr	1161	ret
		1162
		1163	.write_gateway:
7678	hidnplayr	1164	mov [IPv4_gateway + eax], ecx
3545	hidnplayr	1165
6011	hidnplayr	1166	call net_send_event
3545	hidnplayr	1167	xor eax, eax
9799	Boppan	1168	ret

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(root)/kernel/trunk/network/IPv4.inc @ 9809 – Rev 9806